1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * PF_INET protocol family socket handler.
8 *
9 * Authors: Ross Biro
10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 * Florian La Roche, <flla@stud.uni-sb.de>
12 * Alan Cox, <A.Cox@swansea.ac.uk>
13 *
14 * Changes (see also sock.c)
15 *
16 * piggy,
17 * Karl Knutson : Socket protocol table
18 * A.N.Kuznetsov : Socket death error in accept().
19 * John Richardson : Fix non blocking error in connect()
20 * so sockets that fail to connect
21 * don't return -EINPROGRESS.
22 * Alan Cox : Asynchronous I/O support
23 * Alan Cox : Keep correct socket pointer on sock
24 * structures
25 * when accept() ed
26 * Alan Cox : Semantics of SO_LINGER aren't state
27 * moved to close when you look carefully.
28 * With this fixed and the accept bug fixed
29 * some RPC stuff seems happier.
30 * Niibe Yutaka : 4.4BSD style write async I/O
31 * Alan Cox,
32 * Tony Gale : Fixed reuse semantics.
33 * Alan Cox : bind() shouldn't abort existing but dead
34 * sockets. Stops FTP netin:.. I hope.
35 * Alan Cox : bind() works correctly for RAW sockets.
36 * Note that FreeBSD at least was broken
37 * in this respect so be careful with
38 * compatibility tests...
39 * Alan Cox : routing cache support
40 * Alan Cox : memzero the socket structure for
41 * compactness.
42 * Matt Day : nonblock connect error handler
43 * Alan Cox : Allow large numbers of pending sockets
44 * (eg for big web sites), but only if
45 * specifically application requested.
46 * Alan Cox : New buffering throughout IP. Used
47 * dumbly.
48 * Alan Cox : New buffering now used smartly.
49 * Alan Cox : BSD rather than common sense
50 * interpretation of listen.
51 * Germano Caronni : Assorted small races.
52 * Alan Cox : sendmsg/recvmsg basic support.
53 * Alan Cox : Only sendmsg/recvmsg now supported.
54 * Alan Cox : Locked down bind (see security list).
55 * Alan Cox : Loosened bind a little.
56 * Mike McLagan : ADD/DEL DLCI Ioctls
57 * Willy Konynenberg : Transparent proxying support.
58 * David S. Miller : New socket lookup architecture.
59 * Some other random speedups.
60 * Cyrus Durgin : Cleaned up file for kmod hacks.
61 * Andi Kleen : Fix inet_stream_connect TCP race.
62 */
63
64 #define pr_fmt(fmt) "IPv4: " fmt
65
66 #include <linux/err.h>
67 #include <linux/errno.h>
68 #include <linux/types.h>
69 #include <linux/socket.h>
70 #include <linux/in.h>
71 #include <linux/kernel.h>
72 #include <linux/kmod.h>
73 #include <linux/sched.h>
74 #include <linux/timer.h>
75 #include <linux/string.h>
76 #include <linux/sockios.h>
77 #include <linux/net.h>
78 #include <linux/capability.h>
79 #include <linux/fcntl.h>
80 #include <linux/mm.h>
81 #include <linux/interrupt.h>
82 #include <linux/stat.h>
83 #include <linux/init.h>
84 #include <linux/poll.h>
85 #include <linux/netfilter_ipv4.h>
86 #include <linux/random.h>
87 #include <linux/slab.h>
88
89 #include <linux/uaccess.h>
90
91 #include <linux/inet.h>
92 #include <linux/igmp.h>
93 #include <linux/inetdevice.h>
94 #include <linux/netdevice.h>
95 #include <net/checksum.h>
96 #include <net/ip.h>
97 #include <net/protocol.h>
98 #include <net/arp.h>
99 #include <net/route.h>
100 #include <net/ip_fib.h>
101 #include <net/inet_connection_sock.h>
102 #include <net/tcp.h>
103 #include <net/udp.h>
104 #include <net/udplite.h>
105 #include <net/ping.h>
106 #include <linux/skbuff.h>
107 #include <net/sock.h>
108 #include <net/raw.h>
109 #include <net/icmp.h>
110 #include <net/inet_common.h>
111 #include <net/ip_tunnels.h>
112 #include <net/xfrm.h>
113 #include <net/net_namespace.h>
114 #include <net/secure_seq.h>
115 #ifdef CONFIG_IP_MROUTE
116 #include <linux/mroute.h>
117 #endif
118 #include <net/l3mdev.h>
119 #include <net/compat.h>
120
121 #include <trace/events/sock.h>
122
123 /* The inetsw table contains everything that inet_create needs to
124 * build a new socket.
125 */
126 static struct list_head inetsw[SOCK_MAX];
127 static DEFINE_SPINLOCK(inetsw_lock);
128
129 /* New destruction routine */
130
inet_sock_destruct(struct sock * sk)131 void inet_sock_destruct(struct sock *sk)
132 {
133 struct inet_sock *inet = inet_sk(sk);
134
135 __skb_queue_purge(&sk->sk_receive_queue);
136 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(rcu_dereference_protected(sk->sk_rx_dst, 1));
162 sk_refcnt_debug_dec(sk);
163 }
164 EXPORT_SYMBOL(inet_sock_destruct);
165
166 /*
167 * The routines beyond this point handle the behaviour of an AF_INET
168 * socket object. Mostly it punts to the subprotocols of IP to do
169 * the work.
170 */
171
172 /*
173 * Automatically bind an unbound socket.
174 */
175
inet_autobind(struct sock * sk)176 static int inet_autobind(struct sock *sk)
177 {
178 struct inet_sock *inet;
179 /* We may need to bind the socket. */
180 lock_sock(sk);
181 inet = inet_sk(sk);
182 if (!inet->inet_num) {
183 if (sk->sk_prot->get_port(sk, 0)) {
184 release_sock(sk);
185 return -EAGAIN;
186 }
187 inet->inet_sport = htons(inet->inet_num);
188 }
189 release_sock(sk);
190 return 0;
191 }
192
193 /*
194 * Move a socket into listening state.
195 */
inet_listen(struct socket * sock,int backlog)196 int inet_listen(struct socket *sock, int backlog)
197 {
198 struct sock *sk = sock->sk;
199 unsigned char old_state;
200 int err, tcp_fastopen;
201
202 lock_sock(sk);
203
204 err = -EINVAL;
205 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
206 goto out;
207
208 old_state = sk->sk_state;
209 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
210 goto out;
211
212 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
213 /* Really, if the socket is already in listen state
214 * we can only allow the backlog to be adjusted.
215 */
216 if (old_state != TCP_LISTEN) {
217 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
218 * Note that only TCP sockets (SOCK_STREAM) will reach here.
219 * Also fastopen backlog may already been set via the option
220 * because the socket was in TCP_LISTEN state previously but
221 * was shutdown() rather than close().
222 */
223 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen);
224 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
225 (tcp_fastopen & TFO_SERVER_ENABLE) &&
226 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
227 fastopen_queue_tune(sk, backlog);
228 tcp_fastopen_init_key_once(sock_net(sk));
229 }
230
231 err = inet_csk_listen_start(sk, backlog);
232 if (err)
233 goto out;
234 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
235 }
236 err = 0;
237
238 out:
239 release_sock(sk);
240 return err;
241 }
242 EXPORT_SYMBOL(inet_listen);
243
244 /*
245 * Create an inet socket.
246 */
247
inet_create(struct net * net,struct socket * sock,int protocol,int kern)248 static int inet_create(struct net *net, struct socket *sock, int protocol,
249 int kern)
250 {
251 struct sock *sk;
252 struct inet_protosw *answer;
253 struct inet_sock *inet;
254 struct proto *answer_prot;
255 unsigned char answer_flags;
256 int try_loading_module = 0;
257 int err;
258
259 if (protocol < 0 || protocol >= IPPROTO_MAX)
260 return -EINVAL;
261
262 sock->state = SS_UNCONNECTED;
263
264 /* Look for the requested type/protocol pair. */
265 lookup_protocol:
266 err = -ESOCKTNOSUPPORT;
267 rcu_read_lock();
268 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
269
270 err = 0;
271 /* Check the non-wild match. */
272 if (protocol == answer->protocol) {
273 if (protocol != IPPROTO_IP)
274 break;
275 } else {
276 /* Check for the two wild cases. */
277 if (IPPROTO_IP == protocol) {
278 protocol = answer->protocol;
279 break;
280 }
281 if (IPPROTO_IP == answer->protocol)
282 break;
283 }
284 err = -EPROTONOSUPPORT;
285 }
286
287 if (unlikely(err)) {
288 if (try_loading_module < 2) {
289 rcu_read_unlock();
290 /*
291 * Be more specific, e.g. net-pf-2-proto-132-type-1
292 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
293 */
294 if (++try_loading_module == 1)
295 request_module("net-pf-%d-proto-%d-type-%d",
296 PF_INET, protocol, sock->type);
297 /*
298 * Fall back to generic, e.g. net-pf-2-proto-132
299 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
300 */
301 else
302 request_module("net-pf-%d-proto-%d",
303 PF_INET, protocol);
304 goto lookup_protocol;
305 } else
306 goto out_rcu_unlock;
307 }
308
309 err = -EPERM;
310 if (sock->type == SOCK_RAW && !kern &&
311 !ns_capable(net->user_ns, CAP_NET_RAW))
312 goto out_rcu_unlock;
313
314 sock->ops = answer->ops;
315 answer_prot = answer->prot;
316 answer_flags = answer->flags;
317 rcu_read_unlock();
318
319 WARN_ON(!answer_prot->slab);
320
321 err = -ENOBUFS;
322 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
323 if (!sk)
324 goto out;
325
326 err = 0;
327 if (INET_PROTOSW_REUSE & answer_flags)
328 sk->sk_reuse = SK_CAN_REUSE;
329
330 if (INET_PROTOSW_ICSK & answer_flags)
331 inet_init_csk_locks(sk);
332
333 inet = inet_sk(sk);
334 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
335
336 inet->nodefrag = 0;
337
338 if (SOCK_RAW == sock->type) {
339 inet->inet_num = protocol;
340 if (IPPROTO_RAW == protocol)
341 inet->hdrincl = 1;
342 }
343
344 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
345 inet->pmtudisc = IP_PMTUDISC_DONT;
346 else
347 inet->pmtudisc = IP_PMTUDISC_WANT;
348
349 inet->inet_id = 0;
350
351 sock_init_data(sock, sk);
352
353 sk->sk_destruct = inet_sock_destruct;
354 sk->sk_protocol = protocol;
355 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
356
357 inet->uc_ttl = -1;
358 inet->mc_loop = 1;
359 inet->mc_ttl = 1;
360 inet->mc_all = 1;
361 inet->mc_index = 0;
362 inet->mc_list = NULL;
363 inet->rcv_tos = 0;
364
365 sk_refcnt_debug_inc(sk);
366
367 if (inet->inet_num) {
368 /* It assumes that any protocol which allows
369 * the user to assign a number at socket
370 * creation time automatically
371 * shares.
372 */
373 inet->inet_sport = htons(inet->inet_num);
374 /* Add to protocol hash chains. */
375 err = sk->sk_prot->hash(sk);
376 if (err) {
377 sk_common_release(sk);
378 goto out;
379 }
380 }
381
382 if (sk->sk_prot->init) {
383 err = sk->sk_prot->init(sk);
384 if (err) {
385 sk_common_release(sk);
386 goto out;
387 }
388 }
389
390 if (!kern) {
391 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
392 if (err) {
393 sk_common_release(sk);
394 goto out;
395 }
396 }
397 out:
398 return err;
399 out_rcu_unlock:
400 rcu_read_unlock();
401 goto out;
402 }
403
404
405 /*
406 * The peer socket should always be NULL (or else). When we call this
407 * function we are destroying the object and from then on nobody
408 * should refer to it.
409 */
inet_release(struct socket * sock)410 int inet_release(struct socket *sock)
411 {
412 struct sock *sk = sock->sk;
413
414 if (sk) {
415 long timeout;
416
417 if (!sk->sk_kern_sock)
418 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
419
420 /* Applications forget to leave groups before exiting */
421 ip_mc_drop_socket(sk);
422
423 /* If linger is set, we don't return until the close
424 * is complete. Otherwise we return immediately. The
425 * actually closing is done the same either way.
426 *
427 * If the close is due to the process exiting, we never
428 * linger..
429 */
430 timeout = 0;
431 if (sock_flag(sk, SOCK_LINGER) &&
432 !(current->flags & PF_EXITING))
433 timeout = sk->sk_lingertime;
434 sk->sk_prot->close(sk, timeout);
435 sock->sk = NULL;
436 }
437 return 0;
438 }
439 EXPORT_SYMBOL(inet_release);
440
inet_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)441 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
442 {
443 struct sock *sk = sock->sk;
444 int err;
445
446 /* If the socket has its own bind function then use it. (RAW) */
447 if (sk->sk_prot->bind) {
448 return sk->sk_prot->bind(sk, uaddr, addr_len);
449 }
450 if (addr_len < sizeof(struct sockaddr_in))
451 return -EINVAL;
452
453 /* BPF prog is run before any checks are done so that if the prog
454 * changes context in a wrong way it will be caught.
455 */
456 err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr);
457 if (err)
458 return err;
459
460 return __inet_bind(sk, uaddr, addr_len, BIND_WITH_LOCK);
461 }
462 EXPORT_SYMBOL(inet_bind);
463
__inet_bind(struct sock * sk,struct sockaddr * uaddr,int addr_len,u32 flags)464 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
465 u32 flags)
466 {
467 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
468 struct inet_sock *inet = inet_sk(sk);
469 struct net *net = sock_net(sk);
470 unsigned short snum;
471 int chk_addr_ret;
472 u32 tb_id = RT_TABLE_LOCAL;
473 int err;
474
475 if (addr->sin_family != AF_INET) {
476 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
477 * only if s_addr is INADDR_ANY.
478 */
479 err = -EAFNOSUPPORT;
480 if (addr->sin_family != AF_UNSPEC ||
481 addr->sin_addr.s_addr != htonl(INADDR_ANY))
482 goto out;
483 }
484
485 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
486 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
487
488 /* Not specified by any standard per-se, however it breaks too
489 * many applications when removed. It is unfortunate since
490 * allowing applications to make a non-local bind solves
491 * several problems with systems using dynamic addressing.
492 * (ie. your servers still start up even if your ISDN link
493 * is temporarily down)
494 */
495 err = -EADDRNOTAVAIL;
496 if (!inet_can_nonlocal_bind(net, inet) &&
497 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
498 chk_addr_ret != RTN_LOCAL &&
499 chk_addr_ret != RTN_MULTICAST &&
500 chk_addr_ret != RTN_BROADCAST)
501 goto out;
502
503 snum = ntohs(addr->sin_port);
504 err = -EACCES;
505 if (snum && inet_port_requires_bind_service(net, snum) &&
506 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
507 goto out;
508
509 /* We keep a pair of addresses. rcv_saddr is the one
510 * used by hash lookups, and saddr is used for transmit.
511 *
512 * In the BSD API these are the same except where it
513 * would be illegal to use them (multicast/broadcast) in
514 * which case the sending device address is used.
515 */
516 if (flags & BIND_WITH_LOCK)
517 lock_sock(sk);
518
519 /* Check these errors (active socket, double bind). */
520 err = -EINVAL;
521 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
522 goto out_release_sock;
523
524 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
525 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
526 inet->inet_saddr = 0; /* Use device */
527
528 /* Make sure we are allowed to bind here. */
529 if (snum || !(inet->bind_address_no_port ||
530 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
531 if (sk->sk_prot->get_port(sk, snum)) {
532 inet->inet_saddr = inet->inet_rcv_saddr = 0;
533 err = -EADDRINUSE;
534 goto out_release_sock;
535 }
536 if (!(flags & BIND_FROM_BPF)) {
537 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
538 if (err) {
539 inet->inet_saddr = inet->inet_rcv_saddr = 0;
540 goto out_release_sock;
541 }
542 }
543 }
544
545 if (inet->inet_rcv_saddr)
546 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
547 if (snum)
548 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
549 inet->inet_sport = htons(inet->inet_num);
550 inet->inet_daddr = 0;
551 inet->inet_dport = 0;
552 sk_dst_reset(sk);
553 err = 0;
554 out_release_sock:
555 if (flags & BIND_WITH_LOCK)
556 release_sock(sk);
557 out:
558 return err;
559 }
560
inet_dgram_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)561 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
562 int addr_len, int flags)
563 {
564 struct sock *sk = sock->sk;
565 const struct proto *prot;
566 int err;
567
568 if (addr_len < sizeof(uaddr->sa_family))
569 return -EINVAL;
570
571 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
572 prot = READ_ONCE(sk->sk_prot);
573
574 if (uaddr->sa_family == AF_UNSPEC)
575 return prot->disconnect(sk, flags);
576
577 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
578 err = prot->pre_connect(sk, uaddr, addr_len);
579 if (err)
580 return err;
581 }
582
583 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
584 return -EAGAIN;
585 return prot->connect(sk, uaddr, addr_len);
586 }
587 EXPORT_SYMBOL(inet_dgram_connect);
588
inet_wait_for_connect(struct sock * sk,long timeo,int writebias)589 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
590 {
591 DEFINE_WAIT_FUNC(wait, woken_wake_function);
592
593 add_wait_queue(sk_sleep(sk), &wait);
594 sk->sk_write_pending += writebias;
595
596 /* Basic assumption: if someone sets sk->sk_err, he _must_
597 * change state of the socket from TCP_SYN_*.
598 * Connect() does not allow to get error notifications
599 * without closing the socket.
600 */
601 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
602 release_sock(sk);
603 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
604 lock_sock(sk);
605 if (signal_pending(current) || !timeo)
606 break;
607 }
608 remove_wait_queue(sk_sleep(sk), &wait);
609 sk->sk_write_pending -= writebias;
610 return timeo;
611 }
612
613 /*
614 * Connect to a remote host. There is regrettably still a little
615 * TCP 'magic' in here.
616 */
__inet_stream_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags,int is_sendmsg)617 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
618 int addr_len, int flags, int is_sendmsg)
619 {
620 struct sock *sk = sock->sk;
621 int err;
622 long timeo;
623
624 /*
625 * uaddr can be NULL and addr_len can be 0 if:
626 * sk is a TCP fastopen active socket and
627 * TCP_FASTOPEN_CONNECT sockopt is set and
628 * we already have a valid cookie for this socket.
629 * In this case, user can call write() after connect().
630 * write() will invoke tcp_sendmsg_fastopen() which calls
631 * __inet_stream_connect().
632 */
633 if (uaddr) {
634 if (addr_len < sizeof(uaddr->sa_family))
635 return -EINVAL;
636
637 if (uaddr->sa_family == AF_UNSPEC) {
638 err = sk->sk_prot->disconnect(sk, flags);
639 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
640 goto out;
641 }
642 }
643
644 switch (sock->state) {
645 default:
646 err = -EINVAL;
647 goto out;
648 case SS_CONNECTED:
649 err = -EISCONN;
650 goto out;
651 case SS_CONNECTING:
652 if (inet_sk(sk)->defer_connect)
653 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
654 else
655 err = -EALREADY;
656 /* Fall out of switch with err, set for this state */
657 break;
658 case SS_UNCONNECTED:
659 err = -EISCONN;
660 if (sk->sk_state != TCP_CLOSE)
661 goto out;
662
663 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
664 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
665 if (err)
666 goto out;
667 }
668
669 err = sk->sk_prot->connect(sk, uaddr, addr_len);
670 if (err < 0)
671 goto out;
672
673 sock->state = SS_CONNECTING;
674
675 if (!err && inet_sk(sk)->defer_connect)
676 goto out;
677
678 /* Just entered SS_CONNECTING state; the only
679 * difference is that return value in non-blocking
680 * case is EINPROGRESS, rather than EALREADY.
681 */
682 err = -EINPROGRESS;
683 break;
684 }
685
686 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
687
688 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
689 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
690 tcp_sk(sk)->fastopen_req &&
691 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
692
693 /* Error code is set above */
694 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
695 goto out;
696
697 err = sock_intr_errno(timeo);
698 if (signal_pending(current))
699 goto out;
700 }
701
702 /* Connection was closed by RST, timeout, ICMP error
703 * or another process disconnected us.
704 */
705 if (sk->sk_state == TCP_CLOSE)
706 goto sock_error;
707
708 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
709 * and error was received after socket entered established state.
710 * Hence, it is handled normally after connect() return successfully.
711 */
712
713 sock->state = SS_CONNECTED;
714 err = 0;
715 out:
716 return err;
717
718 sock_error:
719 err = sock_error(sk) ? : -ECONNABORTED;
720 sock->state = SS_UNCONNECTED;
721 if (sk->sk_prot->disconnect(sk, flags))
722 sock->state = SS_DISCONNECTING;
723 goto out;
724 }
725 EXPORT_SYMBOL(__inet_stream_connect);
726
inet_stream_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)727 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
728 int addr_len, int flags)
729 {
730 int err;
731
732 lock_sock(sock->sk);
733 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
734 release_sock(sock->sk);
735 return err;
736 }
737 EXPORT_SYMBOL(inet_stream_connect);
738
739 /*
740 * Accept a pending connection. The TCP layer now gives BSD semantics.
741 */
742
inet_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)743 int inet_accept(struct socket *sock, struct socket *newsock, int flags,
744 bool kern)
745 {
746 struct sock *sk1 = sock->sk, *sk2;
747 int err = -EINVAL;
748
749 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
750 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, flags, &err, kern);
751 if (!sk2)
752 goto do_err;
753
754 lock_sock(sk2);
755
756 sock_rps_record_flow(sk2);
757 WARN_ON(!((1 << sk2->sk_state) &
758 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
759 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
760
761 sock_graft(sk2, newsock);
762
763 newsock->state = SS_CONNECTED;
764 err = 0;
765 release_sock(sk2);
766 do_err:
767 return err;
768 }
769 EXPORT_SYMBOL(inet_accept);
770
771 /*
772 * This does both peername and sockname.
773 */
inet_getname(struct socket * sock,struct sockaddr * uaddr,int peer)774 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
775 int peer)
776 {
777 struct sock *sk = sock->sk;
778 struct inet_sock *inet = inet_sk(sk);
779 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
780
781 sin->sin_family = AF_INET;
782 if (peer) {
783 if (!inet->inet_dport ||
784 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
785 peer == 1))
786 return -ENOTCONN;
787 sin->sin_port = inet->inet_dport;
788 sin->sin_addr.s_addr = inet->inet_daddr;
789 } else {
790 __be32 addr = inet->inet_rcv_saddr;
791 if (!addr)
792 addr = inet->inet_saddr;
793 sin->sin_port = inet->inet_sport;
794 sin->sin_addr.s_addr = addr;
795 }
796 if (cgroup_bpf_enabled)
797 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
798 peer ? BPF_CGROUP_INET4_GETPEERNAME :
799 BPF_CGROUP_INET4_GETSOCKNAME,
800 NULL);
801 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
802 return sizeof(*sin);
803 }
804 EXPORT_SYMBOL(inet_getname);
805
inet_send_prepare(struct sock * sk)806 int inet_send_prepare(struct sock *sk)
807 {
808 sock_rps_record_flow(sk);
809
810 /* We may need to bind the socket. */
811 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
812 inet_autobind(sk))
813 return -EAGAIN;
814
815 return 0;
816 }
817 EXPORT_SYMBOL_GPL(inet_send_prepare);
818
inet_sendmsg(struct socket * sock,struct msghdr * msg,size_t size)819 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
820 {
821 struct sock *sk = sock->sk;
822
823 if (unlikely(inet_send_prepare(sk)))
824 return -EAGAIN;
825
826 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
827 sk, msg, size);
828 }
829 EXPORT_SYMBOL(inet_sendmsg);
830
inet_sendpage(struct socket * sock,struct page * page,int offset,size_t size,int flags)831 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
832 size_t size, int flags)
833 {
834 struct sock *sk = sock->sk;
835 const struct proto *prot;
836
837 if (unlikely(inet_send_prepare(sk)))
838 return -EAGAIN;
839
840 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
841 prot = READ_ONCE(sk->sk_prot);
842 if (prot->sendpage)
843 return prot->sendpage(sk, page, offset, size, flags);
844 return sock_no_sendpage(sock, page, offset, size, flags);
845 }
846 EXPORT_SYMBOL(inet_sendpage);
847
848 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
849 size_t, int, int, int *));
inet_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)850 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
851 int flags)
852 {
853 struct sock *sk = sock->sk;
854 int addr_len = 0;
855 int err;
856
857 if (likely(!(flags & MSG_ERRQUEUE)))
858 sock_rps_record_flow(sk);
859
860 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
861 sk, msg, size, flags & MSG_DONTWAIT,
862 flags & ~MSG_DONTWAIT, &addr_len);
863 if (err >= 0)
864 msg->msg_namelen = addr_len;
865 return err;
866 }
867 EXPORT_SYMBOL(inet_recvmsg);
868
inet_shutdown(struct socket * sock,int how)869 int inet_shutdown(struct socket *sock, int how)
870 {
871 struct sock *sk = sock->sk;
872 int err = 0;
873
874 /* This should really check to make sure
875 * the socket is a TCP socket. (WHY AC...)
876 */
877 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
878 1->2 bit 2 snds.
879 2->3 */
880 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
881 return -EINVAL;
882
883 lock_sock(sk);
884 if (sock->state == SS_CONNECTING) {
885 if ((1 << sk->sk_state) &
886 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
887 sock->state = SS_DISCONNECTING;
888 else
889 sock->state = SS_CONNECTED;
890 }
891
892 switch (sk->sk_state) {
893 case TCP_CLOSE:
894 err = -ENOTCONN;
895 /* Hack to wake up other listeners, who can poll for
896 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
897 fallthrough;
898 default:
899 sk->sk_shutdown |= how;
900 if (sk->sk_prot->shutdown)
901 sk->sk_prot->shutdown(sk, how);
902 break;
903
904 /* Remaining two branches are temporary solution for missing
905 * close() in multithreaded environment. It is _not_ a good idea,
906 * but we have no choice until close() is repaired at VFS level.
907 */
908 case TCP_LISTEN:
909 if (!(how & RCV_SHUTDOWN))
910 break;
911 fallthrough;
912 case TCP_SYN_SENT:
913 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
914 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
915 break;
916 }
917
918 /* Wake up anyone sleeping in poll. */
919 sk->sk_state_change(sk);
920 release_sock(sk);
921 return err;
922 }
923 EXPORT_SYMBOL(inet_shutdown);
924
925 /*
926 * ioctl() calls you can issue on an INET socket. Most of these are
927 * device configuration and stuff and very rarely used. Some ioctls
928 * pass on to the socket itself.
929 *
930 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
931 * loads the devconfigure module does its configuring and unloads it.
932 * There's a good 20K of config code hanging around the kernel.
933 */
934
inet_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)935 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
936 {
937 struct sock *sk = sock->sk;
938 int err = 0;
939 struct net *net = sock_net(sk);
940 void __user *p = (void __user *)arg;
941 struct ifreq ifr;
942 struct rtentry rt;
943
944 switch (cmd) {
945 case SIOCADDRT:
946 case SIOCDELRT:
947 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
948 return -EFAULT;
949 err = ip_rt_ioctl(net, cmd, &rt);
950 break;
951 case SIOCRTMSG:
952 err = -EINVAL;
953 break;
954 case SIOCDARP:
955 case SIOCGARP:
956 case SIOCSARP:
957 err = arp_ioctl(net, cmd, (void __user *)arg);
958 break;
959 case SIOCGIFADDR:
960 case SIOCGIFBRDADDR:
961 case SIOCGIFNETMASK:
962 case SIOCGIFDSTADDR:
963 case SIOCGIFPFLAGS:
964 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
965 return -EFAULT;
966 err = devinet_ioctl(net, cmd, &ifr);
967 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
968 err = -EFAULT;
969 break;
970
971 case SIOCSIFADDR:
972 case SIOCSIFBRDADDR:
973 case SIOCSIFNETMASK:
974 case SIOCSIFDSTADDR:
975 case SIOCSIFPFLAGS:
976 case SIOCSIFFLAGS:
977 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
978 return -EFAULT;
979 err = devinet_ioctl(net, cmd, &ifr);
980 break;
981 default:
982 if (sk->sk_prot->ioctl)
983 err = sk->sk_prot->ioctl(sk, cmd, arg);
984 else
985 err = -ENOIOCTLCMD;
986 break;
987 }
988 return err;
989 }
990 EXPORT_SYMBOL(inet_ioctl);
991
992 #ifdef CONFIG_COMPAT
inet_compat_routing_ioctl(struct sock * sk,unsigned int cmd,struct compat_rtentry __user * ur)993 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
994 struct compat_rtentry __user *ur)
995 {
996 compat_uptr_t rtdev;
997 struct rtentry rt;
998
999 if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
1000 3 * sizeof(struct sockaddr)) ||
1001 get_user(rt.rt_flags, &ur->rt_flags) ||
1002 get_user(rt.rt_metric, &ur->rt_metric) ||
1003 get_user(rt.rt_mtu, &ur->rt_mtu) ||
1004 get_user(rt.rt_window, &ur->rt_window) ||
1005 get_user(rt.rt_irtt, &ur->rt_irtt) ||
1006 get_user(rtdev, &ur->rt_dev))
1007 return -EFAULT;
1008
1009 rt.rt_dev = compat_ptr(rtdev);
1010 return ip_rt_ioctl(sock_net(sk), cmd, &rt);
1011 }
1012
inet_compat_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1013 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1014 {
1015 void __user *argp = compat_ptr(arg);
1016 struct sock *sk = sock->sk;
1017
1018 switch (cmd) {
1019 case SIOCADDRT:
1020 case SIOCDELRT:
1021 return inet_compat_routing_ioctl(sk, cmd, argp);
1022 default:
1023 if (!sk->sk_prot->compat_ioctl)
1024 return -ENOIOCTLCMD;
1025 return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1026 }
1027 }
1028 #endif /* CONFIG_COMPAT */
1029
1030 const struct proto_ops inet_stream_ops = {
1031 .family = PF_INET,
1032 .owner = THIS_MODULE,
1033 .release = inet_release,
1034 .bind = inet_bind,
1035 .connect = inet_stream_connect,
1036 .socketpair = sock_no_socketpair,
1037 .accept = inet_accept,
1038 .getname = inet_getname,
1039 .poll = tcp_poll,
1040 .ioctl = inet_ioctl,
1041 .gettstamp = sock_gettstamp,
1042 .listen = inet_listen,
1043 .shutdown = inet_shutdown,
1044 .setsockopt = sock_common_setsockopt,
1045 .getsockopt = sock_common_getsockopt,
1046 .sendmsg = inet_sendmsg,
1047 .recvmsg = inet_recvmsg,
1048 #ifdef CONFIG_MMU
1049 .mmap = tcp_mmap,
1050 #endif
1051 .sendpage = inet_sendpage,
1052 .splice_read = tcp_splice_read,
1053 .read_sock = tcp_read_sock,
1054 .sendmsg_locked = tcp_sendmsg_locked,
1055 .sendpage_locked = tcp_sendpage_locked,
1056 .peek_len = tcp_peek_len,
1057 #ifdef CONFIG_COMPAT
1058 .compat_ioctl = inet_compat_ioctl,
1059 #endif
1060 .set_rcvlowat = tcp_set_rcvlowat,
1061 };
1062 EXPORT_SYMBOL(inet_stream_ops);
1063
1064 const struct proto_ops inet_dgram_ops = {
1065 .family = PF_INET,
1066 .owner = THIS_MODULE,
1067 .release = inet_release,
1068 .bind = inet_bind,
1069 .connect = inet_dgram_connect,
1070 .socketpair = sock_no_socketpair,
1071 .accept = sock_no_accept,
1072 .getname = inet_getname,
1073 .poll = udp_poll,
1074 .ioctl = inet_ioctl,
1075 .gettstamp = sock_gettstamp,
1076 .listen = sock_no_listen,
1077 .shutdown = inet_shutdown,
1078 .setsockopt = sock_common_setsockopt,
1079 .getsockopt = sock_common_getsockopt,
1080 .sendmsg = inet_sendmsg,
1081 .recvmsg = inet_recvmsg,
1082 .mmap = sock_no_mmap,
1083 .sendpage = inet_sendpage,
1084 .set_peek_off = sk_set_peek_off,
1085 #ifdef CONFIG_COMPAT
1086 .compat_ioctl = inet_compat_ioctl,
1087 #endif
1088 };
1089 EXPORT_SYMBOL(inet_dgram_ops);
1090
1091 /*
1092 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1093 * udp_poll
1094 */
1095 static const struct proto_ops inet_sockraw_ops = {
1096 .family = PF_INET,
1097 .owner = THIS_MODULE,
1098 .release = inet_release,
1099 .bind = inet_bind,
1100 .connect = inet_dgram_connect,
1101 .socketpair = sock_no_socketpair,
1102 .accept = sock_no_accept,
1103 .getname = inet_getname,
1104 .poll = datagram_poll,
1105 .ioctl = inet_ioctl,
1106 .gettstamp = sock_gettstamp,
1107 .listen = sock_no_listen,
1108 .shutdown = inet_shutdown,
1109 .setsockopt = sock_common_setsockopt,
1110 .getsockopt = sock_common_getsockopt,
1111 .sendmsg = inet_sendmsg,
1112 .recvmsg = inet_recvmsg,
1113 .mmap = sock_no_mmap,
1114 .sendpage = inet_sendpage,
1115 #ifdef CONFIG_COMPAT
1116 .compat_ioctl = inet_compat_ioctl,
1117 #endif
1118 };
1119
1120 static const struct net_proto_family inet_family_ops = {
1121 .family = PF_INET,
1122 .create = inet_create,
1123 .owner = THIS_MODULE,
1124 };
1125
1126 /* Upon startup we insert all the elements in inetsw_array[] into
1127 * the linked list inetsw.
1128 */
1129 static struct inet_protosw inetsw_array[] =
1130 {
1131 {
1132 .type = SOCK_STREAM,
1133 .protocol = IPPROTO_TCP,
1134 .prot = &tcp_prot,
1135 .ops = &inet_stream_ops,
1136 .flags = INET_PROTOSW_PERMANENT |
1137 INET_PROTOSW_ICSK,
1138 },
1139
1140 {
1141 .type = SOCK_DGRAM,
1142 .protocol = IPPROTO_UDP,
1143 .prot = &udp_prot,
1144 .ops = &inet_dgram_ops,
1145 .flags = INET_PROTOSW_PERMANENT,
1146 },
1147
1148 {
1149 .type = SOCK_DGRAM,
1150 .protocol = IPPROTO_ICMP,
1151 .prot = &ping_prot,
1152 .ops = &inet_sockraw_ops,
1153 .flags = INET_PROTOSW_REUSE,
1154 },
1155
1156 {
1157 .type = SOCK_RAW,
1158 .protocol = IPPROTO_IP, /* wild card */
1159 .prot = &raw_prot,
1160 .ops = &inet_sockraw_ops,
1161 .flags = INET_PROTOSW_REUSE,
1162 }
1163 };
1164
1165 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1166
inet_register_protosw(struct inet_protosw * p)1167 void inet_register_protosw(struct inet_protosw *p)
1168 {
1169 struct list_head *lh;
1170 struct inet_protosw *answer;
1171 int protocol = p->protocol;
1172 struct list_head *last_perm;
1173
1174 spin_lock_bh(&inetsw_lock);
1175
1176 if (p->type >= SOCK_MAX)
1177 goto out_illegal;
1178
1179 /* If we are trying to override a permanent protocol, bail. */
1180 last_perm = &inetsw[p->type];
1181 list_for_each(lh, &inetsw[p->type]) {
1182 answer = list_entry(lh, struct inet_protosw, list);
1183 /* Check only the non-wild match. */
1184 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1185 break;
1186 if (protocol == answer->protocol)
1187 goto out_permanent;
1188 last_perm = lh;
1189 }
1190
1191 /* Add the new entry after the last permanent entry if any, so that
1192 * the new entry does not override a permanent entry when matched with
1193 * a wild-card protocol. But it is allowed to override any existing
1194 * non-permanent entry. This means that when we remove this entry, the
1195 * system automatically returns to the old behavior.
1196 */
1197 list_add_rcu(&p->list, last_perm);
1198 out:
1199 spin_unlock_bh(&inetsw_lock);
1200
1201 return;
1202
1203 out_permanent:
1204 pr_err("Attempt to override permanent protocol %d\n", protocol);
1205 goto out;
1206
1207 out_illegal:
1208 pr_err("Ignoring attempt to register invalid socket type %d\n",
1209 p->type);
1210 goto out;
1211 }
1212 EXPORT_SYMBOL(inet_register_protosw);
1213
inet_unregister_protosw(struct inet_protosw * p)1214 void inet_unregister_protosw(struct inet_protosw *p)
1215 {
1216 if (INET_PROTOSW_PERMANENT & p->flags) {
1217 pr_err("Attempt to unregister permanent protocol %d\n",
1218 p->protocol);
1219 } else {
1220 spin_lock_bh(&inetsw_lock);
1221 list_del_rcu(&p->list);
1222 spin_unlock_bh(&inetsw_lock);
1223
1224 synchronize_net();
1225 }
1226 }
1227 EXPORT_SYMBOL(inet_unregister_protosw);
1228
inet_sk_reselect_saddr(struct sock * sk)1229 static int inet_sk_reselect_saddr(struct sock *sk)
1230 {
1231 struct inet_sock *inet = inet_sk(sk);
1232 __be32 old_saddr = inet->inet_saddr;
1233 __be32 daddr = inet->inet_daddr;
1234 struct flowi4 *fl4;
1235 struct rtable *rt;
1236 __be32 new_saddr;
1237 struct ip_options_rcu *inet_opt;
1238
1239 inet_opt = rcu_dereference_protected(inet->inet_opt,
1240 lockdep_sock_is_held(sk));
1241 if (inet_opt && inet_opt->opt.srr)
1242 daddr = inet_opt->opt.faddr;
1243
1244 /* Query new route. */
1245 fl4 = &inet->cork.fl.u.ip4;
1246 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1247 sk->sk_bound_dev_if, sk->sk_protocol,
1248 inet->inet_sport, inet->inet_dport, sk);
1249 if (IS_ERR(rt))
1250 return PTR_ERR(rt);
1251
1252 sk_setup_caps(sk, &rt->dst);
1253
1254 new_saddr = fl4->saddr;
1255
1256 if (new_saddr == old_saddr)
1257 return 0;
1258
1259 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1260 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1261 __func__, &old_saddr, &new_saddr);
1262 }
1263
1264 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1265
1266 /*
1267 * XXX The only one ugly spot where we need to
1268 * XXX really change the sockets identity after
1269 * XXX it has entered the hashes. -DaveM
1270 *
1271 * Besides that, it does not check for connection
1272 * uniqueness. Wait for troubles.
1273 */
1274 return __sk_prot_rehash(sk);
1275 }
1276
inet_sk_rebuild_header(struct sock * sk)1277 int inet_sk_rebuild_header(struct sock *sk)
1278 {
1279 struct inet_sock *inet = inet_sk(sk);
1280 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1281 __be32 daddr;
1282 struct ip_options_rcu *inet_opt;
1283 struct flowi4 *fl4;
1284 int err;
1285
1286 /* Route is OK, nothing to do. */
1287 if (rt)
1288 return 0;
1289
1290 /* Reroute. */
1291 rcu_read_lock();
1292 inet_opt = rcu_dereference(inet->inet_opt);
1293 daddr = inet->inet_daddr;
1294 if (inet_opt && inet_opt->opt.srr)
1295 daddr = inet_opt->opt.faddr;
1296 rcu_read_unlock();
1297 fl4 = &inet->cork.fl.u.ip4;
1298 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1299 inet->inet_dport, inet->inet_sport,
1300 sk->sk_protocol, RT_CONN_FLAGS(sk),
1301 sk->sk_bound_dev_if);
1302 if (!IS_ERR(rt)) {
1303 err = 0;
1304 sk_setup_caps(sk, &rt->dst);
1305 } else {
1306 err = PTR_ERR(rt);
1307
1308 /* Routing failed... */
1309 sk->sk_route_caps = 0;
1310 /*
1311 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1312 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1313 */
1314 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1315 sk->sk_state != TCP_SYN_SENT ||
1316 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1317 (err = inet_sk_reselect_saddr(sk)) != 0)
1318 sk->sk_err_soft = -err;
1319 }
1320
1321 return err;
1322 }
1323 EXPORT_SYMBOL(inet_sk_rebuild_header);
1324
inet_sk_set_state(struct sock * sk,int state)1325 void inet_sk_set_state(struct sock *sk, int state)
1326 {
1327 trace_inet_sock_set_state(sk, sk->sk_state, state);
1328 sk->sk_state = state;
1329 }
1330 EXPORT_SYMBOL(inet_sk_set_state);
1331
inet_sk_state_store(struct sock * sk,int newstate)1332 void inet_sk_state_store(struct sock *sk, int newstate)
1333 {
1334 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1335 smp_store_release(&sk->sk_state, newstate);
1336 }
1337
inet_gso_segment(struct sk_buff * skb,netdev_features_t features)1338 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1339 netdev_features_t features)
1340 {
1341 bool udpfrag = false, fixedid = false, gso_partial, encap;
1342 struct sk_buff *segs = ERR_PTR(-EINVAL);
1343 const struct net_offload *ops;
1344 unsigned int offset = 0;
1345 struct iphdr *iph;
1346 int proto, tot_len;
1347 int nhoff;
1348 int ihl;
1349 int id;
1350
1351 skb_reset_network_header(skb);
1352 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1353 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1354 goto out;
1355
1356 iph = ip_hdr(skb);
1357 ihl = iph->ihl * 4;
1358 if (ihl < sizeof(*iph))
1359 goto out;
1360
1361 id = ntohs(iph->id);
1362 proto = iph->protocol;
1363
1364 /* Warning: after this point, iph might be no longer valid */
1365 if (unlikely(!pskb_may_pull(skb, ihl)))
1366 goto out;
1367 __skb_pull(skb, ihl);
1368
1369 encap = SKB_GSO_CB(skb)->encap_level > 0;
1370 if (encap)
1371 features &= skb->dev->hw_enc_features;
1372 SKB_GSO_CB(skb)->encap_level += ihl;
1373
1374 skb_reset_transport_header(skb);
1375
1376 segs = ERR_PTR(-EPROTONOSUPPORT);
1377
1378 if (!skb->encapsulation || encap) {
1379 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1380 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1381
1382 /* fixed ID is invalid if DF bit is not set */
1383 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1384 goto out;
1385 }
1386
1387 ops = rcu_dereference(inet_offloads[proto]);
1388 if (likely(ops && ops->callbacks.gso_segment)) {
1389 segs = ops->callbacks.gso_segment(skb, features);
1390 if (!segs)
1391 skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1392 }
1393
1394 if (IS_ERR_OR_NULL(segs))
1395 goto out;
1396
1397 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1398
1399 skb = segs;
1400 do {
1401 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1402 if (udpfrag) {
1403 iph->frag_off = htons(offset >> 3);
1404 if (skb->next)
1405 iph->frag_off |= htons(IP_MF);
1406 offset += skb->len - nhoff - ihl;
1407 tot_len = skb->len - nhoff;
1408 } else if (skb_is_gso(skb)) {
1409 if (!fixedid) {
1410 iph->id = htons(id);
1411 id += skb_shinfo(skb)->gso_segs;
1412 }
1413
1414 if (gso_partial)
1415 tot_len = skb_shinfo(skb)->gso_size +
1416 SKB_GSO_CB(skb)->data_offset +
1417 skb->head - (unsigned char *)iph;
1418 else
1419 tot_len = skb->len - nhoff;
1420 } else {
1421 if (!fixedid)
1422 iph->id = htons(id++);
1423 tot_len = skb->len - nhoff;
1424 }
1425 iph->tot_len = htons(tot_len);
1426 ip_send_check(iph);
1427 if (encap)
1428 skb_reset_inner_headers(skb);
1429 skb->network_header = (u8 *)iph - skb->head;
1430 skb_reset_mac_len(skb);
1431 } while ((skb = skb->next));
1432
1433 out:
1434 return segs;
1435 }
1436 EXPORT_SYMBOL(inet_gso_segment);
1437
ipip_gso_segment(struct sk_buff * skb,netdev_features_t features)1438 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1439 netdev_features_t features)
1440 {
1441 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1442 return ERR_PTR(-EINVAL);
1443
1444 return inet_gso_segment(skb, features);
1445 }
1446
inet_gro_receive(struct list_head * head,struct sk_buff * skb)1447 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1448 {
1449 const struct net_offload *ops;
1450 struct sk_buff *pp = NULL;
1451 const struct iphdr *iph;
1452 struct sk_buff *p;
1453 unsigned int hlen;
1454 unsigned int off;
1455 unsigned int id;
1456 int flush = 1;
1457 int proto;
1458
1459 off = skb_gro_offset(skb);
1460 hlen = off + sizeof(*iph);
1461 iph = skb_gro_header_fast(skb, off);
1462 if (skb_gro_header_hard(skb, hlen)) {
1463 iph = skb_gro_header_slow(skb, hlen, off);
1464 if (unlikely(!iph))
1465 goto out;
1466 }
1467
1468 proto = iph->protocol;
1469
1470 rcu_read_lock();
1471 ops = rcu_dereference(inet_offloads[proto]);
1472 if (!ops || !ops->callbacks.gro_receive)
1473 goto out_unlock;
1474
1475 if (*(u8 *)iph != 0x45)
1476 goto out_unlock;
1477
1478 if (ip_is_fragment(iph))
1479 goto out_unlock;
1480
1481 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1482 goto out_unlock;
1483
1484 id = ntohl(*(__be32 *)&iph->id);
1485 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1486 id >>= 16;
1487
1488 list_for_each_entry(p, head, list) {
1489 struct iphdr *iph2;
1490 u16 flush_id;
1491
1492 if (!NAPI_GRO_CB(p)->same_flow)
1493 continue;
1494
1495 iph2 = (struct iphdr *)(p->data + off);
1496 /* The above works because, with the exception of the top
1497 * (inner most) layer, we only aggregate pkts with the same
1498 * hdr length so all the hdrs we'll need to verify will start
1499 * at the same offset.
1500 */
1501 if ((iph->protocol ^ iph2->protocol) |
1502 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1503 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1504 NAPI_GRO_CB(p)->same_flow = 0;
1505 continue;
1506 }
1507
1508 /* All fields must match except length and checksum. */
1509 NAPI_GRO_CB(p)->flush |=
1510 (iph->ttl ^ iph2->ttl) |
1511 (iph->tos ^ iph2->tos) |
1512 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1513
1514 NAPI_GRO_CB(p)->flush |= flush;
1515
1516 /* We need to store of the IP ID check to be included later
1517 * when we can verify that this packet does in fact belong
1518 * to a given flow.
1519 */
1520 flush_id = (u16)(id - ntohs(iph2->id));
1521
1522 /* This bit of code makes it much easier for us to identify
1523 * the cases where we are doing atomic vs non-atomic IP ID
1524 * checks. Specifically an atomic check can return IP ID
1525 * values 0 - 0xFFFF, while a non-atomic check can only
1526 * return 0 or 0xFFFF.
1527 */
1528 if (!NAPI_GRO_CB(p)->is_atomic ||
1529 !(iph->frag_off & htons(IP_DF))) {
1530 flush_id ^= NAPI_GRO_CB(p)->count;
1531 flush_id = flush_id ? 0xFFFF : 0;
1532 }
1533
1534 /* If the previous IP ID value was based on an atomic
1535 * datagram we can overwrite the value and ignore it.
1536 */
1537 if (NAPI_GRO_CB(skb)->is_atomic)
1538 NAPI_GRO_CB(p)->flush_id = flush_id;
1539 else
1540 NAPI_GRO_CB(p)->flush_id |= flush_id;
1541 }
1542
1543 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1544 NAPI_GRO_CB(skb)->flush |= flush;
1545 skb_set_network_header(skb, off);
1546 /* The above will be needed by the transport layer if there is one
1547 * immediately following this IP hdr.
1548 */
1549
1550 /* Note : No need to call skb_gro_postpull_rcsum() here,
1551 * as we already checked checksum over ipv4 header was 0
1552 */
1553 skb_gro_pull(skb, sizeof(*iph));
1554 skb_set_transport_header(skb, skb_gro_offset(skb));
1555
1556 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1557 ops->callbacks.gro_receive, head, skb);
1558
1559 out_unlock:
1560 rcu_read_unlock();
1561
1562 out:
1563 skb_gro_flush_final(skb, pp, flush);
1564
1565 return pp;
1566 }
1567 EXPORT_SYMBOL(inet_gro_receive);
1568
ipip_gro_receive(struct list_head * head,struct sk_buff * skb)1569 static struct sk_buff *ipip_gro_receive(struct list_head *head,
1570 struct sk_buff *skb)
1571 {
1572 if (NAPI_GRO_CB(skb)->encap_mark) {
1573 NAPI_GRO_CB(skb)->flush = 1;
1574 return NULL;
1575 }
1576
1577 NAPI_GRO_CB(skb)->encap_mark = 1;
1578
1579 return inet_gro_receive(head, skb);
1580 }
1581
1582 #define SECONDS_PER_DAY 86400
1583
1584 /* inet_current_timestamp - Return IP network timestamp
1585 *
1586 * Return milliseconds since midnight in network byte order.
1587 */
inet_current_timestamp(void)1588 __be32 inet_current_timestamp(void)
1589 {
1590 u32 secs;
1591 u32 msecs;
1592 struct timespec64 ts;
1593
1594 ktime_get_real_ts64(&ts);
1595
1596 /* Get secs since midnight. */
1597 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1598 /* Convert to msecs. */
1599 msecs = secs * MSEC_PER_SEC;
1600 /* Convert nsec to msec. */
1601 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1602
1603 /* Convert to network byte order. */
1604 return htonl(msecs);
1605 }
1606 EXPORT_SYMBOL(inet_current_timestamp);
1607
inet_recv_error(struct sock * sk,struct msghdr * msg,int len,int * addr_len)1608 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1609 {
1610 if (sk->sk_family == AF_INET)
1611 return ip_recv_error(sk, msg, len, addr_len);
1612 #if IS_ENABLED(CONFIG_IPV6)
1613 if (sk->sk_family == AF_INET6)
1614 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1615 #endif
1616 return -EINVAL;
1617 }
1618
inet_gro_complete(struct sk_buff * skb,int nhoff)1619 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1620 {
1621 __be16 newlen = htons(skb->len - nhoff);
1622 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1623 const struct net_offload *ops;
1624 int proto = iph->protocol;
1625 int err = -ENOSYS;
1626
1627 if (skb->encapsulation) {
1628 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1629 skb_set_inner_network_header(skb, nhoff);
1630 }
1631
1632 csum_replace2(&iph->check, iph->tot_len, newlen);
1633 iph->tot_len = newlen;
1634
1635 rcu_read_lock();
1636 ops = rcu_dereference(inet_offloads[proto]);
1637 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1638 goto out_unlock;
1639
1640 /* Only need to add sizeof(*iph) to get to the next hdr below
1641 * because any hdr with option will have been flushed in
1642 * inet_gro_receive().
1643 */
1644 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1645 tcp4_gro_complete, udp4_gro_complete,
1646 skb, nhoff + sizeof(*iph));
1647
1648 out_unlock:
1649 rcu_read_unlock();
1650
1651 return err;
1652 }
1653 EXPORT_SYMBOL(inet_gro_complete);
1654
ipip_gro_complete(struct sk_buff * skb,int nhoff)1655 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1656 {
1657 skb->encapsulation = 1;
1658 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1659 return inet_gro_complete(skb, nhoff);
1660 }
1661
inet_ctl_sock_create(struct sock ** sk,unsigned short family,unsigned short type,unsigned char protocol,struct net * net)1662 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1663 unsigned short type, unsigned char protocol,
1664 struct net *net)
1665 {
1666 struct socket *sock;
1667 int rc = sock_create_kern(net, family, type, protocol, &sock);
1668
1669 if (rc == 0) {
1670 *sk = sock->sk;
1671 (*sk)->sk_allocation = GFP_ATOMIC;
1672 /*
1673 * Unhash it so that IP input processing does not even see it,
1674 * we do not wish this socket to see incoming packets.
1675 */
1676 (*sk)->sk_prot->unhash(*sk);
1677 }
1678 return rc;
1679 }
1680 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1681
snmp_get_cpu_field(void __percpu * mib,int cpu,int offt)1682 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1683 {
1684 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1685 }
1686 EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1687
snmp_fold_field(void __percpu * mib,int offt)1688 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1689 {
1690 unsigned long res = 0;
1691 int i;
1692
1693 for_each_possible_cpu(i)
1694 res += snmp_get_cpu_field(mib, i, offt);
1695 return res;
1696 }
1697 EXPORT_SYMBOL_GPL(snmp_fold_field);
1698
1699 #if BITS_PER_LONG==32
1700
snmp_get_cpu_field64(void __percpu * mib,int cpu,int offt,size_t syncp_offset)1701 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1702 size_t syncp_offset)
1703 {
1704 void *bhptr;
1705 struct u64_stats_sync *syncp;
1706 u64 v;
1707 unsigned int start;
1708
1709 bhptr = per_cpu_ptr(mib, cpu);
1710 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1711 do {
1712 start = u64_stats_fetch_begin_irq(syncp);
1713 v = *(((u64 *)bhptr) + offt);
1714 } while (u64_stats_fetch_retry_irq(syncp, start));
1715
1716 return v;
1717 }
1718 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1719
snmp_fold_field64(void __percpu * mib,int offt,size_t syncp_offset)1720 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1721 {
1722 u64 res = 0;
1723 int cpu;
1724
1725 for_each_possible_cpu(cpu) {
1726 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1727 }
1728 return res;
1729 }
1730 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1731 #endif
1732
1733 #ifdef CONFIG_IP_MULTICAST
1734 static const struct net_protocol igmp_protocol = {
1735 .handler = igmp_rcv,
1736 .netns_ok = 1,
1737 };
1738 #endif
1739
1740 static const struct net_protocol tcp_protocol = {
1741 .handler = tcp_v4_rcv,
1742 .err_handler = tcp_v4_err,
1743 .no_policy = 1,
1744 .netns_ok = 1,
1745 .icmp_strict_tag_validation = 1,
1746 };
1747
1748 static const struct net_protocol udp_protocol = {
1749 .handler = udp_rcv,
1750 .err_handler = udp_err,
1751 .no_policy = 1,
1752 .netns_ok = 1,
1753 };
1754
1755 static const struct net_protocol icmp_protocol = {
1756 .handler = icmp_rcv,
1757 .err_handler = icmp_err,
1758 .no_policy = 1,
1759 .netns_ok = 1,
1760 };
1761
ipv4_mib_init_net(struct net * net)1762 static __net_init int ipv4_mib_init_net(struct net *net)
1763 {
1764 int i;
1765
1766 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1767 if (!net->mib.tcp_statistics)
1768 goto err_tcp_mib;
1769 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1770 if (!net->mib.ip_statistics)
1771 goto err_ip_mib;
1772
1773 for_each_possible_cpu(i) {
1774 struct ipstats_mib *af_inet_stats;
1775 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1776 u64_stats_init(&af_inet_stats->syncp);
1777 }
1778
1779 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1780 if (!net->mib.net_statistics)
1781 goto err_net_mib;
1782 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1783 if (!net->mib.udp_statistics)
1784 goto err_udp_mib;
1785 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1786 if (!net->mib.udplite_statistics)
1787 goto err_udplite_mib;
1788 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1789 if (!net->mib.icmp_statistics)
1790 goto err_icmp_mib;
1791 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1792 GFP_KERNEL);
1793 if (!net->mib.icmpmsg_statistics)
1794 goto err_icmpmsg_mib;
1795
1796 tcp_mib_init(net);
1797 return 0;
1798
1799 err_icmpmsg_mib:
1800 free_percpu(net->mib.icmp_statistics);
1801 err_icmp_mib:
1802 free_percpu(net->mib.udplite_statistics);
1803 err_udplite_mib:
1804 free_percpu(net->mib.udp_statistics);
1805 err_udp_mib:
1806 free_percpu(net->mib.net_statistics);
1807 err_net_mib:
1808 free_percpu(net->mib.ip_statistics);
1809 err_ip_mib:
1810 free_percpu(net->mib.tcp_statistics);
1811 err_tcp_mib:
1812 return -ENOMEM;
1813 }
1814
ipv4_mib_exit_net(struct net * net)1815 static __net_exit void ipv4_mib_exit_net(struct net *net)
1816 {
1817 kfree(net->mib.icmpmsg_statistics);
1818 free_percpu(net->mib.icmp_statistics);
1819 free_percpu(net->mib.udplite_statistics);
1820 free_percpu(net->mib.udp_statistics);
1821 free_percpu(net->mib.net_statistics);
1822 free_percpu(net->mib.ip_statistics);
1823 free_percpu(net->mib.tcp_statistics);
1824 #ifdef CONFIG_MPTCP
1825 /* allocated on demand, see mptcp_init_sock() */
1826 free_percpu(net->mib.mptcp_statistics);
1827 #endif
1828 }
1829
1830 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1831 .init = ipv4_mib_init_net,
1832 .exit = ipv4_mib_exit_net,
1833 };
1834
init_ipv4_mibs(void)1835 static int __init init_ipv4_mibs(void)
1836 {
1837 return register_pernet_subsys(&ipv4_mib_ops);
1838 }
1839
inet_init_net(struct net * net)1840 static __net_init int inet_init_net(struct net *net)
1841 {
1842 /*
1843 * Set defaults for local port range
1844 */
1845 seqlock_init(&net->ipv4.ip_local_ports.lock);
1846 net->ipv4.ip_local_ports.range[0] = 32768;
1847 net->ipv4.ip_local_ports.range[1] = 60999;
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 return 0;
1879 }
1880
1881 static __net_initdata struct pernet_operations af_inet_ops = {
1882 .init = inet_init_net,
1883 };
1884
init_inet_pernet_ops(void)1885 static int __init init_inet_pernet_ops(void)
1886 {
1887 return register_pernet_subsys(&af_inet_ops);
1888 }
1889
1890 static int ipv4_proc_init(void);
1891
1892 /*
1893 * IP protocol layer initialiser
1894 */
1895
1896 static struct packet_offload ip_packet_offload __read_mostly = {
1897 .type = cpu_to_be16(ETH_P_IP),
1898 .callbacks = {
1899 .gso_segment = inet_gso_segment,
1900 .gro_receive = inet_gro_receive,
1901 .gro_complete = inet_gro_complete,
1902 },
1903 };
1904
1905 static const struct net_offload ipip_offload = {
1906 .callbacks = {
1907 .gso_segment = ipip_gso_segment,
1908 .gro_receive = ipip_gro_receive,
1909 .gro_complete = ipip_gro_complete,
1910 },
1911 };
1912
ipip_offload_init(void)1913 static int __init ipip_offload_init(void)
1914 {
1915 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1916 }
1917
ipv4_offload_init(void)1918 static int __init ipv4_offload_init(void)
1919 {
1920 /*
1921 * Add offloads
1922 */
1923 if (udpv4_offload_init() < 0)
1924 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1925 if (tcpv4_offload_init() < 0)
1926 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1927 if (ipip_offload_init() < 0)
1928 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1929
1930 dev_add_offload(&ip_packet_offload);
1931 return 0;
1932 }
1933
1934 fs_initcall(ipv4_offload_init);
1935
1936 static struct packet_type ip_packet_type __read_mostly = {
1937 .type = cpu_to_be16(ETH_P_IP),
1938 .func = ip_rcv,
1939 .list_func = ip_list_rcv,
1940 };
1941
inet_init(void)1942 static int __init inet_init(void)
1943 {
1944 struct inet_protosw *q;
1945 struct list_head *r;
1946 int rc;
1947
1948 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1949
1950 rc = proto_register(&tcp_prot, 1);
1951 if (rc)
1952 goto out;
1953
1954 rc = proto_register(&udp_prot, 1);
1955 if (rc)
1956 goto out_unregister_tcp_proto;
1957
1958 rc = proto_register(&raw_prot, 1);
1959 if (rc)
1960 goto out_unregister_udp_proto;
1961
1962 rc = proto_register(&ping_prot, 1);
1963 if (rc)
1964 goto out_unregister_raw_proto;
1965
1966 /*
1967 * Tell SOCKET that we are alive...
1968 */
1969
1970 (void)sock_register(&inet_family_ops);
1971
1972 #ifdef CONFIG_SYSCTL
1973 ip_static_sysctl_init();
1974 #endif
1975
1976 /*
1977 * Add all the base protocols.
1978 */
1979
1980 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1981 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1982 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1983 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1984 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1985 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1986 #ifdef CONFIG_IP_MULTICAST
1987 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1988 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1989 #endif
1990
1991 /* Register the socket-side information for inet_create. */
1992 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1993 INIT_LIST_HEAD(r);
1994
1995 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1996 inet_register_protosw(q);
1997
1998 /*
1999 * Set the ARP module up
2000 */
2001
2002 arp_init();
2003
2004 /*
2005 * Set the IP module up
2006 */
2007
2008 ip_init();
2009
2010 /* Initialise per-cpu ipv4 mibs */
2011 if (init_ipv4_mibs())
2012 panic("%s: Cannot init ipv4 mibs\n", __func__);
2013
2014 /* Setup TCP slab cache for open requests. */
2015 tcp_init();
2016
2017 /* Setup UDP memory threshold */
2018 udp_init();
2019
2020 /* Add UDP-Lite (RFC 3828) */
2021 udplite4_register();
2022
2023 raw_init();
2024
2025 ping_init();
2026
2027 /*
2028 * Set the ICMP layer up
2029 */
2030
2031 if (icmp_init() < 0)
2032 panic("Failed to create the ICMP control socket.\n");
2033
2034 /*
2035 * Initialise the multicast router
2036 */
2037 #if defined(CONFIG_IP_MROUTE)
2038 if (ip_mr_init())
2039 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2040 #endif
2041
2042 if (init_inet_pernet_ops())
2043 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2044
2045 ipv4_proc_init();
2046
2047 ipfrag_init();
2048
2049 dev_add_pack(&ip_packet_type);
2050
2051 ip_tunnel_core_init();
2052
2053 rc = 0;
2054 out:
2055 return rc;
2056 out_unregister_raw_proto:
2057 proto_unregister(&raw_prot);
2058 out_unregister_udp_proto:
2059 proto_unregister(&udp_prot);
2060 out_unregister_tcp_proto:
2061 proto_unregister(&tcp_prot);
2062 goto out;
2063 }
2064
2065 fs_initcall(inet_init);
2066
2067 /* ------------------------------------------------------------------------ */
2068
2069 #ifdef CONFIG_PROC_FS
ipv4_proc_init(void)2070 static int __init ipv4_proc_init(void)
2071 {
2072 int rc = 0;
2073
2074 if (raw_proc_init())
2075 goto out_raw;
2076 if (tcp4_proc_init())
2077 goto out_tcp;
2078 if (udp4_proc_init())
2079 goto out_udp;
2080 if (ping_proc_init())
2081 goto out_ping;
2082 if (ip_misc_proc_init())
2083 goto out_misc;
2084 out:
2085 return rc;
2086 out_misc:
2087 ping_proc_exit();
2088 out_ping:
2089 udp4_proc_exit();
2090 out_udp:
2091 tcp4_proc_exit();
2092 out_tcp:
2093 raw_proc_exit();
2094 out_raw:
2095 rc = -ENOMEM;
2096 goto out;
2097 }
2098
2099 #else /* CONFIG_PROC_FS */
ipv4_proc_init(void)2100 static int __init ipv4_proc_init(void)
2101 {
2102 return 0;
2103 }
2104 #endif /* CONFIG_PROC_FS */
2105