blob: 566ea6c4321dc7023aae885693d34b70ae2fc324 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90#include <asm/uaccess.h>
91#include <asm/system.h>
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093#include <linux/inet.h>
94#include <linux/igmp.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020095#include <linux/inetdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070096#include <linux/netdevice.h>
Herbert Xu73cc19f2008-12-15 23:41:09 -080097#include <net/checksum.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#include <net/ip.h>
99#include <net/protocol.h>
100#include <net/arp.h>
101#include <net/route.h>
102#include <net/ip_fib.h>
Arnaldo Carvalho de Melo295f7322005-08-09 20:11:56 -0700103#include <net/inet_connection_sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104#include <net/tcp.h>
105#include <net/udp.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800106#include <net/udplite.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107#include <linux/skbuff.h>
108#include <net/sock.h>
109#include <net/raw.h>
110#include <net/icmp.h>
111#include <net/ipip.h>
112#include <net/inet_common.h>
113#include <net/xfrm.h>
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -0700114#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#ifdef CONFIG_IP_MROUTE
116#include <linux/mroute.h>
117#endif
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120/* The inetsw table contains everything that inet_create needs to
121 * build a new socket.
122 */
123static struct list_head inetsw[SOCK_MAX];
124static DEFINE_SPINLOCK(inetsw_lock);
125
Pavel Emelyanov9ba63972007-12-05 01:38:23 -0800126struct ipv4_config ipv4_config;
127
128EXPORT_SYMBOL(ipv4_config);
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130/* New destruction routine */
131
132void inet_sock_destruct(struct sock *sk)
133{
134 struct inet_sock *inet = inet_sk(sk);
135
136 __skb_queue_purge(&sk->sk_receive_queue);
137 __skb_queue_purge(&sk->sk_error_queue);
138
Hideo Aoki95766ff2007-12-31 00:29:24 -0800139 sk_mem_reclaim(sk);
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
142 printk("Attempt to release TCP socket in state %d %p\n",
143 sk->sk_state, sk);
144 return;
145 }
146 if (!sock_flag(sk, SOCK_DEAD)) {
147 printk("Attempt to release alive inet socket %p\n", sk);
148 return;
149 }
150
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700151 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
152 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
153 WARN_ON(sk->sk_wmem_queued);
154 WARN_ON(sk->sk_forward_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Jesper Juhla51482b2005-11-08 09:41:34 -0800156 kfree(inet->opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 dst_release(sk->sk_dst_cache);
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700158 sk_refcnt_debug_dec(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159}
160
161/*
162 * The routines beyond this point handle the behaviour of an AF_INET
163 * socket object. Mostly it punts to the subprotocols of IP to do
164 * the work.
165 */
166
167/*
168 * Automatically bind an unbound socket.
169 */
170
171static int inet_autobind(struct sock *sk)
172{
173 struct inet_sock *inet;
174 /* We may need to bind the socket. */
175 lock_sock(sk);
176 inet = inet_sk(sk);
177 if (!inet->num) {
178 if (sk->sk_prot->get_port(sk, 0)) {
179 release_sock(sk);
180 return -EAGAIN;
181 }
182 inet->sport = htons(inet->num);
183 }
184 release_sock(sk);
185 return 0;
186}
187
188/*
189 * Move a socket into listening state.
190 */
191int inet_listen(struct socket *sock, int backlog)
192{
193 struct sock *sk = sock->sk;
194 unsigned char old_state;
195 int err;
196
197 lock_sock(sk);
198
199 err = -EINVAL;
200 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
201 goto out;
202
203 old_state = sk->sk_state;
204 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
205 goto out;
206
207 /* Really, if the socket is already in listen state
208 * we can only allow the backlog to be adjusted.
209 */
210 if (old_state != TCP_LISTEN) {
Eric Dumazet72a3eff2006-11-16 02:30:37 -0800211 err = inet_csk_listen_start(sk, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 if (err)
213 goto out;
214 }
215 sk->sk_max_ack_backlog = backlog;
216 err = 0;
217
218out:
219 release_sock(sk);
220 return err;
221}
222
Eric Dumazetbe776282007-03-27 13:53:04 -0700223u32 inet_ehash_secret __read_mostly;
David S. Millerb3da2cf2007-03-23 11:40:27 -0700224EXPORT_SYMBOL(inet_ehash_secret);
225
Eric Dumazetbe776282007-03-27 13:53:04 -0700226/*
227 * inet_ehash_secret must be set exactly once
228 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock
229 */
David S. Millerb3da2cf2007-03-23 11:40:27 -0700230void build_ehash_secret(void)
231{
Eric Dumazetbe776282007-03-27 13:53:04 -0700232 u32 rnd;
233 do {
234 get_random_bytes(&rnd, sizeof(rnd));
235 } while (rnd == 0);
236 spin_lock_bh(&inetsw_lock);
237 if (!inet_ehash_secret)
238 inet_ehash_secret = rnd;
239 spin_unlock_bh(&inetsw_lock);
David S. Millerb3da2cf2007-03-23 11:40:27 -0700240}
241EXPORT_SYMBOL(build_ehash_secret);
242
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700243static inline int inet_netns_ok(struct net *net, int protocol)
244{
245 int hash;
246 struct net_protocol *ipprot;
247
Eric Dumazet04f258c2008-11-23 15:42:23 -0800248 if (net_eq(net, &init_net))
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700249 return 1;
250
251 hash = protocol & (MAX_INET_PROTOS - 1);
252 ipprot = rcu_dereference(inet_protos[hash]);
253
254 if (ipprot == NULL)
255 /* raw IP is OK */
256 return 1;
257 return ipprot->netns_ok;
258}
259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260/*
261 * Create an inet socket.
262 */
263
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700264static int inet_create(struct net *net, struct socket *sock, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265{
266 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 struct inet_protosw *answer;
268 struct inet_sock *inet;
269 struct proto *answer_prot;
270 unsigned char answer_flags;
271 char answer_no_check;
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700272 int try_loading_module = 0;
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800273 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Eric Dumazet04f258c2008-11-23 15:42:23 -0800275 if (unlikely(!inet_ehash_secret))
276 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
277 build_ehash_secret();
David S. Millerb3da2cf2007-03-23 11:40:27 -0700278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 sock->state = SS_UNCONNECTED;
280
281 /* Look for the requested type/protocol pair. */
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700282lookup_protocol:
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800283 err = -ESOCKTNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 rcu_read_lock();
Paul E. McKenney696adfe2008-07-25 01:45:34 -0700285 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Paul E. McKenney696adfe2008-07-25 01:45:34 -0700287 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 /* Check the non-wild match. */
289 if (protocol == answer->protocol) {
290 if (protocol != IPPROTO_IP)
291 break;
292 } else {
293 /* Check for the two wild cases. */
294 if (IPPROTO_IP == protocol) {
295 protocol = answer->protocol;
296 break;
297 }
298 if (IPPROTO_IP == answer->protocol)
299 break;
300 }
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800301 err = -EPROTONOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 }
303
Paul E. McKenney696adfe2008-07-25 01:45:34 -0700304 if (unlikely(err)) {
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700305 if (try_loading_module < 2) {
306 rcu_read_unlock();
307 /*
308 * Be more specific, e.g. net-pf-2-proto-132-type-1
309 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
310 */
311 if (++try_loading_module == 1)
312 request_module("net-pf-%d-proto-%d-type-%d",
313 PF_INET, protocol, sock->type);
314 /*
315 * Fall back to generic, e.g. net-pf-2-proto-132
316 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
317 */
318 else
319 request_module("net-pf-%d-proto-%d",
320 PF_INET, protocol);
321 goto lookup_protocol;
322 } else
323 goto out_rcu_unlock;
324 }
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 err = -EPERM;
327 if (answer->capability > 0 && !capable(answer->capability))
328 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700330 err = -EAFNOSUPPORT;
331 if (!inet_netns_ok(net, protocol))
332 goto out_rcu_unlock;
333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 sock->ops = answer->ops;
335 answer_prot = answer->prot;
336 answer_no_check = answer->no_check;
337 answer_flags = answer->flags;
338 rcu_read_unlock();
339
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700340 WARN_ON(answer_prot->slab == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342 err = -ENOBUFS;
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700343 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 if (sk == NULL)
345 goto out;
346
347 err = 0;
348 sk->sk_no_check = answer_no_check;
349 if (INET_PROTOSW_REUSE & answer_flags)
350 sk->sk_reuse = 1;
351
352 inet = inet_sk(sk);
Paul Moore469de9b2007-01-09 14:37:06 -0800353 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 if (SOCK_RAW == sock->type) {
356 inet->num = protocol;
357 if (IPPROTO_RAW == protocol)
358 inet->hdrincl = 1;
359 }
360
361 if (ipv4_config.no_pmtu_disc)
362 inet->pmtudisc = IP_PMTUDISC_DONT;
363 else
364 inet->pmtudisc = IP_PMTUDISC_WANT;
365
366 inet->id = 0;
367
368 sock_init_data(sock, sk);
369
370 sk->sk_destruct = inet_sock_destruct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 sk->sk_protocol = protocol;
372 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
373
374 inet->uc_ttl = -1;
375 inet->mc_loop = 1;
376 inet->mc_ttl = 1;
Nivedita Singhvif771bef2009-05-28 07:00:46 +0000377 inet->mc_all = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 inet->mc_index = 0;
379 inet->mc_list = NULL;
380
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700381 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
383 if (inet->num) {
384 /* It assumes that any protocol which allows
385 * the user to assign a number at socket
386 * creation time automatically
387 * shares.
388 */
389 inet->sport = htons(inet->num);
390 /* Add to protocol hash chains. */
391 sk->sk_prot->hash(sk);
392 }
393
394 if (sk->sk_prot->init) {
395 err = sk->sk_prot->init(sk);
396 if (err)
397 sk_common_release(sk);
398 }
399out:
400 return err;
401out_rcu_unlock:
402 rcu_read_unlock();
403 goto out;
404}
405
406
407/*
408 * The peer socket should always be NULL (or else). When we call this
409 * function we are destroying the object and from then on nobody
410 * should refer to it.
411 */
412int inet_release(struct socket *sock)
413{
414 struct sock *sk = sock->sk;
415
416 if (sk) {
417 long timeout;
418
419 /* Applications forget to leave groups before exiting */
420 ip_mc_drop_socket(sk);
421
422 /* If linger is set, we don't return until the close
423 * is complete. Otherwise we return immediately. The
424 * actually closing is done the same either way.
425 *
426 * If the close is due to the process exiting, we never
427 * linger..
428 */
429 timeout = 0;
430 if (sock_flag(sk, SOCK_LINGER) &&
431 !(current->flags & PF_EXITING))
432 timeout = sk->sk_lingertime;
433 sock->sk = NULL;
434 sk->sk_prot->close(sk, timeout);
435 }
436 return 0;
437}
438
439/* It is off by default, see below. */
Brian Haleyab32ea52006-09-22 14:15:41 -0700440int sysctl_ip_nonlocal_bind __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
442int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
443{
444 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
445 struct sock *sk = sock->sk;
446 struct inet_sock *inet = inet_sk(sk);
447 unsigned short snum;
448 int chk_addr_ret;
449 int err;
450
451 /* If the socket has its own bind function then use it. (RAW) */
452 if (sk->sk_prot->bind) {
453 err = sk->sk_prot->bind(sk, uaddr, addr_len);
454 goto out;
455 }
456 err = -EINVAL;
457 if (addr_len < sizeof(struct sockaddr_in))
458 goto out;
459
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900460 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462 /* Not specified by any standard per-se, however it breaks too
463 * many applications when removed. It is unfortunate since
464 * allowing applications to make a non-local bind solves
465 * several problems with systems using dynamic addressing.
466 * (ie. your servers still start up even if your ISDN link
467 * is temporarily down)
468 */
469 err = -EADDRNOTAVAIL;
470 if (!sysctl_ip_nonlocal_bind &&
Tóth László Attilab9fb1502008-10-01 07:31:24 -0700471 !(inet->freebind || inet->transparent) &&
Al Viroe6f1ceb2008-03-17 22:44:53 -0700472 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 chk_addr_ret != RTN_LOCAL &&
474 chk_addr_ret != RTN_MULTICAST &&
475 chk_addr_ret != RTN_BROADCAST)
476 goto out;
477
478 snum = ntohs(addr->sin_port);
479 err = -EACCES;
480 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
481 goto out;
482
483 /* We keep a pair of addresses. rcv_saddr is the one
484 * used by hash lookups, and saddr is used for transmit.
485 *
486 * In the BSD API these are the same except where it
487 * would be illegal to use them (multicast/broadcast) in
488 * which case the sending device address is used.
489 */
490 lock_sock(sk);
491
492 /* Check these errors (active socket, double bind). */
493 err = -EINVAL;
494 if (sk->sk_state != TCP_CLOSE || inet->num)
495 goto out_release_sock;
496
497 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
498 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
499 inet->saddr = 0; /* Use device */
500
501 /* Make sure we are allowed to bind here. */
502 if (sk->sk_prot->get_port(sk, snum)) {
503 inet->saddr = inet->rcv_saddr = 0;
504 err = -EADDRINUSE;
505 goto out_release_sock;
506 }
507
508 if (inet->rcv_saddr)
509 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
510 if (snum)
511 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
512 inet->sport = htons(inet->num);
513 inet->daddr = 0;
514 inet->dport = 0;
515 sk_dst_reset(sk);
516 err = 0;
517out_release_sock:
518 release_sock(sk);
519out:
520 return err;
521}
522
523int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
524 int addr_len, int flags)
525{
526 struct sock *sk = sock->sk;
527
528 if (uaddr->sa_family == AF_UNSPEC)
529 return sk->sk_prot->disconnect(sk, flags);
530
531 if (!inet_sk(sk)->num && inet_autobind(sk))
532 return -EAGAIN;
533 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
534}
535
536static long inet_wait_for_connect(struct sock *sk, long timeo)
537{
538 DEFINE_WAIT(wait);
539
540 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
541
542 /* Basic assumption: if someone sets sk->sk_err, he _must_
543 * change state of the socket from TCP_SYN_*.
544 * Connect() does not allow to get error notifications
545 * without closing the socket.
546 */
547 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
548 release_sock(sk);
549 timeo = schedule_timeout(timeo);
550 lock_sock(sk);
551 if (signal_pending(current) || !timeo)
552 break;
553 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
554 }
555 finish_wait(sk->sk_sleep, &wait);
556 return timeo;
557}
558
559/*
560 * Connect to a remote host. There is regrettably still a little
561 * TCP 'magic' in here.
562 */
563int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
564 int addr_len, int flags)
565{
566 struct sock *sk = sock->sk;
567 int err;
568 long timeo;
569
570 lock_sock(sk);
571
572 if (uaddr->sa_family == AF_UNSPEC) {
573 err = sk->sk_prot->disconnect(sk, flags);
574 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
575 goto out;
576 }
577
578 switch (sock->state) {
579 default:
580 err = -EINVAL;
581 goto out;
582 case SS_CONNECTED:
583 err = -EISCONN;
584 goto out;
585 case SS_CONNECTING:
586 err = -EALREADY;
587 /* Fall out of switch with err, set for this state */
588 break;
589 case SS_UNCONNECTED:
590 err = -EISCONN;
591 if (sk->sk_state != TCP_CLOSE)
592 goto out;
593
594 err = sk->sk_prot->connect(sk, uaddr, addr_len);
595 if (err < 0)
596 goto out;
597
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900598 sock->state = SS_CONNECTING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600 /* Just entered SS_CONNECTING state; the only
601 * difference is that return value in non-blocking
602 * case is EINPROGRESS, rather than EALREADY.
603 */
604 err = -EINPROGRESS;
605 break;
606 }
607
608 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
609
610 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
611 /* Error code is set above */
612 if (!timeo || !inet_wait_for_connect(sk, timeo))
613 goto out;
614
615 err = sock_intr_errno(timeo);
616 if (signal_pending(current))
617 goto out;
618 }
619
620 /* Connection was closed by RST, timeout, ICMP error
621 * or another process disconnected us.
622 */
623 if (sk->sk_state == TCP_CLOSE)
624 goto sock_error;
625
626 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
627 * and error was received after socket entered established state.
628 * Hence, it is handled normally after connect() return successfully.
629 */
630
631 sock->state = SS_CONNECTED;
632 err = 0;
633out:
634 release_sock(sk);
635 return err;
636
637sock_error:
638 err = sock_error(sk) ? : -ECONNABORTED;
639 sock->state = SS_UNCONNECTED;
640 if (sk->sk_prot->disconnect(sk, flags))
641 sock->state = SS_DISCONNECTING;
642 goto out;
643}
644
645/*
646 * Accept a pending connection. The TCP layer now gives BSD semantics.
647 */
648
649int inet_accept(struct socket *sock, struct socket *newsock, int flags)
650{
651 struct sock *sk1 = sock->sk;
652 int err = -EINVAL;
653 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
654
655 if (!sk2)
656 goto do_err;
657
658 lock_sock(sk2);
659
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700660 WARN_ON(!((1 << sk2->sk_state) &
661 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
663 sock_graft(sk2, newsock);
664
665 newsock->state = SS_CONNECTED;
666 err = 0;
667 release_sock(sk2);
668do_err:
669 return err;
670}
671
672
673/*
674 * This does both peername and sockname.
675 */
676int inet_getname(struct socket *sock, struct sockaddr *uaddr,
677 int *uaddr_len, int peer)
678{
679 struct sock *sk = sock->sk;
680 struct inet_sock *inet = inet_sk(sk);
681 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
682
683 sin->sin_family = AF_INET;
684 if (peer) {
685 if (!inet->dport ||
686 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
687 peer == 1))
688 return -ENOTCONN;
689 sin->sin_port = inet->dport;
690 sin->sin_addr.s_addr = inet->daddr;
691 } else {
Al Viro714e85b2006-11-14 20:51:49 -0800692 __be32 addr = inet->rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 if (!addr)
694 addr = inet->saddr;
695 sin->sin_port = inet->sport;
696 sin->sin_addr.s_addr = addr;
697 }
698 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
699 *uaddr_len = sizeof(*sin);
700 return 0;
701}
702
703int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
704 size_t size)
705{
706 struct sock *sk = sock->sk;
707
708 /* We may need to bind the socket. */
709 if (!inet_sk(sk)->num && inet_autobind(sk))
710 return -EAGAIN;
711
712 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
713}
714
715
716static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
717{
718 struct sock *sk = sock->sk;
719
720 /* We may need to bind the socket. */
721 if (!inet_sk(sk)->num && inet_autobind(sk))
722 return -EAGAIN;
723
724 if (sk->sk_prot->sendpage)
725 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
726 return sock_no_sendpage(sock, page, offset, size, flags);
727}
728
729
730int inet_shutdown(struct socket *sock, int how)
731{
732 struct sock *sk = sock->sk;
733 int err = 0;
734
735 /* This should really check to make sure
736 * the socket is a TCP socket. (WHY AC...)
737 */
738 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
739 1->2 bit 2 snds.
740 2->3 */
741 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
742 return -EINVAL;
743
744 lock_sock(sk);
745 if (sock->state == SS_CONNECTING) {
746 if ((1 << sk->sk_state) &
747 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
748 sock->state = SS_DISCONNECTING;
749 else
750 sock->state = SS_CONNECTED;
751 }
752
753 switch (sk->sk_state) {
754 case TCP_CLOSE:
755 err = -ENOTCONN;
756 /* Hack to wake up other listeners, who can poll for
757 POLLHUP, even on eg. unconnected UDP sockets -- RR */
758 default:
759 sk->sk_shutdown |= how;
760 if (sk->sk_prot->shutdown)
761 sk->sk_prot->shutdown(sk, how);
762 break;
763
764 /* Remaining two branches are temporary solution for missing
765 * close() in multithreaded environment. It is _not_ a good idea,
766 * but we have no choice until close() is repaired at VFS level.
767 */
768 case TCP_LISTEN:
769 if (!(how & RCV_SHUTDOWN))
770 break;
771 /* Fall through */
772 case TCP_SYN_SENT:
773 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
774 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
775 break;
776 }
777
778 /* Wake up anyone sleeping in poll. */
779 sk->sk_state_change(sk);
780 release_sock(sk);
781 return err;
782}
783
784/*
785 * ioctl() calls you can issue on an INET socket. Most of these are
786 * device configuration and stuff and very rarely used. Some ioctls
787 * pass on to the socket itself.
788 *
789 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
790 * loads the devconfigure module does its configuring and unloads it.
791 * There's a good 20K of config code hanging around the kernel.
792 */
793
794int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
795{
796 struct sock *sk = sock->sk;
797 int err = 0;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900798 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
800 switch (cmd) {
801 case SIOCGSTAMP:
802 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
803 break;
Eric Dumazetae40eb12007-03-18 17:33:16 -0700804 case SIOCGSTAMPNS:
805 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
806 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 case SIOCADDRT:
808 case SIOCDELRT:
809 case SIOCRTMSG:
Denis V. Luneve5b13cb2008-02-28 20:51:43 -0800810 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 break;
812 case SIOCDARP:
813 case SIOCGARP:
814 case SIOCSARP:
Denis V. Luneve5b13cb2008-02-28 20:51:43 -0800815 err = arp_ioctl(net, cmd, (void __user *)arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 break;
817 case SIOCGIFADDR:
818 case SIOCSIFADDR:
819 case SIOCGIFBRDADDR:
820 case SIOCSIFBRDADDR:
821 case SIOCGIFNETMASK:
822 case SIOCSIFNETMASK:
823 case SIOCGIFDSTADDR:
824 case SIOCSIFDSTADDR:
825 case SIOCSIFPFLAGS:
826 case SIOCGIFPFLAGS:
827 case SIOCSIFFLAGS:
Denis V. Luneve5b13cb2008-02-28 20:51:43 -0800828 err = devinet_ioctl(net, cmd, (void __user *)arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 break;
830 default:
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -0800831 if (sk->sk_prot->ioctl)
832 err = sk->sk_prot->ioctl(sk, cmd, arg);
833 else
834 err = -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 break;
836 }
837 return err;
838}
839
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800840const struct proto_ops inet_stream_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800841 .family = PF_INET,
842 .owner = THIS_MODULE,
843 .release = inet_release,
844 .bind = inet_bind,
845 .connect = inet_stream_connect,
846 .socketpair = sock_no_socketpair,
847 .accept = inet_accept,
848 .getname = inet_getname,
849 .poll = tcp_poll,
850 .ioctl = inet_ioctl,
851 .listen = inet_listen,
852 .shutdown = inet_shutdown,
853 .setsockopt = sock_common_setsockopt,
854 .getsockopt = sock_common_getsockopt,
David S. Miller3516ffb2007-08-02 19:23:56 -0700855 .sendmsg = tcp_sendmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800856 .recvmsg = sock_common_recvmsg,
857 .mmap = sock_no_mmap,
858 .sendpage = tcp_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800859 .splice_read = tcp_splice_read,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800860#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800861 .compat_setsockopt = compat_sock_common_setsockopt,
862 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800863#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864};
865
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800866const struct proto_ops inet_dgram_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800867 .family = PF_INET,
868 .owner = THIS_MODULE,
869 .release = inet_release,
870 .bind = inet_bind,
871 .connect = inet_dgram_connect,
872 .socketpair = sock_no_socketpair,
873 .accept = sock_no_accept,
874 .getname = inet_getname,
875 .poll = udp_poll,
876 .ioctl = inet_ioctl,
877 .listen = sock_no_listen,
878 .shutdown = inet_shutdown,
879 .setsockopt = sock_common_setsockopt,
880 .getsockopt = sock_common_getsockopt,
881 .sendmsg = inet_sendmsg,
882 .recvmsg = sock_common_recvmsg,
883 .mmap = sock_no_mmap,
884 .sendpage = inet_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800885#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800886 .compat_setsockopt = compat_sock_common_setsockopt,
887 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800888#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889};
890
891/*
892 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
893 * udp_poll
894 */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800895static const struct proto_ops inet_sockraw_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800896 .family = PF_INET,
897 .owner = THIS_MODULE,
898 .release = inet_release,
899 .bind = inet_bind,
900 .connect = inet_dgram_connect,
901 .socketpair = sock_no_socketpair,
902 .accept = sock_no_accept,
903 .getname = inet_getname,
904 .poll = datagram_poll,
905 .ioctl = inet_ioctl,
906 .listen = sock_no_listen,
907 .shutdown = inet_shutdown,
908 .setsockopt = sock_common_setsockopt,
909 .getsockopt = sock_common_getsockopt,
910 .sendmsg = inet_sendmsg,
911 .recvmsg = sock_common_recvmsg,
912 .mmap = sock_no_mmap,
913 .sendpage = inet_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800914#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800915 .compat_setsockopt = compat_sock_common_setsockopt,
916 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800917#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918};
919
920static struct net_proto_family inet_family_ops = {
921 .family = PF_INET,
922 .create = inet_create,
923 .owner = THIS_MODULE,
924};
925
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926/* Upon startup we insert all the elements in inetsw_array[] into
927 * the linked list inetsw.
928 */
929static struct inet_protosw inetsw_array[] =
930{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900931 {
932 .type = SOCK_STREAM,
933 .protocol = IPPROTO_TCP,
934 .prot = &tcp_prot,
935 .ops = &inet_stream_ops,
936 .capability = -1,
937 .no_check = 0,
938 .flags = INET_PROTOSW_PERMANENT |
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800939 INET_PROTOSW_ICSK,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900940 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900942 {
943 .type = SOCK_DGRAM,
944 .protocol = IPPROTO_UDP,
945 .prot = &udp_prot,
946 .ops = &inet_dgram_ops,
947 .capability = -1,
948 .no_check = UDP_CSUM_DEFAULT,
949 .flags = INET_PROTOSW_PERMANENT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 },
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900951
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
953 {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900954 .type = SOCK_RAW,
955 .protocol = IPPROTO_IP, /* wild card */
956 .prot = &raw_prot,
957 .ops = &inet_sockraw_ops,
958 .capability = CAP_NET_RAW,
959 .no_check = UDP_CSUM_DEFAULT,
960 .flags = INET_PROTOSW_REUSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 }
962};
963
Denis Chengc40f6ff2007-09-16 16:39:25 -0700964#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
966void inet_register_protosw(struct inet_protosw *p)
967{
968 struct list_head *lh;
969 struct inet_protosw *answer;
970 int protocol = p->protocol;
971 struct list_head *last_perm;
972
973 spin_lock_bh(&inetsw_lock);
974
975 if (p->type >= SOCK_MAX)
976 goto out_illegal;
977
978 /* If we are trying to override a permanent protocol, bail. */
979 answer = NULL;
980 last_perm = &inetsw[p->type];
981 list_for_each(lh, &inetsw[p->type]) {
982 answer = list_entry(lh, struct inet_protosw, list);
983
984 /* Check only the non-wild match. */
985 if (INET_PROTOSW_PERMANENT & answer->flags) {
986 if (protocol == answer->protocol)
987 break;
988 last_perm = lh;
989 }
990
991 answer = NULL;
992 }
993 if (answer)
994 goto out_permanent;
995
996 /* Add the new entry after the last permanent entry if any, so that
997 * the new entry does not override a permanent entry when matched with
998 * a wild-card protocol. But it is allowed to override any existing
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900999 * non-permanent entry. This means that when we remove this entry, the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 * system automatically returns to the old behavior.
1001 */
1002 list_add_rcu(&p->list, last_perm);
1003out:
1004 spin_unlock_bh(&inetsw_lock);
1005
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 return;
1007
1008out_permanent:
1009 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
1010 protocol);
1011 goto out;
1012
1013out_illegal:
1014 printk(KERN_ERR
1015 "Ignoring attempt to register invalid socket type %d.\n",
1016 p->type);
1017 goto out;
1018}
1019
1020void inet_unregister_protosw(struct inet_protosw *p)
1021{
1022 if (INET_PROTOSW_PERMANENT & p->flags) {
1023 printk(KERN_ERR
1024 "Attempt to unregister permanent protocol %d.\n",
1025 p->protocol);
1026 } else {
1027 spin_lock_bh(&inetsw_lock);
1028 list_del_rcu(&p->list);
1029 spin_unlock_bh(&inetsw_lock);
1030
1031 synchronize_net();
1032 }
1033}
1034
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001035/*
1036 * Shall we try to damage output packets if routing dev changes?
1037 */
1038
Brian Haleyab32ea52006-09-22 14:15:41 -07001039int sysctl_ip_dynaddr __read_mostly;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001040
1041static int inet_sk_reselect_saddr(struct sock *sk)
1042{
1043 struct inet_sock *inet = inet_sk(sk);
1044 int err;
1045 struct rtable *rt;
Al Viro714e85b2006-11-14 20:51:49 -08001046 __be32 old_saddr = inet->saddr;
1047 __be32 new_saddr;
Al Virobada8ad2006-09-26 21:27:15 -07001048 __be32 daddr = inet->daddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001049
1050 if (inet->opt && inet->opt->srr)
1051 daddr = inet->opt->faddr;
1052
1053 /* Query new route. */
1054 err = ip_route_connect(&rt, daddr, 0,
1055 RT_CONN_FLAGS(sk),
1056 sk->sk_bound_dev_if,
1057 sk->sk_protocol,
David S. Miller8eb90862007-02-08 02:09:21 -08001058 inet->sport, inet->dport, sk, 0);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001059 if (err)
1060 return err;
1061
1062 sk_setup_caps(sk, &rt->u.dst);
1063
1064 new_saddr = rt->rt_src;
1065
1066 if (new_saddr == old_saddr)
1067 return 0;
1068
1069 if (sysctl_ip_dynaddr > 1) {
Harvey Harrison673d57e2008-10-31 00:53:57 -07001070 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n",
1071 __func__, &old_saddr, &new_saddr);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001072 }
1073
1074 inet->saddr = inet->rcv_saddr = new_saddr;
1075
1076 /*
1077 * XXX The only one ugly spot where we need to
1078 * XXX really change the sockets identity after
1079 * XXX it has entered the hashes. -DaveM
1080 *
1081 * Besides that, it does not check for connection
1082 * uniqueness. Wait for troubles.
1083 */
1084 __sk_prot_rehash(sk);
1085 return 0;
1086}
1087
1088int inet_sk_rebuild_header(struct sock *sk)
1089{
1090 struct inet_sock *inet = inet_sk(sk);
1091 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
Al Viro3ca3c682006-09-27 18:28:07 -07001092 __be32 daddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001093 int err;
1094
1095 /* Route is OK, nothing to do. */
1096 if (rt)
1097 return 0;
1098
1099 /* Reroute. */
1100 daddr = inet->daddr;
1101 if (inet->opt && inet->opt->srr)
1102 daddr = inet->opt->faddr;
1103{
1104 struct flowi fl = {
1105 .oif = sk->sk_bound_dev_if,
1106 .nl_u = {
1107 .ip4_u = {
1108 .daddr = daddr,
1109 .saddr = inet->saddr,
1110 .tos = RT_CONN_FLAGS(sk),
1111 },
1112 },
1113 .proto = sk->sk_protocol,
Balazs Scheidlerc8283842008-11-20 01:08:06 -08001114 .flags = inet_sk_flowi_flags(sk),
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001115 .uli_u = {
1116 .ports = {
1117 .sport = inet->sport,
1118 .dport = inet->dport,
1119 },
1120 },
1121 };
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001122
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001123 security_sk_classify_flow(sk, &fl);
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001124 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001125}
1126 if (!err)
1127 sk_setup_caps(sk, &rt->u.dst);
1128 else {
1129 /* Routing failed... */
1130 sk->sk_route_caps = 0;
1131 /*
1132 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1133 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1134 */
1135 if (!sysctl_ip_dynaddr ||
1136 sk->sk_state != TCP_SYN_SENT ||
1137 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1138 (err = inet_sk_reselect_saddr(sk)) != 0)
1139 sk->sk_err_soft = -err;
1140 }
1141
1142 return err;
1143}
1144
1145EXPORT_SYMBOL(inet_sk_rebuild_header);
1146
Herbert Xua430a432006-07-08 13:34:56 -07001147static int inet_gso_send_check(struct sk_buff *skb)
1148{
1149 struct iphdr *iph;
1150 struct net_protocol *ops;
1151 int proto;
1152 int ihl;
1153 int err = -EINVAL;
1154
1155 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1156 goto out;
1157
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001158 iph = ip_hdr(skb);
Herbert Xua430a432006-07-08 13:34:56 -07001159 ihl = iph->ihl * 4;
1160 if (ihl < sizeof(*iph))
1161 goto out;
1162
1163 if (unlikely(!pskb_may_pull(skb, ihl)))
1164 goto out;
1165
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001166 __skb_pull(skb, ihl);
1167 skb_reset_transport_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001168 iph = ip_hdr(skb);
Herbert Xua430a432006-07-08 13:34:56 -07001169 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1170 err = -EPROTONOSUPPORT;
1171
1172 rcu_read_lock();
1173 ops = rcu_dereference(inet_protos[proto]);
1174 if (likely(ops && ops->gso_send_check))
1175 err = ops->gso_send_check(skb);
1176 rcu_read_unlock();
1177
1178out:
1179 return err;
1180}
1181
Herbert Xu576a30e2006-06-27 13:22:38 -07001182static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
Herbert Xuf4c50d92006-06-22 03:02:40 -07001183{
1184 struct sk_buff *segs = ERR_PTR(-EINVAL);
1185 struct iphdr *iph;
1186 struct net_protocol *ops;
1187 int proto;
1188 int ihl;
1189 int id;
1190
Stephen Hemmingerd212f872007-06-27 00:47:37 -07001191 if (!(features & NETIF_F_V4_CSUM))
1192 features &= ~NETIF_F_SG;
1193
Herbert Xubbcf4672006-07-03 19:38:35 -07001194 if (unlikely(skb_shinfo(skb)->gso_type &
1195 ~(SKB_GSO_TCPV4 |
1196 SKB_GSO_UDP |
1197 SKB_GSO_DODGY |
1198 SKB_GSO_TCP_ECN |
1199 0)))
1200 goto out;
1201
1202 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001203 goto out;
1204
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001205 iph = ip_hdr(skb);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001206 ihl = iph->ihl * 4;
1207 if (ihl < sizeof(*iph))
1208 goto out;
1209
Herbert Xubbcf4672006-07-03 19:38:35 -07001210 if (unlikely(!pskb_may_pull(skb, ihl)))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001211 goto out;
1212
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001213 __skb_pull(skb, ihl);
1214 skb_reset_transport_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001215 iph = ip_hdr(skb);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001216 id = ntohs(iph->id);
1217 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1218 segs = ERR_PTR(-EPROTONOSUPPORT);
1219
1220 rcu_read_lock();
1221 ops = rcu_dereference(inet_protos[proto]);
Herbert Xubbcf4672006-07-03 19:38:35 -07001222 if (likely(ops && ops->gso_segment))
Herbert Xu576a30e2006-06-27 13:22:38 -07001223 segs = ops->gso_segment(skb, features);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001224 rcu_read_unlock();
1225
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001226 if (!segs || IS_ERR(segs))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001227 goto out;
1228
1229 skb = segs;
1230 do {
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001231 iph = ip_hdr(skb);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001232 iph->id = htons(id++);
1233 iph->tot_len = htons(skb->len - skb->mac_len);
1234 iph->check = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001235 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001236 } while ((skb = skb->next));
1237
1238out:
1239 return segs;
1240}
1241
Herbert Xu73cc19f2008-12-15 23:41:09 -08001242static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1243 struct sk_buff *skb)
1244{
1245 struct net_protocol *ops;
1246 struct sk_buff **pp = NULL;
1247 struct sk_buff *p;
1248 struct iphdr *iph;
Herbert Xua5b1cf22009-05-26 18:50:28 +00001249 unsigned int hlen;
1250 unsigned int off;
Herbert Xu1075f3f2009-05-26 18:50:29 +00001251 unsigned int id;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001252 int flush = 1;
1253 int proto;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001254
Herbert Xua5b1cf22009-05-26 18:50:28 +00001255 off = skb_gro_offset(skb);
1256 hlen = off + sizeof(*iph);
1257 iph = skb_gro_header_fast(skb, off);
1258 if (skb_gro_header_hard(skb, hlen)) {
1259 iph = skb_gro_header_slow(skb, hlen, off);
1260 if (unlikely(!iph))
1261 goto out;
1262 }
Herbert Xu73cc19f2008-12-15 23:41:09 -08001263
Herbert Xu73cc19f2008-12-15 23:41:09 -08001264 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1265
1266 rcu_read_lock();
1267 ops = rcu_dereference(inet_protos[proto]);
1268 if (!ops || !ops->gro_receive)
1269 goto out_unlock;
1270
Herbert Xua5ad24b2009-02-08 18:00:39 +00001271 if (*(u8 *)iph != 0x45)
Herbert Xu73cc19f2008-12-15 23:41:09 -08001272 goto out_unlock;
1273
1274 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1275 goto out_unlock;
1276
Herbert Xu1075f3f2009-05-26 18:50:29 +00001277 id = ntohl(*(u32 *)&iph->id);
1278 flush = (u16)((ntohl(*(u32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
1279 id >>= 16;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001280
1281 for (p = *head; p; p = p->next) {
1282 struct iphdr *iph2;
1283
1284 if (!NAPI_GRO_CB(p)->same_flow)
1285 continue;
1286
1287 iph2 = ip_hdr(p);
1288
Herbert Xua5ad24b2009-02-08 18:00:39 +00001289 if ((iph->protocol ^ iph2->protocol) |
1290 (iph->tos ^ iph2->tos) |
1291 (iph->saddr ^ iph2->saddr) |
1292 (iph->daddr ^ iph2->daddr)) {
Herbert Xu73cc19f2008-12-15 23:41:09 -08001293 NAPI_GRO_CB(p)->same_flow = 0;
1294 continue;
1295 }
1296
1297 /* All fields must match except length and checksum. */
1298 NAPI_GRO_CB(p)->flush |=
Herbert Xua5ad24b2009-02-08 18:00:39 +00001299 (iph->ttl ^ iph2->ttl) |
1300 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
Herbert Xu73cc19f2008-12-15 23:41:09 -08001301
1302 NAPI_GRO_CB(p)->flush |= flush;
1303 }
1304
1305 NAPI_GRO_CB(skb)->flush |= flush;
Herbert Xu86911732009-01-29 14:19:50 +00001306 skb_gro_pull(skb, sizeof(*iph));
1307 skb_set_transport_header(skb, skb_gro_offset(skb));
Herbert Xu73cc19f2008-12-15 23:41:09 -08001308
1309 pp = ops->gro_receive(head, skb);
1310
1311out_unlock:
1312 rcu_read_unlock();
1313
1314out:
1315 NAPI_GRO_CB(skb)->flush |= flush;
1316
1317 return pp;
1318}
1319
1320static int inet_gro_complete(struct sk_buff *skb)
1321{
1322 struct net_protocol *ops;
1323 struct iphdr *iph = ip_hdr(skb);
1324 int proto = iph->protocol & (MAX_INET_PROTOS - 1);
1325 int err = -ENOSYS;
1326 __be16 newlen = htons(skb->len - skb_network_offset(skb));
1327
1328 csum_replace2(&iph->check, iph->tot_len, newlen);
1329 iph->tot_len = newlen;
1330
1331 rcu_read_lock();
1332 ops = rcu_dereference(inet_protos[proto]);
1333 if (WARN_ON(!ops || !ops->gro_complete))
1334 goto out_unlock;
1335
1336 err = ops->gro_complete(skb);
1337
1338out_unlock:
1339 rcu_read_unlock();
1340
1341 return err;
1342}
1343
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001344int inet_ctl_sock_create(struct sock **sk, unsigned short family,
Denis V. Lunev56772422008-04-03 14:28:30 -07001345 unsigned short type, unsigned char protocol,
1346 struct net *net)
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001347{
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001348 struct socket *sock;
1349 int rc = sock_create_kern(family, type, protocol, &sock);
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001350
1351 if (rc == 0) {
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001352 *sk = sock->sk;
1353 (*sk)->sk_allocation = GFP_ATOMIC;
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001354 /*
1355 * Unhash it so that IP input processing does not even see it,
1356 * we do not wish this socket to see incoming packets.
1357 */
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001358 (*sk)->sk_prot->unhash(*sk);
Denis V. Lunev56772422008-04-03 14:28:30 -07001359
1360 sk_change_net(*sk, net);
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001361 }
1362 return rc;
1363}
1364
1365EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1366
Herbert Xu5e0f0432007-04-24 21:53:35 -07001367unsigned long snmp_fold_field(void *mib[], int offt)
1368{
1369 unsigned long res = 0;
1370 int i;
1371
1372 for_each_possible_cpu(i) {
1373 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
1374 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
1375 }
1376 return res;
1377}
1378EXPORT_SYMBOL_GPL(snmp_fold_field);
1379
YOSHIFUJI Hideakic69bce22008-01-23 22:31:45 -08001380int snmp_mib_init(void *ptr[2], size_t mibsize)
Herbert Xu5e0f0432007-04-24 21:53:35 -07001381{
1382 BUG_ON(ptr == NULL);
Rusty Russell313e4582009-02-20 16:29:08 +09001383 ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long long));
Herbert Xu5e0f0432007-04-24 21:53:35 -07001384 if (!ptr[0])
1385 goto err0;
Rusty Russell313e4582009-02-20 16:29:08 +09001386 ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long long));
Herbert Xu5e0f0432007-04-24 21:53:35 -07001387 if (!ptr[1])
1388 goto err1;
1389 return 0;
1390err1:
1391 free_percpu(ptr[0]);
1392 ptr[0] = NULL;
1393err0:
1394 return -ENOMEM;
1395}
1396EXPORT_SYMBOL_GPL(snmp_mib_init);
1397
1398void snmp_mib_free(void *ptr[2])
1399{
1400 BUG_ON(ptr == NULL);
1401 free_percpu(ptr[0]);
1402 free_percpu(ptr[1]);
1403 ptr[0] = ptr[1] = NULL;
1404}
1405EXPORT_SYMBOL_GPL(snmp_mib_free);
1406
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407#ifdef CONFIG_IP_MULTICAST
1408static struct net_protocol igmp_protocol = {
1409 .handler = igmp_rcv,
Alexey Dobriyanb4ee07d2008-12-25 16:42:23 -08001410 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411};
1412#endif
1413
1414static struct net_protocol tcp_protocol = {
1415 .handler = tcp_v4_rcv,
1416 .err_handler = tcp_v4_err,
Herbert Xua430a432006-07-08 13:34:56 -07001417 .gso_send_check = tcp_v4_gso_send_check,
Herbert Xuf4c50d92006-06-22 03:02:40 -07001418 .gso_segment = tcp_tso_segment,
Herbert Xubf296b12008-12-15 23:43:36 -08001419 .gro_receive = tcp4_gro_receive,
1420 .gro_complete = tcp4_gro_complete,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001422 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423};
1424
1425static struct net_protocol udp_protocol = {
1426 .handler = udp_rcv,
1427 .err_handler = udp_err,
1428 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001429 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430};
1431
1432static struct net_protocol icmp_protocol = {
1433 .handler = icmp_rcv,
Herbert Xu8b7817f2007-12-12 10:44:43 -08001434 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001435 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436};
1437
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001438static __net_init int ipv4_mib_init_net(struct net *net)
1439{
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001440 if (snmp_mib_init((void **)net->mib.tcp_statistics,
1441 sizeof(struct tcp_mib)) < 0)
1442 goto err_tcp_mib;
Pavel Emelyanova20f5792008-07-18 04:02:42 -07001443 if (snmp_mib_init((void **)net->mib.ip_statistics,
1444 sizeof(struct ipstats_mib)) < 0)
1445 goto err_ip_mib;
Pavel Emelyanov61a7e262008-07-18 04:03:08 -07001446 if (snmp_mib_init((void **)net->mib.net_statistics,
1447 sizeof(struct linux_mib)) < 0)
1448 goto err_net_mib;
Pavel Emelyanov2f275f92008-07-18 04:03:27 -07001449 if (snmp_mib_init((void **)net->mib.udp_statistics,
1450 sizeof(struct udp_mib)) < 0)
1451 goto err_udp_mib;
Pavel Emelyanov386019d2008-07-18 04:03:45 -07001452 if (snmp_mib_init((void **)net->mib.udplite_statistics,
1453 sizeof(struct udp_mib)) < 0)
1454 goto err_udplite_mib;
Pavel Emelyanovb60538a2008-07-18 04:04:02 -07001455 if (snmp_mib_init((void **)net->mib.icmp_statistics,
1456 sizeof(struct icmp_mib)) < 0)
1457 goto err_icmp_mib;
Pavel Emelyanov923c6582008-07-18 04:04:22 -07001458 if (snmp_mib_init((void **)net->mib.icmpmsg_statistics,
1459 sizeof(struct icmpmsg_mib)) < 0)
1460 goto err_icmpmsg_mib;
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001461
1462 tcp_mib_init(net);
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001463 return 0;
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001464
Pavel Emelyanov923c6582008-07-18 04:04:22 -07001465err_icmpmsg_mib:
1466 snmp_mib_free((void **)net->mib.icmp_statistics);
Pavel Emelyanovb60538a2008-07-18 04:04:02 -07001467err_icmp_mib:
1468 snmp_mib_free((void **)net->mib.udplite_statistics);
Pavel Emelyanov386019d2008-07-18 04:03:45 -07001469err_udplite_mib:
1470 snmp_mib_free((void **)net->mib.udp_statistics);
Pavel Emelyanov2f275f92008-07-18 04:03:27 -07001471err_udp_mib:
1472 snmp_mib_free((void **)net->mib.net_statistics);
Pavel Emelyanov61a7e262008-07-18 04:03:08 -07001473err_net_mib:
1474 snmp_mib_free((void **)net->mib.ip_statistics);
Pavel Emelyanova20f5792008-07-18 04:02:42 -07001475err_ip_mib:
1476 snmp_mib_free((void **)net->mib.tcp_statistics);
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001477err_tcp_mib:
1478 return -ENOMEM;
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001479}
1480
1481static __net_exit void ipv4_mib_exit_net(struct net *net)
1482{
Pavel Emelyanov923c6582008-07-18 04:04:22 -07001483 snmp_mib_free((void **)net->mib.icmpmsg_statistics);
Pavel Emelyanovb60538a2008-07-18 04:04:02 -07001484 snmp_mib_free((void **)net->mib.icmp_statistics);
Pavel Emelyanov386019d2008-07-18 04:03:45 -07001485 snmp_mib_free((void **)net->mib.udplite_statistics);
Pavel Emelyanov2f275f92008-07-18 04:03:27 -07001486 snmp_mib_free((void **)net->mib.udp_statistics);
Pavel Emelyanov61a7e262008-07-18 04:03:08 -07001487 snmp_mib_free((void **)net->mib.net_statistics);
Pavel Emelyanova20f5792008-07-18 04:02:42 -07001488 snmp_mib_free((void **)net->mib.ip_statistics);
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001489 snmp_mib_free((void **)net->mib.tcp_statistics);
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001490}
1491
1492static __net_initdata struct pernet_operations ipv4_mib_ops = {
1493 .init = ipv4_mib_init_net,
1494 .exit = ipv4_mib_exit_net,
1495};
1496
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497static int __init init_ipv4_mibs(void)
1498{
Pavel Emelyanovd89cbbb2008-07-18 04:04:51 -07001499 return register_pernet_subsys(&ipv4_mib_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500}
1501
1502static int ipv4_proc_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503
Herbert Xu30e224d2005-07-05 14:40:10 -07001504/*
1505 * IP protocol layer initialiser
1506 */
1507
Stephen Hemminger7546dd92009-03-09 08:18:29 +00001508static struct packet_type ip_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -08001509 .type = cpu_to_be16(ETH_P_IP),
Herbert Xu30e224d2005-07-05 14:40:10 -07001510 .func = ip_rcv,
Herbert Xua430a432006-07-08 13:34:56 -07001511 .gso_send_check = inet_gso_send_check,
Herbert Xuf4c50d92006-06-22 03:02:40 -07001512 .gso_segment = inet_gso_segment,
Herbert Xu73cc19f2008-12-15 23:41:09 -08001513 .gro_receive = inet_gro_receive,
1514 .gro_complete = inet_gro_complete,
Herbert Xu30e224d2005-07-05 14:40:10 -07001515};
1516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517static int __init inet_init(void)
1518{
1519 struct sk_buff *dummy_skb;
1520 struct inet_protosw *q;
1521 struct list_head *r;
1522 int rc = -EINVAL;
1523
YOSHIFUJI Hideakief047f52006-09-01 00:29:06 -07001524 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525
1526 rc = proto_register(&tcp_prot, 1);
1527 if (rc)
1528 goto out;
1529
1530 rc = proto_register(&udp_prot, 1);
1531 if (rc)
1532 goto out_unregister_tcp_proto;
1533
1534 rc = proto_register(&raw_prot, 1);
1535 if (rc)
1536 goto out_unregister_udp_proto;
1537
1538 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001539 * Tell SOCKET that we are alive...
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 */
1541
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001542 (void)sock_register(&inet_family_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
Al Virobd7b1532008-07-15 16:00:59 -04001544#ifdef CONFIG_SYSCTL
1545 ip_static_sysctl_init();
1546#endif
1547
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 /*
1549 * Add all the base protocols.
1550 */
1551
1552 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1553 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1554 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1555 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1556 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1557 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1558#ifdef CONFIG_IP_MULTICAST
1559 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1560 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1561#endif
1562
1563 /* Register the socket-side information for inet_create. */
1564 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1565 INIT_LIST_HEAD(r);
1566
1567 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1568 inet_register_protosw(q);
1569
1570 /*
1571 * Set the ARP module up
1572 */
1573
1574 arp_init();
1575
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001576 /*
1577 * Set the IP module up
1578 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579
1580 ip_init();
1581
Denis V. Lunev9b0f9762008-02-29 11:13:15 -08001582 tcp_v4_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583
1584 /* Setup TCP slab cache for open requests. */
1585 tcp_init();
1586
Hideo Aoki95766ff2007-12-31 00:29:24 -08001587 /* Setup UDP memory threshold */
1588 udp_init();
1589
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001590 /* Add UDP-Lite (RFC 3828) */
1591 udplite4_register();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592
1593 /*
1594 * Set the ICMP layer up
1595 */
1596
Denis V. Luneva5710d62008-02-29 11:14:50 -08001597 if (icmp_init() < 0)
1598 panic("Failed to create the ICMP control socket.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599
1600 /*
1601 * Initialise the multicast router
1602 */
1603#if defined(CONFIG_IP_MROUTE)
Wang Chen03d2f892008-07-03 12:13:36 +08001604 if (ip_mr_init())
1605 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606#endif
1607 /*
1608 * Initialise per-cpu ipv4 mibs
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001609 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610
Stephen Hemminger132adf52007-03-08 20:44:43 -08001611 if (init_ipv4_mibs())
Wang Chen03d2f892008-07-03 12:13:36 +08001612 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n");
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001613
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 ipv4_proc_init();
1615
1616 ipfrag_init();
1617
Herbert Xu30e224d2005-07-05 14:40:10 -07001618 dev_add_pack(&ip_packet_type);
1619
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 rc = 0;
1621out:
1622 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623out_unregister_udp_proto:
1624 proto_unregister(&udp_prot);
Olaf Kirch321efff2006-09-27 16:33:45 -07001625out_unregister_tcp_proto:
1626 proto_unregister(&tcp_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627 goto out;
1628}
1629
Heiko Carstensa536e072006-04-28 15:19:17 -07001630fs_initcall(inet_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631
1632/* ------------------------------------------------------------------------ */
1633
1634#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635static int __init ipv4_proc_init(void)
1636{
1637 int rc = 0;
1638
1639 if (raw_proc_init())
1640 goto out_raw;
1641 if (tcp4_proc_init())
1642 goto out_tcp;
1643 if (udp4_proc_init())
1644 goto out_udp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645 if (ip_misc_proc_init())
1646 goto out_misc;
1647out:
1648 return rc;
1649out_misc:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 udp4_proc_exit();
1651out_udp:
1652 tcp4_proc_exit();
1653out_tcp:
1654 raw_proc_exit();
1655out_raw:
1656 rc = -ENOMEM;
1657 goto out;
1658}
1659
1660#else /* CONFIG_PROC_FS */
1661static int __init ipv4_proc_init(void)
1662{
1663 return 0;
1664}
1665#endif /* CONFIG_PROC_FS */
1666
1667MODULE_ALIAS_NETPROTO(PF_INET);
1668
1669EXPORT_SYMBOL(inet_accept);
1670EXPORT_SYMBOL(inet_bind);
1671EXPORT_SYMBOL(inet_dgram_connect);
1672EXPORT_SYMBOL(inet_dgram_ops);
1673EXPORT_SYMBOL(inet_getname);
1674EXPORT_SYMBOL(inet_ioctl);
1675EXPORT_SYMBOL(inet_listen);
1676EXPORT_SYMBOL(inet_register_protosw);
1677EXPORT_SYMBOL(inet_release);
1678EXPORT_SYMBOL(inet_sendmsg);
1679EXPORT_SYMBOL(inet_shutdown);
1680EXPORT_SYMBOL(inet_sock_destruct);
1681EXPORT_SYMBOL(inet_stream_connect);
1682EXPORT_SYMBOL(inet_stream_ops);
1683EXPORT_SYMBOL(inet_unregister_protosw);
Neil Hormancdac4e02005-06-13 15:12:33 -07001684EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);