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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv4/af_inet.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/ipv4/af_inet.c')
-rw-r--r--net/ipv4/af_inet.c1188
1 files changed, 1188 insertions, 0 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
new file mode 100644
index 000000000000..c34dab67e461
--- /dev/null
+++ b/net/ipv4/af_inet.c
@@ -0,0 +1,1188 @@
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, <bir7@leland.Stanford.Edu>
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/config.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/major.h>
77#include <linux/module.h>
78#include <linux/sched.h>
79#include <linux/timer.h>
80#include <linux/string.h>
81#include <linux/sockios.h>
82#include <linux/net.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
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>
97#include <linux/netdevice.h>
98#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>
103#include <net/tcp.h>
104#include <net/udp.h>
105#include <linux/skbuff.h>
106#include <net/sock.h>
107#include <net/raw.h>
108#include <net/icmp.h>
109#include <net/ipip.h>
110#include <net/inet_common.h>
111#include <net/xfrm.h>
112#ifdef CONFIG_IP_MROUTE
113#include <linux/mroute.h>
114#endif
115
116DEFINE_SNMP_STAT(struct linux_mib, net_statistics);
117
118#ifdef INET_REFCNT_DEBUG
119atomic_t inet_sock_nr;
120#endif
121
122extern void ip_mc_drop_socket(struct sock *sk);
123
124/* The inetsw table contains everything that inet_create needs to
125 * build a new socket.
126 */
127static struct list_head inetsw[SOCK_MAX];
128static DEFINE_SPINLOCK(inetsw_lock);
129
130/* 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
139 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
140 printk("Attempt to release TCP socket in state %d %p\n",
141 sk->sk_state, sk);
142 return;
143 }
144 if (!sock_flag(sk, SOCK_DEAD)) {
145 printk("Attempt to release alive inet socket %p\n", sk);
146 return;
147 }
148
149 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
150 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
151 BUG_TRAP(!sk->sk_wmem_queued);
152 BUG_TRAP(!sk->sk_forward_alloc);
153
154 if (inet->opt)
155 kfree(inet->opt);
156 dst_release(sk->sk_dst_cache);
157#ifdef INET_REFCNT_DEBUG
158 atomic_dec(&inet_sock_nr);
159 printk(KERN_DEBUG "INET socket %p released, %d are still alive\n",
160 sk, atomic_read(&inet_sock_nr));
161#endif
162}
163
164/*
165 * The routines beyond this point handle the behaviour of an AF_INET
166 * socket object. Mostly it punts to the subprotocols of IP to do
167 * the work.
168 */
169
170/*
171 * Automatically bind an unbound socket.
172 */
173
174static int inet_autobind(struct sock *sk)
175{
176 struct inet_sock *inet;
177 /* We may need to bind the socket. */
178 lock_sock(sk);
179 inet = inet_sk(sk);
180 if (!inet->num) {
181 if (sk->sk_prot->get_port(sk, 0)) {
182 release_sock(sk);
183 return -EAGAIN;
184 }
185 inet->sport = htons(inet->num);
186 }
187 release_sock(sk);
188 return 0;
189}
190
191/*
192 * Move a socket into listening state.
193 */
194int inet_listen(struct socket *sock, int backlog)
195{
196 struct sock *sk = sock->sk;
197 unsigned char old_state;
198 int err;
199
200 lock_sock(sk);
201
202 err = -EINVAL;
203 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
204 goto out;
205
206 old_state = sk->sk_state;
207 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
208 goto out;
209
210 /* Really, if the socket is already in listen state
211 * we can only allow the backlog to be adjusted.
212 */
213 if (old_state != TCP_LISTEN) {
214 err = tcp_listen_start(sk);
215 if (err)
216 goto out;
217 }
218 sk->sk_max_ack_backlog = backlog;
219 err = 0;
220
221out:
222 release_sock(sk);
223 return err;
224}
225
226/*
227 * Create an inet socket.
228 */
229
230static int inet_create(struct socket *sock, int protocol)
231{
232 struct sock *sk;
233 struct list_head *p;
234 struct inet_protosw *answer;
235 struct inet_sock *inet;
236 struct proto *answer_prot;
237 unsigned char answer_flags;
238 char answer_no_check;
239 int err;
240
241 sock->state = SS_UNCONNECTED;
242
243 /* Look for the requested type/protocol pair. */
244 answer = NULL;
245 rcu_read_lock();
246 list_for_each_rcu(p, &inetsw[sock->type]) {
247 answer = list_entry(p, struct inet_protosw, list);
248
249 /* Check the non-wild match. */
250 if (protocol == answer->protocol) {
251 if (protocol != IPPROTO_IP)
252 break;
253 } else {
254 /* Check for the two wild cases. */
255 if (IPPROTO_IP == protocol) {
256 protocol = answer->protocol;
257 break;
258 }
259 if (IPPROTO_IP == answer->protocol)
260 break;
261 }
262 answer = NULL;
263 }
264
265 err = -ESOCKTNOSUPPORT;
266 if (!answer)
267 goto out_rcu_unlock;
268 err = -EPERM;
269 if (answer->capability > 0 && !capable(answer->capability))
270 goto out_rcu_unlock;
271 err = -EPROTONOSUPPORT;
272 if (!protocol)
273 goto out_rcu_unlock;
274
275 sock->ops = answer->ops;
276 answer_prot = answer->prot;
277 answer_no_check = answer->no_check;
278 answer_flags = answer->flags;
279 rcu_read_unlock();
280
281 BUG_TRAP(answer_prot->slab != NULL);
282
283 err = -ENOBUFS;
284 sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1);
285 if (sk == NULL)
286 goto out;
287
288 err = 0;
289 sk->sk_no_check = answer_no_check;
290 if (INET_PROTOSW_REUSE & answer_flags)
291 sk->sk_reuse = 1;
292
293 inet = inet_sk(sk);
294
295 if (SOCK_RAW == sock->type) {
296 inet->num = protocol;
297 if (IPPROTO_RAW == protocol)
298 inet->hdrincl = 1;
299 }
300
301 if (ipv4_config.no_pmtu_disc)
302 inet->pmtudisc = IP_PMTUDISC_DONT;
303 else
304 inet->pmtudisc = IP_PMTUDISC_WANT;
305
306 inet->id = 0;
307
308 sock_init_data(sock, sk);
309
310 sk->sk_destruct = inet_sock_destruct;
311 sk->sk_family = PF_INET;
312 sk->sk_protocol = protocol;
313 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
314
315 inet->uc_ttl = -1;
316 inet->mc_loop = 1;
317 inet->mc_ttl = 1;
318 inet->mc_index = 0;
319 inet->mc_list = NULL;
320
321#ifdef INET_REFCNT_DEBUG
322 atomic_inc(&inet_sock_nr);
323#endif
324
325 if (inet->num) {
326 /* It assumes that any protocol which allows
327 * the user to assign a number at socket
328 * creation time automatically
329 * shares.
330 */
331 inet->sport = htons(inet->num);
332 /* Add to protocol hash chains. */
333 sk->sk_prot->hash(sk);
334 }
335
336 if (sk->sk_prot->init) {
337 err = sk->sk_prot->init(sk);
338 if (err)
339 sk_common_release(sk);
340 }
341out:
342 return err;
343out_rcu_unlock:
344 rcu_read_unlock();
345 goto out;
346}
347
348
349/*
350 * The peer socket should always be NULL (or else). When we call this
351 * function we are destroying the object and from then on nobody
352 * should refer to it.
353 */
354int inet_release(struct socket *sock)
355{
356 struct sock *sk = sock->sk;
357
358 if (sk) {
359 long timeout;
360
361 /* Applications forget to leave groups before exiting */
362 ip_mc_drop_socket(sk);
363
364 /* If linger is set, we don't return until the close
365 * is complete. Otherwise we return immediately. The
366 * actually closing is done the same either way.
367 *
368 * If the close is due to the process exiting, we never
369 * linger..
370 */
371 timeout = 0;
372 if (sock_flag(sk, SOCK_LINGER) &&
373 !(current->flags & PF_EXITING))
374 timeout = sk->sk_lingertime;
375 sock->sk = NULL;
376 sk->sk_prot->close(sk, timeout);
377 }
378 return 0;
379}
380
381/* It is off by default, see below. */
382int sysctl_ip_nonlocal_bind;
383
384int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
385{
386 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
387 struct sock *sk = sock->sk;
388 struct inet_sock *inet = inet_sk(sk);
389 unsigned short snum;
390 int chk_addr_ret;
391 int err;
392
393 /* If the socket has its own bind function then use it. (RAW) */
394 if (sk->sk_prot->bind) {
395 err = sk->sk_prot->bind(sk, uaddr, addr_len);
396 goto out;
397 }
398 err = -EINVAL;
399 if (addr_len < sizeof(struct sockaddr_in))
400 goto out;
401
402 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
403
404 /* Not specified by any standard per-se, however it breaks too
405 * many applications when removed. It is unfortunate since
406 * allowing applications to make a non-local bind solves
407 * several problems with systems using dynamic addressing.
408 * (ie. your servers still start up even if your ISDN link
409 * is temporarily down)
410 */
411 err = -EADDRNOTAVAIL;
412 if (!sysctl_ip_nonlocal_bind &&
413 !inet->freebind &&
414 addr->sin_addr.s_addr != INADDR_ANY &&
415 chk_addr_ret != RTN_LOCAL &&
416 chk_addr_ret != RTN_MULTICAST &&
417 chk_addr_ret != RTN_BROADCAST)
418 goto out;
419
420 snum = ntohs(addr->sin_port);
421 err = -EACCES;
422 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
423 goto out;
424
425 /* We keep a pair of addresses. rcv_saddr is the one
426 * used by hash lookups, and saddr is used for transmit.
427 *
428 * In the BSD API these are the same except where it
429 * would be illegal to use them (multicast/broadcast) in
430 * which case the sending device address is used.
431 */
432 lock_sock(sk);
433
434 /* Check these errors (active socket, double bind). */
435 err = -EINVAL;
436 if (sk->sk_state != TCP_CLOSE || inet->num)
437 goto out_release_sock;
438
439 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
440 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
441 inet->saddr = 0; /* Use device */
442
443 /* Make sure we are allowed to bind here. */
444 if (sk->sk_prot->get_port(sk, snum)) {
445 inet->saddr = inet->rcv_saddr = 0;
446 err = -EADDRINUSE;
447 goto out_release_sock;
448 }
449
450 if (inet->rcv_saddr)
451 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
452 if (snum)
453 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
454 inet->sport = htons(inet->num);
455 inet->daddr = 0;
456 inet->dport = 0;
457 sk_dst_reset(sk);
458 err = 0;
459out_release_sock:
460 release_sock(sk);
461out:
462 return err;
463}
464
465int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
466 int addr_len, int flags)
467{
468 struct sock *sk = sock->sk;
469
470 if (uaddr->sa_family == AF_UNSPEC)
471 return sk->sk_prot->disconnect(sk, flags);
472
473 if (!inet_sk(sk)->num && inet_autobind(sk))
474 return -EAGAIN;
475 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
476}
477
478static long inet_wait_for_connect(struct sock *sk, long timeo)
479{
480 DEFINE_WAIT(wait);
481
482 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
483
484 /* Basic assumption: if someone sets sk->sk_err, he _must_
485 * change state of the socket from TCP_SYN_*.
486 * Connect() does not allow to get error notifications
487 * without closing the socket.
488 */
489 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
490 release_sock(sk);
491 timeo = schedule_timeout(timeo);
492 lock_sock(sk);
493 if (signal_pending(current) || !timeo)
494 break;
495 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
496 }
497 finish_wait(sk->sk_sleep, &wait);
498 return timeo;
499}
500
501/*
502 * Connect to a remote host. There is regrettably still a little
503 * TCP 'magic' in here.
504 */
505int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
506 int addr_len, int flags)
507{
508 struct sock *sk = sock->sk;
509 int err;
510 long timeo;
511
512 lock_sock(sk);
513
514 if (uaddr->sa_family == AF_UNSPEC) {
515 err = sk->sk_prot->disconnect(sk, flags);
516 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
517 goto out;
518 }
519
520 switch (sock->state) {
521 default:
522 err = -EINVAL;
523 goto out;
524 case SS_CONNECTED:
525 err = -EISCONN;
526 goto out;
527 case SS_CONNECTING:
528 err = -EALREADY;
529 /* Fall out of switch with err, set for this state */
530 break;
531 case SS_UNCONNECTED:
532 err = -EISCONN;
533 if (sk->sk_state != TCP_CLOSE)
534 goto out;
535
536 err = sk->sk_prot->connect(sk, uaddr, addr_len);
537 if (err < 0)
538 goto out;
539
540 sock->state = SS_CONNECTING;
541
542 /* Just entered SS_CONNECTING state; the only
543 * difference is that return value in non-blocking
544 * case is EINPROGRESS, rather than EALREADY.
545 */
546 err = -EINPROGRESS;
547 break;
548 }
549
550 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
551
552 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
553 /* Error code is set above */
554 if (!timeo || !inet_wait_for_connect(sk, timeo))
555 goto out;
556
557 err = sock_intr_errno(timeo);
558 if (signal_pending(current))
559 goto out;
560 }
561
562 /* Connection was closed by RST, timeout, ICMP error
563 * or another process disconnected us.
564 */
565 if (sk->sk_state == TCP_CLOSE)
566 goto sock_error;
567
568 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
569 * and error was received after socket entered established state.
570 * Hence, it is handled normally after connect() return successfully.
571 */
572
573 sock->state = SS_CONNECTED;
574 err = 0;
575out:
576 release_sock(sk);
577 return err;
578
579sock_error:
580 err = sock_error(sk) ? : -ECONNABORTED;
581 sock->state = SS_UNCONNECTED;
582 if (sk->sk_prot->disconnect(sk, flags))
583 sock->state = SS_DISCONNECTING;
584 goto out;
585}
586
587/*
588 * Accept a pending connection. The TCP layer now gives BSD semantics.
589 */
590
591int inet_accept(struct socket *sock, struct socket *newsock, int flags)
592{
593 struct sock *sk1 = sock->sk;
594 int err = -EINVAL;
595 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
596
597 if (!sk2)
598 goto do_err;
599
600 lock_sock(sk2);
601
602 BUG_TRAP((1 << sk2->sk_state) &
603 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE));
604
605 sock_graft(sk2, newsock);
606
607 newsock->state = SS_CONNECTED;
608 err = 0;
609 release_sock(sk2);
610do_err:
611 return err;
612}
613
614
615/*
616 * This does both peername and sockname.
617 */
618int inet_getname(struct socket *sock, struct sockaddr *uaddr,
619 int *uaddr_len, int peer)
620{
621 struct sock *sk = sock->sk;
622 struct inet_sock *inet = inet_sk(sk);
623 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
624
625 sin->sin_family = AF_INET;
626 if (peer) {
627 if (!inet->dport ||
628 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
629 peer == 1))
630 return -ENOTCONN;
631 sin->sin_port = inet->dport;
632 sin->sin_addr.s_addr = inet->daddr;
633 } else {
634 __u32 addr = inet->rcv_saddr;
635 if (!addr)
636 addr = inet->saddr;
637 sin->sin_port = inet->sport;
638 sin->sin_addr.s_addr = addr;
639 }
640 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
641 *uaddr_len = sizeof(*sin);
642 return 0;
643}
644
645int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
646 size_t size)
647{
648 struct sock *sk = sock->sk;
649
650 /* We may need to bind the socket. */
651 if (!inet_sk(sk)->num && inet_autobind(sk))
652 return -EAGAIN;
653
654 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
655}
656
657
658static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
659{
660 struct sock *sk = sock->sk;
661
662 /* We may need to bind the socket. */
663 if (!inet_sk(sk)->num && inet_autobind(sk))
664 return -EAGAIN;
665
666 if (sk->sk_prot->sendpage)
667 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
668 return sock_no_sendpage(sock, page, offset, size, flags);
669}
670
671
672int inet_shutdown(struct socket *sock, int how)
673{
674 struct sock *sk = sock->sk;
675 int err = 0;
676
677 /* This should really check to make sure
678 * the socket is a TCP socket. (WHY AC...)
679 */
680 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
681 1->2 bit 2 snds.
682 2->3 */
683 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
684 return -EINVAL;
685
686 lock_sock(sk);
687 if (sock->state == SS_CONNECTING) {
688 if ((1 << sk->sk_state) &
689 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
690 sock->state = SS_DISCONNECTING;
691 else
692 sock->state = SS_CONNECTED;
693 }
694
695 switch (sk->sk_state) {
696 case TCP_CLOSE:
697 err = -ENOTCONN;
698 /* Hack to wake up other listeners, who can poll for
699 POLLHUP, even on eg. unconnected UDP sockets -- RR */
700 default:
701 sk->sk_shutdown |= how;
702 if (sk->sk_prot->shutdown)
703 sk->sk_prot->shutdown(sk, how);
704 break;
705
706 /* Remaining two branches are temporary solution for missing
707 * close() in multithreaded environment. It is _not_ a good idea,
708 * but we have no choice until close() is repaired at VFS level.
709 */
710 case TCP_LISTEN:
711 if (!(how & RCV_SHUTDOWN))
712 break;
713 /* Fall through */
714 case TCP_SYN_SENT:
715 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
716 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
717 break;
718 }
719
720 /* Wake up anyone sleeping in poll. */
721 sk->sk_state_change(sk);
722 release_sock(sk);
723 return err;
724}
725
726/*
727 * ioctl() calls you can issue on an INET socket. Most of these are
728 * device configuration and stuff and very rarely used. Some ioctls
729 * pass on to the socket itself.
730 *
731 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
732 * loads the devconfigure module does its configuring and unloads it.
733 * There's a good 20K of config code hanging around the kernel.
734 */
735
736int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
737{
738 struct sock *sk = sock->sk;
739 int err = 0;
740
741 switch (cmd) {
742 case SIOCGSTAMP:
743 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
744 break;
745 case SIOCADDRT:
746 case SIOCDELRT:
747 case SIOCRTMSG:
748 err = ip_rt_ioctl(cmd, (void __user *)arg);
749 break;
750 case SIOCDARP:
751 case SIOCGARP:
752 case SIOCSARP:
753 err = arp_ioctl(cmd, (void __user *)arg);
754 break;
755 case SIOCGIFADDR:
756 case SIOCSIFADDR:
757 case SIOCGIFBRDADDR:
758 case SIOCSIFBRDADDR:
759 case SIOCGIFNETMASK:
760 case SIOCSIFNETMASK:
761 case SIOCGIFDSTADDR:
762 case SIOCSIFDSTADDR:
763 case SIOCSIFPFLAGS:
764 case SIOCGIFPFLAGS:
765 case SIOCSIFFLAGS:
766 err = devinet_ioctl(cmd, (void __user *)arg);
767 break;
768 default:
769 if (!sk->sk_prot->ioctl ||
770 (err = sk->sk_prot->ioctl(sk, cmd, arg)) ==
771 -ENOIOCTLCMD)
772 err = dev_ioctl(cmd, (void __user *)arg);
773 break;
774 }
775 return err;
776}
777
778struct proto_ops inet_stream_ops = {
779 .family = PF_INET,
780 .owner = THIS_MODULE,
781 .release = inet_release,
782 .bind = inet_bind,
783 .connect = inet_stream_connect,
784 .socketpair = sock_no_socketpair,
785 .accept = inet_accept,
786 .getname = inet_getname,
787 .poll = tcp_poll,
788 .ioctl = inet_ioctl,
789 .listen = inet_listen,
790 .shutdown = inet_shutdown,
791 .setsockopt = sock_common_setsockopt,
792 .getsockopt = sock_common_getsockopt,
793 .sendmsg = inet_sendmsg,
794 .recvmsg = sock_common_recvmsg,
795 .mmap = sock_no_mmap,
796 .sendpage = tcp_sendpage
797};
798
799struct proto_ops inet_dgram_ops = {
800 .family = PF_INET,
801 .owner = THIS_MODULE,
802 .release = inet_release,
803 .bind = inet_bind,
804 .connect = inet_dgram_connect,
805 .socketpair = sock_no_socketpair,
806 .accept = sock_no_accept,
807 .getname = inet_getname,
808 .poll = udp_poll,
809 .ioctl = inet_ioctl,
810 .listen = sock_no_listen,
811 .shutdown = inet_shutdown,
812 .setsockopt = sock_common_setsockopt,
813 .getsockopt = sock_common_getsockopt,
814 .sendmsg = inet_sendmsg,
815 .recvmsg = sock_common_recvmsg,
816 .mmap = sock_no_mmap,
817 .sendpage = inet_sendpage,
818};
819
820/*
821 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
822 * udp_poll
823 */
824static struct proto_ops inet_sockraw_ops = {
825 .family = PF_INET,
826 .owner = THIS_MODULE,
827 .release = inet_release,
828 .bind = inet_bind,
829 .connect = inet_dgram_connect,
830 .socketpair = sock_no_socketpair,
831 .accept = sock_no_accept,
832 .getname = inet_getname,
833 .poll = datagram_poll,
834 .ioctl = inet_ioctl,
835 .listen = sock_no_listen,
836 .shutdown = inet_shutdown,
837 .setsockopt = sock_common_setsockopt,
838 .getsockopt = sock_common_getsockopt,
839 .sendmsg = inet_sendmsg,
840 .recvmsg = sock_common_recvmsg,
841 .mmap = sock_no_mmap,
842 .sendpage = inet_sendpage,
843};
844
845static struct net_proto_family inet_family_ops = {
846 .family = PF_INET,
847 .create = inet_create,
848 .owner = THIS_MODULE,
849};
850
851
852extern void tcp_init(void);
853extern void tcp_v4_init(struct net_proto_family *);
854
855/* Upon startup we insert all the elements in inetsw_array[] into
856 * the linked list inetsw.
857 */
858static struct inet_protosw inetsw_array[] =
859{
860 {
861 .type = SOCK_STREAM,
862 .protocol = IPPROTO_TCP,
863 .prot = &tcp_prot,
864 .ops = &inet_stream_ops,
865 .capability = -1,
866 .no_check = 0,
867 .flags = INET_PROTOSW_PERMANENT,
868 },
869
870 {
871 .type = SOCK_DGRAM,
872 .protocol = IPPROTO_UDP,
873 .prot = &udp_prot,
874 .ops = &inet_dgram_ops,
875 .capability = -1,
876 .no_check = UDP_CSUM_DEFAULT,
877 .flags = INET_PROTOSW_PERMANENT,
878 },
879
880
881 {
882 .type = SOCK_RAW,
883 .protocol = IPPROTO_IP, /* wild card */
884 .prot = &raw_prot,
885 .ops = &inet_sockraw_ops,
886 .capability = CAP_NET_RAW,
887 .no_check = UDP_CSUM_DEFAULT,
888 .flags = INET_PROTOSW_REUSE,
889 }
890};
891
892#define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw))
893
894void inet_register_protosw(struct inet_protosw *p)
895{
896 struct list_head *lh;
897 struct inet_protosw *answer;
898 int protocol = p->protocol;
899 struct list_head *last_perm;
900
901 spin_lock_bh(&inetsw_lock);
902
903 if (p->type >= SOCK_MAX)
904 goto out_illegal;
905
906 /* If we are trying to override a permanent protocol, bail. */
907 answer = NULL;
908 last_perm = &inetsw[p->type];
909 list_for_each(lh, &inetsw[p->type]) {
910 answer = list_entry(lh, struct inet_protosw, list);
911
912 /* Check only the non-wild match. */
913 if (INET_PROTOSW_PERMANENT & answer->flags) {
914 if (protocol == answer->protocol)
915 break;
916 last_perm = lh;
917 }
918
919 answer = NULL;
920 }
921 if (answer)
922 goto out_permanent;
923
924 /* Add the new entry after the last permanent entry if any, so that
925 * the new entry does not override a permanent entry when matched with
926 * a wild-card protocol. But it is allowed to override any existing
927 * non-permanent entry. This means that when we remove this entry, the
928 * system automatically returns to the old behavior.
929 */
930 list_add_rcu(&p->list, last_perm);
931out:
932 spin_unlock_bh(&inetsw_lock);
933
934 synchronize_net();
935
936 return;
937
938out_permanent:
939 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
940 protocol);
941 goto out;
942
943out_illegal:
944 printk(KERN_ERR
945 "Ignoring attempt to register invalid socket type %d.\n",
946 p->type);
947 goto out;
948}
949
950void inet_unregister_protosw(struct inet_protosw *p)
951{
952 if (INET_PROTOSW_PERMANENT & p->flags) {
953 printk(KERN_ERR
954 "Attempt to unregister permanent protocol %d.\n",
955 p->protocol);
956 } else {
957 spin_lock_bh(&inetsw_lock);
958 list_del_rcu(&p->list);
959 spin_unlock_bh(&inetsw_lock);
960
961 synchronize_net();
962 }
963}
964
965#ifdef CONFIG_IP_MULTICAST
966static struct net_protocol igmp_protocol = {
967 .handler = igmp_rcv,
968};
969#endif
970
971static struct net_protocol tcp_protocol = {
972 .handler = tcp_v4_rcv,
973 .err_handler = tcp_v4_err,
974 .no_policy = 1,
975};
976
977static struct net_protocol udp_protocol = {
978 .handler = udp_rcv,
979 .err_handler = udp_err,
980 .no_policy = 1,
981};
982
983static struct net_protocol icmp_protocol = {
984 .handler = icmp_rcv,
985};
986
987static int __init init_ipv4_mibs(void)
988{
989 net_statistics[0] = alloc_percpu(struct linux_mib);
990 net_statistics[1] = alloc_percpu(struct linux_mib);
991 ip_statistics[0] = alloc_percpu(struct ipstats_mib);
992 ip_statistics[1] = alloc_percpu(struct ipstats_mib);
993 icmp_statistics[0] = alloc_percpu(struct icmp_mib);
994 icmp_statistics[1] = alloc_percpu(struct icmp_mib);
995 tcp_statistics[0] = alloc_percpu(struct tcp_mib);
996 tcp_statistics[1] = alloc_percpu(struct tcp_mib);
997 udp_statistics[0] = alloc_percpu(struct udp_mib);
998 udp_statistics[1] = alloc_percpu(struct udp_mib);
999 if (!
1000 (net_statistics[0] && net_statistics[1] && ip_statistics[0]
1001 && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1]
1002 && udp_statistics[0] && udp_statistics[1]))
1003 return -ENOMEM;
1004
1005 (void) tcp_mib_init();
1006
1007 return 0;
1008}
1009
1010static int ipv4_proc_init(void);
1011extern void ipfrag_init(void);
1012
1013static int __init inet_init(void)
1014{
1015 struct sk_buff *dummy_skb;
1016 struct inet_protosw *q;
1017 struct list_head *r;
1018 int rc = -EINVAL;
1019
1020 if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) {
1021 printk(KERN_CRIT "%s: panic\n", __FUNCTION__);
1022 goto out;
1023 }
1024
1025 rc = proto_register(&tcp_prot, 1);
1026 if (rc)
1027 goto out;
1028
1029 rc = proto_register(&udp_prot, 1);
1030 if (rc)
1031 goto out_unregister_tcp_proto;
1032
1033 rc = proto_register(&raw_prot, 1);
1034 if (rc)
1035 goto out_unregister_udp_proto;
1036
1037 /*
1038 * Tell SOCKET that we are alive...
1039 */
1040
1041 (void)sock_register(&inet_family_ops);
1042
1043 /*
1044 * Add all the base protocols.
1045 */
1046
1047 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1048 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1049 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1050 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1051 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1052 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1053#ifdef CONFIG_IP_MULTICAST
1054 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1055 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1056#endif
1057
1058 /* Register the socket-side information for inet_create. */
1059 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1060 INIT_LIST_HEAD(r);
1061
1062 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1063 inet_register_protosw(q);
1064
1065 /*
1066 * Set the ARP module up
1067 */
1068
1069 arp_init();
1070
1071 /*
1072 * Set the IP module up
1073 */
1074
1075 ip_init();
1076
1077 tcp_v4_init(&inet_family_ops);
1078
1079 /* Setup TCP slab cache for open requests. */
1080 tcp_init();
1081
1082
1083 /*
1084 * Set the ICMP layer up
1085 */
1086
1087 icmp_init(&inet_family_ops);
1088
1089 /*
1090 * Initialise the multicast router
1091 */
1092#if defined(CONFIG_IP_MROUTE)
1093 ip_mr_init();
1094#endif
1095 /*
1096 * Initialise per-cpu ipv4 mibs
1097 */
1098
1099 if(init_ipv4_mibs())
1100 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ;
1101
1102 ipv4_proc_init();
1103
1104 ipfrag_init();
1105
1106 rc = 0;
1107out:
1108 return rc;
1109out_unregister_tcp_proto:
1110 proto_unregister(&tcp_prot);
1111out_unregister_udp_proto:
1112 proto_unregister(&udp_prot);
1113 goto out;
1114}
1115
1116module_init(inet_init);
1117
1118/* ------------------------------------------------------------------------ */
1119
1120#ifdef CONFIG_PROC_FS
1121extern int fib_proc_init(void);
1122extern void fib_proc_exit(void);
1123extern int ip_misc_proc_init(void);
1124extern int raw_proc_init(void);
1125extern void raw_proc_exit(void);
1126extern int tcp4_proc_init(void);
1127extern void tcp4_proc_exit(void);
1128extern int udp4_proc_init(void);
1129extern void udp4_proc_exit(void);
1130
1131static int __init ipv4_proc_init(void)
1132{
1133 int rc = 0;
1134
1135 if (raw_proc_init())
1136 goto out_raw;
1137 if (tcp4_proc_init())
1138 goto out_tcp;
1139 if (udp4_proc_init())
1140 goto out_udp;
1141 if (fib_proc_init())
1142 goto out_fib;
1143 if (ip_misc_proc_init())
1144 goto out_misc;
1145out:
1146 return rc;
1147out_misc:
1148 fib_proc_exit();
1149out_fib:
1150 udp4_proc_exit();
1151out_udp:
1152 tcp4_proc_exit();
1153out_tcp:
1154 raw_proc_exit();
1155out_raw:
1156 rc = -ENOMEM;
1157 goto out;
1158}
1159
1160#else /* CONFIG_PROC_FS */
1161static int __init ipv4_proc_init(void)
1162{
1163 return 0;
1164}
1165#endif /* CONFIG_PROC_FS */
1166
1167MODULE_ALIAS_NETPROTO(PF_INET);
1168
1169EXPORT_SYMBOL(inet_accept);
1170EXPORT_SYMBOL(inet_bind);
1171EXPORT_SYMBOL(inet_dgram_connect);
1172EXPORT_SYMBOL(inet_dgram_ops);
1173EXPORT_SYMBOL(inet_getname);
1174EXPORT_SYMBOL(inet_ioctl);
1175EXPORT_SYMBOL(inet_listen);
1176EXPORT_SYMBOL(inet_register_protosw);
1177EXPORT_SYMBOL(inet_release);
1178EXPORT_SYMBOL(inet_sendmsg);
1179EXPORT_SYMBOL(inet_shutdown);
1180EXPORT_SYMBOL(inet_sock_destruct);
1181EXPORT_SYMBOL(inet_stream_connect);
1182EXPORT_SYMBOL(inet_stream_ops);
1183EXPORT_SYMBOL(inet_unregister_protosw);
1184EXPORT_SYMBOL(net_statistics);
1185
1186#ifdef INET_REFCNT_DEBUG
1187EXPORT_SYMBOL(inet_sock_nr);
1188#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 15:38:08 -0500