projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[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/kmod.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/ip_tunnels.h>
116 #include <net/xfrm.h>
117 #include <net/net_namespace.h>
118 #include <net/secure_seq.h>
119 #ifdef CONFIG_IP_MROUTE
120 #include <linux/mroute.h>
121 #endif
122 #include <net/l3mdev.h>
123
124
125 /* The inetsw table contains everything that inet_create needs to
126 * build a new socket.
127 */
128 static struct list_head inetsw[SOCK_MAX];
129 static DEFINE_SPINLOCK(inetsw_lock);
130
131 /* New destruction routine */
132
133 void inet_sock_destruct(struct sock *sk)
134 {
135 struct inet_sock *inet = inet_sk(sk);
136
137 __skb_queue_purge(&sk->sk_receive_queue);
138 __skb_queue_purge(&sk->sk_error_queue);
139
140 sk_mem_reclaim(sk);
141
142 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
143 pr_err("Attempt to release TCP socket in state %d %p\n",
144 sk->sk_state, sk);
145 return;
146 }
147 if (!sock_flag(sk, SOCK_DEAD)) {
148 pr_err("Attempt to release alive inet socket %p\n", sk);
149 return;
150 }
151
152 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
153 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
154 WARN_ON(sk->sk_wmem_queued);
155 WARN_ON(sk->sk_forward_alloc);
156
157 kfree(rcu_dereference_protected(inet->inet_opt, 1));
158 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
159 dst_release(sk->sk_rx_dst);
160 sk_refcnt_debug_dec(sk);
161 }
162 EXPORT_SYMBOL(inet_sock_destruct);
163
164 /*
165 * The routines beyond this point handle the behaviour of an AF_INET
166 * socket object. Mostly it punts to the subprotocols of IP to do
167 * the work.
168 */
169
170 /*
171 * Automatically bind an unbound socket.
172 */
173
174 static int inet_autobind(struct sock *sk)
175 {
176 struct inet_sock *inet;
177 /* We may need to bind the socket. */
178 lock_sock(sk);
179 inet = inet_sk(sk);
180 if (!inet->inet_num) {
181 if (sk->sk_prot->get_port(sk, 0)) {
182 release_sock(sk);
183 return -EAGAIN;
184 }
185 inet->inet_sport = htons(inet->inet_num);
186 }
187 release_sock(sk);
188 return 0;
189 }
190
191 /*
192 * Move a socket into listening state.
193 */
194 int inet_listen(struct socket *sock, int backlog)
195 {
196 struct sock *sk = sock->sk;
197 unsigned char old_state;
198 int err;
199
200 lock_sock(sk);
201
202 err = -EINVAL;
203 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
204 goto out;
205
206 old_state = sk->sk_state;
207 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
208 goto out;
209
210 /* Really, if the socket is already in listen state
211 * we can only allow the backlog to be adjusted.
212 */
213 if (old_state != TCP_LISTEN) {
214 /* Check special setups for testing purpose to enable TFO w/o
215 * requiring TCP_FASTOPEN sockopt.
216 * Note that only TCP sockets (SOCK_STREAM) will reach here.
217 * Also fastopenq may already been allocated because this
218 * socket was in TCP_LISTEN state previously but was
219 * shutdown() (rather than close()).
220 */
221 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 &&
222 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
223 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0)
224 fastopen_queue_tune(sk, backlog);
225 else if ((sysctl_tcp_fastopen &
226 TFO_SERVER_WO_SOCKOPT2) != 0)
227 fastopen_queue_tune(sk,
228 ((uint)sysctl_tcp_fastopen) >> 16);
229
230 tcp_fastopen_init_key_once(true);
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 if (protocol < 0 || protocol >= IPPROTO_MAX)
261 return -EINVAL;
262
263 sock->state = SS_UNCONNECTED;
264
265 /* Look for the requested type/protocol pair. */
266 lookup_protocol:
267 err = -ESOCKTNOSUPPORT;
268 rcu_read_lock();
269 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
270
271 err = 0;
272 /* Check the non-wild match. */
273 if (protocol == answer->protocol) {
274 if (protocol != IPPROTO_IP)
275 break;
276 } else {
277 /* Check for the two wild cases. */
278 if (IPPROTO_IP == protocol) {
279 protocol = answer->protocol;
280 break;
281 }
282 if (IPPROTO_IP == answer->protocol)
283 break;
284 }
285 err = -EPROTONOSUPPORT;
286 }
287
288 if (unlikely(err)) {
289 if (try_loading_module < 2) {
290 rcu_read_unlock();
291 /*
292 * Be more specific, e.g. net-pf-2-proto-132-type-1
293 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
294 */
295 if (++try_loading_module == 1)
296 request_module("net-pf-%d-proto-%d-type-%d",
297 PF_INET, protocol, sock->type);
298 /*
299 * Fall back to generic, e.g. net-pf-2-proto-132
300 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
301 */
302 else
303 request_module("net-pf-%d-proto-%d",
304 PF_INET, protocol);
305 goto lookup_protocol;
306 } else
307 goto out_rcu_unlock;
308 }
309
310 err = -EPERM;
311 if (sock->type == SOCK_RAW && !kern &&
312 !ns_capable(net->user_ns, CAP_NET_RAW))
313 goto out_rcu_unlock;
314
315 sock->ops = answer->ops;
316 answer_prot = answer->prot;
317 answer_flags = answer->flags;
318 rcu_read_unlock();
319
320 WARN_ON(!answer_prot->slab);
321
322 err = -ENOBUFS;
323 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
324 if (!sk)
325 goto out;
326
327 err = 0;
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 err = sk->sk_prot->hash(sk);
374 if (err) {
375 sk_common_release(sk);
376 goto out;
377 }
378 }
379
380 if (sk->sk_prot->init) {
381 err = sk->sk_prot->init(sk);
382 if (err)
383 sk_common_release(sk);
384 }
385 out:
386 return err;
387 out_rcu_unlock:
388 rcu_read_unlock();
389 goto out;
390 }
391
392
393 /*
394 * The peer socket should always be NULL (or else). When we call this
395 * function we are destroying the object and from then on nobody
396 * should refer to it.
397 */
398 int inet_release(struct socket *sock)
399 {
400 struct sock *sk = sock->sk;
401
402 if (sk) {
403 long timeout;
404
405 /* Applications forget to leave groups before exiting */
406 ip_mc_drop_socket(sk);
407
408 /* If linger is set, we don't return until the close
409 * is complete. Otherwise we return immediately. The
410 * actually closing is done the same either way.
411 *
412 * If the close is due to the process exiting, we never
413 * linger..
414 */
415 timeout = 0;
416 if (sock_flag(sk, SOCK_LINGER) &&
417 !(current->flags & PF_EXITING))
418 timeout = sk->sk_lingertime;
419 sock->sk = NULL;
420 sk->sk_prot->close(sk, timeout);
421 }
422 return 0;
423 }
424 EXPORT_SYMBOL(inet_release);
425
426 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
427 {
428 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
429 struct sock *sk = sock->sk;
430 struct inet_sock *inet = inet_sk(sk);
431 struct net *net = sock_net(sk);
432 unsigned short snum;
433 int chk_addr_ret;
434 u32 tb_id = RT_TABLE_LOCAL;
435 int err;
436
437 /* If the socket has its own bind function then use it. (RAW) */
438 if (sk->sk_prot->bind) {
439 err = sk->sk_prot->bind(sk, uaddr, addr_len);
440 goto out;
441 }
442 err = -EINVAL;
443 if (addr_len < sizeof(struct sockaddr_in))
444 goto out;
445
446 if (addr->sin_family != AF_INET) {
447 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
448 * only if s_addr is INADDR_ANY.
449 */
450 err = -EAFNOSUPPORT;
451 if (addr->sin_family != AF_UNSPEC ||
452 addr->sin_addr.s_addr != htonl(INADDR_ANY))
453 goto out;
454 }
455
456 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
457 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
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 (!net->ipv4.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 ((snum || !inet->bind_address_no_port) &&
501 sk->sk_prot->get_port(sk, snum)) {
502 inet->inet_saddr = inet->inet_rcv_saddr = 0;
503 err = -EADDRINUSE;
504 goto out_release_sock;
505 }
506
507 if (inet->inet_rcv_saddr)
508 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
509 if (snum)
510 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
511 inet->inet_sport = htons(inet->inet_num);
512 inet->inet_daddr = 0;
513 inet->inet_dport = 0;
514 sk_dst_reset(sk);
515 err = 0;
516 out_release_sock:
517 release_sock(sk);
518 out:
519 return err;
520 }
521 EXPORT_SYMBOL(inet_bind);
522
523 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
524 int addr_len, int flags)
525 {
526 struct sock *sk = sock->sk;
527
528 if (addr_len < sizeof(uaddr->sa_family))
529 return -EINVAL;
530 if (uaddr->sa_family == AF_UNSPEC)
531 return sk->sk_prot->disconnect(sk, flags);
532
533 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
534 return -EAGAIN;
535 return sk->sk_prot->connect(sk, uaddr, addr_len);
536 }
537 EXPORT_SYMBOL(inet_dgram_connect);
538
539 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
540 {
541 DEFINE_WAIT(wait);
542
543 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
544 sk->sk_write_pending += writebias;
545
546 /* Basic assumption: if someone sets sk->sk_err, he _must_
547 * change state of the socket from TCP_SYN_*.
548 * Connect() does not allow to get error notifications
549 * without closing the socket.
550 */
551 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
552 release_sock(sk);
553 timeo = schedule_timeout(timeo);
554 lock_sock(sk);
555 if (signal_pending(current) || !timeo)
556 break;
557 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
558 }
559 finish_wait(sk_sleep(sk), &wait);
560 sk->sk_write_pending -= writebias;
561 return timeo;
562 }
563
564 /*
565 * Connect to a remote host. There is regrettably still a little
566 * TCP 'magic' in here.
567 */
568 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
569 int addr_len, int flags)
570 {
571 struct sock *sk = sock->sk;
572 int err;
573 long timeo;
574
575 if (addr_len < sizeof(uaddr->sa_family))
576 return -EINVAL;
577
578 if (uaddr->sa_family == AF_UNSPEC) {
579 err = sk->sk_prot->disconnect(sk, flags);
580 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
581 goto out;
582 }
583
584 switch (sock->state) {
585 default:
586 err = -EINVAL;
587 goto out;
588 case SS_CONNECTED:
589 err = -EISCONN;
590 goto out;
591 case SS_CONNECTING:
592 err = -EALREADY;
593 /* Fall out of switch with err, set for this state */
594 break;
595 case SS_UNCONNECTED:
596 err = -EISCONN;
597 if (sk->sk_state != TCP_CLOSE)
598 goto out;
599
600 err = sk->sk_prot->connect(sk, uaddr, addr_len);
601 if (err < 0)
602 goto out;
603
604 sock->state = SS_CONNECTING;
605
606 /* Just entered SS_CONNECTING state; the only
607 * difference is that return value in non-blocking
608 * case is EINPROGRESS, rather than EALREADY.
609 */
610 err = -EINPROGRESS;
611 break;
612 }
613
614 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
615
616 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
617 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
618 tcp_sk(sk)->fastopen_req &&
619 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
620
621 /* Error code is set above */
622 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
623 goto out;
624
625 err = sock_intr_errno(timeo);
626 if (signal_pending(current))
627 goto out;
628 }
629
630 /* Connection was closed by RST, timeout, ICMP error
631 * or another process disconnected us.
632 */
633 if (sk->sk_state == TCP_CLOSE)
634 goto sock_error;
635
636 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
637 * and error was received after socket entered established state.
638 * Hence, it is handled normally after connect() return successfully.
639 */
640
641 sock->state = SS_CONNECTED;
642 err = 0;
643 out:
644 return err;
645
646 sock_error:
647 err = sock_error(sk) ? : -ECONNABORTED;
648 sock->state = SS_UNCONNECTED;
649 if (sk->sk_prot->disconnect(sk, flags))
650 sock->state = SS_DISCONNECTING;
651 goto out;
652 }
653 EXPORT_SYMBOL(__inet_stream_connect);
654
655 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
656 int addr_len, int flags)
657 {
658 int err;
659
660 lock_sock(sock->sk);
661 err = __inet_stream_connect(sock, uaddr, addr_len, flags);
662 release_sock(sock->sk);
663 return err;
664 }
665 EXPORT_SYMBOL(inet_stream_connect);
666
667 /*
668 * Accept a pending connection. The TCP layer now gives BSD semantics.
669 */
670
671 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
672 {
673 struct sock *sk1 = sock->sk;
674 int err = -EINVAL;
675 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
676
677 if (!sk2)
678 goto do_err;
679
680 lock_sock(sk2);
681
682 sock_rps_record_flow(sk2);
683 WARN_ON(!((1 << sk2->sk_state) &
684 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
685 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
686
687 sock_graft(sk2, newsock);
688
689 newsock->state = SS_CONNECTED;
690 err = 0;
691 release_sock(sk2);
692 do_err:
693 return err;
694 }
695 EXPORT_SYMBOL(inet_accept);
696
697
698 /*
699 * This does both peername and sockname.
700 */
701 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
702 int *uaddr_len, int peer)
703 {
704 struct sock *sk = sock->sk;
705 struct inet_sock *inet = inet_sk(sk);
706 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
707
708 sin->sin_family = AF_INET;
709 if (peer) {
710 if (!inet->inet_dport ||
711 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
712 peer == 1))
713 return -ENOTCONN;
714 sin->sin_port = inet->inet_dport;
715 sin->sin_addr.s_addr = inet->inet_daddr;
716 } else {
717 __be32 addr = inet->inet_rcv_saddr;
718 if (!addr)
719 addr = inet->inet_saddr;
720 sin->sin_port = inet->inet_sport;
721 sin->sin_addr.s_addr = addr;
722 }
723 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
724 *uaddr_len = sizeof(*sin);
725 return 0;
726 }
727 EXPORT_SYMBOL(inet_getname);
728
729 int inet_sendmsg(struct socket *sock, struct msghdr *msg, 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(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 socket *sock, struct msghdr *msg, size_t size,
763 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(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 .set_peek_off = sk_set_peek_off,
952 #ifdef CONFIG_COMPAT
953 .compat_setsockopt = compat_sock_common_setsockopt,
954 .compat_getsockopt = compat_sock_common_getsockopt,
955 .compat_ioctl = inet_compat_ioctl,
956 #endif
957 };
958 EXPORT_SYMBOL(inet_dgram_ops);
959
960 /*
961 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
962 * udp_poll
963 */
964 static const struct proto_ops inet_sockraw_ops = {
965 .family = PF_INET,
966 .owner = THIS_MODULE,
967 .release = inet_release,
968 .bind = inet_bind,
969 .connect = inet_dgram_connect,
970 .socketpair = sock_no_socketpair,
971 .accept = sock_no_accept,
972 .getname = inet_getname,
973 .poll = datagram_poll,
974 .ioctl = inet_ioctl,
975 .listen = sock_no_listen,
976 .shutdown = inet_shutdown,
977 .setsockopt = sock_common_setsockopt,
978 .getsockopt = sock_common_getsockopt,
979 .sendmsg = inet_sendmsg,
980 .recvmsg = inet_recvmsg,
981 .mmap = sock_no_mmap,
982 .sendpage = inet_sendpage,
983 #ifdef CONFIG_COMPAT
984 .compat_setsockopt = compat_sock_common_setsockopt,
985 .compat_getsockopt = compat_sock_common_getsockopt,
986 .compat_ioctl = inet_compat_ioctl,
987 #endif
988 };
989
990 static const struct net_proto_family inet_family_ops = {
991 .family = PF_INET,
992 .create = inet_create,
993 .owner = THIS_MODULE,
994 };
995
996 /* Upon startup we insert all the elements in inetsw_array[] into
997 * the linked list inetsw.
998 */
999 static struct inet_protosw inetsw_array[] =
1000 {
1001 {
1002 .type = SOCK_STREAM,
1003 .protocol = IPPROTO_TCP,
1004 .prot = &tcp_prot,
1005 .ops = &inet_stream_ops,
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 .flags = INET_PROTOSW_PERMANENT,
1016 },
1017
1018 {
1019 .type = SOCK_DGRAM,
1020 .protocol = IPPROTO_ICMP,
1021 .prot = &ping_prot,
1022 .ops = &inet_dgram_ops,
1023 .flags = INET_PROTOSW_REUSE,
1024 },
1025
1026 {
1027 .type = SOCK_RAW,
1028 .protocol = IPPROTO_IP, /* wild card */
1029 .prot = &raw_prot,
1030 .ops = &inet_sockraw_ops,
1031 .flags = INET_PROTOSW_REUSE,
1032 }
1033 };
1034
1035 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1036
1037 void inet_register_protosw(struct inet_protosw *p)
1038 {
1039 struct list_head *lh;
1040 struct inet_protosw *answer;
1041 int protocol = p->protocol;
1042 struct list_head *last_perm;
1043
1044 spin_lock_bh(&inetsw_lock);
1045
1046 if (p->type >= SOCK_MAX)
1047 goto out_illegal;
1048
1049 /* If we are trying to override a permanent protocol, bail. */
1050 last_perm = &inetsw[p->type];
1051 list_for_each(lh, &inetsw[p->type]) {
1052 answer = list_entry(lh, struct inet_protosw, list);
1053 /* Check only the non-wild match. */
1054 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1055 break;
1056 if (protocol == answer->protocol)
1057 goto out_permanent;
1058 last_perm = lh;
1059 }
1060
1061 /* Add the new entry after the last permanent entry if any, so that
1062 * the new entry does not override a permanent entry when matched with
1063 * a wild-card protocol. But it is allowed to override any existing
1064 * non-permanent entry. This means that when we remove this entry, the
1065 * system automatically returns to the old behavior.
1066 */
1067 list_add_rcu(&p->list, last_perm);
1068 out:
1069 spin_unlock_bh(&inetsw_lock);
1070
1071 return;
1072
1073 out_permanent:
1074 pr_err("Attempt to override permanent protocol %d\n", protocol);
1075 goto out;
1076
1077 out_illegal:
1078 pr_err("Ignoring attempt to register invalid socket type %d\n",
1079 p->type);
1080 goto out;
1081 }
1082 EXPORT_SYMBOL(inet_register_protosw);
1083
1084 void inet_unregister_protosw(struct inet_protosw *p)
1085 {
1086 if (INET_PROTOSW_PERMANENT & p->flags) {
1087 pr_err("Attempt to unregister permanent protocol %d\n",
1088 p->protocol);
1089 } else {
1090 spin_lock_bh(&inetsw_lock);
1091 list_del_rcu(&p->list);
1092 spin_unlock_bh(&inetsw_lock);
1093
1094 synchronize_net();
1095 }
1096 }
1097 EXPORT_SYMBOL(inet_unregister_protosw);
1098
1099 static int inet_sk_reselect_saddr(struct sock *sk)
1100 {
1101 struct inet_sock *inet = inet_sk(sk);
1102 __be32 old_saddr = inet->inet_saddr;
1103 __be32 daddr = inet->inet_daddr;
1104 struct flowi4 *fl4;
1105 struct rtable *rt;
1106 __be32 new_saddr;
1107 struct ip_options_rcu *inet_opt;
1108
1109 inet_opt = rcu_dereference_protected(inet->inet_opt,
1110 lockdep_sock_is_held(sk));
1111 if (inet_opt && inet_opt->opt.srr)
1112 daddr = inet_opt->opt.faddr;
1113
1114 /* Query new route. */
1115 fl4 = &inet->cork.fl.u.ip4;
1116 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1117 sk->sk_bound_dev_if, sk->sk_protocol,
1118 inet->inet_sport, inet->inet_dport, sk);
1119 if (IS_ERR(rt))
1120 return PTR_ERR(rt);
1121
1122 sk_setup_caps(sk, &rt->dst);
1123
1124 new_saddr = fl4->saddr;
1125
1126 if (new_saddr == old_saddr)
1127 return 0;
1128
1129 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1130 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1131 __func__, &old_saddr, &new_saddr);
1132 }
1133
1134 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1135
1136 /*
1137 * XXX The only one ugly spot where we need to
1138 * XXX really change the sockets identity after
1139 * XXX it has entered the hashes. -DaveM
1140 *
1141 * Besides that, it does not check for connection
1142 * uniqueness. Wait for troubles.
1143 */
1144 return __sk_prot_rehash(sk);
1145 }
1146
1147 int inet_sk_rebuild_header(struct sock *sk)
1148 {
1149 struct inet_sock *inet = inet_sk(sk);
1150 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1151 __be32 daddr;
1152 struct ip_options_rcu *inet_opt;
1153 struct flowi4 *fl4;
1154 int err;
1155
1156 /* Route is OK, nothing to do. */
1157 if (rt)
1158 return 0;
1159
1160 /* Reroute. */
1161 rcu_read_lock();
1162 inet_opt = rcu_dereference(inet->inet_opt);
1163 daddr = inet->inet_daddr;
1164 if (inet_opt && inet_opt->opt.srr)
1165 daddr = inet_opt->opt.faddr;
1166 rcu_read_unlock();
1167 fl4 = &inet->cork.fl.u.ip4;
1168 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1169 inet->inet_dport, inet->inet_sport,
1170 sk->sk_protocol, RT_CONN_FLAGS(sk),
1171 sk->sk_bound_dev_if);
1172 if (!IS_ERR(rt)) {
1173 err = 0;
1174 sk_setup_caps(sk, &rt->dst);
1175 } else {
1176 err = PTR_ERR(rt);
1177
1178 /* Routing failed... */
1179 sk->sk_route_caps = 0;
1180 /*
1181 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1182 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1183 */
1184 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1185 sk->sk_state != TCP_SYN_SENT ||
1186 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1187 (err = inet_sk_reselect_saddr(sk)) != 0)
1188 sk->sk_err_soft = -err;
1189 }
1190
1191 return err;
1192 }
1193 EXPORT_SYMBOL(inet_sk_rebuild_header);
1194
1195 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1196 netdev_features_t features)
1197 {
1198 bool udpfrag = false, fixedid = false, encap;
1199 struct sk_buff *segs = ERR_PTR(-EINVAL);
1200 const struct net_offload *ops;
1201 unsigned int offset = 0;
1202 struct iphdr *iph;
1203 int proto, tot_len;
1204 int nhoff;
1205 int ihl;
1206 int id;
1207
1208 skb_reset_network_header(skb);
1209 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1210 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1211 goto out;
1212
1213 iph = ip_hdr(skb);
1214 ihl = iph->ihl * 4;
1215 if (ihl < sizeof(*iph))
1216 goto out;
1217
1218 id = ntohs(iph->id);
1219 proto = iph->protocol;
1220
1221 /* Warning: after this point, iph might be no longer valid */
1222 if (unlikely(!pskb_may_pull(skb, ihl)))
1223 goto out;
1224 __skb_pull(skb, ihl);
1225
1226 encap = SKB_GSO_CB(skb)->encap_level > 0;
1227 if (encap)
1228 features &= skb->dev->hw_enc_features;
1229 SKB_GSO_CB(skb)->encap_level += ihl;
1230
1231 skb_reset_transport_header(skb);
1232
1233 segs = ERR_PTR(-EPROTONOSUPPORT);
1234
1235 if (!skb->encapsulation || encap) {
1236 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1237 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1238
1239 /* fixed ID is invalid if DF bit is not set */
1240 if (fixedid && !(iph->frag_off & htons(IP_DF)))
1241 goto out;
1242 }
1243
1244 ops = rcu_dereference(inet_offloads[proto]);
1245 if (likely(ops && ops->callbacks.gso_segment))
1246 segs = ops->callbacks.gso_segment(skb, features);
1247
1248 if (IS_ERR_OR_NULL(segs))
1249 goto out;
1250
1251 skb = segs;
1252 do {
1253 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1254 if (udpfrag) {
1255 iph->frag_off = htons(offset >> 3);
1256 if (skb->next)
1257 iph->frag_off |= htons(IP_MF);
1258 offset += skb->len - nhoff - ihl;
1259 tot_len = skb->len - nhoff;
1260 } else if (skb_is_gso(skb)) {
1261 if (!fixedid) {
1262 iph->id = htons(id);
1263 id += skb_shinfo(skb)->gso_segs;
1264 }
1265 tot_len = skb_shinfo(skb)->gso_size +
1266 SKB_GSO_CB(skb)->data_offset +
1267 skb->head - (unsigned char *)iph;
1268 } else {
1269 if (!fixedid)
1270 iph->id = htons(id++);
1271 tot_len = skb->len - nhoff;
1272 }
1273 iph->tot_len = htons(tot_len);
1274 ip_send_check(iph);
1275 if (encap)
1276 skb_reset_inner_headers(skb);
1277 skb->network_header = (u8 *)iph - skb->head;
1278 } while ((skb = skb->next));
1279
1280 out:
1281 return segs;
1282 }
1283 EXPORT_SYMBOL(inet_gso_segment);
1284
1285 struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb)
1286 {
1287 const struct net_offload *ops;
1288 struct sk_buff **pp = NULL;
1289 struct sk_buff *p;
1290 const struct iphdr *iph;
1291 unsigned int hlen;
1292 unsigned int off;
1293 unsigned int id;
1294 int flush = 1;
1295 int proto;
1296
1297 off = skb_gro_offset(skb);
1298 hlen = off + sizeof(*iph);
1299 iph = skb_gro_header_fast(skb, off);
1300 if (skb_gro_header_hard(skb, hlen)) {
1301 iph = skb_gro_header_slow(skb, hlen, off);
1302 if (unlikely(!iph))
1303 goto out;
1304 }
1305
1306 proto = iph->protocol;
1307
1308 rcu_read_lock();
1309 ops = rcu_dereference(inet_offloads[proto]);
1310 if (!ops || !ops->callbacks.gro_receive)
1311 goto out_unlock;
1312
1313 if (*(u8 *)iph != 0x45)
1314 goto out_unlock;
1315
1316 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1317 goto out_unlock;
1318
1319 id = ntohl(*(__be32 *)&iph->id);
1320 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1321 id >>= 16;
1322
1323 for (p = *head; p; p = p->next) {
1324 struct iphdr *iph2;
1325 u16 flush_id;
1326
1327 if (!NAPI_GRO_CB(p)->same_flow)
1328 continue;
1329
1330 iph2 = (struct iphdr *)(p->data + off);
1331 /* The above works because, with the exception of the top
1332 * (inner most) layer, we only aggregate pkts with the same
1333 * hdr length so all the hdrs we'll need to verify will start
1334 * at the same offset.
1335 */
1336 if ((iph->protocol ^ iph2->protocol) |
1337 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1338 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1339 NAPI_GRO_CB(p)->same_flow = 0;
1340 continue;
1341 }
1342
1343 /* All fields must match except length and checksum. */
1344 NAPI_GRO_CB(p)->flush |=
1345 (iph->ttl ^ iph2->ttl) |
1346 (iph->tos ^ iph2->tos) |
1347 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1348
1349 NAPI_GRO_CB(p)->flush |= flush;
1350
1351 /* We need to store of the IP ID check to be included later
1352 * when we can verify that this packet does in fact belong
1353 * to a given flow.
1354 */
1355 flush_id = (u16)(id - ntohs(iph2->id));
1356
1357 /* This bit of code makes it much easier for us to identify
1358 * the cases where we are doing atomic vs non-atomic IP ID
1359 * checks. Specifically an atomic check can return IP ID
1360 * values 0 - 0xFFFF, while a non-atomic check can only
1361 * return 0 or 0xFFFF.
1362 */
1363 if (!NAPI_GRO_CB(p)->is_atomic ||
1364 !(iph->frag_off & htons(IP_DF))) {
1365 flush_id ^= NAPI_GRO_CB(p)->count;
1366 flush_id = flush_id ? 0xFFFF : 0;
1367 }
1368
1369 /* If the previous IP ID value was based on an atomic
1370 * datagram we can overwrite the value and ignore it.
1371 */
1372 if (NAPI_GRO_CB(skb)->is_atomic)
1373 NAPI_GRO_CB(p)->flush_id = flush_id;
1374 else
1375 NAPI_GRO_CB(p)->flush_id |= flush_id;
1376 }
1377
1378 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1379 NAPI_GRO_CB(skb)->flush |= flush;
1380 skb_set_network_header(skb, off);
1381 /* The above will be needed by the transport layer if there is one
1382 * immediately following this IP hdr.
1383 */
1384
1385 /* Note : No need to call skb_gro_postpull_rcsum() here,
1386 * as we already checked checksum over ipv4 header was 0
1387 */
1388 skb_gro_pull(skb, sizeof(*iph));
1389 skb_set_transport_header(skb, skb_gro_offset(skb));
1390
1391 pp = ops->callbacks.gro_receive(head, skb);
1392
1393 out_unlock:
1394 rcu_read_unlock();
1395
1396 out:
1397 NAPI_GRO_CB(skb)->flush |= flush;
1398
1399 return pp;
1400 }
1401 EXPORT_SYMBOL(inet_gro_receive);
1402
1403 static struct sk_buff **ipip_gro_receive(struct sk_buff **head,
1404 struct sk_buff *skb)
1405 {
1406 if (NAPI_GRO_CB(skb)->encap_mark) {
1407 NAPI_GRO_CB(skb)->flush = 1;
1408 return NULL;
1409 }
1410
1411 NAPI_GRO_CB(skb)->encap_mark = 1;
1412
1413 return inet_gro_receive(head, skb);
1414 }
1415
1416 #define SECONDS_PER_DAY 86400
1417
1418 /* inet_current_timestamp - Return IP network timestamp
1419 *
1420 * Return milliseconds since midnight in network byte order.
1421 */
1422 __be32 inet_current_timestamp(void)
1423 {
1424 u32 secs;
1425 u32 msecs;
1426 struct timespec64 ts;
1427
1428 ktime_get_real_ts64(&ts);
1429
1430 /* Get secs since midnight. */
1431 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1432 /* Convert to msecs. */
1433 msecs = secs * MSEC_PER_SEC;
1434 /* Convert nsec to msec. */
1435 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1436
1437 /* Convert to network byte order. */
1438 return htonl(msecs);
1439 }
1440 EXPORT_SYMBOL(inet_current_timestamp);
1441
1442 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1443 {
1444 if (sk->sk_family == AF_INET)
1445 return ip_recv_error(sk, msg, len, addr_len);
1446 #if IS_ENABLED(CONFIG_IPV6)
1447 if (sk->sk_family == AF_INET6)
1448 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1449 #endif
1450 return -EINVAL;
1451 }
1452
1453 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1454 {
1455 __be16 newlen = htons(skb->len - nhoff);
1456 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1457 const struct net_offload *ops;
1458 int proto = iph->protocol;
1459 int err = -ENOSYS;
1460
1461 if (skb->encapsulation)
1462 skb_set_inner_network_header(skb, nhoff);
1463
1464 csum_replace2(&iph->check, iph->tot_len, newlen);
1465 iph->tot_len = newlen;
1466
1467 rcu_read_lock();
1468 ops = rcu_dereference(inet_offloads[proto]);
1469 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1470 goto out_unlock;
1471
1472 /* Only need to add sizeof(*iph) to get to the next hdr below
1473 * because any hdr with option will have been flushed in
1474 * inet_gro_receive().
1475 */
1476 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1477
1478 out_unlock:
1479 rcu_read_unlock();
1480
1481 return err;
1482 }
1483 EXPORT_SYMBOL(inet_gro_complete);
1484
1485 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1486 {
1487 skb->encapsulation = 1;
1488 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1489 return inet_gro_complete(skb, nhoff);
1490 }
1491
1492 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1493 unsigned short type, unsigned char protocol,
1494 struct net *net)
1495 {
1496 struct socket *sock;
1497 int rc = sock_create_kern(net, family, type, protocol, &sock);
1498
1499 if (rc == 0) {
1500 *sk = sock->sk;
1501 (*sk)->sk_allocation = GFP_ATOMIC;
1502 /*
1503 * Unhash it so that IP input processing does not even see it,
1504 * we do not wish this socket to see incoming packets.
1505 */
1506 (*sk)->sk_prot->unhash(*sk);
1507 }
1508 return rc;
1509 }
1510 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1511
1512 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1513 {
1514 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1515 }
1516 EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1517
1518 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1519 {
1520 unsigned long res = 0;
1521 int i;
1522
1523 for_each_possible_cpu(i)
1524 res += snmp_get_cpu_field(mib, i, offt);
1525 return res;
1526 }
1527 EXPORT_SYMBOL_GPL(snmp_fold_field);
1528
1529 #if BITS_PER_LONG==32
1530
1531 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1532 size_t syncp_offset)
1533 {
1534 void *bhptr;
1535 struct u64_stats_sync *syncp;
1536 u64 v;
1537 unsigned int start;
1538
1539 bhptr = per_cpu_ptr(mib, cpu);
1540 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1541 do {
1542 start = u64_stats_fetch_begin_irq(syncp);
1543 v = *(((u64 *)bhptr) + offt);
1544 } while (u64_stats_fetch_retry_irq(syncp, start));
1545
1546 return v;
1547 }
1548 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1549
1550 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1551 {
1552 u64 res = 0;
1553 int cpu;
1554
1555 for_each_possible_cpu(cpu) {
1556 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1557 }
1558 return res;
1559 }
1560 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1561 #endif
1562
1563 #ifdef CONFIG_IP_MULTICAST
1564 static const struct net_protocol igmp_protocol = {
1565 .handler = igmp_rcv,
1566 .netns_ok = 1,
1567 };
1568 #endif
1569
1570 static const struct net_protocol tcp_protocol = {
1571 .early_demux = tcp_v4_early_demux,
1572 .handler = tcp_v4_rcv,
1573 .err_handler = tcp_v4_err,
1574 .no_policy = 1,
1575 .netns_ok = 1,
1576 .icmp_strict_tag_validation = 1,
1577 };
1578
1579 static const struct net_protocol udp_protocol = {
1580 .early_demux = udp_v4_early_demux,
1581 .handler = udp_rcv,
1582 .err_handler = udp_err,
1583 .no_policy = 1,
1584 .netns_ok = 1,
1585 };
1586
1587 static const struct net_protocol icmp_protocol = {
1588 .handler = icmp_rcv,
1589 .err_handler = icmp_err,
1590 .no_policy = 1,
1591 .netns_ok = 1,
1592 };
1593
1594 static __net_init int ipv4_mib_init_net(struct net *net)
1595 {
1596 int i;
1597
1598 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1599 if (!net->mib.tcp_statistics)
1600 goto err_tcp_mib;
1601 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1602 if (!net->mib.ip_statistics)
1603 goto err_ip_mib;
1604
1605 for_each_possible_cpu(i) {
1606 struct ipstats_mib *af_inet_stats;
1607 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1608 u64_stats_init(&af_inet_stats->syncp);
1609 }
1610
1611 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1612 if (!net->mib.net_statistics)
1613 goto err_net_mib;
1614 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1615 if (!net->mib.udp_statistics)
1616 goto err_udp_mib;
1617 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1618 if (!net->mib.udplite_statistics)
1619 goto err_udplite_mib;
1620 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1621 if (!net->mib.icmp_statistics)
1622 goto err_icmp_mib;
1623 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1624 GFP_KERNEL);
1625 if (!net->mib.icmpmsg_statistics)
1626 goto err_icmpmsg_mib;
1627
1628 tcp_mib_init(net);
1629 return 0;
1630
1631 err_icmpmsg_mib:
1632 free_percpu(net->mib.icmp_statistics);
1633 err_icmp_mib:
1634 free_percpu(net->mib.udplite_statistics);
1635 err_udplite_mib:
1636 free_percpu(net->mib.udp_statistics);
1637 err_udp_mib:
1638 free_percpu(net->mib.net_statistics);
1639 err_net_mib:
1640 free_percpu(net->mib.ip_statistics);
1641 err_ip_mib:
1642 free_percpu(net->mib.tcp_statistics);
1643 err_tcp_mib:
1644 return -ENOMEM;
1645 }
1646
1647 static __net_exit void ipv4_mib_exit_net(struct net *net)
1648 {
1649 kfree(net->mib.icmpmsg_statistics);
1650 free_percpu(net->mib.icmp_statistics);
1651 free_percpu(net->mib.udplite_statistics);
1652 free_percpu(net->mib.udp_statistics);
1653 free_percpu(net->mib.net_statistics);
1654 free_percpu(net->mib.ip_statistics);
1655 free_percpu(net->mib.tcp_statistics);
1656 }
1657
1658 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1659 .init = ipv4_mib_init_net,
1660 .exit = ipv4_mib_exit_net,
1661 };
1662
1663 static int __init init_ipv4_mibs(void)
1664 {
1665 return register_pernet_subsys(&ipv4_mib_ops);
1666 }
1667
1668 static __net_init int inet_init_net(struct net *net)
1669 {
1670 /*
1671 * Set defaults for local port range
1672 */
1673 seqlock_init(&net->ipv4.ip_local_ports.lock);
1674 net->ipv4.ip_local_ports.range[0] = 32768;
1675 net->ipv4.ip_local_ports.range[1] = 60999;
1676
1677 seqlock_init(&net->ipv4.ping_group_range.lock);
1678 /*
1679 * Sane defaults - nobody may create ping sockets.
1680 * Boot scripts should set this to distro-specific group.
1681 */
1682 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1683 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1684
1685 /* Default values for sysctl-controlled parameters.
1686 * We set them here, in case sysctl is not compiled.
1687 */
1688 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1689 net->ipv4.sysctl_ip_dynaddr = 0;
1690 net->ipv4.sysctl_ip_early_demux = 1;
1691
1692 return 0;
1693 }
1694
1695 static __net_exit void inet_exit_net(struct net *net)
1696 {
1697 }
1698
1699 static __net_initdata struct pernet_operations af_inet_ops = {
1700 .init = inet_init_net,
1701 .exit = inet_exit_net,
1702 };
1703
1704 static int __init init_inet_pernet_ops(void)
1705 {
1706 return register_pernet_subsys(&af_inet_ops);
1707 }
1708
1709 static int ipv4_proc_init(void);
1710
1711 /*
1712 * IP protocol layer initialiser
1713 */
1714
1715 static struct packet_offload ip_packet_offload __read_mostly = {
1716 .type = cpu_to_be16(ETH_P_IP),
1717 .callbacks = {
1718 .gso_segment = inet_gso_segment,
1719 .gro_receive = inet_gro_receive,
1720 .gro_complete = inet_gro_complete,
1721 },
1722 };
1723
1724 static const struct net_offload ipip_offload = {
1725 .callbacks = {
1726 .gso_segment = inet_gso_segment,
1727 .gro_receive = ipip_gro_receive,
1728 .gro_complete = ipip_gro_complete,
1729 },
1730 };
1731
1732 static int __init ipv4_offload_init(void)
1733 {
1734 /*
1735 * Add offloads
1736 */
1737 if (udpv4_offload_init() < 0)
1738 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1739 if (tcpv4_offload_init() < 0)
1740 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1741
1742 dev_add_offload(&ip_packet_offload);
1743 inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1744 return 0;
1745 }
1746
1747 fs_initcall(ipv4_offload_init);
1748
1749 static struct packet_type ip_packet_type __read_mostly = {
1750 .type = cpu_to_be16(ETH_P_IP),
1751 .func = ip_rcv,
1752 };
1753
1754 static int __init inet_init(void)
1755 {
1756 struct inet_protosw *q;
1757 struct list_head *r;
1758 int rc = -EINVAL;
1759
1760 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1761
1762 rc = proto_register(&tcp_prot, 1);
1763 if (rc)
1764 goto out;
1765
1766 rc = proto_register(&udp_prot, 1);
1767 if (rc)
1768 goto out_unregister_tcp_proto;
1769
1770 rc = proto_register(&raw_prot, 1);
1771 if (rc)
1772 goto out_unregister_udp_proto;
1773
1774 rc = proto_register(&ping_prot, 1);
1775 if (rc)
1776 goto out_unregister_raw_proto;
1777
1778 /*
1779 * Tell SOCKET that we are alive...
1780 */
1781
1782 (void)sock_register(&inet_family_ops);
1783
1784 #ifdef CONFIG_SYSCTL
1785 ip_static_sysctl_init();
1786 #endif
1787
1788 /*
1789 * Add all the base protocols.
1790 */
1791
1792 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1793 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1794 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1795 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1796 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1797 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1798 #ifdef CONFIG_IP_MULTICAST
1799 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1800 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1801 #endif
1802
1803 /* Register the socket-side information for inet_create. */
1804 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1805 INIT_LIST_HEAD(r);
1806
1807 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1808 inet_register_protosw(q);
1809
1810 /*
1811 * Set the ARP module up
1812 */
1813
1814 arp_init();
1815
1816 /*
1817 * Set the IP module up
1818 */
1819
1820 ip_init();
1821
1822 tcp_v4_init();
1823
1824 /* Setup TCP slab cache for open requests. */
1825 tcp_init();
1826
1827 /* Setup UDP memory threshold */
1828 udp_init();
1829
1830 /* Add UDP-Lite (RFC 3828) */
1831 udplite4_register();
1832
1833 ping_init();
1834
1835 /*
1836 * Set the ICMP layer up
1837 */
1838
1839 if (icmp_init() < 0)
1840 panic("Failed to create the ICMP control socket.\n");
1841
1842 /*
1843 * Initialise the multicast router
1844 */
1845 #if defined(CONFIG_IP_MROUTE)
1846 if (ip_mr_init())
1847 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1848 #endif
1849
1850 if (init_inet_pernet_ops())
1851 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
1852 /*
1853 * Initialise per-cpu ipv4 mibs
1854 */
1855
1856 if (init_ipv4_mibs())
1857 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1858
1859 ipv4_proc_init();
1860
1861 ipfrag_init();
1862
1863 dev_add_pack(&ip_packet_type);
1864
1865 ip_tunnel_core_init();
1866
1867 rc = 0;
1868 out:
1869 return rc;
1870 out_unregister_raw_proto:
1871 proto_unregister(&raw_prot);
1872 out_unregister_udp_proto:
1873 proto_unregister(&udp_prot);
1874 out_unregister_tcp_proto:
1875 proto_unregister(&tcp_prot);
1876 goto out;
1877 }
1878
1879 fs_initcall(inet_init);
1880
1881 /* ------------------------------------------------------------------------ */
1882
1883 #ifdef CONFIG_PROC_FS
1884 static int __init ipv4_proc_init(void)
1885 {
1886 int rc = 0;
1887
1888 if (raw_proc_init())
1889 goto out_raw;
1890 if (tcp4_proc_init())
1891 goto out_tcp;
1892 if (udp4_proc_init())
1893 goto out_udp;
1894 if (ping_proc_init())
1895 goto out_ping;
1896 if (ip_misc_proc_init())
1897 goto out_misc;
1898 out:
1899 return rc;
1900 out_misc:
1901 ping_proc_exit();
1902 out_ping:
1903 udp4_proc_exit();
1904 out_udp:
1905 tcp4_proc_exit();
1906 out_tcp:
1907 raw_proc_exit();
1908 out_raw:
1909 rc = -ENOMEM;
1910 goto out;
1911 }
1912
1913 #else /* CONFIG_PROC_FS */
1914 static int __init ipv4_proc_init(void)
1915 {
1916 return 0;
1917 }
1918 #endif /* CONFIG_PROC_FS */
Linux kernel - Deliverables
This page took 0.066782 seconds and 6 git commands to generate.