2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * PF_INET protocol family socket handler.
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Florian La Roche, <flla@stud.uni-sb.de>
11 * Alan Cox, <A.Cox@swansea.ac.uk>
13 * Changes (see also sock.c)
16 * Karl Knutson : Socket protocol table
17 * A.N.Kuznetsov : Socket death error in accept().
18 * John Richardson : Fix non blocking error in connect()
19 * so sockets that fail to connect
20 * don't return -EINPROGRESS.
21 * Alan Cox : Asynchronous I/O support
22 * Alan Cox : Keep correct socket pointer on sock
25 * Alan Cox : Semantics of SO_LINGER aren't state
26 * moved to close when you look carefully.
27 * With this fixed and the accept bug fixed
28 * some RPC stuff seems happier.
29 * Niibe Yutaka : 4.4BSD style write async I/O
31 * Tony Gale : Fixed reuse semantics.
32 * Alan Cox : bind() shouldn't abort existing but dead
33 * sockets. Stops FTP netin:.. I hope.
34 * Alan Cox : bind() works correctly for RAW sockets.
35 * Note that FreeBSD at least was broken
36 * in this respect so be careful with
37 * compatibility tests...
38 * Alan Cox : routing cache support
39 * Alan Cox : memzero the socket structure for
41 * Matt Day : nonblock connect error handler
42 * Alan Cox : Allow large numbers of pending sockets
43 * (eg for big web sites), but only if
44 * specifically application requested.
45 * Alan Cox : New buffering throughout IP. Used
47 * Alan Cox : New buffering now used smartly.
48 * Alan Cox : BSD rather than common sense
49 * interpretation of listen.
50 * Germano Caronni : Assorted small races.
51 * Alan Cox : sendmsg/recvmsg basic support.
52 * Alan Cox : Only sendmsg/recvmsg now supported.
53 * Alan Cox : Locked down bind (see security list).
54 * Alan Cox : Loosened bind a little.
55 * Mike McLagan : ADD/DEL DLCI Ioctls
56 * Willy Konynenberg : Transparent proxying support.
57 * David S. Miller : New socket lookup architecture.
58 * Some other random speedups.
59 * Cyrus Durgin : Cleaned up file for kmod hacks.
60 * Andi Kleen : Fix inet_stream_connect TCP race.
62 * This program is free software; you can redistribute it and/or
63 * modify it under the terms of the GNU General Public License
64 * as published by the Free Software Foundation; either version
65 * 2 of the License, or (at your option) any later version.
68 #include <linux/err.h>
69 #include <linux/errno.h>
70 #include <linux/types.h>
71 #include <linux/socket.h>
73 #include <linux/kernel.h>
74 #include <linux/module.h>
75 #include <linux/sched.h>
76 #include <linux/timer.h>
77 #include <linux/string.h>
78 #include <linux/sockios.h>
79 #include <linux/net.h>
80 #include <linux/capability.h>
81 #include <linux/fcntl.h>
83 #include <linux/interrupt.h>
84 #include <linux/stat.h>
85 #include <linux/init.h>
86 #include <linux/poll.h>
87 #include <linux/netfilter_ipv4.h>
88 #include <linux/random.h>
89 #include <linux/slab.h>
91 #include <asm/uaccess.h>
92 #include <asm/system.h>
94 #include <linux/inet.h>
95 #include <linux/igmp.h>
96 #include <linux/inetdevice.h>
97 #include <linux/netdevice.h>
98 #include <net/checksum.h>
100 #include <net/protocol.h>
102 #include <net/route.h>
103 #include <net/ip_fib.h>
104 #include <net/inet_connection_sock.h>
107 #include <net/udplite.h>
108 #include <net/ping.h>
109 #include <linux/skbuff.h>
110 #include <net/sock.h>
112 #include <net/icmp.h>
113 #include <net/ipip.h>
114 #include <net/inet_common.h>
115 #include <net/xfrm.h>
116 #include <net/net_namespace.h>
117 #ifdef CONFIG_IP_MROUTE
118 #include <linux/mroute.h>
122 /* The inetsw table contains everything that inet_create needs to
123 * build a new socket.
125 static struct list_head inetsw
[SOCK_MAX
];
126 static DEFINE_SPINLOCK(inetsw_lock
);
128 struct ipv4_config ipv4_config
;
129 EXPORT_SYMBOL(ipv4_config
);
131 /* New destruction routine */
133 void inet_sock_destruct(struct sock
*sk
)
135 struct inet_sock
*inet
= inet_sk(sk
);
137 __skb_queue_purge(&sk
->sk_receive_queue
);
138 __skb_queue_purge(&sk
->sk_error_queue
);
142 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
!= TCP_CLOSE
) {
143 pr_err("Attempt to release TCP socket in state %d %p\n",
147 if (!sock_flag(sk
, SOCK_DEAD
)) {
148 pr_err("Attempt to release alive inet socket %p\n", sk
);
152 WARN_ON(atomic_read(&sk
->sk_rmem_alloc
));
153 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
154 WARN_ON(sk
->sk_wmem_queued
);
155 WARN_ON(sk
->sk_forward_alloc
);
157 kfree(rcu_dereference_protected(inet
->inet_opt
, 1));
158 dst_release(rcu_dereference_check(sk
->sk_dst_cache
, 1));
159 sk_refcnt_debug_dec(sk
);
161 EXPORT_SYMBOL(inet_sock_destruct
);
164 * The routines beyond this point handle the behaviour of an AF_INET
165 * socket object. Mostly it punts to the subprotocols of IP to do
170 * Automatically bind an unbound socket.
173 static int inet_autobind(struct sock
*sk
)
175 struct inet_sock
*inet
;
176 /* We may need to bind the socket. */
179 if (!inet
->inet_num
) {
180 if (sk
->sk_prot
->get_port(sk
, 0)) {
184 inet
->inet_sport
= htons(inet
->inet_num
);
191 * Move a socket into listening state.
193 int inet_listen(struct socket
*sock
, int backlog
)
195 struct sock
*sk
= sock
->sk
;
196 unsigned char old_state
;
202 if (sock
->state
!= SS_UNCONNECTED
|| sock
->type
!= SOCK_STREAM
)
205 old_state
= sk
->sk_state
;
206 if (!((1 << old_state
) & (TCPF_CLOSE
| TCPF_LISTEN
)))
209 /* Really, if the socket is already in listen state
210 * we can only allow the backlog to be adjusted.
212 if (old_state
!= TCP_LISTEN
) {
213 err
= inet_csk_listen_start(sk
, backlog
);
217 sk
->sk_max_ack_backlog
= backlog
;
224 EXPORT_SYMBOL(inet_listen
);
226 u32 inet_ehash_secret __read_mostly
;
227 EXPORT_SYMBOL(inet_ehash_secret
);
230 * inet_ehash_secret must be set exactly once
232 void build_ehash_secret(void)
237 get_random_bytes(&rnd
, sizeof(rnd
));
240 cmpxchg(&inet_ehash_secret
, 0, rnd
);
242 EXPORT_SYMBOL(build_ehash_secret
);
244 static inline int inet_netns_ok(struct net
*net
, int protocol
)
247 const struct net_protocol
*ipprot
;
249 if (net_eq(net
, &init_net
))
252 hash
= protocol
& (MAX_INET_PROTOS
- 1);
253 ipprot
= rcu_dereference(inet_protos
[hash
]);
258 return ipprot
->netns_ok
;
262 * Create an inet socket.
265 static int inet_create(struct net
*net
, struct socket
*sock
, int protocol
,
269 struct inet_protosw
*answer
;
270 struct inet_sock
*inet
;
271 struct proto
*answer_prot
;
272 unsigned char answer_flags
;
273 char answer_no_check
;
274 int try_loading_module
= 0;
277 if (unlikely(!inet_ehash_secret
))
278 if (sock
->type
!= SOCK_RAW
&& sock
->type
!= SOCK_DGRAM
)
279 build_ehash_secret();
281 sock
->state
= SS_UNCONNECTED
;
283 /* Look for the requested type/protocol pair. */
285 err
= -ESOCKTNOSUPPORT
;
287 list_for_each_entry_rcu(answer
, &inetsw
[sock
->type
], list
) {
290 /* Check the non-wild match. */
291 if (protocol
== answer
->protocol
) {
292 if (protocol
!= IPPROTO_IP
)
295 /* Check for the two wild cases. */
296 if (IPPROTO_IP
== protocol
) {
297 protocol
= answer
->protocol
;
300 if (IPPROTO_IP
== answer
->protocol
)
303 err
= -EPROTONOSUPPORT
;
307 if (try_loading_module
< 2) {
310 * Be more specific, e.g. net-pf-2-proto-132-type-1
311 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
313 if (++try_loading_module
== 1)
314 request_module("net-pf-%d-proto-%d-type-%d",
315 PF_INET
, protocol
, sock
->type
);
317 * Fall back to generic, e.g. net-pf-2-proto-132
318 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
321 request_module("net-pf-%d-proto-%d",
323 goto lookup_protocol
;
329 if (sock
->type
== SOCK_RAW
&& !kern
&& !capable(CAP_NET_RAW
))
333 if (!inet_netns_ok(net
, protocol
))
336 sock
->ops
= answer
->ops
;
337 answer_prot
= answer
->prot
;
338 answer_no_check
= answer
->no_check
;
339 answer_flags
= answer
->flags
;
342 WARN_ON(answer_prot
->slab
== NULL
);
345 sk
= sk_alloc(net
, PF_INET
, GFP_KERNEL
, answer_prot
);
350 sk
->sk_no_check
= answer_no_check
;
351 if (INET_PROTOSW_REUSE
& answer_flags
)
355 inet
->is_icsk
= (INET_PROTOSW_ICSK
& answer_flags
) != 0;
359 if (SOCK_RAW
== sock
->type
) {
360 inet
->inet_num
= protocol
;
361 if (IPPROTO_RAW
== protocol
)
365 if (ipv4_config
.no_pmtu_disc
)
366 inet
->pmtudisc
= IP_PMTUDISC_DONT
;
368 inet
->pmtudisc
= IP_PMTUDISC_WANT
;
372 sock_init_data(sock
, sk
);
374 sk
->sk_destruct
= inet_sock_destruct
;
375 sk
->sk_protocol
= protocol
;
376 sk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
383 inet
->mc_list
= NULL
;
385 sk_refcnt_debug_inc(sk
);
387 if (inet
->inet_num
) {
388 /* It assumes that any protocol which allows
389 * the user to assign a number at socket
390 * creation time automatically
393 inet
->inet_sport
= htons(inet
->inet_num
);
394 /* Add to protocol hash chains. */
395 sk
->sk_prot
->hash(sk
);
398 if (sk
->sk_prot
->init
) {
399 err
= sk
->sk_prot
->init(sk
);
401 sk_common_release(sk
);
412 * The peer socket should always be NULL (or else). When we call this
413 * function we are destroying the object and from then on nobody
414 * should refer to it.
416 int inet_release(struct socket
*sock
)
418 struct sock
*sk
= sock
->sk
;
423 sock_rps_reset_flow(sk
);
425 /* Applications forget to leave groups before exiting */
426 ip_mc_drop_socket(sk
);
428 /* If linger is set, we don't return until the close
429 * is complete. Otherwise we return immediately. The
430 * actually closing is done the same either way.
432 * If the close is due to the process exiting, we never
436 if (sock_flag(sk
, SOCK_LINGER
) &&
437 !(current
->flags
& PF_EXITING
))
438 timeout
= sk
->sk_lingertime
;
440 sk
->sk_prot
->close(sk
, timeout
);
444 EXPORT_SYMBOL(inet_release
);
446 /* It is off by default, see below. */
447 int sysctl_ip_nonlocal_bind __read_mostly
;
448 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind
);
450 int inet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
452 struct sockaddr_in
*addr
= (struct sockaddr_in
*)uaddr
;
453 struct sock
*sk
= sock
->sk
;
454 struct inet_sock
*inet
= inet_sk(sk
);
459 /* If the socket has its own bind function then use it. (RAW) */
460 if (sk
->sk_prot
->bind
) {
461 err
= sk
->sk_prot
->bind(sk
, uaddr
, addr_len
);
465 if (addr_len
< sizeof(struct sockaddr_in
))
468 chk_addr_ret
= inet_addr_type(sock_net(sk
), addr
->sin_addr
.s_addr
);
470 /* Not specified by any standard per-se, however it breaks too
471 * many applications when removed. It is unfortunate since
472 * allowing applications to make a non-local bind solves
473 * several problems with systems using dynamic addressing.
474 * (ie. your servers still start up even if your ISDN link
475 * is temporarily down)
477 err
= -EADDRNOTAVAIL
;
478 if (!sysctl_ip_nonlocal_bind
&&
479 !(inet
->freebind
|| inet
->transparent
) &&
480 addr
->sin_addr
.s_addr
!= htonl(INADDR_ANY
) &&
481 chk_addr_ret
!= RTN_LOCAL
&&
482 chk_addr_ret
!= RTN_MULTICAST
&&
483 chk_addr_ret
!= RTN_BROADCAST
)
486 snum
= ntohs(addr
->sin_port
);
488 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
491 /* We keep a pair of addresses. rcv_saddr is the one
492 * used by hash lookups, and saddr is used for transmit.
494 * In the BSD API these are the same except where it
495 * would be illegal to use them (multicast/broadcast) in
496 * which case the sending device address is used.
500 /* Check these errors (active socket, double bind). */
502 if (sk
->sk_state
!= TCP_CLOSE
|| inet
->inet_num
)
503 goto out_release_sock
;
505 inet
->inet_rcv_saddr
= inet
->inet_saddr
= addr
->sin_addr
.s_addr
;
506 if (chk_addr_ret
== RTN_MULTICAST
|| chk_addr_ret
== RTN_BROADCAST
)
507 inet
->inet_saddr
= 0; /* Use device */
509 /* Make sure we are allowed to bind here. */
510 if (sk
->sk_prot
->get_port(sk
, snum
)) {
511 inet
->inet_saddr
= inet
->inet_rcv_saddr
= 0;
513 goto out_release_sock
;
516 if (inet
->inet_rcv_saddr
)
517 sk
->sk_userlocks
|= SOCK_BINDADDR_LOCK
;
519 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
520 inet
->inet_sport
= htons(inet
->inet_num
);
521 inet
->inet_daddr
= 0;
522 inet
->inet_dport
= 0;
530 EXPORT_SYMBOL(inet_bind
);
532 int inet_dgram_connect(struct socket
*sock
, struct sockaddr
* uaddr
,
533 int addr_len
, int flags
)
535 struct sock
*sk
= sock
->sk
;
537 if (addr_len
< sizeof(uaddr
->sa_family
))
539 if (uaddr
->sa_family
== AF_UNSPEC
)
540 return sk
->sk_prot
->disconnect(sk
, flags
);
542 if (!inet_sk(sk
)->inet_num
&& inet_autobind(sk
))
544 return sk
->sk_prot
->connect(sk
, (struct sockaddr
*)uaddr
, addr_len
);
546 EXPORT_SYMBOL(inet_dgram_connect
);
548 static long inet_wait_for_connect(struct sock
*sk
, long timeo
)
552 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
554 /* Basic assumption: if someone sets sk->sk_err, he _must_
555 * change state of the socket from TCP_SYN_*.
556 * Connect() does not allow to get error notifications
557 * without closing the socket.
559 while ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
561 timeo
= schedule_timeout(timeo
);
563 if (signal_pending(current
) || !timeo
)
565 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
567 finish_wait(sk_sleep(sk
), &wait
);
572 * Connect to a remote host. There is regrettably still a little
573 * TCP 'magic' in here.
575 int inet_stream_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
576 int addr_len
, int flags
)
578 struct sock
*sk
= sock
->sk
;
582 if (addr_len
< sizeof(uaddr
->sa_family
))
587 if (uaddr
->sa_family
== AF_UNSPEC
) {
588 err
= sk
->sk_prot
->disconnect(sk
, flags
);
589 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
593 switch (sock
->state
) {
602 /* Fall out of switch with err, set for this state */
606 if (sk
->sk_state
!= TCP_CLOSE
)
609 err
= sk
->sk_prot
->connect(sk
, uaddr
, addr_len
);
613 sock
->state
= SS_CONNECTING
;
615 /* Just entered SS_CONNECTING state; the only
616 * difference is that return value in non-blocking
617 * case is EINPROGRESS, rather than EALREADY.
623 timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
625 if ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
626 /* Error code is set above */
627 if (!timeo
|| !inet_wait_for_connect(sk
, timeo
))
630 err
= sock_intr_errno(timeo
);
631 if (signal_pending(current
))
635 /* Connection was closed by RST, timeout, ICMP error
636 * or another process disconnected us.
638 if (sk
->sk_state
== TCP_CLOSE
)
641 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
642 * and error was received after socket entered established state.
643 * Hence, it is handled normally after connect() return successfully.
646 sock
->state
= SS_CONNECTED
;
653 err
= sock_error(sk
) ? : -ECONNABORTED
;
654 sock
->state
= SS_UNCONNECTED
;
655 if (sk
->sk_prot
->disconnect(sk
, flags
))
656 sock
->state
= SS_DISCONNECTING
;
659 EXPORT_SYMBOL(inet_stream_connect
);
662 * Accept a pending connection. The TCP layer now gives BSD semantics.
665 int inet_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
667 struct sock
*sk1
= sock
->sk
;
669 struct sock
*sk2
= sk1
->sk_prot
->accept(sk1
, flags
, &err
);
676 WARN_ON(!((1 << sk2
->sk_state
) &
677 (TCPF_ESTABLISHED
| 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 kiocb
*iocb
, struct socket
*sock
, struct msghdr
*msg
,
724 struct sock
*sk
= sock
->sk
;
726 sock_rps_record_flow(sk
);
728 /* We may need to bind the socket. */
729 if (!inet_sk(sk
)->inet_num
&& !sk
->sk_prot
->no_autobind
&&
733 return sk
->sk_prot
->sendmsg(iocb
, sk
, msg
, size
);
735 EXPORT_SYMBOL(inet_sendmsg
);
737 ssize_t
inet_sendpage(struct socket
*sock
, struct page
*page
, int offset
,
738 size_t size
, int flags
)
740 struct sock
*sk
= sock
->sk
;
742 sock_rps_record_flow(sk
);
744 /* We may need to bind the socket. */
745 if (!inet_sk(sk
)->inet_num
&& !sk
->sk_prot
->no_autobind
&&
749 if (sk
->sk_prot
->sendpage
)
750 return sk
->sk_prot
->sendpage(sk
, page
, offset
, size
, flags
);
751 return sock_no_sendpage(sock
, page
, offset
, size
, flags
);
753 EXPORT_SYMBOL(inet_sendpage
);
755 int inet_recvmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*msg
,
756 size_t size
, int flags
)
758 struct sock
*sk
= sock
->sk
;
762 sock_rps_record_flow(sk
);
764 err
= sk
->sk_prot
->recvmsg(iocb
, sk
, msg
, size
, flags
& MSG_DONTWAIT
,
765 flags
& ~MSG_DONTWAIT
, &addr_len
);
767 msg
->msg_namelen
= addr_len
;
770 EXPORT_SYMBOL(inet_recvmsg
);
772 int inet_shutdown(struct socket
*sock
, int how
)
774 struct sock
*sk
= sock
->sk
;
777 /* This should really check to make sure
778 * the socket is a TCP socket. (WHY AC...)
780 how
++; /* maps 0->1 has the advantage of making bit 1 rcvs and
783 if ((how
& ~SHUTDOWN_MASK
) || !how
) /* MAXINT->0 */
787 if (sock
->state
== SS_CONNECTING
) {
788 if ((1 << sk
->sk_state
) &
789 (TCPF_SYN_SENT
| TCPF_SYN_RECV
| TCPF_CLOSE
))
790 sock
->state
= SS_DISCONNECTING
;
792 sock
->state
= SS_CONNECTED
;
795 switch (sk
->sk_state
) {
798 /* Hack to wake up other listeners, who can poll for
799 POLLHUP, even on eg. unconnected UDP sockets -- RR */
801 sk
->sk_shutdown
|= how
;
802 if (sk
->sk_prot
->shutdown
)
803 sk
->sk_prot
->shutdown(sk
, how
);
806 /* Remaining two branches are temporary solution for missing
807 * close() in multithreaded environment. It is _not_ a good idea,
808 * but we have no choice until close() is repaired at VFS level.
811 if (!(how
& RCV_SHUTDOWN
))
815 err
= sk
->sk_prot
->disconnect(sk
, O_NONBLOCK
);
816 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
820 /* Wake up anyone sleeping in poll. */
821 sk
->sk_state_change(sk
);
825 EXPORT_SYMBOL(inet_shutdown
);
828 * ioctl() calls you can issue on an INET socket. Most of these are
829 * device configuration and stuff and very rarely used. Some ioctls
830 * pass on to the socket itself.
832 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
833 * loads the devconfigure module does its configuring and unloads it.
834 * There's a good 20K of config code hanging around the kernel.
837 int inet_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
839 struct sock
*sk
= sock
->sk
;
841 struct net
*net
= sock_net(sk
);
845 err
= sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
848 err
= sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
853 err
= ip_rt_ioctl(net
, cmd
, (void __user
*)arg
);
858 err
= arp_ioctl(net
, cmd
, (void __user
*)arg
);
871 err
= devinet_ioctl(net
, cmd
, (void __user
*)arg
);
874 if (sk
->sk_prot
->ioctl
)
875 err
= sk
->sk_prot
->ioctl(sk
, cmd
, arg
);
882 EXPORT_SYMBOL(inet_ioctl
);
885 int inet_compat_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
887 struct sock
*sk
= sock
->sk
;
888 int err
= -ENOIOCTLCMD
;
890 if (sk
->sk_prot
->compat_ioctl
)
891 err
= sk
->sk_prot
->compat_ioctl(sk
, cmd
, arg
);
897 const struct proto_ops inet_stream_ops
= {
899 .owner
= THIS_MODULE
,
900 .release
= inet_release
,
902 .connect
= inet_stream_connect
,
903 .socketpair
= sock_no_socketpair
,
904 .accept
= inet_accept
,
905 .getname
= inet_getname
,
908 .listen
= inet_listen
,
909 .shutdown
= inet_shutdown
,
910 .setsockopt
= sock_common_setsockopt
,
911 .getsockopt
= sock_common_getsockopt
,
912 .sendmsg
= inet_sendmsg
,
913 .recvmsg
= inet_recvmsg
,
914 .mmap
= sock_no_mmap
,
915 .sendpage
= inet_sendpage
,
916 .splice_read
= tcp_splice_read
,
918 .compat_setsockopt
= compat_sock_common_setsockopt
,
919 .compat_getsockopt
= compat_sock_common_getsockopt
,
920 .compat_ioctl
= inet_compat_ioctl
,
923 EXPORT_SYMBOL(inet_stream_ops
);
925 const struct proto_ops inet_dgram_ops
= {
927 .owner
= THIS_MODULE
,
928 .release
= inet_release
,
930 .connect
= inet_dgram_connect
,
931 .socketpair
= sock_no_socketpair
,
932 .accept
= sock_no_accept
,
933 .getname
= inet_getname
,
936 .listen
= sock_no_listen
,
937 .shutdown
= inet_shutdown
,
938 .setsockopt
= sock_common_setsockopt
,
939 .getsockopt
= sock_common_getsockopt
,
940 .sendmsg
= inet_sendmsg
,
941 .recvmsg
= inet_recvmsg
,
942 .mmap
= sock_no_mmap
,
943 .sendpage
= inet_sendpage
,
945 .compat_setsockopt
= compat_sock_common_setsockopt
,
946 .compat_getsockopt
= compat_sock_common_getsockopt
,
947 .compat_ioctl
= inet_compat_ioctl
,
950 EXPORT_SYMBOL(inet_dgram_ops
);
953 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
956 static const struct proto_ops inet_sockraw_ops
= {
958 .owner
= THIS_MODULE
,
959 .release
= inet_release
,
961 .connect
= inet_dgram_connect
,
962 .socketpair
= sock_no_socketpair
,
963 .accept
= sock_no_accept
,
964 .getname
= inet_getname
,
965 .poll
= datagram_poll
,
967 .listen
= sock_no_listen
,
968 .shutdown
= inet_shutdown
,
969 .setsockopt
= sock_common_setsockopt
,
970 .getsockopt
= sock_common_getsockopt
,
971 .sendmsg
= inet_sendmsg
,
972 .recvmsg
= inet_recvmsg
,
973 .mmap
= sock_no_mmap
,
974 .sendpage
= inet_sendpage
,
976 .compat_setsockopt
= compat_sock_common_setsockopt
,
977 .compat_getsockopt
= compat_sock_common_getsockopt
,
978 .compat_ioctl
= inet_compat_ioctl
,
982 static const struct net_proto_family inet_family_ops
= {
984 .create
= inet_create
,
985 .owner
= THIS_MODULE
,
988 /* Upon startup we insert all the elements in inetsw_array[] into
989 * the linked list inetsw.
991 static struct inet_protosw inetsw_array
[] =
995 .protocol
= IPPROTO_TCP
,
997 .ops
= &inet_stream_ops
,
999 .flags
= INET_PROTOSW_PERMANENT
|
1005 .protocol
= IPPROTO_UDP
,
1007 .ops
= &inet_dgram_ops
,
1008 .no_check
= UDP_CSUM_DEFAULT
,
1009 .flags
= INET_PROTOSW_PERMANENT
,
1014 .protocol
= IPPROTO_ICMP
,
1016 .ops
= &inet_dgram_ops
,
1017 .no_check
= UDP_CSUM_DEFAULT
,
1018 .flags
= INET_PROTOSW_REUSE
,
1023 .protocol
= IPPROTO_IP
, /* wild card */
1025 .ops
= &inet_sockraw_ops
,
1026 .no_check
= UDP_CSUM_DEFAULT
,
1027 .flags
= INET_PROTOSW_REUSE
,
1031 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1033 void inet_register_protosw(struct inet_protosw
*p
)
1035 struct list_head
*lh
;
1036 struct inet_protosw
*answer
;
1037 int protocol
= p
->protocol
;
1038 struct list_head
*last_perm
;
1040 spin_lock_bh(&inetsw_lock
);
1042 if (p
->type
>= SOCK_MAX
)
1045 /* If we are trying to override a permanent protocol, bail. */
1047 last_perm
= &inetsw
[p
->type
];
1048 list_for_each(lh
, &inetsw
[p
->type
]) {
1049 answer
= list_entry(lh
, struct inet_protosw
, list
);
1051 /* Check only the non-wild match. */
1052 if (INET_PROTOSW_PERMANENT
& answer
->flags
) {
1053 if (protocol
== answer
->protocol
)
1063 /* Add the new entry after the last permanent entry if any, so that
1064 * the new entry does not override a permanent entry when matched with
1065 * a wild-card protocol. But it is allowed to override any existing
1066 * non-permanent entry. This means that when we remove this entry, the
1067 * system automatically returns to the old behavior.
1069 list_add_rcu(&p
->list
, last_perm
);
1071 spin_unlock_bh(&inetsw_lock
);
1076 printk(KERN_ERR
"Attempt to override permanent protocol %d.\n",
1082 "Ignoring attempt to register invalid socket type %d.\n",
1086 EXPORT_SYMBOL(inet_register_protosw
);
1088 void inet_unregister_protosw(struct inet_protosw
*p
)
1090 if (INET_PROTOSW_PERMANENT
& p
->flags
) {
1092 "Attempt to unregister permanent protocol %d.\n",
1095 spin_lock_bh(&inetsw_lock
);
1096 list_del_rcu(&p
->list
);
1097 spin_unlock_bh(&inetsw_lock
);
1102 EXPORT_SYMBOL(inet_unregister_protosw
);
1105 * Shall we try to damage output packets if routing dev changes?
1108 int sysctl_ip_dynaddr __read_mostly
;
1110 static int inet_sk_reselect_saddr(struct sock
*sk
)
1112 struct inet_sock
*inet
= inet_sk(sk
);
1113 __be32 old_saddr
= inet
->inet_saddr
;
1114 __be32 daddr
= inet
->inet_daddr
;
1118 struct ip_options_rcu
*inet_opt
;
1120 inet_opt
= rcu_dereference_protected(inet
->inet_opt
,
1121 sock_owned_by_user(sk
));
1122 if (inet_opt
&& inet_opt
->opt
.srr
)
1123 daddr
= inet_opt
->opt
.faddr
;
1125 /* Query new route. */
1126 fl4
= &inet
->cork
.fl
.u
.ip4
;
1127 rt
= ip_route_connect(fl4
, daddr
, 0, RT_CONN_FLAGS(sk
),
1128 sk
->sk_bound_dev_if
, sk
->sk_protocol
,
1129 inet
->inet_sport
, inet
->inet_dport
, sk
, false);
1133 sk_setup_caps(sk
, &rt
->dst
);
1135 new_saddr
= fl4
->saddr
;
1137 if (new_saddr
== old_saddr
)
1140 if (sysctl_ip_dynaddr
> 1) {
1141 printk(KERN_INFO
"%s(): shifting inet->saddr from %pI4 to %pI4\n",
1142 __func__
, &old_saddr
, &new_saddr
);
1145 inet
->inet_saddr
= inet
->inet_rcv_saddr
= new_saddr
;
1148 * XXX The only one ugly spot where we need to
1149 * XXX really change the sockets identity after
1150 * XXX it has entered the hashes. -DaveM
1152 * Besides that, it does not check for connection
1153 * uniqueness. Wait for troubles.
1155 __sk_prot_rehash(sk
);
1159 int inet_sk_rebuild_header(struct sock
*sk
)
1161 struct inet_sock
*inet
= inet_sk(sk
);
1162 struct rtable
*rt
= (struct rtable
*)__sk_dst_check(sk
, 0);
1164 struct ip_options_rcu
*inet_opt
;
1168 /* Route is OK, nothing to do. */
1174 inet_opt
= rcu_dereference(inet
->inet_opt
);
1175 daddr
= inet
->inet_daddr
;
1176 if (inet_opt
&& inet_opt
->opt
.srr
)
1177 daddr
= inet_opt
->opt
.faddr
;
1179 fl4
= &inet
->cork
.fl
.u
.ip4
;
1180 rt
= ip_route_output_ports(sock_net(sk
), fl4
, sk
, daddr
, inet
->inet_saddr
,
1181 inet
->inet_dport
, inet
->inet_sport
,
1182 sk
->sk_protocol
, RT_CONN_FLAGS(sk
),
1183 sk
->sk_bound_dev_if
);
1186 sk_setup_caps(sk
, &rt
->dst
);
1190 /* Routing failed... */
1191 sk
->sk_route_caps
= 0;
1193 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1194 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1196 if (!sysctl_ip_dynaddr
||
1197 sk
->sk_state
!= TCP_SYN_SENT
||
1198 (sk
->sk_userlocks
& SOCK_BINDADDR_LOCK
) ||
1199 (err
= inet_sk_reselect_saddr(sk
)) != 0)
1200 sk
->sk_err_soft
= -err
;
1205 EXPORT_SYMBOL(inet_sk_rebuild_header
);
1207 static int inet_gso_send_check(struct sk_buff
*skb
)
1209 const struct iphdr
*iph
;
1210 const struct net_protocol
*ops
;
1215 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1220 if (ihl
< sizeof(*iph
))
1223 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1226 __skb_pull(skb
, ihl
);
1227 skb_reset_transport_header(skb
);
1229 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1230 err
= -EPROTONOSUPPORT
;
1233 ops
= rcu_dereference(inet_protos
[proto
]);
1234 if (likely(ops
&& ops
->gso_send_check
))
1235 err
= ops
->gso_send_check(skb
);
1242 static struct sk_buff
*inet_gso_segment(struct sk_buff
*skb
, u32 features
)
1244 struct sk_buff
*segs
= ERR_PTR(-EINVAL
);
1246 const struct net_protocol
*ops
;
1250 unsigned int offset
= 0;
1252 if (!(features
& NETIF_F_V4_CSUM
))
1253 features
&= ~NETIF_F_SG
;
1255 if (unlikely(skb_shinfo(skb
)->gso_type
&
1263 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1268 if (ihl
< sizeof(*iph
))
1271 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1274 __skb_pull(skb
, ihl
);
1275 skb_reset_transport_header(skb
);
1277 id
= ntohs(iph
->id
);
1278 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1279 segs
= ERR_PTR(-EPROTONOSUPPORT
);
1282 ops
= rcu_dereference(inet_protos
[proto
]);
1283 if (likely(ops
&& ops
->gso_segment
))
1284 segs
= ops
->gso_segment(skb
, features
);
1287 if (!segs
|| IS_ERR(segs
))
1293 if (proto
== IPPROTO_UDP
) {
1294 iph
->id
= htons(id
);
1295 iph
->frag_off
= htons(offset
>> 3);
1296 if (skb
->next
!= NULL
)
1297 iph
->frag_off
|= htons(IP_MF
);
1298 offset
+= (skb
->len
- skb
->mac_len
- iph
->ihl
* 4);
1300 iph
->id
= htons(id
++);
1301 iph
->tot_len
= htons(skb
->len
- skb
->mac_len
);
1303 iph
->check
= ip_fast_csum(skb_network_header(skb
), iph
->ihl
);
1304 } while ((skb
= skb
->next
));
1310 static struct sk_buff
**inet_gro_receive(struct sk_buff
**head
,
1311 struct sk_buff
*skb
)
1313 const struct net_protocol
*ops
;
1314 struct sk_buff
**pp
= NULL
;
1316 const struct iphdr
*iph
;
1323 off
= skb_gro_offset(skb
);
1324 hlen
= off
+ sizeof(*iph
);
1325 iph
= skb_gro_header_fast(skb
, off
);
1326 if (skb_gro_header_hard(skb
, hlen
)) {
1327 iph
= skb_gro_header_slow(skb
, hlen
, off
);
1332 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1335 ops
= rcu_dereference(inet_protos
[proto
]);
1336 if (!ops
|| !ops
->gro_receive
)
1339 if (*(u8
*)iph
!= 0x45)
1342 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1345 id
= ntohl(*(__be32
*)&iph
->id
);
1346 flush
= (u16
)((ntohl(*(__be32
*)iph
) ^ skb_gro_len(skb
)) | (id
^ IP_DF
));
1349 for (p
= *head
; p
; p
= p
->next
) {
1352 if (!NAPI_GRO_CB(p
)->same_flow
)
1357 if ((iph
->protocol
^ iph2
->protocol
) |
1358 (iph
->tos
^ iph2
->tos
) |
1359 ((__force u32
)iph
->saddr
^ (__force u32
)iph2
->saddr
) |
1360 ((__force u32
)iph
->daddr
^ (__force u32
)iph2
->daddr
)) {
1361 NAPI_GRO_CB(p
)->same_flow
= 0;
1365 /* All fields must match except length and checksum. */
1366 NAPI_GRO_CB(p
)->flush
|=
1367 (iph
->ttl
^ iph2
->ttl
) |
1368 ((u16
)(ntohs(iph2
->id
) + NAPI_GRO_CB(p
)->count
) ^ id
);
1370 NAPI_GRO_CB(p
)->flush
|= flush
;
1373 NAPI_GRO_CB(skb
)->flush
|= flush
;
1374 skb_gro_pull(skb
, sizeof(*iph
));
1375 skb_set_transport_header(skb
, skb_gro_offset(skb
));
1377 pp
= ops
->gro_receive(head
, skb
);
1383 NAPI_GRO_CB(skb
)->flush
|= flush
;
1388 static int inet_gro_complete(struct sk_buff
*skb
)
1390 const struct net_protocol
*ops
;
1391 struct iphdr
*iph
= ip_hdr(skb
);
1392 int proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1394 __be16 newlen
= htons(skb
->len
- skb_network_offset(skb
));
1396 csum_replace2(&iph
->check
, iph
->tot_len
, newlen
);
1397 iph
->tot_len
= newlen
;
1400 ops
= rcu_dereference(inet_protos
[proto
]);
1401 if (WARN_ON(!ops
|| !ops
->gro_complete
))
1404 err
= ops
->gro_complete(skb
);
1412 int inet_ctl_sock_create(struct sock
**sk
, unsigned short family
,
1413 unsigned short type
, unsigned char protocol
,
1416 struct socket
*sock
;
1417 int rc
= sock_create_kern(family
, type
, protocol
, &sock
);
1421 (*sk
)->sk_allocation
= GFP_ATOMIC
;
1423 * Unhash it so that IP input processing does not even see it,
1424 * we do not wish this socket to see incoming packets.
1426 (*sk
)->sk_prot
->unhash(*sk
);
1428 sk_change_net(*sk
, net
);
1432 EXPORT_SYMBOL_GPL(inet_ctl_sock_create
);
1434 unsigned long snmp_fold_field(void __percpu
*mib
[], int offt
)
1436 unsigned long res
= 0;
1439 for_each_possible_cpu(i
) {
1440 res
+= *(((unsigned long *) per_cpu_ptr(mib
[0], i
)) + offt
);
1441 res
+= *(((unsigned long *) per_cpu_ptr(mib
[1], i
)) + offt
);
1445 EXPORT_SYMBOL_GPL(snmp_fold_field
);
1447 #if BITS_PER_LONG==32
1449 u64
snmp_fold_field64(void __percpu
*mib
[], int offt
, size_t syncp_offset
)
1454 for_each_possible_cpu(cpu
) {
1455 void *bhptr
, *userptr
;
1456 struct u64_stats_sync
*syncp
;
1460 /* first mib used by softirq context, we must use _bh() accessors */
1461 bhptr
= per_cpu_ptr(SNMP_STAT_BHPTR(mib
), cpu
);
1462 syncp
= (struct u64_stats_sync
*)(bhptr
+ syncp_offset
);
1464 start
= u64_stats_fetch_begin_bh(syncp
);
1465 v_bh
= *(((u64
*) bhptr
) + offt
);
1466 } while (u64_stats_fetch_retry_bh(syncp
, start
));
1468 /* second mib used in USER context */
1469 userptr
= per_cpu_ptr(SNMP_STAT_USRPTR(mib
), cpu
);
1470 syncp
= (struct u64_stats_sync
*)(userptr
+ syncp_offset
);
1472 start
= u64_stats_fetch_begin(syncp
);
1473 v_user
= *(((u64
*) userptr
) + offt
);
1474 } while (u64_stats_fetch_retry(syncp
, start
));
1476 res
+= v_bh
+ v_user
;
1480 EXPORT_SYMBOL_GPL(snmp_fold_field64
);
1483 int snmp_mib_init(void __percpu
*ptr
[2], size_t mibsize
, size_t align
)
1485 BUG_ON(ptr
== NULL
);
1486 ptr
[0] = __alloc_percpu(mibsize
, align
);
1489 ptr
[1] = __alloc_percpu(mibsize
, align
);
1494 free_percpu(ptr
[0]);
1499 EXPORT_SYMBOL_GPL(snmp_mib_init
);
1501 void snmp_mib_free(void __percpu
*ptr
[2])
1503 BUG_ON(ptr
== NULL
);
1504 free_percpu(ptr
[0]);
1505 free_percpu(ptr
[1]);
1506 ptr
[0] = ptr
[1] = NULL
;
1508 EXPORT_SYMBOL_GPL(snmp_mib_free
);
1510 #ifdef CONFIG_IP_MULTICAST
1511 static const struct net_protocol igmp_protocol
= {
1512 .handler
= igmp_rcv
,
1517 static const struct net_protocol tcp_protocol
= {
1518 .handler
= tcp_v4_rcv
,
1519 .err_handler
= tcp_v4_err
,
1520 .gso_send_check
= tcp_v4_gso_send_check
,
1521 .gso_segment
= tcp_tso_segment
,
1522 .gro_receive
= tcp4_gro_receive
,
1523 .gro_complete
= tcp4_gro_complete
,
1528 static const struct net_protocol udp_protocol
= {
1530 .err_handler
= udp_err
,
1531 .gso_send_check
= udp4_ufo_send_check
,
1532 .gso_segment
= udp4_ufo_fragment
,
1537 static const struct net_protocol icmp_protocol
= {
1538 .handler
= icmp_rcv
,
1539 .err_handler
= ping_err
,
1544 static __net_init
int ipv4_mib_init_net(struct net
*net
)
1546 if (snmp_mib_init((void __percpu
**)net
->mib
.tcp_statistics
,
1547 sizeof(struct tcp_mib
),
1548 __alignof__(struct tcp_mib
)) < 0)
1550 if (snmp_mib_init((void __percpu
**)net
->mib
.ip_statistics
,
1551 sizeof(struct ipstats_mib
),
1552 __alignof__(struct ipstats_mib
)) < 0)
1554 if (snmp_mib_init((void __percpu
**)net
->mib
.net_statistics
,
1555 sizeof(struct linux_mib
),
1556 __alignof__(struct linux_mib
)) < 0)
1558 if (snmp_mib_init((void __percpu
**)net
->mib
.udp_statistics
,
1559 sizeof(struct udp_mib
),
1560 __alignof__(struct udp_mib
)) < 0)
1562 if (snmp_mib_init((void __percpu
**)net
->mib
.udplite_statistics
,
1563 sizeof(struct udp_mib
),
1564 __alignof__(struct udp_mib
)) < 0)
1565 goto err_udplite_mib
;
1566 if (snmp_mib_init((void __percpu
**)net
->mib
.icmp_statistics
,
1567 sizeof(struct icmp_mib
),
1568 __alignof__(struct icmp_mib
)) < 0)
1570 if (snmp_mib_init((void __percpu
**)net
->mib
.icmpmsg_statistics
,
1571 sizeof(struct icmpmsg_mib
),
1572 __alignof__(struct icmpmsg_mib
)) < 0)
1573 goto err_icmpmsg_mib
;
1579 snmp_mib_free((void __percpu
**)net
->mib
.icmp_statistics
);
1581 snmp_mib_free((void __percpu
**)net
->mib
.udplite_statistics
);
1583 snmp_mib_free((void __percpu
**)net
->mib
.udp_statistics
);
1585 snmp_mib_free((void __percpu
**)net
->mib
.net_statistics
);
1587 snmp_mib_free((void __percpu
**)net
->mib
.ip_statistics
);
1589 snmp_mib_free((void __percpu
**)net
->mib
.tcp_statistics
);
1594 static __net_exit
void ipv4_mib_exit_net(struct net
*net
)
1596 snmp_mib_free((void __percpu
**)net
->mib
.icmpmsg_statistics
);
1597 snmp_mib_free((void __percpu
**)net
->mib
.icmp_statistics
);
1598 snmp_mib_free((void __percpu
**)net
->mib
.udplite_statistics
);
1599 snmp_mib_free((void __percpu
**)net
->mib
.udp_statistics
);
1600 snmp_mib_free((void __percpu
**)net
->mib
.net_statistics
);
1601 snmp_mib_free((void __percpu
**)net
->mib
.ip_statistics
);
1602 snmp_mib_free((void __percpu
**)net
->mib
.tcp_statistics
);
1605 static __net_initdata
struct pernet_operations ipv4_mib_ops
= {
1606 .init
= ipv4_mib_init_net
,
1607 .exit
= ipv4_mib_exit_net
,
1610 static int __init
init_ipv4_mibs(void)
1612 return register_pernet_subsys(&ipv4_mib_ops
);
1615 static int ipv4_proc_init(void);
1618 * IP protocol layer initialiser
1621 static struct packet_type ip_packet_type __read_mostly
= {
1622 .type
= cpu_to_be16(ETH_P_IP
),
1624 .gso_send_check
= inet_gso_send_check
,
1625 .gso_segment
= inet_gso_segment
,
1626 .gro_receive
= inet_gro_receive
,
1627 .gro_complete
= inet_gro_complete
,
1630 static int __init
inet_init(void)
1632 struct sk_buff
*dummy_skb
;
1633 struct inet_protosw
*q
;
1634 struct list_head
*r
;
1637 BUILD_BUG_ON(sizeof(struct inet_skb_parm
) > sizeof(dummy_skb
->cb
));
1639 sysctl_local_reserved_ports
= kzalloc(65536 / 8, GFP_KERNEL
);
1640 if (!sysctl_local_reserved_ports
)
1643 rc
= proto_register(&tcp_prot
, 1);
1645 goto out_free_reserved_ports
;
1647 rc
= proto_register(&udp_prot
, 1);
1649 goto out_unregister_tcp_proto
;
1651 rc
= proto_register(&raw_prot
, 1);
1653 goto out_unregister_udp_proto
;
1655 rc
= proto_register(&ping_prot
, 1);
1657 goto out_unregister_raw_proto
;
1660 * Tell SOCKET that we are alive...
1663 (void)sock_register(&inet_family_ops
);
1665 #ifdef CONFIG_SYSCTL
1666 ip_static_sysctl_init();
1670 * Add all the base protocols.
1673 if (inet_add_protocol(&icmp_protocol
, IPPROTO_ICMP
) < 0)
1674 printk(KERN_CRIT
"inet_init: Cannot add ICMP protocol\n");
1675 if (inet_add_protocol(&udp_protocol
, IPPROTO_UDP
) < 0)
1676 printk(KERN_CRIT
"inet_init: Cannot add UDP protocol\n");
1677 if (inet_add_protocol(&tcp_protocol
, IPPROTO_TCP
) < 0)
1678 printk(KERN_CRIT
"inet_init: Cannot add TCP protocol\n");
1679 #ifdef CONFIG_IP_MULTICAST
1680 if (inet_add_protocol(&igmp_protocol
, IPPROTO_IGMP
) < 0)
1681 printk(KERN_CRIT
"inet_init: Cannot add IGMP protocol\n");
1684 /* Register the socket-side information for inet_create. */
1685 for (r
= &inetsw
[0]; r
< &inetsw
[SOCK_MAX
]; ++r
)
1688 for (q
= inetsw_array
; q
< &inetsw_array
[INETSW_ARRAY_LEN
]; ++q
)
1689 inet_register_protosw(q
);
1692 * Set the ARP module up
1698 * Set the IP module up
1705 /* Setup TCP slab cache for open requests. */
1708 /* Setup UDP memory threshold */
1711 /* Add UDP-Lite (RFC 3828) */
1712 udplite4_register();
1717 * Set the ICMP layer up
1720 if (icmp_init() < 0)
1721 panic("Failed to create the ICMP control socket.\n");
1724 * Initialise the multicast router
1726 #if defined(CONFIG_IP_MROUTE)
1728 printk(KERN_CRIT
"inet_init: Cannot init ipv4 mroute\n");
1731 * Initialise per-cpu ipv4 mibs
1734 if (init_ipv4_mibs())
1735 printk(KERN_CRIT
"inet_init: Cannot init ipv4 mibs\n");
1741 dev_add_pack(&ip_packet_type
);
1746 out_unregister_raw_proto
:
1747 proto_unregister(&raw_prot
);
1748 out_unregister_udp_proto
:
1749 proto_unregister(&udp_prot
);
1750 out_unregister_tcp_proto
:
1751 proto_unregister(&tcp_prot
);
1752 out_free_reserved_ports
:
1753 kfree(sysctl_local_reserved_ports
);
1757 fs_initcall(inet_init
);
1759 /* ------------------------------------------------------------------------ */
1761 #ifdef CONFIG_PROC_FS
1762 static int __init
ipv4_proc_init(void)
1766 if (raw_proc_init())
1768 if (tcp4_proc_init())
1770 if (udp4_proc_init())
1772 if (ping_proc_init())
1774 if (ip_misc_proc_init())
1791 #else /* CONFIG_PROC_FS */
1792 static int __init
ipv4_proc_init(void)
1796 #endif /* CONFIG_PROC_FS */
1798 MODULE_ALIAS_NETPROTO(PF_INET
);