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 $
10 * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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/major.h>
77 #include <linux/module.h>
78 #include <linux/sched.h>
79 #include <linux/timer.h>
80 #include <linux/string.h>
81 #include <linux/sockios.h>
82 #include <linux/net.h>
83 #include <linux/fcntl.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>
91 #include <asm/uaccess.h>
92 #include <asm/system.h>
94 #include <linux/smp_lock.h>
95 #include <linux/inet.h>
96 #include <linux/igmp.h>
97 #include <linux/netdevice.h>
99 #include <net/protocol.h>
101 #include <net/route.h>
102 #include <net/ip_fib.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);
118 #ifdef INET_REFCNT_DEBUG
119 atomic_t inet_sock_nr;
122 extern void ip_mc_drop_socket(struct sock *sk);
124 /* The inetsw table contains everything that inet_create needs to
125 * build a new socket.
127 static struct list_head inetsw[SOCK_MAX];
128 static DEFINE_SPINLOCK(inetsw_lock);
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);
139 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
140 printk("Attempt to release TCP socket in state %d %p\n",
144 if (!sock_flag(sk, SOCK_DEAD)) {
145 printk("Attempt to release alive inet socket %p\n", sk);
149 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
150 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
151 BUG_TRAP(!sk->sk_wmem_queued);
152 BUG_TRAP(!sk->sk_forward_alloc);
156 dst_release(sk->sk_dst_cache);
157 #ifdef INET_REFCNT_DEBUG
158 atomic_dec(&inet_sock_nr);
159 printk(KERN_DEBUG "INET socket %p released, %d are still alive\n",
160 sk, atomic_read(&inet_sock_nr));
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
171 * Automatically bind an unbound socket.
174 static int inet_autobind(struct sock *sk)
176 struct inet_sock *inet;
177 /* We may need to bind the socket. */
181 if (sk->sk_prot->get_port(sk, 0)) {
185 inet->sport = htons(inet->num);
192 * Move a socket into listening state.
194 int inet_listen(struct socket *sock, int backlog)
196 struct sock *sk = sock->sk;
197 unsigned char old_state;
203 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
206 old_state = sk->sk_state;
207 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
210 /* Really, if the socket is already in listen state
211 * we can only allow the backlog to be adjusted.
213 if (old_state != TCP_LISTEN) {
214 err = tcp_listen_start(sk);
218 sk->sk_max_ack_backlog = backlog;
227 * Create an inet socket.
230 static int inet_create(struct socket *sock, int protocol)
234 struct inet_protosw *answer;
235 struct inet_sock *inet;
236 struct proto *answer_prot;
237 unsigned char answer_flags;
238 char answer_no_check;
241 sock->state = SS_UNCONNECTED;
243 /* Look for the requested type/protocol pair. */
246 list_for_each_rcu(p, &inetsw[sock->type]) {
247 answer = list_entry(p, struct inet_protosw, list);
249 /* Check the non-wild match. */
250 if (protocol == answer->protocol) {
251 if (protocol != IPPROTO_IP)
254 /* Check for the two wild cases. */
255 if (IPPROTO_IP == protocol) {
256 protocol = answer->protocol;
259 if (IPPROTO_IP == answer->protocol)
265 err = -ESOCKTNOSUPPORT;
269 if (answer->capability > 0 && !capable(answer->capability))
271 err = -EPROTONOSUPPORT;
275 sock->ops = answer->ops;
276 answer_prot = answer->prot;
277 answer_no_check = answer->no_check;
278 answer_flags = answer->flags;
281 BUG_TRAP(answer_prot->slab != NULL);
284 sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1);
289 sk->sk_no_check = answer_no_check;
290 if (INET_PROTOSW_REUSE & answer_flags)
295 if (SOCK_RAW == sock->type) {
296 inet->num = protocol;
297 if (IPPROTO_RAW == protocol)
301 if (ipv4_config.no_pmtu_disc)
302 inet->pmtudisc = IP_PMTUDISC_DONT;
304 inet->pmtudisc = IP_PMTUDISC_WANT;
308 sock_init_data(sock, sk);
310 sk->sk_destruct = inet_sock_destruct;
311 sk->sk_family = PF_INET;
312 sk->sk_protocol = protocol;
313 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
319 inet->mc_list = NULL;
321 #ifdef INET_REFCNT_DEBUG
322 atomic_inc(&inet_sock_nr);
326 /* It assumes that any protocol which allows
327 * the user to assign a number at socket
328 * creation time automatically
331 inet->sport = htons(inet->num);
332 /* Add to protocol hash chains. */
333 sk->sk_prot->hash(sk);
336 if (sk->sk_prot->init) {
337 err = sk->sk_prot->init(sk);
339 sk_common_release(sk);
350 * The peer socket should always be NULL (or else). When we call this
351 * function we are destroying the object and from then on nobody
352 * should refer to it.
354 int inet_release(struct socket *sock)
356 struct sock *sk = sock->sk;
361 /* Applications forget to leave groups before exiting */
362 ip_mc_drop_socket(sk);
364 /* If linger is set, we don't return until the close
365 * is complete. Otherwise we return immediately. The
366 * actually closing is done the same either way.
368 * If the close is due to the process exiting, we never
372 if (sock_flag(sk, SOCK_LINGER) &&
373 !(current->flags & PF_EXITING))
374 timeout = sk->sk_lingertime;
376 sk->sk_prot->close(sk, timeout);
381 /* It is off by default, see below. */
382 int sysctl_ip_nonlocal_bind;
384 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
386 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
387 struct sock *sk = sock->sk;
388 struct inet_sock *inet = inet_sk(sk);
393 /* If the socket has its own bind function then use it. (RAW) */
394 if (sk->sk_prot->bind) {
395 err = sk->sk_prot->bind(sk, uaddr, addr_len);
399 if (addr_len < sizeof(struct sockaddr_in))
402 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
404 /* Not specified by any standard per-se, however it breaks too
405 * many applications when removed. It is unfortunate since
406 * allowing applications to make a non-local bind solves
407 * several problems with systems using dynamic addressing.
408 * (ie. your servers still start up even if your ISDN link
409 * is temporarily down)
411 err = -EADDRNOTAVAIL;
412 if (!sysctl_ip_nonlocal_bind &&
414 addr->sin_addr.s_addr != INADDR_ANY &&
415 chk_addr_ret != RTN_LOCAL &&
416 chk_addr_ret != RTN_MULTICAST &&
417 chk_addr_ret != RTN_BROADCAST)
420 snum = ntohs(addr->sin_port);
422 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
425 /* We keep a pair of addresses. rcv_saddr is the one
426 * used by hash lookups, and saddr is used for transmit.
428 * In the BSD API these are the same except where it
429 * would be illegal to use them (multicast/broadcast) in
430 * which case the sending device address is used.
434 /* Check these errors (active socket, double bind). */
436 if (sk->sk_state != TCP_CLOSE || inet->num)
437 goto out_release_sock;
439 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
440 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
441 inet->saddr = 0; /* Use device */
443 /* Make sure we are allowed to bind here. */
444 if (sk->sk_prot->get_port(sk, snum)) {
445 inet->saddr = inet->rcv_saddr = 0;
447 goto out_release_sock;
451 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
453 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
454 inet->sport = htons(inet->num);
465 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
466 int addr_len, int flags)
468 struct sock *sk = sock->sk;
470 if (uaddr->sa_family == AF_UNSPEC)
471 return sk->sk_prot->disconnect(sk, flags);
473 if (!inet_sk(sk)->num && inet_autobind(sk))
475 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
478 static long inet_wait_for_connect(struct sock *sk, long timeo)
482 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
484 /* Basic assumption: if someone sets sk->sk_err, he _must_
485 * change state of the socket from TCP_SYN_*.
486 * Connect() does not allow to get error notifications
487 * without closing the socket.
489 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
491 timeo = schedule_timeout(timeo);
493 if (signal_pending(current) || !timeo)
495 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
497 finish_wait(sk->sk_sleep, &wait);
502 * Connect to a remote host. There is regrettably still a little
503 * TCP 'magic' in here.
505 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
506 int addr_len, int flags)
508 struct sock *sk = sock->sk;
514 if (uaddr->sa_family == AF_UNSPEC) {
515 err = sk->sk_prot->disconnect(sk, flags);
516 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
520 switch (sock->state) {
529 /* Fall out of switch with err, set for this state */
533 if (sk->sk_state != TCP_CLOSE)
536 err = sk->sk_prot->connect(sk, uaddr, addr_len);
540 sock->state = SS_CONNECTING;
542 /* Just entered SS_CONNECTING state; the only
543 * difference is that return value in non-blocking
544 * case is EINPROGRESS, rather than EALREADY.
550 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
552 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
553 /* Error code is set above */
554 if (!timeo || !inet_wait_for_connect(sk, timeo))
557 err = sock_intr_errno(timeo);
558 if (signal_pending(current))
562 /* Connection was closed by RST, timeout, ICMP error
563 * or another process disconnected us.
565 if (sk->sk_state == TCP_CLOSE)
568 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
569 * and error was received after socket entered established state.
570 * Hence, it is handled normally after connect() return successfully.
573 sock->state = SS_CONNECTED;
580 err = sock_error(sk) ? : -ECONNABORTED;
581 sock->state = SS_UNCONNECTED;
582 if (sk->sk_prot->disconnect(sk, flags))
583 sock->state = SS_DISCONNECTING;
588 * Accept a pending connection. The TCP layer now gives BSD semantics.
591 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
593 struct sock *sk1 = sock->sk;
595 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
602 BUG_TRAP((1 << sk2->sk_state) &
603 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE));
605 sock_graft(sk2, newsock);
607 newsock->state = SS_CONNECTED;
616 * This does both peername and sockname.
618 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
619 int *uaddr_len, int peer)
621 struct sock *sk = sock->sk;
622 struct inet_sock *inet = inet_sk(sk);
623 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
625 sin->sin_family = AF_INET;
628 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
631 sin->sin_port = inet->dport;
632 sin->sin_addr.s_addr = inet->daddr;
634 __u32 addr = inet->rcv_saddr;
637 sin->sin_port = inet->sport;
638 sin->sin_addr.s_addr = addr;
640 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
641 *uaddr_len = sizeof(*sin);
645 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
648 struct sock *sk = sock->sk;
650 /* We may need to bind the socket. */
651 if (!inet_sk(sk)->num && inet_autobind(sk))
654 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
658 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
660 struct sock *sk = sock->sk;
662 /* We may need to bind the socket. */
663 if (!inet_sk(sk)->num && inet_autobind(sk))
666 if (sk->sk_prot->sendpage)
667 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
668 return sock_no_sendpage(sock, page, offset, size, flags);
672 int inet_shutdown(struct socket *sock, int how)
674 struct sock *sk = sock->sk;
677 /* This should really check to make sure
678 * the socket is a TCP socket. (WHY AC...)
680 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
683 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
687 if (sock->state == SS_CONNECTING) {
688 if ((1 << sk->sk_state) &
689 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
690 sock->state = SS_DISCONNECTING;
692 sock->state = SS_CONNECTED;
695 switch (sk->sk_state) {
698 /* Hack to wake up other listeners, who can poll for
699 POLLHUP, even on eg. unconnected UDP sockets -- RR */
701 sk->sk_shutdown |= how;
702 if (sk->sk_prot->shutdown)
703 sk->sk_prot->shutdown(sk, how);
706 /* Remaining two branches are temporary solution for missing
707 * close() in multithreaded environment. It is _not_ a good idea,
708 * but we have no choice until close() is repaired at VFS level.
711 if (!(how & RCV_SHUTDOWN))
715 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
716 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
720 /* Wake up anyone sleeping in poll. */
721 sk->sk_state_change(sk);
727 * ioctl() calls you can issue on an INET socket. Most of these are
728 * device configuration and stuff and very rarely used. Some ioctls
729 * pass on to the socket itself.
731 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
732 * loads the devconfigure module does its configuring and unloads it.
733 * There's a good 20K of config code hanging around the kernel.
736 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
738 struct sock *sk = sock->sk;
743 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
748 err = ip_rt_ioctl(cmd, (void __user *)arg);
753 err = arp_ioctl(cmd, (void __user *)arg);
766 err = devinet_ioctl(cmd, (void __user *)arg);
769 if (!sk->sk_prot->ioctl ||
770 (err = sk->sk_prot->ioctl(sk, cmd, arg)) ==
772 err = dev_ioctl(cmd, (void __user *)arg);
778 struct proto_ops inet_stream_ops = {
780 .owner = THIS_MODULE,
781 .release = inet_release,
783 .connect = inet_stream_connect,
784 .socketpair = sock_no_socketpair,
785 .accept = inet_accept,
786 .getname = inet_getname,
789 .listen = inet_listen,
790 .shutdown = inet_shutdown,
791 .setsockopt = sock_common_setsockopt,
792 .getsockopt = sock_common_getsockopt,
793 .sendmsg = inet_sendmsg,
794 .recvmsg = sock_common_recvmsg,
795 .mmap = sock_no_mmap,
796 .sendpage = tcp_sendpage
799 struct proto_ops inet_dgram_ops = {
801 .owner = THIS_MODULE,
802 .release = inet_release,
804 .connect = inet_dgram_connect,
805 .socketpair = sock_no_socketpair,
806 .accept = sock_no_accept,
807 .getname = inet_getname,
810 .listen = sock_no_listen,
811 .shutdown = inet_shutdown,
812 .setsockopt = sock_common_setsockopt,
813 .getsockopt = sock_common_getsockopt,
814 .sendmsg = inet_sendmsg,
815 .recvmsg = sock_common_recvmsg,
816 .mmap = sock_no_mmap,
817 .sendpage = inet_sendpage,
821 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
824 static struct proto_ops inet_sockraw_ops = {
826 .owner = THIS_MODULE,
827 .release = inet_release,
829 .connect = inet_dgram_connect,
830 .socketpair = sock_no_socketpair,
831 .accept = sock_no_accept,
832 .getname = inet_getname,
833 .poll = datagram_poll,
835 .listen = sock_no_listen,
836 .shutdown = inet_shutdown,
837 .setsockopt = sock_common_setsockopt,
838 .getsockopt = sock_common_getsockopt,
839 .sendmsg = inet_sendmsg,
840 .recvmsg = sock_common_recvmsg,
841 .mmap = sock_no_mmap,
842 .sendpage = inet_sendpage,
845 static struct net_proto_family inet_family_ops = {
847 .create = inet_create,
848 .owner = THIS_MODULE,
852 extern void tcp_init(void);
853 extern void tcp_v4_init(struct net_proto_family *);
855 /* Upon startup we insert all the elements in inetsw_array[] into
856 * the linked list inetsw.
858 static struct inet_protosw inetsw_array[] =
862 .protocol = IPPROTO_TCP,
864 .ops = &inet_stream_ops,
867 .flags = INET_PROTOSW_PERMANENT,
872 .protocol = IPPROTO_UDP,
874 .ops = &inet_dgram_ops,
876 .no_check = UDP_CSUM_DEFAULT,
877 .flags = INET_PROTOSW_PERMANENT,
883 .protocol = IPPROTO_IP, /* wild card */
885 .ops = &inet_sockraw_ops,
886 .capability = CAP_NET_RAW,
887 .no_check = UDP_CSUM_DEFAULT,
888 .flags = INET_PROTOSW_REUSE,
892 #define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw))
894 void inet_register_protosw(struct inet_protosw *p)
896 struct list_head *lh;
897 struct inet_protosw *answer;
898 int protocol = p->protocol;
899 struct list_head *last_perm;
901 spin_lock_bh(&inetsw_lock);
903 if (p->type >= SOCK_MAX)
906 /* If we are trying to override a permanent protocol, bail. */
908 last_perm = &inetsw[p->type];
909 list_for_each(lh, &inetsw[p->type]) {
910 answer = list_entry(lh, struct inet_protosw, list);
912 /* Check only the non-wild match. */
913 if (INET_PROTOSW_PERMANENT & answer->flags) {
914 if (protocol == answer->protocol)
924 /* Add the new entry after the last permanent entry if any, so that
925 * the new entry does not override a permanent entry when matched with
926 * a wild-card protocol. But it is allowed to override any existing
927 * non-permanent entry. This means that when we remove this entry, the
928 * system automatically returns to the old behavior.
930 list_add_rcu(&p->list, last_perm);
932 spin_unlock_bh(&inetsw_lock);
939 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
945 "Ignoring attempt to register invalid socket type %d.\n",
950 void inet_unregister_protosw(struct inet_protosw *p)
952 if (INET_PROTOSW_PERMANENT & p->flags) {
954 "Attempt to unregister permanent protocol %d.\n",
957 spin_lock_bh(&inetsw_lock);
958 list_del_rcu(&p->list);
959 spin_unlock_bh(&inetsw_lock);
965 #ifdef CONFIG_IP_MULTICAST
966 static struct net_protocol igmp_protocol = {
971 static struct net_protocol tcp_protocol = {
972 .handler = tcp_v4_rcv,
973 .err_handler = tcp_v4_err,
977 static struct net_protocol udp_protocol = {
979 .err_handler = udp_err,
983 static struct net_protocol icmp_protocol = {
987 static int __init init_ipv4_mibs(void)
989 net_statistics[0] = alloc_percpu(struct linux_mib);
990 net_statistics[1] = alloc_percpu(struct linux_mib);
991 ip_statistics[0] = alloc_percpu(struct ipstats_mib);
992 ip_statistics[1] = alloc_percpu(struct ipstats_mib);
993 icmp_statistics[0] = alloc_percpu(struct icmp_mib);
994 icmp_statistics[1] = alloc_percpu(struct icmp_mib);
995 tcp_statistics[0] = alloc_percpu(struct tcp_mib);
996 tcp_statistics[1] = alloc_percpu(struct tcp_mib);
997 udp_statistics[0] = alloc_percpu(struct udp_mib);
998 udp_statistics[1] = alloc_percpu(struct udp_mib);
1000 (net_statistics[0] && net_statistics[1] && ip_statistics[0]
1001 && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1]
1002 && udp_statistics[0] && udp_statistics[1]))
1005 (void) tcp_mib_init();
1010 static int ipv4_proc_init(void);
1011 extern void ipfrag_init(void);
1013 static int __init inet_init(void)
1015 struct sk_buff *dummy_skb;
1016 struct inet_protosw *q;
1017 struct list_head *r;
1020 if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) {
1021 printk(KERN_CRIT "%s: panic\n", __FUNCTION__);
1025 rc = proto_register(&tcp_prot, 1);
1029 rc = proto_register(&udp_prot, 1);
1031 goto out_unregister_tcp_proto;
1033 rc = proto_register(&raw_prot, 1);
1035 goto out_unregister_udp_proto;
1038 * Tell SOCKET that we are alive...
1041 (void)sock_register(&inet_family_ops);
1044 * Add all the base protocols.
1047 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1048 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1049 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1050 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1051 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1052 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1053 #ifdef CONFIG_IP_MULTICAST
1054 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1055 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1058 /* Register the socket-side information for inet_create. */
1059 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1062 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1063 inet_register_protosw(q);
1066 * Set the ARP module up
1072 * Set the IP module up
1077 tcp_v4_init(&inet_family_ops);
1079 /* Setup TCP slab cache for open requests. */
1084 * Set the ICMP layer up
1087 icmp_init(&inet_family_ops);
1090 * Initialise the multicast router
1092 #if defined(CONFIG_IP_MROUTE)
1096 * Initialise per-cpu ipv4 mibs
1099 if(init_ipv4_mibs())
1100 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ;
1109 out_unregister_tcp_proto:
1110 proto_unregister(&tcp_prot);
1111 out_unregister_udp_proto:
1112 proto_unregister(&udp_prot);
1116 module_init(inet_init);
1118 /* ------------------------------------------------------------------------ */
1120 #ifdef CONFIG_PROC_FS
1121 extern int fib_proc_init(void);
1122 extern void fib_proc_exit(void);
1123 extern int ip_misc_proc_init(void);
1124 extern int raw_proc_init(void);
1125 extern void raw_proc_exit(void);
1126 extern int tcp4_proc_init(void);
1127 extern void tcp4_proc_exit(void);
1128 extern int udp4_proc_init(void);
1129 extern void udp4_proc_exit(void);
1131 static int __init ipv4_proc_init(void)
1135 if (raw_proc_init())
1137 if (tcp4_proc_init())
1139 if (udp4_proc_init())
1141 if (fib_proc_init())
1143 if (ip_misc_proc_init())
1160 #else /* CONFIG_PROC_FS */
1161 static int __init ipv4_proc_init(void)
1165 #endif /* CONFIG_PROC_FS */
1167 MODULE_ALIAS_NETPROTO(PF_INET);
1169 EXPORT_SYMBOL(inet_accept);
1170 EXPORT_SYMBOL(inet_bind);
1171 EXPORT_SYMBOL(inet_dgram_connect);
1172 EXPORT_SYMBOL(inet_dgram_ops);
1173 EXPORT_SYMBOL(inet_getname);
1174 EXPORT_SYMBOL(inet_ioctl);
1175 EXPORT_SYMBOL(inet_listen);
1176 EXPORT_SYMBOL(inet_register_protosw);
1177 EXPORT_SYMBOL(inet_release);
1178 EXPORT_SYMBOL(inet_sendmsg);
1179 EXPORT_SYMBOL(inet_shutdown);
1180 EXPORT_SYMBOL(inet_sock_destruct);
1181 EXPORT_SYMBOL(inet_stream_connect);
1182 EXPORT_SYMBOL(inet_stream_ops);
1183 EXPORT_SYMBOL(inet_unregister_protosw);
1184 EXPORT_SYMBOL(net_statistics);
1186 #ifdef INET_REFCNT_DEBUG
1187 EXPORT_SYMBOL(inet_sock_nr);