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/config.h>
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
30 #include <linux/kernel.h>
31 #include <linux/sched.h>
32 #include <linux/timer.h>
33 #include <linux/string.h>
34 #include <linux/sockios.h>
35 #include <linux/net.h>
36 #include <linux/fcntl.h>
38 #include <linux/interrupt.h>
39 #include <linux/proc_fs.h>
40 #include <linux/stat.h>
41 #include <linux/init.h>
43 #include <linux/inet.h>
44 #include <linux/netdevice.h>
45 #include <linux/icmpv6.h>
46 #include <linux/smp_lock.h>
47 #include <linux/netfilter_ipv6.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>
63 #include <asm/uaccess.h>
64 #include <asm/system.h>
66 MODULE_AUTHOR("Cast of dozens");
67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
68 MODULE_LICENSE("GPL");
70 int sysctl_ipv6_bindv6only;
72 /* The inetsw table contains everything that inet_create needs to
75 static struct list_head inetsw6[SOCK_MAX];
76 static DEFINE_SPINLOCK(inetsw6_lock);
78 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
80 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
82 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
85 static int inet6_create(struct socket *sock, int protocol)
87 struct inet_sock *inet;
88 struct ipv6_pinfo *np;
91 struct inet_protosw *answer;
92 struct proto *answer_prot;
93 unsigned char answer_flags;
95 int try_loading_module = 0;
98 /* Look for the requested type/protocol pair. */
101 err = -ESOCKTNOSUPPORT;
103 list_for_each_rcu(p, &inetsw6[sock->type]) {
104 answer = list_entry(p, struct inet_protosw, list);
106 /* Check the non-wild match. */
107 if (protocol == answer->protocol) {
108 if (protocol != IPPROTO_IP)
111 /* Check for the two wild cases. */
112 if (IPPROTO_IP == protocol) {
113 protocol = answer->protocol;
116 if (IPPROTO_IP == answer->protocol)
119 err = -EPROTONOSUPPORT;
124 if (try_loading_module < 2) {
127 * Be more specific, e.g. net-pf-10-proto-132-type-1
128 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
130 if (++try_loading_module == 1)
131 request_module("net-pf-%d-proto-%d-type-%d",
132 PF_INET6, protocol, sock->type);
134 * Fall back to generic, e.g. net-pf-10-proto-132
135 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
138 request_module("net-pf-%d-proto-%d",
140 goto lookup_protocol;
146 if (answer->capability > 0 && !capable(answer->capability))
149 sock->ops = answer->ops;
150 answer_prot = answer->prot;
151 answer_no_check = answer->no_check;
152 answer_flags = answer->flags;
155 BUG_TRAP(answer_prot->slab != NULL);
158 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
162 sock_init_data(sock, sk);
165 sk->sk_no_check = answer_no_check;
166 if (INET_PROTOSW_REUSE & answer_flags)
171 if (SOCK_RAW == sock->type) {
172 inet->num = protocol;
173 if (IPPROTO_RAW == protocol)
177 sk->sk_destruct = inet_sock_destruct;
178 sk->sk_family = PF_INET6;
179 sk->sk_protocol = protocol;
181 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
183 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
187 np->pmtudisc = IPV6_PMTUDISC_WANT;
188 np->ipv6only = sysctl_ipv6_bindv6only;
190 /* Init the ipv4 part of the socket since we can have sockets
191 * using v6 API for ipv4.
198 inet->mc_list = NULL;
200 if (ipv4_config.no_pmtu_disc)
201 inet->pmtudisc = IP_PMTUDISC_DONT;
203 inet->pmtudisc = IP_PMTUDISC_WANT;
205 * Increment only the relevant sk_prot->socks debug field, this changes
206 * the previous behaviour of incrementing both the equivalent to
207 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
209 * This allows better debug granularity as we'll know exactly how many
210 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
211 * transport protocol socks. -acme
213 sk_refcnt_debug_inc(sk);
216 /* It assumes that any protocol which allows
217 * the user to assign a number at socket
218 * creation time automatically shares.
220 inet->sport = ntohs(inet->num);
221 sk->sk_prot->hash(sk);
223 if (sk->sk_prot->init) {
224 err = sk->sk_prot->init(sk);
226 sk_common_release(sk);
238 /* bind for INET6 API */
239 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
241 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
242 struct sock *sk = sock->sk;
243 struct inet_sock *inet = inet_sk(sk);
244 struct ipv6_pinfo *np = inet6_sk(sk);
250 /* If the socket has its own bind function then use it. */
251 if (sk->sk_prot->bind)
252 return sk->sk_prot->bind(sk, uaddr, addr_len);
254 if (addr_len < SIN6_LEN_RFC2133)
256 addr_type = ipv6_addr_type(&addr->sin6_addr);
257 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
260 snum = ntohs(addr->sin6_port);
261 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
266 /* Check these errors (active socket, double bind). */
267 if (sk->sk_state != TCP_CLOSE || inet->num) {
272 /* Check if the address belongs to the host. */
273 if (addr_type == IPV6_ADDR_MAPPED) {
274 v4addr = addr->sin6_addr.s6_addr32[3];
275 if (inet_addr_type(v4addr) != RTN_LOCAL) {
276 err = -EADDRNOTAVAIL;
280 if (addr_type != IPV6_ADDR_ANY) {
281 struct net_device *dev = NULL;
283 if (addr_type & IPV6_ADDR_LINKLOCAL) {
284 if (addr_len >= sizeof(struct sockaddr_in6) &&
285 addr->sin6_scope_id) {
286 /* Override any existing binding, if another one
287 * is supplied by user.
289 sk->sk_bound_dev_if = addr->sin6_scope_id;
292 /* Binding to link-local address requires an interface */
293 if (!sk->sk_bound_dev_if) {
297 dev = dev_get_by_index(sk->sk_bound_dev_if);
304 /* ipv4 addr of the socket is invalid. Only the
305 * unspecified and mapped address have a v4 equivalent.
307 v4addr = LOOPBACK4_IPV6;
308 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
309 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
312 err = -EADDRNOTAVAIL;
321 inet->rcv_saddr = v4addr;
322 inet->saddr = v4addr;
324 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
326 if (!(addr_type & IPV6_ADDR_MULTICAST))
327 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
329 /* Make sure we are allowed to bind here. */
330 if (sk->sk_prot->get_port(sk, snum)) {
331 inet_reset_saddr(sk);
336 if (addr_type != IPV6_ADDR_ANY)
337 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
339 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
340 inet->sport = ntohs(inet->num);
348 int inet6_release(struct socket *sock)
350 struct sock *sk = sock->sk;
356 ipv6_sock_mc_close(sk);
359 ipv6_sock_ac_close(sk);
361 return inet_release(sock);
364 int inet6_destroy_sock(struct sock *sk)
366 struct ipv6_pinfo *np = inet6_sk(sk);
368 struct ipv6_txoptions *opt;
371 * Release destination entry
376 /* Release rx options */
378 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
381 /* Free flowlabels */
382 fl6_free_socklist(sk);
384 /* Free tx options */
386 if ((opt = xchg(&np->opt, NULL)) != NULL)
387 sock_kfree_s(sk, opt, opt->tot_len);
393 * This does both peername and sockname.
396 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
397 int *uaddr_len, int peer)
399 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
400 struct sock *sk = sock->sk;
401 struct inet_sock *inet = inet_sk(sk);
402 struct ipv6_pinfo *np = inet6_sk(sk);
404 sin->sin6_family = AF_INET6;
405 sin->sin6_flowinfo = 0;
406 sin->sin6_scope_id = 0;
410 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
413 sin->sin6_port = inet->dport;
414 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
416 sin->sin6_flowinfo = np->flow_label;
418 if (ipv6_addr_any(&np->rcv_saddr))
419 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
421 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
423 sin->sin6_port = inet->sport;
425 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
426 sin->sin6_scope_id = sk->sk_bound_dev_if;
427 *uaddr_len = sizeof(*sin);
431 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
433 struct sock *sk = sock->sk;
439 return sock_get_timestamp(sk, (struct timeval __user *)arg);
444 return(ipv6_route_ioctl(cmd,(void __user *)arg));
447 return addrconf_add_ifaddr((void __user *) arg);
449 return addrconf_del_ifaddr((void __user *) arg);
451 return addrconf_set_dstaddr((void __user *) arg);
453 if (!sk->sk_prot->ioctl ||
454 (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
455 return(dev_ioctl(cmd,(void __user *) arg));
462 struct proto_ops inet6_stream_ops = {
464 .owner = THIS_MODULE,
465 .release = inet6_release,
467 .connect = inet_stream_connect, /* ok */
468 .socketpair = sock_no_socketpair, /* a do nothing */
469 .accept = inet_accept, /* ok */
470 .getname = inet6_getname,
471 .poll = tcp_poll, /* ok */
472 .ioctl = inet6_ioctl, /* must change */
473 .listen = inet_listen, /* ok */
474 .shutdown = inet_shutdown, /* ok */
475 .setsockopt = sock_common_setsockopt, /* ok */
476 .getsockopt = sock_common_getsockopt, /* ok */
477 .sendmsg = inet_sendmsg, /* ok */
478 .recvmsg = sock_common_recvmsg, /* ok */
479 .mmap = sock_no_mmap,
480 .sendpage = tcp_sendpage
483 struct proto_ops inet6_dgram_ops = {
485 .owner = THIS_MODULE,
486 .release = inet6_release,
488 .connect = inet_dgram_connect, /* ok */
489 .socketpair = sock_no_socketpair, /* a do nothing */
490 .accept = sock_no_accept, /* a do nothing */
491 .getname = inet6_getname,
492 .poll = udp_poll, /* ok */
493 .ioctl = inet6_ioctl, /* must change */
494 .listen = sock_no_listen, /* ok */
495 .shutdown = inet_shutdown, /* ok */
496 .setsockopt = sock_common_setsockopt, /* ok */
497 .getsockopt = sock_common_getsockopt, /* ok */
498 .sendmsg = inet_sendmsg, /* ok */
499 .recvmsg = sock_common_recvmsg, /* ok */
500 .mmap = sock_no_mmap,
501 .sendpage = sock_no_sendpage,
504 static struct net_proto_family inet6_family_ops = {
506 .create = inet6_create,
507 .owner = THIS_MODULE,
510 /* Same as inet6_dgram_ops, sans udp_poll. */
511 static struct proto_ops inet6_sockraw_ops = {
513 .owner = THIS_MODULE,
514 .release = inet6_release,
516 .connect = inet_dgram_connect, /* ok */
517 .socketpair = sock_no_socketpair, /* a do nothing */
518 .accept = sock_no_accept, /* a do nothing */
519 .getname = inet6_getname,
520 .poll = datagram_poll, /* ok */
521 .ioctl = inet6_ioctl, /* must change */
522 .listen = sock_no_listen, /* ok */
523 .shutdown = inet_shutdown, /* ok */
524 .setsockopt = sock_common_setsockopt, /* ok */
525 .getsockopt = sock_common_getsockopt, /* ok */
526 .sendmsg = inet_sendmsg, /* ok */
527 .recvmsg = sock_common_recvmsg, /* ok */
528 .mmap = sock_no_mmap,
529 .sendpage = sock_no_sendpage,
532 static struct inet_protosw rawv6_protosw = {
534 .protocol = IPPROTO_IP, /* wild card */
536 .ops = &inet6_sockraw_ops,
537 .capability = CAP_NET_RAW,
538 .no_check = UDP_CSUM_DEFAULT,
539 .flags = INET_PROTOSW_REUSE,
543 inet6_register_protosw(struct inet_protosw *p)
545 struct list_head *lh;
546 struct inet_protosw *answer;
547 int protocol = p->protocol;
548 struct list_head *last_perm;
550 spin_lock_bh(&inetsw6_lock);
552 if (p->type >= SOCK_MAX)
555 /* If we are trying to override a permanent protocol, bail. */
557 last_perm = &inetsw6[p->type];
558 list_for_each(lh, &inetsw6[p->type]) {
559 answer = list_entry(lh, struct inet_protosw, list);
561 /* Check only the non-wild match. */
562 if (INET_PROTOSW_PERMANENT & answer->flags) {
563 if (protocol == answer->protocol)
573 /* Add the new entry after the last permanent entry if any, so that
574 * the new entry does not override a permanent entry when matched with
575 * a wild-card protocol. But it is allowed to override any existing
576 * non-permanent entry. This means that when we remove this entry, the
577 * system automatically returns to the old behavior.
579 list_add_rcu(&p->list, last_perm);
581 spin_unlock_bh(&inetsw6_lock);
585 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
591 "Ignoring attempt to register invalid socket type %d.\n",
597 inet6_unregister_protosw(struct inet_protosw *p)
599 if (INET_PROTOSW_PERMANENT & p->flags) {
601 "Attempt to unregister permanent protocol %d.\n",
604 spin_lock_bh(&inetsw6_lock);
605 list_del_rcu(&p->list);
606 spin_unlock_bh(&inetsw6_lock);
613 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
618 ptr[0] = __alloc_percpu(mibsize, mibalign);
622 ptr[1] = __alloc_percpu(mibsize, mibalign);
636 snmp6_mib_free(void *ptr[2])
644 ptr[0] = ptr[1] = NULL;
647 static int __init init_ipv6_mibs(void)
649 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
650 __alignof__(struct ipstats_mib)) < 0)
652 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
653 __alignof__(struct icmpv6_mib)) < 0)
655 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
656 __alignof__(struct udp_mib)) < 0)
661 snmp6_mib_free((void **)icmpv6_statistics);
663 snmp6_mib_free((void **)ipv6_statistics);
669 static void cleanup_ipv6_mibs(void)
671 snmp6_mib_free((void **)ipv6_statistics);
672 snmp6_mib_free((void **)icmpv6_statistics);
673 snmp6_mib_free((void **)udp_stats_in6);
676 static int __init inet6_init(void)
678 struct sk_buff *dummy_skb;
683 #if 0 /* FIXME --RR */
684 if (!mod_member_present(&__this_module, can_unload))
687 __this_module.can_unload = &ipv6_unload;
691 if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
692 printk(KERN_CRIT "inet6_proto_init: size fault\n");
696 err = proto_register(&tcpv6_prot, 1);
700 err = proto_register(&udpv6_prot, 1);
702 goto out_unregister_tcp_proto;
704 err = proto_register(&rawv6_prot, 1);
706 goto out_unregister_udp_proto;
709 /* Register the socket-side information for inet6_create. */
710 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
713 /* We MUST register RAW sockets before we create the ICMP6,
714 * IGMP6, or NDISC control sockets.
716 inet6_register_protosw(&rawv6_protosw);
718 /* Register the family here so that the init calls below will
719 * be able to create sockets. (?? is this dangerous ??)
721 err = sock_register(&inet6_family_ops);
723 goto out_unregister_raw_proto;
725 /* Initialise ipv6 mibs */
726 err = init_ipv6_mibs();
728 goto out_unregister_sock;
731 * ipngwg API draft makes clear that the correct semantics
732 * for TCP and UDP is to consider one TCP and UDP instance
733 * in a host availiable by both INET and INET6 APIs and
734 * able to communicate via both network protocols.
738 ipv6_sysctl_register();
740 err = icmpv6_init(&inet6_family_ops);
743 err = ndisc_init(&inet6_family_ops);
746 err = igmp6_init(&inet6_family_ops);
749 err = ipv6_netfilter_init();
752 /* Create /proc/foo6 entries. */
753 #ifdef CONFIG_PROC_FS
755 if (raw6_proc_init())
757 if (tcp6_proc_init())
759 if (udp6_proc_init())
761 if (ipv6_misc_proc_init())
762 goto proc_misc6_fail;
765 goto proc_anycast6_fail;
770 ip6_flowlabel_init();
771 err = addrconf_init();
776 /* Init v6 extension headers. */
782 /* Init v6 transport protocols. */
792 ip6_flowlabel_cleanup();
794 #ifdef CONFIG_PROC_FS
799 ipv6_misc_proc_exit();
808 ipv6_netfilter_fini();
817 ipv6_sysctl_unregister();
821 sock_unregister(PF_INET6);
822 out_unregister_raw_proto:
823 proto_unregister(&rawv6_prot);
824 out_unregister_udp_proto:
825 proto_unregister(&udpv6_prot);
826 out_unregister_tcp_proto:
827 proto_unregister(&tcpv6_prot);
830 module_init(inet6_init);
832 static void __exit inet6_exit(void)
834 /* First of all disallow new sockets creation. */
835 sock_unregister(PF_INET6);
836 #ifdef CONFIG_PROC_FS
839 ipv6_misc_proc_exit();
844 /* Cleanup code parts. */
846 ip6_flowlabel_cleanup();
849 ipv6_packet_cleanup();
851 ipv6_netfilter_fini();
855 ipv6_sysctl_unregister();
858 proto_unregister(&rawv6_prot);
859 proto_unregister(&udpv6_prot);
860 proto_unregister(&tcpv6_prot);
862 module_exit(inet6_exit);
864 MODULE_ALIAS_NETPROTO(PF_INET6);