af_inet6.c revision 0a513f6af962525ed4b3395f8c8d5daae8682aa9 
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
22#include <linux/module.h>
23#include <linux/capability.h>
24#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/in.h>
28#include <linux/kernel.h>
29#include <linux/timer.h>
30#include <linux/string.h>
31#include <linux/sockios.h>
32#include <linux/net.h>
33#include <linux/fcntl.h>
34#include <linux/mm.h>
35#include <linux/interrupt.h>
36#include <linux/proc_fs.h>
37#include <linux/stat.h>
38#include <linux/init.h>
39#include <linux/slab.h>
40
41#include <linux/inet.h>
42#include <linux/netdevice.h>
43#include <linux/icmpv6.h>
44#include <linux/netfilter_ipv6.h>
45
46#include <net/ip.h>
47#include <net/ipv6.h>
48#include <net/udp.h>
49#include <net/udplite.h>
50#include <net/tcp.h>
51#include <net/ipip.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 <asm/system.h>
64#include <linux/mroute6.h>
65
66MODULE_AUTHOR("Cast of dozens");
67MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
68MODULE_LICENSE("GPL");
69
70/* The inetsw6 table contains everything that inet6_create needs to
71 * build a new socket.
72 */
73static struct list_head inetsw6[SOCK_MAX];
74static DEFINE_SPINLOCK(inetsw6_lock);
75
76struct ipv6_params ipv6_defaults = {
77	.disable_ipv6 = 0,
78	.autoconf = 1,
79};
80
81static int disable_ipv6_mod = 0;
82
83module_param_named(disable, disable_ipv6_mod, int, 0444);
84MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
85
86module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
87MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
88
89module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
90MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
91
92static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
93{
94	const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
95
96	return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
97}
98
99static int inet6_create(struct net *net, struct socket *sock, int protocol,
100			int kern)
101{
102	struct inet_sock *inet;
103	struct ipv6_pinfo *np;
104	struct sock *sk;
105	struct inet_protosw *answer;
106	struct proto *answer_prot;
107	unsigned char answer_flags;
108	char answer_no_check;
109	int try_loading_module = 0;
110	int err;
111
112	if (sock->type != SOCK_RAW &&
113	    sock->type != SOCK_DGRAM &&
114	    !inet_ehash_secret)
115		build_ehash_secret();
116
117	/* Look for the requested type/protocol pair. */
118lookup_protocol:
119	err = -ESOCKTNOSUPPORT;
120	rcu_read_lock();
121	list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
122
123		err = 0;
124		/* Check the non-wild match. */
125		if (protocol == answer->protocol) {
126			if (protocol != IPPROTO_IP)
127				break;
128		} else {
129			/* Check for the two wild cases. */
130			if (IPPROTO_IP == protocol) {
131				protocol = answer->protocol;
132				break;
133			}
134			if (IPPROTO_IP == answer->protocol)
135				break;
136		}
137		err = -EPROTONOSUPPORT;
138	}
139
140	if (err) {
141		if (try_loading_module < 2) {
142			rcu_read_unlock();
143			/*
144			 * Be more specific, e.g. net-pf-10-proto-132-type-1
145			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
146			 */
147			if (++try_loading_module == 1)
148				request_module("net-pf-%d-proto-%d-type-%d",
149						PF_INET6, protocol, sock->type);
150			/*
151			 * Fall back to generic, e.g. net-pf-10-proto-132
152			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
153			 */
154			else
155				request_module("net-pf-%d-proto-%d",
156						PF_INET6, protocol);
157			goto lookup_protocol;
158		} else
159			goto out_rcu_unlock;
160	}
161
162	err = -EPERM;
163	if (sock->type == SOCK_RAW && !kern && !capable(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 = 1;
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
218	if (ipv4_config.no_pmtu_disc)
219		inet->pmtudisc = IP_PMTUDISC_DONT;
220	else
221		inet->pmtudisc = IP_PMTUDISC_WANT;
222	/*
223	 * Increment only the relevant sk_prot->socks debug field, this changes
224	 * the previous behaviour of incrementing both the equivalent to
225	 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
226	 *
227	 * This allows better debug granularity as we'll know exactly how many
228	 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
229	 * transport protocol socks. -acme
230	 */
231	sk_refcnt_debug_inc(sk);
232
233	if (inet->inet_num) {
234		/* It assumes that any protocol which allows
235		 * the user to assign a number at socket
236		 * creation time automatically shares.
237		 */
238		inet->inet_sport = htons(inet->inet_num);
239		sk->sk_prot->hash(sk);
240	}
241	if (sk->sk_prot->init) {
242		err = sk->sk_prot->init(sk);
243		if (err) {
244			sk_common_release(sk);
245			goto out;
246		}
247	}
248out:
249	return err;
250out_rcu_unlock:
251	rcu_read_unlock();
252	goto out;
253}
254
255
256/* bind for INET6 API */
257int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
258{
259	struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
260	struct sock *sk = sock->sk;
261	struct inet_sock *inet = inet_sk(sk);
262	struct ipv6_pinfo *np = inet6_sk(sk);
263	struct net *net = sock_net(sk);
264	__be32 v4addr = 0;
265	unsigned short snum;
266	int addr_type = 0;
267	int err = 0;
268
269	/* If the socket has its own bind function then use it. */
270	if (sk->sk_prot->bind)
271		return sk->sk_prot->bind(sk, uaddr, addr_len);
272
273	if (addr_len < SIN6_LEN_RFC2133)
274		return -EINVAL;
275	addr_type = ipv6_addr_type(&addr->sin6_addr);
276	if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
277		return -EINVAL;
278
279	snum = ntohs(addr->sin6_port);
280	if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
281		return -EACCES;
282
283	lock_sock(sk);
284
285	/* Check these errors (active socket, double bind). */
286	if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
287		err = -EINVAL;
288		goto out;
289	}
290
291	/* Check if the address belongs to the host. */
292	if (addr_type == IPV6_ADDR_MAPPED) {
293		int chk_addr_ret;
294
295		/* Binding to v4-mapped address on a v6-only socket
296		 * makes no sense
297		 */
298		if (np->ipv6only) {
299			err = -EINVAL;
300			goto out;
301		}
302
303		/* Reproduce AF_INET checks to make the bindings consitant */
304		v4addr = addr->sin6_addr.s6_addr32[3];
305		chk_addr_ret = inet_addr_type(net, v4addr);
306		if (!sysctl_ip_nonlocal_bind &&
307		    !(inet->freebind || inet->transparent) &&
308		    v4addr != htonl(INADDR_ANY) &&
309		    chk_addr_ret != RTN_LOCAL &&
310		    chk_addr_ret != RTN_MULTICAST &&
311		    chk_addr_ret != RTN_BROADCAST) {
312			err = -EADDRNOTAVAIL;
313			goto out;
314		}
315	} else {
316		if (addr_type != IPV6_ADDR_ANY) {
317			struct net_device *dev = NULL;
318
319			rcu_read_lock();
320			if (addr_type & IPV6_ADDR_LINKLOCAL) {
321				if (addr_len >= sizeof(struct sockaddr_in6) &&
322				    addr->sin6_scope_id) {
323					/* Override any existing binding, if another one
324					 * is supplied by user.
325					 */
326					sk->sk_bound_dev_if = addr->sin6_scope_id;
327				}
328
329				/* Binding to link-local address requires an interface */
330				if (!sk->sk_bound_dev_if) {
331					err = -EINVAL;
332					goto out_unlock;
333				}
334				dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
335				if (!dev) {
336					err = -ENODEV;
337					goto out_unlock;
338				}
339			}
340
341			/* ipv4 addr of the socket is invalid.  Only the
342			 * unspecified and mapped address have a v4 equivalent.
343			 */
344			v4addr = LOOPBACK4_IPV6;
345			if (!(addr_type & IPV6_ADDR_MULTICAST))	{
346				if (!inet->transparent &&
347				    !ipv6_chk_addr(net, &addr->sin6_addr,
348						   dev, 0)) {
349					err = -EADDRNOTAVAIL;
350					goto out_unlock;
351				}
352			}
353			rcu_read_unlock();
354		}
355	}
356
357	inet->inet_rcv_saddr = v4addr;
358	inet->inet_saddr = v4addr;
359
360	ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
361
362	if (!(addr_type & IPV6_ADDR_MULTICAST))
363		ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
364
365	/* Make sure we are allowed to bind here. */
366	if (sk->sk_prot->get_port(sk, snum)) {
367		inet_reset_saddr(sk);
368		err = -EADDRINUSE;
369		goto out;
370	}
371
372	if (addr_type != IPV6_ADDR_ANY) {
373		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
374		if (addr_type != IPV6_ADDR_MAPPED)
375			np->ipv6only = 1;
376	}
377	if (snum)
378		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
379	inet->inet_sport = htons(inet->inet_num);
380	inet->inet_dport = 0;
381	inet->inet_daddr = 0;
382out:
383	release_sock(sk);
384	return err;
385out_unlock:
386	rcu_read_unlock();
387	goto out;
388}
389
390EXPORT_SYMBOL(inet6_bind);
391
392int inet6_release(struct socket *sock)
393{
394	struct sock *sk = sock->sk;
395
396	if (sk == NULL)
397		return -EINVAL;
398
399	/* Free mc lists */
400	ipv6_sock_mc_close(sk);
401
402	/* Free ac lists */
403	ipv6_sock_ac_close(sk);
404
405	return inet_release(sock);
406}
407
408EXPORT_SYMBOL(inet6_release);
409
410void inet6_destroy_sock(struct sock *sk)
411{
412	struct ipv6_pinfo *np = inet6_sk(sk);
413	struct sk_buff *skb;
414	struct ipv6_txoptions *opt;
415
416	/* Release rx options */
417
418	if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
419		kfree_skb(skb);
420
421	if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
422		kfree_skb(skb);
423
424	/* Free flowlabels */
425	fl6_free_socklist(sk);
426
427	/* Free tx options */
428
429	if ((opt = xchg(&np->opt, NULL)) != NULL)
430		sock_kfree_s(sk, opt, opt->tot_len);
431}
432
433EXPORT_SYMBOL_GPL(inet6_destroy_sock);
434
435/*
436 *	This does both peername and sockname.
437 */
438
439int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
440		 int *uaddr_len, int peer)
441{
442	struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
443	struct sock *sk = sock->sk;
444	struct inet_sock *inet = inet_sk(sk);
445	struct ipv6_pinfo *np = inet6_sk(sk);
446
447	sin->sin6_family = AF_INET6;
448	sin->sin6_flowinfo = 0;
449	sin->sin6_scope_id = 0;
450	if (peer) {
451		if (!inet->inet_dport)
452			return -ENOTCONN;
453		if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
454		    peer == 1)
455			return -ENOTCONN;
456		sin->sin6_port = inet->inet_dport;
457		ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
458		if (np->sndflow)
459			sin->sin6_flowinfo = np->flow_label;
460	} else {
461		if (ipv6_addr_any(&np->rcv_saddr))
462			ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
463		else
464			ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
465
466		sin->sin6_port = inet->inet_sport;
467	}
468	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
469		sin->sin6_scope_id = sk->sk_bound_dev_if;
470	*uaddr_len = sizeof(*sin);
471	return(0);
472}
473
474EXPORT_SYMBOL(inet6_getname);
475
476int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
477{
478	struct sock *sk = sock->sk;
479	struct net *net = sock_net(sk);
480
481	switch(cmd)
482	{
483	case SIOCGSTAMP:
484		return sock_get_timestamp(sk, (struct timeval __user *)arg);
485
486	case SIOCGSTAMPNS:
487		return sock_get_timestampns(sk, (struct timespec __user *)arg);
488
489	case SIOCADDRT:
490	case SIOCDELRT:
491
492		return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
493
494	case SIOCSIFADDR:
495		return addrconf_add_ifaddr(net, (void __user *) arg);
496	case SIOCDIFADDR:
497		return addrconf_del_ifaddr(net, (void __user *) arg);
498	case SIOCSIFDSTADDR:
499		return addrconf_set_dstaddr(net, (void __user *) arg);
500	default:
501		if (!sk->sk_prot->ioctl)
502			return -ENOIOCTLCMD;
503		return sk->sk_prot->ioctl(sk, cmd, arg);
504	}
505	/*NOTREACHED*/
506	return(0);
507}
508
509EXPORT_SYMBOL(inet6_ioctl);
510
511const struct proto_ops inet6_stream_ops = {
512	.family		   = PF_INET6,
513	.owner		   = THIS_MODULE,
514	.release	   = inet6_release,
515	.bind		   = inet6_bind,
516	.connect	   = inet_stream_connect,	/* ok		*/
517	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
518	.accept		   = inet_accept,		/* ok		*/
519	.getname	   = inet6_getname,
520	.poll		   = tcp_poll,			/* ok		*/
521	.ioctl		   = inet6_ioctl,		/* must change  */
522	.listen		   = inet_listen,		/* ok		*/
523	.shutdown	   = inet_shutdown,		/* ok		*/
524	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
525	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
526	.sendmsg	   = inet_sendmsg,		/* ok		*/
527	.recvmsg	   = inet_recvmsg,		/* ok		*/
528	.mmap		   = sock_no_mmap,
529	.sendpage	   = inet_sendpage,
530	.splice_read	   = tcp_splice_read,
531#ifdef CONFIG_COMPAT
532	.compat_setsockopt = compat_sock_common_setsockopt,
533	.compat_getsockopt = compat_sock_common_getsockopt,
534#endif
535};
536
537const struct proto_ops inet6_dgram_ops = {
538	.family		   = PF_INET6,
539	.owner		   = THIS_MODULE,
540	.release	   = inet6_release,
541	.bind		   = inet6_bind,
542	.connect	   = inet_dgram_connect,	/* ok		*/
543	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
544	.accept		   = sock_no_accept,		/* a do nothing	*/
545	.getname	   = inet6_getname,
546	.poll		   = udp_poll,			/* ok		*/
547	.ioctl		   = inet6_ioctl,		/* must change  */
548	.listen		   = sock_no_listen,		/* ok		*/
549	.shutdown	   = inet_shutdown,		/* ok		*/
550	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
551	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
552	.sendmsg	   = inet_sendmsg,		/* ok		*/
553	.recvmsg	   = inet_recvmsg,		/* ok		*/
554	.mmap		   = sock_no_mmap,
555	.sendpage	   = sock_no_sendpage,
556#ifdef CONFIG_COMPAT
557	.compat_setsockopt = compat_sock_common_setsockopt,
558	.compat_getsockopt = compat_sock_common_getsockopt,
559#endif
560};
561
562static const struct net_proto_family inet6_family_ops = {
563	.family = PF_INET6,
564	.create = inet6_create,
565	.owner	= THIS_MODULE,
566};
567
568int inet6_register_protosw(struct inet_protosw *p)
569{
570	struct list_head *lh;
571	struct inet_protosw *answer;
572	struct list_head *last_perm;
573	int protocol = p->protocol;
574	int ret;
575
576	spin_lock_bh(&inetsw6_lock);
577
578	ret = -EINVAL;
579	if (p->type >= SOCK_MAX)
580		goto out_illegal;
581
582	/* If we are trying to override a permanent protocol, bail. */
583	answer = NULL;
584	ret = -EPERM;
585	last_perm = &inetsw6[p->type];
586	list_for_each(lh, &inetsw6[p->type]) {
587		answer = list_entry(lh, struct inet_protosw, list);
588
589		/* Check only the non-wild match. */
590		if (INET_PROTOSW_PERMANENT & answer->flags) {
591			if (protocol == answer->protocol)
592				break;
593			last_perm = lh;
594		}
595
596		answer = NULL;
597	}
598	if (answer)
599		goto out_permanent;
600
601	/* Add the new entry after the last permanent entry if any, so that
602	 * the new entry does not override a permanent entry when matched with
603	 * a wild-card protocol. But it is allowed to override any existing
604	 * non-permanent entry.  This means that when we remove this entry, the
605	 * system automatically returns to the old behavior.
606	 */
607	list_add_rcu(&p->list, last_perm);
608	ret = 0;
609out:
610	spin_unlock_bh(&inetsw6_lock);
611	return ret;
612
613out_permanent:
614	printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
615	       protocol);
616	goto out;
617
618out_illegal:
619	printk(KERN_ERR
620	       "Ignoring attempt to register invalid socket type %d.\n",
621	       p->type);
622	goto out;
623}
624
625EXPORT_SYMBOL(inet6_register_protosw);
626
627void
628inet6_unregister_protosw(struct inet_protosw *p)
629{
630	if (INET_PROTOSW_PERMANENT & p->flags) {
631		printk(KERN_ERR
632		       "Attempt to unregister permanent protocol %d.\n",
633		       p->protocol);
634	} else {
635		spin_lock_bh(&inetsw6_lock);
636		list_del_rcu(&p->list);
637		spin_unlock_bh(&inetsw6_lock);
638
639		synchronize_net();
640	}
641}
642
643EXPORT_SYMBOL(inet6_unregister_protosw);
644
645int inet6_sk_rebuild_header(struct sock *sk)
646{
647	int err;
648	struct dst_entry *dst;
649	struct ipv6_pinfo *np = inet6_sk(sk);
650
651	dst = __sk_dst_check(sk, np->dst_cookie);
652
653	if (dst == NULL) {
654		struct inet_sock *inet = inet_sk(sk);
655		struct in6_addr *final_p, final;
656		struct flowi fl;
657
658		memset(&fl, 0, sizeof(fl));
659		fl.proto = sk->sk_protocol;
660		ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
661		ipv6_addr_copy(&fl.fl6_src, &np->saddr);
662		fl.fl6_flowlabel = np->flow_label;
663		fl.oif = sk->sk_bound_dev_if;
664		fl.mark = sk->sk_mark;
665		fl.fl_ip_dport = inet->inet_dport;
666		fl.fl_ip_sport = inet->inet_sport;
667		security_sk_classify_flow(sk, &fl);
668
669		final_p = fl6_update_dst(&fl, np->opt, &final);
670
671		err = ip6_dst_lookup(sk, &dst, &fl);
672		if (err) {
673			sk->sk_route_caps = 0;
674			return err;
675		}
676		if (final_p)
677			ipv6_addr_copy(&fl.fl6_dst, final_p);
678
679		if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
680			sk->sk_err_soft = -err;
681			return err;
682		}
683
684		__ip6_dst_store(sk, dst, NULL, NULL);
685	}
686
687	return 0;
688}
689
690EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
691
692int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
693{
694	struct ipv6_pinfo *np = inet6_sk(sk);
695	struct inet6_skb_parm *opt = IP6CB(skb);
696
697	if (np->rxopt.all) {
698		if ((opt->hop && (np->rxopt.bits.hopopts ||
699				  np->rxopt.bits.ohopopts)) ||
700		    ((IPV6_FLOWINFO_MASK &
701		      *(__be32 *)skb_network_header(skb)) &&
702		     np->rxopt.bits.rxflow) ||
703		    (opt->srcrt && (np->rxopt.bits.srcrt ||
704		     np->rxopt.bits.osrcrt)) ||
705		    ((opt->dst1 || opt->dst0) &&
706		     (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
707			return 1;
708	}
709	return 0;
710}
711
712EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
713
714static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
715{
716	const struct inet6_protocol *ops = NULL;
717
718	for (;;) {
719		struct ipv6_opt_hdr *opth;
720		int len;
721
722		if (proto != NEXTHDR_HOP) {
723			ops = rcu_dereference(inet6_protos[proto]);
724
725			if (unlikely(!ops))
726				break;
727
728			if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
729				break;
730		}
731
732		if (unlikely(!pskb_may_pull(skb, 8)))
733			break;
734
735		opth = (void *)skb->data;
736		len = ipv6_optlen(opth);
737
738		if (unlikely(!pskb_may_pull(skb, len)))
739			break;
740
741		proto = opth->nexthdr;
742		__skb_pull(skb, len);
743	}
744
745	return proto;
746}
747
748static int ipv6_gso_send_check(struct sk_buff *skb)
749{
750	struct ipv6hdr *ipv6h;
751	const struct inet6_protocol *ops;
752	int err = -EINVAL;
753
754	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
755		goto out;
756
757	ipv6h = ipv6_hdr(skb);
758	__skb_pull(skb, sizeof(*ipv6h));
759	err = -EPROTONOSUPPORT;
760
761	rcu_read_lock();
762	ops = rcu_dereference(inet6_protos[
763		ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
764
765	if (likely(ops && ops->gso_send_check)) {
766		skb_reset_transport_header(skb);
767		err = ops->gso_send_check(skb);
768	}
769	rcu_read_unlock();
770
771out:
772	return err;
773}
774
775static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
776{
777	struct sk_buff *segs = ERR_PTR(-EINVAL);
778	struct ipv6hdr *ipv6h;
779	const struct inet6_protocol *ops;
780	int proto;
781	struct frag_hdr *fptr;
782	unsigned int unfrag_ip6hlen;
783	u8 *prevhdr;
784	int offset = 0;
785
786	if (!(features & NETIF_F_V6_CSUM))
787		features &= ~NETIF_F_SG;
788
789	if (unlikely(skb_shinfo(skb)->gso_type &
790		     ~(SKB_GSO_UDP |
791		       SKB_GSO_DODGY |
792		       SKB_GSO_TCP_ECN |
793		       SKB_GSO_TCPV6 |
794		       0)))
795		goto out;
796
797	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
798		goto out;
799
800	ipv6h = ipv6_hdr(skb);
801	__skb_pull(skb, sizeof(*ipv6h));
802	segs = ERR_PTR(-EPROTONOSUPPORT);
803
804	proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
805	rcu_read_lock();
806	ops = rcu_dereference(inet6_protos[proto]);
807	if (likely(ops && ops->gso_segment)) {
808		skb_reset_transport_header(skb);
809		segs = ops->gso_segment(skb, features);
810	}
811	rcu_read_unlock();
812
813	if (unlikely(IS_ERR(segs)))
814		goto out;
815
816	for (skb = segs; skb; skb = skb->next) {
817		ipv6h = ipv6_hdr(skb);
818		ipv6h->payload_len = htons(skb->len - skb->mac_len -
819					   sizeof(*ipv6h));
820		if (proto == IPPROTO_UDP) {
821			unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
822			fptr = (struct frag_hdr *)(skb_network_header(skb) +
823				unfrag_ip6hlen);
824			fptr->frag_off = htons(offset);
825			if (skb->next != NULL)
826				fptr->frag_off |= htons(IP6_MF);
827			offset += (ntohs(ipv6h->payload_len) -
828				   sizeof(struct frag_hdr));
829		}
830	}
831
832out:
833	return segs;
834}
835
836struct ipv6_gro_cb {
837	struct napi_gro_cb napi;
838	int proto;
839};
840
841#define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
842
843static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
844					 struct sk_buff *skb)
845{
846	const struct inet6_protocol *ops;
847	struct sk_buff **pp = NULL;
848	struct sk_buff *p;
849	struct ipv6hdr *iph;
850	unsigned int nlen;
851	unsigned int hlen;
852	unsigned int off;
853	int flush = 1;
854	int proto;
855	__wsum csum;
856
857	off = skb_gro_offset(skb);
858	hlen = off + sizeof(*iph);
859	iph = skb_gro_header_fast(skb, off);
860	if (skb_gro_header_hard(skb, hlen)) {
861		iph = skb_gro_header_slow(skb, hlen, off);
862		if (unlikely(!iph))
863			goto out;
864	}
865
866	skb_gro_pull(skb, sizeof(*iph));
867	skb_set_transport_header(skb, skb_gro_offset(skb));
868
869	flush += ntohs(iph->payload_len) != skb_gro_len(skb);
870
871	rcu_read_lock();
872	proto = iph->nexthdr;
873	ops = rcu_dereference(inet6_protos[proto]);
874	if (!ops || !ops->gro_receive) {
875		__pskb_pull(skb, skb_gro_offset(skb));
876		proto = ipv6_gso_pull_exthdrs(skb, proto);
877		skb_gro_pull(skb, -skb_transport_offset(skb));
878		skb_reset_transport_header(skb);
879		__skb_push(skb, skb_gro_offset(skb));
880
881		if (!ops || !ops->gro_receive)
882			goto out_unlock;
883
884		iph = ipv6_hdr(skb);
885	}
886
887	IPV6_GRO_CB(skb)->proto = proto;
888
889	flush--;
890	nlen = skb_network_header_len(skb);
891
892	for (p = *head; p; p = p->next) {
893		struct ipv6hdr *iph2;
894
895		if (!NAPI_GRO_CB(p)->same_flow)
896			continue;
897
898		iph2 = ipv6_hdr(p);
899
900		/* All fields must match except length. */
901		if (nlen != skb_network_header_len(p) ||
902		    memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
903		    memcmp(&iph->nexthdr, &iph2->nexthdr,
904			   nlen - offsetof(struct ipv6hdr, nexthdr))) {
905			NAPI_GRO_CB(p)->same_flow = 0;
906			continue;
907		}
908
909		NAPI_GRO_CB(p)->flush |= flush;
910	}
911
912	NAPI_GRO_CB(skb)->flush |= flush;
913
914	csum = skb->csum;
915	skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
916
917	pp = ops->gro_receive(head, skb);
918
919	skb->csum = csum;
920
921out_unlock:
922	rcu_read_unlock();
923
924out:
925	NAPI_GRO_CB(skb)->flush |= flush;
926
927	return pp;
928}
929
930static int ipv6_gro_complete(struct sk_buff *skb)
931{
932	const struct inet6_protocol *ops;
933	struct ipv6hdr *iph = ipv6_hdr(skb);
934	int err = -ENOSYS;
935
936	iph->payload_len = htons(skb->len - skb_network_offset(skb) -
937				 sizeof(*iph));
938
939	rcu_read_lock();
940	ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
941	if (WARN_ON(!ops || !ops->gro_complete))
942		goto out_unlock;
943
944	err = ops->gro_complete(skb);
945
946out_unlock:
947	rcu_read_unlock();
948
949	return err;
950}
951
952static struct packet_type ipv6_packet_type __read_mostly = {
953	.type = cpu_to_be16(ETH_P_IPV6),
954	.func = ipv6_rcv,
955	.gso_send_check = ipv6_gso_send_check,
956	.gso_segment = ipv6_gso_segment,
957	.gro_receive = ipv6_gro_receive,
958	.gro_complete = ipv6_gro_complete,
959};
960
961static int __init ipv6_packet_init(void)
962{
963	dev_add_pack(&ipv6_packet_type);
964	return 0;
965}
966
967static void ipv6_packet_cleanup(void)
968{
969	dev_remove_pack(&ipv6_packet_type);
970}
971
972static int __net_init ipv6_init_mibs(struct net *net)
973{
974	if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
975			  sizeof(struct udp_mib),
976			  __alignof__(struct udp_mib)) < 0)
977		return -ENOMEM;
978	if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
979			  sizeof(struct udp_mib),
980			  __alignof__(struct udp_mib)) < 0)
981		goto err_udplite_mib;
982	if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
983			  sizeof(struct ipstats_mib),
984			  __alignof__(struct ipstats_mib)) < 0)
985		goto err_ip_mib;
986	if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
987			  sizeof(struct icmpv6_mib),
988			  __alignof__(struct icmpv6_mib)) < 0)
989		goto err_icmp_mib;
990	if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics,
991			  sizeof(struct icmpv6msg_mib),
992			  __alignof__(struct icmpv6msg_mib)) < 0)
993		goto err_icmpmsg_mib;
994	return 0;
995
996err_icmpmsg_mib:
997	snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
998err_icmp_mib:
999	snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1000err_ip_mib:
1001	snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1002err_udplite_mib:
1003	snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1004	return -ENOMEM;
1005}
1006
1007static void ipv6_cleanup_mibs(struct net *net)
1008{
1009	snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1010	snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1011	snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1012	snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1013	snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics);
1014}
1015
1016static int __net_init inet6_net_init(struct net *net)
1017{
1018	int err = 0;
1019
1020	net->ipv6.sysctl.bindv6only = 0;
1021	net->ipv6.sysctl.icmpv6_time = 1*HZ;
1022
1023	err = ipv6_init_mibs(net);
1024	if (err)
1025		return err;
1026#ifdef CONFIG_PROC_FS
1027	err = udp6_proc_init(net);
1028	if (err)
1029		goto out;
1030	err = tcp6_proc_init(net);
1031	if (err)
1032		goto proc_tcp6_fail;
1033	err = ac6_proc_init(net);
1034	if (err)
1035		goto proc_ac6_fail;
1036#endif
1037	return err;
1038
1039#ifdef CONFIG_PROC_FS
1040proc_ac6_fail:
1041	tcp6_proc_exit(net);
1042proc_tcp6_fail:
1043	udp6_proc_exit(net);
1044out:
1045	ipv6_cleanup_mibs(net);
1046	return err;
1047#endif
1048}
1049
1050static void __net_exit inet6_net_exit(struct net *net)
1051{
1052#ifdef CONFIG_PROC_FS
1053	udp6_proc_exit(net);
1054	tcp6_proc_exit(net);
1055	ac6_proc_exit(net);
1056#endif
1057	ipv6_cleanup_mibs(net);
1058}
1059
1060static struct pernet_operations inet6_net_ops = {
1061	.init = inet6_net_init,
1062	.exit = inet6_net_exit,
1063};
1064
1065static int __init inet6_init(void)
1066{
1067	struct sk_buff *dummy_skb;
1068	struct list_head *r;
1069	int err = 0;
1070
1071	BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1072
1073	/* Register the socket-side information for inet6_create.  */
1074	for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1075		INIT_LIST_HEAD(r);
1076
1077	if (disable_ipv6_mod) {
1078		printk(KERN_INFO
1079		       "IPv6: Loaded, but administratively disabled, "
1080		       "reboot required to enable\n");
1081		goto out;
1082	}
1083
1084	err = proto_register(&tcpv6_prot, 1);
1085	if (err)
1086		goto out;
1087
1088	err = proto_register(&udpv6_prot, 1);
1089	if (err)
1090		goto out_unregister_tcp_proto;
1091
1092	err = proto_register(&udplitev6_prot, 1);
1093	if (err)
1094		goto out_unregister_udp_proto;
1095
1096	err = proto_register(&rawv6_prot, 1);
1097	if (err)
1098		goto out_unregister_udplite_proto;
1099
1100
1101	/* We MUST register RAW sockets before we create the ICMP6,
1102	 * IGMP6, or NDISC control sockets.
1103	 */
1104	err = rawv6_init();
1105	if (err)
1106		goto out_unregister_raw_proto;
1107
1108	/* Register the family here so that the init calls below will
1109	 * be able to create sockets. (?? is this dangerous ??)
1110	 */
1111	err = sock_register(&inet6_family_ops);
1112	if (err)
1113		goto out_sock_register_fail;
1114
1115#ifdef CONFIG_SYSCTL
1116	err = ipv6_static_sysctl_register();
1117	if (err)
1118		goto static_sysctl_fail;
1119#endif
1120	/*
1121	 *	ipngwg API draft makes clear that the correct semantics
1122	 *	for TCP and UDP is to consider one TCP and UDP instance
1123	 *	in a host availiable by both INET and INET6 APIs and
1124	 *	able to communicate via both network protocols.
1125	 */
1126
1127	err = register_pernet_subsys(&inet6_net_ops);
1128	if (err)
1129		goto register_pernet_fail;
1130	err = icmpv6_init();
1131	if (err)
1132		goto icmp_fail;
1133	err = ip6_mr_init();
1134	if (err)
1135		goto ipmr_fail;
1136	err = ndisc_init();
1137	if (err)
1138		goto ndisc_fail;
1139	err = igmp6_init();
1140	if (err)
1141		goto igmp_fail;
1142	err = ipv6_netfilter_init();
1143	if (err)
1144		goto netfilter_fail;
1145	/* Create /proc/foo6 entries. */
1146#ifdef CONFIG_PROC_FS
1147	err = -ENOMEM;
1148	if (raw6_proc_init())
1149		goto proc_raw6_fail;
1150	if (udplite6_proc_init())
1151		goto proc_udplite6_fail;
1152	if (ipv6_misc_proc_init())
1153		goto proc_misc6_fail;
1154	if (if6_proc_init())
1155		goto proc_if6_fail;
1156#endif
1157	err = ip6_route_init();
1158	if (err)
1159		goto ip6_route_fail;
1160	err = ip6_flowlabel_init();
1161	if (err)
1162		goto ip6_flowlabel_fail;
1163	err = addrconf_init();
1164	if (err)
1165		goto addrconf_fail;
1166
1167	/* Init v6 extension headers. */
1168	err = ipv6_exthdrs_init();
1169	if (err)
1170		goto ipv6_exthdrs_fail;
1171
1172	err = ipv6_frag_init();
1173	if (err)
1174		goto ipv6_frag_fail;
1175
1176	/* Init v6 transport protocols. */
1177	err = udpv6_init();
1178	if (err)
1179		goto udpv6_fail;
1180
1181	err = udplitev6_init();
1182	if (err)
1183		goto udplitev6_fail;
1184
1185	err = tcpv6_init();
1186	if (err)
1187		goto tcpv6_fail;
1188
1189	err = ipv6_packet_init();
1190	if (err)
1191		goto ipv6_packet_fail;
1192
1193#ifdef CONFIG_SYSCTL
1194	err = ipv6_sysctl_register();
1195	if (err)
1196		goto sysctl_fail;
1197#endif
1198out:
1199	return err;
1200
1201#ifdef CONFIG_SYSCTL
1202sysctl_fail:
1203	ipv6_packet_cleanup();
1204#endif
1205ipv6_packet_fail:
1206	tcpv6_exit();
1207tcpv6_fail:
1208	udplitev6_exit();
1209udplitev6_fail:
1210	udpv6_exit();
1211udpv6_fail:
1212	ipv6_frag_exit();
1213ipv6_frag_fail:
1214	ipv6_exthdrs_exit();
1215ipv6_exthdrs_fail:
1216	addrconf_cleanup();
1217addrconf_fail:
1218	ip6_flowlabel_cleanup();
1219ip6_flowlabel_fail:
1220	ip6_route_cleanup();
1221ip6_route_fail:
1222#ifdef CONFIG_PROC_FS
1223	if6_proc_exit();
1224proc_if6_fail:
1225	ipv6_misc_proc_exit();
1226proc_misc6_fail:
1227	udplite6_proc_exit();
1228proc_udplite6_fail:
1229	raw6_proc_exit();
1230proc_raw6_fail:
1231#endif
1232	ipv6_netfilter_fini();
1233netfilter_fail:
1234	igmp6_cleanup();
1235igmp_fail:
1236	ndisc_cleanup();
1237ndisc_fail:
1238	ip6_mr_cleanup();
1239ipmr_fail:
1240	icmpv6_cleanup();
1241icmp_fail:
1242	unregister_pernet_subsys(&inet6_net_ops);
1243register_pernet_fail:
1244#ifdef CONFIG_SYSCTL
1245	ipv6_static_sysctl_unregister();
1246static_sysctl_fail:
1247#endif
1248	sock_unregister(PF_INET6);
1249	rtnl_unregister_all(PF_INET6);
1250out_sock_register_fail:
1251	rawv6_exit();
1252out_unregister_raw_proto:
1253	proto_unregister(&rawv6_prot);
1254out_unregister_udplite_proto:
1255	proto_unregister(&udplitev6_prot);
1256out_unregister_udp_proto:
1257	proto_unregister(&udpv6_prot);
1258out_unregister_tcp_proto:
1259	proto_unregister(&tcpv6_prot);
1260	goto out;
1261}
1262module_init(inet6_init);
1263
1264static void __exit inet6_exit(void)
1265{
1266	if (disable_ipv6_mod)
1267		return;
1268
1269	/* First of all disallow new sockets creation. */
1270	sock_unregister(PF_INET6);
1271	/* Disallow any further netlink messages */
1272	rtnl_unregister_all(PF_INET6);
1273
1274#ifdef CONFIG_SYSCTL
1275	ipv6_sysctl_unregister();
1276#endif
1277	udpv6_exit();
1278	udplitev6_exit();
1279	tcpv6_exit();
1280
1281	/* Cleanup code parts. */
1282	ipv6_packet_cleanup();
1283	ipv6_frag_exit();
1284	ipv6_exthdrs_exit();
1285	addrconf_cleanup();
1286	ip6_flowlabel_cleanup();
1287	ip6_route_cleanup();
1288#ifdef CONFIG_PROC_FS
1289
1290	/* Cleanup code parts. */
1291	if6_proc_exit();
1292	ipv6_misc_proc_exit();
1293	udplite6_proc_exit();
1294	raw6_proc_exit();
1295#endif
1296	ipv6_netfilter_fini();
1297	igmp6_cleanup();
1298	ndisc_cleanup();
1299	ip6_mr_cleanup();
1300	icmpv6_cleanup();
1301	rawv6_exit();
1302
1303	unregister_pernet_subsys(&inet6_net_ops);
1304#ifdef CONFIG_SYSCTL
1305	ipv6_static_sysctl_unregister();
1306#endif
1307	proto_unregister(&rawv6_prot);
1308	proto_unregister(&udplitev6_prot);
1309	proto_unregister(&udpv6_prot);
1310	proto_unregister(&tcpv6_prot);
1311
1312	rcu_barrier(); /* Wait for completion of call_rcu()'s */
1313}
1314module_exit(inet6_exit);
1315
1316MODULE_ALIAS_NETPROTO(PF_INET6);
1317