ipv6_sockglue.c revision a51482bde22f99c63fbbb57d5d46cc666384e379 
1/*
2 *	IPv6 BSD socket options interface
3 *	Linux INET6 implementation
4 *
5 *	Authors:
6 *	Pedro Roque		<roque@di.fc.ul.pt>
7 *
8 *	Based on linux/net/ipv4/ip_sockglue.c
9 *
10 *	$Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
11 *
12 *	This program is free software; you can redistribute it and/or
13 *      modify it under the terms of the GNU General Public License
14 *      as published by the Free Software Foundation; either version
15 *      2 of the License, or (at your option) any later version.
16 *
17 *	FIXME: Make the setsockopt code POSIX compliant: That is
18 *
19 *	o	Return -EINVAL for setsockopt of short lengths
20 *	o	Truncate getsockopt returns
21 *	o	Return an optlen of the truncated length if need be
22 *
23 *	Changes:
24 *	David L Stevens <dlstevens@us.ibm.com>:
25 *		- added multicast source filtering API for MLDv2
26 */
27
28#include <linux/module.h>
29#include <linux/config.h>
30#include <linux/errno.h>
31#include <linux/types.h>
32#include <linux/socket.h>
33#include <linux/sockios.h>
34#include <linux/sched.h>
35#include <linux/net.h>
36#include <linux/in6.h>
37#include <linux/netdevice.h>
38#include <linux/if_arp.h>
39#include <linux/init.h>
40#include <linux/sysctl.h>
41#include <linux/netfilter.h>
42
43#include <net/sock.h>
44#include <net/snmp.h>
45#include <net/ipv6.h>
46#include <net/ndisc.h>
47#include <net/protocol.h>
48#include <net/transp_v6.h>
49#include <net/ip6_route.h>
50#include <net/addrconf.h>
51#include <net/inet_common.h>
52#include <net/tcp.h>
53#include <net/udp.h>
54#include <net/xfrm.h>
55
56#include <asm/uaccess.h>
57
58DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
59
60static struct packet_type ipv6_packet_type = {
61	.type = __constant_htons(ETH_P_IPV6),
62	.func = ipv6_rcv,
63};
64
65struct ip6_ra_chain *ip6_ra_chain;
66DEFINE_RWLOCK(ip6_ra_lock);
67
68int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
69{
70	struct ip6_ra_chain *ra, *new_ra, **rap;
71
72	/* RA packet may be delivered ONLY to IPPROTO_RAW socket */
73	if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
74		return -EINVAL;
75
76	new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
77
78	write_lock_bh(&ip6_ra_lock);
79	for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
80		if (ra->sk == sk) {
81			if (sel>=0) {
82				write_unlock_bh(&ip6_ra_lock);
83				kfree(new_ra);
84				return -EADDRINUSE;
85			}
86
87			*rap = ra->next;
88			write_unlock_bh(&ip6_ra_lock);
89
90			if (ra->destructor)
91				ra->destructor(sk);
92			sock_put(sk);
93			kfree(ra);
94			return 0;
95		}
96	}
97	if (new_ra == NULL) {
98		write_unlock_bh(&ip6_ra_lock);
99		return -ENOBUFS;
100	}
101	new_ra->sk = sk;
102	new_ra->sel = sel;
103	new_ra->destructor = destructor;
104	new_ra->next = ra;
105	*rap = new_ra;
106	sock_hold(sk);
107	write_unlock_bh(&ip6_ra_lock);
108	return 0;
109}
110
111int ipv6_setsockopt(struct sock *sk, int level, int optname,
112		    char __user *optval, int optlen)
113{
114	struct ipv6_pinfo *np = inet6_sk(sk);
115	int val, valbool;
116	int retv = -ENOPROTOOPT;
117
118	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
119		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
120
121	if(level!=SOL_IPV6)
122		goto out;
123
124	if (optval == NULL)
125		val=0;
126	else if (get_user(val, (int __user *) optval))
127		return -EFAULT;
128
129	valbool = (val!=0);
130
131	lock_sock(sk);
132
133	switch (optname) {
134
135	case IPV6_ADDRFORM:
136		if (val == PF_INET) {
137			struct ipv6_txoptions *opt;
138			struct sk_buff *pktopt;
139
140			if (sk->sk_protocol != IPPROTO_UDP &&
141			    sk->sk_protocol != IPPROTO_TCP)
142				break;
143
144			if (sk->sk_state != TCP_ESTABLISHED) {
145				retv = -ENOTCONN;
146				break;
147			}
148
149			if (ipv6_only_sock(sk) ||
150			    !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
151				retv = -EADDRNOTAVAIL;
152				break;
153			}
154
155			fl6_free_socklist(sk);
156			ipv6_sock_mc_close(sk);
157
158			/*
159			 * Sock is moving from IPv6 to IPv4 (sk_prot), so
160			 * remove it from the refcnt debug socks count in the
161			 * original family...
162			 */
163			sk_refcnt_debug_dec(sk);
164
165			if (sk->sk_protocol == IPPROTO_TCP) {
166				struct tcp_sock *tp = tcp_sk(sk);
167
168				local_bh_disable();
169				sock_prot_dec_use(sk->sk_prot);
170				sock_prot_inc_use(&tcp_prot);
171				local_bh_enable();
172				sk->sk_prot = &tcp_prot;
173				tp->af_specific = &ipv4_specific;
174				sk->sk_socket->ops = &inet_stream_ops;
175				sk->sk_family = PF_INET;
176				tcp_sync_mss(sk, tp->pmtu_cookie);
177			} else {
178				local_bh_disable();
179				sock_prot_dec_use(sk->sk_prot);
180				sock_prot_inc_use(&udp_prot);
181				local_bh_enable();
182				sk->sk_prot = &udp_prot;
183				sk->sk_socket->ops = &inet_dgram_ops;
184				sk->sk_family = PF_INET;
185			}
186			opt = xchg(&np->opt, NULL);
187			if (opt)
188				sock_kfree_s(sk, opt, opt->tot_len);
189			pktopt = xchg(&np->pktoptions, NULL);
190			if (pktopt)
191				kfree_skb(pktopt);
192
193			sk->sk_destruct = inet_sock_destruct;
194			/*
195			 * ... and add it to the refcnt debug socks count
196			 * in the new family. -acme
197			 */
198			sk_refcnt_debug_inc(sk);
199			module_put(THIS_MODULE);
200			retv = 0;
201			break;
202		}
203		goto e_inval;
204
205	case IPV6_V6ONLY:
206		if (inet_sk(sk)->num)
207			goto e_inval;
208		np->ipv6only = valbool;
209		retv = 0;
210		break;
211
212	case IPV6_RECVPKTINFO:
213		np->rxopt.bits.rxinfo = valbool;
214		retv = 0;
215		break;
216
217	case IPV6_2292PKTINFO:
218		np->rxopt.bits.rxoinfo = valbool;
219		retv = 0;
220		break;
221
222	case IPV6_RECVHOPLIMIT:
223		np->rxopt.bits.rxhlim = valbool;
224		retv = 0;
225		break;
226
227	case IPV6_2292HOPLIMIT:
228		np->rxopt.bits.rxohlim = valbool;
229		retv = 0;
230		break;
231
232	case IPV6_RECVRTHDR:
233		if (val < 0 || val > 2)
234			goto e_inval;
235		np->rxopt.bits.srcrt = val;
236		retv = 0;
237		break;
238
239	case IPV6_2292RTHDR:
240		if (val < 0 || val > 2)
241			goto e_inval;
242		np->rxopt.bits.osrcrt = val;
243		retv = 0;
244		break;
245
246	case IPV6_RECVHOPOPTS:
247		np->rxopt.bits.hopopts = valbool;
248		retv = 0;
249		break;
250
251	case IPV6_2292HOPOPTS:
252		np->rxopt.bits.ohopopts = valbool;
253		retv = 0;
254		break;
255
256	case IPV6_RECVDSTOPTS:
257		np->rxopt.bits.dstopts = valbool;
258		retv = 0;
259		break;
260
261	case IPV6_2292DSTOPTS:
262		np->rxopt.bits.odstopts = valbool;
263		retv = 0;
264		break;
265
266	case IPV6_TCLASS:
267		if (val < 0 || val > 0xff)
268			goto e_inval;
269		np->tclass = val;
270		retv = 0;
271		break;
272
273	case IPV6_RECVTCLASS:
274		np->rxopt.bits.rxtclass = valbool;
275		retv = 0;
276		break;
277
278	case IPV6_FLOWINFO:
279		np->rxopt.bits.rxflow = valbool;
280		retv = 0;
281		break;
282
283	case IPV6_HOPOPTS:
284	case IPV6_RTHDRDSTOPTS:
285	case IPV6_RTHDR:
286	case IPV6_DSTOPTS:
287	{
288		struct ipv6_txoptions *opt;
289		if (optlen == 0)
290			optval = 0;
291
292		/* hop-by-hop / destination options are privileged option */
293		retv = -EPERM;
294		if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
295			break;
296
297		retv = -EINVAL;
298		if (optlen & 0x7 || optlen > 8 * 255)
299			break;
300
301		opt = ipv6_renew_options(sk, np->opt, optname,
302					 (struct ipv6_opt_hdr __user *)optval,
303					 optlen);
304		if (IS_ERR(opt)) {
305			retv = PTR_ERR(opt);
306			break;
307		}
308
309		/* routing header option needs extra check */
310		if (optname == IPV6_RTHDR && opt->srcrt) {
311			struct ipv6_rt_hdr *rthdr = opt->srcrt;
312			if (rthdr->type)
313				goto sticky_done;
314			if ((rthdr->hdrlen & 1) ||
315			    (rthdr->hdrlen >> 1) != rthdr->segments_left)
316				goto sticky_done;
317		}
318
319		retv = 0;
320		if (sk->sk_type == SOCK_STREAM) {
321			if (opt) {
322				struct tcp_sock *tp = tcp_sk(sk);
323				if (!((1 << sk->sk_state) &
324				      (TCPF_LISTEN | TCPF_CLOSE))
325				    && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
326					tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
327					tcp_sync_mss(sk, tp->pmtu_cookie);
328				}
329			}
330			opt = xchg(&np->opt, opt);
331			sk_dst_reset(sk);
332		} else {
333			write_lock(&sk->sk_dst_lock);
334			opt = xchg(&np->opt, opt);
335			write_unlock(&sk->sk_dst_lock);
336			sk_dst_reset(sk);
337		}
338sticky_done:
339		if (opt)
340			sock_kfree_s(sk, opt, opt->tot_len);
341		break;
342	}
343
344	case IPV6_2292PKTOPTIONS:
345	{
346		struct ipv6_txoptions *opt = NULL;
347		struct msghdr msg;
348		struct flowi fl;
349		int junk;
350
351		fl.fl6_flowlabel = 0;
352		fl.oif = sk->sk_bound_dev_if;
353
354		if (optlen == 0)
355			goto update;
356
357		/* 1K is probably excessive
358		 * 1K is surely not enough, 2K per standard header is 16K.
359		 */
360		retv = -EINVAL;
361		if (optlen > 64*1024)
362			break;
363
364		opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
365		retv = -ENOBUFS;
366		if (opt == NULL)
367			break;
368
369		memset(opt, 0, sizeof(*opt));
370		opt->tot_len = sizeof(*opt) + optlen;
371		retv = -EFAULT;
372		if (copy_from_user(opt+1, optval, optlen))
373			goto done;
374
375		msg.msg_controllen = optlen;
376		msg.msg_control = (void*)(opt+1);
377
378		retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
379		if (retv)
380			goto done;
381update:
382		retv = 0;
383		if (sk->sk_type == SOCK_STREAM) {
384			if (opt) {
385				struct tcp_sock *tp = tcp_sk(sk);
386				if (!((1 << sk->sk_state) &
387				      (TCPF_LISTEN | TCPF_CLOSE))
388				    && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
389					tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
390					tcp_sync_mss(sk, tp->pmtu_cookie);
391				}
392			}
393			opt = xchg(&np->opt, opt);
394			sk_dst_reset(sk);
395		} else {
396			write_lock(&sk->sk_dst_lock);
397			opt = xchg(&np->opt, opt);
398			write_unlock(&sk->sk_dst_lock);
399			sk_dst_reset(sk);
400		}
401
402done:
403		if (opt)
404			sock_kfree_s(sk, opt, opt->tot_len);
405		break;
406	}
407	case IPV6_UNICAST_HOPS:
408		if (val > 255 || val < -1)
409			goto e_inval;
410		np->hop_limit = val;
411		retv = 0;
412		break;
413
414	case IPV6_MULTICAST_HOPS:
415		if (sk->sk_type == SOCK_STREAM)
416			goto e_inval;
417		if (val > 255 || val < -1)
418			goto e_inval;
419		np->mcast_hops = val;
420		retv = 0;
421		break;
422
423	case IPV6_MULTICAST_LOOP:
424		np->mc_loop = valbool;
425		retv = 0;
426		break;
427
428	case IPV6_MULTICAST_IF:
429		if (sk->sk_type == SOCK_STREAM)
430			goto e_inval;
431		if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
432			goto e_inval;
433
434		if (__dev_get_by_index(val) == NULL) {
435			retv = -ENODEV;
436			break;
437		}
438		np->mcast_oif = val;
439		retv = 0;
440		break;
441	case IPV6_ADD_MEMBERSHIP:
442	case IPV6_DROP_MEMBERSHIP:
443	{
444		struct ipv6_mreq mreq;
445
446		retv = -EFAULT;
447		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
448			break;
449
450		if (optname == IPV6_ADD_MEMBERSHIP)
451			retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
452		else
453			retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
454		break;
455	}
456	case IPV6_JOIN_ANYCAST:
457	case IPV6_LEAVE_ANYCAST:
458	{
459		struct ipv6_mreq mreq;
460
461		if (optlen != sizeof(struct ipv6_mreq))
462			goto e_inval;
463
464		retv = -EFAULT;
465		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
466			break;
467
468		if (optname == IPV6_JOIN_ANYCAST)
469			retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
470		else
471			retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
472		break;
473	}
474	case MCAST_JOIN_GROUP:
475	case MCAST_LEAVE_GROUP:
476	{
477		struct group_req greq;
478		struct sockaddr_in6 *psin6;
479
480		retv = -EFAULT;
481		if (copy_from_user(&greq, optval, sizeof(struct group_req)))
482			break;
483		if (greq.gr_group.ss_family != AF_INET6) {
484			retv = -EADDRNOTAVAIL;
485			break;
486		}
487		psin6 = (struct sockaddr_in6 *)&greq.gr_group;
488		if (optname == MCAST_JOIN_GROUP)
489			retv = ipv6_sock_mc_join(sk, greq.gr_interface,
490				&psin6->sin6_addr);
491		else
492			retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
493				&psin6->sin6_addr);
494		break;
495	}
496	case MCAST_JOIN_SOURCE_GROUP:
497	case MCAST_LEAVE_SOURCE_GROUP:
498	case MCAST_BLOCK_SOURCE:
499	case MCAST_UNBLOCK_SOURCE:
500	{
501		struct group_source_req greqs;
502		int omode, add;
503
504		if (optlen != sizeof(struct group_source_req))
505			goto e_inval;
506		if (copy_from_user(&greqs, optval, sizeof(greqs))) {
507			retv = -EFAULT;
508			break;
509		}
510		if (greqs.gsr_group.ss_family != AF_INET6 ||
511		    greqs.gsr_source.ss_family != AF_INET6) {
512			retv = -EADDRNOTAVAIL;
513			break;
514		}
515		if (optname == MCAST_BLOCK_SOURCE) {
516			omode = MCAST_EXCLUDE;
517			add = 1;
518		} else if (optname == MCAST_UNBLOCK_SOURCE) {
519			omode = MCAST_EXCLUDE;
520			add = 0;
521		} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
522			struct sockaddr_in6 *psin6;
523
524			psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
525			retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
526				&psin6->sin6_addr);
527			/* prior join w/ different source is ok */
528			if (retv && retv != -EADDRINUSE)
529				break;
530			omode = MCAST_INCLUDE;
531			add = 1;
532		} else /* MCAST_LEAVE_SOURCE_GROUP */ {
533			omode = MCAST_INCLUDE;
534			add = 0;
535		}
536		retv = ip6_mc_source(add, omode, sk, &greqs);
537		break;
538	}
539	case MCAST_MSFILTER:
540	{
541		extern int sysctl_mld_max_msf;
542		struct group_filter *gsf;
543
544		if (optlen < GROUP_FILTER_SIZE(0))
545			goto e_inval;
546		if (optlen > sysctl_optmem_max) {
547			retv = -ENOBUFS;
548			break;
549		}
550		gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
551		if (gsf == 0) {
552			retv = -ENOBUFS;
553			break;
554		}
555		retv = -EFAULT;
556		if (copy_from_user(gsf, optval, optlen)) {
557			kfree(gsf);
558			break;
559		}
560		/* numsrc >= (4G-140)/128 overflow in 32 bits */
561		if (gsf->gf_numsrc >= 0x1ffffffU ||
562		    gsf->gf_numsrc > sysctl_mld_max_msf) {
563			kfree(gsf);
564			retv = -ENOBUFS;
565			break;
566		}
567		if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
568			kfree(gsf);
569			retv = -EINVAL;
570			break;
571		}
572		retv = ip6_mc_msfilter(sk, gsf);
573		kfree(gsf);
574
575		break;
576	}
577	case IPV6_ROUTER_ALERT:
578		retv = ip6_ra_control(sk, val, NULL);
579		break;
580	case IPV6_MTU_DISCOVER:
581		if (val<0 || val>2)
582			goto e_inval;
583		np->pmtudisc = val;
584		retv = 0;
585		break;
586	case IPV6_MTU:
587		if (val && val < IPV6_MIN_MTU)
588			goto e_inval;
589		np->frag_size = val;
590		retv = 0;
591		break;
592	case IPV6_RECVERR:
593		np->recverr = valbool;
594		if (!val)
595			skb_queue_purge(&sk->sk_error_queue);
596		retv = 0;
597		break;
598	case IPV6_FLOWINFO_SEND:
599		np->sndflow = valbool;
600		retv = 0;
601		break;
602	case IPV6_FLOWLABEL_MGR:
603		retv = ipv6_flowlabel_opt(sk, optval, optlen);
604		break;
605	case IPV6_IPSEC_POLICY:
606	case IPV6_XFRM_POLICY:
607		retv = -EPERM;
608		if (!capable(CAP_NET_ADMIN))
609			break;
610		retv = xfrm_user_policy(sk, optname, optval, optlen);
611		break;
612
613#ifdef CONFIG_NETFILTER
614	default:
615		retv = nf_setsockopt(sk, PF_INET6, optname, optval,
616					    optlen);
617		break;
618#endif
619
620	}
621	release_sock(sk);
622
623out:
624	return retv;
625
626e_inval:
627	release_sock(sk);
628	return -EINVAL;
629}
630
631int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
632			   char __user *optval, int len)
633{
634	if (!hdr)
635		return 0;
636	len = min_t(int, len, ipv6_optlen(hdr));
637	if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
638		return -EFAULT;
639	return len;
640}
641
642int ipv6_getsockopt(struct sock *sk, int level, int optname,
643		    char __user *optval, int __user *optlen)
644{
645	struct ipv6_pinfo *np = inet6_sk(sk);
646	int len;
647	int val;
648
649	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
650		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
651	if(level!=SOL_IPV6)
652		return -ENOPROTOOPT;
653	if (get_user(len, optlen))
654		return -EFAULT;
655	switch (optname) {
656	case IPV6_ADDRFORM:
657		if (sk->sk_protocol != IPPROTO_UDP &&
658		    sk->sk_protocol != IPPROTO_TCP)
659			return -EINVAL;
660		if (sk->sk_state != TCP_ESTABLISHED)
661			return -ENOTCONN;
662		val = sk->sk_family;
663		break;
664	case MCAST_MSFILTER:
665	{
666		struct group_filter gsf;
667		int err;
668
669		if (len < GROUP_FILTER_SIZE(0))
670			return -EINVAL;
671		if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
672			return -EFAULT;
673		lock_sock(sk);
674		err = ip6_mc_msfget(sk, &gsf,
675			(struct group_filter __user *)optval, optlen);
676		release_sock(sk);
677		return err;
678	}
679
680	case IPV6_2292PKTOPTIONS:
681	{
682		struct msghdr msg;
683		struct sk_buff *skb;
684
685		if (sk->sk_type != SOCK_STREAM)
686			return -ENOPROTOOPT;
687
688		msg.msg_control = optval;
689		msg.msg_controllen = len;
690		msg.msg_flags = 0;
691
692		lock_sock(sk);
693		skb = np->pktoptions;
694		if (skb)
695			atomic_inc(&skb->users);
696		release_sock(sk);
697
698		if (skb) {
699			int err = datagram_recv_ctl(sk, &msg, skb);
700			kfree_skb(skb);
701			if (err)
702				return err;
703		} else {
704			if (np->rxopt.bits.rxinfo) {
705				struct in6_pktinfo src_info;
706				src_info.ipi6_ifindex = np->mcast_oif;
707				ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
708				put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
709			}
710			if (np->rxopt.bits.rxhlim) {
711				int hlim = np->mcast_hops;
712				put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
713			}
714			if (np->rxopt.bits.rxoinfo) {
715				struct in6_pktinfo src_info;
716				src_info.ipi6_ifindex = np->mcast_oif;
717				ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
718				put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
719			}
720			if (np->rxopt.bits.rxohlim) {
721				int hlim = np->mcast_hops;
722				put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
723			}
724		}
725		len -= msg.msg_controllen;
726		return put_user(len, optlen);
727	}
728	case IPV6_MTU:
729	{
730		struct dst_entry *dst;
731		val = 0;
732		lock_sock(sk);
733		dst = sk_dst_get(sk);
734		if (dst) {
735			val = dst_mtu(dst);
736			dst_release(dst);
737		}
738		release_sock(sk);
739		if (!val)
740			return -ENOTCONN;
741		break;
742	}
743
744	case IPV6_V6ONLY:
745		val = np->ipv6only;
746		break;
747
748	case IPV6_RECVPKTINFO:
749		val = np->rxopt.bits.rxinfo;
750		break;
751
752	case IPV6_2292PKTINFO:
753		val = np->rxopt.bits.rxoinfo;
754		break;
755
756	case IPV6_RECVHOPLIMIT:
757		val = np->rxopt.bits.rxhlim;
758		break;
759
760	case IPV6_2292HOPLIMIT:
761		val = np->rxopt.bits.rxohlim;
762		break;
763
764	case IPV6_RECVRTHDR:
765		val = np->rxopt.bits.srcrt;
766		break;
767
768	case IPV6_2292RTHDR:
769		val = np->rxopt.bits.osrcrt;
770		break;
771
772	case IPV6_HOPOPTS:
773	case IPV6_RTHDRDSTOPTS:
774	case IPV6_RTHDR:
775	case IPV6_DSTOPTS:
776	{
777
778		lock_sock(sk);
779		len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
780					     optval, len);
781		release_sock(sk);
782		return put_user(len, optlen);
783	}
784
785	case IPV6_RECVHOPOPTS:
786		val = np->rxopt.bits.hopopts;
787		break;
788
789	case IPV6_2292HOPOPTS:
790		val = np->rxopt.bits.ohopopts;
791		break;
792
793	case IPV6_RECVDSTOPTS:
794		val = np->rxopt.bits.dstopts;
795		break;
796
797	case IPV6_2292DSTOPTS:
798		val = np->rxopt.bits.odstopts;
799		break;
800
801	case IPV6_TCLASS:
802		val = np->tclass;
803		break;
804
805	case IPV6_RECVTCLASS:
806		val = np->rxopt.bits.rxtclass;
807		break;
808
809	case IPV6_FLOWINFO:
810		val = np->rxopt.bits.rxflow;
811		break;
812
813	case IPV6_UNICAST_HOPS:
814		val = np->hop_limit;
815		break;
816
817	case IPV6_MULTICAST_HOPS:
818		val = np->mcast_hops;
819		break;
820
821	case IPV6_MULTICAST_LOOP:
822		val = np->mc_loop;
823		break;
824
825	case IPV6_MULTICAST_IF:
826		val = np->mcast_oif;
827		break;
828
829	case IPV6_MTU_DISCOVER:
830		val = np->pmtudisc;
831		break;
832
833	case IPV6_RECVERR:
834		val = np->recverr;
835		break;
836
837	case IPV6_FLOWINFO_SEND:
838		val = np->sndflow;
839		break;
840
841	default:
842#ifdef CONFIG_NETFILTER
843		lock_sock(sk);
844		val = nf_getsockopt(sk, PF_INET6, optname, optval,
845				    &len);
846		release_sock(sk);
847		if (val >= 0)
848			val = put_user(len, optlen);
849		return val;
850#else
851		return -EINVAL;
852#endif
853	}
854	len = min_t(unsigned int, sizeof(int), len);
855	if(put_user(len, optlen))
856		return -EFAULT;
857	if(copy_to_user(optval,&val,len))
858		return -EFAULT;
859	return 0;
860}
861
862void __init ipv6_packet_init(void)
863{
864	dev_add_pack(&ipv6_packet_type);
865}
866
867void ipv6_packet_cleanup(void)
868{
869	dev_remove_pack(&ipv6_packet_type);
870}
871