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;
97 /* Look for the requested type/protocol pair. */
100 list_for_each_rcu(p, &inetsw6[sock->type]) {
101 answer = list_entry(p, struct inet_protosw, list);
103 /* Check the non-wild match. */
104 if (protocol == answer->protocol) {
105 if (protocol != IPPROTO_IP)
108 /* Check for the two wild cases. */
109 if (IPPROTO_IP == protocol) {
110 protocol = answer->protocol;
113 if (IPPROTO_IP == answer->protocol)
119 rc = -ESOCKTNOSUPPORT;
123 if (answer->capability > 0 && !capable(answer->capability))
125 rc = -EPROTONOSUPPORT;
129 sock->ops = answer->ops;
131 answer_prot = answer->prot;
132 answer_no_check = answer->no_check;
133 answer_flags = answer->flags;
136 BUG_TRAP(answer_prot->slab != NULL);
139 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
143 sock_init_data(sock, sk);
146 sk->sk_no_check = answer_no_check;
147 if (INET_PROTOSW_REUSE & answer_flags)
152 if (SOCK_RAW == sock->type) {
153 inet->num = protocol;
154 if (IPPROTO_RAW == protocol)
158 sk->sk_destruct = inet_sock_destruct;
159 sk->sk_family = PF_INET6;
160 sk->sk_protocol = protocol;
162 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
164 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
168 np->pmtudisc = IPV6_PMTUDISC_WANT;
169 np->ipv6only = sysctl_ipv6_bindv6only;
171 /* Init the ipv4 part of the socket since we can have sockets
172 * using v6 API for ipv4.
179 inet->mc_list = NULL;
181 if (ipv4_config.no_pmtu_disc)
182 inet->pmtudisc = IP_PMTUDISC_DONT;
184 inet->pmtudisc = IP_PMTUDISC_WANT;
186 * Increment only the relevant sk_prot->socks debug field, this changes
187 * the previous behaviour of incrementing both the equivalent to
188 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
190 * This allows better debug granularity as we'll know exactly how many
191 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
192 * transport protocol socks. -acme
194 sk_refcnt_debug_inc(sk);
197 /* It assumes that any protocol which allows
198 * the user to assign a number at socket
199 * creation time automatically shares.
201 inet->sport = ntohs(inet->num);
202 sk->sk_prot->hash(sk);
204 if (sk->sk_prot->init) {
205 rc = sk->sk_prot->init(sk);
207 sk_common_release(sk);
219 /* bind for INET6 API */
220 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
222 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
223 struct sock *sk = sock->sk;
224 struct inet_sock *inet = inet_sk(sk);
225 struct ipv6_pinfo *np = inet6_sk(sk);
231 /* If the socket has its own bind function then use it. */
232 if (sk->sk_prot->bind)
233 return sk->sk_prot->bind(sk, uaddr, addr_len);
235 if (addr_len < SIN6_LEN_RFC2133)
237 addr_type = ipv6_addr_type(&addr->sin6_addr);
238 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
241 snum = ntohs(addr->sin6_port);
242 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
247 /* Check these errors (active socket, double bind). */
248 if (sk->sk_state != TCP_CLOSE || inet->num) {
253 /* Check if the address belongs to the host. */
254 if (addr_type == IPV6_ADDR_MAPPED) {
255 v4addr = addr->sin6_addr.s6_addr32[3];
256 if (inet_addr_type(v4addr) != RTN_LOCAL) {
257 err = -EADDRNOTAVAIL;
261 if (addr_type != IPV6_ADDR_ANY) {
262 struct net_device *dev = NULL;
264 if (addr_type & IPV6_ADDR_LINKLOCAL) {
265 if (addr_len >= sizeof(struct sockaddr_in6) &&
266 addr->sin6_scope_id) {
267 /* Override any existing binding, if another one
268 * is supplied by user.
270 sk->sk_bound_dev_if = addr->sin6_scope_id;
273 /* Binding to link-local address requires an interface */
274 if (!sk->sk_bound_dev_if) {
278 dev = dev_get_by_index(sk->sk_bound_dev_if);
285 /* ipv4 addr of the socket is invalid. Only the
286 * unspecified and mapped address have a v4 equivalent.
288 v4addr = LOOPBACK4_IPV6;
289 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
290 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
293 err = -EADDRNOTAVAIL;
302 inet->rcv_saddr = v4addr;
303 inet->saddr = v4addr;
305 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
307 if (!(addr_type & IPV6_ADDR_MULTICAST))
308 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
310 /* Make sure we are allowed to bind here. */
311 if (sk->sk_prot->get_port(sk, snum)) {
312 inet_reset_saddr(sk);
317 if (addr_type != IPV6_ADDR_ANY)
318 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
320 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
321 inet->sport = ntohs(inet->num);
329 int inet6_release(struct socket *sock)
331 struct sock *sk = sock->sk;
337 ipv6_sock_mc_close(sk);
340 ipv6_sock_ac_close(sk);
342 return inet_release(sock);
345 int inet6_destroy_sock(struct sock *sk)
347 struct ipv6_pinfo *np = inet6_sk(sk);
349 struct ipv6_txoptions *opt;
352 * Release destination entry
357 /* Release rx options */
359 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
362 /* Free flowlabels */
363 fl6_free_socklist(sk);
365 /* Free tx options */
367 if ((opt = xchg(&np->opt, NULL)) != NULL)
368 sock_kfree_s(sk, opt, opt->tot_len);
374 * This does both peername and sockname.
377 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
378 int *uaddr_len, int peer)
380 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
381 struct sock *sk = sock->sk;
382 struct inet_sock *inet = inet_sk(sk);
383 struct ipv6_pinfo *np = inet6_sk(sk);
385 sin->sin6_family = AF_INET6;
386 sin->sin6_flowinfo = 0;
387 sin->sin6_scope_id = 0;
391 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
394 sin->sin6_port = inet->dport;
395 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
397 sin->sin6_flowinfo = np->flow_label;
399 if (ipv6_addr_any(&np->rcv_saddr))
400 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
402 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
404 sin->sin6_port = inet->sport;
406 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
407 sin->sin6_scope_id = sk->sk_bound_dev_if;
408 *uaddr_len = sizeof(*sin);
412 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
414 struct sock *sk = sock->sk;
420 return sock_get_timestamp(sk, (struct timeval __user *)arg);
425 return(ipv6_route_ioctl(cmd,(void __user *)arg));
428 return addrconf_add_ifaddr((void __user *) arg);
430 return addrconf_del_ifaddr((void __user *) arg);
432 return addrconf_set_dstaddr((void __user *) arg);
434 if (!sk->sk_prot->ioctl ||
435 (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
436 return(dev_ioctl(cmd,(void __user *) arg));
443 struct proto_ops inet6_stream_ops = {
445 .owner = THIS_MODULE,
446 .release = inet6_release,
448 .connect = inet_stream_connect, /* ok */
449 .socketpair = sock_no_socketpair, /* a do nothing */
450 .accept = inet_accept, /* ok */
451 .getname = inet6_getname,
452 .poll = tcp_poll, /* ok */
453 .ioctl = inet6_ioctl, /* must change */
454 .listen = inet_listen, /* ok */
455 .shutdown = inet_shutdown, /* ok */
456 .setsockopt = sock_common_setsockopt, /* ok */
457 .getsockopt = sock_common_getsockopt, /* ok */
458 .sendmsg = inet_sendmsg, /* ok */
459 .recvmsg = sock_common_recvmsg, /* ok */
460 .mmap = sock_no_mmap,
461 .sendpage = tcp_sendpage
464 struct proto_ops inet6_dgram_ops = {
466 .owner = THIS_MODULE,
467 .release = inet6_release,
469 .connect = inet_dgram_connect, /* ok */
470 .socketpair = sock_no_socketpair, /* a do nothing */
471 .accept = sock_no_accept, /* a do nothing */
472 .getname = inet6_getname,
473 .poll = udp_poll, /* ok */
474 .ioctl = inet6_ioctl, /* must change */
475 .listen = sock_no_listen, /* ok */
476 .shutdown = inet_shutdown, /* ok */
477 .setsockopt = sock_common_setsockopt, /* ok */
478 .getsockopt = sock_common_getsockopt, /* ok */
479 .sendmsg = inet_sendmsg, /* ok */
480 .recvmsg = sock_common_recvmsg, /* ok */
481 .mmap = sock_no_mmap,
482 .sendpage = sock_no_sendpage,
485 static struct net_proto_family inet6_family_ops = {
487 .create = inet6_create,
488 .owner = THIS_MODULE,
491 /* Same as inet6_dgram_ops, sans udp_poll. */
492 static struct proto_ops inet6_sockraw_ops = {
494 .owner = THIS_MODULE,
495 .release = inet6_release,
497 .connect = inet_dgram_connect, /* ok */
498 .socketpair = sock_no_socketpair, /* a do nothing */
499 .accept = sock_no_accept, /* a do nothing */
500 .getname = inet6_getname,
501 .poll = datagram_poll, /* ok */
502 .ioctl = inet6_ioctl, /* must change */
503 .listen = sock_no_listen, /* ok */
504 .shutdown = inet_shutdown, /* ok */
505 .setsockopt = sock_common_setsockopt, /* ok */
506 .getsockopt = sock_common_getsockopt, /* ok */
507 .sendmsg = inet_sendmsg, /* ok */
508 .recvmsg = sock_common_recvmsg, /* ok */
509 .mmap = sock_no_mmap,
510 .sendpage = sock_no_sendpage,
513 static struct inet_protosw rawv6_protosw = {
515 .protocol = IPPROTO_IP, /* wild card */
517 .ops = &inet6_sockraw_ops,
518 .capability = CAP_NET_RAW,
519 .no_check = UDP_CSUM_DEFAULT,
520 .flags = INET_PROTOSW_REUSE,
524 inet6_register_protosw(struct inet_protosw *p)
526 struct list_head *lh;
527 struct inet_protosw *answer;
528 int protocol = p->protocol;
529 struct list_head *last_perm;
531 spin_lock_bh(&inetsw6_lock);
533 if (p->type >= SOCK_MAX)
536 /* If we are trying to override a permanent protocol, bail. */
538 last_perm = &inetsw6[p->type];
539 list_for_each(lh, &inetsw6[p->type]) {
540 answer = list_entry(lh, struct inet_protosw, list);
542 /* Check only the non-wild match. */
543 if (INET_PROTOSW_PERMANENT & answer->flags) {
544 if (protocol == answer->protocol)
554 /* Add the new entry after the last permanent entry if any, so that
555 * the new entry does not override a permanent entry when matched with
556 * a wild-card protocol. But it is allowed to override any existing
557 * non-permanent entry. This means that when we remove this entry, the
558 * system automatically returns to the old behavior.
560 list_add_rcu(&p->list, last_perm);
562 spin_unlock_bh(&inetsw6_lock);
566 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
572 "Ignoring attempt to register invalid socket type %d.\n",
578 inet6_unregister_protosw(struct inet_protosw *p)
580 if (INET_PROTOSW_PERMANENT & p->flags) {
582 "Attempt to unregister permanent protocol %d.\n",
585 spin_lock_bh(&inetsw6_lock);
586 list_del_rcu(&p->list);
587 spin_unlock_bh(&inetsw6_lock);
594 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
599 ptr[0] = __alloc_percpu(mibsize, mibalign);
603 ptr[1] = __alloc_percpu(mibsize, mibalign);
617 snmp6_mib_free(void *ptr[2])
625 ptr[0] = ptr[1] = NULL;
628 static int __init init_ipv6_mibs(void)
630 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
631 __alignof__(struct ipstats_mib)) < 0)
633 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
634 __alignof__(struct icmpv6_mib)) < 0)
636 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
637 __alignof__(struct udp_mib)) < 0)
642 snmp6_mib_free((void **)icmpv6_statistics);
644 snmp6_mib_free((void **)ipv6_statistics);
650 static void cleanup_ipv6_mibs(void)
652 snmp6_mib_free((void **)ipv6_statistics);
653 snmp6_mib_free((void **)icmpv6_statistics);
654 snmp6_mib_free((void **)udp_stats_in6);
657 static int __init inet6_init(void)
659 struct sk_buff *dummy_skb;
664 #if 0 /* FIXME --RR */
665 if (!mod_member_present(&__this_module, can_unload))
668 __this_module.can_unload = &ipv6_unload;
672 if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
673 printk(KERN_CRIT "inet6_proto_init: size fault\n");
677 err = proto_register(&tcpv6_prot, 1);
681 err = proto_register(&udpv6_prot, 1);
683 goto out_unregister_tcp_proto;
685 err = proto_register(&rawv6_prot, 1);
687 goto out_unregister_udp_proto;
690 /* Register the socket-side information for inet6_create. */
691 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
694 /* We MUST register RAW sockets before we create the ICMP6,
695 * IGMP6, or NDISC control sockets.
697 inet6_register_protosw(&rawv6_protosw);
699 /* Register the family here so that the init calls below will
700 * be able to create sockets. (?? is this dangerous ??)
702 (void) sock_register(&inet6_family_ops);
704 /* Initialise ipv6 mibs */
705 err = init_ipv6_mibs();
707 goto out_unregister_raw_proto;
710 * ipngwg API draft makes clear that the correct semantics
711 * for TCP and UDP is to consider one TCP and UDP instance
712 * in a host availiable by both INET and INET6 APIs and
713 * able to communicate via both network protocols.
717 ipv6_sysctl_register();
719 err = icmpv6_init(&inet6_family_ops);
722 err = ndisc_init(&inet6_family_ops);
725 err = igmp6_init(&inet6_family_ops);
728 err = ipv6_netfilter_init();
731 /* Create /proc/foo6 entries. */
732 #ifdef CONFIG_PROC_FS
734 if (raw6_proc_init())
736 if (tcp6_proc_init())
738 if (udp6_proc_init())
740 if (ipv6_misc_proc_init())
741 goto proc_misc6_fail;
744 goto proc_anycast6_fail;
749 ip6_flowlabel_init();
750 err = addrconf_init();
755 /* Init v6 extension headers. */
761 /* Init v6 transport protocols. */
771 ip6_flowlabel_cleanup();
773 #ifdef CONFIG_PROC_FS
778 ipv6_misc_proc_exit();
787 ipv6_netfilter_fini();
796 ipv6_sysctl_unregister();
799 out_unregister_raw_proto:
800 proto_unregister(&rawv6_prot);
801 out_unregister_udp_proto:
802 proto_unregister(&udpv6_prot);
803 out_unregister_tcp_proto:
804 proto_unregister(&tcpv6_prot);
807 module_init(inet6_init);
809 static void __exit inet6_exit(void)
811 /* First of all disallow new sockets creation. */
812 sock_unregister(PF_INET6);
813 #ifdef CONFIG_PROC_FS
816 ipv6_misc_proc_exit();
821 /* Cleanup code parts. */
823 ip6_flowlabel_cleanup();
826 ipv6_packet_cleanup();
828 ipv6_netfilter_fini();
832 ipv6_sysctl_unregister();
835 proto_unregister(&rawv6_prot);
836 proto_unregister(&udpv6_prot);
837 proto_unregister(&tcpv6_prot);
839 module_exit(inet6_exit);
841 MODULE_ALIAS_NETPROTO(PF_INET6);