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
71 MODULE_AUTHOR("Cast of dozens");
72 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
73 MODULE_LICENSE("GPL");
74
75 /* The inetsw6 table contains everything that inet6_create needs to
76 * build a new socket.
77 */
78 static struct list_head inetsw6[SOCK_MAX];
79 static DEFINE_SPINLOCK(inetsw6_lock);
80
81 struct ipv6_params ipv6_defaults = {
82 .disable_ipv6 = 0,
83 .autoconf = 1,
84 };
85
86 static int disable_ipv6_mod;
87
88 module_param_named(disable, disable_ipv6_mod, int, 0444);
89 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
90
91 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
92 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
93
94 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
95 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
96
ipv6_mod_enabled(void)97 bool ipv6_mod_enabled(void)
98 {
99 return disable_ipv6_mod == 0;
100 }
101 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
102
inet6_sk_generic(struct sock * sk)103 static __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
inet6_sock_destruct(struct sock * sk)110 void inet6_sock_destruct(struct sock *sk)
111 {
112 inet6_cleanup_sock(sk);
113 inet_sock_destruct(sk);
114 }
115 EXPORT_SYMBOL_GPL(inet6_sock_destruct);
116
inet6_create(struct net * net,struct socket * sock,int protocol,int kern)117 static int inet6_create(struct net *net, struct socket *sock, int protocol,
118 int kern)
119 {
120 struct inet_sock *inet;
121 struct ipv6_pinfo *np;
122 struct sock *sk;
123 struct inet_protosw *answer;
124 struct proto *answer_prot;
125 unsigned char answer_flags;
126 int try_loading_module = 0;
127 int err;
128
129 if (protocol < 0 || protocol >= IPPROTO_MAX)
130 return -EINVAL;
131
132 /* Look for the requested type/protocol pair. */
133 lookup_protocol:
134 err = -ESOCKTNOSUPPORT;
135 rcu_read_lock();
136 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
137
138 err = 0;
139 /* Check the non-wild match. */
140 if (protocol == answer->protocol) {
141 if (protocol != IPPROTO_IP)
142 break;
143 } else {
144 /* Check for the two wild cases. */
145 if (IPPROTO_IP == protocol) {
146 protocol = answer->protocol;
147 break;
148 }
149 if (IPPROTO_IP == answer->protocol)
150 break;
151 }
152 err = -EPROTONOSUPPORT;
153 }
154
155 if (err) {
156 if (try_loading_module < 2) {
157 rcu_read_unlock();
158 /*
159 * Be more specific, e.g. net-pf-10-proto-132-type-1
160 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
161 */
162 if (++try_loading_module == 1)
163 request_module("net-pf-%d-proto-%d-type-%d",
164 PF_INET6, protocol, sock->type);
165 /*
166 * Fall back to generic, e.g. net-pf-10-proto-132
167 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
168 */
169 else
170 request_module("net-pf-%d-proto-%d",
171 PF_INET6, protocol);
172 goto lookup_protocol;
173 } else
174 goto out_rcu_unlock;
175 }
176
177 err = -EPERM;
178 if (sock->type == SOCK_RAW && !kern &&
179 !ns_capable(net->user_ns, CAP_NET_RAW))
180 goto out_rcu_unlock;
181
182 sock->ops = answer->ops;
183 answer_prot = answer->prot;
184 answer_flags = answer->flags;
185 rcu_read_unlock();
186
187 WARN_ON(!answer_prot->slab);
188
189 err = -ENOBUFS;
190 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
191 if (!sk)
192 goto out;
193
194 sock_init_data(sock, sk);
195
196 err = 0;
197 if (INET_PROTOSW_REUSE & answer_flags)
198 sk->sk_reuse = SK_CAN_REUSE;
199
200 if (INET_PROTOSW_ICSK & answer_flags)
201 inet_init_csk_locks(sk);
202
203 inet = inet_sk(sk);
204 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
205
206 if (SOCK_RAW == sock->type) {
207 inet->inet_num = protocol;
208 if (IPPROTO_RAW == protocol)
209 inet->hdrincl = 1;
210 }
211
212 sk->sk_destruct = inet6_sock_destruct;
213 sk->sk_family = PF_INET6;
214 sk->sk_protocol = protocol;
215
216 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
217
218 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
219 np->hop_limit = -1;
220 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
221 np->mc_loop = 1;
222 np->mc_all = 1;
223 np->pmtudisc = IPV6_PMTUDISC_WANT;
224 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
225 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
226
227 /* Init the ipv4 part of the socket since we can have sockets
228 * using v6 API for ipv4.
229 */
230 inet->uc_ttl = -1;
231
232 inet->mc_loop = 1;
233 inet->mc_ttl = 1;
234 inet->mc_index = 0;
235 inet->mc_list = NULL;
236 inet->rcv_tos = 0;
237
238 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
239 inet->pmtudisc = IP_PMTUDISC_DONT;
240 else
241 inet->pmtudisc = IP_PMTUDISC_WANT;
242 /*
243 * Increment only the relevant sk_prot->socks debug field, this changes
244 * the previous behaviour of incrementing both the equivalent to
245 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
246 *
247 * This allows better debug granularity as we'll know exactly how many
248 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
249 * transport protocol socks. -acme
250 */
251 sk_refcnt_debug_inc(sk);
252
253 if (inet->inet_num) {
254 /* It assumes that any protocol which allows
255 * the user to assign a number at socket
256 * creation time automatically shares.
257 */
258 inet->inet_sport = htons(inet->inet_num);
259 err = sk->sk_prot->hash(sk);
260 if (err) {
261 sk_common_release(sk);
262 goto out;
263 }
264 }
265 if (sk->sk_prot->init) {
266 err = sk->sk_prot->init(sk);
267 if (err) {
268 sk_common_release(sk);
269 goto out;
270 }
271 }
272
273 if (!kern) {
274 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
275 if (err) {
276 sk_common_release(sk);
277 goto out;
278 }
279 }
280 out:
281 return err;
282 out_rcu_unlock:
283 rcu_read_unlock();
284 goto out;
285 }
286
__inet6_bind(struct sock * sk,struct sockaddr * uaddr,int addr_len,u32 flags)287 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
288 u32 flags)
289 {
290 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
291 struct inet_sock *inet = inet_sk(sk);
292 struct ipv6_pinfo *np = inet6_sk(sk);
293 struct net *net = sock_net(sk);
294 __be32 v4addr = 0;
295 unsigned short snum;
296 bool saved_ipv6only;
297 int addr_type = 0;
298 int err = 0;
299
300 if (addr->sin6_family != AF_INET6)
301 return -EAFNOSUPPORT;
302
303 addr_type = ipv6_addr_type(&addr->sin6_addr);
304 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
305 return -EINVAL;
306
307 snum = ntohs(addr->sin6_port);
308 if (snum && inet_is_local_unbindable_port(net, snum))
309 return -EPERM;
310 if (snum && inet_port_requires_bind_service(net, snum) &&
311 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
312 return -EACCES;
313
314 if (flags & BIND_WITH_LOCK)
315 lock_sock(sk);
316
317 /* Check these errors (active socket, double bind). */
318 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
319 err = -EINVAL;
320 goto out;
321 }
322
323 /* Check if the address belongs to the host. */
324 if (addr_type == IPV6_ADDR_MAPPED) {
325 struct net_device *dev = NULL;
326 int chk_addr_ret;
327
328 /* Binding to v4-mapped address on a v6-only socket
329 * makes no sense
330 */
331 if (sk->sk_ipv6only) {
332 err = -EINVAL;
333 goto out;
334 }
335
336 rcu_read_lock();
337 if (sk->sk_bound_dev_if) {
338 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
339 if (!dev) {
340 err = -ENODEV;
341 goto out_unlock;
342 }
343 }
344
345 /* Reproduce AF_INET checks to make the bindings consistent */
346 v4addr = addr->sin6_addr.s6_addr32[3];
347 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
348 rcu_read_unlock();
349
350 if (!inet_can_nonlocal_bind(net, inet) &&
351 v4addr != htonl(INADDR_ANY) &&
352 chk_addr_ret != RTN_LOCAL &&
353 chk_addr_ret != RTN_MULTICAST &&
354 chk_addr_ret != RTN_BROADCAST) {
355 err = -EADDRNOTAVAIL;
356 goto out;
357 }
358 } else {
359 if (addr_type != IPV6_ADDR_ANY) {
360 struct net_device *dev = NULL;
361
362 rcu_read_lock();
363 if (__ipv6_addr_needs_scope_id(addr_type)) {
364 if (addr_len >= sizeof(struct sockaddr_in6) &&
365 addr->sin6_scope_id) {
366 /* Override any existing binding, if another one
367 * is supplied by user.
368 */
369 sk->sk_bound_dev_if = addr->sin6_scope_id;
370 }
371
372 /* Binding to link-local address requires an interface */
373 if (!sk->sk_bound_dev_if) {
374 err = -EINVAL;
375 goto out_unlock;
376 }
377 }
378
379 if (sk->sk_bound_dev_if) {
380 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
381 if (!dev) {
382 err = -ENODEV;
383 goto out_unlock;
384 }
385 }
386
387 /* ipv4 addr of the socket is invalid. Only the
388 * unspecified and mapped address have a v4 equivalent.
389 */
390 v4addr = LOOPBACK4_IPV6;
391 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
392 if (!ipv6_can_nonlocal_bind(net, inet) &&
393 !ipv6_chk_addr(net, &addr->sin6_addr,
394 dev, 0)) {
395 err = -EADDRNOTAVAIL;
396 goto out_unlock;
397 }
398 }
399 rcu_read_unlock();
400 }
401 }
402
403 inet->inet_rcv_saddr = v4addr;
404 inet->inet_saddr = v4addr;
405
406 sk->sk_v6_rcv_saddr = addr->sin6_addr;
407
408 if (!(addr_type & IPV6_ADDR_MULTICAST))
409 np->saddr = addr->sin6_addr;
410
411 saved_ipv6only = sk->sk_ipv6only;
412 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
413 sk->sk_ipv6only = 1;
414
415 /* Make sure we are allowed to bind here. */
416 if (snum || !(inet->bind_address_no_port ||
417 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
418 if (sk->sk_prot->get_port(sk, snum)) {
419 sk->sk_ipv6only = saved_ipv6only;
420 inet_reset_saddr(sk);
421 err = -EADDRINUSE;
422 goto out;
423 }
424 if (!(flags & BIND_FROM_BPF)) {
425 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
426 if (err) {
427 sk->sk_ipv6only = saved_ipv6only;
428 inet_reset_saddr(sk);
429 goto out;
430 }
431 }
432 }
433
434 if (addr_type != IPV6_ADDR_ANY)
435 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
436 if (snum)
437 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
438 inet->inet_sport = htons(inet->inet_num);
439 inet->inet_dport = 0;
440 inet->inet_daddr = 0;
441 out:
442 if (flags & BIND_WITH_LOCK)
443 release_sock(sk);
444 return err;
445 out_unlock:
446 rcu_read_unlock();
447 goto out;
448 }
449
450 /* bind for INET6 API */
inet6_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)451 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
452 {
453 struct sock *sk = sock->sk;
454 int err = 0;
455
456 /* If the socket has its own bind function then use it. */
457 if (sk->sk_prot->bind)
458 return sk->sk_prot->bind(sk, uaddr, addr_len);
459
460 if (addr_len < SIN6_LEN_RFC2133)
461 return -EINVAL;
462
463 /* BPF prog is run before any checks are done so that if the prog
464 * changes context in a wrong way it will be caught.
465 */
466 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
467 if (err)
468 return err;
469
470 return __inet6_bind(sk, uaddr, addr_len, BIND_WITH_LOCK);
471 }
472 EXPORT_SYMBOL(inet6_bind);
473
inet6_release(struct socket * sock)474 int inet6_release(struct socket *sock)
475 {
476 struct sock *sk = sock->sk;
477
478 if (!sk)
479 return -EINVAL;
480
481 /* Free mc lists */
482 ipv6_sock_mc_close(sk);
483
484 /* Free ac lists */
485 ipv6_sock_ac_close(sk);
486
487 return inet_release(sock);
488 }
489 EXPORT_SYMBOL(inet6_release);
490
inet6_destroy_sock(struct sock * sk)491 void inet6_destroy_sock(struct sock *sk)
492 {
493 struct ipv6_pinfo *np = inet6_sk(sk);
494 struct sk_buff *skb;
495 struct ipv6_txoptions *opt;
496
497 /* Release rx options */
498
499 skb = xchg(&np->pktoptions, NULL);
500 kfree_skb(skb);
501
502 skb = xchg(&np->rxpmtu, NULL);
503 kfree_skb(skb);
504
505 /* Free flowlabels */
506 fl6_free_socklist(sk);
507
508 /* Free tx options */
509
510 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
511 if (opt) {
512 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
513 txopt_put(opt);
514 }
515 }
516 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
517
inet6_cleanup_sock(struct sock * sk)518 void inet6_cleanup_sock(struct sock *sk)
519 {
520 inet6_destroy_sock(sk);
521 }
522 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
523
524 /*
525 * This does both peername and sockname.
526 */
inet6_getname(struct socket * sock,struct sockaddr * uaddr,int peer)527 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
528 int peer)
529 {
530 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
531 struct sock *sk = sock->sk;
532 struct inet_sock *inet = inet_sk(sk);
533 struct ipv6_pinfo *np = inet6_sk(sk);
534
535 sin->sin6_family = AF_INET6;
536 sin->sin6_flowinfo = 0;
537 sin->sin6_scope_id = 0;
538 if (peer) {
539 if (!inet->inet_dport)
540 return -ENOTCONN;
541 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
542 peer == 1)
543 return -ENOTCONN;
544 sin->sin6_port = inet->inet_dport;
545 sin->sin6_addr = sk->sk_v6_daddr;
546 if (np->sndflow)
547 sin->sin6_flowinfo = np->flow_label;
548 } else {
549 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
550 sin->sin6_addr = np->saddr;
551 else
552 sin->sin6_addr = sk->sk_v6_rcv_saddr;
553 sin->sin6_port = inet->inet_sport;
554 }
555 if (cgroup_bpf_enabled)
556 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
557 peer ? BPF_CGROUP_INET6_GETPEERNAME :
558 BPF_CGROUP_INET6_GETSOCKNAME,
559 NULL);
560 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
561 sk->sk_bound_dev_if);
562 return sizeof(*sin);
563 }
564 EXPORT_SYMBOL(inet6_getname);
565
inet6_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)566 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
567 {
568 void __user *argp = (void __user *)arg;
569 struct sock *sk = sock->sk;
570 struct net *net = sock_net(sk);
571
572 switch (cmd) {
573 case SIOCADDRT:
574 case SIOCDELRT: {
575 struct in6_rtmsg rtmsg;
576
577 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
578 return -EFAULT;
579 return ipv6_route_ioctl(net, cmd, &rtmsg);
580 }
581 case SIOCSIFADDR:
582 return addrconf_add_ifaddr(net, argp);
583 case SIOCDIFADDR:
584 return addrconf_del_ifaddr(net, argp);
585 case SIOCSIFDSTADDR:
586 return addrconf_set_dstaddr(net, argp);
587 default:
588 if (!sk->sk_prot->ioctl)
589 return -ENOIOCTLCMD;
590 return sk->sk_prot->ioctl(sk, cmd, arg);
591 }
592 /*NOTREACHED*/
593 return 0;
594 }
595 EXPORT_SYMBOL(inet6_ioctl);
596
597 #ifdef CONFIG_COMPAT
598 struct compat_in6_rtmsg {
599 struct in6_addr rtmsg_dst;
600 struct in6_addr rtmsg_src;
601 struct in6_addr rtmsg_gateway;
602 u32 rtmsg_type;
603 u16 rtmsg_dst_len;
604 u16 rtmsg_src_len;
605 u32 rtmsg_metric;
606 u32 rtmsg_info;
607 u32 rtmsg_flags;
608 s32 rtmsg_ifindex;
609 };
610
inet6_compat_routing_ioctl(struct sock * sk,unsigned int cmd,struct compat_in6_rtmsg __user * ur)611 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
612 struct compat_in6_rtmsg __user *ur)
613 {
614 struct in6_rtmsg rt;
615
616 if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
617 3 * sizeof(struct in6_addr)) ||
618 get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
619 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
620 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
621 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
622 get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
623 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
624 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
625 return -EFAULT;
626
627
628 return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
629 }
630
inet6_compat_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)631 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
632 {
633 void __user *argp = compat_ptr(arg);
634 struct sock *sk = sock->sk;
635
636 switch (cmd) {
637 case SIOCADDRT:
638 case SIOCDELRT:
639 return inet6_compat_routing_ioctl(sk, cmd, argp);
640 default:
641 return -ENOIOCTLCMD;
642 }
643 }
644 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
645 #endif /* CONFIG_COMPAT */
646
647 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
648 size_t));
inet6_sendmsg(struct socket * sock,struct msghdr * msg,size_t size)649 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
650 {
651 struct sock *sk = sock->sk;
652
653 if (unlikely(inet_send_prepare(sk)))
654 return -EAGAIN;
655
656 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
657 sk, msg, size);
658 }
659
660 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
661 size_t, int, int, int *));
inet6_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)662 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
663 int flags)
664 {
665 struct sock *sk = sock->sk;
666 int addr_len = 0;
667 int err;
668
669 if (likely(!(flags & MSG_ERRQUEUE)))
670 sock_rps_record_flow(sk);
671
672 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
673 sk, msg, size, flags & MSG_DONTWAIT,
674 flags & ~MSG_DONTWAIT, &addr_len);
675 if (err >= 0)
676 msg->msg_namelen = addr_len;
677 return err;
678 }
679
680 const struct proto_ops inet6_stream_ops = {
681 .family = PF_INET6,
682 .owner = THIS_MODULE,
683 .release = inet6_release,
684 .bind = inet6_bind,
685 .connect = inet_stream_connect, /* ok */
686 .socketpair = sock_no_socketpair, /* a do nothing */
687 .accept = inet_accept, /* ok */
688 .getname = inet6_getname,
689 .poll = tcp_poll, /* ok */
690 .ioctl = inet6_ioctl, /* must change */
691 .gettstamp = sock_gettstamp,
692 .listen = inet_listen, /* ok */
693 .shutdown = inet_shutdown, /* ok */
694 .setsockopt = sock_common_setsockopt, /* ok */
695 .getsockopt = sock_common_getsockopt, /* ok */
696 .sendmsg = inet6_sendmsg, /* retpoline's sake */
697 .recvmsg = inet6_recvmsg, /* retpoline's sake */
698 #ifdef CONFIG_MMU
699 .mmap = tcp_mmap,
700 #endif
701 .sendpage = inet_sendpage,
702 .sendmsg_locked = tcp_sendmsg_locked,
703 .sendpage_locked = tcp_sendpage_locked,
704 .splice_read = tcp_splice_read,
705 .read_sock = tcp_read_sock,
706 .peek_len = tcp_peek_len,
707 #ifdef CONFIG_COMPAT
708 .compat_ioctl = inet6_compat_ioctl,
709 #endif
710 .set_rcvlowat = tcp_set_rcvlowat,
711 };
712
713 const struct proto_ops inet6_dgram_ops = {
714 .family = PF_INET6,
715 .owner = THIS_MODULE,
716 .release = inet6_release,
717 .bind = inet6_bind,
718 .connect = inet_dgram_connect, /* ok */
719 .socketpair = sock_no_socketpair, /* a do nothing */
720 .accept = sock_no_accept, /* a do nothing */
721 .getname = inet6_getname,
722 .poll = udp_poll, /* ok */
723 .ioctl = inet6_ioctl, /* must change */
724 .gettstamp = sock_gettstamp,
725 .listen = sock_no_listen, /* ok */
726 .shutdown = inet_shutdown, /* ok */
727 .setsockopt = sock_common_setsockopt, /* ok */
728 .getsockopt = sock_common_getsockopt, /* ok */
729 .sendmsg = inet6_sendmsg, /* retpoline's sake */
730 .recvmsg = inet6_recvmsg, /* retpoline's sake */
731 .mmap = sock_no_mmap,
732 .sendpage = sock_no_sendpage,
733 .set_peek_off = sk_set_peek_off,
734 #ifdef CONFIG_COMPAT
735 .compat_ioctl = inet6_compat_ioctl,
736 #endif
737 };
738
739 static const struct net_proto_family inet6_family_ops = {
740 .family = PF_INET6,
741 .create = inet6_create,
742 .owner = THIS_MODULE,
743 };
744
inet6_register_protosw(struct inet_protosw * p)745 int inet6_register_protosw(struct inet_protosw *p)
746 {
747 struct list_head *lh;
748 struct inet_protosw *answer;
749 struct list_head *last_perm;
750 int protocol = p->protocol;
751 int ret;
752
753 spin_lock_bh(&inetsw6_lock);
754
755 ret = -EINVAL;
756 if (p->type >= SOCK_MAX)
757 goto out_illegal;
758
759 /* If we are trying to override a permanent protocol, bail. */
760 answer = NULL;
761 ret = -EPERM;
762 last_perm = &inetsw6[p->type];
763 list_for_each(lh, &inetsw6[p->type]) {
764 answer = list_entry(lh, struct inet_protosw, list);
765
766 /* Check only the non-wild match. */
767 if (INET_PROTOSW_PERMANENT & answer->flags) {
768 if (protocol == answer->protocol)
769 break;
770 last_perm = lh;
771 }
772
773 answer = NULL;
774 }
775 if (answer)
776 goto out_permanent;
777
778 /* Add the new entry after the last permanent entry if any, so that
779 * the new entry does not override a permanent entry when matched with
780 * a wild-card protocol. But it is allowed to override any existing
781 * non-permanent entry. This means that when we remove this entry, the
782 * system automatically returns to the old behavior.
783 */
784 list_add_rcu(&p->list, last_perm);
785 ret = 0;
786 out:
787 spin_unlock_bh(&inetsw6_lock);
788 return ret;
789
790 out_permanent:
791 pr_err("Attempt to override permanent protocol %d\n", protocol);
792 goto out;
793
794 out_illegal:
795 pr_err("Ignoring attempt to register invalid socket type %d\n",
796 p->type);
797 goto out;
798 }
799 EXPORT_SYMBOL(inet6_register_protosw);
800
801 void
inet6_unregister_protosw(struct inet_protosw * p)802 inet6_unregister_protosw(struct inet_protosw *p)
803 {
804 if (INET_PROTOSW_PERMANENT & p->flags) {
805 pr_err("Attempt to unregister permanent protocol %d\n",
806 p->protocol);
807 } else {
808 spin_lock_bh(&inetsw6_lock);
809 list_del_rcu(&p->list);
810 spin_unlock_bh(&inetsw6_lock);
811
812 synchronize_net();
813 }
814 }
815 EXPORT_SYMBOL(inet6_unregister_protosw);
816
inet6_sk_rebuild_header(struct sock * sk)817 int inet6_sk_rebuild_header(struct sock *sk)
818 {
819 struct ipv6_pinfo *np = inet6_sk(sk);
820 struct dst_entry *dst;
821
822 dst = __sk_dst_check(sk, np->dst_cookie);
823
824 if (!dst) {
825 struct inet_sock *inet = inet_sk(sk);
826 struct in6_addr *final_p, final;
827 struct flowi6 fl6;
828
829 memset(&fl6, 0, sizeof(fl6));
830 fl6.flowi6_proto = sk->sk_protocol;
831 fl6.daddr = sk->sk_v6_daddr;
832 fl6.saddr = np->saddr;
833 fl6.flowlabel = np->flow_label;
834 fl6.flowi6_oif = sk->sk_bound_dev_if;
835 fl6.flowi6_mark = sk->sk_mark;
836 fl6.fl6_dport = inet->inet_dport;
837 fl6.fl6_sport = inet->inet_sport;
838 fl6.flowi6_uid = sk->sk_uid;
839 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
840
841 rcu_read_lock();
842 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
843 &final);
844 rcu_read_unlock();
845
846 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
847 if (IS_ERR(dst)) {
848 sk->sk_route_caps = 0;
849 sk->sk_err_soft = -PTR_ERR(dst);
850 return PTR_ERR(dst);
851 }
852
853 ip6_dst_store(sk, dst, NULL, NULL);
854 }
855
856 return 0;
857 }
858 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
859
ipv6_opt_accepted(const struct sock * sk,const struct sk_buff * skb,const struct inet6_skb_parm * opt)860 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
861 const struct inet6_skb_parm *opt)
862 {
863 const struct ipv6_pinfo *np = inet6_sk(sk);
864
865 if (np->rxopt.all) {
866 if (((opt->flags & IP6SKB_HOPBYHOP) &&
867 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
868 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
869 np->rxopt.bits.rxflow) ||
870 (opt->srcrt && (np->rxopt.bits.srcrt ||
871 np->rxopt.bits.osrcrt)) ||
872 ((opt->dst1 || opt->dst0) &&
873 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
874 return true;
875 }
876 return false;
877 }
878 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
879
880 static struct packet_type ipv6_packet_type __read_mostly = {
881 .type = cpu_to_be16(ETH_P_IPV6),
882 .func = ipv6_rcv,
883 .list_func = ipv6_list_rcv,
884 };
885
ipv6_packet_init(void)886 static int __init ipv6_packet_init(void)
887 {
888 dev_add_pack(&ipv6_packet_type);
889 return 0;
890 }
891
ipv6_packet_cleanup(void)892 static void ipv6_packet_cleanup(void)
893 {
894 dev_remove_pack(&ipv6_packet_type);
895 }
896
ipv6_init_mibs(struct net * net)897 static int __net_init ipv6_init_mibs(struct net *net)
898 {
899 int i;
900
901 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
902 if (!net->mib.udp_stats_in6)
903 return -ENOMEM;
904 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
905 if (!net->mib.udplite_stats_in6)
906 goto err_udplite_mib;
907 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
908 if (!net->mib.ipv6_statistics)
909 goto err_ip_mib;
910
911 for_each_possible_cpu(i) {
912 struct ipstats_mib *af_inet6_stats;
913 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
914 u64_stats_init(&af_inet6_stats->syncp);
915 }
916
917
918 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
919 if (!net->mib.icmpv6_statistics)
920 goto err_icmp_mib;
921 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
922 GFP_KERNEL);
923 if (!net->mib.icmpv6msg_statistics)
924 goto err_icmpmsg_mib;
925 return 0;
926
927 err_icmpmsg_mib:
928 free_percpu(net->mib.icmpv6_statistics);
929 err_icmp_mib:
930 free_percpu(net->mib.ipv6_statistics);
931 err_ip_mib:
932 free_percpu(net->mib.udplite_stats_in6);
933 err_udplite_mib:
934 free_percpu(net->mib.udp_stats_in6);
935 return -ENOMEM;
936 }
937
ipv6_cleanup_mibs(struct net * net)938 static void ipv6_cleanup_mibs(struct net *net)
939 {
940 free_percpu(net->mib.udp_stats_in6);
941 free_percpu(net->mib.udplite_stats_in6);
942 free_percpu(net->mib.ipv6_statistics);
943 free_percpu(net->mib.icmpv6_statistics);
944 kfree(net->mib.icmpv6msg_statistics);
945 }
946
inet6_net_init(struct net * net)947 static int __net_init inet6_net_init(struct net *net)
948 {
949 int err = 0;
950
951 net->ipv6.sysctl.bindv6only = 0;
952 net->ipv6.sysctl.icmpv6_time = 1*HZ;
953 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
954 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
955 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
956
957 /* By default, rate limit error messages.
958 * Except for pmtu discovery, it would break it.
959 * proc_do_large_bitmap needs pointer to the bitmap.
960 */
961 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
962 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
963 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
964
965 net->ipv6.sysctl.flowlabel_consistency = 1;
966 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
967 net->ipv6.sysctl.idgen_retries = 3;
968 net->ipv6.sysctl.idgen_delay = 1 * HZ;
969 net->ipv6.sysctl.flowlabel_state_ranges = 0;
970 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
971 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
972 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
973 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
974 atomic_set(&net->ipv6.fib6_sernum, 1);
975
976 err = ipv6_init_mibs(net);
977 if (err)
978 return err;
979 #ifdef CONFIG_PROC_FS
980 err = udp6_proc_init(net);
981 if (err)
982 goto out;
983 err = tcp6_proc_init(net);
984 if (err)
985 goto proc_tcp6_fail;
986 err = ac6_proc_init(net);
987 if (err)
988 goto proc_ac6_fail;
989 #endif
990 return err;
991
992 #ifdef CONFIG_PROC_FS
993 proc_ac6_fail:
994 tcp6_proc_exit(net);
995 proc_tcp6_fail:
996 udp6_proc_exit(net);
997 out:
998 ipv6_cleanup_mibs(net);
999 return err;
1000 #endif
1001 }
1002
inet6_net_exit(struct net * net)1003 static void __net_exit inet6_net_exit(struct net *net)
1004 {
1005 #ifdef CONFIG_PROC_FS
1006 udp6_proc_exit(net);
1007 tcp6_proc_exit(net);
1008 ac6_proc_exit(net);
1009 #endif
1010 ipv6_cleanup_mibs(net);
1011 }
1012
1013 static struct pernet_operations inet6_net_ops = {
1014 .init = inet6_net_init,
1015 .exit = inet6_net_exit,
1016 };
1017
ipv6_route_input(struct sk_buff * skb)1018 static int ipv6_route_input(struct sk_buff *skb)
1019 {
1020 ip6_route_input(skb);
1021 return skb_dst(skb)->error;
1022 }
1023
1024 static const struct ipv6_stub ipv6_stub_impl = {
1025 .ipv6_sock_mc_join = ipv6_sock_mc_join,
1026 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1027 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1028 .ipv6_route_input = ipv6_route_input,
1029 .fib6_get_table = fib6_get_table,
1030 .fib6_table_lookup = fib6_table_lookup,
1031 .fib6_lookup = fib6_lookup,
1032 .fib6_select_path = fib6_select_path,
1033 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1034 .fib6_nh_init = fib6_nh_init,
1035 .fib6_nh_release = fib6_nh_release,
1036 .fib6_update_sernum = fib6_update_sernum_stub,
1037 .fib6_rt_update = fib6_rt_update,
1038 .ip6_del_rt = ip6_del_rt,
1039 .udpv6_encap_enable = udpv6_encap_enable,
1040 .ndisc_send_na = ndisc_send_na,
1041 #if IS_ENABLED(CONFIG_XFRM)
1042 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1043 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1044 .xfrm6_rcv_encap = xfrm6_rcv_encap,
1045 #endif
1046 .nd_tbl = &nd_tbl,
1047 .ipv6_fragment = ip6_fragment,
1048 };
1049
1050 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1051 .inet6_bind = __inet6_bind,
1052 .udp6_lib_lookup = __udp6_lib_lookup,
1053 };
1054
inet6_init(void)1055 static int __init inet6_init(void)
1056 {
1057 struct list_head *r;
1058 int err = 0;
1059
1060 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1061
1062 /* Register the socket-side information for inet6_create. */
1063 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1064 INIT_LIST_HEAD(r);
1065
1066 if (disable_ipv6_mod) {
1067 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1068 goto out;
1069 }
1070
1071 err = proto_register(&tcpv6_prot, 1);
1072 if (err)
1073 goto out;
1074
1075 err = proto_register(&udpv6_prot, 1);
1076 if (err)
1077 goto out_unregister_tcp_proto;
1078
1079 err = proto_register(&udplitev6_prot, 1);
1080 if (err)
1081 goto out_unregister_udp_proto;
1082
1083 err = proto_register(&rawv6_prot, 1);
1084 if (err)
1085 goto out_unregister_udplite_proto;
1086
1087 err = proto_register(&pingv6_prot, 1);
1088 if (err)
1089 goto out_unregister_raw_proto;
1090
1091 /* We MUST register RAW sockets before we create the ICMP6,
1092 * IGMP6, or NDISC control sockets.
1093 */
1094 err = rawv6_init();
1095 if (err)
1096 goto out_unregister_ping_proto;
1097
1098 /* Register the family here so that the init calls below will
1099 * be able to create sockets. (?? is this dangerous ??)
1100 */
1101 err = sock_register(&inet6_family_ops);
1102 if (err)
1103 goto out_sock_register_fail;
1104
1105 /*
1106 * ipngwg API draft makes clear that the correct semantics
1107 * for TCP and UDP is to consider one TCP and UDP instance
1108 * in a host available by both INET and INET6 APIs and
1109 * able to communicate via both network protocols.
1110 */
1111
1112 err = register_pernet_subsys(&inet6_net_ops);
1113 if (err)
1114 goto register_pernet_fail;
1115 err = ip6_mr_init();
1116 if (err)
1117 goto ipmr_fail;
1118 err = icmpv6_init();
1119 if (err)
1120 goto icmp_fail;
1121 err = ndisc_init();
1122 if (err)
1123 goto ndisc_fail;
1124 err = igmp6_init();
1125 if (err)
1126 goto igmp_fail;
1127
1128 err = ipv6_netfilter_init();
1129 if (err)
1130 goto netfilter_fail;
1131 /* Create /proc/foo6 entries. */
1132 #ifdef CONFIG_PROC_FS
1133 err = -ENOMEM;
1134 if (raw6_proc_init())
1135 goto proc_raw6_fail;
1136 if (udplite6_proc_init())
1137 goto proc_udplite6_fail;
1138 if (ipv6_misc_proc_init())
1139 goto proc_misc6_fail;
1140 if (if6_proc_init())
1141 goto proc_if6_fail;
1142 #endif
1143 err = ip6_route_init();
1144 if (err)
1145 goto ip6_route_fail;
1146 err = ndisc_late_init();
1147 if (err)
1148 goto ndisc_late_fail;
1149 err = ip6_flowlabel_init();
1150 if (err)
1151 goto ip6_flowlabel_fail;
1152 err = ipv6_anycast_init();
1153 if (err)
1154 goto ipv6_anycast_fail;
1155 err = addrconf_init();
1156 if (err)
1157 goto addrconf_fail;
1158
1159 /* Init v6 extension headers. */
1160 err = ipv6_exthdrs_init();
1161 if (err)
1162 goto ipv6_exthdrs_fail;
1163
1164 err = ipv6_frag_init();
1165 if (err)
1166 goto ipv6_frag_fail;
1167
1168 /* Init v6 transport protocols. */
1169 err = udpv6_init();
1170 if (err)
1171 goto udpv6_fail;
1172
1173 err = udplitev6_init();
1174 if (err)
1175 goto udplitev6_fail;
1176
1177 err = udpv6_offload_init();
1178 if (err)
1179 goto udpv6_offload_fail;
1180
1181 err = tcpv6_init();
1182 if (err)
1183 goto tcpv6_fail;
1184
1185 err = ipv6_packet_init();
1186 if (err)
1187 goto ipv6_packet_fail;
1188
1189 err = pingv6_init();
1190 if (err)
1191 goto pingv6_fail;
1192
1193 err = calipso_init();
1194 if (err)
1195 goto calipso_fail;
1196
1197 err = seg6_init();
1198 if (err)
1199 goto seg6_fail;
1200
1201 err = rpl_init();
1202 if (err)
1203 goto rpl_fail;
1204
1205 err = igmp6_late_init();
1206 if (err)
1207 goto igmp6_late_err;
1208
1209 #ifdef CONFIG_SYSCTL
1210 err = ipv6_sysctl_register();
1211 if (err)
1212 goto sysctl_fail;
1213 #endif
1214
1215 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1216 wmb();
1217 ipv6_stub = &ipv6_stub_impl;
1218 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1219 out:
1220 return err;
1221
1222 #ifdef CONFIG_SYSCTL
1223 sysctl_fail:
1224 igmp6_late_cleanup();
1225 #endif
1226 igmp6_late_err:
1227 rpl_exit();
1228 rpl_fail:
1229 seg6_exit();
1230 seg6_fail:
1231 calipso_exit();
1232 calipso_fail:
1233 pingv6_exit();
1234 pingv6_fail:
1235 ipv6_packet_cleanup();
1236 ipv6_packet_fail:
1237 tcpv6_exit();
1238 tcpv6_fail:
1239 udpv6_offload_exit();
1240 udpv6_offload_fail:
1241 udplitev6_exit();
1242 udplitev6_fail:
1243 udpv6_exit();
1244 udpv6_fail:
1245 ipv6_frag_exit();
1246 ipv6_frag_fail:
1247 ipv6_exthdrs_exit();
1248 ipv6_exthdrs_fail:
1249 addrconf_cleanup();
1250 addrconf_fail:
1251 ipv6_anycast_cleanup();
1252 ipv6_anycast_fail:
1253 ip6_flowlabel_cleanup();
1254 ip6_flowlabel_fail:
1255 ndisc_late_cleanup();
1256 ndisc_late_fail:
1257 ip6_route_cleanup();
1258 ip6_route_fail:
1259 #ifdef CONFIG_PROC_FS
1260 if6_proc_exit();
1261 proc_if6_fail:
1262 ipv6_misc_proc_exit();
1263 proc_misc6_fail:
1264 udplite6_proc_exit();
1265 proc_udplite6_fail:
1266 raw6_proc_exit();
1267 proc_raw6_fail:
1268 #endif
1269 ipv6_netfilter_fini();
1270 netfilter_fail:
1271 igmp6_cleanup();
1272 igmp_fail:
1273 ndisc_cleanup();
1274 ndisc_fail:
1275 icmpv6_cleanup();
1276 icmp_fail:
1277 ip6_mr_cleanup();
1278 ipmr_fail:
1279 unregister_pernet_subsys(&inet6_net_ops);
1280 register_pernet_fail:
1281 sock_unregister(PF_INET6);
1282 rtnl_unregister_all(PF_INET6);
1283 out_sock_register_fail:
1284 rawv6_exit();
1285 out_unregister_ping_proto:
1286 proto_unregister(&pingv6_prot);
1287 out_unregister_raw_proto:
1288 proto_unregister(&rawv6_prot);
1289 out_unregister_udplite_proto:
1290 proto_unregister(&udplitev6_prot);
1291 out_unregister_udp_proto:
1292 proto_unregister(&udpv6_prot);
1293 out_unregister_tcp_proto:
1294 proto_unregister(&tcpv6_prot);
1295 goto out;
1296 }
1297 module_init(inet6_init);
1298
1299 MODULE_ALIAS_NETPROTO(PF_INET6);
1300