xref: /openbmc/linux/net/ipv6/af_inet6.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1 /*
2  *	PF_INET6 socket protocol family
3  *	Linux INET6 implementation
4  *
5  *	Authors:
6  *	Pedro Roque		<roque@di.fc.ul.pt>
7  *
8  *	Adapted from linux/net/ipv4/af_inet.c
9  *
10  *	$Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
11  *
12  * 	Fixes:
13  *	piggy, Karl Knutson	:	Socket protocol table
14  * 	Hideaki YOSHIFUJI	:	sin6_scope_id support
15  * 	Arnaldo Melo		: 	check proc_net_create return, cleanups
16  *
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.
21  */
22 
23 
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>
29 #include <linux/in.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>
37 #include <linux/mm.h>
38 #include <linux/interrupt.h>
39 #include <linux/proc_fs.h>
40 #include <linux/stat.h>
41 #include <linux/init.h>
42 
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>
48 
49 #include <net/ip.h>
50 #include <net/ipv6.h>
51 #include <net/udp.h>
52 #include <net/tcp.h>
53 #include <net/ipip.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>
61 #endif
62 
63 #include <asm/uaccess.h>
64 #include <asm/system.h>
65 
66 MODULE_AUTHOR("Cast of dozens");
67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
68 MODULE_LICENSE("GPL");
69 
70 int sysctl_ipv6_bindv6only;
71 
72 /* The inetsw table contains everything that inet_create needs to
73  * build a new socket.
74  */
75 static struct list_head inetsw6[SOCK_MAX];
76 static DEFINE_SPINLOCK(inetsw6_lock);
77 
78 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
79 {
80 	const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
81 
82 	return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
83 }
84 
85 static int inet6_create(struct socket *sock, int protocol)
86 {
87 	struct inet_sock *inet;
88 	struct ipv6_pinfo *np;
89 	struct sock *sk;
90 	struct list_head *p;
91 	struct inet_protosw *answer;
92 	struct proto *answer_prot;
93 	unsigned char answer_flags;
94 	char answer_no_check;
95 	int rc;
96 
97 	/* Look for the requested type/protocol pair. */
98 	answer = NULL;
99 	rcu_read_lock();
100 	list_for_each_rcu(p, &inetsw6[sock->type]) {
101 		answer = list_entry(p, struct inet_protosw, list);
102 
103 		/* Check the non-wild match. */
104 		if (protocol == answer->protocol) {
105 			if (protocol != IPPROTO_IP)
106 				break;
107 		} else {
108 			/* Check for the two wild cases. */
109 			if (IPPROTO_IP == protocol) {
110 				protocol = answer->protocol;
111 				break;
112 			}
113 			if (IPPROTO_IP == answer->protocol)
114 				break;
115 		}
116 		answer = NULL;
117 	}
118 
119 	rc = -ESOCKTNOSUPPORT;
120 	if (!answer)
121 		goto out_rcu_unlock;
122 	rc = -EPERM;
123 	if (answer->capability > 0 && !capable(answer->capability))
124 		goto out_rcu_unlock;
125 	rc = -EPROTONOSUPPORT;
126 	if (!protocol)
127 		goto out_rcu_unlock;
128 
129 	sock->ops = answer->ops;
130 
131 	answer_prot = answer->prot;
132 	answer_no_check = answer->no_check;
133 	answer_flags = answer->flags;
134 	rcu_read_unlock();
135 
136 	BUG_TRAP(answer_prot->slab != NULL);
137 
138 	rc = -ENOBUFS;
139 	sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
140 	if (sk == NULL)
141 		goto out;
142 
143 	sock_init_data(sock, sk);
144 
145 	rc = 0;
146 	sk->sk_no_check = answer_no_check;
147 	if (INET_PROTOSW_REUSE & answer_flags)
148 		sk->sk_reuse = 1;
149 
150 	inet = inet_sk(sk);
151 
152 	if (SOCK_RAW == sock->type) {
153 		inet->num = protocol;
154 		if (IPPROTO_RAW == protocol)
155 			inet->hdrincl = 1;
156 	}
157 
158 	sk->sk_destruct		= inet_sock_destruct;
159 	sk->sk_family		= PF_INET6;
160 	sk->sk_protocol		= protocol;
161 
162 	sk->sk_backlog_rcv	= answer->prot->backlog_rcv;
163 
164 	inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
165 	np->hop_limit	= -1;
166 	np->mcast_hops	= -1;
167 	np->mc_loop	= 1;
168 	np->pmtudisc	= IPV6_PMTUDISC_WANT;
169 	np->ipv6only	= sysctl_ipv6_bindv6only;
170 
171 	/* Init the ipv4 part of the socket since we can have sockets
172 	 * using v6 API for ipv4.
173 	 */
174 	inet->uc_ttl	= -1;
175 
176 	inet->mc_loop	= 1;
177 	inet->mc_ttl	= 1;
178 	inet->mc_index	= 0;
179 	inet->mc_list	= NULL;
180 
181 	if (ipv4_config.no_pmtu_disc)
182 		inet->pmtudisc = IP_PMTUDISC_DONT;
183 	else
184 		inet->pmtudisc = IP_PMTUDISC_WANT;
185 	/*
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.
189 	 *
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
193 	 */
194 	sk_refcnt_debug_inc(sk);
195 
196 	if (inet->num) {
197 		/* It assumes that any protocol which allows
198 		 * the user to assign a number at socket
199 		 * creation time automatically shares.
200 		 */
201 		inet->sport = ntohs(inet->num);
202 		sk->sk_prot->hash(sk);
203 	}
204 	if (sk->sk_prot->init) {
205 		rc = sk->sk_prot->init(sk);
206 		if (rc) {
207 			sk_common_release(sk);
208 			goto out;
209 		}
210 	}
211 out:
212 	return rc;
213 out_rcu_unlock:
214 	rcu_read_unlock();
215 	goto out;
216 }
217 
218 
219 /* bind for INET6 API */
220 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
221 {
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);
226 	__u32 v4addr = 0;
227 	unsigned short snum;
228 	int addr_type = 0;
229 	int err = 0;
230 
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);
234 
235 	if (addr_len < SIN6_LEN_RFC2133)
236 		return -EINVAL;
237 	addr_type = ipv6_addr_type(&addr->sin6_addr);
238 	if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
239 		return -EINVAL;
240 
241 	snum = ntohs(addr->sin6_port);
242 	if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
243 		return -EACCES;
244 
245 	lock_sock(sk);
246 
247 	/* Check these errors (active socket, double bind). */
248 	if (sk->sk_state != TCP_CLOSE || inet->num) {
249 		err = -EINVAL;
250 		goto out;
251 	}
252 
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;
258 			goto out;
259 		}
260 	} else {
261 		if (addr_type != IPV6_ADDR_ANY) {
262 			struct net_device *dev = NULL;
263 
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.
269 					 */
270 					sk->sk_bound_dev_if = addr->sin6_scope_id;
271 				}
272 
273 				/* Binding to link-local address requires an interface */
274 				if (!sk->sk_bound_dev_if) {
275 					err = -EINVAL;
276 					goto out;
277 				}
278 				dev = dev_get_by_index(sk->sk_bound_dev_if);
279 				if (!dev) {
280 					err = -ENODEV;
281 					goto out;
282 				}
283 			}
284 
285 			/* ipv4 addr of the socket is invalid.  Only the
286 			 * unspecified and mapped address have a v4 equivalent.
287 			 */
288 			v4addr = LOOPBACK4_IPV6;
289 			if (!(addr_type & IPV6_ADDR_MULTICAST))	{
290 				if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
291 					if (dev)
292 						dev_put(dev);
293 					err = -EADDRNOTAVAIL;
294 					goto out;
295 				}
296 			}
297 			if (dev)
298 				dev_put(dev);
299 		}
300 	}
301 
302 	inet->rcv_saddr = v4addr;
303 	inet->saddr = v4addr;
304 
305 	ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
306 
307 	if (!(addr_type & IPV6_ADDR_MULTICAST))
308 		ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
309 
310 	/* Make sure we are allowed to bind here. */
311 	if (sk->sk_prot->get_port(sk, snum)) {
312 		inet_reset_saddr(sk);
313 		err = -EADDRINUSE;
314 		goto out;
315 	}
316 
317 	if (addr_type != IPV6_ADDR_ANY)
318 		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
319 	if (snum)
320 		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
321 	inet->sport = ntohs(inet->num);
322 	inet->dport = 0;
323 	inet->daddr = 0;
324 out:
325 	release_sock(sk);
326 	return err;
327 }
328 
329 int inet6_release(struct socket *sock)
330 {
331 	struct sock *sk = sock->sk;
332 
333 	if (sk == NULL)
334 		return -EINVAL;
335 
336 	/* Free mc lists */
337 	ipv6_sock_mc_close(sk);
338 
339 	/* Free ac lists */
340 	ipv6_sock_ac_close(sk);
341 
342 	return inet_release(sock);
343 }
344 
345 int inet6_destroy_sock(struct sock *sk)
346 {
347 	struct ipv6_pinfo *np = inet6_sk(sk);
348 	struct sk_buff *skb;
349 	struct ipv6_txoptions *opt;
350 
351 	/*
352 	 *	Release destination entry
353 	 */
354 
355 	sk_dst_reset(sk);
356 
357 	/* Release rx options */
358 
359 	if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
360 		kfree_skb(skb);
361 
362 	/* Free flowlabels */
363 	fl6_free_socklist(sk);
364 
365 	/* Free tx options */
366 
367 	if ((opt = xchg(&np->opt, NULL)) != NULL)
368 		sock_kfree_s(sk, opt, opt->tot_len);
369 
370 	return 0;
371 }
372 
373 /*
374  *	This does both peername and sockname.
375  */
376 
377 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
378 		 int *uaddr_len, int peer)
379 {
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);
384 
385 	sin->sin6_family = AF_INET6;
386 	sin->sin6_flowinfo = 0;
387 	sin->sin6_scope_id = 0;
388 	if (peer) {
389 		if (!inet->dport)
390 			return -ENOTCONN;
391 		if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
392 		    peer == 1)
393 			return -ENOTCONN;
394 		sin->sin6_port = inet->dport;
395 		ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
396 		if (np->sndflow)
397 			sin->sin6_flowinfo = np->flow_label;
398 	} else {
399 		if (ipv6_addr_any(&np->rcv_saddr))
400 			ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
401 		else
402 			ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
403 
404 		sin->sin6_port = inet->sport;
405 	}
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);
409 	return(0);
410 }
411 
412 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
413 {
414 	struct sock *sk = sock->sk;
415 	int err = -EINVAL;
416 
417 	switch(cmd)
418 	{
419 	case SIOCGSTAMP:
420 		return sock_get_timestamp(sk, (struct timeval __user *)arg);
421 
422 	case SIOCADDRT:
423 	case SIOCDELRT:
424 
425 		return(ipv6_route_ioctl(cmd,(void __user *)arg));
426 
427 	case SIOCSIFADDR:
428 		return addrconf_add_ifaddr((void __user *) arg);
429 	case SIOCDIFADDR:
430 		return addrconf_del_ifaddr((void __user *) arg);
431 	case SIOCSIFDSTADDR:
432 		return addrconf_set_dstaddr((void __user *) arg);
433 	default:
434 		if (!sk->sk_prot->ioctl ||
435 		    (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
436 			return(dev_ioctl(cmd,(void __user *) arg));
437 		return err;
438 	}
439 	/*NOTREACHED*/
440 	return(0);
441 }
442 
443 struct proto_ops inet6_stream_ops = {
444 	.family =	PF_INET6,
445 	.owner =	THIS_MODULE,
446 	.release =	inet6_release,
447 	.bind =		inet6_bind,
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
462 };
463 
464 struct proto_ops inet6_dgram_ops = {
465 	.family =	PF_INET6,
466 	.owner =	THIS_MODULE,
467 	.release =	inet6_release,
468 	.bind =		inet6_bind,
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,
483 };
484 
485 static struct net_proto_family inet6_family_ops = {
486 	.family = PF_INET6,
487 	.create = inet6_create,
488 	.owner	= THIS_MODULE,
489 };
490 
491 /* Same as inet6_dgram_ops, sans udp_poll.  */
492 static struct proto_ops inet6_sockraw_ops = {
493 	.family =	PF_INET6,
494 	.owner =	THIS_MODULE,
495 	.release =	inet6_release,
496 	.bind =		inet6_bind,
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,
511 };
512 
513 static struct inet_protosw rawv6_protosw = {
514 	.type		= SOCK_RAW,
515 	.protocol	= IPPROTO_IP,	/* wild card */
516 	.prot		= &rawv6_prot,
517 	.ops		= &inet6_sockraw_ops,
518 	.capability	= CAP_NET_RAW,
519 	.no_check	= UDP_CSUM_DEFAULT,
520 	.flags		= INET_PROTOSW_REUSE,
521 };
522 
523 void
524 inet6_register_protosw(struct inet_protosw *p)
525 {
526 	struct list_head *lh;
527 	struct inet_protosw *answer;
528 	int protocol = p->protocol;
529 	struct list_head *last_perm;
530 
531 	spin_lock_bh(&inetsw6_lock);
532 
533 	if (p->type >= SOCK_MAX)
534 		goto out_illegal;
535 
536 	/* If we are trying to override a permanent protocol, bail. */
537 	answer = NULL;
538 	last_perm = &inetsw6[p->type];
539 	list_for_each(lh, &inetsw6[p->type]) {
540 		answer = list_entry(lh, struct inet_protosw, list);
541 
542 		/* Check only the non-wild match. */
543 		if (INET_PROTOSW_PERMANENT & answer->flags) {
544 			if (protocol == answer->protocol)
545 				break;
546 			last_perm = lh;
547 		}
548 
549 		answer = NULL;
550 	}
551 	if (answer)
552 		goto out_permanent;
553 
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.
559 	 */
560 	list_add_rcu(&p->list, last_perm);
561 out:
562 	spin_unlock_bh(&inetsw6_lock);
563 	return;
564 
565 out_permanent:
566 	printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
567 	       protocol);
568 	goto out;
569 
570 out_illegal:
571 	printk(KERN_ERR
572 	       "Ignoring attempt to register invalid socket type %d.\n",
573 	       p->type);
574 	goto out;
575 }
576 
577 void
578 inet6_unregister_protosw(struct inet_protosw *p)
579 {
580 	if (INET_PROTOSW_PERMANENT & p->flags) {
581 		printk(KERN_ERR
582 		       "Attempt to unregister permanent protocol %d.\n",
583 		       p->protocol);
584 	} else {
585 		spin_lock_bh(&inetsw6_lock);
586 		list_del_rcu(&p->list);
587 		spin_unlock_bh(&inetsw6_lock);
588 
589 		synchronize_net();
590 	}
591 }
592 
593 int
594 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
595 {
596 	if (ptr == NULL)
597 		return -EINVAL;
598 
599 	ptr[0] = __alloc_percpu(mibsize, mibalign);
600 	if (!ptr[0])
601 		goto err0;
602 
603 	ptr[1] = __alloc_percpu(mibsize, mibalign);
604 	if (!ptr[1])
605 		goto err1;
606 
607 	return 0;
608 
609 err1:
610 	free_percpu(ptr[0]);
611 	ptr[0] = NULL;
612 err0:
613 	return -ENOMEM;
614 }
615 
616 void
617 snmp6_mib_free(void *ptr[2])
618 {
619 	if (ptr == NULL)
620 		return;
621 	if (ptr[0])
622 		free_percpu(ptr[0]);
623 	if (ptr[1])
624 		free_percpu(ptr[1]);
625 	ptr[0] = ptr[1] = NULL;
626 }
627 
628 static int __init init_ipv6_mibs(void)
629 {
630 	if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
631 			   __alignof__(struct ipstats_mib)) < 0)
632 		goto err_ip_mib;
633 	if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
634 			   __alignof__(struct icmpv6_mib)) < 0)
635 		goto err_icmp_mib;
636 	if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
637 			   __alignof__(struct udp_mib)) < 0)
638 		goto err_udp_mib;
639 	return 0;
640 
641 err_udp_mib:
642 	snmp6_mib_free((void **)icmpv6_statistics);
643 err_icmp_mib:
644 	snmp6_mib_free((void **)ipv6_statistics);
645 err_ip_mib:
646 	return -ENOMEM;
647 
648 }
649 
650 static void cleanup_ipv6_mibs(void)
651 {
652 	snmp6_mib_free((void **)ipv6_statistics);
653 	snmp6_mib_free((void **)icmpv6_statistics);
654 	snmp6_mib_free((void **)udp_stats_in6);
655 }
656 
657 static int __init inet6_init(void)
658 {
659 	struct sk_buff *dummy_skb;
660         struct list_head *r;
661 	int err;
662 
663 #ifdef MODULE
664 #if 0 /* FIXME --RR */
665 	if (!mod_member_present(&__this_module, can_unload))
666 	  return -EINVAL;
667 
668 	__this_module.can_unload = &ipv6_unload;
669 #endif
670 #endif
671 
672 	if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
673 		printk(KERN_CRIT "inet6_proto_init: size fault\n");
674 		return -EINVAL;
675 	}
676 
677 	err = proto_register(&tcpv6_prot, 1);
678 	if (err)
679 		goto out;
680 
681 	err = proto_register(&udpv6_prot, 1);
682 	if (err)
683 		goto out_unregister_tcp_proto;
684 
685 	err = proto_register(&rawv6_prot, 1);
686 	if (err)
687 		goto out_unregister_udp_proto;
688 
689 
690 	/* Register the socket-side information for inet6_create.  */
691 	for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
692 		INIT_LIST_HEAD(r);
693 
694 	/* We MUST register RAW sockets before we create the ICMP6,
695 	 * IGMP6, or NDISC control sockets.
696 	 */
697 	inet6_register_protosw(&rawv6_protosw);
698 
699 	/* Register the family here so that the init calls below will
700 	 * be able to create sockets. (?? is this dangerous ??)
701 	 */
702 	(void) sock_register(&inet6_family_ops);
703 
704 	/* Initialise ipv6 mibs */
705 	err = init_ipv6_mibs();
706 	if (err)
707 		goto out_unregister_raw_proto;
708 
709 	/*
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.
714 	 */
715 
716 #ifdef CONFIG_SYSCTL
717 	ipv6_sysctl_register();
718 #endif
719 	err = icmpv6_init(&inet6_family_ops);
720 	if (err)
721 		goto icmp_fail;
722 	err = ndisc_init(&inet6_family_ops);
723 	if (err)
724 		goto ndisc_fail;
725 	err = igmp6_init(&inet6_family_ops);
726 	if (err)
727 		goto igmp_fail;
728 	err = ipv6_netfilter_init();
729 	if (err)
730 		goto netfilter_fail;
731 	/* Create /proc/foo6 entries. */
732 #ifdef CONFIG_PROC_FS
733 	err = -ENOMEM;
734 	if (raw6_proc_init())
735 		goto proc_raw6_fail;
736 	if (tcp6_proc_init())
737 		goto proc_tcp6_fail;
738 	if (udp6_proc_init())
739 		goto proc_udp6_fail;
740 	if (ipv6_misc_proc_init())
741 		goto proc_misc6_fail;
742 
743 	if (ac6_proc_init())
744 		goto proc_anycast6_fail;
745 	if (if6_proc_init())
746 		goto proc_if6_fail;
747 #endif
748 	ip6_route_init();
749 	ip6_flowlabel_init();
750 	err = addrconf_init();
751 	if (err)
752 		goto addrconf_fail;
753 	sit_init();
754 
755 	/* Init v6 extension headers. */
756 	ipv6_rthdr_init();
757 	ipv6_frag_init();
758 	ipv6_nodata_init();
759 	ipv6_destopt_init();
760 
761 	/* Init v6 transport protocols. */
762 	udpv6_init();
763 	tcpv6_init();
764 
765 	ipv6_packet_init();
766 	err = 0;
767 out:
768 	return err;
769 
770 addrconf_fail:
771 	ip6_flowlabel_cleanup();
772 	ip6_route_cleanup();
773 #ifdef CONFIG_PROC_FS
774 	if6_proc_exit();
775 proc_if6_fail:
776 	ac6_proc_exit();
777 proc_anycast6_fail:
778 	ipv6_misc_proc_exit();
779 proc_misc6_fail:
780 	udp6_proc_exit();
781 proc_udp6_fail:
782 	tcp6_proc_exit();
783 proc_tcp6_fail:
784 	raw6_proc_exit();
785 proc_raw6_fail:
786 #endif
787 	ipv6_netfilter_fini();
788 netfilter_fail:
789 	igmp6_cleanup();
790 igmp_fail:
791 	ndisc_cleanup();
792 ndisc_fail:
793 	icmpv6_cleanup();
794 icmp_fail:
795 #ifdef CONFIG_SYSCTL
796 	ipv6_sysctl_unregister();
797 #endif
798 	cleanup_ipv6_mibs();
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);
805 	goto out;
806 }
807 module_init(inet6_init);
808 
809 static void __exit inet6_exit(void)
810 {
811 	/* First of all disallow new sockets creation. */
812 	sock_unregister(PF_INET6);
813 #ifdef CONFIG_PROC_FS
814 	if6_proc_exit();
815 	ac6_proc_exit();
816  	ipv6_misc_proc_exit();
817  	udp6_proc_exit();
818  	tcp6_proc_exit();
819  	raw6_proc_exit();
820 #endif
821 	/* Cleanup code parts. */
822 	sit_cleanup();
823 	ip6_flowlabel_cleanup();
824 	addrconf_cleanup();
825 	ip6_route_cleanup();
826 	ipv6_packet_cleanup();
827 	igmp6_cleanup();
828 	ipv6_netfilter_fini();
829 	ndisc_cleanup();
830 	icmpv6_cleanup();
831 #ifdef CONFIG_SYSCTL
832 	ipv6_sysctl_unregister();
833 #endif
834 	cleanup_ipv6_mibs();
835 	proto_unregister(&rawv6_prot);
836 	proto_unregister(&udpv6_prot);
837 	proto_unregister(&tcpv6_prot);
838 }
839 module_exit(inet6_exit);
840 
841 MODULE_ALIAS_NETPROTO(PF_INET6);
842