Loading...
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#include <net/calipso.h>
64#include <net/seg6.h>
65
66#include <linux/uaccess.h>
67#include <linux/mroute6.h>
68
69#include "ip6_offload.h"
70
71MODULE_AUTHOR("Cast of dozens");
72MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
73MODULE_LICENSE("GPL");
74
75/* The inetsw6 table contains everything that inet6_create needs to
76 * build a new socket.
77 */
78static struct list_head inetsw6[SOCK_MAX];
79static DEFINE_SPINLOCK(inetsw6_lock);
80
81struct ipv6_params ipv6_defaults = {
82 .disable_ipv6 = 0,
83 .autoconf = 1,
84};
85
86static int disable_ipv6_mod;
87
88module_param_named(disable, disable_ipv6_mod, int, 0444);
89MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
90
91module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
92MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
93
94module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
95MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
96
97bool ipv6_mod_enabled(void)
98{
99 return disable_ipv6_mod == 0;
100}
101EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
102
103static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
104{
105 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
106
107 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
108}
109
110static int inet6_create(struct net *net, struct socket *sock, int protocol,
111 int kern)
112{
113 struct inet_sock *inet;
114 struct ipv6_pinfo *np;
115 struct sock *sk;
116 struct inet_protosw *answer;
117 struct proto *answer_prot;
118 unsigned char answer_flags;
119 int try_loading_module = 0;
120 int err;
121
122 if (protocol < 0 || protocol >= IPPROTO_MAX)
123 return -EINVAL;
124
125 /* Look for the requested type/protocol pair. */
126lookup_protocol:
127 err = -ESOCKTNOSUPPORT;
128 rcu_read_lock();
129 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
130
131 err = 0;
132 /* Check the non-wild match. */
133 if (protocol == answer->protocol) {
134 if (protocol != IPPROTO_IP)
135 break;
136 } else {
137 /* Check for the two wild cases. */
138 if (IPPROTO_IP == protocol) {
139 protocol = answer->protocol;
140 break;
141 }
142 if (IPPROTO_IP == answer->protocol)
143 break;
144 }
145 err = -EPROTONOSUPPORT;
146 }
147
148 if (err) {
149 if (try_loading_module < 2) {
150 rcu_read_unlock();
151 /*
152 * Be more specific, e.g. net-pf-10-proto-132-type-1
153 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
154 */
155 if (++try_loading_module == 1)
156 request_module("net-pf-%d-proto-%d-type-%d",
157 PF_INET6, protocol, sock->type);
158 /*
159 * Fall back to generic, e.g. net-pf-10-proto-132
160 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
161 */
162 else
163 request_module("net-pf-%d-proto-%d",
164 PF_INET6, protocol);
165 goto lookup_protocol;
166 } else
167 goto out_rcu_unlock;
168 }
169
170 err = -EPERM;
171 if (sock->type == SOCK_RAW && !kern &&
172 !ns_capable(net->user_ns, CAP_NET_RAW))
173 goto out_rcu_unlock;
174
175 sock->ops = answer->ops;
176 answer_prot = answer->prot;
177 answer_flags = answer->flags;
178 rcu_read_unlock();
179
180 WARN_ON(!answer_prot->slab);
181
182 err = -ENOBUFS;
183 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
184 if (!sk)
185 goto out;
186
187 sock_init_data(sock, sk);
188
189 err = 0;
190 if (INET_PROTOSW_REUSE & answer_flags)
191 sk->sk_reuse = SK_CAN_REUSE;
192
193 inet = inet_sk(sk);
194 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
195
196 if (SOCK_RAW == sock->type) {
197 inet->inet_num = protocol;
198 if (IPPROTO_RAW == protocol)
199 inet->hdrincl = 1;
200 }
201
202 sk->sk_destruct = inet_sock_destruct;
203 sk->sk_family = PF_INET6;
204 sk->sk_protocol = protocol;
205
206 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
207
208 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
209 np->hop_limit = -1;
210 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
211 np->mc_loop = 1;
212 np->pmtudisc = IPV6_PMTUDISC_WANT;
213 np->repflow = net->ipv6.sysctl.flowlabel_reflect;
214 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
215
216 /* Init the ipv4 part of the socket since we can have sockets
217 * using v6 API for ipv4.
218 */
219 inet->uc_ttl = -1;
220
221 inet->mc_loop = 1;
222 inet->mc_ttl = 1;
223 inet->mc_index = 0;
224 inet->mc_list = NULL;
225 inet->rcv_tos = 0;
226
227 if (net->ipv4.sysctl_ip_no_pmtu_disc)
228 inet->pmtudisc = IP_PMTUDISC_DONT;
229 else
230 inet->pmtudisc = IP_PMTUDISC_WANT;
231 /*
232 * Increment only the relevant sk_prot->socks debug field, this changes
233 * the previous behaviour of incrementing both the equivalent to
234 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
235 *
236 * This allows better debug granularity as we'll know exactly how many
237 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
238 * transport protocol socks. -acme
239 */
240 sk_refcnt_debug_inc(sk);
241
242 if (inet->inet_num) {
243 /* It assumes that any protocol which allows
244 * the user to assign a number at socket
245 * creation time automatically shares.
246 */
247 inet->inet_sport = htons(inet->inet_num);
248 err = sk->sk_prot->hash(sk);
249 if (err) {
250 sk_common_release(sk);
251 goto out;
252 }
253 }
254 if (sk->sk_prot->init) {
255 err = sk->sk_prot->init(sk);
256 if (err) {
257 sk_common_release(sk);
258 goto out;
259 }
260 }
261
262 if (!kern) {
263 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
264 if (err) {
265 sk_common_release(sk);
266 goto out;
267 }
268 }
269out:
270 return err;
271out_rcu_unlock:
272 rcu_read_unlock();
273 goto out;
274}
275
276
277/* bind for INET6 API */
278int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
279{
280 struct sock *sk = sock->sk;
281 int err = 0;
282
283 /* If the socket has its own bind function then use it. */
284 if (sk->sk_prot->bind)
285 return sk->sk_prot->bind(sk, uaddr, addr_len);
286
287 if (addr_len < SIN6_LEN_RFC2133)
288 return -EINVAL;
289
290 /* BPF prog is run before any checks are done so that if the prog
291 * changes context in a wrong way it will be caught.
292 */
293 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
294 if (err)
295 return err;
296
297 return __inet6_bind(sk, uaddr, addr_len, false, true);
298}
299EXPORT_SYMBOL(inet6_bind);
300
301int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
302 bool force_bind_address_no_port, bool with_lock)
303{
304 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
305 struct inet_sock *inet = inet_sk(sk);
306 struct ipv6_pinfo *np = inet6_sk(sk);
307 struct net *net = sock_net(sk);
308 __be32 v4addr = 0;
309 unsigned short snum;
310 bool saved_ipv6only;
311 int addr_type = 0;
312 int err = 0;
313
314 if (addr->sin6_family != AF_INET6)
315 return -EAFNOSUPPORT;
316
317 addr_type = ipv6_addr_type(&addr->sin6_addr);
318 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
319 return -EINVAL;
320
321 snum = ntohs(addr->sin6_port);
322 if (snum && snum < inet_prot_sock(net) &&
323 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
324 return -EACCES;
325
326 if (with_lock)
327 lock_sock(sk);
328
329 /* Check these errors (active socket, double bind). */
330 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
331 err = -EINVAL;
332 goto out;
333 }
334
335 /* Check if the address belongs to the host. */
336 if (addr_type == IPV6_ADDR_MAPPED) {
337 int chk_addr_ret;
338
339 /* Binding to v4-mapped address on a v6-only socket
340 * makes no sense
341 */
342 if (sk->sk_ipv6only) {
343 err = -EINVAL;
344 goto out;
345 }
346
347 /* Reproduce AF_INET checks to make the bindings consistent */
348 v4addr = addr->sin6_addr.s6_addr32[3];
349 chk_addr_ret = inet_addr_type(net, v4addr);
350 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
351 !(inet->freebind || inet->transparent) &&
352 v4addr != htonl(INADDR_ANY) &&
353 chk_addr_ret != RTN_LOCAL &&
354 chk_addr_ret != RTN_MULTICAST &&
355 chk_addr_ret != RTN_BROADCAST) {
356 err = -EADDRNOTAVAIL;
357 goto out;
358 }
359 } else {
360 if (addr_type != IPV6_ADDR_ANY) {
361 struct net_device *dev = NULL;
362
363 rcu_read_lock();
364 if (__ipv6_addr_needs_scope_id(addr_type)) {
365 if (addr_len >= sizeof(struct sockaddr_in6) &&
366 addr->sin6_scope_id) {
367 /* Override any existing binding, if another one
368 * is supplied by user.
369 */
370 sk->sk_bound_dev_if = addr->sin6_scope_id;
371 }
372
373 /* Binding to link-local address requires an interface */
374 if (!sk->sk_bound_dev_if) {
375 err = -EINVAL;
376 goto out_unlock;
377 }
378 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
379 if (!dev) {
380 err = -ENODEV;
381 goto out_unlock;
382 }
383 }
384
385 /* ipv4 addr of the socket is invalid. Only the
386 * unspecified and mapped address have a v4 equivalent.
387 */
388 v4addr = LOOPBACK4_IPV6;
389 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
390 if (!net->ipv6.sysctl.ip_nonlocal_bind &&
391 !(inet->freebind || inet->transparent) &&
392 !ipv6_chk_addr(net, &addr->sin6_addr,
393 dev, 0)) {
394 err = -EADDRNOTAVAIL;
395 goto out_unlock;
396 }
397 }
398 rcu_read_unlock();
399 }
400 }
401
402 inet->inet_rcv_saddr = v4addr;
403 inet->inet_saddr = v4addr;
404
405 sk->sk_v6_rcv_saddr = addr->sin6_addr;
406
407 if (!(addr_type & IPV6_ADDR_MULTICAST))
408 np->saddr = addr->sin6_addr;
409
410 saved_ipv6only = sk->sk_ipv6only;
411 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
412 sk->sk_ipv6only = 1;
413
414 /* Make sure we are allowed to bind here. */
415 if (snum || !(inet->bind_address_no_port ||
416 force_bind_address_no_port)) {
417 if (sk->sk_prot->get_port(sk, snum)) {
418 sk->sk_ipv6only = saved_ipv6only;
419 inet_reset_saddr(sk);
420 err = -EADDRINUSE;
421 goto out;
422 }
423 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
424 if (err) {
425 sk->sk_ipv6only = saved_ipv6only;
426 inet_reset_saddr(sk);
427 goto out;
428 }
429 }
430
431 if (addr_type != IPV6_ADDR_ANY)
432 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
433 if (snum)
434 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
435 inet->inet_sport = htons(inet->inet_num);
436 inet->inet_dport = 0;
437 inet->inet_daddr = 0;
438out:
439 if (with_lock)
440 release_sock(sk);
441 return err;
442out_unlock:
443 rcu_read_unlock();
444 goto out;
445}
446
447int inet6_release(struct socket *sock)
448{
449 struct sock *sk = sock->sk;
450
451 if (!sk)
452 return -EINVAL;
453
454 /* Free mc lists */
455 ipv6_sock_mc_close(sk);
456
457 /* Free ac lists */
458 ipv6_sock_ac_close(sk);
459
460 return inet_release(sock);
461}
462EXPORT_SYMBOL(inet6_release);
463
464void inet6_destroy_sock(struct sock *sk)
465{
466 struct ipv6_pinfo *np = inet6_sk(sk);
467 struct sk_buff *skb;
468 struct ipv6_txoptions *opt;
469
470 /* Release rx options */
471
472 skb = xchg(&np->pktoptions, NULL);
473 if (skb)
474 kfree_skb(skb);
475
476 skb = xchg(&np->rxpmtu, NULL);
477 if (skb)
478 kfree_skb(skb);
479
480 /* Free flowlabels */
481 fl6_free_socklist(sk);
482
483 /* Free tx options */
484
485 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
486 if (opt) {
487 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
488 txopt_put(opt);
489 }
490}
491EXPORT_SYMBOL_GPL(inet6_destroy_sock);
492
493/*
494 * This does both peername and sockname.
495 */
496
497int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
498 int peer)
499{
500 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
501 struct sock *sk = sock->sk;
502 struct inet_sock *inet = inet_sk(sk);
503 struct ipv6_pinfo *np = inet6_sk(sk);
504
505 sin->sin6_family = AF_INET6;
506 sin->sin6_flowinfo = 0;
507 sin->sin6_scope_id = 0;
508 if (peer) {
509 if (!inet->inet_dport)
510 return -ENOTCONN;
511 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
512 peer == 1)
513 return -ENOTCONN;
514 sin->sin6_port = inet->inet_dport;
515 sin->sin6_addr = sk->sk_v6_daddr;
516 if (np->sndflow)
517 sin->sin6_flowinfo = np->flow_label;
518 } else {
519 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
520 sin->sin6_addr = np->saddr;
521 else
522 sin->sin6_addr = sk->sk_v6_rcv_saddr;
523
524 sin->sin6_port = inet->inet_sport;
525 }
526 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
527 sk->sk_bound_dev_if);
528 return sizeof(*sin);
529}
530EXPORT_SYMBOL(inet6_getname);
531
532int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
533{
534 struct sock *sk = sock->sk;
535 struct net *net = sock_net(sk);
536
537 switch (cmd) {
538 case SIOCGSTAMP:
539 return sock_get_timestamp(sk, (struct timeval __user *)arg);
540
541 case SIOCGSTAMPNS:
542 return sock_get_timestampns(sk, (struct timespec __user *)arg);
543
544 case SIOCADDRT:
545 case SIOCDELRT:
546
547 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
548
549 case SIOCSIFADDR:
550 return addrconf_add_ifaddr(net, (void __user *) arg);
551 case SIOCDIFADDR:
552 return addrconf_del_ifaddr(net, (void __user *) arg);
553 case SIOCSIFDSTADDR:
554 return addrconf_set_dstaddr(net, (void __user *) arg);
555 default:
556 if (!sk->sk_prot->ioctl)
557 return -ENOIOCTLCMD;
558 return sk->sk_prot->ioctl(sk, cmd, arg);
559 }
560 /*NOTREACHED*/
561 return 0;
562}
563EXPORT_SYMBOL(inet6_ioctl);
564
565const struct proto_ops inet6_stream_ops = {
566 .family = PF_INET6,
567 .owner = THIS_MODULE,
568 .release = inet6_release,
569 .bind = inet6_bind,
570 .connect = inet_stream_connect, /* ok */
571 .socketpair = sock_no_socketpair, /* a do nothing */
572 .accept = inet_accept, /* ok */
573 .getname = inet6_getname,
574 .poll = tcp_poll, /* ok */
575 .ioctl = inet6_ioctl, /* must change */
576 .listen = inet_listen, /* ok */
577 .shutdown = inet_shutdown, /* ok */
578 .setsockopt = sock_common_setsockopt, /* ok */
579 .getsockopt = sock_common_getsockopt, /* ok */
580 .sendmsg = inet_sendmsg, /* ok */
581 .recvmsg = inet_recvmsg, /* ok */
582 .mmap = sock_no_mmap,
583 .sendpage = inet_sendpage,
584 .sendmsg_locked = tcp_sendmsg_locked,
585 .sendpage_locked = tcp_sendpage_locked,
586 .splice_read = tcp_splice_read,
587 .read_sock = tcp_read_sock,
588 .peek_len = tcp_peek_len,
589#ifdef CONFIG_COMPAT
590 .compat_setsockopt = compat_sock_common_setsockopt,
591 .compat_getsockopt = compat_sock_common_getsockopt,
592#endif
593};
594
595const struct proto_ops inet6_dgram_ops = {
596 .family = PF_INET6,
597 .owner = THIS_MODULE,
598 .release = inet6_release,
599 .bind = inet6_bind,
600 .connect = inet_dgram_connect, /* ok */
601 .socketpair = sock_no_socketpair, /* a do nothing */
602 .accept = sock_no_accept, /* a do nothing */
603 .getname = inet6_getname,
604 .poll = udp_poll, /* ok */
605 .ioctl = inet6_ioctl, /* must change */
606 .listen = sock_no_listen, /* ok */
607 .shutdown = inet_shutdown, /* ok */
608 .setsockopt = sock_common_setsockopt, /* ok */
609 .getsockopt = sock_common_getsockopt, /* ok */
610 .sendmsg = inet_sendmsg, /* ok */
611 .recvmsg = inet_recvmsg, /* ok */
612 .mmap = sock_no_mmap,
613 .sendpage = sock_no_sendpage,
614 .set_peek_off = sk_set_peek_off,
615#ifdef CONFIG_COMPAT
616 .compat_setsockopt = compat_sock_common_setsockopt,
617 .compat_getsockopt = compat_sock_common_getsockopt,
618#endif
619};
620
621static const struct net_proto_family inet6_family_ops = {
622 .family = PF_INET6,
623 .create = inet6_create,
624 .owner = THIS_MODULE,
625};
626
627int inet6_register_protosw(struct inet_protosw *p)
628{
629 struct list_head *lh;
630 struct inet_protosw *answer;
631 struct list_head *last_perm;
632 int protocol = p->protocol;
633 int ret;
634
635 spin_lock_bh(&inetsw6_lock);
636
637 ret = -EINVAL;
638 if (p->type >= SOCK_MAX)
639 goto out_illegal;
640
641 /* If we are trying to override a permanent protocol, bail. */
642 answer = NULL;
643 ret = -EPERM;
644 last_perm = &inetsw6[p->type];
645 list_for_each(lh, &inetsw6[p->type]) {
646 answer = list_entry(lh, struct inet_protosw, list);
647
648 /* Check only the non-wild match. */
649 if (INET_PROTOSW_PERMANENT & answer->flags) {
650 if (protocol == answer->protocol)
651 break;
652 last_perm = lh;
653 }
654
655 answer = NULL;
656 }
657 if (answer)
658 goto out_permanent;
659
660 /* Add the new entry after the last permanent entry if any, so that
661 * the new entry does not override a permanent entry when matched with
662 * a wild-card protocol. But it is allowed to override any existing
663 * non-permanent entry. This means that when we remove this entry, the
664 * system automatically returns to the old behavior.
665 */
666 list_add_rcu(&p->list, last_perm);
667 ret = 0;
668out:
669 spin_unlock_bh(&inetsw6_lock);
670 return ret;
671
672out_permanent:
673 pr_err("Attempt to override permanent protocol %d\n", protocol);
674 goto out;
675
676out_illegal:
677 pr_err("Ignoring attempt to register invalid socket type %d\n",
678 p->type);
679 goto out;
680}
681EXPORT_SYMBOL(inet6_register_protosw);
682
683void
684inet6_unregister_protosw(struct inet_protosw *p)
685{
686 if (INET_PROTOSW_PERMANENT & p->flags) {
687 pr_err("Attempt to unregister permanent protocol %d\n",
688 p->protocol);
689 } else {
690 spin_lock_bh(&inetsw6_lock);
691 list_del_rcu(&p->list);
692 spin_unlock_bh(&inetsw6_lock);
693
694 synchronize_net();
695 }
696}
697EXPORT_SYMBOL(inet6_unregister_protosw);
698
699int inet6_sk_rebuild_header(struct sock *sk)
700{
701 struct ipv6_pinfo *np = inet6_sk(sk);
702 struct dst_entry *dst;
703
704 dst = __sk_dst_check(sk, np->dst_cookie);
705
706 if (!dst) {
707 struct inet_sock *inet = inet_sk(sk);
708 struct in6_addr *final_p, final;
709 struct flowi6 fl6;
710
711 memset(&fl6, 0, sizeof(fl6));
712 fl6.flowi6_proto = sk->sk_protocol;
713 fl6.daddr = sk->sk_v6_daddr;
714 fl6.saddr = np->saddr;
715 fl6.flowlabel = np->flow_label;
716 fl6.flowi6_oif = sk->sk_bound_dev_if;
717 fl6.flowi6_mark = sk->sk_mark;
718 fl6.fl6_dport = inet->inet_dport;
719 fl6.fl6_sport = inet->inet_sport;
720 fl6.flowi6_uid = sk->sk_uid;
721 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
722
723 rcu_read_lock();
724 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
725 &final);
726 rcu_read_unlock();
727
728 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
729 if (IS_ERR(dst)) {
730 sk->sk_route_caps = 0;
731 sk->sk_err_soft = -PTR_ERR(dst);
732 return PTR_ERR(dst);
733 }
734
735 ip6_dst_store(sk, dst, NULL, NULL);
736 }
737
738 return 0;
739}
740EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
741
742bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
743 const struct inet6_skb_parm *opt)
744{
745 const struct ipv6_pinfo *np = inet6_sk(sk);
746
747 if (np->rxopt.all) {
748 if (((opt->flags & IP6SKB_HOPBYHOP) &&
749 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
750 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
751 np->rxopt.bits.rxflow) ||
752 (opt->srcrt && (np->rxopt.bits.srcrt ||
753 np->rxopt.bits.osrcrt)) ||
754 ((opt->dst1 || opt->dst0) &&
755 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
756 return true;
757 }
758 return false;
759}
760EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
761
762static struct packet_type ipv6_packet_type __read_mostly = {
763 .type = cpu_to_be16(ETH_P_IPV6),
764 .func = ipv6_rcv,
765};
766
767static int __init ipv6_packet_init(void)
768{
769 dev_add_pack(&ipv6_packet_type);
770 return 0;
771}
772
773static void ipv6_packet_cleanup(void)
774{
775 dev_remove_pack(&ipv6_packet_type);
776}
777
778static int __net_init ipv6_init_mibs(struct net *net)
779{
780 int i;
781
782 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
783 if (!net->mib.udp_stats_in6)
784 return -ENOMEM;
785 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
786 if (!net->mib.udplite_stats_in6)
787 goto err_udplite_mib;
788 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
789 if (!net->mib.ipv6_statistics)
790 goto err_ip_mib;
791
792 for_each_possible_cpu(i) {
793 struct ipstats_mib *af_inet6_stats;
794 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
795 u64_stats_init(&af_inet6_stats->syncp);
796 }
797
798
799 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
800 if (!net->mib.icmpv6_statistics)
801 goto err_icmp_mib;
802 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
803 GFP_KERNEL);
804 if (!net->mib.icmpv6msg_statistics)
805 goto err_icmpmsg_mib;
806 return 0;
807
808err_icmpmsg_mib:
809 free_percpu(net->mib.icmpv6_statistics);
810err_icmp_mib:
811 free_percpu(net->mib.ipv6_statistics);
812err_ip_mib:
813 free_percpu(net->mib.udplite_stats_in6);
814err_udplite_mib:
815 free_percpu(net->mib.udp_stats_in6);
816 return -ENOMEM;
817}
818
819static void ipv6_cleanup_mibs(struct net *net)
820{
821 free_percpu(net->mib.udp_stats_in6);
822 free_percpu(net->mib.udplite_stats_in6);
823 free_percpu(net->mib.ipv6_statistics);
824 free_percpu(net->mib.icmpv6_statistics);
825 kfree(net->mib.icmpv6msg_statistics);
826}
827
828static int __net_init inet6_net_init(struct net *net)
829{
830 int err = 0;
831
832 net->ipv6.sysctl.bindv6only = 0;
833 net->ipv6.sysctl.icmpv6_time = 1*HZ;
834 net->ipv6.sysctl.flowlabel_consistency = 1;
835 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
836 net->ipv6.sysctl.idgen_retries = 3;
837 net->ipv6.sysctl.idgen_delay = 1 * HZ;
838 net->ipv6.sysctl.flowlabel_state_ranges = 0;
839 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
840 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
841 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
842 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
843 atomic_set(&net->ipv6.fib6_sernum, 1);
844
845 err = ipv6_init_mibs(net);
846 if (err)
847 return err;
848#ifdef CONFIG_PROC_FS
849 err = udp6_proc_init(net);
850 if (err)
851 goto out;
852 err = tcp6_proc_init(net);
853 if (err)
854 goto proc_tcp6_fail;
855 err = ac6_proc_init(net);
856 if (err)
857 goto proc_ac6_fail;
858#endif
859 return err;
860
861#ifdef CONFIG_PROC_FS
862proc_ac6_fail:
863 tcp6_proc_exit(net);
864proc_tcp6_fail:
865 udp6_proc_exit(net);
866out:
867 ipv6_cleanup_mibs(net);
868 return err;
869#endif
870}
871
872static void __net_exit inet6_net_exit(struct net *net)
873{
874#ifdef CONFIG_PROC_FS
875 udp6_proc_exit(net);
876 tcp6_proc_exit(net);
877 ac6_proc_exit(net);
878#endif
879 ipv6_cleanup_mibs(net);
880}
881
882static struct pernet_operations inet6_net_ops = {
883 .init = inet6_net_init,
884 .exit = inet6_net_exit,
885};
886
887static const struct ipv6_stub ipv6_stub_impl = {
888 .ipv6_sock_mc_join = ipv6_sock_mc_join,
889 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
890 .ipv6_dst_lookup = ip6_dst_lookup,
891 .udpv6_encap_enable = udpv6_encap_enable,
892 .ndisc_send_na = ndisc_send_na,
893 .nd_tbl = &nd_tbl,
894};
895
896static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
897 .inet6_bind = __inet6_bind,
898};
899
900static int __init inet6_init(void)
901{
902 struct list_head *r;
903 int err = 0;
904
905 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
906
907 /* Register the socket-side information for inet6_create. */
908 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
909 INIT_LIST_HEAD(r);
910
911 if (disable_ipv6_mod) {
912 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
913 goto out;
914 }
915
916 err = proto_register(&tcpv6_prot, 1);
917 if (err)
918 goto out;
919
920 err = proto_register(&udpv6_prot, 1);
921 if (err)
922 goto out_unregister_tcp_proto;
923
924 err = proto_register(&udplitev6_prot, 1);
925 if (err)
926 goto out_unregister_udp_proto;
927
928 err = proto_register(&rawv6_prot, 1);
929 if (err)
930 goto out_unregister_udplite_proto;
931
932 err = proto_register(&pingv6_prot, 1);
933 if (err)
934 goto out_unregister_ping_proto;
935
936 /* We MUST register RAW sockets before we create the ICMP6,
937 * IGMP6, or NDISC control sockets.
938 */
939 err = rawv6_init();
940 if (err)
941 goto out_unregister_raw_proto;
942
943 /* Register the family here so that the init calls below will
944 * be able to create sockets. (?? is this dangerous ??)
945 */
946 err = sock_register(&inet6_family_ops);
947 if (err)
948 goto out_sock_register_fail;
949
950 /*
951 * ipngwg API draft makes clear that the correct semantics
952 * for TCP and UDP is to consider one TCP and UDP instance
953 * in a host available by both INET and INET6 APIs and
954 * able to communicate via both network protocols.
955 */
956
957 err = register_pernet_subsys(&inet6_net_ops);
958 if (err)
959 goto register_pernet_fail;
960 err = ip6_mr_init();
961 if (err)
962 goto ipmr_fail;
963 err = icmpv6_init();
964 if (err)
965 goto icmp_fail;
966 err = ndisc_init();
967 if (err)
968 goto ndisc_fail;
969 err = igmp6_init();
970 if (err)
971 goto igmp_fail;
972
973 err = ipv6_netfilter_init();
974 if (err)
975 goto netfilter_fail;
976 /* Create /proc/foo6 entries. */
977#ifdef CONFIG_PROC_FS
978 err = -ENOMEM;
979 if (raw6_proc_init())
980 goto proc_raw6_fail;
981 if (udplite6_proc_init())
982 goto proc_udplite6_fail;
983 if (ipv6_misc_proc_init())
984 goto proc_misc6_fail;
985 if (if6_proc_init())
986 goto proc_if6_fail;
987#endif
988 err = ip6_route_init();
989 if (err)
990 goto ip6_route_fail;
991 err = ndisc_late_init();
992 if (err)
993 goto ndisc_late_fail;
994 err = ip6_flowlabel_init();
995 if (err)
996 goto ip6_flowlabel_fail;
997 err = addrconf_init();
998 if (err)
999 goto addrconf_fail;
1000
1001 /* Init v6 extension headers. */
1002 err = ipv6_exthdrs_init();
1003 if (err)
1004 goto ipv6_exthdrs_fail;
1005
1006 err = ipv6_frag_init();
1007 if (err)
1008 goto ipv6_frag_fail;
1009
1010 /* Init v6 transport protocols. */
1011 err = udpv6_init();
1012 if (err)
1013 goto udpv6_fail;
1014
1015 err = udplitev6_init();
1016 if (err)
1017 goto udplitev6_fail;
1018
1019 err = udpv6_offload_init();
1020 if (err)
1021 goto udpv6_offload_fail;
1022
1023 err = tcpv6_init();
1024 if (err)
1025 goto tcpv6_fail;
1026
1027 err = ipv6_packet_init();
1028 if (err)
1029 goto ipv6_packet_fail;
1030
1031 err = pingv6_init();
1032 if (err)
1033 goto pingv6_fail;
1034
1035 err = calipso_init();
1036 if (err)
1037 goto calipso_fail;
1038
1039 err = seg6_init();
1040 if (err)
1041 goto seg6_fail;
1042
1043 err = igmp6_late_init();
1044 if (err)
1045 goto igmp6_late_err;
1046
1047#ifdef CONFIG_SYSCTL
1048 err = ipv6_sysctl_register();
1049 if (err)
1050 goto sysctl_fail;
1051#endif
1052
1053 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1054 wmb();
1055 ipv6_stub = &ipv6_stub_impl;
1056 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1057out:
1058 return err;
1059
1060#ifdef CONFIG_SYSCTL
1061sysctl_fail:
1062 igmp6_late_cleanup();
1063#endif
1064igmp6_late_err:
1065 seg6_exit();
1066seg6_fail:
1067 calipso_exit();
1068calipso_fail:
1069 pingv6_exit();
1070pingv6_fail:
1071 ipv6_packet_cleanup();
1072ipv6_packet_fail:
1073 tcpv6_exit();
1074tcpv6_fail:
1075 udpv6_offload_exit();
1076udpv6_offload_fail:
1077 udplitev6_exit();
1078udplitev6_fail:
1079 udpv6_exit();
1080udpv6_fail:
1081 ipv6_frag_exit();
1082ipv6_frag_fail:
1083 ipv6_exthdrs_exit();
1084ipv6_exthdrs_fail:
1085 addrconf_cleanup();
1086addrconf_fail:
1087 ip6_flowlabel_cleanup();
1088ip6_flowlabel_fail:
1089 ndisc_late_cleanup();
1090ndisc_late_fail:
1091 ip6_route_cleanup();
1092ip6_route_fail:
1093#ifdef CONFIG_PROC_FS
1094 if6_proc_exit();
1095proc_if6_fail:
1096 ipv6_misc_proc_exit();
1097proc_misc6_fail:
1098 udplite6_proc_exit();
1099proc_udplite6_fail:
1100 raw6_proc_exit();
1101proc_raw6_fail:
1102#endif
1103 ipv6_netfilter_fini();
1104netfilter_fail:
1105 igmp6_cleanup();
1106igmp_fail:
1107 ndisc_cleanup();
1108ndisc_fail:
1109 ip6_mr_cleanup();
1110icmp_fail:
1111 unregister_pernet_subsys(&inet6_net_ops);
1112ipmr_fail:
1113 icmpv6_cleanup();
1114register_pernet_fail:
1115 sock_unregister(PF_INET6);
1116 rtnl_unregister_all(PF_INET6);
1117out_sock_register_fail:
1118 rawv6_exit();
1119out_unregister_ping_proto:
1120 proto_unregister(&pingv6_prot);
1121out_unregister_raw_proto:
1122 proto_unregister(&rawv6_prot);
1123out_unregister_udplite_proto:
1124 proto_unregister(&udplitev6_prot);
1125out_unregister_udp_proto:
1126 proto_unregister(&udpv6_prot);
1127out_unregister_tcp_proto:
1128 proto_unregister(&tcpv6_prot);
1129 goto out;
1130}
1131module_init(inet6_init);
1132
1133MODULE_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
66#include <linux/uaccess.h>
67#include <linux/mroute6.h>
68
69#include "ip6_offload.h"
70
71MODULE_AUTHOR("Cast of dozens");
72MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
73MODULE_LICENSE("GPL");
74
75/* The inetsw6 table contains everything that inet6_create needs to
76 * build a new socket.
77 */
78static struct list_head inetsw6[SOCK_MAX];
79static DEFINE_SPINLOCK(inetsw6_lock);
80
81struct ipv6_params ipv6_defaults = {
82 .disable_ipv6 = 0,
83 .autoconf = 1,
84};
85
86static int disable_ipv6_mod;
87
88module_param_named(disable, disable_ipv6_mod, int, 0444);
89MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
90
91module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
92MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
93
94module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
95MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
96
97bool ipv6_mod_enabled(void)
98{
99 return disable_ipv6_mod == 0;
100}
101EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
102
103static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
104{
105 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
106
107 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
108}
109
110static int inet6_create(struct net *net, struct socket *sock, int protocol,
111 int kern)
112{
113 struct inet_sock *inet;
114 struct ipv6_pinfo *np;
115 struct sock *sk;
116 struct inet_protosw *answer;
117 struct proto *answer_prot;
118 unsigned char answer_flags;
119 int try_loading_module = 0;
120 int err;
121
122 if (protocol < 0 || protocol >= IPPROTO_MAX)
123 return -EINVAL;
124
125 /* Look for the requested type/protocol pair. */
126lookup_protocol:
127 err = -ESOCKTNOSUPPORT;
128 rcu_read_lock();
129 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
130
131 err = 0;
132 /* Check the non-wild match. */
133 if (protocol == answer->protocol) {
134 if (protocol != IPPROTO_IP)
135 break;
136 } else {
137 /* Check for the two wild cases. */
138 if (IPPROTO_IP == protocol) {
139 protocol = answer->protocol;
140 break;
141 }
142 if (IPPROTO_IP == answer->protocol)
143 break;
144 }
145 err = -EPROTONOSUPPORT;
146 }
147
148 if (err) {
149 if (try_loading_module < 2) {
150 rcu_read_unlock();
151 /*
152 * Be more specific, e.g. net-pf-10-proto-132-type-1
153 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
154 */
155 if (++try_loading_module == 1)
156 request_module("net-pf-%d-proto-%d-type-%d",
157 PF_INET6, protocol, sock->type);
158 /*
159 * Fall back to generic, e.g. net-pf-10-proto-132
160 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
161 */
162 else
163 request_module("net-pf-%d-proto-%d",
164 PF_INET6, protocol);
165 goto lookup_protocol;
166 } else
167 goto out_rcu_unlock;
168 }
169
170 err = -EPERM;
171 if (sock->type == SOCK_RAW && !kern &&
172 !ns_capable(net->user_ns, CAP_NET_RAW))
173 goto out_rcu_unlock;
174
175 sock->ops = answer->ops;
176 answer_prot = answer->prot;
177 answer_flags = answer->flags;
178 rcu_read_unlock();
179
180 WARN_ON(!answer_prot->slab);
181
182 err = -ENOBUFS;
183 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
184 if (!sk)
185 goto out;
186
187 sock_init_data(sock, sk);
188
189 err = 0;
190 if (INET_PROTOSW_REUSE & answer_flags)
191 sk->sk_reuse = SK_CAN_REUSE;
192
193 inet = inet_sk(sk);
194 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
195
196 if (SOCK_RAW == sock->type) {
197 inet->inet_num = protocol;
198 if (IPPROTO_RAW == protocol)
199 inet->hdrincl = 1;
200 }
201
202 sk->sk_destruct = inet_sock_destruct;
203 sk->sk_family = PF_INET6;
204 sk->sk_protocol = protocol;
205
206 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
207
208 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
209 np->hop_limit = -1;
210 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
211 np->mc_loop = 1;
212 np->mc_all = 1;
213 np->pmtudisc = IPV6_PMTUDISC_WANT;
214 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
215 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
216
217 /* Init the ipv4 part of the socket since we can have sockets
218 * using v6 API for ipv4.
219 */
220 inet->uc_ttl = -1;
221
222 inet->mc_loop = 1;
223 inet->mc_ttl = 1;
224 inet->mc_index = 0;
225 RCU_INIT_POINTER(inet->mc_list, NULL);
226 inet->rcv_tos = 0;
227
228 if (net->ipv4.sysctl_ip_no_pmtu_disc)
229 inet->pmtudisc = IP_PMTUDISC_DONT;
230 else
231 inet->pmtudisc = IP_PMTUDISC_WANT;
232 /*
233 * Increment only the relevant sk_prot->socks debug field, this changes
234 * the previous behaviour of incrementing both the equivalent to
235 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
236 *
237 * This allows better debug granularity as we'll know exactly how many
238 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
239 * transport protocol socks. -acme
240 */
241 sk_refcnt_debug_inc(sk);
242
243 if (inet->inet_num) {
244 /* It assumes that any protocol which allows
245 * the user to assign a number at socket
246 * creation time automatically shares.
247 */
248 inet->inet_sport = htons(inet->inet_num);
249 err = sk->sk_prot->hash(sk);
250 if (err) {
251 sk_common_release(sk);
252 goto out;
253 }
254 }
255 if (sk->sk_prot->init) {
256 err = sk->sk_prot->init(sk);
257 if (err) {
258 sk_common_release(sk);
259 goto out;
260 }
261 }
262
263 if (!kern) {
264 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
265 if (err) {
266 sk_common_release(sk);
267 goto out;
268 }
269 }
270out:
271 return err;
272out_rcu_unlock:
273 rcu_read_unlock();
274 goto out;
275}
276
277static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
278 u32 flags)
279{
280 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
281 struct inet_sock *inet = inet_sk(sk);
282 struct ipv6_pinfo *np = inet6_sk(sk);
283 struct net *net = sock_net(sk);
284 __be32 v4addr = 0;
285 unsigned short snum;
286 bool saved_ipv6only;
287 int addr_type = 0;
288 int err = 0;
289
290 if (addr->sin6_family != AF_INET6)
291 return -EAFNOSUPPORT;
292
293 addr_type = ipv6_addr_type(&addr->sin6_addr);
294 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
295 return -EINVAL;
296
297 snum = ntohs(addr->sin6_port);
298 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
299 snum && inet_port_requires_bind_service(net, snum) &&
300 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
301 return -EACCES;
302
303 if (flags & BIND_WITH_LOCK)
304 lock_sock(sk);
305
306 /* Check these errors (active socket, double bind). */
307 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
308 err = -EINVAL;
309 goto out;
310 }
311
312 /* Check if the address belongs to the host. */
313 if (addr_type == IPV6_ADDR_MAPPED) {
314 struct net_device *dev = NULL;
315 int chk_addr_ret;
316
317 /* Binding to v4-mapped address on a v6-only socket
318 * makes no sense
319 */
320 if (sk->sk_ipv6only) {
321 err = -EINVAL;
322 goto out;
323 }
324
325 rcu_read_lock();
326 if (sk->sk_bound_dev_if) {
327 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
328 if (!dev) {
329 err = -ENODEV;
330 goto out_unlock;
331 }
332 }
333
334 /* Reproduce AF_INET checks to make the bindings consistent */
335 v4addr = addr->sin6_addr.s6_addr32[3];
336 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
337 rcu_read_unlock();
338
339 if (!inet_can_nonlocal_bind(net, inet) &&
340 v4addr != htonl(INADDR_ANY) &&
341 chk_addr_ret != RTN_LOCAL &&
342 chk_addr_ret != RTN_MULTICAST &&
343 chk_addr_ret != RTN_BROADCAST) {
344 err = -EADDRNOTAVAIL;
345 goto out;
346 }
347 } else {
348 if (addr_type != IPV6_ADDR_ANY) {
349 struct net_device *dev = NULL;
350
351 rcu_read_lock();
352 if (__ipv6_addr_needs_scope_id(addr_type)) {
353 if (addr_len >= sizeof(struct sockaddr_in6) &&
354 addr->sin6_scope_id) {
355 /* Override any existing binding, if another one
356 * is supplied by user.
357 */
358 sk->sk_bound_dev_if = addr->sin6_scope_id;
359 }
360
361 /* Binding to link-local address requires an interface */
362 if (!sk->sk_bound_dev_if) {
363 err = -EINVAL;
364 goto out_unlock;
365 }
366 }
367
368 if (sk->sk_bound_dev_if) {
369 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
370 if (!dev) {
371 err = -ENODEV;
372 goto out_unlock;
373 }
374 }
375
376 /* ipv4 addr of the socket is invalid. Only the
377 * unspecified and mapped address have a v4 equivalent.
378 */
379 v4addr = LOOPBACK4_IPV6;
380 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
381 if (!ipv6_can_nonlocal_bind(net, inet) &&
382 !ipv6_chk_addr(net, &addr->sin6_addr,
383 dev, 0)) {
384 err = -EADDRNOTAVAIL;
385 goto out_unlock;
386 }
387 }
388 rcu_read_unlock();
389 }
390 }
391
392 inet->inet_rcv_saddr = v4addr;
393 inet->inet_saddr = v4addr;
394
395 sk->sk_v6_rcv_saddr = addr->sin6_addr;
396
397 if (!(addr_type & IPV6_ADDR_MULTICAST))
398 np->saddr = addr->sin6_addr;
399
400 saved_ipv6only = sk->sk_ipv6only;
401 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
402 sk->sk_ipv6only = 1;
403
404 /* Make sure we are allowed to bind here. */
405 if (snum || !(inet->bind_address_no_port ||
406 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
407 if (sk->sk_prot->get_port(sk, snum)) {
408 sk->sk_ipv6only = saved_ipv6only;
409 inet_reset_saddr(sk);
410 err = -EADDRINUSE;
411 goto out;
412 }
413 if (!(flags & BIND_FROM_BPF)) {
414 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
415 if (err) {
416 sk->sk_ipv6only = saved_ipv6only;
417 inet_reset_saddr(sk);
418 goto out;
419 }
420 }
421 }
422
423 if (addr_type != IPV6_ADDR_ANY)
424 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
425 if (snum)
426 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
427 inet->inet_sport = htons(inet->inet_num);
428 inet->inet_dport = 0;
429 inet->inet_daddr = 0;
430out:
431 if (flags & BIND_WITH_LOCK)
432 release_sock(sk);
433 return err;
434out_unlock:
435 rcu_read_unlock();
436 goto out;
437}
438
439/* bind for INET6 API */
440int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
441{
442 struct sock *sk = sock->sk;
443 u32 flags = BIND_WITH_LOCK;
444 int err = 0;
445
446 /* If the socket has its own bind function then use it. */
447 if (sk->sk_prot->bind)
448 return sk->sk_prot->bind(sk, uaddr, addr_len);
449
450 if (addr_len < SIN6_LEN_RFC2133)
451 return -EINVAL;
452
453 /* BPF prog is run before any checks are done so that if the prog
454 * changes context in a wrong way it will be caught.
455 */
456 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
457 BPF_CGROUP_INET6_BIND, &flags);
458 if (err)
459 return err;
460
461 return __inet6_bind(sk, uaddr, addr_len, flags);
462}
463EXPORT_SYMBOL(inet6_bind);
464
465int inet6_release(struct socket *sock)
466{
467 struct sock *sk = sock->sk;
468
469 if (!sk)
470 return -EINVAL;
471
472 /* Free mc lists */
473 ipv6_sock_mc_close(sk);
474
475 /* Free ac lists */
476 ipv6_sock_ac_close(sk);
477
478 return inet_release(sock);
479}
480EXPORT_SYMBOL(inet6_release);
481
482void inet6_destroy_sock(struct sock *sk)
483{
484 struct ipv6_pinfo *np = inet6_sk(sk);
485 struct sk_buff *skb;
486 struct ipv6_txoptions *opt;
487
488 /* Release rx options */
489
490 skb = xchg(&np->pktoptions, NULL);
491 kfree_skb(skb);
492
493 skb = xchg(&np->rxpmtu, NULL);
494 kfree_skb(skb);
495
496 /* Free flowlabels */
497 fl6_free_socklist(sk);
498
499 /* Free tx options */
500
501 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
502 if (opt) {
503 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
504 txopt_put(opt);
505 }
506}
507EXPORT_SYMBOL_GPL(inet6_destroy_sock);
508
509/*
510 * This does both peername and sockname.
511 */
512int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
513 int peer)
514{
515 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
516 struct sock *sk = sock->sk;
517 struct inet_sock *inet = inet_sk(sk);
518 struct ipv6_pinfo *np = inet6_sk(sk);
519
520 sin->sin6_family = AF_INET6;
521 sin->sin6_flowinfo = 0;
522 sin->sin6_scope_id = 0;
523 if (peer) {
524 if (!inet->inet_dport)
525 return -ENOTCONN;
526 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
527 peer == 1)
528 return -ENOTCONN;
529 sin->sin6_port = inet->inet_dport;
530 sin->sin6_addr = sk->sk_v6_daddr;
531 if (np->sndflow)
532 sin->sin6_flowinfo = np->flow_label;
533 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
534 BPF_CGROUP_INET6_GETPEERNAME,
535 NULL);
536 } else {
537 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
538 sin->sin6_addr = np->saddr;
539 else
540 sin->sin6_addr = sk->sk_v6_rcv_saddr;
541 sin->sin6_port = inet->inet_sport;
542 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
543 BPF_CGROUP_INET6_GETSOCKNAME,
544 NULL);
545 }
546 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
547 sk->sk_bound_dev_if);
548 return sizeof(*sin);
549}
550EXPORT_SYMBOL(inet6_getname);
551
552int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
553{
554 void __user *argp = (void __user *)arg;
555 struct sock *sk = sock->sk;
556 struct net *net = sock_net(sk);
557
558 switch (cmd) {
559 case SIOCADDRT:
560 case SIOCDELRT: {
561 struct in6_rtmsg rtmsg;
562
563 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
564 return -EFAULT;
565 return ipv6_route_ioctl(net, cmd, &rtmsg);
566 }
567 case SIOCSIFADDR:
568 return addrconf_add_ifaddr(net, argp);
569 case SIOCDIFADDR:
570 return addrconf_del_ifaddr(net, argp);
571 case SIOCSIFDSTADDR:
572 return addrconf_set_dstaddr(net, argp);
573 default:
574 if (!sk->sk_prot->ioctl)
575 return -ENOIOCTLCMD;
576 return sk->sk_prot->ioctl(sk, cmd, arg);
577 }
578 /*NOTREACHED*/
579 return 0;
580}
581EXPORT_SYMBOL(inet6_ioctl);
582
583#ifdef CONFIG_COMPAT
584struct compat_in6_rtmsg {
585 struct in6_addr rtmsg_dst;
586 struct in6_addr rtmsg_src;
587 struct in6_addr rtmsg_gateway;
588 u32 rtmsg_type;
589 u16 rtmsg_dst_len;
590 u16 rtmsg_src_len;
591 u32 rtmsg_metric;
592 u32 rtmsg_info;
593 u32 rtmsg_flags;
594 s32 rtmsg_ifindex;
595};
596
597static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
598 struct compat_in6_rtmsg __user *ur)
599{
600 struct in6_rtmsg rt;
601
602 if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
603 3 * sizeof(struct in6_addr)) ||
604 get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
605 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
606 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
607 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
608 get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
609 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
610 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
611 return -EFAULT;
612
613
614 return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
615}
616
617int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
618{
619 void __user *argp = compat_ptr(arg);
620 struct sock *sk = sock->sk;
621
622 switch (cmd) {
623 case SIOCADDRT:
624 case SIOCDELRT:
625 return inet6_compat_routing_ioctl(sk, cmd, argp);
626 default:
627 return -ENOIOCTLCMD;
628 }
629}
630EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
631#endif /* CONFIG_COMPAT */
632
633INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
634 size_t));
635int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
636{
637 struct sock *sk = sock->sk;
638
639 if (unlikely(inet_send_prepare(sk)))
640 return -EAGAIN;
641
642 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
643 sk, msg, size);
644}
645
646INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
647 size_t, int, int, int *));
648int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
649 int flags)
650{
651 struct sock *sk = sock->sk;
652 int addr_len = 0;
653 int err;
654
655 if (likely(!(flags & MSG_ERRQUEUE)))
656 sock_rps_record_flow(sk);
657
658 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
659 sk, msg, size, flags & MSG_DONTWAIT,
660 flags & ~MSG_DONTWAIT, &addr_len);
661 if (err >= 0)
662 msg->msg_namelen = addr_len;
663 return err;
664}
665
666const struct proto_ops inet6_stream_ops = {
667 .family = PF_INET6,
668 .owner = THIS_MODULE,
669 .release = inet6_release,
670 .bind = inet6_bind,
671 .connect = inet_stream_connect, /* ok */
672 .socketpair = sock_no_socketpair, /* a do nothing */
673 .accept = inet_accept, /* ok */
674 .getname = inet6_getname,
675 .poll = tcp_poll, /* ok */
676 .ioctl = inet6_ioctl, /* must change */
677 .gettstamp = sock_gettstamp,
678 .listen = inet_listen, /* ok */
679 .shutdown = inet_shutdown, /* ok */
680 .setsockopt = sock_common_setsockopt, /* ok */
681 .getsockopt = sock_common_getsockopt, /* ok */
682 .sendmsg = inet6_sendmsg, /* retpoline's sake */
683 .recvmsg = inet6_recvmsg, /* retpoline's sake */
684#ifdef CONFIG_MMU
685 .mmap = tcp_mmap,
686#endif
687 .sendpage = inet_sendpage,
688 .sendmsg_locked = tcp_sendmsg_locked,
689 .sendpage_locked = tcp_sendpage_locked,
690 .splice_read = tcp_splice_read,
691 .read_sock = tcp_read_sock,
692 .peek_len = tcp_peek_len,
693#ifdef CONFIG_COMPAT
694 .compat_ioctl = inet6_compat_ioctl,
695#endif
696 .set_rcvlowat = tcp_set_rcvlowat,
697};
698
699const struct proto_ops inet6_dgram_ops = {
700 .family = PF_INET6,
701 .owner = THIS_MODULE,
702 .release = inet6_release,
703 .bind = inet6_bind,
704 .connect = inet_dgram_connect, /* ok */
705 .socketpair = sock_no_socketpair, /* a do nothing */
706 .accept = sock_no_accept, /* a do nothing */
707 .getname = inet6_getname,
708 .poll = udp_poll, /* ok */
709 .ioctl = inet6_ioctl, /* must change */
710 .gettstamp = sock_gettstamp,
711 .listen = sock_no_listen, /* ok */
712 .shutdown = inet_shutdown, /* ok */
713 .setsockopt = sock_common_setsockopt, /* ok */
714 .getsockopt = sock_common_getsockopt, /* ok */
715 .sendmsg = inet6_sendmsg, /* retpoline's sake */
716 .recvmsg = inet6_recvmsg, /* retpoline's sake */
717 .read_sock = udp_read_sock,
718 .mmap = sock_no_mmap,
719 .sendpage = sock_no_sendpage,
720 .set_peek_off = sk_set_peek_off,
721#ifdef CONFIG_COMPAT
722 .compat_ioctl = inet6_compat_ioctl,
723#endif
724};
725
726static const struct net_proto_family inet6_family_ops = {
727 .family = PF_INET6,
728 .create = inet6_create,
729 .owner = THIS_MODULE,
730};
731
732int inet6_register_protosw(struct inet_protosw *p)
733{
734 struct list_head *lh;
735 struct inet_protosw *answer;
736 struct list_head *last_perm;
737 int protocol = p->protocol;
738 int ret;
739
740 spin_lock_bh(&inetsw6_lock);
741
742 ret = -EINVAL;
743 if (p->type >= SOCK_MAX)
744 goto out_illegal;
745
746 /* If we are trying to override a permanent protocol, bail. */
747 answer = NULL;
748 ret = -EPERM;
749 last_perm = &inetsw6[p->type];
750 list_for_each(lh, &inetsw6[p->type]) {
751 answer = list_entry(lh, struct inet_protosw, list);
752
753 /* Check only the non-wild match. */
754 if (INET_PROTOSW_PERMANENT & answer->flags) {
755 if (protocol == answer->protocol)
756 break;
757 last_perm = lh;
758 }
759
760 answer = NULL;
761 }
762 if (answer)
763 goto out_permanent;
764
765 /* Add the new entry after the last permanent entry if any, so that
766 * the new entry does not override a permanent entry when matched with
767 * a wild-card protocol. But it is allowed to override any existing
768 * non-permanent entry. This means that when we remove this entry, the
769 * system automatically returns to the old behavior.
770 */
771 list_add_rcu(&p->list, last_perm);
772 ret = 0;
773out:
774 spin_unlock_bh(&inetsw6_lock);
775 return ret;
776
777out_permanent:
778 pr_err("Attempt to override permanent protocol %d\n", protocol);
779 goto out;
780
781out_illegal:
782 pr_err("Ignoring attempt to register invalid socket type %d\n",
783 p->type);
784 goto out;
785}
786EXPORT_SYMBOL(inet6_register_protosw);
787
788void
789inet6_unregister_protosw(struct inet_protosw *p)
790{
791 if (INET_PROTOSW_PERMANENT & p->flags) {
792 pr_err("Attempt to unregister permanent protocol %d\n",
793 p->protocol);
794 } else {
795 spin_lock_bh(&inetsw6_lock);
796 list_del_rcu(&p->list);
797 spin_unlock_bh(&inetsw6_lock);
798
799 synchronize_net();
800 }
801}
802EXPORT_SYMBOL(inet6_unregister_protosw);
803
804int inet6_sk_rebuild_header(struct sock *sk)
805{
806 struct ipv6_pinfo *np = inet6_sk(sk);
807 struct dst_entry *dst;
808
809 dst = __sk_dst_check(sk, np->dst_cookie);
810
811 if (!dst) {
812 struct inet_sock *inet = inet_sk(sk);
813 struct in6_addr *final_p, final;
814 struct flowi6 fl6;
815
816 memset(&fl6, 0, sizeof(fl6));
817 fl6.flowi6_proto = sk->sk_protocol;
818 fl6.daddr = sk->sk_v6_daddr;
819 fl6.saddr = np->saddr;
820 fl6.flowlabel = np->flow_label;
821 fl6.flowi6_oif = sk->sk_bound_dev_if;
822 fl6.flowi6_mark = sk->sk_mark;
823 fl6.fl6_dport = inet->inet_dport;
824 fl6.fl6_sport = inet->inet_sport;
825 fl6.flowi6_uid = sk->sk_uid;
826 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
827
828 rcu_read_lock();
829 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
830 &final);
831 rcu_read_unlock();
832
833 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
834 if (IS_ERR(dst)) {
835 sk->sk_route_caps = 0;
836 sk->sk_err_soft = -PTR_ERR(dst);
837 return PTR_ERR(dst);
838 }
839
840 ip6_dst_store(sk, dst, NULL, NULL);
841 }
842
843 return 0;
844}
845EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
846
847bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
848 const struct inet6_skb_parm *opt)
849{
850 const struct ipv6_pinfo *np = inet6_sk(sk);
851
852 if (np->rxopt.all) {
853 if (((opt->flags & IP6SKB_HOPBYHOP) &&
854 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
855 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
856 np->rxopt.bits.rxflow) ||
857 (opt->srcrt && (np->rxopt.bits.srcrt ||
858 np->rxopt.bits.osrcrt)) ||
859 ((opt->dst1 || opt->dst0) &&
860 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
861 return true;
862 }
863 return false;
864}
865EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
866
867static struct packet_type ipv6_packet_type __read_mostly = {
868 .type = cpu_to_be16(ETH_P_IPV6),
869 .func = ipv6_rcv,
870 .list_func = ipv6_list_rcv,
871};
872
873static int __init ipv6_packet_init(void)
874{
875 dev_add_pack(&ipv6_packet_type);
876 return 0;
877}
878
879static void ipv6_packet_cleanup(void)
880{
881 dev_remove_pack(&ipv6_packet_type);
882}
883
884static int __net_init ipv6_init_mibs(struct net *net)
885{
886 int i;
887
888 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
889 if (!net->mib.udp_stats_in6)
890 return -ENOMEM;
891 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
892 if (!net->mib.udplite_stats_in6)
893 goto err_udplite_mib;
894 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
895 if (!net->mib.ipv6_statistics)
896 goto err_ip_mib;
897
898 for_each_possible_cpu(i) {
899 struct ipstats_mib *af_inet6_stats;
900 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
901 u64_stats_init(&af_inet6_stats->syncp);
902 }
903
904
905 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
906 if (!net->mib.icmpv6_statistics)
907 goto err_icmp_mib;
908 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
909 GFP_KERNEL);
910 if (!net->mib.icmpv6msg_statistics)
911 goto err_icmpmsg_mib;
912 return 0;
913
914err_icmpmsg_mib:
915 free_percpu(net->mib.icmpv6_statistics);
916err_icmp_mib:
917 free_percpu(net->mib.ipv6_statistics);
918err_ip_mib:
919 free_percpu(net->mib.udplite_stats_in6);
920err_udplite_mib:
921 free_percpu(net->mib.udp_stats_in6);
922 return -ENOMEM;
923}
924
925static void ipv6_cleanup_mibs(struct net *net)
926{
927 free_percpu(net->mib.udp_stats_in6);
928 free_percpu(net->mib.udplite_stats_in6);
929 free_percpu(net->mib.ipv6_statistics);
930 free_percpu(net->mib.icmpv6_statistics);
931 kfree(net->mib.icmpv6msg_statistics);
932}
933
934static int __net_init inet6_net_init(struct net *net)
935{
936 int err = 0;
937
938 net->ipv6.sysctl.bindv6only = 0;
939 net->ipv6.sysctl.icmpv6_time = 1*HZ;
940 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
941 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
942 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
943
944 /* By default, rate limit error messages.
945 * Except for pmtu discovery, it would break it.
946 * proc_do_large_bitmap needs pointer to the bitmap.
947 */
948 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
949 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
950 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
951
952 net->ipv6.sysctl.flowlabel_consistency = 1;
953 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
954 net->ipv6.sysctl.idgen_retries = 3;
955 net->ipv6.sysctl.idgen_delay = 1 * HZ;
956 net->ipv6.sysctl.flowlabel_state_ranges = 0;
957 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
958 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
959 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
960 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
961 net->ipv6.sysctl.fib_notify_on_flag_change = 0;
962 atomic_set(&net->ipv6.fib6_sernum, 1);
963
964 err = ipv6_init_mibs(net);
965 if (err)
966 return err;
967#ifdef CONFIG_PROC_FS
968 err = udp6_proc_init(net);
969 if (err)
970 goto out;
971 err = tcp6_proc_init(net);
972 if (err)
973 goto proc_tcp6_fail;
974 err = ac6_proc_init(net);
975 if (err)
976 goto proc_ac6_fail;
977#endif
978 return err;
979
980#ifdef CONFIG_PROC_FS
981proc_ac6_fail:
982 tcp6_proc_exit(net);
983proc_tcp6_fail:
984 udp6_proc_exit(net);
985out:
986 ipv6_cleanup_mibs(net);
987 return err;
988#endif
989}
990
991static void __net_exit inet6_net_exit(struct net *net)
992{
993#ifdef CONFIG_PROC_FS
994 udp6_proc_exit(net);
995 tcp6_proc_exit(net);
996 ac6_proc_exit(net);
997#endif
998 ipv6_cleanup_mibs(net);
999}
1000
1001static struct pernet_operations inet6_net_ops = {
1002 .init = inet6_net_init,
1003 .exit = inet6_net_exit,
1004};
1005
1006static int ipv6_route_input(struct sk_buff *skb)
1007{
1008 ip6_route_input(skb);
1009 return skb_dst(skb)->error;
1010}
1011
1012static const struct ipv6_stub ipv6_stub_impl = {
1013 .ipv6_sock_mc_join = ipv6_sock_mc_join,
1014 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1015 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1016 .ipv6_route_input = ipv6_route_input,
1017 .fib6_get_table = fib6_get_table,
1018 .fib6_table_lookup = fib6_table_lookup,
1019 .fib6_lookup = fib6_lookup,
1020 .fib6_select_path = fib6_select_path,
1021 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1022 .fib6_nh_init = fib6_nh_init,
1023 .fib6_nh_release = fib6_nh_release,
1024 .fib6_update_sernum = fib6_update_sernum_stub,
1025 .fib6_rt_update = fib6_rt_update,
1026 .ip6_del_rt = ip6_del_rt,
1027 .udpv6_encap_enable = udpv6_encap_enable,
1028 .ndisc_send_na = ndisc_send_na,
1029#if IS_ENABLED(CONFIG_XFRM)
1030 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1031 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1032 .xfrm6_rcv_encap = xfrm6_rcv_encap,
1033#endif
1034 .nd_tbl = &nd_tbl,
1035 .ipv6_fragment = ip6_fragment,
1036 .ipv6_dev_find = ipv6_dev_find,
1037};
1038
1039static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1040 .inet6_bind = __inet6_bind,
1041 .udp6_lib_lookup = __udp6_lib_lookup,
1042};
1043
1044static int __init inet6_init(void)
1045{
1046 struct list_head *r;
1047 int err = 0;
1048
1049 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1050
1051 /* Register the socket-side information for inet6_create. */
1052 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1053 INIT_LIST_HEAD(r);
1054
1055 if (disable_ipv6_mod) {
1056 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1057 goto out;
1058 }
1059
1060 err = proto_register(&tcpv6_prot, 1);
1061 if (err)
1062 goto out;
1063
1064 err = proto_register(&udpv6_prot, 1);
1065 if (err)
1066 goto out_unregister_tcp_proto;
1067
1068 err = proto_register(&udplitev6_prot, 1);
1069 if (err)
1070 goto out_unregister_udp_proto;
1071
1072 err = proto_register(&rawv6_prot, 1);
1073 if (err)
1074 goto out_unregister_udplite_proto;
1075
1076 err = proto_register(&pingv6_prot, 1);
1077 if (err)
1078 goto out_unregister_raw_proto;
1079
1080 /* We MUST register RAW sockets before we create the ICMP6,
1081 * IGMP6, or NDISC control sockets.
1082 */
1083 err = rawv6_init();
1084 if (err)
1085 goto out_unregister_ping_proto;
1086
1087 /* Register the family here so that the init calls below will
1088 * be able to create sockets. (?? is this dangerous ??)
1089 */
1090 err = sock_register(&inet6_family_ops);
1091 if (err)
1092 goto out_sock_register_fail;
1093
1094 /*
1095 * ipngwg API draft makes clear that the correct semantics
1096 * for TCP and UDP is to consider one TCP and UDP instance
1097 * in a host available by both INET and INET6 APIs and
1098 * able to communicate via both network protocols.
1099 */
1100
1101 err = register_pernet_subsys(&inet6_net_ops);
1102 if (err)
1103 goto register_pernet_fail;
1104 err = ip6_mr_init();
1105 if (err)
1106 goto ipmr_fail;
1107 err = icmpv6_init();
1108 if (err)
1109 goto icmp_fail;
1110 err = ndisc_init();
1111 if (err)
1112 goto ndisc_fail;
1113 err = igmp6_init();
1114 if (err)
1115 goto igmp_fail;
1116
1117 err = ipv6_netfilter_init();
1118 if (err)
1119 goto netfilter_fail;
1120 /* Create /proc/foo6 entries. */
1121#ifdef CONFIG_PROC_FS
1122 err = -ENOMEM;
1123 if (raw6_proc_init())
1124 goto proc_raw6_fail;
1125 if (udplite6_proc_init())
1126 goto proc_udplite6_fail;
1127 if (ipv6_misc_proc_init())
1128 goto proc_misc6_fail;
1129 if (if6_proc_init())
1130 goto proc_if6_fail;
1131#endif
1132 err = ip6_route_init();
1133 if (err)
1134 goto ip6_route_fail;
1135 err = ndisc_late_init();
1136 if (err)
1137 goto ndisc_late_fail;
1138 err = ip6_flowlabel_init();
1139 if (err)
1140 goto ip6_flowlabel_fail;
1141 err = ipv6_anycast_init();
1142 if (err)
1143 goto ipv6_anycast_fail;
1144 err = addrconf_init();
1145 if (err)
1146 goto addrconf_fail;
1147
1148 /* Init v6 extension headers. */
1149 err = ipv6_exthdrs_init();
1150 if (err)
1151 goto ipv6_exthdrs_fail;
1152
1153 err = ipv6_frag_init();
1154 if (err)
1155 goto ipv6_frag_fail;
1156
1157 /* Init v6 transport protocols. */
1158 err = udpv6_init();
1159 if (err)
1160 goto udpv6_fail;
1161
1162 err = udplitev6_init();
1163 if (err)
1164 goto udplitev6_fail;
1165
1166 err = udpv6_offload_init();
1167 if (err)
1168 goto udpv6_offload_fail;
1169
1170 err = tcpv6_init();
1171 if (err)
1172 goto tcpv6_fail;
1173
1174 err = ipv6_packet_init();
1175 if (err)
1176 goto ipv6_packet_fail;
1177
1178 err = pingv6_init();
1179 if (err)
1180 goto pingv6_fail;
1181
1182 err = calipso_init();
1183 if (err)
1184 goto calipso_fail;
1185
1186 err = seg6_init();
1187 if (err)
1188 goto seg6_fail;
1189
1190 err = rpl_init();
1191 if (err)
1192 goto rpl_fail;
1193
1194 err = igmp6_late_init();
1195 if (err)
1196 goto igmp6_late_err;
1197
1198#ifdef CONFIG_SYSCTL
1199 err = ipv6_sysctl_register();
1200 if (err)
1201 goto sysctl_fail;
1202#endif
1203
1204 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1205 wmb();
1206 ipv6_stub = &ipv6_stub_impl;
1207 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1208out:
1209 return err;
1210
1211#ifdef CONFIG_SYSCTL
1212sysctl_fail:
1213 igmp6_late_cleanup();
1214#endif
1215igmp6_late_err:
1216 rpl_exit();
1217rpl_fail:
1218 seg6_exit();
1219seg6_fail:
1220 calipso_exit();
1221calipso_fail:
1222 pingv6_exit();
1223pingv6_fail:
1224 ipv6_packet_cleanup();
1225ipv6_packet_fail:
1226 tcpv6_exit();
1227tcpv6_fail:
1228 udpv6_offload_exit();
1229udpv6_offload_fail:
1230 udplitev6_exit();
1231udplitev6_fail:
1232 udpv6_exit();
1233udpv6_fail:
1234 ipv6_frag_exit();
1235ipv6_frag_fail:
1236 ipv6_exthdrs_exit();
1237ipv6_exthdrs_fail:
1238 addrconf_cleanup();
1239addrconf_fail:
1240 ipv6_anycast_cleanup();
1241ipv6_anycast_fail:
1242 ip6_flowlabel_cleanup();
1243ip6_flowlabel_fail:
1244 ndisc_late_cleanup();
1245ndisc_late_fail:
1246 ip6_route_cleanup();
1247ip6_route_fail:
1248#ifdef CONFIG_PROC_FS
1249 if6_proc_exit();
1250proc_if6_fail:
1251 ipv6_misc_proc_exit();
1252proc_misc6_fail:
1253 udplite6_proc_exit();
1254proc_udplite6_fail:
1255 raw6_proc_exit();
1256proc_raw6_fail:
1257#endif
1258 ipv6_netfilter_fini();
1259netfilter_fail:
1260 igmp6_cleanup();
1261igmp_fail:
1262 ndisc_cleanup();
1263ndisc_fail:
1264 icmpv6_cleanup();
1265icmp_fail:
1266 ip6_mr_cleanup();
1267ipmr_fail:
1268 unregister_pernet_subsys(&inet6_net_ops);
1269register_pernet_fail:
1270 sock_unregister(PF_INET6);
1271 rtnl_unregister_all(PF_INET6);
1272out_sock_register_fail:
1273 rawv6_exit();
1274out_unregister_ping_proto:
1275 proto_unregister(&pingv6_prot);
1276out_unregister_raw_proto:
1277 proto_unregister(&rawv6_prot);
1278out_unregister_udplite_proto:
1279 proto_unregister(&udplitev6_prot);
1280out_unregister_udp_proto:
1281 proto_unregister(&udpv6_prot);
1282out_unregister_tcp_proto:
1283 proto_unregister(&tcpv6_prot);
1284 goto out;
1285}
1286module_init(inet6_init);
1287
1288MODULE_ALIAS_NETPROTO(PF_INET6);