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1 /*
2  *      PF_INET6 socket protocol family
3  *      Linux INET6 implementation
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>
7  *
8  *      Adapted from linux/net/ipv4/af_inet.c
9  *
10  *      $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
11  *
12  *      Fixes:
13  *      piggy, Karl Knutson     :       Socket protocol table
14  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
15  *      Arnaldo Melo            :       check proc_net_create return, cleanups
16  *
17  *      This program is free software; you can redistribute it and/or
18  *      modify it under the terms of the GNU General Public License
19  *      as published by the Free Software Foundation; either version
20  *      2 of the License, or (at your option) any later version.
21  */
22
23
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/in.h>
30 #include <linux/kernel.h>
31 #include <linux/timer.h>
32 #include <linux/string.h>
33 #include <linux/sockios.h>
34 #include <linux/net.h>
35 #include <linux/fcntl.h>
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <linux/proc_fs.h>
39 #include <linux/stat.h>
40 #include <linux/init.h>
41
42 #include <linux/inet.h>
43 #include <linux/netdevice.h>
44 #include <linux/icmpv6.h>
45 #include <linux/smp_lock.h>
46 #include <linux/netfilter_ipv6.h>
47
48 #include <net/ip.h>
49 #include <net/ipv6.h>
50 #include <net/udp.h>
51 #include <net/udplite.h>
52 #include <net/tcp.h>
53 #include <net/ipip.h>
54 #include <net/protocol.h>
55 #include <net/inet_common.h>
56 #include <net/transp_v6.h>
57 #include <net/ip6_route.h>
58 #include <net/addrconf.h>
59 #ifdef CONFIG_IPV6_TUNNEL
60 #include <net/ip6_tunnel.h>
61 #endif
62 #ifdef CONFIG_IPV6_MIP6
63 #include <net/mip6.h>
64 #endif
65
66 #include <asm/uaccess.h>
67 #include <asm/system.h>
68
69 MODULE_AUTHOR("Cast of dozens");
70 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
71 MODULE_LICENSE("GPL");
72
73 int sysctl_ipv6_bindv6only __read_mostly;
74
75 /* The inetsw table contains everything that inet_create needs to
76  * build a new socket.
77  */
78 static struct list_head inetsw6[SOCK_MAX];
79 static DEFINE_SPINLOCK(inetsw6_lock);
80
81 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
82 {
83         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
84
85         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
86 }
87
88 static int inet6_create(struct socket *sock, int protocol)
89 {
90         struct inet_sock *inet;
91         struct ipv6_pinfo *np;
92         struct sock *sk;
93         struct list_head *p;
94         struct inet_protosw *answer;
95         struct proto *answer_prot;
96         unsigned char answer_flags;
97         char answer_no_check;
98         int try_loading_module = 0;
99         int err;
100
101         if (sock->type != SOCK_RAW &&
102             sock->type != SOCK_DGRAM &&
103             !inet_ehash_secret)
104                 build_ehash_secret();
105
106         /* Look for the requested type/protocol pair. */
107         answer = NULL;
108 lookup_protocol:
109         err = -ESOCKTNOSUPPORT;
110         rcu_read_lock();
111         list_for_each_rcu(p, &inetsw6[sock->type]) {
112                 answer = list_entry(p, struct inet_protosw, list);
113
114                 /* Check the non-wild match. */
115                 if (protocol == answer->protocol) {
116                         if (protocol != IPPROTO_IP)
117                                 break;
118                 } else {
119                         /* Check for the two wild cases. */
120                         if (IPPROTO_IP == protocol) {
121                                 protocol = answer->protocol;
122                                 break;
123                         }
124                         if (IPPROTO_IP == answer->protocol)
125                                 break;
126                 }
127                 err = -EPROTONOSUPPORT;
128                 answer = NULL;
129         }
130
131         if (!answer) {
132                 if (try_loading_module < 2) {
133                         rcu_read_unlock();
134                         /*
135                          * Be more specific, e.g. net-pf-10-proto-132-type-1
136                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
137                          */
138                         if (++try_loading_module == 1)
139                                 request_module("net-pf-%d-proto-%d-type-%d",
140                                                 PF_INET6, protocol, sock->type);
141                         /*
142                          * Fall back to generic, e.g. net-pf-10-proto-132
143                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
144                          */
145                         else
146                                 request_module("net-pf-%d-proto-%d",
147                                                 PF_INET6, protocol);
148                         goto lookup_protocol;
149                 } else
150                         goto out_rcu_unlock;
151         }
152
153         err = -EPERM;
154         if (answer->capability > 0 && !capable(answer->capability))
155                 goto out_rcu_unlock;
156
157         sock->ops = answer->ops;
158         answer_prot = answer->prot;
159         answer_no_check = answer->no_check;
160         answer_flags = answer->flags;
161         rcu_read_unlock();
162
163         BUG_TRAP(answer_prot->slab != NULL);
164
165         err = -ENOBUFS;
166         sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
167         if (sk == NULL)
168                 goto out;
169
170         sock_init_data(sock, sk);
171
172         err = 0;
173         sk->sk_no_check = answer_no_check;
174         if (INET_PROTOSW_REUSE & answer_flags)
175                 sk->sk_reuse = 1;
176
177         inet = inet_sk(sk);
178         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
179
180         if (SOCK_RAW == sock->type) {
181                 inet->num = protocol;
182                 if (IPPROTO_RAW == protocol)
183                         inet->hdrincl = 1;
184         }
185
186         sk->sk_destruct         = inet_sock_destruct;
187         sk->sk_family           = PF_INET6;
188         sk->sk_protocol         = protocol;
189
190         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
191
192         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
193         np->hop_limit   = -1;
194         np->mcast_hops  = -1;
195         np->mc_loop     = 1;
196         np->pmtudisc    = IPV6_PMTUDISC_WANT;
197         np->ipv6only    = sysctl_ipv6_bindv6only;
198
199         /* Init the ipv4 part of the socket since we can have sockets
200          * using v6 API for ipv4.
201          */
202         inet->uc_ttl    = -1;
203
204         inet->mc_loop   = 1;
205         inet->mc_ttl    = 1;
206         inet->mc_index  = 0;
207         inet->mc_list   = NULL;
208
209         if (ipv4_config.no_pmtu_disc)
210                 inet->pmtudisc = IP_PMTUDISC_DONT;
211         else
212                 inet->pmtudisc = IP_PMTUDISC_WANT;
213         /*
214          * Increment only the relevant sk_prot->socks debug field, this changes
215          * the previous behaviour of incrementing both the equivalent to
216          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
217          *
218          * This allows better debug granularity as we'll know exactly how many
219          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
220          * transport protocol socks. -acme
221          */
222         sk_refcnt_debug_inc(sk);
223
224         if (inet->num) {
225                 /* It assumes that any protocol which allows
226                  * the user to assign a number at socket
227                  * creation time automatically shares.
228                  */
229                 inet->sport = htons(inet->num);
230                 sk->sk_prot->hash(sk);
231         }
232         if (sk->sk_prot->init) {
233                 err = sk->sk_prot->init(sk);
234                 if (err) {
235                         sk_common_release(sk);
236                         goto out;
237                 }
238         }
239 out:
240         return err;
241 out_rcu_unlock:
242         rcu_read_unlock();
243         goto out;
244 }
245
246
247 /* bind for INET6 API */
248 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
249 {
250         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
251         struct sock *sk = sock->sk;
252         struct inet_sock *inet = inet_sk(sk);
253         struct ipv6_pinfo *np = inet6_sk(sk);
254         __be32 v4addr = 0;
255         unsigned short snum;
256         int addr_type = 0;
257         int err = 0;
258
259         /* If the socket has its own bind function then use it. */
260         if (sk->sk_prot->bind)
261                 return sk->sk_prot->bind(sk, uaddr, addr_len);
262
263         if (addr_len < SIN6_LEN_RFC2133)
264                 return -EINVAL;
265         addr_type = ipv6_addr_type(&addr->sin6_addr);
266         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
267                 return -EINVAL;
268
269         snum = ntohs(addr->sin6_port);
270         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
271                 return -EACCES;
272
273         lock_sock(sk);
274
275         /* Check these errors (active socket, double bind). */
276         if (sk->sk_state != TCP_CLOSE || inet->num) {
277                 err = -EINVAL;
278                 goto out;
279         }
280
281         /* Check if the address belongs to the host. */
282         if (addr_type == IPV6_ADDR_MAPPED) {
283                 v4addr = addr->sin6_addr.s6_addr32[3];
284                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
285                         err = -EADDRNOTAVAIL;
286                         goto out;
287                 }
288         } else {
289                 if (addr_type != IPV6_ADDR_ANY) {
290                         struct net_device *dev = NULL;
291
292                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
293                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
294                                     addr->sin6_scope_id) {
295                                         /* Override any existing binding, if another one
296                                          * is supplied by user.
297                                          */
298                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
299                                 }
300
301                                 /* Binding to link-local address requires an interface */
302                                 if (!sk->sk_bound_dev_if) {
303                                         err = -EINVAL;
304                                         goto out;
305                                 }
306                                 dev = dev_get_by_index(sk->sk_bound_dev_if);
307                                 if (!dev) {
308                                         err = -ENODEV;
309                                         goto out;
310                                 }
311                         }
312
313                         /* ipv4 addr of the socket is invalid.  Only the
314                          * unspecified and mapped address have a v4 equivalent.
315                          */
316                         v4addr = LOOPBACK4_IPV6;
317                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
318                                 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
319                                         if (dev)
320                                                 dev_put(dev);
321                                         err = -EADDRNOTAVAIL;
322                                         goto out;
323                                 }
324                         }
325                         if (dev)
326                                 dev_put(dev);
327                 }
328         }
329
330         inet->rcv_saddr = v4addr;
331         inet->saddr = v4addr;
332
333         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
334
335         if (!(addr_type & IPV6_ADDR_MULTICAST))
336                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
337
338         /* Make sure we are allowed to bind here. */
339         if (sk->sk_prot->get_port(sk, snum)) {
340                 inet_reset_saddr(sk);
341                 err = -EADDRINUSE;
342                 goto out;
343         }
344
345         if (addr_type != IPV6_ADDR_ANY)
346                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
347         if (snum)
348                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
349         inet->sport = htons(inet->num);
350         inet->dport = 0;
351         inet->daddr = 0;
352 out:
353         release_sock(sk);
354         return err;
355 }
356
357 EXPORT_SYMBOL(inet6_bind);
358
359 int inet6_release(struct socket *sock)
360 {
361         struct sock *sk = sock->sk;
362
363         if (sk == NULL)
364                 return -EINVAL;
365
366         /* Free mc lists */
367         ipv6_sock_mc_close(sk);
368
369         /* Free ac lists */
370         ipv6_sock_ac_close(sk);
371
372         return inet_release(sock);
373 }
374
375 EXPORT_SYMBOL(inet6_release);
376
377 int inet6_destroy_sock(struct sock *sk)
378 {
379         struct ipv6_pinfo *np = inet6_sk(sk);
380         struct sk_buff *skb;
381         struct ipv6_txoptions *opt;
382
383         /* Release rx options */
384
385         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
386                 kfree_skb(skb);
387
388         /* Free flowlabels */
389         fl6_free_socklist(sk);
390
391         /* Free tx options */
392
393         if ((opt = xchg(&np->opt, NULL)) != NULL)
394                 sock_kfree_s(sk, opt, opt->tot_len);
395
396         return 0;
397 }
398
399 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
400
401 /*
402  *      This does both peername and sockname.
403  */
404
405 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
406                  int *uaddr_len, int peer)
407 {
408         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
409         struct sock *sk = sock->sk;
410         struct inet_sock *inet = inet_sk(sk);
411         struct ipv6_pinfo *np = inet6_sk(sk);
412
413         sin->sin6_family = AF_INET6;
414         sin->sin6_flowinfo = 0;
415         sin->sin6_scope_id = 0;
416         if (peer) {
417                 if (!inet->dport)
418                         return -ENOTCONN;
419                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
420                     peer == 1)
421                         return -ENOTCONN;
422                 sin->sin6_port = inet->dport;
423                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
424                 if (np->sndflow)
425                         sin->sin6_flowinfo = np->flow_label;
426         } else {
427                 if (ipv6_addr_any(&np->rcv_saddr))
428                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
429                 else
430                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
431
432                 sin->sin6_port = inet->sport;
433         }
434         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
435                 sin->sin6_scope_id = sk->sk_bound_dev_if;
436         *uaddr_len = sizeof(*sin);
437         return(0);
438 }
439
440 EXPORT_SYMBOL(inet6_getname);
441
442 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
443 {
444         struct sock *sk = sock->sk;
445
446         switch(cmd)
447         {
448         case SIOCGSTAMP:
449                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
450
451         case SIOCGSTAMPNS:
452                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
453
454         case SIOCADDRT:
455         case SIOCDELRT:
456
457                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
458
459         case SIOCSIFADDR:
460                 return addrconf_add_ifaddr((void __user *) arg);
461         case SIOCDIFADDR:
462                 return addrconf_del_ifaddr((void __user *) arg);
463         case SIOCSIFDSTADDR:
464                 return addrconf_set_dstaddr((void __user *) arg);
465         default:
466                 if (!sk->sk_prot->ioctl)
467                         return -ENOIOCTLCMD;
468                 return sk->sk_prot->ioctl(sk, cmd, arg);
469         }
470         /*NOTREACHED*/
471         return(0);
472 }
473
474 EXPORT_SYMBOL(inet6_ioctl);
475
476 const struct proto_ops inet6_stream_ops = {
477         .family            = PF_INET6,
478         .owner             = THIS_MODULE,
479         .release           = inet6_release,
480         .bind              = inet6_bind,
481         .connect           = inet_stream_connect,       /* ok           */
482         .socketpair        = sock_no_socketpair,        /* a do nothing */
483         .accept            = inet_accept,               /* ok           */
484         .getname           = inet6_getname,
485         .poll              = tcp_poll,                  /* ok           */
486         .ioctl             = inet6_ioctl,               /* must change  */
487         .listen            = inet_listen,               /* ok           */
488         .shutdown          = inet_shutdown,             /* ok           */
489         .setsockopt        = sock_common_setsockopt,    /* ok           */
490         .getsockopt        = sock_common_getsockopt,    /* ok           */
491         .sendmsg           = inet_sendmsg,              /* ok           */
492         .recvmsg           = sock_common_recvmsg,       /* ok           */
493         .mmap              = sock_no_mmap,
494         .sendpage          = tcp_sendpage,
495 #ifdef CONFIG_COMPAT
496         .compat_setsockopt = compat_sock_common_setsockopt,
497         .compat_getsockopt = compat_sock_common_getsockopt,
498 #endif
499 };
500
501 const struct proto_ops inet6_dgram_ops = {
502         .family            = PF_INET6,
503         .owner             = THIS_MODULE,
504         .release           = inet6_release,
505         .bind              = inet6_bind,
506         .connect           = inet_dgram_connect,        /* ok           */
507         .socketpair        = sock_no_socketpair,        /* a do nothing */
508         .accept            = sock_no_accept,            /* a do nothing */
509         .getname           = inet6_getname,
510         .poll              = udp_poll,                  /* ok           */
511         .ioctl             = inet6_ioctl,               /* must change  */
512         .listen            = sock_no_listen,            /* ok           */
513         .shutdown          = inet_shutdown,             /* ok           */
514         .setsockopt        = sock_common_setsockopt,    /* ok           */
515         .getsockopt        = sock_common_getsockopt,    /* ok           */
516         .sendmsg           = inet_sendmsg,              /* ok           */
517         .recvmsg           = sock_common_recvmsg,       /* ok           */
518         .mmap              = sock_no_mmap,
519         .sendpage          = sock_no_sendpage,
520 #ifdef CONFIG_COMPAT
521         .compat_setsockopt = compat_sock_common_setsockopt,
522         .compat_getsockopt = compat_sock_common_getsockopt,
523 #endif
524 };
525
526 static struct net_proto_family inet6_family_ops = {
527         .family = PF_INET6,
528         .create = inet6_create,
529         .owner  = THIS_MODULE,
530 };
531
532 /* Same as inet6_dgram_ops, sans udp_poll.  */
533 static const struct proto_ops inet6_sockraw_ops = {
534         .family            = PF_INET6,
535         .owner             = THIS_MODULE,
536         .release           = inet6_release,
537         .bind              = inet6_bind,
538         .connect           = inet_dgram_connect,        /* ok           */
539         .socketpair        = sock_no_socketpair,        /* a do nothing */
540         .accept            = sock_no_accept,            /* a do nothing */
541         .getname           = inet6_getname,
542         .poll              = datagram_poll,             /* ok           */
543         .ioctl             = inet6_ioctl,               /* must change  */
544         .listen            = sock_no_listen,            /* ok           */
545         .shutdown          = inet_shutdown,             /* ok           */
546         .setsockopt        = sock_common_setsockopt,    /* ok           */
547         .getsockopt        = sock_common_getsockopt,    /* ok           */
548         .sendmsg           = inet_sendmsg,              /* ok           */
549         .recvmsg           = sock_common_recvmsg,       /* ok           */
550         .mmap              = sock_no_mmap,
551         .sendpage          = sock_no_sendpage,
552 #ifdef CONFIG_COMPAT
553         .compat_setsockopt = compat_sock_common_setsockopt,
554         .compat_getsockopt = compat_sock_common_getsockopt,
555 #endif
556 };
557
558 static struct inet_protosw rawv6_protosw = {
559         .type           = SOCK_RAW,
560         .protocol       = IPPROTO_IP,   /* wild card */
561         .prot           = &rawv6_prot,
562         .ops            = &inet6_sockraw_ops,
563         .capability     = CAP_NET_RAW,
564         .no_check       = UDP_CSUM_DEFAULT,
565         .flags          = INET_PROTOSW_REUSE,
566 };
567
568 void
569 inet6_register_protosw(struct inet_protosw *p)
570 {
571         struct list_head *lh;
572         struct inet_protosw *answer;
573         int protocol = p->protocol;
574         struct list_head *last_perm;
575
576         spin_lock_bh(&inetsw6_lock);
577
578         if (p->type >= SOCK_MAX)
579                 goto out_illegal;
580
581         /* If we are trying to override a permanent protocol, bail. */
582         answer = NULL;
583         last_perm = &inetsw6[p->type];
584         list_for_each(lh, &inetsw6[p->type]) {
585                 answer = list_entry(lh, struct inet_protosw, list);
586
587                 /* Check only the non-wild match. */
588                 if (INET_PROTOSW_PERMANENT & answer->flags) {
589                         if (protocol == answer->protocol)
590                                 break;
591                         last_perm = lh;
592                 }
593
594                 answer = NULL;
595         }
596         if (answer)
597                 goto out_permanent;
598
599         /* Add the new entry after the last permanent entry if any, so that
600          * the new entry does not override a permanent entry when matched with
601          * a wild-card protocol. But it is allowed to override any existing
602          * non-permanent entry.  This means that when we remove this entry, the
603          * system automatically returns to the old behavior.
604          */
605         list_add_rcu(&p->list, last_perm);
606 out:
607         spin_unlock_bh(&inetsw6_lock);
608         return;
609
610 out_permanent:
611         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
612                protocol);
613         goto out;
614
615 out_illegal:
616         printk(KERN_ERR
617                "Ignoring attempt to register invalid socket type %d.\n",
618                p->type);
619         goto out;
620 }
621
622 EXPORT_SYMBOL(inet6_register_protosw);
623
624 void
625 inet6_unregister_protosw(struct inet_protosw *p)
626 {
627         if (INET_PROTOSW_PERMANENT & p->flags) {
628                 printk(KERN_ERR
629                        "Attempt to unregister permanent protocol %d.\n",
630                        p->protocol);
631         } else {
632                 spin_lock_bh(&inetsw6_lock);
633                 list_del_rcu(&p->list);
634                 spin_unlock_bh(&inetsw6_lock);
635
636                 synchronize_net();
637         }
638 }
639
640 EXPORT_SYMBOL(inet6_unregister_protosw);
641
642 int inet6_sk_rebuild_header(struct sock *sk)
643 {
644         int err;
645         struct dst_entry *dst;
646         struct ipv6_pinfo *np = inet6_sk(sk);
647
648         dst = __sk_dst_check(sk, np->dst_cookie);
649
650         if (dst == NULL) {
651                 struct inet_sock *inet = inet_sk(sk);
652                 struct in6_addr *final_p = NULL, final;
653                 struct flowi fl;
654
655                 memset(&fl, 0, sizeof(fl));
656                 fl.proto = sk->sk_protocol;
657                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
658                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
659                 fl.fl6_flowlabel = np->flow_label;
660                 fl.oif = sk->sk_bound_dev_if;
661                 fl.fl_ip_dport = inet->dport;
662                 fl.fl_ip_sport = inet->sport;
663                 security_sk_classify_flow(sk, &fl);
664
665                 if (np->opt && np->opt->srcrt) {
666                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
667                         ipv6_addr_copy(&final, &fl.fl6_dst);
668                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
669                         final_p = &final;
670                 }
671
672                 err = ip6_dst_lookup(sk, &dst, &fl);
673                 if (err) {
674                         sk->sk_route_caps = 0;
675                         return err;
676                 }
677                 if (final_p)
678                         ipv6_addr_copy(&fl.fl6_dst, final_p);
679
680                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
681                         sk->sk_err_soft = -err;
682                         return err;
683                 }
684
685                 __ip6_dst_store(sk, dst, NULL, NULL);
686         }
687
688         return 0;
689 }
690
691 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
692
693 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
694 {
695         struct ipv6_pinfo *np = inet6_sk(sk);
696         struct inet6_skb_parm *opt = IP6CB(skb);
697
698         if (np->rxopt.all) {
699                 if ((opt->hop && (np->rxopt.bits.hopopts ||
700                                   np->rxopt.bits.ohopopts)) ||
701                     ((IPV6_FLOWINFO_MASK &
702                       *(__be32 *)skb_network_header(skb)) &&
703                      np->rxopt.bits.rxflow) ||
704                     (opt->srcrt && (np->rxopt.bits.srcrt ||
705                      np->rxopt.bits.osrcrt)) ||
706                     ((opt->dst1 || opt->dst0) &&
707                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
708                         return 1;
709         }
710         return 0;
711 }
712
713 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
714
715 int
716 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
717 {
718         if (ptr == NULL)
719                 return -EINVAL;
720
721         ptr[0] = __alloc_percpu(mibsize);
722         if (!ptr[0])
723                 goto err0;
724
725         ptr[1] = __alloc_percpu(mibsize);
726         if (!ptr[1])
727                 goto err1;
728
729         return 0;
730
731 err1:
732         free_percpu(ptr[0]);
733         ptr[0] = NULL;
734 err0:
735         return -ENOMEM;
736 }
737
738 void
739 snmp6_mib_free(void *ptr[2])
740 {
741         if (ptr == NULL)
742                 return;
743         free_percpu(ptr[0]);
744         free_percpu(ptr[1]);
745         ptr[0] = ptr[1] = NULL;
746 }
747
748 static int __init init_ipv6_mibs(void)
749 {
750         if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
751                            __alignof__(struct ipstats_mib)) < 0)
752                 goto err_ip_mib;
753         if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
754                            __alignof__(struct icmpv6_mib)) < 0)
755                 goto err_icmp_mib;
756         if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
757                            __alignof__(struct udp_mib)) < 0)
758                 goto err_udp_mib;
759         if (snmp6_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
760                            __alignof__(struct udp_mib)) < 0)
761                 goto err_udplite_mib;
762         return 0;
763
764 err_udplite_mib:
765         snmp6_mib_free((void **)udp_stats_in6);
766 err_udp_mib:
767         snmp6_mib_free((void **)icmpv6_statistics);
768 err_icmp_mib:
769         snmp6_mib_free((void **)ipv6_statistics);
770 err_ip_mib:
771         return -ENOMEM;
772
773 }
774
775 static void cleanup_ipv6_mibs(void)
776 {
777         snmp6_mib_free((void **)ipv6_statistics);
778         snmp6_mib_free((void **)icmpv6_statistics);
779         snmp6_mib_free((void **)udp_stats_in6);
780         snmp6_mib_free((void **)udplite_stats_in6);
781 }
782
783 static int __init inet6_init(void)
784 {
785         struct sk_buff *dummy_skb;
786         struct list_head *r;
787         int err;
788
789         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
790
791 #ifdef MODULE
792 #if 0 /* FIXME --RR */
793         if (!mod_member_present(&__this_module, can_unload))
794           return -EINVAL;
795
796         __this_module.can_unload = &ipv6_unload;
797 #endif
798 #endif
799
800         err = proto_register(&tcpv6_prot, 1);
801         if (err)
802                 goto out;
803
804         err = proto_register(&udpv6_prot, 1);
805         if (err)
806                 goto out_unregister_tcp_proto;
807
808         err = proto_register(&udplitev6_prot, 1);
809         if (err)
810                 goto out_unregister_udp_proto;
811
812         err = proto_register(&rawv6_prot, 1);
813         if (err)
814                 goto out_unregister_udplite_proto;
815
816
817         /* Register the socket-side information for inet6_create.  */
818         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
819                 INIT_LIST_HEAD(r);
820
821         /* We MUST register RAW sockets before we create the ICMP6,
822          * IGMP6, or NDISC control sockets.
823          */
824         inet6_register_protosw(&rawv6_protosw);
825
826         /* Register the family here so that the init calls below will
827          * be able to create sockets. (?? is this dangerous ??)
828          */
829         err = sock_register(&inet6_family_ops);
830         if (err)
831                 goto out_unregister_raw_proto;
832
833         /* Initialise ipv6 mibs */
834         err = init_ipv6_mibs();
835         if (err)
836                 goto out_unregister_sock;
837
838         /*
839          *      ipngwg API draft makes clear that the correct semantics
840          *      for TCP and UDP is to consider one TCP and UDP instance
841          *      in a host availiable by both INET and INET6 APIs and
842          *      able to communicate via both network protocols.
843          */
844
845 #ifdef CONFIG_SYSCTL
846         ipv6_sysctl_register();
847 #endif
848         err = icmpv6_init(&inet6_family_ops);
849         if (err)
850                 goto icmp_fail;
851         err = ndisc_init(&inet6_family_ops);
852         if (err)
853                 goto ndisc_fail;
854         err = igmp6_init(&inet6_family_ops);
855         if (err)
856                 goto igmp_fail;
857         err = ipv6_netfilter_init();
858         if (err)
859                 goto netfilter_fail;
860         /* Create /proc/foo6 entries. */
861 #ifdef CONFIG_PROC_FS
862         err = -ENOMEM;
863         if (raw6_proc_init())
864                 goto proc_raw6_fail;
865         if (tcp6_proc_init())
866                 goto proc_tcp6_fail;
867         if (udp6_proc_init())
868                 goto proc_udp6_fail;
869         if (udplite6_proc_init())
870                 goto proc_udplite6_fail;
871         if (ipv6_misc_proc_init())
872                 goto proc_misc6_fail;
873
874         if (ac6_proc_init())
875                 goto proc_anycast6_fail;
876         if (if6_proc_init())
877                 goto proc_if6_fail;
878 #endif
879         ip6_route_init();
880         ip6_flowlabel_init();
881         err = addrconf_init();
882         if (err)
883                 goto addrconf_fail;
884
885         /* Init v6 extension headers. */
886         ipv6_rthdr_init();
887         ipv6_frag_init();
888         ipv6_nodata_init();
889         ipv6_destopt_init();
890 #ifdef CONFIG_IPV6_MIP6
891         mip6_init();
892 #endif
893
894         /* Init v6 transport protocols. */
895         udpv6_init();
896         udplitev6_init();
897         tcpv6_init();
898
899         ipv6_packet_init();
900         err = 0;
901 out:
902         return err;
903
904 addrconf_fail:
905         ip6_flowlabel_cleanup();
906         ip6_route_cleanup();
907 #ifdef CONFIG_PROC_FS
908         if6_proc_exit();
909 proc_if6_fail:
910         ac6_proc_exit();
911 proc_anycast6_fail:
912         ipv6_misc_proc_exit();
913 proc_misc6_fail:
914         udplite6_proc_exit();
915 proc_udplite6_fail:
916         udp6_proc_exit();
917 proc_udp6_fail:
918         tcp6_proc_exit();
919 proc_tcp6_fail:
920         raw6_proc_exit();
921 proc_raw6_fail:
922 #endif
923         ipv6_netfilter_fini();
924 netfilter_fail:
925         igmp6_cleanup();
926 igmp_fail:
927         ndisc_cleanup();
928 ndisc_fail:
929         icmpv6_cleanup();
930 icmp_fail:
931 #ifdef CONFIG_SYSCTL
932         ipv6_sysctl_unregister();
933 #endif
934         cleanup_ipv6_mibs();
935 out_unregister_sock:
936         sock_unregister(PF_INET6);
937 out_unregister_raw_proto:
938         proto_unregister(&rawv6_prot);
939 out_unregister_udplite_proto:
940         proto_unregister(&udplitev6_prot);
941 out_unregister_udp_proto:
942         proto_unregister(&udpv6_prot);
943 out_unregister_tcp_proto:
944         proto_unregister(&tcpv6_prot);
945         goto out;
946 }
947 module_init(inet6_init);
948
949 static void __exit inet6_exit(void)
950 {
951         /* First of all disallow new sockets creation. */
952         sock_unregister(PF_INET6);
953         /* Disallow any further netlink messages */
954         rtnl_unregister_all(PF_INET6);
955
956         /* Cleanup code parts. */
957         ipv6_packet_cleanup();
958 #ifdef CONFIG_IPV6_MIP6
959         mip6_fini();
960 #endif
961         addrconf_cleanup();
962         ip6_flowlabel_cleanup();
963         ip6_route_cleanup();
964 #ifdef CONFIG_PROC_FS
965
966         /* Cleanup code parts. */
967         if6_proc_exit();
968         ac6_proc_exit();
969         ipv6_misc_proc_exit();
970         udplite6_proc_exit();
971         udp6_proc_exit();
972         tcp6_proc_exit();
973         raw6_proc_exit();
974 #endif
975         ipv6_netfilter_fini();
976         igmp6_cleanup();
977         ndisc_cleanup();
978         icmpv6_cleanup();
979 #ifdef CONFIG_SYSCTL
980         ipv6_sysctl_unregister();
981 #endif
982         cleanup_ipv6_mibs();
983         proto_unregister(&rawv6_prot);
984         proto_unregister(&udplitev6_prot);
985         proto_unregister(&udpv6_prot);
986         proto_unregister(&tcpv6_prot);
987 }
988 module_exit(inet6_exit);
989
990 MODULE_ALIAS_NETPROTO(PF_INET6);