Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NETLINK Kernel-user communication protocol. |
| 3 | * |
Alan Cox | 113aa83 | 2008-10-13 19:01:08 -0700 | [diff] [blame] | 4 | * Authors: Alan Cox <alan@lxorguk.ukuu.org.uk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 6 | * Patrick McHardy <kaber@trash.net> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * Tue Jun 26 14:36:48 MEST 2001 Herbert "herp" Rosmanith |
| 14 | * added netlink_proto_exit |
| 15 | * Tue Jan 22 18:32:44 BRST 2002 Arnaldo C. de Melo <acme@conectiva.com.br> |
| 16 | * use nlk_sk, as sk->protinfo is on a diet 8) |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 17 | * Fri Jul 22 19:51:12 MEST 2005 Harald Welte <laforge@gnumonks.org> |
| 18 | * - inc module use count of module that owns |
| 19 | * the kernel socket in case userspace opens |
| 20 | * socket of same protocol |
| 21 | * - remove all module support, since netlink is |
| 22 | * mandatory if CONFIG_NET=y these days |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | */ |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/module.h> |
| 26 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 27 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/kernel.h> |
| 29 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/signal.h> |
| 31 | #include <linux/sched.h> |
| 32 | #include <linux/errno.h> |
| 33 | #include <linux/string.h> |
| 34 | #include <linux/stat.h> |
| 35 | #include <linux/socket.h> |
| 36 | #include <linux/un.h> |
| 37 | #include <linux/fcntl.h> |
| 38 | #include <linux/termios.h> |
| 39 | #include <linux/sockios.h> |
| 40 | #include <linux/net.h> |
| 41 | #include <linux/fs.h> |
| 42 | #include <linux/slab.h> |
| 43 | #include <asm/uaccess.h> |
| 44 | #include <linux/skbuff.h> |
| 45 | #include <linux/netdevice.h> |
| 46 | #include <linux/rtnetlink.h> |
| 47 | #include <linux/proc_fs.h> |
| 48 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/notifier.h> |
| 50 | #include <linux/security.h> |
| 51 | #include <linux/jhash.h> |
| 52 | #include <linux/jiffies.h> |
| 53 | #include <linux/random.h> |
| 54 | #include <linux/bitops.h> |
| 55 | #include <linux/mm.h> |
| 56 | #include <linux/types.h> |
Andrew Morton | 54e0f52 | 2005-04-30 07:07:04 +0100 | [diff] [blame] | 57 | #include <linux/audit.h> |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 58 | #include <linux/mutex.h> |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 59 | #include <linux/vmalloc.h> |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 60 | #include <linux/if_arp.h> |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 61 | #include <linux/rhashtable.h> |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 62 | #include <asm/cacheflush.h> |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 63 | #include <linux/hash.h> |
Andrew Morton | 54e0f52 | 2005-04-30 07:07:04 +0100 | [diff] [blame] | 64 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 65 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #include <net/sock.h> |
| 67 | #include <net/scm.h> |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 68 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 70 | #include "af_netlink.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 72 | struct listeners { |
| 73 | struct rcu_head rcu; |
| 74 | unsigned long masks[0]; |
Johannes Berg | 6c04bb1 | 2009-07-10 09:51:32 +0000 | [diff] [blame] | 75 | }; |
| 76 | |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 77 | /* state bits */ |
| 78 | #define NETLINK_CONGESTED 0x0 |
| 79 | |
| 80 | /* flags */ |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 81 | #define NETLINK_KERNEL_SOCKET 0x1 |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 82 | #define NETLINK_RECV_PKTINFO 0x2 |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 83 | #define NETLINK_BROADCAST_SEND_ERROR 0x4 |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 84 | #define NETLINK_RECV_NO_ENOBUFS 0x8 |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 85 | |
David S. Miller | 035c4c1 | 2011-12-23 17:33:03 -0500 | [diff] [blame] | 86 | static inline int netlink_is_kernel(struct sock *sk) |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 87 | { |
| 88 | return nlk_sk(sk)->flags & NETLINK_KERNEL_SOCKET; |
| 89 | } |
| 90 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 91 | struct netlink_table *nl_table; |
| 92 | EXPORT_SYMBOL_GPL(nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
| 94 | static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait); |
| 95 | |
| 96 | static int netlink_dump(struct sock *sk); |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 97 | static void netlink_skb_destructor(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 99 | /* nl_table locking explained: |
| 100 | * Lookup and traversal are protected with nl_sk_hash_lock or nl_table_lock |
| 101 | * combined with an RCU read-side lock. Insertion and removal are protected |
| 102 | * with nl_sk_hash_lock while using RCU list modification primitives and may |
| 103 | * run in parallel to nl_table_lock protected lookups. Destruction of the |
| 104 | * Netlink socket may only occur *after* nl_table_lock has been acquired |
| 105 | * either during or after the socket has been removed from the list. |
| 106 | */ |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 107 | DEFINE_RWLOCK(nl_table_lock); |
| 108 | EXPORT_SYMBOL_GPL(nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | static atomic_t nl_table_users = ATOMIC_INIT(0); |
| 110 | |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 111 | #define nl_deref_protected(X) rcu_dereference_protected(X, lockdep_is_held(&nl_table_lock)); |
| 112 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 113 | /* Protects netlink socket hash table mutations */ |
| 114 | DEFINE_MUTEX(nl_sk_hash_lock); |
Thomas Graf | 6c8f7e7 | 2014-08-07 00:18:47 +0100 | [diff] [blame] | 115 | EXPORT_SYMBOL_GPL(nl_sk_hash_lock); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 116 | |
Herbert Xu | 9712756 | 2014-11-13 18:11:18 +0800 | [diff] [blame] | 117 | #ifdef CONFIG_PROVE_LOCKING |
Herbert Xu | 7b4ce23 | 2014-11-13 18:11:22 +0800 | [diff] [blame] | 118 | static int lockdep_nl_sk_hash_is_held(void *parent) |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 119 | { |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 120 | if (debug_locks) |
| 121 | return lockdep_is_held(&nl_sk_hash_lock) || lockdep_is_held(&nl_table_lock); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 122 | return 1; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 123 | } |
Herbert Xu | 9712756 | 2014-11-13 18:11:18 +0800 | [diff] [blame] | 124 | #endif |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 125 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 126 | static ATOMIC_NOTIFIER_HEAD(netlink_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 128 | static DEFINE_SPINLOCK(netlink_tap_lock); |
| 129 | static struct list_head netlink_tap_all __read_mostly; |
| 130 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 131 | static inline u32 netlink_group_mask(u32 group) |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 132 | { |
| 133 | return group ? 1 << (group - 1) : 0; |
| 134 | } |
| 135 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 136 | int netlink_add_tap(struct netlink_tap *nt) |
| 137 | { |
| 138 | if (unlikely(nt->dev->type != ARPHRD_NETLINK)) |
| 139 | return -EINVAL; |
| 140 | |
| 141 | spin_lock(&netlink_tap_lock); |
| 142 | list_add_rcu(&nt->list, &netlink_tap_all); |
| 143 | spin_unlock(&netlink_tap_lock); |
| 144 | |
Markus Elfring | fcd4d35 | 2014-11-18 21:03:13 +0100 | [diff] [blame] | 145 | __module_get(nt->module); |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | EXPORT_SYMBOL_GPL(netlink_add_tap); |
| 150 | |
stephen hemminger | 2173f8d | 2013-12-30 10:49:22 -0800 | [diff] [blame] | 151 | static int __netlink_remove_tap(struct netlink_tap *nt) |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 152 | { |
| 153 | bool found = false; |
| 154 | struct netlink_tap *tmp; |
| 155 | |
| 156 | spin_lock(&netlink_tap_lock); |
| 157 | |
| 158 | list_for_each_entry(tmp, &netlink_tap_all, list) { |
| 159 | if (nt == tmp) { |
| 160 | list_del_rcu(&nt->list); |
| 161 | found = true; |
| 162 | goto out; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | pr_warn("__netlink_remove_tap: %p not found\n", nt); |
| 167 | out: |
| 168 | spin_unlock(&netlink_tap_lock); |
| 169 | |
| 170 | if (found && nt->module) |
| 171 | module_put(nt->module); |
| 172 | |
| 173 | return found ? 0 : -ENODEV; |
| 174 | } |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 175 | |
| 176 | int netlink_remove_tap(struct netlink_tap *nt) |
| 177 | { |
| 178 | int ret; |
| 179 | |
| 180 | ret = __netlink_remove_tap(nt); |
| 181 | synchronize_net(); |
| 182 | |
| 183 | return ret; |
| 184 | } |
| 185 | EXPORT_SYMBOL_GPL(netlink_remove_tap); |
| 186 | |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 187 | static bool netlink_filter_tap(const struct sk_buff *skb) |
| 188 | { |
| 189 | struct sock *sk = skb->sk; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 190 | |
| 191 | /* We take the more conservative approach and |
| 192 | * whitelist socket protocols that may pass. |
| 193 | */ |
| 194 | switch (sk->sk_protocol) { |
| 195 | case NETLINK_ROUTE: |
| 196 | case NETLINK_USERSOCK: |
| 197 | case NETLINK_SOCK_DIAG: |
| 198 | case NETLINK_NFLOG: |
| 199 | case NETLINK_XFRM: |
| 200 | case NETLINK_FIB_LOOKUP: |
| 201 | case NETLINK_NETFILTER: |
| 202 | case NETLINK_GENERIC: |
Varka Bhadram | 498044b | 2014-07-16 10:59:47 +0530 | [diff] [blame] | 203 | return true; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 204 | } |
| 205 | |
Varka Bhadram | 498044b | 2014-07-16 10:59:47 +0530 | [diff] [blame] | 206 | return false; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 207 | } |
| 208 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 209 | static int __netlink_deliver_tap_skb(struct sk_buff *skb, |
| 210 | struct net_device *dev) |
| 211 | { |
| 212 | struct sk_buff *nskb; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 213 | struct sock *sk = skb->sk; |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 214 | int ret = -ENOMEM; |
| 215 | |
| 216 | dev_hold(dev); |
| 217 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 218 | if (nskb) { |
| 219 | nskb->dev = dev; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 220 | nskb->protocol = htons((u16) sk->sk_protocol); |
Daniel Borkmann | 604d13c | 2013-12-23 14:35:56 +0100 | [diff] [blame] | 221 | nskb->pkt_type = netlink_is_kernel(sk) ? |
| 222 | PACKET_KERNEL : PACKET_USER; |
Daniel Borkmann | 4e48ed8 | 2014-08-07 22:22:47 +0200 | [diff] [blame] | 223 | skb_reset_network_header(nskb); |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 224 | ret = dev_queue_xmit(nskb); |
| 225 | if (unlikely(ret > 0)) |
| 226 | ret = net_xmit_errno(ret); |
| 227 | } |
| 228 | |
| 229 | dev_put(dev); |
| 230 | return ret; |
| 231 | } |
| 232 | |
| 233 | static void __netlink_deliver_tap(struct sk_buff *skb) |
| 234 | { |
| 235 | int ret; |
| 236 | struct netlink_tap *tmp; |
| 237 | |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 238 | if (!netlink_filter_tap(skb)) |
| 239 | return; |
| 240 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 241 | list_for_each_entry_rcu(tmp, &netlink_tap_all, list) { |
| 242 | ret = __netlink_deliver_tap_skb(skb, tmp->dev); |
| 243 | if (unlikely(ret)) |
| 244 | break; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | static void netlink_deliver_tap(struct sk_buff *skb) |
| 249 | { |
| 250 | rcu_read_lock(); |
| 251 | |
| 252 | if (unlikely(!list_empty(&netlink_tap_all))) |
| 253 | __netlink_deliver_tap(skb); |
| 254 | |
| 255 | rcu_read_unlock(); |
| 256 | } |
| 257 | |
Daniel Borkmann | 73bfd37 | 2013-12-23 14:35:55 +0100 | [diff] [blame] | 258 | static void netlink_deliver_tap_kernel(struct sock *dst, struct sock *src, |
| 259 | struct sk_buff *skb) |
| 260 | { |
| 261 | if (!(netlink_is_kernel(dst) && netlink_is_kernel(src))) |
| 262 | netlink_deliver_tap(skb); |
| 263 | } |
| 264 | |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 265 | static void netlink_overrun(struct sock *sk) |
| 266 | { |
| 267 | struct netlink_sock *nlk = nlk_sk(sk); |
| 268 | |
| 269 | if (!(nlk->flags & NETLINK_RECV_NO_ENOBUFS)) { |
| 270 | if (!test_and_set_bit(NETLINK_CONGESTED, &nlk_sk(sk)->state)) { |
| 271 | sk->sk_err = ENOBUFS; |
| 272 | sk->sk_error_report(sk); |
| 273 | } |
| 274 | } |
| 275 | atomic_inc(&sk->sk_drops); |
| 276 | } |
| 277 | |
| 278 | static void netlink_rcv_wake(struct sock *sk) |
| 279 | { |
| 280 | struct netlink_sock *nlk = nlk_sk(sk); |
| 281 | |
| 282 | if (skb_queue_empty(&sk->sk_receive_queue)) |
| 283 | clear_bit(NETLINK_CONGESTED, &nlk->state); |
| 284 | if (!test_bit(NETLINK_CONGESTED, &nlk->state)) |
| 285 | wake_up_interruptible(&nlk->wait); |
| 286 | } |
| 287 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 288 | #ifdef CONFIG_NETLINK_MMAP |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 289 | static bool netlink_skb_is_mmaped(const struct sk_buff *skb) |
| 290 | { |
| 291 | return NETLINK_CB(skb).flags & NETLINK_SKB_MMAPED; |
| 292 | } |
| 293 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 294 | static bool netlink_rx_is_mmaped(struct sock *sk) |
| 295 | { |
| 296 | return nlk_sk(sk)->rx_ring.pg_vec != NULL; |
| 297 | } |
| 298 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 299 | static bool netlink_tx_is_mmaped(struct sock *sk) |
| 300 | { |
| 301 | return nlk_sk(sk)->tx_ring.pg_vec != NULL; |
| 302 | } |
| 303 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 304 | static __pure struct page *pgvec_to_page(const void *addr) |
| 305 | { |
| 306 | if (is_vmalloc_addr(addr)) |
| 307 | return vmalloc_to_page(addr); |
| 308 | else |
| 309 | return virt_to_page(addr); |
| 310 | } |
| 311 | |
| 312 | static void free_pg_vec(void **pg_vec, unsigned int order, unsigned int len) |
| 313 | { |
| 314 | unsigned int i; |
| 315 | |
| 316 | for (i = 0; i < len; i++) { |
| 317 | if (pg_vec[i] != NULL) { |
| 318 | if (is_vmalloc_addr(pg_vec[i])) |
| 319 | vfree(pg_vec[i]); |
| 320 | else |
| 321 | free_pages((unsigned long)pg_vec[i], order); |
| 322 | } |
| 323 | } |
| 324 | kfree(pg_vec); |
| 325 | } |
| 326 | |
| 327 | static void *alloc_one_pg_vec_page(unsigned long order) |
| 328 | { |
| 329 | void *buffer; |
| 330 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | |
| 331 | __GFP_NOWARN | __GFP_NORETRY; |
| 332 | |
| 333 | buffer = (void *)__get_free_pages(gfp_flags, order); |
| 334 | if (buffer != NULL) |
| 335 | return buffer; |
| 336 | |
| 337 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
| 338 | if (buffer != NULL) |
| 339 | return buffer; |
| 340 | |
| 341 | gfp_flags &= ~__GFP_NORETRY; |
| 342 | return (void *)__get_free_pages(gfp_flags, order); |
| 343 | } |
| 344 | |
| 345 | static void **alloc_pg_vec(struct netlink_sock *nlk, |
| 346 | struct nl_mmap_req *req, unsigned int order) |
| 347 | { |
| 348 | unsigned int block_nr = req->nm_block_nr; |
| 349 | unsigned int i; |
Daniel Borkmann | 8a849bb | 2013-08-02 17:32:39 +0200 | [diff] [blame] | 350 | void **pg_vec; |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 351 | |
| 352 | pg_vec = kcalloc(block_nr, sizeof(void *), GFP_KERNEL); |
| 353 | if (pg_vec == NULL) |
| 354 | return NULL; |
| 355 | |
| 356 | for (i = 0; i < block_nr; i++) { |
Daniel Borkmann | 8a849bb | 2013-08-02 17:32:39 +0200 | [diff] [blame] | 357 | pg_vec[i] = alloc_one_pg_vec_page(order); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 358 | if (pg_vec[i] == NULL) |
| 359 | goto err1; |
| 360 | } |
| 361 | |
| 362 | return pg_vec; |
| 363 | err1: |
| 364 | free_pg_vec(pg_vec, order, block_nr); |
| 365 | return NULL; |
| 366 | } |
| 367 | |
| 368 | static int netlink_set_ring(struct sock *sk, struct nl_mmap_req *req, |
| 369 | bool closing, bool tx_ring) |
| 370 | { |
| 371 | struct netlink_sock *nlk = nlk_sk(sk); |
| 372 | struct netlink_ring *ring; |
| 373 | struct sk_buff_head *queue; |
| 374 | void **pg_vec = NULL; |
| 375 | unsigned int order = 0; |
| 376 | int err; |
| 377 | |
| 378 | ring = tx_ring ? &nlk->tx_ring : &nlk->rx_ring; |
| 379 | queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; |
| 380 | |
| 381 | if (!closing) { |
| 382 | if (atomic_read(&nlk->mapped)) |
| 383 | return -EBUSY; |
| 384 | if (atomic_read(&ring->pending)) |
| 385 | return -EBUSY; |
| 386 | } |
| 387 | |
| 388 | if (req->nm_block_nr) { |
| 389 | if (ring->pg_vec != NULL) |
| 390 | return -EBUSY; |
| 391 | |
| 392 | if ((int)req->nm_block_size <= 0) |
| 393 | return -EINVAL; |
Tobias Klauser | 74e83b2 | 2014-07-31 12:17:08 +0200 | [diff] [blame] | 394 | if (!PAGE_ALIGNED(req->nm_block_size)) |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 395 | return -EINVAL; |
| 396 | if (req->nm_frame_size < NL_MMAP_HDRLEN) |
| 397 | return -EINVAL; |
| 398 | if (!IS_ALIGNED(req->nm_frame_size, NL_MMAP_MSG_ALIGNMENT)) |
| 399 | return -EINVAL; |
| 400 | |
| 401 | ring->frames_per_block = req->nm_block_size / |
| 402 | req->nm_frame_size; |
| 403 | if (ring->frames_per_block == 0) |
| 404 | return -EINVAL; |
| 405 | if (ring->frames_per_block * req->nm_block_nr != |
| 406 | req->nm_frame_nr) |
| 407 | return -EINVAL; |
| 408 | |
| 409 | order = get_order(req->nm_block_size); |
| 410 | pg_vec = alloc_pg_vec(nlk, req, order); |
| 411 | if (pg_vec == NULL) |
| 412 | return -ENOMEM; |
| 413 | } else { |
| 414 | if (req->nm_frame_nr) |
| 415 | return -EINVAL; |
| 416 | } |
| 417 | |
| 418 | err = -EBUSY; |
| 419 | mutex_lock(&nlk->pg_vec_lock); |
| 420 | if (closing || atomic_read(&nlk->mapped) == 0) { |
| 421 | err = 0; |
| 422 | spin_lock_bh(&queue->lock); |
| 423 | |
| 424 | ring->frame_max = req->nm_frame_nr - 1; |
| 425 | ring->head = 0; |
| 426 | ring->frame_size = req->nm_frame_size; |
| 427 | ring->pg_vec_pages = req->nm_block_size / PAGE_SIZE; |
| 428 | |
| 429 | swap(ring->pg_vec_len, req->nm_block_nr); |
| 430 | swap(ring->pg_vec_order, order); |
| 431 | swap(ring->pg_vec, pg_vec); |
| 432 | |
| 433 | __skb_queue_purge(queue); |
| 434 | spin_unlock_bh(&queue->lock); |
| 435 | |
| 436 | WARN_ON(atomic_read(&nlk->mapped)); |
| 437 | } |
| 438 | mutex_unlock(&nlk->pg_vec_lock); |
| 439 | |
| 440 | if (pg_vec) |
| 441 | free_pg_vec(pg_vec, order, req->nm_block_nr); |
| 442 | return err; |
| 443 | } |
| 444 | |
| 445 | static void netlink_mm_open(struct vm_area_struct *vma) |
| 446 | { |
| 447 | struct file *file = vma->vm_file; |
| 448 | struct socket *sock = file->private_data; |
| 449 | struct sock *sk = sock->sk; |
| 450 | |
| 451 | if (sk) |
| 452 | atomic_inc(&nlk_sk(sk)->mapped); |
| 453 | } |
| 454 | |
| 455 | static void netlink_mm_close(struct vm_area_struct *vma) |
| 456 | { |
| 457 | struct file *file = vma->vm_file; |
| 458 | struct socket *sock = file->private_data; |
| 459 | struct sock *sk = sock->sk; |
| 460 | |
| 461 | if (sk) |
| 462 | atomic_dec(&nlk_sk(sk)->mapped); |
| 463 | } |
| 464 | |
| 465 | static const struct vm_operations_struct netlink_mmap_ops = { |
| 466 | .open = netlink_mm_open, |
| 467 | .close = netlink_mm_close, |
| 468 | }; |
| 469 | |
| 470 | static int netlink_mmap(struct file *file, struct socket *sock, |
| 471 | struct vm_area_struct *vma) |
| 472 | { |
| 473 | struct sock *sk = sock->sk; |
| 474 | struct netlink_sock *nlk = nlk_sk(sk); |
| 475 | struct netlink_ring *ring; |
| 476 | unsigned long start, size, expected; |
| 477 | unsigned int i; |
| 478 | int err = -EINVAL; |
| 479 | |
| 480 | if (vma->vm_pgoff) |
| 481 | return -EINVAL; |
| 482 | |
| 483 | mutex_lock(&nlk->pg_vec_lock); |
| 484 | |
| 485 | expected = 0; |
| 486 | for (ring = &nlk->rx_ring; ring <= &nlk->tx_ring; ring++) { |
| 487 | if (ring->pg_vec == NULL) |
| 488 | continue; |
| 489 | expected += ring->pg_vec_len * ring->pg_vec_pages * PAGE_SIZE; |
| 490 | } |
| 491 | |
| 492 | if (expected == 0) |
| 493 | goto out; |
| 494 | |
| 495 | size = vma->vm_end - vma->vm_start; |
| 496 | if (size != expected) |
| 497 | goto out; |
| 498 | |
| 499 | start = vma->vm_start; |
| 500 | for (ring = &nlk->rx_ring; ring <= &nlk->tx_ring; ring++) { |
| 501 | if (ring->pg_vec == NULL) |
| 502 | continue; |
| 503 | |
| 504 | for (i = 0; i < ring->pg_vec_len; i++) { |
| 505 | struct page *page; |
| 506 | void *kaddr = ring->pg_vec[i]; |
| 507 | unsigned int pg_num; |
| 508 | |
| 509 | for (pg_num = 0; pg_num < ring->pg_vec_pages; pg_num++) { |
| 510 | page = pgvec_to_page(kaddr); |
| 511 | err = vm_insert_page(vma, start, page); |
| 512 | if (err < 0) |
| 513 | goto out; |
| 514 | start += PAGE_SIZE; |
| 515 | kaddr += PAGE_SIZE; |
| 516 | } |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | atomic_inc(&nlk->mapped); |
| 521 | vma->vm_ops = &netlink_mmap_ops; |
| 522 | err = 0; |
| 523 | out: |
| 524 | mutex_unlock(&nlk->pg_vec_lock); |
Patrick McHardy | 7cdbac7 | 2013-06-11 02:52:47 -0700 | [diff] [blame] | 525 | return err; |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 526 | } |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 527 | |
| 528 | static void netlink_frame_flush_dcache(const struct nl_mmap_hdr *hdr) |
| 529 | { |
| 530 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
| 531 | struct page *p_start, *p_end; |
| 532 | |
| 533 | /* First page is flushed through netlink_{get,set}_status */ |
| 534 | p_start = pgvec_to_page(hdr + PAGE_SIZE); |
Stephen Rothwell | 1d5085c | 2013-04-23 17:40:35 +1000 | [diff] [blame] | 535 | p_end = pgvec_to_page((void *)hdr + NL_MMAP_HDRLEN + hdr->nm_len - 1); |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 536 | while (p_start <= p_end) { |
| 537 | flush_dcache_page(p_start); |
| 538 | p_start++; |
| 539 | } |
| 540 | #endif |
| 541 | } |
| 542 | |
| 543 | static enum nl_mmap_status netlink_get_status(const struct nl_mmap_hdr *hdr) |
| 544 | { |
| 545 | smp_rmb(); |
| 546 | flush_dcache_page(pgvec_to_page(hdr)); |
| 547 | return hdr->nm_status; |
| 548 | } |
| 549 | |
| 550 | static void netlink_set_status(struct nl_mmap_hdr *hdr, |
| 551 | enum nl_mmap_status status) |
| 552 | { |
| 553 | hdr->nm_status = status; |
| 554 | flush_dcache_page(pgvec_to_page(hdr)); |
| 555 | smp_wmb(); |
| 556 | } |
| 557 | |
| 558 | static struct nl_mmap_hdr * |
| 559 | __netlink_lookup_frame(const struct netlink_ring *ring, unsigned int pos) |
| 560 | { |
| 561 | unsigned int pg_vec_pos, frame_off; |
| 562 | |
| 563 | pg_vec_pos = pos / ring->frames_per_block; |
| 564 | frame_off = pos % ring->frames_per_block; |
| 565 | |
| 566 | return ring->pg_vec[pg_vec_pos] + (frame_off * ring->frame_size); |
| 567 | } |
| 568 | |
| 569 | static struct nl_mmap_hdr * |
| 570 | netlink_lookup_frame(const struct netlink_ring *ring, unsigned int pos, |
| 571 | enum nl_mmap_status status) |
| 572 | { |
| 573 | struct nl_mmap_hdr *hdr; |
| 574 | |
| 575 | hdr = __netlink_lookup_frame(ring, pos); |
| 576 | if (netlink_get_status(hdr) != status) |
| 577 | return NULL; |
| 578 | |
| 579 | return hdr; |
| 580 | } |
| 581 | |
| 582 | static struct nl_mmap_hdr * |
| 583 | netlink_current_frame(const struct netlink_ring *ring, |
| 584 | enum nl_mmap_status status) |
| 585 | { |
| 586 | return netlink_lookup_frame(ring, ring->head, status); |
| 587 | } |
| 588 | |
| 589 | static struct nl_mmap_hdr * |
| 590 | netlink_previous_frame(const struct netlink_ring *ring, |
| 591 | enum nl_mmap_status status) |
| 592 | { |
| 593 | unsigned int prev; |
| 594 | |
| 595 | prev = ring->head ? ring->head - 1 : ring->frame_max; |
| 596 | return netlink_lookup_frame(ring, prev, status); |
| 597 | } |
| 598 | |
| 599 | static void netlink_increment_head(struct netlink_ring *ring) |
| 600 | { |
| 601 | ring->head = ring->head != ring->frame_max ? ring->head + 1 : 0; |
| 602 | } |
| 603 | |
| 604 | static void netlink_forward_ring(struct netlink_ring *ring) |
| 605 | { |
| 606 | unsigned int head = ring->head, pos = head; |
| 607 | const struct nl_mmap_hdr *hdr; |
| 608 | |
| 609 | do { |
| 610 | hdr = __netlink_lookup_frame(ring, pos); |
| 611 | if (hdr->nm_status == NL_MMAP_STATUS_UNUSED) |
| 612 | break; |
| 613 | if (hdr->nm_status != NL_MMAP_STATUS_SKIP) |
| 614 | break; |
| 615 | netlink_increment_head(ring); |
| 616 | } while (ring->head != head); |
| 617 | } |
| 618 | |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 619 | static bool netlink_dump_space(struct netlink_sock *nlk) |
| 620 | { |
| 621 | struct netlink_ring *ring = &nlk->rx_ring; |
| 622 | struct nl_mmap_hdr *hdr; |
| 623 | unsigned int n; |
| 624 | |
| 625 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED); |
| 626 | if (hdr == NULL) |
| 627 | return false; |
| 628 | |
| 629 | n = ring->head + ring->frame_max / 2; |
| 630 | if (n > ring->frame_max) |
| 631 | n -= ring->frame_max; |
| 632 | |
| 633 | hdr = __netlink_lookup_frame(ring, n); |
| 634 | |
| 635 | return hdr->nm_status == NL_MMAP_STATUS_UNUSED; |
| 636 | } |
| 637 | |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 638 | static unsigned int netlink_poll(struct file *file, struct socket *sock, |
| 639 | poll_table *wait) |
| 640 | { |
| 641 | struct sock *sk = sock->sk; |
| 642 | struct netlink_sock *nlk = nlk_sk(sk); |
| 643 | unsigned int mask; |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 644 | int err; |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 645 | |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 646 | if (nlk->rx_ring.pg_vec != NULL) { |
| 647 | /* Memory mapped sockets don't call recvmsg(), so flow control |
| 648 | * for dumps is performed here. A dump is allowed to continue |
| 649 | * if at least half the ring is unused. |
| 650 | */ |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 651 | while (nlk->cb_running && netlink_dump_space(nlk)) { |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 652 | err = netlink_dump(sk); |
| 653 | if (err < 0) { |
Ben Pfaff | ac30ef8 | 2014-07-09 10:31:22 -0700 | [diff] [blame] | 654 | sk->sk_err = -err; |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 655 | sk->sk_error_report(sk); |
| 656 | break; |
| 657 | } |
| 658 | } |
| 659 | netlink_rcv_wake(sk); |
| 660 | } |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 661 | |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 662 | mask = datagram_poll(file, sock, wait); |
| 663 | |
| 664 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 665 | if (nlk->rx_ring.pg_vec) { |
| 666 | netlink_forward_ring(&nlk->rx_ring); |
| 667 | if (!netlink_previous_frame(&nlk->rx_ring, NL_MMAP_STATUS_UNUSED)) |
| 668 | mask |= POLLIN | POLLRDNORM; |
| 669 | } |
| 670 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 671 | |
| 672 | spin_lock_bh(&sk->sk_write_queue.lock); |
| 673 | if (nlk->tx_ring.pg_vec) { |
| 674 | if (netlink_current_frame(&nlk->tx_ring, NL_MMAP_STATUS_UNUSED)) |
| 675 | mask |= POLLOUT | POLLWRNORM; |
| 676 | } |
| 677 | spin_unlock_bh(&sk->sk_write_queue.lock); |
| 678 | |
| 679 | return mask; |
| 680 | } |
| 681 | |
| 682 | static struct nl_mmap_hdr *netlink_mmap_hdr(struct sk_buff *skb) |
| 683 | { |
| 684 | return (struct nl_mmap_hdr *)(skb->head - NL_MMAP_HDRLEN); |
| 685 | } |
| 686 | |
| 687 | static void netlink_ring_setup_skb(struct sk_buff *skb, struct sock *sk, |
| 688 | struct netlink_ring *ring, |
| 689 | struct nl_mmap_hdr *hdr) |
| 690 | { |
| 691 | unsigned int size; |
| 692 | void *data; |
| 693 | |
| 694 | size = ring->frame_size - NL_MMAP_HDRLEN; |
| 695 | data = (void *)hdr + NL_MMAP_HDRLEN; |
| 696 | |
| 697 | skb->head = data; |
| 698 | skb->data = data; |
| 699 | skb_reset_tail_pointer(skb); |
| 700 | skb->end = skb->tail + size; |
| 701 | skb->len = 0; |
| 702 | |
| 703 | skb->destructor = netlink_skb_destructor; |
| 704 | NETLINK_CB(skb).flags |= NETLINK_SKB_MMAPED; |
| 705 | NETLINK_CB(skb).sk = sk; |
| 706 | } |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 707 | |
| 708 | static int netlink_mmap_sendmsg(struct sock *sk, struct msghdr *msg, |
| 709 | u32 dst_portid, u32 dst_group, |
| 710 | struct sock_iocb *siocb) |
| 711 | { |
| 712 | struct netlink_sock *nlk = nlk_sk(sk); |
| 713 | struct netlink_ring *ring; |
| 714 | struct nl_mmap_hdr *hdr; |
| 715 | struct sk_buff *skb; |
| 716 | unsigned int maxlen; |
| 717 | bool excl = true; |
| 718 | int err = 0, len = 0; |
| 719 | |
| 720 | /* Netlink messages are validated by the receiver before processing. |
| 721 | * In order to avoid userspace changing the contents of the message |
| 722 | * after validation, the socket and the ring may only be used by a |
| 723 | * single process, otherwise we fall back to copying. |
| 724 | */ |
Al Viro | 24dff96 | 2014-10-08 23:44:00 -0400 | [diff] [blame] | 725 | if (atomic_long_read(&sk->sk_socket->file->f_count) > 1 || |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 726 | atomic_read(&nlk->mapped) > 1) |
| 727 | excl = false; |
| 728 | |
| 729 | mutex_lock(&nlk->pg_vec_lock); |
| 730 | |
| 731 | ring = &nlk->tx_ring; |
| 732 | maxlen = ring->frame_size - NL_MMAP_HDRLEN; |
| 733 | |
| 734 | do { |
| 735 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_VALID); |
| 736 | if (hdr == NULL) { |
| 737 | if (!(msg->msg_flags & MSG_DONTWAIT) && |
| 738 | atomic_read(&nlk->tx_ring.pending)) |
| 739 | schedule(); |
| 740 | continue; |
| 741 | } |
| 742 | if (hdr->nm_len > maxlen) { |
| 743 | err = -EINVAL; |
| 744 | goto out; |
| 745 | } |
| 746 | |
| 747 | netlink_frame_flush_dcache(hdr); |
| 748 | |
| 749 | if (likely(dst_portid == 0 && dst_group == 0 && excl)) { |
| 750 | skb = alloc_skb_head(GFP_KERNEL); |
| 751 | if (skb == NULL) { |
| 752 | err = -ENOBUFS; |
| 753 | goto out; |
| 754 | } |
| 755 | sock_hold(sk); |
| 756 | netlink_ring_setup_skb(skb, sk, ring, hdr); |
| 757 | NETLINK_CB(skb).flags |= NETLINK_SKB_TX; |
| 758 | __skb_put(skb, hdr->nm_len); |
| 759 | netlink_set_status(hdr, NL_MMAP_STATUS_RESERVED); |
| 760 | atomic_inc(&ring->pending); |
| 761 | } else { |
| 762 | skb = alloc_skb(hdr->nm_len, GFP_KERNEL); |
| 763 | if (skb == NULL) { |
| 764 | err = -ENOBUFS; |
| 765 | goto out; |
| 766 | } |
| 767 | __skb_put(skb, hdr->nm_len); |
| 768 | memcpy(skb->data, (void *)hdr + NL_MMAP_HDRLEN, hdr->nm_len); |
| 769 | netlink_set_status(hdr, NL_MMAP_STATUS_UNUSED); |
| 770 | } |
| 771 | |
| 772 | netlink_increment_head(ring); |
| 773 | |
| 774 | NETLINK_CB(skb).portid = nlk->portid; |
| 775 | NETLINK_CB(skb).dst_group = dst_group; |
| 776 | NETLINK_CB(skb).creds = siocb->scm->creds; |
| 777 | |
| 778 | err = security_netlink_send(sk, skb); |
| 779 | if (err) { |
| 780 | kfree_skb(skb); |
| 781 | goto out; |
| 782 | } |
| 783 | |
| 784 | if (unlikely(dst_group)) { |
| 785 | atomic_inc(&skb->users); |
| 786 | netlink_broadcast(sk, skb, dst_portid, dst_group, |
| 787 | GFP_KERNEL); |
| 788 | } |
| 789 | err = netlink_unicast(sk, skb, dst_portid, |
| 790 | msg->msg_flags & MSG_DONTWAIT); |
| 791 | if (err < 0) |
| 792 | goto out; |
| 793 | len += err; |
| 794 | |
| 795 | } while (hdr != NULL || |
| 796 | (!(msg->msg_flags & MSG_DONTWAIT) && |
| 797 | atomic_read(&nlk->tx_ring.pending))); |
| 798 | |
| 799 | if (len > 0) |
| 800 | err = len; |
| 801 | out: |
| 802 | mutex_unlock(&nlk->pg_vec_lock); |
| 803 | return err; |
| 804 | } |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 805 | |
| 806 | static void netlink_queue_mmaped_skb(struct sock *sk, struct sk_buff *skb) |
| 807 | { |
| 808 | struct nl_mmap_hdr *hdr; |
| 809 | |
| 810 | hdr = netlink_mmap_hdr(skb); |
| 811 | hdr->nm_len = skb->len; |
| 812 | hdr->nm_group = NETLINK_CB(skb).dst_group; |
| 813 | hdr->nm_pid = NETLINK_CB(skb).creds.pid; |
Nicolas Dichtel | 1bf9310 | 2013-04-24 10:36:23 +0200 | [diff] [blame] | 814 | hdr->nm_uid = from_kuid(sk_user_ns(sk), NETLINK_CB(skb).creds.uid); |
| 815 | hdr->nm_gid = from_kgid(sk_user_ns(sk), NETLINK_CB(skb).creds.gid); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 816 | netlink_frame_flush_dcache(hdr); |
| 817 | netlink_set_status(hdr, NL_MMAP_STATUS_VALID); |
| 818 | |
| 819 | NETLINK_CB(skb).flags |= NETLINK_SKB_DELIVERED; |
| 820 | kfree_skb(skb); |
| 821 | } |
| 822 | |
| 823 | static void netlink_ring_set_copied(struct sock *sk, struct sk_buff *skb) |
| 824 | { |
| 825 | struct netlink_sock *nlk = nlk_sk(sk); |
| 826 | struct netlink_ring *ring = &nlk->rx_ring; |
| 827 | struct nl_mmap_hdr *hdr; |
| 828 | |
| 829 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 830 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED); |
| 831 | if (hdr == NULL) { |
| 832 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 833 | kfree_skb(skb); |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 834 | netlink_overrun(sk); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 835 | return; |
| 836 | } |
| 837 | netlink_increment_head(ring); |
| 838 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
| 839 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 840 | |
| 841 | hdr->nm_len = skb->len; |
| 842 | hdr->nm_group = NETLINK_CB(skb).dst_group; |
| 843 | hdr->nm_pid = NETLINK_CB(skb).creds.pid; |
Nicolas Dichtel | 1bf9310 | 2013-04-24 10:36:23 +0200 | [diff] [blame] | 844 | hdr->nm_uid = from_kuid(sk_user_ns(sk), NETLINK_CB(skb).creds.uid); |
| 845 | hdr->nm_gid = from_kgid(sk_user_ns(sk), NETLINK_CB(skb).creds.gid); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 846 | netlink_set_status(hdr, NL_MMAP_STATUS_COPY); |
| 847 | } |
| 848 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 849 | #else /* CONFIG_NETLINK_MMAP */ |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 850 | #define netlink_skb_is_mmaped(skb) false |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 851 | #define netlink_rx_is_mmaped(sk) false |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 852 | #define netlink_tx_is_mmaped(sk) false |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 853 | #define netlink_mmap sock_no_mmap |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 854 | #define netlink_poll datagram_poll |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 855 | #define netlink_mmap_sendmsg(sk, msg, dst_portid, dst_group, siocb) 0 |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 856 | #endif /* CONFIG_NETLINK_MMAP */ |
| 857 | |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 858 | static void netlink_skb_destructor(struct sk_buff *skb) |
| 859 | { |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 860 | #ifdef CONFIG_NETLINK_MMAP |
| 861 | struct nl_mmap_hdr *hdr; |
| 862 | struct netlink_ring *ring; |
| 863 | struct sock *sk; |
| 864 | |
| 865 | /* If a packet from the kernel to userspace was freed because of an |
| 866 | * error without being delivered to userspace, the kernel must reset |
| 867 | * the status. In the direction userspace to kernel, the status is |
| 868 | * always reset here after the packet was processed and freed. |
| 869 | */ |
| 870 | if (netlink_skb_is_mmaped(skb)) { |
| 871 | hdr = netlink_mmap_hdr(skb); |
| 872 | sk = NETLINK_CB(skb).sk; |
| 873 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 874 | if (NETLINK_CB(skb).flags & NETLINK_SKB_TX) { |
| 875 | netlink_set_status(hdr, NL_MMAP_STATUS_UNUSED); |
| 876 | ring = &nlk_sk(sk)->tx_ring; |
| 877 | } else { |
| 878 | if (!(NETLINK_CB(skb).flags & NETLINK_SKB_DELIVERED)) { |
| 879 | hdr->nm_len = 0; |
| 880 | netlink_set_status(hdr, NL_MMAP_STATUS_VALID); |
| 881 | } |
| 882 | ring = &nlk_sk(sk)->rx_ring; |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 883 | } |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 884 | |
| 885 | WARN_ON(atomic_read(&ring->pending) == 0); |
| 886 | atomic_dec(&ring->pending); |
| 887 | sock_put(sk); |
| 888 | |
Pablo Neira | 5e71d9d | 2013-06-03 09:28:43 +0000 | [diff] [blame] | 889 | skb->head = NULL; |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 890 | } |
| 891 | #endif |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 892 | if (is_vmalloc_addr(skb->head)) { |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 893 | if (!skb->cloned || |
| 894 | !atomic_dec_return(&(skb_shinfo(skb)->dataref))) |
| 895 | vfree(skb->head); |
| 896 | |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 897 | skb->head = NULL; |
| 898 | } |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 899 | if (skb->sk != NULL) |
| 900 | sock_rfree(skb); |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 901 | } |
| 902 | |
| 903 | static void netlink_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
| 904 | { |
| 905 | WARN_ON(skb->sk != NULL); |
| 906 | skb->sk = sk; |
| 907 | skb->destructor = netlink_skb_destructor; |
| 908 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); |
| 909 | sk_mem_charge(sk, skb->truesize); |
| 910 | } |
| 911 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | static void netlink_sock_destruct(struct sock *sk) |
| 913 | { |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 914 | struct netlink_sock *nlk = nlk_sk(sk); |
| 915 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 916 | if (nlk->cb_running) { |
| 917 | if (nlk->cb.done) |
| 918 | nlk->cb.done(&nlk->cb); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 919 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 920 | module_put(nlk->cb.module); |
| 921 | kfree_skb(nlk->cb.skb); |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 922 | } |
| 923 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | skb_queue_purge(&sk->sk_receive_queue); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 925 | #ifdef CONFIG_NETLINK_MMAP |
| 926 | if (1) { |
| 927 | struct nl_mmap_req req; |
| 928 | |
| 929 | memset(&req, 0, sizeof(req)); |
| 930 | if (nlk->rx_ring.pg_vec) |
| 931 | netlink_set_ring(sk, &req, true, false); |
| 932 | memset(&req, 0, sizeof(req)); |
| 933 | if (nlk->tx_ring.pg_vec) |
| 934 | netlink_set_ring(sk, &req, true, true); |
| 935 | } |
| 936 | #endif /* CONFIG_NETLINK_MMAP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | |
| 938 | if (!sock_flag(sk, SOCK_DEAD)) { |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 939 | printk(KERN_ERR "Freeing alive netlink socket %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | return; |
| 941 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 942 | |
| 943 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| 944 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
| 945 | WARN_ON(nlk_sk(sk)->groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
| 947 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 948 | /* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on |
| 949 | * SMP. Look, when several writers sleep and reader wakes them up, all but one |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | * immediately hit write lock and grab all the cpus. Exclusive sleep solves |
| 951 | * this, _but_ remember, it adds useless work on UP machines. |
| 952 | */ |
| 953 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 954 | void netlink_table_grab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 955 | __acquires(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | { |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 957 | might_sleep(); |
| 958 | |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 959 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | |
| 961 | if (atomic_read(&nl_table_users)) { |
| 962 | DECLARE_WAITQUEUE(wait, current); |
| 963 | |
| 964 | add_wait_queue_exclusive(&nl_table_wait, &wait); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 965 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 967 | if (atomic_read(&nl_table_users) == 0) |
| 968 | break; |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 969 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | schedule(); |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 971 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | __set_current_state(TASK_RUNNING); |
| 975 | remove_wait_queue(&nl_table_wait, &wait); |
| 976 | } |
| 977 | } |
| 978 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 979 | void netlink_table_ungrab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 980 | __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | { |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 982 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | wake_up(&nl_table_wait); |
| 984 | } |
| 985 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 986 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | netlink_lock_table(void) |
| 988 | { |
| 989 | /* read_lock() synchronizes us to netlink_table_grab */ |
| 990 | |
| 991 | read_lock(&nl_table_lock); |
| 992 | atomic_inc(&nl_table_users); |
| 993 | read_unlock(&nl_table_lock); |
| 994 | } |
| 995 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 996 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | netlink_unlock_table(void) |
| 998 | { |
| 999 | if (atomic_dec_and_test(&nl_table_users)) |
| 1000 | wake_up(&nl_table_wait); |
| 1001 | } |
| 1002 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1003 | struct netlink_compare_arg |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1004 | { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1005 | struct net *net; |
| 1006 | u32 portid; |
| 1007 | }; |
| 1008 | |
| 1009 | static bool netlink_compare(void *ptr, void *arg) |
| 1010 | { |
| 1011 | struct netlink_compare_arg *x = arg; |
| 1012 | struct sock *sk = ptr; |
| 1013 | |
| 1014 | return nlk_sk(sk)->portid == x->portid && |
| 1015 | net_eq(sock_net(sk), x->net); |
| 1016 | } |
| 1017 | |
| 1018 | static struct sock *__netlink_lookup(struct netlink_table *table, u32 portid, |
| 1019 | struct net *net) |
| 1020 | { |
| 1021 | struct netlink_compare_arg arg = { |
| 1022 | .net = net, |
| 1023 | .portid = portid, |
| 1024 | }; |
| 1025 | u32 hash; |
| 1026 | |
| 1027 | hash = rhashtable_hashfn(&table->hash, &portid, sizeof(portid)); |
| 1028 | |
| 1029 | return rhashtable_lookup_compare(&table->hash, hash, |
| 1030 | &netlink_compare, &arg); |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1031 | } |
| 1032 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1033 | static struct sock *netlink_lookup(struct net *net, int protocol, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | { |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1035 | struct netlink_table *table = &nl_table[protocol]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 1038 | read_lock(&nl_table_lock); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1039 | rcu_read_lock(); |
| 1040 | sk = __netlink_lookup(table, portid, net); |
| 1041 | if (sk) |
| 1042 | sock_hold(sk); |
| 1043 | rcu_read_unlock(); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 1044 | read_unlock(&nl_table_lock); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | return sk; |
| 1047 | } |
| 1048 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1049 | static const struct proto_ops netlink_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1051 | static void |
| 1052 | netlink_update_listeners(struct sock *sk) |
| 1053 | { |
| 1054 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1055 | unsigned long mask; |
| 1056 | unsigned int i; |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1057 | struct listeners *listeners; |
| 1058 | |
| 1059 | listeners = nl_deref_protected(tbl->listeners); |
| 1060 | if (!listeners) |
| 1061 | return; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1062 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1063 | for (i = 0; i < NLGRPLONGS(tbl->groups); i++) { |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1064 | mask = 0; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1065 | sk_for_each_bound(sk, &tbl->mc_list) { |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1066 | if (i < NLGRPLONGS(nlk_sk(sk)->ngroups)) |
| 1067 | mask |= nlk_sk(sk)->groups[i]; |
| 1068 | } |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1069 | listeners->masks[i] = mask; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1070 | } |
| 1071 | /* this function is only called with the netlink table "grabbed", which |
| 1072 | * makes sure updates are visible before bind or setsockopt return. */ |
| 1073 | } |
| 1074 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1075 | static int netlink_insert(struct sock *sk, struct net *net, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | { |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1077 | struct netlink_table *table = &nl_table[sk->sk_protocol]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | int err = -EADDRINUSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1080 | mutex_lock(&nl_sk_hash_lock); |
| 1081 | if (__netlink_lookup(table, portid, net)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | goto err; |
| 1083 | |
| 1084 | err = -EBUSY; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1085 | if (nlk_sk(sk)->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | goto err; |
| 1087 | |
| 1088 | err = -ENOMEM; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1089 | if (BITS_PER_LONG > 32 && unlikely(table->hash.nelems >= UINT_MAX)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | goto err; |
| 1091 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1092 | nlk_sk(sk)->portid = portid; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1093 | sock_hold(sk); |
Thomas Graf | 6eba822 | 2014-11-13 13:45:46 +0100 | [diff] [blame] | 1094 | rhashtable_insert(&table->hash, &nlk_sk(sk)->node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | err: |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1097 | mutex_unlock(&nl_sk_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | return err; |
| 1099 | } |
| 1100 | |
| 1101 | static void netlink_remove(struct sock *sk) |
| 1102 | { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1103 | struct netlink_table *table; |
| 1104 | |
| 1105 | mutex_lock(&nl_sk_hash_lock); |
| 1106 | table = &nl_table[sk->sk_protocol]; |
Thomas Graf | 6eba822 | 2014-11-13 13:45:46 +0100 | [diff] [blame] | 1107 | if (rhashtable_remove(&table->hash, &nlk_sk(sk)->node)) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1108 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); |
| 1109 | __sock_put(sk); |
| 1110 | } |
| 1111 | mutex_unlock(&nl_sk_hash_lock); |
| 1112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | netlink_table_grab(); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1114 | if (nlk_sk(sk)->subscriptions) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | __sk_del_bind_node(sk); |
| 1116 | netlink_table_ungrab(); |
| 1117 | } |
| 1118 | |
| 1119 | static struct proto netlink_proto = { |
| 1120 | .name = "NETLINK", |
| 1121 | .owner = THIS_MODULE, |
| 1122 | .obj_size = sizeof(struct netlink_sock), |
| 1123 | }; |
| 1124 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 1125 | static int __netlink_create(struct net *net, struct socket *sock, |
| 1126 | struct mutex *cb_mutex, int protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | { |
| 1128 | struct sock *sk; |
| 1129 | struct netlink_sock *nlk; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1130 | |
| 1131 | sock->ops = &netlink_ops; |
| 1132 | |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 1133 | sk = sk_alloc(net, PF_NETLINK, GFP_KERNEL, &netlink_proto); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1134 | if (!sk) |
| 1135 | return -ENOMEM; |
| 1136 | |
| 1137 | sock_init_data(sock, sk); |
| 1138 | |
| 1139 | nlk = nlk_sk(sk); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1140 | if (cb_mutex) { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 1141 | nlk->cb_mutex = cb_mutex; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1142 | } else { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 1143 | nlk->cb_mutex = &nlk->cb_def_mutex; |
| 1144 | mutex_init(nlk->cb_mutex); |
| 1145 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1146 | init_waitqueue_head(&nlk->wait); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 1147 | #ifdef CONFIG_NETLINK_MMAP |
| 1148 | mutex_init(&nlk->pg_vec_lock); |
| 1149 | #endif |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1150 | |
| 1151 | sk->sk_destruct = netlink_sock_destruct; |
| 1152 | sk->sk_protocol = protocol; |
| 1153 | return 0; |
| 1154 | } |
| 1155 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 1156 | static int netlink_create(struct net *net, struct socket *sock, int protocol, |
| 1157 | int kern) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1158 | { |
| 1159 | struct module *module = NULL; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1160 | struct mutex *cb_mutex; |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1161 | struct netlink_sock *nlk; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1162 | int (*bind)(int group); |
| 1163 | void (*unbind)(int group); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1164 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | |
| 1166 | sock->state = SS_UNCONNECTED; |
| 1167 | |
| 1168 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) |
| 1169 | return -ESOCKTNOSUPPORT; |
| 1170 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1171 | if (protocol < 0 || protocol >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | return -EPROTONOSUPPORT; |
| 1173 | |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1174 | netlink_lock_table(); |
Johannes Berg | 95a5afc | 2008-10-16 15:24:51 -0700 | [diff] [blame] | 1175 | #ifdef CONFIG_MODULES |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1176 | if (!nl_table[protocol].registered) { |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1177 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1178 | request_module("net-pf-%d-proto-%d", PF_NETLINK, protocol); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1179 | netlink_lock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1180 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1181 | #endif |
| 1182 | if (nl_table[protocol].registered && |
| 1183 | try_module_get(nl_table[protocol].module)) |
| 1184 | module = nl_table[protocol].module; |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 1185 | else |
| 1186 | err = -EPROTONOSUPPORT; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1187 | cb_mutex = nl_table[protocol].cb_mutex; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 1188 | bind = nl_table[protocol].bind; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1189 | unbind = nl_table[protocol].unbind; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1190 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1191 | |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 1192 | if (err < 0) |
| 1193 | goto out; |
| 1194 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1195 | err = __netlink_create(net, sock, cb_mutex, protocol); |
| 1196 | if (err < 0) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1197 | goto out_module; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 1199 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 1200 | sock_prot_inuse_add(net, &netlink_proto, 1); |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 1201 | local_bh_enable(); |
| 1202 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1203 | nlk = nlk_sk(sock->sk); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1204 | nlk->module = module; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 1205 | nlk->netlink_bind = bind; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1206 | nlk->netlink_unbind = unbind; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1207 | out: |
| 1208 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1210 | out_module: |
| 1211 | module_put(module); |
| 1212 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | } |
| 1214 | |
| 1215 | static int netlink_release(struct socket *sock) |
| 1216 | { |
| 1217 | struct sock *sk = sock->sk; |
| 1218 | struct netlink_sock *nlk; |
| 1219 | |
| 1220 | if (!sk) |
| 1221 | return 0; |
| 1222 | |
| 1223 | netlink_remove(sk); |
Denis Lunev | ac57b3a | 2007-04-18 17:05:58 -0700 | [diff] [blame] | 1224 | sock_orphan(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | nlk = nlk_sk(sk); |
| 1226 | |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 1227 | /* |
| 1228 | * OK. Socket is unlinked, any packets that arrive now |
| 1229 | * will be purged. |
| 1230 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | sock->sk = NULL; |
| 1233 | wake_up_interruptible_all(&nlk->wait); |
| 1234 | |
| 1235 | skb_queue_purge(&sk->sk_write_queue); |
| 1236 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1237 | if (nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | struct netlink_notify n = { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1239 | .net = sock_net(sk), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | .protocol = sk->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1241 | .portid = nlk->portid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | }; |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1243 | atomic_notifier_call_chain(&netlink_chain, |
| 1244 | NETLINK_URELEASE, &n); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1245 | } |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1246 | |
Mariusz Kozlowski | 5e7c001 | 2007-01-02 15:24:30 -0800 | [diff] [blame] | 1247 | module_put(nlk->module); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1248 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1249 | netlink_table_grab(); |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1250 | if (netlink_is_kernel(sk)) { |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1251 | BUG_ON(nl_table[sk->sk_protocol].registered == 0); |
| 1252 | if (--nl_table[sk->sk_protocol].registered == 0) { |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1253 | struct listeners *old; |
| 1254 | |
| 1255 | old = nl_deref_protected(nl_table[sk->sk_protocol].listeners); |
| 1256 | RCU_INIT_POINTER(nl_table[sk->sk_protocol].listeners, NULL); |
| 1257 | kfree_rcu(old, rcu); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1258 | nl_table[sk->sk_protocol].module = NULL; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1259 | nl_table[sk->sk_protocol].bind = NULL; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1260 | nl_table[sk->sk_protocol].unbind = NULL; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1261 | nl_table[sk->sk_protocol].flags = 0; |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1262 | nl_table[sk->sk_protocol].registered = 0; |
| 1263 | } |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1264 | } else if (nlk->subscriptions) { |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1265 | netlink_update_listeners(sk); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1266 | } |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1267 | netlink_table_ungrab(); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1268 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1269 | kfree(nlk->groups); |
| 1270 | nlk->groups = NULL; |
| 1271 | |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 1272 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 1273 | sock_prot_inuse_add(sock_net(sk), &netlink_proto, -1); |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 1274 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | sock_put(sk); |
| 1276 | return 0; |
| 1277 | } |
| 1278 | |
| 1279 | static int netlink_autobind(struct socket *sock) |
| 1280 | { |
| 1281 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1282 | struct net *net = sock_net(sk); |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1283 | struct netlink_table *table = &nl_table[sk->sk_protocol]; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1284 | s32 portid = task_tgid_vnr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | int err; |
| 1286 | static s32 rover = -4097; |
| 1287 | |
| 1288 | retry: |
| 1289 | cond_resched(); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 1290 | netlink_table_grab(); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1291 | rcu_read_lock(); |
| 1292 | if (__netlink_lookup(table, portid, net)) { |
| 1293 | /* Bind collision, search negative portid values. */ |
| 1294 | portid = rover--; |
| 1295 | if (rover > -4097) |
| 1296 | rover = -4097; |
| 1297 | rcu_read_unlock(); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 1298 | netlink_table_ungrab(); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1299 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | } |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1301 | rcu_read_unlock(); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 1302 | netlink_table_ungrab(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1304 | err = netlink_insert(sk, net, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | if (err == -EADDRINUSE) |
| 1306 | goto retry; |
David S. Miller | d470e3b | 2005-06-26 15:31:51 -0700 | [diff] [blame] | 1307 | |
| 1308 | /* If 2 threads race to autobind, that is fine. */ |
| 1309 | if (err == -EBUSY) |
| 1310 | err = 0; |
| 1311 | |
| 1312 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | } |
| 1314 | |
Eric W. Biederman | aa4cf94 | 2014-04-23 14:28:03 -0700 | [diff] [blame] | 1315 | /** |
| 1316 | * __netlink_ns_capable - General netlink message capability test |
| 1317 | * @nsp: NETLINK_CB of the socket buffer holding a netlink command from userspace. |
| 1318 | * @user_ns: The user namespace of the capability to use |
| 1319 | * @cap: The capability to use |
| 1320 | * |
| 1321 | * Test to see if the opener of the socket we received the message |
| 1322 | * from had when the netlink socket was created and the sender of the |
| 1323 | * message has has the capability @cap in the user namespace @user_ns. |
| 1324 | */ |
| 1325 | bool __netlink_ns_capable(const struct netlink_skb_parms *nsp, |
| 1326 | struct user_namespace *user_ns, int cap) |
| 1327 | { |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 1328 | return ((nsp->flags & NETLINK_SKB_DST) || |
| 1329 | file_ns_capable(nsp->sk->sk_socket->file, user_ns, cap)) && |
| 1330 | ns_capable(user_ns, cap); |
Eric W. Biederman | aa4cf94 | 2014-04-23 14:28:03 -0700 | [diff] [blame] | 1331 | } |
| 1332 | EXPORT_SYMBOL(__netlink_ns_capable); |
| 1333 | |
| 1334 | /** |
| 1335 | * netlink_ns_capable - General netlink message capability test |
| 1336 | * @skb: socket buffer holding a netlink command from userspace |
| 1337 | * @user_ns: The user namespace of the capability to use |
| 1338 | * @cap: The capability to use |
| 1339 | * |
| 1340 | * Test to see if the opener of the socket we received the message |
| 1341 | * from had when the netlink socket was created and the sender of the |
| 1342 | * message has has the capability @cap in the user namespace @user_ns. |
| 1343 | */ |
| 1344 | bool netlink_ns_capable(const struct sk_buff *skb, |
| 1345 | struct user_namespace *user_ns, int cap) |
| 1346 | { |
| 1347 | return __netlink_ns_capable(&NETLINK_CB(skb), user_ns, cap); |
| 1348 | } |
| 1349 | EXPORT_SYMBOL(netlink_ns_capable); |
| 1350 | |
| 1351 | /** |
| 1352 | * netlink_capable - Netlink global message capability test |
| 1353 | * @skb: socket buffer holding a netlink command from userspace |
| 1354 | * @cap: The capability to use |
| 1355 | * |
| 1356 | * Test to see if the opener of the socket we received the message |
| 1357 | * from had when the netlink socket was created and the sender of the |
| 1358 | * message has has the capability @cap in all user namespaces. |
| 1359 | */ |
| 1360 | bool netlink_capable(const struct sk_buff *skb, int cap) |
| 1361 | { |
| 1362 | return netlink_ns_capable(skb, &init_user_ns, cap); |
| 1363 | } |
| 1364 | EXPORT_SYMBOL(netlink_capable); |
| 1365 | |
| 1366 | /** |
| 1367 | * netlink_net_capable - Netlink network namespace message capability test |
| 1368 | * @skb: socket buffer holding a netlink command from userspace |
| 1369 | * @cap: The capability to use |
| 1370 | * |
| 1371 | * Test to see if the opener of the socket we received the message |
| 1372 | * from had when the netlink socket was created and the sender of the |
| 1373 | * message has has the capability @cap over the network namespace of |
| 1374 | * the socket we received the message from. |
| 1375 | */ |
| 1376 | bool netlink_net_capable(const struct sk_buff *skb, int cap) |
| 1377 | { |
| 1378 | return netlink_ns_capable(skb, sock_net(skb->sk)->user_ns, cap); |
| 1379 | } |
| 1380 | EXPORT_SYMBOL(netlink_net_capable); |
| 1381 | |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 1382 | static inline int netlink_allowed(const struct socket *sock, unsigned int flag) |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1383 | { |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1384 | return (nl_table[sock->sk->sk_protocol].flags & flag) || |
Eric W. Biederman | df008c9 | 2012-11-16 03:03:07 +0000 | [diff] [blame] | 1385 | ns_capable(sock_net(sock->sk)->user_ns, CAP_NET_ADMIN); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1386 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1388 | static void |
| 1389 | netlink_update_subscriptions(struct sock *sk, unsigned int subscriptions) |
| 1390 | { |
| 1391 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1392 | |
| 1393 | if (nlk->subscriptions && !subscriptions) |
| 1394 | __sk_del_bind_node(sk); |
| 1395 | else if (!nlk->subscriptions && subscriptions) |
| 1396 | sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list); |
| 1397 | nlk->subscriptions = subscriptions; |
| 1398 | } |
| 1399 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1400 | static int netlink_realloc_groups(struct sock *sk) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1401 | { |
| 1402 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1403 | unsigned int groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1404 | unsigned long *new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1405 | int err = 0; |
| 1406 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1407 | netlink_table_grab(); |
| 1408 | |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1409 | groups = nl_table[sk->sk_protocol].groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1410 | if (!nl_table[sk->sk_protocol].registered) { |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1411 | err = -ENOENT; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1412 | goto out_unlock; |
| 1413 | } |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1414 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1415 | if (nlk->ngroups >= groups) |
| 1416 | goto out_unlock; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1417 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1418 | new_groups = krealloc(nlk->groups, NLGRPSZ(groups), GFP_ATOMIC); |
| 1419 | if (new_groups == NULL) { |
| 1420 | err = -ENOMEM; |
| 1421 | goto out_unlock; |
| 1422 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1423 | memset((char *)new_groups + NLGRPSZ(nlk->ngroups), 0, |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1424 | NLGRPSZ(groups) - NLGRPSZ(nlk->ngroups)); |
| 1425 | |
| 1426 | nlk->groups = new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1427 | nlk->ngroups = groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1428 | out_unlock: |
| 1429 | netlink_table_ungrab(); |
| 1430 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1431 | } |
| 1432 | |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1433 | static void netlink_unbind(int group, long unsigned int groups, |
| 1434 | struct netlink_sock *nlk) |
| 1435 | { |
| 1436 | int undo; |
| 1437 | |
| 1438 | if (!nlk->netlink_unbind) |
| 1439 | return; |
| 1440 | |
| 1441 | for (undo = 0; undo < group; undo++) |
Hiroaki SHIMODA | 6251edd | 2014-11-13 04:24:10 +0900 | [diff] [blame] | 1442 | if (test_bit(undo, &groups)) |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1443 | nlk->netlink_unbind(undo); |
| 1444 | } |
| 1445 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1446 | static int netlink_bind(struct socket *sock, struct sockaddr *addr, |
| 1447 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | { |
| 1449 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1450 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1452 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
| 1453 | int err; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1454 | long unsigned int groups = nladdr->nl_groups; |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1455 | |
Hannes Frederic Sowa | 4e4b537 | 2012-12-15 15:42:19 +0000 | [diff] [blame] | 1456 | if (addr_len < sizeof(struct sockaddr_nl)) |
| 1457 | return -EINVAL; |
| 1458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | if (nladdr->nl_family != AF_NETLINK) |
| 1460 | return -EINVAL; |
| 1461 | |
| 1462 | /* Only superuser is allowed to listen multicasts */ |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1463 | if (groups) { |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 1464 | if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV)) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1465 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1466 | err = netlink_realloc_groups(sk); |
| 1467 | if (err) |
| 1468 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1469 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1471 | if (nlk->portid) |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1472 | if (nladdr->nl_pid != nlk->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | return -EINVAL; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1474 | |
| 1475 | if (nlk->netlink_bind && groups) { |
| 1476 | int group; |
| 1477 | |
| 1478 | for (group = 0; group < nlk->ngroups; group++) { |
| 1479 | if (!test_bit(group, &groups)) |
| 1480 | continue; |
| 1481 | err = nlk->netlink_bind(group); |
| 1482 | if (!err) |
| 1483 | continue; |
| 1484 | netlink_unbind(group, groups, nlk); |
| 1485 | return err; |
| 1486 | } |
| 1487 | } |
| 1488 | |
| 1489 | if (!nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | err = nladdr->nl_pid ? |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1491 | netlink_insert(sk, net, nladdr->nl_pid) : |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | netlink_autobind(sock); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1493 | if (err) { |
Hiroaki SHIMODA | 6251edd | 2014-11-13 04:24:10 +0900 | [diff] [blame] | 1494 | netlink_unbind(nlk->ngroups, groups, nlk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | return err; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1496 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | } |
| 1498 | |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1499 | if (!groups && (nlk->groups == NULL || !(u32)nlk->groups[0])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | return 0; |
| 1501 | |
| 1502 | netlink_table_grab(); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1503 | netlink_update_subscriptions(sk, nlk->subscriptions + |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1504 | hweight32(groups) - |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1505 | hweight32(nlk->groups[0])); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1506 | nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1507 | netlink_update_listeners(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | netlink_table_ungrab(); |
| 1509 | |
| 1510 | return 0; |
| 1511 | } |
| 1512 | |
| 1513 | static int netlink_connect(struct socket *sock, struct sockaddr *addr, |
| 1514 | int alen, int flags) |
| 1515 | { |
| 1516 | int err = 0; |
| 1517 | struct sock *sk = sock->sk; |
| 1518 | struct netlink_sock *nlk = nlk_sk(sk); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1519 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | |
Changli Gao | 6503d96 | 2010-03-31 22:58:26 +0000 | [diff] [blame] | 1521 | if (alen < sizeof(addr->sa_family)) |
| 1522 | return -EINVAL; |
| 1523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | if (addr->sa_family == AF_UNSPEC) { |
| 1525 | sk->sk_state = NETLINK_UNCONNECTED; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1526 | nlk->dst_portid = 0; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1527 | nlk->dst_group = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | return 0; |
| 1529 | } |
| 1530 | if (addr->sa_family != AF_NETLINK) |
| 1531 | return -EINVAL; |
| 1532 | |
Mike Pecovnik | 46833a8 | 2014-02-24 21:11:16 +0100 | [diff] [blame] | 1533 | if ((nladdr->nl_groups || nladdr->nl_pid) && |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 1534 | !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | return -EPERM; |
| 1536 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1537 | if (!nlk->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | err = netlink_autobind(sock); |
| 1539 | |
| 1540 | if (err == 0) { |
| 1541 | sk->sk_state = NETLINK_CONNECTED; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1542 | nlk->dst_portid = nladdr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1543 | nlk->dst_group = ffs(nladdr->nl_groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | } |
| 1545 | |
| 1546 | return err; |
| 1547 | } |
| 1548 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1549 | static int netlink_getname(struct socket *sock, struct sockaddr *addr, |
| 1550 | int *addr_len, int peer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | { |
| 1552 | struct sock *sk = sock->sk; |
| 1553 | struct netlink_sock *nlk = nlk_sk(sk); |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 1554 | DECLARE_SOCKADDR(struct sockaddr_nl *, nladdr, addr); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1555 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | nladdr->nl_family = AF_NETLINK; |
| 1557 | nladdr->nl_pad = 0; |
| 1558 | *addr_len = sizeof(*nladdr); |
| 1559 | |
| 1560 | if (peer) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1561 | nladdr->nl_pid = nlk->dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1562 | nladdr->nl_groups = netlink_group_mask(nlk->dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | } else { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1564 | nladdr->nl_pid = nlk->portid; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1565 | nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | } |
| 1567 | return 0; |
| 1568 | } |
| 1569 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1570 | static struct sock *netlink_getsockbyportid(struct sock *ssk, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | struct sock *sock; |
| 1573 | struct netlink_sock *nlk; |
| 1574 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1575 | sock = netlink_lookup(sock_net(ssk), ssk->sk_protocol, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | if (!sock) |
| 1577 | return ERR_PTR(-ECONNREFUSED); |
| 1578 | |
| 1579 | /* Don't bother queuing skb if kernel socket has no input function */ |
| 1580 | nlk = nlk_sk(sock); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1581 | if (sock->sk_state == NETLINK_CONNECTED && |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1582 | nlk->dst_portid != nlk_sk(ssk)->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | sock_put(sock); |
| 1584 | return ERR_PTR(-ECONNREFUSED); |
| 1585 | } |
| 1586 | return sock; |
| 1587 | } |
| 1588 | |
| 1589 | struct sock *netlink_getsockbyfilp(struct file *filp) |
| 1590 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1591 | struct inode *inode = file_inode(filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | struct sock *sock; |
| 1593 | |
| 1594 | if (!S_ISSOCK(inode->i_mode)) |
| 1595 | return ERR_PTR(-ENOTSOCK); |
| 1596 | |
| 1597 | sock = SOCKET_I(inode)->sk; |
| 1598 | if (sock->sk_family != AF_NETLINK) |
| 1599 | return ERR_PTR(-EINVAL); |
| 1600 | |
| 1601 | sock_hold(sock); |
| 1602 | return sock; |
| 1603 | } |
| 1604 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1605 | static struct sk_buff *netlink_alloc_large_skb(unsigned int size, |
| 1606 | int broadcast) |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1607 | { |
| 1608 | struct sk_buff *skb; |
| 1609 | void *data; |
| 1610 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1611 | if (size <= NLMSG_GOODSIZE || broadcast) |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1612 | return alloc_skb(size, GFP_KERNEL); |
| 1613 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1614 | size = SKB_DATA_ALIGN(size) + |
| 1615 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1616 | |
| 1617 | data = vmalloc(size); |
| 1618 | if (data == NULL) |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1619 | return NULL; |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1620 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1621 | skb = build_skb(data, size); |
| 1622 | if (skb == NULL) |
| 1623 | vfree(data); |
| 1624 | else { |
| 1625 | skb->head_frag = 0; |
| 1626 | skb->destructor = netlink_skb_destructor; |
| 1627 | } |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1628 | |
| 1629 | return skb; |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1630 | } |
| 1631 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | /* |
| 1633 | * Attach a skb to a netlink socket. |
| 1634 | * The caller must hold a reference to the destination socket. On error, the |
| 1635 | * reference is dropped. The skb is not send to the destination, just all |
| 1636 | * all error checks are performed and memory in the queue is reserved. |
| 1637 | * Return values: |
| 1638 | * < 0: error. skb freed, reference to sock dropped. |
| 1639 | * 0: continue |
| 1640 | * 1: repeat lookup - reference dropped while waiting for socket memory. |
| 1641 | */ |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1642 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1643 | long *timeo, struct sock *ssk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | { |
| 1645 | struct netlink_sock *nlk; |
| 1646 | |
| 1647 | nlk = nlk_sk(sk); |
| 1648 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 1649 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
| 1650 | test_bit(NETLINK_CONGESTED, &nlk->state)) && |
| 1651 | !netlink_skb_is_mmaped(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | DECLARE_WAITQUEUE(wait, current); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1653 | if (!*timeo) { |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1654 | if (!ssk || netlink_is_kernel(ssk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | netlink_overrun(sk); |
| 1656 | sock_put(sk); |
| 1657 | kfree_skb(skb); |
| 1658 | return -EAGAIN; |
| 1659 | } |
| 1660 | |
| 1661 | __set_current_state(TASK_INTERRUPTIBLE); |
| 1662 | add_wait_queue(&nlk->wait, &wait); |
| 1663 | |
| 1664 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1665 | test_bit(NETLINK_CONGESTED, &nlk->state)) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | !sock_flag(sk, SOCK_DEAD)) |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1667 | *timeo = schedule_timeout(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | |
| 1669 | __set_current_state(TASK_RUNNING); |
| 1670 | remove_wait_queue(&nlk->wait, &wait); |
| 1671 | sock_put(sk); |
| 1672 | |
| 1673 | if (signal_pending(current)) { |
| 1674 | kfree_skb(skb); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1675 | return sock_intr_errno(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | } |
| 1677 | return 1; |
| 1678 | } |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1679 | netlink_skb_set_owner_r(skb, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | return 0; |
| 1681 | } |
| 1682 | |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1683 | static int __netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | int len = skb->len; |
| 1686 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 1687 | netlink_deliver_tap(skb); |
| 1688 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1689 | #ifdef CONFIG_NETLINK_MMAP |
| 1690 | if (netlink_skb_is_mmaped(skb)) |
| 1691 | netlink_queue_mmaped_skb(sk, skb); |
| 1692 | else if (netlink_rx_is_mmaped(sk)) |
| 1693 | netlink_ring_set_copied(sk, skb); |
| 1694 | else |
| 1695 | #endif /* CONFIG_NETLINK_MMAP */ |
| 1696 | skb_queue_tail(&sk->sk_receive_queue, skb); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 1697 | sk->sk_data_ready(sk); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1698 | return len; |
| 1699 | } |
| 1700 | |
| 1701 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
| 1702 | { |
| 1703 | int len = __netlink_sendskb(sk, skb); |
| 1704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | sock_put(sk); |
| 1706 | return len; |
| 1707 | } |
| 1708 | |
| 1709 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb) |
| 1710 | { |
| 1711 | kfree_skb(skb); |
| 1712 | sock_put(sk); |
| 1713 | } |
| 1714 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1715 | static struct sk_buff *netlink_trim(struct sk_buff *skb, gfp_t allocation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | { |
| 1717 | int delta; |
| 1718 | |
Patrick McHardy | 1298ca4 | 2013-04-17 06:46:59 +0000 | [diff] [blame] | 1719 | WARN_ON(skb->sk != NULL); |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 1720 | if (netlink_skb_is_mmaped(skb)) |
| 1721 | return skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 1723 | delta = skb->end - skb->tail; |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1724 | if (is_vmalloc_addr(skb->head) || delta * 2 < skb->truesize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | return skb; |
| 1726 | |
| 1727 | if (skb_shared(skb)) { |
| 1728 | struct sk_buff *nskb = skb_clone(skb, allocation); |
| 1729 | if (!nskb) |
| 1730 | return skb; |
Eric Dumazet | 8460c00 | 2012-04-19 02:24:28 +0000 | [diff] [blame] | 1731 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | skb = nskb; |
| 1733 | } |
| 1734 | |
| 1735 | if (!pskb_expand_head(skb, 0, -delta, allocation)) |
| 1736 | skb->truesize -= delta; |
| 1737 | |
| 1738 | return skb; |
| 1739 | } |
| 1740 | |
Eric W. Biederman | 3fbc290 | 2012-05-24 17:21:27 -0600 | [diff] [blame] | 1741 | static int netlink_unicast_kernel(struct sock *sk, struct sk_buff *skb, |
| 1742 | struct sock *ssk) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1743 | { |
| 1744 | int ret; |
| 1745 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1746 | |
| 1747 | ret = -ECONNREFUSED; |
| 1748 | if (nlk->netlink_rcv != NULL) { |
| 1749 | ret = skb->len; |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1750 | netlink_skb_set_owner_r(skb, sk); |
Patrick McHardy | e32123e | 2013-04-17 06:46:57 +0000 | [diff] [blame] | 1751 | NETLINK_CB(skb).sk = ssk; |
Daniel Borkmann | 73bfd37 | 2013-12-23 14:35:55 +0100 | [diff] [blame] | 1752 | netlink_deliver_tap_kernel(sk, ssk, skb); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1753 | nlk->netlink_rcv(skb); |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 1754 | consume_skb(skb); |
| 1755 | } else { |
| 1756 | kfree_skb(skb); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1757 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1758 | sock_put(sk); |
| 1759 | return ret; |
| 1760 | } |
| 1761 | |
| 1762 | int netlink_unicast(struct sock *ssk, struct sk_buff *skb, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1763 | u32 portid, int nonblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | { |
| 1765 | struct sock *sk; |
| 1766 | int err; |
| 1767 | long timeo; |
| 1768 | |
| 1769 | skb = netlink_trim(skb, gfp_any()); |
| 1770 | |
| 1771 | timeo = sock_sndtimeo(ssk, nonblock); |
| 1772 | retry: |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1773 | sk = netlink_getsockbyportid(ssk, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | if (IS_ERR(sk)) { |
| 1775 | kfree_skb(skb); |
| 1776 | return PTR_ERR(sk); |
| 1777 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1778 | if (netlink_is_kernel(sk)) |
Eric W. Biederman | 3fbc290 | 2012-05-24 17:21:27 -0600 | [diff] [blame] | 1779 | return netlink_unicast_kernel(sk, skb, ssk); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1780 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1781 | if (sk_filter(sk, skb)) { |
Wang Chen | 8487460 | 2008-07-01 19:55:09 -0700 | [diff] [blame] | 1782 | err = skb->len; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1783 | kfree_skb(skb); |
| 1784 | sock_put(sk); |
| 1785 | return err; |
| 1786 | } |
| 1787 | |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1788 | err = netlink_attachskb(sk, skb, &timeo, ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | if (err == 1) |
| 1790 | goto retry; |
| 1791 | if (err) |
| 1792 | return err; |
| 1793 | |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 1794 | return netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1796 | EXPORT_SYMBOL(netlink_unicast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1798 | struct sk_buff *netlink_alloc_skb(struct sock *ssk, unsigned int size, |
| 1799 | u32 dst_portid, gfp_t gfp_mask) |
| 1800 | { |
| 1801 | #ifdef CONFIG_NETLINK_MMAP |
| 1802 | struct sock *sk = NULL; |
| 1803 | struct sk_buff *skb; |
| 1804 | struct netlink_ring *ring; |
| 1805 | struct nl_mmap_hdr *hdr; |
| 1806 | unsigned int maxlen; |
| 1807 | |
| 1808 | sk = netlink_getsockbyportid(ssk, dst_portid); |
| 1809 | if (IS_ERR(sk)) |
| 1810 | goto out; |
| 1811 | |
| 1812 | ring = &nlk_sk(sk)->rx_ring; |
| 1813 | /* fast-path without atomic ops for common case: non-mmaped receiver */ |
| 1814 | if (ring->pg_vec == NULL) |
| 1815 | goto out_put; |
| 1816 | |
Thomas Graf | aae9f0e | 2013-11-30 13:21:31 +0100 | [diff] [blame] | 1817 | if (ring->frame_size - NL_MMAP_HDRLEN < size) |
| 1818 | goto out_put; |
| 1819 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1820 | skb = alloc_skb_head(gfp_mask); |
| 1821 | if (skb == NULL) |
| 1822 | goto err1; |
| 1823 | |
| 1824 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 1825 | /* check again under lock */ |
| 1826 | if (ring->pg_vec == NULL) |
| 1827 | goto out_free; |
| 1828 | |
Thomas Graf | aae9f0e | 2013-11-30 13:21:31 +0100 | [diff] [blame] | 1829 | /* check again under lock */ |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1830 | maxlen = ring->frame_size - NL_MMAP_HDRLEN; |
| 1831 | if (maxlen < size) |
| 1832 | goto out_free; |
| 1833 | |
| 1834 | netlink_forward_ring(ring); |
| 1835 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED); |
| 1836 | if (hdr == NULL) |
| 1837 | goto err2; |
| 1838 | netlink_ring_setup_skb(skb, sk, ring, hdr); |
| 1839 | netlink_set_status(hdr, NL_MMAP_STATUS_RESERVED); |
| 1840 | atomic_inc(&ring->pending); |
| 1841 | netlink_increment_head(ring); |
| 1842 | |
| 1843 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1844 | return skb; |
| 1845 | |
| 1846 | err2: |
| 1847 | kfree_skb(skb); |
| 1848 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 1849 | netlink_overrun(sk); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1850 | err1: |
| 1851 | sock_put(sk); |
| 1852 | return NULL; |
| 1853 | |
| 1854 | out_free: |
| 1855 | kfree_skb(skb); |
| 1856 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1857 | out_put: |
| 1858 | sock_put(sk); |
| 1859 | out: |
| 1860 | #endif |
| 1861 | return alloc_skb(size, gfp_mask); |
| 1862 | } |
| 1863 | EXPORT_SYMBOL_GPL(netlink_alloc_skb); |
| 1864 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1865 | int netlink_has_listeners(struct sock *sk, unsigned int group) |
| 1866 | { |
| 1867 | int res = 0; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1868 | struct listeners *listeners; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1869 | |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1870 | BUG_ON(!netlink_is_kernel(sk)); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1871 | |
| 1872 | rcu_read_lock(); |
| 1873 | listeners = rcu_dereference(nl_table[sk->sk_protocol].listeners); |
| 1874 | |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1875 | if (listeners && group - 1 < nl_table[sk->sk_protocol].groups) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1876 | res = test_bit(group - 1, listeners->masks); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1877 | |
| 1878 | rcu_read_unlock(); |
| 1879 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1880 | return res; |
| 1881 | } |
| 1882 | EXPORT_SYMBOL_GPL(netlink_has_listeners); |
| 1883 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1884 | static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | { |
| 1886 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1887 | |
| 1888 | if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf && |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1889 | !test_bit(NETLINK_CONGESTED, &nlk->state)) { |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1890 | netlink_skb_set_owner_r(skb, sk); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1891 | __netlink_sendskb(sk, skb); |
stephen hemminger | 2c645800 | 2011-12-22 08:52:03 +0000 | [diff] [blame] | 1892 | return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | } |
| 1894 | return -1; |
| 1895 | } |
| 1896 | |
| 1897 | struct netlink_broadcast_data { |
| 1898 | struct sock *exclude_sk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1899 | struct net *net; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1900 | u32 portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | u32 group; |
| 1902 | int failure; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1903 | int delivery_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | int congested; |
| 1905 | int delivered; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 1906 | gfp_t allocation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | struct sk_buff *skb, *skb2; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1908 | int (*tx_filter)(struct sock *dsk, struct sk_buff *skb, void *data); |
| 1909 | void *tx_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | }; |
| 1911 | |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1912 | static void do_one_broadcast(struct sock *sk, |
| 1913 | struct netlink_broadcast_data *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | { |
| 1915 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1916 | int val; |
| 1917 | |
| 1918 | if (p->exclude_sk == sk) |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1919 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1921 | if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups || |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1922 | !test_bit(p->group - 1, nlk->groups)) |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1923 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1925 | if (!net_eq(sock_net(sk), p->net)) |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1926 | return; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1927 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1928 | if (p->failure) { |
| 1929 | netlink_overrun(sk); |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1930 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | } |
| 1932 | |
| 1933 | sock_hold(sk); |
| 1934 | if (p->skb2 == NULL) { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1935 | if (skb_shared(p->skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | p->skb2 = skb_clone(p->skb, p->allocation); |
| 1937 | } else { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1938 | p->skb2 = skb_get(p->skb); |
| 1939 | /* |
| 1940 | * skb ownership may have been set when |
| 1941 | * delivered to a previous socket. |
| 1942 | */ |
| 1943 | skb_orphan(p->skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1944 | } |
| 1945 | } |
| 1946 | if (p->skb2 == NULL) { |
| 1947 | netlink_overrun(sk); |
| 1948 | /* Clone failed. Notify ALL listeners. */ |
| 1949 | p->failure = 1; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1950 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1951 | p->delivery_failure = 1; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1952 | } else if (p->tx_filter && p->tx_filter(sk, p->skb2, p->tx_data)) { |
| 1953 | kfree_skb(p->skb2); |
| 1954 | p->skb2 = NULL; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1955 | } else if (sk_filter(sk, p->skb2)) { |
| 1956 | kfree_skb(p->skb2); |
| 1957 | p->skb2 = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | } else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) { |
| 1959 | netlink_overrun(sk); |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1960 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1961 | p->delivery_failure = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | } else { |
| 1963 | p->congested |= val; |
| 1964 | p->delivered = 1; |
| 1965 | p->skb2 = NULL; |
| 1966 | } |
| 1967 | sock_put(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | } |
| 1969 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1970 | int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, u32 portid, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1971 | u32 group, gfp_t allocation, |
| 1972 | int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), |
| 1973 | void *filter_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1975 | struct net *net = sock_net(ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | struct netlink_broadcast_data info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | struct sock *sk; |
| 1978 | |
| 1979 | skb = netlink_trim(skb, allocation); |
| 1980 | |
| 1981 | info.exclude_sk = ssk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1982 | info.net = net; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1983 | info.portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1984 | info.group = group; |
| 1985 | info.failure = 0; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1986 | info.delivery_failure = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | info.congested = 0; |
| 1988 | info.delivered = 0; |
| 1989 | info.allocation = allocation; |
| 1990 | info.skb = skb; |
| 1991 | info.skb2 = NULL; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1992 | info.tx_filter = filter; |
| 1993 | info.tx_data = filter_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | |
| 1995 | /* While we sleep in clone, do not allow to change socket list */ |
| 1996 | |
| 1997 | netlink_lock_table(); |
| 1998 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1999 | sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | do_one_broadcast(sk, &info); |
| 2001 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 2002 | consume_skb(skb); |
Tommy S. Christensen | aa1c6a6 | 2005-05-19 13:07:32 -0700 | [diff] [blame] | 2003 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2004 | netlink_unlock_table(); |
| 2005 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 2006 | if (info.delivery_failure) { |
| 2007 | kfree_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 2008 | return -ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2009 | } |
| 2010 | consume_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 2011 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | if (info.delivered) { |
| 2013 | if (info.congested && (allocation & __GFP_WAIT)) |
| 2014 | yield(); |
| 2015 | return 0; |
| 2016 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | return -ESRCH; |
| 2018 | } |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 2019 | EXPORT_SYMBOL(netlink_broadcast_filtered); |
| 2020 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2021 | int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 portid, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 2022 | u32 group, gfp_t allocation) |
| 2023 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2024 | return netlink_broadcast_filtered(ssk, skb, portid, group, allocation, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 2025 | NULL, NULL); |
| 2026 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2027 | EXPORT_SYMBOL(netlink_broadcast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | |
| 2029 | struct netlink_set_err_data { |
| 2030 | struct sock *exclude_sk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2031 | u32 portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | u32 group; |
| 2033 | int code; |
| 2034 | }; |
| 2035 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 2036 | static int do_one_set_err(struct sock *sk, struct netlink_set_err_data *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | { |
| 2038 | struct netlink_sock *nlk = nlk_sk(sk); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2039 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | |
| 2041 | if (sk == p->exclude_sk) |
| 2042 | goto out; |
| 2043 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 2044 | if (!net_eq(sock_net(sk), sock_net(p->exclude_sk))) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2045 | goto out; |
| 2046 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2047 | if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups || |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 2048 | !test_bit(p->group - 1, nlk->groups)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | goto out; |
| 2050 | |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2051 | if (p->code == ENOBUFS && nlk->flags & NETLINK_RECV_NO_ENOBUFS) { |
| 2052 | ret = 1; |
| 2053 | goto out; |
| 2054 | } |
| 2055 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | sk->sk_err = p->code; |
| 2057 | sk->sk_error_report(sk); |
| 2058 | out: |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2059 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | } |
| 2061 | |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2062 | /** |
| 2063 | * netlink_set_err - report error to broadcast listeners |
| 2064 | * @ssk: the kernel netlink socket, as returned by netlink_kernel_create() |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2065 | * @portid: the PORTID of a process that we want to skip (if any) |
Johannes Berg | 840e93f2 | 2013-11-19 10:35:40 +0100 | [diff] [blame] | 2066 | * @group: the broadcast group that will notice the error |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2067 | * @code: error code, must be negative (as usual in kernelspace) |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2068 | * |
| 2069 | * This function returns the number of broadcast listeners that have set the |
| 2070 | * NETLINK_RECV_NO_ENOBUFS socket option. |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2071 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2072 | int netlink_set_err(struct sock *ssk, u32 portid, u32 group, int code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | { |
| 2074 | struct netlink_set_err_data info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | struct sock *sk; |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2076 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2077 | |
| 2078 | info.exclude_sk = ssk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2079 | info.portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2080 | info.group = group; |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2081 | /* sk->sk_err wants a positive error value */ |
| 2082 | info.code = -code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | |
| 2084 | read_lock(&nl_table_lock); |
| 2085 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2086 | sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list) |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2087 | ret += do_one_set_err(sk, &info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | |
| 2089 | read_unlock(&nl_table_lock); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2090 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2091 | } |
Pablo Neira Ayuso | dd5b6ce | 2009-03-23 13:21:06 +0100 | [diff] [blame] | 2092 | EXPORT_SYMBOL(netlink_set_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 2094 | /* must be called with netlink table grabbed */ |
| 2095 | static void netlink_update_socket_mc(struct netlink_sock *nlk, |
| 2096 | unsigned int group, |
| 2097 | int is_new) |
| 2098 | { |
| 2099 | int old, new = !!is_new, subscriptions; |
| 2100 | |
| 2101 | old = test_bit(group - 1, nlk->groups); |
| 2102 | subscriptions = nlk->subscriptions - old + new; |
| 2103 | if (new) |
| 2104 | __set_bit(group - 1, nlk->groups); |
| 2105 | else |
| 2106 | __clear_bit(group - 1, nlk->groups); |
| 2107 | netlink_update_subscriptions(&nlk->sk, subscriptions); |
| 2108 | netlink_update_listeners(&nlk->sk); |
| 2109 | } |
| 2110 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2111 | static int netlink_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2112 | char __user *optval, unsigned int optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2113 | { |
| 2114 | struct sock *sk = sock->sk; |
| 2115 | struct netlink_sock *nlk = nlk_sk(sk); |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 2116 | unsigned int val = 0; |
| 2117 | int err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2118 | |
| 2119 | if (level != SOL_NETLINK) |
| 2120 | return -ENOPROTOOPT; |
| 2121 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 2122 | if (optname != NETLINK_RX_RING && optname != NETLINK_TX_RING && |
| 2123 | optlen >= sizeof(int) && |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 2124 | get_user(val, (unsigned int __user *)optval)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2125 | return -EFAULT; |
| 2126 | |
| 2127 | switch (optname) { |
| 2128 | case NETLINK_PKTINFO: |
| 2129 | if (val) |
| 2130 | nlk->flags |= NETLINK_RECV_PKTINFO; |
| 2131 | else |
| 2132 | nlk->flags &= ~NETLINK_RECV_PKTINFO; |
| 2133 | err = 0; |
| 2134 | break; |
| 2135 | case NETLINK_ADD_MEMBERSHIP: |
| 2136 | case NETLINK_DROP_MEMBERSHIP: { |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 2137 | if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2138 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2139 | err = netlink_realloc_groups(sk); |
| 2140 | if (err) |
| 2141 | return err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2142 | if (!val || val - 1 >= nlk->ngroups) |
| 2143 | return -EINVAL; |
Richard Guy Briggs | 7774d5e | 2014-04-22 21:31:55 -0400 | [diff] [blame] | 2144 | if (optname == NETLINK_ADD_MEMBERSHIP && nlk->netlink_bind) { |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 2145 | err = nlk->netlink_bind(val); |
| 2146 | if (err) |
| 2147 | return err; |
| 2148 | } |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2149 | netlink_table_grab(); |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 2150 | netlink_update_socket_mc(nlk, val, |
| 2151 | optname == NETLINK_ADD_MEMBERSHIP); |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2152 | netlink_table_ungrab(); |
Richard Guy Briggs | 7774d5e | 2014-04-22 21:31:55 -0400 | [diff] [blame] | 2153 | if (optname == NETLINK_DROP_MEMBERSHIP && nlk->netlink_unbind) |
| 2154 | nlk->netlink_unbind(val); |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 2155 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2156 | err = 0; |
| 2157 | break; |
| 2158 | } |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 2159 | case NETLINK_BROADCAST_ERROR: |
| 2160 | if (val) |
| 2161 | nlk->flags |= NETLINK_BROADCAST_SEND_ERROR; |
| 2162 | else |
| 2163 | nlk->flags &= ~NETLINK_BROADCAST_SEND_ERROR; |
| 2164 | err = 0; |
| 2165 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2166 | case NETLINK_NO_ENOBUFS: |
| 2167 | if (val) { |
| 2168 | nlk->flags |= NETLINK_RECV_NO_ENOBUFS; |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 2169 | clear_bit(NETLINK_CONGESTED, &nlk->state); |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2170 | wake_up_interruptible(&nlk->wait); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2171 | } else { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2172 | nlk->flags &= ~NETLINK_RECV_NO_ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2173 | } |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2174 | err = 0; |
| 2175 | break; |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 2176 | #ifdef CONFIG_NETLINK_MMAP |
| 2177 | case NETLINK_RX_RING: |
| 2178 | case NETLINK_TX_RING: { |
| 2179 | struct nl_mmap_req req; |
| 2180 | |
| 2181 | /* Rings might consume more memory than queue limits, require |
| 2182 | * CAP_NET_ADMIN. |
| 2183 | */ |
| 2184 | if (!capable(CAP_NET_ADMIN)) |
| 2185 | return -EPERM; |
| 2186 | if (optlen < sizeof(req)) |
| 2187 | return -EINVAL; |
| 2188 | if (copy_from_user(&req, optval, sizeof(req))) |
| 2189 | return -EFAULT; |
| 2190 | err = netlink_set_ring(sk, &req, false, |
| 2191 | optname == NETLINK_TX_RING); |
| 2192 | break; |
| 2193 | } |
| 2194 | #endif /* CONFIG_NETLINK_MMAP */ |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2195 | default: |
| 2196 | err = -ENOPROTOOPT; |
| 2197 | } |
| 2198 | return err; |
| 2199 | } |
| 2200 | |
| 2201 | static int netlink_getsockopt(struct socket *sock, int level, int optname, |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2202 | char __user *optval, int __user *optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2203 | { |
| 2204 | struct sock *sk = sock->sk; |
| 2205 | struct netlink_sock *nlk = nlk_sk(sk); |
| 2206 | int len, val, err; |
| 2207 | |
| 2208 | if (level != SOL_NETLINK) |
| 2209 | return -ENOPROTOOPT; |
| 2210 | |
| 2211 | if (get_user(len, optlen)) |
| 2212 | return -EFAULT; |
| 2213 | if (len < 0) |
| 2214 | return -EINVAL; |
| 2215 | |
| 2216 | switch (optname) { |
| 2217 | case NETLINK_PKTINFO: |
| 2218 | if (len < sizeof(int)) |
| 2219 | return -EINVAL; |
| 2220 | len = sizeof(int); |
| 2221 | val = nlk->flags & NETLINK_RECV_PKTINFO ? 1 : 0; |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 2222 | if (put_user(len, optlen) || |
| 2223 | put_user(val, optval)) |
| 2224 | return -EFAULT; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2225 | err = 0; |
| 2226 | break; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 2227 | case NETLINK_BROADCAST_ERROR: |
| 2228 | if (len < sizeof(int)) |
| 2229 | return -EINVAL; |
| 2230 | len = sizeof(int); |
| 2231 | val = nlk->flags & NETLINK_BROADCAST_SEND_ERROR ? 1 : 0; |
| 2232 | if (put_user(len, optlen) || |
| 2233 | put_user(val, optval)) |
| 2234 | return -EFAULT; |
| 2235 | err = 0; |
| 2236 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2237 | case NETLINK_NO_ENOBUFS: |
| 2238 | if (len < sizeof(int)) |
| 2239 | return -EINVAL; |
| 2240 | len = sizeof(int); |
| 2241 | val = nlk->flags & NETLINK_RECV_NO_ENOBUFS ? 1 : 0; |
| 2242 | if (put_user(len, optlen) || |
| 2243 | put_user(val, optval)) |
| 2244 | return -EFAULT; |
| 2245 | err = 0; |
| 2246 | break; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2247 | default: |
| 2248 | err = -ENOPROTOOPT; |
| 2249 | } |
| 2250 | return err; |
| 2251 | } |
| 2252 | |
| 2253 | static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
| 2254 | { |
| 2255 | struct nl_pktinfo info; |
| 2256 | |
| 2257 | info.group = NETLINK_CB(skb).dst_group; |
| 2258 | put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info); |
| 2259 | } |
| 2260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock, |
| 2262 | struct msghdr *msg, size_t len) |
| 2263 | { |
| 2264 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 2265 | struct sock *sk = sock->sk; |
| 2266 | struct netlink_sock *nlk = nlk_sk(sk); |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2267 | DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2268 | u32 dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2269 | u32 dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | struct sk_buff *skb; |
| 2271 | int err; |
| 2272 | struct scm_cookie scm; |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 2273 | u32 netlink_skb_flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2274 | |
| 2275 | if (msg->msg_flags&MSG_OOB) |
| 2276 | return -EOPNOTSUPP; |
| 2277 | |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 2278 | if (NULL == siocb->scm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | siocb->scm = &scm; |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 2280 | |
Eric Dumazet | e0e3cea | 2012-08-21 06:21:17 +0000 | [diff] [blame] | 2281 | err = scm_send(sock, msg, siocb->scm, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | if (err < 0) |
| 2283 | return err; |
| 2284 | |
| 2285 | if (msg->msg_namelen) { |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2286 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | if (addr->nl_family != AF_NETLINK) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2288 | goto out; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2289 | dst_portid = addr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2290 | dst_group = ffs(addr->nl_groups); |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2291 | err = -EPERM; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2292 | if ((dst_group || dst_portid) && |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 2293 | !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND)) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2294 | goto out; |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 2295 | netlink_skb_flags |= NETLINK_SKB_DST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2296 | } else { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2297 | dst_portid = nlk->dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2298 | dst_group = nlk->dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | } |
| 2300 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2301 | if (!nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | err = netlink_autobind(sock); |
| 2303 | if (err) |
| 2304 | goto out; |
| 2305 | } |
| 2306 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 2307 | if (netlink_tx_is_mmaped(sk) && |
Al Viro | c0371da | 2014-11-24 10:42:55 -0500 | [diff] [blame] | 2308 | msg->msg_iter.iov->iov_base == NULL) { |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 2309 | err = netlink_mmap_sendmsg(sk, msg, dst_portid, dst_group, |
| 2310 | siocb); |
| 2311 | goto out; |
| 2312 | } |
| 2313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2314 | err = -EMSGSIZE; |
| 2315 | if (len > sk->sk_sndbuf - 32) |
| 2316 | goto out; |
| 2317 | err = -ENOBUFS; |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 2318 | skb = netlink_alloc_large_skb(len, dst_group); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2319 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | goto out; |
| 2321 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2322 | NETLINK_CB(skb).portid = nlk->portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2323 | NETLINK_CB(skb).dst_group = dst_group; |
Eric W. Biederman | dbe9a41 | 2012-09-06 18:20:01 +0000 | [diff] [blame] | 2324 | NETLINK_CB(skb).creds = siocb->scm->creds; |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 2325 | NETLINK_CB(skb).flags = netlink_skb_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | err = -EFAULT; |
Al Viro | 6ce8e9c | 2014-04-06 21:25:44 -0400 | [diff] [blame] | 2328 | if (memcpy_from_msg(skb_put(skb, len), msg, len)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2329 | kfree_skb(skb); |
| 2330 | goto out; |
| 2331 | } |
| 2332 | |
| 2333 | err = security_netlink_send(sk, skb); |
| 2334 | if (err) { |
| 2335 | kfree_skb(skb); |
| 2336 | goto out; |
| 2337 | } |
| 2338 | |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2339 | if (dst_group) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | atomic_inc(&skb->users); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2341 | netlink_broadcast(sk, skb, dst_portid, dst_group, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2343 | err = netlink_unicast(sk, skb, dst_portid, msg->msg_flags&MSG_DONTWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2344 | |
| 2345 | out: |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2346 | scm_destroy(siocb->scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2347 | return err; |
| 2348 | } |
| 2349 | |
| 2350 | static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock, |
| 2351 | struct msghdr *msg, size_t len, |
| 2352 | int flags) |
| 2353 | { |
| 2354 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 2355 | struct scm_cookie scm; |
| 2356 | struct sock *sk = sock->sk; |
| 2357 | struct netlink_sock *nlk = nlk_sk(sk); |
| 2358 | int noblock = flags&MSG_DONTWAIT; |
| 2359 | size_t copied; |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2360 | struct sk_buff *skb, *data_skb; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2361 | int err, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2362 | |
| 2363 | if (flags&MSG_OOB) |
| 2364 | return -EOPNOTSUPP; |
| 2365 | |
| 2366 | copied = 0; |
| 2367 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2368 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
| 2369 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | goto out; |
| 2371 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2372 | data_skb = skb; |
| 2373 | |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2374 | #ifdef CONFIG_COMPAT_NETLINK_MESSAGES |
| 2375 | if (unlikely(skb_shinfo(skb)->frag_list)) { |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2376 | /* |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2377 | * If this skb has a frag_list, then here that means that we |
| 2378 | * will have to use the frag_list skb's data for compat tasks |
| 2379 | * and the regular skb's data for normal (non-compat) tasks. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2380 | * |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2381 | * If we need to send the compat skb, assign it to the |
| 2382 | * 'data_skb' variable so that it will be used below for data |
| 2383 | * copying. We keep 'skb' for everything else, including |
| 2384 | * freeing both later. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2385 | */ |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2386 | if (flags & MSG_CMSG_COMPAT) |
| 2387 | data_skb = skb_shinfo(skb)->frag_list; |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2388 | } |
| 2389 | #endif |
| 2390 | |
Eric Dumazet | 9063e21 | 2014-03-07 12:02:33 -0800 | [diff] [blame] | 2391 | /* Record the max length of recvmsg() calls for future allocations */ |
| 2392 | nlk->max_recvmsg_len = max(nlk->max_recvmsg_len, len); |
| 2393 | nlk->max_recvmsg_len = min_t(size_t, nlk->max_recvmsg_len, |
| 2394 | 16384); |
| 2395 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2396 | copied = data_skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2397 | if (len < copied) { |
| 2398 | msg->msg_flags |= MSG_TRUNC; |
| 2399 | copied = len; |
| 2400 | } |
| 2401 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2402 | skb_reset_transport_header(data_skb); |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 2403 | err = skb_copy_datagram_msg(data_skb, 0, msg, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | |
| 2405 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2406 | DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2407 | addr->nl_family = AF_NETLINK; |
| 2408 | addr->nl_pad = 0; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2409 | addr->nl_pid = NETLINK_CB(skb).portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2410 | addr->nl_groups = netlink_group_mask(NETLINK_CB(skb).dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2411 | msg->msg_namelen = sizeof(*addr); |
| 2412 | } |
| 2413 | |
Patrick McHardy | cc9a06c | 2006-03-12 20:34:27 -0800 | [diff] [blame] | 2414 | if (nlk->flags & NETLINK_RECV_PKTINFO) |
| 2415 | netlink_cmsg_recv_pktinfo(msg, skb); |
| 2416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2417 | if (NULL == siocb->scm) { |
| 2418 | memset(&scm, 0, sizeof(scm)); |
| 2419 | siocb->scm = &scm; |
| 2420 | } |
| 2421 | siocb->scm->creds = *NETLINK_CREDS(skb); |
Patrick McHardy | 188ccb5 | 2007-05-03 03:27:01 -0700 | [diff] [blame] | 2422 | if (flags & MSG_TRUNC) |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2423 | copied = data_skb->len; |
David S. Miller | daa3766 | 2010-08-15 23:21:50 -0700 | [diff] [blame] | 2424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2425 | skb_free_datagram(sk, skb); |
| 2426 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2427 | if (nlk->cb_running && |
| 2428 | atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) { |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2429 | ret = netlink_dump(sk); |
| 2430 | if (ret) { |
Ben Pfaff | ac30ef8 | 2014-07-09 10:31:22 -0700 | [diff] [blame] | 2431 | sk->sk_err = -ret; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2432 | sk->sk_error_report(sk); |
| 2433 | } |
| 2434 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2435 | |
| 2436 | scm_recv(sock, msg, siocb->scm, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | out: |
| 2438 | netlink_rcv_wake(sk); |
| 2439 | return err ? : copied; |
| 2440 | } |
| 2441 | |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 2442 | static void netlink_data_ready(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2444 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | } |
| 2446 | |
| 2447 | /* |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2448 | * We export these functions to other modules. They provide a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2449 | * complete set of kernel non-blocking support for message |
| 2450 | * queueing. |
| 2451 | */ |
| 2452 | |
| 2453 | struct sock * |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 2454 | __netlink_kernel_create(struct net *net, int unit, struct module *module, |
| 2455 | struct netlink_kernel_cfg *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | { |
| 2457 | struct socket *sock; |
| 2458 | struct sock *sk; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2459 | struct netlink_sock *nlk; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2460 | struct listeners *listeners = NULL; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2461 | struct mutex *cb_mutex = cfg ? cfg->cb_mutex : NULL; |
| 2462 | unsigned int groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2463 | |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2464 | BUG_ON(!nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2465 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2466 | if (unit < 0 || unit >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2467 | return NULL; |
| 2468 | |
| 2469 | if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock)) |
| 2470 | return NULL; |
| 2471 | |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 2472 | /* |
| 2473 | * We have to just have a reference on the net from sk, but don't |
| 2474 | * get_net it. Besides, we cannot get and then put the net here. |
| 2475 | * So we create one inside init_net and the move it to net. |
| 2476 | */ |
| 2477 | |
| 2478 | if (__netlink_create(&init_net, sock, cb_mutex, unit) < 0) |
| 2479 | goto out_sock_release_nosk; |
| 2480 | |
| 2481 | sk = sock->sk; |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 2482 | sk_change_net(sk, net); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2483 | |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2484 | if (!cfg || cfg->groups < 32) |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2485 | groups = 32; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2486 | else |
| 2487 | groups = cfg->groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2488 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2489 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2490 | if (!listeners) |
| 2491 | goto out_sock_release; |
| 2492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2493 | sk->sk_data_ready = netlink_data_ready; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2494 | if (cfg && cfg->input) |
| 2495 | nlk_sk(sk)->netlink_rcv = cfg->input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2497 | if (netlink_insert(sk, net, 0)) |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2498 | goto out_sock_release; |
| 2499 | |
| 2500 | nlk = nlk_sk(sk); |
| 2501 | nlk->flags |= NETLINK_KERNEL_SOCKET; |
| 2502 | |
| 2503 | netlink_table_grab(); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2504 | if (!nl_table[unit].registered) { |
| 2505 | nl_table[unit].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2506 | rcu_assign_pointer(nl_table[unit].listeners, listeners); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2507 | nl_table[unit].cb_mutex = cb_mutex; |
| 2508 | nl_table[unit].module = module; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2509 | if (cfg) { |
| 2510 | nl_table[unit].bind = cfg->bind; |
Hiroaki SHIMODA | 6251edd | 2014-11-13 04:24:10 +0900 | [diff] [blame] | 2511 | nl_table[unit].unbind = cfg->unbind; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2512 | nl_table[unit].flags = cfg->flags; |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 2513 | if (cfg->compare) |
| 2514 | nl_table[unit].compare = cfg->compare; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2515 | } |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2516 | nl_table[unit].registered = 1; |
Jesper Juhl | f937f1f46 | 2007-10-15 01:39:12 -0700 | [diff] [blame] | 2517 | } else { |
| 2518 | kfree(listeners); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 2519 | nl_table[unit].registered++; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2520 | } |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2521 | netlink_table_ungrab(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2522 | return sk; |
| 2523 | |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2524 | out_sock_release: |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2525 | kfree(listeners); |
Denis V. Lunev | 9dfbec1 | 2008-02-29 11:17:56 -0800 | [diff] [blame] | 2526 | netlink_kernel_release(sk); |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 2527 | return NULL; |
| 2528 | |
| 2529 | out_sock_release_nosk: |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2530 | sock_release(sock); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2531 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2532 | } |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 2533 | EXPORT_SYMBOL(__netlink_kernel_create); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 2534 | |
| 2535 | void |
| 2536 | netlink_kernel_release(struct sock *sk) |
| 2537 | { |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 2538 | sk_release_kernel(sk); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 2539 | } |
| 2540 | EXPORT_SYMBOL(netlink_kernel_release); |
| 2541 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2542 | int __netlink_change_ngroups(struct sock *sk, unsigned int groups) |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2543 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2544 | struct listeners *new, *old; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2545 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2546 | |
| 2547 | if (groups < 32) |
| 2548 | groups = 32; |
| 2549 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2550 | if (NLGRPSZ(tbl->groups) < NLGRPSZ(groups)) { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2551 | new = kzalloc(sizeof(*new) + NLGRPSZ(groups), GFP_ATOMIC); |
| 2552 | if (!new) |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2553 | return -ENOMEM; |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 2554 | old = nl_deref_protected(tbl->listeners); |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2555 | memcpy(new->masks, old->masks, NLGRPSZ(tbl->groups)); |
| 2556 | rcu_assign_pointer(tbl->listeners, new); |
| 2557 | |
Lai Jiangshan | 37b6b93 | 2011-03-15 18:01:42 +0800 | [diff] [blame] | 2558 | kfree_rcu(old, rcu); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2559 | } |
| 2560 | tbl->groups = groups; |
| 2561 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2562 | return 0; |
| 2563 | } |
| 2564 | |
| 2565 | /** |
| 2566 | * netlink_change_ngroups - change number of multicast groups |
| 2567 | * |
| 2568 | * This changes the number of multicast groups that are available |
| 2569 | * on a certain netlink family. Note that it is not possible to |
| 2570 | * change the number of groups to below 32. Also note that it does |
| 2571 | * not implicitly call netlink_clear_multicast_users() when the |
| 2572 | * number of groups is reduced. |
| 2573 | * |
| 2574 | * @sk: The kernel netlink socket, as returned by netlink_kernel_create(). |
| 2575 | * @groups: The new number of groups. |
| 2576 | */ |
| 2577 | int netlink_change_ngroups(struct sock *sk, unsigned int groups) |
| 2578 | { |
| 2579 | int err; |
| 2580 | |
| 2581 | netlink_table_grab(); |
| 2582 | err = __netlink_change_ngroups(sk, groups); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2583 | netlink_table_ungrab(); |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2584 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2585 | return err; |
| 2586 | } |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2587 | |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 2588 | void __netlink_clear_multicast_users(struct sock *ksk, unsigned int group) |
| 2589 | { |
| 2590 | struct sock *sk; |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 2591 | struct netlink_table *tbl = &nl_table[ksk->sk_protocol]; |
| 2592 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2593 | sk_for_each_bound(sk, &tbl->mc_list) |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 2594 | netlink_update_socket_mc(nlk_sk(sk), group, 0); |
| 2595 | } |
| 2596 | |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2597 | struct nlmsghdr * |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2598 | __nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags) |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2599 | { |
| 2600 | struct nlmsghdr *nlh; |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 2601 | int size = nlmsg_msg_size(len); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2602 | |
Wang Yufen | 23b4567 | 2014-02-17 16:53:32 +0800 | [diff] [blame] | 2603 | nlh = (struct nlmsghdr *)skb_put(skb, NLMSG_ALIGN(size)); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2604 | nlh->nlmsg_type = type; |
| 2605 | nlh->nlmsg_len = size; |
| 2606 | nlh->nlmsg_flags = flags; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2607 | nlh->nlmsg_pid = portid; |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2608 | nlh->nlmsg_seq = seq; |
| 2609 | if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0) |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 2610 | memset(nlmsg_data(nlh) + len, 0, NLMSG_ALIGN(size) - size); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2611 | return nlh; |
| 2612 | } |
| 2613 | EXPORT_SYMBOL(__nlmsg_put); |
| 2614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | /* |
| 2616 | * It looks a bit ugly. |
| 2617 | * It would be better to create kernel thread. |
| 2618 | */ |
| 2619 | |
| 2620 | static int netlink_dump(struct sock *sk) |
| 2621 | { |
| 2622 | struct netlink_sock *nlk = nlk_sk(sk); |
| 2623 | struct netlink_callback *cb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2624 | struct sk_buff *skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2625 | struct nlmsghdr *nlh; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2626 | int len, err = -ENOBUFS; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2627 | int alloc_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2628 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2629 | mutex_lock(nlk->cb_mutex); |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2630 | if (!nlk->cb_running) { |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2631 | err = -EINVAL; |
| 2632 | goto errout_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2633 | } |
| 2634 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2635 | cb = &nlk->cb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2636 | alloc_size = max_t(int, cb->min_dump_alloc, NLMSG_GOODSIZE); |
| 2637 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2638 | if (!netlink_rx_is_mmaped(sk) && |
| 2639 | atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
| 2640 | goto errout_skb; |
Eric Dumazet | 9063e21 | 2014-03-07 12:02:33 -0800 | [diff] [blame] | 2641 | |
| 2642 | /* NLMSG_GOODSIZE is small to avoid high order allocations being |
| 2643 | * required, but it makes sense to _attempt_ a 16K bytes allocation |
| 2644 | * to reduce number of system calls on dump operations, if user |
| 2645 | * ever provided a big enough buffer. |
| 2646 | */ |
| 2647 | if (alloc_size < nlk->max_recvmsg_len) { |
| 2648 | skb = netlink_alloc_skb(sk, |
| 2649 | nlk->max_recvmsg_len, |
| 2650 | nlk->portid, |
| 2651 | GFP_KERNEL | |
| 2652 | __GFP_NOWARN | |
| 2653 | __GFP_NORETRY); |
| 2654 | /* available room should be exact amount to avoid MSG_TRUNC */ |
| 2655 | if (skb) |
| 2656 | skb_reserve(skb, skb_tailroom(skb) - |
| 2657 | nlk->max_recvmsg_len); |
| 2658 | } |
| 2659 | if (!skb) |
| 2660 | skb = netlink_alloc_skb(sk, alloc_size, nlk->portid, |
| 2661 | GFP_KERNEL); |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2662 | if (!skb) |
Dan Carpenter | c63d6ea | 2011-06-15 03:11:42 +0000 | [diff] [blame] | 2663 | goto errout_skb; |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2664 | netlink_skb_set_owner_r(skb, sk); |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2666 | len = cb->dump(skb, cb); |
| 2667 | |
| 2668 | if (len > 0) { |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2669 | mutex_unlock(nlk->cb_mutex); |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 2670 | |
| 2671 | if (sk_filter(sk, skb)) |
| 2672 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 2673 | else |
| 2674 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | return 0; |
| 2676 | } |
| 2677 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2678 | nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI); |
| 2679 | if (!nlh) |
| 2680 | goto errout_skb; |
| 2681 | |
Johannes Berg | 670dc28 | 2011-06-20 13:40:46 +0200 | [diff] [blame] | 2682 | nl_dump_check_consistent(cb, nlh); |
| 2683 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2684 | memcpy(nlmsg_data(nlh), &len, sizeof(len)); |
| 2685 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 2686 | if (sk_filter(sk, skb)) |
| 2687 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 2688 | else |
| 2689 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2690 | |
Thomas Graf | a8f74b2 | 2005-11-10 02:25:52 +0100 | [diff] [blame] | 2691 | if (cb->done) |
| 2692 | cb->done(cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2693 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2694 | nlk->cb_running = false; |
| 2695 | mutex_unlock(nlk->cb_mutex); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2696 | module_put(cb->module); |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2697 | consume_skb(cb->skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2698 | return 0; |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 2699 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2700 | errout_skb: |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2701 | mutex_unlock(nlk->cb_mutex); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2702 | kfree_skb(skb); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2703 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2704 | } |
| 2705 | |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2706 | int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
| 2707 | const struct nlmsghdr *nlh, |
| 2708 | struct netlink_dump_control *control) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2709 | { |
| 2710 | struct netlink_callback *cb; |
| 2711 | struct sock *sk; |
| 2712 | struct netlink_sock *nlk; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2713 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2714 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2715 | /* Memory mapped dump requests need to be copied to avoid looping |
| 2716 | * on the pending state in netlink_mmap_sendmsg() while the CB hold |
| 2717 | * a reference to the skb. |
| 2718 | */ |
| 2719 | if (netlink_skb_is_mmaped(skb)) { |
| 2720 | skb = skb_copy(skb, GFP_KERNEL); |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2721 | if (skb == NULL) |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2722 | return -ENOBUFS; |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2723 | } else |
| 2724 | atomic_inc(&skb->users); |
| 2725 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2726 | sk = netlink_lookup(sock_net(ssk), ssk->sk_protocol, NETLINK_CB(skb).portid); |
| 2727 | if (sk == NULL) { |
| 2728 | ret = -ECONNREFUSED; |
| 2729 | goto error_free; |
| 2730 | } |
| 2731 | |
| 2732 | nlk = nlk_sk(sk); |
| 2733 | mutex_lock(nlk->cb_mutex); |
| 2734 | /* A dump is in progress... */ |
| 2735 | if (nlk->cb_running) { |
| 2736 | ret = -EBUSY; |
| 2737 | goto error_unlock; |
| 2738 | } |
| 2739 | /* add reference of module which cb->dump belongs to */ |
| 2740 | if (!try_module_get(control->module)) { |
| 2741 | ret = -EPROTONOSUPPORT; |
| 2742 | goto error_unlock; |
| 2743 | } |
| 2744 | |
| 2745 | cb = &nlk->cb; |
| 2746 | memset(cb, 0, sizeof(*cb)); |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 2747 | cb->dump = control->dump; |
| 2748 | cb->done = control->done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2749 | cb->nlh = nlh; |
Pablo Neira Ayuso | 7175c88 | 2012-02-24 14:30:16 +0000 | [diff] [blame] | 2750 | cb->data = control->data; |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2751 | cb->module = control->module; |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 2752 | cb->min_dump_alloc = control->min_dump_alloc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2753 | cb->skb = skb; |
| 2754 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2755 | nlk->cb_running = true; |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2756 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2757 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2758 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2759 | ret = netlink_dump(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2760 | sock_put(sk); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2761 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2762 | if (ret) |
| 2763 | return ret; |
| 2764 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2765 | /* We successfully started a dump, by returning -EINTR we |
| 2766 | * signal not to send ACK even if it was requested. |
| 2767 | */ |
| 2768 | return -EINTR; |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2769 | |
| 2770 | error_unlock: |
| 2771 | sock_put(sk); |
| 2772 | mutex_unlock(nlk->cb_mutex); |
| 2773 | error_free: |
| 2774 | kfree_skb(skb); |
| 2775 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2776 | } |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2777 | EXPORT_SYMBOL(__netlink_dump_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2778 | |
| 2779 | void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err) |
| 2780 | { |
| 2781 | struct sk_buff *skb; |
| 2782 | struct nlmsghdr *rep; |
| 2783 | struct nlmsgerr *errmsg; |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2784 | size_t payload = sizeof(*errmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2785 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2786 | /* error messages get the original request appened */ |
| 2787 | if (err) |
| 2788 | payload += nlmsg_len(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2790 | skb = netlink_alloc_skb(in_skb->sk, nlmsg_total_size(payload), |
| 2791 | NETLINK_CB(in_skb).portid, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2792 | if (!skb) { |
| 2793 | struct sock *sk; |
| 2794 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2795 | sk = netlink_lookup(sock_net(in_skb->sk), |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2796 | in_skb->sk->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2797 | NETLINK_CB(in_skb).portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2798 | if (sk) { |
| 2799 | sk->sk_err = ENOBUFS; |
| 2800 | sk->sk_error_report(sk); |
| 2801 | sock_put(sk); |
| 2802 | } |
| 2803 | return; |
| 2804 | } |
| 2805 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2806 | rep = __nlmsg_put(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
John Fastabend | 5dba93a | 2009-09-25 13:11:44 +0000 | [diff] [blame] | 2807 | NLMSG_ERROR, payload, 0); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2808 | errmsg = nlmsg_data(rep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2809 | errmsg->error = err; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2810 | memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(*nlh)); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2811 | netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).portid, MSG_DONTWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2812 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2813 | EXPORT_SYMBOL(netlink_ack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2814 | |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2815 | int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *, |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 2816 | struct nlmsghdr *)) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2817 | { |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2818 | struct nlmsghdr *nlh; |
| 2819 | int err; |
| 2820 | |
| 2821 | while (skb->len >= nlmsg_total_size(0)) { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2822 | int msglen; |
| 2823 | |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 2824 | nlh = nlmsg_hdr(skb); |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2825 | err = 0; |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2826 | |
Martin Murray | ad8e4b7 | 2006-01-10 13:02:29 -0800 | [diff] [blame] | 2827 | if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2828 | return 0; |
| 2829 | |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2830 | /* Only requests are handled by the kernel */ |
| 2831 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2832 | goto ack; |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2833 | |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 2834 | /* Skip control messages */ |
| 2835 | if (nlh->nlmsg_type < NLMSG_MIN_TYPE) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2836 | goto ack; |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 2837 | |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 2838 | err = cb(skb, nlh); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2839 | if (err == -EINTR) |
| 2840 | goto skip; |
| 2841 | |
| 2842 | ack: |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2843 | if (nlh->nlmsg_flags & NLM_F_ACK || err) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2844 | netlink_ack(skb, nlh, err); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2845 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2846 | skip: |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2847 | msglen = NLMSG_ALIGN(nlh->nlmsg_len); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2848 | if (msglen > skb->len) |
| 2849 | msglen = skb->len; |
| 2850 | skb_pull(skb, msglen); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2851 | } |
| 2852 | |
| 2853 | return 0; |
| 2854 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2855 | EXPORT_SYMBOL(netlink_rcv_skb); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2856 | |
| 2857 | /** |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2858 | * nlmsg_notify - send a notification netlink message |
| 2859 | * @sk: netlink socket to use |
| 2860 | * @skb: notification message |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2861 | * @portid: destination netlink portid for reports or 0 |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2862 | * @group: destination multicast group or 0 |
| 2863 | * @report: 1 to report back, 0 to disable |
| 2864 | * @flags: allocation flags |
| 2865 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2866 | int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2867 | unsigned int group, int report, gfp_t flags) |
| 2868 | { |
| 2869 | int err = 0; |
| 2870 | |
| 2871 | if (group) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2872 | int exclude_portid = 0; |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2873 | |
| 2874 | if (report) { |
| 2875 | atomic_inc(&skb->users); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2876 | exclude_portid = portid; |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2877 | } |
| 2878 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2879 | /* errors reported via destination sk->sk_err, but propagate |
| 2880 | * delivery errors if NETLINK_BROADCAST_ERROR flag is set */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2881 | err = nlmsg_multicast(sk, skb, exclude_portid, group, flags); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2882 | } |
| 2883 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2884 | if (report) { |
| 2885 | int err2; |
| 2886 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2887 | err2 = nlmsg_unicast(sk, skb, portid); |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2888 | if (!err || err == -ESRCH) |
| 2889 | err = err2; |
| 2890 | } |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2891 | |
| 2892 | return err; |
| 2893 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2894 | EXPORT_SYMBOL(nlmsg_notify); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2895 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2896 | #ifdef CONFIG_PROC_FS |
| 2897 | struct nl_seq_iter { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2898 | struct seq_net_private p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2899 | int link; |
| 2900 | int hash_idx; |
| 2901 | }; |
| 2902 | |
| 2903 | static struct sock *netlink_seq_socket_idx(struct seq_file *seq, loff_t pos) |
| 2904 | { |
| 2905 | struct nl_seq_iter *iter = seq->private; |
| 2906 | int i, j; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2907 | struct netlink_sock *nlk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2908 | struct sock *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2909 | loff_t off = 0; |
| 2910 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2911 | for (i = 0; i < MAX_LINKS; i++) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2912 | struct rhashtable *ht = &nl_table[i].hash; |
Eric Dumazet | 67a24ac | 2014-08-05 07:50:07 +0200 | [diff] [blame] | 2913 | const struct bucket_table *tbl = rht_dereference_rcu(ht->tbl, ht); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2914 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2915 | for (j = 0; j < tbl->size; j++) { |
| 2916 | rht_for_each_entry_rcu(nlk, tbl->buckets[j], node) { |
| 2917 | s = (struct sock *)nlk; |
| 2918 | |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2919 | if (sock_net(s) != seq_file_net(seq)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2920 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2921 | if (off == pos) { |
| 2922 | iter->link = i; |
| 2923 | iter->hash_idx = j; |
| 2924 | return s; |
| 2925 | } |
| 2926 | ++off; |
| 2927 | } |
| 2928 | } |
| 2929 | } |
| 2930 | return NULL; |
| 2931 | } |
| 2932 | |
| 2933 | static void *netlink_seq_start(struct seq_file *seq, loff_t *pos) |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2934 | __acquires(nl_table_lock) __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2935 | { |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2936 | read_lock(&nl_table_lock); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2937 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2938 | return *pos ? netlink_seq_socket_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2939 | } |
| 2940 | |
| 2941 | static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2942 | { |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2943 | struct rhashtable *ht; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2944 | struct netlink_sock *nlk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2945 | struct nl_seq_iter *iter; |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 2946 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2947 | int i, j; |
| 2948 | |
| 2949 | ++*pos; |
| 2950 | |
| 2951 | if (v == SEQ_START_TOKEN) |
| 2952 | return netlink_seq_socket_idx(seq, 0); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2953 | |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 2954 | net = seq_file_net(seq); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2955 | iter = seq->private; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2956 | nlk = v; |
| 2957 | |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2958 | i = iter->link; |
| 2959 | ht = &nl_table[i].hash; |
| 2960 | rht_for_each_entry(nlk, nlk->node.next, ht, node) |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2961 | if (net_eq(sock_net((struct sock *)nlk), net)) |
| 2962 | return nlk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2963 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2964 | j = iter->hash_idx + 1; |
| 2965 | |
| 2966 | do { |
Eric Dumazet | 67a24ac | 2014-08-05 07:50:07 +0200 | [diff] [blame] | 2967 | const struct bucket_table *tbl = rht_dereference_rcu(ht->tbl, ht); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2968 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2969 | for (; j < tbl->size; j++) { |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2970 | rht_for_each_entry(nlk, tbl->buckets[j], ht, node) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2971 | if (net_eq(sock_net((struct sock *)nlk), net)) { |
| 2972 | iter->link = i; |
| 2973 | iter->hash_idx = j; |
| 2974 | return nlk; |
| 2975 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2976 | } |
| 2977 | } |
| 2978 | |
| 2979 | j = 0; |
| 2980 | } while (++i < MAX_LINKS); |
| 2981 | |
| 2982 | return NULL; |
| 2983 | } |
| 2984 | |
| 2985 | static void netlink_seq_stop(struct seq_file *seq, void *v) |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2986 | __releases(RCU) __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2987 | { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2988 | rcu_read_unlock(); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2989 | read_unlock(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2990 | } |
| 2991 | |
| 2992 | |
| 2993 | static int netlink_seq_show(struct seq_file *seq, void *v) |
| 2994 | { |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2995 | if (v == SEQ_START_TOKEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2996 | seq_puts(seq, |
| 2997 | "sk Eth Pid Groups " |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 2998 | "Rmem Wmem Dump Locks Drops Inode\n"); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2999 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3000 | struct sock *s = v; |
| 3001 | struct netlink_sock *nlk = nlk_sk(s); |
| 3002 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 3003 | seq_printf(seq, "%pK %-3d %-6u %08x %-8d %-8d %d %-8d %-8d %-8lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3004 | s, |
| 3005 | s->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 3006 | nlk->portid, |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 3007 | nlk->groups ? (u32)nlk->groups[0] : 0, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 3008 | sk_rmem_alloc_get(s), |
| 3009 | sk_wmem_alloc_get(s), |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 3010 | nlk->cb_running, |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 3011 | atomic_read(&s->sk_refcnt), |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 3012 | atomic_read(&s->sk_drops), |
| 3013 | sock_i_ino(s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3014 | ); |
| 3015 | |
| 3016 | } |
| 3017 | return 0; |
| 3018 | } |
| 3019 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 3020 | static const struct seq_operations netlink_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3021 | .start = netlink_seq_start, |
| 3022 | .next = netlink_seq_next, |
| 3023 | .stop = netlink_seq_stop, |
| 3024 | .show = netlink_seq_show, |
| 3025 | }; |
| 3026 | |
| 3027 | |
| 3028 | static int netlink_seq_open(struct inode *inode, struct file *file) |
| 3029 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3030 | return seq_open_net(inode, file, &netlink_seq_ops, |
| 3031 | sizeof(struct nl_seq_iter)); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3032 | } |
| 3033 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 3034 | static const struct file_operations netlink_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3035 | .owner = THIS_MODULE, |
| 3036 | .open = netlink_seq_open, |
| 3037 | .read = seq_read, |
| 3038 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3039 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3040 | }; |
| 3041 | |
| 3042 | #endif |
| 3043 | |
| 3044 | int netlink_register_notifier(struct notifier_block *nb) |
| 3045 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 3046 | return atomic_notifier_chain_register(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3047 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 3048 | EXPORT_SYMBOL(netlink_register_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3049 | |
| 3050 | int netlink_unregister_notifier(struct notifier_block *nb) |
| 3051 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 3052 | return atomic_notifier_chain_unregister(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3053 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 3054 | EXPORT_SYMBOL(netlink_unregister_notifier); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 3055 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 3056 | static const struct proto_ops netlink_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3057 | .family = PF_NETLINK, |
| 3058 | .owner = THIS_MODULE, |
| 3059 | .release = netlink_release, |
| 3060 | .bind = netlink_bind, |
| 3061 | .connect = netlink_connect, |
| 3062 | .socketpair = sock_no_socketpair, |
| 3063 | .accept = sock_no_accept, |
| 3064 | .getname = netlink_getname, |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 3065 | .poll = netlink_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3066 | .ioctl = sock_no_ioctl, |
| 3067 | .listen = sock_no_listen, |
| 3068 | .shutdown = sock_no_shutdown, |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 3069 | .setsockopt = netlink_setsockopt, |
| 3070 | .getsockopt = netlink_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3071 | .sendmsg = netlink_sendmsg, |
| 3072 | .recvmsg = netlink_recvmsg, |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 3073 | .mmap = netlink_mmap, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3074 | .sendpage = sock_no_sendpage, |
| 3075 | }; |
| 3076 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 3077 | static const struct net_proto_family netlink_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3078 | .family = PF_NETLINK, |
| 3079 | .create = netlink_create, |
| 3080 | .owner = THIS_MODULE, /* for consistency 8) */ |
| 3081 | }; |
| 3082 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3083 | static int __net_init netlink_net_init(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3084 | { |
| 3085 | #ifdef CONFIG_PROC_FS |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 3086 | if (!proc_create("netlink", 0, net->proc_net, &netlink_seq_fops)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3087 | return -ENOMEM; |
| 3088 | #endif |
| 3089 | return 0; |
| 3090 | } |
| 3091 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3092 | static void __net_exit netlink_net_exit(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3093 | { |
| 3094 | #ifdef CONFIG_PROC_FS |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 3095 | remove_proc_entry("netlink", net->proc_net); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3096 | #endif |
| 3097 | } |
| 3098 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3099 | static void __init netlink_add_usersock_entry(void) |
| 3100 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3101 | struct listeners *listeners; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3102 | int groups = 32; |
| 3103 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3104 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3105 | if (!listeners) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3106 | panic("netlink_add_usersock_entry: Cannot allocate listeners\n"); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3107 | |
| 3108 | netlink_table_grab(); |
| 3109 | |
| 3110 | nl_table[NETLINK_USERSOCK].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3111 | rcu_assign_pointer(nl_table[NETLINK_USERSOCK].listeners, listeners); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3112 | nl_table[NETLINK_USERSOCK].module = THIS_MODULE; |
| 3113 | nl_table[NETLINK_USERSOCK].registered = 1; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 3114 | nl_table[NETLINK_USERSOCK].flags = NL_CFG_F_NONROOT_SEND; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3115 | |
| 3116 | netlink_table_ungrab(); |
| 3117 | } |
| 3118 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 3119 | static struct pernet_operations __net_initdata netlink_net_ops = { |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3120 | .init = netlink_net_init, |
| 3121 | .exit = netlink_net_exit, |
| 3122 | }; |
| 3123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3124 | static int __init netlink_proto_init(void) |
| 3125 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3126 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | int err = proto_register(&netlink_proto, 0); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 3128 | struct rhashtable_params ht_params = { |
| 3129 | .head_offset = offsetof(struct netlink_sock, node), |
| 3130 | .key_offset = offsetof(struct netlink_sock, portid), |
| 3131 | .key_len = sizeof(u32), /* portid */ |
| 3132 | .hashfn = arch_fast_hash, |
| 3133 | .max_shift = 16, /* 64K */ |
| 3134 | .grow_decision = rht_grow_above_75, |
| 3135 | .shrink_decision = rht_shrink_below_30, |
Herbert Xu | 9712756 | 2014-11-13 18:11:18 +0800 | [diff] [blame] | 3136 | #ifdef CONFIG_PROVE_LOCKING |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 3137 | .mutex_is_held = lockdep_nl_sk_hash_is_held, |
Herbert Xu | 9712756 | 2014-11-13 18:11:18 +0800 | [diff] [blame] | 3138 | #endif |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 3139 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3140 | |
| 3141 | if (err != 0) |
| 3142 | goto out; |
| 3143 | |
YOSHIFUJI Hideaki / 吉藤英明 | fab2574 | 2013-01-09 07:19:48 +0000 | [diff] [blame] | 3144 | BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3145 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 3146 | nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 3147 | if (!nl_table) |
| 3148 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3150 | for (i = 0; i < MAX_LINKS; i++) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 3151 | if (rhashtable_init(&nl_table[i].hash, &ht_params) < 0) { |
| 3152 | while (--i > 0) |
| 3153 | rhashtable_destroy(&nl_table[i].hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3154 | kfree(nl_table); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 3155 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3156 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3157 | } |
| 3158 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 3159 | INIT_LIST_HEAD(&netlink_tap_all); |
| 3160 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3161 | netlink_add_usersock_entry(); |
| 3162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3163 | sock_register(&netlink_family_ops); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3164 | register_pernet_subsys(&netlink_net_ops); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 3165 | /* The netlink device handler may be needed early. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3166 | rtnetlink_init(); |
| 3167 | out: |
| 3168 | return err; |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 3169 | panic: |
| 3170 | panic("netlink_init: Cannot allocate nl_table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3171 | } |
| 3172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3173 | core_initcall(netlink_proto_init); |