[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/slab.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(skb) == 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 NET_RX_DROP;
	}

	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(skb) ? ip6_dst_idev(skb_dst(skb))->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 NET_RX_DROP;
		}
	}

	rcu_read_unlock();

	/* Must drop socket now because of tproxy. */
	skb_orphan(skb);

	return NF_HOOK(NFPROTO_IPV6, 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 NET_RX_DROP;
}

/*
 *	Deliver the packet to the host
 */


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

	/*
	 *	Parse extension headers
	 */

	rcu_read_lock();
resubmit:
	idev = ip6_dst_idev(skb_dst(skb));
	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);
			}
		} 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(NFPROTO_IPV6, 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(skb)->dev),
			 ip6_dst_idev(skb_dst(skb)), 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>
5a0e3ad6	31	#include <linux/slab.h>
1da177e4 LT	32
	33	#include <linux/netfilter.h>
	34	#include <linux/netfilter_ipv6.h>
	35
	36	#include <net/sock.h>
	37	#include <net/snmp.h>
	38
	39	#include <net/ipv6.h>
	40	#include <net/protocol.h>
	41	#include <net/transp_v6.h>
	42	#include <net/rawv6.h>
	43	#include <net/ndisc.h>
	44	#include <net/ip6_route.h>
	45	#include <net/addrconf.h>
	46	#include <net/xfrm.h>
	47
	48
	49
1ab1457c	50	inline int ip6_rcv_finish( struct sk_buff *skb)
1da177e4	51	{
adf30907	52	if (skb_dst(skb) == NULL)
1da177e4 LT	53	ip6_route_input(skb);
	54
	55	return dst_input(skb);
	56	}
	57
f2ccd8fa	58	int ipv6_rcv(struct sk_buff skb, struct net_device dev, struct packet_type pt, struct net_device orig_dev)
1da177e4 LT	59	{
	60	struct ipv6hdr *hdr;
	61	u32 pkt_len;
a11d206d	62	struct inet6_dev *idev;
483a47d2	63	struct net *net = dev_net(skb->dev);
1da177e4	64
a11d206d YH	65	if (skb->pkt_type == PACKET_OTHERHOST) {
a11d206d YH	66	kfree_skb(skb);
5c91face	67	return NET_RX_DROP;
a11d206d YH	68	}
	69
	70	rcu_read_lock();
1da177e4	71
a11d206d YH	72	idev = __in6_dev_get(skb->dev);
a11d206d YH	73
edf391ff	74	IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_IN, skb->len);
1da177e4	75
778d80be YH	76	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL \|\|
778d80be YH	77	!idev \|\| unlikely(idev->cnf.disable_ipv6)) {
483a47d2	78	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
71f6f6df	79	goto drop;
1da177e4 LT	80	}
1da177e4 LT	81
6b7fdc3a GC	82	memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
6b7fdc3a GC	83
1da177e4 LT	84	/*
	85	* Store incoming device index. When the packet will
	86	* be queued, we cannot refer to skb->dev anymore.
	87	*
	88	* BTW, when we send a packet for our own local address on a
	89	* non-loopback interface (e.g. ethX), it is being delivered
de3cb747	90	* via the loopback interface (lo) here; skb->dev = loopback_dev.
1da177e4 LT	91	* It, however, should be considered as if it is being
	92	* arrived via the sending interface (ethX), because of the
	93	* nature of scoping architecture. --yoshfuji
	94	*/
adf30907	95	IP6CB(skb)->iif = skb_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex;
1da177e4	96
2889139a	97	if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
1da177e4 LT	98	goto err;
1da177e4 LT	99
0660e03f	100	hdr = ipv6_hdr(skb);
1da177e4 LT	101
	102	if (hdr->version != 6)
	103	goto err;
	104
f630e43a YH	105	/*
	106	* RFC4291 2.5.3
	107	* A packet received on an interface with a destination address
	108	* of loopback must be dropped.
	109	*/
	110	if (!(dev->flags & IFF_LOOPBACK) &&
	111	ipv6_addr_loopback(&hdr->daddr))
	112	goto err;
	113
b0e380b1	114	skb->transport_header = skb->network_header + sizeof(*hdr);
951dbc8a PM	115	IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
951dbc8a PM	116
1da177e4 LT	117	pkt_len = ntohs(hdr->payload_len);
	118
	119	/* pkt_len may be zero if Jumbo payload option is present */
	120	if (pkt_len \|\| hdr->nexthdr != NEXTHDR_HOP) {
60e5c166	121	if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
483a47d2 DL	122	IP6_INC_STATS_BH(net,
483a47d2 DL	123	idev, IPSTATS_MIB_INTRUNCATEDPKTS);
60e5c166 MC	124	goto drop;
60e5c166 MC	125	}
1da177e4	126	if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
483a47d2	127	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
1da177e4 LT	128	goto drop;
1da177e4 LT	129	}
0660e03f	130	hdr = ipv6_hdr(skb);
1da177e4 LT	131	}
	132
	133	if (hdr->nexthdr == NEXTHDR_HOP) {
e5bbef20	134	if (ipv6_parse_hopopts(skb) < 0) {
483a47d2	135	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
a11d206d	136	rcu_read_unlock();
5c91face	137	return NET_RX_DROP;
1da177e4	138	}
1da177e4 LT	139	}
1da177e4 LT	140
a11d206d YH	141	rcu_read_unlock();
a11d206d YH	142
71f9dacd HX	143	/* Must drop socket now because of tproxy. */
	144	skb_orphan(skb);
	145
b2e0b385	146	return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, dev, NULL,
6e23ae2a	147	ip6_rcv_finish);
1da177e4	148	err:
483a47d2	149	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
1da177e4	150	drop:
a11d206d	151	rcu_read_unlock();
1da177e4	152	kfree_skb(skb);
5c91face	153	return NET_RX_DROP;
1da177e4 LT	154	}
	155
	156	/*
	157	* Deliver the packet to the host
	158	*/
	159
	160
ad643a79	161	static int ip6_input_finish(struct sk_buff *skb)
1da177e4	162	{
41135cc8	163	const struct inet6_protocol *ipprot;
1da177e4	164	unsigned int nhoff;
69d6da0b	165	int nexthdr, raw;
1da177e4	166	u8 hash;
a11d206d	167	struct inet6_dev *idev;
adf30907	168	struct net *net = dev_net(skb_dst(skb)->dev);
1da177e4	169
1da177e4 LT	170	/*
	171	* Parse extension headers
	172	*/
	173
1da177e4 LT	174	rcu_read_lock();
1da177e4 LT	175	resubmit:
adf30907	176	idev = ip6_dst_idev(skb_dst(skb));
ea2ae17d	177	if (!pskb_pull(skb, skb_transport_offset(skb)))
1da177e4	178	goto discard;
951dbc8a	179	nhoff = IP6CB(skb)->nhoff;
d56f90a7	180	nexthdr = skb_network_header(skb)[nhoff];
1da177e4	181
69d6da0b	182	raw = raw6_local_deliver(skb, nexthdr);
1da177e4 LT	183
	184	hash = nexthdr & (MAX_INET_PROTOS - 1);
	185	if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) {
	186	int ret;
1ab1457c	187
1da177e4	188	if (ipprot->flags & INET6_PROTO_FINAL) {
1ab1457c	189	struct ipv6hdr *hdr;
1da177e4	190
9fb9cbb1 YK	191	/* Free reference early: we don't need it any more,
	192	and it may hold ip_conntrack module loaded
	193	indefinitely. */
	194	nf_reset(skb);
	195
d56f90a7	196	skb_postpull_rcsum(skb, skb_network_header(skb),
cfe1fc77	197	skb_network_header_len(skb));
0660e03f	198	hdr = ipv6_hdr(skb);
1da177e4 LT	199	if (ipv6_addr_is_multicast(&hdr->daddr) &&
	200	!ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
	201	&hdr->saddr) &&
	202	!ipv6_is_mld(skb, nexthdr))
	203	goto discard;
	204	}
	205	if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
1ab1457c	206	!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1da177e4	207	goto discard;
1ab1457c	208
e5bbef20	209	ret = ipprot->handler(skb);
1da177e4 LT	210	if (ret > 0)
	211	goto resubmit;
	212	else if (ret == 0)
483a47d2	213	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
1da177e4	214	} else {
69d6da0b	215	if (!raw) {
1da177e4	216	if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
483a47d2 DL	217	IP6_INC_STATS_BH(net, idev,
483a47d2 DL	218	IPSTATS_MIB_INUNKNOWNPROTOS);
fad87aca	219	icmpv6_send(skb, ICMPV6_PARAMPROB,
3ffe533c	220	ICMPV6_UNK_NEXTHDR, nhoff);
1da177e4	221	}
fad87aca	222	} else
483a47d2	223	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
fad87aca	224	kfree_skb(skb);
1da177e4 LT	225	}
	226	rcu_read_unlock();
	227	return 0;
	228
	229	discard:
483a47d2	230	IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
1da177e4 LT	231	rcu_read_unlock();
	232	kfree_skb(skb);
	233	return 0;
	234	}
	235
	236
	237	int ip6_input(struct sk_buff *skb)
	238	{
b2e0b385	239	return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN, skb, skb->dev, NULL,
6e23ae2a	240	ip6_input_finish);
1da177e4 LT	241	}
	242
	243	int ip6_mc_input(struct sk_buff *skb)
	244	{
	245	struct ipv6hdr *hdr;
	246	int deliver;
	247
adf30907 ED	248	IP6_UPD_PO_STATS_BH(dev_net(skb_dst(skb)->dev),
adf30907 ED	249	ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INMCAST,
edf391ff	250	skb->len);
1da177e4	251
0660e03f	252	hdr = ipv6_hdr(skb);
4c7966b8	253	deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
1da177e4	254
7bc570c8	255	#ifdef CONFIG_IPV6_MROUTE
1da177e4	256	/*
7bc570c8	257	* IPv6 multicast router mode is now supported ;)
1da177e4	258	*/
53b7997f	259	if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding &&
1d6e55f1	260	!(ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) &&
7bc570c8 YH	261	likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
	262	/*
	263	* Okay, we try to forward - split and duplicate
	264	* packets.
	265	*/
	266	struct sk_buff *skb2;
	267	struct inet6_skb_parm *opt = IP6CB(skb);
	268
	269	/* Check for MLD */
	270	if (unlikely(opt->ra)) {
	271	/* Check if this is a mld message */
	272	u8 *ptr = skb_network_header(skb) + opt->ra;
	273	struct icmp6hdr *icmp6;
	274	u8 nexthdr = hdr->nexthdr;
	275	int offset;
	276
	277	/* Check if the value of Router Alert
	278	* is for MLD (0x0000).
	279	*/
	280	if ((ptr[2] \| ptr[3]) == 0) {
aba6096b YH	281	deliver = 0;
aba6096b YH	282
7bc570c8 YH	283	if (!ipv6_ext_hdr(nexthdr)) {
7bc570c8 YH	284	/* BUG */
aba6096b	285	goto out;
7bc570c8 YH	286	}
	287	offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
	288	&nexthdr);
	289	if (offset < 0)
aba6096b	290	goto out;
7bc570c8 YH	291
7bc570c8 YH	292	if (nexthdr != IPPROTO_ICMPV6)
aba6096b	293	goto out;
7bc570c8 YH	294
	295	if (!pskb_may_pull(skb, (skb_network_header(skb) +
	296	offset + 1 - skb->data)))
aba6096b	297	goto out;
7bc570c8 YH	298
	299	icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
	300
	301	switch (icmp6->icmp6_type) {
	302	case ICMPV6_MGM_QUERY:
	303	case ICMPV6_MGM_REPORT:
	304	case ICMPV6_MGM_REDUCTION:
	305	case ICMPV6_MLD2_REPORT:
aba6096b	306	deliver = 1;
7bc570c8	307	break;
7bc570c8	308	}
7bc570c8 YH	309	goto out;
	310	}
	311	/* unknown RA - process it normally */
	312	}
1da177e4	313
7bc570c8 YH	314	if (deliver)
	315	skb2 = skb_clone(skb, GFP_ATOMIC);
	316	else {
	317	skb2 = skb;
	318	skb = NULL;
	319	}
1ab1457c	320
7bc570c8	321	if (skb2) {
7bc570c8	322	ip6_mr_input(skb2);
1da177e4 LT	323	}
1da177e4 LT	324	}
7bc570c8	325	out:
aba6096b YH	326	#endif
aba6096b YH	327	if (likely(deliver))
1da177e4	328	ip6_input(skb);
aba6096b YH	329	else {
	330	/* discard */
	331	kfree_skb(skb);
1da177e4	332	}
1da177e4 LT	333
	334	return 0;
	335	}