2 * PF_INET6 socket protocol family
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Adapted from linux/net/ipv4/af_inet.c
10 * $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
13 * piggy, Karl Knutson : Socket protocol table
14 * Hideaki YOSHIFUJI : sin6_scope_id support
15 * Arnaldo Melo : check proc_net_create return, cleanups
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
30 #include <linux/kernel.h>
31 #include <linux/timer.h>
32 #include <linux/string.h>
33 #include <linux/sockios.h>
34 #include <linux/net.h>
35 #include <linux/fcntl.h>
37 #include <linux/interrupt.h>
38 #include <linux/proc_fs.h>
39 #include <linux/stat.h>
40 #include <linux/init.h>
42 #include <linux/inet.h>
43 #include <linux/netdevice.h>
44 #include <linux/icmpv6.h>
45 #include <linux/netfilter_ipv6.h>
50 #include <net/udplite.h>
53 #include <net/protocol.h>
54 #include <net/inet_common.h>
55 #include <net/transp_v6.h>
56 #include <net/ip6_route.h>
57 #include <net/addrconf.h>
58 #ifdef CONFIG_IPV6_TUNNEL
59 #include <net/ip6_tunnel.h>
61 #ifdef CONFIG_IPV6_MIP6
65 #include <asm/uaccess.h>
66 #include <asm/system.h>
68 MODULE_AUTHOR("Cast of dozens");
69 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
70 MODULE_LICENSE("GPL");
72 int sysctl_ipv6_bindv6only __read_mostly;
74 /* The inetsw table contains everything that inet_create needs to
77 static struct list_head inetsw6[SOCK_MAX];
78 static DEFINE_SPINLOCK(inetsw6_lock);
80 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
82 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
84 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
87 static int inet6_create(struct socket *sock, int protocol)
89 struct inet_sock *inet;
90 struct ipv6_pinfo *np;
93 struct inet_protosw *answer;
94 struct proto *answer_prot;
95 unsigned char answer_flags;
97 int try_loading_module = 0;
100 if (sock->type != SOCK_RAW &&
101 sock->type != SOCK_DGRAM &&
103 build_ehash_secret();
105 /* Look for the requested type/protocol pair. */
108 err = -ESOCKTNOSUPPORT;
110 list_for_each_rcu(p, &inetsw6[sock->type]) {
111 answer = list_entry(p, struct inet_protosw, list);
113 /* Check the non-wild match. */
114 if (protocol == answer->protocol) {
115 if (protocol != IPPROTO_IP)
118 /* Check for the two wild cases. */
119 if (IPPROTO_IP == protocol) {
120 protocol = answer->protocol;
123 if (IPPROTO_IP == answer->protocol)
126 err = -EPROTONOSUPPORT;
131 if (try_loading_module < 2) {
134 * Be more specific, e.g. net-pf-10-proto-132-type-1
135 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
137 if (++try_loading_module == 1)
138 request_module("net-pf-%d-proto-%d-type-%d",
139 PF_INET6, protocol, sock->type);
141 * Fall back to generic, e.g. net-pf-10-proto-132
142 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
145 request_module("net-pf-%d-proto-%d",
147 goto lookup_protocol;
153 if (answer->capability > 0 && !capable(answer->capability))
156 sock->ops = answer->ops;
157 answer_prot = answer->prot;
158 answer_no_check = answer->no_check;
159 answer_flags = answer->flags;
162 BUG_TRAP(answer_prot->slab != NULL);
165 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
169 sock_init_data(sock, sk);
172 sk->sk_no_check = answer_no_check;
173 if (INET_PROTOSW_REUSE & answer_flags)
177 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
179 if (SOCK_RAW == sock->type) {
180 inet->num = protocol;
181 if (IPPROTO_RAW == protocol)
185 sk->sk_destruct = inet_sock_destruct;
186 sk->sk_family = PF_INET6;
187 sk->sk_protocol = protocol;
189 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
191 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
195 np->pmtudisc = IPV6_PMTUDISC_WANT;
196 np->ipv6only = sysctl_ipv6_bindv6only;
198 /* Init the ipv4 part of the socket since we can have sockets
199 * using v6 API for ipv4.
206 inet->mc_list = NULL;
208 if (ipv4_config.no_pmtu_disc)
209 inet->pmtudisc = IP_PMTUDISC_DONT;
211 inet->pmtudisc = IP_PMTUDISC_WANT;
213 * Increment only the relevant sk_prot->socks debug field, this changes
214 * the previous behaviour of incrementing both the equivalent to
215 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
217 * This allows better debug granularity as we'll know exactly how many
218 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
219 * transport protocol socks. -acme
221 sk_refcnt_debug_inc(sk);
224 /* It assumes that any protocol which allows
225 * the user to assign a number at socket
226 * creation time automatically shares.
228 inet->sport = htons(inet->num);
229 sk->sk_prot->hash(sk);
231 if (sk->sk_prot->init) {
232 err = sk->sk_prot->init(sk);
234 sk_common_release(sk);
246 /* bind for INET6 API */
247 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
249 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
250 struct sock *sk = sock->sk;
251 struct inet_sock *inet = inet_sk(sk);
252 struct ipv6_pinfo *np = inet6_sk(sk);
258 /* If the socket has its own bind function then use it. */
259 if (sk->sk_prot->bind)
260 return sk->sk_prot->bind(sk, uaddr, addr_len);
262 if (addr_len < SIN6_LEN_RFC2133)
264 addr_type = ipv6_addr_type(&addr->sin6_addr);
265 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
268 snum = ntohs(addr->sin6_port);
269 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
274 /* Check these errors (active socket, double bind). */
275 if (sk->sk_state != TCP_CLOSE || inet->num) {
280 /* Check if the address belongs to the host. */
281 if (addr_type == IPV6_ADDR_MAPPED) {
282 v4addr = addr->sin6_addr.s6_addr32[3];
283 if (inet_addr_type(v4addr) != RTN_LOCAL) {
284 err = -EADDRNOTAVAIL;
288 if (addr_type != IPV6_ADDR_ANY) {
289 struct net_device *dev = NULL;
291 if (addr_type & IPV6_ADDR_LINKLOCAL) {
292 if (addr_len >= sizeof(struct sockaddr_in6) &&
293 addr->sin6_scope_id) {
294 /* Override any existing binding, if another one
295 * is supplied by user.
297 sk->sk_bound_dev_if = addr->sin6_scope_id;
300 /* Binding to link-local address requires an interface */
301 if (!sk->sk_bound_dev_if) {
305 dev = dev_get_by_index(sk->sk_bound_dev_if);
312 /* ipv4 addr of the socket is invalid. Only the
313 * unspecified and mapped address have a v4 equivalent.
315 v4addr = LOOPBACK4_IPV6;
316 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
317 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
320 err = -EADDRNOTAVAIL;
329 inet->rcv_saddr = v4addr;
330 inet->saddr = v4addr;
332 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
334 if (!(addr_type & IPV6_ADDR_MULTICAST))
335 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
337 /* Make sure we are allowed to bind here. */
338 if (sk->sk_prot->get_port(sk, snum)) {
339 inet_reset_saddr(sk);
344 if (addr_type != IPV6_ADDR_ANY)
345 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
347 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
348 inet->sport = htons(inet->num);
356 EXPORT_SYMBOL(inet6_bind);
358 int inet6_release(struct socket *sock)
360 struct sock *sk = sock->sk;
366 ipv6_sock_mc_close(sk);
369 ipv6_sock_ac_close(sk);
371 return inet_release(sock);
374 EXPORT_SYMBOL(inet6_release);
376 int inet6_destroy_sock(struct sock *sk)
378 struct ipv6_pinfo *np = inet6_sk(sk);
380 struct ipv6_txoptions *opt;
382 /* Release rx options */
384 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
387 /* Free flowlabels */
388 fl6_free_socklist(sk);
390 /* Free tx options */
392 if ((opt = xchg(&np->opt, NULL)) != NULL)
393 sock_kfree_s(sk, opt, opt->tot_len);
398 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
401 * This does both peername and sockname.
404 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
405 int *uaddr_len, int peer)
407 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
408 struct sock *sk = sock->sk;
409 struct inet_sock *inet = inet_sk(sk);
410 struct ipv6_pinfo *np = inet6_sk(sk);
412 sin->sin6_family = AF_INET6;
413 sin->sin6_flowinfo = 0;
414 sin->sin6_scope_id = 0;
418 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
421 sin->sin6_port = inet->dport;
422 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
424 sin->sin6_flowinfo = np->flow_label;
426 if (ipv6_addr_any(&np->rcv_saddr))
427 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
429 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
431 sin->sin6_port = inet->sport;
433 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
434 sin->sin6_scope_id = sk->sk_bound_dev_if;
435 *uaddr_len = sizeof(*sin);
439 EXPORT_SYMBOL(inet6_getname);
441 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
443 struct sock *sk = sock->sk;
448 return sock_get_timestamp(sk, (struct timeval __user *)arg);
451 return sock_get_timestampns(sk, (struct timespec __user *)arg);
456 return(ipv6_route_ioctl(cmd,(void __user *)arg));
459 return addrconf_add_ifaddr((void __user *) arg);
461 return addrconf_del_ifaddr((void __user *) arg);
463 return addrconf_set_dstaddr((void __user *) arg);
465 if (!sk->sk_prot->ioctl)
467 return sk->sk_prot->ioctl(sk, cmd, arg);
473 EXPORT_SYMBOL(inet6_ioctl);
475 const struct proto_ops inet6_stream_ops = {
477 .owner = THIS_MODULE,
478 .release = inet6_release,
480 .connect = inet_stream_connect, /* ok */
481 .socketpair = sock_no_socketpair, /* a do nothing */
482 .accept = inet_accept, /* ok */
483 .getname = inet6_getname,
484 .poll = tcp_poll, /* ok */
485 .ioctl = inet6_ioctl, /* must change */
486 .listen = inet_listen, /* ok */
487 .shutdown = inet_shutdown, /* ok */
488 .setsockopt = sock_common_setsockopt, /* ok */
489 .getsockopt = sock_common_getsockopt, /* ok */
490 .sendmsg = inet_sendmsg, /* ok */
491 .recvmsg = sock_common_recvmsg, /* ok */
492 .mmap = sock_no_mmap,
493 .sendpage = tcp_sendpage,
495 .compat_setsockopt = compat_sock_common_setsockopt,
496 .compat_getsockopt = compat_sock_common_getsockopt,
500 const struct proto_ops inet6_dgram_ops = {
502 .owner = THIS_MODULE,
503 .release = inet6_release,
505 .connect = inet_dgram_connect, /* ok */
506 .socketpair = sock_no_socketpair, /* a do nothing */
507 .accept = sock_no_accept, /* a do nothing */
508 .getname = inet6_getname,
509 .poll = udp_poll, /* ok */
510 .ioctl = inet6_ioctl, /* must change */
511 .listen = sock_no_listen, /* ok */
512 .shutdown = inet_shutdown, /* ok */
513 .setsockopt = sock_common_setsockopt, /* ok */
514 .getsockopt = sock_common_getsockopt, /* ok */
515 .sendmsg = inet_sendmsg, /* ok */
516 .recvmsg = sock_common_recvmsg, /* ok */
517 .mmap = sock_no_mmap,
518 .sendpage = sock_no_sendpage,
520 .compat_setsockopt = compat_sock_common_setsockopt,
521 .compat_getsockopt = compat_sock_common_getsockopt,
525 static struct net_proto_family inet6_family_ops = {
527 .create = inet6_create,
528 .owner = THIS_MODULE,
531 /* Same as inet6_dgram_ops, sans udp_poll. */
532 static const struct proto_ops inet6_sockraw_ops = {
534 .owner = THIS_MODULE,
535 .release = inet6_release,
537 .connect = inet_dgram_connect, /* ok */
538 .socketpair = sock_no_socketpair, /* a do nothing */
539 .accept = sock_no_accept, /* a do nothing */
540 .getname = inet6_getname,
541 .poll = datagram_poll, /* ok */
542 .ioctl = inet6_ioctl, /* must change */
543 .listen = sock_no_listen, /* ok */
544 .shutdown = inet_shutdown, /* ok */
545 .setsockopt = sock_common_setsockopt, /* ok */
546 .getsockopt = sock_common_getsockopt, /* ok */
547 .sendmsg = inet_sendmsg, /* ok */
548 .recvmsg = sock_common_recvmsg, /* ok */
549 .mmap = sock_no_mmap,
550 .sendpage = sock_no_sendpage,
552 .compat_setsockopt = compat_sock_common_setsockopt,
553 .compat_getsockopt = compat_sock_common_getsockopt,
557 static struct inet_protosw rawv6_protosw = {
559 .protocol = IPPROTO_IP, /* wild card */
561 .ops = &inet6_sockraw_ops,
562 .capability = CAP_NET_RAW,
563 .no_check = UDP_CSUM_DEFAULT,
564 .flags = INET_PROTOSW_REUSE,
568 inet6_register_protosw(struct inet_protosw *p)
570 struct list_head *lh;
571 struct inet_protosw *answer;
572 int protocol = p->protocol;
573 struct list_head *last_perm;
575 spin_lock_bh(&inetsw6_lock);
577 if (p->type >= SOCK_MAX)
580 /* If we are trying to override a permanent protocol, bail. */
582 last_perm = &inetsw6[p->type];
583 list_for_each(lh, &inetsw6[p->type]) {
584 answer = list_entry(lh, struct inet_protosw, list);
586 /* Check only the non-wild match. */
587 if (INET_PROTOSW_PERMANENT & answer->flags) {
588 if (protocol == answer->protocol)
598 /* Add the new entry after the last permanent entry if any, so that
599 * the new entry does not override a permanent entry when matched with
600 * a wild-card protocol. But it is allowed to override any existing
601 * non-permanent entry. This means that when we remove this entry, the
602 * system automatically returns to the old behavior.
604 list_add_rcu(&p->list, last_perm);
606 spin_unlock_bh(&inetsw6_lock);
610 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
616 "Ignoring attempt to register invalid socket type %d.\n",
621 EXPORT_SYMBOL(inet6_register_protosw);
624 inet6_unregister_protosw(struct inet_protosw *p)
626 if (INET_PROTOSW_PERMANENT & p->flags) {
628 "Attempt to unregister permanent protocol %d.\n",
631 spin_lock_bh(&inetsw6_lock);
632 list_del_rcu(&p->list);
633 spin_unlock_bh(&inetsw6_lock);
639 EXPORT_SYMBOL(inet6_unregister_protosw);
641 int inet6_sk_rebuild_header(struct sock *sk)
644 struct dst_entry *dst;
645 struct ipv6_pinfo *np = inet6_sk(sk);
647 dst = __sk_dst_check(sk, np->dst_cookie);
650 struct inet_sock *inet = inet_sk(sk);
651 struct in6_addr *final_p = NULL, final;
654 memset(&fl, 0, sizeof(fl));
655 fl.proto = sk->sk_protocol;
656 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
657 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
658 fl.fl6_flowlabel = np->flow_label;
659 fl.oif = sk->sk_bound_dev_if;
660 fl.fl_ip_dport = inet->dport;
661 fl.fl_ip_sport = inet->sport;
662 security_sk_classify_flow(sk, &fl);
664 if (np->opt && np->opt->srcrt) {
665 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
666 ipv6_addr_copy(&final, &fl.fl6_dst);
667 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
671 err = ip6_dst_lookup(sk, &dst, &fl);
673 sk->sk_route_caps = 0;
677 ipv6_addr_copy(&fl.fl6_dst, final_p);
679 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
680 sk->sk_err_soft = -err;
684 __ip6_dst_store(sk, dst, NULL, NULL);
690 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
692 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
694 struct ipv6_pinfo *np = inet6_sk(sk);
695 struct inet6_skb_parm *opt = IP6CB(skb);
698 if ((opt->hop && (np->rxopt.bits.hopopts ||
699 np->rxopt.bits.ohopopts)) ||
700 ((IPV6_FLOWINFO_MASK &
701 *(__be32 *)skb_network_header(skb)) &&
702 np->rxopt.bits.rxflow) ||
703 (opt->srcrt && (np->rxopt.bits.srcrt ||
704 np->rxopt.bits.osrcrt)) ||
705 ((opt->dst1 || opt->dst0) &&
706 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
712 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
714 static int __init init_ipv6_mibs(void)
716 if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
717 __alignof__(struct ipstats_mib)) < 0)
719 if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
720 __alignof__(struct icmpv6_mib)) < 0)
722 if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
723 __alignof__(struct udp_mib)) < 0)
725 if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
726 __alignof__(struct udp_mib)) < 0)
727 goto err_udplite_mib;
731 snmp_mib_free((void **)udp_stats_in6);
733 snmp_mib_free((void **)icmpv6_statistics);
735 snmp_mib_free((void **)ipv6_statistics);
741 static void cleanup_ipv6_mibs(void)
743 snmp_mib_free((void **)ipv6_statistics);
744 snmp_mib_free((void **)icmpv6_statistics);
745 snmp_mib_free((void **)udp_stats_in6);
746 snmp_mib_free((void **)udplite_stats_in6);
749 static int __init inet6_init(void)
751 struct sk_buff *dummy_skb;
755 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
758 #if 0 /* FIXME --RR */
759 if (!mod_member_present(&__this_module, can_unload))
762 __this_module.can_unload = &ipv6_unload;
766 err = proto_register(&tcpv6_prot, 1);
770 err = proto_register(&udpv6_prot, 1);
772 goto out_unregister_tcp_proto;
774 err = proto_register(&udplitev6_prot, 1);
776 goto out_unregister_udp_proto;
778 err = proto_register(&rawv6_prot, 1);
780 goto out_unregister_udplite_proto;
783 /* Register the socket-side information for inet6_create. */
784 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
787 /* We MUST register RAW sockets before we create the ICMP6,
788 * IGMP6, or NDISC control sockets.
790 inet6_register_protosw(&rawv6_protosw);
792 /* Register the family here so that the init calls below will
793 * be able to create sockets. (?? is this dangerous ??)
795 err = sock_register(&inet6_family_ops);
797 goto out_unregister_raw_proto;
799 /* Initialise ipv6 mibs */
800 err = init_ipv6_mibs();
802 goto out_unregister_sock;
805 * ipngwg API draft makes clear that the correct semantics
806 * for TCP and UDP is to consider one TCP and UDP instance
807 * in a host availiable by both INET and INET6 APIs and
808 * able to communicate via both network protocols.
812 ipv6_sysctl_register();
814 err = icmpv6_init(&inet6_family_ops);
817 err = ndisc_init(&inet6_family_ops);
820 err = igmp6_init(&inet6_family_ops);
823 err = ipv6_netfilter_init();
826 /* Create /proc/foo6 entries. */
827 #ifdef CONFIG_PROC_FS
829 if (raw6_proc_init())
831 if (tcp6_proc_init())
833 if (udp6_proc_init())
835 if (udplite6_proc_init())
836 goto proc_udplite6_fail;
837 if (ipv6_misc_proc_init())
838 goto proc_misc6_fail;
841 goto proc_anycast6_fail;
846 ip6_flowlabel_init();
847 err = addrconf_init();
851 /* Init v6 extension headers. */
856 #ifdef CONFIG_IPV6_MIP6
860 /* Init v6 transport protocols. */
871 ip6_flowlabel_cleanup();
873 #ifdef CONFIG_PROC_FS
878 ipv6_misc_proc_exit();
880 udplite6_proc_exit();
889 ipv6_netfilter_fini();
898 ipv6_sysctl_unregister();
902 sock_unregister(PF_INET6);
903 out_unregister_raw_proto:
904 proto_unregister(&rawv6_prot);
905 out_unregister_udplite_proto:
906 proto_unregister(&udplitev6_prot);
907 out_unregister_udp_proto:
908 proto_unregister(&udpv6_prot);
909 out_unregister_tcp_proto:
910 proto_unregister(&tcpv6_prot);
913 module_init(inet6_init);
915 static void __exit inet6_exit(void)
917 /* First of all disallow new sockets creation. */
918 sock_unregister(PF_INET6);
919 /* Disallow any further netlink messages */
920 rtnl_unregister_all(PF_INET6);
922 /* Cleanup code parts. */
923 ipv6_packet_cleanup();
924 #ifdef CONFIG_IPV6_MIP6
928 ip6_flowlabel_cleanup();
930 #ifdef CONFIG_PROC_FS
932 /* Cleanup code parts. */
935 ipv6_misc_proc_exit();
936 udplite6_proc_exit();
941 ipv6_netfilter_fini();
946 ipv6_sysctl_unregister();
949 proto_unregister(&rawv6_prot);
950 proto_unregister(&udplitev6_prot);
951 proto_unregister(&udpv6_prot);
952 proto_unregister(&tcpv6_prot);
954 module_exit(inet6_exit);
956 MODULE_ALIAS_NETPROTO(PF_INET6);