blob: e588a34e85c261e92c8d26694011cfd8f99e5a04 [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;
Jiri Benc4c507d22012-02-09 09:35:49 +0000384 inet->rcv_tos = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700386 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000388 if (inet->inet_num) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 /* It assumes that any protocol which allows
390 * the user to assign a number at socket
391 * creation time automatically
392 * shares.
393 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000394 inet->inet_sport = htons(inet->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 /* Add to protocol hash chains. */
396 sk->sk_prot->hash(sk);
397 }
398
399 if (sk->sk_prot->init) {
400 err = sk->sk_prot->init(sk);
401 if (err)
402 sk_common_release(sk);
403 }
404out:
405 return err;
406out_rcu_unlock:
407 rcu_read_unlock();
408 goto out;
409}
410
411
412/*
413 * The peer socket should always be NULL (or else). When we call this
414 * function we are destroying the object and from then on nobody
415 * should refer to it.
416 */
417int inet_release(struct socket *sock)
418{
419 struct sock *sk = sock->sk;
420
421 if (sk) {
422 long timeout;
423
David S. Millerc58dc012010-04-27 15:05:31 -0700424 sock_rps_reset_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 /* Applications forget to leave groups before exiting */
427 ip_mc_drop_socket(sk);
428
429 /* If linger is set, we don't return until the close
430 * is complete. Otherwise we return immediately. The
431 * actually closing is done the same either way.
432 *
433 * If the close is due to the process exiting, we never
434 * linger..
435 */
436 timeout = 0;
437 if (sock_flag(sk, SOCK_LINGER) &&
438 !(current->flags & PF_EXITING))
439 timeout = sk->sk_lingertime;
440 sock->sk = NULL;
441 sk->sk_prot->close(sk, timeout);
442 }
443 return 0;
444}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700445EXPORT_SYMBOL(inet_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
447/* It is off by default, see below. */
Brian Haleyab32ea52006-09-22 14:15:41 -0700448int sysctl_ip_nonlocal_bind __read_mostly;
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700449EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
451int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
452{
453 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
454 struct sock *sk = sock->sk;
455 struct inet_sock *inet = inet_sk(sk);
456 unsigned short snum;
457 int chk_addr_ret;
458 int err;
459
460 /* If the socket has its own bind function then use it. (RAW) */
461 if (sk->sk_prot->bind) {
462 err = sk->sk_prot->bind(sk, uaddr, addr_len);
463 goto out;
464 }
465 err = -EINVAL;
466 if (addr_len < sizeof(struct sockaddr_in))
467 goto out;
468
Marcus Meissnerc349a522011-07-04 01:30:29 +0000469 if (addr->sin_family != AF_INET) {
Eric Dumazet29c486d2011-08-30 18:57:00 -0400470 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
471 * only if s_addr is INADDR_ANY.
472 */
Marcus Meissnerc349a522011-07-04 01:30:29 +0000473 err = -EAFNOSUPPORT;
Eric Dumazet29c486d2011-08-30 18:57:00 -0400474 if (addr->sin_family != AF_UNSPEC ||
475 addr->sin_addr.s_addr != htonl(INADDR_ANY))
476 goto out;
Marcus Meissnerc349a522011-07-04 01:30:29 +0000477 }
Marcus Meissnerd0733d22011-06-01 21:05:22 -0700478
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900479 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 /* Not specified by any standard per-se, however it breaks too
482 * many applications when removed. It is unfortunate since
483 * allowing applications to make a non-local bind solves
484 * several problems with systems using dynamic addressing.
485 * (ie. your servers still start up even if your ISDN link
486 * is temporarily down)
487 */
488 err = -EADDRNOTAVAIL;
489 if (!sysctl_ip_nonlocal_bind &&
Tóth László Attilab9fb1502008-10-01 07:31:24 -0700490 !(inet->freebind || inet->transparent) &&
Al Viroe6f1ceb2008-03-17 22:44:53 -0700491 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 chk_addr_ret != RTN_LOCAL &&
493 chk_addr_ret != RTN_MULTICAST &&
494 chk_addr_ret != RTN_BROADCAST)
495 goto out;
496
497 snum = ntohs(addr->sin_port);
498 err = -EACCES;
499 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
500 goto out;
501
502 /* We keep a pair of addresses. rcv_saddr is the one
503 * used by hash lookups, and saddr is used for transmit.
504 *
505 * In the BSD API these are the same except where it
506 * would be illegal to use them (multicast/broadcast) in
507 * which case the sending device address is used.
508 */
509 lock_sock(sk);
510
511 /* Check these errors (active socket, double bind). */
512 err = -EINVAL;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000513 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 goto out_release_sock;
515
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000516 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000518 inet->inet_saddr = 0; /* Use device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520 /* Make sure we are allowed to bind here. */
521 if (sk->sk_prot->get_port(sk, snum)) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000522 inet->inet_saddr = inet->inet_rcv_saddr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 err = -EADDRINUSE;
524 goto out_release_sock;
525 }
526
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000527 if (inet->inet_rcv_saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
529 if (snum)
530 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000531 inet->inet_sport = htons(inet->inet_num);
532 inet->inet_daddr = 0;
533 inet->inet_dport = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 sk_dst_reset(sk);
535 err = 0;
536out_release_sock:
537 release_sock(sk);
538out:
539 return err;
540}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700541EXPORT_SYMBOL(inet_bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
544 int addr_len, int flags)
545{
546 struct sock *sk = sock->sk;
547
Changli Gao6503d962010-03-31 22:58:26 +0000548 if (addr_len < sizeof(uaddr->sa_family))
549 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 if (uaddr->sa_family == AF_UNSPEC)
551 return sk->sk_prot->disconnect(sk, flags);
552
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000553 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 return -EAGAIN;
555 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
556}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700557EXPORT_SYMBOL(inet_dgram_connect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
559static long inet_wait_for_connect(struct sock *sk, long timeo)
560{
561 DEFINE_WAIT(wait);
562
Eric Dumazetaa395142010-04-20 13:03:51 +0000563 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
565 /* Basic assumption: if someone sets sk->sk_err, he _must_
566 * change state of the socket from TCP_SYN_*.
567 * Connect() does not allow to get error notifications
568 * without closing the socket.
569 */
570 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
571 release_sock(sk);
572 timeo = schedule_timeout(timeo);
573 lock_sock(sk);
574 if (signal_pending(current) || !timeo)
575 break;
Eric Dumazetaa395142010-04-20 13:03:51 +0000576 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 }
Eric Dumazetaa395142010-04-20 13:03:51 +0000578 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 return timeo;
580}
581
582/*
583 * Connect to a remote host. There is regrettably still a little
584 * TCP 'magic' in here.
585 */
586int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
587 int addr_len, int flags)
588{
589 struct sock *sk = sock->sk;
590 int err;
591 long timeo;
592
Changli Gao6503d962010-03-31 22:58:26 +0000593 if (addr_len < sizeof(uaddr->sa_family))
594 return -EINVAL;
595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 lock_sock(sk);
597
598 if (uaddr->sa_family == AF_UNSPEC) {
599 err = sk->sk_prot->disconnect(sk, flags);
600 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
601 goto out;
602 }
603
604 switch (sock->state) {
605 default:
606 err = -EINVAL;
607 goto out;
608 case SS_CONNECTED:
609 err = -EISCONN;
610 goto out;
611 case SS_CONNECTING:
612 err = -EALREADY;
613 /* Fall out of switch with err, set for this state */
614 break;
615 case SS_UNCONNECTED:
616 err = -EISCONN;
617 if (sk->sk_state != TCP_CLOSE)
618 goto out;
619
620 err = sk->sk_prot->connect(sk, uaddr, addr_len);
621 if (err < 0)
622 goto out;
623
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900624 sock->state = SS_CONNECTING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
626 /* Just entered SS_CONNECTING state; the only
627 * difference is that return value in non-blocking
628 * case is EINPROGRESS, rather than EALREADY.
629 */
630 err = -EINPROGRESS;
631 break;
632 }
633
634 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
635
636 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
637 /* Error code is set above */
638 if (!timeo || !inet_wait_for_connect(sk, timeo))
639 goto out;
640
641 err = sock_intr_errno(timeo);
642 if (signal_pending(current))
643 goto out;
644 }
645
646 /* Connection was closed by RST, timeout, ICMP error
647 * or another process disconnected us.
648 */
649 if (sk->sk_state == TCP_CLOSE)
650 goto sock_error;
651
652 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
653 * and error was received after socket entered established state.
654 * Hence, it is handled normally after connect() return successfully.
655 */
656
657 sock->state = SS_CONNECTED;
658 err = 0;
659out:
660 release_sock(sk);
661 return err;
662
663sock_error:
664 err = sock_error(sk) ? : -ECONNABORTED;
665 sock->state = SS_UNCONNECTED;
666 if (sk->sk_prot->disconnect(sk, flags))
667 sock->state = SS_DISCONNECTING;
668 goto out;
669}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700670EXPORT_SYMBOL(inet_stream_connect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
672/*
673 * Accept a pending connection. The TCP layer now gives BSD semantics.
674 */
675
676int inet_accept(struct socket *sock, struct socket *newsock, int flags)
677{
678 struct sock *sk1 = sock->sk;
679 int err = -EINVAL;
680 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
681
682 if (!sk2)
683 goto do_err;
684
685 lock_sock(sk2);
686
Eric Dumazet1eddcea2011-06-17 03:45:15 +0000687 sock_rps_record_flow(sk2);
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700688 WARN_ON(!((1 << sk2->sk_state) &
689 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
691 sock_graft(sk2, newsock);
692
693 newsock->state = SS_CONNECTED;
694 err = 0;
695 release_sock(sk2);
696do_err:
697 return err;
698}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700699EXPORT_SYMBOL(inet_accept);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
701
702/*
703 * This does both peername and sockname.
704 */
705int inet_getname(struct socket *sock, struct sockaddr *uaddr,
706 int *uaddr_len, int peer)
707{
708 struct sock *sk = sock->sk;
709 struct inet_sock *inet = inet_sk(sk);
Cyrill Gorcunov38bfd8f2009-10-29 02:59:18 -0700710 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
712 sin->sin_family = AF_INET;
713 if (peer) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000714 if (!inet->inet_dport ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
716 peer == 1))
717 return -ENOTCONN;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000718 sin->sin_port = inet->inet_dport;
719 sin->sin_addr.s_addr = inet->inet_daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 } else {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000721 __be32 addr = inet->inet_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 if (!addr)
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000723 addr = inet->inet_saddr;
724 sin->sin_port = inet->inet_sport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 sin->sin_addr.s_addr = addr;
726 }
727 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
728 *uaddr_len = sizeof(*sin);
729 return 0;
730}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700731EXPORT_SYMBOL(inet_getname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
733int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
734 size_t size)
735{
736 struct sock *sk = sock->sk;
737
David S. Millerc58dc012010-04-27 15:05:31 -0700738 sock_rps_record_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700739
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 /* We may need to bind the socket. */
Changli Gao7ba42912010-07-10 20:41:55 +0000741 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
742 inet_autobind(sk))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 return -EAGAIN;
744
745 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
746}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700747EXPORT_SYMBOL(inet_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
Changli Gao7ba42912010-07-10 20:41:55 +0000749ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
750 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751{
752 struct sock *sk = sock->sk;
753
David S. Millerc58dc012010-04-27 15:05:31 -0700754 sock_rps_record_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700755
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 /* We may need to bind the socket. */
Changli Gao7ba42912010-07-10 20:41:55 +0000757 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
758 inet_autobind(sk))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 return -EAGAIN;
760
761 if (sk->sk_prot->sendpage)
762 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
763 return sock_no_sendpage(sock, page, offset, size, flags);
764}
Changli Gao7ba42912010-07-10 20:41:55 +0000765EXPORT_SYMBOL(inet_sendpage);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Tom Herbertfec5e652010-04-16 16:01:27 -0700767int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
768 size_t size, int flags)
769{
770 struct sock *sk = sock->sk;
771 int addr_len = 0;
772 int err;
773
David S. Millerc58dc012010-04-27 15:05:31 -0700774 sock_rps_record_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700775
776 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
777 flags & ~MSG_DONTWAIT, &addr_len);
778 if (err >= 0)
779 msg->msg_namelen = addr_len;
780 return err;
781}
782EXPORT_SYMBOL(inet_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
784int inet_shutdown(struct socket *sock, int how)
785{
786 struct sock *sk = sock->sk;
787 int err = 0;
788
789 /* This should really check to make sure
790 * the socket is a TCP socket. (WHY AC...)
791 */
792 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
793 1->2 bit 2 snds.
794 2->3 */
795 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
796 return -EINVAL;
797
798 lock_sock(sk);
799 if (sock->state == SS_CONNECTING) {
800 if ((1 << sk->sk_state) &
801 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
802 sock->state = SS_DISCONNECTING;
803 else
804 sock->state = SS_CONNECTED;
805 }
806
807 switch (sk->sk_state) {
808 case TCP_CLOSE:
809 err = -ENOTCONN;
810 /* Hack to wake up other listeners, who can poll for
811 POLLHUP, even on eg. unconnected UDP sockets -- RR */
812 default:
813 sk->sk_shutdown |= how;
814 if (sk->sk_prot->shutdown)
815 sk->sk_prot->shutdown(sk, how);
816 break;
817
818 /* Remaining two branches are temporary solution for missing
819 * close() in multithreaded environment. It is _not_ a good idea,
820 * but we have no choice until close() is repaired at VFS level.
821 */
822 case TCP_LISTEN:
823 if (!(how & RCV_SHUTDOWN))
824 break;
825 /* Fall through */
826 case TCP_SYN_SENT:
827 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
828 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
829 break;
830 }
831
832 /* Wake up anyone sleeping in poll. */
833 sk->sk_state_change(sk);
834 release_sock(sk);
835 return err;
836}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700837EXPORT_SYMBOL(inet_shutdown);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
839/*
840 * ioctl() calls you can issue on an INET socket. Most of these are
841 * device configuration and stuff and very rarely used. Some ioctls
842 * pass on to the socket itself.
843 *
844 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
845 * loads the devconfigure module does its configuring and unloads it.
846 * There's a good 20K of config code hanging around the kernel.
847 */
848
849int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
850{
851 struct sock *sk = sock->sk;
852 int err = 0;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900853 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
855 switch (cmd) {
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700856 case SIOCGSTAMP:
857 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
858 break;
859 case SIOCGSTAMPNS:
860 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
861 break;
862 case SIOCADDRT:
863 case SIOCDELRT:
864 case SIOCRTMSG:
865 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
866 break;
867 case SIOCDARP:
868 case SIOCGARP:
869 case SIOCSARP:
870 err = arp_ioctl(net, cmd, (void __user *)arg);
871 break;
872 case SIOCGIFADDR:
873 case SIOCSIFADDR:
874 case SIOCGIFBRDADDR:
875 case SIOCSIFBRDADDR:
876 case SIOCGIFNETMASK:
877 case SIOCSIFNETMASK:
878 case SIOCGIFDSTADDR:
879 case SIOCSIFDSTADDR:
880 case SIOCSIFPFLAGS:
881 case SIOCGIFPFLAGS:
882 case SIOCSIFFLAGS:
883 err = devinet_ioctl(net, cmd, (void __user *)arg);
884 break;
885 default:
886 if (sk->sk_prot->ioctl)
887 err = sk->sk_prot->ioctl(sk, cmd, arg);
888 else
889 err = -ENOIOCTLCMD;
890 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 }
892 return err;
893}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700894EXPORT_SYMBOL(inet_ioctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000896#ifdef CONFIG_COMPAT
Gerrit Renker686dc6b2011-10-15 09:26:56 +0000897static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000898{
899 struct sock *sk = sock->sk;
900 int err = -ENOIOCTLCMD;
901
902 if (sk->sk_prot->compat_ioctl)
903 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
904
905 return err;
906}
907#endif
908
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800909const struct proto_ops inet_stream_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800910 .family = PF_INET,
911 .owner = THIS_MODULE,
912 .release = inet_release,
913 .bind = inet_bind,
914 .connect = inet_stream_connect,
915 .socketpair = sock_no_socketpair,
916 .accept = inet_accept,
917 .getname = inet_getname,
918 .poll = tcp_poll,
919 .ioctl = inet_ioctl,
920 .listen = inet_listen,
921 .shutdown = inet_shutdown,
922 .setsockopt = sock_common_setsockopt,
923 .getsockopt = sock_common_getsockopt,
Changli Gao7ba42912010-07-10 20:41:55 +0000924 .sendmsg = inet_sendmsg,
Tom Herbertfec5e652010-04-16 16:01:27 -0700925 .recvmsg = inet_recvmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800926 .mmap = sock_no_mmap,
Changli Gao7ba42912010-07-10 20:41:55 +0000927 .sendpage = inet_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800928 .splice_read = tcp_splice_read,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800929#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800930 .compat_setsockopt = compat_sock_common_setsockopt,
931 .compat_getsockopt = compat_sock_common_getsockopt,
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000932 .compat_ioctl = inet_compat_ioctl,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800933#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934};
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700935EXPORT_SYMBOL(inet_stream_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800937const struct proto_ops inet_dgram_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800938 .family = PF_INET,
939 .owner = THIS_MODULE,
940 .release = inet_release,
941 .bind = inet_bind,
942 .connect = inet_dgram_connect,
943 .socketpair = sock_no_socketpair,
944 .accept = sock_no_accept,
945 .getname = inet_getname,
946 .poll = udp_poll,
947 .ioctl = inet_ioctl,
948 .listen = sock_no_listen,
949 .shutdown = inet_shutdown,
950 .setsockopt = sock_common_setsockopt,
951 .getsockopt = sock_common_getsockopt,
952 .sendmsg = inet_sendmsg,
Tom Herbertfec5e652010-04-16 16:01:27 -0700953 .recvmsg = inet_recvmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800954 .mmap = sock_no_mmap,
955 .sendpage = inet_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800956#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800957 .compat_setsockopt = compat_sock_common_setsockopt,
958 .compat_getsockopt = compat_sock_common_getsockopt,
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000959 .compat_ioctl = inet_compat_ioctl,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800960#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961};
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700962EXPORT_SYMBOL(inet_dgram_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963
964/*
965 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
966 * udp_poll
967 */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800968static const struct proto_ops inet_sockraw_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800969 .family = PF_INET,
970 .owner = THIS_MODULE,
971 .release = inet_release,
972 .bind = inet_bind,
973 .connect = inet_dgram_connect,
974 .socketpair = sock_no_socketpair,
975 .accept = sock_no_accept,
976 .getname = inet_getname,
977 .poll = datagram_poll,
978 .ioctl = inet_ioctl,
979 .listen = sock_no_listen,
980 .shutdown = inet_shutdown,
981 .setsockopt = sock_common_setsockopt,
982 .getsockopt = sock_common_getsockopt,
983 .sendmsg = inet_sendmsg,
Tom Herbertfec5e652010-04-16 16:01:27 -0700984 .recvmsg = inet_recvmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800985 .mmap = sock_no_mmap,
986 .sendpage = inet_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800987#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800988 .compat_setsockopt = compat_sock_common_setsockopt,
989 .compat_getsockopt = compat_sock_common_getsockopt,
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000990 .compat_ioctl = inet_compat_ioctl,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800991#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992};
993
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +0000994static const struct net_proto_family inet_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 .family = PF_INET,
996 .create = inet_create,
997 .owner = THIS_MODULE,
998};
999
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000/* Upon startup we insert all the elements in inetsw_array[] into
1001 * the linked list inetsw.
1002 */
1003static struct inet_protosw inetsw_array[] =
1004{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001005 {
1006 .type = SOCK_STREAM,
1007 .protocol = IPPROTO_TCP,
1008 .prot = &tcp_prot,
1009 .ops = &inet_stream_ops,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001010 .no_check = 0,
1011 .flags = INET_PROTOSW_PERMANENT |
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001012 INET_PROTOSW_ICSK,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001013 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001015 {
1016 .type = SOCK_DGRAM,
1017 .protocol = IPPROTO_UDP,
1018 .prot = &udp_prot,
1019 .ops = &inet_dgram_ops,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001020 .no_check = UDP_CSUM_DEFAULT,
1021 .flags = INET_PROTOSW_PERMANENT,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 },
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001023
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001024 {
1025 .type = SOCK_DGRAM,
1026 .protocol = IPPROTO_ICMP,
1027 .prot = &ping_prot,
1028 .ops = &inet_dgram_ops,
1029 .no_check = UDP_CSUM_DEFAULT,
1030 .flags = INET_PROTOSW_REUSE,
1031 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032
1033 {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001034 .type = SOCK_RAW,
1035 .protocol = IPPROTO_IP, /* wild card */
1036 .prot = &raw_prot,
1037 .ops = &inet_sockraw_ops,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001038 .no_check = UDP_CSUM_DEFAULT,
1039 .flags = INET_PROTOSW_REUSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 }
1041};
1042
Denis Chengc40f6ff2007-09-16 16:39:25 -07001043#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
1045void inet_register_protosw(struct inet_protosw *p)
1046{
1047 struct list_head *lh;
1048 struct inet_protosw *answer;
1049 int protocol = p->protocol;
1050 struct list_head *last_perm;
1051
1052 spin_lock_bh(&inetsw_lock);
1053
1054 if (p->type >= SOCK_MAX)
1055 goto out_illegal;
1056
1057 /* If we are trying to override a permanent protocol, bail. */
1058 answer = NULL;
1059 last_perm = &inetsw[p->type];
1060 list_for_each(lh, &inetsw[p->type]) {
1061 answer = list_entry(lh, struct inet_protosw, list);
1062
1063 /* Check only the non-wild match. */
1064 if (INET_PROTOSW_PERMANENT & answer->flags) {
1065 if (protocol == answer->protocol)
1066 break;
1067 last_perm = lh;
1068 }
1069
1070 answer = NULL;
1071 }
1072 if (answer)
1073 goto out_permanent;
1074
1075 /* Add the new entry after the last permanent entry if any, so that
1076 * the new entry does not override a permanent entry when matched with
1077 * a wild-card protocol. But it is allowed to override any existing
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001078 * non-permanent entry. This means that when we remove this entry, the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 * system automatically returns to the old behavior.
1080 */
1081 list_add_rcu(&p->list, last_perm);
1082out:
1083 spin_unlock_bh(&inetsw_lock);
1084
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 return;
1086
1087out_permanent:
1088 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
1089 protocol);
1090 goto out;
1091
1092out_illegal:
1093 printk(KERN_ERR
1094 "Ignoring attempt to register invalid socket type %d.\n",
1095 p->type);
1096 goto out;
1097}
Eric Dumazet3d1427f2009-08-28 23:45:21 -07001098EXPORT_SYMBOL(inet_register_protosw);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099
1100void inet_unregister_protosw(struct inet_protosw *p)
1101{
1102 if (INET_PROTOSW_PERMANENT & p->flags) {
1103 printk(KERN_ERR
1104 "Attempt to unregister permanent protocol %d.\n",
1105 p->protocol);
1106 } else {
1107 spin_lock_bh(&inetsw_lock);
1108 list_del_rcu(&p->list);
1109 spin_unlock_bh(&inetsw_lock);
1110
1111 synchronize_net();
1112 }
1113}
Eric Dumazet3d1427f2009-08-28 23:45:21 -07001114EXPORT_SYMBOL(inet_unregister_protosw);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001116/*
1117 * Shall we try to damage output packets if routing dev changes?
1118 */
1119
Brian Haleyab32ea52006-09-22 14:15:41 -07001120int sysctl_ip_dynaddr __read_mostly;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001121
1122static int inet_sk_reselect_saddr(struct sock *sk)
1123{
1124 struct inet_sock *inet = inet_sk(sk);
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001125 __be32 old_saddr = inet->inet_saddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001126 __be32 daddr = inet->inet_daddr;
David S. Miller6e869132011-05-06 16:18:04 -07001127 struct flowi4 *fl4;
David S. Millerb23dd4f2011-03-02 14:31:35 -08001128 struct rtable *rt;
1129 __be32 new_saddr;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001130 struct ip_options_rcu *inet_opt;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001131
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001132 inet_opt = rcu_dereference_protected(inet->inet_opt,
1133 sock_owned_by_user(sk));
1134 if (inet_opt && inet_opt->opt.srr)
1135 daddr = inet_opt->opt.faddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001136
1137 /* Query new route. */
David S. Miller6e869132011-05-06 16:18:04 -07001138 fl4 = &inet->cork.fl.u.ip4;
1139 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
David S. Millerb23dd4f2011-03-02 14:31:35 -08001140 sk->sk_bound_dev_if, sk->sk_protocol,
1141 inet->inet_sport, inet->inet_dport, sk, false);
1142 if (IS_ERR(rt))
1143 return PTR_ERR(rt);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001144
Changli Gaod8d1f302010-06-10 23:31:35 -07001145 sk_setup_caps(sk, &rt->dst);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001146
David S. Miller6e869132011-05-06 16:18:04 -07001147 new_saddr = fl4->saddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001148
1149 if (new_saddr == old_saddr)
1150 return 0;
1151
1152 if (sysctl_ip_dynaddr > 1) {
Harvey Harrison673d57e2008-10-31 00:53:57 -07001153 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n",
1154 __func__, &old_saddr, &new_saddr);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001155 }
1156
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001157 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001158
1159 /*
1160 * XXX The only one ugly spot where we need to
1161 * XXX really change the sockets identity after
1162 * XXX it has entered the hashes. -DaveM
1163 *
1164 * Besides that, it does not check for connection
1165 * uniqueness. Wait for troubles.
1166 */
1167 __sk_prot_rehash(sk);
1168 return 0;
1169}
1170
1171int inet_sk_rebuild_header(struct sock *sk)
1172{
1173 struct inet_sock *inet = inet_sk(sk);
1174 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
Al Viro3ca3c682006-09-27 18:28:07 -07001175 __be32 daddr;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001176 struct ip_options_rcu *inet_opt;
David S. Miller6e869132011-05-06 16:18:04 -07001177 struct flowi4 *fl4;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001178 int err;
1179
1180 /* Route is OK, nothing to do. */
1181 if (rt)
1182 return 0;
1183
1184 /* Reroute. */
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001185 rcu_read_lock();
1186 inet_opt = rcu_dereference(inet->inet_opt);
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001187 daddr = inet->inet_daddr;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001188 if (inet_opt && inet_opt->opt.srr)
1189 daddr = inet_opt->opt.faddr;
1190 rcu_read_unlock();
David S. Miller6e869132011-05-06 16:18:04 -07001191 fl4 = &inet->cork.fl.u.ip4;
1192 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
David S. Miller78fbfd82011-03-12 00:00:52 -05001193 inet->inet_dport, inet->inet_sport,
1194 sk->sk_protocol, RT_CONN_FLAGS(sk),
1195 sk->sk_bound_dev_if);
David S. Millerb23dd4f2011-03-02 14:31:35 -08001196 if (!IS_ERR(rt)) {
1197 err = 0;
Changli Gaod8d1f302010-06-10 23:31:35 -07001198 sk_setup_caps(sk, &rt->dst);
David S. Millerb23dd4f2011-03-02 14:31:35 -08001199 } else {
1200 err = PTR_ERR(rt);
1201
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001202 /* Routing failed... */
1203 sk->sk_route_caps = 0;
1204 /*
1205 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1206 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1207 */
1208 if (!sysctl_ip_dynaddr ||
1209 sk->sk_state != TCP_SYN_SENT ||
1210 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1211 (err = inet_sk_reselect_saddr(sk)) != 0)
1212 sk->sk_err_soft = -err;
1213 }
1214
1215 return err;
1216}
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001217EXPORT_SYMBOL(inet_sk_rebuild_header);
1218
Herbert Xua430a432006-07-08 13:34:56 -07001219static int inet_gso_send_check(struct sk_buff *skb)
1220{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001221 const struct iphdr *iph;
Alexey Dobriyan32613092009-09-14 12:21:47 +00001222 const struct net_protocol *ops;
Herbert Xua430a432006-07-08 13:34:56 -07001223 int proto;
1224 int ihl;
1225 int err = -EINVAL;
1226
1227 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1228 goto out;
1229
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001230 iph = ip_hdr(skb);
Herbert Xua430a432006-07-08 13:34:56 -07001231 ihl = iph->ihl * 4;
1232 if (ihl < sizeof(*iph))
1233 goto out;
1234
1235 if (unlikely(!pskb_may_pull(skb, ihl)))
1236 goto out;
1237
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001238 __skb_pull(skb, ihl);
1239 skb_reset_transport_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001240 iph = ip_hdr(skb);
Herbert Xua430a432006-07-08 13:34:56 -07001241 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1242 err = -EPROTONOSUPPORT;
1243
1244 rcu_read_lock();
1245 ops = rcu_dereference(inet_protos[proto]);
1246 if (likely(ops && ops->gso_send_check))
1247 err = ops->gso_send_check(skb);
1248 rcu_read_unlock();
1249
1250out:
1251 return err;
1252}
1253
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001254static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1255 netdev_features_t features)
Herbert Xuf4c50d92006-06-22 03:02:40 -07001256{
1257 struct sk_buff *segs = ERR_PTR(-EINVAL);
1258 struct iphdr *iph;
Alexey Dobriyan32613092009-09-14 12:21:47 +00001259 const struct net_protocol *ops;
Herbert Xuf4c50d92006-06-22 03:02:40 -07001260 int proto;
1261 int ihl;
1262 int id;
Sridhar Samudralad7ca4cc2009-07-09 08:09:47 +00001263 unsigned int offset = 0;
Herbert Xuf4c50d92006-06-22 03:02:40 -07001264
Stephen Hemmingerd212f872007-06-27 00:47:37 -07001265 if (!(features & NETIF_F_V4_CSUM))
1266 features &= ~NETIF_F_SG;
1267
Herbert Xubbcf4672006-07-03 19:38:35 -07001268 if (unlikely(skb_shinfo(skb)->gso_type &
1269 ~(SKB_GSO_TCPV4 |
1270 SKB_GSO_UDP |
1271 SKB_GSO_DODGY |
1272 SKB_GSO_TCP_ECN |
1273 0)))
1274 goto out;
1275
1276 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001277 goto out;
1278
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001279 iph = ip_hdr(skb);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001280 ihl = iph->ihl * 4;
1281 if (ihl < sizeof(*iph))
1282 goto out;
1283
Herbert Xubbcf4672006-07-03 19:38:35 -07001284 if (unlikely(!pskb_may_pull(skb, ihl)))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001285 goto out;
1286
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001287 __skb_pull(skb, ihl);
1288 skb_reset_transport_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001289 iph = ip_hdr(skb);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001290 id = ntohs(iph->id);
1291 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1292 segs = ERR_PTR(-EPROTONOSUPPORT);
1293
1294 rcu_read_lock();
1295 ops = rcu_dereference(inet_protos[proto]);
Herbert Xubbcf4672006-07-03 19:38:35 -07001296 if (likely(ops && ops->gso_segment))
Herbert Xu576a30e2006-06-27 13:22:38 -07001297 segs = ops->gso_segment(skb, features);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001298 rcu_read_unlock();
1299
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001300 if (!segs || IS_ERR(segs))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001301 goto out;
1302
1303 skb = segs;
1304 do {
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001305 iph = ip_hdr(skb);
Sridhar Samudralad7ca4cc2009-07-09 08:09:47 +00001306 if (proto == IPPROTO_UDP) {
1307 iph->id = htons(id);
1308 iph->frag_off = htons(offset >> 3);
1309 if (skb->next != NULL)
1310 iph->frag_off |= htons(IP_MF);
1311 offset += (skb->len - skb->mac_len - iph->ihl * 4);
1312 } else
1313 iph->id = htons(id++);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001314 iph->tot_len = htons(skb->len - skb->mac_len);
1315 iph->check = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001316 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001317 } while ((skb = skb->next));
1318
1319out:
1320 return segs;
1321}
1322
Herbert Xu73cc19f2008-12-15 23:41:09 -08001323static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1324 struct sk_buff *skb)
1325{
Alexey Dobriyan32613092009-09-14 12:21:47 +00001326 const struct net_protocol *ops;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001327 struct sk_buff **pp = NULL;
1328 struct sk_buff *p;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001329 const struct iphdr *iph;
Herbert Xua5b1cf22009-05-26 18:50:28 +00001330 unsigned int hlen;
1331 unsigned int off;
Herbert Xu1075f3f2009-05-26 18:50:29 +00001332 unsigned int id;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001333 int flush = 1;
1334 int proto;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001335
Herbert Xua5b1cf22009-05-26 18:50:28 +00001336 off = skb_gro_offset(skb);
1337 hlen = off + sizeof(*iph);
1338 iph = skb_gro_header_fast(skb, off);
1339 if (skb_gro_header_hard(skb, hlen)) {
1340 iph = skb_gro_header_slow(skb, hlen, off);
1341 if (unlikely(!iph))
1342 goto out;
1343 }
Herbert Xu73cc19f2008-12-15 23:41:09 -08001344
Herbert Xu73cc19f2008-12-15 23:41:09 -08001345 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1346
1347 rcu_read_lock();
1348 ops = rcu_dereference(inet_protos[proto]);
1349 if (!ops || !ops->gro_receive)
1350 goto out_unlock;
1351
Herbert Xua5ad24b2009-02-08 18:00:39 +00001352 if (*(u8 *)iph != 0x45)
Herbert Xu73cc19f2008-12-15 23:41:09 -08001353 goto out_unlock;
1354
1355 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1356 goto out_unlock;
1357
Eric Dumazet0eae88f2010-04-20 19:06:52 -07001358 id = ntohl(*(__be32 *)&iph->id);
1359 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
Herbert Xu1075f3f2009-05-26 18:50:29 +00001360 id >>= 16;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001361
1362 for (p = *head; p; p = p->next) {
1363 struct iphdr *iph2;
1364
1365 if (!NAPI_GRO_CB(p)->same_flow)
1366 continue;
1367
1368 iph2 = ip_hdr(p);
1369
Herbert Xua5ad24b2009-02-08 18:00:39 +00001370 if ((iph->protocol ^ iph2->protocol) |
1371 (iph->tos ^ iph2->tos) |
Eric Dumazet0eae88f2010-04-20 19:06:52 -07001372 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1373 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
Herbert Xu73cc19f2008-12-15 23:41:09 -08001374 NAPI_GRO_CB(p)->same_flow = 0;
1375 continue;
1376 }
1377
1378 /* All fields must match except length and checksum. */
1379 NAPI_GRO_CB(p)->flush |=
Herbert Xua5ad24b2009-02-08 18:00:39 +00001380 (iph->ttl ^ iph2->ttl) |
1381 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
Herbert Xu73cc19f2008-12-15 23:41:09 -08001382
1383 NAPI_GRO_CB(p)->flush |= flush;
1384 }
1385
1386 NAPI_GRO_CB(skb)->flush |= flush;
Herbert Xu86911732009-01-29 14:19:50 +00001387 skb_gro_pull(skb, sizeof(*iph));
1388 skb_set_transport_header(skb, skb_gro_offset(skb));
Herbert Xu73cc19f2008-12-15 23:41:09 -08001389
1390 pp = ops->gro_receive(head, skb);
1391
1392out_unlock:
1393 rcu_read_unlock();
1394
1395out:
1396 NAPI_GRO_CB(skb)->flush |= flush;
1397
1398 return pp;
1399}
1400
1401static int inet_gro_complete(struct sk_buff *skb)
1402{
Alexey Dobriyan32613092009-09-14 12:21:47 +00001403 const struct net_protocol *ops;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001404 struct iphdr *iph = ip_hdr(skb);
1405 int proto = iph->protocol & (MAX_INET_PROTOS - 1);
1406 int err = -ENOSYS;
1407 __be16 newlen = htons(skb->len - skb_network_offset(skb));
1408
1409 csum_replace2(&iph->check, iph->tot_len, newlen);
1410 iph->tot_len = newlen;
1411
1412 rcu_read_lock();
1413 ops = rcu_dereference(inet_protos[proto]);
1414 if (WARN_ON(!ops || !ops->gro_complete))
1415 goto out_unlock;
1416
1417 err = ops->gro_complete(skb);
1418
1419out_unlock:
1420 rcu_read_unlock();
1421
1422 return err;
1423}
1424
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001425int inet_ctl_sock_create(struct sock **sk, unsigned short family,
Denis V. Lunev56772422008-04-03 14:28:30 -07001426 unsigned short type, unsigned char protocol,
1427 struct net *net)
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001428{
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001429 struct socket *sock;
1430 int rc = sock_create_kern(family, type, protocol, &sock);
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001431
1432 if (rc == 0) {
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001433 *sk = sock->sk;
1434 (*sk)->sk_allocation = GFP_ATOMIC;
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001435 /*
1436 * Unhash it so that IP input processing does not even see it,
1437 * we do not wish this socket to see incoming packets.
1438 */
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001439 (*sk)->sk_prot->unhash(*sk);
Denis V. Lunev56772422008-04-03 14:28:30 -07001440
1441 sk_change_net(*sk, net);
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001442 }
1443 return rc;
1444}
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001445EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1446
Tejun Heo7d720c32010-02-16 15:20:26 +00001447unsigned long snmp_fold_field(void __percpu *mib[], int offt)
Herbert Xu5e0f0432007-04-24 21:53:35 -07001448{
1449 unsigned long res = 0;
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001450 int i, j;
Herbert Xu5e0f0432007-04-24 21:53:35 -07001451
1452 for_each_possible_cpu(i) {
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001453 for (j = 0; j < SNMP_ARRAY_SZ; j++)
1454 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt);
Herbert Xu5e0f0432007-04-24 21:53:35 -07001455 }
1456 return res;
1457}
1458EXPORT_SYMBOL_GPL(snmp_fold_field);
1459
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001460#if BITS_PER_LONG==32
1461
1462u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset)
1463{
1464 u64 res = 0;
1465 int cpu;
1466
1467 for_each_possible_cpu(cpu) {
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001468 void *bhptr;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001469 struct u64_stats_sync *syncp;
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001470 u64 v;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001471 unsigned int start;
1472
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001473 bhptr = per_cpu_ptr(mib[0], cpu);
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001474 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1475 do {
1476 start = u64_stats_fetch_begin_bh(syncp);
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001477 v = *(((u64 *) bhptr) + offt);
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001478 } while (u64_stats_fetch_retry_bh(syncp, start));
1479
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001480 res += v;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001481 }
1482 return res;
1483}
1484EXPORT_SYMBOL_GPL(snmp_fold_field64);
1485#endif
1486
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001487int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align)
Herbert Xu5e0f0432007-04-24 21:53:35 -07001488{
1489 BUG_ON(ptr == NULL);
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001490 ptr[0] = __alloc_percpu(mibsize, align);
Herbert Xu5e0f0432007-04-24 21:53:35 -07001491 if (!ptr[0])
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001492 return -ENOMEM;
1493#if SNMP_ARRAY_SZ == 2
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001494 ptr[1] = __alloc_percpu(mibsize, align);
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001495 if (!ptr[1]) {
1496 free_percpu(ptr[0]);
1497 ptr[0] = NULL;
1498 return -ENOMEM;
1499 }
1500#endif
Herbert Xu5e0f0432007-04-24 21:53:35 -07001501 return 0;
Herbert Xu5e0f0432007-04-24 21:53:35 -07001502}
1503EXPORT_SYMBOL_GPL(snmp_mib_init);
1504
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001505void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ])
Herbert Xu5e0f0432007-04-24 21:53:35 -07001506{
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001507 int i;
1508
Herbert Xu5e0f0432007-04-24 21:53:35 -07001509 BUG_ON(ptr == NULL);
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001510 for (i = 0; i < SNMP_ARRAY_SZ; i++) {
1511 free_percpu(ptr[i]);
1512 ptr[i] = NULL;
1513 }
Herbert Xu5e0f0432007-04-24 21:53:35 -07001514}
1515EXPORT_SYMBOL_GPL(snmp_mib_free);
1516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517#ifdef CONFIG_IP_MULTICAST
Alexey Dobriyan32613092009-09-14 12:21:47 +00001518static const struct net_protocol igmp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 .handler = igmp_rcv,
Alexey Dobriyanb4ee07d2008-12-25 16:42:23 -08001520 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521};
1522#endif
1523
Alexey Dobriyan32613092009-09-14 12:21:47 +00001524static const struct net_protocol tcp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 .handler = tcp_v4_rcv,
1526 .err_handler = tcp_v4_err,
Herbert Xua430a432006-07-08 13:34:56 -07001527 .gso_send_check = tcp_v4_gso_send_check,
Herbert Xuf4c50d92006-06-22 03:02:40 -07001528 .gso_segment = tcp_tso_segment,
Herbert Xubf296b12008-12-15 23:43:36 -08001529 .gro_receive = tcp4_gro_receive,
1530 .gro_complete = tcp4_gro_complete,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001532 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533};
1534
Alexey Dobriyan32613092009-09-14 12:21:47 +00001535static const struct net_protocol udp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 .handler = udp_rcv,
1537 .err_handler = udp_err,
Sridhar Samudralad7ca4cc2009-07-09 08:09:47 +00001538 .gso_send_check = udp4_ufo_send_check,
1539 .gso_segment = udp4_ufo_fragment,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001541 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542};
1543
Alexey Dobriyan32613092009-09-14 12:21:47 +00001544static const struct net_protocol icmp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 .handler = icmp_rcv,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001546 .err_handler = ping_err,
Herbert Xu8b7817f2007-12-12 10:44:43 -08001547 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001548 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549};
1550
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001551static __net_init int ipv4_mib_init_net(struct net *net)
1552{
Tejun Heo7d720c32010-02-16 15:20:26 +00001553 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001554 sizeof(struct tcp_mib),
1555 __alignof__(struct tcp_mib)) < 0)
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001556 goto err_tcp_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001557 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001558 sizeof(struct ipstats_mib),
1559 __alignof__(struct ipstats_mib)) < 0)
Pavel Emelyanova20f5792008-07-18 04:02:42 -07001560 goto err_ip_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001561 if (snmp_mib_init((void __percpu **)net->mib.net_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001562 sizeof(struct linux_mib),
1563 __alignof__(struct linux_mib)) < 0)
Pavel Emelyanov61a7e262008-07-18 04:03:08 -07001564 goto err_net_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001565 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001566 sizeof(struct udp_mib),
1567 __alignof__(struct udp_mib)) < 0)
Pavel Emelyanov2f275f92008-07-18 04:03:27 -07001568 goto err_udp_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001569 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001570 sizeof(struct udp_mib),
1571 __alignof__(struct udp_mib)) < 0)
Pavel Emelyanov386019d2008-07-18 04:03:45 -07001572 goto err_udplite_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001573 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001574 sizeof(struct icmp_mib),
1575 __alignof__(struct icmp_mib)) < 0)
Pavel Emelyanovb60538a2008-07-18 04:04:02 -07001576 goto err_icmp_mib;
Eric Dumazetacb32ba2011-11-08 13:04:43 +00001577 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1578 GFP_KERNEL);
1579 if (!net->mib.icmpmsg_statistics)
Pavel Emelyanov923c6582008-07-18 04:04:22 -07001580 goto err_icmpmsg_mib;
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001581
1582 tcp_mib_init(net);
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001583 return 0;
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001584
Pavel Emelyanov923c6582008-07-18 04:04:22 -07001585err_icmpmsg_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001586 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
Pavel Emelyanovb60538a2008-07-18 04:04:02 -07001587err_icmp_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001588 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
Pavel Emelyanov386019d2008-07-18 04:03:45 -07001589err_udplite_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001590 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
Pavel Emelyanov2f275f92008-07-18 04:03:27 -07001591err_udp_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001592 snmp_mib_free((void __percpu **)net->mib.net_statistics);
Pavel Emelyanov61a7e262008-07-18 04:03:08 -07001593err_net_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001594 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
Pavel Emelyanova20f5792008-07-18 04:02:42 -07001595err_ip_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001596 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001597err_tcp_mib:
1598 return -ENOMEM;
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001599}
1600
1601static __net_exit void ipv4_mib_exit_net(struct net *net)
1602{
Eric Dumazetacb32ba2011-11-08 13:04:43 +00001603 kfree(net->mib.icmpmsg_statistics);
Tejun Heo7d720c32010-02-16 15:20:26 +00001604 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1605 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1606 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1607 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1608 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1609 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001610}
1611
1612static __net_initdata struct pernet_operations ipv4_mib_ops = {
1613 .init = ipv4_mib_init_net,
1614 .exit = ipv4_mib_exit_net,
1615};
1616
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617static int __init init_ipv4_mibs(void)
1618{
Pavel Emelyanovd89cbbb2008-07-18 04:04:51 -07001619 return register_pernet_subsys(&ipv4_mib_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620}
1621
1622static int ipv4_proc_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623
Herbert Xu30e224d2005-07-05 14:40:10 -07001624/*
1625 * IP protocol layer initialiser
1626 */
1627
Stephen Hemminger7546dd92009-03-09 08:18:29 +00001628static struct packet_type ip_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -08001629 .type = cpu_to_be16(ETH_P_IP),
Herbert Xu30e224d2005-07-05 14:40:10 -07001630 .func = ip_rcv,
Herbert Xua430a432006-07-08 13:34:56 -07001631 .gso_send_check = inet_gso_send_check,
Herbert Xuf4c50d92006-06-22 03:02:40 -07001632 .gso_segment = inet_gso_segment,
Herbert Xu73cc19f2008-12-15 23:41:09 -08001633 .gro_receive = inet_gro_receive,
1634 .gro_complete = inet_gro_complete,
Herbert Xu30e224d2005-07-05 14:40:10 -07001635};
1636
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637static int __init inet_init(void)
1638{
1639 struct sk_buff *dummy_skb;
1640 struct inet_protosw *q;
1641 struct list_head *r;
1642 int rc = -EINVAL;
1643
YOSHIFUJI Hideakief047f52006-09-01 00:29:06 -07001644 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645
Amerigo Wange3826f12010-05-05 00:27:06 +00001646 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1647 if (!sysctl_local_reserved_ports)
1648 goto out;
1649
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 rc = proto_register(&tcp_prot, 1);
1651 if (rc)
Amerigo Wange3826f12010-05-05 00:27:06 +00001652 goto out_free_reserved_ports;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653
1654 rc = proto_register(&udp_prot, 1);
1655 if (rc)
1656 goto out_unregister_tcp_proto;
1657
1658 rc = proto_register(&raw_prot, 1);
1659 if (rc)
1660 goto out_unregister_udp_proto;
1661
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001662 rc = proto_register(&ping_prot, 1);
1663 if (rc)
1664 goto out_unregister_raw_proto;
1665
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001667 * Tell SOCKET that we are alive...
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 */
1669
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001670 (void)sock_register(&inet_family_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671
Al Virobd7b1532008-07-15 16:00:59 -04001672#ifdef CONFIG_SYSCTL
1673 ip_static_sysctl_init();
1674#endif
1675
Glauber Costa3dc43e32011-12-11 21:47:05 +00001676 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
1677
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678 /*
1679 * Add all the base protocols.
1680 */
1681
1682 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1683 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1684 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1685 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1686 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1687 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1688#ifdef CONFIG_IP_MULTICAST
1689 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1690 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1691#endif
1692
1693 /* Register the socket-side information for inet_create. */
1694 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1695 INIT_LIST_HEAD(r);
1696
1697 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1698 inet_register_protosw(q);
1699
1700 /*
1701 * Set the ARP module up
1702 */
1703
1704 arp_init();
1705
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001706 /*
1707 * Set the IP module up
1708 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709
1710 ip_init();
1711
Denis V. Lunev9b0f9762008-02-29 11:13:15 -08001712 tcp_v4_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713
1714 /* Setup TCP slab cache for open requests. */
1715 tcp_init();
1716
Hideo Aoki95766ff2007-12-31 00:29:24 -08001717 /* Setup UDP memory threshold */
1718 udp_init();
1719
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001720 /* Add UDP-Lite (RFC 3828) */
1721 udplite4_register();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001723 ping_init();
1724
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 /*
1726 * Set the ICMP layer up
1727 */
1728
Denis V. Luneva5710d62008-02-29 11:14:50 -08001729 if (icmp_init() < 0)
1730 panic("Failed to create the ICMP control socket.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731
1732 /*
1733 * Initialise the multicast router
1734 */
1735#if defined(CONFIG_IP_MROUTE)
Wang Chen03d2f892008-07-03 12:13:36 +08001736 if (ip_mr_init())
1737 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738#endif
1739 /*
1740 * Initialise per-cpu ipv4 mibs
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001741 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742
Stephen Hemminger132adf52007-03-08 20:44:43 -08001743 if (init_ipv4_mibs())
Wang Chen03d2f892008-07-03 12:13:36 +08001744 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n");
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001745
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 ipv4_proc_init();
1747
1748 ipfrag_init();
1749
Herbert Xu30e224d2005-07-05 14:40:10 -07001750 dev_add_pack(&ip_packet_type);
1751
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 rc = 0;
1753out:
1754 return rc;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001755out_unregister_raw_proto:
1756 proto_unregister(&raw_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757out_unregister_udp_proto:
1758 proto_unregister(&udp_prot);
Olaf Kirch321efff2006-09-27 16:33:45 -07001759out_unregister_tcp_proto:
1760 proto_unregister(&tcp_prot);
Amerigo Wange3826f12010-05-05 00:27:06 +00001761out_free_reserved_ports:
1762 kfree(sysctl_local_reserved_ports);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763 goto out;
1764}
1765
Heiko Carstensa536e072006-04-28 15:19:17 -07001766fs_initcall(inet_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767
1768/* ------------------------------------------------------------------------ */
1769
1770#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771static int __init ipv4_proc_init(void)
1772{
1773 int rc = 0;
1774
1775 if (raw_proc_init())
1776 goto out_raw;
1777 if (tcp4_proc_init())
1778 goto out_tcp;
1779 if (udp4_proc_init())
1780 goto out_udp;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001781 if (ping_proc_init())
1782 goto out_ping;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 if (ip_misc_proc_init())
1784 goto out_misc;
1785out:
1786 return rc;
1787out_misc:
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001788 ping_proc_exit();
1789out_ping:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790 udp4_proc_exit();
1791out_udp:
1792 tcp4_proc_exit();
1793out_tcp:
1794 raw_proc_exit();
1795out_raw:
1796 rc = -ENOMEM;
1797 goto out;
1798}
1799
1800#else /* CONFIG_PROC_FS */
1801static int __init ipv4_proc_init(void)
1802{
1803 return 0;
1804}
1805#endif /* CONFIG_PROC_FS */
1806
1807MODULE_ALIAS_NETPROTO(PF_INET);
1808