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i40e: Add missing braces to i40e_dcb_need_reconfig()
[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 char answer_no_check;
258 int try_loading_module = 0;
259 int err;
260
261 sock->state = SS_UNCONNECTED;
262
263 /* Look for the requested type/protocol pair. */
264 lookup_protocol:
265 err = -ESOCKTNOSUPPORT;
266 rcu_read_lock();
267 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
268
269 err = 0;
270 /* Check the non-wild match. */
271 if (protocol == answer->protocol) {
272 if (protocol != IPPROTO_IP)
273 break;
274 } else {
275 /* Check for the two wild cases. */
276 if (IPPROTO_IP == protocol) {
277 protocol = answer->protocol;
278 break;
279 }
280 if (IPPROTO_IP == answer->protocol)
281 break;
282 }
283 err = -EPROTONOSUPPORT;
284 }
285
286 if (unlikely(err)) {
287 if (try_loading_module < 2) {
288 rcu_read_unlock();
289 /*
290 * Be more specific, e.g. net-pf-2-proto-132-type-1
291 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
292 */
293 if (++try_loading_module == 1)
294 request_module("net-pf-%d-proto-%d-type-%d",
295 PF_INET, protocol, sock->type);
296 /*
297 * Fall back to generic, e.g. net-pf-2-proto-132
298 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
299 */
300 else
301 request_module("net-pf-%d-proto-%d",
302 PF_INET, protocol);
303 goto lookup_protocol;
304 } else
305 goto out_rcu_unlock;
306 }
307
308 err = -EPERM;
309 if (sock->type == SOCK_RAW && !kern &&
310 !ns_capable(net->user_ns, CAP_NET_RAW))
311 goto out_rcu_unlock;
312
313 sock->ops = answer->ops;
314 answer_prot = answer->prot;
315 answer_no_check = answer->no_check;
316 answer_flags = answer->flags;
317 rcu_read_unlock();
318
319 WARN_ON(answer_prot->slab == NULL);
320
321 err = -ENOBUFS;
322 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
323 if (sk == NULL)
324 goto out;
325
326 err = 0;
327 sk->sk_no_check = answer_no_check;
328 if (INET_PROTOSW_REUSE & answer_flags)
329 sk->sk_reuse = SK_CAN_REUSE;
330
331 inet = inet_sk(sk);
332 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
333
334 inet->nodefrag = 0;
335
336 if (SOCK_RAW == sock->type) {
337 inet->inet_num = protocol;
338 if (IPPROTO_RAW == protocol)
339 inet->hdrincl = 1;
340 }
341
342 if (net->ipv4.sysctl_ip_no_pmtu_disc)
343 inet->pmtudisc = IP_PMTUDISC_DONT;
344 else
345 inet->pmtudisc = IP_PMTUDISC_WANT;
346
347 inet->inet_id = 0;
348
349 sock_init_data(sock, sk);
350
351 sk->sk_destruct = inet_sock_destruct;
352 sk->sk_protocol = protocol;
353 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
354
355 inet->uc_ttl = -1;
356 inet->mc_loop = 1;
357 inet->mc_ttl = 1;
358 inet->mc_all = 1;
359 inet->mc_index = 0;
360 inet->mc_list = NULL;
361 inet->rcv_tos = 0;
362
363 sk_refcnt_debug_inc(sk);
364
365 if (inet->inet_num) {
366 /* It assumes that any protocol which allows
367 * the user to assign a number at socket
368 * creation time automatically
369 * shares.
370 */
371 inet->inet_sport = htons(inet->inet_num);
372 /* Add to protocol hash chains. */
373 sk->sk_prot->hash(sk);
374 }
375
376 if (sk->sk_prot->init) {
377 err = sk->sk_prot->init(sk);
378 if (err)
379 sk_common_release(sk);
380 }
381 out:
382 return err;
383 out_rcu_unlock:
384 rcu_read_unlock();
385 goto out;
386 }
387
388
389 /*
390 * The peer socket should always be NULL (or else). When we call this
391 * function we are destroying the object and from then on nobody
392 * should refer to it.
393 */
394 int inet_release(struct socket *sock)
395 {
396 struct sock *sk = sock->sk;
397
398 if (sk) {
399 long timeout;
400
401 sock_rps_reset_flow(sk);
402
403 /* Applications forget to leave groups before exiting */
404 ip_mc_drop_socket(sk);
405
406 /* If linger is set, we don't return until the close
407 * is complete. Otherwise we return immediately. The
408 * actually closing is done the same either way.
409 *
410 * If the close is due to the process exiting, we never
411 * linger..
412 */
413 timeout = 0;
414 if (sock_flag(sk, SOCK_LINGER) &&
415 !(current->flags & PF_EXITING))
416 timeout = sk->sk_lingertime;
417 sock->sk = NULL;
418 sk->sk_prot->close(sk, timeout);
419 }
420 return 0;
421 }
422 EXPORT_SYMBOL(inet_release);
423
424 /* It is off by default, see below. */
425 int sysctl_ip_nonlocal_bind __read_mostly;
426 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
427
428 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
429 {
430 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
431 struct sock *sk = sock->sk;
432 struct inet_sock *inet = inet_sk(sk);
433 struct net *net = sock_net(sk);
434 unsigned short snum;
435 int chk_addr_ret;
436 int err;
437
438 /* If the socket has its own bind function then use it. (RAW) */
439 if (sk->sk_prot->bind) {
440 err = sk->sk_prot->bind(sk, uaddr, addr_len);
441 goto out;
442 }
443 err = -EINVAL;
444 if (addr_len < sizeof(struct sockaddr_in))
445 goto out;
446
447 if (addr->sin_family != AF_INET) {
448 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
449 * only if s_addr is INADDR_ANY.
450 */
451 err = -EAFNOSUPPORT;
452 if (addr->sin_family != AF_UNSPEC ||
453 addr->sin_addr.s_addr != htonl(INADDR_ANY))
454 goto out;
455 }
456
457 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
458
459 /* Not specified by any standard per-se, however it breaks too
460 * many applications when removed. It is unfortunate since
461 * allowing applications to make a non-local bind solves
462 * several problems with systems using dynamic addressing.
463 * (ie. your servers still start up even if your ISDN link
464 * is temporarily down)
465 */
466 err = -EADDRNOTAVAIL;
467 if (!sysctl_ip_nonlocal_bind &&
468 !(inet->freebind || inet->transparent) &&
469 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
470 chk_addr_ret != RTN_LOCAL &&
471 chk_addr_ret != RTN_MULTICAST &&
472 chk_addr_ret != RTN_BROADCAST)
473 goto out;
474
475 snum = ntohs(addr->sin_port);
476 err = -EACCES;
477 if (snum && snum < PROT_SOCK &&
478 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
479 goto out;
480
481 /* We keep a pair of addresses. rcv_saddr is the one
482 * used by hash lookups, and saddr is used for transmit.
483 *
484 * In the BSD API these are the same except where it
485 * would be illegal to use them (multicast/broadcast) in
486 * which case the sending device address is used.
487 */
488 lock_sock(sk);
489
490 /* Check these errors (active socket, double bind). */
491 err = -EINVAL;
492 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
493 goto out_release_sock;
494
495 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
496 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
497 inet->inet_saddr = 0; /* Use device */
498
499 /* Make sure we are allowed to bind here. */
500 if (sk->sk_prot->get_port(sk, snum)) {
501 inet->inet_saddr = inet->inet_rcv_saddr = 0;
502 err = -EADDRINUSE;
503 goto out_release_sock;
504 }
505
506 if (inet->inet_rcv_saddr)
507 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
508 if (snum)
509 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
510 inet->inet_sport = htons(inet->inet_num);
511 inet->inet_daddr = 0;
512 inet->inet_dport = 0;
513 sk_dst_reset(sk);
514 err = 0;
515 out_release_sock:
516 release_sock(sk);
517 out:
518 return err;
519 }
520 EXPORT_SYMBOL(inet_bind);
521
522 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
523 int addr_len, int flags)
524 {
525 struct sock *sk = sock->sk;
526
527 if (addr_len < sizeof(uaddr->sa_family))
528 return -EINVAL;
529 if (uaddr->sa_family == AF_UNSPEC)
530 return sk->sk_prot->disconnect(sk, flags);
531
532 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
533 return -EAGAIN;
534 return sk->sk_prot->connect(sk, uaddr, addr_len);
535 }
536 EXPORT_SYMBOL(inet_dgram_connect);
537
538 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
539 {
540 DEFINE_WAIT(wait);
541
542 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
543 sk->sk_write_pending += writebias;
544
545 /* Basic assumption: if someone sets sk->sk_err, he _must_
546 * change state of the socket from TCP_SYN_*.
547 * Connect() does not allow to get error notifications
548 * without closing the socket.
549 */
550 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
551 release_sock(sk);
552 timeo = schedule_timeout(timeo);
553 lock_sock(sk);
554 if (signal_pending(current) || !timeo)
555 break;
556 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
557 }
558 finish_wait(sk_sleep(sk), &wait);
559 sk->sk_write_pending -= writebias;
560 return timeo;
561 }
562
563 /*
564 * Connect to a remote host. There is regrettably still a little
565 * TCP 'magic' in here.
566 */
567 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
568 int addr_len, int flags)
569 {
570 struct sock *sk = sock->sk;
571 int err;
572 long timeo;
573
574 if (addr_len < sizeof(uaddr->sa_family))
575 return -EINVAL;
576
577 if (uaddr->sa_family == AF_UNSPEC) {
578 err = sk->sk_prot->disconnect(sk, flags);
579 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
580 goto out;
581 }
582
583 switch (sock->state) {
584 default:
585 err = -EINVAL;
586 goto out;
587 case SS_CONNECTED:
588 err = -EISCONN;
589 goto out;
590 case SS_CONNECTING:
591 err = -EALREADY;
592 /* Fall out of switch with err, set for this state */
593 break;
594 case SS_UNCONNECTED:
595 err = -EISCONN;
596 if (sk->sk_state != TCP_CLOSE)
597 goto out;
598
599 err = sk->sk_prot->connect(sk, uaddr, addr_len);
600 if (err < 0)
601 goto out;
602
603 sock->state = SS_CONNECTING;
604
605 /* Just entered SS_CONNECTING state; the only
606 * difference is that return value in non-blocking
607 * case is EINPROGRESS, rather than EALREADY.
608 */
609 err = -EINPROGRESS;
610 break;
611 }
612
613 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
614
615 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
616 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
617 tcp_sk(sk)->fastopen_req &&
618 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
619
620 /* Error code is set above */
621 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
622 goto out;
623
624 err = sock_intr_errno(timeo);
625 if (signal_pending(current))
626 goto out;
627 }
628
629 /* Connection was closed by RST, timeout, ICMP error
630 * or another process disconnected us.
631 */
632 if (sk->sk_state == TCP_CLOSE)
633 goto sock_error;
634
635 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
636 * and error was received after socket entered established state.
637 * Hence, it is handled normally after connect() return successfully.
638 */
639
640 sock->state = SS_CONNECTED;
641 err = 0;
642 out:
643 return err;
644
645 sock_error:
646 err = sock_error(sk) ? : -ECONNABORTED;
647 sock->state = SS_UNCONNECTED;
648 if (sk->sk_prot->disconnect(sk, flags))
649 sock->state = SS_DISCONNECTING;
650 goto out;
651 }
652 EXPORT_SYMBOL(__inet_stream_connect);
653
654 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
655 int addr_len, int flags)
656 {
657 int err;
658
659 lock_sock(sock->sk);
660 err = __inet_stream_connect(sock, uaddr, addr_len, flags);
661 release_sock(sock->sk);
662 return err;
663 }
664 EXPORT_SYMBOL(inet_stream_connect);
665
666 /*
667 * Accept a pending connection. The TCP layer now gives BSD semantics.
668 */
669
670 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
671 {
672 struct sock *sk1 = sock->sk;
673 int err = -EINVAL;
674 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
675
676 if (!sk2)
677 goto do_err;
678
679 lock_sock(sk2);
680
681 sock_rps_record_flow(sk2);
682 WARN_ON(!((1 << sk2->sk_state) &
683 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
684 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
685
686 sock_graft(sk2, newsock);
687
688 newsock->state = SS_CONNECTED;
689 err = 0;
690 release_sock(sk2);
691 do_err:
692 return err;
693 }
694 EXPORT_SYMBOL(inet_accept);
695
696
697 /*
698 * This does both peername and sockname.
699 */
700 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
701 int *uaddr_len, int peer)
702 {
703 struct sock *sk = sock->sk;
704 struct inet_sock *inet = inet_sk(sk);
705 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
706
707 sin->sin_family = AF_INET;
708 if (peer) {
709 if (!inet->inet_dport ||
710 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
711 peer == 1))
712 return -ENOTCONN;
713 sin->sin_port = inet->inet_dport;
714 sin->sin_addr.s_addr = inet->inet_daddr;
715 } else {
716 __be32 addr = inet->inet_rcv_saddr;
717 if (!addr)
718 addr = inet->inet_saddr;
719 sin->sin_port = inet->inet_sport;
720 sin->sin_addr.s_addr = addr;
721 }
722 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
723 *uaddr_len = sizeof(*sin);
724 return 0;
725 }
726 EXPORT_SYMBOL(inet_getname);
727
728 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
729 size_t size)
730 {
731 struct sock *sk = sock->sk;
732
733 sock_rps_record_flow(sk);
734
735 /* We may need to bind the socket. */
736 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
737 inet_autobind(sk))
738 return -EAGAIN;
739
740 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
741 }
742 EXPORT_SYMBOL(inet_sendmsg);
743
744 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
745 size_t size, int flags)
746 {
747 struct sock *sk = sock->sk;
748
749 sock_rps_record_flow(sk);
750
751 /* We may need to bind the socket. */
752 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
753 inet_autobind(sk))
754 return -EAGAIN;
755
756 if (sk->sk_prot->sendpage)
757 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
758 return sock_no_sendpage(sock, page, offset, size, flags);
759 }
760 EXPORT_SYMBOL(inet_sendpage);
761
762 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
763 size_t size, int flags)
764 {
765 struct sock *sk = sock->sk;
766 int addr_len = 0;
767 int err;
768
769 sock_rps_record_flow(sk);
770
771 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
772 flags & ~MSG_DONTWAIT, &addr_len);
773 if (err >= 0)
774 msg->msg_namelen = addr_len;
775 return err;
776 }
777 EXPORT_SYMBOL(inet_recvmsg);
778
779 int inet_shutdown(struct socket *sock, int how)
780 {
781 struct sock *sk = sock->sk;
782 int err = 0;
783
784 /* This should really check to make sure
785 * the socket is a TCP socket. (WHY AC...)
786 */
787 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
788 1->2 bit 2 snds.
789 2->3 */
790 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
791 return -EINVAL;
792
793 lock_sock(sk);
794 if (sock->state == SS_CONNECTING) {
795 if ((1 << sk->sk_state) &
796 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
797 sock->state = SS_DISCONNECTING;
798 else
799 sock->state = SS_CONNECTED;
800 }
801
802 switch (sk->sk_state) {
803 case TCP_CLOSE:
804 err = -ENOTCONN;
805 /* Hack to wake up other listeners, who can poll for
806 POLLHUP, even on eg. unconnected UDP sockets -- RR */
807 default:
808 sk->sk_shutdown |= how;
809 if (sk->sk_prot->shutdown)
810 sk->sk_prot->shutdown(sk, how);
811 break;
812
813 /* Remaining two branches are temporary solution for missing
814 * close() in multithreaded environment. It is _not_ a good idea,
815 * but we have no choice until close() is repaired at VFS level.
816 */
817 case TCP_LISTEN:
818 if (!(how & RCV_SHUTDOWN))
819 break;
820 /* Fall through */
821 case TCP_SYN_SENT:
822 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
823 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
824 break;
825 }
826
827 /* Wake up anyone sleeping in poll. */
828 sk->sk_state_change(sk);
829 release_sock(sk);
830 return err;
831 }
832 EXPORT_SYMBOL(inet_shutdown);
833
834 /*
835 * ioctl() calls you can issue on an INET socket. Most of these are
836 * device configuration and stuff and very rarely used. Some ioctls
837 * pass on to the socket itself.
838 *
839 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
840 * loads the devconfigure module does its configuring and unloads it.
841 * There's a good 20K of config code hanging around the kernel.
842 */
843
844 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
845 {
846 struct sock *sk = sock->sk;
847 int err = 0;
848 struct net *net = sock_net(sk);
849
850 switch (cmd) {
851 case SIOCGSTAMP:
852 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
853 break;
854 case SIOCGSTAMPNS:
855 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
856 break;
857 case SIOCADDRT:
858 case SIOCDELRT:
859 case SIOCRTMSG:
860 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
861 break;
862 case SIOCDARP:
863 case SIOCGARP:
864 case SIOCSARP:
865 err = arp_ioctl(net, cmd, (void __user *)arg);
866 break;
867 case SIOCGIFADDR:
868 case SIOCSIFADDR:
869 case SIOCGIFBRDADDR:
870 case SIOCSIFBRDADDR:
871 case SIOCGIFNETMASK:
872 case SIOCSIFNETMASK:
873 case SIOCGIFDSTADDR:
874 case SIOCSIFDSTADDR:
875 case SIOCSIFPFLAGS:
876 case SIOCGIFPFLAGS:
877 case SIOCSIFFLAGS:
878 err = devinet_ioctl(net, cmd, (void __user *)arg);
879 break;
880 default:
881 if (sk->sk_prot->ioctl)
882 err = sk->sk_prot->ioctl(sk, cmd, arg);
883 else
884 err = -ENOIOCTLCMD;
885 break;
886 }
887 return err;
888 }
889 EXPORT_SYMBOL(inet_ioctl);
890
891 #ifdef CONFIG_COMPAT
892 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
893 {
894 struct sock *sk = sock->sk;
895 int err = -ENOIOCTLCMD;
896
897 if (sk->sk_prot->compat_ioctl)
898 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
899
900 return err;
901 }
902 #endif
903
904 const struct proto_ops inet_stream_ops = {
905 .family = PF_INET,
906 .owner = THIS_MODULE,
907 .release = inet_release,
908 .bind = inet_bind,
909 .connect = inet_stream_connect,
910 .socketpair = sock_no_socketpair,
911 .accept = inet_accept,
912 .getname = inet_getname,
913 .poll = tcp_poll,
914 .ioctl = inet_ioctl,
915 .listen = inet_listen,
916 .shutdown = inet_shutdown,
917 .setsockopt = sock_common_setsockopt,
918 .getsockopt = sock_common_getsockopt,
919 .sendmsg = inet_sendmsg,
920 .recvmsg = inet_recvmsg,
921 .mmap = sock_no_mmap,
922 .sendpage = inet_sendpage,
923 .splice_read = tcp_splice_read,
924 #ifdef CONFIG_COMPAT
925 .compat_setsockopt = compat_sock_common_setsockopt,
926 .compat_getsockopt = compat_sock_common_getsockopt,
927 .compat_ioctl = inet_compat_ioctl,
928 #endif
929 };
930 EXPORT_SYMBOL(inet_stream_ops);
931
932 const struct proto_ops inet_dgram_ops = {
933 .family = PF_INET,
934 .owner = THIS_MODULE,
935 .release = inet_release,
936 .bind = inet_bind,
937 .connect = inet_dgram_connect,
938 .socketpair = sock_no_socketpair,
939 .accept = sock_no_accept,
940 .getname = inet_getname,
941 .poll = udp_poll,
942 .ioctl = inet_ioctl,
943 .listen = sock_no_listen,
944 .shutdown = inet_shutdown,
945 .setsockopt = sock_common_setsockopt,
946 .getsockopt = sock_common_getsockopt,
947 .sendmsg = inet_sendmsg,
948 .recvmsg = inet_recvmsg,
949 .mmap = sock_no_mmap,
950 .sendpage = inet_sendpage,
951 #ifdef CONFIG_COMPAT
952 .compat_setsockopt = compat_sock_common_setsockopt,
953 .compat_getsockopt = compat_sock_common_getsockopt,
954 .compat_ioctl = inet_compat_ioctl,
955 #endif
956 };
957 EXPORT_SYMBOL(inet_dgram_ops);
958
959 /*
960 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
961 * udp_poll
962 */
963 static const struct proto_ops inet_sockraw_ops = {
964 .family = PF_INET,
965 .owner = THIS_MODULE,
966 .release = inet_release,
967 .bind = inet_bind,
968 .connect = inet_dgram_connect,
969 .socketpair = sock_no_socketpair,
970 .accept = sock_no_accept,
971 .getname = inet_getname,
972 .poll = datagram_poll,
973 .ioctl = inet_ioctl,
974 .listen = sock_no_listen,
975 .shutdown = inet_shutdown,
976 .setsockopt = sock_common_setsockopt,
977 .getsockopt = sock_common_getsockopt,
978 .sendmsg = inet_sendmsg,
979 .recvmsg = inet_recvmsg,
980 .mmap = sock_no_mmap,
981 .sendpage = inet_sendpage,
982 #ifdef CONFIG_COMPAT
983 .compat_setsockopt = compat_sock_common_setsockopt,
984 .compat_getsockopt = compat_sock_common_getsockopt,
985 .compat_ioctl = inet_compat_ioctl,
986 #endif
987 };
988
989 static const struct net_proto_family inet_family_ops = {
990 .family = PF_INET,
991 .create = inet_create,
992 .owner = THIS_MODULE,
993 };
994
995 /* Upon startup we insert all the elements in inetsw_array[] into
996 * the linked list inetsw.
997 */
998 static struct inet_protosw inetsw_array[] =
999 {
1000 {
1001 .type = SOCK_STREAM,
1002 .protocol = IPPROTO_TCP,
1003 .prot = &tcp_prot,
1004 .ops = &inet_stream_ops,
1005 .no_check = 0,
1006 .flags = INET_PROTOSW_PERMANENT |
1007 INET_PROTOSW_ICSK,
1008 },
1009
1010 {
1011 .type = SOCK_DGRAM,
1012 .protocol = IPPROTO_UDP,
1013 .prot = &udp_prot,
1014 .ops = &inet_dgram_ops,
1015 .no_check = UDP_CSUM_DEFAULT,
1016 .flags = INET_PROTOSW_PERMANENT,
1017 },
1018
1019 {
1020 .type = SOCK_DGRAM,
1021 .protocol = IPPROTO_ICMP,
1022 .prot = &ping_prot,
1023 .ops = &inet_dgram_ops,
1024 .no_check = UDP_CSUM_DEFAULT,
1025 .flags = INET_PROTOSW_REUSE,
1026 },
1027
1028 {
1029 .type = SOCK_RAW,
1030 .protocol = IPPROTO_IP, /* wild card */
1031 .prot = &raw_prot,
1032 .ops = &inet_sockraw_ops,
1033 .no_check = UDP_CSUM_DEFAULT,
1034 .flags = INET_PROTOSW_REUSE,
1035 }
1036 };
1037
1038 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1039
1040 void inet_register_protosw(struct inet_protosw *p)
1041 {
1042 struct list_head *lh;
1043 struct inet_protosw *answer;
1044 int protocol = p->protocol;
1045 struct list_head *last_perm;
1046
1047 spin_lock_bh(&inetsw_lock);
1048
1049 if (p->type >= SOCK_MAX)
1050 goto out_illegal;
1051
1052 /* If we are trying to override a permanent protocol, bail. */
1053 answer = NULL;
1054 last_perm = &inetsw[p->type];
1055 list_for_each(lh, &inetsw[p->type]) {
1056 answer = list_entry(lh, struct inet_protosw, list);
1057
1058 /* Check only the non-wild match. */
1059 if (INET_PROTOSW_PERMANENT & answer->flags) {
1060 if (protocol == answer->protocol)
1061 break;
1062 last_perm = lh;
1063 }
1064
1065 answer = NULL;
1066 }
1067 if (answer)
1068 goto out_permanent;
1069
1070 /* Add the new entry after the last permanent entry if any, so that
1071 * the new entry does not override a permanent entry when matched with
1072 * a wild-card protocol. But it is allowed to override any existing
1073 * non-permanent entry. This means that when we remove this entry, the
1074 * system automatically returns to the old behavior.
1075 */
1076 list_add_rcu(&p->list, last_perm);
1077 out:
1078 spin_unlock_bh(&inetsw_lock);
1079
1080 return;
1081
1082 out_permanent:
1083 pr_err("Attempt to override permanent protocol %d\n", protocol);
1084 goto out;
1085
1086 out_illegal:
1087 pr_err("Ignoring attempt to register invalid socket type %d\n",
1088 p->type);
1089 goto out;
1090 }
1091 EXPORT_SYMBOL(inet_register_protosw);
1092
1093 void inet_unregister_protosw(struct inet_protosw *p)
1094 {
1095 if (INET_PROTOSW_PERMANENT & p->flags) {
1096 pr_err("Attempt to unregister permanent protocol %d\n",
1097 p->protocol);
1098 } else {
1099 spin_lock_bh(&inetsw_lock);
1100 list_del_rcu(&p->list);
1101 spin_unlock_bh(&inetsw_lock);
1102
1103 synchronize_net();
1104 }
1105 }
1106 EXPORT_SYMBOL(inet_unregister_protosw);
1107
1108 /*
1109 * Shall we try to damage output packets if routing dev changes?
1110 */
1111
1112 int sysctl_ip_dynaddr __read_mostly;
1113
1114 static int inet_sk_reselect_saddr(struct sock *sk)
1115 {
1116 struct inet_sock *inet = inet_sk(sk);
1117 __be32 old_saddr = inet->inet_saddr;
1118 __be32 daddr = inet->inet_daddr;
1119 struct flowi4 *fl4;
1120 struct rtable *rt;
1121 __be32 new_saddr;
1122 struct ip_options_rcu *inet_opt;
1123
1124 inet_opt = rcu_dereference_protected(inet->inet_opt,
1125 sock_owned_by_user(sk));
1126 if (inet_opt && inet_opt->opt.srr)
1127 daddr = inet_opt->opt.faddr;
1128
1129 /* Query new route. */
1130 fl4 = &inet->cork.fl.u.ip4;
1131 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1132 sk->sk_bound_dev_if, sk->sk_protocol,
1133 inet->inet_sport, inet->inet_dport, sk);
1134 if (IS_ERR(rt))
1135 return PTR_ERR(rt);
1136
1137 sk_setup_caps(sk, &rt->dst);
1138
1139 new_saddr = fl4->saddr;
1140
1141 if (new_saddr == old_saddr)
1142 return 0;
1143
1144 if (sysctl_ip_dynaddr > 1) {
1145 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1146 __func__, &old_saddr, &new_saddr);
1147 }
1148
1149 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1150
1151 /*
1152 * XXX The only one ugly spot where we need to
1153 * XXX really change the sockets identity after
1154 * XXX it has entered the hashes. -DaveM
1155 *
1156 * Besides that, it does not check for connection
1157 * uniqueness. Wait for troubles.
1158 */
1159 __sk_prot_rehash(sk);
1160 return 0;
1161 }
1162
1163 int inet_sk_rebuild_header(struct sock *sk)
1164 {
1165 struct inet_sock *inet = inet_sk(sk);
1166 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1167 __be32 daddr;
1168 struct ip_options_rcu *inet_opt;
1169 struct flowi4 *fl4;
1170 int err;
1171
1172 /* Route is OK, nothing to do. */
1173 if (rt)
1174 return 0;
1175
1176 /* Reroute. */
1177 rcu_read_lock();
1178 inet_opt = rcu_dereference(inet->inet_opt);
1179 daddr = inet->inet_daddr;
1180 if (inet_opt && inet_opt->opt.srr)
1181 daddr = inet_opt->opt.faddr;
1182 rcu_read_unlock();
1183 fl4 = &inet->cork.fl.u.ip4;
1184 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1185 inet->inet_dport, inet->inet_sport,
1186 sk->sk_protocol, RT_CONN_FLAGS(sk),
1187 sk->sk_bound_dev_if);
1188 if (!IS_ERR(rt)) {
1189 err = 0;
1190 sk_setup_caps(sk, &rt->dst);
1191 } else {
1192 err = PTR_ERR(rt);
1193
1194 /* Routing failed... */
1195 sk->sk_route_caps = 0;
1196 /*
1197 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1198 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1199 */
1200 if (!sysctl_ip_dynaddr ||
1201 sk->sk_state != TCP_SYN_SENT ||
1202 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1203 (err = inet_sk_reselect_saddr(sk)) != 0)
1204 sk->sk_err_soft = -err;
1205 }
1206
1207 return err;
1208 }
1209 EXPORT_SYMBOL(inet_sk_rebuild_header);
1210
1211 static int inet_gso_send_check(struct sk_buff *skb)
1212 {
1213 const struct net_offload *ops;
1214 const struct iphdr *iph;
1215 int proto;
1216 int ihl;
1217 int err = -EINVAL;
1218
1219 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1220 goto out;
1221
1222 iph = ip_hdr(skb);
1223 ihl = iph->ihl * 4;
1224 if (ihl < sizeof(*iph))
1225 goto out;
1226
1227 proto = iph->protocol;
1228
1229 /* Warning: after this point, iph might be no longer valid */
1230 if (unlikely(!pskb_may_pull(skb, ihl)))
1231 goto out;
1232 __skb_pull(skb, ihl);
1233
1234 skb_reset_transport_header(skb);
1235 err = -EPROTONOSUPPORT;
1236
1237 ops = rcu_dereference(inet_offloads[proto]);
1238 if (likely(ops && ops->callbacks.gso_send_check))
1239 err = ops->callbacks.gso_send_check(skb);
1240
1241 out:
1242 return err;
1243 }
1244
1245 static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1246 netdev_features_t features)
1247 {
1248 struct sk_buff *segs = ERR_PTR(-EINVAL);
1249 const struct net_offload *ops;
1250 unsigned int offset = 0;
1251 bool udpfrag, encap;
1252 struct iphdr *iph;
1253 int proto;
1254 int nhoff;
1255 int ihl;
1256 int id;
1257
1258 if (unlikely(skb_shinfo(skb)->gso_type &
1259 ~(SKB_GSO_TCPV4 |
1260 SKB_GSO_UDP |
1261 SKB_GSO_DODGY |
1262 SKB_GSO_TCP_ECN |
1263 SKB_GSO_GRE |
1264 SKB_GSO_IPIP |
1265 SKB_GSO_SIT |
1266 SKB_GSO_TCPV6 |
1267 SKB_GSO_UDP_TUNNEL |
1268 SKB_GSO_MPLS |
1269 0)))
1270 goto out;
1271
1272 skb_reset_network_header(skb);
1273 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1274 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1275 goto out;
1276
1277 iph = ip_hdr(skb);
1278 ihl = iph->ihl * 4;
1279 if (ihl < sizeof(*iph))
1280 goto out;
1281
1282 id = ntohs(iph->id);
1283 proto = iph->protocol;
1284
1285 /* Warning: after this point, iph might be no longer valid */
1286 if (unlikely(!pskb_may_pull(skb, ihl)))
1287 goto out;
1288 __skb_pull(skb, ihl);
1289
1290 encap = SKB_GSO_CB(skb)->encap_level > 0;
1291 if (encap)
1292 features = skb->dev->hw_enc_features & netif_skb_features(skb);
1293 SKB_GSO_CB(skb)->encap_level += ihl;
1294
1295 skb_reset_transport_header(skb);
1296
1297 segs = ERR_PTR(-EPROTONOSUPPORT);
1298
1299 /* Note : following gso_segment() might change skb->encapsulation */
1300 udpfrag = !skb->encapsulation && proto == IPPROTO_UDP;
1301
1302 ops = rcu_dereference(inet_offloads[proto]);
1303 if (likely(ops && ops->callbacks.gso_segment))
1304 segs = ops->callbacks.gso_segment(skb, features);
1305
1306 if (IS_ERR_OR_NULL(segs))
1307 goto out;
1308
1309 skb = segs;
1310 do {
1311 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1312 if (udpfrag) {
1313 iph->id = htons(id);
1314 iph->frag_off = htons(offset >> 3);
1315 if (skb->next != NULL)
1316 iph->frag_off |= htons(IP_MF);
1317 offset += skb->len - nhoff - ihl;
1318 } else {
1319 iph->id = htons(id++);
1320 }
1321 iph->tot_len = htons(skb->len - nhoff);
1322 ip_send_check(iph);
1323 if (encap)
1324 skb_reset_inner_headers(skb);
1325 skb->network_header = (u8 *)iph - skb->head;
1326 } while ((skb = skb->next));
1327
1328 out:
1329 return segs;
1330 }
1331
1332 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1333 struct sk_buff *skb)
1334 {
1335 const struct net_offload *ops;
1336 struct sk_buff **pp = NULL;
1337 struct sk_buff *p;
1338 const struct iphdr *iph;
1339 unsigned int hlen;
1340 unsigned int off;
1341 unsigned int id;
1342 int flush = 1;
1343 int proto;
1344
1345 off = skb_gro_offset(skb);
1346 hlen = off + sizeof(*iph);
1347 iph = skb_gro_header_fast(skb, off);
1348 if (skb_gro_header_hard(skb, hlen)) {
1349 iph = skb_gro_header_slow(skb, hlen, off);
1350 if (unlikely(!iph))
1351 goto out;
1352 }
1353
1354 proto = iph->protocol;
1355
1356 rcu_read_lock();
1357 ops = rcu_dereference(inet_offloads[proto]);
1358 if (!ops || !ops->callbacks.gro_receive)
1359 goto out_unlock;
1360
1361 if (*(u8 *)iph != 0x45)
1362 goto out_unlock;
1363
1364 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1365 goto out_unlock;
1366
1367 id = ntohl(*(__be32 *)&iph->id);
1368 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1369 id >>= 16;
1370
1371 for (p = *head; p; p = p->next) {
1372 struct iphdr *iph2;
1373
1374 if (!NAPI_GRO_CB(p)->same_flow)
1375 continue;
1376
1377 iph2 = (struct iphdr *)(p->data + off);
1378 /* The above works because, with the exception of the top
1379 * (inner most) layer, we only aggregate pkts with the same
1380 * hdr length so all the hdrs we'll need to verify will start
1381 * at the same offset.
1382 */
1383 if ((iph->protocol ^ iph2->protocol) |
1384 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1385 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1386 NAPI_GRO_CB(p)->same_flow = 0;
1387 continue;
1388 }
1389
1390 /* All fields must match except length and checksum. */
1391 NAPI_GRO_CB(p)->flush |=
1392 (iph->ttl ^ iph2->ttl) |
1393 (iph->tos ^ iph2->tos) |
1394 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1395
1396 /* Save the IP ID check to be included later when we get to
1397 * the transport layer so only the inner most IP ID is checked.
1398 * This is because some GSO/TSO implementations do not
1399 * correctly increment the IP ID for the outer hdrs.
1400 */
1401 NAPI_GRO_CB(p)->flush_id =
1402 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1403 NAPI_GRO_CB(p)->flush |= flush;
1404 }
1405
1406 NAPI_GRO_CB(skb)->flush |= flush;
1407 skb_set_network_header(skb, off);
1408 /* The above will be needed by the transport layer if there is one
1409 * immediately following this IP hdr.
1410 */
1411
1412 skb_gro_pull(skb, sizeof(*iph));
1413 skb_set_transport_header(skb, skb_gro_offset(skb));
1414
1415 pp = ops->callbacks.gro_receive(head, skb);
1416
1417 out_unlock:
1418 rcu_read_unlock();
1419
1420 out:
1421 NAPI_GRO_CB(skb)->flush |= flush;
1422
1423 return pp;
1424 }
1425
1426 static int inet_gro_complete(struct sk_buff *skb, int nhoff)
1427 {
1428 __be16 newlen = htons(skb->len - nhoff);
1429 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1430 const struct net_offload *ops;
1431 int proto = iph->protocol;
1432 int err = -ENOSYS;
1433
1434 csum_replace2(&iph->check, iph->tot_len, newlen);
1435 iph->tot_len = newlen;
1436
1437 rcu_read_lock();
1438 ops = rcu_dereference(inet_offloads[proto]);
1439 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1440 goto out_unlock;
1441
1442 /* Only need to add sizeof(*iph) to get to the next hdr below
1443 * because any hdr with option will have been flushed in
1444 * inet_gro_receive().
1445 */
1446 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1447
1448 out_unlock:
1449 rcu_read_unlock();
1450
1451 return err;
1452 }
1453
1454 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1455 unsigned short type, unsigned char protocol,
1456 struct net *net)
1457 {
1458 struct socket *sock;
1459 int rc = sock_create_kern(family, type, protocol, &sock);
1460
1461 if (rc == 0) {
1462 *sk = sock->sk;
1463 (*sk)->sk_allocation = GFP_ATOMIC;
1464 /*
1465 * Unhash it so that IP input processing does not even see it,
1466 * we do not wish this socket to see incoming packets.
1467 */
1468 (*sk)->sk_prot->unhash(*sk);
1469
1470 sk_change_net(*sk, net);
1471 }
1472 return rc;
1473 }
1474 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1475
1476 unsigned long snmp_fold_field(void __percpu *mib[], int offt)
1477 {
1478 unsigned long res = 0;
1479 int i, j;
1480
1481 for_each_possible_cpu(i) {
1482 for (j = 0; j < SNMP_ARRAY_SZ; j++)
1483 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt);
1484 }
1485 return res;
1486 }
1487 EXPORT_SYMBOL_GPL(snmp_fold_field);
1488
1489 #if BITS_PER_LONG==32
1490
1491 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset)
1492 {
1493 u64 res = 0;
1494 int cpu;
1495
1496 for_each_possible_cpu(cpu) {
1497 void *bhptr;
1498 struct u64_stats_sync *syncp;
1499 u64 v;
1500 unsigned int start;
1501
1502 bhptr = per_cpu_ptr(mib[0], cpu);
1503 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1504 do {
1505 start = u64_stats_fetch_begin_bh(syncp);
1506 v = *(((u64 *) bhptr) + offt);
1507 } while (u64_stats_fetch_retry_bh(syncp, start));
1508
1509 res += v;
1510 }
1511 return res;
1512 }
1513 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1514 #endif
1515
1516 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align)
1517 {
1518 BUG_ON(ptr == NULL);
1519 ptr[0] = __alloc_percpu(mibsize, align);
1520 if (!ptr[0])
1521 return -ENOMEM;
1522
1523 #if SNMP_ARRAY_SZ == 2
1524 ptr[1] = __alloc_percpu(mibsize, align);
1525 if (!ptr[1]) {
1526 free_percpu(ptr[0]);
1527 ptr[0] = NULL;
1528 return -ENOMEM;
1529 }
1530 #endif
1531 return 0;
1532 }
1533 EXPORT_SYMBOL_GPL(snmp_mib_init);
1534
1535 #ifdef CONFIG_IP_MULTICAST
1536 static const struct net_protocol igmp_protocol = {
1537 .handler = igmp_rcv,
1538 .netns_ok = 1,
1539 };
1540 #endif
1541
1542 static const struct net_protocol tcp_protocol = {
1543 .early_demux = tcp_v4_early_demux,
1544 .handler = tcp_v4_rcv,
1545 .err_handler = tcp_v4_err,
1546 .no_policy = 1,
1547 .netns_ok = 1,
1548 .icmp_strict_tag_validation = 1,
1549 };
1550
1551 static const struct net_protocol udp_protocol = {
1552 .early_demux = udp_v4_early_demux,
1553 .handler = udp_rcv,
1554 .err_handler = udp_err,
1555 .no_policy = 1,
1556 .netns_ok = 1,
1557 };
1558
1559 static const struct net_protocol icmp_protocol = {
1560 .handler = icmp_rcv,
1561 .err_handler = icmp_err,
1562 .no_policy = 1,
1563 .netns_ok = 1,
1564 };
1565
1566 static __net_init int ipv4_mib_init_net(struct net *net)
1567 {
1568 int i;
1569
1570 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics,
1571 sizeof(struct tcp_mib),
1572 __alignof__(struct tcp_mib)) < 0)
1573 goto err_tcp_mib;
1574 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics,
1575 sizeof(struct ipstats_mib),
1576 __alignof__(struct ipstats_mib)) < 0)
1577 goto err_ip_mib;
1578
1579 for_each_possible_cpu(i) {
1580 struct ipstats_mib *af_inet_stats;
1581 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics[0], i);
1582 u64_stats_init(&af_inet_stats->syncp);
1583 #if SNMP_ARRAY_SZ == 2
1584 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics[1], i);
1585 u64_stats_init(&af_inet_stats->syncp);
1586 #endif
1587 }
1588
1589 if (snmp_mib_init((void __percpu **)net->mib.net_statistics,
1590 sizeof(struct linux_mib),
1591 __alignof__(struct linux_mib)) < 0)
1592 goto err_net_mib;
1593 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics,
1594 sizeof(struct udp_mib),
1595 __alignof__(struct udp_mib)) < 0)
1596 goto err_udp_mib;
1597 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics,
1598 sizeof(struct udp_mib),
1599 __alignof__(struct udp_mib)) < 0)
1600 goto err_udplite_mib;
1601 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics,
1602 sizeof(struct icmp_mib),
1603 __alignof__(struct icmp_mib)) < 0)
1604 goto err_icmp_mib;
1605 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1606 GFP_KERNEL);
1607 if (!net->mib.icmpmsg_statistics)
1608 goto err_icmpmsg_mib;
1609
1610 tcp_mib_init(net);
1611 return 0;
1612
1613 err_icmpmsg_mib:
1614 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1615 err_icmp_mib:
1616 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1617 err_udplite_mib:
1618 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1619 err_udp_mib:
1620 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1621 err_net_mib:
1622 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1623 err_ip_mib:
1624 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
1625 err_tcp_mib:
1626 return -ENOMEM;
1627 }
1628
1629 static __net_exit void ipv4_mib_exit_net(struct net *net)
1630 {
1631 kfree(net->mib.icmpmsg_statistics);
1632 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1633 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1634 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1635 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1636 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1637 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
1638 }
1639
1640 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1641 .init = ipv4_mib_init_net,
1642 .exit = ipv4_mib_exit_net,
1643 };
1644
1645 static int __init init_ipv4_mibs(void)
1646 {
1647 return register_pernet_subsys(&ipv4_mib_ops);
1648 }
1649
1650 static int ipv4_proc_init(void);
1651
1652 /*
1653 * IP protocol layer initialiser
1654 */
1655
1656 static struct packet_offload ip_packet_offload __read_mostly = {
1657 .type = cpu_to_be16(ETH_P_IP),
1658 .callbacks = {
1659 .gso_send_check = inet_gso_send_check,
1660 .gso_segment = inet_gso_segment,
1661 .gro_receive = inet_gro_receive,
1662 .gro_complete = inet_gro_complete,
1663 },
1664 };
1665
1666 static const struct net_offload ipip_offload = {
1667 .callbacks = {
1668 .gso_send_check = inet_gso_send_check,
1669 .gso_segment = inet_gso_segment,
1670 },
1671 };
1672
1673 static int __init ipv4_offload_init(void)
1674 {
1675 /*
1676 * Add offloads
1677 */
1678 if (udpv4_offload_init() < 0)
1679 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1680 if (tcpv4_offload_init() < 0)
1681 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1682
1683 dev_add_offload(&ip_packet_offload);
1684 inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1685 return 0;
1686 }
1687
1688 fs_initcall(ipv4_offload_init);
1689
1690 static struct packet_type ip_packet_type __read_mostly = {
1691 .type = cpu_to_be16(ETH_P_IP),
1692 .func = ip_rcv,
1693 };
1694
1695 static int __init inet_init(void)
1696 {
1697 struct inet_protosw *q;
1698 struct list_head *r;
1699 int rc = -EINVAL;
1700
1701 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
1702
1703 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1704 if (!sysctl_local_reserved_ports)
1705 goto out;
1706
1707 rc = proto_register(&tcp_prot, 1);
1708 if (rc)
1709 goto out_free_reserved_ports;
1710
1711 rc = proto_register(&udp_prot, 1);
1712 if (rc)
1713 goto out_unregister_tcp_proto;
1714
1715 rc = proto_register(&raw_prot, 1);
1716 if (rc)
1717 goto out_unregister_udp_proto;
1718
1719 rc = proto_register(&ping_prot, 1);
1720 if (rc)
1721 goto out_unregister_raw_proto;
1722
1723 /*
1724 * Tell SOCKET that we are alive...
1725 */
1726
1727 (void)sock_register(&inet_family_ops);
1728
1729 #ifdef CONFIG_SYSCTL
1730 ip_static_sysctl_init();
1731 #endif
1732
1733 /*
1734 * Add all the base protocols.
1735 */
1736
1737 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1738 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1739 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1740 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1741 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1742 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1743 #ifdef CONFIG_IP_MULTICAST
1744 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1745 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1746 #endif
1747
1748 /* Register the socket-side information for inet_create. */
1749 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1750 INIT_LIST_HEAD(r);
1751
1752 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1753 inet_register_protosw(q);
1754
1755 /*
1756 * Set the ARP module up
1757 */
1758
1759 arp_init();
1760
1761 /*
1762 * Set the IP module up
1763 */
1764
1765 ip_init();
1766
1767 tcp_v4_init();
1768
1769 /* Setup TCP slab cache for open requests. */
1770 tcp_init();
1771
1772 /* Setup UDP memory threshold */
1773 udp_init();
1774
1775 /* Add UDP-Lite (RFC 3828) */
1776 udplite4_register();
1777
1778 ping_init();
1779
1780 /*
1781 * Set the ICMP layer up
1782 */
1783
1784 if (icmp_init() < 0)
1785 panic("Failed to create the ICMP control socket.\n");
1786
1787 /*
1788 * Initialise the multicast router
1789 */
1790 #if defined(CONFIG_IP_MROUTE)
1791 if (ip_mr_init())
1792 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1793 #endif
1794 /*
1795 * Initialise per-cpu ipv4 mibs
1796 */
1797
1798 if (init_ipv4_mibs())
1799 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1800
1801 ipv4_proc_init();
1802
1803 ipfrag_init();
1804
1805 dev_add_pack(&ip_packet_type);
1806
1807 rc = 0;
1808 out:
1809 return rc;
1810 out_unregister_raw_proto:
1811 proto_unregister(&raw_prot);
1812 out_unregister_udp_proto:
1813 proto_unregister(&udp_prot);
1814 out_unregister_tcp_proto:
1815 proto_unregister(&tcp_prot);
1816 out_free_reserved_ports:
1817 kfree(sysctl_local_reserved_ports);
1818 goto out;
1819 }
1820
1821 fs_initcall(inet_init);
1822
1823 /* ------------------------------------------------------------------------ */
1824
1825 #ifdef CONFIG_PROC_FS
1826 static int __init ipv4_proc_init(void)
1827 {
1828 int rc = 0;
1829
1830 if (raw_proc_init())
1831 goto out_raw;
1832 if (tcp4_proc_init())
1833 goto out_tcp;
1834 if (udp4_proc_init())
1835 goto out_udp;
1836 if (ping_proc_init())
1837 goto out_ping;
1838 if (ip_misc_proc_init())
1839 goto out_misc;
1840 out:
1841 return rc;
1842 out_misc:
1843 ping_proc_exit();
1844 out_ping:
1845 udp4_proc_exit();
1846 out_udp:
1847 tcp4_proc_exit();
1848 out_tcp:
1849 raw_proc_exit();
1850 out_raw:
1851 rc = -ENOMEM;
1852 goto out;
1853 }
1854
1855 #else /* CONFIG_PROC_FS */
1856 static int __init ipv4_proc_init(void)
1857 {
1858 return 0;
1859 }
1860 #endif /* CONFIG_PROC_FS */
1861
1862 MODULE_ALIAS_NETPROTO(PF_INET);
1863
Linux kernel - Deliverables
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