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