Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IPv6 input |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 3 | * Linux INET6 implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Authors: |
| 6 | * Pedro Roque <roque@di.fc.ul.pt> |
| 7 | * Ian P. Morris <I.P.Morris@soton.ac.uk> |
| 8 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/net.h> |
| 27 | #include <linux/netdevice.h> |
| 28 | #include <linux/in6.h> |
| 29 | #include <linux/icmpv6.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 30 | #include <linux/mroute6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 49 | inline int ip6_rcv_finish( struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
| 51 | if (skb->dst == NULL) |
| 52 | ip6_route_input(skb); |
| 53 | |
| 54 | return dst_input(skb); |
| 55 | } |
| 56 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 57 | int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | { |
| 59 | struct ipv6hdr *hdr; |
| 60 | u32 pkt_len; |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 61 | struct inet6_dev *idev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 63 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 64 | kfree_skb(skb); |
| 65 | return 0; |
| 66 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 68 | rcu_read_lock(); |
| 69 | |
| 70 | idev = __in6_dev_get(skb->dev); |
| 71 | |
| 72 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INRECEIVES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
YOSHIFUJI Hideaki | 778d80b | 2008-06-28 14:17:11 +0900 | [diff] [blame] | 74 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL || |
| 75 | !idev || unlikely(idev->cnf.disable_ipv6)) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 76 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS); |
| 77 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | goto out; |
| 79 | } |
| 80 | |
Guillaume Chazarain | 6b7fdc3 | 2006-07-24 23:44:44 -0700 | [diff] [blame] | 81 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
| 82 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Daniel Lezcano | de3cb74 | 2007-09-25 19:16:28 -0700 | [diff] [blame] | 89 | * via the loopback interface (lo) here; skb->dev = loopback_dev. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
YOSHIFUJI Hideaki | 7a3025b | 2006-10-13 16:17:25 +0900 | [diff] [blame] | 94 | IP6CB(skb)->iif = skb->dst ? ip6_dst_idev(skb->dst)->dev->ifindex : dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Herbert Xu | 2889139 | 2006-06-30 13:35:46 -0700 | [diff] [blame] | 96 | if (unlikely(!pskb_may_pull(skb, sizeof(*hdr)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | goto err; |
| 98 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 99 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
| 101 | if (hdr->version != 6) |
| 102 | goto err; |
| 103 | |
YOSHIFUJI Hideaki | f630e43 | 2008-06-19 16:33:57 -0700 | [diff] [blame] | 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 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 113 | skb->transport_header = skb->network_header + sizeof(*hdr); |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 114 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
| 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Mitsuru Chinen | 60e5c16 | 2007-04-04 23:54:59 -0700 | [diff] [blame] | 120 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) { |
| 121 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INTRUNCATEDPKTS); |
| 122 | goto drop; |
| 123 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 125 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | goto drop; |
| 127 | } |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 128 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | } |
| 130 | |
| 131 | if (hdr->nexthdr == NEXTHDR_HOP) { |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 132 | if (ipv6_parse_hopopts(skb) < 0) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 133 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
| 134 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | return 0; |
| 136 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } |
| 138 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 139 | rcu_read_unlock(); |
| 140 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 141 | return NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, dev, NULL, |
| 142 | ip6_rcv_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | err: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 144 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | drop: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 146 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | kfree_skb(skb); |
| 148 | out: |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | /* |
| 153 | * Deliver the packet to the host |
| 154 | */ |
| 155 | |
| 156 | |
Patrick McHardy | ad643a7 | 2007-10-15 01:51:38 -0700 | [diff] [blame] | 157 | static int ip6_input_finish(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | { |
| 159 | struct inet6_protocol *ipprot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | unsigned int nhoff; |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 161 | int nexthdr, raw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | u8 hash; |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 163 | struct inet6_dev *idev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | /* |
| 166 | * Parse extension headers |
| 167 | */ |
| 168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | rcu_read_lock(); |
| 170 | resubmit: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 171 | idev = ip6_dst_idev(skb->dst); |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 172 | if (!pskb_pull(skb, skb_transport_offset(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | goto discard; |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 174 | nhoff = IP6CB(skb)->nhoff; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 175 | nexthdr = skb_network_header(skb)[nhoff]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 177 | raw = raw6_local_deliver(skb, nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
| 179 | hash = nexthdr & (MAX_INET_PROTOS - 1); |
| 180 | if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) { |
| 181 | int ret; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | if (ipprot->flags & INET6_PROTO_FINAL) { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 184 | struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 186 | /* Free reference early: we don't need it any more, |
| 187 | and it may hold ip_conntrack module loaded |
| 188 | indefinitely. */ |
| 189 | nf_reset(skb); |
| 190 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 191 | skb_postpull_rcsum(skb, skb_network_header(skb), |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 192 | skb_network_header_len(skb)); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 193 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | if (ipv6_addr_is_multicast(&hdr->daddr) && |
| 195 | !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, |
| 196 | &hdr->saddr) && |
| 197 | !ipv6_is_mld(skb, nexthdr)) |
| 198 | goto discard; |
| 199 | } |
| 200 | if (!(ipprot->flags & INET6_PROTO_NOPOLICY) && |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 201 | !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | goto discard; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 203 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 204 | ret = ipprot->handler(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | if (ret > 0) |
| 206 | goto resubmit; |
| 207 | else if (ret == 0) |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 208 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | } else { |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 210 | if (!raw) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 212 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INUNKNOWNPROTOS); |
Patrick McHardy | fad87ac | 2005-08-16 21:03:41 -0700 | [diff] [blame] | 213 | icmpv6_send(skb, ICMPV6_PARAMPROB, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 214 | ICMPV6_UNK_NEXTHDR, nhoff, |
| 215 | skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | } |
Patrick McHardy | fad87ac | 2005-08-16 21:03:41 -0700 | [diff] [blame] | 217 | } else |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 218 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS); |
Patrick McHardy | fad87ac | 2005-08-16 21:03:41 -0700 | [diff] [blame] | 219 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | } |
| 221 | rcu_read_unlock(); |
| 222 | return 0; |
| 223 | |
| 224 | discard: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 225 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | rcu_read_unlock(); |
| 227 | kfree_skb(skb); |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | |
| 232 | int ip6_input(struct sk_buff *skb) |
| 233 | { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 234 | return NF_HOOK(PF_INET6, NF_INET_LOCAL_IN, skb, skb->dev, NULL, |
| 235 | ip6_input_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | int ip6_mc_input(struct sk_buff *skb) |
| 239 | { |
| 240 | struct ipv6hdr *hdr; |
| 241 | int deliver; |
| 242 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 243 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCASTPKTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 245 | hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 4c7966b | 2008-03-31 19:30:45 -0700 | [diff] [blame] | 246 | deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 248 | #ifdef CONFIG_IPV6_MROUTE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | /* |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 250 | * IPv6 multicast router mode is now supported ;) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | */ |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 252 | if (ipv6_devconf.mc_forwarding && |
| 253 | likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) { |
| 254 | /* |
| 255 | * Okay, we try to forward - split and duplicate |
| 256 | * packets. |
| 257 | */ |
| 258 | struct sk_buff *skb2; |
| 259 | struct inet6_skb_parm *opt = IP6CB(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 261 | /* Check for MLD */ |
| 262 | if (unlikely(opt->ra)) { |
| 263 | /* Check if this is a mld message */ |
| 264 | u8 *ptr = skb_network_header(skb) + opt->ra; |
| 265 | struct icmp6hdr *icmp6; |
| 266 | u8 nexthdr = hdr->nexthdr; |
| 267 | int offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 269 | /* Check if the value of Router Alert |
| 270 | * is for MLD (0x0000). |
| 271 | */ |
| 272 | if ((ptr[2] | ptr[3]) == 0) { |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 273 | deliver = 0; |
| 274 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 275 | if (!ipv6_ext_hdr(nexthdr)) { |
| 276 | /* BUG */ |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 277 | goto out; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 278 | } |
| 279 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), |
| 280 | &nexthdr); |
| 281 | if (offset < 0) |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 282 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 284 | if (nexthdr != IPPROTO_ICMPV6) |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 285 | goto out; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 286 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 287 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
| 288 | offset + 1 - skb->data))) |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 289 | goto out; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 290 | |
| 291 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
| 292 | |
| 293 | switch (icmp6->icmp6_type) { |
| 294 | case ICMPV6_MGM_QUERY: |
| 295 | case ICMPV6_MGM_REPORT: |
| 296 | case ICMPV6_MGM_REDUCTION: |
| 297 | case ICMPV6_MLD2_REPORT: |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 298 | deliver = 1; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 299 | break; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 300 | } |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 301 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | } |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 303 | /* unknown RA - process it normally */ |
| 304 | } |
| 305 | |
| 306 | if (deliver) |
| 307 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 308 | else { |
| 309 | skb2 = skb; |
| 310 | skb = NULL; |
| 311 | } |
| 312 | |
| 313 | if (skb2) { |
| 314 | skb2->dev = skb2->dst->dev; |
| 315 | ip6_mr_input(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | } |
| 317 | } |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 318 | out: |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 319 | #endif |
| 320 | if (likely(deliver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | ip6_input(skb); |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 322 | else { |
| 323 | /* discard */ |
| 324 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | return 0; |
| 328 | } |