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ocfs2/dlm: remove potential deadlock -V3
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / af_inet6.c
blob3f9e86b15e0d867e1b85125b4521edbc0092054d
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 /* Free flowlabels */
421 fl6_free_socklist(sk);
422
423 /* Free tx options */
424
425 if ((opt = xchg(&np->opt, NULL)) != NULL)
426 sock_kfree_s(sk, opt, opt->tot_len);
427 }
428
429 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
430
431 /*
432 * This does both peername and sockname.
433 */
434
435 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
436 int *uaddr_len, int peer)
437 {
438 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
439 struct sock *sk = sock->sk;
440 struct inet_sock *inet = inet_sk(sk);
441 struct ipv6_pinfo *np = inet6_sk(sk);
442
443 sin->sin6_family = AF_INET6;
444 sin->sin6_flowinfo = 0;
445 sin->sin6_scope_id = 0;
446 if (peer) {
447 if (!inet->inet_dport)
448 return -ENOTCONN;
449 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
450 peer == 1)
451 return -ENOTCONN;
452 sin->sin6_port = inet->inet_dport;
453 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
454 if (np->sndflow)
455 sin->sin6_flowinfo = np->flow_label;
456 } else {
457 if (ipv6_addr_any(&np->rcv_saddr))
458 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
459 else
460 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
461
462 sin->sin6_port = inet->inet_sport;
463 }
464 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
465 sin->sin6_scope_id = sk->sk_bound_dev_if;
466 *uaddr_len = sizeof(*sin);
467 return(0);
468 }
469
470 EXPORT_SYMBOL(inet6_getname);
471
472 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
473 {
474 struct sock *sk = sock->sk;
475 struct net *net = sock_net(sk);
476
477 switch(cmd)
478 {
479 case SIOCGSTAMP:
480 return sock_get_timestamp(sk, (struct timeval __user *)arg);
481
482 case SIOCGSTAMPNS:
483 return sock_get_timestampns(sk, (struct timespec __user *)arg);
484
485 case SIOCADDRT:
486 case SIOCDELRT:
487
488 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
489
490 case SIOCSIFADDR:
491 return addrconf_add_ifaddr(net, (void __user *) arg);
492 case SIOCDIFADDR:
493 return addrconf_del_ifaddr(net, (void __user *) arg);
494 case SIOCSIFDSTADDR:
495 return addrconf_set_dstaddr(net, (void __user *) arg);
496 default:
497 if (!sk->sk_prot->ioctl)
498 return -ENOIOCTLCMD;
499 return sk->sk_prot->ioctl(sk, cmd, arg);
500 }
501 /*NOTREACHED*/
502 return(0);
503 }
504
505 EXPORT_SYMBOL(inet6_ioctl);
506
507 const struct proto_ops inet6_stream_ops = {
508 .family = PF_INET6,
509 .owner = THIS_MODULE,
510 .release = inet6_release,
511 .bind = inet6_bind,
512 .connect = inet_stream_connect, /* ok */
513 .socketpair = sock_no_socketpair, /* a do nothing */
514 .accept = inet_accept, /* ok */
515 .getname = inet6_getname,
516 .poll = tcp_poll, /* ok */
517 .ioctl = inet6_ioctl, /* must change */
518 .listen = inet_listen, /* ok */
519 .shutdown = inet_shutdown, /* ok */
520 .setsockopt = sock_common_setsockopt, /* ok */
521 .getsockopt = sock_common_getsockopt, /* ok */
522 .sendmsg = tcp_sendmsg, /* ok */
523 .recvmsg = sock_common_recvmsg, /* ok */
524 .mmap = sock_no_mmap,
525 .sendpage = tcp_sendpage,
526 .splice_read = tcp_splice_read,
527 #ifdef CONFIG_COMPAT
528 .compat_setsockopt = compat_sock_common_setsockopt,
529 .compat_getsockopt = compat_sock_common_getsockopt,
530 #endif
531 };
532
533 const struct proto_ops inet6_dgram_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 = udp_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 const struct net_proto_family inet6_family_ops = {
559 .family = PF_INET6,
560 .create = inet6_create,
561 .owner = THIS_MODULE,
562 };
563
564 int inet6_register_protosw(struct inet_protosw *p)
565 {
566 struct list_head *lh;
567 struct inet_protosw *answer;
568 struct list_head *last_perm;
569 int protocol = p->protocol;
570 int ret;
571
572 spin_lock_bh(&inetsw6_lock);
573
574 ret = -EINVAL;
575 if (p->type >= SOCK_MAX)
576 goto out_illegal;
577
578 /* If we are trying to override a permanent protocol, bail. */
579 answer = NULL;
580 ret = -EPERM;
581 last_perm = &inetsw6[p->type];
582 list_for_each(lh, &inetsw6[p->type]) {
583 answer = list_entry(lh, struct inet_protosw, list);
584
585 /* Check only the non-wild match. */
586 if (INET_PROTOSW_PERMANENT & answer->flags) {
587 if (protocol == answer->protocol)
588 break;
589 last_perm = lh;
590 }
591
592 answer = NULL;
593 }
594 if (answer)
595 goto out_permanent;
596
597 /* Add the new entry after the last permanent entry if any, so that
598 * the new entry does not override a permanent entry when matched with
599 * a wild-card protocol. But it is allowed to override any existing
600 * non-permanent entry. This means that when we remove this entry, the
601 * system automatically returns to the old behavior.
602 */
603 list_add_rcu(&p->list, last_perm);
604 ret = 0;
605 out:
606 spin_unlock_bh(&inetsw6_lock);
607 return ret;
608
609 out_permanent:
610 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
611 protocol);
612 goto out;
613
614 out_illegal:
615 printk(KERN_ERR
616 "Ignoring attempt to register invalid socket type %d.\n",
617 p->type);
618 goto out;
619 }
620
621 EXPORT_SYMBOL(inet6_register_protosw);
622
623 void
624 inet6_unregister_protosw(struct inet_protosw *p)
625 {
626 if (INET_PROTOSW_PERMANENT & p->flags) {
627 printk(KERN_ERR
628 "Attempt to unregister permanent protocol %d.\n",
629 p->protocol);
630 } else {
631 spin_lock_bh(&inetsw6_lock);
632 list_del_rcu(&p->list);
633 spin_unlock_bh(&inetsw6_lock);
634
635 synchronize_net();
636 }
637 }
638
639 EXPORT_SYMBOL(inet6_unregister_protosw);
640
641 int inet6_sk_rebuild_header(struct sock *sk)
642 {
643 int err;
644 struct dst_entry *dst;
645 struct ipv6_pinfo *np = inet6_sk(sk);
646
647 dst = __sk_dst_check(sk, np->dst_cookie);
648
649 if (dst == NULL) {
650 struct inet_sock *inet = inet_sk(sk);
651 struct in6_addr *final_p = NULL, final;
652 struct flowi fl;
653
654 memset(&fl, 0, sizeof(fl));
655 fl.proto = sk->sk_protocol;
656 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
657 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
658 fl.fl6_flowlabel = np->flow_label;
659 fl.oif = sk->sk_bound_dev_if;
660 fl.mark = sk->sk_mark;
661 fl.fl_ip_dport = inet->inet_dport;
662 fl.fl_ip_sport = inet->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(sock_net(sk), &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 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
716 {
717 const struct inet6_protocol *ops = NULL;
718
719 for (;;) {
720 struct ipv6_opt_hdr *opth;
721 int len;
722
723 if (proto != NEXTHDR_HOP) {
724 ops = rcu_dereference(inet6_protos[proto]);
725
726 if (unlikely(!ops))
727 break;
728
729 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
730 break;
731 }
732
733 if (unlikely(!pskb_may_pull(skb, 8)))
734 break;
735
736 opth = (void *)skb->data;
737 len = ipv6_optlen(opth);
738
739 if (unlikely(!pskb_may_pull(skb, len)))
740 break;
741
742 proto = opth->nexthdr;
743 __skb_pull(skb, len);
744 }
745
746 return proto;
747 }
748
749 static int ipv6_gso_send_check(struct sk_buff *skb)
750 {
751 struct ipv6hdr *ipv6h;
752 const struct inet6_protocol *ops;
753 int err = -EINVAL;
754
755 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
756 goto out;
757
758 ipv6h = ipv6_hdr(skb);
759 __skb_pull(skb, sizeof(*ipv6h));
760 err = -EPROTONOSUPPORT;
761
762 rcu_read_lock();
763 ops = rcu_dereference(inet6_protos[
764 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
765
766 if (likely(ops && ops->gso_send_check)) {
767 skb_reset_transport_header(skb);
768 err = ops->gso_send_check(skb);
769 }
770 rcu_read_unlock();
771
772 out:
773 return err;
774 }
775
776 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
777 {
778 struct sk_buff *segs = ERR_PTR(-EINVAL);
779 struct ipv6hdr *ipv6h;
780 const struct inet6_protocol *ops;
781 int proto;
782 struct frag_hdr *fptr;
783 unsigned int unfrag_ip6hlen;
784 u8 *prevhdr;
785 int offset = 0;
786
787 if (!(features & NETIF_F_V6_CSUM))
788 features &= ~NETIF_F_SG;
789
790 if (unlikely(skb_shinfo(skb)->gso_type &
791 ~(SKB_GSO_UDP |
792 SKB_GSO_DODGY |
793 SKB_GSO_TCP_ECN |
794 SKB_GSO_TCPV6 |
795 0)))
796 goto out;
797
798 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
799 goto out;
800
801 ipv6h = ipv6_hdr(skb);
802 __skb_pull(skb, sizeof(*ipv6h));
803 segs = ERR_PTR(-EPROTONOSUPPORT);
804
805 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
806 rcu_read_lock();
807 ops = rcu_dereference(inet6_protos[proto]);
808 if (likely(ops && ops->gso_segment)) {
809 skb_reset_transport_header(skb);
810 segs = ops->gso_segment(skb, features);
811 }
812 rcu_read_unlock();
813
814 if (unlikely(IS_ERR(segs)))
815 goto out;
816
817 for (skb = segs; skb; skb = skb->next) {
818 ipv6h = ipv6_hdr(skb);
819 ipv6h->payload_len = htons(skb->len - skb->mac_len -
820 sizeof(*ipv6h));
821 if (proto == IPPROTO_UDP) {
822 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
823 fptr = (struct frag_hdr *)(skb_network_header(skb) +
824 unfrag_ip6hlen);
825 fptr->frag_off = htons(offset);
826 if (skb->next != NULL)
827 fptr->frag_off |= htons(IP6_MF);
828 offset += (ntohs(ipv6h->payload_len) -
829 sizeof(struct frag_hdr));
830 }
831 }
832
833 out:
834 return segs;
835 }
836
837 struct ipv6_gro_cb {
838 struct napi_gro_cb napi;
839 int proto;
840 };
841
842 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
843
844 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
845 struct sk_buff *skb)
846 {
847 const struct inet6_protocol *ops;
848 struct sk_buff **pp = NULL;
849 struct sk_buff *p;
850 struct ipv6hdr *iph;
851 unsigned int nlen;
852 unsigned int hlen;
853 unsigned int off;
854 int flush = 1;
855 int proto;
856 __wsum csum;
857
858 off = skb_gro_offset(skb);
859 hlen = off + sizeof(*iph);
860 iph = skb_gro_header_fast(skb, off);
861 if (skb_gro_header_hard(skb, hlen)) {
862 iph = skb_gro_header_slow(skb, hlen, off);
863 if (unlikely(!iph))
864 goto out;
865 }
866
867 skb_gro_pull(skb, sizeof(*iph));
868 skb_set_transport_header(skb, skb_gro_offset(skb));
869
870 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
871
872 rcu_read_lock();
873 proto = iph->nexthdr;
874 ops = rcu_dereference(inet6_protos[proto]);
875 if (!ops || !ops->gro_receive) {
876 __pskb_pull(skb, skb_gro_offset(skb));
877 proto = ipv6_gso_pull_exthdrs(skb, proto);
878 skb_gro_pull(skb, -skb_transport_offset(skb));
879 skb_reset_transport_header(skb);
880 __skb_push(skb, skb_gro_offset(skb));
881
882 if (!ops || !ops->gro_receive)
883 goto out_unlock;
884
885 iph = ipv6_hdr(skb);
886 }
887
888 IPV6_GRO_CB(skb)->proto = proto;
889
890 flush--;
891 nlen = skb_network_header_len(skb);
892
893 for (p = *head; p; p = p->next) {
894 struct ipv6hdr *iph2;
895
896 if (!NAPI_GRO_CB(p)->same_flow)
897 continue;
898
899 iph2 = ipv6_hdr(p);
900
901 /* All fields must match except length. */
902 if (nlen != skb_network_header_len(p) ||
903 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
904 memcmp(&iph->nexthdr, &iph2->nexthdr,
905 nlen - offsetof(struct ipv6hdr, nexthdr))) {
906 NAPI_GRO_CB(p)->same_flow = 0;
907 continue;
908 }
909
910 NAPI_GRO_CB(p)->flush |= flush;
911 }
912
913 NAPI_GRO_CB(skb)->flush |= flush;
914
915 csum = skb->csum;
916 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
917
918 pp = ops->gro_receive(head, skb);
919
920 skb->csum = csum;
921
922 out_unlock:
923 rcu_read_unlock();
924
925 out:
926 NAPI_GRO_CB(skb)->flush |= flush;
927
928 return pp;
929 }
930
931 static int ipv6_gro_complete(struct sk_buff *skb)
932 {
933 const struct inet6_protocol *ops;
934 struct ipv6hdr *iph = ipv6_hdr(skb);
935 int err = -ENOSYS;
936
937 iph->payload_len = htons(skb->len - skb_network_offset(skb) -
938 sizeof(*iph));
939
940 rcu_read_lock();
941 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
942 if (WARN_ON(!ops || !ops->gro_complete))
943 goto out_unlock;
944
945 err = ops->gro_complete(skb);
946
947 out_unlock:
948 rcu_read_unlock();
949
950 return err;
951 }
952
953 static struct packet_type ipv6_packet_type __read_mostly = {
954 .type = cpu_to_be16(ETH_P_IPV6),
955 .func = ipv6_rcv,
956 .gso_send_check = ipv6_gso_send_check,
957 .gso_segment = ipv6_gso_segment,
958 .gro_receive = ipv6_gro_receive,
959 .gro_complete = ipv6_gro_complete,
960 };
961
962 static int __init ipv6_packet_init(void)
963 {
964 dev_add_pack(&ipv6_packet_type);
965 return 0;
966 }
967
968 static void ipv6_packet_cleanup(void)
969 {
970 dev_remove_pack(&ipv6_packet_type);
971 }
972
973 static int __net_init ipv6_init_mibs(struct net *net)
974 {
975 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
976 sizeof (struct udp_mib)) < 0)
977 return -ENOMEM;
978 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
979 sizeof (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)) < 0)
983 goto err_ip_mib;
984 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
985 sizeof(struct icmpv6_mib)) < 0)
986 goto err_icmp_mib;
987 if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics,
988 sizeof(struct icmpv6msg_mib)) < 0)
989 goto err_icmpmsg_mib;
990 return 0;
991
992 err_icmpmsg_mib:
993 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
994 err_icmp_mib:
995 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
996 err_ip_mib:
997 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
998 err_udplite_mib:
999 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1000 return -ENOMEM;
1001 }
1002
1003 static void ipv6_cleanup_mibs(struct net *net)
1004 {
1005 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1006 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1007 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1008 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1009 snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics);
1010 }
1011
1012 static int __net_init inet6_net_init(struct net *net)
1013 {
1014 int err = 0;
1015
1016 net->ipv6.sysctl.bindv6only = 0;
1017 net->ipv6.sysctl.icmpv6_time = 1*HZ;
1018
1019 err = ipv6_init_mibs(net);
1020 if (err)
1021 return err;
1022 #ifdef CONFIG_PROC_FS
1023 err = udp6_proc_init(net);
1024 if (err)
1025 goto out;
1026 err = tcp6_proc_init(net);
1027 if (err)
1028 goto proc_tcp6_fail;
1029 err = ac6_proc_init(net);
1030 if (err)
1031 goto proc_ac6_fail;
1032 #endif
1033 return err;
1034
1035 #ifdef CONFIG_PROC_FS
1036 proc_ac6_fail:
1037 tcp6_proc_exit(net);
1038 proc_tcp6_fail:
1039 udp6_proc_exit(net);
1040 out:
1041 ipv6_cleanup_mibs(net);
1042 return err;
1043 #endif
1044 }
1045
1046 static void __net_exit inet6_net_exit(struct net *net)
1047 {
1048 #ifdef CONFIG_PROC_FS
1049 udp6_proc_exit(net);
1050 tcp6_proc_exit(net);
1051 ac6_proc_exit(net);
1052 #endif
1053 ipv6_cleanup_mibs(net);
1054 }
1055
1056 static struct pernet_operations inet6_net_ops = {
1057 .init = inet6_net_init,
1058 .exit = inet6_net_exit,
1059 };
1060
1061 static int __init inet6_init(void)
1062 {
1063 struct sk_buff *dummy_skb;
1064 struct list_head *r;
1065 int err = 0;
1066
1067 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1068
1069 /* Register the socket-side information for inet6_create. */
1070 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1071 INIT_LIST_HEAD(r);
1072
1073 if (disable_ipv6_mod) {
1074 printk(KERN_INFO
1075 "IPv6: Loaded, but administratively disabled, "
1076 "reboot required to enable\n");
1077 goto out;
1078 }
1079
1080 err = proto_register(&tcpv6_prot, 1);
1081 if (err)
1082 goto out;
1083
1084 err = proto_register(&udpv6_prot, 1);
1085 if (err)
1086 goto out_unregister_tcp_proto;
1087
1088 err = proto_register(&udplitev6_prot, 1);
1089 if (err)
1090 goto out_unregister_udp_proto;
1091
1092 err = proto_register(&rawv6_prot, 1);
1093 if (err)
1094 goto out_unregister_udplite_proto;
1095
1096
1097 /* We MUST register RAW sockets before we create the ICMP6,
1098 * IGMP6, or NDISC control sockets.
1099 */
1100 err = rawv6_init();
1101 if (err)
1102 goto out_unregister_raw_proto;
1103
1104 /* Register the family here so that the init calls below will
1105 * be able to create sockets. (?? is this dangerous ??)
1106 */
1107 err = sock_register(&inet6_family_ops);
1108 if (err)
1109 goto out_sock_register_fail;
1110
1111 #ifdef CONFIG_SYSCTL
1112 err = ipv6_static_sysctl_register();
1113 if (err)
1114 goto static_sysctl_fail;
1115 #endif
1116 /*
1117 * ipngwg API draft makes clear that the correct semantics
1118 * for TCP and UDP is to consider one TCP and UDP instance
1119 * in a host availiable by both INET and INET6 APIs and
1120 * able to communicate via both network protocols.
1121 */
1122
1123 err = register_pernet_subsys(&inet6_net_ops);
1124 if (err)
1125 goto register_pernet_fail;
1126 err = icmpv6_init();
1127 if (err)
1128 goto icmp_fail;
1129 err = ip6_mr_init();
1130 if (err)
1131 goto ipmr_fail;
1132 err = ndisc_init();
1133 if (err)
1134 goto ndisc_fail;
1135 err = igmp6_init();
1136 if (err)
1137 goto igmp_fail;
1138 err = ipv6_netfilter_init();
1139 if (err)
1140 goto netfilter_fail;
1141 /* Create /proc/foo6 entries. */
1142 #ifdef CONFIG_PROC_FS
1143 err = -ENOMEM;
1144 if (raw6_proc_init())
1145 goto proc_raw6_fail;
1146 if (udplite6_proc_init())
1147 goto proc_udplite6_fail;
1148 if (ipv6_misc_proc_init())
1149 goto proc_misc6_fail;
1150 if (if6_proc_init())
1151 goto proc_if6_fail;
1152 #endif
1153 err = ip6_route_init();
1154 if (err)
1155 goto ip6_route_fail;
1156 err = ip6_flowlabel_init();
1157 if (err)
1158 goto ip6_flowlabel_fail;
1159 err = addrconf_init();
1160 if (err)
1161 goto addrconf_fail;
1162
1163 /* Init v6 extension headers. */
1164 err = ipv6_exthdrs_init();
1165 if (err)
1166 goto ipv6_exthdrs_fail;
1167
1168 err = ipv6_frag_init();
1169 if (err)
1170 goto ipv6_frag_fail;
1171
1172 /* Init v6 transport protocols. */
1173 err = udpv6_init();
1174 if (err)
1175 goto udpv6_fail;
1176
1177 err = udplitev6_init();
1178 if (err)
1179 goto udplitev6_fail;
1180
1181 err = tcpv6_init();
1182 if (err)
1183 goto tcpv6_fail;
1184
1185 err = ipv6_packet_init();
1186 if (err)
1187 goto ipv6_packet_fail;
1188
1189 #ifdef CONFIG_SYSCTL
1190 err = ipv6_sysctl_register();
1191 if (err)
1192 goto sysctl_fail;
1193 #endif
1194 out:
1195 return err;
1196
1197 #ifdef CONFIG_SYSCTL
1198 sysctl_fail:
1199 ipv6_packet_cleanup();
1200 #endif
1201 ipv6_packet_fail:
1202 tcpv6_exit();
1203 tcpv6_fail:
1204 udplitev6_exit();
1205 udplitev6_fail:
1206 udpv6_exit();
1207 udpv6_fail:
1208 ipv6_frag_exit();
1209 ipv6_frag_fail:
1210 ipv6_exthdrs_exit();
1211 ipv6_exthdrs_fail:
1212 addrconf_cleanup();
1213 addrconf_fail:
1214 ip6_flowlabel_cleanup();
1215 ip6_flowlabel_fail:
1216 ip6_route_cleanup();
1217 ip6_route_fail:
1218 #ifdef CONFIG_PROC_FS
1219 if6_proc_exit();
1220 proc_if6_fail:
1221 ipv6_misc_proc_exit();
1222 proc_misc6_fail:
1223 udplite6_proc_exit();
1224 proc_udplite6_fail:
1225 raw6_proc_exit();
1226 proc_raw6_fail:
1227 #endif
1228 ipv6_netfilter_fini();
1229 netfilter_fail:
1230 igmp6_cleanup();
1231 igmp_fail:
1232 ndisc_cleanup();
1233 ndisc_fail:
1234 ip6_mr_cleanup();
1235 ipmr_fail:
1236 icmpv6_cleanup();
1237 icmp_fail:
1238 unregister_pernet_subsys(&inet6_net_ops);
1239 register_pernet_fail:
1240 #ifdef CONFIG_SYSCTL
1241 ipv6_static_sysctl_unregister();
1242 static_sysctl_fail:
1243 #endif
1244 sock_unregister(PF_INET6);
1245 rtnl_unregister_all(PF_INET6);
1246 out_sock_register_fail:
1247 rawv6_exit();
1248 out_unregister_raw_proto:
1249 proto_unregister(&rawv6_prot);
1250 out_unregister_udplite_proto:
1251 proto_unregister(&udplitev6_prot);
1252 out_unregister_udp_proto:
1253 proto_unregister(&udpv6_prot);
1254 out_unregister_tcp_proto:
1255 proto_unregister(&tcpv6_prot);
1256 goto out;
1257 }
1258 module_init(inet6_init);
1259
1260 static void __exit inet6_exit(void)
1261 {
1262 if (disable_ipv6_mod)
1263 return;
1264
1265 /* First of all disallow new sockets creation. */
1266 sock_unregister(PF_INET6);
1267 /* Disallow any further netlink messages */
1268 rtnl_unregister_all(PF_INET6);
1269
1270 #ifdef CONFIG_SYSCTL
1271 ipv6_sysctl_unregister();
1272 #endif
1273 udpv6_exit();
1274 udplitev6_exit();
1275 tcpv6_exit();
1276
1277 /* Cleanup code parts. */
1278 ipv6_packet_cleanup();
1279 ipv6_frag_exit();
1280 ipv6_exthdrs_exit();
1281 addrconf_cleanup();
1282 ip6_flowlabel_cleanup();
1283 ip6_route_cleanup();
1284 #ifdef CONFIG_PROC_FS
1285
1286 /* Cleanup code parts. */
1287 if6_proc_exit();
1288 ipv6_misc_proc_exit();
1289 udplite6_proc_exit();
1290 raw6_proc_exit();
1291 #endif
1292 ipv6_netfilter_fini();
1293 igmp6_cleanup();
1294 ndisc_cleanup();
1295 ip6_mr_cleanup();
1296 icmpv6_cleanup();
1297 rawv6_exit();
1298
1299 unregister_pernet_subsys(&inet6_net_ops);
1300 #ifdef CONFIG_SYSCTL
1301 ipv6_static_sysctl_unregister();
1302 #endif
1303 proto_unregister(&rawv6_prot);
1304 proto_unregister(&udplitev6_prot);
1305 proto_unregister(&udpv6_prot);
1306 proto_unregister(&tcpv6_prot);
1307
1308 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1309 }
1310 module_exit(inet6_exit);
1311
1312 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree