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Commit | Line | Data |
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1da177e4 LT |
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 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
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> | |
1da177e4 LT |
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/fcntl.h> | |
83 | #include <linux/mm.h> | |
84 | #include <linux/interrupt.h> | |
85 | #include <linux/stat.h> | |
86 | #include <linux/init.h> | |
87 | #include <linux/poll.h> | |
88 | #include <linux/netfilter_ipv4.h> | |
89 | ||
90 | #include <asm/uaccess.h> | |
91 | #include <asm/system.h> | |
92 | ||
93 | #include <linux/smp_lock.h> | |
94 | #include <linux/inet.h> | |
95 | #include <linux/igmp.h> | |
96 | #include <linux/netdevice.h> | |
97 | #include <net/ip.h> | |
98 | #include <net/protocol.h> | |
99 | #include <net/arp.h> | |
100 | #include <net/route.h> | |
101 | #include <net/ip_fib.h> | |
295f7324 | 102 | #include <net/inet_connection_sock.h> |
1da177e4 LT |
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 | ||
ba89966c | 116 | DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly; |
1da177e4 | 117 | |
1da177e4 LT |
118 | extern void ip_mc_drop_socket(struct sock *sk); |
119 | ||
120 | /* The inetsw table contains everything that inet_create needs to | |
121 | * build a new socket. | |
122 | */ | |
123 | static struct list_head inetsw[SOCK_MAX]; | |
124 | static DEFINE_SPINLOCK(inetsw_lock); | |
125 | ||
126 | /* New destruction routine */ | |
127 | ||
128 | void inet_sock_destruct(struct sock *sk) | |
129 | { | |
130 | struct inet_sock *inet = inet_sk(sk); | |
131 | ||
132 | __skb_queue_purge(&sk->sk_receive_queue); | |
133 | __skb_queue_purge(&sk->sk_error_queue); | |
134 | ||
135 | if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { | |
136 | printk("Attempt to release TCP socket in state %d %p\n", | |
137 | sk->sk_state, sk); | |
138 | return; | |
139 | } | |
140 | if (!sock_flag(sk, SOCK_DEAD)) { | |
141 | printk("Attempt to release alive inet socket %p\n", sk); | |
142 | return; | |
143 | } | |
144 | ||
145 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
146 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
147 | BUG_TRAP(!sk->sk_wmem_queued); | |
148 | BUG_TRAP(!sk->sk_forward_alloc); | |
149 | ||
a51482bd | 150 | kfree(inet->opt); |
1da177e4 | 151 | dst_release(sk->sk_dst_cache); |
e6848976 | 152 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
153 | } |
154 | ||
155 | /* | |
156 | * The routines beyond this point handle the behaviour of an AF_INET | |
157 | * socket object. Mostly it punts to the subprotocols of IP to do | |
158 | * the work. | |
159 | */ | |
160 | ||
161 | /* | |
162 | * Automatically bind an unbound socket. | |
163 | */ | |
164 | ||
165 | static int inet_autobind(struct sock *sk) | |
166 | { | |
167 | struct inet_sock *inet; | |
168 | /* We may need to bind the socket. */ | |
169 | lock_sock(sk); | |
170 | inet = inet_sk(sk); | |
171 | if (!inet->num) { | |
172 | if (sk->sk_prot->get_port(sk, 0)) { | |
173 | release_sock(sk); | |
174 | return -EAGAIN; | |
175 | } | |
176 | inet->sport = htons(inet->num); | |
177 | } | |
178 | release_sock(sk); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Move a socket into listening state. | |
184 | */ | |
185 | int inet_listen(struct socket *sock, int backlog) | |
186 | { | |
187 | struct sock *sk = sock->sk; | |
188 | unsigned char old_state; | |
189 | int err; | |
190 | ||
191 | lock_sock(sk); | |
192 | ||
193 | err = -EINVAL; | |
194 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) | |
195 | goto out; | |
196 | ||
197 | old_state = sk->sk_state; | |
198 | if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) | |
199 | goto out; | |
200 | ||
201 | /* Really, if the socket is already in listen state | |
202 | * we can only allow the backlog to be adjusted. | |
203 | */ | |
204 | if (old_state != TCP_LISTEN) { | |
0a5578cf | 205 | err = inet_csk_listen_start(sk, TCP_SYNQ_HSIZE); |
1da177e4 LT |
206 | if (err) |
207 | goto out; | |
208 | } | |
209 | sk->sk_max_ack_backlog = backlog; | |
210 | err = 0; | |
211 | ||
212 | out: | |
213 | release_sock(sk); | |
214 | return err; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Create an inet socket. | |
219 | */ | |
220 | ||
221 | static int inet_create(struct socket *sock, int protocol) | |
222 | { | |
223 | struct sock *sk; | |
224 | struct list_head *p; | |
225 | struct inet_protosw *answer; | |
226 | struct inet_sock *inet; | |
227 | struct proto *answer_prot; | |
228 | unsigned char answer_flags; | |
229 | char answer_no_check; | |
bb97d31f ACM |
230 | int try_loading_module = 0; |
231 | int err = -ESOCKTNOSUPPORT; | |
1da177e4 LT |
232 | |
233 | sock->state = SS_UNCONNECTED; | |
234 | ||
235 | /* Look for the requested type/protocol pair. */ | |
236 | answer = NULL; | |
bb97d31f | 237 | lookup_protocol: |
1da177e4 LT |
238 | rcu_read_lock(); |
239 | list_for_each_rcu(p, &inetsw[sock->type]) { | |
240 | answer = list_entry(p, struct inet_protosw, list); | |
241 | ||
242 | /* Check the non-wild match. */ | |
243 | if (protocol == answer->protocol) { | |
244 | if (protocol != IPPROTO_IP) | |
245 | break; | |
246 | } else { | |
247 | /* Check for the two wild cases. */ | |
248 | if (IPPROTO_IP == protocol) { | |
249 | protocol = answer->protocol; | |
250 | break; | |
251 | } | |
252 | if (IPPROTO_IP == answer->protocol) | |
253 | break; | |
254 | } | |
255 | answer = NULL; | |
256 | } | |
257 | ||
bb97d31f ACM |
258 | if (unlikely(answer == NULL)) { |
259 | if (try_loading_module < 2) { | |
260 | rcu_read_unlock(); | |
261 | /* | |
262 | * Be more specific, e.g. net-pf-2-proto-132-type-1 | |
263 | * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) | |
264 | */ | |
265 | if (++try_loading_module == 1) | |
266 | request_module("net-pf-%d-proto-%d-type-%d", | |
267 | PF_INET, protocol, sock->type); | |
268 | /* | |
269 | * Fall back to generic, e.g. net-pf-2-proto-132 | |
270 | * (net-pf-PF_INET-proto-IPPROTO_SCTP) | |
271 | */ | |
272 | else | |
273 | request_module("net-pf-%d-proto-%d", | |
274 | PF_INET, protocol); | |
275 | goto lookup_protocol; | |
276 | } else | |
277 | goto out_rcu_unlock; | |
278 | } | |
279 | ||
1da177e4 LT |
280 | err = -EPERM; |
281 | if (answer->capability > 0 && !capable(answer->capability)) | |
282 | goto out_rcu_unlock; | |
283 | err = -EPROTONOSUPPORT; | |
284 | if (!protocol) | |
285 | goto out_rcu_unlock; | |
286 | ||
287 | sock->ops = answer->ops; | |
288 | answer_prot = answer->prot; | |
289 | answer_no_check = answer->no_check; | |
290 | answer_flags = answer->flags; | |
291 | rcu_read_unlock(); | |
292 | ||
293 | BUG_TRAP(answer_prot->slab != NULL); | |
294 | ||
295 | err = -ENOBUFS; | |
296 | sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1); | |
297 | if (sk == NULL) | |
298 | goto out; | |
299 | ||
300 | err = 0; | |
301 | sk->sk_no_check = answer_no_check; | |
302 | if (INET_PROTOSW_REUSE & answer_flags) | |
303 | sk->sk_reuse = 1; | |
304 | ||
305 | inet = inet_sk(sk); | |
306 | ||
307 | if (SOCK_RAW == sock->type) { | |
308 | inet->num = protocol; | |
309 | if (IPPROTO_RAW == protocol) | |
310 | inet->hdrincl = 1; | |
311 | } | |
312 | ||
313 | if (ipv4_config.no_pmtu_disc) | |
314 | inet->pmtudisc = IP_PMTUDISC_DONT; | |
315 | else | |
316 | inet->pmtudisc = IP_PMTUDISC_WANT; | |
317 | ||
318 | inet->id = 0; | |
319 | ||
320 | sock_init_data(sock, sk); | |
321 | ||
322 | sk->sk_destruct = inet_sock_destruct; | |
323 | sk->sk_family = PF_INET; | |
324 | sk->sk_protocol = protocol; | |
325 | sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
326 | ||
327 | inet->uc_ttl = -1; | |
328 | inet->mc_loop = 1; | |
329 | inet->mc_ttl = 1; | |
330 | inet->mc_index = 0; | |
331 | inet->mc_list = NULL; | |
332 | ||
e6848976 | 333 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
334 | |
335 | if (inet->num) { | |
336 | /* It assumes that any protocol which allows | |
337 | * the user to assign a number at socket | |
338 | * creation time automatically | |
339 | * shares. | |
340 | */ | |
341 | inet->sport = htons(inet->num); | |
342 | /* Add to protocol hash chains. */ | |
343 | sk->sk_prot->hash(sk); | |
344 | } | |
345 | ||
346 | if (sk->sk_prot->init) { | |
347 | err = sk->sk_prot->init(sk); | |
348 | if (err) | |
349 | sk_common_release(sk); | |
350 | } | |
351 | out: | |
352 | return err; | |
353 | out_rcu_unlock: | |
354 | rcu_read_unlock(); | |
355 | goto out; | |
356 | } | |
357 | ||
358 | ||
359 | /* | |
360 | * The peer socket should always be NULL (or else). When we call this | |
361 | * function we are destroying the object and from then on nobody | |
362 | * should refer to it. | |
363 | */ | |
364 | int inet_release(struct socket *sock) | |
365 | { | |
366 | struct sock *sk = sock->sk; | |
367 | ||
368 | if (sk) { | |
369 | long timeout; | |
370 | ||
371 | /* Applications forget to leave groups before exiting */ | |
372 | ip_mc_drop_socket(sk); | |
373 | ||
374 | /* If linger is set, we don't return until the close | |
375 | * is complete. Otherwise we return immediately. The | |
376 | * actually closing is done the same either way. | |
377 | * | |
378 | * If the close is due to the process exiting, we never | |
379 | * linger.. | |
380 | */ | |
381 | timeout = 0; | |
382 | if (sock_flag(sk, SOCK_LINGER) && | |
383 | !(current->flags & PF_EXITING)) | |
384 | timeout = sk->sk_lingertime; | |
385 | sock->sk = NULL; | |
386 | sk->sk_prot->close(sk, timeout); | |
387 | } | |
388 | return 0; | |
389 | } | |
390 | ||
391 | /* It is off by default, see below. */ | |
392 | int sysctl_ip_nonlocal_bind; | |
393 | ||
394 | int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
395 | { | |
396 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
397 | struct sock *sk = sock->sk; | |
398 | struct inet_sock *inet = inet_sk(sk); | |
399 | unsigned short snum; | |
400 | int chk_addr_ret; | |
401 | int err; | |
402 | ||
403 | /* If the socket has its own bind function then use it. (RAW) */ | |
404 | if (sk->sk_prot->bind) { | |
405 | err = sk->sk_prot->bind(sk, uaddr, addr_len); | |
406 | goto out; | |
407 | } | |
408 | err = -EINVAL; | |
409 | if (addr_len < sizeof(struct sockaddr_in)) | |
410 | goto out; | |
411 | ||
412 | chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); | |
413 | ||
414 | /* Not specified by any standard per-se, however it breaks too | |
415 | * many applications when removed. It is unfortunate since | |
416 | * allowing applications to make a non-local bind solves | |
417 | * several problems with systems using dynamic addressing. | |
418 | * (ie. your servers still start up even if your ISDN link | |
419 | * is temporarily down) | |
420 | */ | |
421 | err = -EADDRNOTAVAIL; | |
422 | if (!sysctl_ip_nonlocal_bind && | |
423 | !inet->freebind && | |
424 | addr->sin_addr.s_addr != INADDR_ANY && | |
425 | chk_addr_ret != RTN_LOCAL && | |
426 | chk_addr_ret != RTN_MULTICAST && | |
427 | chk_addr_ret != RTN_BROADCAST) | |
428 | goto out; | |
429 | ||
430 | snum = ntohs(addr->sin_port); | |
431 | err = -EACCES; | |
432 | if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) | |
433 | goto out; | |
434 | ||
435 | /* We keep a pair of addresses. rcv_saddr is the one | |
436 | * used by hash lookups, and saddr is used for transmit. | |
437 | * | |
438 | * In the BSD API these are the same except where it | |
439 | * would be illegal to use them (multicast/broadcast) in | |
440 | * which case the sending device address is used. | |
441 | */ | |
442 | lock_sock(sk); | |
443 | ||
444 | /* Check these errors (active socket, double bind). */ | |
445 | err = -EINVAL; | |
446 | if (sk->sk_state != TCP_CLOSE || inet->num) | |
447 | goto out_release_sock; | |
448 | ||
449 | inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; | |
450 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) | |
451 | inet->saddr = 0; /* Use device */ | |
452 | ||
453 | /* Make sure we are allowed to bind here. */ | |
454 | if (sk->sk_prot->get_port(sk, snum)) { | |
455 | inet->saddr = inet->rcv_saddr = 0; | |
456 | err = -EADDRINUSE; | |
457 | goto out_release_sock; | |
458 | } | |
459 | ||
460 | if (inet->rcv_saddr) | |
461 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
462 | if (snum) | |
463 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
464 | inet->sport = htons(inet->num); | |
465 | inet->daddr = 0; | |
466 | inet->dport = 0; | |
467 | sk_dst_reset(sk); | |
468 | err = 0; | |
469 | out_release_sock: | |
470 | release_sock(sk); | |
471 | out: | |
472 | return err; | |
473 | } | |
474 | ||
475 | int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, | |
476 | int addr_len, int flags) | |
477 | { | |
478 | struct sock *sk = sock->sk; | |
479 | ||
480 | if (uaddr->sa_family == AF_UNSPEC) | |
481 | return sk->sk_prot->disconnect(sk, flags); | |
482 | ||
483 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
484 | return -EAGAIN; | |
485 | return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); | |
486 | } | |
487 | ||
488 | static long inet_wait_for_connect(struct sock *sk, long timeo) | |
489 | { | |
490 | DEFINE_WAIT(wait); | |
491 | ||
492 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
493 | ||
494 | /* Basic assumption: if someone sets sk->sk_err, he _must_ | |
495 | * change state of the socket from TCP_SYN_*. | |
496 | * Connect() does not allow to get error notifications | |
497 | * without closing the socket. | |
498 | */ | |
499 | while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
500 | release_sock(sk); | |
501 | timeo = schedule_timeout(timeo); | |
502 | lock_sock(sk); | |
503 | if (signal_pending(current) || !timeo) | |
504 | break; | |
505 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
506 | } | |
507 | finish_wait(sk->sk_sleep, &wait); | |
508 | return timeo; | |
509 | } | |
510 | ||
511 | /* | |
512 | * Connect to a remote host. There is regrettably still a little | |
513 | * TCP 'magic' in here. | |
514 | */ | |
515 | int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
516 | int addr_len, int flags) | |
517 | { | |
518 | struct sock *sk = sock->sk; | |
519 | int err; | |
520 | long timeo; | |
521 | ||
522 | lock_sock(sk); | |
523 | ||
524 | if (uaddr->sa_family == AF_UNSPEC) { | |
525 | err = sk->sk_prot->disconnect(sk, flags); | |
526 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
527 | goto out; | |
528 | } | |
529 | ||
530 | switch (sock->state) { | |
531 | default: | |
532 | err = -EINVAL; | |
533 | goto out; | |
534 | case SS_CONNECTED: | |
535 | err = -EISCONN; | |
536 | goto out; | |
537 | case SS_CONNECTING: | |
538 | err = -EALREADY; | |
539 | /* Fall out of switch with err, set for this state */ | |
540 | break; | |
541 | case SS_UNCONNECTED: | |
542 | err = -EISCONN; | |
543 | if (sk->sk_state != TCP_CLOSE) | |
544 | goto out; | |
545 | ||
546 | err = sk->sk_prot->connect(sk, uaddr, addr_len); | |
547 | if (err < 0) | |
548 | goto out; | |
549 | ||
550 | sock->state = SS_CONNECTING; | |
551 | ||
552 | /* Just entered SS_CONNECTING state; the only | |
553 | * difference is that return value in non-blocking | |
554 | * case is EINPROGRESS, rather than EALREADY. | |
555 | */ | |
556 | err = -EINPROGRESS; | |
557 | break; | |
558 | } | |
559 | ||
560 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
561 | ||
562 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
563 | /* Error code is set above */ | |
564 | if (!timeo || !inet_wait_for_connect(sk, timeo)) | |
565 | goto out; | |
566 | ||
567 | err = sock_intr_errno(timeo); | |
568 | if (signal_pending(current)) | |
569 | goto out; | |
570 | } | |
571 | ||
572 | /* Connection was closed by RST, timeout, ICMP error | |
573 | * or another process disconnected us. | |
574 | */ | |
575 | if (sk->sk_state == TCP_CLOSE) | |
576 | goto sock_error; | |
577 | ||
578 | /* sk->sk_err may be not zero now, if RECVERR was ordered by user | |
579 | * and error was received after socket entered established state. | |
580 | * Hence, it is handled normally after connect() return successfully. | |
581 | */ | |
582 | ||
583 | sock->state = SS_CONNECTED; | |
584 | err = 0; | |
585 | out: | |
586 | release_sock(sk); | |
587 | return err; | |
588 | ||
589 | sock_error: | |
590 | err = sock_error(sk) ? : -ECONNABORTED; | |
591 | sock->state = SS_UNCONNECTED; | |
592 | if (sk->sk_prot->disconnect(sk, flags)) | |
593 | sock->state = SS_DISCONNECTING; | |
594 | goto out; | |
595 | } | |
596 | ||
597 | /* | |
598 | * Accept a pending connection. The TCP layer now gives BSD semantics. | |
599 | */ | |
600 | ||
601 | int inet_accept(struct socket *sock, struct socket *newsock, int flags) | |
602 | { | |
603 | struct sock *sk1 = sock->sk; | |
604 | int err = -EINVAL; | |
605 | struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); | |
606 | ||
607 | if (!sk2) | |
608 | goto do_err; | |
609 | ||
610 | lock_sock(sk2); | |
611 | ||
612 | BUG_TRAP((1 << sk2->sk_state) & | |
613 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); | |
614 | ||
615 | sock_graft(sk2, newsock); | |
616 | ||
617 | newsock->state = SS_CONNECTED; | |
618 | err = 0; | |
619 | release_sock(sk2); | |
620 | do_err: | |
621 | return err; | |
622 | } | |
623 | ||
624 | ||
625 | /* | |
626 | * This does both peername and sockname. | |
627 | */ | |
628 | int inet_getname(struct socket *sock, struct sockaddr *uaddr, | |
629 | int *uaddr_len, int peer) | |
630 | { | |
631 | struct sock *sk = sock->sk; | |
632 | struct inet_sock *inet = inet_sk(sk); | |
633 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; | |
634 | ||
635 | sin->sin_family = AF_INET; | |
636 | if (peer) { | |
637 | if (!inet->dport || | |
638 | (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && | |
639 | peer == 1)) | |
640 | return -ENOTCONN; | |
641 | sin->sin_port = inet->dport; | |
642 | sin->sin_addr.s_addr = inet->daddr; | |
643 | } else { | |
644 | __u32 addr = inet->rcv_saddr; | |
645 | if (!addr) | |
646 | addr = inet->saddr; | |
647 | sin->sin_port = inet->sport; | |
648 | sin->sin_addr.s_addr = addr; | |
649 | } | |
650 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
651 | *uaddr_len = sizeof(*sin); | |
652 | return 0; | |
653 | } | |
654 | ||
655 | int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | |
656 | size_t size) | |
657 | { | |
658 | struct sock *sk = sock->sk; | |
659 | ||
660 | /* We may need to bind the socket. */ | |
661 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
662 | return -EAGAIN; | |
663 | ||
664 | return sk->sk_prot->sendmsg(iocb, sk, msg, size); | |
665 | } | |
666 | ||
667 | ||
668 | static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
669 | { | |
670 | struct sock *sk = sock->sk; | |
671 | ||
672 | /* We may need to bind the socket. */ | |
673 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
674 | return -EAGAIN; | |
675 | ||
676 | if (sk->sk_prot->sendpage) | |
677 | return sk->sk_prot->sendpage(sk, page, offset, size, flags); | |
678 | return sock_no_sendpage(sock, page, offset, size, flags); | |
679 | } | |
680 | ||
681 | ||
682 | int inet_shutdown(struct socket *sock, int how) | |
683 | { | |
684 | struct sock *sk = sock->sk; | |
685 | int err = 0; | |
686 | ||
687 | /* This should really check to make sure | |
688 | * the socket is a TCP socket. (WHY AC...) | |
689 | */ | |
690 | how++; /* maps 0->1 has the advantage of making bit 1 rcvs and | |
691 | 1->2 bit 2 snds. | |
692 | 2->3 */ | |
693 | if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ | |
694 | return -EINVAL; | |
695 | ||
696 | lock_sock(sk); | |
697 | if (sock->state == SS_CONNECTING) { | |
698 | if ((1 << sk->sk_state) & | |
699 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) | |
700 | sock->state = SS_DISCONNECTING; | |
701 | else | |
702 | sock->state = SS_CONNECTED; | |
703 | } | |
704 | ||
705 | switch (sk->sk_state) { | |
706 | case TCP_CLOSE: | |
707 | err = -ENOTCONN; | |
708 | /* Hack to wake up other listeners, who can poll for | |
709 | POLLHUP, even on eg. unconnected UDP sockets -- RR */ | |
710 | default: | |
711 | sk->sk_shutdown |= how; | |
712 | if (sk->sk_prot->shutdown) | |
713 | sk->sk_prot->shutdown(sk, how); | |
714 | break; | |
715 | ||
716 | /* Remaining two branches are temporary solution for missing | |
717 | * close() in multithreaded environment. It is _not_ a good idea, | |
718 | * but we have no choice until close() is repaired at VFS level. | |
719 | */ | |
720 | case TCP_LISTEN: | |
721 | if (!(how & RCV_SHUTDOWN)) | |
722 | break; | |
723 | /* Fall through */ | |
724 | case TCP_SYN_SENT: | |
725 | err = sk->sk_prot->disconnect(sk, O_NONBLOCK); | |
726 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
727 | break; | |
728 | } | |
729 | ||
730 | /* Wake up anyone sleeping in poll. */ | |
731 | sk->sk_state_change(sk); | |
732 | release_sock(sk); | |
733 | return err; | |
734 | } | |
735 | ||
736 | /* | |
737 | * ioctl() calls you can issue on an INET socket. Most of these are | |
738 | * device configuration and stuff and very rarely used. Some ioctls | |
739 | * pass on to the socket itself. | |
740 | * | |
741 | * NOTE: I like the idea of a module for the config stuff. ie ifconfig | |
742 | * loads the devconfigure module does its configuring and unloads it. | |
743 | * There's a good 20K of config code hanging around the kernel. | |
744 | */ | |
745 | ||
746 | int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
747 | { | |
748 | struct sock *sk = sock->sk; | |
749 | int err = 0; | |
750 | ||
751 | switch (cmd) { | |
752 | case SIOCGSTAMP: | |
753 | err = sock_get_timestamp(sk, (struct timeval __user *)arg); | |
754 | break; | |
755 | case SIOCADDRT: | |
756 | case SIOCDELRT: | |
757 | case SIOCRTMSG: | |
758 | err = ip_rt_ioctl(cmd, (void __user *)arg); | |
759 | break; | |
760 | case SIOCDARP: | |
761 | case SIOCGARP: | |
762 | case SIOCSARP: | |
763 | err = arp_ioctl(cmd, (void __user *)arg); | |
764 | break; | |
765 | case SIOCGIFADDR: | |
766 | case SIOCSIFADDR: | |
767 | case SIOCGIFBRDADDR: | |
768 | case SIOCSIFBRDADDR: | |
769 | case SIOCGIFNETMASK: | |
770 | case SIOCSIFNETMASK: | |
771 | case SIOCGIFDSTADDR: | |
772 | case SIOCSIFDSTADDR: | |
773 | case SIOCSIFPFLAGS: | |
774 | case SIOCGIFPFLAGS: | |
775 | case SIOCSIFFLAGS: | |
776 | err = devinet_ioctl(cmd, (void __user *)arg); | |
777 | break; | |
778 | default: | |
779 | if (!sk->sk_prot->ioctl || | |
780 | (err = sk->sk_prot->ioctl(sk, cmd, arg)) == | |
781 | -ENOIOCTLCMD) | |
782 | err = dev_ioctl(cmd, (void __user *)arg); | |
783 | break; | |
784 | } | |
785 | return err; | |
786 | } | |
787 | ||
788 | struct proto_ops inet_stream_ops = { | |
789 | .family = PF_INET, | |
790 | .owner = THIS_MODULE, | |
791 | .release = inet_release, | |
792 | .bind = inet_bind, | |
793 | .connect = inet_stream_connect, | |
794 | .socketpair = sock_no_socketpair, | |
795 | .accept = inet_accept, | |
796 | .getname = inet_getname, | |
797 | .poll = tcp_poll, | |
798 | .ioctl = inet_ioctl, | |
799 | .listen = inet_listen, | |
800 | .shutdown = inet_shutdown, | |
801 | .setsockopt = sock_common_setsockopt, | |
802 | .getsockopt = sock_common_getsockopt, | |
803 | .sendmsg = inet_sendmsg, | |
804 | .recvmsg = sock_common_recvmsg, | |
805 | .mmap = sock_no_mmap, | |
806 | .sendpage = tcp_sendpage | |
807 | }; | |
808 | ||
809 | struct proto_ops inet_dgram_ops = { | |
810 | .family = PF_INET, | |
811 | .owner = THIS_MODULE, | |
812 | .release = inet_release, | |
813 | .bind = inet_bind, | |
814 | .connect = inet_dgram_connect, | |
815 | .socketpair = sock_no_socketpair, | |
816 | .accept = sock_no_accept, | |
817 | .getname = inet_getname, | |
818 | .poll = udp_poll, | |
819 | .ioctl = inet_ioctl, | |
820 | .listen = sock_no_listen, | |
821 | .shutdown = inet_shutdown, | |
822 | .setsockopt = sock_common_setsockopt, | |
823 | .getsockopt = sock_common_getsockopt, | |
824 | .sendmsg = inet_sendmsg, | |
825 | .recvmsg = sock_common_recvmsg, | |
826 | .mmap = sock_no_mmap, | |
827 | .sendpage = inet_sendpage, | |
828 | }; | |
829 | ||
830 | /* | |
831 | * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without | |
832 | * udp_poll | |
833 | */ | |
834 | static struct proto_ops inet_sockraw_ops = { | |
835 | .family = PF_INET, | |
836 | .owner = THIS_MODULE, | |
837 | .release = inet_release, | |
838 | .bind = inet_bind, | |
839 | .connect = inet_dgram_connect, | |
840 | .socketpair = sock_no_socketpair, | |
841 | .accept = sock_no_accept, | |
842 | .getname = inet_getname, | |
843 | .poll = datagram_poll, | |
844 | .ioctl = inet_ioctl, | |
845 | .listen = sock_no_listen, | |
846 | .shutdown = inet_shutdown, | |
847 | .setsockopt = sock_common_setsockopt, | |
848 | .getsockopt = sock_common_getsockopt, | |
849 | .sendmsg = inet_sendmsg, | |
850 | .recvmsg = sock_common_recvmsg, | |
851 | .mmap = sock_no_mmap, | |
852 | .sendpage = inet_sendpage, | |
853 | }; | |
854 | ||
855 | static struct net_proto_family inet_family_ops = { | |
856 | .family = PF_INET, | |
857 | .create = inet_create, | |
858 | .owner = THIS_MODULE, | |
859 | }; | |
860 | ||
1da177e4 LT |
861 | /* Upon startup we insert all the elements in inetsw_array[] into |
862 | * the linked list inetsw. | |
863 | */ | |
864 | static struct inet_protosw inetsw_array[] = | |
865 | { | |
866 | { | |
867 | .type = SOCK_STREAM, | |
868 | .protocol = IPPROTO_TCP, | |
869 | .prot = &tcp_prot, | |
870 | .ops = &inet_stream_ops, | |
871 | .capability = -1, | |
872 | .no_check = 0, | |
873 | .flags = INET_PROTOSW_PERMANENT, | |
874 | }, | |
875 | ||
876 | { | |
877 | .type = SOCK_DGRAM, | |
878 | .protocol = IPPROTO_UDP, | |
879 | .prot = &udp_prot, | |
880 | .ops = &inet_dgram_ops, | |
881 | .capability = -1, | |
882 | .no_check = UDP_CSUM_DEFAULT, | |
883 | .flags = INET_PROTOSW_PERMANENT, | |
884 | }, | |
885 | ||
886 | ||
887 | { | |
888 | .type = SOCK_RAW, | |
889 | .protocol = IPPROTO_IP, /* wild card */ | |
890 | .prot = &raw_prot, | |
891 | .ops = &inet_sockraw_ops, | |
892 | .capability = CAP_NET_RAW, | |
893 | .no_check = UDP_CSUM_DEFAULT, | |
894 | .flags = INET_PROTOSW_REUSE, | |
895 | } | |
896 | }; | |
897 | ||
898 | #define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw)) | |
899 | ||
900 | void inet_register_protosw(struct inet_protosw *p) | |
901 | { | |
902 | struct list_head *lh; | |
903 | struct inet_protosw *answer; | |
904 | int protocol = p->protocol; | |
905 | struct list_head *last_perm; | |
906 | ||
907 | spin_lock_bh(&inetsw_lock); | |
908 | ||
909 | if (p->type >= SOCK_MAX) | |
910 | goto out_illegal; | |
911 | ||
912 | /* If we are trying to override a permanent protocol, bail. */ | |
913 | answer = NULL; | |
914 | last_perm = &inetsw[p->type]; | |
915 | list_for_each(lh, &inetsw[p->type]) { | |
916 | answer = list_entry(lh, struct inet_protosw, list); | |
917 | ||
918 | /* Check only the non-wild match. */ | |
919 | if (INET_PROTOSW_PERMANENT & answer->flags) { | |
920 | if (protocol == answer->protocol) | |
921 | break; | |
922 | last_perm = lh; | |
923 | } | |
924 | ||
925 | answer = NULL; | |
926 | } | |
927 | if (answer) | |
928 | goto out_permanent; | |
929 | ||
930 | /* Add the new entry after the last permanent entry if any, so that | |
931 | * the new entry does not override a permanent entry when matched with | |
932 | * a wild-card protocol. But it is allowed to override any existing | |
933 | * non-permanent entry. This means that when we remove this entry, the | |
934 | * system automatically returns to the old behavior. | |
935 | */ | |
936 | list_add_rcu(&p->list, last_perm); | |
937 | out: | |
938 | spin_unlock_bh(&inetsw_lock); | |
939 | ||
940 | synchronize_net(); | |
941 | ||
942 | return; | |
943 | ||
944 | out_permanent: | |
945 | printk(KERN_ERR "Attempt to override permanent protocol %d.\n", | |
946 | protocol); | |
947 | goto out; | |
948 | ||
949 | out_illegal: | |
950 | printk(KERN_ERR | |
951 | "Ignoring attempt to register invalid socket type %d.\n", | |
952 | p->type); | |
953 | goto out; | |
954 | } | |
955 | ||
956 | void inet_unregister_protosw(struct inet_protosw *p) | |
957 | { | |
958 | if (INET_PROTOSW_PERMANENT & p->flags) { | |
959 | printk(KERN_ERR | |
960 | "Attempt to unregister permanent protocol %d.\n", | |
961 | p->protocol); | |
962 | } else { | |
963 | spin_lock_bh(&inetsw_lock); | |
964 | list_del_rcu(&p->list); | |
965 | spin_unlock_bh(&inetsw_lock); | |
966 | ||
967 | synchronize_net(); | |
968 | } | |
969 | } | |
970 | ||
32519f11 ACM |
971 | /* |
972 | * Shall we try to damage output packets if routing dev changes? | |
973 | */ | |
974 | ||
975 | int sysctl_ip_dynaddr; | |
976 | ||
977 | static int inet_sk_reselect_saddr(struct sock *sk) | |
978 | { | |
979 | struct inet_sock *inet = inet_sk(sk); | |
980 | int err; | |
981 | struct rtable *rt; | |
982 | __u32 old_saddr = inet->saddr; | |
983 | __u32 new_saddr; | |
984 | __u32 daddr = inet->daddr; | |
985 | ||
986 | if (inet->opt && inet->opt->srr) | |
987 | daddr = inet->opt->faddr; | |
988 | ||
989 | /* Query new route. */ | |
990 | err = ip_route_connect(&rt, daddr, 0, | |
991 | RT_CONN_FLAGS(sk), | |
992 | sk->sk_bound_dev_if, | |
993 | sk->sk_protocol, | |
994 | inet->sport, inet->dport, sk); | |
995 | if (err) | |
996 | return err; | |
997 | ||
998 | sk_setup_caps(sk, &rt->u.dst); | |
999 | ||
1000 | new_saddr = rt->rt_src; | |
1001 | ||
1002 | if (new_saddr == old_saddr) | |
1003 | return 0; | |
1004 | ||
1005 | if (sysctl_ip_dynaddr > 1) { | |
1006 | printk(KERN_INFO "%s(): shifting inet->" | |
1007 | "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n", | |
1008 | __FUNCTION__, | |
1009 | NIPQUAD(old_saddr), | |
1010 | NIPQUAD(new_saddr)); | |
1011 | } | |
1012 | ||
1013 | inet->saddr = inet->rcv_saddr = new_saddr; | |
1014 | ||
1015 | /* | |
1016 | * XXX The only one ugly spot where we need to | |
1017 | * XXX really change the sockets identity after | |
1018 | * XXX it has entered the hashes. -DaveM | |
1019 | * | |
1020 | * Besides that, it does not check for connection | |
1021 | * uniqueness. Wait for troubles. | |
1022 | */ | |
1023 | __sk_prot_rehash(sk); | |
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | int inet_sk_rebuild_header(struct sock *sk) | |
1028 | { | |
1029 | struct inet_sock *inet = inet_sk(sk); | |
1030 | struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); | |
1031 | u32 daddr; | |
1032 | int err; | |
1033 | ||
1034 | /* Route is OK, nothing to do. */ | |
1035 | if (rt) | |
1036 | return 0; | |
1037 | ||
1038 | /* Reroute. */ | |
1039 | daddr = inet->daddr; | |
1040 | if (inet->opt && inet->opt->srr) | |
1041 | daddr = inet->opt->faddr; | |
1042 | { | |
1043 | struct flowi fl = { | |
1044 | .oif = sk->sk_bound_dev_if, | |
1045 | .nl_u = { | |
1046 | .ip4_u = { | |
1047 | .daddr = daddr, | |
1048 | .saddr = inet->saddr, | |
1049 | .tos = RT_CONN_FLAGS(sk), | |
1050 | }, | |
1051 | }, | |
1052 | .proto = sk->sk_protocol, | |
1053 | .uli_u = { | |
1054 | .ports = { | |
1055 | .sport = inet->sport, | |
1056 | .dport = inet->dport, | |
1057 | }, | |
1058 | }, | |
1059 | }; | |
1060 | ||
1061 | err = ip_route_output_flow(&rt, &fl, sk, 0); | |
1062 | } | |
1063 | if (!err) | |
1064 | sk_setup_caps(sk, &rt->u.dst); | |
1065 | else { | |
1066 | /* Routing failed... */ | |
1067 | sk->sk_route_caps = 0; | |
1068 | /* | |
1069 | * Other protocols have to map its equivalent state to TCP_SYN_SENT. | |
1070 | * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme | |
1071 | */ | |
1072 | if (!sysctl_ip_dynaddr || | |
1073 | sk->sk_state != TCP_SYN_SENT || | |
1074 | (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || | |
1075 | (err = inet_sk_reselect_saddr(sk)) != 0) | |
1076 | sk->sk_err_soft = -err; | |
1077 | } | |
1078 | ||
1079 | return err; | |
1080 | } | |
1081 | ||
1082 | EXPORT_SYMBOL(inet_sk_rebuild_header); | |
1083 | ||
1da177e4 LT |
1084 | #ifdef CONFIG_IP_MULTICAST |
1085 | static struct net_protocol igmp_protocol = { | |
1086 | .handler = igmp_rcv, | |
1087 | }; | |
1088 | #endif | |
1089 | ||
1090 | static struct net_protocol tcp_protocol = { | |
1091 | .handler = tcp_v4_rcv, | |
1092 | .err_handler = tcp_v4_err, | |
1093 | .no_policy = 1, | |
1094 | }; | |
1095 | ||
1096 | static struct net_protocol udp_protocol = { | |
1097 | .handler = udp_rcv, | |
1098 | .err_handler = udp_err, | |
1099 | .no_policy = 1, | |
1100 | }; | |
1101 | ||
1102 | static struct net_protocol icmp_protocol = { | |
1103 | .handler = icmp_rcv, | |
1104 | }; | |
1105 | ||
1106 | static int __init init_ipv4_mibs(void) | |
1107 | { | |
1108 | net_statistics[0] = alloc_percpu(struct linux_mib); | |
1109 | net_statistics[1] = alloc_percpu(struct linux_mib); | |
1110 | ip_statistics[0] = alloc_percpu(struct ipstats_mib); | |
1111 | ip_statistics[1] = alloc_percpu(struct ipstats_mib); | |
1112 | icmp_statistics[0] = alloc_percpu(struct icmp_mib); | |
1113 | icmp_statistics[1] = alloc_percpu(struct icmp_mib); | |
1114 | tcp_statistics[0] = alloc_percpu(struct tcp_mib); | |
1115 | tcp_statistics[1] = alloc_percpu(struct tcp_mib); | |
1116 | udp_statistics[0] = alloc_percpu(struct udp_mib); | |
1117 | udp_statistics[1] = alloc_percpu(struct udp_mib); | |
1118 | if (! | |
1119 | (net_statistics[0] && net_statistics[1] && ip_statistics[0] | |
1120 | && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1] | |
1121 | && udp_statistics[0] && udp_statistics[1])) | |
1122 | return -ENOMEM; | |
1123 | ||
1124 | (void) tcp_mib_init(); | |
1125 | ||
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | static int ipv4_proc_init(void); | |
1da177e4 | 1130 | |
30e224d7 HX |
1131 | /* |
1132 | * IP protocol layer initialiser | |
1133 | */ | |
1134 | ||
1135 | static struct packet_type ip_packet_type = { | |
1136 | .type = __constant_htons(ETH_P_IP), | |
1137 | .func = ip_rcv, | |
1138 | }; | |
1139 | ||
1da177e4 LT |
1140 | static int __init inet_init(void) |
1141 | { | |
1142 | struct sk_buff *dummy_skb; | |
1143 | struct inet_protosw *q; | |
1144 | struct list_head *r; | |
1145 | int rc = -EINVAL; | |
1146 | ||
1147 | if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) { | |
1148 | printk(KERN_CRIT "%s: panic\n", __FUNCTION__); | |
1149 | goto out; | |
1150 | } | |
1151 | ||
1152 | rc = proto_register(&tcp_prot, 1); | |
1153 | if (rc) | |
1154 | goto out; | |
1155 | ||
1156 | rc = proto_register(&udp_prot, 1); | |
1157 | if (rc) | |
1158 | goto out_unregister_tcp_proto; | |
1159 | ||
1160 | rc = proto_register(&raw_prot, 1); | |
1161 | if (rc) | |
1162 | goto out_unregister_udp_proto; | |
1163 | ||
1164 | /* | |
1165 | * Tell SOCKET that we are alive... | |
1166 | */ | |
1167 | ||
1168 | (void)sock_register(&inet_family_ops); | |
1169 | ||
1170 | /* | |
1171 | * Add all the base protocols. | |
1172 | */ | |
1173 | ||
1174 | if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) | |
1175 | printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); | |
1176 | if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) | |
1177 | printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); | |
1178 | if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) | |
1179 | printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); | |
1180 | #ifdef CONFIG_IP_MULTICAST | |
1181 | if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) | |
1182 | printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); | |
1183 | #endif | |
1184 | ||
1185 | /* Register the socket-side information for inet_create. */ | |
1186 | for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) | |
1187 | INIT_LIST_HEAD(r); | |
1188 | ||
1189 | for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) | |
1190 | inet_register_protosw(q); | |
1191 | ||
1192 | /* | |
1193 | * Set the ARP module up | |
1194 | */ | |
1195 | ||
1196 | arp_init(); | |
1197 | ||
1198 | /* | |
1199 | * Set the IP module up | |
1200 | */ | |
1201 | ||
1202 | ip_init(); | |
1203 | ||
1204 | tcp_v4_init(&inet_family_ops); | |
1205 | ||
1206 | /* Setup TCP slab cache for open requests. */ | |
1207 | tcp_init(); | |
1208 | ||
1209 | ||
1210 | /* | |
1211 | * Set the ICMP layer up | |
1212 | */ | |
1213 | ||
1214 | icmp_init(&inet_family_ops); | |
1215 | ||
1216 | /* | |
1217 | * Initialise the multicast router | |
1218 | */ | |
1219 | #if defined(CONFIG_IP_MROUTE) | |
1220 | ip_mr_init(); | |
1221 | #endif | |
1222 | /* | |
1223 | * Initialise per-cpu ipv4 mibs | |
1224 | */ | |
1225 | ||
1226 | if(init_ipv4_mibs()) | |
1227 | printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ; | |
1228 | ||
1229 | ipv4_proc_init(); | |
1230 | ||
1231 | ipfrag_init(); | |
1232 | ||
30e224d7 HX |
1233 | dev_add_pack(&ip_packet_type); |
1234 | ||
1da177e4 LT |
1235 | rc = 0; |
1236 | out: | |
1237 | return rc; | |
1238 | out_unregister_tcp_proto: | |
1239 | proto_unregister(&tcp_prot); | |
1240 | out_unregister_udp_proto: | |
1241 | proto_unregister(&udp_prot); | |
1242 | goto out; | |
1243 | } | |
1244 | ||
1245 | module_init(inet_init); | |
1246 | ||
1247 | /* ------------------------------------------------------------------------ */ | |
1248 | ||
1249 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
1250 | static int __init ipv4_proc_init(void) |
1251 | { | |
1252 | int rc = 0; | |
1253 | ||
1254 | if (raw_proc_init()) | |
1255 | goto out_raw; | |
1256 | if (tcp4_proc_init()) | |
1257 | goto out_tcp; | |
1258 | if (udp4_proc_init()) | |
1259 | goto out_udp; | |
1260 | if (fib_proc_init()) | |
1261 | goto out_fib; | |
1262 | if (ip_misc_proc_init()) | |
1263 | goto out_misc; | |
1264 | out: | |
1265 | return rc; | |
1266 | out_misc: | |
1267 | fib_proc_exit(); | |
1268 | out_fib: | |
1269 | udp4_proc_exit(); | |
1270 | out_udp: | |
1271 | tcp4_proc_exit(); | |
1272 | out_tcp: | |
1273 | raw_proc_exit(); | |
1274 | out_raw: | |
1275 | rc = -ENOMEM; | |
1276 | goto out; | |
1277 | } | |
1278 | ||
1279 | #else /* CONFIG_PROC_FS */ | |
1280 | static int __init ipv4_proc_init(void) | |
1281 | { | |
1282 | return 0; | |
1283 | } | |
1284 | #endif /* CONFIG_PROC_FS */ | |
1285 | ||
1286 | MODULE_ALIAS_NETPROTO(PF_INET); | |
1287 | ||
1288 | EXPORT_SYMBOL(inet_accept); | |
1289 | EXPORT_SYMBOL(inet_bind); | |
1290 | EXPORT_SYMBOL(inet_dgram_connect); | |
1291 | EXPORT_SYMBOL(inet_dgram_ops); | |
1292 | EXPORT_SYMBOL(inet_getname); | |
1293 | EXPORT_SYMBOL(inet_ioctl); | |
1294 | EXPORT_SYMBOL(inet_listen); | |
1295 | EXPORT_SYMBOL(inet_register_protosw); | |
1296 | EXPORT_SYMBOL(inet_release); | |
1297 | EXPORT_SYMBOL(inet_sendmsg); | |
1298 | EXPORT_SYMBOL(inet_shutdown); | |
1299 | EXPORT_SYMBOL(inet_sock_destruct); | |
1300 | EXPORT_SYMBOL(inet_stream_connect); | |
1301 | EXPORT_SYMBOL(inet_stream_ops); | |
1302 | EXPORT_SYMBOL(inet_unregister_protosw); | |
1303 | EXPORT_SYMBOL(net_statistics); | |
cdac4e07 | 1304 | EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); |