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Staging: brcm80211: remove __cplusplus markers
[linux/fpc-iii.git] / net / ipv6 / af_inet6.c
blob56b9bf2516f4d45b5b866e1e3086f54a05a7b530
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 * Fixes:
11 * piggy, Karl Knutson : Socket protocol table
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * Arnaldo Melo : check proc_net_create return, cleanups
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21
22 #include <linux/module.h>
23 #include <linux/capability.h>
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/in.h>
28 #include <linux/kernel.h>
29 #include <linux/timer.h>
30 #include <linux/string.h>
31 #include <linux/sockios.h>
32 #include <linux/net.h>
33 #include <linux/fcntl.h>
34 #include <linux/mm.h>
35 #include <linux/interrupt.h>
36 #include <linux/proc_fs.h>
37 #include <linux/stat.h>
38 #include <linux/init.h>
39 #include <linux/slab.h>
40
41 #include <linux/inet.h>
42 #include <linux/netdevice.h>
43 #include <linux/icmpv6.h>
44 #include <linux/netfilter_ipv6.h>
45
46 #include <net/ip.h>
47 #include <net/ipv6.h>
48 #include <net/udp.h>
49 #include <net/udplite.h>
50 #include <net/tcp.h>
51 #include <net/ipip.h>
52 #include <net/protocol.h>
53 #include <net/inet_common.h>
54 #include <net/route.h>
55 #include <net/transp_v6.h>
56 #include <net/ip6_route.h>
57 #include <net/addrconf.h>
58 #ifdef CONFIG_IPV6_TUNNEL
59 #include <net/ip6_tunnel.h>
60 #endif
61
62 #include <asm/uaccess.h>
63 #include <asm/system.h>
64 #include <linux/mroute6.h>
65
66 MODULE_AUTHOR("Cast of dozens");
67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
68 MODULE_LICENSE("GPL");
69
70 /* The inetsw6 table contains everything that inet6_create needs to
71 * build a new socket.
72 */
73 static struct list_head inetsw6[SOCK_MAX];
74 static DEFINE_SPINLOCK(inetsw6_lock);
75
76 struct ipv6_params ipv6_defaults = {
77 .disable_ipv6 = 0,
78 .autoconf = 1,
79 };
80
81 static int disable_ipv6_mod = 0;
82
83 module_param_named(disable, disable_ipv6_mod, int, 0444);
84 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
85
86 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
87 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
88
89 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
90 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
91
92 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
93 {
94 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
95
96 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
97 }
98
99 static int inet6_create(struct net *net, struct socket *sock, int protocol,
100 int kern)
101 {
102 struct inet_sock *inet;
103 struct ipv6_pinfo *np;
104 struct sock *sk;
105 struct inet_protosw *answer;
106 struct proto *answer_prot;
107 unsigned char answer_flags;
108 char answer_no_check;
109 int try_loading_module = 0;
110 int err;
111
112 if (sock->type != SOCK_RAW &&
113 sock->type != SOCK_DGRAM &&
114 !inet_ehash_secret)
115 build_ehash_secret();
116
117 /* Look for the requested type/protocol pair. */
118 lookup_protocol:
119 err = -ESOCKTNOSUPPORT;
120 rcu_read_lock();
121 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
122
123 err = 0;
124 /* Check the non-wild match. */
125 if (protocol == answer->protocol) {
126 if (protocol != IPPROTO_IP)
127 break;
128 } else {
129 /* Check for the two wild cases. */
130 if (IPPROTO_IP == protocol) {
131 protocol = answer->protocol;
132 break;
133 }
134 if (IPPROTO_IP == answer->protocol)
135 break;
136 }
137 err = -EPROTONOSUPPORT;
138 }
139
140 if (err) {
141 if (try_loading_module < 2) {
142 rcu_read_unlock();
143 /*
144 * Be more specific, e.g. net-pf-10-proto-132-type-1
145 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
146 */
147 if (++try_loading_module == 1)
148 request_module("net-pf-%d-proto-%d-type-%d",
149 PF_INET6, protocol, sock->type);
150 /*
151 * Fall back to generic, e.g. net-pf-10-proto-132
152 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
153 */
154 else
155 request_module("net-pf-%d-proto-%d",
156 PF_INET6, protocol);
157 goto lookup_protocol;
158 } else
159 goto out_rcu_unlock;
160 }
161
162 err = -EPERM;
163 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
164 goto out_rcu_unlock;
165
166 sock->ops = answer->ops;
167 answer_prot = answer->prot;
168 answer_no_check = answer->no_check;
169 answer_flags = answer->flags;
170 rcu_read_unlock();
171
172 WARN_ON(answer_prot->slab == NULL);
173
174 err = -ENOBUFS;
175 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
176 if (sk == NULL)
177 goto out;
178
179 sock_init_data(sock, sk);
180
181 err = 0;
182 sk->sk_no_check = answer_no_check;
183 if (INET_PROTOSW_REUSE & answer_flags)
184 sk->sk_reuse = 1;
185
186 inet = inet_sk(sk);
187 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
188
189 if (SOCK_RAW == sock->type) {
190 inet->inet_num = protocol;
191 if (IPPROTO_RAW == protocol)
192 inet->hdrincl = 1;
193 }
194
195 sk->sk_destruct = inet_sock_destruct;
196 sk->sk_family = PF_INET6;
197 sk->sk_protocol = protocol;
198
199 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
200
201 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
202 np->hop_limit = -1;
203 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
204 np->mc_loop = 1;
205 np->pmtudisc = IPV6_PMTUDISC_WANT;
206 np->ipv6only = net->ipv6.sysctl.bindv6only;
207
208 /* Init the ipv4 part of the socket since we can have sockets
209 * using v6 API for ipv4.
210 */
211 inet->uc_ttl = -1;
212
213 inet->mc_loop = 1;
214 inet->mc_ttl = 1;
215 inet->mc_index = 0;
216 inet->mc_list = NULL;
217
218 if (ipv4_config.no_pmtu_disc)
219 inet->pmtudisc = IP_PMTUDISC_DONT;
220 else
221 inet->pmtudisc = IP_PMTUDISC_WANT;
222 /*
223 * Increment only the relevant sk_prot->socks debug field, this changes
224 * the previous behaviour of incrementing both the equivalent to
225 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
226 *
227 * This allows better debug granularity as we'll know exactly how many
228 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
229 * transport protocol socks. -acme
230 */
231 sk_refcnt_debug_inc(sk);
232
233 if (inet->inet_num) {
234 /* It assumes that any protocol which allows
235 * the user to assign a number at socket
236 * creation time automatically shares.
237 */
238 inet->inet_sport = htons(inet->inet_num);
239 sk->sk_prot->hash(sk);
240 }
241 if (sk->sk_prot->init) {
242 err = sk->sk_prot->init(sk);
243 if (err) {
244 sk_common_release(sk);
245 goto out;
246 }
247 }
248 out:
249 return err;
250 out_rcu_unlock:
251 rcu_read_unlock();
252 goto out;
253 }
254
255
256 /* bind for INET6 API */
257 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
258 {
259 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
260 struct sock *sk = sock->sk;
261 struct inet_sock *inet = inet_sk(sk);
262 struct ipv6_pinfo *np = inet6_sk(sk);
263 struct net *net = sock_net(sk);
264 __be32 v4addr = 0;
265 unsigned short snum;
266 int addr_type = 0;
267 int err = 0;
268
269 /* If the socket has its own bind function then use it. */
270 if (sk->sk_prot->bind)
271 return sk->sk_prot->bind(sk, uaddr, addr_len);
272
273 if (addr_len < SIN6_LEN_RFC2133)
274 return -EINVAL;
275 addr_type = ipv6_addr_type(&addr->sin6_addr);
276 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
277 return -EINVAL;
278
279 snum = ntohs(addr->sin6_port);
280 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
281 return -EACCES;
282
283 lock_sock(sk);
284
285 /* Check these errors (active socket, double bind). */
286 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
287 err = -EINVAL;
288 goto out;
289 }
290
291 /* Check if the address belongs to the host. */
292 if (addr_type == IPV6_ADDR_MAPPED) {
293 int chk_addr_ret;
294
295 /* Binding to v4-mapped address on a v6-only socket
296 * makes no sense
297 */
298 if (np->ipv6only) {
299 err = -EINVAL;
300 goto out;
301 }
302
303 /* Reproduce AF_INET checks to make the bindings consitant */
304 v4addr = addr->sin6_addr.s6_addr32[3];
305 chk_addr_ret = inet_addr_type(net, v4addr);
306 if (!sysctl_ip_nonlocal_bind &&
307 !(inet->freebind || inet->transparent) &&
308 v4addr != htonl(INADDR_ANY) &&
309 chk_addr_ret != RTN_LOCAL &&
310 chk_addr_ret != RTN_MULTICAST &&
311 chk_addr_ret != RTN_BROADCAST) {
312 err = -EADDRNOTAVAIL;
313 goto out;
314 }
315 } else {
316 if (addr_type != IPV6_ADDR_ANY) {
317 struct net_device *dev = NULL;
318
319 rcu_read_lock();
320 if (addr_type & IPV6_ADDR_LINKLOCAL) {
321 if (addr_len >= sizeof(struct sockaddr_in6) &&
322 addr->sin6_scope_id) {
323 /* Override any existing binding, if another one
324 * is supplied by user.
325 */
326 sk->sk_bound_dev_if = addr->sin6_scope_id;
327 }
328
329 /* Binding to link-local address requires an interface */
330 if (!sk->sk_bound_dev_if) {
331 err = -EINVAL;
332 goto out_unlock;
333 }
334 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
335 if (!dev) {
336 err = -ENODEV;
337 goto out_unlock;
338 }
339 }
340
341 /* ipv4 addr of the socket is invalid. Only the
342 * unspecified and mapped address have a v4 equivalent.
343 */
344 v4addr = LOOPBACK4_IPV6;
345 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
346 if (!ipv6_chk_addr(net, &addr->sin6_addr,
347 dev, 0)) {
348 err = -EADDRNOTAVAIL;
349 goto out_unlock;
350 }
351 }
352 rcu_read_unlock();
353 }
354 }
355
356 inet->inet_rcv_saddr = v4addr;
357 inet->inet_saddr = v4addr;
358
359 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
360
361 if (!(addr_type & IPV6_ADDR_MULTICAST))
362 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
363
364 /* Make sure we are allowed to bind here. */
365 if (sk->sk_prot->get_port(sk, snum)) {
366 inet_reset_saddr(sk);
367 err = -EADDRINUSE;
368 goto out;
369 }
370
371 if (addr_type != IPV6_ADDR_ANY) {
372 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
373 if (addr_type != IPV6_ADDR_MAPPED)
374 np->ipv6only = 1;
375 }
376 if (snum)
377 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
378 inet->inet_sport = htons(inet->inet_num);
379 inet->inet_dport = 0;
380 inet->inet_daddr = 0;
381 out:
382 release_sock(sk);
383 return err;
384 out_unlock:
385 rcu_read_unlock();
386 goto out;
387 }
388
389 EXPORT_SYMBOL(inet6_bind);
390
391 int inet6_release(struct socket *sock)
392 {
393 struct sock *sk = sock->sk;
394
395 if (sk == NULL)
396 return -EINVAL;
397
398 /* Free mc lists */
399 ipv6_sock_mc_close(sk);
400
401 /* Free ac lists */
402 ipv6_sock_ac_close(sk);
403
404 return inet_release(sock);
405 }
406
407 EXPORT_SYMBOL(inet6_release);
408
409 void inet6_destroy_sock(struct sock *sk)
410 {
411 struct ipv6_pinfo *np = inet6_sk(sk);
412 struct sk_buff *skb;
413 struct ipv6_txoptions *opt;
414
415 /* Release rx options */
416
417 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
418 kfree_skb(skb);
419
420 if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
421 kfree_skb(skb);
422
423 /* Free flowlabels */
424 fl6_free_socklist(sk);
425
426 /* Free tx options */
427
428 if ((opt = xchg(&np->opt, NULL)) != NULL)
429 sock_kfree_s(sk, opt, opt->tot_len);
430 }
431
432 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
433
434 /*
435 * This does both peername and sockname.
436 */
437
438 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
439 int *uaddr_len, int peer)
440 {
441 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
442 struct sock *sk = sock->sk;
443 struct inet_sock *inet = inet_sk(sk);
444 struct ipv6_pinfo *np = inet6_sk(sk);
445
446 sin->sin6_family = AF_INET6;
447 sin->sin6_flowinfo = 0;
448 sin->sin6_scope_id = 0;
449 if (peer) {
450 if (!inet->inet_dport)
451 return -ENOTCONN;
452 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
453 peer == 1)
454 return -ENOTCONN;
455 sin->sin6_port = inet->inet_dport;
456 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
457 if (np->sndflow)
458 sin->sin6_flowinfo = np->flow_label;
459 } else {
460 if (ipv6_addr_any(&np->rcv_saddr))
461 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
462 else
463 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
464
465 sin->sin6_port = inet->inet_sport;
466 }
467 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
468 sin->sin6_scope_id = sk->sk_bound_dev_if;
469 *uaddr_len = sizeof(*sin);
470 return(0);
471 }
472
473 EXPORT_SYMBOL(inet6_getname);
474
475 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
476 {
477 struct sock *sk = sock->sk;
478 struct net *net = sock_net(sk);
479
480 switch(cmd)
481 {
482 case SIOCGSTAMP:
483 return sock_get_timestamp(sk, (struct timeval __user *)arg);
484
485 case SIOCGSTAMPNS:
486 return sock_get_timestampns(sk, (struct timespec __user *)arg);
487
488 case SIOCADDRT:
489 case SIOCDELRT:
490
491 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
492
493 case SIOCSIFADDR:
494 return addrconf_add_ifaddr(net, (void __user *) arg);
495 case SIOCDIFADDR:
496 return addrconf_del_ifaddr(net, (void __user *) arg);
497 case SIOCSIFDSTADDR:
498 return addrconf_set_dstaddr(net, (void __user *) arg);
499 default:
500 if (!sk->sk_prot->ioctl)
501 return -ENOIOCTLCMD;
502 return sk->sk_prot->ioctl(sk, cmd, arg);
503 }
504 /*NOTREACHED*/
505 return(0);
506 }
507
508 EXPORT_SYMBOL(inet6_ioctl);
509
510 const struct proto_ops inet6_stream_ops = {
511 .family = PF_INET6,
512 .owner = THIS_MODULE,
513 .release = inet6_release,
514 .bind = inet6_bind,
515 .connect = inet_stream_connect, /* ok */
516 .socketpair = sock_no_socketpair, /* a do nothing */
517 .accept = inet_accept, /* ok */
518 .getname = inet6_getname,
519 .poll = tcp_poll, /* ok */
520 .ioctl = inet6_ioctl, /* must change */
521 .listen = inet_listen, /* ok */
522 .shutdown = inet_shutdown, /* ok */
523 .setsockopt = sock_common_setsockopt, /* ok */
524 .getsockopt = sock_common_getsockopt, /* ok */
525 .sendmsg = inet_sendmsg, /* ok */
526 .recvmsg = inet_recvmsg, /* ok */
527 .mmap = sock_no_mmap,
528 .sendpage = inet_sendpage,
529 .splice_read = tcp_splice_read,
530 #ifdef CONFIG_COMPAT
531 .compat_setsockopt = compat_sock_common_setsockopt,
532 .compat_getsockopt = compat_sock_common_getsockopt,
533 #endif
534 };
535
536 const struct proto_ops inet6_dgram_ops = {
537 .family = PF_INET6,
538 .owner = THIS_MODULE,
539 .release = inet6_release,
540 .bind = inet6_bind,
541 .connect = inet_dgram_connect, /* ok */
542 .socketpair = sock_no_socketpair, /* a do nothing */
543 .accept = sock_no_accept, /* a do nothing */
544 .getname = inet6_getname,
545 .poll = udp_poll, /* ok */
546 .ioctl = inet6_ioctl, /* must change */
547 .listen = sock_no_listen, /* ok */
548 .shutdown = inet_shutdown, /* ok */
549 .setsockopt = sock_common_setsockopt, /* ok */
550 .getsockopt = sock_common_getsockopt, /* ok */
551 .sendmsg = inet_sendmsg, /* ok */
552 .recvmsg = inet_recvmsg, /* ok */
553 .mmap = sock_no_mmap,
554 .sendpage = sock_no_sendpage,
555 #ifdef CONFIG_COMPAT
556 .compat_setsockopt = compat_sock_common_setsockopt,
557 .compat_getsockopt = compat_sock_common_getsockopt,
558 #endif
559 };
560
561 static const struct net_proto_family inet6_family_ops = {
562 .family = PF_INET6,
563 .create = inet6_create,
564 .owner = THIS_MODULE,
565 };
566
567 int inet6_register_protosw(struct inet_protosw *p)
568 {
569 struct list_head *lh;
570 struct inet_protosw *answer;
571 struct list_head *last_perm;
572 int protocol = p->protocol;
573 int ret;
574
575 spin_lock_bh(&inetsw6_lock);
576
577 ret = -EINVAL;
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 ret = -EPERM;
584 last_perm = &inetsw6[p->type];
585 list_for_each(lh, &inetsw6[p->type]) {
586 answer = list_entry(lh, struct inet_protosw, list);
587
588 /* Check only the non-wild match. */
589 if (INET_PROTOSW_PERMANENT & answer->flags) {
590 if (protocol == answer->protocol)
591 break;
592 last_perm = lh;
593 }
594
595 answer = NULL;
596 }
597 if (answer)
598 goto out_permanent;
599
600 /* Add the new entry after the last permanent entry if any, so that
601 * the new entry does not override a permanent entry when matched with
602 * a wild-card protocol. But it is allowed to override any existing
603 * non-permanent entry. This means that when we remove this entry, the
604 * system automatically returns to the old behavior.
605 */
606 list_add_rcu(&p->list, last_perm);
607 ret = 0;
608 out:
609 spin_unlock_bh(&inetsw6_lock);
610 return ret;
611
612 out_permanent:
613 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
614 protocol);
615 goto out;
616
617 out_illegal:
618 printk(KERN_ERR
619 "Ignoring attempt to register invalid socket type %d.\n",
620 p->type);
621 goto out;
622 }
623
624 EXPORT_SYMBOL(inet6_register_protosw);
625
626 void
627 inet6_unregister_protosw(struct inet_protosw *p)
628 {
629 if (INET_PROTOSW_PERMANENT & p->flags) {
630 printk(KERN_ERR
631 "Attempt to unregister permanent protocol %d.\n",
632 p->protocol);
633 } else {
634 spin_lock_bh(&inetsw6_lock);
635 list_del_rcu(&p->list);
636 spin_unlock_bh(&inetsw6_lock);
637
638 synchronize_net();
639 }
640 }
641
642 EXPORT_SYMBOL(inet6_unregister_protosw);
643
644 int inet6_sk_rebuild_header(struct sock *sk)
645 {
646 int err;
647 struct dst_entry *dst;
648 struct ipv6_pinfo *np = inet6_sk(sk);
649
650 dst = __sk_dst_check(sk, np->dst_cookie);
651
652 if (dst == NULL) {
653 struct inet_sock *inet = inet_sk(sk);
654 struct in6_addr *final_p, final;
655 struct flowi fl;
656
657 memset(&fl, 0, sizeof(fl));
658 fl.proto = sk->sk_protocol;
659 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
660 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
661 fl.fl6_flowlabel = np->flow_label;
662 fl.oif = sk->sk_bound_dev_if;
663 fl.mark = sk->sk_mark;
664 fl.fl_ip_dport = inet->inet_dport;
665 fl.fl_ip_sport = inet->inet_sport;
666 security_sk_classify_flow(sk, &fl);
667
668 final_p = fl6_update_dst(&fl, np->opt, &final);
669
670 err = ip6_dst_lookup(sk, &dst, &fl);
671 if (err) {
672 sk->sk_route_caps = 0;
673 return err;
674 }
675 if (final_p)
676 ipv6_addr_copy(&fl.fl6_dst, final_p);
677
678 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
679 sk->sk_err_soft = -err;
680 return err;
681 }
682
683 __ip6_dst_store(sk, dst, NULL, NULL);
684 }
685
686 return 0;
687 }
688
689 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
690
691 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
692 {
693 struct ipv6_pinfo *np = inet6_sk(sk);
694 struct inet6_skb_parm *opt = IP6CB(skb);
695
696 if (np->rxopt.all) {
697 if ((opt->hop && (np->rxopt.bits.hopopts ||
698 np->rxopt.bits.ohopopts)) ||
699 ((IPV6_FLOWINFO_MASK &
700 *(__be32 *)skb_network_header(skb)) &&
701 np->rxopt.bits.rxflow) ||
702 (opt->srcrt && (np->rxopt.bits.srcrt ||
703 np->rxopt.bits.osrcrt)) ||
704 ((opt->dst1 || opt->dst0) &&
705 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
706 return 1;
707 }
708 return 0;
709 }
710
711 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
712
713 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
714 {
715 const struct inet6_protocol *ops = NULL;
716
717 for (;;) {
718 struct ipv6_opt_hdr *opth;
719 int len;
720
721 if (proto != NEXTHDR_HOP) {
722 ops = rcu_dereference(inet6_protos[proto]);
723
724 if (unlikely(!ops))
725 break;
726
727 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
728 break;
729 }
730
731 if (unlikely(!pskb_may_pull(skb, 8)))
732 break;
733
734 opth = (void *)skb->data;
735 len = ipv6_optlen(opth);
736
737 if (unlikely(!pskb_may_pull(skb, len)))
738 break;
739
740 proto = opth->nexthdr;
741 __skb_pull(skb, len);
742 }
743
744 return proto;
745 }
746
747 static int ipv6_gso_send_check(struct sk_buff *skb)
748 {
749 struct ipv6hdr *ipv6h;
750 const struct inet6_protocol *ops;
751 int err = -EINVAL;
752
753 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
754 goto out;
755
756 ipv6h = ipv6_hdr(skb);
757 __skb_pull(skb, sizeof(*ipv6h));
758 err = -EPROTONOSUPPORT;
759
760 rcu_read_lock();
761 ops = rcu_dereference(inet6_protos[
762 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
763
764 if (likely(ops && ops->gso_send_check)) {
765 skb_reset_transport_header(skb);
766 err = ops->gso_send_check(skb);
767 }
768 rcu_read_unlock();
769
770 out:
771 return err;
772 }
773
774 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
775 {
776 struct sk_buff *segs = ERR_PTR(-EINVAL);
777 struct ipv6hdr *ipv6h;
778 const struct inet6_protocol *ops;
779 int proto;
780 struct frag_hdr *fptr;
781 unsigned int unfrag_ip6hlen;
782 u8 *prevhdr;
783 int offset = 0;
784
785 if (!(features & NETIF_F_V6_CSUM))
786 features &= ~NETIF_F_SG;
787
788 if (unlikely(skb_shinfo(skb)->gso_type &
789 ~(SKB_GSO_UDP |
790 SKB_GSO_DODGY |
791 SKB_GSO_TCP_ECN |
792 SKB_GSO_TCPV6 |
793 0)))
794 goto out;
795
796 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
797 goto out;
798
799 ipv6h = ipv6_hdr(skb);
800 __skb_pull(skb, sizeof(*ipv6h));
801 segs = ERR_PTR(-EPROTONOSUPPORT);
802
803 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
804 rcu_read_lock();
805 ops = rcu_dereference(inet6_protos[proto]);
806 if (likely(ops && ops->gso_segment)) {
807 skb_reset_transport_header(skb);
808 segs = ops->gso_segment(skb, features);
809 }
810 rcu_read_unlock();
811
812 if (unlikely(IS_ERR(segs)))
813 goto out;
814
815 for (skb = segs; skb; skb = skb->next) {
816 ipv6h = ipv6_hdr(skb);
817 ipv6h->payload_len = htons(skb->len - skb->mac_len -
818 sizeof(*ipv6h));
819 if (proto == IPPROTO_UDP) {
820 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
821 fptr = (struct frag_hdr *)(skb_network_header(skb) +
822 unfrag_ip6hlen);
823 fptr->frag_off = htons(offset);
824 if (skb->next != NULL)
825 fptr->frag_off |= htons(IP6_MF);
826 offset += (ntohs(ipv6h->payload_len) -
827 sizeof(struct frag_hdr));
828 }
829 }
830
831 out:
832 return segs;
833 }
834
835 struct ipv6_gro_cb {
836 struct napi_gro_cb napi;
837 int proto;
838 };
839
840 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
841
842 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
843 struct sk_buff *skb)
844 {
845 const struct inet6_protocol *ops;
846 struct sk_buff **pp = NULL;
847 struct sk_buff *p;
848 struct ipv6hdr *iph;
849 unsigned int nlen;
850 unsigned int hlen;
851 unsigned int off;
852 int flush = 1;
853 int proto;
854 __wsum csum;
855
856 off = skb_gro_offset(skb);
857 hlen = off + sizeof(*iph);
858 iph = skb_gro_header_fast(skb, off);
859 if (skb_gro_header_hard(skb, hlen)) {
860 iph = skb_gro_header_slow(skb, hlen, off);
861 if (unlikely(!iph))
862 goto out;
863 }
864
865 skb_gro_pull(skb, sizeof(*iph));
866 skb_set_transport_header(skb, skb_gro_offset(skb));
867
868 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
869
870 rcu_read_lock();
871 proto = iph->nexthdr;
872 ops = rcu_dereference(inet6_protos[proto]);
873 if (!ops || !ops->gro_receive) {
874 __pskb_pull(skb, skb_gro_offset(skb));
875 proto = ipv6_gso_pull_exthdrs(skb, proto);
876 skb_gro_pull(skb, -skb_transport_offset(skb));
877 skb_reset_transport_header(skb);
878 __skb_push(skb, skb_gro_offset(skb));
879
880 if (!ops || !ops->gro_receive)
881 goto out_unlock;
882
883 iph = ipv6_hdr(skb);
884 }
885
886 IPV6_GRO_CB(skb)->proto = proto;
887
888 flush--;
889 nlen = skb_network_header_len(skb);
890
891 for (p = *head; p; p = p->next) {
892 struct ipv6hdr *iph2;
893
894 if (!NAPI_GRO_CB(p)->same_flow)
895 continue;
896
897 iph2 = ipv6_hdr(p);
898
899 /* All fields must match except length. */
900 if (nlen != skb_network_header_len(p) ||
901 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
902 memcmp(&iph->nexthdr, &iph2->nexthdr,
903 nlen - offsetof(struct ipv6hdr, nexthdr))) {
904 NAPI_GRO_CB(p)->same_flow = 0;
905 continue;
906 }
907
908 NAPI_GRO_CB(p)->flush |= flush;
909 }
910
911 NAPI_GRO_CB(skb)->flush |= flush;
912
913 csum = skb->csum;
914 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
915
916 pp = ops->gro_receive(head, skb);
917
918 skb->csum = csum;
919
920 out_unlock:
921 rcu_read_unlock();
922
923 out:
924 NAPI_GRO_CB(skb)->flush |= flush;
925
926 return pp;
927 }
928
929 static int ipv6_gro_complete(struct sk_buff *skb)
930 {
931 const struct inet6_protocol *ops;
932 struct ipv6hdr *iph = ipv6_hdr(skb);
933 int err = -ENOSYS;
934
935 iph->payload_len = htons(skb->len - skb_network_offset(skb) -
936 sizeof(*iph));
937
938 rcu_read_lock();
939 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
940 if (WARN_ON(!ops || !ops->gro_complete))
941 goto out_unlock;
942
943 err = ops->gro_complete(skb);
944
945 out_unlock:
946 rcu_read_unlock();
947
948 return err;
949 }
950
951 static struct packet_type ipv6_packet_type __read_mostly = {
952 .type = cpu_to_be16(ETH_P_IPV6),
953 .func = ipv6_rcv,
954 .gso_send_check = ipv6_gso_send_check,
955 .gso_segment = ipv6_gso_segment,
956 .gro_receive = ipv6_gro_receive,
957 .gro_complete = ipv6_gro_complete,
958 };
959
960 static int __init ipv6_packet_init(void)
961 {
962 dev_add_pack(&ipv6_packet_type);
963 return 0;
964 }
965
966 static void ipv6_packet_cleanup(void)
967 {
968 dev_remove_pack(&ipv6_packet_type);
969 }
970
971 static int __net_init ipv6_init_mibs(struct net *net)
972 {
973 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
974 sizeof(struct udp_mib),
975 __alignof__(struct udp_mib)) < 0)
976 return -ENOMEM;
977 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
978 sizeof(struct udp_mib),
979 __alignof__(struct udp_mib)) < 0)
980 goto err_udplite_mib;
981 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
982 sizeof(struct ipstats_mib),
983 __alignof__(struct ipstats_mib)) < 0)
984 goto err_ip_mib;
985 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
986 sizeof(struct icmpv6_mib),
987 __alignof__(struct icmpv6_mib)) < 0)
988 goto err_icmp_mib;
989 if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics,
990 sizeof(struct icmpv6msg_mib),
991 __alignof__(struct icmpv6msg_mib)) < 0)
992 goto err_icmpmsg_mib;
993 return 0;
994
995 err_icmpmsg_mib:
996 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
997 err_icmp_mib:
998 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
999 err_ip_mib:
1000 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1001 err_udplite_mib:
1002 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1003 return -ENOMEM;
1004 }
1005
1006 static void ipv6_cleanup_mibs(struct net *net)
1007 {
1008 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1009 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1010 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1011 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1012 snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics);
1013 }
1014
1015 static int __net_init inet6_net_init(struct net *net)
1016 {
1017 int err = 0;
1018
1019 net->ipv6.sysctl.bindv6only = 0;
1020 net->ipv6.sysctl.icmpv6_time = 1*HZ;
1021
1022 err = ipv6_init_mibs(net);
1023 if (err)
1024 return err;
1025 #ifdef CONFIG_PROC_FS
1026 err = udp6_proc_init(net);
1027 if (err)
1028 goto out;
1029 err = tcp6_proc_init(net);
1030 if (err)
1031 goto proc_tcp6_fail;
1032 err = ac6_proc_init(net);
1033 if (err)
1034 goto proc_ac6_fail;
1035 #endif
1036 return err;
1037
1038 #ifdef CONFIG_PROC_FS
1039 proc_ac6_fail:
1040 tcp6_proc_exit(net);
1041 proc_tcp6_fail:
1042 udp6_proc_exit(net);
1043 out:
1044 ipv6_cleanup_mibs(net);
1045 return err;
1046 #endif
1047 }
1048
1049 static void __net_exit inet6_net_exit(struct net *net)
1050 {
1051 #ifdef CONFIG_PROC_FS
1052 udp6_proc_exit(net);
1053 tcp6_proc_exit(net);
1054 ac6_proc_exit(net);
1055 #endif
1056 ipv6_cleanup_mibs(net);
1057 }
1058
1059 static struct pernet_operations inet6_net_ops = {
1060 .init = inet6_net_init,
1061 .exit = inet6_net_exit,
1062 };
1063
1064 static int __init inet6_init(void)
1065 {
1066 struct sk_buff *dummy_skb;
1067 struct list_head *r;
1068 int err = 0;
1069
1070 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1071
1072 /* Register the socket-side information for inet6_create. */
1073 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1074 INIT_LIST_HEAD(r);
1075
1076 if (disable_ipv6_mod) {
1077 printk(KERN_INFO
1078 "IPv6: Loaded, but administratively disabled, "
1079 "reboot required to enable\n");
1080 goto out;
1081 }
1082
1083 err = proto_register(&tcpv6_prot, 1);
1084 if (err)
1085 goto out;
1086
1087 err = proto_register(&udpv6_prot, 1);
1088 if (err)
1089 goto out_unregister_tcp_proto;
1090
1091 err = proto_register(&udplitev6_prot, 1);
1092 if (err)
1093 goto out_unregister_udp_proto;
1094
1095 err = proto_register(&rawv6_prot, 1);
1096 if (err)
1097 goto out_unregister_udplite_proto;
1098
1099
1100 /* We MUST register RAW sockets before we create the ICMP6,
1101 * IGMP6, or NDISC control sockets.
1102 */
1103 err = rawv6_init();
1104 if (err)
1105 goto out_unregister_raw_proto;
1106
1107 /* Register the family here so that the init calls below will
1108 * be able to create sockets. (?? is this dangerous ??)
1109 */
1110 err = sock_register(&inet6_family_ops);
1111 if (err)
1112 goto out_sock_register_fail;
1113
1114 #ifdef CONFIG_SYSCTL
1115 err = ipv6_static_sysctl_register();
1116 if (err)
1117 goto static_sysctl_fail;
1118 #endif
1119 /*
1120 * ipngwg API draft makes clear that the correct semantics
1121 * for TCP and UDP is to consider one TCP and UDP instance
1122 * in a host availiable by both INET and INET6 APIs and
1123 * able to communicate via both network protocols.
1124 */
1125
1126 err = register_pernet_subsys(&inet6_net_ops);
1127 if (err)
1128 goto register_pernet_fail;
1129 err = icmpv6_init();
1130 if (err)
1131 goto icmp_fail;
1132 err = ip6_mr_init();
1133 if (err)
1134 goto ipmr_fail;
1135 err = ndisc_init();
1136 if (err)
1137 goto ndisc_fail;
1138 err = igmp6_init();
1139 if (err)
1140 goto igmp_fail;
1141 err = ipv6_netfilter_init();
1142 if (err)
1143 goto netfilter_fail;
1144 /* Create /proc/foo6 entries. */
1145 #ifdef CONFIG_PROC_FS
1146 err = -ENOMEM;
1147 if (raw6_proc_init())
1148 goto proc_raw6_fail;
1149 if (udplite6_proc_init())
1150 goto proc_udplite6_fail;
1151 if (ipv6_misc_proc_init())
1152 goto proc_misc6_fail;
1153 if (if6_proc_init())
1154 goto proc_if6_fail;
1155 #endif
1156 err = ip6_route_init();
1157 if (err)
1158 goto ip6_route_fail;
1159 err = ip6_flowlabel_init();
1160 if (err)
1161 goto ip6_flowlabel_fail;
1162 err = addrconf_init();
1163 if (err)
1164 goto addrconf_fail;
1165
1166 /* Init v6 extension headers. */
1167 err = ipv6_exthdrs_init();
1168 if (err)
1169 goto ipv6_exthdrs_fail;
1170
1171 err = ipv6_frag_init();
1172 if (err)
1173 goto ipv6_frag_fail;
1174
1175 /* Init v6 transport protocols. */
1176 err = udpv6_init();
1177 if (err)
1178 goto udpv6_fail;
1179
1180 err = udplitev6_init();
1181 if (err)
1182 goto udplitev6_fail;
1183
1184 err = tcpv6_init();
1185 if (err)
1186 goto tcpv6_fail;
1187
1188 err = ipv6_packet_init();
1189 if (err)
1190 goto ipv6_packet_fail;
1191
1192 #ifdef CONFIG_SYSCTL
1193 err = ipv6_sysctl_register();
1194 if (err)
1195 goto sysctl_fail;
1196 #endif
1197 out:
1198 return err;
1199
1200 #ifdef CONFIG_SYSCTL
1201 sysctl_fail:
1202 ipv6_packet_cleanup();
1203 #endif
1204 ipv6_packet_fail:
1205 tcpv6_exit();
1206 tcpv6_fail:
1207 udplitev6_exit();
1208 udplitev6_fail:
1209 udpv6_exit();
1210 udpv6_fail:
1211 ipv6_frag_exit();
1212 ipv6_frag_fail:
1213 ipv6_exthdrs_exit();
1214 ipv6_exthdrs_fail:
1215 addrconf_cleanup();
1216 addrconf_fail:
1217 ip6_flowlabel_cleanup();
1218 ip6_flowlabel_fail:
1219 ip6_route_cleanup();
1220 ip6_route_fail:
1221 #ifdef CONFIG_PROC_FS
1222 if6_proc_exit();
1223 proc_if6_fail:
1224 ipv6_misc_proc_exit();
1225 proc_misc6_fail:
1226 udplite6_proc_exit();
1227 proc_udplite6_fail:
1228 raw6_proc_exit();
1229 proc_raw6_fail:
1230 #endif
1231 ipv6_netfilter_fini();
1232 netfilter_fail:
1233 igmp6_cleanup();
1234 igmp_fail:
1235 ndisc_cleanup();
1236 ndisc_fail:
1237 ip6_mr_cleanup();
1238 ipmr_fail:
1239 icmpv6_cleanup();
1240 icmp_fail:
1241 unregister_pernet_subsys(&inet6_net_ops);
1242 register_pernet_fail:
1243 #ifdef CONFIG_SYSCTL
1244 ipv6_static_sysctl_unregister();
1245 static_sysctl_fail:
1246 #endif
1247 sock_unregister(PF_INET6);
1248 rtnl_unregister_all(PF_INET6);
1249 out_sock_register_fail:
1250 rawv6_exit();
1251 out_unregister_raw_proto:
1252 proto_unregister(&rawv6_prot);
1253 out_unregister_udplite_proto:
1254 proto_unregister(&udplitev6_prot);
1255 out_unregister_udp_proto:
1256 proto_unregister(&udpv6_prot);
1257 out_unregister_tcp_proto:
1258 proto_unregister(&tcpv6_prot);
1259 goto out;
1260 }
1261 module_init(inet6_init);
1262
1263 static void __exit inet6_exit(void)
1264 {
1265 if (disable_ipv6_mod)
1266 return;
1267
1268 /* First of all disallow new sockets creation. */
1269 sock_unregister(PF_INET6);
1270 /* Disallow any further netlink messages */
1271 rtnl_unregister_all(PF_INET6);
1272
1273 #ifdef CONFIG_SYSCTL
1274 ipv6_sysctl_unregister();
1275 #endif
1276 udpv6_exit();
1277 udplitev6_exit();
1278 tcpv6_exit();
1279
1280 /* Cleanup code parts. */
1281 ipv6_packet_cleanup();
1282 ipv6_frag_exit();
1283 ipv6_exthdrs_exit();
1284 addrconf_cleanup();
1285 ip6_flowlabel_cleanup();
1286 ip6_route_cleanup();
1287 #ifdef CONFIG_PROC_FS
1288
1289 /* Cleanup code parts. */
1290 if6_proc_exit();
1291 ipv6_misc_proc_exit();
1292 udplite6_proc_exit();
1293 raw6_proc_exit();
1294 #endif
1295 ipv6_netfilter_fini();
1296 igmp6_cleanup();
1297 ndisc_cleanup();
1298 ip6_mr_cleanup();
1299 icmpv6_cleanup();
1300 rawv6_exit();
1301
1302 unregister_pernet_subsys(&inet6_net_ops);
1303 #ifdef CONFIG_SYSCTL
1304 ipv6_static_sysctl_unregister();
1305 #endif
1306 proto_unregister(&rawv6_prot);
1307 proto_unregister(&udplitev6_prot);
1308 proto_unregister(&udpv6_prot);
1309 proto_unregister(&tcpv6_prot);
1310
1311 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1312 }
1313 module_exit(inet6_exit);
1314
1315 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux with added FPC-III support