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 #ifdef CONFIG_IP_MROUTE
114 #include <linux/mroute.h>
117 DEFINE_SNMP_STAT(struct linux_mib
, net_statistics
) __read_mostly
;
119 extern void ip_mc_drop_socket(struct sock
*sk
);
121 /* The inetsw table contains everything that inet_create needs to
122 * build a new socket.
124 static struct list_head inetsw
[SOCK_MAX
];
125 static DEFINE_SPINLOCK(inetsw_lock
);
127 struct ipv4_config ipv4_config
;
129 EXPORT_SYMBOL(ipv4_config
);
131 /* New destruction routine */
133 void inet_sock_destruct(struct sock
*sk
)
135 struct inet_sock
*inet
= inet_sk(sk
);
137 __skb_queue_purge(&sk
->sk_receive_queue
);
138 __skb_queue_purge(&sk
->sk_error_queue
);
142 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
!= TCP_CLOSE
) {
143 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
);
244 static inline int inet_netns_ok(struct net
*net
, int protocol
)
247 struct net_protocol
*ipprot
;
249 if (net
== &init_net
)
252 hash
= protocol
& (MAX_INET_PROTOS
- 1);
253 ipprot
= rcu_dereference(inet_protos
[hash
]);
258 return ipprot
->netns_ok
;
262 * Create an inet socket.
265 static int inet_create(struct net
*net
, struct socket
*sock
, int protocol
)
269 struct inet_protosw
*answer
;
270 struct inet_sock
*inet
;
271 struct proto
*answer_prot
;
272 unsigned char answer_flags
;
273 char answer_no_check
;
274 int try_loading_module
= 0;
277 if (sock
->type
!= SOCK_RAW
&&
278 sock
->type
!= SOCK_DGRAM
&&
280 build_ehash_secret();
282 sock
->state
= SS_UNCONNECTED
;
284 /* Look for the requested type/protocol pair. */
287 err
= -ESOCKTNOSUPPORT
;
289 list_for_each_rcu(p
, &inetsw
[sock
->type
]) {
290 answer
= list_entry(p
, struct inet_protosw
, list
);
292 /* Check the non-wild match. */
293 if (protocol
== answer
->protocol
) {
294 if (protocol
!= IPPROTO_IP
)
297 /* Check for the two wild cases. */
298 if (IPPROTO_IP
== protocol
) {
299 protocol
= answer
->protocol
;
302 if (IPPROTO_IP
== answer
->protocol
)
305 err
= -EPROTONOSUPPORT
;
309 if (unlikely(answer
== NULL
)) {
310 if (try_loading_module
< 2) {
313 * Be more specific, e.g. net-pf-2-proto-132-type-1
314 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
316 if (++try_loading_module
== 1)
317 request_module("net-pf-%d-proto-%d-type-%d",
318 PF_INET
, protocol
, sock
->type
);
320 * Fall back to generic, e.g. net-pf-2-proto-132
321 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
324 request_module("net-pf-%d-proto-%d",
326 goto lookup_protocol
;
332 if (answer
->capability
> 0 && !capable(answer
->capability
))
336 if (!inet_netns_ok(net
, protocol
))
339 sock
->ops
= answer
->ops
;
340 answer_prot
= answer
->prot
;
341 answer_no_check
= answer
->no_check
;
342 answer_flags
= answer
->flags
;
345 BUG_TRAP(answer_prot
->slab
!= NULL
);
348 sk
= sk_alloc(net
, PF_INET
, GFP_KERNEL
, answer_prot
);
353 sk
->sk_no_check
= answer_no_check
;
354 if (INET_PROTOSW_REUSE
& answer_flags
)
358 inet
->is_icsk
= (INET_PROTOSW_ICSK
& answer_flags
) != 0;
360 if (SOCK_RAW
== sock
->type
) {
361 inet
->num
= protocol
;
362 if (IPPROTO_RAW
== protocol
)
366 if (ipv4_config
.no_pmtu_disc
)
367 inet
->pmtudisc
= IP_PMTUDISC_DONT
;
369 inet
->pmtudisc
= IP_PMTUDISC_WANT
;
373 sock_init_data(sock
, sk
);
375 sk
->sk_destruct
= inet_sock_destruct
;
376 sk
->sk_family
= PF_INET
;
377 sk
->sk_protocol
= protocol
;
378 sk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
384 inet
->mc_list
= NULL
;
386 sk_refcnt_debug_inc(sk
);
389 /* It assumes that any protocol which allows
390 * the user to assign a number at socket
391 * creation time automatically
394 inet
->sport
= htons(inet
->num
);
395 /* Add to protocol hash chains. */
396 sk
->sk_prot
->hash(sk
);
399 if (sk
->sk_prot
->init
) {
400 err
= sk
->sk_prot
->init(sk
);
402 sk_common_release(sk
);
413 * The peer socket should always be NULL (or else). When we call this
414 * function we are destroying the object and from then on nobody
415 * should refer to it.
417 int inet_release(struct socket
*sock
)
419 struct sock
*sk
= sock
->sk
;
424 /* Applications forget to leave groups before exiting */
425 ip_mc_drop_socket(sk
);
427 /* If linger is set, we don't return until the close
428 * is complete. Otherwise we return immediately. The
429 * actually closing is done the same either way.
431 * If the close is due to the process exiting, we never
435 if (sock_flag(sk
, SOCK_LINGER
) &&
436 !(current
->flags
& PF_EXITING
))
437 timeout
= sk
->sk_lingertime
;
439 sk
->sk_prot
->close(sk
, timeout
);
444 /* It is off by default, see below. */
445 int sysctl_ip_nonlocal_bind __read_mostly
;
447 int inet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
449 struct sockaddr_in
*addr
= (struct sockaddr_in
*)uaddr
;
450 struct sock
*sk
= sock
->sk
;
451 struct inet_sock
*inet
= inet_sk(sk
);
456 /* If the socket has its own bind function then use it. (RAW) */
457 if (sk
->sk_prot
->bind
) {
458 err
= sk
->sk_prot
->bind(sk
, uaddr
, addr_len
);
462 if (addr_len
< sizeof(struct sockaddr_in
))
465 chk_addr_ret
= inet_addr_type(sock_net(sk
), addr
->sin_addr
.s_addr
);
467 /* Not specified by any standard per-se, however it breaks too
468 * many applications when removed. It is unfortunate since
469 * allowing applications to make a non-local bind solves
470 * several problems with systems using dynamic addressing.
471 * (ie. your servers still start up even if your ISDN link
472 * is temporarily down)
474 err
= -EADDRNOTAVAIL
;
475 if (!sysctl_ip_nonlocal_bind
&&
477 addr
->sin_addr
.s_addr
!= htonl(INADDR_ANY
) &&
478 chk_addr_ret
!= RTN_LOCAL
&&
479 chk_addr_ret
!= RTN_MULTICAST
&&
480 chk_addr_ret
!= RTN_BROADCAST
)
483 snum
= ntohs(addr
->sin_port
);
485 if (snum
&& snum
< PROT_SOCK
&& !capable(CAP_NET_BIND_SERVICE
))
488 /* We keep a pair of addresses. rcv_saddr is the one
489 * used by hash lookups, and saddr is used for transmit.
491 * In the BSD API these are the same except where it
492 * would be illegal to use them (multicast/broadcast) in
493 * which case the sending device address is used.
497 /* Check these errors (active socket, double bind). */
499 if (sk
->sk_state
!= TCP_CLOSE
|| inet
->num
)
500 goto out_release_sock
;
502 inet
->rcv_saddr
= inet
->saddr
= addr
->sin_addr
.s_addr
;
503 if (chk_addr_ret
== RTN_MULTICAST
|| chk_addr_ret
== RTN_BROADCAST
)
504 inet
->saddr
= 0; /* Use device */
506 /* Make sure we are allowed to bind here. */
507 if (sk
->sk_prot
->get_port(sk
, snum
)) {
508 inet
->saddr
= inet
->rcv_saddr
= 0;
510 goto out_release_sock
;
514 sk
->sk_userlocks
|= SOCK_BINDADDR_LOCK
;
516 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
517 inet
->sport
= htons(inet
->num
);
528 int inet_dgram_connect(struct socket
*sock
, struct sockaddr
* uaddr
,
529 int addr_len
, int flags
)
531 struct sock
*sk
= sock
->sk
;
533 if (uaddr
->sa_family
== AF_UNSPEC
)
534 return sk
->sk_prot
->disconnect(sk
, flags
);
536 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
538 return sk
->sk_prot
->connect(sk
, (struct sockaddr
*)uaddr
, addr_len
);
541 static long inet_wait_for_connect(struct sock
*sk
, long timeo
)
545 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
547 /* Basic assumption: if someone sets sk->sk_err, he _must_
548 * change state of the socket from TCP_SYN_*.
549 * Connect() does not allow to get error notifications
550 * without closing the socket.
552 while ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
554 timeo
= schedule_timeout(timeo
);
556 if (signal_pending(current
) || !timeo
)
558 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
560 finish_wait(sk
->sk_sleep
, &wait
);
565 * Connect to a remote host. There is regrettably still a little
566 * TCP 'magic' in here.
568 int inet_stream_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
569 int addr_len
, int flags
)
571 struct sock
*sk
= sock
->sk
;
577 if (uaddr
->sa_family
== AF_UNSPEC
) {
578 err
= sk
->sk_prot
->disconnect(sk
, flags
);
579 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
583 switch (sock
->state
) {
592 /* Fall out of switch with err, set for this state */
596 if (sk
->sk_state
!= TCP_CLOSE
)
599 err
= sk
->sk_prot
->connect(sk
, uaddr
, addr_len
);
603 sock
->state
= SS_CONNECTING
;
605 /* Just entered SS_CONNECTING state; the only
606 * difference is that return value in non-blocking
607 * case is EINPROGRESS, rather than EALREADY.
613 timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
615 if ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
616 /* Error code is set above */
617 if (!timeo
|| !inet_wait_for_connect(sk
, timeo
))
620 err
= sock_intr_errno(timeo
);
621 if (signal_pending(current
))
625 /* Connection was closed by RST, timeout, ICMP error
626 * or another process disconnected us.
628 if (sk
->sk_state
== TCP_CLOSE
)
631 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
632 * and error was received after socket entered established state.
633 * Hence, it is handled normally after connect() return successfully.
636 sock
->state
= SS_CONNECTED
;
643 err
= sock_error(sk
) ? : -ECONNABORTED
;
644 sock
->state
= SS_UNCONNECTED
;
645 if (sk
->sk_prot
->disconnect(sk
, flags
))
646 sock
->state
= SS_DISCONNECTING
;
651 * Accept a pending connection. The TCP layer now gives BSD semantics.
654 int inet_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
656 struct sock
*sk1
= sock
->sk
;
658 struct sock
*sk2
= sk1
->sk_prot
->accept(sk1
, flags
, &err
);
665 BUG_TRAP((1 << sk2
->sk_state
) &
666 (TCPF_ESTABLISHED
| TCPF_CLOSE_WAIT
| TCPF_CLOSE
));
668 sock_graft(sk2
, newsock
);
670 newsock
->state
= SS_CONNECTED
;
679 * This does both peername and sockname.
681 int inet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
682 int *uaddr_len
, int peer
)
684 struct sock
*sk
= sock
->sk
;
685 struct inet_sock
*inet
= inet_sk(sk
);
686 struct sockaddr_in
*sin
= (struct sockaddr_in
*)uaddr
;
688 sin
->sin_family
= AF_INET
;
691 (((1 << sk
->sk_state
) & (TCPF_CLOSE
| TCPF_SYN_SENT
)) &&
694 sin
->sin_port
= inet
->dport
;
695 sin
->sin_addr
.s_addr
= inet
->daddr
;
697 __be32 addr
= inet
->rcv_saddr
;
700 sin
->sin_port
= inet
->sport
;
701 sin
->sin_addr
.s_addr
= addr
;
703 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
704 *uaddr_len
= sizeof(*sin
);
708 int inet_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*msg
,
711 struct sock
*sk
= sock
->sk
;
713 /* We may need to bind the socket. */
714 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
717 return sk
->sk_prot
->sendmsg(iocb
, sk
, msg
, size
);
721 static ssize_t
inet_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
723 struct sock
*sk
= sock
->sk
;
725 /* We may need to bind the socket. */
726 if (!inet_sk(sk
)->num
&& inet_autobind(sk
))
729 if (sk
->sk_prot
->sendpage
)
730 return sk
->sk_prot
->sendpage(sk
, page
, offset
, size
, flags
);
731 return sock_no_sendpage(sock
, page
, offset
, size
, flags
);
735 int inet_shutdown(struct socket
*sock
, int how
)
737 struct sock
*sk
= sock
->sk
;
740 /* This should really check to make sure
741 * the socket is a TCP socket. (WHY AC...)
743 how
++; /* maps 0->1 has the advantage of making bit 1 rcvs and
746 if ((how
& ~SHUTDOWN_MASK
) || !how
) /* MAXINT->0 */
750 if (sock
->state
== SS_CONNECTING
) {
751 if ((1 << sk
->sk_state
) &
752 (TCPF_SYN_SENT
| TCPF_SYN_RECV
| TCPF_CLOSE
))
753 sock
->state
= SS_DISCONNECTING
;
755 sock
->state
= SS_CONNECTED
;
758 switch (sk
->sk_state
) {
761 /* Hack to wake up other listeners, who can poll for
762 POLLHUP, even on eg. unconnected UDP sockets -- RR */
764 sk
->sk_shutdown
|= how
;
765 if (sk
->sk_prot
->shutdown
)
766 sk
->sk_prot
->shutdown(sk
, how
);
769 /* Remaining two branches are temporary solution for missing
770 * close() in multithreaded environment. It is _not_ a good idea,
771 * but we have no choice until close() is repaired at VFS level.
774 if (!(how
& RCV_SHUTDOWN
))
778 err
= sk
->sk_prot
->disconnect(sk
, O_NONBLOCK
);
779 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
783 /* Wake up anyone sleeping in poll. */
784 sk
->sk_state_change(sk
);
790 * ioctl() calls you can issue on an INET socket. Most of these are
791 * device configuration and stuff and very rarely used. Some ioctls
792 * pass on to the socket itself.
794 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
795 * loads the devconfigure module does its configuring and unloads it.
796 * There's a good 20K of config code hanging around the kernel.
799 int inet_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
801 struct sock
*sk
= sock
->sk
;
803 struct net
*net
= sock_net(sk
);
807 err
= sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
810 err
= sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
815 err
= ip_rt_ioctl(net
, cmd
, (void __user
*)arg
);
820 err
= arp_ioctl(net
, cmd
, (void __user
*)arg
);
833 err
= devinet_ioctl(net
, cmd
, (void __user
*)arg
);
836 if (sk
->sk_prot
->ioctl
)
837 err
= sk
->sk_prot
->ioctl(sk
, cmd
, arg
);
845 const struct proto_ops inet_stream_ops
= {
847 .owner
= THIS_MODULE
,
848 .release
= inet_release
,
850 .connect
= inet_stream_connect
,
851 .socketpair
= sock_no_socketpair
,
852 .accept
= inet_accept
,
853 .getname
= inet_getname
,
856 .listen
= inet_listen
,
857 .shutdown
= inet_shutdown
,
858 .setsockopt
= sock_common_setsockopt
,
859 .getsockopt
= sock_common_getsockopt
,
860 .sendmsg
= tcp_sendmsg
,
861 .recvmsg
= sock_common_recvmsg
,
862 .mmap
= sock_no_mmap
,
863 .sendpage
= tcp_sendpage
,
864 .splice_read
= tcp_splice_read
,
866 .compat_setsockopt
= compat_sock_common_setsockopt
,
867 .compat_getsockopt
= compat_sock_common_getsockopt
,
871 const struct proto_ops inet_dgram_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
,
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
,
897 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
900 static const struct proto_ops inet_sockraw_ops
= {
902 .owner
= THIS_MODULE
,
903 .release
= inet_release
,
905 .connect
= inet_dgram_connect
,
906 .socketpair
= sock_no_socketpair
,
907 .accept
= sock_no_accept
,
908 .getname
= inet_getname
,
909 .poll
= datagram_poll
,
911 .listen
= sock_no_listen
,
912 .shutdown
= inet_shutdown
,
913 .setsockopt
= sock_common_setsockopt
,
914 .getsockopt
= sock_common_getsockopt
,
915 .sendmsg
= inet_sendmsg
,
916 .recvmsg
= sock_common_recvmsg
,
917 .mmap
= sock_no_mmap
,
918 .sendpage
= inet_sendpage
,
920 .compat_setsockopt
= compat_sock_common_setsockopt
,
921 .compat_getsockopt
= compat_sock_common_getsockopt
,
925 static struct net_proto_family inet_family_ops
= {
927 .create
= inet_create
,
928 .owner
= THIS_MODULE
,
931 /* Upon startup we insert all the elements in inetsw_array[] into
932 * the linked list inetsw.
934 static struct inet_protosw inetsw_array
[] =
938 .protocol
= IPPROTO_TCP
,
940 .ops
= &inet_stream_ops
,
943 .flags
= INET_PROTOSW_PERMANENT
|
949 .protocol
= IPPROTO_UDP
,
951 .ops
= &inet_dgram_ops
,
953 .no_check
= UDP_CSUM_DEFAULT
,
954 .flags
= INET_PROTOSW_PERMANENT
,
960 .protocol
= IPPROTO_IP
, /* wild card */
962 .ops
= &inet_sockraw_ops
,
963 .capability
= CAP_NET_RAW
,
964 .no_check
= UDP_CSUM_DEFAULT
,
965 .flags
= INET_PROTOSW_REUSE
,
969 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
971 void inet_register_protosw(struct inet_protosw
*p
)
973 struct list_head
*lh
;
974 struct inet_protosw
*answer
;
975 int protocol
= p
->protocol
;
976 struct list_head
*last_perm
;
978 spin_lock_bh(&inetsw_lock
);
980 if (p
->type
>= SOCK_MAX
)
983 /* If we are trying to override a permanent protocol, bail. */
985 last_perm
= &inetsw
[p
->type
];
986 list_for_each(lh
, &inetsw
[p
->type
]) {
987 answer
= list_entry(lh
, struct inet_protosw
, list
);
989 /* Check only the non-wild match. */
990 if (INET_PROTOSW_PERMANENT
& answer
->flags
) {
991 if (protocol
== answer
->protocol
)
1001 /* Add the new entry after the last permanent entry if any, so that
1002 * the new entry does not override a permanent entry when matched with
1003 * a wild-card protocol. But it is allowed to override any existing
1004 * non-permanent entry. This means that when we remove this entry, the
1005 * system automatically returns to the old behavior.
1007 list_add_rcu(&p
->list
, last_perm
);
1009 spin_unlock_bh(&inetsw_lock
);
1016 printk(KERN_ERR
"Attempt to override permanent protocol %d.\n",
1022 "Ignoring attempt to register invalid socket type %d.\n",
1027 void inet_unregister_protosw(struct inet_protosw
*p
)
1029 if (INET_PROTOSW_PERMANENT
& p
->flags
) {
1031 "Attempt to unregister permanent protocol %d.\n",
1034 spin_lock_bh(&inetsw_lock
);
1035 list_del_rcu(&p
->list
);
1036 spin_unlock_bh(&inetsw_lock
);
1043 * Shall we try to damage output packets if routing dev changes?
1046 int sysctl_ip_dynaddr __read_mostly
;
1048 static int inet_sk_reselect_saddr(struct sock
*sk
)
1050 struct inet_sock
*inet
= inet_sk(sk
);
1053 __be32 old_saddr
= inet
->saddr
;
1055 __be32 daddr
= inet
->daddr
;
1057 if (inet
->opt
&& inet
->opt
->srr
)
1058 daddr
= inet
->opt
->faddr
;
1060 /* Query new route. */
1061 err
= ip_route_connect(&rt
, daddr
, 0,
1063 sk
->sk_bound_dev_if
,
1065 inet
->sport
, inet
->dport
, sk
, 0);
1069 sk_setup_caps(sk
, &rt
->u
.dst
);
1071 new_saddr
= rt
->rt_src
;
1073 if (new_saddr
== old_saddr
)
1076 if (sysctl_ip_dynaddr
> 1) {
1077 printk(KERN_INFO
"%s(): shifting inet->"
1078 "saddr from " NIPQUAD_FMT
" to " NIPQUAD_FMT
"\n",
1081 NIPQUAD(new_saddr
));
1084 inet
->saddr
= inet
->rcv_saddr
= new_saddr
;
1087 * XXX The only one ugly spot where we need to
1088 * XXX really change the sockets identity after
1089 * XXX it has entered the hashes. -DaveM
1091 * Besides that, it does not check for connection
1092 * uniqueness. Wait for troubles.
1094 __sk_prot_rehash(sk
);
1098 int inet_sk_rebuild_header(struct sock
*sk
)
1100 struct inet_sock
*inet
= inet_sk(sk
);
1101 struct rtable
*rt
= (struct rtable
*)__sk_dst_check(sk
, 0);
1105 /* Route is OK, nothing to do. */
1110 daddr
= inet
->daddr
;
1111 if (inet
->opt
&& inet
->opt
->srr
)
1112 daddr
= inet
->opt
->faddr
;
1115 .oif
= sk
->sk_bound_dev_if
,
1119 .saddr
= inet
->saddr
,
1120 .tos
= RT_CONN_FLAGS(sk
),
1123 .proto
= sk
->sk_protocol
,
1126 .sport
= inet
->sport
,
1127 .dport
= inet
->dport
,
1132 security_sk_classify_flow(sk
, &fl
);
1133 err
= ip_route_output_flow(sock_net(sk
), &rt
, &fl
, sk
, 0);
1136 sk_setup_caps(sk
, &rt
->u
.dst
);
1138 /* Routing failed... */
1139 sk
->sk_route_caps
= 0;
1141 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1142 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1144 if (!sysctl_ip_dynaddr
||
1145 sk
->sk_state
!= TCP_SYN_SENT
||
1146 (sk
->sk_userlocks
& SOCK_BINDADDR_LOCK
) ||
1147 (err
= inet_sk_reselect_saddr(sk
)) != 0)
1148 sk
->sk_err_soft
= -err
;
1154 EXPORT_SYMBOL(inet_sk_rebuild_header
);
1156 static int inet_gso_send_check(struct sk_buff
*skb
)
1159 struct net_protocol
*ops
;
1164 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1169 if (ihl
< sizeof(*iph
))
1172 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1175 __skb_pull(skb
, ihl
);
1176 skb_reset_transport_header(skb
);
1178 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1179 err
= -EPROTONOSUPPORT
;
1182 ops
= rcu_dereference(inet_protos
[proto
]);
1183 if (likely(ops
&& ops
->gso_send_check
))
1184 err
= ops
->gso_send_check(skb
);
1191 static struct sk_buff
*inet_gso_segment(struct sk_buff
*skb
, int features
)
1193 struct sk_buff
*segs
= ERR_PTR(-EINVAL
);
1195 struct net_protocol
*ops
;
1200 if (!(features
& NETIF_F_V4_CSUM
))
1201 features
&= ~NETIF_F_SG
;
1203 if (unlikely(skb_shinfo(skb
)->gso_type
&
1211 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1216 if (ihl
< sizeof(*iph
))
1219 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1222 __skb_pull(skb
, ihl
);
1223 skb_reset_transport_header(skb
);
1225 id
= ntohs(iph
->id
);
1226 proto
= iph
->protocol
& (MAX_INET_PROTOS
- 1);
1227 segs
= ERR_PTR(-EPROTONOSUPPORT
);
1230 ops
= rcu_dereference(inet_protos
[proto
]);
1231 if (likely(ops
&& ops
->gso_segment
))
1232 segs
= ops
->gso_segment(skb
, features
);
1235 if (!segs
|| IS_ERR(segs
))
1241 iph
->id
= htons(id
++);
1242 iph
->tot_len
= htons(skb
->len
- skb
->mac_len
);
1244 iph
->check
= ip_fast_csum(skb_network_header(skb
), iph
->ihl
);
1245 } while ((skb
= skb
->next
));
1251 int inet_ctl_sock_create(struct sock
**sk
, unsigned short family
,
1252 unsigned short type
, unsigned char protocol
,
1255 struct socket
*sock
;
1256 int rc
= sock_create_kern(family
, type
, protocol
, &sock
);
1260 (*sk
)->sk_allocation
= GFP_ATOMIC
;
1262 * Unhash it so that IP input processing does not even see it,
1263 * we do not wish this socket to see incoming packets.
1265 (*sk
)->sk_prot
->unhash(*sk
);
1267 sk_change_net(*sk
, net
);
1272 EXPORT_SYMBOL_GPL(inet_ctl_sock_create
);
1274 unsigned long snmp_fold_field(void *mib
[], int offt
)
1276 unsigned long res
= 0;
1279 for_each_possible_cpu(i
) {
1280 res
+= *(((unsigned long *) per_cpu_ptr(mib
[0], i
)) + offt
);
1281 res
+= *(((unsigned long *) per_cpu_ptr(mib
[1], i
)) + offt
);
1285 EXPORT_SYMBOL_GPL(snmp_fold_field
);
1287 int snmp_mib_init(void *ptr
[2], size_t mibsize
)
1289 BUG_ON(ptr
== NULL
);
1290 ptr
[0] = __alloc_percpu(mibsize
);
1293 ptr
[1] = __alloc_percpu(mibsize
);
1298 free_percpu(ptr
[0]);
1303 EXPORT_SYMBOL_GPL(snmp_mib_init
);
1305 void snmp_mib_free(void *ptr
[2])
1307 BUG_ON(ptr
== NULL
);
1308 free_percpu(ptr
[0]);
1309 free_percpu(ptr
[1]);
1310 ptr
[0] = ptr
[1] = NULL
;
1312 EXPORT_SYMBOL_GPL(snmp_mib_free
);
1314 #ifdef CONFIG_IP_MULTICAST
1315 static struct net_protocol igmp_protocol
= {
1316 .handler
= igmp_rcv
,
1320 static struct net_protocol tcp_protocol
= {
1321 .handler
= tcp_v4_rcv
,
1322 .err_handler
= tcp_v4_err
,
1323 .gso_send_check
= tcp_v4_gso_send_check
,
1324 .gso_segment
= tcp_tso_segment
,
1329 static struct net_protocol udp_protocol
= {
1331 .err_handler
= udp_err
,
1336 static struct net_protocol icmp_protocol
= {
1337 .handler
= icmp_rcv
,
1342 static int __init
init_ipv4_mibs(void)
1344 if (snmp_mib_init((void **)net_statistics
,
1345 sizeof(struct linux_mib
)) < 0)
1347 if (snmp_mib_init((void **)ip_statistics
,
1348 sizeof(struct ipstats_mib
)) < 0)
1350 if (snmp_mib_init((void **)icmp_statistics
,
1351 sizeof(struct icmp_mib
)) < 0)
1353 if (snmp_mib_init((void **)icmpmsg_statistics
,
1354 sizeof(struct icmpmsg_mib
)) < 0)
1355 goto err_icmpmsg_mib
;
1356 if (snmp_mib_init((void **)tcp_statistics
,
1357 sizeof(struct tcp_mib
)) < 0)
1359 if (snmp_mib_init((void **)udp_statistics
,
1360 sizeof(struct udp_mib
)) < 0)
1362 if (snmp_mib_init((void **)udplite_statistics
,
1363 sizeof(struct udp_mib
)) < 0)
1364 goto err_udplite_mib
;
1371 snmp_mib_free((void **)udp_statistics
);
1373 snmp_mib_free((void **)tcp_statistics
);
1375 snmp_mib_free((void **)icmpmsg_statistics
);
1377 snmp_mib_free((void **)icmp_statistics
);
1379 snmp_mib_free((void **)ip_statistics
);
1381 snmp_mib_free((void **)net_statistics
);
1386 static int ipv4_proc_init(void);
1389 * IP protocol layer initialiser
1392 static struct packet_type ip_packet_type
= {
1393 .type
= __constant_htons(ETH_P_IP
),
1395 .gso_send_check
= inet_gso_send_check
,
1396 .gso_segment
= inet_gso_segment
,
1399 static int __init
inet_init(void)
1401 struct sk_buff
*dummy_skb
;
1402 struct inet_protosw
*q
;
1403 struct list_head
*r
;
1406 BUILD_BUG_ON(sizeof(struct inet_skb_parm
) > sizeof(dummy_skb
->cb
));
1408 rc
= proto_register(&tcp_prot
, 1);
1412 rc
= proto_register(&udp_prot
, 1);
1414 goto out_unregister_tcp_proto
;
1416 rc
= proto_register(&raw_prot
, 1);
1418 goto out_unregister_udp_proto
;
1421 * Tell SOCKET that we are alive...
1424 (void)sock_register(&inet_family_ops
);
1427 * Add all the base protocols.
1430 if (inet_add_protocol(&icmp_protocol
, IPPROTO_ICMP
) < 0)
1431 printk(KERN_CRIT
"inet_init: Cannot add ICMP protocol\n");
1432 if (inet_add_protocol(&udp_protocol
, IPPROTO_UDP
) < 0)
1433 printk(KERN_CRIT
"inet_init: Cannot add UDP protocol\n");
1434 if (inet_add_protocol(&tcp_protocol
, IPPROTO_TCP
) < 0)
1435 printk(KERN_CRIT
"inet_init: Cannot add TCP protocol\n");
1436 #ifdef CONFIG_IP_MULTICAST
1437 if (inet_add_protocol(&igmp_protocol
, IPPROTO_IGMP
) < 0)
1438 printk(KERN_CRIT
"inet_init: Cannot add IGMP protocol\n");
1441 /* Register the socket-side information for inet_create. */
1442 for (r
= &inetsw
[0]; r
< &inetsw
[SOCK_MAX
]; ++r
)
1445 for (q
= inetsw_array
; q
< &inetsw_array
[INETSW_ARRAY_LEN
]; ++q
)
1446 inet_register_protosw(q
);
1449 * Set the ARP module up
1455 * Set the IP module up
1462 /* Setup TCP slab cache for open requests. */
1465 /* Setup UDP memory threshold */
1468 /* Add UDP-Lite (RFC 3828) */
1469 udplite4_register();
1472 * Set the ICMP layer up
1475 if (icmp_init() < 0)
1476 panic("Failed to create the ICMP control socket.\n");
1479 * Initialise the multicast router
1481 #if defined(CONFIG_IP_MROUTE)
1485 * Initialise per-cpu ipv4 mibs
1488 if (init_ipv4_mibs())
1489 printk(KERN_CRIT
"inet_init: Cannot init ipv4 mibs\n"); ;
1495 dev_add_pack(&ip_packet_type
);
1500 out_unregister_udp_proto
:
1501 proto_unregister(&udp_prot
);
1502 out_unregister_tcp_proto
:
1503 proto_unregister(&tcp_prot
);
1507 fs_initcall(inet_init
);
1509 /* ------------------------------------------------------------------------ */
1511 #ifdef CONFIG_PROC_FS
1512 static int __init
ipv4_proc_init(void)
1516 if (raw_proc_init())
1518 if (tcp4_proc_init())
1520 if (udp4_proc_init())
1522 if (ip_misc_proc_init())
1537 #else /* CONFIG_PROC_FS */
1538 static int __init
ipv4_proc_init(void)
1542 #endif /* CONFIG_PROC_FS */
1544 MODULE_ALIAS_NETPROTO(PF_INET
);
1546 EXPORT_SYMBOL(inet_accept
);
1547 EXPORT_SYMBOL(inet_bind
);
1548 EXPORT_SYMBOL(inet_dgram_connect
);
1549 EXPORT_SYMBOL(inet_dgram_ops
);
1550 EXPORT_SYMBOL(inet_getname
);
1551 EXPORT_SYMBOL(inet_ioctl
);
1552 EXPORT_SYMBOL(inet_listen
);
1553 EXPORT_SYMBOL(inet_register_protosw
);
1554 EXPORT_SYMBOL(inet_release
);
1555 EXPORT_SYMBOL(inet_sendmsg
);
1556 EXPORT_SYMBOL(inet_shutdown
);
1557 EXPORT_SYMBOL(inet_sock_destruct
);
1558 EXPORT_SYMBOL(inet_stream_connect
);
1559 EXPORT_SYMBOL(inet_stream_ops
);
1560 EXPORT_SYMBOL(inet_unregister_protosw
);
1561 EXPORT_SYMBOL(net_statistics
);
1562 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind
);