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/tcp.h>
103 #include <net/udp.h>
104 #include <net/udplite.h>
105 #include <net/ping.h>
106 #include <linux/skbuff.h>
107 #include <net/sock.h>
108 #include <net/raw.h>
109 #include <net/icmp.h>
110 #include <net/inet_common.h>
111 #include <net/ip_tunnels.h>
112 #include <net/xfrm.h>
113 #include <net/net_namespace.h>
114 #include <net/secure_seq.h>
115 #ifdef CONFIG_IP_MROUTE
116 #include <linux/mroute.h>
117 #endif
118 #include <net/l3mdev.h>
119 #include <net/compat.h>
120
121 #include <trace/events/sock.h>
122
123 /* The inetsw table contains everything that inet_create needs to
124 * build a new socket.
125 */
126 static struct list_head inetsw[SOCK_MAX];
127 static DEFINE_SPINLOCK(inetsw_lock);
128
129 /* New destruction routine */
130
131 void inet_sock_destruct(struct sock *sk)
132 {
133 struct inet_sock *inet = inet_sk(sk);
134
135 __skb_queue_purge(&sk->sk_receive_queue);
136 if (sk->sk_rx_skb_cache) {
137 __kfree_skb(sk->sk_rx_skb_cache);
138 sk->sk_rx_skb_cache = NULL;
139 }
140 __skb_queue_purge(&sk->sk_error_queue);
141
142 sk_mem_reclaim(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, SOCK_DEAD)) {
150 pr_err("Attempt to release alive inet socket %p\n", sk);
151 return;
152 }
153
154 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
155 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
156 WARN_ON(sk->sk_wmem_queued);
157 WARN_ON(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(sk->sk_rx_dst);
162 sk_refcnt_debug_dec(sk);
163 }
164 EXPORT_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
176 static 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
193 /*
194 * Move a socket into listening state.
195 */
196 int inet_listen(struct socket *sock, int backlog)
197 {
198 struct sock *sk = sock->sk;
199 unsigned char old_state;
200 int err, tcp_fastopen;
201
202 lock_sock(sk);
203
204 err = -EINVAL;
205 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
206 goto out;
207
208 old_state = sk->sk_state;
209 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
210 goto out;
211
212 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
213 /* Really, if the socket is already in listen state
214 * we can only allow the backlog to be adjusted.
215 */
216 if (old_state != TCP_LISTEN) {
217 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
218 * Note that only TCP sockets (SOCK_STREAM) will reach here.
219 * Also fastopen backlog may already been set via the option
220 * because the socket was in TCP_LISTEN state previously but
221 * was shutdown() rather than close().
222 */
223 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen;
224 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
225 (tcp_fastopen & TFO_SERVER_ENABLE) &&
226 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
227 fastopen_queue_tune(sk, backlog);
228 tcp_fastopen_init_key_once(sock_net(sk));
229 }
230
231 err = inet_csk_listen_start(sk, backlog);
232 if (err)
233 goto out;
234 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
235 }
236 err = 0;
237
238 out:
239 release_sock(sk);
240 return err;
241 }
242 EXPORT_SYMBOL(inet_listen);
243
244 /*
245 * Create an inet socket.
246 */
247
248 static int inet_create(struct net *net, struct socket *sock, int protocol,
249 int kern)
250 {
251 struct sock *sk;
252 struct inet_protosw *answer;
253 struct inet_sock *inet;
254 struct proto *answer_prot;
255 unsigned char answer_flags;
256 int try_loading_module = 0;
257 int err;
258
259 if (protocol < 0 || protocol >= IPPROTO_MAX)
260 return -EINVAL;
261
262 sock->state = SS_UNCONNECTED;
263
264 /* Look for the requested type/protocol pair. */
265 lookup_protocol:
266 err = -ESOCKTNOSUPPORT;
267 rcu_read_lock();
268 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
269
270 err = 0;
271 /* Check the non-wild match. */
272 if (protocol == answer->protocol) {
273 if (protocol != IPPROTO_IP)
274 break;
275 } else {
276 /* Check for the two wild cases. */
277 if (IPPROTO_IP == protocol) {
278 protocol = answer->protocol;
279 break;
280 }
281 if (IPPROTO_IP == answer->protocol)
282 break;
283 }
284 err = -EPROTONOSUPPORT;
285 }
286
287 if (unlikely(err)) {
288 if (try_loading_module < 2) {
289 rcu_read_unlock();
290 /*
291 * Be more specific, e.g. net-pf-2-proto-132-type-1
292 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
293 */
294 if (++try_loading_module == 1)
295 request_module("net-pf-%d-proto-%d-type-%d",
296 PF_INET, protocol, sock->type);
297 /*
298 * Fall back to generic, e.g. net-pf-2-proto-132
299 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
300 */
301 else
302 request_module("net-pf-%d-proto-%d",
303 PF_INET, protocol);
304 goto lookup_protocol;
305 } else
306 goto out_rcu_unlock;
307 }
308
309 err = -EPERM;
310 if (sock->type == SOCK_RAW && !kern &&
311 !ns_capable(net->user_ns, CAP_NET_RAW))
312 goto out_rcu_unlock;
313
314 sock->ops = answer->ops;
315 answer_prot = answer->prot;
316 answer_flags = answer->flags;
317 rcu_read_unlock();
318
319 WARN_ON(!answer_prot->slab);
320
321 err = -ENOBUFS;
322 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
323 if (!sk)
324 goto out;
325
326 err = 0;
327 if (INET_PROTOSW_REUSE & answer_flags)
328 sk->sk_reuse = SK_CAN_REUSE;
329
330 inet = inet_sk(sk);
331 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
332
333 inet->nodefrag = 0;
334
335 if (SOCK_RAW == sock->type) {
336 inet->inet_num = protocol;
337 if (IPPROTO_RAW == protocol)
338 inet->hdrincl = 1;
339 }
340
341 if (net->ipv4.sysctl_ip_no_pmtu_disc)
342 inet->pmtudisc = IP_PMTUDISC_DONT;
343 else
344 inet->pmtudisc = IP_PMTUDISC_WANT;
345
346 inet->inet_id = 0;
347
348 sock_init_data(sock, sk);
349
350 sk->sk_destruct = inet_sock_destruct;
351 sk->sk_protocol = protocol;
352 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
353
354 inet->uc_ttl = -1;
355 inet->mc_loop = 1;
356 inet->mc_ttl = 1;
357 inet->mc_all = 1;
358 inet->mc_index = 0;
359 inet->mc_list = NULL;
360 inet->rcv_tos = 0;
361
362 sk_refcnt_debug_inc(sk);
363
364 if (inet->inet_num) {
365 /* It assumes that any protocol which allows
366 * the user to assign a number at socket
367 * creation time automatically
368 * shares.
369 */
370 inet->inet_sport = htons(inet->inet_num);
371 /* Add to protocol hash chains. */
372 err = sk->sk_prot->hash(sk);
373 if (err) {
374 sk_common_release(sk);
375 goto out;
376 }
377 }
378
379 if (sk->sk_prot->init) {
380 err = sk->sk_prot->init(sk);
381 if (err) {
382 sk_common_release(sk);
383 goto out;
384 }
385 }
386
387 if (!kern) {
388 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
389 if (err) {
390 sk_common_release(sk);
391 goto out;
392 }
393 }
394 out:
395 return err;
396 out_rcu_unlock:
397 rcu_read_unlock();
398 goto out;
399 }
400
401
402 /*
403 * The peer socket should always be NULL (or else). When we call this
404 * function we are destroying the object and from then on nobody
405 * should refer to it.
406 */
407 int inet_release(struct socket *sock)
408 {
409 struct sock *sk = sock->sk;
410
411 if (sk) {
412 long timeout;
413
414 if (!sk->sk_kern_sock)
415 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
416
417 /* Applications forget to leave groups before exiting */
418 ip_mc_drop_socket(sk);
419
420 /* If linger is set, we don't return until the close
421 * is complete. Otherwise we return immediately. The
422 * actually closing is done the same either way.
423 *
424 * If the close is due to the process exiting, we never
425 * linger..
426 */
427 timeout = 0;
428 if (sock_flag(sk, SOCK_LINGER) &&
429 !(current->flags & PF_EXITING))
430 timeout = sk->sk_lingertime;
431 sk->sk_prot->close(sk, timeout);
432 sock->sk = NULL;
433 }
434 return 0;
435 }
436 EXPORT_SYMBOL(inet_release);
437
438 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
439 {
440 struct sock *sk = sock->sk;
441 u32 flags = BIND_WITH_LOCK;
442 int err;
443
444 /* If the socket has its own bind function then use it. (RAW) */
445 if (sk->sk_prot->bind) {
446 return sk->sk_prot->bind(sk, uaddr, addr_len);
447 }
448 if (addr_len < sizeof(struct sockaddr_in))
449 return -EINVAL;
450
451 /* BPF prog is run before any checks are done so that if the prog
452 * changes context in a wrong way it will be caught.
453 */
454 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
455 BPF_CGROUP_INET4_BIND, &flags);
456 if (err)
457 return err;
458
459 return __inet_bind(sk, uaddr, addr_len, flags);
460 }
461 EXPORT_SYMBOL(inet_bind);
462
463 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
464 u32 flags)
465 {
466 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
467 struct inet_sock *inet = inet_sk(sk);
468 struct net *net = sock_net(sk);
469 unsigned short snum;
470 int chk_addr_ret;
471 u32 tb_id = RT_TABLE_LOCAL;
472 int err;
473
474 if (addr->sin_family != AF_INET) {
475 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
476 * only if s_addr is INADDR_ANY.
477 */
478 err = -EAFNOSUPPORT;
479 if (addr->sin_family != AF_UNSPEC ||
480 addr->sin_addr.s_addr != htonl(INADDR_ANY))
481 goto out;
482 }
483
484 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
485 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
486
487 /* Not specified by any standard per-se, however it breaks too
488 * many applications when removed. It is unfortunate since
489 * allowing applications to make a non-local bind solves
490 * several problems with systems using dynamic addressing.
491 * (ie. your servers still start up even if your ISDN link
492 * is temporarily down)
493 */
494 err = -EADDRNOTAVAIL;
495 if (!inet_can_nonlocal_bind(net, inet) &&
496 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
497 chk_addr_ret != RTN_LOCAL &&
498 chk_addr_ret != RTN_MULTICAST &&
499 chk_addr_ret != RTN_BROADCAST)
500 goto out;
501
502 snum = ntohs(addr->sin_port);
503 err = -EACCES;
504 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
505 snum && inet_port_requires_bind_service(net, snum) &&
506 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
507 goto out;
508
509 /* We keep a pair of addresses. rcv_saddr is the one
510 * used by hash lookups, and saddr is used for transmit.
511 *
512 * In the BSD API these are the same except where it
513 * would be illegal to use them (multicast/broadcast) in
514 * which case the sending device address is used.
515 */
516 if (flags & BIND_WITH_LOCK)
517 lock_sock(sk);
518
519 /* Check these errors (active socket, double bind). */
520 err = -EINVAL;
521 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
522 goto out_release_sock;
523
524 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
525 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
526 inet->inet_saddr = 0; /* Use device */
527
528 /* Make sure we are allowed to bind here. */
529 if (snum || !(inet->bind_address_no_port ||
530 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
531 if (sk->sk_prot->get_port(sk, snum)) {
532 inet->inet_saddr = inet->inet_rcv_saddr = 0;
533 err = -EADDRINUSE;
534 goto out_release_sock;
535 }
536 if (!(flags & BIND_FROM_BPF)) {
537 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
538 if (err) {
539 inet->inet_saddr = inet->inet_rcv_saddr = 0;
540 goto out_release_sock;
541 }
542 }
543 }
544
545 if (inet->inet_rcv_saddr)
546 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
547 if (snum)
548 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
549 inet->inet_sport = htons(inet->inet_num);
550 inet->inet_daddr = 0;
551 inet->inet_dport = 0;
552 sk_dst_reset(sk);
553 err = 0;
554 out_release_sock:
555 if (flags & BIND_WITH_LOCK)
556 release_sock(sk);
557 out:
558 return err;
559 }
560
561 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
562 int addr_len, int flags)
563 {
564 struct sock *sk = sock->sk;
565 int err;
566
567 if (addr_len < sizeof(uaddr->sa_family))
568 return -EINVAL;
569 if (uaddr->sa_family == AF_UNSPEC)
570 return sk->sk_prot->disconnect(sk, flags);
571
572 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
573 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
574 if (err)
575 return err;
576 }
577
578 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
579 return -EAGAIN;
580 return sk->sk_prot->connect(sk, uaddr, addr_len);
581 }
582 EXPORT_SYMBOL(inet_dgram_connect);
583
584 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
585 {
586 DEFINE_WAIT_FUNC(wait, woken_wake_function);
587
588 add_wait_queue(sk_sleep(sk), &wait);
589 sk->sk_write_pending += writebias;
590
591 /* Basic assumption: if someone sets sk->sk_err, he _must_
592 * change state of the socket from TCP_SYN_*.
593 * Connect() does not allow to get error notifications
594 * without closing the socket.
595 */
596 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
597 release_sock(sk);
598 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
599 lock_sock(sk);
600 if (signal_pending(current) || !timeo)
601 break;
602 }
603 remove_wait_queue(sk_sleep(sk), &wait);
604 sk->sk_write_pending -= writebias;
605 return timeo;
606 }
607
608 /*
609 * Connect to a remote host. There is regrettably still a little
610 * TCP 'magic' in here.
611 */
612 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
613 int addr_len, int flags, int is_sendmsg)
614 {
615 struct sock *sk = sock->sk;
616 int err;
617 long timeo;
618
619 /*
620 * uaddr can be NULL and addr_len can be 0 if:
621 * sk is a TCP fastopen active socket and
622 * TCP_FASTOPEN_CONNECT sockopt is set and
623 * we already have a valid cookie for this socket.
624 * In this case, user can call write() after connect().
625 * write() will invoke tcp_sendmsg_fastopen() which calls
626 * __inet_stream_connect().
627 */
628 if (uaddr) {
629 if (addr_len < sizeof(uaddr->sa_family))
630 return -EINVAL;
631
632 if (uaddr->sa_family == AF_UNSPEC) {
633 err = sk->sk_prot->disconnect(sk, flags);
634 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
635 goto out;
636 }
637 }
638
639 switch (sock->state) {
640 default:
641 err = -EINVAL;
642 goto out;
643 case SS_CONNECTED:
644 err = -EISCONN;
645 goto out;
646 case SS_CONNECTING:
647 if (inet_sk(sk)->defer_connect)
648 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
649 else
650 err = -EALREADY;
651 /* Fall out of switch with err, set for this state */
652 break;
653 case SS_UNCONNECTED:
654 err = -EISCONN;
655 if (sk->sk_state != TCP_CLOSE)
656 goto out;
657
658 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
659 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
660 if (err)
661 goto out;
662 }
663
664 err = sk->sk_prot->connect(sk, uaddr, addr_len);
665 if (err < 0)
666 goto out;
667
668 sock->state = SS_CONNECTING;
669
670 if (!err && inet_sk(sk)->defer_connect)
671 goto out;
672
673 /* Just entered SS_CONNECTING state; the only
674 * difference is that return value in non-blocking
675 * case is EINPROGRESS, rather than EALREADY.
676 */
677 err = -EINPROGRESS;
678 break;
679 }
680
681 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
682
683 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
684 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
685 tcp_sk(sk)->fastopen_req &&
686 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
687
688 /* Error code is set above */
689 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
690 goto out;
691
692 err = sock_intr_errno(timeo);
693 if (signal_pending(current))
694 goto out;
695 }
696
697 /* Connection was closed by RST, timeout, ICMP error
698 * or another process disconnected us.
699 */
700 if (sk->sk_state == TCP_CLOSE)
701 goto sock_error;
702
703 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
704 * and error was received after socket entered established state.
705 * Hence, it is handled normally after connect() return successfully.
706 */
707
708 sock->state = SS_CONNECTED;
709 err = 0;
710 out:
711 return err;
712
713 sock_error:
714 err = sock_error(sk) ? : -ECONNABORTED;
715 sock->state = SS_UNCONNECTED;
716 if (sk->sk_prot->disconnect(sk, flags))
717 sock->state = SS_DISCONNECTING;
718 goto out;
719 }
720 EXPORT_SYMBOL(__inet_stream_connect);
721
722 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
723 int addr_len, int flags)
724 {
725 int err;
726
727 lock_sock(sock->sk);
728 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
729 release_sock(sock->sk);
730 return err;
731 }
732 EXPORT_SYMBOL(inet_stream_connect);
733
734 /*
735 * Accept a pending connection. The TCP layer now gives BSD semantics.
736 */
737
738 int inet_accept(struct socket *sock, struct socket *newsock, int flags,
739 bool kern)
740 {
741 struct sock *sk1 = sock->sk;
742 int err = -EINVAL;
743 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
744
745 if (!sk2)
746 goto do_err;
747
748 lock_sock(sk2);
749
750 sock_rps_record_flow(sk2);
751 WARN_ON(!((1 << sk2->sk_state) &
752 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
753 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
754
755 sock_graft(sk2, newsock);
756
757 newsock->state = SS_CONNECTED;
758 err = 0;
759 release_sock(sk2);
760 do_err:
761 return err;
762 }
763 EXPORT_SYMBOL(inet_accept);
764
765 /*
766 * This does both peername and sockname.
767 */
768 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
769 int peer)
770 {
771 struct sock *sk = sock->sk;
772 struct inet_sock *inet = inet_sk(sk);
773 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
774
775 sin->sin_family = AF_INET;
776 if (peer) {
777 if (!inet->inet_dport ||
778 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
779 peer == 1))
780 return -ENOTCONN;
781 sin->sin_port = inet->inet_dport;
782 sin->sin_addr.s_addr = inet->inet_daddr;
783 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
784 BPF_CGROUP_INET4_GETPEERNAME,
785 NULL);
786 } else {
787 __be32 addr = inet->inet_rcv_saddr;
788 if (!addr)
789 addr = inet->inet_saddr;
790 sin->sin_port = inet->inet_sport;
791 sin->sin_addr.s_addr = addr;
792 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
793 BPF_CGROUP_INET4_GETSOCKNAME,
794 NULL);
795 }
796 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
797 return sizeof(*sin);
798 }
799 EXPORT_SYMBOL(inet_getname);
800
801 int inet_send_prepare(struct sock *sk)
802 {
803 sock_rps_record_flow(sk);
804
805 /* We may need to bind the socket. */
806 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
807 inet_autobind(sk))
808 return -EAGAIN;
809
810 return 0;
811 }
812 EXPORT_SYMBOL_GPL(inet_send_prepare);
813
814 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
815 {
816 struct sock *sk = sock->sk;
817
818 if (unlikely(inet_send_prepare(sk)))
819 return -EAGAIN;
820
821 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
822 sk, msg, size);
823 }
824 EXPORT_SYMBOL(inet_sendmsg);
825
826 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
827 size_t size, int flags)
828 {
829 struct sock *sk = sock->sk;
830
831 if (unlikely(inet_send_prepare(sk)))
832 return -EAGAIN;
833
834 if (sk->sk_prot->sendpage)
835 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
836 return sock_no_sendpage(sock, page, offset, size, flags);
837 }
838 EXPORT_SYMBOL(inet_sendpage);
839
840 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
841 size_t, int, int, int *));
842 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
843 int flags)
844 {
845 struct sock *sk = sock->sk;
846 int addr_len = 0;
847 int err;
848
849 if (likely(!(flags & MSG_ERRQUEUE)))
850 sock_rps_record_flow(sk);
851
852 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
853 sk, msg, size, flags & MSG_DONTWAIT,
854 flags & ~MSG_DONTWAIT, &addr_len);
855 if (err >= 0)
856 msg->msg_namelen = addr_len;
857 return err;
858 }
859 EXPORT_SYMBOL(inet_recvmsg);
860
861 int inet_shutdown(struct socket *sock, int how)
862 {
863 struct sock *sk = sock->sk;
864 int err = 0;
865
866 /* This should really check to make sure
867 * the socket is a TCP socket. (WHY AC...)
868 */
869 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
870 1->2 bit 2 snds.
871 2->3 */
872 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
873 return -EINVAL;
874
875 lock_sock(sk);
876 if (sock->state == SS_CONNECTING) {
877 if ((1 << sk->sk_state) &
878 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
879 sock->state = SS_DISCONNECTING;
880 else
881 sock->state = SS_CONNECTED;
882 }
883
884 switch (sk->sk_state) {
885 case TCP_CLOSE:
886 err = -ENOTCONN;
887 /* Hack to wake up other listeners, who can poll for
888 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
889 fallthrough;
890 default:
891 sk->sk_shutdown |= how;
892 if (sk->sk_prot->shutdown)
893 sk->sk_prot->shutdown(sk, how);
894 break;
895
896 /* Remaining two branches are temporary solution for missing
897 * close() in multithreaded environment. It is _not_ a good idea,
898 * but we have no choice until close() is repaired at VFS level.
899 */
900 case TCP_LISTEN:
901 if (!(how & RCV_SHUTDOWN))
902 break;
903 fallthrough;
904 case TCP_SYN_SENT:
905 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
906 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
907 break;
908 }
909
910 /* Wake up anyone sleeping in poll. */
911 sk->sk_state_change(sk);
912 release_sock(sk);
913 return err;
914 }
915 EXPORT_SYMBOL(inet_shutdown);
916
917 /*
918 * ioctl() calls you can issue on an INET socket. Most of these are
919 * device configuration and stuff and very rarely used. Some ioctls
920 * pass on to the socket itself.
921 *
922 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
923 * loads the devconfigure module does its configuring and unloads it.
924 * There's a good 20K of config code hanging around the kernel.
925 */
926
927 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
928 {
929 struct sock *sk = sock->sk;
930 int err = 0;
931 struct net *net = sock_net(sk);
932 void __user *p = (void __user *)arg;
933 struct ifreq ifr;
934 struct rtentry rt;
935
936 switch (cmd) {
937 case SIOCADDRT:
938 case SIOCDELRT:
939 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
940 return -EFAULT;
941 err = ip_rt_ioctl(net, cmd, &rt);
942 break;
943 case SIOCRTMSG:
944 err = -EINVAL;
945 break;
946 case SIOCDARP:
947 case SIOCGARP:
948 case SIOCSARP:
949 err = arp_ioctl(net, cmd, (void __user *)arg);
950 break;
951 case SIOCGIFADDR:
952 case SIOCGIFBRDADDR:
953 case SIOCGIFNETMASK:
954 case SIOCGIFDSTADDR:
955 case SIOCGIFPFLAGS:
956 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
957 return -EFAULT;
958 err = devinet_ioctl(net, cmd, &ifr);
959 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
960 err = -EFAULT;
961 break;
962
963 case SIOCSIFADDR:
964 case SIOCSIFBRDADDR:
965 case SIOCSIFNETMASK:
966 case SIOCSIFDSTADDR:
967 case SIOCSIFPFLAGS:
968 case SIOCSIFFLAGS:
969 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
970 return -EFAULT;
971 err = devinet_ioctl(net, cmd, &ifr);
972 break;
973 default:
974 if (sk->sk_prot->ioctl)
975 err = sk->sk_prot->ioctl(sk, cmd, arg);
976 else
977 err = -ENOIOCTLCMD;
978 break;
979 }
980 return err;
981 }
982 EXPORT_SYMBOL(inet_ioctl);
983
984 #ifdef CONFIG_COMPAT
985 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
986 struct compat_rtentry __user *ur)
987 {
988 compat_uptr_t rtdev;
989 struct rtentry rt;
990
991 if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
992 3 * sizeof(struct sockaddr)) ||
993 get_user(rt.rt_flags, &ur->rt_flags) ||
994 get_user(rt.rt_metric, &ur->rt_metric) ||
995 get_user(rt.rt_mtu, &ur->rt_mtu) ||
996 get_user(rt.rt_window, &ur->rt_window) ||
997 get_user(rt.rt_irtt, &ur->rt_irtt) ||
998 get_user(rtdev, &ur->rt_dev))
999 return -EFAULT;
1000
1001 rt.rt_dev = compat_ptr(rtdev);
1002 return ip_rt_ioctl(sock_net(sk), cmd, &rt);
1003 }
1004
1005 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1006 {
1007 void __user *argp = compat_ptr(arg);
1008 struct sock *sk = sock->sk;
1009
1010 switch (cmd) {
1011 case SIOCADDRT:
1012 case SIOCDELRT:
1013 return inet_compat_routing_ioctl(sk, cmd, argp);
1014 default:
1015 if (!sk->sk_prot->compat_ioctl)
1016 return -ENOIOCTLCMD;
1017 return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1018 }
1019 }
1020 #endif /* CONFIG_COMPAT */
1021
1022 const struct proto_ops inet_stream_ops = {
1023 .family = PF_INET,
1024 .owner = THIS_MODULE,
1025 .release = inet_release,
1026 .bind = inet_bind,
1027 .connect = inet_stream_connect,
1028 .socketpair = sock_no_socketpair,
1029 .accept = inet_accept,
1030 .getname = inet_getname,
1031 .poll = tcp_poll,
1032 .ioctl = inet_ioctl,
1033 .gettstamp = sock_gettstamp,
1034 .listen = inet_listen,
1035 .shutdown = inet_shutdown,
1036 .setsockopt = sock_common_setsockopt,
1037 .getsockopt = sock_common_getsockopt,
1038 .sendmsg = inet_sendmsg,
1039 .recvmsg = inet_recvmsg,
1040 #ifdef CONFIG_MMU
1041 .mmap = tcp_mmap,
1042 #endif
1043 .sendpage = inet_sendpage,
1044 .splice_read = tcp_splice_read,
1045 .read_sock = tcp_read_sock,
1046 .sendmsg_locked = tcp_sendmsg_locked,
1047 .sendpage_locked = tcp_sendpage_locked,
1048 .peek_len = tcp_peek_len,
1049 #ifdef CONFIG_COMPAT
1050 .compat_ioctl = inet_compat_ioctl,
1051 #endif
1052 .set_rcvlowat = tcp_set_rcvlowat,
1053 };
1054 EXPORT_SYMBOL(inet_stream_ops);
1055
1056 const struct proto_ops inet_dgram_ops = {
1057 .family = PF_INET,
1058 .owner = THIS_MODULE,
1059 .release = inet_release,
1060 .bind = inet_bind,
1061 .connect = inet_dgram_connect,
1062 .socketpair = sock_no_socketpair,
1063 .accept = sock_no_accept,
1064 .getname = inet_getname,
1065 .poll = udp_poll,
1066 .ioctl = inet_ioctl,
1067 .gettstamp = sock_gettstamp,
1068 .listen = sock_no_listen,
1069 .shutdown = inet_shutdown,
1070 .setsockopt = sock_common_setsockopt,
1071 .getsockopt = sock_common_getsockopt,
1072 .sendmsg = inet_sendmsg,
1073 .recvmsg = inet_recvmsg,
1074 .mmap = sock_no_mmap,
1075 .sendpage = inet_sendpage,
1076 .set_peek_off = sk_set_peek_off,
1077 #ifdef CONFIG_COMPAT
1078 .compat_ioctl = inet_compat_ioctl,
1079 #endif
1080 };
1081 EXPORT_SYMBOL(inet_dgram_ops);
1082
1083 /*
1084 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1085 * udp_poll
1086 */
1087 static const struct proto_ops inet_sockraw_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 = datagram_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 .recvmsg = inet_recvmsg,
1105 .mmap = sock_no_mmap,
1106 .sendpage = inet_sendpage,
1107 #ifdef CONFIG_COMPAT
1108 .compat_ioctl = inet_compat_ioctl,
1109 #endif
1110 };
1111
1112 static const struct net_proto_family inet_family_ops = {
1113 .family = PF_INET,
1114 .create = inet_create,
1115 .owner = THIS_MODULE,
1116 };
1117
1118 /* Upon startup we insert all the elements in inetsw_array[] into
1119 * the linked list inetsw.
1120 */
1121 static struct inet_protosw inetsw_array[] =
1122 {
1123 {
1124 .type = SOCK_STREAM,
1125 .protocol = IPPROTO_TCP,
1126 .prot = &tcp_prot,
1127 .ops = &inet_stream_ops,
1128 .flags = INET_PROTOSW_PERMANENT |
1129 INET_PROTOSW_ICSK,
1130 },
1131
1132 {
1133 .type = SOCK_DGRAM,
1134 .protocol = IPPROTO_UDP,
1135 .prot = &udp_prot,
1136 .ops = &inet_dgram_ops,
1137 .flags = INET_PROTOSW_PERMANENT,
1138 },
1139
1140 {
1141 .type = SOCK_DGRAM,
1142 .protocol = IPPROTO_ICMP,
1143 .prot = &ping_prot,
1144 .ops = &inet_sockraw_ops,
1145 .flags = INET_PROTOSW_REUSE,
1146 },
1147
1148 {
1149 .type = SOCK_RAW,
1150 .protocol = IPPROTO_IP, /* wild card */
1151 .prot = &raw_prot,
1152 .ops = &inet_sockraw_ops,
1153 .flags = INET_PROTOSW_REUSE,
1154 }
1155 };
1156
1157 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1158
1159 void inet_register_protosw(struct inet_protosw *p)
1160 {
1161 struct list_head *lh;
1162 struct inet_protosw *answer;
1163 int protocol = p->protocol;
1164 struct list_head *last_perm;
1165
1166 spin_lock_bh(&inetsw_lock);
1167
1168 if (p->type >= SOCK_MAX)
1169 goto out_illegal;
1170
1171 /* If we are trying to override a permanent protocol, bail. */
1172 last_perm = &inetsw[p->type];
1173 list_for_each(lh, &inetsw[p->type]) {
1174 answer = list_entry(lh, struct inet_protosw, list);
1175 /* Check only the non-wild match. */
1176 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1177 break;
1178 if (protocol == answer->protocol)
1179 goto out_permanent;
1180 last_perm = lh;
1181 }
1182
1183 /* Add the new entry after the last permanent entry if any, so that
1184 * the new entry does not override a permanent entry when matched with
1185 * a wild-card protocol. But it is allowed to override any existing
1186 * non-permanent entry. This means that when we remove this entry, the
1187 * system automatically returns to the old behavior.
1188 */
1189 list_add_rcu(&p->list, last_perm);
1190 out:
1191 spin_unlock_bh(&inetsw_lock);
1192
1193 return;
1194
1195 out_permanent:
1196 pr_err("Attempt to override permanent protocol %d\n", protocol);
1197 goto out;
1198
1199 out_illegal:
1200 pr_err("Ignoring attempt to register invalid socket type %d\n",
1201 p->type);
1202 goto out;
1203 }
1204 EXPORT_SYMBOL(inet_register_protosw);
1205
1206 void inet_unregister_protosw(struct inet_protosw *p)
1207 {
1208 if (INET_PROTOSW_PERMANENT & p->flags) {
1209 pr_err("Attempt to unregister permanent protocol %d\n",
1210 p->protocol);
1211 } else {
1212 spin_lock_bh(&inetsw_lock);
1213 list_del_rcu(&p->list);
1214 spin_unlock_bh(&inetsw_lock);
1215
1216 synchronize_net();
1217 }
1218 }
1219 EXPORT_SYMBOL(inet_unregister_protosw);
1220
1221 static int inet_sk_reselect_saddr(struct sock *sk)
1222 {
1223 struct inet_sock *inet = inet_sk(sk);
1224 __be32 old_saddr = inet->inet_saddr;
1225 __be32 daddr = inet->inet_daddr;
1226 struct flowi4 *fl4;
1227 struct rtable *rt;
1228 __be32 new_saddr;
1229 struct ip_options_rcu *inet_opt;
1230
1231 inet_opt = rcu_dereference_protected(inet->inet_opt,
1232 lockdep_sock_is_held(sk));
1233 if (inet_opt && inet_opt->opt.srr)
1234 daddr = inet_opt->opt.faddr;
1235
1236 /* Query new route. */
1237 fl4 = &inet->cork.fl.u.ip4;
1238 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1239 sk->sk_bound_dev_if, sk->sk_protocol,
1240 inet->inet_sport, inet->inet_dport, sk);
1241 if (IS_ERR(rt))
1242 return PTR_ERR(rt);
1243
1244 sk_setup_caps(sk, &rt->dst);
1245
1246 new_saddr = fl4->saddr;
1247
1248 if (new_saddr == old_saddr)
1249 return 0;
1250
1251 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1252 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1253 __func__, &old_saddr, &new_saddr);
1254 }
1255
1256 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1257
1258 /*
1259 * XXX The only one ugly spot where we need to
1260 * XXX really change the sockets identity after
1261 * XXX it has entered the hashes. -DaveM
1262 *
1263 * Besides that, it does not check for connection
1264 * uniqueness. Wait for troubles.
1265 */
1266 return __sk_prot_rehash(sk);
1267 }
1268
1269 int inet_sk_rebuild_header(struct sock *sk)
1270 {
1271 struct inet_sock *inet = inet_sk(sk);
1272 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1273 __be32 daddr;
1274 struct ip_options_rcu *inet_opt;
1275 struct flowi4 *fl4;
1276 int err;
1277
1278 /* Route is OK, nothing to do. */
1279 if (rt)
1280 return 0;
1281
1282 /* Reroute. */
1283 rcu_read_lock();
1284 inet_opt = rcu_dereference(inet->inet_opt);
1285 daddr = inet->inet_daddr;
1286 if (inet_opt && inet_opt->opt.srr)
1287 daddr = inet_opt->opt.faddr;
1288 rcu_read_unlock();
1289 fl4 = &inet->cork.fl.u.ip4;
1290 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1291 inet->inet_dport, inet->inet_sport,
1292 sk->sk_protocol, RT_CONN_FLAGS(sk),
1293 sk->sk_bound_dev_if);
1294 if (!IS_ERR(rt)) {
1295 err = 0;
1296 sk_setup_caps(sk, &rt->dst);
1297 } else {
1298 err = PTR_ERR(rt);
1299
1300 /* Routing failed... */
1301 sk->sk_route_caps = 0;
1302 /*
1303 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1304 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1305 */
1306 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1307 sk->sk_state != TCP_SYN_SENT ||
1308 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1309 (err = inet_sk_reselect_saddr(sk)) != 0)
1310 sk->sk_err_soft = -err;
1311 }
1312
1313 return err;
1314 }
1315 EXPORT_SYMBOL(inet_sk_rebuild_header);
1316
1317 void inet_sk_set_state(struct sock *sk, int state)
1318 {
1319 trace_inet_sock_set_state(sk, sk->sk_state, state);
1320 sk->sk_state = state;
1321 }
1322 EXPORT_SYMBOL(inet_sk_set_state);
1323
1324 void inet_sk_state_store(struct sock *sk, int newstate)
1325 {
1326 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1327 smp_store_release(&sk->sk_state, newstate);
1328 }
1329
1330 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1331 netdev_features_t features)
1332 {
1333 bool udpfrag = false, fixedid = false, gso_partial, encap;
1334 struct sk_buff *segs = ERR_PTR(-EINVAL);
1335 const struct net_offload *ops;
1336 unsigned int offset = 0;
1337 struct iphdr *iph;
1338 int proto, tot_len;
1339 int nhoff;
1340 int ihl;
1341 int id;
1342
1343 skb_reset_network_header(skb);
1344 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1345 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1346 goto out;
1347
1348 iph = ip_hdr(skb);
1349 ihl = iph->ihl * 4;
1350 if (ihl < sizeof(*iph))
1351 goto out;
1352
1353 id = ntohs(iph->id);
1354 proto = iph->protocol;
1355
1356 /* Warning: after this point, iph might be no longer valid */
1357 if (unlikely(!pskb_may_pull(skb, ihl)))
1358 goto out;
1359 __skb_pull(skb, ihl);
1360
1361 encap = SKB_GSO_CB(skb)->encap_level > 0;
1362 if (encap)
1363 features &= skb->dev->hw_enc_features;
1364 SKB_GSO_CB(skb)->encap_level += ihl;
1365
1366 skb_reset_transport_header(skb);
1367
1368 segs = ERR_PTR(-EPROTONOSUPPORT);
1369
1370 if (!skb->encapsulation || encap) {
1371 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1372 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1373
1374 /* fixed ID is invalid if DF bit is not set */
1375 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1376 goto out;
1377 }
1378
1379 ops = rcu_dereference(inet_offloads[proto]);
1380 if (likely(ops && ops->callbacks.gso_segment))
1381 segs = ops->callbacks.gso_segment(skb, features);
1382
1383 if (IS_ERR_OR_NULL(segs))
1384 goto out;
1385
1386 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1387
1388 skb = segs;
1389 do {
1390 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1391 if (udpfrag) {
1392 iph->frag_off = htons(offset >> 3);
1393 if (skb->next)
1394 iph->frag_off |= htons(IP_MF);
1395 offset += skb->len - nhoff - ihl;
1396 tot_len = skb->len - nhoff;
1397 } else if (skb_is_gso(skb)) {
1398 if (!fixedid) {
1399 iph->id = htons(id);
1400 id += skb_shinfo(skb)->gso_segs;
1401 }
1402
1403 if (gso_partial)
1404 tot_len = skb_shinfo(skb)->gso_size +
1405 SKB_GSO_CB(skb)->data_offset +
1406 skb->head - (unsigned char *)iph;
1407 else
1408 tot_len = skb->len - nhoff;
1409 } else {
1410 if (!fixedid)
1411 iph->id = htons(id++);
1412 tot_len = skb->len - nhoff;
1413 }
1414 iph->tot_len = htons(tot_len);
1415 ip_send_check(iph);
1416 if (encap)
1417 skb_reset_inner_headers(skb);
1418 skb->network_header = (u8 *)iph - skb->head;
1419 skb_reset_mac_len(skb);
1420 } while ((skb = skb->next));
1421
1422 out:
1423 return segs;
1424 }
1425
1426 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1427 netdev_features_t features)
1428 {
1429 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1430 return ERR_PTR(-EINVAL);
1431
1432 return inet_gso_segment(skb, features);
1433 }
1434
1435 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1436 {
1437 const struct net_offload *ops;
1438 struct sk_buff *pp = NULL;
1439 const struct iphdr *iph;
1440 struct sk_buff *p;
1441 unsigned int hlen;
1442 unsigned int off;
1443 unsigned int id;
1444 int flush = 1;
1445 int proto;
1446
1447 off = skb_gro_offset(skb);
1448 hlen = off + sizeof(*iph);
1449 iph = skb_gro_header_fast(skb, off);
1450 if (skb_gro_header_hard(skb, hlen)) {
1451 iph = skb_gro_header_slow(skb, hlen, off);
1452 if (unlikely(!iph))
1453 goto out;
1454 }
1455
1456 proto = iph->protocol;
1457
1458 rcu_read_lock();
1459 ops = rcu_dereference(inet_offloads[proto]);
1460 if (!ops || !ops->callbacks.gro_receive)
1461 goto out_unlock;
1462
1463 if (*(u8 *)iph != 0x45)
1464 goto out_unlock;
1465
1466 if (ip_is_fragment(iph))
1467 goto out_unlock;
1468
1469 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1470 goto out_unlock;
1471
1472 id = ntohl(*(__be32 *)&iph->id);
1473 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1474 id >>= 16;
1475
1476 list_for_each_entry(p, head, list) {
1477 struct iphdr *iph2;
1478 u16 flush_id;
1479
1480 if (!NAPI_GRO_CB(p)->same_flow)
1481 continue;
1482
1483 iph2 = (struct iphdr *)(p->data + off);
1484 /* The above works because, with the exception of the top
1485 * (inner most) layer, we only aggregate pkts with the same
1486 * hdr length so all the hdrs we'll need to verify will start
1487 * at the same offset.
1488 */
1489 if ((iph->protocol ^ iph2->protocol) |
1490 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1491 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1492 NAPI_GRO_CB(p)->same_flow = 0;
1493 continue;
1494 }
1495
1496 /* All fields must match except length and checksum. */
1497 NAPI_GRO_CB(p)->flush |=
1498 (iph->ttl ^ iph2->ttl) |
1499 (iph->tos ^ iph2->tos) |
1500 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1501
1502 NAPI_GRO_CB(p)->flush |= flush;
1503
1504 /* We need to store of the IP ID check to be included later
1505 * when we can verify that this packet does in fact belong
1506 * to a given flow.
1507 */
1508 flush_id = (u16)(id - ntohs(iph2->id));
1509
1510 /* This bit of code makes it much easier for us to identify
1511 * the cases where we are doing atomic vs non-atomic IP ID
1512 * checks. Specifically an atomic check can return IP ID
1513 * values 0 - 0xFFFF, while a non-atomic check can only
1514 * return 0 or 0xFFFF.
1515 */
1516 if (!NAPI_GRO_CB(p)->is_atomic ||
1517 !(iph->frag_off & htons(IP_DF))) {
1518 flush_id ^= NAPI_GRO_CB(p)->count;
1519 flush_id = flush_id ? 0xFFFF : 0;
1520 }
1521
1522 /* If the previous IP ID value was based on an atomic
1523 * datagram we can overwrite the value and ignore it.
1524 */
1525 if (NAPI_GRO_CB(skb)->is_atomic)
1526 NAPI_GRO_CB(p)->flush_id = flush_id;
1527 else
1528 NAPI_GRO_CB(p)->flush_id |= flush_id;
1529 }
1530
1531 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1532 NAPI_GRO_CB(skb)->flush |= flush;
1533 skb_set_network_header(skb, off);
1534 /* The above will be needed by the transport layer if there is one
1535 * immediately following this IP hdr.
1536 */
1537
1538 /* Note : No need to call skb_gro_postpull_rcsum() here,
1539 * as we already checked checksum over ipv4 header was 0
1540 */
1541 skb_gro_pull(skb, sizeof(*iph));
1542 skb_set_transport_header(skb, skb_gro_offset(skb));
1543
1544 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1545 ops->callbacks.gro_receive, head, skb);
1546
1547 out_unlock:
1548 rcu_read_unlock();
1549
1550 out:
1551 skb_gro_flush_final(skb, pp, flush);
1552
1553 return pp;
1554 }
1555
1556 static struct sk_buff *ipip_gro_receive(struct list_head *head,
1557 struct sk_buff *skb)
1558 {
1559 if (NAPI_GRO_CB(skb)->encap_mark) {
1560 NAPI_GRO_CB(skb)->flush = 1;
1561 return NULL;
1562 }
1563
1564 NAPI_GRO_CB(skb)->encap_mark = 1;
1565
1566 return inet_gro_receive(head, skb);
1567 }
1568
1569 #define SECONDS_PER_DAY 86400
1570
1571 /* inet_current_timestamp - Return IP network timestamp
1572 *
1573 * Return milliseconds since midnight in network byte order.
1574 */
1575 __be32 inet_current_timestamp(void)
1576 {
1577 u32 secs;
1578 u32 msecs;
1579 struct timespec64 ts;
1580
1581 ktime_get_real_ts64(&ts);
1582
1583 /* Get secs since midnight. */
1584 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1585 /* Convert to msecs. */
1586 msecs = secs * MSEC_PER_SEC;
1587 /* Convert nsec to msec. */
1588 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1589
1590 /* Convert to network byte order. */
1591 return htonl(msecs);
1592 }
1593 EXPORT_SYMBOL(inet_current_timestamp);
1594
1595 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1596 {
1597 if (sk->sk_family == AF_INET)
1598 return ip_recv_error(sk, msg, len, addr_len);
1599 #if IS_ENABLED(CONFIG_IPV6)
1600 if (sk->sk_family == AF_INET6)
1601 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1602 #endif
1603 return -EINVAL;
1604 }
1605
1606 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1607 {
1608 __be16 newlen = htons(skb->len - nhoff);
1609 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1610 const struct net_offload *ops;
1611 int proto = iph->protocol;
1612 int err = -ENOSYS;
1613
1614 if (skb->encapsulation) {
1615 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1616 skb_set_inner_network_header(skb, nhoff);
1617 }
1618
1619 csum_replace2(&iph->check, iph->tot_len, newlen);
1620 iph->tot_len = newlen;
1621
1622 rcu_read_lock();
1623 ops = rcu_dereference(inet_offloads[proto]);
1624 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1625 goto out_unlock;
1626
1627 /* Only need to add sizeof(*iph) to get to the next hdr below
1628 * because any hdr with option will have been flushed in
1629 * inet_gro_receive().
1630 */
1631 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1632 tcp4_gro_complete, udp4_gro_complete,
1633 skb, nhoff + sizeof(*iph));
1634
1635 out_unlock:
1636 rcu_read_unlock();
1637
1638 return err;
1639 }
1640
1641 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1642 {
1643 skb->encapsulation = 1;
1644 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1645 return inet_gro_complete(skb, nhoff);
1646 }
1647
1648 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1649 unsigned short type, unsigned char protocol,
1650 struct net *net)
1651 {
1652 struct socket *sock;
1653 int rc = sock_create_kern(net, family, type, protocol, &sock);
1654
1655 if (rc == 0) {
1656 *sk = sock->sk;
1657 (*sk)->sk_allocation = GFP_ATOMIC;
1658 /*
1659 * Unhash it so that IP input processing does not even see it,
1660 * we do not wish this socket to see incoming packets.
1661 */
1662 (*sk)->sk_prot->unhash(*sk);
1663 }
1664 return rc;
1665 }
1666 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1667
1668 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1669 {
1670 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1671 }
1672 EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1673
1674 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1675 {
1676 unsigned long res = 0;
1677 int i;
1678
1679 for_each_possible_cpu(i)
1680 res += snmp_get_cpu_field(mib, i, offt);
1681 return res;
1682 }
1683 EXPORT_SYMBOL_GPL(snmp_fold_field);
1684
1685 #if BITS_PER_LONG==32
1686
1687 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1688 size_t syncp_offset)
1689 {
1690 void *bhptr;
1691 struct u64_stats_sync *syncp;
1692 u64 v;
1693 unsigned int start;
1694
1695 bhptr = per_cpu_ptr(mib, cpu);
1696 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1697 do {
1698 start = u64_stats_fetch_begin_irq(syncp);
1699 v = *(((u64 *)bhptr) + offt);
1700 } while (u64_stats_fetch_retry_irq(syncp, start));
1701
1702 return v;
1703 }
1704 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1705
1706 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1707 {
1708 u64 res = 0;
1709 int cpu;
1710
1711 for_each_possible_cpu(cpu) {
1712 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1713 }
1714 return res;
1715 }
1716 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1717 #endif
1718
1719 #ifdef CONFIG_IP_MULTICAST
1720 static const struct net_protocol igmp_protocol = {
1721 .handler = igmp_rcv,
1722 .netns_ok = 1,
1723 };
1724 #endif
1725
1726 /* thinking of making this const? Don't.
1727 * early_demux can change based on sysctl.
1728 */
1729 static struct net_protocol tcp_protocol = {
1730 .early_demux = tcp_v4_early_demux,
1731 .early_demux_handler = tcp_v4_early_demux,
1732 .handler = tcp_v4_rcv,
1733 .err_handler = tcp_v4_err,
1734 .no_policy = 1,
1735 .netns_ok = 1,
1736 .icmp_strict_tag_validation = 1,
1737 };
1738
1739 /* thinking of making this const? Don't.
1740 * early_demux can change based on sysctl.
1741 */
1742 static struct net_protocol udp_protocol = {
1743 .early_demux = udp_v4_early_demux,
1744 .early_demux_handler = udp_v4_early_demux,
1745 .handler = udp_rcv,
1746 .err_handler = udp_err,
1747 .no_policy = 1,
1748 .netns_ok = 1,
1749 };
1750
1751 static const struct net_protocol icmp_protocol = {
1752 .handler = icmp_rcv,
1753 .err_handler = icmp_err,
1754 .no_policy = 1,
1755 .netns_ok = 1,
1756 };
1757
1758 static __net_init int ipv4_mib_init_net(struct net *net)
1759 {
1760 int i;
1761
1762 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1763 if (!net->mib.tcp_statistics)
1764 goto err_tcp_mib;
1765 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1766 if (!net->mib.ip_statistics)
1767 goto err_ip_mib;
1768
1769 for_each_possible_cpu(i) {
1770 struct ipstats_mib *af_inet_stats;
1771 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1772 u64_stats_init(&af_inet_stats->syncp);
1773 }
1774
1775 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1776 if (!net->mib.net_statistics)
1777 goto err_net_mib;
1778 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1779 if (!net->mib.udp_statistics)
1780 goto err_udp_mib;
1781 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1782 if (!net->mib.udplite_statistics)
1783 goto err_udplite_mib;
1784 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1785 if (!net->mib.icmp_statistics)
1786 goto err_icmp_mib;
1787 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1788 GFP_KERNEL);
1789 if (!net->mib.icmpmsg_statistics)
1790 goto err_icmpmsg_mib;
1791
1792 tcp_mib_init(net);
1793 return 0;
1794
1795 err_icmpmsg_mib:
1796 free_percpu(net->mib.icmp_statistics);
1797 err_icmp_mib:
1798 free_percpu(net->mib.udplite_statistics);
1799 err_udplite_mib:
1800 free_percpu(net->mib.udp_statistics);
1801 err_udp_mib:
1802 free_percpu(net->mib.net_statistics);
1803 err_net_mib:
1804 free_percpu(net->mib.ip_statistics);
1805 err_ip_mib:
1806 free_percpu(net->mib.tcp_statistics);
1807 err_tcp_mib:
1808 return -ENOMEM;
1809 }
1810
1811 static __net_exit void ipv4_mib_exit_net(struct net *net)
1812 {
1813 kfree(net->mib.icmpmsg_statistics);
1814 free_percpu(net->mib.icmp_statistics);
1815 free_percpu(net->mib.udplite_statistics);
1816 free_percpu(net->mib.udp_statistics);
1817 free_percpu(net->mib.net_statistics);
1818 free_percpu(net->mib.ip_statistics);
1819 free_percpu(net->mib.tcp_statistics);
1820 #ifdef CONFIG_MPTCP
1821 /* allocated on demand, see mptcp_init_sock() */
1822 free_percpu(net->mib.mptcp_statistics);
1823 #endif
1824 }
1825
1826 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1827 .init = ipv4_mib_init_net,
1828 .exit = ipv4_mib_exit_net,
1829 };
1830
1831 static int __init init_ipv4_mibs(void)
1832 {
1833 return register_pernet_subsys(&ipv4_mib_ops);
1834 }
1835
1836 static __net_init int inet_init_net(struct net *net)
1837 {
1838 /*
1839 * Set defaults for local port range
1840 */
1841 seqlock_init(&net->ipv4.ip_local_ports.lock);
1842 net->ipv4.ip_local_ports.range[0] = 32768;
1843 net->ipv4.ip_local_ports.range[1] = 60999;
1844
1845 seqlock_init(&net->ipv4.ping_group_range.lock);
1846 /*
1847 * Sane defaults - nobody may create ping sockets.
1848 * Boot scripts should set this to distro-specific group.
1849 */
1850 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1851 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1852
1853 /* Default values for sysctl-controlled parameters.
1854 * We set them here, in case sysctl is not compiled.
1855 */
1856 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1857 net->ipv4.sysctl_ip_fwd_update_priority = 1;
1858 net->ipv4.sysctl_ip_dynaddr = 0;
1859 net->ipv4.sysctl_ip_early_demux = 1;
1860 net->ipv4.sysctl_udp_early_demux = 1;
1861 net->ipv4.sysctl_tcp_early_demux = 1;
1862 net->ipv4.sysctl_nexthop_compat_mode = 1;
1863 #ifdef CONFIG_SYSCTL
1864 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1865 #endif
1866
1867 /* Some igmp sysctl, whose values are always used */
1868 net->ipv4.sysctl_igmp_max_memberships = 20;
1869 net->ipv4.sysctl_igmp_max_msf = 10;
1870 /* IGMP reports for link-local multicast groups are enabled by default */
1871 net->ipv4.sysctl_igmp_llm_reports = 1;
1872 net->ipv4.sysctl_igmp_qrv = 2;
1873
1874 net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1875
1876 return 0;
1877 }
1878
1879 static __net_initdata struct pernet_operations af_inet_ops = {
1880 .init = inet_init_net,
1881 };
1882
1883 static int __init init_inet_pernet_ops(void)
1884 {
1885 return register_pernet_subsys(&af_inet_ops);
1886 }
1887
1888 static int ipv4_proc_init(void);
1889
1890 /*
1891 * IP protocol layer initialiser
1892 */
1893
1894 static struct packet_offload ip_packet_offload __read_mostly = {
1895 .type = cpu_to_be16(ETH_P_IP),
1896 .callbacks = {
1897 .gso_segment = inet_gso_segment,
1898 .gro_receive = inet_gro_receive,
1899 .gro_complete = inet_gro_complete,
1900 },
1901 };
1902
1903 static const struct net_offload ipip_offload = {
1904 .callbacks = {
1905 .gso_segment = ipip_gso_segment,
1906 .gro_receive = ipip_gro_receive,
1907 .gro_complete = ipip_gro_complete,
1908 },
1909 };
1910
1911 static int __init ipip_offload_init(void)
1912 {
1913 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1914 }
1915
1916 static int __init ipv4_offload_init(void)
1917 {
1918 /*
1919 * Add offloads
1920 */
1921 if (udpv4_offload_init() < 0)
1922 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1923 if (tcpv4_offload_init() < 0)
1924 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1925 if (ipip_offload_init() < 0)
1926 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1927
1928 dev_add_offload(&ip_packet_offload);
1929 return 0;
1930 }
1931
1932 fs_initcall(ipv4_offload_init);
1933
1934 static struct packet_type ip_packet_type __read_mostly = {
1935 .type = cpu_to_be16(ETH_P_IP),
1936 .func = ip_rcv,
1937 .list_func = ip_list_rcv,
1938 };
1939
1940 static int __init inet_init(void)
1941 {
1942 struct inet_protosw *q;
1943 struct list_head *r;
1944 int rc;
1945
1946 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1947
1948 rc = proto_register(&tcp_prot, 1);
1949 if (rc)
1950 goto out;
1951
1952 rc = proto_register(&udp_prot, 1);
1953 if (rc)
1954 goto out_unregister_tcp_proto;
1955
1956 rc = proto_register(&raw_prot, 1);
1957 if (rc)
1958 goto out_unregister_udp_proto;
1959
1960 rc = proto_register(&ping_prot, 1);
1961 if (rc)
1962 goto out_unregister_raw_proto;
1963
1964 /*
1965 * Tell SOCKET that we are alive...
1966 */
1967
1968 (void)sock_register(&inet_family_ops);
1969
1970 #ifdef CONFIG_SYSCTL
1971 ip_static_sysctl_init();
1972 #endif
1973
1974 /*
1975 * Add all the base protocols.
1976 */
1977
1978 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1979 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1980 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1981 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1982 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1983 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1984 #ifdef CONFIG_IP_MULTICAST
1985 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1986 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1987 #endif
1988
1989 /* Register the socket-side information for inet_create. */
1990 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1991 INIT_LIST_HEAD(r);
1992
1993 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1994 inet_register_protosw(q);
1995
1996 /*
1997 * Set the ARP module up
1998 */
1999
2000 arp_init();
2001
2002 /*
2003 * Set the IP module up
2004 */
2005
2006 ip_init();
2007
2008 /* Setup TCP slab cache for open requests. */
2009 tcp_init();
2010
2011 /* Setup UDP memory threshold */
2012 udp_init();
2013
2014 /* Add UDP-Lite (RFC 3828) */
2015 udplite4_register();
2016
2017 raw_init();
2018
2019 ping_init();
2020
2021 /*
2022 * Set the ICMP layer up
2023 */
2024
2025 if (icmp_init() < 0)
2026 panic("Failed to create the ICMP control socket.\n");
2027
2028 /*
2029 * Initialise the multicast router
2030 */
2031 #if defined(CONFIG_IP_MROUTE)
2032 if (ip_mr_init())
2033 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2034 #endif
2035
2036 if (init_inet_pernet_ops())
2037 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2038 /*
2039 * Initialise per-cpu ipv4 mibs
2040 */
2041
2042 if (init_ipv4_mibs())
2043 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
2044
2045 ipv4_proc_init();
2046
2047 ipfrag_init();
2048
2049 dev_add_pack(&ip_packet_type);
2050
2051 ip_tunnel_core_init();
2052
2053 rc = 0;
2054 out:
2055 return rc;
2056 out_unregister_raw_proto:
2057 proto_unregister(&raw_prot);
2058 out_unregister_udp_proto:
2059 proto_unregister(&udp_prot);
2060 out_unregister_tcp_proto:
2061 proto_unregister(&tcp_prot);
2062 goto out;
2063 }
2064
2065 fs_initcall(inet_init);
2066
2067 /* ------------------------------------------------------------------------ */
2068
2069 #ifdef CONFIG_PROC_FS
2070 static int __init ipv4_proc_init(void)
2071 {
2072 int rc = 0;
2073
2074 if (raw_proc_init())
2075 goto out_raw;
2076 if (tcp4_proc_init())
2077 goto out_tcp;
2078 if (udp4_proc_init())
2079 goto out_udp;
2080 if (ping_proc_init())
2081 goto out_ping;
2082 if (ip_misc_proc_init())
2083 goto out_misc;
2084 out:
2085 return rc;
2086 out_misc:
2087 ping_proc_exit();
2088 out_ping:
2089 udp4_proc_exit();
2090 out_udp:
2091 tcp4_proc_exit();
2092 out_tcp:
2093 raw_proc_exit();
2094 out_raw:
2095 rc = -ENOMEM;
2096 goto out;
2097 }
2098
2099 #else /* CONFIG_PROC_FS */
2100 static int __init ipv4_proc_init(void)
2101 {
2102 return 0;
2103 }
2104 #endif /* CONFIG_PROC_FS */
2105
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