af_inet6.c revision c54419321455631079c7d6e60bc732dd0c5914c5 
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 * 	Fixes:
11 *	piggy, Karl Knutson	:	Socket protocol table
12 * 	Hideaki YOSHIFUJI	:	sin6_scope_id support
13 * 	Arnaldo Melo		: 	check proc_net_create return, cleanups
14 *
15 *	This program is free software; you can redistribute it and/or
16 *      modify it under the terms of the GNU General Public License
17 *      as published by the Free Software Foundation; either version
18 *      2 of the License, or (at your option) any later version.
19 */
20
21#define pr_fmt(fmt) "IPv6: " fmt
22
23#include <linux/module.h>
24#include <linux/capability.h>
25#include <linux/errno.h>
26#include <linux/types.h>
27#include <linux/socket.h>
28#include <linux/in.h>
29#include <linux/kernel.h>
30#include <linux/timer.h>
31#include <linux/string.h>
32#include <linux/sockios.h>
33#include <linux/net.h>
34#include <linux/fcntl.h>
35#include <linux/mm.h>
36#include <linux/interrupt.h>
37#include <linux/proc_fs.h>
38#include <linux/stat.h>
39#include <linux/init.h>
40#include <linux/slab.h>
41
42#include <linux/inet.h>
43#include <linux/netdevice.h>
44#include <linux/icmpv6.h>
45#include <linux/netfilter_ipv6.h>
46
47#include <net/ip.h>
48#include <net/ipv6.h>
49#include <net/udp.h>
50#include <net/udplite.h>
51#include <net/tcp.h>
52#include <net/protocol.h>
53#include <net/inet_common.h>
54#include <net/route.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>
60#endif
61
62#include <asm/uaccess.h>
63#include <linux/mroute6.h>
64
65MODULE_AUTHOR("Cast of dozens");
66MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67MODULE_LICENSE("GPL");
68
69/* The inetsw6 table contains everything that inet6_create needs to
70 * build a new socket.
71 */
72static struct list_head inetsw6[SOCK_MAX];
73static DEFINE_SPINLOCK(inetsw6_lock);
74
75struct ipv6_params ipv6_defaults = {
76	.disable_ipv6 = 0,
77	.autoconf = 1,
78};
79
80static int disable_ipv6_mod;
81
82module_param_named(disable, disable_ipv6_mod, int, 0444);
83MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
84
85module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
86MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
87
88module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
89MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
90
91static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
92{
93	const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
94
95	return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
96}
97
98static int inet6_create(struct net *net, struct socket *sock, int protocol,
99			int kern)
100{
101	struct inet_sock *inet;
102	struct ipv6_pinfo *np;
103	struct sock *sk;
104	struct inet_protosw *answer;
105	struct proto *answer_prot;
106	unsigned char answer_flags;
107	char answer_no_check;
108	int try_loading_module = 0;
109	int err;
110
111	if (sock->type != SOCK_RAW &&
112	    sock->type != SOCK_DGRAM &&
113	    !inet_ehash_secret)
114		build_ehash_secret();
115
116	/* Look for the requested type/protocol pair. */
117lookup_protocol:
118	err = -ESOCKTNOSUPPORT;
119	rcu_read_lock();
120	list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
121
122		err = 0;
123		/* Check the non-wild match. */
124		if (protocol == answer->protocol) {
125			if (protocol != IPPROTO_IP)
126				break;
127		} else {
128			/* Check for the two wild cases. */
129			if (IPPROTO_IP == protocol) {
130				protocol = answer->protocol;
131				break;
132			}
133			if (IPPROTO_IP == answer->protocol)
134				break;
135		}
136		err = -EPROTONOSUPPORT;
137	}
138
139	if (err) {
140		if (try_loading_module < 2) {
141			rcu_read_unlock();
142			/*
143			 * Be more specific, e.g. net-pf-10-proto-132-type-1
144			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
145			 */
146			if (++try_loading_module == 1)
147				request_module("net-pf-%d-proto-%d-type-%d",
148						PF_INET6, protocol, sock->type);
149			/*
150			 * Fall back to generic, e.g. net-pf-10-proto-132
151			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
152			 */
153			else
154				request_module("net-pf-%d-proto-%d",
155						PF_INET6, protocol);
156			goto lookup_protocol;
157		} else
158			goto out_rcu_unlock;
159	}
160
161	err = -EPERM;
162	if (sock->type == SOCK_RAW && !kern &&
163	    !ns_capable(net->user_ns, CAP_NET_RAW))
164		goto out_rcu_unlock;
165
166	sock->ops = answer->ops;
167	answer_prot = answer->prot;
168	answer_no_check = answer->no_check;
169	answer_flags = answer->flags;
170	rcu_read_unlock();
171
172	WARN_ON(answer_prot->slab == NULL);
173
174	err = -ENOBUFS;
175	sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
176	if (sk == NULL)
177		goto out;
178
179	sock_init_data(sock, sk);
180
181	err = 0;
182	sk->sk_no_check = answer_no_check;
183	if (INET_PROTOSW_REUSE & answer_flags)
184		sk->sk_reuse = SK_CAN_REUSE;
185
186	inet = inet_sk(sk);
187	inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
188
189	if (SOCK_RAW == sock->type) {
190		inet->inet_num = protocol;
191		if (IPPROTO_RAW == protocol)
192			inet->hdrincl = 1;
193	}
194
195	sk->sk_destruct		= inet_sock_destruct;
196	sk->sk_family		= PF_INET6;
197	sk->sk_protocol		= protocol;
198
199	sk->sk_backlog_rcv	= answer->prot->backlog_rcv;
200
201	inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
202	np->hop_limit	= -1;
203	np->mcast_hops	= IPV6_DEFAULT_MCASTHOPS;
204	np->mc_loop	= 1;
205	np->pmtudisc	= IPV6_PMTUDISC_WANT;
206	np->ipv6only	= net->ipv6.sysctl.bindv6only;
207
208	/* Init the ipv4 part of the socket since we can have sockets
209	 * using v6 API for ipv4.
210	 */
211	inet->uc_ttl	= -1;
212
213	inet->mc_loop	= 1;
214	inet->mc_ttl	= 1;
215	inet->mc_index	= 0;
216	inet->mc_list	= NULL;
217	inet->rcv_tos	= 0;
218
219	if (ipv4_config.no_pmtu_disc)
220		inet->pmtudisc = IP_PMTUDISC_DONT;
221	else
222		inet->pmtudisc = IP_PMTUDISC_WANT;
223	/*
224	 * Increment only the relevant sk_prot->socks debug field, this changes
225	 * the previous behaviour of incrementing both the equivalent to
226	 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
227	 *
228	 * This allows better debug granularity as we'll know exactly how many
229	 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
230	 * transport protocol socks. -acme
231	 */
232	sk_refcnt_debug_inc(sk);
233
234	if (inet->inet_num) {
235		/* It assumes that any protocol which allows
236		 * the user to assign a number at socket
237		 * creation time automatically shares.
238		 */
239		inet->inet_sport = htons(inet->inet_num);
240		sk->sk_prot->hash(sk);
241	}
242	if (sk->sk_prot->init) {
243		err = sk->sk_prot->init(sk);
244		if (err) {
245			sk_common_release(sk);
246			goto out;
247		}
248	}
249out:
250	return err;
251out_rcu_unlock:
252	rcu_read_unlock();
253	goto out;
254}
255
256
257/* bind for INET6 API */
258int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
259{
260	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
261	struct sock *sk = sock->sk;
262	struct inet_sock *inet = inet_sk(sk);
263	struct ipv6_pinfo *np = inet6_sk(sk);
264	struct net *net = sock_net(sk);
265	__be32 v4addr = 0;
266	unsigned short snum;
267	int addr_type = 0;
268	int err = 0;
269
270	/* If the socket has its own bind function then use it. */
271	if (sk->sk_prot->bind)
272		return sk->sk_prot->bind(sk, uaddr, addr_len);
273
274	if (addr_len < SIN6_LEN_RFC2133)
275		return -EINVAL;
276
277	if (addr->sin6_family != AF_INET6)
278		return -EAFNOSUPPORT;
279
280	addr_type = ipv6_addr_type(&addr->sin6_addr);
281	if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
282		return -EINVAL;
283
284	snum = ntohs(addr->sin6_port);
285	if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
286		return -EACCES;
287
288	lock_sock(sk);
289
290	/* Check these errors (active socket, double bind). */
291	if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
292		err = -EINVAL;
293		goto out;
294	}
295
296	/* Check if the address belongs to the host. */
297	if (addr_type == IPV6_ADDR_MAPPED) {
298		int chk_addr_ret;
299
300		/* Binding to v4-mapped address on a v6-only socket
301		 * makes no sense
302		 */
303		if (np->ipv6only) {
304			err = -EINVAL;
305			goto out;
306		}
307
308		/* Reproduce AF_INET checks to make the bindings consistent */
309		v4addr = addr->sin6_addr.s6_addr32[3];
310		chk_addr_ret = inet_addr_type(net, v4addr);
311		if (!sysctl_ip_nonlocal_bind &&
312		    !(inet->freebind || inet->transparent) &&
313		    v4addr != htonl(INADDR_ANY) &&
314		    chk_addr_ret != RTN_LOCAL &&
315		    chk_addr_ret != RTN_MULTICAST &&
316		    chk_addr_ret != RTN_BROADCAST) {
317			err = -EADDRNOTAVAIL;
318			goto out;
319		}
320	} else {
321		if (addr_type != IPV6_ADDR_ANY) {
322			struct net_device *dev = NULL;
323
324			rcu_read_lock();
325			if (__ipv6_addr_needs_scope_id(addr_type)) {
326				if (addr_len >= sizeof(struct sockaddr_in6) &&
327				    addr->sin6_scope_id) {
328					/* Override any existing binding, if another one
329					 * is supplied by user.
330					 */
331					sk->sk_bound_dev_if = addr->sin6_scope_id;
332				}
333
334				/* Binding to link-local address requires an interface */
335				if (!sk->sk_bound_dev_if) {
336					err = -EINVAL;
337					goto out_unlock;
338				}
339				dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
340				if (!dev) {
341					err = -ENODEV;
342					goto out_unlock;
343				}
344			}
345
346			/* ipv4 addr of the socket is invalid.  Only the
347			 * unspecified and mapped address have a v4 equivalent.
348			 */
349			v4addr = LOOPBACK4_IPV6;
350			if (!(addr_type & IPV6_ADDR_MULTICAST))	{
351				if (!(inet->freebind || inet->transparent) &&
352				    !ipv6_chk_addr(net, &addr->sin6_addr,
353						   dev, 0)) {
354					err = -EADDRNOTAVAIL;
355					goto out_unlock;
356				}
357			}
358			rcu_read_unlock();
359		}
360	}
361
362	inet->inet_rcv_saddr = v4addr;
363	inet->inet_saddr = v4addr;
364
365	np->rcv_saddr = addr->sin6_addr;
366
367	if (!(addr_type & IPV6_ADDR_MULTICAST))
368		np->saddr = addr->sin6_addr;
369
370	/* Make sure we are allowed to bind here. */
371	if (sk->sk_prot->get_port(sk, snum)) {
372		inet_reset_saddr(sk);
373		err = -EADDRINUSE;
374		goto out;
375	}
376
377	if (addr_type != IPV6_ADDR_ANY) {
378		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
379		if (addr_type != IPV6_ADDR_MAPPED)
380			np->ipv6only = 1;
381	}
382	if (snum)
383		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
384	inet->inet_sport = htons(inet->inet_num);
385	inet->inet_dport = 0;
386	inet->inet_daddr = 0;
387out:
388	release_sock(sk);
389	return err;
390out_unlock:
391	rcu_read_unlock();
392	goto out;
393}
394EXPORT_SYMBOL(inet6_bind);
395
396int inet6_release(struct socket *sock)
397{
398	struct sock *sk = sock->sk;
399
400	if (sk == NULL)
401		return -EINVAL;
402
403	/* Free mc lists */
404	ipv6_sock_mc_close(sk);
405
406	/* Free ac lists */
407	ipv6_sock_ac_close(sk);
408
409	return inet_release(sock);
410}
411EXPORT_SYMBOL(inet6_release);
412
413void inet6_destroy_sock(struct sock *sk)
414{
415	struct ipv6_pinfo *np = inet6_sk(sk);
416	struct sk_buff *skb;
417	struct ipv6_txoptions *opt;
418
419	/* Release rx options */
420
421	skb = xchg(&np->pktoptions, NULL);
422	if (skb != NULL)
423		kfree_skb(skb);
424
425	skb = xchg(&np->rxpmtu, NULL);
426	if (skb != NULL)
427		kfree_skb(skb);
428
429	/* Free flowlabels */
430	fl6_free_socklist(sk);
431
432	/* Free tx options */
433
434	opt = xchg(&np->opt, NULL);
435	if (opt != NULL)
436		sock_kfree_s(sk, opt, opt->tot_len);
437}
438EXPORT_SYMBOL_GPL(inet6_destroy_sock);
439
440/*
441 *	This does both peername and sockname.
442 */
443
444int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
445		 int *uaddr_len, int peer)
446{
447	struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
448	struct sock *sk = sock->sk;
449	struct inet_sock *inet = inet_sk(sk);
450	struct ipv6_pinfo *np = inet6_sk(sk);
451
452	sin->sin6_family = AF_INET6;
453	sin->sin6_flowinfo = 0;
454	sin->sin6_scope_id = 0;
455	if (peer) {
456		if (!inet->inet_dport)
457			return -ENOTCONN;
458		if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
459		    peer == 1)
460			return -ENOTCONN;
461		sin->sin6_port = inet->inet_dport;
462		sin->sin6_addr = np->daddr;
463		if (np->sndflow)
464			sin->sin6_flowinfo = np->flow_label;
465	} else {
466		if (ipv6_addr_any(&np->rcv_saddr))
467			sin->sin6_addr = np->saddr;
468		else
469			sin->sin6_addr = np->rcv_saddr;
470
471		sin->sin6_port = inet->inet_sport;
472	}
473	sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
474						 sk->sk_bound_dev_if);
475	*uaddr_len = sizeof(*sin);
476	return 0;
477}
478EXPORT_SYMBOL(inet6_getname);
479
480int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
481{
482	struct sock *sk = sock->sk;
483	struct net *net = sock_net(sk);
484
485	switch (cmd) {
486	case SIOCGSTAMP:
487		return sock_get_timestamp(sk, (struct timeval __user *)arg);
488
489	case SIOCGSTAMPNS:
490		return sock_get_timestampns(sk, (struct timespec __user *)arg);
491
492	case SIOCADDRT:
493	case SIOCDELRT:
494
495		return ipv6_route_ioctl(net, cmd, (void __user *)arg);
496
497	case SIOCSIFADDR:
498		return addrconf_add_ifaddr(net, (void __user *) arg);
499	case SIOCDIFADDR:
500		return addrconf_del_ifaddr(net, (void __user *) arg);
501	case SIOCSIFDSTADDR:
502		return addrconf_set_dstaddr(net, (void __user *) arg);
503	default:
504		if (!sk->sk_prot->ioctl)
505			return -ENOIOCTLCMD;
506		return sk->sk_prot->ioctl(sk, cmd, arg);
507	}
508	/*NOTREACHED*/
509	return 0;
510}
511EXPORT_SYMBOL(inet6_ioctl);
512
513const struct proto_ops inet6_stream_ops = {
514	.family		   = PF_INET6,
515	.owner		   = THIS_MODULE,
516	.release	   = inet6_release,
517	.bind		   = inet6_bind,
518	.connect	   = inet_stream_connect,	/* ok		*/
519	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
520	.accept		   = inet_accept,		/* ok		*/
521	.getname	   = inet6_getname,
522	.poll		   = tcp_poll,			/* ok		*/
523	.ioctl		   = inet6_ioctl,		/* must change  */
524	.listen		   = inet_listen,		/* ok		*/
525	.shutdown	   = inet_shutdown,		/* ok		*/
526	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
527	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
528	.sendmsg	   = inet_sendmsg,		/* ok		*/
529	.recvmsg	   = inet_recvmsg,		/* ok		*/
530	.mmap		   = sock_no_mmap,
531	.sendpage	   = inet_sendpage,
532	.splice_read	   = tcp_splice_read,
533#ifdef CONFIG_COMPAT
534	.compat_setsockopt = compat_sock_common_setsockopt,
535	.compat_getsockopt = compat_sock_common_getsockopt,
536#endif
537};
538
539const struct proto_ops inet6_dgram_ops = {
540	.family		   = PF_INET6,
541	.owner		   = THIS_MODULE,
542	.release	   = inet6_release,
543	.bind		   = inet6_bind,
544	.connect	   = inet_dgram_connect,	/* ok		*/
545	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
546	.accept		   = sock_no_accept,		/* a do nothing	*/
547	.getname	   = inet6_getname,
548	.poll		   = udp_poll,			/* ok		*/
549	.ioctl		   = inet6_ioctl,		/* must change  */
550	.listen		   = sock_no_listen,		/* ok		*/
551	.shutdown	   = inet_shutdown,		/* ok		*/
552	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
553	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
554	.sendmsg	   = inet_sendmsg,		/* ok		*/
555	.recvmsg	   = inet_recvmsg,		/* ok		*/
556	.mmap		   = sock_no_mmap,
557	.sendpage	   = sock_no_sendpage,
558#ifdef CONFIG_COMPAT
559	.compat_setsockopt = compat_sock_common_setsockopt,
560	.compat_getsockopt = compat_sock_common_getsockopt,
561#endif
562};
563
564static const struct net_proto_family inet6_family_ops = {
565	.family = PF_INET6,
566	.create = inet6_create,
567	.owner	= THIS_MODULE,
568};
569
570int inet6_register_protosw(struct inet_protosw *p)
571{
572	struct list_head *lh;
573	struct inet_protosw *answer;
574	struct list_head *last_perm;
575	int protocol = p->protocol;
576	int ret;
577
578	spin_lock_bh(&inetsw6_lock);
579
580	ret = -EINVAL;
581	if (p->type >= SOCK_MAX)
582		goto out_illegal;
583
584	/* If we are trying to override a permanent protocol, bail. */
585	answer = NULL;
586	ret = -EPERM;
587	last_perm = &inetsw6[p->type];
588	list_for_each(lh, &inetsw6[p->type]) {
589		answer = list_entry(lh, struct inet_protosw, list);
590
591		/* Check only the non-wild match. */
592		if (INET_PROTOSW_PERMANENT & answer->flags) {
593			if (protocol == answer->protocol)
594				break;
595			last_perm = lh;
596		}
597
598		answer = NULL;
599	}
600	if (answer)
601		goto out_permanent;
602
603	/* Add the new entry after the last permanent entry if any, so that
604	 * the new entry does not override a permanent entry when matched with
605	 * a wild-card protocol. But it is allowed to override any existing
606	 * non-permanent entry.  This means that when we remove this entry, the
607	 * system automatically returns to the old behavior.
608	 */
609	list_add_rcu(&p->list, last_perm);
610	ret = 0;
611out:
612	spin_unlock_bh(&inetsw6_lock);
613	return ret;
614
615out_permanent:
616	pr_err("Attempt to override permanent protocol %d\n", protocol);
617	goto out;
618
619out_illegal:
620	pr_err("Ignoring attempt to register invalid socket type %d\n",
621	       p->type);
622	goto out;
623}
624EXPORT_SYMBOL(inet6_register_protosw);
625
626void
627inet6_unregister_protosw(struct inet_protosw *p)
628{
629	if (INET_PROTOSW_PERMANENT & p->flags) {
630		pr_err("Attempt to unregister permanent protocol %d\n",
631		       p->protocol);
632	} else {
633		spin_lock_bh(&inetsw6_lock);
634		list_del_rcu(&p->list);
635		spin_unlock_bh(&inetsw6_lock);
636
637		synchronize_net();
638	}
639}
640EXPORT_SYMBOL(inet6_unregister_protosw);
641
642int inet6_sk_rebuild_header(struct sock *sk)
643{
644	struct ipv6_pinfo *np = inet6_sk(sk);
645	struct dst_entry *dst;
646
647	dst = __sk_dst_check(sk, np->dst_cookie);
648
649	if (dst == NULL) {
650		struct inet_sock *inet = inet_sk(sk);
651		struct in6_addr *final_p, final;
652		struct flowi6 fl6;
653
654		memset(&fl6, 0, sizeof(fl6));
655		fl6.flowi6_proto = sk->sk_protocol;
656		fl6.daddr = np->daddr;
657		fl6.saddr = np->saddr;
658		fl6.flowlabel = np->flow_label;
659		fl6.flowi6_oif = sk->sk_bound_dev_if;
660		fl6.flowi6_mark = sk->sk_mark;
661		fl6.fl6_dport = inet->inet_dport;
662		fl6.fl6_sport = inet->inet_sport;
663		security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
664
665		final_p = fl6_update_dst(&fl6, np->opt, &final);
666
667		dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
668		if (IS_ERR(dst)) {
669			sk->sk_route_caps = 0;
670			sk->sk_err_soft = -PTR_ERR(dst);
671			return PTR_ERR(dst);
672		}
673
674		__ip6_dst_store(sk, dst, NULL, NULL);
675	}
676
677	return 0;
678}
679EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
680
681bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb)
682{
683	const struct ipv6_pinfo *np = inet6_sk(sk);
684	const struct inet6_skb_parm *opt = IP6CB(skb);
685
686	if (np->rxopt.all) {
687		if ((opt->hop && (np->rxopt.bits.hopopts ||
688				  np->rxopt.bits.ohopopts)) ||
689		    ((IPV6_FLOWINFO_MASK &
690		      *(__be32 *)skb_network_header(skb)) &&
691		     np->rxopt.bits.rxflow) ||
692		    (opt->srcrt && (np->rxopt.bits.srcrt ||
693		     np->rxopt.bits.osrcrt)) ||
694		    ((opt->dst1 || opt->dst0) &&
695		     (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
696			return true;
697	}
698	return false;
699}
700EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
701
702static struct packet_type ipv6_packet_type __read_mostly = {
703	.type = cpu_to_be16(ETH_P_IPV6),
704	.func = ipv6_rcv,
705};
706
707static int __init ipv6_packet_init(void)
708{
709	dev_add_pack(&ipv6_packet_type);
710	return 0;
711}
712
713static void ipv6_packet_cleanup(void)
714{
715	dev_remove_pack(&ipv6_packet_type);
716}
717
718static int __net_init ipv6_init_mibs(struct net *net)
719{
720	if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
721			  sizeof(struct udp_mib),
722			  __alignof__(struct udp_mib)) < 0)
723		return -ENOMEM;
724	if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
725			  sizeof(struct udp_mib),
726			  __alignof__(struct udp_mib)) < 0)
727		goto err_udplite_mib;
728	if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
729			  sizeof(struct ipstats_mib),
730			  __alignof__(struct ipstats_mib)) < 0)
731		goto err_ip_mib;
732	if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
733			  sizeof(struct icmpv6_mib),
734			  __alignof__(struct icmpv6_mib)) < 0)
735		goto err_icmp_mib;
736	net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
737						GFP_KERNEL);
738	if (!net->mib.icmpv6msg_statistics)
739		goto err_icmpmsg_mib;
740	return 0;
741
742err_icmpmsg_mib:
743	snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
744err_icmp_mib:
745	snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
746err_ip_mib:
747	snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
748err_udplite_mib:
749	snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
750	return -ENOMEM;
751}
752
753static void ipv6_cleanup_mibs(struct net *net)
754{
755	snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
756	snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
757	snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
758	snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
759	kfree(net->mib.icmpv6msg_statistics);
760}
761
762static int __net_init inet6_net_init(struct net *net)
763{
764	int err = 0;
765
766	net->ipv6.sysctl.bindv6only = 0;
767	net->ipv6.sysctl.icmpv6_time = 1*HZ;
768
769	err = ipv6_init_mibs(net);
770	if (err)
771		return err;
772#ifdef CONFIG_PROC_FS
773	err = udp6_proc_init(net);
774	if (err)
775		goto out;
776	err = tcp6_proc_init(net);
777	if (err)
778		goto proc_tcp6_fail;
779	err = ac6_proc_init(net);
780	if (err)
781		goto proc_ac6_fail;
782#endif
783	return err;
784
785#ifdef CONFIG_PROC_FS
786proc_ac6_fail:
787	tcp6_proc_exit(net);
788proc_tcp6_fail:
789	udp6_proc_exit(net);
790out:
791	ipv6_cleanup_mibs(net);
792	return err;
793#endif
794}
795
796static void __net_exit inet6_net_exit(struct net *net)
797{
798#ifdef CONFIG_PROC_FS
799	udp6_proc_exit(net);
800	tcp6_proc_exit(net);
801	ac6_proc_exit(net);
802#endif
803	ipv6_cleanup_mibs(net);
804}
805
806static struct pernet_operations inet6_net_ops = {
807	.init = inet6_net_init,
808	.exit = inet6_net_exit,
809};
810
811static int __init inet6_init(void)
812{
813	struct list_head *r;
814	int err = 0;
815
816	BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
817
818	/* Register the socket-side information for inet6_create.  */
819	for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
820		INIT_LIST_HEAD(r);
821
822	if (disable_ipv6_mod) {
823		pr_info("Loaded, but administratively disabled, reboot required to enable\n");
824		goto out;
825	}
826
827	err = proto_register(&tcpv6_prot, 1);
828	if (err)
829		goto out;
830
831	err = proto_register(&udpv6_prot, 1);
832	if (err)
833		goto out_unregister_tcp_proto;
834
835	err = proto_register(&udplitev6_prot, 1);
836	if (err)
837		goto out_unregister_udp_proto;
838
839	err = proto_register(&rawv6_prot, 1);
840	if (err)
841		goto out_unregister_udplite_proto;
842
843
844	/* We MUST register RAW sockets before we create the ICMP6,
845	 * IGMP6, or NDISC control sockets.
846	 */
847	err = rawv6_init();
848	if (err)
849		goto out_unregister_raw_proto;
850
851	/* Register the family here so that the init calls below will
852	 * be able to create sockets. (?? is this dangerous ??)
853	 */
854	err = sock_register(&inet6_family_ops);
855	if (err)
856		goto out_sock_register_fail;
857
858	tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
859
860	/*
861	 *	ipngwg API draft makes clear that the correct semantics
862	 *	for TCP and UDP is to consider one TCP and UDP instance
863	 *	in a host available by both INET and INET6 APIs and
864	 *	able to communicate via both network protocols.
865	 */
866
867	err = register_pernet_subsys(&inet6_net_ops);
868	if (err)
869		goto register_pernet_fail;
870	err = icmpv6_init();
871	if (err)
872		goto icmp_fail;
873	err = ip6_mr_init();
874	if (err)
875		goto ipmr_fail;
876	err = ndisc_init();
877	if (err)
878		goto ndisc_fail;
879	err = igmp6_init();
880	if (err)
881		goto igmp_fail;
882	err = ipv6_netfilter_init();
883	if (err)
884		goto netfilter_fail;
885	/* Create /proc/foo6 entries. */
886#ifdef CONFIG_PROC_FS
887	err = -ENOMEM;
888	if (raw6_proc_init())
889		goto proc_raw6_fail;
890	if (udplite6_proc_init())
891		goto proc_udplite6_fail;
892	if (ipv6_misc_proc_init())
893		goto proc_misc6_fail;
894	if (if6_proc_init())
895		goto proc_if6_fail;
896#endif
897	err = ip6_route_init();
898	if (err)
899		goto ip6_route_fail;
900	err = ip6_flowlabel_init();
901	if (err)
902		goto ip6_flowlabel_fail;
903	err = addrconf_init();
904	if (err)
905		goto addrconf_fail;
906
907	/* Init v6 extension headers. */
908	err = ipv6_exthdrs_init();
909	if (err)
910		goto ipv6_exthdrs_fail;
911
912	err = ipv6_frag_init();
913	if (err)
914		goto ipv6_frag_fail;
915
916	/* Init v6 transport protocols. */
917	err = udpv6_init();
918	if (err)
919		goto udpv6_fail;
920
921	err = udplitev6_init();
922	if (err)
923		goto udplitev6_fail;
924
925	err = tcpv6_init();
926	if (err)
927		goto tcpv6_fail;
928
929	err = ipv6_packet_init();
930	if (err)
931		goto ipv6_packet_fail;
932
933#ifdef CONFIG_SYSCTL
934	err = ipv6_sysctl_register();
935	if (err)
936		goto sysctl_fail;
937#endif
938out:
939	return err;
940
941#ifdef CONFIG_SYSCTL
942sysctl_fail:
943	ipv6_packet_cleanup();
944#endif
945ipv6_packet_fail:
946	tcpv6_exit();
947tcpv6_fail:
948	udplitev6_exit();
949udplitev6_fail:
950	udpv6_exit();
951udpv6_fail:
952	ipv6_frag_exit();
953ipv6_frag_fail:
954	ipv6_exthdrs_exit();
955ipv6_exthdrs_fail:
956	addrconf_cleanup();
957addrconf_fail:
958	ip6_flowlabel_cleanup();
959ip6_flowlabel_fail:
960	ip6_route_cleanup();
961ip6_route_fail:
962#ifdef CONFIG_PROC_FS
963	if6_proc_exit();
964proc_if6_fail:
965	ipv6_misc_proc_exit();
966proc_misc6_fail:
967	udplite6_proc_exit();
968proc_udplite6_fail:
969	raw6_proc_exit();
970proc_raw6_fail:
971#endif
972	ipv6_netfilter_fini();
973netfilter_fail:
974	igmp6_cleanup();
975igmp_fail:
976	ndisc_cleanup();
977ndisc_fail:
978	ip6_mr_cleanup();
979ipmr_fail:
980	icmpv6_cleanup();
981icmp_fail:
982	unregister_pernet_subsys(&inet6_net_ops);
983register_pernet_fail:
984	sock_unregister(PF_INET6);
985	rtnl_unregister_all(PF_INET6);
986out_sock_register_fail:
987	rawv6_exit();
988out_unregister_raw_proto:
989	proto_unregister(&rawv6_prot);
990out_unregister_udplite_proto:
991	proto_unregister(&udplitev6_prot);
992out_unregister_udp_proto:
993	proto_unregister(&udpv6_prot);
994out_unregister_tcp_proto:
995	proto_unregister(&tcpv6_prot);
996	goto out;
997}
998module_init(inet6_init);
999
1000static void __exit inet6_exit(void)
1001{
1002	if (disable_ipv6_mod)
1003		return;
1004
1005	/* First of all disallow new sockets creation. */
1006	sock_unregister(PF_INET6);
1007	/* Disallow any further netlink messages */
1008	rtnl_unregister_all(PF_INET6);
1009
1010	udpv6_exit();
1011	udplitev6_exit();
1012	tcpv6_exit();
1013
1014	/* Cleanup code parts. */
1015	ipv6_packet_cleanup();
1016	ipv6_frag_exit();
1017	ipv6_exthdrs_exit();
1018	addrconf_cleanup();
1019	ip6_flowlabel_cleanup();
1020	ip6_route_cleanup();
1021#ifdef CONFIG_PROC_FS
1022
1023	/* Cleanup code parts. */
1024	if6_proc_exit();
1025	ipv6_misc_proc_exit();
1026	udplite6_proc_exit();
1027	raw6_proc_exit();
1028#endif
1029	ipv6_netfilter_fini();
1030	igmp6_cleanup();
1031	ndisc_cleanup();
1032	ip6_mr_cleanup();
1033	icmpv6_cleanup();
1034	rawv6_exit();
1035
1036	unregister_pernet_subsys(&inet6_net_ops);
1037	proto_unregister(&rawv6_prot);
1038	proto_unregister(&udplitev6_prot);
1039	proto_unregister(&udpv6_prot);
1040	proto_unregister(&tcpv6_prot);
1041
1042	rcu_barrier(); /* Wait for completion of call_rcu()'s */
1043}
1044module_exit(inet6_exit);
1045
1046MODULE_ALIAS_NETPROTO(PF_INET6);
1047