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 #define pr_fmt(fmt) "IPv6: " fmt
22
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/errno.h>
26 #include <linux/types.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/kernel.h>
30 #include <linux/timer.h>
31 #include <linux/string.h>
32 #include <linux/sockios.h>
33 #include <linux/net.h>
34 #include <linux/fcntl.h>
35 #include <linux/mm.h>
36 #include <linux/interrupt.h>
37 #include <linux/proc_fs.h>
38 #include <linux/stat.h>
39 #include <linux/init.h>
40 #include <linux/slab.h>
41
42 #include <linux/inet.h>
43 #include <linux/netdevice.h>
44 #include <linux/icmpv6.h>
45 #include <linux/netfilter_ipv6.h>
46
47 #include <net/ip.h>
48 #include <net/ipv6.h>
49 #include <net/udp.h>
50 #include <net/udplite.h>
51 #include <net/tcp.h>
52 #include <net/ping.h>
53 #include <net/protocol.h>
54 #include <net/inet_common.h>
55 #include <net/route.h>
56 #include <net/transp_v6.h>
57 #include <net/ip6_route.h>
58 #include <net/addrconf.h>
59 #include <net/ndisc.h>
60 #ifdef CONFIG_IPV6_TUNNEL
61 #include <net/ip6_tunnel.h>
62 #endif
63
64 #include <asm/uaccess.h>
65 #include <linux/mroute6.h>
66
67 #ifdef CONFIG_ANDROID_PARANOID_NETWORK
68 #include <linux/android_aid.h>
69
current_has_network(void)70 static inline int current_has_network(void)
71 {
72 return in_egroup_p(AID_INET) || capable(CAP_NET_RAW);
73 }
74 #else
current_has_network(void)75 static inline int current_has_network(void)
76 {
77 return 1;
78 }
79 #endif
80
81 MODULE_AUTHOR("Cast of dozens");
82 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
83 MODULE_LICENSE("GPL");
84
85 /* The inetsw6 table contains everything that inet6_create needs to
86 * build a new socket.
87 */
88 static struct list_head inetsw6[SOCK_MAX];
89 static DEFINE_SPINLOCK(inetsw6_lock);
90
91 struct ipv6_params ipv6_defaults = {
92 .disable_ipv6 = 0,
93 .autoconf = 1,
94 };
95
96 static int disable_ipv6_mod;
97
98 module_param_named(disable, disable_ipv6_mod, int, 0444);
99 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
100
101 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
102 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
103
104 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
105 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
106
inet6_sk_generic(struct sock * sk)107 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
108 {
109 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
110
111 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
112 }
113
inet6_create(struct net * net,struct socket * sock,int protocol,int kern)114 static int inet6_create(struct net *net, struct socket *sock, int protocol,
115 int kern)
116 {
117 struct inet_sock *inet;
118 struct ipv6_pinfo *np;
119 struct sock *sk;
120 struct inet_protosw *answer;
121 struct proto *answer_prot;
122 unsigned char answer_flags;
123 int try_loading_module = 0;
124 int err;
125
126 if (!current_has_network())
127 return -EACCES;
128
129 if (protocol < 0 || protocol >= IPPROTO_MAX)
130 return -EINVAL;
131
132 /* Look for the requested type/protocol pair. */
133 lookup_protocol:
134 err = -ESOCKTNOSUPPORT;
135 rcu_read_lock();
136 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
137
138 err = 0;
139 /* Check the non-wild match. */
140 if (protocol == answer->protocol) {
141 if (protocol != IPPROTO_IP)
142 break;
143 } else {
144 /* Check for the two wild cases. */
145 if (IPPROTO_IP == protocol) {
146 protocol = answer->protocol;
147 break;
148 }
149 if (IPPROTO_IP == answer->protocol)
150 break;
151 }
152 err = -EPROTONOSUPPORT;
153 }
154
155 if (err) {
156 if (try_loading_module < 2) {
157 rcu_read_unlock();
158 /*
159 * Be more specific, e.g. net-pf-10-proto-132-type-1
160 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
161 */
162 if (++try_loading_module == 1)
163 request_module("net-pf-%d-proto-%d-type-%d",
164 PF_INET6, protocol, sock->type);
165 /*
166 * Fall back to generic, e.g. net-pf-10-proto-132
167 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
168 */
169 else
170 request_module("net-pf-%d-proto-%d",
171 PF_INET6, protocol);
172 goto lookup_protocol;
173 } else
174 goto out_rcu_unlock;
175 }
176
177 err = -EPERM;
178 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
179 goto out_rcu_unlock;
180
181 sock->ops = answer->ops;
182 answer_prot = answer->prot;
183 answer_flags = answer->flags;
184 rcu_read_unlock();
185
186 WARN_ON(answer_prot->slab == NULL);
187
188 err = -ENOBUFS;
189 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
190 if (sk == NULL)
191 goto out;
192
193 sock_init_data(sock, sk);
194
195 err = 0;
196 if (INET_PROTOSW_REUSE & answer_flags)
197 sk->sk_reuse = SK_CAN_REUSE;
198
199 inet = inet_sk(sk);
200 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
201
202 if (SOCK_RAW == sock->type) {
203 inet->inet_num = protocol;
204 if (IPPROTO_RAW == protocol)
205 inet->hdrincl = 1;
206 }
207
208 sk->sk_destruct = inet_sock_destruct;
209 sk->sk_family = PF_INET6;
210 sk->sk_protocol = protocol;
211
212 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
213
214 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
215 np->hop_limit = -1;
216 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
217 np->mc_loop = 1;
218 np->pmtudisc = IPV6_PMTUDISC_WANT;
219 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
220
221 /* Init the ipv4 part of the socket since we can have sockets
222 * using v6 API for ipv4.
223 */
224 inet->uc_ttl = -1;
225
226 inet->mc_loop = 1;
227 inet->mc_ttl = 1;
228 inet->mc_index = 0;
229 inet->mc_list = NULL;
230 inet->rcv_tos = 0;
231
232 if (net->ipv4.sysctl_ip_no_pmtu_disc)
233 inet->pmtudisc = IP_PMTUDISC_DONT;
234 else
235 inet->pmtudisc = IP_PMTUDISC_WANT;
236 /*
237 * Increment only the relevant sk_prot->socks debug field, this changes
238 * the previous behaviour of incrementing both the equivalent to
239 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
240 *
241 * This allows better debug granularity as we'll know exactly how many
242 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
243 * transport protocol socks. -acme
244 */
245 sk_refcnt_debug_inc(sk);
246
247 if (inet->inet_num) {
248 /* It assumes that any protocol which allows
249 * the user to assign a number at socket
250 * creation time automatically shares.
251 */
252 inet->inet_sport = htons(inet->inet_num);
253 sk->sk_prot->hash(sk);
254 }
255 if (sk->sk_prot->init) {
256 err = sk->sk_prot->init(sk);
257 if (err) {
258 sk_common_release(sk);
259 goto out;
260 }
261 }
262 out:
263 return err;
264 out_rcu_unlock:
265 rcu_read_unlock();
266 goto out;
267 }
268
269
270 /* bind for INET6 API */
inet6_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)271 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
272 {
273 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
274 struct sock *sk = sock->sk;
275 struct inet_sock *inet = inet_sk(sk);
276 struct ipv6_pinfo *np = inet6_sk(sk);
277 struct net *net = sock_net(sk);
278 __be32 v4addr = 0;
279 unsigned short snum;
280 int addr_type = 0;
281 int err = 0;
282
283 /* If the socket has its own bind function then use it. */
284 if (sk->sk_prot->bind)
285 return sk->sk_prot->bind(sk, uaddr, addr_len);
286
287 if (addr_len < SIN6_LEN_RFC2133)
288 return -EINVAL;
289
290 if (addr->sin6_family != AF_INET6)
291 return -EAFNOSUPPORT;
292
293 addr_type = ipv6_addr_type(&addr->sin6_addr);
294 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
295 return -EINVAL;
296
297 snum = ntohs(addr->sin6_port);
298 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
299 return -EACCES;
300
301 lock_sock(sk);
302
303 /* Check these errors (active socket, double bind). */
304 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
305 err = -EINVAL;
306 goto out;
307 }
308
309 /* Check if the address belongs to the host. */
310 if (addr_type == IPV6_ADDR_MAPPED) {
311 int chk_addr_ret;
312
313 /* Binding to v4-mapped address on a v6-only socket
314 * makes no sense
315 */
316 if (sk->sk_ipv6only) {
317 err = -EINVAL;
318 goto out;
319 }
320
321 /* Reproduce AF_INET checks to make the bindings consistent */
322 v4addr = addr->sin6_addr.s6_addr32[3];
323 chk_addr_ret = inet_addr_type(net, v4addr);
324 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
325 !(inet->freebind || inet->transparent) &&
326 v4addr != htonl(INADDR_ANY) &&
327 chk_addr_ret != RTN_LOCAL &&
328 chk_addr_ret != RTN_MULTICAST &&
329 chk_addr_ret != RTN_BROADCAST) {
330 err = -EADDRNOTAVAIL;
331 goto out;
332 }
333 } else {
334 if (addr_type != IPV6_ADDR_ANY) {
335 struct net_device *dev = NULL;
336
337 rcu_read_lock();
338 if (__ipv6_addr_needs_scope_id(addr_type)) {
339 if (addr_len >= sizeof(struct sockaddr_in6) &&
340 addr->sin6_scope_id) {
341 /* Override any existing binding, if another one
342 * is supplied by user.
343 */
344 sk->sk_bound_dev_if = addr->sin6_scope_id;
345 }
346
347 /* Binding to link-local address requires an interface */
348 if (!sk->sk_bound_dev_if) {
349 err = -EINVAL;
350 goto out_unlock;
351 }
352 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
353 if (!dev) {
354 err = -ENODEV;
355 goto out_unlock;
356 }
357 }
358
359 /* ipv4 addr of the socket is invalid. Only the
360 * unspecified and mapped address have a v4 equivalent.
361 */
362 v4addr = LOOPBACK4_IPV6;
363 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
364 if (!(inet->freebind || inet->transparent) &&
365 !ipv6_chk_addr(net, &addr->sin6_addr,
366 dev, 0)) {
367 err = -EADDRNOTAVAIL;
368 goto out_unlock;
369 }
370 }
371 rcu_read_unlock();
372 }
373 }
374
375 inet->inet_rcv_saddr = v4addr;
376 inet->inet_saddr = v4addr;
377
378 sk->sk_v6_rcv_saddr = addr->sin6_addr;
379
380 if (!(addr_type & IPV6_ADDR_MULTICAST))
381 np->saddr = addr->sin6_addr;
382
383 /* Make sure we are allowed to bind here. */
384 if (sk->sk_prot->get_port(sk, snum)) {
385 inet_reset_saddr(sk);
386 err = -EADDRINUSE;
387 goto out;
388 }
389
390 if (addr_type != IPV6_ADDR_ANY) {
391 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
392 if (addr_type != IPV6_ADDR_MAPPED)
393 sk->sk_ipv6only = 1;
394 }
395 if (snum)
396 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
397 inet->inet_sport = htons(inet->inet_num);
398 inet->inet_dport = 0;
399 inet->inet_daddr = 0;
400 out:
401 release_sock(sk);
402 return err;
403 out_unlock:
404 rcu_read_unlock();
405 goto out;
406 }
407 EXPORT_SYMBOL(inet6_bind);
408
inet6_release(struct socket * sock)409 int inet6_release(struct socket *sock)
410 {
411 struct sock *sk = sock->sk;
412
413 if (sk == NULL)
414 return -EINVAL;
415
416 /* Free mc lists */
417 ipv6_sock_mc_close(sk);
418
419 /* Free ac lists */
420 ipv6_sock_ac_close(sk);
421
422 return inet_release(sock);
423 }
424 EXPORT_SYMBOL(inet6_release);
425
inet6_destroy_sock(struct sock * sk)426 void inet6_destroy_sock(struct sock *sk)
427 {
428 struct ipv6_pinfo *np = inet6_sk(sk);
429 struct sk_buff *skb;
430 struct ipv6_txoptions *opt;
431
432 /* Release rx options */
433
434 skb = xchg(&np->pktoptions, NULL);
435 if (skb != NULL)
436 kfree_skb(skb);
437
438 skb = xchg(&np->rxpmtu, NULL);
439 if (skb != NULL)
440 kfree_skb(skb);
441
442 /* Free flowlabels */
443 fl6_free_socklist(sk);
444
445 /* Free tx options */
446
447 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
448 if (opt) {
449 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
450 txopt_put(opt);
451 }
452 }
453 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
454
455 /*
456 * This does both peername and sockname.
457 */
458
inet6_getname(struct socket * sock,struct sockaddr * uaddr,int * uaddr_len,int peer)459 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
460 int *uaddr_len, int peer)
461 {
462 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
463 struct sock *sk = sock->sk;
464 struct inet_sock *inet = inet_sk(sk);
465 struct ipv6_pinfo *np = inet6_sk(sk);
466
467 sin->sin6_family = AF_INET6;
468 sin->sin6_flowinfo = 0;
469 sin->sin6_scope_id = 0;
470 if (peer) {
471 if (!inet->inet_dport)
472 return -ENOTCONN;
473 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
474 peer == 1)
475 return -ENOTCONN;
476 sin->sin6_port = inet->inet_dport;
477 sin->sin6_addr = sk->sk_v6_daddr;
478 if (np->sndflow)
479 sin->sin6_flowinfo = np->flow_label;
480 } else {
481 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
482 sin->sin6_addr = np->saddr;
483 else
484 sin->sin6_addr = sk->sk_v6_rcv_saddr;
485
486 sin->sin6_port = inet->inet_sport;
487 }
488 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
489 sk->sk_bound_dev_if);
490 *uaddr_len = sizeof(*sin);
491 return 0;
492 }
493 EXPORT_SYMBOL(inet6_getname);
494
inet6_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)495 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
496 {
497 struct sock *sk = sock->sk;
498 struct net *net = sock_net(sk);
499
500 switch (cmd) {
501 case SIOCGSTAMP:
502 return sock_get_timestamp(sk, (struct timeval __user *)arg);
503
504 case SIOCGSTAMPNS:
505 return sock_get_timestampns(sk, (struct timespec __user *)arg);
506
507 case SIOCADDRT:
508 case SIOCDELRT:
509
510 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
511
512 case SIOCSIFADDR:
513 return addrconf_add_ifaddr(net, (void __user *) arg);
514 case SIOCDIFADDR:
515 return addrconf_del_ifaddr(net, (void __user *) arg);
516 case SIOCSIFDSTADDR:
517 return addrconf_set_dstaddr(net, (void __user *) arg);
518 default:
519 if (!sk->sk_prot->ioctl)
520 return -ENOIOCTLCMD;
521 return sk->sk_prot->ioctl(sk, cmd, arg);
522 }
523 /*NOTREACHED*/
524 return 0;
525 }
526 EXPORT_SYMBOL(inet6_ioctl);
527
528 const struct proto_ops inet6_stream_ops = {
529 .family = PF_INET6,
530 .owner = THIS_MODULE,
531 .release = inet6_release,
532 .bind = inet6_bind,
533 .connect = inet_stream_connect, /* ok */
534 .socketpair = sock_no_socketpair, /* a do nothing */
535 .accept = inet_accept, /* ok */
536 .getname = inet6_getname,
537 .poll = tcp_poll, /* ok */
538 .ioctl = inet6_ioctl, /* must change */
539 .listen = inet_listen, /* ok */
540 .shutdown = inet_shutdown, /* ok */
541 .setsockopt = sock_common_setsockopt, /* ok */
542 .getsockopt = sock_common_getsockopt, /* ok */
543 .sendmsg = inet_sendmsg, /* ok */
544 .recvmsg = inet_recvmsg, /* ok */
545 .mmap = sock_no_mmap,
546 .sendpage = inet_sendpage,
547 .splice_read = tcp_splice_read,
548 #ifdef CONFIG_COMPAT
549 .compat_setsockopt = compat_sock_common_setsockopt,
550 .compat_getsockopt = compat_sock_common_getsockopt,
551 #endif
552 };
553
554 const struct proto_ops inet6_dgram_ops = {
555 .family = PF_INET6,
556 .owner = THIS_MODULE,
557 .release = inet6_release,
558 .bind = inet6_bind,
559 .connect = inet_dgram_connect, /* ok */
560 .socketpair = sock_no_socketpair, /* a do nothing */
561 .accept = sock_no_accept, /* a do nothing */
562 .getname = inet6_getname,
563 .poll = udp_poll, /* ok */
564 .ioctl = inet6_ioctl, /* must change */
565 .listen = sock_no_listen, /* ok */
566 .shutdown = inet_shutdown, /* ok */
567 .setsockopt = sock_common_setsockopt, /* ok */
568 .getsockopt = sock_common_getsockopt, /* ok */
569 .sendmsg = inet_sendmsg, /* ok */
570 .recvmsg = inet_recvmsg, /* ok */
571 .mmap = sock_no_mmap,
572 .sendpage = sock_no_sendpage,
573 #ifdef CONFIG_COMPAT
574 .compat_setsockopt = compat_sock_common_setsockopt,
575 .compat_getsockopt = compat_sock_common_getsockopt,
576 #endif
577 };
578
579 static const struct net_proto_family inet6_family_ops = {
580 .family = PF_INET6,
581 .create = inet6_create,
582 .owner = THIS_MODULE,
583 };
584
inet6_register_protosw(struct inet_protosw * p)585 int inet6_register_protosw(struct inet_protosw *p)
586 {
587 struct list_head *lh;
588 struct inet_protosw *answer;
589 struct list_head *last_perm;
590 int protocol = p->protocol;
591 int ret;
592
593 spin_lock_bh(&inetsw6_lock);
594
595 ret = -EINVAL;
596 if (p->type >= SOCK_MAX)
597 goto out_illegal;
598
599 /* If we are trying to override a permanent protocol, bail. */
600 answer = NULL;
601 ret = -EPERM;
602 last_perm = &inetsw6[p->type];
603 list_for_each(lh, &inetsw6[p->type]) {
604 answer = list_entry(lh, struct inet_protosw, list);
605
606 /* Check only the non-wild match. */
607 if (INET_PROTOSW_PERMANENT & answer->flags) {
608 if (protocol == answer->protocol)
609 break;
610 last_perm = lh;
611 }
612
613 answer = NULL;
614 }
615 if (answer)
616 goto out_permanent;
617
618 /* Add the new entry after the last permanent entry if any, so that
619 * the new entry does not override a permanent entry when matched with
620 * a wild-card protocol. But it is allowed to override any existing
621 * non-permanent entry. This means that when we remove this entry, the
622 * system automatically returns to the old behavior.
623 */
624 list_add_rcu(&p->list, last_perm);
625 ret = 0;
626 out:
627 spin_unlock_bh(&inetsw6_lock);
628 return ret;
629
630 out_permanent:
631 pr_err("Attempt to override permanent protocol %d\n", protocol);
632 goto out;
633
634 out_illegal:
635 pr_err("Ignoring attempt to register invalid socket type %d\n",
636 p->type);
637 goto out;
638 }
639 EXPORT_SYMBOL(inet6_register_protosw);
640
641 void
inet6_unregister_protosw(struct inet_protosw * p)642 inet6_unregister_protosw(struct inet_protosw *p)
643 {
644 if (INET_PROTOSW_PERMANENT & p->flags) {
645 pr_err("Attempt to unregister permanent protocol %d\n",
646 p->protocol);
647 } else {
648 spin_lock_bh(&inetsw6_lock);
649 list_del_rcu(&p->list);
650 spin_unlock_bh(&inetsw6_lock);
651
652 synchronize_net();
653 }
654 }
655 EXPORT_SYMBOL(inet6_unregister_protosw);
656
inet6_sk_rebuild_header(struct sock * sk)657 int inet6_sk_rebuild_header(struct sock *sk)
658 {
659 struct ipv6_pinfo *np = inet6_sk(sk);
660 struct dst_entry *dst;
661
662 dst = __sk_dst_check(sk, np->dst_cookie);
663
664 if (dst == NULL) {
665 struct inet_sock *inet = inet_sk(sk);
666 struct in6_addr *final_p, final;
667 struct flowi6 fl6;
668
669 memset(&fl6, 0, sizeof(fl6));
670 fl6.flowi6_proto = sk->sk_protocol;
671 fl6.daddr = sk->sk_v6_daddr;
672 fl6.saddr = np->saddr;
673 fl6.flowlabel = np->flow_label;
674 fl6.flowi6_oif = sk->sk_bound_dev_if;
675 fl6.flowi6_mark = sk->sk_mark;
676 fl6.fl6_dport = inet->inet_dport;
677 fl6.fl6_sport = inet->inet_sport;
678 fl6.flowi6_uid = sk->sk_uid;
679 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
680
681 rcu_read_lock();
682 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
683 &final);
684 rcu_read_unlock();
685
686 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
687 if (IS_ERR(dst)) {
688 sk->sk_route_caps = 0;
689 sk->sk_err_soft = -PTR_ERR(dst);
690 return PTR_ERR(dst);
691 }
692
693 __ip6_dst_store(sk, dst, NULL, NULL);
694 }
695
696 return 0;
697 }
698 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
699
ipv6_opt_accepted(const struct sock * sk,const struct sk_buff * skb,const struct inet6_skb_parm * opt)700 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
701 const struct inet6_skb_parm *opt)
702 {
703 const struct ipv6_pinfo *np = inet6_sk(sk);
704
705 if (np->rxopt.all) {
706 if ((opt->hop && (np->rxopt.bits.hopopts ||
707 np->rxopt.bits.ohopopts)) ||
708 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
709 np->rxopt.bits.rxflow) ||
710 (opt->srcrt && (np->rxopt.bits.srcrt ||
711 np->rxopt.bits.osrcrt)) ||
712 ((opt->dst1 || opt->dst0) &&
713 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
714 return true;
715 }
716 return false;
717 }
718 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
719
720 static struct packet_type ipv6_packet_type __read_mostly = {
721 .type = cpu_to_be16(ETH_P_IPV6),
722 .func = ipv6_rcv,
723 };
724
ipv6_packet_init(void)725 static int __init ipv6_packet_init(void)
726 {
727 dev_add_pack(&ipv6_packet_type);
728 return 0;
729 }
730
ipv6_packet_cleanup(void)731 static void ipv6_packet_cleanup(void)
732 {
733 dev_remove_pack(&ipv6_packet_type);
734 }
735
ipv6_init_mibs(struct net * net)736 static int __net_init ipv6_init_mibs(struct net *net)
737 {
738 int i;
739
740 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
741 if (!net->mib.udp_stats_in6)
742 return -ENOMEM;
743 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
744 if (!net->mib.udplite_stats_in6)
745 goto err_udplite_mib;
746 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
747 if (!net->mib.ipv6_statistics)
748 goto err_ip_mib;
749
750 for_each_possible_cpu(i) {
751 struct ipstats_mib *af_inet6_stats;
752 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
753 u64_stats_init(&af_inet6_stats->syncp);
754 }
755
756
757 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
758 if (!net->mib.icmpv6_statistics)
759 goto err_icmp_mib;
760 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
761 GFP_KERNEL);
762 if (!net->mib.icmpv6msg_statistics)
763 goto err_icmpmsg_mib;
764 return 0;
765
766 err_icmpmsg_mib:
767 free_percpu(net->mib.icmpv6_statistics);
768 err_icmp_mib:
769 free_percpu(net->mib.ipv6_statistics);
770 err_ip_mib:
771 free_percpu(net->mib.udplite_stats_in6);
772 err_udplite_mib:
773 free_percpu(net->mib.udp_stats_in6);
774 return -ENOMEM;
775 }
776
ipv6_cleanup_mibs(struct net * net)777 static void ipv6_cleanup_mibs(struct net *net)
778 {
779 free_percpu(net->mib.udp_stats_in6);
780 free_percpu(net->mib.udplite_stats_in6);
781 free_percpu(net->mib.ipv6_statistics);
782 free_percpu(net->mib.icmpv6_statistics);
783 kfree(net->mib.icmpv6msg_statistics);
784 }
785
inet6_net_init(struct net * net)786 static int __net_init inet6_net_init(struct net *net)
787 {
788 int err = 0;
789
790 net->ipv6.sysctl.bindv6only = 0;
791 net->ipv6.sysctl.icmpv6_time = 1*HZ;
792 net->ipv6.sysctl.flowlabel_consistency = 1;
793 net->ipv6.sysctl.auto_flowlabels = 0;
794 atomic_set(&net->ipv6.fib6_sernum, 1);
795
796 err = ipv6_init_mibs(net);
797 if (err)
798 return err;
799 #ifdef CONFIG_PROC_FS
800 err = udp6_proc_init(net);
801 if (err)
802 goto out;
803 err = tcp6_proc_init(net);
804 if (err)
805 goto proc_tcp6_fail;
806 err = ac6_proc_init(net);
807 if (err)
808 goto proc_ac6_fail;
809 #endif
810 return err;
811
812 #ifdef CONFIG_PROC_FS
813 proc_ac6_fail:
814 tcp6_proc_exit(net);
815 proc_tcp6_fail:
816 udp6_proc_exit(net);
817 out:
818 ipv6_cleanup_mibs(net);
819 return err;
820 #endif
821 }
822
inet6_net_exit(struct net * net)823 static void __net_exit inet6_net_exit(struct net *net)
824 {
825 #ifdef CONFIG_PROC_FS
826 udp6_proc_exit(net);
827 tcp6_proc_exit(net);
828 ac6_proc_exit(net);
829 #endif
830 ipv6_cleanup_mibs(net);
831 }
832
833 static struct pernet_operations inet6_net_ops = {
834 .init = inet6_net_init,
835 .exit = inet6_net_exit,
836 };
837
838 static const struct ipv6_stub ipv6_stub_impl = {
839 .ipv6_sock_mc_join = ipv6_sock_mc_join,
840 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
841 .ipv6_dst_lookup = ip6_dst_lookup,
842 .udpv6_encap_enable = udpv6_encap_enable,
843 .ndisc_send_na = ndisc_send_na,
844 .nd_tbl = &nd_tbl,
845 };
846
inet6_init(void)847 static int __init inet6_init(void)
848 {
849 struct list_head *r;
850 int err = 0;
851
852 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
853
854 /* Register the socket-side information for inet6_create. */
855 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
856 INIT_LIST_HEAD(r);
857
858 if (disable_ipv6_mod) {
859 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
860 goto out;
861 }
862
863 err = proto_register(&tcpv6_prot, 1);
864 if (err)
865 goto out;
866
867 err = proto_register(&udpv6_prot, 1);
868 if (err)
869 goto out_unregister_tcp_proto;
870
871 err = proto_register(&udplitev6_prot, 1);
872 if (err)
873 goto out_unregister_udp_proto;
874
875 err = proto_register(&rawv6_prot, 1);
876 if (err)
877 goto out_unregister_udplite_proto;
878
879 err = proto_register(&pingv6_prot, 1);
880 if (err)
881 goto out_unregister_ping_proto;
882
883 /* We MUST register RAW sockets before we create the ICMP6,
884 * IGMP6, or NDISC control sockets.
885 */
886 err = rawv6_init();
887 if (err)
888 goto out_unregister_raw_proto;
889
890 /* Register the family here so that the init calls below will
891 * be able to create sockets. (?? is this dangerous ??)
892 */
893 err = sock_register(&inet6_family_ops);
894 if (err)
895 goto out_sock_register_fail;
896
897 /*
898 * ipngwg API draft makes clear that the correct semantics
899 * for TCP and UDP is to consider one TCP and UDP instance
900 * in a host available by both INET and INET6 APIs and
901 * able to communicate via both network protocols.
902 */
903
904 err = register_pernet_subsys(&inet6_net_ops);
905 if (err)
906 goto register_pernet_fail;
907 err = ip6_mr_init();
908 if (err)
909 goto ipmr_fail;
910 err = icmpv6_init();
911 if (err)
912 goto icmp_fail;
913 err = ndisc_init();
914 if (err)
915 goto ndisc_fail;
916 err = igmp6_init();
917 if (err)
918 goto igmp_fail;
919
920 ipv6_stub = &ipv6_stub_impl;
921
922 err = ipv6_netfilter_init();
923 if (err)
924 goto netfilter_fail;
925 /* Create /proc/foo6 entries. */
926 #ifdef CONFIG_PROC_FS
927 err = -ENOMEM;
928 if (raw6_proc_init())
929 goto proc_raw6_fail;
930 if (udplite6_proc_init())
931 goto proc_udplite6_fail;
932 if (ipv6_misc_proc_init())
933 goto proc_misc6_fail;
934 if (if6_proc_init())
935 goto proc_if6_fail;
936 #endif
937 err = ip6_route_init();
938 if (err)
939 goto ip6_route_fail;
940 err = ndisc_late_init();
941 if (err)
942 goto ndisc_late_fail;
943 err = ip6_flowlabel_init();
944 if (err)
945 goto ip6_flowlabel_fail;
946 err = addrconf_init();
947 if (err)
948 goto addrconf_fail;
949
950 /* Init v6 extension headers. */
951 err = ipv6_exthdrs_init();
952 if (err)
953 goto ipv6_exthdrs_fail;
954
955 err = ipv6_frag_init();
956 if (err)
957 goto ipv6_frag_fail;
958
959 /* Init v6 transport protocols. */
960 err = udpv6_init();
961 if (err)
962 goto udpv6_fail;
963
964 err = udplitev6_init();
965 if (err)
966 goto udplitev6_fail;
967
968 err = tcpv6_init();
969 if (err)
970 goto tcpv6_fail;
971
972 err = ipv6_packet_init();
973 if (err)
974 goto ipv6_packet_fail;
975
976 err = pingv6_init();
977 if (err)
978 goto pingv6_fail;
979
980 #ifdef CONFIG_SYSCTL
981 err = ipv6_sysctl_register();
982 if (err)
983 goto sysctl_fail;
984 #endif
985 out:
986 return err;
987
988 #ifdef CONFIG_SYSCTL
989 sysctl_fail:
990 pingv6_exit();
991 #endif
992 pingv6_fail:
993 ipv6_packet_cleanup();
994 ipv6_packet_fail:
995 tcpv6_exit();
996 tcpv6_fail:
997 udplitev6_exit();
998 udplitev6_fail:
999 udpv6_exit();
1000 udpv6_fail:
1001 ipv6_frag_exit();
1002 ipv6_frag_fail:
1003 ipv6_exthdrs_exit();
1004 ipv6_exthdrs_fail:
1005 addrconf_cleanup();
1006 addrconf_fail:
1007 ip6_flowlabel_cleanup();
1008 ip6_flowlabel_fail:
1009 ndisc_late_cleanup();
1010 ndisc_late_fail:
1011 ip6_route_cleanup();
1012 ip6_route_fail:
1013 #ifdef CONFIG_PROC_FS
1014 if6_proc_exit();
1015 proc_if6_fail:
1016 ipv6_misc_proc_exit();
1017 proc_misc6_fail:
1018 udplite6_proc_exit();
1019 proc_udplite6_fail:
1020 raw6_proc_exit();
1021 proc_raw6_fail:
1022 #endif
1023 ipv6_netfilter_fini();
1024 netfilter_fail:
1025 igmp6_cleanup();
1026 igmp_fail:
1027 ndisc_cleanup();
1028 ndisc_fail:
1029 ip6_mr_cleanup();
1030 icmp_fail:
1031 unregister_pernet_subsys(&inet6_net_ops);
1032 ipmr_fail:
1033 icmpv6_cleanup();
1034 register_pernet_fail:
1035 sock_unregister(PF_INET6);
1036 rtnl_unregister_all(PF_INET6);
1037 out_sock_register_fail:
1038 rawv6_exit();
1039 out_unregister_ping_proto:
1040 proto_unregister(&pingv6_prot);
1041 out_unregister_raw_proto:
1042 proto_unregister(&rawv6_prot);
1043 out_unregister_udplite_proto:
1044 proto_unregister(&udplitev6_prot);
1045 out_unregister_udp_proto:
1046 proto_unregister(&udpv6_prot);
1047 out_unregister_tcp_proto:
1048 proto_unregister(&tcpv6_prot);
1049 goto out;
1050 }
1051 module_init(inet6_init);
1052
1053 MODULE_ALIAS_NETPROTO(PF_INET6);
1054