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>
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>
62 #include <asm/uaccess.h>
63 #include <asm/system.h>
65 MODULE_AUTHOR("Cast of dozens");
66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67 MODULE_LICENSE("GPL");
69 /* IPv6 procfs goodies... */
72 extern int raw6_proc_init(void);
73 extern void raw6_proc_exit(void);
74 extern int tcp6_proc_init(void);
75 extern void tcp6_proc_exit(void);
76 extern int udp6_proc_init(void);
77 extern void udp6_proc_exit(void);
78 extern int ipv6_misc_proc_init(void);
79 extern void ipv6_misc_proc_exit(void);
80 extern int ac6_proc_init(void);
81 extern void ac6_proc_exit(void);
82 extern int if6_proc_init(void);
83 extern void if6_proc_exit(void);
86 int sysctl_ipv6_bindv6only;
88 #ifdef INET_REFCNT_DEBUG
89 atomic_t inet6_sock_nr;
90 EXPORT_SYMBOL(inet6_sock_nr);
93 /* The inetsw table contains everything that inet_create needs to
96 static struct list_head inetsw6[SOCK_MAX];
97 static DEFINE_SPINLOCK(inetsw6_lock);
99 static void inet6_sock_destruct(struct sock *sk)
101 inet_sock_destruct(sk);
103 #ifdef INET_REFCNT_DEBUG
104 atomic_dec(&inet6_sock_nr);
108 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
110 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
112 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
115 static int inet6_create(struct socket *sock, int protocol)
117 struct inet_sock *inet;
118 struct ipv6_pinfo *np;
121 struct inet_protosw *answer;
122 struct proto *answer_prot;
123 unsigned char answer_flags;
124 char answer_no_check;
127 /* Look for the requested type/protocol pair. */
130 list_for_each_rcu(p, &inetsw6[sock->type]) {
131 answer = list_entry(p, struct inet_protosw, list);
133 /* Check the non-wild match. */
134 if (protocol == answer->protocol) {
135 if (protocol != IPPROTO_IP)
138 /* Check for the two wild cases. */
139 if (IPPROTO_IP == protocol) {
140 protocol = answer->protocol;
143 if (IPPROTO_IP == answer->protocol)
149 rc = -ESOCKTNOSUPPORT;
153 if (answer->capability > 0 && !capable(answer->capability))
155 rc = -EPROTONOSUPPORT;
159 sock->ops = answer->ops;
161 answer_prot = answer->prot;
162 answer_no_check = answer->no_check;
163 answer_flags = answer->flags;
166 BUG_TRAP(answer_prot->slab != NULL);
169 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
173 sock_init_data(sock, sk);
176 sk->sk_no_check = answer_no_check;
177 if (INET_PROTOSW_REUSE & answer_flags)
182 if (SOCK_RAW == sock->type) {
183 inet->num = protocol;
184 if (IPPROTO_RAW == protocol)
188 sk->sk_destruct = inet6_sock_destruct;
189 sk->sk_family = PF_INET6;
190 sk->sk_protocol = protocol;
192 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
194 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
198 np->pmtudisc = IPV6_PMTUDISC_WANT;
199 np->ipv6only = sysctl_ipv6_bindv6only;
201 /* Init the ipv4 part of the socket since we can have sockets
202 * using v6 API for ipv4.
209 inet->mc_list = NULL;
211 if (ipv4_config.no_pmtu_disc)
212 inet->pmtudisc = IP_PMTUDISC_DONT;
214 inet->pmtudisc = IP_PMTUDISC_WANT;
217 #ifdef INET_REFCNT_DEBUG
218 atomic_inc(&inet6_sock_nr);
219 atomic_inc(&inet_sock_nr);
222 /* It assumes that any protocol which allows
223 * the user to assign a number at socket
224 * creation time automatically shares.
226 inet->sport = ntohs(inet->num);
227 sk->sk_prot->hash(sk);
229 if (sk->sk_prot->init) {
230 rc = sk->sk_prot->init(sk);
232 sk_common_release(sk);
244 /* bind for INET6 API */
245 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
247 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
248 struct sock *sk = sock->sk;
249 struct inet_sock *inet = inet_sk(sk);
250 struct ipv6_pinfo *np = inet6_sk(sk);
256 /* If the socket has its own bind function then use it. */
257 if (sk->sk_prot->bind)
258 return sk->sk_prot->bind(sk, uaddr, addr_len);
260 if (addr_len < SIN6_LEN_RFC2133)
262 addr_type = ipv6_addr_type(&addr->sin6_addr);
263 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
266 snum = ntohs(addr->sin6_port);
267 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
272 /* Check these errors (active socket, double bind). */
273 if (sk->sk_state != TCP_CLOSE || inet->num) {
278 /* Check if the address belongs to the host. */
279 if (addr_type == IPV6_ADDR_MAPPED) {
280 v4addr = addr->sin6_addr.s6_addr32[3];
281 if (inet_addr_type(v4addr) != RTN_LOCAL) {
282 err = -EADDRNOTAVAIL;
286 if (addr_type != IPV6_ADDR_ANY) {
287 struct net_device *dev = NULL;
289 if (addr_type & IPV6_ADDR_LINKLOCAL) {
290 if (addr_len >= sizeof(struct sockaddr_in6) &&
291 addr->sin6_scope_id) {
292 /* Override any existing binding, if another one
293 * is supplied by user.
295 sk->sk_bound_dev_if = addr->sin6_scope_id;
298 /* Binding to link-local address requires an interface */
299 if (!sk->sk_bound_dev_if) {
303 dev = dev_get_by_index(sk->sk_bound_dev_if);
310 /* ipv4 addr of the socket is invalid. Only the
311 * unspecified and mapped address have a v4 equivalent.
313 v4addr = LOOPBACK4_IPV6;
314 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
315 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
318 err = -EADDRNOTAVAIL;
327 inet->rcv_saddr = v4addr;
328 inet->saddr = v4addr;
330 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
332 if (!(addr_type & IPV6_ADDR_MULTICAST))
333 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
335 /* Make sure we are allowed to bind here. */
336 if (sk->sk_prot->get_port(sk, snum)) {
337 inet_reset_saddr(sk);
342 if (addr_type != IPV6_ADDR_ANY)
343 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
345 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
346 inet->sport = ntohs(inet->num);
354 int inet6_release(struct socket *sock)
356 struct sock *sk = sock->sk;
362 ipv6_sock_mc_close(sk);
365 ipv6_sock_ac_close(sk);
367 return inet_release(sock);
370 int inet6_destroy_sock(struct sock *sk)
372 struct ipv6_pinfo *np = inet6_sk(sk);
374 struct ipv6_txoptions *opt;
377 * Release destination entry
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);
399 * This does both peername and sockname.
402 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
403 int *uaddr_len, int peer)
405 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
406 struct sock *sk = sock->sk;
407 struct inet_sock *inet = inet_sk(sk);
408 struct ipv6_pinfo *np = inet6_sk(sk);
410 sin->sin6_family = AF_INET6;
411 sin->sin6_flowinfo = 0;
412 sin->sin6_scope_id = 0;
416 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
419 sin->sin6_port = inet->dport;
420 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
422 sin->sin6_flowinfo = np->flow_label;
424 if (ipv6_addr_any(&np->rcv_saddr))
425 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
427 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
429 sin->sin6_port = inet->sport;
431 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
432 sin->sin6_scope_id = sk->sk_bound_dev_if;
433 *uaddr_len = sizeof(*sin);
437 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
439 struct sock *sk = sock->sk;
445 return sock_get_timestamp(sk, (struct timeval __user *)arg);
450 return(ipv6_route_ioctl(cmd,(void __user *)arg));
453 return addrconf_add_ifaddr((void __user *) arg);
455 return addrconf_del_ifaddr((void __user *) arg);
457 return addrconf_set_dstaddr((void __user *) arg);
459 if (!sk->sk_prot->ioctl ||
460 (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
461 return(dev_ioctl(cmd,(void __user *) arg));
468 struct proto_ops inet6_stream_ops = {
470 .owner = THIS_MODULE,
471 .release = inet6_release,
473 .connect = inet_stream_connect, /* ok */
474 .socketpair = sock_no_socketpair, /* a do nothing */
475 .accept = inet_accept, /* ok */
476 .getname = inet6_getname,
477 .poll = tcp_poll, /* ok */
478 .ioctl = inet6_ioctl, /* must change */
479 .listen = inet_listen, /* ok */
480 .shutdown = inet_shutdown, /* ok */
481 .setsockopt = sock_common_setsockopt, /* ok */
482 .getsockopt = sock_common_getsockopt, /* ok */
483 .sendmsg = inet_sendmsg, /* ok */
484 .recvmsg = sock_common_recvmsg, /* ok */
485 .mmap = sock_no_mmap,
486 .sendpage = tcp_sendpage
489 struct proto_ops inet6_dgram_ops = {
491 .owner = THIS_MODULE,
492 .release = inet6_release,
494 .connect = inet_dgram_connect, /* ok */
495 .socketpair = sock_no_socketpair, /* a do nothing */
496 .accept = sock_no_accept, /* a do nothing */
497 .getname = inet6_getname,
498 .poll = udp_poll, /* ok */
499 .ioctl = inet6_ioctl, /* must change */
500 .listen = sock_no_listen, /* ok */
501 .shutdown = inet_shutdown, /* ok */
502 .setsockopt = sock_common_setsockopt, /* ok */
503 .getsockopt = sock_common_getsockopt, /* ok */
504 .sendmsg = inet_sendmsg, /* ok */
505 .recvmsg = sock_common_recvmsg, /* ok */
506 .mmap = sock_no_mmap,
507 .sendpage = sock_no_sendpage,
510 static struct net_proto_family inet6_family_ops = {
512 .create = inet6_create,
513 .owner = THIS_MODULE,
517 extern void ipv6_sysctl_register(void);
518 extern void ipv6_sysctl_unregister(void);
521 /* Same as inet6_dgram_ops, sans udp_poll. */
522 static struct proto_ops inet6_sockraw_ops = {
524 .owner = THIS_MODULE,
525 .release = inet6_release,
527 .connect = inet_dgram_connect, /* ok */
528 .socketpair = sock_no_socketpair, /* a do nothing */
529 .accept = sock_no_accept, /* a do nothing */
530 .getname = inet6_getname,
531 .poll = datagram_poll, /* ok */
532 .ioctl = inet6_ioctl, /* must change */
533 .listen = sock_no_listen, /* ok */
534 .shutdown = inet_shutdown, /* ok */
535 .setsockopt = sock_common_setsockopt, /* ok */
536 .getsockopt = sock_common_getsockopt, /* ok */
537 .sendmsg = inet_sendmsg, /* ok */
538 .recvmsg = sock_common_recvmsg, /* ok */
539 .mmap = sock_no_mmap,
540 .sendpage = sock_no_sendpage,
543 static struct inet_protosw rawv6_protosw = {
545 .protocol = IPPROTO_IP, /* wild card */
547 .ops = &inet6_sockraw_ops,
548 .capability = CAP_NET_RAW,
549 .no_check = UDP_CSUM_DEFAULT,
550 .flags = INET_PROTOSW_REUSE,
554 inet6_register_protosw(struct inet_protosw *p)
556 struct list_head *lh;
557 struct inet_protosw *answer;
558 int protocol = p->protocol;
559 struct list_head *last_perm;
561 spin_lock_bh(&inetsw6_lock);
563 if (p->type >= SOCK_MAX)
566 /* If we are trying to override a permanent protocol, bail. */
568 last_perm = &inetsw6[p->type];
569 list_for_each(lh, &inetsw6[p->type]) {
570 answer = list_entry(lh, struct inet_protosw, list);
572 /* Check only the non-wild match. */
573 if (INET_PROTOSW_PERMANENT & answer->flags) {
574 if (protocol == answer->protocol)
584 /* Add the new entry after the last permanent entry if any, so that
585 * the new entry does not override a permanent entry when matched with
586 * a wild-card protocol. But it is allowed to override any existing
587 * non-permanent entry. This means that when we remove this entry, the
588 * system automatically returns to the old behavior.
590 list_add_rcu(&p->list, last_perm);
592 spin_unlock_bh(&inetsw6_lock);
596 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
602 "Ignoring attempt to register invalid socket type %d.\n",
608 inet6_unregister_protosw(struct inet_protosw *p)
610 if (INET_PROTOSW_PERMANENT & p->flags) {
612 "Attempt to unregister permanent protocol %d.\n",
615 spin_lock_bh(&inetsw6_lock);
616 list_del_rcu(&p->list);
617 spin_unlock_bh(&inetsw6_lock);
624 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
629 ptr[0] = __alloc_percpu(mibsize, mibalign);
633 ptr[1] = __alloc_percpu(mibsize, mibalign);
647 snmp6_mib_free(void *ptr[2])
655 ptr[0] = ptr[1] = NULL;
658 static int __init init_ipv6_mibs(void)
660 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
661 __alignof__(struct ipstats_mib)) < 0)
663 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
664 __alignof__(struct icmpv6_mib)) < 0)
666 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
667 __alignof__(struct udp_mib)) < 0)
672 snmp6_mib_free((void **)icmpv6_statistics);
674 snmp6_mib_free((void **)ipv6_statistics);
680 static void cleanup_ipv6_mibs(void)
682 snmp6_mib_free((void **)ipv6_statistics);
683 snmp6_mib_free((void **)icmpv6_statistics);
684 snmp6_mib_free((void **)udp_stats_in6);
687 extern int ipv6_misc_proc_init(void);
689 static int __init inet6_init(void)
691 struct sk_buff *dummy_skb;
696 #if 0 /* FIXME --RR */
697 if (!mod_member_present(&__this_module, can_unload))
700 __this_module.can_unload = &ipv6_unload;
704 if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
705 printk(KERN_CRIT "inet6_proto_init: size fault\n");
709 err = proto_register(&tcpv6_prot, 1);
713 err = proto_register(&udpv6_prot, 1);
715 goto out_unregister_tcp_proto;
717 err = proto_register(&rawv6_prot, 1);
719 goto out_unregister_udp_proto;
722 /* Register the socket-side information for inet6_create. */
723 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
726 /* We MUST register RAW sockets before we create the ICMP6,
727 * IGMP6, or NDISC control sockets.
729 inet6_register_protosw(&rawv6_protosw);
731 /* Register the family here so that the init calls below will
732 * be able to create sockets. (?? is this dangerous ??)
734 (void) sock_register(&inet6_family_ops);
736 /* Initialise ipv6 mibs */
737 err = init_ipv6_mibs();
739 goto out_unregister_raw_proto;
742 * ipngwg API draft makes clear that the correct semantics
743 * for TCP and UDP is to consider one TCP and UDP instance
744 * in a host availiable by both INET and INET6 APIs and
745 * able to communicate via both network protocols.
749 ipv6_sysctl_register();
751 err = icmpv6_init(&inet6_family_ops);
754 err = ndisc_init(&inet6_family_ops);
757 err = igmp6_init(&inet6_family_ops);
760 /* Create /proc/foo6 entries. */
761 #ifdef CONFIG_PROC_FS
763 if (raw6_proc_init())
765 if (tcp6_proc_init())
767 if (udp6_proc_init())
769 if (ipv6_misc_proc_init())
770 goto proc_misc6_fail;
773 goto proc_anycast6_fail;
779 ip6_flowlabel_init();
780 err = addrconf_init();
785 /* Init v6 extension headers. */
791 /* Init v6 transport protocols. */
799 ip6_flowlabel_cleanup();
801 ipv6_packet_cleanup();
802 #ifdef CONFIG_PROC_FS
807 ipv6_misc_proc_exit();
823 ipv6_sysctl_unregister();
826 out_unregister_raw_proto:
827 proto_unregister(&rawv6_prot);
828 out_unregister_udp_proto:
829 proto_unregister(&udpv6_prot);
830 out_unregister_tcp_proto:
831 proto_unregister(&tcpv6_prot);
834 module_init(inet6_init);
836 static void __exit inet6_exit(void)
838 /* First of all disallow new sockets creation. */
839 sock_unregister(PF_INET6);
840 #ifdef CONFIG_PROC_FS
843 ipv6_misc_proc_exit();
848 /* Cleanup code parts. */
850 ip6_flowlabel_cleanup();
853 ipv6_packet_cleanup();
858 ipv6_sysctl_unregister();
861 proto_unregister(&rawv6_prot);
862 proto_unregister(&udpv6_prot);
863 proto_unregister(&tcpv6_prot);
865 module_exit(inet6_exit);
867 MODULE_ALIAS_NETPROTO(PF_INET6);