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net: remove k{un}map_skb_frag()
[deliverable/linux.git] / net / ipv6 / af_inet6.c
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 inet->rcv_tos = 0;
218
219 if (ipv4_config.no_pmtu_disc)
220 inet->pmtudisc = IP_PMTUDISC_DONT;
221 else
222 inet->pmtudisc = IP_PMTUDISC_WANT;
223 /*
224 * Increment only the relevant sk_prot->socks debug field, this changes
225 * the previous behaviour of incrementing both the equivalent to
226 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
227 *
228 * This allows better debug granularity as we'll know exactly how many
229 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
230 * transport protocol socks. -acme
231 */
232 sk_refcnt_debug_inc(sk);
233
234 if (inet->inet_num) {
235 /* It assumes that any protocol which allows
236 * the user to assign a number at socket
237 * creation time automatically shares.
238 */
239 inet->inet_sport = htons(inet->inet_num);
240 sk->sk_prot->hash(sk);
241 }
242 if (sk->sk_prot->init) {
243 err = sk->sk_prot->init(sk);
244 if (err) {
245 sk_common_release(sk);
246 goto out;
247 }
248 }
249 out:
250 return err;
251 out_rcu_unlock:
252 rcu_read_unlock();
253 goto out;
254 }
255
256
257 /* bind for INET6 API */
258 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
259 {
260 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
261 struct sock *sk = sock->sk;
262 struct inet_sock *inet = inet_sk(sk);
263 struct ipv6_pinfo *np = inet6_sk(sk);
264 struct net *net = sock_net(sk);
265 __be32 v4addr = 0;
266 unsigned short snum;
267 int addr_type = 0;
268 int err = 0;
269
270 /* If the socket has its own bind function then use it. */
271 if (sk->sk_prot->bind)
272 return sk->sk_prot->bind(sk, uaddr, addr_len);
273
274 if (addr_len < SIN6_LEN_RFC2133)
275 return -EINVAL;
276
277 if (addr->sin6_family != AF_INET6)
278 return -EAFNOSUPPORT;
279
280 addr_type = ipv6_addr_type(&addr->sin6_addr);
281 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
282 return -EINVAL;
283
284 snum = ntohs(addr->sin6_port);
285 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
286 return -EACCES;
287
288 lock_sock(sk);
289
290 /* Check these errors (active socket, double bind). */
291 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
292 err = -EINVAL;
293 goto out;
294 }
295
296 /* Check if the address belongs to the host. */
297 if (addr_type == IPV6_ADDR_MAPPED) {
298 int chk_addr_ret;
299
300 /* Binding to v4-mapped address on a v6-only socket
301 * makes no sense
302 */
303 if (np->ipv6only) {
304 err = -EINVAL;
305 goto out;
306 }
307
308 /* Reproduce AF_INET checks to make the bindings consistent */
309 v4addr = addr->sin6_addr.s6_addr32[3];
310 chk_addr_ret = inet_addr_type(net, v4addr);
311 if (!sysctl_ip_nonlocal_bind &&
312 !(inet->freebind || inet->transparent) &&
313 v4addr != htonl(INADDR_ANY) &&
314 chk_addr_ret != RTN_LOCAL &&
315 chk_addr_ret != RTN_MULTICAST &&
316 chk_addr_ret != RTN_BROADCAST) {
317 err = -EADDRNOTAVAIL;
318 goto out;
319 }
320 } else {
321 if (addr_type != IPV6_ADDR_ANY) {
322 struct net_device *dev = NULL;
323
324 rcu_read_lock();
325 if (addr_type & IPV6_ADDR_LINKLOCAL) {
326 if (addr_len >= sizeof(struct sockaddr_in6) &&
327 addr->sin6_scope_id) {
328 /* Override any existing binding, if another one
329 * is supplied by user.
330 */
331 sk->sk_bound_dev_if = addr->sin6_scope_id;
332 }
333
334 /* Binding to link-local address requires an interface */
335 if (!sk->sk_bound_dev_if) {
336 err = -EINVAL;
337 goto out_unlock;
338 }
339 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
340 if (!dev) {
341 err = -ENODEV;
342 goto out_unlock;
343 }
344 }
345
346 /* ipv4 addr of the socket is invalid. Only the
347 * unspecified and mapped address have a v4 equivalent.
348 */
349 v4addr = LOOPBACK4_IPV6;
350 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
351 if (!(inet->freebind || inet->transparent) &&
352 !ipv6_chk_addr(net, &addr->sin6_addr,
353 dev, 0)) {
354 err = -EADDRNOTAVAIL;
355 goto out_unlock;
356 }
357 }
358 rcu_read_unlock();
359 }
360 }
361
362 inet->inet_rcv_saddr = v4addr;
363 inet->inet_saddr = v4addr;
364
365 np->rcv_saddr = addr->sin6_addr;
366
367 if (!(addr_type & IPV6_ADDR_MULTICAST))
368 np->saddr = addr->sin6_addr;
369
370 /* Make sure we are allowed to bind here. */
371 if (sk->sk_prot->get_port(sk, snum)) {
372 inet_reset_saddr(sk);
373 err = -EADDRINUSE;
374 goto out;
375 }
376
377 if (addr_type != IPV6_ADDR_ANY) {
378 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
379 if (addr_type != IPV6_ADDR_MAPPED)
380 np->ipv6only = 1;
381 }
382 if (snum)
383 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
384 inet->inet_sport = htons(inet->inet_num);
385 inet->inet_dport = 0;
386 inet->inet_daddr = 0;
387 out:
388 release_sock(sk);
389 return err;
390 out_unlock:
391 rcu_read_unlock();
392 goto out;
393 }
394
395 EXPORT_SYMBOL(inet6_bind);
396
397 int inet6_release(struct socket *sock)
398 {
399 struct sock *sk = sock->sk;
400
401 if (sk == NULL)
402 return -EINVAL;
403
404 /* Free mc lists */
405 ipv6_sock_mc_close(sk);
406
407 /* Free ac lists */
408 ipv6_sock_ac_close(sk);
409
410 return inet_release(sock);
411 }
412
413 EXPORT_SYMBOL(inet6_release);
414
415 void inet6_destroy_sock(struct sock *sk)
416 {
417 struct ipv6_pinfo *np = inet6_sk(sk);
418 struct sk_buff *skb;
419 struct ipv6_txoptions *opt;
420
421 /* Release rx options */
422
423 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
424 kfree_skb(skb);
425
426 if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
427 kfree_skb(skb);
428
429 /* Free flowlabels */
430 fl6_free_socklist(sk);
431
432 /* Free tx options */
433
434 if ((opt = xchg(&np->opt, NULL)) != NULL)
435 sock_kfree_s(sk, opt, opt->tot_len);
436 }
437
438 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
439
440 /*
441 * This does both peername and sockname.
442 */
443
444 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
445 int *uaddr_len, int peer)
446 {
447 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
448 struct sock *sk = sock->sk;
449 struct inet_sock *inet = inet_sk(sk);
450 struct ipv6_pinfo *np = inet6_sk(sk);
451
452 sin->sin6_family = AF_INET6;
453 sin->sin6_flowinfo = 0;
454 sin->sin6_scope_id = 0;
455 if (peer) {
456 if (!inet->inet_dport)
457 return -ENOTCONN;
458 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
459 peer == 1)
460 return -ENOTCONN;
461 sin->sin6_port = inet->inet_dport;
462 sin->sin6_addr = np->daddr;
463 if (np->sndflow)
464 sin->sin6_flowinfo = np->flow_label;
465 } else {
466 if (ipv6_addr_any(&np->rcv_saddr))
467 sin->sin6_addr = np->saddr;
468 else
469 sin->sin6_addr = np->rcv_saddr;
470
471 sin->sin6_port = inet->inet_sport;
472 }
473 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
474 sin->sin6_scope_id = sk->sk_bound_dev_if;
475 *uaddr_len = sizeof(*sin);
476 return 0;
477 }
478
479 EXPORT_SYMBOL(inet6_getname);
480
481 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
482 {
483 struct sock *sk = sock->sk;
484 struct net *net = sock_net(sk);
485
486 switch(cmd)
487 {
488 case SIOCGSTAMP:
489 return sock_get_timestamp(sk, (struct timeval __user *)arg);
490
491 case SIOCGSTAMPNS:
492 return sock_get_timestampns(sk, (struct timespec __user *)arg);
493
494 case SIOCADDRT:
495 case SIOCDELRT:
496
497 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
498
499 case SIOCSIFADDR:
500 return addrconf_add_ifaddr(net, (void __user *) arg);
501 case SIOCDIFADDR:
502 return addrconf_del_ifaddr(net, (void __user *) arg);
503 case SIOCSIFDSTADDR:
504 return addrconf_set_dstaddr(net, (void __user *) arg);
505 default:
506 if (!sk->sk_prot->ioctl)
507 return -ENOIOCTLCMD;
508 return sk->sk_prot->ioctl(sk, cmd, arg);
509 }
510 /*NOTREACHED*/
511 return 0;
512 }
513
514 EXPORT_SYMBOL(inet6_ioctl);
515
516 const struct proto_ops inet6_stream_ops = {
517 .family = PF_INET6,
518 .owner = THIS_MODULE,
519 .release = inet6_release,
520 .bind = inet6_bind,
521 .connect = inet_stream_connect, /* ok */
522 .socketpair = sock_no_socketpair, /* a do nothing */
523 .accept = inet_accept, /* ok */
524 .getname = inet6_getname,
525 .poll = tcp_poll, /* ok */
526 .ioctl = inet6_ioctl, /* must change */
527 .listen = inet_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 = inet_recvmsg, /* ok */
533 .mmap = sock_no_mmap,
534 .sendpage = inet_sendpage,
535 .splice_read = tcp_splice_read,
536 #ifdef CONFIG_COMPAT
537 .compat_setsockopt = compat_sock_common_setsockopt,
538 .compat_getsockopt = compat_sock_common_getsockopt,
539 #endif
540 };
541
542 const struct proto_ops inet6_dgram_ops = {
543 .family = PF_INET6,
544 .owner = THIS_MODULE,
545 .release = inet6_release,
546 .bind = inet6_bind,
547 .connect = inet_dgram_connect, /* ok */
548 .socketpair = sock_no_socketpair, /* a do nothing */
549 .accept = sock_no_accept, /* a do nothing */
550 .getname = inet6_getname,
551 .poll = udp_poll, /* ok */
552 .ioctl = inet6_ioctl, /* must change */
553 .listen = sock_no_listen, /* ok */
554 .shutdown = inet_shutdown, /* ok */
555 .setsockopt = sock_common_setsockopt, /* ok */
556 .getsockopt = sock_common_getsockopt, /* ok */
557 .sendmsg = inet_sendmsg, /* ok */
558 .recvmsg = inet_recvmsg, /* ok */
559 .mmap = sock_no_mmap,
560 .sendpage = sock_no_sendpage,
561 #ifdef CONFIG_COMPAT
562 .compat_setsockopt = compat_sock_common_setsockopt,
563 .compat_getsockopt = compat_sock_common_getsockopt,
564 #endif
565 };
566
567 static const struct net_proto_family inet6_family_ops = {
568 .family = PF_INET6,
569 .create = inet6_create,
570 .owner = THIS_MODULE,
571 };
572
573 int inet6_register_protosw(struct inet_protosw *p)
574 {
575 struct list_head *lh;
576 struct inet_protosw *answer;
577 struct list_head *last_perm;
578 int protocol = p->protocol;
579 int ret;
580
581 spin_lock_bh(&inetsw6_lock);
582
583 ret = -EINVAL;
584 if (p->type >= SOCK_MAX)
585 goto out_illegal;
586
587 /* If we are trying to override a permanent protocol, bail. */
588 answer = NULL;
589 ret = -EPERM;
590 last_perm = &inetsw6[p->type];
591 list_for_each(lh, &inetsw6[p->type]) {
592 answer = list_entry(lh, struct inet_protosw, list);
593
594 /* Check only the non-wild match. */
595 if (INET_PROTOSW_PERMANENT & answer->flags) {
596 if (protocol == answer->protocol)
597 break;
598 last_perm = lh;
599 }
600
601 answer = NULL;
602 }
603 if (answer)
604 goto out_permanent;
605
606 /* Add the new entry after the last permanent entry if any, so that
607 * the new entry does not override a permanent entry when matched with
608 * a wild-card protocol. But it is allowed to override any existing
609 * non-permanent entry. This means that when we remove this entry, the
610 * system automatically returns to the old behavior.
611 */
612 list_add_rcu(&p->list, last_perm);
613 ret = 0;
614 out:
615 spin_unlock_bh(&inetsw6_lock);
616 return ret;
617
618 out_permanent:
619 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
620 protocol);
621 goto out;
622
623 out_illegal:
624 printk(KERN_ERR
625 "Ignoring attempt to register invalid socket type %d.\n",
626 p->type);
627 goto out;
628 }
629
630 EXPORT_SYMBOL(inet6_register_protosw);
631
632 void
633 inet6_unregister_protosw(struct inet_protosw *p)
634 {
635 if (INET_PROTOSW_PERMANENT & p->flags) {
636 printk(KERN_ERR
637 "Attempt to unregister permanent protocol %d.\n",
638 p->protocol);
639 } else {
640 spin_lock_bh(&inetsw6_lock);
641 list_del_rcu(&p->list);
642 spin_unlock_bh(&inetsw6_lock);
643
644 synchronize_net();
645 }
646 }
647
648 EXPORT_SYMBOL(inet6_unregister_protosw);
649
650 int inet6_sk_rebuild_header(struct sock *sk)
651 {
652 struct ipv6_pinfo *np = inet6_sk(sk);
653 struct dst_entry *dst;
654
655 dst = __sk_dst_check(sk, np->dst_cookie);
656
657 if (dst == NULL) {
658 struct inet_sock *inet = inet_sk(sk);
659 struct in6_addr *final_p, final;
660 struct flowi6 fl6;
661
662 memset(&fl6, 0, sizeof(fl6));
663 fl6.flowi6_proto = sk->sk_protocol;
664 fl6.daddr = np->daddr;
665 fl6.saddr = np->saddr;
666 fl6.flowlabel = np->flow_label;
667 fl6.flowi6_oif = sk->sk_bound_dev_if;
668 fl6.flowi6_mark = sk->sk_mark;
669 fl6.fl6_dport = inet->inet_dport;
670 fl6.fl6_sport = inet->inet_sport;
671 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
672
673 final_p = fl6_update_dst(&fl6, np->opt, &final);
674
675 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
676 if (IS_ERR(dst)) {
677 sk->sk_route_caps = 0;
678 sk->sk_err_soft = -PTR_ERR(dst);
679 return PTR_ERR(dst);
680 }
681
682 __ip6_dst_store(sk, dst, NULL, NULL);
683 }
684
685 return 0;
686 }
687
688 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
689
690 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
691 {
692 struct ipv6_pinfo *np = inet6_sk(sk);
693 struct inet6_skb_parm *opt = IP6CB(skb);
694
695 if (np->rxopt.all) {
696 if ((opt->hop && (np->rxopt.bits.hopopts ||
697 np->rxopt.bits.ohopopts)) ||
698 ((IPV6_FLOWINFO_MASK &
699 *(__be32 *)skb_network_header(skb)) &&
700 np->rxopt.bits.rxflow) ||
701 (opt->srcrt && (np->rxopt.bits.srcrt ||
702 np->rxopt.bits.osrcrt)) ||
703 ((opt->dst1 || opt->dst0) &&
704 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
705 return 1;
706 }
707 return 0;
708 }
709
710 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
711
712 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
713 {
714 const struct inet6_protocol *ops = NULL;
715
716 for (;;) {
717 struct ipv6_opt_hdr *opth;
718 int len;
719
720 if (proto != NEXTHDR_HOP) {
721 ops = rcu_dereference(inet6_protos[proto]);
722
723 if (unlikely(!ops))
724 break;
725
726 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
727 break;
728 }
729
730 if (unlikely(!pskb_may_pull(skb, 8)))
731 break;
732
733 opth = (void *)skb->data;
734 len = ipv6_optlen(opth);
735
736 if (unlikely(!pskb_may_pull(skb, len)))
737 break;
738
739 proto = opth->nexthdr;
740 __skb_pull(skb, len);
741 }
742
743 return proto;
744 }
745
746 static int ipv6_gso_send_check(struct sk_buff *skb)
747 {
748 const struct ipv6hdr *ipv6h;
749 const struct inet6_protocol *ops;
750 int err = -EINVAL;
751
752 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
753 goto out;
754
755 ipv6h = ipv6_hdr(skb);
756 __skb_pull(skb, sizeof(*ipv6h));
757 err = -EPROTONOSUPPORT;
758
759 rcu_read_lock();
760 ops = rcu_dereference(inet6_protos[
761 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
762
763 if (likely(ops && ops->gso_send_check)) {
764 skb_reset_transport_header(skb);
765 err = ops->gso_send_check(skb);
766 }
767 rcu_read_unlock();
768
769 out:
770 return err;
771 }
772
773 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
774 netdev_features_t features)
775 {
776 struct sk_buff *segs = ERR_PTR(-EINVAL);
777 struct ipv6hdr *ipv6h;
778 const struct inet6_protocol *ops;
779 int proto;
780 struct frag_hdr *fptr;
781 unsigned int unfrag_ip6hlen;
782 u8 *prevhdr;
783 int offset = 0;
784
785 if (!(features & NETIF_F_V6_CSUM))
786 features &= ~NETIF_F_SG;
787
788 if (unlikely(skb_shinfo(skb)->gso_type &
789 ~(SKB_GSO_UDP |
790 SKB_GSO_DODGY |
791 SKB_GSO_TCP_ECN |
792 SKB_GSO_TCPV6 |
793 0)))
794 goto out;
795
796 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
797 goto out;
798
799 ipv6h = ipv6_hdr(skb);
800 __skb_pull(skb, sizeof(*ipv6h));
801 segs = ERR_PTR(-EPROTONOSUPPORT);
802
803 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
804 rcu_read_lock();
805 ops = rcu_dereference(inet6_protos[proto]);
806 if (likely(ops && ops->gso_segment)) {
807 skb_reset_transport_header(skb);
808 segs = ops->gso_segment(skb, features);
809 }
810 rcu_read_unlock();
811
812 if (IS_ERR(segs))
813 goto out;
814
815 for (skb = segs; skb; skb = skb->next) {
816 ipv6h = ipv6_hdr(skb);
817 ipv6h->payload_len = htons(skb->len - skb->mac_len -
818 sizeof(*ipv6h));
819 if (proto == IPPROTO_UDP) {
820 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
821 fptr = (struct frag_hdr *)(skb_network_header(skb) +
822 unfrag_ip6hlen);
823 fptr->frag_off = htons(offset);
824 if (skb->next != NULL)
825 fptr->frag_off |= htons(IP6_MF);
826 offset += (ntohs(ipv6h->payload_len) -
827 sizeof(struct frag_hdr));
828 }
829 }
830
831 out:
832 return segs;
833 }
834
835 struct ipv6_gro_cb {
836 struct napi_gro_cb napi;
837 int proto;
838 };
839
840 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
841
842 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
843 struct sk_buff *skb)
844 {
845 const struct inet6_protocol *ops;
846 struct sk_buff **pp = NULL;
847 struct sk_buff *p;
848 struct ipv6hdr *iph;
849 unsigned int nlen;
850 unsigned int hlen;
851 unsigned int off;
852 int flush = 1;
853 int proto;
854 __wsum csum;
855
856 off = skb_gro_offset(skb);
857 hlen = off + sizeof(*iph);
858 iph = skb_gro_header_fast(skb, off);
859 if (skb_gro_header_hard(skb, hlen)) {
860 iph = skb_gro_header_slow(skb, hlen, off);
861 if (unlikely(!iph))
862 goto out;
863 }
864
865 skb_gro_pull(skb, sizeof(*iph));
866 skb_set_transport_header(skb, skb_gro_offset(skb));
867
868 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
869
870 rcu_read_lock();
871 proto = iph->nexthdr;
872 ops = rcu_dereference(inet6_protos[proto]);
873 if (!ops || !ops->gro_receive) {
874 __pskb_pull(skb, skb_gro_offset(skb));
875 proto = ipv6_gso_pull_exthdrs(skb, proto);
876 skb_gro_pull(skb, -skb_transport_offset(skb));
877 skb_reset_transport_header(skb);
878 __skb_push(skb, skb_gro_offset(skb));
879
880 ops = rcu_dereference(inet6_protos[proto]);
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 __percpu **)net->mib.udp_stats_in6,
975 sizeof(struct udp_mib),
976 __alignof__(struct udp_mib)) < 0)
977 return -ENOMEM;
978 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
979 sizeof(struct udp_mib),
980 __alignof__(struct udp_mib)) < 0)
981 goto err_udplite_mib;
982 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
983 sizeof(struct ipstats_mib),
984 __alignof__(struct ipstats_mib)) < 0)
985 goto err_ip_mib;
986 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
987 sizeof(struct icmpv6_mib),
988 __alignof__(struct icmpv6_mib)) < 0)
989 goto err_icmp_mib;
990 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
991 GFP_KERNEL);
992 if (!net->mib.icmpv6msg_statistics)
993 goto err_icmpmsg_mib;
994 return 0;
995
996 err_icmpmsg_mib:
997 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
998 err_icmp_mib:
999 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1000 err_ip_mib:
1001 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1002 err_udplite_mib:
1003 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1004 return -ENOMEM;
1005 }
1006
1007 static void ipv6_cleanup_mibs(struct net *net)
1008 {
1009 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1010 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1011 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1012 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1013 kfree(net->mib.icmpv6msg_statistics);
1014 }
1015
1016 static int __net_init inet6_net_init(struct net *net)
1017 {
1018 int err = 0;
1019
1020 net->ipv6.sysctl.bindv6only = 0;
1021 net->ipv6.sysctl.icmpv6_time = 1*HZ;
1022
1023 err = ipv6_init_mibs(net);
1024 if (err)
1025 return err;
1026 #ifdef CONFIG_PROC_FS
1027 err = udp6_proc_init(net);
1028 if (err)
1029 goto out;
1030 err = tcp6_proc_init(net);
1031 if (err)
1032 goto proc_tcp6_fail;
1033 err = ac6_proc_init(net);
1034 if (err)
1035 goto proc_ac6_fail;
1036 #endif
1037 return err;
1038
1039 #ifdef CONFIG_PROC_FS
1040 proc_ac6_fail:
1041 tcp6_proc_exit(net);
1042 proc_tcp6_fail:
1043 udp6_proc_exit(net);
1044 out:
1045 ipv6_cleanup_mibs(net);
1046 return err;
1047 #endif
1048 }
1049
1050 static void __net_exit inet6_net_exit(struct net *net)
1051 {
1052 #ifdef CONFIG_PROC_FS
1053 udp6_proc_exit(net);
1054 tcp6_proc_exit(net);
1055 ac6_proc_exit(net);
1056 #endif
1057 ipv6_cleanup_mibs(net);
1058 }
1059
1060 static struct pernet_operations inet6_net_ops = {
1061 .init = inet6_net_init,
1062 .exit = inet6_net_exit,
1063 };
1064
1065 static int __init inet6_init(void)
1066 {
1067 struct sk_buff *dummy_skb;
1068 struct list_head *r;
1069 int err = 0;
1070
1071 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1072
1073 /* Register the socket-side information for inet6_create. */
1074 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1075 INIT_LIST_HEAD(r);
1076
1077 if (disable_ipv6_mod) {
1078 printk(KERN_INFO
1079 "IPv6: Loaded, but administratively disabled, "
1080 "reboot required to enable\n");
1081 goto out;
1082 }
1083
1084 err = proto_register(&tcpv6_prot, 1);
1085 if (err)
1086 goto out;
1087
1088 err = proto_register(&udpv6_prot, 1);
1089 if (err)
1090 goto out_unregister_tcp_proto;
1091
1092 err = proto_register(&udplitev6_prot, 1);
1093 if (err)
1094 goto out_unregister_udp_proto;
1095
1096 err = proto_register(&rawv6_prot, 1);
1097 if (err)
1098 goto out_unregister_udplite_proto;
1099
1100
1101 /* We MUST register RAW sockets before we create the ICMP6,
1102 * IGMP6, or NDISC control sockets.
1103 */
1104 err = rawv6_init();
1105 if (err)
1106 goto out_unregister_raw_proto;
1107
1108 /* Register the family here so that the init calls below will
1109 * be able to create sockets. (?? is this dangerous ??)
1110 */
1111 err = sock_register(&inet6_family_ops);
1112 if (err)
1113 goto out_sock_register_fail;
1114
1115 #ifdef CONFIG_SYSCTL
1116 err = ipv6_static_sysctl_register();
1117 if (err)
1118 goto static_sysctl_fail;
1119 #endif
1120 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
1121
1122 /*
1123 * ipngwg API draft makes clear that the correct semantics
1124 * for TCP and UDP is to consider one TCP and UDP instance
1125 * in a host available by both INET and INET6 APIs and
1126 * able to communicate via both network protocols.
1127 */
1128
1129 err = register_pernet_subsys(&inet6_net_ops);
1130 if (err)
1131 goto register_pernet_fail;
1132 err = icmpv6_init();
1133 if (err)
1134 goto icmp_fail;
1135 err = ip6_mr_init();
1136 if (err)
1137 goto ipmr_fail;
1138 err = ndisc_init();
1139 if (err)
1140 goto ndisc_fail;
1141 err = igmp6_init();
1142 if (err)
1143 goto igmp_fail;
1144 err = ipv6_netfilter_init();
1145 if (err)
1146 goto netfilter_fail;
1147 /* Create /proc/foo6 entries. */
1148 #ifdef CONFIG_PROC_FS
1149 err = -ENOMEM;
1150 if (raw6_proc_init())
1151 goto proc_raw6_fail;
1152 if (udplite6_proc_init())
1153 goto proc_udplite6_fail;
1154 if (ipv6_misc_proc_init())
1155 goto proc_misc6_fail;
1156 if (if6_proc_init())
1157 goto proc_if6_fail;
1158 #endif
1159 err = ip6_route_init();
1160 if (err)
1161 goto ip6_route_fail;
1162 err = ip6_flowlabel_init();
1163 if (err)
1164 goto ip6_flowlabel_fail;
1165 err = addrconf_init();
1166 if (err)
1167 goto addrconf_fail;
1168
1169 /* Init v6 extension headers. */
1170 err = ipv6_exthdrs_init();
1171 if (err)
1172 goto ipv6_exthdrs_fail;
1173
1174 err = ipv6_frag_init();
1175 if (err)
1176 goto ipv6_frag_fail;
1177
1178 /* Init v6 transport protocols. */
1179 err = udpv6_init();
1180 if (err)
1181 goto udpv6_fail;
1182
1183 err = udplitev6_init();
1184 if (err)
1185 goto udplitev6_fail;
1186
1187 err = tcpv6_init();
1188 if (err)
1189 goto tcpv6_fail;
1190
1191 err = ipv6_packet_init();
1192 if (err)
1193 goto ipv6_packet_fail;
1194
1195 #ifdef CONFIG_SYSCTL
1196 err = ipv6_sysctl_register();
1197 if (err)
1198 goto sysctl_fail;
1199 #endif
1200 out:
1201 return err;
1202
1203 #ifdef CONFIG_SYSCTL
1204 sysctl_fail:
1205 ipv6_packet_cleanup();
1206 #endif
1207 ipv6_packet_fail:
1208 tcpv6_exit();
1209 tcpv6_fail:
1210 udplitev6_exit();
1211 udplitev6_fail:
1212 udpv6_exit();
1213 udpv6_fail:
1214 ipv6_frag_exit();
1215 ipv6_frag_fail:
1216 ipv6_exthdrs_exit();
1217 ipv6_exthdrs_fail:
1218 addrconf_cleanup();
1219 addrconf_fail:
1220 ip6_flowlabel_cleanup();
1221 ip6_flowlabel_fail:
1222 ip6_route_cleanup();
1223 ip6_route_fail:
1224 #ifdef CONFIG_PROC_FS
1225 if6_proc_exit();
1226 proc_if6_fail:
1227 ipv6_misc_proc_exit();
1228 proc_misc6_fail:
1229 udplite6_proc_exit();
1230 proc_udplite6_fail:
1231 raw6_proc_exit();
1232 proc_raw6_fail:
1233 #endif
1234 ipv6_netfilter_fini();
1235 netfilter_fail:
1236 igmp6_cleanup();
1237 igmp_fail:
1238 ndisc_cleanup();
1239 ndisc_fail:
1240 ip6_mr_cleanup();
1241 ipmr_fail:
1242 icmpv6_cleanup();
1243 icmp_fail:
1244 unregister_pernet_subsys(&inet6_net_ops);
1245 register_pernet_fail:
1246 #ifdef CONFIG_SYSCTL
1247 ipv6_static_sysctl_unregister();
1248 static_sysctl_fail:
1249 #endif
1250 sock_unregister(PF_INET6);
1251 rtnl_unregister_all(PF_INET6);
1252 out_sock_register_fail:
1253 rawv6_exit();
1254 out_unregister_raw_proto:
1255 proto_unregister(&rawv6_prot);
1256 out_unregister_udplite_proto:
1257 proto_unregister(&udplitev6_prot);
1258 out_unregister_udp_proto:
1259 proto_unregister(&udpv6_prot);
1260 out_unregister_tcp_proto:
1261 proto_unregister(&tcpv6_prot);
1262 goto out;
1263 }
1264 module_init(inet6_init);
1265
1266 static void __exit inet6_exit(void)
1267 {
1268 if (disable_ipv6_mod)
1269 return;
1270
1271 /* First of all disallow new sockets creation. */
1272 sock_unregister(PF_INET6);
1273 /* Disallow any further netlink messages */
1274 rtnl_unregister_all(PF_INET6);
1275
1276 #ifdef CONFIG_SYSCTL
1277 ipv6_sysctl_unregister();
1278 #endif
1279 udpv6_exit();
1280 udplitev6_exit();
1281 tcpv6_exit();
1282
1283 /* Cleanup code parts. */
1284 ipv6_packet_cleanup();
1285 ipv6_frag_exit();
1286 ipv6_exthdrs_exit();
1287 addrconf_cleanup();
1288 ip6_flowlabel_cleanup();
1289 ip6_route_cleanup();
1290 #ifdef CONFIG_PROC_FS
1291
1292 /* Cleanup code parts. */
1293 if6_proc_exit();
1294 ipv6_misc_proc_exit();
1295 udplite6_proc_exit();
1296 raw6_proc_exit();
1297 #endif
1298 ipv6_netfilter_fini();
1299 igmp6_cleanup();
1300 ndisc_cleanup();
1301 ip6_mr_cleanup();
1302 icmpv6_cleanup();
1303 rawv6_exit();
1304
1305 unregister_pernet_subsys(&inet6_net_ops);
1306 #ifdef CONFIG_SYSCTL
1307 ipv6_static_sysctl_unregister();
1308 #endif
1309 proto_unregister(&rawv6_prot);
1310 proto_unregister(&udplitev6_prot);
1311 proto_unregister(&udpv6_prot);
1312 proto_unregister(&tcpv6_prot);
1313
1314 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1315 }
1316 module_exit(inet6_exit);
1317
1318 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux kernel - Deliverables
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