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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 * Authors: Ross Biro
9 * 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
68#include <linux/err.h>
69#include <linux/errno.h>
70#include <linux/types.h>
71#include <linux/socket.h>
72#include <linux/in.h>
73#include <linux/kernel.h>
74#include <linux/module.h>
75#include <linux/sched.h>
76#include <linux/timer.h>
77#include <linux/string.h>
78#include <linux/sockios.h>
79#include <linux/net.h>
80#include <linux/capability.h>
81#include <linux/fcntl.h>
82#include <linux/mm.h>
83#include <linux/interrupt.h>
84#include <linux/stat.h>
85#include <linux/init.h>
86#include <linux/poll.h>
87#include <linux/netfilter_ipv4.h>
88#include <linux/random.h>
89#include <linux/slab.h>
90
91#include <asm/uaccess.h>
92#include <asm/system.h>
93
94#include <linux/inet.h>
95#include <linux/igmp.h>
96#include <linux/inetdevice.h>
97#include <linux/netdevice.h>
98#include <net/checksum.h>
99#include <net/ip.h>
100#include <net/protocol.h>
101#include <net/arp.h>
102#include <net/route.h>
103#include <net/ip_fib.h>
104#include <net/inet_connection_sock.h>
105#include <net/tcp.h>
106#include <net/udp.h>
107#include <net/udplite.h>
108#include <linux/skbuff.h>
109#include <net/sock.h>
110#include <net/raw.h>
111#include <net/icmp.h>
112#include <net/ipip.h>
113#include <net/inet_common.h>
114#include <net/xfrm.h>
115#include <net/net_namespace.h>
116#ifdef CONFIG_IP_MROUTE
117#include <linux/mroute.h>
118#endif
119
120
121/* The inetsw table contains everything that inet_create needs to
122 * build a new socket.
123 */
124static struct list_head inetsw[SOCK_MAX];
125static DEFINE_SPINLOCK(inetsw_lock);
126
127struct ipv4_config ipv4_config;
128EXPORT_SYMBOL(ipv4_config);
129
130/* New destruction routine */
131
132void inet_sock_destruct(struct sock *sk)
133{
134 struct inet_sock *inet = inet_sk(sk);
135
136 __skb_queue_purge(&sk->sk_receive_queue);
137 __skb_queue_purge(&sk->sk_error_queue);
138
139 sk_mem_reclaim(sk);
140
141 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
142 pr_err("Attempt to release TCP socket in state %d %p\n",
143 sk->sk_state, sk);
144 return;
145 }
146 if (!sock_flag(sk, SOCK_DEAD)) {
147 pr_err("Attempt to release alive inet socket %p\n", sk);
148 return;
149 }
150
151 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
152 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
153 WARN_ON(sk->sk_wmem_queued);
154 WARN_ON(sk->sk_forward_alloc);
155
156 kfree(inet->opt);
157 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
158 sk_refcnt_debug_dec(sk);
159}
160EXPORT_SYMBOL(inet_sock_destruct);
161
162/*
163 * The routines beyond this point handle the behaviour of an AF_INET
164 * socket object. Mostly it punts to the subprotocols of IP to do
165 * the work.
166 */
167
168/*
169 * Automatically bind an unbound socket.
170 */
171
172static int inet_autobind(struct sock *sk)
173{
174 struct inet_sock *inet;
175 /* We may need to bind the socket. */
176 lock_sock(sk);
177 inet = inet_sk(sk);
178 if (!inet->inet_num) {
179 if (sk->sk_prot->get_port(sk, 0)) {
180 release_sock(sk);
181 return -EAGAIN;
182 }
183 inet->inet_sport = htons(inet->inet_num);
184 }
185 release_sock(sk);
186 return 0;
187}
188
189/*
190 * Move a socket into listening state.
191 */
192int inet_listen(struct socket *sock, int backlog)
193{
194 struct sock *sk = sock->sk;
195 unsigned char old_state;
196 int err;
197
198 lock_sock(sk);
199
200 err = -EINVAL;
201 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
202 goto out;
203
204 old_state = sk->sk_state;
205 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
206 goto out;
207
208 /* Really, if the socket is already in listen state
209 * we can only allow the backlog to be adjusted.
210 */
211 if (old_state != TCP_LISTEN) {
212 err = inet_csk_listen_start(sk, backlog);
213 if (err)
214 goto out;
215 }
216 sk->sk_max_ack_backlog = backlog;
217 err = 0;
218
219out:
220 release_sock(sk);
221 return err;
222}
223EXPORT_SYMBOL(inet_listen);
224
225u32 inet_ehash_secret __read_mostly;
226EXPORT_SYMBOL(inet_ehash_secret);
227
228/*
229 * inet_ehash_secret must be set exactly once
230 */
231void build_ehash_secret(void)
232{
233 u32 rnd;
234
235 do {
236 get_random_bytes(&rnd, sizeof(rnd));
237 } while (rnd == 0);
238
239 cmpxchg(&inet_ehash_secret, 0, rnd);
240}
241EXPORT_SYMBOL(build_ehash_secret);
242
243static inline int inet_netns_ok(struct net *net, int protocol)
244{
245 int hash;
246 const struct net_protocol *ipprot;
247
248 if (net_eq(net, &init_net))
249 return 1;
250
251 hash = protocol & (MAX_INET_PROTOS - 1);
252 ipprot = rcu_dereference(inet_protos[hash]);
253
254 if (ipprot == NULL)
255 /* raw IP is OK */
256 return 1;
257 return ipprot->netns_ok;
258}
259
260/*
261 * Create an inet socket.
262 */
263
264static int inet_create(struct net *net, struct socket *sock, int protocol,
265 int kern)
266{
267 struct sock *sk;
268 struct inet_protosw *answer;
269 struct inet_sock *inet;
270 struct proto *answer_prot;
271 unsigned char answer_flags;
272 char answer_no_check;
273 int try_loading_module = 0;
274 int err;
275
276 if (unlikely(!inet_ehash_secret))
277 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
278 build_ehash_secret();
279
280 sock->state = SS_UNCONNECTED;
281
282 /* Look for the requested type/protocol pair. */
283lookup_protocol:
284 err = -ESOCKTNOSUPPORT;
285 rcu_read_lock();
286 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
287
288 err = 0;
289 /* Check the non-wild match. */
290 if (protocol == answer->protocol) {
291 if (protocol != IPPROTO_IP)
292 break;
293 } else {
294 /* Check for the two wild cases. */
295 if (IPPROTO_IP == protocol) {
296 protocol = answer->protocol;
297 break;
298 }
299 if (IPPROTO_IP == answer->protocol)
300 break;
301 }
302 err = -EPROTONOSUPPORT;
303 }
304
305 if (unlikely(err)) {
306 if (try_loading_module < 2) {
307 rcu_read_unlock();
308 /*
309 * Be more specific, e.g. net-pf-2-proto-132-type-1
310 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
311 */
312 if (++try_loading_module == 1)
313 request_module("net-pf-%d-proto-%d-type-%d",
314 PF_INET, protocol, sock->type);
315 /*
316 * Fall back to generic, e.g. net-pf-2-proto-132
317 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
318 */
319 else
320 request_module("net-pf-%d-proto-%d",
321 PF_INET, protocol);
322 goto lookup_protocol;
323 } else
324 goto out_rcu_unlock;
325 }
326
327 err = -EPERM;
328 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
329 goto out_rcu_unlock;
330
331 err = -EAFNOSUPPORT;
332 if (!inet_netns_ok(net, protocol))
333 goto out_rcu_unlock;
334
335 sock->ops = answer->ops;
336 answer_prot = answer->prot;
337 answer_no_check = answer->no_check;
338 answer_flags = answer->flags;
339 rcu_read_unlock();
340
341 WARN_ON(answer_prot->slab == NULL);
342
343 err = -ENOBUFS;
344 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
345 if (sk == NULL)
346 goto out;
347
348 err = 0;
349 sk->sk_no_check = answer_no_check;
350 if (INET_PROTOSW_REUSE & answer_flags)
351 sk->sk_reuse = 1;
352
353 inet = inet_sk(sk);
354 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
355
356 inet->nodefrag = 0;
357
358 if (SOCK_RAW == sock->type) {
359 inet->inet_num = protocol;
360 if (IPPROTO_RAW == protocol)
361 inet->hdrincl = 1;
362 }
363
364 if (ipv4_config.no_pmtu_disc)
365 inet->pmtudisc = IP_PMTUDISC_DONT;
366 else
367 inet->pmtudisc = IP_PMTUDISC_WANT;
368
369 inet->inet_id = 0;
370
371 sock_init_data(sock, sk);
372
373 sk->sk_destruct = inet_sock_destruct;
374 sk->sk_protocol = protocol;
375 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
376
377 inet->uc_ttl = -1;
378 inet->mc_loop = 1;
379 inet->mc_ttl = 1;
380 inet->mc_all = 1;
381 inet->mc_index = 0;
382 inet->mc_list = NULL;
383
384 sk_refcnt_debug_inc(sk);
385
386 if (inet->inet_num) {
387 /* It assumes that any protocol which allows
388 * the user to assign a number at socket
389 * creation time automatically
390 * shares.
391 */
392 inet->inet_sport = htons(inet->inet_num);
393 /* Add to protocol hash chains. */
394 sk->sk_prot->hash(sk);
395 }
396
397 if (sk->sk_prot->init) {
398 err = sk->sk_prot->init(sk);
399 if (err)
400 sk_common_release(sk);
401 }
402out:
403 return err;
404out_rcu_unlock:
405 rcu_read_unlock();
406 goto out;
407}
408
409
410/*
411 * The peer socket should always be NULL (or else). When we call this
412 * function we are destroying the object and from then on nobody
413 * should refer to it.
414 */
415int inet_release(struct socket *sock)
416{
417 struct sock *sk = sock->sk;
418
419 if (sk) {
420 long timeout;
421
422 sock_rps_reset_flow(sk);
423
424 /* Applications forget to leave groups before exiting */
425 ip_mc_drop_socket(sk);
426
427 /* If linger is set, we don't return until the close
428 * is complete. Otherwise we return immediately. The
429 * actually closing is done the same either way.
430 *
431 * If the close is due to the process exiting, we never
432 * linger..
433 */
434 timeout = 0;
435 if (sock_flag(sk, SOCK_LINGER) &&
436 !(current->flags & PF_EXITING))
437 timeout = sk->sk_lingertime;
438 sock->sk = NULL;
439 sk->sk_prot->close(sk, timeout);
440 }
441 return 0;
442}
443EXPORT_SYMBOL(inet_release);
444
445/* It is off by default, see below. */
446int sysctl_ip_nonlocal_bind __read_mostly;
447EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
448
449int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
450{
451 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
452 struct sock *sk = sock->sk;
453 struct inet_sock *inet = inet_sk(sk);
454 unsigned short snum;
455 int chk_addr_ret;
456 int err;
457
458 /* If the socket has its own bind function then use it. (RAW) */
459 if (sk->sk_prot->bind) {
460 err = sk->sk_prot->bind(sk, uaddr, addr_len);
461 goto out;
462 }
463 err = -EINVAL;
464 if (addr_len < sizeof(struct sockaddr_in))
465 goto out;
466
467 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
468
469 /* Not specified by any standard per-se, however it breaks too
470 * many applications when removed. It is unfortunate since
471 * allowing applications to make a non-local bind solves
472 * several problems with systems using dynamic addressing.
473 * (ie. your servers still start up even if your ISDN link
474 * is temporarily down)
475 */
476 err = -EADDRNOTAVAIL;
477 if (!sysctl_ip_nonlocal_bind &&
478 !(inet->freebind || inet->transparent) &&
479 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
480 chk_addr_ret != RTN_LOCAL &&
481 chk_addr_ret != RTN_MULTICAST &&
482 chk_addr_ret != RTN_BROADCAST)
483 goto out;
484
485 snum = ntohs(addr->sin_port);
486 err = -EACCES;
487 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
488 goto out;
489
490 /* We keep a pair of addresses. rcv_saddr is the one
491 * used by hash lookups, and saddr is used for transmit.
492 *
493 * In the BSD API these are the same except where it
494 * would be illegal to use them (multicast/broadcast) in
495 * which case the sending device address is used.
496 */
497 lock_sock(sk);
498
499 /* Check these errors (active socket, double bind). */
500 err = -EINVAL;
501 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
502 goto out_release_sock;
503
504 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
505 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
506 inet->inet_saddr = 0; /* Use device */
507
508 /* Make sure we are allowed to bind here. */
509 if (sk->sk_prot->get_port(sk, snum)) {
510 inet->inet_saddr = inet->inet_rcv_saddr = 0;
511 err = -EADDRINUSE;
512 goto out_release_sock;
513 }
514
515 if (inet->inet_rcv_saddr)
516 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
517 if (snum)
518 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
519 inet->inet_sport = htons(inet->inet_num);
520 inet->inet_daddr = 0;
521 inet->inet_dport = 0;
522 sk_dst_reset(sk);
523 err = 0;
524out_release_sock:
525 release_sock(sk);
526out:
527 return err;
528}
529EXPORT_SYMBOL(inet_bind);
530
531int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
532 int addr_len, int flags)
533{
534 struct sock *sk = sock->sk;
535
536 if (addr_len < sizeof(uaddr->sa_family))
537 return -EINVAL;
538 if (uaddr->sa_family == AF_UNSPEC)
539 return sk->sk_prot->disconnect(sk, flags);
540
541 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
542 return -EAGAIN;
543 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
544}
545EXPORT_SYMBOL(inet_dgram_connect);
546
547static long inet_wait_for_connect(struct sock *sk, long timeo)
548{
549 DEFINE_WAIT(wait);
550
551 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
552
553 /* Basic assumption: if someone sets sk->sk_err, he _must_
554 * change state of the socket from TCP_SYN_*.
555 * Connect() does not allow to get error notifications
556 * without closing the socket.
557 */
558 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
559 release_sock(sk);
560 timeo = schedule_timeout(timeo);
561 lock_sock(sk);
562 if (signal_pending(current) || !timeo)
563 break;
564 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
565 }
566 finish_wait(sk_sleep(sk), &wait);
567 return timeo;
568}
569
570/*
571 * Connect to a remote host. There is regrettably still a little
572 * TCP 'magic' in here.
573 */
574int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
575 int addr_len, int flags)
576{
577 struct sock *sk = sock->sk;
578 int err;
579 long timeo;
580
581 if (addr_len < sizeof(uaddr->sa_family))
582 return -EINVAL;
583
584 lock_sock(sk);
585
586 if (uaddr->sa_family == AF_UNSPEC) {
587 err = sk->sk_prot->disconnect(sk, flags);
588 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
589 goto out;
590 }
591
592 switch (sock->state) {
593 default:
594 err = -EINVAL;
595 goto out;
596 case SS_CONNECTED:
597 err = -EISCONN;
598 goto out;
599 case SS_CONNECTING:
600 err = -EALREADY;
601 /* Fall out of switch with err, set for this state */
602 break;
603 case SS_UNCONNECTED:
604 err = -EISCONN;
605 if (sk->sk_state != TCP_CLOSE)
606 goto out;
607
608 err = sk->sk_prot->connect(sk, uaddr, addr_len);
609 if (err < 0)
610 goto out;
611
612 sock->state = SS_CONNECTING;
613
614 /* Just entered SS_CONNECTING state; the only
615 * difference is that return value in non-blocking
616 * case is EINPROGRESS, rather than EALREADY.
617 */
618 err = -EINPROGRESS;
619 break;
620 }
621
622 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
623
624 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
625 /* Error code is set above */
626 if (!timeo || !inet_wait_for_connect(sk, timeo))
627 goto out;
628
629 err = sock_intr_errno(timeo);
630 if (signal_pending(current))
631 goto out;
632 }
633
634 /* Connection was closed by RST, timeout, ICMP error
635 * or another process disconnected us.
636 */
637 if (sk->sk_state == TCP_CLOSE)
638 goto sock_error;
639
640 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
641 * and error was received after socket entered established state.
642 * Hence, it is handled normally after connect() return successfully.
643 */
644
645 sock->state = SS_CONNECTED;
646 err = 0;
647out:
648 release_sock(sk);
649 return err;
650
651sock_error:
652 err = sock_error(sk) ? : -ECONNABORTED;
653 sock->state = SS_UNCONNECTED;
654 if (sk->sk_prot->disconnect(sk, flags))
655 sock->state = SS_DISCONNECTING;
656 goto out;
657}
658EXPORT_SYMBOL(inet_stream_connect);
659
660/*
661 * Accept a pending connection. The TCP layer now gives BSD semantics.
662 */
663
664int inet_accept(struct socket *sock, struct socket *newsock, int flags)
665{
666 struct sock *sk1 = sock->sk;
667 int err = -EINVAL;
668 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
669
670 if (!sk2)
671 goto do_err;
672
673 lock_sock(sk2);
674
675 WARN_ON(!((1 << sk2->sk_state) &
676 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
677
678 sock_graft(sk2, newsock);
679
680 newsock->state = SS_CONNECTED;
681 err = 0;
682 release_sock(sk2);
683do_err:
684 return err;
685}
686EXPORT_SYMBOL(inet_accept);
687
688
689/*
690 * This does both peername and sockname.
691 */
692int inet_getname(struct socket *sock, struct sockaddr *uaddr,
693 int *uaddr_len, int peer)
694{
695 struct sock *sk = sock->sk;
696 struct inet_sock *inet = inet_sk(sk);
697 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
698
699 sin->sin_family = AF_INET;
700 if (peer) {
701 if (!inet->inet_dport ||
702 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
703 peer == 1))
704 return -ENOTCONN;
705 sin->sin_port = inet->inet_dport;
706 sin->sin_addr.s_addr = inet->inet_daddr;
707 } else {
708 __be32 addr = inet->inet_rcv_saddr;
709 if (!addr)
710 addr = inet->inet_saddr;
711 sin->sin_port = inet->inet_sport;
712 sin->sin_addr.s_addr = addr;
713 }
714 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
715 *uaddr_len = sizeof(*sin);
716 return 0;
717}
718EXPORT_SYMBOL(inet_getname);
719
720int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
721 size_t size)
722{
723 struct sock *sk = sock->sk;
724
725 sock_rps_record_flow(sk);
726
727 /* We may need to bind the socket. */
728 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
729 inet_autobind(sk))
730 return -EAGAIN;
731
732 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
733}
734EXPORT_SYMBOL(inet_sendmsg);
735
736ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
737 size_t size, int flags)
738{
739 struct sock *sk = sock->sk;
740
741 sock_rps_record_flow(sk);
742
743 /* We may need to bind the socket. */
744 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
745 inet_autobind(sk))
746 return -EAGAIN;
747
748 if (sk->sk_prot->sendpage)
749 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
750 return sock_no_sendpage(sock, page, offset, size, flags);
751}
752EXPORT_SYMBOL(inet_sendpage);
753
754int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
755 size_t size, int flags)
756{
757 struct sock *sk = sock->sk;
758 int addr_len = 0;
759 int err;
760
761 sock_rps_record_flow(sk);
762
763 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
764 flags & ~MSG_DONTWAIT, &addr_len);
765 if (err >= 0)
766 msg->msg_namelen = addr_len;
767 return err;
768}
769EXPORT_SYMBOL(inet_recvmsg);
770
771int inet_shutdown(struct socket *sock, int how)
772{
773 struct sock *sk = sock->sk;
774 int err = 0;
775
776 /* This should really check to make sure
777 * the socket is a TCP socket. (WHY AC...)
778 */
779 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
780 1->2 bit 2 snds.
781 2->3 */
782 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
783 return -EINVAL;
784
785 lock_sock(sk);
786 if (sock->state == SS_CONNECTING) {
787 if ((1 << sk->sk_state) &
788 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
789 sock->state = SS_DISCONNECTING;
790 else
791 sock->state = SS_CONNECTED;
792 }
793
794 switch (sk->sk_state) {
795 case TCP_CLOSE:
796 err = -ENOTCONN;
797 /* Hack to wake up other listeners, who can poll for
798 POLLHUP, even on eg. unconnected UDP sockets -- RR */
799 default:
800 sk->sk_shutdown |= how;
801 if (sk->sk_prot->shutdown)
802 sk->sk_prot->shutdown(sk, how);
803 break;
804
805 /* Remaining two branches are temporary solution for missing
806 * close() in multithreaded environment. It is _not_ a good idea,
807 * but we have no choice until close() is repaired at VFS level.
808 */
809 case TCP_LISTEN:
810 if (!(how & RCV_SHUTDOWN))
811 break;
812 /* Fall through */
813 case TCP_SYN_SENT:
814 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
815 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
816 break;
817 }
818
819 /* Wake up anyone sleeping in poll. */
820 sk->sk_state_change(sk);
821 release_sock(sk);
822 return err;
823}
824EXPORT_SYMBOL(inet_shutdown);
825
826/*
827 * ioctl() calls you can issue on an INET socket. Most of these are
828 * device configuration and stuff and very rarely used. Some ioctls
829 * pass on to the socket itself.
830 *
831 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
832 * loads the devconfigure module does its configuring and unloads it.
833 * There's a good 20K of config code hanging around the kernel.
834 */
835
836int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
837{
838 struct sock *sk = sock->sk;
839 int err = 0;
840 struct net *net = sock_net(sk);
841
842 switch (cmd) {
843 case SIOCGSTAMP:
844 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
845 break;
846 case SIOCGSTAMPNS:
847 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
848 break;
849 case SIOCADDRT:
850 case SIOCDELRT:
851 case SIOCRTMSG:
852 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
853 break;
854 case SIOCDARP:
855 case SIOCGARP:
856 case SIOCSARP:
857 err = arp_ioctl(net, cmd, (void __user *)arg);
858 break;
859 case SIOCGIFADDR:
860 case SIOCSIFADDR:
861 case SIOCGIFBRDADDR:
862 case SIOCSIFBRDADDR:
863 case SIOCGIFNETMASK:
864 case SIOCSIFNETMASK:
865 case SIOCGIFDSTADDR:
866 case SIOCSIFDSTADDR:
867 case SIOCSIFPFLAGS:
868 case SIOCGIFPFLAGS:
869 case SIOCSIFFLAGS:
870 err = devinet_ioctl(net, cmd, (void __user *)arg);
871 break;
872 default:
873 if (sk->sk_prot->ioctl)
874 err = sk->sk_prot->ioctl(sk, cmd, arg);
875 else
876 err = -ENOIOCTLCMD;
877 break;
878 }
879 return err;
880}
881EXPORT_SYMBOL(inet_ioctl);
882
883const struct proto_ops inet_stream_ops = {
884 .family = PF_INET,
885 .owner = THIS_MODULE,
886 .release = inet_release,
887 .bind = inet_bind,
888 .connect = inet_stream_connect,
889 .socketpair = sock_no_socketpair,
890 .accept = inet_accept,
891 .getname = inet_getname,
892 .poll = tcp_poll,
893 .ioctl = inet_ioctl,
894 .listen = inet_listen,
895 .shutdown = inet_shutdown,
896 .setsockopt = sock_common_setsockopt,
897 .getsockopt = sock_common_getsockopt,
898 .sendmsg = inet_sendmsg,
899 .recvmsg = inet_recvmsg,
900 .mmap = sock_no_mmap,
901 .sendpage = inet_sendpage,
902 .splice_read = tcp_splice_read,
903#ifdef CONFIG_COMPAT
904 .compat_setsockopt = compat_sock_common_setsockopt,
905 .compat_getsockopt = compat_sock_common_getsockopt,
906#endif
907};
908EXPORT_SYMBOL(inet_stream_ops);
909
910const struct proto_ops inet_dgram_ops = {
911 .family = PF_INET,
912 .owner = THIS_MODULE,
913 .release = inet_release,
914 .bind = inet_bind,
915 .connect = inet_dgram_connect,
916 .socketpair = sock_no_socketpair,
917 .accept = sock_no_accept,
918 .getname = inet_getname,
919 .poll = udp_poll,
920 .ioctl = inet_ioctl,
921 .listen = sock_no_listen,
922 .shutdown = inet_shutdown,
923 .setsockopt = sock_common_setsockopt,
924 .getsockopt = sock_common_getsockopt,
925 .sendmsg = inet_sendmsg,
926 .recvmsg = inet_recvmsg,
927 .mmap = sock_no_mmap,
928 .sendpage = inet_sendpage,
929#ifdef CONFIG_COMPAT
930 .compat_setsockopt = compat_sock_common_setsockopt,
931 .compat_getsockopt = compat_sock_common_getsockopt,
932#endif
933};
934EXPORT_SYMBOL(inet_dgram_ops);
935
936/*
937 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
938 * udp_poll
939 */
940static const struct proto_ops inet_sockraw_ops = {
941 .family = PF_INET,
942 .owner = THIS_MODULE,
943 .release = inet_release,
944 .bind = inet_bind,
945 .connect = inet_dgram_connect,
946 .socketpair = sock_no_socketpair,
947 .accept = sock_no_accept,
948 .getname = inet_getname,
949 .poll = datagram_poll,
950 .ioctl = inet_ioctl,
951 .listen = sock_no_listen,
952 .shutdown = inet_shutdown,
953 .setsockopt = sock_common_setsockopt,
954 .getsockopt = sock_common_getsockopt,
955 .sendmsg = inet_sendmsg,
956 .recvmsg = inet_recvmsg,
957 .mmap = sock_no_mmap,
958 .sendpage = inet_sendpage,
959#ifdef CONFIG_COMPAT
960 .compat_setsockopt = compat_sock_common_setsockopt,
961 .compat_getsockopt = compat_sock_common_getsockopt,
962#endif
963};
964
965static const struct net_proto_family inet_family_ops = {
966 .family = PF_INET,
967 .create = inet_create,
968 .owner = THIS_MODULE,
969};
970
971/* Upon startup we insert all the elements in inetsw_array[] into
972 * the linked list inetsw.
973 */
974static struct inet_protosw inetsw_array[] =
975{
976 {
977 .type = SOCK_STREAM,
978 .protocol = IPPROTO_TCP,
979 .prot = &tcp_prot,
980 .ops = &inet_stream_ops,
981 .no_check = 0,
982 .flags = INET_PROTOSW_PERMANENT |
983 INET_PROTOSW_ICSK,
984 },
985
986 {
987 .type = SOCK_DGRAM,
988 .protocol = IPPROTO_UDP,
989 .prot = &udp_prot,
990 .ops = &inet_dgram_ops,
991 .no_check = UDP_CSUM_DEFAULT,
992 .flags = INET_PROTOSW_PERMANENT,
993 },
994
995
996 {
997 .type = SOCK_RAW,
998 .protocol = IPPROTO_IP, /* wild card */
999 .prot = &raw_prot,
1000 .ops = &inet_sockraw_ops,
1001 .no_check = UDP_CSUM_DEFAULT,
1002 .flags = INET_PROTOSW_REUSE,
1003 }
1004};
1005
1006#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1007
1008void inet_register_protosw(struct inet_protosw *p)
1009{
1010 struct list_head *lh;
1011 struct inet_protosw *answer;
1012 int protocol = p->protocol;
1013 struct list_head *last_perm;
1014
1015 spin_lock_bh(&inetsw_lock);
1016
1017 if (p->type >= SOCK_MAX)
1018 goto out_illegal;
1019
1020 /* If we are trying to override a permanent protocol, bail. */
1021 answer = NULL;
1022 last_perm = &inetsw[p->type];
1023 list_for_each(lh, &inetsw[p->type]) {
1024 answer = list_entry(lh, struct inet_protosw, list);
1025
1026 /* Check only the non-wild match. */
1027 if (INET_PROTOSW_PERMANENT & answer->flags) {
1028 if (protocol == answer->protocol)
1029 break;
1030 last_perm = lh;
1031 }
1032
1033 answer = NULL;
1034 }
1035 if (answer)
1036 goto out_permanent;
1037
1038 /* Add the new entry after the last permanent entry if any, so that
1039 * the new entry does not override a permanent entry when matched with
1040 * a wild-card protocol. But it is allowed to override any existing
1041 * non-permanent entry. This means that when we remove this entry, the
1042 * system automatically returns to the old behavior.
1043 */
1044 list_add_rcu(&p->list, last_perm);
1045out:
1046 spin_unlock_bh(&inetsw_lock);
1047
1048 return;
1049
1050out_permanent:
1051 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
1052 protocol);
1053 goto out;
1054
1055out_illegal:
1056 printk(KERN_ERR
1057 "Ignoring attempt to register invalid socket type %d.\n",
1058 p->type);
1059 goto out;
1060}
1061EXPORT_SYMBOL(inet_register_protosw);
1062
1063void inet_unregister_protosw(struct inet_protosw *p)
1064{
1065 if (INET_PROTOSW_PERMANENT & p->flags) {
1066 printk(KERN_ERR
1067 "Attempt to unregister permanent protocol %d.\n",
1068 p->protocol);
1069 } else {
1070 spin_lock_bh(&inetsw_lock);
1071 list_del_rcu(&p->list);
1072 spin_unlock_bh(&inetsw_lock);
1073
1074 synchronize_net();
1075 }
1076}
1077EXPORT_SYMBOL(inet_unregister_protosw);
1078
1079/*
1080 * Shall we try to damage output packets if routing dev changes?
1081 */
1082
1083int sysctl_ip_dynaddr __read_mostly;
1084
1085static int inet_sk_reselect_saddr(struct sock *sk)
1086{
1087 struct inet_sock *inet = inet_sk(sk);
1088 int err;
1089 struct rtable *rt;
1090 __be32 old_saddr = inet->inet_saddr;
1091 __be32 new_saddr;
1092 __be32 daddr = inet->inet_daddr;
1093
1094 if (inet->opt && inet->opt->srr)
1095 daddr = inet->opt->faddr;
1096
1097 /* Query new route. */
1098 err = ip_route_connect(&rt, daddr, 0,
1099 RT_CONN_FLAGS(sk),
1100 sk->sk_bound_dev_if,
1101 sk->sk_protocol,
1102 inet->inet_sport, inet->inet_dport, sk, 0);
1103 if (err)
1104 return err;
1105
1106 sk_setup_caps(sk, &rt->dst);
1107
1108 new_saddr = rt->rt_src;
1109
1110 if (new_saddr == old_saddr)
1111 return 0;
1112
1113 if (sysctl_ip_dynaddr > 1) {
1114 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n",
1115 __func__, &old_saddr, &new_saddr);
1116 }
1117
1118 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1119
1120 /*
1121 * XXX The only one ugly spot where we need to
1122 * XXX really change the sockets identity after
1123 * XXX it has entered the hashes. -DaveM
1124 *
1125 * Besides that, it does not check for connection
1126 * uniqueness. Wait for troubles.
1127 */
1128 __sk_prot_rehash(sk);
1129 return 0;
1130}
1131
1132int inet_sk_rebuild_header(struct sock *sk)
1133{
1134 struct inet_sock *inet = inet_sk(sk);
1135 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1136 __be32 daddr;
1137 int err;
1138
1139 /* Route is OK, nothing to do. */
1140 if (rt)
1141 return 0;
1142
1143 /* Reroute. */
1144 daddr = inet->inet_daddr;
1145 if (inet->opt && inet->opt->srr)
1146 daddr = inet->opt->faddr;
1147{
1148 struct flowi fl = {
1149 .oif = sk->sk_bound_dev_if,
1150 .mark = sk->sk_mark,
1151 .fl4_dst = daddr,
1152 .fl4_src = inet->inet_saddr,
1153 .fl4_tos = RT_CONN_FLAGS(sk),
1154 .proto = sk->sk_protocol,
1155 .flags = inet_sk_flowi_flags(sk),
1156 .fl_ip_sport = inet->inet_sport,
1157 .fl_ip_dport = inet->inet_dport,
1158 };
1159
1160 security_sk_classify_flow(sk, &fl);
1161 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
1162}
1163 if (!err)
1164 sk_setup_caps(sk, &rt->dst);
1165 else {
1166 /* Routing failed... */
1167 sk->sk_route_caps = 0;
1168 /*
1169 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1170 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1171 */
1172 if (!sysctl_ip_dynaddr ||
1173 sk->sk_state != TCP_SYN_SENT ||
1174 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1175 (err = inet_sk_reselect_saddr(sk)) != 0)
1176 sk->sk_err_soft = -err;
1177 }
1178
1179 return err;
1180}
1181EXPORT_SYMBOL(inet_sk_rebuild_header);
1182
1183static int inet_gso_send_check(struct sk_buff *skb)
1184{
1185 struct iphdr *iph;
1186 const struct net_protocol *ops;
1187 int proto;
1188 int ihl;
1189 int err = -EINVAL;
1190
1191 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1192 goto out;
1193
1194 iph = ip_hdr(skb);
1195 ihl = iph->ihl * 4;
1196 if (ihl < sizeof(*iph))
1197 goto out;
1198
1199 if (unlikely(!pskb_may_pull(skb, ihl)))
1200 goto out;
1201
1202 __skb_pull(skb, ihl);
1203 skb_reset_transport_header(skb);
1204 iph = ip_hdr(skb);
1205 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1206 err = -EPROTONOSUPPORT;
1207
1208 rcu_read_lock();
1209 ops = rcu_dereference(inet_protos[proto]);
1210 if (likely(ops && ops->gso_send_check))
1211 err = ops->gso_send_check(skb);
1212 rcu_read_unlock();
1213
1214out:
1215 return err;
1216}
1217
1218static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
1219{
1220 struct sk_buff *segs = ERR_PTR(-EINVAL);
1221 struct iphdr *iph;
1222 const struct net_protocol *ops;
1223 int proto;
1224 int ihl;
1225 int id;
1226 unsigned int offset = 0;
1227
1228 if (!(features & NETIF_F_V4_CSUM))
1229 features &= ~NETIF_F_SG;
1230
1231 if (unlikely(skb_shinfo(skb)->gso_type &
1232 ~(SKB_GSO_TCPV4 |
1233 SKB_GSO_UDP |
1234 SKB_GSO_DODGY |
1235 SKB_GSO_TCP_ECN |
1236 0)))
1237 goto out;
1238
1239 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1240 goto out;
1241
1242 iph = ip_hdr(skb);
1243 ihl = iph->ihl * 4;
1244 if (ihl < sizeof(*iph))
1245 goto out;
1246
1247 if (unlikely(!pskb_may_pull(skb, ihl)))
1248 goto out;
1249
1250 __skb_pull(skb, ihl);
1251 skb_reset_transport_header(skb);
1252 iph = ip_hdr(skb);
1253 id = ntohs(iph->id);
1254 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1255 segs = ERR_PTR(-EPROTONOSUPPORT);
1256
1257 rcu_read_lock();
1258 ops = rcu_dereference(inet_protos[proto]);
1259 if (likely(ops && ops->gso_segment))
1260 segs = ops->gso_segment(skb, features);
1261 rcu_read_unlock();
1262
1263 if (!segs || IS_ERR(segs))
1264 goto out;
1265
1266 skb = segs;
1267 do {
1268 iph = ip_hdr(skb);
1269 if (proto == IPPROTO_UDP) {
1270 iph->id = htons(id);
1271 iph->frag_off = htons(offset >> 3);
1272 if (skb->next != NULL)
1273 iph->frag_off |= htons(IP_MF);
1274 offset += (skb->len - skb->mac_len - iph->ihl * 4);
1275 } else
1276 iph->id = htons(id++);
1277 iph->tot_len = htons(skb->len - skb->mac_len);
1278 iph->check = 0;
1279 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
1280 } while ((skb = skb->next));
1281
1282out:
1283 return segs;
1284}
1285
1286static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1287 struct sk_buff *skb)
1288{
1289 const struct net_protocol *ops;
1290 struct sk_buff **pp = NULL;
1291 struct sk_buff *p;
1292 struct iphdr *iph;
1293 unsigned int hlen;
1294 unsigned int off;
1295 unsigned int id;
1296 int flush = 1;
1297 int proto;
1298
1299 off = skb_gro_offset(skb);
1300 hlen = off + sizeof(*iph);
1301 iph = skb_gro_header_fast(skb, off);
1302 if (skb_gro_header_hard(skb, hlen)) {
1303 iph = skb_gro_header_slow(skb, hlen, off);
1304 if (unlikely(!iph))
1305 goto out;
1306 }
1307
1308 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1309
1310 rcu_read_lock();
1311 ops = rcu_dereference(inet_protos[proto]);
1312 if (!ops || !ops->gro_receive)
1313 goto out_unlock;
1314
1315 if (*(u8 *)iph != 0x45)
1316 goto out_unlock;
1317
1318 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1319 goto out_unlock;
1320
1321 id = ntohl(*(__be32 *)&iph->id);
1322 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
1323 id >>= 16;
1324
1325 for (p = *head; p; p = p->next) {
1326 struct iphdr *iph2;
1327
1328 if (!NAPI_GRO_CB(p)->same_flow)
1329 continue;
1330
1331 iph2 = ip_hdr(p);
1332
1333 if ((iph->protocol ^ iph2->protocol) |
1334 (iph->tos ^ iph2->tos) |
1335 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1336 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1337 NAPI_GRO_CB(p)->same_flow = 0;
1338 continue;
1339 }
1340
1341 /* All fields must match except length and checksum. */
1342 NAPI_GRO_CB(p)->flush |=
1343 (iph->ttl ^ iph2->ttl) |
1344 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1345
1346 NAPI_GRO_CB(p)->flush |= flush;
1347 }
1348
1349 NAPI_GRO_CB(skb)->flush |= flush;
1350 skb_gro_pull(skb, sizeof(*iph));
1351 skb_set_transport_header(skb, skb_gro_offset(skb));
1352
1353 pp = ops->gro_receive(head, skb);
1354
1355out_unlock:
1356 rcu_read_unlock();
1357
1358out:
1359 NAPI_GRO_CB(skb)->flush |= flush;
1360
1361 return pp;
1362}
1363
1364static int inet_gro_complete(struct sk_buff *skb)
1365{
1366 const struct net_protocol *ops;
1367 struct iphdr *iph = ip_hdr(skb);
1368 int proto = iph->protocol & (MAX_INET_PROTOS - 1);
1369 int err = -ENOSYS;
1370 __be16 newlen = htons(skb->len - skb_network_offset(skb));
1371
1372 csum_replace2(&iph->check, iph->tot_len, newlen);
1373 iph->tot_len = newlen;
1374
1375 rcu_read_lock();
1376 ops = rcu_dereference(inet_protos[proto]);
1377 if (WARN_ON(!ops || !ops->gro_complete))
1378 goto out_unlock;
1379
1380 err = ops->gro_complete(skb);
1381
1382out_unlock:
1383 rcu_read_unlock();
1384
1385 return err;
1386}
1387
1388int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1389 unsigned short type, unsigned char protocol,
1390 struct net *net)
1391{
1392 struct socket *sock;
1393 int rc = sock_create_kern(family, type, protocol, &sock);
1394
1395 if (rc == 0) {
1396 *sk = sock->sk;
1397 (*sk)->sk_allocation = GFP_ATOMIC;
1398 /*
1399 * Unhash it so that IP input processing does not even see it,
1400 * we do not wish this socket to see incoming packets.
1401 */
1402 (*sk)->sk_prot->unhash(*sk);
1403
1404 sk_change_net(*sk, net);
1405 }
1406 return rc;
1407}
1408EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1409
1410unsigned long snmp_fold_field(void __percpu *mib[], int offt)
1411{
1412 unsigned long res = 0;
1413 int i;
1414
1415 for_each_possible_cpu(i) {
1416 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
1417 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
1418 }
1419 return res;
1420}
1421EXPORT_SYMBOL_GPL(snmp_fold_field);
1422
1423#if BITS_PER_LONG==32
1424
1425u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset)
1426{
1427 u64 res = 0;
1428 int cpu;
1429
1430 for_each_possible_cpu(cpu) {
1431 void *bhptr, *userptr;
1432 struct u64_stats_sync *syncp;
1433 u64 v_bh, v_user;
1434 unsigned int start;
1435
1436 /* first mib used by softirq context, we must use _bh() accessors */
1437 bhptr = per_cpu_ptr(SNMP_STAT_BHPTR(mib), cpu);
1438 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1439 do {
1440 start = u64_stats_fetch_begin_bh(syncp);
1441 v_bh = *(((u64 *) bhptr) + offt);
1442 } while (u64_stats_fetch_retry_bh(syncp, start));
1443
1444 /* second mib used in USER context */
1445 userptr = per_cpu_ptr(SNMP_STAT_USRPTR(mib), cpu);
1446 syncp = (struct u64_stats_sync *)(userptr + syncp_offset);
1447 do {
1448 start = u64_stats_fetch_begin(syncp);
1449 v_user = *(((u64 *) userptr) + offt);
1450 } while (u64_stats_fetch_retry(syncp, start));
1451
1452 res += v_bh + v_user;
1453 }
1454 return res;
1455}
1456EXPORT_SYMBOL_GPL(snmp_fold_field64);
1457#endif
1458
1459int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align)
1460{
1461 BUG_ON(ptr == NULL);
1462 ptr[0] = __alloc_percpu(mibsize, align);
1463 if (!ptr[0])
1464 goto err0;
1465 ptr[1] = __alloc_percpu(mibsize, align);
1466 if (!ptr[1])
1467 goto err1;
1468 return 0;
1469err1:
1470 free_percpu(ptr[0]);
1471 ptr[0] = NULL;
1472err0:
1473 return -ENOMEM;
1474}
1475EXPORT_SYMBOL_GPL(snmp_mib_init);
1476
1477void snmp_mib_free(void __percpu *ptr[2])
1478{
1479 BUG_ON(ptr == NULL);
1480 free_percpu(ptr[0]);
1481 free_percpu(ptr[1]);
1482 ptr[0] = ptr[1] = NULL;
1483}
1484EXPORT_SYMBOL_GPL(snmp_mib_free);
1485
1486#ifdef CONFIG_IP_MULTICAST
1487static const struct net_protocol igmp_protocol = {
1488 .handler = igmp_rcv,
1489 .netns_ok = 1,
1490};
1491#endif
1492
1493static const struct net_protocol tcp_protocol = {
1494 .handler = tcp_v4_rcv,
1495 .err_handler = tcp_v4_err,
1496 .gso_send_check = tcp_v4_gso_send_check,
1497 .gso_segment = tcp_tso_segment,
1498 .gro_receive = tcp4_gro_receive,
1499 .gro_complete = tcp4_gro_complete,
1500 .no_policy = 1,
1501 .netns_ok = 1,
1502};
1503
1504static const struct net_protocol udp_protocol = {
1505 .handler = udp_rcv,
1506 .err_handler = udp_err,
1507 .gso_send_check = udp4_ufo_send_check,
1508 .gso_segment = udp4_ufo_fragment,
1509 .no_policy = 1,
1510 .netns_ok = 1,
1511};
1512
1513static const struct net_protocol icmp_protocol = {
1514 .handler = icmp_rcv,
1515 .no_policy = 1,
1516 .netns_ok = 1,
1517};
1518
1519static __net_init int ipv4_mib_init_net(struct net *net)
1520{
1521 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics,
1522 sizeof(struct tcp_mib),
1523 __alignof__(struct tcp_mib)) < 0)
1524 goto err_tcp_mib;
1525 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics,
1526 sizeof(struct ipstats_mib),
1527 __alignof__(struct ipstats_mib)) < 0)
1528 goto err_ip_mib;
1529 if (snmp_mib_init((void __percpu **)net->mib.net_statistics,
1530 sizeof(struct linux_mib),
1531 __alignof__(struct linux_mib)) < 0)
1532 goto err_net_mib;
1533 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics,
1534 sizeof(struct udp_mib),
1535 __alignof__(struct udp_mib)) < 0)
1536 goto err_udp_mib;
1537 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics,
1538 sizeof(struct udp_mib),
1539 __alignof__(struct udp_mib)) < 0)
1540 goto err_udplite_mib;
1541 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics,
1542 sizeof(struct icmp_mib),
1543 __alignof__(struct icmp_mib)) < 0)
1544 goto err_icmp_mib;
1545 if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics,
1546 sizeof(struct icmpmsg_mib),
1547 __alignof__(struct icmpmsg_mib)) < 0)
1548 goto err_icmpmsg_mib;
1549
1550 tcp_mib_init(net);
1551 return 0;
1552
1553err_icmpmsg_mib:
1554 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1555err_icmp_mib:
1556 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1557err_udplite_mib:
1558 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1559err_udp_mib:
1560 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1561err_net_mib:
1562 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1563err_ip_mib:
1564 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
1565err_tcp_mib:
1566 return -ENOMEM;
1567}
1568
1569static __net_exit void ipv4_mib_exit_net(struct net *net)
1570{
1571 snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics);
1572 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1573 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1574 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1575 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1576 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1577 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
1578}
1579
1580static __net_initdata struct pernet_operations ipv4_mib_ops = {
1581 .init = ipv4_mib_init_net,
1582 .exit = ipv4_mib_exit_net,
1583};
1584
1585static int __init init_ipv4_mibs(void)
1586{
1587 return register_pernet_subsys(&ipv4_mib_ops);
1588}
1589
1590static int ipv4_proc_init(void);
1591
1592/*
1593 * IP protocol layer initialiser
1594 */
1595
1596static struct packet_type ip_packet_type __read_mostly = {
1597 .type = cpu_to_be16(ETH_P_IP),
1598 .func = ip_rcv,
1599 .gso_send_check = inet_gso_send_check,
1600 .gso_segment = inet_gso_segment,
1601 .gro_receive = inet_gro_receive,
1602 .gro_complete = inet_gro_complete,
1603};
1604
1605static int __init inet_init(void)
1606{
1607 struct sk_buff *dummy_skb;
1608 struct inet_protosw *q;
1609 struct list_head *r;
1610 int rc = -EINVAL;
1611
1612 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
1613
1614 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1615 if (!sysctl_local_reserved_ports)
1616 goto out;
1617
1618 rc = proto_register(&tcp_prot, 1);
1619 if (rc)
1620 goto out_free_reserved_ports;
1621
1622 rc = proto_register(&udp_prot, 1);
1623 if (rc)
1624 goto out_unregister_tcp_proto;
1625
1626 rc = proto_register(&raw_prot, 1);
1627 if (rc)
1628 goto out_unregister_udp_proto;
1629
1630 /*
1631 * Tell SOCKET that we are alive...
1632 */
1633
1634 (void)sock_register(&inet_family_ops);
1635
1636#ifdef CONFIG_SYSCTL
1637 ip_static_sysctl_init();
1638#endif
1639
1640 /*
1641 * Add all the base protocols.
1642 */
1643
1644 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1645 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1646 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1647 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1648 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1649 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1650#ifdef CONFIG_IP_MULTICAST
1651 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1652 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1653#endif
1654
1655 /* Register the socket-side information for inet_create. */
1656 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1657 INIT_LIST_HEAD(r);
1658
1659 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1660 inet_register_protosw(q);
1661
1662 /*
1663 * Set the ARP module up
1664 */
1665
1666 arp_init();
1667
1668 /*
1669 * Set the IP module up
1670 */
1671
1672 ip_init();
1673
1674 tcp_v4_init();
1675
1676 /* Setup TCP slab cache for open requests. */
1677 tcp_init();
1678
1679 /* Setup UDP memory threshold */
1680 udp_init();
1681
1682 /* Add UDP-Lite (RFC 3828) */
1683 udplite4_register();
1684
1685 /*
1686 * Set the ICMP layer up
1687 */
1688
1689 if (icmp_init() < 0)
1690 panic("Failed to create the ICMP control socket.\n");
1691
1692 /*
1693 * Initialise the multicast router
1694 */
1695#if defined(CONFIG_IP_MROUTE)
1696 if (ip_mr_init())
1697 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n");
1698#endif
1699 /*
1700 * Initialise per-cpu ipv4 mibs
1701 */
1702
1703 if (init_ipv4_mibs())
1704 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n");
1705
1706 ipv4_proc_init();
1707
1708 ipfrag_init();
1709
1710 dev_add_pack(&ip_packet_type);
1711
1712 rc = 0;
1713out:
1714 return rc;
1715out_unregister_udp_proto:
1716 proto_unregister(&udp_prot);
1717out_unregister_tcp_proto:
1718 proto_unregister(&tcp_prot);
1719out_free_reserved_ports:
1720 kfree(sysctl_local_reserved_ports);
1721 goto out;
1722}
1723
1724fs_initcall(inet_init);
1725
1726/* ------------------------------------------------------------------------ */
1727
1728#ifdef CONFIG_PROC_FS
1729static int __init ipv4_proc_init(void)
1730{
1731 int rc = 0;
1732
1733 if (raw_proc_init())
1734 goto out_raw;
1735 if (tcp4_proc_init())
1736 goto out_tcp;
1737 if (udp4_proc_init())
1738 goto out_udp;
1739 if (ip_misc_proc_init())
1740 goto out_misc;
1741out:
1742 return rc;
1743out_misc:
1744 udp4_proc_exit();
1745out_udp:
1746 tcp4_proc_exit();
1747out_tcp:
1748 raw_proc_exit();
1749out_raw:
1750 rc = -ENOMEM;
1751 goto out;
1752}
1753
1754#else /* CONFIG_PROC_FS */
1755static int __init ipv4_proc_init(void)
1756{
1757 return 0;
1758}
1759#endif /* CONFIG_PROC_FS */
1760
1761MODULE_ALIAS_NETPROTO(PF_INET);
1762
Clone of davem's net-next-2.6 tree