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/major.h>
32 #include <linux/sched.h>
33 #include <linux/timer.h>
34 #include <linux/string.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/fcntl.h>
39 #include <linux/interrupt.h>
40 #include <linux/proc_fs.h>
41 #include <linux/stat.h>
42 #include <linux/init.h>
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <linux/icmpv6.h>
47 #include <linux/smp_lock.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 /* IPv6 procfs goodies... */
73 extern int raw6_proc_init(void);
74 extern void raw6_proc_exit(void);
75 extern int tcp6_proc_init(void);
76 extern void tcp6_proc_exit(void);
77 extern int udp6_proc_init(void);
78 extern void udp6_proc_exit(void);
79 extern int ipv6_misc_proc_init(void);
80 extern void ipv6_misc_proc_exit(void);
81 extern int ac6_proc_init(void);
82 extern void ac6_proc_exit(void);
83 extern int if6_proc_init(void);
84 extern void if6_proc_exit(void);
87 int sysctl_ipv6_bindv6only;
89 #ifdef INET_REFCNT_DEBUG
90 atomic_t inet6_sock_nr;
93 /* The inetsw table contains everything that inet_create needs to
96 static struct list_head inetsw6[SOCK_MAX];
97 static spinlock_t inetsw6_lock = SPIN_LOCK_UNLOCKED;
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->slab_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_opt *inet;
118 struct ipv6_pinfo *np;
120 struct tcp6_sock* tcp6sk;
122 struct inet_protosw *answer;
123 struct proto *answer_prot;
124 unsigned char answer_flags;
125 char answer_no_check;
128 /* Look for the requested type/protocol pair. */
131 list_for_each_rcu(p, &inetsw6[sock->type]) {
132 answer = list_entry(p, struct inet_protosw, list);
134 /* Check the non-wild match. */
135 if (protocol == answer->protocol) {
136 if (protocol != IPPROTO_IP)
139 /* Check for the two wild cases. */
140 if (IPPROTO_IP == protocol) {
141 protocol = answer->protocol;
144 if (IPPROTO_IP == answer->protocol)
150 rc = -ESOCKTNOSUPPORT;
154 if (answer->capability > 0 && !capable(answer->capability))
156 rc = -EPROTONOSUPPORT;
160 sock->ops = answer->ops;
162 answer_prot = answer->prot;
163 answer_no_check = answer->no_check;
164 answer_flags = answer->flags;
167 BUG_TRAP(answer_prot->slab != NULL);
170 sk = sk_alloc(PF_INET6, GFP_KERNEL,
171 answer_prot->slab_obj_size,
176 sock_init_data(sock, sk);
177 sk_set_owner(sk, THIS_MODULE);
180 sk->sk_prot = answer_prot;
181 sk->sk_no_check = answer_no_check;
182 if (INET_PROTOSW_REUSE & answer_flags)
187 if (SOCK_RAW == sock->type) {
188 inet->num = protocol;
189 if (IPPROTO_RAW == protocol)
193 sk->sk_destruct = inet6_sock_destruct;
194 sk->sk_family = PF_INET6;
195 sk->sk_protocol = protocol;
197 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
199 tcp6sk = (struct tcp6_sock *)sk;
200 tcp6sk->pinet6 = np = inet6_sk_generic(sk);
204 np->pmtudisc = IPV6_PMTUDISC_WANT;
205 np->ipv6only = sysctl_ipv6_bindv6only;
207 /* Init the ipv4 part of the socket since we can have sockets
208 * using v6 API for ipv4.
215 inet->mc_list = NULL;
217 if (ipv4_config.no_pmtu_disc)
218 inet->pmtudisc = IP_PMTUDISC_DONT;
220 inet->pmtudisc = IP_PMTUDISC_WANT;
223 #ifdef INET_REFCNT_DEBUG
224 atomic_inc(&inet6_sock_nr);
225 atomic_inc(&inet_sock_nr);
228 /* It assumes that any protocol which allows
229 * the user to assign a number at socket
230 * creation time automatically shares.
232 inet->sport = ntohs(inet->num);
233 sk->sk_prot->hash(sk);
235 if (sk->sk_prot->init) {
236 rc = sk->sk_prot->init(sk);
238 sk_common_release(sk);
250 /* bind for INET6 API */
251 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
253 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
254 struct sock *sk = sock->sk;
255 struct inet_opt *inet = inet_sk(sk);
256 struct ipv6_pinfo *np = inet6_sk(sk);
262 /* If the socket has its own bind function then use it. */
263 if (sk->sk_prot->bind)
264 return sk->sk_prot->bind(sk, uaddr, addr_len);
266 if (addr_len < SIN6_LEN_RFC2133)
268 addr_type = ipv6_addr_type(&addr->sin6_addr);
269 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
272 snum = ntohs(addr->sin6_port);
273 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
278 /* Check these errors (active socket, double bind). */
279 if (sk->sk_state != TCP_CLOSE || inet->num) {
284 /* Check if the address belongs to the host. */
285 if (addr_type == IPV6_ADDR_MAPPED) {
286 v4addr = addr->sin6_addr.s6_addr32[3];
287 if (inet_addr_type(v4addr) != RTN_LOCAL) {
288 err = -EADDRNOTAVAIL;
292 if (addr_type != IPV6_ADDR_ANY) {
293 struct net_device *dev = NULL;
295 if (addr_type & IPV6_ADDR_LINKLOCAL) {
296 if (addr_len >= sizeof(struct sockaddr_in6) &&
297 addr->sin6_scope_id) {
298 /* Override any existing binding, if another one
299 * is supplied by user.
301 sk->sk_bound_dev_if = addr->sin6_scope_id;
304 /* Binding to link-local address requires an interface */
305 if (!sk->sk_bound_dev_if) {
309 dev = dev_get_by_index(sk->sk_bound_dev_if);
316 /* ipv4 addr of the socket is invalid. Only the
317 * unspecified and mapped address have a v4 equivalent.
319 v4addr = LOOPBACK4_IPV6;
320 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
321 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
324 err = -EADDRNOTAVAIL;
333 inet->rcv_saddr = v4addr;
334 inet->saddr = v4addr;
336 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
338 if (!(addr_type & IPV6_ADDR_MULTICAST))
339 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
341 /* Make sure we are allowed to bind here. */
342 if (sk->sk_prot->get_port(sk, snum)) {
343 inet_reset_saddr(sk);
348 if (addr_type != IPV6_ADDR_ANY)
349 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
351 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
352 inet->sport = ntohs(inet->num);
360 int inet6_release(struct socket *sock)
362 struct sock *sk = sock->sk;
368 ipv6_sock_mc_close(sk);
371 ipv6_sock_ac_close(sk);
373 return inet_release(sock);
376 int inet6_destroy_sock(struct sock *sk)
378 struct ipv6_pinfo *np = inet6_sk(sk);
380 struct ipv6_txoptions *opt;
383 * Release destination entry
388 /* Release rx options */
390 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
393 /* Free flowlabels */
394 fl6_free_socklist(sk);
396 /* Free tx options */
398 if ((opt = xchg(&np->opt, NULL)) != NULL)
399 sock_kfree_s(sk, opt, opt->tot_len);
405 * This does both peername and sockname.
408 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
409 int *uaddr_len, int peer)
411 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
412 struct sock *sk = sock->sk;
413 struct inet_opt *inet = inet_sk(sk);
414 struct ipv6_pinfo *np = inet6_sk(sk);
416 sin->sin6_family = AF_INET6;
417 sin->sin6_flowinfo = 0;
418 sin->sin6_scope_id = 0;
422 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
425 sin->sin6_port = inet->dport;
426 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
428 sin->sin6_flowinfo = np->flow_label;
430 if (ipv6_addr_any(&np->rcv_saddr))
431 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
433 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
435 sin->sin6_port = inet->sport;
437 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
438 sin->sin6_scope_id = sk->sk_bound_dev_if;
439 *uaddr_len = sizeof(*sin);
443 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
445 struct sock *sk = sock->sk;
451 return sock_get_timestamp(sk, (struct timeval __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 ||
466 (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
467 return(dev_ioctl(cmd,(void __user *) arg));
474 struct proto_ops inet6_stream_ops = {
476 .owner = THIS_MODULE,
477 .release = inet6_release,
479 .connect = inet_stream_connect, /* ok */
480 .socketpair = sock_no_socketpair, /* a do nothing */
481 .accept = inet_accept, /* ok */
482 .getname = inet6_getname,
483 .poll = tcp_poll, /* ok */
484 .ioctl = inet6_ioctl, /* must change */
485 .listen = inet_listen, /* ok */
486 .shutdown = inet_shutdown, /* ok */
487 .setsockopt = sock_common_setsockopt, /* ok */
488 .getsockopt = sock_common_getsockopt, /* ok */
489 .sendmsg = inet_sendmsg, /* ok */
490 .recvmsg = sock_common_recvmsg, /* ok */
491 .mmap = sock_no_mmap,
492 .sendpage = tcp_sendpage
495 struct proto_ops inet6_dgram_ops = {
497 .owner = THIS_MODULE,
498 .release = inet6_release,
500 .connect = inet_dgram_connect, /* ok */
501 .socketpair = sock_no_socketpair, /* a do nothing */
502 .accept = sock_no_accept, /* a do nothing */
503 .getname = inet6_getname,
504 .poll = datagram_poll, /* ok */
505 .ioctl = inet6_ioctl, /* must change */
506 .listen = sock_no_listen, /* ok */
507 .shutdown = inet_shutdown, /* ok */
508 .setsockopt = sock_common_setsockopt, /* ok */
509 .getsockopt = sock_common_getsockopt, /* ok */
510 .sendmsg = inet_sendmsg, /* ok */
511 .recvmsg = sock_common_recvmsg, /* ok */
512 .mmap = sock_no_mmap,
513 .sendpage = sock_no_sendpage,
516 static struct net_proto_family inet6_family_ops = {
518 .create = inet6_create,
519 .owner = THIS_MODULE,
523 extern void ipv6_sysctl_register(void);
524 extern void ipv6_sysctl_unregister(void);
527 static struct inet_protosw rawv6_protosw = {
529 .protocol = IPPROTO_IP, /* wild card */
531 .ops = &inet6_dgram_ops,
532 .capability = CAP_NET_RAW,
533 .no_check = UDP_CSUM_DEFAULT,
534 .flags = INET_PROTOSW_REUSE,
538 inet6_register_protosw(struct inet_protosw *p)
540 struct list_head *lh;
541 struct inet_protosw *answer;
542 int protocol = p->protocol;
543 struct list_head *last_perm;
545 spin_lock_bh(&inetsw6_lock);
547 if (p->type >= SOCK_MAX)
550 /* If we are trying to override a permanent protocol, bail. */
552 last_perm = &inetsw6[p->type];
553 list_for_each(lh, &inetsw6[p->type]) {
554 answer = list_entry(lh, struct inet_protosw, list);
556 /* Check only the non-wild match. */
557 if (INET_PROTOSW_PERMANENT & answer->flags) {
558 if (protocol == answer->protocol)
568 /* Add the new entry after the last permanent entry if any, so that
569 * the new entry does not override a permanent entry when matched with
570 * a wild-card protocol. But it is allowed to override any existing
571 * non-permanent entry. This means that when we remove this entry, the
572 * system automatically returns to the old behavior.
574 list_add_rcu(&p->list, last_perm);
576 spin_unlock_bh(&inetsw6_lock);
580 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
586 "Ignoring attempt to register invalid socket type %d.\n",
592 inet6_unregister_protosw(struct inet_protosw *p)
594 if (INET_PROTOSW_PERMANENT & p->flags) {
596 "Attempt to unregister permanent protocol %d.\n",
599 spin_lock_bh(&inetsw6_lock);
600 list_del_rcu(&p->list);
601 spin_unlock_bh(&inetsw6_lock);
608 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
613 ptr[0] = __alloc_percpu(mibsize, mibalign);
617 ptr[1] = __alloc_percpu(mibsize, mibalign);
631 snmp6_mib_free(void *ptr[2])
637 ptr[0] = ptr[1] = NULL;
640 static int __init init_ipv6_mibs(void)
642 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
643 __alignof__(struct ipstats_mib)) < 0)
645 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
646 __alignof__(struct icmpv6_mib)) < 0)
648 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
649 __alignof__(struct udp_mib)) < 0)
654 snmp6_mib_free((void **)icmpv6_statistics);
656 snmp6_mib_free((void **)ipv6_statistics);
662 static void cleanup_ipv6_mibs(void)
664 snmp6_mib_free((void **)ipv6_statistics);
665 snmp6_mib_free((void **)icmpv6_statistics);
666 snmp6_mib_free((void **)udp_stats_in6);
669 extern int ipv6_misc_proc_init(void);
671 static int __init inet6_init(void)
673 struct sk_buff *dummy_skb;
678 #if 0 /* FIXME --RR */
679 if (!mod_member_present(&__this_module, can_unload))
682 __this_module.can_unload = &ipv6_unload;
686 if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
687 printk(KERN_CRIT "inet6_proto_init: size fault\n");
691 err = sk_alloc_slab(&tcpv6_prot, "tcpv6_sock");
693 sk_alloc_slab_error(&tcpv6_prot);
696 err = sk_alloc_slab(&udpv6_prot, "udpv6_sock");
698 sk_alloc_slab_error(&udpv6_prot);
699 goto out_tcp_free_slab;
701 err = sk_alloc_slab(&rawv6_prot, "rawv6_sock");
703 sk_alloc_slab_error(&rawv6_prot);
704 goto out_udp_free_slab;
707 /* Register the socket-side information for inet6_create. */
708 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
711 /* We MUST register RAW sockets before we create the ICMP6,
712 * IGMP6, or NDISC control sockets.
714 inet6_register_protosw(&rawv6_protosw);
716 /* Register the family here so that the init calls below will
717 * be able to create sockets. (?? is this dangerous ??)
719 (void) sock_register(&inet6_family_ops);
721 /* Initialise ipv6 mibs */
722 err = init_ipv6_mibs();
724 goto out_raw_free_slab;
727 * ipngwg API draft makes clear that the correct semantics
728 * for TCP and UDP is to consider one TCP and UDP instance
729 * in a host availiable by both INET and INET6 APIs and
730 * able to communicate via both network protocols.
734 ipv6_sysctl_register();
736 err = icmpv6_init(&inet6_family_ops);
739 err = ndisc_init(&inet6_family_ops);
742 err = igmp6_init(&inet6_family_ops);
745 /* Create /proc/foo6 entries. */
746 #ifdef CONFIG_PROC_FS
748 if (raw6_proc_init())
750 if (tcp6_proc_init())
752 if (udp6_proc_init())
754 if (ipv6_misc_proc_init())
755 goto proc_misc6_fail;
758 goto proc_anycast6_fail;
764 ip6_flowlabel_init();
768 /* Init v6 extension headers. */
774 /* Init v6 transport protocols. */
781 #ifdef CONFIG_PROC_FS
785 ipv6_misc_proc_exit();
801 ipv6_sysctl_unregister();
805 sk_free_slab(&rawv6_prot);
807 sk_free_slab(&udpv6_prot);
809 sk_free_slab(&tcpv6_prot);
812 module_init(inet6_init);
814 static void __exit inet6_exit(void)
816 /* First of all disallow new sockets creation. */
817 sock_unregister(PF_INET6);
818 #ifdef CONFIG_PROC_FS
821 ipv6_misc_proc_exit();
826 /* Cleanup code parts. */
828 ip6_flowlabel_cleanup();
831 ipv6_packet_cleanup();
836 ipv6_sysctl_unregister();
839 sk_free_slab(&rawv6_prot);
840 sk_free_slab(&udpv6_prot);
841 sk_free_slab(&tcpv6_prot);
843 module_exit(inet6_exit);
845 MODULE_ALIAS_NETPROTO(PF_INET6);