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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
[mirror_ubuntu-eoan-kernel.git] / net / ipv6 / af_inet6.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * PF_INET6 socket protocol family
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Adapted from linux/net/ipv4/af_inet.c
10 *
11 * Fixes:
12 * piggy, Karl Knutson : Socket protocol table
13 * Hideaki YOSHIFUJI : sin6_scope_id support
14 * Arnaldo Melo : check proc_net_create return, cleanups
15 */
16
17 #define pr_fmt(fmt) "IPv6: " fmt
18
19 #include <linux/module.h>
20 #include <linux/capability.h>
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/in.h>
25 #include <linux/kernel.h>
26 #include <linux/timer.h>
27 #include <linux/string.h>
28 #include <linux/sockios.h>
29 #include <linux/net.h>
30 #include <linux/fcntl.h>
31 #include <linux/mm.h>
32 #include <linux/interrupt.h>
33 #include <linux/proc_fs.h>
34 #include <linux/stat.h>
35 #include <linux/init.h>
36 #include <linux/slab.h>
37
38 #include <linux/inet.h>
39 #include <linux/netdevice.h>
40 #include <linux/icmpv6.h>
41 #include <linux/netfilter_ipv6.h>
42
43 #include <net/ip.h>
44 #include <net/ipv6.h>
45 #include <net/udp.h>
46 #include <net/udplite.h>
47 #include <net/tcp.h>
48 #include <net/ping.h>
49 #include <net/protocol.h>
50 #include <net/inet_common.h>
51 #include <net/route.h>
52 #include <net/transp_v6.h>
53 #include <net/ip6_route.h>
54 #include <net/addrconf.h>
55 #include <net/ipv6_stubs.h>
56 #include <net/ndisc.h>
57 #ifdef CONFIG_IPV6_TUNNEL
58 #include <net/ip6_tunnel.h>
59 #endif
60 #include <net/calipso.h>
61 #include <net/seg6.h>
62
63 #include <linux/uaccess.h>
64 #include <linux/mroute6.h>
65
66 #include "ip6_offload.h"
67
68 MODULE_AUTHOR("Cast of dozens");
69 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
70 MODULE_LICENSE("GPL");
71
72 /* The inetsw6 table contains everything that inet6_create needs to
73 * build a new socket.
74 */
75 static struct list_head inetsw6[SOCK_MAX];
76 static DEFINE_SPINLOCK(inetsw6_lock);
77
78 struct ipv6_params ipv6_defaults = {
79 .disable_ipv6 = 0,
80 .autoconf = 1,
81 };
82
83 static int disable_ipv6_mod;
84
85 module_param_named(disable, disable_ipv6_mod, int, 0444);
86 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
87
88 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
89 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
90
91 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
92 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
93
94 bool ipv6_mod_enabled(void)
95 {
96 return disable_ipv6_mod == 0;
97 }
98 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
99
100 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
101 {
102 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
103
104 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
105 }
106
107 static int inet6_create(struct net *net, struct socket *sock, int protocol,
108 int kern)
109 {
110 struct inet_sock *inet;
111 struct ipv6_pinfo *np;
112 struct sock *sk;
113 struct inet_protosw *answer;
114 struct proto *answer_prot;
115 unsigned char answer_flags;
116 int try_loading_module = 0;
117 int err;
118
119 if (protocol < 0 || protocol >= IPPROTO_MAX)
120 return -EINVAL;
121
122 /* Look for the requested type/protocol pair. */
123 lookup_protocol:
124 err = -ESOCKTNOSUPPORT;
125 rcu_read_lock();
126 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
127
128 err = 0;
129 /* Check the non-wild match. */
130 if (protocol == answer->protocol) {
131 if (protocol != IPPROTO_IP)
132 break;
133 } else {
134 /* Check for the two wild cases. */
135 if (IPPROTO_IP == protocol) {
136 protocol = answer->protocol;
137 break;
138 }
139 if (IPPROTO_IP == answer->protocol)
140 break;
141 }
142 err = -EPROTONOSUPPORT;
143 }
144
145 if (err) {
146 if (try_loading_module < 2) {
147 rcu_read_unlock();
148 /*
149 * Be more specific, e.g. net-pf-10-proto-132-type-1
150 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
151 */
152 if (++try_loading_module == 1)
153 request_module("net-pf-%d-proto-%d-type-%d",
154 PF_INET6, protocol, sock->type);
155 /*
156 * Fall back to generic, e.g. net-pf-10-proto-132
157 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
158 */
159 else
160 request_module("net-pf-%d-proto-%d",
161 PF_INET6, protocol);
162 goto lookup_protocol;
163 } else
164 goto out_rcu_unlock;
165 }
166
167 err = -EPERM;
168 if (sock->type == SOCK_RAW && !kern &&
169 !ns_capable(net->user_ns, CAP_NET_RAW))
170 goto out_rcu_unlock;
171
172 sock->ops = answer->ops;
173 answer_prot = answer->prot;
174 answer_flags = answer->flags;
175 rcu_read_unlock();
176
177 WARN_ON(!answer_prot->slab);
178
179 err = -ENOBUFS;
180 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
181 if (!sk)
182 goto out;
183
184 sock_init_data(sock, sk);
185
186 err = 0;
187 if (INET_PROTOSW_REUSE & answer_flags)
188 sk->sk_reuse = SK_CAN_REUSE;
189
190 inet = inet_sk(sk);
191 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
192
193 if (SOCK_RAW == sock->type) {
194 inet->inet_num = protocol;
195 if (IPPROTO_RAW == protocol)
196 inet->hdrincl = 1;
197 }
198
199 sk->sk_destruct = inet_sock_destruct;
200 sk->sk_family = PF_INET6;
201 sk->sk_protocol = protocol;
202
203 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
204
205 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
206 np->hop_limit = -1;
207 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
208 np->mc_loop = 1;
209 np->mc_all = 1;
210 np->pmtudisc = IPV6_PMTUDISC_WANT;
211 np->repflow = net->ipv6.sysctl.flowlabel_reflect;
212 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
213
214 /* Init the ipv4 part of the socket since we can have sockets
215 * using v6 API for ipv4.
216 */
217 inet->uc_ttl = -1;
218
219 inet->mc_loop = 1;
220 inet->mc_ttl = 1;
221 inet->mc_index = 0;
222 inet->mc_list = NULL;
223 inet->rcv_tos = 0;
224
225 if (net->ipv4.sysctl_ip_no_pmtu_disc)
226 inet->pmtudisc = IP_PMTUDISC_DONT;
227 else
228 inet->pmtudisc = IP_PMTUDISC_WANT;
229 /*
230 * Increment only the relevant sk_prot->socks debug field, this changes
231 * the previous behaviour of incrementing both the equivalent to
232 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
233 *
234 * This allows better debug granularity as we'll know exactly how many
235 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
236 * transport protocol socks. -acme
237 */
238 sk_refcnt_debug_inc(sk);
239
240 if (inet->inet_num) {
241 /* It assumes that any protocol which allows
242 * the user to assign a number at socket
243 * creation time automatically shares.
244 */
245 inet->inet_sport = htons(inet->inet_num);
246 err = sk->sk_prot->hash(sk);
247 if (err) {
248 sk_common_release(sk);
249 goto out;
250 }
251 }
252 if (sk->sk_prot->init) {
253 err = sk->sk_prot->init(sk);
254 if (err) {
255 sk_common_release(sk);
256 goto out;
257 }
258 }
259
260 if (!kern) {
261 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
262 if (err) {
263 sk_common_release(sk);
264 goto out;
265 }
266 }
267 out:
268 return err;
269 out_rcu_unlock:
270 rcu_read_unlock();
271 goto out;
272 }
273
274 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
275 bool force_bind_address_no_port, bool with_lock)
276 {
277 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
278 struct inet_sock *inet = inet_sk(sk);
279 struct ipv6_pinfo *np = inet6_sk(sk);
280 struct net *net = sock_net(sk);
281 __be32 v4addr = 0;
282 unsigned short snum;
283 bool saved_ipv6only;
284 int addr_type = 0;
285 int err = 0;
286
287 if (addr->sin6_family != AF_INET6)
288 return -EAFNOSUPPORT;
289
290 addr_type = ipv6_addr_type(&addr->sin6_addr);
291 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
292 return -EINVAL;
293
294 snum = ntohs(addr->sin6_port);
295 if (snum && snum < inet_prot_sock(net) &&
296 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
297 return -EACCES;
298
299 if (with_lock)
300 lock_sock(sk);
301
302 /* Check these errors (active socket, double bind). */
303 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
304 err = -EINVAL;
305 goto out;
306 }
307
308 /* Check if the address belongs to the host. */
309 if (addr_type == IPV6_ADDR_MAPPED) {
310 struct net_device *dev = NULL;
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 rcu_read_lock();
322 if (sk->sk_bound_dev_if) {
323 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
324 if (!dev) {
325 err = -ENODEV;
326 goto out_unlock;
327 }
328 }
329
330 /* Reproduce AF_INET checks to make the bindings consistent */
331 v4addr = addr->sin6_addr.s6_addr32[3];
332 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
333 rcu_read_unlock();
334
335 if (!inet_can_nonlocal_bind(net, inet) &&
336 v4addr != htonl(INADDR_ANY) &&
337 chk_addr_ret != RTN_LOCAL &&
338 chk_addr_ret != RTN_MULTICAST &&
339 chk_addr_ret != RTN_BROADCAST) {
340 err = -EADDRNOTAVAIL;
341 goto out;
342 }
343 } else {
344 if (addr_type != IPV6_ADDR_ANY) {
345 struct net_device *dev = NULL;
346
347 rcu_read_lock();
348 if (__ipv6_addr_needs_scope_id(addr_type)) {
349 if (addr_len >= sizeof(struct sockaddr_in6) &&
350 addr->sin6_scope_id) {
351 /* Override any existing binding, if another one
352 * is supplied by user.
353 */
354 sk->sk_bound_dev_if = addr->sin6_scope_id;
355 }
356
357 /* Binding to link-local address requires an interface */
358 if (!sk->sk_bound_dev_if) {
359 err = -EINVAL;
360 goto out_unlock;
361 }
362 }
363
364 if (sk->sk_bound_dev_if) {
365 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
366 if (!dev) {
367 err = -ENODEV;
368 goto out_unlock;
369 }
370 }
371
372 /* ipv4 addr of the socket is invalid. Only the
373 * unspecified and mapped address have a v4 equivalent.
374 */
375 v4addr = LOOPBACK4_IPV6;
376 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
377 if (!ipv6_can_nonlocal_bind(net, inet) &&
378 !ipv6_chk_addr(net, &addr->sin6_addr,
379 dev, 0)) {
380 err = -EADDRNOTAVAIL;
381 goto out_unlock;
382 }
383 }
384 rcu_read_unlock();
385 }
386 }
387
388 inet->inet_rcv_saddr = v4addr;
389 inet->inet_saddr = v4addr;
390
391 sk->sk_v6_rcv_saddr = addr->sin6_addr;
392
393 if (!(addr_type & IPV6_ADDR_MULTICAST))
394 np->saddr = addr->sin6_addr;
395
396 saved_ipv6only = sk->sk_ipv6only;
397 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
398 sk->sk_ipv6only = 1;
399
400 /* Make sure we are allowed to bind here. */
401 if (snum || !(inet->bind_address_no_port ||
402 force_bind_address_no_port)) {
403 if (sk->sk_prot->get_port(sk, snum)) {
404 sk->sk_ipv6only = saved_ipv6only;
405 inet_reset_saddr(sk);
406 err = -EADDRINUSE;
407 goto out;
408 }
409 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
410 if (err) {
411 sk->sk_ipv6only = saved_ipv6only;
412 inet_reset_saddr(sk);
413 goto out;
414 }
415 }
416
417 if (addr_type != IPV6_ADDR_ANY)
418 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
419 if (snum)
420 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
421 inet->inet_sport = htons(inet->inet_num);
422 inet->inet_dport = 0;
423 inet->inet_daddr = 0;
424 out:
425 if (with_lock)
426 release_sock(sk);
427 return err;
428 out_unlock:
429 rcu_read_unlock();
430 goto out;
431 }
432
433 /* bind for INET6 API */
434 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
435 {
436 struct sock *sk = sock->sk;
437 int err = 0;
438
439 /* If the socket has its own bind function then use it. */
440 if (sk->sk_prot->bind)
441 return sk->sk_prot->bind(sk, uaddr, addr_len);
442
443 if (addr_len < SIN6_LEN_RFC2133)
444 return -EINVAL;
445
446 /* BPF prog is run before any checks are done so that if the prog
447 * changes context in a wrong way it will be caught.
448 */
449 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
450 if (err)
451 return err;
452
453 return __inet6_bind(sk, uaddr, addr_len, false, true);
454 }
455 EXPORT_SYMBOL(inet6_bind);
456
457 int inet6_release(struct socket *sock)
458 {
459 struct sock *sk = sock->sk;
460
461 if (!sk)
462 return -EINVAL;
463
464 /* Free mc lists */
465 ipv6_sock_mc_close(sk);
466
467 /* Free ac lists */
468 ipv6_sock_ac_close(sk);
469
470 return inet_release(sock);
471 }
472 EXPORT_SYMBOL(inet6_release);
473
474 void inet6_destroy_sock(struct sock *sk)
475 {
476 struct ipv6_pinfo *np = inet6_sk(sk);
477 struct sk_buff *skb;
478 struct ipv6_txoptions *opt;
479
480 /* Release rx options */
481
482 skb = xchg(&np->pktoptions, NULL);
483 kfree_skb(skb);
484
485 skb = xchg(&np->rxpmtu, NULL);
486 kfree_skb(skb);
487
488 /* Free flowlabels */
489 fl6_free_socklist(sk);
490
491 /* Free tx options */
492
493 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
494 if (opt) {
495 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
496 txopt_put(opt);
497 }
498 }
499 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
500
501 /*
502 * This does both peername and sockname.
503 */
504
505 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
506 int peer)
507 {
508 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
509 struct sock *sk = sock->sk;
510 struct inet_sock *inet = inet_sk(sk);
511 struct ipv6_pinfo *np = inet6_sk(sk);
512
513 sin->sin6_family = AF_INET6;
514 sin->sin6_flowinfo = 0;
515 sin->sin6_scope_id = 0;
516 if (peer) {
517 if (!inet->inet_dport)
518 return -ENOTCONN;
519 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
520 peer == 1)
521 return -ENOTCONN;
522 sin->sin6_port = inet->inet_dport;
523 sin->sin6_addr = sk->sk_v6_daddr;
524 if (np->sndflow)
525 sin->sin6_flowinfo = np->flow_label;
526 } else {
527 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
528 sin->sin6_addr = np->saddr;
529 else
530 sin->sin6_addr = sk->sk_v6_rcv_saddr;
531
532 sin->sin6_port = inet->inet_sport;
533 }
534 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
535 sk->sk_bound_dev_if);
536 return sizeof(*sin);
537 }
538 EXPORT_SYMBOL(inet6_getname);
539
540 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
541 {
542 struct sock *sk = sock->sk;
543 struct net *net = sock_net(sk);
544
545 switch (cmd) {
546 case SIOCADDRT:
547 case SIOCDELRT:
548
549 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
550
551 case SIOCSIFADDR:
552 return addrconf_add_ifaddr(net, (void __user *) arg);
553 case SIOCDIFADDR:
554 return addrconf_del_ifaddr(net, (void __user *) arg);
555 case SIOCSIFDSTADDR:
556 return addrconf_set_dstaddr(net, (void __user *) arg);
557 default:
558 if (!sk->sk_prot->ioctl)
559 return -ENOIOCTLCMD;
560 return sk->sk_prot->ioctl(sk, cmd, arg);
561 }
562 /*NOTREACHED*/
563 return 0;
564 }
565 EXPORT_SYMBOL(inet6_ioctl);
566
567 const struct proto_ops inet6_stream_ops = {
568 .family = PF_INET6,
569 .owner = THIS_MODULE,
570 .release = inet6_release,
571 .bind = inet6_bind,
572 .connect = inet_stream_connect, /* ok */
573 .socketpair = sock_no_socketpair, /* a do nothing */
574 .accept = inet_accept, /* ok */
575 .getname = inet6_getname,
576 .poll = tcp_poll, /* ok */
577 .ioctl = inet6_ioctl, /* must change */
578 .gettstamp = sock_gettstamp,
579 .listen = inet_listen, /* ok */
580 .shutdown = inet_shutdown, /* ok */
581 .setsockopt = sock_common_setsockopt, /* ok */
582 .getsockopt = sock_common_getsockopt, /* ok */
583 .sendmsg = inet_sendmsg, /* ok */
584 .recvmsg = inet_recvmsg, /* ok */
585 #ifdef CONFIG_MMU
586 .mmap = tcp_mmap,
587 #endif
588 .sendpage = inet_sendpage,
589 .sendmsg_locked = tcp_sendmsg_locked,
590 .sendpage_locked = tcp_sendpage_locked,
591 .splice_read = tcp_splice_read,
592 .read_sock = tcp_read_sock,
593 .peek_len = tcp_peek_len,
594 #ifdef CONFIG_COMPAT
595 .compat_setsockopt = compat_sock_common_setsockopt,
596 .compat_getsockopt = compat_sock_common_getsockopt,
597 #endif
598 .set_rcvlowat = tcp_set_rcvlowat,
599 };
600
601 const struct proto_ops inet6_dgram_ops = {
602 .family = PF_INET6,
603 .owner = THIS_MODULE,
604 .release = inet6_release,
605 .bind = inet6_bind,
606 .connect = inet_dgram_connect, /* ok */
607 .socketpair = sock_no_socketpair, /* a do nothing */
608 .accept = sock_no_accept, /* a do nothing */
609 .getname = inet6_getname,
610 .poll = udp_poll, /* ok */
611 .ioctl = inet6_ioctl, /* must change */
612 .gettstamp = sock_gettstamp,
613 .listen = sock_no_listen, /* ok */
614 .shutdown = inet_shutdown, /* ok */
615 .setsockopt = sock_common_setsockopt, /* ok */
616 .getsockopt = sock_common_getsockopt, /* ok */
617 .sendmsg = inet_sendmsg, /* ok */
618 .recvmsg = inet_recvmsg, /* ok */
619 .mmap = sock_no_mmap,
620 .sendpage = sock_no_sendpage,
621 .set_peek_off = sk_set_peek_off,
622 #ifdef CONFIG_COMPAT
623 .compat_setsockopt = compat_sock_common_setsockopt,
624 .compat_getsockopt = compat_sock_common_getsockopt,
625 #endif
626 };
627
628 static const struct net_proto_family inet6_family_ops = {
629 .family = PF_INET6,
630 .create = inet6_create,
631 .owner = THIS_MODULE,
632 };
633
634 int inet6_register_protosw(struct inet_protosw *p)
635 {
636 struct list_head *lh;
637 struct inet_protosw *answer;
638 struct list_head *last_perm;
639 int protocol = p->protocol;
640 int ret;
641
642 spin_lock_bh(&inetsw6_lock);
643
644 ret = -EINVAL;
645 if (p->type >= SOCK_MAX)
646 goto out_illegal;
647
648 /* If we are trying to override a permanent protocol, bail. */
649 answer = NULL;
650 ret = -EPERM;
651 last_perm = &inetsw6[p->type];
652 list_for_each(lh, &inetsw6[p->type]) {
653 answer = list_entry(lh, struct inet_protosw, list);
654
655 /* Check only the non-wild match. */
656 if (INET_PROTOSW_PERMANENT & answer->flags) {
657 if (protocol == answer->protocol)
658 break;
659 last_perm = lh;
660 }
661
662 answer = NULL;
663 }
664 if (answer)
665 goto out_permanent;
666
667 /* Add the new entry after the last permanent entry if any, so that
668 * the new entry does not override a permanent entry when matched with
669 * a wild-card protocol. But it is allowed to override any existing
670 * non-permanent entry. This means that when we remove this entry, the
671 * system automatically returns to the old behavior.
672 */
673 list_add_rcu(&p->list, last_perm);
674 ret = 0;
675 out:
676 spin_unlock_bh(&inetsw6_lock);
677 return ret;
678
679 out_permanent:
680 pr_err("Attempt to override permanent protocol %d\n", protocol);
681 goto out;
682
683 out_illegal:
684 pr_err("Ignoring attempt to register invalid socket type %d\n",
685 p->type);
686 goto out;
687 }
688 EXPORT_SYMBOL(inet6_register_protosw);
689
690 void
691 inet6_unregister_protosw(struct inet_protosw *p)
692 {
693 if (INET_PROTOSW_PERMANENT & p->flags) {
694 pr_err("Attempt to unregister permanent protocol %d\n",
695 p->protocol);
696 } else {
697 spin_lock_bh(&inetsw6_lock);
698 list_del_rcu(&p->list);
699 spin_unlock_bh(&inetsw6_lock);
700
701 synchronize_net();
702 }
703 }
704 EXPORT_SYMBOL(inet6_unregister_protosw);
705
706 int inet6_sk_rebuild_header(struct sock *sk)
707 {
708 struct ipv6_pinfo *np = inet6_sk(sk);
709 struct dst_entry *dst;
710
711 dst = __sk_dst_check(sk, np->dst_cookie);
712
713 if (!dst) {
714 struct inet_sock *inet = inet_sk(sk);
715 struct in6_addr *final_p, final;
716 struct flowi6 fl6;
717
718 memset(&fl6, 0, sizeof(fl6));
719 fl6.flowi6_proto = sk->sk_protocol;
720 fl6.daddr = sk->sk_v6_daddr;
721 fl6.saddr = np->saddr;
722 fl6.flowlabel = np->flow_label;
723 fl6.flowi6_oif = sk->sk_bound_dev_if;
724 fl6.flowi6_mark = sk->sk_mark;
725 fl6.fl6_dport = inet->inet_dport;
726 fl6.fl6_sport = inet->inet_sport;
727 fl6.flowi6_uid = sk->sk_uid;
728 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
729
730 rcu_read_lock();
731 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
732 &final);
733 rcu_read_unlock();
734
735 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
736 if (IS_ERR(dst)) {
737 sk->sk_route_caps = 0;
738 sk->sk_err_soft = -PTR_ERR(dst);
739 return PTR_ERR(dst);
740 }
741
742 ip6_dst_store(sk, dst, NULL, NULL);
743 }
744
745 return 0;
746 }
747 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
748
749 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
750 const struct inet6_skb_parm *opt)
751 {
752 const struct ipv6_pinfo *np = inet6_sk(sk);
753
754 if (np->rxopt.all) {
755 if (((opt->flags & IP6SKB_HOPBYHOP) &&
756 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
757 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
758 np->rxopt.bits.rxflow) ||
759 (opt->srcrt && (np->rxopt.bits.srcrt ||
760 np->rxopt.bits.osrcrt)) ||
761 ((opt->dst1 || opt->dst0) &&
762 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
763 return true;
764 }
765 return false;
766 }
767 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
768
769 static struct packet_type ipv6_packet_type __read_mostly = {
770 .type = cpu_to_be16(ETH_P_IPV6),
771 .func = ipv6_rcv,
772 .list_func = ipv6_list_rcv,
773 };
774
775 static int __init ipv6_packet_init(void)
776 {
777 dev_add_pack(&ipv6_packet_type);
778 return 0;
779 }
780
781 static void ipv6_packet_cleanup(void)
782 {
783 dev_remove_pack(&ipv6_packet_type);
784 }
785
786 static int __net_init ipv6_init_mibs(struct net *net)
787 {
788 int i;
789
790 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
791 if (!net->mib.udp_stats_in6)
792 return -ENOMEM;
793 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
794 if (!net->mib.udplite_stats_in6)
795 goto err_udplite_mib;
796 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
797 if (!net->mib.ipv6_statistics)
798 goto err_ip_mib;
799
800 for_each_possible_cpu(i) {
801 struct ipstats_mib *af_inet6_stats;
802 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
803 u64_stats_init(&af_inet6_stats->syncp);
804 }
805
806
807 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
808 if (!net->mib.icmpv6_statistics)
809 goto err_icmp_mib;
810 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
811 GFP_KERNEL);
812 if (!net->mib.icmpv6msg_statistics)
813 goto err_icmpmsg_mib;
814 return 0;
815
816 err_icmpmsg_mib:
817 free_percpu(net->mib.icmpv6_statistics);
818 err_icmp_mib:
819 free_percpu(net->mib.ipv6_statistics);
820 err_ip_mib:
821 free_percpu(net->mib.udplite_stats_in6);
822 err_udplite_mib:
823 free_percpu(net->mib.udp_stats_in6);
824 return -ENOMEM;
825 }
826
827 static void ipv6_cleanup_mibs(struct net *net)
828 {
829 free_percpu(net->mib.udp_stats_in6);
830 free_percpu(net->mib.udplite_stats_in6);
831 free_percpu(net->mib.ipv6_statistics);
832 free_percpu(net->mib.icmpv6_statistics);
833 kfree(net->mib.icmpv6msg_statistics);
834 }
835
836 static int __net_init inet6_net_init(struct net *net)
837 {
838 int err = 0;
839
840 net->ipv6.sysctl.bindv6only = 0;
841 net->ipv6.sysctl.icmpv6_time = 1*HZ;
842 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
843 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
844 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
845
846 /* By default, rate limit error messages.
847 * Except for pmtu discovery, it would break it.
848 * proc_do_large_bitmap needs pointer to the bitmap.
849 */
850 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
851 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
852 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
853
854 net->ipv6.sysctl.flowlabel_consistency = 1;
855 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
856 net->ipv6.sysctl.idgen_retries = 3;
857 net->ipv6.sysctl.idgen_delay = 1 * HZ;
858 net->ipv6.sysctl.flowlabel_state_ranges = 0;
859 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
860 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
861 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
862 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
863 atomic_set(&net->ipv6.fib6_sernum, 1);
864
865 err = ipv6_init_mibs(net);
866 if (err)
867 return err;
868 #ifdef CONFIG_PROC_FS
869 err = udp6_proc_init(net);
870 if (err)
871 goto out;
872 err = tcp6_proc_init(net);
873 if (err)
874 goto proc_tcp6_fail;
875 err = ac6_proc_init(net);
876 if (err)
877 goto proc_ac6_fail;
878 #endif
879 return err;
880
881 #ifdef CONFIG_PROC_FS
882 proc_ac6_fail:
883 tcp6_proc_exit(net);
884 proc_tcp6_fail:
885 udp6_proc_exit(net);
886 out:
887 ipv6_cleanup_mibs(net);
888 return err;
889 #endif
890 }
891
892 static void __net_exit inet6_net_exit(struct net *net)
893 {
894 #ifdef CONFIG_PROC_FS
895 udp6_proc_exit(net);
896 tcp6_proc_exit(net);
897 ac6_proc_exit(net);
898 #endif
899 ipv6_cleanup_mibs(net);
900 }
901
902 static struct pernet_operations inet6_net_ops = {
903 .init = inet6_net_init,
904 .exit = inet6_net_exit,
905 };
906
907 static int ipv6_route_input(struct sk_buff *skb)
908 {
909 ip6_route_input(skb);
910 return skb_dst(skb)->error;
911 }
912
913 static const struct ipv6_stub ipv6_stub_impl = {
914 .ipv6_sock_mc_join = ipv6_sock_mc_join,
915 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
916 .ipv6_dst_lookup = ip6_dst_lookup,
917 .ipv6_route_input = ipv6_route_input,
918 .fib6_get_table = fib6_get_table,
919 .fib6_table_lookup = fib6_table_lookup,
920 .fib6_lookup = fib6_lookup,
921 .fib6_select_path = fib6_select_path,
922 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
923 .fib6_nh_init = fib6_nh_init,
924 .fib6_nh_release = fib6_nh_release,
925 .udpv6_encap_enable = udpv6_encap_enable,
926 .ndisc_send_na = ndisc_send_na,
927 .nd_tbl = &nd_tbl,
928 };
929
930 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
931 .inet6_bind = __inet6_bind,
932 .udp6_lib_lookup = __udp6_lib_lookup,
933 };
934
935 static int __init inet6_init(void)
936 {
937 struct list_head *r;
938 int err = 0;
939
940 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
941
942 /* Register the socket-side information for inet6_create. */
943 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
944 INIT_LIST_HEAD(r);
945
946 if (disable_ipv6_mod) {
947 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
948 goto out;
949 }
950
951 err = proto_register(&tcpv6_prot, 1);
952 if (err)
953 goto out;
954
955 err = proto_register(&udpv6_prot, 1);
956 if (err)
957 goto out_unregister_tcp_proto;
958
959 err = proto_register(&udplitev6_prot, 1);
960 if (err)
961 goto out_unregister_udp_proto;
962
963 err = proto_register(&rawv6_prot, 1);
964 if (err)
965 goto out_unregister_udplite_proto;
966
967 err = proto_register(&pingv6_prot, 1);
968 if (err)
969 goto out_unregister_raw_proto;
970
971 /* We MUST register RAW sockets before we create the ICMP6,
972 * IGMP6, or NDISC control sockets.
973 */
974 err = rawv6_init();
975 if (err)
976 goto out_unregister_ping_proto;
977
978 /* Register the family here so that the init calls below will
979 * be able to create sockets. (?? is this dangerous ??)
980 */
981 err = sock_register(&inet6_family_ops);
982 if (err)
983 goto out_sock_register_fail;
984
985 /*
986 * ipngwg API draft makes clear that the correct semantics
987 * for TCP and UDP is to consider one TCP and UDP instance
988 * in a host available by both INET and INET6 APIs and
989 * able to communicate via both network protocols.
990 */
991
992 err = register_pernet_subsys(&inet6_net_ops);
993 if (err)
994 goto register_pernet_fail;
995 err = ip6_mr_init();
996 if (err)
997 goto ipmr_fail;
998 err = icmpv6_init();
999 if (err)
1000 goto icmp_fail;
1001 err = ndisc_init();
1002 if (err)
1003 goto ndisc_fail;
1004 err = igmp6_init();
1005 if (err)
1006 goto igmp_fail;
1007
1008 err = ipv6_netfilter_init();
1009 if (err)
1010 goto netfilter_fail;
1011 /* Create /proc/foo6 entries. */
1012 #ifdef CONFIG_PROC_FS
1013 err = -ENOMEM;
1014 if (raw6_proc_init())
1015 goto proc_raw6_fail;
1016 if (udplite6_proc_init())
1017 goto proc_udplite6_fail;
1018 if (ipv6_misc_proc_init())
1019 goto proc_misc6_fail;
1020 if (if6_proc_init())
1021 goto proc_if6_fail;
1022 #endif
1023 err = ip6_route_init();
1024 if (err)
1025 goto ip6_route_fail;
1026 err = ndisc_late_init();
1027 if (err)
1028 goto ndisc_late_fail;
1029 err = ip6_flowlabel_init();
1030 if (err)
1031 goto ip6_flowlabel_fail;
1032 err = ipv6_anycast_init();
1033 if (err)
1034 goto ipv6_anycast_fail;
1035 err = addrconf_init();
1036 if (err)
1037 goto addrconf_fail;
1038
1039 /* Init v6 extension headers. */
1040 err = ipv6_exthdrs_init();
1041 if (err)
1042 goto ipv6_exthdrs_fail;
1043
1044 err = ipv6_frag_init();
1045 if (err)
1046 goto ipv6_frag_fail;
1047
1048 /* Init v6 transport protocols. */
1049 err = udpv6_init();
1050 if (err)
1051 goto udpv6_fail;
1052
1053 err = udplitev6_init();
1054 if (err)
1055 goto udplitev6_fail;
1056
1057 err = udpv6_offload_init();
1058 if (err)
1059 goto udpv6_offload_fail;
1060
1061 err = tcpv6_init();
1062 if (err)
1063 goto tcpv6_fail;
1064
1065 err = ipv6_packet_init();
1066 if (err)
1067 goto ipv6_packet_fail;
1068
1069 err = pingv6_init();
1070 if (err)
1071 goto pingv6_fail;
1072
1073 err = calipso_init();
1074 if (err)
1075 goto calipso_fail;
1076
1077 err = seg6_init();
1078 if (err)
1079 goto seg6_fail;
1080
1081 err = igmp6_late_init();
1082 if (err)
1083 goto igmp6_late_err;
1084
1085 #ifdef CONFIG_SYSCTL
1086 err = ipv6_sysctl_register();
1087 if (err)
1088 goto sysctl_fail;
1089 #endif
1090
1091 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1092 wmb();
1093 ipv6_stub = &ipv6_stub_impl;
1094 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1095 out:
1096 return err;
1097
1098 #ifdef CONFIG_SYSCTL
1099 sysctl_fail:
1100 igmp6_late_cleanup();
1101 #endif
1102 igmp6_late_err:
1103 seg6_exit();
1104 seg6_fail:
1105 calipso_exit();
1106 calipso_fail:
1107 pingv6_exit();
1108 pingv6_fail:
1109 ipv6_packet_cleanup();
1110 ipv6_packet_fail:
1111 tcpv6_exit();
1112 tcpv6_fail:
1113 udpv6_offload_exit();
1114 udpv6_offload_fail:
1115 udplitev6_exit();
1116 udplitev6_fail:
1117 udpv6_exit();
1118 udpv6_fail:
1119 ipv6_frag_exit();
1120 ipv6_frag_fail:
1121 ipv6_exthdrs_exit();
1122 ipv6_exthdrs_fail:
1123 addrconf_cleanup();
1124 addrconf_fail:
1125 ipv6_anycast_cleanup();
1126 ipv6_anycast_fail:
1127 ip6_flowlabel_cleanup();
1128 ip6_flowlabel_fail:
1129 ndisc_late_cleanup();
1130 ndisc_late_fail:
1131 ip6_route_cleanup();
1132 ip6_route_fail:
1133 #ifdef CONFIG_PROC_FS
1134 if6_proc_exit();
1135 proc_if6_fail:
1136 ipv6_misc_proc_exit();
1137 proc_misc6_fail:
1138 udplite6_proc_exit();
1139 proc_udplite6_fail:
1140 raw6_proc_exit();
1141 proc_raw6_fail:
1142 #endif
1143 ipv6_netfilter_fini();
1144 netfilter_fail:
1145 igmp6_cleanup();
1146 igmp_fail:
1147 ndisc_cleanup();
1148 ndisc_fail:
1149 icmpv6_cleanup();
1150 icmp_fail:
1151 ip6_mr_cleanup();
1152 ipmr_fail:
1153 unregister_pernet_subsys(&inet6_net_ops);
1154 register_pernet_fail:
1155 sock_unregister(PF_INET6);
1156 rtnl_unregister_all(PF_INET6);
1157 out_sock_register_fail:
1158 rawv6_exit();
1159 out_unregister_ping_proto:
1160 proto_unregister(&pingv6_prot);
1161 out_unregister_raw_proto:
1162 proto_unregister(&rawv6_prot);
1163 out_unregister_udplite_proto:
1164 proto_unregister(&udplitev6_prot);
1165 out_unregister_udp_proto:
1166 proto_unregister(&udpv6_prot);
1167 out_unregister_tcp_proto:
1168 proto_unregister(&tcpv6_prot);
1169 goto out;
1170 }
1171 module_init(inet6_init);
1172
1173 MODULE_ALIAS_NETPROTO(PF_INET6);
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