Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NET3 Protocol independent device support routines. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Derived from the non IP parts of dev.c 1.0.19 |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 12 | * Mark Evans, <evansmp@uhura.aston.ac.uk> |
| 13 | * |
| 14 | * Additional Authors: |
| 15 | * Florian la Roche <rzsfl@rz.uni-sb.de> |
| 16 | * Alan Cox <gw4pts@gw4pts.ampr.org> |
| 17 | * David Hinds <dahinds@users.sourceforge.net> |
| 18 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
| 19 | * Adam Sulmicki <adam@cfar.umd.edu> |
| 20 | * Pekka Riikonen <priikone@poesidon.pspt.fi> |
| 21 | * |
| 22 | * Changes: |
| 23 | * D.J. Barrow : Fixed bug where dev->refcnt gets set |
| 24 | * to 2 if register_netdev gets called |
| 25 | * before net_dev_init & also removed a |
| 26 | * few lines of code in the process. |
| 27 | * Alan Cox : device private ioctl copies fields back. |
| 28 | * Alan Cox : Transmit queue code does relevant |
| 29 | * stunts to keep the queue safe. |
| 30 | * Alan Cox : Fixed double lock. |
| 31 | * Alan Cox : Fixed promisc NULL pointer trap |
| 32 | * ???????? : Support the full private ioctl range |
| 33 | * Alan Cox : Moved ioctl permission check into |
| 34 | * drivers |
| 35 | * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI |
| 36 | * Alan Cox : 100 backlog just doesn't cut it when |
| 37 | * you start doing multicast video 8) |
| 38 | * Alan Cox : Rewrote net_bh and list manager. |
| 39 | * Alan Cox : Fix ETH_P_ALL echoback lengths. |
| 40 | * Alan Cox : Took out transmit every packet pass |
| 41 | * Saved a few bytes in the ioctl handler |
| 42 | * Alan Cox : Network driver sets packet type before |
| 43 | * calling netif_rx. Saves a function |
| 44 | * call a packet. |
| 45 | * Alan Cox : Hashed net_bh() |
| 46 | * Richard Kooijman: Timestamp fixes. |
| 47 | * Alan Cox : Wrong field in SIOCGIFDSTADDR |
| 48 | * Alan Cox : Device lock protection. |
| 49 | * Alan Cox : Fixed nasty side effect of device close |
| 50 | * changes. |
| 51 | * Rudi Cilibrasi : Pass the right thing to |
| 52 | * set_mac_address() |
| 53 | * Dave Miller : 32bit quantity for the device lock to |
| 54 | * make it work out on a Sparc. |
| 55 | * Bjorn Ekwall : Added KERNELD hack. |
| 56 | * Alan Cox : Cleaned up the backlog initialise. |
| 57 | * Craig Metz : SIOCGIFCONF fix if space for under |
| 58 | * 1 device. |
| 59 | * Thomas Bogendoerfer : Return ENODEV for dev_open, if there |
| 60 | * is no device open function. |
| 61 | * Andi Kleen : Fix error reporting for SIOCGIFCONF |
| 62 | * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF |
| 63 | * Cyrus Durgin : Cleaned for KMOD |
| 64 | * Adam Sulmicki : Bug Fix : Network Device Unload |
| 65 | * A network device unload needs to purge |
| 66 | * the backlog queue. |
| 67 | * Paul Rusty Russell : SIOCSIFNAME |
| 68 | * Pekka Riikonen : Netdev boot-time settings code |
| 69 | * Andrew Morton : Make unregister_netdevice wait |
| 70 | * indefinitely on dev->refcnt |
| 71 | * J Hadi Salim : - Backlog queue sampling |
| 72 | * - netif_rx() feedback |
| 73 | */ |
| 74 | |
| 75 | #include <asm/uaccess.h> |
| 76 | #include <asm/system.h> |
| 77 | #include <linux/bitops.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 78 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | #include <linux/cpu.h> |
| 80 | #include <linux/types.h> |
| 81 | #include <linux/kernel.h> |
stephen hemminger | 08e9897 | 2009-11-10 07:20:34 +0000 | [diff] [blame] | 82 | #include <linux/hash.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 83 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #include <linux/sched.h> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 85 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #include <linux/string.h> |
| 87 | #include <linux/mm.h> |
| 88 | #include <linux/socket.h> |
| 89 | #include <linux/sockios.h> |
| 90 | #include <linux/errno.h> |
| 91 | #include <linux/interrupt.h> |
| 92 | #include <linux/if_ether.h> |
| 93 | #include <linux/netdevice.h> |
| 94 | #include <linux/etherdevice.h> |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 95 | #include <linux/ethtool.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #include <linux/notifier.h> |
| 97 | #include <linux/skbuff.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 98 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | #include <net/sock.h> |
| 100 | #include <linux/rtnetlink.h> |
| 101 | #include <linux/proc_fs.h> |
| 102 | #include <linux/seq_file.h> |
| 103 | #include <linux/stat.h> |
| 104 | #include <linux/if_bridge.h> |
Patrick McHardy | b863ceb | 2007-07-14 18:55:06 -0700 | [diff] [blame] | 105 | #include <linux/if_macvlan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | #include <net/dst.h> |
| 107 | #include <net/pkt_sched.h> |
| 108 | #include <net/checksum.h> |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 109 | #include <net/xfrm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | #include <linux/highmem.h> |
| 111 | #include <linux/init.h> |
| 112 | #include <linux/kmod.h> |
| 113 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | #include <linux/netpoll.h> |
| 115 | #include <linux/rcupdate.h> |
| 116 | #include <linux/delay.h> |
Johannes Berg | 295f4a1 | 2007-04-26 20:43:56 -0700 | [diff] [blame] | 117 | #include <net/wext.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | #include <net/iw_handler.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | #include <asm/current.h> |
Steve Grubb | 5bdb988 | 2005-12-03 08:39:35 -0500 | [diff] [blame] | 120 | #include <linux/audit.h> |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 121 | #include <linux/dmaengine.h> |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 122 | #include <linux/err.h> |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 123 | #include <linux/ctype.h> |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 124 | #include <linux/if_arp.h> |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 125 | #include <linux/if_vlan.h> |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 126 | #include <linux/ip.h> |
Alexander Duyck | ad55dca | 2008-09-20 22:05:50 -0700 | [diff] [blame] | 127 | #include <net/ip.h> |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 128 | #include <linux/ipv6.h> |
| 129 | #include <linux/in.h> |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 130 | #include <linux/jhash.h> |
| 131 | #include <linux/random.h> |
David S. Miller | 9cbc1cb | 2009-06-15 03:02:23 -0700 | [diff] [blame] | 132 | #include <trace/events/napi.h> |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 133 | #include <linux/pci.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Pavel Emelyanov | 342709e | 2007-10-23 21:14:45 -0700 | [diff] [blame] | 135 | #include "net-sysfs.h" |
| 136 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 137 | /* Instead of increasing this, you should create a hash table. */ |
| 138 | #define MAX_GRO_SKBS 8 |
| 139 | |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 140 | /* This should be increased if a protocol with a bigger head is added. */ |
| 141 | #define GRO_MAX_HEAD (MAX_HEADER + 128) |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | /* |
| 144 | * The list of packet types we will receive (as opposed to discard) |
| 145 | * and the routines to invoke. |
| 146 | * |
| 147 | * Why 16. Because with 16 the only overlap we get on a hash of the |
| 148 | * low nibble of the protocol value is RARP/SNAP/X.25. |
| 149 | * |
| 150 | * NOTE: That is no longer true with the addition of VLAN tags. Not |
| 151 | * sure which should go first, but I bet it won't make much |
| 152 | * difference if we are running VLANs. The good news is that |
| 153 | * this protocol won't be in the list unless compiled in, so |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 154 | * the average user (w/out VLANs) will not be adversely affected. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | * --BLG |
| 156 | * |
| 157 | * 0800 IP |
| 158 | * 8100 802.1Q VLAN |
| 159 | * 0001 802.3 |
| 160 | * 0002 AX.25 |
| 161 | * 0004 802.2 |
| 162 | * 8035 RARP |
| 163 | * 0005 SNAP |
| 164 | * 0805 X.25 |
| 165 | * 0806 ARP |
| 166 | * 8137 IPX |
| 167 | * 0009 Localtalk |
| 168 | * 86DD IPv6 |
| 169 | */ |
| 170 | |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 171 | #define PTYPE_HASH_SIZE (16) |
| 172 | #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) |
| 173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | static DEFINE_SPINLOCK(ptype_lock); |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 175 | static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 176 | static struct list_head ptype_all __read_mostly; /* Taps */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | /* |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 179 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | * semaphore. |
| 181 | * |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 182 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | * |
| 184 | * Writers must hold the rtnl semaphore while they loop through the |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 185 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | * actual updates. This allows pure readers to access the list even |
| 187 | * while a writer is preparing to update it. |
| 188 | * |
| 189 | * To put it another way, dev_base_lock is held for writing only to |
| 190 | * protect against pure readers; the rtnl semaphore provides the |
| 191 | * protection against other writers. |
| 192 | * |
| 193 | * See, for example usages, register_netdevice() and |
| 194 | * unregister_netdevice(), which must be called with the rtnl |
| 195 | * semaphore held. |
| 196 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | DEFINE_RWLOCK(dev_base_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | EXPORT_SYMBOL(dev_base_lock); |
| 199 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 200 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | { |
| 202 | unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); |
stephen hemminger | 08e9897 | 2009-11-10 07:20:34 +0000 | [diff] [blame] | 203 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
| 205 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 206 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | { |
Eric Dumazet | 7c28bd0 | 2009-10-24 06:13:17 -0700 | [diff] [blame] | 208 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | } |
| 210 | |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 211 | static inline void rps_lock(struct softnet_data *queue) |
| 212 | { |
| 213 | #ifdef CONFIG_RPS |
| 214 | spin_lock(&queue->input_pkt_queue.lock); |
| 215 | #endif |
| 216 | } |
| 217 | |
| 218 | static inline void rps_unlock(struct softnet_data *queue) |
| 219 | { |
| 220 | #ifdef CONFIG_RPS |
| 221 | spin_unlock(&queue->input_pkt_queue.lock); |
| 222 | #endif |
| 223 | } |
| 224 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 225 | /* Device list insertion */ |
| 226 | static int list_netdevice(struct net_device *dev) |
| 227 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 228 | struct net *net = dev_net(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 229 | |
| 230 | ASSERT_RTNL(); |
| 231 | |
| 232 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 233 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 234 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 235 | hlist_add_head_rcu(&dev->index_hlist, |
| 236 | dev_index_hash(net, dev->ifindex)); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 237 | write_unlock_bh(&dev_base_lock); |
| 238 | return 0; |
| 239 | } |
| 240 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 241 | /* Device list removal |
| 242 | * caller must respect a RCU grace period before freeing/reusing dev |
| 243 | */ |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 244 | static void unlist_netdevice(struct net_device *dev) |
| 245 | { |
| 246 | ASSERT_RTNL(); |
| 247 | |
| 248 | /* Unlink dev from the device chain */ |
| 249 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 250 | list_del_rcu(&dev->dev_list); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 251 | hlist_del_rcu(&dev->name_hlist); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 252 | hlist_del_rcu(&dev->index_hlist); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 253 | write_unlock_bh(&dev_base_lock); |
| 254 | } |
| 255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | /* |
| 257 | * Our notifier list |
| 258 | */ |
| 259 | |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 260 | static RAW_NOTIFIER_HEAD(netdev_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | /* |
| 263 | * Device drivers call our routines to queue packets here. We empty the |
| 264 | * queue in the local softnet handler. |
| 265 | */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 266 | |
| 267 | DEFINE_PER_CPU(struct softnet_data, softnet_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 268 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 270 | #ifdef CONFIG_LOCKDEP |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 271 | /* |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 272 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 273 | * according to dev->type |
| 274 | */ |
| 275 | static const unsigned short netdev_lock_type[] = |
| 276 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, |
| 277 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, |
| 278 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, |
| 279 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, |
| 280 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, |
| 281 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, |
| 282 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, |
| 283 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, |
| 284 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, |
| 285 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, |
| 286 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, |
| 287 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, |
| 288 | ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211, |
Rémi Denis-Courmont | 2d91d78 | 2008-12-17 15:47:29 -0800 | [diff] [blame] | 289 | ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, |
Dmitry Eremin-Solenikov | 929122cd | 2009-08-14 20:00:20 +0400 | [diff] [blame] | 290 | ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154, |
Sergey Lapin | fcb94e4 | 2009-06-08 12:18:47 +0000 | [diff] [blame] | 291 | ARPHRD_VOID, ARPHRD_NONE}; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 292 | |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 293 | static const char *const netdev_lock_name[] = |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 294 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
| 295 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", |
| 296 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", |
| 297 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", |
| 298 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", |
| 299 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", |
| 300 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", |
| 301 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", |
| 302 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", |
| 303 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", |
| 304 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", |
| 305 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", |
| 306 | "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211", |
Rémi Denis-Courmont | 2d91d78 | 2008-12-17 15:47:29 -0800 | [diff] [blame] | 307 | "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", |
Dmitry Eremin-Solenikov | 929122cd | 2009-08-14 20:00:20 +0400 | [diff] [blame] | 308 | "_xmit_PHONET_PIPE", "_xmit_IEEE802154", |
Sergey Lapin | fcb94e4 | 2009-06-08 12:18:47 +0000 | [diff] [blame] | 309 | "_xmit_VOID", "_xmit_NONE"}; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 310 | |
| 311 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 312 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 313 | |
| 314 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) |
| 315 | { |
| 316 | int i; |
| 317 | |
| 318 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) |
| 319 | if (netdev_lock_type[i] == dev_type) |
| 320 | return i; |
| 321 | /* the last key is used by default */ |
| 322 | return ARRAY_SIZE(netdev_lock_type) - 1; |
| 323 | } |
| 324 | |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 325 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
| 326 | unsigned short dev_type) |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 327 | { |
| 328 | int i; |
| 329 | |
| 330 | i = netdev_lock_pos(dev_type); |
| 331 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], |
| 332 | netdev_lock_name[i]); |
| 333 | } |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 334 | |
| 335 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
| 336 | { |
| 337 | int i; |
| 338 | |
| 339 | i = netdev_lock_pos(dev->type); |
| 340 | lockdep_set_class_and_name(&dev->addr_list_lock, |
| 341 | &netdev_addr_lock_key[i], |
| 342 | netdev_lock_name[i]); |
| 343 | } |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 344 | #else |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 345 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
| 346 | unsigned short dev_type) |
| 347 | { |
| 348 | } |
| 349 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 350 | { |
| 351 | } |
| 352 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | /******************************************************************************* |
| 355 | |
| 356 | Protocol management and registration routines |
| 357 | |
| 358 | *******************************************************************************/ |
| 359 | |
| 360 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | * Add a protocol ID to the list. Now that the input handler is |
| 362 | * smarter we can dispense with all the messy stuff that used to be |
| 363 | * here. |
| 364 | * |
| 365 | * BEWARE!!! Protocol handlers, mangling input packets, |
| 366 | * MUST BE last in hash buckets and checking protocol handlers |
| 367 | * MUST start from promiscuous ptype_all chain in net_bh. |
| 368 | * It is true now, do not change it. |
| 369 | * Explanation follows: if protocol handler, mangling packet, will |
| 370 | * be the first on list, it is not able to sense, that packet |
| 371 | * is cloned and should be copied-on-write, so that it will |
| 372 | * change it and subsequent readers will get broken packet. |
| 373 | * --ANK (980803) |
| 374 | */ |
| 375 | |
| 376 | /** |
| 377 | * dev_add_pack - add packet handler |
| 378 | * @pt: packet type declaration |
| 379 | * |
| 380 | * Add a protocol handler to the networking stack. The passed &packet_type |
| 381 | * is linked into kernel lists and may not be freed until it has been |
| 382 | * removed from the kernel lists. |
| 383 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 384 | * This call does not sleep therefore it can not |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | * guarantee all CPU's that are in middle of receiving packets |
| 386 | * will see the new packet type (until the next received packet). |
| 387 | */ |
| 388 | |
| 389 | void dev_add_pack(struct packet_type *pt) |
| 390 | { |
| 391 | int hash; |
| 392 | |
| 393 | spin_lock_bh(&ptype_lock); |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 394 | if (pt->type == htons(ETH_P_ALL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | list_add_rcu(&pt->list, &ptype_all); |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 396 | else { |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 397 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | list_add_rcu(&pt->list, &ptype_base[hash]); |
| 399 | } |
| 400 | spin_unlock_bh(&ptype_lock); |
| 401 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 402 | EXPORT_SYMBOL(dev_add_pack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | /** |
| 405 | * __dev_remove_pack - remove packet handler |
| 406 | * @pt: packet type declaration |
| 407 | * |
| 408 | * Remove a protocol handler that was previously added to the kernel |
| 409 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed |
| 410 | * from the kernel lists and can be freed or reused once this function |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 411 | * returns. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | * |
| 413 | * The packet type might still be in use by receivers |
| 414 | * and must not be freed until after all the CPU's have gone |
| 415 | * through a quiescent state. |
| 416 | */ |
| 417 | void __dev_remove_pack(struct packet_type *pt) |
| 418 | { |
| 419 | struct list_head *head; |
| 420 | struct packet_type *pt1; |
| 421 | |
| 422 | spin_lock_bh(&ptype_lock); |
| 423 | |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 424 | if (pt->type == htons(ETH_P_ALL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | head = &ptype_all; |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 426 | else |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 427 | head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
| 429 | list_for_each_entry(pt1, head, list) { |
| 430 | if (pt == pt1) { |
| 431 | list_del_rcu(&pt->list); |
| 432 | goto out; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt); |
| 437 | out: |
| 438 | spin_unlock_bh(&ptype_lock); |
| 439 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 440 | EXPORT_SYMBOL(__dev_remove_pack); |
| 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | /** |
| 443 | * dev_remove_pack - remove packet handler |
| 444 | * @pt: packet type declaration |
| 445 | * |
| 446 | * Remove a protocol handler that was previously added to the kernel |
| 447 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed |
| 448 | * from the kernel lists and can be freed or reused once this function |
| 449 | * returns. |
| 450 | * |
| 451 | * This call sleeps to guarantee that no CPU is looking at the packet |
| 452 | * type after return. |
| 453 | */ |
| 454 | void dev_remove_pack(struct packet_type *pt) |
| 455 | { |
| 456 | __dev_remove_pack(pt); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | synchronize_net(); |
| 459 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 460 | EXPORT_SYMBOL(dev_remove_pack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
| 462 | /****************************************************************************** |
| 463 | |
| 464 | Device Boot-time Settings Routines |
| 465 | |
| 466 | *******************************************************************************/ |
| 467 | |
| 468 | /* Boot time configuration table */ |
| 469 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; |
| 470 | |
| 471 | /** |
| 472 | * netdev_boot_setup_add - add new setup entry |
| 473 | * @name: name of the device |
| 474 | * @map: configured settings for the device |
| 475 | * |
| 476 | * Adds new setup entry to the dev_boot_setup list. The function |
| 477 | * returns 0 on error and 1 on success. This is a generic routine to |
| 478 | * all netdevices. |
| 479 | */ |
| 480 | static int netdev_boot_setup_add(char *name, struct ifmap *map) |
| 481 | { |
| 482 | struct netdev_boot_setup *s; |
| 483 | int i; |
| 484 | |
| 485 | s = dev_boot_setup; |
| 486 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { |
| 487 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { |
| 488 | memset(s[i].name, 0, sizeof(s[i].name)); |
Wang Chen | 93b3cff | 2008-07-01 19:57:19 -0700 | [diff] [blame] | 489 | strlcpy(s[i].name, name, IFNAMSIZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
| 491 | break; |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; |
| 496 | } |
| 497 | |
| 498 | /** |
| 499 | * netdev_boot_setup_check - check boot time settings |
| 500 | * @dev: the netdevice |
| 501 | * |
| 502 | * Check boot time settings for the device. |
| 503 | * The found settings are set for the device to be used |
| 504 | * later in the device probing. |
| 505 | * Returns 0 if no settings found, 1 if they are. |
| 506 | */ |
| 507 | int netdev_boot_setup_check(struct net_device *dev) |
| 508 | { |
| 509 | struct netdev_boot_setup *s = dev_boot_setup; |
| 510 | int i; |
| 511 | |
| 512 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { |
| 513 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && |
Wang Chen | 93b3cff | 2008-07-01 19:57:19 -0700 | [diff] [blame] | 514 | !strcmp(dev->name, s[i].name)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | dev->irq = s[i].map.irq; |
| 516 | dev->base_addr = s[i].map.base_addr; |
| 517 | dev->mem_start = s[i].map.mem_start; |
| 518 | dev->mem_end = s[i].map.mem_end; |
| 519 | return 1; |
| 520 | } |
| 521 | } |
| 522 | return 0; |
| 523 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 524 | EXPORT_SYMBOL(netdev_boot_setup_check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
| 526 | |
| 527 | /** |
| 528 | * netdev_boot_base - get address from boot time settings |
| 529 | * @prefix: prefix for network device |
| 530 | * @unit: id for network device |
| 531 | * |
| 532 | * Check boot time settings for the base address of device. |
| 533 | * The found settings are set for the device to be used |
| 534 | * later in the device probing. |
| 535 | * Returns 0 if no settings found. |
| 536 | */ |
| 537 | unsigned long netdev_boot_base(const char *prefix, int unit) |
| 538 | { |
| 539 | const struct netdev_boot_setup *s = dev_boot_setup; |
| 540 | char name[IFNAMSIZ]; |
| 541 | int i; |
| 542 | |
| 543 | sprintf(name, "%s%d", prefix, unit); |
| 544 | |
| 545 | /* |
| 546 | * If device already registered then return base of 1 |
| 547 | * to indicate not to probe for this interface |
| 548 | */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 549 | if (__dev_get_by_name(&init_net, name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | return 1; |
| 551 | |
| 552 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) |
| 553 | if (!strcmp(name, s[i].name)) |
| 554 | return s[i].map.base_addr; |
| 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * Saves at boot time configured settings for any netdevice. |
| 560 | */ |
| 561 | int __init netdev_boot_setup(char *str) |
| 562 | { |
| 563 | int ints[5]; |
| 564 | struct ifmap map; |
| 565 | |
| 566 | str = get_options(str, ARRAY_SIZE(ints), ints); |
| 567 | if (!str || !*str) |
| 568 | return 0; |
| 569 | |
| 570 | /* Save settings */ |
| 571 | memset(&map, 0, sizeof(map)); |
| 572 | if (ints[0] > 0) |
| 573 | map.irq = ints[1]; |
| 574 | if (ints[0] > 1) |
| 575 | map.base_addr = ints[2]; |
| 576 | if (ints[0] > 2) |
| 577 | map.mem_start = ints[3]; |
| 578 | if (ints[0] > 3) |
| 579 | map.mem_end = ints[4]; |
| 580 | |
| 581 | /* Add new entry to the list */ |
| 582 | return netdev_boot_setup_add(str, &map); |
| 583 | } |
| 584 | |
| 585 | __setup("netdev=", netdev_boot_setup); |
| 586 | |
| 587 | /******************************************************************************* |
| 588 | |
| 589 | Device Interface Subroutines |
| 590 | |
| 591 | *******************************************************************************/ |
| 592 | |
| 593 | /** |
| 594 | * __dev_get_by_name - find a device by its name |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 595 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | * @name: name to find |
| 597 | * |
| 598 | * Find an interface by name. Must be called under RTNL semaphore |
| 599 | * or @dev_base_lock. If the name is found a pointer to the device |
| 600 | * is returned. If the name is not found then %NULL is returned. The |
| 601 | * reference counters are not incremented so the caller must be |
| 602 | * careful with locks. |
| 603 | */ |
| 604 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 605 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | { |
| 607 | struct hlist_node *p; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 608 | struct net_device *dev; |
| 609 | struct hlist_head *head = dev_name_hash(net, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 611 | hlist_for_each_entry(dev, p, head, name_hlist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
| 613 | return dev; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | return NULL; |
| 616 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 617 | EXPORT_SYMBOL(__dev_get_by_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
| 619 | /** |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 620 | * dev_get_by_name_rcu - find a device by its name |
| 621 | * @net: the applicable net namespace |
| 622 | * @name: name to find |
| 623 | * |
| 624 | * Find an interface by name. |
| 625 | * If the name is found a pointer to the device is returned. |
| 626 | * If the name is not found then %NULL is returned. |
| 627 | * The reference counters are not incremented so the caller must be |
| 628 | * careful with locks. The caller must hold RCU lock. |
| 629 | */ |
| 630 | |
| 631 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) |
| 632 | { |
| 633 | struct hlist_node *p; |
| 634 | struct net_device *dev; |
| 635 | struct hlist_head *head = dev_name_hash(net, name); |
| 636 | |
| 637 | hlist_for_each_entry_rcu(dev, p, head, name_hlist) |
| 638 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
| 639 | return dev; |
| 640 | |
| 641 | return NULL; |
| 642 | } |
| 643 | EXPORT_SYMBOL(dev_get_by_name_rcu); |
| 644 | |
| 645 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | * dev_get_by_name - find a device by its name |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 647 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | * @name: name to find |
| 649 | * |
| 650 | * Find an interface by name. This can be called from any |
| 651 | * context and does its own locking. The returned handle has |
| 652 | * the usage count incremented and the caller must use dev_put() to |
| 653 | * release it when it is no longer needed. %NULL is returned if no |
| 654 | * matching device is found. |
| 655 | */ |
| 656 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 657 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | { |
| 659 | struct net_device *dev; |
| 660 | |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 661 | rcu_read_lock(); |
| 662 | dev = dev_get_by_name_rcu(net, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | if (dev) |
| 664 | dev_hold(dev); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 665 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | return dev; |
| 667 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 668 | EXPORT_SYMBOL(dev_get_by_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
| 670 | /** |
| 671 | * __dev_get_by_index - find a device by its ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 672 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | * @ifindex: index of device |
| 674 | * |
| 675 | * Search for an interface by index. Returns %NULL if the device |
| 676 | * is not found or a pointer to the device. The device has not |
| 677 | * had its reference counter increased so the caller must be careful |
| 678 | * about locking. The caller must hold either the RTNL semaphore |
| 679 | * or @dev_base_lock. |
| 680 | */ |
| 681 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 682 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | { |
| 684 | struct hlist_node *p; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 685 | struct net_device *dev; |
| 686 | struct hlist_head *head = dev_index_hash(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 688 | hlist_for_each_entry(dev, p, head, index_hlist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | if (dev->ifindex == ifindex) |
| 690 | return dev; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 691 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | return NULL; |
| 693 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 694 | EXPORT_SYMBOL(__dev_get_by_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 696 | /** |
| 697 | * dev_get_by_index_rcu - find a device by its ifindex |
| 698 | * @net: the applicable net namespace |
| 699 | * @ifindex: index of device |
| 700 | * |
| 701 | * Search for an interface by index. Returns %NULL if the device |
| 702 | * is not found or a pointer to the device. The device has not |
| 703 | * had its reference counter increased so the caller must be careful |
| 704 | * about locking. The caller must hold RCU lock. |
| 705 | */ |
| 706 | |
| 707 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) |
| 708 | { |
| 709 | struct hlist_node *p; |
| 710 | struct net_device *dev; |
| 711 | struct hlist_head *head = dev_index_hash(net, ifindex); |
| 712 | |
| 713 | hlist_for_each_entry_rcu(dev, p, head, index_hlist) |
| 714 | if (dev->ifindex == ifindex) |
| 715 | return dev; |
| 716 | |
| 717 | return NULL; |
| 718 | } |
| 719 | EXPORT_SYMBOL(dev_get_by_index_rcu); |
| 720 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
| 722 | /** |
| 723 | * dev_get_by_index - find a device by its ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 724 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | * @ifindex: index of device |
| 726 | * |
| 727 | * Search for an interface by index. Returns NULL if the device |
| 728 | * is not found or a pointer to the device. The device returned has |
| 729 | * had a reference added and the pointer is safe until the user calls |
| 730 | * dev_put to indicate they have finished with it. |
| 731 | */ |
| 732 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 733 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | { |
| 735 | struct net_device *dev; |
| 736 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 737 | rcu_read_lock(); |
| 738 | dev = dev_get_by_index_rcu(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | if (dev) |
| 740 | dev_hold(dev); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 741 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | return dev; |
| 743 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 744 | EXPORT_SYMBOL(dev_get_by_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
| 746 | /** |
| 747 | * dev_getbyhwaddr - find a device by its hardware address |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 748 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | * @type: media type of device |
| 750 | * @ha: hardware address |
| 751 | * |
| 752 | * Search for an interface by MAC address. Returns NULL if the device |
| 753 | * is not found or a pointer to the device. The caller must hold the |
| 754 | * rtnl semaphore. The returned device has not had its ref count increased |
| 755 | * and the caller must therefore be careful about locking |
| 756 | * |
| 757 | * BUGS: |
| 758 | * If the API was consistent this would be __dev_get_by_hwaddr |
| 759 | */ |
| 760 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 761 | struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | { |
| 763 | struct net_device *dev; |
| 764 | |
| 765 | ASSERT_RTNL(); |
| 766 | |
Denis V. Lunev | 81103a5 | 2007-12-12 10:47:38 -0800 | [diff] [blame] | 767 | for_each_netdev(net, dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | if (dev->type == type && |
| 769 | !memcmp(dev->dev_addr, ha, dev->addr_len)) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 770 | return dev; |
| 771 | |
| 772 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | } |
Jochen Friedrich | cf309e3 | 2005-09-22 04:44:55 -0300 | [diff] [blame] | 774 | EXPORT_SYMBOL(dev_getbyhwaddr); |
| 775 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 776 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 777 | { |
| 778 | struct net_device *dev; |
| 779 | |
| 780 | ASSERT_RTNL(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 781 | for_each_netdev(net, dev) |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 782 | if (dev->type == type) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 783 | return dev; |
| 784 | |
| 785 | return NULL; |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 786 | } |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 787 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
| 788 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 789 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
Eric Dumazet | 99fe3c3 | 2010-03-18 11:27:25 +0000 | [diff] [blame] | 791 | struct net_device *dev, *ret = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
Eric Dumazet | 99fe3c3 | 2010-03-18 11:27:25 +0000 | [diff] [blame] | 793 | rcu_read_lock(); |
| 794 | for_each_netdev_rcu(net, dev) |
| 795 | if (dev->type == type) { |
| 796 | dev_hold(dev); |
| 797 | ret = dev; |
| 798 | break; |
| 799 | } |
| 800 | rcu_read_unlock(); |
| 801 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
| 804 | |
| 805 | /** |
| 806 | * dev_get_by_flags - find any device with given flags |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 807 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | * @if_flags: IFF_* values |
| 809 | * @mask: bitmask of bits in if_flags to check |
| 810 | * |
| 811 | * Search for any interface with the given flags. Returns NULL if a device |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 812 | * is not found or a pointer to the device. The device returned has |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | * had a reference added and the pointer is safe until the user calls |
| 814 | * dev_put to indicate they have finished with it. |
| 815 | */ |
| 816 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 817 | struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags, |
| 818 | unsigned short mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | { |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 820 | struct net_device *dev, *ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 822 | ret = NULL; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 823 | rcu_read_lock(); |
| 824 | for_each_netdev_rcu(net, dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | if (((dev->flags ^ if_flags) & mask) == 0) { |
| 826 | dev_hold(dev); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 827 | ret = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | break; |
| 829 | } |
| 830 | } |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 831 | rcu_read_unlock(); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 832 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 834 | EXPORT_SYMBOL(dev_get_by_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
| 836 | /** |
| 837 | * dev_valid_name - check if name is okay for network device |
| 838 | * @name: name string |
| 839 | * |
| 840 | * Network device names need to be valid file names to |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 841 | * to allow sysfs to work. We also disallow any kind of |
| 842 | * whitespace. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | */ |
Mitch Williams | c2373ee | 2005-11-09 10:34:45 -0800 | [diff] [blame] | 844 | int dev_valid_name(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | { |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 846 | if (*name == '\0') |
| 847 | return 0; |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 848 | if (strlen(name) >= IFNAMSIZ) |
| 849 | return 0; |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 850 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
| 851 | return 0; |
| 852 | |
| 853 | while (*name) { |
| 854 | if (*name == '/' || isspace(*name)) |
| 855 | return 0; |
| 856 | name++; |
| 857 | } |
| 858 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 860 | EXPORT_SYMBOL(dev_valid_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
| 862 | /** |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 863 | * __dev_alloc_name - allocate a name for a device |
| 864 | * @net: network namespace to allocate the device name in |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | * @name: name format string |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 866 | * @buf: scratch buffer and result name string |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | * |
| 868 | * Passed a format string - eg "lt%d" it will try and find a suitable |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 869 | * id. It scans list of devices to build up a free map, then chooses |
| 870 | * the first empty slot. The caller must hold the dev_base or rtnl lock |
| 871 | * while allocating the name and adding the device in order to avoid |
| 872 | * duplicates. |
| 873 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
| 874 | * Returns the number of the unit assigned or a negative errno code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | */ |
| 876 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 877 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | { |
| 879 | int i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | const char *p; |
| 881 | const int max_netdevices = 8*PAGE_SIZE; |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 882 | unsigned long *inuse; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | struct net_device *d; |
| 884 | |
| 885 | p = strnchr(name, IFNAMSIZ-1, '%'); |
| 886 | if (p) { |
| 887 | /* |
| 888 | * Verify the string as this thing may have come from |
| 889 | * the user. There must be either one "%d" and no other "%" |
| 890 | * characters. |
| 891 | */ |
| 892 | if (p[1] != 'd' || strchr(p + 2, '%')) |
| 893 | return -EINVAL; |
| 894 | |
| 895 | /* Use one page as a bit array of possible slots */ |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 896 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | if (!inuse) |
| 898 | return -ENOMEM; |
| 899 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 900 | for_each_netdev(net, d) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | if (!sscanf(d->name, name, &i)) |
| 902 | continue; |
| 903 | if (i < 0 || i >= max_netdevices) |
| 904 | continue; |
| 905 | |
| 906 | /* avoid cases where sscanf is not exact inverse of printf */ |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 907 | snprintf(buf, IFNAMSIZ, name, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
| 909 | set_bit(i, inuse); |
| 910 | } |
| 911 | |
| 912 | i = find_first_zero_bit(inuse, max_netdevices); |
| 913 | free_page((unsigned long) inuse); |
| 914 | } |
| 915 | |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 916 | if (buf != name) |
| 917 | snprintf(buf, IFNAMSIZ, name, i); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 918 | if (!__dev_get_by_name(net, buf)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | return i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
| 921 | /* It is possible to run out of possible slots |
| 922 | * when the name is long and there isn't enough space left |
| 923 | * for the digits, or if all bits are used. |
| 924 | */ |
| 925 | return -ENFILE; |
| 926 | } |
| 927 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 928 | /** |
| 929 | * dev_alloc_name - allocate a name for a device |
| 930 | * @dev: device |
| 931 | * @name: name format string |
| 932 | * |
| 933 | * Passed a format string - eg "lt%d" it will try and find a suitable |
| 934 | * id. It scans list of devices to build up a free map, then chooses |
| 935 | * the first empty slot. The caller must hold the dev_base or rtnl lock |
| 936 | * while allocating the name and adding the device in order to avoid |
| 937 | * duplicates. |
| 938 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
| 939 | * Returns the number of the unit assigned or a negative errno code. |
| 940 | */ |
| 941 | |
| 942 | int dev_alloc_name(struct net_device *dev, const char *name) |
| 943 | { |
| 944 | char buf[IFNAMSIZ]; |
| 945 | struct net *net; |
| 946 | int ret; |
| 947 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 948 | BUG_ON(!dev_net(dev)); |
| 949 | net = dev_net(dev); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 950 | ret = __dev_alloc_name(net, name, buf); |
| 951 | if (ret >= 0) |
| 952 | strlcpy(dev->name, buf, IFNAMSIZ); |
| 953 | return ret; |
| 954 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 955 | EXPORT_SYMBOL(dev_alloc_name); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 956 | |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 957 | static int dev_get_valid_name(struct net *net, const char *name, char *buf, |
| 958 | bool fmt) |
| 959 | { |
| 960 | if (!dev_valid_name(name)) |
| 961 | return -EINVAL; |
| 962 | |
| 963 | if (fmt && strchr(name, '%')) |
| 964 | return __dev_alloc_name(net, name, buf); |
| 965 | else if (__dev_get_by_name(net, name)) |
| 966 | return -EEXIST; |
| 967 | else if (buf != name) |
| 968 | strlcpy(buf, name, IFNAMSIZ); |
| 969 | |
| 970 | return 0; |
| 971 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
| 973 | /** |
| 974 | * dev_change_name - change name of a device |
| 975 | * @dev: device |
| 976 | * @newname: name (or format string) must be at least IFNAMSIZ |
| 977 | * |
| 978 | * Change name of a device, can pass format strings "eth%d". |
| 979 | * for wildcarding. |
| 980 | */ |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 981 | int dev_change_name(struct net_device *dev, const char *newname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | { |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 983 | char oldname[IFNAMSIZ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | int err = 0; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 985 | int ret; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 986 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | |
| 988 | ASSERT_RTNL(); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 989 | BUG_ON(!dev_net(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 991 | net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | if (dev->flags & IFF_UP) |
| 993 | return -EBUSY; |
| 994 | |
Stephen Hemminger | c8d90dc | 2007-10-26 03:53:42 -0700 | [diff] [blame] | 995 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) |
| 996 | return 0; |
| 997 | |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 998 | memcpy(oldname, dev->name, IFNAMSIZ); |
| 999 | |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 1000 | err = dev_get_valid_name(net, newname, dev->name, 1); |
| 1001 | if (err < 0) |
| 1002 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1004 | rollback: |
Eric W. Biederman | 3891845 | 2008-10-27 17:51:47 -0700 | [diff] [blame] | 1005 | /* For now only devices in the initial network namespace |
| 1006 | * are in sysfs. |
| 1007 | */ |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1008 | if (net_eq(net, &init_net)) { |
Eric W. Biederman | 3891845 | 2008-10-27 17:51:47 -0700 | [diff] [blame] | 1009 | ret = device_rename(&dev->dev, dev->name); |
| 1010 | if (ret) { |
| 1011 | memcpy(dev->name, oldname, IFNAMSIZ); |
| 1012 | return ret; |
| 1013 | } |
Stephen Hemminger | dcc9977 | 2008-05-14 22:33:38 -0700 | [diff] [blame] | 1014 | } |
Herbert Xu | 7f988ea | 2007-07-30 16:35:46 -0700 | [diff] [blame] | 1015 | |
| 1016 | write_lock_bh(&dev_base_lock); |
Eric W. Biederman | 9274982 | 2007-04-03 00:07:30 -0600 | [diff] [blame] | 1017 | hlist_del(&dev->name_hlist); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 1018 | write_unlock_bh(&dev_base_lock); |
| 1019 | |
| 1020 | synchronize_rcu(); |
| 1021 | |
| 1022 | write_lock_bh(&dev_base_lock); |
| 1023 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
Herbert Xu | 7f988ea | 2007-07-30 16:35:46 -0700 | [diff] [blame] | 1024 | write_unlock_bh(&dev_base_lock); |
| 1025 | |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1026 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1027 | ret = notifier_to_errno(ret); |
| 1028 | |
| 1029 | if (ret) { |
Eric Dumazet | 91e9c07b | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1030 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
| 1031 | if (err >= 0) { |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1032 | err = ret; |
| 1033 | memcpy(dev->name, oldname, IFNAMSIZ); |
| 1034 | goto rollback; |
Eric Dumazet | 91e9c07b | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1035 | } else { |
| 1036 | printk(KERN_ERR |
| 1037 | "%s: name change rollback failed: %d.\n", |
| 1038 | dev->name, ret); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1039 | } |
| 1040 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | |
| 1042 | return err; |
| 1043 | } |
| 1044 | |
| 1045 | /** |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1046 | * dev_set_alias - change ifalias of a device |
| 1047 | * @dev: device |
| 1048 | * @alias: name up to IFALIASZ |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 1049 | * @len: limit of bytes to copy from info |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1050 | * |
| 1051 | * Set ifalias for a device, |
| 1052 | */ |
| 1053 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) |
| 1054 | { |
| 1055 | ASSERT_RTNL(); |
| 1056 | |
| 1057 | if (len >= IFALIASZ) |
| 1058 | return -EINVAL; |
| 1059 | |
Oliver Hartkopp | 96ca4a2 | 2008-09-23 21:23:19 -0700 | [diff] [blame] | 1060 | if (!len) { |
| 1061 | if (dev->ifalias) { |
| 1062 | kfree(dev->ifalias); |
| 1063 | dev->ifalias = NULL; |
| 1064 | } |
| 1065 | return 0; |
| 1066 | } |
| 1067 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1068 | dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1069 | if (!dev->ifalias) |
| 1070 | return -ENOMEM; |
| 1071 | |
| 1072 | strlcpy(dev->ifalias, alias, len+1); |
| 1073 | return len; |
| 1074 | } |
| 1075 | |
| 1076 | |
| 1077 | /** |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 1078 | * netdev_features_change - device changes features |
Stephen Hemminger | d8a33ac | 2005-05-29 14:13:47 -0700 | [diff] [blame] | 1079 | * @dev: device to cause notification |
| 1080 | * |
| 1081 | * Called to indicate a device has changed features. |
| 1082 | */ |
| 1083 | void netdev_features_change(struct net_device *dev) |
| 1084 | { |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1085 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
Stephen Hemminger | d8a33ac | 2005-05-29 14:13:47 -0700 | [diff] [blame] | 1086 | } |
| 1087 | EXPORT_SYMBOL(netdev_features_change); |
| 1088 | |
| 1089 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | * netdev_state_change - device changes state |
| 1091 | * @dev: device to cause notification |
| 1092 | * |
| 1093 | * Called to indicate a device has changed state. This function calls |
| 1094 | * the notifier chains for netdev_chain and sends a NEWLINK message |
| 1095 | * to the routing socket. |
| 1096 | */ |
| 1097 | void netdev_state_change(struct net_device *dev) |
| 1098 | { |
| 1099 | if (dev->flags & IFF_UP) { |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1100 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
| 1102 | } |
| 1103 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1104 | EXPORT_SYMBOL(netdev_state_change); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | |
Jiri Pirko | 3ca5b40 | 2010-03-10 10:29:35 +0000 | [diff] [blame] | 1106 | int netdev_bonding_change(struct net_device *dev, unsigned long event) |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1107 | { |
Jiri Pirko | 3ca5b40 | 2010-03-10 10:29:35 +0000 | [diff] [blame] | 1108 | return call_netdevice_notifiers(event, dev); |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1109 | } |
| 1110 | EXPORT_SYMBOL(netdev_bonding_change); |
| 1111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | /** |
| 1113 | * dev_load - load a network module |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1114 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | * @name: name of interface |
| 1116 | * |
| 1117 | * If a network interface is not present and the process has suitable |
| 1118 | * privileges this function loads the module. If module loading is not |
| 1119 | * available in this kernel then it becomes a nop. |
| 1120 | */ |
| 1121 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1122 | void dev_load(struct net *net, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1124 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 1126 | rcu_read_lock(); |
| 1127 | dev = dev_get_by_name_rcu(net, name); |
| 1128 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | |
Eric Paris | a8f80e8 | 2009-08-13 09:44:51 -0400 | [diff] [blame] | 1130 | if (!dev && capable(CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | request_module("%s", name); |
| 1132 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1133 | EXPORT_SYMBOL(dev_load); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1135 | static int __dev_open(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1137 | const struct net_device_ops *ops = dev->netdev_ops; |
Johannes Berg | 3b8bcfd | 2009-05-30 01:39:53 +0200 | [diff] [blame] | 1138 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | |
Ben Hutchings | e46b66b | 2008-05-08 02:53:17 -0700 | [diff] [blame] | 1140 | ASSERT_RTNL(); |
| 1141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | * Is it even present? |
| 1144 | */ |
| 1145 | if (!netif_device_present(dev)) |
| 1146 | return -ENODEV; |
| 1147 | |
Johannes Berg | 3b8bcfd | 2009-05-30 01:39:53 +0200 | [diff] [blame] | 1148 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
| 1149 | ret = notifier_to_errno(ret); |
| 1150 | if (ret) |
| 1151 | return ret; |
| 1152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | /* |
| 1154 | * Call device private open method |
| 1155 | */ |
| 1156 | set_bit(__LINK_STATE_START, &dev->state); |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1157 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1158 | if (ops->ndo_validate_addr) |
| 1159 | ret = ops->ndo_validate_addr(dev); |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1160 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1161 | if (!ret && ops->ndo_open) |
| 1162 | ret = ops->ndo_open(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1164 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | * If it went open OK then: |
| 1166 | */ |
| 1167 | |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1168 | if (ret) |
| 1169 | clear_bit(__LINK_STATE_START, &dev->state); |
| 1170 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | /* |
| 1172 | * Set the flags. |
| 1173 | */ |
| 1174 | dev->flags |= IFF_UP; |
| 1175 | |
| 1176 | /* |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1177 | * Enable NET_DMA |
| 1178 | */ |
David S. Miller | b4bd07c | 2009-02-06 22:06:43 -0800 | [diff] [blame] | 1179 | net_dmaengine_get(); |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1180 | |
| 1181 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | * Initialize multicasting status |
| 1183 | */ |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 1184 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | |
| 1186 | /* |
| 1187 | * Wakeup transmit queue engine |
| 1188 | */ |
| 1189 | dev_activate(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | } |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1191 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | return ret; |
| 1193 | } |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1194 | |
| 1195 | /** |
| 1196 | * dev_open - prepare an interface for use. |
| 1197 | * @dev: device to open |
| 1198 | * |
| 1199 | * Takes a device from down to up state. The device's private open |
| 1200 | * function is invoked and then the multicast lists are loaded. Finally |
| 1201 | * the device is moved into the up state and a %NETDEV_UP message is |
| 1202 | * sent to the netdev notifier chain. |
| 1203 | * |
| 1204 | * Calling this function on an active interface is a nop. On a failure |
| 1205 | * a negative errno code is returned. |
| 1206 | */ |
| 1207 | int dev_open(struct net_device *dev) |
| 1208 | { |
| 1209 | int ret; |
| 1210 | |
| 1211 | /* |
| 1212 | * Is it already up? |
| 1213 | */ |
| 1214 | if (dev->flags & IFF_UP) |
| 1215 | return 0; |
| 1216 | |
| 1217 | /* |
| 1218 | * Open device |
| 1219 | */ |
| 1220 | ret = __dev_open(dev); |
| 1221 | if (ret < 0) |
| 1222 | return ret; |
| 1223 | |
| 1224 | /* |
| 1225 | * ... and announce new interface. |
| 1226 | */ |
| 1227 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); |
| 1228 | call_netdevice_notifiers(NETDEV_UP, dev); |
| 1229 | |
| 1230 | return ret; |
| 1231 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1232 | EXPORT_SYMBOL(dev_open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1234 | static int __dev_close(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1236 | const struct net_device_ops *ops = dev->netdev_ops; |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1237 | |
Ben Hutchings | e46b66b | 2008-05-08 02:53:17 -0700 | [diff] [blame] | 1238 | ASSERT_RTNL(); |
David S. Miller | 9d5010d | 2007-09-12 14:33:25 +0200 | [diff] [blame] | 1239 | might_sleep(); |
| 1240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | /* |
| 1242 | * Tell people we are going down, so that they can |
| 1243 | * prepare to death, when device is still operating. |
| 1244 | */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1245 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | clear_bit(__LINK_STATE_START, &dev->state); |
| 1248 | |
| 1249 | /* Synchronize to scheduled poll. We cannot touch poll list, |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1250 | * it can be even on different cpu. So just clear netif_running(). |
| 1251 | * |
| 1252 | * dev->stop() will invoke napi_disable() on all of it's |
| 1253 | * napi_struct instances on this device. |
| 1254 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | |
Matti Linnanvuori | d8b2a4d | 2008-02-12 23:10:11 -0800 | [diff] [blame] | 1257 | dev_deactivate(dev); |
| 1258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | /* |
| 1260 | * Call the device specific close. This cannot fail. |
| 1261 | * Only if device is UP |
| 1262 | * |
| 1263 | * We allow it to be called even after a DETACH hot-plug |
| 1264 | * event. |
| 1265 | */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1266 | if (ops->ndo_stop) |
| 1267 | ops->ndo_stop(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | |
| 1269 | /* |
| 1270 | * Device is now down. |
| 1271 | */ |
| 1272 | |
| 1273 | dev->flags &= ~IFF_UP; |
| 1274 | |
| 1275 | /* |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1276 | * Shutdown NET_DMA |
| 1277 | */ |
David S. Miller | b4bd07c | 2009-02-06 22:06:43 -0800 | [diff] [blame] | 1278 | net_dmaengine_put(); |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | return 0; |
| 1281 | } |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1282 | |
| 1283 | /** |
| 1284 | * dev_close - shutdown an interface. |
| 1285 | * @dev: device to shutdown |
| 1286 | * |
| 1287 | * This function moves an active device into down state. A |
| 1288 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device |
| 1289 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier |
| 1290 | * chain. |
| 1291 | */ |
| 1292 | int dev_close(struct net_device *dev) |
| 1293 | { |
| 1294 | if (!(dev->flags & IFF_UP)) |
| 1295 | return 0; |
| 1296 | |
| 1297 | __dev_close(dev); |
| 1298 | |
| 1299 | /* |
| 1300 | * Tell people we are down |
| 1301 | */ |
| 1302 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); |
| 1303 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
| 1304 | |
| 1305 | return 0; |
| 1306 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1307 | EXPORT_SYMBOL(dev_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | |
| 1309 | |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 1310 | /** |
| 1311 | * dev_disable_lro - disable Large Receive Offload on a device |
| 1312 | * @dev: device |
| 1313 | * |
| 1314 | * Disable Large Receive Offload (LRO) on a net device. Must be |
| 1315 | * called under RTNL. This is needed if received packets may be |
| 1316 | * forwarded to another interface. |
| 1317 | */ |
| 1318 | void dev_disable_lro(struct net_device *dev) |
| 1319 | { |
| 1320 | if (dev->ethtool_ops && dev->ethtool_ops->get_flags && |
| 1321 | dev->ethtool_ops->set_flags) { |
| 1322 | u32 flags = dev->ethtool_ops->get_flags(dev); |
| 1323 | if (flags & ETH_FLAG_LRO) { |
| 1324 | flags &= ~ETH_FLAG_LRO; |
| 1325 | dev->ethtool_ops->set_flags(dev, flags); |
| 1326 | } |
| 1327 | } |
| 1328 | WARN_ON(dev->features & NETIF_F_LRO); |
| 1329 | } |
| 1330 | EXPORT_SYMBOL(dev_disable_lro); |
| 1331 | |
| 1332 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1333 | static int dev_boot_phase = 1; |
| 1334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | /* |
| 1336 | * Device change register/unregister. These are not inline or static |
| 1337 | * as we export them to the world. |
| 1338 | */ |
| 1339 | |
| 1340 | /** |
| 1341 | * register_netdevice_notifier - register a network notifier block |
| 1342 | * @nb: notifier |
| 1343 | * |
| 1344 | * Register a notifier to be called when network device events occur. |
| 1345 | * The notifier passed is linked into the kernel structures and must |
| 1346 | * not be reused until it has been unregistered. A negative errno code |
| 1347 | * is returned on a failure. |
| 1348 | * |
| 1349 | * When registered all registration and up events are replayed |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1350 | * to the new notifier to allow device to have a race free |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | * view of the network device list. |
| 1352 | */ |
| 1353 | |
| 1354 | int register_netdevice_notifier(struct notifier_block *nb) |
| 1355 | { |
| 1356 | struct net_device *dev; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1357 | struct net_device *last; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1358 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | int err; |
| 1360 | |
| 1361 | rtnl_lock(); |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1362 | err = raw_notifier_chain_register(&netdev_chain, nb); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1363 | if (err) |
| 1364 | goto unlock; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1365 | if (dev_boot_phase) |
| 1366 | goto unlock; |
| 1367 | for_each_net(net) { |
| 1368 | for_each_netdev(net, dev) { |
| 1369 | err = nb->notifier_call(nb, NETDEV_REGISTER, dev); |
| 1370 | err = notifier_to_errno(err); |
| 1371 | if (err) |
| 1372 | goto rollback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1374 | if (!(dev->flags & IFF_UP)) |
| 1375 | continue; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1376 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1377 | nb->notifier_call(nb, NETDEV_UP, dev); |
| 1378 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | } |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1380 | |
| 1381 | unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | rtnl_unlock(); |
| 1383 | return err; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1384 | |
| 1385 | rollback: |
| 1386 | last = dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1387 | for_each_net(net) { |
| 1388 | for_each_netdev(net, dev) { |
| 1389 | if (dev == last) |
| 1390 | break; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1391 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1392 | if (dev->flags & IFF_UP) { |
| 1393 | nb->notifier_call(nb, NETDEV_GOING_DOWN, dev); |
| 1394 | nb->notifier_call(nb, NETDEV_DOWN, dev); |
| 1395 | } |
| 1396 | nb->notifier_call(nb, NETDEV_UNREGISTER, dev); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 1397 | nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1398 | } |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1399 | } |
Pavel Emelyanov | c67625a | 2007-11-14 15:53:16 -0800 | [diff] [blame] | 1400 | |
| 1401 | raw_notifier_chain_unregister(&netdev_chain, nb); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1402 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1404 | EXPORT_SYMBOL(register_netdevice_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | |
| 1406 | /** |
| 1407 | * unregister_netdevice_notifier - unregister a network notifier block |
| 1408 | * @nb: notifier |
| 1409 | * |
| 1410 | * Unregister a notifier previously registered by |
| 1411 | * register_netdevice_notifier(). The notifier is unlinked into the |
| 1412 | * kernel structures and may then be reused. A negative errno code |
| 1413 | * is returned on a failure. |
| 1414 | */ |
| 1415 | |
| 1416 | int unregister_netdevice_notifier(struct notifier_block *nb) |
| 1417 | { |
Herbert Xu | 9f51495 | 2006-03-25 01:24:25 -0800 | [diff] [blame] | 1418 | int err; |
| 1419 | |
| 1420 | rtnl_lock(); |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1421 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
Herbert Xu | 9f51495 | 2006-03-25 01:24:25 -0800 | [diff] [blame] | 1422 | rtnl_unlock(); |
| 1423 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1425 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | |
| 1427 | /** |
| 1428 | * call_netdevice_notifiers - call all network notifier blocks |
| 1429 | * @val: value passed unmodified to notifier function |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1430 | * @dev: net_device pointer passed unmodified to notifier function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | * |
| 1432 | * Call all network notifier blocks. Parameters and return value |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1433 | * are as for raw_notifier_call_chain(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | */ |
| 1435 | |
Eric W. Biederman | ad7379d | 2007-09-16 15:33:32 -0700 | [diff] [blame] | 1436 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | { |
Eric W. Biederman | ad7379d | 2007-09-16 15:33:32 -0700 | [diff] [blame] | 1438 | return raw_notifier_call_chain(&netdev_chain, val, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | } |
| 1440 | |
| 1441 | /* When > 0 there are consumers of rx skb time stamps */ |
| 1442 | static atomic_t netstamp_needed = ATOMIC_INIT(0); |
| 1443 | |
| 1444 | void net_enable_timestamp(void) |
| 1445 | { |
| 1446 | atomic_inc(&netstamp_needed); |
| 1447 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1448 | EXPORT_SYMBOL(net_enable_timestamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | |
| 1450 | void net_disable_timestamp(void) |
| 1451 | { |
| 1452 | atomic_dec(&netstamp_needed); |
| 1453 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1454 | EXPORT_SYMBOL(net_disable_timestamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1456 | static inline void net_timestamp(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | { |
| 1458 | if (atomic_read(&netstamp_needed)) |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1459 | __net_timestamp(skb); |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1460 | else |
| 1461 | skb->tstamp.tv64 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | } |
| 1463 | |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1464 | /** |
| 1465 | * dev_forward_skb - loopback an skb to another netif |
| 1466 | * |
| 1467 | * @dev: destination network device |
| 1468 | * @skb: buffer to forward |
| 1469 | * |
| 1470 | * return values: |
| 1471 | * NET_RX_SUCCESS (no congestion) |
| 1472 | * NET_RX_DROP (packet was dropped) |
| 1473 | * |
| 1474 | * dev_forward_skb can be used for injecting an skb from the |
| 1475 | * start_xmit function of one device into the receive queue |
| 1476 | * of another device. |
| 1477 | * |
| 1478 | * The receiving device may be in another namespace, so |
| 1479 | * we have to clear all information in the skb that could |
| 1480 | * impact namespace isolation. |
| 1481 | */ |
| 1482 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
| 1483 | { |
| 1484 | skb_orphan(skb); |
| 1485 | |
| 1486 | if (!(dev->flags & IFF_UP)) |
| 1487 | return NET_RX_DROP; |
| 1488 | |
| 1489 | if (skb->len > (dev->mtu + dev->hard_header_len)) |
| 1490 | return NET_RX_DROP; |
| 1491 | |
Arnd Bergmann | 8a83a00 | 2010-01-30 12:23:03 +0000 | [diff] [blame] | 1492 | skb_set_dev(skb, dev); |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1493 | skb->tstamp.tv64 = 0; |
| 1494 | skb->pkt_type = PACKET_HOST; |
| 1495 | skb->protocol = eth_type_trans(skb, dev); |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1496 | return netif_rx(skb); |
| 1497 | } |
| 1498 | EXPORT_SYMBOL_GPL(dev_forward_skb); |
| 1499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | /* |
| 1501 | * Support routine. Sends outgoing frames to any network |
| 1502 | * taps currently in use. |
| 1503 | */ |
| 1504 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1505 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | { |
| 1507 | struct packet_type *ptype; |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1508 | |
Jarek Poplawski | 8caf153 | 2009-04-17 10:08:49 +0000 | [diff] [blame] | 1509 | #ifdef CONFIG_NET_CLS_ACT |
| 1510 | if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS))) |
| 1511 | net_timestamp(skb); |
| 1512 | #else |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1513 | net_timestamp(skb); |
Jarek Poplawski | 8caf153 | 2009-04-17 10:08:49 +0000 | [diff] [blame] | 1514 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | |
| 1516 | rcu_read_lock(); |
| 1517 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
| 1518 | /* Never send packets back to the socket |
| 1519 | * they originated from - MvS (miquels@drinkel.ow.org) |
| 1520 | */ |
| 1521 | if ((ptype->dev == dev || !ptype->dev) && |
| 1522 | (ptype->af_packet_priv == NULL || |
| 1523 | (struct sock *)ptype->af_packet_priv != skb->sk)) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1524 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | if (!skb2) |
| 1526 | break; |
| 1527 | |
| 1528 | /* skb->nh should be correctly |
| 1529 | set by sender, so that the second statement is |
| 1530 | just protection against buggy protocols. |
| 1531 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1532 | skb_reset_mac_header(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1534 | if (skb_network_header(skb2) < skb2->data || |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1535 | skb2->network_header > skb2->tail) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | if (net_ratelimit()) |
| 1537 | printk(KERN_CRIT "protocol %04x is " |
| 1538 | "buggy, dev %s\n", |
| 1539 | skb2->protocol, dev->name); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1540 | skb_reset_network_header(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | } |
| 1542 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1543 | skb2->transport_header = skb2->network_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | skb2->pkt_type = PACKET_OUTGOING; |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 1545 | ptype->func(skb2, skb->dev, ptype, skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | } |
| 1547 | } |
| 1548 | rcu_read_unlock(); |
| 1549 | } |
| 1550 | |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1551 | |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 1552 | static inline void __netif_reschedule(struct Qdisc *q) |
| 1553 | { |
| 1554 | struct softnet_data *sd; |
| 1555 | unsigned long flags; |
| 1556 | |
| 1557 | local_irq_save(flags); |
| 1558 | sd = &__get_cpu_var(softnet_data); |
| 1559 | q->next_sched = sd->output_queue; |
| 1560 | sd->output_queue = q; |
| 1561 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 1562 | local_irq_restore(flags); |
| 1563 | } |
| 1564 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 1565 | void __netif_schedule(struct Qdisc *q) |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1566 | { |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 1567 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) |
| 1568 | __netif_reschedule(q); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1569 | } |
| 1570 | EXPORT_SYMBOL(__netif_schedule); |
| 1571 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1572 | void dev_kfree_skb_irq(struct sk_buff *skb) |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1573 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1574 | if (atomic_dec_and_test(&skb->users)) { |
| 1575 | struct softnet_data *sd; |
| 1576 | unsigned long flags; |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1577 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1578 | local_irq_save(flags); |
| 1579 | sd = &__get_cpu_var(softnet_data); |
| 1580 | skb->next = sd->completion_queue; |
| 1581 | sd->completion_queue = skb; |
| 1582 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 1583 | local_irq_restore(flags); |
| 1584 | } |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1585 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1586 | EXPORT_SYMBOL(dev_kfree_skb_irq); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1587 | |
| 1588 | void dev_kfree_skb_any(struct sk_buff *skb) |
| 1589 | { |
| 1590 | if (in_irq() || irqs_disabled()) |
| 1591 | dev_kfree_skb_irq(skb); |
| 1592 | else |
| 1593 | dev_kfree_skb(skb); |
| 1594 | } |
| 1595 | EXPORT_SYMBOL(dev_kfree_skb_any); |
| 1596 | |
| 1597 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1598 | /** |
| 1599 | * netif_device_detach - mark device as removed |
| 1600 | * @dev: network device |
| 1601 | * |
| 1602 | * Mark device as removed from system and therefore no longer available. |
| 1603 | */ |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1604 | void netif_device_detach(struct net_device *dev) |
| 1605 | { |
| 1606 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && |
| 1607 | netif_running(dev)) { |
Alexander Duyck | d543103 | 2009-04-08 13:15:22 +0000 | [diff] [blame] | 1608 | netif_tx_stop_all_queues(dev); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1609 | } |
| 1610 | } |
| 1611 | EXPORT_SYMBOL(netif_device_detach); |
| 1612 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1613 | /** |
| 1614 | * netif_device_attach - mark device as attached |
| 1615 | * @dev: network device |
| 1616 | * |
| 1617 | * Mark device as attached from system and restart if needed. |
| 1618 | */ |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1619 | void netif_device_attach(struct net_device *dev) |
| 1620 | { |
| 1621 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && |
| 1622 | netif_running(dev)) { |
Alexander Duyck | d543103 | 2009-04-08 13:15:22 +0000 | [diff] [blame] | 1623 | netif_tx_wake_all_queues(dev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1624 | __netdev_watchdog_up(dev); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1625 | } |
| 1626 | } |
| 1627 | EXPORT_SYMBOL(netif_device_attach); |
| 1628 | |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 1629 | static bool can_checksum_protocol(unsigned long features, __be16 protocol) |
| 1630 | { |
| 1631 | return ((features & NETIF_F_GEN_CSUM) || |
| 1632 | ((features & NETIF_F_IP_CSUM) && |
| 1633 | protocol == htons(ETH_P_IP)) || |
| 1634 | ((features & NETIF_F_IPV6_CSUM) && |
Yi Zou | 1c8dbcf | 2009-02-27 14:06:54 -0800 | [diff] [blame] | 1635 | protocol == htons(ETH_P_IPV6)) || |
| 1636 | ((features & NETIF_F_FCOE_CRC) && |
| 1637 | protocol == htons(ETH_P_FCOE))); |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 1638 | } |
| 1639 | |
| 1640 | static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb) |
| 1641 | { |
| 1642 | if (can_checksum_protocol(dev->features, skb->protocol)) |
| 1643 | return true; |
| 1644 | |
| 1645 | if (skb->protocol == htons(ETH_P_8021Q)) { |
| 1646 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; |
| 1647 | if (can_checksum_protocol(dev->features & dev->vlan_features, |
| 1648 | veh->h_vlan_encapsulated_proto)) |
| 1649 | return true; |
| 1650 | } |
| 1651 | |
| 1652 | return false; |
| 1653 | } |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1654 | |
Arnd Bergmann | 8a83a00 | 2010-01-30 12:23:03 +0000 | [diff] [blame] | 1655 | /** |
| 1656 | * skb_dev_set -- assign a new device to a buffer |
| 1657 | * @skb: buffer for the new device |
| 1658 | * @dev: network device |
| 1659 | * |
| 1660 | * If an skb is owned by a device already, we have to reset |
| 1661 | * all data private to the namespace a device belongs to |
| 1662 | * before assigning it a new device. |
| 1663 | */ |
| 1664 | #ifdef CONFIG_NET_NS |
| 1665 | void skb_set_dev(struct sk_buff *skb, struct net_device *dev) |
| 1666 | { |
| 1667 | skb_dst_drop(skb); |
| 1668 | if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) { |
| 1669 | secpath_reset(skb); |
| 1670 | nf_reset(skb); |
| 1671 | skb_init_secmark(skb); |
| 1672 | skb->mark = 0; |
| 1673 | skb->priority = 0; |
| 1674 | skb->nf_trace = 0; |
| 1675 | skb->ipvs_property = 0; |
| 1676 | #ifdef CONFIG_NET_SCHED |
| 1677 | skb->tc_index = 0; |
| 1678 | #endif |
| 1679 | } |
| 1680 | skb->dev = dev; |
| 1681 | } |
| 1682 | EXPORT_SYMBOL(skb_set_dev); |
| 1683 | #endif /* CONFIG_NET_NS */ |
| 1684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | /* |
| 1686 | * Invalidate hardware checksum when packet is to be mangled, and |
| 1687 | * complete checksum manually on outgoing path. |
| 1688 | */ |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1689 | int skb_checksum_help(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | { |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 1691 | __wsum csum; |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 1692 | int ret = 0, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1694 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1695 | goto out_set_summed; |
| 1696 | |
| 1697 | if (unlikely(skb_shinfo(skb)->gso_size)) { |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1698 | /* Let GSO fix up the checksum. */ |
| 1699 | goto out_set_summed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | } |
| 1701 | |
Herbert Xu | a030847 | 2007-10-15 01:47:15 -0700 | [diff] [blame] | 1702 | offset = skb->csum_start - skb_headroom(skb); |
| 1703 | BUG_ON(offset >= skb_headlen(skb)); |
| 1704 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| 1705 | |
| 1706 | offset += skb->csum_offset; |
| 1707 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); |
| 1708 | |
| 1709 | if (skb_cloned(skb) && |
| 1710 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
| 1712 | if (ret) |
| 1713 | goto out; |
| 1714 | } |
| 1715 | |
Herbert Xu | a030847 | 2007-10-15 01:47:15 -0700 | [diff] [blame] | 1716 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1717 | out_set_summed: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | skb->ip_summed = CHECKSUM_NONE; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1719 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | return ret; |
| 1721 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1722 | EXPORT_SYMBOL(skb_checksum_help); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1724 | /** |
| 1725 | * skb_gso_segment - Perform segmentation on skb. |
| 1726 | * @skb: buffer to segment |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1727 | * @features: features for the output path (see dev->features) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1728 | * |
| 1729 | * This function segments the given skb and returns a list of segments. |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1730 | * |
| 1731 | * It may return NULL if the skb requires no segmentation. This is |
| 1732 | * only possible when GSO is used for verifying header integrity. |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1733 | */ |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1734 | struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1735 | { |
| 1736 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); |
| 1737 | struct packet_type *ptype; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 1738 | __be16 type = skb->protocol; |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1739 | int err; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1740 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1741 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1742 | skb->mac_len = skb->network_header - skb->mac_header; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1743 | __skb_pull(skb, skb->mac_len); |
| 1744 | |
Herbert Xu | 67fd1a7 | 2009-01-19 16:26:44 -0800 | [diff] [blame] | 1745 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
| 1746 | struct net_device *dev = skb->dev; |
| 1747 | struct ethtool_drvinfo info = {}; |
| 1748 | |
| 1749 | if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo) |
| 1750 | dev->ethtool_ops->get_drvinfo(dev, &info); |
| 1751 | |
| 1752 | WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d " |
| 1753 | "ip_summed=%d", |
| 1754 | info.driver, dev ? dev->features : 0L, |
| 1755 | skb->sk ? skb->sk->sk_route_caps : 0L, |
| 1756 | skb->len, skb->data_len, skb->ip_summed); |
| 1757 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1758 | if (skb_header_cloned(skb) && |
| 1759 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) |
| 1760 | return ERR_PTR(err); |
| 1761 | } |
| 1762 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1763 | rcu_read_lock(); |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 1764 | list_for_each_entry_rcu(ptype, |
| 1765 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1766 | if (ptype->type == type && !ptype->dev && ptype->gso_segment) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1767 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1768 | err = ptype->gso_send_check(skb); |
| 1769 | segs = ERR_PTR(err); |
| 1770 | if (err || skb_gso_ok(skb, features)) |
| 1771 | break; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1772 | __skb_push(skb, (skb->data - |
| 1773 | skb_network_header(skb))); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1774 | } |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1775 | segs = ptype->gso_segment(skb, features); |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1776 | break; |
| 1777 | } |
| 1778 | } |
| 1779 | rcu_read_unlock(); |
| 1780 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1781 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1782 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1783 | return segs; |
| 1784 | } |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1785 | EXPORT_SYMBOL(skb_gso_segment); |
| 1786 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1787 | /* Take action when hardware reception checksum errors are detected. */ |
| 1788 | #ifdef CONFIG_BUG |
| 1789 | void netdev_rx_csum_fault(struct net_device *dev) |
| 1790 | { |
| 1791 | if (net_ratelimit()) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1792 | printk(KERN_ERR "%s: hw csum failure.\n", |
Stephen Hemminger | 246a421 | 2005-12-08 15:21:39 -0800 | [diff] [blame] | 1793 | dev ? dev->name : "<unknown>"); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1794 | dump_stack(); |
| 1795 | } |
| 1796 | } |
| 1797 | EXPORT_SYMBOL(netdev_rx_csum_fault); |
| 1798 | #endif |
| 1799 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | /* Actually, we should eliminate this check as soon as we know, that: |
| 1801 | * 1. IOMMU is present and allows to map all the memory. |
| 1802 | * 2. No high memory really exists on this machine. |
| 1803 | */ |
| 1804 | |
Eric Dumazet | 9092c65 | 2010-04-02 13:34:49 -0700 | [diff] [blame] | 1805 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | { |
Herbert Xu | 3d3a853 | 2006-06-27 13:33:10 -0700 | [diff] [blame] | 1807 | #ifdef CONFIG_HIGHMEM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | int i; |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 1809 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
| 1810 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) |
| 1811 | if (PageHighMem(skb_shinfo(skb)->frags[i].page)) |
| 1812 | return 1; |
| 1813 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 1815 | if (PCI_DMA_BUS_IS_PHYS) { |
| 1816 | struct device *pdev = dev->dev.parent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | |
Eric Dumazet | 9092c65 | 2010-04-02 13:34:49 -0700 | [diff] [blame] | 1818 | if (!pdev) |
| 1819 | return 0; |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 1820 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 1821 | dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page); |
| 1822 | if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) |
| 1823 | return 1; |
| 1824 | } |
| 1825 | } |
Herbert Xu | 3d3a853 | 2006-06-27 13:33:10 -0700 | [diff] [blame] | 1826 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | return 0; |
| 1828 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1830 | struct dev_gso_cb { |
| 1831 | void (*destructor)(struct sk_buff *skb); |
| 1832 | }; |
| 1833 | |
| 1834 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) |
| 1835 | |
| 1836 | static void dev_gso_skb_destructor(struct sk_buff *skb) |
| 1837 | { |
| 1838 | struct dev_gso_cb *cb; |
| 1839 | |
| 1840 | do { |
| 1841 | struct sk_buff *nskb = skb->next; |
| 1842 | |
| 1843 | skb->next = nskb->next; |
| 1844 | nskb->next = NULL; |
| 1845 | kfree_skb(nskb); |
| 1846 | } while (skb->next); |
| 1847 | |
| 1848 | cb = DEV_GSO_CB(skb); |
| 1849 | if (cb->destructor) |
| 1850 | cb->destructor(skb); |
| 1851 | } |
| 1852 | |
| 1853 | /** |
| 1854 | * dev_gso_segment - Perform emulated hardware segmentation on skb. |
| 1855 | * @skb: buffer to segment |
| 1856 | * |
| 1857 | * This function segments the given skb and stores the list of segments |
| 1858 | * in skb->next. |
| 1859 | */ |
| 1860 | static int dev_gso_segment(struct sk_buff *skb) |
| 1861 | { |
| 1862 | struct net_device *dev = skb->dev; |
| 1863 | struct sk_buff *segs; |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1864 | int features = dev->features & ~(illegal_highdma(dev, skb) ? |
| 1865 | NETIF_F_SG : 0); |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1866 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1867 | segs = skb_gso_segment(skb, features); |
| 1868 | |
| 1869 | /* Verifying header integrity only. */ |
| 1870 | if (!segs) |
| 1871 | return 0; |
| 1872 | |
Hirofumi Nakagawa | 801678c | 2008-04-29 01:03:09 -0700 | [diff] [blame] | 1873 | if (IS_ERR(segs)) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1874 | return PTR_ERR(segs); |
| 1875 | |
| 1876 | skb->next = segs; |
| 1877 | DEV_GSO_CB(skb)->destructor = skb->destructor; |
| 1878 | skb->destructor = dev_gso_skb_destructor; |
| 1879 | |
| 1880 | return 0; |
| 1881 | } |
| 1882 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 1883 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, |
| 1884 | struct netdev_queue *txq) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1885 | { |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1886 | const struct net_device_ops *ops = dev->netdev_ops; |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1887 | int rc = NETDEV_TX_OK; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1888 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1889 | if (likely(!skb->next)) { |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 1890 | if (!list_empty(&ptype_all)) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1891 | dev_queue_xmit_nit(skb, dev); |
| 1892 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1893 | if (netif_needs_gso(dev, skb)) { |
| 1894 | if (unlikely(dev_gso_segment(skb))) |
| 1895 | goto out_kfree_skb; |
| 1896 | if (skb->next) |
| 1897 | goto gso; |
| 1898 | } |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1899 | |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 1900 | /* |
| 1901 | * If device doesnt need skb->dst, release it right now while |
| 1902 | * its hot in this cpu cache |
| 1903 | */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1904 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
| 1905 | skb_dst_drop(skb); |
| 1906 | |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1907 | rc = ops->ndo_start_xmit(skb, dev); |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 1908 | if (rc == NETDEV_TX_OK) |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 1909 | txq_trans_update(txq); |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1910 | /* |
| 1911 | * TODO: if skb_orphan() was called by |
| 1912 | * dev->hard_start_xmit() (for example, the unmodified |
| 1913 | * igb driver does that; bnx2 doesn't), then |
| 1914 | * skb_tx_software_timestamp() will be unable to send |
| 1915 | * back the time stamp. |
| 1916 | * |
| 1917 | * How can this be prevented? Always create another |
| 1918 | * reference to the socket before calling |
| 1919 | * dev->hard_start_xmit()? Prevent that skb_orphan() |
| 1920 | * does anything in dev->hard_start_xmit() by clearing |
| 1921 | * the skb destructor before the call and restoring it |
| 1922 | * afterwards, then doing the skb_orphan() ourselves? |
| 1923 | */ |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1924 | return rc; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1925 | } |
| 1926 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1927 | gso: |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1928 | do { |
| 1929 | struct sk_buff *nskb = skb->next; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1930 | |
| 1931 | skb->next = nskb->next; |
| 1932 | nskb->next = NULL; |
Krishna Kumar | 068a2de | 2009-12-09 20:59:58 +0000 | [diff] [blame] | 1933 | |
| 1934 | /* |
| 1935 | * If device doesnt need nskb->dst, release it right now while |
| 1936 | * its hot in this cpu cache |
| 1937 | */ |
| 1938 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
| 1939 | skb_dst_drop(nskb); |
| 1940 | |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1941 | rc = ops->ndo_start_xmit(nskb, dev); |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 1942 | if (unlikely(rc != NETDEV_TX_OK)) { |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1943 | if (rc & ~NETDEV_TX_MASK) |
| 1944 | goto out_kfree_gso_skb; |
Michael Chan | f54d9e8 | 2006-06-25 23:57:04 -0700 | [diff] [blame] | 1945 | nskb->next = skb->next; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1946 | skb->next = nskb; |
| 1947 | return rc; |
| 1948 | } |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 1949 | txq_trans_update(txq); |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 1950 | if (unlikely(netif_tx_queue_stopped(txq) && skb->next)) |
Michael Chan | f54d9e8 | 2006-06-25 23:57:04 -0700 | [diff] [blame] | 1951 | return NETDEV_TX_BUSY; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1952 | } while (skb->next); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1953 | |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1954 | out_kfree_gso_skb: |
| 1955 | if (likely(skb->next == NULL)) |
| 1956 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1957 | out_kfree_skb: |
| 1958 | kfree_skb(skb); |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1959 | return rc; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1960 | } |
| 1961 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 1962 | static u32 hashrnd __read_mostly; |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 1963 | |
Stephen Hemminger | 9247744 | 2009-03-21 13:39:26 -0700 | [diff] [blame] | 1964 | u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb) |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 1965 | { |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 1966 | u32 hash; |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 1967 | |
David S. Miller | 513de11 | 2009-05-03 14:43:10 -0700 | [diff] [blame] | 1968 | if (skb_rx_queue_recorded(skb)) { |
| 1969 | hash = skb_get_rx_queue(skb); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1970 | while (unlikely(hash >= dev->real_num_tx_queues)) |
David S. Miller | 513de11 | 2009-05-03 14:43:10 -0700 | [diff] [blame] | 1971 | hash -= dev->real_num_tx_queues; |
| 1972 | return hash; |
| 1973 | } |
Eric Dumazet | ec581f6 | 2009-05-01 09:05:06 -0700 | [diff] [blame] | 1974 | |
| 1975 | if (skb->sk && skb->sk->sk_hash) |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 1976 | hash = skb->sk->sk_hash; |
Eric Dumazet | ec581f6 | 2009-05-01 09:05:06 -0700 | [diff] [blame] | 1977 | else |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 1978 | hash = skb->protocol; |
David S. Miller | d5a9e24 | 2009-01-27 16:22:11 -0800 | [diff] [blame] | 1979 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 1980 | hash = jhash_1word(hash, hashrnd); |
David S. Miller | d5a9e24 | 2009-01-27 16:22:11 -0800 | [diff] [blame] | 1981 | |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 1982 | return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32); |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 1983 | } |
Stephen Hemminger | 9247744 | 2009-03-21 13:39:26 -0700 | [diff] [blame] | 1984 | EXPORT_SYMBOL(skb_tx_hash); |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 1985 | |
Eric Dumazet | ed04642 | 2009-11-13 21:54:04 +0000 | [diff] [blame] | 1986 | static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index) |
| 1987 | { |
| 1988 | if (unlikely(queue_index >= dev->real_num_tx_queues)) { |
| 1989 | if (net_ratelimit()) { |
Eric Dumazet | 7a161ea | 2010-04-08 21:26:13 +0000 | [diff] [blame] | 1990 | pr_warning("%s selects TX queue %d, but " |
| 1991 | "real number of TX queues is %d\n", |
| 1992 | dev->name, queue_index, dev->real_num_tx_queues); |
Eric Dumazet | ed04642 | 2009-11-13 21:54:04 +0000 | [diff] [blame] | 1993 | } |
| 1994 | return 0; |
| 1995 | } |
| 1996 | return queue_index; |
| 1997 | } |
| 1998 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 1999 | static struct netdev_queue *dev_pick_tx(struct net_device *dev, |
| 2000 | struct sk_buff *skb) |
| 2001 | { |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2002 | u16 queue_index; |
| 2003 | struct sock *sk = skb->sk; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2004 | |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2005 | if (sk_tx_queue_recorded(sk)) { |
| 2006 | queue_index = sk_tx_queue_get(sk); |
| 2007 | } else { |
| 2008 | const struct net_device_ops *ops = dev->netdev_ops; |
| 2009 | |
| 2010 | if (ops->ndo_select_queue) { |
| 2011 | queue_index = ops->ndo_select_queue(dev, skb); |
Eric Dumazet | ed04642 | 2009-11-13 21:54:04 +0000 | [diff] [blame] | 2012 | queue_index = dev_cap_txqueue(dev, queue_index); |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2013 | } else { |
| 2014 | queue_index = 0; |
| 2015 | if (dev->real_num_tx_queues > 1) |
| 2016 | queue_index = skb_tx_hash(dev, skb); |
| 2017 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 2018 | if (sk && rcu_dereference_check(sk->sk_dst_cache, 1)) |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2019 | sk_tx_queue_set(sk, queue_index); |
| 2020 | } |
| 2021 | } |
David S. Miller | eae792b | 2008-07-15 03:03:33 -0700 | [diff] [blame] | 2022 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2023 | skb_set_queue_mapping(skb, queue_index); |
| 2024 | return netdev_get_tx_queue(dev, queue_index); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 2025 | } |
| 2026 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2027 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
| 2028 | struct net_device *dev, |
| 2029 | struct netdev_queue *txq) |
| 2030 | { |
| 2031 | spinlock_t *root_lock = qdisc_lock(q); |
| 2032 | int rc; |
| 2033 | |
| 2034 | spin_lock(root_lock); |
| 2035 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { |
| 2036 | kfree_skb(skb); |
| 2037 | rc = NET_XMIT_DROP; |
| 2038 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && |
| 2039 | !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) { |
| 2040 | /* |
| 2041 | * This is a work-conserving queue; there are no old skbs |
| 2042 | * waiting to be sent out; and the qdisc is not running - |
| 2043 | * xmit the skb directly. |
| 2044 | */ |
| 2045 | __qdisc_update_bstats(q, skb->len); |
| 2046 | if (sch_direct_xmit(skb, q, dev, txq, root_lock)) |
| 2047 | __qdisc_run(q); |
| 2048 | else |
| 2049 | clear_bit(__QDISC_STATE_RUNNING, &q->state); |
| 2050 | |
| 2051 | rc = NET_XMIT_SUCCESS; |
| 2052 | } else { |
| 2053 | rc = qdisc_enqueue_root(skb, q); |
| 2054 | qdisc_run(q); |
| 2055 | } |
| 2056 | spin_unlock(root_lock); |
| 2057 | |
| 2058 | return rc; |
| 2059 | } |
| 2060 | |
Krishna Kumar | 4b25846 | 2010-01-21 01:26:29 -0800 | [diff] [blame] | 2061 | /* |
| 2062 | * Returns true if either: |
| 2063 | * 1. skb has frag_list and the device doesn't support FRAGLIST, or |
| 2064 | * 2. skb is fragmented and the device does not support SG, or if |
| 2065 | * at least one of fragments is in highmem and device does not |
| 2066 | * support DMA from it. |
| 2067 | */ |
| 2068 | static inline int skb_needs_linearize(struct sk_buff *skb, |
| 2069 | struct net_device *dev) |
| 2070 | { |
| 2071 | return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) || |
| 2072 | (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) || |
| 2073 | illegal_highdma(dev, skb))); |
| 2074 | } |
| 2075 | |
Dave Jones | d29f749 | 2008-07-22 14:09:06 -0700 | [diff] [blame] | 2076 | /** |
| 2077 | * dev_queue_xmit - transmit a buffer |
| 2078 | * @skb: buffer to transmit |
| 2079 | * |
| 2080 | * Queue a buffer for transmission to a network device. The caller must |
| 2081 | * have set the device and priority and built the buffer before calling |
| 2082 | * this function. The function can be called from an interrupt. |
| 2083 | * |
| 2084 | * A negative errno code is returned on a failure. A success does not |
| 2085 | * guarantee the frame will be transmitted as it may be dropped due |
| 2086 | * to congestion or traffic shaping. |
| 2087 | * |
| 2088 | * ----------------------------------------------------------------------------------- |
| 2089 | * I notice this method can also return errors from the queue disciplines, |
| 2090 | * including NET_XMIT_DROP, which is a positive value. So, errors can also |
| 2091 | * be positive. |
| 2092 | * |
| 2093 | * Regardless of the return value, the skb is consumed, so it is currently |
| 2094 | * difficult to retry a send to this method. (You can bump the ref count |
| 2095 | * before sending to hold a reference for retry if you are careful.) |
| 2096 | * |
| 2097 | * When calling this method, interrupts MUST be enabled. This is because |
| 2098 | * the BH enable code must have IRQs enabled so that it will not deadlock. |
| 2099 | * --BLG |
| 2100 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | int dev_queue_xmit(struct sk_buff *skb) |
| 2102 | { |
| 2103 | struct net_device *dev = skb->dev; |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 2104 | struct netdev_queue *txq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | struct Qdisc *q; |
| 2106 | int rc = -ENOMEM; |
| 2107 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2108 | /* GSO will handle the following emulations directly. */ |
| 2109 | if (netif_needs_gso(dev, skb)) |
| 2110 | goto gso; |
| 2111 | |
Krishna Kumar | 4b25846 | 2010-01-21 01:26:29 -0800 | [diff] [blame] | 2112 | /* Convert a paged skb to linear, if required */ |
| 2113 | if (skb_needs_linearize(skb, dev) && __skb_linearize(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | goto out_kfree_skb; |
| 2115 | |
| 2116 | /* If packet is not checksummed and device does not support |
| 2117 | * checksumming for this protocol, complete checksumming here. |
| 2118 | */ |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 2119 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 2120 | skb_set_transport_header(skb, skb->csum_start - |
| 2121 | skb_headroom(skb)); |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 2122 | if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb)) |
| 2123 | goto out_kfree_skb; |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 2124 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2126 | gso: |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2127 | /* Disable soft irqs for various locks below. Also |
| 2128 | * stops preemption for RCU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2129 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2130 | rcu_read_lock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | |
David S. Miller | eae792b | 2008-07-15 03:03:33 -0700 | [diff] [blame] | 2132 | txq = dev_pick_tx(dev, skb); |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 2133 | q = rcu_dereference_bh(txq->qdisc); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | #ifdef CONFIG_NET_CLS_ACT |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2136 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | #endif |
| 2138 | if (q->enqueue) { |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2139 | rc = __dev_xmit_skb(skb, q, dev, txq); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2140 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | } |
| 2142 | |
| 2143 | /* The device has no queue. Common case for software devices: |
| 2144 | loopback, all the sorts of tunnels... |
| 2145 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 2146 | Really, it is unlikely that netif_tx_lock protection is necessary |
| 2147 | here. (f.e. loopback and IP tunnels are clean ignoring statistics |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | counters.) |
| 2149 | However, it is possible, that they rely on protection |
| 2150 | made by us here. |
| 2151 | |
| 2152 | Check this and shot the lock. It is not prone from deadlocks. |
| 2153 | Either shot noqueue qdisc, it is even simpler 8) |
| 2154 | */ |
| 2155 | if (dev->flags & IFF_UP) { |
| 2156 | int cpu = smp_processor_id(); /* ok because BHs are off */ |
| 2157 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2158 | if (txq->xmit_lock_owner != cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2160 | HARD_TX_LOCK(dev, txq, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2162 | if (!netif_tx_queue_stopped(txq)) { |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2163 | rc = dev_hard_start_xmit(skb, dev, txq); |
| 2164 | if (dev_xmit_complete(rc)) { |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2165 | HARD_TX_UNLOCK(dev, txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | goto out; |
| 2167 | } |
| 2168 | } |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2169 | HARD_TX_UNLOCK(dev, txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | if (net_ratelimit()) |
| 2171 | printk(KERN_CRIT "Virtual device %s asks to " |
| 2172 | "queue packet!\n", dev->name); |
| 2173 | } else { |
| 2174 | /* Recursion is detected! It is possible, |
| 2175 | * unfortunately */ |
| 2176 | if (net_ratelimit()) |
| 2177 | printk(KERN_CRIT "Dead loop on virtual device " |
| 2178 | "%s, fix it urgently!\n", dev->name); |
| 2179 | } |
| 2180 | } |
| 2181 | |
| 2182 | rc = -ENETDOWN; |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 2183 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | |
| 2185 | out_kfree_skb: |
| 2186 | kfree_skb(skb); |
| 2187 | return rc; |
| 2188 | out: |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 2189 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | return rc; |
| 2191 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2192 | EXPORT_SYMBOL(dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | |
| 2194 | |
| 2195 | /*======================================================================= |
| 2196 | Receiver routines |
| 2197 | =======================================================================*/ |
| 2198 | |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 2199 | int netdev_max_backlog __read_mostly = 1000; |
| 2200 | int netdev_budget __read_mostly = 300; |
| 2201 | int weight_p __read_mostly = 64; /* old backlog weight */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | |
| 2203 | DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, }; |
| 2204 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 2205 | #ifdef CONFIG_RPS |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2206 | |
| 2207 | /* One global table that all flow-based protocols share. */ |
| 2208 | struct rps_sock_flow_table *rps_sock_flow_table; |
| 2209 | EXPORT_SYMBOL(rps_sock_flow_table); |
| 2210 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2211 | /* |
| 2212 | * get_rps_cpu is called from netif_receive_skb and returns the target |
| 2213 | * CPU from the RPS map of the receiving queue for a given skb. |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2214 | * rcu_read_lock must be held on entry. |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2215 | */ |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2216 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, |
| 2217 | struct rps_dev_flow **rflowp) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2218 | { |
| 2219 | struct ipv6hdr *ip6; |
| 2220 | struct iphdr *ip; |
| 2221 | struct netdev_rx_queue *rxqueue; |
| 2222 | struct rps_map *map; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2223 | struct rps_dev_flow_table *flow_table; |
| 2224 | struct rps_sock_flow_table *sock_flow_table; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2225 | int cpu = -1; |
| 2226 | u8 ip_proto; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2227 | u16 tcpu; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2228 | u32 addr1, addr2, ports, ihl; |
| 2229 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2230 | if (skb_rx_queue_recorded(skb)) { |
| 2231 | u16 index = skb_get_rx_queue(skb); |
| 2232 | if (unlikely(index >= dev->num_rx_queues)) { |
| 2233 | if (net_ratelimit()) { |
Eric Dumazet | 7a161ea | 2010-04-08 21:26:13 +0000 | [diff] [blame] | 2234 | pr_warning("%s received packet on queue " |
| 2235 | "%u, but number of RX queues is %u\n", |
| 2236 | dev->name, index, dev->num_rx_queues); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2237 | } |
| 2238 | goto done; |
| 2239 | } |
| 2240 | rxqueue = dev->_rx + index; |
| 2241 | } else |
| 2242 | rxqueue = dev->_rx; |
| 2243 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2244 | if (!rxqueue->rps_map && !rxqueue->rps_flow_table) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2245 | goto done; |
| 2246 | |
| 2247 | if (skb->rxhash) |
| 2248 | goto got_hash; /* Skip hash computation on packet header */ |
| 2249 | |
| 2250 | switch (skb->protocol) { |
| 2251 | case __constant_htons(ETH_P_IP): |
| 2252 | if (!pskb_may_pull(skb, sizeof(*ip))) |
| 2253 | goto done; |
| 2254 | |
| 2255 | ip = (struct iphdr *) skb->data; |
| 2256 | ip_proto = ip->protocol; |
| 2257 | addr1 = ip->saddr; |
| 2258 | addr2 = ip->daddr; |
| 2259 | ihl = ip->ihl; |
| 2260 | break; |
| 2261 | case __constant_htons(ETH_P_IPV6): |
| 2262 | if (!pskb_may_pull(skb, sizeof(*ip6))) |
| 2263 | goto done; |
| 2264 | |
| 2265 | ip6 = (struct ipv6hdr *) skb->data; |
| 2266 | ip_proto = ip6->nexthdr; |
| 2267 | addr1 = ip6->saddr.s6_addr32[3]; |
| 2268 | addr2 = ip6->daddr.s6_addr32[3]; |
| 2269 | ihl = (40 >> 2); |
| 2270 | break; |
| 2271 | default: |
| 2272 | goto done; |
| 2273 | } |
| 2274 | ports = 0; |
| 2275 | switch (ip_proto) { |
| 2276 | case IPPROTO_TCP: |
| 2277 | case IPPROTO_UDP: |
| 2278 | case IPPROTO_DCCP: |
| 2279 | case IPPROTO_ESP: |
| 2280 | case IPPROTO_AH: |
| 2281 | case IPPROTO_SCTP: |
| 2282 | case IPPROTO_UDPLITE: |
| 2283 | if (pskb_may_pull(skb, (ihl * 4) + 4)) |
| 2284 | ports = *((u32 *) (skb->data + (ihl * 4))); |
| 2285 | break; |
| 2286 | |
| 2287 | default: |
| 2288 | break; |
| 2289 | } |
| 2290 | |
| 2291 | skb->rxhash = jhash_3words(addr1, addr2, ports, hashrnd); |
| 2292 | if (!skb->rxhash) |
| 2293 | skb->rxhash = 1; |
| 2294 | |
| 2295 | got_hash: |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2296 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
| 2297 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
| 2298 | if (flow_table && sock_flow_table) { |
| 2299 | u16 next_cpu; |
| 2300 | struct rps_dev_flow *rflow; |
| 2301 | |
| 2302 | rflow = &flow_table->flows[skb->rxhash & flow_table->mask]; |
| 2303 | tcpu = rflow->cpu; |
| 2304 | |
| 2305 | next_cpu = sock_flow_table->ents[skb->rxhash & |
| 2306 | sock_flow_table->mask]; |
| 2307 | |
| 2308 | /* |
| 2309 | * If the desired CPU (where last recvmsg was done) is |
| 2310 | * different from current CPU (one in the rx-queue flow |
| 2311 | * table entry), switch if one of the following holds: |
| 2312 | * - Current CPU is unset (equal to RPS_NO_CPU). |
| 2313 | * - Current CPU is offline. |
| 2314 | * - The current CPU's queue tail has advanced beyond the |
| 2315 | * last packet that was enqueued using this table entry. |
| 2316 | * This guarantees that all previous packets for the flow |
| 2317 | * have been dequeued, thus preserving in order delivery. |
| 2318 | */ |
| 2319 | if (unlikely(tcpu != next_cpu) && |
| 2320 | (tcpu == RPS_NO_CPU || !cpu_online(tcpu) || |
| 2321 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
| 2322 | rflow->last_qtail)) >= 0)) { |
| 2323 | tcpu = rflow->cpu = next_cpu; |
| 2324 | if (tcpu != RPS_NO_CPU) |
| 2325 | rflow->last_qtail = per_cpu(softnet_data, |
| 2326 | tcpu).input_queue_head; |
| 2327 | } |
| 2328 | if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) { |
| 2329 | *rflowp = rflow; |
| 2330 | cpu = tcpu; |
| 2331 | goto done; |
| 2332 | } |
| 2333 | } |
| 2334 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2335 | map = rcu_dereference(rxqueue->rps_map); |
| 2336 | if (map) { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2337 | tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32]; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2338 | |
| 2339 | if (cpu_online(tcpu)) { |
| 2340 | cpu = tcpu; |
| 2341 | goto done; |
| 2342 | } |
| 2343 | } |
| 2344 | |
| 2345 | done: |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2346 | return cpu; |
| 2347 | } |
| 2348 | |
| 2349 | /* |
| 2350 | * This structure holds the per-CPU mask of CPUs for which IPIs are scheduled |
| 2351 | * to be sent to kick remote softirq processing. There are two masks since |
| 2352 | * the sending of IPIs must be done with interrupts enabled. The select field |
| 2353 | * indicates the current mask that enqueue_backlog uses to schedule IPIs. |
| 2354 | * select is flipped before net_rps_action is called while still under lock, |
| 2355 | * net_rps_action then uses the non-selected mask to send the IPIs and clears |
| 2356 | * it without conflicting with enqueue_backlog operation. |
| 2357 | */ |
| 2358 | struct rps_remote_softirq_cpus { |
| 2359 | cpumask_t mask[2]; |
| 2360 | int select; |
| 2361 | }; |
| 2362 | static DEFINE_PER_CPU(struct rps_remote_softirq_cpus, rps_remote_softirq_cpus); |
| 2363 | |
| 2364 | /* Called from hardirq (IPI) context */ |
| 2365 | static void trigger_softirq(void *data) |
| 2366 | { |
| 2367 | struct softnet_data *queue = data; |
| 2368 | __napi_schedule(&queue->backlog); |
| 2369 | __get_cpu_var(netdev_rx_stat).received_rps++; |
| 2370 | } |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2371 | #endif /* CONFIG_RPS */ |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2372 | |
| 2373 | /* |
| 2374 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog |
| 2375 | * queue (may be a remote CPU queue). |
| 2376 | */ |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2377 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
| 2378 | unsigned int *qtail) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2379 | { |
| 2380 | struct softnet_data *queue; |
| 2381 | unsigned long flags; |
| 2382 | |
| 2383 | queue = &per_cpu(softnet_data, cpu); |
| 2384 | |
| 2385 | local_irq_save(flags); |
| 2386 | __get_cpu_var(netdev_rx_stat).total++; |
| 2387 | |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2388 | rps_lock(queue); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2389 | if (queue->input_pkt_queue.qlen <= netdev_max_backlog) { |
| 2390 | if (queue->input_pkt_queue.qlen) { |
| 2391 | enqueue: |
| 2392 | __skb_queue_tail(&queue->input_pkt_queue, skb); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2393 | #ifdef CONFIG_RPS |
| 2394 | *qtail = queue->input_queue_head + |
| 2395 | queue->input_pkt_queue.qlen; |
| 2396 | #endif |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2397 | rps_unlock(queue); |
| 2398 | local_irq_restore(flags); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2399 | return NET_RX_SUCCESS; |
| 2400 | } |
| 2401 | |
| 2402 | /* Schedule NAPI for backlog device */ |
| 2403 | if (napi_schedule_prep(&queue->backlog)) { |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 2404 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2405 | if (cpu != smp_processor_id()) { |
| 2406 | struct rps_remote_softirq_cpus *rcpus = |
| 2407 | &__get_cpu_var(rps_remote_softirq_cpus); |
| 2408 | |
| 2409 | cpu_set(cpu, rcpus->mask[rcpus->select]); |
| 2410 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2411 | goto enqueue; |
| 2412 | } |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 2413 | #endif |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2414 | __napi_schedule(&queue->backlog); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2415 | } |
| 2416 | goto enqueue; |
| 2417 | } |
| 2418 | |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2419 | rps_unlock(queue); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2420 | |
| 2421 | __get_cpu_var(netdev_rx_stat).dropped++; |
| 2422 | local_irq_restore(flags); |
| 2423 | |
| 2424 | kfree_skb(skb); |
| 2425 | return NET_RX_DROP; |
| 2426 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2428 | /** |
| 2429 | * netif_rx - post buffer to the network code |
| 2430 | * @skb: buffer to post |
| 2431 | * |
| 2432 | * This function receives a packet from a device driver and queues it for |
| 2433 | * the upper (protocol) levels to process. It always succeeds. The buffer |
| 2434 | * may be dropped during processing for congestion control or by the |
| 2435 | * protocol layers. |
| 2436 | * |
| 2437 | * return values: |
| 2438 | * NET_RX_SUCCESS (no congestion) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2439 | * NET_RX_DROP (packet was dropped) |
| 2440 | * |
| 2441 | */ |
| 2442 | |
| 2443 | int netif_rx(struct sk_buff *skb) |
| 2444 | { |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2445 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | |
| 2447 | /* if netpoll wants it, pretend we never saw it */ |
| 2448 | if (netpoll_rx(skb)) |
| 2449 | return NET_RX_DROP; |
| 2450 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2451 | if (!skb->tstamp.tv64) |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 2452 | net_timestamp(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2453 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 2454 | #ifdef CONFIG_RPS |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2455 | { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2456 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2457 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2459 | rcu_read_lock(); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2460 | |
| 2461 | cpu = get_rps_cpu(skb->dev, skb, &rflow); |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2462 | if (cpu < 0) |
| 2463 | cpu = smp_processor_id(); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2464 | |
| 2465 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
| 2466 | |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2467 | rcu_read_unlock(); |
| 2468 | } |
| 2469 | #else |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2470 | { |
| 2471 | unsigned int qtail; |
| 2472 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); |
| 2473 | put_cpu(); |
| 2474 | } |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2475 | #endif |
| 2476 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2478 | EXPORT_SYMBOL(netif_rx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2479 | |
| 2480 | int netif_rx_ni(struct sk_buff *skb) |
| 2481 | { |
| 2482 | int err; |
| 2483 | |
| 2484 | preempt_disable(); |
| 2485 | err = netif_rx(skb); |
| 2486 | if (local_softirq_pending()) |
| 2487 | do_softirq(); |
| 2488 | preempt_enable(); |
| 2489 | |
| 2490 | return err; |
| 2491 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2492 | EXPORT_SYMBOL(netif_rx_ni); |
| 2493 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2494 | static void net_tx_action(struct softirq_action *h) |
| 2495 | { |
| 2496 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
| 2497 | |
| 2498 | if (sd->completion_queue) { |
| 2499 | struct sk_buff *clist; |
| 2500 | |
| 2501 | local_irq_disable(); |
| 2502 | clist = sd->completion_queue; |
| 2503 | sd->completion_queue = NULL; |
| 2504 | local_irq_enable(); |
| 2505 | |
| 2506 | while (clist) { |
| 2507 | struct sk_buff *skb = clist; |
| 2508 | clist = clist->next; |
| 2509 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 2510 | WARN_ON(atomic_read(&skb->users)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2511 | __kfree_skb(skb); |
| 2512 | } |
| 2513 | } |
| 2514 | |
| 2515 | if (sd->output_queue) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2516 | struct Qdisc *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | |
| 2518 | local_irq_disable(); |
| 2519 | head = sd->output_queue; |
| 2520 | sd->output_queue = NULL; |
| 2521 | local_irq_enable(); |
| 2522 | |
| 2523 | while (head) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2524 | struct Qdisc *q = head; |
| 2525 | spinlock_t *root_lock; |
| 2526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2527 | head = head->next_sched; |
| 2528 | |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 2529 | root_lock = qdisc_lock(q); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2530 | if (spin_trylock(root_lock)) { |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 2531 | smp_mb__before_clear_bit(); |
| 2532 | clear_bit(__QDISC_STATE_SCHED, |
| 2533 | &q->state); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2534 | qdisc_run(q); |
| 2535 | spin_unlock(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2536 | } else { |
David S. Miller | 195648b | 2008-08-19 04:00:36 -0700 | [diff] [blame] | 2537 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
Jarek Poplawski | e8a83e1 | 2008-09-07 18:41:21 -0700 | [diff] [blame] | 2538 | &q->state)) { |
David S. Miller | 195648b | 2008-08-19 04:00:36 -0700 | [diff] [blame] | 2539 | __netif_reschedule(q); |
Jarek Poplawski | e8a83e1 | 2008-09-07 18:41:21 -0700 | [diff] [blame] | 2540 | } else { |
| 2541 | smp_mb__before_clear_bit(); |
| 2542 | clear_bit(__QDISC_STATE_SCHED, |
| 2543 | &q->state); |
| 2544 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2545 | } |
| 2546 | } |
| 2547 | } |
| 2548 | } |
| 2549 | |
Stephen Hemminger | 6f05f62 | 2007-03-08 20:46:03 -0800 | [diff] [blame] | 2550 | static inline int deliver_skb(struct sk_buff *skb, |
| 2551 | struct packet_type *pt_prev, |
| 2552 | struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2553 | { |
| 2554 | atomic_inc(&skb->users); |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2555 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2556 | } |
| 2557 | |
| 2558 | #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE) |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 2559 | |
| 2560 | #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE) |
| 2561 | /* This hook is defined here for ATM LANE */ |
| 2562 | int (*br_fdb_test_addr_hook)(struct net_device *dev, |
| 2563 | unsigned char *addr) __read_mostly; |
Stephen Hemminger | 4fb019a | 2009-09-11 11:50:08 -0700 | [diff] [blame] | 2564 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 2565 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2566 | |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2567 | /* |
| 2568 | * If bridge module is loaded call bridging hook. |
| 2569 | * returns NULL if packet was consumed. |
| 2570 | */ |
| 2571 | struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p, |
| 2572 | struct sk_buff *skb) __read_mostly; |
Stephen Hemminger | 4fb019a | 2009-09-11 11:50:08 -0700 | [diff] [blame] | 2573 | EXPORT_SYMBOL_GPL(br_handle_frame_hook); |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 2574 | |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2575 | static inline struct sk_buff *handle_bridge(struct sk_buff *skb, |
| 2576 | struct packet_type **pt_prev, int *ret, |
| 2577 | struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2578 | { |
| 2579 | struct net_bridge_port *port; |
| 2580 | |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2581 | if (skb->pkt_type == PACKET_LOOPBACK || |
| 2582 | (port = rcu_dereference(skb->dev->br_port)) == NULL) |
| 2583 | return skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2584 | |
| 2585 | if (*pt_prev) { |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2586 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2587 | *pt_prev = NULL; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2588 | } |
| 2589 | |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2590 | return br_handle_frame_hook(port, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2591 | } |
| 2592 | #else |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2593 | #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2594 | #endif |
| 2595 | |
Patrick McHardy | b863ceb | 2007-07-14 18:55:06 -0700 | [diff] [blame] | 2596 | #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE) |
| 2597 | struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly; |
| 2598 | EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook); |
| 2599 | |
| 2600 | static inline struct sk_buff *handle_macvlan(struct sk_buff *skb, |
| 2601 | struct packet_type **pt_prev, |
| 2602 | int *ret, |
| 2603 | struct net_device *orig_dev) |
| 2604 | { |
| 2605 | if (skb->dev->macvlan_port == NULL) |
| 2606 | return skb; |
| 2607 | |
| 2608 | if (*pt_prev) { |
| 2609 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
| 2610 | *pt_prev = NULL; |
| 2611 | } |
| 2612 | return macvlan_handle_frame_hook(skb); |
| 2613 | } |
| 2614 | #else |
| 2615 | #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb) |
| 2616 | #endif |
| 2617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2618 | #ifdef CONFIG_NET_CLS_ACT |
| 2619 | /* TODO: Maybe we should just force sch_ingress to be compiled in |
| 2620 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions |
| 2621 | * a compare and 2 stores extra right now if we dont have it on |
| 2622 | * but have CONFIG_NET_CLS_ACT |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2623 | * NOTE: This doesnt stop any functionality; if you dont have |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2624 | * the ingress scheduler, you just cant add policies on ingress. |
| 2625 | * |
| 2626 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2627 | static int ing_filter(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2628 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2629 | struct net_device *dev = skb->dev; |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2630 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
David S. Miller | 555353c | 2008-07-08 17:33:13 -0700 | [diff] [blame] | 2631 | struct netdev_queue *rxq; |
| 2632 | int result = TC_ACT_OK; |
| 2633 | struct Qdisc *q; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2634 | |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2635 | if (MAX_RED_LOOP < ttl++) { |
| 2636 | printk(KERN_WARNING |
| 2637 | "Redir loop detected Dropping packet (%d->%d)\n", |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 2638 | skb->skb_iif, dev->ifindex); |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2639 | return TC_ACT_SHOT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2640 | } |
| 2641 | |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2642 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
| 2643 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); |
| 2644 | |
David S. Miller | 555353c | 2008-07-08 17:33:13 -0700 | [diff] [blame] | 2645 | rxq = &dev->rx_queue; |
| 2646 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 2647 | q = rxq->qdisc; |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 2648 | if (q != &noop_qdisc) { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 2649 | spin_lock(qdisc_lock(q)); |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 2650 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
| 2651 | result = qdisc_enqueue_root(skb, q); |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 2652 | spin_unlock(qdisc_lock(q)); |
| 2653 | } |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2654 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2655 | return result; |
| 2656 | } |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2657 | |
| 2658 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
| 2659 | struct packet_type **pt_prev, |
| 2660 | int *ret, struct net_device *orig_dev) |
| 2661 | { |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 2662 | if (skb->dev->rx_queue.qdisc == &noop_qdisc) |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2663 | goto out; |
| 2664 | |
| 2665 | if (*pt_prev) { |
| 2666 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
| 2667 | *pt_prev = NULL; |
| 2668 | } else { |
| 2669 | /* Huh? Why does turning on AF_PACKET affect this? */ |
| 2670 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); |
| 2671 | } |
| 2672 | |
| 2673 | switch (ing_filter(skb)) { |
| 2674 | case TC_ACT_SHOT: |
| 2675 | case TC_ACT_STOLEN: |
| 2676 | kfree_skb(skb); |
| 2677 | return NULL; |
| 2678 | } |
| 2679 | |
| 2680 | out: |
| 2681 | skb->tc_verd = 0; |
| 2682 | return skb; |
| 2683 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2684 | #endif |
| 2685 | |
Patrick McHardy | bc1d041 | 2008-07-14 22:49:30 -0700 | [diff] [blame] | 2686 | /* |
| 2687 | * netif_nit_deliver - deliver received packets to network taps |
| 2688 | * @skb: buffer |
| 2689 | * |
| 2690 | * This function is used to deliver incoming packets to network |
| 2691 | * taps. It should be used when the normal netif_receive_skb path |
| 2692 | * is bypassed, for example because of VLAN acceleration. |
| 2693 | */ |
| 2694 | void netif_nit_deliver(struct sk_buff *skb) |
| 2695 | { |
| 2696 | struct packet_type *ptype; |
| 2697 | |
| 2698 | if (list_empty(&ptype_all)) |
| 2699 | return; |
| 2700 | |
| 2701 | skb_reset_network_header(skb); |
| 2702 | skb_reset_transport_header(skb); |
| 2703 | skb->mac_len = skb->network_header - skb->mac_header; |
| 2704 | |
| 2705 | rcu_read_lock(); |
| 2706 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
| 2707 | if (!ptype->dev || ptype->dev == skb->dev) |
| 2708 | deliver_skb(skb, ptype, skb->dev); |
| 2709 | } |
| 2710 | rcu_read_unlock(); |
| 2711 | } |
| 2712 | |
Eric Dumazet | acbbc07 | 2010-04-11 06:56:11 +0000 | [diff] [blame] | 2713 | static inline void skb_bond_set_mac_by_master(struct sk_buff *skb, |
| 2714 | struct net_device *master) |
| 2715 | { |
| 2716 | if (skb->pkt_type == PACKET_HOST) { |
| 2717 | u16 *dest = (u16 *) eth_hdr(skb)->h_dest; |
| 2718 | |
| 2719 | memcpy(dest, master->dev_addr, ETH_ALEN); |
| 2720 | } |
| 2721 | } |
| 2722 | |
| 2723 | /* On bonding slaves other than the currently active slave, suppress |
| 2724 | * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and |
| 2725 | * ARP on active-backup slaves with arp_validate enabled. |
| 2726 | */ |
| 2727 | int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master) |
| 2728 | { |
| 2729 | struct net_device *dev = skb->dev; |
| 2730 | |
| 2731 | if (master->priv_flags & IFF_MASTER_ARPMON) |
| 2732 | dev->last_rx = jiffies; |
| 2733 | |
| 2734 | if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) { |
| 2735 | /* Do address unmangle. The local destination address |
| 2736 | * will be always the one master has. Provides the right |
| 2737 | * functionality in a bridge. |
| 2738 | */ |
| 2739 | skb_bond_set_mac_by_master(skb, master); |
| 2740 | } |
| 2741 | |
| 2742 | if (dev->priv_flags & IFF_SLAVE_INACTIVE) { |
| 2743 | if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && |
| 2744 | skb->protocol == __cpu_to_be16(ETH_P_ARP)) |
| 2745 | return 0; |
| 2746 | |
| 2747 | if (master->priv_flags & IFF_MASTER_ALB) { |
| 2748 | if (skb->pkt_type != PACKET_BROADCAST && |
| 2749 | skb->pkt_type != PACKET_MULTICAST) |
| 2750 | return 0; |
| 2751 | } |
| 2752 | if (master->priv_flags & IFF_MASTER_8023AD && |
| 2753 | skb->protocol == __cpu_to_be16(ETH_P_SLOW)) |
| 2754 | return 0; |
| 2755 | |
| 2756 | return 1; |
| 2757 | } |
| 2758 | return 0; |
| 2759 | } |
| 2760 | EXPORT_SYMBOL(__skb_bond_should_drop); |
| 2761 | |
Eric Dumazet | 10f744d | 2010-03-28 23:07:20 -0700 | [diff] [blame] | 2762 | static int __netif_receive_skb(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2763 | { |
| 2764 | struct packet_type *ptype, *pt_prev; |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2765 | struct net_device *orig_dev; |
Eric Dumazet | 0641e4f | 2010-03-18 21:16:45 -0700 | [diff] [blame] | 2766 | struct net_device *master; |
Joe Eykholt | 0d7a368 | 2008-07-02 18:22:01 -0700 | [diff] [blame] | 2767 | struct net_device *null_or_orig; |
Andy Gospodarek | ca8d9ea | 2010-01-06 12:56:37 +0000 | [diff] [blame] | 2768 | struct net_device *null_or_bond; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2769 | int ret = NET_RX_DROP; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 2770 | __be16 type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2771 | |
Eric Dumazet | 81bbb3d | 2009-09-30 16:42:42 -0700 | [diff] [blame] | 2772 | if (!skb->tstamp.tv64) |
| 2773 | net_timestamp(skb); |
| 2774 | |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 2775 | if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb)) |
Patrick McHardy | 9b22ea5 | 2008-11-04 14:49:57 -0800 | [diff] [blame] | 2776 | return NET_RX_SUCCESS; |
| 2777 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2778 | /* if we've gotten here through NAPI, check netpoll */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2779 | if (netpoll_receive_skb(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2780 | return NET_RX_DROP; |
| 2781 | |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 2782 | if (!skb->skb_iif) |
| 2783 | skb->skb_iif = skb->dev->ifindex; |
David S. Miller | 86e65da | 2005-08-09 19:36:29 -0700 | [diff] [blame] | 2784 | |
Joe Eykholt | 0d7a368 | 2008-07-02 18:22:01 -0700 | [diff] [blame] | 2785 | null_or_orig = NULL; |
Joe Eykholt | cc9bd5c | 2008-07-02 18:22:00 -0700 | [diff] [blame] | 2786 | orig_dev = skb->dev; |
Eric Dumazet | 0641e4f | 2010-03-18 21:16:45 -0700 | [diff] [blame] | 2787 | master = ACCESS_ONCE(orig_dev->master); |
| 2788 | if (master) { |
| 2789 | if (skb_bond_should_drop(skb, master)) |
Joe Eykholt | 0d7a368 | 2008-07-02 18:22:01 -0700 | [diff] [blame] | 2790 | null_or_orig = orig_dev; /* deliver only exact match */ |
| 2791 | else |
Eric Dumazet | 0641e4f | 2010-03-18 21:16:45 -0700 | [diff] [blame] | 2792 | skb->dev = master; |
Joe Eykholt | cc9bd5c | 2008-07-02 18:22:00 -0700 | [diff] [blame] | 2793 | } |
Jay Vosburgh | 8f903c7 | 2006-02-21 16:36:44 -0800 | [diff] [blame] | 2794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2795 | __get_cpu_var(netdev_rx_stat).total++; |
| 2796 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 2797 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 2798 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 2799 | skb->mac_len = skb->network_header - skb->mac_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2800 | |
| 2801 | pt_prev = NULL; |
| 2802 | |
| 2803 | rcu_read_lock(); |
| 2804 | |
| 2805 | #ifdef CONFIG_NET_CLS_ACT |
| 2806 | if (skb->tc_verd & TC_NCLS) { |
| 2807 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); |
| 2808 | goto ncls; |
| 2809 | } |
| 2810 | #endif |
| 2811 | |
| 2812 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
Joe Eykholt | f982307 | 2008-07-02 18:22:02 -0700 | [diff] [blame] | 2813 | if (ptype->dev == null_or_orig || ptype->dev == skb->dev || |
| 2814 | ptype->dev == orig_dev) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2815 | if (pt_prev) |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2816 | ret = deliver_skb(skb, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2817 | pt_prev = ptype; |
| 2818 | } |
| 2819 | } |
| 2820 | |
| 2821 | #ifdef CONFIG_NET_CLS_ACT |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2822 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
| 2823 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2824 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2825 | ncls: |
| 2826 | #endif |
| 2827 | |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2828 | skb = handle_bridge(skb, &pt_prev, &ret, orig_dev); |
| 2829 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2830 | goto out; |
Patrick McHardy | b863ceb | 2007-07-14 18:55:06 -0700 | [diff] [blame] | 2831 | skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev); |
| 2832 | if (!skb) |
| 2833 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2834 | |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 2835 | /* |
| 2836 | * Make sure frames received on VLAN interfaces stacked on |
| 2837 | * bonding interfaces still make their way to any base bonding |
| 2838 | * device that may have registered for a specific ptype. The |
| 2839 | * handler may have to adjust skb->dev and orig_dev. |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 2840 | */ |
Andy Gospodarek | ca8d9ea | 2010-01-06 12:56:37 +0000 | [diff] [blame] | 2841 | null_or_bond = NULL; |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 2842 | if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) && |
| 2843 | (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) { |
Andy Gospodarek | ca8d9ea | 2010-01-06 12:56:37 +0000 | [diff] [blame] | 2844 | null_or_bond = vlan_dev_real_dev(skb->dev); |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 2845 | } |
| 2846 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2847 | type = skb->protocol; |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 2848 | list_for_each_entry_rcu(ptype, |
| 2849 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 2850 | if (ptype->type == type && (ptype->dev == null_or_orig || |
Andy Gospodarek | ca8d9ea | 2010-01-06 12:56:37 +0000 | [diff] [blame] | 2851 | ptype->dev == skb->dev || ptype->dev == orig_dev || |
| 2852 | ptype->dev == null_or_bond)) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2853 | if (pt_prev) |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2854 | ret = deliver_skb(skb, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2855 | pt_prev = ptype; |
| 2856 | } |
| 2857 | } |
| 2858 | |
| 2859 | if (pt_prev) { |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2860 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2861 | } else { |
| 2862 | kfree_skb(skb); |
| 2863 | /* Jamal, now you will not able to escape explaining |
| 2864 | * me how you were going to use this. :-) |
| 2865 | */ |
| 2866 | ret = NET_RX_DROP; |
| 2867 | } |
| 2868 | |
| 2869 | out: |
| 2870 | rcu_read_unlock(); |
| 2871 | return ret; |
| 2872 | } |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2873 | |
| 2874 | /** |
| 2875 | * netif_receive_skb - process receive buffer from network |
| 2876 | * @skb: buffer to process |
| 2877 | * |
| 2878 | * netif_receive_skb() is the main receive data processing function. |
| 2879 | * It always succeeds. The buffer may be dropped during processing |
| 2880 | * for congestion control or by the protocol layers. |
| 2881 | * |
| 2882 | * This function may only be called from softirq context and interrupts |
| 2883 | * should be enabled. |
| 2884 | * |
| 2885 | * Return values (usually ignored): |
| 2886 | * NET_RX_SUCCESS: no congestion |
| 2887 | * NET_RX_DROP: packet was dropped |
| 2888 | */ |
| 2889 | int netif_receive_skb(struct sk_buff *skb) |
| 2890 | { |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 2891 | #ifdef CONFIG_RPS |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2892 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
| 2893 | int cpu, ret; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2894 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2895 | rcu_read_lock(); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2896 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2897 | cpu = get_rps_cpu(skb->dev, skb, &rflow); |
| 2898 | |
| 2899 | if (cpu >= 0) { |
| 2900 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
| 2901 | rcu_read_unlock(); |
| 2902 | } else { |
| 2903 | rcu_read_unlock(); |
| 2904 | ret = __netif_receive_skb(skb); |
| 2905 | } |
| 2906 | |
| 2907 | return ret; |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 2908 | #else |
| 2909 | return __netif_receive_skb(skb); |
| 2910 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2911 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2912 | EXPORT_SYMBOL(netif_receive_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2913 | |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2914 | /* Network device is going away, flush any packets still pending */ |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2915 | static void flush_backlog(void *arg) |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2916 | { |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2917 | struct net_device *dev = arg; |
| 2918 | struct softnet_data *queue = &__get_cpu_var(softnet_data); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2919 | struct sk_buff *skb, *tmp; |
| 2920 | |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2921 | rps_lock(queue); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2922 | skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp) |
| 2923 | if (skb->dev == dev) { |
| 2924 | __skb_unlink(skb, &queue->input_pkt_queue); |
| 2925 | kfree_skb(skb); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 2926 | incr_input_queue_head(queue); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2927 | } |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2928 | rps_unlock(queue); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2929 | } |
| 2930 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2931 | static int napi_gro_complete(struct sk_buff *skb) |
| 2932 | { |
| 2933 | struct packet_type *ptype; |
| 2934 | __be16 type = skb->protocol; |
| 2935 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; |
| 2936 | int err = -ENOENT; |
| 2937 | |
Herbert Xu | fc59f9a | 2009-04-14 15:11:06 -0700 | [diff] [blame] | 2938 | if (NAPI_GRO_CB(skb)->count == 1) { |
| 2939 | skb_shinfo(skb)->gso_size = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2940 | goto out; |
Herbert Xu | fc59f9a | 2009-04-14 15:11:06 -0700 | [diff] [blame] | 2941 | } |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2942 | |
| 2943 | rcu_read_lock(); |
| 2944 | list_for_each_entry_rcu(ptype, head, list) { |
| 2945 | if (ptype->type != type || ptype->dev || !ptype->gro_complete) |
| 2946 | continue; |
| 2947 | |
| 2948 | err = ptype->gro_complete(skb); |
| 2949 | break; |
| 2950 | } |
| 2951 | rcu_read_unlock(); |
| 2952 | |
| 2953 | if (err) { |
| 2954 | WARN_ON(&ptype->list == head); |
| 2955 | kfree_skb(skb); |
| 2956 | return NET_RX_SUCCESS; |
| 2957 | } |
| 2958 | |
| 2959 | out: |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2960 | return netif_receive_skb(skb); |
| 2961 | } |
| 2962 | |
David S. Miller | 11380a4 | 2010-01-19 13:46:10 -0800 | [diff] [blame] | 2963 | static void napi_gro_flush(struct napi_struct *napi) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2964 | { |
| 2965 | struct sk_buff *skb, *next; |
| 2966 | |
| 2967 | for (skb = napi->gro_list; skb; skb = next) { |
| 2968 | next = skb->next; |
| 2969 | skb->next = NULL; |
| 2970 | napi_gro_complete(skb); |
| 2971 | } |
| 2972 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 2973 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2974 | napi->gro_list = NULL; |
| 2975 | } |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2976 | |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 2977 | enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2978 | { |
| 2979 | struct sk_buff **pp = NULL; |
| 2980 | struct packet_type *ptype; |
| 2981 | __be16 type = skb->protocol; |
| 2982 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 2983 | int same_flow; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2984 | int mac_len; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 2985 | enum gro_result ret; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2986 | |
| 2987 | if (!(skb->dev->features & NETIF_F_GRO)) |
| 2988 | goto normal; |
| 2989 | |
David S. Miller | 4cf704f | 2009-06-09 00:18:51 -0700 | [diff] [blame] | 2990 | if (skb_is_gso(skb) || skb_has_frags(skb)) |
Herbert Xu | f17f5c9 | 2009-01-14 14:36:12 -0800 | [diff] [blame] | 2991 | goto normal; |
| 2992 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2993 | rcu_read_lock(); |
| 2994 | list_for_each_entry_rcu(ptype, head, list) { |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2995 | if (ptype->type != type || ptype->dev || !ptype->gro_receive) |
| 2996 | continue; |
| 2997 | |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 2998 | skb_set_network_header(skb, skb_gro_offset(skb)); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2999 | mac_len = skb->network_header - skb->mac_header; |
| 3000 | skb->mac_len = mac_len; |
| 3001 | NAPI_GRO_CB(skb)->same_flow = 0; |
| 3002 | NAPI_GRO_CB(skb)->flush = 0; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3003 | NAPI_GRO_CB(skb)->free = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3004 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3005 | pp = ptype->gro_receive(&napi->gro_list, skb); |
| 3006 | break; |
| 3007 | } |
| 3008 | rcu_read_unlock(); |
| 3009 | |
| 3010 | if (&ptype->list == head) |
| 3011 | goto normal; |
| 3012 | |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3013 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3014 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3015 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3016 | if (pp) { |
| 3017 | struct sk_buff *nskb = *pp; |
| 3018 | |
| 3019 | *pp = nskb->next; |
| 3020 | nskb->next = NULL; |
| 3021 | napi_gro_complete(nskb); |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3022 | napi->gro_count--; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3023 | } |
| 3024 | |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3025 | if (same_flow) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3026 | goto ok; |
| 3027 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3028 | if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3029 | goto normal; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3030 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3031 | napi->gro_count++; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3032 | NAPI_GRO_CB(skb)->count = 1; |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3033 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3034 | skb->next = napi->gro_list; |
| 3035 | napi->gro_list = skb; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3036 | ret = GRO_HELD; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3037 | |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3038 | pull: |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 3039 | if (skb_headlen(skb) < skb_gro_offset(skb)) { |
| 3040 | int grow = skb_gro_offset(skb) - skb_headlen(skb); |
| 3041 | |
| 3042 | BUG_ON(skb->end - skb->tail < grow); |
| 3043 | |
| 3044 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); |
| 3045 | |
| 3046 | skb->tail += grow; |
| 3047 | skb->data_len -= grow; |
| 3048 | |
| 3049 | skb_shinfo(skb)->frags[0].page_offset += grow; |
| 3050 | skb_shinfo(skb)->frags[0].size -= grow; |
| 3051 | |
| 3052 | if (unlikely(!skb_shinfo(skb)->frags[0].size)) { |
| 3053 | put_page(skb_shinfo(skb)->frags[0].page); |
| 3054 | memmove(skb_shinfo(skb)->frags, |
| 3055 | skb_shinfo(skb)->frags + 1, |
| 3056 | --skb_shinfo(skb)->nr_frags); |
| 3057 | } |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3058 | } |
| 3059 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3060 | ok: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3061 | return ret; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3062 | |
| 3063 | normal: |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3064 | ret = GRO_NORMAL; |
| 3065 | goto pull; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3066 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3067 | EXPORT_SYMBOL(dev_gro_receive); |
| 3068 | |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3069 | static gro_result_t |
| 3070 | __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3071 | { |
| 3072 | struct sk_buff *p; |
| 3073 | |
Herbert Xu | d1c76af | 2009-03-16 10:50:02 -0700 | [diff] [blame] | 3074 | if (netpoll_rx_on(skb)) |
| 3075 | return GRO_NORMAL; |
| 3076 | |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3077 | for (p = napi->gro_list; p; p = p->next) { |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 3078 | NAPI_GRO_CB(p)->same_flow = |
| 3079 | (p->dev == skb->dev) && |
| 3080 | !compare_ether_header(skb_mac_header(p), |
| 3081 | skb_gro_mac_header(skb)); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3082 | NAPI_GRO_CB(p)->flush = 0; |
| 3083 | } |
| 3084 | |
| 3085 | return dev_gro_receive(napi, skb); |
| 3086 | } |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3087 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3088 | gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb) |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3089 | { |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3090 | switch (ret) { |
| 3091 | case GRO_NORMAL: |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3092 | if (netif_receive_skb(skb)) |
| 3093 | ret = GRO_DROP; |
| 3094 | break; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3095 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3096 | case GRO_DROP: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3097 | case GRO_MERGED_FREE: |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3098 | kfree_skb(skb); |
| 3099 | break; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3100 | |
| 3101 | case GRO_HELD: |
| 3102 | case GRO_MERGED: |
| 3103 | break; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3104 | } |
| 3105 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3106 | return ret; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3107 | } |
| 3108 | EXPORT_SYMBOL(napi_skb_finish); |
| 3109 | |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3110 | void skb_gro_reset_offset(struct sk_buff *skb) |
| 3111 | { |
| 3112 | NAPI_GRO_CB(skb)->data_offset = 0; |
| 3113 | NAPI_GRO_CB(skb)->frag0 = NULL; |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 3114 | NAPI_GRO_CB(skb)->frag0_len = 0; |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3115 | |
Herbert Xu | 78d3fd0 | 2009-05-26 18:50:23 +0000 | [diff] [blame] | 3116 | if (skb->mac_header == skb->tail && |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 3117 | !PageHighMem(skb_shinfo(skb)->frags[0].page)) { |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3118 | NAPI_GRO_CB(skb)->frag0 = |
| 3119 | page_address(skb_shinfo(skb)->frags[0].page) + |
| 3120 | skb_shinfo(skb)->frags[0].page_offset; |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 3121 | NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size; |
| 3122 | } |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3123 | } |
| 3124 | EXPORT_SYMBOL(skb_gro_reset_offset); |
| 3125 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3126 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3127 | { |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3128 | skb_gro_reset_offset(skb); |
| 3129 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3130 | return napi_skb_finish(__napi_gro_receive(napi, skb), skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3131 | } |
| 3132 | EXPORT_SYMBOL(napi_gro_receive); |
| 3133 | |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3134 | void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
| 3135 | { |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3136 | __skb_pull(skb, skb_headlen(skb)); |
| 3137 | skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb)); |
| 3138 | |
| 3139 | napi->skb = skb; |
| 3140 | } |
| 3141 | EXPORT_SYMBOL(napi_reuse_skb); |
| 3142 | |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3143 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3144 | { |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3145 | struct sk_buff *skb = napi->skb; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3146 | |
| 3147 | if (!skb) { |
Eric Dumazet | 89d71a6 | 2009-10-13 05:34:20 +0000 | [diff] [blame] | 3148 | skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD); |
| 3149 | if (skb) |
| 3150 | napi->skb = skb; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3151 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3152 | return skb; |
| 3153 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3154 | EXPORT_SYMBOL(napi_get_frags); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3155 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3156 | gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, |
| 3157 | gro_result_t ret) |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3158 | { |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3159 | switch (ret) { |
| 3160 | case GRO_NORMAL: |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3161 | case GRO_HELD: |
Ajit Khaparde | e76b69c | 2010-02-16 20:25:43 +0000 | [diff] [blame] | 3162 | skb->protocol = eth_type_trans(skb, skb->dev); |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3163 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3164 | if (ret == GRO_HELD) |
| 3165 | skb_gro_pull(skb, -ETH_HLEN); |
| 3166 | else if (netif_receive_skb(skb)) |
| 3167 | ret = GRO_DROP; |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3168 | break; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3169 | |
| 3170 | case GRO_DROP: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3171 | case GRO_MERGED_FREE: |
| 3172 | napi_reuse_skb(napi, skb); |
| 3173 | break; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3174 | |
| 3175 | case GRO_MERGED: |
| 3176 | break; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3177 | } |
| 3178 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3179 | return ret; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3180 | } |
| 3181 | EXPORT_SYMBOL(napi_frags_finish); |
| 3182 | |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3183 | struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3184 | { |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3185 | struct sk_buff *skb = napi->skb; |
| 3186 | struct ethhdr *eth; |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 3187 | unsigned int hlen; |
| 3188 | unsigned int off; |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3189 | |
| 3190 | napi->skb = NULL; |
| 3191 | |
| 3192 | skb_reset_mac_header(skb); |
| 3193 | skb_gro_reset_offset(skb); |
| 3194 | |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 3195 | off = skb_gro_offset(skb); |
| 3196 | hlen = off + sizeof(*eth); |
| 3197 | eth = skb_gro_header_fast(skb, off); |
| 3198 | if (skb_gro_header_hard(skb, hlen)) { |
| 3199 | eth = skb_gro_header_slow(skb, hlen, off); |
| 3200 | if (unlikely(!eth)) { |
| 3201 | napi_reuse_skb(napi, skb); |
| 3202 | skb = NULL; |
| 3203 | goto out; |
| 3204 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3205 | } |
| 3206 | |
| 3207 | skb_gro_pull(skb, sizeof(*eth)); |
| 3208 | |
| 3209 | /* |
| 3210 | * This works because the only protocols we care about don't require |
| 3211 | * special handling. We'll fix it up properly at the end. |
| 3212 | */ |
| 3213 | skb->protocol = eth->h_proto; |
| 3214 | |
| 3215 | out: |
| 3216 | return skb; |
| 3217 | } |
| 3218 | EXPORT_SYMBOL(napi_frags_skb); |
| 3219 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3220 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3221 | { |
| 3222 | struct sk_buff *skb = napi_frags_skb(napi); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3223 | |
| 3224 | if (!skb) |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3225 | return GRO_DROP; |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3226 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3227 | return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb)); |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3228 | } |
| 3229 | EXPORT_SYMBOL(napi_gro_frags); |
| 3230 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3231 | static int process_backlog(struct napi_struct *napi, int quota) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3232 | { |
| 3233 | int work = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3234 | struct softnet_data *queue = &__get_cpu_var(softnet_data); |
| 3235 | unsigned long start_time = jiffies; |
| 3236 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3237 | napi->weight = weight_p; |
| 3238 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3239 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3240 | |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 3241 | local_irq_disable(); |
| 3242 | rps_lock(queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3243 | skb = __skb_dequeue(&queue->input_pkt_queue); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3244 | if (!skb) { |
Herbert Xu | 8f1ead2 | 2009-03-26 00:59:10 -0700 | [diff] [blame] | 3245 | __napi_complete(napi); |
Tom Herbert | 5a6d234 | 2010-04-05 14:37:19 -0700 | [diff] [blame] | 3246 | rps_unlock(queue); |
Eric Dumazet | e400827 | 2010-04-05 15:42:39 -0700 | [diff] [blame] | 3247 | local_irq_enable(); |
Herbert Xu | 8f1ead2 | 2009-03-26 00:59:10 -0700 | [diff] [blame] | 3248 | break; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3249 | } |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 3250 | incr_input_queue_head(queue); |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 3251 | rps_unlock(queue); |
| 3252 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3253 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3254 | __netif_receive_skb(skb); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3255 | } while (++work < quota && jiffies == start_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3256 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3257 | return work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3258 | } |
| 3259 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3260 | /** |
| 3261 | * __napi_schedule - schedule for receive |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 3262 | * @n: entry to schedule |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3263 | * |
| 3264 | * The entry's receive function will be scheduled to run |
| 3265 | */ |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 3266 | void __napi_schedule(struct napi_struct *n) |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3267 | { |
| 3268 | unsigned long flags; |
| 3269 | |
| 3270 | local_irq_save(flags); |
| 3271 | list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list); |
| 3272 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 3273 | local_irq_restore(flags); |
| 3274 | } |
| 3275 | EXPORT_SYMBOL(__napi_schedule); |
| 3276 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3277 | void __napi_complete(struct napi_struct *n) |
| 3278 | { |
| 3279 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); |
| 3280 | BUG_ON(n->gro_list); |
| 3281 | |
| 3282 | list_del(&n->poll_list); |
| 3283 | smp_mb__before_clear_bit(); |
| 3284 | clear_bit(NAPI_STATE_SCHED, &n->state); |
| 3285 | } |
| 3286 | EXPORT_SYMBOL(__napi_complete); |
| 3287 | |
| 3288 | void napi_complete(struct napi_struct *n) |
| 3289 | { |
| 3290 | unsigned long flags; |
| 3291 | |
| 3292 | /* |
| 3293 | * don't let napi dequeue from the cpu poll list |
| 3294 | * just in case its running on a different cpu |
| 3295 | */ |
| 3296 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) |
| 3297 | return; |
| 3298 | |
| 3299 | napi_gro_flush(n); |
| 3300 | local_irq_save(flags); |
| 3301 | __napi_complete(n); |
| 3302 | local_irq_restore(flags); |
| 3303 | } |
| 3304 | EXPORT_SYMBOL(napi_complete); |
| 3305 | |
| 3306 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
| 3307 | int (*poll)(struct napi_struct *, int), int weight) |
| 3308 | { |
| 3309 | INIT_LIST_HEAD(&napi->poll_list); |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3310 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3311 | napi->gro_list = NULL; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3312 | napi->skb = NULL; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3313 | napi->poll = poll; |
| 3314 | napi->weight = weight; |
| 3315 | list_add(&napi->dev_list, &dev->napi_list); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3316 | napi->dev = dev; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3317 | #ifdef CONFIG_NETPOLL |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3318 | spin_lock_init(&napi->poll_lock); |
| 3319 | napi->poll_owner = -1; |
| 3320 | #endif |
| 3321 | set_bit(NAPI_STATE_SCHED, &napi->state); |
| 3322 | } |
| 3323 | EXPORT_SYMBOL(netif_napi_add); |
| 3324 | |
| 3325 | void netif_napi_del(struct napi_struct *napi) |
| 3326 | { |
| 3327 | struct sk_buff *skb, *next; |
| 3328 | |
Peter P Waskiewicz Jr | d7b0663 | 2008-12-26 01:35:35 -0800 | [diff] [blame] | 3329 | list_del_init(&napi->dev_list); |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3330 | napi_free_frags(napi); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3331 | |
| 3332 | for (skb = napi->gro_list; skb; skb = next) { |
| 3333 | next = skb->next; |
| 3334 | skb->next = NULL; |
| 3335 | kfree_skb(skb); |
| 3336 | } |
| 3337 | |
| 3338 | napi->gro_list = NULL; |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3339 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3340 | } |
| 3341 | EXPORT_SYMBOL(netif_napi_del); |
| 3342 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 3343 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3344 | /* |
| 3345 | * net_rps_action sends any pending IPI's for rps. This is only called from |
| 3346 | * softirq and interrupts must be enabled. |
| 3347 | */ |
| 3348 | static void net_rps_action(cpumask_t *mask) |
| 3349 | { |
| 3350 | int cpu; |
| 3351 | |
| 3352 | /* Send pending IPI's to kick RPS processing on remote cpus. */ |
| 3353 | for_each_cpu_mask_nr(cpu, *mask) { |
| 3354 | struct softnet_data *queue = &per_cpu(softnet_data, cpu); |
| 3355 | if (cpu_online(cpu)) |
| 3356 | __smp_call_function_single(cpu, &queue->csd, 0); |
| 3357 | } |
| 3358 | cpus_clear(*mask); |
| 3359 | } |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 3360 | #endif |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3361 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3362 | static void net_rx_action(struct softirq_action *h) |
| 3363 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3364 | struct list_head *list = &__get_cpu_var(softnet_data).poll_list; |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 3365 | unsigned long time_limit = jiffies + 2; |
Stephen Hemminger | 51b0bde | 2005-06-23 20:14:40 -0700 | [diff] [blame] | 3366 | int budget = netdev_budget; |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 3367 | void *have; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 3368 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3369 | int select; |
| 3370 | struct rps_remote_softirq_cpus *rcpus; |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 3371 | #endif |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 3372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3373 | local_irq_disable(); |
| 3374 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3375 | while (!list_empty(list)) { |
| 3376 | struct napi_struct *n; |
| 3377 | int work, weight; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3378 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3379 | /* If softirq window is exhuasted then punt. |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 3380 | * Allow this to run for 2 jiffies since which will allow |
| 3381 | * an average latency of 1.5/HZ. |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3382 | */ |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 3383 | if (unlikely(budget <= 0 || time_after(jiffies, time_limit))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3384 | goto softnet_break; |
| 3385 | |
| 3386 | local_irq_enable(); |
| 3387 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3388 | /* Even though interrupts have been re-enabled, this |
| 3389 | * access is safe because interrupts can only add new |
| 3390 | * entries to the tail of this list, and only ->poll() |
| 3391 | * calls can remove this head entry from the list. |
| 3392 | */ |
stephen hemminger | e5e26d7 | 2010-02-24 14:01:38 +0000 | [diff] [blame] | 3393 | n = list_first_entry(list, struct napi_struct, poll_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3394 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3395 | have = netpoll_poll_lock(n); |
| 3396 | |
| 3397 | weight = n->weight; |
| 3398 | |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 3399 | /* This NAPI_STATE_SCHED test is for avoiding a race |
| 3400 | * with netpoll's poll_napi(). Only the entity which |
| 3401 | * obtains the lock and sees NAPI_STATE_SCHED set will |
| 3402 | * actually make the ->poll() call. Therefore we avoid |
| 3403 | * accidently calling ->poll() when NAPI is not scheduled. |
| 3404 | */ |
| 3405 | work = 0; |
Neil Horman | 4ea7e38 | 2009-05-21 07:36:08 +0000 | [diff] [blame] | 3406 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 3407 | work = n->poll(n, weight); |
Neil Horman | 4ea7e38 | 2009-05-21 07:36:08 +0000 | [diff] [blame] | 3408 | trace_napi_poll(n); |
| 3409 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3410 | |
| 3411 | WARN_ON_ONCE(work > weight); |
| 3412 | |
| 3413 | budget -= work; |
| 3414 | |
| 3415 | local_irq_disable(); |
| 3416 | |
| 3417 | /* Drivers must not modify the NAPI state if they |
| 3418 | * consume the entire weight. In such cases this code |
| 3419 | * still "owns" the NAPI instance and therefore can |
| 3420 | * move the instance around on the list at-will. |
| 3421 | */ |
David S. Miller | fed17f3 | 2008-01-07 21:00:40 -0800 | [diff] [blame] | 3422 | if (unlikely(work == weight)) { |
Herbert Xu | ff780cd | 2009-06-26 19:27:04 -0700 | [diff] [blame] | 3423 | if (unlikely(napi_disable_pending(n))) { |
| 3424 | local_irq_enable(); |
| 3425 | napi_complete(n); |
| 3426 | local_irq_disable(); |
| 3427 | } else |
David S. Miller | fed17f3 | 2008-01-07 21:00:40 -0800 | [diff] [blame] | 3428 | list_move_tail(&n->poll_list, list); |
| 3429 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3430 | |
| 3431 | netpoll_poll_unlock(have); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3432 | } |
| 3433 | out: |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 3434 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3435 | rcpus = &__get_cpu_var(rps_remote_softirq_cpus); |
| 3436 | select = rcpus->select; |
| 3437 | rcpus->select ^= 1; |
| 3438 | |
Shannon Nelson | 515e06c | 2007-06-23 23:09:23 -0700 | [diff] [blame] | 3439 | local_irq_enable(); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3440 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3441 | net_rps_action(&rcpus->mask[select]); |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 3442 | #else |
| 3443 | local_irq_enable(); |
| 3444 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3445 | |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 3446 | #ifdef CONFIG_NET_DMA |
| 3447 | /* |
| 3448 | * There may not be any more sk_buffs coming right now, so push |
| 3449 | * any pending DMA copies to hardware |
| 3450 | */ |
Dan Williams | 2ba0562 | 2009-01-06 11:38:14 -0700 | [diff] [blame] | 3451 | dma_issue_pending_all(); |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 3452 | #endif |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3454 | return; |
| 3455 | |
| 3456 | softnet_break: |
| 3457 | __get_cpu_var(netdev_rx_stat).time_squeeze++; |
| 3458 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 3459 | goto out; |
| 3460 | } |
| 3461 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3462 | static gifconf_func_t *gifconf_list[NPROTO]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3463 | |
| 3464 | /** |
| 3465 | * register_gifconf - register a SIOCGIF handler |
| 3466 | * @family: Address family |
| 3467 | * @gifconf: Function handler |
| 3468 | * |
| 3469 | * Register protocol dependent address dumping routines. The handler |
| 3470 | * that is passed must not be freed or reused until it has been replaced |
| 3471 | * by another handler. |
| 3472 | */ |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3473 | int register_gifconf(unsigned int family, gifconf_func_t *gifconf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3474 | { |
| 3475 | if (family >= NPROTO) |
| 3476 | return -EINVAL; |
| 3477 | gifconf_list[family] = gifconf; |
| 3478 | return 0; |
| 3479 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3480 | EXPORT_SYMBOL(register_gifconf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3481 | |
| 3482 | |
| 3483 | /* |
| 3484 | * Map an interface index to its name (SIOCGIFNAME) |
| 3485 | */ |
| 3486 | |
| 3487 | /* |
| 3488 | * We need this ioctl for efficient implementation of the |
| 3489 | * if_indextoname() function required by the IPv6 API. Without |
| 3490 | * it, we would have to search all the interfaces to find a |
| 3491 | * match. --pb |
| 3492 | */ |
| 3493 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3494 | static int dev_ifname(struct net *net, struct ifreq __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3495 | { |
| 3496 | struct net_device *dev; |
| 3497 | struct ifreq ifr; |
| 3498 | |
| 3499 | /* |
| 3500 | * Fetch the caller's info block. |
| 3501 | */ |
| 3502 | |
| 3503 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) |
| 3504 | return -EFAULT; |
| 3505 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 3506 | rcu_read_lock(); |
| 3507 | dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3508 | if (!dev) { |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 3509 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3510 | return -ENODEV; |
| 3511 | } |
| 3512 | |
| 3513 | strcpy(ifr.ifr_name, dev->name); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 3514 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3515 | |
| 3516 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) |
| 3517 | return -EFAULT; |
| 3518 | return 0; |
| 3519 | } |
| 3520 | |
| 3521 | /* |
| 3522 | * Perform a SIOCGIFCONF call. This structure will change |
| 3523 | * size eventually, and there is nothing I can do about it. |
| 3524 | * Thus we will need a 'compatibility mode'. |
| 3525 | */ |
| 3526 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3527 | static int dev_ifconf(struct net *net, char __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3528 | { |
| 3529 | struct ifconf ifc; |
| 3530 | struct net_device *dev; |
| 3531 | char __user *pos; |
| 3532 | int len; |
| 3533 | int total; |
| 3534 | int i; |
| 3535 | |
| 3536 | /* |
| 3537 | * Fetch the caller's info block. |
| 3538 | */ |
| 3539 | |
| 3540 | if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) |
| 3541 | return -EFAULT; |
| 3542 | |
| 3543 | pos = ifc.ifc_buf; |
| 3544 | len = ifc.ifc_len; |
| 3545 | |
| 3546 | /* |
| 3547 | * Loop over the interfaces, and write an info block for each. |
| 3548 | */ |
| 3549 | |
| 3550 | total = 0; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3551 | for_each_netdev(net, dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3552 | for (i = 0; i < NPROTO; i++) { |
| 3553 | if (gifconf_list[i]) { |
| 3554 | int done; |
| 3555 | if (!pos) |
| 3556 | done = gifconf_list[i](dev, NULL, 0); |
| 3557 | else |
| 3558 | done = gifconf_list[i](dev, pos + total, |
| 3559 | len - total); |
| 3560 | if (done < 0) |
| 3561 | return -EFAULT; |
| 3562 | total += done; |
| 3563 | } |
| 3564 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3565 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3566 | |
| 3567 | /* |
| 3568 | * All done. Write the updated control block back to the caller. |
| 3569 | */ |
| 3570 | ifc.ifc_len = total; |
| 3571 | |
| 3572 | /* |
| 3573 | * Both BSD and Solaris return 0 here, so we do too. |
| 3574 | */ |
| 3575 | return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; |
| 3576 | } |
| 3577 | |
| 3578 | #ifdef CONFIG_PROC_FS |
| 3579 | /* |
| 3580 | * This is invoked by the /proc filesystem handler to display a device |
| 3581 | * in detail. |
| 3582 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3583 | void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3584 | __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3585 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3586 | struct net *net = seq_file_net(seq); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 3587 | loff_t off; |
| 3588 | struct net_device *dev; |
| 3589 | |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3590 | rcu_read_lock(); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 3591 | if (!*pos) |
| 3592 | return SEQ_START_TOKEN; |
| 3593 | |
| 3594 | off = 1; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3595 | for_each_netdev_rcu(net, dev) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 3596 | if (off++ == *pos) |
| 3597 | return dev; |
| 3598 | |
| 3599 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3600 | } |
| 3601 | |
| 3602 | void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 3603 | { |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3604 | struct net_device *dev = (v == SEQ_START_TOKEN) ? |
| 3605 | first_net_device(seq_file_net(seq)) : |
| 3606 | next_net_device((struct net_device *)v); |
| 3607 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3608 | ++*pos; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3609 | return rcu_dereference(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3610 | } |
| 3611 | |
| 3612 | void dev_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3613 | __releases(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3614 | { |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3615 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3616 | } |
| 3617 | |
| 3618 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) |
| 3619 | { |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 3620 | const struct net_device_stats *stats = dev_get_stats(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3621 | |
Jesper Dangaard Brouer | 2d13baf | 2010-01-05 05:50:52 +0000 | [diff] [blame] | 3622 | seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu " |
Rusty Russell | 5a1b589 | 2007-04-28 21:04:03 -0700 | [diff] [blame] | 3623 | "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n", |
| 3624 | dev->name, stats->rx_bytes, stats->rx_packets, |
| 3625 | stats->rx_errors, |
| 3626 | stats->rx_dropped + stats->rx_missed_errors, |
| 3627 | stats->rx_fifo_errors, |
| 3628 | stats->rx_length_errors + stats->rx_over_errors + |
| 3629 | stats->rx_crc_errors + stats->rx_frame_errors, |
| 3630 | stats->rx_compressed, stats->multicast, |
| 3631 | stats->tx_bytes, stats->tx_packets, |
| 3632 | stats->tx_errors, stats->tx_dropped, |
| 3633 | stats->tx_fifo_errors, stats->collisions, |
| 3634 | stats->tx_carrier_errors + |
| 3635 | stats->tx_aborted_errors + |
| 3636 | stats->tx_window_errors + |
| 3637 | stats->tx_heartbeat_errors, |
| 3638 | stats->tx_compressed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3639 | } |
| 3640 | |
| 3641 | /* |
| 3642 | * Called from the PROCfs module. This now uses the new arbitrary sized |
| 3643 | * /proc/net interface to create /proc/net/dev |
| 3644 | */ |
| 3645 | static int dev_seq_show(struct seq_file *seq, void *v) |
| 3646 | { |
| 3647 | if (v == SEQ_START_TOKEN) |
| 3648 | seq_puts(seq, "Inter-| Receive " |
| 3649 | " | Transmit\n" |
| 3650 | " face |bytes packets errs drop fifo frame " |
| 3651 | "compressed multicast|bytes packets errs " |
| 3652 | "drop fifo colls carrier compressed\n"); |
| 3653 | else |
| 3654 | dev_seq_printf_stats(seq, v); |
| 3655 | return 0; |
| 3656 | } |
| 3657 | |
| 3658 | static struct netif_rx_stats *softnet_get_online(loff_t *pos) |
| 3659 | { |
| 3660 | struct netif_rx_stats *rc = NULL; |
| 3661 | |
Mike Travis | 0c0b0ac | 2008-05-02 16:43:08 -0700 | [diff] [blame] | 3662 | while (*pos < nr_cpu_ids) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3663 | if (cpu_online(*pos)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3664 | rc = &per_cpu(netdev_rx_stat, *pos); |
| 3665 | break; |
| 3666 | } else |
| 3667 | ++*pos; |
| 3668 | return rc; |
| 3669 | } |
| 3670 | |
| 3671 | static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) |
| 3672 | { |
| 3673 | return softnet_get_online(pos); |
| 3674 | } |
| 3675 | |
| 3676 | static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 3677 | { |
| 3678 | ++*pos; |
| 3679 | return softnet_get_online(pos); |
| 3680 | } |
| 3681 | |
| 3682 | static void softnet_seq_stop(struct seq_file *seq, void *v) |
| 3683 | { |
| 3684 | } |
| 3685 | |
| 3686 | static int softnet_seq_show(struct seq_file *seq, void *v) |
| 3687 | { |
| 3688 | struct netif_rx_stats *s = v; |
| 3689 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3690 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n", |
Stephen Hemminger | 31aa02c | 2005-06-23 20:12:48 -0700 | [diff] [blame] | 3691 | s->total, s->dropped, s->time_squeeze, 0, |
Stephen Hemminger | c1ebcdb | 2005-06-23 20:08:59 -0700 | [diff] [blame] | 3692 | 0, 0, 0, 0, /* was fastroute */ |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3693 | s->cpu_collision, s->received_rps); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3694 | return 0; |
| 3695 | } |
| 3696 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 3697 | static const struct seq_operations dev_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3698 | .start = dev_seq_start, |
| 3699 | .next = dev_seq_next, |
| 3700 | .stop = dev_seq_stop, |
| 3701 | .show = dev_seq_show, |
| 3702 | }; |
| 3703 | |
| 3704 | static int dev_seq_open(struct inode *inode, struct file *file) |
| 3705 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3706 | return seq_open_net(inode, file, &dev_seq_ops, |
| 3707 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3708 | } |
| 3709 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 3710 | static const struct file_operations dev_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3711 | .owner = THIS_MODULE, |
| 3712 | .open = dev_seq_open, |
| 3713 | .read = seq_read, |
| 3714 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3715 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3716 | }; |
| 3717 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 3718 | static const struct seq_operations softnet_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3719 | .start = softnet_seq_start, |
| 3720 | .next = softnet_seq_next, |
| 3721 | .stop = softnet_seq_stop, |
| 3722 | .show = softnet_seq_show, |
| 3723 | }; |
| 3724 | |
| 3725 | static int softnet_seq_open(struct inode *inode, struct file *file) |
| 3726 | { |
| 3727 | return seq_open(file, &softnet_seq_ops); |
| 3728 | } |
| 3729 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 3730 | static const struct file_operations softnet_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3731 | .owner = THIS_MODULE, |
| 3732 | .open = softnet_seq_open, |
| 3733 | .read = seq_read, |
| 3734 | .llseek = seq_lseek, |
| 3735 | .release = seq_release, |
| 3736 | }; |
| 3737 | |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3738 | static void *ptype_get_idx(loff_t pos) |
| 3739 | { |
| 3740 | struct packet_type *pt = NULL; |
| 3741 | loff_t i = 0; |
| 3742 | int t; |
| 3743 | |
| 3744 | list_for_each_entry_rcu(pt, &ptype_all, list) { |
| 3745 | if (i == pos) |
| 3746 | return pt; |
| 3747 | ++i; |
| 3748 | } |
| 3749 | |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3750 | for (t = 0; t < PTYPE_HASH_SIZE; t++) { |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3751 | list_for_each_entry_rcu(pt, &ptype_base[t], list) { |
| 3752 | if (i == pos) |
| 3753 | return pt; |
| 3754 | ++i; |
| 3755 | } |
| 3756 | } |
| 3757 | return NULL; |
| 3758 | } |
| 3759 | |
| 3760 | static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) |
Stephen Hemminger | 72348a4 | 2008-01-21 02:27:29 -0800 | [diff] [blame] | 3761 | __acquires(RCU) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3762 | { |
| 3763 | rcu_read_lock(); |
| 3764 | return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; |
| 3765 | } |
| 3766 | |
| 3767 | static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 3768 | { |
| 3769 | struct packet_type *pt; |
| 3770 | struct list_head *nxt; |
| 3771 | int hash; |
| 3772 | |
| 3773 | ++*pos; |
| 3774 | if (v == SEQ_START_TOKEN) |
| 3775 | return ptype_get_idx(0); |
| 3776 | |
| 3777 | pt = v; |
| 3778 | nxt = pt->list.next; |
| 3779 | if (pt->type == htons(ETH_P_ALL)) { |
| 3780 | if (nxt != &ptype_all) |
| 3781 | goto found; |
| 3782 | hash = 0; |
| 3783 | nxt = ptype_base[0].next; |
| 3784 | } else |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3785 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3786 | |
| 3787 | while (nxt == &ptype_base[hash]) { |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3788 | if (++hash >= PTYPE_HASH_SIZE) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3789 | return NULL; |
| 3790 | nxt = ptype_base[hash].next; |
| 3791 | } |
| 3792 | found: |
| 3793 | return list_entry(nxt, struct packet_type, list); |
| 3794 | } |
| 3795 | |
| 3796 | static void ptype_seq_stop(struct seq_file *seq, void *v) |
Stephen Hemminger | 72348a4 | 2008-01-21 02:27:29 -0800 | [diff] [blame] | 3797 | __releases(RCU) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3798 | { |
| 3799 | rcu_read_unlock(); |
| 3800 | } |
| 3801 | |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3802 | static int ptype_seq_show(struct seq_file *seq, void *v) |
| 3803 | { |
| 3804 | struct packet_type *pt = v; |
| 3805 | |
| 3806 | if (v == SEQ_START_TOKEN) |
| 3807 | seq_puts(seq, "Type Device Function\n"); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 3808 | else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) { |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3809 | if (pt->type == htons(ETH_P_ALL)) |
| 3810 | seq_puts(seq, "ALL "); |
| 3811 | else |
| 3812 | seq_printf(seq, "%04x", ntohs(pt->type)); |
| 3813 | |
Alexey Dobriyan | 908cd2d | 2008-11-16 19:50:35 -0800 | [diff] [blame] | 3814 | seq_printf(seq, " %-8s %pF\n", |
| 3815 | pt->dev ? pt->dev->name : "", pt->func); |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3816 | } |
| 3817 | |
| 3818 | return 0; |
| 3819 | } |
| 3820 | |
| 3821 | static const struct seq_operations ptype_seq_ops = { |
| 3822 | .start = ptype_seq_start, |
| 3823 | .next = ptype_seq_next, |
| 3824 | .stop = ptype_seq_stop, |
| 3825 | .show = ptype_seq_show, |
| 3826 | }; |
| 3827 | |
| 3828 | static int ptype_seq_open(struct inode *inode, struct file *file) |
| 3829 | { |
Pavel Emelyanov | 2feb27d | 2008-03-24 14:57:45 -0700 | [diff] [blame] | 3830 | return seq_open_net(inode, file, &ptype_seq_ops, |
| 3831 | sizeof(struct seq_net_private)); |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3832 | } |
| 3833 | |
| 3834 | static const struct file_operations ptype_seq_fops = { |
| 3835 | .owner = THIS_MODULE, |
| 3836 | .open = ptype_seq_open, |
| 3837 | .read = seq_read, |
| 3838 | .llseek = seq_lseek, |
Pavel Emelyanov | 2feb27d | 2008-03-24 14:57:45 -0700 | [diff] [blame] | 3839 | .release = seq_release_net, |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3840 | }; |
| 3841 | |
| 3842 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3843 | static int __net_init dev_proc_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3844 | { |
| 3845 | int rc = -ENOMEM; |
| 3846 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3847 | if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3848 | goto out; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3849 | if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3850 | goto out_dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3851 | if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops)) |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 3852 | goto out_softnet; |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3853 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3854 | if (wext_proc_init(net)) |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 3855 | goto out_ptype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3856 | rc = 0; |
| 3857 | out: |
| 3858 | return rc; |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 3859 | out_ptype: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3860 | proc_net_remove(net, "ptype"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3861 | out_softnet: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3862 | proc_net_remove(net, "softnet_stat"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3863 | out_dev: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3864 | proc_net_remove(net, "dev"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3865 | goto out; |
| 3866 | } |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3867 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3868 | static void __net_exit dev_proc_net_exit(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3869 | { |
| 3870 | wext_proc_exit(net); |
| 3871 | |
| 3872 | proc_net_remove(net, "ptype"); |
| 3873 | proc_net_remove(net, "softnet_stat"); |
| 3874 | proc_net_remove(net, "dev"); |
| 3875 | } |
| 3876 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 3877 | static struct pernet_operations __net_initdata dev_proc_ops = { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3878 | .init = dev_proc_net_init, |
| 3879 | .exit = dev_proc_net_exit, |
| 3880 | }; |
| 3881 | |
| 3882 | static int __init dev_proc_init(void) |
| 3883 | { |
| 3884 | return register_pernet_subsys(&dev_proc_ops); |
| 3885 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3886 | #else |
| 3887 | #define dev_proc_init() 0 |
| 3888 | #endif /* CONFIG_PROC_FS */ |
| 3889 | |
| 3890 | |
| 3891 | /** |
| 3892 | * netdev_set_master - set up master/slave pair |
| 3893 | * @slave: slave device |
| 3894 | * @master: new master device |
| 3895 | * |
| 3896 | * Changes the master device of the slave. Pass %NULL to break the |
| 3897 | * bonding. The caller must hold the RTNL semaphore. On a failure |
| 3898 | * a negative errno code is returned. On success the reference counts |
| 3899 | * are adjusted, %RTM_NEWLINK is sent to the routing socket and the |
| 3900 | * function returns zero. |
| 3901 | */ |
| 3902 | int netdev_set_master(struct net_device *slave, struct net_device *master) |
| 3903 | { |
| 3904 | struct net_device *old = slave->master; |
| 3905 | |
| 3906 | ASSERT_RTNL(); |
| 3907 | |
| 3908 | if (master) { |
| 3909 | if (old) |
| 3910 | return -EBUSY; |
| 3911 | dev_hold(master); |
| 3912 | } |
| 3913 | |
| 3914 | slave->master = master; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3915 | |
Eric Dumazet | 283f2fe | 2010-03-18 13:37:40 +0000 | [diff] [blame] | 3916 | if (old) { |
| 3917 | synchronize_net(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3918 | dev_put(old); |
Eric Dumazet | 283f2fe | 2010-03-18 13:37:40 +0000 | [diff] [blame] | 3919 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3920 | if (master) |
| 3921 | slave->flags |= IFF_SLAVE; |
| 3922 | else |
| 3923 | slave->flags &= ~IFF_SLAVE; |
| 3924 | |
| 3925 | rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE); |
| 3926 | return 0; |
| 3927 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3928 | EXPORT_SYMBOL(netdev_set_master); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3929 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 3930 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
| 3931 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 3932 | const struct net_device_ops *ops = dev->netdev_ops; |
| 3933 | |
| 3934 | if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags) |
| 3935 | ops->ndo_change_rx_flags(dev, flags); |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 3936 | } |
| 3937 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3938 | static int __dev_set_promiscuity(struct net_device *dev, int inc) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3939 | { |
| 3940 | unsigned short old_flags = dev->flags; |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 3941 | uid_t uid; |
| 3942 | gid_t gid; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3943 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 3944 | ASSERT_RTNL(); |
| 3945 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3946 | dev->flags |= IFF_PROMISC; |
| 3947 | dev->promiscuity += inc; |
| 3948 | if (dev->promiscuity == 0) { |
| 3949 | /* |
| 3950 | * Avoid overflow. |
| 3951 | * If inc causes overflow, untouch promisc and return error. |
| 3952 | */ |
| 3953 | if (inc < 0) |
| 3954 | dev->flags &= ~IFF_PROMISC; |
| 3955 | else { |
| 3956 | dev->promiscuity -= inc; |
| 3957 | printk(KERN_WARNING "%s: promiscuity touches roof, " |
| 3958 | "set promiscuity failed, promiscuity feature " |
| 3959 | "of device might be broken.\n", dev->name); |
| 3960 | return -EOVERFLOW; |
| 3961 | } |
| 3962 | } |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3963 | if (dev->flags != old_flags) { |
| 3964 | printk(KERN_INFO "device %s %s promiscuous mode\n", |
| 3965 | dev->name, (dev->flags & IFF_PROMISC) ? "entered" : |
| 3966 | "left"); |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 3967 | if (audit_enabled) { |
| 3968 | current_uid_gid(&uid, &gid); |
Klaus Heinrich Kiwi | 7759db8 | 2008-01-23 22:57:45 -0500 | [diff] [blame] | 3969 | audit_log(current->audit_context, GFP_ATOMIC, |
| 3970 | AUDIT_ANOM_PROMISCUOUS, |
| 3971 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", |
| 3972 | dev->name, (dev->flags & IFF_PROMISC), |
| 3973 | (old_flags & IFF_PROMISC), |
| 3974 | audit_get_loginuid(current), |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 3975 | uid, gid, |
Klaus Heinrich Kiwi | 7759db8 | 2008-01-23 22:57:45 -0500 | [diff] [blame] | 3976 | audit_get_sessionid(current)); |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 3977 | } |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 3978 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 3979 | dev_change_rx_flags(dev, IFF_PROMISC); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3980 | } |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3981 | return 0; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3982 | } |
| 3983 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3984 | /** |
| 3985 | * dev_set_promiscuity - update promiscuity count on a device |
| 3986 | * @dev: device |
| 3987 | * @inc: modifier |
| 3988 | * |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 3989 | * Add or remove promiscuity from a device. While the count in the device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3990 | * remains above zero the interface remains promiscuous. Once it hits zero |
| 3991 | * the device reverts back to normal filtering operation. A negative inc |
| 3992 | * value is used to drop promiscuity on the device. |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3993 | * Return 0 if successful or a negative errno code on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3994 | */ |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3995 | int dev_set_promiscuity(struct net_device *dev, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3996 | { |
| 3997 | unsigned short old_flags = dev->flags; |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3998 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3999 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4000 | err = __dev_set_promiscuity(dev, inc); |
Patrick McHardy | 4b5a698 | 2008-07-06 15:49:08 -0700 | [diff] [blame] | 4001 | if (err < 0) |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4002 | return err; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4003 | if (dev->flags != old_flags) |
| 4004 | dev_set_rx_mode(dev); |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4005 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4006 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4007 | EXPORT_SYMBOL(dev_set_promiscuity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4008 | |
| 4009 | /** |
| 4010 | * dev_set_allmulti - update allmulti count on a device |
| 4011 | * @dev: device |
| 4012 | * @inc: modifier |
| 4013 | * |
| 4014 | * Add or remove reception of all multicast frames to a device. While the |
| 4015 | * count in the device remains above zero the interface remains listening |
| 4016 | * to all interfaces. Once it hits zero the device reverts back to normal |
| 4017 | * filtering operation. A negative @inc value is used to drop the counter |
| 4018 | * when releasing a resource needing all multicasts. |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4019 | * Return 0 if successful or a negative errno code on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4020 | */ |
| 4021 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4022 | int dev_set_allmulti(struct net_device *dev, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4023 | { |
| 4024 | unsigned short old_flags = dev->flags; |
| 4025 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4026 | ASSERT_RTNL(); |
| 4027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4028 | dev->flags |= IFF_ALLMULTI; |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4029 | dev->allmulti += inc; |
| 4030 | if (dev->allmulti == 0) { |
| 4031 | /* |
| 4032 | * Avoid overflow. |
| 4033 | * If inc causes overflow, untouch allmulti and return error. |
| 4034 | */ |
| 4035 | if (inc < 0) |
| 4036 | dev->flags &= ~IFF_ALLMULTI; |
| 4037 | else { |
| 4038 | dev->allmulti -= inc; |
| 4039 | printk(KERN_WARNING "%s: allmulti touches roof, " |
| 4040 | "set allmulti failed, allmulti feature of " |
| 4041 | "device might be broken.\n", dev->name); |
| 4042 | return -EOVERFLOW; |
| 4043 | } |
| 4044 | } |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4045 | if (dev->flags ^ old_flags) { |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4046 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4047 | dev_set_rx_mode(dev); |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4048 | } |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4049 | return 0; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4050 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4051 | EXPORT_SYMBOL(dev_set_allmulti); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4052 | |
| 4053 | /* |
| 4054 | * Upload unicast and multicast address lists to device and |
| 4055 | * configure RX filtering. When the device doesn't support unicast |
Joe Perches | 53ccaae | 2007-12-20 14:02:06 -0800 | [diff] [blame] | 4056 | * filtering it is put in promiscuous mode while unicast addresses |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4057 | * are present. |
| 4058 | */ |
| 4059 | void __dev_set_rx_mode(struct net_device *dev) |
| 4060 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4061 | const struct net_device_ops *ops = dev->netdev_ops; |
| 4062 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4063 | /* dev_open will call this function so the list will stay sane. */ |
| 4064 | if (!(dev->flags&IFF_UP)) |
| 4065 | return; |
| 4066 | |
| 4067 | if (!netif_device_present(dev)) |
YOSHIFUJI Hideaki | 40b77c9 | 2007-07-19 10:43:23 +0900 | [diff] [blame] | 4068 | return; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4069 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4070 | if (ops->ndo_set_rx_mode) |
| 4071 | ops->ndo_set_rx_mode(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4072 | else { |
| 4073 | /* Unicast addresses changes may only happen under the rtnl, |
| 4074 | * therefore calling __dev_set_promiscuity here is safe. |
| 4075 | */ |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 4076 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4077 | __dev_set_promiscuity(dev, 1); |
| 4078 | dev->uc_promisc = 1; |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 4079 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4080 | __dev_set_promiscuity(dev, -1); |
| 4081 | dev->uc_promisc = 0; |
| 4082 | } |
| 4083 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4084 | if (ops->ndo_set_multicast_list) |
| 4085 | ops->ndo_set_multicast_list(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4086 | } |
| 4087 | } |
| 4088 | |
| 4089 | void dev_set_rx_mode(struct net_device *dev) |
| 4090 | { |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 4091 | netif_addr_lock_bh(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4092 | __dev_set_rx_mode(dev); |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 4093 | netif_addr_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4094 | } |
| 4095 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4096 | /** |
| 4097 | * dev_get_flags - get flags reported to userspace |
| 4098 | * @dev: device |
| 4099 | * |
| 4100 | * Get the combination of flag bits exported through APIs to userspace. |
| 4101 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4102 | unsigned dev_get_flags(const struct net_device *dev) |
| 4103 | { |
| 4104 | unsigned flags; |
| 4105 | |
| 4106 | flags = (dev->flags & ~(IFF_PROMISC | |
| 4107 | IFF_ALLMULTI | |
Stefan Rompf | b00055a | 2006-03-20 17:09:11 -0800 | [diff] [blame] | 4108 | IFF_RUNNING | |
| 4109 | IFF_LOWER_UP | |
| 4110 | IFF_DORMANT)) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4111 | (dev->gflags & (IFF_PROMISC | |
| 4112 | IFF_ALLMULTI)); |
| 4113 | |
Stefan Rompf | b00055a | 2006-03-20 17:09:11 -0800 | [diff] [blame] | 4114 | if (netif_running(dev)) { |
| 4115 | if (netif_oper_up(dev)) |
| 4116 | flags |= IFF_RUNNING; |
| 4117 | if (netif_carrier_ok(dev)) |
| 4118 | flags |= IFF_LOWER_UP; |
| 4119 | if (netif_dormant(dev)) |
| 4120 | flags |= IFF_DORMANT; |
| 4121 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4122 | |
| 4123 | return flags; |
| 4124 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4125 | EXPORT_SYMBOL(dev_get_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4126 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4127 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4128 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4129 | int old_flags = dev->flags; |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4130 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4131 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4132 | ASSERT_RTNL(); |
| 4133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4134 | /* |
| 4135 | * Set the flags on our device. |
| 4136 | */ |
| 4137 | |
| 4138 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | |
| 4139 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | |
| 4140 | IFF_AUTOMEDIA)) | |
| 4141 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | |
| 4142 | IFF_ALLMULTI)); |
| 4143 | |
| 4144 | /* |
| 4145 | * Load in the correct multicast list now the flags have changed. |
| 4146 | */ |
| 4147 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4148 | if ((old_flags ^ flags) & IFF_MULTICAST) |
| 4149 | dev_change_rx_flags(dev, IFF_MULTICAST); |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4150 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4151 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4152 | |
| 4153 | /* |
| 4154 | * Have we downed the interface. We handle IFF_UP ourselves |
| 4155 | * according to user attempts to set it, rather than blindly |
| 4156 | * setting it. |
| 4157 | */ |
| 4158 | |
| 4159 | ret = 0; |
| 4160 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4161 | ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4162 | |
| 4163 | if (!ret) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4164 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4165 | } |
| 4166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4167 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4168 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
| 4169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4170 | dev->gflags ^= IFF_PROMISC; |
| 4171 | dev_set_promiscuity(dev, inc); |
| 4172 | } |
| 4173 | |
| 4174 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI |
| 4175 | is important. Some (broken) drivers set IFF_PROMISC, when |
| 4176 | IFF_ALLMULTI is requested not asking us and not reporting. |
| 4177 | */ |
| 4178 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4179 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
| 4180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4181 | dev->gflags ^= IFF_ALLMULTI; |
| 4182 | dev_set_allmulti(dev, inc); |
| 4183 | } |
| 4184 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4185 | return ret; |
| 4186 | } |
| 4187 | |
| 4188 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags) |
| 4189 | { |
| 4190 | unsigned int changes = dev->flags ^ old_flags; |
| 4191 | |
| 4192 | if (changes & IFF_UP) { |
| 4193 | if (dev->flags & IFF_UP) |
| 4194 | call_netdevice_notifiers(NETDEV_UP, dev); |
| 4195 | else |
| 4196 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
| 4197 | } |
| 4198 | |
| 4199 | if (dev->flags & IFF_UP && |
| 4200 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) |
| 4201 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
| 4202 | } |
| 4203 | |
| 4204 | /** |
| 4205 | * dev_change_flags - change device settings |
| 4206 | * @dev: device |
| 4207 | * @flags: device state flags |
| 4208 | * |
| 4209 | * Change settings on device based state flags. The flags are |
| 4210 | * in the userspace exported format. |
| 4211 | */ |
| 4212 | int dev_change_flags(struct net_device *dev, unsigned flags) |
| 4213 | { |
| 4214 | int ret, changes; |
| 4215 | int old_flags = dev->flags; |
| 4216 | |
| 4217 | ret = __dev_change_flags(dev, flags); |
| 4218 | if (ret < 0) |
| 4219 | return ret; |
| 4220 | |
| 4221 | changes = old_flags ^ dev->flags; |
Thomas Graf | 7c355f5 | 2007-06-05 16:03:03 -0700 | [diff] [blame] | 4222 | if (changes) |
| 4223 | rtmsg_ifinfo(RTM_NEWLINK, dev, changes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4224 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4225 | __dev_notify_flags(dev, old_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4226 | return ret; |
| 4227 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4228 | EXPORT_SYMBOL(dev_change_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4229 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4230 | /** |
| 4231 | * dev_set_mtu - Change maximum transfer unit |
| 4232 | * @dev: device |
| 4233 | * @new_mtu: new transfer unit |
| 4234 | * |
| 4235 | * Change the maximum transfer size of the network device. |
| 4236 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4237 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
| 4238 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4239 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4240 | int err; |
| 4241 | |
| 4242 | if (new_mtu == dev->mtu) |
| 4243 | return 0; |
| 4244 | |
| 4245 | /* MTU must be positive. */ |
| 4246 | if (new_mtu < 0) |
| 4247 | return -EINVAL; |
| 4248 | |
| 4249 | if (!netif_device_present(dev)) |
| 4250 | return -ENODEV; |
| 4251 | |
| 4252 | err = 0; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4253 | if (ops->ndo_change_mtu) |
| 4254 | err = ops->ndo_change_mtu(dev, new_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4255 | else |
| 4256 | dev->mtu = new_mtu; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4258 | if (!err && dev->flags & IFF_UP) |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4259 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4260 | return err; |
| 4261 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4262 | EXPORT_SYMBOL(dev_set_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4263 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4264 | /** |
| 4265 | * dev_set_mac_address - Change Media Access Control Address |
| 4266 | * @dev: device |
| 4267 | * @sa: new address |
| 4268 | * |
| 4269 | * Change the hardware (MAC) address of the device |
| 4270 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4271 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
| 4272 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4273 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4274 | int err; |
| 4275 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4276 | if (!ops->ndo_set_mac_address) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4277 | return -EOPNOTSUPP; |
| 4278 | if (sa->sa_family != dev->type) |
| 4279 | return -EINVAL; |
| 4280 | if (!netif_device_present(dev)) |
| 4281 | return -ENODEV; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4282 | err = ops->ndo_set_mac_address(dev, sa); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4283 | if (!err) |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4284 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4285 | return err; |
| 4286 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4287 | EXPORT_SYMBOL(dev_set_mac_address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4288 | |
| 4289 | /* |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4290 | * Perform the SIOCxIFxxx calls, inside rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4291 | */ |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4292 | static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4293 | { |
| 4294 | int err; |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4295 | struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4296 | |
| 4297 | if (!dev) |
| 4298 | return -ENODEV; |
| 4299 | |
| 4300 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4301 | case SIOCGIFFLAGS: /* Get interface flags */ |
| 4302 | ifr->ifr_flags = (short) dev_get_flags(dev); |
| 4303 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4304 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4305 | case SIOCGIFMETRIC: /* Get the metric on the interface |
| 4306 | (currently unused) */ |
| 4307 | ifr->ifr_metric = 0; |
| 4308 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4309 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4310 | case SIOCGIFMTU: /* Get the MTU of a device */ |
| 4311 | ifr->ifr_mtu = dev->mtu; |
| 4312 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4313 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4314 | case SIOCGIFHWADDR: |
| 4315 | if (!dev->addr_len) |
| 4316 | memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data); |
| 4317 | else |
| 4318 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, |
| 4319 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); |
| 4320 | ifr->ifr_hwaddr.sa_family = dev->type; |
| 4321 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4322 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4323 | case SIOCGIFSLAVE: |
| 4324 | err = -EINVAL; |
| 4325 | break; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4326 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4327 | case SIOCGIFMAP: |
| 4328 | ifr->ifr_map.mem_start = dev->mem_start; |
| 4329 | ifr->ifr_map.mem_end = dev->mem_end; |
| 4330 | ifr->ifr_map.base_addr = dev->base_addr; |
| 4331 | ifr->ifr_map.irq = dev->irq; |
| 4332 | ifr->ifr_map.dma = dev->dma; |
| 4333 | ifr->ifr_map.port = dev->if_port; |
| 4334 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4335 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4336 | case SIOCGIFINDEX: |
| 4337 | ifr->ifr_ifindex = dev->ifindex; |
| 4338 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4339 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4340 | case SIOCGIFTXQLEN: |
| 4341 | ifr->ifr_qlen = dev->tx_queue_len; |
| 4342 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4343 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4344 | default: |
| 4345 | /* dev_ioctl() should ensure this case |
| 4346 | * is never reached |
| 4347 | */ |
| 4348 | WARN_ON(1); |
| 4349 | err = -EINVAL; |
| 4350 | break; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4351 | |
| 4352 | } |
| 4353 | return err; |
| 4354 | } |
| 4355 | |
| 4356 | /* |
| 4357 | * Perform the SIOCxIFxxx calls, inside rtnl_lock() |
| 4358 | */ |
| 4359 | static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) |
| 4360 | { |
| 4361 | int err; |
| 4362 | struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); |
Jarek Poplawski | 5f2f6da | 2008-12-22 19:35:28 -0800 | [diff] [blame] | 4363 | const struct net_device_ops *ops; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4364 | |
| 4365 | if (!dev) |
| 4366 | return -ENODEV; |
| 4367 | |
Jarek Poplawski | 5f2f6da | 2008-12-22 19:35:28 -0800 | [diff] [blame] | 4368 | ops = dev->netdev_ops; |
| 4369 | |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4370 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4371 | case SIOCSIFFLAGS: /* Set interface flags */ |
| 4372 | return dev_change_flags(dev, ifr->ifr_flags); |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4373 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4374 | case SIOCSIFMETRIC: /* Set the metric on the interface |
| 4375 | (currently unused) */ |
| 4376 | return -EOPNOTSUPP; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4377 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4378 | case SIOCSIFMTU: /* Set the MTU of a device */ |
| 4379 | return dev_set_mtu(dev, ifr->ifr_mtu); |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4380 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4381 | case SIOCSIFHWADDR: |
| 4382 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4383 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4384 | case SIOCSIFHWBROADCAST: |
| 4385 | if (ifr->ifr_hwaddr.sa_family != dev->type) |
| 4386 | return -EINVAL; |
| 4387 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, |
| 4388 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); |
| 4389 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
| 4390 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4391 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4392 | case SIOCSIFMAP: |
| 4393 | if (ops->ndo_set_config) { |
| 4394 | if (!netif_device_present(dev)) |
| 4395 | return -ENODEV; |
| 4396 | return ops->ndo_set_config(dev, &ifr->ifr_map); |
| 4397 | } |
| 4398 | return -EOPNOTSUPP; |
| 4399 | |
| 4400 | case SIOCADDMULTI: |
| 4401 | if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) || |
| 4402 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) |
| 4403 | return -EINVAL; |
| 4404 | if (!netif_device_present(dev)) |
| 4405 | return -ENODEV; |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 4406 | return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4407 | |
| 4408 | case SIOCDELMULTI: |
| 4409 | if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) || |
| 4410 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) |
| 4411 | return -EINVAL; |
| 4412 | if (!netif_device_present(dev)) |
| 4413 | return -ENODEV; |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 4414 | return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4415 | |
| 4416 | case SIOCSIFTXQLEN: |
| 4417 | if (ifr->ifr_qlen < 0) |
| 4418 | return -EINVAL; |
| 4419 | dev->tx_queue_len = ifr->ifr_qlen; |
| 4420 | return 0; |
| 4421 | |
| 4422 | case SIOCSIFNAME: |
| 4423 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; |
| 4424 | return dev_change_name(dev, ifr->ifr_newname); |
| 4425 | |
| 4426 | /* |
| 4427 | * Unknown or private ioctl |
| 4428 | */ |
| 4429 | default: |
| 4430 | if ((cmd >= SIOCDEVPRIVATE && |
| 4431 | cmd <= SIOCDEVPRIVATE + 15) || |
| 4432 | cmd == SIOCBONDENSLAVE || |
| 4433 | cmd == SIOCBONDRELEASE || |
| 4434 | cmd == SIOCBONDSETHWADDR || |
| 4435 | cmd == SIOCBONDSLAVEINFOQUERY || |
| 4436 | cmd == SIOCBONDINFOQUERY || |
| 4437 | cmd == SIOCBONDCHANGEACTIVE || |
| 4438 | cmd == SIOCGMIIPHY || |
| 4439 | cmd == SIOCGMIIREG || |
| 4440 | cmd == SIOCSMIIREG || |
| 4441 | cmd == SIOCBRADDIF || |
| 4442 | cmd == SIOCBRDELIF || |
| 4443 | cmd == SIOCSHWTSTAMP || |
| 4444 | cmd == SIOCWANDEV) { |
| 4445 | err = -EOPNOTSUPP; |
| 4446 | if (ops->ndo_do_ioctl) { |
| 4447 | if (netif_device_present(dev)) |
| 4448 | err = ops->ndo_do_ioctl(dev, ifr, cmd); |
| 4449 | else |
| 4450 | err = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4451 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4452 | } else |
| 4453 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4454 | |
| 4455 | } |
| 4456 | return err; |
| 4457 | } |
| 4458 | |
| 4459 | /* |
| 4460 | * This function handles all "interface"-type I/O control requests. The actual |
| 4461 | * 'doing' part of this is dev_ifsioc above. |
| 4462 | */ |
| 4463 | |
| 4464 | /** |
| 4465 | * dev_ioctl - network device ioctl |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 4466 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4467 | * @cmd: command to issue |
| 4468 | * @arg: pointer to a struct ifreq in user space |
| 4469 | * |
| 4470 | * Issue ioctl functions to devices. This is normally called by the |
| 4471 | * user space syscall interfaces but can sometimes be useful for |
| 4472 | * other purposes. The return value is the return from the syscall if |
| 4473 | * positive or a negative errno code on error. |
| 4474 | */ |
| 4475 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4476 | int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4477 | { |
| 4478 | struct ifreq ifr; |
| 4479 | int ret; |
| 4480 | char *colon; |
| 4481 | |
| 4482 | /* One special case: SIOCGIFCONF takes ifconf argument |
| 4483 | and requires shared lock, because it sleeps writing |
| 4484 | to user space. |
| 4485 | */ |
| 4486 | |
| 4487 | if (cmd == SIOCGIFCONF) { |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 4488 | rtnl_lock(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4489 | ret = dev_ifconf(net, (char __user *) arg); |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 4490 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4491 | return ret; |
| 4492 | } |
| 4493 | if (cmd == SIOCGIFNAME) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4494 | return dev_ifname(net, (struct ifreq __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4495 | |
| 4496 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) |
| 4497 | return -EFAULT; |
| 4498 | |
| 4499 | ifr.ifr_name[IFNAMSIZ-1] = 0; |
| 4500 | |
| 4501 | colon = strchr(ifr.ifr_name, ':'); |
| 4502 | if (colon) |
| 4503 | *colon = 0; |
| 4504 | |
| 4505 | /* |
| 4506 | * See which interface the caller is talking about. |
| 4507 | */ |
| 4508 | |
| 4509 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4510 | /* |
| 4511 | * These ioctl calls: |
| 4512 | * - can be done by all. |
| 4513 | * - atomic and do not require locking. |
| 4514 | * - return a value |
| 4515 | */ |
| 4516 | case SIOCGIFFLAGS: |
| 4517 | case SIOCGIFMETRIC: |
| 4518 | case SIOCGIFMTU: |
| 4519 | case SIOCGIFHWADDR: |
| 4520 | case SIOCGIFSLAVE: |
| 4521 | case SIOCGIFMAP: |
| 4522 | case SIOCGIFINDEX: |
| 4523 | case SIOCGIFTXQLEN: |
| 4524 | dev_load(net, ifr.ifr_name); |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4525 | rcu_read_lock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4526 | ret = dev_ifsioc_locked(net, &ifr, cmd); |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4527 | rcu_read_unlock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4528 | if (!ret) { |
| 4529 | if (colon) |
| 4530 | *colon = ':'; |
| 4531 | if (copy_to_user(arg, &ifr, |
| 4532 | sizeof(struct ifreq))) |
| 4533 | ret = -EFAULT; |
| 4534 | } |
| 4535 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4536 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4537 | case SIOCETHTOOL: |
| 4538 | dev_load(net, ifr.ifr_name); |
| 4539 | rtnl_lock(); |
| 4540 | ret = dev_ethtool(net, &ifr); |
| 4541 | rtnl_unlock(); |
| 4542 | if (!ret) { |
| 4543 | if (colon) |
| 4544 | *colon = ':'; |
| 4545 | if (copy_to_user(arg, &ifr, |
| 4546 | sizeof(struct ifreq))) |
| 4547 | ret = -EFAULT; |
| 4548 | } |
| 4549 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4550 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4551 | /* |
| 4552 | * These ioctl calls: |
| 4553 | * - require superuser power. |
| 4554 | * - require strict serialization. |
| 4555 | * - return a value |
| 4556 | */ |
| 4557 | case SIOCGMIIPHY: |
| 4558 | case SIOCGMIIREG: |
| 4559 | case SIOCSIFNAME: |
| 4560 | if (!capable(CAP_NET_ADMIN)) |
| 4561 | return -EPERM; |
| 4562 | dev_load(net, ifr.ifr_name); |
| 4563 | rtnl_lock(); |
| 4564 | ret = dev_ifsioc(net, &ifr, cmd); |
| 4565 | rtnl_unlock(); |
| 4566 | if (!ret) { |
| 4567 | if (colon) |
| 4568 | *colon = ':'; |
| 4569 | if (copy_to_user(arg, &ifr, |
| 4570 | sizeof(struct ifreq))) |
| 4571 | ret = -EFAULT; |
| 4572 | } |
| 4573 | return ret; |
| 4574 | |
| 4575 | /* |
| 4576 | * These ioctl calls: |
| 4577 | * - require superuser power. |
| 4578 | * - require strict serialization. |
| 4579 | * - do not return a value |
| 4580 | */ |
| 4581 | case SIOCSIFFLAGS: |
| 4582 | case SIOCSIFMETRIC: |
| 4583 | case SIOCSIFMTU: |
| 4584 | case SIOCSIFMAP: |
| 4585 | case SIOCSIFHWADDR: |
| 4586 | case SIOCSIFSLAVE: |
| 4587 | case SIOCADDMULTI: |
| 4588 | case SIOCDELMULTI: |
| 4589 | case SIOCSIFHWBROADCAST: |
| 4590 | case SIOCSIFTXQLEN: |
| 4591 | case SIOCSMIIREG: |
| 4592 | case SIOCBONDENSLAVE: |
| 4593 | case SIOCBONDRELEASE: |
| 4594 | case SIOCBONDSETHWADDR: |
| 4595 | case SIOCBONDCHANGEACTIVE: |
| 4596 | case SIOCBRADDIF: |
| 4597 | case SIOCBRDELIF: |
| 4598 | case SIOCSHWTSTAMP: |
| 4599 | if (!capable(CAP_NET_ADMIN)) |
| 4600 | return -EPERM; |
| 4601 | /* fall through */ |
| 4602 | case SIOCBONDSLAVEINFOQUERY: |
| 4603 | case SIOCBONDINFOQUERY: |
| 4604 | dev_load(net, ifr.ifr_name); |
| 4605 | rtnl_lock(); |
| 4606 | ret = dev_ifsioc(net, &ifr, cmd); |
| 4607 | rtnl_unlock(); |
| 4608 | return ret; |
| 4609 | |
| 4610 | case SIOCGIFMEM: |
| 4611 | /* Get the per device memory space. We can add this but |
| 4612 | * currently do not support it */ |
| 4613 | case SIOCSIFMEM: |
| 4614 | /* Set the per device memory buffer space. |
| 4615 | * Not applicable in our case */ |
| 4616 | case SIOCSIFLINK: |
| 4617 | return -EINVAL; |
| 4618 | |
| 4619 | /* |
| 4620 | * Unknown or private ioctl. |
| 4621 | */ |
| 4622 | default: |
| 4623 | if (cmd == SIOCWANDEV || |
| 4624 | (cmd >= SIOCDEVPRIVATE && |
| 4625 | cmd <= SIOCDEVPRIVATE + 15)) { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4626 | dev_load(net, ifr.ifr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4627 | rtnl_lock(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4628 | ret = dev_ifsioc(net, &ifr, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4629 | rtnl_unlock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4630 | if (!ret && copy_to_user(arg, &ifr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4631 | sizeof(struct ifreq))) |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4632 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4633 | return ret; |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4634 | } |
| 4635 | /* Take care of Wireless Extensions */ |
| 4636 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) |
| 4637 | return wext_handle_ioctl(net, &ifr, cmd, arg); |
| 4638 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4639 | } |
| 4640 | } |
| 4641 | |
| 4642 | |
| 4643 | /** |
| 4644 | * dev_new_index - allocate an ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 4645 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4646 | * |
| 4647 | * Returns a suitable unique value for a new device interface |
| 4648 | * number. The caller must hold the rtnl semaphore or the |
| 4649 | * dev_base_lock to be sure it remains unique. |
| 4650 | */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4651 | static int dev_new_index(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4652 | { |
| 4653 | static int ifindex; |
| 4654 | for (;;) { |
| 4655 | if (++ifindex <= 0) |
| 4656 | ifindex = 1; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4657 | if (!__dev_get_by_index(net, ifindex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4658 | return ifindex; |
| 4659 | } |
| 4660 | } |
| 4661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4662 | /* Delayed registration/unregisteration */ |
Denis Cheng | 3b5b34f | 2007-12-07 00:49:17 -0800 | [diff] [blame] | 4663 | static LIST_HEAD(net_todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4664 | |
Stephen Hemminger | 6f05f62 | 2007-03-08 20:46:03 -0800 | [diff] [blame] | 4665 | static void net_set_todo(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4666 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4667 | list_add_tail(&dev->todo_list, &net_todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4668 | } |
| 4669 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4670 | static void rollback_registered_many(struct list_head *head) |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4671 | { |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 4672 | struct net_device *dev, *tmp; |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4673 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4674 | BUG_ON(dev_boot_phase); |
| 4675 | ASSERT_RTNL(); |
| 4676 | |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 4677 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4678 | /* Some devices call without registering |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 4679 | * for initialization unwind. Remove those |
| 4680 | * devices and proceed with the remaining. |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4681 | */ |
| 4682 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
| 4683 | pr_debug("unregister_netdevice: device %s/%p never " |
| 4684 | "was registered\n", dev->name, dev); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4685 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4686 | WARN_ON(1); |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 4687 | list_del(&dev->unreg_list); |
| 4688 | continue; |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4689 | } |
| 4690 | |
| 4691 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
| 4692 | |
| 4693 | /* If device is running, close it first. */ |
| 4694 | dev_close(dev); |
| 4695 | |
| 4696 | /* And unlink it from device chain. */ |
| 4697 | unlist_netdevice(dev); |
| 4698 | |
| 4699 | dev->reg_state = NETREG_UNREGISTERING; |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4700 | } |
| 4701 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4702 | synchronize_net(); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4703 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4704 | list_for_each_entry(dev, head, unreg_list) { |
| 4705 | /* Shutdown queueing discipline. */ |
| 4706 | dev_shutdown(dev); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4707 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4708 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4709 | /* Notify protocols, that we are about to destroy |
| 4710 | this device. They should clean all the things. |
| 4711 | */ |
| 4712 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
| 4713 | |
Patrick McHardy | a283576 | 2010-02-26 06:34:51 +0000 | [diff] [blame] | 4714 | if (!dev->rtnl_link_ops || |
| 4715 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) |
| 4716 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); |
| 4717 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4718 | /* |
| 4719 | * Flush the unicast and multicast chains |
| 4720 | */ |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 4721 | dev_uc_flush(dev); |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 4722 | dev_mc_flush(dev); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4723 | |
| 4724 | if (dev->netdev_ops->ndo_uninit) |
| 4725 | dev->netdev_ops->ndo_uninit(dev); |
| 4726 | |
| 4727 | /* Notifier chain MUST detach us from master device. */ |
| 4728 | WARN_ON(dev->master); |
| 4729 | |
| 4730 | /* Remove entries from kobject tree */ |
| 4731 | netdev_unregister_kobject(dev); |
| 4732 | } |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4733 | |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 4734 | /* Process any work delayed until the end of the batch */ |
stephen hemminger | e5e26d7 | 2010-02-24 14:01:38 +0000 | [diff] [blame] | 4735 | dev = list_first_entry(head, struct net_device, unreg_list); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 4736 | call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev); |
| 4737 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4738 | synchronize_net(); |
| 4739 | |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 4740 | list_for_each_entry(dev, head, unreg_list) |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4741 | dev_put(dev); |
| 4742 | } |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4743 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4744 | static void rollback_registered(struct net_device *dev) |
| 4745 | { |
| 4746 | LIST_HEAD(single); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4747 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4748 | list_add(&dev->unreg_list, &single); |
| 4749 | rollback_registered_many(&single); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4750 | } |
| 4751 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 4752 | static void __netdev_init_queue_locks_one(struct net_device *dev, |
| 4753 | struct netdev_queue *dev_queue, |
| 4754 | void *_unused) |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4755 | { |
| 4756 | spin_lock_init(&dev_queue->_xmit_lock); |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 4757 | netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4758 | dev_queue->xmit_lock_owner = -1; |
| 4759 | } |
| 4760 | |
| 4761 | static void netdev_init_queue_locks(struct net_device *dev) |
| 4762 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 4763 | netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL); |
| 4764 | __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4765 | } |
| 4766 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 4767 | unsigned long netdev_fix_features(unsigned long features, const char *name) |
| 4768 | { |
| 4769 | /* Fix illegal SG+CSUM combinations. */ |
| 4770 | if ((features & NETIF_F_SG) && |
| 4771 | !(features & NETIF_F_ALL_CSUM)) { |
| 4772 | if (name) |
| 4773 | printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no " |
| 4774 | "checksum feature.\n", name); |
| 4775 | features &= ~NETIF_F_SG; |
| 4776 | } |
| 4777 | |
| 4778 | /* TSO requires that SG is present as well. */ |
| 4779 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) { |
| 4780 | if (name) |
| 4781 | printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no " |
| 4782 | "SG feature.\n", name); |
| 4783 | features &= ~NETIF_F_TSO; |
| 4784 | } |
| 4785 | |
| 4786 | if (features & NETIF_F_UFO) { |
| 4787 | if (!(features & NETIF_F_GEN_CSUM)) { |
| 4788 | if (name) |
| 4789 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " |
| 4790 | "since no NETIF_F_HW_CSUM feature.\n", |
| 4791 | name); |
| 4792 | features &= ~NETIF_F_UFO; |
| 4793 | } |
| 4794 | |
| 4795 | if (!(features & NETIF_F_SG)) { |
| 4796 | if (name) |
| 4797 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " |
| 4798 | "since no NETIF_F_SG feature.\n", name); |
| 4799 | features &= ~NETIF_F_UFO; |
| 4800 | } |
| 4801 | } |
| 4802 | |
| 4803 | return features; |
| 4804 | } |
| 4805 | EXPORT_SYMBOL(netdev_fix_features); |
| 4806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4807 | /** |
Patrick Mullaney | fc4a748 | 2009-12-03 15:59:22 -0800 | [diff] [blame] | 4808 | * netif_stacked_transfer_operstate - transfer operstate |
| 4809 | * @rootdev: the root or lower level device to transfer state from |
| 4810 | * @dev: the device to transfer operstate to |
| 4811 | * |
| 4812 | * Transfer operational state from root to device. This is normally |
| 4813 | * called when a stacking relationship exists between the root |
| 4814 | * device and the device(a leaf device). |
| 4815 | */ |
| 4816 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, |
| 4817 | struct net_device *dev) |
| 4818 | { |
| 4819 | if (rootdev->operstate == IF_OPER_DORMANT) |
| 4820 | netif_dormant_on(dev); |
| 4821 | else |
| 4822 | netif_dormant_off(dev); |
| 4823 | |
| 4824 | if (netif_carrier_ok(rootdev)) { |
| 4825 | if (!netif_carrier_ok(dev)) |
| 4826 | netif_carrier_on(dev); |
| 4827 | } else { |
| 4828 | if (netif_carrier_ok(dev)) |
| 4829 | netif_carrier_off(dev); |
| 4830 | } |
| 4831 | } |
| 4832 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); |
| 4833 | |
| 4834 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4835 | * register_netdevice - register a network device |
| 4836 | * @dev: device to register |
| 4837 | * |
| 4838 | * Take a completed network device structure and add it to the kernel |
| 4839 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
| 4840 | * chain. 0 is returned on success. A negative errno code is returned |
| 4841 | * on a failure to set up the device, or if the name is a duplicate. |
| 4842 | * |
| 4843 | * Callers must hold the rtnl semaphore. You may want |
| 4844 | * register_netdev() instead of this. |
| 4845 | * |
| 4846 | * BUGS: |
| 4847 | * The locking appears insufficient to guarantee two parallel registers |
| 4848 | * will not get the same name. |
| 4849 | */ |
| 4850 | |
| 4851 | int register_netdevice(struct net_device *dev) |
| 4852 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4853 | int ret; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4854 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4855 | |
| 4856 | BUG_ON(dev_boot_phase); |
| 4857 | ASSERT_RTNL(); |
| 4858 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 4859 | might_sleep(); |
| 4860 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4861 | /* When net_device's are persistent, this will be fatal. */ |
| 4862 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4863 | BUG_ON(!net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4864 | |
David S. Miller | f1f28aa | 2008-07-15 00:08:33 -0700 | [diff] [blame] | 4865 | spin_lock_init(&dev->addr_list_lock); |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 4866 | netdev_set_addr_lockdep_class(dev); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4867 | netdev_init_queue_locks(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4869 | dev->iflink = -1; |
| 4870 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 4871 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 4872 | if (!dev->num_rx_queues) { |
| 4873 | /* |
| 4874 | * Allocate a single RX queue if driver never called |
| 4875 | * alloc_netdev_mq |
| 4876 | */ |
| 4877 | |
| 4878 | dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL); |
| 4879 | if (!dev->_rx) { |
| 4880 | ret = -ENOMEM; |
| 4881 | goto out; |
| 4882 | } |
| 4883 | |
| 4884 | dev->_rx->first = dev->_rx; |
| 4885 | atomic_set(&dev->_rx->count, 1); |
| 4886 | dev->num_rx_queues = 1; |
| 4887 | } |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 4888 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4889 | /* Init, if this function is available */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4890 | if (dev->netdev_ops->ndo_init) { |
| 4891 | ret = dev->netdev_ops->ndo_init(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4892 | if (ret) { |
| 4893 | if (ret > 0) |
| 4894 | ret = -EIO; |
Adrian Bunk | 90833aa | 2006-11-13 16:02:22 -0800 | [diff] [blame] | 4895 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4896 | } |
| 4897 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 4898 | |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 4899 | ret = dev_get_valid_name(net, dev->name, dev->name, 0); |
| 4900 | if (ret) |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 4901 | goto err_uninit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4902 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4903 | dev->ifindex = dev_new_index(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4904 | if (dev->iflink == -1) |
| 4905 | dev->iflink = dev->ifindex; |
| 4906 | |
Stephen Hemminger | d212f87 | 2007-06-27 00:47:37 -0700 | [diff] [blame] | 4907 | /* Fix illegal checksum combinations */ |
| 4908 | if ((dev->features & NETIF_F_HW_CSUM) && |
| 4909 | (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
| 4910 | printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n", |
| 4911 | dev->name); |
| 4912 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
| 4913 | } |
| 4914 | |
| 4915 | if ((dev->features & NETIF_F_NO_CSUM) && |
| 4916 | (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
| 4917 | printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n", |
| 4918 | dev->name); |
| 4919 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM); |
| 4920 | } |
| 4921 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 4922 | dev->features = netdev_fix_features(dev->features, dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4923 | |
Lennert Buytenhek | e5a4a72 | 2008-08-03 01:23:10 -0700 | [diff] [blame] | 4924 | /* Enable software GSO if SG is supported. */ |
| 4925 | if (dev->features & NETIF_F_SG) |
| 4926 | dev->features |= NETIF_F_GSO; |
| 4927 | |
Daniel Lezcano | aaf8cdc | 2008-05-02 17:00:58 -0700 | [diff] [blame] | 4928 | netdev_initialize_kobject(dev); |
Johannes Berg | 7ffbe3f | 2009-10-02 05:15:27 +0000 | [diff] [blame] | 4929 | |
| 4930 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
| 4931 | ret = notifier_to_errno(ret); |
| 4932 | if (ret) |
| 4933 | goto err_uninit; |
| 4934 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 4935 | ret = netdev_register_kobject(dev); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 4936 | if (ret) |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 4937 | goto err_uninit; |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 4938 | dev->reg_state = NETREG_REGISTERED; |
| 4939 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4940 | /* |
| 4941 | * Default initial state at registry is that the |
| 4942 | * device is present. |
| 4943 | */ |
| 4944 | |
| 4945 | set_bit(__LINK_STATE_PRESENT, &dev->state); |
| 4946 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4947 | dev_init_scheduler(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4948 | dev_hold(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 4949 | list_netdevice(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4950 | |
| 4951 | /* Notify protocols, that a new device appeared. */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4952 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 4953 | ret = notifier_to_errno(ret); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4954 | if (ret) { |
| 4955 | rollback_registered(dev); |
| 4956 | dev->reg_state = NETREG_UNREGISTERED; |
| 4957 | } |
Eric W. Biederman | d90a909 | 2009-12-12 22:11:15 +0000 | [diff] [blame] | 4958 | /* |
| 4959 | * Prevent userspace races by waiting until the network |
| 4960 | * device is fully setup before sending notifications. |
| 4961 | */ |
Patrick McHardy | a283576 | 2010-02-26 06:34:51 +0000 | [diff] [blame] | 4962 | if (!dev->rtnl_link_ops || |
| 4963 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) |
| 4964 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4965 | |
| 4966 | out: |
| 4967 | return ret; |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 4968 | |
| 4969 | err_uninit: |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4970 | if (dev->netdev_ops->ndo_uninit) |
| 4971 | dev->netdev_ops->ndo_uninit(dev); |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 4972 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4973 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4974 | EXPORT_SYMBOL(register_netdevice); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4975 | |
| 4976 | /** |
Benjamin Herrenschmidt | 937f1ba | 2009-01-14 21:05:05 -0800 | [diff] [blame] | 4977 | * init_dummy_netdev - init a dummy network device for NAPI |
| 4978 | * @dev: device to init |
| 4979 | * |
| 4980 | * This takes a network device structure and initialize the minimum |
| 4981 | * amount of fields so it can be used to schedule NAPI polls without |
| 4982 | * registering a full blown interface. This is to be used by drivers |
| 4983 | * that need to tie several hardware interfaces to a single NAPI |
| 4984 | * poll scheduler due to HW limitations. |
| 4985 | */ |
| 4986 | int init_dummy_netdev(struct net_device *dev) |
| 4987 | { |
| 4988 | /* Clear everything. Note we don't initialize spinlocks |
| 4989 | * are they aren't supposed to be taken by any of the |
| 4990 | * NAPI code and this dummy netdev is supposed to be |
| 4991 | * only ever used for NAPI polls |
| 4992 | */ |
| 4993 | memset(dev, 0, sizeof(struct net_device)); |
| 4994 | |
| 4995 | /* make sure we BUG if trying to hit standard |
| 4996 | * register/unregister code path |
| 4997 | */ |
| 4998 | dev->reg_state = NETREG_DUMMY; |
| 4999 | |
| 5000 | /* initialize the ref count */ |
| 5001 | atomic_set(&dev->refcnt, 1); |
| 5002 | |
| 5003 | /* NAPI wants this */ |
| 5004 | INIT_LIST_HEAD(&dev->napi_list); |
| 5005 | |
| 5006 | /* a dummy interface is started by default */ |
| 5007 | set_bit(__LINK_STATE_PRESENT, &dev->state); |
| 5008 | set_bit(__LINK_STATE_START, &dev->state); |
| 5009 | |
| 5010 | return 0; |
| 5011 | } |
| 5012 | EXPORT_SYMBOL_GPL(init_dummy_netdev); |
| 5013 | |
| 5014 | |
| 5015 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5016 | * register_netdev - register a network device |
| 5017 | * @dev: device to register |
| 5018 | * |
| 5019 | * Take a completed network device structure and add it to the kernel |
| 5020 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
| 5021 | * chain. 0 is returned on success. A negative errno code is returned |
| 5022 | * on a failure to set up the device, or if the name is a duplicate. |
| 5023 | * |
Borislav Petkov | 38b4da3 | 2007-04-20 22:14:10 -0700 | [diff] [blame] | 5024 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5025 | * and expands the device name if you passed a format string to |
| 5026 | * alloc_netdev. |
| 5027 | */ |
| 5028 | int register_netdev(struct net_device *dev) |
| 5029 | { |
| 5030 | int err; |
| 5031 | |
| 5032 | rtnl_lock(); |
| 5033 | |
| 5034 | /* |
| 5035 | * If the name is a format string the caller wants us to do a |
| 5036 | * name allocation. |
| 5037 | */ |
| 5038 | if (strchr(dev->name, '%')) { |
| 5039 | err = dev_alloc_name(dev, dev->name); |
| 5040 | if (err < 0) |
| 5041 | goto out; |
| 5042 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5043 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5044 | err = register_netdevice(dev); |
| 5045 | out: |
| 5046 | rtnl_unlock(); |
| 5047 | return err; |
| 5048 | } |
| 5049 | EXPORT_SYMBOL(register_netdev); |
| 5050 | |
| 5051 | /* |
| 5052 | * netdev_wait_allrefs - wait until all references are gone. |
| 5053 | * |
| 5054 | * This is called when unregistering network devices. |
| 5055 | * |
| 5056 | * Any protocol or device that holds a reference should register |
| 5057 | * for netdevice notification, and cleanup and put back the |
| 5058 | * reference if they receive an UNREGISTER event. |
| 5059 | * We can get stuck here if buggy protocols don't correctly |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5060 | * call dev_put. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5061 | */ |
| 5062 | static void netdev_wait_allrefs(struct net_device *dev) |
| 5063 | { |
| 5064 | unsigned long rebroadcast_time, warning_time; |
| 5065 | |
Eric Dumazet | e014deb | 2009-11-17 05:59:21 +0000 | [diff] [blame] | 5066 | linkwatch_forget_dev(dev); |
| 5067 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5068 | rebroadcast_time = warning_time = jiffies; |
| 5069 | while (atomic_read(&dev->refcnt) != 0) { |
| 5070 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5071 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5072 | |
| 5073 | /* Rebroadcast unregister notification */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 5074 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 5075 | /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users |
Octavian Purdila | 395264d | 2009-11-16 13:49:35 +0000 | [diff] [blame] | 5076 | * should have already handle it the first time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5077 | |
| 5078 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
| 5079 | &dev->state)) { |
| 5080 | /* We must not have linkwatch events |
| 5081 | * pending on unregister. If this |
| 5082 | * happens, we simply run the queue |
| 5083 | * unscheduled, resulting in a noop |
| 5084 | * for this device. |
| 5085 | */ |
| 5086 | linkwatch_run_queue(); |
| 5087 | } |
| 5088 | |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5089 | __rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5090 | |
| 5091 | rebroadcast_time = jiffies; |
| 5092 | } |
| 5093 | |
| 5094 | msleep(250); |
| 5095 | |
| 5096 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
| 5097 | printk(KERN_EMERG "unregister_netdevice: " |
| 5098 | "waiting for %s to become free. Usage " |
| 5099 | "count = %d\n", |
| 5100 | dev->name, atomic_read(&dev->refcnt)); |
| 5101 | warning_time = jiffies; |
| 5102 | } |
| 5103 | } |
| 5104 | } |
| 5105 | |
| 5106 | /* The sequence is: |
| 5107 | * |
| 5108 | * rtnl_lock(); |
| 5109 | * ... |
| 5110 | * register_netdevice(x1); |
| 5111 | * register_netdevice(x2); |
| 5112 | * ... |
| 5113 | * unregister_netdevice(y1); |
| 5114 | * unregister_netdevice(y2); |
| 5115 | * ... |
| 5116 | * rtnl_unlock(); |
| 5117 | * free_netdev(y1); |
| 5118 | * free_netdev(y2); |
| 5119 | * |
Herbert Xu | 58ec3b4 | 2008-10-07 15:50:03 -0700 | [diff] [blame] | 5120 | * We are invoked by rtnl_unlock(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5121 | * This allows us to deal with problems: |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5122 | * 1) We can delete sysfs objects which invoke hotplug |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5123 | * without deadlocking with linkwatch via keventd. |
| 5124 | * 2) Since we run with the RTNL semaphore not held, we can sleep |
| 5125 | * safely in order to wait for the netdev refcnt to drop to zero. |
Herbert Xu | 58ec3b4 | 2008-10-07 15:50:03 -0700 | [diff] [blame] | 5126 | * |
| 5127 | * We must not return until all unregister events added during |
| 5128 | * the interval the lock was held have been completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5129 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5130 | void netdev_run_todo(void) |
| 5131 | { |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5132 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5134 | /* Snapshot list, allow later requests */ |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5135 | list_replace_init(&net_todo_list, &list); |
Herbert Xu | 58ec3b4 | 2008-10-07 15:50:03 -0700 | [diff] [blame] | 5136 | |
| 5137 | __rtnl_unlock(); |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5139 | while (!list_empty(&list)) { |
| 5140 | struct net_device *dev |
stephen hemminger | e5e26d7 | 2010-02-24 14:01:38 +0000 | [diff] [blame] | 5141 | = list_first_entry(&list, struct net_device, todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5142 | list_del(&dev->todo_list); |
| 5143 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5144 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5145 | printk(KERN_ERR "network todo '%s' but state %d\n", |
| 5146 | dev->name, dev->reg_state); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5147 | dump_stack(); |
| 5148 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5149 | } |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5150 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5151 | dev->reg_state = NETREG_UNREGISTERED; |
| 5152 | |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 5153 | on_each_cpu(flush_backlog, dev, 1); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 5154 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5155 | netdev_wait_allrefs(dev); |
| 5156 | |
| 5157 | /* paranoia */ |
| 5158 | BUG_ON(atomic_read(&dev->refcnt)); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 5159 | WARN_ON(dev->ip_ptr); |
| 5160 | WARN_ON(dev->ip6_ptr); |
| 5161 | WARN_ON(dev->dn_ptr); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5162 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5163 | if (dev->destructor) |
| 5164 | dev->destructor(dev); |
Stephen Hemminger | 9093bbb | 2007-05-19 15:39:25 -0700 | [diff] [blame] | 5165 | |
| 5166 | /* Free network device */ |
| 5167 | kobject_put(&dev->dev.kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5168 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5169 | } |
| 5170 | |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5171 | /** |
Eric Dumazet | d83345a | 2009-11-16 03:36:51 +0000 | [diff] [blame] | 5172 | * dev_txq_stats_fold - fold tx_queues stats |
| 5173 | * @dev: device to get statistics from |
| 5174 | * @stats: struct net_device_stats to hold results |
| 5175 | */ |
| 5176 | void dev_txq_stats_fold(const struct net_device *dev, |
| 5177 | struct net_device_stats *stats) |
| 5178 | { |
| 5179 | unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0; |
| 5180 | unsigned int i; |
| 5181 | struct netdev_queue *txq; |
| 5182 | |
| 5183 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 5184 | txq = netdev_get_tx_queue(dev, i); |
| 5185 | tx_bytes += txq->tx_bytes; |
| 5186 | tx_packets += txq->tx_packets; |
| 5187 | tx_dropped += txq->tx_dropped; |
| 5188 | } |
| 5189 | if (tx_bytes || tx_packets || tx_dropped) { |
| 5190 | stats->tx_bytes = tx_bytes; |
| 5191 | stats->tx_packets = tx_packets; |
| 5192 | stats->tx_dropped = tx_dropped; |
| 5193 | } |
| 5194 | } |
| 5195 | EXPORT_SYMBOL(dev_txq_stats_fold); |
| 5196 | |
| 5197 | /** |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5198 | * dev_get_stats - get network device statistics |
| 5199 | * @dev: device to get statistics from |
| 5200 | * |
| 5201 | * Get network statistics from device. The device driver may provide |
| 5202 | * its own method by setting dev->netdev_ops->get_stats; otherwise |
| 5203 | * the internal statistics structure is used. |
| 5204 | */ |
| 5205 | const struct net_device_stats *dev_get_stats(struct net_device *dev) |
Eric Dumazet | 7004bf2 | 2009-05-18 00:34:33 +0000 | [diff] [blame] | 5206 | { |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5207 | const struct net_device_ops *ops = dev->netdev_ops; |
| 5208 | |
| 5209 | if (ops->ndo_get_stats) |
| 5210 | return ops->ndo_get_stats(dev); |
Eric Dumazet | 7004bf2 | 2009-05-18 00:34:33 +0000 | [diff] [blame] | 5211 | |
Eric Dumazet | d83345a | 2009-11-16 03:36:51 +0000 | [diff] [blame] | 5212 | dev_txq_stats_fold(dev, &dev->stats); |
| 5213 | return &dev->stats; |
Rusty Russell | c45d286 | 2007-03-28 14:29:08 -0700 | [diff] [blame] | 5214 | } |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5215 | EXPORT_SYMBOL(dev_get_stats); |
Rusty Russell | c45d286 | 2007-03-28 14:29:08 -0700 | [diff] [blame] | 5216 | |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 5217 | static void netdev_init_one_queue(struct net_device *dev, |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5218 | struct netdev_queue *queue, |
| 5219 | void *_unused) |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 5220 | { |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 5221 | queue->dev = dev; |
| 5222 | } |
| 5223 | |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 5224 | static void netdev_init_queues(struct net_device *dev) |
| 5225 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5226 | netdev_init_one_queue(dev, &dev->rx_queue, NULL); |
| 5227 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
David S. Miller | c3f26a2 | 2008-07-31 16:58:50 -0700 | [diff] [blame] | 5228 | spin_lock_init(&dev->tx_global_lock); |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 5229 | } |
| 5230 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5231 | /** |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 5232 | * alloc_netdev_mq - allocate network device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5233 | * @sizeof_priv: size of private data to allocate space for |
| 5234 | * @name: device name format string |
| 5235 | * @setup: callback to initialize device |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 5236 | * @queue_count: the number of subqueues to allocate |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5237 | * |
| 5238 | * Allocates a struct net_device with private data area for driver use |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 5239 | * and performs basic initialization. Also allocates subquue structs |
| 5240 | * for each queue on the device at the end of the netdevice. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5241 | */ |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 5242 | struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, |
| 5243 | void (*setup)(struct net_device *), unsigned int queue_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5244 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5245 | struct netdev_queue *tx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5246 | struct net_device *dev; |
Stephen Hemminger | 7943986 | 2008-07-21 13:28:44 -0700 | [diff] [blame] | 5247 | size_t alloc_size; |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5248 | struct net_device *p; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5249 | #ifdef CONFIG_RPS |
| 5250 | struct netdev_rx_queue *rx; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5251 | int i; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5252 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5253 | |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 5254 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
| 5255 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 5256 | alloc_size = sizeof(struct net_device); |
Alexey Dobriyan | d1643d2 | 2008-04-18 15:43:32 -0700 | [diff] [blame] | 5257 | if (sizeof_priv) { |
| 5258 | /* ensure 32-byte alignment of private area */ |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5259 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
Alexey Dobriyan | d1643d2 | 2008-04-18 15:43:32 -0700 | [diff] [blame] | 5260 | alloc_size += sizeof_priv; |
| 5261 | } |
| 5262 | /* ensure 32-byte alignment of whole construct */ |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5263 | alloc_size += NETDEV_ALIGN - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5264 | |
Paolo 'Blaisorblade' Giarrusso | 31380de | 2006-04-06 22:38:28 -0700 | [diff] [blame] | 5265 | p = kzalloc(alloc_size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5266 | if (!p) { |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 5267 | printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5268 | return NULL; |
| 5269 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5270 | |
Stephen Hemminger | 7943986 | 2008-07-21 13:28:44 -0700 | [diff] [blame] | 5271 | tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5272 | if (!tx) { |
| 5273 | printk(KERN_ERR "alloc_netdev: Unable to allocate " |
| 5274 | "tx qdiscs.\n"); |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5275 | goto free_p; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5276 | } |
| 5277 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5278 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5279 | rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL); |
| 5280 | if (!rx) { |
| 5281 | printk(KERN_ERR "alloc_netdev: Unable to allocate " |
| 5282 | "rx queues.\n"); |
| 5283 | goto free_tx; |
| 5284 | } |
| 5285 | |
| 5286 | atomic_set(&rx->count, queue_count); |
| 5287 | |
| 5288 | /* |
| 5289 | * Set a pointer to first element in the array which holds the |
| 5290 | * reference count. |
| 5291 | */ |
| 5292 | for (i = 0; i < queue_count; i++) |
| 5293 | rx[i].first = rx; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5294 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5295 | |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5296 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5297 | dev->padded = (char *)dev - (char *)p; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5298 | |
| 5299 | if (dev_addr_init(dev)) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5300 | goto free_rx; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5301 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 5302 | dev_mc_init(dev); |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 5303 | dev_uc_init(dev); |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 5304 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 5305 | dev_net_set(dev, &init_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5306 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5307 | dev->_tx = tx; |
| 5308 | dev->num_tx_queues = queue_count; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 5309 | dev->real_num_tx_queues = queue_count; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5310 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5311 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5312 | dev->_rx = rx; |
| 5313 | dev->num_rx_queues = queue_count; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5314 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5315 | |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 5316 | dev->gso_max_size = GSO_MAX_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5317 | |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 5318 | netdev_init_queues(dev); |
| 5319 | |
Peter P Waskiewicz Jr | 15682bc | 2010-02-10 20:03:05 -0800 | [diff] [blame] | 5320 | INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list); |
| 5321 | dev->ethtool_ntuple_list.count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5322 | INIT_LIST_HEAD(&dev->napi_list); |
Eric W. Biederman | 9fdce09 | 2009-10-30 14:51:13 +0000 | [diff] [blame] | 5323 | INIT_LIST_HEAD(&dev->unreg_list); |
Eric Dumazet | e014deb | 2009-11-17 05:59:21 +0000 | [diff] [blame] | 5324 | INIT_LIST_HEAD(&dev->link_watch_list); |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 5325 | dev->priv_flags = IFF_XMIT_DST_RELEASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5326 | setup(dev); |
| 5327 | strcpy(dev->name, name); |
| 5328 | return dev; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5329 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5330 | free_rx: |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5331 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5332 | kfree(rx); |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5333 | free_tx: |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5334 | #endif |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5335 | kfree(tx); |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5336 | free_p: |
| 5337 | kfree(p); |
| 5338 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5339 | } |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 5340 | EXPORT_SYMBOL(alloc_netdev_mq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5341 | |
| 5342 | /** |
| 5343 | * free_netdev - free network device |
| 5344 | * @dev: device |
| 5345 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5346 | * This function does the last stage of destroying an allocated device |
| 5347 | * interface. The reference to the device object is released. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5348 | * If this is the last reference then it will be freed. |
| 5349 | */ |
| 5350 | void free_netdev(struct net_device *dev) |
| 5351 | { |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5352 | struct napi_struct *p, *n; |
| 5353 | |
Denis V. Lunev | f3005d7 | 2008-04-16 02:02:18 -0700 | [diff] [blame] | 5354 | release_net(dev_net(dev)); |
| 5355 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5356 | kfree(dev->_tx); |
| 5357 | |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 5358 | /* Flush device addresses */ |
| 5359 | dev_addr_flush(dev); |
| 5360 | |
Peter P Waskiewicz Jr | 15682bc | 2010-02-10 20:03:05 -0800 | [diff] [blame] | 5361 | /* Clear ethtool n-tuple list */ |
| 5362 | ethtool_ntuple_flush(dev); |
| 5363 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5364 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
| 5365 | netif_napi_del(p); |
| 5366 | |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 5367 | /* Compatibility with error handling in drivers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5368 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
| 5369 | kfree((char *)dev - dev->padded); |
| 5370 | return; |
| 5371 | } |
| 5372 | |
| 5373 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); |
| 5374 | dev->reg_state = NETREG_RELEASED; |
| 5375 | |
Greg Kroah-Hartman | 43cb76d | 2002-04-09 12:14:34 -0700 | [diff] [blame] | 5376 | /* will free via device release */ |
| 5377 | put_device(&dev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5378 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5379 | EXPORT_SYMBOL(free_netdev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5380 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 5381 | /** |
| 5382 | * synchronize_net - Synchronize with packet receive processing |
| 5383 | * |
| 5384 | * Wait for packets currently being received to be done. |
| 5385 | * Does not block later packets from starting. |
| 5386 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5387 | void synchronize_net(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5388 | { |
| 5389 | might_sleep(); |
Paul E. McKenney | fbd568a3e | 2005-05-01 08:59:04 -0700 | [diff] [blame] | 5390 | synchronize_rcu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5391 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5392 | EXPORT_SYMBOL(synchronize_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5393 | |
| 5394 | /** |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5395 | * unregister_netdevice_queue - remove device from the kernel |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5396 | * @dev: device |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5397 | * @head: list |
Jaswinder Singh Rajput | 6ebfbc0 | 2009-11-22 20:43:13 -0800 | [diff] [blame] | 5398 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5399 | * This function shuts down a device interface and removes it |
Wang Chen | d59b54b | 2007-12-11 02:28:03 -0800 | [diff] [blame] | 5400 | * from the kernel tables. |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5401 | * If head not NULL, device is queued to be unregistered later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5402 | * |
| 5403 | * Callers must hold the rtnl semaphore. You may want |
| 5404 | * unregister_netdev() instead of this. |
| 5405 | */ |
| 5406 | |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5407 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5408 | { |
Herbert Xu | a662071 | 2007-12-12 19:21:56 -0800 | [diff] [blame] | 5409 | ASSERT_RTNL(); |
| 5410 | |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5411 | if (head) { |
Eric W. Biederman | 9fdce09 | 2009-10-30 14:51:13 +0000 | [diff] [blame] | 5412 | list_move_tail(&dev->unreg_list, head); |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5413 | } else { |
| 5414 | rollback_registered(dev); |
| 5415 | /* Finish processing unregister after unlock */ |
| 5416 | net_set_todo(dev); |
| 5417 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5418 | } |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5419 | EXPORT_SYMBOL(unregister_netdevice_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5420 | |
| 5421 | /** |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5422 | * unregister_netdevice_many - unregister many devices |
| 5423 | * @head: list of devices |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5424 | */ |
| 5425 | void unregister_netdevice_many(struct list_head *head) |
| 5426 | { |
| 5427 | struct net_device *dev; |
| 5428 | |
| 5429 | if (!list_empty(head)) { |
| 5430 | rollback_registered_many(head); |
| 5431 | list_for_each_entry(dev, head, unreg_list) |
| 5432 | net_set_todo(dev); |
| 5433 | } |
| 5434 | } |
Eric Dumazet | 63c8099 | 2009-10-27 07:06:49 +0000 | [diff] [blame] | 5435 | EXPORT_SYMBOL(unregister_netdevice_many); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5436 | |
| 5437 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5438 | * unregister_netdev - remove device from the kernel |
| 5439 | * @dev: device |
| 5440 | * |
| 5441 | * This function shuts down a device interface and removes it |
Wang Chen | d59b54b | 2007-12-11 02:28:03 -0800 | [diff] [blame] | 5442 | * from the kernel tables. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5443 | * |
| 5444 | * This is just a wrapper for unregister_netdevice that takes |
| 5445 | * the rtnl semaphore. In general you want to use this and not |
| 5446 | * unregister_netdevice. |
| 5447 | */ |
| 5448 | void unregister_netdev(struct net_device *dev) |
| 5449 | { |
| 5450 | rtnl_lock(); |
| 5451 | unregister_netdevice(dev); |
| 5452 | rtnl_unlock(); |
| 5453 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5454 | EXPORT_SYMBOL(unregister_netdev); |
| 5455 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5456 | /** |
| 5457 | * dev_change_net_namespace - move device to different nethost namespace |
| 5458 | * @dev: device |
| 5459 | * @net: network namespace |
| 5460 | * @pat: If not NULL name pattern to try if the current device name |
| 5461 | * is already taken in the destination network namespace. |
| 5462 | * |
| 5463 | * This function shuts down a device interface and moves it |
| 5464 | * to a new network namespace. On success 0 is returned, on |
| 5465 | * a failure a netagive errno code is returned. |
| 5466 | * |
| 5467 | * Callers must hold the rtnl semaphore. |
| 5468 | */ |
| 5469 | |
| 5470 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) |
| 5471 | { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5472 | int err; |
| 5473 | |
| 5474 | ASSERT_RTNL(); |
| 5475 | |
| 5476 | /* Don't allow namespace local devices to be moved. */ |
| 5477 | err = -EINVAL; |
| 5478 | if (dev->features & NETIF_F_NETNS_LOCAL) |
| 5479 | goto out; |
| 5480 | |
Eric W. Biederman | 3891845 | 2008-10-27 17:51:47 -0700 | [diff] [blame] | 5481 | #ifdef CONFIG_SYSFS |
| 5482 | /* Don't allow real devices to be moved when sysfs |
| 5483 | * is enabled. |
| 5484 | */ |
| 5485 | err = -EINVAL; |
| 5486 | if (dev->dev.parent) |
| 5487 | goto out; |
| 5488 | #endif |
| 5489 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5490 | /* Ensure the device has been registrered */ |
| 5491 | err = -EINVAL; |
| 5492 | if (dev->reg_state != NETREG_REGISTERED) |
| 5493 | goto out; |
| 5494 | |
| 5495 | /* Get out if there is nothing todo */ |
| 5496 | err = 0; |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 5497 | if (net_eq(dev_net(dev), net)) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5498 | goto out; |
| 5499 | |
| 5500 | /* Pick the destination device name, and ensure |
| 5501 | * we can use it in the destination network namespace. |
| 5502 | */ |
| 5503 | err = -EEXIST; |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 5504 | if (__dev_get_by_name(net, dev->name)) { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5505 | /* We get here if we can't use the current device name */ |
| 5506 | if (!pat) |
| 5507 | goto out; |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 5508 | if (dev_get_valid_name(net, pat, dev->name, 1)) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5509 | goto out; |
| 5510 | } |
| 5511 | |
| 5512 | /* |
| 5513 | * And now a mini version of register_netdevice unregister_netdevice. |
| 5514 | */ |
| 5515 | |
| 5516 | /* If device is running close it first. */ |
Pavel Emelyanov | 9b77265 | 2007-10-10 02:49:09 -0700 | [diff] [blame] | 5517 | dev_close(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5518 | |
| 5519 | /* And unlink it from device chain */ |
| 5520 | err = -ENODEV; |
| 5521 | unlist_netdevice(dev); |
| 5522 | |
| 5523 | synchronize_net(); |
| 5524 | |
| 5525 | /* Shutdown queueing discipline. */ |
| 5526 | dev_shutdown(dev); |
| 5527 | |
| 5528 | /* Notify protocols, that we are about to destroy |
| 5529 | this device. They should clean all the things. |
| 5530 | */ |
| 5531 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 5532 | call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5533 | |
| 5534 | /* |
| 5535 | * Flush the unicast and multicast chains |
| 5536 | */ |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 5537 | dev_uc_flush(dev); |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 5538 | dev_mc_flush(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5539 | |
Eric W. Biederman | 3891845 | 2008-10-27 17:51:47 -0700 | [diff] [blame] | 5540 | netdev_unregister_kobject(dev); |
| 5541 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5542 | /* Actually switch the network namespace */ |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 5543 | dev_net_set(dev, net); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5544 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5545 | /* If there is an ifindex conflict assign a new one */ |
| 5546 | if (__dev_get_by_index(net, dev->ifindex)) { |
| 5547 | int iflink = (dev->iflink == dev->ifindex); |
| 5548 | dev->ifindex = dev_new_index(net); |
| 5549 | if (iflink) |
| 5550 | dev->iflink = dev->ifindex; |
| 5551 | } |
| 5552 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5553 | /* Fixup kobjects */ |
Daniel Lezcano | aaf8cdc | 2008-05-02 17:00:58 -0700 | [diff] [blame] | 5554 | err = netdev_register_kobject(dev); |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5555 | WARN_ON(err); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5556 | |
| 5557 | /* Add the device back in the hashes */ |
| 5558 | list_netdevice(dev); |
| 5559 | |
| 5560 | /* Notify protocols, that a new device appeared. */ |
| 5561 | call_netdevice_notifiers(NETDEV_REGISTER, dev); |
| 5562 | |
Eric W. Biederman | d90a909 | 2009-12-12 22:11:15 +0000 | [diff] [blame] | 5563 | /* |
| 5564 | * Prevent userspace races by waiting until the network |
| 5565 | * device is fully setup before sending notifications. |
| 5566 | */ |
| 5567 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); |
| 5568 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5569 | synchronize_net(); |
| 5570 | err = 0; |
| 5571 | out: |
| 5572 | return err; |
| 5573 | } |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 5574 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5576 | static int dev_cpu_callback(struct notifier_block *nfb, |
| 5577 | unsigned long action, |
| 5578 | void *ocpu) |
| 5579 | { |
| 5580 | struct sk_buff **list_skb; |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 5581 | struct Qdisc **list_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5582 | struct sk_buff *skb; |
| 5583 | unsigned int cpu, oldcpu = (unsigned long)ocpu; |
| 5584 | struct softnet_data *sd, *oldsd; |
| 5585 | |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 5586 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5587 | return NOTIFY_OK; |
| 5588 | |
| 5589 | local_irq_disable(); |
| 5590 | cpu = smp_processor_id(); |
| 5591 | sd = &per_cpu(softnet_data, cpu); |
| 5592 | oldsd = &per_cpu(softnet_data, oldcpu); |
| 5593 | |
| 5594 | /* Find end of our completion_queue. */ |
| 5595 | list_skb = &sd->completion_queue; |
| 5596 | while (*list_skb) |
| 5597 | list_skb = &(*list_skb)->next; |
| 5598 | /* Append completion queue from offline CPU. */ |
| 5599 | *list_skb = oldsd->completion_queue; |
| 5600 | oldsd->completion_queue = NULL; |
| 5601 | |
| 5602 | /* Find end of our output_queue. */ |
| 5603 | list_net = &sd->output_queue; |
| 5604 | while (*list_net) |
| 5605 | list_net = &(*list_net)->next_sched; |
| 5606 | /* Append output queue from offline CPU. */ |
| 5607 | *list_net = oldsd->output_queue; |
| 5608 | oldsd->output_queue = NULL; |
| 5609 | |
| 5610 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 5611 | local_irq_enable(); |
| 5612 | |
| 5613 | /* Process offline CPU's input_pkt_queue */ |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 5614 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5615 | netif_rx(skb); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame^] | 5616 | incr_input_queue_head(oldsd); |
| 5617 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5618 | |
| 5619 | return NOTIFY_OK; |
| 5620 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5621 | |
| 5622 | |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5623 | /** |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5624 | * netdev_increment_features - increment feature set by one |
| 5625 | * @all: current feature set |
| 5626 | * @one: new feature set |
| 5627 | * @mask: mask feature set |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5628 | * |
| 5629 | * Computes a new feature set after adding a device with feature set |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5630 | * @one to the master device with current feature set @all. Will not |
| 5631 | * enable anything that is off in @mask. Returns the new feature set. |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5632 | */ |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5633 | unsigned long netdev_increment_features(unsigned long all, unsigned long one, |
| 5634 | unsigned long mask) |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5635 | { |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5636 | /* If device needs checksumming, downgrade to it. */ |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5637 | if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM)) |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5638 | all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM); |
| 5639 | else if (mask & NETIF_F_ALL_CSUM) { |
| 5640 | /* If one device supports v4/v6 checksumming, set for all. */ |
| 5641 | if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) && |
| 5642 | !(all & NETIF_F_GEN_CSUM)) { |
| 5643 | all &= ~NETIF_F_ALL_CSUM; |
| 5644 | all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); |
| 5645 | } |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5646 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5647 | /* If one device supports hw checksumming, set for all. */ |
| 5648 | if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) { |
| 5649 | all &= ~NETIF_F_ALL_CSUM; |
| 5650 | all |= NETIF_F_HW_CSUM; |
| 5651 | } |
| 5652 | } |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5653 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5654 | one |= NETIF_F_ALL_CSUM; |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5655 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5656 | one |= all & NETIF_F_ONE_FOR_ALL; |
Sridhar Samudrala | d9f5950 | 2009-10-07 12:24:25 +0000 | [diff] [blame] | 5657 | all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO; |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5658 | all |= one & mask & NETIF_F_ONE_FOR_ALL; |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5659 | |
| 5660 | return all; |
| 5661 | } |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5662 | EXPORT_SYMBOL(netdev_increment_features); |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5663 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5664 | static struct hlist_head *netdev_create_hash(void) |
| 5665 | { |
| 5666 | int i; |
| 5667 | struct hlist_head *hash; |
| 5668 | |
| 5669 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); |
| 5670 | if (hash != NULL) |
| 5671 | for (i = 0; i < NETDEV_HASHENTRIES; i++) |
| 5672 | INIT_HLIST_HEAD(&hash[i]); |
| 5673 | |
| 5674 | return hash; |
| 5675 | } |
| 5676 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5677 | /* Initialize per network namespace state */ |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 5678 | static int __net_init netdev_init(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5679 | { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5680 | INIT_LIST_HEAD(&net->dev_base_head); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5681 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5682 | net->dev_name_head = netdev_create_hash(); |
| 5683 | if (net->dev_name_head == NULL) |
| 5684 | goto err_name; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5685 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5686 | net->dev_index_head = netdev_create_hash(); |
| 5687 | if (net->dev_index_head == NULL) |
| 5688 | goto err_idx; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5689 | |
| 5690 | return 0; |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5691 | |
| 5692 | err_idx: |
| 5693 | kfree(net->dev_name_head); |
| 5694 | err_name: |
| 5695 | return -ENOMEM; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5696 | } |
| 5697 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 5698 | /** |
| 5699 | * netdev_drivername - network driver for the device |
| 5700 | * @dev: network device |
| 5701 | * @buffer: buffer for resulting name |
| 5702 | * @len: size of buffer |
| 5703 | * |
| 5704 | * Determine network driver for device. |
| 5705 | */ |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 5706 | char *netdev_drivername(const struct net_device *dev, char *buffer, int len) |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 5707 | { |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 5708 | const struct device_driver *driver; |
| 5709 | const struct device *parent; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 5710 | |
| 5711 | if (len <= 0 || !buffer) |
| 5712 | return buffer; |
| 5713 | buffer[0] = 0; |
| 5714 | |
| 5715 | parent = dev->dev.parent; |
| 5716 | |
| 5717 | if (!parent) |
| 5718 | return buffer; |
| 5719 | |
| 5720 | driver = parent->driver; |
| 5721 | if (driver && driver->name) |
| 5722 | strlcpy(buffer, driver->name, len); |
| 5723 | return buffer; |
| 5724 | } |
| 5725 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 5726 | static void __net_exit netdev_exit(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5727 | { |
| 5728 | kfree(net->dev_name_head); |
| 5729 | kfree(net->dev_index_head); |
| 5730 | } |
| 5731 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 5732 | static struct pernet_operations __net_initdata netdev_net_ops = { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5733 | .init = netdev_init, |
| 5734 | .exit = netdev_exit, |
| 5735 | }; |
| 5736 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 5737 | static void __net_exit default_device_exit(struct net *net) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5738 | { |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 5739 | struct net_device *dev, *aux; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5740 | /* |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 5741 | * Push all migratable network devices back to the |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5742 | * initial network namespace |
| 5743 | */ |
| 5744 | rtnl_lock(); |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 5745 | for_each_netdev_safe(net, dev, aux) { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5746 | int err; |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5747 | char fb_name[IFNAMSIZ]; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5748 | |
| 5749 | /* Ignore unmoveable devices (i.e. loopback) */ |
| 5750 | if (dev->features & NETIF_F_NETNS_LOCAL) |
| 5751 | continue; |
| 5752 | |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 5753 | /* Leave virtual devices for the generic cleanup */ |
| 5754 | if (dev->rtnl_link_ops) |
| 5755 | continue; |
Eric W. Biederman | d0c082c | 2008-11-05 15:59:38 -0800 | [diff] [blame] | 5756 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5757 | /* Push remaing network devices to init_net */ |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5758 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
| 5759 | err = dev_change_net_namespace(dev, &init_net, fb_name); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5760 | if (err) { |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5761 | printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n", |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5762 | __func__, dev->name, err); |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5763 | BUG(); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5764 | } |
| 5765 | } |
| 5766 | rtnl_unlock(); |
| 5767 | } |
| 5768 | |
Eric W. Biederman | 04dc7f6b | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 5769 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
| 5770 | { |
| 5771 | /* At exit all network devices most be removed from a network |
| 5772 | * namespace. Do this in the reverse order of registeration. |
| 5773 | * Do this across as many network namespaces as possible to |
| 5774 | * improve batching efficiency. |
| 5775 | */ |
| 5776 | struct net_device *dev; |
| 5777 | struct net *net; |
| 5778 | LIST_HEAD(dev_kill_list); |
| 5779 | |
| 5780 | rtnl_lock(); |
| 5781 | list_for_each_entry(net, net_list, exit_list) { |
| 5782 | for_each_netdev_reverse(net, dev) { |
| 5783 | if (dev->rtnl_link_ops) |
| 5784 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
| 5785 | else |
| 5786 | unregister_netdevice_queue(dev, &dev_kill_list); |
| 5787 | } |
| 5788 | } |
| 5789 | unregister_netdevice_many(&dev_kill_list); |
| 5790 | rtnl_unlock(); |
| 5791 | } |
| 5792 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 5793 | static struct pernet_operations __net_initdata default_device_ops = { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5794 | .exit = default_device_exit, |
Eric W. Biederman | 04dc7f6b | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 5795 | .exit_batch = default_device_exit_batch, |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5796 | }; |
| 5797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5798 | /* |
| 5799 | * Initialize the DEV module. At boot time this walks the device list and |
| 5800 | * unhooks any devices that fail to initialise (normally hardware not |
| 5801 | * present) and leaves us with a valid list of present and active devices. |
| 5802 | * |
| 5803 | */ |
| 5804 | |
| 5805 | /* |
| 5806 | * This is called single threaded during boot, so no need |
| 5807 | * to take the rtnl semaphore. |
| 5808 | */ |
| 5809 | static int __init net_dev_init(void) |
| 5810 | { |
| 5811 | int i, rc = -ENOMEM; |
| 5812 | |
| 5813 | BUG_ON(!dev_boot_phase); |
| 5814 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5815 | if (dev_proc_init()) |
| 5816 | goto out; |
| 5817 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5818 | if (netdev_kobject_init()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5819 | goto out; |
| 5820 | |
| 5821 | INIT_LIST_HEAD(&ptype_all); |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 5822 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5823 | INIT_LIST_HEAD(&ptype_base[i]); |
| 5824 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5825 | if (register_pernet_subsys(&netdev_net_ops)) |
| 5826 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5827 | |
| 5828 | /* |
| 5829 | * Initialise the packet receive queues. |
| 5830 | */ |
| 5831 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 5832 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5833 | struct softnet_data *queue; |
| 5834 | |
| 5835 | queue = &per_cpu(softnet_data, i); |
| 5836 | skb_queue_head_init(&queue->input_pkt_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5837 | queue->completion_queue = NULL; |
| 5838 | INIT_LIST_HEAD(&queue->poll_list); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 5839 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5840 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5841 | queue->csd.func = trigger_softirq; |
| 5842 | queue->csd.info = queue; |
| 5843 | queue->csd.flags = 0; |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 5844 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5845 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 5846 | queue->backlog.poll = process_backlog; |
| 5847 | queue->backlog.weight = weight_p; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5848 | queue->backlog.gro_list = NULL; |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 5849 | queue->backlog.gro_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5850 | } |
| 5851 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5852 | dev_boot_phase = 0; |
| 5853 | |
Eric W. Biederman | 505d4f7 | 2008-11-07 22:54:20 -0800 | [diff] [blame] | 5854 | /* The loopback device is special if any other network devices |
| 5855 | * is present in a network namespace the loopback device must |
| 5856 | * be present. Since we now dynamically allocate and free the |
| 5857 | * loopback device ensure this invariant is maintained by |
| 5858 | * keeping the loopback device as the first device on the |
| 5859 | * list of network devices. Ensuring the loopback devices |
| 5860 | * is the first device that appears and the last network device |
| 5861 | * that disappears. |
| 5862 | */ |
| 5863 | if (register_pernet_device(&loopback_net_ops)) |
| 5864 | goto out; |
| 5865 | |
| 5866 | if (register_pernet_device(&default_device_ops)) |
| 5867 | goto out; |
| 5868 | |
Carlos R. Mafra | 962cf36 | 2008-05-15 11:15:37 -0300 | [diff] [blame] | 5869 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
| 5870 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5871 | |
| 5872 | hotcpu_notifier(dev_cpu_callback, 0); |
| 5873 | dst_init(); |
| 5874 | dev_mcast_init(); |
| 5875 | rc = 0; |
| 5876 | out: |
| 5877 | return rc; |
| 5878 | } |
| 5879 | |
| 5880 | subsys_initcall(net_dev_init); |
| 5881 | |
Krishna Kumar | e88721f | 2009-02-18 17:55:02 -0800 | [diff] [blame] | 5882 | static int __init initialize_hashrnd(void) |
| 5883 | { |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5884 | get_random_bytes(&hashrnd, sizeof(hashrnd)); |
Krishna Kumar | e88721f | 2009-02-18 17:55:02 -0800 | [diff] [blame] | 5885 | return 0; |
| 5886 | } |
| 5887 | |
| 5888 | late_initcall_sync(initialize_hashrnd); |
| 5889 | |