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