blob: 9075acf081dda32e30185886714f34f61b0b1f7d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IPv6 input
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Ian P. Morris <I.P.Morris@soton.ac.uk>
8 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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 *
Ian Morris67ba4152014-08-24 21:53:10 +010018 * Mitsuru KANDA @USAGI and
19 * YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs().
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 */
21
22#include <linux/errno.h>
23#include <linux/types.h>
24#include <linux/socket.h>
25#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/net.h>
27#include <linux/netdevice.h>
28#include <linux/in6.h>
29#include <linux/icmpv6.h>
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +090030#include <linux/mroute6.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
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>
Eric Dumazet1f07d032013-08-06 03:32:11 -070047#include <net/inet_ecn.h>
Wei-Chun Chao48fb6b52015-07-22 18:13:12 -070048#include <net/dst_metadata.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Eric W. Biederman0c4b51f2015-09-15 20:04:18 -050050int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051{
Holger Eitzenbergera452ce32014-01-27 10:33:18 +010052 if (sysctl_ip_early_demux && !skb_dst(skb) && skb->sk == NULL) {
Eric Dumazetc7109982012-07-26 12:18:11 +000053 const struct inet6_protocol *ipprot;
54
Eric Dumazetc7109982012-07-26 12:18:11 +000055 ipprot = rcu_dereference(inet6_protos[ipv6_hdr(skb)->nexthdr]);
56 if (ipprot && ipprot->early_demux)
57 ipprot->early_demux(skb);
Eric Dumazetc7109982012-07-26 12:18:11 +000058 }
Wei-Chun Chao48fb6b52015-07-22 18:13:12 -070059 if (!skb_valid_dst(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 ip6_route_input(skb);
61
62 return dst_input(skb);
63}
64
David S. Millerf2ccd8f2005-08-09 19:34:12 -070065int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066{
Eric Dumazetb71d1d42011-04-22 04:53:02 +000067 const struct ipv6hdr *hdr;
Ian Morris67ba4152014-08-24 21:53:10 +010068 u32 pkt_len;
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +090069 struct inet6_dev *idev;
Denis V. Lunev483a47d2008-10-08 11:09:27 -070070 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +090072 if (skb->pkt_type == PACKET_OTHERHOST) {
73 kfree_skb(skb);
Mark Smith5c91fac2009-07-06 11:26:24 +000074 return NET_RX_DROP;
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +090075 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +090077 rcu_read_lock();
78
79 idev = __in6_dev_get(skb->dev);
80
Neil Hormanedf391f2009-04-27 02:45:02 -070081 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_IN, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +090083 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
84 !idev || unlikely(idev->cnf.disable_ipv6)) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -070085 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
Jesper Nilsson71f6f6d2009-03-27 00:17:45 -070086 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 }
88
Guillaume Chazarain6b7fdc32006-07-24 23:44:44 -070089 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 /*
92 * Store incoming device index. When the packet will
93 * be queued, we cannot refer to skb->dev anymore.
94 *
95 * BTW, when we send a packet for our own local address on a
96 * non-loopback interface (e.g. ethX), it is being delivered
Daniel Lezcanode3cb742007-09-25 19:16:28 -070097 * via the loopback interface (lo) here; skb->dev = loopback_dev.
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 * It, however, should be considered as if it is being
99 * arrived via the sending interface (ethX), because of the
100 * nature of scoping architecture. --yoshfuji
101 */
Wei-Chun Chao48fb6b52015-07-22 18:13:12 -0700102 IP6CB(skb)->iif = skb_valid_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Herbert Xu28891392006-06-30 13:35:46 -0700104 if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 goto err;
106
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700107 hdr = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
109 if (hdr->version != 6)
110 goto err;
111
Eric W. Biederman98652492015-09-15 20:04:08 -0500112 IP6_ADD_STATS_BH(net, idev,
Eric Dumazet1f07d032013-08-06 03:32:11 -0700113 IPSTATS_MIB_NOECTPKTS +
114 (ipv6_get_dsfield(hdr) & INET_ECN_MASK),
115 max_t(unsigned short, 1, skb_shinfo(skb)->gso_segs));
YOSHIFUJI Hideakif630e432008-06-19 16:33:57 -0700116 /*
117 * RFC4291 2.5.3
118 * A packet received on an interface with a destination address
119 * of loopback must be dropped.
120 */
121 if (!(dev->flags & IFF_LOOPBACK) &&
122 ipv6_addr_loopback(&hdr->daddr))
123 goto err;
124
Hannes Frederic Sowa1c4a1542013-03-26 08:13:34 +0000125 /* RFC4291 Errata ID: 3480
126 * Interface-Local scope spans only a single interface on a
127 * node and is useful only for loopback transmission of
128 * multicast. Packets with interface-local scope received
129 * from another node must be discarded.
130 */
131 if (!(skb->pkt_type == PACKET_LOOPBACK ||
132 dev->flags & IFF_LOOPBACK) &&
133 ipv6_addr_is_multicast(&hdr->daddr) &&
134 IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 1)
135 goto err;
136
Hannes Frederic Sowa20314092013-02-10 05:35:22 +0000137 /* RFC4291 2.7
138 * Nodes must not originate a packet to a multicast address whose scope
139 * field contains the reserved value 0; if such a packet is received, it
140 * must be silently dropped.
141 */
142 if (ipv6_addr_is_multicast(&hdr->daddr) &&
143 IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 0)
144 goto err;
145
Brian Haleyc4573382011-11-08 04:41:42 +0000146 /*
147 * RFC4291 2.7
148 * Multicast addresses must not be used as source addresses in IPv6
149 * packets or appear in any Routing header.
150 */
151 if (ipv6_addr_is_multicast(&hdr->saddr))
152 goto err;
153
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700154 skb->transport_header = skb->network_header + sizeof(*hdr);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800155 IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 pkt_len = ntohs(hdr->payload_len);
158
159 /* pkt_len may be zero if Jumbo payload option is present */
160 if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
Mitsuru Chinen60e5c162007-04-04 23:54:59 -0700161 if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700162 IP6_INC_STATS_BH(net,
163 idev, IPSTATS_MIB_INTRUNCATEDPKTS);
Mitsuru Chinen60e5c162007-04-04 23:54:59 -0700164 goto drop;
165 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700167 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 goto drop;
169 }
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700170 hdr = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 }
172
173 if (hdr->nexthdr == NEXTHDR_HOP) {
Herbert Xue5bbef22007-10-15 12:50:28 -0700174 if (ipv6_parse_hopopts(skb) < 0) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700175 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900176 rcu_read_unlock();
Mark Smith5c91fac2009-07-06 11:26:24 +0000177 return NET_RX_DROP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900181 rcu_read_unlock();
182
Herbert Xu71f9dac2009-06-26 19:22:37 -0700183 /* Must drop socket now because of tproxy. */
184 skb_orphan(skb);
185
Eric W. Biederman29a26a52015-09-15 20:04:16 -0500186 return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
187 net, NULL, skb, dev, NULL,
Patrick McHardy6e23ae22007-11-19 18:53:30 -0800188 ip6_rcv_finish);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189err:
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700190 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191drop:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900192 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 kfree_skb(skb);
Mark Smith5c91fac2009-07-06 11:26:24 +0000194 return NET_RX_DROP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
197/*
198 * Deliver the packet to the host
199 */
200
201
Eric W. Biederman0c4b51f2015-09-15 20:04:18 -0500202static int ip6_input_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203{
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000204 const struct inet6_protocol *ipprot;
David S. Millerf9242b62012-06-19 18:56:21 -0700205 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 unsigned int nhoff;
Eric Dumazeta50feda2012-05-18 18:57:34 +0000207 int nexthdr;
208 bool raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 /*
211 * Parse extension headers
212 */
213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 rcu_read_lock();
David S. Miller1b0ccfe2015-06-10 15:29:31 -0700215resubmit:
Eric Dumazetadf30902009-06-02 05:19:30 +0000216 idev = ip6_dst_idev(skb_dst(skb));
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700217 if (!pskb_pull(skb, skb_transport_offset(skb)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 goto discard;
Patrick McHardy951dbc82006-01-06 23:02:34 -0800219 nhoff = IP6CB(skb)->nhoff;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700220 nexthdr = skb_network_header(skb)[nhoff];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Pavel Emelyanov69d6da02007-11-19 22:35:57 -0800222 raw = raw6_local_deliver(skb, nexthdr);
Ian Morrise5d08d72014-11-23 21:28:43 +0000223 ipprot = rcu_dereference(inet6_protos[nexthdr]);
Ian Morris53b24b82015-03-29 14:00:05 +0100224 if (ipprot) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 int ret;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 if (ipprot->flags & INET6_PROTO_FINAL) {
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000228 const struct ipv6hdr *hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800230 /* Free reference early: we don't need it any more,
231 and it may hold ip_conntrack module loaded
232 indefinitely. */
233 nf_reset(skb);
234
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700235 skb_postpull_rcsum(skb, skb_network_header(skb),
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300236 skb_network_header_len(skb));
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700237 hdr = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 if (ipv6_addr_is_multicast(&hdr->daddr) &&
239 !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
240 &hdr->saddr) &&
YOSHIFUJI Hideaki / 吉藤英明daad1512013-01-13 05:02:18 +0000241 !ipv6_is_mld(skb, nexthdr, skb_network_header_len(skb)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 goto discard;
243 }
244 if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900245 !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 goto discard;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900247
Herbert Xue5bbef22007-10-15 12:50:28 -0700248 ret = ipprot->handler(skb);
David S. Miller1b0ccfe2015-06-10 15:29:31 -0700249 if (ret > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 goto resubmit;
David S. Miller1b0ccfe2015-06-10 15:29:31 -0700251 else if (ret == 0)
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700252 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 } else {
Pavel Emelyanov69d6da02007-11-19 22:35:57 -0800254 if (!raw) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700256 IP6_INC_STATS_BH(net, idev,
257 IPSTATS_MIB_INUNKNOWNPROTOS);
Patrick McHardyfad87ac2005-08-16 21:03:41 -0700258 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000259 ICMPV6_UNK_NEXTHDR, nhoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 }
Neil Hormand8c6f4b2013-03-01 07:44:08 +0000261 kfree_skb(skb);
262 } else {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700263 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
Neil Hormand8c6f4b2013-03-01 07:44:08 +0000264 consume_skb(skb);
265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 }
267 rcu_read_unlock();
268 return 0;
269
270discard:
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700271 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 rcu_read_unlock();
273 kfree_skb(skb);
274 return 0;
275}
276
277
278int ip6_input(struct sk_buff *skb)
279{
Eric W. Biederman29a26a52015-09-15 20:04:16 -0500280 return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN,
281 dev_net(skb->dev), NULL, skb, skb->dev, NULL,
Patrick McHardy6e23ae22007-11-19 18:53:30 -0800282 ip6_input_finish);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285int ip6_mc_input(struct sk_buff *skb)
286{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000287 const struct ipv6hdr *hdr;
Eric Dumazeta50feda2012-05-18 18:57:34 +0000288 bool deliver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Eric Dumazetadf30902009-06-02 05:19:30 +0000290 IP6_UPD_PO_STATS_BH(dev_net(skb_dst(skb)->dev),
291 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INMCAST,
Neil Hormanedf391f2009-04-27 02:45:02 -0700292 skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700294 hdr = ipv6_hdr(skb);
YOSHIFUJI Hideaki4c7966b2008-03-31 19:30:45 -0700295 deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900297#ifdef CONFIG_IPV6_MROUTE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 /*
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900299 * IPv6 multicast router mode is now supported ;)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 */
YOSHIFUJI Hideaki53b79972008-07-19 22:35:03 -0700301 if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding &&
Hannes Frederic Sowaddf64352013-03-08 02:07:23 +0000302 !(ipv6_addr_type(&hdr->daddr) &
303 (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)) &&
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900304 likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
305 /*
306 * Okay, we try to forward - split and duplicate
307 * packets.
308 */
309 struct sk_buff *skb2;
310 struct inet6_skb_parm *opt = IP6CB(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900312 /* Check for MLD */
YOSHIFUJI Hideaki / 吉藤英明dd3332b2013-01-13 05:02:45 +0000313 if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900314 /* Check if this is a mld message */
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900315 u8 nexthdr = hdr->nexthdr;
Jesse Gross75f28112011-11-30 17:05:51 -0800316 __be16 frag_off;
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900317 int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900319 /* Check if the value of Router Alert
320 * is for MLD (0x0000).
321 */
YOSHIFUJI Hideaki / 吉藤英明dd3332b2013-01-13 05:02:45 +0000322 if (opt->ra == htons(IPV6_OPT_ROUTERALERT_MLD)) {
Eric Dumazeta50feda2012-05-18 18:57:34 +0000323 deliver = false;
YOSHIFUJI Hideakiaba60962008-04-10 15:41:26 +0900324
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900325 if (!ipv6_ext_hdr(nexthdr)) {
326 /* BUG */
YOSHIFUJI Hideakiaba60962008-04-10 15:41:26 +0900327 goto out;
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900328 }
329 offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
Jesse Gross75f28112011-11-30 17:05:51 -0800330 &nexthdr, &frag_off);
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900331 if (offset < 0)
YOSHIFUJI Hideakiaba60962008-04-10 15:41:26 +0900332 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Angga4c938d22015-07-03 14:40:52 +1200334 if (ipv6_is_mld(skb, nexthdr, offset))
335 deliver = true;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900336
Angga4c938d22015-07-03 14:40:52 +1200337 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 }
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900339 /* unknown RA - process it normally */
340 }
341
342 if (deliver)
343 skb2 = skb_clone(skb, GFP_ATOMIC);
344 else {
345 skb2 = skb;
346 skb = NULL;
347 }
348
349 if (skb2) {
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900350 ip6_mr_input(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
352 }
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900353out:
YOSHIFUJI Hideakiaba60962008-04-10 15:41:26 +0900354#endif
355 if (likely(deliver))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 ip6_input(skb);
YOSHIFUJI Hideakiaba60962008-04-10 15:41:26 +0900357 else {
358 /* discard */
359 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362 return 0;
363}