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Merge tag 'pm-6.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
[thirdparty/kernel/linux.git] / net / ipv4 / af_inet.c
... / ...
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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->sk_forward_alloc);
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 goto out_sk_release;
381 }
382
383 if (sk->sk_prot->init) {
384 err = sk->sk_prot->init(sk);
385 if (err)
386 goto out_sk_release;
387 }
388
389 if (!kern) {
390 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
391 if (err)
392 goto out_sk_release;
393 }
394out:
395 return err;
396out_rcu_unlock:
397 rcu_read_unlock();
398 goto out;
399out_sk_release:
400 sk_common_release(sk);
401 sock->sk = NULL;
402 goto out;
403}
404
405
406/*
407 * The peer socket should always be NULL (or else). When we call this
408 * function we are destroying the object and from then on nobody
409 * should refer to it.
410 */
411int inet_release(struct socket *sock)
412{
413 struct sock *sk = sock->sk;
414
415 if (sk) {
416 long timeout;
417
418 if (!sk->sk_kern_sock)
419 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
420
421 /* Applications forget to leave groups before exiting */
422 ip_mc_drop_socket(sk);
423
424 /* If linger is set, we don't return until the close
425 * is complete. Otherwise we return immediately. The
426 * actually closing is done the same either way.
427 *
428 * If the close is due to the process exiting, we never
429 * linger..
430 */
431 timeout = 0;
432 if (sock_flag(sk, SOCK_LINGER) &&
433 !(current->flags & PF_EXITING))
434 timeout = sk->sk_lingertime;
435 sk->sk_prot->close(sk, timeout);
436 sock->sk = NULL;
437 }
438 return 0;
439}
440EXPORT_SYMBOL(inet_release);
441
442int inet_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
443{
444 u32 flags = BIND_WITH_LOCK;
445 int err;
446
447 /* If the socket has its own bind function then use it. (RAW) */
448 if (sk->sk_prot->bind) {
449 return sk->sk_prot->bind(sk, uaddr, addr_len);
450 }
451 if (addr_len < sizeof(struct sockaddr_in))
452 return -EINVAL;
453
454 /* BPF prog is run before any checks are done so that if the prog
455 * changes context in a wrong way it will be caught.
456 */
457 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
458 CGROUP_INET4_BIND, &flags);
459 if (err)
460 return err;
461
462 return __inet_bind(sk, uaddr, addr_len, flags);
463}
464
465int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
466{
467 return inet_bind_sk(sock->sk, uaddr, addr_len);
468}
469EXPORT_SYMBOL(inet_bind);
470
471int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
472 u32 flags)
473{
474 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
475 struct inet_sock *inet = inet_sk(sk);
476 struct net *net = sock_net(sk);
477 unsigned short snum;
478 int chk_addr_ret;
479 u32 tb_id = RT_TABLE_LOCAL;
480 int err;
481
482 if (addr->sin_family != AF_INET) {
483 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
484 * only if s_addr is INADDR_ANY.
485 */
486 err = -EAFNOSUPPORT;
487 if (addr->sin_family != AF_UNSPEC ||
488 addr->sin_addr.s_addr != htonl(INADDR_ANY))
489 goto out;
490 }
491
492 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
493 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
494
495 /* Not specified by any standard per-se, however it breaks too
496 * many applications when removed. It is unfortunate since
497 * allowing applications to make a non-local bind solves
498 * several problems with systems using dynamic addressing.
499 * (ie. your servers still start up even if your ISDN link
500 * is temporarily down)
501 */
502 err = -EADDRNOTAVAIL;
503 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
504 chk_addr_ret))
505 goto out;
506
507 snum = ntohs(addr->sin_port);
508 err = -EACCES;
509 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
510 snum && inet_port_requires_bind_service(net, snum) &&
511 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
512 goto out;
513
514 /* We keep a pair of addresses. rcv_saddr is the one
515 * used by hash lookups, and saddr is used for transmit.
516 *
517 * In the BSD API these are the same except where it
518 * would be illegal to use them (multicast/broadcast) in
519 * which case the sending device address is used.
520 */
521 if (flags & BIND_WITH_LOCK)
522 lock_sock(sk);
523
524 /* Check these errors (active socket, double bind). */
525 err = -EINVAL;
526 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
527 goto out_release_sock;
528
529 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
530 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
531 inet->inet_saddr = 0; /* Use device */
532
533 /* Make sure we are allowed to bind here. */
534 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
535 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
536 err = sk->sk_prot->get_port(sk, snum);
537 if (err) {
538 inet->inet_saddr = inet->inet_rcv_saddr = 0;
539 goto out_release_sock;
540 }
541 if (!(flags & BIND_FROM_BPF)) {
542 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
543 if (err) {
544 inet->inet_saddr = inet->inet_rcv_saddr = 0;
545 if (sk->sk_prot->put_port)
546 sk->sk_prot->put_port(sk);
547 goto out_release_sock;
548 }
549 }
550 }
551
552 if (inet->inet_rcv_saddr)
553 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
554 if (snum)
555 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
556 inet->inet_sport = htons(inet->inet_num);
557 inet->inet_daddr = 0;
558 inet->inet_dport = 0;
559 sk_dst_reset(sk);
560 err = 0;
561out_release_sock:
562 if (flags & BIND_WITH_LOCK)
563 release_sock(sk);
564out:
565 return err;
566}
567
568int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
569 int addr_len, int flags)
570{
571 struct sock *sk = sock->sk;
572 const struct proto *prot;
573 int err;
574
575 if (addr_len < sizeof(uaddr->sa_family))
576 return -EINVAL;
577
578 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
579 prot = READ_ONCE(sk->sk_prot);
580
581 if (uaddr->sa_family == AF_UNSPEC)
582 return prot->disconnect(sk, flags);
583
584 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
585 err = prot->pre_connect(sk, uaddr, addr_len);
586 if (err)
587 return err;
588 }
589
590 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
591 return -EAGAIN;
592 return prot->connect(sk, uaddr, addr_len);
593}
594EXPORT_SYMBOL(inet_dgram_connect);
595
596static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
597{
598 DEFINE_WAIT_FUNC(wait, woken_wake_function);
599
600 add_wait_queue(sk_sleep(sk), &wait);
601 sk->sk_write_pending += writebias;
602
603 /* Basic assumption: if someone sets sk->sk_err, he _must_
604 * change state of the socket from TCP_SYN_*.
605 * Connect() does not allow to get error notifications
606 * without closing the socket.
607 */
608 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
609 release_sock(sk);
610 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
611 lock_sock(sk);
612 if (signal_pending(current) || !timeo)
613 break;
614 }
615 remove_wait_queue(sk_sleep(sk), &wait);
616 sk->sk_write_pending -= writebias;
617 return timeo;
618}
619
620/*
621 * Connect to a remote host. There is regrettably still a little
622 * TCP 'magic' in here.
623 */
624int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
625 int addr_len, int flags, int is_sendmsg)
626{
627 struct sock *sk = sock->sk;
628 int err;
629 long timeo;
630
631 /*
632 * uaddr can be NULL and addr_len can be 0 if:
633 * sk is a TCP fastopen active socket and
634 * TCP_FASTOPEN_CONNECT sockopt is set and
635 * we already have a valid cookie for this socket.
636 * In this case, user can call write() after connect().
637 * write() will invoke tcp_sendmsg_fastopen() which calls
638 * __inet_stream_connect().
639 */
640 if (uaddr) {
641 if (addr_len < sizeof(uaddr->sa_family))
642 return -EINVAL;
643
644 if (uaddr->sa_family == AF_UNSPEC) {
645 sk->sk_disconnects++;
646 err = sk->sk_prot->disconnect(sk, flags);
647 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
648 goto out;
649 }
650 }
651
652 switch (sock->state) {
653 default:
654 err = -EINVAL;
655 goto out;
656 case SS_CONNECTED:
657 err = -EISCONN;
658 goto out;
659 case SS_CONNECTING:
660 if (inet_test_bit(DEFER_CONNECT, sk))
661 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
662 else
663 err = -EALREADY;
664 /* Fall out of switch with err, set for this state */
665 break;
666 case SS_UNCONNECTED:
667 err = -EISCONN;
668 if (sk->sk_state != TCP_CLOSE)
669 goto out;
670
671 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
672 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
673 if (err)
674 goto out;
675 }
676
677 err = sk->sk_prot->connect(sk, uaddr, addr_len);
678 if (err < 0)
679 goto out;
680
681 sock->state = SS_CONNECTING;
682
683 if (!err && inet_test_bit(DEFER_CONNECT, sk))
684 goto out;
685
686 /* Just entered SS_CONNECTING state; the only
687 * difference is that return value in non-blocking
688 * case is EINPROGRESS, rather than EALREADY.
689 */
690 err = -EINPROGRESS;
691 break;
692 }
693
694 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
695
696 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
697 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
698 tcp_sk(sk)->fastopen_req &&
699 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
700 int dis = sk->sk_disconnects;
701
702 /* Error code is set above */
703 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
704 goto out;
705
706 err = sock_intr_errno(timeo);
707 if (signal_pending(current))
708 goto out;
709
710 if (dis != sk->sk_disconnects) {
711 err = -EPIPE;
712 goto out;
713 }
714 }
715
716 /* Connection was closed by RST, timeout, ICMP error
717 * or another process disconnected us.
718 */
719 if (sk->sk_state == TCP_CLOSE)
720 goto sock_error;
721
722 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
723 * and error was received after socket entered established state.
724 * Hence, it is handled normally after connect() return successfully.
725 */
726
727 sock->state = SS_CONNECTED;
728 err = 0;
729out:
730 return err;
731
732sock_error:
733 err = sock_error(sk) ? : -ECONNABORTED;
734 sock->state = SS_UNCONNECTED;
735 sk->sk_disconnects++;
736 if (sk->sk_prot->disconnect(sk, flags))
737 sock->state = SS_DISCONNECTING;
738 goto out;
739}
740EXPORT_SYMBOL(__inet_stream_connect);
741
742int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
743 int addr_len, int flags)
744{
745 int err;
746
747 lock_sock(sock->sk);
748 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
749 release_sock(sock->sk);
750 return err;
751}
752EXPORT_SYMBOL(inet_stream_connect);
753
754void __inet_accept(struct socket *sock, struct socket *newsock, struct sock *newsk)
755{
756 sock_rps_record_flow(newsk);
757 WARN_ON(!((1 << newsk->sk_state) &
758 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
759 TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 |
760 TCPF_CLOSING | TCPF_CLOSE_WAIT |
761 TCPF_CLOSE)));
762
763 if (test_bit(SOCK_SUPPORT_ZC, &sock->flags))
764 set_bit(SOCK_SUPPORT_ZC, &newsock->flags);
765 sock_graft(newsk, newsock);
766
767 newsock->state = SS_CONNECTED;
768}
769
770/*
771 * Accept a pending connection. The TCP layer now gives BSD semantics.
772 */
773
774int inet_accept(struct socket *sock, struct socket *newsock,
775 struct proto_accept_arg *arg)
776{
777 struct sock *sk1 = sock->sk, *sk2;
778
779 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
780 arg->err = -EINVAL;
781 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, arg);
782 if (!sk2)
783 return arg->err;
784
785 lock_sock(sk2);
786 __inet_accept(sock, newsock, sk2);
787 release_sock(sk2);
788 return 0;
789}
790EXPORT_SYMBOL(inet_accept);
791
792/*
793 * This does both peername and sockname.
794 */
795int inet_getname(struct socket *sock, struct sockaddr *uaddr,
796 int peer)
797{
798 struct sock *sk = sock->sk;
799 struct inet_sock *inet = inet_sk(sk);
800 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
801 int sin_addr_len = sizeof(*sin);
802
803 sin->sin_family = AF_INET;
804 lock_sock(sk);
805 if (peer) {
806 if (!inet->inet_dport ||
807 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
808 peer == 1)) {
809 release_sock(sk);
810 return -ENOTCONN;
811 }
812 sin->sin_port = inet->inet_dport;
813 sin->sin_addr.s_addr = inet->inet_daddr;
814 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
815 CGROUP_INET4_GETPEERNAME);
816 } else {
817 __be32 addr = inet->inet_rcv_saddr;
818 if (!addr)
819 addr = inet->inet_saddr;
820 sin->sin_port = inet->inet_sport;
821 sin->sin_addr.s_addr = addr;
822 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
823 CGROUP_INET4_GETSOCKNAME);
824 }
825 release_sock(sk);
826 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
827 return sin_addr_len;
828}
829EXPORT_SYMBOL(inet_getname);
830
831int inet_send_prepare(struct sock *sk)
832{
833 sock_rps_record_flow(sk);
834
835 /* We may need to bind the socket. */
836 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
837 inet_autobind(sk))
838 return -EAGAIN;
839
840 return 0;
841}
842EXPORT_SYMBOL_GPL(inet_send_prepare);
843
844int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
845{
846 struct sock *sk = sock->sk;
847
848 if (unlikely(inet_send_prepare(sk)))
849 return -EAGAIN;
850
851 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
852 sk, msg, size);
853}
854EXPORT_SYMBOL(inet_sendmsg);
855
856void inet_splice_eof(struct socket *sock)
857{
858 const struct proto *prot;
859 struct sock *sk = sock->sk;
860
861 if (unlikely(inet_send_prepare(sk)))
862 return;
863
864 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
865 prot = READ_ONCE(sk->sk_prot);
866 if (prot->splice_eof)
867 prot->splice_eof(sock);
868}
869EXPORT_SYMBOL_GPL(inet_splice_eof);
870
871INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
872 size_t, int, int *));
873int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
874 int flags)
875{
876 struct sock *sk = sock->sk;
877 int addr_len = 0;
878 int err;
879
880 if (likely(!(flags & MSG_ERRQUEUE)))
881 sock_rps_record_flow(sk);
882
883 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
884 sk, msg, size, flags, &addr_len);
885 if (err >= 0)
886 msg->msg_namelen = addr_len;
887 return err;
888}
889EXPORT_SYMBOL(inet_recvmsg);
890
891int inet_shutdown(struct socket *sock, int how)
892{
893 struct sock *sk = sock->sk;
894 int err = 0;
895
896 /* This should really check to make sure
897 * the socket is a TCP socket. (WHY AC...)
898 */
899 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
900 1->2 bit 2 snds.
901 2->3 */
902 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
903 return -EINVAL;
904
905 lock_sock(sk);
906 if (sock->state == SS_CONNECTING) {
907 if ((1 << sk->sk_state) &
908 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
909 sock->state = SS_DISCONNECTING;
910 else
911 sock->state = SS_CONNECTED;
912 }
913
914 switch (sk->sk_state) {
915 case TCP_CLOSE:
916 err = -ENOTCONN;
917 /* Hack to wake up other listeners, who can poll for
918 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
919 fallthrough;
920 default:
921 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how);
922 if (sk->sk_prot->shutdown)
923 sk->sk_prot->shutdown(sk, how);
924 break;
925
926 /* Remaining two branches are temporary solution for missing
927 * close() in multithreaded environment. It is _not_ a good idea,
928 * but we have no choice until close() is repaired at VFS level.
929 */
930 case TCP_LISTEN:
931 if (!(how & RCV_SHUTDOWN))
932 break;
933 fallthrough;
934 case TCP_SYN_SENT:
935 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
936 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
937 break;
938 }
939
940 /* Wake up anyone sleeping in poll. */
941 sk->sk_state_change(sk);
942 release_sock(sk);
943 return err;
944}
945EXPORT_SYMBOL(inet_shutdown);
946
947/*
948 * ioctl() calls you can issue on an INET socket. Most of these are
949 * device configuration and stuff and very rarely used. Some ioctls
950 * pass on to the socket itself.
951 *
952 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
953 * loads the devconfigure module does its configuring and unloads it.
954 * There's a good 20K of config code hanging around the kernel.
955 */
956
957int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
958{
959 struct sock *sk = sock->sk;
960 int err = 0;
961 struct net *net = sock_net(sk);
962 void __user *p = (void __user *)arg;
963 struct ifreq ifr;
964 struct rtentry rt;
965
966 switch (cmd) {
967 case SIOCADDRT:
968 case SIOCDELRT:
969 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
970 return -EFAULT;
971 err = ip_rt_ioctl(net, cmd, &rt);
972 break;
973 case SIOCRTMSG:
974 err = -EINVAL;
975 break;
976 case SIOCDARP:
977 case SIOCGARP:
978 case SIOCSARP:
979 err = arp_ioctl(net, cmd, (void __user *)arg);
980 break;
981 case SIOCGIFADDR:
982 case SIOCGIFBRDADDR:
983 case SIOCGIFNETMASK:
984 case SIOCGIFDSTADDR:
985 case SIOCGIFPFLAGS:
986 if (get_user_ifreq(&ifr, NULL, p))
987 return -EFAULT;
988 err = devinet_ioctl(net, cmd, &ifr);
989 if (!err && put_user_ifreq(&ifr, p))
990 err = -EFAULT;
991 break;
992
993 case SIOCSIFADDR:
994 case SIOCSIFBRDADDR:
995 case SIOCSIFNETMASK:
996 case SIOCSIFDSTADDR:
997 case SIOCSIFPFLAGS:
998 case SIOCSIFFLAGS:
999 if (get_user_ifreq(&ifr, NULL, p))
1000 return -EFAULT;
1001 err = devinet_ioctl(net, cmd, &ifr);
1002 break;
1003 default:
1004 if (sk->sk_prot->ioctl)
1005 err = sk_ioctl(sk, cmd, (void __user *)arg);
1006 else
1007 err = -ENOIOCTLCMD;
1008 break;
1009 }
1010 return err;
1011}
1012EXPORT_SYMBOL(inet_ioctl);
1013
1014#ifdef CONFIG_COMPAT
1015static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
1016 struct compat_rtentry __user *ur)
1017{
1018 compat_uptr_t rtdev;
1019 struct rtentry rt;
1020
1021 if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
1022 3 * sizeof(struct sockaddr)) ||
1023 get_user(rt.rt_flags, &ur->rt_flags) ||
1024 get_user(rt.rt_metric, &ur->rt_metric) ||
1025 get_user(rt.rt_mtu, &ur->rt_mtu) ||
1026 get_user(rt.rt_window, &ur->rt_window) ||
1027 get_user(rt.rt_irtt, &ur->rt_irtt) ||
1028 get_user(rtdev, &ur->rt_dev))
1029 return -EFAULT;
1030
1031 rt.rt_dev = compat_ptr(rtdev);
1032 return ip_rt_ioctl(sock_net(sk), cmd, &rt);
1033}
1034
1035static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1036{
1037 void __user *argp = compat_ptr(arg);
1038 struct sock *sk = sock->sk;
1039
1040 switch (cmd) {
1041 case SIOCADDRT:
1042 case SIOCDELRT:
1043 return inet_compat_routing_ioctl(sk, cmd, argp);
1044 default:
1045 if (!sk->sk_prot->compat_ioctl)
1046 return -ENOIOCTLCMD;
1047 return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1048 }
1049}
1050#endif /* CONFIG_COMPAT */
1051
1052const struct proto_ops inet_stream_ops = {
1053 .family = PF_INET,
1054 .owner = THIS_MODULE,
1055 .release = inet_release,
1056 .bind = inet_bind,
1057 .connect = inet_stream_connect,
1058 .socketpair = sock_no_socketpair,
1059 .accept = inet_accept,
1060 .getname = inet_getname,
1061 .poll = tcp_poll,
1062 .ioctl = inet_ioctl,
1063 .gettstamp = sock_gettstamp,
1064 .listen = inet_listen,
1065 .shutdown = inet_shutdown,
1066 .setsockopt = sock_common_setsockopt,
1067 .getsockopt = sock_common_getsockopt,
1068 .sendmsg = inet_sendmsg,
1069 .recvmsg = inet_recvmsg,
1070#ifdef CONFIG_MMU
1071 .mmap = tcp_mmap,
1072#endif
1073 .splice_eof = inet_splice_eof,
1074 .splice_read = tcp_splice_read,
1075 .set_peek_off = sk_set_peek_off,
1076 .read_sock = tcp_read_sock,
1077 .read_skb = tcp_read_skb,
1078 .sendmsg_locked = tcp_sendmsg_locked,
1079 .peek_len = tcp_peek_len,
1080#ifdef CONFIG_COMPAT
1081 .compat_ioctl = inet_compat_ioctl,
1082#endif
1083 .set_rcvlowat = tcp_set_rcvlowat,
1084};
1085EXPORT_SYMBOL(inet_stream_ops);
1086
1087const struct proto_ops inet_dgram_ops = {
1088 .family = PF_INET,
1089 .owner = THIS_MODULE,
1090 .release = inet_release,
1091 .bind = inet_bind,
1092 .connect = inet_dgram_connect,
1093 .socketpair = sock_no_socketpair,
1094 .accept = sock_no_accept,
1095 .getname = inet_getname,
1096 .poll = udp_poll,
1097 .ioctl = inet_ioctl,
1098 .gettstamp = sock_gettstamp,
1099 .listen = sock_no_listen,
1100 .shutdown = inet_shutdown,
1101 .setsockopt = sock_common_setsockopt,
1102 .getsockopt = sock_common_getsockopt,
1103 .sendmsg = inet_sendmsg,
1104 .read_skb = udp_read_skb,
1105 .recvmsg = inet_recvmsg,
1106 .mmap = sock_no_mmap,
1107 .splice_eof = inet_splice_eof,
1108 .set_peek_off = udp_set_peek_off,
1109#ifdef CONFIG_COMPAT
1110 .compat_ioctl = inet_compat_ioctl,
1111#endif
1112};
1113EXPORT_SYMBOL(inet_dgram_ops);
1114
1115/*
1116 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1117 * udp_poll
1118 */
1119static const struct proto_ops inet_sockraw_ops = {
1120 .family = PF_INET,
1121 .owner = THIS_MODULE,
1122 .release = inet_release,
1123 .bind = inet_bind,
1124 .connect = inet_dgram_connect,
1125 .socketpair = sock_no_socketpair,
1126 .accept = sock_no_accept,
1127 .getname = inet_getname,
1128 .poll = datagram_poll,
1129 .ioctl = inet_ioctl,
1130 .gettstamp = sock_gettstamp,
1131 .listen = sock_no_listen,
1132 .shutdown = inet_shutdown,
1133 .setsockopt = sock_common_setsockopt,
1134 .getsockopt = sock_common_getsockopt,
1135 .sendmsg = inet_sendmsg,
1136 .recvmsg = inet_recvmsg,
1137 .mmap = sock_no_mmap,
1138 .splice_eof = inet_splice_eof,
1139#ifdef CONFIG_COMPAT
1140 .compat_ioctl = inet_compat_ioctl,
1141#endif
1142};
1143
1144static const struct net_proto_family inet_family_ops = {
1145 .family = PF_INET,
1146 .create = inet_create,
1147 .owner = THIS_MODULE,
1148};
1149
1150/* Upon startup we insert all the elements in inetsw_array[] into
1151 * the linked list inetsw.
1152 */
1153static struct inet_protosw inetsw_array[] =
1154{
1155 {
1156 .type = SOCK_STREAM,
1157 .protocol = IPPROTO_TCP,
1158 .prot = &tcp_prot,
1159 .ops = &inet_stream_ops,
1160 .flags = INET_PROTOSW_PERMANENT |
1161 INET_PROTOSW_ICSK,
1162 },
1163
1164 {
1165 .type = SOCK_DGRAM,
1166 .protocol = IPPROTO_UDP,
1167 .prot = &udp_prot,
1168 .ops = &inet_dgram_ops,
1169 .flags = INET_PROTOSW_PERMANENT,
1170 },
1171
1172 {
1173 .type = SOCK_DGRAM,
1174 .protocol = IPPROTO_ICMP,
1175 .prot = &ping_prot,
1176 .ops = &inet_sockraw_ops,
1177 .flags = INET_PROTOSW_REUSE,
1178 },
1179
1180 {
1181 .type = SOCK_RAW,
1182 .protocol = IPPROTO_IP, /* wild card */
1183 .prot = &raw_prot,
1184 .ops = &inet_sockraw_ops,
1185 .flags = INET_PROTOSW_REUSE,
1186 }
1187};
1188
1189#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1190
1191void inet_register_protosw(struct inet_protosw *p)
1192{
1193 struct list_head *lh;
1194 struct inet_protosw *answer;
1195 int protocol = p->protocol;
1196 struct list_head *last_perm;
1197
1198 spin_lock_bh(&inetsw_lock);
1199
1200 if (p->type >= SOCK_MAX)
1201 goto out_illegal;
1202
1203 /* If we are trying to override a permanent protocol, bail. */
1204 last_perm = &inetsw[p->type];
1205 list_for_each(lh, &inetsw[p->type]) {
1206 answer = list_entry(lh, struct inet_protosw, list);
1207 /* Check only the non-wild match. */
1208 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1209 break;
1210 if (protocol == answer->protocol)
1211 goto out_permanent;
1212 last_perm = lh;
1213 }
1214
1215 /* Add the new entry after the last permanent entry if any, so that
1216 * the new entry does not override a permanent entry when matched with
1217 * a wild-card protocol. But it is allowed to override any existing
1218 * non-permanent entry. This means that when we remove this entry, the
1219 * system automatically returns to the old behavior.
1220 */
1221 list_add_rcu(&p->list, last_perm);
1222out:
1223 spin_unlock_bh(&inetsw_lock);
1224
1225 return;
1226
1227out_permanent:
1228 pr_err("Attempt to override permanent protocol %d\n", protocol);
1229 goto out;
1230
1231out_illegal:
1232 pr_err("Ignoring attempt to register invalid socket type %d\n",
1233 p->type);
1234 goto out;
1235}
1236EXPORT_SYMBOL(inet_register_protosw);
1237
1238void inet_unregister_protosw(struct inet_protosw *p)
1239{
1240 if (INET_PROTOSW_PERMANENT & p->flags) {
1241 pr_err("Attempt to unregister permanent protocol %d\n",
1242 p->protocol);
1243 } else {
1244 spin_lock_bh(&inetsw_lock);
1245 list_del_rcu(&p->list);
1246 spin_unlock_bh(&inetsw_lock);
1247
1248 synchronize_net();
1249 }
1250}
1251EXPORT_SYMBOL(inet_unregister_protosw);
1252
1253static int inet_sk_reselect_saddr(struct sock *sk)
1254{
1255 struct inet_sock *inet = inet_sk(sk);
1256 __be32 old_saddr = inet->inet_saddr;
1257 __be32 daddr = inet->inet_daddr;
1258 struct flowi4 *fl4;
1259 struct rtable *rt;
1260 __be32 new_saddr;
1261 struct ip_options_rcu *inet_opt;
1262 int err;
1263
1264 inet_opt = rcu_dereference_protected(inet->inet_opt,
1265 lockdep_sock_is_held(sk));
1266 if (inet_opt && inet_opt->opt.srr)
1267 daddr = inet_opt->opt.faddr;
1268
1269 /* Query new route. */
1270 fl4 = &inet->cork.fl.u.ip4;
1271 rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if,
1272 sk->sk_protocol, inet->inet_sport,
1273 inet->inet_dport, sk);
1274 if (IS_ERR(rt))
1275 return PTR_ERR(rt);
1276
1277 new_saddr = fl4->saddr;
1278
1279 if (new_saddr == old_saddr) {
1280 sk_setup_caps(sk, &rt->dst);
1281 return 0;
1282 }
1283
1284 err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET);
1285 if (err) {
1286 ip_rt_put(rt);
1287 return err;
1288 }
1289
1290 sk_setup_caps(sk, &rt->dst);
1291
1292 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1293 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1294 __func__, &old_saddr, &new_saddr);
1295 }
1296
1297 /*
1298 * XXX The only one ugly spot where we need to
1299 * XXX really change the sockets identity after
1300 * XXX it has entered the hashes. -DaveM
1301 *
1302 * Besides that, it does not check for connection
1303 * uniqueness. Wait for troubles.
1304 */
1305 return __sk_prot_rehash(sk);
1306}
1307
1308int inet_sk_rebuild_header(struct sock *sk)
1309{
1310 struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0));
1311 struct inet_sock *inet = inet_sk(sk);
1312 struct flowi4 *fl4;
1313 int err;
1314
1315 /* Route is OK, nothing to do. */
1316 if (rt)
1317 return 0;
1318
1319 /* Reroute. */
1320 fl4 = &inet->cork.fl.u.ip4;
1321 inet_sk_init_flowi4(inet, fl4);
1322 rt = ip_route_output_flow(sock_net(sk), fl4, sk);
1323 if (!IS_ERR(rt)) {
1324 err = 0;
1325 sk_setup_caps(sk, &rt->dst);
1326 } else {
1327 err = PTR_ERR(rt);
1328
1329 /* Routing failed... */
1330 sk->sk_route_caps = 0;
1331
1332 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1333 sk->sk_state != TCP_SYN_SENT ||
1334 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1335 (err = inet_sk_reselect_saddr(sk)) != 0)
1336 WRITE_ONCE(sk->sk_err_soft, -err);
1337 }
1338
1339 return err;
1340}
1341EXPORT_SYMBOL(inet_sk_rebuild_header);
1342
1343void inet_sk_set_state(struct sock *sk, int state)
1344{
1345 trace_inet_sock_set_state(sk, sk->sk_state, state);
1346 sk->sk_state = state;
1347}
1348EXPORT_SYMBOL(inet_sk_set_state);
1349
1350void inet_sk_state_store(struct sock *sk, int newstate)
1351{
1352 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1353 smp_store_release(&sk->sk_state, newstate);
1354}
1355
1356struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1357 netdev_features_t features)
1358{
1359 bool udpfrag = false, fixedid = false, gso_partial, encap;
1360 struct sk_buff *segs = ERR_PTR(-EINVAL);
1361 const struct net_offload *ops;
1362 unsigned int offset = 0;
1363 struct iphdr *iph;
1364 int proto, tot_len;
1365 int nhoff;
1366 int ihl;
1367 int id;
1368
1369 skb_reset_network_header(skb);
1370 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1371 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1372 goto out;
1373
1374 iph = ip_hdr(skb);
1375 ihl = iph->ihl * 4;
1376 if (ihl < sizeof(*iph))
1377 goto out;
1378
1379 id = ntohs(iph->id);
1380 proto = iph->protocol;
1381
1382 /* Warning: after this point, iph might be no longer valid */
1383 if (unlikely(!pskb_may_pull(skb, ihl)))
1384 goto out;
1385 __skb_pull(skb, ihl);
1386
1387 encap = SKB_GSO_CB(skb)->encap_level > 0;
1388 if (encap)
1389 features &= skb->dev->hw_enc_features;
1390 SKB_GSO_CB(skb)->encap_level += ihl;
1391
1392 skb_reset_transport_header(skb);
1393
1394 segs = ERR_PTR(-EPROTONOSUPPORT);
1395
1396 if (!skb->encapsulation || encap) {
1397 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1398 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1399
1400 /* fixed ID is invalid if DF bit is not set */
1401 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1402 goto out;
1403 }
1404
1405 ops = rcu_dereference(inet_offloads[proto]);
1406 if (likely(ops && ops->callbacks.gso_segment)) {
1407 segs = ops->callbacks.gso_segment(skb, features);
1408 if (!segs)
1409 skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1410 }
1411
1412 if (IS_ERR_OR_NULL(segs))
1413 goto out;
1414
1415 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1416
1417 skb = segs;
1418 do {
1419 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1420 if (udpfrag) {
1421 iph->frag_off = htons(offset >> 3);
1422 if (skb->next)
1423 iph->frag_off |= htons(IP_MF);
1424 offset += skb->len - nhoff - ihl;
1425 tot_len = skb->len - nhoff;
1426 } else if (skb_is_gso(skb)) {
1427 if (!fixedid) {
1428 iph->id = htons(id);
1429 id += skb_shinfo(skb)->gso_segs;
1430 }
1431
1432 if (gso_partial)
1433 tot_len = skb_shinfo(skb)->gso_size +
1434 SKB_GSO_CB(skb)->data_offset +
1435 skb->head - (unsigned char *)iph;
1436 else
1437 tot_len = skb->len - nhoff;
1438 } else {
1439 if (!fixedid)
1440 iph->id = htons(id++);
1441 tot_len = skb->len - nhoff;
1442 }
1443 iph->tot_len = htons(tot_len);
1444 ip_send_check(iph);
1445 if (encap)
1446 skb_reset_inner_headers(skb);
1447 skb->network_header = (u8 *)iph - skb->head;
1448 skb_reset_mac_len(skb);
1449 } while ((skb = skb->next));
1450
1451out:
1452 return segs;
1453}
1454
1455static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1456 netdev_features_t features)
1457{
1458 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1459 return ERR_PTR(-EINVAL);
1460
1461 return inet_gso_segment(skb, features);
1462}
1463
1464struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1465{
1466 const struct net_offload *ops;
1467 struct sk_buff *pp = NULL;
1468 const struct iphdr *iph;
1469 struct sk_buff *p;
1470 unsigned int hlen;
1471 unsigned int off;
1472 int flush = 1;
1473 int proto;
1474
1475 off = skb_gro_offset(skb);
1476 hlen = off + sizeof(*iph);
1477 iph = skb_gro_header(skb, hlen, off);
1478 if (unlikely(!iph))
1479 goto out;
1480
1481 proto = iph->protocol;
1482
1483 ops = rcu_dereference(inet_offloads[proto]);
1484 if (!ops || !ops->callbacks.gro_receive)
1485 goto out;
1486
1487 if (*(u8 *)iph != 0x45)
1488 goto out;
1489
1490 if (ip_is_fragment(iph))
1491 goto out;
1492
1493 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1494 goto out;
1495
1496 NAPI_GRO_CB(skb)->proto = proto;
1497 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (ntohl(*(__be32 *)&iph->id) & ~IP_DF));
1498
1499 list_for_each_entry(p, head, list) {
1500 struct iphdr *iph2;
1501
1502 if (!NAPI_GRO_CB(p)->same_flow)
1503 continue;
1504
1505 iph2 = (struct iphdr *)(p->data + off);
1506 /* The above works because, with the exception of the top
1507 * (inner most) layer, we only aggregate pkts with the same
1508 * hdr length so all the hdrs we'll need to verify will start
1509 * at the same offset.
1510 */
1511 if ((iph->protocol ^ iph2->protocol) |
1512 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1513 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1514 NAPI_GRO_CB(p)->same_flow = 0;
1515 continue;
1516 }
1517 }
1518
1519 NAPI_GRO_CB(skb)->flush |= flush;
1520 NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = off;
1521
1522 /* Note : No need to call skb_gro_postpull_rcsum() here,
1523 * as we already checked checksum over ipv4 header was 0
1524 */
1525 skb_gro_pull(skb, sizeof(*iph));
1526 skb_set_transport_header(skb, skb_gro_offset(skb));
1527
1528 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1529 ops->callbacks.gro_receive, head, skb);
1530
1531out:
1532 skb_gro_flush_final(skb, pp, flush);
1533
1534 return pp;
1535}
1536
1537static struct sk_buff *ipip_gro_receive(struct list_head *head,
1538 struct sk_buff *skb)
1539{
1540 if (NAPI_GRO_CB(skb)->encap_mark) {
1541 NAPI_GRO_CB(skb)->flush = 1;
1542 return NULL;
1543 }
1544
1545 NAPI_GRO_CB(skb)->encap_mark = 1;
1546
1547 return inet_gro_receive(head, skb);
1548}
1549
1550#define SECONDS_PER_DAY 86400
1551
1552/* inet_current_timestamp - Return IP network timestamp
1553 *
1554 * Return milliseconds since midnight in network byte order.
1555 */
1556__be32 inet_current_timestamp(void)
1557{
1558 u32 secs;
1559 u32 msecs;
1560 struct timespec64 ts;
1561
1562 ktime_get_real_ts64(&ts);
1563
1564 /* Get secs since midnight. */
1565 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1566 /* Convert to msecs. */
1567 msecs = secs * MSEC_PER_SEC;
1568 /* Convert nsec to msec. */
1569 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1570
1571 /* Convert to network byte order. */
1572 return htonl(msecs);
1573}
1574EXPORT_SYMBOL(inet_current_timestamp);
1575
1576int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1577{
1578 unsigned int family = READ_ONCE(sk->sk_family);
1579
1580 if (family == AF_INET)
1581 return ip_recv_error(sk, msg, len, addr_len);
1582#if IS_ENABLED(CONFIG_IPV6)
1583 if (family == AF_INET6)
1584 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1585#endif
1586 return -EINVAL;
1587}
1588EXPORT_SYMBOL(inet_recv_error);
1589
1590int inet_gro_complete(struct sk_buff *skb, int nhoff)
1591{
1592 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1593 const struct net_offload *ops;
1594 __be16 totlen = iph->tot_len;
1595 int proto = iph->protocol;
1596 int err = -ENOSYS;
1597
1598 if (skb->encapsulation) {
1599 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1600 skb_set_inner_network_header(skb, nhoff);
1601 }
1602
1603 iph_set_totlen(iph, skb->len - nhoff);
1604 csum_replace2(&iph->check, totlen, iph->tot_len);
1605
1606 ops = rcu_dereference(inet_offloads[proto]);
1607 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1608 goto out;
1609
1610 /* Only need to add sizeof(*iph) to get to the next hdr below
1611 * because any hdr with option will have been flushed in
1612 * inet_gro_receive().
1613 */
1614 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1615 tcp4_gro_complete, udp4_gro_complete,
1616 skb, nhoff + sizeof(*iph));
1617
1618out:
1619 return err;
1620}
1621
1622static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1623{
1624 skb->encapsulation = 1;
1625 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1626 return inet_gro_complete(skb, nhoff);
1627}
1628
1629int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1630 unsigned short type, unsigned char protocol,
1631 struct net *net)
1632{
1633 struct socket *sock;
1634 int rc = sock_create_kern(net, family, type, protocol, &sock);
1635
1636 if (rc == 0) {
1637 *sk = sock->sk;
1638 (*sk)->sk_allocation = GFP_ATOMIC;
1639 (*sk)->sk_use_task_frag = false;
1640 /*
1641 * Unhash it so that IP input processing does not even see it,
1642 * we do not wish this socket to see incoming packets.
1643 */
1644 (*sk)->sk_prot->unhash(*sk);
1645 }
1646 return rc;
1647}
1648EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1649
1650unsigned long snmp_fold_field(void __percpu *mib, int offt)
1651{
1652 unsigned long res = 0;
1653 int i;
1654
1655 for_each_possible_cpu(i)
1656 res += snmp_get_cpu_field(mib, i, offt);
1657 return res;
1658}
1659EXPORT_SYMBOL_GPL(snmp_fold_field);
1660
1661#if BITS_PER_LONG==32
1662
1663u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1664 size_t syncp_offset)
1665{
1666 void *bhptr;
1667 struct u64_stats_sync *syncp;
1668 u64 v;
1669 unsigned int start;
1670
1671 bhptr = per_cpu_ptr(mib, cpu);
1672 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1673 do {
1674 start = u64_stats_fetch_begin(syncp);
1675 v = *(((u64 *)bhptr) + offt);
1676 } while (u64_stats_fetch_retry(syncp, start));
1677
1678 return v;
1679}
1680EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1681
1682u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1683{
1684 u64 res = 0;
1685 int cpu;
1686
1687 for_each_possible_cpu(cpu) {
1688 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1689 }
1690 return res;
1691}
1692EXPORT_SYMBOL_GPL(snmp_fold_field64);
1693#endif
1694
1695#ifdef CONFIG_IP_MULTICAST
1696static const struct net_protocol igmp_protocol = {
1697 .handler = igmp_rcv,
1698};
1699#endif
1700
1701static const struct net_protocol icmp_protocol = {
1702 .handler = icmp_rcv,
1703 .err_handler = icmp_err,
1704 .no_policy = 1,
1705};
1706
1707static __net_init int ipv4_mib_init_net(struct net *net)
1708{
1709 int i;
1710
1711 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1712 if (!net->mib.tcp_statistics)
1713 goto err_tcp_mib;
1714 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1715 if (!net->mib.ip_statistics)
1716 goto err_ip_mib;
1717
1718 for_each_possible_cpu(i) {
1719 struct ipstats_mib *af_inet_stats;
1720 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1721 u64_stats_init(&af_inet_stats->syncp);
1722 }
1723
1724 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1725 if (!net->mib.net_statistics)
1726 goto err_net_mib;
1727 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1728 if (!net->mib.udp_statistics)
1729 goto err_udp_mib;
1730 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1731 if (!net->mib.udplite_statistics)
1732 goto err_udplite_mib;
1733 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1734 if (!net->mib.icmp_statistics)
1735 goto err_icmp_mib;
1736 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1737 GFP_KERNEL);
1738 if (!net->mib.icmpmsg_statistics)
1739 goto err_icmpmsg_mib;
1740
1741 tcp_mib_init(net);
1742 return 0;
1743
1744err_icmpmsg_mib:
1745 free_percpu(net->mib.icmp_statistics);
1746err_icmp_mib:
1747 free_percpu(net->mib.udplite_statistics);
1748err_udplite_mib:
1749 free_percpu(net->mib.udp_statistics);
1750err_udp_mib:
1751 free_percpu(net->mib.net_statistics);
1752err_net_mib:
1753 free_percpu(net->mib.ip_statistics);
1754err_ip_mib:
1755 free_percpu(net->mib.tcp_statistics);
1756err_tcp_mib:
1757 return -ENOMEM;
1758}
1759
1760static __net_exit void ipv4_mib_exit_net(struct net *net)
1761{
1762 kfree(net->mib.icmpmsg_statistics);
1763 free_percpu(net->mib.icmp_statistics);
1764 free_percpu(net->mib.udplite_statistics);
1765 free_percpu(net->mib.udp_statistics);
1766 free_percpu(net->mib.net_statistics);
1767 free_percpu(net->mib.ip_statistics);
1768 free_percpu(net->mib.tcp_statistics);
1769#ifdef CONFIG_MPTCP
1770 /* allocated on demand, see mptcp_init_sock() */
1771 free_percpu(net->mib.mptcp_statistics);
1772#endif
1773}
1774
1775static __net_initdata struct pernet_operations ipv4_mib_ops = {
1776 .init = ipv4_mib_init_net,
1777 .exit = ipv4_mib_exit_net,
1778};
1779
1780static int __init init_ipv4_mibs(void)
1781{
1782 return register_pernet_subsys(&ipv4_mib_ops);
1783}
1784
1785static __net_init int inet_init_net(struct net *net)
1786{
1787 /*
1788 * Set defaults for local port range
1789 */
1790 net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u;
1791
1792 seqlock_init(&net->ipv4.ping_group_range.lock);
1793 /*
1794 * Sane defaults - nobody may create ping sockets.
1795 * Boot scripts should set this to distro-specific group.
1796 */
1797 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1798 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1799
1800 /* Default values for sysctl-controlled parameters.
1801 * We set them here, in case sysctl is not compiled.
1802 */
1803 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1804 net->ipv4.sysctl_ip_fwd_update_priority = 1;
1805 net->ipv4.sysctl_ip_dynaddr = 0;
1806 net->ipv4.sysctl_ip_early_demux = 1;
1807 net->ipv4.sysctl_udp_early_demux = 1;
1808 net->ipv4.sysctl_tcp_early_demux = 1;
1809 net->ipv4.sysctl_nexthop_compat_mode = 1;
1810#ifdef CONFIG_SYSCTL
1811 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1812#endif
1813
1814 /* Some igmp sysctl, whose values are always used */
1815 net->ipv4.sysctl_igmp_max_memberships = 20;
1816 net->ipv4.sysctl_igmp_max_msf = 10;
1817 /* IGMP reports for link-local multicast groups are enabled by default */
1818 net->ipv4.sysctl_igmp_llm_reports = 1;
1819 net->ipv4.sysctl_igmp_qrv = 2;
1820
1821 net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1822
1823 return 0;
1824}
1825
1826static __net_initdata struct pernet_operations af_inet_ops = {
1827 .init = inet_init_net,
1828};
1829
1830static int __init init_inet_pernet_ops(void)
1831{
1832 return register_pernet_subsys(&af_inet_ops);
1833}
1834
1835static int ipv4_proc_init(void);
1836
1837/*
1838 * IP protocol layer initialiser
1839 */
1840
1841
1842static const struct net_offload ipip_offload = {
1843 .callbacks = {
1844 .gso_segment = ipip_gso_segment,
1845 .gro_receive = ipip_gro_receive,
1846 .gro_complete = ipip_gro_complete,
1847 },
1848};
1849
1850static int __init ipip_offload_init(void)
1851{
1852 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1853}
1854
1855static int __init ipv4_offload_init(void)
1856{
1857 /*
1858 * Add offloads
1859 */
1860 if (udpv4_offload_init() < 0)
1861 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1862 if (tcpv4_offload_init() < 0)
1863 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1864 if (ipip_offload_init() < 0)
1865 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1866
1867 net_hotdata.ip_packet_offload = (struct packet_offload) {
1868 .type = cpu_to_be16(ETH_P_IP),
1869 .callbacks = {
1870 .gso_segment = inet_gso_segment,
1871 .gro_receive = inet_gro_receive,
1872 .gro_complete = inet_gro_complete,
1873 },
1874 };
1875 dev_add_offload(&net_hotdata.ip_packet_offload);
1876 return 0;
1877}
1878
1879fs_initcall(ipv4_offload_init);
1880
1881static struct packet_type ip_packet_type __read_mostly = {
1882 .type = cpu_to_be16(ETH_P_IP),
1883 .func = ip_rcv,
1884 .list_func = ip_list_rcv,
1885};
1886
1887static int __init inet_init(void)
1888{
1889 struct inet_protosw *q;
1890 struct list_head *r;
1891 int rc;
1892
1893 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1894
1895 raw_hashinfo_init(&raw_v4_hashinfo);
1896
1897 rc = proto_register(&tcp_prot, 1);
1898 if (rc)
1899 goto out;
1900
1901 rc = proto_register(&udp_prot, 1);
1902 if (rc)
1903 goto out_unregister_tcp_proto;
1904
1905 rc = proto_register(&raw_prot, 1);
1906 if (rc)
1907 goto out_unregister_udp_proto;
1908
1909 rc = proto_register(&ping_prot, 1);
1910 if (rc)
1911 goto out_unregister_raw_proto;
1912
1913 /*
1914 * Tell SOCKET that we are alive...
1915 */
1916
1917 (void)sock_register(&inet_family_ops);
1918
1919#ifdef CONFIG_SYSCTL
1920 ip_static_sysctl_init();
1921#endif
1922
1923 /*
1924 * Add all the base protocols.
1925 */
1926
1927 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1928 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1929
1930 net_hotdata.udp_protocol = (struct net_protocol) {
1931 .handler = udp_rcv,
1932 .err_handler = udp_err,
1933 .no_policy = 1,
1934 };
1935 if (inet_add_protocol(&net_hotdata.udp_protocol, IPPROTO_UDP) < 0)
1936 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1937
1938 net_hotdata.tcp_protocol = (struct net_protocol) {
1939 .handler = tcp_v4_rcv,
1940 .err_handler = tcp_v4_err,
1941 .no_policy = 1,
1942 .icmp_strict_tag_validation = 1,
1943 };
1944 if (inet_add_protocol(&net_hotdata.tcp_protocol, IPPROTO_TCP) < 0)
1945 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1946#ifdef CONFIG_IP_MULTICAST
1947 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1948 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1949#endif
1950
1951 /* Register the socket-side information for inet_create. */
1952 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1953 INIT_LIST_HEAD(r);
1954
1955 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1956 inet_register_protosw(q);
1957
1958 /*
1959 * Set the ARP module up
1960 */
1961
1962 arp_init();
1963
1964 /*
1965 * Set the IP module up
1966 */
1967
1968 ip_init();
1969
1970 /* Initialise per-cpu ipv4 mibs */
1971 if (init_ipv4_mibs())
1972 panic("%s: Cannot init ipv4 mibs\n", __func__);
1973
1974 /* Setup TCP slab cache for open requests. */
1975 tcp_init();
1976
1977 /* Setup UDP memory threshold */
1978 udp_init();
1979
1980 /* Add UDP-Lite (RFC 3828) */
1981 udplite4_register();
1982
1983 raw_init();
1984
1985 ping_init();
1986
1987 /*
1988 * Set the ICMP layer up
1989 */
1990
1991 if (icmp_init() < 0)
1992 panic("Failed to create the ICMP control socket.\n");
1993
1994 /*
1995 * Initialise the multicast router
1996 */
1997#if defined(CONFIG_IP_MROUTE)
1998 if (ip_mr_init())
1999 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2000#endif
2001
2002 if (init_inet_pernet_ops())
2003 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2004
2005 ipv4_proc_init();
2006
2007 ipfrag_init();
2008
2009 dev_add_pack(&ip_packet_type);
2010
2011 ip_tunnel_core_init();
2012
2013 rc = 0;
2014out:
2015 return rc;
2016out_unregister_raw_proto:
2017 proto_unregister(&raw_prot);
2018out_unregister_udp_proto:
2019 proto_unregister(&udp_prot);
2020out_unregister_tcp_proto:
2021 proto_unregister(&tcp_prot);
2022 goto out;
2023}
2024
2025fs_initcall(inet_init);
2026
2027/* ------------------------------------------------------------------------ */
2028
2029#ifdef CONFIG_PROC_FS
2030static int __init ipv4_proc_init(void)
2031{
2032 int rc = 0;
2033
2034 if (raw_proc_init())
2035 goto out_raw;
2036 if (tcp4_proc_init())
2037 goto out_tcp;
2038 if (udp4_proc_init())
2039 goto out_udp;
2040 if (ping_proc_init())
2041 goto out_ping;
2042 if (ip_misc_proc_init())
2043 goto out_misc;
2044out:
2045 return rc;
2046out_misc:
2047 ping_proc_exit();
2048out_ping:
2049 udp4_proc_exit();
2050out_udp:
2051 tcp4_proc_exit();
2052out_tcp:
2053 raw_proc_exit();
2054out_raw:
2055 rc = -ENOMEM;
2056 goto out;
2057}
2058
2059#else /* CONFIG_PROC_FS */
2060static int __init ipv4_proc_init(void)
2061{
2062 return 0;
2063}
2064#endif /* CONFIG_PROC_FS */
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