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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 */
126static struct list_head inetsw[SOCK_MAX];
127static DEFINE_SPINLOCK(inetsw_lock);
128
129/* New destruction routine */
130
131void inet_sock_destruct(struct sock *sk)
132{
133 struct inet_sock *inet = inet_sk(sk);
134
135 __skb_queue_purge(&sk->sk_receive_queue);
136 if (sk->sk_rx_skb_cache) {
137 __kfree_skb(sk->sk_rx_skb_cache);
138 sk->sk_rx_skb_cache = NULL;
139 }
140 __skb_queue_purge(&sk->sk_error_queue);
141
142 sk_mem_reclaim(sk);
143
144 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
145 pr_err("Attempt to release TCP socket in state %d %p\n",
146 sk->sk_state, sk);
147 return;
148 }
149 if (!sock_flag(sk, SOCK_DEAD)) {
150 pr_err("Attempt to release alive inet socket %p\n", sk);
151 return;
152 }
153
154 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
155 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
156 WARN_ON(sk->sk_wmem_queued);
157 WARN_ON(sk->sk_forward_alloc);
158
159 kfree(rcu_dereference_protected(inet->inet_opt, 1));
160 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
161 dst_release(sk->sk_rx_dst);
162 sk_refcnt_debug_dec(sk);
163}
164EXPORT_SYMBOL(inet_sock_destruct);
165
166/*
167 * The routines beyond this point handle the behaviour of an AF_INET
168 * socket object. Mostly it punts to the subprotocols of IP to do
169 * the work.
170 */
171
172/*
173 * Automatically bind an unbound socket.
174 */
175
176static int inet_autobind(struct sock *sk)
177{
178 struct inet_sock *inet;
179 /* We may need to bind the socket. */
180 lock_sock(sk);
181 inet = inet_sk(sk);
182 if (!inet->inet_num) {
183 if (sk->sk_prot->get_port(sk, 0)) {
184 release_sock(sk);
185 return -EAGAIN;
186 }
187 inet->inet_sport = htons(inet->inet_num);
188 }
189 release_sock(sk);
190 return 0;
191}
192
193/*
194 * Move a socket into listening state.
195 */
196int inet_listen(struct socket *sock, int backlog)
197{
198 struct sock *sk = sock->sk;
199 unsigned char old_state;
200 int err, tcp_fastopen;
201
202 lock_sock(sk);
203
204 err = -EINVAL;
205 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
206 goto out;
207
208 old_state = sk->sk_state;
209 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
210 goto out;
211
212 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
213 /* Really, if the socket is already in listen state
214 * we can only allow the backlog to be adjusted.
215 */
216 if (old_state != TCP_LISTEN) {
217 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
218 * Note that only TCP sockets (SOCK_STREAM) will reach here.
219 * Also fastopen backlog may already been set via the option
220 * because the socket was in TCP_LISTEN state previously but
221 * was shutdown() rather than close().
222 */
223 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen;
224 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
225 (tcp_fastopen & TFO_SERVER_ENABLE) &&
226 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
227 fastopen_queue_tune(sk, backlog);
228 tcp_fastopen_init_key_once(sock_net(sk));
229 }
230
231 err = inet_csk_listen_start(sk, backlog);
232 if (err)
233 goto out;
234 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
235 }
236 err = 0;
237
238out:
239 release_sock(sk);
240 return err;
241}
242EXPORT_SYMBOL(inet_listen);
243
244/*
245 * Create an inet socket.
246 */
247
248static int inet_create(struct net *net, struct socket *sock, int protocol,
249 int kern)
250{
251 struct sock *sk;
252 struct inet_protosw *answer;
253 struct inet_sock *inet;
254 struct proto *answer_prot;
255 unsigned char answer_flags;
256 int try_loading_module = 0;
257 int err;
258
259 if (protocol < 0 || protocol >= IPPROTO_MAX)
260 return -EINVAL;
261
262 sock->state = SS_UNCONNECTED;
263
264 /* Look for the requested type/protocol pair. */
265lookup_protocol:
266 err = -ESOCKTNOSUPPORT;
267 rcu_read_lock();
268 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
269
270 err = 0;
271 /* Check the non-wild match. */
272 if (protocol == answer->protocol) {
273 if (protocol != IPPROTO_IP)
274 break;
275 } else {
276 /* Check for the two wild cases. */
277 if (IPPROTO_IP == protocol) {
278 protocol = answer->protocol;
279 break;
280 }
281 if (IPPROTO_IP == answer->protocol)
282 break;
283 }
284 err = -EPROTONOSUPPORT;
285 }
286
287 if (unlikely(err)) {
288 if (try_loading_module < 2) {
289 rcu_read_unlock();
290 /*
291 * Be more specific, e.g. net-pf-2-proto-132-type-1
292 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
293 */
294 if (++try_loading_module == 1)
295 request_module("net-pf-%d-proto-%d-type-%d",
296 PF_INET, protocol, sock->type);
297 /*
298 * Fall back to generic, e.g. net-pf-2-proto-132
299 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
300 */
301 else
302 request_module("net-pf-%d-proto-%d",
303 PF_INET, protocol);
304 goto lookup_protocol;
305 } else
306 goto out_rcu_unlock;
307 }
308
309 err = -EPERM;
310 if (sock->type == SOCK_RAW && !kern &&
311 !ns_capable(net->user_ns, CAP_NET_RAW))
312 goto out_rcu_unlock;
313
314 sock->ops = answer->ops;
315 answer_prot = answer->prot;
316 answer_flags = answer->flags;
317 rcu_read_unlock();
318
319 WARN_ON(!answer_prot->slab);
320
321 err = -ENOMEM;
322 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
323 if (!sk)
324 goto out;
325
326 err = 0;
327 if (INET_PROTOSW_REUSE & answer_flags)
328 sk->sk_reuse = SK_CAN_REUSE;
329
330 inet = inet_sk(sk);
331 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
332
333 inet->nodefrag = 0;
334
335 if (SOCK_RAW == sock->type) {
336 inet->inet_num = protocol;
337 if (IPPROTO_RAW == protocol)
338 inet->hdrincl = 1;
339 }
340
341 if (net->ipv4.sysctl_ip_no_pmtu_disc)
342 inet->pmtudisc = IP_PMTUDISC_DONT;
343 else
344 inet->pmtudisc = IP_PMTUDISC_WANT;
345
346 inet->inet_id = 0;
347
348 sock_init_data(sock, sk);
349
350 sk->sk_destruct = inet_sock_destruct;
351 sk->sk_protocol = protocol;
352 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
353
354 inet->uc_ttl = -1;
355 inet->mc_loop = 1;
356 inet->mc_ttl = 1;
357 inet->mc_all = 1;
358 inet->mc_index = 0;
359 inet->mc_list = NULL;
360 inet->rcv_tos = 0;
361
362 sk_refcnt_debug_inc(sk);
363
364 if (inet->inet_num) {
365 /* It assumes that any protocol which allows
366 * the user to assign a number at socket
367 * creation time automatically
368 * shares.
369 */
370 inet->inet_sport = htons(inet->inet_num);
371 /* Add to protocol hash chains. */
372 err = sk->sk_prot->hash(sk);
373 if (err) {
374 sk_common_release(sk);
375 goto out;
376 }
377 }
378
379 if (sk->sk_prot->init) {
380 err = sk->sk_prot->init(sk);
381 if (err) {
382 sk_common_release(sk);
383 goto out;
384 }
385 }
386
387 if (!kern) {
388 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
389 if (err) {
390 sk_common_release(sk);
391 goto out;
392 }
393 }
394out:
395 return err;
396out_rcu_unlock:
397 rcu_read_unlock();
398 goto out;
399}
400
401
402/*
403 * The peer socket should always be NULL (or else). When we call this
404 * function we are destroying the object and from then on nobody
405 * should refer to it.
406 */
407int inet_release(struct socket *sock)
408{
409 struct sock *sk = sock->sk;
410
411 if (sk) {
412 long timeout;
413
414 if (!sk->sk_kern_sock)
415 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
416
417 /* Applications forget to leave groups before exiting */
418 ip_mc_drop_socket(sk);
419
420 /* If linger is set, we don't return until the close
421 * is complete. Otherwise we return immediately. The
422 * actually closing is done the same either way.
423 *
424 * If the close is due to the process exiting, we never
425 * linger..
426 */
427 timeout = 0;
428 if (sock_flag(sk, SOCK_LINGER) &&
429 !(current->flags & PF_EXITING))
430 timeout = sk->sk_lingertime;
431 sk->sk_prot->close(sk, timeout);
432 sock->sk = NULL;
433 }
434 return 0;
435}
436EXPORT_SYMBOL(inet_release);
437
438int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
439{
440 struct sock *sk = sock->sk;
441 u32 flags = BIND_WITH_LOCK;
442 int err;
443
444 /* If the socket has its own bind function then use it. (RAW) */
445 if (sk->sk_prot->bind) {
446 return sk->sk_prot->bind(sk, uaddr, addr_len);
447 }
448 if (addr_len < sizeof(struct sockaddr_in))
449 return -EINVAL;
450
451 /* BPF prog is run before any checks are done so that if the prog
452 * changes context in a wrong way it will be caught.
453 */
454 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
455 BPF_CGROUP_INET4_BIND, &flags);
456 if (err)
457 return err;
458
459 return __inet_bind(sk, uaddr, addr_len, flags);
460}
461EXPORT_SYMBOL(inet_bind);
462
463int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
464 u32 flags)
465{
466 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
467 struct inet_sock *inet = inet_sk(sk);
468 struct net *net = sock_net(sk);
469 unsigned short snum;
470 int chk_addr_ret;
471 u32 tb_id = RT_TABLE_LOCAL;
472 int err;
473
474 if (addr->sin_family != AF_INET) {
475 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
476 * only if s_addr is INADDR_ANY.
477 */
478 err = -EAFNOSUPPORT;
479 if (addr->sin_family != AF_UNSPEC ||
480 addr->sin_addr.s_addr != htonl(INADDR_ANY))
481 goto out;
482 }
483
484 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
485 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
486
487 /* Not specified by any standard per-se, however it breaks too
488 * many applications when removed. It is unfortunate since
489 * allowing applications to make a non-local bind solves
490 * several problems with systems using dynamic addressing.
491 * (ie. your servers still start up even if your ISDN link
492 * is temporarily down)
493 */
494 err = -EADDRNOTAVAIL;
495 if (!inet_can_nonlocal_bind(net, inet) &&
496 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
497 chk_addr_ret != RTN_LOCAL &&
498 chk_addr_ret != RTN_MULTICAST &&
499 chk_addr_ret != RTN_BROADCAST)
500 goto out;
501
502 snum = ntohs(addr->sin_port);
503 err = -EACCES;
504 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
505 snum && inet_port_requires_bind_service(net, snum) &&
506 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
507 goto out;
508
509 /* We keep a pair of addresses. rcv_saddr is the one
510 * used by hash lookups, and saddr is used for transmit.
511 *
512 * In the BSD API these are the same except where it
513 * would be illegal to use them (multicast/broadcast) in
514 * which case the sending device address is used.
515 */
516 if (flags & BIND_WITH_LOCK)
517 lock_sock(sk);
518
519 /* Check these errors (active socket, double bind). */
520 err = -EINVAL;
521 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
522 goto out_release_sock;
523
524 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
525 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
526 inet->inet_saddr = 0; /* Use device */
527
528 /* Make sure we are allowed to bind here. */
529 if (snum || !(inet->bind_address_no_port ||
530 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
531 if (sk->sk_prot->get_port(sk, snum)) {
532 inet->inet_saddr = inet->inet_rcv_saddr = 0;
533 err = -EADDRINUSE;
534 goto out_release_sock;
535 }
536 if (!(flags & BIND_FROM_BPF)) {
537 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
538 if (err) {
539 inet->inet_saddr = inet->inet_rcv_saddr = 0;
540 goto out_release_sock;
541 }
542 }
543 }
544
545 if (inet->inet_rcv_saddr)
546 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
547 if (snum)
548 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
549 inet->inet_sport = htons(inet->inet_num);
550 inet->inet_daddr = 0;
551 inet->inet_dport = 0;
552 sk_dst_reset(sk);
553 err = 0;
554out_release_sock:
555 if (flags & BIND_WITH_LOCK)
556 release_sock(sk);
557out:
558 return err;
559}
560
561int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
562 int addr_len, int flags)
563{
564 struct sock *sk = sock->sk;
565 int err;
566
567 if (addr_len < sizeof(uaddr->sa_family))
568 return -EINVAL;
569 if (uaddr->sa_family == AF_UNSPEC)
570 return sk->sk_prot->disconnect(sk, flags);
571
572 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
573 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
574 if (err)
575 return err;
576 }
577
578 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
579 return -EAGAIN;
580 return sk->sk_prot->connect(sk, uaddr, addr_len);
581}
582EXPORT_SYMBOL(inet_dgram_connect);
583
584static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
585{
586 DEFINE_WAIT_FUNC(wait, woken_wake_function);
587
588 add_wait_queue(sk_sleep(sk), &wait);
589 sk->sk_write_pending += writebias;
590
591 /* Basic assumption: if someone sets sk->sk_err, he _must_
592 * change state of the socket from TCP_SYN_*.
593 * Connect() does not allow to get error notifications
594 * without closing the socket.
595 */
596 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
597 release_sock(sk);
598 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
599 lock_sock(sk);
600 if (signal_pending(current) || !timeo)
601 break;
602 }
603 remove_wait_queue(sk_sleep(sk), &wait);
604 sk->sk_write_pending -= writebias;
605 return timeo;
606}
607
608/*
609 * Connect to a remote host. There is regrettably still a little
610 * TCP 'magic' in here.
611 */
612int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
613 int addr_len, int flags, int is_sendmsg)
614{
615 struct sock *sk = sock->sk;
616 int err;
617 long timeo;
618
619 /*
620 * uaddr can be NULL and addr_len can be 0 if:
621 * sk is a TCP fastopen active socket and
622 * TCP_FASTOPEN_CONNECT sockopt is set and
623 * we already have a valid cookie for this socket.
624 * In this case, user can call write() after connect().
625 * write() will invoke tcp_sendmsg_fastopen() which calls
626 * __inet_stream_connect().
627 */
628 if (uaddr) {
629 if (addr_len < sizeof(uaddr->sa_family))
630 return -EINVAL;
631
632 if (uaddr->sa_family == AF_UNSPEC) {
633 err = sk->sk_prot->disconnect(sk, flags);
634 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
635 goto out;
636 }
637 }
638
639 switch (sock->state) {
640 default:
641 err = -EINVAL;
642 goto out;
643 case SS_CONNECTED:
644 err = -EISCONN;
645 goto out;
646 case SS_CONNECTING:
647 if (inet_sk(sk)->defer_connect)
648 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
649 else
650 err = -EALREADY;
651 /* Fall out of switch with err, set for this state */
652 break;
653 case SS_UNCONNECTED:
654 err = -EISCONN;
655 if (sk->sk_state != TCP_CLOSE)
656 goto out;
657
658 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
659 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
660 if (err)
661 goto out;
662 }
663
664 err = sk->sk_prot->connect(sk, uaddr, addr_len);
665 if (err < 0)
666 goto out;
667
668 sock->state = SS_CONNECTING;
669
670 if (!err && inet_sk(sk)->defer_connect)
671 goto out;
672
673 /* Just entered SS_CONNECTING state; the only
674 * difference is that return value in non-blocking
675 * case is EINPROGRESS, rather than EALREADY.
676 */
677 err = -EINPROGRESS;
678 break;
679 }
680
681 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
682
683 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
684 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
685 tcp_sk(sk)->fastopen_req &&
686 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
687
688 /* Error code is set above */
689 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
690 goto out;
691
692 err = sock_intr_errno(timeo);
693 if (signal_pending(current))
694 goto out;
695 }
696
697 /* Connection was closed by RST, timeout, ICMP error
698 * or another process disconnected us.
699 */
700 if (sk->sk_state == TCP_CLOSE)
701 goto sock_error;
702
703 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
704 * and error was received after socket entered established state.
705 * Hence, it is handled normally after connect() return successfully.
706 */
707
708 sock->state = SS_CONNECTED;
709 err = 0;
710out:
711 return err;
712
713sock_error:
714 err = sock_error(sk) ? : -ECONNABORTED;
715 sock->state = SS_UNCONNECTED;
716 if (sk->sk_prot->disconnect(sk, flags))
717 sock->state = SS_DISCONNECTING;
718 goto out;
719}
720EXPORT_SYMBOL(__inet_stream_connect);
721
722int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
723 int addr_len, int flags)
724{
725 int err;
726
727 lock_sock(sock->sk);
728 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
729 release_sock(sock->sk);
730 return err;
731}
732EXPORT_SYMBOL(inet_stream_connect);
733
734/*
735 * Accept a pending connection. The TCP layer now gives BSD semantics.
736 */
737
738int inet_accept(struct socket *sock, struct socket *newsock, int flags,
739 bool kern)
740{
741 struct sock *sk1 = sock->sk;
742 int err = -EINVAL;
743 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
744
745 if (!sk2)
746 goto do_err;
747
748 lock_sock(sk2);
749
750 sock_rps_record_flow(sk2);
751 WARN_ON(!((1 << sk2->sk_state) &
752 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
753 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
754
755 sock_graft(sk2, newsock);
756
757 newsock->state = SS_CONNECTED;
758 err = 0;
759 release_sock(sk2);
760do_err:
761 return err;
762}
763EXPORT_SYMBOL(inet_accept);
764
765/*
766 * This does both peername and sockname.
767 */
768int inet_getname(struct socket *sock, struct sockaddr *uaddr,
769 int peer)
770{
771 struct sock *sk = sock->sk;
772 struct inet_sock *inet = inet_sk(sk);
773 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
774
775 sin->sin_family = AF_INET;
776 if (peer) {
777 if (!inet->inet_dport ||
778 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
779 peer == 1))
780 return -ENOTCONN;
781 sin->sin_port = inet->inet_dport;
782 sin->sin_addr.s_addr = inet->inet_daddr;
783 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
784 BPF_CGROUP_INET4_GETPEERNAME,
785 NULL);
786 } else {
787 __be32 addr = inet->inet_rcv_saddr;
788 if (!addr)
789 addr = inet->inet_saddr;
790 sin->sin_port = inet->inet_sport;
791 sin->sin_addr.s_addr = addr;
792 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
793 BPF_CGROUP_INET4_GETSOCKNAME,
794 NULL);
795 }
796 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
797 return sizeof(*sin);
798}
799EXPORT_SYMBOL(inet_getname);
800
801int inet_send_prepare(struct sock *sk)
802{
803 sock_rps_record_flow(sk);
804
805 /* We may need to bind the socket. */
806 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
807 inet_autobind(sk))
808 return -EAGAIN;
809
810 return 0;
811}
812EXPORT_SYMBOL_GPL(inet_send_prepare);
813
814int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
815{
816 struct sock *sk = sock->sk;
817
818 if (unlikely(inet_send_prepare(sk)))
819 return -EAGAIN;
820
821 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
822 sk, msg, size);
823}
824EXPORT_SYMBOL(inet_sendmsg);
825
826ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
827 size_t size, int flags)
828{
829 struct sock *sk = sock->sk;
830
831 if (unlikely(inet_send_prepare(sk)))
832 return -EAGAIN;
833
834 if (sk->sk_prot->sendpage)
835 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
836 return sock_no_sendpage(sock, page, offset, size, flags);
837}
838EXPORT_SYMBOL(inet_sendpage);
839
840INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
841 size_t, int, int, int *));
842int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
843 int flags)
844{
845 struct sock *sk = sock->sk;
846 int addr_len = 0;
847 int err;
848
849 if (likely(!(flags & MSG_ERRQUEUE)))
850 sock_rps_record_flow(sk);
851
852 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
853 sk, msg, size, flags & MSG_DONTWAIT,
854 flags & ~MSG_DONTWAIT, &addr_len);
855 if (err >= 0)
856 msg->msg_namelen = addr_len;
857 return err;
858}
859EXPORT_SYMBOL(inet_recvmsg);
860
861int inet_shutdown(struct socket *sock, int how)
862{
863 struct sock *sk = sock->sk;
864 int err = 0;
865
866 /* This should really check to make sure
867 * the socket is a TCP socket. (WHY AC...)
868 */
869 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
870 1->2 bit 2 snds.
871 2->3 */
872 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
873 return -EINVAL;
874
875 lock_sock(sk);
876 if (sock->state == SS_CONNECTING) {
877 if ((1 << sk->sk_state) &
878 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
879 sock->state = SS_DISCONNECTING;
880 else
881 sock->state = SS_CONNECTED;
882 }
883
884 switch (sk->sk_state) {
885 case TCP_CLOSE:
886 err = -ENOTCONN;
887 /* Hack to wake up other listeners, who can poll for
888 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
889 fallthrough;
890 default:
891 sk->sk_shutdown |= how;
892 if (sk->sk_prot->shutdown)
893 sk->sk_prot->shutdown(sk, how);
894 break;
895
896 /* Remaining two branches are temporary solution for missing
897 * close() in multithreaded environment. It is _not_ a good idea,
898 * but we have no choice until close() is repaired at VFS level.
899 */
900 case TCP_LISTEN:
901 if (!(how & RCV_SHUTDOWN))
902 break;
903 fallthrough;
904 case TCP_SYN_SENT:
905 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
906 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
907 break;
908 }
909
910 /* Wake up anyone sleeping in poll. */
911 sk->sk_state_change(sk);
912 release_sock(sk);
913 return err;
914}
915EXPORT_SYMBOL(inet_shutdown);
916
917/*
918 * ioctl() calls you can issue on an INET socket. Most of these are
919 * device configuration and stuff and very rarely used. Some ioctls
920 * pass on to the socket itself.
921 *
922 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
923 * loads the devconfigure module does its configuring and unloads it.
924 * There's a good 20K of config code hanging around the kernel.
925 */
926
927int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
928{
929 struct sock *sk = sock->sk;
930 int err = 0;
931 struct net *net = sock_net(sk);
932 void __user *p = (void __user *)arg;
933 struct ifreq ifr;
934 struct rtentry rt;
935
936 switch (cmd) {
937 case SIOCADDRT:
938 case SIOCDELRT:
939 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
940 return -EFAULT;
941 err = ip_rt_ioctl(net, cmd, &rt);
942 break;
943 case SIOCRTMSG:
944 err = -EINVAL;
945 break;
946 case SIOCDARP:
947 case SIOCGARP:
948 case SIOCSARP:
949 err = arp_ioctl(net, cmd, (void __user *)arg);
950 break;
951 case SIOCGIFADDR:
952 case SIOCGIFBRDADDR:
953 case SIOCGIFNETMASK:
954 case SIOCGIFDSTADDR:
955 case SIOCGIFPFLAGS:
956 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
957 return -EFAULT;
958 err = devinet_ioctl(net, cmd, &ifr);
959 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
960 err = -EFAULT;
961 break;
962
963 case SIOCSIFADDR:
964 case SIOCSIFBRDADDR:
965 case SIOCSIFNETMASK:
966 case SIOCSIFDSTADDR:
967 case SIOCSIFPFLAGS:
968 case SIOCSIFFLAGS:
969 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
970 return -EFAULT;
971 err = devinet_ioctl(net, cmd, &ifr);
972 break;
973 default:
974 if (sk->sk_prot->ioctl)
975 err = sk->sk_prot->ioctl(sk, cmd, arg);
976 else
977 err = -ENOIOCTLCMD;
978 break;
979 }
980 return err;
981}
982EXPORT_SYMBOL(inet_ioctl);
983
984#ifdef CONFIG_COMPAT
985static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
986 struct compat_rtentry __user *ur)
987{
988 compat_uptr_t rtdev;
989 struct rtentry rt;
990
991 if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
992 3 * sizeof(struct sockaddr)) ||
993 get_user(rt.rt_flags, &ur->rt_flags) ||
994 get_user(rt.rt_metric, &ur->rt_metric) ||
995 get_user(rt.rt_mtu, &ur->rt_mtu) ||
996 get_user(rt.rt_window, &ur->rt_window) ||
997 get_user(rt.rt_irtt, &ur->rt_irtt) ||
998 get_user(rtdev, &ur->rt_dev))
999 return -EFAULT;
1000
1001 rt.rt_dev = compat_ptr(rtdev);
1002 return ip_rt_ioctl(sock_net(sk), cmd, &rt);
1003}
1004
1005static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1006{
1007 void __user *argp = compat_ptr(arg);
1008 struct sock *sk = sock->sk;
1009
1010 switch (cmd) {
1011 case SIOCADDRT:
1012 case SIOCDELRT:
1013 return inet_compat_routing_ioctl(sk, cmd, argp);
1014 default:
1015 if (!sk->sk_prot->compat_ioctl)
1016 return -ENOIOCTLCMD;
1017 return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1018 }
1019}
1020#endif /* CONFIG_COMPAT */
1021
1022const struct proto_ops inet_stream_ops = {
1023 .family = PF_INET,
1024 .owner = THIS_MODULE,
1025 .release = inet_release,
1026 .bind = inet_bind,
1027 .connect = inet_stream_connect,
1028 .socketpair = sock_no_socketpair,
1029 .accept = inet_accept,
1030 .getname = inet_getname,
1031 .poll = tcp_poll,
1032 .ioctl = inet_ioctl,
1033 .gettstamp = sock_gettstamp,
1034 .listen = inet_listen,
1035 .shutdown = inet_shutdown,
1036 .setsockopt = sock_common_setsockopt,
1037 .getsockopt = sock_common_getsockopt,
1038 .sendmsg = inet_sendmsg,
1039 .recvmsg = inet_recvmsg,
1040#ifdef CONFIG_MMU
1041 .mmap = tcp_mmap,
1042#endif
1043 .sendpage = inet_sendpage,
1044 .splice_read = tcp_splice_read,
1045 .read_sock = tcp_read_sock,
1046 .sendmsg_locked = tcp_sendmsg_locked,
1047 .sendpage_locked = tcp_sendpage_locked,
1048 .peek_len = tcp_peek_len,
1049#ifdef CONFIG_COMPAT
1050 .compat_ioctl = inet_compat_ioctl,
1051#endif
1052 .set_rcvlowat = tcp_set_rcvlowat,
1053};
1054EXPORT_SYMBOL(inet_stream_ops);
1055
1056const struct proto_ops inet_dgram_ops = {
1057 .family = PF_INET,
1058 .owner = THIS_MODULE,
1059 .release = inet_release,
1060 .bind = inet_bind,
1061 .connect = inet_dgram_connect,
1062 .socketpair = sock_no_socketpair,
1063 .accept = sock_no_accept,
1064 .getname = inet_getname,
1065 .poll = udp_poll,
1066 .ioctl = inet_ioctl,
1067 .gettstamp = sock_gettstamp,
1068 .listen = sock_no_listen,
1069 .shutdown = inet_shutdown,
1070 .setsockopt = sock_common_setsockopt,
1071 .getsockopt = sock_common_getsockopt,
1072 .sendmsg = inet_sendmsg,
1073 .read_sock = udp_read_sock,
1074 .recvmsg = inet_recvmsg,
1075 .mmap = sock_no_mmap,
1076 .sendpage = inet_sendpage,
1077 .set_peek_off = sk_set_peek_off,
1078#ifdef CONFIG_COMPAT
1079 .compat_ioctl = inet_compat_ioctl,
1080#endif
1081};
1082EXPORT_SYMBOL(inet_dgram_ops);
1083
1084/*
1085 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1086 * udp_poll
1087 */
1088static const struct proto_ops inet_sockraw_ops = {
1089 .family = PF_INET,
1090 .owner = THIS_MODULE,
1091 .release = inet_release,
1092 .bind = inet_bind,
1093 .connect = inet_dgram_connect,
1094 .socketpair = sock_no_socketpair,
1095 .accept = sock_no_accept,
1096 .getname = inet_getname,
1097 .poll = datagram_poll,
1098 .ioctl = inet_ioctl,
1099 .gettstamp = sock_gettstamp,
1100 .listen = sock_no_listen,
1101 .shutdown = inet_shutdown,
1102 .setsockopt = sock_common_setsockopt,
1103 .getsockopt = sock_common_getsockopt,
1104 .sendmsg = inet_sendmsg,
1105 .recvmsg = inet_recvmsg,
1106 .mmap = sock_no_mmap,
1107 .sendpage = inet_sendpage,
1108#ifdef CONFIG_COMPAT
1109 .compat_ioctl = inet_compat_ioctl,
1110#endif
1111};
1112
1113static const struct net_proto_family inet_family_ops = {
1114 .family = PF_INET,
1115 .create = inet_create,
1116 .owner = THIS_MODULE,
1117};
1118
1119/* Upon startup we insert all the elements in inetsw_array[] into
1120 * the linked list inetsw.
1121 */
1122static struct inet_protosw inetsw_array[] =
1123{
1124 {
1125 .type = SOCK_STREAM,
1126 .protocol = IPPROTO_TCP,
1127 .prot = &tcp_prot,
1128 .ops = &inet_stream_ops,
1129 .flags = INET_PROTOSW_PERMANENT |
1130 INET_PROTOSW_ICSK,
1131 },
1132
1133 {
1134 .type = SOCK_DGRAM,
1135 .protocol = IPPROTO_UDP,
1136 .prot = &udp_prot,
1137 .ops = &inet_dgram_ops,
1138 .flags = INET_PROTOSW_PERMANENT,
1139 },
1140
1141 {
1142 .type = SOCK_DGRAM,
1143 .protocol = IPPROTO_ICMP,
1144 .prot = &ping_prot,
1145 .ops = &inet_sockraw_ops,
1146 .flags = INET_PROTOSW_REUSE,
1147 },
1148
1149 {
1150 .type = SOCK_RAW,
1151 .protocol = IPPROTO_IP, /* wild card */
1152 .prot = &raw_prot,
1153 .ops = &inet_sockraw_ops,
1154 .flags = INET_PROTOSW_REUSE,
1155 }
1156};
1157
1158#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1159
1160void inet_register_protosw(struct inet_protosw *p)
1161{
1162 struct list_head *lh;
1163 struct inet_protosw *answer;
1164 int protocol = p->protocol;
1165 struct list_head *last_perm;
1166
1167 spin_lock_bh(&inetsw_lock);
1168
1169 if (p->type >= SOCK_MAX)
1170 goto out_illegal;
1171
1172 /* If we are trying to override a permanent protocol, bail. */
1173 last_perm = &inetsw[p->type];
1174 list_for_each(lh, &inetsw[p->type]) {
1175 answer = list_entry(lh, struct inet_protosw, list);
1176 /* Check only the non-wild match. */
1177 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1178 break;
1179 if (protocol == answer->protocol)
1180 goto out_permanent;
1181 last_perm = lh;
1182 }
1183
1184 /* Add the new entry after the last permanent entry if any, so that
1185 * the new entry does not override a permanent entry when matched with
1186 * a wild-card protocol. But it is allowed to override any existing
1187 * non-permanent entry. This means that when we remove this entry, the
1188 * system automatically returns to the old behavior.
1189 */
1190 list_add_rcu(&p->list, last_perm);
1191out:
1192 spin_unlock_bh(&inetsw_lock);
1193
1194 return;
1195
1196out_permanent:
1197 pr_err("Attempt to override permanent protocol %d\n", protocol);
1198 goto out;
1199
1200out_illegal:
1201 pr_err("Ignoring attempt to register invalid socket type %d\n",
1202 p->type);
1203 goto out;
1204}
1205EXPORT_SYMBOL(inet_register_protosw);
1206
1207void inet_unregister_protosw(struct inet_protosw *p)
1208{
1209 if (INET_PROTOSW_PERMANENT & p->flags) {
1210 pr_err("Attempt to unregister permanent protocol %d\n",
1211 p->protocol);
1212 } else {
1213 spin_lock_bh(&inetsw_lock);
1214 list_del_rcu(&p->list);
1215 spin_unlock_bh(&inetsw_lock);
1216
1217 synchronize_net();
1218 }
1219}
1220EXPORT_SYMBOL(inet_unregister_protosw);
1221
1222static int inet_sk_reselect_saddr(struct sock *sk)
1223{
1224 struct inet_sock *inet = inet_sk(sk);
1225 __be32 old_saddr = inet->inet_saddr;
1226 __be32 daddr = inet->inet_daddr;
1227 struct flowi4 *fl4;
1228 struct rtable *rt;
1229 __be32 new_saddr;
1230 struct ip_options_rcu *inet_opt;
1231
1232 inet_opt = rcu_dereference_protected(inet->inet_opt,
1233 lockdep_sock_is_held(sk));
1234 if (inet_opt && inet_opt->opt.srr)
1235 daddr = inet_opt->opt.faddr;
1236
1237 /* Query new route. */
1238 fl4 = &inet->cork.fl.u.ip4;
1239 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1240 sk->sk_bound_dev_if, sk->sk_protocol,
1241 inet->inet_sport, inet->inet_dport, sk);
1242 if (IS_ERR(rt))
1243 return PTR_ERR(rt);
1244
1245 sk_setup_caps(sk, &rt->dst);
1246
1247 new_saddr = fl4->saddr;
1248
1249 if (new_saddr == old_saddr)
1250 return 0;
1251
1252 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1253 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1254 __func__, &old_saddr, &new_saddr);
1255 }
1256
1257 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1258
1259 /*
1260 * XXX The only one ugly spot where we need to
1261 * XXX really change the sockets identity after
1262 * XXX it has entered the hashes. -DaveM
1263 *
1264 * Besides that, it does not check for connection
1265 * uniqueness. Wait for troubles.
1266 */
1267 return __sk_prot_rehash(sk);
1268}
1269
1270int inet_sk_rebuild_header(struct sock *sk)
1271{
1272 struct inet_sock *inet = inet_sk(sk);
1273 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1274 __be32 daddr;
1275 struct ip_options_rcu *inet_opt;
1276 struct flowi4 *fl4;
1277 int err;
1278
1279 /* Route is OK, nothing to do. */
1280 if (rt)
1281 return 0;
1282
1283 /* Reroute. */
1284 rcu_read_lock();
1285 inet_opt = rcu_dereference(inet->inet_opt);
1286 daddr = inet->inet_daddr;
1287 if (inet_opt && inet_opt->opt.srr)
1288 daddr = inet_opt->opt.faddr;
1289 rcu_read_unlock();
1290 fl4 = &inet->cork.fl.u.ip4;
1291 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1292 inet->inet_dport, inet->inet_sport,
1293 sk->sk_protocol, RT_CONN_FLAGS(sk),
1294 sk->sk_bound_dev_if);
1295 if (!IS_ERR(rt)) {
1296 err = 0;
1297 sk_setup_caps(sk, &rt->dst);
1298 } else {
1299 err = PTR_ERR(rt);
1300
1301 /* Routing failed... */
1302 sk->sk_route_caps = 0;
1303 /*
1304 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1305 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1306 */
1307 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1308 sk->sk_state != TCP_SYN_SENT ||
1309 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1310 (err = inet_sk_reselect_saddr(sk)) != 0)
1311 sk->sk_err_soft = -err;
1312 }
1313
1314 return err;
1315}
1316EXPORT_SYMBOL(inet_sk_rebuild_header);
1317
1318void inet_sk_set_state(struct sock *sk, int state)
1319{
1320 trace_inet_sock_set_state(sk, sk->sk_state, state);
1321 sk->sk_state = state;
1322}
1323EXPORT_SYMBOL(inet_sk_set_state);
1324
1325void inet_sk_state_store(struct sock *sk, int newstate)
1326{
1327 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1328 smp_store_release(&sk->sk_state, newstate);
1329}
1330
1331struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1332 netdev_features_t features)
1333{
1334 bool udpfrag = false, fixedid = false, gso_partial, encap;
1335 struct sk_buff *segs = ERR_PTR(-EINVAL);
1336 const struct net_offload *ops;
1337 unsigned int offset = 0;
1338 struct iphdr *iph;
1339 int proto, tot_len;
1340 int nhoff;
1341 int ihl;
1342 int id;
1343
1344 skb_reset_network_header(skb);
1345 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1346 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1347 goto out;
1348
1349 iph = ip_hdr(skb);
1350 ihl = iph->ihl * 4;
1351 if (ihl < sizeof(*iph))
1352 goto out;
1353
1354 id = ntohs(iph->id);
1355 proto = iph->protocol;
1356
1357 /* Warning: after this point, iph might be no longer valid */
1358 if (unlikely(!pskb_may_pull(skb, ihl)))
1359 goto out;
1360 __skb_pull(skb, ihl);
1361
1362 encap = SKB_GSO_CB(skb)->encap_level > 0;
1363 if (encap)
1364 features &= skb->dev->hw_enc_features;
1365 SKB_GSO_CB(skb)->encap_level += ihl;
1366
1367 skb_reset_transport_header(skb);
1368
1369 segs = ERR_PTR(-EPROTONOSUPPORT);
1370
1371 if (!skb->encapsulation || encap) {
1372 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1373 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1374
1375 /* fixed ID is invalid if DF bit is not set */
1376 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1377 goto out;
1378 }
1379
1380 ops = rcu_dereference(inet_offloads[proto]);
1381 if (likely(ops && ops->callbacks.gso_segment))
1382 segs = ops->callbacks.gso_segment(skb, features);
1383
1384 if (IS_ERR_OR_NULL(segs))
1385 goto out;
1386
1387 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1388
1389 skb = segs;
1390 do {
1391 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1392 if (udpfrag) {
1393 iph->frag_off = htons(offset >> 3);
1394 if (skb->next)
1395 iph->frag_off |= htons(IP_MF);
1396 offset += skb->len - nhoff - ihl;
1397 tot_len = skb->len - nhoff;
1398 } else if (skb_is_gso(skb)) {
1399 if (!fixedid) {
1400 iph->id = htons(id);
1401 id += skb_shinfo(skb)->gso_segs;
1402 }
1403
1404 if (gso_partial)
1405 tot_len = skb_shinfo(skb)->gso_size +
1406 SKB_GSO_CB(skb)->data_offset +
1407 skb->head - (unsigned char *)iph;
1408 else
1409 tot_len = skb->len - nhoff;
1410 } else {
1411 if (!fixedid)
1412 iph->id = htons(id++);
1413 tot_len = skb->len - nhoff;
1414 }
1415 iph->tot_len = htons(tot_len);
1416 ip_send_check(iph);
1417 if (encap)
1418 skb_reset_inner_headers(skb);
1419 skb->network_header = (u8 *)iph - skb->head;
1420 skb_reset_mac_len(skb);
1421 } while ((skb = skb->next));
1422
1423out:
1424 return segs;
1425}
1426
1427static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1428 netdev_features_t features)
1429{
1430 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1431 return ERR_PTR(-EINVAL);
1432
1433 return inet_gso_segment(skb, features);
1434}
1435
1436struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1437{
1438 const struct net_offload *ops;
1439 struct sk_buff *pp = NULL;
1440 const struct iphdr *iph;
1441 struct sk_buff *p;
1442 unsigned int hlen;
1443 unsigned int off;
1444 unsigned int id;
1445 int flush = 1;
1446 int proto;
1447
1448 off = skb_gro_offset(skb);
1449 hlen = off + sizeof(*iph);
1450 iph = skb_gro_header_fast(skb, off);
1451 if (skb_gro_header_hard(skb, hlen)) {
1452 iph = skb_gro_header_slow(skb, hlen, off);
1453 if (unlikely(!iph))
1454 goto out;
1455 }
1456
1457 proto = iph->protocol;
1458
1459 rcu_read_lock();
1460 ops = rcu_dereference(inet_offloads[proto]);
1461 if (!ops || !ops->callbacks.gro_receive)
1462 goto out_unlock;
1463
1464 if (*(u8 *)iph != 0x45)
1465 goto out_unlock;
1466
1467 if (ip_is_fragment(iph))
1468 goto out_unlock;
1469
1470 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1471 goto out_unlock;
1472
1473 id = ntohl(*(__be32 *)&iph->id);
1474 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1475 id >>= 16;
1476
1477 list_for_each_entry(p, head, list) {
1478 struct iphdr *iph2;
1479 u16 flush_id;
1480
1481 if (!NAPI_GRO_CB(p)->same_flow)
1482 continue;
1483
1484 iph2 = (struct iphdr *)(p->data + off);
1485 /* The above works because, with the exception of the top
1486 * (inner most) layer, we only aggregate pkts with the same
1487 * hdr length so all the hdrs we'll need to verify will start
1488 * at the same offset.
1489 */
1490 if ((iph->protocol ^ iph2->protocol) |
1491 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1492 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1493 NAPI_GRO_CB(p)->same_flow = 0;
1494 continue;
1495 }
1496
1497 /* All fields must match except length and checksum. */
1498 NAPI_GRO_CB(p)->flush |=
1499 (iph->ttl ^ iph2->ttl) |
1500 (iph->tos ^ iph2->tos) |
1501 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1502
1503 NAPI_GRO_CB(p)->flush |= flush;
1504
1505 /* We need to store of the IP ID check to be included later
1506 * when we can verify that this packet does in fact belong
1507 * to a given flow.
1508 */
1509 flush_id = (u16)(id - ntohs(iph2->id));
1510
1511 /* This bit of code makes it much easier for us to identify
1512 * the cases where we are doing atomic vs non-atomic IP ID
1513 * checks. Specifically an atomic check can return IP ID
1514 * values 0 - 0xFFFF, while a non-atomic check can only
1515 * return 0 or 0xFFFF.
1516 */
1517 if (!NAPI_GRO_CB(p)->is_atomic ||
1518 !(iph->frag_off & htons(IP_DF))) {
1519 flush_id ^= NAPI_GRO_CB(p)->count;
1520 flush_id = flush_id ? 0xFFFF : 0;
1521 }
1522
1523 /* If the previous IP ID value was based on an atomic
1524 * datagram we can overwrite the value and ignore it.
1525 */
1526 if (NAPI_GRO_CB(skb)->is_atomic)
1527 NAPI_GRO_CB(p)->flush_id = flush_id;
1528 else
1529 NAPI_GRO_CB(p)->flush_id |= flush_id;
1530 }
1531
1532 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1533 NAPI_GRO_CB(skb)->flush |= flush;
1534 skb_set_network_header(skb, off);
1535 /* The above will be needed by the transport layer if there is one
1536 * immediately following this IP hdr.
1537 */
1538
1539 /* Note : No need to call skb_gro_postpull_rcsum() here,
1540 * as we already checked checksum over ipv4 header was 0
1541 */
1542 skb_gro_pull(skb, sizeof(*iph));
1543 skb_set_transport_header(skb, skb_gro_offset(skb));
1544
1545 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1546 ops->callbacks.gro_receive, head, skb);
1547
1548out_unlock:
1549 rcu_read_unlock();
1550
1551out:
1552 skb_gro_flush_final(skb, pp, flush);
1553
1554 return pp;
1555}
1556
1557static struct sk_buff *ipip_gro_receive(struct list_head *head,
1558 struct sk_buff *skb)
1559{
1560 if (NAPI_GRO_CB(skb)->encap_mark) {
1561 NAPI_GRO_CB(skb)->flush = 1;
1562 return NULL;
1563 }
1564
1565 NAPI_GRO_CB(skb)->encap_mark = 1;
1566
1567 return inet_gro_receive(head, skb);
1568}
1569
1570#define SECONDS_PER_DAY 86400
1571
1572/* inet_current_timestamp - Return IP network timestamp
1573 *
1574 * Return milliseconds since midnight in network byte order.
1575 */
1576__be32 inet_current_timestamp(void)
1577{
1578 u32 secs;
1579 u32 msecs;
1580 struct timespec64 ts;
1581
1582 ktime_get_real_ts64(&ts);
1583
1584 /* Get secs since midnight. */
1585 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1586 /* Convert to msecs. */
1587 msecs = secs * MSEC_PER_SEC;
1588 /* Convert nsec to msec. */
1589 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1590
1591 /* Convert to network byte order. */
1592 return htonl(msecs);
1593}
1594EXPORT_SYMBOL(inet_current_timestamp);
1595
1596int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1597{
1598 if (sk->sk_family == AF_INET)
1599 return ip_recv_error(sk, msg, len, addr_len);
1600#if IS_ENABLED(CONFIG_IPV6)
1601 if (sk->sk_family == AF_INET6)
1602 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1603#endif
1604 return -EINVAL;
1605}
1606
1607int inet_gro_complete(struct sk_buff *skb, int nhoff)
1608{
1609 __be16 newlen = htons(skb->len - nhoff);
1610 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1611 const struct net_offload *ops;
1612 int proto = iph->protocol;
1613 int err = -ENOSYS;
1614
1615 if (skb->encapsulation) {
1616 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1617 skb_set_inner_network_header(skb, nhoff);
1618 }
1619
1620 csum_replace2(&iph->check, iph->tot_len, newlen);
1621 iph->tot_len = newlen;
1622
1623 rcu_read_lock();
1624 ops = rcu_dereference(inet_offloads[proto]);
1625 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1626 goto out_unlock;
1627
1628 /* Only need to add sizeof(*iph) to get to the next hdr below
1629 * because any hdr with option will have been flushed in
1630 * inet_gro_receive().
1631 */
1632 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1633 tcp4_gro_complete, udp4_gro_complete,
1634 skb, nhoff + sizeof(*iph));
1635
1636out_unlock:
1637 rcu_read_unlock();
1638
1639 return err;
1640}
1641
1642static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1643{
1644 skb->encapsulation = 1;
1645 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1646 return inet_gro_complete(skb, nhoff);
1647}
1648
1649int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1650 unsigned short type, unsigned char protocol,
1651 struct net *net)
1652{
1653 struct socket *sock;
1654 int rc = sock_create_kern(net, family, type, protocol, &sock);
1655
1656 if (rc == 0) {
1657 *sk = sock->sk;
1658 (*sk)->sk_allocation = GFP_ATOMIC;
1659 /*
1660 * Unhash it so that IP input processing does not even see it,
1661 * we do not wish this socket to see incoming packets.
1662 */
1663 (*sk)->sk_prot->unhash(*sk);
1664 }
1665 return rc;
1666}
1667EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1668
1669u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1670{
1671 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1672}
1673EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1674
1675unsigned long snmp_fold_field(void __percpu *mib, int offt)
1676{
1677 unsigned long res = 0;
1678 int i;
1679
1680 for_each_possible_cpu(i)
1681 res += snmp_get_cpu_field(mib, i, offt);
1682 return res;
1683}
1684EXPORT_SYMBOL_GPL(snmp_fold_field);
1685
1686#if BITS_PER_LONG==32
1687
1688u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1689 size_t syncp_offset)
1690{
1691 void *bhptr;
1692 struct u64_stats_sync *syncp;
1693 u64 v;
1694 unsigned int start;
1695
1696 bhptr = per_cpu_ptr(mib, cpu);
1697 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1698 do {
1699 start = u64_stats_fetch_begin_irq(syncp);
1700 v = *(((u64 *)bhptr) + offt);
1701 } while (u64_stats_fetch_retry_irq(syncp, start));
1702
1703 return v;
1704}
1705EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1706
1707u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1708{
1709 u64 res = 0;
1710 int cpu;
1711
1712 for_each_possible_cpu(cpu) {
1713 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1714 }
1715 return res;
1716}
1717EXPORT_SYMBOL_GPL(snmp_fold_field64);
1718#endif
1719
1720#ifdef CONFIG_IP_MULTICAST
1721static const struct net_protocol igmp_protocol = {
1722 .handler = igmp_rcv,
1723};
1724#endif
1725
1726/* thinking of making this const? Don't.
1727 * early_demux can change based on sysctl.
1728 */
1729static struct net_protocol tcp_protocol = {
1730 .early_demux = tcp_v4_early_demux,
1731 .early_demux_handler = tcp_v4_early_demux,
1732 .handler = tcp_v4_rcv,
1733 .err_handler = tcp_v4_err,
1734 .no_policy = 1,
1735 .icmp_strict_tag_validation = 1,
1736};
1737
1738/* thinking of making this const? Don't.
1739 * early_demux can change based on sysctl.
1740 */
1741static struct net_protocol udp_protocol = {
1742 .early_demux = udp_v4_early_demux,
1743 .early_demux_handler = udp_v4_early_demux,
1744 .handler = udp_rcv,
1745 .err_handler = udp_err,
1746 .no_policy = 1,
1747};
1748
1749static const struct net_protocol icmp_protocol = {
1750 .handler = icmp_rcv,
1751 .err_handler = icmp_err,
1752 .no_policy = 1,
1753};
1754
1755static __net_init int ipv4_mib_init_net(struct net *net)
1756{
1757 int i;
1758
1759 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1760 if (!net->mib.tcp_statistics)
1761 goto err_tcp_mib;
1762 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1763 if (!net->mib.ip_statistics)
1764 goto err_ip_mib;
1765
1766 for_each_possible_cpu(i) {
1767 struct ipstats_mib *af_inet_stats;
1768 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1769 u64_stats_init(&af_inet_stats->syncp);
1770 }
1771
1772 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1773 if (!net->mib.net_statistics)
1774 goto err_net_mib;
1775 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1776 if (!net->mib.udp_statistics)
1777 goto err_udp_mib;
1778 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1779 if (!net->mib.udplite_statistics)
1780 goto err_udplite_mib;
1781 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1782 if (!net->mib.icmp_statistics)
1783 goto err_icmp_mib;
1784 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1785 GFP_KERNEL);
1786 if (!net->mib.icmpmsg_statistics)
1787 goto err_icmpmsg_mib;
1788
1789 tcp_mib_init(net);
1790 return 0;
1791
1792err_icmpmsg_mib:
1793 free_percpu(net->mib.icmp_statistics);
1794err_icmp_mib:
1795 free_percpu(net->mib.udplite_statistics);
1796err_udplite_mib:
1797 free_percpu(net->mib.udp_statistics);
1798err_udp_mib:
1799 free_percpu(net->mib.net_statistics);
1800err_net_mib:
1801 free_percpu(net->mib.ip_statistics);
1802err_ip_mib:
1803 free_percpu(net->mib.tcp_statistics);
1804err_tcp_mib:
1805 return -ENOMEM;
1806}
1807
1808static __net_exit void ipv4_mib_exit_net(struct net *net)
1809{
1810 kfree(net->mib.icmpmsg_statistics);
1811 free_percpu(net->mib.icmp_statistics);
1812 free_percpu(net->mib.udplite_statistics);
1813 free_percpu(net->mib.udp_statistics);
1814 free_percpu(net->mib.net_statistics);
1815 free_percpu(net->mib.ip_statistics);
1816 free_percpu(net->mib.tcp_statistics);
1817#ifdef CONFIG_MPTCP
1818 /* allocated on demand, see mptcp_init_sock() */
1819 free_percpu(net->mib.mptcp_statistics);
1820#endif
1821}
1822
1823static __net_initdata struct pernet_operations ipv4_mib_ops = {
1824 .init = ipv4_mib_init_net,
1825 .exit = ipv4_mib_exit_net,
1826};
1827
1828static int __init init_ipv4_mibs(void)
1829{
1830 return register_pernet_subsys(&ipv4_mib_ops);
1831}
1832
1833static __net_init int inet_init_net(struct net *net)
1834{
1835 /*
1836 * Set defaults for local port range
1837 */
1838 seqlock_init(&net->ipv4.ip_local_ports.lock);
1839 net->ipv4.ip_local_ports.range[0] = 32768;
1840 net->ipv4.ip_local_ports.range[1] = 60999;
1841
1842 seqlock_init(&net->ipv4.ping_group_range.lock);
1843 /*
1844 * Sane defaults - nobody may create ping sockets.
1845 * Boot scripts should set this to distro-specific group.
1846 */
1847 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1848 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1849
1850 /* Default values for sysctl-controlled parameters.
1851 * We set them here, in case sysctl is not compiled.
1852 */
1853 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1854 net->ipv4.sysctl_ip_fwd_update_priority = 1;
1855 net->ipv4.sysctl_ip_dynaddr = 0;
1856 net->ipv4.sysctl_ip_early_demux = 1;
1857 net->ipv4.sysctl_udp_early_demux = 1;
1858 net->ipv4.sysctl_tcp_early_demux = 1;
1859 net->ipv4.sysctl_nexthop_compat_mode = 1;
1860#ifdef CONFIG_SYSCTL
1861 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1862#endif
1863
1864 /* Some igmp sysctl, whose values are always used */
1865 net->ipv4.sysctl_igmp_max_memberships = 20;
1866 net->ipv4.sysctl_igmp_max_msf = 10;
1867 /* IGMP reports for link-local multicast groups are enabled by default */
1868 net->ipv4.sysctl_igmp_llm_reports = 1;
1869 net->ipv4.sysctl_igmp_qrv = 2;
1870
1871 net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1872
1873 return 0;
1874}
1875
1876static __net_initdata struct pernet_operations af_inet_ops = {
1877 .init = inet_init_net,
1878};
1879
1880static int __init init_inet_pernet_ops(void)
1881{
1882 return register_pernet_subsys(&af_inet_ops);
1883}
1884
1885static int ipv4_proc_init(void);
1886
1887/*
1888 * IP protocol layer initialiser
1889 */
1890
1891static struct packet_offload ip_packet_offload __read_mostly = {
1892 .type = cpu_to_be16(ETH_P_IP),
1893 .callbacks = {
1894 .gso_segment = inet_gso_segment,
1895 .gro_receive = inet_gro_receive,
1896 .gro_complete = inet_gro_complete,
1897 },
1898};
1899
1900static const struct net_offload ipip_offload = {
1901 .callbacks = {
1902 .gso_segment = ipip_gso_segment,
1903 .gro_receive = ipip_gro_receive,
1904 .gro_complete = ipip_gro_complete,
1905 },
1906};
1907
1908static int __init ipip_offload_init(void)
1909{
1910 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1911}
1912
1913static int __init ipv4_offload_init(void)
1914{
1915 /*
1916 * Add offloads
1917 */
1918 if (udpv4_offload_init() < 0)
1919 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1920 if (tcpv4_offload_init() < 0)
1921 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1922 if (ipip_offload_init() < 0)
1923 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1924
1925 dev_add_offload(&ip_packet_offload);
1926 return 0;
1927}
1928
1929fs_initcall(ipv4_offload_init);
1930
1931static struct packet_type ip_packet_type __read_mostly = {
1932 .type = cpu_to_be16(ETH_P_IP),
1933 .func = ip_rcv,
1934 .list_func = ip_list_rcv,
1935};
1936
1937static int __init inet_init(void)
1938{
1939 struct inet_protosw *q;
1940 struct list_head *r;
1941 int rc;
1942
1943 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1944
1945 rc = proto_register(&tcp_prot, 1);
1946 if (rc)
1947 goto out;
1948
1949 rc = proto_register(&udp_prot, 1);
1950 if (rc)
1951 goto out_unregister_tcp_proto;
1952
1953 rc = proto_register(&raw_prot, 1);
1954 if (rc)
1955 goto out_unregister_udp_proto;
1956
1957 rc = proto_register(&ping_prot, 1);
1958 if (rc)
1959 goto out_unregister_raw_proto;
1960
1961 /*
1962 * Tell SOCKET that we are alive...
1963 */
1964
1965 (void)sock_register(&inet_family_ops);
1966
1967#ifdef CONFIG_SYSCTL
1968 ip_static_sysctl_init();
1969#endif
1970
1971 /*
1972 * Add all the base protocols.
1973 */
1974
1975 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1976 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1977 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1978 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1979 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1980 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1981#ifdef CONFIG_IP_MULTICAST
1982 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1983 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1984#endif
1985
1986 /* Register the socket-side information for inet_create. */
1987 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1988 INIT_LIST_HEAD(r);
1989
1990 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1991 inet_register_protosw(q);
1992
1993 /*
1994 * Set the ARP module up
1995 */
1996
1997 arp_init();
1998
1999 /*
2000 * Set the IP module up
2001 */
2002
2003 ip_init();
2004
2005 /* Setup TCP slab cache for open requests. */
2006 tcp_init();
2007
2008 /* Setup UDP memory threshold */
2009 udp_init();
2010
2011 /* Add UDP-Lite (RFC 3828) */
2012 udplite4_register();
2013
2014 raw_init();
2015
2016 ping_init();
2017
2018 /*
2019 * Set the ICMP layer up
2020 */
2021
2022 if (icmp_init() < 0)
2023 panic("Failed to create the ICMP control socket.\n");
2024
2025 /*
2026 * Initialise the multicast router
2027 */
2028#if defined(CONFIG_IP_MROUTE)
2029 if (ip_mr_init())
2030 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2031#endif
2032
2033 if (init_inet_pernet_ops())
2034 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2035 /*
2036 * Initialise per-cpu ipv4 mibs
2037 */
2038
2039 if (init_ipv4_mibs())
2040 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
2041
2042 ipv4_proc_init();
2043
2044 ipfrag_init();
2045
2046 dev_add_pack(&ip_packet_type);
2047
2048 ip_tunnel_core_init();
2049
2050 rc = 0;
2051out:
2052 return rc;
2053out_unregister_raw_proto:
2054 proto_unregister(&raw_prot);
2055out_unregister_udp_proto:
2056 proto_unregister(&udp_prot);
2057out_unregister_tcp_proto:
2058 proto_unregister(&tcp_prot);
2059 goto out;
2060}
2061
2062fs_initcall(inet_init);
2063
2064/* ------------------------------------------------------------------------ */
2065
2066#ifdef CONFIG_PROC_FS
2067static int __init ipv4_proc_init(void)
2068{
2069 int rc = 0;
2070
2071 if (raw_proc_init())
2072 goto out_raw;
2073 if (tcp4_proc_init())
2074 goto out_tcp;
2075 if (udp4_proc_init())
2076 goto out_udp;
2077 if (ping_proc_init())
2078 goto out_ping;
2079 if (ip_misc_proc_init())
2080 goto out_misc;
2081out:
2082 return rc;
2083out_misc:
2084 ping_proc_exit();
2085out_ping:
2086 udp4_proc_exit();
2087out_udp:
2088 tcp4_proc_exit();
2089out_tcp:
2090 raw_proc_exit();
2091out_raw:
2092 rc = -ENOMEM;
2093 goto out;
2094}
2095
2096#else /* CONFIG_PROC_FS */
2097static int __init ipv4_proc_init(void)
2098{
2099 return 0;
2100}
2101#endif /* CONFIG_PROC_FS */
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * PF_INET protocol family socket handler.
8 *
9 * Authors: Ross Biro
10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 * Florian La Roche, <flla@stud.uni-sb.de>
12 * Alan Cox, <A.Cox@swansea.ac.uk>
13 *
14 * Changes (see also sock.c)
15 *
16 * piggy,
17 * Karl Knutson : Socket protocol table
18 * A.N.Kuznetsov : Socket death error in accept().
19 * John Richardson : Fix non blocking error in connect()
20 * so sockets that fail to connect
21 * don't return -EINPROGRESS.
22 * Alan Cox : Asynchronous I/O support
23 * Alan Cox : Keep correct socket pointer on sock
24 * structures
25 * when accept() ed
26 * Alan Cox : Semantics of SO_LINGER aren't state
27 * moved to close when you look carefully.
28 * With this fixed and the accept bug fixed
29 * some RPC stuff seems happier.
30 * Niibe Yutaka : 4.4BSD style write async I/O
31 * Alan Cox,
32 * Tony Gale : Fixed reuse semantics.
33 * Alan Cox : bind() shouldn't abort existing but dead
34 * sockets. Stops FTP netin:.. I hope.
35 * Alan Cox : bind() works correctly for RAW sockets.
36 * Note that FreeBSD at least was broken
37 * in this respect so be careful with
38 * compatibility tests...
39 * Alan Cox : routing cache support
40 * Alan Cox : memzero the socket structure for
41 * compactness.
42 * Matt Day : nonblock connect error handler
43 * Alan Cox : Allow large numbers of pending sockets
44 * (eg for big web sites), but only if
45 * specifically application requested.
46 * Alan Cox : New buffering throughout IP. Used
47 * dumbly.
48 * Alan Cox : New buffering now used smartly.
49 * Alan Cox : BSD rather than common sense
50 * interpretation of listen.
51 * Germano Caronni : Assorted small races.
52 * Alan Cox : sendmsg/recvmsg basic support.
53 * Alan Cox : Only sendmsg/recvmsg now supported.
54 * Alan Cox : Locked down bind (see security list).
55 * Alan Cox : Loosened bind a little.
56 * Mike McLagan : ADD/DEL DLCI Ioctls
57 * Willy Konynenberg : Transparent proxying support.
58 * David S. Miller : New socket lookup architecture.
59 * Some other random speedups.
60 * Cyrus Durgin : Cleaned up file for kmod hacks.
61 * Andi Kleen : Fix inet_stream_connect TCP race.
62 */
63
64#define pr_fmt(fmt) "IPv4: " fmt
65
66#include <linux/err.h>
67#include <linux/errno.h>
68#include <linux/types.h>
69#include <linux/socket.h>
70#include <linux/in.h>
71#include <linux/kernel.h>
72#include <linux/kmod.h>
73#include <linux/sched.h>
74#include <linux/timer.h>
75#include <linux/string.h>
76#include <linux/sockios.h>
77#include <linux/net.h>
78#include <linux/capability.h>
79#include <linux/fcntl.h>
80#include <linux/mm.h>
81#include <linux/interrupt.h>
82#include <linux/stat.h>
83#include <linux/init.h>
84#include <linux/poll.h>
85#include <linux/netfilter_ipv4.h>
86#include <linux/random.h>
87#include <linux/slab.h>
88
89#include <linux/uaccess.h>
90
91#include <linux/inet.h>
92#include <linux/igmp.h>
93#include <linux/inetdevice.h>
94#include <linux/netdevice.h>
95#include <net/checksum.h>
96#include <net/ip.h>
97#include <net/protocol.h>
98#include <net/arp.h>
99#include <net/route.h>
100#include <net/ip_fib.h>
101#include <net/inet_connection_sock.h>
102#include <net/gro.h>
103#include <net/gso.h>
104#include <net/tcp.h>
105#include <net/udp.h>
106#include <net/udplite.h>
107#include <net/ping.h>
108#include <linux/skbuff.h>
109#include <net/sock.h>
110#include <net/raw.h>
111#include <net/icmp.h>
112#include <net/inet_common.h>
113#include <net/ip_tunnels.h>
114#include <net/xfrm.h>
115#include <net/net_namespace.h>
116#include <net/secure_seq.h>
117#ifdef CONFIG_IP_MROUTE
118#include <linux/mroute.h>
119#endif
120#include <net/l3mdev.h>
121#include <net/compat.h>
122#include <net/rps.h>
123
124#include <trace/events/sock.h>
125
126/* The inetsw table contains everything that inet_create needs to
127 * build a new socket.
128 */
129static struct list_head inetsw[SOCK_MAX];
130static DEFINE_SPINLOCK(inetsw_lock);
131
132/* New destruction routine */
133
134void inet_sock_destruct(struct sock *sk)
135{
136 struct inet_sock *inet = inet_sk(sk);
137
138 __skb_queue_purge(&sk->sk_receive_queue);
139 __skb_queue_purge(&sk->sk_error_queue);
140
141 sk_mem_reclaim_final(sk);
142
143 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
144 pr_err("Attempt to release TCP socket in state %d %p\n",
145 sk->sk_state, sk);
146 return;
147 }
148 if (!sock_flag(sk, SOCK_DEAD)) {
149 pr_err("Attempt to release alive inet socket %p\n", sk);
150 return;
151 }
152
153 WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc));
154 WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc));
155 WARN_ON_ONCE(sk->sk_wmem_queued);
156 WARN_ON_ONCE(sk_forward_alloc_get(sk));
157
158 kfree(rcu_dereference_protected(inet->inet_opt, 1));
159 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
160 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1));
161}
162EXPORT_SYMBOL(inet_sock_destruct);
163
164/*
165 * The routines beyond this point handle the behaviour of an AF_INET
166 * socket object. Mostly it punts to the subprotocols of IP to do
167 * the work.
168 */
169
170/*
171 * Automatically bind an unbound socket.
172 */
173
174static int inet_autobind(struct sock *sk)
175{
176 struct inet_sock *inet;
177 /* We may need to bind the socket. */
178 lock_sock(sk);
179 inet = inet_sk(sk);
180 if (!inet->inet_num) {
181 if (sk->sk_prot->get_port(sk, 0)) {
182 release_sock(sk);
183 return -EAGAIN;
184 }
185 inet->inet_sport = htons(inet->inet_num);
186 }
187 release_sock(sk);
188 return 0;
189}
190
191int __inet_listen_sk(struct sock *sk, int backlog)
192{
193 unsigned char old_state = sk->sk_state;
194 int err, tcp_fastopen;
195
196 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
197 return -EINVAL;
198
199 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
200 /* Really, if the socket is already in listen state
201 * we can only allow the backlog to be adjusted.
202 */
203 if (old_state != TCP_LISTEN) {
204 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
205 * Note that only TCP sockets (SOCK_STREAM) will reach here.
206 * Also fastopen backlog may already been set via the option
207 * because the socket was in TCP_LISTEN state previously but
208 * was shutdown() rather than close().
209 */
210 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen);
211 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
212 (tcp_fastopen & TFO_SERVER_ENABLE) &&
213 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
214 fastopen_queue_tune(sk, backlog);
215 tcp_fastopen_init_key_once(sock_net(sk));
216 }
217
218 err = inet_csk_listen_start(sk);
219 if (err)
220 return err;
221
222 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
223 }
224 return 0;
225}
226
227/*
228 * Move a socket into listening state.
229 */
230int inet_listen(struct socket *sock, int backlog)
231{
232 struct sock *sk = sock->sk;
233 int err = -EINVAL;
234
235 lock_sock(sk);
236
237 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
238 goto out;
239
240 err = __inet_listen_sk(sk, backlog);
241
242out:
243 release_sock(sk);
244 return err;
245}
246EXPORT_SYMBOL(inet_listen);
247
248/*
249 * Create an inet socket.
250 */
251
252static int inet_create(struct net *net, struct socket *sock, int protocol,
253 int kern)
254{
255 struct sock *sk;
256 struct inet_protosw *answer;
257 struct inet_sock *inet;
258 struct proto *answer_prot;
259 unsigned char answer_flags;
260 int try_loading_module = 0;
261 int err;
262
263 if (protocol < 0 || protocol >= IPPROTO_MAX)
264 return -EINVAL;
265
266 sock->state = SS_UNCONNECTED;
267
268 /* Look for the requested type/protocol pair. */
269lookup_protocol:
270 err = -ESOCKTNOSUPPORT;
271 rcu_read_lock();
272 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
273
274 err = 0;
275 /* Check the non-wild match. */
276 if (protocol == answer->protocol) {
277 if (protocol != IPPROTO_IP)
278 break;
279 } else {
280 /* Check for the two wild cases. */
281 if (IPPROTO_IP == protocol) {
282 protocol = answer->protocol;
283 break;
284 }
285 if (IPPROTO_IP == answer->protocol)
286 break;
287 }
288 err = -EPROTONOSUPPORT;
289 }
290
291 if (unlikely(err)) {
292 if (try_loading_module < 2) {
293 rcu_read_unlock();
294 /*
295 * Be more specific, e.g. net-pf-2-proto-132-type-1
296 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
297 */
298 if (++try_loading_module == 1)
299 request_module("net-pf-%d-proto-%d-type-%d",
300 PF_INET, protocol, sock->type);
301 /*
302 * Fall back to generic, e.g. net-pf-2-proto-132
303 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
304 */
305 else
306 request_module("net-pf-%d-proto-%d",
307 PF_INET, protocol);
308 goto lookup_protocol;
309 } else
310 goto out_rcu_unlock;
311 }
312
313 err = -EPERM;
314 if (sock->type == SOCK_RAW && !kern &&
315 !ns_capable(net->user_ns, CAP_NET_RAW))
316 goto out_rcu_unlock;
317
318 sock->ops = answer->ops;
319 answer_prot = answer->prot;
320 answer_flags = answer->flags;
321 rcu_read_unlock();
322
323 WARN_ON(!answer_prot->slab);
324
325 err = -ENOMEM;
326 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
327 if (!sk)
328 goto out;
329
330 err = 0;
331 if (INET_PROTOSW_REUSE & answer_flags)
332 sk->sk_reuse = SK_CAN_REUSE;
333
334 if (INET_PROTOSW_ICSK & answer_flags)
335 inet_init_csk_locks(sk);
336
337 inet = inet_sk(sk);
338 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
339
340 inet_clear_bit(NODEFRAG, sk);
341
342 if (SOCK_RAW == sock->type) {
343 inet->inet_num = protocol;
344 if (IPPROTO_RAW == protocol)
345 inet_set_bit(HDRINCL, sk);
346 }
347
348 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
349 inet->pmtudisc = IP_PMTUDISC_DONT;
350 else
351 inet->pmtudisc = IP_PMTUDISC_WANT;
352
353 atomic_set(&inet->inet_id, 0);
354
355 sock_init_data(sock, sk);
356
357 sk->sk_destruct = inet_sock_destruct;
358 sk->sk_protocol = protocol;
359 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
360 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
361
362 inet->uc_ttl = -1;
363 inet_set_bit(MC_LOOP, sk);
364 inet->mc_ttl = 1;
365 inet_set_bit(MC_ALL, sk);
366 inet->mc_index = 0;
367 inet->mc_list = NULL;
368 inet->rcv_tos = 0;
369
370 if (inet->inet_num) {
371 /* It assumes that any protocol which allows
372 * the user to assign a number at socket
373 * creation time automatically
374 * shares.
375 */
376 inet->inet_sport = htons(inet->inet_num);
377 /* Add to protocol hash chains. */
378 err = sk->sk_prot->hash(sk);
379 if (err) {
380 sk_common_release(sk);
381 goto out;
382 }
383 }
384
385 if (sk->sk_prot->init) {
386 err = sk->sk_prot->init(sk);
387 if (err) {
388 sk_common_release(sk);
389 goto out;
390 }
391 }
392
393 if (!kern) {
394 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
395 if (err) {
396 sk_common_release(sk);
397 goto out;
398 }
399 }
400out:
401 return err;
402out_rcu_unlock:
403 rcu_read_unlock();
404 goto out;
405}
406
407
408/*
409 * The peer socket should always be NULL (or else). When we call this
410 * function we are destroying the object and from then on nobody
411 * should refer to it.
412 */
413int inet_release(struct socket *sock)
414{
415 struct sock *sk = sock->sk;
416
417 if (sk) {
418 long timeout;
419
420 if (!sk->sk_kern_sock)
421 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
422
423 /* Applications forget to leave groups before exiting */
424 ip_mc_drop_socket(sk);
425
426 /* If linger is set, we don't return until the close
427 * is complete. Otherwise we return immediately. The
428 * actually closing is done the same either way.
429 *
430 * If the close is due to the process exiting, we never
431 * linger..
432 */
433 timeout = 0;
434 if (sock_flag(sk, SOCK_LINGER) &&
435 !(current->flags & PF_EXITING))
436 timeout = sk->sk_lingertime;
437 sk->sk_prot->close(sk, timeout);
438 sock->sk = NULL;
439 }
440 return 0;
441}
442EXPORT_SYMBOL(inet_release);
443
444int inet_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
445{
446 u32 flags = BIND_WITH_LOCK;
447 int err;
448
449 /* If the socket has its own bind function then use it. (RAW) */
450 if (sk->sk_prot->bind) {
451 return sk->sk_prot->bind(sk, uaddr, addr_len);
452 }
453 if (addr_len < sizeof(struct sockaddr_in))
454 return -EINVAL;
455
456 /* BPF prog is run before any checks are done so that if the prog
457 * changes context in a wrong way it will be caught.
458 */
459 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
460 CGROUP_INET4_BIND, &flags);
461 if (err)
462 return err;
463
464 return __inet_bind(sk, uaddr, addr_len, flags);
465}
466
467int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
468{
469 return inet_bind_sk(sock->sk, uaddr, addr_len);
470}
471EXPORT_SYMBOL(inet_bind);
472
473int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
474 u32 flags)
475{
476 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
477 struct inet_sock *inet = inet_sk(sk);
478 struct net *net = sock_net(sk);
479 unsigned short snum;
480 int chk_addr_ret;
481 u32 tb_id = RT_TABLE_LOCAL;
482 int err;
483
484 if (addr->sin_family != AF_INET) {
485 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
486 * only if s_addr is INADDR_ANY.
487 */
488 err = -EAFNOSUPPORT;
489 if (addr->sin_family != AF_UNSPEC ||
490 addr->sin_addr.s_addr != htonl(INADDR_ANY))
491 goto out;
492 }
493
494 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
495 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
496
497 /* Not specified by any standard per-se, however it breaks too
498 * many applications when removed. It is unfortunate since
499 * allowing applications to make a non-local bind solves
500 * several problems with systems using dynamic addressing.
501 * (ie. your servers still start up even if your ISDN link
502 * is temporarily down)
503 */
504 err = -EADDRNOTAVAIL;
505 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
506 chk_addr_ret))
507 goto out;
508
509 snum = ntohs(addr->sin_port);
510 err = -EACCES;
511 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
512 snum && inet_port_requires_bind_service(net, snum) &&
513 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
514 goto out;
515
516 /* We keep a pair of addresses. rcv_saddr is the one
517 * used by hash lookups, and saddr is used for transmit.
518 *
519 * In the BSD API these are the same except where it
520 * would be illegal to use them (multicast/broadcast) in
521 * which case the sending device address is used.
522 */
523 if (flags & BIND_WITH_LOCK)
524 lock_sock(sk);
525
526 /* Check these errors (active socket, double bind). */
527 err = -EINVAL;
528 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
529 goto out_release_sock;
530
531 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
532 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
533 inet->inet_saddr = 0; /* Use device */
534
535 /* Make sure we are allowed to bind here. */
536 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
537 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
538 err = sk->sk_prot->get_port(sk, snum);
539 if (err) {
540 inet->inet_saddr = inet->inet_rcv_saddr = 0;
541 goto out_release_sock;
542 }
543 if (!(flags & BIND_FROM_BPF)) {
544 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
545 if (err) {
546 inet->inet_saddr = inet->inet_rcv_saddr = 0;
547 if (sk->sk_prot->put_port)
548 sk->sk_prot->put_port(sk);
549 goto out_release_sock;
550 }
551 }
552 }
553
554 if (inet->inet_rcv_saddr)
555 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
556 if (snum)
557 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
558 inet->inet_sport = htons(inet->inet_num);
559 inet->inet_daddr = 0;
560 inet->inet_dport = 0;
561 sk_dst_reset(sk);
562 err = 0;
563out_release_sock:
564 if (flags & BIND_WITH_LOCK)
565 release_sock(sk);
566out:
567 return err;
568}
569
570int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
571 int addr_len, int flags)
572{
573 struct sock *sk = sock->sk;
574 const struct proto *prot;
575 int err;
576
577 if (addr_len < sizeof(uaddr->sa_family))
578 return -EINVAL;
579
580 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
581 prot = READ_ONCE(sk->sk_prot);
582
583 if (uaddr->sa_family == AF_UNSPEC)
584 return prot->disconnect(sk, flags);
585
586 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
587 err = prot->pre_connect(sk, uaddr, addr_len);
588 if (err)
589 return err;
590 }
591
592 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
593 return -EAGAIN;
594 return prot->connect(sk, uaddr, addr_len);
595}
596EXPORT_SYMBOL(inet_dgram_connect);
597
598static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
599{
600 DEFINE_WAIT_FUNC(wait, woken_wake_function);
601
602 add_wait_queue(sk_sleep(sk), &wait);
603 sk->sk_write_pending += writebias;
604
605 /* Basic assumption: if someone sets sk->sk_err, he _must_
606 * change state of the socket from TCP_SYN_*.
607 * Connect() does not allow to get error notifications
608 * without closing the socket.
609 */
610 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
611 release_sock(sk);
612 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
613 lock_sock(sk);
614 if (signal_pending(current) || !timeo)
615 break;
616 }
617 remove_wait_queue(sk_sleep(sk), &wait);
618 sk->sk_write_pending -= writebias;
619 return timeo;
620}
621
622/*
623 * Connect to a remote host. There is regrettably still a little
624 * TCP 'magic' in here.
625 */
626int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
627 int addr_len, int flags, int is_sendmsg)
628{
629 struct sock *sk = sock->sk;
630 int err;
631 long timeo;
632
633 /*
634 * uaddr can be NULL and addr_len can be 0 if:
635 * sk is a TCP fastopen active socket and
636 * TCP_FASTOPEN_CONNECT sockopt is set and
637 * we already have a valid cookie for this socket.
638 * In this case, user can call write() after connect().
639 * write() will invoke tcp_sendmsg_fastopen() which calls
640 * __inet_stream_connect().
641 */
642 if (uaddr) {
643 if (addr_len < sizeof(uaddr->sa_family))
644 return -EINVAL;
645
646 if (uaddr->sa_family == AF_UNSPEC) {
647 sk->sk_disconnects++;
648 err = sk->sk_prot->disconnect(sk, flags);
649 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
650 goto out;
651 }
652 }
653
654 switch (sock->state) {
655 default:
656 err = -EINVAL;
657 goto out;
658 case SS_CONNECTED:
659 err = -EISCONN;
660 goto out;
661 case SS_CONNECTING:
662 if (inet_test_bit(DEFER_CONNECT, sk))
663 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
664 else
665 err = -EALREADY;
666 /* Fall out of switch with err, set for this state */
667 break;
668 case SS_UNCONNECTED:
669 err = -EISCONN;
670 if (sk->sk_state != TCP_CLOSE)
671 goto out;
672
673 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
674 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
675 if (err)
676 goto out;
677 }
678
679 err = sk->sk_prot->connect(sk, uaddr, addr_len);
680 if (err < 0)
681 goto out;
682
683 sock->state = SS_CONNECTING;
684
685 if (!err && inet_test_bit(DEFER_CONNECT, sk))
686 goto out;
687
688 /* Just entered SS_CONNECTING state; the only
689 * difference is that return value in non-blocking
690 * case is EINPROGRESS, rather than EALREADY.
691 */
692 err = -EINPROGRESS;
693 break;
694 }
695
696 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
697
698 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
699 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
700 tcp_sk(sk)->fastopen_req &&
701 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
702 int dis = sk->sk_disconnects;
703
704 /* Error code is set above */
705 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
706 goto out;
707
708 err = sock_intr_errno(timeo);
709 if (signal_pending(current))
710 goto out;
711
712 if (dis != sk->sk_disconnects) {
713 err = -EPIPE;
714 goto out;
715 }
716 }
717
718 /* Connection was closed by RST, timeout, ICMP error
719 * or another process disconnected us.
720 */
721 if (sk->sk_state == TCP_CLOSE)
722 goto sock_error;
723
724 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
725 * and error was received after socket entered established state.
726 * Hence, it is handled normally after connect() return successfully.
727 */
728
729 sock->state = SS_CONNECTED;
730 err = 0;
731out:
732 return err;
733
734sock_error:
735 err = sock_error(sk) ? : -ECONNABORTED;
736 sock->state = SS_UNCONNECTED;
737 sk->sk_disconnects++;
738 if (sk->sk_prot->disconnect(sk, flags))
739 sock->state = SS_DISCONNECTING;
740 goto out;
741}
742EXPORT_SYMBOL(__inet_stream_connect);
743
744int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
745 int addr_len, int flags)
746{
747 int err;
748
749 lock_sock(sock->sk);
750 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
751 release_sock(sock->sk);
752 return err;
753}
754EXPORT_SYMBOL(inet_stream_connect);
755
756void __inet_accept(struct socket *sock, struct socket *newsock, struct sock *newsk)
757{
758 sock_rps_record_flow(newsk);
759 WARN_ON(!((1 << newsk->sk_state) &
760 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
761 TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 |
762 TCPF_CLOSING | TCPF_CLOSE_WAIT |
763 TCPF_CLOSE)));
764
765 if (test_bit(SOCK_SUPPORT_ZC, &sock->flags))
766 set_bit(SOCK_SUPPORT_ZC, &newsock->flags);
767 sock_graft(newsk, newsock);
768
769 newsock->state = SS_CONNECTED;
770}
771
772/*
773 * Accept a pending connection. The TCP layer now gives BSD semantics.
774 */
775
776int inet_accept(struct socket *sock, struct socket *newsock, int flags,
777 bool kern)
778{
779 struct sock *sk1 = sock->sk, *sk2;
780 int err = -EINVAL;
781
782 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
783 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, flags, &err, kern);
784 if (!sk2)
785 return err;
786
787 lock_sock(sk2);
788 __inet_accept(sock, newsock, sk2);
789 release_sock(sk2);
790 return 0;
791}
792EXPORT_SYMBOL(inet_accept);
793
794/*
795 * This does both peername and sockname.
796 */
797int inet_getname(struct socket *sock, struct sockaddr *uaddr,
798 int peer)
799{
800 struct sock *sk = sock->sk;
801 struct inet_sock *inet = inet_sk(sk);
802 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
803 int sin_addr_len = sizeof(*sin);
804
805 sin->sin_family = AF_INET;
806 lock_sock(sk);
807 if (peer) {
808 if (!inet->inet_dport ||
809 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
810 peer == 1)) {
811 release_sock(sk);
812 return -ENOTCONN;
813 }
814 sin->sin_port = inet->inet_dport;
815 sin->sin_addr.s_addr = inet->inet_daddr;
816 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
817 CGROUP_INET4_GETPEERNAME);
818 } else {
819 __be32 addr = inet->inet_rcv_saddr;
820 if (!addr)
821 addr = inet->inet_saddr;
822 sin->sin_port = inet->inet_sport;
823 sin->sin_addr.s_addr = addr;
824 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
825 CGROUP_INET4_GETSOCKNAME);
826 }
827 release_sock(sk);
828 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
829 return sin_addr_len;
830}
831EXPORT_SYMBOL(inet_getname);
832
833int inet_send_prepare(struct sock *sk)
834{
835 sock_rps_record_flow(sk);
836
837 /* We may need to bind the socket. */
838 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
839 inet_autobind(sk))
840 return -EAGAIN;
841
842 return 0;
843}
844EXPORT_SYMBOL_GPL(inet_send_prepare);
845
846int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
847{
848 struct sock *sk = sock->sk;
849
850 if (unlikely(inet_send_prepare(sk)))
851 return -EAGAIN;
852
853 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
854 sk, msg, size);
855}
856EXPORT_SYMBOL(inet_sendmsg);
857
858void inet_splice_eof(struct socket *sock)
859{
860 const struct proto *prot;
861 struct sock *sk = sock->sk;
862
863 if (unlikely(inet_send_prepare(sk)))
864 return;
865
866 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
867 prot = READ_ONCE(sk->sk_prot);
868 if (prot->splice_eof)
869 prot->splice_eof(sock);
870}
871EXPORT_SYMBOL_GPL(inet_splice_eof);
872
873INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
874 size_t, int, int *));
875int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
876 int flags)
877{
878 struct sock *sk = sock->sk;
879 int addr_len = 0;
880 int err;
881
882 if (likely(!(flags & MSG_ERRQUEUE)))
883 sock_rps_record_flow(sk);
884
885 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
886 sk, msg, size, flags, &addr_len);
887 if (err >= 0)
888 msg->msg_namelen = addr_len;
889 return err;
890}
891EXPORT_SYMBOL(inet_recvmsg);
892
893int inet_shutdown(struct socket *sock, int how)
894{
895 struct sock *sk = sock->sk;
896 int err = 0;
897
898 /* This should really check to make sure
899 * the socket is a TCP socket. (WHY AC...)
900 */
901 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
902 1->2 bit 2 snds.
903 2->3 */
904 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
905 return -EINVAL;
906
907 lock_sock(sk);
908 if (sock->state == SS_CONNECTING) {
909 if ((1 << sk->sk_state) &
910 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
911 sock->state = SS_DISCONNECTING;
912 else
913 sock->state = SS_CONNECTED;
914 }
915
916 switch (sk->sk_state) {
917 case TCP_CLOSE:
918 err = -ENOTCONN;
919 /* Hack to wake up other listeners, who can poll for
920 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
921 fallthrough;
922 default:
923 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how);
924 if (sk->sk_prot->shutdown)
925 sk->sk_prot->shutdown(sk, how);
926 break;
927
928 /* Remaining two branches are temporary solution for missing
929 * close() in multithreaded environment. It is _not_ a good idea,
930 * but we have no choice until close() is repaired at VFS level.
931 */
932 case TCP_LISTEN:
933 if (!(how & RCV_SHUTDOWN))
934 break;
935 fallthrough;
936 case TCP_SYN_SENT:
937 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
938 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
939 break;
940 }
941
942 /* Wake up anyone sleeping in poll. */
943 sk->sk_state_change(sk);
944 release_sock(sk);
945 return err;
946}
947EXPORT_SYMBOL(inet_shutdown);
948
949/*
950 * ioctl() calls you can issue on an INET socket. Most of these are
951 * device configuration and stuff and very rarely used. Some ioctls
952 * pass on to the socket itself.
953 *
954 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
955 * loads the devconfigure module does its configuring and unloads it.
956 * There's a good 20K of config code hanging around the kernel.
957 */
958
959int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
960{
961 struct sock *sk = sock->sk;
962 int err = 0;
963 struct net *net = sock_net(sk);
964 void __user *p = (void __user *)arg;
965 struct ifreq ifr;
966 struct rtentry rt;
967
968 switch (cmd) {
969 case SIOCADDRT:
970 case SIOCDELRT:
971 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
972 return -EFAULT;
973 err = ip_rt_ioctl(net, cmd, &rt);
974 break;
975 case SIOCRTMSG:
976 err = -EINVAL;
977 break;
978 case SIOCDARP:
979 case SIOCGARP:
980 case SIOCSARP:
981 err = arp_ioctl(net, cmd, (void __user *)arg);
982 break;
983 case SIOCGIFADDR:
984 case SIOCGIFBRDADDR:
985 case SIOCGIFNETMASK:
986 case SIOCGIFDSTADDR:
987 case SIOCGIFPFLAGS:
988 if (get_user_ifreq(&ifr, NULL, p))
989 return -EFAULT;
990 err = devinet_ioctl(net, cmd, &ifr);
991 if (!err && put_user_ifreq(&ifr, p))
992 err = -EFAULT;
993 break;
994
995 case SIOCSIFADDR:
996 case SIOCSIFBRDADDR:
997 case SIOCSIFNETMASK:
998 case SIOCSIFDSTADDR:
999 case SIOCSIFPFLAGS:
1000 case SIOCSIFFLAGS:
1001 if (get_user_ifreq(&ifr, NULL, p))
1002 return -EFAULT;
1003 err = devinet_ioctl(net, cmd, &ifr);
1004 break;
1005 default:
1006 if (sk->sk_prot->ioctl)
1007 err = sk_ioctl(sk, cmd, (void __user *)arg);
1008 else
1009 err = -ENOIOCTLCMD;
1010 break;
1011 }
1012 return err;
1013}
1014EXPORT_SYMBOL(inet_ioctl);
1015
1016#ifdef CONFIG_COMPAT
1017static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
1018 struct compat_rtentry __user *ur)
1019{
1020 compat_uptr_t rtdev;
1021 struct rtentry rt;
1022
1023 if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
1024 3 * sizeof(struct sockaddr)) ||
1025 get_user(rt.rt_flags, &ur->rt_flags) ||
1026 get_user(rt.rt_metric, &ur->rt_metric) ||
1027 get_user(rt.rt_mtu, &ur->rt_mtu) ||
1028 get_user(rt.rt_window, &ur->rt_window) ||
1029 get_user(rt.rt_irtt, &ur->rt_irtt) ||
1030 get_user(rtdev, &ur->rt_dev))
1031 return -EFAULT;
1032
1033 rt.rt_dev = compat_ptr(rtdev);
1034 return ip_rt_ioctl(sock_net(sk), cmd, &rt);
1035}
1036
1037static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1038{
1039 void __user *argp = compat_ptr(arg);
1040 struct sock *sk = sock->sk;
1041
1042 switch (cmd) {
1043 case SIOCADDRT:
1044 case SIOCDELRT:
1045 return inet_compat_routing_ioctl(sk, cmd, argp);
1046 default:
1047 if (!sk->sk_prot->compat_ioctl)
1048 return -ENOIOCTLCMD;
1049 return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1050 }
1051}
1052#endif /* CONFIG_COMPAT */
1053
1054const struct proto_ops inet_stream_ops = {
1055 .family = PF_INET,
1056 .owner = THIS_MODULE,
1057 .release = inet_release,
1058 .bind = inet_bind,
1059 .connect = inet_stream_connect,
1060 .socketpair = sock_no_socketpair,
1061 .accept = inet_accept,
1062 .getname = inet_getname,
1063 .poll = tcp_poll,
1064 .ioctl = inet_ioctl,
1065 .gettstamp = sock_gettstamp,
1066 .listen = inet_listen,
1067 .shutdown = inet_shutdown,
1068 .setsockopt = sock_common_setsockopt,
1069 .getsockopt = sock_common_getsockopt,
1070 .sendmsg = inet_sendmsg,
1071 .recvmsg = inet_recvmsg,
1072#ifdef CONFIG_MMU
1073 .mmap = tcp_mmap,
1074#endif
1075 .splice_eof = inet_splice_eof,
1076 .splice_read = tcp_splice_read,
1077 .read_sock = tcp_read_sock,
1078 .read_skb = tcp_read_skb,
1079 .sendmsg_locked = tcp_sendmsg_locked,
1080 .peek_len = tcp_peek_len,
1081#ifdef CONFIG_COMPAT
1082 .compat_ioctl = inet_compat_ioctl,
1083#endif
1084 .set_rcvlowat = tcp_set_rcvlowat,
1085};
1086EXPORT_SYMBOL(inet_stream_ops);
1087
1088const struct proto_ops inet_dgram_ops = {
1089 .family = PF_INET,
1090 .owner = THIS_MODULE,
1091 .release = inet_release,
1092 .bind = inet_bind,
1093 .connect = inet_dgram_connect,
1094 .socketpair = sock_no_socketpair,
1095 .accept = sock_no_accept,
1096 .getname = inet_getname,
1097 .poll = udp_poll,
1098 .ioctl = inet_ioctl,
1099 .gettstamp = sock_gettstamp,
1100 .listen = sock_no_listen,
1101 .shutdown = inet_shutdown,
1102 .setsockopt = sock_common_setsockopt,
1103 .getsockopt = sock_common_getsockopt,
1104 .sendmsg = inet_sendmsg,
1105 .read_skb = udp_read_skb,
1106 .recvmsg = inet_recvmsg,
1107 .mmap = sock_no_mmap,
1108 .splice_eof = inet_splice_eof,
1109 .set_peek_off = udp_set_peek_off,
1110#ifdef CONFIG_COMPAT
1111 .compat_ioctl = inet_compat_ioctl,
1112#endif
1113};
1114EXPORT_SYMBOL(inet_dgram_ops);
1115
1116/*
1117 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1118 * udp_poll
1119 */
1120static const struct proto_ops inet_sockraw_ops = {
1121 .family = PF_INET,
1122 .owner = THIS_MODULE,
1123 .release = inet_release,
1124 .bind = inet_bind,
1125 .connect = inet_dgram_connect,
1126 .socketpair = sock_no_socketpair,
1127 .accept = sock_no_accept,
1128 .getname = inet_getname,
1129 .poll = datagram_poll,
1130 .ioctl = inet_ioctl,
1131 .gettstamp = sock_gettstamp,
1132 .listen = sock_no_listen,
1133 .shutdown = inet_shutdown,
1134 .setsockopt = sock_common_setsockopt,
1135 .getsockopt = sock_common_getsockopt,
1136 .sendmsg = inet_sendmsg,
1137 .recvmsg = inet_recvmsg,
1138 .mmap = sock_no_mmap,
1139 .splice_eof = inet_splice_eof,
1140#ifdef CONFIG_COMPAT
1141 .compat_ioctl = inet_compat_ioctl,
1142#endif
1143};
1144
1145static const struct net_proto_family inet_family_ops = {
1146 .family = PF_INET,
1147 .create = inet_create,
1148 .owner = THIS_MODULE,
1149};
1150
1151/* Upon startup we insert all the elements in inetsw_array[] into
1152 * the linked list inetsw.
1153 */
1154static struct inet_protosw inetsw_array[] =
1155{
1156 {
1157 .type = SOCK_STREAM,
1158 .protocol = IPPROTO_TCP,
1159 .prot = &tcp_prot,
1160 .ops = &inet_stream_ops,
1161 .flags = INET_PROTOSW_PERMANENT |
1162 INET_PROTOSW_ICSK,
1163 },
1164
1165 {
1166 .type = SOCK_DGRAM,
1167 .protocol = IPPROTO_UDP,
1168 .prot = &udp_prot,
1169 .ops = &inet_dgram_ops,
1170 .flags = INET_PROTOSW_PERMANENT,
1171 },
1172
1173 {
1174 .type = SOCK_DGRAM,
1175 .protocol = IPPROTO_ICMP,
1176 .prot = &ping_prot,
1177 .ops = &inet_sockraw_ops,
1178 .flags = INET_PROTOSW_REUSE,
1179 },
1180
1181 {
1182 .type = SOCK_RAW,
1183 .protocol = IPPROTO_IP, /* wild card */
1184 .prot = &raw_prot,
1185 .ops = &inet_sockraw_ops,
1186 .flags = INET_PROTOSW_REUSE,
1187 }
1188};
1189
1190#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1191
1192void inet_register_protosw(struct inet_protosw *p)
1193{
1194 struct list_head *lh;
1195 struct inet_protosw *answer;
1196 int protocol = p->protocol;
1197 struct list_head *last_perm;
1198
1199 spin_lock_bh(&inetsw_lock);
1200
1201 if (p->type >= SOCK_MAX)
1202 goto out_illegal;
1203
1204 /* If we are trying to override a permanent protocol, bail. */
1205 last_perm = &inetsw[p->type];
1206 list_for_each(lh, &inetsw[p->type]) {
1207 answer = list_entry(lh, struct inet_protosw, list);
1208 /* Check only the non-wild match. */
1209 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1210 break;
1211 if (protocol == answer->protocol)
1212 goto out_permanent;
1213 last_perm = lh;
1214 }
1215
1216 /* Add the new entry after the last permanent entry if any, so that
1217 * the new entry does not override a permanent entry when matched with
1218 * a wild-card protocol. But it is allowed to override any existing
1219 * non-permanent entry. This means that when we remove this entry, the
1220 * system automatically returns to the old behavior.
1221 */
1222 list_add_rcu(&p->list, last_perm);
1223out:
1224 spin_unlock_bh(&inetsw_lock);
1225
1226 return;
1227
1228out_permanent:
1229 pr_err("Attempt to override permanent protocol %d\n", protocol);
1230 goto out;
1231
1232out_illegal:
1233 pr_err("Ignoring attempt to register invalid socket type %d\n",
1234 p->type);
1235 goto out;
1236}
1237EXPORT_SYMBOL(inet_register_protosw);
1238
1239void inet_unregister_protosw(struct inet_protosw *p)
1240{
1241 if (INET_PROTOSW_PERMANENT & p->flags) {
1242 pr_err("Attempt to unregister permanent protocol %d\n",
1243 p->protocol);
1244 } else {
1245 spin_lock_bh(&inetsw_lock);
1246 list_del_rcu(&p->list);
1247 spin_unlock_bh(&inetsw_lock);
1248
1249 synchronize_net();
1250 }
1251}
1252EXPORT_SYMBOL(inet_unregister_protosw);
1253
1254static int inet_sk_reselect_saddr(struct sock *sk)
1255{
1256 struct inet_sock *inet = inet_sk(sk);
1257 __be32 old_saddr = inet->inet_saddr;
1258 __be32 daddr = inet->inet_daddr;
1259 struct flowi4 *fl4;
1260 struct rtable *rt;
1261 __be32 new_saddr;
1262 struct ip_options_rcu *inet_opt;
1263 int err;
1264
1265 inet_opt = rcu_dereference_protected(inet->inet_opt,
1266 lockdep_sock_is_held(sk));
1267 if (inet_opt && inet_opt->opt.srr)
1268 daddr = inet_opt->opt.faddr;
1269
1270 /* Query new route. */
1271 fl4 = &inet->cork.fl.u.ip4;
1272 rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if,
1273 sk->sk_protocol, inet->inet_sport,
1274 inet->inet_dport, sk);
1275 if (IS_ERR(rt))
1276 return PTR_ERR(rt);
1277
1278 new_saddr = fl4->saddr;
1279
1280 if (new_saddr == old_saddr) {
1281 sk_setup_caps(sk, &rt->dst);
1282 return 0;
1283 }
1284
1285 err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET);
1286 if (err) {
1287 ip_rt_put(rt);
1288 return err;
1289 }
1290
1291 sk_setup_caps(sk, &rt->dst);
1292
1293 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1294 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1295 __func__, &old_saddr, &new_saddr);
1296 }
1297
1298 /*
1299 * XXX The only one ugly spot where we need to
1300 * XXX really change the sockets identity after
1301 * XXX it has entered the hashes. -DaveM
1302 *
1303 * Besides that, it does not check for connection
1304 * uniqueness. Wait for troubles.
1305 */
1306 return __sk_prot_rehash(sk);
1307}
1308
1309int inet_sk_rebuild_header(struct sock *sk)
1310{
1311 struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0));
1312 struct inet_sock *inet = inet_sk(sk);
1313 __be32 daddr;
1314 struct ip_options_rcu *inet_opt;
1315 struct flowi4 *fl4;
1316 int err;
1317
1318 /* Route is OK, nothing to do. */
1319 if (rt)
1320 return 0;
1321
1322 /* Reroute. */
1323 rcu_read_lock();
1324 inet_opt = rcu_dereference(inet->inet_opt);
1325 daddr = inet->inet_daddr;
1326 if (inet_opt && inet_opt->opt.srr)
1327 daddr = inet_opt->opt.faddr;
1328 rcu_read_unlock();
1329 fl4 = &inet->cork.fl.u.ip4;
1330 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1331 inet->inet_dport, inet->inet_sport,
1332 sk->sk_protocol, ip_sock_rt_tos(sk),
1333 sk->sk_bound_dev_if);
1334 if (!IS_ERR(rt)) {
1335 err = 0;
1336 sk_setup_caps(sk, &rt->dst);
1337 } else {
1338 err = PTR_ERR(rt);
1339
1340 /* Routing failed... */
1341 sk->sk_route_caps = 0;
1342 /*
1343 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1344 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1345 */
1346 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1347 sk->sk_state != TCP_SYN_SENT ||
1348 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1349 (err = inet_sk_reselect_saddr(sk)) != 0)
1350 WRITE_ONCE(sk->sk_err_soft, -err);
1351 }
1352
1353 return err;
1354}
1355EXPORT_SYMBOL(inet_sk_rebuild_header);
1356
1357void inet_sk_set_state(struct sock *sk, int state)
1358{
1359 trace_inet_sock_set_state(sk, sk->sk_state, state);
1360 sk->sk_state = state;
1361}
1362EXPORT_SYMBOL(inet_sk_set_state);
1363
1364void inet_sk_state_store(struct sock *sk, int newstate)
1365{
1366 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1367 smp_store_release(&sk->sk_state, newstate);
1368}
1369
1370struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1371 netdev_features_t features)
1372{
1373 bool udpfrag = false, fixedid = false, gso_partial, encap;
1374 struct sk_buff *segs = ERR_PTR(-EINVAL);
1375 const struct net_offload *ops;
1376 unsigned int offset = 0;
1377 struct iphdr *iph;
1378 int proto, tot_len;
1379 int nhoff;
1380 int ihl;
1381 int id;
1382
1383 skb_reset_network_header(skb);
1384 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1385 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1386 goto out;
1387
1388 iph = ip_hdr(skb);
1389 ihl = iph->ihl * 4;
1390 if (ihl < sizeof(*iph))
1391 goto out;
1392
1393 id = ntohs(iph->id);
1394 proto = iph->protocol;
1395
1396 /* Warning: after this point, iph might be no longer valid */
1397 if (unlikely(!pskb_may_pull(skb, ihl)))
1398 goto out;
1399 __skb_pull(skb, ihl);
1400
1401 encap = SKB_GSO_CB(skb)->encap_level > 0;
1402 if (encap)
1403 features &= skb->dev->hw_enc_features;
1404 SKB_GSO_CB(skb)->encap_level += ihl;
1405
1406 skb_reset_transport_header(skb);
1407
1408 segs = ERR_PTR(-EPROTONOSUPPORT);
1409
1410 if (!skb->encapsulation || encap) {
1411 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1412 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1413
1414 /* fixed ID is invalid if DF bit is not set */
1415 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1416 goto out;
1417 }
1418
1419 ops = rcu_dereference(inet_offloads[proto]);
1420 if (likely(ops && ops->callbacks.gso_segment)) {
1421 segs = ops->callbacks.gso_segment(skb, features);
1422 if (!segs)
1423 skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1424 }
1425
1426 if (IS_ERR_OR_NULL(segs))
1427 goto out;
1428
1429 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1430
1431 skb = segs;
1432 do {
1433 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1434 if (udpfrag) {
1435 iph->frag_off = htons(offset >> 3);
1436 if (skb->next)
1437 iph->frag_off |= htons(IP_MF);
1438 offset += skb->len - nhoff - ihl;
1439 tot_len = skb->len - nhoff;
1440 } else if (skb_is_gso(skb)) {
1441 if (!fixedid) {
1442 iph->id = htons(id);
1443 id += skb_shinfo(skb)->gso_segs;
1444 }
1445
1446 if (gso_partial)
1447 tot_len = skb_shinfo(skb)->gso_size +
1448 SKB_GSO_CB(skb)->data_offset +
1449 skb->head - (unsigned char *)iph;
1450 else
1451 tot_len = skb->len - nhoff;
1452 } else {
1453 if (!fixedid)
1454 iph->id = htons(id++);
1455 tot_len = skb->len - nhoff;
1456 }
1457 iph->tot_len = htons(tot_len);
1458 ip_send_check(iph);
1459 if (encap)
1460 skb_reset_inner_headers(skb);
1461 skb->network_header = (u8 *)iph - skb->head;
1462 skb_reset_mac_len(skb);
1463 } while ((skb = skb->next));
1464
1465out:
1466 return segs;
1467}
1468
1469static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1470 netdev_features_t features)
1471{
1472 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1473 return ERR_PTR(-EINVAL);
1474
1475 return inet_gso_segment(skb, features);
1476}
1477
1478struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1479{
1480 const struct net_offload *ops;
1481 struct sk_buff *pp = NULL;
1482 const struct iphdr *iph;
1483 struct sk_buff *p;
1484 unsigned int hlen;
1485 unsigned int off;
1486 unsigned int id;
1487 int flush = 1;
1488 int proto;
1489
1490 off = skb_gro_offset(skb);
1491 hlen = off + sizeof(*iph);
1492 iph = skb_gro_header(skb, hlen, off);
1493 if (unlikely(!iph))
1494 goto out;
1495
1496 proto = iph->protocol;
1497
1498 ops = rcu_dereference(inet_offloads[proto]);
1499 if (!ops || !ops->callbacks.gro_receive)
1500 goto out;
1501
1502 if (*(u8 *)iph != 0x45)
1503 goto out;
1504
1505 if (ip_is_fragment(iph))
1506 goto out;
1507
1508 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1509 goto out;
1510
1511 NAPI_GRO_CB(skb)->proto = proto;
1512 id = ntohl(*(__be32 *)&iph->id);
1513 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1514 id >>= 16;
1515
1516 list_for_each_entry(p, head, list) {
1517 struct iphdr *iph2;
1518 u16 flush_id;
1519
1520 if (!NAPI_GRO_CB(p)->same_flow)
1521 continue;
1522
1523 iph2 = (struct iphdr *)(p->data + off);
1524 /* The above works because, with the exception of the top
1525 * (inner most) layer, we only aggregate pkts with the same
1526 * hdr length so all the hdrs we'll need to verify will start
1527 * at the same offset.
1528 */
1529 if ((iph->protocol ^ iph2->protocol) |
1530 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1531 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1532 NAPI_GRO_CB(p)->same_flow = 0;
1533 continue;
1534 }
1535
1536 /* All fields must match except length and checksum. */
1537 NAPI_GRO_CB(p)->flush |=
1538 (iph->ttl ^ iph2->ttl) |
1539 (iph->tos ^ iph2->tos) |
1540 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1541
1542 NAPI_GRO_CB(p)->flush |= flush;
1543
1544 /* We need to store of the IP ID check to be included later
1545 * when we can verify that this packet does in fact belong
1546 * to a given flow.
1547 */
1548 flush_id = (u16)(id - ntohs(iph2->id));
1549
1550 /* This bit of code makes it much easier for us to identify
1551 * the cases where we are doing atomic vs non-atomic IP ID
1552 * checks. Specifically an atomic check can return IP ID
1553 * values 0 - 0xFFFF, while a non-atomic check can only
1554 * return 0 or 0xFFFF.
1555 */
1556 if (!NAPI_GRO_CB(p)->is_atomic ||
1557 !(iph->frag_off & htons(IP_DF))) {
1558 flush_id ^= NAPI_GRO_CB(p)->count;
1559 flush_id = flush_id ? 0xFFFF : 0;
1560 }
1561
1562 /* If the previous IP ID value was based on an atomic
1563 * datagram we can overwrite the value and ignore it.
1564 */
1565 if (NAPI_GRO_CB(skb)->is_atomic)
1566 NAPI_GRO_CB(p)->flush_id = flush_id;
1567 else
1568 NAPI_GRO_CB(p)->flush_id |= flush_id;
1569 }
1570
1571 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1572 NAPI_GRO_CB(skb)->flush |= flush;
1573 skb_set_network_header(skb, off);
1574 /* The above will be needed by the transport layer if there is one
1575 * immediately following this IP hdr.
1576 */
1577 NAPI_GRO_CB(skb)->inner_network_offset = off;
1578
1579 /* Note : No need to call skb_gro_postpull_rcsum() here,
1580 * as we already checked checksum over ipv4 header was 0
1581 */
1582 skb_gro_pull(skb, sizeof(*iph));
1583 skb_set_transport_header(skb, skb_gro_offset(skb));
1584
1585 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1586 ops->callbacks.gro_receive, head, skb);
1587
1588out:
1589 skb_gro_flush_final(skb, pp, flush);
1590
1591 return pp;
1592}
1593
1594static struct sk_buff *ipip_gro_receive(struct list_head *head,
1595 struct sk_buff *skb)
1596{
1597 if (NAPI_GRO_CB(skb)->encap_mark) {
1598 NAPI_GRO_CB(skb)->flush = 1;
1599 return NULL;
1600 }
1601
1602 NAPI_GRO_CB(skb)->encap_mark = 1;
1603
1604 return inet_gro_receive(head, skb);
1605}
1606
1607#define SECONDS_PER_DAY 86400
1608
1609/* inet_current_timestamp - Return IP network timestamp
1610 *
1611 * Return milliseconds since midnight in network byte order.
1612 */
1613__be32 inet_current_timestamp(void)
1614{
1615 u32 secs;
1616 u32 msecs;
1617 struct timespec64 ts;
1618
1619 ktime_get_real_ts64(&ts);
1620
1621 /* Get secs since midnight. */
1622 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1623 /* Convert to msecs. */
1624 msecs = secs * MSEC_PER_SEC;
1625 /* Convert nsec to msec. */
1626 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1627
1628 /* Convert to network byte order. */
1629 return htonl(msecs);
1630}
1631EXPORT_SYMBOL(inet_current_timestamp);
1632
1633int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1634{
1635 unsigned int family = READ_ONCE(sk->sk_family);
1636
1637 if (family == AF_INET)
1638 return ip_recv_error(sk, msg, len, addr_len);
1639#if IS_ENABLED(CONFIG_IPV6)
1640 if (family == AF_INET6)
1641 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1642#endif
1643 return -EINVAL;
1644}
1645EXPORT_SYMBOL(inet_recv_error);
1646
1647int inet_gro_complete(struct sk_buff *skb, int nhoff)
1648{
1649 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1650 const struct net_offload *ops;
1651 __be16 totlen = iph->tot_len;
1652 int proto = iph->protocol;
1653 int err = -ENOSYS;
1654
1655 if (skb->encapsulation) {
1656 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1657 skb_set_inner_network_header(skb, nhoff);
1658 }
1659
1660 iph_set_totlen(iph, skb->len - nhoff);
1661 csum_replace2(&iph->check, totlen, iph->tot_len);
1662
1663 ops = rcu_dereference(inet_offloads[proto]);
1664 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1665 goto out;
1666
1667 /* Only need to add sizeof(*iph) to get to the next hdr below
1668 * because any hdr with option will have been flushed in
1669 * inet_gro_receive().
1670 */
1671 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1672 tcp4_gro_complete, udp4_gro_complete,
1673 skb, nhoff + sizeof(*iph));
1674
1675out:
1676 return err;
1677}
1678
1679static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1680{
1681 skb->encapsulation = 1;
1682 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1683 return inet_gro_complete(skb, nhoff);
1684}
1685
1686int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1687 unsigned short type, unsigned char protocol,
1688 struct net *net)
1689{
1690 struct socket *sock;
1691 int rc = sock_create_kern(net, family, type, protocol, &sock);
1692
1693 if (rc == 0) {
1694 *sk = sock->sk;
1695 (*sk)->sk_allocation = GFP_ATOMIC;
1696 (*sk)->sk_use_task_frag = false;
1697 /*
1698 * Unhash it so that IP input processing does not even see it,
1699 * we do not wish this socket to see incoming packets.
1700 */
1701 (*sk)->sk_prot->unhash(*sk);
1702 }
1703 return rc;
1704}
1705EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1706
1707unsigned long snmp_fold_field(void __percpu *mib, int offt)
1708{
1709 unsigned long res = 0;
1710 int i;
1711
1712 for_each_possible_cpu(i)
1713 res += snmp_get_cpu_field(mib, i, offt);
1714 return res;
1715}
1716EXPORT_SYMBOL_GPL(snmp_fold_field);
1717
1718#if BITS_PER_LONG==32
1719
1720u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1721 size_t syncp_offset)
1722{
1723 void *bhptr;
1724 struct u64_stats_sync *syncp;
1725 u64 v;
1726 unsigned int start;
1727
1728 bhptr = per_cpu_ptr(mib, cpu);
1729 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1730 do {
1731 start = u64_stats_fetch_begin(syncp);
1732 v = *(((u64 *)bhptr) + offt);
1733 } while (u64_stats_fetch_retry(syncp, start));
1734
1735 return v;
1736}
1737EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1738
1739u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1740{
1741 u64 res = 0;
1742 int cpu;
1743
1744 for_each_possible_cpu(cpu) {
1745 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1746 }
1747 return res;
1748}
1749EXPORT_SYMBOL_GPL(snmp_fold_field64);
1750#endif
1751
1752#ifdef CONFIG_IP_MULTICAST
1753static const struct net_protocol igmp_protocol = {
1754 .handler = igmp_rcv,
1755};
1756#endif
1757
1758static const struct net_protocol icmp_protocol = {
1759 .handler = icmp_rcv,
1760 .err_handler = icmp_err,
1761 .no_policy = 1,
1762};
1763
1764static __net_init int ipv4_mib_init_net(struct net *net)
1765{
1766 int i;
1767
1768 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1769 if (!net->mib.tcp_statistics)
1770 goto err_tcp_mib;
1771 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1772 if (!net->mib.ip_statistics)
1773 goto err_ip_mib;
1774
1775 for_each_possible_cpu(i) {
1776 struct ipstats_mib *af_inet_stats;
1777 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1778 u64_stats_init(&af_inet_stats->syncp);
1779 }
1780
1781 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1782 if (!net->mib.net_statistics)
1783 goto err_net_mib;
1784 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1785 if (!net->mib.udp_statistics)
1786 goto err_udp_mib;
1787 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1788 if (!net->mib.udplite_statistics)
1789 goto err_udplite_mib;
1790 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1791 if (!net->mib.icmp_statistics)
1792 goto err_icmp_mib;
1793 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1794 GFP_KERNEL);
1795 if (!net->mib.icmpmsg_statistics)
1796 goto err_icmpmsg_mib;
1797
1798 tcp_mib_init(net);
1799 return 0;
1800
1801err_icmpmsg_mib:
1802 free_percpu(net->mib.icmp_statistics);
1803err_icmp_mib:
1804 free_percpu(net->mib.udplite_statistics);
1805err_udplite_mib:
1806 free_percpu(net->mib.udp_statistics);
1807err_udp_mib:
1808 free_percpu(net->mib.net_statistics);
1809err_net_mib:
1810 free_percpu(net->mib.ip_statistics);
1811err_ip_mib:
1812 free_percpu(net->mib.tcp_statistics);
1813err_tcp_mib:
1814 return -ENOMEM;
1815}
1816
1817static __net_exit void ipv4_mib_exit_net(struct net *net)
1818{
1819 kfree(net->mib.icmpmsg_statistics);
1820 free_percpu(net->mib.icmp_statistics);
1821 free_percpu(net->mib.udplite_statistics);
1822 free_percpu(net->mib.udp_statistics);
1823 free_percpu(net->mib.net_statistics);
1824 free_percpu(net->mib.ip_statistics);
1825 free_percpu(net->mib.tcp_statistics);
1826#ifdef CONFIG_MPTCP
1827 /* allocated on demand, see mptcp_init_sock() */
1828 free_percpu(net->mib.mptcp_statistics);
1829#endif
1830}
1831
1832static __net_initdata struct pernet_operations ipv4_mib_ops = {
1833 .init = ipv4_mib_init_net,
1834 .exit = ipv4_mib_exit_net,
1835};
1836
1837static int __init init_ipv4_mibs(void)
1838{
1839 return register_pernet_subsys(&ipv4_mib_ops);
1840}
1841
1842static __net_init int inet_init_net(struct net *net)
1843{
1844 /*
1845 * Set defaults for local port range
1846 */
1847 net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u;
1848
1849 seqlock_init(&net->ipv4.ping_group_range.lock);
1850 /*
1851 * Sane defaults - nobody may create ping sockets.
1852 * Boot scripts should set this to distro-specific group.
1853 */
1854 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1855 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1856
1857 /* Default values for sysctl-controlled parameters.
1858 * We set them here, in case sysctl is not compiled.
1859 */
1860 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1861 net->ipv4.sysctl_ip_fwd_update_priority = 1;
1862 net->ipv4.sysctl_ip_dynaddr = 0;
1863 net->ipv4.sysctl_ip_early_demux = 1;
1864 net->ipv4.sysctl_udp_early_demux = 1;
1865 net->ipv4.sysctl_tcp_early_demux = 1;
1866 net->ipv4.sysctl_nexthop_compat_mode = 1;
1867#ifdef CONFIG_SYSCTL
1868 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1869#endif
1870
1871 /* Some igmp sysctl, whose values are always used */
1872 net->ipv4.sysctl_igmp_max_memberships = 20;
1873 net->ipv4.sysctl_igmp_max_msf = 10;
1874 /* IGMP reports for link-local multicast groups are enabled by default */
1875 net->ipv4.sysctl_igmp_llm_reports = 1;
1876 net->ipv4.sysctl_igmp_qrv = 2;
1877
1878 net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1879
1880 return 0;
1881}
1882
1883static __net_initdata struct pernet_operations af_inet_ops = {
1884 .init = inet_init_net,
1885};
1886
1887static int __init init_inet_pernet_ops(void)
1888{
1889 return register_pernet_subsys(&af_inet_ops);
1890}
1891
1892static int ipv4_proc_init(void);
1893
1894/*
1895 * IP protocol layer initialiser
1896 */
1897
1898
1899static const struct net_offload ipip_offload = {
1900 .callbacks = {
1901 .gso_segment = ipip_gso_segment,
1902 .gro_receive = ipip_gro_receive,
1903 .gro_complete = ipip_gro_complete,
1904 },
1905};
1906
1907static int __init ipip_offload_init(void)
1908{
1909 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1910}
1911
1912static int __init ipv4_offload_init(void)
1913{
1914 /*
1915 * Add offloads
1916 */
1917 if (udpv4_offload_init() < 0)
1918 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1919 if (tcpv4_offload_init() < 0)
1920 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1921 if (ipip_offload_init() < 0)
1922 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1923
1924 net_hotdata.ip_packet_offload = (struct packet_offload) {
1925 .type = cpu_to_be16(ETH_P_IP),
1926 .callbacks = {
1927 .gso_segment = inet_gso_segment,
1928 .gro_receive = inet_gro_receive,
1929 .gro_complete = inet_gro_complete,
1930 },
1931 };
1932 dev_add_offload(&net_hotdata.ip_packet_offload);
1933 return 0;
1934}
1935
1936fs_initcall(ipv4_offload_init);
1937
1938static struct packet_type ip_packet_type __read_mostly = {
1939 .type = cpu_to_be16(ETH_P_IP),
1940 .func = ip_rcv,
1941 .list_func = ip_list_rcv,
1942};
1943
1944static int __init inet_init(void)
1945{
1946 struct inet_protosw *q;
1947 struct list_head *r;
1948 int rc;
1949
1950 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1951
1952 raw_hashinfo_init(&raw_v4_hashinfo);
1953
1954 rc = proto_register(&tcp_prot, 1);
1955 if (rc)
1956 goto out;
1957
1958 rc = proto_register(&udp_prot, 1);
1959 if (rc)
1960 goto out_unregister_tcp_proto;
1961
1962 rc = proto_register(&raw_prot, 1);
1963 if (rc)
1964 goto out_unregister_udp_proto;
1965
1966 rc = proto_register(&ping_prot, 1);
1967 if (rc)
1968 goto out_unregister_raw_proto;
1969
1970 /*
1971 * Tell SOCKET that we are alive...
1972 */
1973
1974 (void)sock_register(&inet_family_ops);
1975
1976#ifdef CONFIG_SYSCTL
1977 ip_static_sysctl_init();
1978#endif
1979
1980 /*
1981 * Add all the base protocols.
1982 */
1983
1984 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1985 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1986
1987 net_hotdata.udp_protocol = (struct net_protocol) {
1988 .handler = udp_rcv,
1989 .err_handler = udp_err,
1990 .no_policy = 1,
1991 };
1992 if (inet_add_protocol(&net_hotdata.udp_protocol, IPPROTO_UDP) < 0)
1993 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1994
1995 net_hotdata.tcp_protocol = (struct net_protocol) {
1996 .handler = tcp_v4_rcv,
1997 .err_handler = tcp_v4_err,
1998 .no_policy = 1,
1999 .icmp_strict_tag_validation = 1,
2000 };
2001 if (inet_add_protocol(&net_hotdata.tcp_protocol, IPPROTO_TCP) < 0)
2002 pr_crit("%s: Cannot add TCP protocol\n", __func__);
2003#ifdef CONFIG_IP_MULTICAST
2004 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
2005 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
2006#endif
2007
2008 /* Register the socket-side information for inet_create. */
2009 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
2010 INIT_LIST_HEAD(r);
2011
2012 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
2013 inet_register_protosw(q);
2014
2015 /*
2016 * Set the ARP module up
2017 */
2018
2019 arp_init();
2020
2021 /*
2022 * Set the IP module up
2023 */
2024
2025 ip_init();
2026
2027 /* Initialise per-cpu ipv4 mibs */
2028 if (init_ipv4_mibs())
2029 panic("%s: Cannot init ipv4 mibs\n", __func__);
2030
2031 /* Setup TCP slab cache for open requests. */
2032 tcp_init();
2033
2034 /* Setup UDP memory threshold */
2035 udp_init();
2036
2037 /* Add UDP-Lite (RFC 3828) */
2038 udplite4_register();
2039
2040 raw_init();
2041
2042 ping_init();
2043
2044 /*
2045 * Set the ICMP layer up
2046 */
2047
2048 if (icmp_init() < 0)
2049 panic("Failed to create the ICMP control socket.\n");
2050
2051 /*
2052 * Initialise the multicast router
2053 */
2054#if defined(CONFIG_IP_MROUTE)
2055 if (ip_mr_init())
2056 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2057#endif
2058
2059 if (init_inet_pernet_ops())
2060 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2061
2062 ipv4_proc_init();
2063
2064 ipfrag_init();
2065
2066 dev_add_pack(&ip_packet_type);
2067
2068 ip_tunnel_core_init();
2069
2070 rc = 0;
2071out:
2072 return rc;
2073out_unregister_raw_proto:
2074 proto_unregister(&raw_prot);
2075out_unregister_udp_proto:
2076 proto_unregister(&udp_prot);
2077out_unregister_tcp_proto:
2078 proto_unregister(&tcp_prot);
2079 goto out;
2080}
2081
2082fs_initcall(inet_init);
2083
2084/* ------------------------------------------------------------------------ */
2085
2086#ifdef CONFIG_PROC_FS
2087static int __init ipv4_proc_init(void)
2088{
2089 int rc = 0;
2090
2091 if (raw_proc_init())
2092 goto out_raw;
2093 if (tcp4_proc_init())
2094 goto out_tcp;
2095 if (udp4_proc_init())
2096 goto out_udp;
2097 if (ping_proc_init())
2098 goto out_ping;
2099 if (ip_misc_proc_init())
2100 goto out_misc;
2101out:
2102 return rc;
2103out_misc:
2104 ping_proc_exit();
2105out_ping:
2106 udp4_proc_exit();
2107out_udp:
2108 tcp4_proc_exit();
2109out_tcp:
2110 raw_proc_exit();
2111out_raw:
2112 rc = -ENOMEM;
2113 goto out;
2114}
2115
2116#else /* CONFIG_PROC_FS */
2117static int __init ipv4_proc_init(void)
2118{
2119 return 0;
2120}
2121#endif /* CONFIG_PROC_FS */