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 (!ipv6_chk_addr(net, &addr->sin6_addr,
347						   dev, 0)) {
348					err = -EADDRNOTAVAIL;
349					goto out_unlock;
350				}
351			}
352			rcu_read_unlock();
353		}
354	}
355
356	inet->inet_rcv_saddr = v4addr;
357	inet->inet_saddr = v4addr;
358
359	ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
360
361	if (!(addr_type & IPV6_ADDR_MULTICAST))
362		ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
363
364	/* Make sure we are allowed to bind here. */
365	if (sk->sk_prot->get_port(sk, snum)) {
366		inet_reset_saddr(sk);
367		err = -EADDRINUSE;
368		goto out;
369	}
370
371	if (addr_type != IPV6_ADDR_ANY) {
372		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
373		if (addr_type != IPV6_ADDR_MAPPED)
374			np->ipv6only = 1;
375	}
376	if (snum)
377		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
378	inet->inet_sport = htons(inet->inet_num);
379	inet->inet_dport = 0;
380	inet->inet_daddr = 0;
381out:
382	release_sock(sk);
383	return err;
384out_unlock:
385	rcu_read_unlock();
386	goto out;
387}
388
389EXPORT_SYMBOL(inet6_bind);
390
391int inet6_release(struct socket *sock)
392{
393	struct sock *sk = sock->sk;
394
395	if (sk == NULL)
396		return -EINVAL;
397
398	/* Free mc lists */
399	ipv6_sock_mc_close(sk);
400
401	/* Free ac lists */
402	ipv6_sock_ac_close(sk);
403
404	return inet_release(sock);
405}
406
407EXPORT_SYMBOL(inet6_release);
408
409void inet6_destroy_sock(struct sock *sk)
410{
411	struct ipv6_pinfo *np = inet6_sk(sk);
412	struct sk_buff *skb;
413	struct ipv6_txoptions *opt;
414
415	/* Release rx options */
416
417	if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
418		kfree_skb(skb);
419
420	if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
421		kfree_skb(skb);
422
423	/* Free flowlabels */
424	fl6_free_socklist(sk);
425
426	/* Free tx options */
427
428	if ((opt = xchg(&np->opt, NULL)) != NULL)
429		sock_kfree_s(sk, opt, opt->tot_len);
430}
431
432EXPORT_SYMBOL_GPL(inet6_destroy_sock);
433
434/*
435 *	This does both peername and sockname.
436 */
437
438int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
439		 int *uaddr_len, int peer)
440{
441	struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
442	struct sock *sk = sock->sk;
443	struct inet_sock *inet = inet_sk(sk);
444	struct ipv6_pinfo *np = inet6_sk(sk);
445
446	sin->sin6_family = AF_INET6;
447	sin->sin6_flowinfo = 0;
448	sin->sin6_scope_id = 0;
449	if (peer) {
450		if (!inet->inet_dport)
451			return -ENOTCONN;
452		if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
453		    peer == 1)
454			return -ENOTCONN;
455		sin->sin6_port = inet->inet_dport;
456		ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
457		if (np->sndflow)
458			sin->sin6_flowinfo = np->flow_label;
459	} else {
460		if (ipv6_addr_any(&np->rcv_saddr))
461			ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
462		else
463			ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
464
465		sin->sin6_port = inet->inet_sport;
466	}
467	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
468		sin->sin6_scope_id = sk->sk_bound_dev_if;
469	*uaddr_len = sizeof(*sin);
470	return(0);
471}
472
473EXPORT_SYMBOL(inet6_getname);
474
475int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
476{
477	struct sock *sk = sock->sk;
478	struct net *net = sock_net(sk);
479
480	switch(cmd)
481	{
482	case SIOCGSTAMP:
483		return sock_get_timestamp(sk, (struct timeval __user *)arg);
484
485	case SIOCGSTAMPNS:
486		return sock_get_timestampns(sk, (struct timespec __user *)arg);
487
488	case SIOCADDRT:
489	case SIOCDELRT:
490
491		return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
492
493	case SIOCSIFADDR:
494		return addrconf_add_ifaddr(net, (void __user *) arg);
495	case SIOCDIFADDR:
496		return addrconf_del_ifaddr(net, (void __user *) arg);
497	case SIOCSIFDSTADDR:
498		return addrconf_set_dstaddr(net, (void __user *) arg);
499	default:
500		if (!sk->sk_prot->ioctl)
501			return -ENOIOCTLCMD;
502		return sk->sk_prot->ioctl(sk, cmd, arg);
503	}
504	/*NOTREACHED*/
505	return(0);
506}
507
508EXPORT_SYMBOL(inet6_ioctl);
509
510const struct proto_ops inet6_stream_ops = {
511	.family		   = PF_INET6,
512	.owner		   = THIS_MODULE,
513	.release	   = inet6_release,
514	.bind		   = inet6_bind,
515	.connect	   = inet_stream_connect,	/* ok		*/
516	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
517	.accept		   = inet_accept,		/* ok		*/
518	.getname	   = inet6_getname,
519	.poll		   = tcp_poll,			/* ok		*/
520	.ioctl		   = inet6_ioctl,		/* must change  */
521	.listen		   = inet_listen,		/* ok		*/
522	.shutdown	   = inet_shutdown,		/* ok		*/
523	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
524	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
525	.sendmsg	   = inet_sendmsg,		/* ok		*/
526	.recvmsg	   = inet_recvmsg,		/* ok		*/
527	.mmap		   = sock_no_mmap,
528	.sendpage	   = inet_sendpage,
529	.splice_read	   = tcp_splice_read,
530#ifdef CONFIG_COMPAT
531	.compat_setsockopt = compat_sock_common_setsockopt,
532	.compat_getsockopt = compat_sock_common_getsockopt,
533#endif
534};
535
536const struct proto_ops inet6_dgram_ops = {
537	.family		   = PF_INET6,
538	.owner		   = THIS_MODULE,
539	.release	   = inet6_release,
540	.bind		   = inet6_bind,
541	.connect	   = inet_dgram_connect,	/* ok		*/
542	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
543	.accept		   = sock_no_accept,		/* a do nothing	*/
544	.getname	   = inet6_getname,
545	.poll		   = udp_poll,			/* ok		*/
546	.ioctl		   = inet6_ioctl,		/* must change  */
547	.listen		   = sock_no_listen,		/* ok		*/
548	.shutdown	   = inet_shutdown,		/* ok		*/
549	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
550	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
551	.sendmsg	   = inet_sendmsg,		/* ok		*/
552	.recvmsg	   = inet_recvmsg,		/* ok		*/
553	.mmap		   = sock_no_mmap,
554	.sendpage	   = sock_no_sendpage,
555#ifdef CONFIG_COMPAT
556	.compat_setsockopt = compat_sock_common_setsockopt,
557	.compat_getsockopt = compat_sock_common_getsockopt,
558#endif
559};
560
561static const struct net_proto_family inet6_family_ops = {
562	.family = PF_INET6,
563	.create = inet6_create,
564	.owner	= THIS_MODULE,
565};
566
567int inet6_register_protosw(struct inet_protosw *p)
568{
569	struct list_head *lh;
570	struct inet_protosw *answer;
571	struct list_head *last_perm;
572	int protocol = p->protocol;
573	int ret;
574
575	spin_lock_bh(&inetsw6_lock);
576
577	ret = -EINVAL;
578	if (p->type >= SOCK_MAX)
579		goto out_illegal;
580
581	/* If we are trying to override a permanent protocol, bail. */
582	answer = NULL;
583	ret = -EPERM;
584	last_perm = &inetsw6[p->type];
585	list_for_each(lh, &inetsw6[p->type]) {
586		answer = list_entry(lh, struct inet_protosw, list);
587
588		/* Check only the non-wild match. */
589		if (INET_PROTOSW_PERMANENT & answer->flags) {
590			if (protocol == answer->protocol)
591				break;
592			last_perm = lh;
593		}
594
595		answer = NULL;
596	}
597	if (answer)
598		goto out_permanent;
599
600	/* Add the new entry after the last permanent entry if any, so that
601	 * the new entry does not override a permanent entry when matched with
602	 * a wild-card protocol. But it is allowed to override any existing
603	 * non-permanent entry.  This means that when we remove this entry, the
604	 * system automatically returns to the old behavior.
605	 */
606	list_add_rcu(&p->list, last_perm);
607	ret = 0;
608out:
609	spin_unlock_bh(&inetsw6_lock);
610	return ret;
611
612out_permanent:
613	printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
614	       protocol);
615	goto out;
616
617out_illegal:
618	printk(KERN_ERR
619	       "Ignoring attempt to register invalid socket type %d.\n",
620	       p->type);
621	goto out;
622}
623
624EXPORT_SYMBOL(inet6_register_protosw);
625
626void
627inet6_unregister_protosw(struct inet_protosw *p)
628{
629	if (INET_PROTOSW_PERMANENT & p->flags) {
630		printk(KERN_ERR
631		       "Attempt to unregister permanent protocol %d.\n",
632		       p->protocol);
633	} else {
634		spin_lock_bh(&inetsw6_lock);
635		list_del_rcu(&p->list);
636		spin_unlock_bh(&inetsw6_lock);
637
638		synchronize_net();
639	}
640}
641
642EXPORT_SYMBOL(inet6_unregister_protosw);
643
644int inet6_sk_rebuild_header(struct sock *sk)
645{
646	int err;
647	struct dst_entry *dst;
648	struct ipv6_pinfo *np = inet6_sk(sk);
649
650	dst = __sk_dst_check(sk, np->dst_cookie);
651
652	if (dst == NULL) {
653		struct inet_sock *inet = inet_sk(sk);
654		struct in6_addr *final_p, final;
655		struct flowi fl;
656
657		memset(&fl, 0, sizeof(fl));
658		fl.proto = sk->sk_protocol;
659		ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
660		ipv6_addr_copy(&fl.fl6_src, &np->saddr);
661		fl.fl6_flowlabel = np->flow_label;
662		fl.oif = sk->sk_bound_dev_if;
663		fl.mark = sk->sk_mark;
664		fl.fl_ip_dport = inet->inet_dport;
665		fl.fl_ip_sport = inet->inet_sport;
666		security_sk_classify_flow(sk, &fl);
667
668		final_p = fl6_update_dst(&fl, np->opt, &final);
669
670		err = ip6_dst_lookup(sk, &dst, &fl);
671		if (err) {
672			sk->sk_route_caps = 0;
673			return err;
674		}
675		if (final_p)
676			ipv6_addr_copy(&fl.fl6_dst, final_p);
677
678		if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
679			sk->sk_err_soft = -err;
680			return err;
681		}
682
683		__ip6_dst_store(sk, dst, NULL, NULL);
684	}
685
686	return 0;
687}
688
689EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
690
691int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
692{
693	struct ipv6_pinfo *np = inet6_sk(sk);
694	struct inet6_skb_parm *opt = IP6CB(skb);
695
696	if (np->rxopt.all) {
697		if ((opt->hop && (np->rxopt.bits.hopopts ||
698				  np->rxopt.bits.ohopopts)) ||
699		    ((IPV6_FLOWINFO_MASK &
700		      *(__be32 *)skb_network_header(skb)) &&
701		     np->rxopt.bits.rxflow) ||
702		    (opt->srcrt && (np->rxopt.bits.srcrt ||
703		     np->rxopt.bits.osrcrt)) ||
704		    ((opt->dst1 || opt->dst0) &&
705		     (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
706			return 1;
707	}
708	return 0;
709}
710
711EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
712
713static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
714{
715	const struct inet6_protocol *ops = NULL;
716
717	for (;;) {
718		struct ipv6_opt_hdr *opth;
719		int len;
720
721		if (proto != NEXTHDR_HOP) {
722			ops = rcu_dereference(inet6_protos[proto]);
723
724			if (unlikely(!ops))
725				break;
726
727			if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
728				break;
729		}
730
731		if (unlikely(!pskb_may_pull(skb, 8)))
732			break;
733
734		opth = (void *)skb->data;
735		len = ipv6_optlen(opth);
736
737		if (unlikely(!pskb_may_pull(skb, len)))
738			break;
739
740		proto = opth->nexthdr;
741		__skb_pull(skb, len);
742	}
743
744	return proto;
745}
746
747static int ipv6_gso_send_check(struct sk_buff *skb)
748{
749	struct ipv6hdr *ipv6h;
750	const struct inet6_protocol *ops;
751	int err = -EINVAL;
752
753	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
754		goto out;
755
756	ipv6h = ipv6_hdr(skb);
757	__skb_pull(skb, sizeof(*ipv6h));
758	err = -EPROTONOSUPPORT;
759
760	rcu_read_lock();
761	ops = rcu_dereference(inet6_protos[
762		ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
763
764	if (likely(ops && ops->gso_send_check)) {
765		skb_reset_transport_header(skb);
766		err = ops->gso_send_check(skb);
767	}
768	rcu_read_unlock();
769
770out:
771	return err;
772}
773
774static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
775{
776	struct sk_buff *segs = ERR_PTR(-EINVAL);
777	struct ipv6hdr *ipv6h;
778	const struct inet6_protocol *ops;
779	int proto;
780	struct frag_hdr *fptr;
781	unsigned int unfrag_ip6hlen;
782	u8 *prevhdr;
783	int offset = 0;
784
785	if (!(features & NETIF_F_V6_CSUM))
786		features &= ~NETIF_F_SG;
787
788	if (unlikely(skb_shinfo(skb)->gso_type &
789		     ~(SKB_GSO_UDP |
790		       SKB_GSO_DODGY |
791		       SKB_GSO_TCP_ECN |
792		       SKB_GSO_TCPV6 |
793		       0)))
794		goto out;
795
796	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
797		goto out;
798
799	ipv6h = ipv6_hdr(skb);
800	__skb_pull(skb, sizeof(*ipv6h));
801	segs = ERR_PTR(-EPROTONOSUPPORT);
802
803	proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
804	rcu_read_lock();
805	ops = rcu_dereference(inet6_protos[proto]);
806	if (likely(ops && ops->gso_segment)) {
807		skb_reset_transport_header(skb);
808		segs = ops->gso_segment(skb, features);
809	}
810	rcu_read_unlock();
811
812	if (unlikely(IS_ERR(segs)))
813		goto out;
814
815	for (skb = segs; skb; skb = skb->next) {
816		ipv6h = ipv6_hdr(skb);
817		ipv6h->payload_len = htons(skb->len - skb->mac_len -
818					   sizeof(*ipv6h));
819		if (proto == IPPROTO_UDP) {
820			unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
821			fptr = (struct frag_hdr *)(skb_network_header(skb) +
822				unfrag_ip6hlen);
823			fptr->frag_off = htons(offset);
824			if (skb->next != NULL)
825				fptr->frag_off |= htons(IP6_MF);
826			offset += (ntohs(ipv6h->payload_len) -
827				   sizeof(struct frag_hdr));
828		}
829	}
830
831out:
832	return segs;
833}
834
835struct ipv6_gro_cb {
836	struct napi_gro_cb napi;
837	int proto;
838};
839
840#define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
841
842static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
843					 struct sk_buff *skb)
844{
845	const struct inet6_protocol *ops;
846	struct sk_buff **pp = NULL;
847	struct sk_buff *p;
848	struct ipv6hdr *iph;
849	unsigned int nlen;
850	unsigned int hlen;
851	unsigned int off;
852	int flush = 1;
853	int proto;
854	__wsum csum;
855
856	off = skb_gro_offset(skb);
857	hlen = off + sizeof(*iph);
858	iph = skb_gro_header_fast(skb, off);
859	if (skb_gro_header_hard(skb, hlen)) {
860		iph = skb_gro_header_slow(skb, hlen, off);
861		if (unlikely(!iph))
862			goto out;
863	}
864
865	skb_gro_pull(skb, sizeof(*iph));
866	skb_set_transport_header(skb, skb_gro_offset(skb));
867
868	flush += ntohs(iph->payload_len) != skb_gro_len(skb);
869
870	rcu_read_lock();
871	proto = iph->nexthdr;
872	ops = rcu_dereference(inet6_protos[proto]);
873	if (!ops || !ops->gro_receive) {
874		__pskb_pull(skb, skb_gro_offset(skb));
875		proto = ipv6_gso_pull_exthdrs(skb, proto);
876		skb_gro_pull(skb, -skb_transport_offset(skb));
877		skb_reset_transport_header(skb);
878		__skb_push(skb, skb_gro_offset(skb));
879
880		if (!ops || !ops->gro_receive)
881			goto out_unlock;
882
883		iph = ipv6_hdr(skb);
884	}
885
886	IPV6_GRO_CB(skb)->proto = proto;
887
888	flush--;
889	nlen = skb_network_header_len(skb);
890
891	for (p = *head; p; p = p->next) {
892		struct ipv6hdr *iph2;
893
894		if (!NAPI_GRO_CB(p)->same_flow)
895			continue;
896
897		iph2 = ipv6_hdr(p);
898
899		/* All fields must match except length. */
900		if (nlen != skb_network_header_len(p) ||
901		    memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
902		    memcmp(&iph->nexthdr, &iph2->nexthdr,
903			   nlen - offsetof(struct ipv6hdr, nexthdr))) {
904			NAPI_GRO_CB(p)->same_flow = 0;
905			continue;
906		}
907
908		NAPI_GRO_CB(p)->flush |= flush;
909	}
910
911	NAPI_GRO_CB(skb)->flush |= flush;
912
913	csum = skb->csum;
914	skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
915
916	pp = ops->gro_receive(head, skb);
917
918	skb->csum = csum;
919
920out_unlock:
921	rcu_read_unlock();
922
923out:
924	NAPI_GRO_CB(skb)->flush |= flush;
925
926	return pp;
927}
928
929static int ipv6_gro_complete(struct sk_buff *skb)
930{
931	const struct inet6_protocol *ops;
932	struct ipv6hdr *iph = ipv6_hdr(skb);
933	int err = -ENOSYS;
934
935	iph->payload_len = htons(skb->len - skb_network_offset(skb) -
936				 sizeof(*iph));
937
938	rcu_read_lock();
939	ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
940	if (WARN_ON(!ops || !ops->gro_complete))
941		goto out_unlock;
942
943	err = ops->gro_complete(skb);
944
945out_unlock:
946	rcu_read_unlock();
947
948	return err;
949}
950
951static struct packet_type ipv6_packet_type __read_mostly = {
952	.type = cpu_to_be16(ETH_P_IPV6),
953	.func = ipv6_rcv,
954	.gso_send_check = ipv6_gso_send_check,
955	.gso_segment = ipv6_gso_segment,
956	.gro_receive = ipv6_gro_receive,
957	.gro_complete = ipv6_gro_complete,
958};
959
960static int __init ipv6_packet_init(void)
961{
962	dev_add_pack(&ipv6_packet_type);
963	return 0;
964}
965
966static void ipv6_packet_cleanup(void)
967{
968	dev_remove_pack(&ipv6_packet_type);
969}
970
971static int __net_init ipv6_init_mibs(struct net *net)
972{
973	if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
974			  sizeof(struct udp_mib),
975			  __alignof__(struct udp_mib)) < 0)
976		return -ENOMEM;
977	if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
978			  sizeof(struct udp_mib),
979			  __alignof__(struct udp_mib)) < 0)
980		goto err_udplite_mib;
981	if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
982			  sizeof(struct ipstats_mib),
983			  __alignof__(struct ipstats_mib)) < 0)
984		goto err_ip_mib;
985	if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
986			  sizeof(struct icmpv6_mib),
987			  __alignof__(struct icmpv6_mib)) < 0)
988		goto err_icmp_mib;
989	if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics,
990			  sizeof(struct icmpv6msg_mib),
991			  __alignof__(struct icmpv6msg_mib)) < 0)
992		goto err_icmpmsg_mib;
993	return 0;
994
995err_icmpmsg_mib:
996	snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
997err_icmp_mib:
998	snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
999err_ip_mib:
1000	snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1001err_udplite_mib:
1002	snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1003	return -ENOMEM;
1004}
1005
1006static void ipv6_cleanup_mibs(struct net *net)
1007{
1008	snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1009	snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1010	snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1011	snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1012	snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics);
1013}
1014
1015static int __net_init inet6_net_init(struct net *net)
1016{
1017	int err = 0;
1018
1019	net->ipv6.sysctl.bindv6only = 0;
1020	net->ipv6.sysctl.icmpv6_time = 1*HZ;
1021
1022	err = ipv6_init_mibs(net);
1023	if (err)
1024		return err;
1025#ifdef CONFIG_PROC_FS
1026	err = udp6_proc_init(net);
1027	if (err)
1028		goto out;
1029	err = tcp6_proc_init(net);
1030	if (err)
1031		goto proc_tcp6_fail;
1032	err = ac6_proc_init(net);
1033	if (err)
1034		goto proc_ac6_fail;
1035#endif
1036	return err;
1037
1038#ifdef CONFIG_PROC_FS
1039proc_ac6_fail:
1040	tcp6_proc_exit(net);
1041proc_tcp6_fail:
1042	udp6_proc_exit(net);
1043out:
1044	ipv6_cleanup_mibs(net);
1045	return err;
1046#endif
1047}
1048
1049static void __net_exit inet6_net_exit(struct net *net)
1050{
1051#ifdef CONFIG_PROC_FS
1052	udp6_proc_exit(net);
1053	tcp6_proc_exit(net);
1054	ac6_proc_exit(net);
1055#endif
1056	ipv6_cleanup_mibs(net);
1057}
1058
1059static struct pernet_operations inet6_net_ops = {
1060	.init = inet6_net_init,
1061	.exit = inet6_net_exit,
1062};
1063
1064static int __init inet6_init(void)
1065{
1066	struct sk_buff *dummy_skb;
1067	struct list_head *r;
1068	int err = 0;
1069
1070	BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1071
1072	/* Register the socket-side information for inet6_create.  */
1073	for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1074		INIT_LIST_HEAD(r);
1075
1076	if (disable_ipv6_mod) {
1077		printk(KERN_INFO
1078		       "IPv6: Loaded, but administratively disabled, "
1079		       "reboot required to enable\n");
1080		goto out;
1081	}
1082
1083	err = proto_register(&tcpv6_prot, 1);
1084	if (err)
1085		goto out;
1086
1087	err = proto_register(&udpv6_prot, 1);
1088	if (err)
1089		goto out_unregister_tcp_proto;
1090
1091	err = proto_register(&udplitev6_prot, 1);
1092	if (err)
1093		goto out_unregister_udp_proto;
1094
1095	err = proto_register(&rawv6_prot, 1);
1096	if (err)
1097		goto out_unregister_udplite_proto;
1098
1099
1100	/* We MUST register RAW sockets before we create the ICMP6,
1101	 * IGMP6, or NDISC control sockets.
1102	 */
1103	err = rawv6_init();
1104	if (err)
1105		goto out_unregister_raw_proto;
1106
1107	/* Register the family here so that the init calls below will
1108	 * be able to create sockets. (?? is this dangerous ??)
1109	 */
1110	err = sock_register(&inet6_family_ops);
1111	if (err)
1112		goto out_sock_register_fail;
1113
1114#ifdef CONFIG_SYSCTL
1115	err = ipv6_static_sysctl_register();
1116	if (err)
1117		goto static_sysctl_fail;
1118#endif
1119	/*
1120	 *	ipngwg API draft makes clear that the correct semantics
1121	 *	for TCP and UDP is to consider one TCP and UDP instance
1122	 *	in a host availiable by both INET and INET6 APIs and
1123	 *	able to communicate via both network protocols.
1124	 */
1125
1126	err = register_pernet_subsys(&inet6_net_ops);
1127	if (err)
1128		goto register_pernet_fail;
1129	err = icmpv6_init();
1130	if (err)
1131		goto icmp_fail;
1132	err = ip6_mr_init();
1133	if (err)
1134		goto ipmr_fail;
1135	err = ndisc_init();
1136	if (err)
1137		goto ndisc_fail;
1138	err = igmp6_init();
1139	if (err)
1140		goto igmp_fail;
1141	err = ipv6_netfilter_init();
1142	if (err)
1143		goto netfilter_fail;
1144	/* Create /proc/foo6 entries. */
1145#ifdef CONFIG_PROC_FS
1146	err = -ENOMEM;
1147	if (raw6_proc_init())
1148		goto proc_raw6_fail;
1149	if (udplite6_proc_init())
1150		goto proc_udplite6_fail;
1151	if (ipv6_misc_proc_init())
1152		goto proc_misc6_fail;
1153	if (if6_proc_init())
1154		goto proc_if6_fail;
1155#endif
1156	err = ip6_route_init();
1157	if (err)
1158		goto ip6_route_fail;
1159	err = ip6_flowlabel_init();
1160	if (err)
1161		goto ip6_flowlabel_fail;
1162	err = addrconf_init();
1163	if (err)
1164		goto addrconf_fail;
1165
1166	/* Init v6 extension headers. */
1167	err = ipv6_exthdrs_init();
1168	if (err)
1169		goto ipv6_exthdrs_fail;
1170
1171	err = ipv6_frag_init();
1172	if (err)
1173		goto ipv6_frag_fail;
1174
1175	/* Init v6 transport protocols. */
1176	err = udpv6_init();
1177	if (err)
1178		goto udpv6_fail;
1179
1180	err = udplitev6_init();
1181	if (err)
1182		goto udplitev6_fail;
1183
1184	err = tcpv6_init();
1185	if (err)
1186		goto tcpv6_fail;
1187
1188	err = ipv6_packet_init();
1189	if (err)
1190		goto ipv6_packet_fail;
1191
1192#ifdef CONFIG_SYSCTL
1193	err = ipv6_sysctl_register();
1194	if (err)
1195		goto sysctl_fail;
1196#endif
1197out:
1198	return err;
1199
1200#ifdef CONFIG_SYSCTL
1201sysctl_fail:
1202	ipv6_packet_cleanup();
1203#endif
1204ipv6_packet_fail:
1205	tcpv6_exit();
1206tcpv6_fail:
1207	udplitev6_exit();
1208udplitev6_fail:
1209	udpv6_exit();
1210udpv6_fail:
1211	ipv6_frag_exit();
1212ipv6_frag_fail:
1213	ipv6_exthdrs_exit();
1214ipv6_exthdrs_fail:
1215	addrconf_cleanup();
1216addrconf_fail:
1217	ip6_flowlabel_cleanup();
1218ip6_flowlabel_fail:
1219	ip6_route_cleanup();
1220ip6_route_fail:
1221#ifdef CONFIG_PROC_FS
1222	if6_proc_exit();
1223proc_if6_fail:
1224	ipv6_misc_proc_exit();
1225proc_misc6_fail:
1226	udplite6_proc_exit();
1227proc_udplite6_fail:
1228	raw6_proc_exit();
1229proc_raw6_fail:
1230#endif
1231	ipv6_netfilter_fini();
1232netfilter_fail:
1233	igmp6_cleanup();
1234igmp_fail:
1235	ndisc_cleanup();
1236ndisc_fail:
1237	ip6_mr_cleanup();
1238ipmr_fail:
1239	icmpv6_cleanup();
1240icmp_fail:
1241	unregister_pernet_subsys(&inet6_net_ops);
1242register_pernet_fail:
1243#ifdef CONFIG_SYSCTL
1244	ipv6_static_sysctl_unregister();
1245static_sysctl_fail:
1246#endif
1247	sock_unregister(PF_INET6);
1248	rtnl_unregister_all(PF_INET6);
1249out_sock_register_fail:
1250	rawv6_exit();
1251out_unregister_raw_proto:
1252	proto_unregister(&rawv6_prot);
1253out_unregister_udplite_proto:
1254	proto_unregister(&udplitev6_prot);
1255out_unregister_udp_proto:
1256	proto_unregister(&udpv6_prot);
1257out_unregister_tcp_proto:
1258	proto_unregister(&tcpv6_prot);
1259	goto out;
1260}
1261module_init(inet6_init);
1262
1263static void __exit inet6_exit(void)
1264{
1265	if (disable_ipv6_mod)
1266		return;
1267
1268	/* First of all disallow new sockets creation. */
1269	sock_unregister(PF_INET6);
1270	/* Disallow any further netlink messages */
1271	rtnl_unregister_all(PF_INET6);
1272
1273#ifdef CONFIG_SYSCTL
1274	ipv6_sysctl_unregister();
1275#endif
1276	udpv6_exit();
1277	udplitev6_exit();
1278	tcpv6_exit();
1279
1280	/* Cleanup code parts. */
1281	ipv6_packet_cleanup();
1282	ipv6_frag_exit();
1283	ipv6_exthdrs_exit();
1284	addrconf_cleanup();
1285	ip6_flowlabel_cleanup();
1286	ip6_route_cleanup();
1287#ifdef CONFIG_PROC_FS
1288
1289	/* Cleanup code parts. */
1290	if6_proc_exit();
1291	ipv6_misc_proc_exit();
1292	udplite6_proc_exit();
1293	raw6_proc_exit();
1294#endif
1295	ipv6_netfilter_fini();
1296	igmp6_cleanup();
1297	ndisc_cleanup();
1298	ip6_mr_cleanup();
1299	icmpv6_cleanup();
1300	rawv6_exit();
1301
1302	unregister_pernet_subsys(&inet6_net_ops);
1303#ifdef CONFIG_SYSCTL
1304	ipv6_static_sysctl_unregister();
1305#endif
1306	proto_unregister(&rawv6_prot);
1307	proto_unregister(&udplitev6_prot);
1308	proto_unregister(&udpv6_prot);
1309	proto_unregister(&tcpv6_prot);
1310
1311	rcu_barrier(); /* Wait for completion of call_rcu()'s */
1312}
1313module_exit(inet6_exit);
1314
1315MODULE_ALIAS_NETPROTO(PF_INET6);
1316