net: pass kern to net_proto_family create function
[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                        int kern)
267 {
268         struct sock *sk;
269         struct inet_protosw *answer;
270         struct inet_sock *inet;
271         struct proto *answer_prot;
272         unsigned char answer_flags;
273         char answer_no_check;
274         int try_loading_module = 0;
275         int err;
276
277         if (unlikely(!inet_ehash_secret))
278                 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
279                         build_ehash_secret();
280
281         sock->state = SS_UNCONNECTED;
282
283         /* Look for the requested type/protocol pair. */
284 lookup_protocol:
285         err = -ESOCKTNOSUPPORT;
286         rcu_read_lock();
287         list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
288
289                 err = 0;
290                 /* Check the non-wild match. */
291                 if (protocol == answer->protocol) {
292                         if (protocol != IPPROTO_IP)
293                                 break;
294                 } else {
295                         /* Check for the two wild cases. */
296                         if (IPPROTO_IP == protocol) {
297                                 protocol = answer->protocol;
298                                 break;
299                         }
300                         if (IPPROTO_IP == answer->protocol)
301                                 break;
302                 }
303                 err = -EPROTONOSUPPORT;
304         }
305
306         if (unlikely(err)) {
307                 if (try_loading_module < 2) {
308                         rcu_read_unlock();
309                         /*
310                          * Be more specific, e.g. net-pf-2-proto-132-type-1
311                          * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
312                          */
313                         if (++try_loading_module == 1)
314                                 request_module("net-pf-%d-proto-%d-type-%d",
315                                                PF_INET, protocol, sock->type);
316                         /*
317                          * Fall back to generic, e.g. net-pf-2-proto-132
318                          * (net-pf-PF_INET-proto-IPPROTO_SCTP)
319                          */
320                         else
321                                 request_module("net-pf-%d-proto-%d",
322                                                PF_INET, protocol);
323                         goto lookup_protocol;
324                 } else
325                         goto out_rcu_unlock;
326         }
327
328         err = -EPERM;
329         if (sock->type == SOCK_RAW && !capable(CAP_NET_RAW))
330                 goto out_rcu_unlock;
331
332         err = -EAFNOSUPPORT;
333         if (!inet_netns_ok(net, protocol))
334                 goto out_rcu_unlock;
335
336         sock->ops = answer->ops;
337         answer_prot = answer->prot;
338         answer_no_check = answer->no_check;
339         answer_flags = answer->flags;
340         rcu_read_unlock();
341
342         WARN_ON(answer_prot->slab == NULL);
343
344         err = -ENOBUFS;
345         sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
346         if (sk == NULL)
347                 goto out;
348
349         err = 0;
350         sk->sk_no_check = answer_no_check;
351         if (INET_PROTOSW_REUSE & answer_flags)
352                 sk->sk_reuse = 1;
353
354         inet = inet_sk(sk);
355         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
356
357         if (SOCK_RAW == sock->type) {
358                 inet->inet_num = protocol;
359                 if (IPPROTO_RAW == protocol)
360                         inet->hdrincl = 1;
361         }
362
363         if (ipv4_config.no_pmtu_disc)
364                 inet->pmtudisc = IP_PMTUDISC_DONT;
365         else
366                 inet->pmtudisc = IP_PMTUDISC_WANT;
367
368         inet->inet_id = 0;
369
370         sock_init_data(sock, sk);
371
372         sk->sk_destruct    = inet_sock_destruct;
373         sk->sk_protocol    = protocol;
374         sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
375
376         inet->uc_ttl    = -1;
377         inet->mc_loop   = 1;
378         inet->mc_ttl    = 1;
379         inet->mc_all    = 1;
380         inet->mc_index  = 0;
381         inet->mc_list   = NULL;
382
383         sk_refcnt_debug_inc(sk);
384
385         if (inet->inet_num) {
386                 /* It assumes that any protocol which allows
387                  * the user to assign a number at socket
388                  * creation time automatically
389                  * shares.
390                  */
391                 inet->inet_sport = htons(inet->inet_num);
392                 /* Add to protocol hash chains. */
393                 sk->sk_prot->hash(sk);
394         }
395
396         if (sk->sk_prot->init) {
397                 err = sk->sk_prot->init(sk);
398                 if (err)
399                         sk_common_release(sk);
400         }
401 out:
402         return err;
403 out_rcu_unlock:
404         rcu_read_unlock();
405         goto out;
406 }
407
408
409 /*
410  *      The peer socket should always be NULL (or else). When we call this
411  *      function we are destroying the object and from then on nobody
412  *      should refer to it.
413  */
414 int inet_release(struct socket *sock)
415 {
416         struct sock *sk = sock->sk;
417
418         if (sk) {
419                 long timeout;
420
421                 /* Applications forget to leave groups before exiting */
422                 ip_mc_drop_socket(sk);
423
424                 /* If linger is set, we don't return until the close
425                  * is complete.  Otherwise we return immediately. The
426                  * actually closing is done the same either way.
427                  *
428                  * If the close is due to the process exiting, we never
429                  * linger..
430                  */
431                 timeout = 0;
432                 if (sock_flag(sk, SOCK_LINGER) &&
433                     !(current->flags & PF_EXITING))
434                         timeout = sk->sk_lingertime;
435                 sock->sk = NULL;
436                 sk->sk_prot->close(sk, timeout);
437         }
438         return 0;
439 }
440 EXPORT_SYMBOL(inet_release);
441
442 /* It is off by default, see below. */
443 int sysctl_ip_nonlocal_bind __read_mostly;
444 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
445
446 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
447 {
448         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
449         struct sock *sk = sock->sk;
450         struct inet_sock *inet = inet_sk(sk);
451         unsigned short snum;
452         int chk_addr_ret;
453         int err;
454
455         /* If the socket has its own bind function then use it. (RAW) */
456         if (sk->sk_prot->bind) {
457                 err = sk->sk_prot->bind(sk, uaddr, addr_len);
458                 goto out;
459         }
460         err = -EINVAL;
461         if (addr_len < sizeof(struct sockaddr_in))
462                 goto out;
463
464         chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
465
466         /* Not specified by any standard per-se, however it breaks too
467          * many applications when removed.  It is unfortunate since
468          * allowing applications to make a non-local bind solves
469          * several problems with systems using dynamic addressing.
470          * (ie. your servers still start up even if your ISDN link
471          *  is temporarily down)
472          */
473         err = -EADDRNOTAVAIL;
474         if (!sysctl_ip_nonlocal_bind &&
475             !(inet->freebind || inet->transparent) &&
476             addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
477             chk_addr_ret != RTN_LOCAL &&
478             chk_addr_ret != RTN_MULTICAST &&
479             chk_addr_ret != RTN_BROADCAST)
480                 goto out;
481
482         snum = ntohs(addr->sin_port);
483         err = -EACCES;
484         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
485                 goto out;
486
487         /*      We keep a pair of addresses. rcv_saddr is the one
488          *      used by hash lookups, and saddr is used for transmit.
489          *
490          *      In the BSD API these are the same except where it
491          *      would be illegal to use them (multicast/broadcast) in
492          *      which case the sending device address is used.
493          */
494         lock_sock(sk);
495
496         /* Check these errors (active socket, double bind). */
497         err = -EINVAL;
498         if (sk->sk_state != TCP_CLOSE || inet->inet_num)
499                 goto out_release_sock;
500
501         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
502         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
503                 inet->inet_saddr = 0;  /* Use device */
504
505         /* Make sure we are allowed to bind here. */
506         if (sk->sk_prot->get_port(sk, snum)) {
507                 inet->inet_saddr = inet->inet_rcv_saddr = 0;
508                 err = -EADDRINUSE;
509                 goto out_release_sock;
510         }
511
512         if (inet->inet_rcv_saddr)
513                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
514         if (snum)
515                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
516         inet->inet_sport = htons(inet->inet_num);
517         inet->inet_daddr = 0;
518         inet->inet_dport = 0;
519         sk_dst_reset(sk);
520         err = 0;
521 out_release_sock:
522         release_sock(sk);
523 out:
524         return err;
525 }
526 EXPORT_SYMBOL(inet_bind);
527
528 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
529                        int addr_len, int flags)
530 {
531         struct sock *sk = sock->sk;
532
533         if (uaddr->sa_family == AF_UNSPEC)
534                 return sk->sk_prot->disconnect(sk, flags);
535
536         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
537                 return -EAGAIN;
538         return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
539 }
540 EXPORT_SYMBOL(inet_dgram_connect);
541
542 static long inet_wait_for_connect(struct sock *sk, long timeo)
543 {
544         DEFINE_WAIT(wait);
545
546         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
547
548         /* Basic assumption: if someone sets sk->sk_err, he _must_
549          * change state of the socket from TCP_SYN_*.
550          * Connect() does not allow to get error notifications
551          * without closing the socket.
552          */
553         while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
554                 release_sock(sk);
555                 timeo = schedule_timeout(timeo);
556                 lock_sock(sk);
557                 if (signal_pending(current) || !timeo)
558                         break;
559                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
560         }
561         finish_wait(sk->sk_sleep, &wait);
562         return timeo;
563 }
564
565 /*
566  *      Connect to a remote host. There is regrettably still a little
567  *      TCP 'magic' in here.
568  */
569 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
570                         int addr_len, int flags)
571 {
572         struct sock *sk = sock->sk;
573         int err;
574         long timeo;
575
576         lock_sock(sk);
577
578         if (uaddr->sa_family == AF_UNSPEC) {
579                 err = sk->sk_prot->disconnect(sk, flags);
580                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
581                 goto out;
582         }
583
584         switch (sock->state) {
585         default:
586                 err = -EINVAL;
587                 goto out;
588         case SS_CONNECTED:
589                 err = -EISCONN;
590                 goto out;
591         case SS_CONNECTING:
592                 err = -EALREADY;
593                 /* Fall out of switch with err, set for this state */
594                 break;
595         case SS_UNCONNECTED:
596                 err = -EISCONN;
597                 if (sk->sk_state != TCP_CLOSE)
598                         goto out;
599
600                 err = sk->sk_prot->connect(sk, uaddr, addr_len);
601                 if (err < 0)
602                         goto out;
603
604                 sock->state = SS_CONNECTING;
605
606                 /* Just entered SS_CONNECTING state; the only
607                  * difference is that return value in non-blocking
608                  * case is EINPROGRESS, rather than EALREADY.
609                  */
610                 err = -EINPROGRESS;
611                 break;
612         }
613
614         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
615
616         if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
617                 /* Error code is set above */
618                 if (!timeo || !inet_wait_for_connect(sk, timeo))
619                         goto out;
620
621                 err = sock_intr_errno(timeo);
622                 if (signal_pending(current))
623                         goto out;
624         }
625
626         /* Connection was closed by RST, timeout, ICMP error
627          * or another process disconnected us.
628          */
629         if (sk->sk_state == TCP_CLOSE)
630                 goto sock_error;
631
632         /* sk->sk_err may be not zero now, if RECVERR was ordered by user
633          * and error was received after socket entered established state.
634          * Hence, it is handled normally after connect() return successfully.
635          */
636
637         sock->state = SS_CONNECTED;
638         err = 0;
639 out:
640         release_sock(sk);
641         return err;
642
643 sock_error:
644         err = sock_error(sk) ? : -ECONNABORTED;
645         sock->state = SS_UNCONNECTED;
646         if (sk->sk_prot->disconnect(sk, flags))
647                 sock->state = SS_DISCONNECTING;
648         goto out;
649 }
650 EXPORT_SYMBOL(inet_stream_connect);
651
652 /*
653  *      Accept a pending connection. The TCP layer now gives BSD semantics.
654  */
655
656 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
657 {
658         struct sock *sk1 = sock->sk;
659         int err = -EINVAL;
660         struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
661
662         if (!sk2)
663                 goto do_err;
664
665         lock_sock(sk2);
666
667         WARN_ON(!((1 << sk2->sk_state) &
668                   (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
669
670         sock_graft(sk2, newsock);
671
672         newsock->state = SS_CONNECTED;
673         err = 0;
674         release_sock(sk2);
675 do_err:
676         return err;
677 }
678 EXPORT_SYMBOL(inet_accept);
679
680
681 /*
682  *      This does both peername and sockname.
683  */
684 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
685                         int *uaddr_len, int peer)
686 {
687         struct sock *sk         = sock->sk;
688         struct inet_sock *inet  = inet_sk(sk);
689         DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
690
691         sin->sin_family = AF_INET;
692         if (peer) {
693                 if (!inet->inet_dport ||
694                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
695                      peer == 1))
696                         return -ENOTCONN;
697                 sin->sin_port = inet->inet_dport;
698                 sin->sin_addr.s_addr = inet->inet_daddr;
699         } else {
700                 __be32 addr = inet->inet_rcv_saddr;
701                 if (!addr)
702                         addr = inet->inet_saddr;
703                 sin->sin_port = inet->inet_sport;
704                 sin->sin_addr.s_addr = addr;
705         }
706         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
707         *uaddr_len = sizeof(*sin);
708         return 0;
709 }
710 EXPORT_SYMBOL(inet_getname);
711
712 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
713                  size_t size)
714 {
715         struct sock *sk = sock->sk;
716
717         /* We may need to bind the socket. */
718         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
719                 return -EAGAIN;
720
721         return sk->sk_prot->sendmsg(iocb, sk, msg, size);
722 }
723 EXPORT_SYMBOL(inet_sendmsg);
724
725
726 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
727                              size_t size, int flags)
728 {
729         struct sock *sk = sock->sk;
730
731         /* We may need to bind the socket. */
732         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
733                 return -EAGAIN;
734
735         if (sk->sk_prot->sendpage)
736                 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
737         return sock_no_sendpage(sock, page, offset, size, flags);
738 }
739
740
741 int inet_shutdown(struct socket *sock, int how)
742 {
743         struct sock *sk = sock->sk;
744         int err = 0;
745
746         /* This should really check to make sure
747          * the socket is a TCP socket. (WHY AC...)
748          */
749         how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
750                        1->2 bit 2 snds.
751                        2->3 */
752         if ((how & ~SHUTDOWN_MASK) || !how)     /* MAXINT->0 */
753                 return -EINVAL;
754
755         lock_sock(sk);
756         if (sock->state == SS_CONNECTING) {
757                 if ((1 << sk->sk_state) &
758                     (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
759                         sock->state = SS_DISCONNECTING;
760                 else
761                         sock->state = SS_CONNECTED;
762         }
763
764         switch (sk->sk_state) {
765         case TCP_CLOSE:
766                 err = -ENOTCONN;
767                 /* Hack to wake up other listeners, who can poll for
768                    POLLHUP, even on eg. unconnected UDP sockets -- RR */
769         default:
770                 sk->sk_shutdown |= how;
771                 if (sk->sk_prot->shutdown)
772                         sk->sk_prot->shutdown(sk, how);
773                 break;
774
775         /* Remaining two branches are temporary solution for missing
776          * close() in multithreaded environment. It is _not_ a good idea,
777          * but we have no choice until close() is repaired at VFS level.
778          */
779         case TCP_LISTEN:
780                 if (!(how & RCV_SHUTDOWN))
781                         break;
782                 /* Fall through */
783         case TCP_SYN_SENT:
784                 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
785                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
786                 break;
787         }
788
789         /* Wake up anyone sleeping in poll. */
790         sk->sk_state_change(sk);
791         release_sock(sk);
792         return err;
793 }
794 EXPORT_SYMBOL(inet_shutdown);
795
796 /*
797  *      ioctl() calls you can issue on an INET socket. Most of these are
798  *      device configuration and stuff and very rarely used. Some ioctls
799  *      pass on to the socket itself.
800  *
801  *      NOTE: I like the idea of a module for the config stuff. ie ifconfig
802  *      loads the devconfigure module does its configuring and unloads it.
803  *      There's a good 20K of config code hanging around the kernel.
804  */
805
806 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
807 {
808         struct sock *sk = sock->sk;
809         int err = 0;
810         struct net *net = sock_net(sk);
811
812         switch (cmd) {
813         case SIOCGSTAMP:
814                 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
815                 break;
816         case SIOCGSTAMPNS:
817                 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
818                 break;
819         case SIOCADDRT:
820         case SIOCDELRT:
821         case SIOCRTMSG:
822                 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
823                 break;
824         case SIOCDARP:
825         case SIOCGARP:
826         case SIOCSARP:
827                 err = arp_ioctl(net, cmd, (void __user *)arg);
828                 break;
829         case SIOCGIFADDR:
830         case SIOCSIFADDR:
831         case SIOCGIFBRDADDR:
832         case SIOCSIFBRDADDR:
833         case SIOCGIFNETMASK:
834         case SIOCSIFNETMASK:
835         case SIOCGIFDSTADDR:
836         case SIOCSIFDSTADDR:
837         case SIOCSIFPFLAGS:
838         case SIOCGIFPFLAGS:
839         case SIOCSIFFLAGS:
840                 err = devinet_ioctl(net, cmd, (void __user *)arg);
841                 break;
842         default:
843                 if (sk->sk_prot->ioctl)
844                         err = sk->sk_prot->ioctl(sk, cmd, arg);
845                 else
846                         err = -ENOIOCTLCMD;
847                 break;
848         }
849         return err;
850 }
851 EXPORT_SYMBOL(inet_ioctl);
852
853 const struct proto_ops inet_stream_ops = {
854         .family            = PF_INET,
855         .owner             = THIS_MODULE,
856         .release           = inet_release,
857         .bind              = inet_bind,
858         .connect           = inet_stream_connect,
859         .socketpair        = sock_no_socketpair,
860         .accept            = inet_accept,
861         .getname           = inet_getname,
862         .poll              = tcp_poll,
863         .ioctl             = inet_ioctl,
864         .listen            = inet_listen,
865         .shutdown          = inet_shutdown,
866         .setsockopt        = sock_common_setsockopt,
867         .getsockopt        = sock_common_getsockopt,
868         .sendmsg           = tcp_sendmsg,
869         .recvmsg           = sock_common_recvmsg,
870         .mmap              = sock_no_mmap,
871         .sendpage          = tcp_sendpage,
872         .splice_read       = tcp_splice_read,
873 #ifdef CONFIG_COMPAT
874         .compat_setsockopt = compat_sock_common_setsockopt,
875         .compat_getsockopt = compat_sock_common_getsockopt,
876 #endif
877 };
878 EXPORT_SYMBOL(inet_stream_ops);
879
880 const struct proto_ops inet_dgram_ops = {
881         .family            = PF_INET,
882         .owner             = THIS_MODULE,
883         .release           = inet_release,
884         .bind              = inet_bind,
885         .connect           = inet_dgram_connect,
886         .socketpair        = sock_no_socketpair,
887         .accept            = sock_no_accept,
888         .getname           = inet_getname,
889         .poll              = udp_poll,
890         .ioctl             = inet_ioctl,
891         .listen            = sock_no_listen,
892         .shutdown          = inet_shutdown,
893         .setsockopt        = sock_common_setsockopt,
894         .getsockopt        = sock_common_getsockopt,
895         .sendmsg           = inet_sendmsg,
896         .recvmsg           = sock_common_recvmsg,
897         .mmap              = sock_no_mmap,
898         .sendpage          = inet_sendpage,
899 #ifdef CONFIG_COMPAT
900         .compat_setsockopt = compat_sock_common_setsockopt,
901         .compat_getsockopt = compat_sock_common_getsockopt,
902 #endif
903 };
904 EXPORT_SYMBOL(inet_dgram_ops);
905
906 /*
907  * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
908  * udp_poll
909  */
910 static const struct proto_ops inet_sockraw_ops = {
911         .family            = PF_INET,
912         .owner             = THIS_MODULE,
913         .release           = inet_release,
914         .bind              = inet_bind,
915         .connect           = inet_dgram_connect,
916         .socketpair        = sock_no_socketpair,
917         .accept            = sock_no_accept,
918         .getname           = inet_getname,
919         .poll              = datagram_poll,
920         .ioctl             = inet_ioctl,
921         .listen            = sock_no_listen,
922         .shutdown          = inet_shutdown,
923         .setsockopt        = sock_common_setsockopt,
924         .getsockopt        = sock_common_getsockopt,
925         .sendmsg           = inet_sendmsg,
926         .recvmsg           = sock_common_recvmsg,
927         .mmap              = sock_no_mmap,
928         .sendpage          = inet_sendpage,
929 #ifdef CONFIG_COMPAT
930         .compat_setsockopt = compat_sock_common_setsockopt,
931         .compat_getsockopt = compat_sock_common_getsockopt,
932 #endif
933 };
934
935 static const struct net_proto_family inet_family_ops = {
936         .family = PF_INET,
937         .create = inet_create,
938         .owner  = THIS_MODULE,
939 };
940
941 /* Upon startup we insert all the elements in inetsw_array[] into
942  * the linked list inetsw.
943  */
944 static struct inet_protosw inetsw_array[] =
945 {
946         {
947                 .type =       SOCK_STREAM,
948                 .protocol =   IPPROTO_TCP,
949                 .prot =       &tcp_prot,
950                 .ops =        &inet_stream_ops,
951                 .no_check =   0,
952                 .flags =      INET_PROTOSW_PERMANENT |
953                               INET_PROTOSW_ICSK,
954         },
955
956         {
957                 .type =       SOCK_DGRAM,
958                 .protocol =   IPPROTO_UDP,
959                 .prot =       &udp_prot,
960                 .ops =        &inet_dgram_ops,
961                 .no_check =   UDP_CSUM_DEFAULT,
962                 .flags =      INET_PROTOSW_PERMANENT,
963        },
964
965
966        {
967                .type =       SOCK_RAW,
968                .protocol =   IPPROTO_IP,        /* wild card */
969                .prot =       &raw_prot,
970                .ops =        &inet_sockraw_ops,
971                .no_check =   UDP_CSUM_DEFAULT,
972                .flags =      INET_PROTOSW_REUSE,
973        }
974 };
975
976 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
977
978 void inet_register_protosw(struct inet_protosw *p)
979 {
980         struct list_head *lh;
981         struct inet_protosw *answer;
982         int protocol = p->protocol;
983         struct list_head *last_perm;
984
985         spin_lock_bh(&inetsw_lock);
986
987         if (p->type >= SOCK_MAX)
988                 goto out_illegal;
989
990         /* If we are trying to override a permanent protocol, bail. */
991         answer = NULL;
992         last_perm = &inetsw[p->type];
993         list_for_each(lh, &inetsw[p->type]) {
994                 answer = list_entry(lh, struct inet_protosw, list);
995
996                 /* Check only the non-wild match. */
997                 if (INET_PROTOSW_PERMANENT & answer->flags) {
998                         if (protocol == answer->protocol)
999                                 break;
1000                         last_perm = lh;
1001                 }
1002
1003                 answer = NULL;
1004         }
1005         if (answer)
1006                 goto out_permanent;
1007
1008         /* Add the new entry after the last permanent entry if any, so that
1009          * the new entry does not override a permanent entry when matched with
1010          * a wild-card protocol. But it is allowed to override any existing
1011          * non-permanent entry.  This means that when we remove this entry, the
1012          * system automatically returns to the old behavior.
1013          */
1014         list_add_rcu(&p->list, last_perm);
1015 out:
1016         spin_unlock_bh(&inetsw_lock);
1017
1018         return;
1019
1020 out_permanent:
1021         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
1022                protocol);
1023         goto out;
1024
1025 out_illegal:
1026         printk(KERN_ERR
1027                "Ignoring attempt to register invalid socket type %d.\n",
1028                p->type);
1029         goto out;
1030 }
1031 EXPORT_SYMBOL(inet_register_protosw);
1032
1033 void inet_unregister_protosw(struct inet_protosw *p)
1034 {
1035         if (INET_PROTOSW_PERMANENT & p->flags) {
1036                 printk(KERN_ERR
1037                        "Attempt to unregister permanent protocol %d.\n",
1038                        p->protocol);
1039         } else {
1040                 spin_lock_bh(&inetsw_lock);
1041                 list_del_rcu(&p->list);
1042                 spin_unlock_bh(&inetsw_lock);
1043
1044                 synchronize_net();
1045         }
1046 }
1047 EXPORT_SYMBOL(inet_unregister_protosw);
1048
1049 /*
1050  *      Shall we try to damage output packets if routing dev changes?
1051  */
1052
1053 int sysctl_ip_dynaddr __read_mostly;
1054
1055 static int inet_sk_reselect_saddr(struct sock *sk)
1056 {
1057         struct inet_sock *inet = inet_sk(sk);
1058         int err;
1059         struct rtable *rt;
1060         __be32 old_saddr = inet->inet_saddr;
1061         __be32 new_saddr;
1062         __be32 daddr = inet->inet_daddr;
1063
1064         if (inet->opt && inet->opt->srr)
1065                 daddr = inet->opt->faddr;
1066
1067         /* Query new route. */
1068         err = ip_route_connect(&rt, daddr, 0,
1069                                RT_CONN_FLAGS(sk),
1070                                sk->sk_bound_dev_if,
1071                                sk->sk_protocol,
1072                                inet->inet_sport, inet->inet_dport, sk, 0);
1073         if (err)
1074                 return err;
1075
1076         sk_setup_caps(sk, &rt->u.dst);
1077
1078         new_saddr = rt->rt_src;
1079
1080         if (new_saddr == old_saddr)
1081                 return 0;
1082
1083         if (sysctl_ip_dynaddr > 1) {
1084                 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n",
1085                        __func__, &old_saddr, &new_saddr);
1086         }
1087
1088         inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1089
1090         /*
1091          * XXX The only one ugly spot where we need to
1092          * XXX really change the sockets identity after
1093          * XXX it has entered the hashes. -DaveM
1094          *
1095          * Besides that, it does not check for connection
1096          * uniqueness. Wait for troubles.
1097          */
1098         __sk_prot_rehash(sk);
1099         return 0;
1100 }
1101
1102 int inet_sk_rebuild_header(struct sock *sk)
1103 {
1104         struct inet_sock *inet = inet_sk(sk);
1105         struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1106         __be32 daddr;
1107         int err;
1108
1109         /* Route is OK, nothing to do. */
1110         if (rt)
1111                 return 0;
1112
1113         /* Reroute. */
1114         daddr = inet->inet_daddr;
1115         if (inet->opt && inet->opt->srr)
1116                 daddr = inet->opt->faddr;
1117 {
1118         struct flowi fl = {
1119                 .oif = sk->sk_bound_dev_if,
1120                 .mark = sk->sk_mark,
1121                 .nl_u = {
1122                         .ip4_u = {
1123                                 .daddr  = daddr,
1124                                 .saddr  = inet->inet_saddr,
1125                                 .tos    = RT_CONN_FLAGS(sk),
1126                         },
1127                 },
1128                 .proto = sk->sk_protocol,
1129                 .flags = inet_sk_flowi_flags(sk),
1130                 .uli_u = {
1131                         .ports = {
1132                                 .sport = inet->inet_sport,
1133                                 .dport = inet->inet_dport,
1134                         },
1135                 },
1136         };
1137
1138         security_sk_classify_flow(sk, &fl);
1139         err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
1140 }
1141         if (!err)
1142                 sk_setup_caps(sk, &rt->u.dst);
1143         else {
1144                 /* Routing failed... */
1145                 sk->sk_route_caps = 0;
1146                 /*
1147                  * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1148                  * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1149                  */
1150                 if (!sysctl_ip_dynaddr ||
1151                     sk->sk_state != TCP_SYN_SENT ||
1152                     (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1153                     (err = inet_sk_reselect_saddr(sk)) != 0)
1154                         sk->sk_err_soft = -err;
1155         }
1156
1157         return err;
1158 }
1159 EXPORT_SYMBOL(inet_sk_rebuild_header);
1160
1161 static int inet_gso_send_check(struct sk_buff *skb)
1162 {
1163         struct iphdr *iph;
1164         const struct net_protocol *ops;
1165         int proto;
1166         int ihl;
1167         int err = -EINVAL;
1168
1169         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1170                 goto out;
1171
1172         iph = ip_hdr(skb);
1173         ihl = iph->ihl * 4;
1174         if (ihl < sizeof(*iph))
1175                 goto out;
1176
1177         if (unlikely(!pskb_may_pull(skb, ihl)))
1178                 goto out;
1179
1180         __skb_pull(skb, ihl);
1181         skb_reset_transport_header(skb);
1182         iph = ip_hdr(skb);
1183         proto = iph->protocol & (MAX_INET_PROTOS - 1);
1184         err = -EPROTONOSUPPORT;
1185
1186         rcu_read_lock();
1187         ops = rcu_dereference(inet_protos[proto]);
1188         if (likely(ops && ops->gso_send_check))
1189                 err = ops->gso_send_check(skb);
1190         rcu_read_unlock();
1191
1192 out:
1193         return err;
1194 }
1195
1196 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
1197 {
1198         struct sk_buff *segs = ERR_PTR(-EINVAL);
1199         struct iphdr *iph;
1200         const struct net_protocol *ops;
1201         int proto;
1202         int ihl;
1203         int id;
1204         unsigned int offset = 0;
1205
1206         if (!(features & NETIF_F_V4_CSUM))
1207                 features &= ~NETIF_F_SG;
1208
1209         if (unlikely(skb_shinfo(skb)->gso_type &
1210                      ~(SKB_GSO_TCPV4 |
1211                        SKB_GSO_UDP |
1212                        SKB_GSO_DODGY |
1213                        SKB_GSO_TCP_ECN |
1214                        0)))
1215                 goto out;
1216
1217         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1218                 goto out;
1219
1220         iph = ip_hdr(skb);
1221         ihl = iph->ihl * 4;
1222         if (ihl < sizeof(*iph))
1223                 goto out;
1224
1225         if (unlikely(!pskb_may_pull(skb, ihl)))
1226                 goto out;
1227
1228         __skb_pull(skb, ihl);
1229         skb_reset_transport_header(skb);
1230         iph = ip_hdr(skb);
1231         id = ntohs(iph->id);
1232         proto = iph->protocol & (MAX_INET_PROTOS - 1);
1233         segs = ERR_PTR(-EPROTONOSUPPORT);
1234
1235         rcu_read_lock();
1236         ops = rcu_dereference(inet_protos[proto]);
1237         if (likely(ops && ops->gso_segment))
1238                 segs = ops->gso_segment(skb, features);
1239         rcu_read_unlock();
1240
1241         if (!segs || IS_ERR(segs))
1242                 goto out;
1243
1244         skb = segs;
1245         do {
1246                 iph = ip_hdr(skb);
1247                 if (proto == IPPROTO_UDP) {
1248                         iph->id = htons(id);
1249                         iph->frag_off = htons(offset >> 3);
1250                         if (skb->next != NULL)
1251                                 iph->frag_off |= htons(IP_MF);
1252                         offset += (skb->len - skb->mac_len - iph->ihl * 4);
1253                 } else
1254                         iph->id = htons(id++);
1255                 iph->tot_len = htons(skb->len - skb->mac_len);
1256                 iph->check = 0;
1257                 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
1258         } while ((skb = skb->next));
1259
1260 out:
1261         return segs;
1262 }
1263
1264 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
1265                                          struct sk_buff *skb)
1266 {
1267         const struct net_protocol *ops;
1268         struct sk_buff **pp = NULL;
1269         struct sk_buff *p;
1270         struct iphdr *iph;
1271         unsigned int hlen;
1272         unsigned int off;
1273         unsigned int id;
1274         int flush = 1;
1275         int proto;
1276
1277         off = skb_gro_offset(skb);
1278         hlen = off + sizeof(*iph);
1279         iph = skb_gro_header_fast(skb, off);
1280         if (skb_gro_header_hard(skb, hlen)) {
1281                 iph = skb_gro_header_slow(skb, hlen, off);
1282                 if (unlikely(!iph))
1283                         goto out;
1284         }
1285
1286         proto = iph->protocol & (MAX_INET_PROTOS - 1);
1287
1288         rcu_read_lock();
1289         ops = rcu_dereference(inet_protos[proto]);
1290         if (!ops || !ops->gro_receive)
1291                 goto out_unlock;
1292
1293         if (*(u8 *)iph != 0x45)
1294                 goto out_unlock;
1295
1296         if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1297                 goto out_unlock;
1298
1299         id = ntohl(*(u32 *)&iph->id);
1300         flush = (u16)((ntohl(*(u32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
1301         id >>= 16;
1302
1303         for (p = *head; p; p = p->next) {
1304                 struct iphdr *iph2;
1305
1306                 if (!NAPI_GRO_CB(p)->same_flow)
1307                         continue;
1308
1309                 iph2 = ip_hdr(p);
1310
1311                 if ((iph->protocol ^ iph2->protocol) |
1312                     (iph->tos ^ iph2->tos) |
1313                     (iph->saddr ^ iph2->saddr) |
1314                     (iph->daddr ^ iph2->daddr)) {
1315                         NAPI_GRO_CB(p)->same_flow = 0;
1316                         continue;
1317                 }
1318
1319                 /* All fields must match except length and checksum. */
1320                 NAPI_GRO_CB(p)->flush |=
1321                         (iph->ttl ^ iph2->ttl) |
1322                         ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
1323
1324                 NAPI_GRO_CB(p)->flush |= flush;
1325         }
1326
1327         NAPI_GRO_CB(skb)->flush |= flush;
1328         skb_gro_pull(skb, sizeof(*iph));
1329         skb_set_transport_header(skb, skb_gro_offset(skb));
1330
1331         pp = ops->gro_receive(head, skb);
1332
1333 out_unlock:
1334         rcu_read_unlock();
1335
1336 out:
1337         NAPI_GRO_CB(skb)->flush |= flush;
1338
1339         return pp;
1340 }
1341
1342 static int inet_gro_complete(struct sk_buff *skb)
1343 {
1344         const struct net_protocol *ops;
1345         struct iphdr *iph = ip_hdr(skb);
1346         int proto = iph->protocol & (MAX_INET_PROTOS - 1);
1347         int err = -ENOSYS;
1348         __be16 newlen = htons(skb->len - skb_network_offset(skb));
1349
1350         csum_replace2(&iph->check, iph->tot_len, newlen);
1351         iph->tot_len = newlen;
1352
1353         rcu_read_lock();
1354         ops = rcu_dereference(inet_protos[proto]);
1355         if (WARN_ON(!ops || !ops->gro_complete))
1356                 goto out_unlock;
1357
1358         err = ops->gro_complete(skb);
1359
1360 out_unlock:
1361         rcu_read_unlock();
1362
1363         return err;
1364 }
1365
1366 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1367                          unsigned short type, unsigned char protocol,
1368                          struct net *net)
1369 {
1370         struct socket *sock;
1371         int rc = sock_create_kern(family, type, protocol, &sock);
1372
1373         if (rc == 0) {
1374                 *sk = sock->sk;
1375                 (*sk)->sk_allocation = GFP_ATOMIC;
1376                 /*
1377                  * Unhash it so that IP input processing does not even see it,
1378                  * we do not wish this socket to see incoming packets.
1379                  */
1380                 (*sk)->sk_prot->unhash(*sk);
1381
1382                 sk_change_net(*sk, net);
1383         }
1384         return rc;
1385 }
1386 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1387
1388 unsigned long snmp_fold_field(void *mib[], int offt)
1389 {
1390         unsigned long res = 0;
1391         int i;
1392
1393         for_each_possible_cpu(i) {
1394                 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
1395                 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
1396         }
1397         return res;
1398 }
1399 EXPORT_SYMBOL_GPL(snmp_fold_field);
1400
1401 int snmp_mib_init(void *ptr[2], size_t mibsize)
1402 {
1403         BUG_ON(ptr == NULL);
1404         ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long long));
1405         if (!ptr[0])
1406                 goto err0;
1407         ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long long));
1408         if (!ptr[1])
1409                 goto err1;
1410         return 0;
1411 err1:
1412         free_percpu(ptr[0]);
1413         ptr[0] = NULL;
1414 err0:
1415         return -ENOMEM;
1416 }
1417 EXPORT_SYMBOL_GPL(snmp_mib_init);
1418
1419 void snmp_mib_free(void *ptr[2])
1420 {
1421         BUG_ON(ptr == NULL);
1422         free_percpu(ptr[0]);
1423         free_percpu(ptr[1]);
1424         ptr[0] = ptr[1] = NULL;
1425 }
1426 EXPORT_SYMBOL_GPL(snmp_mib_free);
1427
1428 #ifdef CONFIG_IP_MULTICAST
1429 static const struct net_protocol igmp_protocol = {
1430         .handler =      igmp_rcv,
1431         .netns_ok =     1,
1432 };
1433 #endif
1434
1435 static const struct net_protocol tcp_protocol = {
1436         .handler =      tcp_v4_rcv,
1437         .err_handler =  tcp_v4_err,
1438         .gso_send_check = tcp_v4_gso_send_check,
1439         .gso_segment =  tcp_tso_segment,
1440         .gro_receive =  tcp4_gro_receive,
1441         .gro_complete = tcp4_gro_complete,
1442         .no_policy =    1,
1443         .netns_ok =     1,
1444 };
1445
1446 static const struct net_protocol udp_protocol = {
1447         .handler =      udp_rcv,
1448         .err_handler =  udp_err,
1449         .gso_send_check = udp4_ufo_send_check,
1450         .gso_segment = udp4_ufo_fragment,
1451         .no_policy =    1,
1452         .netns_ok =     1,
1453 };
1454
1455 static const struct net_protocol icmp_protocol = {
1456         .handler =      icmp_rcv,
1457         .no_policy =    1,
1458         .netns_ok =     1,
1459 };
1460
1461 static __net_init int ipv4_mib_init_net(struct net *net)
1462 {
1463         if (snmp_mib_init((void **)net->mib.tcp_statistics,
1464                           sizeof(struct tcp_mib)) < 0)
1465                 goto err_tcp_mib;
1466         if (snmp_mib_init((void **)net->mib.ip_statistics,
1467                           sizeof(struct ipstats_mib)) < 0)
1468                 goto err_ip_mib;
1469         if (snmp_mib_init((void **)net->mib.net_statistics,
1470                           sizeof(struct linux_mib)) < 0)
1471                 goto err_net_mib;
1472         if (snmp_mib_init((void **)net->mib.udp_statistics,
1473                           sizeof(struct udp_mib)) < 0)
1474                 goto err_udp_mib;
1475         if (snmp_mib_init((void **)net->mib.udplite_statistics,
1476                           sizeof(struct udp_mib)) < 0)
1477                 goto err_udplite_mib;
1478         if (snmp_mib_init((void **)net->mib.icmp_statistics,
1479                           sizeof(struct icmp_mib)) < 0)
1480                 goto err_icmp_mib;
1481         if (snmp_mib_init((void **)net->mib.icmpmsg_statistics,
1482                           sizeof(struct icmpmsg_mib)) < 0)
1483                 goto err_icmpmsg_mib;
1484
1485         tcp_mib_init(net);
1486         return 0;
1487
1488 err_icmpmsg_mib:
1489         snmp_mib_free((void **)net->mib.icmp_statistics);
1490 err_icmp_mib:
1491         snmp_mib_free((void **)net->mib.udplite_statistics);
1492 err_udplite_mib:
1493         snmp_mib_free((void **)net->mib.udp_statistics);
1494 err_udp_mib:
1495         snmp_mib_free((void **)net->mib.net_statistics);
1496 err_net_mib:
1497         snmp_mib_free((void **)net->mib.ip_statistics);
1498 err_ip_mib:
1499         snmp_mib_free((void **)net->mib.tcp_statistics);
1500 err_tcp_mib:
1501         return -ENOMEM;
1502 }
1503
1504 static __net_exit void ipv4_mib_exit_net(struct net *net)
1505 {
1506         snmp_mib_free((void **)net->mib.icmpmsg_statistics);
1507         snmp_mib_free((void **)net->mib.icmp_statistics);
1508         snmp_mib_free((void **)net->mib.udplite_statistics);
1509         snmp_mib_free((void **)net->mib.udp_statistics);
1510         snmp_mib_free((void **)net->mib.net_statistics);
1511         snmp_mib_free((void **)net->mib.ip_statistics);
1512         snmp_mib_free((void **)net->mib.tcp_statistics);
1513 }
1514
1515 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1516         .init = ipv4_mib_init_net,
1517         .exit = ipv4_mib_exit_net,
1518 };
1519
1520 static int __init init_ipv4_mibs(void)
1521 {
1522         return register_pernet_subsys(&ipv4_mib_ops);
1523 }
1524
1525 static int ipv4_proc_init(void);
1526
1527 /*
1528  *      IP protocol layer initialiser
1529  */
1530
1531 static struct packet_type ip_packet_type __read_mostly = {
1532         .type = cpu_to_be16(ETH_P_IP),
1533         .func = ip_rcv,
1534         .gso_send_check = inet_gso_send_check,
1535         .gso_segment = inet_gso_segment,
1536         .gro_receive = inet_gro_receive,
1537         .gro_complete = inet_gro_complete,
1538 };
1539
1540 static int __init inet_init(void)
1541 {
1542         struct sk_buff *dummy_skb;
1543         struct inet_protosw *q;
1544         struct list_head *r;
1545         int rc = -EINVAL;
1546
1547         BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
1548
1549         rc = proto_register(&tcp_prot, 1);
1550         if (rc)
1551                 goto out;
1552
1553         rc = proto_register(&udp_prot, 1);
1554         if (rc)
1555                 goto out_unregister_tcp_proto;
1556
1557         rc = proto_register(&raw_prot, 1);
1558         if (rc)
1559                 goto out_unregister_udp_proto;
1560
1561         /*
1562          *      Tell SOCKET that we are alive...
1563          */
1564
1565         (void)sock_register(&inet_family_ops);
1566
1567 #ifdef CONFIG_SYSCTL
1568         ip_static_sysctl_init();
1569 #endif
1570
1571         /*
1572          *      Add all the base protocols.
1573          */
1574
1575         if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1576                 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1577         if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1578                 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1579         if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1580                 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1581 #ifdef CONFIG_IP_MULTICAST
1582         if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1583                 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1584 #endif
1585
1586         /* Register the socket-side information for inet_create. */
1587         for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1588                 INIT_LIST_HEAD(r);
1589
1590         for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1591                 inet_register_protosw(q);
1592
1593         /*
1594          *      Set the ARP module up
1595          */
1596
1597         arp_init();
1598
1599         /*
1600          *      Set the IP module up
1601          */
1602
1603         ip_init();
1604
1605         tcp_v4_init();
1606
1607         /* Setup TCP slab cache for open requests. */
1608         tcp_init();
1609
1610         /* Setup UDP memory threshold */
1611         udp_init();
1612
1613         /* Add UDP-Lite (RFC 3828) */
1614         udplite4_register();
1615
1616         /*
1617          *      Set the ICMP layer up
1618          */
1619
1620         if (icmp_init() < 0)
1621                 panic("Failed to create the ICMP control socket.\n");
1622
1623         /*
1624          *      Initialise the multicast router
1625          */
1626 #if defined(CONFIG_IP_MROUTE)
1627         if (ip_mr_init())
1628                 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n");
1629 #endif
1630         /*
1631          *      Initialise per-cpu ipv4 mibs
1632          */
1633
1634         if (init_ipv4_mibs())
1635                 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n");
1636
1637         ipv4_proc_init();
1638
1639         ipfrag_init();
1640
1641         dev_add_pack(&ip_packet_type);
1642
1643         rc = 0;
1644 out:
1645         return rc;
1646 out_unregister_udp_proto:
1647         proto_unregister(&udp_prot);
1648 out_unregister_tcp_proto:
1649         proto_unregister(&tcp_prot);
1650         goto out;
1651 }
1652
1653 fs_initcall(inet_init);
1654
1655 /* ------------------------------------------------------------------------ */
1656
1657 #ifdef CONFIG_PROC_FS
1658 static int __init ipv4_proc_init(void)
1659 {
1660         int rc = 0;
1661
1662         if (raw_proc_init())
1663                 goto out_raw;
1664         if (tcp4_proc_init())
1665                 goto out_tcp;
1666         if (udp4_proc_init())
1667                 goto out_udp;
1668         if (ip_misc_proc_init())
1669                 goto out_misc;
1670 out:
1671         return rc;
1672 out_misc:
1673         udp4_proc_exit();
1674 out_udp:
1675         tcp4_proc_exit();
1676 out_tcp:
1677         raw_proc_exit();
1678 out_raw:
1679         rc = -ENOMEM;
1680         goto out;
1681 }
1682
1683 #else /* CONFIG_PROC_FS */
1684 static int __init ipv4_proc_init(void)
1685 {
1686         return 0;
1687 }
1688 #endif /* CONFIG_PROC_FS */
1689
1690 MODULE_ALIAS_NETPROTO(PF_INET);
1691