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net: spread __net_init, __net_exit
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / af_inet6.c
blobe29160ff4a0fe2615fe53fa8c7b15953698701b3
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
40 #include <linux/inet.h>
41 #include <linux/netdevice.h>
42 #include <linux/icmpv6.h>
43 #include <linux/netfilter_ipv6.h>
44
45 #include <net/ip.h>
46 #include <net/ipv6.h>
47 #include <net/udp.h>
48 #include <net/udplite.h>
49 #include <net/tcp.h>
50 #include <net/ipip.h>
51 #include <net/protocol.h>
52 #include <net/inet_common.h>
53 #include <net/route.h>
54 #include <net/transp_v6.h>
55 #include <net/ip6_route.h>
56 #include <net/addrconf.h>
57 #ifdef CONFIG_IPV6_TUNNEL
58 #include <net/ip6_tunnel.h>
59 #endif
60
61 #include <asm/uaccess.h>
62 #include <asm/system.h>
63 #include <linux/mroute6.h>
64
65 MODULE_AUTHOR("Cast of dozens");
66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67 MODULE_LICENSE("GPL");
68
69 /* The inetsw6 table contains everything that inet6_create needs to
70 * build a new socket.
71 */
72 static struct list_head inetsw6[SOCK_MAX];
73 static DEFINE_SPINLOCK(inetsw6_lock);
74
75 struct ipv6_params ipv6_defaults = {
76 .disable_ipv6 = 0,
77 .autoconf = 1,
78 };
79
80 static int disable_ipv6_mod = 0;
81
82 module_param_named(disable, disable_ipv6_mod, int, 0444);
83 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
84
85 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
86 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
87
88 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
89 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
90
91 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
92 {
93 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
94
95 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
96 }
97
98 static int inet6_create(struct net *net, struct socket *sock, int protocol,
99 int kern)
100 {
101 struct inet_sock *inet;
102 struct ipv6_pinfo *np;
103 struct sock *sk;
104 struct inet_protosw *answer;
105 struct proto *answer_prot;
106 unsigned char answer_flags;
107 char answer_no_check;
108 int try_loading_module = 0;
109 int err;
110
111 if (sock->type != SOCK_RAW &&
112 sock->type != SOCK_DGRAM &&
113 !inet_ehash_secret)
114 build_ehash_secret();
115
116 /* Look for the requested type/protocol pair. */
117 lookup_protocol:
118 err = -ESOCKTNOSUPPORT;
119 rcu_read_lock();
120 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
121
122 err = 0;
123 /* Check the non-wild match. */
124 if (protocol == answer->protocol) {
125 if (protocol != IPPROTO_IP)
126 break;
127 } else {
128 /* Check for the two wild cases. */
129 if (IPPROTO_IP == protocol) {
130 protocol = answer->protocol;
131 break;
132 }
133 if (IPPROTO_IP == answer->protocol)
134 break;
135 }
136 err = -EPROTONOSUPPORT;
137 }
138
139 if (err) {
140 if (try_loading_module < 2) {
141 rcu_read_unlock();
142 /*
143 * Be more specific, e.g. net-pf-10-proto-132-type-1
144 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
145 */
146 if (++try_loading_module == 1)
147 request_module("net-pf-%d-proto-%d-type-%d",
148 PF_INET6, protocol, sock->type);
149 /*
150 * Fall back to generic, e.g. net-pf-10-proto-132
151 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
152 */
153 else
154 request_module("net-pf-%d-proto-%d",
155 PF_INET6, protocol);
156 goto lookup_protocol;
157 } else
158 goto out_rcu_unlock;
159 }
160
161 err = -EPERM;
162 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
163 goto out_rcu_unlock;
164
165 sock->ops = answer->ops;
166 answer_prot = answer->prot;
167 answer_no_check = answer->no_check;
168 answer_flags = answer->flags;
169 rcu_read_unlock();
170
171 WARN_ON(answer_prot->slab == NULL);
172
173 err = -ENOBUFS;
174 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
175 if (sk == NULL)
176 goto out;
177
178 sock_init_data(sock, sk);
179
180 err = 0;
181 sk->sk_no_check = answer_no_check;
182 if (INET_PROTOSW_REUSE & answer_flags)
183 sk->sk_reuse = 1;
184
185 inet = inet_sk(sk);
186 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
187
188 if (SOCK_RAW == sock->type) {
189 inet->inet_num = protocol;
190 if (IPPROTO_RAW == protocol)
191 inet->hdrincl = 1;
192 }
193
194 sk->sk_destruct = inet_sock_destruct;
195 sk->sk_family = PF_INET6;
196 sk->sk_protocol = protocol;
197
198 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
199
200 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
201 np->hop_limit = -1;
202 np->mcast_hops = -1;
203 np->mc_loop = 1;
204 np->pmtudisc = IPV6_PMTUDISC_WANT;
205 np->ipv6only = net->ipv6.sysctl.bindv6only;
206
207 /* Init the ipv4 part of the socket since we can have sockets
208 * using v6 API for ipv4.
209 */
210 inet->uc_ttl = -1;
211
212 inet->mc_loop = 1;
213 inet->mc_ttl = 1;
214 inet->mc_index = 0;
215 inet->mc_list = NULL;
216
217 if (ipv4_config.no_pmtu_disc)
218 inet->pmtudisc = IP_PMTUDISC_DONT;
219 else
220 inet->pmtudisc = IP_PMTUDISC_WANT;
221 /*
222 * Increment only the relevant sk_prot->socks debug field, this changes
223 * the previous behaviour of incrementing both the equivalent to
224 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
225 *
226 * This allows better debug granularity as we'll know exactly how many
227 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
228 * transport protocol socks. -acme
229 */
230 sk_refcnt_debug_inc(sk);
231
232 if (inet->inet_num) {
233 /* It assumes that any protocol which allows
234 * the user to assign a number at socket
235 * creation time automatically shares.
236 */
237 inet->inet_sport = htons(inet->inet_num);
238 sk->sk_prot->hash(sk);
239 }
240 if (sk->sk_prot->init) {
241 err = sk->sk_prot->init(sk);
242 if (err) {
243 sk_common_release(sk);
244 goto out;
245 }
246 }
247 out:
248 return err;
249 out_rcu_unlock:
250 rcu_read_unlock();
251 goto out;
252 }
253
254
255 /* bind for INET6 API */
256 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
257 {
258 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
259 struct sock *sk = sock->sk;
260 struct inet_sock *inet = inet_sk(sk);
261 struct ipv6_pinfo *np = inet6_sk(sk);
262 struct net *net = sock_net(sk);
263 __be32 v4addr = 0;
264 unsigned short snum;
265 int addr_type = 0;
266 int err = 0;
267
268 /* If the socket has its own bind function then use it. */
269 if (sk->sk_prot->bind)
270 return sk->sk_prot->bind(sk, uaddr, addr_len);
271
272 if (addr_len < SIN6_LEN_RFC2133)
273 return -EINVAL;
274 addr_type = ipv6_addr_type(&addr->sin6_addr);
275 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
276 return -EINVAL;
277
278 snum = ntohs(addr->sin6_port);
279 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
280 return -EACCES;
281
282 lock_sock(sk);
283
284 /* Check these errors (active socket, double bind). */
285 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
286 err = -EINVAL;
287 goto out;
288 }
289
290 /* Check if the address belongs to the host. */
291 if (addr_type == IPV6_ADDR_MAPPED) {
292 int chk_addr_ret;
293
294 /* Binding to v4-mapped address on a v6-only socket
295 * makes no sense
296 */
297 if (np->ipv6only) {
298 err = -EINVAL;
299 goto out;
300 }
301
302 /* Reproduce AF_INET checks to make the bindings consitant */
303 v4addr = addr->sin6_addr.s6_addr32[3];
304 chk_addr_ret = inet_addr_type(net, v4addr);
305 if (!sysctl_ip_nonlocal_bind &&
306 !(inet->freebind || inet->transparent) &&
307 v4addr != htonl(INADDR_ANY) &&
308 chk_addr_ret != RTN_LOCAL &&
309 chk_addr_ret != RTN_MULTICAST &&
310 chk_addr_ret != RTN_BROADCAST) {
311 err = -EADDRNOTAVAIL;
312 goto out;
313 }
314 } else {
315 if (addr_type != IPV6_ADDR_ANY) {
316 struct net_device *dev = NULL;
317
318 rcu_read_lock();
319 if (addr_type & IPV6_ADDR_LINKLOCAL) {
320 if (addr_len >= sizeof(struct sockaddr_in6) &&
321 addr->sin6_scope_id) {
322 /* Override any existing binding, if another one
323 * is supplied by user.
324 */
325 sk->sk_bound_dev_if = addr->sin6_scope_id;
326 }
327
328 /* Binding to link-local address requires an interface */
329 if (!sk->sk_bound_dev_if) {
330 err = -EINVAL;
331 goto out_unlock;
332 }
333 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
334 if (!dev) {
335 err = -ENODEV;
336 goto out_unlock;
337 }
338 }
339
340 /* ipv4 addr of the socket is invalid. Only the
341 * unspecified and mapped address have a v4 equivalent.
342 */
343 v4addr = LOOPBACK4_IPV6;
344 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
345 if (!ipv6_chk_addr(net, &addr->sin6_addr,
346 dev, 0)) {
347 err = -EADDRNOTAVAIL;
348 goto out_unlock;
349 }
350 }
351 rcu_read_unlock();
352 }
353 }
354
355 inet->inet_rcv_saddr = v4addr;
356 inet->inet_saddr = v4addr;
357
358 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
359
360 if (!(addr_type & IPV6_ADDR_MULTICAST))
361 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
362
363 /* Make sure we are allowed to bind here. */
364 if (sk->sk_prot->get_port(sk, snum)) {
365 inet_reset_saddr(sk);
366 err = -EADDRINUSE;
367 goto out;
368 }
369
370 if (addr_type != IPV6_ADDR_ANY) {
371 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
372 if (addr_type != IPV6_ADDR_MAPPED)
373 np->ipv6only = 1;
374 }
375 if (snum)
376 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
377 inet->inet_sport = htons(inet->inet_num);
378 inet->inet_dport = 0;
379 inet->inet_daddr = 0;
380 out:
381 release_sock(sk);
382 return err;
383 out_unlock:
384 rcu_read_unlock();
385 goto out;
386 }
387
388 EXPORT_SYMBOL(inet6_bind);
389
390 int inet6_release(struct socket *sock)
391 {
392 struct sock *sk = sock->sk;
393
394 if (sk == NULL)
395 return -EINVAL;
396
397 /* Free mc lists */
398 ipv6_sock_mc_close(sk);
399
400 /* Free ac lists */
401 ipv6_sock_ac_close(sk);
402
403 return inet_release(sock);
404 }
405
406 EXPORT_SYMBOL(inet6_release);
407
408 void inet6_destroy_sock(struct sock *sk)
409 {
410 struct ipv6_pinfo *np = inet6_sk(sk);
411 struct sk_buff *skb;
412 struct ipv6_txoptions *opt;
413
414 /* Release rx options */
415
416 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
417 kfree_skb(skb);
418
419 /* Free flowlabels */
420 fl6_free_socklist(sk);
421
422 /* Free tx options */
423
424 if ((opt = xchg(&np->opt, NULL)) != NULL)
425 sock_kfree_s(sk, opt, opt->tot_len);
426 }
427
428 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
429
430 /*
431 * This does both peername and sockname.
432 */
433
434 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
435 int *uaddr_len, int peer)
436 {
437 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
438 struct sock *sk = sock->sk;
439 struct inet_sock *inet = inet_sk(sk);
440 struct ipv6_pinfo *np = inet6_sk(sk);
441
442 sin->sin6_family = AF_INET6;
443 sin->sin6_flowinfo = 0;
444 sin->sin6_scope_id = 0;
445 if (peer) {
446 if (!inet->inet_dport)
447 return -ENOTCONN;
448 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
449 peer == 1)
450 return -ENOTCONN;
451 sin->sin6_port = inet->inet_dport;
452 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
453 if (np->sndflow)
454 sin->sin6_flowinfo = np->flow_label;
455 } else {
456 if (ipv6_addr_any(&np->rcv_saddr))
457 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
458 else
459 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
460
461 sin->sin6_port = inet->inet_sport;
462 }
463 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
464 sin->sin6_scope_id = sk->sk_bound_dev_if;
465 *uaddr_len = sizeof(*sin);
466 return(0);
467 }
468
469 EXPORT_SYMBOL(inet6_getname);
470
471 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
472 {
473 struct sock *sk = sock->sk;
474 struct net *net = sock_net(sk);
475
476 switch(cmd)
477 {
478 case SIOCGSTAMP:
479 return sock_get_timestamp(sk, (struct timeval __user *)arg);
480
481 case SIOCGSTAMPNS:
482 return sock_get_timestampns(sk, (struct timespec __user *)arg);
483
484 case SIOCADDRT:
485 case SIOCDELRT:
486
487 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
488
489 case SIOCSIFADDR:
490 return addrconf_add_ifaddr(net, (void __user *) arg);
491 case SIOCDIFADDR:
492 return addrconf_del_ifaddr(net, (void __user *) arg);
493 case SIOCSIFDSTADDR:
494 return addrconf_set_dstaddr(net, (void __user *) arg);
495 default:
496 if (!sk->sk_prot->ioctl)
497 return -ENOIOCTLCMD;
498 return sk->sk_prot->ioctl(sk, cmd, arg);
499 }
500 /*NOTREACHED*/
501 return(0);
502 }
503
504 EXPORT_SYMBOL(inet6_ioctl);
505
506 const struct proto_ops inet6_stream_ops = {
507 .family = PF_INET6,
508 .owner = THIS_MODULE,
509 .release = inet6_release,
510 .bind = inet6_bind,
511 .connect = inet_stream_connect, /* ok */
512 .socketpair = sock_no_socketpair, /* a do nothing */
513 .accept = inet_accept, /* ok */
514 .getname = inet6_getname,
515 .poll = tcp_poll, /* ok */
516 .ioctl = inet6_ioctl, /* must change */
517 .listen = inet_listen, /* ok */
518 .shutdown = inet_shutdown, /* ok */
519 .setsockopt = sock_common_setsockopt, /* ok */
520 .getsockopt = sock_common_getsockopt, /* ok */
521 .sendmsg = tcp_sendmsg, /* ok */
522 .recvmsg = sock_common_recvmsg, /* ok */
523 .mmap = sock_no_mmap,
524 .sendpage = tcp_sendpage,
525 .splice_read = tcp_splice_read,
526 #ifdef CONFIG_COMPAT
527 .compat_setsockopt = compat_sock_common_setsockopt,
528 .compat_getsockopt = compat_sock_common_getsockopt,
529 #endif
530 };
531
532 const struct proto_ops inet6_dgram_ops = {
533 .family = PF_INET6,
534 .owner = THIS_MODULE,
535 .release = inet6_release,
536 .bind = inet6_bind,
537 .connect = inet_dgram_connect, /* ok */
538 .socketpair = sock_no_socketpair, /* a do nothing */
539 .accept = sock_no_accept, /* a do nothing */
540 .getname = inet6_getname,
541 .poll = udp_poll, /* ok */
542 .ioctl = inet6_ioctl, /* must change */
543 .listen = sock_no_listen, /* ok */
544 .shutdown = inet_shutdown, /* ok */
545 .setsockopt = sock_common_setsockopt, /* ok */
546 .getsockopt = sock_common_getsockopt, /* ok */
547 .sendmsg = inet_sendmsg, /* ok */
548 .recvmsg = sock_common_recvmsg, /* ok */
549 .mmap = sock_no_mmap,
550 .sendpage = sock_no_sendpage,
551 #ifdef CONFIG_COMPAT
552 .compat_setsockopt = compat_sock_common_setsockopt,
553 .compat_getsockopt = compat_sock_common_getsockopt,
554 #endif
555 };
556
557 static const struct net_proto_family inet6_family_ops = {
558 .family = PF_INET6,
559 .create = inet6_create,
560 .owner = THIS_MODULE,
561 };
562
563 int inet6_register_protosw(struct inet_protosw *p)
564 {
565 struct list_head *lh;
566 struct inet_protosw *answer;
567 struct list_head *last_perm;
568 int protocol = p->protocol;
569 int ret;
570
571 spin_lock_bh(&inetsw6_lock);
572
573 ret = -EINVAL;
574 if (p->type >= SOCK_MAX)
575 goto out_illegal;
576
577 /* If we are trying to override a permanent protocol, bail. */
578 answer = NULL;
579 ret = -EPERM;
580 last_perm = &inetsw6[p->type];
581 list_for_each(lh, &inetsw6[p->type]) {
582 answer = list_entry(lh, struct inet_protosw, list);
583
584 /* Check only the non-wild match. */
585 if (INET_PROTOSW_PERMANENT & answer->flags) {
586 if (protocol == answer->protocol)
587 break;
588 last_perm = lh;
589 }
590
591 answer = NULL;
592 }
593 if (answer)
594 goto out_permanent;
595
596 /* Add the new entry after the last permanent entry if any, so that
597 * the new entry does not override a permanent entry when matched with
598 * a wild-card protocol. But it is allowed to override any existing
599 * non-permanent entry. This means that when we remove this entry, the
600 * system automatically returns to the old behavior.
601 */
602 list_add_rcu(&p->list, last_perm);
603 ret = 0;
604 out:
605 spin_unlock_bh(&inetsw6_lock);
606 return ret;
607
608 out_permanent:
609 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
610 protocol);
611 goto out;
612
613 out_illegal:
614 printk(KERN_ERR
615 "Ignoring attempt to register invalid socket type %d.\n",
616 p->type);
617 goto out;
618 }
619
620 EXPORT_SYMBOL(inet6_register_protosw);
621
622 void
623 inet6_unregister_protosw(struct inet_protosw *p)
624 {
625 if (INET_PROTOSW_PERMANENT & p->flags) {
626 printk(KERN_ERR
627 "Attempt to unregister permanent protocol %d.\n",
628 p->protocol);
629 } else {
630 spin_lock_bh(&inetsw6_lock);
631 list_del_rcu(&p->list);
632 spin_unlock_bh(&inetsw6_lock);
633
634 synchronize_net();
635 }
636 }
637
638 EXPORT_SYMBOL(inet6_unregister_protosw);
639
640 int inet6_sk_rebuild_header(struct sock *sk)
641 {
642 int err;
643 struct dst_entry *dst;
644 struct ipv6_pinfo *np = inet6_sk(sk);
645
646 dst = __sk_dst_check(sk, np->dst_cookie);
647
648 if (dst == NULL) {
649 struct inet_sock *inet = inet_sk(sk);
650 struct in6_addr *final_p = NULL, final;
651 struct flowi fl;
652
653 memset(&fl, 0, sizeof(fl));
654 fl.proto = sk->sk_protocol;
655 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
656 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
657 fl.fl6_flowlabel = np->flow_label;
658 fl.oif = sk->sk_bound_dev_if;
659 fl.mark = sk->sk_mark;
660 fl.fl_ip_dport = inet->inet_dport;
661 fl.fl_ip_sport = inet->inet_sport;
662 security_sk_classify_flow(sk, &fl);
663
664 if (np->opt && np->opt->srcrt) {
665 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
666 ipv6_addr_copy(&final, &fl.fl6_dst);
667 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
668 final_p = &final;
669 }
670
671 err = ip6_dst_lookup(sk, &dst, &fl);
672 if (err) {
673 sk->sk_route_caps = 0;
674 return err;
675 }
676 if (final_p)
677 ipv6_addr_copy(&fl.fl6_dst, final_p);
678
679 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
680 sk->sk_err_soft = -err;
681 return err;
682 }
683
684 __ip6_dst_store(sk, dst, NULL, NULL);
685 }
686
687 return 0;
688 }
689
690 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
691
692 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
693 {
694 struct ipv6_pinfo *np = inet6_sk(sk);
695 struct inet6_skb_parm *opt = IP6CB(skb);
696
697 if (np->rxopt.all) {
698 if ((opt->hop && (np->rxopt.bits.hopopts ||
699 np->rxopt.bits.ohopopts)) ||
700 ((IPV6_FLOWINFO_MASK &
701 *(__be32 *)skb_network_header(skb)) &&
702 np->rxopt.bits.rxflow) ||
703 (opt->srcrt && (np->rxopt.bits.srcrt ||
704 np->rxopt.bits.osrcrt)) ||
705 ((opt->dst1 || opt->dst0) &&
706 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
707 return 1;
708 }
709 return 0;
710 }
711
712 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
713
714 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
715 {
716 const struct inet6_protocol *ops = NULL;
717
718 for (;;) {
719 struct ipv6_opt_hdr *opth;
720 int len;
721
722 if (proto != NEXTHDR_HOP) {
723 ops = rcu_dereference(inet6_protos[proto]);
724
725 if (unlikely(!ops))
726 break;
727
728 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
729 break;
730 }
731
732 if (unlikely(!pskb_may_pull(skb, 8)))
733 break;
734
735 opth = (void *)skb->data;
736 len = ipv6_optlen(opth);
737
738 if (unlikely(!pskb_may_pull(skb, len)))
739 break;
740
741 proto = opth->nexthdr;
742 __skb_pull(skb, len);
743 }
744
745 return proto;
746 }
747
748 static int ipv6_gso_send_check(struct sk_buff *skb)
749 {
750 struct ipv6hdr *ipv6h;
751 const struct inet6_protocol *ops;
752 int err = -EINVAL;
753
754 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
755 goto out;
756
757 ipv6h = ipv6_hdr(skb);
758 __skb_pull(skb, sizeof(*ipv6h));
759 err = -EPROTONOSUPPORT;
760
761 rcu_read_lock();
762 ops = rcu_dereference(inet6_protos[
763 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
764
765 if (likely(ops && ops->gso_send_check)) {
766 skb_reset_transport_header(skb);
767 err = ops->gso_send_check(skb);
768 }
769 rcu_read_unlock();
770
771 out:
772 return err;
773 }
774
775 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
776 {
777 struct sk_buff *segs = ERR_PTR(-EINVAL);
778 struct ipv6hdr *ipv6h;
779 const struct inet6_protocol *ops;
780 int proto;
781 struct frag_hdr *fptr;
782 unsigned int unfrag_ip6hlen;
783 u8 *prevhdr;
784 int offset = 0;
785
786 if (!(features & NETIF_F_V6_CSUM))
787 features &= ~NETIF_F_SG;
788
789 if (unlikely(skb_shinfo(skb)->gso_type &
790 ~(SKB_GSO_UDP |
791 SKB_GSO_DODGY |
792 SKB_GSO_TCP_ECN |
793 SKB_GSO_TCPV6 |
794 0)))
795 goto out;
796
797 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
798 goto out;
799
800 ipv6h = ipv6_hdr(skb);
801 __skb_pull(skb, sizeof(*ipv6h));
802 segs = ERR_PTR(-EPROTONOSUPPORT);
803
804 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
805 rcu_read_lock();
806 ops = rcu_dereference(inet6_protos[proto]);
807 if (likely(ops && ops->gso_segment)) {
808 skb_reset_transport_header(skb);
809 segs = ops->gso_segment(skb, features);
810 }
811 rcu_read_unlock();
812
813 if (unlikely(IS_ERR(segs)))
814 goto out;
815
816 for (skb = segs; skb; skb = skb->next) {
817 ipv6h = ipv6_hdr(skb);
818 ipv6h->payload_len = htons(skb->len - skb->mac_len -
819 sizeof(*ipv6h));
820 if (proto == IPPROTO_UDP) {
821 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
822 fptr = (struct frag_hdr *)(skb_network_header(skb) +
823 unfrag_ip6hlen);
824 fptr->frag_off = htons(offset);
825 if (skb->next != NULL)
826 fptr->frag_off |= htons(IP6_MF);
827 offset += (ntohs(ipv6h->payload_len) -
828 sizeof(struct frag_hdr));
829 }
830 }
831
832 out:
833 return segs;
834 }
835
836 struct ipv6_gro_cb {
837 struct napi_gro_cb napi;
838 int proto;
839 };
840
841 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
842
843 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
844 struct sk_buff *skb)
845 {
846 const struct inet6_protocol *ops;
847 struct sk_buff **pp = NULL;
848 struct sk_buff *p;
849 struct ipv6hdr *iph;
850 unsigned int nlen;
851 unsigned int hlen;
852 unsigned int off;
853 int flush = 1;
854 int proto;
855 __wsum csum;
856
857 off = skb_gro_offset(skb);
858 hlen = off + sizeof(*iph);
859 iph = skb_gro_header_fast(skb, off);
860 if (skb_gro_header_hard(skb, hlen)) {
861 iph = skb_gro_header_slow(skb, hlen, off);
862 if (unlikely(!iph))
863 goto out;
864 }
865
866 skb_gro_pull(skb, sizeof(*iph));
867 skb_set_transport_header(skb, skb_gro_offset(skb));
868
869 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
870
871 rcu_read_lock();
872 proto = iph->nexthdr;
873 ops = rcu_dereference(inet6_protos[proto]);
874 if (!ops || !ops->gro_receive) {
875 __pskb_pull(skb, skb_gro_offset(skb));
876 proto = ipv6_gso_pull_exthdrs(skb, proto);
877 skb_gro_pull(skb, -skb_transport_offset(skb));
878 skb_reset_transport_header(skb);
879 __skb_push(skb, skb_gro_offset(skb));
880
881 if (!ops || !ops->gro_receive)
882 goto out_unlock;
883
884 iph = ipv6_hdr(skb);
885 }
886
887 IPV6_GRO_CB(skb)->proto = proto;
888
889 flush--;
890 nlen = skb_network_header_len(skb);
891
892 for (p = *head; p; p = p->next) {
893 struct ipv6hdr *iph2;
894
895 if (!NAPI_GRO_CB(p)->same_flow)
896 continue;
897
898 iph2 = ipv6_hdr(p);
899
900 /* All fields must match except length. */
901 if (nlen != skb_network_header_len(p) ||
902 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
903 memcmp(&iph->nexthdr, &iph2->nexthdr,
904 nlen - offsetof(struct ipv6hdr, nexthdr))) {
905 NAPI_GRO_CB(p)->same_flow = 0;
906 continue;
907 }
908
909 NAPI_GRO_CB(p)->flush |= flush;
910 }
911
912 NAPI_GRO_CB(skb)->flush |= flush;
913
914 csum = skb->csum;
915 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
916
917 pp = ops->gro_receive(head, skb);
918
919 skb->csum = csum;
920
921 out_unlock:
922 rcu_read_unlock();
923
924 out:
925 NAPI_GRO_CB(skb)->flush |= flush;
926
927 return pp;
928 }
929
930 static int ipv6_gro_complete(struct sk_buff *skb)
931 {
932 const struct inet6_protocol *ops;
933 struct ipv6hdr *iph = ipv6_hdr(skb);
934 int err = -ENOSYS;
935
936 iph->payload_len = htons(skb->len - skb_network_offset(skb) -
937 sizeof(*iph));
938
939 rcu_read_lock();
940 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
941 if (WARN_ON(!ops || !ops->gro_complete))
942 goto out_unlock;
943
944 err = ops->gro_complete(skb);
945
946 out_unlock:
947 rcu_read_unlock();
948
949 return err;
950 }
951
952 static struct packet_type ipv6_packet_type __read_mostly = {
953 .type = cpu_to_be16(ETH_P_IPV6),
954 .func = ipv6_rcv,
955 .gso_send_check = ipv6_gso_send_check,
956 .gso_segment = ipv6_gso_segment,
957 .gro_receive = ipv6_gro_receive,
958 .gro_complete = ipv6_gro_complete,
959 };
960
961 static int __init ipv6_packet_init(void)
962 {
963 dev_add_pack(&ipv6_packet_type);
964 return 0;
965 }
966
967 static void ipv6_packet_cleanup(void)
968 {
969 dev_remove_pack(&ipv6_packet_type);
970 }
971
972 static int __net_init ipv6_init_mibs(struct net *net)
973 {
974 if (snmp_mib_init((void **)net->mib.udp_stats_in6,
975 sizeof (struct udp_mib)) < 0)
976 return -ENOMEM;
977 if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
978 sizeof (struct udp_mib)) < 0)
979 goto err_udplite_mib;
980 if (snmp_mib_init((void **)net->mib.ipv6_statistics,
981 sizeof(struct ipstats_mib)) < 0)
982 goto err_ip_mib;
983 if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
984 sizeof(struct icmpv6_mib)) < 0)
985 goto err_icmp_mib;
986 if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
987 sizeof(struct icmpv6msg_mib)) < 0)
988 goto err_icmpmsg_mib;
989 return 0;
990
991 err_icmpmsg_mib:
992 snmp_mib_free((void **)net->mib.icmpv6_statistics);
993 err_icmp_mib:
994 snmp_mib_free((void **)net->mib.ipv6_statistics);
995 err_ip_mib:
996 snmp_mib_free((void **)net->mib.udplite_stats_in6);
997 err_udplite_mib:
998 snmp_mib_free((void **)net->mib.udp_stats_in6);
999 return -ENOMEM;
1000 }
1001
1002 static void ipv6_cleanup_mibs(struct net *net)
1003 {
1004 snmp_mib_free((void **)net->mib.udp_stats_in6);
1005 snmp_mib_free((void **)net->mib.udplite_stats_in6);
1006 snmp_mib_free((void **)net->mib.ipv6_statistics);
1007 snmp_mib_free((void **)net->mib.icmpv6_statistics);
1008 snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
1009 }
1010
1011 static int __net_init inet6_net_init(struct net *net)
1012 {
1013 int err = 0;
1014
1015 net->ipv6.sysctl.bindv6only = 0;
1016 net->ipv6.sysctl.icmpv6_time = 1*HZ;
1017
1018 err = ipv6_init_mibs(net);
1019 if (err)
1020 return err;
1021 #ifdef CONFIG_PROC_FS
1022 err = udp6_proc_init(net);
1023 if (err)
1024 goto out;
1025 err = tcp6_proc_init(net);
1026 if (err)
1027 goto proc_tcp6_fail;
1028 err = ac6_proc_init(net);
1029 if (err)
1030 goto proc_ac6_fail;
1031 #endif
1032 return err;
1033
1034 #ifdef CONFIG_PROC_FS
1035 proc_ac6_fail:
1036 tcp6_proc_exit(net);
1037 proc_tcp6_fail:
1038 udp6_proc_exit(net);
1039 out:
1040 ipv6_cleanup_mibs(net);
1041 return err;
1042 #endif
1043 }
1044
1045 static void __net_exit inet6_net_exit(struct net *net)
1046 {
1047 #ifdef CONFIG_PROC_FS
1048 udp6_proc_exit(net);
1049 tcp6_proc_exit(net);
1050 ac6_proc_exit(net);
1051 #endif
1052 ipv6_cleanup_mibs(net);
1053 }
1054
1055 static struct pernet_operations inet6_net_ops = {
1056 .init = inet6_net_init,
1057 .exit = inet6_net_exit,
1058 };
1059
1060 static int __init inet6_init(void)
1061 {
1062 struct sk_buff *dummy_skb;
1063 struct list_head *r;
1064 int err = 0;
1065
1066 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1067
1068 /* Register the socket-side information for inet6_create. */
1069 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1070 INIT_LIST_HEAD(r);
1071
1072 if (disable_ipv6_mod) {
1073 printk(KERN_INFO
1074 "IPv6: Loaded, but administratively disabled, "
1075 "reboot required to enable\n");
1076 goto out;
1077 }
1078
1079 err = proto_register(&tcpv6_prot, 1);
1080 if (err)
1081 goto out;
1082
1083 err = proto_register(&udpv6_prot, 1);
1084 if (err)
1085 goto out_unregister_tcp_proto;
1086
1087 err = proto_register(&udplitev6_prot, 1);
1088 if (err)
1089 goto out_unregister_udp_proto;
1090
1091 err = proto_register(&rawv6_prot, 1);
1092 if (err)
1093 goto out_unregister_udplite_proto;
1094
1095
1096 /* We MUST register RAW sockets before we create the ICMP6,
1097 * IGMP6, or NDISC control sockets.
1098 */
1099 err = rawv6_init();
1100 if (err)
1101 goto out_unregister_raw_proto;
1102
1103 /* Register the family here so that the init calls below will
1104 * be able to create sockets. (?? is this dangerous ??)
1105 */
1106 err = sock_register(&inet6_family_ops);
1107 if (err)
1108 goto out_sock_register_fail;
1109
1110 #ifdef CONFIG_SYSCTL
1111 err = ipv6_static_sysctl_register();
1112 if (err)
1113 goto static_sysctl_fail;
1114 #endif
1115 /*
1116 * ipngwg API draft makes clear that the correct semantics
1117 * for TCP and UDP is to consider one TCP and UDP instance
1118 * in a host availiable by both INET and INET6 APIs and
1119 * able to communicate via both network protocols.
1120 */
1121
1122 err = register_pernet_subsys(&inet6_net_ops);
1123 if (err)
1124 goto register_pernet_fail;
1125 err = icmpv6_init();
1126 if (err)
1127 goto icmp_fail;
1128 err = ip6_mr_init();
1129 if (err)
1130 goto ipmr_fail;
1131 err = ndisc_init();
1132 if (err)
1133 goto ndisc_fail;
1134 err = igmp6_init();
1135 if (err)
1136 goto igmp_fail;
1137 err = ipv6_netfilter_init();
1138 if (err)
1139 goto netfilter_fail;
1140 /* Create /proc/foo6 entries. */
1141 #ifdef CONFIG_PROC_FS
1142 err = -ENOMEM;
1143 if (raw6_proc_init())
1144 goto proc_raw6_fail;
1145 if (udplite6_proc_init())
1146 goto proc_udplite6_fail;
1147 if (ipv6_misc_proc_init())
1148 goto proc_misc6_fail;
1149 if (if6_proc_init())
1150 goto proc_if6_fail;
1151 #endif
1152 err = ip6_route_init();
1153 if (err)
1154 goto ip6_route_fail;
1155 err = ip6_flowlabel_init();
1156 if (err)
1157 goto ip6_flowlabel_fail;
1158 err = addrconf_init();
1159 if (err)
1160 goto addrconf_fail;
1161
1162 /* Init v6 extension headers. */
1163 err = ipv6_exthdrs_init();
1164 if (err)
1165 goto ipv6_exthdrs_fail;
1166
1167 err = ipv6_frag_init();
1168 if (err)
1169 goto ipv6_frag_fail;
1170
1171 /* Init v6 transport protocols. */
1172 err = udpv6_init();
1173 if (err)
1174 goto udpv6_fail;
1175
1176 err = udplitev6_init();
1177 if (err)
1178 goto udplitev6_fail;
1179
1180 err = tcpv6_init();
1181 if (err)
1182 goto tcpv6_fail;
1183
1184 err = ipv6_packet_init();
1185 if (err)
1186 goto ipv6_packet_fail;
1187
1188 #ifdef CONFIG_SYSCTL
1189 err = ipv6_sysctl_register();
1190 if (err)
1191 goto sysctl_fail;
1192 #endif
1193 out:
1194 return err;
1195
1196 #ifdef CONFIG_SYSCTL
1197 sysctl_fail:
1198 ipv6_packet_cleanup();
1199 #endif
1200 ipv6_packet_fail:
1201 tcpv6_exit();
1202 tcpv6_fail:
1203 udplitev6_exit();
1204 udplitev6_fail:
1205 udpv6_exit();
1206 udpv6_fail:
1207 ipv6_frag_exit();
1208 ipv6_frag_fail:
1209 ipv6_exthdrs_exit();
1210 ipv6_exthdrs_fail:
1211 addrconf_cleanup();
1212 addrconf_fail:
1213 ip6_flowlabel_cleanup();
1214 ip6_flowlabel_fail:
1215 ip6_route_cleanup();
1216 ip6_route_fail:
1217 #ifdef CONFIG_PROC_FS
1218 if6_proc_exit();
1219 proc_if6_fail:
1220 ipv6_misc_proc_exit();
1221 proc_misc6_fail:
1222 udplite6_proc_exit();
1223 proc_udplite6_fail:
1224 raw6_proc_exit();
1225 proc_raw6_fail:
1226 #endif
1227 ipv6_netfilter_fini();
1228 netfilter_fail:
1229 igmp6_cleanup();
1230 igmp_fail:
1231 ndisc_cleanup();
1232 ndisc_fail:
1233 ip6_mr_cleanup();
1234 ipmr_fail:
1235 icmpv6_cleanup();
1236 icmp_fail:
1237 unregister_pernet_subsys(&inet6_net_ops);
1238 register_pernet_fail:
1239 #ifdef CONFIG_SYSCTL
1240 ipv6_static_sysctl_unregister();
1241 static_sysctl_fail:
1242 #endif
1243 sock_unregister(PF_INET6);
1244 rtnl_unregister_all(PF_INET6);
1245 out_sock_register_fail:
1246 rawv6_exit();
1247 out_unregister_raw_proto:
1248 proto_unregister(&rawv6_prot);
1249 out_unregister_udplite_proto:
1250 proto_unregister(&udplitev6_prot);
1251 out_unregister_udp_proto:
1252 proto_unregister(&udpv6_prot);
1253 out_unregister_tcp_proto:
1254 proto_unregister(&tcpv6_prot);
1255 goto out;
1256 }
1257 module_init(inet6_init);
1258
1259 static void __exit inet6_exit(void)
1260 {
1261 if (disable_ipv6_mod)
1262 return;
1263
1264 /* First of all disallow new sockets creation. */
1265 sock_unregister(PF_INET6);
1266 /* Disallow any further netlink messages */
1267 rtnl_unregister_all(PF_INET6);
1268
1269 #ifdef CONFIG_SYSCTL
1270 ipv6_sysctl_unregister();
1271 #endif
1272 udpv6_exit();
1273 udplitev6_exit();
1274 tcpv6_exit();
1275
1276 /* Cleanup code parts. */
1277 ipv6_packet_cleanup();
1278 ipv6_frag_exit();
1279 ipv6_exthdrs_exit();
1280 addrconf_cleanup();
1281 ip6_flowlabel_cleanup();
1282 ip6_route_cleanup();
1283 #ifdef CONFIG_PROC_FS
1284
1285 /* Cleanup code parts. */
1286 if6_proc_exit();
1287 ipv6_misc_proc_exit();
1288 udplite6_proc_exit();
1289 raw6_proc_exit();
1290 #endif
1291 ipv6_netfilter_fini();
1292 igmp6_cleanup();
1293 ndisc_cleanup();
1294 ip6_mr_cleanup();
1295 icmpv6_cleanup();
1296 rawv6_exit();
1297
1298 unregister_pernet_subsys(&inet6_net_ops);
1299 #ifdef CONFIG_SYSCTL
1300 ipv6_static_sysctl_unregister();
1301 #endif
1302 proto_unregister(&rawv6_prot);
1303 proto_unregister(&udplitev6_prot);
1304 proto_unregister(&udpv6_prot);
1305 proto_unregister(&tcpv6_prot);
1306
1307 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1308 }
1309 module_exit(inet6_exit);
1310
1311 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree