[net-next-2.6.git] / net / ipv6 / ip6_input.c

/*
 *	IPv6 input
 *	Linux INET6 implementation
 *
 *	Authors:
 *	Pedro Roque		<roque@di.fc.ul.pt>
 *	Ian P. Morris		<I.P.Morris@soton.ac.uk>
 *
 *	Based in linux/net/ipv4/ip_input.c
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */
/* Changes
 *
 * 	Mitsuru KANDA @USAGI and
 * 	YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs().
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/in6.h>
#include <linux/icmpv6.h>
#include <linux/mroute6.h>

#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>

#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/rawv6.h>
#include <net/ndisc.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/xfrm.h>


inline int ip6_rcv_finish( struct sk_buff *skb)
{
	if (skb->dst == NULL)
		ip6_route_input(skb);

	return dst_input(skb);
}

int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
	struct ipv6hdr *hdr;
	u32 		pkt_len;
	struct inet6_dev *idev;
	struct net *net = dev_net(skb->dev);

	if (skb->pkt_type == PACKET_OTHERHOST) {
		kfree_skb(skb);
		return 0;
	}

	rcu_read_lock();

	idev = __in6_dev_get(skb->dev);

	IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_IN, skb->len);

	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
	    !idev || unlikely(idev->cnf.disable_ipv6)) {
		IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
		goto drop;
	}

	memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));

	/*
	 * Store incoming device index. When the packet will
	 * be queued, we cannot refer to skb->dev anymore.
	 *
	 * BTW, when we send a packet for our own local address on a
	 * non-loopback interface (e.g. ethX), it is being delivered
	 * via the loopback interface (lo) here; skb->dev = loopback_dev.
	 * It, however, should be considered as if it is being
	 * arrived via the sending interface (ethX), because of the
	 * nature of scoping architecture. --yoshfuji
	 */
	IP6CB(skb)->iif = skb->dst ? ip6_dst_idev(skb->dst)->dev->ifindex : dev->ifindex;

	if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
		goto err;

	hdr = ipv6_hdr(skb);

	if (hdr->version != 6)
		goto err;

	/*
	 * RFC4291 2.5.3
	 * A packet received on an interface with a destination address
	 * of loopback must be dropped.
	 */
	if (!(dev->flags & IFF_LOOPBACK) &&
	    ipv6_addr_loopback(&hdr->daddr))
		goto err;

	skb->transport_header = skb->network_header + sizeof(*hdr);
	IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);

	pkt_len = ntohs(hdr->payload_len);

	/* pkt_len may be zero if Jumbo payload option is present */
	if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
		if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
			IP6_INC_STATS_BH(net,
					 idev, IPSTATS_MIB_INTRUNCATEDPKTS);
			goto drop;
		}
		if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
			IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
			goto drop;
		}
		hdr = ipv6_hdr(skb);
	}

	if (hdr->nexthdr == NEXTHDR_HOP) {
		if (ipv6_parse_hopopts(skb) < 0) {
			IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
			rcu_read_unlock();
			return 0;
		}
	}

	rcu_read_unlock();

	return NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, dev, NULL,
		       ip6_rcv_finish);
err:
	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
drop:
	rcu_read_unlock();
	kfree_skb(skb);
	return 0;
}

/*
 *	Deliver the packet to the host
 */


static int ip6_input_finish(struct sk_buff *skb)
{
	struct inet6_protocol *ipprot;
	unsigned int nhoff;
	int nexthdr, raw;
	u8 hash;
	struct inet6_dev *idev;
	struct net *net = dev_net(skb->dst->dev);

	/*
	 *	Parse extension headers
	 */

	rcu_read_lock();
resubmit:
	idev = ip6_dst_idev(skb->dst);
	if (!pskb_pull(skb, skb_transport_offset(skb)))
		goto discard;
	nhoff = IP6CB(skb)->nhoff;
	nexthdr = skb_network_header(skb)[nhoff];

	raw = raw6_local_deliver(skb, nexthdr);

	hash = nexthdr & (MAX_INET_PROTOS - 1);
	if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) {
		int ret;

		if (ipprot->flags & INET6_PROTO_FINAL) {
			struct ipv6hdr *hdr;

			/* Free reference early: we don't need it any more,
			   and it may hold ip_conntrack module loaded
			   indefinitely. */
			nf_reset(skb);

			skb_postpull_rcsum(skb, skb_network_header(skb),
					   skb_network_header_len(skb));
			hdr = ipv6_hdr(skb);
			if (ipv6_addr_is_multicast(&hdr->daddr) &&
			    !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
			    &hdr->saddr) &&
			    !ipv6_is_mld(skb, nexthdr))
				goto discard;
		}
		if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
		    !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
			goto discard;

		ret = ipprot->handler(skb);
		if (ret > 0)
			goto resubmit;
		else if (ret == 0)
			IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
	} else {
		if (!raw) {
			if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
				IP6_INC_STATS_BH(net, idev,
						 IPSTATS_MIB_INUNKNOWNPROTOS);
				icmpv6_send(skb, ICMPV6_PARAMPROB,
					    ICMPV6_UNK_NEXTHDR, nhoff,
					    skb->dev);
			}
		} else
			IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
		kfree_skb(skb);
	}
	rcu_read_unlock();
	return 0;

discard:
	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
	rcu_read_unlock();
	kfree_skb(skb);
	return 0;
}


int ip6_input(struct sk_buff *skb)
{
	return NF_HOOK(PF_INET6, NF_INET_LOCAL_IN, skb, skb->dev, NULL,
		       ip6_input_finish);
}

int ip6_mc_input(struct sk_buff *skb)
{
	struct ipv6hdr *hdr;
	int deliver;

	IP6_UPD_PO_STATS_BH(dev_net(skb->dst->dev),
			 ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCAST,
			 skb->len);

	hdr = ipv6_hdr(skb);
	deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);

#ifdef CONFIG_IPV6_MROUTE
	/*
	 *      IPv6 multicast router mode is now supported ;)
	 */
	if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding &&
	    !(ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) &&
	    likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
		/*
		 * Okay, we try to forward - split and duplicate
		 * packets.
		 */
		struct sk_buff *skb2;
		struct inet6_skb_parm *opt = IP6CB(skb);

		/* Check for MLD */
		if (unlikely(opt->ra)) {
			/* Check if this is a mld message */
			u8 *ptr = skb_network_header(skb) + opt->ra;
			struct icmp6hdr *icmp6;
			u8 nexthdr = hdr->nexthdr;
			int offset;

			/* Check if the value of Router Alert
			 * is for MLD (0x0000).
			 */
			if ((ptr[2] | ptr[3]) == 0) {
				deliver = 0;

				if (!ipv6_ext_hdr(nexthdr)) {
					/* BUG */
					goto out;
				}
				offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
							  &nexthdr);
				if (offset < 0)
					goto out;

				if (nexthdr != IPPROTO_ICMPV6)
					goto out;

				if (!pskb_may_pull(skb, (skb_network_header(skb) +
						   offset + 1 - skb->data)))
					goto out;

				icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);

				switch (icmp6->icmp6_type) {
				case ICMPV6_MGM_QUERY:
				case ICMPV6_MGM_REPORT:
				case ICMPV6_MGM_REDUCTION:
				case ICMPV6_MLD2_REPORT:
					deliver = 1;
					break;
				}
				goto out;
			}
			/* unknown RA - process it normally */
		}

		if (deliver)
			skb2 = skb_clone(skb, GFP_ATOMIC);
		else {
			skb2 = skb;
			skb = NULL;
		}

		if (skb2) {
			ip6_mr_input(skb2);
		}
	}
out:
#endif
	if (likely(deliver))
		ip6_input(skb);
	else {
		/* discard */
		kfree_skb(skb);
	}

	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* IPv6 input
1ab1457c	3	* Linux INET6 implementation
1da177e4 LT	4	*
	5	* Authors:
	6	* Pedro Roque <roque@di.fc.ul.pt>
	7	* Ian P. Morris <I.P.Morris@soton.ac.uk>
	8	*
1da177e4 LT	9	* Based in linux/net/ipv4/ip_input.c
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; either version
	14	* 2 of the License, or (at your option) any later version.
	15	*/
	16	/* Changes
	17	*
	18	* Mitsuru KANDA @USAGI and
	19	* YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs().
	20	*/
	21
	22	#include <linux/errno.h>
	23	#include <linux/types.h>
	24	#include <linux/socket.h>
	25	#include <linux/sockios.h>
1da177e4 LT	26	#include <linux/net.h>
	27	#include <linux/netdevice.h>
	28	#include <linux/in6.h>
	29	#include <linux/icmpv6.h>
7bc570c8	30	#include <linux/mroute6.h>
1da177e4 LT	31
	32	#include <linux/netfilter.h>
	33	#include <linux/netfilter_ipv6.h>
	34
	35	#include <net/sock.h>
	36	#include <net/snmp.h>
	37
	38	#include <net/ipv6.h>
	39	#include <net/protocol.h>
	40	#include <net/transp_v6.h>
	41	#include <net/rawv6.h>
	42	#include <net/ndisc.h>
	43	#include <net/ip6_route.h>
	44	#include <net/addrconf.h>
	45	#include <net/xfrm.h>
	46
	47
	48
1ab1457c	49	inline int ip6_rcv_finish( struct sk_buff *skb)
1da177e4 LT	50	{
	51	if (skb->dst == NULL)
	52	ip6_route_input(skb);
	53
	54	return dst_input(skb);
	55	}
	56
f2ccd8fa	57	int ipv6_rcv(struct sk_buff skb, struct net_device dev, struct packet_type pt, struct net_device orig_dev)
1da177e4 LT	58	{
	59	struct ipv6hdr *hdr;
	60	u32 pkt_len;
a11d206d	61	struct inet6_dev *idev;
483a47d2	62	struct net *net = dev_net(skb->dev);
1da177e4	63
a11d206d YH	64	if (skb->pkt_type == PACKET_OTHERHOST) {
	65	kfree_skb(skb);
	66	return 0;
	67	}
	68
	69	rcu_read_lock();
1da177e4	70
a11d206d YH	71	idev = __in6_dev_get(skb->dev);
a11d206d YH	72
edf391ff	73	IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_IN, skb->len);
1da177e4	74
778d80be YH	75	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL \|\|
778d80be YH	76	!idev \|\| unlikely(idev->cnf.disable_ipv6)) {
483a47d2	77	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
71f6f6df	78	goto drop;
1da177e4 LT	79	}
1da177e4 LT	80
6b7fdc3a GC	81	memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
6b7fdc3a GC	82
1da177e4 LT	83	/*
	84	* Store incoming device index. When the packet will
	85	* be queued, we cannot refer to skb->dev anymore.
	86	*
	87	* BTW, when we send a packet for our own local address on a
	88	* non-loopback interface (e.g. ethX), it is being delivered
de3cb747	89	* via the loopback interface (lo) here; skb->dev = loopback_dev.
1da177e4 LT	90	* It, however, should be considered as if it is being
	91	* arrived via the sending interface (ethX), because of the
	92	* nature of scoping architecture. --yoshfuji
	93	*/
7a3025b1	94	IP6CB(skb)->iif = skb->dst ? ip6_dst_idev(skb->dst)->dev->ifindex : dev->ifindex;
1da177e4	95
2889139a	96	if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
1da177e4 LT	97	goto err;
1da177e4 LT	98
0660e03f	99	hdr = ipv6_hdr(skb);
1da177e4 LT	100
	101	if (hdr->version != 6)
	102	goto err;
	103
f630e43a YH	104	/*
	105	* RFC4291 2.5.3
	106	* A packet received on an interface with a destination address
	107	* of loopback must be dropped.
	108	*/
	109	if (!(dev->flags & IFF_LOOPBACK) &&
	110	ipv6_addr_loopback(&hdr->daddr))
	111	goto err;
	112
b0e380b1	113	skb->transport_header = skb->network_header + sizeof(*hdr);
951dbc8a PM	114	IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
951dbc8a PM	115
1da177e4 LT	116	pkt_len = ntohs(hdr->payload_len);
	117
	118	/* pkt_len may be zero if Jumbo payload option is present */
	119	if (pkt_len \|\| hdr->nexthdr != NEXTHDR_HOP) {
60e5c166	120	if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
483a47d2 DL	121	IP6_INC_STATS_BH(net,
483a47d2 DL	122	idev, IPSTATS_MIB_INTRUNCATEDPKTS);
60e5c166 MC	123	goto drop;
60e5c166 MC	124	}
1da177e4	125	if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
483a47d2	126	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
1da177e4 LT	127	goto drop;
1da177e4 LT	128	}
0660e03f	129	hdr = ipv6_hdr(skb);
1da177e4 LT	130	}
	131
	132	if (hdr->nexthdr == NEXTHDR_HOP) {
e5bbef20	133	if (ipv6_parse_hopopts(skb) < 0) {
483a47d2	134	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
a11d206d	135	rcu_read_unlock();
1da177e4 LT	136	return 0;
1da177e4 LT	137	}
1da177e4 LT	138	}
1da177e4 LT	139
a11d206d YH	140	rcu_read_unlock();
a11d206d YH	141
6e23ae2a PM	142	return NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, dev, NULL,
6e23ae2a PM	143	ip6_rcv_finish);
1da177e4	144	err:
483a47d2	145	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
1da177e4	146	drop:
a11d206d	147	rcu_read_unlock();
1da177e4	148	kfree_skb(skb);
1da177e4 LT	149	return 0;
	150	}
	151
	152	/*
	153	* Deliver the packet to the host
	154	*/
	155
	156
ad643a79	157	static int ip6_input_finish(struct sk_buff *skb)
1da177e4 LT	158	{
1da177e4 LT	159	struct inet6_protocol *ipprot;
1da177e4	160	unsigned int nhoff;
69d6da0b	161	int nexthdr, raw;
1da177e4	162	u8 hash;
a11d206d	163	struct inet6_dev *idev;
483a47d2	164	struct net *net = dev_net(skb->dst->dev);
1da177e4	165
1da177e4 LT	166	/*
	167	* Parse extension headers
	168	*/
	169
1da177e4 LT	170	rcu_read_lock();
1da177e4 LT	171	resubmit:
a11d206d	172	idev = ip6_dst_idev(skb->dst);
ea2ae17d	173	if (!pskb_pull(skb, skb_transport_offset(skb)))
1da177e4	174	goto discard;
951dbc8a	175	nhoff = IP6CB(skb)->nhoff;
d56f90a7	176	nexthdr = skb_network_header(skb)[nhoff];
1da177e4	177
69d6da0b	178	raw = raw6_local_deliver(skb, nexthdr);
1da177e4 LT	179
	180	hash = nexthdr & (MAX_INET_PROTOS - 1);
	181	if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) {
	182	int ret;
1ab1457c	183
1da177e4	184	if (ipprot->flags & INET6_PROTO_FINAL) {
1ab1457c	185	struct ipv6hdr *hdr;
1da177e4	186
9fb9cbb1 YK	187	/* Free reference early: we don't need it any more,
	188	and it may hold ip_conntrack module loaded
	189	indefinitely. */
	190	nf_reset(skb);
	191
d56f90a7	192	skb_postpull_rcsum(skb, skb_network_header(skb),
cfe1fc77	193	skb_network_header_len(skb));
0660e03f	194	hdr = ipv6_hdr(skb);
1da177e4 LT	195	if (ipv6_addr_is_multicast(&hdr->daddr) &&
	196	!ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
	197	&hdr->saddr) &&
	198	!ipv6_is_mld(skb, nexthdr))
	199	goto discard;
	200	}
	201	if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
1ab1457c	202	!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1da177e4	203	goto discard;
1ab1457c	204
e5bbef20	205	ret = ipprot->handler(skb);
1da177e4 LT	206	if (ret > 0)
	207	goto resubmit;
	208	else if (ret == 0)
483a47d2	209	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
1da177e4	210	} else {
69d6da0b	211	if (!raw) {
1da177e4	212	if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
483a47d2 DL	213	IP6_INC_STATS_BH(net, idev,
483a47d2 DL	214	IPSTATS_MIB_INUNKNOWNPROTOS);
fad87aca	215	icmpv6_send(skb, ICMPV6_PARAMPROB,
1ab1457c YH	216	ICMPV6_UNK_NEXTHDR, nhoff,
1ab1457c YH	217	skb->dev);
1da177e4	218	}
fad87aca	219	} else
483a47d2	220	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
fad87aca	221	kfree_skb(skb);
1da177e4 LT	222	}
	223	rcu_read_unlock();
	224	return 0;
	225
	226	discard:
483a47d2	227	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
1da177e4 LT	228	rcu_read_unlock();
	229	kfree_skb(skb);
	230	return 0;
	231	}
	232
	233
	234	int ip6_input(struct sk_buff *skb)
	235	{
6e23ae2a PM	236	return NF_HOOK(PF_INET6, NF_INET_LOCAL_IN, skb, skb->dev, NULL,
6e23ae2a PM	237	ip6_input_finish);
1da177e4 LT	238	}
	239
	240	int ip6_mc_input(struct sk_buff *skb)
	241	{
	242	struct ipv6hdr *hdr;
	243	int deliver;
	244
edf391ff NH	245	IP6_UPD_PO_STATS_BH(dev_net(skb->dst->dev),
	246	ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCAST,
	247	skb->len);
1da177e4	248
0660e03f	249	hdr = ipv6_hdr(skb);
4c7966b8	250	deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
1da177e4	251
7bc570c8	252	#ifdef CONFIG_IPV6_MROUTE
1da177e4	253	/*
7bc570c8	254	* IPv6 multicast router mode is now supported ;)
1da177e4	255	*/
53b7997f	256	if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding &&
1d6e55f1	257	!(ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) &&
7bc570c8 YH	258	likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
	259	/*
	260	* Okay, we try to forward - split and duplicate
	261	* packets.
	262	*/
	263	struct sk_buff *skb2;
	264	struct inet6_skb_parm *opt = IP6CB(skb);
	265
	266	/* Check for MLD */
	267	if (unlikely(opt->ra)) {
	268	/* Check if this is a mld message */
	269	u8 *ptr = skb_network_header(skb) + opt->ra;
	270	struct icmp6hdr *icmp6;
	271	u8 nexthdr = hdr->nexthdr;
	272	int offset;
	273
	274	/* Check if the value of Router Alert
	275	* is for MLD (0x0000).
	276	*/
	277	if ((ptr[2] \| ptr[3]) == 0) {
aba6096b YH	278	deliver = 0;
aba6096b YH	279
7bc570c8 YH	280	if (!ipv6_ext_hdr(nexthdr)) {
7bc570c8 YH	281	/* BUG */
aba6096b	282	goto out;
7bc570c8 YH	283	}
	284	offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
	285	&nexthdr);
	286	if (offset < 0)
aba6096b	287	goto out;
7bc570c8 YH	288
7bc570c8 YH	289	if (nexthdr != IPPROTO_ICMPV6)
aba6096b	290	goto out;
7bc570c8 YH	291
	292	if (!pskb_may_pull(skb, (skb_network_header(skb) +
	293	offset + 1 - skb->data)))
aba6096b	294	goto out;
7bc570c8 YH	295
	296	icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
	297
	298	switch (icmp6->icmp6_type) {
	299	case ICMPV6_MGM_QUERY:
	300	case ICMPV6_MGM_REPORT:
	301	case ICMPV6_MGM_REDUCTION:
	302	case ICMPV6_MLD2_REPORT:
aba6096b	303	deliver = 1;
7bc570c8	304	break;
7bc570c8	305	}
7bc570c8 YH	306	goto out;
	307	}
	308	/* unknown RA - process it normally */
	309	}
1da177e4	310
7bc570c8 YH	311	if (deliver)
	312	skb2 = skb_clone(skb, GFP_ATOMIC);
	313	else {
	314	skb2 = skb;
	315	skb = NULL;
	316	}
1ab1457c	317
7bc570c8	318	if (skb2) {
7bc570c8	319	ip6_mr_input(skb2);
1da177e4 LT	320	}
1da177e4 LT	321	}
7bc570c8	322	out:
aba6096b YH	323	#endif
aba6096b YH	324	if (likely(deliver))
1da177e4	325	ip6_input(skb);
aba6096b YH	326	else {
	327	/* discard */
	328	kfree_skb(skb);
1da177e4	329	}
1da177e4 LT	330
	331	return 0;
	332	}