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OMAP2/3: Add omap_type() for determining GP/EMU/HS
[linux-ginger.git] / net / ipv6 / af_inet6.c
blob61f55386a236cb7c0ba52f831ebd02a6656c10d7
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 static int disable_ipv6 = 0;
76 module_param_named(disable, disable_ipv6, int, 0);
77 MODULE_PARM_DESC(disable, "Disable IPv6 such that it is non-functional");
78
79 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
80 {
81 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
82
83 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
84 }
85
86 static int inet6_create(struct net *net, struct socket *sock, int protocol)
87 {
88 struct inet_sock *inet;
89 struct ipv6_pinfo *np;
90 struct sock *sk;
91 struct inet_protosw *answer;
92 struct proto *answer_prot;
93 unsigned char answer_flags;
94 char answer_no_check;
95 int try_loading_module = 0;
96 int err;
97
98 if (sock->type != SOCK_RAW &&
99 sock->type != SOCK_DGRAM &&
100 !inet_ehash_secret)
101 build_ehash_secret();
102
103 /* Look for the requested type/protocol pair. */
104 lookup_protocol:
105 err = -ESOCKTNOSUPPORT;
106 rcu_read_lock();
107 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
108
109 err = 0;
110 /* Check the non-wild match. */
111 if (protocol == answer->protocol) {
112 if (protocol != IPPROTO_IP)
113 break;
114 } else {
115 /* Check for the two wild cases. */
116 if (IPPROTO_IP == protocol) {
117 protocol = answer->protocol;
118 break;
119 }
120 if (IPPROTO_IP == answer->protocol)
121 break;
122 }
123 err = -EPROTONOSUPPORT;
124 }
125
126 if (err) {
127 if (try_loading_module < 2) {
128 rcu_read_unlock();
129 /*
130 * Be more specific, e.g. net-pf-10-proto-132-type-1
131 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
132 */
133 if (++try_loading_module == 1)
134 request_module("net-pf-%d-proto-%d-type-%d",
135 PF_INET6, protocol, sock->type);
136 /*
137 * Fall back to generic, e.g. net-pf-10-proto-132
138 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
139 */
140 else
141 request_module("net-pf-%d-proto-%d",
142 PF_INET6, protocol);
143 goto lookup_protocol;
144 } else
145 goto out_rcu_unlock;
146 }
147
148 err = -EPERM;
149 if (answer->capability > 0 && !capable(answer->capability))
150 goto out_rcu_unlock;
151
152 sock->ops = answer->ops;
153 answer_prot = answer->prot;
154 answer_no_check = answer->no_check;
155 answer_flags = answer->flags;
156 rcu_read_unlock();
157
158 WARN_ON(answer_prot->slab == NULL);
159
160 err = -ENOBUFS;
161 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
162 if (sk == NULL)
163 goto out;
164
165 sock_init_data(sock, sk);
166
167 err = 0;
168 sk->sk_no_check = answer_no_check;
169 if (INET_PROTOSW_REUSE & answer_flags)
170 sk->sk_reuse = 1;
171
172 inet = inet_sk(sk);
173 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
174
175 if (SOCK_RAW == sock->type) {
176 inet->num = protocol;
177 if (IPPROTO_RAW == protocol)
178 inet->hdrincl = 1;
179 }
180
181 sk->sk_destruct = inet_sock_destruct;
182 sk->sk_family = PF_INET6;
183 sk->sk_protocol = protocol;
184
185 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
186
187 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
188 np->hop_limit = -1;
189 np->mcast_hops = -1;
190 np->mc_loop = 1;
191 np->pmtudisc = IPV6_PMTUDISC_WANT;
192 np->ipv6only = net->ipv6.sysctl.bindv6only;
193
194 /* Init the ipv4 part of the socket since we can have sockets
195 * using v6 API for ipv4.
196 */
197 inet->uc_ttl = -1;
198
199 inet->mc_loop = 1;
200 inet->mc_ttl = 1;
201 inet->mc_index = 0;
202 inet->mc_list = NULL;
203
204 if (ipv4_config.no_pmtu_disc)
205 inet->pmtudisc = IP_PMTUDISC_DONT;
206 else
207 inet->pmtudisc = IP_PMTUDISC_WANT;
208 /*
209 * Increment only the relevant sk_prot->socks debug field, this changes
210 * the previous behaviour of incrementing both the equivalent to
211 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
212 *
213 * This allows better debug granularity as we'll know exactly how many
214 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
215 * transport protocol socks. -acme
216 */
217 sk_refcnt_debug_inc(sk);
218
219 if (inet->num) {
220 /* It assumes that any protocol which allows
221 * the user to assign a number at socket
222 * creation time automatically shares.
223 */
224 inet->sport = htons(inet->num);
225 sk->sk_prot->hash(sk);
226 }
227 if (sk->sk_prot->init) {
228 err = sk->sk_prot->init(sk);
229 if (err) {
230 sk_common_release(sk);
231 goto out;
232 }
233 }
234 out:
235 return err;
236 out_rcu_unlock:
237 rcu_read_unlock();
238 goto out;
239 }
240
241
242 /* bind for INET6 API */
243 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
244 {
245 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
246 struct sock *sk = sock->sk;
247 struct inet_sock *inet = inet_sk(sk);
248 struct ipv6_pinfo *np = inet6_sk(sk);
249 struct net *net = sock_net(sk);
250 __be32 v4addr = 0;
251 unsigned short snum;
252 int addr_type = 0;
253 int err = 0;
254
255 /* If the socket has its own bind function then use it. */
256 if (sk->sk_prot->bind)
257 return sk->sk_prot->bind(sk, uaddr, addr_len);
258
259 if (addr_len < SIN6_LEN_RFC2133)
260 return -EINVAL;
261 addr_type = ipv6_addr_type(&addr->sin6_addr);
262 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
263 return -EINVAL;
264
265 snum = ntohs(addr->sin6_port);
266 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
267 return -EACCES;
268
269 lock_sock(sk);
270
271 /* Check these errors (active socket, double bind). */
272 if (sk->sk_state != TCP_CLOSE || inet->num) {
273 err = -EINVAL;
274 goto out;
275 }
276
277 /* Check if the address belongs to the host. */
278 if (addr_type == IPV6_ADDR_MAPPED) {
279 int chk_addr_ret;
280
281 /* Binding to v4-mapped address on a v6-only socket
282 * makes no sense
283 */
284 if (np->ipv6only) {
285 err = -EINVAL;
286 goto out;
287 }
288
289 /* Reproduce AF_INET checks to make the bindings consitant */
290 v4addr = addr->sin6_addr.s6_addr32[3];
291 chk_addr_ret = inet_addr_type(net, v4addr);
292 if (!sysctl_ip_nonlocal_bind &&
293 !(inet->freebind || inet->transparent) &&
294 v4addr != htonl(INADDR_ANY) &&
295 chk_addr_ret != RTN_LOCAL &&
296 chk_addr_ret != RTN_MULTICAST &&
297 chk_addr_ret != RTN_BROADCAST)
298 goto out;
299 } else {
300 if (addr_type != IPV6_ADDR_ANY) {
301 struct net_device *dev = NULL;
302
303 if (addr_type & IPV6_ADDR_LINKLOCAL) {
304 if (addr_len >= sizeof(struct sockaddr_in6) &&
305 addr->sin6_scope_id) {
306 /* Override any existing binding, if another one
307 * is supplied by user.
308 */
309 sk->sk_bound_dev_if = addr->sin6_scope_id;
310 }
311
312 /* Binding to link-local address requires an interface */
313 if (!sk->sk_bound_dev_if) {
314 err = -EINVAL;
315 goto out;
316 }
317 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
318 if (!dev) {
319 err = -ENODEV;
320 goto out;
321 }
322 }
323
324 /* ipv4 addr of the socket is invalid. Only the
325 * unspecified and mapped address have a v4 equivalent.
326 */
327 v4addr = LOOPBACK4_IPV6;
328 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
329 if (!ipv6_chk_addr(net, &addr->sin6_addr,
330 dev, 0)) {
331 if (dev)
332 dev_put(dev);
333 err = -EADDRNOTAVAIL;
334 goto out;
335 }
336 }
337 if (dev)
338 dev_put(dev);
339 }
340 }
341
342 inet->rcv_saddr = v4addr;
343 inet->saddr = v4addr;
344
345 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
346
347 if (!(addr_type & IPV6_ADDR_MULTICAST))
348 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
349
350 /* Make sure we are allowed to bind here. */
351 if (sk->sk_prot->get_port(sk, snum)) {
352 inet_reset_saddr(sk);
353 err = -EADDRINUSE;
354 goto out;
355 }
356
357 if (addr_type != IPV6_ADDR_ANY) {
358 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
359 if (addr_type != IPV6_ADDR_MAPPED)
360 np->ipv6only = 1;
361 }
362 if (snum)
363 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
364 inet->sport = htons(inet->num);
365 inet->dport = 0;
366 inet->daddr = 0;
367 out:
368 release_sock(sk);
369 return err;
370 }
371
372 EXPORT_SYMBOL(inet6_bind);
373
374 int inet6_release(struct socket *sock)
375 {
376 struct sock *sk = sock->sk;
377
378 if (sk == NULL)
379 return -EINVAL;
380
381 /* Free mc lists */
382 ipv6_sock_mc_close(sk);
383
384 /* Free ac lists */
385 ipv6_sock_ac_close(sk);
386
387 return inet_release(sock);
388 }
389
390 EXPORT_SYMBOL(inet6_release);
391
392 void inet6_destroy_sock(struct sock *sk)
393 {
394 struct ipv6_pinfo *np = inet6_sk(sk);
395 struct sk_buff *skb;
396 struct ipv6_txoptions *opt;
397
398 /* Release rx options */
399
400 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
401 kfree_skb(skb);
402
403 /* Free flowlabels */
404 fl6_free_socklist(sk);
405
406 /* Free tx options */
407
408 if ((opt = xchg(&np->opt, NULL)) != NULL)
409 sock_kfree_s(sk, opt, opt->tot_len);
410 }
411
412 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
413
414 /*
415 * This does both peername and sockname.
416 */
417
418 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
419 int *uaddr_len, int peer)
420 {
421 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
422 struct sock *sk = sock->sk;
423 struct inet_sock *inet = inet_sk(sk);
424 struct ipv6_pinfo *np = inet6_sk(sk);
425
426 sin->sin6_family = AF_INET6;
427 sin->sin6_flowinfo = 0;
428 sin->sin6_scope_id = 0;
429 if (peer) {
430 if (!inet->dport)
431 return -ENOTCONN;
432 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
433 peer == 1)
434 return -ENOTCONN;
435 sin->sin6_port = inet->dport;
436 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
437 if (np->sndflow)
438 sin->sin6_flowinfo = np->flow_label;
439 } else {
440 if (ipv6_addr_any(&np->rcv_saddr))
441 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
442 else
443 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
444
445 sin->sin6_port = inet->sport;
446 }
447 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
448 sin->sin6_scope_id = sk->sk_bound_dev_if;
449 *uaddr_len = sizeof(*sin);
450 return(0);
451 }
452
453 EXPORT_SYMBOL(inet6_getname);
454
455 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
456 {
457 struct sock *sk = sock->sk;
458 struct net *net = sock_net(sk);
459
460 switch(cmd)
461 {
462 case SIOCGSTAMP:
463 return sock_get_timestamp(sk, (struct timeval __user *)arg);
464
465 case SIOCGSTAMPNS:
466 return sock_get_timestampns(sk, (struct timespec __user *)arg);
467
468 case SIOCADDRT:
469 case SIOCDELRT:
470
471 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
472
473 case SIOCSIFADDR:
474 return addrconf_add_ifaddr(net, (void __user *) arg);
475 case SIOCDIFADDR:
476 return addrconf_del_ifaddr(net, (void __user *) arg);
477 case SIOCSIFDSTADDR:
478 return addrconf_set_dstaddr(net, (void __user *) arg);
479 default:
480 if (!sk->sk_prot->ioctl)
481 return -ENOIOCTLCMD;
482 return sk->sk_prot->ioctl(sk, cmd, arg);
483 }
484 /*NOTREACHED*/
485 return(0);
486 }
487
488 EXPORT_SYMBOL(inet6_ioctl);
489
490 const struct proto_ops inet6_stream_ops = {
491 .family = PF_INET6,
492 .owner = THIS_MODULE,
493 .release = inet6_release,
494 .bind = inet6_bind,
495 .connect = inet_stream_connect, /* ok */
496 .socketpair = sock_no_socketpair, /* a do nothing */
497 .accept = inet_accept, /* ok */
498 .getname = inet6_getname,
499 .poll = tcp_poll, /* ok */
500 .ioctl = inet6_ioctl, /* must change */
501 .listen = inet_listen, /* ok */
502 .shutdown = inet_shutdown, /* ok */
503 .setsockopt = sock_common_setsockopt, /* ok */
504 .getsockopt = sock_common_getsockopt, /* ok */
505 .sendmsg = tcp_sendmsg, /* ok */
506 .recvmsg = sock_common_recvmsg, /* ok */
507 .mmap = sock_no_mmap,
508 .sendpage = tcp_sendpage,
509 .splice_read = tcp_splice_read,
510 #ifdef CONFIG_COMPAT
511 .compat_setsockopt = compat_sock_common_setsockopt,
512 .compat_getsockopt = compat_sock_common_getsockopt,
513 #endif
514 };
515
516 const struct proto_ops inet6_dgram_ops = {
517 .family = PF_INET6,
518 .owner = THIS_MODULE,
519 .release = inet6_release,
520 .bind = inet6_bind,
521 .connect = inet_dgram_connect, /* ok */
522 .socketpair = sock_no_socketpair, /* a do nothing */
523 .accept = sock_no_accept, /* a do nothing */
524 .getname = inet6_getname,
525 .poll = udp_poll, /* ok */
526 .ioctl = inet6_ioctl, /* must change */
527 .listen = sock_no_listen, /* ok */
528 .shutdown = inet_shutdown, /* ok */
529 .setsockopt = sock_common_setsockopt, /* ok */
530 .getsockopt = sock_common_getsockopt, /* ok */
531 .sendmsg = inet_sendmsg, /* ok */
532 .recvmsg = sock_common_recvmsg, /* ok */
533 .mmap = sock_no_mmap,
534 .sendpage = sock_no_sendpage,
535 #ifdef CONFIG_COMPAT
536 .compat_setsockopt = compat_sock_common_setsockopt,
537 .compat_getsockopt = compat_sock_common_getsockopt,
538 #endif
539 };
540
541 static struct net_proto_family inet6_family_ops = {
542 .family = PF_INET6,
543 .create = inet6_create,
544 .owner = THIS_MODULE,
545 };
546
547 int inet6_register_protosw(struct inet_protosw *p)
548 {
549 struct list_head *lh;
550 struct inet_protosw *answer;
551 struct list_head *last_perm;
552 int protocol = p->protocol;
553 int ret;
554
555 spin_lock_bh(&inetsw6_lock);
556
557 ret = -EINVAL;
558 if (p->type >= SOCK_MAX)
559 goto out_illegal;
560
561 /* If we are trying to override a permanent protocol, bail. */
562 answer = NULL;
563 ret = -EPERM;
564 last_perm = &inetsw6[p->type];
565 list_for_each(lh, &inetsw6[p->type]) {
566 answer = list_entry(lh, struct inet_protosw, list);
567
568 /* Check only the non-wild match. */
569 if (INET_PROTOSW_PERMANENT & answer->flags) {
570 if (protocol == answer->protocol)
571 break;
572 last_perm = lh;
573 }
574
575 answer = NULL;
576 }
577 if (answer)
578 goto out_permanent;
579
580 /* Add the new entry after the last permanent entry if any, so that
581 * the new entry does not override a permanent entry when matched with
582 * a wild-card protocol. But it is allowed to override any existing
583 * non-permanent entry. This means that when we remove this entry, the
584 * system automatically returns to the old behavior.
585 */
586 list_add_rcu(&p->list, last_perm);
587 ret = 0;
588 out:
589 spin_unlock_bh(&inetsw6_lock);
590 return ret;
591
592 out_permanent:
593 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
594 protocol);
595 goto out;
596
597 out_illegal:
598 printk(KERN_ERR
599 "Ignoring attempt to register invalid socket type %d.\n",
600 p->type);
601 goto out;
602 }
603
604 EXPORT_SYMBOL(inet6_register_protosw);
605
606 void
607 inet6_unregister_protosw(struct inet_protosw *p)
608 {
609 if (INET_PROTOSW_PERMANENT & p->flags) {
610 printk(KERN_ERR
611 "Attempt to unregister permanent protocol %d.\n",
612 p->protocol);
613 } else {
614 spin_lock_bh(&inetsw6_lock);
615 list_del_rcu(&p->list);
616 spin_unlock_bh(&inetsw6_lock);
617
618 synchronize_net();
619 }
620 }
621
622 EXPORT_SYMBOL(inet6_unregister_protosw);
623
624 int inet6_sk_rebuild_header(struct sock *sk)
625 {
626 int err;
627 struct dst_entry *dst;
628 struct ipv6_pinfo *np = inet6_sk(sk);
629
630 dst = __sk_dst_check(sk, np->dst_cookie);
631
632 if (dst == NULL) {
633 struct inet_sock *inet = inet_sk(sk);
634 struct in6_addr *final_p = NULL, final;
635 struct flowi fl;
636
637 memset(&fl, 0, sizeof(fl));
638 fl.proto = sk->sk_protocol;
639 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
640 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
641 fl.fl6_flowlabel = np->flow_label;
642 fl.oif = sk->sk_bound_dev_if;
643 fl.fl_ip_dport = inet->dport;
644 fl.fl_ip_sport = inet->sport;
645 security_sk_classify_flow(sk, &fl);
646
647 if (np->opt && np->opt->srcrt) {
648 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
649 ipv6_addr_copy(&final, &fl.fl6_dst);
650 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
651 final_p = &final;
652 }
653
654 err = ip6_dst_lookup(sk, &dst, &fl);
655 if (err) {
656 sk->sk_route_caps = 0;
657 return err;
658 }
659 if (final_p)
660 ipv6_addr_copy(&fl.fl6_dst, final_p);
661
662 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
663 sk->sk_err_soft = -err;
664 return err;
665 }
666
667 __ip6_dst_store(sk, dst, NULL, NULL);
668 }
669
670 return 0;
671 }
672
673 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
674
675 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
676 {
677 struct ipv6_pinfo *np = inet6_sk(sk);
678 struct inet6_skb_parm *opt = IP6CB(skb);
679
680 if (np->rxopt.all) {
681 if ((opt->hop && (np->rxopt.bits.hopopts ||
682 np->rxopt.bits.ohopopts)) ||
683 ((IPV6_FLOWINFO_MASK &
684 *(__be32 *)skb_network_header(skb)) &&
685 np->rxopt.bits.rxflow) ||
686 (opt->srcrt && (np->rxopt.bits.srcrt ||
687 np->rxopt.bits.osrcrt)) ||
688 ((opt->dst1 || opt->dst0) &&
689 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
690 return 1;
691 }
692 return 0;
693 }
694
695 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
696
697 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
698 {
699 struct inet6_protocol *ops = NULL;
700
701 for (;;) {
702 struct ipv6_opt_hdr *opth;
703 int len;
704
705 if (proto != NEXTHDR_HOP) {
706 ops = rcu_dereference(inet6_protos[proto]);
707
708 if (unlikely(!ops))
709 break;
710
711 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
712 break;
713 }
714
715 if (unlikely(!pskb_may_pull(skb, 8)))
716 break;
717
718 opth = (void *)skb->data;
719 len = ipv6_optlen(opth);
720
721 if (unlikely(!pskb_may_pull(skb, len)))
722 break;
723
724 proto = opth->nexthdr;
725 __skb_pull(skb, len);
726 }
727
728 return proto;
729 }
730
731 static int ipv6_gso_send_check(struct sk_buff *skb)
732 {
733 struct ipv6hdr *ipv6h;
734 struct inet6_protocol *ops;
735 int err = -EINVAL;
736
737 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
738 goto out;
739
740 ipv6h = ipv6_hdr(skb);
741 __skb_pull(skb, sizeof(*ipv6h));
742 err = -EPROTONOSUPPORT;
743
744 rcu_read_lock();
745 ops = rcu_dereference(inet6_protos[
746 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
747
748 if (likely(ops && ops->gso_send_check)) {
749 skb_reset_transport_header(skb);
750 err = ops->gso_send_check(skb);
751 }
752 rcu_read_unlock();
753
754 out:
755 return err;
756 }
757
758 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
759 {
760 struct sk_buff *segs = ERR_PTR(-EINVAL);
761 struct ipv6hdr *ipv6h;
762 struct inet6_protocol *ops;
763
764 if (!(features & NETIF_F_V6_CSUM))
765 features &= ~NETIF_F_SG;
766
767 if (unlikely(skb_shinfo(skb)->gso_type &
768 ~(SKB_GSO_UDP |
769 SKB_GSO_DODGY |
770 SKB_GSO_TCP_ECN |
771 SKB_GSO_TCPV6 |
772 0)))
773 goto out;
774
775 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
776 goto out;
777
778 ipv6h = ipv6_hdr(skb);
779 __skb_pull(skb, sizeof(*ipv6h));
780 segs = ERR_PTR(-EPROTONOSUPPORT);
781
782 rcu_read_lock();
783 ops = rcu_dereference(inet6_protos[
784 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
785
786 if (likely(ops && ops->gso_segment)) {
787 skb_reset_transport_header(skb);
788 segs = ops->gso_segment(skb, features);
789 }
790 rcu_read_unlock();
791
792 if (unlikely(IS_ERR(segs)))
793 goto out;
794
795 for (skb = segs; skb; skb = skb->next) {
796 ipv6h = ipv6_hdr(skb);
797 ipv6h->payload_len = htons(skb->len - skb->mac_len -
798 sizeof(*ipv6h));
799 }
800
801 out:
802 return segs;
803 }
804
805 struct ipv6_gro_cb {
806 struct napi_gro_cb napi;
807 int proto;
808 };
809
810 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
811
812 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
813 struct sk_buff *skb)
814 {
815 struct inet6_protocol *ops;
816 struct sk_buff **pp = NULL;
817 struct sk_buff *p;
818 struct ipv6hdr *iph;
819 unsigned int nlen;
820 int flush = 1;
821 int proto;
822 __wsum csum;
823
824 iph = skb_gro_header(skb, sizeof(*iph));
825 if (unlikely(!iph))
826 goto out;
827
828 skb_gro_pull(skb, sizeof(*iph));
829 skb_set_transport_header(skb, skb_gro_offset(skb));
830
831 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
832
833 rcu_read_lock();
834 proto = iph->nexthdr;
835 ops = rcu_dereference(inet6_protos[proto]);
836 if (!ops || !ops->gro_receive) {
837 __pskb_pull(skb, skb_gro_offset(skb));
838 proto = ipv6_gso_pull_exthdrs(skb, proto);
839 skb_gro_pull(skb, -skb_transport_offset(skb));
840 skb_reset_transport_header(skb);
841 __skb_push(skb, skb_gro_offset(skb));
842
843 if (!ops || !ops->gro_receive)
844 goto out_unlock;
845
846 iph = ipv6_hdr(skb);
847 }
848
849 IPV6_GRO_CB(skb)->proto = proto;
850
851 flush--;
852 nlen = skb_network_header_len(skb);
853
854 for (p = *head; p; p = p->next) {
855 struct ipv6hdr *iph2;
856
857 if (!NAPI_GRO_CB(p)->same_flow)
858 continue;
859
860 iph2 = ipv6_hdr(p);
861
862 /* All fields must match except length. */
863 if (nlen != skb_network_header_len(p) ||
864 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
865 memcmp(&iph->nexthdr, &iph2->nexthdr,
866 nlen - offsetof(struct ipv6hdr, nexthdr))) {
867 NAPI_GRO_CB(p)->same_flow = 0;
868 continue;
869 }
870
871 NAPI_GRO_CB(p)->flush |= flush;
872 }
873
874 NAPI_GRO_CB(skb)->flush |= flush;
875
876 csum = skb->csum;
877 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
878
879 pp = ops->gro_receive(head, skb);
880
881 skb->csum = csum;
882
883 out_unlock:
884 rcu_read_unlock();
885
886 out:
887 NAPI_GRO_CB(skb)->flush |= flush;
888
889 return pp;
890 }
891
892 static int ipv6_gro_complete(struct sk_buff *skb)
893 {
894 struct inet6_protocol *ops;
895 struct ipv6hdr *iph = ipv6_hdr(skb);
896 int err = -ENOSYS;
897
898 iph->payload_len = htons(skb->len - skb_network_offset(skb) -
899 sizeof(*iph));
900
901 rcu_read_lock();
902 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
903 if (WARN_ON(!ops || !ops->gro_complete))
904 goto out_unlock;
905
906 err = ops->gro_complete(skb);
907
908 out_unlock:
909 rcu_read_unlock();
910
911 return err;
912 }
913
914 static struct packet_type ipv6_packet_type __read_mostly = {
915 .type = cpu_to_be16(ETH_P_IPV6),
916 .func = ipv6_rcv,
917 .gso_send_check = ipv6_gso_send_check,
918 .gso_segment = ipv6_gso_segment,
919 .gro_receive = ipv6_gro_receive,
920 .gro_complete = ipv6_gro_complete,
921 };
922
923 static int __init ipv6_packet_init(void)
924 {
925 dev_add_pack(&ipv6_packet_type);
926 return 0;
927 }
928
929 static void ipv6_packet_cleanup(void)
930 {
931 dev_remove_pack(&ipv6_packet_type);
932 }
933
934 static int __net_init ipv6_init_mibs(struct net *net)
935 {
936 if (snmp_mib_init((void **)net->mib.udp_stats_in6,
937 sizeof (struct udp_mib)) < 0)
938 return -ENOMEM;
939 if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
940 sizeof (struct udp_mib)) < 0)
941 goto err_udplite_mib;
942 if (snmp_mib_init((void **)net->mib.ipv6_statistics,
943 sizeof(struct ipstats_mib)) < 0)
944 goto err_ip_mib;
945 if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
946 sizeof(struct icmpv6_mib)) < 0)
947 goto err_icmp_mib;
948 if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
949 sizeof(struct icmpv6msg_mib)) < 0)
950 goto err_icmpmsg_mib;
951 return 0;
952
953 err_icmpmsg_mib:
954 snmp_mib_free((void **)net->mib.icmpv6_statistics);
955 err_icmp_mib:
956 snmp_mib_free((void **)net->mib.ipv6_statistics);
957 err_ip_mib:
958 snmp_mib_free((void **)net->mib.udplite_stats_in6);
959 err_udplite_mib:
960 snmp_mib_free((void **)net->mib.udp_stats_in6);
961 return -ENOMEM;
962 }
963
964 static void __net_exit ipv6_cleanup_mibs(struct net *net)
965 {
966 snmp_mib_free((void **)net->mib.udp_stats_in6);
967 snmp_mib_free((void **)net->mib.udplite_stats_in6);
968 snmp_mib_free((void **)net->mib.ipv6_statistics);
969 snmp_mib_free((void **)net->mib.icmpv6_statistics);
970 snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
971 }
972
973 static int __net_init inet6_net_init(struct net *net)
974 {
975 int err = 0;
976
977 net->ipv6.sysctl.bindv6only = 0;
978 net->ipv6.sysctl.icmpv6_time = 1*HZ;
979
980 err = ipv6_init_mibs(net);
981 if (err)
982 return err;
983 #ifdef CONFIG_PROC_FS
984 err = udp6_proc_init(net);
985 if (err)
986 goto out;
987 err = tcp6_proc_init(net);
988 if (err)
989 goto proc_tcp6_fail;
990 err = ac6_proc_init(net);
991 if (err)
992 goto proc_ac6_fail;
993 #endif
994 return err;
995
996 #ifdef CONFIG_PROC_FS
997 proc_ac6_fail:
998 tcp6_proc_exit(net);
999 proc_tcp6_fail:
1000 udp6_proc_exit(net);
1001 out:
1002 ipv6_cleanup_mibs(net);
1003 return err;
1004 #endif
1005 }
1006
1007 static void inet6_net_exit(struct net *net)
1008 {
1009 #ifdef CONFIG_PROC_FS
1010 udp6_proc_exit(net);
1011 tcp6_proc_exit(net);
1012 ac6_proc_exit(net);
1013 #endif
1014 ipv6_cleanup_mibs(net);
1015 }
1016
1017 static struct pernet_operations inet6_net_ops = {
1018 .init = inet6_net_init,
1019 .exit = inet6_net_exit,
1020 };
1021
1022 static int __init inet6_init(void)
1023 {
1024 struct sk_buff *dummy_skb;
1025 struct list_head *r;
1026 int err = 0;
1027
1028 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1029
1030 /* Register the socket-side information for inet6_create. */
1031 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1032 INIT_LIST_HEAD(r);
1033
1034 if (disable_ipv6) {
1035 printk(KERN_INFO
1036 "IPv6: Loaded, but administratively disabled, "
1037 "reboot required to enable\n");
1038 goto out;
1039 }
1040
1041 err = proto_register(&tcpv6_prot, 1);
1042 if (err)
1043 goto out;
1044
1045 err = proto_register(&udpv6_prot, 1);
1046 if (err)
1047 goto out_unregister_tcp_proto;
1048
1049 err = proto_register(&udplitev6_prot, 1);
1050 if (err)
1051 goto out_unregister_udp_proto;
1052
1053 err = proto_register(&rawv6_prot, 1);
1054 if (err)
1055 goto out_unregister_udplite_proto;
1056
1057
1058 /* We MUST register RAW sockets before we create the ICMP6,
1059 * IGMP6, or NDISC control sockets.
1060 */
1061 err = rawv6_init();
1062 if (err)
1063 goto out_unregister_raw_proto;
1064
1065 /* Register the family here so that the init calls below will
1066 * be able to create sockets. (?? is this dangerous ??)
1067 */
1068 err = sock_register(&inet6_family_ops);
1069 if (err)
1070 goto out_sock_register_fail;
1071
1072 #ifdef CONFIG_SYSCTL
1073 err = ipv6_static_sysctl_register();
1074 if (err)
1075 goto static_sysctl_fail;
1076 #endif
1077 /*
1078 * ipngwg API draft makes clear that the correct semantics
1079 * for TCP and UDP is to consider one TCP and UDP instance
1080 * in a host availiable by both INET and INET6 APIs and
1081 * able to communicate via both network protocols.
1082 */
1083
1084 err = register_pernet_subsys(&inet6_net_ops);
1085 if (err)
1086 goto register_pernet_fail;
1087 err = icmpv6_init();
1088 if (err)
1089 goto icmp_fail;
1090 err = ip6_mr_init();
1091 if (err)
1092 goto ipmr_fail;
1093 err = ndisc_init();
1094 if (err)
1095 goto ndisc_fail;
1096 err = igmp6_init();
1097 if (err)
1098 goto igmp_fail;
1099 err = ipv6_netfilter_init();
1100 if (err)
1101 goto netfilter_fail;
1102 /* Create /proc/foo6 entries. */
1103 #ifdef CONFIG_PROC_FS
1104 err = -ENOMEM;
1105 if (raw6_proc_init())
1106 goto proc_raw6_fail;
1107 if (udplite6_proc_init())
1108 goto proc_udplite6_fail;
1109 if (ipv6_misc_proc_init())
1110 goto proc_misc6_fail;
1111 if (if6_proc_init())
1112 goto proc_if6_fail;
1113 #endif
1114 err = ip6_route_init();
1115 if (err)
1116 goto ip6_route_fail;
1117 err = ip6_flowlabel_init();
1118 if (err)
1119 goto ip6_flowlabel_fail;
1120 err = addrconf_init();
1121 if (err)
1122 goto addrconf_fail;
1123
1124 /* Init v6 extension headers. */
1125 err = ipv6_exthdrs_init();
1126 if (err)
1127 goto ipv6_exthdrs_fail;
1128
1129 err = ipv6_frag_init();
1130 if (err)
1131 goto ipv6_frag_fail;
1132
1133 /* Init v6 transport protocols. */
1134 err = udpv6_init();
1135 if (err)
1136 goto udpv6_fail;
1137
1138 err = udplitev6_init();
1139 if (err)
1140 goto udplitev6_fail;
1141
1142 err = tcpv6_init();
1143 if (err)
1144 goto tcpv6_fail;
1145
1146 err = ipv6_packet_init();
1147 if (err)
1148 goto ipv6_packet_fail;
1149
1150 #ifdef CONFIG_SYSCTL
1151 err = ipv6_sysctl_register();
1152 if (err)
1153 goto sysctl_fail;
1154 #endif
1155 out:
1156 return err;
1157
1158 #ifdef CONFIG_SYSCTL
1159 sysctl_fail:
1160 ipv6_packet_cleanup();
1161 #endif
1162 ipv6_packet_fail:
1163 tcpv6_exit();
1164 tcpv6_fail:
1165 udplitev6_exit();
1166 udplitev6_fail:
1167 udpv6_exit();
1168 udpv6_fail:
1169 ipv6_frag_exit();
1170 ipv6_frag_fail:
1171 ipv6_exthdrs_exit();
1172 ipv6_exthdrs_fail:
1173 addrconf_cleanup();
1174 addrconf_fail:
1175 ip6_flowlabel_cleanup();
1176 ip6_flowlabel_fail:
1177 ip6_route_cleanup();
1178 ip6_route_fail:
1179 #ifdef CONFIG_PROC_FS
1180 if6_proc_exit();
1181 proc_if6_fail:
1182 ipv6_misc_proc_exit();
1183 proc_misc6_fail:
1184 udplite6_proc_exit();
1185 proc_udplite6_fail:
1186 raw6_proc_exit();
1187 proc_raw6_fail:
1188 #endif
1189 ipv6_netfilter_fini();
1190 netfilter_fail:
1191 igmp6_cleanup();
1192 igmp_fail:
1193 ndisc_cleanup();
1194 ndisc_fail:
1195 ip6_mr_cleanup();
1196 ipmr_fail:
1197 icmpv6_cleanup();
1198 icmp_fail:
1199 unregister_pernet_subsys(&inet6_net_ops);
1200 register_pernet_fail:
1201 #ifdef CONFIG_SYSCTL
1202 ipv6_static_sysctl_unregister();
1203 static_sysctl_fail:
1204 #endif
1205 sock_unregister(PF_INET6);
1206 rtnl_unregister_all(PF_INET6);
1207 out_sock_register_fail:
1208 rawv6_exit();
1209 out_unregister_raw_proto:
1210 proto_unregister(&rawv6_prot);
1211 out_unregister_udplite_proto:
1212 proto_unregister(&udplitev6_prot);
1213 out_unregister_udp_proto:
1214 proto_unregister(&udpv6_prot);
1215 out_unregister_tcp_proto:
1216 proto_unregister(&tcpv6_prot);
1217 goto out;
1218 }
1219 module_init(inet6_init);
1220
1221 static void __exit inet6_exit(void)
1222 {
1223 if (disable_ipv6)
1224 return;
1225
1226 /* First of all disallow new sockets creation. */
1227 sock_unregister(PF_INET6);
1228 /* Disallow any further netlink messages */
1229 rtnl_unregister_all(PF_INET6);
1230
1231 #ifdef CONFIG_SYSCTL
1232 ipv6_sysctl_unregister();
1233 #endif
1234 udpv6_exit();
1235 udplitev6_exit();
1236 tcpv6_exit();
1237
1238 /* Cleanup code parts. */
1239 ipv6_packet_cleanup();
1240 ipv6_frag_exit();
1241 ipv6_exthdrs_exit();
1242 addrconf_cleanup();
1243 ip6_flowlabel_cleanup();
1244 ip6_route_cleanup();
1245 #ifdef CONFIG_PROC_FS
1246
1247 /* Cleanup code parts. */
1248 if6_proc_exit();
1249 ipv6_misc_proc_exit();
1250 udplite6_proc_exit();
1251 raw6_proc_exit();
1252 #endif
1253 ipv6_netfilter_fini();
1254 igmp6_cleanup();
1255 ndisc_cleanup();
1256 ip6_mr_cleanup();
1257 icmpv6_cleanup();
1258 rawv6_exit();
1259
1260 unregister_pernet_subsys(&inet6_net_ops);
1261 #ifdef CONFIG_SYSCTL
1262 ipv6_static_sysctl_unregister();
1263 #endif
1264 proto_unregister(&rawv6_prot);
1265 proto_unregister(&udplitev6_prot);
1266 proto_unregister(&udpv6_prot);
1267 proto_unregister(&tcpv6_prot);
1268 }
1269 module_exit(inet6_exit);
1270
1271 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux for Ginger Game Console