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.
8 * Version: $Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
15 * Changes (see also sock.c)
18 * Karl Knutson : Socket protocol table
19 * A.N.Kuznetsov : Socket death error in accept().
20 * John Richardson : Fix non blocking error in connect()
21 * so sockets that fail to connect
22 * don't return -EINPROGRESS.
23 * Alan Cox : Asynchronous I/O support
24 * Alan Cox : Keep correct socket pointer on sock
27 * Alan Cox : Semantics of SO_LINGER aren't state
28 * moved to close when you look carefully.
29 * With this fixed and the accept bug fixed
30 * some RPC stuff seems happier.
31 * Niibe Yutaka : 4.4BSD style write async I/O
33 * Tony Gale : Fixed reuse semantics.
34 * Alan Cox : bind() shouldn't abort existing but dead
35 * sockets. Stops FTP netin:.. I hope.
36 * Alan Cox : bind() works correctly for RAW sockets.
37 * Note that FreeBSD at least was broken
38 * in this respect so be careful with
39 * compatibility tests...
40 * Alan Cox : routing cache support
41 * Alan Cox : memzero the socket structure for
43 * Matt Day : nonblock connect error handler
44 * Alan Cox : Allow large numbers of pending sockets
45 * (eg for big web sites), but only if
46 * specifically application requested.
47 * Alan Cox : New buffering throughout IP. Used
49 * Alan Cox : New buffering now used smartly.
50 * Alan Cox : BSD rather than common sense
51 * interpretation of listen.
52 * Germano Caronni : Assorted small races.
53 * Alan Cox : sendmsg/recvmsg basic support.
54 * Alan Cox : Only sendmsg/recvmsg now supported.
55 * Alan Cox : Locked down bind (see security list).
56 * Alan Cox : Loosened bind a little.
57 * Mike McLagan : ADD/DEL DLCI Ioctls
58 * Willy Konynenberg : Transparent proxying support.
59 * David S. Miller : New socket lookup architecture.
60 * Some other random speedups.
61 * Cyrus Durgin : Cleaned up file for kmod hacks.
62 * Andi Kleen : Fix inet_stream_connect TCP race.
64 * This program is free software; you can redistribute it and/or
65 * modify it under the terms of the GNU General Public License
66 * as published by the Free Software Foundation; either version
67 * 2 of the License, or (at your option) any later version.
70 #include <linux/config.h>
71 #include <linux/errno.h>
72 #include <linux/types.h>
73 #include <linux/socket.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/fcntl.h>
84 #include <linux/interrupt.h>
85 #include <linux/stat.h>
86 #include <linux/init.h>
87 #include <linux/poll.h>
88 #include <linux/netfilter_ipv4.h>
90 #include <asm/uaccess.h>
91 #include <asm/system.h>
93 #include <linux/smp_lock.h>
94 #include <linux/inet.h>
95 #include <linux/igmp.h>
96 #include <linux/netdevice.h>
98 #include <net/protocol.h>
100 #include <net/route.h>
101 #include <net/ip_fib.h>
102 #include <net/inet_connection_sock.h>
105 #include <linux/skbuff.h>
106 #include <net/sock.h>
108 #include <net/icmp.h>
109 #include <net/ipip.h>
110 #include <net/inet_common.h>
111 #include <net/xfrm.h>
112 #ifdef CONFIG_IP_MROUTE
113 #include <linux/mroute.h>
116 DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly;
118 extern void ip_mc_drop_socket(struct sock *sk);
120 /* The inetsw table contains everything that inet_create needs to
121 * build a new socket.
123 static struct list_head inetsw[SOCK_MAX];
124 static DEFINE_SPINLOCK(inetsw_lock);
126 /* New destruction routine */
128 void inet_sock_destruct(struct sock *sk)
130 struct inet_sock *inet = inet_sk(sk);
132 __skb_queue_purge(&sk->sk_receive_queue);
133 __skb_queue_purge(&sk->sk_error_queue);
135 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
136 printk("Attempt to release TCP socket in state %d %p\n",
140 if (!sock_flag(sk, SOCK_DEAD)) {
141 printk("Attempt to release alive inet socket %p\n", sk);
145 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
146 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
147 BUG_TRAP(!sk->sk_wmem_queued);
148 BUG_TRAP(!sk->sk_forward_alloc);
151 dst_release(sk->sk_dst_cache);
152 sk_refcnt_debug_dec(sk);
156 * The routines beyond this point handle the behaviour of an AF_INET
157 * socket object. Mostly it punts to the subprotocols of IP to do
162 * Automatically bind an unbound socket.
165 static int inet_autobind(struct sock *sk)
167 struct inet_sock *inet;
168 /* We may need to bind the socket. */
172 if (sk->sk_prot->get_port(sk, 0)) {
176 inet->sport = htons(inet->num);
183 * Move a socket into listening state.
185 int inet_listen(struct socket *sock, int backlog)
187 struct sock *sk = sock->sk;
188 unsigned char old_state;
194 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
197 old_state = sk->sk_state;
198 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
201 /* Really, if the socket is already in listen state
202 * we can only allow the backlog to be adjusted.
204 if (old_state != TCP_LISTEN) {
205 err = inet_csk_listen_start(sk, TCP_SYNQ_HSIZE);
209 sk->sk_max_ack_backlog = backlog;
218 * Create an inet socket.
221 static int inet_create(struct socket *sock, int protocol)
225 struct inet_protosw *answer;
226 struct inet_sock *inet;
227 struct proto *answer_prot;
228 unsigned char answer_flags;
229 char answer_no_check;
230 int try_loading_module = 0;
233 sock->state = SS_UNCONNECTED;
235 /* Look for the requested type/protocol pair. */
238 err = -ESOCKTNOSUPPORT;
240 list_for_each_rcu(p, &inetsw[sock->type]) {
241 answer = list_entry(p, struct inet_protosw, list);
243 /* Check the non-wild match. */
244 if (protocol == answer->protocol) {
245 if (protocol != IPPROTO_IP)
248 /* Check for the two wild cases. */
249 if (IPPROTO_IP == protocol) {
250 protocol = answer->protocol;
253 if (IPPROTO_IP == answer->protocol)
256 err = -EPROTONOSUPPORT;
260 if (unlikely(answer == NULL)) {
261 if (try_loading_module < 2) {
264 * Be more specific, e.g. net-pf-2-proto-132-type-1
265 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
267 if (++try_loading_module == 1)
268 request_module("net-pf-%d-proto-%d-type-%d",
269 PF_INET, protocol, sock->type);
271 * Fall back to generic, e.g. net-pf-2-proto-132
272 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
275 request_module("net-pf-%d-proto-%d",
277 goto lookup_protocol;
283 if (answer->capability > 0 && !capable(answer->capability))
286 sock->ops = answer->ops;
287 answer_prot = answer->prot;
288 answer_no_check = answer->no_check;
289 answer_flags = answer->flags;
292 BUG_TRAP(answer_prot->slab != NULL);
295 sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1);
300 sk->sk_no_check = answer_no_check;
301 if (INET_PROTOSW_REUSE & answer_flags)
306 if (SOCK_RAW == sock->type) {
307 inet->num = protocol;
308 if (IPPROTO_RAW == protocol)
312 if (ipv4_config.no_pmtu_disc)
313 inet->pmtudisc = IP_PMTUDISC_DONT;
315 inet->pmtudisc = IP_PMTUDISC_WANT;
319 sock_init_data(sock, sk);
321 sk->sk_destruct = inet_sock_destruct;
322 sk->sk_family = PF_INET;
323 sk->sk_protocol = protocol;
324 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
330 inet->mc_list = NULL;
332 sk_refcnt_debug_inc(sk);
335 /* It assumes that any protocol which allows
336 * the user to assign a number at socket
337 * creation time automatically
340 inet->sport = htons(inet->num);
341 /* Add to protocol hash chains. */
342 sk->sk_prot->hash(sk);
345 if (sk->sk_prot->init) {
346 err = sk->sk_prot->init(sk);
348 sk_common_release(sk);
359 * The peer socket should always be NULL (or else). When we call this
360 * function we are destroying the object and from then on nobody
361 * should refer to it.
363 int inet_release(struct socket *sock)
365 struct sock *sk = sock->sk;
370 /* Applications forget to leave groups before exiting */
371 ip_mc_drop_socket(sk);
373 /* If linger is set, we don't return until the close
374 * is complete. Otherwise we return immediately. The
375 * actually closing is done the same either way.
377 * If the close is due to the process exiting, we never
381 if (sock_flag(sk, SOCK_LINGER) &&
382 !(current->flags & PF_EXITING))
383 timeout = sk->sk_lingertime;
385 sk->sk_prot->close(sk, timeout);
390 /* It is off by default, see below. */
391 int sysctl_ip_nonlocal_bind;
393 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
395 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
396 struct sock *sk = sock->sk;
397 struct inet_sock *inet = inet_sk(sk);
402 /* If the socket has its own bind function then use it. (RAW) */
403 if (sk->sk_prot->bind) {
404 err = sk->sk_prot->bind(sk, uaddr, addr_len);
408 if (addr_len < sizeof(struct sockaddr_in))
411 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
413 /* Not specified by any standard per-se, however it breaks too
414 * many applications when removed. It is unfortunate since
415 * allowing applications to make a non-local bind solves
416 * several problems with systems using dynamic addressing.
417 * (ie. your servers still start up even if your ISDN link
418 * is temporarily down)
420 err = -EADDRNOTAVAIL;
421 if (!sysctl_ip_nonlocal_bind &&
423 addr->sin_addr.s_addr != INADDR_ANY &&
424 chk_addr_ret != RTN_LOCAL &&
425 chk_addr_ret != RTN_MULTICAST &&
426 chk_addr_ret != RTN_BROADCAST)
429 snum = ntohs(addr->sin_port);
431 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
434 /* We keep a pair of addresses. rcv_saddr is the one
435 * used by hash lookups, and saddr is used for transmit.
437 * In the BSD API these are the same except where it
438 * would be illegal to use them (multicast/broadcast) in
439 * which case the sending device address is used.
443 /* Check these errors (active socket, double bind). */
445 if (sk->sk_state != TCP_CLOSE || inet->num)
446 goto out_release_sock;
448 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
449 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
450 inet->saddr = 0; /* Use device */
452 /* Make sure we are allowed to bind here. */
453 if (sk->sk_prot->get_port(sk, snum)) {
454 inet->saddr = inet->rcv_saddr = 0;
456 goto out_release_sock;
460 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
462 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
463 inet->sport = htons(inet->num);
474 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
475 int addr_len, int flags)
477 struct sock *sk = sock->sk;
479 if (uaddr->sa_family == AF_UNSPEC)
480 return sk->sk_prot->disconnect(sk, flags);
482 if (!inet_sk(sk)->num && inet_autobind(sk))
484 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
487 static long inet_wait_for_connect(struct sock *sk, long timeo)
491 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
493 /* Basic assumption: if someone sets sk->sk_err, he _must_
494 * change state of the socket from TCP_SYN_*.
495 * Connect() does not allow to get error notifications
496 * without closing the socket.
498 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
500 timeo = schedule_timeout(timeo);
502 if (signal_pending(current) || !timeo)
504 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
506 finish_wait(sk->sk_sleep, &wait);
511 * Connect to a remote host. There is regrettably still a little
512 * TCP 'magic' in here.
514 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
515 int addr_len, int flags)
517 struct sock *sk = sock->sk;
523 if (uaddr->sa_family == AF_UNSPEC) {
524 err = sk->sk_prot->disconnect(sk, flags);
525 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
529 switch (sock->state) {
538 /* Fall out of switch with err, set for this state */
542 if (sk->sk_state != TCP_CLOSE)
545 err = sk->sk_prot->connect(sk, uaddr, addr_len);
549 sock->state = SS_CONNECTING;
551 /* Just entered SS_CONNECTING state; the only
552 * difference is that return value in non-blocking
553 * case is EINPROGRESS, rather than EALREADY.
559 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
561 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
562 /* Error code is set above */
563 if (!timeo || !inet_wait_for_connect(sk, timeo))
566 err = sock_intr_errno(timeo);
567 if (signal_pending(current))
571 /* Connection was closed by RST, timeout, ICMP error
572 * or another process disconnected us.
574 if (sk->sk_state == TCP_CLOSE)
577 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
578 * and error was received after socket entered established state.
579 * Hence, it is handled normally after connect() return successfully.
582 sock->state = SS_CONNECTED;
589 err = sock_error(sk) ? : -ECONNABORTED;
590 sock->state = SS_UNCONNECTED;
591 if (sk->sk_prot->disconnect(sk, flags))
592 sock->state = SS_DISCONNECTING;
597 * Accept a pending connection. The TCP layer now gives BSD semantics.
600 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
602 struct sock *sk1 = sock->sk;
604 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
611 BUG_TRAP((1 << sk2->sk_state) &
612 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE));
614 sock_graft(sk2, newsock);
616 newsock->state = SS_CONNECTED;
625 * This does both peername and sockname.
627 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
628 int *uaddr_len, int peer)
630 struct sock *sk = sock->sk;
631 struct inet_sock *inet = inet_sk(sk);
632 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
634 sin->sin_family = AF_INET;
637 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
640 sin->sin_port = inet->dport;
641 sin->sin_addr.s_addr = inet->daddr;
643 __u32 addr = inet->rcv_saddr;
646 sin->sin_port = inet->sport;
647 sin->sin_addr.s_addr = addr;
649 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
650 *uaddr_len = sizeof(*sin);
654 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
657 struct sock *sk = sock->sk;
659 /* We may need to bind the socket. */
660 if (!inet_sk(sk)->num && inet_autobind(sk))
663 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
667 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
669 struct sock *sk = sock->sk;
671 /* We may need to bind the socket. */
672 if (!inet_sk(sk)->num && inet_autobind(sk))
675 if (sk->sk_prot->sendpage)
676 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
677 return sock_no_sendpage(sock, page, offset, size, flags);
681 int inet_shutdown(struct socket *sock, int how)
683 struct sock *sk = sock->sk;
686 /* This should really check to make sure
687 * the socket is a TCP socket. (WHY AC...)
689 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
692 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
696 if (sock->state == SS_CONNECTING) {
697 if ((1 << sk->sk_state) &
698 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
699 sock->state = SS_DISCONNECTING;
701 sock->state = SS_CONNECTED;
704 switch (sk->sk_state) {
707 /* Hack to wake up other listeners, who can poll for
708 POLLHUP, even on eg. unconnected UDP sockets -- RR */
710 sk->sk_shutdown |= how;
711 if (sk->sk_prot->shutdown)
712 sk->sk_prot->shutdown(sk, how);
715 /* Remaining two branches are temporary solution for missing
716 * close() in multithreaded environment. It is _not_ a good idea,
717 * but we have no choice until close() is repaired at VFS level.
720 if (!(how & RCV_SHUTDOWN))
724 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
725 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
729 /* Wake up anyone sleeping in poll. */
730 sk->sk_state_change(sk);
736 * ioctl() calls you can issue on an INET socket. Most of these are
737 * device configuration and stuff and very rarely used. Some ioctls
738 * pass on to the socket itself.
740 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
741 * loads the devconfigure module does its configuring and unloads it.
742 * There's a good 20K of config code hanging around the kernel.
745 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
747 struct sock *sk = sock->sk;
752 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
757 err = ip_rt_ioctl(cmd, (void __user *)arg);
762 err = arp_ioctl(cmd, (void __user *)arg);
775 err = devinet_ioctl(cmd, (void __user *)arg);
778 if (!sk->sk_prot->ioctl ||
779 (err = sk->sk_prot->ioctl(sk, cmd, arg)) ==
781 err = dev_ioctl(cmd, (void __user *)arg);
787 struct proto_ops inet_stream_ops = {
789 .owner = THIS_MODULE,
790 .release = inet_release,
792 .connect = inet_stream_connect,
793 .socketpair = sock_no_socketpair,
794 .accept = inet_accept,
795 .getname = inet_getname,
798 .listen = inet_listen,
799 .shutdown = inet_shutdown,
800 .setsockopt = sock_common_setsockopt,
801 .getsockopt = sock_common_getsockopt,
802 .sendmsg = inet_sendmsg,
803 .recvmsg = sock_common_recvmsg,
804 .mmap = sock_no_mmap,
805 .sendpage = tcp_sendpage
808 struct proto_ops inet_dgram_ops = {
810 .owner = THIS_MODULE,
811 .release = inet_release,
813 .connect = inet_dgram_connect,
814 .socketpair = sock_no_socketpair,
815 .accept = sock_no_accept,
816 .getname = inet_getname,
819 .listen = sock_no_listen,
820 .shutdown = inet_shutdown,
821 .setsockopt = sock_common_setsockopt,
822 .getsockopt = sock_common_getsockopt,
823 .sendmsg = inet_sendmsg,
824 .recvmsg = sock_common_recvmsg,
825 .mmap = sock_no_mmap,
826 .sendpage = inet_sendpage,
830 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
833 static struct proto_ops inet_sockraw_ops = {
835 .owner = THIS_MODULE,
836 .release = inet_release,
838 .connect = inet_dgram_connect,
839 .socketpair = sock_no_socketpair,
840 .accept = sock_no_accept,
841 .getname = inet_getname,
842 .poll = datagram_poll,
844 .listen = sock_no_listen,
845 .shutdown = inet_shutdown,
846 .setsockopt = sock_common_setsockopt,
847 .getsockopt = sock_common_getsockopt,
848 .sendmsg = inet_sendmsg,
849 .recvmsg = sock_common_recvmsg,
850 .mmap = sock_no_mmap,
851 .sendpage = inet_sendpage,
854 static struct net_proto_family inet_family_ops = {
856 .create = inet_create,
857 .owner = THIS_MODULE,
860 /* Upon startup we insert all the elements in inetsw_array[] into
861 * the linked list inetsw.
863 static struct inet_protosw inetsw_array[] =
867 .protocol = IPPROTO_TCP,
869 .ops = &inet_stream_ops,
872 .flags = INET_PROTOSW_PERMANENT,
877 .protocol = IPPROTO_UDP,
879 .ops = &inet_dgram_ops,
881 .no_check = UDP_CSUM_DEFAULT,
882 .flags = INET_PROTOSW_PERMANENT,
888 .protocol = IPPROTO_IP, /* wild card */
890 .ops = &inet_sockraw_ops,
891 .capability = CAP_NET_RAW,
892 .no_check = UDP_CSUM_DEFAULT,
893 .flags = INET_PROTOSW_REUSE,
897 #define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw))
899 void inet_register_protosw(struct inet_protosw *p)
901 struct list_head *lh;
902 struct inet_protosw *answer;
903 int protocol = p->protocol;
904 struct list_head *last_perm;
906 spin_lock_bh(&inetsw_lock);
908 if (p->type >= SOCK_MAX)
911 /* If we are trying to override a permanent protocol, bail. */
913 last_perm = &inetsw[p->type];
914 list_for_each(lh, &inetsw[p->type]) {
915 answer = list_entry(lh, struct inet_protosw, list);
917 /* Check only the non-wild match. */
918 if (INET_PROTOSW_PERMANENT & answer->flags) {
919 if (protocol == answer->protocol)
929 /* Add the new entry after the last permanent entry if any, so that
930 * the new entry does not override a permanent entry when matched with
931 * a wild-card protocol. But it is allowed to override any existing
932 * non-permanent entry. This means that when we remove this entry, the
933 * system automatically returns to the old behavior.
935 list_add_rcu(&p->list, last_perm);
937 spin_unlock_bh(&inetsw_lock);
944 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
950 "Ignoring attempt to register invalid socket type %d.\n",
955 void inet_unregister_protosw(struct inet_protosw *p)
957 if (INET_PROTOSW_PERMANENT & p->flags) {
959 "Attempt to unregister permanent protocol %d.\n",
962 spin_lock_bh(&inetsw_lock);
963 list_del_rcu(&p->list);
964 spin_unlock_bh(&inetsw_lock);
971 * Shall we try to damage output packets if routing dev changes?
974 int sysctl_ip_dynaddr;
976 static int inet_sk_reselect_saddr(struct sock *sk)
978 struct inet_sock *inet = inet_sk(sk);
981 __u32 old_saddr = inet->saddr;
983 __u32 daddr = inet->daddr;
985 if (inet->opt && inet->opt->srr)
986 daddr = inet->opt->faddr;
988 /* Query new route. */
989 err = ip_route_connect(&rt, daddr, 0,
993 inet->sport, inet->dport, sk);
997 sk_setup_caps(sk, &rt->u.dst);
999 new_saddr = rt->rt_src;
1001 if (new_saddr == old_saddr)
1004 if (sysctl_ip_dynaddr > 1) {
1005 printk(KERN_INFO "%s(): shifting inet->"
1006 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n",
1009 NIPQUAD(new_saddr));
1012 inet->saddr = inet->rcv_saddr = new_saddr;
1015 * XXX The only one ugly spot where we need to
1016 * XXX really change the sockets identity after
1017 * XXX it has entered the hashes. -DaveM
1019 * Besides that, it does not check for connection
1020 * uniqueness. Wait for troubles.
1022 __sk_prot_rehash(sk);
1026 int inet_sk_rebuild_header(struct sock *sk)
1028 struct inet_sock *inet = inet_sk(sk);
1029 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1033 /* Route is OK, nothing to do. */
1038 daddr = inet->daddr;
1039 if (inet->opt && inet->opt->srr)
1040 daddr = inet->opt->faddr;
1043 .oif = sk->sk_bound_dev_if,
1047 .saddr = inet->saddr,
1048 .tos = RT_CONN_FLAGS(sk),
1051 .proto = sk->sk_protocol,
1054 .sport = inet->sport,
1055 .dport = inet->dport,
1060 err = ip_route_output_flow(&rt, &fl, sk, 0);
1063 sk_setup_caps(sk, &rt->u.dst);
1065 /* Routing failed... */
1066 sk->sk_route_caps = 0;
1068 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1069 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1071 if (!sysctl_ip_dynaddr ||
1072 sk->sk_state != TCP_SYN_SENT ||
1073 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1074 (err = inet_sk_reselect_saddr(sk)) != 0)
1075 sk->sk_err_soft = -err;
1081 EXPORT_SYMBOL(inet_sk_rebuild_header);
1083 #ifdef CONFIG_IP_MULTICAST
1084 static struct net_protocol igmp_protocol = {
1085 .handler = igmp_rcv,
1089 static struct net_protocol tcp_protocol = {
1090 .handler = tcp_v4_rcv,
1091 .err_handler = tcp_v4_err,
1095 static struct net_protocol udp_protocol = {
1097 .err_handler = udp_err,
1101 static struct net_protocol icmp_protocol = {
1102 .handler = icmp_rcv,
1105 static int __init init_ipv4_mibs(void)
1107 net_statistics[0] = alloc_percpu(struct linux_mib);
1108 net_statistics[1] = alloc_percpu(struct linux_mib);
1109 ip_statistics[0] = alloc_percpu(struct ipstats_mib);
1110 ip_statistics[1] = alloc_percpu(struct ipstats_mib);
1111 icmp_statistics[0] = alloc_percpu(struct icmp_mib);
1112 icmp_statistics[1] = alloc_percpu(struct icmp_mib);
1113 tcp_statistics[0] = alloc_percpu(struct tcp_mib);
1114 tcp_statistics[1] = alloc_percpu(struct tcp_mib);
1115 udp_statistics[0] = alloc_percpu(struct udp_mib);
1116 udp_statistics[1] = alloc_percpu(struct udp_mib);
1118 (net_statistics[0] && net_statistics[1] && ip_statistics[0]
1119 && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1]
1120 && udp_statistics[0] && udp_statistics[1]))
1123 (void) tcp_mib_init();
1128 static int ipv4_proc_init(void);
1131 * IP protocol layer initialiser
1134 static struct packet_type ip_packet_type = {
1135 .type = __constant_htons(ETH_P_IP),
1139 static int __init inet_init(void)
1141 struct sk_buff *dummy_skb;
1142 struct inet_protosw *q;
1143 struct list_head *r;
1146 if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) {
1147 printk(KERN_CRIT "%s: panic\n", __FUNCTION__);
1151 rc = proto_register(&tcp_prot, 1);
1155 rc = proto_register(&udp_prot, 1);
1157 goto out_unregister_tcp_proto;
1159 rc = proto_register(&raw_prot, 1);
1161 goto out_unregister_udp_proto;
1164 * Tell SOCKET that we are alive...
1167 (void)sock_register(&inet_family_ops);
1170 * Add all the base protocols.
1173 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1174 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1175 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1176 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1177 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1178 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1179 #ifdef CONFIG_IP_MULTICAST
1180 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1181 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1184 /* Register the socket-side information for inet_create. */
1185 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1188 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1189 inet_register_protosw(q);
1192 * Set the ARP module up
1198 * Set the IP module up
1203 tcp_v4_init(&inet_family_ops);
1205 /* Setup TCP slab cache for open requests. */
1210 * Set the ICMP layer up
1213 icmp_init(&inet_family_ops);
1216 * Initialise the multicast router
1218 #if defined(CONFIG_IP_MROUTE)
1222 * Initialise per-cpu ipv4 mibs
1225 if(init_ipv4_mibs())
1226 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ;
1232 dev_add_pack(&ip_packet_type);
1237 out_unregister_tcp_proto:
1238 proto_unregister(&tcp_prot);
1239 out_unregister_udp_proto:
1240 proto_unregister(&udp_prot);
1244 module_init(inet_init);
1246 /* ------------------------------------------------------------------------ */
1248 #ifdef CONFIG_PROC_FS
1249 static int __init ipv4_proc_init(void)
1253 if (raw_proc_init())
1255 if (tcp4_proc_init())
1257 if (udp4_proc_init())
1259 if (fib_proc_init())
1261 if (ip_misc_proc_init())
1278 #else /* CONFIG_PROC_FS */
1279 static int __init ipv4_proc_init(void)
1283 #endif /* CONFIG_PROC_FS */
1285 MODULE_ALIAS_NETPROTO(PF_INET);
1287 EXPORT_SYMBOL(inet_accept);
1288 EXPORT_SYMBOL(inet_bind);
1289 EXPORT_SYMBOL(inet_dgram_connect);
1290 EXPORT_SYMBOL(inet_dgram_ops);
1291 EXPORT_SYMBOL(inet_getname);
1292 EXPORT_SYMBOL(inet_ioctl);
1293 EXPORT_SYMBOL(inet_listen);
1294 EXPORT_SYMBOL(inet_register_protosw);
1295 EXPORT_SYMBOL(inet_release);
1296 EXPORT_SYMBOL(inet_sendmsg);
1297 EXPORT_SYMBOL(inet_shutdown);
1298 EXPORT_SYMBOL(inet_sock_destruct);
1299 EXPORT_SYMBOL(inet_stream_connect);
1300 EXPORT_SYMBOL(inet_stream_ops);
1301 EXPORT_SYMBOL(inet_unregister_protosw);
1302 EXPORT_SYMBOL(net_statistics);
1303 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);