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.
6 * PF_INET protocol family socket handler.
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>
13 * Changes (see also sock.c)
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
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
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
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
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.
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.
68 #include <linux/err.h>
69 #include <linux/errno.h>
70 #include <linux/types.h>
71 #include <linux/socket.h>
73 #include <linux/kernel.h>
74 #include <linux/module.h>
75 #include <linux/sched.h>
76 #include <linux/timer.h>
77 #include <linux/string.h>
78 #include <linux/sockios.h>
79 #include <linux/net.h>
80 #include <linux/capability.h>
81 #include <linux/fcntl.h>
83 #include <linux/interrupt.h>
84 #include <linux/stat.h>
85 #include <linux/init.h>
86 #include <linux/poll.h>
87 #include <linux/netfilter_ipv4.h>
88 #include <linux/random.h>
89 #include <linux/slab.h>
91 #include <asm/uaccess.h>
92 #include <asm/system.h>
94 #include <linux/inet.h>
95 #include <linux/igmp.h>
96 #include <linux/inetdevice.h>
97 #include <linux/netdevice.h>
98 #include <net/checksum.h>
100 #include <net/protocol.h>
102 #include <net/route.h>
103 #include <net/ip_fib.h>
104 #include <net/inet_connection_sock.h>
107 #include <net/udplite.h>
108 #include <linux/skbuff.h>
109 #include <net/sock.h>
111 #include <net/icmp.h>
112 #include <net/ipip.h>
113 #include <net/inet_common.h>
114 #include <net/xfrm.h>
115 #include <net/net_namespace.h>
116 #ifdef CONFIG_IP_MROUTE
117 #include <linux/mroute.h>
121 /* The inetsw table contains everything that inet_create needs to
122 * build a new socket.
124 static struct list_head inetsw[SOCK_MAX];
125 static DEFINE_SPINLOCK(inetsw_lock);
127 struct ipv4_config ipv4_config;
128 EXPORT_SYMBOL(ipv4_config);
130 /* New destruction routine */
132 void inet_sock_destruct(struct sock *sk)
134 struct inet_sock *inet = inet_sk(sk);
136 __skb_queue_purge(&sk->sk_receive_queue);
137 __skb_queue_purge(&sk->sk_error_queue);
141 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
142 pr_err("Attempt to release TCP socket in state %d %p\n",
146 if (!sock_flag(sk, SOCK_DEAD)) {
147 pr_err("Attempt to release alive inet socket %p\n", sk);
151 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
152 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
153 WARN_ON(sk->sk_wmem_queued);
154 WARN_ON(sk->sk_forward_alloc);
157 dst_release(sk->sk_dst_cache);
158 sk_refcnt_debug_dec(sk);
160 EXPORT_SYMBOL(inet_sock_destruct);
163 * The routines beyond this point handle the behaviour of an AF_INET
164 * socket object. Mostly it punts to the subprotocols of IP to do
169 * Automatically bind an unbound socket.
172 static int inet_autobind(struct sock *sk)
174 struct inet_sock *inet;
175 /* We may need to bind the socket. */
178 if (!inet->inet_num) {
179 if (sk->sk_prot->get_port(sk, 0)) {
183 inet->inet_sport = htons(inet->inet_num);
190 * Move a socket into listening state.
192 int inet_listen(struct socket *sock, int backlog)
194 struct sock *sk = sock->sk;
195 unsigned char old_state;
201 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
204 old_state = sk->sk_state;
205 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
208 /* Really, if the socket is already in listen state
209 * we can only allow the backlog to be adjusted.
211 if (old_state != TCP_LISTEN) {
212 err = inet_csk_listen_start(sk, backlog);
216 sk->sk_max_ack_backlog = backlog;
223 EXPORT_SYMBOL(inet_listen);
225 u32 inet_ehash_secret __read_mostly;
226 EXPORT_SYMBOL(inet_ehash_secret);
229 * inet_ehash_secret must be set exactly once
230 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock
232 void build_ehash_secret(void)
236 get_random_bytes(&rnd, sizeof(rnd));
238 spin_lock_bh(&inetsw_lock);
239 if (!inet_ehash_secret)
240 inet_ehash_secret = rnd;
241 spin_unlock_bh(&inetsw_lock);
243 EXPORT_SYMBOL(build_ehash_secret);
245 static inline int inet_netns_ok(struct net *net, int protocol)
248 const struct net_protocol *ipprot;
250 if (net_eq(net, &init_net))
253 hash = protocol & (MAX_INET_PROTOS - 1);
254 ipprot = rcu_dereference(inet_protos[hash]);
259 return ipprot->netns_ok;
263 * Create an inet socket.
266 static int inet_create(struct net *net, struct socket *sock, int protocol,
270 struct inet_protosw *answer;
271 struct inet_sock *inet;
272 struct proto *answer_prot;
273 unsigned char answer_flags;
274 char answer_no_check;
275 int try_loading_module = 0;
278 if (unlikely(!inet_ehash_secret))
279 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
280 build_ehash_secret();
282 sock->state = SS_UNCONNECTED;
284 /* Look for the requested type/protocol pair. */
286 err = -ESOCKTNOSUPPORT;
288 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
291 /* Check the non-wild match. */
292 if (protocol == answer->protocol) {
293 if (protocol != IPPROTO_IP)
296 /* Check for the two wild cases. */
297 if (IPPROTO_IP == protocol) {
298 protocol = answer->protocol;
301 if (IPPROTO_IP == answer->protocol)
304 err = -EPROTONOSUPPORT;
308 if (try_loading_module < 2) {
311 * Be more specific, e.g. net-pf-2-proto-132-type-1
312 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
314 if (++try_loading_module == 1)
315 request_module("net-pf-%d-proto-%d-type-%d",
316 PF_INET, protocol, sock->type);
318 * Fall back to generic, e.g. net-pf-2-proto-132
319 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
322 request_module("net-pf-%d-proto-%d",
324 goto lookup_protocol;
330 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
334 if (!inet_netns_ok(net, protocol))
337 sock->ops = answer->ops;
338 answer_prot = answer->prot;
339 answer_no_check = answer->no_check;
340 answer_flags = answer->flags;
343 WARN_ON(answer_prot->slab == NULL);
346 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
351 sk->sk_no_check = answer_no_check;
352 if (INET_PROTOSW_REUSE & answer_flags)
356 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
358 if (SOCK_RAW == sock->type) {
359 inet->inet_num = protocol;
360 if (IPPROTO_RAW == protocol)
364 if (ipv4_config.no_pmtu_disc)
365 inet->pmtudisc = IP_PMTUDISC_DONT;
367 inet->pmtudisc = IP_PMTUDISC_WANT;
371 sock_init_data(sock, sk);
373 sk->sk_destruct = inet_sock_destruct;
374 sk->sk_protocol = protocol;
375 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
382 inet->mc_list = NULL;
384 sk_refcnt_debug_inc(sk);
386 if (inet->inet_num) {
387 /* It assumes that any protocol which allows
388 * the user to assign a number at socket
389 * creation time automatically
392 inet->inet_sport = htons(inet->inet_num);
393 /* Add to protocol hash chains. */
394 sk->sk_prot->hash(sk);
397 if (sk->sk_prot->init) {
398 err = sk->sk_prot->init(sk);
400 sk_common_release(sk);
411 * The peer socket should always be NULL (or else). When we call this
412 * function we are destroying the object and from then on nobody
413 * should refer to it.
415 int inet_release(struct socket *sock)
417 struct sock *sk = sock->sk;
422 /* Applications forget to leave groups before exiting */
423 ip_mc_drop_socket(sk);
425 /* If linger is set, we don't return until the close
426 * is complete. Otherwise we return immediately. The
427 * actually closing is done the same either way.
429 * If the close is due to the process exiting, we never
433 if (sock_flag(sk, SOCK_LINGER) &&
434 !(current->flags & PF_EXITING))
435 timeout = sk->sk_lingertime;
437 sk->sk_prot->close(sk, timeout);
441 EXPORT_SYMBOL(inet_release);
443 /* It is off by default, see below. */
444 int sysctl_ip_nonlocal_bind __read_mostly;
445 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
447 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
449 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
450 struct sock *sk = sock->sk;
451 struct inet_sock *inet = inet_sk(sk);
456 /* If the socket has its own bind function then use it. (RAW) */
457 if (sk->sk_prot->bind) {
458 err = sk->sk_prot->bind(sk, uaddr, addr_len);
462 if (addr_len < sizeof(struct sockaddr_in))
465 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
467 /* Not specified by any standard per-se, however it breaks too
468 * many applications when removed. It is unfortunate since
469 * allowing applications to make a non-local bind solves
470 * several problems with systems using dynamic addressing.
471 * (ie. your servers still start up even if your ISDN link
472 * is temporarily down)
474 err = -EADDRNOTAVAIL;
475 if (!sysctl_ip_nonlocal_bind &&
476 !(inet->freebind || inet->transparent) &&
477 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
478 chk_addr_ret != RTN_LOCAL &&
479 chk_addr_ret != RTN_MULTICAST &&
480 chk_addr_ret != RTN_BROADCAST)
483 snum = ntohs(addr->sin_port);
485 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
488 /* We keep a pair of addresses. rcv_saddr is the one
489 * used by hash lookups, and saddr is used for transmit.
491 * In the BSD API these are the same except where it
492 * would be illegal to use them (multicast/broadcast) in
493 * which case the sending device address is used.
497 /* Check these errors (active socket, double bind). */
499 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
500 goto out_release_sock;
502 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
503 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
504 inet->inet_saddr = 0; /* Use device */
506 /* Make sure we are allowed to bind here. */
507 if (sk->sk_prot->get_port(sk, snum)) {
508 inet->inet_saddr = inet->inet_rcv_saddr = 0;
510 goto out_release_sock;
513 if (inet->inet_rcv_saddr)
514 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
516 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
517 inet->inet_sport = htons(inet->inet_num);
518 inet->inet_daddr = 0;
519 inet->inet_dport = 0;
527 EXPORT_SYMBOL(inet_bind);
529 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
530 int addr_len, int flags)
532 struct sock *sk = sock->sk;
534 if (uaddr->sa_family == AF_UNSPEC)
535 return sk->sk_prot->disconnect(sk, flags);
537 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
539 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
541 EXPORT_SYMBOL(inet_dgram_connect);
543 static long inet_wait_for_connect(struct sock *sk, long timeo)
547 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
549 /* Basic assumption: if someone sets sk->sk_err, he _must_
550 * change state of the socket from TCP_SYN_*.
551 * Connect() does not allow to get error notifications
552 * without closing the socket.
554 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
556 timeo = schedule_timeout(timeo);
558 if (signal_pending(current) || !timeo)
560 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
562 finish_wait(sk->sk_sleep, &wait);
567 * Connect to a remote host. There is regrettably still a little
568 * TCP 'magic' in here.
570 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
571 int addr_len, int flags)
573 struct sock *sk = sock->sk;
579 if (uaddr->sa_family == AF_UNSPEC) {
580 err = sk->sk_prot->disconnect(sk, flags);
581 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
585 switch (sock->state) {
594 /* Fall out of switch with err, set for this state */
598 if (sk->sk_state != TCP_CLOSE)
601 err = sk->sk_prot->connect(sk, uaddr, addr_len);
605 sock->state = SS_CONNECTING;
607 /* Just entered SS_CONNECTING state; the only
608 * difference is that return value in non-blocking
609 * case is EINPROGRESS, rather than EALREADY.
615 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
617 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
618 /* Error code is set above */
619 if (!timeo || !inet_wait_for_connect(sk, timeo))
622 err = sock_intr_errno(timeo);
623 if (signal_pending(current))
627 /* Connection was closed by RST, timeout, ICMP error
628 * or another process disconnected us.
630 if (sk->sk_state == TCP_CLOSE)
633 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
634 * and error was received after socket entered established state.
635 * Hence, it is handled normally after connect() return successfully.
638 sock->state = SS_CONNECTED;
645 err = sock_error(sk) ? : -ECONNABORTED;
646 sock->state = SS_UNCONNECTED;
647 if (sk->sk_prot->disconnect(sk, flags))
648 sock->state = SS_DISCONNECTING;
651 EXPORT_SYMBOL(inet_stream_connect);
654 * Accept a pending connection. The TCP layer now gives BSD semantics.
657 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
659 struct sock *sk1 = sock->sk;
661 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
668 WARN_ON(!((1 << sk2->sk_state) &
669 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
671 sock_graft(sk2, newsock);
673 newsock->state = SS_CONNECTED;
679 EXPORT_SYMBOL(inet_accept);
683 * This does both peername and sockname.
685 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
686 int *uaddr_len, int peer)
688 struct sock *sk = sock->sk;
689 struct inet_sock *inet = inet_sk(sk);
690 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
692 sin->sin_family = AF_INET;
694 if (!inet->inet_dport ||
695 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
698 sin->sin_port = inet->inet_dport;
699 sin->sin_addr.s_addr = inet->inet_daddr;
701 __be32 addr = inet->inet_rcv_saddr;
703 addr = inet->inet_saddr;
704 sin->sin_port = inet->inet_sport;
705 sin->sin_addr.s_addr = addr;
707 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
708 *uaddr_len = sizeof(*sin);
711 EXPORT_SYMBOL(inet_getname);
713 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
716 struct sock *sk = sock->sk;
718 /* We may need to bind the socket. */
719 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
722 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
724 EXPORT_SYMBOL(inet_sendmsg);
727 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
728 size_t size, int flags)
730 struct sock *sk = sock->sk;
732 /* We may need to bind the socket. */
733 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
736 if (sk->sk_prot->sendpage)
737 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
738 return sock_no_sendpage(sock, page, offset, size, flags);
742 int inet_shutdown(struct socket *sock, int how)
744 struct sock *sk = sock->sk;
747 /* This should really check to make sure
748 * the socket is a TCP socket. (WHY AC...)
750 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
753 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
757 if (sock->state == SS_CONNECTING) {
758 if ((1 << sk->sk_state) &
759 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
760 sock->state = SS_DISCONNECTING;
762 sock->state = SS_CONNECTED;
765 switch (sk->sk_state) {
768 /* Hack to wake up other listeners, who can poll for
769 POLLHUP, even on eg. unconnected UDP sockets -- RR */
771 sk->sk_shutdown |= how;
772 if (sk->sk_prot->shutdown)
773 sk->sk_prot->shutdown(sk, how);
776 /* Remaining two branches are temporary solution for missing
777 * close() in multithreaded environment. It is _not_ a good idea,
778 * but we have no choice until close() is repaired at VFS level.
781 if (!(how & RCV_SHUTDOWN))
785 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
786 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
790 /* Wake up anyone sleeping in poll. */
791 sk->sk_state_change(sk);
795 EXPORT_SYMBOL(inet_shutdown);
798 * ioctl() calls you can issue on an INET socket. Most of these are
799 * device configuration and stuff and very rarely used. Some ioctls
800 * pass on to the socket itself.
802 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
803 * loads the devconfigure module does its configuring and unloads it.
804 * There's a good 20K of config code hanging around the kernel.
807 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
809 struct sock *sk = sock->sk;
811 struct net *net = sock_net(sk);
815 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
818 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
823 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
828 err = arp_ioctl(net, cmd, (void __user *)arg);
841 err = devinet_ioctl(net, cmd, (void __user *)arg);
844 if (sk->sk_prot->ioctl)
845 err = sk->sk_prot->ioctl(sk, cmd, arg);
852 EXPORT_SYMBOL(inet_ioctl);
854 const struct proto_ops inet_stream_ops = {
856 .owner = THIS_MODULE,
857 .release = inet_release,
859 .connect = inet_stream_connect,
860 .socketpair = sock_no_socketpair,
861 .accept = inet_accept,
862 .getname = inet_getname,
865 .listen = inet_listen,
866 .shutdown = inet_shutdown,
867 .setsockopt = sock_common_setsockopt,
868 .getsockopt = sock_common_getsockopt,
869 .sendmsg = tcp_sendmsg,
870 .recvmsg = sock_common_recvmsg,
871 .mmap = sock_no_mmap,
872 .sendpage = tcp_sendpage,
873 .splice_read = tcp_splice_read,
875 .compat_setsockopt = compat_sock_common_setsockopt,
876 .compat_getsockopt = compat_sock_common_getsockopt,
879 EXPORT_SYMBOL(inet_stream_ops);
881 const struct proto_ops inet_dgram_ops = {
883 .owner = THIS_MODULE,
884 .release = inet_release,
886 .connect = inet_dgram_connect,
887 .socketpair = sock_no_socketpair,
888 .accept = sock_no_accept,
889 .getname = inet_getname,
892 .listen = sock_no_listen,
893 .shutdown = inet_shutdown,
894 .setsockopt = sock_common_setsockopt,
895 .getsockopt = sock_common_getsockopt,
896 .sendmsg = inet_sendmsg,
897 .recvmsg = sock_common_recvmsg,
898 .mmap = sock_no_mmap,
899 .sendpage = inet_sendpage,
901 .compat_setsockopt = compat_sock_common_setsockopt,
902 .compat_getsockopt = compat_sock_common_getsockopt,
905 EXPORT_SYMBOL(inet_dgram_ops);
908 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
911 static const struct proto_ops inet_sockraw_ops = {
913 .owner = THIS_MODULE,
914 .release = inet_release,
916 .connect = inet_dgram_connect,
917 .socketpair = sock_no_socketpair,
918 .accept = sock_no_accept,
919 .getname = inet_getname,
920 .poll = datagram_poll,
922 .listen = sock_no_listen,
923 .shutdown = inet_shutdown,
924 .setsockopt = sock_common_setsockopt,
925 .getsockopt = sock_common_getsockopt,
926 .sendmsg = inet_sendmsg,
927 .recvmsg = sock_common_recvmsg,
928 .mmap = sock_no_mmap,
929 .sendpage = inet_sendpage,
931 .compat_setsockopt = compat_sock_common_setsockopt,
932 .compat_getsockopt = compat_sock_common_getsockopt,
936 static const struct net_proto_family inet_family_ops = {
938 .create = inet_create,
939 .owner = THIS_MODULE,
942 /* Upon startup we insert all the elements in inetsw_array[] into
943 * the linked list inetsw.
945 static struct inet_protosw inetsw_array[] =
949 .protocol = IPPROTO_TCP,
951 .ops = &inet_stream_ops,
953 .flags = INET_PROTOSW_PERMANENT |
959 .protocol = IPPROTO_UDP,
961 .ops = &inet_dgram_ops,
962 .no_check = UDP_CSUM_DEFAULT,
963 .flags = INET_PROTOSW_PERMANENT,
969 .protocol = IPPROTO_IP, /* wild card */
971 .ops = &inet_sockraw_ops,
972 .no_check = UDP_CSUM_DEFAULT,
973 .flags = INET_PROTOSW_REUSE,
977 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
979 void inet_register_protosw(struct inet_protosw *p)
981 struct list_head *lh;
982 struct inet_protosw *answer;
983 int protocol = p->protocol;
984 struct list_head *last_perm;
986 spin_lock_bh(&inetsw_lock);
988 if (p->type >= SOCK_MAX)
991 /* If we are trying to override a permanent protocol, bail. */
993 last_perm = &inetsw[p->type];
994 list_for_each(lh, &inetsw[p->type]) {
995 answer = list_entry(lh, struct inet_protosw, list);
997 /* Check only the non-wild match. */
998 if (INET_PROTOSW_PERMANENT & answer->flags) {
999 if (protocol == answer->protocol)
1009 /* Add the new entry after the last permanent entry if any, so that
1010 * the new entry does not override a permanent entry when matched with
1011 * a wild-card protocol. But it is allowed to override any existing
1012 * non-permanent entry. This means that when we remove this entry, the
1013 * system automatically returns to the old behavior.
1015 list_add_rcu(&p->list, last_perm);
1017 spin_unlock_bh(&inetsw_lock);
1022 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
1028 "Ignoring attempt to register invalid socket type %d.\n",
1032 EXPORT_SYMBOL(inet_register_protosw);
1034 void inet_unregister_protosw(struct inet_protosw *p)
1036 if (INET_PROTOSW_PERMANENT & p->flags) {
1038 "Attempt to unregister permanent protocol %d.\n",
1041 spin_lock_bh(&inetsw_lock);
1042 list_del_rcu(&p->list);
1043 spin_unlock_bh(&inetsw_lock);
1048 EXPORT_SYMBOL(inet_unregister_protosw);
1051 * Shall we try to damage output packets if routing dev changes?
1054 int sysctl_ip_dynaddr __read_mostly;
1056 static int inet_sk_reselect_saddr(struct sock *sk)
1058 struct inet_sock *inet = inet_sk(sk);
1061 __be32 old_saddr = inet->inet_saddr;
1063 __be32 daddr = inet->inet_daddr;
1065 if (inet->opt && inet->opt->srr)
1066 daddr = inet->opt->faddr;
1068 /* Query new route. */
1069 err = ip_route_connect(&rt, daddr, 0,
1071 sk->sk_bound_dev_if,
1073 inet->inet_sport, inet->inet_dport, sk, 0);
1077 sk_setup_caps(sk, &rt->u.dst);
1079 new_saddr = rt->rt_src;
1081 if (new_saddr == old_saddr)
1084 if (sysctl_ip_dynaddr > 1) {
1085 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n",
1086 __func__, &old_saddr, &new_saddr);
1089 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1092 * XXX The only one ugly spot where we need to
1093 * XXX really change the sockets identity after
1094 * XXX it has entered the hashes. -DaveM
1096 * Besides that, it does not check for connection
1097 * uniqueness. Wait for troubles.
1099 __sk_prot_rehash(sk);
1103 int inet_sk_rebuild_header(struct sock *sk)
1105 struct inet_sock *inet = inet_sk(sk);
1106 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1110 /* Route is OK, nothing to do. */
1115 daddr = inet->inet_daddr;
1116 if (inet->opt && inet->opt->srr)
1117 daddr = inet->opt->faddr;
1120 .oif = sk->sk_bound_dev_if,
1121 .mark = sk->sk_mark,
1125 .saddr = inet->inet_saddr,
1126 .tos = RT_CONN_FLAGS(sk),
1129 .proto = sk->sk_protocol,
1130 .flags = inet_sk_flowi_flags(sk),
1133 .sport = inet->inet_sport,
1134 .dport = inet->inet_dport,
1139 security_sk_classify_flow(sk, &fl);
1140 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
1143 sk_setup_caps(sk, &rt->u.dst);
1145 /* Routing failed... */
1146 sk->sk_route_caps = 0;
1148 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1149 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1151 if (!sysctl_ip_dynaddr ||
1152 sk->sk_state != TCP_SYN_SENT ||
1153 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1154 (err = inet_sk_reselect_saddr(sk)) != 0)
1155 sk->sk_err_soft = -err;
1160 EXPORT_SYMBOL(inet_sk_rebuild_header);
1162 static int inet_gso_send_check(struct sk_buff *skb)
1165 const struct net_protocol *ops;
1170 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1175 if (ihl < sizeof(*iph))
1178 if (unlikely(!pskb_may_pull(skb, ihl)))
1181 __skb_pull(skb, ihl);
1182 skb_reset_transport_header(skb);
1184 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1185 err = -EPROTONOSUPPORT;
1188 ops = rcu_dereference(inet_protos[proto]);
1189 if (likely(ops && ops->gso_send_check))
1190 err = ops->gso_send_check(skb);
1197 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
1199 struct sk_buff *segs = ERR_PTR(-EINVAL);
1201 const struct net_protocol *ops;
1205 unsigned int offset = 0;
1207 if (!(features & NETIF_F_V4_CSUM))
1208 features &= ~NETIF_F_SG;
1210 if (unlikely(skb_shinfo(skb)->gso_type &
1218 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1223 if (ihl < sizeof(*iph))
1226 if (unlikely(!pskb_may_pull(skb, ihl)))
1229 __skb_pull(skb, ihl);
1230 skb_reset_transport_header(skb);
1232 id = ntohs(iph->id);
1233 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1234 segs = ERR_PTR(-EPROTONOSUPPORT);
1237 ops = rcu_dereference(inet_protos[proto]);
1238 if (likely(ops && ops->gso_segment))
1239 segs = ops->gso_segment(skb, features);
1242 if (!segs || IS_ERR(segs))
1248 if (proto == IPPROTO_UDP) {
1249 iph->id = htons(id);
1250 iph->frag_off = htons(offset >> 3);
1251 if (skb->next != NULL)
1252 iph->frag_off |= htons(IP_MF);
1253 offset += (skb->len - skb->mac_len - iph->ihl * 4);
1255 iph->id = htons(id++);
1256 iph->tot_len = htons(skb->len - skb->mac_len);
1258 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
1259 } while ((skb = skb->next));
1265 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1266 struct sk_buff *skb)
1268 const struct net_protocol *ops;
1269 struct sk_buff **pp = NULL;
1278 off = skb_gro_offset(skb);
1279 hlen = off + sizeof(*iph);
1280 iph = skb_gro_header_fast(skb, off);
1281 if (skb_gro_header_hard(skb, hlen)) {
1282 iph = skb_gro_header_slow(skb, hlen, off);
1287 proto = iph->protocol & (MAX_INET_PROTOS - 1);
1290 ops = rcu_dereference(inet_protos[proto]);
1291 if (!ops || !ops->gro_receive)
1294 if (*(u8 *)iph != 0x45)
1297 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1300 id = ntohl(*(u32 *)&iph->id);
1301 flush = (u16)((ntohl(*(u32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
1304 for (p = *head; p; p = p->next) {
1307 if (!NAPI_GRO_CB(p)->same_flow)
1312 if ((iph->protocol ^ iph2->protocol) |
1313 (iph->tos ^ iph2->tos) |
1314 (iph->saddr ^ iph2->saddr) |
1315 (iph->daddr ^ iph2->daddr)) {
1316 NAPI_GRO_CB(p)->same_flow = 0;
1320 /* All fields must match except length and checksum. */
1321 NAPI_GRO_CB(p)->flush |=
1322 (iph->ttl ^ iph2->ttl) |
1323 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1325 NAPI_GRO_CB(p)->flush |= flush;
1328 NAPI_GRO_CB(skb)->flush |= flush;
1329 skb_gro_pull(skb, sizeof(*iph));
1330 skb_set_transport_header(skb, skb_gro_offset(skb));
1332 pp = ops->gro_receive(head, skb);
1338 NAPI_GRO_CB(skb)->flush |= flush;
1343 static int inet_gro_complete(struct sk_buff *skb)
1345 const struct net_protocol *ops;
1346 struct iphdr *iph = ip_hdr(skb);
1347 int proto = iph->protocol & (MAX_INET_PROTOS - 1);
1349 __be16 newlen = htons(skb->len - skb_network_offset(skb));
1351 csum_replace2(&iph->check, iph->tot_len, newlen);
1352 iph->tot_len = newlen;
1355 ops = rcu_dereference(inet_protos[proto]);
1356 if (WARN_ON(!ops || !ops->gro_complete))
1359 err = ops->gro_complete(skb);
1367 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1368 unsigned short type, unsigned char protocol,
1371 struct socket *sock;
1372 int rc = sock_create_kern(family, type, protocol, &sock);
1376 (*sk)->sk_allocation = GFP_ATOMIC;
1378 * Unhash it so that IP input processing does not even see it,
1379 * we do not wish this socket to see incoming packets.
1381 (*sk)->sk_prot->unhash(*sk);
1383 sk_change_net(*sk, net);
1387 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1389 unsigned long snmp_fold_field(void __percpu *mib[], int offt)
1391 unsigned long res = 0;
1394 for_each_possible_cpu(i) {
1395 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
1396 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
1400 EXPORT_SYMBOL_GPL(snmp_fold_field);
1402 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize)
1404 BUG_ON(ptr == NULL);
1405 ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long long));
1408 ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long long));
1413 free_percpu(ptr[0]);
1418 EXPORT_SYMBOL_GPL(snmp_mib_init);
1420 void snmp_mib_free(void __percpu *ptr[2])
1422 BUG_ON(ptr == NULL);
1423 free_percpu(ptr[0]);
1424 free_percpu(ptr[1]);
1425 ptr[0] = ptr[1] = NULL;
1427 EXPORT_SYMBOL_GPL(snmp_mib_free);
1429 #ifdef CONFIG_IP_MULTICAST
1430 static const struct net_protocol igmp_protocol = {
1431 .handler = igmp_rcv,
1436 static const struct net_protocol tcp_protocol = {
1437 .handler = tcp_v4_rcv,
1438 .err_handler = tcp_v4_err,
1439 .gso_send_check = tcp_v4_gso_send_check,
1440 .gso_segment = tcp_tso_segment,
1441 .gro_receive = tcp4_gro_receive,
1442 .gro_complete = tcp4_gro_complete,
1447 static const struct net_protocol udp_protocol = {
1449 .err_handler = udp_err,
1450 .gso_send_check = udp4_ufo_send_check,
1451 .gso_segment = udp4_ufo_fragment,
1456 static const struct net_protocol icmp_protocol = {
1457 .handler = icmp_rcv,
1462 static __net_init int ipv4_mib_init_net(struct net *net)
1464 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics,
1465 sizeof(struct tcp_mib)) < 0)
1467 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics,
1468 sizeof(struct ipstats_mib)) < 0)
1470 if (snmp_mib_init((void __percpu **)net->mib.net_statistics,
1471 sizeof(struct linux_mib)) < 0)
1473 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics,
1474 sizeof(struct udp_mib)) < 0)
1476 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics,
1477 sizeof(struct udp_mib)) < 0)
1478 goto err_udplite_mib;
1479 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics,
1480 sizeof(struct icmp_mib)) < 0)
1482 if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics,
1483 sizeof(struct icmpmsg_mib)) < 0)
1484 goto err_icmpmsg_mib;
1490 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1492 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1494 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1496 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1498 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1500 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
1505 static __net_exit void ipv4_mib_exit_net(struct net *net)
1507 snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics);
1508 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1509 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1510 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1511 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1512 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1513 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
1516 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1517 .init = ipv4_mib_init_net,
1518 .exit = ipv4_mib_exit_net,
1521 static int __init init_ipv4_mibs(void)
1523 return register_pernet_subsys(&ipv4_mib_ops);
1526 static int ipv4_proc_init(void);
1529 * IP protocol layer initialiser
1532 static struct packet_type ip_packet_type __read_mostly = {
1533 .type = cpu_to_be16(ETH_P_IP),
1535 .gso_send_check = inet_gso_send_check,
1536 .gso_segment = inet_gso_segment,
1537 .gro_receive = inet_gro_receive,
1538 .gro_complete = inet_gro_complete,
1541 static int __init inet_init(void)
1543 struct sk_buff *dummy_skb;
1544 struct inet_protosw *q;
1545 struct list_head *r;
1548 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
1550 rc = proto_register(&tcp_prot, 1);
1554 rc = proto_register(&udp_prot, 1);
1556 goto out_unregister_tcp_proto;
1558 rc = proto_register(&raw_prot, 1);
1560 goto out_unregister_udp_proto;
1563 * Tell SOCKET that we are alive...
1566 (void)sock_register(&inet_family_ops);
1568 #ifdef CONFIG_SYSCTL
1569 ip_static_sysctl_init();
1573 * Add all the base protocols.
1576 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1577 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1578 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1579 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1580 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1581 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1582 #ifdef CONFIG_IP_MULTICAST
1583 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1584 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1587 /* Register the socket-side information for inet_create. */
1588 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1591 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1592 inet_register_protosw(q);
1595 * Set the ARP module up
1601 * Set the IP module up
1608 /* Setup TCP slab cache for open requests. */
1611 /* Setup UDP memory threshold */
1614 /* Add UDP-Lite (RFC 3828) */
1615 udplite4_register();
1618 * Set the ICMP layer up
1621 if (icmp_init() < 0)
1622 panic("Failed to create the ICMP control socket.\n");
1625 * Initialise the multicast router
1627 #if defined(CONFIG_IP_MROUTE)
1629 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n");
1632 * Initialise per-cpu ipv4 mibs
1635 if (init_ipv4_mibs())
1636 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n");
1642 dev_add_pack(&ip_packet_type);
1647 out_unregister_udp_proto:
1648 proto_unregister(&udp_prot);
1649 out_unregister_tcp_proto:
1650 proto_unregister(&tcp_prot);
1654 fs_initcall(inet_init);
1656 /* ------------------------------------------------------------------------ */
1658 #ifdef CONFIG_PROC_FS
1659 static int __init ipv4_proc_init(void)
1663 if (raw_proc_init())
1665 if (tcp4_proc_init())
1667 if (udp4_proc_init())
1669 if (ip_misc_proc_init())
1684 #else /* CONFIG_PROC_FS */
1685 static int __init ipv4_proc_init(void)
1689 #endif /* CONFIG_PROC_FS */
1691 MODULE_ALIAS_NETPROTO(PF_INET);