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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * PF_INET protocol family socket handler.
8 *
9 * Authors: Ross Biro
10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 * Florian La Roche, <flla@stud.uni-sb.de>
12 * Alan Cox, <A.Cox@swansea.ac.uk>
13 *
14 * Changes (see also sock.c)
15 *
16 * piggy,
17 * Karl Knutson : Socket protocol table
18 * A.N.Kuznetsov : Socket death error in accept().
19 * John Richardson : Fix non blocking error in connect()
20 * so sockets that fail to connect
21 * don't return -EINPROGRESS.
22 * Alan Cox : Asynchronous I/O support
23 * Alan Cox : Keep correct socket pointer on sock
24 * structures
25 * when accept() ed
26 * Alan Cox : Semantics of SO_LINGER aren't state
27 * moved to close when you look carefully.
28 * With this fixed and the accept bug fixed
29 * some RPC stuff seems happier.
30 * Niibe Yutaka : 4.4BSD style write async I/O
31 * Alan Cox,
32 * Tony Gale : Fixed reuse semantics.
33 * Alan Cox : bind() shouldn't abort existing but dead
34 * sockets. Stops FTP netin:.. I hope.
35 * Alan Cox : bind() works correctly for RAW sockets.
36 * Note that FreeBSD at least was broken
37 * in this respect so be careful with
38 * compatibility tests...
39 * Alan Cox : routing cache support
40 * Alan Cox : memzero the socket structure for
41 * compactness.
42 * Matt Day : nonblock connect error handler
43 * Alan Cox : Allow large numbers of pending sockets
44 * (eg for big web sites), but only if
45 * specifically application requested.
46 * Alan Cox : New buffering throughout IP. Used
47 * dumbly.
48 * Alan Cox : New buffering now used smartly.
49 * Alan Cox : BSD rather than common sense
50 * interpretation of listen.
51 * Germano Caronni : Assorted small races.
52 * Alan Cox : sendmsg/recvmsg basic support.
53 * Alan Cox : Only sendmsg/recvmsg now supported.
54 * Alan Cox : Locked down bind (see security list).
55 * Alan Cox : Loosened bind a little.
56 * Mike McLagan : ADD/DEL DLCI Ioctls
57 * Willy Konynenberg : Transparent proxying support.
58 * David S. Miller : New socket lookup architecture.
59 * Some other random speedups.
60 * Cyrus Durgin : Cleaned up file for kmod hacks.
61 * Andi Kleen : Fix inet_stream_connect TCP race.
62 */
63
64#define pr_fmt(fmt) "IPv4: " fmt
65
66#include <linux/err.h>
67#include <linux/errno.h>
68#include <linux/types.h>
69#include <linux/socket.h>
70#include <linux/in.h>
71#include <linux/kernel.h>
72#include <linux/kmod.h>
73#include <linux/sched.h>
74#include <linux/timer.h>
75#include <linux/string.h>
76#include <linux/sockios.h>
77#include <linux/net.h>
78#include <linux/capability.h>
79#include <linux/fcntl.h>
80#include <linux/mm.h>
81#include <linux/interrupt.h>
82#include <linux/stat.h>
83#include <linux/init.h>
84#include <linux/poll.h>
85#include <linux/netfilter_ipv4.h>
86#include <linux/random.h>
87#include <linux/slab.h>
88
89#include <linux/uaccess.h>
90
91#include <linux/inet.h>
92#include <linux/igmp.h>
93#include <linux/inetdevice.h>
94#include <linux/netdevice.h>
95#include <net/checksum.h>
96#include <net/ip.h>
97#include <net/protocol.h>
98#include <net/arp.h>
99#include <net/route.h>
100#include <net/ip_fib.h>
101#include <net/inet_connection_sock.h>
102#include <net/tcp.h>
103#include <net/udp.h>
104#include <net/udplite.h>
105#include <net/ping.h>
106#include <linux/skbuff.h>
107#include <net/sock.h>
108#include <net/raw.h>
109#include <net/icmp.h>
110#include <net/inet_common.h>
111#include <net/ip_tunnels.h>
112#include <net/xfrm.h>
113#include <net/net_namespace.h>
114#include <net/secure_seq.h>
115#ifdef CONFIG_IP_MROUTE
116#include <linux/mroute.h>
117#endif
118#include <net/l3mdev.h>
119
120#include <trace/events/sock.h>
121
122/* The inetsw table contains everything that inet_create needs to
123 * build a new socket.
124 */
125static struct list_head inetsw[SOCK_MAX];
126static DEFINE_SPINLOCK(inetsw_lock);
127
128/* New destruction routine */
129
130void inet_sock_destruct(struct sock *sk)
131{
132 struct inet_sock *inet = inet_sk(sk);
133
134 __skb_queue_purge(&sk->sk_receive_queue);
135 if (sk->sk_rx_skb_cache) {
136 __kfree_skb(sk->sk_rx_skb_cache);
137 sk->sk_rx_skb_cache = NULL;
138 }
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_protected(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 sk->sk_max_ack_backlog = backlog;
212 /* Really, if the socket is already in listen state
213 * we can only allow the backlog to be adjusted.
214 */
215 if (old_state != TCP_LISTEN) {
216 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
217 * Note that only TCP sockets (SOCK_STREAM) will reach here.
218 * Also fastopen backlog may already been set via the option
219 * because the socket was in TCP_LISTEN state previously but
220 * was shutdown() rather than close().
221 */
222 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen;
223 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
224 (tcp_fastopen & TFO_SERVER_ENABLE) &&
225 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
226 fastopen_queue_tune(sk, backlog);
227 tcp_fastopen_init_key_once(sock_net(sk));
228 }
229
230 err = inet_csk_listen_start(sk, backlog);
231 if (err)
232 goto out;
233 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
234 }
235 err = 0;
236
237out:
238 release_sock(sk);
239 return err;
240}
241EXPORT_SYMBOL(inet_listen);
242
243/*
244 * Create an inet socket.
245 */
246
247static int inet_create(struct net *net, struct socket *sock, int protocol,
248 int kern)
249{
250 struct sock *sk;
251 struct inet_protosw *answer;
252 struct inet_sock *inet;
253 struct proto *answer_prot;
254 unsigned char answer_flags;
255 int try_loading_module = 0;
256 int err;
257
258 if (protocol < 0 || protocol >= IPPROTO_MAX)
259 return -EINVAL;
260
261 sock->state = SS_UNCONNECTED;
262
263 /* Look for the requested type/protocol pair. */
264lookup_protocol:
265 err = -ESOCKTNOSUPPORT;
266 rcu_read_lock();
267 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
268
269 err = 0;
270 /* Check the non-wild match. */
271 if (protocol == answer->protocol) {
272 if (protocol != IPPROTO_IP)
273 break;
274 } else {
275 /* Check for the two wild cases. */
276 if (IPPROTO_IP == protocol) {
277 protocol = answer->protocol;
278 break;
279 }
280 if (IPPROTO_IP == answer->protocol)
281 break;
282 }
283 err = -EPROTONOSUPPORT;
284 }
285
286 if (unlikely(err)) {
287 if (try_loading_module < 2) {
288 rcu_read_unlock();
289 /*
290 * Be more specific, e.g. net-pf-2-proto-132-type-1
291 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
292 */
293 if (++try_loading_module == 1)
294 request_module("net-pf-%d-proto-%d-type-%d",
295 PF_INET, protocol, sock->type);
296 /*
297 * Fall back to generic, e.g. net-pf-2-proto-132
298 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
299 */
300 else
301 request_module("net-pf-%d-proto-%d",
302 PF_INET, protocol);
303 goto lookup_protocol;
304 } else
305 goto out_rcu_unlock;
306 }
307
308 err = -EPERM;
309 if (sock->type == SOCK_RAW && !kern &&
310 !ns_capable(net->user_ns, CAP_NET_RAW))
311 goto out_rcu_unlock;
312
313 sock->ops = answer->ops;
314 answer_prot = answer->prot;
315 answer_flags = answer->flags;
316 rcu_read_unlock();
317
318 WARN_ON(!answer_prot->slab);
319
320 err = -ENOBUFS;
321 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
322 if (!sk)
323 goto out;
324
325 err = 0;
326 if (INET_PROTOSW_REUSE & answer_flags)
327 sk->sk_reuse = SK_CAN_REUSE;
328
329 inet = inet_sk(sk);
330 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
331
332 inet->nodefrag = 0;
333
334 if (SOCK_RAW == sock->type) {
335 inet->inet_num = protocol;
336 if (IPPROTO_RAW == protocol)
337 inet->hdrincl = 1;
338 }
339
340 if (net->ipv4.sysctl_ip_no_pmtu_disc)
341 inet->pmtudisc = IP_PMTUDISC_DONT;
342 else
343 inet->pmtudisc = IP_PMTUDISC_WANT;
344
345 inet->inet_id = 0;
346
347 sock_init_data(sock, sk);
348
349 sk->sk_destruct = inet_sock_destruct;
350 sk->sk_protocol = protocol;
351 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
352
353 inet->uc_ttl = -1;
354 inet->mc_loop = 1;
355 inet->mc_ttl = 1;
356 inet->mc_all = 1;
357 inet->mc_index = 0;
358 inet->mc_list = NULL;
359 inet->rcv_tos = 0;
360
361 sk_refcnt_debug_inc(sk);
362
363 if (inet->inet_num) {
364 /* It assumes that any protocol which allows
365 * the user to assign a number at socket
366 * creation time automatically
367 * shares.
368 */
369 inet->inet_sport = htons(inet->inet_num);
370 /* Add to protocol hash chains. */
371 err = sk->sk_prot->hash(sk);
372 if (err) {
373 sk_common_release(sk);
374 goto out;
375 }
376 }
377
378 if (sk->sk_prot->init) {
379 err = sk->sk_prot->init(sk);
380 if (err) {
381 sk_common_release(sk);
382 goto out;
383 }
384 }
385
386 if (!kern) {
387 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
388 if (err) {
389 sk_common_release(sk);
390 goto out;
391 }
392 }
393out:
394 return err;
395out_rcu_unlock:
396 rcu_read_unlock();
397 goto out;
398}
399
400
401/*
402 * The peer socket should always be NULL (or else). When we call this
403 * function we are destroying the object and from then on nobody
404 * should refer to it.
405 */
406int inet_release(struct socket *sock)
407{
408 struct sock *sk = sock->sk;
409
410 if (sk) {
411 long timeout;
412
413 /* Applications forget to leave groups before exiting */
414 ip_mc_drop_socket(sk);
415
416 /* If linger is set, we don't return until the close
417 * is complete. Otherwise we return immediately. The
418 * actually closing is done the same either way.
419 *
420 * If the close is due to the process exiting, we never
421 * linger..
422 */
423 timeout = 0;
424 if (sock_flag(sk, SOCK_LINGER) &&
425 !(current->flags & PF_EXITING))
426 timeout = sk->sk_lingertime;
427 sk->sk_prot->close(sk, timeout);
428 sock->sk = NULL;
429 }
430 return 0;
431}
432EXPORT_SYMBOL(inet_release);
433
434int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
435{
436 struct sock *sk = sock->sk;
437 int err;
438
439 /* If the socket has its own bind function then use it. (RAW) */
440 if (sk->sk_prot->bind) {
441 return sk->sk_prot->bind(sk, uaddr, addr_len);
442 }
443 if (addr_len < sizeof(struct sockaddr_in))
444 return -EINVAL;
445
446 /* BPF prog is run before any checks are done so that if the prog
447 * changes context in a wrong way it will be caught.
448 */
449 err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr);
450 if (err)
451 return err;
452
453 return __inet_bind(sk, uaddr, addr_len, false, true);
454}
455EXPORT_SYMBOL(inet_bind);
456
457int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
458 bool force_bind_address_no_port, bool with_lock)
459{
460 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
461 struct inet_sock *inet = inet_sk(sk);
462 struct net *net = sock_net(sk);
463 unsigned short snum;
464 int chk_addr_ret;
465 u32 tb_id = RT_TABLE_LOCAL;
466 int err;
467
468 if (addr->sin_family != AF_INET) {
469 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
470 * only if s_addr is INADDR_ANY.
471 */
472 err = -EAFNOSUPPORT;
473 if (addr->sin_family != AF_UNSPEC ||
474 addr->sin_addr.s_addr != htonl(INADDR_ANY))
475 goto out;
476 }
477
478 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
479 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
480
481 /* Not specified by any standard per-se, however it breaks too
482 * many applications when removed. It is unfortunate since
483 * allowing applications to make a non-local bind solves
484 * several problems with systems using dynamic addressing.
485 * (ie. your servers still start up even if your ISDN link
486 * is temporarily down)
487 */
488 err = -EADDRNOTAVAIL;
489 if (!inet_can_nonlocal_bind(net, inet) &&
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_send_prepare(struct sock *sk)
788{
789 sock_rps_record_flow(sk);
790
791 /* We may need to bind the socket. */
792 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
793 inet_autobind(sk))
794 return -EAGAIN;
795
796 return 0;
797}
798EXPORT_SYMBOL_GPL(inet_send_prepare);
799
800int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
801{
802 struct sock *sk = sock->sk;
803
804 if (unlikely(inet_send_prepare(sk)))
805 return -EAGAIN;
806
807 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
808 sk, msg, size);
809}
810EXPORT_SYMBOL(inet_sendmsg);
811
812ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
813 size_t size, int flags)
814{
815 struct sock *sk = sock->sk;
816
817 if (unlikely(inet_send_prepare(sk)))
818 return -EAGAIN;
819
820 if (sk->sk_prot->sendpage)
821 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
822 return sock_no_sendpage(sock, page, offset, size, flags);
823}
824EXPORT_SYMBOL(inet_sendpage);
825
826INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
827 size_t, int, int, int *));
828int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
829 int flags)
830{
831 struct sock *sk = sock->sk;
832 int addr_len = 0;
833 int err;
834
835 if (likely(!(flags & MSG_ERRQUEUE)))
836 sock_rps_record_flow(sk);
837
838 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
839 sk, msg, size, flags & MSG_DONTWAIT,
840 flags & ~MSG_DONTWAIT, &addr_len);
841 if (err >= 0)
842 msg->msg_namelen = addr_len;
843 return err;
844}
845EXPORT_SYMBOL(inet_recvmsg);
846
847int inet_shutdown(struct socket *sock, int how)
848{
849 struct sock *sk = sock->sk;
850 int err = 0;
851
852 /* This should really check to make sure
853 * the socket is a TCP socket. (WHY AC...)
854 */
855 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
856 1->2 bit 2 snds.
857 2->3 */
858 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
859 return -EINVAL;
860
861 lock_sock(sk);
862 if (sock->state == SS_CONNECTING) {
863 if ((1 << sk->sk_state) &
864 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
865 sock->state = SS_DISCONNECTING;
866 else
867 sock->state = SS_CONNECTED;
868 }
869
870 switch (sk->sk_state) {
871 case TCP_CLOSE:
872 err = -ENOTCONN;
873 /* Hack to wake up other listeners, who can poll for
874 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
875 /* fall through */
876 default:
877 sk->sk_shutdown |= how;
878 if (sk->sk_prot->shutdown)
879 sk->sk_prot->shutdown(sk, how);
880 break;
881
882 /* Remaining two branches are temporary solution for missing
883 * close() in multithreaded environment. It is _not_ a good idea,
884 * but we have no choice until close() is repaired at VFS level.
885 */
886 case TCP_LISTEN:
887 if (!(how & RCV_SHUTDOWN))
888 break;
889 /* fall through */
890 case TCP_SYN_SENT:
891 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
892 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
893 break;
894 }
895
896 /* Wake up anyone sleeping in poll. */
897 sk->sk_state_change(sk);
898 release_sock(sk);
899 return err;
900}
901EXPORT_SYMBOL(inet_shutdown);
902
903/*
904 * ioctl() calls you can issue on an INET socket. Most of these are
905 * device configuration and stuff and very rarely used. Some ioctls
906 * pass on to the socket itself.
907 *
908 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
909 * loads the devconfigure module does its configuring and unloads it.
910 * There's a good 20K of config code hanging around the kernel.
911 */
912
913int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
914{
915 struct sock *sk = sock->sk;
916 int err = 0;
917 struct net *net = sock_net(sk);
918 void __user *p = (void __user *)arg;
919 struct ifreq ifr;
920 struct rtentry rt;
921
922 switch (cmd) {
923 case SIOCADDRT:
924 case SIOCDELRT:
925 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
926 return -EFAULT;
927 err = ip_rt_ioctl(net, cmd, &rt);
928 break;
929 case SIOCRTMSG:
930 err = -EINVAL;
931 break;
932 case SIOCDARP:
933 case SIOCGARP:
934 case SIOCSARP:
935 err = arp_ioctl(net, cmd, (void __user *)arg);
936 break;
937 case SIOCGIFADDR:
938 case SIOCGIFBRDADDR:
939 case SIOCGIFNETMASK:
940 case SIOCGIFDSTADDR:
941 case SIOCGIFPFLAGS:
942 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
943 return -EFAULT;
944 err = devinet_ioctl(net, cmd, &ifr);
945 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
946 err = -EFAULT;
947 break;
948
949 case SIOCSIFADDR:
950 case SIOCSIFBRDADDR:
951 case SIOCSIFNETMASK:
952 case SIOCSIFDSTADDR:
953 case SIOCSIFPFLAGS:
954 case SIOCSIFFLAGS:
955 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
956 return -EFAULT;
957 err = devinet_ioctl(net, cmd, &ifr);
958 break;
959 default:
960 if (sk->sk_prot->ioctl)
961 err = sk->sk_prot->ioctl(sk, cmd, arg);
962 else
963 err = -ENOIOCTLCMD;
964 break;
965 }
966 return err;
967}
968EXPORT_SYMBOL(inet_ioctl);
969
970#ifdef CONFIG_COMPAT
971static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
972{
973 struct sock *sk = sock->sk;
974 int err = -ENOIOCTLCMD;
975
976 if (sk->sk_prot->compat_ioctl)
977 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
978
979 return err;
980}
981#endif
982
983const struct proto_ops inet_stream_ops = {
984 .family = PF_INET,
985 .owner = THIS_MODULE,
986 .release = inet_release,
987 .bind = inet_bind,
988 .connect = inet_stream_connect,
989 .socketpair = sock_no_socketpair,
990 .accept = inet_accept,
991 .getname = inet_getname,
992 .poll = tcp_poll,
993 .ioctl = inet_ioctl,
994 .gettstamp = sock_gettstamp,
995 .listen = inet_listen,
996 .shutdown = inet_shutdown,
997 .setsockopt = sock_common_setsockopt,
998 .getsockopt = sock_common_getsockopt,
999 .sendmsg = inet_sendmsg,
1000 .recvmsg = inet_recvmsg,
1001#ifdef CONFIG_MMU
1002 .mmap = tcp_mmap,
1003#endif
1004 .sendpage = inet_sendpage,
1005 .splice_read = tcp_splice_read,
1006 .read_sock = tcp_read_sock,
1007 .sendmsg_locked = tcp_sendmsg_locked,
1008 .sendpage_locked = tcp_sendpage_locked,
1009 .peek_len = tcp_peek_len,
1010#ifdef CONFIG_COMPAT
1011 .compat_setsockopt = compat_sock_common_setsockopt,
1012 .compat_getsockopt = compat_sock_common_getsockopt,
1013 .compat_ioctl = inet_compat_ioctl,
1014#endif
1015 .set_rcvlowat = tcp_set_rcvlowat,
1016};
1017EXPORT_SYMBOL(inet_stream_ops);
1018
1019const struct proto_ops inet_dgram_ops = {
1020 .family = PF_INET,
1021 .owner = THIS_MODULE,
1022 .release = inet_release,
1023 .bind = inet_bind,
1024 .connect = inet_dgram_connect,
1025 .socketpair = sock_no_socketpair,
1026 .accept = sock_no_accept,
1027 .getname = inet_getname,
1028 .poll = udp_poll,
1029 .ioctl = inet_ioctl,
1030 .gettstamp = sock_gettstamp,
1031 .listen = sock_no_listen,
1032 .shutdown = inet_shutdown,
1033 .setsockopt = sock_common_setsockopt,
1034 .getsockopt = sock_common_getsockopt,
1035 .sendmsg = inet_sendmsg,
1036 .recvmsg = inet_recvmsg,
1037 .mmap = sock_no_mmap,
1038 .sendpage = inet_sendpage,
1039 .set_peek_off = sk_set_peek_off,
1040#ifdef CONFIG_COMPAT
1041 .compat_setsockopt = compat_sock_common_setsockopt,
1042 .compat_getsockopt = compat_sock_common_getsockopt,
1043 .compat_ioctl = inet_compat_ioctl,
1044#endif
1045};
1046EXPORT_SYMBOL(inet_dgram_ops);
1047
1048/*
1049 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1050 * udp_poll
1051 */
1052static const struct proto_ops inet_sockraw_ops = {
1053 .family = PF_INET,
1054 .owner = THIS_MODULE,
1055 .release = inet_release,
1056 .bind = inet_bind,
1057 .connect = inet_dgram_connect,
1058 .socketpair = sock_no_socketpair,
1059 .accept = sock_no_accept,
1060 .getname = inet_getname,
1061 .poll = datagram_poll,
1062 .ioctl = inet_ioctl,
1063 .gettstamp = sock_gettstamp,
1064 .listen = sock_no_listen,
1065 .shutdown = inet_shutdown,
1066 .setsockopt = sock_common_setsockopt,
1067 .getsockopt = sock_common_getsockopt,
1068 .sendmsg = inet_sendmsg,
1069 .recvmsg = inet_recvmsg,
1070 .mmap = sock_no_mmap,
1071 .sendpage = inet_sendpage,
1072#ifdef CONFIG_COMPAT
1073 .compat_setsockopt = compat_sock_common_setsockopt,
1074 .compat_getsockopt = compat_sock_common_getsockopt,
1075 .compat_ioctl = inet_compat_ioctl,
1076#endif
1077};
1078
1079static const struct net_proto_family inet_family_ops = {
1080 .family = PF_INET,
1081 .create = inet_create,
1082 .owner = THIS_MODULE,
1083};
1084
1085/* Upon startup we insert all the elements in inetsw_array[] into
1086 * the linked list inetsw.
1087 */
1088static struct inet_protosw inetsw_array[] =
1089{
1090 {
1091 .type = SOCK_STREAM,
1092 .protocol = IPPROTO_TCP,
1093 .prot = &tcp_prot,
1094 .ops = &inet_stream_ops,
1095 .flags = INET_PROTOSW_PERMANENT |
1096 INET_PROTOSW_ICSK,
1097 },
1098
1099 {
1100 .type = SOCK_DGRAM,
1101 .protocol = IPPROTO_UDP,
1102 .prot = &udp_prot,
1103 .ops = &inet_dgram_ops,
1104 .flags = INET_PROTOSW_PERMANENT,
1105 },
1106
1107 {
1108 .type = SOCK_DGRAM,
1109 .protocol = IPPROTO_ICMP,
1110 .prot = &ping_prot,
1111 .ops = &inet_sockraw_ops,
1112 .flags = INET_PROTOSW_REUSE,
1113 },
1114
1115 {
1116 .type = SOCK_RAW,
1117 .protocol = IPPROTO_IP, /* wild card */
1118 .prot = &raw_prot,
1119 .ops = &inet_sockraw_ops,
1120 .flags = INET_PROTOSW_REUSE,
1121 }
1122};
1123
1124#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1125
1126void inet_register_protosw(struct inet_protosw *p)
1127{
1128 struct list_head *lh;
1129 struct inet_protosw *answer;
1130 int protocol = p->protocol;
1131 struct list_head *last_perm;
1132
1133 spin_lock_bh(&inetsw_lock);
1134
1135 if (p->type >= SOCK_MAX)
1136 goto out_illegal;
1137
1138 /* If we are trying to override a permanent protocol, bail. */
1139 last_perm = &inetsw[p->type];
1140 list_for_each(lh, &inetsw[p->type]) {
1141 answer = list_entry(lh, struct inet_protosw, list);
1142 /* Check only the non-wild match. */
1143 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1144 break;
1145 if (protocol == answer->protocol)
1146 goto out_permanent;
1147 last_perm = lh;
1148 }
1149
1150 /* Add the new entry after the last permanent entry if any, so that
1151 * the new entry does not override a permanent entry when matched with
1152 * a wild-card protocol. But it is allowed to override any existing
1153 * non-permanent entry. This means that when we remove this entry, the
1154 * system automatically returns to the old behavior.
1155 */
1156 list_add_rcu(&p->list, last_perm);
1157out:
1158 spin_unlock_bh(&inetsw_lock);
1159
1160 return;
1161
1162out_permanent:
1163 pr_err("Attempt to override permanent protocol %d\n", protocol);
1164 goto out;
1165
1166out_illegal:
1167 pr_err("Ignoring attempt to register invalid socket type %d\n",
1168 p->type);
1169 goto out;
1170}
1171EXPORT_SYMBOL(inet_register_protosw);
1172
1173void inet_unregister_protosw(struct inet_protosw *p)
1174{
1175 if (INET_PROTOSW_PERMANENT & p->flags) {
1176 pr_err("Attempt to unregister permanent protocol %d\n",
1177 p->protocol);
1178 } else {
1179 spin_lock_bh(&inetsw_lock);
1180 list_del_rcu(&p->list);
1181 spin_unlock_bh(&inetsw_lock);
1182
1183 synchronize_net();
1184 }
1185}
1186EXPORT_SYMBOL(inet_unregister_protosw);
1187
1188static int inet_sk_reselect_saddr(struct sock *sk)
1189{
1190 struct inet_sock *inet = inet_sk(sk);
1191 __be32 old_saddr = inet->inet_saddr;
1192 __be32 daddr = inet->inet_daddr;
1193 struct flowi4 *fl4;
1194 struct rtable *rt;
1195 __be32 new_saddr;
1196 struct ip_options_rcu *inet_opt;
1197
1198 inet_opt = rcu_dereference_protected(inet->inet_opt,
1199 lockdep_sock_is_held(sk));
1200 if (inet_opt && inet_opt->opt.srr)
1201 daddr = inet_opt->opt.faddr;
1202
1203 /* Query new route. */
1204 fl4 = &inet->cork.fl.u.ip4;
1205 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1206 sk->sk_bound_dev_if, sk->sk_protocol,
1207 inet->inet_sport, inet->inet_dport, sk);
1208 if (IS_ERR(rt))
1209 return PTR_ERR(rt);
1210
1211 sk_setup_caps(sk, &rt->dst);
1212
1213 new_saddr = fl4->saddr;
1214
1215 if (new_saddr == old_saddr)
1216 return 0;
1217
1218 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1219 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1220 __func__, &old_saddr, &new_saddr);
1221 }
1222
1223 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1224
1225 /*
1226 * XXX The only one ugly spot where we need to
1227 * XXX really change the sockets identity after
1228 * XXX it has entered the hashes. -DaveM
1229 *
1230 * Besides that, it does not check for connection
1231 * uniqueness. Wait for troubles.
1232 */
1233 return __sk_prot_rehash(sk);
1234}
1235
1236int inet_sk_rebuild_header(struct sock *sk)
1237{
1238 struct inet_sock *inet = inet_sk(sk);
1239 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1240 __be32 daddr;
1241 struct ip_options_rcu *inet_opt;
1242 struct flowi4 *fl4;
1243 int err;
1244
1245 /* Route is OK, nothing to do. */
1246 if (rt)
1247 return 0;
1248
1249 /* Reroute. */
1250 rcu_read_lock();
1251 inet_opt = rcu_dereference(inet->inet_opt);
1252 daddr = inet->inet_daddr;
1253 if (inet_opt && inet_opt->opt.srr)
1254 daddr = inet_opt->opt.faddr;
1255 rcu_read_unlock();
1256 fl4 = &inet->cork.fl.u.ip4;
1257 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1258 inet->inet_dport, inet->inet_sport,
1259 sk->sk_protocol, RT_CONN_FLAGS(sk),
1260 sk->sk_bound_dev_if);
1261 if (!IS_ERR(rt)) {
1262 err = 0;
1263 sk_setup_caps(sk, &rt->dst);
1264 } else {
1265 err = PTR_ERR(rt);
1266
1267 /* Routing failed... */
1268 sk->sk_route_caps = 0;
1269 /*
1270 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1271 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1272 */
1273 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1274 sk->sk_state != TCP_SYN_SENT ||
1275 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1276 (err = inet_sk_reselect_saddr(sk)) != 0)
1277 sk->sk_err_soft = -err;
1278 }
1279
1280 return err;
1281}
1282EXPORT_SYMBOL(inet_sk_rebuild_header);
1283
1284void inet_sk_set_state(struct sock *sk, int state)
1285{
1286 trace_inet_sock_set_state(sk, sk->sk_state, state);
1287 sk->sk_state = state;
1288}
1289EXPORT_SYMBOL(inet_sk_set_state);
1290
1291void inet_sk_state_store(struct sock *sk, int newstate)
1292{
1293 trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1294 smp_store_release(&sk->sk_state, newstate);
1295}
1296
1297struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1298 netdev_features_t features)
1299{
1300 bool udpfrag = false, fixedid = false, gso_partial, encap;
1301 struct sk_buff *segs = ERR_PTR(-EINVAL);
1302 const struct net_offload *ops;
1303 unsigned int offset = 0;
1304 struct iphdr *iph;
1305 int proto, tot_len;
1306 int nhoff;
1307 int ihl;
1308 int id;
1309
1310 skb_reset_network_header(skb);
1311 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1312 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1313 goto out;
1314
1315 iph = ip_hdr(skb);
1316 ihl = iph->ihl * 4;
1317 if (ihl < sizeof(*iph))
1318 goto out;
1319
1320 id = ntohs(iph->id);
1321 proto = iph->protocol;
1322
1323 /* Warning: after this point, iph might be no longer valid */
1324 if (unlikely(!pskb_may_pull(skb, ihl)))
1325 goto out;
1326 __skb_pull(skb, ihl);
1327
1328 encap = SKB_GSO_CB(skb)->encap_level > 0;
1329 if (encap)
1330 features &= skb->dev->hw_enc_features;
1331 SKB_GSO_CB(skb)->encap_level += ihl;
1332
1333 skb_reset_transport_header(skb);
1334
1335 segs = ERR_PTR(-EPROTONOSUPPORT);
1336
1337 if (!skb->encapsulation || encap) {
1338 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1339 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1340
1341 /* fixed ID is invalid if DF bit is not set */
1342 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1343 goto out;
1344 }
1345
1346 ops = rcu_dereference(inet_offloads[proto]);
1347 if (likely(ops && ops->callbacks.gso_segment))
1348 segs = ops->callbacks.gso_segment(skb, features);
1349
1350 if (IS_ERR_OR_NULL(segs))
1351 goto out;
1352
1353 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1354
1355 skb = segs;
1356 do {
1357 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1358 if (udpfrag) {
1359 iph->frag_off = htons(offset >> 3);
1360 if (skb->next)
1361 iph->frag_off |= htons(IP_MF);
1362 offset += skb->len - nhoff - ihl;
1363 tot_len = skb->len - nhoff;
1364 } else if (skb_is_gso(skb)) {
1365 if (!fixedid) {
1366 iph->id = htons(id);
1367 id += skb_shinfo(skb)->gso_segs;
1368 }
1369
1370 if (gso_partial)
1371 tot_len = skb_shinfo(skb)->gso_size +
1372 SKB_GSO_CB(skb)->data_offset +
1373 skb->head - (unsigned char *)iph;
1374 else
1375 tot_len = skb->len - nhoff;
1376 } else {
1377 if (!fixedid)
1378 iph->id = htons(id++);
1379 tot_len = skb->len - nhoff;
1380 }
1381 iph->tot_len = htons(tot_len);
1382 ip_send_check(iph);
1383 if (encap)
1384 skb_reset_inner_headers(skb);
1385 skb->network_header = (u8 *)iph - skb->head;
1386 skb_reset_mac_len(skb);
1387 } while ((skb = skb->next));
1388
1389out:
1390 return segs;
1391}
1392EXPORT_SYMBOL(inet_gso_segment);
1393
1394static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1395 netdev_features_t features)
1396{
1397 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1398 return ERR_PTR(-EINVAL);
1399
1400 return inet_gso_segment(skb, features);
1401}
1402
1403INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *,
1404 struct sk_buff *));
1405INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
1406 struct sk_buff *));
1407struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1408{
1409 const struct net_offload *ops;
1410 struct sk_buff *pp = NULL;
1411 const struct iphdr *iph;
1412 struct sk_buff *p;
1413 unsigned int hlen;
1414 unsigned int off;
1415 unsigned int id;
1416 int flush = 1;
1417 int proto;
1418
1419 off = skb_gro_offset(skb);
1420 hlen = off + sizeof(*iph);
1421 iph = skb_gro_header_fast(skb, off);
1422 if (skb_gro_header_hard(skb, hlen)) {
1423 iph = skb_gro_header_slow(skb, hlen, off);
1424 if (unlikely(!iph))
1425 goto out;
1426 }
1427
1428 proto = iph->protocol;
1429
1430 rcu_read_lock();
1431 ops = rcu_dereference(inet_offloads[proto]);
1432 if (!ops || !ops->callbacks.gro_receive)
1433 goto out_unlock;
1434
1435 if (*(u8 *)iph != 0x45)
1436 goto out_unlock;
1437
1438 if (ip_is_fragment(iph))
1439 goto out_unlock;
1440
1441 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1442 goto out_unlock;
1443
1444 id = ntohl(*(__be32 *)&iph->id);
1445 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1446 id >>= 16;
1447
1448 list_for_each_entry(p, head, list) {
1449 struct iphdr *iph2;
1450 u16 flush_id;
1451
1452 if (!NAPI_GRO_CB(p)->same_flow)
1453 continue;
1454
1455 iph2 = (struct iphdr *)(p->data + off);
1456 /* The above works because, with the exception of the top
1457 * (inner most) layer, we only aggregate pkts with the same
1458 * hdr length so all the hdrs we'll need to verify will start
1459 * at the same offset.
1460 */
1461 if ((iph->protocol ^ iph2->protocol) |
1462 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1463 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1464 NAPI_GRO_CB(p)->same_flow = 0;
1465 continue;
1466 }
1467
1468 /* All fields must match except length and checksum. */
1469 NAPI_GRO_CB(p)->flush |=
1470 (iph->ttl ^ iph2->ttl) |
1471 (iph->tos ^ iph2->tos) |
1472 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1473
1474 NAPI_GRO_CB(p)->flush |= flush;
1475
1476 /* We need to store of the IP ID check to be included later
1477 * when we can verify that this packet does in fact belong
1478 * to a given flow.
1479 */
1480 flush_id = (u16)(id - ntohs(iph2->id));
1481
1482 /* This bit of code makes it much easier for us to identify
1483 * the cases where we are doing atomic vs non-atomic IP ID
1484 * checks. Specifically an atomic check can return IP ID
1485 * values 0 - 0xFFFF, while a non-atomic check can only
1486 * return 0 or 0xFFFF.
1487 */
1488 if (!NAPI_GRO_CB(p)->is_atomic ||
1489 !(iph->frag_off & htons(IP_DF))) {
1490 flush_id ^= NAPI_GRO_CB(p)->count;
1491 flush_id = flush_id ? 0xFFFF : 0;
1492 }
1493
1494 /* If the previous IP ID value was based on an atomic
1495 * datagram we can overwrite the value and ignore it.
1496 */
1497 if (NAPI_GRO_CB(skb)->is_atomic)
1498 NAPI_GRO_CB(p)->flush_id = flush_id;
1499 else
1500 NAPI_GRO_CB(p)->flush_id |= flush_id;
1501 }
1502
1503 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1504 NAPI_GRO_CB(skb)->flush |= flush;
1505 skb_set_network_header(skb, off);
1506 /* The above will be needed by the transport layer if there is one
1507 * immediately following this IP hdr.
1508 */
1509
1510 /* Note : No need to call skb_gro_postpull_rcsum() here,
1511 * as we already checked checksum over ipv4 header was 0
1512 */
1513 skb_gro_pull(skb, sizeof(*iph));
1514 skb_set_transport_header(skb, skb_gro_offset(skb));
1515
1516 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1517 ops->callbacks.gro_receive, head, skb);
1518
1519out_unlock:
1520 rcu_read_unlock();
1521
1522out:
1523 skb_gro_flush_final(skb, pp, flush);
1524
1525 return pp;
1526}
1527EXPORT_SYMBOL(inet_gro_receive);
1528
1529static struct sk_buff *ipip_gro_receive(struct list_head *head,
1530 struct sk_buff *skb)
1531{
1532 if (NAPI_GRO_CB(skb)->encap_mark) {
1533 NAPI_GRO_CB(skb)->flush = 1;
1534 return NULL;
1535 }
1536
1537 NAPI_GRO_CB(skb)->encap_mark = 1;
1538
1539 return inet_gro_receive(head, skb);
1540}
1541
1542#define SECONDS_PER_DAY 86400
1543
1544/* inet_current_timestamp - Return IP network timestamp
1545 *
1546 * Return milliseconds since midnight in network byte order.
1547 */
1548__be32 inet_current_timestamp(void)
1549{
1550 u32 secs;
1551 u32 msecs;
1552 struct timespec64 ts;
1553
1554 ktime_get_real_ts64(&ts);
1555
1556 /* Get secs since midnight. */
1557 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1558 /* Convert to msecs. */
1559 msecs = secs * MSEC_PER_SEC;
1560 /* Convert nsec to msec. */
1561 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1562
1563 /* Convert to network byte order. */
1564 return htonl(msecs);
1565}
1566EXPORT_SYMBOL(inet_current_timestamp);
1567
1568int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1569{
1570 if (sk->sk_family == AF_INET)
1571 return ip_recv_error(sk, msg, len, addr_len);
1572#if IS_ENABLED(CONFIG_IPV6)
1573 if (sk->sk_family == AF_INET6)
1574 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1575#endif
1576 return -EINVAL;
1577}
1578
1579INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *, int));
1580INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int));
1581int inet_gro_complete(struct sk_buff *skb, int nhoff)
1582{
1583 __be16 newlen = htons(skb->len - nhoff);
1584 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1585 const struct net_offload *ops;
1586 int proto = iph->protocol;
1587 int err = -ENOSYS;
1588
1589 if (skb->encapsulation) {
1590 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1591 skb_set_inner_network_header(skb, nhoff);
1592 }
1593
1594 csum_replace2(&iph->check, iph->tot_len, newlen);
1595 iph->tot_len = newlen;
1596
1597 rcu_read_lock();
1598 ops = rcu_dereference(inet_offloads[proto]);
1599 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1600 goto out_unlock;
1601
1602 /* Only need to add sizeof(*iph) to get to the next hdr below
1603 * because any hdr with option will have been flushed in
1604 * inet_gro_receive().
1605 */
1606 err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1607 tcp4_gro_complete, udp4_gro_complete,
1608 skb, nhoff + sizeof(*iph));
1609
1610out_unlock:
1611 rcu_read_unlock();
1612
1613 return err;
1614}
1615EXPORT_SYMBOL(inet_gro_complete);
1616
1617static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1618{
1619 skb->encapsulation = 1;
1620 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1621 return inet_gro_complete(skb, nhoff);
1622}
1623
1624int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1625 unsigned short type, unsigned char protocol,
1626 struct net *net)
1627{
1628 struct socket *sock;
1629 int rc = sock_create_kern(net, family, type, protocol, &sock);
1630
1631 if (rc == 0) {
1632 *sk = sock->sk;
1633 (*sk)->sk_allocation = GFP_ATOMIC;
1634 /*
1635 * Unhash it so that IP input processing does not even see it,
1636 * we do not wish this socket to see incoming packets.
1637 */
1638 (*sk)->sk_prot->unhash(*sk);
1639 }
1640 return rc;
1641}
1642EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1643
1644u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1645{
1646 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1647}
1648EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1649
1650unsigned long snmp_fold_field(void __percpu *mib, int offt)
1651{
1652 unsigned long res = 0;
1653 int i;
1654
1655 for_each_possible_cpu(i)
1656 res += snmp_get_cpu_field(mib, i, offt);
1657 return res;
1658}
1659EXPORT_SYMBOL_GPL(snmp_fold_field);
1660
1661#if BITS_PER_LONG==32
1662
1663u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1664 size_t syncp_offset)
1665{
1666 void *bhptr;
1667 struct u64_stats_sync *syncp;
1668 u64 v;
1669 unsigned int start;
1670
1671 bhptr = per_cpu_ptr(mib, cpu);
1672 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1673 do {
1674 start = u64_stats_fetch_begin_irq(syncp);
1675 v = *(((u64 *)bhptr) + offt);
1676 } while (u64_stats_fetch_retry_irq(syncp, start));
1677
1678 return v;
1679}
1680EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1681
1682u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1683{
1684 u64 res = 0;
1685 int cpu;
1686
1687 for_each_possible_cpu(cpu) {
1688 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1689 }
1690 return res;
1691}
1692EXPORT_SYMBOL_GPL(snmp_fold_field64);
1693#endif
1694
1695#ifdef CONFIG_IP_MULTICAST
1696static const struct net_protocol igmp_protocol = {
1697 .handler = igmp_rcv,
1698 .netns_ok = 1,
1699};
1700#endif
1701
1702/* thinking of making this const? Don't.
1703 * early_demux can change based on sysctl.
1704 */
1705static struct net_protocol tcp_protocol = {
1706 .early_demux = tcp_v4_early_demux,
1707 .early_demux_handler = tcp_v4_early_demux,
1708 .handler = tcp_v4_rcv,
1709 .err_handler = tcp_v4_err,
1710 .no_policy = 1,
1711 .netns_ok = 1,
1712 .icmp_strict_tag_validation = 1,
1713};
1714
1715/* thinking of making this const? Don't.
1716 * early_demux can change based on sysctl.
1717 */
1718static struct net_protocol udp_protocol = {
1719 .early_demux = udp_v4_early_demux,
1720 .early_demux_handler = udp_v4_early_demux,
1721 .handler = udp_rcv,
1722 .err_handler = udp_err,
1723 .no_policy = 1,
1724 .netns_ok = 1,
1725};
1726
1727static const struct net_protocol icmp_protocol = {
1728 .handler = icmp_rcv,
1729 .err_handler = icmp_err,
1730 .no_policy = 1,
1731 .netns_ok = 1,
1732};
1733
1734static __net_init int ipv4_mib_init_net(struct net *net)
1735{
1736 int i;
1737
1738 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1739 if (!net->mib.tcp_statistics)
1740 goto err_tcp_mib;
1741 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1742 if (!net->mib.ip_statistics)
1743 goto err_ip_mib;
1744
1745 for_each_possible_cpu(i) {
1746 struct ipstats_mib *af_inet_stats;
1747 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1748 u64_stats_init(&af_inet_stats->syncp);
1749 }
1750
1751 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1752 if (!net->mib.net_statistics)
1753 goto err_net_mib;
1754 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1755 if (!net->mib.udp_statistics)
1756 goto err_udp_mib;
1757 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1758 if (!net->mib.udplite_statistics)
1759 goto err_udplite_mib;
1760 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1761 if (!net->mib.icmp_statistics)
1762 goto err_icmp_mib;
1763 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1764 GFP_KERNEL);
1765 if (!net->mib.icmpmsg_statistics)
1766 goto err_icmpmsg_mib;
1767
1768 tcp_mib_init(net);
1769 return 0;
1770
1771err_icmpmsg_mib:
1772 free_percpu(net->mib.icmp_statistics);
1773err_icmp_mib:
1774 free_percpu(net->mib.udplite_statistics);
1775err_udplite_mib:
1776 free_percpu(net->mib.udp_statistics);
1777err_udp_mib:
1778 free_percpu(net->mib.net_statistics);
1779err_net_mib:
1780 free_percpu(net->mib.ip_statistics);
1781err_ip_mib:
1782 free_percpu(net->mib.tcp_statistics);
1783err_tcp_mib:
1784 return -ENOMEM;
1785}
1786
1787static __net_exit void ipv4_mib_exit_net(struct net *net)
1788{
1789 kfree(net->mib.icmpmsg_statistics);
1790 free_percpu(net->mib.icmp_statistics);
1791 free_percpu(net->mib.udplite_statistics);
1792 free_percpu(net->mib.udp_statistics);
1793 free_percpu(net->mib.net_statistics);
1794 free_percpu(net->mib.ip_statistics);
1795 free_percpu(net->mib.tcp_statistics);
1796}
1797
1798static __net_initdata struct pernet_operations ipv4_mib_ops = {
1799 .init = ipv4_mib_init_net,
1800 .exit = ipv4_mib_exit_net,
1801};
1802
1803static int __init init_ipv4_mibs(void)
1804{
1805 return register_pernet_subsys(&ipv4_mib_ops);
1806}
1807
1808static __net_init int inet_init_net(struct net *net)
1809{
1810 /*
1811 * Set defaults for local port range
1812 */
1813 seqlock_init(&net->ipv4.ip_local_ports.lock);
1814 net->ipv4.ip_local_ports.range[0] = 32768;
1815 net->ipv4.ip_local_ports.range[1] = 60999;
1816
1817 seqlock_init(&net->ipv4.ping_group_range.lock);
1818 /*
1819 * Sane defaults - nobody may create ping sockets.
1820 * Boot scripts should set this to distro-specific group.
1821 */
1822 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1823 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1824
1825 /* Default values for sysctl-controlled parameters.
1826 * We set them here, in case sysctl is not compiled.
1827 */
1828 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1829 net->ipv4.sysctl_ip_fwd_update_priority = 1;
1830 net->ipv4.sysctl_ip_dynaddr = 0;
1831 net->ipv4.sysctl_ip_early_demux = 1;
1832 net->ipv4.sysctl_udp_early_demux = 1;
1833 net->ipv4.sysctl_tcp_early_demux = 1;
1834#ifdef CONFIG_SYSCTL
1835 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1836#endif
1837
1838 /* Some igmp sysctl, whose values are always used */
1839 net->ipv4.sysctl_igmp_max_memberships = 20;
1840 net->ipv4.sysctl_igmp_max_msf = 10;
1841 /* IGMP reports for link-local multicast groups are enabled by default */
1842 net->ipv4.sysctl_igmp_llm_reports = 1;
1843 net->ipv4.sysctl_igmp_qrv = 2;
1844
1845 return 0;
1846}
1847
1848static __net_initdata struct pernet_operations af_inet_ops = {
1849 .init = inet_init_net,
1850};
1851
1852static int __init init_inet_pernet_ops(void)
1853{
1854 return register_pernet_subsys(&af_inet_ops);
1855}
1856
1857static int ipv4_proc_init(void);
1858
1859/*
1860 * IP protocol layer initialiser
1861 */
1862
1863static struct packet_offload ip_packet_offload __read_mostly = {
1864 .type = cpu_to_be16(ETH_P_IP),
1865 .callbacks = {
1866 .gso_segment = inet_gso_segment,
1867 .gro_receive = inet_gro_receive,
1868 .gro_complete = inet_gro_complete,
1869 },
1870};
1871
1872static const struct net_offload ipip_offload = {
1873 .callbacks = {
1874 .gso_segment = ipip_gso_segment,
1875 .gro_receive = ipip_gro_receive,
1876 .gro_complete = ipip_gro_complete,
1877 },
1878};
1879
1880static int __init ipip_offload_init(void)
1881{
1882 return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1883}
1884
1885static int __init ipv4_offload_init(void)
1886{
1887 /*
1888 * Add offloads
1889 */
1890 if (udpv4_offload_init() < 0)
1891 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1892 if (tcpv4_offload_init() < 0)
1893 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1894 if (ipip_offload_init() < 0)
1895 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1896
1897 dev_add_offload(&ip_packet_offload);
1898 return 0;
1899}
1900
1901fs_initcall(ipv4_offload_init);
1902
1903static struct packet_type ip_packet_type __read_mostly = {
1904 .type = cpu_to_be16(ETH_P_IP),
1905 .func = ip_rcv,
1906 .list_func = ip_list_rcv,
1907};
1908
1909static int __init inet_init(void)
1910{
1911 struct inet_protosw *q;
1912 struct list_head *r;
1913 int rc = -EINVAL;
1914
1915 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1916
1917 rc = proto_register(&tcp_prot, 1);
1918 if (rc)
1919 goto out;
1920
1921 rc = proto_register(&udp_prot, 1);
1922 if (rc)
1923 goto out_unregister_tcp_proto;
1924
1925 rc = proto_register(&raw_prot, 1);
1926 if (rc)
1927 goto out_unregister_udp_proto;
1928
1929 rc = proto_register(&ping_prot, 1);
1930 if (rc)
1931 goto out_unregister_raw_proto;
1932
1933 /*
1934 * Tell SOCKET that we are alive...
1935 */
1936
1937 (void)sock_register(&inet_family_ops);
1938
1939#ifdef CONFIG_SYSCTL
1940 ip_static_sysctl_init();
1941#endif
1942
1943 /*
1944 * Add all the base protocols.
1945 */
1946
1947 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1948 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1949 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1950 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1951 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1952 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1953#ifdef CONFIG_IP_MULTICAST
1954 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1955 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1956#endif
1957
1958 /* Register the socket-side information for inet_create. */
1959 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1960 INIT_LIST_HEAD(r);
1961
1962 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1963 inet_register_protosw(q);
1964
1965 /*
1966 * Set the ARP module up
1967 */
1968
1969 arp_init();
1970
1971 /*
1972 * Set the IP module up
1973 */
1974
1975 ip_init();
1976
1977 /* Setup TCP slab cache for open requests. */
1978 tcp_init();
1979
1980 /* Setup UDP memory threshold */
1981 udp_init();
1982
1983 /* Add UDP-Lite (RFC 3828) */
1984 udplite4_register();
1985
1986 raw_init();
1987
1988 ping_init();
1989
1990 /*
1991 * Set the ICMP layer up
1992 */
1993
1994 if (icmp_init() < 0)
1995 panic("Failed to create the ICMP control socket.\n");
1996
1997 /*
1998 * Initialise the multicast router
1999 */
2000#if defined(CONFIG_IP_MROUTE)
2001 if (ip_mr_init())
2002 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2003#endif
2004
2005 if (init_inet_pernet_ops())
2006 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2007 /*
2008 * Initialise per-cpu ipv4 mibs
2009 */
2010
2011 if (init_ipv4_mibs())
2012 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
2013
2014 ipv4_proc_init();
2015
2016 ipfrag_init();
2017
2018 dev_add_pack(&ip_packet_type);
2019
2020 ip_tunnel_core_init();
2021
2022 rc = 0;
2023out:
2024 return rc;
2025out_unregister_raw_proto:
2026 proto_unregister(&raw_prot);
2027out_unregister_udp_proto:
2028 proto_unregister(&udp_prot);
2029out_unregister_tcp_proto:
2030 proto_unregister(&tcp_prot);
2031 goto out;
2032}
2033
2034fs_initcall(inet_init);
2035
2036/* ------------------------------------------------------------------------ */
2037
2038#ifdef CONFIG_PROC_FS
2039static int __init ipv4_proc_init(void)
2040{
2041 int rc = 0;
2042
2043 if (raw_proc_init())
2044 goto out_raw;
2045 if (tcp4_proc_init())
2046 goto out_tcp;
2047 if (udp4_proc_init())
2048 goto out_udp;
2049 if (ping_proc_init())
2050 goto out_ping;
2051 if (ip_misc_proc_init())
2052 goto out_misc;
2053out:
2054 return rc;
2055out_misc:
2056 ping_proc_exit();
2057out_ping:
2058 udp4_proc_exit();
2059out_udp:
2060 tcp4_proc_exit();
2061out_tcp:
2062 raw_proc_exit();
2063out_raw:
2064 rc = -ENOMEM;
2065 goto out;
2066}
2067
2068#else /* CONFIG_PROC_FS */
2069static int __init ipv4_proc_init(void)
2070{
2071 return 0;
2072}
2073#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/module.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 <asm/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 /* Check special setups for testing purpose to enable TFO w/o
215 * requiring TCP_FASTOPEN sockopt.
216 * Note that only TCP sockets (SOCK_STREAM) will reach here.
217 * Also fastopenq may already been allocated because this
218 * socket was in TCP_LISTEN state previously but was
219 * shutdown() (rather than close()).
220 */
221 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 &&
222 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
223 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0)
224 fastopen_queue_tune(sk, backlog);
225 else if ((sysctl_tcp_fastopen &
226 TFO_SERVER_WO_SOCKOPT2) != 0)
227 fastopen_queue_tune(sk,
228 ((uint)sysctl_tcp_fastopen) >> 16);
229
230 tcp_fastopen_init_key_once(true);
231 }
232 err = inet_csk_listen_start(sk, backlog);
233 if (err)
234 goto out;
235 }
236 sk->sk_max_ack_backlog = backlog;
237 err = 0;
238
239out:
240 release_sock(sk);
241 return err;
242}
243EXPORT_SYMBOL(inet_listen);
244
245/*
246 * Create an inet socket.
247 */
248
249static int inet_create(struct net *net, struct socket *sock, int protocol,
250 int kern)
251{
252 struct sock *sk;
253 struct inet_protosw *answer;
254 struct inet_sock *inet;
255 struct proto *answer_prot;
256 unsigned char answer_flags;
257 int try_loading_module = 0;
258 int err;
259
260 if (protocol < 0 || protocol >= IPPROTO_MAX)
261 return -EINVAL;
262
263 sock->state = SS_UNCONNECTED;
264
265 /* Look for the requested type/protocol pair. */
266lookup_protocol:
267 err = -ESOCKTNOSUPPORT;
268 rcu_read_lock();
269 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
270
271 err = 0;
272 /* Check the non-wild match. */
273 if (protocol == answer->protocol) {
274 if (protocol != IPPROTO_IP)
275 break;
276 } else {
277 /* Check for the two wild cases. */
278 if (IPPROTO_IP == protocol) {
279 protocol = answer->protocol;
280 break;
281 }
282 if (IPPROTO_IP == answer->protocol)
283 break;
284 }
285 err = -EPROTONOSUPPORT;
286 }
287
288 if (unlikely(err)) {
289 if (try_loading_module < 2) {
290 rcu_read_unlock();
291 /*
292 * Be more specific, e.g. net-pf-2-proto-132-type-1
293 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
294 */
295 if (++try_loading_module == 1)
296 request_module("net-pf-%d-proto-%d-type-%d",
297 PF_INET, protocol, sock->type);
298 /*
299 * Fall back to generic, e.g. net-pf-2-proto-132
300 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
301 */
302 else
303 request_module("net-pf-%d-proto-%d",
304 PF_INET, protocol);
305 goto lookup_protocol;
306 } else
307 goto out_rcu_unlock;
308 }
309
310 err = -EPERM;
311 if (sock->type == SOCK_RAW && !kern &&
312 !ns_capable(net->user_ns, CAP_NET_RAW))
313 goto out_rcu_unlock;
314
315 sock->ops = answer->ops;
316 answer_prot = answer->prot;
317 answer_flags = answer->flags;
318 rcu_read_unlock();
319
320 WARN_ON(!answer_prot->slab);
321
322 err = -ENOBUFS;
323 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
324 if (!sk)
325 goto out;
326
327 err = 0;
328 if (INET_PROTOSW_REUSE & answer_flags)
329 sk->sk_reuse = SK_CAN_REUSE;
330
331 inet = inet_sk(sk);
332 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
333
334 inet->nodefrag = 0;
335
336 if (SOCK_RAW == sock->type) {
337 inet->inet_num = protocol;
338 if (IPPROTO_RAW == protocol)
339 inet->hdrincl = 1;
340 }
341
342 if (net->ipv4.sysctl_ip_no_pmtu_disc)
343 inet->pmtudisc = IP_PMTUDISC_DONT;
344 else
345 inet->pmtudisc = IP_PMTUDISC_WANT;
346
347 inet->inet_id = 0;
348
349 sock_init_data(sock, sk);
350
351 sk->sk_destruct = inet_sock_destruct;
352 sk->sk_protocol = protocol;
353 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
354
355 inet->uc_ttl = -1;
356 inet->mc_loop = 1;
357 inet->mc_ttl = 1;
358 inet->mc_all = 1;
359 inet->mc_index = 0;
360 inet->mc_list = NULL;
361 inet->rcv_tos = 0;
362
363 sk_refcnt_debug_inc(sk);
364
365 if (inet->inet_num) {
366 /* It assumes that any protocol which allows
367 * the user to assign a number at socket
368 * creation time automatically
369 * shares.
370 */
371 inet->inet_sport = htons(inet->inet_num);
372 /* Add to protocol hash chains. */
373 err = sk->sk_prot->hash(sk);
374 if (err) {
375 sk_common_release(sk);
376 goto out;
377 }
378 }
379
380 if (sk->sk_prot->init) {
381 err = sk->sk_prot->init(sk);
382 if (err)
383 sk_common_release(sk);
384 }
385out:
386 return err;
387out_rcu_unlock:
388 rcu_read_unlock();
389 goto out;
390}
391
392
393/*
394 * The peer socket should always be NULL (or else). When we call this
395 * function we are destroying the object and from then on nobody
396 * should refer to it.
397 */
398int inet_release(struct socket *sock)
399{
400 struct sock *sk = sock->sk;
401
402 if (sk) {
403 long timeout;
404
405 /* Applications forget to leave groups before exiting */
406 ip_mc_drop_socket(sk);
407
408 /* If linger is set, we don't return until the close
409 * is complete. Otherwise we return immediately. The
410 * actually closing is done the same either way.
411 *
412 * If the close is due to the process exiting, we never
413 * linger..
414 */
415 timeout = 0;
416 if (sock_flag(sk, SOCK_LINGER) &&
417 !(current->flags & PF_EXITING))
418 timeout = sk->sk_lingertime;
419 sock->sk = NULL;
420 sk->sk_prot->close(sk, timeout);
421 }
422 return 0;
423}
424EXPORT_SYMBOL(inet_release);
425
426int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
427{
428 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
429 struct sock *sk = sock->sk;
430 struct inet_sock *inet = inet_sk(sk);
431 struct net *net = sock_net(sk);
432 unsigned short snum;
433 int chk_addr_ret;
434 u32 tb_id = RT_TABLE_LOCAL;
435 int err;
436
437 /* If the socket has its own bind function then use it. (RAW) */
438 if (sk->sk_prot->bind) {
439 err = sk->sk_prot->bind(sk, uaddr, addr_len);
440 goto out;
441 }
442 err = -EINVAL;
443 if (addr_len < sizeof(struct sockaddr_in))
444 goto out;
445
446 if (addr->sin_family != AF_INET) {
447 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
448 * only if s_addr is INADDR_ANY.
449 */
450 err = -EAFNOSUPPORT;
451 if (addr->sin_family != AF_UNSPEC ||
452 addr->sin_addr.s_addr != htonl(INADDR_ANY))
453 goto out;
454 }
455
456 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
457 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
458
459 /* Not specified by any standard per-se, however it breaks too
460 * many applications when removed. It is unfortunate since
461 * allowing applications to make a non-local bind solves
462 * several problems with systems using dynamic addressing.
463 * (ie. your servers still start up even if your ISDN link
464 * is temporarily down)
465 */
466 err = -EADDRNOTAVAIL;
467 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
468 !(inet->freebind || inet->transparent) &&
469 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
470 chk_addr_ret != RTN_LOCAL &&
471 chk_addr_ret != RTN_MULTICAST &&
472 chk_addr_ret != RTN_BROADCAST)
473 goto out;
474
475 snum = ntohs(addr->sin_port);
476 err = -EACCES;
477 if (snum && snum < PROT_SOCK &&
478 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
479 goto out;
480
481 /* We keep a pair of addresses. rcv_saddr is the one
482 * used by hash lookups, and saddr is used for transmit.
483 *
484 * In the BSD API these are the same except where it
485 * would be illegal to use them (multicast/broadcast) in
486 * which case the sending device address is used.
487 */
488 lock_sock(sk);
489
490 /* Check these errors (active socket, double bind). */
491 err = -EINVAL;
492 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
493 goto out_release_sock;
494
495 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
496 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
497 inet->inet_saddr = 0; /* Use device */
498
499 /* Make sure we are allowed to bind here. */
500 if ((snum || !inet->bind_address_no_port) &&
501 sk->sk_prot->get_port(sk, snum)) {
502 inet->inet_saddr = inet->inet_rcv_saddr = 0;
503 err = -EADDRINUSE;
504 goto out_release_sock;
505 }
506
507 if (inet->inet_rcv_saddr)
508 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
509 if (snum)
510 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
511 inet->inet_sport = htons(inet->inet_num);
512 inet->inet_daddr = 0;
513 inet->inet_dport = 0;
514 sk_dst_reset(sk);
515 err = 0;
516out_release_sock:
517 release_sock(sk);
518out:
519 return err;
520}
521EXPORT_SYMBOL(inet_bind);
522
523int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
524 int addr_len, int flags)
525{
526 struct sock *sk = sock->sk;
527
528 if (addr_len < sizeof(uaddr->sa_family))
529 return -EINVAL;
530 if (uaddr->sa_family == AF_UNSPEC)
531 return sk->sk_prot->disconnect(sk, flags);
532
533 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
534 return -EAGAIN;
535 return sk->sk_prot->connect(sk, uaddr, addr_len);
536}
537EXPORT_SYMBOL(inet_dgram_connect);
538
539static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
540{
541 DEFINE_WAIT(wait);
542
543 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
544 sk->sk_write_pending += writebias;
545
546 /* Basic assumption: if someone sets sk->sk_err, he _must_
547 * change state of the socket from TCP_SYN_*.
548 * Connect() does not allow to get error notifications
549 * without closing the socket.
550 */
551 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
552 release_sock(sk);
553 timeo = schedule_timeout(timeo);
554 lock_sock(sk);
555 if (signal_pending(current) || !timeo)
556 break;
557 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
558 }
559 finish_wait(sk_sleep(sk), &wait);
560 sk->sk_write_pending -= writebias;
561 return timeo;
562}
563
564/*
565 * Connect to a remote host. There is regrettably still a little
566 * TCP 'magic' in here.
567 */
568int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
569 int addr_len, int flags)
570{
571 struct sock *sk = sock->sk;
572 int err;
573 long timeo;
574
575 if (addr_len < sizeof(uaddr->sa_family))
576 return -EINVAL;
577
578 if (uaddr->sa_family == AF_UNSPEC) {
579 err = sk->sk_prot->disconnect(sk, flags);
580 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
581 goto out;
582 }
583
584 switch (sock->state) {
585 default:
586 err = -EINVAL;
587 goto out;
588 case SS_CONNECTED:
589 err = -EISCONN;
590 goto out;
591 case SS_CONNECTING:
592 err = -EALREADY;
593 /* Fall out of switch with err, set for this state */
594 break;
595 case SS_UNCONNECTED:
596 err = -EISCONN;
597 if (sk->sk_state != TCP_CLOSE)
598 goto out;
599
600 err = sk->sk_prot->connect(sk, uaddr, addr_len);
601 if (err < 0)
602 goto out;
603
604 sock->state = SS_CONNECTING;
605
606 /* Just entered SS_CONNECTING state; the only
607 * difference is that return value in non-blocking
608 * case is EINPROGRESS, rather than EALREADY.
609 */
610 err = -EINPROGRESS;
611 break;
612 }
613
614 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
615
616 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
617 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
618 tcp_sk(sk)->fastopen_req &&
619 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
620
621 /* Error code is set above */
622 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
623 goto out;
624
625 err = sock_intr_errno(timeo);
626 if (signal_pending(current))
627 goto out;
628 }
629
630 /* Connection was closed by RST, timeout, ICMP error
631 * or another process disconnected us.
632 */
633 if (sk->sk_state == TCP_CLOSE)
634 goto sock_error;
635
636 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
637 * and error was received after socket entered established state.
638 * Hence, it is handled normally after connect() return successfully.
639 */
640
641 sock->state = SS_CONNECTED;
642 err = 0;
643out:
644 return err;
645
646sock_error:
647 err = sock_error(sk) ? : -ECONNABORTED;
648 sock->state = SS_UNCONNECTED;
649 if (sk->sk_prot->disconnect(sk, flags))
650 sock->state = SS_DISCONNECTING;
651 goto out;
652}
653EXPORT_SYMBOL(__inet_stream_connect);
654
655int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
656 int addr_len, int flags)
657{
658 int err;
659
660 lock_sock(sock->sk);
661 err = __inet_stream_connect(sock, uaddr, addr_len, flags);
662 release_sock(sock->sk);
663 return err;
664}
665EXPORT_SYMBOL(inet_stream_connect);
666
667/*
668 * Accept a pending connection. The TCP layer now gives BSD semantics.
669 */
670
671int inet_accept(struct socket *sock, struct socket *newsock, int flags)
672{
673 struct sock *sk1 = sock->sk;
674 int err = -EINVAL;
675 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
676
677 if (!sk2)
678 goto do_err;
679
680 lock_sock(sk2);
681
682 sock_rps_record_flow(sk2);
683 WARN_ON(!((1 << sk2->sk_state) &
684 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
685 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
686
687 sock_graft(sk2, newsock);
688
689 newsock->state = SS_CONNECTED;
690 err = 0;
691 release_sock(sk2);
692do_err:
693 return err;
694}
695EXPORT_SYMBOL(inet_accept);
696
697
698/*
699 * This does both peername and sockname.
700 */
701int inet_getname(struct socket *sock, struct sockaddr *uaddr,
702 int *uaddr_len, int peer)
703{
704 struct sock *sk = sock->sk;
705 struct inet_sock *inet = inet_sk(sk);
706 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
707
708 sin->sin_family = AF_INET;
709 if (peer) {
710 if (!inet->inet_dport ||
711 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
712 peer == 1))
713 return -ENOTCONN;
714 sin->sin_port = inet->inet_dport;
715 sin->sin_addr.s_addr = inet->inet_daddr;
716 } else {
717 __be32 addr = inet->inet_rcv_saddr;
718 if (!addr)
719 addr = inet->inet_saddr;
720 sin->sin_port = inet->inet_sport;
721 sin->sin_addr.s_addr = addr;
722 }
723 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
724 *uaddr_len = sizeof(*sin);
725 return 0;
726}
727EXPORT_SYMBOL(inet_getname);
728
729int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
730{
731 struct sock *sk = sock->sk;
732
733 sock_rps_record_flow(sk);
734
735 /* We may need to bind the socket. */
736 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
737 inet_autobind(sk))
738 return -EAGAIN;
739
740 return sk->sk_prot->sendmsg(sk, msg, size);
741}
742EXPORT_SYMBOL(inet_sendmsg);
743
744ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
745 size_t size, int flags)
746{
747 struct sock *sk = sock->sk;
748
749 sock_rps_record_flow(sk);
750
751 /* We may need to bind the socket. */
752 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
753 inet_autobind(sk))
754 return -EAGAIN;
755
756 if (sk->sk_prot->sendpage)
757 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
758 return sock_no_sendpage(sock, page, offset, size, flags);
759}
760EXPORT_SYMBOL(inet_sendpage);
761
762int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
763 int flags)
764{
765 struct sock *sk = sock->sk;
766 int addr_len = 0;
767 int err;
768
769 sock_rps_record_flow(sk);
770
771 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
772 flags & ~MSG_DONTWAIT, &addr_len);
773 if (err >= 0)
774 msg->msg_namelen = addr_len;
775 return err;
776}
777EXPORT_SYMBOL(inet_recvmsg);
778
779int inet_shutdown(struct socket *sock, int how)
780{
781 struct sock *sk = sock->sk;
782 int err = 0;
783
784 /* This should really check to make sure
785 * the socket is a TCP socket. (WHY AC...)
786 */
787 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
788 1->2 bit 2 snds.
789 2->3 */
790 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
791 return -EINVAL;
792
793 lock_sock(sk);
794 if (sock->state == SS_CONNECTING) {
795 if ((1 << sk->sk_state) &
796 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
797 sock->state = SS_DISCONNECTING;
798 else
799 sock->state = SS_CONNECTED;
800 }
801
802 switch (sk->sk_state) {
803 case TCP_CLOSE:
804 err = -ENOTCONN;
805 /* Hack to wake up other listeners, who can poll for
806 POLLHUP, even on eg. unconnected UDP sockets -- RR */
807 default:
808 sk->sk_shutdown |= how;
809 if (sk->sk_prot->shutdown)
810 sk->sk_prot->shutdown(sk, how);
811 break;
812
813 /* Remaining two branches are temporary solution for missing
814 * close() in multithreaded environment. It is _not_ a good idea,
815 * but we have no choice until close() is repaired at VFS level.
816 */
817 case TCP_LISTEN:
818 if (!(how & RCV_SHUTDOWN))
819 break;
820 /* Fall through */
821 case TCP_SYN_SENT:
822 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
823 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
824 break;
825 }
826
827 /* Wake up anyone sleeping in poll. */
828 sk->sk_state_change(sk);
829 release_sock(sk);
830 return err;
831}
832EXPORT_SYMBOL(inet_shutdown);
833
834/*
835 * ioctl() calls you can issue on an INET socket. Most of these are
836 * device configuration and stuff and very rarely used. Some ioctls
837 * pass on to the socket itself.
838 *
839 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
840 * loads the devconfigure module does its configuring and unloads it.
841 * There's a good 20K of config code hanging around the kernel.
842 */
843
844int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
845{
846 struct sock *sk = sock->sk;
847 int err = 0;
848 struct net *net = sock_net(sk);
849
850 switch (cmd) {
851 case SIOCGSTAMP:
852 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
853 break;
854 case SIOCGSTAMPNS:
855 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
856 break;
857 case SIOCADDRT:
858 case SIOCDELRT:
859 case SIOCRTMSG:
860 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
861 break;
862 case SIOCDARP:
863 case SIOCGARP:
864 case SIOCSARP:
865 err = arp_ioctl(net, cmd, (void __user *)arg);
866 break;
867 case SIOCGIFADDR:
868 case SIOCSIFADDR:
869 case SIOCGIFBRDADDR:
870 case SIOCSIFBRDADDR:
871 case SIOCGIFNETMASK:
872 case SIOCSIFNETMASK:
873 case SIOCGIFDSTADDR:
874 case SIOCSIFDSTADDR:
875 case SIOCSIFPFLAGS:
876 case SIOCGIFPFLAGS:
877 case SIOCSIFFLAGS:
878 err = devinet_ioctl(net, cmd, (void __user *)arg);
879 break;
880 default:
881 if (sk->sk_prot->ioctl)
882 err = sk->sk_prot->ioctl(sk, cmd, arg);
883 else
884 err = -ENOIOCTLCMD;
885 break;
886 }
887 return err;
888}
889EXPORT_SYMBOL(inet_ioctl);
890
891#ifdef CONFIG_COMPAT
892static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
893{
894 struct sock *sk = sock->sk;
895 int err = -ENOIOCTLCMD;
896
897 if (sk->sk_prot->compat_ioctl)
898 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
899
900 return err;
901}
902#endif
903
904const struct proto_ops inet_stream_ops = {
905 .family = PF_INET,
906 .owner = THIS_MODULE,
907 .release = inet_release,
908 .bind = inet_bind,
909 .connect = inet_stream_connect,
910 .socketpair = sock_no_socketpair,
911 .accept = inet_accept,
912 .getname = inet_getname,
913 .poll = tcp_poll,
914 .ioctl = inet_ioctl,
915 .listen = inet_listen,
916 .shutdown = inet_shutdown,
917 .setsockopt = sock_common_setsockopt,
918 .getsockopt = sock_common_getsockopt,
919 .sendmsg = inet_sendmsg,
920 .recvmsg = inet_recvmsg,
921 .mmap = sock_no_mmap,
922 .sendpage = inet_sendpage,
923 .splice_read = tcp_splice_read,
924#ifdef CONFIG_COMPAT
925 .compat_setsockopt = compat_sock_common_setsockopt,
926 .compat_getsockopt = compat_sock_common_getsockopt,
927 .compat_ioctl = inet_compat_ioctl,
928#endif
929};
930EXPORT_SYMBOL(inet_stream_ops);
931
932const struct proto_ops inet_dgram_ops = {
933 .family = PF_INET,
934 .owner = THIS_MODULE,
935 .release = inet_release,
936 .bind = inet_bind,
937 .connect = inet_dgram_connect,
938 .socketpair = sock_no_socketpair,
939 .accept = sock_no_accept,
940 .getname = inet_getname,
941 .poll = udp_poll,
942 .ioctl = inet_ioctl,
943 .listen = sock_no_listen,
944 .shutdown = inet_shutdown,
945 .setsockopt = sock_common_setsockopt,
946 .getsockopt = sock_common_getsockopt,
947 .sendmsg = inet_sendmsg,
948 .recvmsg = inet_recvmsg,
949 .mmap = sock_no_mmap,
950 .sendpage = inet_sendpage,
951#ifdef CONFIG_COMPAT
952 .compat_setsockopt = compat_sock_common_setsockopt,
953 .compat_getsockopt = compat_sock_common_getsockopt,
954 .compat_ioctl = inet_compat_ioctl,
955#endif
956};
957EXPORT_SYMBOL(inet_dgram_ops);
958
959/*
960 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
961 * udp_poll
962 */
963static const struct proto_ops inet_sockraw_ops = {
964 .family = PF_INET,
965 .owner = THIS_MODULE,
966 .release = inet_release,
967 .bind = inet_bind,
968 .connect = inet_dgram_connect,
969 .socketpair = sock_no_socketpair,
970 .accept = sock_no_accept,
971 .getname = inet_getname,
972 .poll = datagram_poll,
973 .ioctl = inet_ioctl,
974 .listen = sock_no_listen,
975 .shutdown = inet_shutdown,
976 .setsockopt = sock_common_setsockopt,
977 .getsockopt = sock_common_getsockopt,
978 .sendmsg = inet_sendmsg,
979 .recvmsg = inet_recvmsg,
980 .mmap = sock_no_mmap,
981 .sendpage = inet_sendpage,
982#ifdef CONFIG_COMPAT
983 .compat_setsockopt = compat_sock_common_setsockopt,
984 .compat_getsockopt = compat_sock_common_getsockopt,
985 .compat_ioctl = inet_compat_ioctl,
986#endif
987};
988
989static const struct net_proto_family inet_family_ops = {
990 .family = PF_INET,
991 .create = inet_create,
992 .owner = THIS_MODULE,
993};
994
995/* Upon startup we insert all the elements in inetsw_array[] into
996 * the linked list inetsw.
997 */
998static struct inet_protosw inetsw_array[] =
999{
1000 {
1001 .type = SOCK_STREAM,
1002 .protocol = IPPROTO_TCP,
1003 .prot = &tcp_prot,
1004 .ops = &inet_stream_ops,
1005 .flags = INET_PROTOSW_PERMANENT |
1006 INET_PROTOSW_ICSK,
1007 },
1008
1009 {
1010 .type = SOCK_DGRAM,
1011 .protocol = IPPROTO_UDP,
1012 .prot = &udp_prot,
1013 .ops = &inet_dgram_ops,
1014 .flags = INET_PROTOSW_PERMANENT,
1015 },
1016
1017 {
1018 .type = SOCK_DGRAM,
1019 .protocol = IPPROTO_ICMP,
1020 .prot = &ping_prot,
1021 .ops = &inet_dgram_ops,
1022 .flags = INET_PROTOSW_REUSE,
1023 },
1024
1025 {
1026 .type = SOCK_RAW,
1027 .protocol = IPPROTO_IP, /* wild card */
1028 .prot = &raw_prot,
1029 .ops = &inet_sockraw_ops,
1030 .flags = INET_PROTOSW_REUSE,
1031 }
1032};
1033
1034#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1035
1036void inet_register_protosw(struct inet_protosw *p)
1037{
1038 struct list_head *lh;
1039 struct inet_protosw *answer;
1040 int protocol = p->protocol;
1041 struct list_head *last_perm;
1042
1043 spin_lock_bh(&inetsw_lock);
1044
1045 if (p->type >= SOCK_MAX)
1046 goto out_illegal;
1047
1048 /* If we are trying to override a permanent protocol, bail. */
1049 last_perm = &inetsw[p->type];
1050 list_for_each(lh, &inetsw[p->type]) {
1051 answer = list_entry(lh, struct inet_protosw, list);
1052 /* Check only the non-wild match. */
1053 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1054 break;
1055 if (protocol == answer->protocol)
1056 goto out_permanent;
1057 last_perm = lh;
1058 }
1059
1060 /* Add the new entry after the last permanent entry if any, so that
1061 * the new entry does not override a permanent entry when matched with
1062 * a wild-card protocol. But it is allowed to override any existing
1063 * non-permanent entry. This means that when we remove this entry, the
1064 * system automatically returns to the old behavior.
1065 */
1066 list_add_rcu(&p->list, last_perm);
1067out:
1068 spin_unlock_bh(&inetsw_lock);
1069
1070 return;
1071
1072out_permanent:
1073 pr_err("Attempt to override permanent protocol %d\n", protocol);
1074 goto out;
1075
1076out_illegal:
1077 pr_err("Ignoring attempt to register invalid socket type %d\n",
1078 p->type);
1079 goto out;
1080}
1081EXPORT_SYMBOL(inet_register_protosw);
1082
1083void inet_unregister_protosw(struct inet_protosw *p)
1084{
1085 if (INET_PROTOSW_PERMANENT & p->flags) {
1086 pr_err("Attempt to unregister permanent protocol %d\n",
1087 p->protocol);
1088 } else {
1089 spin_lock_bh(&inetsw_lock);
1090 list_del_rcu(&p->list);
1091 spin_unlock_bh(&inetsw_lock);
1092
1093 synchronize_net();
1094 }
1095}
1096EXPORT_SYMBOL(inet_unregister_protosw);
1097
1098static int inet_sk_reselect_saddr(struct sock *sk)
1099{
1100 struct inet_sock *inet = inet_sk(sk);
1101 __be32 old_saddr = inet->inet_saddr;
1102 __be32 daddr = inet->inet_daddr;
1103 struct flowi4 *fl4;
1104 struct rtable *rt;
1105 __be32 new_saddr;
1106 struct ip_options_rcu *inet_opt;
1107
1108 inet_opt = rcu_dereference_protected(inet->inet_opt,
1109 sock_owned_by_user(sk));
1110 if (inet_opt && inet_opt->opt.srr)
1111 daddr = inet_opt->opt.faddr;
1112
1113 /* Query new route. */
1114 fl4 = &inet->cork.fl.u.ip4;
1115 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1116 sk->sk_bound_dev_if, sk->sk_protocol,
1117 inet->inet_sport, inet->inet_dport, sk);
1118 if (IS_ERR(rt))
1119 return PTR_ERR(rt);
1120
1121 sk_setup_caps(sk, &rt->dst);
1122
1123 new_saddr = fl4->saddr;
1124
1125 if (new_saddr == old_saddr)
1126 return 0;
1127
1128 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1129 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1130 __func__, &old_saddr, &new_saddr);
1131 }
1132
1133 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1134
1135 /*
1136 * XXX The only one ugly spot where we need to
1137 * XXX really change the sockets identity after
1138 * XXX it has entered the hashes. -DaveM
1139 *
1140 * Besides that, it does not check for connection
1141 * uniqueness. Wait for troubles.
1142 */
1143 return __sk_prot_rehash(sk);
1144}
1145
1146int inet_sk_rebuild_header(struct sock *sk)
1147{
1148 struct inet_sock *inet = inet_sk(sk);
1149 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1150 __be32 daddr;
1151 struct ip_options_rcu *inet_opt;
1152 struct flowi4 *fl4;
1153 int err;
1154
1155 /* Route is OK, nothing to do. */
1156 if (rt)
1157 return 0;
1158
1159 /* Reroute. */
1160 rcu_read_lock();
1161 inet_opt = rcu_dereference(inet->inet_opt);
1162 daddr = inet->inet_daddr;
1163 if (inet_opt && inet_opt->opt.srr)
1164 daddr = inet_opt->opt.faddr;
1165 rcu_read_unlock();
1166 fl4 = &inet->cork.fl.u.ip4;
1167 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1168 inet->inet_dport, inet->inet_sport,
1169 sk->sk_protocol, RT_CONN_FLAGS(sk),
1170 sk->sk_bound_dev_if);
1171 if (!IS_ERR(rt)) {
1172 err = 0;
1173 sk_setup_caps(sk, &rt->dst);
1174 } else {
1175 err = PTR_ERR(rt);
1176
1177 /* Routing failed... */
1178 sk->sk_route_caps = 0;
1179 /*
1180 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1181 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1182 */
1183 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1184 sk->sk_state != TCP_SYN_SENT ||
1185 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1186 (err = inet_sk_reselect_saddr(sk)) != 0)
1187 sk->sk_err_soft = -err;
1188 }
1189
1190 return err;
1191}
1192EXPORT_SYMBOL(inet_sk_rebuild_header);
1193
1194static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1195 netdev_features_t features)
1196{
1197 struct sk_buff *segs = ERR_PTR(-EINVAL);
1198 const struct net_offload *ops;
1199 unsigned int offset = 0;
1200 bool udpfrag, encap;
1201 struct iphdr *iph;
1202 int proto;
1203 int nhoff;
1204 int ihl;
1205 int id;
1206
1207 if (unlikely(skb_shinfo(skb)->gso_type &
1208 ~(SKB_GSO_TCPV4 |
1209 SKB_GSO_UDP |
1210 SKB_GSO_DODGY |
1211 SKB_GSO_TCP_ECN |
1212 SKB_GSO_GRE |
1213 SKB_GSO_GRE_CSUM |
1214 SKB_GSO_IPIP |
1215 SKB_GSO_SIT |
1216 SKB_GSO_TCPV6 |
1217 SKB_GSO_UDP_TUNNEL |
1218 SKB_GSO_UDP_TUNNEL_CSUM |
1219 SKB_GSO_TUNNEL_REMCSUM |
1220 0)))
1221 goto out;
1222
1223 skb_reset_network_header(skb);
1224 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1225 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1226 goto out;
1227
1228 iph = ip_hdr(skb);
1229 ihl = iph->ihl * 4;
1230 if (ihl < sizeof(*iph))
1231 goto out;
1232
1233 id = ntohs(iph->id);
1234 proto = iph->protocol;
1235
1236 /* Warning: after this point, iph might be no longer valid */
1237 if (unlikely(!pskb_may_pull(skb, ihl)))
1238 goto out;
1239 __skb_pull(skb, ihl);
1240
1241 encap = SKB_GSO_CB(skb)->encap_level > 0;
1242 if (encap)
1243 features &= skb->dev->hw_enc_features;
1244 SKB_GSO_CB(skb)->encap_level += ihl;
1245
1246 skb_reset_transport_header(skb);
1247
1248 segs = ERR_PTR(-EPROTONOSUPPORT);
1249
1250 if (skb->encapsulation &&
1251 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP))
1252 udpfrag = proto == IPPROTO_UDP && encap;
1253 else
1254 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation;
1255
1256 ops = rcu_dereference(inet_offloads[proto]);
1257 if (likely(ops && ops->callbacks.gso_segment))
1258 segs = ops->callbacks.gso_segment(skb, features);
1259
1260 if (IS_ERR_OR_NULL(segs))
1261 goto out;
1262
1263 skb = segs;
1264 do {
1265 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1266 if (udpfrag) {
1267 iph->id = htons(id);
1268 iph->frag_off = htons(offset >> 3);
1269 if (skb->next)
1270 iph->frag_off |= htons(IP_MF);
1271 offset += skb->len - nhoff - ihl;
1272 } else {
1273 iph->id = htons(id++);
1274 }
1275 iph->tot_len = htons(skb->len - nhoff);
1276 ip_send_check(iph);
1277 if (encap)
1278 skb_reset_inner_headers(skb);
1279 skb->network_header = (u8 *)iph - skb->head;
1280 } while ((skb = skb->next));
1281
1282out:
1283 return segs;
1284}
1285
1286static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1287 struct sk_buff *skb)
1288{
1289 const struct net_offload *ops;
1290 struct sk_buff **pp = NULL;
1291 struct sk_buff *p;
1292 const struct iphdr *iph;
1293 unsigned int hlen;
1294 unsigned int off;
1295 unsigned int id;
1296 int flush = 1;
1297 int proto;
1298
1299 off = skb_gro_offset(skb);
1300 hlen = off + sizeof(*iph);
1301 iph = skb_gro_header_fast(skb, off);
1302 if (skb_gro_header_hard(skb, hlen)) {
1303 iph = skb_gro_header_slow(skb, hlen, off);
1304 if (unlikely(!iph))
1305 goto out;
1306 }
1307
1308 proto = iph->protocol;
1309
1310 rcu_read_lock();
1311 ops = rcu_dereference(inet_offloads[proto]);
1312 if (!ops || !ops->callbacks.gro_receive)
1313 goto out_unlock;
1314
1315 if (*(u8 *)iph != 0x45)
1316 goto out_unlock;
1317
1318 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1319 goto out_unlock;
1320
1321 id = ntohl(*(__be32 *)&iph->id);
1322 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1323 id >>= 16;
1324
1325 for (p = *head; p; p = p->next) {
1326 struct iphdr *iph2;
1327
1328 if (!NAPI_GRO_CB(p)->same_flow)
1329 continue;
1330
1331 iph2 = (struct iphdr *)(p->data + off);
1332 /* The above works because, with the exception of the top
1333 * (inner most) layer, we only aggregate pkts with the same
1334 * hdr length so all the hdrs we'll need to verify will start
1335 * at the same offset.
1336 */
1337 if ((iph->protocol ^ iph2->protocol) |
1338 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1339 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1340 NAPI_GRO_CB(p)->same_flow = 0;
1341 continue;
1342 }
1343
1344 /* All fields must match except length and checksum. */
1345 NAPI_GRO_CB(p)->flush |=
1346 (iph->ttl ^ iph2->ttl) |
1347 (iph->tos ^ iph2->tos) |
1348 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1349
1350 /* Save the IP ID check to be included later when we get to
1351 * the transport layer so only the inner most IP ID is checked.
1352 * This is because some GSO/TSO implementations do not
1353 * correctly increment the IP ID for the outer hdrs.
1354 */
1355 NAPI_GRO_CB(p)->flush_id =
1356 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1357 NAPI_GRO_CB(p)->flush |= flush;
1358 }
1359
1360 NAPI_GRO_CB(skb)->flush |= flush;
1361 skb_set_network_header(skb, off);
1362 /* The above will be needed by the transport layer if there is one
1363 * immediately following this IP hdr.
1364 */
1365
1366 /* Note : No need to call skb_gro_postpull_rcsum() here,
1367 * as we already checked checksum over ipv4 header was 0
1368 */
1369 skb_gro_pull(skb, sizeof(*iph));
1370 skb_set_transport_header(skb, skb_gro_offset(skb));
1371
1372 pp = ops->callbacks.gro_receive(head, skb);
1373
1374out_unlock:
1375 rcu_read_unlock();
1376
1377out:
1378 NAPI_GRO_CB(skb)->flush |= flush;
1379
1380 return pp;
1381}
1382
1383static struct sk_buff **ipip_gro_receive(struct sk_buff **head,
1384 struct sk_buff *skb)
1385{
1386 if (NAPI_GRO_CB(skb)->encap_mark) {
1387 NAPI_GRO_CB(skb)->flush = 1;
1388 return NULL;
1389 }
1390
1391 NAPI_GRO_CB(skb)->encap_mark = 1;
1392
1393 return inet_gro_receive(head, skb);
1394}
1395
1396#define SECONDS_PER_DAY 86400
1397
1398/* inet_current_timestamp - Return IP network timestamp
1399 *
1400 * Return milliseconds since midnight in network byte order.
1401 */
1402__be32 inet_current_timestamp(void)
1403{
1404 u32 secs;
1405 u32 msecs;
1406 struct timespec64 ts;
1407
1408 ktime_get_real_ts64(&ts);
1409
1410 /* Get secs since midnight. */
1411 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1412 /* Convert to msecs. */
1413 msecs = secs * MSEC_PER_SEC;
1414 /* Convert nsec to msec. */
1415 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1416
1417 /* Convert to network byte order. */
1418 return htonl(msecs);
1419}
1420EXPORT_SYMBOL(inet_current_timestamp);
1421
1422int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1423{
1424 if (sk->sk_family == AF_INET)
1425 return ip_recv_error(sk, msg, len, addr_len);
1426#if IS_ENABLED(CONFIG_IPV6)
1427 if (sk->sk_family == AF_INET6)
1428 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1429#endif
1430 return -EINVAL;
1431}
1432
1433static int inet_gro_complete(struct sk_buff *skb, int nhoff)
1434{
1435 __be16 newlen = htons(skb->len - nhoff);
1436 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1437 const struct net_offload *ops;
1438 int proto = iph->protocol;
1439 int err = -ENOSYS;
1440
1441 if (skb->encapsulation)
1442 skb_set_inner_network_header(skb, nhoff);
1443
1444 csum_replace2(&iph->check, iph->tot_len, newlen);
1445 iph->tot_len = newlen;
1446
1447 rcu_read_lock();
1448 ops = rcu_dereference(inet_offloads[proto]);
1449 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1450 goto out_unlock;
1451
1452 /* Only need to add sizeof(*iph) to get to the next hdr below
1453 * because any hdr with option will have been flushed in
1454 * inet_gro_receive().
1455 */
1456 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1457
1458out_unlock:
1459 rcu_read_unlock();
1460
1461 return err;
1462}
1463
1464static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1465{
1466 skb->encapsulation = 1;
1467 skb_shinfo(skb)->gso_type |= SKB_GSO_IPIP;
1468 return inet_gro_complete(skb, nhoff);
1469}
1470
1471int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1472 unsigned short type, unsigned char protocol,
1473 struct net *net)
1474{
1475 struct socket *sock;
1476 int rc = sock_create_kern(net, family, type, protocol, &sock);
1477
1478 if (rc == 0) {
1479 *sk = sock->sk;
1480 (*sk)->sk_allocation = GFP_ATOMIC;
1481 /*
1482 * Unhash it so that IP input processing does not even see it,
1483 * we do not wish this socket to see incoming packets.
1484 */
1485 (*sk)->sk_prot->unhash(*sk);
1486 }
1487 return rc;
1488}
1489EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1490
1491u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1492{
1493 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1494}
1495EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1496
1497unsigned long snmp_fold_field(void __percpu *mib, int offt)
1498{
1499 unsigned long res = 0;
1500 int i;
1501
1502 for_each_possible_cpu(i)
1503 res += snmp_get_cpu_field(mib, i, offt);
1504 return res;
1505}
1506EXPORT_SYMBOL_GPL(snmp_fold_field);
1507
1508#if BITS_PER_LONG==32
1509
1510u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1511 size_t syncp_offset)
1512{
1513 void *bhptr;
1514 struct u64_stats_sync *syncp;
1515 u64 v;
1516 unsigned int start;
1517
1518 bhptr = per_cpu_ptr(mib, cpu);
1519 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1520 do {
1521 start = u64_stats_fetch_begin_irq(syncp);
1522 v = *(((u64 *)bhptr) + offt);
1523 } while (u64_stats_fetch_retry_irq(syncp, start));
1524
1525 return v;
1526}
1527EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1528
1529u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1530{
1531 u64 res = 0;
1532 int cpu;
1533
1534 for_each_possible_cpu(cpu) {
1535 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1536 }
1537 return res;
1538}
1539EXPORT_SYMBOL_GPL(snmp_fold_field64);
1540#endif
1541
1542#ifdef CONFIG_IP_MULTICAST
1543static const struct net_protocol igmp_protocol = {
1544 .handler = igmp_rcv,
1545 .netns_ok = 1,
1546};
1547#endif
1548
1549static const struct net_protocol tcp_protocol = {
1550 .early_demux = tcp_v4_early_demux,
1551 .handler = tcp_v4_rcv,
1552 .err_handler = tcp_v4_err,
1553 .no_policy = 1,
1554 .netns_ok = 1,
1555 .icmp_strict_tag_validation = 1,
1556};
1557
1558static const struct net_protocol udp_protocol = {
1559 .early_demux = udp_v4_early_demux,
1560 .handler = udp_rcv,
1561 .err_handler = udp_err,
1562 .no_policy = 1,
1563 .netns_ok = 1,
1564};
1565
1566static const struct net_protocol icmp_protocol = {
1567 .handler = icmp_rcv,
1568 .err_handler = icmp_err,
1569 .no_policy = 1,
1570 .netns_ok = 1,
1571};
1572
1573static __net_init int ipv4_mib_init_net(struct net *net)
1574{
1575 int i;
1576
1577 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1578 if (!net->mib.tcp_statistics)
1579 goto err_tcp_mib;
1580 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1581 if (!net->mib.ip_statistics)
1582 goto err_ip_mib;
1583
1584 for_each_possible_cpu(i) {
1585 struct ipstats_mib *af_inet_stats;
1586 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1587 u64_stats_init(&af_inet_stats->syncp);
1588 }
1589
1590 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1591 if (!net->mib.net_statistics)
1592 goto err_net_mib;
1593 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1594 if (!net->mib.udp_statistics)
1595 goto err_udp_mib;
1596 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1597 if (!net->mib.udplite_statistics)
1598 goto err_udplite_mib;
1599 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1600 if (!net->mib.icmp_statistics)
1601 goto err_icmp_mib;
1602 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1603 GFP_KERNEL);
1604 if (!net->mib.icmpmsg_statistics)
1605 goto err_icmpmsg_mib;
1606
1607 tcp_mib_init(net);
1608 return 0;
1609
1610err_icmpmsg_mib:
1611 free_percpu(net->mib.icmp_statistics);
1612err_icmp_mib:
1613 free_percpu(net->mib.udplite_statistics);
1614err_udplite_mib:
1615 free_percpu(net->mib.udp_statistics);
1616err_udp_mib:
1617 free_percpu(net->mib.net_statistics);
1618err_net_mib:
1619 free_percpu(net->mib.ip_statistics);
1620err_ip_mib:
1621 free_percpu(net->mib.tcp_statistics);
1622err_tcp_mib:
1623 return -ENOMEM;
1624}
1625
1626static __net_exit void ipv4_mib_exit_net(struct net *net)
1627{
1628 kfree(net->mib.icmpmsg_statistics);
1629 free_percpu(net->mib.icmp_statistics);
1630 free_percpu(net->mib.udplite_statistics);
1631 free_percpu(net->mib.udp_statistics);
1632 free_percpu(net->mib.net_statistics);
1633 free_percpu(net->mib.ip_statistics);
1634 free_percpu(net->mib.tcp_statistics);
1635}
1636
1637static __net_initdata struct pernet_operations ipv4_mib_ops = {
1638 .init = ipv4_mib_init_net,
1639 .exit = ipv4_mib_exit_net,
1640};
1641
1642static int __init init_ipv4_mibs(void)
1643{
1644 return register_pernet_subsys(&ipv4_mib_ops);
1645}
1646
1647static __net_init int inet_init_net(struct net *net)
1648{
1649 /*
1650 * Set defaults for local port range
1651 */
1652 seqlock_init(&net->ipv4.ip_local_ports.lock);
1653 net->ipv4.ip_local_ports.range[0] = 32768;
1654 net->ipv4.ip_local_ports.range[1] = 60999;
1655
1656 seqlock_init(&net->ipv4.ping_group_range.lock);
1657 /*
1658 * Sane defaults - nobody may create ping sockets.
1659 * Boot scripts should set this to distro-specific group.
1660 */
1661 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1662 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1663 return 0;
1664}
1665
1666static __net_exit void inet_exit_net(struct net *net)
1667{
1668}
1669
1670static __net_initdata struct pernet_operations af_inet_ops = {
1671 .init = inet_init_net,
1672 .exit = inet_exit_net,
1673};
1674
1675static int __init init_inet_pernet_ops(void)
1676{
1677 return register_pernet_subsys(&af_inet_ops);
1678}
1679
1680static int ipv4_proc_init(void);
1681
1682/*
1683 * IP protocol layer initialiser
1684 */
1685
1686static struct packet_offload ip_packet_offload __read_mostly = {
1687 .type = cpu_to_be16(ETH_P_IP),
1688 .callbacks = {
1689 .gso_segment = inet_gso_segment,
1690 .gro_receive = inet_gro_receive,
1691 .gro_complete = inet_gro_complete,
1692 },
1693};
1694
1695static const struct net_offload ipip_offload = {
1696 .callbacks = {
1697 .gso_segment = inet_gso_segment,
1698 .gro_receive = ipip_gro_receive,
1699 .gro_complete = ipip_gro_complete,
1700 },
1701};
1702
1703static int __init ipv4_offload_init(void)
1704{
1705 /*
1706 * Add offloads
1707 */
1708 if (udpv4_offload_init() < 0)
1709 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1710 if (tcpv4_offload_init() < 0)
1711 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1712
1713 dev_add_offload(&ip_packet_offload);
1714 inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1715 return 0;
1716}
1717
1718fs_initcall(ipv4_offload_init);
1719
1720static struct packet_type ip_packet_type __read_mostly = {
1721 .type = cpu_to_be16(ETH_P_IP),
1722 .func = ip_rcv,
1723};
1724
1725static int __init inet_init(void)
1726{
1727 struct inet_protosw *q;
1728 struct list_head *r;
1729 int rc = -EINVAL;
1730
1731 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1732
1733 rc = proto_register(&tcp_prot, 1);
1734 if (rc)
1735 goto out;
1736
1737 rc = proto_register(&udp_prot, 1);
1738 if (rc)
1739 goto out_unregister_tcp_proto;
1740
1741 rc = proto_register(&raw_prot, 1);
1742 if (rc)
1743 goto out_unregister_udp_proto;
1744
1745 rc = proto_register(&ping_prot, 1);
1746 if (rc)
1747 goto out_unregister_raw_proto;
1748
1749 /*
1750 * Tell SOCKET that we are alive...
1751 */
1752
1753 (void)sock_register(&inet_family_ops);
1754
1755#ifdef CONFIG_SYSCTL
1756 ip_static_sysctl_init();
1757#endif
1758
1759 /*
1760 * Add all the base protocols.
1761 */
1762
1763 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1764 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1765 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1766 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1767 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1768 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1769#ifdef CONFIG_IP_MULTICAST
1770 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1771 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1772#endif
1773
1774 /* Register the socket-side information for inet_create. */
1775 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1776 INIT_LIST_HEAD(r);
1777
1778 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1779 inet_register_protosw(q);
1780
1781 /*
1782 * Set the ARP module up
1783 */
1784
1785 arp_init();
1786
1787 /*
1788 * Set the IP module up
1789 */
1790
1791 ip_init();
1792
1793 tcp_v4_init();
1794
1795 /* Setup TCP slab cache for open requests. */
1796 tcp_init();
1797
1798 /* Setup UDP memory threshold */
1799 udp_init();
1800
1801 /* Add UDP-Lite (RFC 3828) */
1802 udplite4_register();
1803
1804 ping_init();
1805
1806 /*
1807 * Set the ICMP layer up
1808 */
1809
1810 if (icmp_init() < 0)
1811 panic("Failed to create the ICMP control socket.\n");
1812
1813 /*
1814 * Initialise the multicast router
1815 */
1816#if defined(CONFIG_IP_MROUTE)
1817 if (ip_mr_init())
1818 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1819#endif
1820
1821 if (init_inet_pernet_ops())
1822 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
1823 /*
1824 * Initialise per-cpu ipv4 mibs
1825 */
1826
1827 if (init_ipv4_mibs())
1828 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1829
1830 ipv4_proc_init();
1831
1832 ipfrag_init();
1833
1834 dev_add_pack(&ip_packet_type);
1835
1836 ip_tunnel_core_init();
1837
1838 rc = 0;
1839out:
1840 return rc;
1841out_unregister_raw_proto:
1842 proto_unregister(&raw_prot);
1843out_unregister_udp_proto:
1844 proto_unregister(&udp_prot);
1845out_unregister_tcp_proto:
1846 proto_unregister(&tcp_prot);
1847 goto out;
1848}
1849
1850fs_initcall(inet_init);
1851
1852/* ------------------------------------------------------------------------ */
1853
1854#ifdef CONFIG_PROC_FS
1855static int __init ipv4_proc_init(void)
1856{
1857 int rc = 0;
1858
1859 if (raw_proc_init())
1860 goto out_raw;
1861 if (tcp4_proc_init())
1862 goto out_tcp;
1863 if (udp4_proc_init())
1864 goto out_udp;
1865 if (ping_proc_init())
1866 goto out_ping;
1867 if (ip_misc_proc_init())
1868 goto out_misc;
1869out:
1870 return rc;
1871out_misc:
1872 ping_proc_exit();
1873out_ping:
1874 udp4_proc_exit();
1875out_udp:
1876 tcp4_proc_exit();
1877out_tcp:
1878 raw_proc_exit();
1879out_raw:
1880 rc = -ENOMEM;
1881 goto out;
1882}
1883
1884#else /* CONFIG_PROC_FS */
1885static int __init ipv4_proc_init(void)
1886{
1887 return 0;
1888}
1889#endif /* CONFIG_PROC_FS */
1890
1891MODULE_ALIAS_NETPROTO(PF_INET);
1892