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 #define pr_fmt(fmt) "IPv4: " fmt
70 #include <linux/err.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/capability.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>
90 #include <linux/random.h>
91 #include <linux/slab.h>
93 #include <asm/uaccess.h>
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>
101 #include <net/protocol.h>
103 #include <net/route.h>
104 #include <net/ip_fib.h>
105 #include <net/inet_connection_sock.h>
108 #include <net/udplite.h>
109 #include <net/ping.h>
110 #include <linux/skbuff.h>
111 #include <net/sock.h>
113 #include <net/icmp.h>
114 #include <net/inet_common.h>
115 #include <net/xfrm.h>
116 #include <net/net_namespace.h>
117 #include <net/secure_seq.h>
118 #ifdef CONFIG_IP_MROUTE
119 #include <linux/mroute.h>
123 /* The inetsw table contains everything that inet_create needs to
124 * build a new socket.
126 static struct list_head inetsw[SOCK_MAX];
127 static DEFINE_SPINLOCK(inetsw_lock);
129 struct ipv4_config ipv4_config;
130 EXPORT_SYMBOL(ipv4_config);
132 /* New destruction routine */
134 void inet_sock_destruct(struct sock *sk)
136 struct inet_sock *inet = inet_sk(sk);
138 __skb_queue_purge(&sk->sk_receive_queue);
139 __skb_queue_purge(&sk->sk_error_queue);
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",
148 if (!sock_flag(sk, SOCK_DEAD)) {
149 pr_err("Attempt to release alive inet socket %p\n", sk);
153 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
154 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
155 WARN_ON(sk->sk_wmem_queued);
156 WARN_ON(sk->sk_forward_alloc);
158 kfree(rcu_dereference_protected(inet->inet_opt, 1));
159 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
160 dst_release(sk->sk_rx_dst);
161 sk_refcnt_debug_dec(sk);
163 EXPORT_SYMBOL(inet_sock_destruct);
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
172 * Automatically bind an unbound socket.
175 static int inet_autobind(struct sock *sk)
177 struct inet_sock *inet;
178 /* We may need to bind the socket. */
181 if (!inet->inet_num) {
182 if (sk->sk_prot->get_port(sk, 0)) {
186 inet->inet_sport = htons(inet->inet_num);
193 * Move a socket into listening state.
195 int inet_listen(struct socket *sock, int backlog)
197 struct sock *sk = sock->sk;
198 unsigned char old_state;
204 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
207 old_state = sk->sk_state;
208 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
211 /* Really, if the socket is already in listen state
212 * we can only allow the backlog to be adjusted.
214 if (old_state != TCP_LISTEN) {
215 /* Check special setups for testing purpose to enable TFO w/o
216 * requiring TCP_FASTOPEN sockopt.
217 * Note that only TCP sockets (SOCK_STREAM) will reach here.
218 * Also fastopenq may already been allocated because this
219 * socket was in TCP_LISTEN state previously but was
220 * shutdown() (rather than close()).
222 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 &&
223 inet_csk(sk)->icsk_accept_queue.fastopenq == NULL) {
224 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0)
225 err = fastopen_init_queue(sk, backlog);
226 else if ((sysctl_tcp_fastopen &
227 TFO_SERVER_WO_SOCKOPT2) != 0)
228 err = fastopen_init_queue(sk,
229 ((uint)sysctl_tcp_fastopen) >> 16);
235 err = inet_csk_listen_start(sk, backlog);
239 sk->sk_max_ack_backlog = backlog;
246 EXPORT_SYMBOL(inet_listen);
248 u32 inet_ehash_secret __read_mostly;
249 EXPORT_SYMBOL(inet_ehash_secret);
251 u32 ipv6_hash_secret __read_mostly;
252 EXPORT_SYMBOL(ipv6_hash_secret);
255 * inet_ehash_secret must be set exactly once, and to a non nul value
256 * ipv6_hash_secret must be set exactly once.
258 void build_ehash_secret(void)
263 get_random_bytes(&rnd, sizeof(rnd));
266 if (cmpxchg(&inet_ehash_secret, 0, rnd) == 0)
267 get_random_bytes(&ipv6_hash_secret, sizeof(ipv6_hash_secret));
269 EXPORT_SYMBOL(build_ehash_secret);
272 * Create an inet socket.
275 static int inet_create(struct net *net, struct socket *sock, int protocol,
279 struct inet_protosw *answer;
280 struct inet_sock *inet;
281 struct proto *answer_prot;
282 unsigned char answer_flags;
283 char answer_no_check;
284 int try_loading_module = 0;
287 if (unlikely(!inet_ehash_secret))
288 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
289 build_ehash_secret();
291 sock->state = SS_UNCONNECTED;
293 /* Look for the requested type/protocol pair. */
295 err = -ESOCKTNOSUPPORT;
297 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
300 /* Check the non-wild match. */
301 if (protocol == answer->protocol) {
302 if (protocol != IPPROTO_IP)
305 /* Check for the two wild cases. */
306 if (IPPROTO_IP == protocol) {
307 protocol = answer->protocol;
310 if (IPPROTO_IP == answer->protocol)
313 err = -EPROTONOSUPPORT;
317 if (try_loading_module < 2) {
320 * Be more specific, e.g. net-pf-2-proto-132-type-1
321 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
323 if (++try_loading_module == 1)
324 request_module("net-pf-%d-proto-%d-type-%d",
325 PF_INET, protocol, sock->type);
327 * Fall back to generic, e.g. net-pf-2-proto-132
328 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
331 request_module("net-pf-%d-proto-%d",
333 goto lookup_protocol;
339 if (sock->type == SOCK_RAW && !kern &&
340 !ns_capable(net->user_ns, CAP_NET_RAW))
343 sock->ops = answer->ops;
344 answer_prot = answer->prot;
345 answer_no_check = answer->no_check;
346 answer_flags = answer->flags;
349 WARN_ON(answer_prot->slab == NULL);
352 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
357 sk->sk_no_check = answer_no_check;
358 if (INET_PROTOSW_REUSE & answer_flags)
359 sk->sk_reuse = SK_CAN_REUSE;
362 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
366 if (SOCK_RAW == sock->type) {
367 inet->inet_num = protocol;
368 if (IPPROTO_RAW == protocol)
372 if (ipv4_config.no_pmtu_disc)
373 inet->pmtudisc = IP_PMTUDISC_DONT;
375 inet->pmtudisc = IP_PMTUDISC_WANT;
379 sock_init_data(sock, sk);
381 sk->sk_destruct = inet_sock_destruct;
382 sk->sk_protocol = protocol;
383 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
390 inet->mc_list = NULL;
393 sk_refcnt_debug_inc(sk);
395 if (inet->inet_num) {
396 /* It assumes that any protocol which allows
397 * the user to assign a number at socket
398 * creation time automatically
401 inet->inet_sport = htons(inet->inet_num);
402 /* Add to protocol hash chains. */
403 sk->sk_prot->hash(sk);
406 if (sk->sk_prot->init) {
407 err = sk->sk_prot->init(sk);
409 sk_common_release(sk);
420 * The peer socket should always be NULL (or else). When we call this
421 * function we are destroying the object and from then on nobody
422 * should refer to it.
424 int inet_release(struct socket *sock)
426 struct sock *sk = sock->sk;
431 sock_rps_reset_flow(sk);
433 /* Applications forget to leave groups before exiting */
434 ip_mc_drop_socket(sk);
436 /* If linger is set, we don't return until the close
437 * is complete. Otherwise we return immediately. The
438 * actually closing is done the same either way.
440 * If the close is due to the process exiting, we never
444 if (sock_flag(sk, SOCK_LINGER) &&
445 !(current->flags & PF_EXITING))
446 timeout = sk->sk_lingertime;
448 sk->sk_prot->close(sk, timeout);
452 EXPORT_SYMBOL(inet_release);
454 /* It is off by default, see below. */
455 int sysctl_ip_nonlocal_bind __read_mostly;
456 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
458 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
460 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
461 struct sock *sk = sock->sk;
462 struct inet_sock *inet = inet_sk(sk);
463 struct net *net = sock_net(sk);
468 /* If the socket has its own bind function then use it. (RAW) */
469 if (sk->sk_prot->bind) {
470 err = sk->sk_prot->bind(sk, uaddr, addr_len);
474 if (addr_len < sizeof(struct sockaddr_in))
477 if (addr->sin_family != AF_INET) {
478 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
479 * only if s_addr is INADDR_ANY.
482 if (addr->sin_family != AF_UNSPEC ||
483 addr->sin_addr.s_addr != htonl(INADDR_ANY))
487 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
489 /* Not specified by any standard per-se, however it breaks too
490 * many applications when removed. It is unfortunate since
491 * allowing applications to make a non-local bind solves
492 * several problems with systems using dynamic addressing.
493 * (ie. your servers still start up even if your ISDN link
494 * is temporarily down)
496 err = -EADDRNOTAVAIL;
497 if (!sysctl_ip_nonlocal_bind &&
498 !(inet->freebind || inet->transparent) &&
499 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
500 chk_addr_ret != RTN_LOCAL &&
501 chk_addr_ret != RTN_MULTICAST &&
502 chk_addr_ret != RTN_BROADCAST)
505 snum = ntohs(addr->sin_port);
507 if (snum && snum < PROT_SOCK &&
508 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
511 /* We keep a pair of addresses. rcv_saddr is the one
512 * used by hash lookups, and saddr is used for transmit.
514 * In the BSD API these are the same except where it
515 * would be illegal to use them (multicast/broadcast) in
516 * which case the sending device address is used.
520 /* Check these errors (active socket, double bind). */
522 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
523 goto out_release_sock;
525 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
526 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
527 inet->inet_saddr = 0; /* Use device */
529 /* Make sure we are allowed to bind here. */
530 if (sk->sk_prot->get_port(sk, snum)) {
531 inet->inet_saddr = inet->inet_rcv_saddr = 0;
533 goto out_release_sock;
536 if (inet->inet_rcv_saddr)
537 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
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;
550 EXPORT_SYMBOL(inet_bind);
552 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
553 int addr_len, int flags)
555 struct sock *sk = sock->sk;
557 if (addr_len < sizeof(uaddr->sa_family))
559 if (uaddr->sa_family == AF_UNSPEC)
560 return sk->sk_prot->disconnect(sk, flags);
562 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
564 return sk->sk_prot->connect(sk, uaddr, addr_len);
566 EXPORT_SYMBOL(inet_dgram_connect);
568 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
572 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
573 sk->sk_write_pending += writebias;
575 /* Basic assumption: if someone sets sk->sk_err, he _must_
576 * change state of the socket from TCP_SYN_*.
577 * Connect() does not allow to get error notifications
578 * without closing the socket.
580 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
582 timeo = schedule_timeout(timeo);
584 if (signal_pending(current) || !timeo)
586 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
588 finish_wait(sk_sleep(sk), &wait);
589 sk->sk_write_pending -= writebias;
594 * Connect to a remote host. There is regrettably still a little
595 * TCP 'magic' in here.
597 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
598 int addr_len, int flags)
600 struct sock *sk = sock->sk;
604 if (addr_len < sizeof(uaddr->sa_family))
607 if (uaddr->sa_family == AF_UNSPEC) {
608 err = sk->sk_prot->disconnect(sk, flags);
609 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
613 switch (sock->state) {
622 /* Fall out of switch with err, set for this state */
626 if (sk->sk_state != TCP_CLOSE)
629 err = sk->sk_prot->connect(sk, uaddr, addr_len);
633 sock->state = SS_CONNECTING;
635 /* Just entered SS_CONNECTING state; the only
636 * difference is that return value in non-blocking
637 * case is EINPROGRESS, rather than EALREADY.
643 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
645 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
646 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
647 tcp_sk(sk)->fastopen_req &&
648 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
650 /* Error code is set above */
651 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
654 err = sock_intr_errno(timeo);
655 if (signal_pending(current))
659 /* Connection was closed by RST, timeout, ICMP error
660 * or another process disconnected us.
662 if (sk->sk_state == TCP_CLOSE)
665 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
666 * and error was received after socket entered established state.
667 * Hence, it is handled normally after connect() return successfully.
670 sock->state = SS_CONNECTED;
676 err = sock_error(sk) ? : -ECONNABORTED;
677 sock->state = SS_UNCONNECTED;
678 if (sk->sk_prot->disconnect(sk, flags))
679 sock->state = SS_DISCONNECTING;
682 EXPORT_SYMBOL(__inet_stream_connect);
684 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
685 int addr_len, int flags)
690 err = __inet_stream_connect(sock, uaddr, addr_len, flags);
691 release_sock(sock->sk);
694 EXPORT_SYMBOL(inet_stream_connect);
697 * Accept a pending connection. The TCP layer now gives BSD semantics.
700 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
702 struct sock *sk1 = sock->sk;
704 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
711 sock_rps_record_flow(sk2);
712 WARN_ON(!((1 << sk2->sk_state) &
713 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
714 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
716 sock_graft(sk2, newsock);
718 newsock->state = SS_CONNECTED;
724 EXPORT_SYMBOL(inet_accept);
728 * This does both peername and sockname.
730 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
731 int *uaddr_len, int peer)
733 struct sock *sk = sock->sk;
734 struct inet_sock *inet = inet_sk(sk);
735 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
737 sin->sin_family = AF_INET;
739 if (!inet->inet_dport ||
740 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
743 sin->sin_port = inet->inet_dport;
744 sin->sin_addr.s_addr = inet->inet_daddr;
746 __be32 addr = inet->inet_rcv_saddr;
748 addr = inet->inet_saddr;
749 sin->sin_port = inet->inet_sport;
750 sin->sin_addr.s_addr = addr;
752 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
753 *uaddr_len = sizeof(*sin);
756 EXPORT_SYMBOL(inet_getname);
758 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
761 struct sock *sk = sock->sk;
763 sock_rps_record_flow(sk);
765 /* We may need to bind the socket. */
766 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
770 return sk->sk_prot->sendmsg(iocb, sk, msg, size);
772 EXPORT_SYMBOL(inet_sendmsg);
774 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
775 size_t size, int flags)
777 struct sock *sk = sock->sk;
779 sock_rps_record_flow(sk);
781 /* We may need to bind the socket. */
782 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
786 if (sk->sk_prot->sendpage)
787 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
788 return sock_no_sendpage(sock, page, offset, size, flags);
790 EXPORT_SYMBOL(inet_sendpage);
792 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
793 size_t size, int flags)
795 struct sock *sk = sock->sk;
799 sock_rps_record_flow(sk);
801 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
802 flags & ~MSG_DONTWAIT, &addr_len);
804 msg->msg_namelen = addr_len;
807 EXPORT_SYMBOL(inet_recvmsg);
809 int inet_shutdown(struct socket *sock, int how)
811 struct sock *sk = sock->sk;
814 /* This should really check to make sure
815 * the socket is a TCP socket. (WHY AC...)
817 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
820 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
824 if (sock->state == SS_CONNECTING) {
825 if ((1 << sk->sk_state) &
826 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
827 sock->state = SS_DISCONNECTING;
829 sock->state = SS_CONNECTED;
832 switch (sk->sk_state) {
835 /* Hack to wake up other listeners, who can poll for
836 POLLHUP, even on eg. unconnected UDP sockets -- RR */
838 sk->sk_shutdown |= how;
839 if (sk->sk_prot->shutdown)
840 sk->sk_prot->shutdown(sk, how);
843 /* Remaining two branches are temporary solution for missing
844 * close() in multithreaded environment. It is _not_ a good idea,
845 * but we have no choice until close() is repaired at VFS level.
848 if (!(how & RCV_SHUTDOWN))
852 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
853 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
857 /* Wake up anyone sleeping in poll. */
858 sk->sk_state_change(sk);
862 EXPORT_SYMBOL(inet_shutdown);
865 * ioctl() calls you can issue on an INET socket. Most of these are
866 * device configuration and stuff and very rarely used. Some ioctls
867 * pass on to the socket itself.
869 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
870 * loads the devconfigure module does its configuring and unloads it.
871 * There's a good 20K of config code hanging around the kernel.
874 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
876 struct sock *sk = sock->sk;
878 struct net *net = sock_net(sk);
882 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
885 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
890 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
895 err = arp_ioctl(net, cmd, (void __user *)arg);
908 err = devinet_ioctl(net, cmd, (void __user *)arg);
911 if (sk->sk_prot->ioctl)
912 err = sk->sk_prot->ioctl(sk, cmd, arg);
919 EXPORT_SYMBOL(inet_ioctl);
922 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
924 struct sock *sk = sock->sk;
925 int err = -ENOIOCTLCMD;
927 if (sk->sk_prot->compat_ioctl)
928 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
934 const struct proto_ops inet_stream_ops = {
936 .owner = THIS_MODULE,
937 .release = inet_release,
939 .connect = inet_stream_connect,
940 .socketpair = sock_no_socketpair,
941 .accept = inet_accept,
942 .getname = inet_getname,
945 .listen = inet_listen,
946 .shutdown = inet_shutdown,
947 .setsockopt = sock_common_setsockopt,
948 .getsockopt = sock_common_getsockopt,
949 .sendmsg = inet_sendmsg,
950 .recvmsg = inet_recvmsg,
951 .mmap = sock_no_mmap,
952 .sendpage = inet_sendpage,
953 .splice_read = tcp_splice_read,
955 .compat_setsockopt = compat_sock_common_setsockopt,
956 .compat_getsockopt = compat_sock_common_getsockopt,
957 .compat_ioctl = inet_compat_ioctl,
960 EXPORT_SYMBOL(inet_stream_ops);
962 const struct proto_ops inet_dgram_ops = {
964 .owner = THIS_MODULE,
965 .release = inet_release,
967 .connect = inet_dgram_connect,
968 .socketpair = sock_no_socketpair,
969 .accept = sock_no_accept,
970 .getname = inet_getname,
973 .listen = sock_no_listen,
974 .shutdown = inet_shutdown,
975 .setsockopt = sock_common_setsockopt,
976 .getsockopt = sock_common_getsockopt,
977 .sendmsg = inet_sendmsg,
978 .recvmsg = inet_recvmsg,
979 .mmap = sock_no_mmap,
980 .sendpage = inet_sendpage,
982 .compat_setsockopt = compat_sock_common_setsockopt,
983 .compat_getsockopt = compat_sock_common_getsockopt,
984 .compat_ioctl = inet_compat_ioctl,
987 EXPORT_SYMBOL(inet_dgram_ops);
990 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
993 static const struct proto_ops inet_sockraw_ops = {
995 .owner = THIS_MODULE,
996 .release = inet_release,
998 .connect = inet_dgram_connect,
999 .socketpair = sock_no_socketpair,
1000 .accept = sock_no_accept,
1001 .getname = inet_getname,
1002 .poll = datagram_poll,
1003 .ioctl = inet_ioctl,
1004 .listen = sock_no_listen,
1005 .shutdown = inet_shutdown,
1006 .setsockopt = sock_common_setsockopt,
1007 .getsockopt = sock_common_getsockopt,
1008 .sendmsg = inet_sendmsg,
1009 .recvmsg = inet_recvmsg,
1010 .mmap = sock_no_mmap,
1011 .sendpage = inet_sendpage,
1012 #ifdef CONFIG_COMPAT
1013 .compat_setsockopt = compat_sock_common_setsockopt,
1014 .compat_getsockopt = compat_sock_common_getsockopt,
1015 .compat_ioctl = inet_compat_ioctl,
1019 static const struct net_proto_family inet_family_ops = {
1021 .create = inet_create,
1022 .owner = THIS_MODULE,
1025 /* Upon startup we insert all the elements in inetsw_array[] into
1026 * the linked list inetsw.
1028 static struct inet_protosw inetsw_array[] =
1031 .type = SOCK_STREAM,
1032 .protocol = IPPROTO_TCP,
1034 .ops = &inet_stream_ops,
1036 .flags = INET_PROTOSW_PERMANENT |
1042 .protocol = IPPROTO_UDP,
1044 .ops = &inet_dgram_ops,
1045 .no_check = UDP_CSUM_DEFAULT,
1046 .flags = INET_PROTOSW_PERMANENT,
1051 .protocol = IPPROTO_ICMP,
1053 .ops = &inet_dgram_ops,
1054 .no_check = UDP_CSUM_DEFAULT,
1055 .flags = INET_PROTOSW_REUSE,
1060 .protocol = IPPROTO_IP, /* wild card */
1062 .ops = &inet_sockraw_ops,
1063 .no_check = UDP_CSUM_DEFAULT,
1064 .flags = INET_PROTOSW_REUSE,
1068 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1070 void inet_register_protosw(struct inet_protosw *p)
1072 struct list_head *lh;
1073 struct inet_protosw *answer;
1074 int protocol = p->protocol;
1075 struct list_head *last_perm;
1077 spin_lock_bh(&inetsw_lock);
1079 if (p->type >= SOCK_MAX)
1082 /* If we are trying to override a permanent protocol, bail. */
1084 last_perm = &inetsw[p->type];
1085 list_for_each(lh, &inetsw[p->type]) {
1086 answer = list_entry(lh, struct inet_protosw, list);
1088 /* Check only the non-wild match. */
1089 if (INET_PROTOSW_PERMANENT & answer->flags) {
1090 if (protocol == answer->protocol)
1100 /* Add the new entry after the last permanent entry if any, so that
1101 * the new entry does not override a permanent entry when matched with
1102 * a wild-card protocol. But it is allowed to override any existing
1103 * non-permanent entry. This means that when we remove this entry, the
1104 * system automatically returns to the old behavior.
1106 list_add_rcu(&p->list, last_perm);
1108 spin_unlock_bh(&inetsw_lock);
1113 pr_err("Attempt to override permanent protocol %d\n", protocol);
1117 pr_err("Ignoring attempt to register invalid socket type %d\n",
1121 EXPORT_SYMBOL(inet_register_protosw);
1123 void inet_unregister_protosw(struct inet_protosw *p)
1125 if (INET_PROTOSW_PERMANENT & p->flags) {
1126 pr_err("Attempt to unregister permanent protocol %d\n",
1129 spin_lock_bh(&inetsw_lock);
1130 list_del_rcu(&p->list);
1131 spin_unlock_bh(&inetsw_lock);
1136 EXPORT_SYMBOL(inet_unregister_protosw);
1139 * Shall we try to damage output packets if routing dev changes?
1142 int sysctl_ip_dynaddr __read_mostly;
1144 static int inet_sk_reselect_saddr(struct sock *sk)
1146 struct inet_sock *inet = inet_sk(sk);
1147 __be32 old_saddr = inet->inet_saddr;
1148 __be32 daddr = inet->inet_daddr;
1152 struct ip_options_rcu *inet_opt;
1154 inet_opt = rcu_dereference_protected(inet->inet_opt,
1155 sock_owned_by_user(sk));
1156 if (inet_opt && inet_opt->opt.srr)
1157 daddr = inet_opt->opt.faddr;
1159 /* Query new route. */
1160 fl4 = &inet->cork.fl.u.ip4;
1161 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1162 sk->sk_bound_dev_if, sk->sk_protocol,
1163 inet->inet_sport, inet->inet_dport, sk, false);
1167 sk_setup_caps(sk, &rt->dst);
1169 new_saddr = fl4->saddr;
1171 if (new_saddr == old_saddr)
1174 if (sysctl_ip_dynaddr > 1) {
1175 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1176 __func__, &old_saddr, &new_saddr);
1179 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1182 * XXX The only one ugly spot where we need to
1183 * XXX really change the sockets identity after
1184 * XXX it has entered the hashes. -DaveM
1186 * Besides that, it does not check for connection
1187 * uniqueness. Wait for troubles.
1189 __sk_prot_rehash(sk);
1193 int inet_sk_rebuild_header(struct sock *sk)
1195 struct inet_sock *inet = inet_sk(sk);
1196 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1198 struct ip_options_rcu *inet_opt;
1202 /* Route is OK, nothing to do. */
1208 inet_opt = rcu_dereference(inet->inet_opt);
1209 daddr = inet->inet_daddr;
1210 if (inet_opt && inet_opt->opt.srr)
1211 daddr = inet_opt->opt.faddr;
1213 fl4 = &inet->cork.fl.u.ip4;
1214 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1215 inet->inet_dport, inet->inet_sport,
1216 sk->sk_protocol, RT_CONN_FLAGS(sk),
1217 sk->sk_bound_dev_if);
1220 sk_setup_caps(sk, &rt->dst);
1224 /* Routing failed... */
1225 sk->sk_route_caps = 0;
1227 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1228 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1230 if (!sysctl_ip_dynaddr ||
1231 sk->sk_state != TCP_SYN_SENT ||
1232 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1233 (err = inet_sk_reselect_saddr(sk)) != 0)
1234 sk->sk_err_soft = -err;
1239 EXPORT_SYMBOL(inet_sk_rebuild_header);
1241 static int inet_gso_send_check(struct sk_buff *skb)
1243 const struct net_offload *ops;
1244 const struct iphdr *iph;
1249 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1254 if (ihl < sizeof(*iph))
1257 if (unlikely(!pskb_may_pull(skb, ihl)))
1260 __skb_pull(skb, ihl);
1261 skb_reset_transport_header(skb);
1263 proto = iph->protocol;
1264 err = -EPROTONOSUPPORT;
1267 ops = rcu_dereference(inet_offloads[proto]);
1268 if (likely(ops && ops->callbacks.gso_send_check))
1269 err = ops->callbacks.gso_send_check(skb);
1276 static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1277 netdev_features_t features)
1279 struct sk_buff *segs = ERR_PTR(-EINVAL);
1280 const struct net_offload *ops;
1285 unsigned int offset = 0;
1288 if (unlikely(skb_shinfo(skb)->gso_type &
1295 SKB_GSO_UDP_TUNNEL |
1300 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1305 if (ihl < sizeof(*iph))
1308 if (unlikely(!pskb_may_pull(skb, ihl)))
1311 tunnel = !!skb->encapsulation;
1313 __skb_pull(skb, ihl);
1314 skb_reset_transport_header(skb);
1316 id = ntohs(iph->id);
1317 proto = iph->protocol;
1318 segs = ERR_PTR(-EPROTONOSUPPORT);
1321 ops = rcu_dereference(inet_offloads[proto]);
1322 if (likely(ops && ops->callbacks.gso_segment))
1323 segs = ops->callbacks.gso_segment(skb, features);
1326 if (IS_ERR_OR_NULL(segs))
1332 if (!tunnel && proto == IPPROTO_UDP) {
1333 iph->id = htons(id);
1334 iph->frag_off = htons(offset >> 3);
1335 if (skb->next != NULL)
1336 iph->frag_off |= htons(IP_MF);
1337 offset += (skb->len - skb->mac_len - iph->ihl * 4);
1339 iph->id = htons(id++);
1341 iph->tot_len = htons(skb->len - skb->mac_len);
1343 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
1344 } while ((skb = skb->next));
1350 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1351 struct sk_buff *skb)
1353 const struct net_offload *ops;
1354 struct sk_buff **pp = NULL;
1356 const struct iphdr *iph;
1363 off = skb_gro_offset(skb);
1364 hlen = off + sizeof(*iph);
1365 iph = skb_gro_header_fast(skb, off);
1366 if (skb_gro_header_hard(skb, hlen)) {
1367 iph = skb_gro_header_slow(skb, hlen, off);
1372 proto = iph->protocol;
1375 ops = rcu_dereference(inet_offloads[proto]);
1376 if (!ops || !ops->callbacks.gro_receive)
1379 if (*(u8 *)iph != 0x45)
1382 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1385 id = ntohl(*(__be32 *)&iph->id);
1386 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1389 for (p = *head; p; p = p->next) {
1392 if (!NAPI_GRO_CB(p)->same_flow)
1397 if ((iph->protocol ^ iph2->protocol) |
1398 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1399 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1400 NAPI_GRO_CB(p)->same_flow = 0;
1404 /* All fields must match except length and checksum. */
1405 NAPI_GRO_CB(p)->flush |=
1406 (iph->ttl ^ iph2->ttl) |
1407 (iph->tos ^ iph2->tos) |
1408 (__force int)((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)) |
1409 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1411 NAPI_GRO_CB(p)->flush |= flush;
1414 NAPI_GRO_CB(skb)->flush |= flush;
1415 skb_gro_pull(skb, sizeof(*iph));
1416 skb_set_transport_header(skb, skb_gro_offset(skb));
1418 pp = ops->callbacks.gro_receive(head, skb);
1424 NAPI_GRO_CB(skb)->flush |= flush;
1429 static int inet_gro_complete(struct sk_buff *skb)
1431 __be16 newlen = htons(skb->len - skb_network_offset(skb));
1432 struct iphdr *iph = ip_hdr(skb);
1433 const struct net_offload *ops;
1434 int proto = iph->protocol;
1437 csum_replace2(&iph->check, iph->tot_len, newlen);
1438 iph->tot_len = newlen;
1441 ops = rcu_dereference(inet_offloads[proto]);
1442 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1445 err = ops->callbacks.gro_complete(skb);
1453 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1454 unsigned short type, unsigned char protocol,
1457 struct socket *sock;
1458 int rc = sock_create_kern(family, type, protocol, &sock);
1462 (*sk)->sk_allocation = GFP_ATOMIC;
1464 * Unhash it so that IP input processing does not even see it,
1465 * we do not wish this socket to see incoming packets.
1467 (*sk)->sk_prot->unhash(*sk);
1469 sk_change_net(*sk, net);
1473 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1475 unsigned long snmp_fold_field(void __percpu *mib[], int offt)
1477 unsigned long res = 0;
1480 for_each_possible_cpu(i) {
1481 for (j = 0; j < SNMP_ARRAY_SZ; j++)
1482 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt);
1486 EXPORT_SYMBOL_GPL(snmp_fold_field);
1488 #if BITS_PER_LONG==32
1490 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset)
1495 for_each_possible_cpu(cpu) {
1497 struct u64_stats_sync *syncp;
1501 bhptr = per_cpu_ptr(mib[0], cpu);
1502 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1504 start = u64_stats_fetch_begin_bh(syncp);
1505 v = *(((u64 *) bhptr) + offt);
1506 } while (u64_stats_fetch_retry_bh(syncp, start));
1512 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1515 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align)
1517 BUG_ON(ptr == NULL);
1518 ptr[0] = __alloc_percpu(mibsize, align);
1521 #if SNMP_ARRAY_SZ == 2
1522 ptr[1] = __alloc_percpu(mibsize, align);
1524 free_percpu(ptr[0]);
1531 EXPORT_SYMBOL_GPL(snmp_mib_init);
1533 #ifdef CONFIG_IP_MULTICAST
1534 static const struct net_protocol igmp_protocol = {
1535 .handler = igmp_rcv,
1540 static const struct net_protocol tcp_protocol = {
1541 .early_demux = tcp_v4_early_demux,
1542 .handler = tcp_v4_rcv,
1543 .err_handler = tcp_v4_err,
1548 static const struct net_protocol udp_protocol = {
1550 .err_handler = udp_err,
1555 static const struct net_protocol icmp_protocol = {
1556 .handler = icmp_rcv,
1557 .err_handler = icmp_err,
1562 static __net_init int ipv4_mib_init_net(struct net *net)
1564 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics,
1565 sizeof(struct tcp_mib),
1566 __alignof__(struct tcp_mib)) < 0)
1568 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics,
1569 sizeof(struct ipstats_mib),
1570 __alignof__(struct ipstats_mib)) < 0)
1572 if (snmp_mib_init((void __percpu **)net->mib.net_statistics,
1573 sizeof(struct linux_mib),
1574 __alignof__(struct linux_mib)) < 0)
1576 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics,
1577 sizeof(struct udp_mib),
1578 __alignof__(struct udp_mib)) < 0)
1580 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics,
1581 sizeof(struct udp_mib),
1582 __alignof__(struct udp_mib)) < 0)
1583 goto err_udplite_mib;
1584 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics,
1585 sizeof(struct icmp_mib),
1586 __alignof__(struct icmp_mib)) < 0)
1588 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1590 if (!net->mib.icmpmsg_statistics)
1591 goto err_icmpmsg_mib;
1597 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1599 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1601 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1603 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1605 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1607 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
1612 static __net_exit void ipv4_mib_exit_net(struct net *net)
1614 kfree(net->mib.icmpmsg_statistics);
1615 snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1616 snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1617 snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1618 snmp_mib_free((void __percpu **)net->mib.net_statistics);
1619 snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1620 snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
1623 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1624 .init = ipv4_mib_init_net,
1625 .exit = ipv4_mib_exit_net,
1628 static int __init init_ipv4_mibs(void)
1630 return register_pernet_subsys(&ipv4_mib_ops);
1633 static int ipv4_proc_init(void);
1636 * IP protocol layer initialiser
1639 static struct packet_offload ip_packet_offload __read_mostly = {
1640 .type = cpu_to_be16(ETH_P_IP),
1642 .gso_send_check = inet_gso_send_check,
1643 .gso_segment = inet_gso_segment,
1644 .gro_receive = inet_gro_receive,
1645 .gro_complete = inet_gro_complete,
1649 static int __init ipv4_offload_init(void)
1654 if (udpv4_offload_init() < 0)
1655 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1656 if (tcpv4_offload_init() < 0)
1657 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1659 dev_add_offload(&ip_packet_offload);
1663 fs_initcall(ipv4_offload_init);
1665 static struct packet_type ip_packet_type __read_mostly = {
1666 .type = cpu_to_be16(ETH_P_IP),
1670 static int __init inet_init(void)
1672 struct inet_protosw *q;
1673 struct list_head *r;
1676 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
1678 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1679 if (!sysctl_local_reserved_ports)
1682 rc = proto_register(&tcp_prot, 1);
1684 goto out_free_reserved_ports;
1686 rc = proto_register(&udp_prot, 1);
1688 goto out_unregister_tcp_proto;
1690 rc = proto_register(&raw_prot, 1);
1692 goto out_unregister_udp_proto;
1694 rc = proto_register(&ping_prot, 1);
1696 goto out_unregister_raw_proto;
1699 * Tell SOCKET that we are alive...
1702 (void)sock_register(&inet_family_ops);
1704 #ifdef CONFIG_SYSCTL
1705 ip_static_sysctl_init();
1708 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
1711 * Add all the base protocols.
1714 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1715 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1716 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1717 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1718 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1719 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1720 #ifdef CONFIG_IP_MULTICAST
1721 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1722 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1725 /* Register the socket-side information for inet_create. */
1726 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1729 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1730 inet_register_protosw(q);
1733 * Set the ARP module up
1739 * Set the IP module up
1746 /* Setup TCP slab cache for open requests. */
1749 /* Setup UDP memory threshold */
1752 /* Add UDP-Lite (RFC 3828) */
1753 udplite4_register();
1758 * Set the ICMP layer up
1761 if (icmp_init() < 0)
1762 panic("Failed to create the ICMP control socket.\n");
1765 * Initialise the multicast router
1767 #if defined(CONFIG_IP_MROUTE)
1769 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1772 * Initialise per-cpu ipv4 mibs
1775 if (init_ipv4_mibs())
1776 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1782 dev_add_pack(&ip_packet_type);
1787 out_unregister_raw_proto:
1788 proto_unregister(&raw_prot);
1789 out_unregister_udp_proto:
1790 proto_unregister(&udp_prot);
1791 out_unregister_tcp_proto:
1792 proto_unregister(&tcp_prot);
1793 out_free_reserved_ports:
1794 kfree(sysctl_local_reserved_ports);
1798 fs_initcall(inet_init);
1800 /* ------------------------------------------------------------------------ */
1802 #ifdef CONFIG_PROC_FS
1803 static int __init ipv4_proc_init(void)
1807 if (raw_proc_init())
1809 if (tcp4_proc_init())
1811 if (udp4_proc_init())
1813 if (ping_proc_init())
1815 if (ip_misc_proc_init())
1832 #else /* CONFIG_PROC_FS */
1833 static int __init ipv4_proc_init(void)
1837 #endif /* CONFIG_PROC_FS */
1839 MODULE_ALIAS_NETPROTO(PF_INET);