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 | * |
| 9 | * $Id: ip6_input.c,v 1.19 2000/12/13 18:31:50 davem Exp $ |
| 10 | * |
| 11 | * Based in linux/net/ipv4/ip_input.c |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License |
| 15 | * as published by the Free Software Foundation; either version |
| 16 | * 2 of the License, or (at your option) any later version. |
| 17 | */ |
| 18 | /* Changes |
| 19 | * |
| 20 | * Mitsuru KANDA @USAGI and |
| 21 | * YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs(). |
| 22 | */ |
| 23 | |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/socket.h> |
| 27 | #include <linux/sockios.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/net.h> |
| 29 | #include <linux/netdevice.h> |
| 30 | #include <linux/in6.h> |
| 31 | #include <linux/icmpv6.h> |
| 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 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 50 | inline int ip6_rcv_finish( struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
| 52 | if (skb->dst == NULL) |
| 53 | ip6_route_input(skb); |
| 54 | |
| 55 | return dst_input(skb); |
| 56 | } |
| 57 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 58 | 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] | 59 | { |
| 60 | struct ipv6hdr *hdr; |
| 61 | u32 pkt_len; |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 62 | struct inet6_dev *idev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Eric W. Biederman | e730c15 | 2007-09-17 11:53:39 -0700 | [diff] [blame] | 64 | if (dev->nd_net != &init_net) { |
| 65 | kfree_skb(skb); |
| 66 | return 0; |
| 67 | } |
| 68 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 69 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 70 | kfree_skb(skb); |
| 71 | return 0; |
| 72 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 74 | rcu_read_lock(); |
| 75 | |
| 76 | idev = __in6_dev_get(skb->dev); |
| 77 | |
| 78 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INRECEIVES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 81 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS); |
| 82 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | goto out; |
| 84 | } |
| 85 | |
Guillaume Chazarain | 6b7fdc3 | 2006-07-24 23:44:44 -0700 | [diff] [blame] | 86 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | /* |
| 89 | * Store incoming device index. When the packet will |
| 90 | * be queued, we cannot refer to skb->dev anymore. |
| 91 | * |
| 92 | * BTW, when we send a packet for our own local address on a |
| 93 | * non-loopback interface (e.g. ethX), it is being delivered |
Daniel Lezcano | de3cb74 | 2007-09-25 19:16:28 -0700 | [diff] [blame] | 94 | * via the loopback interface (lo) here; skb->dev = loopback_dev. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | * It, however, should be considered as if it is being |
| 96 | * arrived via the sending interface (ethX), because of the |
| 97 | * nature of scoping architecture. --yoshfuji |
| 98 | */ |
YOSHIFUJI Hideaki | 7a3025b | 2006-10-13 16:17:25 +0900 | [diff] [blame] | 99 | 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] | 100 | |
Herbert Xu | 2889139 | 2006-06-30 13:35:46 -0700 | [diff] [blame] | 101 | if (unlikely(!pskb_may_pull(skb, sizeof(*hdr)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | goto err; |
| 103 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 104 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
| 106 | if (hdr->version != 6) |
| 107 | goto err; |
| 108 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 109 | skb->transport_header = skb->network_header + sizeof(*hdr); |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 110 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
| 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | pkt_len = ntohs(hdr->payload_len); |
| 113 | |
| 114 | /* pkt_len may be zero if Jumbo payload option is present */ |
| 115 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { |
Mitsuru Chinen | 60e5c16 | 2007-04-04 23:54:59 -0700 | [diff] [blame] | 116 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) { |
| 117 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INTRUNCATEDPKTS); |
| 118 | goto drop; |
| 119 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 121 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | goto drop; |
| 123 | } |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 124 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | } |
| 126 | |
| 127 | if (hdr->nexthdr == NEXTHDR_HOP) { |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 128 | if (ipv6_parse_hopopts(skb) < 0) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 129 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
| 130 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | return 0; |
| 132 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } |
| 134 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 135 | rcu_read_unlock(); |
| 136 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 137 | return NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, dev, NULL, |
| 138 | ip6_rcv_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | err: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 140 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | drop: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 142 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | kfree_skb(skb); |
| 144 | out: |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * Deliver the packet to the host |
| 150 | */ |
| 151 | |
| 152 | |
Patrick McHardy | ad643a7 | 2007-10-15 01:51:38 -0700 | [diff] [blame] | 153 | static int ip6_input_finish(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
| 155 | struct inet6_protocol *ipprot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | unsigned int nhoff; |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 157 | int nexthdr, raw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | u8 hash; |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 159 | struct inet6_dev *idev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | /* |
| 162 | * Parse extension headers |
| 163 | */ |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | rcu_read_lock(); |
| 166 | resubmit: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 167 | idev = ip6_dst_idev(skb->dst); |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 168 | if (!pskb_pull(skb, skb_transport_offset(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | goto discard; |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 170 | nhoff = IP6CB(skb)->nhoff; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 171 | nexthdr = skb_network_header(skb)[nhoff]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 173 | raw = raw6_local_deliver(skb, nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
| 175 | hash = nexthdr & (MAX_INET_PROTOS - 1); |
| 176 | if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) { |
| 177 | int ret; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | if (ipprot->flags & INET6_PROTO_FINAL) { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 180 | struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 182 | /* Free reference early: we don't need it any more, |
| 183 | and it may hold ip_conntrack module loaded |
| 184 | indefinitely. */ |
| 185 | nf_reset(skb); |
| 186 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 187 | skb_postpull_rcsum(skb, skb_network_header(skb), |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 188 | skb_network_header_len(skb)); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 189 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | if (ipv6_addr_is_multicast(&hdr->daddr) && |
| 191 | !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, |
| 192 | &hdr->saddr) && |
| 193 | !ipv6_is_mld(skb, nexthdr)) |
| 194 | goto discard; |
| 195 | } |
| 196 | if (!(ipprot->flags & INET6_PROTO_NOPOLICY) && |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 197 | !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | goto discard; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 199 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 200 | ret = ipprot->handler(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | if (ret > 0) |
| 202 | goto resubmit; |
| 203 | else if (ret == 0) |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 204 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } else { |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 206 | if (!raw) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 208 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INUNKNOWNPROTOS); |
Patrick McHardy | fad87ac | 2005-08-16 21:03:41 -0700 | [diff] [blame] | 209 | icmpv6_send(skb, ICMPV6_PARAMPROB, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 210 | ICMPV6_UNK_NEXTHDR, nhoff, |
| 211 | skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
Patrick McHardy | fad87ac | 2005-08-16 21:03:41 -0700 | [diff] [blame] | 213 | } else |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 214 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS); |
Patrick McHardy | fad87ac | 2005-08-16 21:03:41 -0700 | [diff] [blame] | 215 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | } |
| 217 | rcu_read_unlock(); |
| 218 | return 0; |
| 219 | |
| 220 | discard: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 221 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | rcu_read_unlock(); |
| 223 | kfree_skb(skb); |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | |
| 228 | int ip6_input(struct sk_buff *skb) |
| 229 | { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 230 | return NF_HOOK(PF_INET6, NF_INET_LOCAL_IN, skb, skb->dev, NULL, |
| 231 | ip6_input_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | int ip6_mc_input(struct sk_buff *skb) |
| 235 | { |
| 236 | struct ipv6hdr *hdr; |
| 237 | int deliver; |
| 238 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 239 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCASTPKTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 241 | hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 4c7966b | 2008-03-31 19:30:45 -0700 | [diff] [blame] | 242 | deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
| 244 | /* |
| 245 | * IPv6 multicast router mode isnt currently supported. |
| 246 | */ |
| 247 | #if 0 |
| 248 | if (ipv6_config.multicast_route) { |
| 249 | int addr_type; |
| 250 | |
| 251 | addr_type = ipv6_addr_type(&hdr->daddr); |
| 252 | |
| 253 | if (!(addr_type & (IPV6_ADDR_LOOPBACK | IPV6_ADDR_LINKLOCAL))) { |
| 254 | struct sk_buff *skb2; |
| 255 | struct dst_entry *dst; |
| 256 | |
| 257 | dst = skb->dst; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | if (deliver) { |
| 260 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 261 | dst_output(skb2); |
| 262 | } else { |
| 263 | dst_output(skb); |
| 264 | return 0; |
| 265 | } |
| 266 | } |
| 267 | } |
| 268 | #endif |
| 269 | |
| 270 | if (likely(deliver)) { |
| 271 | ip6_input(skb); |
| 272 | return 0; |
| 273 | } |
| 274 | /* discard */ |
| 275 | kfree_skb(skb); |
| 276 | |
| 277 | return 0; |
| 278 | } |