net: drop capability from protocol definitions
[linux-2.6.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
90 #include <asm/uaccess.h>
91 #include <asm/system.h>
92
93 #include <linux/inet.h>
94 #include <linux/igmp.h>
95 #include <linux/inetdevice.h>
96 #include <linux/netdevice.h>
97 #include <net/checksum.h>
98 #include <net/ip.h>
99 #include <net/protocol.h>
100 #include <net/arp.h>
101 #include <net/route.h>
102 #include <net/ip_fib.h>
103 #include <net/inet_connection_sock.h>
104 #include <net/tcp.h>
105 #include <net/udp.h>
106 #include <net/udplite.h>
107 #include <linux/skbuff.h>
108 #include <net/sock.h>
109 #include <net/raw.h>
110 #include <net/icmp.h>
111 #include <net/ipip.h>
112 #include <net/inet_common.h>
113 #include <net/xfrm.h>
114 #include <net/net_namespace.h>
115 #ifdef CONFIG_IP_MROUTE
116 #include <linux/mroute.h>
117 #endif
118
119
120 /* The inetsw table contains everything that inet_create needs to
121  * build a new socket.
122  */
123 static struct list_head inetsw[SOCK_MAX];
124 static DEFINE_SPINLOCK(inetsw_lock);
125
126 struct ipv4_config ipv4_config;
127 EXPORT_SYMBOL(ipv4_config);
128
129 /* New destruction routine */
130
131 void inet_sock_destruct(struct sock *sk)
132 {
133         struct inet_sock *inet = inet_sk(sk);
134
135         __skb_queue_purge(&sk->sk_receive_queue);
136         __skb_queue_purge(&sk->sk_error_queue);
137
138         sk_mem_reclaim(sk);
139
140         if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
141                 pr_err("Attempt to release TCP socket in state %d %p\n",
142                        sk->sk_state, sk);
143                 return;
144         }
145         if (!sock_flag(sk, SOCK_DEAD)) {
146                 pr_err("Attempt to release alive inet socket %p\n", sk);
147                 return;
148         }
149
150         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
151         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
152         WARN_ON(sk->sk_wmem_queued);
153         WARN_ON(sk->sk_forward_alloc);
154
155         kfree(inet->opt);
156         dst_release(sk->sk_dst_cache);
157         sk_refcnt_debug_dec(sk);
158 }
159 EXPORT_SYMBOL(inet_sock_destruct);
160
161 /*
162  *      The routines beyond this point handle the behaviour of an AF_INET
163  *      socket object. Mostly it punts to the subprotocols of IP to do
164  *      the work.
165  */
166
167 /*
168  *      Automatically bind an unbound socket.
169  */
170
171 static int inet_autobind(struct sock *sk)
172 {
173         struct inet_sock *inet;
174         /* We may need to bind the socket. */
175         lock_sock(sk);
176         inet = inet_sk(sk);
177         if (!inet->inet_num) {
178                 if (sk->sk_prot->get_port(sk, 0)) {
179                         release_sock(sk);
180                         return -EAGAIN;
181                 }
182                 inet->inet_sport = htons(inet->inet_num);
183         }
184         release_sock(sk);
185         return 0;
186 }
187
188 /*
189  *      Move a socket into listening state.
190  */
191 int inet_listen(struct socket *sock, int backlog)
192 {
193         struct sock *sk = sock->sk;
194         unsigned char old_state;
195         int err;
196
197         lock_sock(sk);
198
199         err = -EINVAL;
200         if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
201                 goto out;
202
203         old_state = sk->sk_state;
204         if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
205                 goto out;
206
207         /* Really, if the socket is already in listen state
208          * we can only allow the backlog to be adjusted.
209          */
210         if (old_state != TCP_LISTEN) {
211                 err = inet_csk_listen_start(sk, backlog);
212                 if (err)
213                         goto out;
214         }
215         sk->sk_max_ack_backlog = backlog;
216         err = 0;
217
218 out:
219         release_sock(sk);
220         return err;
221 }
222 EXPORT_SYMBOL(inet_listen);
223
224 u32 inet_ehash_secret __read_mostly;
225 EXPORT_SYMBOL(inet_ehash_secret);
226
227 /*
228  * inet_ehash_secret must be set exactly once
229  * Instead of using a dedicated spinlock, we (ab)use inetsw_lock
230  */
231 void build_ehash_secret(void)
232 {
233         u32 rnd;
234         do {
235                 get_random_bytes(&rnd, sizeof(rnd));
236         } while (rnd == 0);
237         spin_lock_bh(&inetsw_lock);
238         if (!inet_ehash_secret)
239                 inet_ehash_secret = rnd;
240         spin_unlock_bh(&inetsw_lock);
241 }
242 EXPORT_SYMBOL(build_ehash_secret);
243
244 static inline int inet_netns_ok(struct net *net, int protocol)
245 {
246         int hash;
247         const struct net_protocol *ipprot;
248
249         if (net_eq(net, &init_net))
250                 return 1;
251
252         hash = protocol & (MAX_INET_PROTOS - 1);
253         ipprot = rcu_dereference(inet_protos[hash]);
254
255         if (ipprot == NULL)
256                 /* raw IP is OK */
257                 return 1;
258         return ipprot->netns_ok;
259 }
260
261 /*
262  *      Create an inet socket.
263  */
264
265 static int inet_create(struct net *net, struct socket *sock, int protocol)
266 {
267         struct sock *sk;
268         struct inet_protosw *answer;
269         struct inet_sock *inet;
270         struct proto *answer_prot;
271         unsigned char answer_flags;
272         char answer_no_check;
273         int try_loading_module = 0;
274         int err;
275
276         if (unlikely(!inet_ehash_secret))
277                 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
278                         build_ehash_secret();
279
280         sock->state = SS_UNCONNECTED;
281
282         /* Look for the requested type/protocol pair. */
283 lookup_protocol:
284         err = -ESOCKTNOSUPPORT;
285         rcu_read_lock();
286         list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
287
288                 err = 0;
289                 /* Check the non-wild match. */
290                 if (protocol == answer->protocol) {
291                         if (protocol != IPPROTO_IP)
292                                 break;
293                 } else {
294                         /* Check for the two wild cases. */
295                         if (IPPROTO_IP == protocol) {
296                                 protocol = answer->protocol;
297                                 break;
298                         }
299                         if (IPPROTO_IP == answer->protocol)
300                                 break;
301                 }
302                 err = -EPROTONOSUPPORT;
303         }
304
305         if (unlikely(err)) {
306                 if (try_loading_module < 2) {
307                         rcu_read_unlock();
308                         /*
309                          * Be more specific, e.g. net-pf-2-proto-132-type-1
310                          * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
311                          */
312                         if (++try_loading_module == 1)
313                                 request_module("net-pf-%d-proto-%d-type-%d",
314                                                PF_INET, protocol, sock->type);
315                         /*
316                          * Fall back to generic, e.g. net-pf-2-proto-132
317                          * (net-pf-PF_INET-proto-IPPROTO_SCTP)
318                          */
319                         else
320                                 request_module("net-pf-%d-proto-%d",
321                                                PF_INET, protocol);
322                         goto lookup_protocol;
323                 } else
324                         goto out_rcu_unlock;
325         }
326
327         err = -EPERM;
328         if (sock->type == SOCK_RAW && !capable(CAP_NET_RAW))
329                 goto out_rcu_unlock;
330
331         err = -EAFNOSUPPORT;
332         if (!inet_netns_ok(net, protocol))
333                 goto out_rcu_unlock;
334
335         sock->ops = answer->ops;
336         answer_prot = answer->prot;
337         answer_no_check = answer->no_check;
338         answer_flags = answer->flags;
339         rcu_read_unlock();
340
341         WARN_ON(answer_prot->slab == NULL);
342
343         err = -ENOBUFS;
344         sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
345         if (sk == NULL)
346                 goto out;
347
348         err = 0;
349         sk->sk_no_check = answer_no_check;
350         if (INET_PROTOSW_REUSE & answer_flags)
351                 sk->sk_reuse = 1;
352
353         inet = inet_sk(sk);
354         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
355
356         if (SOCK_RAW == sock->type) {
357                 inet->inet_num = protocol;
358                 if (IPPROTO_RAW == protocol)
359                         inet->hdrincl = 1;
360         }
361
362         if (ipv4_config.no_pmtu_disc)
363                 inet->pmtudisc = IP_PMTUDISC_DONT;
364         else
365                 inet->pmtudisc = IP_PMTUDISC_WANT;
366
367         inet->inet_id = 0;
368
369         sock_init_data(sock, sk);
370
371         sk->sk_destruct    = inet_sock_destruct;
372         sk->sk_protocol    = protocol;
373         sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
374
375         inet->uc_ttl    = -1;
376         inet->mc_loop   = 1;
377         inet->mc_ttl    = 1;
378         inet->mc_all    = 1;
379         inet->mc_index  = 0;
380         inet->mc_list   = NULL;
381
382         sk_refcnt_debug_inc(sk);
383
384         if (inet->inet_num) {
385                 /* It assumes that any protocol which allows
386                  * the user to assign a number at socket
387                  * creation time automatically
388                  * shares.
389                  */
390                 inet->inet_sport = htons(inet->inet_num);
391                 /* Add to protocol hash chains. */
392                 sk->sk_prot->hash(sk);
393         }
394
395         if (sk->sk_prot->init) {
396                 err = sk->sk_prot->init(sk);
397                 if (err)
398                         sk_common_release(sk);
399         }
400 out:
401         return err;
402 out_rcu_unlock:
403         rcu_read_unlock();
404         goto out;
405 }
406
407
408 /*
409  *      The peer socket should always be NULL (or else). When we call this
410  *      function we are destroying the object and from then on nobody
411  *      should refer to it.
412  */
413 int inet_release(struct socket *sock)
414 {
415         struct sock *sk = sock->sk;
416
417         if (sk) {
418                 long timeout;
419
420                 /* Applications forget to leave groups before exiting */
421                 ip_mc_drop_socket(sk);
422
423                 /* If linger is set, we don't return until the close
424                  * is complete.  Otherwise we return immediately. The
425                  * actually closing is done the same either way.
426                  *
427                  * If the close is due to the process exiting, we never
428                  * linger..
429                  */
430                 timeout = 0;
431                 if (sock_flag(sk, SOCK_LINGER) &&
432                     !(current->flags & PF_EXITING))
433                         timeout = sk->sk_lingertime;
434                 sock->sk = NULL;
435                 sk->sk_prot->close(sk, timeout);
436         }
437         return 0;
438 }
439 EXPORT_SYMBOL(inet_release);
440
441 /* It is off by default, see below. */
442 int sysctl_ip_nonlocal_bind __read_mostly;
443 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
444
445 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
446 {
447         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
448         struct sock *sk = sock->sk;
449         struct inet_sock *inet = inet_sk(sk);
450         unsigned short snum;
451         int chk_addr_ret;
452         int err;
453
454         /* If the socket has its own bind function then use it. (RAW) */
455         if (sk->sk_prot->bind) {
456                 err = sk->sk_prot->bind(sk, uaddr, addr_len);
457                 goto out;
458         }
459         err = -EINVAL;
460         if (addr_len < sizeof(struct sockaddr_in))
461                 goto out;
462
463         chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
464
465         /* Not specified by any standard per-se, however it breaks too
466          * many applications when removed.  It is unfortunate since
467          * allowing applications to make a non-local bind solves
468          * several problems with systems using dynamic addressing.
469          * (ie. your servers still start up even if your ISDN link
470          *  is temporarily down)
471          */
472         err = -EADDRNOTAVAIL;
473         if (!sysctl_ip_nonlocal_bind &&
474             !(inet->freebind || inet->transparent) &&
475             addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
476             chk_addr_ret != RTN_LOCAL &&
477             chk_addr_ret != RTN_MULTICAST &&
478             chk_addr_ret != RTN_BROADCAST)
479                 goto out;
480
481         snum = ntohs(addr->sin_port);
482         err = -EACCES;
483         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
484                 goto out;
485
486         /*      We keep a pair of addresses. rcv_saddr is the one
487          *      used by hash lookups, and saddr is used for transmit.
488          *
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.
492          */
493         lock_sock(sk);
494
495         /* Check these errors (active socket, double bind). */
496         err = -EINVAL;
497         if (sk->sk_state != TCP_CLOSE || inet->inet_num)
498                 goto out_release_sock;
499
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 */
503
504         /* Make sure we are allowed to bind here. */
505         if (sk->sk_prot->get_port(sk, snum)) {
506                 inet->inet_saddr = inet->inet_rcv_saddr = 0;
507                 err = -EADDRINUSE;
508                 goto out_release_sock;
509         }
510
511         if (inet->inet_rcv_saddr)
512                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
513         if (snum)
514                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
515         inet->inet_sport = htons(inet->inet_num);
516         inet->inet_daddr = 0;
517         inet->inet_dport = 0;
518         sk_dst_reset(sk);
519         err = 0;
520 out_release_sock:
521         release_sock(sk);
522 out:
523         return err;
524 }
525 EXPORT_SYMBOL(inet_bind);
526
527 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
528                        int addr_len, int flags)
529 {
530         struct sock *sk = sock->sk;
531
532         if (uaddr->sa_family == AF_UNSPEC)
533                 return sk->sk_prot->disconnect(sk, flags);
534
535         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
536                 return -EAGAIN;
537         return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
538 }
539 EXPORT_SYMBOL(inet_dgram_connect);
540
541 static long inet_wait_for_connect(struct sock *sk, long timeo)
542 {
543         DEFINE_WAIT(wait);
544
545         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
546
547         /* Basic assumption: if someone sets sk->sk_err, he _must_
548          * change state of the socket from TCP_SYN_*.
549          * Connect() does not allow to get error notifications
550          * without closing the socket.
551          */
552         while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
553                 release_sock(sk);
554                 timeo = schedule_timeout(timeo);
555                 lock_sock(sk);
556                 if (signal_pending(current) || !timeo)
557                         break;
558                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
559         }
560         finish_wait(sk->sk_sleep, &wait);
561         return timeo;
562 }
563
564 /*
565  *      Connect to a remote host. There is regrettably still a little
566  *      TCP 'magic' in here.
567  */
568 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
569                         int addr_len, int flags)
570 {
571         struct sock *sk = sock->sk;
572         int err;
573         long timeo;
574
575         lock_sock(sk);
576
577         if (uaddr->sa_family == AF_UNSPEC) {
578                 err = sk->sk_prot->disconnect(sk, flags);
579                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
580                 goto out;
581         }
582
583         switch (sock->state) {
584         default:
585                 err = -EINVAL;
586                 goto out;
587         case SS_CONNECTED:
588                 err = -EISCONN;
589                 goto out;
590         case SS_CONNECTING:
591                 err = -EALREADY;
592                 /* Fall out of switch with err, set for this state */
593                 break;
594         case SS_UNCONNECTED:
595                 err = -EISCONN;
596                 if (sk->sk_state != TCP_CLOSE)
597                         goto out;
598
599                 err = sk->sk_prot->connect(sk, uaddr, addr_len);
600                 if (err < 0)
601                         goto out;
602
603                 sock->state = SS_CONNECTING;
604
605                 /* Just entered SS_CONNECTING state; the only
606                  * difference is that return value in non-blocking
607                  * case is EINPROGRESS, rather than EALREADY.
608                  */
609                 err = -EINPROGRESS;
610                 break;
611         }
612
613         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
614
615         if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
616                 /* Error code is set above */
617                 if (!timeo || !inet_wait_for_connect(sk, timeo))
618                         goto out;
619
620                 err = sock_intr_errno(timeo);
621                 if (signal_pending(current))
622                         goto out;
623         }
624
625         /* Connection was closed by RST, timeout, ICMP error
626          * or another process disconnected us.
627          */
628         if (sk->sk_state == TCP_CLOSE)
629                 goto sock_error;
630
631         /* sk->sk_err may be not zero now, if RECVERR was ordered by user
632          * and error was received after socket entered established state.
633          * Hence, it is handled normally after connect() return successfully.
634          */
635
636         sock->state = SS_CONNECTED;
637         err = 0;
638 out:
639         release_sock(sk);
640         return err;
641
642 sock_error:
643         err = sock_error(sk) ? : -ECONNABORTED;
644         sock->state = SS_UNCONNECTED;
645         if (sk->sk_prot->disconnect(sk, flags))
646                 sock->state = SS_DISCONNECTING;
647         goto out;
648 }
649 EXPORT_SYMBOL(inet_stream_connect);
650
651 /*
652  *      Accept a pending connection. The TCP layer now gives BSD semantics.
653  */
654
655 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
656 {
657         struct sock *sk1 = sock->sk;
658         int err = -EINVAL;
659         struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
660
661         if (!sk2)
662                 goto do_err;
663
664         lock_sock(sk2);
665
666         WARN_ON(!((1 << sk2->sk_state) &
667                   (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
668
669         sock_graft(sk2, newsock);
670
671         newsock->state = SS_CONNECTED;
672         err = 0;
673         release_sock(sk2);
674 do_err:
675         return err;
676 }
677 EXPORT_SYMBOL(inet_accept);
678
679
680 /*
681  *      This does both peername and sockname.
682  */
683 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
684                         int *uaddr_len, int peer)
685 {
686         struct sock *sk         = sock->sk;
687         struct inet_sock *inet  = inet_sk(sk);
688         DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
689
690         sin->sin_family = AF_INET;
691         if (peer) {
692                 if (!inet->inet_dport ||
693                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
694                      peer == 1))
695                         return -ENOTCONN;
696                 sin->sin_port = inet->inet_dport;
697                 sin->sin_addr.s_addr = inet->inet_daddr;
698         } else {
699                 __be32 addr = inet->inet_rcv_saddr;
700                 if (!addr)
701                         addr = inet->inet_saddr;
702                 sin->sin_port = inet->inet_sport;
703                 sin->sin_addr.s_addr = addr;
704         }
705         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
706         *uaddr_len = sizeof(*sin);
707         return 0;
708 }
709 EXPORT_SYMBOL(inet_getname);
710
711 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
712                  size_t size)
713 {
714         struct sock *sk = sock->sk;
715
716         /* We may need to bind the socket. */
717         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
718                 return -EAGAIN;
719
720         return sk->sk_prot->sendmsg(iocb, sk, msg, size);
721 }
722 EXPORT_SYMBOL(inet_sendmsg);
723
724
725 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
726                              size_t size, int flags)
727 {
728         struct sock *sk = sock->sk;
729
730         /* We may need to bind the socket. */
731         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
732                 return -EAGAIN;
733
734         if (sk->sk_prot->sendpage)
735                 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
736         return sock_no_sendpage(sock, page, offset, size, flags);
737 }
738
739
740 int inet_shutdown(struct socket *sock, int how)
741 {
742         struct sock *sk = sock->sk;
743         int err = 0;
744
745         /* This should really check to make sure
746          * the socket is a TCP socket. (WHY AC...)
747          */
748         how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
749                        1->2 bit 2 snds.
750                        2->3 */
751         if ((how & ~SHUTDOWN_MASK) || !how)     /* MAXINT->0 */
752                 return -EINVAL;
753
754         lock_sock(sk);
755         if (sock->state == SS_CONNECTING) {
756                 if ((1 << sk->sk_state) &
757                     (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
758                         sock->state = SS_DISCONNECTING;
759                 else
760                         sock->state = SS_CONNECTED;
761         }
762
763         switch (sk->sk_state) {
764         case TCP_CLOSE:
765                 err = -ENOTCONN;
766                 /* Hack to wake up other listeners, who can poll for
767                    POLLHUP, even on eg. unconnected UDP sockets -- RR */
768         default:
769                 sk->sk_shutdown |= how;
770                 if (sk->sk_prot->shutdown)
771                         sk->sk_prot->shutdown(sk, how);
772                 break;
773
774         /* Remaining two branches are temporary solution for missing
775          * close() in multithreaded environment. It is _not_ a good idea,
776          * but we have no choice until close() is repaired at VFS level.
777          */
778         case TCP_LISTEN:
779                 if (!(how & RCV_SHUTDOWN))
780                         break;
781                 /* Fall through */
782         case TCP_SYN_SENT:
783                 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
784                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
785                 break;
786         }
787
788         /* Wake up anyone sleeping in poll. */
789         sk->sk_state_change(sk);
790         release_sock(sk);
791         return err;
792 }
793 EXPORT_SYMBOL(inet_shutdown);
794
795 /*
796  *      ioctl() calls you can issue on an INET socket. Most of these are
797  *      device configuration and stuff and very rarely used. Some ioctls
798  *      pass on to the socket itself.
799  *
800  *      NOTE: I like the idea of a module for the config stuff. ie ifconfig
801  *      loads the devconfigure module does its configuring and unloads it.
802  *      There's a good 20K of config code hanging around the kernel.
803  */
804
805 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
806 {
807         struct sock *sk = sock->sk;
808         int err = 0;
809         struct net *net = sock_net(sk);
810
811         switch (cmd) {
812         case SIOCGSTAMP:
813                 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
814                 break;
815         case SIOCGSTAMPNS:
816                 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
817                 break;
818         case SIOCADDRT:
819         case SIOCDELRT:
820         case SIOCRTMSG:
821                 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
822                 break;
823         case SIOCDARP:
824         case SIOCGARP:
825         case SIOCSARP:
826                 err = arp_ioctl(net, cmd, (void __user *)arg);
827                 break;
828         case SIOCGIFADDR:
829         case SIOCSIFADDR:
830         case SIOCGIFBRDADDR:
831         case SIOCSIFBRDADDR:
832         case SIOCGIFNETMASK:
833         case SIOCSIFNETMASK:
834         case SIOCGIFDSTADDR:
835         case SIOCSIFDSTADDR:
836         case SIOCSIFPFLAGS:
837         case SIOCGIFPFLAGS:
838         case SIOCSIFFLAGS:
839                 err = devinet_ioctl(net, cmd, (void __user *)arg);
840                 break;
841         default:
842                 if (sk->sk_prot->ioctl)
843                         err = sk->sk_prot->ioctl(sk, cmd, arg);
844                 else
845                         err = -ENOIOCTLCMD;
846                 break;
847         }
848         return err;
849 }
850 EXPORT_SYMBOL(inet_ioctl);
851
852 const struct proto_ops inet_stream_ops = {
853         .family            = PF_INET,
854         .owner             = THIS_MODULE,
855         .release           = inet_release,
856         .bind              = inet_bind,
857         .connect           = inet_stream_connect,
858         .socketpair        = sock_no_socketpair,
859         .accept            = inet_accept,
860         .getname           = inet_getname,
861         .poll              = tcp_poll,
862         .ioctl             = inet_ioctl,
863         .listen            = inet_listen,
864         .shutdown          = inet_shutdown,
865         .setsockopt        = sock_common_setsockopt,
866         .getsockopt        = sock_common_getsockopt,
867         .sendmsg           = tcp_sendmsg,
868         .recvmsg           = sock_common_recvmsg,
869         .mmap              = sock_no_mmap,
870         .sendpage          = tcp_sendpage,
871         .splice_read       = tcp_splice_read,
872 #ifdef CONFIG_COMPAT
873         .compat_setsockopt = compat_sock_common_setsockopt,
874         .compat_getsockopt = compat_sock_common_getsockopt,
875 #endif
876 };
877 EXPORT_SYMBOL(inet_stream_ops);
878
879 const struct proto_ops inet_dgram_ops = {
880         .family            = PF_INET,
881         .owner             = THIS_MODULE,
882         .release           = inet_release,
883         .bind              = inet_bind,
884         .connect           = inet_dgram_connect,
885         .socketpair        = sock_no_socketpair,
886         .accept            = sock_no_accept,
887         .getname           = inet_getname,
888         .poll              = udp_poll,
889         .ioctl             = inet_ioctl,
890         .listen            = sock_no_listen,
891         .shutdown          = inet_shutdown,
892         .setsockopt        = sock_common_setsockopt,
893         .getsockopt        = sock_common_getsockopt,
894         .sendmsg           = inet_sendmsg,
895         .recvmsg           = sock_common_recvmsg,
896         .mmap              = sock_no_mmap,
897         .sendpage          = inet_sendpage,
898 #ifdef CONFIG_COMPAT
899         .compat_setsockopt = compat_sock_common_setsockopt,
900         .compat_getsockopt = compat_sock_common_getsockopt,
901 #endif
902 };
903 EXPORT_SYMBOL(inet_dgram_ops);
904
905 /*
906  * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
907  * udp_poll
908  */
909 static const struct proto_ops inet_sockraw_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              = datagram_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           = sock_common_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
934 static const struct net_proto_family inet_family_ops = {
935         .family = PF_INET,
936         .create = inet_create,
937         .owner  = THIS_MODULE,
938 };
939
940 /* Upon startup we insert all the elements in inetsw_array[] into
941  * the linked list inetsw.
942  */
943 static struct inet_protosw inetsw_array[] =
944 {
945         {
946                 .type =       SOCK_STREAM,
947                 .protocol =   IPPROTO_TCP,
948                 .prot =       &tcp_prot,
949                 .ops =        &inet_stream_ops,
950                 .no_check =   0,
951                 .flags =      INET_PROTOSW_PERMANENT |
952                               INET_PROTOSW_ICSK,
953         },
954
955         {
956                 .type =       SOCK_DGRAM,
957                 .protocol =   IPPROTO_UDP,
958                 .prot =       &udp_prot,
959                 .ops =        &inet_dgram_ops,
960                 .no_check =   UDP_CSUM_DEFAULT,
961                 .flags =      INET_PROTOSW_PERMANENT,
962        },
963
964
965        {
966                .type =       SOCK_RAW,
967                .protocol =   IPPROTO_IP,        /* wild card */
968                .prot =       &raw_prot,
969                .ops =        &inet_sockraw_ops,
970                .no_check =   UDP_CSUM_DEFAULT,
971                .flags =      INET_PROTOSW_REUSE,
972        }
973 };
974
975 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
976
977 void inet_register_protosw(struct inet_protosw *p)
978 {
979         struct list_head *lh;
980         struct inet_protosw *answer;
981         int protocol = p->protocol;
982         struct list_head *last_perm;
983
984         spin_lock_bh(&inetsw_lock);
985
986         if (p->type >= SOCK_MAX)
987                 goto out_illegal;
988
989         /* If we are trying to override a permanent protocol, bail. */
990         answer = NULL;
991         last_perm = &inetsw[p->type];
992         list_for_each(lh, &inetsw[p->type]) {
993                 answer = list_entry(lh, struct inet_protosw, list);
994
995                 /* Check only the non-wild match. */
996                 if (INET_PROTOSW_PERMANENT & answer->flags) {
997                         if (protocol == answer->protocol)
998                                 break;
999                         last_perm = lh;
1000                 }
1001
1002                 answer = NULL;
1003         }
1004         if (answer)
1005                 goto out_permanent;
1006
1007         /* Add the new entry after the last permanent entry if any, so that
1008          * the new entry does not override a permanent entry when matched with
1009          * a wild-card protocol. But it is allowed to override any existing
1010          * non-permanent entry.  This means that when we remove this entry, the
1011          * system automatically returns to the old behavior.
1012          */
1013         list_add_rcu(&p->list, last_perm);
1014 out:
1015         spin_unlock_bh(&inetsw_lock);
1016
1017         return;
1018
1019 out_permanent:
1020         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
1021                protocol);
1022         goto out;
1023
1024 out_illegal:
1025         printk(KERN_ERR
1026                "Ignoring attempt to register invalid socket type %d.\n",
1027                p->type);
1028         goto out;
1029 }
1030 EXPORT_SYMBOL(inet_register_protosw);
1031
1032 void inet_unregister_protosw(struct inet_protosw *p)
1033 {
1034         if (INET_PROTOSW_PERMANENT & p->flags) {
1035                 printk(KERN_ERR
1036                        "Attempt to unregister permanent protocol %d.\n",
1037                        p->protocol);
1038         } else {
1039                 spin_lock_bh(&inetsw_lock);
1040                 list_del_rcu(&p->list);
1041                 spin_unlock_bh(&inetsw_lock);
1042
1043                 synchronize_net();
1044         }
1045 }
1046 EXPORT_SYMBOL(inet_unregister_protosw);
1047
1048 /*
1049  *      Shall we try to damage output packets if routing dev changes?
1050  */
1051
1052 int sysctl_ip_dynaddr __read_mostly;
1053
1054 static int inet_sk_reselect_saddr(struct sock *sk)
1055 {
1056         struct inet_sock *inet = inet_sk(sk);
1057         int err;
1058         struct rtable *rt;
1059         __be32 old_saddr = inet->inet_saddr;
1060         __be32 new_saddr;
1061         __be32 daddr = inet->inet_daddr;
1062
1063         if (inet->opt && inet->opt->srr)
1064                 daddr = inet->opt->faddr;
1065
1066         /* Query new route. */
1067         err = ip_route_connect(&rt, daddr, 0,
1068                                RT_CONN_FLAGS(sk),
1069                                sk->sk_bound_dev_if,
1070                                sk->sk_protocol,
1071                                inet->inet_sport, inet->inet_dport, sk, 0);
1072         if (err)
1073                 return err;
1074
1075         sk_setup_caps(sk, &rt->u.dst);
1076
1077         new_saddr = rt->rt_src;
1078
1079         if (new_saddr == old_saddr)
1080                 return 0;
1081
1082         if (sysctl_ip_dynaddr > 1) {
1083                 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n",
1084                        __func__, &old_saddr, &new_saddr);
1085         }
1086
1087         inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1088
1089         /*
1090          * XXX The only one ugly spot where we need to
1091          * XXX really change the sockets identity after
1092          * XXX it has entered the hashes. -DaveM
1093          *
1094          * Besides that, it does not check for connection
1095          * uniqueness. Wait for troubles.
1096          */
1097         __sk_prot_rehash(sk);
1098         return 0;
1099 }
1100
1101 int inet_sk_rebuild_header(struct sock *sk)
1102 {
1103         struct inet_sock *inet = inet_sk(sk);
1104         struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1105         __be32 daddr;
1106         int err;
1107
1108         /* Route is OK, nothing to do. */
1109         if (rt)
1110                 return 0;
1111
1112         /* Reroute. */
1113         daddr = inet->inet_daddr;
1114         if (inet->opt && inet->opt->srr)
1115                 daddr = inet->opt->faddr;
1116 {
1117         struct flowi fl = {
1118                 .oif = sk->sk_bound_dev_if,
1119                 .mark = sk->sk_mark,
1120                 .nl_u = {
1121                         .ip4_u = {
1122                                 .daddr  = daddr,
1123                                 .saddr  = inet->inet_saddr,
1124                                 .tos    = RT_CONN_FLAGS(sk),
1125                         },
1126                 },
1127                 .proto = sk->sk_protocol,
1128                 .flags = inet_sk_flowi_flags(sk),
1129                 .uli_u = {
1130                         .ports = {
1131                                 .sport = inet->inet_sport,
1132                                 .dport = inet->inet_dport,
1133                         },
1134                 },
1135         };
1136
1137         security_sk_classify_flow(sk, &fl);
1138         err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
1139 }
1140         if (!err)
1141                 sk_setup_caps(sk, &rt->u.dst);
1142         else {
1143                 /* Routing failed... */
1144                 sk->sk_route_caps = 0;
1145                 /*
1146                  * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1147                  * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1148                  */
1149                 if (!sysctl_ip_dynaddr ||
1150                     sk->sk_state != TCP_SYN_SENT ||
1151                     (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1152                     (err = inet_sk_reselect_saddr(sk)) != 0)
1153                         sk->sk_err_soft = -err;
1154         }
1155
1156         return err;
1157 }
1158 EXPORT_SYMBOL(inet_sk_rebuild_header);
1159
1160 static int inet_gso_send_check(struct sk_buff *skb)
1161 {
1162         struct iphdr *iph;
1163         const struct net_protocol *ops;
1164         int proto;
1165         int ihl;
1166         int err = -EINVAL;
1167
1168         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1169                 goto out;
1170
1171         iph = ip_hdr(skb);
1172         ihl = iph->ihl * 4;
1173         if (ihl < sizeof(*iph))
1174                 goto out;
1175
1176         if (unlikely(!pskb_may_pull(skb, ihl)))
1177                 goto out;
1178
1179         __skb_pull(skb, ihl);
1180         skb_reset_transport_header(skb);
1181         iph = ip_hdr(skb);
1182         proto = iph->protocol & (MAX_INET_PROTOS - 1);
1183         err = -EPROTONOSUPPORT;
1184
1185         rcu_read_lock();
1186         ops = rcu_dereference(inet_protos[proto]);
1187         if (likely(ops && ops->gso_send_check))
1188                 err = ops->gso_send_check(skb);
1189         rcu_read_unlock();
1190
1191 out:
1192         return err;
1193 }
1194
1195 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
1196 {
1197         struct sk_buff *segs = ERR_PTR(-EINVAL);
1198         struct iphdr *iph;
1199         const struct net_protocol *ops;
1200         int proto;
1201         int ihl;
1202         int id;
1203         unsigned int offset = 0;
1204
1205         if (!(features & NETIF_F_V4_CSUM))
1206                 features &= ~NETIF_F_SG;
1207
1208         if (unlikely(skb_shinfo(skb)->gso_type &
1209                      ~(SKB_GSO_TCPV4 |
1210                        SKB_GSO_UDP |
1211                        SKB_GSO_DODGY |
1212                        SKB_GSO_TCP_ECN |
1213                        0)))
1214                 goto out;
1215
1216         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1217                 goto out;
1218
1219         iph = ip_hdr(skb);
1220         ihl = iph->ihl * 4;
1221         if (ihl < sizeof(*iph))
1222                 goto out;
1223
1224         if (unlikely(!pskb_may_pull(skb, ihl)))
1225                 goto out;
1226
1227         __skb_pull(skb, ihl);
1228         skb_reset_transport_header(skb);
1229         iph = ip_hdr(skb);
1230         id = ntohs(iph->id);
1231         proto = iph->protocol & (MAX_INET_PROTOS - 1);
1232         segs = ERR_PTR(-EPROTONOSUPPORT);
1233
1234         rcu_read_lock();
1235         ops = rcu_dereference(inet_protos[proto]);
1236         if (likely(ops && ops->gso_segment))
1237                 segs = ops->gso_segment(skb, features);
1238         rcu_read_unlock();
1239
1240         if (!segs || IS_ERR(segs))
1241                 goto out;
1242
1243         skb = segs;
1244         do {
1245                 iph = ip_hdr(skb);
1246                 if (proto == IPPROTO_UDP) {
1247                         iph->id = htons(id);
1248                         iph->frag_off = htons(offset >> 3);
1249                         if (skb->next != NULL)
1250                                 iph->frag_off |= htons(IP_MF);
1251                         offset += (skb->len - skb->mac_len - iph->ihl * 4);
1252                 } else
1253                         iph->id = htons(id++);
1254                 iph->tot_len = htons(skb->len - skb->mac_len);
1255                 iph->check = 0;
1256                 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
1257         } while ((skb = skb->next));
1258
1259 out:
1260         return segs;
1261 }
1262
1263 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1264                                          struct sk_buff *skb)
1265 {
1266         const struct net_protocol *ops;
1267         struct sk_buff **pp = NULL;
1268         struct sk_buff *p;
1269         struct iphdr *iph;
1270         unsigned int hlen;
1271         unsigned int off;
1272         unsigned int id;
1273         int flush = 1;
1274         int proto;
1275
1276         off = skb_gro_offset(skb);
1277         hlen = off + sizeof(*iph);
1278         iph = skb_gro_header_fast(skb, off);
1279         if (skb_gro_header_hard(skb, hlen)) {
1280                 iph = skb_gro_header_slow(skb, hlen, off);
1281                 if (unlikely(!iph))
1282                         goto out;
1283         }
1284
1285         proto = iph->protocol & (MAX_INET_PROTOS - 1);
1286
1287         rcu_read_lock();
1288         ops = rcu_dereference(inet_protos[proto]);
1289         if (!ops || !ops->gro_receive)
1290                 goto out_unlock;
1291
1292         if (*(u8 *)iph != 0x45)
1293                 goto out_unlock;
1294
1295         if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1296                 goto out_unlock;
1297
1298         id = ntohl(*(u32 *)&iph->id);
1299         flush = (u16)((ntohl(*(u32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
1300         id >>= 16;
1301
1302         for (p = *head; p; p = p->next) {
1303                 struct iphdr *iph2;
1304
1305                 if (!NAPI_GRO_CB(p)->same_flow)
1306                         continue;
1307
1308                 iph2 = ip_hdr(p);
1309
1310                 if ((iph->protocol ^ iph2->protocol) |
1311                     (iph->tos ^ iph2->tos) |
1312                     (iph->saddr ^ iph2->saddr) |
1313                     (iph->daddr ^ iph2->daddr)) {
1314                         NAPI_GRO_CB(p)->same_flow = 0;
1315                         continue;
1316                 }
1317
1318                 /* All fields must match except length and checksum. */
1319                 NAPI_GRO_CB(p)->flush |=
1320                         (iph->ttl ^ iph2->ttl) |
1321                         ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1322
1323                 NAPI_GRO_CB(p)->flush |= flush;
1324         }
1325
1326         NAPI_GRO_CB(skb)->flush |= flush;
1327         skb_gro_pull(skb, sizeof(*iph));
1328         skb_set_transport_header(skb, skb_gro_offset(skb));
1329
1330         pp = ops->gro_receive(head, skb);
1331
1332 out_unlock:
1333         rcu_read_unlock();
1334
1335 out:
1336         NAPI_GRO_CB(skb)->flush |= flush;
1337
1338         return pp;
1339 }
1340
1341 static int inet_gro_complete(struct sk_buff *skb)
1342 {
1343         const struct net_protocol *ops;
1344         struct iphdr *iph = ip_hdr(skb);
1345         int proto = iph->protocol & (MAX_INET_PROTOS - 1);
1346         int err = -ENOSYS;
1347         __be16 newlen = htons(skb->len - skb_network_offset(skb));
1348
1349         csum_replace2(&iph->check, iph->tot_len, newlen);
1350         iph->tot_len = newlen;
1351
1352         rcu_read_lock();
1353         ops = rcu_dereference(inet_protos[proto]);
1354         if (WARN_ON(!ops || !ops->gro_complete))
1355                 goto out_unlock;
1356
1357         err = ops->gro_complete(skb);
1358
1359 out_unlock:
1360         rcu_read_unlock();
1361
1362         return err;
1363 }
1364
1365 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1366                          unsigned short type, unsigned char protocol,
1367                          struct net *net)
1368 {
1369         struct socket *sock;
1370         int rc = sock_create_kern(family, type, protocol, &sock);
1371
1372         if (rc == 0) {
1373                 *sk = sock->sk;
1374                 (*sk)->sk_allocation = GFP_ATOMIC;
1375                 /*
1376                  * Unhash it so that IP input processing does not even see it,
1377                  * we do not wish this socket to see incoming packets.
1378                  */
1379                 (*sk)->sk_prot->unhash(*sk);
1380
1381                 sk_change_net(*sk, net);
1382         }
1383         return rc;
1384 }
1385 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1386
1387 unsigned long snmp_fold_field(void *mib[], int offt)
1388 {
1389         unsigned long res = 0;
1390         int i;
1391
1392         for_each_possible_cpu(i) {
1393                 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
1394                 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
1395         }
1396         return res;
1397 }
1398 EXPORT_SYMBOL_GPL(snmp_fold_field);
1399
1400 int snmp_mib_init(void *ptr[2], size_t mibsize)
1401 {
1402         BUG_ON(ptr == NULL);
1403         ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long long));
1404         if (!ptr[0])
1405                 goto err0;
1406         ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long long));
1407         if (!ptr[1])
1408                 goto err1;
1409         return 0;
1410 err1:
1411         free_percpu(ptr[0]);
1412         ptr[0] = NULL;
1413 err0:
1414         return -ENOMEM;
1415 }
1416 EXPORT_SYMBOL_GPL(snmp_mib_init);
1417
1418 void snmp_mib_free(void *ptr[2])
1419 {
1420         BUG_ON(ptr == NULL);
1421         free_percpu(ptr[0]);
1422         free_percpu(ptr[1]);
1423         ptr[0] = ptr[1] = NULL;
1424 }
1425 EXPORT_SYMBOL_GPL(snmp_mib_free);
1426
1427 #ifdef CONFIG_IP_MULTICAST
1428 static const struct net_protocol igmp_protocol = {
1429         .handler =      igmp_rcv,
1430         .netns_ok =     1,
1431 };
1432 #endif
1433
1434 static const struct net_protocol tcp_protocol = {
1435         .handler =      tcp_v4_rcv,
1436         .err_handler =  tcp_v4_err,
1437         .gso_send_check = tcp_v4_gso_send_check,
1438         .gso_segment =  tcp_tso_segment,
1439         .gro_receive =  tcp4_gro_receive,
1440         .gro_complete = tcp4_gro_complete,
1441         .no_policy =    1,
1442         .netns_ok =     1,
1443 };
1444
1445 static const struct net_protocol udp_protocol = {
1446         .handler =      udp_rcv,
1447         .err_handler =  udp_err,
1448         .gso_send_check = udp4_ufo_send_check,
1449         .gso_segment = udp4_ufo_fragment,
1450         .no_policy =    1,
1451         .netns_ok =     1,
1452 };
1453
1454 static const struct net_protocol icmp_protocol = {
1455         .handler =      icmp_rcv,
1456         .no_policy =    1,
1457         .netns_ok =     1,
1458 };
1459
1460 static __net_init int ipv4_mib_init_net(struct net *net)
1461 {
1462         if (snmp_mib_init((void **)net->mib.tcp_statistics,
1463                           sizeof(struct tcp_mib)) < 0)
1464                 goto err_tcp_mib;
1465         if (snmp_mib_init((void **)net->mib.ip_statistics,
1466                           sizeof(struct ipstats_mib)) < 0)
1467                 goto err_ip_mib;
1468         if (snmp_mib_init((void **)net->mib.net_statistics,
1469                           sizeof(struct linux_mib)) < 0)
1470                 goto err_net_mib;
1471         if (snmp_mib_init((void **)net->mib.udp_statistics,
1472                           sizeof(struct udp_mib)) < 0)
1473                 goto err_udp_mib;
1474         if (snmp_mib_init((void **)net->mib.udplite_statistics,
1475                           sizeof(struct udp_mib)) < 0)
1476                 goto err_udplite_mib;
1477         if (snmp_mib_init((void **)net->mib.icmp_statistics,
1478                           sizeof(struct icmp_mib)) < 0)
1479                 goto err_icmp_mib;
1480         if (snmp_mib_init((void **)net->mib.icmpmsg_statistics,
1481                           sizeof(struct icmpmsg_mib)) < 0)
1482                 goto err_icmpmsg_mib;
1483
1484         tcp_mib_init(net);
1485         return 0;
1486
1487 err_icmpmsg_mib:
1488         snmp_mib_free((void **)net->mib.icmp_statistics);
1489 err_icmp_mib:
1490         snmp_mib_free((void **)net->mib.udplite_statistics);
1491 err_udplite_mib:
1492         snmp_mib_free((void **)net->mib.udp_statistics);
1493 err_udp_mib:
1494         snmp_mib_free((void **)net->mib.net_statistics);
1495 err_net_mib:
1496         snmp_mib_free((void **)net->mib.ip_statistics);
1497 err_ip_mib:
1498         snmp_mib_free((void **)net->mib.tcp_statistics);
1499 err_tcp_mib:
1500         return -ENOMEM;
1501 }
1502
1503 static __net_exit void ipv4_mib_exit_net(struct net *net)
1504 {
1505         snmp_mib_free((void **)net->mib.icmpmsg_statistics);
1506         snmp_mib_free((void **)net->mib.icmp_statistics);
1507         snmp_mib_free((void **)net->mib.udplite_statistics);
1508         snmp_mib_free((void **)net->mib.udp_statistics);
1509         snmp_mib_free((void **)net->mib.net_statistics);
1510         snmp_mib_free((void **)net->mib.ip_statistics);
1511         snmp_mib_free((void **)net->mib.tcp_statistics);
1512 }
1513
1514 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1515         .init = ipv4_mib_init_net,
1516         .exit = ipv4_mib_exit_net,
1517 };
1518
1519 static int __init init_ipv4_mibs(void)
1520 {
1521         return register_pernet_subsys(&ipv4_mib_ops);
1522 }
1523
1524 static int ipv4_proc_init(void);
1525
1526 /*
1527  *      IP protocol layer initialiser
1528  */
1529
1530 static struct packet_type ip_packet_type __read_mostly = {
1531         .type = cpu_to_be16(ETH_P_IP),
1532         .func = ip_rcv,
1533         .gso_send_check = inet_gso_send_check,
1534         .gso_segment = inet_gso_segment,
1535         .gro_receive = inet_gro_receive,
1536         .gro_complete = inet_gro_complete,
1537 };
1538
1539 static int __init inet_init(void)
1540 {
1541         struct sk_buff *dummy_skb;
1542         struct inet_protosw *q;
1543         struct list_head *r;
1544         int rc = -EINVAL;
1545
1546         BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
1547
1548         rc = proto_register(&tcp_prot, 1);
1549         if (rc)
1550                 goto out;
1551
1552         rc = proto_register(&udp_prot, 1);
1553         if (rc)
1554                 goto out_unregister_tcp_proto;
1555
1556         rc = proto_register(&raw_prot, 1);
1557         if (rc)
1558                 goto out_unregister_udp_proto;
1559
1560         /*
1561          *      Tell SOCKET that we are alive...
1562          */
1563
1564         (void)sock_register(&inet_family_ops);
1565
1566 #ifdef CONFIG_SYSCTL
1567         ip_static_sysctl_init();
1568 #endif
1569
1570         /*
1571          *      Add all the base protocols.
1572          */
1573
1574         if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1575                 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1576         if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1577                 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1578         if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1579                 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1580 #ifdef CONFIG_IP_MULTICAST
1581         if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1582                 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1583 #endif
1584
1585         /* Register the socket-side information for inet_create. */
1586         for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1587                 INIT_LIST_HEAD(r);
1588
1589         for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1590                 inet_register_protosw(q);
1591
1592         /*
1593          *      Set the ARP module up
1594          */
1595
1596         arp_init();
1597
1598         /*
1599          *      Set the IP module up
1600          */
1601
1602         ip_init();
1603
1604         tcp_v4_init();
1605
1606         /* Setup TCP slab cache for open requests. */
1607         tcp_init();
1608
1609         /* Setup UDP memory threshold */
1610         udp_init();
1611
1612         /* Add UDP-Lite (RFC 3828) */
1613         udplite4_register();
1614
1615         /*
1616          *      Set the ICMP layer up
1617          */
1618
1619         if (icmp_init() < 0)
1620                 panic("Failed to create the ICMP control socket.\n");
1621
1622         /*
1623          *      Initialise the multicast router
1624          */
1625 #if defined(CONFIG_IP_MROUTE)
1626         if (ip_mr_init())
1627                 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n");
1628 #endif
1629         /*
1630          *      Initialise per-cpu ipv4 mibs
1631          */
1632
1633         if (init_ipv4_mibs())
1634                 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n");
1635
1636         ipv4_proc_init();
1637
1638         ipfrag_init();
1639
1640         dev_add_pack(&ip_packet_type);
1641
1642         rc = 0;
1643 out:
1644         return rc;
1645 out_unregister_udp_proto:
1646         proto_unregister(&udp_prot);
1647 out_unregister_tcp_proto:
1648         proto_unregister(&tcp_prot);
1649         goto out;
1650 }
1651
1652 fs_initcall(inet_init);
1653
1654 /* ------------------------------------------------------------------------ */
1655
1656 #ifdef CONFIG_PROC_FS
1657 static int __init ipv4_proc_init(void)
1658 {
1659         int rc = 0;
1660
1661         if (raw_proc_init())
1662                 goto out_raw;
1663         if (tcp4_proc_init())
1664                 goto out_tcp;
1665         if (udp4_proc_init())
1666                 goto out_udp;
1667         if (ip_misc_proc_init())
1668                 goto out_misc;
1669 out:
1670         return rc;
1671 out_misc:
1672         udp4_proc_exit();
1673 out_udp:
1674         tcp4_proc_exit();
1675 out_tcp:
1676         raw_proc_exit();
1677 out_raw:
1678         rc = -ENOMEM;
1679         goto out;
1680 }
1681
1682 #else /* CONFIG_PROC_FS */
1683 static int __init ipv4_proc_init(void)
1684 {
1685         return 0;
1686 }
1687 #endif /* CONFIG_PROC_FS */
1688
1689 MODULE_ALIAS_NETPROTO(PF_INET);
1690