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[IPV4]: Add ICMPMsgStats MIB (RFC 4293)
[deliverable/linux.git] / net / ipv4 / af_inet.c
1 /*
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 *
10 * Authors: Ross Biro
11 * 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
70 #include <linux/err.h>
71 #include <linux/errno.h>
72 #include <linux/types.h>
73 #include <linux/socket.h>
74 #include <linux/in.h>
75 #include <linux/kernel.h>
76 #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>
82 #include <linux/capability.h>
83 #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 #include <linux/random.h>
91
92 #include <asm/uaccess.h>
93 #include <asm/system.h>
94
95 #include <linux/inet.h>
96 #include <linux/igmp.h>
97 #include <linux/inetdevice.h>
98 #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>
104 #include <net/inet_connection_sock.h>
105 #include <net/tcp.h>
106 #include <net/udp.h>
107 #include <net/udplite.h>
108 #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
119 DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly;
120
121 extern 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 */
126 static struct list_head inetsw[SOCK_MAX];
127 static DEFINE_SPINLOCK(inetsw_lock);
128
129 /* New destruction routine */
130
131 void 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
153 kfree(inet->opt);
154 dst_release(sk->sk_dst_cache);
155 sk_refcnt_debug_dec(sk);
156 }
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
168 static 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 */
188 int 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) {
208 err = inet_csk_listen_start(sk, backlog);
209 if (err)
210 goto out;
211 }
212 sk->sk_max_ack_backlog = backlog;
213 err = 0;
214
215 out:
216 release_sock(sk);
217 return err;
218 }
219
220 u32 inet_ehash_secret __read_mostly;
221 EXPORT_SYMBOL(inet_ehash_secret);
222
223 /*
224 * inet_ehash_secret must be set exactly once
225 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock
226 */
227 void build_ehash_secret(void)
228 {
229 u32 rnd;
230 do {
231 get_random_bytes(&rnd, sizeof(rnd));
232 } while (rnd == 0);
233 spin_lock_bh(&inetsw_lock);
234 if (!inet_ehash_secret)
235 inet_ehash_secret = rnd;
236 spin_unlock_bh(&inetsw_lock);
237 }
238 EXPORT_SYMBOL(build_ehash_secret);
239
240 /*
241 * Create an inet socket.
242 */
243
244 static int inet_create(struct net *net, struct socket *sock, int protocol)
245 {
246 struct sock *sk;
247 struct list_head *p;
248 struct inet_protosw *answer;
249 struct inet_sock *inet;
250 struct proto *answer_prot;
251 unsigned char answer_flags;
252 char answer_no_check;
253 int try_loading_module = 0;
254 int err;
255
256 if (net != &init_net)
257 return -EAFNOSUPPORT;
258
259 if (sock->type != SOCK_RAW &&
260 sock->type != SOCK_DGRAM &&
261 !inet_ehash_secret)
262 build_ehash_secret();
263
264 sock->state = SS_UNCONNECTED;
265
266 /* Look for the requested type/protocol pair. */
267 answer = NULL;
268 lookup_protocol:
269 err = -ESOCKTNOSUPPORT;
270 rcu_read_lock();
271 list_for_each_rcu(p, &inetsw[sock->type]) {
272 answer = list_entry(p, struct inet_protosw, list);
273
274 /* Check the non-wild match. */
275 if (protocol == answer->protocol) {
276 if (protocol != IPPROTO_IP)
277 break;
278 } else {
279 /* Check for the two wild cases. */
280 if (IPPROTO_IP == protocol) {
281 protocol = answer->protocol;
282 break;
283 }
284 if (IPPROTO_IP == answer->protocol)
285 break;
286 }
287 err = -EPROTONOSUPPORT;
288 answer = NULL;
289 }
290
291 if (unlikely(answer == NULL)) {
292 if (try_loading_module < 2) {
293 rcu_read_unlock();
294 /*
295 * Be more specific, e.g. net-pf-2-proto-132-type-1
296 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
297 */
298 if (++try_loading_module == 1)
299 request_module("net-pf-%d-proto-%d-type-%d",
300 PF_INET, protocol, sock->type);
301 /*
302 * Fall back to generic, e.g. net-pf-2-proto-132
303 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
304 */
305 else
306 request_module("net-pf-%d-proto-%d",
307 PF_INET, protocol);
308 goto lookup_protocol;
309 } else
310 goto out_rcu_unlock;
311 }
312
313 err = -EPERM;
314 if (answer->capability > 0 && !capable(answer->capability))
315 goto out_rcu_unlock;
316
317 sock->ops = answer->ops;
318 answer_prot = answer->prot;
319 answer_no_check = answer->no_check;
320 answer_flags = answer->flags;
321 rcu_read_unlock();
322
323 BUG_TRAP(answer_prot->slab != NULL);
324
325 err = -ENOBUFS;
326 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, 1);
327 if (sk == NULL)
328 goto out;
329
330 err = 0;
331 sk->sk_no_check = answer_no_check;
332 if (INET_PROTOSW_REUSE & answer_flags)
333 sk->sk_reuse = 1;
334
335 inet = inet_sk(sk);
336 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
337
338 if (SOCK_RAW == sock->type) {
339 inet->num = protocol;
340 if (IPPROTO_RAW == protocol)
341 inet->hdrincl = 1;
342 }
343
344 if (ipv4_config.no_pmtu_disc)
345 inet->pmtudisc = IP_PMTUDISC_DONT;
346 else
347 inet->pmtudisc = IP_PMTUDISC_WANT;
348
349 inet->id = 0;
350
351 sock_init_data(sock, sk);
352
353 sk->sk_destruct = inet_sock_destruct;
354 sk->sk_family = PF_INET;
355 sk->sk_protocol = protocol;
356 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
357
358 inet->uc_ttl = -1;
359 inet->mc_loop = 1;
360 inet->mc_ttl = 1;
361 inet->mc_index = 0;
362 inet->mc_list = NULL;
363
364 sk_refcnt_debug_inc(sk);
365
366 if (inet->num) {
367 /* It assumes that any protocol which allows
368 * the user to assign a number at socket
369 * creation time automatically
370 * shares.
371 */
372 inet->sport = htons(inet->num);
373 /* Add to protocol hash chains. */
374 sk->sk_prot->hash(sk);
375 }
376
377 if (sk->sk_prot->init) {
378 err = sk->sk_prot->init(sk);
379 if (err)
380 sk_common_release(sk);
381 }
382 out:
383 return err;
384 out_rcu_unlock:
385 rcu_read_unlock();
386 goto out;
387 }
388
389
390 /*
391 * The peer socket should always be NULL (or else). When we call this
392 * function we are destroying the object and from then on nobody
393 * should refer to it.
394 */
395 int inet_release(struct socket *sock)
396 {
397 struct sock *sk = sock->sk;
398
399 if (sk) {
400 long timeout;
401
402 /* Applications forget to leave groups before exiting */
403 ip_mc_drop_socket(sk);
404
405 /* If linger is set, we don't return until the close
406 * is complete. Otherwise we return immediately. The
407 * actually closing is done the same either way.
408 *
409 * If the close is due to the process exiting, we never
410 * linger..
411 */
412 timeout = 0;
413 if (sock_flag(sk, SOCK_LINGER) &&
414 !(current->flags & PF_EXITING))
415 timeout = sk->sk_lingertime;
416 sock->sk = NULL;
417 sk->sk_prot->close(sk, timeout);
418 }
419 return 0;
420 }
421
422 /* It is off by default, see below. */
423 int sysctl_ip_nonlocal_bind __read_mostly;
424
425 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
426 {
427 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
428 struct sock *sk = sock->sk;
429 struct inet_sock *inet = inet_sk(sk);
430 unsigned short snum;
431 int chk_addr_ret;
432 int err;
433
434 /* If the socket has its own bind function then use it. (RAW) */
435 if (sk->sk_prot->bind) {
436 err = sk->sk_prot->bind(sk, uaddr, addr_len);
437 goto out;
438 }
439 err = -EINVAL;
440 if (addr_len < sizeof(struct sockaddr_in))
441 goto out;
442
443 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
444
445 /* Not specified by any standard per-se, however it breaks too
446 * many applications when removed. It is unfortunate since
447 * allowing applications to make a non-local bind solves
448 * several problems with systems using dynamic addressing.
449 * (ie. your servers still start up even if your ISDN link
450 * is temporarily down)
451 */
452 err = -EADDRNOTAVAIL;
453 if (!sysctl_ip_nonlocal_bind &&
454 !inet->freebind &&
455 addr->sin_addr.s_addr != INADDR_ANY &&
456 chk_addr_ret != RTN_LOCAL &&
457 chk_addr_ret != RTN_MULTICAST &&
458 chk_addr_ret != RTN_BROADCAST)
459 goto out;
460
461 snum = ntohs(addr->sin_port);
462 err = -EACCES;
463 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
464 goto out;
465
466 /* We keep a pair of addresses. rcv_saddr is the one
467 * used by hash lookups, and saddr is used for transmit.
468 *
469 * In the BSD API these are the same except where it
470 * would be illegal to use them (multicast/broadcast) in
471 * which case the sending device address is used.
472 */
473 lock_sock(sk);
474
475 /* Check these errors (active socket, double bind). */
476 err = -EINVAL;
477 if (sk->sk_state != TCP_CLOSE || inet->num)
478 goto out_release_sock;
479
480 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
481 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
482 inet->saddr = 0; /* Use device */
483
484 /* Make sure we are allowed to bind here. */
485 if (sk->sk_prot->get_port(sk, snum)) {
486 inet->saddr = inet->rcv_saddr = 0;
487 err = -EADDRINUSE;
488 goto out_release_sock;
489 }
490
491 if (inet->rcv_saddr)
492 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
493 if (snum)
494 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
495 inet->sport = htons(inet->num);
496 inet->daddr = 0;
497 inet->dport = 0;
498 sk_dst_reset(sk);
499 err = 0;
500 out_release_sock:
501 release_sock(sk);
502 out:
503 return err;
504 }
505
506 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
507 int addr_len, int flags)
508 {
509 struct sock *sk = sock->sk;
510
511 if (uaddr->sa_family == AF_UNSPEC)
512 return sk->sk_prot->disconnect(sk, flags);
513
514 if (!inet_sk(sk)->num && inet_autobind(sk))
515 return -EAGAIN;
516 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
517 }
518
519 static long inet_wait_for_connect(struct sock *sk, long timeo)
520 {
521 DEFINE_WAIT(wait);
522
523 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
524
525 /* Basic assumption: if someone sets sk->sk_err, he _must_
526 * change state of the socket from TCP_SYN_*.
527 * Connect() does not allow to get error notifications
528 * without closing the socket.
529 */
530 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
531 release_sock(sk);
532 timeo = schedule_timeout(timeo);
533 lock_sock(sk);
534 if (signal_pending(current) || !timeo)
535 break;
536 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
537 }
538 finish_wait(sk->sk_sleep, &wait);
539 return timeo;
540 }
541
542 /*
543 * Connect to a remote host. There is regrettably still a little
544 * TCP 'magic' in here.
545 */
546 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
547 int addr_len, int flags)
548 {
549 struct sock *sk = sock->sk;
550 int err;
551 long timeo;
552
553 lock_sock(sk);
554
555 if (uaddr->sa_family == AF_UNSPEC) {
556 err = sk->sk_prot->disconnect(sk, flags);
557 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
558 goto out;
559 }
560
561 switch (sock->state) {
562 default:
563 err = -EINVAL;
564 goto out;
565 case SS_CONNECTED:
566 err = -EISCONN;
567 goto out;
568 case SS_CONNECTING:
569 err = -EALREADY;
570 /* Fall out of switch with err, set for this state */
571 break;
572 case SS_UNCONNECTED:
573 err = -EISCONN;
574 if (sk->sk_state != TCP_CLOSE)
575 goto out;
576
577 err = sk->sk_prot->connect(sk, uaddr, addr_len);
578 if (err < 0)
579 goto out;
580
581 sock->state = SS_CONNECTING;
582
583 /* Just entered SS_CONNECTING state; the only
584 * difference is that return value in non-blocking
585 * case is EINPROGRESS, rather than EALREADY.
586 */
587 err = -EINPROGRESS;
588 break;
589 }
590
591 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
592
593 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
594 /* Error code is set above */
595 if (!timeo || !inet_wait_for_connect(sk, timeo))
596 goto out;
597
598 err = sock_intr_errno(timeo);
599 if (signal_pending(current))
600 goto out;
601 }
602
603 /* Connection was closed by RST, timeout, ICMP error
604 * or another process disconnected us.
605 */
606 if (sk->sk_state == TCP_CLOSE)
607 goto sock_error;
608
609 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
610 * and error was received after socket entered established state.
611 * Hence, it is handled normally after connect() return successfully.
612 */
613
614 sock->state = SS_CONNECTED;
615 err = 0;
616 out:
617 release_sock(sk);
618 return err;
619
620 sock_error:
621 err = sock_error(sk) ? : -ECONNABORTED;
622 sock->state = SS_UNCONNECTED;
623 if (sk->sk_prot->disconnect(sk, flags))
624 sock->state = SS_DISCONNECTING;
625 goto out;
626 }
627
628 /*
629 * Accept a pending connection. The TCP layer now gives BSD semantics.
630 */
631
632 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
633 {
634 struct sock *sk1 = sock->sk;
635 int err = -EINVAL;
636 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
637
638 if (!sk2)
639 goto do_err;
640
641 lock_sock(sk2);
642
643 BUG_TRAP((1 << sk2->sk_state) &
644 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE));
645
646 sock_graft(sk2, newsock);
647
648 newsock->state = SS_CONNECTED;
649 err = 0;
650 release_sock(sk2);
651 do_err:
652 return err;
653 }
654
655
656 /*
657 * This does both peername and sockname.
658 */
659 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
660 int *uaddr_len, int peer)
661 {
662 struct sock *sk = sock->sk;
663 struct inet_sock *inet = inet_sk(sk);
664 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
665
666 sin->sin_family = AF_INET;
667 if (peer) {
668 if (!inet->dport ||
669 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
670 peer == 1))
671 return -ENOTCONN;
672 sin->sin_port = inet->dport;
673 sin->sin_addr.s_addr = inet->daddr;
674 } else {
675 __be32 addr = inet->rcv_saddr;
676 if (!addr)
677 addr = inet->saddr;
678 sin->sin_port = inet->sport;
679 sin->sin_addr.s_addr = addr;
680 }
681 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
682 *uaddr_len = sizeof(*sin);
683 return 0;
684 }
685
686 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
687 size_t size)
688 {
689 struct sock *sk = sock->sk;
690
691 /* We may need to bind the socket. */
692 if (!inet_sk(sk)->num && inet_autobind(sk))
693 return -EAGAIN;
694
695 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
696 }
697
698
699 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
700 {
701 struct sock *sk = sock->sk;
702
703 /* We may need to bind the socket. */
704 if (!inet_sk(sk)->num && inet_autobind(sk))
705 return -EAGAIN;
706
707 if (sk->sk_prot->sendpage)
708 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
709 return sock_no_sendpage(sock, page, offset, size, flags);
710 }
711
712
713 int inet_shutdown(struct socket *sock, int how)
714 {
715 struct sock *sk = sock->sk;
716 int err = 0;
717
718 /* This should really check to make sure
719 * the socket is a TCP socket. (WHY AC...)
720 */
721 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
722 1->2 bit 2 snds.
723 2->3 */
724 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
725 return -EINVAL;
726
727 lock_sock(sk);
728 if (sock->state == SS_CONNECTING) {
729 if ((1 << sk->sk_state) &
730 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
731 sock->state = SS_DISCONNECTING;
732 else
733 sock->state = SS_CONNECTED;
734 }
735
736 switch (sk->sk_state) {
737 case TCP_CLOSE:
738 err = -ENOTCONN;
739 /* Hack to wake up other listeners, who can poll for
740 POLLHUP, even on eg. unconnected UDP sockets -- RR */
741 default:
742 sk->sk_shutdown |= how;
743 if (sk->sk_prot->shutdown)
744 sk->sk_prot->shutdown(sk, how);
745 break;
746
747 /* Remaining two branches are temporary solution for missing
748 * close() in multithreaded environment. It is _not_ a good idea,
749 * but we have no choice until close() is repaired at VFS level.
750 */
751 case TCP_LISTEN:
752 if (!(how & RCV_SHUTDOWN))
753 break;
754 /* Fall through */
755 case TCP_SYN_SENT:
756 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
757 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
758 break;
759 }
760
761 /* Wake up anyone sleeping in poll. */
762 sk->sk_state_change(sk);
763 release_sock(sk);
764 return err;
765 }
766
767 /*
768 * ioctl() calls you can issue on an INET socket. Most of these are
769 * device configuration and stuff and very rarely used. Some ioctls
770 * pass on to the socket itself.
771 *
772 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
773 * loads the devconfigure module does its configuring and unloads it.
774 * There's a good 20K of config code hanging around the kernel.
775 */
776
777 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
778 {
779 struct sock *sk = sock->sk;
780 int err = 0;
781
782 switch (cmd) {
783 case SIOCGSTAMP:
784 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
785 break;
786 case SIOCGSTAMPNS:
787 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
788 break;
789 case SIOCADDRT:
790 case SIOCDELRT:
791 case SIOCRTMSG:
792 err = ip_rt_ioctl(cmd, (void __user *)arg);
793 break;
794 case SIOCDARP:
795 case SIOCGARP:
796 case SIOCSARP:
797 err = arp_ioctl(cmd, (void __user *)arg);
798 break;
799 case SIOCGIFADDR:
800 case SIOCSIFADDR:
801 case SIOCGIFBRDADDR:
802 case SIOCSIFBRDADDR:
803 case SIOCGIFNETMASK:
804 case SIOCSIFNETMASK:
805 case SIOCGIFDSTADDR:
806 case SIOCSIFDSTADDR:
807 case SIOCSIFPFLAGS:
808 case SIOCGIFPFLAGS:
809 case SIOCSIFFLAGS:
810 err = devinet_ioctl(cmd, (void __user *)arg);
811 break;
812 default:
813 if (sk->sk_prot->ioctl)
814 err = sk->sk_prot->ioctl(sk, cmd, arg);
815 else
816 err = -ENOIOCTLCMD;
817 break;
818 }
819 return err;
820 }
821
822 const struct proto_ops inet_stream_ops = {
823 .family = PF_INET,
824 .owner = THIS_MODULE,
825 .release = inet_release,
826 .bind = inet_bind,
827 .connect = inet_stream_connect,
828 .socketpair = sock_no_socketpair,
829 .accept = inet_accept,
830 .getname = inet_getname,
831 .poll = tcp_poll,
832 .ioctl = inet_ioctl,
833 .listen = inet_listen,
834 .shutdown = inet_shutdown,
835 .setsockopt = sock_common_setsockopt,
836 .getsockopt = sock_common_getsockopt,
837 .sendmsg = tcp_sendmsg,
838 .recvmsg = sock_common_recvmsg,
839 .mmap = sock_no_mmap,
840 .sendpage = tcp_sendpage,
841 #ifdef CONFIG_COMPAT
842 .compat_setsockopt = compat_sock_common_setsockopt,
843 .compat_getsockopt = compat_sock_common_getsockopt,
844 #endif
845 };
846
847 const struct proto_ops inet_dgram_ops = {
848 .family = PF_INET,
849 .owner = THIS_MODULE,
850 .release = inet_release,
851 .bind = inet_bind,
852 .connect = inet_dgram_connect,
853 .socketpair = sock_no_socketpair,
854 .accept = sock_no_accept,
855 .getname = inet_getname,
856 .poll = udp_poll,
857 .ioctl = inet_ioctl,
858 .listen = sock_no_listen,
859 .shutdown = inet_shutdown,
860 .setsockopt = sock_common_setsockopt,
861 .getsockopt = sock_common_getsockopt,
862 .sendmsg = inet_sendmsg,
863 .recvmsg = sock_common_recvmsg,
864 .mmap = sock_no_mmap,
865 .sendpage = inet_sendpage,
866 #ifdef CONFIG_COMPAT
867 .compat_setsockopt = compat_sock_common_setsockopt,
868 .compat_getsockopt = compat_sock_common_getsockopt,
869 #endif
870 };
871
872 /*
873 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
874 * udp_poll
875 */
876 static const struct proto_ops inet_sockraw_ops = {
877 .family = PF_INET,
878 .owner = THIS_MODULE,
879 .release = inet_release,
880 .bind = inet_bind,
881 .connect = inet_dgram_connect,
882 .socketpair = sock_no_socketpair,
883 .accept = sock_no_accept,
884 .getname = inet_getname,
885 .poll = datagram_poll,
886 .ioctl = inet_ioctl,
887 .listen = sock_no_listen,
888 .shutdown = inet_shutdown,
889 .setsockopt = sock_common_setsockopt,
890 .getsockopt = sock_common_getsockopt,
891 .sendmsg = inet_sendmsg,
892 .recvmsg = sock_common_recvmsg,
893 .mmap = sock_no_mmap,
894 .sendpage = inet_sendpage,
895 #ifdef CONFIG_COMPAT
896 .compat_setsockopt = compat_sock_common_setsockopt,
897 .compat_getsockopt = compat_sock_common_getsockopt,
898 #endif
899 };
900
901 static struct net_proto_family inet_family_ops = {
902 .family = PF_INET,
903 .create = inet_create,
904 .owner = THIS_MODULE,
905 };
906
907 /* Upon startup we insert all the elements in inetsw_array[] into
908 * the linked list inetsw.
909 */
910 static struct inet_protosw inetsw_array[] =
911 {
912 {
913 .type = SOCK_STREAM,
914 .protocol = IPPROTO_TCP,
915 .prot = &tcp_prot,
916 .ops = &inet_stream_ops,
917 .capability = -1,
918 .no_check = 0,
919 .flags = INET_PROTOSW_PERMANENT |
920 INET_PROTOSW_ICSK,
921 },
922
923 {
924 .type = SOCK_DGRAM,
925 .protocol = IPPROTO_UDP,
926 .prot = &udp_prot,
927 .ops = &inet_dgram_ops,
928 .capability = -1,
929 .no_check = UDP_CSUM_DEFAULT,
930 .flags = INET_PROTOSW_PERMANENT,
931 },
932
933
934 {
935 .type = SOCK_RAW,
936 .protocol = IPPROTO_IP, /* wild card */
937 .prot = &raw_prot,
938 .ops = &inet_sockraw_ops,
939 .capability = CAP_NET_RAW,
940 .no_check = UDP_CSUM_DEFAULT,
941 .flags = INET_PROTOSW_REUSE,
942 }
943 };
944
945 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
946
947 void inet_register_protosw(struct inet_protosw *p)
948 {
949 struct list_head *lh;
950 struct inet_protosw *answer;
951 int protocol = p->protocol;
952 struct list_head *last_perm;
953
954 spin_lock_bh(&inetsw_lock);
955
956 if (p->type >= SOCK_MAX)
957 goto out_illegal;
958
959 /* If we are trying to override a permanent protocol, bail. */
960 answer = NULL;
961 last_perm = &inetsw[p->type];
962 list_for_each(lh, &inetsw[p->type]) {
963 answer = list_entry(lh, struct inet_protosw, list);
964
965 /* Check only the non-wild match. */
966 if (INET_PROTOSW_PERMANENT & answer->flags) {
967 if (protocol == answer->protocol)
968 break;
969 last_perm = lh;
970 }
971
972 answer = NULL;
973 }
974 if (answer)
975 goto out_permanent;
976
977 /* Add the new entry after the last permanent entry if any, so that
978 * the new entry does not override a permanent entry when matched with
979 * a wild-card protocol. But it is allowed to override any existing
980 * non-permanent entry. This means that when we remove this entry, the
981 * system automatically returns to the old behavior.
982 */
983 list_add_rcu(&p->list, last_perm);
984 out:
985 spin_unlock_bh(&inetsw_lock);
986
987 synchronize_net();
988
989 return;
990
991 out_permanent:
992 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
993 protocol);
994 goto out;
995
996 out_illegal:
997 printk(KERN_ERR
998 "Ignoring attempt to register invalid socket type %d.\n",
999 p->type);
1000 goto out;
1001 }
1002
1003 void inet_unregister_protosw(struct inet_protosw *p)
1004 {
1005 if (INET_PROTOSW_PERMANENT & p->flags) {
1006 printk(KERN_ERR
1007 "Attempt to unregister permanent protocol %d.\n",
1008 p->protocol);
1009 } else {
1010 spin_lock_bh(&inetsw_lock);
1011 list_del_rcu(&p->list);
1012 spin_unlock_bh(&inetsw_lock);
1013
1014 synchronize_net();
1015 }
1016 }
1017
1018 /*
1019 * Shall we try to damage output packets if routing dev changes?
1020 */
1021
1022 int sysctl_ip_dynaddr __read_mostly;
1023
1024 static int inet_sk_reselect_saddr(struct sock *sk)
1025 {
1026 struct inet_sock *inet = inet_sk(sk);
1027 int err;
1028 struct rtable *rt;
1029 __be32 old_saddr = inet->saddr;
1030 __be32 new_saddr;
1031 __be32 daddr = inet->daddr;
1032
1033 if (inet->opt && inet->opt->srr)
1034 daddr = inet->opt->faddr;
1035
1036 /* Query new route. */
1037 err = ip_route_connect(&rt, daddr, 0,
1038 RT_CONN_FLAGS(sk),
1039 sk->sk_bound_dev_if,
1040 sk->sk_protocol,
1041 inet->sport, inet->dport, sk, 0);
1042 if (err)
1043 return err;
1044
1045 sk_setup_caps(sk, &rt->u.dst);
1046
1047 new_saddr = rt->rt_src;
1048
1049 if (new_saddr == old_saddr)
1050 return 0;
1051
1052 if (sysctl_ip_dynaddr > 1) {
1053 printk(KERN_INFO "%s(): shifting inet->"
1054 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n",
1055 __FUNCTION__,
1056 NIPQUAD(old_saddr),
1057 NIPQUAD(new_saddr));
1058 }
1059
1060 inet->saddr = inet->rcv_saddr = new_saddr;
1061
1062 /*
1063 * XXX The only one ugly spot where we need to
1064 * XXX really change the sockets identity after
1065 * XXX it has entered the hashes. -DaveM
1066 *
1067 * Besides that, it does not check for connection
1068 * uniqueness. Wait for troubles.
1069 */
1070 __sk_prot_rehash(sk);
1071 return 0;
1072 }
1073
1074 int inet_sk_rebuild_header(struct sock *sk)
1075 {
1076 struct inet_sock *inet = inet_sk(sk);
1077 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1078 __be32 daddr;
1079 int err;
1080
1081 /* Route is OK, nothing to do. */
1082 if (rt)
1083 return 0;
1084
1085 /* Reroute. */
1086 daddr = inet->daddr;
1087 if (inet->opt && inet->opt->srr)
1088 daddr = inet->opt->faddr;
1089 {
1090 struct flowi fl = {
1091 .oif = sk->sk_bound_dev_if,
1092 .nl_u = {
1093 .ip4_u = {
1094 .daddr = daddr,
1095 .saddr = inet->saddr,
1096 .tos = RT_CONN_FLAGS(sk),
1097 },
1098 },
1099 .proto = sk->sk_protocol,
1100 .uli_u = {
1101 .ports = {
1102 .sport = inet->sport,
1103 .dport = inet->dport,
1104 },
1105 },
1106 };
1107
1108 security_sk_classify_flow(sk, &fl);
1109 err = ip_route_output_flow(&rt, &fl, sk, 0);
1110 }
1111 if (!err)
1112 sk_setup_caps(sk, &rt->u.dst);
1113 else {
1114 /* Routing failed... */
1115 sk->sk_route_caps = 0;
1116 /*
1117 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1118 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1119 */
1120 if (!sysctl_ip_dynaddr ||
1121 sk->sk_state != TCP_SYN_SENT ||
1122 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1123 (err = inet_sk_reselect_saddr(sk)) != 0)
1124 sk->sk_err_soft = -err;
1125 }
1126
1127 return err;
1128 }
1129
1130 EXPORT_SYMBOL(inet_sk_rebuild_header);
1131
1132 static int inet_gso_send_check(struct sk_buff *skb)
1133 {
1134 struct iphdr *iph;
1135 struct net_protocol *ops;
1136 int proto;
1137 int ihl;
1138 int err = -EINVAL;
1139
1140 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1141 goto out;
1142
1143 iph = ip_hdr(skb);
1144 ihl = iph->ihl * 4;
1145 if (ihl < sizeof(*iph))
1146 goto out;
1147
1148 if (unlikely(!pskb_may_pull(skb, ihl)))
1149 goto out;
1150
1151 __skb_pull(skb, ihl);
1152 skb_reset_transport_header(skb);
1153 iph = ip_hdr(skb);
1154 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1155 err = -EPROTONOSUPPORT;
1156
1157 rcu_read_lock();
1158 ops = rcu_dereference(inet_protos[proto]);
1159 if (likely(ops && ops->gso_send_check))
1160 err = ops->gso_send_check(skb);
1161 rcu_read_unlock();
1162
1163 out:
1164 return err;
1165 }
1166
1167 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
1168 {
1169 struct sk_buff *segs = ERR_PTR(-EINVAL);
1170 struct iphdr *iph;
1171 struct net_protocol *ops;
1172 int proto;
1173 int ihl;
1174 int id;
1175
1176 if (!(features & NETIF_F_V4_CSUM))
1177 features &= ~NETIF_F_SG;
1178
1179 if (unlikely(skb_shinfo(skb)->gso_type &
1180 ~(SKB_GSO_TCPV4 |
1181 SKB_GSO_UDP |
1182 SKB_GSO_DODGY |
1183 SKB_GSO_TCP_ECN |
1184 0)))
1185 goto out;
1186
1187 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1188 goto out;
1189
1190 iph = ip_hdr(skb);
1191 ihl = iph->ihl * 4;
1192 if (ihl < sizeof(*iph))
1193 goto out;
1194
1195 if (unlikely(!pskb_may_pull(skb, ihl)))
1196 goto out;
1197
1198 __skb_pull(skb, ihl);
1199 skb_reset_transport_header(skb);
1200 iph = ip_hdr(skb);
1201 id = ntohs(iph->id);
1202 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1203 segs = ERR_PTR(-EPROTONOSUPPORT);
1204
1205 rcu_read_lock();
1206 ops = rcu_dereference(inet_protos[proto]);
1207 if (likely(ops && ops->gso_segment))
1208 segs = ops->gso_segment(skb, features);
1209 rcu_read_unlock();
1210
1211 if (!segs || unlikely(IS_ERR(segs)))
1212 goto out;
1213
1214 skb = segs;
1215 do {
1216 iph = ip_hdr(skb);
1217 iph->id = htons(id++);
1218 iph->tot_len = htons(skb->len - skb->mac_len);
1219 iph->check = 0;
1220 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
1221 } while ((skb = skb->next));
1222
1223 out:
1224 return segs;
1225 }
1226
1227 unsigned long snmp_fold_field(void *mib[], int offt)
1228 {
1229 unsigned long res = 0;
1230 int i;
1231
1232 for_each_possible_cpu(i) {
1233 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
1234 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
1235 }
1236 return res;
1237 }
1238 EXPORT_SYMBOL_GPL(snmp_fold_field);
1239
1240 int snmp_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
1241 {
1242 BUG_ON(ptr == NULL);
1243 ptr[0] = __alloc_percpu(mibsize);
1244 if (!ptr[0])
1245 goto err0;
1246 ptr[1] = __alloc_percpu(mibsize);
1247 if (!ptr[1])
1248 goto err1;
1249 return 0;
1250 err1:
1251 free_percpu(ptr[0]);
1252 ptr[0] = NULL;
1253 err0:
1254 return -ENOMEM;
1255 }
1256 EXPORT_SYMBOL_GPL(snmp_mib_init);
1257
1258 void snmp_mib_free(void *ptr[2])
1259 {
1260 BUG_ON(ptr == NULL);
1261 free_percpu(ptr[0]);
1262 free_percpu(ptr[1]);
1263 ptr[0] = ptr[1] = NULL;
1264 }
1265 EXPORT_SYMBOL_GPL(snmp_mib_free);
1266
1267 #ifdef CONFIG_IP_MULTICAST
1268 static struct net_protocol igmp_protocol = {
1269 .handler = igmp_rcv,
1270 };
1271 #endif
1272
1273 static struct net_protocol tcp_protocol = {
1274 .handler = tcp_v4_rcv,
1275 .err_handler = tcp_v4_err,
1276 .gso_send_check = tcp_v4_gso_send_check,
1277 .gso_segment = tcp_tso_segment,
1278 .no_policy = 1,
1279 };
1280
1281 static struct net_protocol udp_protocol = {
1282 .handler = udp_rcv,
1283 .err_handler = udp_err,
1284 .no_policy = 1,
1285 };
1286
1287 static struct net_protocol icmp_protocol = {
1288 .handler = icmp_rcv,
1289 };
1290
1291 static int __init init_ipv4_mibs(void)
1292 {
1293 if (snmp_mib_init((void **)net_statistics,
1294 sizeof(struct linux_mib),
1295 __alignof__(struct linux_mib)) < 0)
1296 goto err_net_mib;
1297 if (snmp_mib_init((void **)ip_statistics,
1298 sizeof(struct ipstats_mib),
1299 __alignof__(struct ipstats_mib)) < 0)
1300 goto err_ip_mib;
1301 if (snmp_mib_init((void **)icmp_statistics,
1302 sizeof(struct icmp_mib),
1303 __alignof__(struct icmp_mib)) < 0)
1304 goto err_icmp_mib;
1305 if (snmp_mib_init((void **)icmpmsg_statistics,
1306 sizeof(struct icmpmsg_mib),
1307 __alignof__(struct icmpmsg_mib)) < 0)
1308 goto err_icmpmsg_mib;
1309 if (snmp_mib_init((void **)tcp_statistics,
1310 sizeof(struct tcp_mib),
1311 __alignof__(struct tcp_mib)) < 0)
1312 goto err_tcp_mib;
1313 if (snmp_mib_init((void **)udp_statistics,
1314 sizeof(struct udp_mib),
1315 __alignof__(struct udp_mib)) < 0)
1316 goto err_udp_mib;
1317 if (snmp_mib_init((void **)udplite_statistics,
1318 sizeof(struct udp_mib),
1319 __alignof__(struct udp_mib)) < 0)
1320 goto err_udplite_mib;
1321
1322 tcp_mib_init();
1323
1324 return 0;
1325
1326 err_udplite_mib:
1327 snmp_mib_free((void **)udp_statistics);
1328 err_udp_mib:
1329 snmp_mib_free((void **)tcp_statistics);
1330 err_tcp_mib:
1331 snmp_mib_free((void **)icmpmsg_statistics);
1332 err_icmpmsg_mib:
1333 snmp_mib_free((void **)icmp_statistics);
1334 err_icmp_mib:
1335 snmp_mib_free((void **)ip_statistics);
1336 err_ip_mib:
1337 snmp_mib_free((void **)net_statistics);
1338 err_net_mib:
1339 return -ENOMEM;
1340 }
1341
1342 static int ipv4_proc_init(void);
1343
1344 /*
1345 * IP protocol layer initialiser
1346 */
1347
1348 static struct packet_type ip_packet_type = {
1349 .type = __constant_htons(ETH_P_IP),
1350 .func = ip_rcv,
1351 .gso_send_check = inet_gso_send_check,
1352 .gso_segment = inet_gso_segment,
1353 };
1354
1355 static int __init inet_init(void)
1356 {
1357 struct sk_buff *dummy_skb;
1358 struct inet_protosw *q;
1359 struct list_head *r;
1360 int rc = -EINVAL;
1361
1362 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
1363
1364 rc = proto_register(&tcp_prot, 1);
1365 if (rc)
1366 goto out;
1367
1368 rc = proto_register(&udp_prot, 1);
1369 if (rc)
1370 goto out_unregister_tcp_proto;
1371
1372 rc = proto_register(&raw_prot, 1);
1373 if (rc)
1374 goto out_unregister_udp_proto;
1375
1376 /*
1377 * Tell SOCKET that we are alive...
1378 */
1379
1380 (void)sock_register(&inet_family_ops);
1381
1382 /*
1383 * Add all the base protocols.
1384 */
1385
1386 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1387 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1388 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1389 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1390 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1391 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1392 #ifdef CONFIG_IP_MULTICAST
1393 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1394 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1395 #endif
1396
1397 /* Register the socket-side information for inet_create. */
1398 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1399 INIT_LIST_HEAD(r);
1400
1401 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1402 inet_register_protosw(q);
1403
1404 /*
1405 * Set the ARP module up
1406 */
1407
1408 arp_init();
1409
1410 /*
1411 * Set the IP module up
1412 */
1413
1414 ip_init();
1415
1416 tcp_v4_init(&inet_family_ops);
1417
1418 /* Setup TCP slab cache for open requests. */
1419 tcp_init();
1420
1421 /* Add UDP-Lite (RFC 3828) */
1422 udplite4_register();
1423
1424 /*
1425 * Set the ICMP layer up
1426 */
1427
1428 icmp_init(&inet_family_ops);
1429
1430 /*
1431 * Initialise the multicast router
1432 */
1433 #if defined(CONFIG_IP_MROUTE)
1434 ip_mr_init();
1435 #endif
1436 /*
1437 * Initialise per-cpu ipv4 mibs
1438 */
1439
1440 if (init_ipv4_mibs())
1441 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ;
1442
1443 ipv4_proc_init();
1444
1445 ipfrag_init();
1446
1447 dev_add_pack(&ip_packet_type);
1448
1449 rc = 0;
1450 out:
1451 return rc;
1452 out_unregister_udp_proto:
1453 proto_unregister(&udp_prot);
1454 out_unregister_tcp_proto:
1455 proto_unregister(&tcp_prot);
1456 goto out;
1457 }
1458
1459 fs_initcall(inet_init);
1460
1461 /* ------------------------------------------------------------------------ */
1462
1463 #ifdef CONFIG_PROC_FS
1464 static int __init ipv4_proc_init(void)
1465 {
1466 int rc = 0;
1467
1468 if (raw_proc_init())
1469 goto out_raw;
1470 if (tcp4_proc_init())
1471 goto out_tcp;
1472 if (udp4_proc_init())
1473 goto out_udp;
1474 if (fib_proc_init())
1475 goto out_fib;
1476 if (ip_misc_proc_init())
1477 goto out_misc;
1478 out:
1479 return rc;
1480 out_misc:
1481 fib_proc_exit();
1482 out_fib:
1483 udp4_proc_exit();
1484 out_udp:
1485 tcp4_proc_exit();
1486 out_tcp:
1487 raw_proc_exit();
1488 out_raw:
1489 rc = -ENOMEM;
1490 goto out;
1491 }
1492
1493 #else /* CONFIG_PROC_FS */
1494 static int __init ipv4_proc_init(void)
1495 {
1496 return 0;
1497 }
1498 #endif /* CONFIG_PROC_FS */
1499
1500 MODULE_ALIAS_NETPROTO(PF_INET);
1501
1502 EXPORT_SYMBOL(inet_accept);
1503 EXPORT_SYMBOL(inet_bind);
1504 EXPORT_SYMBOL(inet_dgram_connect);
1505 EXPORT_SYMBOL(inet_dgram_ops);
1506 EXPORT_SYMBOL(inet_getname);
1507 EXPORT_SYMBOL(inet_ioctl);
1508 EXPORT_SYMBOL(inet_listen);
1509 EXPORT_SYMBOL(inet_register_protosw);
1510 EXPORT_SYMBOL(inet_release);
1511 EXPORT_SYMBOL(inet_sendmsg);
1512 EXPORT_SYMBOL(inet_shutdown);
1513 EXPORT_SYMBOL(inet_sock_destruct);
1514 EXPORT_SYMBOL(inet_stream_connect);
1515 EXPORT_SYMBOL(inet_stream_ops);
1516 EXPORT_SYMBOL(inet_unregister_protosw);
1517 EXPORT_SYMBOL(net_statistics);
1518 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
Linux kernel - Deliverables
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