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 /* Keep the definition of IPv6 disable here for now, to avoid annoying linker
128 * issues in case IPv6=m
129 */
130 int disable_ipv6_mod;
131 EXPORT_SYMBOL(disable_ipv6_mod);
132
133 /* The inetsw table contains everything that inet_create needs to
134 * build a new socket.
135 */
136 static struct list_head inetsw[SOCK_MAX];
137 static DEFINE_SPINLOCK(inetsw_lock);
138
139 /* New destruction routine */
140
inet_sock_destruct(struct sock * sk)141 void inet_sock_destruct(struct sock *sk)
142 {
143 struct inet_sock *inet = inet_sk(sk);
144
145 __skb_queue_purge(&sk->sk_receive_queue);
146 __skb_queue_purge(&sk->sk_error_queue);
147
148 sk_mem_reclaim_final(sk);
149
150 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
151 pr_err("Attempt to release TCP socket in state %d %p\n",
152 sk->sk_state, sk);
153 return;
154 }
155 if (!sock_flag(sk, SOCK_DEAD)) {
156 pr_err("Attempt to release alive inet socket %p\n", sk);
157 return;
158 }
159
160 WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc));
161 WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc));
162 WARN_ON_ONCE(sk->sk_wmem_queued);
163 WARN_ON_ONCE(sk->sk_forward_alloc);
164
165 kfree(rcu_dereference_protected(inet->inet_opt, 1));
166 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
167 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1));
168 psp_sk_assoc_free(sk);
169 }
170 EXPORT_SYMBOL(inet_sock_destruct);
171
172 /*
173 * The routines beyond this point handle the behaviour of an AF_INET
174 * socket object. Mostly it punts to the subprotocols of IP to do
175 * the work.
176 */
177
178 /*
179 * Automatically bind an unbound socket.
180 */
181
inet_autobind(struct sock * sk)182 static int inet_autobind(struct sock *sk)
183 {
184 struct inet_sock *inet;
185 /* We may need to bind the socket. */
186 lock_sock(sk);
187 inet = inet_sk(sk);
188 if (!inet->inet_num) {
189 if (sk->sk_prot->get_port(sk, 0)) {
190 release_sock(sk);
191 return -EAGAIN;
192 }
193 inet->inet_sport = htons(inet->inet_num);
194 }
195 release_sock(sk);
196 return 0;
197 }
198
__inet_listen_sk(struct sock * sk,int backlog)199 int __inet_listen_sk(struct sock *sk, int backlog)
200 {
201 unsigned char old_state = sk->sk_state;
202 int err, tcp_fastopen;
203
204 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
205 return -EINVAL;
206
207 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
208 /* Really, if the socket is already in listen state
209 * we can only allow the backlog to be adjusted.
210 */
211 if (old_state != TCP_LISTEN) {
212 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
213 * Note that only TCP sockets (SOCK_STREAM) will reach here.
214 * Also fastopen backlog may already been set via the option
215 * because the socket was in TCP_LISTEN state previously but
216 * was shutdown() rather than close().
217 */
218 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen);
219 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
220 (tcp_fastopen & TFO_SERVER_ENABLE) &&
221 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
222 fastopen_queue_tune(sk, backlog);
223 tcp_fastopen_init_key_once(sock_net(sk));
224 }
225
226 err = inet_csk_listen_start(sk);
227 if (err)
228 return err;
229
230 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
231 }
232 return 0;
233 }
234
235 /*
236 * Move a socket into listening state.
237 */
inet_listen(struct socket * sock,int backlog)238 int inet_listen(struct socket *sock, int backlog)
239 {
240 struct sock *sk = sock->sk;
241 int err = -EINVAL;
242
243 lock_sock(sk);
244
245 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
246 goto out;
247
248 err = __inet_listen_sk(sk, backlog);
249
250 out:
251 release_sock(sk);
252 return err;
253 }
254 EXPORT_SYMBOL(inet_listen);
255
256 /*
257 * Create an inet socket.
258 */
259
inet_create(struct net * net,struct socket * sock,int protocol,int kern)260 static int inet_create(struct net *net, struct socket *sock, int protocol,
261 int kern)
262 {
263 struct sock *sk;
264 struct inet_protosw *answer;
265 struct inet_sock *inet;
266 struct proto *answer_prot;
267 unsigned char answer_flags;
268 int try_loading_module = 0;
269 int err;
270
271 if (protocol < 0 || protocol >= IPPROTO_MAX)
272 return -EINVAL;
273
274 sock->state = SS_UNCONNECTED;
275
276 /* Look for the requested type/protocol pair. */
277 lookup_protocol:
278 err = -ESOCKTNOSUPPORT;
279 rcu_read_lock();
280 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
281
282 err = 0;
283 /* Check the non-wild match. */
284 if (protocol == answer->protocol) {
285 if (protocol != IPPROTO_IP)
286 break;
287 } else {
288 /* Check for the two wild cases. */
289 if (IPPROTO_IP == protocol) {
290 protocol = answer->protocol;
291 break;
292 }
293 if (IPPROTO_IP == answer->protocol)
294 break;
295 }
296 err = -EPROTONOSUPPORT;
297 }
298
299 if (unlikely(err)) {
300 if (try_loading_module < 2) {
301 rcu_read_unlock();
302 /*
303 * Be more specific, e.g. net-pf-2-proto-132-type-1
304 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
305 */
306 if (++try_loading_module == 1)
307 request_module("net-pf-%d-proto-%d-type-%d",
308 PF_INET, protocol, sock->type);
309 /*
310 * Fall back to generic, e.g. net-pf-2-proto-132
311 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
312 */
313 else
314 request_module("net-pf-%d-proto-%d",
315 PF_INET, protocol);
316 goto lookup_protocol;
317 } else
318 goto out_rcu_unlock;
319 }
320
321 err = -EPERM;
322 if (sock->type == SOCK_RAW && !kern &&
323 !ns_capable(net->user_ns, CAP_NET_RAW))
324 goto out_rcu_unlock;
325
326 sock->ops = answer->ops;
327 answer_prot = answer->prot;
328 answer_flags = answer->flags;
329 rcu_read_unlock();
330
331 WARN_ON(!answer_prot->slab);
332
333 err = -ENOMEM;
334 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
335 if (!sk)
336 goto out;
337
338 err = 0;
339 if (INET_PROTOSW_REUSE & answer_flags)
340 sk->sk_reuse = SK_CAN_REUSE;
341
342 if (INET_PROTOSW_ICSK & answer_flags)
343 inet_init_csk_locks(sk);
344
345 inet = inet_sk(sk);
346 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
347
348 inet_clear_bit(NODEFRAG, sk);
349
350 if (SOCK_RAW == sock->type) {
351 inet->inet_num = protocol;
352 if (IPPROTO_RAW == protocol)
353 inet_set_bit(HDRINCL, sk);
354 }
355
356 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
357 inet->pmtudisc = IP_PMTUDISC_DONT;
358 else
359 inet->pmtudisc = IP_PMTUDISC_WANT;
360
361 atomic_set(&inet->inet_id, 0);
362
363 sock_init_data(sock, sk);
364
365 sk->sk_destruct = inet_sock_destruct;
366 sk->sk_protocol = protocol;
367 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
368 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
369
370 inet->uc_ttl = -1;
371 inet_set_bit(MC_LOOP, sk);
372 inet->mc_ttl = 1;
373 inet_set_bit(MC_ALL, sk);
374 inet->mc_index = 0;
375 inet->mc_list = NULL;
376 inet->rcv_tos = 0;
377
378 if (inet->inet_num) {
379 /* It assumes that any protocol which allows
380 * the user to assign a number at socket
381 * creation time automatically
382 * shares.
383 */
384 inet->inet_sport = htons(inet->inet_num);
385 /* Add to protocol hash chains. */
386 err = sk->sk_prot->hash(sk);
387 if (err)
388 goto out_sk_release;
389 }
390
391 if (sk->sk_prot->init) {
392 err = sk->sk_prot->init(sk);
393 if (err)
394 goto out_sk_release;
395 }
396
397 if (!kern) {
398 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
399 if (err)
400 goto out_sk_release;
401 }
402 out:
403 return err;
404 out_rcu_unlock:
405 rcu_read_unlock();
406 goto out;
407 out_sk_release:
408 sk_common_release(sk);
409 sock->sk = NULL;
410 goto out;
411 }
412
413
414 /*
415 * The peer socket should always be NULL (or else). When we call this
416 * function we are destroying the object and from then on nobody
417 * should refer to it.
418 */
inet_release(struct socket * sock)419 int inet_release(struct socket *sock)
420 {
421 struct sock *sk = sock->sk;
422
423 if (sk) {
424 long timeout;
425
426 if (!sk->sk_kern_sock)
427 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
428
429 /* Applications forget to leave groups before exiting */
430 ip_mc_drop_socket(sk);
431
432 /* If linger is set, we don't return until the close
433 * is complete. Otherwise we return immediately. The
434 * actually closing is done the same either way.
435 *
436 * If the close is due to the process exiting, we never
437 * linger..
438 */
439 timeout = 0;
440 if (sock_flag(sk, SOCK_LINGER) &&
441 !(current->flags & PF_EXITING))
442 timeout = sk->sk_lingertime;
443 sk->sk_prot->close(sk, timeout);
444 sock->sk = NULL;
445 }
446 return 0;
447 }
448 EXPORT_SYMBOL(inet_release);
449
inet_bind_sk(struct sock * sk,struct sockaddr_unsized * uaddr,int addr_len)450 int inet_bind_sk(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len)
451 {
452 u32 flags = BIND_WITH_LOCK;
453 int err;
454
455 /* If the socket has its own bind function then use it. (RAW) */
456 if (sk->sk_prot->bind) {
457 return sk->sk_prot->bind(sk, uaddr, addr_len);
458 }
459 if (addr_len < sizeof(struct sockaddr_in))
460 return -EINVAL;
461
462 /* BPF prog is run before any checks are done so that if the prog
463 * changes context in a wrong way it will be caught.
464 */
465 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
466 CGROUP_INET4_BIND, &flags);
467 if (err)
468 return err;
469
470 return __inet_bind(sk, uaddr, addr_len, flags);
471 }
472
inet_bind(struct socket * sock,struct sockaddr_unsized * uaddr,int addr_len)473 int inet_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len)
474 {
475 return inet_bind_sk(sock->sk, uaddr, addr_len);
476 }
477 EXPORT_SYMBOL(inet_bind);
478
__inet_bind(struct sock * sk,struct sockaddr_unsized * uaddr,int addr_len,u32 flags)479 int __inet_bind(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len,
480 u32 flags)
481 {
482 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
483 struct inet_sock *inet = inet_sk(sk);
484 struct net *net = sock_net(sk);
485 unsigned short snum;
486 int chk_addr_ret;
487 u32 tb_id = RT_TABLE_LOCAL;
488 int err;
489
490 if (addr->sin_family != AF_INET) {
491 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
492 * only if s_addr is INADDR_ANY.
493 */
494 err = -EAFNOSUPPORT;
495 if (addr->sin_family != AF_UNSPEC ||
496 addr->sin_addr.s_addr != htonl(INADDR_ANY))
497 goto out;
498 }
499
500 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
501 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
502
503 /* Not specified by any standard per-se, however it breaks too
504 * many applications when removed. It is unfortunate since
505 * allowing applications to make a non-local bind solves
506 * several problems with systems using dynamic addressing.
507 * (ie. your servers still start up even if your ISDN link
508 * is temporarily down)
509 */
510 err = -EADDRNOTAVAIL;
511 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
512 chk_addr_ret))
513 goto out;
514
515 snum = ntohs(addr->sin_port);
516 err = -EACCES;
517 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
518 snum && inet_port_requires_bind_service(net, snum) &&
519 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
520 goto out;
521
522 /* We keep a pair of addresses. rcv_saddr is the one
523 * used by hash lookups, and saddr is used for transmit.
524 *
525 * In the BSD API these are the same except where it
526 * would be illegal to use them (multicast/broadcast) in
527 * which case the sending device address is used.
528 */
529 if (flags & BIND_WITH_LOCK)
530 lock_sock(sk);
531
532 /* Check these errors (active socket, double bind). */
533 err = -EINVAL;
534 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
535 goto out_release_sock;
536
537 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
538 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
539 inet->inet_saddr = 0; /* Use device */
540
541 /* Make sure we are allowed to bind here. */
542 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
543 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
544 err = sk->sk_prot->get_port(sk, snum);
545 if (err) {
546 inet->inet_saddr = inet->inet_rcv_saddr = 0;
547 goto out_release_sock;
548 }
549 if (!(flags & BIND_FROM_BPF)) {
550 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
551 if (err) {
552 inet->inet_saddr = inet->inet_rcv_saddr = 0;
553 if (sk->sk_prot->put_port)
554 sk->sk_prot->put_port(sk);
555 goto out_release_sock;
556 }
557 }
558 }
559
560 if (inet->inet_rcv_saddr)
561 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
562 if (snum)
563 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
564 inet->inet_sport = htons(inet->inet_num);
565 inet->inet_daddr = 0;
566 inet->inet_dport = 0;
567 sk_dst_reset(sk);
568 err = 0;
569 out_release_sock:
570 if (flags & BIND_WITH_LOCK)
571 release_sock(sk);
572 out:
573 return err;
574 }
575
inet_dgram_connect(struct socket * sock,struct sockaddr_unsized * uaddr,int addr_len,int flags)576 int inet_dgram_connect(struct socket *sock, struct sockaddr_unsized *uaddr,
577 int addr_len, int flags)
578 {
579 struct sock *sk = sock->sk;
580 const struct proto *prot;
581 int err;
582
583 if (addr_len < sizeof(uaddr->sa_family))
584 return -EINVAL;
585
586 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
587 prot = READ_ONCE(sk->sk_prot);
588
589 if (uaddr->sa_family == AF_UNSPEC)
590 return prot->disconnect(sk, flags);
591
592 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
593 err = prot->pre_connect(sk, uaddr, addr_len);
594 if (err)
595 return err;
596 }
597
598 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
599 return -EAGAIN;
600 return prot->connect(sk, uaddr, addr_len);
601 }
602 EXPORT_SYMBOL(inet_dgram_connect);
603
inet_wait_for_connect(struct sock * sk,long timeo,int writebias)604 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
605 {
606 DEFINE_WAIT_FUNC(wait, woken_wake_function);
607
608 add_wait_queue(sk_sleep(sk), &wait);
609 sk->sk_write_pending += writebias;
610
611 /* Basic assumption: if someone sets sk->sk_err, he _must_
612 * change state of the socket from TCP_SYN_*.
613 * Connect() does not allow to get error notifications
614 * without closing the socket.
615 */
616 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
617 release_sock(sk);
618 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
619 lock_sock(sk);
620 if (signal_pending(current) || !timeo)
621 break;
622 }
623 remove_wait_queue(sk_sleep(sk), &wait);
624 sk->sk_write_pending -= writebias;
625 return timeo;
626 }
627
628 /*
629 * Connect to a remote host. There is regrettably still a little
630 * TCP 'magic' in here.
631 */
__inet_stream_connect(struct socket * sock,struct sockaddr_unsized * uaddr,int addr_len,int flags,int is_sendmsg)632 int __inet_stream_connect(struct socket *sock, struct sockaddr_unsized *uaddr,
633 int addr_len, int flags, int is_sendmsg)
634 {
635 struct sock *sk = sock->sk;
636 int err;
637 long timeo;
638
639 /*
640 * uaddr can be NULL and addr_len can be 0 if:
641 * sk is a TCP fastopen active socket and
642 * TCP_FASTOPEN_CONNECT sockopt is set and
643 * we already have a valid cookie for this socket.
644 * In this case, user can call write() after connect().
645 * write() will invoke tcp_sendmsg_fastopen() which calls
646 * __inet_stream_connect().
647 */
648 if (uaddr) {
649 if (addr_len < sizeof(uaddr->sa_family))
650 return -EINVAL;
651
652 if (uaddr->sa_family == AF_UNSPEC) {
653 sk->sk_disconnects++;
654 err = sk->sk_prot->disconnect(sk, flags);
655 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
656 goto out;
657 }
658 }
659
660 switch (sock->state) {
661 default:
662 err = -EINVAL;
663 goto out;
664 case SS_CONNECTED:
665 err = -EISCONN;
666 goto out;
667 case SS_CONNECTING:
668 if (inet_test_bit(DEFER_CONNECT, sk))
669 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
670 else
671 err = -EALREADY;
672 /* Fall out of switch with err, set for this state */
673 break;
674 case SS_UNCONNECTED:
675 err = -EISCONN;
676 if (sk->sk_state != TCP_CLOSE)
677 goto out;
678
679 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
680 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
681 if (err)
682 goto out;
683 }
684
685 err = sk->sk_prot->connect(sk, uaddr, addr_len);
686 if (err < 0)
687 goto out;
688
689 sock->state = SS_CONNECTING;
690
691 if (!err && inet_test_bit(DEFER_CONNECT, sk))
692 goto out;
693
694 /* Just entered SS_CONNECTING state; the only
695 * difference is that return value in non-blocking
696 * case is EINPROGRESS, rather than EALREADY.
697 */
698 err = -EINPROGRESS;
699 break;
700 }
701
702 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
703
704 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
705 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
706 tcp_sk(sk)->fastopen_req &&
707 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
708 int dis = sk->sk_disconnects;
709
710 /* Error code is set above */
711 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
712 goto out;
713
714 err = sock_intr_errno(timeo);
715 if (signal_pending(current))
716 goto out;
717
718 if (dis != sk->sk_disconnects) {
719 err = -EPIPE;
720 goto out;
721 }
722 }
723
724 /* Connection was closed by RST, timeout, ICMP error
725 * or another process disconnected us.
726 */
727 if (sk->sk_state == TCP_CLOSE)
728 goto sock_error;
729
730 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
731 * and error was received after socket entered established state.
732 * Hence, it is handled normally after connect() return successfully.
733 */
734
735 sock->state = SS_CONNECTED;
736 err = 0;
737 out:
738 return err;
739
740 sock_error:
741 err = sock_error(sk) ? : -ECONNABORTED;
742 sock->state = SS_UNCONNECTED;
743 sk->sk_disconnects++;
744 if (sk->sk_prot->disconnect(sk, flags))
745 sock->state = SS_DISCONNECTING;
746 goto out;
747 }
748 EXPORT_SYMBOL(__inet_stream_connect);
749
inet_stream_connect(struct socket * sock,struct sockaddr_unsized * uaddr,int addr_len,int flags)750 int inet_stream_connect(struct socket *sock, struct sockaddr_unsized *uaddr,
751 int addr_len, int flags)
752 {
753 int err;
754
755 lock_sock(sock->sk);
756 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
757 release_sock(sock->sk);
758 return err;
759 }
760 EXPORT_SYMBOL(inet_stream_connect);
761
__inet_accept(struct socket * sock,struct socket * newsock,struct sock * newsk)762 void __inet_accept(struct socket *sock, struct socket *newsock, struct sock *newsk)
763 {
764 if (mem_cgroup_sockets_enabled) {
765 mem_cgroup_sk_alloc(newsk);
766 __sk_charge(newsk, GFP_KERNEL);
767 }
768
769 sock_rps_record_flow(newsk);
770 WARN_ON(!((1 << newsk->sk_state) &
771 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
772 TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 |
773 TCPF_CLOSING | TCPF_CLOSE_WAIT |
774 TCPF_CLOSE)));
775
776 if (test_bit(SOCK_SUPPORT_ZC, &sock->flags))
777 set_bit(SOCK_SUPPORT_ZC, &newsock->flags);
778 sock_graft(newsk, newsock);
779
780 newsock->state = SS_CONNECTED;
781 }
782 EXPORT_SYMBOL_GPL(__inet_accept);
783
784 /*
785 * Accept a pending connection. The TCP layer now gives BSD semantics.
786 */
787
inet_accept(struct socket * sock,struct socket * newsock,struct proto_accept_arg * arg)788 int inet_accept(struct socket *sock, struct socket *newsock,
789 struct proto_accept_arg *arg)
790 {
791 struct sock *sk1 = sock->sk, *sk2;
792
793 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
794 arg->err = -EINVAL;
795 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, arg);
796 if (!sk2)
797 return arg->err;
798
799 lock_sock(sk2);
800 __inet_accept(sock, newsock, sk2);
801 release_sock(sk2);
802 return 0;
803 }
804 EXPORT_SYMBOL(inet_accept);
805
806 /*
807 * This does both peername and sockname.
808 */
inet_getname(struct socket * sock,struct sockaddr * uaddr,int peer)809 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
810 int peer)
811 {
812 struct sock *sk = sock->sk;
813 struct inet_sock *inet = inet_sk(sk);
814 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
815 int sin_addr_len = sizeof(*sin);
816
817 sin->sin_family = AF_INET;
818 lock_sock(sk);
819 if (peer) {
820 if (!inet->inet_dport ||
821 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
822 peer == 1)) {
823 release_sock(sk);
824 return -ENOTCONN;
825 }
826 sin->sin_port = inet->inet_dport;
827 sin->sin_addr.s_addr = inet->inet_daddr;
828 BPF_CGROUP_RUN_SA_PROG(sk, sin, &sin_addr_len,
829 CGROUP_INET4_GETPEERNAME);
830 } else {
831 __be32 addr = inet->inet_rcv_saddr;
832 if (!addr)
833 addr = inet->inet_saddr;
834 sin->sin_port = inet->inet_sport;
835 sin->sin_addr.s_addr = addr;
836 BPF_CGROUP_RUN_SA_PROG(sk, sin, &sin_addr_len,
837 CGROUP_INET4_GETSOCKNAME);
838 }
839 release_sock(sk);
840 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
841 return sin_addr_len;
842 }
843 EXPORT_SYMBOL(inet_getname);
844
inet_send_prepare(struct sock * sk)845 int inet_send_prepare(struct sock *sk)
846 {
847 sock_rps_record_flow(sk);
848
849 /* We may need to bind the socket. */
850 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
851 inet_autobind(sk))
852 return -EAGAIN;
853
854 return 0;
855 }
856 EXPORT_SYMBOL_GPL(inet_send_prepare);
857
inet_sendmsg(struct socket * sock,struct msghdr * msg,size_t size)858 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
859 {
860 struct sock *sk = sock->sk;
861
862 if (unlikely(inet_send_prepare(sk)))
863 return -EAGAIN;
864
865 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
866 sk, msg, size);
867 }
868 EXPORT_SYMBOL(inet_sendmsg);
869
inet_splice_eof(struct socket * sock)870 void inet_splice_eof(struct socket *sock)
871 {
872 const struct proto *prot;
873 struct sock *sk = sock->sk;
874
875 if (unlikely(inet_send_prepare(sk)))
876 return;
877
878 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
879 prot = READ_ONCE(sk->sk_prot);
880 if (prot->splice_eof)
881 prot->splice_eof(sock);
882 }
883 EXPORT_SYMBOL_GPL(inet_splice_eof);
884
885 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
886 size_t, int, int *));
inet_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)887 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
888 int flags)
889 {
890 struct sock *sk = sock->sk;
891 int addr_len = 0;
892 int err;
893
894 if (likely(!(flags & MSG_ERRQUEUE)))
895 sock_rps_record_flow(sk);
896
897 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
898 sk, msg, size, flags, &addr_len);
899 if (err >= 0)
900 msg->msg_namelen = addr_len;
901 return err;
902 }
903 EXPORT_SYMBOL(inet_recvmsg);
904
inet_shutdown(struct socket * sock,int how)905 int inet_shutdown(struct socket *sock, int how)
906 {
907 struct sock *sk = sock->sk;
908 int err = 0;
909
910 /* This should really check to make sure
911 * the socket is a TCP socket. (WHY AC...)
912 */
913 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
914 1->2 bit 2 snds.
915 2->3 */
916 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
917 return -EINVAL;
918
919 lock_sock(sk);
920 if (sock->state == SS_CONNECTING) {
921 if ((1 << sk->sk_state) &
922 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
923 sock->state = SS_DISCONNECTING;
924 else
925 sock->state = SS_CONNECTED;
926 }
927
928 switch (sk->sk_state) {
929 case TCP_CLOSE:
930 err = -ENOTCONN;
931 /* Hack to wake up other listeners, who can poll for
932 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
933 fallthrough;
934 default:
935 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how);
936 if (sk->sk_prot->shutdown)
937 sk->sk_prot->shutdown(sk, how);
938 break;
939
940 /* Remaining two branches are temporary solution for missing
941 * close() in multithreaded environment. It is _not_ a good idea,
942 * but we have no choice until close() is repaired at VFS level.
943 */
944 case TCP_LISTEN:
945 if (!(how & RCV_SHUTDOWN))
946 break;
947 fallthrough;
948 case TCP_SYN_SENT:
949 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
950 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
951 break;
952 }
953
954 /* Wake up anyone sleeping in poll. */
955 sk->sk_state_change(sk);
956 release_sock(sk);
957 return err;
958 }
959 EXPORT_SYMBOL(inet_shutdown);
960
961 /*
962 * ioctl() calls you can issue on an INET socket. Most of these are
963 * device configuration and stuff and very rarely used. Some ioctls
964 * pass on to the socket itself.
965 *
966 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
967 * loads the devconfigure module does its configuring and unloads it.
968 * There's a good 20K of config code hanging around the kernel.
969 */
970
inet_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)971 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
972 {
973 struct sock *sk = sock->sk;
974 int err = 0;
975 struct net *net = sock_net(sk);
976 void __user *p = (void __user *)arg;
977 struct ifreq ifr;
978 struct rtentry rt;
979
980 switch (cmd) {
981 case SIOCADDRT:
982 case SIOCDELRT:
983 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
984 return -EFAULT;
985 err = ip_rt_ioctl(net, cmd, &rt);
986 break;
987 case SIOCRTMSG:
988 err = -EINVAL;
989 break;
990 case SIOCDARP:
991 case SIOCGARP:
992 case SIOCSARP:
993 err = arp_ioctl(net, cmd, (void __user *)arg);
994 break;
995 case SIOCGIFADDR:
996 case SIOCGIFBRDADDR:
997 case SIOCGIFNETMASK:
998 case SIOCGIFDSTADDR:
999 case SIOCGIFPFLAGS:
1000 if (get_user_ifreq(&ifr, NULL, p))
1001 return -EFAULT;
1002 err = devinet_ioctl(net, cmd, &ifr);
1003 if (!err && put_user_ifreq(&ifr, p))
1004 err = -EFAULT;
1005 break;
1006
1007 case SIOCSIFADDR:
1008 case SIOCSIFBRDADDR:
1009 case SIOCSIFNETMASK:
1010 case SIOCSIFDSTADDR:
1011 case SIOCSIFPFLAGS:
1012 case SIOCSIFFLAGS:
1013 if (get_user_ifreq(&ifr, NULL, p))
1014 return -EFAULT;
1015 err = devinet_ioctl(net, cmd, &ifr);
1016 break;
1017 default:
1018 if (sk->sk_prot->ioctl)
1019 err = sk_ioctl(sk, cmd, (void __user *)arg);
1020 else
1021 err = -ENOIOCTLCMD;
1022 break;
1023 }
1024 return err;
1025 }
1026 EXPORT_SYMBOL(inet_ioctl);
1027
1028 #ifdef CONFIG_COMPAT
inet_compat_routing_ioctl(struct sock * sk,unsigned int cmd,struct compat_rtentry __user * ur)1029 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
1030 struct compat_rtentry __user *ur)
1031 {
1032 compat_uptr_t rtdev;
1033 struct rtentry rt;
1034
1035 if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
1036 3 * sizeof(struct sockaddr)) ||
1037 get_user(rt.rt_flags, &ur->rt_flags) ||
1038 get_user(rt.rt_metric, &ur->rt_metric) ||
1039 get_user(rt.rt_mtu, &ur->rt_mtu) ||
1040 get_user(rt.rt_window, &ur->rt_window) ||
1041 get_user(rt.rt_irtt, &ur->rt_irtt) ||
1042 get_user(rtdev, &ur->rt_dev))
1043 return -EFAULT;
1044
1045 rt.rt_dev = compat_ptr(rtdev);
1046 return ip_rt_ioctl(sock_net(sk), cmd, &rt);
1047 }
1048
inet_compat_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1049 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1050 {
1051 void __user *argp = compat_ptr(arg);
1052 struct sock *sk = sock->sk;
1053
1054 switch (cmd) {
1055 case SIOCADDRT:
1056 case SIOCDELRT:
1057 return inet_compat_routing_ioctl(sk, cmd, argp);
1058 default:
1059 if (!sk->sk_prot->compat_ioctl)
1060 return -ENOIOCTLCMD;
1061 return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1062 }
1063 }
1064 #endif /* CONFIG_COMPAT */
1065
1066 const struct proto_ops inet_stream_ops = {
1067 .family = PF_INET,
1068 .owner = THIS_MODULE,
1069 .release = inet_release,
1070 .bind = inet_bind,
1071 .connect = inet_stream_connect,
1072 .socketpair = sock_no_socketpair,
1073 .accept = inet_accept,
1074 .getname = inet_getname,
1075 .poll = tcp_poll,
1076 .ioctl = inet_ioctl,
1077 .gettstamp = sock_gettstamp,
1078 .listen = inet_listen,
1079 .shutdown = inet_shutdown,
1080 .setsockopt = sock_common_setsockopt,
1081 .getsockopt = sock_common_getsockopt,
1082 .sendmsg = inet_sendmsg,
1083 .recvmsg = inet_recvmsg,
1084 #ifdef CONFIG_MMU
1085 .mmap = tcp_mmap,
1086 #endif
1087 .splice_eof = inet_splice_eof,
1088 .splice_read = tcp_splice_read,
1089 .set_peek_off = sk_set_peek_off,
1090 .read_sock = tcp_read_sock,
1091 .read_skb = tcp_read_skb,
1092 .sendmsg_locked = tcp_sendmsg_locked,
1093 .peek_len = tcp_peek_len,
1094 #ifdef CONFIG_COMPAT
1095 .compat_ioctl = inet_compat_ioctl,
1096 #endif
1097 .set_rcvlowat = tcp_set_rcvlowat,
1098 };
1099 EXPORT_SYMBOL(inet_stream_ops);
1100
1101 const struct proto_ops inet_dgram_ops = {
1102 .family = PF_INET,
1103 .owner = THIS_MODULE,
1104 .release = inet_release,
1105 .bind = inet_bind,
1106 .connect = inet_dgram_connect,
1107 .socketpair = sock_no_socketpair,
1108 .accept = sock_no_accept,
1109 .getname = inet_getname,
1110 .poll = udp_poll,
1111 .ioctl = inet_ioctl,
1112 .gettstamp = sock_gettstamp,
1113 .listen = sock_no_listen,
1114 .shutdown = inet_shutdown,
1115 .setsockopt = sock_common_setsockopt,
1116 .getsockopt = sock_common_getsockopt,
1117 .sendmsg = inet_sendmsg,
1118 .read_skb = udp_read_skb,
1119 .recvmsg = inet_recvmsg,
1120 .mmap = sock_no_mmap,
1121 .splice_eof = inet_splice_eof,
1122 .set_peek_off = udp_set_peek_off,
1123 #ifdef CONFIG_COMPAT
1124 .compat_ioctl = inet_compat_ioctl,
1125 #endif
1126 };
1127 EXPORT_SYMBOL(inet_dgram_ops);
1128
1129 /*
1130 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1131 * udp_poll
1132 */
1133 static const struct proto_ops inet_sockraw_ops = {
1134 .family = PF_INET,
1135 .owner = THIS_MODULE,
1136 .release = inet_release,
1137 .bind = inet_bind,
1138 .connect = inet_dgram_connect,
1139 .socketpair = sock_no_socketpair,
1140 .accept = sock_no_accept,
1141 .getname = inet_getname,
1142 .poll = datagram_poll,
1143 .ioctl = inet_ioctl,
1144 .gettstamp = sock_gettstamp,
1145 .listen = sock_no_listen,
1146 .shutdown = inet_shutdown,
1147 .setsockopt = sock_common_setsockopt,
1148 .getsockopt = sock_common_getsockopt,
1149 .sendmsg = inet_sendmsg,
1150 .recvmsg = inet_recvmsg,
1151 .mmap = sock_no_mmap,
1152 .splice_eof = inet_splice_eof,
1153 #ifdef CONFIG_COMPAT
1154 .compat_ioctl = inet_compat_ioctl,
1155 #endif
1156 };
1157
1158 static const struct net_proto_family inet_family_ops = {
1159 .family = PF_INET,
1160 .create = inet_create,
1161 .owner = THIS_MODULE,
1162 };
1163
1164 /* Upon startup we insert all the elements in inetsw_array[] into
1165 * the linked list inetsw.
1166 */
1167 static struct inet_protosw inetsw_array[] =
1168 {
1169 {
1170 .type = SOCK_STREAM,
1171 .protocol = IPPROTO_TCP,
1172 .prot = &tcp_prot,
1173 .ops = &inet_stream_ops,
1174 .flags = INET_PROTOSW_PERMANENT |
1175 INET_PROTOSW_ICSK,
1176 },
1177
1178 {
1179 .type = SOCK_DGRAM,
1180 .protocol = IPPROTO_UDP,
1181 .prot = &udp_prot,
1182 .ops = &inet_dgram_ops,
1183 .flags = INET_PROTOSW_PERMANENT,
1184 },
1185
1186 {
1187 .type = SOCK_DGRAM,
1188 .protocol = IPPROTO_ICMP,
1189 .prot = &ping_prot,
1190 .ops = &inet_sockraw_ops,
1191 .flags = INET_PROTOSW_REUSE,
1192 },
1193
1194 {
1195 .type = SOCK_RAW,
1196 .protocol = IPPROTO_IP, /* wild card */
1197 .prot = &raw_prot,
1198 .ops = &inet_sockraw_ops,
1199 .flags = INET_PROTOSW_REUSE,
1200 }
1201 };
1202
1203 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1204
inet_register_protosw(struct inet_protosw * p)1205 void inet_register_protosw(struct inet_protosw *p)
1206 {
1207 struct list_head *lh;
1208 struct inet_protosw *answer;
1209 int protocol = p->protocol;
1210 struct list_head *last_perm;
1211
1212 spin_lock_bh(&inetsw_lock);
1213
1214 if (p->type >= SOCK_MAX)
1215 goto out_illegal;
1216
1217 /* If we are trying to override a permanent protocol, bail. */
1218 last_perm = &inetsw[p->type];
1219 list_for_each(lh, &inetsw[p->type]) {
1220 answer = list_entry(lh, struct inet_protosw, list);
1221 /* Check only the non-wild match. */
1222 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1223 break;
1224 if (protocol == answer->protocol)
1225 goto out_permanent;
1226 last_perm = lh;
1227 }
1228
1229 /* Add the new entry after the last permanent entry if any, so that
1230 * the new entry does not override a permanent entry when matched with
1231 * a wild-card protocol. But it is allowed to override any existing
1232 * non-permanent entry. This means that when we remove this entry, the
1233 * system automatically returns to the old behavior.
1234 */
1235 list_add_rcu(&p->list, last_perm);
1236 out:
1237 spin_unlock_bh(&inetsw_lock);
1238
1239 return;
1240
1241 out_permanent:
1242 pr_err("Attempt to override permanent protocol %d\n", protocol);
1243 goto out;
1244
1245 out_illegal:
1246 pr_err("Ignoring attempt to register invalid socket type %d\n",
1247 p->type);
1248 goto out;
1249 }
1250 EXPORT_SYMBOL(inet_register_protosw);
1251
inet_unregister_protosw(struct inet_protosw * p)1252 void inet_unregister_protosw(struct inet_protosw *p)
1253 {
1254 if (INET_PROTOSW_PERMANENT & p->flags) {
1255 pr_err("Attempt to unregister permanent protocol %d\n",
1256 p->protocol);
1257 } else {
1258 spin_lock_bh(&inetsw_lock);
1259 list_del_rcu(&p->list);
1260 spin_unlock_bh(&inetsw_lock);
1261
1262 synchronize_net();
1263 }
1264 }
1265 EXPORT_SYMBOL(inet_unregister_protosw);
1266
inet_sk_reselect_saddr(struct sock * sk)1267 static int inet_sk_reselect_saddr(struct sock *sk)
1268 {
1269 struct inet_sock *inet = inet_sk(sk);
1270 __be32 old_saddr = inet->inet_saddr;
1271 __be32 daddr = inet->inet_daddr;
1272 struct flowi4 *fl4;
1273 struct rtable *rt;
1274 __be32 new_saddr;
1275 struct ip_options_rcu *inet_opt;
1276 int err;
1277
1278 inet_opt = rcu_dereference_protected(inet->inet_opt,
1279 lockdep_sock_is_held(sk));
1280 if (inet_opt && inet_opt->opt.srr)
1281 daddr = inet_opt->opt.faddr;
1282
1283 /* Query new route. */
1284 fl4 = &inet->cork.fl.u.ip4;
1285 rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if,
1286 sk->sk_protocol, inet->inet_sport,
1287 inet->inet_dport, sk);
1288 if (IS_ERR(rt))
1289 return PTR_ERR(rt);
1290
1291 new_saddr = fl4->saddr;
1292
1293 if (new_saddr == old_saddr) {
1294 sk_setup_caps(sk, &rt->dst);
1295 return 0;
1296 }
1297
1298 err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET);
1299 if (err) {
1300 ip_rt_put(rt);
1301 return err;
1302 }
1303
1304 sk_setup_caps(sk, &rt->dst);
1305
1306 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1307 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1308 __func__, &old_saddr, &new_saddr);
1309 }
1310
1311 /*
1312 * XXX The only one ugly spot where we need to
1313 * XXX really change the sockets identity after
1314 * XXX it has entered the hashes. -DaveM
1315 *
1316 * Besides that, it does not check for connection
1317 * uniqueness. Wait for troubles.
1318 */
1319 return __sk_prot_rehash(sk);
1320 }
1321
inet_sk_rebuild_header(struct sock * sk)1322 int inet_sk_rebuild_header(struct sock *sk)
1323 {
1324 struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0));
1325 struct inet_sock *inet = inet_sk(sk);
1326 struct flowi4 *fl4;
1327 int err;
1328
1329 /* Route is OK, nothing to do. */
1330 if (rt)
1331 return 0;
1332
1333 /* Reroute. */
1334 fl4 = &inet->cork.fl.u.ip4;
1335 inet_sk_init_flowi4(inet, fl4);
1336 rt = ip_route_output_flow(sock_net(sk), fl4, sk);
1337 if (!IS_ERR(rt)) {
1338 err = 0;
1339 sk_setup_caps(sk, &rt->dst);
1340 } else {
1341 err = PTR_ERR(rt);
1342
1343 /* Routing failed... */
1344 sk->sk_route_caps = 0;
1345
1346 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1347 sk->sk_state != TCP_SYN_SENT ||
1348 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1349 (err = inet_sk_reselect_saddr(sk)) != 0)
1350 WRITE_ONCE(sk->sk_err_soft, -err);
1351 }
1352
1353 return err;
1354 }
1355 EXPORT_SYMBOL(inet_sk_rebuild_header);
1356
inet_sk_set_state(struct sock * sk,int state)1357 void inet_sk_set_state(struct sock *sk, int state)
1358 {
1359 trace_inet_sock_set_state(sk, sk->sk_state, state);
1360 sk->sk_state = state;
1361 }
1362 EXPORT_SYMBOL(inet_sk_set_state);
1363
inet_sk_state_store(struct sock * sk,int newstate)1364 void inet_sk_state_store(struct sock *sk, int newstate)
1365 {
1366 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1367 smp_store_release(&sk->sk_state, newstate);
1368 }
1369
inet_gso_segment(struct sk_buff * skb,netdev_features_t features)1370 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1371 netdev_features_t features)
1372 {
1373 bool udpfrag = false, fixedid = false, gso_partial, encap;
1374 struct sk_buff *segs = ERR_PTR(-EINVAL);
1375 const struct net_offload *ops;
1376 unsigned int offset = 0;
1377 struct iphdr *iph;
1378 int proto, tot_len;
1379 int nhoff;
1380 int ihl;
1381 int id;
1382
1383 skb_reset_network_header(skb);
1384 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1385 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1386 goto out;
1387
1388 iph = ip_hdr(skb);
1389 ihl = iph->ihl * 4;
1390 if (ihl < sizeof(*iph))
1391 goto out;
1392
1393 id = ntohs(iph->id);
1394 proto = iph->protocol;
1395
1396 /* Warning: after this point, iph might be no longer valid */
1397 if (unlikely(!pskb_may_pull(skb, ihl)))
1398 goto out;
1399 __skb_pull(skb, ihl);
1400
1401 encap = SKB_GSO_CB(skb)->encap_level > 0;
1402 if (encap)
1403 features &= skb->dev->hw_enc_features;
1404 SKB_GSO_CB(skb)->encap_level += ihl;
1405
1406 skb_reset_transport_header(skb);
1407
1408 segs = ERR_PTR(-EPROTONOSUPPORT);
1409
1410 fixedid = !!(skb_shinfo(skb)->gso_type & (SKB_GSO_TCP_FIXEDID << encap));
1411
1412 if (!skb->encapsulation || encap)
1413 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1414
1415 ops = rcu_dereference(inet_offloads[proto]);
1416 if (likely(ops && ops->callbacks.gso_segment)) {
1417 segs = ops->callbacks.gso_segment(skb, features);
1418 if (!segs)
1419 skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1420 }
1421
1422 if (IS_ERR_OR_NULL(segs))
1423 goto out;
1424
1425 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1426
1427 skb = segs;
1428 do {
1429 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1430 if (udpfrag) {
1431 iph->frag_off = htons(offset >> 3);
1432 if (skb->next)
1433 iph->frag_off |= htons(IP_MF);
1434 offset += skb->len - nhoff - ihl;
1435 tot_len = skb->len - nhoff;
1436 } else if (skb_is_gso(skb)) {
1437 if (!fixedid) {
1438 iph->id = htons(id);
1439 id += skb_shinfo(skb)->gso_segs;
1440 }
1441
1442 if (gso_partial)
1443 tot_len = skb_shinfo(skb)->gso_size +
1444 SKB_GSO_CB(skb)->data_offset +
1445 skb->head - (unsigned char *)iph;
1446 else
1447 tot_len = skb->len - nhoff;
1448 } else {
1449 if (!fixedid)
1450 iph->id = htons(id++);
1451 tot_len = skb->len - nhoff;
1452 }
1453 iph->tot_len = htons(tot_len);
1454 ip_send_check(iph);
1455 if (encap)
1456 skb_reset_inner_headers(skb);
1457 skb->network_header = (u8 *)iph - skb->head;
1458 skb_reset_mac_len(skb);
1459 } while ((skb = skb->next));
1460
1461 out:
1462 return segs;
1463 }
1464
ipip_gso_segment(struct sk_buff * skb,netdev_features_t features)1465 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1466 netdev_features_t features)
1467 {
1468 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1469 return ERR_PTR(-EINVAL);
1470
1471 return inet_gso_segment(skb, features);
1472 }
1473
inet_gro_receive(struct list_head * head,struct sk_buff * skb)1474 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1475 {
1476 const struct net_offload *ops;
1477 struct sk_buff *pp = NULL;
1478 const struct iphdr *iph;
1479 struct sk_buff *p;
1480 unsigned int hlen;
1481 unsigned int off;
1482 int flush = 1;
1483 int proto;
1484
1485 off = skb_gro_offset(skb);
1486 hlen = off + sizeof(*iph);
1487 iph = skb_gro_header(skb, hlen, off);
1488 if (unlikely(!iph))
1489 goto out;
1490
1491 proto = iph->protocol;
1492
1493 ops = rcu_dereference(inet_offloads[proto]);
1494 if (!ops || !ops->callbacks.gro_receive)
1495 goto out;
1496
1497 if (*(u8 *)iph != 0x45)
1498 goto out;
1499
1500 if (ip_is_fragment(iph))
1501 goto out;
1502
1503 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1504 goto out;
1505
1506 NAPI_GRO_CB(skb)->proto = proto;
1507 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (ntohl(*(__be32 *)&iph->id) & ~IP_DF));
1508
1509 list_for_each_entry(p, head, list) {
1510 struct iphdr *iph2;
1511
1512 if (!NAPI_GRO_CB(p)->same_flow)
1513 continue;
1514
1515 iph2 = (struct iphdr *)(p->data + off);
1516 /* The above works because, with the exception of the top
1517 * (inner most) layer, we only aggregate pkts with the same
1518 * hdr length so all the hdrs we'll need to verify will start
1519 * at the same offset.
1520 */
1521 if ((iph->protocol ^ iph2->protocol) |
1522 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1523 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1524 NAPI_GRO_CB(p)->same_flow = 0;
1525 continue;
1526 }
1527 }
1528
1529 NAPI_GRO_CB(skb)->flush |= flush;
1530 NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = off;
1531
1532 /* Note : No need to call skb_gro_postpull_rcsum() here,
1533 * as we already checked checksum over ipv4 header was 0
1534 */
1535 skb_gro_pull(skb, sizeof(*iph));
1536 skb_set_transport_header(skb, skb_gro_offset(skb));
1537
1538 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1539 ops->callbacks.gro_receive, head, skb);
1540
1541 out:
1542 skb_gro_flush_final(skb, pp, flush);
1543
1544 return pp;
1545 }
1546
ipip_gro_receive(struct list_head * head,struct sk_buff * skb)1547 static struct sk_buff *ipip_gro_receive(struct list_head *head,
1548 struct sk_buff *skb)
1549 {
1550 if (NAPI_GRO_CB(skb)->encap_mark) {
1551 NAPI_GRO_CB(skb)->flush = 1;
1552 return NULL;
1553 }
1554
1555 NAPI_GRO_CB(skb)->encap_mark = 1;
1556
1557 return inet_gro_receive(head, skb);
1558 }
1559
1560 #define SECONDS_PER_DAY 86400
1561
1562 /* inet_current_timestamp - Return IP network timestamp
1563 *
1564 * Return milliseconds since midnight in network byte order.
1565 */
inet_current_timestamp(void)1566 __be32 inet_current_timestamp(void)
1567 {
1568 u32 secs;
1569 u32 msecs;
1570 struct timespec64 ts;
1571
1572 ktime_get_real_ts64(&ts);
1573
1574 /* Get secs since midnight. */
1575 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1576 /* Convert to msecs. */
1577 msecs = secs * MSEC_PER_SEC;
1578 /* Convert nsec to msec. */
1579 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1580
1581 /* Convert to network byte order. */
1582 return htonl(msecs);
1583 }
1584 EXPORT_SYMBOL(inet_current_timestamp);
1585
inet_recv_error(struct sock * sk,struct msghdr * msg,int len,int * addr_len)1586 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1587 {
1588 unsigned int family = READ_ONCE(sk->sk_family);
1589
1590 if (family == AF_INET)
1591 return ip_recv_error(sk, msg, len, addr_len);
1592 #if IS_ENABLED(CONFIG_IPV6)
1593 if (family == AF_INET6)
1594 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1595 #endif
1596 return -EINVAL;
1597 }
1598 EXPORT_SYMBOL(inet_recv_error);
1599
inet_gro_complete(struct sk_buff * skb,int nhoff)1600 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1601 {
1602 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1603 const struct net_offload *ops;
1604 __be16 totlen = iph->tot_len;
1605 int proto = iph->protocol;
1606 int err = -ENOSYS;
1607
1608 if (skb->encapsulation) {
1609 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1610 skb_set_inner_network_header(skb, nhoff);
1611 }
1612
1613 iph_set_totlen(iph, skb->len - nhoff);
1614 csum_replace2(&iph->check, totlen, iph->tot_len);
1615
1616 ops = rcu_dereference(inet_offloads[proto]);
1617 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1618 goto out;
1619
1620 /* Only need to add sizeof(*iph) to get to the next hdr below
1621 * because any hdr with option will have been flushed in
1622 * inet_gro_receive().
1623 */
1624 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1625 tcp4_gro_complete, udp4_gro_complete,
1626 skb, nhoff + sizeof(*iph));
1627
1628 out:
1629 return err;
1630 }
1631
ipip_gro_complete(struct sk_buff * skb,int nhoff)1632 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1633 {
1634 skb->encapsulation = 1;
1635 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1636 return inet_gro_complete(skb, nhoff);
1637 }
1638
inet_ctl_sock_create(struct sock ** sk,unsigned short family,unsigned short type,unsigned char protocol,struct net * net)1639 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1640 unsigned short type, unsigned char protocol,
1641 struct net *net)
1642 {
1643 struct socket *sock;
1644 int rc = sock_create_kern(net, family, type, protocol, &sock);
1645
1646 if (rc == 0) {
1647 *sk = sock->sk;
1648 (*sk)->sk_allocation = GFP_ATOMIC;
1649 (*sk)->sk_use_task_frag = false;
1650 /*
1651 * Unhash it so that IP input processing does not even see it,
1652 * we do not wish this socket to see incoming packets.
1653 */
1654 (*sk)->sk_prot->unhash(*sk);
1655 }
1656 return rc;
1657 }
1658 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1659
snmp_fold_field(void __percpu * mib,int offt)1660 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1661 {
1662 unsigned long res = 0;
1663 int i;
1664
1665 for_each_possible_cpu(i)
1666 res += snmp_get_cpu_field(mib, i, offt);
1667 return res;
1668 }
1669 EXPORT_SYMBOL_GPL(snmp_fold_field);
1670
1671 #if BITS_PER_LONG==32
1672
snmp_get_cpu_field64(void __percpu * mib,int cpu,int offt,size_t syncp_offset)1673 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1674 size_t syncp_offset)
1675 {
1676 void *bhptr;
1677 struct u64_stats_sync *syncp;
1678 u64 v;
1679 unsigned int start;
1680
1681 bhptr = per_cpu_ptr(mib, cpu);
1682 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1683 do {
1684 start = u64_stats_fetch_begin(syncp);
1685 v = *(((u64 *)bhptr) + offt);
1686 } while (u64_stats_fetch_retry(syncp, start));
1687
1688 return v;
1689 }
1690 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1691
snmp_fold_field64(void __percpu * mib,int offt,size_t syncp_offset)1692 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1693 {
1694 u64 res = 0;
1695 int cpu;
1696
1697 for_each_possible_cpu(cpu) {
1698 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1699 }
1700 return res;
1701 }
1702 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1703 #endif
1704
1705 #ifdef CONFIG_IP_MULTICAST
1706 static const struct net_protocol igmp_protocol = {
1707 .handler = igmp_rcv,
1708 };
1709 #endif
1710
1711 static const struct net_protocol icmp_protocol = {
1712 .handler = icmp_rcv,
1713 .err_handler = icmp_err,
1714 .no_policy = 1,
1715 };
1716
ipv4_mib_init_net(struct net * net)1717 static __net_init int ipv4_mib_init_net(struct net *net)
1718 {
1719 int i;
1720
1721 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1722 if (!net->mib.tcp_statistics)
1723 goto err_tcp_mib;
1724 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1725 if (!net->mib.ip_statistics)
1726 goto err_ip_mib;
1727
1728 for_each_possible_cpu(i) {
1729 struct ipstats_mib *af_inet_stats;
1730 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1731 u64_stats_init(&af_inet_stats->syncp);
1732 }
1733
1734 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1735 if (!net->mib.net_statistics)
1736 goto err_net_mib;
1737 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1738 if (!net->mib.udp_statistics)
1739 goto err_udp_mib;
1740 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1741 if (!net->mib.udplite_statistics)
1742 goto err_udplite_mib;
1743 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1744 if (!net->mib.icmp_statistics)
1745 goto err_icmp_mib;
1746 net->mib.icmpmsg_statistics = kzalloc_obj(struct icmpmsg_mib);
1747 if (!net->mib.icmpmsg_statistics)
1748 goto err_icmpmsg_mib;
1749
1750 tcp_mib_init(net);
1751 return 0;
1752
1753 err_icmpmsg_mib:
1754 free_percpu(net->mib.icmp_statistics);
1755 err_icmp_mib:
1756 free_percpu(net->mib.udplite_statistics);
1757 err_udplite_mib:
1758 free_percpu(net->mib.udp_statistics);
1759 err_udp_mib:
1760 free_percpu(net->mib.net_statistics);
1761 err_net_mib:
1762 free_percpu(net->mib.ip_statistics);
1763 err_ip_mib:
1764 free_percpu(net->mib.tcp_statistics);
1765 err_tcp_mib:
1766 return -ENOMEM;
1767 }
1768
ipv4_mib_exit_net(struct net * net)1769 static __net_exit void ipv4_mib_exit_net(struct net *net)
1770 {
1771 kfree(net->mib.icmpmsg_statistics);
1772 free_percpu(net->mib.icmp_statistics);
1773 free_percpu(net->mib.udplite_statistics);
1774 free_percpu(net->mib.udp_statistics);
1775 free_percpu(net->mib.net_statistics);
1776 free_percpu(net->mib.ip_statistics);
1777 free_percpu(net->mib.tcp_statistics);
1778 #ifdef CONFIG_MPTCP
1779 /* allocated on demand, see mptcp_init_sock() */
1780 free_percpu(net->mib.mptcp_statistics);
1781 #endif
1782 }
1783
1784 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1785 .init = ipv4_mib_init_net,
1786 .exit = ipv4_mib_exit_net,
1787 };
1788
init_ipv4_mibs(void)1789 static int __init init_ipv4_mibs(void)
1790 {
1791 return register_pernet_subsys(&ipv4_mib_ops);
1792 }
1793
inet_init_net(struct net * net)1794 static __net_init int inet_init_net(struct net *net)
1795 {
1796 /*
1797 * Set defaults for local port range
1798 */
1799 net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u;
1800
1801 seqlock_init(&net->ipv4.ping_group_range.lock);
1802 /*
1803 * Sane defaults - nobody may create ping sockets.
1804 * Boot scripts should set this to distro-specific group.
1805 */
1806 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1807 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1808
1809 /* Default values for sysctl-controlled parameters.
1810 * We set them here, in case sysctl is not compiled.
1811 */
1812 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1813 net->ipv4.sysctl_ip_fwd_update_priority = 1;
1814 net->ipv4.sysctl_ip_dynaddr = 0;
1815 net->ipv4.sysctl_ip_early_demux = 1;
1816 net->ipv4.sysctl_udp_early_demux = 1;
1817 net->ipv4.sysctl_tcp_early_demux = 1;
1818 net->ipv4.sysctl_nexthop_compat_mode = 1;
1819 #ifdef CONFIG_SYSCTL
1820 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1821 #endif
1822
1823 /* Some igmp sysctl, whose values are always used */
1824 net->ipv4.sysctl_igmp_max_memberships = 20;
1825 net->ipv4.sysctl_igmp_max_msf = 10;
1826 /* IGMP reports for link-local multicast groups are enabled by default */
1827 net->ipv4.sysctl_igmp_llm_reports = 1;
1828 net->ipv4.sysctl_igmp_qrv = 2;
1829
1830 net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1831
1832 return 0;
1833 }
1834
1835 static __net_initdata struct pernet_operations af_inet_ops = {
1836 .init = inet_init_net,
1837 };
1838
init_inet_pernet_ops(void)1839 static int __init init_inet_pernet_ops(void)
1840 {
1841 return register_pernet_subsys(&af_inet_ops);
1842 }
1843
1844 static int ipv4_proc_init(void);
1845
1846 /*
1847 * IP protocol layer initialiser
1848 */
1849
1850
1851 static const struct net_offload ipip_offload = {
1852 .callbacks = {
1853 .gso_segment = ipip_gso_segment,
1854 .gro_receive = ipip_gro_receive,
1855 .gro_complete = ipip_gro_complete,
1856 },
1857 };
1858
ipip_offload_init(void)1859 static int __init ipip_offload_init(void)
1860 {
1861 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1862 }
1863
ipv4_offload_init(void)1864 static int __init ipv4_offload_init(void)
1865 {
1866 /*
1867 * Add offloads
1868 */
1869 if (udpv4_offload_init() < 0)
1870 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1871 if (tcpv4_offload_init() < 0)
1872 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1873 if (ipip_offload_init() < 0)
1874 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1875
1876 net_hotdata.ip_packet_offload = (struct packet_offload) {
1877 .type = cpu_to_be16(ETH_P_IP),
1878 .callbacks = {
1879 .gso_segment = inet_gso_segment,
1880 .gro_receive = inet_gro_receive,
1881 .gro_complete = inet_gro_complete,
1882 },
1883 };
1884 dev_add_offload(&net_hotdata.ip_packet_offload);
1885 return 0;
1886 }
1887
1888 fs_initcall(ipv4_offload_init);
1889
1890 static struct packet_type ip_packet_type __read_mostly = {
1891 .type = cpu_to_be16(ETH_P_IP),
1892 .func = ip_rcv,
1893 .list_func = ip_list_rcv,
1894 };
1895
inet_init(void)1896 static int __init inet_init(void)
1897 {
1898 struct inet_protosw *q;
1899 struct list_head *r;
1900 int rc;
1901
1902 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1903
1904 raw_hashinfo_init(&raw_v4_hashinfo);
1905
1906 rc = proto_register(&tcp_prot, 1);
1907 if (rc)
1908 goto out;
1909
1910 rc = proto_register(&udp_prot, 1);
1911 if (rc)
1912 goto out_unregister_tcp_proto;
1913
1914 rc = proto_register(&raw_prot, 1);
1915 if (rc)
1916 goto out_unregister_udp_proto;
1917
1918 rc = proto_register(&ping_prot, 1);
1919 if (rc)
1920 goto out_unregister_raw_proto;
1921
1922 /*
1923 * Tell SOCKET that we are alive...
1924 */
1925
1926 (void)sock_register(&inet_family_ops);
1927
1928 #ifdef CONFIG_SYSCTL
1929 ip_static_sysctl_init();
1930 #endif
1931
1932 /*
1933 * Add all the base protocols.
1934 */
1935
1936 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1937 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1938
1939 net_hotdata.udp_protocol = (struct net_protocol) {
1940 .handler = udp_rcv,
1941 .err_handler = udp_err,
1942 .no_policy = 1,
1943 };
1944 if (inet_add_protocol(&net_hotdata.udp_protocol, IPPROTO_UDP) < 0)
1945 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1946
1947 net_hotdata.tcp_protocol = (struct net_protocol) {
1948 .handler = tcp_v4_rcv,
1949 .err_handler = tcp_v4_err,
1950 .no_policy = 1,
1951 .icmp_strict_tag_validation = 1,
1952 };
1953 if (inet_add_protocol(&net_hotdata.tcp_protocol, IPPROTO_TCP) < 0)
1954 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1955 #ifdef CONFIG_IP_MULTICAST
1956 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1957 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1958 #endif
1959
1960 /* Register the socket-side information for inet_create. */
1961 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1962 INIT_LIST_HEAD(r);
1963
1964 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1965 inet_register_protosw(q);
1966
1967 /*
1968 * Set the ARP module up
1969 */
1970
1971 arp_init();
1972
1973 /*
1974 * Set the IP module up
1975 */
1976
1977 ip_init();
1978
1979 /* Initialise per-cpu ipv4 mibs */
1980 if (init_ipv4_mibs())
1981 panic("%s: Cannot init ipv4 mibs\n", __func__);
1982
1983 /* Setup TCP slab cache for open requests. */
1984 tcp_init();
1985
1986 /* Setup UDP memory threshold */
1987 udp_init();
1988
1989 /* Add UDP-Lite (RFC 3828) */
1990 udplite4_register();
1991
1992 raw_init();
1993
1994 ping_init();
1995
1996 /*
1997 * Set the ICMP layer up
1998 */
1999
2000 if (icmp_init() < 0)
2001 panic("Failed to create the ICMP control socket.\n");
2002
2003 /*
2004 * Initialise the multicast router
2005 */
2006 #if defined(CONFIG_IP_MROUTE)
2007 if (ip_mr_init())
2008 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2009 #endif
2010
2011 if (init_inet_pernet_ops())
2012 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2013
2014 ipv4_proc_init();
2015
2016 ipfrag_init();
2017
2018 dev_add_pack(&ip_packet_type);
2019
2020 ip_tunnel_core_init();
2021
2022 rc = 0;
2023 out:
2024 return rc;
2025 out_unregister_raw_proto:
2026 proto_unregister(&raw_prot);
2027 out_unregister_udp_proto:
2028 proto_unregister(&udp_prot);
2029 out_unregister_tcp_proto:
2030 proto_unregister(&tcp_prot);
2031 goto out;
2032 }
2033
2034 fs_initcall(inet_init);
2035
2036 /* ------------------------------------------------------------------------ */
2037
2038 #ifdef CONFIG_PROC_FS
ipv4_proc_init(void)2039 static int __init ipv4_proc_init(void)
2040 {
2041 int rc = 0;
2042
2043 if (raw_proc_init())
2044 goto out_raw;
2045 if (tcp4_proc_init())
2046 goto out_tcp;
2047 if (udp4_proc_init())
2048 goto out_udp;
2049 if (ping_proc_init())
2050 goto out_ping;
2051 if (ip_misc_proc_init())
2052 goto out_misc;
2053 out:
2054 return rc;
2055 out_misc:
2056 ping_proc_exit();
2057 out_ping:
2058 udp4_proc_exit();
2059 out_udp:
2060 tcp4_proc_exit();
2061 out_tcp:
2062 raw_proc_exit();
2063 out_raw:
2064 rc = -ENOMEM;
2065 goto out;
2066 }
2067
2068 #else /* CONFIG_PROC_FS */
ipv4_proc_init(void)2069 static int __init ipv4_proc_init(void)
2070 {
2071 return 0;
2072 }
2073 #endif /* CONFIG_PROC_FS */
2074