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 #ifdef CONFIG_IPV6_TUNNEL
60 #include <net/ip6_tunnel.h>
61 #endif
62
63 #include <asm/uaccess.h>
64 #include <linux/mroute6.h>
65
66 #ifdef CONFIG_ANDROID_PARANOID_NETWORK
67 #include <linux/android_aid.h>
68
current_has_network(void)69 static inline int current_has_network(void)
70 {
71 return in_egroup_p(AID_INET) || capable(CAP_NET_RAW);
72 }
73 #else
current_has_network(void)74 static inline int current_has_network(void)
75 {
76 return 1;
77 }
78 #endif
79
80 MODULE_AUTHOR("Cast of dozens");
81 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
82 MODULE_LICENSE("GPL");
83
84 /* The inetsw6 table contains everything that inet6_create needs to
85 * build a new socket.
86 */
87 static struct list_head inetsw6[SOCK_MAX];
88 static DEFINE_SPINLOCK(inetsw6_lock);
89
90 struct ipv6_params ipv6_defaults = {
91 .disable_ipv6 = 0,
92 .autoconf = 1,
93 };
94
95 static int disable_ipv6_mod;
96
97 module_param_named(disable, disable_ipv6_mod, int, 0444);
98 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
99
100 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
101 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
102
103 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
104 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
105
inet6_sk_generic(struct sock * sk)106 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
107 {
108 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
109
110 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
111 }
112
inet6_create(struct net * net,struct socket * sock,int protocol,int kern)113 static int inet6_create(struct net *net, struct socket *sock, int protocol,
114 int kern)
115 {
116 struct inet_sock *inet;
117 struct ipv6_pinfo *np;
118 struct sock *sk;
119 struct inet_protosw *answer;
120 struct proto *answer_prot;
121 unsigned char answer_flags;
122 char answer_no_check;
123 int try_loading_module = 0;
124 int err;
125
126 if (!current_has_network())
127 return -EACCES;
128
129 if (sock->type != SOCK_RAW &&
130 sock->type != SOCK_DGRAM &&
131 !inet_ehash_secret)
132 build_ehash_secret();
133
134 /* Look for the requested type/protocol pair. */
135 lookup_protocol:
136 err = -ESOCKTNOSUPPORT;
137 rcu_read_lock();
138 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
139
140 err = 0;
141 /* Check the non-wild match. */
142 if (protocol == answer->protocol) {
143 if (protocol != IPPROTO_IP)
144 break;
145 } else {
146 /* Check for the two wild cases. */
147 if (IPPROTO_IP == protocol) {
148 protocol = answer->protocol;
149 break;
150 }
151 if (IPPROTO_IP == answer->protocol)
152 break;
153 }
154 err = -EPROTONOSUPPORT;
155 }
156
157 if (err) {
158 if (try_loading_module < 2) {
159 rcu_read_unlock();
160 /*
161 * Be more specific, e.g. net-pf-10-proto-132-type-1
162 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
163 */
164 if (++try_loading_module == 1)
165 request_module("net-pf-%d-proto-%d-type-%d",
166 PF_INET6, protocol, sock->type);
167 /*
168 * Fall back to generic, e.g. net-pf-10-proto-132
169 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
170 */
171 else
172 request_module("net-pf-%d-proto-%d",
173 PF_INET6, protocol);
174 goto lookup_protocol;
175 } else
176 goto out_rcu_unlock;
177 }
178
179 err = -EPERM;
180 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
181 goto out_rcu_unlock;
182
183 sock->ops = answer->ops;
184 answer_prot = answer->prot;
185 answer_no_check = answer->no_check;
186 answer_flags = answer->flags;
187 rcu_read_unlock();
188
189 WARN_ON(answer_prot->slab == NULL);
190
191 err = -ENOBUFS;
192 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
193 if (sk == NULL)
194 goto out;
195
196 sock_init_data(sock, sk);
197
198 err = 0;
199 sk->sk_no_check = answer_no_check;
200 if (INET_PROTOSW_REUSE & answer_flags)
201 sk->sk_reuse = SK_CAN_REUSE;
202
203 inet = inet_sk(sk);
204 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
205
206 if (SOCK_RAW == sock->type) {
207 inet->inet_num = protocol;
208 if (IPPROTO_RAW == protocol)
209 inet->hdrincl = 1;
210 }
211
212 sk->sk_destruct = inet_sock_destruct;
213 sk->sk_family = PF_INET6;
214 sk->sk_protocol = protocol;
215
216 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
217
218 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
219 np->hop_limit = -1;
220 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
221 np->mc_loop = 1;
222 np->pmtudisc = IPV6_PMTUDISC_WANT;
223 np->ipv6only = net->ipv6.sysctl.bindv6only;
224
225 /* Init the ipv4 part of the socket since we can have sockets
226 * using v6 API for ipv4.
227 */
228 inet->uc_ttl = -1;
229
230 inet->mc_loop = 1;
231 inet->mc_ttl = 1;
232 inet->mc_index = 0;
233 inet->mc_list = NULL;
234 inet->rcv_tos = 0;
235
236 if (ipv4_config.no_pmtu_disc)
237 inet->pmtudisc = IP_PMTUDISC_DONT;
238 else
239 inet->pmtudisc = IP_PMTUDISC_WANT;
240 /*
241 * Increment only the relevant sk_prot->socks debug field, this changes
242 * the previous behaviour of incrementing both the equivalent to
243 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
244 *
245 * This allows better debug granularity as we'll know exactly how many
246 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
247 * transport protocol socks. -acme
248 */
249 sk_refcnt_debug_inc(sk);
250
251 if (inet->inet_num) {
252 /* It assumes that any protocol which allows
253 * the user to assign a number at socket
254 * creation time automatically shares.
255 */
256 inet->inet_sport = htons(inet->inet_num);
257 sk->sk_prot->hash(sk);
258 }
259 if (sk->sk_prot->init) {
260 err = sk->sk_prot->init(sk);
261 if (err) {
262 sk_common_release(sk);
263 goto out;
264 }
265 }
266 out:
267 return err;
268 out_rcu_unlock:
269 rcu_read_unlock();
270 goto out;
271 }
272
273
274 /* bind for INET6 API */
inet6_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)275 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
276 {
277 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
278 struct sock *sk = sock->sk;
279 struct inet_sock *inet = inet_sk(sk);
280 struct ipv6_pinfo *np = inet6_sk(sk);
281 struct net *net = sock_net(sk);
282 __be32 v4addr = 0;
283 unsigned short snum;
284 int addr_type = 0;
285 int err = 0;
286
287 /* If the socket has its own bind function then use it. */
288 if (sk->sk_prot->bind)
289 return sk->sk_prot->bind(sk, uaddr, addr_len);
290
291 if (addr_len < SIN6_LEN_RFC2133)
292 return -EINVAL;
293
294 if (addr->sin6_family != AF_INET6)
295 return -EAFNOSUPPORT;
296
297 addr_type = ipv6_addr_type(&addr->sin6_addr);
298 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
299 return -EINVAL;
300
301 snum = ntohs(addr->sin6_port);
302 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
303 return -EACCES;
304
305 lock_sock(sk);
306
307 /* Check these errors (active socket, double bind). */
308 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
309 err = -EINVAL;
310 goto out;
311 }
312
313 /* Check if the address belongs to the host. */
314 if (addr_type == IPV6_ADDR_MAPPED) {
315 int chk_addr_ret;
316
317 /* Binding to v4-mapped address on a v6-only socket
318 * makes no sense
319 */
320 if (np->ipv6only) {
321 err = -EINVAL;
322 goto out;
323 }
324
325 /* Reproduce AF_INET checks to make the bindings consistent */
326 v4addr = addr->sin6_addr.s6_addr32[3];
327 chk_addr_ret = inet_addr_type(net, v4addr);
328 if (!sysctl_ip_nonlocal_bind &&
329 !(inet->freebind || inet->transparent) &&
330 v4addr != htonl(INADDR_ANY) &&
331 chk_addr_ret != RTN_LOCAL &&
332 chk_addr_ret != RTN_MULTICAST &&
333 chk_addr_ret != RTN_BROADCAST) {
334 err = -EADDRNOTAVAIL;
335 goto out;
336 }
337 } else {
338 if (addr_type != IPV6_ADDR_ANY) {
339 struct net_device *dev = NULL;
340
341 rcu_read_lock();
342 if (__ipv6_addr_needs_scope_id(addr_type)) {
343 if (addr_len >= sizeof(struct sockaddr_in6) &&
344 addr->sin6_scope_id) {
345 /* Override any existing binding, if another one
346 * is supplied by user.
347 */
348 sk->sk_bound_dev_if = addr->sin6_scope_id;
349 }
350
351 /* Binding to link-local address requires an interface */
352 if (!sk->sk_bound_dev_if) {
353 err = -EINVAL;
354 goto out_unlock;
355 }
356 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
357 if (!dev) {
358 err = -ENODEV;
359 goto out_unlock;
360 }
361 }
362
363 /* ipv4 addr of the socket is invalid. Only the
364 * unspecified and mapped address have a v4 equivalent.
365 */
366 v4addr = LOOPBACK4_IPV6;
367 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
368 if (!(inet->freebind || inet->transparent) &&
369 !ipv6_chk_addr(net, &addr->sin6_addr,
370 dev, 0)) {
371 err = -EADDRNOTAVAIL;
372 goto out_unlock;
373 }
374 }
375 rcu_read_unlock();
376 }
377 }
378
379 inet->inet_rcv_saddr = v4addr;
380 inet->inet_saddr = v4addr;
381
382 np->rcv_saddr = addr->sin6_addr;
383
384 if (!(addr_type & IPV6_ADDR_MULTICAST))
385 np->saddr = addr->sin6_addr;
386
387 /* Make sure we are allowed to bind here. */
388 if (sk->sk_prot->get_port(sk, snum)) {
389 inet_reset_saddr(sk);
390 err = -EADDRINUSE;
391 goto out;
392 }
393
394 if (addr_type != IPV6_ADDR_ANY) {
395 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
396 if (addr_type != IPV6_ADDR_MAPPED)
397 np->ipv6only = 1;
398 }
399 if (snum)
400 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
401 inet->inet_sport = htons(inet->inet_num);
402 inet->inet_dport = 0;
403 inet->inet_daddr = 0;
404 out:
405 release_sock(sk);
406 return err;
407 out_unlock:
408 rcu_read_unlock();
409 goto out;
410 }
411 EXPORT_SYMBOL(inet6_bind);
412
inet6_release(struct socket * sock)413 int inet6_release(struct socket *sock)
414 {
415 struct sock *sk = sock->sk;
416
417 if (sk == NULL)
418 return -EINVAL;
419
420 /* Free mc lists */
421 ipv6_sock_mc_close(sk);
422
423 /* Free ac lists */
424 ipv6_sock_ac_close(sk);
425
426 return inet_release(sock);
427 }
428 EXPORT_SYMBOL(inet6_release);
429
inet6_destroy_sock(struct sock * sk)430 void inet6_destroy_sock(struct sock *sk)
431 {
432 struct ipv6_pinfo *np = inet6_sk(sk);
433 struct sk_buff *skb;
434 struct ipv6_txoptions *opt;
435
436 /* Release rx options */
437
438 skb = xchg(&np->pktoptions, NULL);
439 if (skb != NULL)
440 kfree_skb(skb);
441
442 skb = xchg(&np->rxpmtu, NULL);
443 if (skb != NULL)
444 kfree_skb(skb);
445
446 /* Free flowlabels */
447 fl6_free_socklist(sk);
448
449 /* Free tx options */
450
451 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
452 if (opt) {
453 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
454 txopt_put(opt);
455 }
456 }
457 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
458
459 /*
460 * This does both peername and sockname.
461 */
462
inet6_getname(struct socket * sock,struct sockaddr * uaddr,int * uaddr_len,int peer)463 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
464 int *uaddr_len, int peer)
465 {
466 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
467 struct sock *sk = sock->sk;
468 struct inet_sock *inet = inet_sk(sk);
469 struct ipv6_pinfo *np = inet6_sk(sk);
470
471 sin->sin6_family = AF_INET6;
472 sin->sin6_flowinfo = 0;
473 sin->sin6_scope_id = 0;
474 if (peer) {
475 if (!inet->inet_dport)
476 return -ENOTCONN;
477 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
478 peer == 1)
479 return -ENOTCONN;
480 sin->sin6_port = inet->inet_dport;
481 sin->sin6_addr = np->daddr;
482 if (np->sndflow)
483 sin->sin6_flowinfo = np->flow_label;
484 } else {
485 if (ipv6_addr_any(&np->rcv_saddr))
486 sin->sin6_addr = np->saddr;
487 else
488 sin->sin6_addr = np->rcv_saddr;
489
490 sin->sin6_port = inet->inet_sport;
491 }
492 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
493 sk->sk_bound_dev_if);
494 *uaddr_len = sizeof(*sin);
495 return 0;
496 }
497 EXPORT_SYMBOL(inet6_getname);
498
inet6_killaddr_ioctl(struct net * net,void __user * arg)499 int inet6_killaddr_ioctl(struct net *net, void __user *arg) {
500 struct in6_ifreq ireq;
501 struct sockaddr_in6 sin6;
502
503 if (!capable(CAP_NET_ADMIN))
504 return -EACCES;
505
506 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
507 return -EFAULT;
508
509 sin6.sin6_family = AF_INET6;
510 sin6.sin6_addr = ireq.ifr6_addr;
511 return tcp_nuke_addr(net, (struct sockaddr *) &sin6);
512 }
513
inet6_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)514 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
515 {
516 struct sock *sk = sock->sk;
517 struct net *net = sock_net(sk);
518
519 switch (cmd) {
520 case SIOCGSTAMP:
521 return sock_get_timestamp(sk, (struct timeval __user *)arg);
522
523 case SIOCGSTAMPNS:
524 return sock_get_timestampns(sk, (struct timespec __user *)arg);
525
526 case SIOCADDRT:
527 case SIOCDELRT:
528
529 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
530
531 case SIOCSIFADDR:
532 return addrconf_add_ifaddr(net, (void __user *) arg);
533 case SIOCDIFADDR:
534 return addrconf_del_ifaddr(net, (void __user *) arg);
535 case SIOCSIFDSTADDR:
536 return addrconf_set_dstaddr(net, (void __user *) arg);
537 case SIOCKILLADDR:
538 return inet6_killaddr_ioctl(net, (void __user *) arg);
539 default:
540 if (!sk->sk_prot->ioctl)
541 return -ENOIOCTLCMD;
542 return sk->sk_prot->ioctl(sk, cmd, arg);
543 }
544 /*NOTREACHED*/
545 return 0;
546 }
547 EXPORT_SYMBOL(inet6_ioctl);
548
549 const struct proto_ops inet6_stream_ops = {
550 .family = PF_INET6,
551 .owner = THIS_MODULE,
552 .release = inet6_release,
553 .bind = inet6_bind,
554 .connect = inet_stream_connect, /* ok */
555 .socketpair = sock_no_socketpair, /* a do nothing */
556 .accept = inet_accept, /* ok */
557 .getname = inet6_getname,
558 .poll = tcp_poll, /* ok */
559 .ioctl = inet6_ioctl, /* must change */
560 .listen = inet_listen, /* ok */
561 .shutdown = inet_shutdown, /* ok */
562 .setsockopt = sock_common_setsockopt, /* ok */
563 .getsockopt = sock_common_getsockopt, /* ok */
564 .sendmsg = inet_sendmsg, /* ok */
565 .recvmsg = inet_recvmsg, /* ok */
566 .mmap = sock_no_mmap,
567 .sendpage = inet_sendpage,
568 .splice_read = tcp_splice_read,
569 #ifdef CONFIG_COMPAT
570 .compat_setsockopt = compat_sock_common_setsockopt,
571 .compat_getsockopt = compat_sock_common_getsockopt,
572 #endif
573 };
574
575 const struct proto_ops inet6_dgram_ops = {
576 .family = PF_INET6,
577 .owner = THIS_MODULE,
578 .release = inet6_release,
579 .bind = inet6_bind,
580 .connect = inet_dgram_connect, /* ok */
581 .socketpair = sock_no_socketpair, /* a do nothing */
582 .accept = sock_no_accept, /* a do nothing */
583 .getname = inet6_getname,
584 .poll = udp_poll, /* ok */
585 .ioctl = inet6_ioctl, /* must change */
586 .listen = sock_no_listen, /* ok */
587 .shutdown = inet_shutdown, /* ok */
588 .setsockopt = sock_common_setsockopt, /* ok */
589 .getsockopt = sock_common_getsockopt, /* ok */
590 .sendmsg = inet_sendmsg, /* ok */
591 .recvmsg = inet_recvmsg, /* ok */
592 .mmap = sock_no_mmap,
593 .sendpage = sock_no_sendpage,
594 #ifdef CONFIG_COMPAT
595 .compat_setsockopt = compat_sock_common_setsockopt,
596 .compat_getsockopt = compat_sock_common_getsockopt,
597 #endif
598 };
599
600 static const struct net_proto_family inet6_family_ops = {
601 .family = PF_INET6,
602 .create = inet6_create,
603 .owner = THIS_MODULE,
604 };
605
inet6_register_protosw(struct inet_protosw * p)606 int inet6_register_protosw(struct inet_protosw *p)
607 {
608 struct list_head *lh;
609 struct inet_protosw *answer;
610 struct list_head *last_perm;
611 int protocol = p->protocol;
612 int ret;
613
614 spin_lock_bh(&inetsw6_lock);
615
616 ret = -EINVAL;
617 if (p->type >= SOCK_MAX)
618 goto out_illegal;
619
620 /* If we are trying to override a permanent protocol, bail. */
621 answer = NULL;
622 ret = -EPERM;
623 last_perm = &inetsw6[p->type];
624 list_for_each(lh, &inetsw6[p->type]) {
625 answer = list_entry(lh, struct inet_protosw, list);
626
627 /* Check only the non-wild match. */
628 if (INET_PROTOSW_PERMANENT & answer->flags) {
629 if (protocol == answer->protocol)
630 break;
631 last_perm = lh;
632 }
633
634 answer = NULL;
635 }
636 if (answer)
637 goto out_permanent;
638
639 /* Add the new entry after the last permanent entry if any, so that
640 * the new entry does not override a permanent entry when matched with
641 * a wild-card protocol. But it is allowed to override any existing
642 * non-permanent entry. This means that when we remove this entry, the
643 * system automatically returns to the old behavior.
644 */
645 list_add_rcu(&p->list, last_perm);
646 ret = 0;
647 out:
648 spin_unlock_bh(&inetsw6_lock);
649 return ret;
650
651 out_permanent:
652 pr_err("Attempt to override permanent protocol %d\n", protocol);
653 goto out;
654
655 out_illegal:
656 pr_err("Ignoring attempt to register invalid socket type %d\n",
657 p->type);
658 goto out;
659 }
660 EXPORT_SYMBOL(inet6_register_protosw);
661
662 void
inet6_unregister_protosw(struct inet_protosw * p)663 inet6_unregister_protosw(struct inet_protosw *p)
664 {
665 if (INET_PROTOSW_PERMANENT & p->flags) {
666 pr_err("Attempt to unregister permanent protocol %d\n",
667 p->protocol);
668 } else {
669 spin_lock_bh(&inetsw6_lock);
670 list_del_rcu(&p->list);
671 spin_unlock_bh(&inetsw6_lock);
672
673 synchronize_net();
674 }
675 }
676 EXPORT_SYMBOL(inet6_unregister_protosw);
677
inet6_sk_rebuild_header(struct sock * sk)678 int inet6_sk_rebuild_header(struct sock *sk)
679 {
680 struct ipv6_pinfo *np = inet6_sk(sk);
681 struct dst_entry *dst;
682
683 dst = __sk_dst_check(sk, np->dst_cookie);
684
685 if (dst == NULL) {
686 struct inet_sock *inet = inet_sk(sk);
687 struct in6_addr *final_p, final;
688 struct flowi6 fl6;
689
690 memset(&fl6, 0, sizeof(fl6));
691 fl6.flowi6_proto = sk->sk_protocol;
692 fl6.daddr = np->daddr;
693 fl6.saddr = np->saddr;
694 fl6.flowlabel = np->flow_label;
695 fl6.flowi6_oif = sk->sk_bound_dev_if;
696 fl6.flowi6_mark = sk->sk_mark;
697 fl6.fl6_dport = inet->inet_dport;
698 fl6.fl6_sport = inet->inet_sport;
699 fl6.flowi6_uid = sk->sk_uid;
700 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
701
702 rcu_read_lock();
703 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
704 &final);
705 rcu_read_unlock();
706
707 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
708 if (IS_ERR(dst)) {
709 sk->sk_route_caps = 0;
710 sk->sk_err_soft = -PTR_ERR(dst);
711 return PTR_ERR(dst);
712 }
713
714 __ip6_dst_store(sk, dst, NULL, NULL);
715 }
716
717 return 0;
718 }
719 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
720
ipv6_opt_accepted(const struct sock * sk,const struct sk_buff * skb)721 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb)
722 {
723 const struct ipv6_pinfo *np = inet6_sk(sk);
724 const struct inet6_skb_parm *opt = IP6CB(skb);
725
726 if (np->rxopt.all) {
727 if ((opt->hop && (np->rxopt.bits.hopopts ||
728 np->rxopt.bits.ohopopts)) ||
729 ((IPV6_FLOWINFO_MASK &
730 *(__be32 *)skb_network_header(skb)) &&
731 np->rxopt.bits.rxflow) ||
732 (opt->srcrt && (np->rxopt.bits.srcrt ||
733 np->rxopt.bits.osrcrt)) ||
734 ((opt->dst1 || opt->dst0) &&
735 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
736 return true;
737 }
738 return false;
739 }
740 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
741
742 static struct packet_type ipv6_packet_type __read_mostly = {
743 .type = cpu_to_be16(ETH_P_IPV6),
744 .func = ipv6_rcv,
745 };
746
ipv6_packet_init(void)747 static int __init ipv6_packet_init(void)
748 {
749 dev_add_pack(&ipv6_packet_type);
750 return 0;
751 }
752
ipv6_packet_cleanup(void)753 static void ipv6_packet_cleanup(void)
754 {
755 dev_remove_pack(&ipv6_packet_type);
756 }
757
ipv6_init_mibs(struct net * net)758 static int __net_init ipv6_init_mibs(struct net *net)
759 {
760 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
761 sizeof(struct udp_mib),
762 __alignof__(struct udp_mib)) < 0)
763 return -ENOMEM;
764 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
765 sizeof(struct udp_mib),
766 __alignof__(struct udp_mib)) < 0)
767 goto err_udplite_mib;
768 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
769 sizeof(struct ipstats_mib),
770 __alignof__(struct ipstats_mib)) < 0)
771 goto err_ip_mib;
772 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
773 sizeof(struct icmpv6_mib),
774 __alignof__(struct icmpv6_mib)) < 0)
775 goto err_icmp_mib;
776 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
777 GFP_KERNEL);
778 if (!net->mib.icmpv6msg_statistics)
779 goto err_icmpmsg_mib;
780 return 0;
781
782 err_icmpmsg_mib:
783 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
784 err_icmp_mib:
785 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
786 err_ip_mib:
787 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
788 err_udplite_mib:
789 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
790 return -ENOMEM;
791 }
792
ipv6_cleanup_mibs(struct net * net)793 static void ipv6_cleanup_mibs(struct net *net)
794 {
795 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
796 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
797 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
798 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
799 kfree(net->mib.icmpv6msg_statistics);
800 }
801
inet6_net_init(struct net * net)802 static int __net_init inet6_net_init(struct net *net)
803 {
804 int err = 0;
805
806 net->ipv6.sysctl.bindv6only = 0;
807 net->ipv6.sysctl.icmpv6_time = 1*HZ;
808
809 err = ipv6_init_mibs(net);
810 if (err)
811 return err;
812 #ifdef CONFIG_PROC_FS
813 err = udp6_proc_init(net);
814 if (err)
815 goto out;
816 err = tcp6_proc_init(net);
817 if (err)
818 goto proc_tcp6_fail;
819 err = ac6_proc_init(net);
820 if (err)
821 goto proc_ac6_fail;
822 #endif
823 return err;
824
825 #ifdef CONFIG_PROC_FS
826 proc_ac6_fail:
827 tcp6_proc_exit(net);
828 proc_tcp6_fail:
829 udp6_proc_exit(net);
830 out:
831 ipv6_cleanup_mibs(net);
832 return err;
833 #endif
834 }
835
inet6_net_exit(struct net * net)836 static void __net_exit inet6_net_exit(struct net *net)
837 {
838 #ifdef CONFIG_PROC_FS
839 udp6_proc_exit(net);
840 tcp6_proc_exit(net);
841 ac6_proc_exit(net);
842 #endif
843 ipv6_cleanup_mibs(net);
844 }
845
846 static struct pernet_operations inet6_net_ops = {
847 .init = inet6_net_init,
848 .exit = inet6_net_exit,
849 };
850
inet6_init(void)851 static int __init inet6_init(void)
852 {
853 struct list_head *r;
854 int err = 0;
855
856 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
857
858 /* Register the socket-side information for inet6_create. */
859 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
860 INIT_LIST_HEAD(r);
861
862 if (disable_ipv6_mod) {
863 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
864 goto out;
865 }
866
867 err = proto_register(&tcpv6_prot, 1);
868 if (err)
869 goto out;
870
871 err = proto_register(&udpv6_prot, 1);
872 if (err)
873 goto out_unregister_tcp_proto;
874
875 err = proto_register(&udplitev6_prot, 1);
876 if (err)
877 goto out_unregister_udp_proto;
878
879 err = proto_register(&rawv6_prot, 1);
880 if (err)
881 goto out_unregister_udplite_proto;
882
883 err = proto_register(&pingv6_prot, 1);
884 if (err)
885 goto out_unregister_ping_proto;
886
887 /* We MUST register RAW sockets before we create the ICMP6,
888 * IGMP6, or NDISC control sockets.
889 */
890 err = rawv6_init();
891 if (err)
892 goto out_unregister_raw_proto;
893
894 /* Register the family here so that the init calls below will
895 * be able to create sockets. (?? is this dangerous ??)
896 */
897 err = sock_register(&inet6_family_ops);
898 if (err)
899 goto out_sock_register_fail;
900
901 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
902
903 /*
904 * ipngwg API draft makes clear that the correct semantics
905 * for TCP and UDP is to consider one TCP and UDP instance
906 * in a host available by both INET and INET6 APIs and
907 * able to communicate via both network protocols.
908 */
909
910 err = register_pernet_subsys(&inet6_net_ops);
911 if (err)
912 goto register_pernet_fail;
913 err = icmpv6_init();
914 if (err)
915 goto icmp_fail;
916 err = ip6_mr_init();
917 if (err)
918 goto ipmr_fail;
919 err = ndisc_init();
920 if (err)
921 goto ndisc_fail;
922 err = igmp6_init();
923 if (err)
924 goto igmp_fail;
925 err = ipv6_netfilter_init();
926 if (err)
927 goto netfilter_fail;
928 /* Create /proc/foo6 entries. */
929 #ifdef CONFIG_PROC_FS
930 err = -ENOMEM;
931 if (raw6_proc_init())
932 goto proc_raw6_fail;
933 if (udplite6_proc_init())
934 goto proc_udplite6_fail;
935 if (ipv6_misc_proc_init())
936 goto proc_misc6_fail;
937 if (if6_proc_init())
938 goto proc_if6_fail;
939 #endif
940 err = ip6_route_init();
941 if (err)
942 goto ip6_route_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 ipv6_packet_cleanup();
991 #endif
992 pingv6_fail:
993 pingv6_exit();
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 ip6_route_cleanup();
1010 ip6_route_fail:
1011 #ifdef CONFIG_PROC_FS
1012 if6_proc_exit();
1013 proc_if6_fail:
1014 ipv6_misc_proc_exit();
1015 proc_misc6_fail:
1016 udplite6_proc_exit();
1017 proc_udplite6_fail:
1018 raw6_proc_exit();
1019 proc_raw6_fail:
1020 #endif
1021 ipv6_netfilter_fini();
1022 netfilter_fail:
1023 igmp6_cleanup();
1024 igmp_fail:
1025 ndisc_cleanup();
1026 ndisc_fail:
1027 ip6_mr_cleanup();
1028 ipmr_fail:
1029 icmpv6_cleanup();
1030 icmp_fail:
1031 unregister_pernet_subsys(&inet6_net_ops);
1032 register_pernet_fail:
1033 sock_unregister(PF_INET6);
1034 rtnl_unregister_all(PF_INET6);
1035 out_sock_register_fail:
1036 rawv6_exit();
1037 out_unregister_ping_proto:
1038 proto_unregister(&pingv6_prot);
1039 out_unregister_raw_proto:
1040 proto_unregister(&rawv6_prot);
1041 out_unregister_udplite_proto:
1042 proto_unregister(&udplitev6_prot);
1043 out_unregister_udp_proto:
1044 proto_unregister(&udpv6_prot);
1045 out_unregister_tcp_proto:
1046 proto_unregister(&tcpv6_prot);
1047 goto out;
1048 }
1049 module_init(inet6_init);
1050
inet6_exit(void)1051 static void __exit inet6_exit(void)
1052 {
1053 if (disable_ipv6_mod)
1054 return;
1055
1056 /* First of all disallow new sockets creation. */
1057 sock_unregister(PF_INET6);
1058 /* Disallow any further netlink messages */
1059 rtnl_unregister_all(PF_INET6);
1060
1061 udpv6_exit();
1062 udplitev6_exit();
1063 tcpv6_exit();
1064
1065 /* Cleanup code parts. */
1066 ipv6_packet_cleanup();
1067 ipv6_frag_exit();
1068 ipv6_exthdrs_exit();
1069 addrconf_cleanup();
1070 ip6_flowlabel_cleanup();
1071 ip6_route_cleanup();
1072 #ifdef CONFIG_PROC_FS
1073
1074 /* Cleanup code parts. */
1075 if6_proc_exit();
1076 ipv6_misc_proc_exit();
1077 udplite6_proc_exit();
1078 raw6_proc_exit();
1079 #endif
1080 ipv6_netfilter_fini();
1081 igmp6_cleanup();
1082 ndisc_cleanup();
1083 ip6_mr_cleanup();
1084 icmpv6_cleanup();
1085 rawv6_exit();
1086
1087 unregister_pernet_subsys(&inet6_net_ops);
1088 proto_unregister(&rawv6_prot);
1089 proto_unregister(&udplitev6_prot);
1090 proto_unregister(&udpv6_prot);
1091 proto_unregister(&tcpv6_prot);
1092
1093 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1094 }
1095 module_exit(inet6_exit);
1096
1097 MODULE_ALIAS_NETPROTO(PF_INET6);
1098