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 #define pr_fmt(fmt) "IPv4: " fmt
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/kmod.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>
91 #include <linux/slab.h>
93 #include <linux/uaccess.h>
95 #include <linux/inet.h>
96 #include <linux/igmp.h>
97 #include <linux/inetdevice.h>
98 #include <linux/netdevice.h>
99 #include <net/checksum.h>
101 #include <net/protocol.h>
103 #include <net/route.h>
104 #include <net/ip_fib.h>
105 #include <net/inet_connection_sock.h>
108 #include <net/udplite.h>
109 #include <net/ping.h>
110 #include <linux/skbuff.h>
111 #include <net/sock.h>
113 #include <net/icmp.h>
114 #include <net/inet_common.h>
115 #include <net/ip_tunnels.h>
116 #include <net/xfrm.h>
117 #include <net/net_namespace.h>
118 #include <net/secure_seq.h>
119 #ifdef CONFIG_IP_MROUTE
120 #include <linux/mroute.h>
122 #include <net/l3mdev.h>
125 /* The inetsw table contains everything that inet_create needs to
126 * build a new socket.
128 static struct list_head inetsw
[SOCK_MAX
];
129 static DEFINE_SPINLOCK(inetsw_lock
);
131 /* New destruction routine */
133 void inet_sock_destruct(struct sock
*sk
)
135 struct inet_sock
*inet
= inet_sk(sk
);
137 __skb_queue_purge(&sk
->sk_receive_queue
);
138 __skb_queue_purge(&sk
->sk_error_queue
);
142 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
!= TCP_CLOSE
) {
143 pr_err("Attempt to release TCP socket in state %d %p\n",
147 if (!sock_flag(sk
, SOCK_DEAD
)) {
148 pr_err("Attempt to release alive inet socket %p\n", sk
);
152 WARN_ON(atomic_read(&sk
->sk_rmem_alloc
));
153 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
154 WARN_ON(sk
->sk_wmem_queued
);
155 WARN_ON(sk
->sk_forward_alloc
);
157 kfree(rcu_dereference_protected(inet
->inet_opt
, 1));
158 dst_release(rcu_dereference_check(sk
->sk_dst_cache
, 1));
159 dst_release(sk
->sk_rx_dst
);
160 sk_refcnt_debug_dec(sk
);
162 EXPORT_SYMBOL(inet_sock_destruct
);
165 * The routines beyond this point handle the behaviour of an AF_INET
166 * socket object. Mostly it punts to the subprotocols of IP to do
171 * Automatically bind an unbound socket.
174 static int inet_autobind(struct sock
*sk
)
176 struct inet_sock
*inet
;
177 /* We may need to bind the socket. */
180 if (!inet
->inet_num
) {
181 if (sk
->sk_prot
->get_port(sk
, 0)) {
185 inet
->inet_sport
= htons(inet
->inet_num
);
192 * Move a socket into listening state.
194 int inet_listen(struct socket
*sock
, int backlog
)
196 struct sock
*sk
= sock
->sk
;
197 unsigned char old_state
;
203 if (sock
->state
!= SS_UNCONNECTED
|| sock
->type
!= SOCK_STREAM
)
206 old_state
= sk
->sk_state
;
207 if (!((1 << old_state
) & (TCPF_CLOSE
| TCPF_LISTEN
)))
210 /* Really, if the socket is already in listen state
211 * we can only allow the backlog to be adjusted.
213 if (old_state
!= TCP_LISTEN
) {
214 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
215 * Note that only TCP sockets (SOCK_STREAM) will reach here.
216 * Also fastopen backlog may already been set via the option
217 * because the socket was in TCP_LISTEN state previously but
218 * was shutdown() rather than close().
220 if ((sysctl_tcp_fastopen
& TFO_SERVER_WO_SOCKOPT1
) &&
221 (sysctl_tcp_fastopen
& TFO_SERVER_ENABLE
) &&
222 !inet_csk(sk
)->icsk_accept_queue
.fastopenq
.max_qlen
) {
223 fastopen_queue_tune(sk
, backlog
);
224 tcp_fastopen_init_key_once(true);
227 err
= inet_csk_listen_start(sk
, backlog
);
231 sk
->sk_max_ack_backlog
= backlog
;
238 EXPORT_SYMBOL(inet_listen
);
241 * Create an inet socket.
244 static int inet_create(struct net
*net
, struct socket
*sock
, int protocol
,
248 struct inet_protosw
*answer
;
249 struct inet_sock
*inet
;
250 struct proto
*answer_prot
;
251 unsigned char answer_flags
;
252 int try_loading_module
= 0;
255 if (protocol
< 0 || protocol
>= IPPROTO_MAX
)
258 sock
->state
= SS_UNCONNECTED
;
260 /* Look for the requested type/protocol pair. */
262 err
= -ESOCKTNOSUPPORT
;
264 list_for_each_entry_rcu(answer
, &inetsw
[sock
->type
], list
) {
267 /* Check the non-wild match. */
268 if (protocol
== answer
->protocol
) {
269 if (protocol
!= IPPROTO_IP
)
272 /* Check for the two wild cases. */
273 if (IPPROTO_IP
== protocol
) {
274 protocol
= answer
->protocol
;
277 if (IPPROTO_IP
== answer
->protocol
)
280 err
= -EPROTONOSUPPORT
;
284 if (try_loading_module
< 2) {
287 * Be more specific, e.g. net-pf-2-proto-132-type-1
288 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
290 if (++try_loading_module
== 1)
291 request_module("net-pf-%d-proto-%d-type-%d",
292 PF_INET
, protocol
, sock
->type
);
294 * Fall back to generic, e.g. net-pf-2-proto-132
295 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
298 request_module("net-pf-%d-proto-%d",
300 goto lookup_protocol
;
306 if (sock
->type
== SOCK_RAW
&& !kern
&&
307 !ns_capable(net
->user_ns
, CAP_NET_RAW
))
310 sock
->ops
= answer
->ops
;
311 answer_prot
= answer
->prot
;
312 answer_flags
= answer
->flags
;
315 WARN_ON(!answer_prot
->slab
);
318 sk
= sk_alloc(net
, PF_INET
, GFP_KERNEL
, answer_prot
, kern
);
323 if (INET_PROTOSW_REUSE
& answer_flags
)
324 sk
->sk_reuse
= SK_CAN_REUSE
;
327 inet
->is_icsk
= (INET_PROTOSW_ICSK
& answer_flags
) != 0;
331 if (SOCK_RAW
== sock
->type
) {
332 inet
->inet_num
= protocol
;
333 if (IPPROTO_RAW
== protocol
)
337 if (net
->ipv4
.sysctl_ip_no_pmtu_disc
)
338 inet
->pmtudisc
= IP_PMTUDISC_DONT
;
340 inet
->pmtudisc
= IP_PMTUDISC_WANT
;
344 sock_init_data(sock
, sk
);
346 sk
->sk_destruct
= inet_sock_destruct
;
347 sk
->sk_protocol
= protocol
;
348 sk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
355 inet
->mc_list
= NULL
;
358 sk_refcnt_debug_inc(sk
);
360 if (inet
->inet_num
) {
361 /* It assumes that any protocol which allows
362 * the user to assign a number at socket
363 * creation time automatically
366 inet
->inet_sport
= htons(inet
->inet_num
);
367 /* Add to protocol hash chains. */
368 err
= sk
->sk_prot
->hash(sk
);
370 sk_common_release(sk
);
375 if (sk
->sk_prot
->init
) {
376 err
= sk
->sk_prot
->init(sk
);
378 sk_common_release(sk
);
384 err
= BPF_CGROUP_RUN_PROG_INET_SOCK(sk
);
386 sk_common_release(sk
);
399 * The peer socket should always be NULL (or else). When we call this
400 * function we are destroying the object and from then on nobody
401 * should refer to it.
403 int inet_release(struct socket
*sock
)
405 struct sock
*sk
= sock
->sk
;
410 /* Applications forget to leave groups before exiting */
411 ip_mc_drop_socket(sk
);
413 /* If linger is set, we don't return until the close
414 * is complete. Otherwise we return immediately. The
415 * actually closing is done the same either way.
417 * If the close is due to the process exiting, we never
421 if (sock_flag(sk
, SOCK_LINGER
) &&
422 !(current
->flags
& PF_EXITING
))
423 timeout
= sk
->sk_lingertime
;
425 sk
->sk_prot
->close(sk
, timeout
);
429 EXPORT_SYMBOL(inet_release
);
431 int inet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
433 struct sockaddr_in
*addr
= (struct sockaddr_in
*)uaddr
;
434 struct sock
*sk
= sock
->sk
;
435 struct inet_sock
*inet
= inet_sk(sk
);
436 struct net
*net
= sock_net(sk
);
439 u32 tb_id
= RT_TABLE_LOCAL
;
442 /* If the socket has its own bind function then use it. (RAW) */
443 if (sk
->sk_prot
->bind
) {
444 err
= sk
->sk_prot
->bind(sk
, uaddr
, addr_len
);
448 if (addr_len
< sizeof(struct sockaddr_in
))
451 if (addr
->sin_family
!= AF_INET
) {
452 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
453 * only if s_addr is INADDR_ANY.
456 if (addr
->sin_family
!= AF_UNSPEC
||
457 addr
->sin_addr
.s_addr
!= htonl(INADDR_ANY
))
461 tb_id
= l3mdev_fib_table_by_index(net
, sk
->sk_bound_dev_if
) ? : tb_id
;
462 chk_addr_ret
= inet_addr_type_table(net
, addr
->sin_addr
.s_addr
, tb_id
);
464 /* Not specified by any standard per-se, however it breaks too
465 * many applications when removed. It is unfortunate since
466 * allowing applications to make a non-local bind solves
467 * several problems with systems using dynamic addressing.
468 * (ie. your servers still start up even if your ISDN link
469 * is temporarily down)
471 err
= -EADDRNOTAVAIL
;
472 if (!net
->ipv4
.sysctl_ip_nonlocal_bind
&&
473 !(inet
->freebind
|| inet
->transparent
) &&
474 addr
->sin_addr
.s_addr
!= htonl(INADDR_ANY
) &&
475 chk_addr_ret
!= RTN_LOCAL
&&
476 chk_addr_ret
!= RTN_MULTICAST
&&
477 chk_addr_ret
!= RTN_BROADCAST
)
480 snum
= ntohs(addr
->sin_port
);
482 if (snum
&& snum
< inet_prot_sock(net
) &&
483 !ns_capable(net
->user_ns
, CAP_NET_BIND_SERVICE
))
486 /* We keep a pair of addresses. rcv_saddr is the one
487 * used by hash lookups, and saddr is used for transmit.
489 * In the BSD API these are the same except where it
490 * would be illegal to use them (multicast/broadcast) in
491 * which case the sending device address is used.
495 /* Check these errors (active socket, double bind). */
497 if (sk
->sk_state
!= TCP_CLOSE
|| inet
->inet_num
)
498 goto out_release_sock
;
500 inet
->inet_rcv_saddr
= inet
->inet_saddr
= addr
->sin_addr
.s_addr
;
501 if (chk_addr_ret
== RTN_MULTICAST
|| chk_addr_ret
== RTN_BROADCAST
)
502 inet
->inet_saddr
= 0; /* Use device */
504 /* Make sure we are allowed to bind here. */
505 if ((snum
|| !inet
->bind_address_no_port
) &&
506 sk
->sk_prot
->get_port(sk
, snum
)) {
507 inet
->inet_saddr
= inet
->inet_rcv_saddr
= 0;
509 goto out_release_sock
;
512 if (inet
->inet_rcv_saddr
)
513 sk
->sk_userlocks
|= SOCK_BINDADDR_LOCK
;
515 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
516 inet
->inet_sport
= htons(inet
->inet_num
);
517 inet
->inet_daddr
= 0;
518 inet
->inet_dport
= 0;
526 EXPORT_SYMBOL(inet_bind
);
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 (addr_len
< sizeof(uaddr
->sa_family
))
535 if (uaddr
->sa_family
== AF_UNSPEC
)
536 return sk
->sk_prot
->disconnect(sk
, flags
);
538 if (!inet_sk(sk
)->inet_num
&& inet_autobind(sk
))
540 return sk
->sk_prot
->connect(sk
, uaddr
, addr_len
);
542 EXPORT_SYMBOL(inet_dgram_connect
);
544 static long inet_wait_for_connect(struct sock
*sk
, long timeo
, int writebias
)
546 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
548 add_wait_queue(sk_sleep(sk
), &wait
);
549 sk
->sk_write_pending
+= writebias
;
551 /* Basic assumption: if someone sets sk->sk_err, he _must_
552 * change state of the socket from TCP_SYN_*.
553 * Connect() does not allow to get error notifications
554 * without closing the socket.
556 while ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
558 timeo
= wait_woken(&wait
, TASK_INTERRUPTIBLE
, timeo
);
560 if (signal_pending(current
) || !timeo
)
563 remove_wait_queue(sk_sleep(sk
), &wait
);
564 sk
->sk_write_pending
-= writebias
;
569 * Connect to a remote host. There is regrettably still a little
570 * TCP 'magic' in here.
572 int __inet_stream_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
573 int addr_len
, int flags
, int is_sendmsg
)
575 struct sock
*sk
= sock
->sk
;
580 * uaddr can be NULL and addr_len can be 0 if:
581 * sk is a TCP fastopen active socket and
582 * TCP_FASTOPEN_CONNECT sockopt is set and
583 * we already have a valid cookie for this socket.
584 * In this case, user can call write() after connect().
585 * write() will invoke tcp_sendmsg_fastopen() which calls
586 * __inet_stream_connect().
589 if (addr_len
< sizeof(uaddr
->sa_family
))
592 if (uaddr
->sa_family
== AF_UNSPEC
) {
593 err
= sk
->sk_prot
->disconnect(sk
, flags
);
594 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
599 switch (sock
->state
) {
607 if (inet_sk(sk
)->defer_connect
)
608 err
= is_sendmsg
? -EINPROGRESS
: -EISCONN
;
611 /* Fall out of switch with err, set for this state */
615 if (sk
->sk_state
!= TCP_CLOSE
)
618 err
= sk
->sk_prot
->connect(sk
, uaddr
, addr_len
);
622 sock
->state
= SS_CONNECTING
;
624 if (!err
&& inet_sk(sk
)->defer_connect
)
627 /* Just entered SS_CONNECTING state; the only
628 * difference is that return value in non-blocking
629 * case is EINPROGRESS, rather than EALREADY.
635 timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
637 if ((1 << sk
->sk_state
) & (TCPF_SYN_SENT
| TCPF_SYN_RECV
)) {
638 int writebias
= (sk
->sk_protocol
== IPPROTO_TCP
) &&
639 tcp_sk(sk
)->fastopen_req
&&
640 tcp_sk(sk
)->fastopen_req
->data
? 1 : 0;
642 /* Error code is set above */
643 if (!timeo
|| !inet_wait_for_connect(sk
, timeo
, writebias
))
646 err
= sock_intr_errno(timeo
);
647 if (signal_pending(current
))
651 /* Connection was closed by RST, timeout, ICMP error
652 * or another process disconnected us.
654 if (sk
->sk_state
== TCP_CLOSE
)
657 /* sk->sk_err may be not zero now, if RECVERR was ordered by user
658 * and error was received after socket entered established state.
659 * Hence, it is handled normally after connect() return successfully.
662 sock
->state
= SS_CONNECTED
;
668 err
= sock_error(sk
) ? : -ECONNABORTED
;
669 sock
->state
= SS_UNCONNECTED
;
670 if (sk
->sk_prot
->disconnect(sk
, flags
))
671 sock
->state
= SS_DISCONNECTING
;
674 EXPORT_SYMBOL(__inet_stream_connect
);
676 int inet_stream_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
677 int addr_len
, int flags
)
682 err
= __inet_stream_connect(sock
, uaddr
, addr_len
, flags
, 0);
683 release_sock(sock
->sk
);
686 EXPORT_SYMBOL(inet_stream_connect
);
689 * Accept a pending connection. The TCP layer now gives BSD semantics.
692 int inet_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
694 struct sock
*sk1
= sock
->sk
;
696 struct sock
*sk2
= sk1
->sk_prot
->accept(sk1
, flags
, &err
);
703 sock_rps_record_flow(sk2
);
704 WARN_ON(!((1 << sk2
->sk_state
) &
705 (TCPF_ESTABLISHED
| TCPF_SYN_RECV
|
706 TCPF_CLOSE_WAIT
| TCPF_CLOSE
)));
708 sock_graft(sk2
, newsock
);
710 newsock
->state
= SS_CONNECTED
;
716 EXPORT_SYMBOL(inet_accept
);
720 * This does both peername and sockname.
722 int inet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
723 int *uaddr_len
, int peer
)
725 struct sock
*sk
= sock
->sk
;
726 struct inet_sock
*inet
= inet_sk(sk
);
727 DECLARE_SOCKADDR(struct sockaddr_in
*, sin
, uaddr
);
729 sin
->sin_family
= AF_INET
;
731 if (!inet
->inet_dport
||
732 (((1 << sk
->sk_state
) & (TCPF_CLOSE
| TCPF_SYN_SENT
)) &&
735 sin
->sin_port
= inet
->inet_dport
;
736 sin
->sin_addr
.s_addr
= inet
->inet_daddr
;
738 __be32 addr
= inet
->inet_rcv_saddr
;
740 addr
= inet
->inet_saddr
;
741 sin
->sin_port
= inet
->inet_sport
;
742 sin
->sin_addr
.s_addr
= addr
;
744 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
745 *uaddr_len
= sizeof(*sin
);
748 EXPORT_SYMBOL(inet_getname
);
750 int inet_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
)
752 struct sock
*sk
= sock
->sk
;
754 sock_rps_record_flow(sk
);
756 /* We may need to bind the socket. */
757 if (!inet_sk(sk
)->inet_num
&& !sk
->sk_prot
->no_autobind
&&
761 return sk
->sk_prot
->sendmsg(sk
, msg
, size
);
763 EXPORT_SYMBOL(inet_sendmsg
);
765 ssize_t
inet_sendpage(struct socket
*sock
, struct page
*page
, int offset
,
766 size_t size
, int flags
)
768 struct sock
*sk
= sock
->sk
;
770 sock_rps_record_flow(sk
);
772 /* We may need to bind the socket. */
773 if (!inet_sk(sk
)->inet_num
&& !sk
->sk_prot
->no_autobind
&&
777 if (sk
->sk_prot
->sendpage
)
778 return sk
->sk_prot
->sendpage(sk
, page
, offset
, size
, flags
);
779 return sock_no_sendpage(sock
, page
, offset
, size
, flags
);
781 EXPORT_SYMBOL(inet_sendpage
);
783 int inet_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
,
786 struct sock
*sk
= sock
->sk
;
790 sock_rps_record_flow(sk
);
792 err
= sk
->sk_prot
->recvmsg(sk
, msg
, size
, flags
& MSG_DONTWAIT
,
793 flags
& ~MSG_DONTWAIT
, &addr_len
);
795 msg
->msg_namelen
= addr_len
;
798 EXPORT_SYMBOL(inet_recvmsg
);
800 int inet_shutdown(struct socket
*sock
, int how
)
802 struct sock
*sk
= sock
->sk
;
805 /* This should really check to make sure
806 * the socket is a TCP socket. (WHY AC...)
808 how
++; /* maps 0->1 has the advantage of making bit 1 rcvs and
811 if ((how
& ~SHUTDOWN_MASK
) || !how
) /* MAXINT->0 */
815 if (sock
->state
== SS_CONNECTING
) {
816 if ((1 << sk
->sk_state
) &
817 (TCPF_SYN_SENT
| TCPF_SYN_RECV
| TCPF_CLOSE
))
818 sock
->state
= SS_DISCONNECTING
;
820 sock
->state
= SS_CONNECTED
;
823 switch (sk
->sk_state
) {
826 /* Hack to wake up other listeners, who can poll for
827 POLLHUP, even on eg. unconnected UDP sockets -- RR */
829 sk
->sk_shutdown
|= how
;
830 if (sk
->sk_prot
->shutdown
)
831 sk
->sk_prot
->shutdown(sk
, how
);
834 /* Remaining two branches are temporary solution for missing
835 * close() in multithreaded environment. It is _not_ a good idea,
836 * but we have no choice until close() is repaired at VFS level.
839 if (!(how
& RCV_SHUTDOWN
))
843 err
= sk
->sk_prot
->disconnect(sk
, O_NONBLOCK
);
844 sock
->state
= err
? SS_DISCONNECTING
: SS_UNCONNECTED
;
848 /* Wake up anyone sleeping in poll. */
849 sk
->sk_state_change(sk
);
853 EXPORT_SYMBOL(inet_shutdown
);
856 * ioctl() calls you can issue on an INET socket. Most of these are
857 * device configuration and stuff and very rarely used. Some ioctls
858 * pass on to the socket itself.
860 * NOTE: I like the idea of a module for the config stuff. ie ifconfig
861 * loads the devconfigure module does its configuring and unloads it.
862 * There's a good 20K of config code hanging around the kernel.
865 int inet_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
867 struct sock
*sk
= sock
->sk
;
869 struct net
*net
= sock_net(sk
);
873 err
= sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
876 err
= sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
881 err
= ip_rt_ioctl(net
, cmd
, (void __user
*)arg
);
886 err
= arp_ioctl(net
, cmd
, (void __user
*)arg
);
899 err
= devinet_ioctl(net
, cmd
, (void __user
*)arg
);
902 if (sk
->sk_prot
->ioctl
)
903 err
= sk
->sk_prot
->ioctl(sk
, cmd
, arg
);
910 EXPORT_SYMBOL(inet_ioctl
);
913 static int inet_compat_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
915 struct sock
*sk
= sock
->sk
;
916 int err
= -ENOIOCTLCMD
;
918 if (sk
->sk_prot
->compat_ioctl
)
919 err
= sk
->sk_prot
->compat_ioctl(sk
, cmd
, arg
);
925 const struct proto_ops inet_stream_ops
= {
927 .owner
= THIS_MODULE
,
928 .release
= inet_release
,
930 .connect
= inet_stream_connect
,
931 .socketpair
= sock_no_socketpair
,
932 .accept
= inet_accept
,
933 .getname
= inet_getname
,
936 .listen
= inet_listen
,
937 .shutdown
= inet_shutdown
,
938 .setsockopt
= sock_common_setsockopt
,
939 .getsockopt
= sock_common_getsockopt
,
940 .sendmsg
= inet_sendmsg
,
941 .recvmsg
= inet_recvmsg
,
942 .mmap
= sock_no_mmap
,
943 .sendpage
= inet_sendpage
,
944 .splice_read
= tcp_splice_read
,
945 .read_sock
= tcp_read_sock
,
946 .peek_len
= tcp_peek_len
,
948 .compat_setsockopt
= compat_sock_common_setsockopt
,
949 .compat_getsockopt
= compat_sock_common_getsockopt
,
950 .compat_ioctl
= inet_compat_ioctl
,
953 EXPORT_SYMBOL(inet_stream_ops
);
955 const struct proto_ops inet_dgram_ops
= {
957 .owner
= THIS_MODULE
,
958 .release
= inet_release
,
960 .connect
= inet_dgram_connect
,
961 .socketpair
= sock_no_socketpair
,
962 .accept
= sock_no_accept
,
963 .getname
= inet_getname
,
966 .listen
= sock_no_listen
,
967 .shutdown
= inet_shutdown
,
968 .setsockopt
= sock_common_setsockopt
,
969 .getsockopt
= sock_common_getsockopt
,
970 .sendmsg
= inet_sendmsg
,
971 .recvmsg
= inet_recvmsg
,
972 .mmap
= sock_no_mmap
,
973 .sendpage
= inet_sendpage
,
974 .set_peek_off
= sk_set_peek_off
,
976 .compat_setsockopt
= compat_sock_common_setsockopt
,
977 .compat_getsockopt
= compat_sock_common_getsockopt
,
978 .compat_ioctl
= inet_compat_ioctl
,
981 EXPORT_SYMBOL(inet_dgram_ops
);
984 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
987 static const struct proto_ops inet_sockraw_ops
= {
989 .owner
= THIS_MODULE
,
990 .release
= inet_release
,
992 .connect
= inet_dgram_connect
,
993 .socketpair
= sock_no_socketpair
,
994 .accept
= sock_no_accept
,
995 .getname
= inet_getname
,
996 .poll
= datagram_poll
,
998 .listen
= sock_no_listen
,
999 .shutdown
= inet_shutdown
,
1000 .setsockopt
= sock_common_setsockopt
,
1001 .getsockopt
= sock_common_getsockopt
,
1002 .sendmsg
= inet_sendmsg
,
1003 .recvmsg
= inet_recvmsg
,
1004 .mmap
= sock_no_mmap
,
1005 .sendpage
= inet_sendpage
,
1006 #ifdef CONFIG_COMPAT
1007 .compat_setsockopt
= compat_sock_common_setsockopt
,
1008 .compat_getsockopt
= compat_sock_common_getsockopt
,
1009 .compat_ioctl
= inet_compat_ioctl
,
1013 static const struct net_proto_family inet_family_ops
= {
1015 .create
= inet_create
,
1016 .owner
= THIS_MODULE
,
1019 /* Upon startup we insert all the elements in inetsw_array[] into
1020 * the linked list inetsw.
1022 static struct inet_protosw inetsw_array
[] =
1025 .type
= SOCK_STREAM
,
1026 .protocol
= IPPROTO_TCP
,
1028 .ops
= &inet_stream_ops
,
1029 .flags
= INET_PROTOSW_PERMANENT
|
1035 .protocol
= IPPROTO_UDP
,
1037 .ops
= &inet_dgram_ops
,
1038 .flags
= INET_PROTOSW_PERMANENT
,
1043 .protocol
= IPPROTO_ICMP
,
1045 .ops
= &inet_dgram_ops
,
1046 .flags
= INET_PROTOSW_REUSE
,
1051 .protocol
= IPPROTO_IP
, /* wild card */
1053 .ops
= &inet_sockraw_ops
,
1054 .flags
= INET_PROTOSW_REUSE
,
1058 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1060 void inet_register_protosw(struct inet_protosw
*p
)
1062 struct list_head
*lh
;
1063 struct inet_protosw
*answer
;
1064 int protocol
= p
->protocol
;
1065 struct list_head
*last_perm
;
1067 spin_lock_bh(&inetsw_lock
);
1069 if (p
->type
>= SOCK_MAX
)
1072 /* If we are trying to override a permanent protocol, bail. */
1073 last_perm
= &inetsw
[p
->type
];
1074 list_for_each(lh
, &inetsw
[p
->type
]) {
1075 answer
= list_entry(lh
, struct inet_protosw
, list
);
1076 /* Check only the non-wild match. */
1077 if ((INET_PROTOSW_PERMANENT
& answer
->flags
) == 0)
1079 if (protocol
== answer
->protocol
)
1084 /* Add the new entry after the last permanent entry if any, so that
1085 * the new entry does not override a permanent entry when matched with
1086 * a wild-card protocol. But it is allowed to override any existing
1087 * non-permanent entry. This means that when we remove this entry, the
1088 * system automatically returns to the old behavior.
1090 list_add_rcu(&p
->list
, last_perm
);
1092 spin_unlock_bh(&inetsw_lock
);
1097 pr_err("Attempt to override permanent protocol %d\n", protocol
);
1101 pr_err("Ignoring attempt to register invalid socket type %d\n",
1105 EXPORT_SYMBOL(inet_register_protosw
);
1107 void inet_unregister_protosw(struct inet_protosw
*p
)
1109 if (INET_PROTOSW_PERMANENT
& p
->flags
) {
1110 pr_err("Attempt to unregister permanent protocol %d\n",
1113 spin_lock_bh(&inetsw_lock
);
1114 list_del_rcu(&p
->list
);
1115 spin_unlock_bh(&inetsw_lock
);
1120 EXPORT_SYMBOL(inet_unregister_protosw
);
1122 static int inet_sk_reselect_saddr(struct sock
*sk
)
1124 struct inet_sock
*inet
= inet_sk(sk
);
1125 __be32 old_saddr
= inet
->inet_saddr
;
1126 __be32 daddr
= inet
->inet_daddr
;
1130 struct ip_options_rcu
*inet_opt
;
1132 inet_opt
= rcu_dereference_protected(inet
->inet_opt
,
1133 lockdep_sock_is_held(sk
));
1134 if (inet_opt
&& inet_opt
->opt
.srr
)
1135 daddr
= inet_opt
->opt
.faddr
;
1137 /* Query new route. */
1138 fl4
= &inet
->cork
.fl
.u
.ip4
;
1139 rt
= ip_route_connect(fl4
, daddr
, 0, RT_CONN_FLAGS(sk
),
1140 sk
->sk_bound_dev_if
, sk
->sk_protocol
,
1141 inet
->inet_sport
, inet
->inet_dport
, sk
);
1145 sk_setup_caps(sk
, &rt
->dst
);
1147 new_saddr
= fl4
->saddr
;
1149 if (new_saddr
== old_saddr
)
1152 if (sock_net(sk
)->ipv4
.sysctl_ip_dynaddr
> 1) {
1153 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1154 __func__
, &old_saddr
, &new_saddr
);
1157 inet
->inet_saddr
= inet
->inet_rcv_saddr
= new_saddr
;
1160 * XXX The only one ugly spot where we need to
1161 * XXX really change the sockets identity after
1162 * XXX it has entered the hashes. -DaveM
1164 * Besides that, it does not check for connection
1165 * uniqueness. Wait for troubles.
1167 return __sk_prot_rehash(sk
);
1170 int inet_sk_rebuild_header(struct sock
*sk
)
1172 struct inet_sock
*inet
= inet_sk(sk
);
1173 struct rtable
*rt
= (struct rtable
*)__sk_dst_check(sk
, 0);
1175 struct ip_options_rcu
*inet_opt
;
1179 /* Route is OK, nothing to do. */
1185 inet_opt
= rcu_dereference(inet
->inet_opt
);
1186 daddr
= inet
->inet_daddr
;
1187 if (inet_opt
&& inet_opt
->opt
.srr
)
1188 daddr
= inet_opt
->opt
.faddr
;
1190 fl4
= &inet
->cork
.fl
.u
.ip4
;
1191 rt
= ip_route_output_ports(sock_net(sk
), fl4
, sk
, daddr
, inet
->inet_saddr
,
1192 inet
->inet_dport
, inet
->inet_sport
,
1193 sk
->sk_protocol
, RT_CONN_FLAGS(sk
),
1194 sk
->sk_bound_dev_if
);
1197 sk_setup_caps(sk
, &rt
->dst
);
1201 /* Routing failed... */
1202 sk
->sk_route_caps
= 0;
1204 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1205 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1207 if (!sock_net(sk
)->ipv4
.sysctl_ip_dynaddr
||
1208 sk
->sk_state
!= TCP_SYN_SENT
||
1209 (sk
->sk_userlocks
& SOCK_BINDADDR_LOCK
) ||
1210 (err
= inet_sk_reselect_saddr(sk
)) != 0)
1211 sk
->sk_err_soft
= -err
;
1216 EXPORT_SYMBOL(inet_sk_rebuild_header
);
1218 struct sk_buff
*inet_gso_segment(struct sk_buff
*skb
,
1219 netdev_features_t features
)
1221 bool udpfrag
= false, fixedid
= false, gso_partial
, encap
;
1222 struct sk_buff
*segs
= ERR_PTR(-EINVAL
);
1223 const struct net_offload
*ops
;
1224 unsigned int offset
= 0;
1231 skb_reset_network_header(skb
);
1232 nhoff
= skb_network_header(skb
) - skb_mac_header(skb
);
1233 if (unlikely(!pskb_may_pull(skb
, sizeof(*iph
))))
1238 if (ihl
< sizeof(*iph
))
1241 id
= ntohs(iph
->id
);
1242 proto
= iph
->protocol
;
1244 /* Warning: after this point, iph might be no longer valid */
1245 if (unlikely(!pskb_may_pull(skb
, ihl
)))
1247 __skb_pull(skb
, ihl
);
1249 encap
= SKB_GSO_CB(skb
)->encap_level
> 0;
1251 features
&= skb
->dev
->hw_enc_features
;
1252 SKB_GSO_CB(skb
)->encap_level
+= ihl
;
1254 skb_reset_transport_header(skb
);
1256 segs
= ERR_PTR(-EPROTONOSUPPORT
);
1258 if (!skb
->encapsulation
|| encap
) {
1259 udpfrag
= !!(skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
);
1260 fixedid
= !!(skb_shinfo(skb
)->gso_type
& SKB_GSO_TCP_FIXEDID
);
1262 /* fixed ID is invalid if DF bit is not set */
1263 if (fixedid
&& !(ip_hdr(skb
)->frag_off
& htons(IP_DF
)))
1267 ops
= rcu_dereference(inet_offloads
[proto
]);
1268 if (likely(ops
&& ops
->callbacks
.gso_segment
))
1269 segs
= ops
->callbacks
.gso_segment(skb
, features
);
1271 if (IS_ERR_OR_NULL(segs
))
1274 gso_partial
= !!(skb_shinfo(segs
)->gso_type
& SKB_GSO_PARTIAL
);
1278 iph
= (struct iphdr
*)(skb_mac_header(skb
) + nhoff
);
1280 iph
->frag_off
= htons(offset
>> 3);
1282 iph
->frag_off
|= htons(IP_MF
);
1283 offset
+= skb
->len
- nhoff
- ihl
;
1284 tot_len
= skb
->len
- nhoff
;
1285 } else if (skb_is_gso(skb
)) {
1287 iph
->id
= htons(id
);
1288 id
+= skb_shinfo(skb
)->gso_segs
;
1292 tot_len
= skb_shinfo(skb
)->gso_size
+
1293 SKB_GSO_CB(skb
)->data_offset
+
1294 skb
->head
- (unsigned char *)iph
;
1296 tot_len
= skb
->len
- nhoff
;
1299 iph
->id
= htons(id
++);
1300 tot_len
= skb
->len
- nhoff
;
1302 iph
->tot_len
= htons(tot_len
);
1305 skb_reset_inner_headers(skb
);
1306 skb
->network_header
= (u8
*)iph
- skb
->head
;
1307 } while ((skb
= skb
->next
));
1312 EXPORT_SYMBOL(inet_gso_segment
);
1314 struct sk_buff
**inet_gro_receive(struct sk_buff
**head
, struct sk_buff
*skb
)
1316 const struct net_offload
*ops
;
1317 struct sk_buff
**pp
= NULL
;
1319 const struct iphdr
*iph
;
1326 off
= skb_gro_offset(skb
);
1327 hlen
= off
+ sizeof(*iph
);
1328 iph
= skb_gro_header_fast(skb
, off
);
1329 if (skb_gro_header_hard(skb
, hlen
)) {
1330 iph
= skb_gro_header_slow(skb
, hlen
, off
);
1335 proto
= iph
->protocol
;
1338 ops
= rcu_dereference(inet_offloads
[proto
]);
1339 if (!ops
|| !ops
->callbacks
.gro_receive
)
1342 if (*(u8
*)iph
!= 0x45)
1345 if (unlikely(ip_fast_csum((u8
*)iph
, 5)))
1348 id
= ntohl(*(__be32
*)&iph
->id
);
1349 flush
= (u16
)((ntohl(*(__be32
*)iph
) ^ skb_gro_len(skb
)) | (id
& ~IP_DF
));
1352 for (p
= *head
; p
; p
= p
->next
) {
1356 if (!NAPI_GRO_CB(p
)->same_flow
)
1359 iph2
= (struct iphdr
*)(p
->data
+ off
);
1360 /* The above works because, with the exception of the top
1361 * (inner most) layer, we only aggregate pkts with the same
1362 * hdr length so all the hdrs we'll need to verify will start
1363 * at the same offset.
1365 if ((iph
->protocol
^ iph2
->protocol
) |
1366 ((__force u32
)iph
->saddr
^ (__force u32
)iph2
->saddr
) |
1367 ((__force u32
)iph
->daddr
^ (__force u32
)iph2
->daddr
)) {
1368 NAPI_GRO_CB(p
)->same_flow
= 0;
1372 /* All fields must match except length and checksum. */
1373 NAPI_GRO_CB(p
)->flush
|=
1374 (iph
->ttl
^ iph2
->ttl
) |
1375 (iph
->tos
^ iph2
->tos
) |
1376 ((iph
->frag_off
^ iph2
->frag_off
) & htons(IP_DF
));
1378 NAPI_GRO_CB(p
)->flush
|= flush
;
1380 /* We need to store of the IP ID check to be included later
1381 * when we can verify that this packet does in fact belong
1384 flush_id
= (u16
)(id
- ntohs(iph2
->id
));
1386 /* This bit of code makes it much easier for us to identify
1387 * the cases where we are doing atomic vs non-atomic IP ID
1388 * checks. Specifically an atomic check can return IP ID
1389 * values 0 - 0xFFFF, while a non-atomic check can only
1390 * return 0 or 0xFFFF.
1392 if (!NAPI_GRO_CB(p
)->is_atomic
||
1393 !(iph
->frag_off
& htons(IP_DF
))) {
1394 flush_id
^= NAPI_GRO_CB(p
)->count
;
1395 flush_id
= flush_id
? 0xFFFF : 0;
1398 /* If the previous IP ID value was based on an atomic
1399 * datagram we can overwrite the value and ignore it.
1401 if (NAPI_GRO_CB(skb
)->is_atomic
)
1402 NAPI_GRO_CB(p
)->flush_id
= flush_id
;
1404 NAPI_GRO_CB(p
)->flush_id
|= flush_id
;
1407 NAPI_GRO_CB(skb
)->is_atomic
= !!(iph
->frag_off
& htons(IP_DF
));
1408 NAPI_GRO_CB(skb
)->flush
|= flush
;
1409 skb_set_network_header(skb
, off
);
1410 /* The above will be needed by the transport layer if there is one
1411 * immediately following this IP hdr.
1414 /* Note : No need to call skb_gro_postpull_rcsum() here,
1415 * as we already checked checksum over ipv4 header was 0
1417 skb_gro_pull(skb
, sizeof(*iph
));
1418 skb_set_transport_header(skb
, skb_gro_offset(skb
));
1420 pp
= call_gro_receive(ops
->callbacks
.gro_receive
, head
, skb
);
1426 skb_gro_flush_final(skb
, pp
, flush
);
1430 EXPORT_SYMBOL(inet_gro_receive
);
1432 static struct sk_buff
**ipip_gro_receive(struct sk_buff
**head
,
1433 struct sk_buff
*skb
)
1435 if (NAPI_GRO_CB(skb
)->encap_mark
) {
1436 NAPI_GRO_CB(skb
)->flush
= 1;
1440 NAPI_GRO_CB(skb
)->encap_mark
= 1;
1442 return inet_gro_receive(head
, skb
);
1445 #define SECONDS_PER_DAY 86400
1447 /* inet_current_timestamp - Return IP network timestamp
1449 * Return milliseconds since midnight in network byte order.
1451 __be32
inet_current_timestamp(void)
1455 struct timespec64 ts
;
1457 ktime_get_real_ts64(&ts
);
1459 /* Get secs since midnight. */
1460 (void)div_u64_rem(ts
.tv_sec
, SECONDS_PER_DAY
, &secs
);
1461 /* Convert to msecs. */
1462 msecs
= secs
* MSEC_PER_SEC
;
1463 /* Convert nsec to msec. */
1464 msecs
+= (u32
)ts
.tv_nsec
/ NSEC_PER_MSEC
;
1466 /* Convert to network byte order. */
1467 return htonl(msecs
);
1469 EXPORT_SYMBOL(inet_current_timestamp
);
1471 int inet_recv_error(struct sock
*sk
, struct msghdr
*msg
, int len
, int *addr_len
)
1473 if (sk
->sk_family
== AF_INET
)
1474 return ip_recv_error(sk
, msg
, len
, addr_len
);
1475 #if IS_ENABLED(CONFIG_IPV6)
1476 if (sk
->sk_family
== AF_INET6
)
1477 return pingv6_ops
.ipv6_recv_error(sk
, msg
, len
, addr_len
);
1482 int inet_gro_complete(struct sk_buff
*skb
, int nhoff
)
1484 __be16 newlen
= htons(skb
->len
- nhoff
);
1485 struct iphdr
*iph
= (struct iphdr
*)(skb
->data
+ nhoff
);
1486 const struct net_offload
*ops
;
1487 int proto
= iph
->protocol
;
1490 if (skb
->encapsulation
)
1491 skb_set_inner_network_header(skb
, nhoff
);
1493 csum_replace2(&iph
->check
, iph
->tot_len
, newlen
);
1494 iph
->tot_len
= newlen
;
1497 ops
= rcu_dereference(inet_offloads
[proto
]);
1498 if (WARN_ON(!ops
|| !ops
->callbacks
.gro_complete
))
1501 /* Only need to add sizeof(*iph) to get to the next hdr below
1502 * because any hdr with option will have been flushed in
1503 * inet_gro_receive().
1505 err
= ops
->callbacks
.gro_complete(skb
, nhoff
+ sizeof(*iph
));
1512 EXPORT_SYMBOL(inet_gro_complete
);
1514 static int ipip_gro_complete(struct sk_buff
*skb
, int nhoff
)
1516 skb
->encapsulation
= 1;
1517 skb_shinfo(skb
)->gso_type
|= SKB_GSO_IPXIP4
;
1518 return inet_gro_complete(skb
, nhoff
);
1521 int inet_ctl_sock_create(struct sock
**sk
, unsigned short family
,
1522 unsigned short type
, unsigned char protocol
,
1525 struct socket
*sock
;
1526 int rc
= sock_create_kern(net
, family
, type
, protocol
, &sock
);
1530 (*sk
)->sk_allocation
= GFP_ATOMIC
;
1532 * Unhash it so that IP input processing does not even see it,
1533 * we do not wish this socket to see incoming packets.
1535 (*sk
)->sk_prot
->unhash(*sk
);
1539 EXPORT_SYMBOL_GPL(inet_ctl_sock_create
);
1541 u64
snmp_get_cpu_field(void __percpu
*mib
, int cpu
, int offt
)
1543 return *(((unsigned long *)per_cpu_ptr(mib
, cpu
)) + offt
);
1545 EXPORT_SYMBOL_GPL(snmp_get_cpu_field
);
1547 unsigned long snmp_fold_field(void __percpu
*mib
, int offt
)
1549 unsigned long res
= 0;
1552 for_each_possible_cpu(i
)
1553 res
+= snmp_get_cpu_field(mib
, i
, offt
);
1556 EXPORT_SYMBOL_GPL(snmp_fold_field
);
1558 #if BITS_PER_LONG==32
1560 u64
snmp_get_cpu_field64(void __percpu
*mib
, int cpu
, int offt
,
1561 size_t syncp_offset
)
1564 struct u64_stats_sync
*syncp
;
1568 bhptr
= per_cpu_ptr(mib
, cpu
);
1569 syncp
= (struct u64_stats_sync
*)(bhptr
+ syncp_offset
);
1571 start
= u64_stats_fetch_begin_irq(syncp
);
1572 v
= *(((u64
*)bhptr
) + offt
);
1573 } while (u64_stats_fetch_retry_irq(syncp
, start
));
1577 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64
);
1579 u64
snmp_fold_field64(void __percpu
*mib
, int offt
, size_t syncp_offset
)
1584 for_each_possible_cpu(cpu
) {
1585 res
+= snmp_get_cpu_field64(mib
, cpu
, offt
, syncp_offset
);
1589 EXPORT_SYMBOL_GPL(snmp_fold_field64
);
1592 #ifdef CONFIG_IP_MULTICAST
1593 static const struct net_protocol igmp_protocol
= {
1594 .handler
= igmp_rcv
,
1599 static const struct net_protocol tcp_protocol
= {
1600 .early_demux
= tcp_v4_early_demux
,
1601 .handler
= tcp_v4_rcv
,
1602 .err_handler
= tcp_v4_err
,
1605 .icmp_strict_tag_validation
= 1,
1608 static const struct net_protocol udp_protocol
= {
1609 .early_demux
= udp_v4_early_demux
,
1611 .err_handler
= udp_err
,
1616 static const struct net_protocol icmp_protocol
= {
1617 .handler
= icmp_rcv
,
1618 .err_handler
= icmp_err
,
1623 static __net_init
int ipv4_mib_init_net(struct net
*net
)
1627 net
->mib
.tcp_statistics
= alloc_percpu(struct tcp_mib
);
1628 if (!net
->mib
.tcp_statistics
)
1630 net
->mib
.ip_statistics
= alloc_percpu(struct ipstats_mib
);
1631 if (!net
->mib
.ip_statistics
)
1634 for_each_possible_cpu(i
) {
1635 struct ipstats_mib
*af_inet_stats
;
1636 af_inet_stats
= per_cpu_ptr(net
->mib
.ip_statistics
, i
);
1637 u64_stats_init(&af_inet_stats
->syncp
);
1640 net
->mib
.net_statistics
= alloc_percpu(struct linux_mib
);
1641 if (!net
->mib
.net_statistics
)
1643 net
->mib
.udp_statistics
= alloc_percpu(struct udp_mib
);
1644 if (!net
->mib
.udp_statistics
)
1646 net
->mib
.udplite_statistics
= alloc_percpu(struct udp_mib
);
1647 if (!net
->mib
.udplite_statistics
)
1648 goto err_udplite_mib
;
1649 net
->mib
.icmp_statistics
= alloc_percpu(struct icmp_mib
);
1650 if (!net
->mib
.icmp_statistics
)
1652 net
->mib
.icmpmsg_statistics
= kzalloc(sizeof(struct icmpmsg_mib
),
1654 if (!net
->mib
.icmpmsg_statistics
)
1655 goto err_icmpmsg_mib
;
1661 free_percpu(net
->mib
.icmp_statistics
);
1663 free_percpu(net
->mib
.udplite_statistics
);
1665 free_percpu(net
->mib
.udp_statistics
);
1667 free_percpu(net
->mib
.net_statistics
);
1669 free_percpu(net
->mib
.ip_statistics
);
1671 free_percpu(net
->mib
.tcp_statistics
);
1676 static __net_exit
void ipv4_mib_exit_net(struct net
*net
)
1678 kfree(net
->mib
.icmpmsg_statistics
);
1679 free_percpu(net
->mib
.icmp_statistics
);
1680 free_percpu(net
->mib
.udplite_statistics
);
1681 free_percpu(net
->mib
.udp_statistics
);
1682 free_percpu(net
->mib
.net_statistics
);
1683 free_percpu(net
->mib
.ip_statistics
);
1684 free_percpu(net
->mib
.tcp_statistics
);
1687 static __net_initdata
struct pernet_operations ipv4_mib_ops
= {
1688 .init
= ipv4_mib_init_net
,
1689 .exit
= ipv4_mib_exit_net
,
1692 static int __init
init_ipv4_mibs(void)
1694 return register_pernet_subsys(&ipv4_mib_ops
);
1697 static __net_init
int inet_init_net(struct net
*net
)
1700 * Set defaults for local port range
1702 seqlock_init(&net
->ipv4
.ip_local_ports
.lock
);
1703 net
->ipv4
.ip_local_ports
.range
[0] = 32768;
1704 net
->ipv4
.ip_local_ports
.range
[1] = 60999;
1706 seqlock_init(&net
->ipv4
.ping_group_range
.lock
);
1708 * Sane defaults - nobody may create ping sockets.
1709 * Boot scripts should set this to distro-specific group.
1711 net
->ipv4
.ping_group_range
.range
[0] = make_kgid(&init_user_ns
, 1);
1712 net
->ipv4
.ping_group_range
.range
[1] = make_kgid(&init_user_ns
, 0);
1714 /* Default values for sysctl-controlled parameters.
1715 * We set them here, in case sysctl is not compiled.
1717 net
->ipv4
.sysctl_ip_default_ttl
= IPDEFTTL
;
1718 net
->ipv4
.sysctl_ip_dynaddr
= 0;
1719 net
->ipv4
.sysctl_ip_early_demux
= 1;
1720 #ifdef CONFIG_SYSCTL
1721 net
->ipv4
.sysctl_ip_prot_sock
= PROT_SOCK
;
1727 static __net_exit
void inet_exit_net(struct net
*net
)
1731 static __net_initdata
struct pernet_operations af_inet_ops
= {
1732 .init
= inet_init_net
,
1733 .exit
= inet_exit_net
,
1736 static int __init
init_inet_pernet_ops(void)
1738 return register_pernet_subsys(&af_inet_ops
);
1741 static int ipv4_proc_init(void);
1744 * IP protocol layer initialiser
1747 static struct packet_offload ip_packet_offload __read_mostly
= {
1748 .type
= cpu_to_be16(ETH_P_IP
),
1750 .gso_segment
= inet_gso_segment
,
1751 .gro_receive
= inet_gro_receive
,
1752 .gro_complete
= inet_gro_complete
,
1756 static const struct net_offload ipip_offload
= {
1758 .gso_segment
= inet_gso_segment
,
1759 .gro_receive
= ipip_gro_receive
,
1760 .gro_complete
= ipip_gro_complete
,
1764 static int __init
ipv4_offload_init(void)
1769 if (udpv4_offload_init() < 0)
1770 pr_crit("%s: Cannot add UDP protocol offload\n", __func__
);
1771 if (tcpv4_offload_init() < 0)
1772 pr_crit("%s: Cannot add TCP protocol offload\n", __func__
);
1774 dev_add_offload(&ip_packet_offload
);
1775 inet_add_offload(&ipip_offload
, IPPROTO_IPIP
);
1779 fs_initcall(ipv4_offload_init
);
1781 static struct packet_type ip_packet_type __read_mostly
= {
1782 .type
= cpu_to_be16(ETH_P_IP
),
1786 static int __init
inet_init(void)
1788 struct inet_protosw
*q
;
1789 struct list_head
*r
;
1792 sock_skb_cb_check_size(sizeof(struct inet_skb_parm
));
1794 rc
= proto_register(&tcp_prot
, 1);
1798 rc
= proto_register(&udp_prot
, 1);
1800 goto out_unregister_tcp_proto
;
1802 rc
= proto_register(&raw_prot
, 1);
1804 goto out_unregister_udp_proto
;
1806 rc
= proto_register(&ping_prot
, 1);
1808 goto out_unregister_raw_proto
;
1811 * Tell SOCKET that we are alive...
1814 (void)sock_register(&inet_family_ops
);
1816 #ifdef CONFIG_SYSCTL
1817 ip_static_sysctl_init();
1821 * Add all the base protocols.
1824 if (inet_add_protocol(&icmp_protocol
, IPPROTO_ICMP
) < 0)
1825 pr_crit("%s: Cannot add ICMP protocol\n", __func__
);
1826 if (inet_add_protocol(&udp_protocol
, IPPROTO_UDP
) < 0)
1827 pr_crit("%s: Cannot add UDP protocol\n", __func__
);
1828 if (inet_add_protocol(&tcp_protocol
, IPPROTO_TCP
) < 0)
1829 pr_crit("%s: Cannot add TCP protocol\n", __func__
);
1830 #ifdef CONFIG_IP_MULTICAST
1831 if (inet_add_protocol(&igmp_protocol
, IPPROTO_IGMP
) < 0)
1832 pr_crit("%s: Cannot add IGMP protocol\n", __func__
);
1835 /* Register the socket-side information for inet_create. */
1836 for (r
= &inetsw
[0]; r
< &inetsw
[SOCK_MAX
]; ++r
)
1839 for (q
= inetsw_array
; q
< &inetsw_array
[INETSW_ARRAY_LEN
]; ++q
)
1840 inet_register_protosw(q
);
1843 * Set the ARP module up
1849 * Set the IP module up
1854 /* Setup TCP slab cache for open requests. */
1857 /* Setup UDP memory threshold */
1860 /* Add UDP-Lite (RFC 3828) */
1861 udplite4_register();
1866 * Set the ICMP layer up
1869 if (icmp_init() < 0)
1870 panic("Failed to create the ICMP control socket.\n");
1873 * Initialise the multicast router
1875 #if defined(CONFIG_IP_MROUTE)
1877 pr_crit("%s: Cannot init ipv4 mroute\n", __func__
);
1880 if (init_inet_pernet_ops())
1881 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__
);
1883 * Initialise per-cpu ipv4 mibs
1886 if (init_ipv4_mibs())
1887 pr_crit("%s: Cannot init ipv4 mibs\n", __func__
);
1893 dev_add_pack(&ip_packet_type
);
1895 ip_tunnel_core_init();
1900 out_unregister_raw_proto
:
1901 proto_unregister(&raw_prot
);
1902 out_unregister_udp_proto
:
1903 proto_unregister(&udp_prot
);
1904 out_unregister_tcp_proto
:
1905 proto_unregister(&tcp_prot
);
1909 fs_initcall(inet_init
);
1911 /* ------------------------------------------------------------------------ */
1913 #ifdef CONFIG_PROC_FS
1914 static int __init
ipv4_proc_init(void)
1918 if (raw_proc_init())
1920 if (tcp4_proc_init())
1922 if (udp4_proc_init())
1924 if (ping_proc_init())
1926 if (ip_misc_proc_init())
1943 #else /* CONFIG_PROC_FS */
1944 static int __init
ipv4_proc_init(void)
1948 #endif /* CONFIG_PROC_FS */