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 | * |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 18 | * Mitsuru KANDA @USAGI and |
| 19 | * YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Eric Dumazet | 1f07d03 | 2013-08-06 03:32:11 -0700 | [diff] [blame] | 47 | #include <net/inet_ecn.h> |
Wei-Chun Chao | 48fb6b5 | 2015-07-22 18:13:12 -0700 | [diff] [blame] | 48 | #include <net/dst_metadata.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 50 | int ip6_rcv_finish(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
Holger Eitzenberger | a452ce3 | 2014-01-27 10:33:18 +0100 | [diff] [blame] | 52 | if (sysctl_ip_early_demux && !skb_dst(skb) && skb->sk == NULL) { |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 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 | } |
Wei-Chun Chao | 48fb6b5 | 2015-07-22 18:13:12 -0700 | [diff] [blame] | 59 | if (!skb_valid_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; |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [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 | */ |
Wei-Chun Chao | 48fb6b5 | 2015-07-22 18:13:12 -0700 | [diff] [blame] | 102 | IP6CB(skb)->iif = skb_valid_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 | |
Eric Dumazet | 1f07d03 | 2013-08-06 03:32:11 -0700 | [diff] [blame] | 112 | IP6_ADD_STATS_BH(dev_net(dev), idev, |
| 113 | IPSTATS_MIB_NOECTPKTS + |
| 114 | (ipv6_get_dsfield(hdr) & INET_ECN_MASK), |
| 115 | max_t(unsigned short, 1, skb_shinfo(skb)->gso_segs)); |
YOSHIFUJI Hideaki | f630e43 | 2008-06-19 16:33:57 -0700 | [diff] [blame] | 116 | /* |
| 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 Sowa | 1c4a154 | 2013-03-26 08:13:34 +0000 | [diff] [blame] | 125 | /* 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 Sowa | 2031409 | 2013-02-10 05:35:22 +0000 | [diff] [blame] | 137 | /* 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 Haley | c457338 | 2011-11-08 04:41:42 +0000 | [diff] [blame] | 146 | /* |
| 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 Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 154 | skb->transport_header = skb->network_header + sizeof(*hdr); |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 155 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
| 156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | 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 Chinen | 60e5c16 | 2007-04-04 23:54:59 -0700 | [diff] [blame] | 161 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 162 | IP6_INC_STATS_BH(net, |
| 163 | idev, IPSTATS_MIB_INTRUNCATEDPKTS); |
Mitsuru Chinen | 60e5c16 | 2007-04-04 23:54:59 -0700 | [diff] [blame] | 164 | goto drop; |
| 165 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 167 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | goto drop; |
| 169 | } |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 170 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | if (hdr->nexthdr == NEXTHDR_HOP) { |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 174 | if (ipv6_parse_hopopts(skb) < 0) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 175 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 176 | rcu_read_unlock(); |
Mark Smith | 5c91fac | 2009-07-06 11:26:24 +0000 | [diff] [blame] | 177 | return NET_RX_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } |
| 180 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 181 | rcu_read_unlock(); |
| 182 | |
Herbert Xu | 71f9dac | 2009-06-26 19:22:37 -0700 | [diff] [blame] | 183 | /* Must drop socket now because of tproxy. */ |
| 184 | skb_orphan(skb); |
| 185 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 186 | return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, NULL, skb, |
| 187 | dev, NULL, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 188 | ip6_rcv_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | err: |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 190 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | drop: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 192 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | kfree_skb(skb); |
Mark Smith | 5c91fac | 2009-07-06 11:26:24 +0000 | [diff] [blame] | 194 | return NET_RX_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Deliver the packet to the host |
| 199 | */ |
| 200 | |
| 201 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 202 | static int ip6_input_finish(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | { |
David S. Miller | f9242b6 | 2012-06-19 18:56:21 -0700 | [diff] [blame] | 204 | struct net *net = dev_net(skb_dst(skb)->dev); |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 205 | const struct inet6_protocol *ipprot; |
David S. Miller | f9242b6 | 2012-06-19 18:56:21 -0700 | [diff] [blame] | 206 | struct inet6_dev *idev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | unsigned int nhoff; |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 208 | int nexthdr; |
| 209 | bool raw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | /* |
| 212 | * Parse extension headers |
| 213 | */ |
| 214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | rcu_read_lock(); |
David S. Miller | 1b0ccfe | 2015-06-10 15:29:31 -0700 | [diff] [blame] | 216 | resubmit: |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 217 | idev = ip6_dst_idev(skb_dst(skb)); |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 218 | if (!pskb_pull(skb, skb_transport_offset(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | goto discard; |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 220 | nhoff = IP6CB(skb)->nhoff; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 221 | nexthdr = skb_network_header(skb)[nhoff]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 223 | raw = raw6_local_deliver(skb, nexthdr); |
Ian Morris | e5d08d7 | 2014-11-23 21:28:43 +0000 | [diff] [blame] | 224 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
Ian Morris | 53b24b8 | 2015-03-29 14:00:05 +0100 | [diff] [blame] | 225 | if (ipprot) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | int ret; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | if (ipprot->flags & INET6_PROTO_FINAL) { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 229 | const struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 231 | /* Free reference early: we don't need it any more, |
| 232 | and it may hold ip_conntrack module loaded |
| 233 | indefinitely. */ |
| 234 | nf_reset(skb); |
| 235 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 236 | skb_postpull_rcsum(skb, skb_network_header(skb), |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 237 | skb_network_header_len(skb)); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 238 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | if (ipv6_addr_is_multicast(&hdr->daddr) && |
| 240 | !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, |
| 241 | &hdr->saddr) && |
YOSHIFUJI Hideaki / 吉藤英明 | daad151 | 2013-01-13 05:02:18 +0000 | [diff] [blame] | 242 | !ipv6_is_mld(skb, nexthdr, skb_network_header_len(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | goto discard; |
| 244 | } |
| 245 | if (!(ipprot->flags & INET6_PROTO_NOPOLICY) && |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 246 | !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | goto discard; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 248 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 249 | ret = ipprot->handler(skb); |
David S. Miller | 1b0ccfe | 2015-06-10 15:29:31 -0700 | [diff] [blame] | 250 | if (ret > 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | goto resubmit; |
David S. Miller | 1b0ccfe | 2015-06-10 15:29:31 -0700 | [diff] [blame] | 252 | else if (ret == 0) |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 253 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } else { |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 255 | if (!raw) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 257 | IP6_INC_STATS_BH(net, idev, |
| 258 | IPSTATS_MIB_INUNKNOWNPROTOS); |
Patrick McHardy | fad87ac | 2005-08-16 21:03:41 -0700 | [diff] [blame] | 259 | icmpv6_send(skb, ICMPV6_PARAMPROB, |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 260 | ICMPV6_UNK_NEXTHDR, nhoff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | } |
Neil Horman | d8c6f4b | 2013-03-01 07:44:08 +0000 | [diff] [blame] | 262 | kfree_skb(skb); |
| 263 | } else { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 264 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS); |
Neil Horman | d8c6f4b | 2013-03-01 07:44:08 +0000 | [diff] [blame] | 265 | consume_skb(skb); |
| 266 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
| 268 | rcu_read_unlock(); |
| 269 | return 0; |
| 270 | |
| 271 | discard: |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 272 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | rcu_read_unlock(); |
| 274 | kfree_skb(skb); |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | |
| 279 | int ip6_input(struct sk_buff *skb) |
| 280 | { |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 281 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN, NULL, skb, |
| 282 | skb->dev, NULL, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 283 | ip6_input_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | int ip6_mc_input(struct sk_buff *skb) |
| 287 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 288 | const struct ipv6hdr *hdr; |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 289 | bool deliver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 291 | IP6_UPD_PO_STATS_BH(dev_net(skb_dst(skb)->dev), |
| 292 | ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INMCAST, |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 293 | skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 295 | hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 4c7966b | 2008-03-31 19:30:45 -0700 | [diff] [blame] | 296 | deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 298 | #ifdef CONFIG_IPV6_MROUTE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | /* |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 300 | * IPv6 multicast router mode is now supported ;) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | */ |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 302 | if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding && |
Hannes Frederic Sowa | ddf6435 | 2013-03-08 02:07:23 +0000 | [diff] [blame] | 303 | !(ipv6_addr_type(&hdr->daddr) & |
| 304 | (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)) && |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 305 | likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) { |
| 306 | /* |
| 307 | * Okay, we try to forward - split and duplicate |
| 308 | * packets. |
| 309 | */ |
| 310 | struct sk_buff *skb2; |
| 311 | struct inet6_skb_parm *opt = IP6CB(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 313 | /* Check for MLD */ |
YOSHIFUJI Hideaki / 吉藤英明 | dd3332b | 2013-01-13 05:02:45 +0000 | [diff] [blame] | 314 | if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 315 | /* Check if this is a mld message */ |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 316 | u8 nexthdr = hdr->nexthdr; |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 317 | __be16 frag_off; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 318 | int offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 320 | /* Check if the value of Router Alert |
| 321 | * is for MLD (0x0000). |
| 322 | */ |
YOSHIFUJI Hideaki / 吉藤英明 | dd3332b | 2013-01-13 05:02:45 +0000 | [diff] [blame] | 323 | if (opt->ra == htons(IPV6_OPT_ROUTERALERT_MLD)) { |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 324 | deliver = false; |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 325 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 326 | if (!ipv6_ext_hdr(nexthdr)) { |
| 327 | /* BUG */ |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 328 | goto out; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 329 | } |
| 330 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 331 | &nexthdr, &frag_off); |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 332 | if (offset < 0) |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 333 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
Angga | 4c938d2 | 2015-07-03 14:40:52 +1200 | [diff] [blame] | 335 | if (ipv6_is_mld(skb, nexthdr, offset)) |
| 336 | deliver = true; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 337 | |
Angga | 4c938d2 | 2015-07-03 14:40:52 +1200 | [diff] [blame] | 338 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | } |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 340 | /* unknown RA - process it normally */ |
| 341 | } |
| 342 | |
| 343 | if (deliver) |
| 344 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 345 | else { |
| 346 | skb2 = skb; |
| 347 | skb = NULL; |
| 348 | } |
| 349 | |
| 350 | if (skb2) { |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 351 | ip6_mr_input(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } |
| 353 | } |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 354 | out: |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 355 | #endif |
| 356 | if (likely(deliver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | ip6_input(skb); |
YOSHIFUJI Hideaki | aba6096 | 2008-04-10 15:41:26 +0900 | [diff] [blame] | 358 | else { |
| 359 | /* discard */ |
| 360 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | return 0; |
| 364 | } |