xref: /openbmc/linux/net/ipv6/af_inet6.c (revision 643d1f7f)
1 /*
2  *	PF_INET6 socket protocol family
3  *	Linux INET6 implementation
4  *
5  *	Authors:
6  *	Pedro Roque		<roque@di.fc.ul.pt>
7  *
8  *	Adapted from linux/net/ipv4/af_inet.c
9  *
10  *	$Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
11  *
12  * 	Fixes:
13  *	piggy, Karl Knutson	:	Socket protocol table
14  * 	Hideaki YOSHIFUJI	:	sin6_scope_id support
15  * 	Arnaldo Melo		: 	check proc_net_create return, cleanups
16  *
17  *	This program is free software; you can redistribute it and/or
18  *      modify it under the terms of the GNU General Public License
19  *      as published by the Free Software Foundation; either version
20  *      2 of the License, or (at your option) any later version.
21  */
22 
23 
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/in.h>
30 #include <linux/kernel.h>
31 #include <linux/timer.h>
32 #include <linux/string.h>
33 #include <linux/sockios.h>
34 #include <linux/net.h>
35 #include <linux/fcntl.h>
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <linux/proc_fs.h>
39 #include <linux/stat.h>
40 #include <linux/init.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/ipip.h>
53 #include <net/protocol.h>
54 #include <net/inet_common.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 
65 MODULE_AUTHOR("Cast of dozens");
66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67 MODULE_LICENSE("GPL");
68 
69 /* The inetsw6 table contains everything that inet6_create needs to
70  * build a new socket.
71  */
72 static struct list_head inetsw6[SOCK_MAX];
73 static DEFINE_SPINLOCK(inetsw6_lock);
74 
75 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
76 {
77 	const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
78 
79 	return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
80 }
81 
82 static int inet6_create(struct net *net, struct socket *sock, int protocol)
83 {
84 	struct inet_sock *inet;
85 	struct ipv6_pinfo *np;
86 	struct sock *sk;
87 	struct list_head *p;
88 	struct inet_protosw *answer;
89 	struct proto *answer_prot;
90 	unsigned char answer_flags;
91 	char answer_no_check;
92 	int try_loading_module = 0;
93 	int err;
94 
95 	if (net != &init_net)
96 		return -EAFNOSUPPORT;
97 
98 	if (sock->type != SOCK_RAW &&
99 	    sock->type != SOCK_DGRAM &&
100 	    !inet_ehash_secret)
101 		build_ehash_secret();
102 
103 	/* Look for the requested type/protocol pair. */
104 	answer = NULL;
105 lookup_protocol:
106 	err = -ESOCKTNOSUPPORT;
107 	rcu_read_lock();
108 	list_for_each_rcu(p, &inetsw6[sock->type]) {
109 		answer = list_entry(p, struct inet_protosw, list);
110 
111 		/* Check the non-wild match. */
112 		if (protocol == answer->protocol) {
113 			if (protocol != IPPROTO_IP)
114 				break;
115 		} else {
116 			/* Check for the two wild cases. */
117 			if (IPPROTO_IP == protocol) {
118 				protocol = answer->protocol;
119 				break;
120 			}
121 			if (IPPROTO_IP == answer->protocol)
122 				break;
123 		}
124 		err = -EPROTONOSUPPORT;
125 		answer = NULL;
126 	}
127 
128 	if (!answer) {
129 		if (try_loading_module < 2) {
130 			rcu_read_unlock();
131 			/*
132 			 * Be more specific, e.g. net-pf-10-proto-132-type-1
133 			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
134 			 */
135 			if (++try_loading_module == 1)
136 				request_module("net-pf-%d-proto-%d-type-%d",
137 						PF_INET6, protocol, sock->type);
138 			/*
139 			 * Fall back to generic, e.g. net-pf-10-proto-132
140 			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
141 			 */
142 			else
143 				request_module("net-pf-%d-proto-%d",
144 						PF_INET6, protocol);
145 			goto lookup_protocol;
146 		} else
147 			goto out_rcu_unlock;
148 	}
149 
150 	err = -EPERM;
151 	if (answer->capability > 0 && !capable(answer->capability))
152 		goto out_rcu_unlock;
153 
154 	sock->ops = answer->ops;
155 	answer_prot = answer->prot;
156 	answer_no_check = answer->no_check;
157 	answer_flags = answer->flags;
158 	rcu_read_unlock();
159 
160 	BUG_TRAP(answer_prot->slab != NULL);
161 
162 	err = -ENOBUFS;
163 	sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
164 	if (sk == NULL)
165 		goto out;
166 
167 	sock_init_data(sock, sk);
168 
169 	err = 0;
170 	sk->sk_no_check = answer_no_check;
171 	if (INET_PROTOSW_REUSE & answer_flags)
172 		sk->sk_reuse = 1;
173 
174 	inet = inet_sk(sk);
175 	inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
176 
177 	if (SOCK_RAW == sock->type) {
178 		inet->num = protocol;
179 		if (IPPROTO_RAW == protocol)
180 			inet->hdrincl = 1;
181 	}
182 
183 	sk->sk_destruct		= inet_sock_destruct;
184 	sk->sk_family		= PF_INET6;
185 	sk->sk_protocol		= protocol;
186 
187 	sk->sk_backlog_rcv	= answer->prot->backlog_rcv;
188 
189 	inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
190 	np->hop_limit	= -1;
191 	np->mcast_hops	= -1;
192 	np->mc_loop	= 1;
193 	np->pmtudisc	= IPV6_PMTUDISC_WANT;
194 	np->ipv6only	= init_net.ipv6.sysctl.bindv6only;
195 
196 	/* Init the ipv4 part of the socket since we can have sockets
197 	 * using v6 API for ipv4.
198 	 */
199 	inet->uc_ttl	= -1;
200 
201 	inet->mc_loop	= 1;
202 	inet->mc_ttl	= 1;
203 	inet->mc_index	= 0;
204 	inet->mc_list	= NULL;
205 
206 	if (ipv4_config.no_pmtu_disc)
207 		inet->pmtudisc = IP_PMTUDISC_DONT;
208 	else
209 		inet->pmtudisc = IP_PMTUDISC_WANT;
210 	/*
211 	 * Increment only the relevant sk_prot->socks debug field, this changes
212 	 * the previous behaviour of incrementing both the equivalent to
213 	 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
214 	 *
215 	 * This allows better debug granularity as we'll know exactly how many
216 	 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
217 	 * transport protocol socks. -acme
218 	 */
219 	sk_refcnt_debug_inc(sk);
220 
221 	if (inet->num) {
222 		/* It assumes that any protocol which allows
223 		 * the user to assign a number at socket
224 		 * creation time automatically shares.
225 		 */
226 		inet->sport = htons(inet->num);
227 		sk->sk_prot->hash(sk);
228 	}
229 	if (sk->sk_prot->init) {
230 		err = sk->sk_prot->init(sk);
231 		if (err) {
232 			sk_common_release(sk);
233 			goto out;
234 		}
235 	}
236 out:
237 	return err;
238 out_rcu_unlock:
239 	rcu_read_unlock();
240 	goto out;
241 }
242 
243 
244 /* bind for INET6 API */
245 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
246 {
247 	struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
248 	struct sock *sk = sock->sk;
249 	struct inet_sock *inet = inet_sk(sk);
250 	struct ipv6_pinfo *np = inet6_sk(sk);
251 	__be32 v4addr = 0;
252 	unsigned short snum;
253 	int addr_type = 0;
254 	int err = 0;
255 
256 	/* If the socket has its own bind function then use it. */
257 	if (sk->sk_prot->bind)
258 		return sk->sk_prot->bind(sk, uaddr, addr_len);
259 
260 	if (addr_len < SIN6_LEN_RFC2133)
261 		return -EINVAL;
262 	addr_type = ipv6_addr_type(&addr->sin6_addr);
263 	if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
264 		return -EINVAL;
265 
266 	snum = ntohs(addr->sin6_port);
267 	if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
268 		return -EACCES;
269 
270 	lock_sock(sk);
271 
272 	/* Check these errors (active socket, double bind). */
273 	if (sk->sk_state != TCP_CLOSE || inet->num) {
274 		err = -EINVAL;
275 		goto out;
276 	}
277 
278 	/* Check if the address belongs to the host. */
279 	if (addr_type == IPV6_ADDR_MAPPED) {
280 		v4addr = addr->sin6_addr.s6_addr32[3];
281 		if (inet_addr_type(&init_net, v4addr) != RTN_LOCAL) {
282 			err = -EADDRNOTAVAIL;
283 			goto out;
284 		}
285 	} else {
286 		if (addr_type != IPV6_ADDR_ANY) {
287 			struct net_device *dev = NULL;
288 
289 			if (addr_type & IPV6_ADDR_LINKLOCAL) {
290 				if (addr_len >= sizeof(struct sockaddr_in6) &&
291 				    addr->sin6_scope_id) {
292 					/* Override any existing binding, if another one
293 					 * is supplied by user.
294 					 */
295 					sk->sk_bound_dev_if = addr->sin6_scope_id;
296 				}
297 
298 				/* Binding to link-local address requires an interface */
299 				if (!sk->sk_bound_dev_if) {
300 					err = -EINVAL;
301 					goto out;
302 				}
303 				dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
304 				if (!dev) {
305 					err = -ENODEV;
306 					goto out;
307 				}
308 			}
309 
310 			/* ipv4 addr of the socket is invalid.  Only the
311 			 * unspecified and mapped address have a v4 equivalent.
312 			 */
313 			v4addr = LOOPBACK4_IPV6;
314 			if (!(addr_type & IPV6_ADDR_MULTICAST))	{
315 				if (!ipv6_chk_addr(&init_net, &addr->sin6_addr,
316 						   dev, 0)) {
317 					if (dev)
318 						dev_put(dev);
319 					err = -EADDRNOTAVAIL;
320 					goto out;
321 				}
322 			}
323 			if (dev)
324 				dev_put(dev);
325 		}
326 	}
327 
328 	inet->rcv_saddr = v4addr;
329 	inet->saddr = v4addr;
330 
331 	ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
332 
333 	if (!(addr_type & IPV6_ADDR_MULTICAST))
334 		ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
335 
336 	/* Make sure we are allowed to bind here. */
337 	if (sk->sk_prot->get_port(sk, snum)) {
338 		inet_reset_saddr(sk);
339 		err = -EADDRINUSE;
340 		goto out;
341 	}
342 
343 	if (addr_type != IPV6_ADDR_ANY)
344 		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
345 	if (snum)
346 		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
347 	inet->sport = htons(inet->num);
348 	inet->dport = 0;
349 	inet->daddr = 0;
350 out:
351 	release_sock(sk);
352 	return err;
353 }
354 
355 EXPORT_SYMBOL(inet6_bind);
356 
357 int inet6_release(struct socket *sock)
358 {
359 	struct sock *sk = sock->sk;
360 
361 	if (sk == NULL)
362 		return -EINVAL;
363 
364 	/* Free mc lists */
365 	ipv6_sock_mc_close(sk);
366 
367 	/* Free ac lists */
368 	ipv6_sock_ac_close(sk);
369 
370 	return inet_release(sock);
371 }
372 
373 EXPORT_SYMBOL(inet6_release);
374 
375 int inet6_destroy_sock(struct sock *sk)
376 {
377 	struct ipv6_pinfo *np = inet6_sk(sk);
378 	struct sk_buff *skb;
379 	struct ipv6_txoptions *opt;
380 
381 	/* Release rx options */
382 
383 	if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
384 		kfree_skb(skb);
385 
386 	/* Free flowlabels */
387 	fl6_free_socklist(sk);
388 
389 	/* Free tx options */
390 
391 	if ((opt = xchg(&np->opt, NULL)) != NULL)
392 		sock_kfree_s(sk, opt, opt->tot_len);
393 
394 	return 0;
395 }
396 
397 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
398 
399 /*
400  *	This does both peername and sockname.
401  */
402 
403 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
404 		 int *uaddr_len, int peer)
405 {
406 	struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
407 	struct sock *sk = sock->sk;
408 	struct inet_sock *inet = inet_sk(sk);
409 	struct ipv6_pinfo *np = inet6_sk(sk);
410 
411 	sin->sin6_family = AF_INET6;
412 	sin->sin6_flowinfo = 0;
413 	sin->sin6_scope_id = 0;
414 	if (peer) {
415 		if (!inet->dport)
416 			return -ENOTCONN;
417 		if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
418 		    peer == 1)
419 			return -ENOTCONN;
420 		sin->sin6_port = inet->dport;
421 		ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
422 		if (np->sndflow)
423 			sin->sin6_flowinfo = np->flow_label;
424 	} else {
425 		if (ipv6_addr_any(&np->rcv_saddr))
426 			ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
427 		else
428 			ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
429 
430 		sin->sin6_port = inet->sport;
431 	}
432 	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
433 		sin->sin6_scope_id = sk->sk_bound_dev_if;
434 	*uaddr_len = sizeof(*sin);
435 	return(0);
436 }
437 
438 EXPORT_SYMBOL(inet6_getname);
439 
440 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
441 {
442 	struct sock *sk = sock->sk;
443 
444 	switch(cmd)
445 	{
446 	case SIOCGSTAMP:
447 		return sock_get_timestamp(sk, (struct timeval __user *)arg);
448 
449 	case SIOCGSTAMPNS:
450 		return sock_get_timestampns(sk, (struct timespec __user *)arg);
451 
452 	case SIOCADDRT:
453 	case SIOCDELRT:
454 
455 		return(ipv6_route_ioctl(cmd,(void __user *)arg));
456 
457 	case SIOCSIFADDR:
458 		return addrconf_add_ifaddr((void __user *) arg);
459 	case SIOCDIFADDR:
460 		return addrconf_del_ifaddr((void __user *) arg);
461 	case SIOCSIFDSTADDR:
462 		return addrconf_set_dstaddr((void __user *) arg);
463 	default:
464 		if (!sk->sk_prot->ioctl)
465 			return -ENOIOCTLCMD;
466 		return sk->sk_prot->ioctl(sk, cmd, arg);
467 	}
468 	/*NOTREACHED*/
469 	return(0);
470 }
471 
472 EXPORT_SYMBOL(inet6_ioctl);
473 
474 const struct proto_ops inet6_stream_ops = {
475 	.family		   = PF_INET6,
476 	.owner		   = THIS_MODULE,
477 	.release	   = inet6_release,
478 	.bind		   = inet6_bind,
479 	.connect	   = inet_stream_connect,	/* ok		*/
480 	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
481 	.accept		   = inet_accept,		/* ok		*/
482 	.getname	   = inet6_getname,
483 	.poll		   = tcp_poll,			/* ok		*/
484 	.ioctl		   = inet6_ioctl,		/* must change  */
485 	.listen		   = inet_listen,		/* ok		*/
486 	.shutdown	   = inet_shutdown,		/* ok		*/
487 	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
488 	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
489 	.sendmsg	   = tcp_sendmsg,		/* ok		*/
490 	.recvmsg	   = sock_common_recvmsg,	/* ok		*/
491 	.mmap		   = sock_no_mmap,
492 	.sendpage	   = tcp_sendpage,
493 	.splice_read	   = tcp_splice_read,
494 #ifdef CONFIG_COMPAT
495 	.compat_setsockopt = compat_sock_common_setsockopt,
496 	.compat_getsockopt = compat_sock_common_getsockopt,
497 #endif
498 };
499 
500 const struct proto_ops inet6_dgram_ops = {
501 	.family		   = PF_INET6,
502 	.owner		   = THIS_MODULE,
503 	.release	   = inet6_release,
504 	.bind		   = inet6_bind,
505 	.connect	   = inet_dgram_connect,	/* ok		*/
506 	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
507 	.accept		   = sock_no_accept,		/* a do nothing	*/
508 	.getname	   = inet6_getname,
509 	.poll		   = udp_poll,			/* ok		*/
510 	.ioctl		   = inet6_ioctl,		/* must change  */
511 	.listen		   = sock_no_listen,		/* ok		*/
512 	.shutdown	   = inet_shutdown,		/* ok		*/
513 	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
514 	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
515 	.sendmsg	   = inet_sendmsg,		/* ok		*/
516 	.recvmsg	   = sock_common_recvmsg,	/* ok		*/
517 	.mmap		   = sock_no_mmap,
518 	.sendpage	   = sock_no_sendpage,
519 #ifdef CONFIG_COMPAT
520 	.compat_setsockopt = compat_sock_common_setsockopt,
521 	.compat_getsockopt = compat_sock_common_getsockopt,
522 #endif
523 };
524 
525 static struct net_proto_family inet6_family_ops = {
526 	.family = PF_INET6,
527 	.create = inet6_create,
528 	.owner	= THIS_MODULE,
529 };
530 
531 int inet6_register_protosw(struct inet_protosw *p)
532 {
533 	struct list_head *lh;
534 	struct inet_protosw *answer;
535 	struct list_head *last_perm;
536 	int protocol = p->protocol;
537 	int ret;
538 
539 	spin_lock_bh(&inetsw6_lock);
540 
541 	ret = -EINVAL;
542 	if (p->type >= SOCK_MAX)
543 		goto out_illegal;
544 
545 	/* If we are trying to override a permanent protocol, bail. */
546 	answer = NULL;
547 	ret = -EPERM;
548 	last_perm = &inetsw6[p->type];
549 	list_for_each(lh, &inetsw6[p->type]) {
550 		answer = list_entry(lh, struct inet_protosw, list);
551 
552 		/* Check only the non-wild match. */
553 		if (INET_PROTOSW_PERMANENT & answer->flags) {
554 			if (protocol == answer->protocol)
555 				break;
556 			last_perm = lh;
557 		}
558 
559 		answer = NULL;
560 	}
561 	if (answer)
562 		goto out_permanent;
563 
564 	/* Add the new entry after the last permanent entry if any, so that
565 	 * the new entry does not override a permanent entry when matched with
566 	 * a wild-card protocol. But it is allowed to override any existing
567 	 * non-permanent entry.  This means that when we remove this entry, the
568 	 * system automatically returns to the old behavior.
569 	 */
570 	list_add_rcu(&p->list, last_perm);
571 	ret = 0;
572 out:
573 	spin_unlock_bh(&inetsw6_lock);
574 	return ret;
575 
576 out_permanent:
577 	printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
578 	       protocol);
579 	goto out;
580 
581 out_illegal:
582 	printk(KERN_ERR
583 	       "Ignoring attempt to register invalid socket type %d.\n",
584 	       p->type);
585 	goto out;
586 }
587 
588 EXPORT_SYMBOL(inet6_register_protosw);
589 
590 void
591 inet6_unregister_protosw(struct inet_protosw *p)
592 {
593 	if (INET_PROTOSW_PERMANENT & p->flags) {
594 		printk(KERN_ERR
595 		       "Attempt to unregister permanent protocol %d.\n",
596 		       p->protocol);
597 	} else {
598 		spin_lock_bh(&inetsw6_lock);
599 		list_del_rcu(&p->list);
600 		spin_unlock_bh(&inetsw6_lock);
601 
602 		synchronize_net();
603 	}
604 }
605 
606 EXPORT_SYMBOL(inet6_unregister_protosw);
607 
608 int inet6_sk_rebuild_header(struct sock *sk)
609 {
610 	int err;
611 	struct dst_entry *dst;
612 	struct ipv6_pinfo *np = inet6_sk(sk);
613 
614 	dst = __sk_dst_check(sk, np->dst_cookie);
615 
616 	if (dst == NULL) {
617 		struct inet_sock *inet = inet_sk(sk);
618 		struct in6_addr *final_p = NULL, final;
619 		struct flowi fl;
620 
621 		memset(&fl, 0, sizeof(fl));
622 		fl.proto = sk->sk_protocol;
623 		ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
624 		ipv6_addr_copy(&fl.fl6_src, &np->saddr);
625 		fl.fl6_flowlabel = np->flow_label;
626 		fl.oif = sk->sk_bound_dev_if;
627 		fl.fl_ip_dport = inet->dport;
628 		fl.fl_ip_sport = inet->sport;
629 		security_sk_classify_flow(sk, &fl);
630 
631 		if (np->opt && np->opt->srcrt) {
632 			struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
633 			ipv6_addr_copy(&final, &fl.fl6_dst);
634 			ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
635 			final_p = &final;
636 		}
637 
638 		err = ip6_dst_lookup(sk, &dst, &fl);
639 		if (err) {
640 			sk->sk_route_caps = 0;
641 			return err;
642 		}
643 		if (final_p)
644 			ipv6_addr_copy(&fl.fl6_dst, final_p);
645 
646 		if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
647 			sk->sk_err_soft = -err;
648 			return err;
649 		}
650 
651 		__ip6_dst_store(sk, dst, NULL, NULL);
652 	}
653 
654 	return 0;
655 }
656 
657 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
658 
659 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
660 {
661 	struct ipv6_pinfo *np = inet6_sk(sk);
662 	struct inet6_skb_parm *opt = IP6CB(skb);
663 
664 	if (np->rxopt.all) {
665 		if ((opt->hop && (np->rxopt.bits.hopopts ||
666 				  np->rxopt.bits.ohopopts)) ||
667 		    ((IPV6_FLOWINFO_MASK &
668 		      *(__be32 *)skb_network_header(skb)) &&
669 		     np->rxopt.bits.rxflow) ||
670 		    (opt->srcrt && (np->rxopt.bits.srcrt ||
671 		     np->rxopt.bits.osrcrt)) ||
672 		    ((opt->dst1 || opt->dst0) &&
673 		     (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
674 			return 1;
675 	}
676 	return 0;
677 }
678 
679 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
680 
681 static int __init init_ipv6_mibs(void)
682 {
683 	if (snmp_mib_init((void **)ipv6_statistics,
684 			  sizeof(struct ipstats_mib)) < 0)
685 		goto err_ip_mib;
686 	if (snmp_mib_init((void **)icmpv6_statistics,
687 			  sizeof(struct icmpv6_mib)) < 0)
688 		goto err_icmp_mib;
689 	if (snmp_mib_init((void **)icmpv6msg_statistics,
690 			  sizeof(struct icmpv6msg_mib)) < 0)
691 		goto err_icmpmsg_mib;
692 	if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
693 		goto err_udp_mib;
694 	if (snmp_mib_init((void **)udplite_stats_in6,
695 			  sizeof (struct udp_mib)) < 0)
696 		goto err_udplite_mib;
697 	return 0;
698 
699 err_udplite_mib:
700 	snmp_mib_free((void **)udp_stats_in6);
701 err_udp_mib:
702 	snmp_mib_free((void **)icmpv6msg_statistics);
703 err_icmpmsg_mib:
704 	snmp_mib_free((void **)icmpv6_statistics);
705 err_icmp_mib:
706 	snmp_mib_free((void **)ipv6_statistics);
707 err_ip_mib:
708 	return -ENOMEM;
709 
710 }
711 
712 static void cleanup_ipv6_mibs(void)
713 {
714 	snmp_mib_free((void **)ipv6_statistics);
715 	snmp_mib_free((void **)icmpv6_statistics);
716 	snmp_mib_free((void **)icmpv6msg_statistics);
717 	snmp_mib_free((void **)udp_stats_in6);
718 	snmp_mib_free((void **)udplite_stats_in6);
719 }
720 
721 static int inet6_net_init(struct net *net)
722 {
723 	net->ipv6.sysctl.bindv6only = 0;
724 	net->ipv6.sysctl.flush_delay = 0;
725 	net->ipv6.sysctl.ip6_rt_max_size = 4096;
726 	net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
727 	net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
728 	net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
729 	net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
730 	net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
731 	net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
732 	net->ipv6.sysctl.icmpv6_time = 1*HZ;
733 
734 	return 0;
735 }
736 
737 static void inet6_net_exit(struct net *net)
738 {
739 	return;
740 }
741 
742 static struct pernet_operations inet6_net_ops = {
743 	.init = inet6_net_init,
744 	.exit = inet6_net_exit,
745 };
746 
747 static int __init inet6_init(void)
748 {
749 	struct sk_buff *dummy_skb;
750 	struct list_head *r;
751 	int err;
752 
753 	BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
754 
755 #ifdef MODULE
756 #if 0 /* FIXME --RR */
757 	if (!mod_member_present(&__this_module, can_unload))
758 	  return -EINVAL;
759 
760 	__this_module.can_unload = &ipv6_unload;
761 #endif
762 #endif
763 	err = proto_register(&tcpv6_prot, 1);
764 	if (err)
765 		goto out;
766 
767 	err = proto_register(&udpv6_prot, 1);
768 	if (err)
769 		goto out_unregister_tcp_proto;
770 
771 	err = proto_register(&udplitev6_prot, 1);
772 	if (err)
773 		goto out_unregister_udp_proto;
774 
775 	err = proto_register(&rawv6_prot, 1);
776 	if (err)
777 		goto out_unregister_udplite_proto;
778 
779 
780 	/* Register the socket-side information for inet6_create.  */
781 	for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
782 		INIT_LIST_HEAD(r);
783 
784 	/* We MUST register RAW sockets before we create the ICMP6,
785 	 * IGMP6, or NDISC control sockets.
786 	 */
787 	err = rawv6_init();
788 	if (err)
789 		goto out_unregister_raw_proto;
790 
791 	/* Register the family here so that the init calls below will
792 	 * be able to create sockets. (?? is this dangerous ??)
793 	 */
794 	err = sock_register(&inet6_family_ops);
795 	if (err)
796 		goto out_sock_register_fail;
797 
798 	/* Initialise ipv6 mibs */
799 	err = init_ipv6_mibs();
800 	if (err)
801 		goto out_unregister_sock;
802 
803 	/*
804 	 *	ipngwg API draft makes clear that the correct semantics
805 	 *	for TCP and UDP is to consider one TCP and UDP instance
806 	 *	in a host availiable by both INET and INET6 APIs and
807 	 *	able to communicate via both network protocols.
808 	 */
809 
810 	err = register_pernet_subsys(&inet6_net_ops);
811 	if (err)
812 		goto register_pernet_fail;
813 
814 #ifdef CONFIG_SYSCTL
815 	err = ipv6_sysctl_register();
816 	if (err)
817 		goto sysctl_fail;
818 #endif
819 	err = icmpv6_init(&inet6_family_ops);
820 	if (err)
821 		goto icmp_fail;
822 	err = ndisc_init(&inet6_family_ops);
823 	if (err)
824 		goto ndisc_fail;
825 	err = igmp6_init(&inet6_family_ops);
826 	if (err)
827 		goto igmp_fail;
828 	err = ipv6_netfilter_init();
829 	if (err)
830 		goto netfilter_fail;
831 	/* Create /proc/foo6 entries. */
832 #ifdef CONFIG_PROC_FS
833 	err = -ENOMEM;
834 	if (raw6_proc_init())
835 		goto proc_raw6_fail;
836 	if (tcp6_proc_init())
837 		goto proc_tcp6_fail;
838 	if (udp6_proc_init())
839 		goto proc_udp6_fail;
840 	if (udplite6_proc_init())
841 		goto proc_udplite6_fail;
842 	if (ipv6_misc_proc_init())
843 		goto proc_misc6_fail;
844 
845 	if (ac6_proc_init())
846 		goto proc_anycast6_fail;
847 	if (if6_proc_init())
848 		goto proc_if6_fail;
849 #endif
850 	err = ip6_route_init();
851 	if (err)
852 		goto ip6_route_fail;
853 	err = ip6_flowlabel_init();
854 	if (err)
855 		goto ip6_flowlabel_fail;
856 	err = addrconf_init();
857 	if (err)
858 		goto addrconf_fail;
859 
860 	/* Init v6 extension headers. */
861 	err = ipv6_exthdrs_init();
862 	if (err)
863 		goto ipv6_exthdrs_fail;
864 
865 	err = ipv6_frag_init();
866 	if (err)
867 		goto ipv6_frag_fail;
868 
869 	/* Init v6 transport protocols. */
870 	err = udpv6_init();
871 	if (err)
872 		goto udpv6_fail;
873 
874 	err = udplitev6_init();
875 	if (err)
876 		goto udplitev6_fail;
877 
878 	err = tcpv6_init();
879 	if (err)
880 		goto tcpv6_fail;
881 
882 	err = ipv6_packet_init();
883 	if (err)
884 		goto ipv6_packet_fail;
885 out:
886 	return err;
887 
888 ipv6_packet_fail:
889 	tcpv6_exit();
890 tcpv6_fail:
891 	udplitev6_exit();
892 udplitev6_fail:
893 	udpv6_exit();
894 udpv6_fail:
895 	ipv6_frag_exit();
896 ipv6_frag_fail:
897 	ipv6_exthdrs_exit();
898 ipv6_exthdrs_fail:
899 	addrconf_cleanup();
900 addrconf_fail:
901 	ip6_flowlabel_cleanup();
902 ip6_flowlabel_fail:
903 	ip6_route_cleanup();
904 ip6_route_fail:
905 #ifdef CONFIG_PROC_FS
906 	if6_proc_exit();
907 proc_if6_fail:
908 	ac6_proc_exit();
909 proc_anycast6_fail:
910 	ipv6_misc_proc_exit();
911 proc_misc6_fail:
912 	udplite6_proc_exit();
913 proc_udplite6_fail:
914 	udp6_proc_exit();
915 proc_udp6_fail:
916 	tcp6_proc_exit();
917 proc_tcp6_fail:
918 	raw6_proc_exit();
919 proc_raw6_fail:
920 #endif
921 	ipv6_netfilter_fini();
922 netfilter_fail:
923 	igmp6_cleanup();
924 igmp_fail:
925 	ndisc_cleanup();
926 ndisc_fail:
927 	icmpv6_cleanup();
928 icmp_fail:
929 #ifdef CONFIG_SYSCTL
930 	ipv6_sysctl_unregister();
931 sysctl_fail:
932 #endif
933 	unregister_pernet_subsys(&inet6_net_ops);
934 register_pernet_fail:
935 	cleanup_ipv6_mibs();
936 out_unregister_sock:
937 	sock_unregister(PF_INET6);
938 	rtnl_unregister_all(PF_INET6);
939 out_sock_register_fail:
940 	rawv6_exit();
941 out_unregister_raw_proto:
942 	proto_unregister(&rawv6_prot);
943 out_unregister_udplite_proto:
944 	proto_unregister(&udplitev6_prot);
945 out_unregister_udp_proto:
946 	proto_unregister(&udpv6_prot);
947 out_unregister_tcp_proto:
948 	proto_unregister(&tcpv6_prot);
949 	goto out;
950 }
951 module_init(inet6_init);
952 
953 static void __exit inet6_exit(void)
954 {
955 	/* First of all disallow new sockets creation. */
956 	sock_unregister(PF_INET6);
957 	/* Disallow any further netlink messages */
958 	rtnl_unregister_all(PF_INET6);
959 
960 	udpv6_exit();
961 	udplitev6_exit();
962 	tcpv6_exit();
963 
964 	/* Cleanup code parts. */
965 	ipv6_packet_cleanup();
966 	ipv6_frag_exit();
967 	ipv6_exthdrs_exit();
968 	addrconf_cleanup();
969 	ip6_flowlabel_cleanup();
970 	ip6_route_cleanup();
971 #ifdef CONFIG_PROC_FS
972 
973 	/* Cleanup code parts. */
974 	if6_proc_exit();
975 	ac6_proc_exit();
976 	ipv6_misc_proc_exit();
977 	udplite6_proc_exit();
978 	udp6_proc_exit();
979 	tcp6_proc_exit();
980 	raw6_proc_exit();
981 #endif
982 	ipv6_netfilter_fini();
983 	igmp6_cleanup();
984 	ndisc_cleanup();
985 	icmpv6_cleanup();
986 	rawv6_exit();
987 #ifdef CONFIG_SYSCTL
988 	ipv6_sysctl_unregister();
989 #endif
990 	unregister_pernet_subsys(&inet6_net_ops);
991 	cleanup_ipv6_mibs();
992 	proto_unregister(&rawv6_prot);
993 	proto_unregister(&udplitev6_prot);
994 	proto_unregister(&udpv6_prot);
995 	proto_unregister(&tcpv6_prot);
996 }
997 module_exit(inet6_exit);
998 
999 MODULE_ALIAS_NETPROTO(PF_INET6);
1000