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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | #include <linux/sched.h> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 84 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | #include <linux/string.h> |
| 86 | #include <linux/mm.h> |
| 87 | #include <linux/socket.h> |
| 88 | #include <linux/sockios.h> |
| 89 | #include <linux/errno.h> |
| 90 | #include <linux/interrupt.h> |
| 91 | #include <linux/if_ether.h> |
| 92 | #include <linux/netdevice.h> |
| 93 | #include <linux/etherdevice.h> |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 94 | #include <linux/ethtool.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #include <linux/notifier.h> |
| 96 | #include <linux/skbuff.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 97 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | #include <net/sock.h> |
| 99 | #include <linux/rtnetlink.h> |
| 100 | #include <linux/proc_fs.h> |
| 101 | #include <linux/seq_file.h> |
| 102 | #include <linux/stat.h> |
| 103 | #include <linux/if_bridge.h> |
Patrick McHardy | b863ceb | 2007-07-14 18:55:06 -0700 | [diff] [blame] | 104 | #include <linux/if_macvlan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | #include <net/dst.h> |
| 106 | #include <net/pkt_sched.h> |
| 107 | #include <net/checksum.h> |
| 108 | #include <linux/highmem.h> |
| 109 | #include <linux/init.h> |
| 110 | #include <linux/kmod.h> |
| 111 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | #include <linux/netpoll.h> |
| 113 | #include <linux/rcupdate.h> |
| 114 | #include <linux/delay.h> |
Johannes Berg | 295f4a1 | 2007-04-26 20:43:56 -0700 | [diff] [blame] | 115 | #include <net/wext.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | #include <net/iw_handler.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | #include <asm/current.h> |
Steve Grubb | 5bdb988 | 2005-12-03 08:39:35 -0500 | [diff] [blame] | 118 | #include <linux/audit.h> |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 119 | #include <linux/dmaengine.h> |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 120 | #include <linux/err.h> |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 121 | #include <linux/ctype.h> |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 122 | #include <linux/if_arp.h> |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 123 | #include <linux/if_vlan.h> |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 124 | #include <linux/ip.h> |
Alexander Duyck | ad55dca | 2008-09-20 22:05:50 -0700 | [diff] [blame] | 125 | #include <net/ip.h> |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 126 | #include <linux/ipv6.h> |
| 127 | #include <linux/in.h> |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 128 | #include <linux/jhash.h> |
| 129 | #include <linux/random.h> |
David S. Miller | 9cbc1cb | 2009-06-15 03:02:23 -0700 | [diff] [blame] | 130 | #include <trace/events/napi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Pavel Emelyanov | 342709e | 2007-10-23 21:14:45 -0700 | [diff] [blame] | 132 | #include "net-sysfs.h" |
| 133 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 134 | /* Instead of increasing this, you should create a hash table. */ |
| 135 | #define MAX_GRO_SKBS 8 |
| 136 | |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 137 | /* This should be increased if a protocol with a bigger head is added. */ |
| 138 | #define GRO_MAX_HEAD (MAX_HEADER + 128) |
| 139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | /* |
| 141 | * The list of packet types we will receive (as opposed to discard) |
| 142 | * and the routines to invoke. |
| 143 | * |
| 144 | * Why 16. Because with 16 the only overlap we get on a hash of the |
| 145 | * low nibble of the protocol value is RARP/SNAP/X.25. |
| 146 | * |
| 147 | * NOTE: That is no longer true with the addition of VLAN tags. Not |
| 148 | * sure which should go first, but I bet it won't make much |
| 149 | * difference if we are running VLANs. The good news is that |
| 150 | * this protocol won't be in the list unless compiled in, so |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 151 | * the average user (w/out VLANs) will not be adversely affected. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | * --BLG |
| 153 | * |
| 154 | * 0800 IP |
| 155 | * 8100 802.1Q VLAN |
| 156 | * 0001 802.3 |
| 157 | * 0002 AX.25 |
| 158 | * 0004 802.2 |
| 159 | * 8035 RARP |
| 160 | * 0005 SNAP |
| 161 | * 0805 X.25 |
| 162 | * 0806 ARP |
| 163 | * 8137 IPX |
| 164 | * 0009 Localtalk |
| 165 | * 86DD IPv6 |
| 166 | */ |
| 167 | |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 168 | #define PTYPE_HASH_SIZE (16) |
| 169 | #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | static DEFINE_SPINLOCK(ptype_lock); |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 172 | static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 173 | static struct list_head ptype_all __read_mostly; /* Taps */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | /* |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 176 | * 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] | 177 | * semaphore. |
| 178 | * |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 179 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | * |
| 181 | * Writers must hold the rtnl semaphore while they loop through the |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 182 | * 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] | 183 | * actual updates. This allows pure readers to access the list even |
| 184 | * while a writer is preparing to update it. |
| 185 | * |
| 186 | * To put it another way, dev_base_lock is held for writing only to |
| 187 | * protect against pure readers; the rtnl semaphore provides the |
| 188 | * protection against other writers. |
| 189 | * |
| 190 | * See, for example usages, register_netdevice() and |
| 191 | * unregister_netdevice(), which must be called with the rtnl |
| 192 | * semaphore held. |
| 193 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | DEFINE_RWLOCK(dev_base_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | EXPORT_SYMBOL(dev_base_lock); |
| 196 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 197 | 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] | 198 | { |
| 199 | unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); |
stephen hemminger | 08e9897 | 2009-11-10 07:20:34 +0000 | [diff] [blame] | 200 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 203 | 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] | 204 | { |
Eric Dumazet | 7c28bd0 | 2009-10-24 06:13:17 -0700 | [diff] [blame] | 205 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | } |
| 207 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 208 | /* Device list insertion */ |
| 209 | static int list_netdevice(struct net_device *dev) |
| 210 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 211 | struct net *net = dev_net(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 212 | |
| 213 | ASSERT_RTNL(); |
| 214 | |
| 215 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 216 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 217 | 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] | 218 | hlist_add_head_rcu(&dev->index_hlist, |
| 219 | dev_index_hash(net, dev->ifindex)); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 220 | write_unlock_bh(&dev_base_lock); |
| 221 | return 0; |
| 222 | } |
| 223 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 224 | /* Device list removal |
| 225 | * caller must respect a RCU grace period before freeing/reusing dev |
| 226 | */ |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 227 | static void unlist_netdevice(struct net_device *dev) |
| 228 | { |
| 229 | ASSERT_RTNL(); |
| 230 | |
| 231 | /* Unlink dev from the device chain */ |
| 232 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 233 | list_del_rcu(&dev->dev_list); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 234 | hlist_del_rcu(&dev->name_hlist); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 235 | hlist_del_rcu(&dev->index_hlist); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 236 | write_unlock_bh(&dev_base_lock); |
| 237 | } |
| 238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | /* |
| 240 | * Our notifier list |
| 241 | */ |
| 242 | |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 243 | static RAW_NOTIFIER_HEAD(netdev_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | /* |
| 246 | * Device drivers call our routines to queue packets here. We empty the |
| 247 | * queue in the local softnet handler. |
| 248 | */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 249 | |
| 250 | DEFINE_PER_CPU(struct softnet_data, softnet_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 251 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 253 | #ifdef CONFIG_LOCKDEP |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 254 | /* |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 255 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 256 | * according to dev->type |
| 257 | */ |
| 258 | static const unsigned short netdev_lock_type[] = |
| 259 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, |
| 260 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, |
| 261 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, |
| 262 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, |
| 263 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, |
| 264 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, |
| 265 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, |
| 266 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, |
| 267 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, |
| 268 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, |
| 269 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, |
| 270 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, |
| 271 | ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211, |
Rémi Denis-Courmont | 2d91d78 | 2008-12-17 15:47:29 -0800 | [diff] [blame] | 272 | ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, |
Dmitry Eremin-Solenikov | 929122cd | 2009-08-14 20:00:20 +0400 | [diff] [blame] | 273 | ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154, |
Sergey Lapin | fcb94e4 | 2009-06-08 12:18:47 +0000 | [diff] [blame] | 274 | ARPHRD_VOID, ARPHRD_NONE}; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 275 | |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 276 | static const char *const netdev_lock_name[] = |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 277 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
| 278 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", |
| 279 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", |
| 280 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", |
| 281 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", |
| 282 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", |
| 283 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", |
| 284 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", |
| 285 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", |
| 286 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", |
| 287 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", |
| 288 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", |
| 289 | "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211", |
Rémi Denis-Courmont | 2d91d78 | 2008-12-17 15:47:29 -0800 | [diff] [blame] | 290 | "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", |
Dmitry Eremin-Solenikov | 929122cd | 2009-08-14 20:00:20 +0400 | [diff] [blame] | 291 | "_xmit_PHONET_PIPE", "_xmit_IEEE802154", |
Sergey Lapin | fcb94e4 | 2009-06-08 12:18:47 +0000 | [diff] [blame] | 292 | "_xmit_VOID", "_xmit_NONE"}; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 293 | |
| 294 | 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] | 295 | 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] | 296 | |
| 297 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) |
| 298 | { |
| 299 | int i; |
| 300 | |
| 301 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) |
| 302 | if (netdev_lock_type[i] == dev_type) |
| 303 | return i; |
| 304 | /* the last key is used by default */ |
| 305 | return ARRAY_SIZE(netdev_lock_type) - 1; |
| 306 | } |
| 307 | |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 308 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
| 309 | unsigned short dev_type) |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 310 | { |
| 311 | int i; |
| 312 | |
| 313 | i = netdev_lock_pos(dev_type); |
| 314 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], |
| 315 | netdev_lock_name[i]); |
| 316 | } |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 317 | |
| 318 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
| 319 | { |
| 320 | int i; |
| 321 | |
| 322 | i = netdev_lock_pos(dev->type); |
| 323 | lockdep_set_class_and_name(&dev->addr_list_lock, |
| 324 | &netdev_addr_lock_key[i], |
| 325 | netdev_lock_name[i]); |
| 326 | } |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 327 | #else |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 328 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
| 329 | unsigned short dev_type) |
| 330 | { |
| 331 | } |
| 332 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 333 | { |
| 334 | } |
| 335 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
| 337 | /******************************************************************************* |
| 338 | |
| 339 | Protocol management and registration routines |
| 340 | |
| 341 | *******************************************************************************/ |
| 342 | |
| 343 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | * Add a protocol ID to the list. Now that the input handler is |
| 345 | * smarter we can dispense with all the messy stuff that used to be |
| 346 | * here. |
| 347 | * |
| 348 | * BEWARE!!! Protocol handlers, mangling input packets, |
| 349 | * MUST BE last in hash buckets and checking protocol handlers |
| 350 | * MUST start from promiscuous ptype_all chain in net_bh. |
| 351 | * It is true now, do not change it. |
| 352 | * Explanation follows: if protocol handler, mangling packet, will |
| 353 | * be the first on list, it is not able to sense, that packet |
| 354 | * is cloned and should be copied-on-write, so that it will |
| 355 | * change it and subsequent readers will get broken packet. |
| 356 | * --ANK (980803) |
| 357 | */ |
| 358 | |
| 359 | /** |
| 360 | * dev_add_pack - add packet handler |
| 361 | * @pt: packet type declaration |
| 362 | * |
| 363 | * Add a protocol handler to the networking stack. The passed &packet_type |
| 364 | * is linked into kernel lists and may not be freed until it has been |
| 365 | * removed from the kernel lists. |
| 366 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 367 | * This call does not sleep therefore it can not |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | * guarantee all CPU's that are in middle of receiving packets |
| 369 | * will see the new packet type (until the next received packet). |
| 370 | */ |
| 371 | |
| 372 | void dev_add_pack(struct packet_type *pt) |
| 373 | { |
| 374 | int hash; |
| 375 | |
| 376 | spin_lock_bh(&ptype_lock); |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 377 | if (pt->type == htons(ETH_P_ALL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | list_add_rcu(&pt->list, &ptype_all); |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 379 | else { |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 380 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | list_add_rcu(&pt->list, &ptype_base[hash]); |
| 382 | } |
| 383 | spin_unlock_bh(&ptype_lock); |
| 384 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 385 | EXPORT_SYMBOL(dev_add_pack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | /** |
| 388 | * __dev_remove_pack - remove packet handler |
| 389 | * @pt: packet type declaration |
| 390 | * |
| 391 | * Remove a protocol handler that was previously added to the kernel |
| 392 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed |
| 393 | * 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] | 394 | * returns. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | * |
| 396 | * The packet type might still be in use by receivers |
| 397 | * and must not be freed until after all the CPU's have gone |
| 398 | * through a quiescent state. |
| 399 | */ |
| 400 | void __dev_remove_pack(struct packet_type *pt) |
| 401 | { |
| 402 | struct list_head *head; |
| 403 | struct packet_type *pt1; |
| 404 | |
| 405 | spin_lock_bh(&ptype_lock); |
| 406 | |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 407 | if (pt->type == htons(ETH_P_ALL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | head = &ptype_all; |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 409 | else |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 410 | head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
| 412 | list_for_each_entry(pt1, head, list) { |
| 413 | if (pt == pt1) { |
| 414 | list_del_rcu(&pt->list); |
| 415 | goto out; |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt); |
| 420 | out: |
| 421 | spin_unlock_bh(&ptype_lock); |
| 422 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 423 | EXPORT_SYMBOL(__dev_remove_pack); |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | /** |
| 426 | * dev_remove_pack - remove packet handler |
| 427 | * @pt: packet type declaration |
| 428 | * |
| 429 | * Remove a protocol handler that was previously added to the kernel |
| 430 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed |
| 431 | * from the kernel lists and can be freed or reused once this function |
| 432 | * returns. |
| 433 | * |
| 434 | * This call sleeps to guarantee that no CPU is looking at the packet |
| 435 | * type after return. |
| 436 | */ |
| 437 | void dev_remove_pack(struct packet_type *pt) |
| 438 | { |
| 439 | __dev_remove_pack(pt); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | synchronize_net(); |
| 442 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 443 | EXPORT_SYMBOL(dev_remove_pack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
| 445 | /****************************************************************************** |
| 446 | |
| 447 | Device Boot-time Settings Routines |
| 448 | |
| 449 | *******************************************************************************/ |
| 450 | |
| 451 | /* Boot time configuration table */ |
| 452 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; |
| 453 | |
| 454 | /** |
| 455 | * netdev_boot_setup_add - add new setup entry |
| 456 | * @name: name of the device |
| 457 | * @map: configured settings for the device |
| 458 | * |
| 459 | * Adds new setup entry to the dev_boot_setup list. The function |
| 460 | * returns 0 on error and 1 on success. This is a generic routine to |
| 461 | * all netdevices. |
| 462 | */ |
| 463 | static int netdev_boot_setup_add(char *name, struct ifmap *map) |
| 464 | { |
| 465 | struct netdev_boot_setup *s; |
| 466 | int i; |
| 467 | |
| 468 | s = dev_boot_setup; |
| 469 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { |
| 470 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { |
| 471 | memset(s[i].name, 0, sizeof(s[i].name)); |
Wang Chen | 93b3cff | 2008-07-01 19:57:19 -0700 | [diff] [blame] | 472 | strlcpy(s[i].name, name, IFNAMSIZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
| 474 | break; |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; |
| 479 | } |
| 480 | |
| 481 | /** |
| 482 | * netdev_boot_setup_check - check boot time settings |
| 483 | * @dev: the netdevice |
| 484 | * |
| 485 | * Check boot time settings for the device. |
| 486 | * The found settings are set for the device to be used |
| 487 | * later in the device probing. |
| 488 | * Returns 0 if no settings found, 1 if they are. |
| 489 | */ |
| 490 | int netdev_boot_setup_check(struct net_device *dev) |
| 491 | { |
| 492 | struct netdev_boot_setup *s = dev_boot_setup; |
| 493 | int i; |
| 494 | |
| 495 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { |
| 496 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && |
Wang Chen | 93b3cff | 2008-07-01 19:57:19 -0700 | [diff] [blame] | 497 | !strcmp(dev->name, s[i].name)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | dev->irq = s[i].map.irq; |
| 499 | dev->base_addr = s[i].map.base_addr; |
| 500 | dev->mem_start = s[i].map.mem_start; |
| 501 | dev->mem_end = s[i].map.mem_end; |
| 502 | return 1; |
| 503 | } |
| 504 | } |
| 505 | return 0; |
| 506 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 507 | EXPORT_SYMBOL(netdev_boot_setup_check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
| 509 | |
| 510 | /** |
| 511 | * netdev_boot_base - get address from boot time settings |
| 512 | * @prefix: prefix for network device |
| 513 | * @unit: id for network device |
| 514 | * |
| 515 | * Check boot time settings for the base address of device. |
| 516 | * The found settings are set for the device to be used |
| 517 | * later in the device probing. |
| 518 | * Returns 0 if no settings found. |
| 519 | */ |
| 520 | unsigned long netdev_boot_base(const char *prefix, int unit) |
| 521 | { |
| 522 | const struct netdev_boot_setup *s = dev_boot_setup; |
| 523 | char name[IFNAMSIZ]; |
| 524 | int i; |
| 525 | |
| 526 | sprintf(name, "%s%d", prefix, unit); |
| 527 | |
| 528 | /* |
| 529 | * If device already registered then return base of 1 |
| 530 | * to indicate not to probe for this interface |
| 531 | */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 532 | if (__dev_get_by_name(&init_net, name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | return 1; |
| 534 | |
| 535 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) |
| 536 | if (!strcmp(name, s[i].name)) |
| 537 | return s[i].map.base_addr; |
| 538 | return 0; |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * Saves at boot time configured settings for any netdevice. |
| 543 | */ |
| 544 | int __init netdev_boot_setup(char *str) |
| 545 | { |
| 546 | int ints[5]; |
| 547 | struct ifmap map; |
| 548 | |
| 549 | str = get_options(str, ARRAY_SIZE(ints), ints); |
| 550 | if (!str || !*str) |
| 551 | return 0; |
| 552 | |
| 553 | /* Save settings */ |
| 554 | memset(&map, 0, sizeof(map)); |
| 555 | if (ints[0] > 0) |
| 556 | map.irq = ints[1]; |
| 557 | if (ints[0] > 1) |
| 558 | map.base_addr = ints[2]; |
| 559 | if (ints[0] > 2) |
| 560 | map.mem_start = ints[3]; |
| 561 | if (ints[0] > 3) |
| 562 | map.mem_end = ints[4]; |
| 563 | |
| 564 | /* Add new entry to the list */ |
| 565 | return netdev_boot_setup_add(str, &map); |
| 566 | } |
| 567 | |
| 568 | __setup("netdev=", netdev_boot_setup); |
| 569 | |
| 570 | /******************************************************************************* |
| 571 | |
| 572 | Device Interface Subroutines |
| 573 | |
| 574 | *******************************************************************************/ |
| 575 | |
| 576 | /** |
| 577 | * __dev_get_by_name - find a device by its name |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 578 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | * @name: name to find |
| 580 | * |
| 581 | * Find an interface by name. Must be called under RTNL semaphore |
| 582 | * or @dev_base_lock. If the name is found a pointer to the device |
| 583 | * is returned. If the name is not found then %NULL is returned. The |
| 584 | * reference counters are not incremented so the caller must be |
| 585 | * careful with locks. |
| 586 | */ |
| 587 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 588 | 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] | 589 | { |
| 590 | struct hlist_node *p; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 591 | struct net_device *dev; |
| 592 | struct hlist_head *head = dev_name_hash(net, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 594 | hlist_for_each_entry(dev, p, head, name_hlist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
| 596 | return dev; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 597 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | return NULL; |
| 599 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 600 | EXPORT_SYMBOL(__dev_get_by_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | |
| 602 | /** |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 603 | * dev_get_by_name_rcu - find a device by its name |
| 604 | * @net: the applicable net namespace |
| 605 | * @name: name to find |
| 606 | * |
| 607 | * Find an interface by name. |
| 608 | * If the name is found a pointer to the device is returned. |
| 609 | * If the name is not found then %NULL is returned. |
| 610 | * The reference counters are not incremented so the caller must be |
| 611 | * careful with locks. The caller must hold RCU lock. |
| 612 | */ |
| 613 | |
| 614 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) |
| 615 | { |
| 616 | struct hlist_node *p; |
| 617 | struct net_device *dev; |
| 618 | struct hlist_head *head = dev_name_hash(net, name); |
| 619 | |
| 620 | hlist_for_each_entry_rcu(dev, p, head, name_hlist) |
| 621 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
| 622 | return dev; |
| 623 | |
| 624 | return NULL; |
| 625 | } |
| 626 | EXPORT_SYMBOL(dev_get_by_name_rcu); |
| 627 | |
| 628 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | * dev_get_by_name - find a device by its name |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 630 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | * @name: name to find |
| 632 | * |
| 633 | * Find an interface by name. This can be called from any |
| 634 | * context and does its own locking. The returned handle has |
| 635 | * the usage count incremented and the caller must use dev_put() to |
| 636 | * release it when it is no longer needed. %NULL is returned if no |
| 637 | * matching device is found. |
| 638 | */ |
| 639 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 640 | 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] | 641 | { |
| 642 | struct net_device *dev; |
| 643 | |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 644 | rcu_read_lock(); |
| 645 | dev = dev_get_by_name_rcu(net, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | if (dev) |
| 647 | dev_hold(dev); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 648 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | return dev; |
| 650 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 651 | EXPORT_SYMBOL(dev_get_by_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
| 653 | /** |
| 654 | * __dev_get_by_index - find a device by its ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 655 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | * @ifindex: index of device |
| 657 | * |
| 658 | * Search for an interface by index. Returns %NULL if the device |
| 659 | * is not found or a pointer to the device. The device has not |
| 660 | * had its reference counter increased so the caller must be careful |
| 661 | * about locking. The caller must hold either the RTNL semaphore |
| 662 | * or @dev_base_lock. |
| 663 | */ |
| 664 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 665 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | { |
| 667 | struct hlist_node *p; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 668 | struct net_device *dev; |
| 669 | struct hlist_head *head = dev_index_hash(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 671 | hlist_for_each_entry(dev, p, head, index_hlist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | if (dev->ifindex == ifindex) |
| 673 | return dev; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | return NULL; |
| 676 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 677 | EXPORT_SYMBOL(__dev_get_by_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 679 | /** |
| 680 | * dev_get_by_index_rcu - find a device by its ifindex |
| 681 | * @net: the applicable net namespace |
| 682 | * @ifindex: index of device |
| 683 | * |
| 684 | * Search for an interface by index. Returns %NULL if the device |
| 685 | * is not found or a pointer to the device. The device has not |
| 686 | * had its reference counter increased so the caller must be careful |
| 687 | * about locking. The caller must hold RCU lock. |
| 688 | */ |
| 689 | |
| 690 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) |
| 691 | { |
| 692 | struct hlist_node *p; |
| 693 | struct net_device *dev; |
| 694 | struct hlist_head *head = dev_index_hash(net, ifindex); |
| 695 | |
| 696 | hlist_for_each_entry_rcu(dev, p, head, index_hlist) |
| 697 | if (dev->ifindex == ifindex) |
| 698 | return dev; |
| 699 | |
| 700 | return NULL; |
| 701 | } |
| 702 | EXPORT_SYMBOL(dev_get_by_index_rcu); |
| 703 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
| 705 | /** |
| 706 | * dev_get_by_index - find a device by its ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 707 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | * @ifindex: index of device |
| 709 | * |
| 710 | * Search for an interface by index. Returns NULL if the device |
| 711 | * is not found or a pointer to the device. The device returned has |
| 712 | * had a reference added and the pointer is safe until the user calls |
| 713 | * dev_put to indicate they have finished with it. |
| 714 | */ |
| 715 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 716 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | { |
| 718 | struct net_device *dev; |
| 719 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 720 | rcu_read_lock(); |
| 721 | dev = dev_get_by_index_rcu(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | if (dev) |
| 723 | dev_hold(dev); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 724 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | return dev; |
| 726 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 727 | EXPORT_SYMBOL(dev_get_by_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | /** |
| 730 | * dev_getbyhwaddr - find a device by its hardware address |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 731 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | * @type: media type of device |
| 733 | * @ha: hardware address |
| 734 | * |
| 735 | * Search for an interface by MAC address. Returns NULL if the device |
| 736 | * is not found or a pointer to the device. The caller must hold the |
| 737 | * rtnl semaphore. The returned device has not had its ref count increased |
| 738 | * and the caller must therefore be careful about locking |
| 739 | * |
| 740 | * BUGS: |
| 741 | * If the API was consistent this would be __dev_get_by_hwaddr |
| 742 | */ |
| 743 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 744 | 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] | 745 | { |
| 746 | struct net_device *dev; |
| 747 | |
| 748 | ASSERT_RTNL(); |
| 749 | |
Denis V. Lunev | 81103a5 | 2007-12-12 10:47:38 -0800 | [diff] [blame] | 750 | for_each_netdev(net, dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | if (dev->type == type && |
| 752 | !memcmp(dev->dev_addr, ha, dev->addr_len)) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 753 | return dev; |
| 754 | |
| 755 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | } |
Jochen Friedrich | cf309e3 | 2005-09-22 04:44:55 -0300 | [diff] [blame] | 757 | EXPORT_SYMBOL(dev_getbyhwaddr); |
| 758 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 759 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 760 | { |
| 761 | struct net_device *dev; |
| 762 | |
| 763 | ASSERT_RTNL(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 764 | for_each_netdev(net, dev) |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 765 | if (dev->type == type) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 766 | return dev; |
| 767 | |
| 768 | return NULL; |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 769 | } |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 770 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
| 771 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 772 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | { |
| 774 | struct net_device *dev; |
| 775 | |
| 776 | rtnl_lock(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 777 | dev = __dev_getfirstbyhwtype(net, type); |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 778 | if (dev) |
| 779 | dev_hold(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | rtnl_unlock(); |
| 781 | return dev; |
| 782 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
| 784 | |
| 785 | /** |
| 786 | * dev_get_by_flags - find any device with given flags |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 787 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | * @if_flags: IFF_* values |
| 789 | * @mask: bitmask of bits in if_flags to check |
| 790 | * |
| 791 | * 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] | 792 | * 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] | 793 | * had a reference added and the pointer is safe until the user calls |
| 794 | * dev_put to indicate they have finished with it. |
| 795 | */ |
| 796 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 797 | struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags, |
| 798 | unsigned short mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | { |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 800 | struct net_device *dev, *ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 802 | ret = NULL; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 803 | rcu_read_lock(); |
| 804 | for_each_netdev_rcu(net, dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | if (((dev->flags ^ if_flags) & mask) == 0) { |
| 806 | dev_hold(dev); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 807 | ret = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | break; |
| 809 | } |
| 810 | } |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 811 | rcu_read_unlock(); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 812 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 814 | EXPORT_SYMBOL(dev_get_by_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
| 816 | /** |
| 817 | * dev_valid_name - check if name is okay for network device |
| 818 | * @name: name string |
| 819 | * |
| 820 | * Network device names need to be valid file names to |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 821 | * to allow sysfs to work. We also disallow any kind of |
| 822 | * whitespace. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | */ |
Mitch Williams | c2373ee | 2005-11-09 10:34:45 -0800 | [diff] [blame] | 824 | int dev_valid_name(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | { |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 826 | if (*name == '\0') |
| 827 | return 0; |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 828 | if (strlen(name) >= IFNAMSIZ) |
| 829 | return 0; |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 830 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
| 831 | return 0; |
| 832 | |
| 833 | while (*name) { |
| 834 | if (*name == '/' || isspace(*name)) |
| 835 | return 0; |
| 836 | name++; |
| 837 | } |
| 838 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 840 | EXPORT_SYMBOL(dev_valid_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
| 842 | /** |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 843 | * __dev_alloc_name - allocate a name for a device |
| 844 | * @net: network namespace to allocate the device name in |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | * @name: name format string |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 846 | * @buf: scratch buffer and result name string |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | * |
| 848 | * 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] | 849 | * id. It scans list of devices to build up a free map, then chooses |
| 850 | * the first empty slot. The caller must hold the dev_base or rtnl lock |
| 851 | * while allocating the name and adding the device in order to avoid |
| 852 | * duplicates. |
| 853 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
| 854 | * Returns the number of the unit assigned or a negative errno code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | */ |
| 856 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 857 | 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] | 858 | { |
| 859 | int i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | const char *p; |
| 861 | const int max_netdevices = 8*PAGE_SIZE; |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 862 | unsigned long *inuse; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | struct net_device *d; |
| 864 | |
| 865 | p = strnchr(name, IFNAMSIZ-1, '%'); |
| 866 | if (p) { |
| 867 | /* |
| 868 | * Verify the string as this thing may have come from |
| 869 | * the user. There must be either one "%d" and no other "%" |
| 870 | * characters. |
| 871 | */ |
| 872 | if (p[1] != 'd' || strchr(p + 2, '%')) |
| 873 | return -EINVAL; |
| 874 | |
| 875 | /* Use one page as a bit array of possible slots */ |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 876 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | if (!inuse) |
| 878 | return -ENOMEM; |
| 879 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 880 | for_each_netdev(net, d) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | if (!sscanf(d->name, name, &i)) |
| 882 | continue; |
| 883 | if (i < 0 || i >= max_netdevices) |
| 884 | continue; |
| 885 | |
| 886 | /* avoid cases where sscanf is not exact inverse of printf */ |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 887 | snprintf(buf, IFNAMSIZ, name, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
| 889 | set_bit(i, inuse); |
| 890 | } |
| 891 | |
| 892 | i = find_first_zero_bit(inuse, max_netdevices); |
| 893 | free_page((unsigned long) inuse); |
| 894 | } |
| 895 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 896 | snprintf(buf, IFNAMSIZ, name, i); |
| 897 | if (!__dev_get_by_name(net, buf)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | return i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | |
| 900 | /* It is possible to run out of possible slots |
| 901 | * when the name is long and there isn't enough space left |
| 902 | * for the digits, or if all bits are used. |
| 903 | */ |
| 904 | return -ENFILE; |
| 905 | } |
| 906 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 907 | /** |
| 908 | * dev_alloc_name - allocate a name for a device |
| 909 | * @dev: device |
| 910 | * @name: name format string |
| 911 | * |
| 912 | * Passed a format string - eg "lt%d" it will try and find a suitable |
| 913 | * id. It scans list of devices to build up a free map, then chooses |
| 914 | * the first empty slot. The caller must hold the dev_base or rtnl lock |
| 915 | * while allocating the name and adding the device in order to avoid |
| 916 | * duplicates. |
| 917 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
| 918 | * Returns the number of the unit assigned or a negative errno code. |
| 919 | */ |
| 920 | |
| 921 | int dev_alloc_name(struct net_device *dev, const char *name) |
| 922 | { |
| 923 | char buf[IFNAMSIZ]; |
| 924 | struct net *net; |
| 925 | int ret; |
| 926 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 927 | BUG_ON(!dev_net(dev)); |
| 928 | net = dev_net(dev); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 929 | ret = __dev_alloc_name(net, name, buf); |
| 930 | if (ret >= 0) |
| 931 | strlcpy(dev->name, buf, IFNAMSIZ); |
| 932 | return ret; |
| 933 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 934 | EXPORT_SYMBOL(dev_alloc_name); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 935 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | |
| 937 | /** |
| 938 | * dev_change_name - change name of a device |
| 939 | * @dev: device |
| 940 | * @newname: name (or format string) must be at least IFNAMSIZ |
| 941 | * |
| 942 | * Change name of a device, can pass format strings "eth%d". |
| 943 | * for wildcarding. |
| 944 | */ |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 945 | int dev_change_name(struct net_device *dev, const char *newname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | { |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 947 | char oldname[IFNAMSIZ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | int err = 0; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 949 | int ret; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 950 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | |
| 952 | ASSERT_RTNL(); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 953 | BUG_ON(!dev_net(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 955 | net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | if (dev->flags & IFF_UP) |
| 957 | return -EBUSY; |
| 958 | |
| 959 | if (!dev_valid_name(newname)) |
| 960 | return -EINVAL; |
| 961 | |
Stephen Hemminger | c8d90dc | 2007-10-26 03:53:42 -0700 | [diff] [blame] | 962 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) |
| 963 | return 0; |
| 964 | |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 965 | memcpy(oldname, dev->name, IFNAMSIZ); |
| 966 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | if (strchr(newname, '%')) { |
| 968 | err = dev_alloc_name(dev, newname); |
| 969 | if (err < 0) |
| 970 | return err; |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 971 | } else if (__dev_get_by_name(net, newname)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | return -EEXIST; |
| 973 | else |
| 974 | strlcpy(dev->name, newname, IFNAMSIZ); |
| 975 | |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 976 | rollback: |
Eric W. Biederman | 3891845 | 2008-10-27 17:51:47 -0700 | [diff] [blame] | 977 | /* For now only devices in the initial network namespace |
| 978 | * are in sysfs. |
| 979 | */ |
| 980 | if (net == &init_net) { |
| 981 | ret = device_rename(&dev->dev, dev->name); |
| 982 | if (ret) { |
| 983 | memcpy(dev->name, oldname, IFNAMSIZ); |
| 984 | return ret; |
| 985 | } |
Stephen Hemminger | dcc9977 | 2008-05-14 22:33:38 -0700 | [diff] [blame] | 986 | } |
Herbert Xu | 7f988ea | 2007-07-30 16:35:46 -0700 | [diff] [blame] | 987 | |
| 988 | write_lock_bh(&dev_base_lock); |
Eric W. Biederman | 9274982 | 2007-04-03 00:07:30 -0600 | [diff] [blame] | 989 | hlist_del(&dev->name_hlist); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 990 | write_unlock_bh(&dev_base_lock); |
| 991 | |
| 992 | synchronize_rcu(); |
| 993 | |
| 994 | write_lock_bh(&dev_base_lock); |
| 995 | 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] | 996 | write_unlock_bh(&dev_base_lock); |
| 997 | |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 998 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 999 | ret = notifier_to_errno(ret); |
| 1000 | |
| 1001 | if (ret) { |
Eric Dumazet | 91e9c07b | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1002 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
| 1003 | if (err >= 0) { |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1004 | err = ret; |
| 1005 | memcpy(dev->name, oldname, IFNAMSIZ); |
| 1006 | goto rollback; |
Eric Dumazet | 91e9c07b | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1007 | } else { |
| 1008 | printk(KERN_ERR |
| 1009 | "%s: name change rollback failed: %d.\n", |
| 1010 | dev->name, ret); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1011 | } |
| 1012 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | |
| 1014 | return err; |
| 1015 | } |
| 1016 | |
| 1017 | /** |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1018 | * dev_set_alias - change ifalias of a device |
| 1019 | * @dev: device |
| 1020 | * @alias: name up to IFALIASZ |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 1021 | * @len: limit of bytes to copy from info |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1022 | * |
| 1023 | * Set ifalias for a device, |
| 1024 | */ |
| 1025 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) |
| 1026 | { |
| 1027 | ASSERT_RTNL(); |
| 1028 | |
| 1029 | if (len >= IFALIASZ) |
| 1030 | return -EINVAL; |
| 1031 | |
Oliver Hartkopp | 96ca4a2 | 2008-09-23 21:23:19 -0700 | [diff] [blame] | 1032 | if (!len) { |
| 1033 | if (dev->ifalias) { |
| 1034 | kfree(dev->ifalias); |
| 1035 | dev->ifalias = NULL; |
| 1036 | } |
| 1037 | return 0; |
| 1038 | } |
| 1039 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1040 | dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1041 | if (!dev->ifalias) |
| 1042 | return -ENOMEM; |
| 1043 | |
| 1044 | strlcpy(dev->ifalias, alias, len+1); |
| 1045 | return len; |
| 1046 | } |
| 1047 | |
| 1048 | |
| 1049 | /** |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 1050 | * netdev_features_change - device changes features |
Stephen Hemminger | d8a33ac | 2005-05-29 14:13:47 -0700 | [diff] [blame] | 1051 | * @dev: device to cause notification |
| 1052 | * |
| 1053 | * Called to indicate a device has changed features. |
| 1054 | */ |
| 1055 | void netdev_features_change(struct net_device *dev) |
| 1056 | { |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1057 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
Stephen Hemminger | d8a33ac | 2005-05-29 14:13:47 -0700 | [diff] [blame] | 1058 | } |
| 1059 | EXPORT_SYMBOL(netdev_features_change); |
| 1060 | |
| 1061 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | * netdev_state_change - device changes state |
| 1063 | * @dev: device to cause notification |
| 1064 | * |
| 1065 | * Called to indicate a device has changed state. This function calls |
| 1066 | * the notifier chains for netdev_chain and sends a NEWLINK message |
| 1067 | * to the routing socket. |
| 1068 | */ |
| 1069 | void netdev_state_change(struct net_device *dev) |
| 1070 | { |
| 1071 | if (dev->flags & IFF_UP) { |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1072 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
| 1074 | } |
| 1075 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1076 | EXPORT_SYMBOL(netdev_state_change); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | |
Moni Shoua | 75c7850 | 2009-09-15 02:37:40 -0700 | [diff] [blame] | 1078 | void netdev_bonding_change(struct net_device *dev, unsigned long event) |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1079 | { |
Moni Shoua | 75c7850 | 2009-09-15 02:37:40 -0700 | [diff] [blame] | 1080 | call_netdevice_notifiers(event, dev); |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1081 | } |
| 1082 | EXPORT_SYMBOL(netdev_bonding_change); |
| 1083 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | /** |
| 1085 | * dev_load - load a network module |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1086 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | * @name: name of interface |
| 1088 | * |
| 1089 | * If a network interface is not present and the process has suitable |
| 1090 | * privileges this function loads the module. If module loading is not |
| 1091 | * available in this kernel then it becomes a nop. |
| 1092 | */ |
| 1093 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1094 | void dev_load(struct net *net, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1096 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 1098 | rcu_read_lock(); |
| 1099 | dev = dev_get_by_name_rcu(net, name); |
| 1100 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | |
Eric Paris | a8f80e8 | 2009-08-13 09:44:51 -0400 | [diff] [blame] | 1102 | if (!dev && capable(CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | request_module("%s", name); |
| 1104 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1105 | EXPORT_SYMBOL(dev_load); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | /** |
| 1108 | * dev_open - prepare an interface for use. |
| 1109 | * @dev: device to open |
| 1110 | * |
| 1111 | * Takes a device from down to up state. The device's private open |
| 1112 | * function is invoked and then the multicast lists are loaded. Finally |
| 1113 | * the device is moved into the up state and a %NETDEV_UP message is |
| 1114 | * sent to the netdev notifier chain. |
| 1115 | * |
| 1116 | * Calling this function on an active interface is a nop. On a failure |
| 1117 | * a negative errno code is returned. |
| 1118 | */ |
| 1119 | int dev_open(struct net_device *dev) |
| 1120 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1121 | const struct net_device_ops *ops = dev->netdev_ops; |
Johannes Berg | 3b8bcfd | 2009-05-30 01:39:53 +0200 | [diff] [blame] | 1122 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | |
Ben Hutchings | e46b66b | 2008-05-08 02:53:17 -0700 | [diff] [blame] | 1124 | ASSERT_RTNL(); |
| 1125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | /* |
| 1127 | * Is it already up? |
| 1128 | */ |
| 1129 | |
| 1130 | if (dev->flags & IFF_UP) |
| 1131 | return 0; |
| 1132 | |
| 1133 | /* |
| 1134 | * Is it even present? |
| 1135 | */ |
| 1136 | if (!netif_device_present(dev)) |
| 1137 | return -ENODEV; |
| 1138 | |
Johannes Berg | 3b8bcfd | 2009-05-30 01:39:53 +0200 | [diff] [blame] | 1139 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
| 1140 | ret = notifier_to_errno(ret); |
| 1141 | if (ret) |
| 1142 | return ret; |
| 1143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | /* |
| 1145 | * Call device private open method |
| 1146 | */ |
| 1147 | set_bit(__LINK_STATE_START, &dev->state); |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1148 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1149 | if (ops->ndo_validate_addr) |
| 1150 | ret = ops->ndo_validate_addr(dev); |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1151 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1152 | if (!ret && ops->ndo_open) |
| 1153 | ret = ops->ndo_open(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1155 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | * If it went open OK then: |
| 1157 | */ |
| 1158 | |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1159 | if (ret) |
| 1160 | clear_bit(__LINK_STATE_START, &dev->state); |
| 1161 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | /* |
| 1163 | * Set the flags. |
| 1164 | */ |
| 1165 | dev->flags |= IFF_UP; |
| 1166 | |
| 1167 | /* |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1168 | * Enable NET_DMA |
| 1169 | */ |
David S. Miller | b4bd07c | 2009-02-06 22:06:43 -0800 | [diff] [blame] | 1170 | net_dmaengine_get(); |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1171 | |
| 1172 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | * Initialize multicasting status |
| 1174 | */ |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 1175 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | |
| 1177 | /* |
| 1178 | * Wakeup transmit queue engine |
| 1179 | */ |
| 1180 | dev_activate(dev); |
| 1181 | |
| 1182 | /* |
| 1183 | * ... and announce new interface. |
| 1184 | */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1185 | call_netdevice_notifiers(NETDEV_UP, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | } |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | return ret; |
| 1189 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1190 | EXPORT_SYMBOL(dev_open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | |
| 1192 | /** |
| 1193 | * dev_close - shutdown an interface. |
| 1194 | * @dev: device to shutdown |
| 1195 | * |
| 1196 | * This function moves an active device into down state. A |
| 1197 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device |
| 1198 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier |
| 1199 | * chain. |
| 1200 | */ |
| 1201 | int dev_close(struct net_device *dev) |
| 1202 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1203 | const struct net_device_ops *ops = dev->netdev_ops; |
Ben Hutchings | e46b66b | 2008-05-08 02:53:17 -0700 | [diff] [blame] | 1204 | ASSERT_RTNL(); |
| 1205 | |
David S. Miller | 9d5010d | 2007-09-12 14:33:25 +0200 | [diff] [blame] | 1206 | might_sleep(); |
| 1207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | if (!(dev->flags & IFF_UP)) |
| 1209 | return 0; |
| 1210 | |
| 1211 | /* |
| 1212 | * Tell people we are going down, so that they can |
| 1213 | * prepare to death, when device is still operating. |
| 1214 | */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1215 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | clear_bit(__LINK_STATE_START, &dev->state); |
| 1218 | |
| 1219 | /* Synchronize to scheduled poll. We cannot touch poll list, |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1220 | * it can be even on different cpu. So just clear netif_running(). |
| 1221 | * |
| 1222 | * dev->stop() will invoke napi_disable() on all of it's |
| 1223 | * napi_struct instances on this device. |
| 1224 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | |
Matti Linnanvuori | d8b2a4d | 2008-02-12 23:10:11 -0800 | [diff] [blame] | 1227 | dev_deactivate(dev); |
| 1228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | /* |
| 1230 | * Call the device specific close. This cannot fail. |
| 1231 | * Only if device is UP |
| 1232 | * |
| 1233 | * We allow it to be called even after a DETACH hot-plug |
| 1234 | * event. |
| 1235 | */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1236 | if (ops->ndo_stop) |
| 1237 | ops->ndo_stop(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | |
| 1239 | /* |
| 1240 | * Device is now down. |
| 1241 | */ |
| 1242 | |
| 1243 | dev->flags &= ~IFF_UP; |
| 1244 | |
| 1245 | /* |
| 1246 | * Tell people we are down |
| 1247 | */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1248 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1250 | /* |
| 1251 | * Shutdown NET_DMA |
| 1252 | */ |
David S. Miller | b4bd07c | 2009-02-06 22:06:43 -0800 | [diff] [blame] | 1253 | net_dmaengine_put(); |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | return 0; |
| 1256 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1257 | EXPORT_SYMBOL(dev_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | |
| 1259 | |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 1260 | /** |
| 1261 | * dev_disable_lro - disable Large Receive Offload on a device |
| 1262 | * @dev: device |
| 1263 | * |
| 1264 | * Disable Large Receive Offload (LRO) on a net device. Must be |
| 1265 | * called under RTNL. This is needed if received packets may be |
| 1266 | * forwarded to another interface. |
| 1267 | */ |
| 1268 | void dev_disable_lro(struct net_device *dev) |
| 1269 | { |
| 1270 | if (dev->ethtool_ops && dev->ethtool_ops->get_flags && |
| 1271 | dev->ethtool_ops->set_flags) { |
| 1272 | u32 flags = dev->ethtool_ops->get_flags(dev); |
| 1273 | if (flags & ETH_FLAG_LRO) { |
| 1274 | flags &= ~ETH_FLAG_LRO; |
| 1275 | dev->ethtool_ops->set_flags(dev, flags); |
| 1276 | } |
| 1277 | } |
| 1278 | WARN_ON(dev->features & NETIF_F_LRO); |
| 1279 | } |
| 1280 | EXPORT_SYMBOL(dev_disable_lro); |
| 1281 | |
| 1282 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1283 | static int dev_boot_phase = 1; |
| 1284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | /* |
| 1286 | * Device change register/unregister. These are not inline or static |
| 1287 | * as we export them to the world. |
| 1288 | */ |
| 1289 | |
| 1290 | /** |
| 1291 | * register_netdevice_notifier - register a network notifier block |
| 1292 | * @nb: notifier |
| 1293 | * |
| 1294 | * Register a notifier to be called when network device events occur. |
| 1295 | * The notifier passed is linked into the kernel structures and must |
| 1296 | * not be reused until it has been unregistered. A negative errno code |
| 1297 | * is returned on a failure. |
| 1298 | * |
| 1299 | * When registered all registration and up events are replayed |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1300 | * to the new notifier to allow device to have a race free |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | * view of the network device list. |
| 1302 | */ |
| 1303 | |
| 1304 | int register_netdevice_notifier(struct notifier_block *nb) |
| 1305 | { |
| 1306 | struct net_device *dev; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1307 | struct net_device *last; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1308 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | int err; |
| 1310 | |
| 1311 | rtnl_lock(); |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1312 | err = raw_notifier_chain_register(&netdev_chain, nb); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1313 | if (err) |
| 1314 | goto unlock; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1315 | if (dev_boot_phase) |
| 1316 | goto unlock; |
| 1317 | for_each_net(net) { |
| 1318 | for_each_netdev(net, dev) { |
| 1319 | err = nb->notifier_call(nb, NETDEV_REGISTER, dev); |
| 1320 | err = notifier_to_errno(err); |
| 1321 | if (err) |
| 1322 | goto rollback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1324 | if (!(dev->flags & IFF_UP)) |
| 1325 | continue; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1326 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1327 | nb->notifier_call(nb, NETDEV_UP, dev); |
| 1328 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | } |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1330 | |
| 1331 | unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | rtnl_unlock(); |
| 1333 | return err; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1334 | |
| 1335 | rollback: |
| 1336 | last = dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1337 | for_each_net(net) { |
| 1338 | for_each_netdev(net, dev) { |
| 1339 | if (dev == last) |
| 1340 | break; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1341 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1342 | if (dev->flags & IFF_UP) { |
| 1343 | nb->notifier_call(nb, NETDEV_GOING_DOWN, dev); |
| 1344 | nb->notifier_call(nb, NETDEV_DOWN, dev); |
| 1345 | } |
| 1346 | nb->notifier_call(nb, NETDEV_UNREGISTER, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1347 | } |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1348 | } |
Pavel Emelyanov | c67625a | 2007-11-14 15:53:16 -0800 | [diff] [blame] | 1349 | |
| 1350 | raw_notifier_chain_unregister(&netdev_chain, nb); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1351 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1353 | EXPORT_SYMBOL(register_netdevice_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | |
| 1355 | /** |
| 1356 | * unregister_netdevice_notifier - unregister a network notifier block |
| 1357 | * @nb: notifier |
| 1358 | * |
| 1359 | * Unregister a notifier previously registered by |
| 1360 | * register_netdevice_notifier(). The notifier is unlinked into the |
| 1361 | * kernel structures and may then be reused. A negative errno code |
| 1362 | * is returned on a failure. |
| 1363 | */ |
| 1364 | |
| 1365 | int unregister_netdevice_notifier(struct notifier_block *nb) |
| 1366 | { |
Herbert Xu | 9f51495 | 2006-03-25 01:24:25 -0800 | [diff] [blame] | 1367 | int err; |
| 1368 | |
| 1369 | rtnl_lock(); |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1370 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
Herbert Xu | 9f51495 | 2006-03-25 01:24:25 -0800 | [diff] [blame] | 1371 | rtnl_unlock(); |
| 1372 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1374 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | |
| 1376 | /** |
| 1377 | * call_netdevice_notifiers - call all network notifier blocks |
| 1378 | * @val: value passed unmodified to notifier function |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1379 | * @dev: net_device pointer passed unmodified to notifier function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | * |
| 1381 | * Call all network notifier blocks. Parameters and return value |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1382 | * are as for raw_notifier_call_chain(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | */ |
| 1384 | |
Eric W. Biederman | ad7379d | 2007-09-16 15:33:32 -0700 | [diff] [blame] | 1385 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | { |
Eric W. Biederman | ad7379d | 2007-09-16 15:33:32 -0700 | [diff] [blame] | 1387 | return raw_notifier_call_chain(&netdev_chain, val, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | } |
| 1389 | |
| 1390 | /* When > 0 there are consumers of rx skb time stamps */ |
| 1391 | static atomic_t netstamp_needed = ATOMIC_INIT(0); |
| 1392 | |
| 1393 | void net_enable_timestamp(void) |
| 1394 | { |
| 1395 | atomic_inc(&netstamp_needed); |
| 1396 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1397 | EXPORT_SYMBOL(net_enable_timestamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | |
| 1399 | void net_disable_timestamp(void) |
| 1400 | { |
| 1401 | atomic_dec(&netstamp_needed); |
| 1402 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1403 | EXPORT_SYMBOL(net_disable_timestamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1405 | static inline void net_timestamp(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | { |
| 1407 | if (atomic_read(&netstamp_needed)) |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1408 | __net_timestamp(skb); |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1409 | else |
| 1410 | skb->tstamp.tv64 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | } |
| 1412 | |
| 1413 | /* |
| 1414 | * Support routine. Sends outgoing frames to any network |
| 1415 | * taps currently in use. |
| 1416 | */ |
| 1417 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1418 | 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] | 1419 | { |
| 1420 | struct packet_type *ptype; |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1421 | |
Jarek Poplawski | 8caf153 | 2009-04-17 10:08:49 +0000 | [diff] [blame] | 1422 | #ifdef CONFIG_NET_CLS_ACT |
| 1423 | if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS))) |
| 1424 | net_timestamp(skb); |
| 1425 | #else |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1426 | net_timestamp(skb); |
Jarek Poplawski | 8caf153 | 2009-04-17 10:08:49 +0000 | [diff] [blame] | 1427 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | |
| 1429 | rcu_read_lock(); |
| 1430 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
| 1431 | /* Never send packets back to the socket |
| 1432 | * they originated from - MvS (miquels@drinkel.ow.org) |
| 1433 | */ |
| 1434 | if ((ptype->dev == dev || !ptype->dev) && |
| 1435 | (ptype->af_packet_priv == NULL || |
| 1436 | (struct sock *)ptype->af_packet_priv != skb->sk)) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1437 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | if (!skb2) |
| 1439 | break; |
| 1440 | |
| 1441 | /* skb->nh should be correctly |
| 1442 | set by sender, so that the second statement is |
| 1443 | just protection against buggy protocols. |
| 1444 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1445 | skb_reset_mac_header(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1447 | if (skb_network_header(skb2) < skb2->data || |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1448 | skb2->network_header > skb2->tail) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | if (net_ratelimit()) |
| 1450 | printk(KERN_CRIT "protocol %04x is " |
| 1451 | "buggy, dev %s\n", |
| 1452 | skb2->protocol, dev->name); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1453 | skb_reset_network_header(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | } |
| 1455 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1456 | skb2->transport_header = skb2->network_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | skb2->pkt_type = PACKET_OUTGOING; |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 1458 | ptype->func(skb2, skb->dev, ptype, skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | } |
| 1460 | } |
| 1461 | rcu_read_unlock(); |
| 1462 | } |
| 1463 | |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1464 | |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 1465 | static inline void __netif_reschedule(struct Qdisc *q) |
| 1466 | { |
| 1467 | struct softnet_data *sd; |
| 1468 | unsigned long flags; |
| 1469 | |
| 1470 | local_irq_save(flags); |
| 1471 | sd = &__get_cpu_var(softnet_data); |
| 1472 | q->next_sched = sd->output_queue; |
| 1473 | sd->output_queue = q; |
| 1474 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 1475 | local_irq_restore(flags); |
| 1476 | } |
| 1477 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 1478 | void __netif_schedule(struct Qdisc *q) |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1479 | { |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 1480 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) |
| 1481 | __netif_reschedule(q); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1482 | } |
| 1483 | EXPORT_SYMBOL(__netif_schedule); |
| 1484 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1485 | void dev_kfree_skb_irq(struct sk_buff *skb) |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1486 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1487 | if (atomic_dec_and_test(&skb->users)) { |
| 1488 | struct softnet_data *sd; |
| 1489 | unsigned long flags; |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1490 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1491 | local_irq_save(flags); |
| 1492 | sd = &__get_cpu_var(softnet_data); |
| 1493 | skb->next = sd->completion_queue; |
| 1494 | sd->completion_queue = skb; |
| 1495 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 1496 | local_irq_restore(flags); |
| 1497 | } |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1498 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1499 | EXPORT_SYMBOL(dev_kfree_skb_irq); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1500 | |
| 1501 | void dev_kfree_skb_any(struct sk_buff *skb) |
| 1502 | { |
| 1503 | if (in_irq() || irqs_disabled()) |
| 1504 | dev_kfree_skb_irq(skb); |
| 1505 | else |
| 1506 | dev_kfree_skb(skb); |
| 1507 | } |
| 1508 | EXPORT_SYMBOL(dev_kfree_skb_any); |
| 1509 | |
| 1510 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1511 | /** |
| 1512 | * netif_device_detach - mark device as removed |
| 1513 | * @dev: network device |
| 1514 | * |
| 1515 | * Mark device as removed from system and therefore no longer available. |
| 1516 | */ |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1517 | void netif_device_detach(struct net_device *dev) |
| 1518 | { |
| 1519 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && |
| 1520 | netif_running(dev)) { |
Alexander Duyck | d543103 | 2009-04-08 13:15:22 +0000 | [diff] [blame] | 1521 | netif_tx_stop_all_queues(dev); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1522 | } |
| 1523 | } |
| 1524 | EXPORT_SYMBOL(netif_device_detach); |
| 1525 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1526 | /** |
| 1527 | * netif_device_attach - mark device as attached |
| 1528 | * @dev: network device |
| 1529 | * |
| 1530 | * Mark device as attached from system and restart if needed. |
| 1531 | */ |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1532 | void netif_device_attach(struct net_device *dev) |
| 1533 | { |
| 1534 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && |
| 1535 | netif_running(dev)) { |
Alexander Duyck | d543103 | 2009-04-08 13:15:22 +0000 | [diff] [blame] | 1536 | netif_tx_wake_all_queues(dev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1537 | __netdev_watchdog_up(dev); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1538 | } |
| 1539 | } |
| 1540 | EXPORT_SYMBOL(netif_device_attach); |
| 1541 | |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 1542 | static bool can_checksum_protocol(unsigned long features, __be16 protocol) |
| 1543 | { |
| 1544 | return ((features & NETIF_F_GEN_CSUM) || |
| 1545 | ((features & NETIF_F_IP_CSUM) && |
| 1546 | protocol == htons(ETH_P_IP)) || |
| 1547 | ((features & NETIF_F_IPV6_CSUM) && |
Yi Zou | 1c8dbcf | 2009-02-27 14:06:54 -0800 | [diff] [blame] | 1548 | protocol == htons(ETH_P_IPV6)) || |
| 1549 | ((features & NETIF_F_FCOE_CRC) && |
| 1550 | protocol == htons(ETH_P_FCOE))); |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 1551 | } |
| 1552 | |
| 1553 | static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb) |
| 1554 | { |
| 1555 | if (can_checksum_protocol(dev->features, skb->protocol)) |
| 1556 | return true; |
| 1557 | |
| 1558 | if (skb->protocol == htons(ETH_P_8021Q)) { |
| 1559 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; |
| 1560 | if (can_checksum_protocol(dev->features & dev->vlan_features, |
| 1561 | veh->h_vlan_encapsulated_proto)) |
| 1562 | return true; |
| 1563 | } |
| 1564 | |
| 1565 | return false; |
| 1566 | } |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | /* |
| 1569 | * Invalidate hardware checksum when packet is to be mangled, and |
| 1570 | * complete checksum manually on outgoing path. |
| 1571 | */ |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1572 | int skb_checksum_help(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | { |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 1574 | __wsum csum; |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 1575 | int ret = 0, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1577 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1578 | goto out_set_summed; |
| 1579 | |
| 1580 | if (unlikely(skb_shinfo(skb)->gso_size)) { |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1581 | /* Let GSO fix up the checksum. */ |
| 1582 | goto out_set_summed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | } |
| 1584 | |
Herbert Xu | a030847 | 2007-10-15 01:47:15 -0700 | [diff] [blame] | 1585 | offset = skb->csum_start - skb_headroom(skb); |
| 1586 | BUG_ON(offset >= skb_headlen(skb)); |
| 1587 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| 1588 | |
| 1589 | offset += skb->csum_offset; |
| 1590 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); |
| 1591 | |
| 1592 | if (skb_cloned(skb) && |
| 1593 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
| 1595 | if (ret) |
| 1596 | goto out; |
| 1597 | } |
| 1598 | |
Herbert Xu | a030847 | 2007-10-15 01:47:15 -0700 | [diff] [blame] | 1599 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1600 | out_set_summed: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | skb->ip_summed = CHECKSUM_NONE; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1602 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | return ret; |
| 1604 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1605 | EXPORT_SYMBOL(skb_checksum_help); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1607 | /** |
| 1608 | * skb_gso_segment - Perform segmentation on skb. |
| 1609 | * @skb: buffer to segment |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1610 | * @features: features for the output path (see dev->features) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1611 | * |
| 1612 | * This function segments the given skb and returns a list of segments. |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1613 | * |
| 1614 | * It may return NULL if the skb requires no segmentation. This is |
| 1615 | * only possible when GSO is used for verifying header integrity. |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1616 | */ |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1617 | struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1618 | { |
| 1619 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); |
| 1620 | struct packet_type *ptype; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 1621 | __be16 type = skb->protocol; |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1622 | int err; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1623 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1624 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1625 | skb->mac_len = skb->network_header - skb->mac_header; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1626 | __skb_pull(skb, skb->mac_len); |
| 1627 | |
Herbert Xu | 67fd1a7 | 2009-01-19 16:26:44 -0800 | [diff] [blame] | 1628 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
| 1629 | struct net_device *dev = skb->dev; |
| 1630 | struct ethtool_drvinfo info = {}; |
| 1631 | |
| 1632 | if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo) |
| 1633 | dev->ethtool_ops->get_drvinfo(dev, &info); |
| 1634 | |
| 1635 | WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d " |
| 1636 | "ip_summed=%d", |
| 1637 | info.driver, dev ? dev->features : 0L, |
| 1638 | skb->sk ? skb->sk->sk_route_caps : 0L, |
| 1639 | skb->len, skb->data_len, skb->ip_summed); |
| 1640 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1641 | if (skb_header_cloned(skb) && |
| 1642 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) |
| 1643 | return ERR_PTR(err); |
| 1644 | } |
| 1645 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1646 | rcu_read_lock(); |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 1647 | list_for_each_entry_rcu(ptype, |
| 1648 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1649 | if (ptype->type == type && !ptype->dev && ptype->gso_segment) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1650 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1651 | err = ptype->gso_send_check(skb); |
| 1652 | segs = ERR_PTR(err); |
| 1653 | if (err || skb_gso_ok(skb, features)) |
| 1654 | break; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1655 | __skb_push(skb, (skb->data - |
| 1656 | skb_network_header(skb))); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1657 | } |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1658 | segs = ptype->gso_segment(skb, features); |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1659 | break; |
| 1660 | } |
| 1661 | } |
| 1662 | rcu_read_unlock(); |
| 1663 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1664 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1665 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1666 | return segs; |
| 1667 | } |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1668 | EXPORT_SYMBOL(skb_gso_segment); |
| 1669 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1670 | /* Take action when hardware reception checksum errors are detected. */ |
| 1671 | #ifdef CONFIG_BUG |
| 1672 | void netdev_rx_csum_fault(struct net_device *dev) |
| 1673 | { |
| 1674 | if (net_ratelimit()) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1675 | printk(KERN_ERR "%s: hw csum failure.\n", |
Stephen Hemminger | 246a421 | 2005-12-08 15:21:39 -0800 | [diff] [blame] | 1676 | dev ? dev->name : "<unknown>"); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1677 | dump_stack(); |
| 1678 | } |
| 1679 | } |
| 1680 | EXPORT_SYMBOL(netdev_rx_csum_fault); |
| 1681 | #endif |
| 1682 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | /* Actually, we should eliminate this check as soon as we know, that: |
| 1684 | * 1. IOMMU is present and allows to map all the memory. |
| 1685 | * 2. No high memory really exists on this machine. |
| 1686 | */ |
| 1687 | |
| 1688 | static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
| 1689 | { |
Herbert Xu | 3d3a853 | 2006-06-27 13:33:10 -0700 | [diff] [blame] | 1690 | #ifdef CONFIG_HIGHMEM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | int i; |
| 1692 | |
| 1693 | if (dev->features & NETIF_F_HIGHDMA) |
| 1694 | return 0; |
| 1695 | |
| 1696 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) |
| 1697 | if (PageHighMem(skb_shinfo(skb)->frags[i].page)) |
| 1698 | return 1; |
| 1699 | |
Herbert Xu | 3d3a853 | 2006-06-27 13:33:10 -0700 | [diff] [blame] | 1700 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | return 0; |
| 1702 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1704 | struct dev_gso_cb { |
| 1705 | void (*destructor)(struct sk_buff *skb); |
| 1706 | }; |
| 1707 | |
| 1708 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) |
| 1709 | |
| 1710 | static void dev_gso_skb_destructor(struct sk_buff *skb) |
| 1711 | { |
| 1712 | struct dev_gso_cb *cb; |
| 1713 | |
| 1714 | do { |
| 1715 | struct sk_buff *nskb = skb->next; |
| 1716 | |
| 1717 | skb->next = nskb->next; |
| 1718 | nskb->next = NULL; |
| 1719 | kfree_skb(nskb); |
| 1720 | } while (skb->next); |
| 1721 | |
| 1722 | cb = DEV_GSO_CB(skb); |
| 1723 | if (cb->destructor) |
| 1724 | cb->destructor(skb); |
| 1725 | } |
| 1726 | |
| 1727 | /** |
| 1728 | * dev_gso_segment - Perform emulated hardware segmentation on skb. |
| 1729 | * @skb: buffer to segment |
| 1730 | * |
| 1731 | * This function segments the given skb and stores the list of segments |
| 1732 | * in skb->next. |
| 1733 | */ |
| 1734 | static int dev_gso_segment(struct sk_buff *skb) |
| 1735 | { |
| 1736 | struct net_device *dev = skb->dev; |
| 1737 | struct sk_buff *segs; |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1738 | int features = dev->features & ~(illegal_highdma(dev, skb) ? |
| 1739 | NETIF_F_SG : 0); |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1740 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1741 | segs = skb_gso_segment(skb, features); |
| 1742 | |
| 1743 | /* Verifying header integrity only. */ |
| 1744 | if (!segs) |
| 1745 | return 0; |
| 1746 | |
Hirofumi Nakagawa | 801678c | 2008-04-29 01:03:09 -0700 | [diff] [blame] | 1747 | if (IS_ERR(segs)) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1748 | return PTR_ERR(segs); |
| 1749 | |
| 1750 | skb->next = segs; |
| 1751 | DEV_GSO_CB(skb)->destructor = skb->destructor; |
| 1752 | skb->destructor = dev_gso_skb_destructor; |
| 1753 | |
| 1754 | return 0; |
| 1755 | } |
| 1756 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 1757 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, |
| 1758 | struct netdev_queue *txq) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1759 | { |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1760 | const struct net_device_ops *ops = dev->netdev_ops; |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1761 | int rc = NETDEV_TX_OK; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1762 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1763 | if (likely(!skb->next)) { |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 1764 | if (!list_empty(&ptype_all)) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1765 | dev_queue_xmit_nit(skb, dev); |
| 1766 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1767 | if (netif_needs_gso(dev, skb)) { |
| 1768 | if (unlikely(dev_gso_segment(skb))) |
| 1769 | goto out_kfree_skb; |
| 1770 | if (skb->next) |
| 1771 | goto gso; |
| 1772 | } |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1773 | |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 1774 | /* |
| 1775 | * If device doesnt need skb->dst, release it right now while |
| 1776 | * its hot in this cpu cache |
| 1777 | */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1778 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
| 1779 | skb_dst_drop(skb); |
| 1780 | |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1781 | rc = ops->ndo_start_xmit(skb, dev); |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 1782 | if (rc == NETDEV_TX_OK) |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 1783 | txq_trans_update(txq); |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1784 | /* |
| 1785 | * TODO: if skb_orphan() was called by |
| 1786 | * dev->hard_start_xmit() (for example, the unmodified |
| 1787 | * igb driver does that; bnx2 doesn't), then |
| 1788 | * skb_tx_software_timestamp() will be unable to send |
| 1789 | * back the time stamp. |
| 1790 | * |
| 1791 | * How can this be prevented? Always create another |
| 1792 | * reference to the socket before calling |
| 1793 | * dev->hard_start_xmit()? Prevent that skb_orphan() |
| 1794 | * does anything in dev->hard_start_xmit() by clearing |
| 1795 | * the skb destructor before the call and restoring it |
| 1796 | * afterwards, then doing the skb_orphan() ourselves? |
| 1797 | */ |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1798 | return rc; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1799 | } |
| 1800 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1801 | gso: |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1802 | do { |
| 1803 | struct sk_buff *nskb = skb->next; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1804 | |
| 1805 | skb->next = nskb->next; |
| 1806 | nskb->next = NULL; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1807 | rc = ops->ndo_start_xmit(nskb, dev); |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 1808 | if (unlikely(rc != NETDEV_TX_OK)) { |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1809 | if (rc & ~NETDEV_TX_MASK) |
| 1810 | goto out_kfree_gso_skb; |
Michael Chan | f54d9e8 | 2006-06-25 23:57:04 -0700 | [diff] [blame] | 1811 | nskb->next = skb->next; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1812 | skb->next = nskb; |
| 1813 | return rc; |
| 1814 | } |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 1815 | txq_trans_update(txq); |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 1816 | if (unlikely(netif_tx_queue_stopped(txq) && skb->next)) |
Michael Chan | f54d9e8 | 2006-06-25 23:57:04 -0700 | [diff] [blame] | 1817 | return NETDEV_TX_BUSY; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1818 | } while (skb->next); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1819 | |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1820 | out_kfree_gso_skb: |
| 1821 | if (likely(skb->next == NULL)) |
| 1822 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1823 | out_kfree_skb: |
| 1824 | kfree_skb(skb); |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1825 | return rc; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1826 | } |
| 1827 | |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 1828 | static u32 skb_tx_hashrnd; |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 1829 | |
Stephen Hemminger | 9247744 | 2009-03-21 13:39:26 -0700 | [diff] [blame] | 1830 | 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] | 1831 | { |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 1832 | u32 hash; |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 1833 | |
David S. Miller | 513de11 | 2009-05-03 14:43:10 -0700 | [diff] [blame] | 1834 | if (skb_rx_queue_recorded(skb)) { |
| 1835 | hash = skb_get_rx_queue(skb); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1836 | while (unlikely(hash >= dev->real_num_tx_queues)) |
David S. Miller | 513de11 | 2009-05-03 14:43:10 -0700 | [diff] [blame] | 1837 | hash -= dev->real_num_tx_queues; |
| 1838 | return hash; |
| 1839 | } |
Eric Dumazet | ec581f6 | 2009-05-01 09:05:06 -0700 | [diff] [blame] | 1840 | |
| 1841 | if (skb->sk && skb->sk->sk_hash) |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 1842 | hash = skb->sk->sk_hash; |
Eric Dumazet | ec581f6 | 2009-05-01 09:05:06 -0700 | [diff] [blame] | 1843 | else |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 1844 | hash = skb->protocol; |
David S. Miller | d5a9e24 | 2009-01-27 16:22:11 -0800 | [diff] [blame] | 1845 | |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 1846 | hash = jhash_1word(hash, skb_tx_hashrnd); |
David S. Miller | d5a9e24 | 2009-01-27 16:22:11 -0800 | [diff] [blame] | 1847 | |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 1848 | return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32); |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 1849 | } |
Stephen Hemminger | 9247744 | 2009-03-21 13:39:26 -0700 | [diff] [blame] | 1850 | EXPORT_SYMBOL(skb_tx_hash); |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 1851 | |
Eric Dumazet | ed04642 | 2009-11-13 21:54:04 +0000 | [diff] [blame] | 1852 | static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index) |
| 1853 | { |
| 1854 | if (unlikely(queue_index >= dev->real_num_tx_queues)) { |
| 1855 | if (net_ratelimit()) { |
| 1856 | WARN(1, "%s selects TX queue %d, but " |
| 1857 | "real number of TX queues is %d\n", |
| 1858 | dev->name, queue_index, |
| 1859 | dev->real_num_tx_queues); |
| 1860 | } |
| 1861 | return 0; |
| 1862 | } |
| 1863 | return queue_index; |
| 1864 | } |
| 1865 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 1866 | static struct netdev_queue *dev_pick_tx(struct net_device *dev, |
| 1867 | struct sk_buff *skb) |
| 1868 | { |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 1869 | u16 queue_index; |
| 1870 | struct sock *sk = skb->sk; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 1871 | |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 1872 | if (sk_tx_queue_recorded(sk)) { |
| 1873 | queue_index = sk_tx_queue_get(sk); |
| 1874 | } else { |
| 1875 | const struct net_device_ops *ops = dev->netdev_ops; |
| 1876 | |
| 1877 | if (ops->ndo_select_queue) { |
| 1878 | queue_index = ops->ndo_select_queue(dev, skb); |
Eric Dumazet | ed04642 | 2009-11-13 21:54:04 +0000 | [diff] [blame] | 1879 | queue_index = dev_cap_txqueue(dev, queue_index); |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 1880 | } else { |
| 1881 | queue_index = 0; |
| 1882 | if (dev->real_num_tx_queues > 1) |
| 1883 | queue_index = skb_tx_hash(dev, skb); |
| 1884 | |
| 1885 | if (sk && sk->sk_dst_cache) |
| 1886 | sk_tx_queue_set(sk, queue_index); |
| 1887 | } |
| 1888 | } |
David S. Miller | eae792b | 2008-07-15 03:03:33 -0700 | [diff] [blame] | 1889 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 1890 | skb_set_queue_mapping(skb, queue_index); |
| 1891 | return netdev_get_tx_queue(dev, queue_index); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 1892 | } |
| 1893 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 1894 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
| 1895 | struct net_device *dev, |
| 1896 | struct netdev_queue *txq) |
| 1897 | { |
| 1898 | spinlock_t *root_lock = qdisc_lock(q); |
| 1899 | int rc; |
| 1900 | |
| 1901 | spin_lock(root_lock); |
| 1902 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { |
| 1903 | kfree_skb(skb); |
| 1904 | rc = NET_XMIT_DROP; |
| 1905 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && |
| 1906 | !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) { |
| 1907 | /* |
| 1908 | * This is a work-conserving queue; there are no old skbs |
| 1909 | * waiting to be sent out; and the qdisc is not running - |
| 1910 | * xmit the skb directly. |
| 1911 | */ |
| 1912 | __qdisc_update_bstats(q, skb->len); |
| 1913 | if (sch_direct_xmit(skb, q, dev, txq, root_lock)) |
| 1914 | __qdisc_run(q); |
| 1915 | else |
| 1916 | clear_bit(__QDISC_STATE_RUNNING, &q->state); |
| 1917 | |
| 1918 | rc = NET_XMIT_SUCCESS; |
| 1919 | } else { |
| 1920 | rc = qdisc_enqueue_root(skb, q); |
| 1921 | qdisc_run(q); |
| 1922 | } |
| 1923 | spin_unlock(root_lock); |
| 1924 | |
| 1925 | return rc; |
| 1926 | } |
| 1927 | |
Dave Jones | d29f749 | 2008-07-22 14:09:06 -0700 | [diff] [blame] | 1928 | /** |
| 1929 | * dev_queue_xmit - transmit a buffer |
| 1930 | * @skb: buffer to transmit |
| 1931 | * |
| 1932 | * Queue a buffer for transmission to a network device. The caller must |
| 1933 | * have set the device and priority and built the buffer before calling |
| 1934 | * this function. The function can be called from an interrupt. |
| 1935 | * |
| 1936 | * A negative errno code is returned on a failure. A success does not |
| 1937 | * guarantee the frame will be transmitted as it may be dropped due |
| 1938 | * to congestion or traffic shaping. |
| 1939 | * |
| 1940 | * ----------------------------------------------------------------------------------- |
| 1941 | * I notice this method can also return errors from the queue disciplines, |
| 1942 | * including NET_XMIT_DROP, which is a positive value. So, errors can also |
| 1943 | * be positive. |
| 1944 | * |
| 1945 | * Regardless of the return value, the skb is consumed, so it is currently |
| 1946 | * difficult to retry a send to this method. (You can bump the ref count |
| 1947 | * before sending to hold a reference for retry if you are careful.) |
| 1948 | * |
| 1949 | * When calling this method, interrupts MUST be enabled. This is because |
| 1950 | * the BH enable code must have IRQs enabled so that it will not deadlock. |
| 1951 | * --BLG |
| 1952 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | int dev_queue_xmit(struct sk_buff *skb) |
| 1954 | { |
| 1955 | struct net_device *dev = skb->dev; |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 1956 | struct netdev_queue *txq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | struct Qdisc *q; |
| 1958 | int rc = -ENOMEM; |
| 1959 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1960 | /* GSO will handle the following emulations directly. */ |
| 1961 | if (netif_needs_gso(dev, skb)) |
| 1962 | goto gso; |
| 1963 | |
David S. Miller | 4cf704f | 2009-06-09 00:18:51 -0700 | [diff] [blame] | 1964 | if (skb_has_frags(skb) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | !(dev->features & NETIF_F_FRAGLIST) && |
Herbert Xu | 364c6ba | 2006-06-09 16:10:40 -0700 | [diff] [blame] | 1966 | __skb_linearize(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | goto out_kfree_skb; |
| 1968 | |
| 1969 | /* Fragmented skb is linearized if device does not support SG, |
| 1970 | * or if at least one of fragments is in highmem and device |
| 1971 | * does not support DMA from it. |
| 1972 | */ |
| 1973 | if (skb_shinfo(skb)->nr_frags && |
| 1974 | (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) && |
Herbert Xu | 364c6ba | 2006-06-09 16:10:40 -0700 | [diff] [blame] | 1975 | __skb_linearize(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | goto out_kfree_skb; |
| 1977 | |
| 1978 | /* If packet is not checksummed and device does not support |
| 1979 | * checksumming for this protocol, complete checksumming here. |
| 1980 | */ |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 1981 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 1982 | skb_set_transport_header(skb, skb->csum_start - |
| 1983 | skb_headroom(skb)); |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 1984 | if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb)) |
| 1985 | goto out_kfree_skb; |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 1986 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1988 | gso: |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1989 | /* Disable soft irqs for various locks below. Also |
| 1990 | * stops preemption for RCU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1992 | rcu_read_lock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1993 | |
David S. Miller | eae792b | 2008-07-15 03:03:33 -0700 | [diff] [blame] | 1994 | txq = dev_pick_tx(dev, skb); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 1995 | q = rcu_dereference(txq->qdisc); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 1996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | #ifdef CONFIG_NET_CLS_ACT |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1998 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | #endif |
| 2000 | if (q->enqueue) { |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2001 | rc = __dev_xmit_skb(skb, q, dev, txq); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2002 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | } |
| 2004 | |
| 2005 | /* The device has no queue. Common case for software devices: |
| 2006 | loopback, all the sorts of tunnels... |
| 2007 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 2008 | Really, it is unlikely that netif_tx_lock protection is necessary |
| 2009 | here. (f.e. loopback and IP tunnels are clean ignoring statistics |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | counters.) |
| 2011 | However, it is possible, that they rely on protection |
| 2012 | made by us here. |
| 2013 | |
| 2014 | Check this and shot the lock. It is not prone from deadlocks. |
| 2015 | Either shot noqueue qdisc, it is even simpler 8) |
| 2016 | */ |
| 2017 | if (dev->flags & IFF_UP) { |
| 2018 | int cpu = smp_processor_id(); /* ok because BHs are off */ |
| 2019 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2020 | if (txq->xmit_lock_owner != cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2022 | HARD_TX_LOCK(dev, txq, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2024 | if (!netif_tx_queue_stopped(txq)) { |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2025 | rc = dev_hard_start_xmit(skb, dev, txq); |
| 2026 | if (dev_xmit_complete(rc)) { |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2027 | HARD_TX_UNLOCK(dev, txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | goto out; |
| 2029 | } |
| 2030 | } |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2031 | HARD_TX_UNLOCK(dev, txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | if (net_ratelimit()) |
| 2033 | printk(KERN_CRIT "Virtual device %s asks to " |
| 2034 | "queue packet!\n", dev->name); |
| 2035 | } else { |
| 2036 | /* Recursion is detected! It is possible, |
| 2037 | * unfortunately */ |
| 2038 | if (net_ratelimit()) |
| 2039 | printk(KERN_CRIT "Dead loop on virtual device " |
| 2040 | "%s, fix it urgently!\n", dev->name); |
| 2041 | } |
| 2042 | } |
| 2043 | |
| 2044 | rc = -ENETDOWN; |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 2045 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | |
| 2047 | out_kfree_skb: |
| 2048 | kfree_skb(skb); |
| 2049 | return rc; |
| 2050 | out: |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 2051 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | return rc; |
| 2053 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2054 | EXPORT_SYMBOL(dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | |
| 2056 | |
| 2057 | /*======================================================================= |
| 2058 | Receiver routines |
| 2059 | =======================================================================*/ |
| 2060 | |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 2061 | int netdev_max_backlog __read_mostly = 1000; |
| 2062 | int netdev_budget __read_mostly = 300; |
| 2063 | int weight_p __read_mostly = 64; /* old backlog weight */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | |
| 2065 | DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, }; |
| 2066 | |
| 2067 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2068 | /** |
| 2069 | * netif_rx - post buffer to the network code |
| 2070 | * @skb: buffer to post |
| 2071 | * |
| 2072 | * This function receives a packet from a device driver and queues it for |
| 2073 | * the upper (protocol) levels to process. It always succeeds. The buffer |
| 2074 | * may be dropped during processing for congestion control or by the |
| 2075 | * protocol layers. |
| 2076 | * |
| 2077 | * return values: |
| 2078 | * NET_RX_SUCCESS (no congestion) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2079 | * NET_RX_DROP (packet was dropped) |
| 2080 | * |
| 2081 | */ |
| 2082 | |
| 2083 | int netif_rx(struct sk_buff *skb) |
| 2084 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | struct softnet_data *queue; |
| 2086 | unsigned long flags; |
| 2087 | |
| 2088 | /* if netpoll wants it, pretend we never saw it */ |
| 2089 | if (netpoll_rx(skb)) |
| 2090 | return NET_RX_DROP; |
| 2091 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2092 | if (!skb->tstamp.tv64) |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 2093 | net_timestamp(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | |
| 2095 | /* |
| 2096 | * The code is rearranged so that the path is the most |
| 2097 | * short when CPU is congested, but is still operating. |
| 2098 | */ |
| 2099 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | queue = &__get_cpu_var(softnet_data); |
| 2101 | |
| 2102 | __get_cpu_var(netdev_rx_stat).total++; |
| 2103 | if (queue->input_pkt_queue.qlen <= netdev_max_backlog) { |
| 2104 | if (queue->input_pkt_queue.qlen) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | enqueue: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | __skb_queue_tail(&queue->input_pkt_queue, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | local_irq_restore(flags); |
Stephen Hemminger | 34008d8 | 2005-06-23 20:10:00 -0700 | [diff] [blame] | 2108 | return NET_RX_SUCCESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | } |
| 2110 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2111 | napi_schedule(&queue->backlog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | goto enqueue; |
| 2113 | } |
| 2114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | __get_cpu_var(netdev_rx_stat).dropped++; |
| 2116 | local_irq_restore(flags); |
| 2117 | |
| 2118 | kfree_skb(skb); |
| 2119 | return NET_RX_DROP; |
| 2120 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2121 | EXPORT_SYMBOL(netif_rx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | |
| 2123 | int netif_rx_ni(struct sk_buff *skb) |
| 2124 | { |
| 2125 | int err; |
| 2126 | |
| 2127 | preempt_disable(); |
| 2128 | err = netif_rx(skb); |
| 2129 | if (local_softirq_pending()) |
| 2130 | do_softirq(); |
| 2131 | preempt_enable(); |
| 2132 | |
| 2133 | return err; |
| 2134 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | EXPORT_SYMBOL(netif_rx_ni); |
| 2136 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | static void net_tx_action(struct softirq_action *h) |
| 2138 | { |
| 2139 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
| 2140 | |
| 2141 | if (sd->completion_queue) { |
| 2142 | struct sk_buff *clist; |
| 2143 | |
| 2144 | local_irq_disable(); |
| 2145 | clist = sd->completion_queue; |
| 2146 | sd->completion_queue = NULL; |
| 2147 | local_irq_enable(); |
| 2148 | |
| 2149 | while (clist) { |
| 2150 | struct sk_buff *skb = clist; |
| 2151 | clist = clist->next; |
| 2152 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 2153 | WARN_ON(atomic_read(&skb->users)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | __kfree_skb(skb); |
| 2155 | } |
| 2156 | } |
| 2157 | |
| 2158 | if (sd->output_queue) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2159 | struct Qdisc *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | |
| 2161 | local_irq_disable(); |
| 2162 | head = sd->output_queue; |
| 2163 | sd->output_queue = NULL; |
| 2164 | local_irq_enable(); |
| 2165 | |
| 2166 | while (head) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2167 | struct Qdisc *q = head; |
| 2168 | spinlock_t *root_lock; |
| 2169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | head = head->next_sched; |
| 2171 | |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 2172 | root_lock = qdisc_lock(q); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2173 | if (spin_trylock(root_lock)) { |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 2174 | smp_mb__before_clear_bit(); |
| 2175 | clear_bit(__QDISC_STATE_SCHED, |
| 2176 | &q->state); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2177 | qdisc_run(q); |
| 2178 | spin_unlock(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | } else { |
David S. Miller | 195648b | 2008-08-19 04:00:36 -0700 | [diff] [blame] | 2180 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
Jarek Poplawski | e8a83e1 | 2008-09-07 18:41:21 -0700 | [diff] [blame] | 2181 | &q->state)) { |
David S. Miller | 195648b | 2008-08-19 04:00:36 -0700 | [diff] [blame] | 2182 | __netif_reschedule(q); |
Jarek Poplawski | e8a83e1 | 2008-09-07 18:41:21 -0700 | [diff] [blame] | 2183 | } else { |
| 2184 | smp_mb__before_clear_bit(); |
| 2185 | clear_bit(__QDISC_STATE_SCHED, |
| 2186 | &q->state); |
| 2187 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2188 | } |
| 2189 | } |
| 2190 | } |
| 2191 | } |
| 2192 | |
Stephen Hemminger | 6f05f62 | 2007-03-08 20:46:03 -0800 | [diff] [blame] | 2193 | static inline int deliver_skb(struct sk_buff *skb, |
| 2194 | struct packet_type *pt_prev, |
| 2195 | struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | { |
| 2197 | atomic_inc(&skb->users); |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2198 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2199 | } |
| 2200 | |
| 2201 | #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE) |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 2202 | |
| 2203 | #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE) |
| 2204 | /* This hook is defined here for ATM LANE */ |
| 2205 | int (*br_fdb_test_addr_hook)(struct net_device *dev, |
| 2206 | unsigned char *addr) __read_mostly; |
Stephen Hemminger | 4fb019a | 2009-09-11 11:50:08 -0700 | [diff] [blame] | 2207 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 2208 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2210 | /* |
| 2211 | * If bridge module is loaded call bridging hook. |
| 2212 | * returns NULL if packet was consumed. |
| 2213 | */ |
| 2214 | struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p, |
| 2215 | struct sk_buff *skb) __read_mostly; |
Stephen Hemminger | 4fb019a | 2009-09-11 11:50:08 -0700 | [diff] [blame] | 2216 | EXPORT_SYMBOL_GPL(br_handle_frame_hook); |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 2217 | |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2218 | static inline struct sk_buff *handle_bridge(struct sk_buff *skb, |
| 2219 | struct packet_type **pt_prev, int *ret, |
| 2220 | struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | { |
| 2222 | struct net_bridge_port *port; |
| 2223 | |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2224 | if (skb->pkt_type == PACKET_LOOPBACK || |
| 2225 | (port = rcu_dereference(skb->dev->br_port)) == NULL) |
| 2226 | return skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | |
| 2228 | if (*pt_prev) { |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2229 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | *pt_prev = NULL; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2231 | } |
| 2232 | |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2233 | return br_handle_frame_hook(port, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | } |
| 2235 | #else |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2236 | #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | #endif |
| 2238 | |
Patrick McHardy | b863ceb | 2007-07-14 18:55:06 -0700 | [diff] [blame] | 2239 | #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE) |
| 2240 | struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly; |
| 2241 | EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook); |
| 2242 | |
| 2243 | static inline struct sk_buff *handle_macvlan(struct sk_buff *skb, |
| 2244 | struct packet_type **pt_prev, |
| 2245 | int *ret, |
| 2246 | struct net_device *orig_dev) |
| 2247 | { |
| 2248 | if (skb->dev->macvlan_port == NULL) |
| 2249 | return skb; |
| 2250 | |
| 2251 | if (*pt_prev) { |
| 2252 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
| 2253 | *pt_prev = NULL; |
| 2254 | } |
| 2255 | return macvlan_handle_frame_hook(skb); |
| 2256 | } |
| 2257 | #else |
| 2258 | #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb) |
| 2259 | #endif |
| 2260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | #ifdef CONFIG_NET_CLS_ACT |
| 2262 | /* TODO: Maybe we should just force sch_ingress to be compiled in |
| 2263 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions |
| 2264 | * a compare and 2 stores extra right now if we dont have it on |
| 2265 | * but have CONFIG_NET_CLS_ACT |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2266 | * NOTE: This doesnt stop any functionality; if you dont have |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | * the ingress scheduler, you just cant add policies on ingress. |
| 2268 | * |
| 2269 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2270 | static int ing_filter(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | struct net_device *dev = skb->dev; |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2273 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
David S. Miller | 555353c | 2008-07-08 17:33:13 -0700 | [diff] [blame] | 2274 | struct netdev_queue *rxq; |
| 2275 | int result = TC_ACT_OK; |
| 2276 | struct Qdisc *q; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2277 | |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2278 | if (MAX_RED_LOOP < ttl++) { |
| 2279 | printk(KERN_WARNING |
| 2280 | "Redir loop detected Dropping packet (%d->%d)\n", |
| 2281 | skb->iif, dev->ifindex); |
| 2282 | return TC_ACT_SHOT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | } |
| 2284 | |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2285 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
| 2286 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); |
| 2287 | |
David S. Miller | 555353c | 2008-07-08 17:33:13 -0700 | [diff] [blame] | 2288 | rxq = &dev->rx_queue; |
| 2289 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 2290 | q = rxq->qdisc; |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 2291 | if (q != &noop_qdisc) { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 2292 | spin_lock(qdisc_lock(q)); |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 2293 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
| 2294 | result = qdisc_enqueue_root(skb, q); |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 2295 | spin_unlock(qdisc_lock(q)); |
| 2296 | } |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | return result; |
| 2299 | } |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2300 | |
| 2301 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
| 2302 | struct packet_type **pt_prev, |
| 2303 | int *ret, struct net_device *orig_dev) |
| 2304 | { |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 2305 | if (skb->dev->rx_queue.qdisc == &noop_qdisc) |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2306 | goto out; |
| 2307 | |
| 2308 | if (*pt_prev) { |
| 2309 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
| 2310 | *pt_prev = NULL; |
| 2311 | } else { |
| 2312 | /* Huh? Why does turning on AF_PACKET affect this? */ |
| 2313 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); |
| 2314 | } |
| 2315 | |
| 2316 | switch (ing_filter(skb)) { |
| 2317 | case TC_ACT_SHOT: |
| 2318 | case TC_ACT_STOLEN: |
| 2319 | kfree_skb(skb); |
| 2320 | return NULL; |
| 2321 | } |
| 2322 | |
| 2323 | out: |
| 2324 | skb->tc_verd = 0; |
| 2325 | return skb; |
| 2326 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | #endif |
| 2328 | |
Patrick McHardy | bc1d041 | 2008-07-14 22:49:30 -0700 | [diff] [blame] | 2329 | /* |
| 2330 | * netif_nit_deliver - deliver received packets to network taps |
| 2331 | * @skb: buffer |
| 2332 | * |
| 2333 | * This function is used to deliver incoming packets to network |
| 2334 | * taps. It should be used when the normal netif_receive_skb path |
| 2335 | * is bypassed, for example because of VLAN acceleration. |
| 2336 | */ |
| 2337 | void netif_nit_deliver(struct sk_buff *skb) |
| 2338 | { |
| 2339 | struct packet_type *ptype; |
| 2340 | |
| 2341 | if (list_empty(&ptype_all)) |
| 2342 | return; |
| 2343 | |
| 2344 | skb_reset_network_header(skb); |
| 2345 | skb_reset_transport_header(skb); |
| 2346 | skb->mac_len = skb->network_header - skb->mac_header; |
| 2347 | |
| 2348 | rcu_read_lock(); |
| 2349 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
| 2350 | if (!ptype->dev || ptype->dev == skb->dev) |
| 2351 | deliver_skb(skb, ptype, skb->dev); |
| 2352 | } |
| 2353 | rcu_read_unlock(); |
| 2354 | } |
| 2355 | |
Stephen Hemminger | 3b582cc | 2007-11-01 02:21:47 -0700 | [diff] [blame] | 2356 | /** |
| 2357 | * netif_receive_skb - process receive buffer from network |
| 2358 | * @skb: buffer to process |
| 2359 | * |
| 2360 | * netif_receive_skb() is the main receive data processing function. |
| 2361 | * It always succeeds. The buffer may be dropped during processing |
| 2362 | * for congestion control or by the protocol layers. |
| 2363 | * |
| 2364 | * This function may only be called from softirq context and interrupts |
| 2365 | * should be enabled. |
| 2366 | * |
| 2367 | * Return values (usually ignored): |
| 2368 | * NET_RX_SUCCESS: no congestion |
| 2369 | * NET_RX_DROP: packet was dropped |
| 2370 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | int netif_receive_skb(struct sk_buff *skb) |
| 2372 | { |
| 2373 | struct packet_type *ptype, *pt_prev; |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2374 | struct net_device *orig_dev; |
Joe Eykholt | 0d7a368 | 2008-07-02 18:22:01 -0700 | [diff] [blame] | 2375 | struct net_device *null_or_orig; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2376 | int ret = NET_RX_DROP; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 2377 | __be16 type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2378 | |
Eric Dumazet | 81bbb3d | 2009-09-30 16:42:42 -0700 | [diff] [blame] | 2379 | if (!skb->tstamp.tv64) |
| 2380 | net_timestamp(skb); |
| 2381 | |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 2382 | if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb)) |
Patrick McHardy | 9b22ea5 | 2008-11-04 14:49:57 -0800 | [diff] [blame] | 2383 | return NET_RX_SUCCESS; |
| 2384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2385 | /* if we've gotten here through NAPI, check netpoll */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2386 | if (netpoll_receive_skb(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2387 | return NET_RX_DROP; |
| 2388 | |
Patrick McHardy | c01003c | 2007-03-29 11:46:52 -0700 | [diff] [blame] | 2389 | if (!skb->iif) |
| 2390 | skb->iif = skb->dev->ifindex; |
David S. Miller | 86e65da | 2005-08-09 19:36:29 -0700 | [diff] [blame] | 2391 | |
Joe Eykholt | 0d7a368 | 2008-07-02 18:22:01 -0700 | [diff] [blame] | 2392 | null_or_orig = NULL; |
Joe Eykholt | cc9bd5c | 2008-07-02 18:22:00 -0700 | [diff] [blame] | 2393 | orig_dev = skb->dev; |
| 2394 | if (orig_dev->master) { |
Joe Eykholt | 0d7a368 | 2008-07-02 18:22:01 -0700 | [diff] [blame] | 2395 | if (skb_bond_should_drop(skb)) |
| 2396 | null_or_orig = orig_dev; /* deliver only exact match */ |
| 2397 | else |
| 2398 | skb->dev = orig_dev->master; |
Joe Eykholt | cc9bd5c | 2008-07-02 18:22:00 -0700 | [diff] [blame] | 2399 | } |
Jay Vosburgh | 8f903c7 | 2006-02-21 16:36:44 -0800 | [diff] [blame] | 2400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2401 | __get_cpu_var(netdev_rx_stat).total++; |
| 2402 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 2403 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 2404 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 2405 | skb->mac_len = skb->network_header - skb->mac_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | |
| 2407 | pt_prev = NULL; |
| 2408 | |
| 2409 | rcu_read_lock(); |
| 2410 | |
| 2411 | #ifdef CONFIG_NET_CLS_ACT |
| 2412 | if (skb->tc_verd & TC_NCLS) { |
| 2413 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); |
| 2414 | goto ncls; |
| 2415 | } |
| 2416 | #endif |
| 2417 | |
| 2418 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
Joe Eykholt | f982307 | 2008-07-02 18:22:02 -0700 | [diff] [blame] | 2419 | if (ptype->dev == null_or_orig || ptype->dev == skb->dev || |
| 2420 | ptype->dev == orig_dev) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2421 | if (pt_prev) |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2422 | ret = deliver_skb(skb, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2423 | pt_prev = ptype; |
| 2424 | } |
| 2425 | } |
| 2426 | |
| 2427 | #ifdef CONFIG_NET_CLS_ACT |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2428 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
| 2429 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | ncls: |
| 2432 | #endif |
| 2433 | |
Stephen Hemminger | 6229e36 | 2007-03-21 13:38:47 -0700 | [diff] [blame] | 2434 | skb = handle_bridge(skb, &pt_prev, &ret, orig_dev); |
| 2435 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | goto out; |
Patrick McHardy | b863ceb | 2007-07-14 18:55:06 -0700 | [diff] [blame] | 2437 | skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev); |
| 2438 | if (!skb) |
| 2439 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2440 | |
| 2441 | type = skb->protocol; |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 2442 | list_for_each_entry_rcu(ptype, |
| 2443 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | if (ptype->type == type && |
Joe Eykholt | f982307 | 2008-07-02 18:22:02 -0700 | [diff] [blame] | 2445 | (ptype->dev == null_or_orig || ptype->dev == skb->dev || |
| 2446 | ptype->dev == orig_dev)) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2447 | if (pt_prev) |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2448 | ret = deliver_skb(skb, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2449 | pt_prev = ptype; |
| 2450 | } |
| 2451 | } |
| 2452 | |
| 2453 | if (pt_prev) { |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2454 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2455 | } else { |
| 2456 | kfree_skb(skb); |
| 2457 | /* Jamal, now you will not able to escape explaining |
| 2458 | * me how you were going to use this. :-) |
| 2459 | */ |
| 2460 | ret = NET_RX_DROP; |
| 2461 | } |
| 2462 | |
| 2463 | out: |
| 2464 | rcu_read_unlock(); |
| 2465 | return ret; |
| 2466 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2467 | EXPORT_SYMBOL(netif_receive_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2469 | /* Network device is going away, flush any packets still pending */ |
| 2470 | static void flush_backlog(void *arg) |
| 2471 | { |
| 2472 | struct net_device *dev = arg; |
| 2473 | struct softnet_data *queue = &__get_cpu_var(softnet_data); |
| 2474 | struct sk_buff *skb, *tmp; |
| 2475 | |
| 2476 | skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp) |
| 2477 | if (skb->dev == dev) { |
| 2478 | __skb_unlink(skb, &queue->input_pkt_queue); |
| 2479 | kfree_skb(skb); |
| 2480 | } |
| 2481 | } |
| 2482 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2483 | static int napi_gro_complete(struct sk_buff *skb) |
| 2484 | { |
| 2485 | struct packet_type *ptype; |
| 2486 | __be16 type = skb->protocol; |
| 2487 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; |
| 2488 | int err = -ENOENT; |
| 2489 | |
Herbert Xu | fc59f9a | 2009-04-14 15:11:06 -0700 | [diff] [blame] | 2490 | if (NAPI_GRO_CB(skb)->count == 1) { |
| 2491 | skb_shinfo(skb)->gso_size = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2492 | goto out; |
Herbert Xu | fc59f9a | 2009-04-14 15:11:06 -0700 | [diff] [blame] | 2493 | } |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2494 | |
| 2495 | rcu_read_lock(); |
| 2496 | list_for_each_entry_rcu(ptype, head, list) { |
| 2497 | if (ptype->type != type || ptype->dev || !ptype->gro_complete) |
| 2498 | continue; |
| 2499 | |
| 2500 | err = ptype->gro_complete(skb); |
| 2501 | break; |
| 2502 | } |
| 2503 | rcu_read_unlock(); |
| 2504 | |
| 2505 | if (err) { |
| 2506 | WARN_ON(&ptype->list == head); |
| 2507 | kfree_skb(skb); |
| 2508 | return NET_RX_SUCCESS; |
| 2509 | } |
| 2510 | |
| 2511 | out: |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2512 | return netif_receive_skb(skb); |
| 2513 | } |
| 2514 | |
| 2515 | void napi_gro_flush(struct napi_struct *napi) |
| 2516 | { |
| 2517 | struct sk_buff *skb, *next; |
| 2518 | |
| 2519 | for (skb = napi->gro_list; skb; skb = next) { |
| 2520 | next = skb->next; |
| 2521 | skb->next = NULL; |
| 2522 | napi_gro_complete(skb); |
| 2523 | } |
| 2524 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 2525 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2526 | napi->gro_list = NULL; |
| 2527 | } |
| 2528 | EXPORT_SYMBOL(napi_gro_flush); |
| 2529 | |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 2530 | 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] | 2531 | { |
| 2532 | struct sk_buff **pp = NULL; |
| 2533 | struct packet_type *ptype; |
| 2534 | __be16 type = skb->protocol; |
| 2535 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 2536 | int same_flow; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2537 | int mac_len; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 2538 | enum gro_result ret; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2539 | |
| 2540 | if (!(skb->dev->features & NETIF_F_GRO)) |
| 2541 | goto normal; |
| 2542 | |
David S. Miller | 4cf704f | 2009-06-09 00:18:51 -0700 | [diff] [blame] | 2543 | if (skb_is_gso(skb) || skb_has_frags(skb)) |
Herbert Xu | f17f5c9 | 2009-01-14 14:36:12 -0800 | [diff] [blame] | 2544 | goto normal; |
| 2545 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2546 | rcu_read_lock(); |
| 2547 | list_for_each_entry_rcu(ptype, head, list) { |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2548 | if (ptype->type != type || ptype->dev || !ptype->gro_receive) |
| 2549 | continue; |
| 2550 | |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 2551 | skb_set_network_header(skb, skb_gro_offset(skb)); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2552 | mac_len = skb->network_header - skb->mac_header; |
| 2553 | skb->mac_len = mac_len; |
| 2554 | NAPI_GRO_CB(skb)->same_flow = 0; |
| 2555 | NAPI_GRO_CB(skb)->flush = 0; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2556 | NAPI_GRO_CB(skb)->free = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2557 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2558 | pp = ptype->gro_receive(&napi->gro_list, skb); |
| 2559 | break; |
| 2560 | } |
| 2561 | rcu_read_unlock(); |
| 2562 | |
| 2563 | if (&ptype->list == head) |
| 2564 | goto normal; |
| 2565 | |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 2566 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2567 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 2568 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2569 | if (pp) { |
| 2570 | struct sk_buff *nskb = *pp; |
| 2571 | |
| 2572 | *pp = nskb->next; |
| 2573 | nskb->next = NULL; |
| 2574 | napi_gro_complete(nskb); |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 2575 | napi->gro_count--; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2576 | } |
| 2577 | |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 2578 | if (same_flow) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2579 | goto ok; |
| 2580 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 2581 | if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2582 | goto normal; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2583 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 2584 | napi->gro_count++; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2585 | NAPI_GRO_CB(skb)->count = 1; |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 2586 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2587 | skb->next = napi->gro_list; |
| 2588 | napi->gro_list = skb; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2589 | ret = GRO_HELD; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2590 | |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 2591 | pull: |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 2592 | if (skb_headlen(skb) < skb_gro_offset(skb)) { |
| 2593 | int grow = skb_gro_offset(skb) - skb_headlen(skb); |
| 2594 | |
| 2595 | BUG_ON(skb->end - skb->tail < grow); |
| 2596 | |
| 2597 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); |
| 2598 | |
| 2599 | skb->tail += grow; |
| 2600 | skb->data_len -= grow; |
| 2601 | |
| 2602 | skb_shinfo(skb)->frags[0].page_offset += grow; |
| 2603 | skb_shinfo(skb)->frags[0].size -= grow; |
| 2604 | |
| 2605 | if (unlikely(!skb_shinfo(skb)->frags[0].size)) { |
| 2606 | put_page(skb_shinfo(skb)->frags[0].page); |
| 2607 | memmove(skb_shinfo(skb)->frags, |
| 2608 | skb_shinfo(skb)->frags + 1, |
| 2609 | --skb_shinfo(skb)->nr_frags); |
| 2610 | } |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 2611 | } |
| 2612 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2613 | ok: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2614 | return ret; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2615 | |
| 2616 | normal: |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 2617 | ret = GRO_NORMAL; |
| 2618 | goto pull; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2619 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2620 | EXPORT_SYMBOL(dev_gro_receive); |
| 2621 | |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 2622 | static gro_result_t |
| 2623 | __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2624 | { |
| 2625 | struct sk_buff *p; |
| 2626 | |
Herbert Xu | d1c76af | 2009-03-16 10:50:02 -0700 | [diff] [blame] | 2627 | if (netpoll_rx_on(skb)) |
| 2628 | return GRO_NORMAL; |
| 2629 | |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2630 | for (p = napi->gro_list; p; p = p->next) { |
Stephen Hemminger | f2bde73 | 2009-04-01 11:20:20 +0000 | [diff] [blame] | 2631 | NAPI_GRO_CB(p)->same_flow = (p->dev == skb->dev) |
| 2632 | && !compare_ether_header(skb_mac_header(p), |
| 2633 | skb_gro_mac_header(skb)); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2634 | NAPI_GRO_CB(p)->flush = 0; |
| 2635 | } |
| 2636 | |
| 2637 | return dev_gro_receive(napi, skb); |
| 2638 | } |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2639 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 2640 | 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] | 2641 | { |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2642 | switch (ret) { |
| 2643 | case GRO_NORMAL: |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 2644 | if (netif_receive_skb(skb)) |
| 2645 | ret = GRO_DROP; |
| 2646 | break; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2647 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2648 | case GRO_DROP: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2649 | case GRO_MERGED_FREE: |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2650 | kfree_skb(skb); |
| 2651 | break; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 2652 | |
| 2653 | case GRO_HELD: |
| 2654 | case GRO_MERGED: |
| 2655 | break; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2656 | } |
| 2657 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 2658 | return ret; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2659 | } |
| 2660 | EXPORT_SYMBOL(napi_skb_finish); |
| 2661 | |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 2662 | void skb_gro_reset_offset(struct sk_buff *skb) |
| 2663 | { |
| 2664 | NAPI_GRO_CB(skb)->data_offset = 0; |
| 2665 | NAPI_GRO_CB(skb)->frag0 = NULL; |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 2666 | NAPI_GRO_CB(skb)->frag0_len = 0; |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 2667 | |
Herbert Xu | 78d3fd0 | 2009-05-26 18:50:23 +0000 | [diff] [blame] | 2668 | if (skb->mac_header == skb->tail && |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 2669 | !PageHighMem(skb_shinfo(skb)->frags[0].page)) { |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 2670 | NAPI_GRO_CB(skb)->frag0 = |
| 2671 | page_address(skb_shinfo(skb)->frags[0].page) + |
| 2672 | skb_shinfo(skb)->frags[0].page_offset; |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 2673 | NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size; |
| 2674 | } |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 2675 | } |
| 2676 | EXPORT_SYMBOL(skb_gro_reset_offset); |
| 2677 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 2678 | 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] | 2679 | { |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 2680 | skb_gro_reset_offset(skb); |
| 2681 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2682 | return napi_skb_finish(__napi_gro_receive(napi, skb), skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2683 | } |
| 2684 | EXPORT_SYMBOL(napi_gro_receive); |
| 2685 | |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2686 | void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
| 2687 | { |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2688 | __skb_pull(skb, skb_headlen(skb)); |
| 2689 | skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb)); |
| 2690 | |
| 2691 | napi->skb = skb; |
| 2692 | } |
| 2693 | EXPORT_SYMBOL(napi_reuse_skb); |
| 2694 | |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 2695 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2696 | { |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2697 | struct sk_buff *skb = napi->skb; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2698 | |
| 2699 | if (!skb) { |
Eric Dumazet | 89d71a6 | 2009-10-13 05:34:20 +0000 | [diff] [blame] | 2700 | skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD); |
| 2701 | if (skb) |
| 2702 | napi->skb = skb; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2703 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2704 | return skb; |
| 2705 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 2706 | EXPORT_SYMBOL(napi_get_frags); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2707 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 2708 | gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, |
| 2709 | gro_result_t ret) |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2710 | { |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2711 | switch (ret) { |
| 2712 | case GRO_NORMAL: |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 2713 | case GRO_HELD: |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 2714 | skb->protocol = eth_type_trans(skb, napi->dev); |
| 2715 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 2716 | if (ret == GRO_HELD) |
| 2717 | skb_gro_pull(skb, -ETH_HLEN); |
| 2718 | else if (netif_receive_skb(skb)) |
| 2719 | ret = GRO_DROP; |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 2720 | break; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2721 | |
| 2722 | case GRO_DROP: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2723 | case GRO_MERGED_FREE: |
| 2724 | napi_reuse_skb(napi, skb); |
| 2725 | break; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 2726 | |
| 2727 | case GRO_MERGED: |
| 2728 | break; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2729 | } |
| 2730 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 2731 | return ret; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2732 | } |
| 2733 | EXPORT_SYMBOL(napi_frags_finish); |
| 2734 | |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 2735 | struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2736 | { |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 2737 | struct sk_buff *skb = napi->skb; |
| 2738 | struct ethhdr *eth; |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 2739 | unsigned int hlen; |
| 2740 | unsigned int off; |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 2741 | |
| 2742 | napi->skb = NULL; |
| 2743 | |
| 2744 | skb_reset_mac_header(skb); |
| 2745 | skb_gro_reset_offset(skb); |
| 2746 | |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 2747 | off = skb_gro_offset(skb); |
| 2748 | hlen = off + sizeof(*eth); |
| 2749 | eth = skb_gro_header_fast(skb, off); |
| 2750 | if (skb_gro_header_hard(skb, hlen)) { |
| 2751 | eth = skb_gro_header_slow(skb, hlen, off); |
| 2752 | if (unlikely(!eth)) { |
| 2753 | napi_reuse_skb(napi, skb); |
| 2754 | skb = NULL; |
| 2755 | goto out; |
| 2756 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 2757 | } |
| 2758 | |
| 2759 | skb_gro_pull(skb, sizeof(*eth)); |
| 2760 | |
| 2761 | /* |
| 2762 | * This works because the only protocols we care about don't require |
| 2763 | * special handling. We'll fix it up properly at the end. |
| 2764 | */ |
| 2765 | skb->protocol = eth->h_proto; |
| 2766 | |
| 2767 | out: |
| 2768 | return skb; |
| 2769 | } |
| 2770 | EXPORT_SYMBOL(napi_frags_skb); |
| 2771 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 2772 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 2773 | { |
| 2774 | struct sk_buff *skb = napi_frags_skb(napi); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2775 | |
| 2776 | if (!skb) |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 2777 | return GRO_DROP; |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 2778 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 2779 | return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb)); |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2780 | } |
| 2781 | EXPORT_SYMBOL(napi_gro_frags); |
| 2782 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2783 | static int process_backlog(struct napi_struct *napi, int quota) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2784 | { |
| 2785 | int work = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2786 | struct softnet_data *queue = &__get_cpu_var(softnet_data); |
| 2787 | unsigned long start_time = jiffies; |
| 2788 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2789 | napi->weight = weight_p; |
| 2790 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2791 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2792 | |
| 2793 | local_irq_disable(); |
| 2794 | skb = __skb_dequeue(&queue->input_pkt_queue); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2795 | if (!skb) { |
Herbert Xu | 8f1ead2 | 2009-03-26 00:59:10 -0700 | [diff] [blame] | 2796 | __napi_complete(napi); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2797 | local_irq_enable(); |
Herbert Xu | 8f1ead2 | 2009-03-26 00:59:10 -0700 | [diff] [blame] | 2798 | break; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2799 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2800 | local_irq_enable(); |
| 2801 | |
Herbert Xu | 8f1ead2 | 2009-03-26 00:59:10 -0700 | [diff] [blame] | 2802 | netif_receive_skb(skb); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2803 | } while (++work < quota && jiffies == start_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2804 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2805 | return work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2806 | } |
| 2807 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2808 | /** |
| 2809 | * __napi_schedule - schedule for receive |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 2810 | * @n: entry to schedule |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2811 | * |
| 2812 | * The entry's receive function will be scheduled to run |
| 2813 | */ |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 2814 | void __napi_schedule(struct napi_struct *n) |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2815 | { |
| 2816 | unsigned long flags; |
| 2817 | |
| 2818 | local_irq_save(flags); |
| 2819 | list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list); |
| 2820 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 2821 | local_irq_restore(flags); |
| 2822 | } |
| 2823 | EXPORT_SYMBOL(__napi_schedule); |
| 2824 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2825 | void __napi_complete(struct napi_struct *n) |
| 2826 | { |
| 2827 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); |
| 2828 | BUG_ON(n->gro_list); |
| 2829 | |
| 2830 | list_del(&n->poll_list); |
| 2831 | smp_mb__before_clear_bit(); |
| 2832 | clear_bit(NAPI_STATE_SCHED, &n->state); |
| 2833 | } |
| 2834 | EXPORT_SYMBOL(__napi_complete); |
| 2835 | |
| 2836 | void napi_complete(struct napi_struct *n) |
| 2837 | { |
| 2838 | unsigned long flags; |
| 2839 | |
| 2840 | /* |
| 2841 | * don't let napi dequeue from the cpu poll list |
| 2842 | * just in case its running on a different cpu |
| 2843 | */ |
| 2844 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) |
| 2845 | return; |
| 2846 | |
| 2847 | napi_gro_flush(n); |
| 2848 | local_irq_save(flags); |
| 2849 | __napi_complete(n); |
| 2850 | local_irq_restore(flags); |
| 2851 | } |
| 2852 | EXPORT_SYMBOL(napi_complete); |
| 2853 | |
| 2854 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
| 2855 | int (*poll)(struct napi_struct *, int), int weight) |
| 2856 | { |
| 2857 | INIT_LIST_HEAD(&napi->poll_list); |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 2858 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2859 | napi->gro_list = NULL; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2860 | napi->skb = NULL; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2861 | napi->poll = poll; |
| 2862 | napi->weight = weight; |
| 2863 | list_add(&napi->dev_list, &dev->napi_list); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2864 | napi->dev = dev; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 2865 | #ifdef CONFIG_NETPOLL |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2866 | spin_lock_init(&napi->poll_lock); |
| 2867 | napi->poll_owner = -1; |
| 2868 | #endif |
| 2869 | set_bit(NAPI_STATE_SCHED, &napi->state); |
| 2870 | } |
| 2871 | EXPORT_SYMBOL(netif_napi_add); |
| 2872 | |
| 2873 | void netif_napi_del(struct napi_struct *napi) |
| 2874 | { |
| 2875 | struct sk_buff *skb, *next; |
| 2876 | |
Peter P Waskiewicz Jr | d7b0663 | 2008-12-26 01:35:35 -0800 | [diff] [blame] | 2877 | list_del_init(&napi->dev_list); |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 2878 | napi_free_frags(napi); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2879 | |
| 2880 | for (skb = napi->gro_list; skb; skb = next) { |
| 2881 | next = skb->next; |
| 2882 | skb->next = NULL; |
| 2883 | kfree_skb(skb); |
| 2884 | } |
| 2885 | |
| 2886 | napi->gro_list = NULL; |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 2887 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2888 | } |
| 2889 | EXPORT_SYMBOL(netif_napi_del); |
| 2890 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2891 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2892 | static void net_rx_action(struct softirq_action *h) |
| 2893 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2894 | struct list_head *list = &__get_cpu_var(softnet_data).poll_list; |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 2895 | unsigned long time_limit = jiffies + 2; |
Stephen Hemminger | 51b0bde | 2005-06-23 20:14:40 -0700 | [diff] [blame] | 2896 | int budget = netdev_budget; |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 2897 | void *have; |
| 2898 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2899 | local_irq_disable(); |
| 2900 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2901 | while (!list_empty(list)) { |
| 2902 | struct napi_struct *n; |
| 2903 | int work, weight; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2904 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2905 | /* If softirq window is exhuasted then punt. |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 2906 | * Allow this to run for 2 jiffies since which will allow |
| 2907 | * an average latency of 1.5/HZ. |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2908 | */ |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 2909 | if (unlikely(budget <= 0 || time_after(jiffies, time_limit))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2910 | goto softnet_break; |
| 2911 | |
| 2912 | local_irq_enable(); |
| 2913 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2914 | /* Even though interrupts have been re-enabled, this |
| 2915 | * access is safe because interrupts can only add new |
| 2916 | * entries to the tail of this list, and only ->poll() |
| 2917 | * calls can remove this head entry from the list. |
| 2918 | */ |
| 2919 | n = list_entry(list->next, struct napi_struct, poll_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2920 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2921 | have = netpoll_poll_lock(n); |
| 2922 | |
| 2923 | weight = n->weight; |
| 2924 | |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 2925 | /* This NAPI_STATE_SCHED test is for avoiding a race |
| 2926 | * with netpoll's poll_napi(). Only the entity which |
| 2927 | * obtains the lock and sees NAPI_STATE_SCHED set will |
| 2928 | * actually make the ->poll() call. Therefore we avoid |
| 2929 | * accidently calling ->poll() when NAPI is not scheduled. |
| 2930 | */ |
| 2931 | work = 0; |
Neil Horman | 4ea7e38 | 2009-05-21 07:36:08 +0000 | [diff] [blame] | 2932 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 2933 | work = n->poll(n, weight); |
Neil Horman | 4ea7e38 | 2009-05-21 07:36:08 +0000 | [diff] [blame] | 2934 | trace_napi_poll(n); |
| 2935 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2936 | |
| 2937 | WARN_ON_ONCE(work > weight); |
| 2938 | |
| 2939 | budget -= work; |
| 2940 | |
| 2941 | local_irq_disable(); |
| 2942 | |
| 2943 | /* Drivers must not modify the NAPI state if they |
| 2944 | * consume the entire weight. In such cases this code |
| 2945 | * still "owns" the NAPI instance and therefore can |
| 2946 | * move the instance around on the list at-will. |
| 2947 | */ |
David S. Miller | fed17f3 | 2008-01-07 21:00:40 -0800 | [diff] [blame] | 2948 | if (unlikely(work == weight)) { |
Herbert Xu | ff780cd | 2009-06-26 19:27:04 -0700 | [diff] [blame] | 2949 | if (unlikely(napi_disable_pending(n))) { |
| 2950 | local_irq_enable(); |
| 2951 | napi_complete(n); |
| 2952 | local_irq_disable(); |
| 2953 | } else |
David S. Miller | fed17f3 | 2008-01-07 21:00:40 -0800 | [diff] [blame] | 2954 | list_move_tail(&n->poll_list, list); |
| 2955 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2956 | |
| 2957 | netpoll_poll_unlock(have); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2958 | } |
| 2959 | out: |
Shannon Nelson | 515e06c | 2007-06-23 23:09:23 -0700 | [diff] [blame] | 2960 | local_irq_enable(); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2961 | |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 2962 | #ifdef CONFIG_NET_DMA |
| 2963 | /* |
| 2964 | * There may not be any more sk_buffs coming right now, so push |
| 2965 | * any pending DMA copies to hardware |
| 2966 | */ |
Dan Williams | 2ba0562 | 2009-01-06 11:38:14 -0700 | [diff] [blame] | 2967 | dma_issue_pending_all(); |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 2968 | #endif |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2969 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2970 | return; |
| 2971 | |
| 2972 | softnet_break: |
| 2973 | __get_cpu_var(netdev_rx_stat).time_squeeze++; |
| 2974 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 2975 | goto out; |
| 2976 | } |
| 2977 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2978 | static gifconf_func_t *gifconf_list[NPROTO]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2979 | |
| 2980 | /** |
| 2981 | * register_gifconf - register a SIOCGIF handler |
| 2982 | * @family: Address family |
| 2983 | * @gifconf: Function handler |
| 2984 | * |
| 2985 | * Register protocol dependent address dumping routines. The handler |
| 2986 | * that is passed must not be freed or reused until it has been replaced |
| 2987 | * by another handler. |
| 2988 | */ |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2989 | int register_gifconf(unsigned int family, gifconf_func_t *gifconf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2990 | { |
| 2991 | if (family >= NPROTO) |
| 2992 | return -EINVAL; |
| 2993 | gifconf_list[family] = gifconf; |
| 2994 | return 0; |
| 2995 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2996 | EXPORT_SYMBOL(register_gifconf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2997 | |
| 2998 | |
| 2999 | /* |
| 3000 | * Map an interface index to its name (SIOCGIFNAME) |
| 3001 | */ |
| 3002 | |
| 3003 | /* |
| 3004 | * We need this ioctl for efficient implementation of the |
| 3005 | * if_indextoname() function required by the IPv6 API. Without |
| 3006 | * it, we would have to search all the interfaces to find a |
| 3007 | * match. --pb |
| 3008 | */ |
| 3009 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3010 | static int dev_ifname(struct net *net, struct ifreq __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3011 | { |
| 3012 | struct net_device *dev; |
| 3013 | struct ifreq ifr; |
| 3014 | |
| 3015 | /* |
| 3016 | * Fetch the caller's info block. |
| 3017 | */ |
| 3018 | |
| 3019 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) |
| 3020 | return -EFAULT; |
| 3021 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 3022 | rcu_read_lock(); |
| 3023 | dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3024 | if (!dev) { |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 3025 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3026 | return -ENODEV; |
| 3027 | } |
| 3028 | |
| 3029 | strcpy(ifr.ifr_name, dev->name); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 3030 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3031 | |
| 3032 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) |
| 3033 | return -EFAULT; |
| 3034 | return 0; |
| 3035 | } |
| 3036 | |
| 3037 | /* |
| 3038 | * Perform a SIOCGIFCONF call. This structure will change |
| 3039 | * size eventually, and there is nothing I can do about it. |
| 3040 | * Thus we will need a 'compatibility mode'. |
| 3041 | */ |
| 3042 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3043 | static int dev_ifconf(struct net *net, char __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3044 | { |
| 3045 | struct ifconf ifc; |
| 3046 | struct net_device *dev; |
| 3047 | char __user *pos; |
| 3048 | int len; |
| 3049 | int total; |
| 3050 | int i; |
| 3051 | |
| 3052 | /* |
| 3053 | * Fetch the caller's info block. |
| 3054 | */ |
| 3055 | |
| 3056 | if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) |
| 3057 | return -EFAULT; |
| 3058 | |
| 3059 | pos = ifc.ifc_buf; |
| 3060 | len = ifc.ifc_len; |
| 3061 | |
| 3062 | /* |
| 3063 | * Loop over the interfaces, and write an info block for each. |
| 3064 | */ |
| 3065 | |
| 3066 | total = 0; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3067 | for_each_netdev(net, dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3068 | for (i = 0; i < NPROTO; i++) { |
| 3069 | if (gifconf_list[i]) { |
| 3070 | int done; |
| 3071 | if (!pos) |
| 3072 | done = gifconf_list[i](dev, NULL, 0); |
| 3073 | else |
| 3074 | done = gifconf_list[i](dev, pos + total, |
| 3075 | len - total); |
| 3076 | if (done < 0) |
| 3077 | return -EFAULT; |
| 3078 | total += done; |
| 3079 | } |
| 3080 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3081 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3082 | |
| 3083 | /* |
| 3084 | * All done. Write the updated control block back to the caller. |
| 3085 | */ |
| 3086 | ifc.ifc_len = total; |
| 3087 | |
| 3088 | /* |
| 3089 | * Both BSD and Solaris return 0 here, so we do too. |
| 3090 | */ |
| 3091 | return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; |
| 3092 | } |
| 3093 | |
| 3094 | #ifdef CONFIG_PROC_FS |
| 3095 | /* |
| 3096 | * This is invoked by the /proc filesystem handler to display a device |
| 3097 | * in detail. |
| 3098 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3099 | void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3100 | __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3101 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3102 | struct net *net = seq_file_net(seq); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 3103 | loff_t off; |
| 3104 | struct net_device *dev; |
| 3105 | |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3106 | rcu_read_lock(); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 3107 | if (!*pos) |
| 3108 | return SEQ_START_TOKEN; |
| 3109 | |
| 3110 | off = 1; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3111 | for_each_netdev_rcu(net, dev) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 3112 | if (off++ == *pos) |
| 3113 | return dev; |
| 3114 | |
| 3115 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3116 | } |
| 3117 | |
| 3118 | void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 3119 | { |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3120 | struct net_device *dev = (v == SEQ_START_TOKEN) ? |
| 3121 | first_net_device(seq_file_net(seq)) : |
| 3122 | next_net_device((struct net_device *)v); |
| 3123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3124 | ++*pos; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3125 | return rcu_dereference(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3126 | } |
| 3127 | |
| 3128 | void dev_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3129 | __releases(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3130 | { |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3131 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | } |
| 3133 | |
| 3134 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) |
| 3135 | { |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 3136 | const struct net_device_stats *stats = dev_get_stats(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3137 | |
Rusty Russell | 5a1b589 | 2007-04-28 21:04:03 -0700 | [diff] [blame] | 3138 | seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu " |
| 3139 | "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n", |
| 3140 | dev->name, stats->rx_bytes, stats->rx_packets, |
| 3141 | stats->rx_errors, |
| 3142 | stats->rx_dropped + stats->rx_missed_errors, |
| 3143 | stats->rx_fifo_errors, |
| 3144 | stats->rx_length_errors + stats->rx_over_errors + |
| 3145 | stats->rx_crc_errors + stats->rx_frame_errors, |
| 3146 | stats->rx_compressed, stats->multicast, |
| 3147 | stats->tx_bytes, stats->tx_packets, |
| 3148 | stats->tx_errors, stats->tx_dropped, |
| 3149 | stats->tx_fifo_errors, stats->collisions, |
| 3150 | stats->tx_carrier_errors + |
| 3151 | stats->tx_aborted_errors + |
| 3152 | stats->tx_window_errors + |
| 3153 | stats->tx_heartbeat_errors, |
| 3154 | stats->tx_compressed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3155 | } |
| 3156 | |
| 3157 | /* |
| 3158 | * Called from the PROCfs module. This now uses the new arbitrary sized |
| 3159 | * /proc/net interface to create /proc/net/dev |
| 3160 | */ |
| 3161 | static int dev_seq_show(struct seq_file *seq, void *v) |
| 3162 | { |
| 3163 | if (v == SEQ_START_TOKEN) |
| 3164 | seq_puts(seq, "Inter-| Receive " |
| 3165 | " | Transmit\n" |
| 3166 | " face |bytes packets errs drop fifo frame " |
| 3167 | "compressed multicast|bytes packets errs " |
| 3168 | "drop fifo colls carrier compressed\n"); |
| 3169 | else |
| 3170 | dev_seq_printf_stats(seq, v); |
| 3171 | return 0; |
| 3172 | } |
| 3173 | |
| 3174 | static struct netif_rx_stats *softnet_get_online(loff_t *pos) |
| 3175 | { |
| 3176 | struct netif_rx_stats *rc = NULL; |
| 3177 | |
Mike Travis | 0c0b0ac | 2008-05-02 16:43:08 -0700 | [diff] [blame] | 3178 | while (*pos < nr_cpu_ids) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3179 | if (cpu_online(*pos)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3180 | rc = &per_cpu(netdev_rx_stat, *pos); |
| 3181 | break; |
| 3182 | } else |
| 3183 | ++*pos; |
| 3184 | return rc; |
| 3185 | } |
| 3186 | |
| 3187 | static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) |
| 3188 | { |
| 3189 | return softnet_get_online(pos); |
| 3190 | } |
| 3191 | |
| 3192 | static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 3193 | { |
| 3194 | ++*pos; |
| 3195 | return softnet_get_online(pos); |
| 3196 | } |
| 3197 | |
| 3198 | static void softnet_seq_stop(struct seq_file *seq, void *v) |
| 3199 | { |
| 3200 | } |
| 3201 | |
| 3202 | static int softnet_seq_show(struct seq_file *seq, void *v) |
| 3203 | { |
| 3204 | struct netif_rx_stats *s = v; |
| 3205 | |
| 3206 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n", |
Stephen Hemminger | 31aa02c | 2005-06-23 20:12:48 -0700 | [diff] [blame] | 3207 | s->total, s->dropped, s->time_squeeze, 0, |
Stephen Hemminger | c1ebcdb | 2005-06-23 20:08:59 -0700 | [diff] [blame] | 3208 | 0, 0, 0, 0, /* was fastroute */ |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3209 | s->cpu_collision); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3210 | return 0; |
| 3211 | } |
| 3212 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 3213 | static const struct seq_operations dev_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3214 | .start = dev_seq_start, |
| 3215 | .next = dev_seq_next, |
| 3216 | .stop = dev_seq_stop, |
| 3217 | .show = dev_seq_show, |
| 3218 | }; |
| 3219 | |
| 3220 | static int dev_seq_open(struct inode *inode, struct file *file) |
| 3221 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3222 | return seq_open_net(inode, file, &dev_seq_ops, |
| 3223 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3224 | } |
| 3225 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 3226 | static const struct file_operations dev_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3227 | .owner = THIS_MODULE, |
| 3228 | .open = dev_seq_open, |
| 3229 | .read = seq_read, |
| 3230 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3231 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3232 | }; |
| 3233 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 3234 | static const struct seq_operations softnet_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3235 | .start = softnet_seq_start, |
| 3236 | .next = softnet_seq_next, |
| 3237 | .stop = softnet_seq_stop, |
| 3238 | .show = softnet_seq_show, |
| 3239 | }; |
| 3240 | |
| 3241 | static int softnet_seq_open(struct inode *inode, struct file *file) |
| 3242 | { |
| 3243 | return seq_open(file, &softnet_seq_ops); |
| 3244 | } |
| 3245 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 3246 | static const struct file_operations softnet_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3247 | .owner = THIS_MODULE, |
| 3248 | .open = softnet_seq_open, |
| 3249 | .read = seq_read, |
| 3250 | .llseek = seq_lseek, |
| 3251 | .release = seq_release, |
| 3252 | }; |
| 3253 | |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3254 | static void *ptype_get_idx(loff_t pos) |
| 3255 | { |
| 3256 | struct packet_type *pt = NULL; |
| 3257 | loff_t i = 0; |
| 3258 | int t; |
| 3259 | |
| 3260 | list_for_each_entry_rcu(pt, &ptype_all, list) { |
| 3261 | if (i == pos) |
| 3262 | return pt; |
| 3263 | ++i; |
| 3264 | } |
| 3265 | |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3266 | for (t = 0; t < PTYPE_HASH_SIZE; t++) { |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3267 | list_for_each_entry_rcu(pt, &ptype_base[t], list) { |
| 3268 | if (i == pos) |
| 3269 | return pt; |
| 3270 | ++i; |
| 3271 | } |
| 3272 | } |
| 3273 | return NULL; |
| 3274 | } |
| 3275 | |
| 3276 | static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) |
Stephen Hemminger | 72348a4 | 2008-01-21 02:27:29 -0800 | [diff] [blame] | 3277 | __acquires(RCU) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3278 | { |
| 3279 | rcu_read_lock(); |
| 3280 | return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; |
| 3281 | } |
| 3282 | |
| 3283 | static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 3284 | { |
| 3285 | struct packet_type *pt; |
| 3286 | struct list_head *nxt; |
| 3287 | int hash; |
| 3288 | |
| 3289 | ++*pos; |
| 3290 | if (v == SEQ_START_TOKEN) |
| 3291 | return ptype_get_idx(0); |
| 3292 | |
| 3293 | pt = v; |
| 3294 | nxt = pt->list.next; |
| 3295 | if (pt->type == htons(ETH_P_ALL)) { |
| 3296 | if (nxt != &ptype_all) |
| 3297 | goto found; |
| 3298 | hash = 0; |
| 3299 | nxt = ptype_base[0].next; |
| 3300 | } else |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3301 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3302 | |
| 3303 | while (nxt == &ptype_base[hash]) { |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3304 | if (++hash >= PTYPE_HASH_SIZE) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3305 | return NULL; |
| 3306 | nxt = ptype_base[hash].next; |
| 3307 | } |
| 3308 | found: |
| 3309 | return list_entry(nxt, struct packet_type, list); |
| 3310 | } |
| 3311 | |
| 3312 | static void ptype_seq_stop(struct seq_file *seq, void *v) |
Stephen Hemminger | 72348a4 | 2008-01-21 02:27:29 -0800 | [diff] [blame] | 3313 | __releases(RCU) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3314 | { |
| 3315 | rcu_read_unlock(); |
| 3316 | } |
| 3317 | |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3318 | static int ptype_seq_show(struct seq_file *seq, void *v) |
| 3319 | { |
| 3320 | struct packet_type *pt = v; |
| 3321 | |
| 3322 | if (v == SEQ_START_TOKEN) |
| 3323 | seq_puts(seq, "Type Device Function\n"); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 3324 | 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] | 3325 | if (pt->type == htons(ETH_P_ALL)) |
| 3326 | seq_puts(seq, "ALL "); |
| 3327 | else |
| 3328 | seq_printf(seq, "%04x", ntohs(pt->type)); |
| 3329 | |
Alexey Dobriyan | 908cd2d | 2008-11-16 19:50:35 -0800 | [diff] [blame] | 3330 | seq_printf(seq, " %-8s %pF\n", |
| 3331 | pt->dev ? pt->dev->name : "", pt->func); |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3332 | } |
| 3333 | |
| 3334 | return 0; |
| 3335 | } |
| 3336 | |
| 3337 | static const struct seq_operations ptype_seq_ops = { |
| 3338 | .start = ptype_seq_start, |
| 3339 | .next = ptype_seq_next, |
| 3340 | .stop = ptype_seq_stop, |
| 3341 | .show = ptype_seq_show, |
| 3342 | }; |
| 3343 | |
| 3344 | static int ptype_seq_open(struct inode *inode, struct file *file) |
| 3345 | { |
Pavel Emelyanov | 2feb27d | 2008-03-24 14:57:45 -0700 | [diff] [blame] | 3346 | return seq_open_net(inode, file, &ptype_seq_ops, |
| 3347 | sizeof(struct seq_net_private)); |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3348 | } |
| 3349 | |
| 3350 | static const struct file_operations ptype_seq_fops = { |
| 3351 | .owner = THIS_MODULE, |
| 3352 | .open = ptype_seq_open, |
| 3353 | .read = seq_read, |
| 3354 | .llseek = seq_lseek, |
Pavel Emelyanov | 2feb27d | 2008-03-24 14:57:45 -0700 | [diff] [blame] | 3355 | .release = seq_release_net, |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3356 | }; |
| 3357 | |
| 3358 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3359 | static int __net_init dev_proc_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3360 | { |
| 3361 | int rc = -ENOMEM; |
| 3362 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3363 | if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3364 | goto out; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3365 | 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] | 3366 | goto out_dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3367 | 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] | 3368 | goto out_softnet; |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3369 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3370 | if (wext_proc_init(net)) |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 3371 | goto out_ptype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3372 | rc = 0; |
| 3373 | out: |
| 3374 | return rc; |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 3375 | out_ptype: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3376 | proc_net_remove(net, "ptype"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3377 | out_softnet: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3378 | proc_net_remove(net, "softnet_stat"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3379 | out_dev: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3380 | proc_net_remove(net, "dev"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3381 | goto out; |
| 3382 | } |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3383 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3384 | static void __net_exit dev_proc_net_exit(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3385 | { |
| 3386 | wext_proc_exit(net); |
| 3387 | |
| 3388 | proc_net_remove(net, "ptype"); |
| 3389 | proc_net_remove(net, "softnet_stat"); |
| 3390 | proc_net_remove(net, "dev"); |
| 3391 | } |
| 3392 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 3393 | static struct pernet_operations __net_initdata dev_proc_ops = { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3394 | .init = dev_proc_net_init, |
| 3395 | .exit = dev_proc_net_exit, |
| 3396 | }; |
| 3397 | |
| 3398 | static int __init dev_proc_init(void) |
| 3399 | { |
| 3400 | return register_pernet_subsys(&dev_proc_ops); |
| 3401 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3402 | #else |
| 3403 | #define dev_proc_init() 0 |
| 3404 | #endif /* CONFIG_PROC_FS */ |
| 3405 | |
| 3406 | |
| 3407 | /** |
| 3408 | * netdev_set_master - set up master/slave pair |
| 3409 | * @slave: slave device |
| 3410 | * @master: new master device |
| 3411 | * |
| 3412 | * Changes the master device of the slave. Pass %NULL to break the |
| 3413 | * bonding. The caller must hold the RTNL semaphore. On a failure |
| 3414 | * a negative errno code is returned. On success the reference counts |
| 3415 | * are adjusted, %RTM_NEWLINK is sent to the routing socket and the |
| 3416 | * function returns zero. |
| 3417 | */ |
| 3418 | int netdev_set_master(struct net_device *slave, struct net_device *master) |
| 3419 | { |
| 3420 | struct net_device *old = slave->master; |
| 3421 | |
| 3422 | ASSERT_RTNL(); |
| 3423 | |
| 3424 | if (master) { |
| 3425 | if (old) |
| 3426 | return -EBUSY; |
| 3427 | dev_hold(master); |
| 3428 | } |
| 3429 | |
| 3430 | slave->master = master; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3431 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3432 | synchronize_net(); |
| 3433 | |
| 3434 | if (old) |
| 3435 | dev_put(old); |
| 3436 | |
| 3437 | if (master) |
| 3438 | slave->flags |= IFF_SLAVE; |
| 3439 | else |
| 3440 | slave->flags &= ~IFF_SLAVE; |
| 3441 | |
| 3442 | rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE); |
| 3443 | return 0; |
| 3444 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3445 | EXPORT_SYMBOL(netdev_set_master); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3446 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 3447 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
| 3448 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 3449 | const struct net_device_ops *ops = dev->netdev_ops; |
| 3450 | |
| 3451 | if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags) |
| 3452 | ops->ndo_change_rx_flags(dev, flags); |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 3453 | } |
| 3454 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3455 | static int __dev_set_promiscuity(struct net_device *dev, int inc) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3456 | { |
| 3457 | unsigned short old_flags = dev->flags; |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 3458 | uid_t uid; |
| 3459 | gid_t gid; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3460 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 3461 | ASSERT_RTNL(); |
| 3462 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3463 | dev->flags |= IFF_PROMISC; |
| 3464 | dev->promiscuity += inc; |
| 3465 | if (dev->promiscuity == 0) { |
| 3466 | /* |
| 3467 | * Avoid overflow. |
| 3468 | * If inc causes overflow, untouch promisc and return error. |
| 3469 | */ |
| 3470 | if (inc < 0) |
| 3471 | dev->flags &= ~IFF_PROMISC; |
| 3472 | else { |
| 3473 | dev->promiscuity -= inc; |
| 3474 | printk(KERN_WARNING "%s: promiscuity touches roof, " |
| 3475 | "set promiscuity failed, promiscuity feature " |
| 3476 | "of device might be broken.\n", dev->name); |
| 3477 | return -EOVERFLOW; |
| 3478 | } |
| 3479 | } |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3480 | if (dev->flags != old_flags) { |
| 3481 | printk(KERN_INFO "device %s %s promiscuous mode\n", |
| 3482 | dev->name, (dev->flags & IFF_PROMISC) ? "entered" : |
| 3483 | "left"); |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 3484 | if (audit_enabled) { |
| 3485 | current_uid_gid(&uid, &gid); |
Klaus Heinrich Kiwi | 7759db8 | 2008-01-23 22:57:45 -0500 | [diff] [blame] | 3486 | audit_log(current->audit_context, GFP_ATOMIC, |
| 3487 | AUDIT_ANOM_PROMISCUOUS, |
| 3488 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", |
| 3489 | dev->name, (dev->flags & IFF_PROMISC), |
| 3490 | (old_flags & IFF_PROMISC), |
| 3491 | audit_get_loginuid(current), |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 3492 | uid, gid, |
Klaus Heinrich Kiwi | 7759db8 | 2008-01-23 22:57:45 -0500 | [diff] [blame] | 3493 | audit_get_sessionid(current)); |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 3494 | } |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 3495 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 3496 | dev_change_rx_flags(dev, IFF_PROMISC); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3497 | } |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3498 | return 0; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3499 | } |
| 3500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3501 | /** |
| 3502 | * dev_set_promiscuity - update promiscuity count on a device |
| 3503 | * @dev: device |
| 3504 | * @inc: modifier |
| 3505 | * |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 3506 | * 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] | 3507 | * remains above zero the interface remains promiscuous. Once it hits zero |
| 3508 | * the device reverts back to normal filtering operation. A negative inc |
| 3509 | * value is used to drop promiscuity on the device. |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3510 | * Return 0 if successful or a negative errno code on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3511 | */ |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3512 | int dev_set_promiscuity(struct net_device *dev, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3513 | { |
| 3514 | unsigned short old_flags = dev->flags; |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3515 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3516 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3517 | err = __dev_set_promiscuity(dev, inc); |
Patrick McHardy | 4b5a698 | 2008-07-06 15:49:08 -0700 | [diff] [blame] | 3518 | if (err < 0) |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3519 | return err; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3520 | if (dev->flags != old_flags) |
| 3521 | dev_set_rx_mode(dev); |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3522 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3523 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3524 | EXPORT_SYMBOL(dev_set_promiscuity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3525 | |
| 3526 | /** |
| 3527 | * dev_set_allmulti - update allmulti count on a device |
| 3528 | * @dev: device |
| 3529 | * @inc: modifier |
| 3530 | * |
| 3531 | * Add or remove reception of all multicast frames to a device. While the |
| 3532 | * count in the device remains above zero the interface remains listening |
| 3533 | * to all interfaces. Once it hits zero the device reverts back to normal |
| 3534 | * filtering operation. A negative @inc value is used to drop the counter |
| 3535 | * when releasing a resource needing all multicasts. |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3536 | * Return 0 if successful or a negative errno code on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3537 | */ |
| 3538 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3539 | int dev_set_allmulti(struct net_device *dev, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3540 | { |
| 3541 | unsigned short old_flags = dev->flags; |
| 3542 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 3543 | ASSERT_RTNL(); |
| 3544 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3545 | dev->flags |= IFF_ALLMULTI; |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3546 | dev->allmulti += inc; |
| 3547 | if (dev->allmulti == 0) { |
| 3548 | /* |
| 3549 | * Avoid overflow. |
| 3550 | * If inc causes overflow, untouch allmulti and return error. |
| 3551 | */ |
| 3552 | if (inc < 0) |
| 3553 | dev->flags &= ~IFF_ALLMULTI; |
| 3554 | else { |
| 3555 | dev->allmulti -= inc; |
| 3556 | printk(KERN_WARNING "%s: allmulti touches roof, " |
| 3557 | "set allmulti failed, allmulti feature of " |
| 3558 | "device might be broken.\n", dev->name); |
| 3559 | return -EOVERFLOW; |
| 3560 | } |
| 3561 | } |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 3562 | if (dev->flags ^ old_flags) { |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 3563 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3564 | dev_set_rx_mode(dev); |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 3565 | } |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 3566 | return 0; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3567 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3568 | EXPORT_SYMBOL(dev_set_allmulti); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3569 | |
| 3570 | /* |
| 3571 | * Upload unicast and multicast address lists to device and |
| 3572 | * configure RX filtering. When the device doesn't support unicast |
Joe Perches | 53ccaae | 2007-12-20 14:02:06 -0800 | [diff] [blame] | 3573 | * filtering it is put in promiscuous mode while unicast addresses |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3574 | * are present. |
| 3575 | */ |
| 3576 | void __dev_set_rx_mode(struct net_device *dev) |
| 3577 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 3578 | const struct net_device_ops *ops = dev->netdev_ops; |
| 3579 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3580 | /* dev_open will call this function so the list will stay sane. */ |
| 3581 | if (!(dev->flags&IFF_UP)) |
| 3582 | return; |
| 3583 | |
| 3584 | if (!netif_device_present(dev)) |
YOSHIFUJI Hideaki | 40b77c9 | 2007-07-19 10:43:23 +0900 | [diff] [blame] | 3585 | return; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3586 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 3587 | if (ops->ndo_set_rx_mode) |
| 3588 | ops->ndo_set_rx_mode(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3589 | else { |
| 3590 | /* Unicast addresses changes may only happen under the rtnl, |
| 3591 | * therefore calling __dev_set_promiscuity here is safe. |
| 3592 | */ |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3593 | if (dev->uc.count > 0 && !dev->uc_promisc) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3594 | __dev_set_promiscuity(dev, 1); |
| 3595 | dev->uc_promisc = 1; |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3596 | } else if (dev->uc.count == 0 && dev->uc_promisc) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3597 | __dev_set_promiscuity(dev, -1); |
| 3598 | dev->uc_promisc = 0; |
| 3599 | } |
| 3600 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 3601 | if (ops->ndo_set_multicast_list) |
| 3602 | ops->ndo_set_multicast_list(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3603 | } |
| 3604 | } |
| 3605 | |
| 3606 | void dev_set_rx_mode(struct net_device *dev) |
| 3607 | { |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 3608 | netif_addr_lock_bh(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3609 | __dev_set_rx_mode(dev); |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 3610 | netif_addr_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3611 | } |
| 3612 | |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3613 | /* hw addresses list handling functions */ |
| 3614 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3615 | static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr, |
| 3616 | int addr_len, unsigned char addr_type) |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3617 | { |
| 3618 | struct netdev_hw_addr *ha; |
| 3619 | int alloc_size; |
| 3620 | |
| 3621 | if (addr_len > MAX_ADDR_LEN) |
| 3622 | return -EINVAL; |
| 3623 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3624 | list_for_each_entry(ha, &list->list, list) { |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3625 | if (!memcmp(ha->addr, addr, addr_len) && |
| 3626 | ha->type == addr_type) { |
| 3627 | ha->refcount++; |
| 3628 | return 0; |
| 3629 | } |
| 3630 | } |
| 3631 | |
| 3632 | |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3633 | alloc_size = sizeof(*ha); |
| 3634 | if (alloc_size < L1_CACHE_BYTES) |
| 3635 | alloc_size = L1_CACHE_BYTES; |
| 3636 | ha = kmalloc(alloc_size, GFP_ATOMIC); |
| 3637 | if (!ha) |
| 3638 | return -ENOMEM; |
| 3639 | memcpy(ha->addr, addr, addr_len); |
| 3640 | ha->type = addr_type; |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3641 | ha->refcount = 1; |
| 3642 | ha->synced = false; |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3643 | list_add_tail_rcu(&ha->list, &list->list); |
| 3644 | list->count++; |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3645 | return 0; |
| 3646 | } |
| 3647 | |
| 3648 | static void ha_rcu_free(struct rcu_head *head) |
| 3649 | { |
| 3650 | struct netdev_hw_addr *ha; |
| 3651 | |
| 3652 | ha = container_of(head, struct netdev_hw_addr, rcu_head); |
| 3653 | kfree(ha); |
| 3654 | } |
| 3655 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3656 | static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr, |
| 3657 | int addr_len, unsigned char addr_type) |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3658 | { |
| 3659 | struct netdev_hw_addr *ha; |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3660 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3661 | list_for_each_entry(ha, &list->list, list) { |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3662 | if (!memcmp(ha->addr, addr, addr_len) && |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3663 | (ha->type == addr_type || !addr_type)) { |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3664 | if (--ha->refcount) |
| 3665 | return 0; |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3666 | list_del_rcu(&ha->list); |
| 3667 | call_rcu(&ha->rcu_head, ha_rcu_free); |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3668 | list->count--; |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3669 | return 0; |
| 3670 | } |
| 3671 | } |
| 3672 | return -ENOENT; |
| 3673 | } |
| 3674 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3675 | static int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list, |
| 3676 | struct netdev_hw_addr_list *from_list, |
| 3677 | int addr_len, |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3678 | unsigned char addr_type) |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3679 | { |
| 3680 | int err; |
| 3681 | struct netdev_hw_addr *ha, *ha2; |
| 3682 | unsigned char type; |
| 3683 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3684 | list_for_each_entry(ha, &from_list->list, list) { |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3685 | type = addr_type ? addr_type : ha->type; |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3686 | err = __hw_addr_add(to_list, ha->addr, addr_len, type); |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3687 | if (err) |
| 3688 | goto unroll; |
| 3689 | } |
| 3690 | return 0; |
| 3691 | |
| 3692 | unroll: |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3693 | list_for_each_entry(ha2, &from_list->list, list) { |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3694 | if (ha2 == ha) |
| 3695 | break; |
| 3696 | type = addr_type ? addr_type : ha2->type; |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3697 | __hw_addr_del(to_list, ha2->addr, addr_len, type); |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3698 | } |
| 3699 | return err; |
| 3700 | } |
| 3701 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3702 | static void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list, |
| 3703 | struct netdev_hw_addr_list *from_list, |
| 3704 | int addr_len, |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3705 | unsigned char addr_type) |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3706 | { |
| 3707 | struct netdev_hw_addr *ha; |
| 3708 | unsigned char type; |
| 3709 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3710 | list_for_each_entry(ha, &from_list->list, list) { |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3711 | type = addr_type ? addr_type : ha->type; |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3712 | __hw_addr_del(to_list, ha->addr, addr_len, addr_type); |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3713 | } |
| 3714 | } |
| 3715 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3716 | static int __hw_addr_sync(struct netdev_hw_addr_list *to_list, |
| 3717 | struct netdev_hw_addr_list *from_list, |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3718 | int addr_len) |
| 3719 | { |
| 3720 | int err = 0; |
| 3721 | struct netdev_hw_addr *ha, *tmp; |
| 3722 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3723 | list_for_each_entry_safe(ha, tmp, &from_list->list, list) { |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3724 | if (!ha->synced) { |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3725 | err = __hw_addr_add(to_list, ha->addr, |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3726 | addr_len, ha->type); |
| 3727 | if (err) |
| 3728 | break; |
| 3729 | ha->synced = true; |
| 3730 | ha->refcount++; |
| 3731 | } else if (ha->refcount == 1) { |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3732 | __hw_addr_del(to_list, ha->addr, addr_len, ha->type); |
| 3733 | __hw_addr_del(from_list, ha->addr, addr_len, ha->type); |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3734 | } |
| 3735 | } |
| 3736 | return err; |
| 3737 | } |
| 3738 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3739 | static void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, |
| 3740 | struct netdev_hw_addr_list *from_list, |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3741 | int addr_len) |
| 3742 | { |
| 3743 | struct netdev_hw_addr *ha, *tmp; |
| 3744 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3745 | list_for_each_entry_safe(ha, tmp, &from_list->list, list) { |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3746 | if (ha->synced) { |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3747 | __hw_addr_del(to_list, ha->addr, |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3748 | addr_len, ha->type); |
| 3749 | ha->synced = false; |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3750 | __hw_addr_del(from_list, ha->addr, |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3751 | addr_len, ha->type); |
| 3752 | } |
| 3753 | } |
| 3754 | } |
| 3755 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3756 | static void __hw_addr_flush(struct netdev_hw_addr_list *list) |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3757 | { |
| 3758 | struct netdev_hw_addr *ha, *tmp; |
| 3759 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3760 | list_for_each_entry_safe(ha, tmp, &list->list, list) { |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3761 | list_del_rcu(&ha->list); |
| 3762 | call_rcu(&ha->rcu_head, ha_rcu_free); |
| 3763 | } |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3764 | list->count = 0; |
| 3765 | } |
| 3766 | |
| 3767 | static void __hw_addr_init(struct netdev_hw_addr_list *list) |
| 3768 | { |
| 3769 | INIT_LIST_HEAD(&list->list); |
| 3770 | list->count = 0; |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3771 | } |
| 3772 | |
| 3773 | /* Device addresses handling functions */ |
| 3774 | |
| 3775 | static void dev_addr_flush(struct net_device *dev) |
| 3776 | { |
| 3777 | /* rtnl_mutex must be held here */ |
| 3778 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3779 | __hw_addr_flush(&dev->dev_addrs); |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3780 | dev->dev_addr = NULL; |
| 3781 | } |
| 3782 | |
| 3783 | static int dev_addr_init(struct net_device *dev) |
| 3784 | { |
| 3785 | unsigned char addr[MAX_ADDR_LEN]; |
| 3786 | struct netdev_hw_addr *ha; |
| 3787 | int err; |
| 3788 | |
| 3789 | /* rtnl_mutex must be held here */ |
| 3790 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3791 | __hw_addr_init(&dev->dev_addrs); |
Eric Dumazet | 0c27922 | 2009-06-08 03:49:24 +0000 | [diff] [blame] | 3792 | memset(addr, 0, sizeof(addr)); |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3793 | err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr), |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3794 | NETDEV_HW_ADDR_T_LAN); |
| 3795 | if (!err) { |
| 3796 | /* |
| 3797 | * Get the first (previously created) address from the list |
| 3798 | * and set dev_addr pointer to this location. |
| 3799 | */ |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3800 | ha = list_first_entry(&dev->dev_addrs.list, |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3801 | struct netdev_hw_addr, list); |
| 3802 | dev->dev_addr = ha->addr; |
| 3803 | } |
| 3804 | return err; |
| 3805 | } |
| 3806 | |
| 3807 | /** |
| 3808 | * dev_addr_add - Add a device address |
| 3809 | * @dev: device |
| 3810 | * @addr: address to add |
| 3811 | * @addr_type: address type |
| 3812 | * |
| 3813 | * Add a device address to the device or increase the reference count if |
| 3814 | * it already exists. |
| 3815 | * |
| 3816 | * The caller must hold the rtnl_mutex. |
| 3817 | */ |
| 3818 | int dev_addr_add(struct net_device *dev, unsigned char *addr, |
| 3819 | unsigned char addr_type) |
| 3820 | { |
| 3821 | int err; |
| 3822 | |
| 3823 | ASSERT_RTNL(); |
| 3824 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3825 | err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type); |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3826 | if (!err) |
| 3827 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
| 3828 | return err; |
| 3829 | } |
| 3830 | EXPORT_SYMBOL(dev_addr_add); |
| 3831 | |
| 3832 | /** |
| 3833 | * dev_addr_del - Release a device address. |
| 3834 | * @dev: device |
| 3835 | * @addr: address to delete |
| 3836 | * @addr_type: address type |
| 3837 | * |
| 3838 | * Release reference to a device address and remove it from the device |
| 3839 | * if the reference count drops to zero. |
| 3840 | * |
| 3841 | * The caller must hold the rtnl_mutex. |
| 3842 | */ |
| 3843 | int dev_addr_del(struct net_device *dev, unsigned char *addr, |
| 3844 | unsigned char addr_type) |
| 3845 | { |
| 3846 | int err; |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3847 | struct netdev_hw_addr *ha; |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3848 | |
| 3849 | ASSERT_RTNL(); |
| 3850 | |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3851 | /* |
| 3852 | * We can not remove the first address from the list because |
| 3853 | * dev->dev_addr points to that. |
| 3854 | */ |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3855 | ha = list_first_entry(&dev->dev_addrs.list, |
| 3856 | struct netdev_hw_addr, list); |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3857 | if (ha->addr == dev->dev_addr && ha->refcount == 1) |
| 3858 | return -ENOENT; |
| 3859 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3860 | err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len, |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3861 | addr_type); |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3862 | if (!err) |
| 3863 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
| 3864 | return err; |
| 3865 | } |
| 3866 | EXPORT_SYMBOL(dev_addr_del); |
| 3867 | |
| 3868 | /** |
| 3869 | * dev_addr_add_multiple - Add device addresses from another device |
| 3870 | * @to_dev: device to which addresses will be added |
| 3871 | * @from_dev: device from which addresses will be added |
| 3872 | * @addr_type: address type - 0 means type will be used from from_dev |
| 3873 | * |
| 3874 | * Add device addresses of the one device to another. |
| 3875 | ** |
| 3876 | * The caller must hold the rtnl_mutex. |
| 3877 | */ |
| 3878 | int dev_addr_add_multiple(struct net_device *to_dev, |
| 3879 | struct net_device *from_dev, |
| 3880 | unsigned char addr_type) |
| 3881 | { |
| 3882 | int err; |
| 3883 | |
| 3884 | ASSERT_RTNL(); |
| 3885 | |
| 3886 | if (from_dev->addr_len != to_dev->addr_len) |
| 3887 | return -EINVAL; |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3888 | err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3889 | to_dev->addr_len, addr_type); |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3890 | if (!err) |
| 3891 | call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); |
| 3892 | return err; |
| 3893 | } |
| 3894 | EXPORT_SYMBOL(dev_addr_add_multiple); |
| 3895 | |
| 3896 | /** |
| 3897 | * dev_addr_del_multiple - Delete device addresses by another device |
| 3898 | * @to_dev: device where the addresses will be deleted |
| 3899 | * @from_dev: device by which addresses the addresses will be deleted |
| 3900 | * @addr_type: address type - 0 means type will used from from_dev |
| 3901 | * |
| 3902 | * Deletes addresses in to device by the list of addresses in from device. |
| 3903 | * |
| 3904 | * The caller must hold the rtnl_mutex. |
| 3905 | */ |
| 3906 | int dev_addr_del_multiple(struct net_device *to_dev, |
| 3907 | struct net_device *from_dev, |
| 3908 | unsigned char addr_type) |
| 3909 | { |
| 3910 | ASSERT_RTNL(); |
| 3911 | |
| 3912 | if (from_dev->addr_len != to_dev->addr_len) |
| 3913 | return -EINVAL; |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3914 | __hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3915 | to_dev->addr_len, addr_type); |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3916 | call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); |
| 3917 | return 0; |
| 3918 | } |
| 3919 | EXPORT_SYMBOL(dev_addr_del_multiple); |
| 3920 | |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3921 | /* multicast addresses handling functions */ |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 3922 | |
Patrick McHardy | 61cbc2f | 2007-06-30 13:35:52 -0700 | [diff] [blame] | 3923 | int __dev_addr_delete(struct dev_addr_list **list, int *count, |
| 3924 | void *addr, int alen, int glbl) |
Patrick McHardy | bf74248 | 2007-06-27 01:26:19 -0700 | [diff] [blame] | 3925 | { |
| 3926 | struct dev_addr_list *da; |
| 3927 | |
| 3928 | for (; (da = *list) != NULL; list = &da->next) { |
| 3929 | if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 && |
| 3930 | alen == da->da_addrlen) { |
| 3931 | if (glbl) { |
| 3932 | int old_glbl = da->da_gusers; |
| 3933 | da->da_gusers = 0; |
| 3934 | if (old_glbl == 0) |
| 3935 | break; |
| 3936 | } |
| 3937 | if (--da->da_users) |
| 3938 | return 0; |
| 3939 | |
| 3940 | *list = da->next; |
| 3941 | kfree(da); |
Patrick McHardy | 61cbc2f | 2007-06-30 13:35:52 -0700 | [diff] [blame] | 3942 | (*count)--; |
Patrick McHardy | bf74248 | 2007-06-27 01:26:19 -0700 | [diff] [blame] | 3943 | return 0; |
| 3944 | } |
| 3945 | } |
| 3946 | return -ENOENT; |
| 3947 | } |
| 3948 | |
Patrick McHardy | 61cbc2f | 2007-06-30 13:35:52 -0700 | [diff] [blame] | 3949 | int __dev_addr_add(struct dev_addr_list **list, int *count, |
| 3950 | void *addr, int alen, int glbl) |
Patrick McHardy | bf74248 | 2007-06-27 01:26:19 -0700 | [diff] [blame] | 3951 | { |
| 3952 | struct dev_addr_list *da; |
| 3953 | |
| 3954 | for (da = *list; da != NULL; da = da->next) { |
| 3955 | if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 && |
| 3956 | da->da_addrlen == alen) { |
| 3957 | if (glbl) { |
| 3958 | int old_glbl = da->da_gusers; |
| 3959 | da->da_gusers = 1; |
| 3960 | if (old_glbl) |
| 3961 | return 0; |
| 3962 | } |
| 3963 | da->da_users++; |
| 3964 | return 0; |
| 3965 | } |
| 3966 | } |
| 3967 | |
Jorge Boncompte [DTI2] | 12aa343 | 2008-02-19 14:17:04 -0800 | [diff] [blame] | 3968 | da = kzalloc(sizeof(*da), GFP_ATOMIC); |
Patrick McHardy | bf74248 | 2007-06-27 01:26:19 -0700 | [diff] [blame] | 3969 | if (da == NULL) |
| 3970 | return -ENOMEM; |
| 3971 | memcpy(da->da_addr, addr, alen); |
| 3972 | da->da_addrlen = alen; |
| 3973 | da->da_users = 1; |
| 3974 | da->da_gusers = glbl ? 1 : 0; |
| 3975 | da->next = *list; |
| 3976 | *list = da; |
Patrick McHardy | 61cbc2f | 2007-06-30 13:35:52 -0700 | [diff] [blame] | 3977 | (*count)++; |
Patrick McHardy | bf74248 | 2007-06-27 01:26:19 -0700 | [diff] [blame] | 3978 | return 0; |
| 3979 | } |
| 3980 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3981 | /** |
| 3982 | * dev_unicast_delete - Release secondary unicast address. |
| 3983 | * @dev: device |
Randy Dunlap | 0ed72ec | 2007-07-26 00:03:29 -0700 | [diff] [blame] | 3984 | * @addr: address to delete |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3985 | * |
| 3986 | * Release reference to a secondary unicast address and remove it |
Randy Dunlap | 0ed72ec | 2007-07-26 00:03:29 -0700 | [diff] [blame] | 3987 | * from the device if the reference count drops to zero. |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3988 | * |
| 3989 | * The caller must hold the rtnl_mutex. |
| 3990 | */ |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 3991 | int dev_unicast_delete(struct net_device *dev, void *addr) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 3992 | { |
| 3993 | int err; |
| 3994 | |
| 3995 | ASSERT_RTNL(); |
| 3996 | |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 3997 | netif_addr_lock_bh(dev); |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 3998 | err = __hw_addr_del(&dev->uc, addr, dev->addr_len, |
| 3999 | NETDEV_HW_ADDR_T_UNICAST); |
Patrick McHardy | 61cbc2f | 2007-06-30 13:35:52 -0700 | [diff] [blame] | 4000 | if (!err) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4001 | __dev_set_rx_mode(dev); |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 4002 | netif_addr_unlock_bh(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4003 | return err; |
| 4004 | } |
| 4005 | EXPORT_SYMBOL(dev_unicast_delete); |
| 4006 | |
| 4007 | /** |
| 4008 | * dev_unicast_add - add a secondary unicast address |
| 4009 | * @dev: device |
Wang Chen | 5dbaec5 | 2008-06-27 19:35:16 -0700 | [diff] [blame] | 4010 | * @addr: address to add |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4011 | * |
| 4012 | * Add a secondary unicast address to the device or increase |
| 4013 | * the reference count if it already exists. |
| 4014 | * |
| 4015 | * The caller must hold the rtnl_mutex. |
| 4016 | */ |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 4017 | int dev_unicast_add(struct net_device *dev, void *addr) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4018 | { |
| 4019 | int err; |
| 4020 | |
| 4021 | ASSERT_RTNL(); |
| 4022 | |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 4023 | netif_addr_lock_bh(dev); |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 4024 | err = __hw_addr_add(&dev->uc, addr, dev->addr_len, |
| 4025 | NETDEV_HW_ADDR_T_UNICAST); |
Patrick McHardy | 61cbc2f | 2007-06-30 13:35:52 -0700 | [diff] [blame] | 4026 | if (!err) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4027 | __dev_set_rx_mode(dev); |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 4028 | netif_addr_unlock_bh(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4029 | return err; |
| 4030 | } |
| 4031 | EXPORT_SYMBOL(dev_unicast_add); |
| 4032 | |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 4033 | int __dev_addr_sync(struct dev_addr_list **to, int *to_count, |
| 4034 | struct dev_addr_list **from, int *from_count) |
| 4035 | { |
| 4036 | struct dev_addr_list *da, *next; |
| 4037 | int err = 0; |
| 4038 | |
| 4039 | da = *from; |
| 4040 | while (da != NULL) { |
| 4041 | next = da->next; |
| 4042 | if (!da->da_synced) { |
| 4043 | err = __dev_addr_add(to, to_count, |
| 4044 | da->da_addr, da->da_addrlen, 0); |
| 4045 | if (err < 0) |
| 4046 | break; |
| 4047 | da->da_synced = 1; |
| 4048 | da->da_users++; |
| 4049 | } else if (da->da_users == 1) { |
| 4050 | __dev_addr_delete(to, to_count, |
| 4051 | da->da_addr, da->da_addrlen, 0); |
| 4052 | __dev_addr_delete(from, from_count, |
| 4053 | da->da_addr, da->da_addrlen, 0); |
| 4054 | } |
| 4055 | da = next; |
| 4056 | } |
| 4057 | return err; |
| 4058 | } |
Johannes Berg | c402908 | 2009-06-17 17:43:30 +0200 | [diff] [blame] | 4059 | EXPORT_SYMBOL_GPL(__dev_addr_sync); |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 4060 | |
| 4061 | void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, |
| 4062 | struct dev_addr_list **from, int *from_count) |
| 4063 | { |
| 4064 | struct dev_addr_list *da, *next; |
| 4065 | |
| 4066 | da = *from; |
| 4067 | while (da != NULL) { |
| 4068 | next = da->next; |
| 4069 | if (da->da_synced) { |
| 4070 | __dev_addr_delete(to, to_count, |
| 4071 | da->da_addr, da->da_addrlen, 0); |
| 4072 | da->da_synced = 0; |
| 4073 | __dev_addr_delete(from, from_count, |
| 4074 | da->da_addr, da->da_addrlen, 0); |
| 4075 | } |
| 4076 | da = next; |
| 4077 | } |
| 4078 | } |
Johannes Berg | c402908 | 2009-06-17 17:43:30 +0200 | [diff] [blame] | 4079 | EXPORT_SYMBOL_GPL(__dev_addr_unsync); |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 4080 | |
| 4081 | /** |
| 4082 | * dev_unicast_sync - Synchronize device's unicast list to another device |
| 4083 | * @to: destination device |
| 4084 | * @from: source device |
| 4085 | * |
| 4086 | * Add newly added addresses to the destination device and release |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 4087 | * addresses that have no users left. The source device must be |
| 4088 | * locked by netif_tx_lock_bh. |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 4089 | * |
| 4090 | * This function is intended to be called from the dev->set_rx_mode |
| 4091 | * function of layered software devices. |
| 4092 | */ |
| 4093 | int dev_unicast_sync(struct net_device *to, struct net_device *from) |
| 4094 | { |
| 4095 | int err = 0; |
| 4096 | |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 4097 | if (to->addr_len != from->addr_len) |
| 4098 | return -EINVAL; |
| 4099 | |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 4100 | netif_addr_lock_bh(to); |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 4101 | err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len); |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 4102 | if (!err) |
| 4103 | __dev_set_rx_mode(to); |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 4104 | netif_addr_unlock_bh(to); |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 4105 | return err; |
| 4106 | } |
| 4107 | EXPORT_SYMBOL(dev_unicast_sync); |
| 4108 | |
| 4109 | /** |
Randy Dunlap | bc2cda1 | 2008-02-13 15:03:25 -0800 | [diff] [blame] | 4110 | * dev_unicast_unsync - Remove synchronized addresses from the destination device |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 4111 | * @to: destination device |
| 4112 | * @from: source device |
| 4113 | * |
| 4114 | * Remove all addresses that were added to the destination device by |
| 4115 | * dev_unicast_sync(). This function is intended to be called from the |
| 4116 | * dev->stop function of layered software devices. |
| 4117 | */ |
| 4118 | void dev_unicast_unsync(struct net_device *to, struct net_device *from) |
| 4119 | { |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 4120 | if (to->addr_len != from->addr_len) |
| 4121 | return; |
| 4122 | |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 4123 | netif_addr_lock_bh(from); |
| 4124 | netif_addr_lock(to); |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 4125 | __hw_addr_unsync(&to->uc, &from->uc, to->addr_len); |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 4126 | __dev_set_rx_mode(to); |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 4127 | netif_addr_unlock(to); |
| 4128 | netif_addr_unlock_bh(from); |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 4129 | } |
| 4130 | EXPORT_SYMBOL(dev_unicast_unsync); |
| 4131 | |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 4132 | static void dev_unicast_flush(struct net_device *dev) |
| 4133 | { |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 4134 | netif_addr_lock_bh(dev); |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 4135 | __hw_addr_flush(&dev->uc); |
Jiri Pirko | a6ac65d | 2009-07-30 01:06:12 +0000 | [diff] [blame] | 4136 | netif_addr_unlock_bh(dev); |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 4137 | } |
| 4138 | |
| 4139 | static void dev_unicast_init(struct net_device *dev) |
| 4140 | { |
Jiri Pirko | 31278e7 | 2009-06-17 01:12:19 +0000 | [diff] [blame] | 4141 | __hw_addr_init(&dev->uc); |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 4142 | } |
| 4143 | |
| 4144 | |
Denis Cheng | 1297262 | 2007-07-18 02:12:56 -0700 | [diff] [blame] | 4145 | static void __dev_addr_discard(struct dev_addr_list **list) |
| 4146 | { |
| 4147 | struct dev_addr_list *tmp; |
| 4148 | |
| 4149 | while (*list != NULL) { |
| 4150 | tmp = *list; |
| 4151 | *list = tmp->next; |
| 4152 | if (tmp->da_users > tmp->da_gusers) |
| 4153 | printk("__dev_addr_discard: address leakage! " |
| 4154 | "da_users=%d\n", tmp->da_users); |
| 4155 | kfree(tmp); |
| 4156 | } |
| 4157 | } |
| 4158 | |
Denis Cheng | 26cc252 | 2007-07-18 02:12:03 -0700 | [diff] [blame] | 4159 | static void dev_addr_discard(struct net_device *dev) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4160 | { |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 4161 | netif_addr_lock_bh(dev); |
Denis Cheng | 26cc252 | 2007-07-18 02:12:03 -0700 | [diff] [blame] | 4162 | |
Denis Cheng | 456ad75 | 2007-07-18 02:10:54 -0700 | [diff] [blame] | 4163 | __dev_addr_discard(&dev->mc_list); |
| 4164 | dev->mc_count = 0; |
Denis Cheng | 26cc252 | 2007-07-18 02:12:03 -0700 | [diff] [blame] | 4165 | |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 4166 | netif_addr_unlock_bh(dev); |
Denis Cheng | 456ad75 | 2007-07-18 02:10:54 -0700 | [diff] [blame] | 4167 | } |
| 4168 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4169 | /** |
| 4170 | * dev_get_flags - get flags reported to userspace |
| 4171 | * @dev: device |
| 4172 | * |
| 4173 | * Get the combination of flag bits exported through APIs to userspace. |
| 4174 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4175 | unsigned dev_get_flags(const struct net_device *dev) |
| 4176 | { |
| 4177 | unsigned flags; |
| 4178 | |
| 4179 | flags = (dev->flags & ~(IFF_PROMISC | |
| 4180 | IFF_ALLMULTI | |
Stefan Rompf | b00055a | 2006-03-20 17:09:11 -0800 | [diff] [blame] | 4181 | IFF_RUNNING | |
| 4182 | IFF_LOWER_UP | |
| 4183 | IFF_DORMANT)) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4184 | (dev->gflags & (IFF_PROMISC | |
| 4185 | IFF_ALLMULTI)); |
| 4186 | |
Stefan Rompf | b00055a | 2006-03-20 17:09:11 -0800 | [diff] [blame] | 4187 | if (netif_running(dev)) { |
| 4188 | if (netif_oper_up(dev)) |
| 4189 | flags |= IFF_RUNNING; |
| 4190 | if (netif_carrier_ok(dev)) |
| 4191 | flags |= IFF_LOWER_UP; |
| 4192 | if (netif_dormant(dev)) |
| 4193 | flags |= IFF_DORMANT; |
| 4194 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4195 | |
| 4196 | return flags; |
| 4197 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4198 | EXPORT_SYMBOL(dev_get_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4199 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4200 | /** |
| 4201 | * dev_change_flags - change device settings |
| 4202 | * @dev: device |
| 4203 | * @flags: device state flags |
| 4204 | * |
| 4205 | * Change settings on device based state flags. The flags are |
| 4206 | * in the userspace exported format. |
| 4207 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4208 | int dev_change_flags(struct net_device *dev, unsigned flags) |
| 4209 | { |
Thomas Graf | 7c355f5 | 2007-06-05 16:03:03 -0700 | [diff] [blame] | 4210 | int ret, changes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4211 | int old_flags = dev->flags; |
| 4212 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4213 | ASSERT_RTNL(); |
| 4214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4215 | /* |
| 4216 | * Set the flags on our device. |
| 4217 | */ |
| 4218 | |
| 4219 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | |
| 4220 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | |
| 4221 | IFF_AUTOMEDIA)) | |
| 4222 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | |
| 4223 | IFF_ALLMULTI)); |
| 4224 | |
| 4225 | /* |
| 4226 | * Load in the correct multicast list now the flags have changed. |
| 4227 | */ |
| 4228 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4229 | if ((old_flags ^ flags) & IFF_MULTICAST) |
| 4230 | dev_change_rx_flags(dev, IFF_MULTICAST); |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4231 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4232 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4233 | |
| 4234 | /* |
| 4235 | * Have we downed the interface. We handle IFF_UP ourselves |
| 4236 | * according to user attempts to set it, rather than blindly |
| 4237 | * setting it. |
| 4238 | */ |
| 4239 | |
| 4240 | ret = 0; |
| 4241 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ |
| 4242 | ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev); |
| 4243 | |
| 4244 | if (!ret) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4245 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4246 | } |
| 4247 | |
| 4248 | if (dev->flags & IFF_UP && |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4249 | ((old_flags ^ dev->flags) & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4250 | IFF_VOLATILE))) |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4251 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4252 | |
| 4253 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4254 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
| 4255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4256 | dev->gflags ^= IFF_PROMISC; |
| 4257 | dev_set_promiscuity(dev, inc); |
| 4258 | } |
| 4259 | |
| 4260 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI |
| 4261 | is important. Some (broken) drivers set IFF_PROMISC, when |
| 4262 | IFF_ALLMULTI is requested not asking us and not reporting. |
| 4263 | */ |
| 4264 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4265 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
| 4266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4267 | dev->gflags ^= IFF_ALLMULTI; |
| 4268 | dev_set_allmulti(dev, inc); |
| 4269 | } |
| 4270 | |
Thomas Graf | 7c355f5 | 2007-06-05 16:03:03 -0700 | [diff] [blame] | 4271 | /* Exclude state transition flags, already notified */ |
| 4272 | changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING); |
| 4273 | if (changes) |
| 4274 | rtmsg_ifinfo(RTM_NEWLINK, dev, changes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4275 | |
| 4276 | return ret; |
| 4277 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4278 | EXPORT_SYMBOL(dev_change_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4279 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4280 | /** |
| 4281 | * dev_set_mtu - Change maximum transfer unit |
| 4282 | * @dev: device |
| 4283 | * @new_mtu: new transfer unit |
| 4284 | * |
| 4285 | * Change the maximum transfer size of the network device. |
| 4286 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4287 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
| 4288 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4289 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4290 | int err; |
| 4291 | |
| 4292 | if (new_mtu == dev->mtu) |
| 4293 | return 0; |
| 4294 | |
| 4295 | /* MTU must be positive. */ |
| 4296 | if (new_mtu < 0) |
| 4297 | return -EINVAL; |
| 4298 | |
| 4299 | if (!netif_device_present(dev)) |
| 4300 | return -ENODEV; |
| 4301 | |
| 4302 | err = 0; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4303 | if (ops->ndo_change_mtu) |
| 4304 | err = ops->ndo_change_mtu(dev, new_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4305 | else |
| 4306 | dev->mtu = new_mtu; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4308 | if (!err && dev->flags & IFF_UP) |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4309 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4310 | return err; |
| 4311 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4312 | EXPORT_SYMBOL(dev_set_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4313 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4314 | /** |
| 4315 | * dev_set_mac_address - Change Media Access Control Address |
| 4316 | * @dev: device |
| 4317 | * @sa: new address |
| 4318 | * |
| 4319 | * Change the hardware (MAC) address of the device |
| 4320 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4321 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
| 4322 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4323 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4324 | int err; |
| 4325 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4326 | if (!ops->ndo_set_mac_address) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4327 | return -EOPNOTSUPP; |
| 4328 | if (sa->sa_family != dev->type) |
| 4329 | return -EINVAL; |
| 4330 | if (!netif_device_present(dev)) |
| 4331 | return -ENODEV; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4332 | err = ops->ndo_set_mac_address(dev, sa); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4333 | if (!err) |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4334 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4335 | return err; |
| 4336 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4337 | EXPORT_SYMBOL(dev_set_mac_address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4338 | |
| 4339 | /* |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4340 | * Perform the SIOCxIFxxx calls, inside rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4341 | */ |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4342 | 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] | 4343 | { |
| 4344 | int err; |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4345 | 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] | 4346 | |
| 4347 | if (!dev) |
| 4348 | return -ENODEV; |
| 4349 | |
| 4350 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4351 | case SIOCGIFFLAGS: /* Get interface flags */ |
| 4352 | ifr->ifr_flags = (short) dev_get_flags(dev); |
| 4353 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4354 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4355 | case SIOCGIFMETRIC: /* Get the metric on the interface |
| 4356 | (currently unused) */ |
| 4357 | ifr->ifr_metric = 0; |
| 4358 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4359 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4360 | case SIOCGIFMTU: /* Get the MTU of a device */ |
| 4361 | ifr->ifr_mtu = dev->mtu; |
| 4362 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4363 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4364 | case SIOCGIFHWADDR: |
| 4365 | if (!dev->addr_len) |
| 4366 | memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data); |
| 4367 | else |
| 4368 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, |
| 4369 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); |
| 4370 | ifr->ifr_hwaddr.sa_family = dev->type; |
| 4371 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4372 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4373 | case SIOCGIFSLAVE: |
| 4374 | err = -EINVAL; |
| 4375 | break; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4376 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4377 | case SIOCGIFMAP: |
| 4378 | ifr->ifr_map.mem_start = dev->mem_start; |
| 4379 | ifr->ifr_map.mem_end = dev->mem_end; |
| 4380 | ifr->ifr_map.base_addr = dev->base_addr; |
| 4381 | ifr->ifr_map.irq = dev->irq; |
| 4382 | ifr->ifr_map.dma = dev->dma; |
| 4383 | ifr->ifr_map.port = dev->if_port; |
| 4384 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4385 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4386 | case SIOCGIFINDEX: |
| 4387 | ifr->ifr_ifindex = dev->ifindex; |
| 4388 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4389 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4390 | case SIOCGIFTXQLEN: |
| 4391 | ifr->ifr_qlen = dev->tx_queue_len; |
| 4392 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4393 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4394 | default: |
| 4395 | /* dev_ioctl() should ensure this case |
| 4396 | * is never reached |
| 4397 | */ |
| 4398 | WARN_ON(1); |
| 4399 | err = -EINVAL; |
| 4400 | break; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4401 | |
| 4402 | } |
| 4403 | return err; |
| 4404 | } |
| 4405 | |
| 4406 | /* |
| 4407 | * Perform the SIOCxIFxxx calls, inside rtnl_lock() |
| 4408 | */ |
| 4409 | static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) |
| 4410 | { |
| 4411 | int err; |
| 4412 | struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); |
Jarek Poplawski | 5f2f6da | 2008-12-22 19:35:28 -0800 | [diff] [blame] | 4413 | const struct net_device_ops *ops; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4414 | |
| 4415 | if (!dev) |
| 4416 | return -ENODEV; |
| 4417 | |
Jarek Poplawski | 5f2f6da | 2008-12-22 19:35:28 -0800 | [diff] [blame] | 4418 | ops = dev->netdev_ops; |
| 4419 | |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4420 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4421 | case SIOCSIFFLAGS: /* Set interface flags */ |
| 4422 | return dev_change_flags(dev, ifr->ifr_flags); |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4423 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4424 | case SIOCSIFMETRIC: /* Set the metric on the interface |
| 4425 | (currently unused) */ |
| 4426 | return -EOPNOTSUPP; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4427 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4428 | case SIOCSIFMTU: /* Set the MTU of a device */ |
| 4429 | return dev_set_mtu(dev, ifr->ifr_mtu); |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4430 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4431 | case SIOCSIFHWADDR: |
| 4432 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4433 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4434 | case SIOCSIFHWBROADCAST: |
| 4435 | if (ifr->ifr_hwaddr.sa_family != dev->type) |
| 4436 | return -EINVAL; |
| 4437 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, |
| 4438 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); |
| 4439 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
| 4440 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4441 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4442 | case SIOCSIFMAP: |
| 4443 | if (ops->ndo_set_config) { |
| 4444 | if (!netif_device_present(dev)) |
| 4445 | return -ENODEV; |
| 4446 | return ops->ndo_set_config(dev, &ifr->ifr_map); |
| 4447 | } |
| 4448 | return -EOPNOTSUPP; |
| 4449 | |
| 4450 | case SIOCADDMULTI: |
| 4451 | if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) || |
| 4452 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) |
| 4453 | return -EINVAL; |
| 4454 | if (!netif_device_present(dev)) |
| 4455 | return -ENODEV; |
| 4456 | return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data, |
| 4457 | dev->addr_len, 1); |
| 4458 | |
| 4459 | case SIOCDELMULTI: |
| 4460 | if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) || |
| 4461 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) |
| 4462 | return -EINVAL; |
| 4463 | if (!netif_device_present(dev)) |
| 4464 | return -ENODEV; |
| 4465 | return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data, |
| 4466 | dev->addr_len, 1); |
| 4467 | |
| 4468 | case SIOCSIFTXQLEN: |
| 4469 | if (ifr->ifr_qlen < 0) |
| 4470 | return -EINVAL; |
| 4471 | dev->tx_queue_len = ifr->ifr_qlen; |
| 4472 | return 0; |
| 4473 | |
| 4474 | case SIOCSIFNAME: |
| 4475 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; |
| 4476 | return dev_change_name(dev, ifr->ifr_newname); |
| 4477 | |
| 4478 | /* |
| 4479 | * Unknown or private ioctl |
| 4480 | */ |
| 4481 | default: |
| 4482 | if ((cmd >= SIOCDEVPRIVATE && |
| 4483 | cmd <= SIOCDEVPRIVATE + 15) || |
| 4484 | cmd == SIOCBONDENSLAVE || |
| 4485 | cmd == SIOCBONDRELEASE || |
| 4486 | cmd == SIOCBONDSETHWADDR || |
| 4487 | cmd == SIOCBONDSLAVEINFOQUERY || |
| 4488 | cmd == SIOCBONDINFOQUERY || |
| 4489 | cmd == SIOCBONDCHANGEACTIVE || |
| 4490 | cmd == SIOCGMIIPHY || |
| 4491 | cmd == SIOCGMIIREG || |
| 4492 | cmd == SIOCSMIIREG || |
| 4493 | cmd == SIOCBRADDIF || |
| 4494 | cmd == SIOCBRDELIF || |
| 4495 | cmd == SIOCSHWTSTAMP || |
| 4496 | cmd == SIOCWANDEV) { |
| 4497 | err = -EOPNOTSUPP; |
| 4498 | if (ops->ndo_do_ioctl) { |
| 4499 | if (netif_device_present(dev)) |
| 4500 | err = ops->ndo_do_ioctl(dev, ifr, cmd); |
| 4501 | else |
| 4502 | err = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4503 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4504 | } else |
| 4505 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4506 | |
| 4507 | } |
| 4508 | return err; |
| 4509 | } |
| 4510 | |
| 4511 | /* |
| 4512 | * This function handles all "interface"-type I/O control requests. The actual |
| 4513 | * 'doing' part of this is dev_ifsioc above. |
| 4514 | */ |
| 4515 | |
| 4516 | /** |
| 4517 | * dev_ioctl - network device ioctl |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 4518 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4519 | * @cmd: command to issue |
| 4520 | * @arg: pointer to a struct ifreq in user space |
| 4521 | * |
| 4522 | * Issue ioctl functions to devices. This is normally called by the |
| 4523 | * user space syscall interfaces but can sometimes be useful for |
| 4524 | * other purposes. The return value is the return from the syscall if |
| 4525 | * positive or a negative errno code on error. |
| 4526 | */ |
| 4527 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4528 | int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4529 | { |
| 4530 | struct ifreq ifr; |
| 4531 | int ret; |
| 4532 | char *colon; |
| 4533 | |
| 4534 | /* One special case: SIOCGIFCONF takes ifconf argument |
| 4535 | and requires shared lock, because it sleeps writing |
| 4536 | to user space. |
| 4537 | */ |
| 4538 | |
| 4539 | if (cmd == SIOCGIFCONF) { |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 4540 | rtnl_lock(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4541 | ret = dev_ifconf(net, (char __user *) arg); |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 4542 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4543 | return ret; |
| 4544 | } |
| 4545 | if (cmd == SIOCGIFNAME) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4546 | return dev_ifname(net, (struct ifreq __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4547 | |
| 4548 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) |
| 4549 | return -EFAULT; |
| 4550 | |
| 4551 | ifr.ifr_name[IFNAMSIZ-1] = 0; |
| 4552 | |
| 4553 | colon = strchr(ifr.ifr_name, ':'); |
| 4554 | if (colon) |
| 4555 | *colon = 0; |
| 4556 | |
| 4557 | /* |
| 4558 | * See which interface the caller is talking about. |
| 4559 | */ |
| 4560 | |
| 4561 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4562 | /* |
| 4563 | * These ioctl calls: |
| 4564 | * - can be done by all. |
| 4565 | * - atomic and do not require locking. |
| 4566 | * - return a value |
| 4567 | */ |
| 4568 | case SIOCGIFFLAGS: |
| 4569 | case SIOCGIFMETRIC: |
| 4570 | case SIOCGIFMTU: |
| 4571 | case SIOCGIFHWADDR: |
| 4572 | case SIOCGIFSLAVE: |
| 4573 | case SIOCGIFMAP: |
| 4574 | case SIOCGIFINDEX: |
| 4575 | case SIOCGIFTXQLEN: |
| 4576 | dev_load(net, ifr.ifr_name); |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4577 | rcu_read_lock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4578 | ret = dev_ifsioc_locked(net, &ifr, cmd); |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4579 | rcu_read_unlock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4580 | if (!ret) { |
| 4581 | if (colon) |
| 4582 | *colon = ':'; |
| 4583 | if (copy_to_user(arg, &ifr, |
| 4584 | sizeof(struct ifreq))) |
| 4585 | ret = -EFAULT; |
| 4586 | } |
| 4587 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4588 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4589 | case SIOCETHTOOL: |
| 4590 | dev_load(net, ifr.ifr_name); |
| 4591 | rtnl_lock(); |
| 4592 | ret = dev_ethtool(net, &ifr); |
| 4593 | rtnl_unlock(); |
| 4594 | if (!ret) { |
| 4595 | if (colon) |
| 4596 | *colon = ':'; |
| 4597 | if (copy_to_user(arg, &ifr, |
| 4598 | sizeof(struct ifreq))) |
| 4599 | ret = -EFAULT; |
| 4600 | } |
| 4601 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4602 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4603 | /* |
| 4604 | * These ioctl calls: |
| 4605 | * - require superuser power. |
| 4606 | * - require strict serialization. |
| 4607 | * - return a value |
| 4608 | */ |
| 4609 | case SIOCGMIIPHY: |
| 4610 | case SIOCGMIIREG: |
| 4611 | case SIOCSIFNAME: |
| 4612 | if (!capable(CAP_NET_ADMIN)) |
| 4613 | return -EPERM; |
| 4614 | dev_load(net, ifr.ifr_name); |
| 4615 | rtnl_lock(); |
| 4616 | ret = dev_ifsioc(net, &ifr, cmd); |
| 4617 | rtnl_unlock(); |
| 4618 | if (!ret) { |
| 4619 | if (colon) |
| 4620 | *colon = ':'; |
| 4621 | if (copy_to_user(arg, &ifr, |
| 4622 | sizeof(struct ifreq))) |
| 4623 | ret = -EFAULT; |
| 4624 | } |
| 4625 | return ret; |
| 4626 | |
| 4627 | /* |
| 4628 | * These ioctl calls: |
| 4629 | * - require superuser power. |
| 4630 | * - require strict serialization. |
| 4631 | * - do not return a value |
| 4632 | */ |
| 4633 | case SIOCSIFFLAGS: |
| 4634 | case SIOCSIFMETRIC: |
| 4635 | case SIOCSIFMTU: |
| 4636 | case SIOCSIFMAP: |
| 4637 | case SIOCSIFHWADDR: |
| 4638 | case SIOCSIFSLAVE: |
| 4639 | case SIOCADDMULTI: |
| 4640 | case SIOCDELMULTI: |
| 4641 | case SIOCSIFHWBROADCAST: |
| 4642 | case SIOCSIFTXQLEN: |
| 4643 | case SIOCSMIIREG: |
| 4644 | case SIOCBONDENSLAVE: |
| 4645 | case SIOCBONDRELEASE: |
| 4646 | case SIOCBONDSETHWADDR: |
| 4647 | case SIOCBONDCHANGEACTIVE: |
| 4648 | case SIOCBRADDIF: |
| 4649 | case SIOCBRDELIF: |
| 4650 | case SIOCSHWTSTAMP: |
| 4651 | if (!capable(CAP_NET_ADMIN)) |
| 4652 | return -EPERM; |
| 4653 | /* fall through */ |
| 4654 | case SIOCBONDSLAVEINFOQUERY: |
| 4655 | case SIOCBONDINFOQUERY: |
| 4656 | dev_load(net, ifr.ifr_name); |
| 4657 | rtnl_lock(); |
| 4658 | ret = dev_ifsioc(net, &ifr, cmd); |
| 4659 | rtnl_unlock(); |
| 4660 | return ret; |
| 4661 | |
| 4662 | case SIOCGIFMEM: |
| 4663 | /* Get the per device memory space. We can add this but |
| 4664 | * currently do not support it */ |
| 4665 | case SIOCSIFMEM: |
| 4666 | /* Set the per device memory buffer space. |
| 4667 | * Not applicable in our case */ |
| 4668 | case SIOCSIFLINK: |
| 4669 | return -EINVAL; |
| 4670 | |
| 4671 | /* |
| 4672 | * Unknown or private ioctl. |
| 4673 | */ |
| 4674 | default: |
| 4675 | if (cmd == SIOCWANDEV || |
| 4676 | (cmd >= SIOCDEVPRIVATE && |
| 4677 | cmd <= SIOCDEVPRIVATE + 15)) { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4678 | dev_load(net, ifr.ifr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4679 | rtnl_lock(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4680 | ret = dev_ifsioc(net, &ifr, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4681 | rtnl_unlock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4682 | if (!ret && copy_to_user(arg, &ifr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4683 | sizeof(struct ifreq))) |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4684 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4685 | return ret; |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4686 | } |
| 4687 | /* Take care of Wireless Extensions */ |
| 4688 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) |
| 4689 | return wext_handle_ioctl(net, &ifr, cmd, arg); |
| 4690 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4691 | } |
| 4692 | } |
| 4693 | |
| 4694 | |
| 4695 | /** |
| 4696 | * dev_new_index - allocate an ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 4697 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4698 | * |
| 4699 | * Returns a suitable unique value for a new device interface |
| 4700 | * number. The caller must hold the rtnl semaphore or the |
| 4701 | * dev_base_lock to be sure it remains unique. |
| 4702 | */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4703 | static int dev_new_index(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4704 | { |
| 4705 | static int ifindex; |
| 4706 | for (;;) { |
| 4707 | if (++ifindex <= 0) |
| 4708 | ifindex = 1; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4709 | if (!__dev_get_by_index(net, ifindex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4710 | return ifindex; |
| 4711 | } |
| 4712 | } |
| 4713 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4714 | /* Delayed registration/unregisteration */ |
Denis Cheng | 3b5b34f | 2007-12-07 00:49:17 -0800 | [diff] [blame] | 4715 | static LIST_HEAD(net_todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4716 | |
Stephen Hemminger | 6f05f62 | 2007-03-08 20:46:03 -0800 | [diff] [blame] | 4717 | static void net_set_todo(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4718 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4719 | list_add_tail(&dev->todo_list, &net_todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4720 | } |
| 4721 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4722 | static void rollback_registered_many(struct list_head *head) |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4723 | { |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4724 | struct net_device *dev; |
| 4725 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4726 | BUG_ON(dev_boot_phase); |
| 4727 | ASSERT_RTNL(); |
| 4728 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4729 | list_for_each_entry(dev, head, unreg_list) { |
| 4730 | /* Some devices call without registering |
| 4731 | * for initialization unwind. |
| 4732 | */ |
| 4733 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
| 4734 | pr_debug("unregister_netdevice: device %s/%p never " |
| 4735 | "was registered\n", dev->name, dev); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4736 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4737 | WARN_ON(1); |
| 4738 | return; |
| 4739 | } |
| 4740 | |
| 4741 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
| 4742 | |
| 4743 | /* If device is running, close it first. */ |
| 4744 | dev_close(dev); |
| 4745 | |
| 4746 | /* And unlink it from device chain. */ |
| 4747 | unlist_netdevice(dev); |
| 4748 | |
| 4749 | dev->reg_state = NETREG_UNREGISTERING; |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4750 | } |
| 4751 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4752 | synchronize_net(); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4753 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4754 | list_for_each_entry(dev, head, unreg_list) { |
| 4755 | /* Shutdown queueing discipline. */ |
| 4756 | dev_shutdown(dev); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4757 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4758 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4759 | /* Notify protocols, that we are about to destroy |
| 4760 | this device. They should clean all the things. |
| 4761 | */ |
| 4762 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
| 4763 | |
| 4764 | /* |
| 4765 | * Flush the unicast and multicast chains |
| 4766 | */ |
| 4767 | dev_unicast_flush(dev); |
| 4768 | dev_addr_discard(dev); |
| 4769 | |
| 4770 | if (dev->netdev_ops->ndo_uninit) |
| 4771 | dev->netdev_ops->ndo_uninit(dev); |
| 4772 | |
| 4773 | /* Notifier chain MUST detach us from master device. */ |
| 4774 | WARN_ON(dev->master); |
| 4775 | |
| 4776 | /* Remove entries from kobject tree */ |
| 4777 | netdev_unregister_kobject(dev); |
| 4778 | } |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4779 | |
| 4780 | synchronize_net(); |
| 4781 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4782 | list_for_each_entry(dev, head, unreg_list) |
| 4783 | dev_put(dev); |
| 4784 | } |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4785 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4786 | static void rollback_registered(struct net_device *dev) |
| 4787 | { |
| 4788 | LIST_HEAD(single); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4789 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4790 | list_add(&dev->unreg_list, &single); |
| 4791 | rollback_registered_many(&single); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4792 | } |
| 4793 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 4794 | static void __netdev_init_queue_locks_one(struct net_device *dev, |
| 4795 | struct netdev_queue *dev_queue, |
| 4796 | void *_unused) |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4797 | { |
| 4798 | spin_lock_init(&dev_queue->_xmit_lock); |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 4799 | netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4800 | dev_queue->xmit_lock_owner = -1; |
| 4801 | } |
| 4802 | |
| 4803 | static void netdev_init_queue_locks(struct net_device *dev) |
| 4804 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 4805 | netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL); |
| 4806 | __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4807 | } |
| 4808 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 4809 | unsigned long netdev_fix_features(unsigned long features, const char *name) |
| 4810 | { |
| 4811 | /* Fix illegal SG+CSUM combinations. */ |
| 4812 | if ((features & NETIF_F_SG) && |
| 4813 | !(features & NETIF_F_ALL_CSUM)) { |
| 4814 | if (name) |
| 4815 | printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no " |
| 4816 | "checksum feature.\n", name); |
| 4817 | features &= ~NETIF_F_SG; |
| 4818 | } |
| 4819 | |
| 4820 | /* TSO requires that SG is present as well. */ |
| 4821 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) { |
| 4822 | if (name) |
| 4823 | printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no " |
| 4824 | "SG feature.\n", name); |
| 4825 | features &= ~NETIF_F_TSO; |
| 4826 | } |
| 4827 | |
| 4828 | if (features & NETIF_F_UFO) { |
| 4829 | if (!(features & NETIF_F_GEN_CSUM)) { |
| 4830 | if (name) |
| 4831 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " |
| 4832 | "since no NETIF_F_HW_CSUM feature.\n", |
| 4833 | name); |
| 4834 | features &= ~NETIF_F_UFO; |
| 4835 | } |
| 4836 | |
| 4837 | if (!(features & NETIF_F_SG)) { |
| 4838 | if (name) |
| 4839 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " |
| 4840 | "since no NETIF_F_SG feature.\n", name); |
| 4841 | features &= ~NETIF_F_UFO; |
| 4842 | } |
| 4843 | } |
| 4844 | |
| 4845 | return features; |
| 4846 | } |
| 4847 | EXPORT_SYMBOL(netdev_fix_features); |
| 4848 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4849 | /** |
| 4850 | * register_netdevice - register a network device |
| 4851 | * @dev: device to register |
| 4852 | * |
| 4853 | * Take a completed network device structure and add it to the kernel |
| 4854 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
| 4855 | * chain. 0 is returned on success. A negative errno code is returned |
| 4856 | * on a failure to set up the device, or if the name is a duplicate. |
| 4857 | * |
| 4858 | * Callers must hold the rtnl semaphore. You may want |
| 4859 | * register_netdev() instead of this. |
| 4860 | * |
| 4861 | * BUGS: |
| 4862 | * The locking appears insufficient to guarantee two parallel registers |
| 4863 | * will not get the same name. |
| 4864 | */ |
| 4865 | |
| 4866 | int register_netdevice(struct net_device *dev) |
| 4867 | { |
| 4868 | struct hlist_head *head; |
| 4869 | struct hlist_node *p; |
| 4870 | int ret; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4871 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4872 | |
| 4873 | BUG_ON(dev_boot_phase); |
| 4874 | ASSERT_RTNL(); |
| 4875 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 4876 | might_sleep(); |
| 4877 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4878 | /* When net_device's are persistent, this will be fatal. */ |
| 4879 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4880 | BUG_ON(!net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4881 | |
David S. Miller | f1f28aa | 2008-07-15 00:08:33 -0700 | [diff] [blame] | 4882 | spin_lock_init(&dev->addr_list_lock); |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 4883 | netdev_set_addr_lockdep_class(dev); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4884 | netdev_init_queue_locks(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4886 | dev->iflink = -1; |
| 4887 | |
| 4888 | /* Init, if this function is available */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4889 | if (dev->netdev_ops->ndo_init) { |
| 4890 | ret = dev->netdev_ops->ndo_init(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4891 | if (ret) { |
| 4892 | if (ret > 0) |
| 4893 | ret = -EIO; |
Adrian Bunk | 90833aa | 2006-11-13 16:02:22 -0800 | [diff] [blame] | 4894 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4895 | } |
| 4896 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 4897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4898 | if (!dev_valid_name(dev->name)) { |
| 4899 | ret = -EINVAL; |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 4900 | goto err_uninit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4901 | } |
| 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 | |
| 4907 | /* Check for existence of name */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4908 | head = dev_name_hash(net, dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4909 | hlist_for_each(p, head) { |
| 4910 | struct net_device *d |
| 4911 | = hlist_entry(p, struct net_device, name_hlist); |
| 4912 | if (!strncmp(d->name, dev->name, IFNAMSIZ)) { |
| 4913 | ret = -EEXIST; |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 4914 | goto err_uninit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4915 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 4916 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4917 | |
Stephen Hemminger | d212f87 | 2007-06-27 00:47:37 -0700 | [diff] [blame] | 4918 | /* Fix illegal checksum combinations */ |
| 4919 | if ((dev->features & NETIF_F_HW_CSUM) && |
| 4920 | (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
| 4921 | printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n", |
| 4922 | dev->name); |
| 4923 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
| 4924 | } |
| 4925 | |
| 4926 | if ((dev->features & NETIF_F_NO_CSUM) && |
| 4927 | (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
| 4928 | printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n", |
| 4929 | dev->name); |
| 4930 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM); |
| 4931 | } |
| 4932 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 4933 | dev->features = netdev_fix_features(dev->features, dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4934 | |
Lennert Buytenhek | e5a4a72 | 2008-08-03 01:23:10 -0700 | [diff] [blame] | 4935 | /* Enable software GSO if SG is supported. */ |
| 4936 | if (dev->features & NETIF_F_SG) |
| 4937 | dev->features |= NETIF_F_GSO; |
| 4938 | |
Daniel Lezcano | aaf8cdc | 2008-05-02 17:00:58 -0700 | [diff] [blame] | 4939 | netdev_initialize_kobject(dev); |
Johannes Berg | 7ffbe3f | 2009-10-02 05:15:27 +0000 | [diff] [blame] | 4940 | |
| 4941 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
| 4942 | ret = notifier_to_errno(ret); |
| 4943 | if (ret) |
| 4944 | goto err_uninit; |
| 4945 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 4946 | ret = netdev_register_kobject(dev); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 4947 | if (ret) |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 4948 | goto err_uninit; |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 4949 | dev->reg_state = NETREG_REGISTERED; |
| 4950 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4951 | /* |
| 4952 | * Default initial state at registry is that the |
| 4953 | * device is present. |
| 4954 | */ |
| 4955 | |
| 4956 | set_bit(__LINK_STATE_PRESENT, &dev->state); |
| 4957 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4958 | dev_init_scheduler(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4959 | dev_hold(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 4960 | list_netdevice(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4961 | |
| 4962 | /* Notify protocols, that a new device appeared. */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4963 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 4964 | ret = notifier_to_errno(ret); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4965 | if (ret) { |
| 4966 | rollback_registered(dev); |
| 4967 | dev->reg_state = NETREG_UNREGISTERED; |
| 4968 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4969 | |
| 4970 | out: |
| 4971 | return ret; |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 4972 | |
| 4973 | err_uninit: |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4974 | if (dev->netdev_ops->ndo_uninit) |
| 4975 | dev->netdev_ops->ndo_uninit(dev); |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 4976 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4977 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4978 | EXPORT_SYMBOL(register_netdevice); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4979 | |
| 4980 | /** |
Benjamin Herrenschmidt | 937f1ba | 2009-01-14 21:05:05 -0800 | [diff] [blame] | 4981 | * init_dummy_netdev - init a dummy network device for NAPI |
| 4982 | * @dev: device to init |
| 4983 | * |
| 4984 | * This takes a network device structure and initialize the minimum |
| 4985 | * amount of fields so it can be used to schedule NAPI polls without |
| 4986 | * registering a full blown interface. This is to be used by drivers |
| 4987 | * that need to tie several hardware interfaces to a single NAPI |
| 4988 | * poll scheduler due to HW limitations. |
| 4989 | */ |
| 4990 | int init_dummy_netdev(struct net_device *dev) |
| 4991 | { |
| 4992 | /* Clear everything. Note we don't initialize spinlocks |
| 4993 | * are they aren't supposed to be taken by any of the |
| 4994 | * NAPI code and this dummy netdev is supposed to be |
| 4995 | * only ever used for NAPI polls |
| 4996 | */ |
| 4997 | memset(dev, 0, sizeof(struct net_device)); |
| 4998 | |
| 4999 | /* make sure we BUG if trying to hit standard |
| 5000 | * register/unregister code path |
| 5001 | */ |
| 5002 | dev->reg_state = NETREG_DUMMY; |
| 5003 | |
| 5004 | /* initialize the ref count */ |
| 5005 | atomic_set(&dev->refcnt, 1); |
| 5006 | |
| 5007 | /* NAPI wants this */ |
| 5008 | INIT_LIST_HEAD(&dev->napi_list); |
| 5009 | |
| 5010 | /* a dummy interface is started by default */ |
| 5011 | set_bit(__LINK_STATE_PRESENT, &dev->state); |
| 5012 | set_bit(__LINK_STATE_START, &dev->state); |
| 5013 | |
| 5014 | return 0; |
| 5015 | } |
| 5016 | EXPORT_SYMBOL_GPL(init_dummy_netdev); |
| 5017 | |
| 5018 | |
| 5019 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5020 | * register_netdev - register a network device |
| 5021 | * @dev: device to register |
| 5022 | * |
| 5023 | * Take a completed network device structure and add it to the kernel |
| 5024 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
| 5025 | * chain. 0 is returned on success. A negative errno code is returned |
| 5026 | * on a failure to set up the device, or if the name is a duplicate. |
| 5027 | * |
Borislav Petkov | 38b4da3 | 2007-04-20 22:14:10 -0700 | [diff] [blame] | 5028 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5029 | * and expands the device name if you passed a format string to |
| 5030 | * alloc_netdev. |
| 5031 | */ |
| 5032 | int register_netdev(struct net_device *dev) |
| 5033 | { |
| 5034 | int err; |
| 5035 | |
| 5036 | rtnl_lock(); |
| 5037 | |
| 5038 | /* |
| 5039 | * If the name is a format string the caller wants us to do a |
| 5040 | * name allocation. |
| 5041 | */ |
| 5042 | if (strchr(dev->name, '%')) { |
| 5043 | err = dev_alloc_name(dev, dev->name); |
| 5044 | if (err < 0) |
| 5045 | goto out; |
| 5046 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5047 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5048 | err = register_netdevice(dev); |
| 5049 | out: |
| 5050 | rtnl_unlock(); |
| 5051 | return err; |
| 5052 | } |
| 5053 | EXPORT_SYMBOL(register_netdev); |
| 5054 | |
| 5055 | /* |
| 5056 | * netdev_wait_allrefs - wait until all references are gone. |
| 5057 | * |
| 5058 | * This is called when unregistering network devices. |
| 5059 | * |
| 5060 | * Any protocol or device that holds a reference should register |
| 5061 | * for netdevice notification, and cleanup and put back the |
| 5062 | * reference if they receive an UNREGISTER event. |
| 5063 | * We can get stuck here if buggy protocols don't correctly |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5064 | * call dev_put. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5065 | */ |
| 5066 | static void netdev_wait_allrefs(struct net_device *dev) |
| 5067 | { |
| 5068 | unsigned long rebroadcast_time, warning_time; |
| 5069 | |
| 5070 | rebroadcast_time = warning_time = jiffies; |
| 5071 | while (atomic_read(&dev->refcnt) != 0) { |
| 5072 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5073 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5074 | |
| 5075 | /* Rebroadcast unregister notification */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 5076 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
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 |
| 5141 | = list_entry(list.next, struct net_device, todo_list); |
| 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 | |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 5153 | on_each_cpu(flush_backlog, dev, 1); |
| 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5249 | |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 5250 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
| 5251 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 5252 | alloc_size = sizeof(struct net_device); |
Alexey Dobriyan | d1643d2 | 2008-04-18 15:43:32 -0700 | [diff] [blame] | 5253 | if (sizeof_priv) { |
| 5254 | /* ensure 32-byte alignment of private area */ |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5255 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
Alexey Dobriyan | d1643d2 | 2008-04-18 15:43:32 -0700 | [diff] [blame] | 5256 | alloc_size += sizeof_priv; |
| 5257 | } |
| 5258 | /* ensure 32-byte alignment of whole construct */ |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5259 | alloc_size += NETDEV_ALIGN - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5260 | |
Paolo 'Blaisorblade' Giarrusso | 31380de | 2006-04-06 22:38:28 -0700 | [diff] [blame] | 5261 | p = kzalloc(alloc_size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5262 | if (!p) { |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 5263 | printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5264 | return NULL; |
| 5265 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5266 | |
Stephen Hemminger | 7943986 | 2008-07-21 13:28:44 -0700 | [diff] [blame] | 5267 | tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5268 | if (!tx) { |
| 5269 | printk(KERN_ERR "alloc_netdev: Unable to allocate " |
| 5270 | "tx qdiscs.\n"); |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5271 | goto free_p; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5272 | } |
| 5273 | |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5274 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5275 | dev->padded = (char *)dev - (char *)p; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5276 | |
| 5277 | if (dev_addr_init(dev)) |
| 5278 | goto free_tx; |
| 5279 | |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 5280 | dev_unicast_init(dev); |
| 5281 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 5282 | dev_net_set(dev, &init_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5283 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5284 | dev->_tx = tx; |
| 5285 | dev->num_tx_queues = queue_count; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 5286 | dev->real_num_tx_queues = queue_count; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5287 | |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 5288 | dev->gso_max_size = GSO_MAX_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5289 | |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 5290 | netdev_init_queues(dev); |
| 5291 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5292 | INIT_LIST_HEAD(&dev->napi_list); |
Eric W. Biederman | 9fdce09 | 2009-10-30 14:51:13 +0000 | [diff] [blame] | 5293 | INIT_LIST_HEAD(&dev->unreg_list); |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 5294 | dev->priv_flags = IFF_XMIT_DST_RELEASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5295 | setup(dev); |
| 5296 | strcpy(dev->name, name); |
| 5297 | return dev; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5298 | |
| 5299 | free_tx: |
| 5300 | kfree(tx); |
| 5301 | |
| 5302 | free_p: |
| 5303 | kfree(p); |
| 5304 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5305 | } |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 5306 | EXPORT_SYMBOL(alloc_netdev_mq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5307 | |
| 5308 | /** |
| 5309 | * free_netdev - free network device |
| 5310 | * @dev: device |
| 5311 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5312 | * This function does the last stage of destroying an allocated device |
| 5313 | * interface. The reference to the device object is released. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5314 | * If this is the last reference then it will be freed. |
| 5315 | */ |
| 5316 | void free_netdev(struct net_device *dev) |
| 5317 | { |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5318 | struct napi_struct *p, *n; |
| 5319 | |
Denis V. Lunev | f3005d7 | 2008-04-16 02:02:18 -0700 | [diff] [blame] | 5320 | release_net(dev_net(dev)); |
| 5321 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5322 | kfree(dev->_tx); |
| 5323 | |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 5324 | /* Flush device addresses */ |
| 5325 | dev_addr_flush(dev); |
| 5326 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5327 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
| 5328 | netif_napi_del(p); |
| 5329 | |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 5330 | /* Compatibility with error handling in drivers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5331 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
| 5332 | kfree((char *)dev - dev->padded); |
| 5333 | return; |
| 5334 | } |
| 5335 | |
| 5336 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); |
| 5337 | dev->reg_state = NETREG_RELEASED; |
| 5338 | |
Greg Kroah-Hartman | 43cb76d | 2002-04-09 12:14:34 -0700 | [diff] [blame] | 5339 | /* will free via device release */ |
| 5340 | put_device(&dev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5341 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5342 | EXPORT_SYMBOL(free_netdev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5343 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 5344 | /** |
| 5345 | * synchronize_net - Synchronize with packet receive processing |
| 5346 | * |
| 5347 | * Wait for packets currently being received to be done. |
| 5348 | * Does not block later packets from starting. |
| 5349 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5350 | void synchronize_net(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5351 | { |
| 5352 | might_sleep(); |
Paul E. McKenney | fbd568a3e | 2005-05-01 08:59:04 -0700 | [diff] [blame] | 5353 | synchronize_rcu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5354 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5355 | EXPORT_SYMBOL(synchronize_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5356 | |
| 5357 | /** |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5358 | * unregister_netdevice_queue - remove device from the kernel |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5359 | * @dev: device |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5360 | * @head: list |
| 5361 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5362 | * This function shuts down a device interface and removes it |
Wang Chen | d59b54b | 2007-12-11 02:28:03 -0800 | [diff] [blame] | 5363 | * from the kernel tables. |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5364 | * If head not NULL, device is queued to be unregistered later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5365 | * |
| 5366 | * Callers must hold the rtnl semaphore. You may want |
| 5367 | * unregister_netdev() instead of this. |
| 5368 | */ |
| 5369 | |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5370 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5371 | { |
Herbert Xu | a662071 | 2007-12-12 19:21:56 -0800 | [diff] [blame] | 5372 | ASSERT_RTNL(); |
| 5373 | |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5374 | if (head) { |
Eric W. Biederman | 9fdce09 | 2009-10-30 14:51:13 +0000 | [diff] [blame] | 5375 | list_move_tail(&dev->unreg_list, head); |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5376 | } else { |
| 5377 | rollback_registered(dev); |
| 5378 | /* Finish processing unregister after unlock */ |
| 5379 | net_set_todo(dev); |
| 5380 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5381 | } |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5382 | EXPORT_SYMBOL(unregister_netdevice_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5383 | |
| 5384 | /** |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5385 | * unregister_netdevice_many - unregister many devices |
| 5386 | * @head: list of devices |
| 5387 | * |
| 5388 | */ |
| 5389 | void unregister_netdevice_many(struct list_head *head) |
| 5390 | { |
| 5391 | struct net_device *dev; |
| 5392 | |
| 5393 | if (!list_empty(head)) { |
| 5394 | rollback_registered_many(head); |
| 5395 | list_for_each_entry(dev, head, unreg_list) |
| 5396 | net_set_todo(dev); |
| 5397 | } |
| 5398 | } |
Eric Dumazet | 63c8099 | 2009-10-27 07:06:49 +0000 | [diff] [blame] | 5399 | EXPORT_SYMBOL(unregister_netdevice_many); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5400 | |
| 5401 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5402 | * unregister_netdev - remove device from the kernel |
| 5403 | * @dev: device |
| 5404 | * |
| 5405 | * This function shuts down a device interface and removes it |
Wang Chen | d59b54b | 2007-12-11 02:28:03 -0800 | [diff] [blame] | 5406 | * from the kernel tables. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5407 | * |
| 5408 | * This is just a wrapper for unregister_netdevice that takes |
| 5409 | * the rtnl semaphore. In general you want to use this and not |
| 5410 | * unregister_netdevice. |
| 5411 | */ |
| 5412 | void unregister_netdev(struct net_device *dev) |
| 5413 | { |
| 5414 | rtnl_lock(); |
| 5415 | unregister_netdevice(dev); |
| 5416 | rtnl_unlock(); |
| 5417 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5418 | EXPORT_SYMBOL(unregister_netdev); |
| 5419 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5420 | /** |
| 5421 | * dev_change_net_namespace - move device to different nethost namespace |
| 5422 | * @dev: device |
| 5423 | * @net: network namespace |
| 5424 | * @pat: If not NULL name pattern to try if the current device name |
| 5425 | * is already taken in the destination network namespace. |
| 5426 | * |
| 5427 | * This function shuts down a device interface and moves it |
| 5428 | * to a new network namespace. On success 0 is returned, on |
| 5429 | * a failure a netagive errno code is returned. |
| 5430 | * |
| 5431 | * Callers must hold the rtnl semaphore. |
| 5432 | */ |
| 5433 | |
| 5434 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) |
| 5435 | { |
| 5436 | char buf[IFNAMSIZ]; |
| 5437 | const char *destname; |
| 5438 | int err; |
| 5439 | |
| 5440 | ASSERT_RTNL(); |
| 5441 | |
| 5442 | /* Don't allow namespace local devices to be moved. */ |
| 5443 | err = -EINVAL; |
| 5444 | if (dev->features & NETIF_F_NETNS_LOCAL) |
| 5445 | goto out; |
| 5446 | |
Eric W. Biederman | 3891845 | 2008-10-27 17:51:47 -0700 | [diff] [blame] | 5447 | #ifdef CONFIG_SYSFS |
| 5448 | /* Don't allow real devices to be moved when sysfs |
| 5449 | * is enabled. |
| 5450 | */ |
| 5451 | err = -EINVAL; |
| 5452 | if (dev->dev.parent) |
| 5453 | goto out; |
| 5454 | #endif |
| 5455 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5456 | /* Ensure the device has been registrered */ |
| 5457 | err = -EINVAL; |
| 5458 | if (dev->reg_state != NETREG_REGISTERED) |
| 5459 | goto out; |
| 5460 | |
| 5461 | /* Get out if there is nothing todo */ |
| 5462 | err = 0; |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 5463 | if (net_eq(dev_net(dev), net)) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5464 | goto out; |
| 5465 | |
| 5466 | /* Pick the destination device name, and ensure |
| 5467 | * we can use it in the destination network namespace. |
| 5468 | */ |
| 5469 | err = -EEXIST; |
| 5470 | destname = dev->name; |
| 5471 | if (__dev_get_by_name(net, destname)) { |
| 5472 | /* We get here if we can't use the current device name */ |
| 5473 | if (!pat) |
| 5474 | goto out; |
| 5475 | if (!dev_valid_name(pat)) |
| 5476 | goto out; |
| 5477 | if (strchr(pat, '%')) { |
| 5478 | if (__dev_alloc_name(net, pat, buf) < 0) |
| 5479 | goto out; |
| 5480 | destname = buf; |
| 5481 | } else |
| 5482 | destname = pat; |
| 5483 | if (__dev_get_by_name(net, destname)) |
| 5484 | goto out; |
| 5485 | } |
| 5486 | |
| 5487 | /* |
| 5488 | * And now a mini version of register_netdevice unregister_netdevice. |
| 5489 | */ |
| 5490 | |
| 5491 | /* If device is running close it first. */ |
Pavel Emelyanov | 9b77265 | 2007-10-10 02:49:09 -0700 | [diff] [blame] | 5492 | dev_close(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5493 | |
| 5494 | /* And unlink it from device chain */ |
| 5495 | err = -ENODEV; |
| 5496 | unlist_netdevice(dev); |
| 5497 | |
| 5498 | synchronize_net(); |
| 5499 | |
| 5500 | /* Shutdown queueing discipline. */ |
| 5501 | dev_shutdown(dev); |
| 5502 | |
| 5503 | /* Notify protocols, that we are about to destroy |
| 5504 | this device. They should clean all the things. |
| 5505 | */ |
| 5506 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
| 5507 | |
| 5508 | /* |
| 5509 | * Flush the unicast and multicast chains |
| 5510 | */ |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 5511 | dev_unicast_flush(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5512 | dev_addr_discard(dev); |
| 5513 | |
Eric W. Biederman | 3891845 | 2008-10-27 17:51:47 -0700 | [diff] [blame] | 5514 | netdev_unregister_kobject(dev); |
| 5515 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5516 | /* Actually switch the network namespace */ |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 5517 | dev_net_set(dev, net); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5518 | |
| 5519 | /* Assign the new device name */ |
| 5520 | if (destname != dev->name) |
| 5521 | strcpy(dev->name, destname); |
| 5522 | |
| 5523 | /* If there is an ifindex conflict assign a new one */ |
| 5524 | if (__dev_get_by_index(net, dev->ifindex)) { |
| 5525 | int iflink = (dev->iflink == dev->ifindex); |
| 5526 | dev->ifindex = dev_new_index(net); |
| 5527 | if (iflink) |
| 5528 | dev->iflink = dev->ifindex; |
| 5529 | } |
| 5530 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5531 | /* Fixup kobjects */ |
Daniel Lezcano | aaf8cdc | 2008-05-02 17:00:58 -0700 | [diff] [blame] | 5532 | err = netdev_register_kobject(dev); |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5533 | WARN_ON(err); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5534 | |
| 5535 | /* Add the device back in the hashes */ |
| 5536 | list_netdevice(dev); |
| 5537 | |
| 5538 | /* Notify protocols, that a new device appeared. */ |
| 5539 | call_netdevice_notifiers(NETDEV_REGISTER, dev); |
| 5540 | |
| 5541 | synchronize_net(); |
| 5542 | err = 0; |
| 5543 | out: |
| 5544 | return err; |
| 5545 | } |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 5546 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5548 | static int dev_cpu_callback(struct notifier_block *nfb, |
| 5549 | unsigned long action, |
| 5550 | void *ocpu) |
| 5551 | { |
| 5552 | struct sk_buff **list_skb; |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 5553 | struct Qdisc **list_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5554 | struct sk_buff *skb; |
| 5555 | unsigned int cpu, oldcpu = (unsigned long)ocpu; |
| 5556 | struct softnet_data *sd, *oldsd; |
| 5557 | |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 5558 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5559 | return NOTIFY_OK; |
| 5560 | |
| 5561 | local_irq_disable(); |
| 5562 | cpu = smp_processor_id(); |
| 5563 | sd = &per_cpu(softnet_data, cpu); |
| 5564 | oldsd = &per_cpu(softnet_data, oldcpu); |
| 5565 | |
| 5566 | /* Find end of our completion_queue. */ |
| 5567 | list_skb = &sd->completion_queue; |
| 5568 | while (*list_skb) |
| 5569 | list_skb = &(*list_skb)->next; |
| 5570 | /* Append completion queue from offline CPU. */ |
| 5571 | *list_skb = oldsd->completion_queue; |
| 5572 | oldsd->completion_queue = NULL; |
| 5573 | |
| 5574 | /* Find end of our output_queue. */ |
| 5575 | list_net = &sd->output_queue; |
| 5576 | while (*list_net) |
| 5577 | list_net = &(*list_net)->next_sched; |
| 5578 | /* Append output queue from offline CPU. */ |
| 5579 | *list_net = oldsd->output_queue; |
| 5580 | oldsd->output_queue = NULL; |
| 5581 | |
| 5582 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 5583 | local_irq_enable(); |
| 5584 | |
| 5585 | /* Process offline CPU's input_pkt_queue */ |
| 5586 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) |
| 5587 | netif_rx(skb); |
| 5588 | |
| 5589 | return NOTIFY_OK; |
| 5590 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5591 | |
| 5592 | |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5593 | /** |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5594 | * netdev_increment_features - increment feature set by one |
| 5595 | * @all: current feature set |
| 5596 | * @one: new feature set |
| 5597 | * @mask: mask feature set |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5598 | * |
| 5599 | * Computes a new feature set after adding a device with feature set |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5600 | * @one to the master device with current feature set @all. Will not |
| 5601 | * enable anything that is off in @mask. Returns the new feature set. |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5602 | */ |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5603 | unsigned long netdev_increment_features(unsigned long all, unsigned long one, |
| 5604 | unsigned long mask) |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5605 | { |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5606 | /* If device needs checksumming, downgrade to it. */ |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5607 | if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM)) |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5608 | all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM); |
| 5609 | else if (mask & NETIF_F_ALL_CSUM) { |
| 5610 | /* If one device supports v4/v6 checksumming, set for all. */ |
| 5611 | if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) && |
| 5612 | !(all & NETIF_F_GEN_CSUM)) { |
| 5613 | all &= ~NETIF_F_ALL_CSUM; |
| 5614 | all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); |
| 5615 | } |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5616 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5617 | /* If one device supports hw checksumming, set for all. */ |
| 5618 | if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) { |
| 5619 | all &= ~NETIF_F_ALL_CSUM; |
| 5620 | all |= NETIF_F_HW_CSUM; |
| 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 | one |= NETIF_F_ALL_CSUM; |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5625 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5626 | one |= all & NETIF_F_ONE_FOR_ALL; |
Sridhar Samudrala | d9f5950 | 2009-10-07 12:24:25 +0000 | [diff] [blame] | 5627 | all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO; |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5628 | all |= one & mask & NETIF_F_ONE_FOR_ALL; |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5629 | |
| 5630 | return all; |
| 5631 | } |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5632 | EXPORT_SYMBOL(netdev_increment_features); |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5633 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5634 | static struct hlist_head *netdev_create_hash(void) |
| 5635 | { |
| 5636 | int i; |
| 5637 | struct hlist_head *hash; |
| 5638 | |
| 5639 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); |
| 5640 | if (hash != NULL) |
| 5641 | for (i = 0; i < NETDEV_HASHENTRIES; i++) |
| 5642 | INIT_HLIST_HEAD(&hash[i]); |
| 5643 | |
| 5644 | return hash; |
| 5645 | } |
| 5646 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5647 | /* Initialize per network namespace state */ |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 5648 | static int __net_init netdev_init(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5649 | { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5650 | INIT_LIST_HEAD(&net->dev_base_head); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5651 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5652 | net->dev_name_head = netdev_create_hash(); |
| 5653 | if (net->dev_name_head == NULL) |
| 5654 | goto err_name; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5655 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5656 | net->dev_index_head = netdev_create_hash(); |
| 5657 | if (net->dev_index_head == NULL) |
| 5658 | goto err_idx; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5659 | |
| 5660 | return 0; |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5661 | |
| 5662 | err_idx: |
| 5663 | kfree(net->dev_name_head); |
| 5664 | err_name: |
| 5665 | return -ENOMEM; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5666 | } |
| 5667 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 5668 | /** |
| 5669 | * netdev_drivername - network driver for the device |
| 5670 | * @dev: network device |
| 5671 | * @buffer: buffer for resulting name |
| 5672 | * @len: size of buffer |
| 5673 | * |
| 5674 | * Determine network driver for device. |
| 5675 | */ |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 5676 | 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] | 5677 | { |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 5678 | const struct device_driver *driver; |
| 5679 | const struct device *parent; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 5680 | |
| 5681 | if (len <= 0 || !buffer) |
| 5682 | return buffer; |
| 5683 | buffer[0] = 0; |
| 5684 | |
| 5685 | parent = dev->dev.parent; |
| 5686 | |
| 5687 | if (!parent) |
| 5688 | return buffer; |
| 5689 | |
| 5690 | driver = parent->driver; |
| 5691 | if (driver && driver->name) |
| 5692 | strlcpy(buffer, driver->name, len); |
| 5693 | return buffer; |
| 5694 | } |
| 5695 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 5696 | static void __net_exit netdev_exit(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5697 | { |
| 5698 | kfree(net->dev_name_head); |
| 5699 | kfree(net->dev_index_head); |
| 5700 | } |
| 5701 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 5702 | static struct pernet_operations __net_initdata netdev_net_ops = { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5703 | .init = netdev_init, |
| 5704 | .exit = netdev_exit, |
| 5705 | }; |
| 5706 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 5707 | static void __net_exit default_device_exit(struct net *net) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5708 | { |
Eric W. Biederman | 8eb7986 | 2008-12-29 18:21:48 -0800 | [diff] [blame] | 5709 | struct net_device *dev; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5710 | /* |
| 5711 | * Push all migratable of the network devices back to the |
| 5712 | * initial network namespace |
| 5713 | */ |
| 5714 | rtnl_lock(); |
Eric W. Biederman | 8eb7986 | 2008-12-29 18:21:48 -0800 | [diff] [blame] | 5715 | restart: |
| 5716 | for_each_netdev(net, dev) { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5717 | int err; |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5718 | char fb_name[IFNAMSIZ]; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5719 | |
| 5720 | /* Ignore unmoveable devices (i.e. loopback) */ |
| 5721 | if (dev->features & NETIF_F_NETNS_LOCAL) |
| 5722 | continue; |
| 5723 | |
Eric W. Biederman | d0c082c | 2008-11-05 15:59:38 -0800 | [diff] [blame] | 5724 | /* Delete virtual devices */ |
| 5725 | if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) { |
Eric Dumazet | 23289a3 | 2009-10-27 07:06:36 +0000 | [diff] [blame] | 5726 | dev->rtnl_link_ops->dellink(dev, NULL); |
Eric W. Biederman | 8eb7986 | 2008-12-29 18:21:48 -0800 | [diff] [blame] | 5727 | goto restart; |
Eric W. Biederman | d0c082c | 2008-11-05 15:59:38 -0800 | [diff] [blame] | 5728 | } |
| 5729 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5730 | /* Push remaing network devices to init_net */ |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5731 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
| 5732 | err = dev_change_net_namespace(dev, &init_net, fb_name); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5733 | if (err) { |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5734 | 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] | 5735 | __func__, dev->name, err); |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5736 | BUG(); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5737 | } |
Eric W. Biederman | 8eb7986 | 2008-12-29 18:21:48 -0800 | [diff] [blame] | 5738 | goto restart; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5739 | } |
| 5740 | rtnl_unlock(); |
| 5741 | } |
| 5742 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 5743 | static struct pernet_operations __net_initdata default_device_ops = { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5744 | .exit = default_device_exit, |
| 5745 | }; |
| 5746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5747 | /* |
| 5748 | * Initialize the DEV module. At boot time this walks the device list and |
| 5749 | * unhooks any devices that fail to initialise (normally hardware not |
| 5750 | * present) and leaves us with a valid list of present and active devices. |
| 5751 | * |
| 5752 | */ |
| 5753 | |
| 5754 | /* |
| 5755 | * This is called single threaded during boot, so no need |
| 5756 | * to take the rtnl semaphore. |
| 5757 | */ |
| 5758 | static int __init net_dev_init(void) |
| 5759 | { |
| 5760 | int i, rc = -ENOMEM; |
| 5761 | |
| 5762 | BUG_ON(!dev_boot_phase); |
| 5763 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5764 | if (dev_proc_init()) |
| 5765 | goto out; |
| 5766 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5767 | if (netdev_kobject_init()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5768 | goto out; |
| 5769 | |
| 5770 | INIT_LIST_HEAD(&ptype_all); |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 5771 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5772 | INIT_LIST_HEAD(&ptype_base[i]); |
| 5773 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5774 | if (register_pernet_subsys(&netdev_net_ops)) |
| 5775 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5776 | |
| 5777 | /* |
| 5778 | * Initialise the packet receive queues. |
| 5779 | */ |
| 5780 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 5781 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5782 | struct softnet_data *queue; |
| 5783 | |
| 5784 | queue = &per_cpu(softnet_data, i); |
| 5785 | skb_queue_head_init(&queue->input_pkt_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5786 | queue->completion_queue = NULL; |
| 5787 | INIT_LIST_HEAD(&queue->poll_list); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 5788 | |
| 5789 | queue->backlog.poll = process_backlog; |
| 5790 | queue->backlog.weight = weight_p; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5791 | queue->backlog.gro_list = NULL; |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 5792 | queue->backlog.gro_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5793 | } |
| 5794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5795 | dev_boot_phase = 0; |
| 5796 | |
Eric W. Biederman | 505d4f7 | 2008-11-07 22:54:20 -0800 | [diff] [blame] | 5797 | /* The loopback device is special if any other network devices |
| 5798 | * is present in a network namespace the loopback device must |
| 5799 | * be present. Since we now dynamically allocate and free the |
| 5800 | * loopback device ensure this invariant is maintained by |
| 5801 | * keeping the loopback device as the first device on the |
| 5802 | * list of network devices. Ensuring the loopback devices |
| 5803 | * is the first device that appears and the last network device |
| 5804 | * that disappears. |
| 5805 | */ |
| 5806 | if (register_pernet_device(&loopback_net_ops)) |
| 5807 | goto out; |
| 5808 | |
| 5809 | if (register_pernet_device(&default_device_ops)) |
| 5810 | goto out; |
| 5811 | |
Carlos R. Mafra | 962cf36 | 2008-05-15 11:15:37 -0300 | [diff] [blame] | 5812 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
| 5813 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5814 | |
| 5815 | hotcpu_notifier(dev_cpu_callback, 0); |
| 5816 | dst_init(); |
| 5817 | dev_mcast_init(); |
| 5818 | rc = 0; |
| 5819 | out: |
| 5820 | return rc; |
| 5821 | } |
| 5822 | |
| 5823 | subsys_initcall(net_dev_init); |
| 5824 | |
Krishna Kumar | e88721f | 2009-02-18 17:55:02 -0800 | [diff] [blame] | 5825 | static int __init initialize_hashrnd(void) |
| 5826 | { |
| 5827 | get_random_bytes(&skb_tx_hashrnd, sizeof(skb_tx_hashrnd)); |
| 5828 | return 0; |
| 5829 | } |
| 5830 | |
| 5831 | late_initcall_sync(initialize_hashrnd); |
| 5832 | |