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/psp.h>
106#include <net/udp.h>
107#include <net/udplite.h>
108#include <net/ping.h>
109#include <linux/skbuff.h>
110#include <net/sock.h>
111#include <net/raw.h>
112#include <net/icmp.h>
113#include <net/inet_common.h>
114#include <net/ip_tunnels.h>
115#include <net/xfrm.h>
116#include <net/net_namespace.h>
117#include <net/secure_seq.h>
118#ifdef CONFIG_IP_MROUTE
119#include <linux/mroute.h>
120#endif
121#include <net/l3mdev.h>
122#include <net/compat.h>
123#include <net/rps.h>
124
125#include <trace/events/sock.h>
126
127/* The inetsw table contains everything that inet_create needs to
128 * build a new socket.
129 */
130static struct list_head inetsw[SOCK_MAX];
131static DEFINE_SPINLOCK(inetsw_lock);
132
133/* New destruction routine */
134
135void inet_sock_destruct(struct sock *sk)
136{
137 struct inet_sock *inet = inet_sk(sk);
138
139 __skb_queue_purge(list: &sk->sk_receive_queue);
140 __skb_queue_purge(list: &sk->sk_error_queue);
141
142 sk_mem_reclaim_final(sk);
143
144 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
145 pr_err("Attempt to release TCP socket in state %d %p\n",
146 sk->sk_state, sk);
147 return;
148 }
149 if (!sock_flag(sk, flag: SOCK_DEAD)) {
150 pr_err("Attempt to release alive inet socket %p\n", sk);
151 return;
152 }
153
154 WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc));
155 WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc));
156 WARN_ON_ONCE(sk->sk_wmem_queued);
157 WARN_ON_ONCE(sk->sk_forward_alloc);
158
159 kfree(rcu_dereference_protected(inet->inet_opt, 1));
160 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
161 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1));
162 psp_sk_assoc_free(sk);
163}
164EXPORT_SYMBOL(inet_sock_destruct);
165
166/*
167 * The routines beyond this point handle the behaviour of an AF_INET
168 * socket object. Mostly it punts to the subprotocols of IP to do
169 * the work.
170 */
171
172/*
173 * Automatically bind an unbound socket.
174 */
175
176static int inet_autobind(struct sock *sk)
177{
178 struct inet_sock *inet;
179 /* We may need to bind the socket. */
180 lock_sock(sk);
181 inet = inet_sk(sk);
182 if (!inet->inet_num) {
183 if (sk->sk_prot->get_port(sk, 0)) {
184 release_sock(sk);
185 return -EAGAIN;
186 }
187 inet->inet_sport = htons(inet->inet_num);
188 }
189 release_sock(sk);
190 return 0;
191}
192
193int __inet_listen_sk(struct sock *sk, int backlog)
194{
195 unsigned char old_state = sk->sk_state;
196 int err, tcp_fastopen;
197
198 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
199 return -EINVAL;
200
201 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
202 /* Really, if the socket is already in listen state
203 * we can only allow the backlog to be adjusted.
204 */
205 if (old_state != TCP_LISTEN) {
206 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
207 * Note that only TCP sockets (SOCK_STREAM) will reach here.
208 * Also fastopen backlog may already been set via the option
209 * because the socket was in TCP_LISTEN state previously but
210 * was shutdown() rather than close().
211 */
212 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen);
213 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
214 (tcp_fastopen & TFO_SERVER_ENABLE) &&
215 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
216 fastopen_queue_tune(sk, backlog);
217 tcp_fastopen_init_key_once(net: sock_net(sk));
218 }
219
220 err = inet_csk_listen_start(sk);
221 if (err)
222 return err;
223
224 tcp_call_bpf(sk, op: BPF_SOCK_OPS_TCP_LISTEN_CB, nargs: 0, NULL);
225 }
226 return 0;
227}
228
229/*
230 * Move a socket into listening state.
231 */
232int inet_listen(struct socket *sock, int backlog)
233{
234 struct sock *sk = sock->sk;
235 int err = -EINVAL;
236
237 lock_sock(sk);
238
239 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
240 goto out;
241
242 err = __inet_listen_sk(sk, backlog);
243
244out:
245 release_sock(sk);
246 return err;
247}
248EXPORT_SYMBOL(inet_listen);
249
250/*
251 * Create an inet socket.
252 */
253
254static int inet_create(struct net *net, struct socket *sock, int protocol,
255 int kern)
256{
257 struct sock *sk;
258 struct inet_protosw *answer;
259 struct inet_sock *inet;
260 struct proto *answer_prot;
261 unsigned char answer_flags;
262 int try_loading_module = 0;
263 int err;
264
265 if (protocol < 0 || protocol >= IPPROTO_MAX)
266 return -EINVAL;
267
268 sock->state = SS_UNCONNECTED;
269
270 /* Look for the requested type/protocol pair. */
271lookup_protocol:
272 err = -ESOCKTNOSUPPORT;
273 rcu_read_lock();
274 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
275
276 err = 0;
277 /* Check the non-wild match. */
278 if (protocol == answer->protocol) {
279 if (protocol != IPPROTO_IP)
280 break;
281 } else {
282 /* Check for the two wild cases. */
283 if (IPPROTO_IP == protocol) {
284 protocol = answer->protocol;
285 break;
286 }
287 if (IPPROTO_IP == answer->protocol)
288 break;
289 }
290 err = -EPROTONOSUPPORT;
291 }
292
293 if (unlikely(err)) {
294 if (try_loading_module < 2) {
295 rcu_read_unlock();
296 /*
297 * Be more specific, e.g. net-pf-2-proto-132-type-1
298 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
299 */
300 if (++try_loading_module == 1)
301 request_module("net-pf-%d-proto-%d-type-%d",
302 PF_INET, protocol, sock->type);
303 /*
304 * Fall back to generic, e.g. net-pf-2-proto-132
305 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
306 */
307 else
308 request_module("net-pf-%d-proto-%d",
309 PF_INET, protocol);
310 goto lookup_protocol;
311 } else
312 goto out_rcu_unlock;
313 }
314
315 err = -EPERM;
316 if (sock->type == SOCK_RAW && !kern &&
317 !ns_capable(ns: net->user_ns, CAP_NET_RAW))
318 goto out_rcu_unlock;
319
320 sock->ops = answer->ops;
321 answer_prot = answer->prot;
322 answer_flags = answer->flags;
323 rcu_read_unlock();
324
325 WARN_ON(!answer_prot->slab);
326
327 err = -ENOMEM;
328 sk = sk_alloc(net, PF_INET, GFP_KERNEL, prot: answer_prot, kern);
329 if (!sk)
330 goto out;
331
332 err = 0;
333 if (INET_PROTOSW_REUSE & answer_flags)
334 sk->sk_reuse = SK_CAN_REUSE;
335
336 if (INET_PROTOSW_ICSK & answer_flags)
337 inet_init_csk_locks(sk);
338
339 inet = inet_sk(sk);
340 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
341
342 inet_clear_bit(NODEFRAG, sk);
343
344 if (SOCK_RAW == sock->type) {
345 inet->inet_num = protocol;
346 if (IPPROTO_RAW == protocol)
347 inet_set_bit(HDRINCL, sk);
348 }
349
350 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
351 inet->pmtudisc = IP_PMTUDISC_DONT;
352 else
353 inet->pmtudisc = IP_PMTUDISC_WANT;
354
355 atomic_set(v: &inet->inet_id, i: 0);
356
357 sock_init_data(sock, sk);
358
359 sk->sk_destruct = inet_sock_destruct;
360 sk->sk_protocol = protocol;
361 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
362 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
363
364 inet->uc_ttl = -1;
365 inet_set_bit(MC_LOOP, sk);
366 inet->mc_ttl = 1;
367 inet_set_bit(MC_ALL, sk);
368 inet->mc_index = 0;
369 inet->mc_list = NULL;
370 inet->rcv_tos = 0;
371
372 if (inet->inet_num) {
373 /* It assumes that any protocol which allows
374 * the user to assign a number at socket
375 * creation time automatically
376 * shares.
377 */
378 inet->inet_sport = htons(inet->inet_num);
379 /* Add to protocol hash chains. */
380 err = sk->sk_prot->hash(sk);
381 if (err)
382 goto out_sk_release;
383 }
384
385 if (sk->sk_prot->init) {
386 err = sk->sk_prot->init(sk);
387 if (err)
388 goto out_sk_release;
389 }
390
391 if (!kern) {
392 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
393 if (err)
394 goto out_sk_release;
395 }
396out:
397 return err;
398out_rcu_unlock:
399 rcu_read_unlock();
400 goto out;
401out_sk_release:
402 sk_common_release(sk);
403 sock->sk = NULL;
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, flag: 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(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, ifindex: sk->sk_bound_dev_if) ? : tb_id;
495 chk_addr_ret = inet_addr_type_table(net, addr: 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: addr->sin_addr.s_addr,
506 addr_type: 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, port: snum) &&
513 !ns_capable(ns: 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(wq_head: sk_sleep(sk), wq_entry: &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(wq_entry: &wait, TASK_INTERRUPTIBLE, timeout: timeo);
613 lock_sock(sk);
614 if (signal_pending(current) || !timeo)
615 break;
616 }
617 remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &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, noblock: 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(sk: sock->sk);
750 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
751 release_sock(sk: 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(sk: 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(nr: SOCK_SUPPORT_ZC, addr: &newsock->flags);
767 sock_graft(sk: newsk, parent: 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,
777 struct proto_accept_arg *arg)
778{
779 struct sock *sk1 = sock->sk, *sk2;
780
781 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
782 arg->err = -EINVAL;
783 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, arg);
784 if (!sk2)
785 return arg->err;
786
787 lock_sock(sk: sk2);
788 __inet_accept(sock, newsock, newsk: sk2);
789 release_sock(sk: 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(s: sin->sin_zero, c: 0, n: 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(to: &rt, from: p, n: sizeof(struct rtentry)))
972 return -EFAULT;
973 err = ip_rt_ioctl(net, cmd, rt: &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, arg: (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: &ifr, NULL, arg: p))
989 return -EFAULT;
990 err = devinet_ioctl(net, cmd, &ifr);
991 if (!err && put_user_ifreq(ifr: &ifr, arg: 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: &ifr, NULL, arg: 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, arg: (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(to: &rt.rt_dst, from: &ur->rt_dst,
1024 n: 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(uptr: rtdev);
1034 return ip_rt_ioctl(sock_net(sk), cmd, rt: &rt);
1035}
1036
1037static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1038{
1039 void __user *argp = compat_ptr(uptr: 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, ur: 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 .set_peek_off = sk_set_peek_off,
1078 .read_sock = tcp_read_sock,
1079 .read_skb = tcp_read_skb,
1080 .sendmsg_locked = tcp_sendmsg_locked,
1081 .peek_len = tcp_peek_len,
1082#ifdef CONFIG_COMPAT
1083 .compat_ioctl = inet_compat_ioctl,
1084#endif
1085 .set_rcvlowat = tcp_set_rcvlowat,
1086};
1087EXPORT_SYMBOL(inet_stream_ops);
1088
1089const struct proto_ops inet_dgram_ops = {
1090 .family = PF_INET,
1091 .owner = THIS_MODULE,
1092 .release = inet_release,
1093 .bind = inet_bind,
1094 .connect = inet_dgram_connect,
1095 .socketpair = sock_no_socketpair,
1096 .accept = sock_no_accept,
1097 .getname = inet_getname,
1098 .poll = udp_poll,
1099 .ioctl = inet_ioctl,
1100 .gettstamp = sock_gettstamp,
1101 .listen = sock_no_listen,
1102 .shutdown = inet_shutdown,
1103 .setsockopt = sock_common_setsockopt,
1104 .getsockopt = sock_common_getsockopt,
1105 .sendmsg = inet_sendmsg,
1106 .read_skb = udp_read_skb,
1107 .recvmsg = inet_recvmsg,
1108 .mmap = sock_no_mmap,
1109 .splice_eof = inet_splice_eof,
1110 .set_peek_off = udp_set_peek_off,
1111#ifdef CONFIG_COMPAT
1112 .compat_ioctl = inet_compat_ioctl,
1113#endif
1114};
1115EXPORT_SYMBOL(inet_dgram_ops);
1116
1117/*
1118 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1119 * udp_poll
1120 */
1121static const struct proto_ops inet_sockraw_ops = {
1122 .family = PF_INET,
1123 .owner = THIS_MODULE,
1124 .release = inet_release,
1125 .bind = inet_bind,
1126 .connect = inet_dgram_connect,
1127 .socketpair = sock_no_socketpair,
1128 .accept = sock_no_accept,
1129 .getname = inet_getname,
1130 .poll = datagram_poll,
1131 .ioctl = inet_ioctl,
1132 .gettstamp = sock_gettstamp,
1133 .listen = sock_no_listen,
1134 .shutdown = inet_shutdown,
1135 .setsockopt = sock_common_setsockopt,
1136 .getsockopt = sock_common_getsockopt,
1137 .sendmsg = inet_sendmsg,
1138 .recvmsg = inet_recvmsg,
1139 .mmap = sock_no_mmap,
1140 .splice_eof = inet_splice_eof,
1141#ifdef CONFIG_COMPAT
1142 .compat_ioctl = inet_compat_ioctl,
1143#endif
1144};
1145
1146static const struct net_proto_family inet_family_ops = {
1147 .family = PF_INET,
1148 .create = inet_create,
1149 .owner = THIS_MODULE,
1150};
1151
1152/* Upon startup we insert all the elements in inetsw_array[] into
1153 * the linked list inetsw.
1154 */
1155static struct inet_protosw inetsw_array[] =
1156{
1157 {
1158 .type = SOCK_STREAM,
1159 .protocol = IPPROTO_TCP,
1160 .prot = &tcp_prot,
1161 .ops = &inet_stream_ops,
1162 .flags = INET_PROTOSW_PERMANENT |
1163 INET_PROTOSW_ICSK,
1164 },
1165
1166 {
1167 .type = SOCK_DGRAM,
1168 .protocol = IPPROTO_UDP,
1169 .prot = &udp_prot,
1170 .ops = &inet_dgram_ops,
1171 .flags = INET_PROTOSW_PERMANENT,
1172 },
1173
1174 {
1175 .type = SOCK_DGRAM,
1176 .protocol = IPPROTO_ICMP,
1177 .prot = &ping_prot,
1178 .ops = &inet_sockraw_ops,
1179 .flags = INET_PROTOSW_REUSE,
1180 },
1181
1182 {
1183 .type = SOCK_RAW,
1184 .protocol = IPPROTO_IP, /* wild card */
1185 .prot = &raw_prot,
1186 .ops = &inet_sockraw_ops,
1187 .flags = INET_PROTOSW_REUSE,
1188 }
1189};
1190
1191#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1192
1193void inet_register_protosw(struct inet_protosw *p)
1194{
1195 struct list_head *lh;
1196 struct inet_protosw *answer;
1197 int protocol = p->protocol;
1198 struct list_head *last_perm;
1199
1200 spin_lock_bh(lock: &inetsw_lock);
1201
1202 if (p->type >= SOCK_MAX)
1203 goto out_illegal;
1204
1205 /* If we are trying to override a permanent protocol, bail. */
1206 last_perm = &inetsw[p->type];
1207 list_for_each(lh, &inetsw[p->type]) {
1208 answer = list_entry(lh, struct inet_protosw, list);
1209 /* Check only the non-wild match. */
1210 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1211 break;
1212 if (protocol == answer->protocol)
1213 goto out_permanent;
1214 last_perm = lh;
1215 }
1216
1217 /* Add the new entry after the last permanent entry if any, so that
1218 * the new entry does not override a permanent entry when matched with
1219 * a wild-card protocol. But it is allowed to override any existing
1220 * non-permanent entry. This means that when we remove this entry, the
1221 * system automatically returns to the old behavior.
1222 */
1223 list_add_rcu(new: &p->list, head: last_perm);
1224out:
1225 spin_unlock_bh(lock: &inetsw_lock);
1226
1227 return;
1228
1229out_permanent:
1230 pr_err("Attempt to override permanent protocol %d\n", protocol);
1231 goto out;
1232
1233out_illegal:
1234 pr_err("Ignoring attempt to register invalid socket type %d\n",
1235 p->type);
1236 goto out;
1237}
1238EXPORT_SYMBOL(inet_register_protosw);
1239
1240void inet_unregister_protosw(struct inet_protosw *p)
1241{
1242 if (INET_PROTOSW_PERMANENT & p->flags) {
1243 pr_err("Attempt to unregister permanent protocol %d\n",
1244 p->protocol);
1245 } else {
1246 spin_lock_bh(lock: &inetsw_lock);
1247 list_del_rcu(entry: &p->list);
1248 spin_unlock_bh(lock: &inetsw_lock);
1249
1250 synchronize_net();
1251 }
1252}
1253EXPORT_SYMBOL(inet_unregister_protosw);
1254
1255static int inet_sk_reselect_saddr(struct sock *sk)
1256{
1257 struct inet_sock *inet = inet_sk(sk);
1258 __be32 old_saddr = inet->inet_saddr;
1259 __be32 daddr = inet->inet_daddr;
1260 struct flowi4 *fl4;
1261 struct rtable *rt;
1262 __be32 new_saddr;
1263 struct ip_options_rcu *inet_opt;
1264 int err;
1265
1266 inet_opt = rcu_dereference_protected(inet->inet_opt,
1267 lockdep_sock_is_held(sk));
1268 if (inet_opt && inet_opt->opt.srr)
1269 daddr = inet_opt->opt.faddr;
1270
1271 /* Query new route. */
1272 fl4 = &inet->cork.fl.u.ip4;
1273 rt = ip_route_connect(fl4, dst: daddr, src: 0, oif: sk->sk_bound_dev_if,
1274 protocol: sk->sk_protocol, sport: inet->inet_sport,
1275 dport: inet->inet_dport, sk);
1276 if (IS_ERR(ptr: rt))
1277 return PTR_ERR(ptr: rt);
1278
1279 new_saddr = fl4->saddr;
1280
1281 if (new_saddr == old_saddr) {
1282 sk_setup_caps(sk, dst: &rt->dst);
1283 return 0;
1284 }
1285
1286 err = inet_bhash2_update_saddr(sk, saddr: &new_saddr, AF_INET);
1287 if (err) {
1288 ip_rt_put(rt);
1289 return err;
1290 }
1291
1292 sk_setup_caps(sk, dst: &rt->dst);
1293
1294 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1295 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1296 __func__, &old_saddr, &new_saddr);
1297 }
1298
1299 /*
1300 * XXX The only one ugly spot where we need to
1301 * XXX really change the sockets identity after
1302 * XXX it has entered the hashes. -DaveM
1303 *
1304 * Besides that, it does not check for connection
1305 * uniqueness. Wait for troubles.
1306 */
1307 return __sk_prot_rehash(sk);
1308}
1309
1310int inet_sk_rebuild_header(struct sock *sk)
1311{
1312 struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0));
1313 struct inet_sock *inet = inet_sk(sk);
1314 struct flowi4 *fl4;
1315 int err;
1316
1317 /* Route is OK, nothing to do. */
1318 if (rt)
1319 return 0;
1320
1321 /* Reroute. */
1322 fl4 = &inet->cork.fl.u.ip4;
1323 inet_sk_init_flowi4(inet, fl4);
1324 rt = ip_route_output_flow(sock_net(sk), flp: fl4, sk);
1325 if (!IS_ERR(ptr: rt)) {
1326 err = 0;
1327 sk_setup_caps(sk, dst: &rt->dst);
1328 } else {
1329 err = PTR_ERR(ptr: rt);
1330
1331 /* Routing failed... */
1332 sk->sk_route_caps = 0;
1333
1334 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1335 sk->sk_state != TCP_SYN_SENT ||
1336 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1337 (err = inet_sk_reselect_saddr(sk)) != 0)
1338 WRITE_ONCE(sk->sk_err_soft, -err);
1339 }
1340
1341 return err;
1342}
1343EXPORT_SYMBOL(inet_sk_rebuild_header);
1344
1345void inet_sk_set_state(struct sock *sk, int state)
1346{
1347 trace_inet_sock_set_state(sk, oldstate: sk->sk_state, newstate: state);
1348 sk->sk_state = state;
1349}
1350EXPORT_SYMBOL(inet_sk_set_state);
1351
1352void inet_sk_state_store(struct sock *sk, int newstate)
1353{
1354 trace_inet_sock_set_state(sk, oldstate: sk->sk_state, newstate);
1355 smp_store_release(&sk->sk_state, newstate);
1356}
1357
1358struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1359 netdev_features_t features)
1360{
1361 bool udpfrag = false, fixedid = false, gso_partial, encap;
1362 struct sk_buff *segs = ERR_PTR(error: -EINVAL);
1363 const struct net_offload *ops;
1364 unsigned int offset = 0;
1365 struct iphdr *iph;
1366 int proto, tot_len;
1367 int nhoff;
1368 int ihl;
1369 int id;
1370
1371 skb_reset_network_header(skb);
1372 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1373 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1374 goto out;
1375
1376 iph = ip_hdr(skb);
1377 ihl = iph->ihl * 4;
1378 if (ihl < sizeof(*iph))
1379 goto out;
1380
1381 id = ntohs(iph->id);
1382 proto = iph->protocol;
1383
1384 /* Warning: after this point, iph might be no longer valid */
1385 if (unlikely(!pskb_may_pull(skb, ihl)))
1386 goto out;
1387 __skb_pull(skb, len: ihl);
1388
1389 encap = SKB_GSO_CB(skb)->encap_level > 0;
1390 if (encap)
1391 features &= skb->dev->hw_enc_features;
1392 SKB_GSO_CB(skb)->encap_level += ihl;
1393
1394 skb_reset_transport_header(skb);
1395
1396 segs = ERR_PTR(error: -EPROTONOSUPPORT);
1397
1398 fixedid = !!(skb_shinfo(skb)->gso_type & (SKB_GSO_TCP_FIXEDID << encap));
1399
1400 if (!skb->encapsulation || encap)
1401 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1402
1403 ops = rcu_dereference(inet_offloads[proto]);
1404 if (likely(ops && ops->callbacks.gso_segment)) {
1405 segs = ops->callbacks.gso_segment(skb, features);
1406 if (!segs)
1407 skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1408 }
1409
1410 if (IS_ERR_OR_NULL(ptr: segs))
1411 goto out;
1412
1413 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1414
1415 skb = segs;
1416 do {
1417 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1418 if (udpfrag) {
1419 iph->frag_off = htons(offset >> 3);
1420 if (skb->next)
1421 iph->frag_off |= htons(IP_MF);
1422 offset += skb->len - nhoff - ihl;
1423 tot_len = skb->len - nhoff;
1424 } else if (skb_is_gso(skb)) {
1425 if (!fixedid) {
1426 iph->id = htons(id);
1427 id += skb_shinfo(skb)->gso_segs;
1428 }
1429
1430 if (gso_partial)
1431 tot_len = skb_shinfo(skb)->gso_size +
1432 SKB_GSO_CB(skb)->data_offset +
1433 skb->head - (unsigned char *)iph;
1434 else
1435 tot_len = skb->len - nhoff;
1436 } else {
1437 if (!fixedid)
1438 iph->id = htons(id++);
1439 tot_len = skb->len - nhoff;
1440 }
1441 iph->tot_len = htons(tot_len);
1442 ip_send_check(ip: iph);
1443 if (encap)
1444 skb_reset_inner_headers(skb);
1445 skb->network_header = (u8 *)iph - skb->head;
1446 skb_reset_mac_len(skb);
1447 } while ((skb = skb->next));
1448
1449out:
1450 return segs;
1451}
1452
1453static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1454 netdev_features_t features)
1455{
1456 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1457 return ERR_PTR(error: -EINVAL);
1458
1459 return inet_gso_segment(skb, features);
1460}
1461
1462struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1463{
1464 const struct net_offload *ops;
1465 struct sk_buff *pp = NULL;
1466 const struct iphdr *iph;
1467 struct sk_buff *p;
1468 unsigned int hlen;
1469 unsigned int off;
1470 int flush = 1;
1471 int proto;
1472
1473 off = skb_gro_offset(skb);
1474 hlen = off + sizeof(*iph);
1475 iph = skb_gro_header(skb, hlen, offset: off);
1476 if (unlikely(!iph))
1477 goto out;
1478
1479 proto = iph->protocol;
1480
1481 ops = rcu_dereference(inet_offloads[proto]);
1482 if (!ops || !ops->callbacks.gro_receive)
1483 goto out;
1484
1485 if (*(u8 *)iph != 0x45)
1486 goto out;
1487
1488 if (ip_is_fragment(iph))
1489 goto out;
1490
1491 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1492 goto out;
1493
1494 NAPI_GRO_CB(skb)->proto = proto;
1495 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (ntohl(*(__be32 *)&iph->id) & ~IP_DF));
1496
1497 list_for_each_entry(p, head, list) {
1498 struct iphdr *iph2;
1499
1500 if (!NAPI_GRO_CB(p)->same_flow)
1501 continue;
1502
1503 iph2 = (struct iphdr *)(p->data + off);
1504 /* The above works because, with the exception of the top
1505 * (inner most) layer, we only aggregate pkts with the same
1506 * hdr length so all the hdrs we'll need to verify will start
1507 * at the same offset.
1508 */
1509 if ((iph->protocol ^ iph2->protocol) |
1510 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1511 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1512 NAPI_GRO_CB(p)->same_flow = 0;
1513 continue;
1514 }
1515 }
1516
1517 NAPI_GRO_CB(skb)->flush |= flush;
1518 NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = off;
1519
1520 /* Note : No need to call skb_gro_postpull_rcsum() here,
1521 * as we already checked checksum over ipv4 header was 0
1522 */
1523 skb_gro_pull(skb, len: sizeof(*iph));
1524 skb_set_transport_header(skb, offset: skb_gro_offset(skb));
1525
1526 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1527 ops->callbacks.gro_receive, head, skb);
1528
1529out:
1530 skb_gro_flush_final(skb, pp, flush);
1531
1532 return pp;
1533}
1534
1535static struct sk_buff *ipip_gro_receive(struct list_head *head,
1536 struct sk_buff *skb)
1537{
1538 if (NAPI_GRO_CB(skb)->encap_mark) {
1539 NAPI_GRO_CB(skb)->flush = 1;
1540 return NULL;
1541 }
1542
1543 NAPI_GRO_CB(skb)->encap_mark = 1;
1544
1545 return inet_gro_receive(head, skb);
1546}
1547
1548#define SECONDS_PER_DAY 86400
1549
1550/* inet_current_timestamp - Return IP network timestamp
1551 *
1552 * Return milliseconds since midnight in network byte order.
1553 */
1554__be32 inet_current_timestamp(void)
1555{
1556 u32 secs;
1557 u32 msecs;
1558 struct timespec64 ts;
1559
1560 ktime_get_real_ts64(tv: &ts);
1561
1562 /* Get secs since midnight. */
1563 (void)div_u64_rem(dividend: ts.tv_sec, SECONDS_PER_DAY, remainder: &secs);
1564 /* Convert to msecs. */
1565 msecs = secs * MSEC_PER_SEC;
1566 /* Convert nsec to msec. */
1567 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1568
1569 /* Convert to network byte order. */
1570 return htonl(msecs);
1571}
1572EXPORT_SYMBOL(inet_current_timestamp);
1573
1574int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1575{
1576 unsigned int family = READ_ONCE(sk->sk_family);
1577
1578 if (family == AF_INET)
1579 return ip_recv_error(sk, msg, len, addr_len);
1580#if IS_ENABLED(CONFIG_IPV6)
1581 if (family == AF_INET6)
1582 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1583#endif
1584 return -EINVAL;
1585}
1586EXPORT_SYMBOL(inet_recv_error);
1587
1588int inet_gro_complete(struct sk_buff *skb, int nhoff)
1589{
1590 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1591 const struct net_offload *ops;
1592 __be16 totlen = iph->tot_len;
1593 int proto = iph->protocol;
1594 int err = -ENOSYS;
1595
1596 if (skb->encapsulation) {
1597 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1598 skb_set_inner_network_header(skb, offset: nhoff);
1599 }
1600
1601 iph_set_totlen(iph, len: skb->len - nhoff);
1602 csum_replace2(sum: &iph->check, old: totlen, new: iph->tot_len);
1603
1604 ops = rcu_dereference(inet_offloads[proto]);
1605 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1606 goto out;
1607
1608 /* Only need to add sizeof(*iph) to get to the next hdr below
1609 * because any hdr with option will have been flushed in
1610 * inet_gro_receive().
1611 */
1612 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1613 tcp4_gro_complete, udp4_gro_complete,
1614 skb, nhoff + sizeof(*iph));
1615
1616out:
1617 return err;
1618}
1619
1620static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1621{
1622 skb->encapsulation = 1;
1623 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1624 return inet_gro_complete(skb, nhoff);
1625}
1626
1627int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1628 unsigned short type, unsigned char protocol,
1629 struct net *net)
1630{
1631 struct socket *sock;
1632 int rc = sock_create_kern(net, family, type, proto: protocol, res: &sock);
1633
1634 if (rc == 0) {
1635 *sk = sock->sk;
1636 (*sk)->sk_allocation = GFP_ATOMIC;
1637 (*sk)->sk_use_task_frag = false;
1638 /*
1639 * Unhash it so that IP input processing does not even see it,
1640 * we do not wish this socket to see incoming packets.
1641 */
1642 (*sk)->sk_prot->unhash(*sk);
1643 }
1644 return rc;
1645}
1646EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1647
1648unsigned long snmp_fold_field(void __percpu *mib, int offt)
1649{
1650 unsigned long res = 0;
1651 int i;
1652
1653 for_each_possible_cpu(i)
1654 res += snmp_get_cpu_field(mib, cpu: i, offt);
1655 return res;
1656}
1657EXPORT_SYMBOL_GPL(snmp_fold_field);
1658
1659#if BITS_PER_LONG==32
1660
1661u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1662 size_t syncp_offset)
1663{
1664 void *bhptr;
1665 struct u64_stats_sync *syncp;
1666 u64 v;
1667 unsigned int start;
1668
1669 bhptr = per_cpu_ptr(mib, cpu);
1670 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1671 do {
1672 start = u64_stats_fetch_begin(syncp);
1673 v = *(((u64 *)bhptr) + offt);
1674 } while (u64_stats_fetch_retry(syncp, start));
1675
1676 return v;
1677}
1678EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1679
1680u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1681{
1682 u64 res = 0;
1683 int cpu;
1684
1685 for_each_possible_cpu(cpu) {
1686 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1687 }
1688 return res;
1689}
1690EXPORT_SYMBOL_GPL(snmp_fold_field64);
1691#endif
1692
1693#ifdef CONFIG_IP_MULTICAST
1694static const struct net_protocol igmp_protocol = {
1695 .handler = igmp_rcv,
1696};
1697#endif
1698
1699static const struct net_protocol icmp_protocol = {
1700 .handler = icmp_rcv,
1701 .err_handler = icmp_err,
1702 .no_policy = 1,
1703};
1704
1705static __net_init int ipv4_mib_init_net(struct net *net)
1706{
1707 int i;
1708
1709 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1710 if (!net->mib.tcp_statistics)
1711 goto err_tcp_mib;
1712 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1713 if (!net->mib.ip_statistics)
1714 goto err_ip_mib;
1715
1716 for_each_possible_cpu(i) {
1717 struct ipstats_mib *af_inet_stats;
1718 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1719 u64_stats_init(syncp: &af_inet_stats->syncp);
1720 }
1721
1722 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1723 if (!net->mib.net_statistics)
1724 goto err_net_mib;
1725 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1726 if (!net->mib.udp_statistics)
1727 goto err_udp_mib;
1728 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1729 if (!net->mib.udplite_statistics)
1730 goto err_udplite_mib;
1731 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1732 if (!net->mib.icmp_statistics)
1733 goto err_icmp_mib;
1734 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1735 GFP_KERNEL);
1736 if (!net->mib.icmpmsg_statistics)
1737 goto err_icmpmsg_mib;
1738
1739 tcp_mib_init(net);
1740 return 0;
1741
1742err_icmpmsg_mib:
1743 free_percpu(pdata: net->mib.icmp_statistics);
1744err_icmp_mib:
1745 free_percpu(pdata: net->mib.udplite_statistics);
1746err_udplite_mib:
1747 free_percpu(pdata: net->mib.udp_statistics);
1748err_udp_mib:
1749 free_percpu(pdata: net->mib.net_statistics);
1750err_net_mib:
1751 free_percpu(pdata: net->mib.ip_statistics);
1752err_ip_mib:
1753 free_percpu(pdata: net->mib.tcp_statistics);
1754err_tcp_mib:
1755 return -ENOMEM;
1756}
1757
1758static __net_exit void ipv4_mib_exit_net(struct net *net)
1759{
1760 kfree(objp: net->mib.icmpmsg_statistics);
1761 free_percpu(pdata: net->mib.icmp_statistics);
1762 free_percpu(pdata: net->mib.udplite_statistics);
1763 free_percpu(pdata: net->mib.udp_statistics);
1764 free_percpu(pdata: net->mib.net_statistics);
1765 free_percpu(pdata: net->mib.ip_statistics);
1766 free_percpu(pdata: net->mib.tcp_statistics);
1767#ifdef CONFIG_MPTCP
1768 /* allocated on demand, see mptcp_init_sock() */
1769 free_percpu(net->mib.mptcp_statistics);
1770#endif
1771}
1772
1773static __net_initdata struct pernet_operations ipv4_mib_ops = {
1774 .init = ipv4_mib_init_net,
1775 .exit = ipv4_mib_exit_net,
1776};
1777
1778static int __init init_ipv4_mibs(void)
1779{
1780 return register_pernet_subsys(&ipv4_mib_ops);
1781}
1782
1783static __net_init int inet_init_net(struct net *net)
1784{
1785 /*
1786 * Set defaults for local port range
1787 */
1788 net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u;
1789
1790 seqlock_init(&net->ipv4.ping_group_range.lock);
1791 /*
1792 * Sane defaults - nobody may create ping sockets.
1793 * Boot scripts should set this to distro-specific group.
1794 */
1795 net->ipv4.ping_group_range.range[0] = make_kgid(from: &init_user_ns, gid: 1);
1796 net->ipv4.ping_group_range.range[1] = make_kgid(from: &init_user_ns, gid: 0);
1797
1798 /* Default values for sysctl-controlled parameters.
1799 * We set them here, in case sysctl is not compiled.
1800 */
1801 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1802 net->ipv4.sysctl_ip_fwd_update_priority = 1;
1803 net->ipv4.sysctl_ip_dynaddr = 0;
1804 net->ipv4.sysctl_ip_early_demux = 1;
1805 net->ipv4.sysctl_udp_early_demux = 1;
1806 net->ipv4.sysctl_tcp_early_demux = 1;
1807 net->ipv4.sysctl_nexthop_compat_mode = 1;
1808#ifdef CONFIG_SYSCTL
1809 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1810#endif
1811
1812 /* Some igmp sysctl, whose values are always used */
1813 net->ipv4.sysctl_igmp_max_memberships = 20;
1814 net->ipv4.sysctl_igmp_max_msf = 10;
1815 /* IGMP reports for link-local multicast groups are enabled by default */
1816 net->ipv4.sysctl_igmp_llm_reports = 1;
1817 net->ipv4.sysctl_igmp_qrv = 2;
1818
1819 net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1820
1821 return 0;
1822}
1823
1824static __net_initdata struct pernet_operations af_inet_ops = {
1825 .init = inet_init_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
1839
1840static const struct net_offload ipip_offload = {
1841 .callbacks = {
1842 .gso_segment = ipip_gso_segment,
1843 .gro_receive = ipip_gro_receive,
1844 .gro_complete = ipip_gro_complete,
1845 },
1846};
1847
1848static int __init ipip_offload_init(void)
1849{
1850 return inet_add_offload(prot: &ipip_offload, IPPROTO_IPIP);
1851}
1852
1853static int __init ipv4_offload_init(void)
1854{
1855 /*
1856 * Add offloads
1857 */
1858 if (udpv4_offload_init() < 0)
1859 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1860 if (tcpv4_offload_init() < 0)
1861 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1862 if (ipip_offload_init() < 0)
1863 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1864
1865 net_hotdata.ip_packet_offload = (struct packet_offload) {
1866 .type = cpu_to_be16(ETH_P_IP),
1867 .callbacks = {
1868 .gso_segment = inet_gso_segment,
1869 .gro_receive = inet_gro_receive,
1870 .gro_complete = inet_gro_complete,
1871 },
1872 };
1873 dev_add_offload(po: &net_hotdata.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 .list_func = ip_list_rcv,
1883};
1884
1885static int __init inet_init(void)
1886{
1887 struct inet_protosw *q;
1888 struct list_head *r;
1889 int rc;
1890
1891 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1892
1893 raw_hashinfo_init(hashinfo: &raw_v4_hashinfo);
1894
1895 rc = proto_register(prot: &tcp_prot, alloc_slab: 1);
1896 if (rc)
1897 goto out;
1898
1899 rc = proto_register(prot: &udp_prot, alloc_slab: 1);
1900 if (rc)
1901 goto out_unregister_tcp_proto;
1902
1903 rc = proto_register(prot: &raw_prot, alloc_slab: 1);
1904 if (rc)
1905 goto out_unregister_udp_proto;
1906
1907 rc = proto_register(prot: &ping_prot, alloc_slab: 1);
1908 if (rc)
1909 goto out_unregister_raw_proto;
1910
1911 /*
1912 * Tell SOCKET that we are alive...
1913 */
1914
1915 (void)sock_register(fam: &inet_family_ops);
1916
1917#ifdef CONFIG_SYSCTL
1918 ip_static_sysctl_init();
1919#endif
1920
1921 /*
1922 * Add all the base protocols.
1923 */
1924
1925 if (inet_add_protocol(prot: &icmp_protocol, IPPROTO_ICMP) < 0)
1926 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1927
1928 net_hotdata.udp_protocol = (struct net_protocol) {
1929 .handler = udp_rcv,
1930 .err_handler = udp_err,
1931 .no_policy = 1,
1932 };
1933 if (inet_add_protocol(prot: &net_hotdata.udp_protocol, IPPROTO_UDP) < 0)
1934 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1935
1936 net_hotdata.tcp_protocol = (struct net_protocol) {
1937 .handler = tcp_v4_rcv,
1938 .err_handler = tcp_v4_err,
1939 .no_policy = 1,
1940 .icmp_strict_tag_validation = 1,
1941 };
1942 if (inet_add_protocol(prot: &net_hotdata.tcp_protocol, IPPROTO_TCP) < 0)
1943 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1944#ifdef CONFIG_IP_MULTICAST
1945 if (inet_add_protocol(prot: &igmp_protocol, IPPROTO_IGMP) < 0)
1946 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1947#endif
1948
1949 /* Register the socket-side information for inet_create. */
1950 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1951 INIT_LIST_HEAD(list: r);
1952
1953 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1954 inet_register_protosw(q);
1955
1956 /*
1957 * Set the ARP module up
1958 */
1959
1960 arp_init();
1961
1962 /*
1963 * Set the IP module up
1964 */
1965
1966 ip_init();
1967
1968 /* Initialise per-cpu ipv4 mibs */
1969 if (init_ipv4_mibs())
1970 panic(fmt: "%s: Cannot init ipv4 mibs\n", __func__);
1971
1972 /* Setup TCP slab cache for open requests. */
1973 tcp_init();
1974
1975 /* Setup UDP memory threshold */
1976 udp_init();
1977
1978 /* Add UDP-Lite (RFC 3828) */
1979 udplite4_register();
1980
1981 raw_init();
1982
1983 ping_init();
1984
1985 /*
1986 * Set the ICMP layer up
1987 */
1988
1989 if (icmp_init() < 0)
1990 panic(fmt: "Failed to create the ICMP control socket.\n");
1991
1992 /*
1993 * Initialise the multicast router
1994 */
1995#if defined(CONFIG_IP_MROUTE)
1996 if (ip_mr_init())
1997 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1998#endif
1999
2000 if (init_inet_pernet_ops())
2001 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2002
2003 ipv4_proc_init();
2004
2005 ipfrag_init();
2006
2007 dev_add_pack(pt: &ip_packet_type);
2008
2009 ip_tunnel_core_init();
2010
2011 rc = 0;
2012out:
2013 return rc;
2014out_unregister_raw_proto:
2015 proto_unregister(prot: &raw_prot);
2016out_unregister_udp_proto:
2017 proto_unregister(prot: &udp_prot);
2018out_unregister_tcp_proto:
2019 proto_unregister(prot: &tcp_prot);
2020 goto out;
2021}
2022
2023fs_initcall(inet_init);
2024
2025/* ------------------------------------------------------------------------ */
2026
2027#ifdef CONFIG_PROC_FS
2028static int __init ipv4_proc_init(void)
2029{
2030 int rc = 0;
2031
2032 if (raw_proc_init())
2033 goto out_raw;
2034 if (tcp4_proc_init())
2035 goto out_tcp;
2036 if (udp4_proc_init())
2037 goto out_udp;
2038 if (ping_proc_init())
2039 goto out_ping;
2040 if (ip_misc_proc_init())
2041 goto out_misc;
2042out:
2043 return rc;
2044out_misc:
2045 ping_proc_exit();
2046out_ping:
2047 udp4_proc_exit();
2048out_udp:
2049 tcp4_proc_exit();
2050out_tcp:
2051 raw_proc_exit();
2052out_raw:
2053 rc = -ENOMEM;
2054 goto out;
2055}
2056
2057#else /* CONFIG_PROC_FS */
2058static int __init ipv4_proc_init(void)
2059{
2060 return 0;
2061}
2062#endif /* CONFIG_PROC_FS */
2063