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 /* New destruction routine */
131 void inet_sock_destruct(struct sock
*sk
)
133 struct inet_sock
*inet
= inet_sk(sk
);
135 __skb_queue_purge(&sk
->sk_receive_queue
);
136 __skb_queue_purge(&sk
->sk_error_queue
);
138 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
!= TCP_CLOSE
) {
139 printk("Attempt to release TCP socket in state %d %p\n",
143 if (!sock_flag(sk
, SOCK_DEAD
)) {
144 printk("Attempt to release alive inet socket %p\n", sk
);
148 BUG_TRAP(!atomic_read(&sk
->sk_rmem_alloc
));
149 BUG_TRAP(!atomic_read(&sk
->sk_wmem_alloc
));
150 BUG_TRAP(!sk
->sk_wmem_queued
);
151 BUG_TRAP(!sk
->sk_forward_alloc
);
154 dst_release(sk
->sk_dst_cache
);
155 sk_refcnt_debug_dec(sk
);
159 * The routines beyond this point handle the behaviour of an AF_INET
160 * socket object. Mostly it punts to the subprotocols of IP to do
165 * Automatically bind an unbound socket.
168 static int inet_autobind(struct sock
*sk
)
170 struct inet_sock
*inet
;
171 /* We may need to bind the socket. */
175 if (sk
->sk_prot
->get_port(sk
, 0)) {
179 inet
->sport
= htons(inet
->num
);
186 * Move a socket into listening state.
188 int inet_listen(struct socket
*sock
, int backlog
)
190 struct sock
*sk
= sock
->sk
;
191 unsigned char old_state
;
197 if (sock
->state
!= SS_UNCONNECTED
|| sock
->type
!= SOCK_STREAM
)
200 old_state
= sk
->sk_state
;
201 if (!((1 << old_state
) & (TCPF_CLOSE
| TCPF_LISTEN
)))
204 /* Really, if the socket is already in listen state
205 * we can only allow the backlog to be adjusted.
207 if (old_state
!= TCP_LISTEN
) {
208 err
= inet_csk_listen_start(sk
, backlog
);
212 sk
->sk_max_ack_backlog
= backlog
;
220 u32 inet_ehash_secret __read_mostly
;
221 EXPORT_SYMBOL(inet_ehash_secret
);
224 * inet_ehash_secret must be set exactly once
226 void build_ehash_secret(void)
230 get_random_bytes(&rnd
, sizeof(rnd
));
233 cmpxchg(&inet_ehash_secret
, 0, rnd
);
235 EXPORT_SYMBOL(build_ehash_secret
);
238 * Create an inet socket.
241 static int inet_create(struct socket
*sock
, int protocol
)
245 struct inet_protosw
*answer
;
246 struct inet_sock
*inet
;
247 struct proto
*answer_prot
;
248 unsigned char answer_flags
;
249 char answer_no_check
;
250 int try_loading_module
= 0;
253 if (sock
->type
!= SOCK_RAW
&&
254 sock
->type
!= SOCK_DGRAM
&&
256 build_ehash_secret();
258 sock
->state
= SS_UNCONNECTED
;
260 /* Look for the requested type/protocol pair. */
263 err
= -ESOCKTNOSUPPORT
;
265 list_for_each_rcu(p
, &inetsw
[sock
->type
]) {
266 answer
= list_entry(p
, struct inet_protosw
, list
);
268 /* Check the non-wild match. */
269 if (protocol
== answer
->protocol
) {
270 if (protocol
!= IPPROTO_IP
)
273 /* Check for the two wild cases. */
274 if (IPPROTO_IP
== protocol
) {
275 protocol
= answer
->protocol
;
278 if (IPPROTO_IP
== answer
->protocol
)
281 err
= -EPROTONOSUPPORT
;
285 if (unlikely(answer
== NULL
)) {
286 if (try_loading_module
< 2) {
289 * Be more specific, e.g. net-pf-2-proto-132-type-1
290 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
292 if (++try_loading_module
== 1)
293 request_module("net-pf-%d-proto-%d-type-%d",
294 PF_INET
, protocol
, sock
->type
);
296 * Fall back to generic, e.g. net-pf-2-proto-132
297 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
300 request_module("net-pf-%d-proto-%d",
302 goto lookup_protocol
;
308 if (answer
->capability
> 0 && !capable(answer
->capability
))
311 sock
->ops
= answer
->ops
;
312 answer_prot
= answer
->prot
;
313 answer_no_check
= answer
->no_check
;
314 answer_flags
= answer
->flags
;
317 BUG_TRAP(answer_prot
->slab
!= NULL
);
320 sk
= sk_alloc(PF_INET
, GFP_KERNEL
, answer_prot
, 1);
325 sk
->sk_no_check
= answer_no_check
;
326 if (INET_PROTOSW_REUSE
& answer_flags
)
330 inet
->is_icsk
= (INET_PROTOSW_ICSK
& answer_flags
) != 0;
332 if (SOCK_RAW
== sock
->type
) {
333 inet
->num
= protocol
;
334 if (IPPROTO_RAW
== protocol
)
338 if (ipv4_config
.no_pmtu_disc
)
339 inet
->pmtudisc
= IP_PMTUDISC_DONT
;
341 inet
->pmtudisc
= IP_PMTUDISC_WANT
;
345 sock_init_data(sock
, sk
);
347 sk
->sk_destruct
= inet_sock_destruct
;
348 sk
->sk_family
= PF_INET
;
349 sk
->sk_protocol
= protocol
;
350 sk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
356 inet
->mc_list
= NULL
;
358 sk_refcnt_debug_inc(sk
);
361 /* It assumes that any protocol which allows
362 * the user to assign a number at socket
363 * creation time automatically
366 inet
->sport
= htons(inet
->num
);
367 /* Add to protocol hash chains. */
368 sk
->sk_prot
->hash(sk
);
371 if (sk
->sk_prot
->init
) {
372 err
= sk
->sk_prot
->init(sk
);
374 sk_common_release(sk
);
385 * The peer socket should always be NULL (or else). When we call this
386 * function we are destroying the object and from then on nobody
387 * should refer to it.
389 int inet_release(struct socket
*sock
)
391 struct sock
*sk
= sock
->sk
;
396 /* Applications forget to leave groups before exiting */
397 ip_mc_drop_socket(sk
);
399 /* If linger is set, we don't return until the close
400 * is complete. Otherwise we return immediately. The
401 * actually closing is done the same either way.
403 * If the close is due to the process exiting, we never
407 if (sock_flag(sk
, SOCK_LINGER
) &&
408 !(current
->flags
& PF_EXITING
))
409 timeout
= sk
->sk_lingertime
;
411 sk
->sk_prot
->close(sk
, timeout
);
416 /* It is off by default, see below. */
417 int sysctl_ip_nonlocal_bind __read_mostly
;
419 int inet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
421 struct sockaddr_in
*addr
= (struct sockaddr_in
*)uaddr
;
422 struct sock
*sk
= sock
->sk
;
423 struct inet_sock
*inet
= inet_sk(sk
);
428 /* If the socket has its own bind function then use it. (RAW) */
429 if (sk
->sk_prot
->bind
) {
430 err
= sk
->sk_prot
->bind(sk
, uaddr
, addr_len
);
434 if (addr_len
< sizeof(struct sockaddr_in
))
437 chk_addr_ret
= inet_addr_type(addr
->sin_addr
.s_addr
);
439 /* Not specified by any standard per-se, however it breaks too
440 * many applications when removed. It is unfortunate since
441 * allowing applications to make a non-local bind solves
442 * several problems with systems using dynamic addressing.
443 * (ie. your servers still start up even if your ISDN link
444 * is temporarily down)
446 err
= -EADDRNOTAVAIL
;
447 if (!sysctl_ip_nonlocal_bind
&&
449 addr
->sin_addr
.s_addr
!= INADDR_ANY
&&
450 chk_addr_ret
!= RTN_LOCAL
&&
451 chk_addr_ret
!= RTN_MULTICAST
&&
452 chk_addr_ret
!= RTN_BROADCAST
)
455 snum
= ntohs(addr
->sin_port
);
457 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
460 /* We keep a pair of addresses. rcv_saddr is the one
461 * used by hash lookups, and saddr is used for transmit.
463 * In the BSD API these are the same except where it
464 * would be illegal to use them (multicast/broadcast) in
465 * which case the sending device address is used.
469 /* Check these errors (active socket, double bind). */
471 if (sk
->sk_state
!= TCP_CLOSE
|| inet
->num
)
472 goto out_release_sock
;
474 inet
->rcv_saddr
= inet
->saddr
= addr
->sin_addr
.s_addr
;
475 if (chk_addr_ret
== RTN_MULTICAST
|| chk_addr_ret
== RTN_BROADCAST
)
476 inet
->saddr
= 0; /* Use device */
478 /* Make sure we are allowed to bind here. */
479 if (sk
->sk_prot
->get_port(sk
, snum
)) {
480 inet
->saddr
= inet
->rcv_saddr
= 0;
482 goto out_release_sock
;
486 sk
->sk_userlocks
|= SOCK_BINDADDR_LOCK
;
488 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
489 inet
->sport
= htons(inet
->num
);
500 int inet_dgram_connect(struct socket
*sock
, struct sockaddr
* uaddr
,
501 int addr_len
, int flags
)
503 struct sock
*sk
= sock
->sk
;
505 if (uaddr
->sa_family
== AF_UNSPEC
)
506 return sk
->sk_prot
->disconnect(sk
, flags
);
508 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
510 return sk
->sk_prot
->connect(sk
, (struct sockaddr
*)uaddr
, addr_len
);
513 static long inet_wait_for_connect(struct sock
*sk
, long timeo
)
517 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
519 /* Basic assumption: if someone sets sk->sk_err, he _must_
520 * change state of the socket from TCP_SYN_*.
521 * Connect() does not allow to get error notifications
522 * without closing the socket.
524 while ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
526 timeo
= schedule_timeout(timeo
);
528 if (signal_pending(current
) || !timeo
)
530 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
532 finish_wait(sk
->sk_sleep
, &wait
);
537 * Connect to a remote host. There is regrettably still a little
538 * TCP 'magic' in here.
540 int inet_stream_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
541 int addr_len
, int flags
)
543 struct sock
*sk
= sock
->sk
;
549 if (uaddr
->sa_family
== AF_UNSPEC
) {
550 err
= sk
->sk_prot
->disconnect(sk
, flags
);
551 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
555 switch (sock
->state
) {
564 /* Fall out of switch with err, set for this state */
568 if (sk
->sk_state
!= TCP_CLOSE
)
571 err
= sk
->sk_prot
->connect(sk
, uaddr
, addr_len
);
575 sock
->state
= SS_CONNECTING
;
577 /* Just entered SS_CONNECTING state; the only
578 * difference is that return value in non-blocking
579 * case is EINPROGRESS, rather than EALREADY.
585 timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
587 if ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
588 /* Error code is set above */
589 if (!timeo
|| !inet_wait_for_connect(sk
, timeo
))
592 err
= sock_intr_errno(timeo
);
593 if (signal_pending(current
))
597 /* Connection was closed by RST, timeout, ICMP error
598 * or another process disconnected us.
600 if (sk
->sk_state
== TCP_CLOSE
)
603 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
604 * and error was received after socket entered established state.
605 * Hence, it is handled normally after connect() return successfully.
608 sock
->state
= SS_CONNECTED
;
615 err
= sock_error(sk
) ? : -ECONNABORTED
;
616 sock
->state
= SS_UNCONNECTED
;
617 if (sk
->sk_prot
->disconnect(sk
, flags
))
618 sock
->state
= SS_DISCONNECTING
;
623 * Accept a pending connection. The TCP layer now gives BSD semantics.
626 int inet_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
628 struct sock
*sk1
= sock
->sk
;
630 struct sock
*sk2
= sk1
->sk_prot
->accept(sk1
, flags
, &err
);
637 BUG_TRAP((1 << sk2
->sk_state
) &
638 (TCPF_ESTABLISHED
| TCPF_CLOSE_WAIT
| TCPF_CLOSE
));
640 sock_graft(sk2
, newsock
);
642 newsock
->state
= SS_CONNECTED
;
651 * This does both peername and sockname.
653 int inet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
654 int *uaddr_len
, int peer
)
656 struct sock
*sk
= sock
->sk
;
657 struct inet_sock
*inet
= inet_sk(sk
);
658 struct sockaddr_in
*sin
= (struct sockaddr_in
*)uaddr
;
660 sin
->sin_family
= AF_INET
;
663 (((1 << sk
->sk_state
) & (TCPF_CLOSE
| TCPF_SYN_SENT
)) &&
666 sin
->sin_port
= inet
->dport
;
667 sin
->sin_addr
.s_addr
= inet
->daddr
;
669 __be32 addr
= inet
->rcv_saddr
;
672 sin
->sin_port
= inet
->sport
;
673 sin
->sin_addr
.s_addr
= addr
;
675 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
676 *uaddr_len
= sizeof(*sin
);
680 int inet_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*msg
,
683 struct sock
*sk
= sock
->sk
;
685 /* We may need to bind the socket. */
686 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
689 return sk
->sk_prot
->sendmsg(iocb
, sk
, msg
, size
);
693 static ssize_t
inet_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
695 struct sock
*sk
= sock
->sk
;
697 /* We may need to bind the socket. */
698 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
701 if (sk
->sk_prot
->sendpage
)
702 return sk
->sk_prot
->sendpage(sk
, page
, offset
, size
, flags
);
703 return sock_no_sendpage(sock
, page
, offset
, size
, flags
);
707 int inet_shutdown(struct socket
*sock
, int how
)
709 struct sock
*sk
= sock
->sk
;
712 /* This should really check to make sure
713 * the socket is a TCP socket. (WHY AC...)
715 how
++; /* maps 0->1 has the advantage of making bit 1 rcvs and
718 if ((how
& ~SHUTDOWN_MASK
) || !how
) /* MAXINT->0 */
722 if (sock
->state
== SS_CONNECTING
) {
723 if ((1 << sk
->sk_state
) &
724 (TCPF_SYN_SENT
| TCPF_SYN_RECV
| TCPF_CLOSE
))
725 sock
->state
= SS_DISCONNECTING
;
727 sock
->state
= SS_CONNECTED
;
730 switch (sk
->sk_state
) {
733 /* Hack to wake up other listeners, who can poll for
734 POLLHUP, even on eg. unconnected UDP sockets -- RR */
736 sk
->sk_shutdown
|= how
;
737 if (sk
->sk_prot
->shutdown
)
738 sk
->sk_prot
->shutdown(sk
, how
);
741 /* Remaining two branches are temporary solution for missing
742 * close() in multithreaded environment. It is _not_ a good idea,
743 * but we have no choice until close() is repaired at VFS level.
746 if (!(how
& RCV_SHUTDOWN
))
750 err
= sk
->sk_prot
->disconnect(sk
, O_NONBLOCK
);
751 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
755 /* Wake up anyone sleeping in poll. */
756 sk
->sk_state_change(sk
);
762 * ioctl() calls you can issue on an INET socket. Most of these are
763 * device configuration and stuff and very rarely used. Some ioctls
764 * pass on to the socket itself.
766 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
767 * loads the devconfigure module does its configuring and unloads it.
768 * There's a good 20K of config code hanging around the kernel.
771 int inet_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
773 struct sock
*sk
= sock
->sk
;
778 err
= sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
781 err
= sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
786 err
= ip_rt_ioctl(cmd
, (void __user
*)arg
);
791 err
= arp_ioctl(cmd
, (void __user
*)arg
);
804 err
= devinet_ioctl(cmd
, (void __user
*)arg
);
807 if (sk
->sk_prot
->ioctl
)
808 err
= sk
->sk_prot
->ioctl(sk
, cmd
, arg
);
816 const struct proto_ops inet_stream_ops
= {
818 .owner
= THIS_MODULE
,
819 .release
= inet_release
,
821 .connect
= inet_stream_connect
,
822 .socketpair
= sock_no_socketpair
,
823 .accept
= inet_accept
,
824 .getname
= inet_getname
,
827 .listen
= inet_listen
,
828 .shutdown
= inet_shutdown
,
829 .setsockopt
= sock_common_setsockopt
,
830 .getsockopt
= sock_common_getsockopt
,
831 .sendmsg
= tcp_sendmsg
,
832 .recvmsg
= sock_common_recvmsg
,
833 .mmap
= sock_no_mmap
,
834 .sendpage
= tcp_sendpage
,
835 .splice_read
= tcp_splice_read
,
837 .compat_setsockopt
= compat_sock_common_setsockopt
,
838 .compat_getsockopt
= compat_sock_common_getsockopt
,
842 const struct proto_ops inet_dgram_ops
= {
844 .owner
= THIS_MODULE
,
845 .release
= inet_release
,
847 .connect
= inet_dgram_connect
,
848 .socketpair
= sock_no_socketpair
,
849 .accept
= sock_no_accept
,
850 .getname
= inet_getname
,
853 .listen
= sock_no_listen
,
854 .shutdown
= inet_shutdown
,
855 .setsockopt
= sock_common_setsockopt
,
856 .getsockopt
= sock_common_getsockopt
,
857 .sendmsg
= inet_sendmsg
,
858 .recvmsg
= sock_common_recvmsg
,
859 .mmap
= sock_no_mmap
,
860 .sendpage
= inet_sendpage
,
862 .compat_setsockopt
= compat_sock_common_setsockopt
,
863 .compat_getsockopt
= compat_sock_common_getsockopt
,
868 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
871 static const struct proto_ops inet_sockraw_ops
= {
873 .owner
= THIS_MODULE
,
874 .release
= inet_release
,
876 .connect
= inet_dgram_connect
,
877 .socketpair
= sock_no_socketpair
,
878 .accept
= sock_no_accept
,
879 .getname
= inet_getname
,
880 .poll
= datagram_poll
,
882 .listen
= sock_no_listen
,
883 .shutdown
= inet_shutdown
,
884 .setsockopt
= sock_common_setsockopt
,
885 .getsockopt
= sock_common_getsockopt
,
886 .sendmsg
= inet_sendmsg
,
887 .recvmsg
= sock_common_recvmsg
,
888 .mmap
= sock_no_mmap
,
889 .sendpage
= inet_sendpage
,
891 .compat_setsockopt
= compat_sock_common_setsockopt
,
892 .compat_getsockopt
= compat_sock_common_getsockopt
,
896 static struct net_proto_family inet_family_ops
= {
898 .create
= inet_create
,
899 .owner
= THIS_MODULE
,
902 /* Upon startup we insert all the elements in inetsw_array[] into
903 * the linked list inetsw.
905 static struct inet_protosw inetsw_array
[] =
909 .protocol
= IPPROTO_TCP
,
911 .ops
= &inet_stream_ops
,
914 .flags
= INET_PROTOSW_PERMANENT
|
920 .protocol
= IPPROTO_UDP
,
922 .ops
= &inet_dgram_ops
,
924 .no_check
= UDP_CSUM_DEFAULT
,
925 .flags
= INET_PROTOSW_PERMANENT
,
931 .protocol
= IPPROTO_IP
, /* wild card */
933 .ops
= &inet_sockraw_ops
,
934 .capability
= CAP_NET_RAW
,
935 .no_check
= UDP_CSUM_DEFAULT
,
936 .flags
= INET_PROTOSW_REUSE
,
940 #define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw))
942 void inet_register_protosw(struct inet_protosw
*p
)
944 struct list_head
*lh
;
945 struct inet_protosw
*answer
;
946 int protocol
= p
->protocol
;
947 struct list_head
*last_perm
;
949 spin_lock_bh(&inetsw_lock
);
951 if (p
->type
>= SOCK_MAX
)
954 /* If we are trying to override a permanent protocol, bail. */
956 last_perm
= &inetsw
[p
->type
];
957 list_for_each(lh
, &inetsw
[p
->type
]) {
958 answer
= list_entry(lh
, struct inet_protosw
, list
);
960 /* Check only the non-wild match. */
961 if (INET_PROTOSW_PERMANENT
& answer
->flags
) {
962 if (protocol
== answer
->protocol
)
972 /* Add the new entry after the last permanent entry if any, so that
973 * the new entry does not override a permanent entry when matched with
974 * a wild-card protocol. But it is allowed to override any existing
975 * non-permanent entry. This means that when we remove this entry, the
976 * system automatically returns to the old behavior.
978 list_add_rcu(&p
->list
, last_perm
);
980 spin_unlock_bh(&inetsw_lock
);
987 printk(KERN_ERR
"Attempt to override permanent protocol %d.\n",
993 "Ignoring attempt to register invalid socket type %d.\n",
998 void inet_unregister_protosw(struct inet_protosw
*p
)
1000 if (INET_PROTOSW_PERMANENT
& p
->flags
) {
1002 "Attempt to unregister permanent protocol %d.\n",
1005 spin_lock_bh(&inetsw_lock
);
1006 list_del_rcu(&p
->list
);
1007 spin_unlock_bh(&inetsw_lock
);
1014 * Shall we try to damage output packets if routing dev changes?
1017 int sysctl_ip_dynaddr __read_mostly
;
1019 static int inet_sk_reselect_saddr(struct sock
*sk
)
1021 struct inet_sock
*inet
= inet_sk(sk
);
1024 __be32 old_saddr
= inet
->saddr
;
1026 __be32 daddr
= inet
->daddr
;
1028 if (inet
->opt
&& inet
->opt
->srr
)
1029 daddr
= inet
->opt
->faddr
;
1031 /* Query new route. */
1032 err
= ip_route_connect(&rt
, daddr
, 0,
1034 sk
->sk_bound_dev_if
,
1036 inet
->sport
, inet
->dport
, sk
, 0);
1040 sk_setup_caps(sk
, &rt
->u
.dst
);
1042 new_saddr
= rt
->rt_src
;
1044 if (new_saddr
== old_saddr
)
1047 if (sysctl_ip_dynaddr
> 1) {
1048 printk(KERN_INFO
"%s(): shifting inet->"
1049 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n",
1052 NIPQUAD(new_saddr
));
1055 inet
->saddr
= inet
->rcv_saddr
= new_saddr
;
1058 * XXX The only one ugly spot where we need to
1059 * XXX really change the sockets identity after
1060 * XXX it has entered the hashes. -DaveM
1062 * Besides that, it does not check for connection
1063 * uniqueness. Wait for troubles.
1065 __sk_prot_rehash(sk
);
1069 int inet_sk_rebuild_header(struct sock
*sk
)
1071 struct inet_sock
*inet
= inet_sk(sk
);
1072 struct rtable
*rt
= (struct rtable
*)__sk_dst_check(sk
, 0);
1076 /* Route is OK, nothing to do. */
1081 daddr
= inet
->daddr
;
1082 if (inet
->opt
&& inet
->opt
->srr
)
1083 daddr
= inet
->opt
->faddr
;
1086 .oif
= sk
->sk_bound_dev_if
,
1090 .saddr
= inet
->saddr
,
1091 .tos
= RT_CONN_FLAGS(sk
),
1094 .proto
= sk
->sk_protocol
,
1097 .sport
= inet
->sport
,
1098 .dport
= inet
->dport
,
1103 security_sk_classify_flow(sk
, &fl
);
1104 err
= ip_route_output_flow(&rt
, &fl
, sk
, 0);
1107 sk_setup_caps(sk
, &rt
->u
.dst
);
1109 /* Routing failed... */
1110 sk
->sk_route_caps
= 0;
1112 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1113 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1115 if (!sysctl_ip_dynaddr
||
1116 sk
->sk_state
!= TCP_SYN_SENT
||
1117 (sk
->sk_userlocks
& SOCK_BINDADDR_LOCK
) ||
1118 (err
= inet_sk_reselect_saddr(sk
)) != 0)
1119 sk
->sk_err_soft
= -err
;
1125 EXPORT_SYMBOL(inet_sk_rebuild_header
);
1127 static int inet_gso_send_check(struct sk_buff
*skb
)
1130 struct net_protocol
*ops
;
1135 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1140 if (ihl
< sizeof(*iph
))
1143 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1146 __skb_pull(skb
, ihl
);
1147 skb_reset_transport_header(skb
);
1149 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1150 err
= -EPROTONOSUPPORT
;
1153 ops
= rcu_dereference(inet_protos
[proto
]);
1154 if (likely(ops
&& ops
->gso_send_check
))
1155 err
= ops
->gso_send_check(skb
);
1162 static struct sk_buff
*inet_gso_segment(struct sk_buff
*skb
, int features
)
1164 struct sk_buff
*segs
= ERR_PTR(-EINVAL
);
1166 struct net_protocol
*ops
;
1171 if (unlikely(skb_shinfo(skb
)->gso_type
&
1179 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1184 if (ihl
< sizeof(*iph
))
1187 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1190 __skb_pull(skb
, ihl
);
1191 skb_reset_transport_header(skb
);
1193 id
= ntohs(iph
->id
);
1194 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1195 segs
= ERR_PTR(-EPROTONOSUPPORT
);
1198 ops
= rcu_dereference(inet_protos
[proto
]);
1199 if (likely(ops
&& ops
->gso_segment
))
1200 segs
= ops
->gso_segment(skb
, features
);
1203 if (!segs
|| unlikely(IS_ERR(segs
)))
1209 iph
->id
= htons(id
++);
1210 iph
->tot_len
= htons(skb
->len
- skb
->mac_len
);
1212 iph
->check
= ip_fast_csum(skb_network_header(skb
), iph
->ihl
);
1213 } while ((skb
= skb
->next
));
1219 unsigned long snmp_fold_field(void *mib
[], int offt
)
1221 unsigned long res
= 0;
1224 for_each_possible_cpu(i
) {
1225 res
+= *(((unsigned long *) per_cpu_ptr(mib
[0], i
)) + offt
);
1226 res
+= *(((unsigned long *) per_cpu_ptr(mib
[1], i
)) + offt
);
1230 EXPORT_SYMBOL_GPL(snmp_fold_field
);
1232 int snmp_mib_init(void *ptr
[2], size_t mibsize
, size_t mibalign
)
1234 BUG_ON(ptr
== NULL
);
1235 ptr
[0] = __alloc_percpu(mibsize
);
1238 ptr
[1] = __alloc_percpu(mibsize
);
1243 free_percpu(ptr
[0]);
1248 EXPORT_SYMBOL_GPL(snmp_mib_init
);
1250 void snmp_mib_free(void *ptr
[2])
1252 BUG_ON(ptr
== NULL
);
1253 free_percpu(ptr
[0]);
1254 free_percpu(ptr
[1]);
1255 ptr
[0] = ptr
[1] = NULL
;
1257 EXPORT_SYMBOL_GPL(snmp_mib_free
);
1259 #ifdef CONFIG_IP_MULTICAST
1260 static struct net_protocol igmp_protocol
= {
1261 .handler
= igmp_rcv
,
1265 static struct net_protocol tcp_protocol
= {
1266 .handler
= tcp_v4_rcv
,
1267 .err_handler
= tcp_v4_err
,
1268 .gso_send_check
= tcp_v4_gso_send_check
,
1269 .gso_segment
= tcp_tso_segment
,
1273 static struct net_protocol udp_protocol
= {
1275 .err_handler
= udp_err
,
1279 static struct net_protocol icmp_protocol
= {
1280 .handler
= icmp_rcv
,
1283 static int __init
init_ipv4_mibs(void)
1285 if (snmp_mib_init((void **)net_statistics
,
1286 sizeof(struct linux_mib
),
1287 __alignof__(struct linux_mib
)) < 0)
1289 if (snmp_mib_init((void **)ip_statistics
,
1290 sizeof(struct ipstats_mib
),
1291 __alignof__(struct ipstats_mib
)) < 0)
1293 if (snmp_mib_init((void **)icmp_statistics
,
1294 sizeof(struct icmp_mib
),
1295 __alignof__(struct icmp_mib
)) < 0)
1297 if (snmp_mib_init((void **)tcp_statistics
,
1298 sizeof(struct tcp_mib
),
1299 __alignof__(struct tcp_mib
)) < 0)
1301 if (snmp_mib_init((void **)udp_statistics
,
1302 sizeof(struct udp_mib
),
1303 __alignof__(struct udp_mib
)) < 0)
1305 if (snmp_mib_init((void **)udplite_statistics
,
1306 sizeof(struct udp_mib
),
1307 __alignof__(struct udp_mib
)) < 0)
1308 goto err_udplite_mib
;
1315 snmp_mib_free((void **)udp_statistics
);
1317 snmp_mib_free((void **)tcp_statistics
);
1319 snmp_mib_free((void **)icmp_statistics
);
1321 snmp_mib_free((void **)ip_statistics
);
1323 snmp_mib_free((void **)net_statistics
);
1328 static int ipv4_proc_init(void);
1331 * IP protocol layer initialiser
1334 static struct packet_type ip_packet_type
= {
1335 .type
= __constant_htons(ETH_P_IP
),
1337 .gso_send_check
= inet_gso_send_check
,
1338 .gso_segment
= inet_gso_segment
,
1341 static int __init
inet_init(void)
1343 struct sk_buff
*dummy_skb
;
1344 struct inet_protosw
*q
;
1345 struct list_head
*r
;
1348 BUILD_BUG_ON(sizeof(struct inet_skb_parm
) > sizeof(dummy_skb
->cb
));
1350 rc
= proto_register(&tcp_prot
, 1);
1354 rc
= proto_register(&udp_prot
, 1);
1356 goto out_unregister_tcp_proto
;
1358 rc
= proto_register(&raw_prot
, 1);
1360 goto out_unregister_udp_proto
;
1363 * Tell SOCKET that we are alive...
1366 (void)sock_register(&inet_family_ops
);
1369 * Add all the base protocols.
1372 if (inet_add_protocol(&icmp_protocol
, IPPROTO_ICMP
) < 0)
1373 printk(KERN_CRIT
"inet_init: Cannot add ICMP protocol\n");
1374 if (inet_add_protocol(&udp_protocol
, IPPROTO_UDP
) < 0)
1375 printk(KERN_CRIT
"inet_init: Cannot add UDP protocol\n");
1376 if (inet_add_protocol(&tcp_protocol
, IPPROTO_TCP
) < 0)
1377 printk(KERN_CRIT
"inet_init: Cannot add TCP protocol\n");
1378 #ifdef CONFIG_IP_MULTICAST
1379 if (inet_add_protocol(&igmp_protocol
, IPPROTO_IGMP
) < 0)
1380 printk(KERN_CRIT
"inet_init: Cannot add IGMP protocol\n");
1383 /* Register the socket-side information for inet_create. */
1384 for (r
= &inetsw
[0]; r
< &inetsw
[SOCK_MAX
]; ++r
)
1387 for (q
= inetsw_array
; q
< &inetsw_array
[INETSW_ARRAY_LEN
]; ++q
)
1388 inet_register_protosw(q
);
1391 * Set the ARP module up
1397 * Set the IP module up
1402 tcp_v4_init(&inet_family_ops
);
1404 /* Setup TCP slab cache for open requests. */
1407 /* Add UDP-Lite (RFC 3828) */
1408 udplite4_register();
1411 * Set the ICMP layer up
1414 icmp_init(&inet_family_ops
);
1417 * Initialise the multicast router
1419 #if defined(CONFIG_IP_MROUTE)
1423 * Initialise per-cpu ipv4 mibs
1426 if (init_ipv4_mibs())
1427 printk(KERN_CRIT
"inet_init: Cannot init ipv4 mibs\n"); ;
1433 dev_add_pack(&ip_packet_type
);
1438 out_unregister_udp_proto
:
1439 proto_unregister(&udp_prot
);
1440 out_unregister_tcp_proto
:
1441 proto_unregister(&tcp_prot
);
1445 fs_initcall(inet_init
);
1447 /* ------------------------------------------------------------------------ */
1449 #ifdef CONFIG_PROC_FS
1450 static int __init
ipv4_proc_init(void)
1454 if (raw_proc_init())
1456 if (tcp4_proc_init())
1458 if (udp4_proc_init())
1460 if (fib_proc_init())
1462 if (ip_misc_proc_init())
1479 #else /* CONFIG_PROC_FS */
1480 static int __init
ipv4_proc_init(void)
1484 #endif /* CONFIG_PROC_FS */
1486 MODULE_ALIAS_NETPROTO(PF_INET
);
1488 EXPORT_SYMBOL(inet_accept
);
1489 EXPORT_SYMBOL(inet_bind
);
1490 EXPORT_SYMBOL(inet_dgram_connect
);
1491 EXPORT_SYMBOL(inet_dgram_ops
);
1492 EXPORT_SYMBOL(inet_getname
);
1493 EXPORT_SYMBOL(inet_ioctl
);
1494 EXPORT_SYMBOL(inet_listen
);
1495 EXPORT_SYMBOL(inet_register_protosw
);
1496 EXPORT_SYMBOL(inet_release
);
1497 EXPORT_SYMBOL(inet_sendmsg
);
1498 EXPORT_SYMBOL(inet_shutdown
);
1499 EXPORT_SYMBOL(inet_sock_destruct
);
1500 EXPORT_SYMBOL(inet_stream_connect
);
1501 EXPORT_SYMBOL(inet_stream_ops
);
1502 EXPORT_SYMBOL(inet_unregister_protosw
);
1503 EXPORT_SYMBOL(net_statistics
);
1504 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind
);