blob: 10e3751466b502edd4a4bee3fe91affc5c470f11 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * PF_INET protocol family socket handler.
7 *
Jesper Juhl02c30a82005-05-05 16:16:16 -07008 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Florian La Roche, <flla@stud.uni-sb.de>
11 * Alan Cox, <A.Cox@swansea.ac.uk>
12 *
13 * Changes (see also sock.c)
14 *
15 * piggy,
16 * Karl Knutson : Socket protocol table
17 * A.N.Kuznetsov : Socket death error in accept().
18 * John Richardson : Fix non blocking error in connect()
19 * so sockets that fail to connect
20 * don't return -EINPROGRESS.
21 * Alan Cox : Asynchronous I/O support
22 * Alan Cox : Keep correct socket pointer on sock
23 * structures
24 * when accept() ed
25 * Alan Cox : Semantics of SO_LINGER aren't state
26 * moved to close when you look carefully.
27 * With this fixed and the accept bug fixed
28 * some RPC stuff seems happier.
29 * Niibe Yutaka : 4.4BSD style write async I/O
30 * Alan Cox,
31 * Tony Gale : Fixed reuse semantics.
32 * Alan Cox : bind() shouldn't abort existing but dead
33 * sockets. Stops FTP netin:.. I hope.
34 * Alan Cox : bind() works correctly for RAW sockets.
35 * Note that FreeBSD at least was broken
36 * in this respect so be careful with
37 * compatibility tests...
38 * Alan Cox : routing cache support
39 * Alan Cox : memzero the socket structure for
40 * compactness.
41 * Matt Day : nonblock connect error handler
42 * Alan Cox : Allow large numbers of pending sockets
43 * (eg for big web sites), but only if
44 * specifically application requested.
45 * Alan Cox : New buffering throughout IP. Used
46 * dumbly.
47 * Alan Cox : New buffering now used smartly.
48 * Alan Cox : BSD rather than common sense
49 * interpretation of listen.
50 * Germano Caronni : Assorted small races.
51 * Alan Cox : sendmsg/recvmsg basic support.
52 * Alan Cox : Only sendmsg/recvmsg now supported.
53 * Alan Cox : Locked down bind (see security list).
54 * Alan Cox : Loosened bind a little.
55 * Mike McLagan : ADD/DEL DLCI Ioctls
56 * Willy Konynenberg : Transparent proxying support.
57 * David S. Miller : New socket lookup architecture.
58 * Some other random speedups.
59 * Cyrus Durgin : Cleaned up file for kmod hacks.
60 * Andi Kleen : Fix inet_stream_connect TCP race.
61 *
62 * This program is free software; you can redistribute it and/or
63 * modify it under the terms of the GNU General Public License
64 * as published by the Free Software Foundation; either version
65 * 2 of the License, or (at your option) any later version.
66 */
67
Joe Perchesafd465032012-03-12 07:03:32 +000068#define pr_fmt(fmt) "IPv4: " fmt
69
Herbert Xuf4c50d92006-06-22 03:02:40 -070070#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <linux/errno.h>
72#include <linux/types.h>
73#include <linux/socket.h>
74#include <linux/in.h>
75#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <linux/module.h>
77#include <linux/sched.h>
78#include <linux/timer.h>
79#include <linux/string.h>
80#include <linux/sockios.h>
81#include <linux/net.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080082#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#include <linux/fcntl.h>
84#include <linux/mm.h>
85#include <linux/interrupt.h>
86#include <linux/stat.h>
87#include <linux/init.h>
88#include <linux/poll.h>
89#include <linux/netfilter_ipv4.h>
David S. Millerb3da2cf2007-03-23 11:40:27 -070090#include <linux/random.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090091#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#include <linux/inet.h>
96#include <linux/igmp.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020097#include <linux/inetdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#include <linux/netdevice.h>
Herbert Xu73cc19f2008-12-15 23:41:09 -080099#include <net/checksum.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100#include <net/ip.h>
101#include <net/protocol.h>
102#include <net/arp.h>
103#include <net/route.h>
104#include <net/ip_fib.h>
Arnaldo Carvalho de Melo295f7322005-08-09 20:11:56 -0700105#include <net/inet_connection_sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106#include <net/tcp.h>
107#include <net/udp.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800108#include <net/udplite.h>
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000109#include <net/ping.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110#include <linux/skbuff.h>
111#include <net/sock.h>
112#include <net/raw.h>
113#include <net/icmp.h>
114#include <net/ipip.h>
115#include <net/inet_common.h>
116#include <net/xfrm.h>
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -0700117#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118#ifdef CONFIG_IP_MROUTE
119#include <linux/mroute.h>
120#endif
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123/* The inetsw table contains everything that inet_create needs to
124 * build a new socket.
125 */
126static struct list_head inetsw[SOCK_MAX];
127static DEFINE_SPINLOCK(inetsw_lock);
128
Pavel Emelyanov9ba63972007-12-05 01:38:23 -0800129struct ipv4_config ipv4_config;
Pavel Emelyanov9ba63972007-12-05 01:38:23 -0800130EXPORT_SYMBOL(ipv4_config);
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132/* New destruction routine */
133
134void inet_sock_destruct(struct sock *sk)
135{
136 struct inet_sock *inet = inet_sk(sk);
137
138 __skb_queue_purge(&sk->sk_receive_queue);
139 __skb_queue_purge(&sk->sk_error_queue);
140
Hideo Aoki95766ff2007-12-31 00:29:24 -0800141 sk_mem_reclaim(sk);
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700144 pr_err("Attempt to release TCP socket in state %d %p\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 sk->sk_state, sk);
146 return;
147 }
148 if (!sock_flag(sk, SOCK_DEAD)) {
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700149 pr_err("Attempt to release alive inet socket %p\n", sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 return;
151 }
152
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700153 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
154 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
155 WARN_ON(sk->sk_wmem_queued);
156 WARN_ON(sk->sk_forward_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000158 kfree(rcu_dereference_protected(inet->inet_opt, 1));
Eric Dumazetb6c67122010-04-08 23:03:29 +0000159 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700160 sk_refcnt_debug_dec(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700162EXPORT_SYMBOL(inet_sock_destruct);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
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);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000180 if (!inet->inet_num) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (sk->sk_prot->get_port(sk, 0)) {
182 release_sock(sk);
183 return -EAGAIN;
184 }
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000185 inet->inet_sport = htons(inet->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 }
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) {
Eric Dumazet72a3eff2006-11-16 02:30:37 -0800214 err = inet_csk_listen_start(sk, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 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}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700225EXPORT_SYMBOL(inet_listen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
Eric Dumazetbe776282007-03-27 13:53:04 -0700227u32 inet_ehash_secret __read_mostly;
David S. Millerb3da2cf2007-03-23 11:40:27 -0700228EXPORT_SYMBOL(inet_ehash_secret);
229
Eric Dumazetbe776282007-03-27 13:53:04 -0700230/*
231 * inet_ehash_secret must be set exactly once
Eric Dumazetbe776282007-03-27 13:53:04 -0700232 */
David S. Millerb3da2cf2007-03-23 11:40:27 -0700233void build_ehash_secret(void)
234{
Eric Dumazetbe776282007-03-27 13:53:04 -0700235 u32 rnd;
Eric Dumazet49e8ab02010-08-19 06:10:45 +0000236
Eric Dumazetbe776282007-03-27 13:53:04 -0700237 do {
238 get_random_bytes(&rnd, sizeof(rnd));
239 } while (rnd == 0);
Eric Dumazet49e8ab02010-08-19 06:10:45 +0000240
241 cmpxchg(&inet_ehash_secret, 0, rnd);
David S. Millerb3da2cf2007-03-23 11:40:27 -0700242}
243EXPORT_SYMBOL(build_ehash_secret);
244
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700245static inline int inet_netns_ok(struct net *net, int protocol)
246{
247 int hash;
Alexey Dobriyan32613092009-09-14 12:21:47 +0000248 const struct net_protocol *ipprot;
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700249
Eric Dumazet04f258c2008-11-23 15:42:23 -0800250 if (net_eq(net, &init_net))
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700251 return 1;
252
253 hash = protocol & (MAX_INET_PROTOS - 1);
254 ipprot = rcu_dereference(inet_protos[hash]);
255
256 if (ipprot == NULL)
257 /* raw IP is OK */
258 return 1;
259 return ipprot->netns_ok;
260}
261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262/*
263 * Create an inet socket.
264 */
265
Eric Paris3f378b62009-11-05 22:18:14 -0800266static int inet_create(struct net *net, struct socket *sock, int protocol,
267 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
269 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 struct inet_protosw *answer;
271 struct inet_sock *inet;
272 struct proto *answer_prot;
273 unsigned char answer_flags;
274 char answer_no_check;
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700275 int try_loading_module = 0;
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800276 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Eric Dumazet04f258c2008-11-23 15:42:23 -0800278 if (unlikely(!inet_ehash_secret))
279 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
280 build_ehash_secret();
David S. Millerb3da2cf2007-03-23 11:40:27 -0700281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 sock->state = SS_UNCONNECTED;
283
284 /* Look for the requested type/protocol pair. */
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700285lookup_protocol:
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800286 err = -ESOCKTNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 rcu_read_lock();
Paul E. McKenney696adfe2008-07-25 01:45:34 -0700288 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Paul E. McKenney696adfe2008-07-25 01:45:34 -0700290 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 /* Check the non-wild match. */
292 if (protocol == answer->protocol) {
293 if (protocol != IPPROTO_IP)
294 break;
295 } else {
296 /* Check for the two wild cases. */
297 if (IPPROTO_IP == protocol) {
298 protocol = answer->protocol;
299 break;
300 }
301 if (IPPROTO_IP == answer->protocol)
302 break;
303 }
Herbert Xu86c8f9d2005-12-02 20:43:26 -0800304 err = -EPROTONOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 }
306
Paul E. McKenney696adfe2008-07-25 01:45:34 -0700307 if (unlikely(err)) {
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -0700308 if (try_loading_module < 2) {
309 rcu_read_unlock();
310 /*
311 * Be more specific, e.g. net-pf-2-proto-132-type-1
312 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
313 */
314 if (++try_loading_module == 1)
315 request_module("net-pf-%d-proto-%d-type-%d",
316 PF_INET, protocol, sock->type);
317 /*
318 * Fall back to generic, e.g. net-pf-2-proto-132
319 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
320 */
321 else
322 request_module("net-pf-%d-proto-%d",
323 PF_INET, protocol);
324 goto lookup_protocol;
325 } else
326 goto out_rcu_unlock;
327 }
328
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 err = -EPERM;
Eric Parisc84b3262009-11-05 20:45:52 -0800330 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
Denis V. Lunev2342fd72008-03-24 15:33:42 -0700333 err = -EAFNOSUPPORT;
334 if (!inet_netns_ok(net, protocol))
335 goto out_rcu_unlock;
336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 sock->ops = answer->ops;
338 answer_prot = answer->prot;
339 answer_no_check = answer->no_check;
340 answer_flags = answer->flags;
341 rcu_read_unlock();
342
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700343 WARN_ON(answer_prot->slab == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
345 err = -ENOBUFS;
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700346 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 if (sk == NULL)
348 goto out;
349
350 err = 0;
351 sk->sk_no_check = answer_no_check;
352 if (INET_PROTOSW_REUSE & answer_flags)
353 sk->sk_reuse = 1;
354
355 inet = inet_sk(sk);
Paul Moore469de9b2007-01-09 14:37:06 -0800356 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
Jiri Olsa7b2ff182010-06-15 01:07:31 +0000358 inet->nodefrag = 0;
359
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 if (SOCK_RAW == sock->type) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000361 inet->inet_num = protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (IPPROTO_RAW == protocol)
363 inet->hdrincl = 1;
364 }
365
366 if (ipv4_config.no_pmtu_disc)
367 inet->pmtudisc = IP_PMTUDISC_DONT;
368 else
369 inet->pmtudisc = IP_PMTUDISC_WANT;
370
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000371 inet->inet_id = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
373 sock_init_data(sock, sk);
374
375 sk->sk_destruct = inet_sock_destruct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 sk->sk_protocol = protocol;
377 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
378
379 inet->uc_ttl = -1;
380 inet->mc_loop = 1;
381 inet->mc_ttl = 1;
Nivedita Singhvif771bef2009-05-28 07:00:46 +0000382 inet->mc_all = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 inet->mc_index = 0;
384 inet->mc_list = NULL;
Jiri Benc4c507d22012-02-09 09:35:49 +0000385 inet->rcv_tos = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700387 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000389 if (inet->inet_num) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 /* It assumes that any protocol which allows
391 * the user to assign a number at socket
392 * creation time automatically
393 * shares.
394 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000395 inet->inet_sport = htons(inet->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 /* Add to protocol hash chains. */
397 sk->sk_prot->hash(sk);
398 }
399
400 if (sk->sk_prot->init) {
401 err = sk->sk_prot->init(sk);
402 if (err)
403 sk_common_release(sk);
404 }
405out:
406 return err;
407out_rcu_unlock:
408 rcu_read_unlock();
409 goto out;
410}
411
412
413/*
414 * The peer socket should always be NULL (or else). When we call this
415 * function we are destroying the object and from then on nobody
416 * should refer to it.
417 */
418int inet_release(struct socket *sock)
419{
420 struct sock *sk = sock->sk;
421
422 if (sk) {
423 long timeout;
424
David S. Millerc58dc012010-04-27 15:05:31 -0700425 sock_rps_reset_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 /* Applications forget to leave groups before exiting */
428 ip_mc_drop_socket(sk);
429
430 /* If linger is set, we don't return until the close
431 * is complete. Otherwise we return immediately. The
432 * actually closing is done the same either way.
433 *
434 * If the close is due to the process exiting, we never
435 * linger..
436 */
437 timeout = 0;
438 if (sock_flag(sk, SOCK_LINGER) &&
439 !(current->flags & PF_EXITING))
440 timeout = sk->sk_lingertime;
441 sock->sk = NULL;
442 sk->sk_prot->close(sk, timeout);
443 }
444 return 0;
445}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700446EXPORT_SYMBOL(inet_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
448/* It is off by default, see below. */
Brian Haleyab32ea52006-09-22 14:15:41 -0700449int sysctl_ip_nonlocal_bind __read_mostly;
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700450EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
452int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
453{
454 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
455 struct sock *sk = sock->sk;
456 struct inet_sock *inet = inet_sk(sk);
457 unsigned short snum;
458 int chk_addr_ret;
459 int err;
460
461 /* If the socket has its own bind function then use it. (RAW) */
462 if (sk->sk_prot->bind) {
463 err = sk->sk_prot->bind(sk, uaddr, addr_len);
464 goto out;
465 }
466 err = -EINVAL;
467 if (addr_len < sizeof(struct sockaddr_in))
468 goto out;
469
Marcus Meissnerc349a522011-07-04 01:30:29 +0000470 if (addr->sin_family != AF_INET) {
Eric Dumazet29c486d2011-08-30 18:57:00 -0400471 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
472 * only if s_addr is INADDR_ANY.
473 */
Marcus Meissnerc349a522011-07-04 01:30:29 +0000474 err = -EAFNOSUPPORT;
Eric Dumazet29c486d2011-08-30 18:57:00 -0400475 if (addr->sin_family != AF_UNSPEC ||
476 addr->sin_addr.s_addr != htonl(INADDR_ANY))
477 goto out;
Marcus Meissnerc349a522011-07-04 01:30:29 +0000478 }
Marcus Meissnerd0733d22011-06-01 21:05:22 -0700479
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900480 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482 /* Not specified by any standard per-se, however it breaks too
483 * many applications when removed. It is unfortunate since
484 * allowing applications to make a non-local bind solves
485 * several problems with systems using dynamic addressing.
486 * (ie. your servers still start up even if your ISDN link
487 * is temporarily down)
488 */
489 err = -EADDRNOTAVAIL;
490 if (!sysctl_ip_nonlocal_bind &&
Tóth László Attilab9fb1502008-10-01 07:31:24 -0700491 !(inet->freebind || inet->transparent) &&
Al Viroe6f1ceb2008-03-17 22:44:53 -0700492 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 chk_addr_ret != RTN_LOCAL &&
494 chk_addr_ret != RTN_MULTICAST &&
495 chk_addr_ret != RTN_BROADCAST)
496 goto out;
497
498 snum = ntohs(addr->sin_port);
499 err = -EACCES;
500 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
501 goto out;
502
503 /* We keep a pair of addresses. rcv_saddr is the one
504 * used by hash lookups, and saddr is used for transmit.
505 *
506 * In the BSD API these are the same except where it
507 * would be illegal to use them (multicast/broadcast) in
508 * which case the sending device address is used.
509 */
510 lock_sock(sk);
511
512 /* Check these errors (active socket, double bind). */
513 err = -EINVAL;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000514 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 goto out_release_sock;
516
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000517 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000519 inet->inet_saddr = 0; /* Use device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
521 /* Make sure we are allowed to bind here. */
522 if (sk->sk_prot->get_port(sk, snum)) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000523 inet->inet_saddr = inet->inet_rcv_saddr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 err = -EADDRINUSE;
525 goto out_release_sock;
526 }
527
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000528 if (inet->inet_rcv_saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
530 if (snum)
531 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000532 inet->inet_sport = htons(inet->inet_num);
533 inet->inet_daddr = 0;
534 inet->inet_dport = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 sk_dst_reset(sk);
536 err = 0;
537out_release_sock:
538 release_sock(sk);
539out:
540 return err;
541}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700542EXPORT_SYMBOL(inet_bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
545 int addr_len, int flags)
546{
547 struct sock *sk = sock->sk;
548
Changli Gao6503d962010-03-31 22:58:26 +0000549 if (addr_len < sizeof(uaddr->sa_family))
550 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 if (uaddr->sa_family == AF_UNSPEC)
552 return sk->sk_prot->disconnect(sk, flags);
553
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000554 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 return -EAGAIN;
556 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
557}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700558EXPORT_SYMBOL(inet_dgram_connect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
560static long inet_wait_for_connect(struct sock *sk, long timeo)
561{
562 DEFINE_WAIT(wait);
563
Eric Dumazetaa395142010-04-20 13:03:51 +0000564 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
566 /* Basic assumption: if someone sets sk->sk_err, he _must_
567 * change state of the socket from TCP_SYN_*.
568 * Connect() does not allow to get error notifications
569 * without closing the socket.
570 */
571 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
572 release_sock(sk);
573 timeo = schedule_timeout(timeo);
574 lock_sock(sk);
575 if (signal_pending(current) || !timeo)
576 break;
Eric Dumazetaa395142010-04-20 13:03:51 +0000577 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 }
Eric Dumazetaa395142010-04-20 13:03:51 +0000579 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 return timeo;
581}
582
583/*
584 * Connect to a remote host. There is regrettably still a little
585 * TCP 'magic' in here.
586 */
587int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
588 int addr_len, int flags)
589{
590 struct sock *sk = sock->sk;
591 int err;
592 long timeo;
593
Changli Gao6503d962010-03-31 22:58:26 +0000594 if (addr_len < sizeof(uaddr->sa_family))
595 return -EINVAL;
596
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 lock_sock(sk);
598
599 if (uaddr->sa_family == AF_UNSPEC) {
600 err = sk->sk_prot->disconnect(sk, flags);
601 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
602 goto out;
603 }
604
605 switch (sock->state) {
606 default:
607 err = -EINVAL;
608 goto out;
609 case SS_CONNECTED:
610 err = -EISCONN;
611 goto out;
612 case SS_CONNECTING:
613 err = -EALREADY;
614 /* Fall out of switch with err, set for this state */
615 break;
616 case SS_UNCONNECTED:
617 err = -EISCONN;
618 if (sk->sk_state != TCP_CLOSE)
619 goto out;
620
621 err = sk->sk_prot->connect(sk, uaddr, addr_len);
622 if (err < 0)
623 goto out;
624
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900625 sock->state = SS_CONNECTING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
627 /* Just entered SS_CONNECTING state; the only
628 * difference is that return value in non-blocking
629 * case is EINPROGRESS, rather than EALREADY.
630 */
631 err = -EINPROGRESS;
632 break;
633 }
634
635 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
636
637 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
638 /* Error code is set above */
639 if (!timeo || !inet_wait_for_connect(sk, timeo))
640 goto out;
641
642 err = sock_intr_errno(timeo);
643 if (signal_pending(current))
644 goto out;
645 }
646
647 /* Connection was closed by RST, timeout, ICMP error
648 * or another process disconnected us.
649 */
650 if (sk->sk_state == TCP_CLOSE)
651 goto sock_error;
652
653 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
654 * and error was received after socket entered established state.
655 * Hence, it is handled normally after connect() return successfully.
656 */
657
658 sock->state = SS_CONNECTED;
659 err = 0;
660out:
661 release_sock(sk);
662 return err;
663
664sock_error:
665 err = sock_error(sk) ? : -ECONNABORTED;
666 sock->state = SS_UNCONNECTED;
667 if (sk->sk_prot->disconnect(sk, flags))
668 sock->state = SS_DISCONNECTING;
669 goto out;
670}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700671EXPORT_SYMBOL(inet_stream_connect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
673/*
674 * Accept a pending connection. The TCP layer now gives BSD semantics.
675 */
676
677int inet_accept(struct socket *sock, struct socket *newsock, int flags)
678{
679 struct sock *sk1 = sock->sk;
680 int err = -EINVAL;
681 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
682
683 if (!sk2)
684 goto do_err;
685
686 lock_sock(sk2);
687
Eric Dumazet1eddcea2011-06-17 03:45:15 +0000688 sock_rps_record_flow(sk2);
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700689 WARN_ON(!((1 << sk2->sk_state) &
690 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
692 sock_graft(sk2, newsock);
693
694 newsock->state = SS_CONNECTED;
695 err = 0;
696 release_sock(sk2);
697do_err:
698 return err;
699}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700700EXPORT_SYMBOL(inet_accept);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
702
703/*
704 * This does both peername and sockname.
705 */
706int inet_getname(struct socket *sock, struct sockaddr *uaddr,
707 int *uaddr_len, int peer)
708{
709 struct sock *sk = sock->sk;
710 struct inet_sock *inet = inet_sk(sk);
Cyrill Gorcunov38bfd8f2009-10-29 02:59:18 -0700711 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 sin->sin_family = AF_INET;
714 if (peer) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000715 if (!inet->inet_dport ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
717 peer == 1))
718 return -ENOTCONN;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000719 sin->sin_port = inet->inet_dport;
720 sin->sin_addr.s_addr = inet->inet_daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 } else {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000722 __be32 addr = inet->inet_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 if (!addr)
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000724 addr = inet->inet_saddr;
725 sin->sin_port = inet->inet_sport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 sin->sin_addr.s_addr = addr;
727 }
728 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
729 *uaddr_len = sizeof(*sin);
730 return 0;
731}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700732EXPORT_SYMBOL(inet_getname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
734int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
735 size_t size)
736{
737 struct sock *sk = sock->sk;
738
David S. Millerc58dc012010-04-27 15:05:31 -0700739 sock_rps_record_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 /* We may need to bind the socket. */
Changli Gao7ba42912010-07-10 20:41:55 +0000742 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
743 inet_autobind(sk))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 return -EAGAIN;
745
746 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
747}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700748EXPORT_SYMBOL(inet_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Changli Gao7ba42912010-07-10 20:41:55 +0000750ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
751 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752{
753 struct sock *sk = sock->sk;
754
David S. Millerc58dc012010-04-27 15:05:31 -0700755 sock_rps_record_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700756
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 /* We may need to bind the socket. */
Changli Gao7ba42912010-07-10 20:41:55 +0000758 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
759 inet_autobind(sk))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 return -EAGAIN;
761
762 if (sk->sk_prot->sendpage)
763 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
764 return sock_no_sendpage(sock, page, offset, size, flags);
765}
Changli Gao7ba42912010-07-10 20:41:55 +0000766EXPORT_SYMBOL(inet_sendpage);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
Tom Herbertfec5e652010-04-16 16:01:27 -0700768int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
769 size_t size, int flags)
770{
771 struct sock *sk = sock->sk;
772 int addr_len = 0;
773 int err;
774
David S. Millerc58dc012010-04-27 15:05:31 -0700775 sock_rps_record_flow(sk);
Tom Herbertfec5e652010-04-16 16:01:27 -0700776
777 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
778 flags & ~MSG_DONTWAIT, &addr_len);
779 if (err >= 0)
780 msg->msg_namelen = addr_len;
781 return err;
782}
783EXPORT_SYMBOL(inet_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
785int inet_shutdown(struct socket *sock, int how)
786{
787 struct sock *sk = sock->sk;
788 int err = 0;
789
790 /* This should really check to make sure
791 * the socket is a TCP socket. (WHY AC...)
792 */
793 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
794 1->2 bit 2 snds.
795 2->3 */
796 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
797 return -EINVAL;
798
799 lock_sock(sk);
800 if (sock->state == SS_CONNECTING) {
801 if ((1 << sk->sk_state) &
802 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
803 sock->state = SS_DISCONNECTING;
804 else
805 sock->state = SS_CONNECTED;
806 }
807
808 switch (sk->sk_state) {
809 case TCP_CLOSE:
810 err = -ENOTCONN;
811 /* Hack to wake up other listeners, who can poll for
812 POLLHUP, even on eg. unconnected UDP sockets -- RR */
813 default:
814 sk->sk_shutdown |= how;
815 if (sk->sk_prot->shutdown)
816 sk->sk_prot->shutdown(sk, how);
817 break;
818
819 /* Remaining two branches are temporary solution for missing
820 * close() in multithreaded environment. It is _not_ a good idea,
821 * but we have no choice until close() is repaired at VFS level.
822 */
823 case TCP_LISTEN:
824 if (!(how & RCV_SHUTDOWN))
825 break;
826 /* Fall through */
827 case TCP_SYN_SENT:
828 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
829 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
830 break;
831 }
832
833 /* Wake up anyone sleeping in poll. */
834 sk->sk_state_change(sk);
835 release_sock(sk);
836 return err;
837}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700838EXPORT_SYMBOL(inet_shutdown);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
840/*
841 * ioctl() calls you can issue on an INET socket. Most of these are
842 * device configuration and stuff and very rarely used. Some ioctls
843 * pass on to the socket itself.
844 *
845 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
846 * loads the devconfigure module does its configuring and unloads it.
847 * There's a good 20K of config code hanging around the kernel.
848 */
849
850int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
851{
852 struct sock *sk = sock->sk;
853 int err = 0;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900854 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
856 switch (cmd) {
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700857 case SIOCGSTAMP:
858 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
859 break;
860 case SIOCGSTAMPNS:
861 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
862 break;
863 case SIOCADDRT:
864 case SIOCDELRT:
865 case SIOCRTMSG:
866 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
867 break;
868 case SIOCDARP:
869 case SIOCGARP:
870 case SIOCSARP:
871 err = arp_ioctl(net, cmd, (void __user *)arg);
872 break;
873 case SIOCGIFADDR:
874 case SIOCSIFADDR:
875 case SIOCGIFBRDADDR:
876 case SIOCSIFBRDADDR:
877 case SIOCGIFNETMASK:
878 case SIOCSIFNETMASK:
879 case SIOCGIFDSTADDR:
880 case SIOCSIFDSTADDR:
881 case SIOCSIFPFLAGS:
882 case SIOCGIFPFLAGS:
883 case SIOCSIFFLAGS:
884 err = devinet_ioctl(net, cmd, (void __user *)arg);
885 break;
886 default:
887 if (sk->sk_prot->ioctl)
888 err = sk->sk_prot->ioctl(sk, cmd, arg);
889 else
890 err = -ENOIOCTLCMD;
891 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 }
893 return err;
894}
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700895EXPORT_SYMBOL(inet_ioctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000897#ifdef CONFIG_COMPAT
Gerrit Renker686dc6b2011-10-15 09:26:56 +0000898static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000899{
900 struct sock *sk = sock->sk;
901 int err = -ENOIOCTLCMD;
902
903 if (sk->sk_prot->compat_ioctl)
904 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
905
906 return err;
907}
908#endif
909
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800910const struct proto_ops inet_stream_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800911 .family = PF_INET,
912 .owner = THIS_MODULE,
913 .release = inet_release,
914 .bind = inet_bind,
915 .connect = inet_stream_connect,
916 .socketpair = sock_no_socketpair,
917 .accept = inet_accept,
918 .getname = inet_getname,
919 .poll = tcp_poll,
920 .ioctl = inet_ioctl,
921 .listen = inet_listen,
922 .shutdown = inet_shutdown,
923 .setsockopt = sock_common_setsockopt,
924 .getsockopt = sock_common_getsockopt,
Changli Gao7ba42912010-07-10 20:41:55 +0000925 .sendmsg = inet_sendmsg,
Tom Herbertfec5e652010-04-16 16:01:27 -0700926 .recvmsg = inet_recvmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800927 .mmap = sock_no_mmap,
Changli Gao7ba42912010-07-10 20:41:55 +0000928 .sendpage = inet_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800929 .splice_read = tcp_splice_read,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800930#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800931 .compat_setsockopt = compat_sock_common_setsockopt,
932 .compat_getsockopt = compat_sock_common_getsockopt,
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000933 .compat_ioctl = inet_compat_ioctl,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800934#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935};
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700936EXPORT_SYMBOL(inet_stream_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800938const struct proto_ops inet_dgram_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800939 .family = PF_INET,
940 .owner = THIS_MODULE,
941 .release = inet_release,
942 .bind = inet_bind,
943 .connect = inet_dgram_connect,
944 .socketpair = sock_no_socketpair,
945 .accept = sock_no_accept,
946 .getname = inet_getname,
947 .poll = udp_poll,
948 .ioctl = inet_ioctl,
949 .listen = sock_no_listen,
950 .shutdown = inet_shutdown,
951 .setsockopt = sock_common_setsockopt,
952 .getsockopt = sock_common_getsockopt,
953 .sendmsg = inet_sendmsg,
Tom Herbertfec5e652010-04-16 16:01:27 -0700954 .recvmsg = inet_recvmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800955 .mmap = sock_no_mmap,
956 .sendpage = inet_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800957#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800958 .compat_setsockopt = compat_sock_common_setsockopt,
959 .compat_getsockopt = compat_sock_common_getsockopt,
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000960 .compat_ioctl = inet_compat_ioctl,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800961#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962};
Eric Dumazet3d1427f2009-08-28 23:45:21 -0700963EXPORT_SYMBOL(inet_dgram_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964
965/*
966 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
967 * udp_poll
968 */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800969static const struct proto_ops inet_sockraw_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800970 .family = PF_INET,
971 .owner = THIS_MODULE,
972 .release = inet_release,
973 .bind = inet_bind,
974 .connect = inet_dgram_connect,
975 .socketpair = sock_no_socketpair,
976 .accept = sock_no_accept,
977 .getname = inet_getname,
978 .poll = datagram_poll,
979 .ioctl = inet_ioctl,
980 .listen = sock_no_listen,
981 .shutdown = inet_shutdown,
982 .setsockopt = sock_common_setsockopt,
983 .getsockopt = sock_common_getsockopt,
984 .sendmsg = inet_sendmsg,
Tom Herbertfec5e652010-04-16 16:01:27 -0700985 .recvmsg = inet_recvmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800986 .mmap = sock_no_mmap,
987 .sendpage = inet_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800988#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800989 .compat_setsockopt = compat_sock_common_setsockopt,
990 .compat_getsockopt = compat_sock_common_getsockopt,
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000991 .compat_ioctl = inet_compat_ioctl,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800992#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993};
994
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +0000995static const struct net_proto_family inet_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 .family = PF_INET,
997 .create = inet_create,
998 .owner = THIS_MODULE,
999};
1000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001/* Upon startup we insert all the elements in inetsw_array[] into
1002 * the linked list inetsw.
1003 */
1004static struct inet_protosw inetsw_array[] =
1005{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001006 {
1007 .type = SOCK_STREAM,
1008 .protocol = IPPROTO_TCP,
1009 .prot = &tcp_prot,
1010 .ops = &inet_stream_ops,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001011 .no_check = 0,
1012 .flags = INET_PROTOSW_PERMANENT |
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001013 INET_PROTOSW_ICSK,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001014 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001016 {
1017 .type = SOCK_DGRAM,
1018 .protocol = IPPROTO_UDP,
1019 .prot = &udp_prot,
1020 .ops = &inet_dgram_ops,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001021 .no_check = UDP_CSUM_DEFAULT,
1022 .flags = INET_PROTOSW_PERMANENT,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 },
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001024
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001025 {
1026 .type = SOCK_DGRAM,
1027 .protocol = IPPROTO_ICMP,
1028 .prot = &ping_prot,
1029 .ops = &inet_dgram_ops,
1030 .no_check = UDP_CSUM_DEFAULT,
1031 .flags = INET_PROTOSW_REUSE,
1032 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
1034 {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001035 .type = SOCK_RAW,
1036 .protocol = IPPROTO_IP, /* wild card */
1037 .prot = &raw_prot,
1038 .ops = &inet_sockraw_ops,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001039 .no_check = UDP_CSUM_DEFAULT,
1040 .flags = INET_PROTOSW_REUSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 }
1042};
1043
Denis Chengc40f6ff2007-09-16 16:39:25 -07001044#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
1046void inet_register_protosw(struct inet_protosw *p)
1047{
1048 struct list_head *lh;
1049 struct inet_protosw *answer;
1050 int protocol = p->protocol;
1051 struct list_head *last_perm;
1052
1053 spin_lock_bh(&inetsw_lock);
1054
1055 if (p->type >= SOCK_MAX)
1056 goto out_illegal;
1057
1058 /* If we are trying to override a permanent protocol, bail. */
1059 answer = NULL;
1060 last_perm = &inetsw[p->type];
1061 list_for_each(lh, &inetsw[p->type]) {
1062 answer = list_entry(lh, struct inet_protosw, list);
1063
1064 /* Check only the non-wild match. */
1065 if (INET_PROTOSW_PERMANENT & answer->flags) {
1066 if (protocol == answer->protocol)
1067 break;
1068 last_perm = lh;
1069 }
1070
1071 answer = NULL;
1072 }
1073 if (answer)
1074 goto out_permanent;
1075
1076 /* Add the new entry after the last permanent entry if any, so that
1077 * the new entry does not override a permanent entry when matched with
1078 * a wild-card protocol. But it is allowed to override any existing
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001079 * non-permanent entry. This means that when we remove this entry, the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 * system automatically returns to the old behavior.
1081 */
1082 list_add_rcu(&p->list, last_perm);
1083out:
1084 spin_unlock_bh(&inetsw_lock);
1085
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 return;
1087
1088out_permanent:
Joe Perches058bd4d2012-03-11 18:36:11 +00001089 pr_err("Attempt to override permanent protocol %d\n", protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 goto out;
1091
1092out_illegal:
Joe Perches058bd4d2012-03-11 18:36:11 +00001093 pr_err("Ignoring attempt to register invalid socket type %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 p->type);
1095 goto out;
1096}
Eric Dumazet3d1427f2009-08-28 23:45:21 -07001097EXPORT_SYMBOL(inet_register_protosw);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098
1099void inet_unregister_protosw(struct inet_protosw *p)
1100{
1101 if (INET_PROTOSW_PERMANENT & p->flags) {
Joe Perches058bd4d2012-03-11 18:36:11 +00001102 pr_err("Attempt to unregister permanent protocol %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 p->protocol);
1104 } else {
1105 spin_lock_bh(&inetsw_lock);
1106 list_del_rcu(&p->list);
1107 spin_unlock_bh(&inetsw_lock);
1108
1109 synchronize_net();
1110 }
1111}
Eric Dumazet3d1427f2009-08-28 23:45:21 -07001112EXPORT_SYMBOL(inet_unregister_protosw);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001114/*
1115 * Shall we try to damage output packets if routing dev changes?
1116 */
1117
Brian Haleyab32ea52006-09-22 14:15:41 -07001118int sysctl_ip_dynaddr __read_mostly;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001119
1120static int inet_sk_reselect_saddr(struct sock *sk)
1121{
1122 struct inet_sock *inet = inet_sk(sk);
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001123 __be32 old_saddr = inet->inet_saddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001124 __be32 daddr = inet->inet_daddr;
David S. Miller6e869132011-05-06 16:18:04 -07001125 struct flowi4 *fl4;
David S. Millerb23dd4f2011-03-02 14:31:35 -08001126 struct rtable *rt;
1127 __be32 new_saddr;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001128 struct ip_options_rcu *inet_opt;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001129
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001130 inet_opt = rcu_dereference_protected(inet->inet_opt,
1131 sock_owned_by_user(sk));
1132 if (inet_opt && inet_opt->opt.srr)
1133 daddr = inet_opt->opt.faddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001134
1135 /* Query new route. */
David S. Miller6e869132011-05-06 16:18:04 -07001136 fl4 = &inet->cork.fl.u.ip4;
1137 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
David S. Millerb23dd4f2011-03-02 14:31:35 -08001138 sk->sk_bound_dev_if, sk->sk_protocol,
1139 inet->inet_sport, inet->inet_dport, sk, false);
1140 if (IS_ERR(rt))
1141 return PTR_ERR(rt);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001142
Changli Gaod8d1f302010-06-10 23:31:35 -07001143 sk_setup_caps(sk, &rt->dst);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001144
David S. Miller6e869132011-05-06 16:18:04 -07001145 new_saddr = fl4->saddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001146
1147 if (new_saddr == old_saddr)
1148 return 0;
1149
1150 if (sysctl_ip_dynaddr > 1) {
Joe Perches058bd4d2012-03-11 18:36:11 +00001151 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1152 __func__, &old_saddr, &new_saddr);
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001153 }
1154
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001155 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001156
1157 /*
1158 * XXX The only one ugly spot where we need to
1159 * XXX really change the sockets identity after
1160 * XXX it has entered the hashes. -DaveM
1161 *
1162 * Besides that, it does not check for connection
1163 * uniqueness. Wait for troubles.
1164 */
1165 __sk_prot_rehash(sk);
1166 return 0;
1167}
1168
1169int inet_sk_rebuild_header(struct sock *sk)
1170{
1171 struct inet_sock *inet = inet_sk(sk);
1172 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
Al Viro3ca3c682006-09-27 18:28:07 -07001173 __be32 daddr;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001174 struct ip_options_rcu *inet_opt;
David S. Miller6e869132011-05-06 16:18:04 -07001175 struct flowi4 *fl4;
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001176 int err;
1177
1178 /* Route is OK, nothing to do. */
1179 if (rt)
1180 return 0;
1181
1182 /* Reroute. */
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001183 rcu_read_lock();
1184 inet_opt = rcu_dereference(inet->inet_opt);
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001185 daddr = inet->inet_daddr;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001186 if (inet_opt && inet_opt->opt.srr)
1187 daddr = inet_opt->opt.faddr;
1188 rcu_read_unlock();
David S. Miller6e869132011-05-06 16:18:04 -07001189 fl4 = &inet->cork.fl.u.ip4;
1190 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
David S. Miller78fbfd82011-03-12 00:00:52 -05001191 inet->inet_dport, inet->inet_sport,
1192 sk->sk_protocol, RT_CONN_FLAGS(sk),
1193 sk->sk_bound_dev_if);
David S. Millerb23dd4f2011-03-02 14:31:35 -08001194 if (!IS_ERR(rt)) {
1195 err = 0;
Changli Gaod8d1f302010-06-10 23:31:35 -07001196 sk_setup_caps(sk, &rt->dst);
David S. Millerb23dd4f2011-03-02 14:31:35 -08001197 } else {
1198 err = PTR_ERR(rt);
1199
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001200 /* Routing failed... */
1201 sk->sk_route_caps = 0;
1202 /*
1203 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1204 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1205 */
1206 if (!sysctl_ip_dynaddr ||
1207 sk->sk_state != TCP_SYN_SENT ||
1208 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1209 (err = inet_sk_reselect_saddr(sk)) != 0)
1210 sk->sk_err_soft = -err;
1211 }
1212
1213 return err;
1214}
Arnaldo Carvalho de Melo32519f12005-08-09 19:50:02 -07001215EXPORT_SYMBOL(inet_sk_rebuild_header);
1216
Herbert Xua430a432006-07-08 13:34:56 -07001217static int inet_gso_send_check(struct sk_buff *skb)
1218{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001219 const struct iphdr *iph;
Alexey Dobriyan32613092009-09-14 12:21:47 +00001220 const struct net_protocol *ops;
Herbert Xua430a432006-07-08 13:34:56 -07001221 int proto;
1222 int ihl;
1223 int err = -EINVAL;
1224
1225 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1226 goto out;
1227
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001228 iph = ip_hdr(skb);
Herbert Xua430a432006-07-08 13:34:56 -07001229 ihl = iph->ihl * 4;
1230 if (ihl < sizeof(*iph))
1231 goto out;
1232
1233 if (unlikely(!pskb_may_pull(skb, ihl)))
1234 goto out;
1235
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001236 __skb_pull(skb, ihl);
1237 skb_reset_transport_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001238 iph = ip_hdr(skb);
Herbert Xua430a432006-07-08 13:34:56 -07001239 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1240 err = -EPROTONOSUPPORT;
1241
1242 rcu_read_lock();
1243 ops = rcu_dereference(inet_protos[proto]);
1244 if (likely(ops && ops->gso_send_check))
1245 err = ops->gso_send_check(skb);
1246 rcu_read_unlock();
1247
1248out:
1249 return err;
1250}
1251
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001252static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1253 netdev_features_t features)
Herbert Xuf4c50d92006-06-22 03:02:40 -07001254{
1255 struct sk_buff *segs = ERR_PTR(-EINVAL);
1256 struct iphdr *iph;
Alexey Dobriyan32613092009-09-14 12:21:47 +00001257 const struct net_protocol *ops;
Herbert Xuf4c50d92006-06-22 03:02:40 -07001258 int proto;
1259 int ihl;
1260 int id;
Sridhar Samudralad7ca4cc2009-07-09 08:09:47 +00001261 unsigned int offset = 0;
Herbert Xuf4c50d92006-06-22 03:02:40 -07001262
Stephen Hemmingerd212f872007-06-27 00:47:37 -07001263 if (!(features & NETIF_F_V4_CSUM))
1264 features &= ~NETIF_F_SG;
1265
Herbert Xubbcf4672006-07-03 19:38:35 -07001266 if (unlikely(skb_shinfo(skb)->gso_type &
1267 ~(SKB_GSO_TCPV4 |
1268 SKB_GSO_UDP |
1269 SKB_GSO_DODGY |
1270 SKB_GSO_TCP_ECN |
1271 0)))
1272 goto out;
1273
1274 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001275 goto out;
1276
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001277 iph = ip_hdr(skb);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001278 ihl = iph->ihl * 4;
1279 if (ihl < sizeof(*iph))
1280 goto out;
1281
Herbert Xubbcf4672006-07-03 19:38:35 -07001282 if (unlikely(!pskb_may_pull(skb, ihl)))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001283 goto out;
1284
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001285 __skb_pull(skb, ihl);
1286 skb_reset_transport_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001287 iph = ip_hdr(skb);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001288 id = ntohs(iph->id);
1289 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1290 segs = ERR_PTR(-EPROTONOSUPPORT);
1291
1292 rcu_read_lock();
1293 ops = rcu_dereference(inet_protos[proto]);
Herbert Xubbcf4672006-07-03 19:38:35 -07001294 if (likely(ops && ops->gso_segment))
Herbert Xu576a30e2006-06-27 13:22:38 -07001295 segs = ops->gso_segment(skb, features);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001296 rcu_read_unlock();
1297
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001298 if (!segs || IS_ERR(segs))
Herbert Xuf4c50d92006-06-22 03:02:40 -07001299 goto out;
1300
1301 skb = segs;
1302 do {
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001303 iph = ip_hdr(skb);
Sridhar Samudralad7ca4cc2009-07-09 08:09:47 +00001304 if (proto == IPPROTO_UDP) {
1305 iph->id = htons(id);
1306 iph->frag_off = htons(offset >> 3);
1307 if (skb->next != NULL)
1308 iph->frag_off |= htons(IP_MF);
1309 offset += (skb->len - skb->mac_len - iph->ihl * 4);
1310 } else
1311 iph->id = htons(id++);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001312 iph->tot_len = htons(skb->len - skb->mac_len);
1313 iph->check = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001314 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
Herbert Xuf4c50d92006-06-22 03:02:40 -07001315 } while ((skb = skb->next));
1316
1317out:
1318 return segs;
1319}
1320
Herbert Xu73cc19f2008-12-15 23:41:09 -08001321static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1322 struct sk_buff *skb)
1323{
Alexey Dobriyan32613092009-09-14 12:21:47 +00001324 const struct net_protocol *ops;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001325 struct sk_buff **pp = NULL;
1326 struct sk_buff *p;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001327 const struct iphdr *iph;
Herbert Xua5b1cf22009-05-26 18:50:28 +00001328 unsigned int hlen;
1329 unsigned int off;
Herbert Xu1075f3f2009-05-26 18:50:29 +00001330 unsigned int id;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001331 int flush = 1;
1332 int proto;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001333
Herbert Xua5b1cf22009-05-26 18:50:28 +00001334 off = skb_gro_offset(skb);
1335 hlen = off + sizeof(*iph);
1336 iph = skb_gro_header_fast(skb, off);
1337 if (skb_gro_header_hard(skb, hlen)) {
1338 iph = skb_gro_header_slow(skb, hlen, off);
1339 if (unlikely(!iph))
1340 goto out;
1341 }
Herbert Xu73cc19f2008-12-15 23:41:09 -08001342
Herbert Xu73cc19f2008-12-15 23:41:09 -08001343 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1344
1345 rcu_read_lock();
1346 ops = rcu_dereference(inet_protos[proto]);
1347 if (!ops || !ops->gro_receive)
1348 goto out_unlock;
1349
Herbert Xua5ad24b2009-02-08 18:00:39 +00001350 if (*(u8 *)iph != 0x45)
Herbert Xu73cc19f2008-12-15 23:41:09 -08001351 goto out_unlock;
1352
1353 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1354 goto out_unlock;
1355
Eric Dumazet0eae88f2010-04-20 19:06:52 -07001356 id = ntohl(*(__be32 *)&iph->id);
1357 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
Herbert Xu1075f3f2009-05-26 18:50:29 +00001358 id >>= 16;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001359
1360 for (p = *head; p; p = p->next) {
1361 struct iphdr *iph2;
1362
1363 if (!NAPI_GRO_CB(p)->same_flow)
1364 continue;
1365
1366 iph2 = ip_hdr(p);
1367
Herbert Xua5ad24b2009-02-08 18:00:39 +00001368 if ((iph->protocol ^ iph2->protocol) |
1369 (iph->tos ^ iph2->tos) |
Eric Dumazet0eae88f2010-04-20 19:06:52 -07001370 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1371 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
Herbert Xu73cc19f2008-12-15 23:41:09 -08001372 NAPI_GRO_CB(p)->same_flow = 0;
1373 continue;
1374 }
1375
1376 /* All fields must match except length and checksum. */
1377 NAPI_GRO_CB(p)->flush |=
Herbert Xua5ad24b2009-02-08 18:00:39 +00001378 (iph->ttl ^ iph2->ttl) |
1379 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
Herbert Xu73cc19f2008-12-15 23:41:09 -08001380
1381 NAPI_GRO_CB(p)->flush |= flush;
1382 }
1383
1384 NAPI_GRO_CB(skb)->flush |= flush;
Herbert Xu86911732009-01-29 14:19:50 +00001385 skb_gro_pull(skb, sizeof(*iph));
1386 skb_set_transport_header(skb, skb_gro_offset(skb));
Herbert Xu73cc19f2008-12-15 23:41:09 -08001387
1388 pp = ops->gro_receive(head, skb);
1389
1390out_unlock:
1391 rcu_read_unlock();
1392
1393out:
1394 NAPI_GRO_CB(skb)->flush |= flush;
1395
1396 return pp;
1397}
1398
1399static int inet_gro_complete(struct sk_buff *skb)
1400{
Alexey Dobriyan32613092009-09-14 12:21:47 +00001401 const struct net_protocol *ops;
Herbert Xu73cc19f2008-12-15 23:41:09 -08001402 struct iphdr *iph = ip_hdr(skb);
1403 int proto = iph->protocol & (MAX_INET_PROTOS - 1);
1404 int err = -ENOSYS;
1405 __be16 newlen = htons(skb->len - skb_network_offset(skb));
1406
1407 csum_replace2(&iph->check, iph->tot_len, newlen);
1408 iph->tot_len = newlen;
1409
1410 rcu_read_lock();
1411 ops = rcu_dereference(inet_protos[proto]);
1412 if (WARN_ON(!ops || !ops->gro_complete))
1413 goto out_unlock;
1414
1415 err = ops->gro_complete(skb);
1416
1417out_unlock:
1418 rcu_read_unlock();
1419
1420 return err;
1421}
1422
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001423int inet_ctl_sock_create(struct sock **sk, unsigned short family,
Denis V. Lunev56772422008-04-03 14:28:30 -07001424 unsigned short type, unsigned char protocol,
1425 struct net *net)
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001426{
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001427 struct socket *sock;
1428 int rc = sock_create_kern(family, type, protocol, &sock);
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001429
1430 if (rc == 0) {
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001431 *sk = sock->sk;
1432 (*sk)->sk_allocation = GFP_ATOMIC;
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001433 /*
1434 * Unhash it so that IP input processing does not even see it,
1435 * we do not wish this socket to see incoming packets.
1436 */
Denis V. Luneveee4fe42008-04-03 14:27:58 -07001437 (*sk)->sk_prot->unhash(*sk);
Denis V. Lunev56772422008-04-03 14:28:30 -07001438
1439 sk_change_net(*sk, net);
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001440 }
1441 return rc;
1442}
Denis V. Lunev3d58b5f2008-04-03 14:22:32 -07001443EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1444
Tejun Heo7d720c32010-02-16 15:20:26 +00001445unsigned long snmp_fold_field(void __percpu *mib[], int offt)
Herbert Xu5e0f0432007-04-24 21:53:35 -07001446{
1447 unsigned long res = 0;
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001448 int i, j;
Herbert Xu5e0f0432007-04-24 21:53:35 -07001449
1450 for_each_possible_cpu(i) {
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001451 for (j = 0; j < SNMP_ARRAY_SZ; j++)
1452 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt);
Herbert Xu5e0f0432007-04-24 21:53:35 -07001453 }
1454 return res;
1455}
1456EXPORT_SYMBOL_GPL(snmp_fold_field);
1457
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001458#if BITS_PER_LONG==32
1459
1460u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset)
1461{
1462 u64 res = 0;
1463 int cpu;
1464
1465 for_each_possible_cpu(cpu) {
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001466 void *bhptr;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001467 struct u64_stats_sync *syncp;
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001468 u64 v;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001469 unsigned int start;
1470
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001471 bhptr = per_cpu_ptr(mib[0], cpu);
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001472 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1473 do {
1474 start = u64_stats_fetch_begin_bh(syncp);
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001475 v = *(((u64 *) bhptr) + offt);
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001476 } while (u64_stats_fetch_retry_bh(syncp, start));
1477
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001478 res += v;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07001479 }
1480 return res;
1481}
1482EXPORT_SYMBOL_GPL(snmp_fold_field64);
1483#endif
1484
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001485int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align)
Herbert Xu5e0f0432007-04-24 21:53:35 -07001486{
1487 BUG_ON(ptr == NULL);
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001488 ptr[0] = __alloc_percpu(mibsize, align);
Herbert Xu5e0f0432007-04-24 21:53:35 -07001489 if (!ptr[0])
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001490 return -ENOMEM;
1491#if SNMP_ARRAY_SZ == 2
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001492 ptr[1] = __alloc_percpu(mibsize, align);
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001493 if (!ptr[1]) {
1494 free_percpu(ptr[0]);
1495 ptr[0] = NULL;
1496 return -ENOMEM;
1497 }
1498#endif
Herbert Xu5e0f0432007-04-24 21:53:35 -07001499 return 0;
Herbert Xu5e0f0432007-04-24 21:53:35 -07001500}
1501EXPORT_SYMBOL_GPL(snmp_mib_init);
1502
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001503void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ])
Herbert Xu5e0f0432007-04-24 21:53:35 -07001504{
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001505 int i;
1506
Herbert Xu5e0f0432007-04-24 21:53:35 -07001507 BUG_ON(ptr == NULL);
Eric Dumazet8f0ea0f2011-06-10 19:45:51 +00001508 for (i = 0; i < SNMP_ARRAY_SZ; i++) {
1509 free_percpu(ptr[i]);
1510 ptr[i] = NULL;
1511 }
Herbert Xu5e0f0432007-04-24 21:53:35 -07001512}
1513EXPORT_SYMBOL_GPL(snmp_mib_free);
1514
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515#ifdef CONFIG_IP_MULTICAST
Alexey Dobriyan32613092009-09-14 12:21:47 +00001516static const struct net_protocol igmp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 .handler = igmp_rcv,
Alexey Dobriyanb4ee07d2008-12-25 16:42:23 -08001518 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519};
1520#endif
1521
Alexey Dobriyan32613092009-09-14 12:21:47 +00001522static const struct net_protocol tcp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 .handler = tcp_v4_rcv,
1524 .err_handler = tcp_v4_err,
Herbert Xua430a432006-07-08 13:34:56 -07001525 .gso_send_check = tcp_v4_gso_send_check,
Herbert Xuf4c50d92006-06-22 03:02:40 -07001526 .gso_segment = tcp_tso_segment,
Herbert Xubf296b12008-12-15 23:43:36 -08001527 .gro_receive = tcp4_gro_receive,
1528 .gro_complete = tcp4_gro_complete,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001530 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531};
1532
Alexey Dobriyan32613092009-09-14 12:21:47 +00001533static const struct net_protocol udp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 .handler = udp_rcv,
1535 .err_handler = udp_err,
Sridhar Samudralad7ca4cc2009-07-09 08:09:47 +00001536 .gso_send_check = udp4_ufo_send_check,
1537 .gso_segment = udp4_ufo_fragment,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001539 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540};
1541
Alexey Dobriyan32613092009-09-14 12:21:47 +00001542static const struct net_protocol icmp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 .handler = icmp_rcv,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001544 .err_handler = ping_err,
Herbert Xu8b7817f2007-12-12 10:44:43 -08001545 .no_policy = 1,
Denis V. Lunev92f1fec2008-03-24 15:34:06 -07001546 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547};
1548
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001549static __net_init int ipv4_mib_init_net(struct net *net)
1550{
Tejun Heo7d720c32010-02-16 15:20:26 +00001551 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001552 sizeof(struct tcp_mib),
1553 __alignof__(struct tcp_mib)) < 0)
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001554 goto err_tcp_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001555 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001556 sizeof(struct ipstats_mib),
1557 __alignof__(struct ipstats_mib)) < 0)
Pavel Emelyanova20f5792008-07-18 04:02:42 -07001558 goto err_ip_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001559 if (snmp_mib_init((void __percpu **)net->mib.net_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001560 sizeof(struct linux_mib),
1561 __alignof__(struct linux_mib)) < 0)
Pavel Emelyanov61a7e262008-07-18 04:03:08 -07001562 goto err_net_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001563 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001564 sizeof(struct udp_mib),
1565 __alignof__(struct udp_mib)) < 0)
Pavel Emelyanov2f275f92008-07-18 04:03:27 -07001566 goto err_udp_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001567 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001568 sizeof(struct udp_mib),
1569 __alignof__(struct udp_mib)) < 0)
Pavel Emelyanov386019d2008-07-18 04:03:45 -07001570 goto err_udplite_mib;
Tejun Heo7d720c32010-02-16 15:20:26 +00001571 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001572 sizeof(struct icmp_mib),
1573 __alignof__(struct icmp_mib)) < 0)
Pavel Emelyanovb60538a2008-07-18 04:04:02 -07001574 goto err_icmp_mib;
Eric Dumazetacb32ba2011-11-08 13:04:43 +00001575 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1576 GFP_KERNEL);
1577 if (!net->mib.icmpmsg_statistics)
Pavel Emelyanov923c6582008-07-18 04:04:22 -07001578 goto err_icmpmsg_mib;
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001579
1580 tcp_mib_init(net);
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001581 return 0;
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001582
Pavel Emelyanov923c6582008-07-18 04:04:22 -07001583err_icmpmsg_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001584 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
Pavel Emelyanovb60538a2008-07-18 04:04:02 -07001585err_icmp_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001586 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
Pavel Emelyanov386019d2008-07-18 04:03:45 -07001587err_udplite_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001588 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
Pavel Emelyanov2f275f92008-07-18 04:03:27 -07001589err_udp_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001590 snmp_mib_free((void __percpu **)net->mib.net_statistics);
Pavel Emelyanov61a7e262008-07-18 04:03:08 -07001591err_net_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001592 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
Pavel Emelyanova20f5792008-07-18 04:02:42 -07001593err_ip_mib:
Tejun Heo7d720c32010-02-16 15:20:26 +00001594 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
Pavel Emelyanov57ef42d2008-07-18 04:02:08 -07001595err_tcp_mib:
1596 return -ENOMEM;
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001597}
1598
1599static __net_exit void ipv4_mib_exit_net(struct net *net)
1600{
Eric Dumazetacb32ba2011-11-08 13:04:43 +00001601 kfree(net->mib.icmpmsg_statistics);
Tejun Heo7d720c32010-02-16 15:20:26 +00001602 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1603 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1604 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1605 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1606 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1607 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
Pavel Emelyanov9b4661b2008-07-18 04:01:44 -07001608}
1609
1610static __net_initdata struct pernet_operations ipv4_mib_ops = {
1611 .init = ipv4_mib_init_net,
1612 .exit = ipv4_mib_exit_net,
1613};
1614
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615static int __init init_ipv4_mibs(void)
1616{
Pavel Emelyanovd89cbbb2008-07-18 04:04:51 -07001617 return register_pernet_subsys(&ipv4_mib_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618}
1619
1620static int ipv4_proc_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621
Herbert Xu30e224d2005-07-05 14:40:10 -07001622/*
1623 * IP protocol layer initialiser
1624 */
1625
Stephen Hemminger7546dd92009-03-09 08:18:29 +00001626static struct packet_type ip_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -08001627 .type = cpu_to_be16(ETH_P_IP),
Herbert Xu30e224d2005-07-05 14:40:10 -07001628 .func = ip_rcv,
Herbert Xua430a432006-07-08 13:34:56 -07001629 .gso_send_check = inet_gso_send_check,
Herbert Xuf4c50d92006-06-22 03:02:40 -07001630 .gso_segment = inet_gso_segment,
Herbert Xu73cc19f2008-12-15 23:41:09 -08001631 .gro_receive = inet_gro_receive,
1632 .gro_complete = inet_gro_complete,
Herbert Xu30e224d2005-07-05 14:40:10 -07001633};
1634
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635static int __init inet_init(void)
1636{
1637 struct sk_buff *dummy_skb;
1638 struct inet_protosw *q;
1639 struct list_head *r;
1640 int rc = -EINVAL;
1641
YOSHIFUJI Hideakief047f52006-09-01 00:29:06 -07001642 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643
Amerigo Wange3826f12010-05-05 00:27:06 +00001644 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1645 if (!sysctl_local_reserved_ports)
1646 goto out;
1647
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 rc = proto_register(&tcp_prot, 1);
1649 if (rc)
Amerigo Wange3826f12010-05-05 00:27:06 +00001650 goto out_free_reserved_ports;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651
1652 rc = proto_register(&udp_prot, 1);
1653 if (rc)
1654 goto out_unregister_tcp_proto;
1655
1656 rc = proto_register(&raw_prot, 1);
1657 if (rc)
1658 goto out_unregister_udp_proto;
1659
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001660 rc = proto_register(&ping_prot, 1);
1661 if (rc)
1662 goto out_unregister_raw_proto;
1663
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001665 * Tell SOCKET that we are alive...
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 */
1667
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001668 (void)sock_register(&inet_family_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669
Al Virobd7b1532008-07-15 16:00:59 -04001670#ifdef CONFIG_SYSCTL
1671 ip_static_sysctl_init();
1672#endif
1673
Glauber Costa3dc43e32011-12-11 21:47:05 +00001674 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
1675
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 /*
1677 * Add all the base protocols.
1678 */
1679
1680 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
Joe Perches058bd4d2012-03-11 18:36:11 +00001681 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
Joe Perches058bd4d2012-03-11 18:36:11 +00001683 pr_crit("%s: Cannot add UDP protocol\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
Joe Perches058bd4d2012-03-11 18:36:11 +00001685 pr_crit("%s: Cannot add TCP protocol\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686#ifdef CONFIG_IP_MULTICAST
1687 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
Joe Perches058bd4d2012-03-11 18:36:11 +00001688 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689#endif
1690
1691 /* Register the socket-side information for inet_create. */
1692 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1693 INIT_LIST_HEAD(r);
1694
1695 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1696 inet_register_protosw(q);
1697
1698 /*
1699 * Set the ARP module up
1700 */
1701
1702 arp_init();
1703
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001704 /*
1705 * Set the IP module up
1706 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707
1708 ip_init();
1709
Denis V. Lunev9b0f9762008-02-29 11:13:15 -08001710 tcp_v4_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711
1712 /* Setup TCP slab cache for open requests. */
1713 tcp_init();
1714
Hideo Aoki95766ff2007-12-31 00:29:24 -08001715 /* Setup UDP memory threshold */
1716 udp_init();
1717
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001718 /* Add UDP-Lite (RFC 3828) */
1719 udplite4_register();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001721 ping_init();
1722
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 /*
1724 * Set the ICMP layer up
1725 */
1726
Denis V. Luneva5710d62008-02-29 11:14:50 -08001727 if (icmp_init() < 0)
1728 panic("Failed to create the ICMP control socket.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729
1730 /*
1731 * Initialise the multicast router
1732 */
1733#if defined(CONFIG_IP_MROUTE)
Wang Chen03d2f892008-07-03 12:13:36 +08001734 if (ip_mr_init())
Joe Perches058bd4d2012-03-11 18:36:11 +00001735 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736#endif
1737 /*
1738 * Initialise per-cpu ipv4 mibs
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001739 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740
Stephen Hemminger132adf52007-03-08 20:44:43 -08001741 if (init_ipv4_mibs())
Joe Perches058bd4d2012-03-11 18:36:11 +00001742 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001743
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 ipv4_proc_init();
1745
1746 ipfrag_init();
1747
Herbert Xu30e224d2005-07-05 14:40:10 -07001748 dev_add_pack(&ip_packet_type);
1749
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 rc = 0;
1751out:
1752 return rc;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001753out_unregister_raw_proto:
1754 proto_unregister(&raw_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755out_unregister_udp_proto:
1756 proto_unregister(&udp_prot);
Olaf Kirch321efff2006-09-27 16:33:45 -07001757out_unregister_tcp_proto:
1758 proto_unregister(&tcp_prot);
Amerigo Wange3826f12010-05-05 00:27:06 +00001759out_free_reserved_ports:
1760 kfree(sysctl_local_reserved_ports);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 goto out;
1762}
1763
Heiko Carstensa536e072006-04-28 15:19:17 -07001764fs_initcall(inet_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765
1766/* ------------------------------------------------------------------------ */
1767
1768#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769static int __init ipv4_proc_init(void)
1770{
1771 int rc = 0;
1772
1773 if (raw_proc_init())
1774 goto out_raw;
1775 if (tcp4_proc_init())
1776 goto out_tcp;
1777 if (udp4_proc_init())
1778 goto out_udp;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001779 if (ping_proc_init())
1780 goto out_ping;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 if (ip_misc_proc_init())
1782 goto out_misc;
1783out:
1784 return rc;
1785out_misc:
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001786 ping_proc_exit();
1787out_ping:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 udp4_proc_exit();
1789out_udp:
1790 tcp4_proc_exit();
1791out_tcp:
1792 raw_proc_exit();
1793out_raw:
1794 rc = -ENOMEM;
1795 goto out;
1796}
1797
1798#else /* CONFIG_PROC_FS */
1799static int __init ipv4_proc_init(void)
1800{
1801 return 0;
1802}
1803#endif /* CONFIG_PROC_FS */
1804
1805MODULE_ALIAS_NETPROTO(PF_INET);
1806