net - IP_NODEFRAG option for IPv4 socket
[linux-3.10.git] / net / ipv4 / af_inet.c
1 /*
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.
5  *
6  *              PF_INET protocol family socket handler.
7  *
8  * Authors:     Ross Biro
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>
12  *
13  * Changes (see also sock.c)
14  *
15  *              piggy,
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
23  *                                      structures
24  *                                      when accept() ed
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
30  *              Alan Cox,
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
40  *                                      compactness.
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
46  *                                      dumbly.
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.
61  *
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.
66  */
67
68 #include <linux/err.h>
69 #include <linux/errno.h>
70 #include <linux/types.h>
71 #include <linux/socket.h>
72 #include <linux/in.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>
82 #include <linux/mm.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>
89 #include <linux/slab.h>
90
91 #include <asm/uaccess.h>
92 #include <asm/system.h>
93
94 #include <linux/inet.h>
95 #include <linux/igmp.h>
96 #include <linux/inetdevice.h>
97 #include <linux/netdevice.h>
98 #include <net/checksum.h>
99 #include <net/ip.h>
100 #include <net/protocol.h>
101 #include <net/arp.h>
102 #include <net/route.h>
103 #include <net/ip_fib.h>
104 #include <net/inet_connection_sock.h>
105 #include <net/tcp.h>
106 #include <net/udp.h>
107 #include <net/udplite.h>
108 #include <linux/skbuff.h>
109 #include <net/sock.h>
110 #include <net/raw.h>
111 #include <net/icmp.h>
112 #include <net/ipip.h>
113 #include <net/inet_common.h>
114 #include <net/xfrm.h>
115 #include <net/net_namespace.h>
116 #ifdef CONFIG_IP_MROUTE
117 #include <linux/mroute.h>
118 #endif
119
120
121 /* The inetsw table contains everything that inet_create needs to
122  * build a new socket.
123  */
124 static struct list_head inetsw[SOCK_MAX];
125 static DEFINE_SPINLOCK(inetsw_lock);
126
127 struct ipv4_config ipv4_config;
128 EXPORT_SYMBOL(ipv4_config);
129
130 /* New destruction routine */
131
132 void inet_sock_destruct(struct sock *sk)
133 {
134         struct inet_sock *inet = inet_sk(sk);
135
136         __skb_queue_purge(&sk->sk_receive_queue);
137         __skb_queue_purge(&sk->sk_error_queue);
138
139         sk_mem_reclaim(sk);
140
141         if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
142                 pr_err("Attempt to release TCP socket in state %d %p\n",
143                        sk->sk_state, sk);
144                 return;
145         }
146         if (!sock_flag(sk, SOCK_DEAD)) {
147                 pr_err("Attempt to release alive inet socket %p\n", sk);
148                 return;
149         }
150
151         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
152         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
153         WARN_ON(sk->sk_wmem_queued);
154         WARN_ON(sk->sk_forward_alloc);
155
156         kfree(inet->opt);
157         dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
158         sk_refcnt_debug_dec(sk);
159 }
160 EXPORT_SYMBOL(inet_sock_destruct);
161
162 /*
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
165  *      the work.
166  */
167
168 /*
169  *      Automatically bind an unbound socket.
170  */
171
172 static int inet_autobind(struct sock *sk)
173 {
174         struct inet_sock *inet;
175         /* We may need to bind the socket. */
176         lock_sock(sk);
177         inet = inet_sk(sk);
178         if (!inet->inet_num) {
179                 if (sk->sk_prot->get_port(sk, 0)) {
180                         release_sock(sk);
181                         return -EAGAIN;
182                 }
183                 inet->inet_sport = htons(inet->inet_num);
184         }
185         release_sock(sk);
186         return 0;
187 }
188
189 /*
190  *      Move a socket into listening state.
191  */
192 int inet_listen(struct socket *sock, int backlog)
193 {
194         struct sock *sk = sock->sk;
195         unsigned char old_state;
196         int err;
197
198         lock_sock(sk);
199
200         err = -EINVAL;
201         if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
202                 goto out;
203
204         old_state = sk->sk_state;
205         if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
206                 goto out;
207
208         /* Really, if the socket is already in listen state
209          * we can only allow the backlog to be adjusted.
210          */
211         if (old_state != TCP_LISTEN) {
212                 err = inet_csk_listen_start(sk, backlog);
213                 if (err)
214                         goto out;
215         }
216         sk->sk_max_ack_backlog = backlog;
217         err = 0;
218
219 out:
220         release_sock(sk);
221         return err;
222 }
223 EXPORT_SYMBOL(inet_listen);
224
225 u32 inet_ehash_secret __read_mostly;
226 EXPORT_SYMBOL(inet_ehash_secret);
227
228 /*
229  * inet_ehash_secret must be set exactly once
230  * Instead of using a dedicated spinlock, we (ab)use inetsw_lock
231  */
232 void build_ehash_secret(void)
233 {
234         u32 rnd;
235         do {
236                 get_random_bytes(&rnd, sizeof(rnd));
237         } while (rnd == 0);
238         spin_lock_bh(&inetsw_lock);
239         if (!inet_ehash_secret)
240                 inet_ehash_secret = rnd;
241         spin_unlock_bh(&inetsw_lock);
242 }
243 EXPORT_SYMBOL(build_ehash_secret);
244
245 static inline int inet_netns_ok(struct net *net, int protocol)
246 {
247         int hash;
248         const struct net_protocol *ipprot;
249
250         if (net_eq(net, &init_net))
251                 return 1;
252
253         hash = protocol & (MAX_INET_PROTOS - 1);
254         ipprot = rcu_dereference(inet_protos[hash]);
255
256         if (ipprot == NULL)
257                 /* raw IP is OK */
258                 return 1;
259         return ipprot->netns_ok;
260 }
261
262 /*
263  *      Create an inet socket.
264  */
265
266 static int inet_create(struct net *net, struct socket *sock, int protocol,
267                        int kern)
268 {
269         struct sock *sk;
270         struct inet_protosw *answer;
271         struct inet_sock *inet;
272         struct proto *answer_prot;
273         unsigned char answer_flags;
274         char answer_no_check;
275         int try_loading_module = 0;
276         int err;
277
278         if (unlikely(!inet_ehash_secret))
279                 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
280                         build_ehash_secret();
281
282         sock->state = SS_UNCONNECTED;
283
284         /* Look for the requested type/protocol pair. */
285 lookup_protocol:
286         err = -ESOCKTNOSUPPORT;
287         rcu_read_lock();
288         list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
289
290                 err = 0;
291                 /* Check the non-wild match. */
292                 if (protocol == answer->protocol) {
293                         if (protocol != IPPROTO_IP)
294                                 break;
295                 } else {
296                         /* Check for the two wild cases. */
297                         if (IPPROTO_IP == protocol) {
298                                 protocol = answer->protocol;
299                                 break;
300                         }
301                         if (IPPROTO_IP == answer->protocol)
302                                 break;
303                 }
304                 err = -EPROTONOSUPPORT;
305         }
306
307         if (unlikely(err)) {
308                 if (try_loading_module < 2) {
309                         rcu_read_unlock();
310                         /*
311                          * Be more specific, e.g. net-pf-2-proto-132-type-1
312                          * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
313                          */
314                         if (++try_loading_module == 1)
315                                 request_module("net-pf-%d-proto-%d-type-%d",
316                                                PF_INET, protocol, sock->type);
317                         /*
318                          * Fall back to generic, e.g. net-pf-2-proto-132
319                          * (net-pf-PF_INET-proto-IPPROTO_SCTP)
320                          */
321                         else
322                                 request_module("net-pf-%d-proto-%d",
323                                                PF_INET, protocol);
324                         goto lookup_protocol;
325                 } else
326                         goto out_rcu_unlock;
327         }
328
329         err = -EPERM;
330         if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
331                 goto out_rcu_unlock;
332
333         err = -EAFNOSUPPORT;
334         if (!inet_netns_ok(net, protocol))
335                 goto out_rcu_unlock;
336
337         sock->ops = answer->ops;
338         answer_prot = answer->prot;
339         answer_no_check = answer->no_check;
340         answer_flags = answer->flags;
341         rcu_read_unlock();
342
343         WARN_ON(answer_prot->slab == NULL);
344
345         err = -ENOBUFS;
346         sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
347         if (sk == NULL)
348                 goto out;
349
350         err = 0;
351         sk->sk_no_check = answer_no_check;
352         if (INET_PROTOSW_REUSE & answer_flags)
353                 sk->sk_reuse = 1;
354
355         inet = inet_sk(sk);
356         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
357
358         inet->nodefrag = 0;
359
360         if (SOCK_RAW == sock->type) {
361                 inet->inet_num = protocol;
362                 if (IPPROTO_RAW == protocol)
363                         inet->hdrincl = 1;
364         }
365
366         if (ipv4_config.no_pmtu_disc)
367                 inet->pmtudisc = IP_PMTUDISC_DONT;
368         else
369                 inet->pmtudisc = IP_PMTUDISC_WANT;
370
371         inet->inet_id = 0;
372
373         sock_init_data(sock, sk);
374
375         sk->sk_destruct    = inet_sock_destruct;
376         sk->sk_protocol    = protocol;
377         sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
378
379         inet->uc_ttl    = -1;
380         inet->mc_loop   = 1;
381         inet->mc_ttl    = 1;
382         inet->mc_all    = 1;
383         inet->mc_index  = 0;
384         inet->mc_list   = NULL;
385
386         sk_refcnt_debug_inc(sk);
387
388         if (inet->inet_num) {
389                 /* It assumes that any protocol which allows
390                  * the user to assign a number at socket
391                  * creation time automatically
392                  * shares.
393                  */
394                 inet->inet_sport = htons(inet->inet_num);
395                 /* Add to protocol hash chains. */
396                 sk->sk_prot->hash(sk);
397         }
398
399         if (sk->sk_prot->init) {
400                 err = sk->sk_prot->init(sk);
401                 if (err)
402                         sk_common_release(sk);
403         }
404 out:
405         return err;
406 out_rcu_unlock:
407         rcu_read_unlock();
408         goto out;
409 }
410
411
412 /*
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.
416  */
417 int inet_release(struct socket *sock)
418 {
419         struct sock *sk = sock->sk;
420
421         if (sk) {
422                 long timeout;
423
424                 sock_rps_reset_flow(sk);
425
426                 /* Applications forget to leave groups before exiting */
427                 ip_mc_drop_socket(sk);
428
429                 /* If linger is set, we don't return until the close
430                  * is complete.  Otherwise we return immediately. The
431                  * actually closing is done the same either way.
432                  *
433                  * If the close is due to the process exiting, we never
434                  * linger..
435                  */
436                 timeout = 0;
437                 if (sock_flag(sk, SOCK_LINGER) &&
438                     !(current->flags & PF_EXITING))
439                         timeout = sk->sk_lingertime;
440                 sock->sk = NULL;
441                 sk->sk_prot->close(sk, timeout);
442         }
443         return 0;
444 }
445 EXPORT_SYMBOL(inet_release);
446
447 /* It is off by default, see below. */
448 int sysctl_ip_nonlocal_bind __read_mostly;
449 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
450
451 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
452 {
453         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
454         struct sock *sk = sock->sk;
455         struct inet_sock *inet = inet_sk(sk);
456         unsigned short snum;
457         int chk_addr_ret;
458         int err;
459
460         /* If the socket has its own bind function then use it. (RAW) */
461         if (sk->sk_prot->bind) {
462                 err = sk->sk_prot->bind(sk, uaddr, addr_len);
463                 goto out;
464         }
465         err = -EINVAL;
466         if (addr_len < sizeof(struct sockaddr_in))
467                 goto out;
468
469         chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
470
471         /* Not specified by any standard per-se, however it breaks too
472          * many applications when removed.  It is unfortunate since
473          * allowing applications to make a non-local bind solves
474          * several problems with systems using dynamic addressing.
475          * (ie. your servers still start up even if your ISDN link
476          *  is temporarily down)
477          */
478         err = -EADDRNOTAVAIL;
479         if (!sysctl_ip_nonlocal_bind &&
480             !(inet->freebind || inet->transparent) &&
481             addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
482             chk_addr_ret != RTN_LOCAL &&
483             chk_addr_ret != RTN_MULTICAST &&
484             chk_addr_ret != RTN_BROADCAST)
485                 goto out;
486
487         snum = ntohs(addr->sin_port);
488         err = -EACCES;
489         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
490                 goto out;
491
492         /*      We keep a pair of addresses. rcv_saddr is the one
493          *      used by hash lookups, and saddr is used for transmit.
494          *
495          *      In the BSD API these are the same except where it
496          *      would be illegal to use them (multicast/broadcast) in
497          *      which case the sending device address is used.
498          */
499         lock_sock(sk);
500
501         /* Check these errors (active socket, double bind). */
502         err = -EINVAL;
503         if (sk->sk_state != TCP_CLOSE || inet->inet_num)
504                 goto out_release_sock;
505
506         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
507         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
508                 inet->inet_saddr = 0;  /* Use device */
509
510         /* Make sure we are allowed to bind here. */
511         if (sk->sk_prot->get_port(sk, snum)) {
512                 inet->inet_saddr = inet->inet_rcv_saddr = 0;
513                 err = -EADDRINUSE;
514                 goto out_release_sock;
515         }
516
517         if (inet->inet_rcv_saddr)
518                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
519         if (snum)
520                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
521         inet->inet_sport = htons(inet->inet_num);
522         inet->inet_daddr = 0;
523         inet->inet_dport = 0;
524         sk_dst_reset(sk);
525         err = 0;
526 out_release_sock:
527         release_sock(sk);
528 out:
529         return err;
530 }
531 EXPORT_SYMBOL(inet_bind);
532
533 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
534                        int addr_len, int flags)
535 {
536         struct sock *sk = sock->sk;
537
538         if (addr_len < sizeof(uaddr->sa_family))
539                 return -EINVAL;
540         if (uaddr->sa_family == AF_UNSPEC)
541                 return sk->sk_prot->disconnect(sk, flags);
542
543         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
544                 return -EAGAIN;
545         return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
546 }
547 EXPORT_SYMBOL(inet_dgram_connect);
548
549 static long inet_wait_for_connect(struct sock *sk, long timeo)
550 {
551         DEFINE_WAIT(wait);
552
553         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
554
555         /* Basic assumption: if someone sets sk->sk_err, he _must_
556          * change state of the socket from TCP_SYN_*.
557          * Connect() does not allow to get error notifications
558          * without closing the socket.
559          */
560         while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
561                 release_sock(sk);
562                 timeo = schedule_timeout(timeo);
563                 lock_sock(sk);
564                 if (signal_pending(current) || !timeo)
565                         break;
566                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
567         }
568         finish_wait(sk_sleep(sk), &wait);
569         return timeo;
570 }
571
572 /*
573  *      Connect to a remote host. There is regrettably still a little
574  *      TCP 'magic' in here.
575  */
576 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
577                         int addr_len, int flags)
578 {
579         struct sock *sk = sock->sk;
580         int err;
581         long timeo;
582
583         if (addr_len < sizeof(uaddr->sa_family))
584                 return -EINVAL;
585
586         lock_sock(sk);
587
588         if (uaddr->sa_family == AF_UNSPEC) {
589                 err = sk->sk_prot->disconnect(sk, flags);
590                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
591                 goto out;
592         }
593
594         switch (sock->state) {
595         default:
596                 err = -EINVAL;
597                 goto out;
598         case SS_CONNECTED:
599                 err = -EISCONN;
600                 goto out;
601         case SS_CONNECTING:
602                 err = -EALREADY;
603                 /* Fall out of switch with err, set for this state */
604                 break;
605         case SS_UNCONNECTED:
606                 err = -EISCONN;
607                 if (sk->sk_state != TCP_CLOSE)
608                         goto out;
609
610                 err = sk->sk_prot->connect(sk, uaddr, addr_len);
611                 if (err < 0)
612                         goto out;
613
614                 sock->state = SS_CONNECTING;
615
616                 /* Just entered SS_CONNECTING state; the only
617                  * difference is that return value in non-blocking
618                  * case is EINPROGRESS, rather than EALREADY.
619                  */
620                 err = -EINPROGRESS;
621                 break;
622         }
623
624         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
625
626         if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
627                 /* Error code is set above */
628                 if (!timeo || !inet_wait_for_connect(sk, timeo))
629                         goto out;
630
631                 err = sock_intr_errno(timeo);
632                 if (signal_pending(current))
633                         goto out;
634         }
635
636         /* Connection was closed by RST, timeout, ICMP error
637          * or another process disconnected us.
638          */
639         if (sk->sk_state == TCP_CLOSE)
640                 goto sock_error;
641
642         /* sk->sk_err may be not zero now, if RECVERR was ordered by user
643          * and error was received after socket entered established state.
644          * Hence, it is handled normally after connect() return successfully.
645          */
646
647         sock->state = SS_CONNECTED;
648         err = 0;
649 out:
650         release_sock(sk);
651         return err;
652
653 sock_error:
654         err = sock_error(sk) ? : -ECONNABORTED;
655         sock->state = SS_UNCONNECTED;
656         if (sk->sk_prot->disconnect(sk, flags))
657                 sock->state = SS_DISCONNECTING;
658         goto out;
659 }
660 EXPORT_SYMBOL(inet_stream_connect);
661
662 /*
663  *      Accept a pending connection. The TCP layer now gives BSD semantics.
664  */
665
666 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
667 {
668         struct sock *sk1 = sock->sk;
669         int err = -EINVAL;
670         struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
671
672         if (!sk2)
673                 goto do_err;
674
675         lock_sock(sk2);
676
677         WARN_ON(!((1 << sk2->sk_state) &
678                   (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
679
680         sock_graft(sk2, newsock);
681
682         newsock->state = SS_CONNECTED;
683         err = 0;
684         release_sock(sk2);
685 do_err:
686         return err;
687 }
688 EXPORT_SYMBOL(inet_accept);
689
690
691 /*
692  *      This does both peername and sockname.
693  */
694 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
695                         int *uaddr_len, int peer)
696 {
697         struct sock *sk         = sock->sk;
698         struct inet_sock *inet  = inet_sk(sk);
699         DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
700
701         sin->sin_family = AF_INET;
702         if (peer) {
703                 if (!inet->inet_dport ||
704                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
705                      peer == 1))
706                         return -ENOTCONN;
707                 sin->sin_port = inet->inet_dport;
708                 sin->sin_addr.s_addr = inet->inet_daddr;
709         } else {
710                 __be32 addr = inet->inet_rcv_saddr;
711                 if (!addr)
712                         addr = inet->inet_saddr;
713                 sin->sin_port = inet->inet_sport;
714                 sin->sin_addr.s_addr = addr;
715         }
716         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
717         *uaddr_len = sizeof(*sin);
718         return 0;
719 }
720 EXPORT_SYMBOL(inet_getname);
721
722 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
723                  size_t size)
724 {
725         struct sock *sk = sock->sk;
726
727         sock_rps_record_flow(sk);
728
729         /* We may need to bind the socket. */
730         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
731                 return -EAGAIN;
732
733         return sk->sk_prot->sendmsg(iocb, sk, msg, size);
734 }
735 EXPORT_SYMBOL(inet_sendmsg);
736
737 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
738                              size_t size, int flags)
739 {
740         struct sock *sk = sock->sk;
741
742         sock_rps_record_flow(sk);
743
744         /* We may need to bind the socket. */
745         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
746                 return -EAGAIN;
747
748         if (sk->sk_prot->sendpage)
749                 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
750         return sock_no_sendpage(sock, page, offset, size, flags);
751 }
752
753 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
754                  size_t size, int flags)
755 {
756         struct sock *sk = sock->sk;
757         int addr_len = 0;
758         int err;
759
760         sock_rps_record_flow(sk);
761
762         err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
763                                    flags & ~MSG_DONTWAIT, &addr_len);
764         if (err >= 0)
765                 msg->msg_namelen = addr_len;
766         return err;
767 }
768 EXPORT_SYMBOL(inet_recvmsg);
769
770 int inet_shutdown(struct socket *sock, int how)
771 {
772         struct sock *sk = sock->sk;
773         int err = 0;
774
775         /* This should really check to make sure
776          * the socket is a TCP socket. (WHY AC...)
777          */
778         how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
779                        1->2 bit 2 snds.
780                        2->3 */
781         if ((how & ~SHUTDOWN_MASK) || !how)     /* MAXINT->0 */
782                 return -EINVAL;
783
784         lock_sock(sk);
785         if (sock->state == SS_CONNECTING) {
786                 if ((1 << sk->sk_state) &
787                     (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
788                         sock->state = SS_DISCONNECTING;
789                 else
790                         sock->state = SS_CONNECTED;
791         }
792
793         switch (sk->sk_state) {
794         case TCP_CLOSE:
795                 err = -ENOTCONN;
796                 /* Hack to wake up other listeners, who can poll for
797                    POLLHUP, even on eg. unconnected UDP sockets -- RR */
798         default:
799                 sk->sk_shutdown |= how;
800                 if (sk->sk_prot->shutdown)
801                         sk->sk_prot->shutdown(sk, how);
802                 break;
803
804         /* Remaining two branches are temporary solution for missing
805          * close() in multithreaded environment. It is _not_ a good idea,
806          * but we have no choice until close() is repaired at VFS level.
807          */
808         case TCP_LISTEN:
809                 if (!(how & RCV_SHUTDOWN))
810                         break;
811                 /* Fall through */
812         case TCP_SYN_SENT:
813                 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
814                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
815                 break;
816         }
817
818         /* Wake up anyone sleeping in poll. */
819         sk->sk_state_change(sk);
820         release_sock(sk);
821         return err;
822 }
823 EXPORT_SYMBOL(inet_shutdown);
824
825 /*
826  *      ioctl() calls you can issue on an INET socket. Most of these are
827  *      device configuration and stuff and very rarely used. Some ioctls
828  *      pass on to the socket itself.
829  *
830  *      NOTE: I like the idea of a module for the config stuff. ie ifconfig
831  *      loads the devconfigure module does its configuring and unloads it.
832  *      There's a good 20K of config code hanging around the kernel.
833  */
834
835 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
836 {
837         struct sock *sk = sock->sk;
838         int err = 0;
839         struct net *net = sock_net(sk);
840
841         switch (cmd) {
842         case SIOCGSTAMP:
843                 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
844                 break;
845         case SIOCGSTAMPNS:
846                 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
847                 break;
848         case SIOCADDRT:
849         case SIOCDELRT:
850         case SIOCRTMSG:
851                 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
852                 break;
853         case SIOCDARP:
854         case SIOCGARP:
855         case SIOCSARP:
856                 err = arp_ioctl(net, cmd, (void __user *)arg);
857                 break;
858         case SIOCGIFADDR:
859         case SIOCSIFADDR:
860         case SIOCGIFBRDADDR:
861         case SIOCSIFBRDADDR:
862         case SIOCGIFNETMASK:
863         case SIOCSIFNETMASK:
864         case SIOCGIFDSTADDR:
865         case SIOCSIFDSTADDR:
866         case SIOCSIFPFLAGS:
867         case SIOCGIFPFLAGS:
868         case SIOCSIFFLAGS:
869                 err = devinet_ioctl(net, cmd, (void __user *)arg);
870                 break;
871         default:
872                 if (sk->sk_prot->ioctl)
873                         err = sk->sk_prot->ioctl(sk, cmd, arg);
874                 else
875                         err = -ENOIOCTLCMD;
876                 break;
877         }
878         return err;
879 }
880 EXPORT_SYMBOL(inet_ioctl);
881
882 const struct proto_ops inet_stream_ops = {
883         .family            = PF_INET,
884         .owner             = THIS_MODULE,
885         .release           = inet_release,
886         .bind              = inet_bind,
887         .connect           = inet_stream_connect,
888         .socketpair        = sock_no_socketpair,
889         .accept            = inet_accept,
890         .getname           = inet_getname,
891         .poll              = tcp_poll,
892         .ioctl             = inet_ioctl,
893         .listen            = inet_listen,
894         .shutdown          = inet_shutdown,
895         .setsockopt        = sock_common_setsockopt,
896         .getsockopt        = sock_common_getsockopt,
897         .sendmsg           = tcp_sendmsg,
898         .recvmsg           = inet_recvmsg,
899         .mmap              = sock_no_mmap,
900         .sendpage          = tcp_sendpage,
901         .splice_read       = tcp_splice_read,
902 #ifdef CONFIG_COMPAT
903         .compat_setsockopt = compat_sock_common_setsockopt,
904         .compat_getsockopt = compat_sock_common_getsockopt,
905 #endif
906 };
907 EXPORT_SYMBOL(inet_stream_ops);
908
909 const struct proto_ops inet_dgram_ops = {
910         .family            = PF_INET,
911         .owner             = THIS_MODULE,
912         .release           = inet_release,
913         .bind              = inet_bind,
914         .connect           = inet_dgram_connect,
915         .socketpair        = sock_no_socketpair,
916         .accept            = sock_no_accept,
917         .getname           = inet_getname,
918         .poll              = udp_poll,
919         .ioctl             = inet_ioctl,
920         .listen            = sock_no_listen,
921         .shutdown          = inet_shutdown,
922         .setsockopt        = sock_common_setsockopt,
923         .getsockopt        = sock_common_getsockopt,
924         .sendmsg           = inet_sendmsg,
925         .recvmsg           = inet_recvmsg,
926         .mmap              = sock_no_mmap,
927         .sendpage          = inet_sendpage,
928 #ifdef CONFIG_COMPAT
929         .compat_setsockopt = compat_sock_common_setsockopt,
930         .compat_getsockopt = compat_sock_common_getsockopt,
931 #endif
932 };
933 EXPORT_SYMBOL(inet_dgram_ops);
934
935 /*
936  * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
937  * udp_poll
938  */
939 static const struct proto_ops inet_sockraw_ops = {
940         .family            = PF_INET,
941         .owner             = THIS_MODULE,
942         .release           = inet_release,
943         .bind              = inet_bind,
944         .connect           = inet_dgram_connect,
945         .socketpair        = sock_no_socketpair,
946         .accept            = sock_no_accept,
947         .getname           = inet_getname,
948         .poll              = datagram_poll,
949         .ioctl             = inet_ioctl,
950         .listen            = sock_no_listen,
951         .shutdown          = inet_shutdown,
952         .setsockopt        = sock_common_setsockopt,
953         .getsockopt        = sock_common_getsockopt,
954         .sendmsg           = inet_sendmsg,
955         .recvmsg           = inet_recvmsg,
956         .mmap              = sock_no_mmap,
957         .sendpage          = inet_sendpage,
958 #ifdef CONFIG_COMPAT
959         .compat_setsockopt = compat_sock_common_setsockopt,
960         .compat_getsockopt = compat_sock_common_getsockopt,
961 #endif
962 };
963
964 static const struct net_proto_family inet_family_ops = {
965         .family = PF_INET,
966         .create = inet_create,
967         .owner  = THIS_MODULE,
968 };
969
970 /* Upon startup we insert all the elements in inetsw_array[] into
971  * the linked list inetsw.
972  */
973 static struct inet_protosw inetsw_array[] =
974 {
975         {
976                 .type =       SOCK_STREAM,
977                 .protocol =   IPPROTO_TCP,
978                 .prot =       &tcp_prot,
979                 .ops =        &inet_stream_ops,
980                 .no_check =   0,
981                 .flags =      INET_PROTOSW_PERMANENT |
982                               INET_PROTOSW_ICSK,
983         },
984
985         {
986                 .type =       SOCK_DGRAM,
987                 .protocol =   IPPROTO_UDP,
988                 .prot =       &udp_prot,
989                 .ops =        &inet_dgram_ops,
990                 .no_check =   UDP_CSUM_DEFAULT,
991                 .flags =      INET_PROTOSW_PERMANENT,
992        },
993
994
995        {
996                .type =       SOCK_RAW,
997                .protocol =   IPPROTO_IP,        /* wild card */
998                .prot =       &raw_prot,
999                .ops =        &inet_sockraw_ops,
1000                .no_check =   UDP_CSUM_DEFAULT,
1001                .flags =      INET_PROTOSW_REUSE,
1002        }
1003 };
1004
1005 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1006
1007 void inet_register_protosw(struct inet_protosw *p)
1008 {
1009         struct list_head *lh;
1010         struct inet_protosw *answer;
1011         int protocol = p->protocol;
1012         struct list_head *last_perm;
1013
1014         spin_lock_bh(&inetsw_lock);
1015
1016         if (p->type >= SOCK_MAX)
1017                 goto out_illegal;
1018
1019         /* If we are trying to override a permanent protocol, bail. */
1020         answer = NULL;
1021         last_perm = &inetsw[p->type];
1022         list_for_each(lh, &inetsw[p->type]) {
1023                 answer = list_entry(lh, struct inet_protosw, list);
1024
1025                 /* Check only the non-wild match. */
1026                 if (INET_PROTOSW_PERMANENT & answer->flags) {
1027                         if (protocol == answer->protocol)
1028                                 break;
1029                         last_perm = lh;
1030                 }
1031
1032                 answer = NULL;
1033         }
1034         if (answer)
1035                 goto out_permanent;
1036
1037         /* Add the new entry after the last permanent entry if any, so that
1038          * the new entry does not override a permanent entry when matched with
1039          * a wild-card protocol. But it is allowed to override any existing
1040          * non-permanent entry.  This means that when we remove this entry, the
1041          * system automatically returns to the old behavior.
1042          */
1043         list_add_rcu(&p->list, last_perm);
1044 out:
1045         spin_unlock_bh(&inetsw_lock);
1046
1047         return;
1048
1049 out_permanent:
1050         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
1051                protocol);
1052         goto out;
1053
1054 out_illegal:
1055         printk(KERN_ERR
1056                "Ignoring attempt to register invalid socket type %d.\n",
1057                p->type);
1058         goto out;
1059 }
1060 EXPORT_SYMBOL(inet_register_protosw);
1061
1062 void inet_unregister_protosw(struct inet_protosw *p)
1063 {
1064         if (INET_PROTOSW_PERMANENT & p->flags) {
1065                 printk(KERN_ERR
1066                        "Attempt to unregister permanent protocol %d.\n",
1067                        p->protocol);
1068         } else {
1069                 spin_lock_bh(&inetsw_lock);
1070                 list_del_rcu(&p->list);
1071                 spin_unlock_bh(&inetsw_lock);
1072
1073                 synchronize_net();
1074         }
1075 }
1076 EXPORT_SYMBOL(inet_unregister_protosw);
1077
1078 /*
1079  *      Shall we try to damage output packets if routing dev changes?
1080  */
1081
1082 int sysctl_ip_dynaddr __read_mostly;
1083
1084 static int inet_sk_reselect_saddr(struct sock *sk)
1085 {
1086         struct inet_sock *inet = inet_sk(sk);
1087         int err;
1088         struct rtable *rt;
1089         __be32 old_saddr = inet->inet_saddr;
1090         __be32 new_saddr;
1091         __be32 daddr = inet->inet_daddr;
1092
1093         if (inet->opt && inet->opt->srr)
1094                 daddr = inet->opt->faddr;
1095
1096         /* Query new route. */
1097         err = ip_route_connect(&rt, daddr, 0,
1098                                RT_CONN_FLAGS(sk),
1099                                sk->sk_bound_dev_if,
1100                                sk->sk_protocol,
1101                                inet->inet_sport, inet->inet_dport, sk, 0);
1102         if (err)
1103                 return err;
1104
1105         sk_setup_caps(sk, &rt->dst);
1106
1107         new_saddr = rt->rt_src;
1108
1109         if (new_saddr == old_saddr)
1110                 return 0;
1111
1112         if (sysctl_ip_dynaddr > 1) {
1113                 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n",
1114                        __func__, &old_saddr, &new_saddr);
1115         }
1116
1117         inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1118
1119         /*
1120          * XXX The only one ugly spot where we need to
1121          * XXX really change the sockets identity after
1122          * XXX it has entered the hashes. -DaveM
1123          *
1124          * Besides that, it does not check for connection
1125          * uniqueness. Wait for troubles.
1126          */
1127         __sk_prot_rehash(sk);
1128         return 0;
1129 }
1130
1131 int inet_sk_rebuild_header(struct sock *sk)
1132 {
1133         struct inet_sock *inet = inet_sk(sk);
1134         struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1135         __be32 daddr;
1136         int err;
1137
1138         /* Route is OK, nothing to do. */
1139         if (rt)
1140                 return 0;
1141
1142         /* Reroute. */
1143         daddr = inet->inet_daddr;
1144         if (inet->opt && inet->opt->srr)
1145                 daddr = inet->opt->faddr;
1146 {
1147         struct flowi fl = {
1148                 .oif = sk->sk_bound_dev_if,
1149                 .mark = sk->sk_mark,
1150                 .nl_u = {
1151                         .ip4_u = {
1152                                 .daddr  = daddr,
1153                                 .saddr  = inet->inet_saddr,
1154                                 .tos    = RT_CONN_FLAGS(sk),
1155                         },
1156                 },
1157                 .proto = sk->sk_protocol,
1158                 .flags = inet_sk_flowi_flags(sk),
1159                 .uli_u = {
1160                         .ports = {
1161                                 .sport = inet->inet_sport,
1162                                 .dport = inet->inet_dport,
1163                         },
1164                 },
1165         };
1166
1167         security_sk_classify_flow(sk, &fl);
1168         err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
1169 }
1170         if (!err)
1171                 sk_setup_caps(sk, &rt->dst);
1172         else {
1173                 /* Routing failed... */
1174                 sk->sk_route_caps = 0;
1175                 /*
1176                  * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1177                  * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1178                  */
1179                 if (!sysctl_ip_dynaddr ||
1180                     sk->sk_state != TCP_SYN_SENT ||
1181                     (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1182                     (err = inet_sk_reselect_saddr(sk)) != 0)
1183                         sk->sk_err_soft = -err;
1184         }
1185
1186         return err;
1187 }
1188 EXPORT_SYMBOL(inet_sk_rebuild_header);
1189
1190 static int inet_gso_send_check(struct sk_buff *skb)
1191 {
1192         struct iphdr *iph;
1193         const struct net_protocol *ops;
1194         int proto;
1195         int ihl;
1196         int err = -EINVAL;
1197
1198         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1199                 goto out;
1200
1201         iph = ip_hdr(skb);
1202         ihl = iph->ihl * 4;
1203         if (ihl < sizeof(*iph))
1204                 goto out;
1205
1206         if (unlikely(!pskb_may_pull(skb, ihl)))
1207                 goto out;
1208
1209         __skb_pull(skb, ihl);
1210         skb_reset_transport_header(skb);
1211         iph = ip_hdr(skb);
1212         proto = iph->protocol & (MAX_INET_PROTOS - 1);
1213         err = -EPROTONOSUPPORT;
1214
1215         rcu_read_lock();
1216         ops = rcu_dereference(inet_protos[proto]);
1217         if (likely(ops && ops->gso_send_check))
1218                 err = ops->gso_send_check(skb);
1219         rcu_read_unlock();
1220
1221 out:
1222         return err;
1223 }
1224
1225 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
1226 {
1227         struct sk_buff *segs = ERR_PTR(-EINVAL);
1228         struct iphdr *iph;
1229         const struct net_protocol *ops;
1230         int proto;
1231         int ihl;
1232         int id;
1233         unsigned int offset = 0;
1234
1235         if (!(features & NETIF_F_V4_CSUM))
1236                 features &= ~NETIF_F_SG;
1237
1238         if (unlikely(skb_shinfo(skb)->gso_type &
1239                      ~(SKB_GSO_TCPV4 |
1240                        SKB_GSO_UDP |
1241                        SKB_GSO_DODGY |
1242                        SKB_GSO_TCP_ECN |
1243                        0)))
1244                 goto out;
1245
1246         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1247                 goto out;
1248
1249         iph = ip_hdr(skb);
1250         ihl = iph->ihl * 4;
1251         if (ihl < sizeof(*iph))
1252                 goto out;
1253
1254         if (unlikely(!pskb_may_pull(skb, ihl)))
1255                 goto out;
1256
1257         __skb_pull(skb, ihl);
1258         skb_reset_transport_header(skb);
1259         iph = ip_hdr(skb);
1260         id = ntohs(iph->id);
1261         proto = iph->protocol & (MAX_INET_PROTOS - 1);
1262         segs = ERR_PTR(-EPROTONOSUPPORT);
1263
1264         rcu_read_lock();
1265         ops = rcu_dereference(inet_protos[proto]);
1266         if (likely(ops && ops->gso_segment))
1267                 segs = ops->gso_segment(skb, features);
1268         rcu_read_unlock();
1269
1270         if (!segs || IS_ERR(segs))
1271                 goto out;
1272
1273         skb = segs;
1274         do {
1275                 iph = ip_hdr(skb);
1276                 if (proto == IPPROTO_UDP) {
1277                         iph->id = htons(id);
1278                         iph->frag_off = htons(offset >> 3);
1279                         if (skb->next != NULL)
1280                                 iph->frag_off |= htons(IP_MF);
1281                         offset += (skb->len - skb->mac_len - iph->ihl * 4);
1282                 } else
1283                         iph->id = htons(id++);
1284                 iph->tot_len = htons(skb->len - skb->mac_len);
1285                 iph->check = 0;
1286                 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
1287         } while ((skb = skb->next));
1288
1289 out:
1290         return segs;
1291 }
1292
1293 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1294                                          struct sk_buff *skb)
1295 {
1296         const struct net_protocol *ops;
1297         struct sk_buff **pp = NULL;
1298         struct sk_buff *p;
1299         struct iphdr *iph;
1300         unsigned int hlen;
1301         unsigned int off;
1302         unsigned int id;
1303         int flush = 1;
1304         int proto;
1305
1306         off = skb_gro_offset(skb);
1307         hlen = off + sizeof(*iph);
1308         iph = skb_gro_header_fast(skb, off);
1309         if (skb_gro_header_hard(skb, hlen)) {
1310                 iph = skb_gro_header_slow(skb, hlen, off);
1311                 if (unlikely(!iph))
1312                         goto out;
1313         }
1314
1315         proto = iph->protocol & (MAX_INET_PROTOS - 1);
1316
1317         rcu_read_lock();
1318         ops = rcu_dereference(inet_protos[proto]);
1319         if (!ops || !ops->gro_receive)
1320                 goto out_unlock;
1321
1322         if (*(u8 *)iph != 0x45)
1323                 goto out_unlock;
1324
1325         if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1326                 goto out_unlock;
1327
1328         id = ntohl(*(__be32 *)&iph->id);
1329         flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
1330         id >>= 16;
1331
1332         for (p = *head; p; p = p->next) {
1333                 struct iphdr *iph2;
1334
1335                 if (!NAPI_GRO_CB(p)->same_flow)
1336                         continue;
1337
1338                 iph2 = ip_hdr(p);
1339
1340                 if ((iph->protocol ^ iph2->protocol) |
1341                     (iph->tos ^ iph2->tos) |
1342                     ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1343                     ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1344                         NAPI_GRO_CB(p)->same_flow = 0;
1345                         continue;
1346                 }
1347
1348                 /* All fields must match except length and checksum. */
1349                 NAPI_GRO_CB(p)->flush |=
1350                         (iph->ttl ^ iph2->ttl) |
1351                         ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1352
1353                 NAPI_GRO_CB(p)->flush |= flush;
1354         }
1355
1356         NAPI_GRO_CB(skb)->flush |= flush;
1357         skb_gro_pull(skb, sizeof(*iph));
1358         skb_set_transport_header(skb, skb_gro_offset(skb));
1359
1360         pp = ops->gro_receive(head, skb);
1361
1362 out_unlock:
1363         rcu_read_unlock();
1364
1365 out:
1366         NAPI_GRO_CB(skb)->flush |= flush;
1367
1368         return pp;
1369 }
1370
1371 static int inet_gro_complete(struct sk_buff *skb)
1372 {
1373         const struct net_protocol *ops;
1374         struct iphdr *iph = ip_hdr(skb);
1375         int proto = iph->protocol & (MAX_INET_PROTOS - 1);
1376         int err = -ENOSYS;
1377         __be16 newlen = htons(skb->len - skb_network_offset(skb));
1378
1379         csum_replace2(&iph->check, iph->tot_len, newlen);
1380         iph->tot_len = newlen;
1381
1382         rcu_read_lock();
1383         ops = rcu_dereference(inet_protos[proto]);
1384         if (WARN_ON(!ops || !ops->gro_complete))
1385                 goto out_unlock;
1386
1387         err = ops->gro_complete(skb);
1388
1389 out_unlock:
1390         rcu_read_unlock();
1391
1392         return err;
1393 }
1394
1395 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1396                          unsigned short type, unsigned char protocol,
1397                          struct net *net)
1398 {
1399         struct socket *sock;
1400         int rc = sock_create_kern(family, type, protocol, &sock);
1401
1402         if (rc == 0) {
1403                 *sk = sock->sk;
1404                 (*sk)->sk_allocation = GFP_ATOMIC;
1405                 /*
1406                  * Unhash it so that IP input processing does not even see it,
1407                  * we do not wish this socket to see incoming packets.
1408                  */
1409                 (*sk)->sk_prot->unhash(*sk);
1410
1411                 sk_change_net(*sk, net);
1412         }
1413         return rc;
1414 }
1415 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1416
1417 unsigned long snmp_fold_field(void __percpu *mib[], int offt)
1418 {
1419         unsigned long res = 0;
1420         int i;
1421
1422         for_each_possible_cpu(i) {
1423                 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
1424                 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
1425         }
1426         return res;
1427 }
1428 EXPORT_SYMBOL_GPL(snmp_fold_field);
1429
1430 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize)
1431 {
1432         BUG_ON(ptr == NULL);
1433         ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long));
1434         if (!ptr[0])
1435                 goto err0;
1436         ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long));
1437         if (!ptr[1])
1438                 goto err1;
1439         return 0;
1440 err1:
1441         free_percpu(ptr[0]);
1442         ptr[0] = NULL;
1443 err0:
1444         return -ENOMEM;
1445 }
1446 EXPORT_SYMBOL_GPL(snmp_mib_init);
1447
1448 void snmp_mib_free(void __percpu *ptr[2])
1449 {
1450         BUG_ON(ptr == NULL);
1451         free_percpu(ptr[0]);
1452         free_percpu(ptr[1]);
1453         ptr[0] = ptr[1] = NULL;
1454 }
1455 EXPORT_SYMBOL_GPL(snmp_mib_free);
1456
1457 #ifdef CONFIG_IP_MULTICAST
1458 static const struct net_protocol igmp_protocol = {
1459         .handler =      igmp_rcv,
1460         .netns_ok =     1,
1461 };
1462 #endif
1463
1464 static const struct net_protocol tcp_protocol = {
1465         .handler =      tcp_v4_rcv,
1466         .err_handler =  tcp_v4_err,
1467         .gso_send_check = tcp_v4_gso_send_check,
1468         .gso_segment =  tcp_tso_segment,
1469         .gro_receive =  tcp4_gro_receive,
1470         .gro_complete = tcp4_gro_complete,
1471         .no_policy =    1,
1472         .netns_ok =     1,
1473 };
1474
1475 static const struct net_protocol udp_protocol = {
1476         .handler =      udp_rcv,
1477         .err_handler =  udp_err,
1478         .gso_send_check = udp4_ufo_send_check,
1479         .gso_segment = udp4_ufo_fragment,
1480         .no_policy =    1,
1481         .netns_ok =     1,
1482 };
1483
1484 static const struct net_protocol icmp_protocol = {
1485         .handler =      icmp_rcv,
1486         .no_policy =    1,
1487         .netns_ok =     1,
1488 };
1489
1490 static __net_init int ipv4_mib_init_net(struct net *net)
1491 {
1492         if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics,
1493                           sizeof(struct tcp_mib)) < 0)
1494                 goto err_tcp_mib;
1495         if (snmp_mib_init((void __percpu **)net->mib.ip_statistics,
1496                           sizeof(struct ipstats_mib)) < 0)
1497                 goto err_ip_mib;
1498         if (snmp_mib_init((void __percpu **)net->mib.net_statistics,
1499                           sizeof(struct linux_mib)) < 0)
1500                 goto err_net_mib;
1501         if (snmp_mib_init((void __percpu **)net->mib.udp_statistics,
1502                           sizeof(struct udp_mib)) < 0)
1503                 goto err_udp_mib;
1504         if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics,
1505                           sizeof(struct udp_mib)) < 0)
1506                 goto err_udplite_mib;
1507         if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics,
1508                           sizeof(struct icmp_mib)) < 0)
1509                 goto err_icmp_mib;
1510         if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics,
1511                           sizeof(struct icmpmsg_mib)) < 0)
1512                 goto err_icmpmsg_mib;
1513
1514         tcp_mib_init(net);
1515         return 0;
1516
1517 err_icmpmsg_mib:
1518         snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1519 err_icmp_mib:
1520         snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1521 err_udplite_mib:
1522         snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1523 err_udp_mib:
1524         snmp_mib_free((void __percpu **)net->mib.net_statistics);
1525 err_net_mib:
1526         snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1527 err_ip_mib:
1528         snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
1529 err_tcp_mib:
1530         return -ENOMEM;
1531 }
1532
1533 static __net_exit void ipv4_mib_exit_net(struct net *net)
1534 {
1535         snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics);
1536         snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
1537         snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
1538         snmp_mib_free((void __percpu **)net->mib.udp_statistics);
1539         snmp_mib_free((void __percpu **)net->mib.net_statistics);
1540         snmp_mib_free((void __percpu **)net->mib.ip_statistics);
1541         snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
1542 }
1543
1544 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1545         .init = ipv4_mib_init_net,
1546         .exit = ipv4_mib_exit_net,
1547 };
1548
1549 static int __init init_ipv4_mibs(void)
1550 {
1551         return register_pernet_subsys(&ipv4_mib_ops);
1552 }
1553
1554 static int ipv4_proc_init(void);
1555
1556 /*
1557  *      IP protocol layer initialiser
1558  */
1559
1560 static struct packet_type ip_packet_type __read_mostly = {
1561         .type = cpu_to_be16(ETH_P_IP),
1562         .func = ip_rcv,
1563         .gso_send_check = inet_gso_send_check,
1564         .gso_segment = inet_gso_segment,
1565         .gro_receive = inet_gro_receive,
1566         .gro_complete = inet_gro_complete,
1567 };
1568
1569 static int __init inet_init(void)
1570 {
1571         struct sk_buff *dummy_skb;
1572         struct inet_protosw *q;
1573         struct list_head *r;
1574         int rc = -EINVAL;
1575
1576         BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
1577
1578         sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1579         if (!sysctl_local_reserved_ports)
1580                 goto out;
1581
1582         rc = proto_register(&tcp_prot, 1);
1583         if (rc)
1584                 goto out_free_reserved_ports;
1585
1586         rc = proto_register(&udp_prot, 1);
1587         if (rc)
1588                 goto out_unregister_tcp_proto;
1589
1590         rc = proto_register(&raw_prot, 1);
1591         if (rc)
1592                 goto out_unregister_udp_proto;
1593
1594         /*
1595          *      Tell SOCKET that we are alive...
1596          */
1597
1598         (void)sock_register(&inet_family_ops);
1599
1600 #ifdef CONFIG_SYSCTL
1601         ip_static_sysctl_init();
1602 #endif
1603
1604         /*
1605          *      Add all the base protocols.
1606          */
1607
1608         if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1609                 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1610         if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1611                 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1612         if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1613                 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1614 #ifdef CONFIG_IP_MULTICAST
1615         if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1616                 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1617 #endif
1618
1619         /* Register the socket-side information for inet_create. */
1620         for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1621                 INIT_LIST_HEAD(r);
1622
1623         for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1624                 inet_register_protosw(q);
1625
1626         /*
1627          *      Set the ARP module up
1628          */
1629
1630         arp_init();
1631
1632         /*
1633          *      Set the IP module up
1634          */
1635
1636         ip_init();
1637
1638         tcp_v4_init();
1639
1640         /* Setup TCP slab cache for open requests. */
1641         tcp_init();
1642
1643         /* Setup UDP memory threshold */
1644         udp_init();
1645
1646         /* Add UDP-Lite (RFC 3828) */
1647         udplite4_register();
1648
1649         /*
1650          *      Set the ICMP layer up
1651          */
1652
1653         if (icmp_init() < 0)
1654                 panic("Failed to create the ICMP control socket.\n");
1655
1656         /*
1657          *      Initialise the multicast router
1658          */
1659 #if defined(CONFIG_IP_MROUTE)
1660         if (ip_mr_init())
1661                 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n");
1662 #endif
1663         /*
1664          *      Initialise per-cpu ipv4 mibs
1665          */
1666
1667         if (init_ipv4_mibs())
1668                 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n");
1669
1670         ipv4_proc_init();
1671
1672         ipfrag_init();
1673
1674         dev_add_pack(&ip_packet_type);
1675
1676         rc = 0;
1677 out:
1678         return rc;
1679 out_unregister_udp_proto:
1680         proto_unregister(&udp_prot);
1681 out_unregister_tcp_proto:
1682         proto_unregister(&tcp_prot);
1683 out_free_reserved_ports:
1684         kfree(sysctl_local_reserved_ports);
1685         goto out;
1686 }
1687
1688 fs_initcall(inet_init);
1689
1690 /* ------------------------------------------------------------------------ */
1691
1692 #ifdef CONFIG_PROC_FS
1693 static int __init ipv4_proc_init(void)
1694 {
1695         int rc = 0;
1696
1697         if (raw_proc_init())
1698                 goto out_raw;
1699         if (tcp4_proc_init())
1700                 goto out_tcp;
1701         if (udp4_proc_init())
1702                 goto out_udp;
1703         if (ip_misc_proc_init())
1704                 goto out_misc;
1705 out:
1706         return rc;
1707 out_misc:
1708         udp4_proc_exit();
1709 out_udp:
1710         tcp4_proc_exit();
1711 out_tcp:
1712         raw_proc_exit();
1713 out_raw:
1714         rc = -ENOMEM;
1715         goto out;
1716 }
1717
1718 #else /* CONFIG_PROC_FS */
1719 static int __init ipv4_proc_init(void)
1720 {
1721         return 0;
1722 }
1723 #endif /* CONFIG_PROC_FS */
1724
1725 MODULE_ALIAS_NETPROTO(PF_INET);
1726