blob: cf358c84c44060353b69b5ef26129f8a9cb2a266 [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 *
8 * Version: $Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $
9 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Changes (see also sock.c)
16 *
17 * piggy,
18 * Karl Knutson : Socket protocol table
19 * A.N.Kuznetsov : Socket death error in accept().
20 * John Richardson : Fix non blocking error in connect()
21 * so sockets that fail to connect
22 * don't return -EINPROGRESS.
23 * Alan Cox : Asynchronous I/O support
24 * Alan Cox : Keep correct socket pointer on sock
25 * structures
26 * when accept() ed
27 * Alan Cox : Semantics of SO_LINGER aren't state
28 * moved to close when you look carefully.
29 * With this fixed and the accept bug fixed
30 * some RPC stuff seems happier.
31 * Niibe Yutaka : 4.4BSD style write async I/O
32 * Alan Cox,
33 * Tony Gale : Fixed reuse semantics.
34 * Alan Cox : bind() shouldn't abort existing but dead
35 * sockets. Stops FTP netin:.. I hope.
36 * Alan Cox : bind() works correctly for RAW sockets.
37 * Note that FreeBSD at least was broken
38 * in this respect so be careful with
39 * compatibility tests...
40 * Alan Cox : routing cache support
41 * Alan Cox : memzero the socket structure for
42 * compactness.
43 * Matt Day : nonblock connect error handler
44 * Alan Cox : Allow large numbers of pending sockets
45 * (eg for big web sites), but only if
46 * specifically application requested.
47 * Alan Cox : New buffering throughout IP. Used
48 * dumbly.
49 * Alan Cox : New buffering now used smartly.
50 * Alan Cox : BSD rather than common sense
51 * interpretation of listen.
52 * Germano Caronni : Assorted small races.
53 * Alan Cox : sendmsg/recvmsg basic support.
54 * Alan Cox : Only sendmsg/recvmsg now supported.
55 * Alan Cox : Locked down bind (see security list).
56 * Alan Cox : Loosened bind a little.
57 * Mike McLagan : ADD/DEL DLCI Ioctls
58 * Willy Konynenberg : Transparent proxying support.
59 * David S. Miller : New socket lookup architecture.
60 * Some other random speedups.
61 * Cyrus Durgin : Cleaned up file for kmod hacks.
62 * Andi Kleen : Fix inet_stream_connect TCP race.
63 *
64 * This program is free software; you can redistribute it and/or
65 * modify it under the terms of the GNU General Public License
66 * as published by the Free Software Foundation; either version
67 * 2 of the License, or (at your option) any later version.
68 */
69
Herbert Xuf4c50d92006-06-22 03:02:40 -070070#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <linux/errno.h>
72#include <linux/types.h>
73#include <linux/socket.h>
74#include <linux/in.h>
75#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <linux/module.h>
77#include <linux/sched.h>
78#include <linux/timer.h>
79#include <linux/string.h>
80#include <linux/sockios.h>
81#include <linux/net.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080082#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#include <linux/fcntl.h>
84#include <linux/mm.h>
85#include <linux/interrupt.h>
86#include <linux/stat.h>
87#include <linux/init.h>
88#include <linux/poll.h>
89#include <linux/netfilter_ipv4.h>
90
91#include <asm/uaccess.h>
92#include <asm/system.h>
93
94#include <linux/smp_lock.h>
95#include <linux/inet.h>
96#include <linux/igmp.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020097#include <linux/inetdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#include <linux/netdevice.h>
99#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108#include <linux/skbuff.h>
109#include <net/sock.h>
110#include <net/raw.h>
111#include <net/icmp.h>
112#include <net/ipip.h>
113#include <net/inet_common.h>
114#include <net/xfrm.h>
115#ifdef CONFIG_IP_MROUTE
116#include <linux/mroute.h>
117#endif
118
Eric Dumazetba899662005-08-26 12:05:31 -0700119DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121extern void ip_mc_drop_socket(struct sock *sk);
122
123/* The inetsw table contains everything that inet_create needs to
124 * build a new socket.
125 */
126static struct list_head inetsw[SOCK_MAX];
127static DEFINE_SPINLOCK(inetsw_lock);
128
129/* New destruction routine */
130
131void inet_sock_destruct(struct sock *sk)
132{
133 struct inet_sock *inet = inet_sk(sk);
134
135 __skb_queue_purge(&sk->sk_receive_queue);
136 __skb_queue_purge(&sk->sk_error_queue);
137
138 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
139 printk("Attempt to release TCP socket in state %d %p\n",
140 sk->sk_state, sk);
141 return;
142 }
143 if (!sock_flag(sk, SOCK_DEAD)) {
144 printk("Attempt to release alive inet socket %p\n", sk);
145 return;
146 }
147
148 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
149 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
150 BUG_TRAP(!sk->sk_wmem_queued);
151 BUG_TRAP(!sk->sk_forward_alloc);
152
Jesper Juhla51482b2005-11-08 09:41:34 -0800153 kfree(inet->opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 dst_release(sk->sk_dst_cache);
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700155 sk_refcnt_debug_dec(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
158/*
159 * The routines beyond this point handle the behaviour of an AF_INET
160 * socket object. Mostly it punts to the subprotocols of IP to do
161 * the work.
162 */
163
164/*
165 * Automatically bind an unbound socket.
166 */
167
168static int inet_autobind(struct sock *sk)
169{
170 struct inet_sock *inet;
171 /* We may need to bind the socket. */
172 lock_sock(sk);
173 inet = inet_sk(sk);
174 if (!inet->num) {
175 if (sk->sk_prot->get_port(sk, 0)) {
176 release_sock(sk);
177 return -EAGAIN;
178 }
179 inet->sport = htons(inet->num);
180 }
181 release_sock(sk);
182 return 0;
183}
184
185/*
186 * Move a socket into listening state.
187 */
188int inet_listen(struct socket *sock, int backlog)
189{
190 struct sock *sk = sock->sk;
191 unsigned char old_state;
192 int err;
193
194 lock_sock(sk);
195
196 err = -EINVAL;
197 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
198 goto out;
199
200 old_state = sk->sk_state;
201 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
202 goto out;
203
204 /* Really, if the socket is already in listen state
205 * we can only allow the backlog to be adjusted.
206 */
207 if (old_state != TCP_LISTEN) {
Eric Dumazet72a3eff2006-11-16 02:30:37 -0800208 err = inet_csk_listen_start(sk, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 if (err)
210 goto out;
211 }
212 sk->sk_max_ack_backlog = backlog;
213 err = 0;
214
215out:
216 release_sock(sk);
217 return err;
218}
219
220/*
221 * Create an inet socket.
222 */
223
224static int inet_create(struct socket *sock, int protocol)
225{
226 struct sock *sk;
227 struct list_head *p;
228 struct inet_protosw *answer;
229 struct inet_sock *inet;
230 struct proto *answer_prot;
231 unsigned char answer_flags;
232 char answer_no_check;
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700233 int try_loading_module = 0;
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800234 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
236 sock->state = SS_UNCONNECTED;
237
238 /* Look for the requested type/protocol pair. */
239 answer = NULL;
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700240lookup_protocol:
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800241 err = -ESOCKTNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 rcu_read_lock();
243 list_for_each_rcu(p, &inetsw[sock->type]) {
244 answer = list_entry(p, struct inet_protosw, list);
245
246 /* Check the non-wild match. */
247 if (protocol == answer->protocol) {
248 if (protocol != IPPROTO_IP)
249 break;
250 } else {
251 /* Check for the two wild cases. */
252 if (IPPROTO_IP == protocol) {
253 protocol = answer->protocol;
254 break;
255 }
256 if (IPPROTO_IP == answer->protocol)
257 break;
258 }
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800259 err = -EPROTONOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 answer = NULL;
261 }
262
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700263 if (unlikely(answer == NULL)) {
264 if (try_loading_module < 2) {
265 rcu_read_unlock();
266 /*
267 * Be more specific, e.g. net-pf-2-proto-132-type-1
268 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
269 */
270 if (++try_loading_module == 1)
271 request_module("net-pf-%d-proto-%d-type-%d",
272 PF_INET, protocol, sock->type);
273 /*
274 * Fall back to generic, e.g. net-pf-2-proto-132
275 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
276 */
277 else
278 request_module("net-pf-%d-proto-%d",
279 PF_INET, protocol);
280 goto lookup_protocol;
281 } else
282 goto out_rcu_unlock;
283 }
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 err = -EPERM;
286 if (answer->capability > 0 && !capable(answer->capability))
287 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289 sock->ops = answer->ops;
290 answer_prot = answer->prot;
291 answer_no_check = answer->no_check;
292 answer_flags = answer->flags;
293 rcu_read_unlock();
294
295 BUG_TRAP(answer_prot->slab != NULL);
296
297 err = -ENOBUFS;
298 sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1);
299 if (sk == NULL)
300 goto out;
301
302 err = 0;
303 sk->sk_no_check = answer_no_check;
304 if (INET_PROTOSW_REUSE & answer_flags)
305 sk->sk_reuse = 1;
306
307 inet = inet_sk(sk);
Paul Moore469de9b2007-01-09 14:37:06 -0800308 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
310 if (SOCK_RAW == sock->type) {
311 inet->num = protocol;
312 if (IPPROTO_RAW == protocol)
313 inet->hdrincl = 1;
314 }
315
316 if (ipv4_config.no_pmtu_disc)
317 inet->pmtudisc = IP_PMTUDISC_DONT;
318 else
319 inet->pmtudisc = IP_PMTUDISC_WANT;
320
321 inet->id = 0;
322
323 sock_init_data(sock, sk);
324
325 sk->sk_destruct = inet_sock_destruct;
326 sk->sk_family = PF_INET;
327 sk->sk_protocol = protocol;
328 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
329
330 inet->uc_ttl = -1;
331 inet->mc_loop = 1;
332 inet->mc_ttl = 1;
333 inet->mc_index = 0;
334 inet->mc_list = NULL;
335
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700336 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 if (inet->num) {
339 /* It assumes that any protocol which allows
340 * the user to assign a number at socket
341 * creation time automatically
342 * shares.
343 */
344 inet->sport = htons(inet->num);
345 /* Add to protocol hash chains. */
346 sk->sk_prot->hash(sk);
347 }
348
349 if (sk->sk_prot->init) {
350 err = sk->sk_prot->init(sk);
351 if (err)
352 sk_common_release(sk);
353 }
354out:
355 return err;
356out_rcu_unlock:
357 rcu_read_unlock();
358 goto out;
359}
360
361
362/*
363 * The peer socket should always be NULL (or else). When we call this
364 * function we are destroying the object and from then on nobody
365 * should refer to it.
366 */
367int inet_release(struct socket *sock)
368{
369 struct sock *sk = sock->sk;
370
371 if (sk) {
372 long timeout;
373
374 /* Applications forget to leave groups before exiting */
375 ip_mc_drop_socket(sk);
376
377 /* If linger is set, we don't return until the close
378 * is complete. Otherwise we return immediately. The
379 * actually closing is done the same either way.
380 *
381 * If the close is due to the process exiting, we never
382 * linger..
383 */
384 timeout = 0;
385 if (sock_flag(sk, SOCK_LINGER) &&
386 !(current->flags & PF_EXITING))
387 timeout = sk->sk_lingertime;
388 sock->sk = NULL;
389 sk->sk_prot->close(sk, timeout);
390 }
391 return 0;
392}
393
394/* It is off by default, see below. */
Brian Haleyab32ea52006-09-22 14:15:41 -0700395int sysctl_ip_nonlocal_bind __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
397int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
398{
399 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
400 struct sock *sk = sock->sk;
401 struct inet_sock *inet = inet_sk(sk);
402 unsigned short snum;
403 int chk_addr_ret;
404 int err;
405
406 /* If the socket has its own bind function then use it. (RAW) */
407 if (sk->sk_prot->bind) {
408 err = sk->sk_prot->bind(sk, uaddr, addr_len);
409 goto out;
410 }
411 err = -EINVAL;
412 if (addr_len < sizeof(struct sockaddr_in))
413 goto out;
414
415 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
416
417 /* Not specified by any standard per-se, however it breaks too
418 * many applications when removed. It is unfortunate since
419 * allowing applications to make a non-local bind solves
420 * several problems with systems using dynamic addressing.
421 * (ie. your servers still start up even if your ISDN link
422 * is temporarily down)
423 */
424 err = -EADDRNOTAVAIL;
425 if (!sysctl_ip_nonlocal_bind &&
426 !inet->freebind &&
427 addr->sin_addr.s_addr != INADDR_ANY &&
428 chk_addr_ret != RTN_LOCAL &&
429 chk_addr_ret != RTN_MULTICAST &&
430 chk_addr_ret != RTN_BROADCAST)
431 goto out;
432
433 snum = ntohs(addr->sin_port);
434 err = -EACCES;
435 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
436 goto out;
437
438 /* We keep a pair of addresses. rcv_saddr is the one
439 * used by hash lookups, and saddr is used for transmit.
440 *
441 * In the BSD API these are the same except where it
442 * would be illegal to use them (multicast/broadcast) in
443 * which case the sending device address is used.
444 */
445 lock_sock(sk);
446
447 /* Check these errors (active socket, double bind). */
448 err = -EINVAL;
449 if (sk->sk_state != TCP_CLOSE || inet->num)
450 goto out_release_sock;
451
452 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
453 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
454 inet->saddr = 0; /* Use device */
455
456 /* Make sure we are allowed to bind here. */
457 if (sk->sk_prot->get_port(sk, snum)) {
458 inet->saddr = inet->rcv_saddr = 0;
459 err = -EADDRINUSE;
460 goto out_release_sock;
461 }
462
463 if (inet->rcv_saddr)
464 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
465 if (snum)
466 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
467 inet->sport = htons(inet->num);
468 inet->daddr = 0;
469 inet->dport = 0;
470 sk_dst_reset(sk);
471 err = 0;
472out_release_sock:
473 release_sock(sk);
474out:
475 return err;
476}
477
478int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
479 int addr_len, int flags)
480{
481 struct sock *sk = sock->sk;
482
483 if (uaddr->sa_family == AF_UNSPEC)
484 return sk->sk_prot->disconnect(sk, flags);
485
486 if (!inet_sk(sk)->num && inet_autobind(sk))
487 return -EAGAIN;
488 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
489}
490
491static long inet_wait_for_connect(struct sock *sk, long timeo)
492{
493 DEFINE_WAIT(wait);
494
495 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
496
497 /* Basic assumption: if someone sets sk->sk_err, he _must_
498 * change state of the socket from TCP_SYN_*.
499 * Connect() does not allow to get error notifications
500 * without closing the socket.
501 */
502 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
503 release_sock(sk);
504 timeo = schedule_timeout(timeo);
505 lock_sock(sk);
506 if (signal_pending(current) || !timeo)
507 break;
508 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
509 }
510 finish_wait(sk->sk_sleep, &wait);
511 return timeo;
512}
513
514/*
515 * Connect to a remote host. There is regrettably still a little
516 * TCP 'magic' in here.
517 */
518int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
519 int addr_len, int flags)
520{
521 struct sock *sk = sock->sk;
522 int err;
523 long timeo;
524
525 lock_sock(sk);
526
527 if (uaddr->sa_family == AF_UNSPEC) {
528 err = sk->sk_prot->disconnect(sk, flags);
529 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
530 goto out;
531 }
532
533 switch (sock->state) {
534 default:
535 err = -EINVAL;
536 goto out;
537 case SS_CONNECTED:
538 err = -EISCONN;
539 goto out;
540 case SS_CONNECTING:
541 err = -EALREADY;
542 /* Fall out of switch with err, set for this state */
543 break;
544 case SS_UNCONNECTED:
545 err = -EISCONN;
546 if (sk->sk_state != TCP_CLOSE)
547 goto out;
548
549 err = sk->sk_prot->connect(sk, uaddr, addr_len);
550 if (err < 0)
551 goto out;
552
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900553 sock->state = SS_CONNECTING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
555 /* Just entered SS_CONNECTING state; the only
556 * difference is that return value in non-blocking
557 * case is EINPROGRESS, rather than EALREADY.
558 */
559 err = -EINPROGRESS;
560 break;
561 }
562
563 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
564
565 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
566 /* Error code is set above */
567 if (!timeo || !inet_wait_for_connect(sk, timeo))
568 goto out;
569
570 err = sock_intr_errno(timeo);
571 if (signal_pending(current))
572 goto out;
573 }
574
575 /* Connection was closed by RST, timeout, ICMP error
576 * or another process disconnected us.
577 */
578 if (sk->sk_state == TCP_CLOSE)
579 goto sock_error;
580
581 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
582 * and error was received after socket entered established state.
583 * Hence, it is handled normally after connect() return successfully.
584 */
585
586 sock->state = SS_CONNECTED;
587 err = 0;
588out:
589 release_sock(sk);
590 return err;
591
592sock_error:
593 err = sock_error(sk) ? : -ECONNABORTED;
594 sock->state = SS_UNCONNECTED;
595 if (sk->sk_prot->disconnect(sk, flags))
596 sock->state = SS_DISCONNECTING;
597 goto out;
598}
599
600/*
601 * Accept a pending connection. The TCP layer now gives BSD semantics.
602 */
603
604int inet_accept(struct socket *sock, struct socket *newsock, int flags)
605{
606 struct sock *sk1 = sock->sk;
607 int err = -EINVAL;
608 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
609
610 if (!sk2)
611 goto do_err;
612
613 lock_sock(sk2);
614
615 BUG_TRAP((1 << sk2->sk_state) &
616 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE));
617
618 sock_graft(sk2, newsock);
619
620 newsock->state = SS_CONNECTED;
621 err = 0;
622 release_sock(sk2);
623do_err:
624 return err;
625}
626
627
628/*
629 * This does both peername and sockname.
630 */
631int inet_getname(struct socket *sock, struct sockaddr *uaddr,
632 int *uaddr_len, int peer)
633{
634 struct sock *sk = sock->sk;
635 struct inet_sock *inet = inet_sk(sk);
636 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
637
638 sin->sin_family = AF_INET;
639 if (peer) {
640 if (!inet->dport ||
641 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
642 peer == 1))
643 return -ENOTCONN;
644 sin->sin_port = inet->dport;
645 sin->sin_addr.s_addr = inet->daddr;
646 } else {
Al Viro714e85b2006-11-14 20:51:49 -0800647 __be32 addr = inet->rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 if (!addr)
649 addr = inet->saddr;
650 sin->sin_port = inet->sport;
651 sin->sin_addr.s_addr = addr;
652 }
653 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
654 *uaddr_len = sizeof(*sin);
655 return 0;
656}
657
658int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
659 size_t size)
660{
661 struct sock *sk = sock->sk;
662
663 /* We may need to bind the socket. */
664 if (!inet_sk(sk)->num && inet_autobind(sk))
665 return -EAGAIN;
666
667 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
668}
669
670
671static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
672{
673 struct sock *sk = sock->sk;
674
675 /* We may need to bind the socket. */
676 if (!inet_sk(sk)->num && inet_autobind(sk))
677 return -EAGAIN;
678
679 if (sk->sk_prot->sendpage)
680 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
681 return sock_no_sendpage(sock, page, offset, size, flags);
682}
683
684
685int inet_shutdown(struct socket *sock, int how)
686{
687 struct sock *sk = sock->sk;
688 int err = 0;
689
690 /* This should really check to make sure
691 * the socket is a TCP socket. (WHY AC...)
692 */
693 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
694 1->2 bit 2 snds.
695 2->3 */
696 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
697 return -EINVAL;
698
699 lock_sock(sk);
700 if (sock->state == SS_CONNECTING) {
701 if ((1 << sk->sk_state) &
702 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
703 sock->state = SS_DISCONNECTING;
704 else
705 sock->state = SS_CONNECTED;
706 }
707
708 switch (sk->sk_state) {
709 case TCP_CLOSE:
710 err = -ENOTCONN;
711 /* Hack to wake up other listeners, who can poll for
712 POLLHUP, even on eg. unconnected UDP sockets -- RR */
713 default:
714 sk->sk_shutdown |= how;
715 if (sk->sk_prot->shutdown)
716 sk->sk_prot->shutdown(sk, how);
717 break;
718
719 /* Remaining two branches are temporary solution for missing
720 * close() in multithreaded environment. It is _not_ a good idea,
721 * but we have no choice until close() is repaired at VFS level.
722 */
723 case TCP_LISTEN:
724 if (!(how & RCV_SHUTDOWN))
725 break;
726 /* Fall through */
727 case TCP_SYN_SENT:
728 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
729 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
730 break;
731 }
732
733 /* Wake up anyone sleeping in poll. */
734 sk->sk_state_change(sk);
735 release_sock(sk);
736 return err;
737}
738
739/*
740 * ioctl() calls you can issue on an INET socket. Most of these are
741 * device configuration and stuff and very rarely used. Some ioctls
742 * pass on to the socket itself.
743 *
744 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
745 * loads the devconfigure module does its configuring and unloads it.
746 * There's a good 20K of config code hanging around the kernel.
747 */
748
749int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
750{
751 struct sock *sk = sock->sk;
752 int err = 0;
753
754 switch (cmd) {
755 case SIOCGSTAMP:
756 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
757 break;
758 case SIOCADDRT:
759 case SIOCDELRT:
760 case SIOCRTMSG:
761 err = ip_rt_ioctl(cmd, (void __user *)arg);
762 break;
763 case SIOCDARP:
764 case SIOCGARP:
765 case SIOCSARP:
766 err = arp_ioctl(cmd, (void __user *)arg);
767 break;
768 case SIOCGIFADDR:
769 case SIOCSIFADDR:
770 case SIOCGIFBRDADDR:
771 case SIOCSIFBRDADDR:
772 case SIOCGIFNETMASK:
773 case SIOCSIFNETMASK:
774 case SIOCGIFDSTADDR:
775 case SIOCSIFDSTADDR:
776 case SIOCSIFPFLAGS:
777 case SIOCGIFPFLAGS:
778 case SIOCSIFFLAGS:
779 err = devinet_ioctl(cmd, (void __user *)arg);
780 break;
781 default:
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -0800782 if (sk->sk_prot->ioctl)
783 err = sk->sk_prot->ioctl(sk, cmd, arg);
784 else
785 err = -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 break;
787 }
788 return err;
789}
790
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800791const struct proto_ops inet_stream_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800792 .family = PF_INET,
793 .owner = THIS_MODULE,
794 .release = inet_release,
795 .bind = inet_bind,
796 .connect = inet_stream_connect,
797 .socketpair = sock_no_socketpair,
798 .accept = inet_accept,
799 .getname = inet_getname,
800 .poll = tcp_poll,
801 .ioctl = inet_ioctl,
802 .listen = inet_listen,
803 .shutdown = inet_shutdown,
804 .setsockopt = sock_common_setsockopt,
805 .getsockopt = sock_common_getsockopt,
806 .sendmsg = inet_sendmsg,
807 .recvmsg = sock_common_recvmsg,
808 .mmap = sock_no_mmap,
809 .sendpage = tcp_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800810#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800811 .compat_setsockopt = compat_sock_common_setsockopt,
812 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800813#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814};
815
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800816const struct proto_ops inet_dgram_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800817 .family = PF_INET,
818 .owner = THIS_MODULE,
819 .release = inet_release,
820 .bind = inet_bind,
821 .connect = inet_dgram_connect,
822 .socketpair = sock_no_socketpair,
823 .accept = sock_no_accept,
824 .getname = inet_getname,
825 .poll = udp_poll,
826 .ioctl = inet_ioctl,
827 .listen = sock_no_listen,
828 .shutdown = inet_shutdown,
829 .setsockopt = sock_common_setsockopt,
830 .getsockopt = sock_common_getsockopt,
831 .sendmsg = inet_sendmsg,
832 .recvmsg = sock_common_recvmsg,
833 .mmap = sock_no_mmap,
834 .sendpage = inet_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800835#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800836 .compat_setsockopt = compat_sock_common_setsockopt,
837 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800838#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839};
840
841/*
842 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
843 * udp_poll
844 */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800845static const struct proto_ops inet_sockraw_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800846 .family = PF_INET,
847 .owner = THIS_MODULE,
848 .release = inet_release,
849 .bind = inet_bind,
850 .connect = inet_dgram_connect,
851 .socketpair = sock_no_socketpair,
852 .accept = sock_no_accept,
853 .getname = inet_getname,
854 .poll = datagram_poll,
855 .ioctl = inet_ioctl,
856 .listen = sock_no_listen,
857 .shutdown = inet_shutdown,
858 .setsockopt = sock_common_setsockopt,
859 .getsockopt = sock_common_getsockopt,
860 .sendmsg = inet_sendmsg,
861 .recvmsg = sock_common_recvmsg,
862 .mmap = sock_no_mmap,
863 .sendpage = inet_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800864#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800865 .compat_setsockopt = compat_sock_common_setsockopt,
866 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800867#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868};
869
870static struct net_proto_family inet_family_ops = {
871 .family = PF_INET,
872 .create = inet_create,
873 .owner = THIS_MODULE,
874};
875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876/* Upon startup we insert all the elements in inetsw_array[] into
877 * the linked list inetsw.
878 */
879static struct inet_protosw inetsw_array[] =
880{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900881 {
882 .type = SOCK_STREAM,
883 .protocol = IPPROTO_TCP,
884 .prot = &tcp_prot,
885 .ops = &inet_stream_ops,
886 .capability = -1,
887 .no_check = 0,
888 .flags = INET_PROTOSW_PERMANENT |
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800889 INET_PROTOSW_ICSK,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900890 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900892 {
893 .type = SOCK_DGRAM,
894 .protocol = IPPROTO_UDP,
895 .prot = &udp_prot,
896 .ops = &inet_dgram_ops,
897 .capability = -1,
898 .no_check = UDP_CSUM_DEFAULT,
899 .flags = INET_PROTOSW_PERMANENT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 },
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
903 {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900904 .type = SOCK_RAW,
905 .protocol = IPPROTO_IP, /* wild card */
906 .prot = &raw_prot,
907 .ops = &inet_sockraw_ops,
908 .capability = CAP_NET_RAW,
909 .no_check = UDP_CSUM_DEFAULT,
910 .flags = INET_PROTOSW_REUSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 }
912};
913
914#define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw))
915
916void inet_register_protosw(struct inet_protosw *p)
917{
918 struct list_head *lh;
919 struct inet_protosw *answer;
920 int protocol = p->protocol;
921 struct list_head *last_perm;
922
923 spin_lock_bh(&inetsw_lock);
924
925 if (p->type >= SOCK_MAX)
926 goto out_illegal;
927
928 /* If we are trying to override a permanent protocol, bail. */
929 answer = NULL;
930 last_perm = &inetsw[p->type];
931 list_for_each(lh, &inetsw[p->type]) {
932 answer = list_entry(lh, struct inet_protosw, list);
933
934 /* Check only the non-wild match. */
935 if (INET_PROTOSW_PERMANENT & answer->flags) {
936 if (protocol == answer->protocol)
937 break;
938 last_perm = lh;
939 }
940
941 answer = NULL;
942 }
943 if (answer)
944 goto out_permanent;
945
946 /* Add the new entry after the last permanent entry if any, so that
947 * the new entry does not override a permanent entry when matched with
948 * a wild-card protocol. But it is allowed to override any existing
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900949 * non-permanent entry. This means that when we remove this entry, the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 * system automatically returns to the old behavior.
951 */
952 list_add_rcu(&p->list, last_perm);
953out:
954 spin_unlock_bh(&inetsw_lock);
955
956 synchronize_net();
957
958 return;
959
960out_permanent:
961 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
962 protocol);
963 goto out;
964
965out_illegal:
966 printk(KERN_ERR
967 "Ignoring attempt to register invalid socket type %d.\n",
968 p->type);
969 goto out;
970}
971
972void inet_unregister_protosw(struct inet_protosw *p)
973{
974 if (INET_PROTOSW_PERMANENT & p->flags) {
975 printk(KERN_ERR
976 "Attempt to unregister permanent protocol %d.\n",
977 p->protocol);
978 } else {
979 spin_lock_bh(&inetsw_lock);
980 list_del_rcu(&p->list);
981 spin_unlock_bh(&inetsw_lock);
982
983 synchronize_net();
984 }
985}
986
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -0700987/*
988 * Shall we try to damage output packets if routing dev changes?
989 */
990
Brian Haleyab32ea52006-09-22 14:15:41 -0700991int sysctl_ip_dynaddr __read_mostly;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -0700992
993static int inet_sk_reselect_saddr(struct sock *sk)
994{
995 struct inet_sock *inet = inet_sk(sk);
996 int err;
997 struct rtable *rt;
Al Viro714e85b2006-11-14 20:51:49 -0800998 __be32 old_saddr = inet->saddr;
999 __be32 new_saddr;
Al Virobada8ad2006-09-26 21:27:15 -07001000 __be32 daddr = inet->daddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001001
1002 if (inet->opt && inet->opt->srr)
1003 daddr = inet->opt->faddr;
1004
1005 /* Query new route. */
1006 err = ip_route_connect(&rt, daddr, 0,
1007 RT_CONN_FLAGS(sk),
1008 sk->sk_bound_dev_if,
1009 sk->sk_protocol,
David S. Miller8eb90862007-02-08 02:09:21 -08001010 inet->sport, inet->dport, sk, 0);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001011 if (err)
1012 return err;
1013
1014 sk_setup_caps(sk, &rt->u.dst);
1015
1016 new_saddr = rt->rt_src;
1017
1018 if (new_saddr == old_saddr)
1019 return 0;
1020
1021 if (sysctl_ip_dynaddr > 1) {
1022 printk(KERN_INFO "%s(): shifting inet->"
1023 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n",
1024 __FUNCTION__,
1025 NIPQUAD(old_saddr),
1026 NIPQUAD(new_saddr));
1027 }
1028
1029 inet->saddr = inet->rcv_saddr = new_saddr;
1030
1031 /*
1032 * XXX The only one ugly spot where we need to
1033 * XXX really change the sockets identity after
1034 * XXX it has entered the hashes. -DaveM
1035 *
1036 * Besides that, it does not check for connection
1037 * uniqueness. Wait for troubles.
1038 */
1039 __sk_prot_rehash(sk);
1040 return 0;
1041}
1042
1043int inet_sk_rebuild_header(struct sock *sk)
1044{
1045 struct inet_sock *inet = inet_sk(sk);
1046 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
Al Viro3ca3c682006-09-27 18:28:07 -07001047 __be32 daddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001048 int err;
1049
1050 /* Route is OK, nothing to do. */
1051 if (rt)
1052 return 0;
1053
1054 /* Reroute. */
1055 daddr = inet->daddr;
1056 if (inet->opt && inet->opt->srr)
1057 daddr = inet->opt->faddr;
1058{
1059 struct flowi fl = {
1060 .oif = sk->sk_bound_dev_if,
1061 .nl_u = {
1062 .ip4_u = {
1063 .daddr = daddr,
1064 .saddr = inet->saddr,
1065 .tos = RT_CONN_FLAGS(sk),
1066 },
1067 },
1068 .proto = sk->sk_protocol,
1069 .uli_u = {
1070 .ports = {
1071 .sport = inet->sport,
1072 .dport = inet->dport,
1073 },
1074 },
1075 };
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001076
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001077 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001078 err = ip_route_output_flow(&rt, &fl, sk, 0);
1079}
1080 if (!err)
1081 sk_setup_caps(sk, &rt->u.dst);
1082 else {
1083 /* Routing failed... */
1084 sk->sk_route_caps = 0;
1085 /*
1086 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1087 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1088 */
1089 if (!sysctl_ip_dynaddr ||
1090 sk->sk_state != TCP_SYN_SENT ||
1091 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1092 (err = inet_sk_reselect_saddr(sk)) != 0)
1093 sk->sk_err_soft = -err;
1094 }
1095
1096 return err;
1097}
1098
1099EXPORT_SYMBOL(inet_sk_rebuild_header);
1100
Herbert Xua430a432006-07-08 13:34:56 -07001101static int inet_gso_send_check(struct sk_buff *skb)
1102{
1103 struct iphdr *iph;
1104 struct net_protocol *ops;
1105 int proto;
1106 int ihl;
1107 int err = -EINVAL;
1108
1109 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1110 goto out;
1111
1112 iph = skb->nh.iph;
1113 ihl = iph->ihl * 4;
1114 if (ihl < sizeof(*iph))
1115 goto out;
1116
1117 if (unlikely(!pskb_may_pull(skb, ihl)))
1118 goto out;
1119
1120 skb->h.raw = __skb_pull(skb, ihl);
1121 iph = skb->nh.iph;
1122 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1123 err = -EPROTONOSUPPORT;
1124
1125 rcu_read_lock();
1126 ops = rcu_dereference(inet_protos[proto]);
1127 if (likely(ops && ops->gso_send_check))
1128 err = ops->gso_send_check(skb);
1129 rcu_read_unlock();
1130
1131out:
1132 return err;
1133}
1134
Herbert Xu576a30e2006-06-27 13:22:38 -07001135static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
Herbert Xuf4c50d92006-06-22 03:02:40 -07001136{
1137 struct sk_buff *segs = ERR_PTR(-EINVAL);
1138 struct iphdr *iph;
1139 struct net_protocol *ops;
1140 int proto;
1141 int ihl;
1142 int id;
1143
Herbert Xubbcf4672006-07-03 19:38:35 -07001144 if (unlikely(skb_shinfo(skb)->gso_type &
1145 ~(SKB_GSO_TCPV4 |
1146 SKB_GSO_UDP |
1147 SKB_GSO_DODGY |
1148 SKB_GSO_TCP_ECN |
1149 0)))
1150 goto out;
1151
1152 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001153 goto out;
1154
1155 iph = skb->nh.iph;
1156 ihl = iph->ihl * 4;
1157 if (ihl < sizeof(*iph))
1158 goto out;
1159
Herbert Xubbcf4672006-07-03 19:38:35 -07001160 if (unlikely(!pskb_may_pull(skb, ihl)))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001161 goto out;
1162
1163 skb->h.raw = __skb_pull(skb, ihl);
1164 iph = skb->nh.iph;
1165 id = ntohs(iph->id);
1166 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1167 segs = ERR_PTR(-EPROTONOSUPPORT);
1168
1169 rcu_read_lock();
1170 ops = rcu_dereference(inet_protos[proto]);
Herbert Xubbcf4672006-07-03 19:38:35 -07001171 if (likely(ops && ops->gso_segment))
Herbert Xu576a30e2006-06-27 13:22:38 -07001172 segs = ops->gso_segment(skb, features);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001173 rcu_read_unlock();
1174
Herbert Xu576a30e2006-06-27 13:22:38 -07001175 if (!segs || unlikely(IS_ERR(segs)))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001176 goto out;
1177
1178 skb = segs;
1179 do {
1180 iph = skb->nh.iph;
1181 iph->id = htons(id++);
1182 iph->tot_len = htons(skb->len - skb->mac_len);
1183 iph->check = 0;
1184 iph->check = ip_fast_csum(skb->nh.raw, iph->ihl);
1185 } while ((skb = skb->next));
1186
1187out:
1188 return segs;
1189}
1190
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191#ifdef CONFIG_IP_MULTICAST
1192static struct net_protocol igmp_protocol = {
1193 .handler = igmp_rcv,
1194};
1195#endif
1196
1197static struct net_protocol tcp_protocol = {
1198 .handler = tcp_v4_rcv,
1199 .err_handler = tcp_v4_err,
Herbert Xua430a432006-07-08 13:34:56 -07001200 .gso_send_check = tcp_v4_gso_send_check,
Herbert Xuf4c50d92006-06-22 03:02:40 -07001201 .gso_segment = tcp_tso_segment,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 .no_policy = 1,
1203};
1204
1205static struct net_protocol udp_protocol = {
1206 .handler = udp_rcv,
1207 .err_handler = udp_err,
1208 .no_policy = 1,
1209};
1210
1211static struct net_protocol icmp_protocol = {
1212 .handler = icmp_rcv,
1213};
1214
1215static int __init init_ipv4_mibs(void)
1216{
1217 net_statistics[0] = alloc_percpu(struct linux_mib);
1218 net_statistics[1] = alloc_percpu(struct linux_mib);
1219 ip_statistics[0] = alloc_percpu(struct ipstats_mib);
1220 ip_statistics[1] = alloc_percpu(struct ipstats_mib);
1221 icmp_statistics[0] = alloc_percpu(struct icmp_mib);
1222 icmp_statistics[1] = alloc_percpu(struct icmp_mib);
1223 tcp_statistics[0] = alloc_percpu(struct tcp_mib);
1224 tcp_statistics[1] = alloc_percpu(struct tcp_mib);
1225 udp_statistics[0] = alloc_percpu(struct udp_mib);
1226 udp_statistics[1] = alloc_percpu(struct udp_mib);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001227 udplite_statistics[0] = alloc_percpu(struct udp_mib);
1228 udplite_statistics[1] = alloc_percpu(struct udp_mib);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 if (!
1230 (net_statistics[0] && net_statistics[1] && ip_statistics[0]
1231 && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1]
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001232 && udp_statistics[0] && udp_statistics[1]
1233 && udplite_statistics[0] && udplite_statistics[1] ) )
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 return -ENOMEM;
1235
1236 (void) tcp_mib_init();
1237
1238 return 0;
1239}
1240
1241static int ipv4_proc_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242
Herbert Xu30e224d2005-07-05 14:40:10 -07001243/*
1244 * IP protocol layer initialiser
1245 */
1246
1247static struct packet_type ip_packet_type = {
1248 .type = __constant_htons(ETH_P_IP),
1249 .func = ip_rcv,
Herbert Xua430a432006-07-08 13:34:56 -07001250 .gso_send_check = inet_gso_send_check,
Herbert Xuf4c50d92006-06-22 03:02:40 -07001251 .gso_segment = inet_gso_segment,
Herbert Xu30e224d2005-07-05 14:40:10 -07001252};
1253
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254static int __init inet_init(void)
1255{
1256 struct sk_buff *dummy_skb;
1257 struct inet_protosw *q;
1258 struct list_head *r;
1259 int rc = -EINVAL;
1260
YOSHIFUJI Hideakief047f52006-09-01 00:29:06 -07001261 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262
1263 rc = proto_register(&tcp_prot, 1);
1264 if (rc)
1265 goto out;
1266
1267 rc = proto_register(&udp_prot, 1);
1268 if (rc)
1269 goto out_unregister_tcp_proto;
1270
1271 rc = proto_register(&raw_prot, 1);
1272 if (rc)
1273 goto out_unregister_udp_proto;
1274
1275 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001276 * Tell SOCKET that we are alive...
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 */
1278
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001279 (void)sock_register(&inet_family_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280
1281 /*
1282 * Add all the base protocols.
1283 */
1284
1285 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1286 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1287 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1288 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1289 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1290 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1291#ifdef CONFIG_IP_MULTICAST
1292 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1293 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1294#endif
1295
1296 /* Register the socket-side information for inet_create. */
1297 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1298 INIT_LIST_HEAD(r);
1299
1300 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1301 inet_register_protosw(q);
1302
1303 /*
1304 * Set the ARP module up
1305 */
1306
1307 arp_init();
1308
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001309 /*
1310 * Set the IP module up
1311 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312
1313 ip_init();
1314
1315 tcp_v4_init(&inet_family_ops);
1316
1317 /* Setup TCP slab cache for open requests. */
1318 tcp_init();
1319
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001320 /* Add UDP-Lite (RFC 3828) */
1321 udplite4_register();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322
1323 /*
1324 * Set the ICMP layer up
1325 */
1326
1327 icmp_init(&inet_family_ops);
1328
1329 /*
1330 * Initialise the multicast router
1331 */
1332#if defined(CONFIG_IP_MROUTE)
1333 ip_mr_init();
1334#endif
1335 /*
1336 * Initialise per-cpu ipv4 mibs
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001337 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
1339 if(init_ipv4_mibs())
1340 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001341
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 ipv4_proc_init();
1343
1344 ipfrag_init();
1345
Herbert Xu30e224d2005-07-05 14:40:10 -07001346 dev_add_pack(&ip_packet_type);
1347
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 rc = 0;
1349out:
1350 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351out_unregister_udp_proto:
1352 proto_unregister(&udp_prot);
Olaf Kirch321efff2006-09-27 16:33:45 -07001353out_unregister_tcp_proto:
1354 proto_unregister(&tcp_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 goto out;
1356}
1357
Heiko Carstensa536e072006-04-28 15:19:17 -07001358fs_initcall(inet_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
1360/* ------------------------------------------------------------------------ */
1361
1362#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363static int __init ipv4_proc_init(void)
1364{
1365 int rc = 0;
1366
1367 if (raw_proc_init())
1368 goto out_raw;
1369 if (tcp4_proc_init())
1370 goto out_tcp;
1371 if (udp4_proc_init())
1372 goto out_udp;
1373 if (fib_proc_init())
1374 goto out_fib;
1375 if (ip_misc_proc_init())
1376 goto out_misc;
1377out:
1378 return rc;
1379out_misc:
1380 fib_proc_exit();
1381out_fib:
1382 udp4_proc_exit();
1383out_udp:
1384 tcp4_proc_exit();
1385out_tcp:
1386 raw_proc_exit();
1387out_raw:
1388 rc = -ENOMEM;
1389 goto out;
1390}
1391
1392#else /* CONFIG_PROC_FS */
1393static int __init ipv4_proc_init(void)
1394{
1395 return 0;
1396}
1397#endif /* CONFIG_PROC_FS */
1398
1399MODULE_ALIAS_NETPROTO(PF_INET);
1400
1401EXPORT_SYMBOL(inet_accept);
1402EXPORT_SYMBOL(inet_bind);
1403EXPORT_SYMBOL(inet_dgram_connect);
1404EXPORT_SYMBOL(inet_dgram_ops);
1405EXPORT_SYMBOL(inet_getname);
1406EXPORT_SYMBOL(inet_ioctl);
1407EXPORT_SYMBOL(inet_listen);
1408EXPORT_SYMBOL(inet_register_protosw);
1409EXPORT_SYMBOL(inet_release);
1410EXPORT_SYMBOL(inet_sendmsg);
1411EXPORT_SYMBOL(inet_shutdown);
1412EXPORT_SYMBOL(inet_sock_destruct);
1413EXPORT_SYMBOL(inet_stream_connect);
1414EXPORT_SYMBOL(inet_stream_ops);
1415EXPORT_SYMBOL(inet_unregister_protosw);
1416EXPORT_SYMBOL(net_statistics);
Neil Hormancdac4e02005-06-13 15:12:33 -07001417EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);