1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PF_INET6 socket protocol family
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Adapted from linux/net/ipv4/af_inet.c
10 *
11 * Fixes:
12 * piggy, Karl Knutson : Socket protocol table
13 * Hideaki YOSHIFUJI : sin6_scope_id support
14 * Arnaldo Melo : check proc_net_create return, cleanups
15 */
16
17#define pr_fmt(fmt) "IPv6: " fmt
18
19#include <linux/module.h>
20#include <linux/capability.h>
21#include <linux/errno.h>
22#include <linux/types.h>
23#include <linux/socket.h>
24#include <linux/in.h>
25#include <linux/kernel.h>
26#include <linux/timer.h>
27#include <linux/string.h>
28#include <linux/sockios.h>
29#include <linux/net.h>
30#include <linux/fcntl.h>
31#include <linux/mm.h>
32#include <linux/interrupt.h>
33#include <linux/proc_fs.h>
34#include <linux/stat.h>
35#include <linux/init.h>
36#include <linux/slab.h>
37
38#include <linux/inet.h>
39#include <linux/netdevice.h>
40#include <linux/icmpv6.h>
41#include <linux/netfilter_ipv6.h>
42
43#include <net/ip.h>
44#include <net/ipv6.h>
45#include <net/udp.h>
46#include <net/udplite.h>
47#include <net/tcp.h>
48#include <net/ping.h>
49#include <net/protocol.h>
50#include <net/inet_common.h>
51#include <net/route.h>
52#include <net/transp_v6.h>
53#include <net/ip6_route.h>
54#include <net/addrconf.h>
55#include <net/ipv6_stubs.h>
56#include <net/ndisc.h>
57#ifdef CONFIG_IPV6_TUNNEL
58#include <net/ip6_tunnel.h>
59#endif
60#include <net/calipso.h>
61#include <net/seg6.h>
62#include <net/rpl.h>
63#include <net/compat.h>
64#include <net/xfrm.h>
65#include <net/ioam6.h>
66#include <net/rawv6.h>
67
68#include <linux/uaccess.h>
69#include <linux/mroute6.h>
70
71#include "ip6_offload.h"
72
73MODULE_AUTHOR("Cast of dozens");
74MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
75MODULE_LICENSE("GPL");
76
77/* The inetsw6 table contains everything that inet6_create needs to
78 * build a new socket.
79 */
80static struct list_head inetsw6[SOCK_MAX];
81static DEFINE_SPINLOCK(inetsw6_lock);
82
83struct ipv6_params ipv6_defaults = {
84 .disable_ipv6 = 0,
85 .autoconf = 1,
86};
87
88static int disable_ipv6_mod;
89
90module_param_named(disable, disable_ipv6_mod, int, 0444);
91MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
92
93module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
94MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
95
96module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
97MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
98
99bool ipv6_mod_enabled(void)
100{
101 return disable_ipv6_mod == 0;
102}
103EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
104
105static struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
106{
107 const int offset = sk->sk_prot->ipv6_pinfo_offset;
108
109 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
110}
111
112void inet6_sock_destruct(struct sock *sk)
113{
114 inet6_cleanup_sock(sk);
115 inet_sock_destruct(sk);
116}
117EXPORT_SYMBOL_GPL(inet6_sock_destruct);
118
119static int inet6_create(struct net *net, struct socket *sock, int protocol,
120 int kern)
121{
122 struct inet_sock *inet;
123 struct ipv6_pinfo *np;
124 struct sock *sk;
125 struct inet_protosw *answer;
126 struct proto *answer_prot;
127 unsigned char answer_flags;
128 int try_loading_module = 0;
129 int err;
130
131 if (protocol < 0 || protocol >= IPPROTO_MAX)
132 return -EINVAL;
133
134 /* Look for the requested type/protocol pair. */
135lookup_protocol:
136 err = -ESOCKTNOSUPPORT;
137 rcu_read_lock();
138 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
139
140 err = 0;
141 /* Check the non-wild match. */
142 if (protocol == answer->protocol) {
143 if (protocol != IPPROTO_IP)
144 break;
145 } else {
146 /* Check for the two wild cases. */
147 if (IPPROTO_IP == protocol) {
148 protocol = answer->protocol;
149 break;
150 }
151 if (IPPROTO_IP == answer->protocol)
152 break;
153 }
154 err = -EPROTONOSUPPORT;
155 }
156
157 if (err) {
158 if (try_loading_module < 2) {
159 rcu_read_unlock();
160 /*
161 * Be more specific, e.g. net-pf-10-proto-132-type-1
162 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
163 */
164 if (++try_loading_module == 1)
165 request_module("net-pf-%d-proto-%d-type-%d",
166 PF_INET6, protocol, sock->type);
167 /*
168 * Fall back to generic, e.g. net-pf-10-proto-132
169 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
170 */
171 else
172 request_module("net-pf-%d-proto-%d",
173 PF_INET6, protocol);
174 goto lookup_protocol;
175 } else
176 goto out_rcu_unlock;
177 }
178
179 err = -EPERM;
180 if (sock->type == SOCK_RAW && !kern &&
181 !ns_capable(ns: net->user_ns, CAP_NET_RAW))
182 goto out_rcu_unlock;
183
184 sock->ops = answer->ops;
185 answer_prot = answer->prot;
186 answer_flags = answer->flags;
187 rcu_read_unlock();
188
189 WARN_ON(!answer_prot->slab);
190
191 err = -ENOBUFS;
192 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, prot: answer_prot, kern);
193 if (!sk)
194 goto out;
195
196 sock_init_data(sock, sk);
197
198 err = 0;
199 if (INET_PROTOSW_REUSE & answer_flags)
200 sk->sk_reuse = SK_CAN_REUSE;
201
202 inet = inet_sk(sk);
203 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
204
205 if (SOCK_RAW == sock->type) {
206 inet->inet_num = protocol;
207 if (IPPROTO_RAW == protocol)
208 inet_set_bit(HDRINCL, sk);
209 }
210
211 sk->sk_destruct = inet6_sock_destruct;
212 sk->sk_family = PF_INET6;
213 sk->sk_protocol = protocol;
214
215 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
216
217 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
218 np->hop_limit = -1;
219 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
220 inet6_set_bit(MC6_LOOP, sk);
221 inet6_set_bit(MC6_ALL, sk);
222 np->pmtudisc = IPV6_PMTUDISC_WANT;
223 inet6_assign_bit(REPFLOW, sk, net->ipv6.sysctl.flowlabel_reflect &
224 FLOWLABEL_REFLECT_ESTABLISHED);
225 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
226 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
227
228 /* Init the ipv4 part of the socket since we can have sockets
229 * using v6 API for ipv4.
230 */
231 inet->uc_ttl = -1;
232
233 inet_set_bit(MC_LOOP, sk);
234 inet->mc_ttl = 1;
235 inet->mc_index = 0;
236 RCU_INIT_POINTER(inet->mc_list, NULL);
237 inet->rcv_tos = 0;
238
239 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
240 inet->pmtudisc = IP_PMTUDISC_DONT;
241 else
242 inet->pmtudisc = IP_PMTUDISC_WANT;
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 }
271out:
272 return err;
273out_rcu_unlock:
274 rcu_read_unlock();
275 goto out;
276}
277
278static 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: 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: &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, port: snum) &&
301 !ns_capable(ns: 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 (ipv6_only_sock(sk)) {
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, ifindex: 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, addr: v4addr);
338 rcu_read_unlock();
339
340 if (!inet_addr_valid_or_nonlocal(net, inet, addr: v4addr,
341 addr_type: chk_addr_ret)) {
342 err = -EADDRNOTAVAIL;
343 goto out;
344 }
345 } else {
346 if (addr_type != IPV6_ADDR_ANY) {
347 struct net_device *dev = NULL;
348
349 rcu_read_lock();
350 if (__ipv6_addr_needs_scope_id(type: addr_type)) {
351 if (addr_len >= sizeof(struct sockaddr_in6) &&
352 addr->sin6_scope_id) {
353 /* Override any existing binding, if another one
354 * is supplied by user.
355 */
356 sk->sk_bound_dev_if = addr->sin6_scope_id;
357 }
358
359 /* Binding to link-local address requires an interface */
360 if (!sk->sk_bound_dev_if) {
361 err = -EINVAL;
362 goto out_unlock;
363 }
364 }
365
366 if (sk->sk_bound_dev_if) {
367 dev = dev_get_by_index_rcu(net, ifindex: sk->sk_bound_dev_if);
368 if (!dev) {
369 err = -ENODEV;
370 goto out_unlock;
371 }
372 }
373
374 /* ipv4 addr of the socket is invalid. Only the
375 * unspecified and mapped address have a v4 equivalent.
376 */
377 v4addr = LOOPBACK4_IPV6;
378 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
379 if (!ipv6_can_nonlocal_bind(net, inet) &&
380 !ipv6_chk_addr(net, addr: &addr->sin6_addr,
381 dev, strict: 0)) {
382 err = -EADDRNOTAVAIL;
383 goto out_unlock;
384 }
385 }
386 rcu_read_unlock();
387 }
388 }
389
390 inet->inet_rcv_saddr = v4addr;
391 inet->inet_saddr = v4addr;
392
393 sk->sk_v6_rcv_saddr = addr->sin6_addr;
394
395 if (!(addr_type & IPV6_ADDR_MULTICAST))
396 np->saddr = addr->sin6_addr;
397
398 saved_ipv6only = sk->sk_ipv6only;
399 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
400 sk->sk_ipv6only = 1;
401
402 /* Make sure we are allowed to bind here. */
403 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
404 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
405 err = sk->sk_prot->get_port(sk, snum);
406 if (err) {
407 sk->sk_ipv6only = saved_ipv6only;
408 inet_reset_saddr(sk);
409 goto out;
410 }
411 if (!(flags & BIND_FROM_BPF)) {
412 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
413 if (err) {
414 sk->sk_ipv6only = saved_ipv6only;
415 inet_reset_saddr(sk);
416 if (sk->sk_prot->put_port)
417 sk->sk_prot->put_port(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
439int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
440{
441 u32 flags = BIND_WITH_LOCK;
442 const struct proto *prot;
443 int err = 0;
444
445 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
446 prot = READ_ONCE(sk->sk_prot);
447 /* If the socket has its own bind function then use it. */
448 if (prot->bind)
449 return 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, &addr_len,
458 CGROUP_INET6_BIND, &flags);
459 if (err)
460 return err;
461
462 return __inet6_bind(sk, uaddr, addr_len, flags);
463}
464
465/* bind for INET6 API */
466int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
467{
468 return inet6_bind_sk(sk: sock->sk, uaddr, addr_len);
469}
470EXPORT_SYMBOL(inet6_bind);
471
472int inet6_release(struct socket *sock)
473{
474 struct sock *sk = sock->sk;
475
476 if (!sk)
477 return -EINVAL;
478
479 /* Free mc lists */
480 ipv6_sock_mc_close(sk);
481
482 /* Free ac lists */
483 ipv6_sock_ac_close(sk);
484
485 return inet_release(sock);
486}
487EXPORT_SYMBOL(inet6_release);
488
489void inet6_cleanup_sock(struct sock *sk)
490{
491 struct ipv6_pinfo *np = inet6_sk(sk: sk);
492 struct sk_buff *skb;
493 struct ipv6_txoptions *opt;
494
495 /* Release rx options */
496
497 skb = xchg(&np->pktoptions, NULL);
498 kfree_skb(skb);
499
500 skb = xchg(&np->rxpmtu, NULL);
501 kfree_skb(skb);
502
503 /* Free flowlabels */
504 fl6_free_socklist(sk);
505
506 /* Free tx options */
507
508 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
509 if (opt) {
510 atomic_sub(i: opt->tot_len, v: &sk->sk_omem_alloc);
511 txopt_put(opt);
512 }
513}
514EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
515
516/*
517 * This does both peername and sockname.
518 */
519int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
520 int peer)
521{
522 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
523 int sin_addr_len = sizeof(*sin);
524 struct sock *sk = sock->sk;
525 struct inet_sock *inet = inet_sk(sk);
526 struct ipv6_pinfo *np = inet6_sk(sk: sk);
527
528 sin->sin6_family = AF_INET6;
529 sin->sin6_flowinfo = 0;
530 sin->sin6_scope_id = 0;
531 lock_sock(sk);
532 if (peer) {
533 if (!inet->inet_dport ||
534 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
535 peer == 1)) {
536 release_sock(sk);
537 return -ENOTCONN;
538 }
539 sin->sin6_port = inet->inet_dport;
540 sin->sin6_addr = sk->sk_v6_daddr;
541 if (inet6_test_bit(SNDFLOW, sk))
542 sin->sin6_flowinfo = np->flow_label;
543 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
544 CGROUP_INET6_GETPEERNAME);
545 } else {
546 if (ipv6_addr_any(a: &sk->sk_v6_rcv_saddr))
547 sin->sin6_addr = np->saddr;
548 else
549 sin->sin6_addr = sk->sk_v6_rcv_saddr;
550 sin->sin6_port = inet->inet_sport;
551 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
552 CGROUP_INET6_GETSOCKNAME);
553 }
554 sin->sin6_scope_id = ipv6_iface_scope_id(addr: &sin->sin6_addr,
555 iface: sk->sk_bound_dev_if);
556 release_sock(sk);
557 return sin_addr_len;
558}
559EXPORT_SYMBOL(inet6_getname);
560
561int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
562{
563 void __user *argp = (void __user *)arg;
564 struct sock *sk = sock->sk;
565 struct net *net = sock_net(sk);
566 const struct proto *prot;
567
568 switch (cmd) {
569 case SIOCADDRT:
570 case SIOCDELRT: {
571 struct in6_rtmsg rtmsg;
572
573 if (copy_from_user(to: &rtmsg, from: argp, n: sizeof(rtmsg)))
574 return -EFAULT;
575 return ipv6_route_ioctl(net, cmd, rtmsg: &rtmsg);
576 }
577 case SIOCSIFADDR:
578 return addrconf_add_ifaddr(net, arg: argp);
579 case SIOCDIFADDR:
580 return addrconf_del_ifaddr(net, arg: argp);
581 case SIOCSIFDSTADDR:
582 return addrconf_set_dstaddr(net, arg: argp);
583 default:
584 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
585 prot = READ_ONCE(sk->sk_prot);
586 if (!prot->ioctl)
587 return -ENOIOCTLCMD;
588 return sk_ioctl(sk, cmd, arg: (void __user *)arg);
589 }
590 /*NOTREACHED*/
591 return 0;
592}
593EXPORT_SYMBOL(inet6_ioctl);
594
595#ifdef CONFIG_COMPAT
596struct compat_in6_rtmsg {
597 struct in6_addr rtmsg_dst;
598 struct in6_addr rtmsg_src;
599 struct in6_addr rtmsg_gateway;
600 u32 rtmsg_type;
601 u16 rtmsg_dst_len;
602 u16 rtmsg_src_len;
603 u32 rtmsg_metric;
604 u32 rtmsg_info;
605 u32 rtmsg_flags;
606 s32 rtmsg_ifindex;
607};
608
609static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
610 struct compat_in6_rtmsg __user *ur)
611{
612 struct in6_rtmsg rt;
613
614 if (copy_from_user(to: &rt.rtmsg_dst, from: &ur->rtmsg_dst,
615 n: 3 * sizeof(struct in6_addr)) ||
616 get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
617 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
618 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
619 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
620 get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
621 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
622 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
623 return -EFAULT;
624
625
626 return ipv6_route_ioctl(net: sock_net(sk), cmd, rtmsg: &rt);
627}
628
629int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
630{
631 void __user *argp = compat_ptr(uptr: arg);
632 struct sock *sk = sock->sk;
633
634 switch (cmd) {
635 case SIOCADDRT:
636 case SIOCDELRT:
637 return inet6_compat_routing_ioctl(sk, cmd, ur: argp);
638 default:
639 return -ENOIOCTLCMD;
640 }
641}
642EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
643#endif /* CONFIG_COMPAT */
644
645INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
646 size_t));
647int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
648{
649 struct sock *sk = sock->sk;
650 const struct proto *prot;
651
652 if (unlikely(inet_send_prepare(sk)))
653 return -EAGAIN;
654
655 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
656 prot = READ_ONCE(sk->sk_prot);
657 return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
658 sk, msg, size);
659}
660
661INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
662 size_t, int, int *));
663int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
664 int flags)
665{
666 struct sock *sk = sock->sk;
667 const struct proto *prot;
668 int addr_len = 0;
669 int err;
670
671 if (likely(!(flags & MSG_ERRQUEUE)))
672 sock_rps_record_flow(sk);
673
674 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
675 prot = READ_ONCE(sk->sk_prot);
676 err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
677 sk, msg, size, flags, &addr_len);
678 if (err >= 0)
679 msg->msg_namelen = addr_len;
680 return err;
681}
682
683const struct proto_ops inet6_stream_ops = {
684 .family = PF_INET6,
685 .owner = THIS_MODULE,
686 .release = inet6_release,
687 .bind = inet6_bind,
688 .connect = inet_stream_connect, /* ok */
689 .socketpair = sock_no_socketpair, /* a do nothing */
690 .accept = inet_accept, /* ok */
691 .getname = inet6_getname,
692 .poll = tcp_poll, /* ok */
693 .ioctl = inet6_ioctl, /* must change */
694 .gettstamp = sock_gettstamp,
695 .listen = inet_listen, /* ok */
696 .shutdown = inet_shutdown, /* ok */
697 .setsockopt = sock_common_setsockopt, /* ok */
698 .getsockopt = sock_common_getsockopt, /* ok */
699 .sendmsg = inet6_sendmsg, /* retpoline's sake */
700 .recvmsg = inet6_recvmsg, /* retpoline's sake */
701#ifdef CONFIG_MMU
702 .mmap = tcp_mmap,
703#endif
704 .splice_eof = inet_splice_eof,
705 .sendmsg_locked = tcp_sendmsg_locked,
706 .splice_read = tcp_splice_read,
707 .read_sock = tcp_read_sock,
708 .read_skb = tcp_read_skb,
709 .peek_len = tcp_peek_len,
710#ifdef CONFIG_COMPAT
711 .compat_ioctl = inet6_compat_ioctl,
712#endif
713 .set_rcvlowat = tcp_set_rcvlowat,
714};
715
716const struct proto_ops inet6_dgram_ops = {
717 .family = PF_INET6,
718 .owner = THIS_MODULE,
719 .release = inet6_release,
720 .bind = inet6_bind,
721 .connect = inet_dgram_connect, /* ok */
722 .socketpair = sock_no_socketpair, /* a do nothing */
723 .accept = sock_no_accept, /* a do nothing */
724 .getname = inet6_getname,
725 .poll = udp_poll, /* ok */
726 .ioctl = inet6_ioctl, /* must change */
727 .gettstamp = sock_gettstamp,
728 .listen = sock_no_listen, /* ok */
729 .shutdown = inet_shutdown, /* ok */
730 .setsockopt = sock_common_setsockopt, /* ok */
731 .getsockopt = sock_common_getsockopt, /* ok */
732 .sendmsg = inet6_sendmsg, /* retpoline's sake */
733 .recvmsg = inet6_recvmsg, /* retpoline's sake */
734 .read_skb = udp_read_skb,
735 .mmap = sock_no_mmap,
736 .set_peek_off = sk_set_peek_off,
737#ifdef CONFIG_COMPAT
738 .compat_ioctl = inet6_compat_ioctl,
739#endif
740};
741
742static const struct net_proto_family inet6_family_ops = {
743 .family = PF_INET6,
744 .create = inet6_create,
745 .owner = THIS_MODULE,
746};
747
748int inet6_register_protosw(struct inet_protosw *p)
749{
750 struct list_head *lh;
751 struct inet_protosw *answer;
752 struct list_head *last_perm;
753 int protocol = p->protocol;
754 int ret;
755
756 spin_lock_bh(lock: &inetsw6_lock);
757
758 ret = -EINVAL;
759 if (p->type >= SOCK_MAX)
760 goto out_illegal;
761
762 /* If we are trying to override a permanent protocol, bail. */
763 answer = NULL;
764 ret = -EPERM;
765 last_perm = &inetsw6[p->type];
766 list_for_each(lh, &inetsw6[p->type]) {
767 answer = list_entry(lh, struct inet_protosw, list);
768
769 /* Check only the non-wild match. */
770 if (INET_PROTOSW_PERMANENT & answer->flags) {
771 if (protocol == answer->protocol)
772 break;
773 last_perm = lh;
774 }
775
776 answer = NULL;
777 }
778 if (answer)
779 goto out_permanent;
780
781 /* Add the new entry after the last permanent entry if any, so that
782 * the new entry does not override a permanent entry when matched with
783 * a wild-card protocol. But it is allowed to override any existing
784 * non-permanent entry. This means that when we remove this entry, the
785 * system automatically returns to the old behavior.
786 */
787 list_add_rcu(new: &p->list, head: last_perm);
788 ret = 0;
789out:
790 spin_unlock_bh(lock: &inetsw6_lock);
791 return ret;
792
793out_permanent:
794 pr_err("Attempt to override permanent protocol %d\n", protocol);
795 goto out;
796
797out_illegal:
798 pr_err("Ignoring attempt to register invalid socket type %d\n",
799 p->type);
800 goto out;
801}
802EXPORT_SYMBOL(inet6_register_protosw);
803
804void
805inet6_unregister_protosw(struct inet_protosw *p)
806{
807 if (INET_PROTOSW_PERMANENT & p->flags) {
808 pr_err("Attempt to unregister permanent protocol %d\n",
809 p->protocol);
810 } else {
811 spin_lock_bh(lock: &inetsw6_lock);
812 list_del_rcu(entry: &p->list);
813 spin_unlock_bh(lock: &inetsw6_lock);
814
815 synchronize_net();
816 }
817}
818EXPORT_SYMBOL(inet6_unregister_protosw);
819
820int inet6_sk_rebuild_header(struct sock *sk)
821{
822 struct ipv6_pinfo *np = inet6_sk(sk: sk);
823 struct dst_entry *dst;
824
825 dst = __sk_dst_check(sk, cookie: np->dst_cookie);
826
827 if (!dst) {
828 struct inet_sock *inet = inet_sk(sk);
829 struct in6_addr *final_p, final;
830 struct flowi6 fl6;
831
832 memset(&fl6, 0, sizeof(fl6));
833 fl6.flowi6_proto = sk->sk_protocol;
834 fl6.daddr = sk->sk_v6_daddr;
835 fl6.saddr = np->saddr;
836 fl6.flowlabel = np->flow_label;
837 fl6.flowi6_oif = sk->sk_bound_dev_if;
838 fl6.flowi6_mark = sk->sk_mark;
839 fl6.fl6_dport = inet->inet_dport;
840 fl6.fl6_sport = inet->inet_sport;
841 fl6.flowi6_uid = sk->sk_uid;
842 security_sk_classify_flow(sk, flic: flowi6_to_flowi_common(fl6: &fl6));
843
844 rcu_read_lock();
845 final_p = fl6_update_dst(fl6: &fl6, rcu_dereference(np->opt),
846 orig: &final);
847 rcu_read_unlock();
848
849 dst = ip6_dst_lookup_flow(net: sock_net(sk), sk, fl6: &fl6, final_dst: final_p);
850 if (IS_ERR(ptr: dst)) {
851 sk->sk_route_caps = 0;
852 WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
853 return PTR_ERR(ptr: dst);
854 }
855
856 ip6_dst_store(sk, dst, NULL, NULL);
857 }
858
859 return 0;
860}
861EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
862
863bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
864 const struct inet6_skb_parm *opt)
865{
866 const struct ipv6_pinfo *np = inet6_sk(sk: sk);
867
868 if (np->rxopt.all) {
869 if (((opt->flags & IP6SKB_HOPBYHOP) &&
870 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
871 (ip6_flowinfo(hdr: (struct ipv6hdr *) skb_network_header(skb)) &&
872 np->rxopt.bits.rxflow) ||
873 (opt->srcrt && (np->rxopt.bits.srcrt ||
874 np->rxopt.bits.osrcrt)) ||
875 ((opt->dst1 || opt->dst0) &&
876 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
877 return true;
878 }
879 return false;
880}
881EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
882
883static struct packet_type ipv6_packet_type __read_mostly = {
884 .type = cpu_to_be16(ETH_P_IPV6),
885 .func = ipv6_rcv,
886 .list_func = ipv6_list_rcv,
887};
888
889static int __init ipv6_packet_init(void)
890{
891 dev_add_pack(pt: &ipv6_packet_type);
892 return 0;
893}
894
895static void ipv6_packet_cleanup(void)
896{
897 dev_remove_pack(pt: &ipv6_packet_type);
898}
899
900static int __net_init ipv6_init_mibs(struct net *net)
901{
902 int i;
903
904 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
905 if (!net->mib.udp_stats_in6)
906 return -ENOMEM;
907 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
908 if (!net->mib.udplite_stats_in6)
909 goto err_udplite_mib;
910 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
911 if (!net->mib.ipv6_statistics)
912 goto err_ip_mib;
913
914 for_each_possible_cpu(i) {
915 struct ipstats_mib *af_inet6_stats;
916 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
917 u64_stats_init(syncp: &af_inet6_stats->syncp);
918 }
919
920
921 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
922 if (!net->mib.icmpv6_statistics)
923 goto err_icmp_mib;
924 net->mib.icmpv6msg_statistics = kzalloc(size: sizeof(struct icmpv6msg_mib),
925 GFP_KERNEL);
926 if (!net->mib.icmpv6msg_statistics)
927 goto err_icmpmsg_mib;
928 return 0;
929
930err_icmpmsg_mib:
931 free_percpu(pdata: net->mib.icmpv6_statistics);
932err_icmp_mib:
933 free_percpu(pdata: net->mib.ipv6_statistics);
934err_ip_mib:
935 free_percpu(pdata: net->mib.udplite_stats_in6);
936err_udplite_mib:
937 free_percpu(pdata: net->mib.udp_stats_in6);
938 return -ENOMEM;
939}
940
941static void ipv6_cleanup_mibs(struct net *net)
942{
943 free_percpu(pdata: net->mib.udp_stats_in6);
944 free_percpu(pdata: net->mib.udplite_stats_in6);
945 free_percpu(pdata: net->mib.ipv6_statistics);
946 free_percpu(pdata: net->mib.icmpv6_statistics);
947 kfree(objp: net->mib.icmpv6msg_statistics);
948}
949
950static int __net_init inet6_net_init(struct net *net)
951{
952 int err = 0;
953
954 net->ipv6.sysctl.bindv6only = 0;
955 net->ipv6.sysctl.icmpv6_time = 1*HZ;
956 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
957 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
958 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
959 net->ipv6.sysctl.icmpv6_error_anycast_as_unicast = 0;
960
961 /* By default, rate limit error messages.
962 * Except for pmtu discovery, it would break it.
963 * proc_do_large_bitmap needs pointer to the bitmap.
964 */
965 bitmap_set(map: net->ipv6.sysctl.icmpv6_ratemask, start: 0, ICMPV6_ERRMSG_MAX + 1);
966 bitmap_clear(map: net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, nbits: 1);
967 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
968
969 net->ipv6.sysctl.flowlabel_consistency = 1;
970 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
971 net->ipv6.sysctl.idgen_retries = 3;
972 net->ipv6.sysctl.idgen_delay = 1 * HZ;
973 net->ipv6.sysctl.flowlabel_state_ranges = 0;
974 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
975 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
976 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
977 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
978 net->ipv6.sysctl.fib_notify_on_flag_change = 0;
979 atomic_set(v: &net->ipv6.fib6_sernum, i: 1);
980
981 net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
982 net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
983
984 err = ipv6_init_mibs(net);
985 if (err)
986 return err;
987#ifdef CONFIG_PROC_FS
988 err = udp6_proc_init(net);
989 if (err)
990 goto out;
991 err = tcp6_proc_init(net);
992 if (err)
993 goto proc_tcp6_fail;
994 err = ac6_proc_init(net);
995 if (err)
996 goto proc_ac6_fail;
997#endif
998 return err;
999
1000#ifdef CONFIG_PROC_FS
1001proc_ac6_fail:
1002 tcp6_proc_exit(net);
1003proc_tcp6_fail:
1004 udp6_proc_exit(net);
1005out:
1006 ipv6_cleanup_mibs(net);
1007 return err;
1008#endif
1009}
1010
1011static void __net_exit inet6_net_exit(struct net *net)
1012{
1013#ifdef CONFIG_PROC_FS
1014 udp6_proc_exit(net);
1015 tcp6_proc_exit(net);
1016 ac6_proc_exit(net);
1017#endif
1018 ipv6_cleanup_mibs(net);
1019}
1020
1021static struct pernet_operations inet6_net_ops = {
1022 .init = inet6_net_init,
1023 .exit = inet6_net_exit,
1024};
1025
1026static int ipv6_route_input(struct sk_buff *skb)
1027{
1028 ip6_route_input(skb);
1029 return skb_dst(skb)->error;
1030}
1031
1032static const struct ipv6_stub ipv6_stub_impl = {
1033 .ipv6_sock_mc_join = ipv6_sock_mc_join,
1034 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1035 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1036 .ipv6_route_input = ipv6_route_input,
1037 .fib6_get_table = fib6_get_table,
1038 .fib6_table_lookup = fib6_table_lookup,
1039 .fib6_lookup = fib6_lookup,
1040 .fib6_select_path = fib6_select_path,
1041 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1042 .fib6_nh_init = fib6_nh_init,
1043 .fib6_nh_release = fib6_nh_release,
1044 .fib6_nh_release_dsts = fib6_nh_release_dsts,
1045 .fib6_update_sernum = fib6_update_sernum_stub,
1046 .fib6_rt_update = fib6_rt_update,
1047 .ip6_del_rt = ip6_del_rt,
1048 .udpv6_encap_enable = udpv6_encap_enable,
1049 .ndisc_send_na = ndisc_send_na,
1050#if IS_ENABLED(CONFIG_XFRM)
1051 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1052 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1053 .xfrm6_gro_udp_encap_rcv = xfrm6_gro_udp_encap_rcv,
1054 .xfrm6_rcv_encap = xfrm6_rcv_encap,
1055#endif
1056 .nd_tbl = &nd_tbl,
1057 .ipv6_fragment = ip6_fragment,
1058 .ipv6_dev_find = ipv6_dev_find,
1059};
1060
1061static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1062 .inet6_bind = __inet6_bind,
1063 .udp6_lib_lookup = __udp6_lib_lookup,
1064 .ipv6_setsockopt = do_ipv6_setsockopt,
1065 .ipv6_getsockopt = do_ipv6_getsockopt,
1066 .ipv6_dev_get_saddr = ipv6_dev_get_saddr,
1067};
1068
1069static int __init inet6_init(void)
1070{
1071 struct list_head *r;
1072 int err = 0;
1073
1074 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1075
1076 /* Register the socket-side information for inet6_create. */
1077 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1078 INIT_LIST_HEAD(list: r);
1079
1080 raw_hashinfo_init(hashinfo: &raw_v6_hashinfo);
1081
1082 if (disable_ipv6_mod) {
1083 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1084 goto out;
1085 }
1086
1087 err = proto_register(prot: &tcpv6_prot, alloc_slab: 1);
1088 if (err)
1089 goto out;
1090
1091 err = proto_register(prot: &udpv6_prot, alloc_slab: 1);
1092 if (err)
1093 goto out_unregister_tcp_proto;
1094
1095 err = proto_register(prot: &udplitev6_prot, alloc_slab: 1);
1096 if (err)
1097 goto out_unregister_udp_proto;
1098
1099 err = proto_register(prot: &rawv6_prot, alloc_slab: 1);
1100 if (err)
1101 goto out_unregister_udplite_proto;
1102
1103 err = proto_register(prot: &pingv6_prot, alloc_slab: 1);
1104 if (err)
1105 goto out_unregister_raw_proto;
1106
1107 /* We MUST register RAW sockets before we create the ICMP6,
1108 * IGMP6, or NDISC control sockets.
1109 */
1110 err = rawv6_init();
1111 if (err)
1112 goto out_unregister_ping_proto;
1113
1114 /* Register the family here so that the init calls below will
1115 * be able to create sockets. (?? is this dangerous ??)
1116 */
1117 err = sock_register(fam: &inet6_family_ops);
1118 if (err)
1119 goto out_sock_register_fail;
1120
1121 /*
1122 * ipngwg API draft makes clear that the correct semantics
1123 * for TCP and UDP is to consider one TCP and UDP instance
1124 * in a host available by both INET and INET6 APIs and
1125 * able to communicate via both network protocols.
1126 */
1127
1128 err = register_pernet_subsys(&inet6_net_ops);
1129 if (err)
1130 goto register_pernet_fail;
1131 err = ip6_mr_init();
1132 if (err)
1133 goto ipmr_fail;
1134 err = icmpv6_init();
1135 if (err)
1136 goto icmp_fail;
1137 err = ndisc_init();
1138 if (err)
1139 goto ndisc_fail;
1140 err = igmp6_init();
1141 if (err)
1142 goto igmp_fail;
1143
1144 err = ipv6_netfilter_init();
1145 if (err)
1146 goto netfilter_fail;
1147 /* Create /proc/foo6 entries. */
1148#ifdef CONFIG_PROC_FS
1149 err = -ENOMEM;
1150 if (raw6_proc_init())
1151 goto proc_raw6_fail;
1152 if (udplite6_proc_init())
1153 goto proc_udplite6_fail;
1154 if (ipv6_misc_proc_init())
1155 goto proc_misc6_fail;
1156 if (if6_proc_init())
1157 goto proc_if6_fail;
1158#endif
1159 err = ip6_route_init();
1160 if (err)
1161 goto ip6_route_fail;
1162 err = ndisc_late_init();
1163 if (err)
1164 goto ndisc_late_fail;
1165 err = ip6_flowlabel_init();
1166 if (err)
1167 goto ip6_flowlabel_fail;
1168 err = ipv6_anycast_init();
1169 if (err)
1170 goto ipv6_anycast_fail;
1171 err = addrconf_init();
1172 if (err)
1173 goto addrconf_fail;
1174
1175 /* Init v6 extension headers. */
1176 err = ipv6_exthdrs_init();
1177 if (err)
1178 goto ipv6_exthdrs_fail;
1179
1180 err = ipv6_frag_init();
1181 if (err)
1182 goto ipv6_frag_fail;
1183
1184 /* Init v6 transport protocols. */
1185 err = udpv6_init();
1186 if (err)
1187 goto udpv6_fail;
1188
1189 err = udplitev6_init();
1190 if (err)
1191 goto udplitev6_fail;
1192
1193 err = udpv6_offload_init();
1194 if (err)
1195 goto udpv6_offload_fail;
1196
1197 err = tcpv6_init();
1198 if (err)
1199 goto tcpv6_fail;
1200
1201 err = ipv6_packet_init();
1202 if (err)
1203 goto ipv6_packet_fail;
1204
1205 err = pingv6_init();
1206 if (err)
1207 goto pingv6_fail;
1208
1209 err = calipso_init();
1210 if (err)
1211 goto calipso_fail;
1212
1213 err = seg6_init();
1214 if (err)
1215 goto seg6_fail;
1216
1217 err = rpl_init();
1218 if (err)
1219 goto rpl_fail;
1220
1221 err = ioam6_init();
1222 if (err)
1223 goto ioam6_fail;
1224
1225 err = igmp6_late_init();
1226 if (err)
1227 goto igmp6_late_err;
1228
1229#ifdef CONFIG_SYSCTL
1230 err = ipv6_sysctl_register();
1231 if (err)
1232 goto sysctl_fail;
1233#endif
1234
1235 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1236 wmb();
1237 ipv6_stub = &ipv6_stub_impl;
1238 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1239out:
1240 return err;
1241
1242#ifdef CONFIG_SYSCTL
1243sysctl_fail:
1244 igmp6_late_cleanup();
1245#endif
1246igmp6_late_err:
1247 ioam6_exit();
1248ioam6_fail:
1249 rpl_exit();
1250rpl_fail:
1251 seg6_exit();
1252seg6_fail:
1253 calipso_exit();
1254calipso_fail:
1255 pingv6_exit();
1256pingv6_fail:
1257 ipv6_packet_cleanup();
1258ipv6_packet_fail:
1259 tcpv6_exit();
1260tcpv6_fail:
1261 udpv6_offload_exit();
1262udpv6_offload_fail:
1263 udplitev6_exit();
1264udplitev6_fail:
1265 udpv6_exit();
1266udpv6_fail:
1267 ipv6_frag_exit();
1268ipv6_frag_fail:
1269 ipv6_exthdrs_exit();
1270ipv6_exthdrs_fail:
1271 addrconf_cleanup();
1272addrconf_fail:
1273 ipv6_anycast_cleanup();
1274ipv6_anycast_fail:
1275 ip6_flowlabel_cleanup();
1276ip6_flowlabel_fail:
1277 ndisc_late_cleanup();
1278ndisc_late_fail:
1279 ip6_route_cleanup();
1280ip6_route_fail:
1281#ifdef CONFIG_PROC_FS
1282 if6_proc_exit();
1283proc_if6_fail:
1284 ipv6_misc_proc_exit();
1285proc_misc6_fail:
1286 udplite6_proc_exit();
1287proc_udplite6_fail:
1288 raw6_proc_exit();
1289proc_raw6_fail:
1290#endif
1291 ipv6_netfilter_fini();
1292netfilter_fail:
1293 igmp6_cleanup();
1294igmp_fail:
1295 ndisc_cleanup();
1296ndisc_fail:
1297 icmpv6_cleanup();
1298icmp_fail:
1299 ip6_mr_cleanup();
1300ipmr_fail:
1301 unregister_pernet_subsys(&inet6_net_ops);
1302register_pernet_fail:
1303 sock_unregister(PF_INET6);
1304 rtnl_unregister_all(PF_INET6);
1305out_sock_register_fail:
1306 rawv6_exit();
1307out_unregister_ping_proto:
1308 proto_unregister(prot: &pingv6_prot);
1309out_unregister_raw_proto:
1310 proto_unregister(prot: &rawv6_prot);
1311out_unregister_udplite_proto:
1312 proto_unregister(prot: &udplitev6_prot);
1313out_unregister_udp_proto:
1314 proto_unregister(prot: &udpv6_prot);
1315out_unregister_tcp_proto:
1316 proto_unregister(prot: &tcpv6_prot);
1317 goto out;
1318}
1319module_init(inet6_init);
1320
1321MODULE_ALIAS_NETPROTO(PF_INET6);
1322

source code of linux/net/ipv6/af_inet6.c