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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
67MODULE_AUTHOR("Cast of dozens");
68MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
69MODULE_LICENSE("GPL");
70
71/* The inetsw6 table contains everything that inet6_create needs to
72 * build a new socket.
73 */
74static struct list_head inetsw6[SOCK_MAX];
75static DEFINE_SPINLOCK(inetsw6_lock);
76
77struct ipv6_params ipv6_defaults = {
78 .disable_ipv6 = 0,
79 .autoconf = 1,
80};
81
82static int disable_ipv6_mod;
83
84module_param_named(disable, disable_ipv6_mod, int, 0444);
85MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
86
87module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
88MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
89
90module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
91MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
92
93static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
94{
95 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
96
97 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
98}
99
100static int inet6_create(struct net *net, struct socket *sock, int protocol,
101 int kern)
102{
103 struct inet_sock *inet;
104 struct ipv6_pinfo *np;
105 struct sock *sk;
106 struct inet_protosw *answer;
107 struct proto *answer_prot;
108 unsigned char answer_flags;
109 int try_loading_module = 0;
110 int err;
111
112 if (protocol < 0 || protocol >= IPPROTO_MAX)
113 return -EINVAL;
114
115 /* Look for the requested type/protocol pair. */
116lookup_protocol:
117 err = -ESOCKTNOSUPPORT;
118 rcu_read_lock();
119 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
120
121 err = 0;
122 /* Check the non-wild match. */
123 if (protocol == answer->protocol) {
124 if (protocol != IPPROTO_IP)
125 break;
126 } else {
127 /* Check for the two wild cases. */
128 if (IPPROTO_IP == protocol) {
129 protocol = answer->protocol;
130 break;
131 }
132 if (IPPROTO_IP == answer->protocol)
133 break;
134 }
135 err = -EPROTONOSUPPORT;
136 }
137
138 if (err) {
139 if (try_loading_module < 2) {
140 rcu_read_unlock();
141 /*
142 * Be more specific, e.g. net-pf-10-proto-132-type-1
143 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
144 */
145 if (++try_loading_module == 1)
146 request_module("net-pf-%d-proto-%d-type-%d",
147 PF_INET6, protocol, sock->type);
148 /*
149 * Fall back to generic, e.g. net-pf-10-proto-132
150 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
151 */
152 else
153 request_module("net-pf-%d-proto-%d",
154 PF_INET6, protocol);
155 goto lookup_protocol;
156 } else
157 goto out_rcu_unlock;
158 }
159
160 err = -EPERM;
161 if (sock->type == SOCK_RAW && !kern &&
162 !ns_capable(net->user_ns, CAP_NET_RAW))
163 goto out_rcu_unlock;
164
165 sock->ops = answer->ops;
166 answer_prot = answer->prot;
167 answer_flags = answer->flags;
168 rcu_read_unlock();
169
170 WARN_ON(!answer_prot->slab);
171
172 err = -ENOBUFS;
173 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
174 if (!sk)
175 goto out;
176
177 sock_init_data(sock, sk);
178
179 err = 0;
180 if (INET_PROTOSW_REUSE & answer_flags)
181 sk->sk_reuse = SK_CAN_REUSE;
182
183 inet = inet_sk(sk);
184 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
185
186 if (SOCK_RAW == sock->type) {
187 inet->inet_num = protocol;
188 if (IPPROTO_RAW == protocol)
189 inet->hdrincl = 1;
190 }
191
192 sk->sk_destruct = inet_sock_destruct;
193 sk->sk_family = PF_INET6;
194 sk->sk_protocol = protocol;
195
196 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
197
198 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
199 np->hop_limit = -1;
200 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
201 np->mc_loop = 1;
202 np->pmtudisc = IPV6_PMTUDISC_WANT;
203 np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk));
204 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
205
206 /* Init the ipv4 part of the socket since we can have sockets
207 * using v6 API for ipv4.
208 */
209 inet->uc_ttl = -1;
210
211 inet->mc_loop = 1;
212 inet->mc_ttl = 1;
213 inet->mc_index = 0;
214 inet->mc_list = NULL;
215 inet->rcv_tos = 0;
216
217 if (net->ipv4.sysctl_ip_no_pmtu_disc)
218 inet->pmtudisc = IP_PMTUDISC_DONT;
219 else
220 inet->pmtudisc = IP_PMTUDISC_WANT;
221 /*
222 * Increment only the relevant sk_prot->socks debug field, this changes
223 * the previous behaviour of incrementing both the equivalent to
224 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
225 *
226 * This allows better debug granularity as we'll know exactly how many
227 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
228 * transport protocol socks. -acme
229 */
230 sk_refcnt_debug_inc(sk);
231
232 if (inet->inet_num) {
233 /* It assumes that any protocol which allows
234 * the user to assign a number at socket
235 * creation time automatically shares.
236 */
237 inet->inet_sport = htons(inet->inet_num);
238 err = sk->sk_prot->hash(sk);
239 if (err) {
240 sk_common_release(sk);
241 goto out;
242 }
243 }
244 if (sk->sk_prot->init) {
245 err = sk->sk_prot->init(sk);
246 if (err) {
247 sk_common_release(sk);
248 goto out;
249 }
250 }
251out:
252 return err;
253out_rcu_unlock:
254 rcu_read_unlock();
255 goto out;
256}
257
258
259/* bind for INET6 API */
260int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
261{
262 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
263 struct sock *sk = sock->sk;
264 struct inet_sock *inet = inet_sk(sk);
265 struct ipv6_pinfo *np = inet6_sk(sk);
266 struct net *net = sock_net(sk);
267 __be32 v4addr = 0;
268 unsigned short snum;
269 int addr_type = 0;
270 int err = 0;
271
272 /* If the socket has its own bind function then use it. */
273 if (sk->sk_prot->bind)
274 return sk->sk_prot->bind(sk, uaddr, addr_len);
275
276 if (addr_len < SIN6_LEN_RFC2133)
277 return -EINVAL;
278
279 if (addr->sin6_family != AF_INET6)
280 return -EAFNOSUPPORT;
281
282 addr_type = ipv6_addr_type(&addr->sin6_addr);
283 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
284 return -EINVAL;
285
286 snum = ntohs(addr->sin6_port);
287 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
288 return -EACCES;
289
290 lock_sock(sk);
291
292 /* Check these errors (active socket, double bind). */
293 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
294 err = -EINVAL;
295 goto out;
296 }
297
298 /* Check if the address belongs to the host. */
299 if (addr_type == IPV6_ADDR_MAPPED) {
300 int chk_addr_ret;
301
302 /* Binding to v4-mapped address on a v6-only socket
303 * makes no sense
304 */
305 if (sk->sk_ipv6only) {
306 err = -EINVAL;
307 goto out;
308 }
309
310 /* Reproduce AF_INET checks to make the bindings consistent */
311 v4addr = addr->sin6_addr.s6_addr32[3];
312 chk_addr_ret = inet_addr_type(net, v4addr);
313 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
314 !(inet->freebind || inet->transparent) &&
315 v4addr != htonl(INADDR_ANY) &&
316 chk_addr_ret != RTN_LOCAL &&
317 chk_addr_ret != RTN_MULTICAST &&
318 chk_addr_ret != RTN_BROADCAST) {
319 err = -EADDRNOTAVAIL;
320 goto out;
321 }
322 } else {
323 if (addr_type != IPV6_ADDR_ANY) {
324 struct net_device *dev = NULL;
325
326 rcu_read_lock();
327 if (__ipv6_addr_needs_scope_id(addr_type)) {
328 if (addr_len >= sizeof(struct sockaddr_in6) &&
329 addr->sin6_scope_id) {
330 /* Override any existing binding, if another one
331 * is supplied by user.
332 */
333 sk->sk_bound_dev_if = addr->sin6_scope_id;
334 }
335
336 /* Binding to link-local address requires an interface */
337 if (!sk->sk_bound_dev_if) {
338 err = -EINVAL;
339 goto out_unlock;
340 }
341 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
342 if (!dev) {
343 err = -ENODEV;
344 goto out_unlock;
345 }
346 }
347
348 /* ipv4 addr of the socket is invalid. Only the
349 * unspecified and mapped address have a v4 equivalent.
350 */
351 v4addr = LOOPBACK4_IPV6;
352 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
353 if (!net->ipv6.sysctl.ip_nonlocal_bind &&
354 !(inet->freebind || inet->transparent) &&
355 !ipv6_chk_addr(net, &addr->sin6_addr,
356 dev, 0)) {
357 err = -EADDRNOTAVAIL;
358 goto out_unlock;
359 }
360 }
361 rcu_read_unlock();
362 }
363 }
364
365 inet->inet_rcv_saddr = v4addr;
366 inet->inet_saddr = v4addr;
367
368 sk->sk_v6_rcv_saddr = addr->sin6_addr;
369
370 if (!(addr_type & IPV6_ADDR_MULTICAST))
371 np->saddr = addr->sin6_addr;
372
373 /* Make sure we are allowed to bind here. */
374 if ((snum || !inet->bind_address_no_port) &&
375 sk->sk_prot->get_port(sk, snum)) {
376 inet_reset_saddr(sk);
377 err = -EADDRINUSE;
378 goto out;
379 }
380
381 if (addr_type != IPV6_ADDR_ANY) {
382 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
383 if (addr_type != IPV6_ADDR_MAPPED)
384 sk->sk_ipv6only = 1;
385 }
386 if (snum)
387 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
388 inet->inet_sport = htons(inet->inet_num);
389 inet->inet_dport = 0;
390 inet->inet_daddr = 0;
391out:
392 release_sock(sk);
393 return err;
394out_unlock:
395 rcu_read_unlock();
396 goto out;
397}
398EXPORT_SYMBOL(inet6_bind);
399
400int inet6_release(struct socket *sock)
401{
402 struct sock *sk = sock->sk;
403
404 if (!sk)
405 return -EINVAL;
406
407 /* Free mc lists */
408 ipv6_sock_mc_close(sk);
409
410 /* Free ac lists */
411 ipv6_sock_ac_close(sk);
412
413 return inet_release(sock);
414}
415EXPORT_SYMBOL(inet6_release);
416
417void inet6_destroy_sock(struct sock *sk)
418{
419 struct ipv6_pinfo *np = inet6_sk(sk);
420 struct sk_buff *skb;
421 struct ipv6_txoptions *opt;
422
423 /* Release rx options */
424
425 skb = xchg(&np->pktoptions, NULL);
426 if (skb)
427 kfree_skb(skb);
428
429 skb = xchg(&np->rxpmtu, NULL);
430 if (skb)
431 kfree_skb(skb);
432
433 /* Free flowlabels */
434 fl6_free_socklist(sk);
435
436 /* Free tx options */
437
438 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
439 if (opt) {
440 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
441 txopt_put(opt);
442 }
443}
444EXPORT_SYMBOL_GPL(inet6_destroy_sock);
445
446/*
447 * This does both peername and sockname.
448 */
449
450int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
451 int *uaddr_len, int peer)
452{
453 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
454 struct sock *sk = sock->sk;
455 struct inet_sock *inet = inet_sk(sk);
456 struct ipv6_pinfo *np = inet6_sk(sk);
457
458 sin->sin6_family = AF_INET6;
459 sin->sin6_flowinfo = 0;
460 sin->sin6_scope_id = 0;
461 if (peer) {
462 if (!inet->inet_dport)
463 return -ENOTCONN;
464 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
465 peer == 1)
466 return -ENOTCONN;
467 sin->sin6_port = inet->inet_dport;
468 sin->sin6_addr = sk->sk_v6_daddr;
469 if (np->sndflow)
470 sin->sin6_flowinfo = np->flow_label;
471 } else {
472 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
473 sin->sin6_addr = np->saddr;
474 else
475 sin->sin6_addr = sk->sk_v6_rcv_saddr;
476
477 sin->sin6_port = inet->inet_sport;
478 }
479 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
480 sk->sk_bound_dev_if);
481 *uaddr_len = sizeof(*sin);
482 return 0;
483}
484EXPORT_SYMBOL(inet6_getname);
485
486int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
487{
488 struct sock *sk = sock->sk;
489 struct net *net = sock_net(sk);
490
491 switch (cmd) {
492 case SIOCGSTAMP:
493 return sock_get_timestamp(sk, (struct timeval __user *)arg);
494
495 case SIOCGSTAMPNS:
496 return sock_get_timestampns(sk, (struct timespec __user *)arg);
497
498 case SIOCADDRT:
499 case SIOCDELRT:
500
501 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
502
503 case SIOCSIFADDR:
504 return addrconf_add_ifaddr(net, (void __user *) arg);
505 case SIOCDIFADDR:
506 return addrconf_del_ifaddr(net, (void __user *) arg);
507 case SIOCSIFDSTADDR:
508 return addrconf_set_dstaddr(net, (void __user *) arg);
509 default:
510 if (!sk->sk_prot->ioctl)
511 return -ENOIOCTLCMD;
512 return sk->sk_prot->ioctl(sk, cmd, arg);
513 }
514 /*NOTREACHED*/
515 return 0;
516}
517EXPORT_SYMBOL(inet6_ioctl);
518
519const struct proto_ops inet6_stream_ops = {
520 .family = PF_INET6,
521 .owner = THIS_MODULE,
522 .release = inet6_release,
523 .bind = inet6_bind,
524 .connect = inet_stream_connect, /* ok */
525 .socketpair = sock_no_socketpair, /* a do nothing */
526 .accept = inet_accept, /* ok */
527 .getname = inet6_getname,
528 .poll = tcp_poll, /* ok */
529 .ioctl = inet6_ioctl, /* must change */
530 .listen = inet_listen, /* ok */
531 .shutdown = inet_shutdown, /* ok */
532 .setsockopt = sock_common_setsockopt, /* ok */
533 .getsockopt = sock_common_getsockopt, /* ok */
534 .sendmsg = inet_sendmsg, /* ok */
535 .recvmsg = inet_recvmsg, /* ok */
536 .mmap = sock_no_mmap,
537 .sendpage = inet_sendpage,
538 .splice_read = tcp_splice_read,
539#ifdef CONFIG_COMPAT
540 .compat_setsockopt = compat_sock_common_setsockopt,
541 .compat_getsockopt = compat_sock_common_getsockopt,
542#endif
543};
544
545const struct proto_ops inet6_dgram_ops = {
546 .family = PF_INET6,
547 .owner = THIS_MODULE,
548 .release = inet6_release,
549 .bind = inet6_bind,
550 .connect = inet_dgram_connect, /* ok */
551 .socketpair = sock_no_socketpair, /* a do nothing */
552 .accept = sock_no_accept, /* a do nothing */
553 .getname = inet6_getname,
554 .poll = udp_poll, /* ok */
555 .ioctl = inet6_ioctl, /* must change */
556 .listen = sock_no_listen, /* ok */
557 .shutdown = inet_shutdown, /* ok */
558 .setsockopt = sock_common_setsockopt, /* ok */
559 .getsockopt = sock_common_getsockopt, /* ok */
560 .sendmsg = inet_sendmsg, /* ok */
561 .recvmsg = inet_recvmsg, /* ok */
562 .mmap = sock_no_mmap,
563 .sendpage = sock_no_sendpage,
564#ifdef CONFIG_COMPAT
565 .compat_setsockopt = compat_sock_common_setsockopt,
566 .compat_getsockopt = compat_sock_common_getsockopt,
567#endif
568};
569
570static const struct net_proto_family inet6_family_ops = {
571 .family = PF_INET6,
572 .create = inet6_create,
573 .owner = THIS_MODULE,
574};
575
576int inet6_register_protosw(struct inet_protosw *p)
577{
578 struct list_head *lh;
579 struct inet_protosw *answer;
580 struct list_head *last_perm;
581 int protocol = p->protocol;
582 int ret;
583
584 spin_lock_bh(&inetsw6_lock);
585
586 ret = -EINVAL;
587 if (p->type >= SOCK_MAX)
588 goto out_illegal;
589
590 /* If we are trying to override a permanent protocol, bail. */
591 answer = NULL;
592 ret = -EPERM;
593 last_perm = &inetsw6[p->type];
594 list_for_each(lh, &inetsw6[p->type]) {
595 answer = list_entry(lh, struct inet_protosw, list);
596
597 /* Check only the non-wild match. */
598 if (INET_PROTOSW_PERMANENT & answer->flags) {
599 if (protocol == answer->protocol)
600 break;
601 last_perm = lh;
602 }
603
604 answer = NULL;
605 }
606 if (answer)
607 goto out_permanent;
608
609 /* Add the new entry after the last permanent entry if any, so that
610 * the new entry does not override a permanent entry when matched with
611 * a wild-card protocol. But it is allowed to override any existing
612 * non-permanent entry. This means that when we remove this entry, the
613 * system automatically returns to the old behavior.
614 */
615 list_add_rcu(&p->list, last_perm);
616 ret = 0;
617out:
618 spin_unlock_bh(&inetsw6_lock);
619 return ret;
620
621out_permanent:
622 pr_err("Attempt to override permanent protocol %d\n", protocol);
623 goto out;
624
625out_illegal:
626 pr_err("Ignoring attempt to register invalid socket type %d\n",
627 p->type);
628 goto out;
629}
630EXPORT_SYMBOL(inet6_register_protosw);
631
632void
633inet6_unregister_protosw(struct inet_protosw *p)
634{
635 if (INET_PROTOSW_PERMANENT & p->flags) {
636 pr_err("Attempt to unregister permanent protocol %d\n",
637 p->protocol);
638 } else {
639 spin_lock_bh(&inetsw6_lock);
640 list_del_rcu(&p->list);
641 spin_unlock_bh(&inetsw6_lock);
642
643 synchronize_net();
644 }
645}
646EXPORT_SYMBOL(inet6_unregister_protosw);
647
648int inet6_sk_rebuild_header(struct sock *sk)
649{
650 struct ipv6_pinfo *np = inet6_sk(sk);
651 struct dst_entry *dst;
652
653 dst = __sk_dst_check(sk, np->dst_cookie);
654
655 if (!dst) {
656 struct inet_sock *inet = inet_sk(sk);
657 struct in6_addr *final_p, final;
658 struct flowi6 fl6;
659
660 memset(&fl6, 0, sizeof(fl6));
661 fl6.flowi6_proto = sk->sk_protocol;
662 fl6.daddr = sk->sk_v6_daddr;
663 fl6.saddr = np->saddr;
664 fl6.flowlabel = np->flow_label;
665 fl6.flowi6_oif = sk->sk_bound_dev_if;
666 fl6.flowi6_mark = sk->sk_mark;
667 fl6.fl6_dport = inet->inet_dport;
668 fl6.fl6_sport = inet->inet_sport;
669 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
670
671 rcu_read_lock();
672 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
673 &final);
674 rcu_read_unlock();
675
676 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
677 if (IS_ERR(dst)) {
678 sk->sk_route_caps = 0;
679 sk->sk_err_soft = -PTR_ERR(dst);
680 return PTR_ERR(dst);
681 }
682
683 ip6_dst_store(sk, dst, NULL, NULL);
684 }
685
686 return 0;
687}
688EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
689
690bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
691 const struct inet6_skb_parm *opt)
692{
693 const struct ipv6_pinfo *np = inet6_sk(sk);
694
695 if (np->rxopt.all) {
696 if (((opt->flags & IP6SKB_HOPBYHOP) &&
697 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
698 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
699 np->rxopt.bits.rxflow) ||
700 (opt->srcrt && (np->rxopt.bits.srcrt ||
701 np->rxopt.bits.osrcrt)) ||
702 ((opt->dst1 || opt->dst0) &&
703 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
704 return true;
705 }
706 return false;
707}
708EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
709
710static struct packet_type ipv6_packet_type __read_mostly = {
711 .type = cpu_to_be16(ETH_P_IPV6),
712 .func = ipv6_rcv,
713};
714
715static int __init ipv6_packet_init(void)
716{
717 dev_add_pack(&ipv6_packet_type);
718 return 0;
719}
720
721static void ipv6_packet_cleanup(void)
722{
723 dev_remove_pack(&ipv6_packet_type);
724}
725
726static int __net_init ipv6_init_mibs(struct net *net)
727{
728 int i;
729
730 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
731 if (!net->mib.udp_stats_in6)
732 return -ENOMEM;
733 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
734 if (!net->mib.udplite_stats_in6)
735 goto err_udplite_mib;
736 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
737 if (!net->mib.ipv6_statistics)
738 goto err_ip_mib;
739
740 for_each_possible_cpu(i) {
741 struct ipstats_mib *af_inet6_stats;
742 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
743 u64_stats_init(&af_inet6_stats->syncp);
744 }
745
746
747 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
748 if (!net->mib.icmpv6_statistics)
749 goto err_icmp_mib;
750 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
751 GFP_KERNEL);
752 if (!net->mib.icmpv6msg_statistics)
753 goto err_icmpmsg_mib;
754 return 0;
755
756err_icmpmsg_mib:
757 free_percpu(net->mib.icmpv6_statistics);
758err_icmp_mib:
759 free_percpu(net->mib.ipv6_statistics);
760err_ip_mib:
761 free_percpu(net->mib.udplite_stats_in6);
762err_udplite_mib:
763 free_percpu(net->mib.udp_stats_in6);
764 return -ENOMEM;
765}
766
767static void ipv6_cleanup_mibs(struct net *net)
768{
769 free_percpu(net->mib.udp_stats_in6);
770 free_percpu(net->mib.udplite_stats_in6);
771 free_percpu(net->mib.ipv6_statistics);
772 free_percpu(net->mib.icmpv6_statistics);
773 kfree(net->mib.icmpv6msg_statistics);
774}
775
776static int __net_init inet6_net_init(struct net *net)
777{
778 int err = 0;
779
780 net->ipv6.sysctl.bindv6only = 0;
781 net->ipv6.sysctl.icmpv6_time = 1*HZ;
782 net->ipv6.sysctl.flowlabel_consistency = 1;
783 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
784 net->ipv6.sysctl.idgen_retries = 3;
785 net->ipv6.sysctl.idgen_delay = 1 * HZ;
786 net->ipv6.sysctl.flowlabel_state_ranges = 0;
787 atomic_set(&net->ipv6.fib6_sernum, 1);
788
789 err = ipv6_init_mibs(net);
790 if (err)
791 return err;
792#ifdef CONFIG_PROC_FS
793 err = udp6_proc_init(net);
794 if (err)
795 goto out;
796 err = tcp6_proc_init(net);
797 if (err)
798 goto proc_tcp6_fail;
799 err = ac6_proc_init(net);
800 if (err)
801 goto proc_ac6_fail;
802#endif
803 return err;
804
805#ifdef CONFIG_PROC_FS
806proc_ac6_fail:
807 tcp6_proc_exit(net);
808proc_tcp6_fail:
809 udp6_proc_exit(net);
810out:
811 ipv6_cleanup_mibs(net);
812 return err;
813#endif
814}
815
816static void __net_exit inet6_net_exit(struct net *net)
817{
818#ifdef CONFIG_PROC_FS
819 udp6_proc_exit(net);
820 tcp6_proc_exit(net);
821 ac6_proc_exit(net);
822#endif
823 ipv6_cleanup_mibs(net);
824}
825
826static struct pernet_operations inet6_net_ops = {
827 .init = inet6_net_init,
828 .exit = inet6_net_exit,
829};
830
831static const struct ipv6_stub ipv6_stub_impl = {
832 .ipv6_sock_mc_join = ipv6_sock_mc_join,
833 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
834 .ipv6_dst_lookup = ip6_dst_lookup,
835 .udpv6_encap_enable = udpv6_encap_enable,
836 .ndisc_send_na = ndisc_send_na,
837 .nd_tbl = &nd_tbl,
838};
839
840static int __init inet6_init(void)
841{
842 struct list_head *r;
843 int err = 0;
844
845 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
846
847 /* Register the socket-side information for inet6_create. */
848 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
849 INIT_LIST_HEAD(r);
850
851 if (disable_ipv6_mod) {
852 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
853 goto out;
854 }
855
856 err = proto_register(&tcpv6_prot, 1);
857 if (err)
858 goto out;
859
860 err = proto_register(&udpv6_prot, 1);
861 if (err)
862 goto out_unregister_tcp_proto;
863
864 err = proto_register(&udplitev6_prot, 1);
865 if (err)
866 goto out_unregister_udp_proto;
867
868 err = proto_register(&rawv6_prot, 1);
869 if (err)
870 goto out_unregister_udplite_proto;
871
872 err = proto_register(&pingv6_prot, 1);
873 if (err)
874 goto out_unregister_ping_proto;
875
876 /* We MUST register RAW sockets before we create the ICMP6,
877 * IGMP6, or NDISC control sockets.
878 */
879 err = rawv6_init();
880 if (err)
881 goto out_unregister_raw_proto;
882
883 /* Register the family here so that the init calls below will
884 * be able to create sockets. (?? is this dangerous ??)
885 */
886 err = sock_register(&inet6_family_ops);
887 if (err)
888 goto out_sock_register_fail;
889
890 /*
891 * ipngwg API draft makes clear that the correct semantics
892 * for TCP and UDP is to consider one TCP and UDP instance
893 * in a host available by both INET and INET6 APIs and
894 * able to communicate via both network protocols.
895 */
896
897 err = register_pernet_subsys(&inet6_net_ops);
898 if (err)
899 goto register_pernet_fail;
900 err = icmpv6_init();
901 if (err)
902 goto icmp_fail;
903 err = ip6_mr_init();
904 if (err)
905 goto ipmr_fail;
906 err = ndisc_init();
907 if (err)
908 goto ndisc_fail;
909 err = igmp6_init();
910 if (err)
911 goto igmp_fail;
912
913 ipv6_stub = &ipv6_stub_impl;
914
915 err = ipv6_netfilter_init();
916 if (err)
917 goto netfilter_fail;
918 /* Create /proc/foo6 entries. */
919#ifdef CONFIG_PROC_FS
920 err = -ENOMEM;
921 if (raw6_proc_init())
922 goto proc_raw6_fail;
923 if (udplite6_proc_init())
924 goto proc_udplite6_fail;
925 if (ipv6_misc_proc_init())
926 goto proc_misc6_fail;
927 if (if6_proc_init())
928 goto proc_if6_fail;
929#endif
930 err = ip6_route_init();
931 if (err)
932 goto ip6_route_fail;
933 err = ndisc_late_init();
934 if (err)
935 goto ndisc_late_fail;
936 err = ip6_flowlabel_init();
937 if (err)
938 goto ip6_flowlabel_fail;
939 err = addrconf_init();
940 if (err)
941 goto addrconf_fail;
942
943 /* Init v6 extension headers. */
944 err = ipv6_exthdrs_init();
945 if (err)
946 goto ipv6_exthdrs_fail;
947
948 err = ipv6_frag_init();
949 if (err)
950 goto ipv6_frag_fail;
951
952 /* Init v6 transport protocols. */
953 err = udpv6_init();
954 if (err)
955 goto udpv6_fail;
956
957 err = udplitev6_init();
958 if (err)
959 goto udplitev6_fail;
960
961 err = tcpv6_init();
962 if (err)
963 goto tcpv6_fail;
964
965 err = ipv6_packet_init();
966 if (err)
967 goto ipv6_packet_fail;
968
969 err = pingv6_init();
970 if (err)
971 goto pingv6_fail;
972
973#ifdef CONFIG_SYSCTL
974 err = ipv6_sysctl_register();
975 if (err)
976 goto sysctl_fail;
977#endif
978out:
979 return err;
980
981#ifdef CONFIG_SYSCTL
982sysctl_fail:
983 pingv6_exit();
984#endif
985pingv6_fail:
986 ipv6_packet_cleanup();
987ipv6_packet_fail:
988 tcpv6_exit();
989tcpv6_fail:
990 udplitev6_exit();
991udplitev6_fail:
992 udpv6_exit();
993udpv6_fail:
994 ipv6_frag_exit();
995ipv6_frag_fail:
996 ipv6_exthdrs_exit();
997ipv6_exthdrs_fail:
998 addrconf_cleanup();
999addrconf_fail:
1000 ip6_flowlabel_cleanup();
1001ip6_flowlabel_fail:
1002 ndisc_late_cleanup();
1003ndisc_late_fail:
1004 ip6_route_cleanup();
1005ip6_route_fail:
1006#ifdef CONFIG_PROC_FS
1007 if6_proc_exit();
1008proc_if6_fail:
1009 ipv6_misc_proc_exit();
1010proc_misc6_fail:
1011 udplite6_proc_exit();
1012proc_udplite6_fail:
1013 raw6_proc_exit();
1014proc_raw6_fail:
1015#endif
1016 ipv6_netfilter_fini();
1017netfilter_fail:
1018 igmp6_cleanup();
1019igmp_fail:
1020 ndisc_cleanup();
1021ndisc_fail:
1022 ip6_mr_cleanup();
1023ipmr_fail:
1024 icmpv6_cleanup();
1025icmp_fail:
1026 unregister_pernet_subsys(&inet6_net_ops);
1027register_pernet_fail:
1028 sock_unregister(PF_INET6);
1029 rtnl_unregister_all(PF_INET6);
1030out_sock_register_fail:
1031 rawv6_exit();
1032out_unregister_ping_proto:
1033 proto_unregister(&pingv6_prot);
1034out_unregister_raw_proto:
1035 proto_unregister(&rawv6_prot);
1036out_unregister_udplite_proto:
1037 proto_unregister(&udplitev6_prot);
1038out_unregister_udp_proto:
1039 proto_unregister(&udpv6_prot);
1040out_unregister_tcp_proto:
1041 proto_unregister(&tcpv6_prot);
1042 goto out;
1043}
1044module_init(inet6_init);
1045
1046MODULE_ALIAS_NETPROTO(PF_INET6);
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#include <net/rpl.h>
63#include <net/compat.h>
64#include <net/xfrm.h>
65#include <net/ioam6.h>
66#include <net/rawv6.h>
67
68#include <linux/uaccess.h>
69#include <linux/mroute6.h>
70
71#include "ip6_offload.h"
72
73MODULE_AUTHOR("Cast of dozens");
74MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
75MODULE_LICENSE("GPL");
76
77/* The inetsw6 table contains everything that inet6_create needs to
78 * build a new socket.
79 */
80static struct list_head inetsw6[SOCK_MAX];
81static DEFINE_SPINLOCK(inetsw6_lock);
82
83struct ipv6_params ipv6_defaults = {
84 .disable_ipv6 = 0,
85 .autoconf = 1,
86};
87
88static int disable_ipv6_mod;
89
90module_param_named(disable, disable_ipv6_mod, int, 0444);
91MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
92
93module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
94MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
95
96module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
97MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
98
99bool ipv6_mod_enabled(void)
100{
101 return disable_ipv6_mod == 0;
102}
103EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
104
105static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
106{
107 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
108
109 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
110}
111
112void inet6_sock_destruct(struct sock *sk)
113{
114 inet6_cleanup_sock(sk);
115 inet_sock_destruct(sk);
116}
117EXPORT_SYMBOL_GPL(inet6_sock_destruct);
118
119static int inet6_create(struct net *net, struct socket *sock, int protocol,
120 int kern)
121{
122 struct inet_sock *inet;
123 struct ipv6_pinfo *np;
124 struct sock *sk;
125 struct inet_protosw *answer;
126 struct proto *answer_prot;
127 unsigned char answer_flags;
128 int try_loading_module = 0;
129 int err;
130
131 if (protocol < 0 || protocol >= IPPROTO_MAX)
132 return -EINVAL;
133
134 /* Look for the requested type/protocol pair. */
135lookup_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 &&
181 !ns_capable(net->user_ns, CAP_NET_RAW))
182 goto out_rcu_unlock;
183
184 sock->ops = answer->ops;
185 answer_prot = answer->prot;
186 answer_flags = answer->flags;
187 rcu_read_unlock();
188
189 WARN_ON(!answer_prot->slab);
190
191 err = -ENOBUFS;
192 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
193 if (!sk)
194 goto out;
195
196 sock_init_data(sock, sk);
197
198 err = 0;
199 if (INET_PROTOSW_REUSE & answer_flags)
200 sk->sk_reuse = SK_CAN_REUSE;
201
202 inet = inet_sk(sk);
203 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
204
205 if (SOCK_RAW == sock->type) {
206 inet->inet_num = protocol;
207 if (IPPROTO_RAW == protocol)
208 inet->hdrincl = 1;
209 }
210
211 sk->sk_destruct = inet6_sock_destruct;
212 sk->sk_family = PF_INET6;
213 sk->sk_protocol = protocol;
214
215 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
216
217 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
218 np->hop_limit = -1;
219 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
220 np->mc_loop = 1;
221 np->mc_all = 1;
222 np->pmtudisc = IPV6_PMTUDISC_WANT;
223 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
224 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
225 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
226
227 /* Init the ipv4 part of the socket since we can have sockets
228 * using v6 API for ipv4.
229 */
230 inet->uc_ttl = -1;
231
232 inet->mc_loop = 1;
233 inet->mc_ttl = 1;
234 inet->mc_index = 0;
235 RCU_INIT_POINTER(inet->mc_list, NULL);
236 inet->rcv_tos = 0;
237
238 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
239 inet->pmtudisc = IP_PMTUDISC_DONT;
240 else
241 inet->pmtudisc = IP_PMTUDISC_WANT;
242 /*
243 * Increment only the relevant sk_prot->socks debug field, this changes
244 * the previous behaviour of incrementing both the equivalent to
245 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
246 *
247 * This allows better debug granularity as we'll know exactly how many
248 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
249 * transport protocol socks. -acme
250 */
251 sk_refcnt_debug_inc(sk);
252
253 if (inet->inet_num) {
254 /* It assumes that any protocol which allows
255 * the user to assign a number at socket
256 * creation time automatically shares.
257 */
258 inet->inet_sport = htons(inet->inet_num);
259 err = sk->sk_prot->hash(sk);
260 if (err) {
261 sk_common_release(sk);
262 goto out;
263 }
264 }
265 if (sk->sk_prot->init) {
266 err = sk->sk_prot->init(sk);
267 if (err) {
268 sk_common_release(sk);
269 goto out;
270 }
271 }
272
273 if (!kern) {
274 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
275 if (err) {
276 sk_common_release(sk);
277 goto out;
278 }
279 }
280out:
281 return err;
282out_rcu_unlock:
283 rcu_read_unlock();
284 goto out;
285}
286
287static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
288 u32 flags)
289{
290 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
291 struct inet_sock *inet = inet_sk(sk);
292 struct ipv6_pinfo *np = inet6_sk(sk);
293 struct net *net = sock_net(sk);
294 __be32 v4addr = 0;
295 unsigned short snum;
296 bool saved_ipv6only;
297 int addr_type = 0;
298 int err = 0;
299
300 if (addr->sin6_family != AF_INET6)
301 return -EAFNOSUPPORT;
302
303 addr_type = ipv6_addr_type(&addr->sin6_addr);
304 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
305 return -EINVAL;
306
307 snum = ntohs(addr->sin6_port);
308 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
309 snum && inet_port_requires_bind_service(net, snum) &&
310 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
311 return -EACCES;
312
313 if (flags & BIND_WITH_LOCK)
314 lock_sock(sk);
315
316 /* Check these errors (active socket, double bind). */
317 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
318 err = -EINVAL;
319 goto out;
320 }
321
322 /* Check if the address belongs to the host. */
323 if (addr_type == IPV6_ADDR_MAPPED) {
324 struct net_device *dev = NULL;
325 int chk_addr_ret;
326
327 /* Binding to v4-mapped address on a v6-only socket
328 * makes no sense
329 */
330 if (ipv6_only_sock(sk)) {
331 err = -EINVAL;
332 goto out;
333 }
334
335 rcu_read_lock();
336 if (sk->sk_bound_dev_if) {
337 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
338 if (!dev) {
339 err = -ENODEV;
340 goto out_unlock;
341 }
342 }
343
344 /* Reproduce AF_INET checks to make the bindings consistent */
345 v4addr = addr->sin6_addr.s6_addr32[3];
346 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
347 rcu_read_unlock();
348
349 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
350 chk_addr_ret)) {
351 err = -EADDRNOTAVAIL;
352 goto out;
353 }
354 } else {
355 if (addr_type != IPV6_ADDR_ANY) {
356 struct net_device *dev = NULL;
357
358 rcu_read_lock();
359 if (__ipv6_addr_needs_scope_id(addr_type)) {
360 if (addr_len >= sizeof(struct sockaddr_in6) &&
361 addr->sin6_scope_id) {
362 /* Override any existing binding, if another one
363 * is supplied by user.
364 */
365 sk->sk_bound_dev_if = addr->sin6_scope_id;
366 }
367
368 /* Binding to link-local address requires an interface */
369 if (!sk->sk_bound_dev_if) {
370 err = -EINVAL;
371 goto out_unlock;
372 }
373 }
374
375 if (sk->sk_bound_dev_if) {
376 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
377 if (!dev) {
378 err = -ENODEV;
379 goto out_unlock;
380 }
381 }
382
383 /* ipv4 addr of the socket is invalid. Only the
384 * unspecified and mapped address have a v4 equivalent.
385 */
386 v4addr = LOOPBACK4_IPV6;
387 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
388 if (!ipv6_can_nonlocal_bind(net, inet) &&
389 !ipv6_chk_addr(net, &addr->sin6_addr,
390 dev, 0)) {
391 err = -EADDRNOTAVAIL;
392 goto out_unlock;
393 }
394 }
395 rcu_read_unlock();
396 }
397 }
398
399 inet->inet_rcv_saddr = v4addr;
400 inet->inet_saddr = v4addr;
401
402 sk->sk_v6_rcv_saddr = addr->sin6_addr;
403
404 if (!(addr_type & IPV6_ADDR_MULTICAST))
405 np->saddr = addr->sin6_addr;
406
407 saved_ipv6only = sk->sk_ipv6only;
408 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
409 sk->sk_ipv6only = 1;
410
411 /* Make sure we are allowed to bind here. */
412 if (snum || !(inet->bind_address_no_port ||
413 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
414 err = sk->sk_prot->get_port(sk, snum);
415 if (err) {
416 sk->sk_ipv6only = saved_ipv6only;
417 inet_reset_saddr(sk);
418 goto out;
419 }
420 if (!(flags & BIND_FROM_BPF)) {
421 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
422 if (err) {
423 sk->sk_ipv6only = saved_ipv6only;
424 inet_reset_saddr(sk);
425 if (sk->sk_prot->put_port)
426 sk->sk_prot->put_port(sk);
427 goto out;
428 }
429 }
430 }
431
432 if (addr_type != IPV6_ADDR_ANY)
433 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
434 if (snum)
435 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
436 inet->inet_sport = htons(inet->inet_num);
437 inet->inet_dport = 0;
438 inet->inet_daddr = 0;
439out:
440 if (flags & BIND_WITH_LOCK)
441 release_sock(sk);
442 return err;
443out_unlock:
444 rcu_read_unlock();
445 goto out;
446}
447
448/* bind for INET6 API */
449int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
450{
451 struct sock *sk = sock->sk;
452 u32 flags = BIND_WITH_LOCK;
453 const struct proto *prot;
454 int err = 0;
455
456 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
457 prot = READ_ONCE(sk->sk_prot);
458 /* If the socket has its own bind function then use it. */
459 if (prot->bind)
460 return prot->bind(sk, uaddr, addr_len);
461
462 if (addr_len < SIN6_LEN_RFC2133)
463 return -EINVAL;
464
465 /* BPF prog is run before any checks are done so that if the prog
466 * changes context in a wrong way it will be caught.
467 */
468 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
469 CGROUP_INET6_BIND, &flags);
470 if (err)
471 return err;
472
473 return __inet6_bind(sk, uaddr, addr_len, flags);
474}
475EXPORT_SYMBOL(inet6_bind);
476
477int inet6_release(struct socket *sock)
478{
479 struct sock *sk = sock->sk;
480
481 if (!sk)
482 return -EINVAL;
483
484 /* Free mc lists */
485 ipv6_sock_mc_close(sk);
486
487 /* Free ac lists */
488 ipv6_sock_ac_close(sk);
489
490 return inet_release(sock);
491}
492EXPORT_SYMBOL(inet6_release);
493
494void inet6_cleanup_sock(struct sock *sk)
495{
496 struct ipv6_pinfo *np = inet6_sk(sk);
497 struct sk_buff *skb;
498 struct ipv6_txoptions *opt;
499
500 /* Release rx options */
501
502 skb = xchg(&np->pktoptions, NULL);
503 kfree_skb(skb);
504
505 skb = xchg(&np->rxpmtu, NULL);
506 kfree_skb(skb);
507
508 /* Free flowlabels */
509 fl6_free_socklist(sk);
510
511 /* Free tx options */
512
513 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
514 if (opt) {
515 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
516 txopt_put(opt);
517 }
518}
519EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
520
521/*
522 * This does both peername and sockname.
523 */
524int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
525 int peer)
526{
527 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
528 struct sock *sk = sock->sk;
529 struct inet_sock *inet = inet_sk(sk);
530 struct ipv6_pinfo *np = inet6_sk(sk);
531
532 sin->sin6_family = AF_INET6;
533 sin->sin6_flowinfo = 0;
534 sin->sin6_scope_id = 0;
535 lock_sock(sk);
536 if (peer) {
537 if (!inet->inet_dport ||
538 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
539 peer == 1)) {
540 release_sock(sk);
541 return -ENOTCONN;
542 }
543 sin->sin6_port = inet->inet_dport;
544 sin->sin6_addr = sk->sk_v6_daddr;
545 if (np->sndflow)
546 sin->sin6_flowinfo = np->flow_label;
547 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
548 CGROUP_INET6_GETPEERNAME);
549 } else {
550 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
551 sin->sin6_addr = np->saddr;
552 else
553 sin->sin6_addr = sk->sk_v6_rcv_saddr;
554 sin->sin6_port = inet->inet_sport;
555 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
556 CGROUP_INET6_GETSOCKNAME);
557 }
558 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
559 sk->sk_bound_dev_if);
560 release_sock(sk);
561 return sizeof(*sin);
562}
563EXPORT_SYMBOL(inet6_getname);
564
565int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
566{
567 void __user *argp = (void __user *)arg;
568 struct sock *sk = sock->sk;
569 struct net *net = sock_net(sk);
570 const struct proto *prot;
571
572 switch (cmd) {
573 case SIOCADDRT:
574 case SIOCDELRT: {
575 struct in6_rtmsg rtmsg;
576
577 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
578 return -EFAULT;
579 return ipv6_route_ioctl(net, cmd, &rtmsg);
580 }
581 case SIOCSIFADDR:
582 return addrconf_add_ifaddr(net, argp);
583 case SIOCDIFADDR:
584 return addrconf_del_ifaddr(net, argp);
585 case SIOCSIFDSTADDR:
586 return addrconf_set_dstaddr(net, argp);
587 default:
588 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
589 prot = READ_ONCE(sk->sk_prot);
590 if (!prot->ioctl)
591 return -ENOIOCTLCMD;
592 return prot->ioctl(sk, cmd, arg);
593 }
594 /*NOTREACHED*/
595 return 0;
596}
597EXPORT_SYMBOL(inet6_ioctl);
598
599#ifdef CONFIG_COMPAT
600struct compat_in6_rtmsg {
601 struct in6_addr rtmsg_dst;
602 struct in6_addr rtmsg_src;
603 struct in6_addr rtmsg_gateway;
604 u32 rtmsg_type;
605 u16 rtmsg_dst_len;
606 u16 rtmsg_src_len;
607 u32 rtmsg_metric;
608 u32 rtmsg_info;
609 u32 rtmsg_flags;
610 s32 rtmsg_ifindex;
611};
612
613static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
614 struct compat_in6_rtmsg __user *ur)
615{
616 struct in6_rtmsg rt;
617
618 if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
619 3 * sizeof(struct in6_addr)) ||
620 get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
621 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
622 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
623 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
624 get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
625 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
626 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
627 return -EFAULT;
628
629
630 return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
631}
632
633int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
634{
635 void __user *argp = compat_ptr(arg);
636 struct sock *sk = sock->sk;
637
638 switch (cmd) {
639 case SIOCADDRT:
640 case SIOCDELRT:
641 return inet6_compat_routing_ioctl(sk, cmd, argp);
642 default:
643 return -ENOIOCTLCMD;
644 }
645}
646EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
647#endif /* CONFIG_COMPAT */
648
649INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
650 size_t));
651int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
652{
653 struct sock *sk = sock->sk;
654 const struct proto *prot;
655
656 if (unlikely(inet_send_prepare(sk)))
657 return -EAGAIN;
658
659 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
660 prot = READ_ONCE(sk->sk_prot);
661 return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
662 sk, msg, size);
663}
664
665INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
666 size_t, int, int *));
667int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
668 int flags)
669{
670 struct sock *sk = sock->sk;
671 const struct proto *prot;
672 int addr_len = 0;
673 int err;
674
675 if (likely(!(flags & MSG_ERRQUEUE)))
676 sock_rps_record_flow(sk);
677
678 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
679 prot = READ_ONCE(sk->sk_prot);
680 err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
681 sk, msg, size, flags, &addr_len);
682 if (err >= 0)
683 msg->msg_namelen = addr_len;
684 return err;
685}
686
687const struct proto_ops inet6_stream_ops = {
688 .family = PF_INET6,
689 .owner = THIS_MODULE,
690 .release = inet6_release,
691 .bind = inet6_bind,
692 .connect = inet_stream_connect, /* ok */
693 .socketpair = sock_no_socketpair, /* a do nothing */
694 .accept = inet_accept, /* ok */
695 .getname = inet6_getname,
696 .poll = tcp_poll, /* ok */
697 .ioctl = inet6_ioctl, /* must change */
698 .gettstamp = sock_gettstamp,
699 .listen = inet_listen, /* ok */
700 .shutdown = inet_shutdown, /* ok */
701 .setsockopt = sock_common_setsockopt, /* ok */
702 .getsockopt = sock_common_getsockopt, /* ok */
703 .sendmsg = inet6_sendmsg, /* retpoline's sake */
704 .recvmsg = inet6_recvmsg, /* retpoline's sake */
705#ifdef CONFIG_MMU
706 .mmap = tcp_mmap,
707#endif
708 .sendpage = inet_sendpage,
709 .sendmsg_locked = tcp_sendmsg_locked,
710 .sendpage_locked = tcp_sendpage_locked,
711 .splice_read = tcp_splice_read,
712 .read_sock = tcp_read_sock,
713 .read_skb = tcp_read_skb,
714 .peek_len = tcp_peek_len,
715#ifdef CONFIG_COMPAT
716 .compat_ioctl = inet6_compat_ioctl,
717#endif
718 .set_rcvlowat = tcp_set_rcvlowat,
719};
720
721const struct proto_ops inet6_dgram_ops = {
722 .family = PF_INET6,
723 .owner = THIS_MODULE,
724 .release = inet6_release,
725 .bind = inet6_bind,
726 .connect = inet_dgram_connect, /* ok */
727 .socketpair = sock_no_socketpair, /* a do nothing */
728 .accept = sock_no_accept, /* a do nothing */
729 .getname = inet6_getname,
730 .poll = udp_poll, /* ok */
731 .ioctl = inet6_ioctl, /* must change */
732 .gettstamp = sock_gettstamp,
733 .listen = sock_no_listen, /* ok */
734 .shutdown = inet_shutdown, /* ok */
735 .setsockopt = sock_common_setsockopt, /* ok */
736 .getsockopt = sock_common_getsockopt, /* ok */
737 .sendmsg = inet6_sendmsg, /* retpoline's sake */
738 .recvmsg = inet6_recvmsg, /* retpoline's sake */
739 .read_skb = udp_read_skb,
740 .mmap = sock_no_mmap,
741 .sendpage = sock_no_sendpage,
742 .set_peek_off = sk_set_peek_off,
743#ifdef CONFIG_COMPAT
744 .compat_ioctl = inet6_compat_ioctl,
745#endif
746};
747
748static const struct net_proto_family inet6_family_ops = {
749 .family = PF_INET6,
750 .create = inet6_create,
751 .owner = THIS_MODULE,
752};
753
754int inet6_register_protosw(struct inet_protosw *p)
755{
756 struct list_head *lh;
757 struct inet_protosw *answer;
758 struct list_head *last_perm;
759 int protocol = p->protocol;
760 int ret;
761
762 spin_lock_bh(&inetsw6_lock);
763
764 ret = -EINVAL;
765 if (p->type >= SOCK_MAX)
766 goto out_illegal;
767
768 /* If we are trying to override a permanent protocol, bail. */
769 answer = NULL;
770 ret = -EPERM;
771 last_perm = &inetsw6[p->type];
772 list_for_each(lh, &inetsw6[p->type]) {
773 answer = list_entry(lh, struct inet_protosw, list);
774
775 /* Check only the non-wild match. */
776 if (INET_PROTOSW_PERMANENT & answer->flags) {
777 if (protocol == answer->protocol)
778 break;
779 last_perm = lh;
780 }
781
782 answer = NULL;
783 }
784 if (answer)
785 goto out_permanent;
786
787 /* Add the new entry after the last permanent entry if any, so that
788 * the new entry does not override a permanent entry when matched with
789 * a wild-card protocol. But it is allowed to override any existing
790 * non-permanent entry. This means that when we remove this entry, the
791 * system automatically returns to the old behavior.
792 */
793 list_add_rcu(&p->list, last_perm);
794 ret = 0;
795out:
796 spin_unlock_bh(&inetsw6_lock);
797 return ret;
798
799out_permanent:
800 pr_err("Attempt to override permanent protocol %d\n", protocol);
801 goto out;
802
803out_illegal:
804 pr_err("Ignoring attempt to register invalid socket type %d\n",
805 p->type);
806 goto out;
807}
808EXPORT_SYMBOL(inet6_register_protosw);
809
810void
811inet6_unregister_protosw(struct inet_protosw *p)
812{
813 if (INET_PROTOSW_PERMANENT & p->flags) {
814 pr_err("Attempt to unregister permanent protocol %d\n",
815 p->protocol);
816 } else {
817 spin_lock_bh(&inetsw6_lock);
818 list_del_rcu(&p->list);
819 spin_unlock_bh(&inetsw6_lock);
820
821 synchronize_net();
822 }
823}
824EXPORT_SYMBOL(inet6_unregister_protosw);
825
826int inet6_sk_rebuild_header(struct sock *sk)
827{
828 struct ipv6_pinfo *np = inet6_sk(sk);
829 struct dst_entry *dst;
830
831 dst = __sk_dst_check(sk, np->dst_cookie);
832
833 if (!dst) {
834 struct inet_sock *inet = inet_sk(sk);
835 struct in6_addr *final_p, final;
836 struct flowi6 fl6;
837
838 memset(&fl6, 0, sizeof(fl6));
839 fl6.flowi6_proto = sk->sk_protocol;
840 fl6.daddr = sk->sk_v6_daddr;
841 fl6.saddr = np->saddr;
842 fl6.flowlabel = np->flow_label;
843 fl6.flowi6_oif = sk->sk_bound_dev_if;
844 fl6.flowi6_mark = sk->sk_mark;
845 fl6.fl6_dport = inet->inet_dport;
846 fl6.fl6_sport = inet->inet_sport;
847 fl6.flowi6_uid = sk->sk_uid;
848 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
849
850 rcu_read_lock();
851 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
852 &final);
853 rcu_read_unlock();
854
855 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
856 if (IS_ERR(dst)) {
857 sk->sk_route_caps = 0;
858 sk->sk_err_soft = -PTR_ERR(dst);
859 return PTR_ERR(dst);
860 }
861
862 ip6_dst_store(sk, dst, NULL, NULL);
863 }
864
865 return 0;
866}
867EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
868
869bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
870 const struct inet6_skb_parm *opt)
871{
872 const struct ipv6_pinfo *np = inet6_sk(sk);
873
874 if (np->rxopt.all) {
875 if (((opt->flags & IP6SKB_HOPBYHOP) &&
876 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
877 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
878 np->rxopt.bits.rxflow) ||
879 (opt->srcrt && (np->rxopt.bits.srcrt ||
880 np->rxopt.bits.osrcrt)) ||
881 ((opt->dst1 || opt->dst0) &&
882 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
883 return true;
884 }
885 return false;
886}
887EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
888
889static struct packet_type ipv6_packet_type __read_mostly = {
890 .type = cpu_to_be16(ETH_P_IPV6),
891 .func = ipv6_rcv,
892 .list_func = ipv6_list_rcv,
893};
894
895static int __init ipv6_packet_init(void)
896{
897 dev_add_pack(&ipv6_packet_type);
898 return 0;
899}
900
901static void ipv6_packet_cleanup(void)
902{
903 dev_remove_pack(&ipv6_packet_type);
904}
905
906static int __net_init ipv6_init_mibs(struct net *net)
907{
908 int i;
909
910 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
911 if (!net->mib.udp_stats_in6)
912 return -ENOMEM;
913 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
914 if (!net->mib.udplite_stats_in6)
915 goto err_udplite_mib;
916 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
917 if (!net->mib.ipv6_statistics)
918 goto err_ip_mib;
919
920 for_each_possible_cpu(i) {
921 struct ipstats_mib *af_inet6_stats;
922 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
923 u64_stats_init(&af_inet6_stats->syncp);
924 }
925
926
927 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
928 if (!net->mib.icmpv6_statistics)
929 goto err_icmp_mib;
930 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
931 GFP_KERNEL);
932 if (!net->mib.icmpv6msg_statistics)
933 goto err_icmpmsg_mib;
934 return 0;
935
936err_icmpmsg_mib:
937 free_percpu(net->mib.icmpv6_statistics);
938err_icmp_mib:
939 free_percpu(net->mib.ipv6_statistics);
940err_ip_mib:
941 free_percpu(net->mib.udplite_stats_in6);
942err_udplite_mib:
943 free_percpu(net->mib.udp_stats_in6);
944 return -ENOMEM;
945}
946
947static void ipv6_cleanup_mibs(struct net *net)
948{
949 free_percpu(net->mib.udp_stats_in6);
950 free_percpu(net->mib.udplite_stats_in6);
951 free_percpu(net->mib.ipv6_statistics);
952 free_percpu(net->mib.icmpv6_statistics);
953 kfree(net->mib.icmpv6msg_statistics);
954}
955
956static int __net_init inet6_net_init(struct net *net)
957{
958 int err = 0;
959
960 net->ipv6.sysctl.bindv6only = 0;
961 net->ipv6.sysctl.icmpv6_time = 1*HZ;
962 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
963 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
964 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
965
966 /* By default, rate limit error messages.
967 * Except for pmtu discovery, it would break it.
968 * proc_do_large_bitmap needs pointer to the bitmap.
969 */
970 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
971 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
972 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
973
974 net->ipv6.sysctl.flowlabel_consistency = 1;
975 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
976 net->ipv6.sysctl.idgen_retries = 3;
977 net->ipv6.sysctl.idgen_delay = 1 * HZ;
978 net->ipv6.sysctl.flowlabel_state_ranges = 0;
979 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
980 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
981 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
982 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
983 net->ipv6.sysctl.fib_notify_on_flag_change = 0;
984 atomic_set(&net->ipv6.fib6_sernum, 1);
985
986 net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
987 net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
988
989 err = ipv6_init_mibs(net);
990 if (err)
991 return err;
992#ifdef CONFIG_PROC_FS
993 err = udp6_proc_init(net);
994 if (err)
995 goto out;
996 err = tcp6_proc_init(net);
997 if (err)
998 goto proc_tcp6_fail;
999 err = ac6_proc_init(net);
1000 if (err)
1001 goto proc_ac6_fail;
1002#endif
1003 return err;
1004
1005#ifdef CONFIG_PROC_FS
1006proc_ac6_fail:
1007 tcp6_proc_exit(net);
1008proc_tcp6_fail:
1009 udp6_proc_exit(net);
1010out:
1011 ipv6_cleanup_mibs(net);
1012 return err;
1013#endif
1014}
1015
1016static void __net_exit inet6_net_exit(struct net *net)
1017{
1018#ifdef CONFIG_PROC_FS
1019 udp6_proc_exit(net);
1020 tcp6_proc_exit(net);
1021 ac6_proc_exit(net);
1022#endif
1023 ipv6_cleanup_mibs(net);
1024}
1025
1026static struct pernet_operations inet6_net_ops = {
1027 .init = inet6_net_init,
1028 .exit = inet6_net_exit,
1029};
1030
1031static int ipv6_route_input(struct sk_buff *skb)
1032{
1033 ip6_route_input(skb);
1034 return skb_dst(skb)->error;
1035}
1036
1037static const struct ipv6_stub ipv6_stub_impl = {
1038 .ipv6_sock_mc_join = ipv6_sock_mc_join,
1039 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1040 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1041 .ipv6_route_input = ipv6_route_input,
1042 .fib6_get_table = fib6_get_table,
1043 .fib6_table_lookup = fib6_table_lookup,
1044 .fib6_lookup = fib6_lookup,
1045 .fib6_select_path = fib6_select_path,
1046 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1047 .fib6_nh_init = fib6_nh_init,
1048 .fib6_nh_release = fib6_nh_release,
1049 .fib6_nh_release_dsts = fib6_nh_release_dsts,
1050 .fib6_update_sernum = fib6_update_sernum_stub,
1051 .fib6_rt_update = fib6_rt_update,
1052 .ip6_del_rt = ip6_del_rt,
1053 .udpv6_encap_enable = udpv6_encap_enable,
1054 .ndisc_send_na = ndisc_send_na,
1055#if IS_ENABLED(CONFIG_XFRM)
1056 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1057 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1058 .xfrm6_rcv_encap = xfrm6_rcv_encap,
1059#endif
1060 .nd_tbl = &nd_tbl,
1061 .ipv6_fragment = ip6_fragment,
1062 .ipv6_dev_find = ipv6_dev_find,
1063};
1064
1065static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1066 .inet6_bind = __inet6_bind,
1067 .udp6_lib_lookup = __udp6_lib_lookup,
1068 .ipv6_setsockopt = do_ipv6_setsockopt,
1069 .ipv6_getsockopt = do_ipv6_getsockopt,
1070};
1071
1072static int __init inet6_init(void)
1073{
1074 struct list_head *r;
1075 int err = 0;
1076
1077 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1078
1079 /* Register the socket-side information for inet6_create. */
1080 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1081 INIT_LIST_HEAD(r);
1082
1083 raw_hashinfo_init(&raw_v6_hashinfo);
1084
1085 if (disable_ipv6_mod) {
1086 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1087 goto out;
1088 }
1089
1090 err = proto_register(&tcpv6_prot, 1);
1091 if (err)
1092 goto out;
1093
1094 err = proto_register(&udpv6_prot, 1);
1095 if (err)
1096 goto out_unregister_tcp_proto;
1097
1098 err = proto_register(&udplitev6_prot, 1);
1099 if (err)
1100 goto out_unregister_udp_proto;
1101
1102 err = proto_register(&rawv6_prot, 1);
1103 if (err)
1104 goto out_unregister_udplite_proto;
1105
1106 err = proto_register(&pingv6_prot, 1);
1107 if (err)
1108 goto out_unregister_raw_proto;
1109
1110 /* We MUST register RAW sockets before we create the ICMP6,
1111 * IGMP6, or NDISC control sockets.
1112 */
1113 err = rawv6_init();
1114 if (err)
1115 goto out_unregister_ping_proto;
1116
1117 /* Register the family here so that the init calls below will
1118 * be able to create sockets. (?? is this dangerous ??)
1119 */
1120 err = sock_register(&inet6_family_ops);
1121 if (err)
1122 goto out_sock_register_fail;
1123
1124 /*
1125 * ipngwg API draft makes clear that the correct semantics
1126 * for TCP and UDP is to consider one TCP and UDP instance
1127 * in a host available by both INET and INET6 APIs and
1128 * able to communicate via both network protocols.
1129 */
1130
1131 err = register_pernet_subsys(&inet6_net_ops);
1132 if (err)
1133 goto register_pernet_fail;
1134 err = ip6_mr_init();
1135 if (err)
1136 goto ipmr_fail;
1137 err = icmpv6_init();
1138 if (err)
1139 goto icmp_fail;
1140 err = ndisc_init();
1141 if (err)
1142 goto ndisc_fail;
1143 err = igmp6_init();
1144 if (err)
1145 goto igmp_fail;
1146
1147 err = ipv6_netfilter_init();
1148 if (err)
1149 goto netfilter_fail;
1150 /* Create /proc/foo6 entries. */
1151#ifdef CONFIG_PROC_FS
1152 err = -ENOMEM;
1153 if (raw6_proc_init())
1154 goto proc_raw6_fail;
1155 if (udplite6_proc_init())
1156 goto proc_udplite6_fail;
1157 if (ipv6_misc_proc_init())
1158 goto proc_misc6_fail;
1159 if (if6_proc_init())
1160 goto proc_if6_fail;
1161#endif
1162 err = ip6_route_init();
1163 if (err)
1164 goto ip6_route_fail;
1165 err = ndisc_late_init();
1166 if (err)
1167 goto ndisc_late_fail;
1168 err = ip6_flowlabel_init();
1169 if (err)
1170 goto ip6_flowlabel_fail;
1171 err = ipv6_anycast_init();
1172 if (err)
1173 goto ipv6_anycast_fail;
1174 err = addrconf_init();
1175 if (err)
1176 goto addrconf_fail;
1177
1178 /* Init v6 extension headers. */
1179 err = ipv6_exthdrs_init();
1180 if (err)
1181 goto ipv6_exthdrs_fail;
1182
1183 err = ipv6_frag_init();
1184 if (err)
1185 goto ipv6_frag_fail;
1186
1187 /* Init v6 transport protocols. */
1188 err = udpv6_init();
1189 if (err)
1190 goto udpv6_fail;
1191
1192 err = udplitev6_init();
1193 if (err)
1194 goto udplitev6_fail;
1195
1196 err = udpv6_offload_init();
1197 if (err)
1198 goto udpv6_offload_fail;
1199
1200 err = tcpv6_init();
1201 if (err)
1202 goto tcpv6_fail;
1203
1204 err = ipv6_packet_init();
1205 if (err)
1206 goto ipv6_packet_fail;
1207
1208 err = pingv6_init();
1209 if (err)
1210 goto pingv6_fail;
1211
1212 err = calipso_init();
1213 if (err)
1214 goto calipso_fail;
1215
1216 err = seg6_init();
1217 if (err)
1218 goto seg6_fail;
1219
1220 err = rpl_init();
1221 if (err)
1222 goto rpl_fail;
1223
1224 err = ioam6_init();
1225 if (err)
1226 goto ioam6_fail;
1227
1228 err = igmp6_late_init();
1229 if (err)
1230 goto igmp6_late_err;
1231
1232#ifdef CONFIG_SYSCTL
1233 err = ipv6_sysctl_register();
1234 if (err)
1235 goto sysctl_fail;
1236#endif
1237
1238 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1239 wmb();
1240 ipv6_stub = &ipv6_stub_impl;
1241 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1242out:
1243 return err;
1244
1245#ifdef CONFIG_SYSCTL
1246sysctl_fail:
1247 igmp6_late_cleanup();
1248#endif
1249igmp6_late_err:
1250 ioam6_exit();
1251ioam6_fail:
1252 rpl_exit();
1253rpl_fail:
1254 seg6_exit();
1255seg6_fail:
1256 calipso_exit();
1257calipso_fail:
1258 pingv6_exit();
1259pingv6_fail:
1260 ipv6_packet_cleanup();
1261ipv6_packet_fail:
1262 tcpv6_exit();
1263tcpv6_fail:
1264 udpv6_offload_exit();
1265udpv6_offload_fail:
1266 udplitev6_exit();
1267udplitev6_fail:
1268 udpv6_exit();
1269udpv6_fail:
1270 ipv6_frag_exit();
1271ipv6_frag_fail:
1272 ipv6_exthdrs_exit();
1273ipv6_exthdrs_fail:
1274 addrconf_cleanup();
1275addrconf_fail:
1276 ipv6_anycast_cleanup();
1277ipv6_anycast_fail:
1278 ip6_flowlabel_cleanup();
1279ip6_flowlabel_fail:
1280 ndisc_late_cleanup();
1281ndisc_late_fail:
1282 ip6_route_cleanup();
1283ip6_route_fail:
1284#ifdef CONFIG_PROC_FS
1285 if6_proc_exit();
1286proc_if6_fail:
1287 ipv6_misc_proc_exit();
1288proc_misc6_fail:
1289 udplite6_proc_exit();
1290proc_udplite6_fail:
1291 raw6_proc_exit();
1292proc_raw6_fail:
1293#endif
1294 ipv6_netfilter_fini();
1295netfilter_fail:
1296 igmp6_cleanup();
1297igmp_fail:
1298 ndisc_cleanup();
1299ndisc_fail:
1300 icmpv6_cleanup();
1301icmp_fail:
1302 ip6_mr_cleanup();
1303ipmr_fail:
1304 unregister_pernet_subsys(&inet6_net_ops);
1305register_pernet_fail:
1306 sock_unregister(PF_INET6);
1307 rtnl_unregister_all(PF_INET6);
1308out_sock_register_fail:
1309 rawv6_exit();
1310out_unregister_ping_proto:
1311 proto_unregister(&pingv6_prot);
1312out_unregister_raw_proto:
1313 proto_unregister(&rawv6_prot);
1314out_unregister_udplite_proto:
1315 proto_unregister(&udplitev6_prot);
1316out_unregister_udp_proto:
1317 proto_unregister(&udpv6_prot);
1318out_unregister_tcp_proto:
1319 proto_unregister(&tcpv6_prot);
1320 goto out;
1321}
1322module_init(inet6_init);
1323
1324MODULE_ALIAS_NETPROTO(PF_INET6);