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1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * PF_INET protocol family socket handler.
7 *
8 * Authors: Ross Biro
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Florian La Roche, <flla@stud.uni-sb.de>
11 * Alan Cox, <A.Cox@swansea.ac.uk>
12 *
13 * Changes (see also sock.c)
14 *
15 * piggy,
16 * Karl Knutson : Socket protocol table
17 * A.N.Kuznetsov : Socket death error in accept().
18 * John Richardson : Fix non blocking error in connect()
19 * so sockets that fail to connect
20 * don't return -EINPROGRESS.
21 * Alan Cox : Asynchronous I/O support
22 * Alan Cox : Keep correct socket pointer on sock
23 * structures
24 * when accept() ed
25 * Alan Cox : Semantics of SO_LINGER aren't state
26 * moved to close when you look carefully.
27 * With this fixed and the accept bug fixed
28 * some RPC stuff seems happier.
29 * Niibe Yutaka : 4.4BSD style write async I/O
30 * Alan Cox,
31 * Tony Gale : Fixed reuse semantics.
32 * Alan Cox : bind() shouldn't abort existing but dead
33 * sockets. Stops FTP netin:.. I hope.
34 * Alan Cox : bind() works correctly for RAW sockets.
35 * Note that FreeBSD at least was broken
36 * in this respect so be careful with
37 * compatibility tests...
38 * Alan Cox : routing cache support
39 * Alan Cox : memzero the socket structure for
40 * compactness.
41 * Matt Day : nonblock connect error handler
42 * Alan Cox : Allow large numbers of pending sockets
43 * (eg for big web sites), but only if
44 * specifically application requested.
45 * Alan Cox : New buffering throughout IP. Used
46 * dumbly.
47 * Alan Cox : New buffering now used smartly.
48 * Alan Cox : BSD rather than common sense
49 * interpretation of listen.
50 * Germano Caronni : Assorted small races.
51 * Alan Cox : sendmsg/recvmsg basic support.
52 * Alan Cox : Only sendmsg/recvmsg now supported.
53 * Alan Cox : Locked down bind (see security list).
54 * Alan Cox : Loosened bind a little.
55 * Mike McLagan : ADD/DEL DLCI Ioctls
56 * Willy Konynenberg : Transparent proxying support.
57 * David S. Miller : New socket lookup architecture.
58 * Some other random speedups.
59 * Cyrus Durgin : Cleaned up file for kmod hacks.
60 * Andi Kleen : Fix inet_stream_connect TCP race.
61 *
62 * This program is free software; you can redistribute it and/or
63 * modify it under the terms of the GNU General Public License
64 * as published by the Free Software Foundation; either version
65 * 2 of the License, or (at your option) any later version.
66 */
67
68#define pr_fmt(fmt) "IPv4: " fmt
69
70#include <linux/err.h>
71#include <linux/errno.h>
72#include <linux/types.h>
73#include <linux/socket.h>
74#include <linux/in.h>
75#include <linux/kernel.h>
76#include <linux/kmod.h>
77#include <linux/sched.h>
78#include <linux/timer.h>
79#include <linux/string.h>
80#include <linux/sockios.h>
81#include <linux/net.h>
82#include <linux/capability.h>
83#include <linux/fcntl.h>
84#include <linux/mm.h>
85#include <linux/interrupt.h>
86#include <linux/stat.h>
87#include <linux/init.h>
88#include <linux/poll.h>
89#include <linux/netfilter_ipv4.h>
90#include <linux/random.h>
91#include <linux/slab.h>
92
93#include <linux/uaccess.h>
94
95#include <linux/inet.h>
96#include <linux/igmp.h>
97#include <linux/inetdevice.h>
98#include <linux/netdevice.h>
99#include <net/checksum.h>
100#include <net/ip.h>
101#include <net/protocol.h>
102#include <net/arp.h>
103#include <net/route.h>
104#include <net/ip_fib.h>
105#include <net/inet_connection_sock.h>
106#include <net/tcp.h>
107#include <net/udp.h>
108#include <net/udplite.h>
109#include <net/ping.h>
110#include <linux/skbuff.h>
111#include <net/sock.h>
112#include <net/raw.h>
113#include <net/icmp.h>
114#include <net/inet_common.h>
115#include <net/ip_tunnels.h>
116#include <net/xfrm.h>
117#include <net/net_namespace.h>
118#include <net/secure_seq.h>
119#ifdef CONFIG_IP_MROUTE
120#include <linux/mroute.h>
121#endif
122#include <net/l3mdev.h>
123
124#include <trace/events/sock.h>
125
126/* The inetsw table contains everything that inet_create needs to
127 * build a new socket.
128 */
129static struct list_head inetsw[SOCK_MAX];
130static DEFINE_SPINLOCK(inetsw_lock);
131
132/* New destruction routine */
133
134void inet_sock_destruct(struct sock *sk)
135{
136 struct inet_sock *inet = inet_sk(sk);
137
138 __skb_queue_purge(&sk->sk_receive_queue);
139 __skb_queue_purge(&sk->sk_error_queue);
140
141 sk_mem_reclaim(sk);
142
143 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
144 pr_err("Attempt to release TCP socket in state %d %p\n",
145 sk->sk_state, sk);
146 return;
147 }
148 if (!sock_flag(sk, SOCK_DEAD)) {
149 pr_err("Attempt to release alive inet socket %p\n", sk);
150 return;
151 }
152
153 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
154 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
155 WARN_ON(sk->sk_wmem_queued);
156 WARN_ON(sk->sk_forward_alloc);
157
158 kfree(rcu_dereference_protected(inet->inet_opt, 1));
159 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
160 dst_release(sk->sk_rx_dst);
161 sk_refcnt_debug_dec(sk);
162}
163EXPORT_SYMBOL(inet_sock_destruct);
164
165/*
166 * The routines beyond this point handle the behaviour of an AF_INET
167 * socket object. Mostly it punts to the subprotocols of IP to do
168 * the work.
169 */
170
171/*
172 * Automatically bind an unbound socket.
173 */
174
175static int inet_autobind(struct sock *sk)
176{
177 struct inet_sock *inet;
178 /* We may need to bind the socket. */
179 lock_sock(sk);
180 inet = inet_sk(sk);
181 if (!inet->inet_num) {
182 if (sk->sk_prot->get_port(sk, 0)) {
183 release_sock(sk);
184 return -EAGAIN;
185 }
186 inet->inet_sport = htons(inet->inet_num);
187 }
188 release_sock(sk);
189 return 0;
190}
191
192/*
193 * Move a socket into listening state.
194 */
195int inet_listen(struct socket *sock, int backlog)
196{
197 struct sock *sk = sock->sk;
198 unsigned char old_state;
199 int err, tcp_fastopen;
200
201 lock_sock(sk);
202
203 err = -EINVAL;
204 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
205 goto out;
206
207 old_state = sk->sk_state;
208 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
209 goto out;
210
211 /* Really, if the socket is already in listen state
212 * we can only allow the backlog to be adjusted.
213 */
214 if (old_state != TCP_LISTEN) {
215 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
216 * Note that only TCP sockets (SOCK_STREAM) will reach here.
217 * Also fastopen backlog may already been set via the option
218 * because the socket was in TCP_LISTEN state previously but
219 * was shutdown() rather than close().
220 */
221 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen;
222 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
223 (tcp_fastopen & TFO_SERVER_ENABLE) &&
224 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
225 fastopen_queue_tune(sk, backlog);
226 tcp_fastopen_init_key_once(sock_net(sk));
227 }
228
229 err = inet_csk_listen_start(sk, backlog);
230 if (err)
231 goto out;
232 }
233 sk->sk_max_ack_backlog = backlog;
234 err = 0;
235
236out:
237 release_sock(sk);
238 return err;
239}
240EXPORT_SYMBOL(inet_listen);
241
242/*
243 * Create an inet socket.
244 */
245
246static int inet_create(struct net *net, struct socket *sock, int protocol,
247 int kern)
248{
249 struct sock *sk;
250 struct inet_protosw *answer;
251 struct inet_sock *inet;
252 struct proto *answer_prot;
253 unsigned char answer_flags;
254 int try_loading_module = 0;
255 int err;
256
257 if (protocol < 0 || protocol >= IPPROTO_MAX)
258 return -EINVAL;
259
260 sock->state = SS_UNCONNECTED;
261
262 /* Look for the requested type/protocol pair. */
263lookup_protocol:
264 err = -ESOCKTNOSUPPORT;
265 rcu_read_lock();
266 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
267
268 err = 0;
269 /* Check the non-wild match. */
270 if (protocol == answer->protocol) {
271 if (protocol != IPPROTO_IP)
272 break;
273 } else {
274 /* Check for the two wild cases. */
275 if (IPPROTO_IP == protocol) {
276 protocol = answer->protocol;
277 break;
278 }
279 if (IPPROTO_IP == answer->protocol)
280 break;
281 }
282 err = -EPROTONOSUPPORT;
283 }
284
285 if (unlikely(err)) {
286 if (try_loading_module < 2) {
287 rcu_read_unlock();
288 /*
289 * Be more specific, e.g. net-pf-2-proto-132-type-1
290 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
291 */
292 if (++try_loading_module == 1)
293 request_module("net-pf-%d-proto-%d-type-%d",
294 PF_INET, protocol, sock->type);
295 /*
296 * Fall back to generic, e.g. net-pf-2-proto-132
297 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
298 */
299 else
300 request_module("net-pf-%d-proto-%d",
301 PF_INET, protocol);
302 goto lookup_protocol;
303 } else
304 goto out_rcu_unlock;
305 }
306
307 err = -EPERM;
308 if (sock->type == SOCK_RAW && !kern &&
309 !ns_capable(net->user_ns, CAP_NET_RAW))
310 goto out_rcu_unlock;
311
312 sock->ops = answer->ops;
313 answer_prot = answer->prot;
314 answer_flags = answer->flags;
315 rcu_read_unlock();
316
317 WARN_ON(!answer_prot->slab);
318
319 err = -ENOBUFS;
320 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
321 if (!sk)
322 goto out;
323
324 err = 0;
325 if (INET_PROTOSW_REUSE & answer_flags)
326 sk->sk_reuse = SK_CAN_REUSE;
327
328 inet = inet_sk(sk);
329 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
330
331 inet->nodefrag = 0;
332
333 if (SOCK_RAW == sock->type) {
334 inet->inet_num = protocol;
335 if (IPPROTO_RAW == protocol)
336 inet->hdrincl = 1;
337 }
338
339 if (net->ipv4.sysctl_ip_no_pmtu_disc)
340 inet->pmtudisc = IP_PMTUDISC_DONT;
341 else
342 inet->pmtudisc = IP_PMTUDISC_WANT;
343
344 inet->inet_id = 0;
345
346 sock_init_data(sock, sk);
347
348 sk->sk_destruct = inet_sock_destruct;
349 sk->sk_protocol = protocol;
350 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
351
352 inet->uc_ttl = -1;
353 inet->mc_loop = 1;
354 inet->mc_ttl = 1;
355 inet->mc_all = 1;
356 inet->mc_index = 0;
357 inet->mc_list = NULL;
358 inet->rcv_tos = 0;
359
360 sk_refcnt_debug_inc(sk);
361
362 if (inet->inet_num) {
363 /* It assumes that any protocol which allows
364 * the user to assign a number at socket
365 * creation time automatically
366 * shares.
367 */
368 inet->inet_sport = htons(inet->inet_num);
369 /* Add to protocol hash chains. */
370 err = sk->sk_prot->hash(sk);
371 if (err) {
372 sk_common_release(sk);
373 goto out;
374 }
375 }
376
377 if (sk->sk_prot->init) {
378 err = sk->sk_prot->init(sk);
379 if (err) {
380 sk_common_release(sk);
381 goto out;
382 }
383 }
384
385 if (!kern) {
386 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
387 if (err) {
388 sk_common_release(sk);
389 goto out;
390 }
391 }
392out:
393 return err;
394out_rcu_unlock:
395 rcu_read_unlock();
396 goto out;
397}
398
399
400/*
401 * The peer socket should always be NULL (or else). When we call this
402 * function we are destroying the object and from then on nobody
403 * should refer to it.
404 */
405int inet_release(struct socket *sock)
406{
407 struct sock *sk = sock->sk;
408
409 if (sk) {
410 long timeout;
411
412 /* Applications forget to leave groups before exiting */
413 ip_mc_drop_socket(sk);
414
415 /* If linger is set, we don't return until the close
416 * is complete. Otherwise we return immediately. The
417 * actually closing is done the same either way.
418 *
419 * If the close is due to the process exiting, we never
420 * linger..
421 */
422 timeout = 0;
423 if (sock_flag(sk, SOCK_LINGER) &&
424 !(current->flags & PF_EXITING))
425 timeout = sk->sk_lingertime;
426 sock->sk = NULL;
427 sk->sk_prot->close(sk, timeout);
428 }
429 return 0;
430}
431EXPORT_SYMBOL(inet_release);
432
433int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
434{
435 struct sock *sk = sock->sk;
436 int err;
437
438 /* If the socket has its own bind function then use it. (RAW) */
439 if (sk->sk_prot->bind) {
440 return sk->sk_prot->bind(sk, uaddr, addr_len);
441 }
442 if (addr_len < sizeof(struct sockaddr_in))
443 return -EINVAL;
444
445 /* BPF prog is run before any checks are done so that if the prog
446 * changes context in a wrong way it will be caught.
447 */
448 err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr);
449 if (err)
450 return err;
451
452 return __inet_bind(sk, uaddr, addr_len, false, true);
453}
454EXPORT_SYMBOL(inet_bind);
455
456int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
457 bool force_bind_address_no_port, bool with_lock)
458{
459 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
460 struct inet_sock *inet = inet_sk(sk);
461 struct net *net = sock_net(sk);
462 unsigned short snum;
463 int chk_addr_ret;
464 u32 tb_id = RT_TABLE_LOCAL;
465 int err;
466
467 if (addr->sin_family != AF_INET) {
468 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
469 * only if s_addr is INADDR_ANY.
470 */
471 err = -EAFNOSUPPORT;
472 if (addr->sin_family != AF_UNSPEC ||
473 addr->sin_addr.s_addr != htonl(INADDR_ANY))
474 goto out;
475 }
476
477 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
478 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
479
480 /* Not specified by any standard per-se, however it breaks too
481 * many applications when removed. It is unfortunate since
482 * allowing applications to make a non-local bind solves
483 * several problems with systems using dynamic addressing.
484 * (ie. your servers still start up even if your ISDN link
485 * is temporarily down)
486 */
487 err = -EADDRNOTAVAIL;
488 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
489 !(inet->freebind || inet->transparent) &&
490 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
491 chk_addr_ret != RTN_LOCAL &&
492 chk_addr_ret != RTN_MULTICAST &&
493 chk_addr_ret != RTN_BROADCAST)
494 goto out;
495
496 snum = ntohs(addr->sin_port);
497 err = -EACCES;
498 if (snum && snum < inet_prot_sock(net) &&
499 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
500 goto out;
501
502 /* We keep a pair of addresses. rcv_saddr is the one
503 * used by hash lookups, and saddr is used for transmit.
504 *
505 * In the BSD API these are the same except where it
506 * would be illegal to use them (multicast/broadcast) in
507 * which case the sending device address is used.
508 */
509 if (with_lock)
510 lock_sock(sk);
511
512 /* Check these errors (active socket, double bind). */
513 err = -EINVAL;
514 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
515 goto out_release_sock;
516
517 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
518 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
519 inet->inet_saddr = 0; /* Use device */
520
521 /* Make sure we are allowed to bind here. */
522 if (snum || !(inet->bind_address_no_port ||
523 force_bind_address_no_port)) {
524 if (sk->sk_prot->get_port(sk, snum)) {
525 inet->inet_saddr = inet->inet_rcv_saddr = 0;
526 err = -EADDRINUSE;
527 goto out_release_sock;
528 }
529 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
530 if (err) {
531 inet->inet_saddr = inet->inet_rcv_saddr = 0;
532 goto out_release_sock;
533 }
534 }
535
536 if (inet->inet_rcv_saddr)
537 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
538 if (snum)
539 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
540 inet->inet_sport = htons(inet->inet_num);
541 inet->inet_daddr = 0;
542 inet->inet_dport = 0;
543 sk_dst_reset(sk);
544 err = 0;
545out_release_sock:
546 if (with_lock)
547 release_sock(sk);
548out:
549 return err;
550}
551
552int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
553 int addr_len, int flags)
554{
555 struct sock *sk = sock->sk;
556 int err;
557
558 if (addr_len < sizeof(uaddr->sa_family))
559 return -EINVAL;
560 if (uaddr->sa_family == AF_UNSPEC)
561 return sk->sk_prot->disconnect(sk, flags);
562
563 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
564 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
565 if (err)
566 return err;
567 }
568
569 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
570 return -EAGAIN;
571 return sk->sk_prot->connect(sk, uaddr, addr_len);
572}
573EXPORT_SYMBOL(inet_dgram_connect);
574
575static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
576{
577 DEFINE_WAIT_FUNC(wait, woken_wake_function);
578
579 add_wait_queue(sk_sleep(sk), &wait);
580 sk->sk_write_pending += writebias;
581
582 /* Basic assumption: if someone sets sk->sk_err, he _must_
583 * change state of the socket from TCP_SYN_*.
584 * Connect() does not allow to get error notifications
585 * without closing the socket.
586 */
587 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
588 release_sock(sk);
589 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
590 lock_sock(sk);
591 if (signal_pending(current) || !timeo)
592 break;
593 }
594 remove_wait_queue(sk_sleep(sk), &wait);
595 sk->sk_write_pending -= writebias;
596 return timeo;
597}
598
599/*
600 * Connect to a remote host. There is regrettably still a little
601 * TCP 'magic' in here.
602 */
603int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
604 int addr_len, int flags, int is_sendmsg)
605{
606 struct sock *sk = sock->sk;
607 int err;
608 long timeo;
609
610 /*
611 * uaddr can be NULL and addr_len can be 0 if:
612 * sk is a TCP fastopen active socket and
613 * TCP_FASTOPEN_CONNECT sockopt is set and
614 * we already have a valid cookie for this socket.
615 * In this case, user can call write() after connect().
616 * write() will invoke tcp_sendmsg_fastopen() which calls
617 * __inet_stream_connect().
618 */
619 if (uaddr) {
620 if (addr_len < sizeof(uaddr->sa_family))
621 return -EINVAL;
622
623 if (uaddr->sa_family == AF_UNSPEC) {
624 err = sk->sk_prot->disconnect(sk, flags);
625 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
626 goto out;
627 }
628 }
629
630 switch (sock->state) {
631 default:
632 err = -EINVAL;
633 goto out;
634 case SS_CONNECTED:
635 err = -EISCONN;
636 goto out;
637 case SS_CONNECTING:
638 if (inet_sk(sk)->defer_connect)
639 err = is_sendmsg ? -EINPROGRESS : -EISCONN;
640 else
641 err = -EALREADY;
642 /* Fall out of switch with err, set for this state */
643 break;
644 case SS_UNCONNECTED:
645 err = -EISCONN;
646 if (sk->sk_state != TCP_CLOSE)
647 goto out;
648
649 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
650 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
651 if (err)
652 goto out;
653 }
654
655 err = sk->sk_prot->connect(sk, uaddr, addr_len);
656 if (err < 0)
657 goto out;
658
659 sock->state = SS_CONNECTING;
660
661 if (!err && inet_sk(sk)->defer_connect)
662 goto out;
663
664 /* Just entered SS_CONNECTING state; the only
665 * difference is that return value in non-blocking
666 * case is EINPROGRESS, rather than EALREADY.
667 */
668 err = -EINPROGRESS;
669 break;
670 }
671
672 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
673
674 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
675 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
676 tcp_sk(sk)->fastopen_req &&
677 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
678
679 /* Error code is set above */
680 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
681 goto out;
682
683 err = sock_intr_errno(timeo);
684 if (signal_pending(current))
685 goto out;
686 }
687
688 /* Connection was closed by RST, timeout, ICMP error
689 * or another process disconnected us.
690 */
691 if (sk->sk_state == TCP_CLOSE)
692 goto sock_error;
693
694 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
695 * and error was received after socket entered established state.
696 * Hence, it is handled normally after connect() return successfully.
697 */
698
699 sock->state = SS_CONNECTED;
700 err = 0;
701out:
702 return err;
703
704sock_error:
705 err = sock_error(sk) ? : -ECONNABORTED;
706 sock->state = SS_UNCONNECTED;
707 if (sk->sk_prot->disconnect(sk, flags))
708 sock->state = SS_DISCONNECTING;
709 goto out;
710}
711EXPORT_SYMBOL(__inet_stream_connect);
712
713int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
714 int addr_len, int flags)
715{
716 int err;
717
718 lock_sock(sock->sk);
719 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
720 release_sock(sock->sk);
721 return err;
722}
723EXPORT_SYMBOL(inet_stream_connect);
724
725/*
726 * Accept a pending connection. The TCP layer now gives BSD semantics.
727 */
728
729int inet_accept(struct socket *sock, struct socket *newsock, int flags,
730 bool kern)
731{
732 struct sock *sk1 = sock->sk;
733 int err = -EINVAL;
734 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
735
736 if (!sk2)
737 goto do_err;
738
739 lock_sock(sk2);
740
741 sock_rps_record_flow(sk2);
742 WARN_ON(!((1 << sk2->sk_state) &
743 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
744 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
745
746 sock_graft(sk2, newsock);
747
748 newsock->state = SS_CONNECTED;
749 err = 0;
750 release_sock(sk2);
751do_err:
752 return err;
753}
754EXPORT_SYMBOL(inet_accept);
755
756
757/*
758 * This does both peername and sockname.
759 */
760int inet_getname(struct socket *sock, struct sockaddr *uaddr,
761 int peer)
762{
763 struct sock *sk = sock->sk;
764 struct inet_sock *inet = inet_sk(sk);
765 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
766
767 sin->sin_family = AF_INET;
768 if (peer) {
769 if (!inet->inet_dport ||
770 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
771 peer == 1))
772 return -ENOTCONN;
773 sin->sin_port = inet->inet_dport;
774 sin->sin_addr.s_addr = inet->inet_daddr;
775 } else {
776 __be32 addr = inet->inet_rcv_saddr;
777 if (!addr)
778 addr = inet->inet_saddr;
779 sin->sin_port = inet->inet_sport;
780 sin->sin_addr.s_addr = addr;
781 }
782 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
783 return sizeof(*sin);
784}
785EXPORT_SYMBOL(inet_getname);
786
787int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
788{
789 struct sock *sk = sock->sk;
790
791 sock_rps_record_flow(sk);
792
793 /* We may need to bind the socket. */
794 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
795 inet_autobind(sk))
796 return -EAGAIN;
797
798 return sk->sk_prot->sendmsg(sk, msg, size);
799}
800EXPORT_SYMBOL(inet_sendmsg);
801
802ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
803 size_t size, int flags)
804{
805 struct sock *sk = sock->sk;
806
807 sock_rps_record_flow(sk);
808
809 /* We may need to bind the socket. */
810 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
811 inet_autobind(sk))
812 return -EAGAIN;
813
814 if (sk->sk_prot->sendpage)
815 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
816 return sock_no_sendpage(sock, page, offset, size, flags);
817}
818EXPORT_SYMBOL(inet_sendpage);
819
820int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
821 int flags)
822{
823 struct sock *sk = sock->sk;
824 int addr_len = 0;
825 int err;
826
827 if (likely(!(flags & MSG_ERRQUEUE)))
828 sock_rps_record_flow(sk);
829
830 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
831 flags & ~MSG_DONTWAIT, &addr_len);
832 if (err >= 0)
833 msg->msg_namelen = addr_len;
834 return err;
835}
836EXPORT_SYMBOL(inet_recvmsg);
837
838int inet_shutdown(struct socket *sock, int how)
839{
840 struct sock *sk = sock->sk;
841 int err = 0;
842
843 /* This should really check to make sure
844 * the socket is a TCP socket. (WHY AC...)
845 */
846 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
847 1->2 bit 2 snds.
848 2->3 */
849 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
850 return -EINVAL;
851
852 lock_sock(sk);
853 if (sock->state == SS_CONNECTING) {
854 if ((1 << sk->sk_state) &
855 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
856 sock->state = SS_DISCONNECTING;
857 else
858 sock->state = SS_CONNECTED;
859 }
860
861 switch (sk->sk_state) {
862 case TCP_CLOSE:
863 err = -ENOTCONN;
864 /* Hack to wake up other listeners, who can poll for
865 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
866 /* fall through */
867 default:
868 sk->sk_shutdown |= how;
869 if (sk->sk_prot->shutdown)
870 sk->sk_prot->shutdown(sk, how);
871 break;
872
873 /* Remaining two branches are temporary solution for missing
874 * close() in multithreaded environment. It is _not_ a good idea,
875 * but we have no choice until close() is repaired at VFS level.
876 */
877 case TCP_LISTEN:
878 if (!(how & RCV_SHUTDOWN))
879 break;
880 /* fall through */
881 case TCP_SYN_SENT:
882 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
883 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
884 break;
885 }
886
887 /* Wake up anyone sleeping in poll. */
888 sk->sk_state_change(sk);
889 release_sock(sk);
890 return err;
891}
892EXPORT_SYMBOL(inet_shutdown);
893
894/*
895 * ioctl() calls you can issue on an INET socket. Most of these are
896 * device configuration and stuff and very rarely used. Some ioctls
897 * pass on to the socket itself.
898 *
899 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
900 * loads the devconfigure module does its configuring and unloads it.
901 * There's a good 20K of config code hanging around the kernel.
902 */
903
904int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
905{
906 struct sock *sk = sock->sk;
907 int err = 0;
908 struct net *net = sock_net(sk);
909 void __user *p = (void __user *)arg;
910 struct ifreq ifr;
911 struct rtentry rt;
912
913 switch (cmd) {
914 case SIOCGSTAMP:
915 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
916 break;
917 case SIOCGSTAMPNS:
918 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
919 break;
920 case SIOCADDRT:
921 case SIOCDELRT:
922 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
923 return -EFAULT;
924 err = ip_rt_ioctl(net, cmd, &rt);
925 break;
926 case SIOCRTMSG:
927 err = -EINVAL;
928 break;
929 case SIOCDARP:
930 case SIOCGARP:
931 case SIOCSARP:
932 err = arp_ioctl(net, cmd, (void __user *)arg);
933 break;
934 case SIOCGIFADDR:
935 case SIOCGIFBRDADDR:
936 case SIOCGIFNETMASK:
937 case SIOCGIFDSTADDR:
938 case SIOCGIFPFLAGS:
939 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
940 return -EFAULT;
941 err = devinet_ioctl(net, cmd, &ifr);
942 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
943 err = -EFAULT;
944 break;
945
946 case SIOCSIFADDR:
947 case SIOCSIFBRDADDR:
948 case SIOCSIFNETMASK:
949 case SIOCSIFDSTADDR:
950 case SIOCSIFPFLAGS:
951 case SIOCSIFFLAGS:
952 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
953 return -EFAULT;
954 err = devinet_ioctl(net, cmd, &ifr);
955 break;
956 default:
957 if (sk->sk_prot->ioctl)
958 err = sk->sk_prot->ioctl(sk, cmd, arg);
959 else
960 err = -ENOIOCTLCMD;
961 break;
962 }
963 return err;
964}
965EXPORT_SYMBOL(inet_ioctl);
966
967#ifdef CONFIG_COMPAT
968static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
969{
970 struct sock *sk = sock->sk;
971 int err = -ENOIOCTLCMD;
972
973 if (sk->sk_prot->compat_ioctl)
974 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
975
976 return err;
977}
978#endif
979
980const struct proto_ops inet_stream_ops = {
981 .family = PF_INET,
982 .owner = THIS_MODULE,
983 .release = inet_release,
984 .bind = inet_bind,
985 .connect = inet_stream_connect,
986 .socketpair = sock_no_socketpair,
987 .accept = inet_accept,
988 .getname = inet_getname,
989 .poll = tcp_poll,
990 .ioctl = inet_ioctl,
991 .listen = inet_listen,
992 .shutdown = inet_shutdown,
993 .setsockopt = sock_common_setsockopt,
994 .getsockopt = sock_common_getsockopt,
995 .sendmsg = inet_sendmsg,
996 .recvmsg = inet_recvmsg,
997 .mmap = sock_no_mmap,
998 .sendpage = inet_sendpage,
999 .splice_read = tcp_splice_read,
1000 .read_sock = tcp_read_sock,
1001 .sendmsg_locked = tcp_sendmsg_locked,
1002 .sendpage_locked = tcp_sendpage_locked,
1003 .peek_len = tcp_peek_len,
1004#ifdef CONFIG_COMPAT
1005 .compat_setsockopt = compat_sock_common_setsockopt,
1006 .compat_getsockopt = compat_sock_common_getsockopt,
1007 .compat_ioctl = inet_compat_ioctl,
1008#endif
1009};
1010EXPORT_SYMBOL(inet_stream_ops);
1011
1012const struct proto_ops inet_dgram_ops = {
1013 .family = PF_INET,
1014 .owner = THIS_MODULE,
1015 .release = inet_release,
1016 .bind = inet_bind,
1017 .connect = inet_dgram_connect,
1018 .socketpair = sock_no_socketpair,
1019 .accept = sock_no_accept,
1020 .getname = inet_getname,
1021 .poll = udp_poll,
1022 .ioctl = inet_ioctl,
1023 .listen = sock_no_listen,
1024 .shutdown = inet_shutdown,
1025 .setsockopt = sock_common_setsockopt,
1026 .getsockopt = sock_common_getsockopt,
1027 .sendmsg = inet_sendmsg,
1028 .recvmsg = inet_recvmsg,
1029 .mmap = sock_no_mmap,
1030 .sendpage = inet_sendpage,
1031 .set_peek_off = sk_set_peek_off,
1032#ifdef CONFIG_COMPAT
1033 .compat_setsockopt = compat_sock_common_setsockopt,
1034 .compat_getsockopt = compat_sock_common_getsockopt,
1035 .compat_ioctl = inet_compat_ioctl,
1036#endif
1037};
1038EXPORT_SYMBOL(inet_dgram_ops);
1039
1040/*
1041 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1042 * udp_poll
1043 */
1044static const struct proto_ops inet_sockraw_ops = {
1045 .family = PF_INET,
1046 .owner = THIS_MODULE,
1047 .release = inet_release,
1048 .bind = inet_bind,
1049 .connect = inet_dgram_connect,
1050 .socketpair = sock_no_socketpair,
1051 .accept = sock_no_accept,
1052 .getname = inet_getname,
1053 .poll = datagram_poll,
1054 .ioctl = inet_ioctl,
1055 .listen = sock_no_listen,
1056 .shutdown = inet_shutdown,
1057 .setsockopt = sock_common_setsockopt,
1058 .getsockopt = sock_common_getsockopt,
1059 .sendmsg = inet_sendmsg,
1060 .recvmsg = inet_recvmsg,
1061 .mmap = sock_no_mmap,
1062 .sendpage = inet_sendpage,
1063#ifdef CONFIG_COMPAT
1064 .compat_setsockopt = compat_sock_common_setsockopt,
1065 .compat_getsockopt = compat_sock_common_getsockopt,
1066 .compat_ioctl = inet_compat_ioctl,
1067#endif
1068};
1069
1070static const struct net_proto_family inet_family_ops = {
1071 .family = PF_INET,
1072 .create = inet_create,
1073 .owner = THIS_MODULE,
1074};
1075
1076/* Upon startup we insert all the elements in inetsw_array[] into
1077 * the linked list inetsw.
1078 */
1079static struct inet_protosw inetsw_array[] =
1080{
1081 {
1082 .type = SOCK_STREAM,
1083 .protocol = IPPROTO_TCP,
1084 .prot = &tcp_prot,
1085 .ops = &inet_stream_ops,
1086 .flags = INET_PROTOSW_PERMANENT |
1087 INET_PROTOSW_ICSK,
1088 },
1089
1090 {
1091 .type = SOCK_DGRAM,
1092 .protocol = IPPROTO_UDP,
1093 .prot = &udp_prot,
1094 .ops = &inet_dgram_ops,
1095 .flags = INET_PROTOSW_PERMANENT,
1096 },
1097
1098 {
1099 .type = SOCK_DGRAM,
1100 .protocol = IPPROTO_ICMP,
1101 .prot = &ping_prot,
1102 .ops = &inet_sockraw_ops,
1103 .flags = INET_PROTOSW_REUSE,
1104 },
1105
1106 {
1107 .type = SOCK_RAW,
1108 .protocol = IPPROTO_IP, /* wild card */
1109 .prot = &raw_prot,
1110 .ops = &inet_sockraw_ops,
1111 .flags = INET_PROTOSW_REUSE,
1112 }
1113};
1114
1115#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1116
1117void inet_register_protosw(struct inet_protosw *p)
1118{
1119 struct list_head *lh;
1120 struct inet_protosw *answer;
1121 int protocol = p->protocol;
1122 struct list_head *last_perm;
1123
1124 spin_lock_bh(&inetsw_lock);
1125
1126 if (p->type >= SOCK_MAX)
1127 goto out_illegal;
1128
1129 /* If we are trying to override a permanent protocol, bail. */
1130 last_perm = &inetsw[p->type];
1131 list_for_each(lh, &inetsw[p->type]) {
1132 answer = list_entry(lh, struct inet_protosw, list);
1133 /* Check only the non-wild match. */
1134 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1135 break;
1136 if (protocol == answer->protocol)
1137 goto out_permanent;
1138 last_perm = lh;
1139 }
1140
1141 /* Add the new entry after the last permanent entry if any, so that
1142 * the new entry does not override a permanent entry when matched with
1143 * a wild-card protocol. But it is allowed to override any existing
1144 * non-permanent entry. This means that when we remove this entry, the
1145 * system automatically returns to the old behavior.
1146 */
1147 list_add_rcu(&p->list, last_perm);
1148out:
1149 spin_unlock_bh(&inetsw_lock);
1150
1151 return;
1152
1153out_permanent:
1154 pr_err("Attempt to override permanent protocol %d\n", protocol);
1155 goto out;
1156
1157out_illegal:
1158 pr_err("Ignoring attempt to register invalid socket type %d\n",
1159 p->type);
1160 goto out;
1161}
1162EXPORT_SYMBOL(inet_register_protosw);
1163
1164void inet_unregister_protosw(struct inet_protosw *p)
1165{
1166 if (INET_PROTOSW_PERMANENT & p->flags) {
1167 pr_err("Attempt to unregister permanent protocol %d\n",
1168 p->protocol);
1169 } else {
1170 spin_lock_bh(&inetsw_lock);
1171 list_del_rcu(&p->list);
1172 spin_unlock_bh(&inetsw_lock);
1173
1174 synchronize_net();
1175 }
1176}
1177EXPORT_SYMBOL(inet_unregister_protosw);
1178
1179static int inet_sk_reselect_saddr(struct sock *sk)
1180{
1181 struct inet_sock *inet = inet_sk(sk);
1182 __be32 old_saddr = inet->inet_saddr;
1183 __be32 daddr = inet->inet_daddr;
1184 struct flowi4 *fl4;
1185 struct rtable *rt;
1186 __be32 new_saddr;
1187 struct ip_options_rcu *inet_opt;
1188
1189 inet_opt = rcu_dereference_protected(inet->inet_opt,
1190 lockdep_sock_is_held(sk));
1191 if (inet_opt && inet_opt->opt.srr)
1192 daddr = inet_opt->opt.faddr;
1193
1194 /* Query new route. */
1195 fl4 = &inet->cork.fl.u.ip4;
1196 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1197 sk->sk_bound_dev_if, sk->sk_protocol,
1198 inet->inet_sport, inet->inet_dport, sk);
1199 if (IS_ERR(rt))
1200 return PTR_ERR(rt);
1201
1202 sk_setup_caps(sk, &rt->dst);
1203
1204 new_saddr = fl4->saddr;
1205
1206 if (new_saddr == old_saddr)
1207 return 0;
1208
1209 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1210 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1211 __func__, &old_saddr, &new_saddr);
1212 }
1213
1214 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1215
1216 /*
1217 * XXX The only one ugly spot where we need to
1218 * XXX really change the sockets identity after
1219 * XXX it has entered the hashes. -DaveM
1220 *
1221 * Besides that, it does not check for connection
1222 * uniqueness. Wait for troubles.
1223 */
1224 return __sk_prot_rehash(sk);
1225}
1226
1227int inet_sk_rebuild_header(struct sock *sk)
1228{
1229 struct inet_sock *inet = inet_sk(sk);
1230 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1231 __be32 daddr;
1232 struct ip_options_rcu *inet_opt;
1233 struct flowi4 *fl4;
1234 int err;
1235
1236 /* Route is OK, nothing to do. */
1237 if (rt)
1238 return 0;
1239
1240 /* Reroute. */
1241 rcu_read_lock();
1242 inet_opt = rcu_dereference(inet->inet_opt);
1243 daddr = inet->inet_daddr;
1244 if (inet_opt && inet_opt->opt.srr)
1245 daddr = inet_opt->opt.faddr;
1246 rcu_read_unlock();
1247 fl4 = &inet->cork.fl.u.ip4;
1248 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1249 inet->inet_dport, inet->inet_sport,
1250 sk->sk_protocol, RT_CONN_FLAGS(sk),
1251 sk->sk_bound_dev_if);
1252 if (!IS_ERR(rt)) {
1253 err = 0;
1254 sk_setup_caps(sk, &rt->dst);
1255 } else {
1256 err = PTR_ERR(rt);
1257
1258 /* Routing failed... */
1259 sk->sk_route_caps = 0;
1260 /*
1261 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1262 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1263 */
1264 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1265 sk->sk_state != TCP_SYN_SENT ||
1266 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1267 (err = inet_sk_reselect_saddr(sk)) != 0)
1268 sk->sk_err_soft = -err;
1269 }
1270
1271 return err;
1272}
1273EXPORT_SYMBOL(inet_sk_rebuild_header);
1274
1275void inet_sk_set_state(struct sock *sk, int state)
1276{
1277 trace_inet_sock_set_state(sk, sk->sk_state, state);
1278 sk->sk_state = state;
1279}
1280EXPORT_SYMBOL(inet_sk_set_state);
1281
1282void inet_sk_state_store(struct sock *sk, int newstate)
1283{
1284 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1285 smp_store_release(&sk->sk_state, newstate);
1286}
1287
1288struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1289 netdev_features_t features)
1290{
1291 bool udpfrag = false, fixedid = false, gso_partial, encap;
1292 struct sk_buff *segs = ERR_PTR(-EINVAL);
1293 const struct net_offload *ops;
1294 unsigned int offset = 0;
1295 struct iphdr *iph;
1296 int proto, tot_len;
1297 int nhoff;
1298 int ihl;
1299 int id;
1300
1301 skb_reset_network_header(skb);
1302 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1303 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1304 goto out;
1305
1306 iph = ip_hdr(skb);
1307 ihl = iph->ihl * 4;
1308 if (ihl < sizeof(*iph))
1309 goto out;
1310
1311 id = ntohs(iph->id);
1312 proto = iph->protocol;
1313
1314 /* Warning: after this point, iph might be no longer valid */
1315 if (unlikely(!pskb_may_pull(skb, ihl)))
1316 goto out;
1317 __skb_pull(skb, ihl);
1318
1319 encap = SKB_GSO_CB(skb)->encap_level > 0;
1320 if (encap)
1321 features &= skb->dev->hw_enc_features;
1322 SKB_GSO_CB(skb)->encap_level += ihl;
1323
1324 skb_reset_transport_header(skb);
1325
1326 segs = ERR_PTR(-EPROTONOSUPPORT);
1327
1328 if (!skb->encapsulation || encap) {
1329 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1330 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1331
1332 /* fixed ID is invalid if DF bit is not set */
1333 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1334 goto out;
1335 }
1336
1337 ops = rcu_dereference(inet_offloads[proto]);
1338 if (likely(ops && ops->callbacks.gso_segment))
1339 segs = ops->callbacks.gso_segment(skb, features);
1340
1341 if (IS_ERR_OR_NULL(segs))
1342 goto out;
1343
1344 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1345
1346 skb = segs;
1347 do {
1348 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1349 if (udpfrag) {
1350 iph->frag_off = htons(offset >> 3);
1351 if (skb->next)
1352 iph->frag_off |= htons(IP_MF);
1353 offset += skb->len - nhoff - ihl;
1354 tot_len = skb->len - nhoff;
1355 } else if (skb_is_gso(skb)) {
1356 if (!fixedid) {
1357 iph->id = htons(id);
1358 id += skb_shinfo(skb)->gso_segs;
1359 }
1360
1361 if (gso_partial)
1362 tot_len = skb_shinfo(skb)->gso_size +
1363 SKB_GSO_CB(skb)->data_offset +
1364 skb->head - (unsigned char *)iph;
1365 else
1366 tot_len = skb->len - nhoff;
1367 } else {
1368 if (!fixedid)
1369 iph->id = htons(id++);
1370 tot_len = skb->len - nhoff;
1371 }
1372 iph->tot_len = htons(tot_len);
1373 ip_send_check(iph);
1374 if (encap)
1375 skb_reset_inner_headers(skb);
1376 skb->network_header = (u8 *)iph - skb->head;
1377 } while ((skb = skb->next));
1378
1379out:
1380 return segs;
1381}
1382EXPORT_SYMBOL(inet_gso_segment);
1383
1384struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb)
1385{
1386 const struct net_offload *ops;
1387 struct sk_buff **pp = NULL;
1388 struct sk_buff *p;
1389 const struct iphdr *iph;
1390 unsigned int hlen;
1391 unsigned int off;
1392 unsigned int id;
1393 int flush = 1;
1394 int proto;
1395
1396 off = skb_gro_offset(skb);
1397 hlen = off + sizeof(*iph);
1398 iph = skb_gro_header_fast(skb, off);
1399 if (skb_gro_header_hard(skb, hlen)) {
1400 iph = skb_gro_header_slow(skb, hlen, off);
1401 if (unlikely(!iph))
1402 goto out;
1403 }
1404
1405 proto = iph->protocol;
1406
1407 rcu_read_lock();
1408 ops = rcu_dereference(inet_offloads[proto]);
1409 if (!ops || !ops->callbacks.gro_receive)
1410 goto out_unlock;
1411
1412 if (*(u8 *)iph != 0x45)
1413 goto out_unlock;
1414
1415 if (ip_is_fragment(iph))
1416 goto out_unlock;
1417
1418 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1419 goto out_unlock;
1420
1421 id = ntohl(*(__be32 *)&iph->id);
1422 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1423 id >>= 16;
1424
1425 for (p = *head; p; p = p->next) {
1426 struct iphdr *iph2;
1427 u16 flush_id;
1428
1429 if (!NAPI_GRO_CB(p)->same_flow)
1430 continue;
1431
1432 iph2 = (struct iphdr *)(p->data + off);
1433 /* The above works because, with the exception of the top
1434 * (inner most) layer, we only aggregate pkts with the same
1435 * hdr length so all the hdrs we'll need to verify will start
1436 * at the same offset.
1437 */
1438 if ((iph->protocol ^ iph2->protocol) |
1439 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1440 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1441 NAPI_GRO_CB(p)->same_flow = 0;
1442 continue;
1443 }
1444
1445 /* All fields must match except length and checksum. */
1446 NAPI_GRO_CB(p)->flush |=
1447 (iph->ttl ^ iph2->ttl) |
1448 (iph->tos ^ iph2->tos) |
1449 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1450
1451 NAPI_GRO_CB(p)->flush |= flush;
1452
1453 /* We need to store of the IP ID check to be included later
1454 * when we can verify that this packet does in fact belong
1455 * to a given flow.
1456 */
1457 flush_id = (u16)(id - ntohs(iph2->id));
1458
1459 /* This bit of code makes it much easier for us to identify
1460 * the cases where we are doing atomic vs non-atomic IP ID
1461 * checks. Specifically an atomic check can return IP ID
1462 * values 0 - 0xFFFF, while a non-atomic check can only
1463 * return 0 or 0xFFFF.
1464 */
1465 if (!NAPI_GRO_CB(p)->is_atomic ||
1466 !(iph->frag_off & htons(IP_DF))) {
1467 flush_id ^= NAPI_GRO_CB(p)->count;
1468 flush_id = flush_id ? 0xFFFF : 0;
1469 }
1470
1471 /* If the previous IP ID value was based on an atomic
1472 * datagram we can overwrite the value and ignore it.
1473 */
1474 if (NAPI_GRO_CB(skb)->is_atomic)
1475 NAPI_GRO_CB(p)->flush_id = flush_id;
1476 else
1477 NAPI_GRO_CB(p)->flush_id |= flush_id;
1478 }
1479
1480 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1481 NAPI_GRO_CB(skb)->flush |= flush;
1482 skb_set_network_header(skb, off);
1483 /* The above will be needed by the transport layer if there is one
1484 * immediately following this IP hdr.
1485 */
1486
1487 /* Note : No need to call skb_gro_postpull_rcsum() here,
1488 * as we already checked checksum over ipv4 header was 0
1489 */
1490 skb_gro_pull(skb, sizeof(*iph));
1491 skb_set_transport_header(skb, skb_gro_offset(skb));
1492
1493 pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
1494
1495out_unlock:
1496 rcu_read_unlock();
1497
1498out:
1499 skb_gro_flush_final(skb, pp, flush);
1500
1501 return pp;
1502}
1503EXPORT_SYMBOL(inet_gro_receive);
1504
1505static struct sk_buff **ipip_gro_receive(struct sk_buff **head,
1506 struct sk_buff *skb)
1507{
1508 if (NAPI_GRO_CB(skb)->encap_mark) {
1509 NAPI_GRO_CB(skb)->flush = 1;
1510 return NULL;
1511 }
1512
1513 NAPI_GRO_CB(skb)->encap_mark = 1;
1514
1515 return inet_gro_receive(head, skb);
1516}
1517
1518#define SECONDS_PER_DAY 86400
1519
1520/* inet_current_timestamp - Return IP network timestamp
1521 *
1522 * Return milliseconds since midnight in network byte order.
1523 */
1524__be32 inet_current_timestamp(void)
1525{
1526 u32 secs;
1527 u32 msecs;
1528 struct timespec64 ts;
1529
1530 ktime_get_real_ts64(&ts);
1531
1532 /* Get secs since midnight. */
1533 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1534 /* Convert to msecs. */
1535 msecs = secs * MSEC_PER_SEC;
1536 /* Convert nsec to msec. */
1537 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1538
1539 /* Convert to network byte order. */
1540 return htonl(msecs);
1541}
1542EXPORT_SYMBOL(inet_current_timestamp);
1543
1544int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1545{
1546 if (sk->sk_family == AF_INET)
1547 return ip_recv_error(sk, msg, len, addr_len);
1548#if IS_ENABLED(CONFIG_IPV6)
1549 if (sk->sk_family == AF_INET6)
1550 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1551#endif
1552 return -EINVAL;
1553}
1554
1555int inet_gro_complete(struct sk_buff *skb, int nhoff)
1556{
1557 __be16 newlen = htons(skb->len - nhoff);
1558 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1559 const struct net_offload *ops;
1560 int proto = iph->protocol;
1561 int err = -ENOSYS;
1562
1563 if (skb->encapsulation) {
1564 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1565 skb_set_inner_network_header(skb, nhoff);
1566 }
1567
1568 csum_replace2(&iph->check, iph->tot_len, newlen);
1569 iph->tot_len = newlen;
1570
1571 rcu_read_lock();
1572 ops = rcu_dereference(inet_offloads[proto]);
1573 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1574 goto out_unlock;
1575
1576 /* Only need to add sizeof(*iph) to get to the next hdr below
1577 * because any hdr with option will have been flushed in
1578 * inet_gro_receive().
1579 */
1580 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1581
1582out_unlock:
1583 rcu_read_unlock();
1584
1585 return err;
1586}
1587EXPORT_SYMBOL(inet_gro_complete);
1588
1589static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1590{
1591 skb->encapsulation = 1;
1592 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1593 return inet_gro_complete(skb, nhoff);
1594}
1595
1596int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1597 unsigned short type, unsigned char protocol,
1598 struct net *net)
1599{
1600 struct socket *sock;
1601 int rc = sock_create_kern(net, family, type, protocol, &sock);
1602
1603 if (rc == 0) {
1604 *sk = sock->sk;
1605 (*sk)->sk_allocation = GFP_ATOMIC;
1606 /*
1607 * Unhash it so that IP input processing does not even see it,
1608 * we do not wish this socket to see incoming packets.
1609 */
1610 (*sk)->sk_prot->unhash(*sk);
1611 }
1612 return rc;
1613}
1614EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1615
1616u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1617{
1618 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1619}
1620EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1621
1622unsigned long snmp_fold_field(void __percpu *mib, int offt)
1623{
1624 unsigned long res = 0;
1625 int i;
1626
1627 for_each_possible_cpu(i)
1628 res += snmp_get_cpu_field(mib, i, offt);
1629 return res;
1630}
1631EXPORT_SYMBOL_GPL(snmp_fold_field);
1632
1633#if BITS_PER_LONG==32
1634
1635u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1636 size_t syncp_offset)
1637{
1638 void *bhptr;
1639 struct u64_stats_sync *syncp;
1640 u64 v;
1641 unsigned int start;
1642
1643 bhptr = per_cpu_ptr(mib, cpu);
1644 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1645 do {
1646 start = u64_stats_fetch_begin_irq(syncp);
1647 v = *(((u64 *)bhptr) + offt);
1648 } while (u64_stats_fetch_retry_irq(syncp, start));
1649
1650 return v;
1651}
1652EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1653
1654u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1655{
1656 u64 res = 0;
1657 int cpu;
1658
1659 for_each_possible_cpu(cpu) {
1660 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1661 }
1662 return res;
1663}
1664EXPORT_SYMBOL_GPL(snmp_fold_field64);
1665#endif
1666
1667#ifdef CONFIG_IP_MULTICAST
1668static const struct net_protocol igmp_protocol = {
1669 .handler = igmp_rcv,
1670 .netns_ok = 1,
1671};
1672#endif
1673
1674/* thinking of making this const? Don't.
1675 * early_demux can change based on sysctl.
1676 */
1677static struct net_protocol tcp_protocol = {
1678 .early_demux = tcp_v4_early_demux,
1679 .early_demux_handler = tcp_v4_early_demux,
1680 .handler = tcp_v4_rcv,
1681 .err_handler = tcp_v4_err,
1682 .no_policy = 1,
1683 .netns_ok = 1,
1684 .icmp_strict_tag_validation = 1,
1685};
1686
1687/* thinking of making this const? Don't.
1688 * early_demux can change based on sysctl.
1689 */
1690static struct net_protocol udp_protocol = {
1691 .early_demux = udp_v4_early_demux,
1692 .early_demux_handler = udp_v4_early_demux,
1693 .handler = udp_rcv,
1694 .err_handler = udp_err,
1695 .no_policy = 1,
1696 .netns_ok = 1,
1697};
1698
1699static const struct net_protocol icmp_protocol = {
1700 .handler = icmp_rcv,
1701 .err_handler = icmp_err,
1702 .no_policy = 1,
1703 .netns_ok = 1,
1704};
1705
1706static __net_init int ipv4_mib_init_net(struct net *net)
1707{
1708 int i;
1709
1710 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1711 if (!net->mib.tcp_statistics)
1712 goto err_tcp_mib;
1713 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1714 if (!net->mib.ip_statistics)
1715 goto err_ip_mib;
1716
1717 for_each_possible_cpu(i) {
1718 struct ipstats_mib *af_inet_stats;
1719 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1720 u64_stats_init(&af_inet_stats->syncp);
1721 }
1722
1723 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1724 if (!net->mib.net_statistics)
1725 goto err_net_mib;
1726 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1727 if (!net->mib.udp_statistics)
1728 goto err_udp_mib;
1729 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1730 if (!net->mib.udplite_statistics)
1731 goto err_udplite_mib;
1732 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1733 if (!net->mib.icmp_statistics)
1734 goto err_icmp_mib;
1735 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1736 GFP_KERNEL);
1737 if (!net->mib.icmpmsg_statistics)
1738 goto err_icmpmsg_mib;
1739
1740 tcp_mib_init(net);
1741 return 0;
1742
1743err_icmpmsg_mib:
1744 free_percpu(net->mib.icmp_statistics);
1745err_icmp_mib:
1746 free_percpu(net->mib.udplite_statistics);
1747err_udplite_mib:
1748 free_percpu(net->mib.udp_statistics);
1749err_udp_mib:
1750 free_percpu(net->mib.net_statistics);
1751err_net_mib:
1752 free_percpu(net->mib.ip_statistics);
1753err_ip_mib:
1754 free_percpu(net->mib.tcp_statistics);
1755err_tcp_mib:
1756 return -ENOMEM;
1757}
1758
1759static __net_exit void ipv4_mib_exit_net(struct net *net)
1760{
1761 kfree(net->mib.icmpmsg_statistics);
1762 free_percpu(net->mib.icmp_statistics);
1763 free_percpu(net->mib.udplite_statistics);
1764 free_percpu(net->mib.udp_statistics);
1765 free_percpu(net->mib.net_statistics);
1766 free_percpu(net->mib.ip_statistics);
1767 free_percpu(net->mib.tcp_statistics);
1768}
1769
1770static __net_initdata struct pernet_operations ipv4_mib_ops = {
1771 .init = ipv4_mib_init_net,
1772 .exit = ipv4_mib_exit_net,
1773};
1774
1775static int __init init_ipv4_mibs(void)
1776{
1777 return register_pernet_subsys(&ipv4_mib_ops);
1778}
1779
1780static __net_init int inet_init_net(struct net *net)
1781{
1782 /*
1783 * Set defaults for local port range
1784 */
1785 seqlock_init(&net->ipv4.ip_local_ports.lock);
1786 net->ipv4.ip_local_ports.range[0] = 32768;
1787 net->ipv4.ip_local_ports.range[1] = 60999;
1788
1789 seqlock_init(&net->ipv4.ping_group_range.lock);
1790 /*
1791 * Sane defaults - nobody may create ping sockets.
1792 * Boot scripts should set this to distro-specific group.
1793 */
1794 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1795 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1796
1797 /* Default values for sysctl-controlled parameters.
1798 * We set them here, in case sysctl is not compiled.
1799 */
1800 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1801 net->ipv4.sysctl_ip_dynaddr = 0;
1802 net->ipv4.sysctl_ip_early_demux = 1;
1803 net->ipv4.sysctl_udp_early_demux = 1;
1804 net->ipv4.sysctl_tcp_early_demux = 1;
1805#ifdef CONFIG_SYSCTL
1806 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1807#endif
1808
1809 /* Some igmp sysctl, whose values are always used */
1810 net->ipv4.sysctl_igmp_max_memberships = 20;
1811 net->ipv4.sysctl_igmp_max_msf = 10;
1812 /* IGMP reports for link-local multicast groups are enabled by default */
1813 net->ipv4.sysctl_igmp_llm_reports = 1;
1814 net->ipv4.sysctl_igmp_qrv = 2;
1815
1816 return 0;
1817}
1818
1819static __net_exit void inet_exit_net(struct net *net)
1820{
1821}
1822
1823static __net_initdata struct pernet_operations af_inet_ops = {
1824 .init = inet_init_net,
1825 .exit = inet_exit_net,
1826};
1827
1828static int __init init_inet_pernet_ops(void)
1829{
1830 return register_pernet_subsys(&af_inet_ops);
1831}
1832
1833static int ipv4_proc_init(void);
1834
1835/*
1836 * IP protocol layer initialiser
1837 */
1838
1839static struct packet_offload ip_packet_offload __read_mostly = {
1840 .type = cpu_to_be16(ETH_P_IP),
1841 .callbacks = {
1842 .gso_segment = inet_gso_segment,
1843 .gro_receive = inet_gro_receive,
1844 .gro_complete = inet_gro_complete,
1845 },
1846};
1847
1848static const struct net_offload ipip_offload = {
1849 .callbacks = {
1850 .gso_segment = inet_gso_segment,
1851 .gro_receive = ipip_gro_receive,
1852 .gro_complete = ipip_gro_complete,
1853 },
1854};
1855
1856static int __init ipip_offload_init(void)
1857{
1858 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1859}
1860
1861static int __init ipv4_offload_init(void)
1862{
1863 /*
1864 * Add offloads
1865 */
1866 if (udpv4_offload_init() < 0)
1867 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1868 if (tcpv4_offload_init() < 0)
1869 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1870 if (ipip_offload_init() < 0)
1871 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1872
1873 dev_add_offload(&ip_packet_offload);
1874 return 0;
1875}
1876
1877fs_initcall(ipv4_offload_init);
1878
1879static struct packet_type ip_packet_type __read_mostly = {
1880 .type = cpu_to_be16(ETH_P_IP),
1881 .func = ip_rcv,
1882};
1883
1884static int __init inet_init(void)
1885{
1886 struct inet_protosw *q;
1887 struct list_head *r;
1888 int rc = -EINVAL;
1889
1890 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1891
1892 rc = proto_register(&tcp_prot, 1);
1893 if (rc)
1894 goto out;
1895
1896 rc = proto_register(&udp_prot, 1);
1897 if (rc)
1898 goto out_unregister_tcp_proto;
1899
1900 rc = proto_register(&raw_prot, 1);
1901 if (rc)
1902 goto out_unregister_udp_proto;
1903
1904 rc = proto_register(&ping_prot, 1);
1905 if (rc)
1906 goto out_unregister_raw_proto;
1907
1908 /*
1909 * Tell SOCKET that we are alive...
1910 */
1911
1912 (void)sock_register(&inet_family_ops);
1913
1914#ifdef CONFIG_SYSCTL
1915 ip_static_sysctl_init();
1916#endif
1917
1918 /*
1919 * Add all the base protocols.
1920 */
1921
1922 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1923 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1924 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1925 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1926 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1927 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1928#ifdef CONFIG_IP_MULTICAST
1929 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1930 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1931#endif
1932
1933 /* Register the socket-side information for inet_create. */
1934 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1935 INIT_LIST_HEAD(r);
1936
1937 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1938 inet_register_protosw(q);
1939
1940 /*
1941 * Set the ARP module up
1942 */
1943
1944 arp_init();
1945
1946 /*
1947 * Set the IP module up
1948 */
1949
1950 ip_init();
1951
1952 /* Setup TCP slab cache for open requests. */
1953 tcp_init();
1954
1955 /* Setup UDP memory threshold */
1956 udp_init();
1957
1958 /* Add UDP-Lite (RFC 3828) */
1959 udplite4_register();
1960
1961 ping_init();
1962
1963 /*
1964 * Set the ICMP layer up
1965 */
1966
1967 if (icmp_init() < 0)
1968 panic("Failed to create the ICMP control socket.\n");
1969
1970 /*
1971 * Initialise the multicast router
1972 */
1973#if defined(CONFIG_IP_MROUTE)
1974 if (ip_mr_init())
1975 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1976#endif
1977
1978 if (init_inet_pernet_ops())
1979 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
1980 /*
1981 * Initialise per-cpu ipv4 mibs
1982 */
1983
1984 if (init_ipv4_mibs())
1985 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1986
1987 ipv4_proc_init();
1988
1989 ipfrag_init();
1990
1991 dev_add_pack(&ip_packet_type);
1992
1993 ip_tunnel_core_init();
1994
1995 rc = 0;
1996out:
1997 return rc;
1998out_unregister_raw_proto:
1999 proto_unregister(&raw_prot);
2000out_unregister_udp_proto:
2001 proto_unregister(&udp_prot);
2002out_unregister_tcp_proto:
2003 proto_unregister(&tcp_prot);
2004 goto out;
2005}
2006
2007fs_initcall(inet_init);
2008
2009/* ------------------------------------------------------------------------ */
2010
2011#ifdef CONFIG_PROC_FS
2012static int __init ipv4_proc_init(void)
2013{
2014 int rc = 0;
2015
2016 if (raw_proc_init())
2017 goto out_raw;
2018 if (tcp4_proc_init())
2019 goto out_tcp;
2020 if (udp4_proc_init())
2021 goto out_udp;
2022 if (ping_proc_init())
2023 goto out_ping;
2024 if (ip_misc_proc_init())
2025 goto out_misc;
2026out:
2027 return rc;
2028out_misc:
2029 ping_proc_exit();
2030out_ping:
2031 udp4_proc_exit();
2032out_udp:
2033 tcp4_proc_exit();
2034out_tcp:
2035 raw_proc_exit();
2036out_raw:
2037 rc = -ENOMEM;
2038 goto out;
2039}
2040
2041#else /* CONFIG_PROC_FS */
2042static int __init ipv4_proc_init(void)
2043{
2044 return 0;
2045}
2046#endif /* CONFIG_PROC_FS */
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * PF_INET protocol family socket handler.
7 *
8 * Authors: Ross Biro
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Florian La Roche, <flla@stud.uni-sb.de>
11 * Alan Cox, <A.Cox@swansea.ac.uk>
12 *
13 * Changes (see also sock.c)
14 *
15 * piggy,
16 * Karl Knutson : Socket protocol table
17 * A.N.Kuznetsov : Socket death error in accept().
18 * John Richardson : Fix non blocking error in connect()
19 * so sockets that fail to connect
20 * don't return -EINPROGRESS.
21 * Alan Cox : Asynchronous I/O support
22 * Alan Cox : Keep correct socket pointer on sock
23 * structures
24 * when accept() ed
25 * Alan Cox : Semantics of SO_LINGER aren't state
26 * moved to close when you look carefully.
27 * With this fixed and the accept bug fixed
28 * some RPC stuff seems happier.
29 * Niibe Yutaka : 4.4BSD style write async I/O
30 * Alan Cox,
31 * Tony Gale : Fixed reuse semantics.
32 * Alan Cox : bind() shouldn't abort existing but dead
33 * sockets. Stops FTP netin:.. I hope.
34 * Alan Cox : bind() works correctly for RAW sockets.
35 * Note that FreeBSD at least was broken
36 * in this respect so be careful with
37 * compatibility tests...
38 * Alan Cox : routing cache support
39 * Alan Cox : memzero the socket structure for
40 * compactness.
41 * Matt Day : nonblock connect error handler
42 * Alan Cox : Allow large numbers of pending sockets
43 * (eg for big web sites), but only if
44 * specifically application requested.
45 * Alan Cox : New buffering throughout IP. Used
46 * dumbly.
47 * Alan Cox : New buffering now used smartly.
48 * Alan Cox : BSD rather than common sense
49 * interpretation of listen.
50 * Germano Caronni : Assorted small races.
51 * Alan Cox : sendmsg/recvmsg basic support.
52 * Alan Cox : Only sendmsg/recvmsg now supported.
53 * Alan Cox : Locked down bind (see security list).
54 * Alan Cox : Loosened bind a little.
55 * Mike McLagan : ADD/DEL DLCI Ioctls
56 * Willy Konynenberg : Transparent proxying support.
57 * David S. Miller : New socket lookup architecture.
58 * Some other random speedups.
59 * Cyrus Durgin : Cleaned up file for kmod hacks.
60 * Andi Kleen : Fix inet_stream_connect TCP race.
61 *
62 * This program is free software; you can redistribute it and/or
63 * modify it under the terms of the GNU General Public License
64 * as published by the Free Software Foundation; either version
65 * 2 of the License, or (at your option) any later version.
66 */
67
68#define pr_fmt(fmt) "IPv4: " fmt
69
70#include <linux/err.h>
71#include <linux/errno.h>
72#include <linux/types.h>
73#include <linux/socket.h>
74#include <linux/in.h>
75#include <linux/kernel.h>
76#include <linux/kmod.h>
77#include <linux/sched.h>
78#include <linux/timer.h>
79#include <linux/string.h>
80#include <linux/sockios.h>
81#include <linux/net.h>
82#include <linux/capability.h>
83#include <linux/fcntl.h>
84#include <linux/mm.h>
85#include <linux/interrupt.h>
86#include <linux/stat.h>
87#include <linux/init.h>
88#include <linux/poll.h>
89#include <linux/netfilter_ipv4.h>
90#include <linux/random.h>
91#include <linux/slab.h>
92
93#include <linux/uaccess.h>
94
95#include <linux/inet.h>
96#include <linux/igmp.h>
97#include <linux/inetdevice.h>
98#include <linux/netdevice.h>
99#include <net/checksum.h>
100#include <net/ip.h>
101#include <net/protocol.h>
102#include <net/arp.h>
103#include <net/route.h>
104#include <net/ip_fib.h>
105#include <net/inet_connection_sock.h>
106#include <net/tcp.h>
107#include <net/udp.h>
108#include <net/udplite.h>
109#include <net/ping.h>
110#include <linux/skbuff.h>
111#include <net/sock.h>
112#include <net/raw.h>
113#include <net/icmp.h>
114#include <net/inet_common.h>
115#include <net/ip_tunnels.h>
116#include <net/xfrm.h>
117#include <net/net_namespace.h>
118#include <net/secure_seq.h>
119#ifdef CONFIG_IP_MROUTE
120#include <linux/mroute.h>
121#endif
122#include <net/l3mdev.h>
123
124
125/* The inetsw table contains everything that inet_create needs to
126 * build a new socket.
127 */
128static struct list_head inetsw[SOCK_MAX];
129static DEFINE_SPINLOCK(inetsw_lock);
130
131/* New destruction routine */
132
133void inet_sock_destruct(struct sock *sk)
134{
135 struct inet_sock *inet = inet_sk(sk);
136
137 __skb_queue_purge(&sk->sk_receive_queue);
138 __skb_queue_purge(&sk->sk_error_queue);
139
140 sk_mem_reclaim(sk);
141
142 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
143 pr_err("Attempt to release TCP socket in state %d %p\n",
144 sk->sk_state, sk);
145 return;
146 }
147 if (!sock_flag(sk, SOCK_DEAD)) {
148 pr_err("Attempt to release alive inet socket %p\n", sk);
149 return;
150 }
151
152 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
153 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
154 WARN_ON(sk->sk_wmem_queued);
155 WARN_ON(sk->sk_forward_alloc);
156
157 kfree(rcu_dereference_protected(inet->inet_opt, 1));
158 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
159 dst_release(sk->sk_rx_dst);
160 sk_refcnt_debug_dec(sk);
161}
162EXPORT_SYMBOL(inet_sock_destruct);
163
164/*
165 * The routines beyond this point handle the behaviour of an AF_INET
166 * socket object. Mostly it punts to the subprotocols of IP to do
167 * the work.
168 */
169
170/*
171 * Automatically bind an unbound socket.
172 */
173
174static int inet_autobind(struct sock *sk)
175{
176 struct inet_sock *inet;
177 /* We may need to bind the socket. */
178 lock_sock(sk);
179 inet = inet_sk(sk);
180 if (!inet->inet_num) {
181 if (sk->sk_prot->get_port(sk, 0)) {
182 release_sock(sk);
183 return -EAGAIN;
184 }
185 inet->inet_sport = htons(inet->inet_num);
186 }
187 release_sock(sk);
188 return 0;
189}
190
191/*
192 * Move a socket into listening state.
193 */
194int inet_listen(struct socket *sock, int backlog)
195{
196 struct sock *sk = sock->sk;
197 unsigned char old_state;
198 int err;
199
200 lock_sock(sk);
201
202 err = -EINVAL;
203 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
204 goto out;
205
206 old_state = sk->sk_state;
207 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
208 goto out;
209
210 /* Really, if the socket is already in listen state
211 * we can only allow the backlog to be adjusted.
212 */
213 if (old_state != TCP_LISTEN) {
214 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
215 * Note that only TCP sockets (SOCK_STREAM) will reach here.
216 * Also fastopen backlog may already been set via the option
217 * because the socket was in TCP_LISTEN state previously but
218 * was shutdown() rather than close().
219 */
220 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
221 (sysctl_tcp_fastopen & TFO_SERVER_ENABLE) &&
222 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
223 fastopen_queue_tune(sk, backlog);
224 tcp_fastopen_init_key_once(true);
225 }
226
227 err = inet_csk_listen_start(sk, backlog);
228 if (err)
229 goto out;
230 }
231 sk->sk_max_ack_backlog = backlog;
232 err = 0;
233
234out:
235 release_sock(sk);
236 return err;
237}
238EXPORT_SYMBOL(inet_listen);
239
240/*
241 * Create an inet socket.
242 */
243
244static int inet_create(struct net *net, struct socket *sock, int protocol,
245 int kern)
246{
247 struct sock *sk;
248 struct inet_protosw *answer;
249 struct inet_sock *inet;
250 struct proto *answer_prot;
251 unsigned char answer_flags;
252 int try_loading_module = 0;
253 int err;
254
255 if (protocol < 0 || protocol >= IPPROTO_MAX)
256 return -EINVAL;
257
258 sock->state = SS_UNCONNECTED;
259
260 /* Look for the requested type/protocol pair. */
261lookup_protocol:
262 err = -ESOCKTNOSUPPORT;
263 rcu_read_lock();
264 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
265
266 err = 0;
267 /* Check the non-wild match. */
268 if (protocol == answer->protocol) {
269 if (protocol != IPPROTO_IP)
270 break;
271 } else {
272 /* Check for the two wild cases. */
273 if (IPPROTO_IP == protocol) {
274 protocol = answer->protocol;
275 break;
276 }
277 if (IPPROTO_IP == answer->protocol)
278 break;
279 }
280 err = -EPROTONOSUPPORT;
281 }
282
283 if (unlikely(err)) {
284 if (try_loading_module < 2) {
285 rcu_read_unlock();
286 /*
287 * Be more specific, e.g. net-pf-2-proto-132-type-1
288 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
289 */
290 if (++try_loading_module == 1)
291 request_module("net-pf-%d-proto-%d-type-%d",
292 PF_INET, protocol, sock->type);
293 /*
294 * Fall back to generic, e.g. net-pf-2-proto-132
295 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
296 */
297 else
298 request_module("net-pf-%d-proto-%d",
299 PF_INET, protocol);
300 goto lookup_protocol;
301 } else
302 goto out_rcu_unlock;
303 }
304
305 err = -EPERM;
306 if (sock->type == SOCK_RAW && !kern &&
307 !ns_capable(net->user_ns, CAP_NET_RAW))
308 goto out_rcu_unlock;
309
310 sock->ops = answer->ops;
311 answer_prot = answer->prot;
312 answer_flags = answer->flags;
313 rcu_read_unlock();
314
315 WARN_ON(!answer_prot->slab);
316
317 err = -ENOBUFS;
318 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
319 if (!sk)
320 goto out;
321
322 err = 0;
323 if (INET_PROTOSW_REUSE & answer_flags)
324 sk->sk_reuse = SK_CAN_REUSE;
325
326 inet = inet_sk(sk);
327 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
328
329 inet->nodefrag = 0;
330
331 if (SOCK_RAW == sock->type) {
332 inet->inet_num = protocol;
333 if (IPPROTO_RAW == protocol)
334 inet->hdrincl = 1;
335 }
336
337 if (net->ipv4.sysctl_ip_no_pmtu_disc)
338 inet->pmtudisc = IP_PMTUDISC_DONT;
339 else
340 inet->pmtudisc = IP_PMTUDISC_WANT;
341
342 inet->inet_id = 0;
343
344 sock_init_data(sock, sk);
345
346 sk->sk_destruct = inet_sock_destruct;
347 sk->sk_protocol = protocol;
348 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
349
350 inet->uc_ttl = -1;
351 inet->mc_loop = 1;
352 inet->mc_ttl = 1;
353 inet->mc_all = 1;
354 inet->mc_index = 0;
355 inet->mc_list = NULL;
356 inet->rcv_tos = 0;
357
358 sk_refcnt_debug_inc(sk);
359
360 if (inet->inet_num) {
361 /* It assumes that any protocol which allows
362 * the user to assign a number at socket
363 * creation time automatically
364 * shares.
365 */
366 inet->inet_sport = htons(inet->inet_num);
367 /* Add to protocol hash chains. */
368 err = sk->sk_prot->hash(sk);
369 if (err) {
370 sk_common_release(sk);
371 goto out;
372 }
373 }
374
375 if (sk->sk_prot->init) {
376 err = sk->sk_prot->init(sk);
377 if (err) {
378 sk_common_release(sk);
379 goto out;
380 }
381 }
382
383 if (!kern) {
384 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
385 if (err) {
386 sk_common_release(sk);
387 goto out;
388 }
389 }
390out:
391 return err;
392out_rcu_unlock:
393 rcu_read_unlock();
394 goto out;
395}
396
397
398/*
399 * The peer socket should always be NULL (or else). When we call this
400 * function we are destroying the object and from then on nobody
401 * should refer to it.
402 */
403int inet_release(struct socket *sock)
404{
405 struct sock *sk = sock->sk;
406
407 if (sk) {
408 long timeout;
409
410 /* Applications forget to leave groups before exiting */
411 ip_mc_drop_socket(sk);
412
413 /* If linger is set, we don't return until the close
414 * is complete. Otherwise we return immediately. The
415 * actually closing is done the same either way.
416 *
417 * If the close is due to the process exiting, we never
418 * linger..
419 */
420 timeout = 0;
421 if (sock_flag(sk, SOCK_LINGER) &&
422 !(current->flags & PF_EXITING))
423 timeout = sk->sk_lingertime;
424 sock->sk = NULL;
425 sk->sk_prot->close(sk, timeout);
426 }
427 return 0;
428}
429EXPORT_SYMBOL(inet_release);
430
431int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
432{
433 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
434 struct sock *sk = sock->sk;
435 struct inet_sock *inet = inet_sk(sk);
436 struct net *net = sock_net(sk);
437 unsigned short snum;
438 int chk_addr_ret;
439 u32 tb_id = RT_TABLE_LOCAL;
440 int err;
441
442 /* If the socket has its own bind function then use it. (RAW) */
443 if (sk->sk_prot->bind) {
444 err = sk->sk_prot->bind(sk, uaddr, addr_len);
445 goto out;
446 }
447 err = -EINVAL;
448 if (addr_len < sizeof(struct sockaddr_in))
449 goto out;
450
451 if (addr->sin_family != AF_INET) {
452 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
453 * only if s_addr is INADDR_ANY.
454 */
455 err = -EAFNOSUPPORT;
456 if (addr->sin_family != AF_UNSPEC ||
457 addr->sin_addr.s_addr != htonl(INADDR_ANY))
458 goto out;
459 }
460
461 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
462 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
463
464 /* Not specified by any standard per-se, however it breaks too
465 * many applications when removed. It is unfortunate since
466 * allowing applications to make a non-local bind solves
467 * several problems with systems using dynamic addressing.
468 * (ie. your servers still start up even if your ISDN link
469 * is temporarily down)
470 */
471 err = -EADDRNOTAVAIL;
472 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
473 !(inet->freebind || inet->transparent) &&
474 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
475 chk_addr_ret != RTN_LOCAL &&
476 chk_addr_ret != RTN_MULTICAST &&
477 chk_addr_ret != RTN_BROADCAST)
478 goto out;
479
480 snum = ntohs(addr->sin_port);
481 err = -EACCES;
482 if (snum && snum < PROT_SOCK &&
483 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
484 goto out;
485
486 /* We keep a pair of addresses. rcv_saddr is the one
487 * used by hash lookups, and saddr is used for transmit.
488 *
489 * In the BSD API these are the same except where it
490 * would be illegal to use them (multicast/broadcast) in
491 * which case the sending device address is used.
492 */
493 lock_sock(sk);
494
495 /* Check these errors (active socket, double bind). */
496 err = -EINVAL;
497 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
498 goto out_release_sock;
499
500 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
501 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
502 inet->inet_saddr = 0; /* Use device */
503
504 /* Make sure we are allowed to bind here. */
505 if ((snum || !inet->bind_address_no_port) &&
506 sk->sk_prot->get_port(sk, snum)) {
507 inet->inet_saddr = inet->inet_rcv_saddr = 0;
508 err = -EADDRINUSE;
509 goto out_release_sock;
510 }
511
512 if (inet->inet_rcv_saddr)
513 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
514 if (snum)
515 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
516 inet->inet_sport = htons(inet->inet_num);
517 inet->inet_daddr = 0;
518 inet->inet_dport = 0;
519 sk_dst_reset(sk);
520 err = 0;
521out_release_sock:
522 release_sock(sk);
523out:
524 return err;
525}
526EXPORT_SYMBOL(inet_bind);
527
528int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
529 int addr_len, int flags)
530{
531 struct sock *sk = sock->sk;
532
533 if (addr_len < sizeof(uaddr->sa_family))
534 return -EINVAL;
535 if (uaddr->sa_family == AF_UNSPEC)
536 return sk->sk_prot->disconnect(sk, flags);
537
538 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
539 return -EAGAIN;
540 return sk->sk_prot->connect(sk, uaddr, addr_len);
541}
542EXPORT_SYMBOL(inet_dgram_connect);
543
544static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
545{
546 DEFINE_WAIT_FUNC(wait, woken_wake_function);
547
548 add_wait_queue(sk_sleep(sk), &wait);
549 sk->sk_write_pending += writebias;
550
551 /* Basic assumption: if someone sets sk->sk_err, he _must_
552 * change state of the socket from TCP_SYN_*.
553 * Connect() does not allow to get error notifications
554 * without closing the socket.
555 */
556 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
557 release_sock(sk);
558 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
559 lock_sock(sk);
560 if (signal_pending(current) || !timeo)
561 break;
562 }
563 remove_wait_queue(sk_sleep(sk), &wait);
564 sk->sk_write_pending -= writebias;
565 return timeo;
566}
567
568/*
569 * Connect to a remote host. There is regrettably still a little
570 * TCP 'magic' in here.
571 */
572int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
573 int addr_len, int flags)
574{
575 struct sock *sk = sock->sk;
576 int err;
577 long timeo;
578
579 if (addr_len < sizeof(uaddr->sa_family))
580 return -EINVAL;
581
582 if (uaddr->sa_family == AF_UNSPEC) {
583 err = sk->sk_prot->disconnect(sk, flags);
584 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
585 goto out;
586 }
587
588 switch (sock->state) {
589 default:
590 err = -EINVAL;
591 goto out;
592 case SS_CONNECTED:
593 err = -EISCONN;
594 goto out;
595 case SS_CONNECTING:
596 err = -EALREADY;
597 /* Fall out of switch with err, set for this state */
598 break;
599 case SS_UNCONNECTED:
600 err = -EISCONN;
601 if (sk->sk_state != TCP_CLOSE)
602 goto out;
603
604 err = sk->sk_prot->connect(sk, uaddr, addr_len);
605 if (err < 0)
606 goto out;
607
608 sock->state = SS_CONNECTING;
609
610 /* Just entered SS_CONNECTING state; the only
611 * difference is that return value in non-blocking
612 * case is EINPROGRESS, rather than EALREADY.
613 */
614 err = -EINPROGRESS;
615 break;
616 }
617
618 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
619
620 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
621 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
622 tcp_sk(sk)->fastopen_req &&
623 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
624
625 /* Error code is set above */
626 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
627 goto out;
628
629 err = sock_intr_errno(timeo);
630 if (signal_pending(current))
631 goto out;
632 }
633
634 /* Connection was closed by RST, timeout, ICMP error
635 * or another process disconnected us.
636 */
637 if (sk->sk_state == TCP_CLOSE)
638 goto sock_error;
639
640 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
641 * and error was received after socket entered established state.
642 * Hence, it is handled normally after connect() return successfully.
643 */
644
645 sock->state = SS_CONNECTED;
646 err = 0;
647out:
648 return err;
649
650sock_error:
651 err = sock_error(sk) ? : -ECONNABORTED;
652 sock->state = SS_UNCONNECTED;
653 if (sk->sk_prot->disconnect(sk, flags))
654 sock->state = SS_DISCONNECTING;
655 goto out;
656}
657EXPORT_SYMBOL(__inet_stream_connect);
658
659int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
660 int addr_len, int flags)
661{
662 int err;
663
664 lock_sock(sock->sk);
665 err = __inet_stream_connect(sock, uaddr, addr_len, flags);
666 release_sock(sock->sk);
667 return err;
668}
669EXPORT_SYMBOL(inet_stream_connect);
670
671/*
672 * Accept a pending connection. The TCP layer now gives BSD semantics.
673 */
674
675int inet_accept(struct socket *sock, struct socket *newsock, int flags)
676{
677 struct sock *sk1 = sock->sk;
678 int err = -EINVAL;
679 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
680
681 if (!sk2)
682 goto do_err;
683
684 lock_sock(sk2);
685
686 sock_rps_record_flow(sk2);
687 WARN_ON(!((1 << sk2->sk_state) &
688 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
689 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
690
691 sock_graft(sk2, newsock);
692
693 newsock->state = SS_CONNECTED;
694 err = 0;
695 release_sock(sk2);
696do_err:
697 return err;
698}
699EXPORT_SYMBOL(inet_accept);
700
701
702/*
703 * This does both peername and sockname.
704 */
705int inet_getname(struct socket *sock, struct sockaddr *uaddr,
706 int *uaddr_len, int peer)
707{
708 struct sock *sk = sock->sk;
709 struct inet_sock *inet = inet_sk(sk);
710 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
711
712 sin->sin_family = AF_INET;
713 if (peer) {
714 if (!inet->inet_dport ||
715 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
716 peer == 1))
717 return -ENOTCONN;
718 sin->sin_port = inet->inet_dport;
719 sin->sin_addr.s_addr = inet->inet_daddr;
720 } else {
721 __be32 addr = inet->inet_rcv_saddr;
722 if (!addr)
723 addr = inet->inet_saddr;
724 sin->sin_port = inet->inet_sport;
725 sin->sin_addr.s_addr = addr;
726 }
727 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
728 *uaddr_len = sizeof(*sin);
729 return 0;
730}
731EXPORT_SYMBOL(inet_getname);
732
733int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
734{
735 struct sock *sk = sock->sk;
736
737 sock_rps_record_flow(sk);
738
739 /* We may need to bind the socket. */
740 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
741 inet_autobind(sk))
742 return -EAGAIN;
743
744 return sk->sk_prot->sendmsg(sk, msg, size);
745}
746EXPORT_SYMBOL(inet_sendmsg);
747
748ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
749 size_t size, int flags)
750{
751 struct sock *sk = sock->sk;
752
753 sock_rps_record_flow(sk);
754
755 /* We may need to bind the socket. */
756 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
757 inet_autobind(sk))
758 return -EAGAIN;
759
760 if (sk->sk_prot->sendpage)
761 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
762 return sock_no_sendpage(sock, page, offset, size, flags);
763}
764EXPORT_SYMBOL(inet_sendpage);
765
766int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
767 int flags)
768{
769 struct sock *sk = sock->sk;
770 int addr_len = 0;
771 int err;
772
773 sock_rps_record_flow(sk);
774
775 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
776 flags & ~MSG_DONTWAIT, &addr_len);
777 if (err >= 0)
778 msg->msg_namelen = addr_len;
779 return err;
780}
781EXPORT_SYMBOL(inet_recvmsg);
782
783int inet_shutdown(struct socket *sock, int how)
784{
785 struct sock *sk = sock->sk;
786 int err = 0;
787
788 /* This should really check to make sure
789 * the socket is a TCP socket. (WHY AC...)
790 */
791 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
792 1->2 bit 2 snds.
793 2->3 */
794 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
795 return -EINVAL;
796
797 lock_sock(sk);
798 if (sock->state == SS_CONNECTING) {
799 if ((1 << sk->sk_state) &
800 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
801 sock->state = SS_DISCONNECTING;
802 else
803 sock->state = SS_CONNECTED;
804 }
805
806 switch (sk->sk_state) {
807 case TCP_CLOSE:
808 err = -ENOTCONN;
809 /* Hack to wake up other listeners, who can poll for
810 POLLHUP, even on eg. unconnected UDP sockets -- RR */
811 default:
812 sk->sk_shutdown |= how;
813 if (sk->sk_prot->shutdown)
814 sk->sk_prot->shutdown(sk, how);
815 break;
816
817 /* Remaining two branches are temporary solution for missing
818 * close() in multithreaded environment. It is _not_ a good idea,
819 * but we have no choice until close() is repaired at VFS level.
820 */
821 case TCP_LISTEN:
822 if (!(how & RCV_SHUTDOWN))
823 break;
824 /* Fall through */
825 case TCP_SYN_SENT:
826 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
827 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
828 break;
829 }
830
831 /* Wake up anyone sleeping in poll. */
832 sk->sk_state_change(sk);
833 release_sock(sk);
834 return err;
835}
836EXPORT_SYMBOL(inet_shutdown);
837
838/*
839 * ioctl() calls you can issue on an INET socket. Most of these are
840 * device configuration and stuff and very rarely used. Some ioctls
841 * pass on to the socket itself.
842 *
843 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
844 * loads the devconfigure module does its configuring and unloads it.
845 * There's a good 20K of config code hanging around the kernel.
846 */
847
848int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
849{
850 struct sock *sk = sock->sk;
851 int err = 0;
852 struct net *net = sock_net(sk);
853
854 switch (cmd) {
855 case SIOCGSTAMP:
856 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
857 break;
858 case SIOCGSTAMPNS:
859 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
860 break;
861 case SIOCADDRT:
862 case SIOCDELRT:
863 case SIOCRTMSG:
864 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
865 break;
866 case SIOCDARP:
867 case SIOCGARP:
868 case SIOCSARP:
869 err = arp_ioctl(net, cmd, (void __user *)arg);
870 break;
871 case SIOCGIFADDR:
872 case SIOCSIFADDR:
873 case SIOCGIFBRDADDR:
874 case SIOCSIFBRDADDR:
875 case SIOCGIFNETMASK:
876 case SIOCSIFNETMASK:
877 case SIOCGIFDSTADDR:
878 case SIOCSIFDSTADDR:
879 case SIOCSIFPFLAGS:
880 case SIOCGIFPFLAGS:
881 case SIOCSIFFLAGS:
882 err = devinet_ioctl(net, cmd, (void __user *)arg);
883 break;
884 default:
885 if (sk->sk_prot->ioctl)
886 err = sk->sk_prot->ioctl(sk, cmd, arg);
887 else
888 err = -ENOIOCTLCMD;
889 break;
890 }
891 return err;
892}
893EXPORT_SYMBOL(inet_ioctl);
894
895#ifdef CONFIG_COMPAT
896static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
897{
898 struct sock *sk = sock->sk;
899 int err = -ENOIOCTLCMD;
900
901 if (sk->sk_prot->compat_ioctl)
902 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
903
904 return err;
905}
906#endif
907
908const struct proto_ops inet_stream_ops = {
909 .family = PF_INET,
910 .owner = THIS_MODULE,
911 .release = inet_release,
912 .bind = inet_bind,
913 .connect = inet_stream_connect,
914 .socketpair = sock_no_socketpair,
915 .accept = inet_accept,
916 .getname = inet_getname,
917 .poll = tcp_poll,
918 .ioctl = inet_ioctl,
919 .listen = inet_listen,
920 .shutdown = inet_shutdown,
921 .setsockopt = sock_common_setsockopt,
922 .getsockopt = sock_common_getsockopt,
923 .sendmsg = inet_sendmsg,
924 .recvmsg = inet_recvmsg,
925 .mmap = sock_no_mmap,
926 .sendpage = inet_sendpage,
927 .splice_read = tcp_splice_read,
928 .read_sock = tcp_read_sock,
929 .peek_len = tcp_peek_len,
930#ifdef CONFIG_COMPAT
931 .compat_setsockopt = compat_sock_common_setsockopt,
932 .compat_getsockopt = compat_sock_common_getsockopt,
933 .compat_ioctl = inet_compat_ioctl,
934#endif
935};
936EXPORT_SYMBOL(inet_stream_ops);
937
938const struct proto_ops inet_dgram_ops = {
939 .family = PF_INET,
940 .owner = THIS_MODULE,
941 .release = inet_release,
942 .bind = inet_bind,
943 .connect = inet_dgram_connect,
944 .socketpair = sock_no_socketpair,
945 .accept = sock_no_accept,
946 .getname = inet_getname,
947 .poll = udp_poll,
948 .ioctl = inet_ioctl,
949 .listen = sock_no_listen,
950 .shutdown = inet_shutdown,
951 .setsockopt = sock_common_setsockopt,
952 .getsockopt = sock_common_getsockopt,
953 .sendmsg = inet_sendmsg,
954 .recvmsg = inet_recvmsg,
955 .mmap = sock_no_mmap,
956 .sendpage = inet_sendpage,
957 .set_peek_off = sk_set_peek_off,
958#ifdef CONFIG_COMPAT
959 .compat_setsockopt = compat_sock_common_setsockopt,
960 .compat_getsockopt = compat_sock_common_getsockopt,
961 .compat_ioctl = inet_compat_ioctl,
962#endif
963};
964EXPORT_SYMBOL(inet_dgram_ops);
965
966/*
967 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
968 * udp_poll
969 */
970static const struct proto_ops inet_sockraw_ops = {
971 .family = PF_INET,
972 .owner = THIS_MODULE,
973 .release = inet_release,
974 .bind = inet_bind,
975 .connect = inet_dgram_connect,
976 .socketpair = sock_no_socketpair,
977 .accept = sock_no_accept,
978 .getname = inet_getname,
979 .poll = datagram_poll,
980 .ioctl = inet_ioctl,
981 .listen = sock_no_listen,
982 .shutdown = inet_shutdown,
983 .setsockopt = sock_common_setsockopt,
984 .getsockopt = sock_common_getsockopt,
985 .sendmsg = inet_sendmsg,
986 .recvmsg = inet_recvmsg,
987 .mmap = sock_no_mmap,
988 .sendpage = inet_sendpage,
989#ifdef CONFIG_COMPAT
990 .compat_setsockopt = compat_sock_common_setsockopt,
991 .compat_getsockopt = compat_sock_common_getsockopt,
992 .compat_ioctl = inet_compat_ioctl,
993#endif
994};
995
996static const struct net_proto_family inet_family_ops = {
997 .family = PF_INET,
998 .create = inet_create,
999 .owner = THIS_MODULE,
1000};
1001
1002/* Upon startup we insert all the elements in inetsw_array[] into
1003 * the linked list inetsw.
1004 */
1005static struct inet_protosw inetsw_array[] =
1006{
1007 {
1008 .type = SOCK_STREAM,
1009 .protocol = IPPROTO_TCP,
1010 .prot = &tcp_prot,
1011 .ops = &inet_stream_ops,
1012 .flags = INET_PROTOSW_PERMANENT |
1013 INET_PROTOSW_ICSK,
1014 },
1015
1016 {
1017 .type = SOCK_DGRAM,
1018 .protocol = IPPROTO_UDP,
1019 .prot = &udp_prot,
1020 .ops = &inet_dgram_ops,
1021 .flags = INET_PROTOSW_PERMANENT,
1022 },
1023
1024 {
1025 .type = SOCK_DGRAM,
1026 .protocol = IPPROTO_ICMP,
1027 .prot = &ping_prot,
1028 .ops = &inet_dgram_ops,
1029 .flags = INET_PROTOSW_REUSE,
1030 },
1031
1032 {
1033 .type = SOCK_RAW,
1034 .protocol = IPPROTO_IP, /* wild card */
1035 .prot = &raw_prot,
1036 .ops = &inet_sockraw_ops,
1037 .flags = INET_PROTOSW_REUSE,
1038 }
1039};
1040
1041#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1042
1043void inet_register_protosw(struct inet_protosw *p)
1044{
1045 struct list_head *lh;
1046 struct inet_protosw *answer;
1047 int protocol = p->protocol;
1048 struct list_head *last_perm;
1049
1050 spin_lock_bh(&inetsw_lock);
1051
1052 if (p->type >= SOCK_MAX)
1053 goto out_illegal;
1054
1055 /* If we are trying to override a permanent protocol, bail. */
1056 last_perm = &inetsw[p->type];
1057 list_for_each(lh, &inetsw[p->type]) {
1058 answer = list_entry(lh, struct inet_protosw, list);
1059 /* Check only the non-wild match. */
1060 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1061 break;
1062 if (protocol == answer->protocol)
1063 goto out_permanent;
1064 last_perm = lh;
1065 }
1066
1067 /* Add the new entry after the last permanent entry if any, so that
1068 * the new entry does not override a permanent entry when matched with
1069 * a wild-card protocol. But it is allowed to override any existing
1070 * non-permanent entry. This means that when we remove this entry, the
1071 * system automatically returns to the old behavior.
1072 */
1073 list_add_rcu(&p->list, last_perm);
1074out:
1075 spin_unlock_bh(&inetsw_lock);
1076
1077 return;
1078
1079out_permanent:
1080 pr_err("Attempt to override permanent protocol %d\n", protocol);
1081 goto out;
1082
1083out_illegal:
1084 pr_err("Ignoring attempt to register invalid socket type %d\n",
1085 p->type);
1086 goto out;
1087}
1088EXPORT_SYMBOL(inet_register_protosw);
1089
1090void inet_unregister_protosw(struct inet_protosw *p)
1091{
1092 if (INET_PROTOSW_PERMANENT & p->flags) {
1093 pr_err("Attempt to unregister permanent protocol %d\n",
1094 p->protocol);
1095 } else {
1096 spin_lock_bh(&inetsw_lock);
1097 list_del_rcu(&p->list);
1098 spin_unlock_bh(&inetsw_lock);
1099
1100 synchronize_net();
1101 }
1102}
1103EXPORT_SYMBOL(inet_unregister_protosw);
1104
1105static int inet_sk_reselect_saddr(struct sock *sk)
1106{
1107 struct inet_sock *inet = inet_sk(sk);
1108 __be32 old_saddr = inet->inet_saddr;
1109 __be32 daddr = inet->inet_daddr;
1110 struct flowi4 *fl4;
1111 struct rtable *rt;
1112 __be32 new_saddr;
1113 struct ip_options_rcu *inet_opt;
1114
1115 inet_opt = rcu_dereference_protected(inet->inet_opt,
1116 lockdep_sock_is_held(sk));
1117 if (inet_opt && inet_opt->opt.srr)
1118 daddr = inet_opt->opt.faddr;
1119
1120 /* Query new route. */
1121 fl4 = &inet->cork.fl.u.ip4;
1122 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1123 sk->sk_bound_dev_if, sk->sk_protocol,
1124 inet->inet_sport, inet->inet_dport, sk);
1125 if (IS_ERR(rt))
1126 return PTR_ERR(rt);
1127
1128 sk_setup_caps(sk, &rt->dst);
1129
1130 new_saddr = fl4->saddr;
1131
1132 if (new_saddr == old_saddr)
1133 return 0;
1134
1135 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1136 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1137 __func__, &old_saddr, &new_saddr);
1138 }
1139
1140 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1141
1142 /*
1143 * XXX The only one ugly spot where we need to
1144 * XXX really change the sockets identity after
1145 * XXX it has entered the hashes. -DaveM
1146 *
1147 * Besides that, it does not check for connection
1148 * uniqueness. Wait for troubles.
1149 */
1150 return __sk_prot_rehash(sk);
1151}
1152
1153int inet_sk_rebuild_header(struct sock *sk)
1154{
1155 struct inet_sock *inet = inet_sk(sk);
1156 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1157 __be32 daddr;
1158 struct ip_options_rcu *inet_opt;
1159 struct flowi4 *fl4;
1160 int err;
1161
1162 /* Route is OK, nothing to do. */
1163 if (rt)
1164 return 0;
1165
1166 /* Reroute. */
1167 rcu_read_lock();
1168 inet_opt = rcu_dereference(inet->inet_opt);
1169 daddr = inet->inet_daddr;
1170 if (inet_opt && inet_opt->opt.srr)
1171 daddr = inet_opt->opt.faddr;
1172 rcu_read_unlock();
1173 fl4 = &inet->cork.fl.u.ip4;
1174 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1175 inet->inet_dport, inet->inet_sport,
1176 sk->sk_protocol, RT_CONN_FLAGS(sk),
1177 sk->sk_bound_dev_if);
1178 if (!IS_ERR(rt)) {
1179 err = 0;
1180 sk_setup_caps(sk, &rt->dst);
1181 } else {
1182 err = PTR_ERR(rt);
1183
1184 /* Routing failed... */
1185 sk->sk_route_caps = 0;
1186 /*
1187 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1188 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1189 */
1190 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1191 sk->sk_state != TCP_SYN_SENT ||
1192 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1193 (err = inet_sk_reselect_saddr(sk)) != 0)
1194 sk->sk_err_soft = -err;
1195 }
1196
1197 return err;
1198}
1199EXPORT_SYMBOL(inet_sk_rebuild_header);
1200
1201struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1202 netdev_features_t features)
1203{
1204 bool udpfrag = false, fixedid = false, gso_partial, encap;
1205 struct sk_buff *segs = ERR_PTR(-EINVAL);
1206 const struct net_offload *ops;
1207 unsigned int offset = 0;
1208 struct iphdr *iph;
1209 int proto, tot_len;
1210 int nhoff;
1211 int ihl;
1212 int id;
1213
1214 skb_reset_network_header(skb);
1215 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1216 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1217 goto out;
1218
1219 iph = ip_hdr(skb);
1220 ihl = iph->ihl * 4;
1221 if (ihl < sizeof(*iph))
1222 goto out;
1223
1224 id = ntohs(iph->id);
1225 proto = iph->protocol;
1226
1227 /* Warning: after this point, iph might be no longer valid */
1228 if (unlikely(!pskb_may_pull(skb, ihl)))
1229 goto out;
1230 __skb_pull(skb, ihl);
1231
1232 encap = SKB_GSO_CB(skb)->encap_level > 0;
1233 if (encap)
1234 features &= skb->dev->hw_enc_features;
1235 SKB_GSO_CB(skb)->encap_level += ihl;
1236
1237 skb_reset_transport_header(skb);
1238
1239 segs = ERR_PTR(-EPROTONOSUPPORT);
1240
1241 if (!skb->encapsulation || encap) {
1242 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1243 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1244
1245 /* fixed ID is invalid if DF bit is not set */
1246 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1247 goto out;
1248 }
1249
1250 ops = rcu_dereference(inet_offloads[proto]);
1251 if (likely(ops && ops->callbacks.gso_segment))
1252 segs = ops->callbacks.gso_segment(skb, features);
1253
1254 if (IS_ERR_OR_NULL(segs))
1255 goto out;
1256
1257 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1258
1259 skb = segs;
1260 do {
1261 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1262 if (udpfrag) {
1263 iph->frag_off = htons(offset >> 3);
1264 if (skb->next)
1265 iph->frag_off |= htons(IP_MF);
1266 offset += skb->len - nhoff - ihl;
1267 tot_len = skb->len - nhoff;
1268 } else if (skb_is_gso(skb)) {
1269 if (!fixedid) {
1270 iph->id = htons(id);
1271 id += skb_shinfo(skb)->gso_segs;
1272 }
1273
1274 if (gso_partial)
1275 tot_len = skb_shinfo(skb)->gso_size +
1276 SKB_GSO_CB(skb)->data_offset +
1277 skb->head - (unsigned char *)iph;
1278 else
1279 tot_len = skb->len - nhoff;
1280 } else {
1281 if (!fixedid)
1282 iph->id = htons(id++);
1283 tot_len = skb->len - nhoff;
1284 }
1285 iph->tot_len = htons(tot_len);
1286 ip_send_check(iph);
1287 if (encap)
1288 skb_reset_inner_headers(skb);
1289 skb->network_header = (u8 *)iph - skb->head;
1290 } while ((skb = skb->next));
1291
1292out:
1293 return segs;
1294}
1295EXPORT_SYMBOL(inet_gso_segment);
1296
1297struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb)
1298{
1299 const struct net_offload *ops;
1300 struct sk_buff **pp = NULL;
1301 struct sk_buff *p;
1302 const struct iphdr *iph;
1303 unsigned int hlen;
1304 unsigned int off;
1305 unsigned int id;
1306 int flush = 1;
1307 int proto;
1308
1309 off = skb_gro_offset(skb);
1310 hlen = off + sizeof(*iph);
1311 iph = skb_gro_header_fast(skb, off);
1312 if (skb_gro_header_hard(skb, hlen)) {
1313 iph = skb_gro_header_slow(skb, hlen, off);
1314 if (unlikely(!iph))
1315 goto out;
1316 }
1317
1318 proto = iph->protocol;
1319
1320 rcu_read_lock();
1321 ops = rcu_dereference(inet_offloads[proto]);
1322 if (!ops || !ops->callbacks.gro_receive)
1323 goto out_unlock;
1324
1325 if (*(u8 *)iph != 0x45)
1326 goto out_unlock;
1327
1328 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1329 goto out_unlock;
1330
1331 id = ntohl(*(__be32 *)&iph->id);
1332 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1333 id >>= 16;
1334
1335 for (p = *head; p; p = p->next) {
1336 struct iphdr *iph2;
1337 u16 flush_id;
1338
1339 if (!NAPI_GRO_CB(p)->same_flow)
1340 continue;
1341
1342 iph2 = (struct iphdr *)(p->data + off);
1343 /* The above works because, with the exception of the top
1344 * (inner most) layer, we only aggregate pkts with the same
1345 * hdr length so all the hdrs we'll need to verify will start
1346 * at the same offset.
1347 */
1348 if ((iph->protocol ^ iph2->protocol) |
1349 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1350 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1351 NAPI_GRO_CB(p)->same_flow = 0;
1352 continue;
1353 }
1354
1355 /* All fields must match except length and checksum. */
1356 NAPI_GRO_CB(p)->flush |=
1357 (iph->ttl ^ iph2->ttl) |
1358 (iph->tos ^ iph2->tos) |
1359 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1360
1361 NAPI_GRO_CB(p)->flush |= flush;
1362
1363 /* We need to store of the IP ID check to be included later
1364 * when we can verify that this packet does in fact belong
1365 * to a given flow.
1366 */
1367 flush_id = (u16)(id - ntohs(iph2->id));
1368
1369 /* This bit of code makes it much easier for us to identify
1370 * the cases where we are doing atomic vs non-atomic IP ID
1371 * checks. Specifically an atomic check can return IP ID
1372 * values 0 - 0xFFFF, while a non-atomic check can only
1373 * return 0 or 0xFFFF.
1374 */
1375 if (!NAPI_GRO_CB(p)->is_atomic ||
1376 !(iph->frag_off & htons(IP_DF))) {
1377 flush_id ^= NAPI_GRO_CB(p)->count;
1378 flush_id = flush_id ? 0xFFFF : 0;
1379 }
1380
1381 /* If the previous IP ID value was based on an atomic
1382 * datagram we can overwrite the value and ignore it.
1383 */
1384 if (NAPI_GRO_CB(skb)->is_atomic)
1385 NAPI_GRO_CB(p)->flush_id = flush_id;
1386 else
1387 NAPI_GRO_CB(p)->flush_id |= flush_id;
1388 }
1389
1390 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1391 NAPI_GRO_CB(skb)->flush |= flush;
1392 skb_set_network_header(skb, off);
1393 /* The above will be needed by the transport layer if there is one
1394 * immediately following this IP hdr.
1395 */
1396
1397 /* Note : No need to call skb_gro_postpull_rcsum() here,
1398 * as we already checked checksum over ipv4 header was 0
1399 */
1400 skb_gro_pull(skb, sizeof(*iph));
1401 skb_set_transport_header(skb, skb_gro_offset(skb));
1402
1403 pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
1404
1405out_unlock:
1406 rcu_read_unlock();
1407
1408out:
1409 NAPI_GRO_CB(skb)->flush |= flush;
1410
1411 return pp;
1412}
1413EXPORT_SYMBOL(inet_gro_receive);
1414
1415static struct sk_buff **ipip_gro_receive(struct sk_buff **head,
1416 struct sk_buff *skb)
1417{
1418 if (NAPI_GRO_CB(skb)->encap_mark) {
1419 NAPI_GRO_CB(skb)->flush = 1;
1420 return NULL;
1421 }
1422
1423 NAPI_GRO_CB(skb)->encap_mark = 1;
1424
1425 return inet_gro_receive(head, skb);
1426}
1427
1428#define SECONDS_PER_DAY 86400
1429
1430/* inet_current_timestamp - Return IP network timestamp
1431 *
1432 * Return milliseconds since midnight in network byte order.
1433 */
1434__be32 inet_current_timestamp(void)
1435{
1436 u32 secs;
1437 u32 msecs;
1438 struct timespec64 ts;
1439
1440 ktime_get_real_ts64(&ts);
1441
1442 /* Get secs since midnight. */
1443 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1444 /* Convert to msecs. */
1445 msecs = secs * MSEC_PER_SEC;
1446 /* Convert nsec to msec. */
1447 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1448
1449 /* Convert to network byte order. */
1450 return htonl(msecs);
1451}
1452EXPORT_SYMBOL(inet_current_timestamp);
1453
1454int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1455{
1456 if (sk->sk_family == AF_INET)
1457 return ip_recv_error(sk, msg, len, addr_len);
1458#if IS_ENABLED(CONFIG_IPV6)
1459 if (sk->sk_family == AF_INET6)
1460 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1461#endif
1462 return -EINVAL;
1463}
1464
1465int inet_gro_complete(struct sk_buff *skb, int nhoff)
1466{
1467 __be16 newlen = htons(skb->len - nhoff);
1468 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1469 const struct net_offload *ops;
1470 int proto = iph->protocol;
1471 int err = -ENOSYS;
1472
1473 if (skb->encapsulation) {
1474 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1475 skb_set_inner_network_header(skb, nhoff);
1476 }
1477
1478 csum_replace2(&iph->check, iph->tot_len, newlen);
1479 iph->tot_len = newlen;
1480
1481 rcu_read_lock();
1482 ops = rcu_dereference(inet_offloads[proto]);
1483 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1484 goto out_unlock;
1485
1486 /* Only need to add sizeof(*iph) to get to the next hdr below
1487 * because any hdr with option will have been flushed in
1488 * inet_gro_receive().
1489 */
1490 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1491
1492out_unlock:
1493 rcu_read_unlock();
1494
1495 return err;
1496}
1497EXPORT_SYMBOL(inet_gro_complete);
1498
1499static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1500{
1501 skb->encapsulation = 1;
1502 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1503 return inet_gro_complete(skb, nhoff);
1504}
1505
1506int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1507 unsigned short type, unsigned char protocol,
1508 struct net *net)
1509{
1510 struct socket *sock;
1511 int rc = sock_create_kern(net, family, type, protocol, &sock);
1512
1513 if (rc == 0) {
1514 *sk = sock->sk;
1515 (*sk)->sk_allocation = GFP_ATOMIC;
1516 /*
1517 * Unhash it so that IP input processing does not even see it,
1518 * we do not wish this socket to see incoming packets.
1519 */
1520 (*sk)->sk_prot->unhash(*sk);
1521 }
1522 return rc;
1523}
1524EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1525
1526u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1527{
1528 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1529}
1530EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1531
1532unsigned long snmp_fold_field(void __percpu *mib, int offt)
1533{
1534 unsigned long res = 0;
1535 int i;
1536
1537 for_each_possible_cpu(i)
1538 res += snmp_get_cpu_field(mib, i, offt);
1539 return res;
1540}
1541EXPORT_SYMBOL_GPL(snmp_fold_field);
1542
1543#if BITS_PER_LONG==32
1544
1545u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1546 size_t syncp_offset)
1547{
1548 void *bhptr;
1549 struct u64_stats_sync *syncp;
1550 u64 v;
1551 unsigned int start;
1552
1553 bhptr = per_cpu_ptr(mib, cpu);
1554 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1555 do {
1556 start = u64_stats_fetch_begin_irq(syncp);
1557 v = *(((u64 *)bhptr) + offt);
1558 } while (u64_stats_fetch_retry_irq(syncp, start));
1559
1560 return v;
1561}
1562EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1563
1564u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1565{
1566 u64 res = 0;
1567 int cpu;
1568
1569 for_each_possible_cpu(cpu) {
1570 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1571 }
1572 return res;
1573}
1574EXPORT_SYMBOL_GPL(snmp_fold_field64);
1575#endif
1576
1577#ifdef CONFIG_IP_MULTICAST
1578static const struct net_protocol igmp_protocol = {
1579 .handler = igmp_rcv,
1580 .netns_ok = 1,
1581};
1582#endif
1583
1584static const struct net_protocol tcp_protocol = {
1585 .early_demux = tcp_v4_early_demux,
1586 .handler = tcp_v4_rcv,
1587 .err_handler = tcp_v4_err,
1588 .no_policy = 1,
1589 .netns_ok = 1,
1590 .icmp_strict_tag_validation = 1,
1591};
1592
1593static const struct net_protocol udp_protocol = {
1594 .early_demux = udp_v4_early_demux,
1595 .handler = udp_rcv,
1596 .err_handler = udp_err,
1597 .no_policy = 1,
1598 .netns_ok = 1,
1599};
1600
1601static const struct net_protocol icmp_protocol = {
1602 .handler = icmp_rcv,
1603 .err_handler = icmp_err,
1604 .no_policy = 1,
1605 .netns_ok = 1,
1606};
1607
1608static __net_init int ipv4_mib_init_net(struct net *net)
1609{
1610 int i;
1611
1612 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1613 if (!net->mib.tcp_statistics)
1614 goto err_tcp_mib;
1615 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1616 if (!net->mib.ip_statistics)
1617 goto err_ip_mib;
1618
1619 for_each_possible_cpu(i) {
1620 struct ipstats_mib *af_inet_stats;
1621 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1622 u64_stats_init(&af_inet_stats->syncp);
1623 }
1624
1625 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1626 if (!net->mib.net_statistics)
1627 goto err_net_mib;
1628 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1629 if (!net->mib.udp_statistics)
1630 goto err_udp_mib;
1631 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1632 if (!net->mib.udplite_statistics)
1633 goto err_udplite_mib;
1634 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1635 if (!net->mib.icmp_statistics)
1636 goto err_icmp_mib;
1637 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1638 GFP_KERNEL);
1639 if (!net->mib.icmpmsg_statistics)
1640 goto err_icmpmsg_mib;
1641
1642 tcp_mib_init(net);
1643 return 0;
1644
1645err_icmpmsg_mib:
1646 free_percpu(net->mib.icmp_statistics);
1647err_icmp_mib:
1648 free_percpu(net->mib.udplite_statistics);
1649err_udplite_mib:
1650 free_percpu(net->mib.udp_statistics);
1651err_udp_mib:
1652 free_percpu(net->mib.net_statistics);
1653err_net_mib:
1654 free_percpu(net->mib.ip_statistics);
1655err_ip_mib:
1656 free_percpu(net->mib.tcp_statistics);
1657err_tcp_mib:
1658 return -ENOMEM;
1659}
1660
1661static __net_exit void ipv4_mib_exit_net(struct net *net)
1662{
1663 kfree(net->mib.icmpmsg_statistics);
1664 free_percpu(net->mib.icmp_statistics);
1665 free_percpu(net->mib.udplite_statistics);
1666 free_percpu(net->mib.udp_statistics);
1667 free_percpu(net->mib.net_statistics);
1668 free_percpu(net->mib.ip_statistics);
1669 free_percpu(net->mib.tcp_statistics);
1670}
1671
1672static __net_initdata struct pernet_operations ipv4_mib_ops = {
1673 .init = ipv4_mib_init_net,
1674 .exit = ipv4_mib_exit_net,
1675};
1676
1677static int __init init_ipv4_mibs(void)
1678{
1679 return register_pernet_subsys(&ipv4_mib_ops);
1680}
1681
1682static __net_init int inet_init_net(struct net *net)
1683{
1684 /*
1685 * Set defaults for local port range
1686 */
1687 seqlock_init(&net->ipv4.ip_local_ports.lock);
1688 net->ipv4.ip_local_ports.range[0] = 32768;
1689 net->ipv4.ip_local_ports.range[1] = 60999;
1690
1691 seqlock_init(&net->ipv4.ping_group_range.lock);
1692 /*
1693 * Sane defaults - nobody may create ping sockets.
1694 * Boot scripts should set this to distro-specific group.
1695 */
1696 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1697 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1698
1699 /* Default values for sysctl-controlled parameters.
1700 * We set them here, in case sysctl is not compiled.
1701 */
1702 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1703 net->ipv4.sysctl_ip_dynaddr = 0;
1704 net->ipv4.sysctl_ip_early_demux = 1;
1705
1706 return 0;
1707}
1708
1709static __net_exit void inet_exit_net(struct net *net)
1710{
1711}
1712
1713static __net_initdata struct pernet_operations af_inet_ops = {
1714 .init = inet_init_net,
1715 .exit = inet_exit_net,
1716};
1717
1718static int __init init_inet_pernet_ops(void)
1719{
1720 return register_pernet_subsys(&af_inet_ops);
1721}
1722
1723static int ipv4_proc_init(void);
1724
1725/*
1726 * IP protocol layer initialiser
1727 */
1728
1729static struct packet_offload ip_packet_offload __read_mostly = {
1730 .type = cpu_to_be16(ETH_P_IP),
1731 .callbacks = {
1732 .gso_segment = inet_gso_segment,
1733 .gro_receive = inet_gro_receive,
1734 .gro_complete = inet_gro_complete,
1735 },
1736};
1737
1738static const struct net_offload ipip_offload = {
1739 .callbacks = {
1740 .gso_segment = inet_gso_segment,
1741 .gro_receive = ipip_gro_receive,
1742 .gro_complete = ipip_gro_complete,
1743 },
1744};
1745
1746static int __init ipv4_offload_init(void)
1747{
1748 /*
1749 * Add offloads
1750 */
1751 if (udpv4_offload_init() < 0)
1752 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1753 if (tcpv4_offload_init() < 0)
1754 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1755
1756 dev_add_offload(&ip_packet_offload);
1757 inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1758 return 0;
1759}
1760
1761fs_initcall(ipv4_offload_init);
1762
1763static struct packet_type ip_packet_type __read_mostly = {
1764 .type = cpu_to_be16(ETH_P_IP),
1765 .func = ip_rcv,
1766};
1767
1768static int __init inet_init(void)
1769{
1770 struct inet_protosw *q;
1771 struct list_head *r;
1772 int rc = -EINVAL;
1773
1774 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1775
1776 rc = proto_register(&tcp_prot, 1);
1777 if (rc)
1778 goto out;
1779
1780 rc = proto_register(&udp_prot, 1);
1781 if (rc)
1782 goto out_unregister_tcp_proto;
1783
1784 rc = proto_register(&raw_prot, 1);
1785 if (rc)
1786 goto out_unregister_udp_proto;
1787
1788 rc = proto_register(&ping_prot, 1);
1789 if (rc)
1790 goto out_unregister_raw_proto;
1791
1792 /*
1793 * Tell SOCKET that we are alive...
1794 */
1795
1796 (void)sock_register(&inet_family_ops);
1797
1798#ifdef CONFIG_SYSCTL
1799 ip_static_sysctl_init();
1800#endif
1801
1802 /*
1803 * Add all the base protocols.
1804 */
1805
1806 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1807 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1808 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1809 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1810 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1811 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1812#ifdef CONFIG_IP_MULTICAST
1813 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1814 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1815#endif
1816
1817 /* Register the socket-side information for inet_create. */
1818 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1819 INIT_LIST_HEAD(r);
1820
1821 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1822 inet_register_protosw(q);
1823
1824 /*
1825 * Set the ARP module up
1826 */
1827
1828 arp_init();
1829
1830 /*
1831 * Set the IP module up
1832 */
1833
1834 ip_init();
1835
1836 tcp_v4_init();
1837
1838 /* Setup TCP slab cache for open requests. */
1839 tcp_init();
1840
1841 /* Setup UDP memory threshold */
1842 udp_init();
1843
1844 /* Add UDP-Lite (RFC 3828) */
1845 udplite4_register();
1846
1847 ping_init();
1848
1849 /*
1850 * Set the ICMP layer up
1851 */
1852
1853 if (icmp_init() < 0)
1854 panic("Failed to create the ICMP control socket.\n");
1855
1856 /*
1857 * Initialise the multicast router
1858 */
1859#if defined(CONFIG_IP_MROUTE)
1860 if (ip_mr_init())
1861 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1862#endif
1863
1864 if (init_inet_pernet_ops())
1865 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
1866 /*
1867 * Initialise per-cpu ipv4 mibs
1868 */
1869
1870 if (init_ipv4_mibs())
1871 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1872
1873 ipv4_proc_init();
1874
1875 ipfrag_init();
1876
1877 dev_add_pack(&ip_packet_type);
1878
1879 ip_tunnel_core_init();
1880
1881 rc = 0;
1882out:
1883 return rc;
1884out_unregister_raw_proto:
1885 proto_unregister(&raw_prot);
1886out_unregister_udp_proto:
1887 proto_unregister(&udp_prot);
1888out_unregister_tcp_proto:
1889 proto_unregister(&tcp_prot);
1890 goto out;
1891}
1892
1893fs_initcall(inet_init);
1894
1895/* ------------------------------------------------------------------------ */
1896
1897#ifdef CONFIG_PROC_FS
1898static int __init ipv4_proc_init(void)
1899{
1900 int rc = 0;
1901
1902 if (raw_proc_init())
1903 goto out_raw;
1904 if (tcp4_proc_init())
1905 goto out_tcp;
1906 if (udp4_proc_init())
1907 goto out_udp;
1908 if (ping_proc_init())
1909 goto out_ping;
1910 if (ip_misc_proc_init())
1911 goto out_misc;
1912out:
1913 return rc;
1914out_misc:
1915 ping_proc_exit();
1916out_ping:
1917 udp4_proc_exit();
1918out_udp:
1919 tcp4_proc_exit();
1920out_tcp:
1921 raw_proc_exit();
1922out_raw:
1923 rc = -ENOMEM;
1924 goto out;
1925}
1926
1927#else /* CONFIG_PROC_FS */
1928static int __init ipv4_proc_init(void)
1929{
1930 return 0;
1931}
1932#endif /* CONFIG_PROC_FS */