blob: 1b745d412cf6eb8c0b2d424ab5e5c8cbbc439248 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * PF_INET protocol family socket handler.
7 *
Jesper Juhl02c30a82005-05-05 16:16:16 -07008 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Florian La Roche, <flla@stud.uni-sb.de>
11 * Alan Cox, <A.Cox@swansea.ac.uk>
12 *
13 * Changes (see also sock.c)
14 *
15 * piggy,
16 * Karl Knutson : Socket protocol table
17 * A.N.Kuznetsov : Socket death error in accept().
18 * John Richardson : Fix non blocking error in connect()
19 * so sockets that fail to connect
20 * don't return -EINPROGRESS.
21 * Alan Cox : Asynchronous I/O support
22 * Alan Cox : Keep correct socket pointer on sock
23 * structures
24 * when accept() ed
25 * Alan Cox : Semantics of SO_LINGER aren't state
26 * moved to close when you look carefully.
27 * With this fixed and the accept bug fixed
28 * some RPC stuff seems happier.
29 * Niibe Yutaka : 4.4BSD style write async I/O
30 * Alan Cox,
31 * Tony Gale : Fixed reuse semantics.
32 * Alan Cox : bind() shouldn't abort existing but dead
33 * sockets. Stops FTP netin:.. I hope.
34 * Alan Cox : bind() works correctly for RAW sockets.
35 * Note that FreeBSD at least was broken
36 * in this respect so be careful with
37 * compatibility tests...
38 * Alan Cox : routing cache support
39 * Alan Cox : memzero the socket structure for
40 * compactness.
41 * Matt Day : nonblock connect error handler
42 * Alan Cox : Allow large numbers of pending sockets
43 * (eg for big web sites), but only if
44 * specifically application requested.
45 * Alan Cox : New buffering throughout IP. Used
46 * dumbly.
47 * Alan Cox : New buffering now used smartly.
48 * Alan Cox : BSD rather than common sense
49 * interpretation of listen.
50 * Germano Caronni : Assorted small races.
51 * Alan Cox : sendmsg/recvmsg basic support.
52 * Alan Cox : Only sendmsg/recvmsg now supported.
53 * Alan Cox : Locked down bind (see security list).
54 * Alan Cox : Loosened bind a little.
55 * Mike McLagan : ADD/DEL DLCI Ioctls
56 * Willy Konynenberg : Transparent proxying support.
57 * David S. Miller : New socket lookup architecture.
58 * Some other random speedups.
59 * Cyrus Durgin : Cleaned up file for kmod hacks.
60 * Andi Kleen : Fix inet_stream_connect TCP race.
61 *
62 * This program is free software; you can redistribute it and/or
63 * modify it under the terms of the GNU General Public License
64 * as published by the Free Software Foundation; either version
65 * 2 of the License, or (at your option) any later version.
66 */
67
Herbert Xuf4c50d92006-06-22 03:02:40 -070068#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#include <linux/errno.h>
70#include <linux/types.h>
71#include <linux/socket.h>
72#include <linux/in.h>
73#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070074#include <linux/module.h>
75#include <linux/sched.h>
76#include <linux/timer.h>
77#include <linux/string.h>
78#include <linux/sockios.h>
79#include <linux/net.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080080#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <linux/fcntl.h>
82#include <linux/mm.h>
83#include <linux/interrupt.h>
84#include <linux/stat.h>
85#include <linux/init.h>
86#include <linux/poll.h>
87#include <linux/netfilter_ipv4.h>
David S. Millerb3da2cf2007-03-23 11:40:27 -070088#include <linux/random.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090089#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91#include <asm/uaccess.h>
92#include <asm/system.h>
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094#include <linux/inet.h>
95#include <linux/igmp.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020096#include <linux/inetdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070097#include <linux/netdevice.h>
Herbert Xu73cc19f2008-12-15 23:41:09 -080098#include <net/checksum.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#include <net/ip.h>
100#include <net/protocol.h>
101#include <net/arp.h>
102#include <net/route.h>
103#include <net/ip_fib.h>
Arnaldo Carvalho de Melo295f7322005-08-09 20:11:56 -0700104#include <net/inet_connection_sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105#include <net/tcp.h>
106#include <net/udp.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800107#include <net/udplite.h>
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000108#include <net/ping.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#include <linux/skbuff.h>
110#include <net/sock.h>
111#include <net/raw.h>
112#include <net/icmp.h>
113#include <net/ipip.h>
114#include <net/inet_common.h>
115#include <net/xfrm.h>
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -0700116#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#ifdef CONFIG_IP_MROUTE
118#include <linux/mroute.h>
119#endif
120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122/* The inetsw table contains everything that inet_create needs to
123 * build a new socket.
124 */
125static struct list_head inetsw[SOCK_MAX];
126static DEFINE_SPINLOCK(inetsw_lock);
127
Pavel Emelyanov9ba63972007-12-05 01:38:23 -0800128struct ipv4_config ipv4_config;
Pavel Emelyanov9ba63972007-12-05 01:38:23 -0800129EXPORT_SYMBOL(ipv4_config);
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131/* New destruction routine */
132
133void inet_sock_destruct(struct sock *sk)
134{
135 struct inet_sock *inet = inet_sk(sk);
136
137 __skb_queue_purge(&sk->sk_receive_queue);
138 __skb_queue_purge(&sk->sk_error_queue);
139
Hideo Aoki95766ff2007-12-31 00:29:24 -0800140 sk_mem_reclaim(sk);
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700143 pr_err("Attempt to release TCP socket in state %d %p\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 sk->sk_state, sk);
145 return;
146 }
147 if (!sock_flag(sk, SOCK_DEAD)) {
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700148 pr_err("Attempt to release alive inet socket %p\n", sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 return;
150 }
151
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700152 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
153 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
154 WARN_ON(sk->sk_wmem_queued);
155 WARN_ON(sk->sk_forward_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000157 kfree(rcu_dereference_protected(inet->inet_opt, 1));
Eric Dumazetb6c67122010-04-08 23:03:29 +0000158 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700159 sk_refcnt_debug_dec(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700161EXPORT_SYMBOL(inet_sock_destruct);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163/*
164 * The routines beyond this point handle the behaviour of an AF_INET
165 * socket object. Mostly it punts to the subprotocols of IP to do
166 * the work.
167 */
168
169/*
170 * Automatically bind an unbound socket.
171 */
172
173static int inet_autobind(struct sock *sk)
174{
175 struct inet_sock *inet;
176 /* We may need to bind the socket. */
177 lock_sock(sk);
178 inet = inet_sk(sk);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000179 if (!inet->inet_num) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 if (sk->sk_prot->get_port(sk, 0)) {
181 release_sock(sk);
182 return -EAGAIN;
183 }
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000184 inet->inet_sport = htons(inet->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186 release_sock(sk);
187 return 0;
188}
189
190/*
191 * Move a socket into listening state.
192 */
193int inet_listen(struct socket *sock, int backlog)
194{
195 struct sock *sk = sock->sk;
196 unsigned char old_state;
197 int err;
198
199 lock_sock(sk);
200
201 err = -EINVAL;
202 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
203 goto out;
204
205 old_state = sk->sk_state;
206 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
207 goto out;
208
209 /* Really, if the socket is already in listen state
210 * we can only allow the backlog to be adjusted.
211 */
212 if (old_state != TCP_LISTEN) {
Eric Dumazet72a3eff2006-11-16 02:30:37 -0800213 err = inet_csk_listen_start(sk, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (err)
215 goto out;
216 }
217 sk->sk_max_ack_backlog = backlog;
218 err = 0;
219
220out:
221 release_sock(sk);
222 return err;
223}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700224EXPORT_SYMBOL(inet_listen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Eric Dumazetbe776282007-03-27 13:53:04 -0700226u32 inet_ehash_secret __read_mostly;
David S. Millerb3da2cf2007-03-23 11:40:27 -0700227EXPORT_SYMBOL(inet_ehash_secret);
228
Eric Dumazetbe776282007-03-27 13:53:04 -0700229/*
230 * inet_ehash_secret must be set exactly once
Eric Dumazetbe776282007-03-27 13:53:04 -0700231 */
David S. Millerb3da2cf2007-03-23 11:40:27 -0700232void build_ehash_secret(void)
233{
Eric Dumazetbe776282007-03-27 13:53:04 -0700234 u32 rnd;
Eric Dumazet49e8ab02010-08-19 06:10:45 +0000235
Eric Dumazetbe776282007-03-27 13:53:04 -0700236 do {
237 get_random_bytes(&rnd, sizeof(rnd));
238 } while (rnd == 0);
Eric Dumazet49e8ab02010-08-19 06:10:45 +0000239
240 cmpxchg(&inet_ehash_secret, 0, rnd);
David S. Millerb3da2cf2007-03-23 11:40:27 -0700241}
242EXPORT_SYMBOL(build_ehash_secret);
243
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700244static inline int inet_netns_ok(struct net *net, int protocol)
245{
246 int hash;
Alexey Dobriyan32613092009-09-14 12:21:47 +0000247 const struct net_protocol *ipprot;
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700248
Eric Dumazet04f258c2008-11-23 15:42:23 -0800249 if (net_eq(net, &init_net))
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700250 return 1;
251
252 hash = protocol & (MAX_INET_PROTOS - 1);
253 ipprot = rcu_dereference(inet_protos[hash]);
254
255 if (ipprot == NULL)
256 /* raw IP is OK */
257 return 1;
258 return ipprot->netns_ok;
259}
260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261/*
262 * Create an inet socket.
263 */
264
Eric Paris3f378b62009-11-05 22:18:14 -0800265static int inet_create(struct net *net, struct socket *sock, int protocol,
266 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
268 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 struct inet_protosw *answer;
270 struct inet_sock *inet;
271 struct proto *answer_prot;
272 unsigned char answer_flags;
273 char answer_no_check;
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700274 int try_loading_module = 0;
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800275 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Eric Dumazet04f258c2008-11-23 15:42:23 -0800277 if (unlikely(!inet_ehash_secret))
278 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
279 build_ehash_secret();
David S. Millerb3da2cf2007-03-23 11:40:27 -0700280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 sock->state = SS_UNCONNECTED;
282
283 /* Look for the requested type/protocol pair. */
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700284lookup_protocol:
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800285 err = -ESOCKTNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 rcu_read_lock();
Paul E. McKenney696adfe2008-07-25 01:45:34 -0700287 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Paul E. McKenney696adfe2008-07-25 01:45:34 -0700289 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 /* Check the non-wild match. */
291 if (protocol == answer->protocol) {
292 if (protocol != IPPROTO_IP)
293 break;
294 } else {
295 /* Check for the two wild cases. */
296 if (IPPROTO_IP == protocol) {
297 protocol = answer->protocol;
298 break;
299 }
300 if (IPPROTO_IP == answer->protocol)
301 break;
302 }
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800303 err = -EPROTONOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 }
305
Paul E. McKenney696adfe2008-07-25 01:45:34 -0700306 if (unlikely(err)) {
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700307 if (try_loading_module < 2) {
308 rcu_read_unlock();
309 /*
310 * Be more specific, e.g. net-pf-2-proto-132-type-1
311 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
312 */
313 if (++try_loading_module == 1)
314 request_module("net-pf-%d-proto-%d-type-%d",
315 PF_INET, protocol, sock->type);
316 /*
317 * Fall back to generic, e.g. net-pf-2-proto-132
318 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
319 */
320 else
321 request_module("net-pf-%d-proto-%d",
322 PF_INET, protocol);
323 goto lookup_protocol;
324 } else
325 goto out_rcu_unlock;
326 }
327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 err = -EPERM;
Eric Parisc84b3262009-11-05 20:45:52 -0800329 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700332 err = -EAFNOSUPPORT;
333 if (!inet_netns_ok(net, protocol))
334 goto out_rcu_unlock;
335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 sock->ops = answer->ops;
337 answer_prot = answer->prot;
338 answer_no_check = answer->no_check;
339 answer_flags = answer->flags;
340 rcu_read_unlock();
341
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700342 WARN_ON(answer_prot->slab == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
344 err = -ENOBUFS;
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700345 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 if (sk == NULL)
347 goto out;
348
349 err = 0;
350 sk->sk_no_check = answer_no_check;
351 if (INET_PROTOSW_REUSE & answer_flags)
352 sk->sk_reuse = 1;
353
354 inet = inet_sk(sk);
Paul Moore469de9b2007-01-09 14:37:06 -0800355 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
Jiri Olsa7b2ff182010-06-15 01:07:31 +0000357 inet->nodefrag = 0;
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 if (SOCK_RAW == sock->type) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000360 inet->inet_num = protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 if (IPPROTO_RAW == protocol)
362 inet->hdrincl = 1;
363 }
364
365 if (ipv4_config.no_pmtu_disc)
366 inet->pmtudisc = IP_PMTUDISC_DONT;
367 else
368 inet->pmtudisc = IP_PMTUDISC_WANT;
369
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000370 inet->inet_id = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372 sock_init_data(sock, sk);
373
374 sk->sk_destruct = inet_sock_destruct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 sk->sk_protocol = protocol;
376 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
377
378 inet->uc_ttl = -1;
379 inet->mc_loop = 1;
380 inet->mc_ttl = 1;
Nivedita Singhvif771bef2009-05-28 07:00:46 +0000381 inet->mc_all = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 inet->mc_index = 0;
383 inet->mc_list = NULL;
384
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700385 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000387 if (inet->inet_num) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 /* It assumes that any protocol which allows
389 * the user to assign a number at socket
390 * creation time automatically
391 * shares.
392 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000393 inet->inet_sport = htons(inet->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 /* Add to protocol hash chains. */
395 sk->sk_prot->hash(sk);
396 }
397
398 if (sk->sk_prot->init) {
399 err = sk->sk_prot->init(sk);
400 if (err)
401 sk_common_release(sk);
402 }
403out:
404 return err;
405out_rcu_unlock:
406 rcu_read_unlock();
407 goto out;
408}
409
410
411/*
412 * The peer socket should always be NULL (or else). When we call this
413 * function we are destroying the object and from then on nobody
414 * should refer to it.
415 */
416int inet_release(struct socket *sock)
417{
418 struct sock *sk = sock->sk;
419
420 if (sk) {
421 long timeout;
422
David S. Millerc58dc012010-04-27 15:05:31 -0700423 sock_rps_reset_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700424
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 /* Applications forget to leave groups before exiting */
426 ip_mc_drop_socket(sk);
427
428 /* If linger is set, we don't return until the close
429 * is complete. Otherwise we return immediately. The
430 * actually closing is done the same either way.
431 *
432 * If the close is due to the process exiting, we never
433 * linger..
434 */
435 timeout = 0;
436 if (sock_flag(sk, SOCK_LINGER) &&
437 !(current->flags & PF_EXITING))
438 timeout = sk->sk_lingertime;
439 sock->sk = NULL;
440 sk->sk_prot->close(sk, timeout);
441 }
442 return 0;
443}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700444EXPORT_SYMBOL(inet_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
446/* It is off by default, see below. */
Brian Haleyab32ea52006-09-22 14:15:41 -0700447int sysctl_ip_nonlocal_bind __read_mostly;
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700448EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
451{
452 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
453 struct sock *sk = sock->sk;
454 struct inet_sock *inet = inet_sk(sk);
455 unsigned short snum;
456 int chk_addr_ret;
457 int err;
458
459 /* If the socket has its own bind function then use it. (RAW) */
460 if (sk->sk_prot->bind) {
461 err = sk->sk_prot->bind(sk, uaddr, addr_len);
462 goto out;
463 }
464 err = -EINVAL;
465 if (addr_len < sizeof(struct sockaddr_in))
466 goto out;
467
Marcus Meissnerc349a522011-07-04 01:30:29 +0000468 if (addr->sin_family != AF_INET) {
469 err = -EAFNOSUPPORT;
Marcus Meissnerd0733d22011-06-01 21:05:22 -0700470 goto out;
Marcus Meissnerc349a522011-07-04 01:30:29 +0000471 }
Marcus Meissnerd0733d22011-06-01 21:05:22 -0700472
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900473 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 /* Not specified by any standard per-se, however it breaks too
476 * many applications when removed. It is unfortunate since
477 * allowing applications to make a non-local bind solves
478 * several problems with systems using dynamic addressing.
479 * (ie. your servers still start up even if your ISDN link
480 * is temporarily down)
481 */
482 err = -EADDRNOTAVAIL;
483 if (!sysctl_ip_nonlocal_bind &&
Tóth László Attilab9fb1502008-10-01 07:31:24 -0700484 !(inet->freebind || inet->transparent) &&
Al Viroe6f1ceb2008-03-17 22:44:53 -0700485 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 chk_addr_ret != RTN_LOCAL &&
487 chk_addr_ret != RTN_MULTICAST &&
488 chk_addr_ret != RTN_BROADCAST)
489 goto out;
490
491 snum = ntohs(addr->sin_port);
492 err = -EACCES;
493 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
494 goto out;
495
496 /* We keep a pair of addresses. rcv_saddr is the one
497 * used by hash lookups, and saddr is used for transmit.
498 *
499 * In the BSD API these are the same except where it
500 * would be illegal to use them (multicast/broadcast) in
501 * which case the sending device address is used.
502 */
503 lock_sock(sk);
504
505 /* Check these errors (active socket, double bind). */
506 err = -EINVAL;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000507 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 goto out_release_sock;
509
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000510 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000512 inet->inet_saddr = 0; /* Use device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
514 /* Make sure we are allowed to bind here. */
515 if (sk->sk_prot->get_port(sk, snum)) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000516 inet->inet_saddr = inet->inet_rcv_saddr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 err = -EADDRINUSE;
518 goto out_release_sock;
519 }
520
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000521 if (inet->inet_rcv_saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
523 if (snum)
524 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000525 inet->inet_sport = htons(inet->inet_num);
526 inet->inet_daddr = 0;
527 inet->inet_dport = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 sk_dst_reset(sk);
529 err = 0;
530out_release_sock:
531 release_sock(sk);
532out:
533 return err;
534}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700535EXPORT_SYMBOL(inet_bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
537int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
538 int addr_len, int flags)
539{
540 struct sock *sk = sock->sk;
541
Changli Gao6503d962010-03-31 22:58:26 +0000542 if (addr_len < sizeof(uaddr->sa_family))
543 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 if (uaddr->sa_family == AF_UNSPEC)
545 return sk->sk_prot->disconnect(sk, flags);
546
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000547 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return -EAGAIN;
549 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
550}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700551EXPORT_SYMBOL(inet_dgram_connect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
553static long inet_wait_for_connect(struct sock *sk, long timeo)
554{
555 DEFINE_WAIT(wait);
556
Eric Dumazetaa395142010-04-20 13:03:51 +0000557 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
559 /* Basic assumption: if someone sets sk->sk_err, he _must_
560 * change state of the socket from TCP_SYN_*.
561 * Connect() does not allow to get error notifications
562 * without closing the socket.
563 */
564 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
565 release_sock(sk);
566 timeo = schedule_timeout(timeo);
567 lock_sock(sk);
568 if (signal_pending(current) || !timeo)
569 break;
Eric Dumazetaa395142010-04-20 13:03:51 +0000570 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 }
Eric Dumazetaa395142010-04-20 13:03:51 +0000572 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 return timeo;
574}
575
576/*
577 * Connect to a remote host. There is regrettably still a little
578 * TCP 'magic' in here.
579 */
580int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
581 int addr_len, int flags)
582{
583 struct sock *sk = sock->sk;
584 int err;
585 long timeo;
586
Changli Gao6503d962010-03-31 22:58:26 +0000587 if (addr_len < sizeof(uaddr->sa_family))
588 return -EINVAL;
589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 lock_sock(sk);
591
592 if (uaddr->sa_family == AF_UNSPEC) {
593 err = sk->sk_prot->disconnect(sk, flags);
594 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
595 goto out;
596 }
597
598 switch (sock->state) {
599 default:
600 err = -EINVAL;
601 goto out;
602 case SS_CONNECTED:
603 err = -EISCONN;
604 goto out;
605 case SS_CONNECTING:
606 err = -EALREADY;
607 /* Fall out of switch with err, set for this state */
608 break;
609 case SS_UNCONNECTED:
610 err = -EISCONN;
611 if (sk->sk_state != TCP_CLOSE)
612 goto out;
613
614 err = sk->sk_prot->connect(sk, uaddr, addr_len);
615 if (err < 0)
616 goto out;
617
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900618 sock->state = SS_CONNECTING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
620 /* Just entered SS_CONNECTING state; the only
621 * difference is that return value in non-blocking
622 * case is EINPROGRESS, rather than EALREADY.
623 */
624 err = -EINPROGRESS;
625 break;
626 }
627
628 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
629
630 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
631 /* Error code is set above */
632 if (!timeo || !inet_wait_for_connect(sk, timeo))
633 goto out;
634
635 err = sock_intr_errno(timeo);
636 if (signal_pending(current))
637 goto out;
638 }
639
640 /* Connection was closed by RST, timeout, ICMP error
641 * or another process disconnected us.
642 */
643 if (sk->sk_state == TCP_CLOSE)
644 goto sock_error;
645
646 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
647 * and error was received after socket entered established state.
648 * Hence, it is handled normally after connect() return successfully.
649 */
650
651 sock->state = SS_CONNECTED;
652 err = 0;
653out:
654 release_sock(sk);
655 return err;
656
657sock_error:
658 err = sock_error(sk) ? : -ECONNABORTED;
659 sock->state = SS_UNCONNECTED;
660 if (sk->sk_prot->disconnect(sk, flags))
661 sock->state = SS_DISCONNECTING;
662 goto out;
663}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700664EXPORT_SYMBOL(inet_stream_connect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
666/*
667 * Accept a pending connection. The TCP layer now gives BSD semantics.
668 */
669
670int inet_accept(struct socket *sock, struct socket *newsock, int flags)
671{
672 struct sock *sk1 = sock->sk;
673 int err = -EINVAL;
674 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
675
676 if (!sk2)
677 goto do_err;
678
679 lock_sock(sk2);
680
Eric Dumazet1eddcea2011-06-17 03:45:15 +0000681 sock_rps_record_flow(sk2);
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700682 WARN_ON(!((1 << sk2->sk_state) &
683 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
685 sock_graft(sk2, newsock);
686
687 newsock->state = SS_CONNECTED;
688 err = 0;
689 release_sock(sk2);
690do_err:
691 return err;
692}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700693EXPORT_SYMBOL(inet_accept);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
695
696/*
697 * This does both peername and sockname.
698 */
699int inet_getname(struct socket *sock, struct sockaddr *uaddr,
700 int *uaddr_len, int peer)
701{
702 struct sock *sk = sock->sk;
703 struct inet_sock *inet = inet_sk(sk);
Cyrill Gorcunov38bfd8f2009-10-29 02:59:18 -0700704 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
706 sin->sin_family = AF_INET;
707 if (peer) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000708 if (!inet->inet_dport ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
710 peer == 1))
711 return -ENOTCONN;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000712 sin->sin_port = inet->inet_dport;
713 sin->sin_addr.s_addr = inet->inet_daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 } else {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000715 __be32 addr = inet->inet_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 if (!addr)
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000717 addr = inet->inet_saddr;
718 sin->sin_port = inet->inet_sport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 sin->sin_addr.s_addr = addr;
720 }
721 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
722 *uaddr_len = sizeof(*sin);
723 return 0;
724}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700725EXPORT_SYMBOL(inet_getname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
727int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
728 size_t size)
729{
730 struct sock *sk = sock->sk;
731
David S. Millerc58dc012010-04-27 15:05:31 -0700732 sock_rps_record_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700733
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 /* We may need to bind the socket. */
Changli Gao7ba42912010-07-10 20:41:55 +0000735 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
736 inet_autobind(sk))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 return -EAGAIN;
738
739 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
740}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700741EXPORT_SYMBOL(inet_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
Changli Gao7ba42912010-07-10 20:41:55 +0000743ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
744 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745{
746 struct sock *sk = sock->sk;
747
David S. Millerc58dc012010-04-27 15:05:31 -0700748 sock_rps_record_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 /* We may need to bind the socket. */
Changli Gao7ba42912010-07-10 20:41:55 +0000751 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
752 inet_autobind(sk))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 return -EAGAIN;
754
755 if (sk->sk_prot->sendpage)
756 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
757 return sock_no_sendpage(sock, page, offset, size, flags);
758}
Changli Gao7ba42912010-07-10 20:41:55 +0000759EXPORT_SYMBOL(inet_sendpage);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Tom Herbertfec5e652010-04-16 16:01:27 -0700761int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
762 size_t size, int flags)
763{
764 struct sock *sk = sock->sk;
765 int addr_len = 0;
766 int err;
767
David S. Millerc58dc012010-04-27 15:05:31 -0700768 sock_rps_record_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700769
770 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
771 flags & ~MSG_DONTWAIT, &addr_len);
772 if (err >= 0)
773 msg->msg_namelen = addr_len;
774 return err;
775}
776EXPORT_SYMBOL(inet_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
778int inet_shutdown(struct socket *sock, int how)
779{
780 struct sock *sk = sock->sk;
781 int err = 0;
782
783 /* This should really check to make sure
784 * the socket is a TCP socket. (WHY AC...)
785 */
786 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
787 1->2 bit 2 snds.
788 2->3 */
789 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
790 return -EINVAL;
791
792 lock_sock(sk);
793 if (sock->state == SS_CONNECTING) {
794 if ((1 << sk->sk_state) &
795 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
796 sock->state = SS_DISCONNECTING;
797 else
798 sock->state = SS_CONNECTED;
799 }
800
801 switch (sk->sk_state) {
802 case TCP_CLOSE:
803 err = -ENOTCONN;
804 /* Hack to wake up other listeners, who can poll for
805 POLLHUP, even on eg. unconnected UDP sockets -- RR */
806 default:
807 sk->sk_shutdown |= how;
808 if (sk->sk_prot->shutdown)
809 sk->sk_prot->shutdown(sk, how);
810 break;
811
812 /* Remaining two branches are temporary solution for missing
813 * close() in multithreaded environment. It is _not_ a good idea,
814 * but we have no choice until close() is repaired at VFS level.
815 */
816 case TCP_LISTEN:
817 if (!(how & RCV_SHUTDOWN))
818 break;
819 /* Fall through */
820 case TCP_SYN_SENT:
821 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
822 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
823 break;
824 }
825
826 /* Wake up anyone sleeping in poll. */
827 sk->sk_state_change(sk);
828 release_sock(sk);
829 return err;
830}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700831EXPORT_SYMBOL(inet_shutdown);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
833/*
834 * ioctl() calls you can issue on an INET socket. Most of these are
835 * device configuration and stuff and very rarely used. Some ioctls
836 * pass on to the socket itself.
837 *
838 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
839 * loads the devconfigure module does its configuring and unloads it.
840 * There's a good 20K of config code hanging around the kernel.
841 */
842
843int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
844{
845 struct sock *sk = sock->sk;
846 int err = 0;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900847 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848
849 switch (cmd) {
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700850 case SIOCGSTAMP:
851 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
852 break;
853 case SIOCGSTAMPNS:
854 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
855 break;
856 case SIOCADDRT:
857 case SIOCDELRT:
858 case SIOCRTMSG:
859 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
860 break;
861 case SIOCDARP:
862 case SIOCGARP:
863 case SIOCSARP:
864 err = arp_ioctl(net, cmd, (void __user *)arg);
865 break;
866 case SIOCGIFADDR:
867 case SIOCSIFADDR:
868 case SIOCGIFBRDADDR:
869 case SIOCSIFBRDADDR:
870 case SIOCGIFNETMASK:
871 case SIOCSIFNETMASK:
872 case SIOCGIFDSTADDR:
873 case SIOCSIFDSTADDR:
874 case SIOCSIFPFLAGS:
875 case SIOCGIFPFLAGS:
876 case SIOCSIFFLAGS:
877 err = devinet_ioctl(net, cmd, (void __user *)arg);
878 break;
879 default:
880 if (sk->sk_prot->ioctl)
881 err = sk->sk_prot->ioctl(sk, cmd, arg);
882 else
883 err = -ENOIOCTLCMD;
884 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 }
886 return err;
887}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700888EXPORT_SYMBOL(inet_ioctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000890#ifdef CONFIG_COMPAT
891int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
892{
893 struct sock *sk = sock->sk;
894 int err = -ENOIOCTLCMD;
895
896 if (sk->sk_prot->compat_ioctl)
897 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
898
899 return err;
900}
901#endif
902
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800903const struct proto_ops inet_stream_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800904 .family = PF_INET,
905 .owner = THIS_MODULE,
906 .release = inet_release,
907 .bind = inet_bind,
908 .connect = inet_stream_connect,
909 .socketpair = sock_no_socketpair,
910 .accept = inet_accept,
911 .getname = inet_getname,
912 .poll = tcp_poll,
913 .ioctl = inet_ioctl,
914 .listen = inet_listen,
915 .shutdown = inet_shutdown,
916 .setsockopt = sock_common_setsockopt,
917 .getsockopt = sock_common_getsockopt,
Changli Gao7ba42912010-07-10 20:41:55 +0000918 .sendmsg = inet_sendmsg,
Tom Herbertfec5e652010-04-16 16:01:27 -0700919 .recvmsg = inet_recvmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800920 .mmap = sock_no_mmap,
Changli Gao7ba42912010-07-10 20:41:55 +0000921 .sendpage = inet_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800922 .splice_read = tcp_splice_read,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800923#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800924 .compat_setsockopt = compat_sock_common_setsockopt,
925 .compat_getsockopt = compat_sock_common_getsockopt,
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000926 .compat_ioctl = inet_compat_ioctl,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800927#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928};
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700929EXPORT_SYMBOL(inet_stream_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800931const struct proto_ops inet_dgram_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800932 .family = PF_INET,
933 .owner = THIS_MODULE,
934 .release = inet_release,
935 .bind = inet_bind,
936 .connect = inet_dgram_connect,
937 .socketpair = sock_no_socketpair,
938 .accept = sock_no_accept,
939 .getname = inet_getname,
940 .poll = udp_poll,
941 .ioctl = inet_ioctl,
942 .listen = sock_no_listen,
943 .shutdown = inet_shutdown,
944 .setsockopt = sock_common_setsockopt,
945 .getsockopt = sock_common_getsockopt,
946 .sendmsg = inet_sendmsg,
Tom Herbertfec5e652010-04-16 16:01:27 -0700947 .recvmsg = inet_recvmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800948 .mmap = sock_no_mmap,
949 .sendpage = inet_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800950#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800951 .compat_setsockopt = compat_sock_common_setsockopt,
952 .compat_getsockopt = compat_sock_common_getsockopt,
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000953 .compat_ioctl = inet_compat_ioctl,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800954#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955};
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700956EXPORT_SYMBOL(inet_dgram_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
958/*
959 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
960 * udp_poll
961 */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800962static const struct proto_ops inet_sockraw_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800963 .family = PF_INET,
964 .owner = THIS_MODULE,
965 .release = inet_release,
966 .bind = inet_bind,
967 .connect = inet_dgram_connect,
968 .socketpair = sock_no_socketpair,
969 .accept = sock_no_accept,
970 .getname = inet_getname,
971 .poll = datagram_poll,
972 .ioctl = inet_ioctl,
973 .listen = sock_no_listen,
974 .shutdown = inet_shutdown,
975 .setsockopt = sock_common_setsockopt,
976 .getsockopt = sock_common_getsockopt,
977 .sendmsg = inet_sendmsg,
Tom Herbertfec5e652010-04-16 16:01:27 -0700978 .recvmsg = inet_recvmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800979 .mmap = sock_no_mmap,
980 .sendpage = inet_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800981#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800982 .compat_setsockopt = compat_sock_common_setsockopt,
983 .compat_getsockopt = compat_sock_common_getsockopt,
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000984 .compat_ioctl = inet_compat_ioctl,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800985#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986};
987
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +0000988static const struct net_proto_family inet_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 .family = PF_INET,
990 .create = inet_create,
991 .owner = THIS_MODULE,
992};
993
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994/* Upon startup we insert all the elements in inetsw_array[] into
995 * the linked list inetsw.
996 */
997static struct inet_protosw inetsw_array[] =
998{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900999 {
1000 .type = SOCK_STREAM,
1001 .protocol = IPPROTO_TCP,
1002 .prot = &tcp_prot,
1003 .ops = &inet_stream_ops,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001004 .no_check = 0,
1005 .flags = INET_PROTOSW_PERMANENT |
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001006 INET_PROTOSW_ICSK,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001007 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001009 {
1010 .type = SOCK_DGRAM,
1011 .protocol = IPPROTO_UDP,
1012 .prot = &udp_prot,
1013 .ops = &inet_dgram_ops,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001014 .no_check = UDP_CSUM_DEFAULT,
1015 .flags = INET_PROTOSW_PERMANENT,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 },
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001017
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001018 {
1019 .type = SOCK_DGRAM,
1020 .protocol = IPPROTO_ICMP,
1021 .prot = &ping_prot,
1022 .ops = &inet_dgram_ops,
1023 .no_check = UDP_CSUM_DEFAULT,
1024 .flags = INET_PROTOSW_REUSE,
1025 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
1027 {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001028 .type = SOCK_RAW,
1029 .protocol = IPPROTO_IP, /* wild card */
1030 .prot = &raw_prot,
1031 .ops = &inet_sockraw_ops,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001032 .no_check = UDP_CSUM_DEFAULT,
1033 .flags = INET_PROTOSW_REUSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 }
1035};
1036
Denis Chengc40f6ff2007-09-16 16:39:25 -07001037#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
1039void inet_register_protosw(struct inet_protosw *p)
1040{
1041 struct list_head *lh;
1042 struct inet_protosw *answer;
1043 int protocol = p->protocol;
1044 struct list_head *last_perm;
1045
1046 spin_lock_bh(&inetsw_lock);
1047
1048 if (p->type >= SOCK_MAX)
1049 goto out_illegal;
1050
1051 /* If we are trying to override a permanent protocol, bail. */
1052 answer = NULL;
1053 last_perm = &inetsw[p->type];
1054 list_for_each(lh, &inetsw[p->type]) {
1055 answer = list_entry(lh, struct inet_protosw, list);
1056
1057 /* Check only the non-wild match. */
1058 if (INET_PROTOSW_PERMANENT & answer->flags) {
1059 if (protocol == answer->protocol)
1060 break;
1061 last_perm = lh;
1062 }
1063
1064 answer = NULL;
1065 }
1066 if (answer)
1067 goto out_permanent;
1068
1069 /* Add the new entry after the last permanent entry if any, so that
1070 * the new entry does not override a permanent entry when matched with
1071 * a wild-card protocol. But it is allowed to override any existing
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001072 * non-permanent entry. This means that when we remove this entry, the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 * system automatically returns to the old behavior.
1074 */
1075 list_add_rcu(&p->list, last_perm);
1076out:
1077 spin_unlock_bh(&inetsw_lock);
1078
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 return;
1080
1081out_permanent:
1082 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
1083 protocol);
1084 goto out;
1085
1086out_illegal:
1087 printk(KERN_ERR
1088 "Ignoring attempt to register invalid socket type %d.\n",
1089 p->type);
1090 goto out;
1091}
Eric Dumazet3d1427f2009-08-28 23:45:21 -07001092EXPORT_SYMBOL(inet_register_protosw);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
1094void inet_unregister_protosw(struct inet_protosw *p)
1095{
1096 if (INET_PROTOSW_PERMANENT & p->flags) {
1097 printk(KERN_ERR
1098 "Attempt to unregister permanent protocol %d.\n",
1099 p->protocol);
1100 } else {
1101 spin_lock_bh(&inetsw_lock);
1102 list_del_rcu(&p->list);
1103 spin_unlock_bh(&inetsw_lock);
1104
1105 synchronize_net();
1106 }
1107}
Eric Dumazet3d1427f2009-08-28 23:45:21 -07001108EXPORT_SYMBOL(inet_unregister_protosw);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001110/*
1111 * Shall we try to damage output packets if routing dev changes?
1112 */
1113
Brian Haleyab32ea52006-09-22 14:15:41 -07001114int sysctl_ip_dynaddr __read_mostly;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001115
1116static int inet_sk_reselect_saddr(struct sock *sk)
1117{
1118 struct inet_sock *inet = inet_sk(sk);
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001119 __be32 old_saddr = inet->inet_saddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001120 __be32 daddr = inet->inet_daddr;
David S. Miller6e869132011-05-06 16:18:04 -07001121 struct flowi4 *fl4;
David S. Millerb23dd4f2011-03-02 14:31:35 -08001122 struct rtable *rt;
1123 __be32 new_saddr;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001124 struct ip_options_rcu *inet_opt;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001125
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001126 inet_opt = rcu_dereference_protected(inet->inet_opt,
1127 sock_owned_by_user(sk));
1128 if (inet_opt && inet_opt->opt.srr)
1129 daddr = inet_opt->opt.faddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001130
1131 /* Query new route. */
David S. Miller6e869132011-05-06 16:18:04 -07001132 fl4 = &inet->cork.fl.u.ip4;
1133 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
David S. Millerb23dd4f2011-03-02 14:31:35 -08001134 sk->sk_bound_dev_if, sk->sk_protocol,
1135 inet->inet_sport, inet->inet_dport, sk, false);
1136 if (IS_ERR(rt))
1137 return PTR_ERR(rt);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001138
Changli Gaod8d1f302010-06-10 23:31:35 -07001139 sk_setup_caps(sk, &rt->dst);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001140
David S. Miller6e869132011-05-06 16:18:04 -07001141 new_saddr = fl4->saddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001142
1143 if (new_saddr == old_saddr)
1144 return 0;
1145
1146 if (sysctl_ip_dynaddr > 1) {
Harvey Harrison673d57e2008-10-31 00:53:57 -07001147 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n",
1148 __func__, &old_saddr, &new_saddr);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001149 }
1150
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001151 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001152
1153 /*
1154 * XXX The only one ugly spot where we need to
1155 * XXX really change the sockets identity after
1156 * XXX it has entered the hashes. -DaveM
1157 *
1158 * Besides that, it does not check for connection
1159 * uniqueness. Wait for troubles.
1160 */
1161 __sk_prot_rehash(sk);
1162 return 0;
1163}
1164
1165int inet_sk_rebuild_header(struct sock *sk)
1166{
1167 struct inet_sock *inet = inet_sk(sk);
1168 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
Al Viro3ca3c682006-09-27 18:28:07 -07001169 __be32 daddr;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001170 struct ip_options_rcu *inet_opt;
David S. Miller6e869132011-05-06 16:18:04 -07001171 struct flowi4 *fl4;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001172 int err;
1173
1174 /* Route is OK, nothing to do. */
1175 if (rt)
1176 return 0;
1177
1178 /* Reroute. */
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001179 rcu_read_lock();
1180 inet_opt = rcu_dereference(inet->inet_opt);
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001181 daddr = inet->inet_daddr;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001182 if (inet_opt && inet_opt->opt.srr)
1183 daddr = inet_opt->opt.faddr;
1184 rcu_read_unlock();
David S. Miller6e869132011-05-06 16:18:04 -07001185 fl4 = &inet->cork.fl.u.ip4;
1186 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
David S. Miller78fbfd82011-03-12 00:00:52 -05001187 inet->inet_dport, inet->inet_sport,
1188 sk->sk_protocol, RT_CONN_FLAGS(sk),
1189 sk->sk_bound_dev_if);
David S. Millerb23dd4f2011-03-02 14:31:35 -08001190 if (!IS_ERR(rt)) {
1191 err = 0;
Changli Gaod8d1f302010-06-10 23:31:35 -07001192 sk_setup_caps(sk, &rt->dst);
David S. Millerb23dd4f2011-03-02 14:31:35 -08001193 } else {
1194 err = PTR_ERR(rt);
1195
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001196 /* Routing failed... */
1197 sk->sk_route_caps = 0;
1198 /*
1199 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1200 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1201 */
1202 if (!sysctl_ip_dynaddr ||
1203 sk->sk_state != TCP_SYN_SENT ||
1204 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1205 (err = inet_sk_reselect_saddr(sk)) != 0)
1206 sk->sk_err_soft = -err;
1207 }
1208
1209 return err;
1210}
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001211EXPORT_SYMBOL(inet_sk_rebuild_header);
1212
Herbert Xua430a432006-07-08 13:34:56 -07001213static int inet_gso_send_check(struct sk_buff *skb)
1214{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001215 const struct iphdr *iph;
Alexey Dobriyan32613092009-09-14 12:21:47 +00001216 const struct net_protocol *ops;
Herbert Xua430a432006-07-08 13:34:56 -07001217 int proto;
1218 int ihl;
1219 int err = -EINVAL;
1220
1221 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1222 goto out;
1223
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001224 iph = ip_hdr(skb);
Herbert Xua430a432006-07-08 13:34:56 -07001225 ihl = iph->ihl * 4;
1226 if (ihl < sizeof(*iph))
1227 goto out;
1228
1229 if (unlikely(!pskb_may_pull(skb, ihl)))
1230 goto out;
1231
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001232 __skb_pull(skb, ihl);
1233 skb_reset_transport_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001234 iph = ip_hdr(skb);
Herbert Xua430a432006-07-08 13:34:56 -07001235 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1236 err = -EPROTONOSUPPORT;
1237
1238 rcu_read_lock();
1239 ops = rcu_dereference(inet_protos[proto]);
1240 if (likely(ops && ops->gso_send_check))
1241 err = ops->gso_send_check(skb);
1242 rcu_read_unlock();
1243
1244out:
1245 return err;
1246}
1247
Michał Mirosław04ed3e72011-01-24 15:32:47 -08001248static struct sk_buff *inet_gso_segment(struct sk_buff *skb, u32 features)
Herbert Xuf4c50d92006-06-22 03:02:40 -07001249{
1250 struct sk_buff *segs = ERR_PTR(-EINVAL);
1251 struct iphdr *iph;
Alexey Dobriyan32613092009-09-14 12:21:47 +00001252 const struct net_protocol *ops;
Herbert Xuf4c50d92006-06-22 03:02:40 -07001253 int proto;
1254 int ihl;
1255 int id;
Sridhar Samudralad7ca4cc2009-07-09 08:09:47 +00001256 unsigned int offset = 0;
Herbert Xuf4c50d92006-06-22 03:02:40 -07001257
Stephen Hemmingerd212f872007-06-27 00:47:37 -07001258 if (!(features & NETIF_F_V4_CSUM))
1259 features &= ~NETIF_F_SG;
1260
Herbert Xubbcf4672006-07-03 19:38:35 -07001261 if (unlikely(skb_shinfo(skb)->gso_type &
1262 ~(SKB_GSO_TCPV4 |
1263 SKB_GSO_UDP |
1264 SKB_GSO_DODGY |
1265 SKB_GSO_TCP_ECN |
1266 0)))
1267 goto out;
1268
1269 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001270 goto out;
1271
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001272 iph = ip_hdr(skb);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001273 ihl = iph->ihl * 4;
1274 if (ihl < sizeof(*iph))
1275 goto out;
1276
Herbert Xubbcf4672006-07-03 19:38:35 -07001277 if (unlikely(!pskb_may_pull(skb, ihl)))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001278 goto out;
1279
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001280 __skb_pull(skb, ihl);
1281 skb_reset_transport_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001282 iph = ip_hdr(skb);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001283 id = ntohs(iph->id);
1284 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1285 segs = ERR_PTR(-EPROTONOSUPPORT);
1286
1287 rcu_read_lock();
1288 ops = rcu_dereference(inet_protos[proto]);
Herbert Xubbcf4672006-07-03 19:38:35 -07001289 if (likely(ops && ops->gso_segment))
Herbert Xu576a30e2006-06-27 13:22:38 -07001290 segs = ops->gso_segment(skb, features);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001291 rcu_read_unlock();
1292
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001293 if (!segs || IS_ERR(segs))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001294 goto out;
1295
1296 skb = segs;
1297 do {
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001298 iph = ip_hdr(skb);
Sridhar Samudralad7ca4cc2009-07-09 08:09:47 +00001299 if (proto == IPPROTO_UDP) {
1300 iph->id = htons(id);
1301 iph->frag_off = htons(offset >> 3);
1302 if (skb->next != NULL)
1303 iph->frag_off |= htons(IP_MF);
1304 offset += (skb->len - skb->mac_len - iph->ihl * 4);
1305 } else
1306 iph->id = htons(id++);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001307 iph->tot_len = htons(skb->len - skb->mac_len);
1308 iph->check = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001309 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001310 } while ((skb = skb->next));
1311
1312out:
1313 return segs;
1314}
1315
Herbert Xu73cc19f2008-12-15 23:41:09 -08001316static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1317 struct sk_buff *skb)
1318{
Alexey Dobriyan32613092009-09-14 12:21:47 +00001319 const struct net_protocol *ops;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001320 struct sk_buff **pp = NULL;
1321 struct sk_buff *p;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001322 const struct iphdr *iph;
Herbert Xua5b1cf22009-05-26 18:50:28 +00001323 unsigned int hlen;
1324 unsigned int off;
Herbert Xu1075f3f2009-05-26 18:50:29 +00001325 unsigned int id;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001326 int flush = 1;
1327 int proto;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001328
Herbert Xua5b1cf22009-05-26 18:50:28 +00001329 off = skb_gro_offset(skb);
1330 hlen = off + sizeof(*iph);
1331 iph = skb_gro_header_fast(skb, off);
1332 if (skb_gro_header_hard(skb, hlen)) {
1333 iph = skb_gro_header_slow(skb, hlen, off);
1334 if (unlikely(!iph))
1335 goto out;
1336 }
Herbert Xu73cc19f2008-12-15 23:41:09 -08001337
Herbert Xu73cc19f2008-12-15 23:41:09 -08001338 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1339
1340 rcu_read_lock();
1341 ops = rcu_dereference(inet_protos[proto]);
1342 if (!ops || !ops->gro_receive)
1343 goto out_unlock;
1344
Herbert Xua5ad24b2009-02-08 18:00:39 +00001345 if (*(u8 *)iph != 0x45)
Herbert Xu73cc19f2008-12-15 23:41:09 -08001346 goto out_unlock;
1347
1348 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1349 goto out_unlock;
1350
Eric Dumazet0eae88f2010-04-20 19:06:52 -07001351 id = ntohl(*(__be32 *)&iph->id);
1352 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
Herbert Xu1075f3f2009-05-26 18:50:29 +00001353 id >>= 16;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001354
1355 for (p = *head; p; p = p->next) {
1356 struct iphdr *iph2;
1357
1358 if (!NAPI_GRO_CB(p)->same_flow)
1359 continue;
1360
1361 iph2 = ip_hdr(p);
1362
Herbert Xua5ad24b2009-02-08 18:00:39 +00001363 if ((iph->protocol ^ iph2->protocol) |
1364 (iph->tos ^ iph2->tos) |
Eric Dumazet0eae88f2010-04-20 19:06:52 -07001365 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1366 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
Herbert Xu73cc19f2008-12-15 23:41:09 -08001367 NAPI_GRO_CB(p)->same_flow = 0;
1368 continue;
1369 }
1370
1371 /* All fields must match except length and checksum. */
1372 NAPI_GRO_CB(p)->flush |=
Herbert Xua5ad24b2009-02-08 18:00:39 +00001373 (iph->ttl ^ iph2->ttl) |
1374 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
Herbert Xu73cc19f2008-12-15 23:41:09 -08001375
1376 NAPI_GRO_CB(p)->flush |= flush;
1377 }
1378
1379 NAPI_GRO_CB(skb)->flush |= flush;
Herbert Xu86911732009-01-29 14:19:50 +00001380 skb_gro_pull(skb, sizeof(*iph));
1381 skb_set_transport_header(skb, skb_gro_offset(skb));
Herbert Xu73cc19f2008-12-15 23:41:09 -08001382
1383 pp = ops->gro_receive(head, skb);
1384
1385out_unlock:
1386 rcu_read_unlock();
1387
1388out:
1389 NAPI_GRO_CB(skb)->flush |= flush;
1390
1391 return pp;
1392}
1393
1394static int inet_gro_complete(struct sk_buff *skb)
1395{
Alexey Dobriyan32613092009-09-14 12:21:47 +00001396 const struct net_protocol *ops;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001397 struct iphdr *iph = ip_hdr(skb);
1398 int proto = iph->protocol & (MAX_INET_PROTOS - 1);
1399 int err = -ENOSYS;
1400 __be16 newlen = htons(skb->len - skb_network_offset(skb));
1401
1402 csum_replace2(&iph->check, iph->tot_len, newlen);
1403 iph->tot_len = newlen;
1404
1405 rcu_read_lock();
1406 ops = rcu_dereference(inet_protos[proto]);
1407 if (WARN_ON(!ops || !ops->gro_complete))
1408 goto out_unlock;
1409
1410 err = ops->gro_complete(skb);
1411
1412out_unlock:
1413 rcu_read_unlock();
1414
1415 return err;
1416}
1417
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001418int inet_ctl_sock_create(struct sock **sk, unsigned short family,
Denis V. Lunev56772422008-04-03 14:28:30 -07001419 unsigned short type, unsigned char protocol,
1420 struct net *net)
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001421{
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001422 struct socket *sock;
1423 int rc = sock_create_kern(family, type, protocol, &sock);
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001424
1425 if (rc == 0) {
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001426 *sk = sock->sk;
1427 (*sk)->sk_allocation = GFP_ATOMIC;
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001428 /*
1429 * Unhash it so that IP input processing does not even see it,
1430 * we do not wish this socket to see incoming packets.
1431 */
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001432 (*sk)->sk_prot->unhash(*sk);
Denis V. Lunev56772422008-04-03 14:28:30 -07001433
1434 sk_change_net(*sk, net);
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001435 }
1436 return rc;
1437}
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001438EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1439
Tejun Heo7d720c32010-02-16 15:20:26 +00001440unsigned long snmp_fold_field(void __percpu *mib[], int offt)
Herbert Xu5e0f0432007-04-24 21:53:35 -07001441{
1442 unsigned long res = 0;
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001443 int i, j;
Herbert Xu5e0f0432007-04-24 21:53:35 -07001444
1445 for_each_possible_cpu(i) {
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001446 for (j = 0; j < SNMP_ARRAY_SZ; j++)
1447 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt);
Herbert Xu5e0f0432007-04-24 21:53:35 -07001448 }
1449 return res;
1450}
1451EXPORT_SYMBOL_GPL(snmp_fold_field);
1452
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001453#if BITS_PER_LONG==32
1454
1455u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset)
1456{
1457 u64 res = 0;
1458 int cpu;
1459
1460 for_each_possible_cpu(cpu) {
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001461 void *bhptr;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001462 struct u64_stats_sync *syncp;
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001463 u64 v;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001464 unsigned int start;
1465
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001466 bhptr = per_cpu_ptr(mib[0], cpu);
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001467 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1468 do {
1469 start = u64_stats_fetch_begin_bh(syncp);
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001470 v = *(((u64 *) bhptr) + offt);
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001471 } while (u64_stats_fetch_retry_bh(syncp, start));
1472
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001473 res += v;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001474 }
1475 return res;
1476}
1477EXPORT_SYMBOL_GPL(snmp_fold_field64);
1478#endif
1479
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001480int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align)
Herbert Xu5e0f0432007-04-24 21:53:35 -07001481{
1482 BUG_ON(ptr == NULL);
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001483 ptr[0] = __alloc_percpu(mibsize, align);
Herbert Xu5e0f0432007-04-24 21:53:35 -07001484 if (!ptr[0])
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001485 return -ENOMEM;
1486#if SNMP_ARRAY_SZ == 2
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001487 ptr[1] = __alloc_percpu(mibsize, align);
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001488 if (!ptr[1]) {
1489 free_percpu(ptr[0]);
1490 ptr[0] = NULL;
1491 return -ENOMEM;
1492 }
1493#endif
Herbert Xu5e0f0432007-04-24 21:53:35 -07001494 return 0;
Herbert Xu5e0f0432007-04-24 21:53:35 -07001495}
1496EXPORT_SYMBOL_GPL(snmp_mib_init);
1497
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001498void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ])
Herbert Xu5e0f0432007-04-24 21:53:35 -07001499{
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001500 int i;
1501
Herbert Xu5e0f0432007-04-24 21:53:35 -07001502 BUG_ON(ptr == NULL);
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001503 for (i = 0; i < SNMP_ARRAY_SZ; i++) {
1504 free_percpu(ptr[i]);
1505 ptr[i] = NULL;
1506 }
Herbert Xu5e0f0432007-04-24 21:53:35 -07001507}
1508EXPORT_SYMBOL_GPL(snmp_mib_free);
1509
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510#ifdef CONFIG_IP_MULTICAST
Alexey Dobriyan32613092009-09-14 12:21:47 +00001511static const struct net_protocol igmp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 .handler = igmp_rcv,
Alexey Dobriyanb4ee07d2008-12-25 16:42:23 -08001513 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514};
1515#endif
1516
Alexey Dobriyan32613092009-09-14 12:21:47 +00001517static const struct net_protocol tcp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518 .handler = tcp_v4_rcv,
1519 .err_handler = tcp_v4_err,
Herbert Xua430a432006-07-08 13:34:56 -07001520 .gso_send_check = tcp_v4_gso_send_check,
Herbert Xuf4c50d92006-06-22 03:02:40 -07001521 .gso_segment = tcp_tso_segment,
Herbert Xubf296b12008-12-15 23:43:36 -08001522 .gro_receive = tcp4_gro_receive,
1523 .gro_complete = tcp4_gro_complete,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001525 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526};
1527
Alexey Dobriyan32613092009-09-14 12:21:47 +00001528static const struct net_protocol udp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 .handler = udp_rcv,
1530 .err_handler = udp_err,
Sridhar Samudralad7ca4cc2009-07-09 08:09:47 +00001531 .gso_send_check = udp4_ufo_send_check,
1532 .gso_segment = udp4_ufo_fragment,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001534 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535};
1536
Alexey Dobriyan32613092009-09-14 12:21:47 +00001537static const struct net_protocol icmp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 .handler = icmp_rcv,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001539 .err_handler = ping_err,
Herbert Xu8b7817f2007-12-12 10:44:43 -08001540 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001541 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542};
1543
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001544static __net_init int ipv4_mib_init_net(struct net *net)
1545{
Tejun Heo7d720c32010-02-16 15:20:26 +00001546 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001547 sizeof(struct tcp_mib),
1548 __alignof__(struct tcp_mib)) < 0)
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001549 goto err_tcp_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001550 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001551 sizeof(struct ipstats_mib),
1552 __alignof__(struct ipstats_mib)) < 0)
Pavel Emelyanova20f5792008-07-18 04:02:42 -07001553 goto err_ip_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001554 if (snmp_mib_init((void __percpu **)net->mib.net_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001555 sizeof(struct linux_mib),
1556 __alignof__(struct linux_mib)) < 0)
Pavel Emelyanov61a7e262008-07-18 04:03:08 -07001557 goto err_net_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001558 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001559 sizeof(struct udp_mib),
1560 __alignof__(struct udp_mib)) < 0)
Pavel Emelyanov2f275f92008-07-18 04:03:27 -07001561 goto err_udp_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001562 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001563 sizeof(struct udp_mib),
1564 __alignof__(struct udp_mib)) < 0)
Pavel Emelyanov386019d2008-07-18 04:03:45 -07001565 goto err_udplite_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001566 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001567 sizeof(struct icmp_mib),
1568 __alignof__(struct icmp_mib)) < 0)
Pavel Emelyanovb60538a2008-07-18 04:04:02 -07001569 goto err_icmp_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001570 if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001571 sizeof(struct icmpmsg_mib),
1572 __alignof__(struct icmpmsg_mib)) < 0)
Pavel Emelyanov923c6582008-07-18 04:04:22 -07001573 goto err_icmpmsg_mib;
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001574
1575 tcp_mib_init(net);
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001576 return 0;
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001577
Pavel Emelyanov923c6582008-07-18 04:04:22 -07001578err_icmpmsg_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001579 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
Pavel Emelyanovb60538a2008-07-18 04:04:02 -07001580err_icmp_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001581 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
Pavel Emelyanov386019d2008-07-18 04:03:45 -07001582err_udplite_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001583 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
Pavel Emelyanov2f275f92008-07-18 04:03:27 -07001584err_udp_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001585 snmp_mib_free((void __percpu **)net->mib.net_statistics);
Pavel Emelyanov61a7e262008-07-18 04:03:08 -07001586err_net_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001587 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
Pavel Emelyanova20f5792008-07-18 04:02:42 -07001588err_ip_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001589 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001590err_tcp_mib:
1591 return -ENOMEM;
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001592}
1593
1594static __net_exit void ipv4_mib_exit_net(struct net *net)
1595{
Tejun Heo7d720c32010-02-16 15:20:26 +00001596 snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics);
1597 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1598 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1599 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1600 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1601 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1602 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001603}
1604
1605static __net_initdata struct pernet_operations ipv4_mib_ops = {
1606 .init = ipv4_mib_init_net,
1607 .exit = ipv4_mib_exit_net,
1608};
1609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610static int __init init_ipv4_mibs(void)
1611{
Pavel Emelyanovd89cbbb2008-07-18 04:04:51 -07001612 return register_pernet_subsys(&ipv4_mib_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613}
1614
1615static int ipv4_proc_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616
Herbert Xu30e224d2005-07-05 14:40:10 -07001617/*
1618 * IP protocol layer initialiser
1619 */
1620
Stephen Hemminger7546dd92009-03-09 08:18:29 +00001621static struct packet_type ip_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -08001622 .type = cpu_to_be16(ETH_P_IP),
Herbert Xu30e224d2005-07-05 14:40:10 -07001623 .func = ip_rcv,
Herbert Xua430a432006-07-08 13:34:56 -07001624 .gso_send_check = inet_gso_send_check,
Herbert Xuf4c50d92006-06-22 03:02:40 -07001625 .gso_segment = inet_gso_segment,
Herbert Xu73cc19f2008-12-15 23:41:09 -08001626 .gro_receive = inet_gro_receive,
1627 .gro_complete = inet_gro_complete,
Herbert Xu30e224d2005-07-05 14:40:10 -07001628};
1629
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630static int __init inet_init(void)
1631{
1632 struct sk_buff *dummy_skb;
1633 struct inet_protosw *q;
1634 struct list_head *r;
1635 int rc = -EINVAL;
1636
YOSHIFUJI Hideakief047f52006-09-01 00:29:06 -07001637 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638
Amerigo Wange3826f12010-05-05 00:27:06 +00001639 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1640 if (!sysctl_local_reserved_ports)
1641 goto out;
1642
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 rc = proto_register(&tcp_prot, 1);
1644 if (rc)
Amerigo Wange3826f12010-05-05 00:27:06 +00001645 goto out_free_reserved_ports;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646
1647 rc = proto_register(&udp_prot, 1);
1648 if (rc)
1649 goto out_unregister_tcp_proto;
1650
1651 rc = proto_register(&raw_prot, 1);
1652 if (rc)
1653 goto out_unregister_udp_proto;
1654
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001655 rc = proto_register(&ping_prot, 1);
1656 if (rc)
1657 goto out_unregister_raw_proto;
1658
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001660 * Tell SOCKET that we are alive...
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661 */
1662
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001663 (void)sock_register(&inet_family_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664
Al Virobd7b1532008-07-15 16:00:59 -04001665#ifdef CONFIG_SYSCTL
1666 ip_static_sysctl_init();
1667#endif
1668
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 /*
1670 * Add all the base protocols.
1671 */
1672
1673 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1674 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1675 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1676 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1677 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1678 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1679#ifdef CONFIG_IP_MULTICAST
1680 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1681 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1682#endif
1683
1684 /* Register the socket-side information for inet_create. */
1685 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1686 INIT_LIST_HEAD(r);
1687
1688 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1689 inet_register_protosw(q);
1690
1691 /*
1692 * Set the ARP module up
1693 */
1694
1695 arp_init();
1696
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001697 /*
1698 * Set the IP module up
1699 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700
1701 ip_init();
1702
Denis V. Lunev9b0f9762008-02-29 11:13:15 -08001703 tcp_v4_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704
1705 /* Setup TCP slab cache for open requests. */
1706 tcp_init();
1707
Hideo Aoki95766ff2007-12-31 00:29:24 -08001708 /* Setup UDP memory threshold */
1709 udp_init();
1710
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001711 /* Add UDP-Lite (RFC 3828) */
1712 udplite4_register();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001714 ping_init();
1715
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 /*
1717 * Set the ICMP layer up
1718 */
1719
Denis V. Luneva5710d62008-02-29 11:14:50 -08001720 if (icmp_init() < 0)
1721 panic("Failed to create the ICMP control socket.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722
1723 /*
1724 * Initialise the multicast router
1725 */
1726#if defined(CONFIG_IP_MROUTE)
Wang Chen03d2f892008-07-03 12:13:36 +08001727 if (ip_mr_init())
1728 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729#endif
1730 /*
1731 * Initialise per-cpu ipv4 mibs
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001732 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733
Stephen Hemminger132adf52007-03-08 20:44:43 -08001734 if (init_ipv4_mibs())
Wang Chen03d2f892008-07-03 12:13:36 +08001735 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n");
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001736
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 ipv4_proc_init();
1738
1739 ipfrag_init();
1740
Herbert Xu30e224d2005-07-05 14:40:10 -07001741 dev_add_pack(&ip_packet_type);
1742
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743 rc = 0;
1744out:
1745 return rc;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001746out_unregister_raw_proto:
1747 proto_unregister(&raw_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748out_unregister_udp_proto:
1749 proto_unregister(&udp_prot);
Olaf Kirch321efff2006-09-27 16:33:45 -07001750out_unregister_tcp_proto:
1751 proto_unregister(&tcp_prot);
Amerigo Wange3826f12010-05-05 00:27:06 +00001752out_free_reserved_ports:
1753 kfree(sysctl_local_reserved_ports);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 goto out;
1755}
1756
Heiko Carstensa536e072006-04-28 15:19:17 -07001757fs_initcall(inet_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758
1759/* ------------------------------------------------------------------------ */
1760
1761#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762static int __init ipv4_proc_init(void)
1763{
1764 int rc = 0;
1765
1766 if (raw_proc_init())
1767 goto out_raw;
1768 if (tcp4_proc_init())
1769 goto out_tcp;
1770 if (udp4_proc_init())
1771 goto out_udp;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001772 if (ping_proc_init())
1773 goto out_ping;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774 if (ip_misc_proc_init())
1775 goto out_misc;
1776out:
1777 return rc;
1778out_misc:
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001779 ping_proc_exit();
1780out_ping:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 udp4_proc_exit();
1782out_udp:
1783 tcp4_proc_exit();
1784out_tcp:
1785 raw_proc_exit();
1786out_raw:
1787 rc = -ENOMEM;
1788 goto out;
1789}
1790
1791#else /* CONFIG_PROC_FS */
1792static int __init ipv4_proc_init(void)
1793{
1794 return 0;
1795}
1796#endif /* CONFIG_PROC_FS */
1797
1798MODULE_ALIAS_NETPROTO(PF_INET);
1799