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(sk->sk_rx_dst);
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 = 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 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 }
394 out:
395 return err;
396 out_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 */
inet_release(struct socket * sock)407 int 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 }
436 EXPORT_SYMBOL(inet_release);
437
inet_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)438 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
439 {
440 struct sock *sk = sock->sk;
441 int err;
442
443 /* If the socket has its own bind function then use it. (RAW) */
444 if (sk->sk_prot->bind) {
445 return sk->sk_prot->bind(sk, uaddr, addr_len);
446 }
447 if (addr_len < sizeof(struct sockaddr_in))
448 return -EINVAL;
449
450 /* BPF prog is run before any checks are done so that if the prog
451 * changes context in a wrong way it will be caught.
452 */
453 err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr);
454 if (err)
455 return err;
456
457 return __inet_bind(sk, uaddr, addr_len, BIND_WITH_LOCK);
458 }
459 EXPORT_SYMBOL(inet_bind);
460
__inet_bind(struct sock * sk,struct sockaddr * uaddr,int addr_len,u32 flags)461 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
462 u32 flags)
463 {
464 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
465 struct inet_sock *inet = inet_sk(sk);
466 struct net *net = sock_net(sk);
467 unsigned short snum;
468 int chk_addr_ret;
469 u32 tb_id = RT_TABLE_LOCAL;
470 int err;
471
472 if (addr->sin_family != AF_INET) {
473 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
474 * only if s_addr is INADDR_ANY.
475 */
476 err = -EAFNOSUPPORT;
477 if (addr->sin_family != AF_UNSPEC ||
478 addr->sin_addr.s_addr != htonl(INADDR_ANY))
479 goto out;
480 }
481
482 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
483 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
484
485 /* Not specified by any standard per-se, however it breaks too
486 * many applications when removed. It is unfortunate since
487 * allowing applications to make a non-local bind solves
488 * several problems with systems using dynamic addressing.
489 * (ie. your servers still start up even if your ISDN link
490 * is temporarily down)
491 */
492 err = -EADDRNOTAVAIL;
493 if (!inet_can_nonlocal_bind(net, inet) &&
494 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
495 chk_addr_ret != RTN_LOCAL &&
496 chk_addr_ret != RTN_MULTICAST &&
497 chk_addr_ret != RTN_BROADCAST)
498 goto out;
499
500 snum = ntohs(addr->sin_port);
501 err = -EACCES;
502 if (snum && inet_port_requires_bind_service(net, snum) &&
503 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
504 goto out;
505
506 /* We keep a pair of addresses. rcv_saddr is the one
507 * used by hash lookups, and saddr is used for transmit.
508 *
509 * In the BSD API these are the same except where it
510 * would be illegal to use them (multicast/broadcast) in
511 * which case the sending device address is used.
512 */
513 if (flags & BIND_WITH_LOCK)
514 lock_sock(sk);
515
516 /* Check these errors (active socket, double bind). */
517 err = -EINVAL;
518 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
519 goto out_release_sock;
520
521 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
522 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
523 inet->inet_saddr = 0; /* Use device */
524
525 /* Make sure we are allowed to bind here. */
526 if (snum || !(inet->bind_address_no_port ||
527 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
528 if (sk->sk_prot->get_port(sk, snum)) {
529 inet->inet_saddr = inet->inet_rcv_saddr = 0;
530 err = -EADDRINUSE;
531 goto out_release_sock;
532 }
533 if (!(flags & BIND_FROM_BPF)) {
534 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
535 if (err) {
536 inet->inet_saddr = inet->inet_rcv_saddr = 0;
537 goto out_release_sock;
538 }
539 }
540 }
541
542 if (inet->inet_rcv_saddr)
543 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
544 if (snum)
545 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
546 inet->inet_sport = htons(inet->inet_num);
547 inet->inet_daddr = 0;
548 inet->inet_dport = 0;
549 sk_dst_reset(sk);
550 err = 0;
551 out_release_sock:
552 if (flags & BIND_WITH_LOCK)
553 release_sock(sk);
554 out:
555 return err;
556 }
557
inet_dgram_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)558 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
559 int addr_len, int flags)
560 {
561 struct sock *sk = sock->sk;
562 int err;
563
564 if (addr_len < sizeof(uaddr->sa_family))
565 return -EINVAL;
566 if (uaddr->sa_family == AF_UNSPEC)
567 return sk->sk_prot->disconnect(sk, flags);
568
569 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
570 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
571 if (err)
572 return err;
573 }
574
575 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
576 return -EAGAIN;
577 return sk->sk_prot->connect(sk, uaddr, addr_len);
578 }
579 EXPORT_SYMBOL(inet_dgram_connect);
580
inet_wait_for_connect(struct sock * sk,long timeo,int writebias)581 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
582 {
583 DEFINE_WAIT_FUNC(wait, woken_wake_function);
584
585 add_wait_queue(sk_sleep(sk), &wait);
586 sk->sk_write_pending += writebias;
587
588 /* Basic assumption: if someone sets sk->sk_err, he _must_
589 * change state of the socket from TCP_SYN_*.
590 * Connect() does not allow to get error notifications
591 * without closing the socket.
592 */
593 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
594 release_sock(sk);
595 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
596 lock_sock(sk);
597 if (signal_pending(current) || !timeo)
598 break;
599 }
600 remove_wait_queue(sk_sleep(sk), &wait);
601 sk->sk_write_pending -= writebias;
602 return timeo;
603 }
604
605 /*
606 * Connect to a remote host. There is regrettably still a little
607 * TCP 'magic' in here.
608 */
__inet_stream_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags,int is_sendmsg)609 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
610 int addr_len, int flags, int is_sendmsg)
611 {
612 struct sock *sk = sock->sk;
613 int err;
614 long timeo;
615
616 /*
617 * uaddr can be NULL and addr_len can be 0 if:
618 * sk is a TCP fastopen active socket and
619 * TCP_FASTOPEN_CONNECT sockopt is set and
620 * we already have a valid cookie for this socket.
621 * In this case, user can call write() after connect().
622 * write() will invoke tcp_sendmsg_fastopen() which calls
623 * __inet_stream_connect().
624 */
625 if (uaddr) {
626 if (addr_len < sizeof(uaddr->sa_family))
627 return -EINVAL;
628
629 if (uaddr->sa_family == AF_UNSPEC) {
630 err = sk->sk_prot->disconnect(sk, flags);
631 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
632 goto out;
633 }
634 }
635
636 switch (sock->state) {
637 default:
638 err = -EINVAL;
639 goto out;
640 case SS_CONNECTED:
641 err = -EISCONN;
642 goto out;
643 case SS_CONNECTING:
644 if (inet_sk(sk)->defer_connect)
645 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
646 else
647 err = -EALREADY;
648 /* Fall out of switch with err, set for this state */
649 break;
650 case SS_UNCONNECTED:
651 err = -EISCONN;
652 if (sk->sk_state != TCP_CLOSE)
653 goto out;
654
655 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
656 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
657 if (err)
658 goto out;
659 }
660
661 err = sk->sk_prot->connect(sk, uaddr, addr_len);
662 if (err < 0)
663 goto out;
664
665 sock->state = SS_CONNECTING;
666
667 if (!err && inet_sk(sk)->defer_connect)
668 goto out;
669
670 /* Just entered SS_CONNECTING state; the only
671 * difference is that return value in non-blocking
672 * case is EINPROGRESS, rather than EALREADY.
673 */
674 err = -EINPROGRESS;
675 break;
676 }
677
678 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
679
680 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
681 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
682 tcp_sk(sk)->fastopen_req &&
683 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
684
685 /* Error code is set above */
686 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
687 goto out;
688
689 err = sock_intr_errno(timeo);
690 if (signal_pending(current))
691 goto out;
692 }
693
694 /* Connection was closed by RST, timeout, ICMP error
695 * or another process disconnected us.
696 */
697 if (sk->sk_state == TCP_CLOSE)
698 goto sock_error;
699
700 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
701 * and error was received after socket entered established state.
702 * Hence, it is handled normally after connect() return successfully.
703 */
704
705 sock->state = SS_CONNECTED;
706 err = 0;
707 out:
708 return err;
709
710 sock_error:
711 err = sock_error(sk) ? : -ECONNABORTED;
712 sock->state = SS_UNCONNECTED;
713 if (sk->sk_prot->disconnect(sk, flags))
714 sock->state = SS_DISCONNECTING;
715 goto out;
716 }
717 EXPORT_SYMBOL(__inet_stream_connect);
718
inet_stream_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)719 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
720 int addr_len, int flags)
721 {
722 int err;
723
724 lock_sock(sock->sk);
725 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
726 release_sock(sock->sk);
727 return err;
728 }
729 EXPORT_SYMBOL(inet_stream_connect);
730
731 /*
732 * Accept a pending connection. The TCP layer now gives BSD semantics.
733 */
734
inet_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)735 int inet_accept(struct socket *sock, struct socket *newsock, int flags,
736 bool kern)
737 {
738 struct sock *sk1 = sock->sk;
739 int err = -EINVAL;
740 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
741
742 if (!sk2)
743 goto do_err;
744
745 lock_sock(sk2);
746
747 sock_rps_record_flow(sk2);
748 WARN_ON(!((1 << sk2->sk_state) &
749 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
750 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
751
752 sock_graft(sk2, newsock);
753
754 newsock->state = SS_CONNECTED;
755 err = 0;
756 release_sock(sk2);
757 do_err:
758 return err;
759 }
760 EXPORT_SYMBOL(inet_accept);
761
762 /*
763 * This does both peername and sockname.
764 */
inet_getname(struct socket * sock,struct sockaddr * uaddr,int peer)765 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
766 int peer)
767 {
768 struct sock *sk = sock->sk;
769 struct inet_sock *inet = inet_sk(sk);
770 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
771
772 sin->sin_family = AF_INET;
773 if (peer) {
774 if (!inet->inet_dport ||
775 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
776 peer == 1))
777 return -ENOTCONN;
778 sin->sin_port = inet->inet_dport;
779 sin->sin_addr.s_addr = inet->inet_daddr;
780 } else {
781 __be32 addr = inet->inet_rcv_saddr;
782 if (!addr)
783 addr = inet->inet_saddr;
784 sin->sin_port = inet->inet_sport;
785 sin->sin_addr.s_addr = addr;
786 }
787 if (cgroup_bpf_enabled)
788 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
789 peer ? BPF_CGROUP_INET4_GETPEERNAME :
790 BPF_CGROUP_INET4_GETSOCKNAME,
791 NULL);
792 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
793 return sizeof(*sin);
794 }
795 EXPORT_SYMBOL(inet_getname);
796
inet_send_prepare(struct sock * sk)797 int inet_send_prepare(struct sock *sk)
798 {
799 sock_rps_record_flow(sk);
800
801 /* We may need to bind the socket. */
802 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
803 inet_autobind(sk))
804 return -EAGAIN;
805
806 return 0;
807 }
808 EXPORT_SYMBOL_GPL(inet_send_prepare);
809
inet_sendmsg(struct socket * sock,struct msghdr * msg,size_t size)810 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
811 {
812 struct sock *sk = sock->sk;
813
814 if (unlikely(inet_send_prepare(sk)))
815 return -EAGAIN;
816
817 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
818 sk, msg, size);
819 }
820 EXPORT_SYMBOL(inet_sendmsg);
821
inet_sendpage(struct socket * sock,struct page * page,int offset,size_t size,int flags)822 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
823 size_t size, int flags)
824 {
825 struct sock *sk = sock->sk;
826
827 if (unlikely(inet_send_prepare(sk)))
828 return -EAGAIN;
829
830 if (sk->sk_prot->sendpage)
831 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
832 return sock_no_sendpage(sock, page, offset, size, flags);
833 }
834 EXPORT_SYMBOL(inet_sendpage);
835
836 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
837 size_t, int, int, int *));
inet_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)838 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
839 int flags)
840 {
841 struct sock *sk = sock->sk;
842 int addr_len = 0;
843 int err;
844
845 if (likely(!(flags & MSG_ERRQUEUE)))
846 sock_rps_record_flow(sk);
847
848 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
849 sk, msg, size, flags & MSG_DONTWAIT,
850 flags & ~MSG_DONTWAIT, &addr_len);
851 if (err >= 0)
852 msg->msg_namelen = addr_len;
853 return err;
854 }
855 EXPORT_SYMBOL(inet_recvmsg);
856
inet_shutdown(struct socket * sock,int how)857 int inet_shutdown(struct socket *sock, int how)
858 {
859 struct sock *sk = sock->sk;
860 int err = 0;
861
862 /* This should really check to make sure
863 * the socket is a TCP socket. (WHY AC...)
864 */
865 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
866 1->2 bit 2 snds.
867 2->3 */
868 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
869 return -EINVAL;
870
871 lock_sock(sk);
872 if (sock->state == SS_CONNECTING) {
873 if ((1 << sk->sk_state) &
874 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
875 sock->state = SS_DISCONNECTING;
876 else
877 sock->state = SS_CONNECTED;
878 }
879
880 switch (sk->sk_state) {
881 case TCP_CLOSE:
882 err = -ENOTCONN;
883 /* Hack to wake up other listeners, who can poll for
884 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
885 fallthrough;
886 default:
887 sk->sk_shutdown |= how;
888 if (sk->sk_prot->shutdown)
889 sk->sk_prot->shutdown(sk, how);
890 break;
891
892 /* Remaining two branches are temporary solution for missing
893 * close() in multithreaded environment. It is _not_ a good idea,
894 * but we have no choice until close() is repaired at VFS level.
895 */
896 case TCP_LISTEN:
897 if (!(how & RCV_SHUTDOWN))
898 break;
899 fallthrough;
900 case TCP_SYN_SENT:
901 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
902 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
903 break;
904 }
905
906 /* Wake up anyone sleeping in poll. */
907 sk->sk_state_change(sk);
908 release_sock(sk);
909 return err;
910 }
911 EXPORT_SYMBOL(inet_shutdown);
912
913 /*
914 * ioctl() calls you can issue on an INET socket. Most of these are
915 * device configuration and stuff and very rarely used. Some ioctls
916 * pass on to the socket itself.
917 *
918 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
919 * loads the devconfigure module does its configuring and unloads it.
920 * There's a good 20K of config code hanging around the kernel.
921 */
922
inet_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)923 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
924 {
925 struct sock *sk = sock->sk;
926 int err = 0;
927 struct net *net = sock_net(sk);
928 void __user *p = (void __user *)arg;
929 struct ifreq ifr;
930 struct rtentry rt;
931
932 switch (cmd) {
933 case SIOCADDRT:
934 case SIOCDELRT:
935 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
936 return -EFAULT;
937 err = ip_rt_ioctl(net, cmd, &rt);
938 break;
939 case SIOCRTMSG:
940 err = -EINVAL;
941 break;
942 case SIOCDARP:
943 case SIOCGARP:
944 case SIOCSARP:
945 err = arp_ioctl(net, cmd, (void __user *)arg);
946 break;
947 case SIOCGIFADDR:
948 case SIOCGIFBRDADDR:
949 case SIOCGIFNETMASK:
950 case SIOCGIFDSTADDR:
951 case SIOCGIFPFLAGS:
952 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
953 return -EFAULT;
954 err = devinet_ioctl(net, cmd, &ifr);
955 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
956 err = -EFAULT;
957 break;
958
959 case SIOCSIFADDR:
960 case SIOCSIFBRDADDR:
961 case SIOCSIFNETMASK:
962 case SIOCSIFDSTADDR:
963 case SIOCSIFPFLAGS:
964 case SIOCSIFFLAGS:
965 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
966 return -EFAULT;
967 err = devinet_ioctl(net, cmd, &ifr);
968 break;
969 default:
970 if (sk->sk_prot->ioctl)
971 err = sk->sk_prot->ioctl(sk, cmd, arg);
972 else
973 err = -ENOIOCTLCMD;
974 break;
975 }
976 return err;
977 }
978 EXPORT_SYMBOL(inet_ioctl);
979
980 #ifdef CONFIG_COMPAT
inet_compat_routing_ioctl(struct sock * sk,unsigned int cmd,struct compat_rtentry __user * ur)981 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
982 struct compat_rtentry __user *ur)
983 {
984 compat_uptr_t rtdev;
985 struct rtentry rt;
986
987 if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
988 3 * sizeof(struct sockaddr)) ||
989 get_user(rt.rt_flags, &ur->rt_flags) ||
990 get_user(rt.rt_metric, &ur->rt_metric) ||
991 get_user(rt.rt_mtu, &ur->rt_mtu) ||
992 get_user(rt.rt_window, &ur->rt_window) ||
993 get_user(rt.rt_irtt, &ur->rt_irtt) ||
994 get_user(rtdev, &ur->rt_dev))
995 return -EFAULT;
996
997 rt.rt_dev = compat_ptr(rtdev);
998 return ip_rt_ioctl(sock_net(sk), cmd, &rt);
999 }
1000
inet_compat_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1001 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1002 {
1003 void __user *argp = compat_ptr(arg);
1004 struct sock *sk = sock->sk;
1005
1006 switch (cmd) {
1007 case SIOCADDRT:
1008 case SIOCDELRT:
1009 return inet_compat_routing_ioctl(sk, cmd, argp);
1010 default:
1011 if (!sk->sk_prot->compat_ioctl)
1012 return -ENOIOCTLCMD;
1013 return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1014 }
1015 }
1016 #endif /* CONFIG_COMPAT */
1017
1018 const struct proto_ops inet_stream_ops = {
1019 .family = PF_INET,
1020 .flags = PROTO_CMSG_DATA_ONLY,
1021 .owner = THIS_MODULE,
1022 .release = inet_release,
1023 .bind = inet_bind,
1024 .connect = inet_stream_connect,
1025 .socketpair = sock_no_socketpair,
1026 .accept = inet_accept,
1027 .getname = inet_getname,
1028 .poll = tcp_poll,
1029 .ioctl = inet_ioctl,
1030 .gettstamp = sock_gettstamp,
1031 .listen = inet_listen,
1032 .shutdown = inet_shutdown,
1033 .setsockopt = sock_common_setsockopt,
1034 .getsockopt = sock_common_getsockopt,
1035 .sendmsg = inet_sendmsg,
1036 .recvmsg = inet_recvmsg,
1037 #ifdef CONFIG_MMU
1038 .mmap = tcp_mmap,
1039 #endif
1040 .sendpage = inet_sendpage,
1041 .splice_read = tcp_splice_read,
1042 .read_sock = tcp_read_sock,
1043 .sendmsg_locked = tcp_sendmsg_locked,
1044 .sendpage_locked = tcp_sendpage_locked,
1045 .peek_len = tcp_peek_len,
1046 #ifdef CONFIG_COMPAT
1047 .compat_ioctl = inet_compat_ioctl,
1048 #endif
1049 .set_rcvlowat = tcp_set_rcvlowat,
1050 };
1051 EXPORT_SYMBOL(inet_stream_ops);
1052
1053 const struct proto_ops inet_dgram_ops = {
1054 .family = PF_INET,
1055 .owner = THIS_MODULE,
1056 .release = inet_release,
1057 .bind = inet_bind,
1058 .connect = inet_dgram_connect,
1059 .socketpair = sock_no_socketpair,
1060 .accept = sock_no_accept,
1061 .getname = inet_getname,
1062 .poll = udp_poll,
1063 .ioctl = inet_ioctl,
1064 .gettstamp = sock_gettstamp,
1065 .listen = sock_no_listen,
1066 .shutdown = inet_shutdown,
1067 .setsockopt = sock_common_setsockopt,
1068 .getsockopt = sock_common_getsockopt,
1069 .sendmsg = inet_sendmsg,
1070 .recvmsg = inet_recvmsg,
1071 .mmap = sock_no_mmap,
1072 .sendpage = inet_sendpage,
1073 .set_peek_off = sk_set_peek_off,
1074 #ifdef CONFIG_COMPAT
1075 .compat_ioctl = inet_compat_ioctl,
1076 #endif
1077 };
1078 EXPORT_SYMBOL(inet_dgram_ops);
1079
1080 /*
1081 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1082 * udp_poll
1083 */
1084 static const struct proto_ops inet_sockraw_ops = {
1085 .family = PF_INET,
1086 .owner = THIS_MODULE,
1087 .release = inet_release,
1088 .bind = inet_bind,
1089 .connect = inet_dgram_connect,
1090 .socketpair = sock_no_socketpair,
1091 .accept = sock_no_accept,
1092 .getname = inet_getname,
1093 .poll = datagram_poll,
1094 .ioctl = inet_ioctl,
1095 .gettstamp = sock_gettstamp,
1096 .listen = sock_no_listen,
1097 .shutdown = inet_shutdown,
1098 .setsockopt = sock_common_setsockopt,
1099 .getsockopt = sock_common_getsockopt,
1100 .sendmsg = inet_sendmsg,
1101 .recvmsg = inet_recvmsg,
1102 .mmap = sock_no_mmap,
1103 .sendpage = inet_sendpage,
1104 #ifdef CONFIG_COMPAT
1105 .compat_ioctl = inet_compat_ioctl,
1106 #endif
1107 };
1108
1109 static const struct net_proto_family inet_family_ops = {
1110 .family = PF_INET,
1111 .create = inet_create,
1112 .owner = THIS_MODULE,
1113 };
1114
1115 /* Upon startup we insert all the elements in inetsw_array[] into
1116 * the linked list inetsw.
1117 */
1118 static struct inet_protosw inetsw_array[] =
1119 {
1120 {
1121 .type = SOCK_STREAM,
1122 .protocol = IPPROTO_TCP,
1123 .prot = &tcp_prot,
1124 .ops = &inet_stream_ops,
1125 .flags = INET_PROTOSW_PERMANENT |
1126 INET_PROTOSW_ICSK,
1127 },
1128
1129 {
1130 .type = SOCK_DGRAM,
1131 .protocol = IPPROTO_UDP,
1132 .prot = &udp_prot,
1133 .ops = &inet_dgram_ops,
1134 .flags = INET_PROTOSW_PERMANENT,
1135 },
1136
1137 {
1138 .type = SOCK_DGRAM,
1139 .protocol = IPPROTO_ICMP,
1140 .prot = &ping_prot,
1141 .ops = &inet_sockraw_ops,
1142 .flags = INET_PROTOSW_REUSE,
1143 },
1144
1145 {
1146 .type = SOCK_RAW,
1147 .protocol = IPPROTO_IP, /* wild card */
1148 .prot = &raw_prot,
1149 .ops = &inet_sockraw_ops,
1150 .flags = INET_PROTOSW_REUSE,
1151 }
1152 };
1153
1154 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1155
inet_register_protosw(struct inet_protosw * p)1156 void inet_register_protosw(struct inet_protosw *p)
1157 {
1158 struct list_head *lh;
1159 struct inet_protosw *answer;
1160 int protocol = p->protocol;
1161 struct list_head *last_perm;
1162
1163 spin_lock_bh(&inetsw_lock);
1164
1165 if (p->type >= SOCK_MAX)
1166 goto out_illegal;
1167
1168 /* If we are trying to override a permanent protocol, bail. */
1169 last_perm = &inetsw[p->type];
1170 list_for_each(lh, &inetsw[p->type]) {
1171 answer = list_entry(lh, struct inet_protosw, list);
1172 /* Check only the non-wild match. */
1173 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1174 break;
1175 if (protocol == answer->protocol)
1176 goto out_permanent;
1177 last_perm = lh;
1178 }
1179
1180 /* Add the new entry after the last permanent entry if any, so that
1181 * the new entry does not override a permanent entry when matched with
1182 * a wild-card protocol. But it is allowed to override any existing
1183 * non-permanent entry. This means that when we remove this entry, the
1184 * system automatically returns to the old behavior.
1185 */
1186 list_add_rcu(&p->list, last_perm);
1187 out:
1188 spin_unlock_bh(&inetsw_lock);
1189
1190 return;
1191
1192 out_permanent:
1193 pr_err("Attempt to override permanent protocol %d\n", protocol);
1194 goto out;
1195
1196 out_illegal:
1197 pr_err("Ignoring attempt to register invalid socket type %d\n",
1198 p->type);
1199 goto out;
1200 }
1201 EXPORT_SYMBOL(inet_register_protosw);
1202
inet_unregister_protosw(struct inet_protosw * p)1203 void inet_unregister_protosw(struct inet_protosw *p)
1204 {
1205 if (INET_PROTOSW_PERMANENT & p->flags) {
1206 pr_err("Attempt to unregister permanent protocol %d\n",
1207 p->protocol);
1208 } else {
1209 spin_lock_bh(&inetsw_lock);
1210 list_del_rcu(&p->list);
1211 spin_unlock_bh(&inetsw_lock);
1212
1213 synchronize_net();
1214 }
1215 }
1216 EXPORT_SYMBOL(inet_unregister_protosw);
1217
inet_sk_reselect_saddr(struct sock * sk)1218 static int inet_sk_reselect_saddr(struct sock *sk)
1219 {
1220 struct inet_sock *inet = inet_sk(sk);
1221 __be32 old_saddr = inet->inet_saddr;
1222 __be32 daddr = inet->inet_daddr;
1223 struct flowi4 *fl4;
1224 struct rtable *rt;
1225 __be32 new_saddr;
1226 struct ip_options_rcu *inet_opt;
1227
1228 inet_opt = rcu_dereference_protected(inet->inet_opt,
1229 lockdep_sock_is_held(sk));
1230 if (inet_opt && inet_opt->opt.srr)
1231 daddr = inet_opt->opt.faddr;
1232
1233 /* Query new route. */
1234 fl4 = &inet->cork.fl.u.ip4;
1235 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1236 sk->sk_bound_dev_if, sk->sk_protocol,
1237 inet->inet_sport, inet->inet_dport, sk);
1238 if (IS_ERR(rt))
1239 return PTR_ERR(rt);
1240
1241 sk_setup_caps(sk, &rt->dst);
1242
1243 new_saddr = fl4->saddr;
1244
1245 if (new_saddr == old_saddr)
1246 return 0;
1247
1248 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1249 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1250 __func__, &old_saddr, &new_saddr);
1251 }
1252
1253 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1254
1255 /*
1256 * XXX The only one ugly spot where we need to
1257 * XXX really change the sockets identity after
1258 * XXX it has entered the hashes. -DaveM
1259 *
1260 * Besides that, it does not check for connection
1261 * uniqueness. Wait for troubles.
1262 */
1263 return __sk_prot_rehash(sk);
1264 }
1265
inet_sk_rebuild_header(struct sock * sk)1266 int inet_sk_rebuild_header(struct sock *sk)
1267 {
1268 struct inet_sock *inet = inet_sk(sk);
1269 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1270 __be32 daddr;
1271 struct ip_options_rcu *inet_opt;
1272 struct flowi4 *fl4;
1273 int err;
1274
1275 /* Route is OK, nothing to do. */
1276 if (rt)
1277 return 0;
1278
1279 /* Reroute. */
1280 rcu_read_lock();
1281 inet_opt = rcu_dereference(inet->inet_opt);
1282 daddr = inet->inet_daddr;
1283 if (inet_opt && inet_opt->opt.srr)
1284 daddr = inet_opt->opt.faddr;
1285 rcu_read_unlock();
1286 fl4 = &inet->cork.fl.u.ip4;
1287 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1288 inet->inet_dport, inet->inet_sport,
1289 sk->sk_protocol, RT_CONN_FLAGS(sk),
1290 sk->sk_bound_dev_if);
1291 if (!IS_ERR(rt)) {
1292 err = 0;
1293 sk_setup_caps(sk, &rt->dst);
1294 } else {
1295 err = PTR_ERR(rt);
1296
1297 /* Routing failed... */
1298 sk->sk_route_caps = 0;
1299 /*
1300 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1301 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1302 */
1303 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1304 sk->sk_state != TCP_SYN_SENT ||
1305 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1306 (err = inet_sk_reselect_saddr(sk)) != 0)
1307 sk->sk_err_soft = -err;
1308 }
1309
1310 return err;
1311 }
1312 EXPORT_SYMBOL(inet_sk_rebuild_header);
1313
inet_sk_set_state(struct sock * sk,int state)1314 void inet_sk_set_state(struct sock *sk, int state)
1315 {
1316 trace_inet_sock_set_state(sk, sk->sk_state, state);
1317 sk->sk_state = state;
1318 }
1319 EXPORT_SYMBOL(inet_sk_set_state);
1320
inet_sk_state_store(struct sock * sk,int newstate)1321 void inet_sk_state_store(struct sock *sk, int newstate)
1322 {
1323 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1324 smp_store_release(&sk->sk_state, newstate);
1325 }
1326
inet_gso_segment(struct sk_buff * skb,netdev_features_t features)1327 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1328 netdev_features_t features)
1329 {
1330 bool udpfrag = false, fixedid = false, gso_partial, encap;
1331 struct sk_buff *segs = ERR_PTR(-EINVAL);
1332 const struct net_offload *ops;
1333 unsigned int offset = 0;
1334 struct iphdr *iph;
1335 int proto, tot_len;
1336 int nhoff;
1337 int ihl;
1338 int id;
1339
1340 skb_reset_network_header(skb);
1341 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1342 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1343 goto out;
1344
1345 iph = ip_hdr(skb);
1346 ihl = iph->ihl * 4;
1347 if (ihl < sizeof(*iph))
1348 goto out;
1349
1350 id = ntohs(iph->id);
1351 proto = iph->protocol;
1352
1353 /* Warning: after this point, iph might be no longer valid */
1354 if (unlikely(!pskb_may_pull(skb, ihl)))
1355 goto out;
1356 __skb_pull(skb, ihl);
1357
1358 encap = SKB_GSO_CB(skb)->encap_level > 0;
1359 if (encap)
1360 features &= skb->dev->hw_enc_features;
1361 SKB_GSO_CB(skb)->encap_level += ihl;
1362
1363 skb_reset_transport_header(skb);
1364
1365 segs = ERR_PTR(-EPROTONOSUPPORT);
1366
1367 if (!skb->encapsulation || encap) {
1368 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1369 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1370
1371 /* fixed ID is invalid if DF bit is not set */
1372 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1373 goto out;
1374 }
1375
1376 ops = rcu_dereference(inet_offloads[proto]);
1377 if (likely(ops && ops->callbacks.gso_segment))
1378 segs = ops->callbacks.gso_segment(skb, features);
1379
1380 if (IS_ERR_OR_NULL(segs))
1381 goto out;
1382
1383 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1384
1385 skb = segs;
1386 do {
1387 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1388 if (udpfrag) {
1389 iph->frag_off = htons(offset >> 3);
1390 if (skb->next)
1391 iph->frag_off |= htons(IP_MF);
1392 offset += skb->len - nhoff - ihl;
1393 tot_len = skb->len - nhoff;
1394 } else if (skb_is_gso(skb)) {
1395 if (!fixedid) {
1396 iph->id = htons(id);
1397 id += skb_shinfo(skb)->gso_segs;
1398 }
1399
1400 if (gso_partial)
1401 tot_len = skb_shinfo(skb)->gso_size +
1402 SKB_GSO_CB(skb)->data_offset +
1403 skb->head - (unsigned char *)iph;
1404 else
1405 tot_len = skb->len - nhoff;
1406 } else {
1407 if (!fixedid)
1408 iph->id = htons(id++);
1409 tot_len = skb->len - nhoff;
1410 }
1411 iph->tot_len = htons(tot_len);
1412 ip_send_check(iph);
1413 if (encap)
1414 skb_reset_inner_headers(skb);
1415 skb->network_header = (u8 *)iph - skb->head;
1416 skb_reset_mac_len(skb);
1417 } while ((skb = skb->next));
1418
1419 out:
1420 return segs;
1421 }
1422 EXPORT_SYMBOL(inet_gso_segment);
1423
ipip_gso_segment(struct sk_buff * skb,netdev_features_t features)1424 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1425 netdev_features_t features)
1426 {
1427 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1428 return ERR_PTR(-EINVAL);
1429
1430 return inet_gso_segment(skb, features);
1431 }
1432
inet_gro_receive(struct list_head * head,struct sk_buff * skb)1433 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1434 {
1435 const struct net_offload *ops;
1436 struct sk_buff *pp = NULL;
1437 const struct iphdr *iph;
1438 struct sk_buff *p;
1439 unsigned int hlen;
1440 unsigned int off;
1441 unsigned int id;
1442 int flush = 1;
1443 int proto;
1444
1445 off = skb_gro_offset(skb);
1446 hlen = off + sizeof(*iph);
1447 iph = skb_gro_header_fast(skb, off);
1448 if (skb_gro_header_hard(skb, hlen)) {
1449 iph = skb_gro_header_slow(skb, hlen, off);
1450 if (unlikely(!iph))
1451 goto out;
1452 }
1453
1454 proto = iph->protocol;
1455
1456 rcu_read_lock();
1457 ops = rcu_dereference(inet_offloads[proto]);
1458 if (!ops || !ops->callbacks.gro_receive)
1459 goto out_unlock;
1460
1461 if (*(u8 *)iph != 0x45)
1462 goto out_unlock;
1463
1464 if (ip_is_fragment(iph))
1465 goto out_unlock;
1466
1467 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1468 goto out_unlock;
1469
1470 id = ntohl(*(__be32 *)&iph->id);
1471 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1472 id >>= 16;
1473
1474 list_for_each_entry(p, head, list) {
1475 struct iphdr *iph2;
1476 u16 flush_id;
1477
1478 if (!NAPI_GRO_CB(p)->same_flow)
1479 continue;
1480
1481 iph2 = (struct iphdr *)(p->data + off);
1482 /* The above works because, with the exception of the top
1483 * (inner most) layer, we only aggregate pkts with the same
1484 * hdr length so all the hdrs we'll need to verify will start
1485 * at the same offset.
1486 */
1487 if ((iph->protocol ^ iph2->protocol) |
1488 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1489 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1490 NAPI_GRO_CB(p)->same_flow = 0;
1491 continue;
1492 }
1493
1494 /* All fields must match except length and checksum. */
1495 NAPI_GRO_CB(p)->flush |=
1496 (iph->ttl ^ iph2->ttl) |
1497 (iph->tos ^ iph2->tos) |
1498 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1499
1500 NAPI_GRO_CB(p)->flush |= flush;
1501
1502 /* We need to store of the IP ID check to be included later
1503 * when we can verify that this packet does in fact belong
1504 * to a given flow.
1505 */
1506 flush_id = (u16)(id - ntohs(iph2->id));
1507
1508 /* This bit of code makes it much easier for us to identify
1509 * the cases where we are doing atomic vs non-atomic IP ID
1510 * checks. Specifically an atomic check can return IP ID
1511 * values 0 - 0xFFFF, while a non-atomic check can only
1512 * return 0 or 0xFFFF.
1513 */
1514 if (!NAPI_GRO_CB(p)->is_atomic ||
1515 !(iph->frag_off & htons(IP_DF))) {
1516 flush_id ^= NAPI_GRO_CB(p)->count;
1517 flush_id = flush_id ? 0xFFFF : 0;
1518 }
1519
1520 /* If the previous IP ID value was based on an atomic
1521 * datagram we can overwrite the value and ignore it.
1522 */
1523 if (NAPI_GRO_CB(skb)->is_atomic)
1524 NAPI_GRO_CB(p)->flush_id = flush_id;
1525 else
1526 NAPI_GRO_CB(p)->flush_id |= flush_id;
1527 }
1528
1529 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1530 NAPI_GRO_CB(skb)->flush |= flush;
1531 skb_set_network_header(skb, off);
1532 /* The above will be needed by the transport layer if there is one
1533 * immediately following this IP hdr.
1534 */
1535
1536 /* Note : No need to call skb_gro_postpull_rcsum() here,
1537 * as we already checked checksum over ipv4 header was 0
1538 */
1539 skb_gro_pull(skb, sizeof(*iph));
1540 skb_set_transport_header(skb, skb_gro_offset(skb));
1541
1542 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1543 ops->callbacks.gro_receive, head, skb);
1544
1545 out_unlock:
1546 rcu_read_unlock();
1547
1548 out:
1549 skb_gro_flush_final(skb, pp, flush);
1550
1551 return pp;
1552 }
1553 EXPORT_SYMBOL(inet_gro_receive);
1554
ipip_gro_receive(struct list_head * head,struct sk_buff * skb)1555 static struct sk_buff *ipip_gro_receive(struct list_head *head,
1556 struct sk_buff *skb)
1557 {
1558 if (NAPI_GRO_CB(skb)->encap_mark) {
1559 NAPI_GRO_CB(skb)->flush = 1;
1560 return NULL;
1561 }
1562
1563 NAPI_GRO_CB(skb)->encap_mark = 1;
1564
1565 return inet_gro_receive(head, skb);
1566 }
1567
1568 #define SECONDS_PER_DAY 86400
1569
1570 /* inet_current_timestamp - Return IP network timestamp
1571 *
1572 * Return milliseconds since midnight in network byte order.
1573 */
inet_current_timestamp(void)1574 __be32 inet_current_timestamp(void)
1575 {
1576 u32 secs;
1577 u32 msecs;
1578 struct timespec64 ts;
1579
1580 ktime_get_real_ts64(&ts);
1581
1582 /* Get secs since midnight. */
1583 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1584 /* Convert to msecs. */
1585 msecs = secs * MSEC_PER_SEC;
1586 /* Convert nsec to msec. */
1587 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1588
1589 /* Convert to network byte order. */
1590 return htonl(msecs);
1591 }
1592 EXPORT_SYMBOL(inet_current_timestamp);
1593
inet_recv_error(struct sock * sk,struct msghdr * msg,int len,int * addr_len)1594 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1595 {
1596 if (sk->sk_family == AF_INET)
1597 return ip_recv_error(sk, msg, len, addr_len);
1598 #if IS_ENABLED(CONFIG_IPV6)
1599 if (sk->sk_family == AF_INET6)
1600 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1601 #endif
1602 return -EINVAL;
1603 }
1604
inet_gro_complete(struct sk_buff * skb,int nhoff)1605 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1606 {
1607 __be16 newlen = htons(skb->len - nhoff);
1608 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1609 const struct net_offload *ops;
1610 int proto = iph->protocol;
1611 int err = -ENOSYS;
1612
1613 if (skb->encapsulation) {
1614 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1615 skb_set_inner_network_header(skb, nhoff);
1616 }
1617
1618 csum_replace2(&iph->check, iph->tot_len, newlen);
1619 iph->tot_len = newlen;
1620
1621 rcu_read_lock();
1622 ops = rcu_dereference(inet_offloads[proto]);
1623 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1624 goto out_unlock;
1625
1626 /* Only need to add sizeof(*iph) to get to the next hdr below
1627 * because any hdr with option will have been flushed in
1628 * inet_gro_receive().
1629 */
1630 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1631 tcp4_gro_complete, udp4_gro_complete,
1632 skb, nhoff + sizeof(*iph));
1633
1634 out_unlock:
1635 rcu_read_unlock();
1636
1637 return err;
1638 }
1639 EXPORT_SYMBOL(inet_gro_complete);
1640
ipip_gro_complete(struct sk_buff * skb,int nhoff)1641 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1642 {
1643 skb->encapsulation = 1;
1644 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1645 return inet_gro_complete(skb, nhoff);
1646 }
1647
inet_ctl_sock_create(struct sock ** sk,unsigned short family,unsigned short type,unsigned char protocol,struct net * net)1648 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1649 unsigned short type, unsigned char protocol,
1650 struct net *net)
1651 {
1652 struct socket *sock;
1653 int rc = sock_create_kern(net, family, type, protocol, &sock);
1654
1655 if (rc == 0) {
1656 *sk = sock->sk;
1657 (*sk)->sk_allocation = GFP_ATOMIC;
1658 /*
1659 * Unhash it so that IP input processing does not even see it,
1660 * we do not wish this socket to see incoming packets.
1661 */
1662 (*sk)->sk_prot->unhash(*sk);
1663 }
1664 return rc;
1665 }
1666 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1667
snmp_get_cpu_field(void __percpu * mib,int cpu,int offt)1668 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1669 {
1670 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1671 }
1672 EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1673
snmp_fold_field(void __percpu * mib,int offt)1674 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1675 {
1676 unsigned long res = 0;
1677 int i;
1678
1679 for_each_possible_cpu(i)
1680 res += snmp_get_cpu_field(mib, i, offt);
1681 return res;
1682 }
1683 EXPORT_SYMBOL_GPL(snmp_fold_field);
1684
1685 #if BITS_PER_LONG==32
1686
snmp_get_cpu_field64(void __percpu * mib,int cpu,int offt,size_t syncp_offset)1687 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1688 size_t syncp_offset)
1689 {
1690 void *bhptr;
1691 struct u64_stats_sync *syncp;
1692 u64 v;
1693 unsigned int start;
1694
1695 bhptr = per_cpu_ptr(mib, cpu);
1696 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1697 do {
1698 start = u64_stats_fetch_begin_irq(syncp);
1699 v = *(((u64 *)bhptr) + offt);
1700 } while (u64_stats_fetch_retry_irq(syncp, start));
1701
1702 return v;
1703 }
1704 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1705
snmp_fold_field64(void __percpu * mib,int offt,size_t syncp_offset)1706 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1707 {
1708 u64 res = 0;
1709 int cpu;
1710
1711 for_each_possible_cpu(cpu) {
1712 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1713 }
1714 return res;
1715 }
1716 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1717 #endif
1718
1719 #ifdef CONFIG_IP_MULTICAST
1720 static const struct net_protocol igmp_protocol = {
1721 .handler = igmp_rcv,
1722 .netns_ok = 1,
1723 };
1724 #endif
1725
1726 /* thinking of making this const? Don't.
1727 * early_demux can change based on sysctl.
1728 */
1729 static 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 .netns_ok = 1,
1736 .icmp_strict_tag_validation = 1,
1737 };
1738
1739 /* thinking of making this const? Don't.
1740 * early_demux can change based on sysctl.
1741 */
1742 static struct net_protocol udp_protocol = {
1743 .early_demux = udp_v4_early_demux,
1744 .early_demux_handler = udp_v4_early_demux,
1745 .handler = udp_rcv,
1746 .err_handler = udp_err,
1747 .no_policy = 1,
1748 .netns_ok = 1,
1749 };
1750
1751 static const struct net_protocol icmp_protocol = {
1752 .handler = icmp_rcv,
1753 .err_handler = icmp_err,
1754 .no_policy = 1,
1755 .netns_ok = 1,
1756 };
1757
ipv4_mib_init_net(struct net * net)1758 static __net_init int ipv4_mib_init_net(struct net *net)
1759 {
1760 int i;
1761
1762 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1763 if (!net->mib.tcp_statistics)
1764 goto err_tcp_mib;
1765 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1766 if (!net->mib.ip_statistics)
1767 goto err_ip_mib;
1768
1769 for_each_possible_cpu(i) {
1770 struct ipstats_mib *af_inet_stats;
1771 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1772 u64_stats_init(&af_inet_stats->syncp);
1773 }
1774
1775 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1776 if (!net->mib.net_statistics)
1777 goto err_net_mib;
1778 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1779 if (!net->mib.udp_statistics)
1780 goto err_udp_mib;
1781 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1782 if (!net->mib.udplite_statistics)
1783 goto err_udplite_mib;
1784 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1785 if (!net->mib.icmp_statistics)
1786 goto err_icmp_mib;
1787 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1788 GFP_KERNEL);
1789 if (!net->mib.icmpmsg_statistics)
1790 goto err_icmpmsg_mib;
1791
1792 tcp_mib_init(net);
1793 return 0;
1794
1795 err_icmpmsg_mib:
1796 free_percpu(net->mib.icmp_statistics);
1797 err_icmp_mib:
1798 free_percpu(net->mib.udplite_statistics);
1799 err_udplite_mib:
1800 free_percpu(net->mib.udp_statistics);
1801 err_udp_mib:
1802 free_percpu(net->mib.net_statistics);
1803 err_net_mib:
1804 free_percpu(net->mib.ip_statistics);
1805 err_ip_mib:
1806 free_percpu(net->mib.tcp_statistics);
1807 err_tcp_mib:
1808 return -ENOMEM;
1809 }
1810
ipv4_mib_exit_net(struct net * net)1811 static __net_exit void ipv4_mib_exit_net(struct net *net)
1812 {
1813 kfree(net->mib.icmpmsg_statistics);
1814 free_percpu(net->mib.icmp_statistics);
1815 free_percpu(net->mib.udplite_statistics);
1816 free_percpu(net->mib.udp_statistics);
1817 free_percpu(net->mib.net_statistics);
1818 free_percpu(net->mib.ip_statistics);
1819 free_percpu(net->mib.tcp_statistics);
1820 #ifdef CONFIG_MPTCP
1821 /* allocated on demand, see mptcp_init_sock() */
1822 free_percpu(net->mib.mptcp_statistics);
1823 #endif
1824 }
1825
1826 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1827 .init = ipv4_mib_init_net,
1828 .exit = ipv4_mib_exit_net,
1829 };
1830
init_ipv4_mibs(void)1831 static int __init init_ipv4_mibs(void)
1832 {
1833 return register_pernet_subsys(&ipv4_mib_ops);
1834 }
1835
inet_init_net(struct net * net)1836 static __net_init int inet_init_net(struct net *net)
1837 {
1838 /*
1839 * Set defaults for local port range
1840 */
1841 seqlock_init(&net->ipv4.ip_local_ports.lock);
1842 net->ipv4.ip_local_ports.range[0] = 32768;
1843 net->ipv4.ip_local_ports.range[1] = 60999;
1844
1845 seqlock_init(&net->ipv4.ping_group_range.lock);
1846 /*
1847 * Sane defaults - nobody may create ping sockets.
1848 * Boot scripts should set this to distro-specific group.
1849 */
1850 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1851 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1852
1853 /* Default values for sysctl-controlled parameters.
1854 * We set them here, in case sysctl is not compiled.
1855 */
1856 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1857 net->ipv4.sysctl_ip_fwd_update_priority = 1;
1858 net->ipv4.sysctl_ip_dynaddr = 0;
1859 net->ipv4.sysctl_ip_early_demux = 1;
1860 net->ipv4.sysctl_udp_early_demux = 1;
1861 net->ipv4.sysctl_tcp_early_demux = 1;
1862 net->ipv4.sysctl_nexthop_compat_mode = 1;
1863 #ifdef CONFIG_SYSCTL
1864 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1865 #endif
1866
1867 /* Some igmp sysctl, whose values are always used */
1868 net->ipv4.sysctl_igmp_max_memberships = 20;
1869 net->ipv4.sysctl_igmp_max_msf = 10;
1870 /* IGMP reports for link-local multicast groups are enabled by default */
1871 net->ipv4.sysctl_igmp_llm_reports = 1;
1872 net->ipv4.sysctl_igmp_qrv = 2;
1873
1874 return 0;
1875 }
1876
1877 static __net_initdata struct pernet_operations af_inet_ops = {
1878 .init = inet_init_net,
1879 };
1880
init_inet_pernet_ops(void)1881 static int __init init_inet_pernet_ops(void)
1882 {
1883 return register_pernet_subsys(&af_inet_ops);
1884 }
1885
1886 static int ipv4_proc_init(void);
1887
1888 /*
1889 * IP protocol layer initialiser
1890 */
1891
1892 static struct packet_offload ip_packet_offload __read_mostly = {
1893 .type = cpu_to_be16(ETH_P_IP),
1894 .callbacks = {
1895 .gso_segment = inet_gso_segment,
1896 .gro_receive = inet_gro_receive,
1897 .gro_complete = inet_gro_complete,
1898 },
1899 };
1900
1901 static const struct net_offload ipip_offload = {
1902 .callbacks = {
1903 .gso_segment = ipip_gso_segment,
1904 .gro_receive = ipip_gro_receive,
1905 .gro_complete = ipip_gro_complete,
1906 },
1907 };
1908
ipip_offload_init(void)1909 static int __init ipip_offload_init(void)
1910 {
1911 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1912 }
1913
ipv4_offload_init(void)1914 static int __init ipv4_offload_init(void)
1915 {
1916 /*
1917 * Add offloads
1918 */
1919 if (udpv4_offload_init() < 0)
1920 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1921 if (tcpv4_offload_init() < 0)
1922 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1923 if (ipip_offload_init() < 0)
1924 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1925
1926 dev_add_offload(&ip_packet_offload);
1927 return 0;
1928 }
1929
1930 fs_initcall(ipv4_offload_init);
1931
1932 static struct packet_type ip_packet_type __read_mostly = {
1933 .type = cpu_to_be16(ETH_P_IP),
1934 .func = ip_rcv,
1935 .list_func = ip_list_rcv,
1936 };
1937
inet_init(void)1938 static int __init inet_init(void)
1939 {
1940 struct inet_protosw *q;
1941 struct list_head *r;
1942 int rc;
1943
1944 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1945
1946 rc = proto_register(&tcp_prot, 1);
1947 if (rc)
1948 goto out;
1949
1950 rc = proto_register(&udp_prot, 1);
1951 if (rc)
1952 goto out_unregister_tcp_proto;
1953
1954 rc = proto_register(&raw_prot, 1);
1955 if (rc)
1956 goto out_unregister_udp_proto;
1957
1958 rc = proto_register(&ping_prot, 1);
1959 if (rc)
1960 goto out_unregister_raw_proto;
1961
1962 /*
1963 * Tell SOCKET that we are alive...
1964 */
1965
1966 (void)sock_register(&inet_family_ops);
1967
1968 #ifdef CONFIG_SYSCTL
1969 ip_static_sysctl_init();
1970 #endif
1971
1972 /*
1973 * Add all the base protocols.
1974 */
1975
1976 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1977 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1978 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1979 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1980 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1981 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1982 #ifdef CONFIG_IP_MULTICAST
1983 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1984 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1985 #endif
1986
1987 /* Register the socket-side information for inet_create. */
1988 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1989 INIT_LIST_HEAD(r);
1990
1991 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1992 inet_register_protosw(q);
1993
1994 /*
1995 * Set the ARP module up
1996 */
1997
1998 arp_init();
1999
2000 /*
2001 * Set the IP module up
2002 */
2003
2004 ip_init();
2005
2006 /* Setup TCP slab cache for open requests. */
2007 tcp_init();
2008
2009 /* Setup UDP memory threshold */
2010 udp_init();
2011
2012 /* Add UDP-Lite (RFC 3828) */
2013 udplite4_register();
2014
2015 raw_init();
2016
2017 ping_init();
2018
2019 /*
2020 * Set the ICMP layer up
2021 */
2022
2023 if (icmp_init() < 0)
2024 panic("Failed to create the ICMP control socket.\n");
2025
2026 /*
2027 * Initialise the multicast router
2028 */
2029 #if defined(CONFIG_IP_MROUTE)
2030 if (ip_mr_init())
2031 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2032 #endif
2033
2034 if (init_inet_pernet_ops())
2035 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2036 /*
2037 * Initialise per-cpu ipv4 mibs
2038 */
2039
2040 if (init_ipv4_mibs())
2041 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
2042
2043 ipv4_proc_init();
2044
2045 ipfrag_init();
2046
2047 dev_add_pack(&ip_packet_type);
2048
2049 ip_tunnel_core_init();
2050
2051 rc = 0;
2052 out:
2053 return rc;
2054 out_unregister_raw_proto:
2055 proto_unregister(&raw_prot);
2056 out_unregister_udp_proto:
2057 proto_unregister(&udp_prot);
2058 out_unregister_tcp_proto:
2059 proto_unregister(&tcp_prot);
2060 goto out;
2061 }
2062
2063 fs_initcall(inet_init);
2064
2065 /* ------------------------------------------------------------------------ */
2066
2067 #ifdef CONFIG_PROC_FS
ipv4_proc_init(void)2068 static int __init ipv4_proc_init(void)
2069 {
2070 int rc = 0;
2071
2072 if (raw_proc_init())
2073 goto out_raw;
2074 if (tcp4_proc_init())
2075 goto out_tcp;
2076 if (udp4_proc_init())
2077 goto out_udp;
2078 if (ping_proc_init())
2079 goto out_ping;
2080 if (ip_misc_proc_init())
2081 goto out_misc;
2082 out:
2083 return rc;
2084 out_misc:
2085 ping_proc_exit();
2086 out_ping:
2087 udp4_proc_exit();
2088 out_udp:
2089 tcp4_proc_exit();
2090 out_tcp:
2091 raw_proc_exit();
2092 out_raw:
2093 rc = -ENOMEM;
2094 goto out;
2095 }
2096
2097 #else /* CONFIG_PROC_FS */
ipv4_proc_init(void)2098 static int __init ipv4_proc_init(void)
2099 {
2100 return 0;
2101 }
2102 #endif /* CONFIG_PROC_FS */
2103
