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/ping.h>
53#include <net/protocol.h>
54#include <net/inet_common.h>
55#include <net/route.h>
56#include <net/transp_v6.h>
57#include <net/ip6_route.h>
58#include <net/addrconf.h>
59#ifdef CONFIG_IPV6_TUNNEL
60#include <net/ip6_tunnel.h>
61#endif
62
63#include <asm/uaccess.h>
64#include <linux/mroute6.h>
65
66#ifdef CONFIG_ANDROID_PARANOID_NETWORK
67#include <linux/android_aid.h>
68
69static inline int current_has_network(void)
70{
71	return in_egroup_p(AID_INET) || capable(CAP_NET_RAW);
72}
73#else
74static inline int current_has_network(void)
75{
76	return 1;
77}
78#endif
79
80MODULE_AUTHOR("Cast of dozens");
81MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
82MODULE_LICENSE("GPL");
83
84/* The inetsw6 table contains everything that inet6_create needs to
85 * build a new socket.
86 */
87static struct list_head inetsw6[SOCK_MAX];
88static DEFINE_SPINLOCK(inetsw6_lock);
89
90struct ipv6_params ipv6_defaults = {
91	.disable_ipv6 = 0,
92	.autoconf = 1,
93};
94
95static int disable_ipv6_mod;
96
97module_param_named(disable, disable_ipv6_mod, int, 0444);
98MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
99
100module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
101MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
102
103module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
104MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
105
106static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
107{
108	const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
109
110	return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
111}
112
113static int inet6_create(struct net *net, struct socket *sock, int protocol,
114			int kern)
115{
116	struct inet_sock *inet;
117	struct ipv6_pinfo *np;
118	struct sock *sk;
119	struct inet_protosw *answer;
120	struct proto *answer_prot;
121	unsigned char answer_flags;
122	char answer_no_check;
123	int try_loading_module = 0;
124	int err;
125
126	if (!current_has_network())
127		return -EACCES;
128
129	if (sock->type != SOCK_RAW &&
130	    sock->type != SOCK_DGRAM &&
131	    !inet_ehash_secret)
132		build_ehash_secret();
133
134	/* Look for the requested type/protocol pair. */
135lookup_protocol:
136	err = -ESOCKTNOSUPPORT;
137	rcu_read_lock();
138	list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
139
140		err = 0;
141		/* Check the non-wild match. */
142		if (protocol == answer->protocol) {
143			if (protocol != IPPROTO_IP)
144				break;
145		} else {
146			/* Check for the two wild cases. */
147			if (IPPROTO_IP == protocol) {
148				protocol = answer->protocol;
149				break;
150			}
151			if (IPPROTO_IP == answer->protocol)
152				break;
153		}
154		err = -EPROTONOSUPPORT;
155	}
156
157	if (err) {
158		if (try_loading_module < 2) {
159			rcu_read_unlock();
160			/*
161			 * Be more specific, e.g. net-pf-10-proto-132-type-1
162			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
163			 */
164			if (++try_loading_module == 1)
165				request_module("net-pf-%d-proto-%d-type-%d",
166						PF_INET6, protocol, sock->type);
167			/*
168			 * Fall back to generic, e.g. net-pf-10-proto-132
169			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
170			 */
171			else
172				request_module("net-pf-%d-proto-%d",
173						PF_INET6, protocol);
174			goto lookup_protocol;
175		} else
176			goto out_rcu_unlock;
177	}
178
179	err = -EPERM;
180	if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
181		goto out_rcu_unlock;
182
183	sock->ops = answer->ops;
184	answer_prot = answer->prot;
185	answer_no_check = answer->no_check;
186	answer_flags = answer->flags;
187	rcu_read_unlock();
188
189	WARN_ON(answer_prot->slab == NULL);
190
191	err = -ENOBUFS;
192	sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
193	if (sk == NULL)
194		goto out;
195
196	sock_init_data(sock, sk);
197
198	err = 0;
199	sk->sk_no_check = answer_no_check;
200	if (INET_PROTOSW_REUSE & answer_flags)
201		sk->sk_reuse = SK_CAN_REUSE;
202
203	inet = inet_sk(sk);
204	inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
205
206	if (SOCK_RAW == sock->type) {
207		inet->inet_num = protocol;
208		if (IPPROTO_RAW == protocol)
209			inet->hdrincl = 1;
210	}
211
212	sk->sk_destruct		= inet_sock_destruct;
213	sk->sk_family		= PF_INET6;
214	sk->sk_protocol		= protocol;
215
216	sk->sk_backlog_rcv	= answer->prot->backlog_rcv;
217
218	inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
219	np->hop_limit	= -1;
220	np->mcast_hops	= IPV6_DEFAULT_MCASTHOPS;
221	np->mc_loop	= 1;
222	np->pmtudisc	= IPV6_PMTUDISC_WANT;
223	np->ipv6only	= net->ipv6.sysctl.bindv6only;
224
225	/* Init the ipv4 part of the socket since we can have sockets
226	 * using v6 API for ipv4.
227	 */
228	inet->uc_ttl	= -1;
229
230	inet->mc_loop	= 1;
231	inet->mc_ttl	= 1;
232	inet->mc_index	= 0;
233	inet->mc_list	= NULL;
234	inet->rcv_tos	= 0;
235
236	if (ipv4_config.no_pmtu_disc)
237		inet->pmtudisc = IP_PMTUDISC_DONT;
238	else
239		inet->pmtudisc = IP_PMTUDISC_WANT;
240	/*
241	 * Increment only the relevant sk_prot->socks debug field, this changes
242	 * the previous behaviour of incrementing both the equivalent to
243	 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
244	 *
245	 * This allows better debug granularity as we'll know exactly how many
246	 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
247	 * transport protocol socks. -acme
248	 */
249	sk_refcnt_debug_inc(sk);
250
251	if (inet->inet_num) {
252		/* It assumes that any protocol which allows
253		 * the user to assign a number at socket
254		 * creation time automatically shares.
255		 */
256		inet->inet_sport = htons(inet->inet_num);
257		sk->sk_prot->hash(sk);
258	}
259	if (sk->sk_prot->init) {
260		err = sk->sk_prot->init(sk);
261		if (err) {
262			sk_common_release(sk);
263			goto out;
264		}
265	}
266out:
267	return err;
268out_rcu_unlock:
269	rcu_read_unlock();
270	goto out;
271}
272
273
274/* bind for INET6 API */
275int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
276{
277	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
278	struct sock *sk = sock->sk;
279	struct inet_sock *inet = inet_sk(sk);
280	struct ipv6_pinfo *np = inet6_sk(sk);
281	struct net *net = sock_net(sk);
282	__be32 v4addr = 0;
283	unsigned short snum;
284	int addr_type = 0;
285	int err = 0;
286
287	/* If the socket has its own bind function then use it. */
288	if (sk->sk_prot->bind)
289		return sk->sk_prot->bind(sk, uaddr, addr_len);
290
291	if (addr_len < SIN6_LEN_RFC2133)
292		return -EINVAL;
293
294	if (addr->sin6_family != AF_INET6)
295		return -EAFNOSUPPORT;
296
297	addr_type = ipv6_addr_type(&addr->sin6_addr);
298	if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
299		return -EINVAL;
300
301	snum = ntohs(addr->sin6_port);
302	if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
303		return -EACCES;
304
305	lock_sock(sk);
306
307	/* Check these errors (active socket, double bind). */
308	if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
309		err = -EINVAL;
310		goto out;
311	}
312
313	/* Check if the address belongs to the host. */
314	if (addr_type == IPV6_ADDR_MAPPED) {
315		int chk_addr_ret;
316
317		/* Binding to v4-mapped address on a v6-only socket
318		 * makes no sense
319		 */
320		if (np->ipv6only) {
321			err = -EINVAL;
322			goto out;
323		}
324
325		/* Reproduce AF_INET checks to make the bindings consistent */
326		v4addr = addr->sin6_addr.s6_addr32[3];
327		chk_addr_ret = inet_addr_type(net, v4addr);
328		if (!sysctl_ip_nonlocal_bind &&
329		    !(inet->freebind || inet->transparent) &&
330		    v4addr != htonl(INADDR_ANY) &&
331		    chk_addr_ret != RTN_LOCAL &&
332		    chk_addr_ret != RTN_MULTICAST &&
333		    chk_addr_ret != RTN_BROADCAST) {
334			err = -EADDRNOTAVAIL;
335			goto out;
336		}
337	} else {
338		if (addr_type != IPV6_ADDR_ANY) {
339			struct net_device *dev = NULL;
340
341			rcu_read_lock();
342			if (__ipv6_addr_needs_scope_id(addr_type)) {
343				if (addr_len >= sizeof(struct sockaddr_in6) &&
344				    addr->sin6_scope_id) {
345					/* Override any existing binding, if another one
346					 * is supplied by user.
347					 */
348					sk->sk_bound_dev_if = addr->sin6_scope_id;
349				}
350
351				/* Binding to link-local address requires an interface */
352				if (!sk->sk_bound_dev_if) {
353					err = -EINVAL;
354					goto out_unlock;
355				}
356				dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
357				if (!dev) {
358					err = -ENODEV;
359					goto out_unlock;
360				}
361			}
362
363			/* ipv4 addr of the socket is invalid.  Only the
364			 * unspecified and mapped address have a v4 equivalent.
365			 */
366			v4addr = LOOPBACK4_IPV6;
367			if (!(addr_type & IPV6_ADDR_MULTICAST))	{
368				if (!(inet->freebind || inet->transparent) &&
369				    !ipv6_chk_addr(net, &addr->sin6_addr,
370						   dev, 0)) {
371					err = -EADDRNOTAVAIL;
372					goto out_unlock;
373				}
374			}
375			rcu_read_unlock();
376		}
377	}
378
379	inet->inet_rcv_saddr = v4addr;
380	inet->inet_saddr = v4addr;
381
382	np->rcv_saddr = addr->sin6_addr;
383
384	if (!(addr_type & IPV6_ADDR_MULTICAST))
385		np->saddr = addr->sin6_addr;
386
387	/* Make sure we are allowed to bind here. */
388	if (sk->sk_prot->get_port(sk, snum)) {
389		inet_reset_saddr(sk);
390		err = -EADDRINUSE;
391		goto out;
392	}
393
394	if (addr_type != IPV6_ADDR_ANY) {
395		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
396		if (addr_type != IPV6_ADDR_MAPPED)
397			np->ipv6only = 1;
398	}
399	if (snum)
400		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
401	inet->inet_sport = htons(inet->inet_num);
402	inet->inet_dport = 0;
403	inet->inet_daddr = 0;
404out:
405	release_sock(sk);
406	return err;
407out_unlock:
408	rcu_read_unlock();
409	goto out;
410}
411EXPORT_SYMBOL(inet6_bind);
412
413int inet6_release(struct socket *sock)
414{
415	struct sock *sk = sock->sk;
416
417	if (sk == NULL)
418		return -EINVAL;
419
420	/* Free mc lists */
421	ipv6_sock_mc_close(sk);
422
423	/* Free ac lists */
424	ipv6_sock_ac_close(sk);
425
426	return inet_release(sock);
427}
428EXPORT_SYMBOL(inet6_release);
429
430void inet6_destroy_sock(struct sock *sk)
431{
432	struct ipv6_pinfo *np = inet6_sk(sk);
433	struct sk_buff *skb;
434	struct ipv6_txoptions *opt;
435
436	/* Release rx options */
437
438	skb = xchg(&np->pktoptions, NULL);
439	if (skb != NULL)
440		kfree_skb(skb);
441
442	skb = xchg(&np->rxpmtu, NULL);
443	if (skb != NULL)
444		kfree_skb(skb);
445
446	/* Free flowlabels */
447	fl6_free_socklist(sk);
448
449	/* Free tx options */
450
451	opt = xchg(&np->opt, NULL);
452	if (opt != NULL)
453		sock_kfree_s(sk, opt, opt->tot_len);
454}
455EXPORT_SYMBOL_GPL(inet6_destroy_sock);
456
457/*
458 *	This does both peername and sockname.
459 */
460
461int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
462		 int *uaddr_len, int peer)
463{
464	struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
465	struct sock *sk = sock->sk;
466	struct inet_sock *inet = inet_sk(sk);
467	struct ipv6_pinfo *np = inet6_sk(sk);
468
469	sin->sin6_family = AF_INET6;
470	sin->sin6_flowinfo = 0;
471	sin->sin6_scope_id = 0;
472	if (peer) {
473		if (!inet->inet_dport)
474			return -ENOTCONN;
475		if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
476		    peer == 1)
477			return -ENOTCONN;
478		sin->sin6_port = inet->inet_dport;
479		sin->sin6_addr = np->daddr;
480		if (np->sndflow)
481			sin->sin6_flowinfo = np->flow_label;
482	} else {
483		if (ipv6_addr_any(&np->rcv_saddr))
484			sin->sin6_addr = np->saddr;
485		else
486			sin->sin6_addr = np->rcv_saddr;
487
488		sin->sin6_port = inet->inet_sport;
489	}
490	sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
491						 sk->sk_bound_dev_if);
492	*uaddr_len = sizeof(*sin);
493	return 0;
494}
495EXPORT_SYMBOL(inet6_getname);
496
497int inet6_killaddr_ioctl(struct net *net, void __user *arg) {
498	struct in6_ifreq ireq;
499	struct sockaddr_in6 sin6;
500
501	if (!capable(CAP_NET_ADMIN))
502		return -EACCES;
503
504	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
505		return -EFAULT;
506
507	sin6.sin6_family = AF_INET6;
508	sin6.sin6_addr = ireq.ifr6_addr;
509	return tcp_nuke_addr(net, (struct sockaddr *) &sin6);
510}
511
512int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
513{
514	struct sock *sk = sock->sk;
515	struct net *net = sock_net(sk);
516
517	switch (cmd) {
518	case SIOCGSTAMP:
519		return sock_get_timestamp(sk, (struct timeval __user *)arg);
520
521	case SIOCGSTAMPNS:
522		return sock_get_timestampns(sk, (struct timespec __user *)arg);
523
524	case SIOCADDRT:
525	case SIOCDELRT:
526
527		return ipv6_route_ioctl(net, cmd, (void __user *)arg);
528
529	case SIOCSIFADDR:
530		return addrconf_add_ifaddr(net, (void __user *) arg);
531	case SIOCDIFADDR:
532		return addrconf_del_ifaddr(net, (void __user *) arg);
533	case SIOCSIFDSTADDR:
534		return addrconf_set_dstaddr(net, (void __user *) arg);
535	case SIOCKILLADDR:
536		return inet6_killaddr_ioctl(net, (void __user *) arg);
537	default:
538		if (!sk->sk_prot->ioctl)
539			return -ENOIOCTLCMD;
540		return sk->sk_prot->ioctl(sk, cmd, arg);
541	}
542	/*NOTREACHED*/
543	return 0;
544}
545EXPORT_SYMBOL(inet6_ioctl);
546
547const struct proto_ops inet6_stream_ops = {
548	.family		   = PF_INET6,
549	.owner		   = THIS_MODULE,
550	.release	   = inet6_release,
551	.bind		   = inet6_bind,
552	.connect	   = inet_stream_connect,	/* ok		*/
553	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
554	.accept		   = inet_accept,		/* ok		*/
555	.getname	   = inet6_getname,
556	.poll		   = tcp_poll,			/* ok		*/
557	.ioctl		   = inet6_ioctl,		/* must change  */
558	.listen		   = inet_listen,		/* ok		*/
559	.shutdown	   = inet_shutdown,		/* ok		*/
560	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
561	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
562	.sendmsg	   = inet_sendmsg,		/* ok		*/
563	.recvmsg	   = inet_recvmsg,		/* ok		*/
564	.mmap		   = sock_no_mmap,
565	.sendpage	   = inet_sendpage,
566	.splice_read	   = tcp_splice_read,
567#ifdef CONFIG_COMPAT
568	.compat_setsockopt = compat_sock_common_setsockopt,
569	.compat_getsockopt = compat_sock_common_getsockopt,
570#endif
571};
572
573const struct proto_ops inet6_dgram_ops = {
574	.family		   = PF_INET6,
575	.owner		   = THIS_MODULE,
576	.release	   = inet6_release,
577	.bind		   = inet6_bind,
578	.connect	   = inet_dgram_connect,	/* ok		*/
579	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
580	.accept		   = sock_no_accept,		/* a do nothing	*/
581	.getname	   = inet6_getname,
582	.poll		   = udp_poll,			/* ok		*/
583	.ioctl		   = inet6_ioctl,		/* must change  */
584	.listen		   = sock_no_listen,		/* ok		*/
585	.shutdown	   = inet_shutdown,		/* ok		*/
586	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
587	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
588	.sendmsg	   = inet_sendmsg,		/* ok		*/
589	.recvmsg	   = inet_recvmsg,		/* ok		*/
590	.mmap		   = sock_no_mmap,
591	.sendpage	   = sock_no_sendpage,
592#ifdef CONFIG_COMPAT
593	.compat_setsockopt = compat_sock_common_setsockopt,
594	.compat_getsockopt = compat_sock_common_getsockopt,
595#endif
596};
597
598static const struct net_proto_family inet6_family_ops = {
599	.family = PF_INET6,
600	.create = inet6_create,
601	.owner	= THIS_MODULE,
602};
603
604int inet6_register_protosw(struct inet_protosw *p)
605{
606	struct list_head *lh;
607	struct inet_protosw *answer;
608	struct list_head *last_perm;
609	int protocol = p->protocol;
610	int ret;
611
612	spin_lock_bh(&inetsw6_lock);
613
614	ret = -EINVAL;
615	if (p->type >= SOCK_MAX)
616		goto out_illegal;
617
618	/* If we are trying to override a permanent protocol, bail. */
619	answer = NULL;
620	ret = -EPERM;
621	last_perm = &inetsw6[p->type];
622	list_for_each(lh, &inetsw6[p->type]) {
623		answer = list_entry(lh, struct inet_protosw, list);
624
625		/* Check only the non-wild match. */
626		if (INET_PROTOSW_PERMANENT & answer->flags) {
627			if (protocol == answer->protocol)
628				break;
629			last_perm = lh;
630		}
631
632		answer = NULL;
633	}
634	if (answer)
635		goto out_permanent;
636
637	/* Add the new entry after the last permanent entry if any, so that
638	 * the new entry does not override a permanent entry when matched with
639	 * a wild-card protocol. But it is allowed to override any existing
640	 * non-permanent entry.  This means that when we remove this entry, the
641	 * system automatically returns to the old behavior.
642	 */
643	list_add_rcu(&p->list, last_perm);
644	ret = 0;
645out:
646	spin_unlock_bh(&inetsw6_lock);
647	return ret;
648
649out_permanent:
650	pr_err("Attempt to override permanent protocol %d\n", protocol);
651	goto out;
652
653out_illegal:
654	pr_err("Ignoring attempt to register invalid socket type %d\n",
655	       p->type);
656	goto out;
657}
658EXPORT_SYMBOL(inet6_register_protosw);
659
660void
661inet6_unregister_protosw(struct inet_protosw *p)
662{
663	if (INET_PROTOSW_PERMANENT & p->flags) {
664		pr_err("Attempt to unregister permanent protocol %d\n",
665		       p->protocol);
666	} else {
667		spin_lock_bh(&inetsw6_lock);
668		list_del_rcu(&p->list);
669		spin_unlock_bh(&inetsw6_lock);
670
671		synchronize_net();
672	}
673}
674EXPORT_SYMBOL(inet6_unregister_protosw);
675
676int inet6_sk_rebuild_header(struct sock *sk)
677{
678	struct ipv6_pinfo *np = inet6_sk(sk);
679	struct dst_entry *dst;
680
681	dst = __sk_dst_check(sk, np->dst_cookie);
682
683	if (dst == NULL) {
684		struct inet_sock *inet = inet_sk(sk);
685		struct in6_addr *final_p, final;
686		struct flowi6 fl6;
687
688		memset(&fl6, 0, sizeof(fl6));
689		fl6.flowi6_proto = sk->sk_protocol;
690		fl6.daddr = np->daddr;
691		fl6.saddr = np->saddr;
692		fl6.flowlabel = np->flow_label;
693		fl6.flowi6_oif = sk->sk_bound_dev_if;
694		fl6.flowi6_mark = sk->sk_mark;
695		fl6.fl6_dport = inet->inet_dport;
696		fl6.fl6_sport = inet->inet_sport;
697		fl6.flowi6_uid = sock_i_uid(sk);
698		security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
699
700		final_p = fl6_update_dst(&fl6, np->opt, &final);
701
702		dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
703		if (IS_ERR(dst)) {
704			sk->sk_route_caps = 0;
705			sk->sk_err_soft = -PTR_ERR(dst);
706			return PTR_ERR(dst);
707		}
708
709		__ip6_dst_store(sk, dst, NULL, NULL);
710	}
711
712	return 0;
713}
714EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
715
716bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb)
717{
718	const struct ipv6_pinfo *np = inet6_sk(sk);
719	const struct inet6_skb_parm *opt = IP6CB(skb);
720
721	if (np->rxopt.all) {
722		if ((opt->hop && (np->rxopt.bits.hopopts ||
723				  np->rxopt.bits.ohopopts)) ||
724		    ((IPV6_FLOWINFO_MASK &
725		      *(__be32 *)skb_network_header(skb)) &&
726		     np->rxopt.bits.rxflow) ||
727		    (opt->srcrt && (np->rxopt.bits.srcrt ||
728		     np->rxopt.bits.osrcrt)) ||
729		    ((opt->dst1 || opt->dst0) &&
730		     (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
731			return true;
732	}
733	return false;
734}
735EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
736
737static struct packet_type ipv6_packet_type __read_mostly = {
738	.type = cpu_to_be16(ETH_P_IPV6),
739	.func = ipv6_rcv,
740};
741
742static int __init ipv6_packet_init(void)
743{
744	dev_add_pack(&ipv6_packet_type);
745	return 0;
746}
747
748static void ipv6_packet_cleanup(void)
749{
750	dev_remove_pack(&ipv6_packet_type);
751}
752
753static int __net_init ipv6_init_mibs(struct net *net)
754{
755	if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
756			  sizeof(struct udp_mib),
757			  __alignof__(struct udp_mib)) < 0)
758		return -ENOMEM;
759	if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
760			  sizeof(struct udp_mib),
761			  __alignof__(struct udp_mib)) < 0)
762		goto err_udplite_mib;
763	if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
764			  sizeof(struct ipstats_mib),
765			  __alignof__(struct ipstats_mib)) < 0)
766		goto err_ip_mib;
767	if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
768			  sizeof(struct icmpv6_mib),
769			  __alignof__(struct icmpv6_mib)) < 0)
770		goto err_icmp_mib;
771	net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
772						GFP_KERNEL);
773	if (!net->mib.icmpv6msg_statistics)
774		goto err_icmpmsg_mib;
775	return 0;
776
777err_icmpmsg_mib:
778	snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
779err_icmp_mib:
780	snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
781err_ip_mib:
782	snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
783err_udplite_mib:
784	snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
785	return -ENOMEM;
786}
787
788static void ipv6_cleanup_mibs(struct net *net)
789{
790	snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
791	snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
792	snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
793	snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
794	kfree(net->mib.icmpv6msg_statistics);
795}
796
797static int __net_init inet6_net_init(struct net *net)
798{
799	int err = 0;
800
801	net->ipv6.sysctl.bindv6only = 0;
802	net->ipv6.sysctl.icmpv6_time = 1*HZ;
803
804	err = ipv6_init_mibs(net);
805	if (err)
806		return err;
807#ifdef CONFIG_PROC_FS
808	err = udp6_proc_init(net);
809	if (err)
810		goto out;
811	err = tcp6_proc_init(net);
812	if (err)
813		goto proc_tcp6_fail;
814	err = ac6_proc_init(net);
815	if (err)
816		goto proc_ac6_fail;
817#endif
818	return err;
819
820#ifdef CONFIG_PROC_FS
821proc_ac6_fail:
822	tcp6_proc_exit(net);
823proc_tcp6_fail:
824	udp6_proc_exit(net);
825out:
826	ipv6_cleanup_mibs(net);
827	return err;
828#endif
829}
830
831static void __net_exit inet6_net_exit(struct net *net)
832{
833#ifdef CONFIG_PROC_FS
834	udp6_proc_exit(net);
835	tcp6_proc_exit(net);
836	ac6_proc_exit(net);
837#endif
838	ipv6_cleanup_mibs(net);
839}
840
841static struct pernet_operations inet6_net_ops = {
842	.init = inet6_net_init,
843	.exit = inet6_net_exit,
844};
845
846static int __init inet6_init(void)
847{
848	struct list_head *r;
849	int err = 0;
850
851	BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
852
853	/* Register the socket-side information for inet6_create.  */
854	for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
855		INIT_LIST_HEAD(r);
856
857	if (disable_ipv6_mod) {
858		pr_info("Loaded, but administratively disabled, reboot required to enable\n");
859		goto out;
860	}
861
862	err = proto_register(&tcpv6_prot, 1);
863	if (err)
864		goto out;
865
866	err = proto_register(&udpv6_prot, 1);
867	if (err)
868		goto out_unregister_tcp_proto;
869
870	err = proto_register(&udplitev6_prot, 1);
871	if (err)
872		goto out_unregister_udp_proto;
873
874	err = proto_register(&rawv6_prot, 1);
875	if (err)
876		goto out_unregister_udplite_proto;
877
878	err = proto_register(&pingv6_prot, 1);
879	if (err)
880		goto out_unregister_ping_proto;
881
882	/* We MUST register RAW sockets before we create the ICMP6,
883	 * IGMP6, or NDISC control sockets.
884	 */
885	err = rawv6_init();
886	if (err)
887		goto out_unregister_raw_proto;
888
889	/* Register the family here so that the init calls below will
890	 * be able to create sockets. (?? is this dangerous ??)
891	 */
892	err = sock_register(&inet6_family_ops);
893	if (err)
894		goto out_sock_register_fail;
895
896	tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
897
898	/*
899	 *	ipngwg API draft makes clear that the correct semantics
900	 *	for TCP and UDP is to consider one TCP and UDP instance
901	 *	in a host available by both INET and INET6 APIs and
902	 *	able to communicate via both network protocols.
903	 */
904
905	err = register_pernet_subsys(&inet6_net_ops);
906	if (err)
907		goto register_pernet_fail;
908	err = icmpv6_init();
909	if (err)
910		goto icmp_fail;
911	err = ip6_mr_init();
912	if (err)
913		goto ipmr_fail;
914	err = ndisc_init();
915	if (err)
916		goto ndisc_fail;
917	err = igmp6_init();
918	if (err)
919		goto igmp_fail;
920	err = ipv6_netfilter_init();
921	if (err)
922		goto netfilter_fail;
923	/* Create /proc/foo6 entries. */
924#ifdef CONFIG_PROC_FS
925	err = -ENOMEM;
926	if (raw6_proc_init())
927		goto proc_raw6_fail;
928	if (udplite6_proc_init())
929		goto proc_udplite6_fail;
930	if (ipv6_misc_proc_init())
931		goto proc_misc6_fail;
932	if (if6_proc_init())
933		goto proc_if6_fail;
934#endif
935	err = ip6_route_init();
936	if (err)
937		goto ip6_route_fail;
938	err = ip6_flowlabel_init();
939	if (err)
940		goto ip6_flowlabel_fail;
941	err = addrconf_init();
942	if (err)
943		goto addrconf_fail;
944
945	/* Init v6 extension headers. */
946	err = ipv6_exthdrs_init();
947	if (err)
948		goto ipv6_exthdrs_fail;
949
950	err = ipv6_frag_init();
951	if (err)
952		goto ipv6_frag_fail;
953
954	/* Init v6 transport protocols. */
955	err = udpv6_init();
956	if (err)
957		goto udpv6_fail;
958
959	err = udplitev6_init();
960	if (err)
961		goto udplitev6_fail;
962
963	err = tcpv6_init();
964	if (err)
965		goto tcpv6_fail;
966
967	err = ipv6_packet_init();
968	if (err)
969		goto ipv6_packet_fail;
970
971	err = pingv6_init();
972	if (err)
973		goto pingv6_fail;
974
975#ifdef CONFIG_SYSCTL
976	err = ipv6_sysctl_register();
977	if (err)
978		goto sysctl_fail;
979#endif
980out:
981	return err;
982
983#ifdef CONFIG_SYSCTL
984sysctl_fail:
985	ipv6_packet_cleanup();
986#endif
987pingv6_fail:
988	pingv6_exit();
989ipv6_packet_fail:
990	tcpv6_exit();
991tcpv6_fail:
992	udplitev6_exit();
993udplitev6_fail:
994	udpv6_exit();
995udpv6_fail:
996	ipv6_frag_exit();
997ipv6_frag_fail:
998	ipv6_exthdrs_exit();
999ipv6_exthdrs_fail:
1000	addrconf_cleanup();
1001addrconf_fail:
1002	ip6_flowlabel_cleanup();
1003ip6_flowlabel_fail:
1004	ip6_route_cleanup();
1005ip6_route_fail:
1006#ifdef CONFIG_PROC_FS
1007	if6_proc_exit();
1008proc_if6_fail:
1009	ipv6_misc_proc_exit();
1010proc_misc6_fail:
1011	udplite6_proc_exit();
1012proc_udplite6_fail:
1013	raw6_proc_exit();
1014proc_raw6_fail:
1015#endif
1016	ipv6_netfilter_fini();
1017netfilter_fail:
1018	igmp6_cleanup();
1019igmp_fail:
1020	ndisc_cleanup();
1021ndisc_fail:
1022	ip6_mr_cleanup();
1023ipmr_fail:
1024	icmpv6_cleanup();
1025icmp_fail:
1026	unregister_pernet_subsys(&inet6_net_ops);
1027register_pernet_fail:
1028	sock_unregister(PF_INET6);
1029	rtnl_unregister_all(PF_INET6);
1030out_sock_register_fail:
1031	rawv6_exit();
1032out_unregister_ping_proto:
1033	proto_unregister(&pingv6_prot);
1034out_unregister_raw_proto:
1035	proto_unregister(&rawv6_prot);
1036out_unregister_udplite_proto:
1037	proto_unregister(&udplitev6_prot);
1038out_unregister_udp_proto:
1039	proto_unregister(&udpv6_prot);
1040out_unregister_tcp_proto:
1041	proto_unregister(&tcpv6_prot);
1042	goto out;
1043}
1044module_init(inet6_init);
1045
1046static void __exit inet6_exit(void)
1047{
1048	if (disable_ipv6_mod)
1049		return;
1050
1051	/* First of all disallow new sockets creation. */
1052	sock_unregister(PF_INET6);
1053	/* Disallow any further netlink messages */
1054	rtnl_unregister_all(PF_INET6);
1055
1056	udpv6_exit();
1057	udplitev6_exit();
1058	tcpv6_exit();
1059
1060	/* Cleanup code parts. */
1061	ipv6_packet_cleanup();
1062	ipv6_frag_exit();
1063	ipv6_exthdrs_exit();
1064	addrconf_cleanup();
1065	ip6_flowlabel_cleanup();
1066	ip6_route_cleanup();
1067#ifdef CONFIG_PROC_FS
1068
1069	/* Cleanup code parts. */
1070	if6_proc_exit();
1071	ipv6_misc_proc_exit();
1072	udplite6_proc_exit();
1073	raw6_proc_exit();
1074#endif
1075	ipv6_netfilter_fini();
1076	igmp6_cleanup();
1077	ndisc_cleanup();
1078	ip6_mr_cleanup();
1079	icmpv6_cleanup();
1080	rawv6_exit();
1081
1082	unregister_pernet_subsys(&inet6_net_ops);
1083	proto_unregister(&rawv6_prot);
1084	proto_unregister(&udplitev6_prot);
1085	proto_unregister(&udpv6_prot);
1086	proto_unregister(&tcpv6_prot);
1087
1088	rcu_barrier(); /* Wait for completion of call_rcu()'s */
1089}
1090module_exit(inet6_exit);
1091
1092MODULE_ALIAS_NETPROTO(PF_INET6);
1093