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drm/i915: Remove duplicated psr.active unset
[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 /* Applications forget to leave groups before exiting */
399 ip_mc_drop_socket(sk);
400
401 /* If linger is set, we don't return until the close
402 * is complete. Otherwise we return immediately. The
403 * actually closing is done the same either way.
404 *
405 * If the close is due to the process exiting, we never
406 * linger..
407 */
408 timeout = 0;
409 if (sock_flag(sk, SOCK_LINGER) &&
410 !(current->flags & PF_EXITING))
411 timeout = sk->sk_lingertime;
412 sock->sk = NULL;
413 sk->sk_prot->close(sk, timeout);
414 }
415 return 0;
416 }
417 EXPORT_SYMBOL(inet_release);
418
419 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
420 {
421 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
422 struct sock *sk = sock->sk;
423 struct inet_sock *inet = inet_sk(sk);
424 struct net *net = sock_net(sk);
425 unsigned short snum;
426 int chk_addr_ret;
427 int err;
428
429 /* If the socket has its own bind function then use it. (RAW) */
430 if (sk->sk_prot->bind) {
431 err = sk->sk_prot->bind(sk, uaddr, addr_len);
432 goto out;
433 }
434 err = -EINVAL;
435 if (addr_len < sizeof(struct sockaddr_in))
436 goto out;
437
438 if (addr->sin_family != AF_INET) {
439 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
440 * only if s_addr is INADDR_ANY.
441 */
442 err = -EAFNOSUPPORT;
443 if (addr->sin_family != AF_UNSPEC ||
444 addr->sin_addr.s_addr != htonl(INADDR_ANY))
445 goto out;
446 }
447
448 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
449
450 /* Not specified by any standard per-se, however it breaks too
451 * many applications when removed. It is unfortunate since
452 * allowing applications to make a non-local bind solves
453 * several problems with systems using dynamic addressing.
454 * (ie. your servers still start up even if your ISDN link
455 * is temporarily down)
456 */
457 err = -EADDRNOTAVAIL;
458 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
459 !(inet->freebind || inet->transparent) &&
460 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
461 chk_addr_ret != RTN_LOCAL &&
462 chk_addr_ret != RTN_MULTICAST &&
463 chk_addr_ret != RTN_BROADCAST)
464 goto out;
465
466 snum = ntohs(addr->sin_port);
467 err = -EACCES;
468 if (snum && snum < PROT_SOCK &&
469 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
470 goto out;
471
472 /* We keep a pair of addresses. rcv_saddr is the one
473 * used by hash lookups, and saddr is used for transmit.
474 *
475 * In the BSD API these are the same except where it
476 * would be illegal to use them (multicast/broadcast) in
477 * which case the sending device address is used.
478 */
479 lock_sock(sk);
480
481 /* Check these errors (active socket, double bind). */
482 err = -EINVAL;
483 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
484 goto out_release_sock;
485
486 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
487 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
488 inet->inet_saddr = 0; /* Use device */
489
490 /* Make sure we are allowed to bind here. */
491 if (sk->sk_prot->get_port(sk, snum)) {
492 inet->inet_saddr = inet->inet_rcv_saddr = 0;
493 err = -EADDRINUSE;
494 goto out_release_sock;
495 }
496
497 if (inet->inet_rcv_saddr)
498 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
499 if (snum)
500 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
501 inet->inet_sport = htons(inet->inet_num);
502 inet->inet_daddr = 0;
503 inet->inet_dport = 0;
504 sk_dst_reset(sk);
505 err = 0;
506 out_release_sock:
507 release_sock(sk);
508 out:
509 return err;
510 }
511 EXPORT_SYMBOL(inet_bind);
512
513 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
514 int addr_len, int flags)
515 {
516 struct sock *sk = sock->sk;
517
518 if (addr_len < sizeof(uaddr->sa_family))
519 return -EINVAL;
520 if (uaddr->sa_family == AF_UNSPEC)
521 return sk->sk_prot->disconnect(sk, flags);
522
523 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
524 return -EAGAIN;
525 return sk->sk_prot->connect(sk, uaddr, addr_len);
526 }
527 EXPORT_SYMBOL(inet_dgram_connect);
528
529 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
530 {
531 DEFINE_WAIT(wait);
532
533 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
534 sk->sk_write_pending += writebias;
535
536 /* Basic assumption: if someone sets sk->sk_err, he _must_
537 * change state of the socket from TCP_SYN_*.
538 * Connect() does not allow to get error notifications
539 * without closing the socket.
540 */
541 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
542 release_sock(sk);
543 timeo = schedule_timeout(timeo);
544 lock_sock(sk);
545 if (signal_pending(current) || !timeo)
546 break;
547 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
548 }
549 finish_wait(sk_sleep(sk), &wait);
550 sk->sk_write_pending -= writebias;
551 return timeo;
552 }
553
554 /*
555 * Connect to a remote host. There is regrettably still a little
556 * TCP 'magic' in here.
557 */
558 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
559 int addr_len, int flags)
560 {
561 struct sock *sk = sock->sk;
562 int err;
563 long timeo;
564
565 if (addr_len < sizeof(uaddr->sa_family))
566 return -EINVAL;
567
568 if (uaddr->sa_family == AF_UNSPEC) {
569 err = sk->sk_prot->disconnect(sk, flags);
570 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
571 goto out;
572 }
573
574 switch (sock->state) {
575 default:
576 err = -EINVAL;
577 goto out;
578 case SS_CONNECTED:
579 err = -EISCONN;
580 goto out;
581 case SS_CONNECTING:
582 err = -EALREADY;
583 /* Fall out of switch with err, set for this state */
584 break;
585 case SS_UNCONNECTED:
586 err = -EISCONN;
587 if (sk->sk_state != TCP_CLOSE)
588 goto out;
589
590 err = sk->sk_prot->connect(sk, uaddr, addr_len);
591 if (err < 0)
592 goto out;
593
594 sock->state = SS_CONNECTING;
595
596 /* Just entered SS_CONNECTING state; the only
597 * difference is that return value in non-blocking
598 * case is EINPROGRESS, rather than EALREADY.
599 */
600 err = -EINPROGRESS;
601 break;
602 }
603
604 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
605
606 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
607 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
608 tcp_sk(sk)->fastopen_req &&
609 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
610
611 /* Error code is set above */
612 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
613 goto out;
614
615 err = sock_intr_errno(timeo);
616 if (signal_pending(current))
617 goto out;
618 }
619
620 /* Connection was closed by RST, timeout, ICMP error
621 * or another process disconnected us.
622 */
623 if (sk->sk_state == TCP_CLOSE)
624 goto sock_error;
625
626 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
627 * and error was received after socket entered established state.
628 * Hence, it is handled normally after connect() return successfully.
629 */
630
631 sock->state = SS_CONNECTED;
632 err = 0;
633 out:
634 return err;
635
636 sock_error:
637 err = sock_error(sk) ? : -ECONNABORTED;
638 sock->state = SS_UNCONNECTED;
639 if (sk->sk_prot->disconnect(sk, flags))
640 sock->state = SS_DISCONNECTING;
641 goto out;
642 }
643 EXPORT_SYMBOL(__inet_stream_connect);
644
645 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
646 int addr_len, int flags)
647 {
648 int err;
649
650 lock_sock(sock->sk);
651 err = __inet_stream_connect(sock, uaddr, addr_len, flags);
652 release_sock(sock->sk);
653 return err;
654 }
655 EXPORT_SYMBOL(inet_stream_connect);
656
657 /*
658 * Accept a pending connection. The TCP layer now gives BSD semantics.
659 */
660
661 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
662 {
663 struct sock *sk1 = sock->sk;
664 int err = -EINVAL;
665 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
666
667 if (!sk2)
668 goto do_err;
669
670 lock_sock(sk2);
671
672 sock_rps_record_flow(sk2);
673 WARN_ON(!((1 << sk2->sk_state) &
674 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
675 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
676
677 sock_graft(sk2, newsock);
678
679 newsock->state = SS_CONNECTED;
680 err = 0;
681 release_sock(sk2);
682 do_err:
683 return err;
684 }
685 EXPORT_SYMBOL(inet_accept);
686
687
688 /*
689 * This does both peername and sockname.
690 */
691 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
692 int *uaddr_len, int peer)
693 {
694 struct sock *sk = sock->sk;
695 struct inet_sock *inet = inet_sk(sk);
696 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
697
698 sin->sin_family = AF_INET;
699 if (peer) {
700 if (!inet->inet_dport ||
701 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
702 peer == 1))
703 return -ENOTCONN;
704 sin->sin_port = inet->inet_dport;
705 sin->sin_addr.s_addr = inet->inet_daddr;
706 } else {
707 __be32 addr = inet->inet_rcv_saddr;
708 if (!addr)
709 addr = inet->inet_saddr;
710 sin->sin_port = inet->inet_sport;
711 sin->sin_addr.s_addr = addr;
712 }
713 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
714 *uaddr_len = sizeof(*sin);
715 return 0;
716 }
717 EXPORT_SYMBOL(inet_getname);
718
719 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
720 size_t size)
721 {
722 struct sock *sk = sock->sk;
723
724 sock_rps_record_flow(sk);
725
726 /* We may need to bind the socket. */
727 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
728 inet_autobind(sk))
729 return -EAGAIN;
730
731 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
732 }
733 EXPORT_SYMBOL(inet_sendmsg);
734
735 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
736 size_t size, int flags)
737 {
738 struct sock *sk = sock->sk;
739
740 sock_rps_record_flow(sk);
741
742 /* We may need to bind the socket. */
743 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
744 inet_autobind(sk))
745 return -EAGAIN;
746
747 if (sk->sk_prot->sendpage)
748 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
749 return sock_no_sendpage(sock, page, offset, size, flags);
750 }
751 EXPORT_SYMBOL(inet_sendpage);
752
753 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
754 size_t size, int flags)
755 {
756 struct sock *sk = sock->sk;
757 int addr_len = 0;
758 int err;
759
760 sock_rps_record_flow(sk);
761
762 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
763 flags & ~MSG_DONTWAIT, &addr_len);
764 if (err >= 0)
765 msg->msg_namelen = addr_len;
766 return err;
767 }
768 EXPORT_SYMBOL(inet_recvmsg);
769
770 int inet_shutdown(struct socket *sock, int how)
771 {
772 struct sock *sk = sock->sk;
773 int err = 0;
774
775 /* This should really check to make sure
776 * the socket is a TCP socket. (WHY AC...)
777 */
778 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
779 1->2 bit 2 snds.
780 2->3 */
781 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
782 return -EINVAL;
783
784 lock_sock(sk);
785 if (sock->state == SS_CONNECTING) {
786 if ((1 << sk->sk_state) &
787 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
788 sock->state = SS_DISCONNECTING;
789 else
790 sock->state = SS_CONNECTED;
791 }
792
793 switch (sk->sk_state) {
794 case TCP_CLOSE:
795 err = -ENOTCONN;
796 /* Hack to wake up other listeners, who can poll for
797 POLLHUP, even on eg. unconnected UDP sockets -- RR */
798 default:
799 sk->sk_shutdown |= how;
800 if (sk->sk_prot->shutdown)
801 sk->sk_prot->shutdown(sk, how);
802 break;
803
804 /* Remaining two branches are temporary solution for missing
805 * close() in multithreaded environment. It is _not_ a good idea,
806 * but we have no choice until close() is repaired at VFS level.
807 */
808 case TCP_LISTEN:
809 if (!(how & RCV_SHUTDOWN))
810 break;
811 /* Fall through */
812 case TCP_SYN_SENT:
813 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
814 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
815 break;
816 }
817
818 /* Wake up anyone sleeping in poll. */
819 sk->sk_state_change(sk);
820 release_sock(sk);
821 return err;
822 }
823 EXPORT_SYMBOL(inet_shutdown);
824
825 /*
826 * ioctl() calls you can issue on an INET socket. Most of these are
827 * device configuration and stuff and very rarely used. Some ioctls
828 * pass on to the socket itself.
829 *
830 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
831 * loads the devconfigure module does its configuring and unloads it.
832 * There's a good 20K of config code hanging around the kernel.
833 */
834
835 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
836 {
837 struct sock *sk = sock->sk;
838 int err = 0;
839 struct net *net = sock_net(sk);
840
841 switch (cmd) {
842 case SIOCGSTAMP:
843 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
844 break;
845 case SIOCGSTAMPNS:
846 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
847 break;
848 case SIOCADDRT:
849 case SIOCDELRT:
850 case SIOCRTMSG:
851 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
852 break;
853 case SIOCDARP:
854 case SIOCGARP:
855 case SIOCSARP:
856 err = arp_ioctl(net, cmd, (void __user *)arg);
857 break;
858 case SIOCGIFADDR:
859 case SIOCSIFADDR:
860 case SIOCGIFBRDADDR:
861 case SIOCSIFBRDADDR:
862 case SIOCGIFNETMASK:
863 case SIOCSIFNETMASK:
864 case SIOCGIFDSTADDR:
865 case SIOCSIFDSTADDR:
866 case SIOCSIFPFLAGS:
867 case SIOCGIFPFLAGS:
868 case SIOCSIFFLAGS:
869 err = devinet_ioctl(net, cmd, (void __user *)arg);
870 break;
871 default:
872 if (sk->sk_prot->ioctl)
873 err = sk->sk_prot->ioctl(sk, cmd, arg);
874 else
875 err = -ENOIOCTLCMD;
876 break;
877 }
878 return err;
879 }
880 EXPORT_SYMBOL(inet_ioctl);
881
882 #ifdef CONFIG_COMPAT
883 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
884 {
885 struct sock *sk = sock->sk;
886 int err = -ENOIOCTLCMD;
887
888 if (sk->sk_prot->compat_ioctl)
889 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
890
891 return err;
892 }
893 #endif
894
895 const struct proto_ops inet_stream_ops = {
896 .family = PF_INET,
897 .owner = THIS_MODULE,
898 .release = inet_release,
899 .bind = inet_bind,
900 .connect = inet_stream_connect,
901 .socketpair = sock_no_socketpair,
902 .accept = inet_accept,
903 .getname = inet_getname,
904 .poll = tcp_poll,
905 .ioctl = inet_ioctl,
906 .listen = inet_listen,
907 .shutdown = inet_shutdown,
908 .setsockopt = sock_common_setsockopt,
909 .getsockopt = sock_common_getsockopt,
910 .sendmsg = inet_sendmsg,
911 .recvmsg = inet_recvmsg,
912 .mmap = sock_no_mmap,
913 .sendpage = inet_sendpage,
914 .splice_read = tcp_splice_read,
915 #ifdef CONFIG_COMPAT
916 .compat_setsockopt = compat_sock_common_setsockopt,
917 .compat_getsockopt = compat_sock_common_getsockopt,
918 .compat_ioctl = inet_compat_ioctl,
919 #endif
920 };
921 EXPORT_SYMBOL(inet_stream_ops);
922
923 const struct proto_ops inet_dgram_ops = {
924 .family = PF_INET,
925 .owner = THIS_MODULE,
926 .release = inet_release,
927 .bind = inet_bind,
928 .connect = inet_dgram_connect,
929 .socketpair = sock_no_socketpair,
930 .accept = sock_no_accept,
931 .getname = inet_getname,
932 .poll = udp_poll,
933 .ioctl = inet_ioctl,
934 .listen = sock_no_listen,
935 .shutdown = inet_shutdown,
936 .setsockopt = sock_common_setsockopt,
937 .getsockopt = sock_common_getsockopt,
938 .sendmsg = inet_sendmsg,
939 .recvmsg = inet_recvmsg,
940 .mmap = sock_no_mmap,
941 .sendpage = inet_sendpage,
942 #ifdef CONFIG_COMPAT
943 .compat_setsockopt = compat_sock_common_setsockopt,
944 .compat_getsockopt = compat_sock_common_getsockopt,
945 .compat_ioctl = inet_compat_ioctl,
946 #endif
947 };
948 EXPORT_SYMBOL(inet_dgram_ops);
949
950 /*
951 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
952 * udp_poll
953 */
954 static const struct proto_ops inet_sockraw_ops = {
955 .family = PF_INET,
956 .owner = THIS_MODULE,
957 .release = inet_release,
958 .bind = inet_bind,
959 .connect = inet_dgram_connect,
960 .socketpair = sock_no_socketpair,
961 .accept = sock_no_accept,
962 .getname = inet_getname,
963 .poll = datagram_poll,
964 .ioctl = inet_ioctl,
965 .listen = sock_no_listen,
966 .shutdown = inet_shutdown,
967 .setsockopt = sock_common_setsockopt,
968 .getsockopt = sock_common_getsockopt,
969 .sendmsg = inet_sendmsg,
970 .recvmsg = inet_recvmsg,
971 .mmap = sock_no_mmap,
972 .sendpage = inet_sendpage,
973 #ifdef CONFIG_COMPAT
974 .compat_setsockopt = compat_sock_common_setsockopt,
975 .compat_getsockopt = compat_sock_common_getsockopt,
976 .compat_ioctl = inet_compat_ioctl,
977 #endif
978 };
979
980 static const struct net_proto_family inet_family_ops = {
981 .family = PF_INET,
982 .create = inet_create,
983 .owner = THIS_MODULE,
984 };
985
986 /* Upon startup we insert all the elements in inetsw_array[] into
987 * the linked list inetsw.
988 */
989 static struct inet_protosw inetsw_array[] =
990 {
991 {
992 .type = SOCK_STREAM,
993 .protocol = IPPROTO_TCP,
994 .prot = &tcp_prot,
995 .ops = &inet_stream_ops,
996 .flags = INET_PROTOSW_PERMANENT |
997 INET_PROTOSW_ICSK,
998 },
999
1000 {
1001 .type = SOCK_DGRAM,
1002 .protocol = IPPROTO_UDP,
1003 .prot = &udp_prot,
1004 .ops = &inet_dgram_ops,
1005 .flags = INET_PROTOSW_PERMANENT,
1006 },
1007
1008 {
1009 .type = SOCK_DGRAM,
1010 .protocol = IPPROTO_ICMP,
1011 .prot = &ping_prot,
1012 .ops = &inet_dgram_ops,
1013 .flags = INET_PROTOSW_REUSE,
1014 },
1015
1016 {
1017 .type = SOCK_RAW,
1018 .protocol = IPPROTO_IP, /* wild card */
1019 .prot = &raw_prot,
1020 .ops = &inet_sockraw_ops,
1021 .flags = INET_PROTOSW_REUSE,
1022 }
1023 };
1024
1025 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1026
1027 void inet_register_protosw(struct inet_protosw *p)
1028 {
1029 struct list_head *lh;
1030 struct inet_protosw *answer;
1031 int protocol = p->protocol;
1032 struct list_head *last_perm;
1033
1034 spin_lock_bh(&inetsw_lock);
1035
1036 if (p->type >= SOCK_MAX)
1037 goto out_illegal;
1038
1039 /* If we are trying to override a permanent protocol, bail. */
1040 answer = NULL;
1041 last_perm = &inetsw[p->type];
1042 list_for_each(lh, &inetsw[p->type]) {
1043 answer = list_entry(lh, struct inet_protosw, list);
1044
1045 /* Check only the non-wild match. */
1046 if (INET_PROTOSW_PERMANENT & answer->flags) {
1047 if (protocol == answer->protocol)
1048 break;
1049 last_perm = lh;
1050 }
1051
1052 answer = NULL;
1053 }
1054 if (answer)
1055 goto out_permanent;
1056
1057 /* Add the new entry after the last permanent entry if any, so that
1058 * the new entry does not override a permanent entry when matched with
1059 * a wild-card protocol. But it is allowed to override any existing
1060 * non-permanent entry. This means that when we remove this entry, the
1061 * system automatically returns to the old behavior.
1062 */
1063 list_add_rcu(&p->list, last_perm);
1064 out:
1065 spin_unlock_bh(&inetsw_lock);
1066
1067 return;
1068
1069 out_permanent:
1070 pr_err("Attempt to override permanent protocol %d\n", protocol);
1071 goto out;
1072
1073 out_illegal:
1074 pr_err("Ignoring attempt to register invalid socket type %d\n",
1075 p->type);
1076 goto out;
1077 }
1078 EXPORT_SYMBOL(inet_register_protosw);
1079
1080 void inet_unregister_protosw(struct inet_protosw *p)
1081 {
1082 if (INET_PROTOSW_PERMANENT & p->flags) {
1083 pr_err("Attempt to unregister permanent protocol %d\n",
1084 p->protocol);
1085 } else {
1086 spin_lock_bh(&inetsw_lock);
1087 list_del_rcu(&p->list);
1088 spin_unlock_bh(&inetsw_lock);
1089
1090 synchronize_net();
1091 }
1092 }
1093 EXPORT_SYMBOL(inet_unregister_protosw);
1094
1095 /*
1096 * Shall we try to damage output packets if routing dev changes?
1097 */
1098
1099 int sysctl_ip_dynaddr __read_mostly;
1100
1101 static int inet_sk_reselect_saddr(struct sock *sk)
1102 {
1103 struct inet_sock *inet = inet_sk(sk);
1104 __be32 old_saddr = inet->inet_saddr;
1105 __be32 daddr = inet->inet_daddr;
1106 struct flowi4 *fl4;
1107 struct rtable *rt;
1108 __be32 new_saddr;
1109 struct ip_options_rcu *inet_opt;
1110
1111 inet_opt = rcu_dereference_protected(inet->inet_opt,
1112 sock_owned_by_user(sk));
1113 if (inet_opt && inet_opt->opt.srr)
1114 daddr = inet_opt->opt.faddr;
1115
1116 /* Query new route. */
1117 fl4 = &inet->cork.fl.u.ip4;
1118 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1119 sk->sk_bound_dev_if, sk->sk_protocol,
1120 inet->inet_sport, inet->inet_dport, sk);
1121 if (IS_ERR(rt))
1122 return PTR_ERR(rt);
1123
1124 sk_setup_caps(sk, &rt->dst);
1125
1126 new_saddr = fl4->saddr;
1127
1128 if (new_saddr == old_saddr)
1129 return 0;
1130
1131 if (sysctl_ip_dynaddr > 1) {
1132 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1133 __func__, &old_saddr, &new_saddr);
1134 }
1135
1136 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1137
1138 /*
1139 * XXX The only one ugly spot where we need to
1140 * XXX really change the sockets identity after
1141 * XXX it has entered the hashes. -DaveM
1142 *
1143 * Besides that, it does not check for connection
1144 * uniqueness. Wait for troubles.
1145 */
1146 __sk_prot_rehash(sk);
1147 return 0;
1148 }
1149
1150 int inet_sk_rebuild_header(struct sock *sk)
1151 {
1152 struct inet_sock *inet = inet_sk(sk);
1153 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1154 __be32 daddr;
1155 struct ip_options_rcu *inet_opt;
1156 struct flowi4 *fl4;
1157 int err;
1158
1159 /* Route is OK, nothing to do. */
1160 if (rt)
1161 return 0;
1162
1163 /* Reroute. */
1164 rcu_read_lock();
1165 inet_opt = rcu_dereference(inet->inet_opt);
1166 daddr = inet->inet_daddr;
1167 if (inet_opt && inet_opt->opt.srr)
1168 daddr = inet_opt->opt.faddr;
1169 rcu_read_unlock();
1170 fl4 = &inet->cork.fl.u.ip4;
1171 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1172 inet->inet_dport, inet->inet_sport,
1173 sk->sk_protocol, RT_CONN_FLAGS(sk),
1174 sk->sk_bound_dev_if);
1175 if (!IS_ERR(rt)) {
1176 err = 0;
1177 sk_setup_caps(sk, &rt->dst);
1178 } else {
1179 err = PTR_ERR(rt);
1180
1181 /* Routing failed... */
1182 sk->sk_route_caps = 0;
1183 /*
1184 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1185 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1186 */
1187 if (!sysctl_ip_dynaddr ||
1188 sk->sk_state != TCP_SYN_SENT ||
1189 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1190 (err = inet_sk_reselect_saddr(sk)) != 0)
1191 sk->sk_err_soft = -err;
1192 }
1193
1194 return err;
1195 }
1196 EXPORT_SYMBOL(inet_sk_rebuild_header);
1197
1198 static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1199 netdev_features_t features)
1200 {
1201 struct sk_buff *segs = ERR_PTR(-EINVAL);
1202 const struct net_offload *ops;
1203 unsigned int offset = 0;
1204 bool udpfrag, encap;
1205 struct iphdr *iph;
1206 int proto;
1207 int nhoff;
1208 int ihl;
1209 int id;
1210
1211 if (unlikely(skb_shinfo(skb)->gso_type &
1212 ~(SKB_GSO_TCPV4 |
1213 SKB_GSO_UDP |
1214 SKB_GSO_DODGY |
1215 SKB_GSO_TCP_ECN |
1216 SKB_GSO_GRE |
1217 SKB_GSO_GRE_CSUM |
1218 SKB_GSO_IPIP |
1219 SKB_GSO_SIT |
1220 SKB_GSO_TCPV6 |
1221 SKB_GSO_UDP_TUNNEL |
1222 SKB_GSO_UDP_TUNNEL_CSUM |
1223 SKB_GSO_TUNNEL_REMCSUM |
1224 0)))
1225 goto out;
1226
1227 skb_reset_network_header(skb);
1228 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1229 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1230 goto out;
1231
1232 iph = ip_hdr(skb);
1233 ihl = iph->ihl * 4;
1234 if (ihl < sizeof(*iph))
1235 goto out;
1236
1237 id = ntohs(iph->id);
1238 proto = iph->protocol;
1239
1240 /* Warning: after this point, iph might be no longer valid */
1241 if (unlikely(!pskb_may_pull(skb, ihl)))
1242 goto out;
1243 __skb_pull(skb, ihl);
1244
1245 encap = SKB_GSO_CB(skb)->encap_level > 0;
1246 if (encap)
1247 features &= skb->dev->hw_enc_features;
1248 SKB_GSO_CB(skb)->encap_level += ihl;
1249
1250 skb_reset_transport_header(skb);
1251
1252 segs = ERR_PTR(-EPROTONOSUPPORT);
1253
1254 if (skb->encapsulation &&
1255 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP))
1256 udpfrag = proto == IPPROTO_UDP && encap;
1257 else
1258 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation;
1259
1260 ops = rcu_dereference(inet_offloads[proto]);
1261 if (likely(ops && ops->callbacks.gso_segment))
1262 segs = ops->callbacks.gso_segment(skb, features);
1263
1264 if (IS_ERR_OR_NULL(segs))
1265 goto out;
1266
1267 skb = segs;
1268 do {
1269 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1270 if (udpfrag) {
1271 iph->id = htons(id);
1272 iph->frag_off = htons(offset >> 3);
1273 if (skb->next != NULL)
1274 iph->frag_off |= htons(IP_MF);
1275 offset += skb->len - nhoff - ihl;
1276 } else {
1277 iph->id = htons(id++);
1278 }
1279 iph->tot_len = htons(skb->len - nhoff);
1280 ip_send_check(iph);
1281 if (encap)
1282 skb_reset_inner_headers(skb);
1283 skb->network_header = (u8 *)iph - skb->head;
1284 } while ((skb = skb->next));
1285
1286 out:
1287 return segs;
1288 }
1289
1290 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1291 struct sk_buff *skb)
1292 {
1293 const struct net_offload *ops;
1294 struct sk_buff **pp = NULL;
1295 struct sk_buff *p;
1296 const struct iphdr *iph;
1297 unsigned int hlen;
1298 unsigned int off;
1299 unsigned int id;
1300 int flush = 1;
1301 int proto;
1302
1303 off = skb_gro_offset(skb);
1304 hlen = off + sizeof(*iph);
1305 iph = skb_gro_header_fast(skb, off);
1306 if (skb_gro_header_hard(skb, hlen)) {
1307 iph = skb_gro_header_slow(skb, hlen, off);
1308 if (unlikely(!iph))
1309 goto out;
1310 }
1311
1312 proto = iph->protocol;
1313
1314 rcu_read_lock();
1315 ops = rcu_dereference(inet_offloads[proto]);
1316 if (!ops || !ops->callbacks.gro_receive)
1317 goto out_unlock;
1318
1319 if (*(u8 *)iph != 0x45)
1320 goto out_unlock;
1321
1322 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1323 goto out_unlock;
1324
1325 id = ntohl(*(__be32 *)&iph->id);
1326 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1327 id >>= 16;
1328
1329 for (p = *head; p; p = p->next) {
1330 struct iphdr *iph2;
1331
1332 if (!NAPI_GRO_CB(p)->same_flow)
1333 continue;
1334
1335 iph2 = (struct iphdr *)(p->data + off);
1336 /* The above works because, with the exception of the top
1337 * (inner most) layer, we only aggregate pkts with the same
1338 * hdr length so all the hdrs we'll need to verify will start
1339 * at the same offset.
1340 */
1341 if ((iph->protocol ^ iph2->protocol) |
1342 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1343 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1344 NAPI_GRO_CB(p)->same_flow = 0;
1345 continue;
1346 }
1347
1348 /* All fields must match except length and checksum. */
1349 NAPI_GRO_CB(p)->flush |=
1350 (iph->ttl ^ iph2->ttl) |
1351 (iph->tos ^ iph2->tos) |
1352 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1353
1354 /* Save the IP ID check to be included later when we get to
1355 * the transport layer so only the inner most IP ID is checked.
1356 * This is because some GSO/TSO implementations do not
1357 * correctly increment the IP ID for the outer hdrs.
1358 */
1359 NAPI_GRO_CB(p)->flush_id =
1360 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1361 NAPI_GRO_CB(p)->flush |= flush;
1362 }
1363
1364 NAPI_GRO_CB(skb)->flush |= flush;
1365 skb_set_network_header(skb, off);
1366 /* The above will be needed by the transport layer if there is one
1367 * immediately following this IP hdr.
1368 */
1369
1370 /* Note : No need to call skb_gro_postpull_rcsum() here,
1371 * as we already checked checksum over ipv4 header was 0
1372 */
1373 skb_gro_pull(skb, sizeof(*iph));
1374 skb_set_transport_header(skb, skb_gro_offset(skb));
1375
1376 pp = ops->callbacks.gro_receive(head, skb);
1377
1378 out_unlock:
1379 rcu_read_unlock();
1380
1381 out:
1382 NAPI_GRO_CB(skb)->flush |= flush;
1383
1384 return pp;
1385 }
1386
1387 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1388 {
1389 if (sk->sk_family == AF_INET)
1390 return ip_recv_error(sk, msg, len, addr_len);
1391 #if IS_ENABLED(CONFIG_IPV6)
1392 if (sk->sk_family == AF_INET6)
1393 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1394 #endif
1395 return -EINVAL;
1396 }
1397
1398 static int inet_gro_complete(struct sk_buff *skb, int nhoff)
1399 {
1400 __be16 newlen = htons(skb->len - nhoff);
1401 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1402 const struct net_offload *ops;
1403 int proto = iph->protocol;
1404 int err = -ENOSYS;
1405
1406 if (skb->encapsulation)
1407 skb_set_inner_network_header(skb, nhoff);
1408
1409 csum_replace2(&iph->check, iph->tot_len, newlen);
1410 iph->tot_len = newlen;
1411
1412 rcu_read_lock();
1413 ops = rcu_dereference(inet_offloads[proto]);
1414 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1415 goto out_unlock;
1416
1417 /* Only need to add sizeof(*iph) to get to the next hdr below
1418 * because any hdr with option will have been flushed in
1419 * inet_gro_receive().
1420 */
1421 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1422
1423 out_unlock:
1424 rcu_read_unlock();
1425
1426 return err;
1427 }
1428
1429 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1430 unsigned short type, unsigned char protocol,
1431 struct net *net)
1432 {
1433 struct socket *sock;
1434 int rc = sock_create_kern(family, type, protocol, &sock);
1435
1436 if (rc == 0) {
1437 *sk = sock->sk;
1438 (*sk)->sk_allocation = GFP_ATOMIC;
1439 /*
1440 * Unhash it so that IP input processing does not even see it,
1441 * we do not wish this socket to see incoming packets.
1442 */
1443 (*sk)->sk_prot->unhash(*sk);
1444
1445 sk_change_net(*sk, net);
1446 }
1447 return rc;
1448 }
1449 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1450
1451 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1452 {
1453 unsigned long res = 0;
1454 int i;
1455
1456 for_each_possible_cpu(i)
1457 res += *(((unsigned long *) per_cpu_ptr(mib, i)) + offt);
1458 return res;
1459 }
1460 EXPORT_SYMBOL_GPL(snmp_fold_field);
1461
1462 #if BITS_PER_LONG==32
1463
1464 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1465 {
1466 u64 res = 0;
1467 int cpu;
1468
1469 for_each_possible_cpu(cpu) {
1470 void *bhptr;
1471 struct u64_stats_sync *syncp;
1472 u64 v;
1473 unsigned int start;
1474
1475 bhptr = per_cpu_ptr(mib, cpu);
1476 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1477 do {
1478 start = u64_stats_fetch_begin_irq(syncp);
1479 v = *(((u64 *) bhptr) + offt);
1480 } while (u64_stats_fetch_retry_irq(syncp, start));
1481
1482 res += v;
1483 }
1484 return res;
1485 }
1486 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1487 #endif
1488
1489 #ifdef CONFIG_IP_MULTICAST
1490 static const struct net_protocol igmp_protocol = {
1491 .handler = igmp_rcv,
1492 .netns_ok = 1,
1493 };
1494 #endif
1495
1496 static const struct net_protocol tcp_protocol = {
1497 .early_demux = tcp_v4_early_demux,
1498 .handler = tcp_v4_rcv,
1499 .err_handler = tcp_v4_err,
1500 .no_policy = 1,
1501 .netns_ok = 1,
1502 .icmp_strict_tag_validation = 1,
1503 };
1504
1505 static const struct net_protocol udp_protocol = {
1506 .early_demux = udp_v4_early_demux,
1507 .handler = udp_rcv,
1508 .err_handler = udp_err,
1509 .no_policy = 1,
1510 .netns_ok = 1,
1511 };
1512
1513 static const struct net_protocol icmp_protocol = {
1514 .handler = icmp_rcv,
1515 .err_handler = icmp_err,
1516 .no_policy = 1,
1517 .netns_ok = 1,
1518 };
1519
1520 static __net_init int ipv4_mib_init_net(struct net *net)
1521 {
1522 int i;
1523
1524 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1525 if (!net->mib.tcp_statistics)
1526 goto err_tcp_mib;
1527 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1528 if (!net->mib.ip_statistics)
1529 goto err_ip_mib;
1530
1531 for_each_possible_cpu(i) {
1532 struct ipstats_mib *af_inet_stats;
1533 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1534 u64_stats_init(&af_inet_stats->syncp);
1535 }
1536
1537 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1538 if (!net->mib.net_statistics)
1539 goto err_net_mib;
1540 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1541 if (!net->mib.udp_statistics)
1542 goto err_udp_mib;
1543 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1544 if (!net->mib.udplite_statistics)
1545 goto err_udplite_mib;
1546 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1547 if (!net->mib.icmp_statistics)
1548 goto err_icmp_mib;
1549 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1550 GFP_KERNEL);
1551 if (!net->mib.icmpmsg_statistics)
1552 goto err_icmpmsg_mib;
1553
1554 tcp_mib_init(net);
1555 return 0;
1556
1557 err_icmpmsg_mib:
1558 free_percpu(net->mib.icmp_statistics);
1559 err_icmp_mib:
1560 free_percpu(net->mib.udplite_statistics);
1561 err_udplite_mib:
1562 free_percpu(net->mib.udp_statistics);
1563 err_udp_mib:
1564 free_percpu(net->mib.net_statistics);
1565 err_net_mib:
1566 free_percpu(net->mib.ip_statistics);
1567 err_ip_mib:
1568 free_percpu(net->mib.tcp_statistics);
1569 err_tcp_mib:
1570 return -ENOMEM;
1571 }
1572
1573 static __net_exit void ipv4_mib_exit_net(struct net *net)
1574 {
1575 kfree(net->mib.icmpmsg_statistics);
1576 free_percpu(net->mib.icmp_statistics);
1577 free_percpu(net->mib.udplite_statistics);
1578 free_percpu(net->mib.udp_statistics);
1579 free_percpu(net->mib.net_statistics);
1580 free_percpu(net->mib.ip_statistics);
1581 free_percpu(net->mib.tcp_statistics);
1582 }
1583
1584 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1585 .init = ipv4_mib_init_net,
1586 .exit = ipv4_mib_exit_net,
1587 };
1588
1589 static int __init init_ipv4_mibs(void)
1590 {
1591 return register_pernet_subsys(&ipv4_mib_ops);
1592 }
1593
1594 static __net_init int inet_init_net(struct net *net)
1595 {
1596 /*
1597 * Set defaults for local port range
1598 */
1599 seqlock_init(&net->ipv4.ip_local_ports.lock);
1600 net->ipv4.ip_local_ports.range[0] = 32768;
1601 net->ipv4.ip_local_ports.range[1] = 61000;
1602
1603 seqlock_init(&net->ipv4.ping_group_range.lock);
1604 /*
1605 * Sane defaults - nobody may create ping sockets.
1606 * Boot scripts should set this to distro-specific group.
1607 */
1608 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1609 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1610 return 0;
1611 }
1612
1613 static __net_exit void inet_exit_net(struct net *net)
1614 {
1615 }
1616
1617 static __net_initdata struct pernet_operations af_inet_ops = {
1618 .init = inet_init_net,
1619 .exit = inet_exit_net,
1620 };
1621
1622 static int __init init_inet_pernet_ops(void)
1623 {
1624 return register_pernet_subsys(&af_inet_ops);
1625 }
1626
1627 static int ipv4_proc_init(void);
1628
1629 /*
1630 * IP protocol layer initialiser
1631 */
1632
1633 static struct packet_offload ip_packet_offload __read_mostly = {
1634 .type = cpu_to_be16(ETH_P_IP),
1635 .callbacks = {
1636 .gso_segment = inet_gso_segment,
1637 .gro_receive = inet_gro_receive,
1638 .gro_complete = inet_gro_complete,
1639 },
1640 };
1641
1642 static const struct net_offload ipip_offload = {
1643 .callbacks = {
1644 .gso_segment = inet_gso_segment,
1645 .gro_receive = inet_gro_receive,
1646 .gro_complete = inet_gro_complete,
1647 },
1648 };
1649
1650 static int __init ipv4_offload_init(void)
1651 {
1652 /*
1653 * Add offloads
1654 */
1655 if (udpv4_offload_init() < 0)
1656 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1657 if (tcpv4_offload_init() < 0)
1658 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1659
1660 dev_add_offload(&ip_packet_offload);
1661 inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1662 return 0;
1663 }
1664
1665 fs_initcall(ipv4_offload_init);
1666
1667 static struct packet_type ip_packet_type __read_mostly = {
1668 .type = cpu_to_be16(ETH_P_IP),
1669 .func = ip_rcv,
1670 };
1671
1672 static int __init inet_init(void)
1673 {
1674 struct inet_protosw *q;
1675 struct list_head *r;
1676 int rc = -EINVAL;
1677
1678 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
1679
1680 rc = proto_register(&tcp_prot, 1);
1681 if (rc)
1682 goto out;
1683
1684 rc = proto_register(&udp_prot, 1);
1685 if (rc)
1686 goto out_unregister_tcp_proto;
1687
1688 rc = proto_register(&raw_prot, 1);
1689 if (rc)
1690 goto out_unregister_udp_proto;
1691
1692 rc = proto_register(&ping_prot, 1);
1693 if (rc)
1694 goto out_unregister_raw_proto;
1695
1696 /*
1697 * Tell SOCKET that we are alive...
1698 */
1699
1700 (void)sock_register(&inet_family_ops);
1701
1702 #ifdef CONFIG_SYSCTL
1703 ip_static_sysctl_init();
1704 #endif
1705
1706 /*
1707 * Add all the base protocols.
1708 */
1709
1710 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1711 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1712 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1713 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1714 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1715 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1716 #ifdef CONFIG_IP_MULTICAST
1717 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1718 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1719 #endif
1720
1721 /* Register the socket-side information for inet_create. */
1722 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1723 INIT_LIST_HEAD(r);
1724
1725 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1726 inet_register_protosw(q);
1727
1728 /*
1729 * Set the ARP module up
1730 */
1731
1732 arp_init();
1733
1734 /*
1735 * Set the IP module up
1736 */
1737
1738 ip_init();
1739
1740 tcp_v4_init();
1741
1742 /* Setup TCP slab cache for open requests. */
1743 tcp_init();
1744
1745 /* Setup UDP memory threshold */
1746 udp_init();
1747
1748 /* Add UDP-Lite (RFC 3828) */
1749 udplite4_register();
1750
1751 ping_init();
1752
1753 /*
1754 * Set the ICMP layer up
1755 */
1756
1757 if (icmp_init() < 0)
1758 panic("Failed to create the ICMP control socket.\n");
1759
1760 /*
1761 * Initialise the multicast router
1762 */
1763 #if defined(CONFIG_IP_MROUTE)
1764 if (ip_mr_init())
1765 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1766 #endif
1767
1768 if (init_inet_pernet_ops())
1769 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
1770 /*
1771 * Initialise per-cpu ipv4 mibs
1772 */
1773
1774 if (init_ipv4_mibs())
1775 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1776
1777 ipv4_proc_init();
1778
1779 ipfrag_init();
1780
1781 dev_add_pack(&ip_packet_type);
1782
1783 rc = 0;
1784 out:
1785 return rc;
1786 out_unregister_raw_proto:
1787 proto_unregister(&raw_prot);
1788 out_unregister_udp_proto:
1789 proto_unregister(&udp_prot);
1790 out_unregister_tcp_proto:
1791 proto_unregister(&tcp_prot);
1792 goto out;
1793 }
1794
1795 fs_initcall(inet_init);
1796
1797 /* ------------------------------------------------------------------------ */
1798
1799 #ifdef CONFIG_PROC_FS
1800 static int __init ipv4_proc_init(void)
1801 {
1802 int rc = 0;
1803
1804 if (raw_proc_init())
1805 goto out_raw;
1806 if (tcp4_proc_init())
1807 goto out_tcp;
1808 if (udp4_proc_init())
1809 goto out_udp;
1810 if (ping_proc_init())
1811 goto out_ping;
1812 if (ip_misc_proc_init())
1813 goto out_misc;
1814 out:
1815 return rc;
1816 out_misc:
1817 ping_proc_exit();
1818 out_ping:
1819 udp4_proc_exit();
1820 out_udp:
1821 tcp4_proc_exit();
1822 out_tcp:
1823 raw_proc_exit();
1824 out_raw:
1825 rc = -ENOMEM;
1826 goto out;
1827 }
1828
1829 #else /* CONFIG_PROC_FS */
1830 static int __init ipv4_proc_init(void)
1831 {
1832 return 0;
1833 }
1834 #endif /* CONFIG_PROC_FS */
1835
1836 MODULE_ALIAS_NETPROTO(PF_INET);
1837
Linux kernel - Deliverables
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