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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 31 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 50 | int ip6_rcv_finish(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 52 | if (sysctl_ip_early_demux && !skb_dst(skb)) { |
| 53 | const struct inet6_protocol *ipprot; |
| 54 | |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 55 | ipprot = rcu_dereference(inet6_protos[ipv6_hdr(skb)->nexthdr]); |
| 56 | if (ipprot && ipprot->early_demux) |
| 57 | ipprot->early_demux(skb); |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 58 | } |
| 59 | if (!skb_dst(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | ip6_route_input(skb); |
| 61 | |
| 62 | return dst_input(skb); |
| 63 | } |
| 64 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 65 | 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] | 66 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 67 | const struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | u32 pkt_len; |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 69 | struct inet6_dev *idev; |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 70 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 72 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 73 | kfree_skb(skb); |
Mark Smith | 5c91fac | 2009-07-06 11:26:24 +0000 | [diff] [blame] | 74 | return NET_RX_DROP; |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 75 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 77 | rcu_read_lock(); |
| 78 | |
| 79 | idev = __in6_dev_get(skb->dev); |
| 80 | |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 81 | IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_IN, skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
YOSHIFUJI Hideaki | 778d80b | 2008-06-28 14:17:11 +0900 | [diff] [blame] | 83 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL || |
| 84 | !idev || unlikely(idev->cnf.disable_ipv6)) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 85 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS); |
Jesper Nilsson | 71f6f6d | 2009-03-27 00:17:45 -0700 | [diff] [blame] | 86 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
| 88 | |
Guillaume Chazarain | 6b7fdc3 | 2006-07-24 23:44:44 -0700 | [diff] [blame] | 89 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | /* |
| 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 Lezcano | de3cb74 | 2007-09-25 19:16:28 -0700 | [diff] [blame] | 97 | * via the loopback interface (lo) here; skb->dev = loopback_dev. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | * 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 | */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 102 | IP6CB(skb)->iif = skb_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Herbert Xu | 2889139 | 2006-06-30 13:35:46 -0700 | [diff] [blame] | 104 | if (unlikely(!pskb_may_pull(skb, sizeof(*hdr)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | goto err; |
| 106 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 107 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
| 109 | if (hdr->version != 6) |
| 110 | goto err; |
| 111 | |
YOSHIFUJI Hideaki | f630e43 | 2008-06-19 16:33:57 -0700 | [diff] [blame] | 112 | /* |
| 113 | * RFC4291 2.5.3 |
| 114 | * A packet received on an interface with a destination address |
| 115 | * of loopback must be dropped. |
| 116 | */ |
| 117 | if (!(dev->flags & IFF_LOOPBACK) && |
| 118 | ipv6_addr_loopback(&hdr->daddr)) |
| 119 | goto err; |
| 120 | |
Brian Haley | c457338 | 2011-11-08 04:41:42 +0000 | [diff] [blame] | 121 | /* |
| 122 | * RFC4291 2.7 |
| 123 | * Multicast addresses must not be used as source addresses in IPv6 |
| 124 | * packets or appear in any Routing header. |
| 125 | */ |
| 126 | if (ipv6_addr_is_multicast(&hdr->saddr)) |
| 127 | goto err; |
| 128 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 129 | skb->transport_header = skb->network_header + sizeof(*hdr); |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 130 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
| 131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | pkt_len = ntohs(hdr->payload_len); |
| 133 | |
| 134 | /* pkt_len may be zero if Jumbo payload option is present */ |
| 135 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { |
Mitsuru Chinen | 60e5c16 | 2007-04-04 23:54:59 -0700 | [diff] [blame] | 136 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 137 | IP6_INC_STATS_BH(net, |
| 138 | idev, IPSTATS_MIB_INTRUNCATEDPKTS); |
Mitsuru Chinen | 60e5c16 | 2007-04-04 23:54:59 -0700 | [diff] [blame] | 139 | goto drop; |
| 140 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 142 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | goto drop; |
| 144 | } |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 145 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } |
| 147 | |
| 148 | if (hdr->nexthdr == NEXTHDR_HOP) { |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 149 | if (ipv6_parse_hopopts(skb) < 0) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 150 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 151 | rcu_read_unlock(); |
Mark Smith | 5c91fac | 2009-07-06 11:26:24 +0000 | [diff] [blame] | 152 | return NET_RX_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 156 | rcu_read_unlock(); |
| 157 | |
Herbert Xu | 71f9dac | 2009-06-26 19:22:37 -0700 | [diff] [blame] | 158 | /* Must drop socket now because of tproxy. */ |
| 159 | skb_orphan(skb); |
| 160 | |
Jan Engelhardt | b2e0b38 | 2010-03-23 04:09:07 +0100 | [diff] [blame] | 161 | return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, dev, NULL, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 162 | ip6_rcv_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | err: |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 164 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | drop: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 166 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | kfree_skb(skb); |
Mark Smith | 5c91fac | 2009-07-06 11:26:24 +0000 | [diff] [blame] | 168 | return NET_RX_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | /* |
| 172 | * Deliver the packet to the host |
| 173 | */ |
| 174 | |
| 175 | |
Patrick McHardy | ad643a7 | 2007-10-15 01:51:38 -0700 | [diff] [blame] | 176 | static int ip6_input_finish(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | { |
David S. Miller | f9242b6 | 2012-06-19 18:56:21 -0700 | [diff] [blame] | 178 | struct net *net = dev_net(skb_dst(skb)->dev); |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 179 | const struct inet6_protocol *ipprot; |
David S. Miller | f9242b6 | 2012-06-19 18:56:21 -0700 | [diff] [blame] | 180 | struct inet6_dev *idev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | unsigned int nhoff; |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 182 | int nexthdr; |
| 183 | bool raw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | /* |
| 186 | * Parse extension headers |
| 187 | */ |
| 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | rcu_read_lock(); |
| 190 | resubmit: |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 191 | idev = ip6_dst_idev(skb_dst(skb)); |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 192 | if (!pskb_pull(skb, skb_transport_offset(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | goto discard; |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 194 | nhoff = IP6CB(skb)->nhoff; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 195 | nexthdr = skb_network_header(skb)[nhoff]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 197 | raw = raw6_local_deliver(skb, nexthdr); |
David S. Miller | f9242b6 | 2012-06-19 18:56:21 -0700 | [diff] [blame] | 198 | if ((ipprot = rcu_dereference(inet6_protos[nexthdr])) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | int ret; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | if (ipprot->flags & INET6_PROTO_FINAL) { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 202 | const struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 204 | /* Free reference early: we don't need it any more, |
| 205 | and it may hold ip_conntrack module loaded |
| 206 | indefinitely. */ |
| 207 | nf_reset(skb); |
| 208 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 209 | skb_postpull_rcsum(skb, skb_network_header(skb), |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 210 | skb_network_header_len(skb)); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 211 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | if (ipv6_addr_is_multicast(&hdr->daddr) && |
| 213 | !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, |
| 214 | &hdr->saddr) && |
YOSHIFUJI Hideaki / 吉藤英明 | daad151 | 2013-01-13 05:02:18 +0000 | [diff] [blame] | 215 | !ipv6_is_mld(skb, nexthdr, skb_network_header_len(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | goto discard; |
| 217 | } |
| 218 | if (!(ipprot->flags & INET6_PROTO_NOPOLICY) && |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 219 | !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | goto discard; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 221 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 222 | ret = ipprot->handler(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | if (ret > 0) |
| 224 | goto resubmit; |
| 225 | else if (ret == 0) |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 226 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | } else { |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 228 | if (!raw) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 230 | IP6_INC_STATS_BH(net, idev, |
| 231 | IPSTATS_MIB_INUNKNOWNPROTOS); |
Patrick McHardy | fad87ac | 2005-08-16 21:03:41 -0700 | [diff] [blame] | 232 | icmpv6_send(skb, ICMPV6_PARAMPROB, |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 233 | ICMPV6_UNK_NEXTHDR, nhoff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | } |
Patrick McHardy | fad87ac | 2005-08-16 21:03:41 -0700 | [diff] [blame] | 235 | } else |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 236 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS); |
Patrick McHardy | fad87ac | 2005-08-16 21:03:41 -0700 | [diff] [blame] | 237 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
| 239 | rcu_read_unlock(); |
| 240 | return 0; |
| 241 | |
| 242 | discard: |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 243 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | rcu_read_unlock(); |
| 245 | kfree_skb(skb); |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | int ip6_input(struct sk_buff *skb) |
| 251 | { |
Jan Engelhardt | b2e0b38 | 2010-03-23 04:09:07 +0100 | [diff] [blame] | 252 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN, skb, skb->dev, NULL, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 253 | ip6_input_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } |
| 255 | |
| 256 | int ip6_mc_input(struct sk_buff *skb) |
| 257 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 258 | const struct ipv6hdr *hdr; |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 259 | bool deliver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 261 | IP6_UPD_PO_STATS_BH(dev_net(skb_dst(skb)->dev), |
| 262 | ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INMCAST, |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 263 | skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 265 | hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 4c7966b | 2008-03-31 19:30:45 -0700 | [diff] [blame] | 266 | deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 268 | #ifdef CONFIG_IPV6_MROUTE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | /* |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 270 | * IPv6 multicast router mode is now supported ;) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | */ |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 272 | if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding && |
Thomas Goff | 1d6e55f | 2009-01-27 22:39:59 -0800 | [diff] [blame] | 273 | !(ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) && |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 274 | likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) { |
| 275 | /* |
| 276 | * Okay, we try to forward - split and duplicate |
| 277 | * packets. |
| 278 | */ |
| 279 | struct sk_buff *skb2; |
| 280 | struct inet6_skb_parm *opt = IP6CB(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 282 | /* Check for MLD */ |
YOSHIFUJI Hideaki / 吉藤英明 | dd3332b | 2013-01-13 05:02:45 +0000 | [diff] [blame^] | 283 | if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 284 | /* Check if this is a mld message */ |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 285 | u8 nexthdr = hdr->nexthdr; |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 286 | __be16 frag_off; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 287 | int offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 289 | /* Check if the value of Router Alert |
| 290 | * is for MLD (0x0000). |
| 291 | */ |
YOSHIFUJI Hideaki / 吉藤英明 | dd3332b | 2013-01-13 05:02:45 +0000 | [diff] [blame^] | 292 | if (opt->ra == htons(IPV6_OPT_ROUTERALERT_MLD)) { |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 293 | deliver = false; |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 294 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 295 | if (!ipv6_ext_hdr(nexthdr)) { |
| 296 | /* BUG */ |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 297 | goto out; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 298 | } |
| 299 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 300 | &nexthdr, &frag_off); |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 301 | if (offset < 0) |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 302 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
YOSHIFUJI Hideaki / 吉藤英明 | daad151 | 2013-01-13 05:02:18 +0000 | [diff] [blame] | 304 | if (!ipv6_is_mld(skb, nexthdr, offset)) |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 305 | goto out; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 306 | |
YOSHIFUJI Hideaki / 吉藤英明 | daad151 | 2013-01-13 05:02:18 +0000 | [diff] [blame] | 307 | deliver = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | } |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 309 | /* unknown RA - process it normally */ |
| 310 | } |
| 311 | |
| 312 | if (deliver) |
| 313 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 314 | else { |
| 315 | skb2 = skb; |
| 316 | skb = NULL; |
| 317 | } |
| 318 | |
| 319 | if (skb2) { |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 320 | ip6_mr_input(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
| 322 | } |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 323 | out: |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 324 | #endif |
| 325 | if (likely(deliver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | ip6_input(skb); |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 327 | else { |
| 328 | /* discard */ |
| 329 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
| 332 | return 0; |
| 333 | } |