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1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * PF_INET protocol family socket handler.
7 *
8 * Authors: Ross Biro
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Florian La Roche, <flla@stud.uni-sb.de>
11 * Alan Cox, <A.Cox@swansea.ac.uk>
12 *
13 * Changes (see also sock.c)
14 *
15 * piggy,
16 * Karl Knutson : Socket protocol table
17 * A.N.Kuznetsov : Socket death error in accept().
18 * John Richardson : Fix non blocking error in connect()
19 * so sockets that fail to connect
20 * don't return -EINPROGRESS.
21 * Alan Cox : Asynchronous I/O support
22 * Alan Cox : Keep correct socket pointer on sock
23 * structures
24 * when accept() ed
25 * Alan Cox : Semantics of SO_LINGER aren't state
26 * moved to close when you look carefully.
27 * With this fixed and the accept bug fixed
28 * some RPC stuff seems happier.
29 * Niibe Yutaka : 4.4BSD style write async I/O
30 * Alan Cox,
31 * Tony Gale : Fixed reuse semantics.
32 * Alan Cox : bind() shouldn't abort existing but dead
33 * sockets. Stops FTP netin:.. I hope.
34 * Alan Cox : bind() works correctly for RAW sockets.
35 * Note that FreeBSD at least was broken
36 * in this respect so be careful with
37 * compatibility tests...
38 * Alan Cox : routing cache support
39 * Alan Cox : memzero the socket structure for
40 * compactness.
41 * Matt Day : nonblock connect error handler
42 * Alan Cox : Allow large numbers of pending sockets
43 * (eg for big web sites), but only if
44 * specifically application requested.
45 * Alan Cox : New buffering throughout IP. Used
46 * dumbly.
47 * Alan Cox : New buffering now used smartly.
48 * Alan Cox : BSD rather than common sense
49 * interpretation of listen.
50 * Germano Caronni : Assorted small races.
51 * Alan Cox : sendmsg/recvmsg basic support.
52 * Alan Cox : Only sendmsg/recvmsg now supported.
53 * Alan Cox : Locked down bind (see security list).
54 * Alan Cox : Loosened bind a little.
55 * Mike McLagan : ADD/DEL DLCI Ioctls
56 * Willy Konynenberg : Transparent proxying support.
57 * David S. Miller : New socket lookup architecture.
58 * Some other random speedups.
59 * Cyrus Durgin : Cleaned up file for kmod hacks.
60 * Andi Kleen : Fix inet_stream_connect TCP race.
61 *
62 * This program is free software; you can redistribute it and/or
63 * modify it under the terms of the GNU General Public License
64 * as published by the Free Software Foundation; either version
65 * 2 of the License, or (at your option) any later version.
66 */
67
68#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 <linux/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#include <trace/events/sock.h>
125
126/* The inetsw table contains everything that inet_create needs to
127 * build a new socket.
128 */
129static struct list_head inetsw[SOCK_MAX];
130static DEFINE_SPINLOCK(inetsw_lock);
131
132/* New destruction routine */
133
134void inet_sock_destruct(struct sock *sk)
135{
136 struct inet_sock *inet = inet_sk(sk);
137
138 __skb_queue_purge(&sk->sk_receive_queue);
139 __skb_queue_purge(&sk->sk_error_queue);
140
141 sk_mem_reclaim(sk);
142
143 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
144 pr_err("Attempt to release TCP socket in state %d %p\n",
145 sk->sk_state, sk);
146 return;
147 }
148 if (!sock_flag(sk, SOCK_DEAD)) {
149 pr_err("Attempt to release alive inet socket %p\n", sk);
150 return;
151 }
152
153 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
154 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
155 WARN_ON(sk->sk_wmem_queued);
156 WARN_ON(sk->sk_forward_alloc);
157
158 kfree(rcu_dereference_protected(inet->inet_opt, 1));
159 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
160 dst_release(sk->sk_rx_dst);
161 sk_refcnt_debug_dec(sk);
162}
163EXPORT_SYMBOL(inet_sock_destruct);
164
165/*
166 * The routines beyond this point handle the behaviour of an AF_INET
167 * socket object. Mostly it punts to the subprotocols of IP to do
168 * the work.
169 */
170
171/*
172 * Automatically bind an unbound socket.
173 */
174
175static int inet_autobind(struct sock *sk)
176{
177 struct inet_sock *inet;
178 /* We may need to bind the socket. */
179 lock_sock(sk);
180 inet = inet_sk(sk);
181 if (!inet->inet_num) {
182 if (sk->sk_prot->get_port(sk, 0)) {
183 release_sock(sk);
184 return -EAGAIN;
185 }
186 inet->inet_sport = htons(inet->inet_num);
187 }
188 release_sock(sk);
189 return 0;
190}
191
192/*
193 * Move a socket into listening state.
194 */
195int inet_listen(struct socket *sock, int backlog)
196{
197 struct sock *sk = sock->sk;
198 unsigned char old_state;
199 int err, tcp_fastopen;
200
201 lock_sock(sk);
202
203 err = -EINVAL;
204 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
205 goto out;
206
207 old_state = sk->sk_state;
208 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
209 goto out;
210
211 /* Really, if the socket is already in listen state
212 * we can only allow the backlog to be adjusted.
213 */
214 if (old_state != TCP_LISTEN) {
215 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
216 * Note that only TCP sockets (SOCK_STREAM) will reach here.
217 * Also fastopen backlog may already been set via the option
218 * because the socket was in TCP_LISTEN state previously but
219 * was shutdown() rather than close().
220 */
221 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen;
222 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
223 (tcp_fastopen & TFO_SERVER_ENABLE) &&
224 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
225 fastopen_queue_tune(sk, backlog);
226 tcp_fastopen_init_key_once(sock_net(sk));
227 }
228
229 err = inet_csk_listen_start(sk, backlog);
230 if (err)
231 goto out;
232 }
233 sk->sk_max_ack_backlog = backlog;
234 err = 0;
235
236out:
237 release_sock(sk);
238 return err;
239}
240EXPORT_SYMBOL(inet_listen);
241
242/*
243 * Create an inet socket.
244 */
245
246static int inet_create(struct net *net, struct socket *sock, int protocol,
247 int kern)
248{
249 struct sock *sk;
250 struct inet_protosw *answer;
251 struct inet_sock *inet;
252 struct proto *answer_prot;
253 unsigned char answer_flags;
254 int try_loading_module = 0;
255 int err;
256
257 if (protocol < 0 || protocol >= IPPROTO_MAX)
258 return -EINVAL;
259
260 sock->state = SS_UNCONNECTED;
261
262 /* Look for the requested type/protocol pair. */
263lookup_protocol:
264 err = -ESOCKTNOSUPPORT;
265 rcu_read_lock();
266 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
267
268 err = 0;
269 /* Check the non-wild match. */
270 if (protocol == answer->protocol) {
271 if (protocol != IPPROTO_IP)
272 break;
273 } else {
274 /* Check for the two wild cases. */
275 if (IPPROTO_IP == protocol) {
276 protocol = answer->protocol;
277 break;
278 }
279 if (IPPROTO_IP == answer->protocol)
280 break;
281 }
282 err = -EPROTONOSUPPORT;
283 }
284
285 if (unlikely(err)) {
286 if (try_loading_module < 2) {
287 rcu_read_unlock();
288 /*
289 * Be more specific, e.g. net-pf-2-proto-132-type-1
290 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
291 */
292 if (++try_loading_module == 1)
293 request_module("net-pf-%d-proto-%d-type-%d",
294 PF_INET, protocol, sock->type);
295 /*
296 * Fall back to generic, e.g. net-pf-2-proto-132
297 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
298 */
299 else
300 request_module("net-pf-%d-proto-%d",
301 PF_INET, protocol);
302 goto lookup_protocol;
303 } else
304 goto out_rcu_unlock;
305 }
306
307 err = -EPERM;
308 if (sock->type == SOCK_RAW && !kern &&
309 !ns_capable(net->user_ns, CAP_NET_RAW))
310 goto out_rcu_unlock;
311
312 sock->ops = answer->ops;
313 answer_prot = answer->prot;
314 answer_flags = answer->flags;
315 rcu_read_unlock();
316
317 WARN_ON(!answer_prot->slab);
318
319 err = -ENOBUFS;
320 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
321 if (!sk)
322 goto out;
323
324 err = 0;
325 if (INET_PROTOSW_REUSE & answer_flags)
326 sk->sk_reuse = SK_CAN_REUSE;
327
328 inet = inet_sk(sk);
329 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
330
331 inet->nodefrag = 0;
332
333 if (SOCK_RAW == sock->type) {
334 inet->inet_num = protocol;
335 if (IPPROTO_RAW == protocol)
336 inet->hdrincl = 1;
337 }
338
339 if (net->ipv4.sysctl_ip_no_pmtu_disc)
340 inet->pmtudisc = IP_PMTUDISC_DONT;
341 else
342 inet->pmtudisc = IP_PMTUDISC_WANT;
343
344 inet->inet_id = 0;
345
346 sock_init_data(sock, sk);
347
348 sk->sk_destruct = inet_sock_destruct;
349 sk->sk_protocol = protocol;
350 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
351
352 inet->uc_ttl = -1;
353 inet->mc_loop = 1;
354 inet->mc_ttl = 1;
355 inet->mc_all = 1;
356 inet->mc_index = 0;
357 inet->mc_list = NULL;
358 inet->rcv_tos = 0;
359
360 sk_refcnt_debug_inc(sk);
361
362 if (inet->inet_num) {
363 /* It assumes that any protocol which allows
364 * the user to assign a number at socket
365 * creation time automatically
366 * shares.
367 */
368 inet->inet_sport = htons(inet->inet_num);
369 /* Add to protocol hash chains. */
370 err = sk->sk_prot->hash(sk);
371 if (err) {
372 sk_common_release(sk);
373 goto out;
374 }
375 }
376
377 if (sk->sk_prot->init) {
378 err = sk->sk_prot->init(sk);
379 if (err) {
380 sk_common_release(sk);
381 goto out;
382 }
383 }
384
385 if (!kern) {
386 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
387 if (err) {
388 sk_common_release(sk);
389 goto out;
390 }
391 }
392out:
393 return err;
394out_rcu_unlock:
395 rcu_read_unlock();
396 goto out;
397}
398
399
400/*
401 * The peer socket should always be NULL (or else). When we call this
402 * function we are destroying the object and from then on nobody
403 * should refer to it.
404 */
405int inet_release(struct socket *sock)
406{
407 struct sock *sk = sock->sk;
408
409 if (sk) {
410 long timeout;
411
412 /* Applications forget to leave groups before exiting */
413 ip_mc_drop_socket(sk);
414
415 /* If linger is set, we don't return until the close
416 * is complete. Otherwise we return immediately. The
417 * actually closing is done the same either way.
418 *
419 * If the close is due to the process exiting, we never
420 * linger..
421 */
422 timeout = 0;
423 if (sock_flag(sk, SOCK_LINGER) &&
424 !(current->flags & PF_EXITING))
425 timeout = sk->sk_lingertime;
426 sock->sk = NULL;
427 sk->sk_prot->close(sk, timeout);
428 }
429 return 0;
430}
431EXPORT_SYMBOL(inet_release);
432
433int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
434{
435 struct sock *sk = sock->sk;
436 int err;
437
438 /* If the socket has its own bind function then use it. (RAW) */
439 if (sk->sk_prot->bind) {
440 return sk->sk_prot->bind(sk, uaddr, addr_len);
441 }
442 if (addr_len < sizeof(struct sockaddr_in))
443 return -EINVAL;
444
445 /* BPF prog is run before any checks are done so that if the prog
446 * changes context in a wrong way it will be caught.
447 */
448 err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr);
449 if (err)
450 return err;
451
452 return __inet_bind(sk, uaddr, addr_len, false, true);
453}
454EXPORT_SYMBOL(inet_bind);
455
456int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
457 bool force_bind_address_no_port, bool with_lock)
458{
459 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
460 struct inet_sock *inet = inet_sk(sk);
461 struct net *net = sock_net(sk);
462 unsigned short snum;
463 int chk_addr_ret;
464 u32 tb_id = RT_TABLE_LOCAL;
465 int err;
466
467 if (addr->sin_family != AF_INET) {
468 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
469 * only if s_addr is INADDR_ANY.
470 */
471 err = -EAFNOSUPPORT;
472 if (addr->sin_family != AF_UNSPEC ||
473 addr->sin_addr.s_addr != htonl(INADDR_ANY))
474 goto out;
475 }
476
477 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
478 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
479
480 /* Not specified by any standard per-se, however it breaks too
481 * many applications when removed. It is unfortunate since
482 * allowing applications to make a non-local bind solves
483 * several problems with systems using dynamic addressing.
484 * (ie. your servers still start up even if your ISDN link
485 * is temporarily down)
486 */
487 err = -EADDRNOTAVAIL;
488 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
489 !(inet->freebind || inet->transparent) &&
490 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
491 chk_addr_ret != RTN_LOCAL &&
492 chk_addr_ret != RTN_MULTICAST &&
493 chk_addr_ret != RTN_BROADCAST)
494 goto out;
495
496 snum = ntohs(addr->sin_port);
497 err = -EACCES;
498 if (snum && snum < inet_prot_sock(net) &&
499 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
500 goto out;
501
502 /* We keep a pair of addresses. rcv_saddr is the one
503 * used by hash lookups, and saddr is used for transmit.
504 *
505 * In the BSD API these are the same except where it
506 * would be illegal to use them (multicast/broadcast) in
507 * which case the sending device address is used.
508 */
509 if (with_lock)
510 lock_sock(sk);
511
512 /* Check these errors (active socket, double bind). */
513 err = -EINVAL;
514 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
515 goto out_release_sock;
516
517 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
518 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
519 inet->inet_saddr = 0; /* Use device */
520
521 /* Make sure we are allowed to bind here. */
522 if (snum || !(inet->bind_address_no_port ||
523 force_bind_address_no_port)) {
524 if (sk->sk_prot->get_port(sk, snum)) {
525 inet->inet_saddr = inet->inet_rcv_saddr = 0;
526 err = -EADDRINUSE;
527 goto out_release_sock;
528 }
529 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
530 if (err) {
531 inet->inet_saddr = inet->inet_rcv_saddr = 0;
532 goto out_release_sock;
533 }
534 }
535
536 if (inet->inet_rcv_saddr)
537 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
538 if (snum)
539 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
540 inet->inet_sport = htons(inet->inet_num);
541 inet->inet_daddr = 0;
542 inet->inet_dport = 0;
543 sk_dst_reset(sk);
544 err = 0;
545out_release_sock:
546 if (with_lock)
547 release_sock(sk);
548out:
549 return err;
550}
551
552int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
553 int addr_len, int flags)
554{
555 struct sock *sk = sock->sk;
556 int err;
557
558 if (addr_len < sizeof(uaddr->sa_family))
559 return -EINVAL;
560 if (uaddr->sa_family == AF_UNSPEC)
561 return sk->sk_prot->disconnect(sk, flags);
562
563 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
564 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
565 if (err)
566 return err;
567 }
568
569 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
570 return -EAGAIN;
571 return sk->sk_prot->connect(sk, uaddr, addr_len);
572}
573EXPORT_SYMBOL(inet_dgram_connect);
574
575static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
576{
577 DEFINE_WAIT_FUNC(wait, woken_wake_function);
578
579 add_wait_queue(sk_sleep(sk), &wait);
580 sk->sk_write_pending += writebias;
581
582 /* Basic assumption: if someone sets sk->sk_err, he _must_
583 * change state of the socket from TCP_SYN_*.
584 * Connect() does not allow to get error notifications
585 * without closing the socket.
586 */
587 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
588 release_sock(sk);
589 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
590 lock_sock(sk);
591 if (signal_pending(current) || !timeo)
592 break;
593 }
594 remove_wait_queue(sk_sleep(sk), &wait);
595 sk->sk_write_pending -= writebias;
596 return timeo;
597}
598
599/*
600 * Connect to a remote host. There is regrettably still a little
601 * TCP 'magic' in here.
602 */
603int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
604 int addr_len, int flags, int is_sendmsg)
605{
606 struct sock *sk = sock->sk;
607 int err;
608 long timeo;
609
610 /*
611 * uaddr can be NULL and addr_len can be 0 if:
612 * sk is a TCP fastopen active socket and
613 * TCP_FASTOPEN_CONNECT sockopt is set and
614 * we already have a valid cookie for this socket.
615 * In this case, user can call write() after connect().
616 * write() will invoke tcp_sendmsg_fastopen() which calls
617 * __inet_stream_connect().
618 */
619 if (uaddr) {
620 if (addr_len < sizeof(uaddr->sa_family))
621 return -EINVAL;
622
623 if (uaddr->sa_family == AF_UNSPEC) {
624 err = sk->sk_prot->disconnect(sk, flags);
625 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
626 goto out;
627 }
628 }
629
630 switch (sock->state) {
631 default:
632 err = -EINVAL;
633 goto out;
634 case SS_CONNECTED:
635 err = -EISCONN;
636 goto out;
637 case SS_CONNECTING:
638 if (inet_sk(sk)->defer_connect)
639 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
640 else
641 err = -EALREADY;
642 /* Fall out of switch with err, set for this state */
643 break;
644 case SS_UNCONNECTED:
645 err = -EISCONN;
646 if (sk->sk_state != TCP_CLOSE)
647 goto out;
648
649 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
650 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
651 if (err)
652 goto out;
653 }
654
655 err = sk->sk_prot->connect(sk, uaddr, addr_len);
656 if (err < 0)
657 goto out;
658
659 sock->state = SS_CONNECTING;
660
661 if (!err && inet_sk(sk)->defer_connect)
662 goto out;
663
664 /* Just entered SS_CONNECTING state; the only
665 * difference is that return value in non-blocking
666 * case is EINPROGRESS, rather than EALREADY.
667 */
668 err = -EINPROGRESS;
669 break;
670 }
671
672 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
673
674 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
675 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
676 tcp_sk(sk)->fastopen_req &&
677 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
678
679 /* Error code is set above */
680 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
681 goto out;
682
683 err = sock_intr_errno(timeo);
684 if (signal_pending(current))
685 goto out;
686 }
687
688 /* Connection was closed by RST, timeout, ICMP error
689 * or another process disconnected us.
690 */
691 if (sk->sk_state == TCP_CLOSE)
692 goto sock_error;
693
694 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
695 * and error was received after socket entered established state.
696 * Hence, it is handled normally after connect() return successfully.
697 */
698
699 sock->state = SS_CONNECTED;
700 err = 0;
701out:
702 return err;
703
704sock_error:
705 err = sock_error(sk) ? : -ECONNABORTED;
706 sock->state = SS_UNCONNECTED;
707 if (sk->sk_prot->disconnect(sk, flags))
708 sock->state = SS_DISCONNECTING;
709 goto out;
710}
711EXPORT_SYMBOL(__inet_stream_connect);
712
713int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
714 int addr_len, int flags)
715{
716 int err;
717
718 lock_sock(sock->sk);
719 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
720 release_sock(sock->sk);
721 return err;
722}
723EXPORT_SYMBOL(inet_stream_connect);
724
725/*
726 * Accept a pending connection. The TCP layer now gives BSD semantics.
727 */
728
729int inet_accept(struct socket *sock, struct socket *newsock, int flags,
730 bool kern)
731{
732 struct sock *sk1 = sock->sk;
733 int err = -EINVAL;
734 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
735
736 if (!sk2)
737 goto do_err;
738
739 lock_sock(sk2);
740
741 sock_rps_record_flow(sk2);
742 WARN_ON(!((1 << sk2->sk_state) &
743 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
744 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
745
746 sock_graft(sk2, newsock);
747
748 newsock->state = SS_CONNECTED;
749 err = 0;
750 release_sock(sk2);
751do_err:
752 return err;
753}
754EXPORT_SYMBOL(inet_accept);
755
756
757/*
758 * This does both peername and sockname.
759 */
760int inet_getname(struct socket *sock, struct sockaddr *uaddr,
761 int peer)
762{
763 struct sock *sk = sock->sk;
764 struct inet_sock *inet = inet_sk(sk);
765 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
766
767 sin->sin_family = AF_INET;
768 if (peer) {
769 if (!inet->inet_dport ||
770 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
771 peer == 1))
772 return -ENOTCONN;
773 sin->sin_port = inet->inet_dport;
774 sin->sin_addr.s_addr = inet->inet_daddr;
775 } else {
776 __be32 addr = inet->inet_rcv_saddr;
777 if (!addr)
778 addr = inet->inet_saddr;
779 sin->sin_port = inet->inet_sport;
780 sin->sin_addr.s_addr = addr;
781 }
782 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
783 return sizeof(*sin);
784}
785EXPORT_SYMBOL(inet_getname);
786
787int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
788{
789 struct sock *sk = sock->sk;
790
791 sock_rps_record_flow(sk);
792
793 /* We may need to bind the socket. */
794 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
795 inet_autobind(sk))
796 return -EAGAIN;
797
798 return sk->sk_prot->sendmsg(sk, msg, size);
799}
800EXPORT_SYMBOL(inet_sendmsg);
801
802ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
803 size_t size, int flags)
804{
805 struct sock *sk = sock->sk;
806
807 sock_rps_record_flow(sk);
808
809 /* We may need to bind the socket. */
810 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
811 inet_autobind(sk))
812 return -EAGAIN;
813
814 if (sk->sk_prot->sendpage)
815 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
816 return sock_no_sendpage(sock, page, offset, size, flags);
817}
818EXPORT_SYMBOL(inet_sendpage);
819
820int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
821 int flags)
822{
823 struct sock *sk = sock->sk;
824 int addr_len = 0;
825 int err;
826
827 if (likely(!(flags & MSG_ERRQUEUE)))
828 sock_rps_record_flow(sk);
829
830 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
831 flags & ~MSG_DONTWAIT, &addr_len);
832 if (err >= 0)
833 msg->msg_namelen = addr_len;
834 return err;
835}
836EXPORT_SYMBOL(inet_recvmsg);
837
838int inet_shutdown(struct socket *sock, int how)
839{
840 struct sock *sk = sock->sk;
841 int err = 0;
842
843 /* This should really check to make sure
844 * the socket is a TCP socket. (WHY AC...)
845 */
846 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
847 1->2 bit 2 snds.
848 2->3 */
849 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
850 return -EINVAL;
851
852 lock_sock(sk);
853 if (sock->state == SS_CONNECTING) {
854 if ((1 << sk->sk_state) &
855 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
856 sock->state = SS_DISCONNECTING;
857 else
858 sock->state = SS_CONNECTED;
859 }
860
861 switch (sk->sk_state) {
862 case TCP_CLOSE:
863 err = -ENOTCONN;
864 /* Hack to wake up other listeners, who can poll for
865 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
866 /* fall through */
867 default:
868 sk->sk_shutdown |= how;
869 if (sk->sk_prot->shutdown)
870 sk->sk_prot->shutdown(sk, how);
871 break;
872
873 /* Remaining two branches are temporary solution for missing
874 * close() in multithreaded environment. It is _not_ a good idea,
875 * but we have no choice until close() is repaired at VFS level.
876 */
877 case TCP_LISTEN:
878 if (!(how & RCV_SHUTDOWN))
879 break;
880 /* fall through */
881 case TCP_SYN_SENT:
882 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
883 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
884 break;
885 }
886
887 /* Wake up anyone sleeping in poll. */
888 sk->sk_state_change(sk);
889 release_sock(sk);
890 return err;
891}
892EXPORT_SYMBOL(inet_shutdown);
893
894/*
895 * ioctl() calls you can issue on an INET socket. Most of these are
896 * device configuration and stuff and very rarely used. Some ioctls
897 * pass on to the socket itself.
898 *
899 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
900 * loads the devconfigure module does its configuring and unloads it.
901 * There's a good 20K of config code hanging around the kernel.
902 */
903
904int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
905{
906 struct sock *sk = sock->sk;
907 int err = 0;
908 struct net *net = sock_net(sk);
909 void __user *p = (void __user *)arg;
910 struct ifreq ifr;
911 struct rtentry rt;
912
913 switch (cmd) {
914 case SIOCGSTAMP:
915 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
916 break;
917 case SIOCGSTAMPNS:
918 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
919 break;
920 case SIOCADDRT:
921 case SIOCDELRT:
922 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
923 return -EFAULT;
924 err = ip_rt_ioctl(net, cmd, &rt);
925 break;
926 case SIOCRTMSG:
927 err = -EINVAL;
928 break;
929 case SIOCDARP:
930 case SIOCGARP:
931 case SIOCSARP:
932 err = arp_ioctl(net, cmd, (void __user *)arg);
933 break;
934 case SIOCGIFADDR:
935 case SIOCGIFBRDADDR:
936 case SIOCGIFNETMASK:
937 case SIOCGIFDSTADDR:
938 case SIOCGIFPFLAGS:
939 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
940 return -EFAULT;
941 err = devinet_ioctl(net, cmd, &ifr);
942 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
943 err = -EFAULT;
944 break;
945
946 case SIOCSIFADDR:
947 case SIOCSIFBRDADDR:
948 case SIOCSIFNETMASK:
949 case SIOCSIFDSTADDR:
950 case SIOCSIFPFLAGS:
951 case SIOCSIFFLAGS:
952 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
953 return -EFAULT;
954 err = devinet_ioctl(net, cmd, &ifr);
955 break;
956 default:
957 if (sk->sk_prot->ioctl)
958 err = sk->sk_prot->ioctl(sk, cmd, arg);
959 else
960 err = -ENOIOCTLCMD;
961 break;
962 }
963 return err;
964}
965EXPORT_SYMBOL(inet_ioctl);
966
967#ifdef CONFIG_COMPAT
968static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
969{
970 struct sock *sk = sock->sk;
971 int err = -ENOIOCTLCMD;
972
973 if (sk->sk_prot->compat_ioctl)
974 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
975
976 return err;
977}
978#endif
979
980const struct proto_ops inet_stream_ops = {
981 .family = PF_INET,
982 .owner = THIS_MODULE,
983 .release = inet_release,
984 .bind = inet_bind,
985 .connect = inet_stream_connect,
986 .socketpair = sock_no_socketpair,
987 .accept = inet_accept,
988 .getname = inet_getname,
989 .poll = tcp_poll,
990 .ioctl = inet_ioctl,
991 .listen = inet_listen,
992 .shutdown = inet_shutdown,
993 .setsockopt = sock_common_setsockopt,
994 .getsockopt = sock_common_getsockopt,
995 .sendmsg = inet_sendmsg,
996 .recvmsg = inet_recvmsg,
997 .mmap = sock_no_mmap,
998 .sendpage = inet_sendpage,
999 .splice_read = tcp_splice_read,
1000 .read_sock = tcp_read_sock,
1001 .sendmsg_locked = tcp_sendmsg_locked,
1002 .sendpage_locked = tcp_sendpage_locked,
1003 .peek_len = tcp_peek_len,
1004#ifdef CONFIG_COMPAT
1005 .compat_setsockopt = compat_sock_common_setsockopt,
1006 .compat_getsockopt = compat_sock_common_getsockopt,
1007 .compat_ioctl = inet_compat_ioctl,
1008#endif
1009};
1010EXPORT_SYMBOL(inet_stream_ops);
1011
1012const struct proto_ops inet_dgram_ops = {
1013 .family = PF_INET,
1014 .owner = THIS_MODULE,
1015 .release = inet_release,
1016 .bind = inet_bind,
1017 .connect = inet_dgram_connect,
1018 .socketpair = sock_no_socketpair,
1019 .accept = sock_no_accept,
1020 .getname = inet_getname,
1021 .poll = udp_poll,
1022 .ioctl = inet_ioctl,
1023 .listen = sock_no_listen,
1024 .shutdown = inet_shutdown,
1025 .setsockopt = sock_common_setsockopt,
1026 .getsockopt = sock_common_getsockopt,
1027 .sendmsg = inet_sendmsg,
1028 .recvmsg = inet_recvmsg,
1029 .mmap = sock_no_mmap,
1030 .sendpage = inet_sendpage,
1031 .set_peek_off = sk_set_peek_off,
1032#ifdef CONFIG_COMPAT
1033 .compat_setsockopt = compat_sock_common_setsockopt,
1034 .compat_getsockopt = compat_sock_common_getsockopt,
1035 .compat_ioctl = inet_compat_ioctl,
1036#endif
1037};
1038EXPORT_SYMBOL(inet_dgram_ops);
1039
1040/*
1041 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1042 * udp_poll
1043 */
1044static const struct proto_ops inet_sockraw_ops = {
1045 .family = PF_INET,
1046 .owner = THIS_MODULE,
1047 .release = inet_release,
1048 .bind = inet_bind,
1049 .connect = inet_dgram_connect,
1050 .socketpair = sock_no_socketpair,
1051 .accept = sock_no_accept,
1052 .getname = inet_getname,
1053 .poll = datagram_poll,
1054 .ioctl = inet_ioctl,
1055 .listen = sock_no_listen,
1056 .shutdown = inet_shutdown,
1057 .setsockopt = sock_common_setsockopt,
1058 .getsockopt = sock_common_getsockopt,
1059 .sendmsg = inet_sendmsg,
1060 .recvmsg = inet_recvmsg,
1061 .mmap = sock_no_mmap,
1062 .sendpage = inet_sendpage,
1063#ifdef CONFIG_COMPAT
1064 .compat_setsockopt = compat_sock_common_setsockopt,
1065 .compat_getsockopt = compat_sock_common_getsockopt,
1066 .compat_ioctl = inet_compat_ioctl,
1067#endif
1068};
1069
1070static const struct net_proto_family inet_family_ops = {
1071 .family = PF_INET,
1072 .create = inet_create,
1073 .owner = THIS_MODULE,
1074};
1075
1076/* Upon startup we insert all the elements in inetsw_array[] into
1077 * the linked list inetsw.
1078 */
1079static struct inet_protosw inetsw_array[] =
1080{
1081 {
1082 .type = SOCK_STREAM,
1083 .protocol = IPPROTO_TCP,
1084 .prot = &tcp_prot,
1085 .ops = &inet_stream_ops,
1086 .flags = INET_PROTOSW_PERMANENT |
1087 INET_PROTOSW_ICSK,
1088 },
1089
1090 {
1091 .type = SOCK_DGRAM,
1092 .protocol = IPPROTO_UDP,
1093 .prot = &udp_prot,
1094 .ops = &inet_dgram_ops,
1095 .flags = INET_PROTOSW_PERMANENT,
1096 },
1097
1098 {
1099 .type = SOCK_DGRAM,
1100 .protocol = IPPROTO_ICMP,
1101 .prot = &ping_prot,
1102 .ops = &inet_sockraw_ops,
1103 .flags = INET_PROTOSW_REUSE,
1104 },
1105
1106 {
1107 .type = SOCK_RAW,
1108 .protocol = IPPROTO_IP, /* wild card */
1109 .prot = &raw_prot,
1110 .ops = &inet_sockraw_ops,
1111 .flags = INET_PROTOSW_REUSE,
1112 }
1113};
1114
1115#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1116
1117void inet_register_protosw(struct inet_protosw *p)
1118{
1119 struct list_head *lh;
1120 struct inet_protosw *answer;
1121 int protocol = p->protocol;
1122 struct list_head *last_perm;
1123
1124 spin_lock_bh(&inetsw_lock);
1125
1126 if (p->type >= SOCK_MAX)
1127 goto out_illegal;
1128
1129 /* If we are trying to override a permanent protocol, bail. */
1130 last_perm = &inetsw[p->type];
1131 list_for_each(lh, &inetsw[p->type]) {
1132 answer = list_entry(lh, struct inet_protosw, list);
1133 /* Check only the non-wild match. */
1134 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1135 break;
1136 if (protocol == answer->protocol)
1137 goto out_permanent;
1138 last_perm = lh;
1139 }
1140
1141 /* Add the new entry after the last permanent entry if any, so that
1142 * the new entry does not override a permanent entry when matched with
1143 * a wild-card protocol. But it is allowed to override any existing
1144 * non-permanent entry. This means that when we remove this entry, the
1145 * system automatically returns to the old behavior.
1146 */
1147 list_add_rcu(&p->list, last_perm);
1148out:
1149 spin_unlock_bh(&inetsw_lock);
1150
1151 return;
1152
1153out_permanent:
1154 pr_err("Attempt to override permanent protocol %d\n", protocol);
1155 goto out;
1156
1157out_illegal:
1158 pr_err("Ignoring attempt to register invalid socket type %d\n",
1159 p->type);
1160 goto out;
1161}
1162EXPORT_SYMBOL(inet_register_protosw);
1163
1164void inet_unregister_protosw(struct inet_protosw *p)
1165{
1166 if (INET_PROTOSW_PERMANENT & p->flags) {
1167 pr_err("Attempt to unregister permanent protocol %d\n",
1168 p->protocol);
1169 } else {
1170 spin_lock_bh(&inetsw_lock);
1171 list_del_rcu(&p->list);
1172 spin_unlock_bh(&inetsw_lock);
1173
1174 synchronize_net();
1175 }
1176}
1177EXPORT_SYMBOL(inet_unregister_protosw);
1178
1179static int inet_sk_reselect_saddr(struct sock *sk)
1180{
1181 struct inet_sock *inet = inet_sk(sk);
1182 __be32 old_saddr = inet->inet_saddr;
1183 __be32 daddr = inet->inet_daddr;
1184 struct flowi4 *fl4;
1185 struct rtable *rt;
1186 __be32 new_saddr;
1187 struct ip_options_rcu *inet_opt;
1188
1189 inet_opt = rcu_dereference_protected(inet->inet_opt,
1190 lockdep_sock_is_held(sk));
1191 if (inet_opt && inet_opt->opt.srr)
1192 daddr = inet_opt->opt.faddr;
1193
1194 /* Query new route. */
1195 fl4 = &inet->cork.fl.u.ip4;
1196 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1197 sk->sk_bound_dev_if, sk->sk_protocol,
1198 inet->inet_sport, inet->inet_dport, sk);
1199 if (IS_ERR(rt))
1200 return PTR_ERR(rt);
1201
1202 sk_setup_caps(sk, &rt->dst);
1203
1204 new_saddr = fl4->saddr;
1205
1206 if (new_saddr == old_saddr)
1207 return 0;
1208
1209 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1210 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1211 __func__, &old_saddr, &new_saddr);
1212 }
1213
1214 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1215
1216 /*
1217 * XXX The only one ugly spot where we need to
1218 * XXX really change the sockets identity after
1219 * XXX it has entered the hashes. -DaveM
1220 *
1221 * Besides that, it does not check for connection
1222 * uniqueness. Wait for troubles.
1223 */
1224 return __sk_prot_rehash(sk);
1225}
1226
1227int inet_sk_rebuild_header(struct sock *sk)
1228{
1229 struct inet_sock *inet = inet_sk(sk);
1230 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1231 __be32 daddr;
1232 struct ip_options_rcu *inet_opt;
1233 struct flowi4 *fl4;
1234 int err;
1235
1236 /* Route is OK, nothing to do. */
1237 if (rt)
1238 return 0;
1239
1240 /* Reroute. */
1241 rcu_read_lock();
1242 inet_opt = rcu_dereference(inet->inet_opt);
1243 daddr = inet->inet_daddr;
1244 if (inet_opt && inet_opt->opt.srr)
1245 daddr = inet_opt->opt.faddr;
1246 rcu_read_unlock();
1247 fl4 = &inet->cork.fl.u.ip4;
1248 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1249 inet->inet_dport, inet->inet_sport,
1250 sk->sk_protocol, RT_CONN_FLAGS(sk),
1251 sk->sk_bound_dev_if);
1252 if (!IS_ERR(rt)) {
1253 err = 0;
1254 sk_setup_caps(sk, &rt->dst);
1255 } else {
1256 err = PTR_ERR(rt);
1257
1258 /* Routing failed... */
1259 sk->sk_route_caps = 0;
1260 /*
1261 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1262 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1263 */
1264 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1265 sk->sk_state != TCP_SYN_SENT ||
1266 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1267 (err = inet_sk_reselect_saddr(sk)) != 0)
1268 sk->sk_err_soft = -err;
1269 }
1270
1271 return err;
1272}
1273EXPORT_SYMBOL(inet_sk_rebuild_header);
1274
1275void inet_sk_set_state(struct sock *sk, int state)
1276{
1277 trace_inet_sock_set_state(sk, sk->sk_state, state);
1278 sk->sk_state = state;
1279}
1280EXPORT_SYMBOL(inet_sk_set_state);
1281
1282void inet_sk_state_store(struct sock *sk, int newstate)
1283{
1284 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1285 smp_store_release(&sk->sk_state, newstate);
1286}
1287
1288struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1289 netdev_features_t features)
1290{
1291 bool udpfrag = false, fixedid = false, gso_partial, encap;
1292 struct sk_buff *segs = ERR_PTR(-EINVAL);
1293 const struct net_offload *ops;
1294 unsigned int offset = 0;
1295 struct iphdr *iph;
1296 int proto, tot_len;
1297 int nhoff;
1298 int ihl;
1299 int id;
1300
1301 skb_reset_network_header(skb);
1302 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1303 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1304 goto out;
1305
1306 iph = ip_hdr(skb);
1307 ihl = iph->ihl * 4;
1308 if (ihl < sizeof(*iph))
1309 goto out;
1310
1311 id = ntohs(iph->id);
1312 proto = iph->protocol;
1313
1314 /* Warning: after this point, iph might be no longer valid */
1315 if (unlikely(!pskb_may_pull(skb, ihl)))
1316 goto out;
1317 __skb_pull(skb, ihl);
1318
1319 encap = SKB_GSO_CB(skb)->encap_level > 0;
1320 if (encap)
1321 features &= skb->dev->hw_enc_features;
1322 SKB_GSO_CB(skb)->encap_level += ihl;
1323
1324 skb_reset_transport_header(skb);
1325
1326 segs = ERR_PTR(-EPROTONOSUPPORT);
1327
1328 if (!skb->encapsulation || encap) {
1329 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1330 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1331
1332 /* fixed ID is invalid if DF bit is not set */
1333 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1334 goto out;
1335 }
1336
1337 ops = rcu_dereference(inet_offloads[proto]);
1338 if (likely(ops && ops->callbacks.gso_segment))
1339 segs = ops->callbacks.gso_segment(skb, features);
1340
1341 if (IS_ERR_OR_NULL(segs))
1342 goto out;
1343
1344 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1345
1346 skb = segs;
1347 do {
1348 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1349 if (udpfrag) {
1350 iph->frag_off = htons(offset >> 3);
1351 if (skb->next)
1352 iph->frag_off |= htons(IP_MF);
1353 offset += skb->len - nhoff - ihl;
1354 tot_len = skb->len - nhoff;
1355 } else if (skb_is_gso(skb)) {
1356 if (!fixedid) {
1357 iph->id = htons(id);
1358 id += skb_shinfo(skb)->gso_segs;
1359 }
1360
1361 if (gso_partial)
1362 tot_len = skb_shinfo(skb)->gso_size +
1363 SKB_GSO_CB(skb)->data_offset +
1364 skb->head - (unsigned char *)iph;
1365 else
1366 tot_len = skb->len - nhoff;
1367 } else {
1368 if (!fixedid)
1369 iph->id = htons(id++);
1370 tot_len = skb->len - nhoff;
1371 }
1372 iph->tot_len = htons(tot_len);
1373 ip_send_check(iph);
1374 if (encap)
1375 skb_reset_inner_headers(skb);
1376 skb->network_header = (u8 *)iph - skb->head;
1377 } while ((skb = skb->next));
1378
1379out:
1380 return segs;
1381}
1382EXPORT_SYMBOL(inet_gso_segment);
1383
1384struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb)
1385{
1386 const struct net_offload *ops;
1387 struct sk_buff **pp = NULL;
1388 struct sk_buff *p;
1389 const struct iphdr *iph;
1390 unsigned int hlen;
1391 unsigned int off;
1392 unsigned int id;
1393 int flush = 1;
1394 int proto;
1395
1396 off = skb_gro_offset(skb);
1397 hlen = off + sizeof(*iph);
1398 iph = skb_gro_header_fast(skb, off);
1399 if (skb_gro_header_hard(skb, hlen)) {
1400 iph = skb_gro_header_slow(skb, hlen, off);
1401 if (unlikely(!iph))
1402 goto out;
1403 }
1404
1405 proto = iph->protocol;
1406
1407 rcu_read_lock();
1408 ops = rcu_dereference(inet_offloads[proto]);
1409 if (!ops || !ops->callbacks.gro_receive)
1410 goto out_unlock;
1411
1412 if (*(u8 *)iph != 0x45)
1413 goto out_unlock;
1414
1415 if (ip_is_fragment(iph))
1416 goto out_unlock;
1417
1418 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1419 goto out_unlock;
1420
1421 id = ntohl(*(__be32 *)&iph->id);
1422 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1423 id >>= 16;
1424
1425 for (p = *head; p; p = p->next) {
1426 struct iphdr *iph2;
1427 u16 flush_id;
1428
1429 if (!NAPI_GRO_CB(p)->same_flow)
1430 continue;
1431
1432 iph2 = (struct iphdr *)(p->data + off);
1433 /* The above works because, with the exception of the top
1434 * (inner most) layer, we only aggregate pkts with the same
1435 * hdr length so all the hdrs we'll need to verify will start
1436 * at the same offset.
1437 */
1438 if ((iph->protocol ^ iph2->protocol) |
1439 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1440 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1441 NAPI_GRO_CB(p)->same_flow = 0;
1442 continue;
1443 }
1444
1445 /* All fields must match except length and checksum. */
1446 NAPI_GRO_CB(p)->flush |=
1447 (iph->ttl ^ iph2->ttl) |
1448 (iph->tos ^ iph2->tos) |
1449 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1450
1451 NAPI_GRO_CB(p)->flush |= flush;
1452
1453 /* We need to store of the IP ID check to be included later
1454 * when we can verify that this packet does in fact belong
1455 * to a given flow.
1456 */
1457 flush_id = (u16)(id - ntohs(iph2->id));
1458
1459 /* This bit of code makes it much easier for us to identify
1460 * the cases where we are doing atomic vs non-atomic IP ID
1461 * checks. Specifically an atomic check can return IP ID
1462 * values 0 - 0xFFFF, while a non-atomic check can only
1463 * return 0 or 0xFFFF.
1464 */
1465 if (!NAPI_GRO_CB(p)->is_atomic ||
1466 !(iph->frag_off & htons(IP_DF))) {
1467 flush_id ^= NAPI_GRO_CB(p)->count;
1468 flush_id = flush_id ? 0xFFFF : 0;
1469 }
1470
1471 /* If the previous IP ID value was based on an atomic
1472 * datagram we can overwrite the value and ignore it.
1473 */
1474 if (NAPI_GRO_CB(skb)->is_atomic)
1475 NAPI_GRO_CB(p)->flush_id = flush_id;
1476 else
1477 NAPI_GRO_CB(p)->flush_id |= flush_id;
1478 }
1479
1480 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1481 NAPI_GRO_CB(skb)->flush |= flush;
1482 skb_set_network_header(skb, off);
1483 /* The above will be needed by the transport layer if there is one
1484 * immediately following this IP hdr.
1485 */
1486
1487 /* Note : No need to call skb_gro_postpull_rcsum() here,
1488 * as we already checked checksum over ipv4 header was 0
1489 */
1490 skb_gro_pull(skb, sizeof(*iph));
1491 skb_set_transport_header(skb, skb_gro_offset(skb));
1492
1493 pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
1494
1495out_unlock:
1496 rcu_read_unlock();
1497
1498out:
1499 skb_gro_flush_final(skb, pp, flush);
1500
1501 return pp;
1502}
1503EXPORT_SYMBOL(inet_gro_receive);
1504
1505static struct sk_buff **ipip_gro_receive(struct sk_buff **head,
1506 struct sk_buff *skb)
1507{
1508 if (NAPI_GRO_CB(skb)->encap_mark) {
1509 NAPI_GRO_CB(skb)->flush = 1;
1510 return NULL;
1511 }
1512
1513 NAPI_GRO_CB(skb)->encap_mark = 1;
1514
1515 return inet_gro_receive(head, skb);
1516}
1517
1518#define SECONDS_PER_DAY 86400
1519
1520/* inet_current_timestamp - Return IP network timestamp
1521 *
1522 * Return milliseconds since midnight in network byte order.
1523 */
1524__be32 inet_current_timestamp(void)
1525{
1526 u32 secs;
1527 u32 msecs;
1528 struct timespec64 ts;
1529
1530 ktime_get_real_ts64(&ts);
1531
1532 /* Get secs since midnight. */
1533 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1534 /* Convert to msecs. */
1535 msecs = secs * MSEC_PER_SEC;
1536 /* Convert nsec to msec. */
1537 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1538
1539 /* Convert to network byte order. */
1540 return htonl(msecs);
1541}
1542EXPORT_SYMBOL(inet_current_timestamp);
1543
1544int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1545{
1546 if (sk->sk_family == AF_INET)
1547 return ip_recv_error(sk, msg, len, addr_len);
1548#if IS_ENABLED(CONFIG_IPV6)
1549 if (sk->sk_family == AF_INET6)
1550 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1551#endif
1552 return -EINVAL;
1553}
1554
1555int inet_gro_complete(struct sk_buff *skb, int nhoff)
1556{
1557 __be16 newlen = htons(skb->len - nhoff);
1558 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1559 const struct net_offload *ops;
1560 int proto = iph->protocol;
1561 int err = -ENOSYS;
1562
1563 if (skb->encapsulation) {
1564 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1565 skb_set_inner_network_header(skb, nhoff);
1566 }
1567
1568 csum_replace2(&iph->check, iph->tot_len, newlen);
1569 iph->tot_len = newlen;
1570
1571 rcu_read_lock();
1572 ops = rcu_dereference(inet_offloads[proto]);
1573 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1574 goto out_unlock;
1575
1576 /* Only need to add sizeof(*iph) to get to the next hdr below
1577 * because any hdr with option will have been flushed in
1578 * inet_gro_receive().
1579 */
1580 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1581
1582out_unlock:
1583 rcu_read_unlock();
1584
1585 return err;
1586}
1587EXPORT_SYMBOL(inet_gro_complete);
1588
1589static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1590{
1591 skb->encapsulation = 1;
1592 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1593 return inet_gro_complete(skb, nhoff);
1594}
1595
1596int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1597 unsigned short type, unsigned char protocol,
1598 struct net *net)
1599{
1600 struct socket *sock;
1601 int rc = sock_create_kern(net, family, type, protocol, &sock);
1602
1603 if (rc == 0) {
1604 *sk = sock->sk;
1605 (*sk)->sk_allocation = GFP_ATOMIC;
1606 /*
1607 * Unhash it so that IP input processing does not even see it,
1608 * we do not wish this socket to see incoming packets.
1609 */
1610 (*sk)->sk_prot->unhash(*sk);
1611 }
1612 return rc;
1613}
1614EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1615
1616u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1617{
1618 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1619}
1620EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1621
1622unsigned long snmp_fold_field(void __percpu *mib, int offt)
1623{
1624 unsigned long res = 0;
1625 int i;
1626
1627 for_each_possible_cpu(i)
1628 res += snmp_get_cpu_field(mib, i, offt);
1629 return res;
1630}
1631EXPORT_SYMBOL_GPL(snmp_fold_field);
1632
1633#if BITS_PER_LONG==32
1634
1635u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1636 size_t syncp_offset)
1637{
1638 void *bhptr;
1639 struct u64_stats_sync *syncp;
1640 u64 v;
1641 unsigned int start;
1642
1643 bhptr = per_cpu_ptr(mib, cpu);
1644 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1645 do {
1646 start = u64_stats_fetch_begin_irq(syncp);
1647 v = *(((u64 *)bhptr) + offt);
1648 } while (u64_stats_fetch_retry_irq(syncp, start));
1649
1650 return v;
1651}
1652EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1653
1654u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1655{
1656 u64 res = 0;
1657 int cpu;
1658
1659 for_each_possible_cpu(cpu) {
1660 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1661 }
1662 return res;
1663}
1664EXPORT_SYMBOL_GPL(snmp_fold_field64);
1665#endif
1666
1667#ifdef CONFIG_IP_MULTICAST
1668static const struct net_protocol igmp_protocol = {
1669 .handler = igmp_rcv,
1670 .netns_ok = 1,
1671};
1672#endif
1673
1674/* thinking of making this const? Don't.
1675 * early_demux can change based on sysctl.
1676 */
1677static struct net_protocol tcp_protocol = {
1678 .early_demux = tcp_v4_early_demux,
1679 .early_demux_handler = tcp_v4_early_demux,
1680 .handler = tcp_v4_rcv,
1681 .err_handler = tcp_v4_err,
1682 .no_policy = 1,
1683 .netns_ok = 1,
1684 .icmp_strict_tag_validation = 1,
1685};
1686
1687/* thinking of making this const? Don't.
1688 * early_demux can change based on sysctl.
1689 */
1690static struct net_protocol udp_protocol = {
1691 .early_demux = udp_v4_early_demux,
1692 .early_demux_handler = udp_v4_early_demux,
1693 .handler = udp_rcv,
1694 .err_handler = udp_err,
1695 .no_policy = 1,
1696 .netns_ok = 1,
1697};
1698
1699static const struct net_protocol icmp_protocol = {
1700 .handler = icmp_rcv,
1701 .err_handler = icmp_err,
1702 .no_policy = 1,
1703 .netns_ok = 1,
1704};
1705
1706static __net_init int ipv4_mib_init_net(struct net *net)
1707{
1708 int i;
1709
1710 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1711 if (!net->mib.tcp_statistics)
1712 goto err_tcp_mib;
1713 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1714 if (!net->mib.ip_statistics)
1715 goto err_ip_mib;
1716
1717 for_each_possible_cpu(i) {
1718 struct ipstats_mib *af_inet_stats;
1719 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1720 u64_stats_init(&af_inet_stats->syncp);
1721 }
1722
1723 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1724 if (!net->mib.net_statistics)
1725 goto err_net_mib;
1726 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1727 if (!net->mib.udp_statistics)
1728 goto err_udp_mib;
1729 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1730 if (!net->mib.udplite_statistics)
1731 goto err_udplite_mib;
1732 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1733 if (!net->mib.icmp_statistics)
1734 goto err_icmp_mib;
1735 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1736 GFP_KERNEL);
1737 if (!net->mib.icmpmsg_statistics)
1738 goto err_icmpmsg_mib;
1739
1740 tcp_mib_init(net);
1741 return 0;
1742
1743err_icmpmsg_mib:
1744 free_percpu(net->mib.icmp_statistics);
1745err_icmp_mib:
1746 free_percpu(net->mib.udplite_statistics);
1747err_udplite_mib:
1748 free_percpu(net->mib.udp_statistics);
1749err_udp_mib:
1750 free_percpu(net->mib.net_statistics);
1751err_net_mib:
1752 free_percpu(net->mib.ip_statistics);
1753err_ip_mib:
1754 free_percpu(net->mib.tcp_statistics);
1755err_tcp_mib:
1756 return -ENOMEM;
1757}
1758
1759static __net_exit void ipv4_mib_exit_net(struct net *net)
1760{
1761 kfree(net->mib.icmpmsg_statistics);
1762 free_percpu(net->mib.icmp_statistics);
1763 free_percpu(net->mib.udplite_statistics);
1764 free_percpu(net->mib.udp_statistics);
1765 free_percpu(net->mib.net_statistics);
1766 free_percpu(net->mib.ip_statistics);
1767 free_percpu(net->mib.tcp_statistics);
1768}
1769
1770static __net_initdata struct pernet_operations ipv4_mib_ops = {
1771 .init = ipv4_mib_init_net,
1772 .exit = ipv4_mib_exit_net,
1773};
1774
1775static int __init init_ipv4_mibs(void)
1776{
1777 return register_pernet_subsys(&ipv4_mib_ops);
1778}
1779
1780static __net_init int inet_init_net(struct net *net)
1781{
1782 /*
1783 * Set defaults for local port range
1784 */
1785 seqlock_init(&net->ipv4.ip_local_ports.lock);
1786 net->ipv4.ip_local_ports.range[0] = 32768;
1787 net->ipv4.ip_local_ports.range[1] = 60999;
1788
1789 seqlock_init(&net->ipv4.ping_group_range.lock);
1790 /*
1791 * Sane defaults - nobody may create ping sockets.
1792 * Boot scripts should set this to distro-specific group.
1793 */
1794 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1795 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1796
1797 /* Default values for sysctl-controlled parameters.
1798 * We set them here, in case sysctl is not compiled.
1799 */
1800 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1801 net->ipv4.sysctl_ip_dynaddr = 0;
1802 net->ipv4.sysctl_ip_early_demux = 1;
1803 net->ipv4.sysctl_udp_early_demux = 1;
1804 net->ipv4.sysctl_tcp_early_demux = 1;
1805#ifdef CONFIG_SYSCTL
1806 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1807#endif
1808
1809 /* Some igmp sysctl, whose values are always used */
1810 net->ipv4.sysctl_igmp_max_memberships = 20;
1811 net->ipv4.sysctl_igmp_max_msf = 10;
1812 /* IGMP reports for link-local multicast groups are enabled by default */
1813 net->ipv4.sysctl_igmp_llm_reports = 1;
1814 net->ipv4.sysctl_igmp_qrv = 2;
1815
1816 return 0;
1817}
1818
1819static __net_exit void inet_exit_net(struct net *net)
1820{
1821}
1822
1823static __net_initdata struct pernet_operations af_inet_ops = {
1824 .init = inet_init_net,
1825 .exit = inet_exit_net,
1826};
1827
1828static int __init init_inet_pernet_ops(void)
1829{
1830 return register_pernet_subsys(&af_inet_ops);
1831}
1832
1833static int ipv4_proc_init(void);
1834
1835/*
1836 * IP protocol layer initialiser
1837 */
1838
1839static struct packet_offload ip_packet_offload __read_mostly = {
1840 .type = cpu_to_be16(ETH_P_IP),
1841 .callbacks = {
1842 .gso_segment = inet_gso_segment,
1843 .gro_receive = inet_gro_receive,
1844 .gro_complete = inet_gro_complete,
1845 },
1846};
1847
1848static const struct net_offload ipip_offload = {
1849 .callbacks = {
1850 .gso_segment = inet_gso_segment,
1851 .gro_receive = ipip_gro_receive,
1852 .gro_complete = ipip_gro_complete,
1853 },
1854};
1855
1856static int __init ipip_offload_init(void)
1857{
1858 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1859}
1860
1861static int __init ipv4_offload_init(void)
1862{
1863 /*
1864 * Add offloads
1865 */
1866 if (udpv4_offload_init() < 0)
1867 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1868 if (tcpv4_offload_init() < 0)
1869 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1870 if (ipip_offload_init() < 0)
1871 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1872
1873 dev_add_offload(&ip_packet_offload);
1874 return 0;
1875}
1876
1877fs_initcall(ipv4_offload_init);
1878
1879static struct packet_type ip_packet_type __read_mostly = {
1880 .type = cpu_to_be16(ETH_P_IP),
1881 .func = ip_rcv,
1882};
1883
1884static int __init inet_init(void)
1885{
1886 struct inet_protosw *q;
1887 struct list_head *r;
1888 int rc = -EINVAL;
1889
1890 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1891
1892 rc = proto_register(&tcp_prot, 1);
1893 if (rc)
1894 goto out;
1895
1896 rc = proto_register(&udp_prot, 1);
1897 if (rc)
1898 goto out_unregister_tcp_proto;
1899
1900 rc = proto_register(&raw_prot, 1);
1901 if (rc)
1902 goto out_unregister_udp_proto;
1903
1904 rc = proto_register(&ping_prot, 1);
1905 if (rc)
1906 goto out_unregister_raw_proto;
1907
1908 /*
1909 * Tell SOCKET that we are alive...
1910 */
1911
1912 (void)sock_register(&inet_family_ops);
1913
1914#ifdef CONFIG_SYSCTL
1915 ip_static_sysctl_init();
1916#endif
1917
1918 /*
1919 * Add all the base protocols.
1920 */
1921
1922 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1923 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1924 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1925 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1926 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1927 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1928#ifdef CONFIG_IP_MULTICAST
1929 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1930 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1931#endif
1932
1933 /* Register the socket-side information for inet_create. */
1934 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1935 INIT_LIST_HEAD(r);
1936
1937 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1938 inet_register_protosw(q);
1939
1940 /*
1941 * Set the ARP module up
1942 */
1943
1944 arp_init();
1945
1946 /*
1947 * Set the IP module up
1948 */
1949
1950 ip_init();
1951
1952 /* Setup TCP slab cache for open requests. */
1953 tcp_init();
1954
1955 /* Setup UDP memory threshold */
1956 udp_init();
1957
1958 /* Add UDP-Lite (RFC 3828) */
1959 udplite4_register();
1960
1961 ping_init();
1962
1963 /*
1964 * Set the ICMP layer up
1965 */
1966
1967 if (icmp_init() < 0)
1968 panic("Failed to create the ICMP control socket.\n");
1969
1970 /*
1971 * Initialise the multicast router
1972 */
1973#if defined(CONFIG_IP_MROUTE)
1974 if (ip_mr_init())
1975 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1976#endif
1977
1978 if (init_inet_pernet_ops())
1979 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
1980 /*
1981 * Initialise per-cpu ipv4 mibs
1982 */
1983
1984 if (init_ipv4_mibs())
1985 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1986
1987 ipv4_proc_init();
1988
1989 ipfrag_init();
1990
1991 dev_add_pack(&ip_packet_type);
1992
1993 ip_tunnel_core_init();
1994
1995 rc = 0;
1996out:
1997 return rc;
1998out_unregister_raw_proto:
1999 proto_unregister(&raw_prot);
2000out_unregister_udp_proto:
2001 proto_unregister(&udp_prot);
2002out_unregister_tcp_proto:
2003 proto_unregister(&tcp_prot);
2004 goto out;
2005}
2006
2007fs_initcall(inet_init);
2008
2009/* ------------------------------------------------------------------------ */
2010
2011#ifdef CONFIG_PROC_FS
2012static int __init ipv4_proc_init(void)
2013{
2014 int rc = 0;
2015
2016 if (raw_proc_init())
2017 goto out_raw;
2018 if (tcp4_proc_init())
2019 goto out_tcp;
2020 if (udp4_proc_init())
2021 goto out_udp;
2022 if (ping_proc_init())
2023 goto out_ping;
2024 if (ip_misc_proc_init())
2025 goto out_misc;
2026out:
2027 return rc;
2028out_misc:
2029 ping_proc_exit();
2030out_ping:
2031 udp4_proc_exit();
2032out_udp:
2033 tcp4_proc_exit();
2034out_tcp:
2035 raw_proc_exit();
2036out_raw:
2037 rc = -ENOMEM;
2038 goto out;
2039}
2040
2041#else /* CONFIG_PROC_FS */
2042static int __init ipv4_proc_init(void)
2043{
2044 return 0;
2045}
2046#endif /* CONFIG_PROC_FS */
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * PF_INET protocol family socket handler.
8 *
9 * Authors: Ross Biro
10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 * Florian La Roche, <flla@stud.uni-sb.de>
12 * Alan Cox, <A.Cox@swansea.ac.uk>
13 *
14 * Changes (see also sock.c)
15 *
16 * piggy,
17 * Karl Knutson : Socket protocol table
18 * A.N.Kuznetsov : Socket death error in accept().
19 * John Richardson : Fix non blocking error in connect()
20 * so sockets that fail to connect
21 * don't return -EINPROGRESS.
22 * Alan Cox : Asynchronous I/O support
23 * Alan Cox : Keep correct socket pointer on sock
24 * structures
25 * when accept() ed
26 * Alan Cox : Semantics of SO_LINGER aren't state
27 * moved to close when you look carefully.
28 * With this fixed and the accept bug fixed
29 * some RPC stuff seems happier.
30 * Niibe Yutaka : 4.4BSD style write async I/O
31 * Alan Cox,
32 * Tony Gale : Fixed reuse semantics.
33 * Alan Cox : bind() shouldn't abort existing but dead
34 * sockets. Stops FTP netin:.. I hope.
35 * Alan Cox : bind() works correctly for RAW sockets.
36 * Note that FreeBSD at least was broken
37 * in this respect so be careful with
38 * compatibility tests...
39 * Alan Cox : routing cache support
40 * Alan Cox : memzero the socket structure for
41 * compactness.
42 * Matt Day : nonblock connect error handler
43 * Alan Cox : Allow large numbers of pending sockets
44 * (eg for big web sites), but only if
45 * specifically application requested.
46 * Alan Cox : New buffering throughout IP. Used
47 * dumbly.
48 * Alan Cox : New buffering now used smartly.
49 * Alan Cox : BSD rather than common sense
50 * interpretation of listen.
51 * Germano Caronni : Assorted small races.
52 * Alan Cox : sendmsg/recvmsg basic support.
53 * Alan Cox : Only sendmsg/recvmsg now supported.
54 * Alan Cox : Locked down bind (see security list).
55 * Alan Cox : Loosened bind a little.
56 * Mike McLagan : ADD/DEL DLCI Ioctls
57 * Willy Konynenberg : Transparent proxying support.
58 * David S. Miller : New socket lookup architecture.
59 * Some other random speedups.
60 * Cyrus Durgin : Cleaned up file for kmod hacks.
61 * Andi Kleen : Fix inet_stream_connect TCP race.
62 */
63
64#define pr_fmt(fmt) "IPv4: " fmt
65
66#include <linux/err.h>
67#include <linux/errno.h>
68#include <linux/types.h>
69#include <linux/socket.h>
70#include <linux/in.h>
71#include <linux/kernel.h>
72#include <linux/kmod.h>
73#include <linux/sched.h>
74#include <linux/timer.h>
75#include <linux/string.h>
76#include <linux/sockios.h>
77#include <linux/net.h>
78#include <linux/capability.h>
79#include <linux/fcntl.h>
80#include <linux/mm.h>
81#include <linux/interrupt.h>
82#include <linux/stat.h>
83#include <linux/init.h>
84#include <linux/poll.h>
85#include <linux/netfilter_ipv4.h>
86#include <linux/random.h>
87#include <linux/slab.h>
88
89#include <linux/uaccess.h>
90
91#include <linux/inet.h>
92#include <linux/igmp.h>
93#include <linux/inetdevice.h>
94#include <linux/netdevice.h>
95#include <net/checksum.h>
96#include <net/ip.h>
97#include <net/protocol.h>
98#include <net/arp.h>
99#include <net/route.h>
100#include <net/ip_fib.h>
101#include <net/inet_connection_sock.h>
102#include <net/gro.h>
103#include <net/gso.h>
104#include <net/tcp.h>
105#include <net/udp.h>
106#include <net/udplite.h>
107#include <net/ping.h>
108#include <linux/skbuff.h>
109#include <net/sock.h>
110#include <net/raw.h>
111#include <net/icmp.h>
112#include <net/inet_common.h>
113#include <net/ip_tunnels.h>
114#include <net/xfrm.h>
115#include <net/net_namespace.h>
116#include <net/secure_seq.h>
117#ifdef CONFIG_IP_MROUTE
118#include <linux/mroute.h>
119#endif
120#include <net/l3mdev.h>
121#include <net/compat.h>
122#include <net/rps.h>
123
124#include <trace/events/sock.h>
125
126/* The inetsw table contains everything that inet_create needs to
127 * build a new socket.
128 */
129static struct list_head inetsw[SOCK_MAX];
130static DEFINE_SPINLOCK(inetsw_lock);
131
132/* New destruction routine */
133
134void inet_sock_destruct(struct sock *sk)
135{
136 struct inet_sock *inet = inet_sk(sk);
137
138 __skb_queue_purge(&sk->sk_receive_queue);
139 __skb_queue_purge(&sk->sk_error_queue);
140
141 sk_mem_reclaim_final(sk);
142
143 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
144 pr_err("Attempt to release TCP socket in state %d %p\n",
145 sk->sk_state, sk);
146 return;
147 }
148 if (!sock_flag(sk, SOCK_DEAD)) {
149 pr_err("Attempt to release alive inet socket %p\n", sk);
150 return;
151 }
152
153 WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc));
154 WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc));
155 WARN_ON_ONCE(sk->sk_wmem_queued);
156 WARN_ON_ONCE(sk_forward_alloc_get(sk));
157
158 kfree(rcu_dereference_protected(inet->inet_opt, 1));
159 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
160 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1));
161}
162EXPORT_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
174static 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
191int __inet_listen_sk(struct sock *sk, int backlog)
192{
193 unsigned char old_state = sk->sk_state;
194 int err, tcp_fastopen;
195
196 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
197 return -EINVAL;
198
199 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
200 /* Really, if the socket is already in listen state
201 * we can only allow the backlog to be adjusted.
202 */
203 if (old_state != TCP_LISTEN) {
204 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
205 * Note that only TCP sockets (SOCK_STREAM) will reach here.
206 * Also fastopen backlog may already been set via the option
207 * because the socket was in TCP_LISTEN state previously but
208 * was shutdown() rather than close().
209 */
210 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen);
211 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
212 (tcp_fastopen & TFO_SERVER_ENABLE) &&
213 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
214 fastopen_queue_tune(sk, backlog);
215 tcp_fastopen_init_key_once(sock_net(sk));
216 }
217
218 err = inet_csk_listen_start(sk);
219 if (err)
220 return err;
221
222 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
223 }
224 return 0;
225}
226
227/*
228 * Move a socket into listening state.
229 */
230int inet_listen(struct socket *sock, int backlog)
231{
232 struct sock *sk = sock->sk;
233 int err = -EINVAL;
234
235 lock_sock(sk);
236
237 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
238 goto out;
239
240 err = __inet_listen_sk(sk, backlog);
241
242out:
243 release_sock(sk);
244 return err;
245}
246EXPORT_SYMBOL(inet_listen);
247
248/*
249 * Create an inet socket.
250 */
251
252static int inet_create(struct net *net, struct socket *sock, int protocol,
253 int kern)
254{
255 struct sock *sk;
256 struct inet_protosw *answer;
257 struct inet_sock *inet;
258 struct proto *answer_prot;
259 unsigned char answer_flags;
260 int try_loading_module = 0;
261 int err;
262
263 if (protocol < 0 || protocol >= IPPROTO_MAX)
264 return -EINVAL;
265
266 sock->state = SS_UNCONNECTED;
267
268 /* Look for the requested type/protocol pair. */
269lookup_protocol:
270 err = -ESOCKTNOSUPPORT;
271 rcu_read_lock();
272 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
273
274 err = 0;
275 /* Check the non-wild match. */
276 if (protocol == answer->protocol) {
277 if (protocol != IPPROTO_IP)
278 break;
279 } else {
280 /* Check for the two wild cases. */
281 if (IPPROTO_IP == protocol) {
282 protocol = answer->protocol;
283 break;
284 }
285 if (IPPROTO_IP == answer->protocol)
286 break;
287 }
288 err = -EPROTONOSUPPORT;
289 }
290
291 if (unlikely(err)) {
292 if (try_loading_module < 2) {
293 rcu_read_unlock();
294 /*
295 * Be more specific, e.g. net-pf-2-proto-132-type-1
296 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
297 */
298 if (++try_loading_module == 1)
299 request_module("net-pf-%d-proto-%d-type-%d",
300 PF_INET, protocol, sock->type);
301 /*
302 * Fall back to generic, e.g. net-pf-2-proto-132
303 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
304 */
305 else
306 request_module("net-pf-%d-proto-%d",
307 PF_INET, protocol);
308 goto lookup_protocol;
309 } else
310 goto out_rcu_unlock;
311 }
312
313 err = -EPERM;
314 if (sock->type == SOCK_RAW && !kern &&
315 !ns_capable(net->user_ns, CAP_NET_RAW))
316 goto out_rcu_unlock;
317
318 sock->ops = answer->ops;
319 answer_prot = answer->prot;
320 answer_flags = answer->flags;
321 rcu_read_unlock();
322
323 WARN_ON(!answer_prot->slab);
324
325 err = -ENOMEM;
326 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
327 if (!sk)
328 goto out;
329
330 err = 0;
331 if (INET_PROTOSW_REUSE & answer_flags)
332 sk->sk_reuse = SK_CAN_REUSE;
333
334 if (INET_PROTOSW_ICSK & answer_flags)
335 inet_init_csk_locks(sk);
336
337 inet = inet_sk(sk);
338 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
339
340 inet_clear_bit(NODEFRAG, sk);
341
342 if (SOCK_RAW == sock->type) {
343 inet->inet_num = protocol;
344 if (IPPROTO_RAW == protocol)
345 inet_set_bit(HDRINCL, sk);
346 }
347
348 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
349 inet->pmtudisc = IP_PMTUDISC_DONT;
350 else
351 inet->pmtudisc = IP_PMTUDISC_WANT;
352
353 atomic_set(&inet->inet_id, 0);
354
355 sock_init_data(sock, sk);
356
357 sk->sk_destruct = inet_sock_destruct;
358 sk->sk_protocol = protocol;
359 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
360 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
361
362 inet->uc_ttl = -1;
363 inet_set_bit(MC_LOOP, sk);
364 inet->mc_ttl = 1;
365 inet_set_bit(MC_ALL, sk);
366 inet->mc_index = 0;
367 inet->mc_list = NULL;
368 inet->rcv_tos = 0;
369
370 if (inet->inet_num) {
371 /* It assumes that any protocol which allows
372 * the user to assign a number at socket
373 * creation time automatically
374 * shares.
375 */
376 inet->inet_sport = htons(inet->inet_num);
377 /* Add to protocol hash chains. */
378 err = sk->sk_prot->hash(sk);
379 if (err) {
380 sk_common_release(sk);
381 goto out;
382 }
383 }
384
385 if (sk->sk_prot->init) {
386 err = sk->sk_prot->init(sk);
387 if (err) {
388 sk_common_release(sk);
389 goto out;
390 }
391 }
392
393 if (!kern) {
394 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
395 if (err) {
396 sk_common_release(sk);
397 goto out;
398 }
399 }
400out:
401 return err;
402out_rcu_unlock:
403 rcu_read_unlock();
404 goto out;
405}
406
407
408/*
409 * The peer socket should always be NULL (or else). When we call this
410 * function we are destroying the object and from then on nobody
411 * should refer to it.
412 */
413int inet_release(struct socket *sock)
414{
415 struct sock *sk = sock->sk;
416
417 if (sk) {
418 long timeout;
419
420 if (!sk->sk_kern_sock)
421 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
422
423 /* Applications forget to leave groups before exiting */
424 ip_mc_drop_socket(sk);
425
426 /* If linger is set, we don't return until the close
427 * is complete. Otherwise we return immediately. The
428 * actually closing is done the same either way.
429 *
430 * If the close is due to the process exiting, we never
431 * linger..
432 */
433 timeout = 0;
434 if (sock_flag(sk, SOCK_LINGER) &&
435 !(current->flags & PF_EXITING))
436 timeout = sk->sk_lingertime;
437 sk->sk_prot->close(sk, timeout);
438 sock->sk = NULL;
439 }
440 return 0;
441}
442EXPORT_SYMBOL(inet_release);
443
444int inet_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
445{
446 u32 flags = BIND_WITH_LOCK;
447 int err;
448
449 /* If the socket has its own bind function then use it. (RAW) */
450 if (sk->sk_prot->bind) {
451 return sk->sk_prot->bind(sk, uaddr, addr_len);
452 }
453 if (addr_len < sizeof(struct sockaddr_in))
454 return -EINVAL;
455
456 /* BPF prog is run before any checks are done so that if the prog
457 * changes context in a wrong way it will be caught.
458 */
459 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
460 CGROUP_INET4_BIND, &flags);
461 if (err)
462 return err;
463
464 return __inet_bind(sk, uaddr, addr_len, flags);
465}
466
467int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
468{
469 return inet_bind_sk(sock->sk, uaddr, addr_len);
470}
471EXPORT_SYMBOL(inet_bind);
472
473int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
474 u32 flags)
475{
476 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
477 struct inet_sock *inet = inet_sk(sk);
478 struct net *net = sock_net(sk);
479 unsigned short snum;
480 int chk_addr_ret;
481 u32 tb_id = RT_TABLE_LOCAL;
482 int err;
483
484 if (addr->sin_family != AF_INET) {
485 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
486 * only if s_addr is INADDR_ANY.
487 */
488 err = -EAFNOSUPPORT;
489 if (addr->sin_family != AF_UNSPEC ||
490 addr->sin_addr.s_addr != htonl(INADDR_ANY))
491 goto out;
492 }
493
494 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
495 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
496
497 /* Not specified by any standard per-se, however it breaks too
498 * many applications when removed. It is unfortunate since
499 * allowing applications to make a non-local bind solves
500 * several problems with systems using dynamic addressing.
501 * (ie. your servers still start up even if your ISDN link
502 * is temporarily down)
503 */
504 err = -EADDRNOTAVAIL;
505 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
506 chk_addr_ret))
507 goto out;
508
509 snum = ntohs(addr->sin_port);
510 err = -EACCES;
511 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
512 snum && inet_port_requires_bind_service(net, snum) &&
513 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
514 goto out;
515
516 /* We keep a pair of addresses. rcv_saddr is the one
517 * used by hash lookups, and saddr is used for transmit.
518 *
519 * In the BSD API these are the same except where it
520 * would be illegal to use them (multicast/broadcast) in
521 * which case the sending device address is used.
522 */
523 if (flags & BIND_WITH_LOCK)
524 lock_sock(sk);
525
526 /* Check these errors (active socket, double bind). */
527 err = -EINVAL;
528 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
529 goto out_release_sock;
530
531 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
532 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
533 inet->inet_saddr = 0; /* Use device */
534
535 /* Make sure we are allowed to bind here. */
536 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
537 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
538 err = sk->sk_prot->get_port(sk, snum);
539 if (err) {
540 inet->inet_saddr = inet->inet_rcv_saddr = 0;
541 goto out_release_sock;
542 }
543 if (!(flags & BIND_FROM_BPF)) {
544 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
545 if (err) {
546 inet->inet_saddr = inet->inet_rcv_saddr = 0;
547 if (sk->sk_prot->put_port)
548 sk->sk_prot->put_port(sk);
549 goto out_release_sock;
550 }
551 }
552 }
553
554 if (inet->inet_rcv_saddr)
555 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
556 if (snum)
557 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
558 inet->inet_sport = htons(inet->inet_num);
559 inet->inet_daddr = 0;
560 inet->inet_dport = 0;
561 sk_dst_reset(sk);
562 err = 0;
563out_release_sock:
564 if (flags & BIND_WITH_LOCK)
565 release_sock(sk);
566out:
567 return err;
568}
569
570int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
571 int addr_len, int flags)
572{
573 struct sock *sk = sock->sk;
574 const struct proto *prot;
575 int err;
576
577 if (addr_len < sizeof(uaddr->sa_family))
578 return -EINVAL;
579
580 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
581 prot = READ_ONCE(sk->sk_prot);
582
583 if (uaddr->sa_family == AF_UNSPEC)
584 return prot->disconnect(sk, flags);
585
586 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
587 err = prot->pre_connect(sk, uaddr, addr_len);
588 if (err)
589 return err;
590 }
591
592 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
593 return -EAGAIN;
594 return prot->connect(sk, uaddr, addr_len);
595}
596EXPORT_SYMBOL(inet_dgram_connect);
597
598static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
599{
600 DEFINE_WAIT_FUNC(wait, woken_wake_function);
601
602 add_wait_queue(sk_sleep(sk), &wait);
603 sk->sk_write_pending += writebias;
604
605 /* Basic assumption: if someone sets sk->sk_err, he _must_
606 * change state of the socket from TCP_SYN_*.
607 * Connect() does not allow to get error notifications
608 * without closing the socket.
609 */
610 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
611 release_sock(sk);
612 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
613 lock_sock(sk);
614 if (signal_pending(current) || !timeo)
615 break;
616 }
617 remove_wait_queue(sk_sleep(sk), &wait);
618 sk->sk_write_pending -= writebias;
619 return timeo;
620}
621
622/*
623 * Connect to a remote host. There is regrettably still a little
624 * TCP 'magic' in here.
625 */
626int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
627 int addr_len, int flags, int is_sendmsg)
628{
629 struct sock *sk = sock->sk;
630 int err;
631 long timeo;
632
633 /*
634 * uaddr can be NULL and addr_len can be 0 if:
635 * sk is a TCP fastopen active socket and
636 * TCP_FASTOPEN_CONNECT sockopt is set and
637 * we already have a valid cookie for this socket.
638 * In this case, user can call write() after connect().
639 * write() will invoke tcp_sendmsg_fastopen() which calls
640 * __inet_stream_connect().
641 */
642 if (uaddr) {
643 if (addr_len < sizeof(uaddr->sa_family))
644 return -EINVAL;
645
646 if (uaddr->sa_family == AF_UNSPEC) {
647 sk->sk_disconnects++;
648 err = sk->sk_prot->disconnect(sk, flags);
649 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
650 goto out;
651 }
652 }
653
654 switch (sock->state) {
655 default:
656 err = -EINVAL;
657 goto out;
658 case SS_CONNECTED:
659 err = -EISCONN;
660 goto out;
661 case SS_CONNECTING:
662 if (inet_test_bit(DEFER_CONNECT, sk))
663 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
664 else
665 err = -EALREADY;
666 /* Fall out of switch with err, set for this state */
667 break;
668 case SS_UNCONNECTED:
669 err = -EISCONN;
670 if (sk->sk_state != TCP_CLOSE)
671 goto out;
672
673 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
674 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
675 if (err)
676 goto out;
677 }
678
679 err = sk->sk_prot->connect(sk, uaddr, addr_len);
680 if (err < 0)
681 goto out;
682
683 sock->state = SS_CONNECTING;
684
685 if (!err && inet_test_bit(DEFER_CONNECT, sk))
686 goto out;
687
688 /* Just entered SS_CONNECTING state; the only
689 * difference is that return value in non-blocking
690 * case is EINPROGRESS, rather than EALREADY.
691 */
692 err = -EINPROGRESS;
693 break;
694 }
695
696 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
697
698 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
699 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
700 tcp_sk(sk)->fastopen_req &&
701 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
702 int dis = sk->sk_disconnects;
703
704 /* Error code is set above */
705 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
706 goto out;
707
708 err = sock_intr_errno(timeo);
709 if (signal_pending(current))
710 goto out;
711
712 if (dis != sk->sk_disconnects) {
713 err = -EPIPE;
714 goto out;
715 }
716 }
717
718 /* Connection was closed by RST, timeout, ICMP error
719 * or another process disconnected us.
720 */
721 if (sk->sk_state == TCP_CLOSE)
722 goto sock_error;
723
724 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
725 * and error was received after socket entered established state.
726 * Hence, it is handled normally after connect() return successfully.
727 */
728
729 sock->state = SS_CONNECTED;
730 err = 0;
731out:
732 return err;
733
734sock_error:
735 err = sock_error(sk) ? : -ECONNABORTED;
736 sock->state = SS_UNCONNECTED;
737 sk->sk_disconnects++;
738 if (sk->sk_prot->disconnect(sk, flags))
739 sock->state = SS_DISCONNECTING;
740 goto out;
741}
742EXPORT_SYMBOL(__inet_stream_connect);
743
744int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
745 int addr_len, int flags)
746{
747 int err;
748
749 lock_sock(sock->sk);
750 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
751 release_sock(sock->sk);
752 return err;
753}
754EXPORT_SYMBOL(inet_stream_connect);
755
756void __inet_accept(struct socket *sock, struct socket *newsock, struct sock *newsk)
757{
758 sock_rps_record_flow(newsk);
759 WARN_ON(!((1 << newsk->sk_state) &
760 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
761 TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 |
762 TCPF_CLOSING | TCPF_CLOSE_WAIT |
763 TCPF_CLOSE)));
764
765 if (test_bit(SOCK_SUPPORT_ZC, &sock->flags))
766 set_bit(SOCK_SUPPORT_ZC, &newsock->flags);
767 sock_graft(newsk, newsock);
768
769 newsock->state = SS_CONNECTED;
770}
771
772/*
773 * Accept a pending connection. The TCP layer now gives BSD semantics.
774 */
775
776int inet_accept(struct socket *sock, struct socket *newsock, int flags,
777 bool kern)
778{
779 struct sock *sk1 = sock->sk, *sk2;
780 int err = -EINVAL;
781
782 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
783 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, flags, &err, kern);
784 if (!sk2)
785 return err;
786
787 lock_sock(sk2);
788 __inet_accept(sock, newsock, sk2);
789 release_sock(sk2);
790 return 0;
791}
792EXPORT_SYMBOL(inet_accept);
793
794/*
795 * This does both peername and sockname.
796 */
797int inet_getname(struct socket *sock, struct sockaddr *uaddr,
798 int peer)
799{
800 struct sock *sk = sock->sk;
801 struct inet_sock *inet = inet_sk(sk);
802 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
803 int sin_addr_len = sizeof(*sin);
804
805 sin->sin_family = AF_INET;
806 lock_sock(sk);
807 if (peer) {
808 if (!inet->inet_dport ||
809 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
810 peer == 1)) {
811 release_sock(sk);
812 return -ENOTCONN;
813 }
814 sin->sin_port = inet->inet_dport;
815 sin->sin_addr.s_addr = inet->inet_daddr;
816 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
817 CGROUP_INET4_GETPEERNAME);
818 } else {
819 __be32 addr = inet->inet_rcv_saddr;
820 if (!addr)
821 addr = inet->inet_saddr;
822 sin->sin_port = inet->inet_sport;
823 sin->sin_addr.s_addr = addr;
824 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
825 CGROUP_INET4_GETSOCKNAME);
826 }
827 release_sock(sk);
828 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
829 return sin_addr_len;
830}
831EXPORT_SYMBOL(inet_getname);
832
833int inet_send_prepare(struct sock *sk)
834{
835 sock_rps_record_flow(sk);
836
837 /* We may need to bind the socket. */
838 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
839 inet_autobind(sk))
840 return -EAGAIN;
841
842 return 0;
843}
844EXPORT_SYMBOL_GPL(inet_send_prepare);
845
846int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
847{
848 struct sock *sk = sock->sk;
849
850 if (unlikely(inet_send_prepare(sk)))
851 return -EAGAIN;
852
853 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
854 sk, msg, size);
855}
856EXPORT_SYMBOL(inet_sendmsg);
857
858void inet_splice_eof(struct socket *sock)
859{
860 const struct proto *prot;
861 struct sock *sk = sock->sk;
862
863 if (unlikely(inet_send_prepare(sk)))
864 return;
865
866 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
867 prot = READ_ONCE(sk->sk_prot);
868 if (prot->splice_eof)
869 prot->splice_eof(sock);
870}
871EXPORT_SYMBOL_GPL(inet_splice_eof);
872
873INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
874 size_t, int, int *));
875int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
876 int flags)
877{
878 struct sock *sk = sock->sk;
879 int addr_len = 0;
880 int err;
881
882 if (likely(!(flags & MSG_ERRQUEUE)))
883 sock_rps_record_flow(sk);
884
885 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
886 sk, msg, size, flags, &addr_len);
887 if (err >= 0)
888 msg->msg_namelen = addr_len;
889 return err;
890}
891EXPORT_SYMBOL(inet_recvmsg);
892
893int inet_shutdown(struct socket *sock, int how)
894{
895 struct sock *sk = sock->sk;
896 int err = 0;
897
898 /* This should really check to make sure
899 * the socket is a TCP socket. (WHY AC...)
900 */
901 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
902 1->2 bit 2 snds.
903 2->3 */
904 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
905 return -EINVAL;
906
907 lock_sock(sk);
908 if (sock->state == SS_CONNECTING) {
909 if ((1 << sk->sk_state) &
910 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
911 sock->state = SS_DISCONNECTING;
912 else
913 sock->state = SS_CONNECTED;
914 }
915
916 switch (sk->sk_state) {
917 case TCP_CLOSE:
918 err = -ENOTCONN;
919 /* Hack to wake up other listeners, who can poll for
920 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
921 fallthrough;
922 default:
923 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how);
924 if (sk->sk_prot->shutdown)
925 sk->sk_prot->shutdown(sk, how);
926 break;
927
928 /* Remaining two branches are temporary solution for missing
929 * close() in multithreaded environment. It is _not_ a good idea,
930 * but we have no choice until close() is repaired at VFS level.
931 */
932 case TCP_LISTEN:
933 if (!(how & RCV_SHUTDOWN))
934 break;
935 fallthrough;
936 case TCP_SYN_SENT:
937 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
938 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
939 break;
940 }
941
942 /* Wake up anyone sleeping in poll. */
943 sk->sk_state_change(sk);
944 release_sock(sk);
945 return err;
946}
947EXPORT_SYMBOL(inet_shutdown);
948
949/*
950 * ioctl() calls you can issue on an INET socket. Most of these are
951 * device configuration and stuff and very rarely used. Some ioctls
952 * pass on to the socket itself.
953 *
954 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
955 * loads the devconfigure module does its configuring and unloads it.
956 * There's a good 20K of config code hanging around the kernel.
957 */
958
959int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
960{
961 struct sock *sk = sock->sk;
962 int err = 0;
963 struct net *net = sock_net(sk);
964 void __user *p = (void __user *)arg;
965 struct ifreq ifr;
966 struct rtentry rt;
967
968 switch (cmd) {
969 case SIOCADDRT:
970 case SIOCDELRT:
971 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
972 return -EFAULT;
973 err = ip_rt_ioctl(net, cmd, &rt);
974 break;
975 case SIOCRTMSG:
976 err = -EINVAL;
977 break;
978 case SIOCDARP:
979 case SIOCGARP:
980 case SIOCSARP:
981 err = arp_ioctl(net, cmd, (void __user *)arg);
982 break;
983 case SIOCGIFADDR:
984 case SIOCGIFBRDADDR:
985 case SIOCGIFNETMASK:
986 case SIOCGIFDSTADDR:
987 case SIOCGIFPFLAGS:
988 if (get_user_ifreq(&ifr, NULL, p))
989 return -EFAULT;
990 err = devinet_ioctl(net, cmd, &ifr);
991 if (!err && put_user_ifreq(&ifr, p))
992 err = -EFAULT;
993 break;
994
995 case SIOCSIFADDR:
996 case SIOCSIFBRDADDR:
997 case SIOCSIFNETMASK:
998 case SIOCSIFDSTADDR:
999 case SIOCSIFPFLAGS:
1000 case SIOCSIFFLAGS:
1001 if (get_user_ifreq(&ifr, NULL, p))
1002 return -EFAULT;
1003 err = devinet_ioctl(net, cmd, &ifr);
1004 break;
1005 default:
1006 if (sk->sk_prot->ioctl)
1007 err = sk_ioctl(sk, cmd, (void __user *)arg);
1008 else
1009 err = -ENOIOCTLCMD;
1010 break;
1011 }
1012 return err;
1013}
1014EXPORT_SYMBOL(inet_ioctl);
1015
1016#ifdef CONFIG_COMPAT
1017static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
1018 struct compat_rtentry __user *ur)
1019{
1020 compat_uptr_t rtdev;
1021 struct rtentry rt;
1022
1023 if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
1024 3 * sizeof(struct sockaddr)) ||
1025 get_user(rt.rt_flags, &ur->rt_flags) ||
1026 get_user(rt.rt_metric, &ur->rt_metric) ||
1027 get_user(rt.rt_mtu, &ur->rt_mtu) ||
1028 get_user(rt.rt_window, &ur->rt_window) ||
1029 get_user(rt.rt_irtt, &ur->rt_irtt) ||
1030 get_user(rtdev, &ur->rt_dev))
1031 return -EFAULT;
1032
1033 rt.rt_dev = compat_ptr(rtdev);
1034 return ip_rt_ioctl(sock_net(sk), cmd, &rt);
1035}
1036
1037static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1038{
1039 void __user *argp = compat_ptr(arg);
1040 struct sock *sk = sock->sk;
1041
1042 switch (cmd) {
1043 case SIOCADDRT:
1044 case SIOCDELRT:
1045 return inet_compat_routing_ioctl(sk, cmd, argp);
1046 default:
1047 if (!sk->sk_prot->compat_ioctl)
1048 return -ENOIOCTLCMD;
1049 return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1050 }
1051}
1052#endif /* CONFIG_COMPAT */
1053
1054const struct proto_ops inet_stream_ops = {
1055 .family = PF_INET,
1056 .owner = THIS_MODULE,
1057 .release = inet_release,
1058 .bind = inet_bind,
1059 .connect = inet_stream_connect,
1060 .socketpair = sock_no_socketpair,
1061 .accept = inet_accept,
1062 .getname = inet_getname,
1063 .poll = tcp_poll,
1064 .ioctl = inet_ioctl,
1065 .gettstamp = sock_gettstamp,
1066 .listen = inet_listen,
1067 .shutdown = inet_shutdown,
1068 .setsockopt = sock_common_setsockopt,
1069 .getsockopt = sock_common_getsockopt,
1070 .sendmsg = inet_sendmsg,
1071 .recvmsg = inet_recvmsg,
1072#ifdef CONFIG_MMU
1073 .mmap = tcp_mmap,
1074#endif
1075 .splice_eof = inet_splice_eof,
1076 .splice_read = tcp_splice_read,
1077 .read_sock = tcp_read_sock,
1078 .read_skb = tcp_read_skb,
1079 .sendmsg_locked = tcp_sendmsg_locked,
1080 .peek_len = tcp_peek_len,
1081#ifdef CONFIG_COMPAT
1082 .compat_ioctl = inet_compat_ioctl,
1083#endif
1084 .set_rcvlowat = tcp_set_rcvlowat,
1085};
1086EXPORT_SYMBOL(inet_stream_ops);
1087
1088const struct proto_ops inet_dgram_ops = {
1089 .family = PF_INET,
1090 .owner = THIS_MODULE,
1091 .release = inet_release,
1092 .bind = inet_bind,
1093 .connect = inet_dgram_connect,
1094 .socketpair = sock_no_socketpair,
1095 .accept = sock_no_accept,
1096 .getname = inet_getname,
1097 .poll = udp_poll,
1098 .ioctl = inet_ioctl,
1099 .gettstamp = sock_gettstamp,
1100 .listen = sock_no_listen,
1101 .shutdown = inet_shutdown,
1102 .setsockopt = sock_common_setsockopt,
1103 .getsockopt = sock_common_getsockopt,
1104 .sendmsg = inet_sendmsg,
1105 .read_skb = udp_read_skb,
1106 .recvmsg = inet_recvmsg,
1107 .mmap = sock_no_mmap,
1108 .splice_eof = inet_splice_eof,
1109 .set_peek_off = udp_set_peek_off,
1110#ifdef CONFIG_COMPAT
1111 .compat_ioctl = inet_compat_ioctl,
1112#endif
1113};
1114EXPORT_SYMBOL(inet_dgram_ops);
1115
1116/*
1117 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1118 * udp_poll
1119 */
1120static const struct proto_ops inet_sockraw_ops = {
1121 .family = PF_INET,
1122 .owner = THIS_MODULE,
1123 .release = inet_release,
1124 .bind = inet_bind,
1125 .connect = inet_dgram_connect,
1126 .socketpair = sock_no_socketpair,
1127 .accept = sock_no_accept,
1128 .getname = inet_getname,
1129 .poll = datagram_poll,
1130 .ioctl = inet_ioctl,
1131 .gettstamp = sock_gettstamp,
1132 .listen = sock_no_listen,
1133 .shutdown = inet_shutdown,
1134 .setsockopt = sock_common_setsockopt,
1135 .getsockopt = sock_common_getsockopt,
1136 .sendmsg = inet_sendmsg,
1137 .recvmsg = inet_recvmsg,
1138 .mmap = sock_no_mmap,
1139 .splice_eof = inet_splice_eof,
1140#ifdef CONFIG_COMPAT
1141 .compat_ioctl = inet_compat_ioctl,
1142#endif
1143};
1144
1145static const struct net_proto_family inet_family_ops = {
1146 .family = PF_INET,
1147 .create = inet_create,
1148 .owner = THIS_MODULE,
1149};
1150
1151/* Upon startup we insert all the elements in inetsw_array[] into
1152 * the linked list inetsw.
1153 */
1154static struct inet_protosw inetsw_array[] =
1155{
1156 {
1157 .type = SOCK_STREAM,
1158 .protocol = IPPROTO_TCP,
1159 .prot = &tcp_prot,
1160 .ops = &inet_stream_ops,
1161 .flags = INET_PROTOSW_PERMANENT |
1162 INET_PROTOSW_ICSK,
1163 },
1164
1165 {
1166 .type = SOCK_DGRAM,
1167 .protocol = IPPROTO_UDP,
1168 .prot = &udp_prot,
1169 .ops = &inet_dgram_ops,
1170 .flags = INET_PROTOSW_PERMANENT,
1171 },
1172
1173 {
1174 .type = SOCK_DGRAM,
1175 .protocol = IPPROTO_ICMP,
1176 .prot = &ping_prot,
1177 .ops = &inet_sockraw_ops,
1178 .flags = INET_PROTOSW_REUSE,
1179 },
1180
1181 {
1182 .type = SOCK_RAW,
1183 .protocol = IPPROTO_IP, /* wild card */
1184 .prot = &raw_prot,
1185 .ops = &inet_sockraw_ops,
1186 .flags = INET_PROTOSW_REUSE,
1187 }
1188};
1189
1190#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1191
1192void inet_register_protosw(struct inet_protosw *p)
1193{
1194 struct list_head *lh;
1195 struct inet_protosw *answer;
1196 int protocol = p->protocol;
1197 struct list_head *last_perm;
1198
1199 spin_lock_bh(&inetsw_lock);
1200
1201 if (p->type >= SOCK_MAX)
1202 goto out_illegal;
1203
1204 /* If we are trying to override a permanent protocol, bail. */
1205 last_perm = &inetsw[p->type];
1206 list_for_each(lh, &inetsw[p->type]) {
1207 answer = list_entry(lh, struct inet_protosw, list);
1208 /* Check only the non-wild match. */
1209 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1210 break;
1211 if (protocol == answer->protocol)
1212 goto out_permanent;
1213 last_perm = lh;
1214 }
1215
1216 /* Add the new entry after the last permanent entry if any, so that
1217 * the new entry does not override a permanent entry when matched with
1218 * a wild-card protocol. But it is allowed to override any existing
1219 * non-permanent entry. This means that when we remove this entry, the
1220 * system automatically returns to the old behavior.
1221 */
1222 list_add_rcu(&p->list, last_perm);
1223out:
1224 spin_unlock_bh(&inetsw_lock);
1225
1226 return;
1227
1228out_permanent:
1229 pr_err("Attempt to override permanent protocol %d\n", protocol);
1230 goto out;
1231
1232out_illegal:
1233 pr_err("Ignoring attempt to register invalid socket type %d\n",
1234 p->type);
1235 goto out;
1236}
1237EXPORT_SYMBOL(inet_register_protosw);
1238
1239void inet_unregister_protosw(struct inet_protosw *p)
1240{
1241 if (INET_PROTOSW_PERMANENT & p->flags) {
1242 pr_err("Attempt to unregister permanent protocol %d\n",
1243 p->protocol);
1244 } else {
1245 spin_lock_bh(&inetsw_lock);
1246 list_del_rcu(&p->list);
1247 spin_unlock_bh(&inetsw_lock);
1248
1249 synchronize_net();
1250 }
1251}
1252EXPORT_SYMBOL(inet_unregister_protosw);
1253
1254static int inet_sk_reselect_saddr(struct sock *sk)
1255{
1256 struct inet_sock *inet = inet_sk(sk);
1257 __be32 old_saddr = inet->inet_saddr;
1258 __be32 daddr = inet->inet_daddr;
1259 struct flowi4 *fl4;
1260 struct rtable *rt;
1261 __be32 new_saddr;
1262 struct ip_options_rcu *inet_opt;
1263 int err;
1264
1265 inet_opt = rcu_dereference_protected(inet->inet_opt,
1266 lockdep_sock_is_held(sk));
1267 if (inet_opt && inet_opt->opt.srr)
1268 daddr = inet_opt->opt.faddr;
1269
1270 /* Query new route. */
1271 fl4 = &inet->cork.fl.u.ip4;
1272 rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if,
1273 sk->sk_protocol, inet->inet_sport,
1274 inet->inet_dport, sk);
1275 if (IS_ERR(rt))
1276 return PTR_ERR(rt);
1277
1278 new_saddr = fl4->saddr;
1279
1280 if (new_saddr == old_saddr) {
1281 sk_setup_caps(sk, &rt->dst);
1282 return 0;
1283 }
1284
1285 err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET);
1286 if (err) {
1287 ip_rt_put(rt);
1288 return err;
1289 }
1290
1291 sk_setup_caps(sk, &rt->dst);
1292
1293 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1294 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1295 __func__, &old_saddr, &new_saddr);
1296 }
1297
1298 /*
1299 * XXX The only one ugly spot where we need to
1300 * XXX really change the sockets identity after
1301 * XXX it has entered the hashes. -DaveM
1302 *
1303 * Besides that, it does not check for connection
1304 * uniqueness. Wait for troubles.
1305 */
1306 return __sk_prot_rehash(sk);
1307}
1308
1309int inet_sk_rebuild_header(struct sock *sk)
1310{
1311 struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0));
1312 struct inet_sock *inet = inet_sk(sk);
1313 __be32 daddr;
1314 struct ip_options_rcu *inet_opt;
1315 struct flowi4 *fl4;
1316 int err;
1317
1318 /* Route is OK, nothing to do. */
1319 if (rt)
1320 return 0;
1321
1322 /* Reroute. */
1323 rcu_read_lock();
1324 inet_opt = rcu_dereference(inet->inet_opt);
1325 daddr = inet->inet_daddr;
1326 if (inet_opt && inet_opt->opt.srr)
1327 daddr = inet_opt->opt.faddr;
1328 rcu_read_unlock();
1329 fl4 = &inet->cork.fl.u.ip4;
1330 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1331 inet->inet_dport, inet->inet_sport,
1332 sk->sk_protocol, ip_sock_rt_tos(sk),
1333 sk->sk_bound_dev_if);
1334 if (!IS_ERR(rt)) {
1335 err = 0;
1336 sk_setup_caps(sk, &rt->dst);
1337 } else {
1338 err = PTR_ERR(rt);
1339
1340 /* Routing failed... */
1341 sk->sk_route_caps = 0;
1342 /*
1343 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1344 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1345 */
1346 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1347 sk->sk_state != TCP_SYN_SENT ||
1348 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1349 (err = inet_sk_reselect_saddr(sk)) != 0)
1350 WRITE_ONCE(sk->sk_err_soft, -err);
1351 }
1352
1353 return err;
1354}
1355EXPORT_SYMBOL(inet_sk_rebuild_header);
1356
1357void inet_sk_set_state(struct sock *sk, int state)
1358{
1359 trace_inet_sock_set_state(sk, sk->sk_state, state);
1360 sk->sk_state = state;
1361}
1362EXPORT_SYMBOL(inet_sk_set_state);
1363
1364void inet_sk_state_store(struct sock *sk, int newstate)
1365{
1366 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1367 smp_store_release(&sk->sk_state, newstate);
1368}
1369
1370struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1371 netdev_features_t features)
1372{
1373 bool udpfrag = false, fixedid = false, gso_partial, encap;
1374 struct sk_buff *segs = ERR_PTR(-EINVAL);
1375 const struct net_offload *ops;
1376 unsigned int offset = 0;
1377 struct iphdr *iph;
1378 int proto, tot_len;
1379 int nhoff;
1380 int ihl;
1381 int id;
1382
1383 skb_reset_network_header(skb);
1384 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1385 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1386 goto out;
1387
1388 iph = ip_hdr(skb);
1389 ihl = iph->ihl * 4;
1390 if (ihl < sizeof(*iph))
1391 goto out;
1392
1393 id = ntohs(iph->id);
1394 proto = iph->protocol;
1395
1396 /* Warning: after this point, iph might be no longer valid */
1397 if (unlikely(!pskb_may_pull(skb, ihl)))
1398 goto out;
1399 __skb_pull(skb, ihl);
1400
1401 encap = SKB_GSO_CB(skb)->encap_level > 0;
1402 if (encap)
1403 features &= skb->dev->hw_enc_features;
1404 SKB_GSO_CB(skb)->encap_level += ihl;
1405
1406 skb_reset_transport_header(skb);
1407
1408 segs = ERR_PTR(-EPROTONOSUPPORT);
1409
1410 if (!skb->encapsulation || encap) {
1411 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1412 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1413
1414 /* fixed ID is invalid if DF bit is not set */
1415 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1416 goto out;
1417 }
1418
1419 ops = rcu_dereference(inet_offloads[proto]);
1420 if (likely(ops && ops->callbacks.gso_segment)) {
1421 segs = ops->callbacks.gso_segment(skb, features);
1422 if (!segs)
1423 skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1424 }
1425
1426 if (IS_ERR_OR_NULL(segs))
1427 goto out;
1428
1429 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1430
1431 skb = segs;
1432 do {
1433 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1434 if (udpfrag) {
1435 iph->frag_off = htons(offset >> 3);
1436 if (skb->next)
1437 iph->frag_off |= htons(IP_MF);
1438 offset += skb->len - nhoff - ihl;
1439 tot_len = skb->len - nhoff;
1440 } else if (skb_is_gso(skb)) {
1441 if (!fixedid) {
1442 iph->id = htons(id);
1443 id += skb_shinfo(skb)->gso_segs;
1444 }
1445
1446 if (gso_partial)
1447 tot_len = skb_shinfo(skb)->gso_size +
1448 SKB_GSO_CB(skb)->data_offset +
1449 skb->head - (unsigned char *)iph;
1450 else
1451 tot_len = skb->len - nhoff;
1452 } else {
1453 if (!fixedid)
1454 iph->id = htons(id++);
1455 tot_len = skb->len - nhoff;
1456 }
1457 iph->tot_len = htons(tot_len);
1458 ip_send_check(iph);
1459 if (encap)
1460 skb_reset_inner_headers(skb);
1461 skb->network_header = (u8 *)iph - skb->head;
1462 skb_reset_mac_len(skb);
1463 } while ((skb = skb->next));
1464
1465out:
1466 return segs;
1467}
1468
1469static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1470 netdev_features_t features)
1471{
1472 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1473 return ERR_PTR(-EINVAL);
1474
1475 return inet_gso_segment(skb, features);
1476}
1477
1478struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1479{
1480 const struct net_offload *ops;
1481 struct sk_buff *pp = NULL;
1482 const struct iphdr *iph;
1483 struct sk_buff *p;
1484 unsigned int hlen;
1485 unsigned int off;
1486 unsigned int id;
1487 int flush = 1;
1488 int proto;
1489
1490 off = skb_gro_offset(skb);
1491 hlen = off + sizeof(*iph);
1492 iph = skb_gro_header(skb, hlen, off);
1493 if (unlikely(!iph))
1494 goto out;
1495
1496 proto = iph->protocol;
1497
1498 ops = rcu_dereference(inet_offloads[proto]);
1499 if (!ops || !ops->callbacks.gro_receive)
1500 goto out;
1501
1502 if (*(u8 *)iph != 0x45)
1503 goto out;
1504
1505 if (ip_is_fragment(iph))
1506 goto out;
1507
1508 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1509 goto out;
1510
1511 NAPI_GRO_CB(skb)->proto = proto;
1512 id = ntohl(*(__be32 *)&iph->id);
1513 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1514 id >>= 16;
1515
1516 list_for_each_entry(p, head, list) {
1517 struct iphdr *iph2;
1518 u16 flush_id;
1519
1520 if (!NAPI_GRO_CB(p)->same_flow)
1521 continue;
1522
1523 iph2 = (struct iphdr *)(p->data + off);
1524 /* The above works because, with the exception of the top
1525 * (inner most) layer, we only aggregate pkts with the same
1526 * hdr length so all the hdrs we'll need to verify will start
1527 * at the same offset.
1528 */
1529 if ((iph->protocol ^ iph2->protocol) |
1530 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1531 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1532 NAPI_GRO_CB(p)->same_flow = 0;
1533 continue;
1534 }
1535
1536 /* All fields must match except length and checksum. */
1537 NAPI_GRO_CB(p)->flush |=
1538 (iph->ttl ^ iph2->ttl) |
1539 (iph->tos ^ iph2->tos) |
1540 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1541
1542 NAPI_GRO_CB(p)->flush |= flush;
1543
1544 /* We need to store of the IP ID check to be included later
1545 * when we can verify that this packet does in fact belong
1546 * to a given flow.
1547 */
1548 flush_id = (u16)(id - ntohs(iph2->id));
1549
1550 /* This bit of code makes it much easier for us to identify
1551 * the cases where we are doing atomic vs non-atomic IP ID
1552 * checks. Specifically an atomic check can return IP ID
1553 * values 0 - 0xFFFF, while a non-atomic check can only
1554 * return 0 or 0xFFFF.
1555 */
1556 if (!NAPI_GRO_CB(p)->is_atomic ||
1557 !(iph->frag_off & htons(IP_DF))) {
1558 flush_id ^= NAPI_GRO_CB(p)->count;
1559 flush_id = flush_id ? 0xFFFF : 0;
1560 }
1561
1562 /* If the previous IP ID value was based on an atomic
1563 * datagram we can overwrite the value and ignore it.
1564 */
1565 if (NAPI_GRO_CB(skb)->is_atomic)
1566 NAPI_GRO_CB(p)->flush_id = flush_id;
1567 else
1568 NAPI_GRO_CB(p)->flush_id |= flush_id;
1569 }
1570
1571 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1572 NAPI_GRO_CB(skb)->flush |= flush;
1573 skb_set_network_header(skb, off);
1574 /* The above will be needed by the transport layer if there is one
1575 * immediately following this IP hdr.
1576 */
1577 NAPI_GRO_CB(skb)->inner_network_offset = off;
1578
1579 /* Note : No need to call skb_gro_postpull_rcsum() here,
1580 * as we already checked checksum over ipv4 header was 0
1581 */
1582 skb_gro_pull(skb, sizeof(*iph));
1583 skb_set_transport_header(skb, skb_gro_offset(skb));
1584
1585 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1586 ops->callbacks.gro_receive, head, skb);
1587
1588out:
1589 skb_gro_flush_final(skb, pp, flush);
1590
1591 return pp;
1592}
1593
1594static struct sk_buff *ipip_gro_receive(struct list_head *head,
1595 struct sk_buff *skb)
1596{
1597 if (NAPI_GRO_CB(skb)->encap_mark) {
1598 NAPI_GRO_CB(skb)->flush = 1;
1599 return NULL;
1600 }
1601
1602 NAPI_GRO_CB(skb)->encap_mark = 1;
1603
1604 return inet_gro_receive(head, skb);
1605}
1606
1607#define SECONDS_PER_DAY 86400
1608
1609/* inet_current_timestamp - Return IP network timestamp
1610 *
1611 * Return milliseconds since midnight in network byte order.
1612 */
1613__be32 inet_current_timestamp(void)
1614{
1615 u32 secs;
1616 u32 msecs;
1617 struct timespec64 ts;
1618
1619 ktime_get_real_ts64(&ts);
1620
1621 /* Get secs since midnight. */
1622 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1623 /* Convert to msecs. */
1624 msecs = secs * MSEC_PER_SEC;
1625 /* Convert nsec to msec. */
1626 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1627
1628 /* Convert to network byte order. */
1629 return htonl(msecs);
1630}
1631EXPORT_SYMBOL(inet_current_timestamp);
1632
1633int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1634{
1635 unsigned int family = READ_ONCE(sk->sk_family);
1636
1637 if (family == AF_INET)
1638 return ip_recv_error(sk, msg, len, addr_len);
1639#if IS_ENABLED(CONFIG_IPV6)
1640 if (family == AF_INET6)
1641 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1642#endif
1643 return -EINVAL;
1644}
1645EXPORT_SYMBOL(inet_recv_error);
1646
1647int inet_gro_complete(struct sk_buff *skb, int nhoff)
1648{
1649 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1650 const struct net_offload *ops;
1651 __be16 totlen = iph->tot_len;
1652 int proto = iph->protocol;
1653 int err = -ENOSYS;
1654
1655 if (skb->encapsulation) {
1656 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1657 skb_set_inner_network_header(skb, nhoff);
1658 }
1659
1660 iph_set_totlen(iph, skb->len - nhoff);
1661 csum_replace2(&iph->check, totlen, iph->tot_len);
1662
1663 ops = rcu_dereference(inet_offloads[proto]);
1664 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1665 goto out;
1666
1667 /* Only need to add sizeof(*iph) to get to the next hdr below
1668 * because any hdr with option will have been flushed in
1669 * inet_gro_receive().
1670 */
1671 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1672 tcp4_gro_complete, udp4_gro_complete,
1673 skb, nhoff + sizeof(*iph));
1674
1675out:
1676 return err;
1677}
1678
1679static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1680{
1681 skb->encapsulation = 1;
1682 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1683 return inet_gro_complete(skb, nhoff);
1684}
1685
1686int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1687 unsigned short type, unsigned char protocol,
1688 struct net *net)
1689{
1690 struct socket *sock;
1691 int rc = sock_create_kern(net, family, type, protocol, &sock);
1692
1693 if (rc == 0) {
1694 *sk = sock->sk;
1695 (*sk)->sk_allocation = GFP_ATOMIC;
1696 (*sk)->sk_use_task_frag = false;
1697 /*
1698 * Unhash it so that IP input processing does not even see it,
1699 * we do not wish this socket to see incoming packets.
1700 */
1701 (*sk)->sk_prot->unhash(*sk);
1702 }
1703 return rc;
1704}
1705EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1706
1707unsigned long snmp_fold_field(void __percpu *mib, int offt)
1708{
1709 unsigned long res = 0;
1710 int i;
1711
1712 for_each_possible_cpu(i)
1713 res += snmp_get_cpu_field(mib, i, offt);
1714 return res;
1715}
1716EXPORT_SYMBOL_GPL(snmp_fold_field);
1717
1718#if BITS_PER_LONG==32
1719
1720u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1721 size_t syncp_offset)
1722{
1723 void *bhptr;
1724 struct u64_stats_sync *syncp;
1725 u64 v;
1726 unsigned int start;
1727
1728 bhptr = per_cpu_ptr(mib, cpu);
1729 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1730 do {
1731 start = u64_stats_fetch_begin(syncp);
1732 v = *(((u64 *)bhptr) + offt);
1733 } while (u64_stats_fetch_retry(syncp, start));
1734
1735 return v;
1736}
1737EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1738
1739u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1740{
1741 u64 res = 0;
1742 int cpu;
1743
1744 for_each_possible_cpu(cpu) {
1745 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1746 }
1747 return res;
1748}
1749EXPORT_SYMBOL_GPL(snmp_fold_field64);
1750#endif
1751
1752#ifdef CONFIG_IP_MULTICAST
1753static const struct net_protocol igmp_protocol = {
1754 .handler = igmp_rcv,
1755};
1756#endif
1757
1758static const struct net_protocol icmp_protocol = {
1759 .handler = icmp_rcv,
1760 .err_handler = icmp_err,
1761 .no_policy = 1,
1762};
1763
1764static __net_init int ipv4_mib_init_net(struct net *net)
1765{
1766 int i;
1767
1768 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1769 if (!net->mib.tcp_statistics)
1770 goto err_tcp_mib;
1771 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1772 if (!net->mib.ip_statistics)
1773 goto err_ip_mib;
1774
1775 for_each_possible_cpu(i) {
1776 struct ipstats_mib *af_inet_stats;
1777 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1778 u64_stats_init(&af_inet_stats->syncp);
1779 }
1780
1781 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1782 if (!net->mib.net_statistics)
1783 goto err_net_mib;
1784 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1785 if (!net->mib.udp_statistics)
1786 goto err_udp_mib;
1787 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1788 if (!net->mib.udplite_statistics)
1789 goto err_udplite_mib;
1790 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1791 if (!net->mib.icmp_statistics)
1792 goto err_icmp_mib;
1793 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1794 GFP_KERNEL);
1795 if (!net->mib.icmpmsg_statistics)
1796 goto err_icmpmsg_mib;
1797
1798 tcp_mib_init(net);
1799 return 0;
1800
1801err_icmpmsg_mib:
1802 free_percpu(net->mib.icmp_statistics);
1803err_icmp_mib:
1804 free_percpu(net->mib.udplite_statistics);
1805err_udplite_mib:
1806 free_percpu(net->mib.udp_statistics);
1807err_udp_mib:
1808 free_percpu(net->mib.net_statistics);
1809err_net_mib:
1810 free_percpu(net->mib.ip_statistics);
1811err_ip_mib:
1812 free_percpu(net->mib.tcp_statistics);
1813err_tcp_mib:
1814 return -ENOMEM;
1815}
1816
1817static __net_exit void ipv4_mib_exit_net(struct net *net)
1818{
1819 kfree(net->mib.icmpmsg_statistics);
1820 free_percpu(net->mib.icmp_statistics);
1821 free_percpu(net->mib.udplite_statistics);
1822 free_percpu(net->mib.udp_statistics);
1823 free_percpu(net->mib.net_statistics);
1824 free_percpu(net->mib.ip_statistics);
1825 free_percpu(net->mib.tcp_statistics);
1826#ifdef CONFIG_MPTCP
1827 /* allocated on demand, see mptcp_init_sock() */
1828 free_percpu(net->mib.mptcp_statistics);
1829#endif
1830}
1831
1832static __net_initdata struct pernet_operations ipv4_mib_ops = {
1833 .init = ipv4_mib_init_net,
1834 .exit = ipv4_mib_exit_net,
1835};
1836
1837static int __init init_ipv4_mibs(void)
1838{
1839 return register_pernet_subsys(&ipv4_mib_ops);
1840}
1841
1842static __net_init int inet_init_net(struct net *net)
1843{
1844 /*
1845 * Set defaults for local port range
1846 */
1847 net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u;
1848
1849 seqlock_init(&net->ipv4.ping_group_range.lock);
1850 /*
1851 * Sane defaults - nobody may create ping sockets.
1852 * Boot scripts should set this to distro-specific group.
1853 */
1854 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1855 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1856
1857 /* Default values for sysctl-controlled parameters.
1858 * We set them here, in case sysctl is not compiled.
1859 */
1860 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1861 net->ipv4.sysctl_ip_fwd_update_priority = 1;
1862 net->ipv4.sysctl_ip_dynaddr = 0;
1863 net->ipv4.sysctl_ip_early_demux = 1;
1864 net->ipv4.sysctl_udp_early_demux = 1;
1865 net->ipv4.sysctl_tcp_early_demux = 1;
1866 net->ipv4.sysctl_nexthop_compat_mode = 1;
1867#ifdef CONFIG_SYSCTL
1868 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1869#endif
1870
1871 /* Some igmp sysctl, whose values are always used */
1872 net->ipv4.sysctl_igmp_max_memberships = 20;
1873 net->ipv4.sysctl_igmp_max_msf = 10;
1874 /* IGMP reports for link-local multicast groups are enabled by default */
1875 net->ipv4.sysctl_igmp_llm_reports = 1;
1876 net->ipv4.sysctl_igmp_qrv = 2;
1877
1878 net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1879
1880 return 0;
1881}
1882
1883static __net_initdata struct pernet_operations af_inet_ops = {
1884 .init = inet_init_net,
1885};
1886
1887static int __init init_inet_pernet_ops(void)
1888{
1889 return register_pernet_subsys(&af_inet_ops);
1890}
1891
1892static int ipv4_proc_init(void);
1893
1894/*
1895 * IP protocol layer initialiser
1896 */
1897
1898
1899static const struct net_offload ipip_offload = {
1900 .callbacks = {
1901 .gso_segment = ipip_gso_segment,
1902 .gro_receive = ipip_gro_receive,
1903 .gro_complete = ipip_gro_complete,
1904 },
1905};
1906
1907static int __init ipip_offload_init(void)
1908{
1909 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1910}
1911
1912static int __init ipv4_offload_init(void)
1913{
1914 /*
1915 * Add offloads
1916 */
1917 if (udpv4_offload_init() < 0)
1918 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1919 if (tcpv4_offload_init() < 0)
1920 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1921 if (ipip_offload_init() < 0)
1922 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1923
1924 net_hotdata.ip_packet_offload = (struct packet_offload) {
1925 .type = cpu_to_be16(ETH_P_IP),
1926 .callbacks = {
1927 .gso_segment = inet_gso_segment,
1928 .gro_receive = inet_gro_receive,
1929 .gro_complete = inet_gro_complete,
1930 },
1931 };
1932 dev_add_offload(&net_hotdata.ip_packet_offload);
1933 return 0;
1934}
1935
1936fs_initcall(ipv4_offload_init);
1937
1938static struct packet_type ip_packet_type __read_mostly = {
1939 .type = cpu_to_be16(ETH_P_IP),
1940 .func = ip_rcv,
1941 .list_func = ip_list_rcv,
1942};
1943
1944static int __init inet_init(void)
1945{
1946 struct inet_protosw *q;
1947 struct list_head *r;
1948 int rc;
1949
1950 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1951
1952 raw_hashinfo_init(&raw_v4_hashinfo);
1953
1954 rc = proto_register(&tcp_prot, 1);
1955 if (rc)
1956 goto out;
1957
1958 rc = proto_register(&udp_prot, 1);
1959 if (rc)
1960 goto out_unregister_tcp_proto;
1961
1962 rc = proto_register(&raw_prot, 1);
1963 if (rc)
1964 goto out_unregister_udp_proto;
1965
1966 rc = proto_register(&ping_prot, 1);
1967 if (rc)
1968 goto out_unregister_raw_proto;
1969
1970 /*
1971 * Tell SOCKET that we are alive...
1972 */
1973
1974 (void)sock_register(&inet_family_ops);
1975
1976#ifdef CONFIG_SYSCTL
1977 ip_static_sysctl_init();
1978#endif
1979
1980 /*
1981 * Add all the base protocols.
1982 */
1983
1984 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1985 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1986
1987 net_hotdata.udp_protocol = (struct net_protocol) {
1988 .handler = udp_rcv,
1989 .err_handler = udp_err,
1990 .no_policy = 1,
1991 };
1992 if (inet_add_protocol(&net_hotdata.udp_protocol, IPPROTO_UDP) < 0)
1993 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1994
1995 net_hotdata.tcp_protocol = (struct net_protocol) {
1996 .handler = tcp_v4_rcv,
1997 .err_handler = tcp_v4_err,
1998 .no_policy = 1,
1999 .icmp_strict_tag_validation = 1,
2000 };
2001 if (inet_add_protocol(&net_hotdata.tcp_protocol, IPPROTO_TCP) < 0)
2002 pr_crit("%s: Cannot add TCP protocol\n", __func__);
2003#ifdef CONFIG_IP_MULTICAST
2004 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
2005 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
2006#endif
2007
2008 /* Register the socket-side information for inet_create. */
2009 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
2010 INIT_LIST_HEAD(r);
2011
2012 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
2013 inet_register_protosw(q);
2014
2015 /*
2016 * Set the ARP module up
2017 */
2018
2019 arp_init();
2020
2021 /*
2022 * Set the IP module up
2023 */
2024
2025 ip_init();
2026
2027 /* Initialise per-cpu ipv4 mibs */
2028 if (init_ipv4_mibs())
2029 panic("%s: Cannot init ipv4 mibs\n", __func__);
2030
2031 /* Setup TCP slab cache for open requests. */
2032 tcp_init();
2033
2034 /* Setup UDP memory threshold */
2035 udp_init();
2036
2037 /* Add UDP-Lite (RFC 3828) */
2038 udplite4_register();
2039
2040 raw_init();
2041
2042 ping_init();
2043
2044 /*
2045 * Set the ICMP layer up
2046 */
2047
2048 if (icmp_init() < 0)
2049 panic("Failed to create the ICMP control socket.\n");
2050
2051 /*
2052 * Initialise the multicast router
2053 */
2054#if defined(CONFIG_IP_MROUTE)
2055 if (ip_mr_init())
2056 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2057#endif
2058
2059 if (init_inet_pernet_ops())
2060 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2061
2062 ipv4_proc_init();
2063
2064 ipfrag_init();
2065
2066 dev_add_pack(&ip_packet_type);
2067
2068 ip_tunnel_core_init();
2069
2070 rc = 0;
2071out:
2072 return rc;
2073out_unregister_raw_proto:
2074 proto_unregister(&raw_prot);
2075out_unregister_udp_proto:
2076 proto_unregister(&udp_prot);
2077out_unregister_tcp_proto:
2078 proto_unregister(&tcp_prot);
2079 goto out;
2080}
2081
2082fs_initcall(inet_init);
2083
2084/* ------------------------------------------------------------------------ */
2085
2086#ifdef CONFIG_PROC_FS
2087static int __init ipv4_proc_init(void)
2088{
2089 int rc = 0;
2090
2091 if (raw_proc_init())
2092 goto out_raw;
2093 if (tcp4_proc_init())
2094 goto out_tcp;
2095 if (udp4_proc_init())
2096 goto out_udp;
2097 if (ping_proc_init())
2098 goto out_ping;
2099 if (ip_misc_proc_init())
2100 goto out_misc;
2101out:
2102 return rc;
2103out_misc:
2104 ping_proc_exit();
2105out_ping:
2106 udp4_proc_exit();
2107out_udp:
2108 tcp4_proc_exit();
2109out_tcp:
2110 raw_proc_exit();
2111out_raw:
2112 rc = -ENOMEM;
2113 goto out;
2114}
2115
2116#else /* CONFIG_PROC_FS */
2117static int __init ipv4_proc_init(void)
2118{
2119 return 0;
2120}
2121#endif /* CONFIG_PROC_FS */