2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * PF_INET protocol family socket handler.
8 * Version: $Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
15 * Changes (see also sock.c)
18 * Karl Knutson : Socket protocol table
19 * A.N.Kuznetsov : Socket death error in accept().
20 * John Richardson : Fix non blocking error in connect()
21 * so sockets that fail to connect
22 * don't return -EINPROGRESS.
23 * Alan Cox : Asynchronous I/O support
24 * Alan Cox : Keep correct socket pointer on sock
27 * Alan Cox : Semantics of SO_LINGER aren't state
28 * moved to close when you look carefully.
29 * With this fixed and the accept bug fixed
30 * some RPC stuff seems happier.
31 * Niibe Yutaka : 4.4BSD style write async I/O
33 * Tony Gale : Fixed reuse semantics.
34 * Alan Cox : bind() shouldn't abort existing but dead
35 * sockets. Stops FTP netin:.. I hope.
36 * Alan Cox : bind() works correctly for RAW sockets.
37 * Note that FreeBSD at least was broken
38 * in this respect so be careful with
39 * compatibility tests...
40 * Alan Cox : routing cache support
41 * Alan Cox : memzero the socket structure for
43 * Matt Day : nonblock connect error handler
44 * Alan Cox : Allow large numbers of pending sockets
45 * (eg for big web sites), but only if
46 * specifically application requested.
47 * Alan Cox : New buffering throughout IP. Used
49 * Alan Cox : New buffering now used smartly.
50 * Alan Cox : BSD rather than common sense
51 * interpretation of listen.
52 * Germano Caronni : Assorted small races.
53 * Alan Cox : sendmsg/recvmsg basic support.
54 * Alan Cox : Only sendmsg/recvmsg now supported.
55 * Alan Cox : Locked down bind (see security list).
56 * Alan Cox : Loosened bind a little.
57 * Mike McLagan : ADD/DEL DLCI Ioctls
58 * Willy Konynenberg : Transparent proxying support.
59 * David S. Miller : New socket lookup architecture.
60 * Some other random speedups.
61 * Cyrus Durgin : Cleaned up file for kmod hacks.
62 * Andi Kleen : Fix inet_stream_connect TCP race.
64 * This program is free software; you can redistribute it and/or
65 * modify it under the terms of the GNU General Public License
66 * as published by the Free Software Foundation; either version
67 * 2 of the License, or (at your option) any later version.
70 #include <linux/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>
92 #include <asm/uaccess.h>
93 #include <asm/system.h>
95 #include <linux/inet.h>
96 #include <linux/igmp.h>
97 #include <linux/inetdevice.h>
98 #include <linux/netdevice.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 <linux/skbuff.h>
109 #include <net/sock.h>
111 #include <net/icmp.h>
112 #include <net/ipip.h>
113 #include <net/inet_common.h>
114 #include <net/xfrm.h>
115 #ifdef CONFIG_IP_MROUTE
116 #include <linux/mroute.h>
119 DEFINE_SNMP_STAT(struct linux_mib
, net_statistics
) __read_mostly
;
121 extern void ip_mc_drop_socket(struct sock
*sk
);
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
;
131 EXPORT_SYMBOL(ipv4_config
);
133 /* New destruction routine */
135 void inet_sock_destruct(struct sock
*sk
)
137 struct inet_sock
*inet
= inet_sk(sk
);
139 __skb_queue_purge(&sk
->sk_receive_queue
);
140 __skb_queue_purge(&sk
->sk_error_queue
);
142 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
!= TCP_CLOSE
) {
143 printk("Attempt to release TCP socket in state %d %p\n",
147 if (!sock_flag(sk
, SOCK_DEAD
)) {
148 printk("Attempt to release alive inet socket %p\n", sk
);
152 BUG_TRAP(!atomic_read(&sk
->sk_rmem_alloc
));
153 BUG_TRAP(!atomic_read(&sk
->sk_wmem_alloc
));
154 BUG_TRAP(!sk
->sk_wmem_queued
);
155 BUG_TRAP(!sk
->sk_forward_alloc
);
158 dst_release(sk
->sk_dst_cache
);
159 sk_refcnt_debug_dec(sk
);
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. */
179 if (sk
->sk_prot
->get_port(sk
, 0)) {
183 inet
->sport
= htons(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 err
= inet_csk_listen_start(sk
, backlog
);
216 sk
->sk_max_ack_backlog
= backlog
;
224 u32 inet_ehash_secret __read_mostly
;
225 EXPORT_SYMBOL(inet_ehash_secret
);
228 * inet_ehash_secret must be set exactly once
229 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock
231 void build_ehash_secret(void)
235 get_random_bytes(&rnd
, sizeof(rnd
));
237 spin_lock_bh(&inetsw_lock
);
238 if (!inet_ehash_secret
)
239 inet_ehash_secret
= rnd
;
240 spin_unlock_bh(&inetsw_lock
);
242 EXPORT_SYMBOL(build_ehash_secret
);
245 * Create an inet socket.
248 static int inet_create(struct net
*net
, struct socket
*sock
, int protocol
)
252 struct inet_protosw
*answer
;
253 struct inet_sock
*inet
;
254 struct proto
*answer_prot
;
255 unsigned char answer_flags
;
256 char answer_no_check
;
257 int try_loading_module
= 0;
260 if (net
!= &init_net
)
261 return -EAFNOSUPPORT
;
263 if (sock
->type
!= SOCK_RAW
&&
264 sock
->type
!= SOCK_DGRAM
&&
266 build_ehash_secret();
268 sock
->state
= SS_UNCONNECTED
;
270 /* Look for the requested type/protocol pair. */
273 err
= -ESOCKTNOSUPPORT
;
275 list_for_each_rcu(p
, &inetsw
[sock
->type
]) {
276 answer
= list_entry(p
, struct inet_protosw
, list
);
278 /* Check the non-wild match. */
279 if (protocol
== answer
->protocol
) {
280 if (protocol
!= IPPROTO_IP
)
283 /* Check for the two wild cases. */
284 if (IPPROTO_IP
== protocol
) {
285 protocol
= answer
->protocol
;
288 if (IPPROTO_IP
== answer
->protocol
)
291 err
= -EPROTONOSUPPORT
;
295 if (unlikely(answer
== NULL
)) {
296 if (try_loading_module
< 2) {
299 * Be more specific, e.g. net-pf-2-proto-132-type-1
300 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
302 if (++try_loading_module
== 1)
303 request_module("net-pf-%d-proto-%d-type-%d",
304 PF_INET
, protocol
, sock
->type
);
306 * Fall back to generic, e.g. net-pf-2-proto-132
307 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
310 request_module("net-pf-%d-proto-%d",
312 goto lookup_protocol
;
318 if (answer
->capability
> 0 && !capable(answer
->capability
))
321 sock
->ops
= answer
->ops
;
322 answer_prot
= answer
->prot
;
323 answer_no_check
= answer
->no_check
;
324 answer_flags
= answer
->flags
;
327 BUG_TRAP(answer_prot
->slab
!= NULL
);
330 sk
= sk_alloc(net
, PF_INET
, GFP_KERNEL
, answer_prot
);
335 sk
->sk_no_check
= answer_no_check
;
336 if (INET_PROTOSW_REUSE
& answer_flags
)
340 inet
->is_icsk
= (INET_PROTOSW_ICSK
& answer_flags
) != 0;
342 if (SOCK_RAW
== sock
->type
) {
343 inet
->num
= protocol
;
344 if (IPPROTO_RAW
== protocol
)
348 if (ipv4_config
.no_pmtu_disc
)
349 inet
->pmtudisc
= IP_PMTUDISC_DONT
;
351 inet
->pmtudisc
= IP_PMTUDISC_WANT
;
355 sock_init_data(sock
, sk
);
357 sk
->sk_destruct
= inet_sock_destruct
;
358 sk
->sk_family
= PF_INET
;
359 sk
->sk_protocol
= protocol
;
360 sk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
366 inet
->mc_list
= NULL
;
368 sk_refcnt_debug_inc(sk
);
371 /* It assumes that any protocol which allows
372 * the user to assign a number at socket
373 * creation time automatically
376 inet
->sport
= htons(inet
->num
);
377 /* Add to protocol hash chains. */
378 sk
->sk_prot
->hash(sk
);
381 if (sk
->sk_prot
->init
) {
382 err
= sk
->sk_prot
->init(sk
);
384 sk_common_release(sk
);
395 * The peer socket should always be NULL (or else). When we call this
396 * function we are destroying the object and from then on nobody
397 * should refer to it.
399 int inet_release(struct socket
*sock
)
401 struct sock
*sk
= sock
->sk
;
406 /* Applications forget to leave groups before exiting */
407 ip_mc_drop_socket(sk
);
409 /* If linger is set, we don't return until the close
410 * is complete. Otherwise we return immediately. The
411 * actually closing is done the same either way.
413 * If the close is due to the process exiting, we never
417 if (sock_flag(sk
, SOCK_LINGER
) &&
418 !(current
->flags
& PF_EXITING
))
419 timeout
= sk
->sk_lingertime
;
421 sk
->sk_prot
->close(sk
, timeout
);
426 /* It is off by default, see below. */
427 int sysctl_ip_nonlocal_bind __read_mostly
;
429 int inet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
431 struct sockaddr_in
*addr
= (struct sockaddr_in
*)uaddr
;
432 struct sock
*sk
= sock
->sk
;
433 struct inet_sock
*inet
= inet_sk(sk
);
438 /* If the socket has its own bind function then use it. (RAW) */
439 if (sk
->sk_prot
->bind
) {
440 err
= sk
->sk_prot
->bind(sk
, uaddr
, addr_len
);
444 if (addr_len
< sizeof(struct sockaddr_in
))
447 chk_addr_ret
= inet_addr_type(addr
->sin_addr
.s_addr
);
449 /* Not specified by any standard per-se, however it breaks too
450 * many applications when removed. It is unfortunate since
451 * allowing applications to make a non-local bind solves
452 * several problems with systems using dynamic addressing.
453 * (ie. your servers still start up even if your ISDN link
454 * is temporarily down)
456 err
= -EADDRNOTAVAIL
;
457 if (!sysctl_ip_nonlocal_bind
&&
459 addr
->sin_addr
.s_addr
!= INADDR_ANY
&&
460 chk_addr_ret
!= RTN_LOCAL
&&
461 chk_addr_ret
!= RTN_MULTICAST
&&
462 chk_addr_ret
!= RTN_BROADCAST
)
465 snum
= ntohs(addr
->sin_port
);
467 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
470 /* We keep a pair of addresses. rcv_saddr is the one
471 * used by hash lookups, and saddr is used for transmit.
473 * In the BSD API these are the same except where it
474 * would be illegal to use them (multicast/broadcast) in
475 * which case the sending device address is used.
479 /* Check these errors (active socket, double bind). */
481 if (sk
->sk_state
!= TCP_CLOSE
|| inet
->num
)
482 goto out_release_sock
;
484 inet
->rcv_saddr
= inet
->saddr
= addr
->sin_addr
.s_addr
;
485 if (chk_addr_ret
== RTN_MULTICAST
|| chk_addr_ret
== RTN_BROADCAST
)
486 inet
->saddr
= 0; /* Use device */
488 /* Make sure we are allowed to bind here. */
489 if (sk
->sk_prot
->get_port(sk
, snum
)) {
490 inet
->saddr
= inet
->rcv_saddr
= 0;
492 goto out_release_sock
;
496 sk
->sk_userlocks
|= SOCK_BINDADDR_LOCK
;
498 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
499 inet
->sport
= htons(inet
->num
);
510 int inet_dgram_connect(struct socket
*sock
, struct sockaddr
* uaddr
,
511 int addr_len
, int flags
)
513 struct sock
*sk
= sock
->sk
;
515 if (uaddr
->sa_family
== AF_UNSPEC
)
516 return sk
->sk_prot
->disconnect(sk
, flags
);
518 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
520 return sk
->sk_prot
->connect(sk
, (struct sockaddr
*)uaddr
, addr_len
);
523 static long inet_wait_for_connect(struct sock
*sk
, long timeo
)
527 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
529 /* Basic assumption: if someone sets sk->sk_err, he _must_
530 * change state of the socket from TCP_SYN_*.
531 * Connect() does not allow to get error notifications
532 * without closing the socket.
534 while ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
536 timeo
= schedule_timeout(timeo
);
538 if (signal_pending(current
) || !timeo
)
540 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
542 finish_wait(sk
->sk_sleep
, &wait
);
547 * Connect to a remote host. There is regrettably still a little
548 * TCP 'magic' in here.
550 int inet_stream_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
551 int addr_len
, int flags
)
553 struct sock
*sk
= sock
->sk
;
559 if (uaddr
->sa_family
== AF_UNSPEC
) {
560 err
= sk
->sk_prot
->disconnect(sk
, flags
);
561 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
565 switch (sock
->state
) {
574 /* Fall out of switch with err, set for this state */
578 if (sk
->sk_state
!= TCP_CLOSE
)
581 err
= sk
->sk_prot
->connect(sk
, uaddr
, addr_len
);
585 sock
->state
= SS_CONNECTING
;
587 /* Just entered SS_CONNECTING state; the only
588 * difference is that return value in non-blocking
589 * case is EINPROGRESS, rather than EALREADY.
595 timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
597 if ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
598 /* Error code is set above */
599 if (!timeo
|| !inet_wait_for_connect(sk
, timeo
))
602 err
= sock_intr_errno(timeo
);
603 if (signal_pending(current
))
607 /* Connection was closed by RST, timeout, ICMP error
608 * or another process disconnected us.
610 if (sk
->sk_state
== TCP_CLOSE
)
613 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
614 * and error was received after socket entered established state.
615 * Hence, it is handled normally after connect() return successfully.
618 sock
->state
= SS_CONNECTED
;
625 err
= sock_error(sk
) ? : -ECONNABORTED
;
626 sock
->state
= SS_UNCONNECTED
;
627 if (sk
->sk_prot
->disconnect(sk
, flags
))
628 sock
->state
= SS_DISCONNECTING
;
633 * Accept a pending connection. The TCP layer now gives BSD semantics.
636 int inet_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
638 struct sock
*sk1
= sock
->sk
;
640 struct sock
*sk2
= sk1
->sk_prot
->accept(sk1
, flags
, &err
);
647 BUG_TRAP((1 << sk2
->sk_state
) &
648 (TCPF_ESTABLISHED
| TCPF_CLOSE_WAIT
| TCPF_CLOSE
));
650 sock_graft(sk2
, newsock
);
652 newsock
->state
= SS_CONNECTED
;
661 * This does both peername and sockname.
663 int inet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
664 int *uaddr_len
, int peer
)
666 struct sock
*sk
= sock
->sk
;
667 struct inet_sock
*inet
= inet_sk(sk
);
668 struct sockaddr_in
*sin
= (struct sockaddr_in
*)uaddr
;
670 sin
->sin_family
= AF_INET
;
673 (((1 << sk
->sk_state
) & (TCPF_CLOSE
| TCPF_SYN_SENT
)) &&
676 sin
->sin_port
= inet
->dport
;
677 sin
->sin_addr
.s_addr
= inet
->daddr
;
679 __be32 addr
= inet
->rcv_saddr
;
682 sin
->sin_port
= inet
->sport
;
683 sin
->sin_addr
.s_addr
= addr
;
685 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
686 *uaddr_len
= sizeof(*sin
);
690 int inet_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*msg
,
693 struct sock
*sk
= sock
->sk
;
695 /* We may need to bind the socket. */
696 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
699 return sk
->sk_prot
->sendmsg(iocb
, sk
, msg
, size
);
703 static ssize_t
inet_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
705 struct sock
*sk
= sock
->sk
;
707 /* We may need to bind the socket. */
708 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
711 if (sk
->sk_prot
->sendpage
)
712 return sk
->sk_prot
->sendpage(sk
, page
, offset
, size
, flags
);
713 return sock_no_sendpage(sock
, page
, offset
, size
, flags
);
717 int inet_shutdown(struct socket
*sock
, int how
)
719 struct sock
*sk
= sock
->sk
;
722 /* This should really check to make sure
723 * the socket is a TCP socket. (WHY AC...)
725 how
++; /* maps 0->1 has the advantage of making bit 1 rcvs and
728 if ((how
& ~SHUTDOWN_MASK
) || !how
) /* MAXINT->0 */
732 if (sock
->state
== SS_CONNECTING
) {
733 if ((1 << sk
->sk_state
) &
734 (TCPF_SYN_SENT
| TCPF_SYN_RECV
| TCPF_CLOSE
))
735 sock
->state
= SS_DISCONNECTING
;
737 sock
->state
= SS_CONNECTED
;
740 switch (sk
->sk_state
) {
743 /* Hack to wake up other listeners, who can poll for
744 POLLHUP, even on eg. unconnected UDP sockets -- RR */
746 sk
->sk_shutdown
|= how
;
747 if (sk
->sk_prot
->shutdown
)
748 sk
->sk_prot
->shutdown(sk
, how
);
751 /* Remaining two branches are temporary solution for missing
752 * close() in multithreaded environment. It is _not_ a good idea,
753 * but we have no choice until close() is repaired at VFS level.
756 if (!(how
& RCV_SHUTDOWN
))
760 err
= sk
->sk_prot
->disconnect(sk
, O_NONBLOCK
);
761 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
765 /* Wake up anyone sleeping in poll. */
766 sk
->sk_state_change(sk
);
772 * ioctl() calls you can issue on an INET socket. Most of these are
773 * device configuration and stuff and very rarely used. Some ioctls
774 * pass on to the socket itself.
776 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
777 * loads the devconfigure module does its configuring and unloads it.
778 * There's a good 20K of config code hanging around the kernel.
781 int inet_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
783 struct sock
*sk
= sock
->sk
;
788 err
= sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
791 err
= sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
796 err
= ip_rt_ioctl(cmd
, (void __user
*)arg
);
801 err
= arp_ioctl(sk
->sk_net
, cmd
, (void __user
*)arg
);
814 err
= devinet_ioctl(cmd
, (void __user
*)arg
);
817 if (sk
->sk_prot
->ioctl
)
818 err
= sk
->sk_prot
->ioctl(sk
, cmd
, arg
);
826 const struct proto_ops inet_stream_ops
= {
828 .owner
= THIS_MODULE
,
829 .release
= inet_release
,
831 .connect
= inet_stream_connect
,
832 .socketpair
= sock_no_socketpair
,
833 .accept
= inet_accept
,
834 .getname
= inet_getname
,
837 .listen
= inet_listen
,
838 .shutdown
= inet_shutdown
,
839 .setsockopt
= sock_common_setsockopt
,
840 .getsockopt
= sock_common_getsockopt
,
841 .sendmsg
= tcp_sendmsg
,
842 .recvmsg
= sock_common_recvmsg
,
843 .mmap
= sock_no_mmap
,
844 .sendpage
= tcp_sendpage
,
845 .splice_read
= tcp_splice_read
,
847 .compat_setsockopt
= compat_sock_common_setsockopt
,
848 .compat_getsockopt
= compat_sock_common_getsockopt
,
852 const struct proto_ops inet_dgram_ops
= {
854 .owner
= THIS_MODULE
,
855 .release
= inet_release
,
857 .connect
= inet_dgram_connect
,
858 .socketpair
= sock_no_socketpair
,
859 .accept
= sock_no_accept
,
860 .getname
= inet_getname
,
863 .listen
= sock_no_listen
,
864 .shutdown
= inet_shutdown
,
865 .setsockopt
= sock_common_setsockopt
,
866 .getsockopt
= sock_common_getsockopt
,
867 .sendmsg
= inet_sendmsg
,
868 .recvmsg
= sock_common_recvmsg
,
869 .mmap
= sock_no_mmap
,
870 .sendpage
= inet_sendpage
,
872 .compat_setsockopt
= compat_sock_common_setsockopt
,
873 .compat_getsockopt
= compat_sock_common_getsockopt
,
878 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
881 static const struct proto_ops inet_sockraw_ops
= {
883 .owner
= THIS_MODULE
,
884 .release
= inet_release
,
886 .connect
= inet_dgram_connect
,
887 .socketpair
= sock_no_socketpair
,
888 .accept
= sock_no_accept
,
889 .getname
= inet_getname
,
890 .poll
= datagram_poll
,
892 .listen
= sock_no_listen
,
893 .shutdown
= inet_shutdown
,
894 .setsockopt
= sock_common_setsockopt
,
895 .getsockopt
= sock_common_getsockopt
,
896 .sendmsg
= inet_sendmsg
,
897 .recvmsg
= sock_common_recvmsg
,
898 .mmap
= sock_no_mmap
,
899 .sendpage
= inet_sendpage
,
901 .compat_setsockopt
= compat_sock_common_setsockopt
,
902 .compat_getsockopt
= compat_sock_common_getsockopt
,
906 static struct net_proto_family inet_family_ops
= {
908 .create
= inet_create
,
909 .owner
= THIS_MODULE
,
912 /* Upon startup we insert all the elements in inetsw_array[] into
913 * the linked list inetsw.
915 static struct inet_protosw inetsw_array
[] =
919 .protocol
= IPPROTO_TCP
,
921 .ops
= &inet_stream_ops
,
924 .flags
= INET_PROTOSW_PERMANENT
|
930 .protocol
= IPPROTO_UDP
,
932 .ops
= &inet_dgram_ops
,
934 .no_check
= UDP_CSUM_DEFAULT
,
935 .flags
= INET_PROTOSW_PERMANENT
,
941 .protocol
= IPPROTO_IP
, /* wild card */
943 .ops
= &inet_sockraw_ops
,
944 .capability
= CAP_NET_RAW
,
945 .no_check
= UDP_CSUM_DEFAULT
,
946 .flags
= INET_PROTOSW_REUSE
,
950 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
952 void inet_register_protosw(struct inet_protosw
*p
)
954 struct list_head
*lh
;
955 struct inet_protosw
*answer
;
956 int protocol
= p
->protocol
;
957 struct list_head
*last_perm
;
959 spin_lock_bh(&inetsw_lock
);
961 if (p
->type
>= SOCK_MAX
)
964 /* If we are trying to override a permanent protocol, bail. */
966 last_perm
= &inetsw
[p
->type
];
967 list_for_each(lh
, &inetsw
[p
->type
]) {
968 answer
= list_entry(lh
, struct inet_protosw
, list
);
970 /* Check only the non-wild match. */
971 if (INET_PROTOSW_PERMANENT
& answer
->flags
) {
972 if (protocol
== answer
->protocol
)
982 /* Add the new entry after the last permanent entry if any, so that
983 * the new entry does not override a permanent entry when matched with
984 * a wild-card protocol. But it is allowed to override any existing
985 * non-permanent entry. This means that when we remove this entry, the
986 * system automatically returns to the old behavior.
988 list_add_rcu(&p
->list
, last_perm
);
990 spin_unlock_bh(&inetsw_lock
);
997 printk(KERN_ERR
"Attempt to override permanent protocol %d.\n",
1003 "Ignoring attempt to register invalid socket type %d.\n",
1008 void inet_unregister_protosw(struct inet_protosw
*p
)
1010 if (INET_PROTOSW_PERMANENT
& p
->flags
) {
1012 "Attempt to unregister permanent protocol %d.\n",
1015 spin_lock_bh(&inetsw_lock
);
1016 list_del_rcu(&p
->list
);
1017 spin_unlock_bh(&inetsw_lock
);
1024 * Shall we try to damage output packets if routing dev changes?
1027 int sysctl_ip_dynaddr __read_mostly
;
1029 static int inet_sk_reselect_saddr(struct sock
*sk
)
1031 struct inet_sock
*inet
= inet_sk(sk
);
1034 __be32 old_saddr
= inet
->saddr
;
1036 __be32 daddr
= inet
->daddr
;
1038 if (inet
->opt
&& inet
->opt
->srr
)
1039 daddr
= inet
->opt
->faddr
;
1041 /* Query new route. */
1042 err
= ip_route_connect(&rt
, daddr
, 0,
1044 sk
->sk_bound_dev_if
,
1046 inet
->sport
, inet
->dport
, sk
, 0);
1050 sk_setup_caps(sk
, &rt
->u
.dst
);
1052 new_saddr
= rt
->rt_src
;
1054 if (new_saddr
== old_saddr
)
1057 if (sysctl_ip_dynaddr
> 1) {
1058 printk(KERN_INFO
"%s(): shifting inet->"
1059 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n",
1062 NIPQUAD(new_saddr
));
1065 inet
->saddr
= inet
->rcv_saddr
= new_saddr
;
1068 * XXX The only one ugly spot where we need to
1069 * XXX really change the sockets identity after
1070 * XXX it has entered the hashes. -DaveM
1072 * Besides that, it does not check for connection
1073 * uniqueness. Wait for troubles.
1075 __sk_prot_rehash(sk
);
1079 int inet_sk_rebuild_header(struct sock
*sk
)
1081 struct inet_sock
*inet
= inet_sk(sk
);
1082 struct rtable
*rt
= (struct rtable
*)__sk_dst_check(sk
, 0);
1086 /* Route is OK, nothing to do. */
1091 daddr
= inet
->daddr
;
1092 if (inet
->opt
&& inet
->opt
->srr
)
1093 daddr
= inet
->opt
->faddr
;
1096 .oif
= sk
->sk_bound_dev_if
,
1100 .saddr
= inet
->saddr
,
1101 .tos
= RT_CONN_FLAGS(sk
),
1104 .proto
= sk
->sk_protocol
,
1107 .sport
= inet
->sport
,
1108 .dport
= inet
->dport
,
1113 security_sk_classify_flow(sk
, &fl
);
1114 err
= ip_route_output_flow(&rt
, &fl
, sk
, 0);
1117 sk_setup_caps(sk
, &rt
->u
.dst
);
1119 /* Routing failed... */
1120 sk
->sk_route_caps
= 0;
1122 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1123 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1125 if (!sysctl_ip_dynaddr
||
1126 sk
->sk_state
!= TCP_SYN_SENT
||
1127 (sk
->sk_userlocks
& SOCK_BINDADDR_LOCK
) ||
1128 (err
= inet_sk_reselect_saddr(sk
)) != 0)
1129 sk
->sk_err_soft
= -err
;
1135 EXPORT_SYMBOL(inet_sk_rebuild_header
);
1137 static int inet_gso_send_check(struct sk_buff
*skb
)
1140 struct net_protocol
*ops
;
1145 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1150 if (ihl
< sizeof(*iph
))
1153 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1156 __skb_pull(skb
, ihl
);
1157 skb_reset_transport_header(skb
);
1159 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1160 err
= -EPROTONOSUPPORT
;
1163 ops
= rcu_dereference(inet_protos
[proto
]);
1164 if (likely(ops
&& ops
->gso_send_check
))
1165 err
= ops
->gso_send_check(skb
);
1172 static struct sk_buff
*inet_gso_segment(struct sk_buff
*skb
, int features
)
1174 struct sk_buff
*segs
= ERR_PTR(-EINVAL
);
1176 struct net_protocol
*ops
;
1181 if (!(features
& NETIF_F_V4_CSUM
))
1182 features
&= ~NETIF_F_SG
;
1184 if (unlikely(skb_shinfo(skb
)->gso_type
&
1192 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1197 if (ihl
< sizeof(*iph
))
1200 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1203 __skb_pull(skb
, ihl
);
1204 skb_reset_transport_header(skb
);
1206 id
= ntohs(iph
->id
);
1207 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1208 segs
= ERR_PTR(-EPROTONOSUPPORT
);
1211 ops
= rcu_dereference(inet_protos
[proto
]);
1212 if (likely(ops
&& ops
->gso_segment
))
1213 segs
= ops
->gso_segment(skb
, features
);
1216 if (!segs
|| unlikely(IS_ERR(segs
)))
1222 iph
->id
= htons(id
++);
1223 iph
->tot_len
= htons(skb
->len
- skb
->mac_len
);
1225 iph
->check
= ip_fast_csum(skb_network_header(skb
), iph
->ihl
);
1226 } while ((skb
= skb
->next
));
1232 unsigned long snmp_fold_field(void *mib
[], int offt
)
1234 unsigned long res
= 0;
1237 for_each_possible_cpu(i
) {
1238 res
+= *(((unsigned long *) per_cpu_ptr(mib
[0], i
)) + offt
);
1239 res
+= *(((unsigned long *) per_cpu_ptr(mib
[1], i
)) + offt
);
1243 EXPORT_SYMBOL_GPL(snmp_fold_field
);
1245 int snmp_mib_init(void *ptr
[2], size_t mibsize
)
1247 BUG_ON(ptr
== NULL
);
1248 ptr
[0] = __alloc_percpu(mibsize
);
1251 ptr
[1] = __alloc_percpu(mibsize
);
1256 free_percpu(ptr
[0]);
1261 EXPORT_SYMBOL_GPL(snmp_mib_init
);
1263 void snmp_mib_free(void *ptr
[2])
1265 BUG_ON(ptr
== NULL
);
1266 free_percpu(ptr
[0]);
1267 free_percpu(ptr
[1]);
1268 ptr
[0] = ptr
[1] = NULL
;
1270 EXPORT_SYMBOL_GPL(snmp_mib_free
);
1272 #ifdef CONFIG_IP_MULTICAST
1273 static struct net_protocol igmp_protocol
= {
1274 .handler
= igmp_rcv
,
1278 static struct net_protocol tcp_protocol
= {
1279 .handler
= tcp_v4_rcv
,
1280 .err_handler
= tcp_v4_err
,
1281 .gso_send_check
= tcp_v4_gso_send_check
,
1282 .gso_segment
= tcp_tso_segment
,
1286 static struct net_protocol udp_protocol
= {
1288 .err_handler
= udp_err
,
1292 static struct net_protocol icmp_protocol
= {
1293 .handler
= icmp_rcv
,
1297 static int __init
init_ipv4_mibs(void)
1299 if (snmp_mib_init((void **)net_statistics
,
1300 sizeof(struct linux_mib
)) < 0)
1302 if (snmp_mib_init((void **)ip_statistics
,
1303 sizeof(struct ipstats_mib
)) < 0)
1305 if (snmp_mib_init((void **)icmp_statistics
,
1306 sizeof(struct icmp_mib
)) < 0)
1308 if (snmp_mib_init((void **)icmpmsg_statistics
,
1309 sizeof(struct icmpmsg_mib
)) < 0)
1310 goto err_icmpmsg_mib
;
1311 if (snmp_mib_init((void **)tcp_statistics
,
1312 sizeof(struct tcp_mib
)) < 0)
1314 if (snmp_mib_init((void **)udp_statistics
,
1315 sizeof(struct udp_mib
)) < 0)
1317 if (snmp_mib_init((void **)udplite_statistics
,
1318 sizeof(struct udp_mib
)) < 0)
1319 goto err_udplite_mib
;
1326 snmp_mib_free((void **)udp_statistics
);
1328 snmp_mib_free((void **)tcp_statistics
);
1330 snmp_mib_free((void **)icmpmsg_statistics
);
1332 snmp_mib_free((void **)icmp_statistics
);
1334 snmp_mib_free((void **)ip_statistics
);
1336 snmp_mib_free((void **)net_statistics
);
1341 static int ipv4_proc_init(void);
1344 * IP protocol layer initialiser
1347 static struct packet_type ip_packet_type
= {
1348 .type
= __constant_htons(ETH_P_IP
),
1350 .gso_send_check
= inet_gso_send_check
,
1351 .gso_segment
= inet_gso_segment
,
1354 static int __init
inet_init(void)
1356 struct sk_buff
*dummy_skb
;
1357 struct inet_protosw
*q
;
1358 struct list_head
*r
;
1361 BUILD_BUG_ON(sizeof(struct inet_skb_parm
) > sizeof(dummy_skb
->cb
));
1363 rc
= proto_register(&tcp_prot
, 1);
1367 rc
= proto_register(&udp_prot
, 1);
1369 goto out_unregister_tcp_proto
;
1371 rc
= proto_register(&raw_prot
, 1);
1373 goto out_unregister_udp_proto
;
1376 * Tell SOCKET that we are alive...
1379 (void)sock_register(&inet_family_ops
);
1382 * Add all the base protocols.
1385 if (inet_add_protocol(&icmp_protocol
, IPPROTO_ICMP
) < 0)
1386 printk(KERN_CRIT
"inet_init: Cannot add ICMP protocol\n");
1387 if (inet_add_protocol(&udp_protocol
, IPPROTO_UDP
) < 0)
1388 printk(KERN_CRIT
"inet_init: Cannot add UDP protocol\n");
1389 if (inet_add_protocol(&tcp_protocol
, IPPROTO_TCP
) < 0)
1390 printk(KERN_CRIT
"inet_init: Cannot add TCP protocol\n");
1391 #ifdef CONFIG_IP_MULTICAST
1392 if (inet_add_protocol(&igmp_protocol
, IPPROTO_IGMP
) < 0)
1393 printk(KERN_CRIT
"inet_init: Cannot add IGMP protocol\n");
1396 /* Register the socket-side information for inet_create. */
1397 for (r
= &inetsw
[0]; r
< &inetsw
[SOCK_MAX
]; ++r
)
1400 for (q
= inetsw_array
; q
< &inetsw_array
[INETSW_ARRAY_LEN
]; ++q
)
1401 inet_register_protosw(q
);
1404 * Set the ARP module up
1410 * Set the IP module up
1415 tcp_v4_init(&inet_family_ops
);
1417 /* Setup TCP slab cache for open requests. */
1420 /* Add UDP-Lite (RFC 3828) */
1421 udplite4_register();
1424 * Set the ICMP layer up
1427 icmp_init(&inet_family_ops
);
1430 * Initialise the multicast router
1432 #if defined(CONFIG_IP_MROUTE)
1436 * Initialise per-cpu ipv4 mibs
1439 if (init_ipv4_mibs())
1440 printk(KERN_CRIT
"inet_init: Cannot init ipv4 mibs\n"); ;
1446 dev_add_pack(&ip_packet_type
);
1451 out_unregister_udp_proto
:
1452 proto_unregister(&udp_prot
);
1453 out_unregister_tcp_proto
:
1454 proto_unregister(&tcp_prot
);
1458 fs_initcall(inet_init
);
1460 /* ------------------------------------------------------------------------ */
1462 #ifdef CONFIG_PROC_FS
1463 static int __init
ipv4_proc_init(void)
1467 if (raw_proc_init())
1469 if (tcp4_proc_init())
1471 if (udp4_proc_init())
1473 if (fib_proc_init())
1475 if (ip_misc_proc_init())
1492 #else /* CONFIG_PROC_FS */
1493 static int __init
ipv4_proc_init(void)
1497 #endif /* CONFIG_PROC_FS */
1499 MODULE_ALIAS_NETPROTO(PF_INET
);
1501 EXPORT_SYMBOL(inet_accept
);
1502 EXPORT_SYMBOL(inet_bind
);
1503 EXPORT_SYMBOL(inet_dgram_connect
);
1504 EXPORT_SYMBOL(inet_dgram_ops
);
1505 EXPORT_SYMBOL(inet_getname
);
1506 EXPORT_SYMBOL(inet_ioctl
);
1507 EXPORT_SYMBOL(inet_listen
);
1508 EXPORT_SYMBOL(inet_register_protosw
);
1509 EXPORT_SYMBOL(inet_release
);
1510 EXPORT_SYMBOL(inet_sendmsg
);
1511 EXPORT_SYMBOL(inet_shutdown
);
1512 EXPORT_SYMBOL(inet_sock_destruct
);
1513 EXPORT_SYMBOL(inet_stream_connect
);
1514 EXPORT_SYMBOL(inet_stream_ops
);
1515 EXPORT_SYMBOL(inet_unregister_protosw
);
1516 EXPORT_SYMBOL(net_statistics
);
1517 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind
);