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>
90 #include <asm/uaccess.h>
91 #include <asm/system.h>
93 #include <linux/inet.h>
94 #include <linux/igmp.h>
95 #include <linux/inetdevice.h>
96 #include <linux/netdevice.h>
98 #include <net/protocol.h>
100 #include <net/route.h>
101 #include <net/ip_fib.h>
102 #include <net/inet_connection_sock.h>
105 #include <net/udplite.h>
106 #include <linux/skbuff.h>
107 #include <net/sock.h>
109 #include <net/icmp.h>
110 #include <net/ipip.h>
111 #include <net/inet_common.h>
112 #include <net/xfrm.h>
113 #include <net/net_namespace.h>
114 #ifdef CONFIG_IP_MROUTE
115 #include <linux/mroute.h>
118 extern void ip_mc_drop_socket(struct sock
*sk
);
120 /* The inetsw table contains everything that inet_create needs to
121 * build a new socket.
123 static struct list_head inetsw
[SOCK_MAX
];
124 static DEFINE_SPINLOCK(inetsw_lock
);
126 struct ipv4_config ipv4_config
;
128 EXPORT_SYMBOL(ipv4_config
);
130 /* New destruction routine */
132 void inet_sock_destruct(struct sock
*sk
)
134 struct inet_sock
*inet
= inet_sk(sk
);
136 __skb_queue_purge(&sk
->sk_receive_queue
);
137 __skb_queue_purge(&sk
->sk_error_queue
);
141 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
!= TCP_CLOSE
) {
142 printk("Attempt to release TCP socket in state %d %p\n",
146 if (!sock_flag(sk
, SOCK_DEAD
)) {
147 printk("Attempt to release alive inet socket %p\n", sk
);
151 WARN_ON(atomic_read(&sk
->sk_rmem_alloc
));
152 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
153 WARN_ON(sk
->sk_wmem_queued
);
154 WARN_ON(sk
->sk_forward_alloc
);
157 dst_release(sk
->sk_dst_cache
);
158 sk_refcnt_debug_dec(sk
);
162 * The routines beyond this point handle the behaviour of an AF_INET
163 * socket object. Mostly it punts to the subprotocols of IP to do
168 * Automatically bind an unbound socket.
171 static int inet_autobind(struct sock
*sk
)
173 struct inet_sock
*inet
;
174 /* We may need to bind the socket. */
178 if (sk
->sk_prot
->get_port(sk
, 0)) {
182 inet
->sport
= htons(inet
->num
);
189 * Move a socket into listening state.
191 int inet_listen(struct socket
*sock
, int backlog
)
193 struct sock
*sk
= sock
->sk
;
194 unsigned char old_state
;
200 if (sock
->state
!= SS_UNCONNECTED
|| sock
->type
!= SOCK_STREAM
)
203 old_state
= sk
->sk_state
;
204 if (!((1 << old_state
) & (TCPF_CLOSE
| TCPF_LISTEN
)))
207 /* Really, if the socket is already in listen state
208 * we can only allow the backlog to be adjusted.
210 if (old_state
!= TCP_LISTEN
) {
211 err
= inet_csk_listen_start(sk
, backlog
);
215 sk
->sk_max_ack_backlog
= backlog
;
223 u32 inet_ehash_secret __read_mostly
;
224 EXPORT_SYMBOL(inet_ehash_secret
);
227 * inet_ehash_secret must be set exactly once
228 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock
230 void build_ehash_secret(void)
234 get_random_bytes(&rnd
, sizeof(rnd
));
236 spin_lock_bh(&inetsw_lock
);
237 if (!inet_ehash_secret
)
238 inet_ehash_secret
= rnd
;
239 spin_unlock_bh(&inetsw_lock
);
241 EXPORT_SYMBOL(build_ehash_secret
);
243 static inline int inet_netns_ok(struct net
*net
, int protocol
)
246 struct net_protocol
*ipprot
;
248 if (net
== &init_net
)
251 hash
= protocol
& (MAX_INET_PROTOS
- 1);
252 ipprot
= rcu_dereference(inet_protos
[hash
]);
257 return ipprot
->netns_ok
;
261 * Create an inet socket.
264 static int inet_create(struct net
*net
, struct socket
*sock
, int protocol
)
268 struct inet_protosw
*answer
;
269 struct inet_sock
*inet
;
270 struct proto
*answer_prot
;
271 unsigned char answer_flags
;
272 char answer_no_check
;
273 int try_loading_module
= 0;
276 if (sock
->type
!= SOCK_RAW
&&
277 sock
->type
!= SOCK_DGRAM
&&
279 build_ehash_secret();
281 sock
->state
= SS_UNCONNECTED
;
283 /* Look for the requested type/protocol pair. */
286 err
= -ESOCKTNOSUPPORT
;
288 list_for_each_rcu(p
, &inetsw
[sock
->type
]) {
289 answer
= list_entry(p
, struct inet_protosw
, list
);
291 /* Check the non-wild match. */
292 if (protocol
== answer
->protocol
) {
293 if (protocol
!= IPPROTO_IP
)
296 /* Check for the two wild cases. */
297 if (IPPROTO_IP
== protocol
) {
298 protocol
= answer
->protocol
;
301 if (IPPROTO_IP
== answer
->protocol
)
304 err
= -EPROTONOSUPPORT
;
308 if (unlikely(answer
== NULL
)) {
309 if (try_loading_module
< 2) {
312 * Be more specific, e.g. net-pf-2-proto-132-type-1
313 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
315 if (++try_loading_module
== 1)
316 request_module("net-pf-%d-proto-%d-type-%d",
317 PF_INET
, protocol
, sock
->type
);
319 * Fall back to generic, e.g. net-pf-2-proto-132
320 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
323 request_module("net-pf-%d-proto-%d",
325 goto lookup_protocol
;
331 if (answer
->capability
> 0 && !capable(answer
->capability
))
335 if (!inet_netns_ok(net
, protocol
))
338 sock
->ops
= answer
->ops
;
339 answer_prot
= answer
->prot
;
340 answer_no_check
= answer
->no_check
;
341 answer_flags
= answer
->flags
;
344 WARN_ON(answer_prot
->slab
== NULL
);
347 sk
= sk_alloc(net
, PF_INET
, GFP_KERNEL
, answer_prot
);
352 sk
->sk_no_check
= answer_no_check
;
353 if (INET_PROTOSW_REUSE
& answer_flags
)
357 inet
->is_icsk
= (INET_PROTOSW_ICSK
& answer_flags
) != 0;
359 if (SOCK_RAW
== sock
->type
) {
360 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_family
= PF_INET
;
376 sk
->sk_protocol
= protocol
;
377 sk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
383 inet
->mc_list
= NULL
;
385 sk_refcnt_debug_inc(sk
);
388 /* It assumes that any protocol which allows
389 * the user to assign a number at socket
390 * creation time automatically
393 inet
->sport
= htons(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 /* Applications forget to leave groups before exiting */
424 ip_mc_drop_socket(sk
);
426 /* If linger is set, we don't return until the close
427 * is complete. Otherwise we return immediately. The
428 * actually closing is done the same either way.
430 * If the close is due to the process exiting, we never
434 if (sock_flag(sk
, SOCK_LINGER
) &&
435 !(current
->flags
& PF_EXITING
))
436 timeout
= sk
->sk_lingertime
;
438 sk
->sk_prot
->close(sk
, timeout
);
443 /* It is off by default, see below. */
444 int sysctl_ip_nonlocal_bind __read_mostly
;
446 int inet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
448 struct sockaddr_in
*addr
= (struct sockaddr_in
*)uaddr
;
449 struct sock
*sk
= sock
->sk
;
450 struct inet_sock
*inet
= inet_sk(sk
);
455 /* If the socket has its own bind function then use it. (RAW) */
456 if (sk
->sk_prot
->bind
) {
457 err
= sk
->sk_prot
->bind(sk
, uaddr
, addr_len
);
461 if (addr_len
< sizeof(struct sockaddr_in
))
464 chk_addr_ret
= inet_addr_type(sock_net(sk
), addr
->sin_addr
.s_addr
);
466 /* Not specified by any standard per-se, however it breaks too
467 * many applications when removed. It is unfortunate since
468 * allowing applications to make a non-local bind solves
469 * several problems with systems using dynamic addressing.
470 * (ie. your servers still start up even if your ISDN link
471 * is temporarily down)
473 err
= -EADDRNOTAVAIL
;
474 if (!sysctl_ip_nonlocal_bind
&&
476 addr
->sin_addr
.s_addr
!= htonl(INADDR_ANY
) &&
477 chk_addr_ret
!= RTN_LOCAL
&&
478 chk_addr_ret
!= RTN_MULTICAST
&&
479 chk_addr_ret
!= RTN_BROADCAST
)
482 snum
= ntohs(addr
->sin_port
);
484 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
487 /* We keep a pair of addresses. rcv_saddr is the one
488 * used by hash lookups, and saddr is used for transmit.
490 * In the BSD API these are the same except where it
491 * would be illegal to use them (multicast/broadcast) in
492 * which case the sending device address is used.
496 /* Check these errors (active socket, double bind). */
498 if (sk
->sk_state
!= TCP_CLOSE
|| inet
->num
)
499 goto out_release_sock
;
501 inet
->rcv_saddr
= inet
->saddr
= addr
->sin_addr
.s_addr
;
502 if (chk_addr_ret
== RTN_MULTICAST
|| chk_addr_ret
== RTN_BROADCAST
)
503 inet
->saddr
= 0; /* Use device */
505 /* Make sure we are allowed to bind here. */
506 if (sk
->sk_prot
->get_port(sk
, snum
)) {
507 inet
->saddr
= inet
->rcv_saddr
= 0;
509 goto out_release_sock
;
513 sk
->sk_userlocks
|= SOCK_BINDADDR_LOCK
;
515 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
516 inet
->sport
= htons(inet
->num
);
527 int inet_dgram_connect(struct socket
*sock
, struct sockaddr
* uaddr
,
528 int addr_len
, int flags
)
530 struct sock
*sk
= sock
->sk
;
532 if (uaddr
->sa_family
== AF_UNSPEC
)
533 return sk
->sk_prot
->disconnect(sk
, flags
);
535 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
537 return sk
->sk_prot
->connect(sk
, (struct sockaddr
*)uaddr
, addr_len
);
540 static long inet_wait_for_connect(struct sock
*sk
, long timeo
)
544 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
546 /* Basic assumption: if someone sets sk->sk_err, he _must_
547 * change state of the socket from TCP_SYN_*.
548 * Connect() does not allow to get error notifications
549 * without closing the socket.
551 while ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
553 timeo
= schedule_timeout(timeo
);
555 if (signal_pending(current
) || !timeo
)
557 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
559 finish_wait(sk
->sk_sleep
, &wait
);
564 * Connect to a remote host. There is regrettably still a little
565 * TCP 'magic' in here.
567 int inet_stream_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
568 int addr_len
, int flags
)
570 struct sock
*sk
= sock
->sk
;
576 if (uaddr
->sa_family
== AF_UNSPEC
) {
577 err
= sk
->sk_prot
->disconnect(sk
, flags
);
578 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
582 switch (sock
->state
) {
591 /* Fall out of switch with err, set for this state */
595 if (sk
->sk_state
!= TCP_CLOSE
)
598 err
= sk
->sk_prot
->connect(sk
, uaddr
, addr_len
);
602 sock
->state
= SS_CONNECTING
;
604 /* Just entered SS_CONNECTING state; the only
605 * difference is that return value in non-blocking
606 * case is EINPROGRESS, rather than EALREADY.
612 timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
614 if ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
615 /* Error code is set above */
616 if (!timeo
|| !inet_wait_for_connect(sk
, timeo
))
619 err
= sock_intr_errno(timeo
);
620 if (signal_pending(current
))
624 /* Connection was closed by RST, timeout, ICMP error
625 * or another process disconnected us.
627 if (sk
->sk_state
== TCP_CLOSE
)
630 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
631 * and error was received after socket entered established state.
632 * Hence, it is handled normally after connect() return successfully.
635 sock
->state
= SS_CONNECTED
;
642 err
= sock_error(sk
) ? : -ECONNABORTED
;
643 sock
->state
= SS_UNCONNECTED
;
644 if (sk
->sk_prot
->disconnect(sk
, flags
))
645 sock
->state
= SS_DISCONNECTING
;
650 * Accept a pending connection. The TCP layer now gives BSD semantics.
653 int inet_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
655 struct sock
*sk1
= sock
->sk
;
657 struct sock
*sk2
= sk1
->sk_prot
->accept(sk1
, flags
, &err
);
664 WARN_ON(!((1 << sk2
->sk_state
) &
665 (TCPF_ESTABLISHED
| TCPF_CLOSE_WAIT
| TCPF_CLOSE
)));
667 sock_graft(sk2
, newsock
);
669 newsock
->state
= SS_CONNECTED
;
678 * This does both peername and sockname.
680 int inet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
681 int *uaddr_len
, int peer
)
683 struct sock
*sk
= sock
->sk
;
684 struct inet_sock
*inet
= inet_sk(sk
);
685 struct sockaddr_in
*sin
= (struct sockaddr_in
*)uaddr
;
687 sin
->sin_family
= AF_INET
;
690 (((1 << sk
->sk_state
) & (TCPF_CLOSE
| TCPF_SYN_SENT
)) &&
693 sin
->sin_port
= inet
->dport
;
694 sin
->sin_addr
.s_addr
= inet
->daddr
;
696 __be32 addr
= inet
->rcv_saddr
;
699 sin
->sin_port
= inet
->sport
;
700 sin
->sin_addr
.s_addr
= addr
;
702 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
703 *uaddr_len
= sizeof(*sin
);
707 int inet_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*msg
,
710 struct sock
*sk
= sock
->sk
;
712 /* We may need to bind the socket. */
713 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
716 return sk
->sk_prot
->sendmsg(iocb
, sk
, msg
, size
);
720 static ssize_t
inet_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
722 struct sock
*sk
= sock
->sk
;
724 /* We may need to bind the socket. */
725 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
728 if (sk
->sk_prot
->sendpage
)
729 return sk
->sk_prot
->sendpage(sk
, page
, offset
, size
, flags
);
730 return sock_no_sendpage(sock
, page
, offset
, size
, flags
);
734 int inet_shutdown(struct socket
*sock
, int how
)
736 struct sock
*sk
= sock
->sk
;
739 /* This should really check to make sure
740 * the socket is a TCP socket. (WHY AC...)
742 how
++; /* maps 0->1 has the advantage of making bit 1 rcvs and
745 if ((how
& ~SHUTDOWN_MASK
) || !how
) /* MAXINT->0 */
749 if (sock
->state
== SS_CONNECTING
) {
750 if ((1 << sk
->sk_state
) &
751 (TCPF_SYN_SENT
| TCPF_SYN_RECV
| TCPF_CLOSE
))
752 sock
->state
= SS_DISCONNECTING
;
754 sock
->state
= SS_CONNECTED
;
757 switch (sk
->sk_state
) {
760 /* Hack to wake up other listeners, who can poll for
761 POLLHUP, even on eg. unconnected UDP sockets -- RR */
763 sk
->sk_shutdown
|= how
;
764 if (sk
->sk_prot
->shutdown
)
765 sk
->sk_prot
->shutdown(sk
, how
);
768 /* Remaining two branches are temporary solution for missing
769 * close() in multithreaded environment. It is _not_ a good idea,
770 * but we have no choice until close() is repaired at VFS level.
773 if (!(how
& RCV_SHUTDOWN
))
777 err
= sk
->sk_prot
->disconnect(sk
, O_NONBLOCK
);
778 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
782 /* Wake up anyone sleeping in poll. */
783 sk
->sk_state_change(sk
);
789 * ioctl() calls you can issue on an INET socket. Most of these are
790 * device configuration and stuff and very rarely used. Some ioctls
791 * pass on to the socket itself.
793 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
794 * loads the devconfigure module does its configuring and unloads it.
795 * There's a good 20K of config code hanging around the kernel.
798 int inet_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
800 struct sock
*sk
= sock
->sk
;
802 struct net
*net
= sock_net(sk
);
806 err
= sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
809 err
= sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
814 err
= ip_rt_ioctl(net
, cmd
, (void __user
*)arg
);
819 err
= arp_ioctl(net
, cmd
, (void __user
*)arg
);
832 err
= devinet_ioctl(net
, cmd
, (void __user
*)arg
);
835 if (sk
->sk_prot
->ioctl
)
836 err
= sk
->sk_prot
->ioctl(sk
, cmd
, arg
);
844 const struct proto_ops inet_stream_ops
= {
846 .owner
= THIS_MODULE
,
847 .release
= inet_release
,
849 .connect
= inet_stream_connect
,
850 .socketpair
= sock_no_socketpair
,
851 .accept
= inet_accept
,
852 .getname
= inet_getname
,
855 .listen
= inet_listen
,
856 .shutdown
= inet_shutdown
,
857 .setsockopt
= sock_common_setsockopt
,
858 .getsockopt
= sock_common_getsockopt
,
859 .sendmsg
= tcp_sendmsg
,
860 .recvmsg
= sock_common_recvmsg
,
861 .mmap
= sock_no_mmap
,
862 .sendpage
= tcp_sendpage
,
863 .splice_read
= tcp_splice_read
,
865 .compat_setsockopt
= compat_sock_common_setsockopt
,
866 .compat_getsockopt
= compat_sock_common_getsockopt
,
870 const struct proto_ops inet_dgram_ops
= {
872 .owner
= THIS_MODULE
,
873 .release
= inet_release
,
875 .connect
= inet_dgram_connect
,
876 .socketpair
= sock_no_socketpair
,
877 .accept
= sock_no_accept
,
878 .getname
= inet_getname
,
881 .listen
= sock_no_listen
,
882 .shutdown
= inet_shutdown
,
883 .setsockopt
= sock_common_setsockopt
,
884 .getsockopt
= sock_common_getsockopt
,
885 .sendmsg
= inet_sendmsg
,
886 .recvmsg
= sock_common_recvmsg
,
887 .mmap
= sock_no_mmap
,
888 .sendpage
= inet_sendpage
,
890 .compat_setsockopt
= compat_sock_common_setsockopt
,
891 .compat_getsockopt
= compat_sock_common_getsockopt
,
896 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
899 static const struct proto_ops inet_sockraw_ops
= {
901 .owner
= THIS_MODULE
,
902 .release
= inet_release
,
904 .connect
= inet_dgram_connect
,
905 .socketpair
= sock_no_socketpair
,
906 .accept
= sock_no_accept
,
907 .getname
= inet_getname
,
908 .poll
= datagram_poll
,
910 .listen
= sock_no_listen
,
911 .shutdown
= inet_shutdown
,
912 .setsockopt
= sock_common_setsockopt
,
913 .getsockopt
= sock_common_getsockopt
,
914 .sendmsg
= inet_sendmsg
,
915 .recvmsg
= sock_common_recvmsg
,
916 .mmap
= sock_no_mmap
,
917 .sendpage
= inet_sendpage
,
919 .compat_setsockopt
= compat_sock_common_setsockopt
,
920 .compat_getsockopt
= compat_sock_common_getsockopt
,
924 static struct net_proto_family inet_family_ops
= {
926 .create
= inet_create
,
927 .owner
= THIS_MODULE
,
930 /* Upon startup we insert all the elements in inetsw_array[] into
931 * the linked list inetsw.
933 static struct inet_protosw inetsw_array
[] =
937 .protocol
= IPPROTO_TCP
,
939 .ops
= &inet_stream_ops
,
942 .flags
= INET_PROTOSW_PERMANENT
|
948 .protocol
= IPPROTO_UDP
,
950 .ops
= &inet_dgram_ops
,
952 .no_check
= UDP_CSUM_DEFAULT
,
953 .flags
= INET_PROTOSW_PERMANENT
,
959 .protocol
= IPPROTO_IP
, /* wild card */
961 .ops
= &inet_sockraw_ops
,
962 .capability
= CAP_NET_RAW
,
963 .no_check
= UDP_CSUM_DEFAULT
,
964 .flags
= INET_PROTOSW_REUSE
,
968 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
970 void inet_register_protosw(struct inet_protosw
*p
)
972 struct list_head
*lh
;
973 struct inet_protosw
*answer
;
974 int protocol
= p
->protocol
;
975 struct list_head
*last_perm
;
977 spin_lock_bh(&inetsw_lock
);
979 if (p
->type
>= SOCK_MAX
)
982 /* If we are trying to override a permanent protocol, bail. */
984 last_perm
= &inetsw
[p
->type
];
985 list_for_each(lh
, &inetsw
[p
->type
]) {
986 answer
= list_entry(lh
, struct inet_protosw
, list
);
988 /* Check only the non-wild match. */
989 if (INET_PROTOSW_PERMANENT
& answer
->flags
) {
990 if (protocol
== answer
->protocol
)
1000 /* Add the new entry after the last permanent entry if any, so that
1001 * the new entry does not override a permanent entry when matched with
1002 * a wild-card protocol. But it is allowed to override any existing
1003 * non-permanent entry. This means that when we remove this entry, the
1004 * system automatically returns to the old behavior.
1006 list_add_rcu(&p
->list
, last_perm
);
1008 spin_unlock_bh(&inetsw_lock
);
1015 printk(KERN_ERR
"Attempt to override permanent protocol %d.\n",
1021 "Ignoring attempt to register invalid socket type %d.\n",
1026 void inet_unregister_protosw(struct inet_protosw
*p
)
1028 if (INET_PROTOSW_PERMANENT
& p
->flags
) {
1030 "Attempt to unregister permanent protocol %d.\n",
1033 spin_lock_bh(&inetsw_lock
);
1034 list_del_rcu(&p
->list
);
1035 spin_unlock_bh(&inetsw_lock
);
1042 * Shall we try to damage output packets if routing dev changes?
1045 int sysctl_ip_dynaddr __read_mostly
;
1047 static int inet_sk_reselect_saddr(struct sock
*sk
)
1049 struct inet_sock
*inet
= inet_sk(sk
);
1052 __be32 old_saddr
= inet
->saddr
;
1054 __be32 daddr
= inet
->daddr
;
1056 if (inet
->opt
&& inet
->opt
->srr
)
1057 daddr
= inet
->opt
->faddr
;
1059 /* Query new route. */
1060 err
= ip_route_connect(&rt
, daddr
, 0,
1062 sk
->sk_bound_dev_if
,
1064 inet
->sport
, inet
->dport
, sk
, 0);
1068 sk_setup_caps(sk
, &rt
->u
.dst
);
1070 new_saddr
= rt
->rt_src
;
1072 if (new_saddr
== old_saddr
)
1075 if (sysctl_ip_dynaddr
> 1) {
1076 printk(KERN_INFO
"%s(): shifting inet->"
1077 "saddr from " NIPQUAD_FMT
" to " NIPQUAD_FMT
"\n",
1080 NIPQUAD(new_saddr
));
1083 inet
->saddr
= inet
->rcv_saddr
= new_saddr
;
1086 * XXX The only one ugly spot where we need to
1087 * XXX really change the sockets identity after
1088 * XXX it has entered the hashes. -DaveM
1090 * Besides that, it does not check for connection
1091 * uniqueness. Wait for troubles.
1093 __sk_prot_rehash(sk
);
1097 int inet_sk_rebuild_header(struct sock
*sk
)
1099 struct inet_sock
*inet
= inet_sk(sk
);
1100 struct rtable
*rt
= (struct rtable
*)__sk_dst_check(sk
, 0);
1104 /* Route is OK, nothing to do. */
1109 daddr
= inet
->daddr
;
1110 if (inet
->opt
&& inet
->opt
->srr
)
1111 daddr
= inet
->opt
->faddr
;
1114 .oif
= sk
->sk_bound_dev_if
,
1118 .saddr
= inet
->saddr
,
1119 .tos
= RT_CONN_FLAGS(sk
),
1122 .proto
= sk
->sk_protocol
,
1125 .sport
= inet
->sport
,
1126 .dport
= inet
->dport
,
1131 security_sk_classify_flow(sk
, &fl
);
1132 err
= ip_route_output_flow(sock_net(sk
), &rt
, &fl
, sk
, 0);
1135 sk_setup_caps(sk
, &rt
->u
.dst
);
1137 /* Routing failed... */
1138 sk
->sk_route_caps
= 0;
1140 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1141 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1143 if (!sysctl_ip_dynaddr
||
1144 sk
->sk_state
!= TCP_SYN_SENT
||
1145 (sk
->sk_userlocks
& SOCK_BINDADDR_LOCK
) ||
1146 (err
= inet_sk_reselect_saddr(sk
)) != 0)
1147 sk
->sk_err_soft
= -err
;
1153 EXPORT_SYMBOL(inet_sk_rebuild_header
);
1155 static int inet_gso_send_check(struct sk_buff
*skb
)
1158 struct net_protocol
*ops
;
1163 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1168 if (ihl
< sizeof(*iph
))
1171 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1174 __skb_pull(skb
, ihl
);
1175 skb_reset_transport_header(skb
);
1177 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1178 err
= -EPROTONOSUPPORT
;
1181 ops
= rcu_dereference(inet_protos
[proto
]);
1182 if (likely(ops
&& ops
->gso_send_check
))
1183 err
= ops
->gso_send_check(skb
);
1190 static struct sk_buff
*inet_gso_segment(struct sk_buff
*skb
, int features
)
1192 struct sk_buff
*segs
= ERR_PTR(-EINVAL
);
1194 struct net_protocol
*ops
;
1199 if (!(features
& NETIF_F_V4_CSUM
))
1200 features
&= ~NETIF_F_SG
;
1202 if (unlikely(skb_shinfo(skb
)->gso_type
&
1210 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1215 if (ihl
< sizeof(*iph
))
1218 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1221 __skb_pull(skb
, ihl
);
1222 skb_reset_transport_header(skb
);
1224 id
= ntohs(iph
->id
);
1225 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1226 segs
= ERR_PTR(-EPROTONOSUPPORT
);
1229 ops
= rcu_dereference(inet_protos
[proto
]);
1230 if (likely(ops
&& ops
->gso_segment
))
1231 segs
= ops
->gso_segment(skb
, features
);
1234 if (!segs
|| IS_ERR(segs
))
1240 iph
->id
= htons(id
++);
1241 iph
->tot_len
= htons(skb
->len
- skb
->mac_len
);
1243 iph
->check
= ip_fast_csum(skb_network_header(skb
), iph
->ihl
);
1244 } while ((skb
= skb
->next
));
1250 int inet_ctl_sock_create(struct sock
**sk
, unsigned short family
,
1251 unsigned short type
, unsigned char protocol
,
1254 struct socket
*sock
;
1255 int rc
= sock_create_kern(family
, type
, protocol
, &sock
);
1259 (*sk
)->sk_allocation
= GFP_ATOMIC
;
1261 * Unhash it so that IP input processing does not even see it,
1262 * we do not wish this socket to see incoming packets.
1264 (*sk
)->sk_prot
->unhash(*sk
);
1266 sk_change_net(*sk
, net
);
1271 EXPORT_SYMBOL_GPL(inet_ctl_sock_create
);
1273 unsigned long snmp_fold_field(void *mib
[], int offt
)
1275 unsigned long res
= 0;
1278 for_each_possible_cpu(i
) {
1279 res
+= *(((unsigned long *) per_cpu_ptr(mib
[0], i
)) + offt
);
1280 res
+= *(((unsigned long *) per_cpu_ptr(mib
[1], i
)) + offt
);
1284 EXPORT_SYMBOL_GPL(snmp_fold_field
);
1286 int snmp_mib_init(void *ptr
[2], size_t mibsize
)
1288 BUG_ON(ptr
== NULL
);
1289 ptr
[0] = __alloc_percpu(mibsize
);
1292 ptr
[1] = __alloc_percpu(mibsize
);
1297 free_percpu(ptr
[0]);
1302 EXPORT_SYMBOL_GPL(snmp_mib_init
);
1304 void snmp_mib_free(void *ptr
[2])
1306 BUG_ON(ptr
== NULL
);
1307 free_percpu(ptr
[0]);
1308 free_percpu(ptr
[1]);
1309 ptr
[0] = ptr
[1] = NULL
;
1311 EXPORT_SYMBOL_GPL(snmp_mib_free
);
1313 #ifdef CONFIG_IP_MULTICAST
1314 static struct net_protocol igmp_protocol
= {
1315 .handler
= igmp_rcv
,
1319 static struct net_protocol tcp_protocol
= {
1320 .handler
= tcp_v4_rcv
,
1321 .err_handler
= tcp_v4_err
,
1322 .gso_send_check
= tcp_v4_gso_send_check
,
1323 .gso_segment
= tcp_tso_segment
,
1328 static struct net_protocol udp_protocol
= {
1330 .err_handler
= udp_err
,
1335 static struct net_protocol icmp_protocol
= {
1336 .handler
= icmp_rcv
,
1341 static __net_init
int ipv4_mib_init_net(struct net
*net
)
1343 if (snmp_mib_init((void **)net
->mib
.tcp_statistics
,
1344 sizeof(struct tcp_mib
)) < 0)
1346 if (snmp_mib_init((void **)net
->mib
.ip_statistics
,
1347 sizeof(struct ipstats_mib
)) < 0)
1349 if (snmp_mib_init((void **)net
->mib
.net_statistics
,
1350 sizeof(struct linux_mib
)) < 0)
1352 if (snmp_mib_init((void **)net
->mib
.udp_statistics
,
1353 sizeof(struct udp_mib
)) < 0)
1355 if (snmp_mib_init((void **)net
->mib
.udplite_statistics
,
1356 sizeof(struct udp_mib
)) < 0)
1357 goto err_udplite_mib
;
1358 if (snmp_mib_init((void **)net
->mib
.icmp_statistics
,
1359 sizeof(struct icmp_mib
)) < 0)
1361 if (snmp_mib_init((void **)net
->mib
.icmpmsg_statistics
,
1362 sizeof(struct icmpmsg_mib
)) < 0)
1363 goto err_icmpmsg_mib
;
1369 snmp_mib_free((void **)net
->mib
.icmp_statistics
);
1371 snmp_mib_free((void **)net
->mib
.udplite_statistics
);
1373 snmp_mib_free((void **)net
->mib
.udp_statistics
);
1375 snmp_mib_free((void **)net
->mib
.net_statistics
);
1377 snmp_mib_free((void **)net
->mib
.ip_statistics
);
1379 snmp_mib_free((void **)net
->mib
.tcp_statistics
);
1384 static __net_exit
void ipv4_mib_exit_net(struct net
*net
)
1386 snmp_mib_free((void **)net
->mib
.icmpmsg_statistics
);
1387 snmp_mib_free((void **)net
->mib
.icmp_statistics
);
1388 snmp_mib_free((void **)net
->mib
.udplite_statistics
);
1389 snmp_mib_free((void **)net
->mib
.udp_statistics
);
1390 snmp_mib_free((void **)net
->mib
.net_statistics
);
1391 snmp_mib_free((void **)net
->mib
.ip_statistics
);
1392 snmp_mib_free((void **)net
->mib
.tcp_statistics
);
1395 static __net_initdata
struct pernet_operations ipv4_mib_ops
= {
1396 .init
= ipv4_mib_init_net
,
1397 .exit
= ipv4_mib_exit_net
,
1400 static int __init
init_ipv4_mibs(void)
1402 return register_pernet_subsys(&ipv4_mib_ops
);
1405 static int ipv4_proc_init(void);
1408 * IP protocol layer initialiser
1411 static struct packet_type ip_packet_type
= {
1412 .type
= __constant_htons(ETH_P_IP
),
1414 .gso_send_check
= inet_gso_send_check
,
1415 .gso_segment
= inet_gso_segment
,
1418 static int __init
inet_init(void)
1420 struct sk_buff
*dummy_skb
;
1421 struct inet_protosw
*q
;
1422 struct list_head
*r
;
1425 BUILD_BUG_ON(sizeof(struct inet_skb_parm
) > sizeof(dummy_skb
->cb
));
1427 rc
= proto_register(&tcp_prot
, 1);
1431 rc
= proto_register(&udp_prot
, 1);
1433 goto out_unregister_tcp_proto
;
1435 rc
= proto_register(&raw_prot
, 1);
1437 goto out_unregister_udp_proto
;
1440 * Tell SOCKET that we are alive...
1443 (void)sock_register(&inet_family_ops
);
1446 * Add all the base protocols.
1449 if (inet_add_protocol(&icmp_protocol
, IPPROTO_ICMP
) < 0)
1450 printk(KERN_CRIT
"inet_init: Cannot add ICMP protocol\n");
1451 if (inet_add_protocol(&udp_protocol
, IPPROTO_UDP
) < 0)
1452 printk(KERN_CRIT
"inet_init: Cannot add UDP protocol\n");
1453 if (inet_add_protocol(&tcp_protocol
, IPPROTO_TCP
) < 0)
1454 printk(KERN_CRIT
"inet_init: Cannot add TCP protocol\n");
1455 #ifdef CONFIG_IP_MULTICAST
1456 if (inet_add_protocol(&igmp_protocol
, IPPROTO_IGMP
) < 0)
1457 printk(KERN_CRIT
"inet_init: Cannot add IGMP protocol\n");
1460 /* Register the socket-side information for inet_create. */
1461 for (r
= &inetsw
[0]; r
< &inetsw
[SOCK_MAX
]; ++r
)
1464 for (q
= inetsw_array
; q
< &inetsw_array
[INETSW_ARRAY_LEN
]; ++q
)
1465 inet_register_protosw(q
);
1468 * Set the ARP module up
1474 * Set the IP module up
1481 /* Setup TCP slab cache for open requests. */
1484 /* Setup UDP memory threshold */
1487 /* Add UDP-Lite (RFC 3828) */
1488 udplite4_register();
1491 * Set the ICMP layer up
1494 if (icmp_init() < 0)
1495 panic("Failed to create the ICMP control socket.\n");
1498 * Initialise the multicast router
1500 #if defined(CONFIG_IP_MROUTE)
1502 printk(KERN_CRIT
"inet_init: Cannot init ipv4 mroute\n");
1505 * Initialise per-cpu ipv4 mibs
1508 if (init_ipv4_mibs())
1509 printk(KERN_CRIT
"inet_init: Cannot init ipv4 mibs\n");
1515 dev_add_pack(&ip_packet_type
);
1520 out_unregister_udp_proto
:
1521 proto_unregister(&udp_prot
);
1522 out_unregister_tcp_proto
:
1523 proto_unregister(&tcp_prot
);
1527 fs_initcall(inet_init
);
1529 /* ------------------------------------------------------------------------ */
1531 #ifdef CONFIG_PROC_FS
1532 static int __init
ipv4_proc_init(void)
1536 if (raw_proc_init())
1538 if (tcp4_proc_init())
1540 if (udp4_proc_init())
1542 if (ip_misc_proc_init())
1557 #else /* CONFIG_PROC_FS */
1558 static int __init
ipv4_proc_init(void)
1562 #endif /* CONFIG_PROC_FS */
1564 MODULE_ALIAS_NETPROTO(PF_INET
);
1566 EXPORT_SYMBOL(inet_accept
);
1567 EXPORT_SYMBOL(inet_bind
);
1568 EXPORT_SYMBOL(inet_dgram_connect
);
1569 EXPORT_SYMBOL(inet_dgram_ops
);
1570 EXPORT_SYMBOL(inet_getname
);
1571 EXPORT_SYMBOL(inet_ioctl
);
1572 EXPORT_SYMBOL(inet_listen
);
1573 EXPORT_SYMBOL(inet_register_protosw
);
1574 EXPORT_SYMBOL(inet_release
);
1575 EXPORT_SYMBOL(inet_sendmsg
);
1576 EXPORT_SYMBOL(inet_shutdown
);
1577 EXPORT_SYMBOL(inet_sock_destruct
);
1578 EXPORT_SYMBOL(inet_stream_connect
);
1579 EXPORT_SYMBOL(inet_stream_ops
);
1580 EXPORT_SYMBOL(inet_unregister_protosw
);
1581 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind
);