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 inet = inet_sk(sk);
201 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
202
203 if (SOCK_RAW == sock->type) {
204 inet->inet_num = protocol;
205 if (IPPROTO_RAW == protocol)
206 inet->hdrincl = 1;
207 }
208
209 sk->sk_destruct = inet6_sock_destruct;
210 sk->sk_family = PF_INET6;
211 sk->sk_protocol = protocol;
212
213 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
214
215 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
216 np->hop_limit = -1;
217 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
218 np->mc_loop = 1;
219 np->mc_all = 1;
220 np->pmtudisc = IPV6_PMTUDISC_WANT;
221 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
222 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
223
224 /* Init the ipv4 part of the socket since we can have sockets
225 * using v6 API for ipv4.
226 */
227 inet->uc_ttl = -1;
228
229 inet->mc_loop = 1;
230 inet->mc_ttl = 1;
231 inet->mc_index = 0;
232 inet->mc_list = NULL;
233 inet->rcv_tos = 0;
234
235 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
236 inet->pmtudisc = IP_PMTUDISC_DONT;
237 else
238 inet->pmtudisc = IP_PMTUDISC_WANT;
239 /*
240 * Increment only the relevant sk_prot->socks debug field, this changes
241 * the previous behaviour of incrementing both the equivalent to
242 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
243 *
244 * This allows better debug granularity as we'll know exactly how many
245 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
246 * transport protocol socks. -acme
247 */
248 sk_refcnt_debug_inc(sk);
249
250 if (inet->inet_num) {
251 /* It assumes that any protocol which allows
252 * the user to assign a number at socket
253 * creation time automatically shares.
254 */
255 inet->inet_sport = htons(inet->inet_num);
256 err = sk->sk_prot->hash(sk);
257 if (err) {
258 sk_common_release(sk);
259 goto out;
260 }
261 }
262 if (sk->sk_prot->init) {
263 err = sk->sk_prot->init(sk);
264 if (err) {
265 sk_common_release(sk);
266 goto out;
267 }
268 }
269
270 if (!kern) {
271 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
272 if (err) {
273 sk_common_release(sk);
274 goto out;
275 }
276 }
277 out:
278 return err;
279 out_rcu_unlock:
280 rcu_read_unlock();
281 goto out;
282 }
283
__inet6_bind(struct sock * sk,struct sockaddr * uaddr,int addr_len,u32 flags)284 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
285 u32 flags)
286 {
287 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
288 struct inet_sock *inet = inet_sk(sk);
289 struct ipv6_pinfo *np = inet6_sk(sk);
290 struct net *net = sock_net(sk);
291 __be32 v4addr = 0;
292 unsigned short snum;
293 bool saved_ipv6only;
294 int addr_type = 0;
295 int err = 0;
296
297 if (addr->sin6_family != AF_INET6)
298 return -EAFNOSUPPORT;
299
300 addr_type = ipv6_addr_type(&addr->sin6_addr);
301 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
302 return -EINVAL;
303
304 snum = ntohs(addr->sin6_port);
305 if (snum && inet_port_requires_bind_service(net, snum) &&
306 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
307 return -EACCES;
308
309 if (flags & BIND_WITH_LOCK)
310 lock_sock(sk);
311
312 /* Check these errors (active socket, double bind). */
313 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
314 err = -EINVAL;
315 goto out;
316 }
317
318 /* Check if the address belongs to the host. */
319 if (addr_type == IPV6_ADDR_MAPPED) {
320 struct net_device *dev = NULL;
321 int chk_addr_ret;
322
323 /* Binding to v4-mapped address on a v6-only socket
324 * makes no sense
325 */
326 if (sk->sk_ipv6only) {
327 err = -EINVAL;
328 goto out;
329 }
330
331 rcu_read_lock();
332 if (sk->sk_bound_dev_if) {
333 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
334 if (!dev) {
335 err = -ENODEV;
336 goto out_unlock;
337 }
338 }
339
340 /* Reproduce AF_INET checks to make the bindings consistent */
341 v4addr = addr->sin6_addr.s6_addr32[3];
342 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
343 rcu_read_unlock();
344
345 if (!inet_can_nonlocal_bind(net, inet) &&
346 v4addr != htonl(INADDR_ANY) &&
347 chk_addr_ret != RTN_LOCAL &&
348 chk_addr_ret != RTN_MULTICAST &&
349 chk_addr_ret != RTN_BROADCAST) {
350 err = -EADDRNOTAVAIL;
351 goto out;
352 }
353 } else {
354 if (addr_type != IPV6_ADDR_ANY) {
355 struct net_device *dev = NULL;
356
357 rcu_read_lock();
358 if (__ipv6_addr_needs_scope_id(addr_type)) {
359 if (addr_len >= sizeof(struct sockaddr_in6) &&
360 addr->sin6_scope_id) {
361 /* Override any existing binding, if another one
362 * is supplied by user.
363 */
364 sk->sk_bound_dev_if = addr->sin6_scope_id;
365 }
366
367 /* Binding to link-local address requires an interface */
368 if (!sk->sk_bound_dev_if) {
369 err = -EINVAL;
370 goto out_unlock;
371 }
372 }
373
374 if (sk->sk_bound_dev_if) {
375 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
376 if (!dev) {
377 err = -ENODEV;
378 goto out_unlock;
379 }
380 }
381
382 /* ipv4 addr of the socket is invalid. Only the
383 * unspecified and mapped address have a v4 equivalent.
384 */
385 v4addr = LOOPBACK4_IPV6;
386 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
387 if (!ipv6_can_nonlocal_bind(net, inet) &&
388 !ipv6_chk_addr(net, &addr->sin6_addr,
389 dev, 0)) {
390 err = -EADDRNOTAVAIL;
391 goto out_unlock;
392 }
393 }
394 rcu_read_unlock();
395 }
396 }
397
398 inet->inet_rcv_saddr = v4addr;
399 inet->inet_saddr = v4addr;
400
401 sk->sk_v6_rcv_saddr = addr->sin6_addr;
402
403 if (!(addr_type & IPV6_ADDR_MULTICAST))
404 np->saddr = addr->sin6_addr;
405
406 saved_ipv6only = sk->sk_ipv6only;
407 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
408 sk->sk_ipv6only = 1;
409
410 /* Make sure we are allowed to bind here. */
411 if (snum || !(inet->bind_address_no_port ||
412 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
413 if (sk->sk_prot->get_port(sk, snum)) {
414 sk->sk_ipv6only = saved_ipv6only;
415 inet_reset_saddr(sk);
416 err = -EADDRINUSE;
417 goto out;
418 }
419 if (!(flags & BIND_FROM_BPF)) {
420 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
421 if (err) {
422 sk->sk_ipv6only = saved_ipv6only;
423 inet_reset_saddr(sk);
424 goto out;
425 }
426 }
427 }
428
429 if (addr_type != IPV6_ADDR_ANY)
430 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
431 if (snum)
432 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
433 inet->inet_sport = htons(inet->inet_num);
434 inet->inet_dport = 0;
435 inet->inet_daddr = 0;
436 out:
437 if (flags & BIND_WITH_LOCK)
438 release_sock(sk);
439 return err;
440 out_unlock:
441 rcu_read_unlock();
442 goto out;
443 }
444
445 /* bind for INET6 API */
inet6_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)446 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
447 {
448 struct sock *sk = sock->sk;
449 const struct proto *prot;
450 int err = 0;
451
452 /* If the socket has its own bind function then use it. */
453 prot = READ_ONCE(sk->sk_prot);
454 if (prot->bind)
455 return prot->bind(sk, uaddr, addr_len);
456
457 if (addr_len < SIN6_LEN_RFC2133)
458 return -EINVAL;
459
460 /* BPF prog is run before any checks are done so that if the prog
461 * changes context in a wrong way it will be caught.
462 */
463 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
464 if (err)
465 return err;
466
467 return __inet6_bind(sk, uaddr, addr_len, BIND_WITH_LOCK);
468 }
469 EXPORT_SYMBOL(inet6_bind);
470
inet6_release(struct socket * sock)471 int inet6_release(struct socket *sock)
472 {
473 struct sock *sk = sock->sk;
474
475 if (!sk)
476 return -EINVAL;
477
478 /* Free mc lists */
479 ipv6_sock_mc_close(sk);
480
481 /* Free ac lists */
482 ipv6_sock_ac_close(sk);
483
484 return inet_release(sock);
485 }
486 EXPORT_SYMBOL(inet6_release);
487
inet6_destroy_sock(struct sock * sk)488 void inet6_destroy_sock(struct sock *sk)
489 {
490 struct ipv6_pinfo *np = inet6_sk(sk);
491 struct sk_buff *skb;
492 struct ipv6_txoptions *opt;
493
494 /* Release rx options */
495
496 skb = xchg(&np->pktoptions, NULL);
497 kfree_skb(skb);
498
499 skb = xchg(&np->rxpmtu, NULL);
500 kfree_skb(skb);
501
502 /* Free flowlabels */
503 fl6_free_socklist(sk);
504
505 /* Free tx options */
506
507 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
508 if (opt) {
509 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
510 txopt_put(opt);
511 }
512 }
513 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
514
inet6_cleanup_sock(struct sock * sk)515 void inet6_cleanup_sock(struct sock *sk)
516 {
517 inet6_destroy_sock(sk);
518 }
519 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
520
521 /*
522 * This does both peername and sockname.
523 */
inet6_getname(struct socket * sock,struct sockaddr * uaddr,int peer)524 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
525 int peer)
526 {
527 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
528 struct sock *sk = sock->sk;
529 struct inet_sock *inet = inet_sk(sk);
530 struct ipv6_pinfo *np = inet6_sk(sk);
531
532 sin->sin6_family = AF_INET6;
533 sin->sin6_flowinfo = 0;
534 sin->sin6_scope_id = 0;
535 if (peer) {
536 if (!inet->inet_dport)
537 return -ENOTCONN;
538 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
539 peer == 1)
540 return -ENOTCONN;
541 sin->sin6_port = inet->inet_dport;
542 sin->sin6_addr = sk->sk_v6_daddr;
543 if (np->sndflow)
544 sin->sin6_flowinfo = np->flow_label;
545 } else {
546 if (ipv6_addr_any(&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 }
552 if (cgroup_bpf_enabled)
553 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
554 peer ? BPF_CGROUP_INET6_GETPEERNAME :
555 BPF_CGROUP_INET6_GETSOCKNAME,
556 NULL);
557 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
558 sk->sk_bound_dev_if);
559 return sizeof(*sin);
560 }
561 EXPORT_SYMBOL(inet6_getname);
562
inet6_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)563 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
564 {
565 void __user *argp = (void __user *)arg;
566 struct sock *sk = sock->sk;
567 struct net *net = sock_net(sk);
568 const struct proto *prot;
569
570 switch (cmd) {
571 case SIOCADDRT:
572 case SIOCDELRT: {
573 struct in6_rtmsg rtmsg;
574
575 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
576 return -EFAULT;
577 return ipv6_route_ioctl(net, cmd, &rtmsg);
578 }
579 case SIOCSIFADDR:
580 return addrconf_add_ifaddr(net, argp);
581 case SIOCDIFADDR:
582 return addrconf_del_ifaddr(net, argp);
583 case SIOCSIFDSTADDR:
584 return addrconf_set_dstaddr(net, argp);
585 default:
586 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
587 prot = READ_ONCE(sk->sk_prot);
588 if (!prot->ioctl)
589 return -ENOIOCTLCMD;
590 return 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 const struct proto *prot;
653
654 if (unlikely(inet_send_prepare(sk)))
655 return -EAGAIN;
656
657 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
658 prot = READ_ONCE(sk->sk_prot);
659 return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
660 sk, msg, size);
661 }
662
663 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
664 size_t, int, int, int *));
inet6_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)665 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
666 int flags)
667 {
668 struct sock *sk = sock->sk;
669 const struct proto *prot;
670 int addr_len = 0;
671 int err;
672
673 if (likely(!(flags & MSG_ERRQUEUE)))
674 sock_rps_record_flow(sk);
675
676 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
677 prot = READ_ONCE(sk->sk_prot);
678 err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
679 sk, msg, size, flags & MSG_DONTWAIT,
680 flags & ~MSG_DONTWAIT, &addr_len);
681 if (err >= 0)
682 msg->msg_namelen = addr_len;
683 return err;
684 }
685
686 const struct proto_ops inet6_stream_ops = {
687 .family = PF_INET6,
688 .owner = THIS_MODULE,
689 .release = inet6_release,
690 .bind = inet6_bind,
691 .connect = inet_stream_connect, /* ok */
692 .socketpair = sock_no_socketpair, /* a do nothing */
693 .accept = inet_accept, /* ok */
694 .getname = inet6_getname,
695 .poll = tcp_poll, /* ok */
696 .ioctl = inet6_ioctl, /* must change */
697 .gettstamp = sock_gettstamp,
698 .listen = inet_listen, /* ok */
699 .shutdown = inet_shutdown, /* ok */
700 .setsockopt = sock_common_setsockopt, /* ok */
701 .getsockopt = sock_common_getsockopt, /* ok */
702 .sendmsg = inet6_sendmsg, /* retpoline's sake */
703 .recvmsg = inet6_recvmsg, /* retpoline's sake */
704 #ifdef CONFIG_MMU
705 .mmap = tcp_mmap,
706 #endif
707 .sendpage = inet_sendpage,
708 .sendmsg_locked = tcp_sendmsg_locked,
709 .sendpage_locked = tcp_sendpage_locked,
710 .splice_read = tcp_splice_read,
711 .read_sock = tcp_read_sock,
712 .peek_len = tcp_peek_len,
713 #ifdef CONFIG_COMPAT
714 .compat_ioctl = inet6_compat_ioctl,
715 #endif
716 .set_rcvlowat = tcp_set_rcvlowat,
717 };
718
719 const struct proto_ops inet6_dgram_ops = {
720 .family = PF_INET6,
721 .owner = THIS_MODULE,
722 .release = inet6_release,
723 .bind = inet6_bind,
724 .connect = inet_dgram_connect, /* ok */
725 .socketpair = sock_no_socketpair, /* a do nothing */
726 .accept = sock_no_accept, /* a do nothing */
727 .getname = inet6_getname,
728 .poll = udp_poll, /* ok */
729 .ioctl = inet6_ioctl, /* must change */
730 .gettstamp = sock_gettstamp,
731 .listen = sock_no_listen, /* ok */
732 .shutdown = inet_shutdown, /* ok */
733 .setsockopt = sock_common_setsockopt, /* ok */
734 .getsockopt = sock_common_getsockopt, /* ok */
735 .sendmsg = inet6_sendmsg, /* retpoline's sake */
736 .recvmsg = inet6_recvmsg, /* retpoline's sake */
737 .mmap = sock_no_mmap,
738 .sendpage = sock_no_sendpage,
739 .set_peek_off = sk_set_peek_off,
740 #ifdef CONFIG_COMPAT
741 .compat_ioctl = inet6_compat_ioctl,
742 #endif
743 };
744
745 static const struct net_proto_family inet6_family_ops = {
746 .family = PF_INET6,
747 .create = inet6_create,
748 .owner = THIS_MODULE,
749 };
750
inet6_register_protosw(struct inet_protosw * p)751 int inet6_register_protosw(struct inet_protosw *p)
752 {
753 struct list_head *lh;
754 struct inet_protosw *answer;
755 struct list_head *last_perm;
756 int protocol = p->protocol;
757 int ret;
758
759 spin_lock_bh(&inetsw6_lock);
760
761 ret = -EINVAL;
762 if (p->type >= SOCK_MAX)
763 goto out_illegal;
764
765 /* If we are trying to override a permanent protocol, bail. */
766 answer = NULL;
767 ret = -EPERM;
768 last_perm = &inetsw6[p->type];
769 list_for_each(lh, &inetsw6[p->type]) {
770 answer = list_entry(lh, struct inet_protosw, list);
771
772 /* Check only the non-wild match. */
773 if (INET_PROTOSW_PERMANENT & answer->flags) {
774 if (protocol == answer->protocol)
775 break;
776 last_perm = lh;
777 }
778
779 answer = NULL;
780 }
781 if (answer)
782 goto out_permanent;
783
784 /* Add the new entry after the last permanent entry if any, so that
785 * the new entry does not override a permanent entry when matched with
786 * a wild-card protocol. But it is allowed to override any existing
787 * non-permanent entry. This means that when we remove this entry, the
788 * system automatically returns to the old behavior.
789 */
790 list_add_rcu(&p->list, last_perm);
791 ret = 0;
792 out:
793 spin_unlock_bh(&inetsw6_lock);
794 return ret;
795
796 out_permanent:
797 pr_err("Attempt to override permanent protocol %d\n", protocol);
798 goto out;
799
800 out_illegal:
801 pr_err("Ignoring attempt to register invalid socket type %d\n",
802 p->type);
803 goto out;
804 }
805 EXPORT_SYMBOL(inet6_register_protosw);
806
807 void
inet6_unregister_protosw(struct inet_protosw * p)808 inet6_unregister_protosw(struct inet_protosw *p)
809 {
810 if (INET_PROTOSW_PERMANENT & p->flags) {
811 pr_err("Attempt to unregister permanent protocol %d\n",
812 p->protocol);
813 } else {
814 spin_lock_bh(&inetsw6_lock);
815 list_del_rcu(&p->list);
816 spin_unlock_bh(&inetsw6_lock);
817
818 synchronize_net();
819 }
820 }
821 EXPORT_SYMBOL(inet6_unregister_protosw);
822
inet6_sk_rebuild_header(struct sock * sk)823 int inet6_sk_rebuild_header(struct sock *sk)
824 {
825 struct ipv6_pinfo *np = inet6_sk(sk);
826 struct dst_entry *dst;
827
828 dst = __sk_dst_check(sk, np->dst_cookie);
829
830 if (!dst) {
831 struct inet_sock *inet = inet_sk(sk);
832 struct in6_addr *final_p, final;
833 struct flowi6 fl6;
834
835 memset(&fl6, 0, sizeof(fl6));
836 fl6.flowi6_proto = sk->sk_protocol;
837 fl6.daddr = sk->sk_v6_daddr;
838 fl6.saddr = np->saddr;
839 fl6.flowlabel = np->flow_label;
840 fl6.flowi6_oif = sk->sk_bound_dev_if;
841 fl6.flowi6_mark = sk->sk_mark;
842 fl6.fl6_dport = inet->inet_dport;
843 fl6.fl6_sport = inet->inet_sport;
844 fl6.flowi6_uid = sk->sk_uid;
845 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
846
847 rcu_read_lock();
848 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
849 &final);
850 rcu_read_unlock();
851
852 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
853 if (IS_ERR(dst)) {
854 sk->sk_route_caps = 0;
855 sk->sk_err_soft = -PTR_ERR(dst);
856 return PTR_ERR(dst);
857 }
858
859 ip6_dst_store(sk, dst, NULL, NULL);
860 }
861
862 return 0;
863 }
864 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
865
ipv6_opt_accepted(const struct sock * sk,const struct sk_buff * skb,const struct inet6_skb_parm * opt)866 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
867 const struct inet6_skb_parm *opt)
868 {
869 const struct ipv6_pinfo *np = inet6_sk(sk);
870
871 if (np->rxopt.all) {
872 if (((opt->flags & IP6SKB_HOPBYHOP) &&
873 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
874 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
875 np->rxopt.bits.rxflow) ||
876 (opt->srcrt && (np->rxopt.bits.srcrt ||
877 np->rxopt.bits.osrcrt)) ||
878 ((opt->dst1 || opt->dst0) &&
879 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
880 return true;
881 }
882 return false;
883 }
884 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
885
886 static struct packet_type ipv6_packet_type __read_mostly = {
887 .type = cpu_to_be16(ETH_P_IPV6),
888 .func = ipv6_rcv,
889 .list_func = ipv6_list_rcv,
890 };
891
ipv6_packet_init(void)892 static int __init ipv6_packet_init(void)
893 {
894 dev_add_pack(&ipv6_packet_type);
895 return 0;
896 }
897
ipv6_packet_cleanup(void)898 static void ipv6_packet_cleanup(void)
899 {
900 dev_remove_pack(&ipv6_packet_type);
901 }
902
ipv6_init_mibs(struct net * net)903 static int __net_init ipv6_init_mibs(struct net *net)
904 {
905 int i;
906
907 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
908 if (!net->mib.udp_stats_in6)
909 return -ENOMEM;
910 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
911 if (!net->mib.udplite_stats_in6)
912 goto err_udplite_mib;
913 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
914 if (!net->mib.ipv6_statistics)
915 goto err_ip_mib;
916
917 for_each_possible_cpu(i) {
918 struct ipstats_mib *af_inet6_stats;
919 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
920 u64_stats_init(&af_inet6_stats->syncp);
921 }
922
923
924 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
925 if (!net->mib.icmpv6_statistics)
926 goto err_icmp_mib;
927 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
928 GFP_KERNEL);
929 if (!net->mib.icmpv6msg_statistics)
930 goto err_icmpmsg_mib;
931 return 0;
932
933 err_icmpmsg_mib:
934 free_percpu(net->mib.icmpv6_statistics);
935 err_icmp_mib:
936 free_percpu(net->mib.ipv6_statistics);
937 err_ip_mib:
938 free_percpu(net->mib.udplite_stats_in6);
939 err_udplite_mib:
940 free_percpu(net->mib.udp_stats_in6);
941 return -ENOMEM;
942 }
943
ipv6_cleanup_mibs(struct net * net)944 static void ipv6_cleanup_mibs(struct net *net)
945 {
946 free_percpu(net->mib.udp_stats_in6);
947 free_percpu(net->mib.udplite_stats_in6);
948 free_percpu(net->mib.ipv6_statistics);
949 free_percpu(net->mib.icmpv6_statistics);
950 kfree(net->mib.icmpv6msg_statistics);
951 }
952
inet6_net_init(struct net * net)953 static int __net_init inet6_net_init(struct net *net)
954 {
955 int err = 0;
956
957 net->ipv6.sysctl.bindv6only = 0;
958 net->ipv6.sysctl.icmpv6_time = 1*HZ;
959 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
960 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
961 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
962
963 /* By default, rate limit error messages.
964 * Except for pmtu discovery, it would break it.
965 * proc_do_large_bitmap needs pointer to the bitmap.
966 */
967 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
968 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
969 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
970
971 net->ipv6.sysctl.flowlabel_consistency = 1;
972 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
973 net->ipv6.sysctl.idgen_retries = 3;
974 net->ipv6.sysctl.idgen_delay = 1 * HZ;
975 net->ipv6.sysctl.flowlabel_state_ranges = 0;
976 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
977 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
978 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
979 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
980 atomic_set(&net->ipv6.fib6_sernum, 1);
981
982 err = ipv6_init_mibs(net);
983 if (err)
984 return err;
985 #ifdef CONFIG_PROC_FS
986 err = udp6_proc_init(net);
987 if (err)
988 goto out;
989 err = tcp6_proc_init(net);
990 if (err)
991 goto proc_tcp6_fail;
992 err = ac6_proc_init(net);
993 if (err)
994 goto proc_ac6_fail;
995 #endif
996 return err;
997
998 #ifdef CONFIG_PROC_FS
999 proc_ac6_fail:
1000 tcp6_proc_exit(net);
1001 proc_tcp6_fail:
1002 udp6_proc_exit(net);
1003 out:
1004 ipv6_cleanup_mibs(net);
1005 return err;
1006 #endif
1007 }
1008
inet6_net_exit(struct net * net)1009 static void __net_exit inet6_net_exit(struct net *net)
1010 {
1011 #ifdef CONFIG_PROC_FS
1012 udp6_proc_exit(net);
1013 tcp6_proc_exit(net);
1014 ac6_proc_exit(net);
1015 #endif
1016 ipv6_cleanup_mibs(net);
1017 }
1018
1019 static struct pernet_operations inet6_net_ops = {
1020 .init = inet6_net_init,
1021 .exit = inet6_net_exit,
1022 };
1023
ipv6_route_input(struct sk_buff * skb)1024 static int ipv6_route_input(struct sk_buff *skb)
1025 {
1026 ip6_route_input(skb);
1027 return skb_dst(skb)->error;
1028 }
1029
1030 static const struct ipv6_stub ipv6_stub_impl = {
1031 .ipv6_sock_mc_join = ipv6_sock_mc_join,
1032 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1033 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1034 .ipv6_route_input = ipv6_route_input,
1035 .fib6_get_table = fib6_get_table,
1036 .fib6_table_lookup = fib6_table_lookup,
1037 .fib6_lookup = fib6_lookup,
1038 .fib6_select_path = fib6_select_path,
1039 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1040 .fib6_nh_init = fib6_nh_init,
1041 .fib6_nh_release = fib6_nh_release,
1042 .fib6_nh_release_dsts = fib6_nh_release_dsts,
1043 .fib6_update_sernum = fib6_update_sernum_stub,
1044 .fib6_rt_update = fib6_rt_update,
1045 .ip6_del_rt = ip6_del_rt,
1046 .udpv6_encap_enable = udpv6_encap_enable,
1047 .ndisc_send_na = ndisc_send_na,
1048 #if IS_ENABLED(CONFIG_XFRM)
1049 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1050 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1051 .xfrm6_rcv_encap = xfrm6_rcv_encap,
1052 #endif
1053 .nd_tbl = &nd_tbl,
1054 .ipv6_fragment = ip6_fragment,
1055 };
1056
1057 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1058 .inet6_bind = __inet6_bind,
1059 .udp6_lib_lookup = __udp6_lib_lookup,
1060 };
1061
inet6_init(void)1062 static int __init inet6_init(void)
1063 {
1064 struct list_head *r;
1065 int err = 0;
1066
1067 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1068
1069 /* Register the socket-side information for inet6_create. */
1070 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1071 INIT_LIST_HEAD(r);
1072
1073 if (disable_ipv6_mod) {
1074 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1075 goto out;
1076 }
1077
1078 err = proto_register(&tcpv6_prot, 1);
1079 if (err)
1080 goto out;
1081
1082 err = proto_register(&udpv6_prot, 1);
1083 if (err)
1084 goto out_unregister_tcp_proto;
1085
1086 err = proto_register(&udplitev6_prot, 1);
1087 if (err)
1088 goto out_unregister_udp_proto;
1089
1090 err = proto_register(&rawv6_prot, 1);
1091 if (err)
1092 goto out_unregister_udplite_proto;
1093
1094 err = proto_register(&pingv6_prot, 1);
1095 if (err)
1096 goto out_unregister_raw_proto;
1097
1098 /* We MUST register RAW sockets before we create the ICMP6,
1099 * IGMP6, or NDISC control sockets.
1100 */
1101 err = rawv6_init();
1102 if (err)
1103 goto out_unregister_ping_proto;
1104
1105 /* Register the family here so that the init calls below will
1106 * be able to create sockets. (?? is this dangerous ??)
1107 */
1108 err = sock_register(&inet6_family_ops);
1109 if (err)
1110 goto out_sock_register_fail;
1111
1112 /*
1113 * ipngwg API draft makes clear that the correct semantics
1114 * for TCP and UDP is to consider one TCP and UDP instance
1115 * in a host available by both INET and INET6 APIs and
1116 * able to communicate via both network protocols.
1117 */
1118
1119 err = register_pernet_subsys(&inet6_net_ops);
1120 if (err)
1121 goto register_pernet_fail;
1122 err = ip6_mr_init();
1123 if (err)
1124 goto ipmr_fail;
1125 err = icmpv6_init();
1126 if (err)
1127 goto icmp_fail;
1128 err = ndisc_init();
1129 if (err)
1130 goto ndisc_fail;
1131 err = igmp6_init();
1132 if (err)
1133 goto igmp_fail;
1134
1135 err = ipv6_netfilter_init();
1136 if (err)
1137 goto netfilter_fail;
1138 /* Create /proc/foo6 entries. */
1139 #ifdef CONFIG_PROC_FS
1140 err = -ENOMEM;
1141 if (raw6_proc_init())
1142 goto proc_raw6_fail;
1143 if (udplite6_proc_init())
1144 goto proc_udplite6_fail;
1145 if (ipv6_misc_proc_init())
1146 goto proc_misc6_fail;
1147 if (if6_proc_init())
1148 goto proc_if6_fail;
1149 #endif
1150 err = ip6_route_init();
1151 if (err)
1152 goto ip6_route_fail;
1153 err = ndisc_late_init();
1154 if (err)
1155 goto ndisc_late_fail;
1156 err = ip6_flowlabel_init();
1157 if (err)
1158 goto ip6_flowlabel_fail;
1159 err = ipv6_anycast_init();
1160 if (err)
1161 goto ipv6_anycast_fail;
1162 err = addrconf_init();
1163 if (err)
1164 goto addrconf_fail;
1165
1166 /* Init v6 extension headers. */
1167 err = ipv6_exthdrs_init();
1168 if (err)
1169 goto ipv6_exthdrs_fail;
1170
1171 err = ipv6_frag_init();
1172 if (err)
1173 goto ipv6_frag_fail;
1174
1175 /* Init v6 transport protocols. */
1176 err = udpv6_init();
1177 if (err)
1178 goto udpv6_fail;
1179
1180 err = udplitev6_init();
1181 if (err)
1182 goto udplitev6_fail;
1183
1184 err = udpv6_offload_init();
1185 if (err)
1186 goto udpv6_offload_fail;
1187
1188 err = tcpv6_init();
1189 if (err)
1190 goto tcpv6_fail;
1191
1192 err = ipv6_packet_init();
1193 if (err)
1194 goto ipv6_packet_fail;
1195
1196 err = pingv6_init();
1197 if (err)
1198 goto pingv6_fail;
1199
1200 err = calipso_init();
1201 if (err)
1202 goto calipso_fail;
1203
1204 err = seg6_init();
1205 if (err)
1206 goto seg6_fail;
1207
1208 err = rpl_init();
1209 if (err)
1210 goto rpl_fail;
1211
1212 err = igmp6_late_init();
1213 if (err)
1214 goto igmp6_late_err;
1215
1216 #ifdef CONFIG_SYSCTL
1217 err = ipv6_sysctl_register();
1218 if (err)
1219 goto sysctl_fail;
1220 #endif
1221
1222 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1223 wmb();
1224 ipv6_stub = &ipv6_stub_impl;
1225 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1226 out:
1227 return err;
1228
1229 #ifdef CONFIG_SYSCTL
1230 sysctl_fail:
1231 igmp6_late_cleanup();
1232 #endif
1233 igmp6_late_err:
1234 rpl_exit();
1235 rpl_fail:
1236 seg6_exit();
1237 seg6_fail:
1238 calipso_exit();
1239 calipso_fail:
1240 pingv6_exit();
1241 pingv6_fail:
1242 ipv6_packet_cleanup();
1243 ipv6_packet_fail:
1244 tcpv6_exit();
1245 tcpv6_fail:
1246 udpv6_offload_exit();
1247 udpv6_offload_fail:
1248 udplitev6_exit();
1249 udplitev6_fail:
1250 udpv6_exit();
1251 udpv6_fail:
1252 ipv6_frag_exit();
1253 ipv6_frag_fail:
1254 ipv6_exthdrs_exit();
1255 ipv6_exthdrs_fail:
1256 addrconf_cleanup();
1257 addrconf_fail:
1258 ipv6_anycast_cleanup();
1259 ipv6_anycast_fail:
1260 ip6_flowlabel_cleanup();
1261 ip6_flowlabel_fail:
1262 ndisc_late_cleanup();
1263 ndisc_late_fail:
1264 ip6_route_cleanup();
1265 ip6_route_fail:
1266 #ifdef CONFIG_PROC_FS
1267 if6_proc_exit();
1268 proc_if6_fail:
1269 ipv6_misc_proc_exit();
1270 proc_misc6_fail:
1271 udplite6_proc_exit();
1272 proc_udplite6_fail:
1273 raw6_proc_exit();
1274 proc_raw6_fail:
1275 #endif
1276 ipv6_netfilter_fini();
1277 netfilter_fail:
1278 igmp6_cleanup();
1279 igmp_fail:
1280 ndisc_cleanup();
1281 ndisc_fail:
1282 icmpv6_cleanup();
1283 icmp_fail:
1284 ip6_mr_cleanup();
1285 ipmr_fail:
1286 unregister_pernet_subsys(&inet6_net_ops);
1287 register_pernet_fail:
1288 sock_unregister(PF_INET6);
1289 rtnl_unregister_all(PF_INET6);
1290 out_sock_register_fail:
1291 rawv6_exit();
1292 out_unregister_ping_proto:
1293 proto_unregister(&pingv6_prot);
1294 out_unregister_raw_proto:
1295 proto_unregister(&rawv6_prot);
1296 out_unregister_udplite_proto:
1297 proto_unregister(&udplitev6_prot);
1298 out_unregister_udp_proto:
1299 proto_unregister(&udpv6_prot);
1300 out_unregister_tcp_proto:
1301 proto_unregister(&tcpv6_prot);
1302 goto out;
1303 }
1304 module_init(inet6_init);
1305
1306 MODULE_ALIAS_NETPROTO(PF_INET6);
1307