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[deliverable/linux.git] / net / ipv4 / af_inet.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * PF_INET protocol family socket handler.
7 *
8 * 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 #define pr_fmt(fmt) "IPv4: " fmt
69
70 #include <linux/err.h>
71 #include <linux/errno.h>
72 #include <linux/types.h>
73 #include <linux/socket.h>
74 #include <linux/in.h>
75 #include <linux/kernel.h>
76 #include <linux/module.h>
77 #include <linux/sched.h>
78 #include <linux/timer.h>
79 #include <linux/string.h>
80 #include <linux/sockios.h>
81 #include <linux/net.h>
82 #include <linux/capability.h>
83 #include <linux/fcntl.h>
84 #include <linux/mm.h>
85 #include <linux/interrupt.h>
86 #include <linux/stat.h>
87 #include <linux/init.h>
88 #include <linux/poll.h>
89 #include <linux/netfilter_ipv4.h>
90 #include <linux/random.h>
91 #include <linux/slab.h>
92
93 #include <asm/uaccess.h>
94
95 #include <linux/inet.h>
96 #include <linux/igmp.h>
97 #include <linux/inetdevice.h>
98 #include <linux/netdevice.h>
99 #include <net/checksum.h>
100 #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>
105 #include <net/inet_connection_sock.h>
106 #include <net/tcp.h>
107 #include <net/udp.h>
108 #include <net/udplite.h>
109 #include <net/ping.h>
110 #include <linux/skbuff.h>
111 #include <net/sock.h>
112 #include <net/raw.h>
113 #include <net/icmp.h>
114 #include <net/inet_common.h>
115 #include <net/xfrm.h>
116 #include <net/net_namespace.h>
117 #include <net/secure_seq.h>
118 #ifdef CONFIG_IP_MROUTE
119 #include <linux/mroute.h>
120 #endif
121
122
123 /* The inetsw table contains everything that inet_create needs to
124 * build a new socket.
125 */
126 static struct list_head inetsw[SOCK_MAX];
127 static DEFINE_SPINLOCK(inetsw_lock);
128
129 /* New destruction routine */
130
131 void inet_sock_destruct(struct sock *sk)
132 {
133 struct inet_sock *inet = inet_sk(sk);
134
135 __skb_queue_purge(&sk->sk_receive_queue);
136 __skb_queue_purge(&sk->sk_error_queue);
137
138 sk_mem_reclaim(sk);
139
140 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
141 pr_err("Attempt to release TCP socket in state %d %p\n",
142 sk->sk_state, sk);
143 return;
144 }
145 if (!sock_flag(sk, SOCK_DEAD)) {
146 pr_err("Attempt to release alive inet socket %p\n", sk);
147 return;
148 }
149
150 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
151 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
152 WARN_ON(sk->sk_wmem_queued);
153 WARN_ON(sk->sk_forward_alloc);
154
155 kfree(rcu_dereference_protected(inet->inet_opt, 1));
156 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
157 dst_release(sk->sk_rx_dst);
158 sk_refcnt_debug_dec(sk);
159 }
160 EXPORT_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
172 static 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 */
192 int 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 /* Check special setups for testing purpose to enable TFO w/o
213 * requiring TCP_FASTOPEN sockopt.
214 * Note that only TCP sockets (SOCK_STREAM) will reach here.
215 * Also fastopenq may already been allocated because this
216 * socket was in TCP_LISTEN state previously but was
217 * shutdown() (rather than close()).
218 */
219 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 &&
220 inet_csk(sk)->icsk_accept_queue.fastopenq == NULL) {
221 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0)
222 err = fastopen_init_queue(sk, backlog);
223 else if ((sysctl_tcp_fastopen &
224 TFO_SERVER_WO_SOCKOPT2) != 0)
225 err = fastopen_init_queue(sk,
226 ((uint)sysctl_tcp_fastopen) >> 16);
227 else
228 err = 0;
229 if (err)
230 goto out;
231 }
232 err = inet_csk_listen_start(sk, backlog);
233 if (err)
234 goto out;
235 }
236 sk->sk_max_ack_backlog = backlog;
237 err = 0;
238
239 out:
240 release_sock(sk);
241 return err;
242 }
243 EXPORT_SYMBOL(inet_listen);
244
245 /*
246 * Create an inet socket.
247 */
248
249 static int inet_create(struct net *net, struct socket *sock, int protocol,
250 int kern)
251 {
252 struct sock *sk;
253 struct inet_protosw *answer;
254 struct inet_sock *inet;
255 struct proto *answer_prot;
256 unsigned char answer_flags;
257 int try_loading_module = 0;
258 int err;
259
260 sock->state = SS_UNCONNECTED;
261
262 /* Look for the requested type/protocol pair. */
263 lookup_protocol:
264 err = -ESOCKTNOSUPPORT;
265 rcu_read_lock();
266 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
267
268 err = 0;
269 /* Check the non-wild match. */
270 if (protocol == answer->protocol) {
271 if (protocol != IPPROTO_IP)
272 break;
273 } else {
274 /* Check for the two wild cases. */
275 if (IPPROTO_IP == protocol) {
276 protocol = answer->protocol;
277 break;
278 }
279 if (IPPROTO_IP == answer->protocol)
280 break;
281 }
282 err = -EPROTONOSUPPORT;
283 }
284
285 if (unlikely(err)) {
286 if (try_loading_module < 2) {
287 rcu_read_unlock();
288 /*
289 * Be more specific, e.g. net-pf-2-proto-132-type-1
290 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
291 */
292 if (++try_loading_module == 1)
293 request_module("net-pf-%d-proto-%d-type-%d",
294 PF_INET, protocol, sock->type);
295 /*
296 * Fall back to generic, e.g. net-pf-2-proto-132
297 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
298 */
299 else
300 request_module("net-pf-%d-proto-%d",
301 PF_INET, protocol);
302 goto lookup_protocol;
303 } else
304 goto out_rcu_unlock;
305 }
306
307 err = -EPERM;
308 if (sock->type == SOCK_RAW && !kern &&
309 !ns_capable(net->user_ns, CAP_NET_RAW))
310 goto out_rcu_unlock;
311
312 sock->ops = answer->ops;
313 answer_prot = answer->prot;
314 answer_flags = answer->flags;
315 rcu_read_unlock();
316
317 WARN_ON(answer_prot->slab == NULL);
318
319 err = -ENOBUFS;
320 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
321 if (sk == NULL)
322 goto out;
323
324 err = 0;
325 if (INET_PROTOSW_REUSE & answer_flags)
326 sk->sk_reuse = SK_CAN_REUSE;
327
328 inet = inet_sk(sk);
329 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
330
331 inet->nodefrag = 0;
332
333 if (SOCK_RAW == sock->type) {
334 inet->inet_num = protocol;
335 if (IPPROTO_RAW == protocol)
336 inet->hdrincl = 1;
337 }
338
339 if (net->ipv4.sysctl_ip_no_pmtu_disc)
340 inet->pmtudisc = IP_PMTUDISC_DONT;
341 else
342 inet->pmtudisc = IP_PMTUDISC_WANT;
343
344 inet->inet_id = 0;
345
346 sock_init_data(sock, sk);
347
348 sk->sk_destruct = inet_sock_destruct;
349 sk->sk_protocol = protocol;
350 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
351
352 inet->uc_ttl = -1;
353 inet->mc_loop = 1;
354 inet->mc_ttl = 1;
355 inet->mc_all = 1;
356 inet->mc_index = 0;
357 inet->mc_list = NULL;
358 inet->rcv_tos = 0;
359
360 sk_refcnt_debug_inc(sk);
361
362 if (inet->inet_num) {
363 /* It assumes that any protocol which allows
364 * the user to assign a number at socket
365 * creation time automatically
366 * shares.
367 */
368 inet->inet_sport = htons(inet->inet_num);
369 /* Add to protocol hash chains. */
370 sk->sk_prot->hash(sk);
371 }
372
373 if (sk->sk_prot->init) {
374 err = sk->sk_prot->init(sk);
375 if (err)
376 sk_common_release(sk);
377 }
378 out:
379 return err;
380 out_rcu_unlock:
381 rcu_read_unlock();
382 goto out;
383 }
384
385
386 /*
387 * The peer socket should always be NULL (or else). When we call this
388 * function we are destroying the object and from then on nobody
389 * should refer to it.
390 */
391 int inet_release(struct socket *sock)
392 {
393 struct sock *sk = sock->sk;
394
395 if (sk) {
396 long timeout;
397
398 sock_rps_reset_flow(sk);
399
400 /* Applications forget to leave groups before exiting */
401 ip_mc_drop_socket(sk);
402
403 /* If linger is set, we don't return until the close
404 * is complete. Otherwise we return immediately. The
405 * actually closing is done the same either way.
406 *
407 * If the close is due to the process exiting, we never
408 * linger..
409 */
410 timeout = 0;
411 if (sock_flag(sk, SOCK_LINGER) &&
412 !(current->flags & PF_EXITING))
413 timeout = sk->sk_lingertime;
414 sock->sk = NULL;
415 sk->sk_prot->close(sk, timeout);
416 }
417 return 0;
418 }
419 EXPORT_SYMBOL(inet_release);
420
421 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
422 {
423 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
424 struct sock *sk = sock->sk;
425 struct inet_sock *inet = inet_sk(sk);
426 struct net *net = sock_net(sk);
427 unsigned short snum;
428 int chk_addr_ret;
429 int err;
430
431 /* If the socket has its own bind function then use it. (RAW) */
432 if (sk->sk_prot->bind) {
433 err = sk->sk_prot->bind(sk, uaddr, addr_len);
434 goto out;
435 }
436 err = -EINVAL;
437 if (addr_len < sizeof(struct sockaddr_in))
438 goto out;
439
440 if (addr->sin_family != AF_INET) {
441 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
442 * only if s_addr is INADDR_ANY.
443 */
444 err = -EAFNOSUPPORT;
445 if (addr->sin_family != AF_UNSPEC ||
446 addr->sin_addr.s_addr != htonl(INADDR_ANY))
447 goto out;
448 }
449
450 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
451
452 /* Not specified by any standard per-se, however it breaks too
453 * many applications when removed. It is unfortunate since
454 * allowing applications to make a non-local bind solves
455 * several problems with systems using dynamic addressing.
456 * (ie. your servers still start up even if your ISDN link
457 * is temporarily down)
458 */
459 err = -EADDRNOTAVAIL;
460 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
461 !(inet->freebind || inet->transparent) &&
462 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
463 chk_addr_ret != RTN_LOCAL &&
464 chk_addr_ret != RTN_MULTICAST &&
465 chk_addr_ret != RTN_BROADCAST)
466 goto out;
467
468 snum = ntohs(addr->sin_port);
469 err = -EACCES;
470 if (snum && snum < PROT_SOCK &&
471 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
472 goto out;
473
474 /* We keep a pair of addresses. rcv_saddr is the one
475 * used by hash lookups, and saddr is used for transmit.
476 *
477 * In the BSD API these are the same except where it
478 * would be illegal to use them (multicast/broadcast) in
479 * which case the sending device address is used.
480 */
481 lock_sock(sk);
482
483 /* Check these errors (active socket, double bind). */
484 err = -EINVAL;
485 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
486 goto out_release_sock;
487
488 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
489 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
490 inet->inet_saddr = 0; /* Use device */
491
492 /* Make sure we are allowed to bind here. */
493 if (sk->sk_prot->get_port(sk, snum)) {
494 inet->inet_saddr = inet->inet_rcv_saddr = 0;
495 err = -EADDRINUSE;
496 goto out_release_sock;
497 }
498
499 if (inet->inet_rcv_saddr)
500 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
501 if (snum)
502 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
503 inet->inet_sport = htons(inet->inet_num);
504 inet->inet_daddr = 0;
505 inet->inet_dport = 0;
506 sk_dst_reset(sk);
507 err = 0;
508 out_release_sock:
509 release_sock(sk);
510 out:
511 return err;
512 }
513 EXPORT_SYMBOL(inet_bind);
514
515 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
516 int addr_len, int flags)
517 {
518 struct sock *sk = sock->sk;
519
520 if (addr_len < sizeof(uaddr->sa_family))
521 return -EINVAL;
522 if (uaddr->sa_family == AF_UNSPEC)
523 return sk->sk_prot->disconnect(sk, flags);
524
525 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
526 return -EAGAIN;
527 return sk->sk_prot->connect(sk, uaddr, addr_len);
528 }
529 EXPORT_SYMBOL(inet_dgram_connect);
530
531 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
532 {
533 DEFINE_WAIT(wait);
534
535 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
536 sk->sk_write_pending += writebias;
537
538 /* Basic assumption: if someone sets sk->sk_err, he _must_
539 * change state of the socket from TCP_SYN_*.
540 * Connect() does not allow to get error notifications
541 * without closing the socket.
542 */
543 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
544 release_sock(sk);
545 timeo = schedule_timeout(timeo);
546 lock_sock(sk);
547 if (signal_pending(current) || !timeo)
548 break;
549 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
550 }
551 finish_wait(sk_sleep(sk), &wait);
552 sk->sk_write_pending -= writebias;
553 return timeo;
554 }
555
556 /*
557 * Connect to a remote host. There is regrettably still a little
558 * TCP 'magic' in here.
559 */
560 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
561 int addr_len, int flags)
562 {
563 struct sock *sk = sock->sk;
564 int err;
565 long timeo;
566
567 if (addr_len < sizeof(uaddr->sa_family))
568 return -EINVAL;
569
570 if (uaddr->sa_family == AF_UNSPEC) {
571 err = sk->sk_prot->disconnect(sk, flags);
572 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
573 goto out;
574 }
575
576 switch (sock->state) {
577 default:
578 err = -EINVAL;
579 goto out;
580 case SS_CONNECTED:
581 err = -EISCONN;
582 goto out;
583 case SS_CONNECTING:
584 err = -EALREADY;
585 /* Fall out of switch with err, set for this state */
586 break;
587 case SS_UNCONNECTED:
588 err = -EISCONN;
589 if (sk->sk_state != TCP_CLOSE)
590 goto out;
591
592 err = sk->sk_prot->connect(sk, uaddr, addr_len);
593 if (err < 0)
594 goto out;
595
596 sock->state = SS_CONNECTING;
597
598 /* Just entered SS_CONNECTING state; the only
599 * difference is that return value in non-blocking
600 * case is EINPROGRESS, rather than EALREADY.
601 */
602 err = -EINPROGRESS;
603 break;
604 }
605
606 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
607
608 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
609 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
610 tcp_sk(sk)->fastopen_req &&
611 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
612
613 /* Error code is set above */
614 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
615 goto out;
616
617 err = sock_intr_errno(timeo);
618 if (signal_pending(current))
619 goto out;
620 }
621
622 /* Connection was closed by RST, timeout, ICMP error
623 * or another process disconnected us.
624 */
625 if (sk->sk_state == TCP_CLOSE)
626 goto sock_error;
627
628 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
629 * and error was received after socket entered established state.
630 * Hence, it is handled normally after connect() return successfully.
631 */
632
633 sock->state = SS_CONNECTED;
634 err = 0;
635 out:
636 return err;
637
638 sock_error:
639 err = sock_error(sk) ? : -ECONNABORTED;
640 sock->state = SS_UNCONNECTED;
641 if (sk->sk_prot->disconnect(sk, flags))
642 sock->state = SS_DISCONNECTING;
643 goto out;
644 }
645 EXPORT_SYMBOL(__inet_stream_connect);
646
647 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
648 int addr_len, int flags)
649 {
650 int err;
651
652 lock_sock(sock->sk);
653 err = __inet_stream_connect(sock, uaddr, addr_len, flags);
654 release_sock(sock->sk);
655 return err;
656 }
657 EXPORT_SYMBOL(inet_stream_connect);
658
659 /*
660 * Accept a pending connection. The TCP layer now gives BSD semantics.
661 */
662
663 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
664 {
665 struct sock *sk1 = sock->sk;
666 int err = -EINVAL;
667 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
668
669 if (!sk2)
670 goto do_err;
671
672 lock_sock(sk2);
673
674 sock_rps_record_flow(sk2);
675 WARN_ON(!((1 << sk2->sk_state) &
676 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
677 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
678
679 sock_graft(sk2, newsock);
680
681 newsock->state = SS_CONNECTED;
682 err = 0;
683 release_sock(sk2);
684 do_err:
685 return err;
686 }
687 EXPORT_SYMBOL(inet_accept);
688
689
690 /*
691 * This does both peername and sockname.
692 */
693 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
694 int *uaddr_len, int peer)
695 {
696 struct sock *sk = sock->sk;
697 struct inet_sock *inet = inet_sk(sk);
698 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
699
700 sin->sin_family = AF_INET;
701 if (peer) {
702 if (!inet->inet_dport ||
703 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
704 peer == 1))
705 return -ENOTCONN;
706 sin->sin_port = inet->inet_dport;
707 sin->sin_addr.s_addr = inet->inet_daddr;
708 } else {
709 __be32 addr = inet->inet_rcv_saddr;
710 if (!addr)
711 addr = inet->inet_saddr;
712 sin->sin_port = inet->inet_sport;
713 sin->sin_addr.s_addr = addr;
714 }
715 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
716 *uaddr_len = sizeof(*sin);
717 return 0;
718 }
719 EXPORT_SYMBOL(inet_getname);
720
721 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
722 size_t size)
723 {
724 struct sock *sk = sock->sk;
725
726 sock_rps_record_flow(sk);
727
728 /* We may need to bind the socket. */
729 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
730 inet_autobind(sk))
731 return -EAGAIN;
732
733 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
734 }
735 EXPORT_SYMBOL(inet_sendmsg);
736
737 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
738 size_t size, int flags)
739 {
740 struct sock *sk = sock->sk;
741
742 sock_rps_record_flow(sk);
743
744 /* We may need to bind the socket. */
745 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
746 inet_autobind(sk))
747 return -EAGAIN;
748
749 if (sk->sk_prot->sendpage)
750 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
751 return sock_no_sendpage(sock, page, offset, size, flags);
752 }
753 EXPORT_SYMBOL(inet_sendpage);
754
755 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
756 size_t size, int flags)
757 {
758 struct sock *sk = sock->sk;
759 int addr_len = 0;
760 int err;
761
762 sock_rps_record_flow(sk);
763
764 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
765 flags & ~MSG_DONTWAIT, &addr_len);
766 if (err >= 0)
767 msg->msg_namelen = addr_len;
768 return err;
769 }
770 EXPORT_SYMBOL(inet_recvmsg);
771
772 int inet_shutdown(struct socket *sock, int how)
773 {
774 struct sock *sk = sock->sk;
775 int err = 0;
776
777 /* This should really check to make sure
778 * the socket is a TCP socket. (WHY AC...)
779 */
780 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
781 1->2 bit 2 snds.
782 2->3 */
783 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
784 return -EINVAL;
785
786 lock_sock(sk);
787 if (sock->state == SS_CONNECTING) {
788 if ((1 << sk->sk_state) &
789 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
790 sock->state = SS_DISCONNECTING;
791 else
792 sock->state = SS_CONNECTED;
793 }
794
795 switch (sk->sk_state) {
796 case TCP_CLOSE:
797 err = -ENOTCONN;
798 /* Hack to wake up other listeners, who can poll for
799 POLLHUP, even on eg. unconnected UDP sockets -- RR */
800 default:
801 sk->sk_shutdown |= how;
802 if (sk->sk_prot->shutdown)
803 sk->sk_prot->shutdown(sk, how);
804 break;
805
806 /* Remaining two branches are temporary solution for missing
807 * close() in multithreaded environment. It is _not_ a good idea,
808 * but we have no choice until close() is repaired at VFS level.
809 */
810 case TCP_LISTEN:
811 if (!(how & RCV_SHUTDOWN))
812 break;
813 /* Fall through */
814 case TCP_SYN_SENT:
815 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
816 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
817 break;
818 }
819
820 /* Wake up anyone sleeping in poll. */
821 sk->sk_state_change(sk);
822 release_sock(sk);
823 return err;
824 }
825 EXPORT_SYMBOL(inet_shutdown);
826
827 /*
828 * ioctl() calls you can issue on an INET socket. Most of these are
829 * device configuration and stuff and very rarely used. Some ioctls
830 * pass on to the socket itself.
831 *
832 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
833 * loads the devconfigure module does its configuring and unloads it.
834 * There's a good 20K of config code hanging around the kernel.
835 */
836
837 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
838 {
839 struct sock *sk = sock->sk;
840 int err = 0;
841 struct net *net = sock_net(sk);
842
843 switch (cmd) {
844 case SIOCGSTAMP:
845 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
846 break;
847 case SIOCGSTAMPNS:
848 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
849 break;
850 case SIOCADDRT:
851 case SIOCDELRT:
852 case SIOCRTMSG:
853 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
854 break;
855 case SIOCDARP:
856 case SIOCGARP:
857 case SIOCSARP:
858 err = arp_ioctl(net, cmd, (void __user *)arg);
859 break;
860 case SIOCGIFADDR:
861 case SIOCSIFADDR:
862 case SIOCGIFBRDADDR:
863 case SIOCSIFBRDADDR:
864 case SIOCGIFNETMASK:
865 case SIOCSIFNETMASK:
866 case SIOCGIFDSTADDR:
867 case SIOCSIFDSTADDR:
868 case SIOCSIFPFLAGS:
869 case SIOCGIFPFLAGS:
870 case SIOCSIFFLAGS:
871 err = devinet_ioctl(net, cmd, (void __user *)arg);
872 break;
873 default:
874 if (sk->sk_prot->ioctl)
875 err = sk->sk_prot->ioctl(sk, cmd, arg);
876 else
877 err = -ENOIOCTLCMD;
878 break;
879 }
880 return err;
881 }
882 EXPORT_SYMBOL(inet_ioctl);
883
884 #ifdef CONFIG_COMPAT
885 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
886 {
887 struct sock *sk = sock->sk;
888 int err = -ENOIOCTLCMD;
889
890 if (sk->sk_prot->compat_ioctl)
891 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
892
893 return err;
894 }
895 #endif
896
897 const struct proto_ops inet_stream_ops = {
898 .family = PF_INET,
899 .owner = THIS_MODULE,
900 .release = inet_release,
901 .bind = inet_bind,
902 .connect = inet_stream_connect,
903 .socketpair = sock_no_socketpair,
904 .accept = inet_accept,
905 .getname = inet_getname,
906 .poll = tcp_poll,
907 .ioctl = inet_ioctl,
908 .listen = inet_listen,
909 .shutdown = inet_shutdown,
910 .setsockopt = sock_common_setsockopt,
911 .getsockopt = sock_common_getsockopt,
912 .sendmsg = inet_sendmsg,
913 .recvmsg = inet_recvmsg,
914 .mmap = sock_no_mmap,
915 .sendpage = inet_sendpage,
916 .splice_read = tcp_splice_read,
917 #ifdef CONFIG_COMPAT
918 .compat_setsockopt = compat_sock_common_setsockopt,
919 .compat_getsockopt = compat_sock_common_getsockopt,
920 .compat_ioctl = inet_compat_ioctl,
921 #endif
922 };
923 EXPORT_SYMBOL(inet_stream_ops);
924
925 const struct proto_ops inet_dgram_ops = {
926 .family = PF_INET,
927 .owner = THIS_MODULE,
928 .release = inet_release,
929 .bind = inet_bind,
930 .connect = inet_dgram_connect,
931 .socketpair = sock_no_socketpair,
932 .accept = sock_no_accept,
933 .getname = inet_getname,
934 .poll = udp_poll,
935 .ioctl = inet_ioctl,
936 .listen = sock_no_listen,
937 .shutdown = inet_shutdown,
938 .setsockopt = sock_common_setsockopt,
939 .getsockopt = sock_common_getsockopt,
940 .sendmsg = inet_sendmsg,
941 .recvmsg = inet_recvmsg,
942 .mmap = sock_no_mmap,
943 .sendpage = inet_sendpage,
944 #ifdef CONFIG_COMPAT
945 .compat_setsockopt = compat_sock_common_setsockopt,
946 .compat_getsockopt = compat_sock_common_getsockopt,
947 .compat_ioctl = inet_compat_ioctl,
948 #endif
949 };
950 EXPORT_SYMBOL(inet_dgram_ops);
951
952 /*
953 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
954 * udp_poll
955 */
956 static const struct proto_ops inet_sockraw_ops = {
957 .family = PF_INET,
958 .owner = THIS_MODULE,
959 .release = inet_release,
960 .bind = inet_bind,
961 .connect = inet_dgram_connect,
962 .socketpair = sock_no_socketpair,
963 .accept = sock_no_accept,
964 .getname = inet_getname,
965 .poll = datagram_poll,
966 .ioctl = inet_ioctl,
967 .listen = sock_no_listen,
968 .shutdown = inet_shutdown,
969 .setsockopt = sock_common_setsockopt,
970 .getsockopt = sock_common_getsockopt,
971 .sendmsg = inet_sendmsg,
972 .recvmsg = inet_recvmsg,
973 .mmap = sock_no_mmap,
974 .sendpage = inet_sendpage,
975 #ifdef CONFIG_COMPAT
976 .compat_setsockopt = compat_sock_common_setsockopt,
977 .compat_getsockopt = compat_sock_common_getsockopt,
978 .compat_ioctl = inet_compat_ioctl,
979 #endif
980 };
981
982 static const struct net_proto_family inet_family_ops = {
983 .family = PF_INET,
984 .create = inet_create,
985 .owner = THIS_MODULE,
986 };
987
988 /* Upon startup we insert all the elements in inetsw_array[] into
989 * the linked list inetsw.
990 */
991 static struct inet_protosw inetsw_array[] =
992 {
993 {
994 .type = SOCK_STREAM,
995 .protocol = IPPROTO_TCP,
996 .prot = &tcp_prot,
997 .ops = &inet_stream_ops,
998 .flags = INET_PROTOSW_PERMANENT |
999 INET_PROTOSW_ICSK,
1000 },
1001
1002 {
1003 .type = SOCK_DGRAM,
1004 .protocol = IPPROTO_UDP,
1005 .prot = &udp_prot,
1006 .ops = &inet_dgram_ops,
1007 .flags = INET_PROTOSW_PERMANENT,
1008 },
1009
1010 {
1011 .type = SOCK_DGRAM,
1012 .protocol = IPPROTO_ICMP,
1013 .prot = &ping_prot,
1014 .ops = &inet_dgram_ops,
1015 .flags = INET_PROTOSW_REUSE,
1016 },
1017
1018 {
1019 .type = SOCK_RAW,
1020 .protocol = IPPROTO_IP, /* wild card */
1021 .prot = &raw_prot,
1022 .ops = &inet_sockraw_ops,
1023 .flags = INET_PROTOSW_REUSE,
1024 }
1025 };
1026
1027 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1028
1029 void inet_register_protosw(struct inet_protosw *p)
1030 {
1031 struct list_head *lh;
1032 struct inet_protosw *answer;
1033 int protocol = p->protocol;
1034 struct list_head *last_perm;
1035
1036 spin_lock_bh(&inetsw_lock);
1037
1038 if (p->type >= SOCK_MAX)
1039 goto out_illegal;
1040
1041 /* If we are trying to override a permanent protocol, bail. */
1042 answer = NULL;
1043 last_perm = &inetsw[p->type];
1044 list_for_each(lh, &inetsw[p->type]) {
1045 answer = list_entry(lh, struct inet_protosw, list);
1046
1047 /* Check only the non-wild match. */
1048 if (INET_PROTOSW_PERMANENT & answer->flags) {
1049 if (protocol == answer->protocol)
1050 break;
1051 last_perm = lh;
1052 }
1053
1054 answer = NULL;
1055 }
1056 if (answer)
1057 goto out_permanent;
1058
1059 /* Add the new entry after the last permanent entry if any, so that
1060 * the new entry does not override a permanent entry when matched with
1061 * a wild-card protocol. But it is allowed to override any existing
1062 * non-permanent entry. This means that when we remove this entry, the
1063 * system automatically returns to the old behavior.
1064 */
1065 list_add_rcu(&p->list, last_perm);
1066 out:
1067 spin_unlock_bh(&inetsw_lock);
1068
1069 return;
1070
1071 out_permanent:
1072 pr_err("Attempt to override permanent protocol %d\n", protocol);
1073 goto out;
1074
1075 out_illegal:
1076 pr_err("Ignoring attempt to register invalid socket type %d\n",
1077 p->type);
1078 goto out;
1079 }
1080 EXPORT_SYMBOL(inet_register_protosw);
1081
1082 void inet_unregister_protosw(struct inet_protosw *p)
1083 {
1084 if (INET_PROTOSW_PERMANENT & p->flags) {
1085 pr_err("Attempt to unregister permanent protocol %d\n",
1086 p->protocol);
1087 } else {
1088 spin_lock_bh(&inetsw_lock);
1089 list_del_rcu(&p->list);
1090 spin_unlock_bh(&inetsw_lock);
1091
1092 synchronize_net();
1093 }
1094 }
1095 EXPORT_SYMBOL(inet_unregister_protosw);
1096
1097 /*
1098 * Shall we try to damage output packets if routing dev changes?
1099 */
1100
1101 int sysctl_ip_dynaddr __read_mostly;
1102
1103 static int inet_sk_reselect_saddr(struct sock *sk)
1104 {
1105 struct inet_sock *inet = inet_sk(sk);
1106 __be32 old_saddr = inet->inet_saddr;
1107 __be32 daddr = inet->inet_daddr;
1108 struct flowi4 *fl4;
1109 struct rtable *rt;
1110 __be32 new_saddr;
1111 struct ip_options_rcu *inet_opt;
1112
1113 inet_opt = rcu_dereference_protected(inet->inet_opt,
1114 sock_owned_by_user(sk));
1115 if (inet_opt && inet_opt->opt.srr)
1116 daddr = inet_opt->opt.faddr;
1117
1118 /* Query new route. */
1119 fl4 = &inet->cork.fl.u.ip4;
1120 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1121 sk->sk_bound_dev_if, sk->sk_protocol,
1122 inet->inet_sport, inet->inet_dport, sk);
1123 if (IS_ERR(rt))
1124 return PTR_ERR(rt);
1125
1126 sk_setup_caps(sk, &rt->dst);
1127
1128 new_saddr = fl4->saddr;
1129
1130 if (new_saddr == old_saddr)
1131 return 0;
1132
1133 if (sysctl_ip_dynaddr > 1) {
1134 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1135 __func__, &old_saddr, &new_saddr);
1136 }
1137
1138 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1139
1140 /*
1141 * XXX The only one ugly spot where we need to
1142 * XXX really change the sockets identity after
1143 * XXX it has entered the hashes. -DaveM
1144 *
1145 * Besides that, it does not check for connection
1146 * uniqueness. Wait for troubles.
1147 */
1148 __sk_prot_rehash(sk);
1149 return 0;
1150 }
1151
1152 int inet_sk_rebuild_header(struct sock *sk)
1153 {
1154 struct inet_sock *inet = inet_sk(sk);
1155 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1156 __be32 daddr;
1157 struct ip_options_rcu *inet_opt;
1158 struct flowi4 *fl4;
1159 int err;
1160
1161 /* Route is OK, nothing to do. */
1162 if (rt)
1163 return 0;
1164
1165 /* Reroute. */
1166 rcu_read_lock();
1167 inet_opt = rcu_dereference(inet->inet_opt);
1168 daddr = inet->inet_daddr;
1169 if (inet_opt && inet_opt->opt.srr)
1170 daddr = inet_opt->opt.faddr;
1171 rcu_read_unlock();
1172 fl4 = &inet->cork.fl.u.ip4;
1173 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1174 inet->inet_dport, inet->inet_sport,
1175 sk->sk_protocol, RT_CONN_FLAGS(sk),
1176 sk->sk_bound_dev_if);
1177 if (!IS_ERR(rt)) {
1178 err = 0;
1179 sk_setup_caps(sk, &rt->dst);
1180 } else {
1181 err = PTR_ERR(rt);
1182
1183 /* Routing failed... */
1184 sk->sk_route_caps = 0;
1185 /*
1186 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1187 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1188 */
1189 if (!sysctl_ip_dynaddr ||
1190 sk->sk_state != TCP_SYN_SENT ||
1191 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1192 (err = inet_sk_reselect_saddr(sk)) != 0)
1193 sk->sk_err_soft = -err;
1194 }
1195
1196 return err;
1197 }
1198 EXPORT_SYMBOL(inet_sk_rebuild_header);
1199
1200 static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1201 netdev_features_t features)
1202 {
1203 struct sk_buff *segs = ERR_PTR(-EINVAL);
1204 const struct net_offload *ops;
1205 unsigned int offset = 0;
1206 bool udpfrag, encap;
1207 struct iphdr *iph;
1208 int proto;
1209 int nhoff;
1210 int ihl;
1211 int id;
1212
1213 if (unlikely(skb_shinfo(skb)->gso_type &
1214 ~(SKB_GSO_TCPV4 |
1215 SKB_GSO_UDP |
1216 SKB_GSO_DODGY |
1217 SKB_GSO_TCP_ECN |
1218 SKB_GSO_GRE |
1219 SKB_GSO_GRE_CSUM |
1220 SKB_GSO_IPIP |
1221 SKB_GSO_SIT |
1222 SKB_GSO_TCPV6 |
1223 SKB_GSO_UDP_TUNNEL |
1224 SKB_GSO_UDP_TUNNEL_CSUM |
1225 SKB_GSO_TUNNEL_REMCSUM |
1226 0)))
1227 goto out;
1228
1229 skb_reset_network_header(skb);
1230 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1231 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1232 goto out;
1233
1234 iph = ip_hdr(skb);
1235 ihl = iph->ihl * 4;
1236 if (ihl < sizeof(*iph))
1237 goto out;
1238
1239 id = ntohs(iph->id);
1240 proto = iph->protocol;
1241
1242 /* Warning: after this point, iph might be no longer valid */
1243 if (unlikely(!pskb_may_pull(skb, ihl)))
1244 goto out;
1245 __skb_pull(skb, ihl);
1246
1247 encap = SKB_GSO_CB(skb)->encap_level > 0;
1248 if (encap)
1249 features &= skb->dev->hw_enc_features;
1250 SKB_GSO_CB(skb)->encap_level += ihl;
1251
1252 skb_reset_transport_header(skb);
1253
1254 segs = ERR_PTR(-EPROTONOSUPPORT);
1255
1256 if (skb->encapsulation &&
1257 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP))
1258 udpfrag = proto == IPPROTO_UDP && encap;
1259 else
1260 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation;
1261
1262 ops = rcu_dereference(inet_offloads[proto]);
1263 if (likely(ops && ops->callbacks.gso_segment))
1264 segs = ops->callbacks.gso_segment(skb, features);
1265
1266 if (IS_ERR_OR_NULL(segs))
1267 goto out;
1268
1269 skb = segs;
1270 do {
1271 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1272 if (udpfrag) {
1273 iph->id = htons(id);
1274 iph->frag_off = htons(offset >> 3);
1275 if (skb->next != NULL)
1276 iph->frag_off |= htons(IP_MF);
1277 offset += skb->len - nhoff - ihl;
1278 } else {
1279 iph->id = htons(id++);
1280 }
1281 iph->tot_len = htons(skb->len - nhoff);
1282 ip_send_check(iph);
1283 if (encap)
1284 skb_reset_inner_headers(skb);
1285 skb->network_header = (u8 *)iph - skb->head;
1286 } while ((skb = skb->next));
1287
1288 out:
1289 return segs;
1290 }
1291
1292 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1293 struct sk_buff *skb)
1294 {
1295 const struct net_offload *ops;
1296 struct sk_buff **pp = NULL;
1297 struct sk_buff *p;
1298 const struct iphdr *iph;
1299 unsigned int hlen;
1300 unsigned int off;
1301 unsigned int id;
1302 int flush = 1;
1303 int proto;
1304
1305 off = skb_gro_offset(skb);
1306 hlen = off + sizeof(*iph);
1307 iph = skb_gro_header_fast(skb, off);
1308 if (skb_gro_header_hard(skb, hlen)) {
1309 iph = skb_gro_header_slow(skb, hlen, off);
1310 if (unlikely(!iph))
1311 goto out;
1312 }
1313
1314 proto = iph->protocol;
1315
1316 rcu_read_lock();
1317 ops = rcu_dereference(inet_offloads[proto]);
1318 if (!ops || !ops->callbacks.gro_receive)
1319 goto out_unlock;
1320
1321 if (*(u8 *)iph != 0x45)
1322 goto out_unlock;
1323
1324 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1325 goto out_unlock;
1326
1327 id = ntohl(*(__be32 *)&iph->id);
1328 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1329 id >>= 16;
1330
1331 for (p = *head; p; p = p->next) {
1332 struct iphdr *iph2;
1333
1334 if (!NAPI_GRO_CB(p)->same_flow)
1335 continue;
1336
1337 iph2 = (struct iphdr *)(p->data + off);
1338 /* The above works because, with the exception of the top
1339 * (inner most) layer, we only aggregate pkts with the same
1340 * hdr length so all the hdrs we'll need to verify will start
1341 * at the same offset.
1342 */
1343 if ((iph->protocol ^ iph2->protocol) |
1344 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1345 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1346 NAPI_GRO_CB(p)->same_flow = 0;
1347 continue;
1348 }
1349
1350 /* All fields must match except length and checksum. */
1351 NAPI_GRO_CB(p)->flush |=
1352 (iph->ttl ^ iph2->ttl) |
1353 (iph->tos ^ iph2->tos) |
1354 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1355
1356 /* Save the IP ID check to be included later when we get to
1357 * the transport layer so only the inner most IP ID is checked.
1358 * This is because some GSO/TSO implementations do not
1359 * correctly increment the IP ID for the outer hdrs.
1360 */
1361 NAPI_GRO_CB(p)->flush_id =
1362 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1363 NAPI_GRO_CB(p)->flush |= flush;
1364 }
1365
1366 NAPI_GRO_CB(skb)->flush |= flush;
1367 skb_set_network_header(skb, off);
1368 /* The above will be needed by the transport layer if there is one
1369 * immediately following this IP hdr.
1370 */
1371
1372 /* Note : No need to call skb_gro_postpull_rcsum() here,
1373 * as we already checked checksum over ipv4 header was 0
1374 */
1375 skb_gro_pull(skb, sizeof(*iph));
1376 skb_set_transport_header(skb, skb_gro_offset(skb));
1377
1378 pp = ops->callbacks.gro_receive(head, skb);
1379
1380 out_unlock:
1381 rcu_read_unlock();
1382
1383 out:
1384 NAPI_GRO_CB(skb)->flush |= flush;
1385
1386 return pp;
1387 }
1388
1389 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1390 {
1391 if (sk->sk_family == AF_INET)
1392 return ip_recv_error(sk, msg, len, addr_len);
1393 #if IS_ENABLED(CONFIG_IPV6)
1394 if (sk->sk_family == AF_INET6)
1395 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1396 #endif
1397 return -EINVAL;
1398 }
1399
1400 static int inet_gro_complete(struct sk_buff *skb, int nhoff)
1401 {
1402 __be16 newlen = htons(skb->len - nhoff);
1403 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1404 const struct net_offload *ops;
1405 int proto = iph->protocol;
1406 int err = -ENOSYS;
1407
1408 if (skb->encapsulation)
1409 skb_set_inner_network_header(skb, nhoff);
1410
1411 csum_replace2(&iph->check, iph->tot_len, newlen);
1412 iph->tot_len = newlen;
1413
1414 rcu_read_lock();
1415 ops = rcu_dereference(inet_offloads[proto]);
1416 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1417 goto out_unlock;
1418
1419 /* Only need to add sizeof(*iph) to get to the next hdr below
1420 * because any hdr with option will have been flushed in
1421 * inet_gro_receive().
1422 */
1423 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1424
1425 out_unlock:
1426 rcu_read_unlock();
1427
1428 return err;
1429 }
1430
1431 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1432 unsigned short type, unsigned char protocol,
1433 struct net *net)
1434 {
1435 struct socket *sock;
1436 int rc = sock_create_kern(family, type, protocol, &sock);
1437
1438 if (rc == 0) {
1439 *sk = sock->sk;
1440 (*sk)->sk_allocation = GFP_ATOMIC;
1441 /*
1442 * Unhash it so that IP input processing does not even see it,
1443 * we do not wish this socket to see incoming packets.
1444 */
1445 (*sk)->sk_prot->unhash(*sk);
1446
1447 sk_change_net(*sk, net);
1448 }
1449 return rc;
1450 }
1451 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1452
1453 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1454 {
1455 unsigned long res = 0;
1456 int i;
1457
1458 for_each_possible_cpu(i)
1459 res += *(((unsigned long *) per_cpu_ptr(mib, i)) + offt);
1460 return res;
1461 }
1462 EXPORT_SYMBOL_GPL(snmp_fold_field);
1463
1464 #if BITS_PER_LONG==32
1465
1466 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1467 {
1468 u64 res = 0;
1469 int cpu;
1470
1471 for_each_possible_cpu(cpu) {
1472 void *bhptr;
1473 struct u64_stats_sync *syncp;
1474 u64 v;
1475 unsigned int start;
1476
1477 bhptr = per_cpu_ptr(mib, cpu);
1478 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1479 do {
1480 start = u64_stats_fetch_begin_irq(syncp);
1481 v = *(((u64 *) bhptr) + offt);
1482 } while (u64_stats_fetch_retry_irq(syncp, start));
1483
1484 res += v;
1485 }
1486 return res;
1487 }
1488 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1489 #endif
1490
1491 #ifdef CONFIG_IP_MULTICAST
1492 static const struct net_protocol igmp_protocol = {
1493 .handler = igmp_rcv,
1494 .netns_ok = 1,
1495 };
1496 #endif
1497
1498 static const struct net_protocol tcp_protocol = {
1499 .early_demux = tcp_v4_early_demux,
1500 .handler = tcp_v4_rcv,
1501 .err_handler = tcp_v4_err,
1502 .no_policy = 1,
1503 .netns_ok = 1,
1504 .icmp_strict_tag_validation = 1,
1505 };
1506
1507 static const struct net_protocol udp_protocol = {
1508 .early_demux = udp_v4_early_demux,
1509 .handler = udp_rcv,
1510 .err_handler = udp_err,
1511 .no_policy = 1,
1512 .netns_ok = 1,
1513 };
1514
1515 static const struct net_protocol icmp_protocol = {
1516 .handler = icmp_rcv,
1517 .err_handler = icmp_err,
1518 .no_policy = 1,
1519 .netns_ok = 1,
1520 };
1521
1522 static __net_init int ipv4_mib_init_net(struct net *net)
1523 {
1524 int i;
1525
1526 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1527 if (!net->mib.tcp_statistics)
1528 goto err_tcp_mib;
1529 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1530 if (!net->mib.ip_statistics)
1531 goto err_ip_mib;
1532
1533 for_each_possible_cpu(i) {
1534 struct ipstats_mib *af_inet_stats;
1535 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1536 u64_stats_init(&af_inet_stats->syncp);
1537 }
1538
1539 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1540 if (!net->mib.net_statistics)
1541 goto err_net_mib;
1542 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1543 if (!net->mib.udp_statistics)
1544 goto err_udp_mib;
1545 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1546 if (!net->mib.udplite_statistics)
1547 goto err_udplite_mib;
1548 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1549 if (!net->mib.icmp_statistics)
1550 goto err_icmp_mib;
1551 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1552 GFP_KERNEL);
1553 if (!net->mib.icmpmsg_statistics)
1554 goto err_icmpmsg_mib;
1555
1556 tcp_mib_init(net);
1557 return 0;
1558
1559 err_icmpmsg_mib:
1560 free_percpu(net->mib.icmp_statistics);
1561 err_icmp_mib:
1562 free_percpu(net->mib.udplite_statistics);
1563 err_udplite_mib:
1564 free_percpu(net->mib.udp_statistics);
1565 err_udp_mib:
1566 free_percpu(net->mib.net_statistics);
1567 err_net_mib:
1568 free_percpu(net->mib.ip_statistics);
1569 err_ip_mib:
1570 free_percpu(net->mib.tcp_statistics);
1571 err_tcp_mib:
1572 return -ENOMEM;
1573 }
1574
1575 static __net_exit void ipv4_mib_exit_net(struct net *net)
1576 {
1577 kfree(net->mib.icmpmsg_statistics);
1578 free_percpu(net->mib.icmp_statistics);
1579 free_percpu(net->mib.udplite_statistics);
1580 free_percpu(net->mib.udp_statistics);
1581 free_percpu(net->mib.net_statistics);
1582 free_percpu(net->mib.ip_statistics);
1583 free_percpu(net->mib.tcp_statistics);
1584 }
1585
1586 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1587 .init = ipv4_mib_init_net,
1588 .exit = ipv4_mib_exit_net,
1589 };
1590
1591 static int __init init_ipv4_mibs(void)
1592 {
1593 return register_pernet_subsys(&ipv4_mib_ops);
1594 }
1595
1596 static __net_init int inet_init_net(struct net *net)
1597 {
1598 /*
1599 * Set defaults for local port range
1600 */
1601 seqlock_init(&net->ipv4.ip_local_ports.lock);
1602 net->ipv4.ip_local_ports.range[0] = 32768;
1603 net->ipv4.ip_local_ports.range[1] = 61000;
1604
1605 seqlock_init(&net->ipv4.ping_group_range.lock);
1606 /*
1607 * Sane defaults - nobody may create ping sockets.
1608 * Boot scripts should set this to distro-specific group.
1609 */
1610 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1611 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1612 return 0;
1613 }
1614
1615 static __net_exit void inet_exit_net(struct net *net)
1616 {
1617 }
1618
1619 static __net_initdata struct pernet_operations af_inet_ops = {
1620 .init = inet_init_net,
1621 .exit = inet_exit_net,
1622 };
1623
1624 static int __init init_inet_pernet_ops(void)
1625 {
1626 return register_pernet_subsys(&af_inet_ops);
1627 }
1628
1629 static int ipv4_proc_init(void);
1630
1631 /*
1632 * IP protocol layer initialiser
1633 */
1634
1635 static struct packet_offload ip_packet_offload __read_mostly = {
1636 .type = cpu_to_be16(ETH_P_IP),
1637 .callbacks = {
1638 .gso_segment = inet_gso_segment,
1639 .gro_receive = inet_gro_receive,
1640 .gro_complete = inet_gro_complete,
1641 },
1642 };
1643
1644 static const struct net_offload ipip_offload = {
1645 .callbacks = {
1646 .gso_segment = inet_gso_segment,
1647 .gro_receive = inet_gro_receive,
1648 .gro_complete = inet_gro_complete,
1649 },
1650 };
1651
1652 static int __init ipv4_offload_init(void)
1653 {
1654 /*
1655 * Add offloads
1656 */
1657 if (udpv4_offload_init() < 0)
1658 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1659 if (tcpv4_offload_init() < 0)
1660 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1661
1662 dev_add_offload(&ip_packet_offload);
1663 inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1664 return 0;
1665 }
1666
1667 fs_initcall(ipv4_offload_init);
1668
1669 static struct packet_type ip_packet_type __read_mostly = {
1670 .type = cpu_to_be16(ETH_P_IP),
1671 .func = ip_rcv,
1672 };
1673
1674 static int __init inet_init(void)
1675 {
1676 struct inet_protosw *q;
1677 struct list_head *r;
1678 int rc = -EINVAL;
1679
1680 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
1681
1682 rc = proto_register(&tcp_prot, 1);
1683 if (rc)
1684 goto out;
1685
1686 rc = proto_register(&udp_prot, 1);
1687 if (rc)
1688 goto out_unregister_tcp_proto;
1689
1690 rc = proto_register(&raw_prot, 1);
1691 if (rc)
1692 goto out_unregister_udp_proto;
1693
1694 rc = proto_register(&ping_prot, 1);
1695 if (rc)
1696 goto out_unregister_raw_proto;
1697
1698 /*
1699 * Tell SOCKET that we are alive...
1700 */
1701
1702 (void)sock_register(&inet_family_ops);
1703
1704 #ifdef CONFIG_SYSCTL
1705 ip_static_sysctl_init();
1706 #endif
1707
1708 /*
1709 * Add all the base protocols.
1710 */
1711
1712 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1713 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1714 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1715 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1716 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1717 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1718 #ifdef CONFIG_IP_MULTICAST
1719 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1720 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1721 #endif
1722
1723 /* Register the socket-side information for inet_create. */
1724 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1725 INIT_LIST_HEAD(r);
1726
1727 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1728 inet_register_protosw(q);
1729
1730 /*
1731 * Set the ARP module up
1732 */
1733
1734 arp_init();
1735
1736 /*
1737 * Set the IP module up
1738 */
1739
1740 ip_init();
1741
1742 tcp_v4_init();
1743
1744 /* Setup TCP slab cache for open requests. */
1745 tcp_init();
1746
1747 /* Setup UDP memory threshold */
1748 udp_init();
1749
1750 /* Add UDP-Lite (RFC 3828) */
1751 udplite4_register();
1752
1753 ping_init();
1754
1755 /*
1756 * Set the ICMP layer up
1757 */
1758
1759 if (icmp_init() < 0)
1760 panic("Failed to create the ICMP control socket.\n");
1761
1762 /*
1763 * Initialise the multicast router
1764 */
1765 #if defined(CONFIG_IP_MROUTE)
1766 if (ip_mr_init())
1767 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1768 #endif
1769
1770 if (init_inet_pernet_ops())
1771 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
1772 /*
1773 * Initialise per-cpu ipv4 mibs
1774 */
1775
1776 if (init_ipv4_mibs())
1777 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1778
1779 ipv4_proc_init();
1780
1781 ipfrag_init();
1782
1783 dev_add_pack(&ip_packet_type);
1784
1785 rc = 0;
1786 out:
1787 return rc;
1788 out_unregister_raw_proto:
1789 proto_unregister(&raw_prot);
1790 out_unregister_udp_proto:
1791 proto_unregister(&udp_prot);
1792 out_unregister_tcp_proto:
1793 proto_unregister(&tcp_prot);
1794 goto out;
1795 }
1796
1797 fs_initcall(inet_init);
1798
1799 /* ------------------------------------------------------------------------ */
1800
1801 #ifdef CONFIG_PROC_FS
1802 static int __init ipv4_proc_init(void)
1803 {
1804 int rc = 0;
1805
1806 if (raw_proc_init())
1807 goto out_raw;
1808 if (tcp4_proc_init())
1809 goto out_tcp;
1810 if (udp4_proc_init())
1811 goto out_udp;
1812 if (ping_proc_init())
1813 goto out_ping;
1814 if (ip_misc_proc_init())
1815 goto out_misc;
1816 out:
1817 return rc;
1818 out_misc:
1819 ping_proc_exit();
1820 out_ping:
1821 udp4_proc_exit();
1822 out_udp:
1823 tcp4_proc_exit();
1824 out_tcp:
1825 raw_proc_exit();
1826 out_raw:
1827 rc = -ENOMEM;
1828 goto out;
1829 }
1830
1831 #else /* CONFIG_PROC_FS */
1832 static int __init ipv4_proc_init(void)
1833 {
1834 return 0;
1835 }
1836 #endif /* CONFIG_PROC_FS */
1837
1838 MODULE_ALIAS_NETPROTO(PF_INET);
1839
Linux kernel - Deliverables
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