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/smp_lock.h>
46 #include <linux/netfilter_ipv6.h>
51 #include <net/udplite.h>
54 #include <net/protocol.h>
55 #include <net/inet_common.h>
56 #include <net/transp_v6.h>
57 #include <net/ip6_route.h>
58 #include <net/addrconf.h>
59 #ifdef CONFIG_IPV6_TUNNEL
60 #include <net/ip6_tunnel.h>
62 #ifdef CONFIG_IPV6_MIP6
66 #include <asm/uaccess.h>
67 #include <asm/system.h>
69 MODULE_AUTHOR("Cast of dozens");
70 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
71 MODULE_LICENSE("GPL");
73 int sysctl_ipv6_bindv6only __read_mostly;
75 /* The inetsw table contains everything that inet_create needs to
78 static struct list_head inetsw6[SOCK_MAX];
79 static DEFINE_SPINLOCK(inetsw6_lock);
81 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
83 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
85 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
88 static int inet6_create(struct socket *sock, int protocol)
90 struct inet_sock *inet;
91 struct ipv6_pinfo *np;
94 struct inet_protosw *answer;
95 struct proto *answer_prot;
96 unsigned char answer_flags;
98 int try_loading_module = 0;
101 if (sock->type != SOCK_RAW &&
102 sock->type != SOCK_DGRAM &&
104 build_ehash_secret();
106 /* Look for the requested type/protocol pair. */
109 err = -ESOCKTNOSUPPORT;
111 list_for_each_rcu(p, &inetsw6[sock->type]) {
112 answer = list_entry(p, struct inet_protosw, list);
114 /* Check the non-wild match. */
115 if (protocol == answer->protocol) {
116 if (protocol != IPPROTO_IP)
119 /* Check for the two wild cases. */
120 if (IPPROTO_IP == protocol) {
121 protocol = answer->protocol;
124 if (IPPROTO_IP == answer->protocol)
127 err = -EPROTONOSUPPORT;
132 if (try_loading_module < 2) {
135 * Be more specific, e.g. net-pf-10-proto-132-type-1
136 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
138 if (++try_loading_module == 1)
139 request_module("net-pf-%d-proto-%d-type-%d",
140 PF_INET6, protocol, sock->type);
142 * Fall back to generic, e.g. net-pf-10-proto-132
143 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
146 request_module("net-pf-%d-proto-%d",
148 goto lookup_protocol;
154 if (answer->capability > 0 && !capable(answer->capability))
157 sock->ops = answer->ops;
158 answer_prot = answer->prot;
159 answer_no_check = answer->no_check;
160 answer_flags = answer->flags;
163 BUG_TRAP(answer_prot->slab != NULL);
166 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
170 sock_init_data(sock, sk);
173 sk->sk_no_check = answer_no_check;
174 if (INET_PROTOSW_REUSE & answer_flags)
178 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
180 if (SOCK_RAW == sock->type) {
181 inet->num = protocol;
182 if (IPPROTO_RAW == protocol)
186 sk->sk_destruct = inet_sock_destruct;
187 sk->sk_family = PF_INET6;
188 sk->sk_protocol = protocol;
190 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
192 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
196 np->pmtudisc = IPV6_PMTUDISC_WANT;
197 np->ipv6only = sysctl_ipv6_bindv6only;
199 /* Init the ipv4 part of the socket since we can have sockets
200 * using v6 API for ipv4.
207 inet->mc_list = NULL;
209 if (ipv4_config.no_pmtu_disc)
210 inet->pmtudisc = IP_PMTUDISC_DONT;
212 inet->pmtudisc = IP_PMTUDISC_WANT;
214 * Increment only the relevant sk_prot->socks debug field, this changes
215 * the previous behaviour of incrementing both the equivalent to
216 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
218 * This allows better debug granularity as we'll know exactly how many
219 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
220 * transport protocol socks. -acme
222 sk_refcnt_debug_inc(sk);
225 /* It assumes that any protocol which allows
226 * the user to assign a number at socket
227 * creation time automatically shares.
229 inet->sport = htons(inet->num);
230 sk->sk_prot->hash(sk);
232 if (sk->sk_prot->init) {
233 err = sk->sk_prot->init(sk);
235 sk_common_release(sk);
247 /* bind for INET6 API */
248 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
250 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
251 struct sock *sk = sock->sk;
252 struct inet_sock *inet = inet_sk(sk);
253 struct ipv6_pinfo *np = inet6_sk(sk);
259 /* If the socket has its own bind function then use it. */
260 if (sk->sk_prot->bind)
261 return sk->sk_prot->bind(sk, uaddr, addr_len);
263 if (addr_len < SIN6_LEN_RFC2133)
265 addr_type = ipv6_addr_type(&addr->sin6_addr);
266 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
269 snum = ntohs(addr->sin6_port);
270 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
275 /* Check these errors (active socket, double bind). */
276 if (sk->sk_state != TCP_CLOSE || inet->num) {
281 /* Check if the address belongs to the host. */
282 if (addr_type == IPV6_ADDR_MAPPED) {
283 v4addr = addr->sin6_addr.s6_addr32[3];
284 if (inet_addr_type(v4addr) != RTN_LOCAL) {
285 err = -EADDRNOTAVAIL;
289 if (addr_type != IPV6_ADDR_ANY) {
290 struct net_device *dev = NULL;
292 if (addr_type & IPV6_ADDR_LINKLOCAL) {
293 if (addr_len >= sizeof(struct sockaddr_in6) &&
294 addr->sin6_scope_id) {
295 /* Override any existing binding, if another one
296 * is supplied by user.
298 sk->sk_bound_dev_if = addr->sin6_scope_id;
301 /* Binding to link-local address requires an interface */
302 if (!sk->sk_bound_dev_if) {
306 dev = dev_get_by_index(sk->sk_bound_dev_if);
313 /* ipv4 addr of the socket is invalid. Only the
314 * unspecified and mapped address have a v4 equivalent.
316 v4addr = LOOPBACK4_IPV6;
317 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
318 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
321 err = -EADDRNOTAVAIL;
330 inet->rcv_saddr = v4addr;
331 inet->saddr = v4addr;
333 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
335 if (!(addr_type & IPV6_ADDR_MULTICAST))
336 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
338 /* Make sure we are allowed to bind here. */
339 if (sk->sk_prot->get_port(sk, snum)) {
340 inet_reset_saddr(sk);
345 if (addr_type != IPV6_ADDR_ANY)
346 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
348 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
349 inet->sport = htons(inet->num);
357 EXPORT_SYMBOL(inet6_bind);
359 int inet6_release(struct socket *sock)
361 struct sock *sk = sock->sk;
367 ipv6_sock_mc_close(sk);
370 ipv6_sock_ac_close(sk);
372 return inet_release(sock);
375 EXPORT_SYMBOL(inet6_release);
377 int inet6_destroy_sock(struct sock *sk)
379 struct ipv6_pinfo *np = inet6_sk(sk);
381 struct ipv6_txoptions *opt;
383 /* Release rx options */
385 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
388 /* Free flowlabels */
389 fl6_free_socklist(sk);
391 /* Free tx options */
393 if ((opt = xchg(&np->opt, NULL)) != NULL)
394 sock_kfree_s(sk, opt, opt->tot_len);
399 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
402 * This does both peername and sockname.
405 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
406 int *uaddr_len, int peer)
408 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
409 struct sock *sk = sock->sk;
410 struct inet_sock *inet = inet_sk(sk);
411 struct ipv6_pinfo *np = inet6_sk(sk);
413 sin->sin6_family = AF_INET6;
414 sin->sin6_flowinfo = 0;
415 sin->sin6_scope_id = 0;
419 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
422 sin->sin6_port = inet->dport;
423 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
425 sin->sin6_flowinfo = np->flow_label;
427 if (ipv6_addr_any(&np->rcv_saddr))
428 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
430 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
432 sin->sin6_port = inet->sport;
434 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
435 sin->sin6_scope_id = sk->sk_bound_dev_if;
436 *uaddr_len = sizeof(*sin);
440 EXPORT_SYMBOL(inet6_getname);
442 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
444 struct sock *sk = sock->sk;
449 return sock_get_timestamp(sk, (struct timeval __user *)arg);
452 return sock_get_timestampns(sk, (struct timespec __user *)arg);
457 return(ipv6_route_ioctl(cmd,(void __user *)arg));
460 return addrconf_add_ifaddr((void __user *) arg);
462 return addrconf_del_ifaddr((void __user *) arg);
464 return addrconf_set_dstaddr((void __user *) arg);
466 if (!sk->sk_prot->ioctl)
468 return sk->sk_prot->ioctl(sk, cmd, arg);
474 EXPORT_SYMBOL(inet6_ioctl);
476 const struct proto_ops inet6_stream_ops = {
478 .owner = THIS_MODULE,
479 .release = inet6_release,
481 .connect = inet_stream_connect, /* ok */
482 .socketpair = sock_no_socketpair, /* a do nothing */
483 .accept = inet_accept, /* ok */
484 .getname = inet6_getname,
485 .poll = tcp_poll, /* ok */
486 .ioctl = inet6_ioctl, /* must change */
487 .listen = inet_listen, /* ok */
488 .shutdown = inet_shutdown, /* ok */
489 .setsockopt = sock_common_setsockopt, /* ok */
490 .getsockopt = sock_common_getsockopt, /* ok */
491 .sendmsg = inet_sendmsg, /* ok */
492 .recvmsg = sock_common_recvmsg, /* ok */
493 .mmap = sock_no_mmap,
494 .sendpage = tcp_sendpage,
496 .compat_setsockopt = compat_sock_common_setsockopt,
497 .compat_getsockopt = compat_sock_common_getsockopt,
501 const struct proto_ops inet6_dgram_ops = {
503 .owner = THIS_MODULE,
504 .release = inet6_release,
506 .connect = inet_dgram_connect, /* ok */
507 .socketpair = sock_no_socketpair, /* a do nothing */
508 .accept = sock_no_accept, /* a do nothing */
509 .getname = inet6_getname,
510 .poll = udp_poll, /* ok */
511 .ioctl = inet6_ioctl, /* must change */
512 .listen = sock_no_listen, /* ok */
513 .shutdown = inet_shutdown, /* ok */
514 .setsockopt = sock_common_setsockopt, /* ok */
515 .getsockopt = sock_common_getsockopt, /* ok */
516 .sendmsg = inet_sendmsg, /* ok */
517 .recvmsg = sock_common_recvmsg, /* ok */
518 .mmap = sock_no_mmap,
519 .sendpage = sock_no_sendpage,
521 .compat_setsockopt = compat_sock_common_setsockopt,
522 .compat_getsockopt = compat_sock_common_getsockopt,
526 static struct net_proto_family inet6_family_ops = {
528 .create = inet6_create,
529 .owner = THIS_MODULE,
532 /* Same as inet6_dgram_ops, sans udp_poll. */
533 static const struct proto_ops inet6_sockraw_ops = {
535 .owner = THIS_MODULE,
536 .release = inet6_release,
538 .connect = inet_dgram_connect, /* ok */
539 .socketpair = sock_no_socketpair, /* a do nothing */
540 .accept = sock_no_accept, /* a do nothing */
541 .getname = inet6_getname,
542 .poll = datagram_poll, /* ok */
543 .ioctl = inet6_ioctl, /* must change */
544 .listen = sock_no_listen, /* ok */
545 .shutdown = inet_shutdown, /* ok */
546 .setsockopt = sock_common_setsockopt, /* ok */
547 .getsockopt = sock_common_getsockopt, /* ok */
548 .sendmsg = inet_sendmsg, /* ok */
549 .recvmsg = sock_common_recvmsg, /* ok */
550 .mmap = sock_no_mmap,
551 .sendpage = sock_no_sendpage,
553 .compat_setsockopt = compat_sock_common_setsockopt,
554 .compat_getsockopt = compat_sock_common_getsockopt,
558 static struct inet_protosw rawv6_protosw = {
560 .protocol = IPPROTO_IP, /* wild card */
562 .ops = &inet6_sockraw_ops,
563 .capability = CAP_NET_RAW,
564 .no_check = UDP_CSUM_DEFAULT,
565 .flags = INET_PROTOSW_REUSE,
569 inet6_register_protosw(struct inet_protosw *p)
571 struct list_head *lh;
572 struct inet_protosw *answer;
573 int protocol = p->protocol;
574 struct list_head *last_perm;
576 spin_lock_bh(&inetsw6_lock);
578 if (p->type >= SOCK_MAX)
581 /* If we are trying to override a permanent protocol, bail. */
583 last_perm = &inetsw6[p->type];
584 list_for_each(lh, &inetsw6[p->type]) {
585 answer = list_entry(lh, struct inet_protosw, list);
587 /* Check only the non-wild match. */
588 if (INET_PROTOSW_PERMANENT & answer->flags) {
589 if (protocol == answer->protocol)
599 /* Add the new entry after the last permanent entry if any, so that
600 * the new entry does not override a permanent entry when matched with
601 * a wild-card protocol. But it is allowed to override any existing
602 * non-permanent entry. This means that when we remove this entry, the
603 * system automatically returns to the old behavior.
605 list_add_rcu(&p->list, last_perm);
607 spin_unlock_bh(&inetsw6_lock);
611 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
617 "Ignoring attempt to register invalid socket type %d.\n",
622 EXPORT_SYMBOL(inet6_register_protosw);
625 inet6_unregister_protosw(struct inet_protosw *p)
627 if (INET_PROTOSW_PERMANENT & p->flags) {
629 "Attempt to unregister permanent protocol %d.\n",
632 spin_lock_bh(&inetsw6_lock);
633 list_del_rcu(&p->list);
634 spin_unlock_bh(&inetsw6_lock);
640 EXPORT_SYMBOL(inet6_unregister_protosw);
642 int inet6_sk_rebuild_header(struct sock *sk)
645 struct dst_entry *dst;
646 struct ipv6_pinfo *np = inet6_sk(sk);
648 dst = __sk_dst_check(sk, np->dst_cookie);
651 struct inet_sock *inet = inet_sk(sk);
652 struct in6_addr *final_p = NULL, final;
655 memset(&fl, 0, sizeof(fl));
656 fl.proto = sk->sk_protocol;
657 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
658 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
659 fl.fl6_flowlabel = np->flow_label;
660 fl.oif = sk->sk_bound_dev_if;
661 fl.fl_ip_dport = inet->dport;
662 fl.fl_ip_sport = inet->sport;
663 security_sk_classify_flow(sk, &fl);
665 if (np->opt && np->opt->srcrt) {
666 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
667 ipv6_addr_copy(&final, &fl.fl6_dst);
668 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
672 err = ip6_dst_lookup(sk, &dst, &fl);
674 sk->sk_route_caps = 0;
678 ipv6_addr_copy(&fl.fl6_dst, final_p);
680 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
681 sk->sk_err_soft = -err;
685 __ip6_dst_store(sk, dst, NULL, NULL);
691 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
693 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
695 struct ipv6_pinfo *np = inet6_sk(sk);
696 struct inet6_skb_parm *opt = IP6CB(skb);
699 if ((opt->hop && (np->rxopt.bits.hopopts ||
700 np->rxopt.bits.ohopopts)) ||
701 ((IPV6_FLOWINFO_MASK &
702 *(__be32 *)skb_network_header(skb)) &&
703 np->rxopt.bits.rxflow) ||
704 (opt->srcrt && (np->rxopt.bits.srcrt ||
705 np->rxopt.bits.osrcrt)) ||
706 ((opt->dst1 || opt->dst0) &&
707 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
713 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
715 static int __init init_ipv6_mibs(void)
717 if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
718 __alignof__(struct ipstats_mib)) < 0)
720 if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
721 __alignof__(struct icmpv6_mib)) < 0)
723 if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
724 __alignof__(struct udp_mib)) < 0)
726 if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
727 __alignof__(struct udp_mib)) < 0)
728 goto err_udplite_mib;
732 snmp_mib_free((void **)udp_stats_in6);
734 snmp_mib_free((void **)icmpv6_statistics);
736 snmp_mib_free((void **)ipv6_statistics);
742 static void cleanup_ipv6_mibs(void)
744 snmp_mib_free((void **)ipv6_statistics);
745 snmp_mib_free((void **)icmpv6_statistics);
746 snmp_mib_free((void **)udp_stats_in6);
747 snmp_mib_free((void **)udplite_stats_in6);
750 static int __init inet6_init(void)
752 struct sk_buff *dummy_skb;
756 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
759 #if 0 /* FIXME --RR */
760 if (!mod_member_present(&__this_module, can_unload))
763 __this_module.can_unload = &ipv6_unload;
767 err = proto_register(&tcpv6_prot, 1);
771 err = proto_register(&udpv6_prot, 1);
773 goto out_unregister_tcp_proto;
775 err = proto_register(&udplitev6_prot, 1);
777 goto out_unregister_udp_proto;
779 err = proto_register(&rawv6_prot, 1);
781 goto out_unregister_udplite_proto;
784 /* Register the socket-side information for inet6_create. */
785 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
788 /* We MUST register RAW sockets before we create the ICMP6,
789 * IGMP6, or NDISC control sockets.
791 inet6_register_protosw(&rawv6_protosw);
793 /* Register the family here so that the init calls below will
794 * be able to create sockets. (?? is this dangerous ??)
796 err = sock_register(&inet6_family_ops);
798 goto out_unregister_raw_proto;
800 /* Initialise ipv6 mibs */
801 err = init_ipv6_mibs();
803 goto out_unregister_sock;
806 * ipngwg API draft makes clear that the correct semantics
807 * for TCP and UDP is to consider one TCP and UDP instance
808 * in a host availiable by both INET and INET6 APIs and
809 * able to communicate via both network protocols.
813 ipv6_sysctl_register();
815 err = icmpv6_init(&inet6_family_ops);
818 err = ndisc_init(&inet6_family_ops);
821 err = igmp6_init(&inet6_family_ops);
824 err = ipv6_netfilter_init();
827 /* Create /proc/foo6 entries. */
828 #ifdef CONFIG_PROC_FS
830 if (raw6_proc_init())
832 if (tcp6_proc_init())
834 if (udp6_proc_init())
836 if (udplite6_proc_init())
837 goto proc_udplite6_fail;
838 if (ipv6_misc_proc_init())
839 goto proc_misc6_fail;
842 goto proc_anycast6_fail;
847 ip6_flowlabel_init();
848 err = addrconf_init();
852 /* Init v6 extension headers. */
857 #ifdef CONFIG_IPV6_MIP6
861 /* Init v6 transport protocols. */
872 ip6_flowlabel_cleanup();
874 #ifdef CONFIG_PROC_FS
879 ipv6_misc_proc_exit();
881 udplite6_proc_exit();
890 ipv6_netfilter_fini();
899 ipv6_sysctl_unregister();
903 sock_unregister(PF_INET6);
904 out_unregister_raw_proto:
905 proto_unregister(&rawv6_prot);
906 out_unregister_udplite_proto:
907 proto_unregister(&udplitev6_prot);
908 out_unregister_udp_proto:
909 proto_unregister(&udpv6_prot);
910 out_unregister_tcp_proto:
911 proto_unregister(&tcpv6_prot);
914 module_init(inet6_init);
916 static void __exit inet6_exit(void)
918 /* First of all disallow new sockets creation. */
919 sock_unregister(PF_INET6);
920 /* Disallow any further netlink messages */
921 rtnl_unregister_all(PF_INET6);
923 /* Cleanup code parts. */
924 ipv6_packet_cleanup();
925 #ifdef CONFIG_IPV6_MIP6
929 ip6_flowlabel_cleanup();
931 #ifdef CONFIG_PROC_FS
933 /* Cleanup code parts. */
936 ipv6_misc_proc_exit();
937 udplite6_proc_exit();
942 ipv6_netfilter_fini();
947 ipv6_sysctl_unregister();
950 proto_unregister(&rawv6_prot);
951 proto_unregister(&udplitev6_prot);
952 proto_unregister(&udpv6_prot);
953 proto_unregister(&tcpv6_prot);
955 module_exit(inet6_exit);
957 MODULE_ALIAS_NETPROTO(PF_INET6);