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/tcp.h>
104 #include <net/udp.h>
105 #include <net/udplite.h>
106 #include <net/ping.h>
107 #include <linux/skbuff.h>
108 #include <net/sock.h>
109 #include <net/raw.h>
110 #include <net/icmp.h>
111 #include <net/inet_common.h>
112 #include <net/ip_tunnels.h>
113 #include <net/xfrm.h>
114 #include <net/net_namespace.h>
115 #include <net/secure_seq.h>
116 #ifdef CONFIG_IP_MROUTE
117 #include <linux/mroute.h>
118 #endif
119 #include <net/l3mdev.h>
120 #include <net/compat.h>
121
122 #include <trace/events/sock.h>
123
124 /* The inetsw table contains everything that inet_create needs to
125 * build a new socket.
126 */
127 static struct list_head inetsw[SOCK_MAX];
128 static DEFINE_SPINLOCK(inetsw_lock);
129
130 /* New destruction routine */
131
inet_sock_destruct(struct sock * sk)132 void inet_sock_destruct(struct sock *sk)
133 {
134 struct inet_sock *inet = inet_sk(sk);
135
136 __skb_queue_purge(&sk->sk_receive_queue);
137 __skb_queue_purge(&sk->sk_error_queue);
138
139 sk_mem_reclaim_final(sk);
140
141 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
142 pr_err("Attempt to release TCP socket in state %d %p\n",
143 sk->sk_state, sk);
144 return;
145 }
146 if (!sock_flag(sk, SOCK_DEAD)) {
147 pr_err("Attempt to release alive inet socket %p\n", sk);
148 return;
149 }
150
151 WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc));
152 WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc));
153 WARN_ON_ONCE(sk->sk_wmem_queued);
154 WARN_ON_ONCE(sk_forward_alloc_get(sk));
155
156 kfree(rcu_dereference_protected(inet->inet_opt, 1));
157 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
158 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1));
159 sk_refcnt_debug_dec(sk);
160 }
161 EXPORT_SYMBOL(inet_sock_destruct);
162
163 /*
164 * The routines beyond this point handle the behaviour of an AF_INET
165 * socket object. Mostly it punts to the subprotocols of IP to do
166 * the work.
167 */
168
169 /*
170 * Automatically bind an unbound socket.
171 */
172
inet_autobind(struct sock * sk)173 static int inet_autobind(struct sock *sk)
174 {
175 struct inet_sock *inet;
176 /* We may need to bind the socket. */
177 lock_sock(sk);
178 inet = inet_sk(sk);
179 if (!inet->inet_num) {
180 if (sk->sk_prot->get_port(sk, 0)) {
181 release_sock(sk);
182 return -EAGAIN;
183 }
184 inet->inet_sport = htons(inet->inet_num);
185 }
186 release_sock(sk);
187 return 0;
188 }
189
190 /*
191 * Move a socket into listening state.
192 */
inet_listen(struct socket * sock,int backlog)193 int inet_listen(struct socket *sock, int backlog)
194 {
195 struct sock *sk = sock->sk;
196 unsigned char old_state;
197 int err, tcp_fastopen;
198
199 lock_sock(sk);
200
201 err = -EINVAL;
202 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
203 goto out;
204
205 old_state = sk->sk_state;
206 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
207 goto out;
208
209 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
210 /* Really, if the socket is already in listen state
211 * we can only allow the backlog to be adjusted.
212 */
213 if (old_state != TCP_LISTEN) {
214 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
215 * Note that only TCP sockets (SOCK_STREAM) will reach here.
216 * Also fastopen backlog may already been set via the option
217 * because the socket was in TCP_LISTEN state previously but
218 * was shutdown() rather than close().
219 */
220 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen);
221 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
222 (tcp_fastopen & TFO_SERVER_ENABLE) &&
223 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
224 fastopen_queue_tune(sk, backlog);
225 tcp_fastopen_init_key_once(sock_net(sk));
226 }
227
228 err = inet_csk_listen_start(sk);
229 if (err)
230 goto out;
231 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
232 }
233 err = 0;
234
235 out:
236 release_sock(sk);
237 return err;
238 }
239 EXPORT_SYMBOL(inet_listen);
240
241 /*
242 * Create an inet socket.
243 */
244
inet_create(struct net * net,struct socket * sock,int protocol,int kern)245 static int inet_create(struct net *net, struct socket *sock, int protocol,
246 int kern)
247 {
248 struct sock *sk;
249 struct inet_protosw *answer;
250 struct inet_sock *inet;
251 struct proto *answer_prot;
252 unsigned char answer_flags;
253 int try_loading_module = 0;
254 int err;
255
256 if (protocol < 0 || protocol >= IPPROTO_MAX)
257 return -EINVAL;
258
259 sock->state = SS_UNCONNECTED;
260
261 /* Look for the requested type/protocol pair. */
262 lookup_protocol:
263 err = -ESOCKTNOSUPPORT;
264 rcu_read_lock();
265 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
266
267 err = 0;
268 /* Check the non-wild match. */
269 if (protocol == answer->protocol) {
270 if (protocol != IPPROTO_IP)
271 break;
272 } else {
273 /* Check for the two wild cases. */
274 if (IPPROTO_IP == protocol) {
275 protocol = answer->protocol;
276 break;
277 }
278 if (IPPROTO_IP == answer->protocol)
279 break;
280 }
281 err = -EPROTONOSUPPORT;
282 }
283
284 if (unlikely(err)) {
285 if (try_loading_module < 2) {
286 rcu_read_unlock();
287 /*
288 * Be more specific, e.g. net-pf-2-proto-132-type-1
289 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
290 */
291 if (++try_loading_module == 1)
292 request_module("net-pf-%d-proto-%d-type-%d",
293 PF_INET, protocol, sock->type);
294 /*
295 * Fall back to generic, e.g. net-pf-2-proto-132
296 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
297 */
298 else
299 request_module("net-pf-%d-proto-%d",
300 PF_INET, protocol);
301 goto lookup_protocol;
302 } else
303 goto out_rcu_unlock;
304 }
305
306 err = -EPERM;
307 if (sock->type == SOCK_RAW && !kern &&
308 !ns_capable(net->user_ns, CAP_NET_RAW))
309 goto out_rcu_unlock;
310
311 sock->ops = answer->ops;
312 answer_prot = answer->prot;
313 answer_flags = answer->flags;
314 rcu_read_unlock();
315
316 WARN_ON(!answer_prot->slab);
317
318 err = -ENOMEM;
319 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
320 if (!sk)
321 goto out;
322
323 err = 0;
324 if (INET_PROTOSW_REUSE & answer_flags)
325 sk->sk_reuse = SK_CAN_REUSE;
326
327 if (INET_PROTOSW_ICSK & answer_flags)
328 inet_init_csk_locks(sk);
329
330 inet = inet_sk(sk);
331 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
332
333 inet->nodefrag = 0;
334
335 if (SOCK_RAW == sock->type) {
336 inet->inet_num = protocol;
337 if (IPPROTO_RAW == protocol)
338 inet->hdrincl = 1;
339 }
340
341 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
342 inet->pmtudisc = IP_PMTUDISC_DONT;
343 else
344 inet->pmtudisc = IP_PMTUDISC_WANT;
345
346 inet->inet_id = 0;
347
348 sock_init_data(sock, sk);
349
350 sk->sk_destruct = inet_sock_destruct;
351 sk->sk_protocol = protocol;
352 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
353 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
354
355 inet->uc_ttl = -1;
356 inet->mc_loop = 1;
357 inet->mc_ttl = 1;
358 inet->mc_all = 1;
359 inet->mc_index = 0;
360 inet->mc_list = NULL;
361 inet->rcv_tos = 0;
362
363 sk_refcnt_debug_inc(sk);
364
365 if (inet->inet_num) {
366 /* It assumes that any protocol which allows
367 * the user to assign a number at socket
368 * creation time automatically
369 * shares.
370 */
371 inet->inet_sport = htons(inet->inet_num);
372 /* Add to protocol hash chains. */
373 err = sk->sk_prot->hash(sk);
374 if (err) {
375 sk_common_release(sk);
376 goto out;
377 }
378 }
379
380 if (sk->sk_prot->init) {
381 err = sk->sk_prot->init(sk);
382 if (err) {
383 sk_common_release(sk);
384 goto out;
385 }
386 }
387
388 if (!kern) {
389 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
390 if (err) {
391 sk_common_release(sk);
392 goto out;
393 }
394 }
395 out:
396 return err;
397 out_rcu_unlock:
398 rcu_read_unlock();
399 goto out;
400 }
401
402
403 /*
404 * The peer socket should always be NULL (or else). When we call this
405 * function we are destroying the object and from then on nobody
406 * should refer to it.
407 */
inet_release(struct socket * sock)408 int inet_release(struct socket *sock)
409 {
410 struct sock *sk = sock->sk;
411
412 if (sk) {
413 long timeout;
414
415 if (!sk->sk_kern_sock)
416 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
417
418 /* Applications forget to leave groups before exiting */
419 ip_mc_drop_socket(sk);
420
421 /* If linger is set, we don't return until the close
422 * is complete. Otherwise we return immediately. The
423 * actually closing is done the same either way.
424 *
425 * If the close is due to the process exiting, we never
426 * linger..
427 */
428 timeout = 0;
429 if (sock_flag(sk, SOCK_LINGER) &&
430 !(current->flags & PF_EXITING))
431 timeout = sk->sk_lingertime;
432 sk->sk_prot->close(sk, timeout);
433 sock->sk = NULL;
434 }
435 return 0;
436 }
437 EXPORT_SYMBOL(inet_release);
438
inet_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)439 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
440 {
441 struct sock *sk = sock->sk;
442 u32 flags = BIND_WITH_LOCK;
443 int err;
444
445 /* If the socket has its own bind function then use it. (RAW) */
446 if (sk->sk_prot->bind) {
447 return sk->sk_prot->bind(sk, uaddr, addr_len);
448 }
449 if (addr_len < sizeof(struct sockaddr_in))
450 return -EINVAL;
451
452 /* BPF prog is run before any checks are done so that if the prog
453 * changes context in a wrong way it will be caught.
454 */
455 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
456 CGROUP_INET4_BIND, &flags);
457 if (err)
458 return err;
459
460 return __inet_bind(sk, uaddr, addr_len, flags);
461 }
462 EXPORT_SYMBOL(inet_bind);
463
__inet_bind(struct sock * sk,struct sockaddr * uaddr,int addr_len,u32 flags)464 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
465 u32 flags)
466 {
467 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
468 struct inet_sock *inet = inet_sk(sk);
469 struct net *net = sock_net(sk);
470 unsigned short snum;
471 int chk_addr_ret;
472 u32 tb_id = RT_TABLE_LOCAL;
473 int err;
474
475 if (addr->sin_family != AF_INET) {
476 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
477 * only if s_addr is INADDR_ANY.
478 */
479 err = -EAFNOSUPPORT;
480 if (addr->sin_family != AF_UNSPEC ||
481 addr->sin_addr.s_addr != htonl(INADDR_ANY))
482 goto out;
483 }
484
485 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
486 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
487
488 /* Not specified by any standard per-se, however it breaks too
489 * many applications when removed. It is unfortunate since
490 * allowing applications to make a non-local bind solves
491 * several problems with systems using dynamic addressing.
492 * (ie. your servers still start up even if your ISDN link
493 * is temporarily down)
494 */
495 err = -EADDRNOTAVAIL;
496 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
497 chk_addr_ret))
498 goto out;
499
500 snum = ntohs(addr->sin_port);
501 err = -EACCES;
502 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
503 snum && inet_port_requires_bind_service(net, snum) &&
504 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
505 goto out;
506
507 /* We keep a pair of addresses. rcv_saddr is the one
508 * used by hash lookups, and saddr is used for transmit.
509 *
510 * In the BSD API these are the same except where it
511 * would be illegal to use them (multicast/broadcast) in
512 * which case the sending device address is used.
513 */
514 if (flags & BIND_WITH_LOCK)
515 lock_sock(sk);
516
517 /* Check these errors (active socket, double bind). */
518 err = -EINVAL;
519 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
520 goto out_release_sock;
521
522 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
523 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
524 inet->inet_saddr = 0; /* Use device */
525
526 /* Make sure we are allowed to bind here. */
527 if (snum || !(inet->bind_address_no_port ||
528 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
529 err = sk->sk_prot->get_port(sk, snum);
530 if (err) {
531 inet->inet_saddr = inet->inet_rcv_saddr = 0;
532 goto out_release_sock;
533 }
534 if (!(flags & BIND_FROM_BPF)) {
535 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
536 if (err) {
537 inet->inet_saddr = inet->inet_rcv_saddr = 0;
538 if (sk->sk_prot->put_port)
539 sk->sk_prot->put_port(sk);
540 goto out_release_sock;
541 }
542 }
543 }
544
545 if (inet->inet_rcv_saddr)
546 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
547 if (snum)
548 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
549 inet->inet_sport = htons(inet->inet_num);
550 inet->inet_daddr = 0;
551 inet->inet_dport = 0;
552 sk_dst_reset(sk);
553 err = 0;
554 out_release_sock:
555 if (flags & BIND_WITH_LOCK)
556 release_sock(sk);
557 out:
558 return err;
559 }
560
inet_dgram_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)561 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
562 int addr_len, int flags)
563 {
564 struct sock *sk = sock->sk;
565 const struct proto *prot;
566 int err;
567
568 if (addr_len < sizeof(uaddr->sa_family))
569 return -EINVAL;
570
571 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
572 prot = READ_ONCE(sk->sk_prot);
573
574 if (uaddr->sa_family == AF_UNSPEC)
575 return prot->disconnect(sk, flags);
576
577 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
578 err = prot->pre_connect(sk, uaddr, addr_len);
579 if (err)
580 return err;
581 }
582
583 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
584 return -EAGAIN;
585 return prot->connect(sk, uaddr, addr_len);
586 }
587 EXPORT_SYMBOL(inet_dgram_connect);
588
inet_wait_for_connect(struct sock * sk,long timeo,int writebias)589 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
590 {
591 DEFINE_WAIT_FUNC(wait, woken_wake_function);
592
593 add_wait_queue(sk_sleep(sk), &wait);
594 sk->sk_write_pending += writebias;
595 sk->sk_wait_pending++;
596
597 /* Basic assumption: if someone sets sk->sk_err, he _must_
598 * change state of the socket from TCP_SYN_*.
599 * Connect() does not allow to get error notifications
600 * without closing the socket.
601 */
602 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
603 release_sock(sk);
604 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
605 lock_sock(sk);
606 if (signal_pending(current) || !timeo)
607 break;
608 }
609 remove_wait_queue(sk_sleep(sk), &wait);
610 sk->sk_write_pending -= writebias;
611 sk->sk_wait_pending--;
612 return timeo;
613 }
614
615 /*
616 * Connect to a remote host. There is regrettably still a little
617 * TCP 'magic' in here.
618 */
__inet_stream_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags,int is_sendmsg)619 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
620 int addr_len, int flags, int is_sendmsg)
621 {
622 struct sock *sk = sock->sk;
623 int err;
624 long timeo;
625
626 /*
627 * uaddr can be NULL and addr_len can be 0 if:
628 * sk is a TCP fastopen active socket and
629 * TCP_FASTOPEN_CONNECT sockopt is set and
630 * we already have a valid cookie for this socket.
631 * In this case, user can call write() after connect().
632 * write() will invoke tcp_sendmsg_fastopen() which calls
633 * __inet_stream_connect().
634 */
635 if (uaddr) {
636 if (addr_len < sizeof(uaddr->sa_family))
637 return -EINVAL;
638
639 if (uaddr->sa_family == AF_UNSPEC) {
640 err = sk->sk_prot->disconnect(sk, flags);
641 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
642 goto out;
643 }
644 }
645
646 switch (sock->state) {
647 default:
648 err = -EINVAL;
649 goto out;
650 case SS_CONNECTED:
651 err = -EISCONN;
652 goto out;
653 case SS_CONNECTING:
654 if (inet_sk(sk)->defer_connect)
655 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
656 else
657 err = -EALREADY;
658 /* Fall out of switch with err, set for this state */
659 break;
660 case SS_UNCONNECTED:
661 err = -EISCONN;
662 if (sk->sk_state != TCP_CLOSE)
663 goto out;
664
665 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
666 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
667 if (err)
668 goto out;
669 }
670
671 err = sk->sk_prot->connect(sk, uaddr, addr_len);
672 if (err < 0)
673 goto out;
674
675 sock->state = SS_CONNECTING;
676
677 if (!err && inet_sk(sk)->defer_connect)
678 goto out;
679
680 /* Just entered SS_CONNECTING state; the only
681 * difference is that return value in non-blocking
682 * case is EINPROGRESS, rather than EALREADY.
683 */
684 err = -EINPROGRESS;
685 break;
686 }
687
688 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
689
690 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
691 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
692 tcp_sk(sk)->fastopen_req &&
693 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
694
695 /* Error code is set above */
696 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
697 goto out;
698
699 err = sock_intr_errno(timeo);
700 if (signal_pending(current))
701 goto out;
702 }
703
704 /* Connection was closed by RST, timeout, ICMP error
705 * or another process disconnected us.
706 */
707 if (sk->sk_state == TCP_CLOSE)
708 goto sock_error;
709
710 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
711 * and error was received after socket entered established state.
712 * Hence, it is handled normally after connect() return successfully.
713 */
714
715 sock->state = SS_CONNECTED;
716 err = 0;
717 out:
718 return err;
719
720 sock_error:
721 err = sock_error(sk) ? : -ECONNABORTED;
722 sock->state = SS_UNCONNECTED;
723 if (sk->sk_prot->disconnect(sk, flags))
724 sock->state = SS_DISCONNECTING;
725 goto out;
726 }
727 EXPORT_SYMBOL(__inet_stream_connect);
728
inet_stream_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)729 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
730 int addr_len, int flags)
731 {
732 int err;
733
734 lock_sock(sock->sk);
735 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
736 release_sock(sock->sk);
737 return err;
738 }
739 EXPORT_SYMBOL(inet_stream_connect);
740
741 /*
742 * Accept a pending connection. The TCP layer now gives BSD semantics.
743 */
744
inet_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)745 int inet_accept(struct socket *sock, struct socket *newsock, int flags,
746 bool kern)
747 {
748 struct sock *sk1 = sock->sk, *sk2;
749 int err = -EINVAL;
750
751 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
752 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, flags, &err, kern);
753 if (!sk2)
754 goto do_err;
755
756 lock_sock(sk2);
757
758 sock_rps_record_flow(sk2);
759 WARN_ON(!((1 << sk2->sk_state) &
760 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
761 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
762
763 if (test_bit(SOCK_SUPPORT_ZC, &sock->flags))
764 set_bit(SOCK_SUPPORT_ZC, &newsock->flags);
765 sock_graft(sk2, newsock);
766
767 newsock->state = SS_CONNECTED;
768 err = 0;
769 release_sock(sk2);
770 do_err:
771 return err;
772 }
773 EXPORT_SYMBOL(inet_accept);
774
775 /*
776 * This does both peername and sockname.
777 */
inet_getname(struct socket * sock,struct sockaddr * uaddr,int peer)778 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
779 int peer)
780 {
781 struct sock *sk = sock->sk;
782 struct inet_sock *inet = inet_sk(sk);
783 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
784
785 sin->sin_family = AF_INET;
786 lock_sock(sk);
787 if (peer) {
788 if (!inet->inet_dport ||
789 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
790 peer == 1)) {
791 release_sock(sk);
792 return -ENOTCONN;
793 }
794 sin->sin_port = inet->inet_dport;
795 sin->sin_addr.s_addr = inet->inet_daddr;
796 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
797 CGROUP_INET4_GETPEERNAME);
798 } else {
799 __be32 addr = inet->inet_rcv_saddr;
800 if (!addr)
801 addr = inet->inet_saddr;
802 sin->sin_port = inet->inet_sport;
803 sin->sin_addr.s_addr = addr;
804 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
805 CGROUP_INET4_GETSOCKNAME);
806 }
807 release_sock(sk);
808 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
809 return sizeof(*sin);
810 }
811 EXPORT_SYMBOL(inet_getname);
812
inet_send_prepare(struct sock * sk)813 int inet_send_prepare(struct sock *sk)
814 {
815 sock_rps_record_flow(sk);
816
817 /* We may need to bind the socket. */
818 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
819 inet_autobind(sk))
820 return -EAGAIN;
821
822 return 0;
823 }
824 EXPORT_SYMBOL_GPL(inet_send_prepare);
825
inet_sendmsg(struct socket * sock,struct msghdr * msg,size_t size)826 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
827 {
828 struct sock *sk = sock->sk;
829
830 if (unlikely(inet_send_prepare(sk)))
831 return -EAGAIN;
832
833 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
834 sk, msg, size);
835 }
836 EXPORT_SYMBOL(inet_sendmsg);
837
inet_sendpage(struct socket * sock,struct page * page,int offset,size_t size,int flags)838 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
839 size_t size, int flags)
840 {
841 struct sock *sk = sock->sk;
842 const struct proto *prot;
843
844 if (unlikely(inet_send_prepare(sk)))
845 return -EAGAIN;
846
847 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
848 prot = READ_ONCE(sk->sk_prot);
849 if (prot->sendpage)
850 return prot->sendpage(sk, page, offset, size, flags);
851 return sock_no_sendpage(sock, page, offset, size, flags);
852 }
853 EXPORT_SYMBOL(inet_sendpage);
854
855 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
856 size_t, int, int *));
inet_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)857 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
858 int flags)
859 {
860 struct sock *sk = sock->sk;
861 int addr_len = 0;
862 int err;
863
864 if (likely(!(flags & MSG_ERRQUEUE)))
865 sock_rps_record_flow(sk);
866
867 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
868 sk, msg, size, flags, &addr_len);
869 if (err >= 0)
870 msg->msg_namelen = addr_len;
871 return err;
872 }
873 EXPORT_SYMBOL(inet_recvmsg);
874
inet_shutdown(struct socket * sock,int how)875 int inet_shutdown(struct socket *sock, int how)
876 {
877 struct sock *sk = sock->sk;
878 int err = 0;
879
880 /* This should really check to make sure
881 * the socket is a TCP socket. (WHY AC...)
882 */
883 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
884 1->2 bit 2 snds.
885 2->3 */
886 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
887 return -EINVAL;
888
889 lock_sock(sk);
890 if (sock->state == SS_CONNECTING) {
891 if ((1 << sk->sk_state) &
892 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
893 sock->state = SS_DISCONNECTING;
894 else
895 sock->state = SS_CONNECTED;
896 }
897
898 switch (sk->sk_state) {
899 case TCP_CLOSE:
900 err = -ENOTCONN;
901 /* Hack to wake up other listeners, who can poll for
902 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
903 fallthrough;
904 default:
905 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how);
906 if (sk->sk_prot->shutdown)
907 sk->sk_prot->shutdown(sk, how);
908 break;
909
910 /* Remaining two branches are temporary solution for missing
911 * close() in multithreaded environment. It is _not_ a good idea,
912 * but we have no choice until close() is repaired at VFS level.
913 */
914 case TCP_LISTEN:
915 if (!(how & RCV_SHUTDOWN))
916 break;
917 fallthrough;
918 case TCP_SYN_SENT:
919 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
920 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
921 break;
922 }
923
924 /* Wake up anyone sleeping in poll. */
925 sk->sk_state_change(sk);
926 release_sock(sk);
927 return err;
928 }
929 EXPORT_SYMBOL(inet_shutdown);
930
931 /*
932 * ioctl() calls you can issue on an INET socket. Most of these are
933 * device configuration and stuff and very rarely used. Some ioctls
934 * pass on to the socket itself.
935 *
936 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
937 * loads the devconfigure module does its configuring and unloads it.
938 * There's a good 20K of config code hanging around the kernel.
939 */
940
inet_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)941 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
942 {
943 struct sock *sk = sock->sk;
944 int err = 0;
945 struct net *net = sock_net(sk);
946 void __user *p = (void __user *)arg;
947 struct ifreq ifr;
948 struct rtentry rt;
949
950 switch (cmd) {
951 case SIOCADDRT:
952 case SIOCDELRT:
953 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
954 return -EFAULT;
955 err = ip_rt_ioctl(net, cmd, &rt);
956 break;
957 case SIOCRTMSG:
958 err = -EINVAL;
959 break;
960 case SIOCDARP:
961 case SIOCGARP:
962 case SIOCSARP:
963 err = arp_ioctl(net, cmd, (void __user *)arg);
964 break;
965 case SIOCGIFADDR:
966 case SIOCGIFBRDADDR:
967 case SIOCGIFNETMASK:
968 case SIOCGIFDSTADDR:
969 case SIOCGIFPFLAGS:
970 if (get_user_ifreq(&ifr, NULL, p))
971 return -EFAULT;
972 err = devinet_ioctl(net, cmd, &ifr);
973 if (!err && put_user_ifreq(&ifr, p))
974 err = -EFAULT;
975 break;
976
977 case SIOCSIFADDR:
978 case SIOCSIFBRDADDR:
979 case SIOCSIFNETMASK:
980 case SIOCSIFDSTADDR:
981 case SIOCSIFPFLAGS:
982 case SIOCSIFFLAGS:
983 if (get_user_ifreq(&ifr, NULL, p))
984 return -EFAULT;
985 err = devinet_ioctl(net, cmd, &ifr);
986 break;
987 default:
988 if (sk->sk_prot->ioctl)
989 err = sk->sk_prot->ioctl(sk, cmd, arg);
990 else
991 err = -ENOIOCTLCMD;
992 break;
993 }
994 return err;
995 }
996 EXPORT_SYMBOL(inet_ioctl);
997
998 #ifdef CONFIG_COMPAT
inet_compat_routing_ioctl(struct sock * sk,unsigned int cmd,struct compat_rtentry __user * ur)999 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
1000 struct compat_rtentry __user *ur)
1001 {
1002 compat_uptr_t rtdev;
1003 struct rtentry rt;
1004
1005 if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
1006 3 * sizeof(struct sockaddr)) ||
1007 get_user(rt.rt_flags, &ur->rt_flags) ||
1008 get_user(rt.rt_metric, &ur->rt_metric) ||
1009 get_user(rt.rt_mtu, &ur->rt_mtu) ||
1010 get_user(rt.rt_window, &ur->rt_window) ||
1011 get_user(rt.rt_irtt, &ur->rt_irtt) ||
1012 get_user(rtdev, &ur->rt_dev))
1013 return -EFAULT;
1014
1015 rt.rt_dev = compat_ptr(rtdev);
1016 return ip_rt_ioctl(sock_net(sk), cmd, &rt);
1017 }
1018
inet_compat_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1019 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1020 {
1021 void __user *argp = compat_ptr(arg);
1022 struct sock *sk = sock->sk;
1023
1024 switch (cmd) {
1025 case SIOCADDRT:
1026 case SIOCDELRT:
1027 return inet_compat_routing_ioctl(sk, cmd, argp);
1028 default:
1029 if (!sk->sk_prot->compat_ioctl)
1030 return -ENOIOCTLCMD;
1031 return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1032 }
1033 }
1034 #endif /* CONFIG_COMPAT */
1035
1036 const struct proto_ops inet_stream_ops = {
1037 .family = PF_INET,
1038 .owner = THIS_MODULE,
1039 .release = inet_release,
1040 .bind = inet_bind,
1041 .connect = inet_stream_connect,
1042 .socketpair = sock_no_socketpair,
1043 .accept = inet_accept,
1044 .getname = inet_getname,
1045 .poll = tcp_poll,
1046 .ioctl = inet_ioctl,
1047 .gettstamp = sock_gettstamp,
1048 .listen = inet_listen,
1049 .shutdown = inet_shutdown,
1050 .setsockopt = sock_common_setsockopt,
1051 .getsockopt = sock_common_getsockopt,
1052 .sendmsg = inet_sendmsg,
1053 .recvmsg = inet_recvmsg,
1054 #ifdef CONFIG_MMU
1055 .mmap = tcp_mmap,
1056 #endif
1057 .sendpage = inet_sendpage,
1058 .splice_read = tcp_splice_read,
1059 .read_sock = tcp_read_sock,
1060 .read_skb = tcp_read_skb,
1061 .sendmsg_locked = tcp_sendmsg_locked,
1062 .sendpage_locked = tcp_sendpage_locked,
1063 .peek_len = tcp_peek_len,
1064 #ifdef CONFIG_COMPAT
1065 .compat_ioctl = inet_compat_ioctl,
1066 #endif
1067 .set_rcvlowat = tcp_set_rcvlowat,
1068 };
1069 EXPORT_SYMBOL(inet_stream_ops);
1070
1071 const struct proto_ops inet_dgram_ops = {
1072 .family = PF_INET,
1073 .owner = THIS_MODULE,
1074 .release = inet_release,
1075 .bind = inet_bind,
1076 .connect = inet_dgram_connect,
1077 .socketpair = sock_no_socketpair,
1078 .accept = sock_no_accept,
1079 .getname = inet_getname,
1080 .poll = udp_poll,
1081 .ioctl = inet_ioctl,
1082 .gettstamp = sock_gettstamp,
1083 .listen = sock_no_listen,
1084 .shutdown = inet_shutdown,
1085 .setsockopt = sock_common_setsockopt,
1086 .getsockopt = sock_common_getsockopt,
1087 .sendmsg = inet_sendmsg,
1088 .read_skb = udp_read_skb,
1089 .recvmsg = inet_recvmsg,
1090 .mmap = sock_no_mmap,
1091 .sendpage = inet_sendpage,
1092 .set_peek_off = sk_set_peek_off,
1093 #ifdef CONFIG_COMPAT
1094 .compat_ioctl = inet_compat_ioctl,
1095 #endif
1096 };
1097 EXPORT_SYMBOL(inet_dgram_ops);
1098
1099 /*
1100 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1101 * udp_poll
1102 */
1103 static const struct proto_ops inet_sockraw_ops = {
1104 .family = PF_INET,
1105 .owner = THIS_MODULE,
1106 .release = inet_release,
1107 .bind = inet_bind,
1108 .connect = inet_dgram_connect,
1109 .socketpair = sock_no_socketpair,
1110 .accept = sock_no_accept,
1111 .getname = inet_getname,
1112 .poll = datagram_poll,
1113 .ioctl = inet_ioctl,
1114 .gettstamp = sock_gettstamp,
1115 .listen = sock_no_listen,
1116 .shutdown = inet_shutdown,
1117 .setsockopt = sock_common_setsockopt,
1118 .getsockopt = sock_common_getsockopt,
1119 .sendmsg = inet_sendmsg,
1120 .recvmsg = inet_recvmsg,
1121 .mmap = sock_no_mmap,
1122 .sendpage = inet_sendpage,
1123 #ifdef CONFIG_COMPAT
1124 .compat_ioctl = inet_compat_ioctl,
1125 #endif
1126 };
1127
1128 static const struct net_proto_family inet_family_ops = {
1129 .family = PF_INET,
1130 .create = inet_create,
1131 .owner = THIS_MODULE,
1132 };
1133
1134 /* Upon startup we insert all the elements in inetsw_array[] into
1135 * the linked list inetsw.
1136 */
1137 static struct inet_protosw inetsw_array[] =
1138 {
1139 {
1140 .type = SOCK_STREAM,
1141 .protocol = IPPROTO_TCP,
1142 .prot = &tcp_prot,
1143 .ops = &inet_stream_ops,
1144 .flags = INET_PROTOSW_PERMANENT |
1145 INET_PROTOSW_ICSK,
1146 },
1147
1148 {
1149 .type = SOCK_DGRAM,
1150 .protocol = IPPROTO_UDP,
1151 .prot = &udp_prot,
1152 .ops = &inet_dgram_ops,
1153 .flags = INET_PROTOSW_PERMANENT,
1154 },
1155
1156 {
1157 .type = SOCK_DGRAM,
1158 .protocol = IPPROTO_ICMP,
1159 .prot = &ping_prot,
1160 .ops = &inet_sockraw_ops,
1161 .flags = INET_PROTOSW_REUSE,
1162 },
1163
1164 {
1165 .type = SOCK_RAW,
1166 .protocol = IPPROTO_IP, /* wild card */
1167 .prot = &raw_prot,
1168 .ops = &inet_sockraw_ops,
1169 .flags = INET_PROTOSW_REUSE,
1170 }
1171 };
1172
1173 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1174
inet_register_protosw(struct inet_protosw * p)1175 void inet_register_protosw(struct inet_protosw *p)
1176 {
1177 struct list_head *lh;
1178 struct inet_protosw *answer;
1179 int protocol = p->protocol;
1180 struct list_head *last_perm;
1181
1182 spin_lock_bh(&inetsw_lock);
1183
1184 if (p->type >= SOCK_MAX)
1185 goto out_illegal;
1186
1187 /* If we are trying to override a permanent protocol, bail. */
1188 last_perm = &inetsw[p->type];
1189 list_for_each(lh, &inetsw[p->type]) {
1190 answer = list_entry(lh, struct inet_protosw, list);
1191 /* Check only the non-wild match. */
1192 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1193 break;
1194 if (protocol == answer->protocol)
1195 goto out_permanent;
1196 last_perm = lh;
1197 }
1198
1199 /* Add the new entry after the last permanent entry if any, so that
1200 * the new entry does not override a permanent entry when matched with
1201 * a wild-card protocol. But it is allowed to override any existing
1202 * non-permanent entry. This means that when we remove this entry, the
1203 * system automatically returns to the old behavior.
1204 */
1205 list_add_rcu(&p->list, last_perm);
1206 out:
1207 spin_unlock_bh(&inetsw_lock);
1208
1209 return;
1210
1211 out_permanent:
1212 pr_err("Attempt to override permanent protocol %d\n", protocol);
1213 goto out;
1214
1215 out_illegal:
1216 pr_err("Ignoring attempt to register invalid socket type %d\n",
1217 p->type);
1218 goto out;
1219 }
1220 EXPORT_SYMBOL(inet_register_protosw);
1221
inet_unregister_protosw(struct inet_protosw * p)1222 void inet_unregister_protosw(struct inet_protosw *p)
1223 {
1224 if (INET_PROTOSW_PERMANENT & p->flags) {
1225 pr_err("Attempt to unregister permanent protocol %d\n",
1226 p->protocol);
1227 } else {
1228 spin_lock_bh(&inetsw_lock);
1229 list_del_rcu(&p->list);
1230 spin_unlock_bh(&inetsw_lock);
1231
1232 synchronize_net();
1233 }
1234 }
1235 EXPORT_SYMBOL(inet_unregister_protosw);
1236
inet_sk_reselect_saddr(struct sock * sk)1237 static int inet_sk_reselect_saddr(struct sock *sk)
1238 {
1239 struct inet_sock *inet = inet_sk(sk);
1240 __be32 old_saddr = inet->inet_saddr;
1241 __be32 daddr = inet->inet_daddr;
1242 struct flowi4 *fl4;
1243 struct rtable *rt;
1244 __be32 new_saddr;
1245 struct ip_options_rcu *inet_opt;
1246 int err;
1247
1248 inet_opt = rcu_dereference_protected(inet->inet_opt,
1249 lockdep_sock_is_held(sk));
1250 if (inet_opt && inet_opt->opt.srr)
1251 daddr = inet_opt->opt.faddr;
1252
1253 /* Query new route. */
1254 fl4 = &inet->cork.fl.u.ip4;
1255 rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if,
1256 sk->sk_protocol, inet->inet_sport,
1257 inet->inet_dport, sk);
1258 if (IS_ERR(rt))
1259 return PTR_ERR(rt);
1260
1261 new_saddr = fl4->saddr;
1262
1263 if (new_saddr == old_saddr) {
1264 sk_setup_caps(sk, &rt->dst);
1265 return 0;
1266 }
1267
1268 err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET);
1269 if (err) {
1270 ip_rt_put(rt);
1271 return err;
1272 }
1273
1274 sk_setup_caps(sk, &rt->dst);
1275
1276 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1277 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1278 __func__, &old_saddr, &new_saddr);
1279 }
1280
1281 /*
1282 * XXX The only one ugly spot where we need to
1283 * XXX really change the sockets identity after
1284 * XXX it has entered the hashes. -DaveM
1285 *
1286 * Besides that, it does not check for connection
1287 * uniqueness. Wait for troubles.
1288 */
1289 return __sk_prot_rehash(sk);
1290 }
1291
inet_sk_rebuild_header(struct sock * sk)1292 int inet_sk_rebuild_header(struct sock *sk)
1293 {
1294 struct inet_sock *inet = inet_sk(sk);
1295 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1296 __be32 daddr;
1297 struct ip_options_rcu *inet_opt;
1298 struct flowi4 *fl4;
1299 int err;
1300
1301 /* Route is OK, nothing to do. */
1302 if (rt)
1303 return 0;
1304
1305 /* Reroute. */
1306 rcu_read_lock();
1307 inet_opt = rcu_dereference(inet->inet_opt);
1308 daddr = inet->inet_daddr;
1309 if (inet_opt && inet_opt->opt.srr)
1310 daddr = inet_opt->opt.faddr;
1311 rcu_read_unlock();
1312 fl4 = &inet->cork.fl.u.ip4;
1313 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1314 inet->inet_dport, inet->inet_sport,
1315 sk->sk_protocol, RT_CONN_FLAGS(sk),
1316 sk->sk_bound_dev_if);
1317 if (!IS_ERR(rt)) {
1318 err = 0;
1319 sk_setup_caps(sk, &rt->dst);
1320 } else {
1321 err = PTR_ERR(rt);
1322
1323 /* Routing failed... */
1324 sk->sk_route_caps = 0;
1325 /*
1326 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1327 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1328 */
1329 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1330 sk->sk_state != TCP_SYN_SENT ||
1331 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1332 (err = inet_sk_reselect_saddr(sk)) != 0)
1333 sk->sk_err_soft = -err;
1334 }
1335
1336 return err;
1337 }
1338 EXPORT_SYMBOL(inet_sk_rebuild_header);
1339
inet_sk_set_state(struct sock * sk,int state)1340 void inet_sk_set_state(struct sock *sk, int state)
1341 {
1342 trace_inet_sock_set_state(sk, sk->sk_state, state);
1343 sk->sk_state = state;
1344 }
1345 EXPORT_SYMBOL(inet_sk_set_state);
1346
inet_sk_state_store(struct sock * sk,int newstate)1347 void inet_sk_state_store(struct sock *sk, int newstate)
1348 {
1349 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1350 smp_store_release(&sk->sk_state, newstate);
1351 }
1352
inet_gso_segment(struct sk_buff * skb,netdev_features_t features)1353 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1354 netdev_features_t features)
1355 {
1356 bool udpfrag = false, fixedid = false, gso_partial, encap;
1357 struct sk_buff *segs = ERR_PTR(-EINVAL);
1358 const struct net_offload *ops;
1359 unsigned int offset = 0;
1360 struct iphdr *iph;
1361 int proto, tot_len;
1362 int nhoff;
1363 int ihl;
1364 int id;
1365
1366 skb_reset_network_header(skb);
1367 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1368 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1369 goto out;
1370
1371 iph = ip_hdr(skb);
1372 ihl = iph->ihl * 4;
1373 if (ihl < sizeof(*iph))
1374 goto out;
1375
1376 id = ntohs(iph->id);
1377 proto = iph->protocol;
1378
1379 /* Warning: after this point, iph might be no longer valid */
1380 if (unlikely(!pskb_may_pull(skb, ihl)))
1381 goto out;
1382 __skb_pull(skb, ihl);
1383
1384 encap = SKB_GSO_CB(skb)->encap_level > 0;
1385 if (encap)
1386 features &= skb->dev->hw_enc_features;
1387 SKB_GSO_CB(skb)->encap_level += ihl;
1388
1389 skb_reset_transport_header(skb);
1390
1391 segs = ERR_PTR(-EPROTONOSUPPORT);
1392
1393 if (!skb->encapsulation || encap) {
1394 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1395 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1396
1397 /* fixed ID is invalid if DF bit is not set */
1398 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1399 goto out;
1400 }
1401
1402 ops = rcu_dereference(inet_offloads[proto]);
1403 if (likely(ops && ops->callbacks.gso_segment)) {
1404 segs = ops->callbacks.gso_segment(skb, features);
1405 if (!segs)
1406 skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1407 }
1408
1409 if (IS_ERR_OR_NULL(segs))
1410 goto out;
1411
1412 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1413
1414 skb = segs;
1415 do {
1416 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1417 if (udpfrag) {
1418 iph->frag_off = htons(offset >> 3);
1419 if (skb->next)
1420 iph->frag_off |= htons(IP_MF);
1421 offset += skb->len - nhoff - ihl;
1422 tot_len = skb->len - nhoff;
1423 } else if (skb_is_gso(skb)) {
1424 if (!fixedid) {
1425 iph->id = htons(id);
1426 id += skb_shinfo(skb)->gso_segs;
1427 }
1428
1429 if (gso_partial)
1430 tot_len = skb_shinfo(skb)->gso_size +
1431 SKB_GSO_CB(skb)->data_offset +
1432 skb->head - (unsigned char *)iph;
1433 else
1434 tot_len = skb->len - nhoff;
1435 } else {
1436 if (!fixedid)
1437 iph->id = htons(id++);
1438 tot_len = skb->len - nhoff;
1439 }
1440 iph->tot_len = htons(tot_len);
1441 ip_send_check(iph);
1442 if (encap)
1443 skb_reset_inner_headers(skb);
1444 skb->network_header = (u8 *)iph - skb->head;
1445 skb_reset_mac_len(skb);
1446 } while ((skb = skb->next));
1447
1448 out:
1449 return segs;
1450 }
1451
ipip_gso_segment(struct sk_buff * skb,netdev_features_t features)1452 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1453 netdev_features_t features)
1454 {
1455 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1456 return ERR_PTR(-EINVAL);
1457
1458 return inet_gso_segment(skb, features);
1459 }
1460
inet_gro_receive(struct list_head * head,struct sk_buff * skb)1461 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1462 {
1463 const struct net_offload *ops;
1464 struct sk_buff *pp = NULL;
1465 const struct iphdr *iph;
1466 struct sk_buff *p;
1467 unsigned int hlen;
1468 unsigned int off;
1469 unsigned int id;
1470 int flush = 1;
1471 int proto;
1472
1473 off = skb_gro_offset(skb);
1474 hlen = off + sizeof(*iph);
1475 iph = skb_gro_header(skb, hlen, off);
1476 if (unlikely(!iph))
1477 goto out;
1478
1479 proto = iph->protocol;
1480
1481 ops = rcu_dereference(inet_offloads[proto]);
1482 if (!ops || !ops->callbacks.gro_receive)
1483 goto out;
1484
1485 if (*(u8 *)iph != 0x45)
1486 goto out;
1487
1488 if (ip_is_fragment(iph))
1489 goto out;
1490
1491 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1492 goto out;
1493
1494 id = ntohl(*(__be32 *)&iph->id);
1495 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1496 id >>= 16;
1497
1498 list_for_each_entry(p, head, list) {
1499 struct iphdr *iph2;
1500 u16 flush_id;
1501
1502 if (!NAPI_GRO_CB(p)->same_flow)
1503 continue;
1504
1505 iph2 = (struct iphdr *)(p->data + off);
1506 /* The above works because, with the exception of the top
1507 * (inner most) layer, we only aggregate pkts with the same
1508 * hdr length so all the hdrs we'll need to verify will start
1509 * at the same offset.
1510 */
1511 if ((iph->protocol ^ iph2->protocol) |
1512 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1513 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1514 NAPI_GRO_CB(p)->same_flow = 0;
1515 continue;
1516 }
1517
1518 /* All fields must match except length and checksum. */
1519 NAPI_GRO_CB(p)->flush |=
1520 (iph->ttl ^ iph2->ttl) |
1521 (iph->tos ^ iph2->tos) |
1522 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1523
1524 NAPI_GRO_CB(p)->flush |= flush;
1525
1526 /* We need to store of the IP ID check to be included later
1527 * when we can verify that this packet does in fact belong
1528 * to a given flow.
1529 */
1530 flush_id = (u16)(id - ntohs(iph2->id));
1531
1532 /* This bit of code makes it much easier for us to identify
1533 * the cases where we are doing atomic vs non-atomic IP ID
1534 * checks. Specifically an atomic check can return IP ID
1535 * values 0 - 0xFFFF, while a non-atomic check can only
1536 * return 0 or 0xFFFF.
1537 */
1538 if (!NAPI_GRO_CB(p)->is_atomic ||
1539 !(iph->frag_off & htons(IP_DF))) {
1540 flush_id ^= NAPI_GRO_CB(p)->count;
1541 flush_id = flush_id ? 0xFFFF : 0;
1542 }
1543
1544 /* If the previous IP ID value was based on an atomic
1545 * datagram we can overwrite the value and ignore it.
1546 */
1547 if (NAPI_GRO_CB(skb)->is_atomic)
1548 NAPI_GRO_CB(p)->flush_id = flush_id;
1549 else
1550 NAPI_GRO_CB(p)->flush_id |= flush_id;
1551 }
1552
1553 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1554 NAPI_GRO_CB(skb)->flush |= flush;
1555 skb_set_network_header(skb, off);
1556 /* The above will be needed by the transport layer if there is one
1557 * immediately following this IP hdr.
1558 */
1559
1560 /* Note : No need to call skb_gro_postpull_rcsum() here,
1561 * as we already checked checksum over ipv4 header was 0
1562 */
1563 skb_gro_pull(skb, sizeof(*iph));
1564 skb_set_transport_header(skb, skb_gro_offset(skb));
1565
1566 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1567 ops->callbacks.gro_receive, head, skb);
1568
1569 out:
1570 skb_gro_flush_final(skb, pp, flush);
1571
1572 return pp;
1573 }
1574
ipip_gro_receive(struct list_head * head,struct sk_buff * skb)1575 static struct sk_buff *ipip_gro_receive(struct list_head *head,
1576 struct sk_buff *skb)
1577 {
1578 if (NAPI_GRO_CB(skb)->encap_mark) {
1579 NAPI_GRO_CB(skb)->flush = 1;
1580 return NULL;
1581 }
1582
1583 NAPI_GRO_CB(skb)->encap_mark = 1;
1584
1585 return inet_gro_receive(head, skb);
1586 }
1587
1588 #define SECONDS_PER_DAY 86400
1589
1590 /* inet_current_timestamp - Return IP network timestamp
1591 *
1592 * Return milliseconds since midnight in network byte order.
1593 */
inet_current_timestamp(void)1594 __be32 inet_current_timestamp(void)
1595 {
1596 u32 secs;
1597 u32 msecs;
1598 struct timespec64 ts;
1599
1600 ktime_get_real_ts64(&ts);
1601
1602 /* Get secs since midnight. */
1603 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1604 /* Convert to msecs. */
1605 msecs = secs * MSEC_PER_SEC;
1606 /* Convert nsec to msec. */
1607 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1608
1609 /* Convert to network byte order. */
1610 return htonl(msecs);
1611 }
1612 EXPORT_SYMBOL(inet_current_timestamp);
1613
inet_recv_error(struct sock * sk,struct msghdr * msg,int len,int * addr_len)1614 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1615 {
1616 unsigned int family = READ_ONCE(sk->sk_family);
1617
1618 if (family == AF_INET)
1619 return ip_recv_error(sk, msg, len, addr_len);
1620 #if IS_ENABLED(CONFIG_IPV6)
1621 if (family == AF_INET6)
1622 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1623 #endif
1624 return -EINVAL;
1625 }
1626 EXPORT_SYMBOL(inet_recv_error);
1627
inet_gro_complete(struct sk_buff * skb,int nhoff)1628 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1629 {
1630 __be16 newlen = htons(skb->len - nhoff);
1631 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1632 const struct net_offload *ops;
1633 int proto = iph->protocol;
1634 int err = -ENOSYS;
1635
1636 if (skb->encapsulation) {
1637 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1638 skb_set_inner_network_header(skb, nhoff);
1639 }
1640
1641 csum_replace2(&iph->check, iph->tot_len, newlen);
1642 iph->tot_len = newlen;
1643
1644 ops = rcu_dereference(inet_offloads[proto]);
1645 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1646 goto out;
1647
1648 /* Only need to add sizeof(*iph) to get to the next hdr below
1649 * because any hdr with option will have been flushed in
1650 * inet_gro_receive().
1651 */
1652 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1653 tcp4_gro_complete, udp4_gro_complete,
1654 skb, nhoff + sizeof(*iph));
1655
1656 out:
1657 return err;
1658 }
1659
ipip_gro_complete(struct sk_buff * skb,int nhoff)1660 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1661 {
1662 skb->encapsulation = 1;
1663 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1664 return inet_gro_complete(skb, nhoff);
1665 }
1666
inet_ctl_sock_create(struct sock ** sk,unsigned short family,unsigned short type,unsigned char protocol,struct net * net)1667 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1668 unsigned short type, unsigned char protocol,
1669 struct net *net)
1670 {
1671 struct socket *sock;
1672 int rc = sock_create_kern(net, family, type, protocol, &sock);
1673
1674 if (rc == 0) {
1675 *sk = sock->sk;
1676 (*sk)->sk_allocation = GFP_ATOMIC;
1677 /*
1678 * Unhash it so that IP input processing does not even see it,
1679 * we do not wish this socket to see incoming packets.
1680 */
1681 (*sk)->sk_prot->unhash(*sk);
1682 }
1683 return rc;
1684 }
1685 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1686
snmp_fold_field(void __percpu * mib,int offt)1687 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1688 {
1689 unsigned long res = 0;
1690 int i;
1691
1692 for_each_possible_cpu(i)
1693 res += snmp_get_cpu_field(mib, i, offt);
1694 return res;
1695 }
1696 EXPORT_SYMBOL_GPL(snmp_fold_field);
1697
1698 #if BITS_PER_LONG==32
1699
snmp_get_cpu_field64(void __percpu * mib,int cpu,int offt,size_t syncp_offset)1700 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1701 size_t syncp_offset)
1702 {
1703 void *bhptr;
1704 struct u64_stats_sync *syncp;
1705 u64 v;
1706 unsigned int start;
1707
1708 bhptr = per_cpu_ptr(mib, cpu);
1709 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1710 do {
1711 start = u64_stats_fetch_begin_irq(syncp);
1712 v = *(((u64 *)bhptr) + offt);
1713 } while (u64_stats_fetch_retry_irq(syncp, start));
1714
1715 return v;
1716 }
1717 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1718
snmp_fold_field64(void __percpu * mib,int offt,size_t syncp_offset)1719 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1720 {
1721 u64 res = 0;
1722 int cpu;
1723
1724 for_each_possible_cpu(cpu) {
1725 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1726 }
1727 return res;
1728 }
1729 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1730 #endif
1731
1732 #ifdef CONFIG_IP_MULTICAST
1733 static const struct net_protocol igmp_protocol = {
1734 .handler = igmp_rcv,
1735 };
1736 #endif
1737
1738 static const struct net_protocol tcp_protocol = {
1739 .handler = tcp_v4_rcv,
1740 .err_handler = tcp_v4_err,
1741 .no_policy = 1,
1742 .icmp_strict_tag_validation = 1,
1743 };
1744
1745 static const struct net_protocol udp_protocol = {
1746 .handler = udp_rcv,
1747 .err_handler = udp_err,
1748 .no_policy = 1,
1749 };
1750
1751 static const struct net_protocol icmp_protocol = {
1752 .handler = icmp_rcv,
1753 .err_handler = icmp_err,
1754 .no_policy = 1,
1755 };
1756
ipv4_mib_init_net(struct net * net)1757 static __net_init int ipv4_mib_init_net(struct net *net)
1758 {
1759 int i;
1760
1761 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1762 if (!net->mib.tcp_statistics)
1763 goto err_tcp_mib;
1764 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1765 if (!net->mib.ip_statistics)
1766 goto err_ip_mib;
1767
1768 for_each_possible_cpu(i) {
1769 struct ipstats_mib *af_inet_stats;
1770 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1771 u64_stats_init(&af_inet_stats->syncp);
1772 }
1773
1774 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1775 if (!net->mib.net_statistics)
1776 goto err_net_mib;
1777 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1778 if (!net->mib.udp_statistics)
1779 goto err_udp_mib;
1780 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1781 if (!net->mib.udplite_statistics)
1782 goto err_udplite_mib;
1783 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1784 if (!net->mib.icmp_statistics)
1785 goto err_icmp_mib;
1786 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1787 GFP_KERNEL);
1788 if (!net->mib.icmpmsg_statistics)
1789 goto err_icmpmsg_mib;
1790
1791 tcp_mib_init(net);
1792 return 0;
1793
1794 err_icmpmsg_mib:
1795 free_percpu(net->mib.icmp_statistics);
1796 err_icmp_mib:
1797 free_percpu(net->mib.udplite_statistics);
1798 err_udplite_mib:
1799 free_percpu(net->mib.udp_statistics);
1800 err_udp_mib:
1801 free_percpu(net->mib.net_statistics);
1802 err_net_mib:
1803 free_percpu(net->mib.ip_statistics);
1804 err_ip_mib:
1805 free_percpu(net->mib.tcp_statistics);
1806 err_tcp_mib:
1807 return -ENOMEM;
1808 }
1809
ipv4_mib_exit_net(struct net * net)1810 static __net_exit void ipv4_mib_exit_net(struct net *net)
1811 {
1812 kfree(net->mib.icmpmsg_statistics);
1813 free_percpu(net->mib.icmp_statistics);
1814 free_percpu(net->mib.udplite_statistics);
1815 free_percpu(net->mib.udp_statistics);
1816 free_percpu(net->mib.net_statistics);
1817 free_percpu(net->mib.ip_statistics);
1818 free_percpu(net->mib.tcp_statistics);
1819 #ifdef CONFIG_MPTCP
1820 /* allocated on demand, see mptcp_init_sock() */
1821 free_percpu(net->mib.mptcp_statistics);
1822 #endif
1823 }
1824
1825 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1826 .init = ipv4_mib_init_net,
1827 .exit = ipv4_mib_exit_net,
1828 };
1829
init_ipv4_mibs(void)1830 static int __init init_ipv4_mibs(void)
1831 {
1832 return register_pernet_subsys(&ipv4_mib_ops);
1833 }
1834
inet_init_net(struct net * net)1835 static __net_init int inet_init_net(struct net *net)
1836 {
1837 /*
1838 * Set defaults for local port range
1839 */
1840 seqlock_init(&net->ipv4.ip_local_ports.lock);
1841 net->ipv4.ip_local_ports.range[0] = 32768;
1842 net->ipv4.ip_local_ports.range[1] = 60999;
1843
1844 seqlock_init(&net->ipv4.ping_group_range.lock);
1845 /*
1846 * Sane defaults - nobody may create ping sockets.
1847 * Boot scripts should set this to distro-specific group.
1848 */
1849 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1850 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1851
1852 /* Default values for sysctl-controlled parameters.
1853 * We set them here, in case sysctl is not compiled.
1854 */
1855 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1856 net->ipv4.sysctl_ip_fwd_update_priority = 1;
1857 net->ipv4.sysctl_ip_dynaddr = 0;
1858 net->ipv4.sysctl_ip_early_demux = 1;
1859 net->ipv4.sysctl_udp_early_demux = 1;
1860 net->ipv4.sysctl_tcp_early_demux = 1;
1861 net->ipv4.sysctl_nexthop_compat_mode = 1;
1862 #ifdef CONFIG_SYSCTL
1863 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1864 #endif
1865
1866 /* Some igmp sysctl, whose values are always used */
1867 net->ipv4.sysctl_igmp_max_memberships = 20;
1868 net->ipv4.sysctl_igmp_max_msf = 10;
1869 /* IGMP reports for link-local multicast groups are enabled by default */
1870 net->ipv4.sysctl_igmp_llm_reports = 1;
1871 net->ipv4.sysctl_igmp_qrv = 2;
1872
1873 net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1874
1875 return 0;
1876 }
1877
1878 static __net_initdata struct pernet_operations af_inet_ops = {
1879 .init = inet_init_net,
1880 };
1881
init_inet_pernet_ops(void)1882 static int __init init_inet_pernet_ops(void)
1883 {
1884 return register_pernet_subsys(&af_inet_ops);
1885 }
1886
1887 static int ipv4_proc_init(void);
1888
1889 /*
1890 * IP protocol layer initialiser
1891 */
1892
1893 static struct packet_offload ip_packet_offload __read_mostly = {
1894 .type = cpu_to_be16(ETH_P_IP),
1895 .callbacks = {
1896 .gso_segment = inet_gso_segment,
1897 .gro_receive = inet_gro_receive,
1898 .gro_complete = inet_gro_complete,
1899 },
1900 };
1901
1902 static const struct net_offload ipip_offload = {
1903 .callbacks = {
1904 .gso_segment = ipip_gso_segment,
1905 .gro_receive = ipip_gro_receive,
1906 .gro_complete = ipip_gro_complete,
1907 },
1908 };
1909
ipip_offload_init(void)1910 static int __init ipip_offload_init(void)
1911 {
1912 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1913 }
1914
ipv4_offload_init(void)1915 static int __init ipv4_offload_init(void)
1916 {
1917 /*
1918 * Add offloads
1919 */
1920 if (udpv4_offload_init() < 0)
1921 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1922 if (tcpv4_offload_init() < 0)
1923 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1924 if (ipip_offload_init() < 0)
1925 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1926
1927 dev_add_offload(&ip_packet_offload);
1928 return 0;
1929 }
1930
1931 fs_initcall(ipv4_offload_init);
1932
1933 static struct packet_type ip_packet_type __read_mostly = {
1934 .type = cpu_to_be16(ETH_P_IP),
1935 .func = ip_rcv,
1936 .list_func = ip_list_rcv,
1937 };
1938
inet_init(void)1939 static int __init inet_init(void)
1940 {
1941 struct inet_protosw *q;
1942 struct list_head *r;
1943 int rc;
1944
1945 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1946
1947 raw_hashinfo_init(&raw_v4_hashinfo);
1948
1949 rc = proto_register(&tcp_prot, 1);
1950 if (rc)
1951 goto out;
1952
1953 rc = proto_register(&udp_prot, 1);
1954 if (rc)
1955 goto out_unregister_tcp_proto;
1956
1957 rc = proto_register(&raw_prot, 1);
1958 if (rc)
1959 goto out_unregister_udp_proto;
1960
1961 rc = proto_register(&ping_prot, 1);
1962 if (rc)
1963 goto out_unregister_raw_proto;
1964
1965 /*
1966 * Tell SOCKET that we are alive...
1967 */
1968
1969 (void)sock_register(&inet_family_ops);
1970
1971 #ifdef CONFIG_SYSCTL
1972 ip_static_sysctl_init();
1973 #endif
1974
1975 /*
1976 * Add all the base protocols.
1977 */
1978
1979 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1980 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1981 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1982 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1983 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1984 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1985 #ifdef CONFIG_IP_MULTICAST
1986 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1987 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1988 #endif
1989
1990 /* Register the socket-side information for inet_create. */
1991 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1992 INIT_LIST_HEAD(r);
1993
1994 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1995 inet_register_protosw(q);
1996
1997 /*
1998 * Set the ARP module up
1999 */
2000
2001 arp_init();
2002
2003 /*
2004 * Set the IP module up
2005 */
2006
2007 ip_init();
2008
2009 /* Initialise per-cpu ipv4 mibs */
2010 if (init_ipv4_mibs())
2011 panic("%s: Cannot init ipv4 mibs\n", __func__);
2012
2013 /* Setup TCP slab cache for open requests. */
2014 tcp_init();
2015
2016 /* Setup UDP memory threshold */
2017 udp_init();
2018
2019 /* Add UDP-Lite (RFC 3828) */
2020 udplite4_register();
2021
2022 raw_init();
2023
2024 ping_init();
2025
2026 /*
2027 * Set the ICMP layer up
2028 */
2029
2030 if (icmp_init() < 0)
2031 panic("Failed to create the ICMP control socket.\n");
2032
2033 /*
2034 * Initialise the multicast router
2035 */
2036 #if defined(CONFIG_IP_MROUTE)
2037 if (ip_mr_init())
2038 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2039 #endif
2040
2041 if (init_inet_pernet_ops())
2042 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2043
2044 ipv4_proc_init();
2045
2046 ipfrag_init();
2047
2048 dev_add_pack(&ip_packet_type);
2049
2050 ip_tunnel_core_init();
2051
2052 rc = 0;
2053 out:
2054 return rc;
2055 out_unregister_raw_proto:
2056 proto_unregister(&raw_prot);
2057 out_unregister_udp_proto:
2058 proto_unregister(&udp_prot);
2059 out_unregister_tcp_proto:
2060 proto_unregister(&tcp_prot);
2061 goto out;
2062 }
2063
2064 fs_initcall(inet_init);
2065
2066 /* ------------------------------------------------------------------------ */
2067
2068 #ifdef CONFIG_PROC_FS
ipv4_proc_init(void)2069 static int __init ipv4_proc_init(void)
2070 {
2071 int rc = 0;
2072
2073 if (raw_proc_init())
2074 goto out_raw;
2075 if (tcp4_proc_init())
2076 goto out_tcp;
2077 if (udp4_proc_init())
2078 goto out_udp;
2079 if (ping_proc_init())
2080 goto out_ping;
2081 if (ip_misc_proc_init())
2082 goto out_misc;
2083 out:
2084 return rc;
2085 out_misc:
2086 ping_proc_exit();
2087 out_ping:
2088 udp4_proc_exit();
2089 out_udp:
2090 tcp4_proc_exit();
2091 out_tcp:
2092 raw_proc_exit();
2093 out_raw:
2094 rc = -ENOMEM;
2095 goto out;
2096 }
2097
2098 #else /* CONFIG_PROC_FS */
ipv4_proc_init(void)2099 static int __init ipv4_proc_init(void)
2100 {
2101 return 0;
2102 }
2103 #endif /* CONFIG_PROC_FS */
2104