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 /* New destruction routine */
131 void inet_sock_destruct(struct sock *sk)
133 struct inet_sock *inet = inet_sk(sk);
135 __skb_queue_purge(&sk->sk_receive_queue);
136 __skb_queue_purge(&sk->sk_error_queue);
140 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
141 pr_err("Attempt to release TCP socket in state %d %p\n",
145 if (!sock_flag(sk, SOCK_DEAD)) {
146 pr_err("Attempt to release alive inet socket %p\n", sk);
150 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
151 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
152 WARN_ON(sk->sk_wmem_queued);
153 WARN_ON(sk->sk_forward_alloc);
155 kfree(rcu_dereference_protected(inet->inet_opt, 1));
156 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
157 dst_release(sk->sk_rx_dst);
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 /* Check special setups for testing purpose to enable TFO w/o
213 * requiring TCP_FASTOPEN sockopt.
214 * Note that only TCP sockets (SOCK_STREAM) will reach here.
215 * Also fastopenq may already been allocated because this
216 * socket was in TCP_LISTEN state previously but was
217 * shutdown() (rather than close()).
219 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 &&
220 !inet_csk(sk)->icsk_accept_queue.fastopenq) {
221 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0)
222 err = fastopen_init_queue(sk, backlog);
223 else if ((sysctl_tcp_fastopen &
224 TFO_SERVER_WO_SOCKOPT2) != 0)
225 err = fastopen_init_queue(sk,
226 ((uint)sysctl_tcp_fastopen) >> 16);
232 tcp_fastopen_init_key_once(true);
234 err = inet_csk_listen_start(sk, backlog);
238 sk->sk_max_ack_backlog = backlog;
245 EXPORT_SYMBOL(inet_listen);
248 * Create an inet socket.
251 static int inet_create(struct net *net, struct socket *sock, int protocol,
255 struct inet_protosw *answer;
256 struct inet_sock *inet;
257 struct proto *answer_prot;
258 unsigned char answer_flags;
259 int try_loading_module = 0;
262 sock->state = SS_UNCONNECTED;
264 /* Look for the requested type/protocol pair. */
266 err = -ESOCKTNOSUPPORT;
268 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
271 /* Check the non-wild match. */
272 if (protocol == answer->protocol) {
273 if (protocol != IPPROTO_IP)
276 /* Check for the two wild cases. */
277 if (IPPROTO_IP == protocol) {
278 protocol = answer->protocol;
281 if (IPPROTO_IP == answer->protocol)
284 err = -EPROTONOSUPPORT;
288 if (try_loading_module < 2) {
291 * Be more specific, e.g. net-pf-2-proto-132-type-1
292 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
294 if (++try_loading_module == 1)
295 request_module("net-pf-%d-proto-%d-type-%d",
296 PF_INET, protocol, sock->type);
298 * Fall back to generic, e.g. net-pf-2-proto-132
299 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
302 request_module("net-pf-%d-proto-%d",
304 goto lookup_protocol;
310 if (sock->type == SOCK_RAW && !kern &&
311 !ns_capable(net->user_ns, CAP_NET_RAW))
314 sock->ops = answer->ops;
315 answer_prot = answer->prot;
316 answer_flags = answer->flags;
319 WARN_ON(!answer_prot->slab);
322 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
327 if (INET_PROTOSW_REUSE & answer_flags)
328 sk->sk_reuse = SK_CAN_REUSE;
331 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
335 if (SOCK_RAW == sock->type) {
336 inet->inet_num = protocol;
337 if (IPPROTO_RAW == protocol)
341 if (net->ipv4.sysctl_ip_no_pmtu_disc)
342 inet->pmtudisc = IP_PMTUDISC_DONT;
344 inet->pmtudisc = IP_PMTUDISC_WANT;
348 sock_init_data(sock, sk);
350 sk->sk_destruct = inet_sock_destruct;
351 sk->sk_protocol = protocol;
352 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
359 inet->mc_list = NULL;
362 sk_refcnt_debug_inc(sk);
364 if (inet->inet_num) {
365 /* It assumes that any protocol which allows
366 * the user to assign a number at socket
367 * creation time automatically
370 inet->inet_sport = htons(inet->inet_num);
371 /* Add to protocol hash chains. */
372 sk->sk_prot->hash(sk);
375 if (sk->sk_prot->init) {
376 err = sk->sk_prot->init(sk);
378 sk_common_release(sk);
389 * The peer socket should always be NULL (or else). When we call this
390 * function we are destroying the object and from then on nobody
391 * should refer to it.
393 int inet_release(struct socket *sock)
395 struct sock *sk = sock->sk;
400 /* Applications forget to leave groups before exiting */
401 ip_mc_drop_socket(sk);
403 /* If linger is set, we don't return until the close
404 * is complete. Otherwise we return immediately. The
405 * actually closing is done the same either way.
407 * If the close is due to the process exiting, we never
411 if (sock_flag(sk, SOCK_LINGER) &&
412 !(current->flags & PF_EXITING))
413 timeout = sk->sk_lingertime;
415 sk->sk_prot->close(sk, timeout);
419 EXPORT_SYMBOL(inet_release);
421 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
423 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
424 struct sock *sk = sock->sk;
425 struct inet_sock *inet = inet_sk(sk);
426 struct net *net = sock_net(sk);
431 /* If the socket has its own bind function then use it. (RAW) */
432 if (sk->sk_prot->bind) {
433 err = sk->sk_prot->bind(sk, uaddr, addr_len);
437 if (addr_len < sizeof(struct sockaddr_in))
440 if (addr->sin_family != AF_INET) {
441 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
442 * only if s_addr is INADDR_ANY.
445 if (addr->sin_family != AF_UNSPEC ||
446 addr->sin_addr.s_addr != htonl(INADDR_ANY))
450 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
452 /* Not specified by any standard per-se, however it breaks too
453 * many applications when removed. It is unfortunate since
454 * allowing applications to make a non-local bind solves
455 * several problems with systems using dynamic addressing.
456 * (ie. your servers still start up even if your ISDN link
457 * is temporarily down)
459 err = -EADDRNOTAVAIL;
460 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
461 !(inet->freebind || inet->transparent) &&
462 addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
463 chk_addr_ret != RTN_LOCAL &&
464 chk_addr_ret != RTN_MULTICAST &&
465 chk_addr_ret != RTN_BROADCAST)
468 snum = ntohs(addr->sin_port);
470 if (snum && snum < PROT_SOCK &&
471 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
474 /* We keep a pair of addresses. rcv_saddr is the one
475 * used by hash lookups, and saddr is used for transmit.
477 * In the BSD API these are the same except where it
478 * would be illegal to use them (multicast/broadcast) in
479 * which case the sending device address is used.
483 /* Check these errors (active socket, double bind). */
485 if (sk->sk_state != TCP_CLOSE || inet->inet_num)
486 goto out_release_sock;
488 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
489 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
490 inet->inet_saddr = 0; /* Use device */
492 /* Make sure we are allowed to bind here. */
493 if (sk->sk_prot->get_port(sk, snum)) {
494 inet->inet_saddr = inet->inet_rcv_saddr = 0;
496 goto out_release_sock;
499 if (inet->inet_rcv_saddr)
500 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
502 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
503 inet->inet_sport = htons(inet->inet_num);
504 inet->inet_daddr = 0;
505 inet->inet_dport = 0;
513 EXPORT_SYMBOL(inet_bind);
515 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
516 int addr_len, int flags)
518 struct sock *sk = sock->sk;
520 if (addr_len < sizeof(uaddr->sa_family))
522 if (uaddr->sa_family == AF_UNSPEC)
523 return sk->sk_prot->disconnect(sk, flags);
525 if (!inet_sk(sk)->inet_num && inet_autobind(sk))
527 return sk->sk_prot->connect(sk, uaddr, addr_len);
529 EXPORT_SYMBOL(inet_dgram_connect);
531 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
535 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
536 sk->sk_write_pending += writebias;
538 /* Basic assumption: if someone sets sk->sk_err, he _must_
539 * change state of the socket from TCP_SYN_*.
540 * Connect() does not allow to get error notifications
541 * without closing the socket.
543 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
545 timeo = schedule_timeout(timeo);
547 if (signal_pending(current) || !timeo)
549 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
551 finish_wait(sk_sleep(sk), &wait);
552 sk->sk_write_pending -= writebias;
557 * Connect to a remote host. There is regrettably still a little
558 * TCP 'magic' in here.
560 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
561 int addr_len, int flags)
563 struct sock *sk = sock->sk;
567 if (addr_len < sizeof(uaddr->sa_family))
570 if (uaddr->sa_family == AF_UNSPEC) {
571 err = sk->sk_prot->disconnect(sk, flags);
572 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
576 switch (sock->state) {
585 /* Fall out of switch with err, set for this state */
589 if (sk->sk_state != TCP_CLOSE)
592 err = sk->sk_prot->connect(sk, uaddr, addr_len);
596 sock->state = SS_CONNECTING;
598 /* Just entered SS_CONNECTING state; the only
599 * difference is that return value in non-blocking
600 * case is EINPROGRESS, rather than EALREADY.
606 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
608 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
609 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
610 tcp_sk(sk)->fastopen_req &&
611 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
613 /* Error code is set above */
614 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
617 err = sock_intr_errno(timeo);
618 if (signal_pending(current))
622 /* Connection was closed by RST, timeout, ICMP error
623 * or another process disconnected us.
625 if (sk->sk_state == TCP_CLOSE)
628 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
629 * and error was received after socket entered established state.
630 * Hence, it is handled normally after connect() return successfully.
633 sock->state = SS_CONNECTED;
639 err = sock_error(sk) ? : -ECONNABORTED;
640 sock->state = SS_UNCONNECTED;
641 if (sk->sk_prot->disconnect(sk, flags))
642 sock->state = SS_DISCONNECTING;
645 EXPORT_SYMBOL(__inet_stream_connect);
647 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
648 int addr_len, int flags)
653 err = __inet_stream_connect(sock, uaddr, addr_len, flags);
654 release_sock(sock->sk);
657 EXPORT_SYMBOL(inet_stream_connect);
660 * Accept a pending connection. The TCP layer now gives BSD semantics.
663 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
665 struct sock *sk1 = sock->sk;
667 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
674 sock_rps_record_flow(sk2);
675 WARN_ON(!((1 << sk2->sk_state) &
676 (TCPF_ESTABLISHED | TCPF_SYN_RECV |
677 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
679 sock_graft(sk2, newsock);
681 newsock->state = SS_CONNECTED;
687 EXPORT_SYMBOL(inet_accept);
691 * This does both peername and sockname.
693 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
694 int *uaddr_len, int peer)
696 struct sock *sk = sock->sk;
697 struct inet_sock *inet = inet_sk(sk);
698 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
700 sin->sin_family = AF_INET;
702 if (!inet->inet_dport ||
703 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
706 sin->sin_port = inet->inet_dport;
707 sin->sin_addr.s_addr = inet->inet_daddr;
709 __be32 addr = inet->inet_rcv_saddr;
711 addr = inet->inet_saddr;
712 sin->sin_port = inet->inet_sport;
713 sin->sin_addr.s_addr = addr;
715 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
716 *uaddr_len = sizeof(*sin);
719 EXPORT_SYMBOL(inet_getname);
721 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
723 struct sock *sk = sock->sk;
725 sock_rps_record_flow(sk);
727 /* We may need to bind the socket. */
728 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
732 return sk->sk_prot->sendmsg(sk, msg, size);
734 EXPORT_SYMBOL(inet_sendmsg);
736 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
737 size_t size, int flags)
739 struct sock *sk = sock->sk;
741 sock_rps_record_flow(sk);
743 /* We may need to bind the socket. */
744 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
748 if (sk->sk_prot->sendpage)
749 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
750 return sock_no_sendpage(sock, page, offset, size, flags);
752 EXPORT_SYMBOL(inet_sendpage);
754 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
757 struct sock *sk = sock->sk;
761 sock_rps_record_flow(sk);
763 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
764 flags & ~MSG_DONTWAIT, &addr_len);
766 msg->msg_namelen = addr_len;
769 EXPORT_SYMBOL(inet_recvmsg);
771 int inet_shutdown(struct socket *sock, int how)
773 struct sock *sk = sock->sk;
776 /* This should really check to make sure
777 * the socket is a TCP socket. (WHY AC...)
779 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
782 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
786 if (sock->state == SS_CONNECTING) {
787 if ((1 << sk->sk_state) &
788 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
789 sock->state = SS_DISCONNECTING;
791 sock->state = SS_CONNECTED;
794 switch (sk->sk_state) {
797 /* Hack to wake up other listeners, who can poll for
798 POLLHUP, even on eg. unconnected UDP sockets -- RR */
800 sk->sk_shutdown |= how;
801 if (sk->sk_prot->shutdown)
802 sk->sk_prot->shutdown(sk, how);
805 /* Remaining two branches are temporary solution for missing
806 * close() in multithreaded environment. It is _not_ a good idea,
807 * but we have no choice until close() is repaired at VFS level.
810 if (!(how & RCV_SHUTDOWN))
814 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
815 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
819 /* Wake up anyone sleeping in poll. */
820 sk->sk_state_change(sk);
824 EXPORT_SYMBOL(inet_shutdown);
827 * ioctl() calls you can issue on an INET socket. Most of these are
828 * device configuration and stuff and very rarely used. Some ioctls
829 * pass on to the socket itself.
831 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
832 * loads the devconfigure module does its configuring and unloads it.
833 * There's a good 20K of config code hanging around the kernel.
836 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
838 struct sock *sk = sock->sk;
840 struct net *net = sock_net(sk);
844 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
847 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
852 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
857 err = arp_ioctl(net, cmd, (void __user *)arg);
870 err = devinet_ioctl(net, cmd, (void __user *)arg);
873 if (sk->sk_prot->ioctl)
874 err = sk->sk_prot->ioctl(sk, cmd, arg);
881 EXPORT_SYMBOL(inet_ioctl);
884 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
886 struct sock *sk = sock->sk;
887 int err = -ENOIOCTLCMD;
889 if (sk->sk_prot->compat_ioctl)
890 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
896 const struct proto_ops inet_stream_ops = {
898 .owner = THIS_MODULE,
899 .release = inet_release,
901 .connect = inet_stream_connect,
902 .socketpair = sock_no_socketpair,
903 .accept = inet_accept,
904 .getname = inet_getname,
907 .listen = inet_listen,
908 .shutdown = inet_shutdown,
909 .setsockopt = sock_common_setsockopt,
910 .getsockopt = sock_common_getsockopt,
911 .sendmsg = inet_sendmsg,
912 .recvmsg = inet_recvmsg,
913 .mmap = sock_no_mmap,
914 .sendpage = inet_sendpage,
915 .splice_read = tcp_splice_read,
917 .compat_setsockopt = compat_sock_common_setsockopt,
918 .compat_getsockopt = compat_sock_common_getsockopt,
919 .compat_ioctl = inet_compat_ioctl,
922 EXPORT_SYMBOL(inet_stream_ops);
924 const struct proto_ops inet_dgram_ops = {
926 .owner = THIS_MODULE,
927 .release = inet_release,
929 .connect = inet_dgram_connect,
930 .socketpair = sock_no_socketpair,
931 .accept = sock_no_accept,
932 .getname = inet_getname,
935 .listen = sock_no_listen,
936 .shutdown = inet_shutdown,
937 .setsockopt = sock_common_setsockopt,
938 .getsockopt = sock_common_getsockopt,
939 .sendmsg = inet_sendmsg,
940 .recvmsg = inet_recvmsg,
941 .mmap = sock_no_mmap,
942 .sendpage = inet_sendpage,
944 .compat_setsockopt = compat_sock_common_setsockopt,
945 .compat_getsockopt = compat_sock_common_getsockopt,
946 .compat_ioctl = inet_compat_ioctl,
949 EXPORT_SYMBOL(inet_dgram_ops);
952 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
955 static const struct proto_ops inet_sockraw_ops = {
957 .owner = THIS_MODULE,
958 .release = inet_release,
960 .connect = inet_dgram_connect,
961 .socketpair = sock_no_socketpair,
962 .accept = sock_no_accept,
963 .getname = inet_getname,
964 .poll = datagram_poll,
966 .listen = sock_no_listen,
967 .shutdown = inet_shutdown,
968 .setsockopt = sock_common_setsockopt,
969 .getsockopt = sock_common_getsockopt,
970 .sendmsg = inet_sendmsg,
971 .recvmsg = inet_recvmsg,
972 .mmap = sock_no_mmap,
973 .sendpage = inet_sendpage,
975 .compat_setsockopt = compat_sock_common_setsockopt,
976 .compat_getsockopt = compat_sock_common_getsockopt,
977 .compat_ioctl = inet_compat_ioctl,
981 static const struct net_proto_family inet_family_ops = {
983 .create = inet_create,
984 .owner = THIS_MODULE,
987 /* Upon startup we insert all the elements in inetsw_array[] into
988 * the linked list inetsw.
990 static struct inet_protosw inetsw_array[] =
994 .protocol = IPPROTO_TCP,
996 .ops = &inet_stream_ops,
997 .flags = INET_PROTOSW_PERMANENT |
1003 .protocol = IPPROTO_UDP,
1005 .ops = &inet_dgram_ops,
1006 .flags = INET_PROTOSW_PERMANENT,
1011 .protocol = IPPROTO_ICMP,
1013 .ops = &inet_dgram_ops,
1014 .flags = INET_PROTOSW_REUSE,
1019 .protocol = IPPROTO_IP, /* wild card */
1021 .ops = &inet_sockraw_ops,
1022 .flags = INET_PROTOSW_REUSE,
1026 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1028 void inet_register_protosw(struct inet_protosw *p)
1030 struct list_head *lh;
1031 struct inet_protosw *answer;
1032 int protocol = p->protocol;
1033 struct list_head *last_perm;
1035 spin_lock_bh(&inetsw_lock);
1037 if (p->type >= SOCK_MAX)
1040 /* If we are trying to override a permanent protocol, bail. */
1042 last_perm = &inetsw[p->type];
1043 list_for_each(lh, &inetsw[p->type]) {
1044 answer = list_entry(lh, struct inet_protosw, list);
1046 /* Check only the non-wild match. */
1047 if (INET_PROTOSW_PERMANENT & answer->flags) {
1048 if (protocol == answer->protocol)
1058 /* Add the new entry after the last permanent entry if any, so that
1059 * the new entry does not override a permanent entry when matched with
1060 * a wild-card protocol. But it is allowed to override any existing
1061 * non-permanent entry. This means that when we remove this entry, the
1062 * system automatically returns to the old behavior.
1064 list_add_rcu(&p->list, last_perm);
1066 spin_unlock_bh(&inetsw_lock);
1071 pr_err("Attempt to override permanent protocol %d\n", protocol);
1075 pr_err("Ignoring attempt to register invalid socket type %d\n",
1079 EXPORT_SYMBOL(inet_register_protosw);
1081 void inet_unregister_protosw(struct inet_protosw *p)
1083 if (INET_PROTOSW_PERMANENT & p->flags) {
1084 pr_err("Attempt to unregister permanent protocol %d\n",
1087 spin_lock_bh(&inetsw_lock);
1088 list_del_rcu(&p->list);
1089 spin_unlock_bh(&inetsw_lock);
1094 EXPORT_SYMBOL(inet_unregister_protosw);
1097 * Shall we try to damage output packets if routing dev changes?
1100 int sysctl_ip_dynaddr __read_mostly;
1102 static int inet_sk_reselect_saddr(struct sock *sk)
1104 struct inet_sock *inet = inet_sk(sk);
1105 __be32 old_saddr = inet->inet_saddr;
1106 __be32 daddr = inet->inet_daddr;
1110 struct ip_options_rcu *inet_opt;
1112 inet_opt = rcu_dereference_protected(inet->inet_opt,
1113 sock_owned_by_user(sk));
1114 if (inet_opt && inet_opt->opt.srr)
1115 daddr = inet_opt->opt.faddr;
1117 /* Query new route. */
1118 fl4 = &inet->cork.fl.u.ip4;
1119 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1120 sk->sk_bound_dev_if, sk->sk_protocol,
1121 inet->inet_sport, inet->inet_dport, sk);
1125 sk_setup_caps(sk, &rt->dst);
1127 new_saddr = fl4->saddr;
1129 if (new_saddr == old_saddr)
1132 if (sysctl_ip_dynaddr > 1) {
1133 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1134 __func__, &old_saddr, &new_saddr);
1137 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1140 * XXX The only one ugly spot where we need to
1141 * XXX really change the sockets identity after
1142 * XXX it has entered the hashes. -DaveM
1144 * Besides that, it does not check for connection
1145 * uniqueness. Wait for troubles.
1147 __sk_prot_rehash(sk);
1151 int inet_sk_rebuild_header(struct sock *sk)
1153 struct inet_sock *inet = inet_sk(sk);
1154 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1156 struct ip_options_rcu *inet_opt;
1160 /* Route is OK, nothing to do. */
1166 inet_opt = rcu_dereference(inet->inet_opt);
1167 daddr = inet->inet_daddr;
1168 if (inet_opt && inet_opt->opt.srr)
1169 daddr = inet_opt->opt.faddr;
1171 fl4 = &inet->cork.fl.u.ip4;
1172 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1173 inet->inet_dport, inet->inet_sport,
1174 sk->sk_protocol, RT_CONN_FLAGS(sk),
1175 sk->sk_bound_dev_if);
1178 sk_setup_caps(sk, &rt->dst);
1182 /* Routing failed... */
1183 sk->sk_route_caps = 0;
1185 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1186 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1188 if (!sysctl_ip_dynaddr ||
1189 sk->sk_state != TCP_SYN_SENT ||
1190 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1191 (err = inet_sk_reselect_saddr(sk)) != 0)
1192 sk->sk_err_soft = -err;
1197 EXPORT_SYMBOL(inet_sk_rebuild_header);
1199 static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1200 netdev_features_t features)
1202 struct sk_buff *segs = ERR_PTR(-EINVAL);
1203 const struct net_offload *ops;
1204 unsigned int offset = 0;
1205 bool udpfrag, encap;
1212 if (unlikely(skb_shinfo(skb)->gso_type &
1222 SKB_GSO_UDP_TUNNEL |
1223 SKB_GSO_UDP_TUNNEL_CSUM |
1224 SKB_GSO_TUNNEL_REMCSUM |
1228 skb_reset_network_header(skb);
1229 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1230 if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1235 if (ihl < sizeof(*iph))
1238 id = ntohs(iph->id);
1239 proto = iph->protocol;
1241 /* Warning: after this point, iph might be no longer valid */
1242 if (unlikely(!pskb_may_pull(skb, ihl)))
1244 __skb_pull(skb, ihl);
1246 encap = SKB_GSO_CB(skb)->encap_level > 0;
1248 features &= skb->dev->hw_enc_features;
1249 SKB_GSO_CB(skb)->encap_level += ihl;
1251 skb_reset_transport_header(skb);
1253 segs = ERR_PTR(-EPROTONOSUPPORT);
1255 if (skb->encapsulation &&
1256 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP))
1257 udpfrag = proto == IPPROTO_UDP && encap;
1259 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation;
1261 ops = rcu_dereference(inet_offloads[proto]);
1262 if (likely(ops && ops->callbacks.gso_segment))
1263 segs = ops->callbacks.gso_segment(skb, features);
1265 if (IS_ERR_OR_NULL(segs))
1270 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1272 iph->id = htons(id);
1273 iph->frag_off = htons(offset >> 3);
1275 iph->frag_off |= htons(IP_MF);
1276 offset += skb->len - nhoff - ihl;
1278 iph->id = htons(id++);
1280 iph->tot_len = htons(skb->len - nhoff);
1283 skb_reset_inner_headers(skb);
1284 skb->network_header = (u8 *)iph - skb->head;
1285 } while ((skb = skb->next));
1291 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1292 struct sk_buff *skb)
1294 const struct net_offload *ops;
1295 struct sk_buff **pp = NULL;
1297 const struct iphdr *iph;
1304 off = skb_gro_offset(skb);
1305 hlen = off + sizeof(*iph);
1306 iph = skb_gro_header_fast(skb, off);
1307 if (skb_gro_header_hard(skb, hlen)) {
1308 iph = skb_gro_header_slow(skb, hlen, off);
1313 proto = iph->protocol;
1316 ops = rcu_dereference(inet_offloads[proto]);
1317 if (!ops || !ops->callbacks.gro_receive)
1320 if (*(u8 *)iph != 0x45)
1323 if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1326 id = ntohl(*(__be32 *)&iph->id);
1327 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1330 for (p = *head; p; p = p->next) {
1333 if (!NAPI_GRO_CB(p)->same_flow)
1336 iph2 = (struct iphdr *)(p->data + off);
1337 /* The above works because, with the exception of the top
1338 * (inner most) layer, we only aggregate pkts with the same
1339 * hdr length so all the hdrs we'll need to verify will start
1340 * at the same offset.
1342 if ((iph->protocol ^ iph2->protocol) |
1343 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1344 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1345 NAPI_GRO_CB(p)->same_flow = 0;
1349 /* All fields must match except length and checksum. */
1350 NAPI_GRO_CB(p)->flush |=
1351 (iph->ttl ^ iph2->ttl) |
1352 (iph->tos ^ iph2->tos) |
1353 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1355 /* Save the IP ID check to be included later when we get to
1356 * the transport layer so only the inner most IP ID is checked.
1357 * This is because some GSO/TSO implementations do not
1358 * correctly increment the IP ID for the outer hdrs.
1360 NAPI_GRO_CB(p)->flush_id =
1361 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1362 NAPI_GRO_CB(p)->flush |= flush;
1365 NAPI_GRO_CB(skb)->flush |= flush;
1366 skb_set_network_header(skb, off);
1367 /* The above will be needed by the transport layer if there is one
1368 * immediately following this IP hdr.
1371 /* Note : No need to call skb_gro_postpull_rcsum() here,
1372 * as we already checked checksum over ipv4 header was 0
1374 skb_gro_pull(skb, sizeof(*iph));
1375 skb_set_transport_header(skb, skb_gro_offset(skb));
1377 pp = ops->callbacks.gro_receive(head, skb);
1383 NAPI_GRO_CB(skb)->flush |= flush;
1388 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1390 if (sk->sk_family == AF_INET)
1391 return ip_recv_error(sk, msg, len, addr_len);
1392 #if IS_ENABLED(CONFIG_IPV6)
1393 if (sk->sk_family == AF_INET6)
1394 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1399 static int inet_gro_complete(struct sk_buff *skb, int nhoff)
1401 __be16 newlen = htons(skb->len - nhoff);
1402 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1403 const struct net_offload *ops;
1404 int proto = iph->protocol;
1407 if (skb->encapsulation)
1408 skb_set_inner_network_header(skb, nhoff);
1410 csum_replace2(&iph->check, iph->tot_len, newlen);
1411 iph->tot_len = newlen;
1414 ops = rcu_dereference(inet_offloads[proto]);
1415 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1418 /* Only need to add sizeof(*iph) to get to the next hdr below
1419 * because any hdr with option will have been flushed in
1420 * inet_gro_receive().
1422 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1430 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1431 unsigned short type, unsigned char protocol,
1434 struct socket *sock;
1435 int rc = sock_create_kern(family, type, protocol, &sock);
1439 (*sk)->sk_allocation = GFP_ATOMIC;
1441 * Unhash it so that IP input processing does not even see it,
1442 * we do not wish this socket to see incoming packets.
1444 (*sk)->sk_prot->unhash(*sk);
1446 sk_change_net(*sk, net);
1450 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1452 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1454 unsigned long res = 0;
1457 for_each_possible_cpu(i)
1458 res += *(((unsigned long *) per_cpu_ptr(mib, i)) + offt);
1461 EXPORT_SYMBOL_GPL(snmp_fold_field);
1463 #if BITS_PER_LONG==32
1465 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1470 for_each_possible_cpu(cpu) {
1472 struct u64_stats_sync *syncp;
1476 bhptr = per_cpu_ptr(mib, cpu);
1477 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1479 start = u64_stats_fetch_begin_irq(syncp);
1480 v = *(((u64 *) bhptr) + offt);
1481 } while (u64_stats_fetch_retry_irq(syncp, start));
1487 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1490 #ifdef CONFIG_IP_MULTICAST
1491 static const struct net_protocol igmp_protocol = {
1492 .handler = igmp_rcv,
1497 static const struct net_protocol tcp_protocol = {
1498 .early_demux = tcp_v4_early_demux,
1499 .handler = tcp_v4_rcv,
1500 .err_handler = tcp_v4_err,
1503 .icmp_strict_tag_validation = 1,
1506 static const struct net_protocol udp_protocol = {
1507 .early_demux = udp_v4_early_demux,
1509 .err_handler = udp_err,
1514 static const struct net_protocol icmp_protocol = {
1515 .handler = icmp_rcv,
1516 .err_handler = icmp_err,
1521 static __net_init int ipv4_mib_init_net(struct net *net)
1525 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1526 if (!net->mib.tcp_statistics)
1528 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1529 if (!net->mib.ip_statistics)
1532 for_each_possible_cpu(i) {
1533 struct ipstats_mib *af_inet_stats;
1534 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1535 u64_stats_init(&af_inet_stats->syncp);
1538 net->mib.net_statistics = alloc_percpu(struct linux_mib);
1539 if (!net->mib.net_statistics)
1541 net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1542 if (!net->mib.udp_statistics)
1544 net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1545 if (!net->mib.udplite_statistics)
1546 goto err_udplite_mib;
1547 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1548 if (!net->mib.icmp_statistics)
1550 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1552 if (!net->mib.icmpmsg_statistics)
1553 goto err_icmpmsg_mib;
1559 free_percpu(net->mib.icmp_statistics);
1561 free_percpu(net->mib.udplite_statistics);
1563 free_percpu(net->mib.udp_statistics);
1565 free_percpu(net->mib.net_statistics);
1567 free_percpu(net->mib.ip_statistics);
1569 free_percpu(net->mib.tcp_statistics);
1574 static __net_exit void ipv4_mib_exit_net(struct net *net)
1576 kfree(net->mib.icmpmsg_statistics);
1577 free_percpu(net->mib.icmp_statistics);
1578 free_percpu(net->mib.udplite_statistics);
1579 free_percpu(net->mib.udp_statistics);
1580 free_percpu(net->mib.net_statistics);
1581 free_percpu(net->mib.ip_statistics);
1582 free_percpu(net->mib.tcp_statistics);
1585 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1586 .init = ipv4_mib_init_net,
1587 .exit = ipv4_mib_exit_net,
1590 static int __init init_ipv4_mibs(void)
1592 return register_pernet_subsys(&ipv4_mib_ops);
1595 static __net_init int inet_init_net(struct net *net)
1598 * Set defaults for local port range
1600 seqlock_init(&net->ipv4.ip_local_ports.lock);
1601 net->ipv4.ip_local_ports.range[0] = 32768;
1602 net->ipv4.ip_local_ports.range[1] = 61000;
1604 seqlock_init(&net->ipv4.ping_group_range.lock);
1606 * Sane defaults - nobody may create ping sockets.
1607 * Boot scripts should set this to distro-specific group.
1609 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1610 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1614 static __net_exit void inet_exit_net(struct net *net)
1618 static __net_initdata struct pernet_operations af_inet_ops = {
1619 .init = inet_init_net,
1620 .exit = inet_exit_net,
1623 static int __init init_inet_pernet_ops(void)
1625 return register_pernet_subsys(&af_inet_ops);
1628 static int ipv4_proc_init(void);
1631 * IP protocol layer initialiser
1634 static struct packet_offload ip_packet_offload __read_mostly = {
1635 .type = cpu_to_be16(ETH_P_IP),
1637 .gso_segment = inet_gso_segment,
1638 .gro_receive = inet_gro_receive,
1639 .gro_complete = inet_gro_complete,
1643 static const struct net_offload ipip_offload = {
1645 .gso_segment = inet_gso_segment,
1646 .gro_receive = inet_gro_receive,
1647 .gro_complete = inet_gro_complete,
1651 static int __init ipv4_offload_init(void)
1656 if (udpv4_offload_init() < 0)
1657 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1658 if (tcpv4_offload_init() < 0)
1659 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1661 dev_add_offload(&ip_packet_offload);
1662 inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1666 fs_initcall(ipv4_offload_init);
1668 static struct packet_type ip_packet_type __read_mostly = {
1669 .type = cpu_to_be16(ETH_P_IP),
1673 static int __init inet_init(void)
1675 struct inet_protosw *q;
1676 struct list_head *r;
1679 sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1681 rc = proto_register(&tcp_prot, 1);
1685 rc = proto_register(&udp_prot, 1);
1687 goto out_unregister_tcp_proto;
1689 rc = proto_register(&raw_prot, 1);
1691 goto out_unregister_udp_proto;
1693 rc = proto_register(&ping_prot, 1);
1695 goto out_unregister_raw_proto;
1698 * Tell SOCKET that we are alive...
1701 (void)sock_register(&inet_family_ops);
1703 #ifdef CONFIG_SYSCTL
1704 ip_static_sysctl_init();
1708 * Add all the base protocols.
1711 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1712 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1713 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1714 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1715 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1716 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1717 #ifdef CONFIG_IP_MULTICAST
1718 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1719 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1722 /* Register the socket-side information for inet_create. */
1723 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1726 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1727 inet_register_protosw(q);
1730 * Set the ARP module up
1736 * Set the IP module up
1743 /* Setup TCP slab cache for open requests. */
1746 /* Setup UDP memory threshold */
1749 /* Add UDP-Lite (RFC 3828) */
1750 udplite4_register();
1755 * Set the ICMP layer up
1758 if (icmp_init() < 0)
1759 panic("Failed to create the ICMP control socket.\n");
1762 * Initialise the multicast router
1764 #if defined(CONFIG_IP_MROUTE)
1766 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1769 if (init_inet_pernet_ops())
1770 pr_crit("%s: Cannot init ipv4 inet pernet ops\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);
1796 fs_initcall(inet_init);
1798 /* ------------------------------------------------------------------------ */
1800 #ifdef CONFIG_PROC_FS
1801 static int __init ipv4_proc_init(void)
1805 if (raw_proc_init())
1807 if (tcp4_proc_init())
1809 if (udp4_proc_init())
1811 if (ping_proc_init())
1813 if (ip_misc_proc_init())
1830 #else /* CONFIG_PROC_FS */
1831 static int __init ipv4_proc_init(void)
1835 #endif /* CONFIG_PROC_FS */
1837 MODULE_ALIAS_NETPROTO(PF_INET);