Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2 | * Linux NET3: GRE over IP protocol decoder. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | */ |
| 12 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 15 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/module.h> |
| 17 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/uaccess.h> |
| 21 | #include <linux/skbuff.h> |
| 22 | #include <linux/netdevice.h> |
| 23 | #include <linux/in.h> |
| 24 | #include <linux/tcp.h> |
| 25 | #include <linux/udp.h> |
| 26 | #include <linux/if_arp.h> |
| 27 | #include <linux/mroute.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/in6.h> |
| 30 | #include <linux/inetdevice.h> |
| 31 | #include <linux/igmp.h> |
| 32 | #include <linux/netfilter_ipv4.h> |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 33 | #include <linux/etherdevice.h> |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 34 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <net/sock.h> |
| 37 | #include <net/ip.h> |
| 38 | #include <net/icmp.h> |
| 39 | #include <net/protocol.h> |
| 40 | #include <net/ipip.h> |
| 41 | #include <net/arp.h> |
| 42 | #include <net/checksum.h> |
| 43 | #include <net/dsfield.h> |
| 44 | #include <net/inet_ecn.h> |
| 45 | #include <net/xfrm.h> |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 46 | #include <net/net_namespace.h> |
| 47 | #include <net/netns/generic.h> |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 48 | #include <net/rtnetlink.h> |
Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 49 | #include <net/gre.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 51 | #if IS_ENABLED(CONFIG_IPV6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include <net/ipv6.h> |
| 53 | #include <net/ip6_fib.h> |
| 54 | #include <net/ip6_route.h> |
| 55 | #endif |
| 56 | |
| 57 | /* |
| 58 | Problems & solutions |
| 59 | -------------------- |
| 60 | |
| 61 | 1. The most important issue is detecting local dead loops. |
| 62 | They would cause complete host lockup in transmit, which |
| 63 | would be "resolved" by stack overflow or, if queueing is enabled, |
| 64 | with infinite looping in net_bh. |
| 65 | |
| 66 | We cannot track such dead loops during route installation, |
| 67 | it is infeasible task. The most general solutions would be |
| 68 | to keep skb->encapsulation counter (sort of local ttl), |
Eric Dumazet | 6d0722a | 2010-09-29 23:35:10 -0700 | [diff] [blame] | 69 | and silently drop packet when it expires. It is a good |
stephen hemminger | bff5285 | 2012-02-24 08:08:20 +0000 | [diff] [blame] | 70 | solution, but it supposes maintaining new variable in ALL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | skb, even if no tunneling is used. |
| 72 | |
Eric Dumazet | 6d0722a | 2010-09-29 23:35:10 -0700 | [diff] [blame] | 73 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
| 74 | counter, since when we enter the first ndo_xmit(), cpu migration is |
| 75 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | 2. Networking dead loops would not kill routers, but would really |
| 78 | kill network. IP hop limit plays role of "t->recursion" in this case, |
| 79 | if we copy it from packet being encapsulated to upper header. |
| 80 | It is very good solution, but it introduces two problems: |
| 81 | |
| 82 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), |
| 83 | do not work over tunnels. |
| 84 | - traceroute does not work. I planned to relay ICMP from tunnel, |
| 85 | so that this problem would be solved and traceroute output |
| 86 | would even more informative. This idea appeared to be wrong: |
| 87 | only Linux complies to rfc1812 now (yes, guys, Linux is the only |
| 88 | true router now :-)), all routers (at least, in neighbourhood of mine) |
| 89 | return only 8 bytes of payload. It is the end. |
| 90 | |
| 91 | Hence, if we want that OSPF worked or traceroute said something reasonable, |
| 92 | we should search for another solution. |
| 93 | |
| 94 | One of them is to parse packet trying to detect inner encapsulation |
| 95 | made by our node. It is difficult or even impossible, especially, |
stephen hemminger | bff5285 | 2012-02-24 08:08:20 +0000 | [diff] [blame] | 96 | taking into account fragmentation. TO be short, ttl is not solution at all. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | Current solution: The solution was UNEXPECTEDLY SIMPLE. |
| 99 | We force DF flag on tunnels with preconfigured hop limit, |
| 100 | that is ALL. :-) Well, it does not remove the problem completely, |
| 101 | but exponential growth of network traffic is changed to linear |
| 102 | (branches, that exceed pmtu are pruned) and tunnel mtu |
stephen hemminger | bff5285 | 2012-02-24 08:08:20 +0000 | [diff] [blame] | 103 | rapidly degrades to value <68, where looping stops. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | Yes, it is not good if there exists a router in the loop, |
| 105 | which does not force DF, even when encapsulating packets have DF set. |
| 106 | But it is not our problem! Nobody could accuse us, we made |
| 107 | all that we could make. Even if it is your gated who injected |
| 108 | fatal route to network, even if it were you who configured |
| 109 | fatal static route: you are innocent. :-) |
| 110 | |
| 111 | |
| 112 | |
| 113 | 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain |
| 114 | practically identical code. It would be good to glue them |
| 115 | together, but it is not very evident, how to make them modular. |
| 116 | sit is integral part of IPv6, ipip and gre are naturally modular. |
| 117 | We could extract common parts (hash table, ioctl etc) |
| 118 | to a separate module (ip_tunnel.c). |
| 119 | |
| 120 | Alexey Kuznetsov. |
| 121 | */ |
| 122 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 123 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | static int ipgre_tunnel_init(struct net_device *dev); |
| 125 | static void ipgre_tunnel_setup(struct net_device *dev); |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 126 | static int ipgre_tunnel_bind_dev(struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | /* Fallback tunnel: no source, no destination, no key, no options */ |
| 129 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 130 | #define HASH_SIZE 16 |
| 131 | |
Eric Dumazet | f99189b | 2009-11-17 10:42:49 +0000 | [diff] [blame] | 132 | static int ipgre_net_id __read_mostly; |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 133 | struct ipgre_net { |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 134 | struct ip_tunnel __rcu *tunnels[4][HASH_SIZE]; |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 135 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 136 | struct net_device *fb_tunnel_dev; |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 137 | }; |
| 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | /* Tunnel hash table */ |
| 140 | |
| 141 | /* |
| 142 | 4 hash tables: |
| 143 | |
| 144 | 3: (remote,local) |
| 145 | 2: (remote,*) |
| 146 | 1: (*,local) |
| 147 | 0: (*,*) |
| 148 | |
| 149 | We require exact key match i.e. if a key is present in packet |
| 150 | it will match only tunnel with the same key; if it is not present, |
| 151 | it will match only keyless tunnel. |
| 152 | |
| 153 | All keysless packets, if not matched configured keyless tunnels |
| 154 | will match fallback tunnel. |
| 155 | */ |
| 156 | |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 157 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 159 | #define tunnels_r_l tunnels[3] |
| 160 | #define tunnels_r tunnels[2] |
| 161 | #define tunnels_l tunnels[1] |
| 162 | #define tunnels_wc tunnels[0] |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 163 | /* |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 164 | * Locking : hash tables are protected by RCU and RTNL |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 165 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 167 | #define for_each_ip_tunnel_rcu(start) \ |
| 168 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 170 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
| 171 | struct pcpu_tstats { |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 172 | u64 rx_packets; |
| 173 | u64 rx_bytes; |
| 174 | u64 tx_packets; |
| 175 | u64 tx_bytes; |
| 176 | struct u64_stats_sync syncp; |
| 177 | }; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 178 | |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 179 | static struct rtnl_link_stats64 *ipgre_get_stats64(struct net_device *dev, |
| 180 | struct rtnl_link_stats64 *tot) |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 181 | { |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 182 | int i; |
| 183 | |
| 184 | for_each_possible_cpu(i) { |
| 185 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 186 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
| 187 | unsigned int start; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 188 | |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 189 | do { |
| 190 | start = u64_stats_fetch_begin_bh(&tstats->syncp); |
| 191 | rx_packets = tstats->rx_packets; |
| 192 | tx_packets = tstats->tx_packets; |
| 193 | rx_bytes = tstats->rx_bytes; |
| 194 | tx_bytes = tstats->tx_bytes; |
| 195 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); |
| 196 | |
| 197 | tot->rx_packets += rx_packets; |
| 198 | tot->tx_packets += tx_packets; |
| 199 | tot->rx_bytes += rx_bytes; |
| 200 | tot->tx_bytes += tx_bytes; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 201 | } |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 202 | |
| 203 | tot->multicast = dev->stats.multicast; |
| 204 | tot->rx_crc_errors = dev->stats.rx_crc_errors; |
| 205 | tot->rx_fifo_errors = dev->stats.rx_fifo_errors; |
| 206 | tot->rx_length_errors = dev->stats.rx_length_errors; |
| 207 | tot->rx_errors = dev->stats.rx_errors; |
| 208 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
| 209 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; |
| 210 | tot->tx_dropped = dev->stats.tx_dropped; |
| 211 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; |
| 212 | tot->tx_errors = dev->stats.tx_errors; |
| 213 | |
| 214 | return tot; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 215 | } |
| 216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | /* Given src, dst and key, find appropriate for input tunnel. */ |
| 218 | |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 219 | static struct ip_tunnel *ipgre_tunnel_lookup(struct net_device *dev, |
| 220 | __be32 remote, __be32 local, |
| 221 | __be32 key, __be16 gre_proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | { |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 223 | struct net *net = dev_net(dev); |
| 224 | int link = dev->ifindex; |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 225 | unsigned int h0 = HASH(remote); |
| 226 | unsigned int h1 = HASH(key); |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 227 | struct ip_tunnel *t, *cand = NULL; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 228 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 229 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
| 230 | ARPHRD_ETHER : ARPHRD_IPGRE; |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 231 | int score, cand_score = 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 233 | for_each_ip_tunnel_rcu(ign->tunnels_r_l[h0 ^ h1]) { |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 234 | if (local != t->parms.iph.saddr || |
| 235 | remote != t->parms.iph.daddr || |
| 236 | key != t->parms.i_key || |
| 237 | !(t->dev->flags & IFF_UP)) |
| 238 | continue; |
| 239 | |
| 240 | if (t->dev->type != ARPHRD_IPGRE && |
| 241 | t->dev->type != dev_type) |
| 242 | continue; |
| 243 | |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 244 | score = 0; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 245 | if (t->parms.link != link) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 246 | score |= 1; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 247 | if (t->dev->type != dev_type) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 248 | score |= 2; |
| 249 | if (score == 0) |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 250 | return t; |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 251 | |
| 252 | if (score < cand_score) { |
| 253 | cand = t; |
| 254 | cand_score = score; |
| 255 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 257 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 258 | for_each_ip_tunnel_rcu(ign->tunnels_r[h0 ^ h1]) { |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 259 | if (remote != t->parms.iph.daddr || |
| 260 | key != t->parms.i_key || |
| 261 | !(t->dev->flags & IFF_UP)) |
| 262 | continue; |
| 263 | |
| 264 | if (t->dev->type != ARPHRD_IPGRE && |
| 265 | t->dev->type != dev_type) |
| 266 | continue; |
| 267 | |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 268 | score = 0; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 269 | if (t->parms.link != link) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 270 | score |= 1; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 271 | if (t->dev->type != dev_type) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 272 | score |= 2; |
| 273 | if (score == 0) |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 274 | return t; |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 275 | |
| 276 | if (score < cand_score) { |
| 277 | cand = t; |
| 278 | cand_score = score; |
| 279 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 281 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 282 | for_each_ip_tunnel_rcu(ign->tunnels_l[h1]) { |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 283 | if ((local != t->parms.iph.saddr && |
| 284 | (local != t->parms.iph.daddr || |
| 285 | !ipv4_is_multicast(local))) || |
| 286 | key != t->parms.i_key || |
| 287 | !(t->dev->flags & IFF_UP)) |
| 288 | continue; |
| 289 | |
| 290 | if (t->dev->type != ARPHRD_IPGRE && |
| 291 | t->dev->type != dev_type) |
| 292 | continue; |
| 293 | |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 294 | score = 0; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 295 | if (t->parms.link != link) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 296 | score |= 1; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 297 | if (t->dev->type != dev_type) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 298 | score |= 2; |
| 299 | if (score == 0) |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 300 | return t; |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 301 | |
| 302 | if (score < cand_score) { |
| 303 | cand = t; |
| 304 | cand_score = score; |
| 305 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 307 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 308 | for_each_ip_tunnel_rcu(ign->tunnels_wc[h1]) { |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 309 | if (t->parms.i_key != key || |
| 310 | !(t->dev->flags & IFF_UP)) |
| 311 | continue; |
| 312 | |
| 313 | if (t->dev->type != ARPHRD_IPGRE && |
| 314 | t->dev->type != dev_type) |
| 315 | continue; |
| 316 | |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 317 | score = 0; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 318 | if (t->parms.link != link) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 319 | score |= 1; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 320 | if (t->dev->type != dev_type) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 321 | score |= 2; |
| 322 | if (score == 0) |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 323 | return t; |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 324 | |
| 325 | if (score < cand_score) { |
| 326 | cand = t; |
| 327 | cand_score = score; |
| 328 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | } |
| 330 | |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 331 | if (cand != NULL) |
| 332 | return cand; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 333 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 334 | dev = ign->fb_tunnel_dev; |
| 335 | if (dev->flags & IFF_UP) |
| 336 | return netdev_priv(dev); |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 337 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | return NULL; |
| 339 | } |
| 340 | |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 341 | static struct ip_tunnel __rcu **__ipgre_bucket(struct ipgre_net *ign, |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 342 | struct ip_tunnel_parm *parms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 344 | __be32 remote = parms->iph.daddr; |
| 345 | __be32 local = parms->iph.saddr; |
| 346 | __be32 key = parms->i_key; |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 347 | unsigned int h = HASH(key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | int prio = 0; |
| 349 | |
| 350 | if (local) |
| 351 | prio |= 1; |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 352 | if (remote && !ipv4_is_multicast(remote)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | prio |= 2; |
| 354 | h ^= HASH(remote); |
| 355 | } |
| 356 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 357 | return &ign->tunnels[prio][h]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
| 359 | |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 360 | static inline struct ip_tunnel __rcu **ipgre_bucket(struct ipgre_net *ign, |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 361 | struct ip_tunnel *t) |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 362 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 363 | return __ipgre_bucket(ign, &t->parms); |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 364 | } |
| 365 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 366 | static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | { |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 368 | struct ip_tunnel __rcu **tp = ipgre_bucket(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 370 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 371 | rcu_assign_pointer(*tp, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
| 373 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 374 | static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | { |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 376 | struct ip_tunnel __rcu **tp; |
| 377 | struct ip_tunnel *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 379 | for (tp = ipgre_bucket(ign, t); |
| 380 | (iter = rtnl_dereference(*tp)) != NULL; |
| 381 | tp = &iter->next) { |
| 382 | if (t == iter) { |
| 383 | rcu_assign_pointer(*tp, t->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | break; |
| 385 | } |
| 386 | } |
| 387 | } |
| 388 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 389 | static struct ip_tunnel *ipgre_tunnel_find(struct net *net, |
| 390 | struct ip_tunnel_parm *parms, |
| 391 | int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 393 | __be32 remote = parms->iph.daddr; |
| 394 | __be32 local = parms->iph.saddr; |
| 395 | __be32 key = parms->i_key; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 396 | int link = parms->link; |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 397 | struct ip_tunnel *t; |
| 398 | struct ip_tunnel __rcu **tp; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 399 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 400 | |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 401 | for (tp = __ipgre_bucket(ign, parms); |
| 402 | (t = rtnl_dereference(*tp)) != NULL; |
| 403 | tp = &t->next) |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 404 | if (local == t->parms.iph.saddr && |
| 405 | remote == t->parms.iph.daddr && |
| 406 | key == t->parms.i_key && |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 407 | link == t->parms.link && |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 408 | type == t->dev->type) |
| 409 | break; |
| 410 | |
| 411 | return t; |
| 412 | } |
| 413 | |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 414 | static struct ip_tunnel *ipgre_tunnel_locate(struct net *net, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 415 | struct ip_tunnel_parm *parms, int create) |
| 416 | { |
| 417 | struct ip_tunnel *t, *nt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | char name[IFNAMSIZ]; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 420 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 422 | t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE); |
| 423 | if (t || !create) |
| 424 | return t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | |
| 426 | if (parms->name[0]) |
| 427 | strlcpy(name, parms->name, IFNAMSIZ); |
Pavel Emelyanov | 34cc7ba | 2008-02-23 20:19:20 -0800 | [diff] [blame] | 428 | else |
stephen hemminger | 407d6fc | 2010-11-29 09:47:47 +0000 | [diff] [blame] | 429 | strcpy(name, "gre%d"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
| 431 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); |
| 432 | if (!dev) |
stephen hemminger | 407d6fc | 2010-11-29 09:47:47 +0000 | [diff] [blame] | 433 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
Pavel Emelyanov | 0b67ece | 2008-04-16 01:11:13 -0700 | [diff] [blame] | 435 | dev_net_set(dev, net); |
| 436 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 437 | nt = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | nt->parms = *parms; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 439 | dev->rtnl_link_ops = &ipgre_link_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 441 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
| 442 | |
Pavel Emelyanov | b37d428b | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 443 | if (register_netdevice(dev) < 0) |
| 444 | goto failed_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
Willem de Bruijn | f2b3ee9 | 2012-01-26 10:34:35 +0000 | [diff] [blame] | 446 | /* Can use a lockless transmit, unless we generate output sequences */ |
| 447 | if (!(nt->parms.o_flags & GRE_SEQ)) |
| 448 | dev->features |= NETIF_F_LLTX; |
| 449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | dev_hold(dev); |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 451 | ipgre_tunnel_link(ign, nt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | return nt; |
| 453 | |
Pavel Emelyanov | b37d428b | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 454 | failed_free: |
| 455 | free_netdev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | return NULL; |
| 457 | } |
| 458 | |
| 459 | static void ipgre_tunnel_uninit(struct net_device *dev) |
| 460 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 461 | struct net *net = dev_net(dev); |
| 462 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 463 | |
| 464 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | dev_put(dev); |
| 466 | } |
| 467 | |
| 468 | |
| 469 | static void ipgre_err(struct sk_buff *skb, u32 info) |
| 470 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
Rami Rosen | 071f92d | 2008-05-21 17:47:54 -0700 | [diff] [blame] | 472 | /* All the routers (except for Linux) return only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | 8 bytes of packet payload. It means, that precise relaying of |
| 474 | ICMP in the real Internet is absolutely infeasible. |
| 475 | |
| 476 | Moreover, Cisco "wise men" put GRE key to the third word |
| 477 | in GRE header. It makes impossible maintaining even soft state for keyed |
| 478 | GRE tunnels with enabled checksum. Tell them "thank you". |
| 479 | |
| 480 | Well, I wonder, rfc1812 was written by Cisco employee, |
stephen hemminger | bff5285 | 2012-02-24 08:08:20 +0000 | [diff] [blame] | 481 | what the hell these idiots break standards established |
| 482 | by themselves??? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | */ |
| 484 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 485 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 486 | __be16 *p = (__be16 *)(skb->data+(iph->ihl<<2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | int grehlen = (iph->ihl<<2) + 4; |
Arnaldo Carvalho de Melo | 88c7664 | 2007-03-13 14:43:18 -0300 | [diff] [blame] | 488 | const int type = icmp_hdr(skb)->type; |
| 489 | const int code = icmp_hdr(skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | struct ip_tunnel *t; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 491 | __be16 flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | |
| 493 | flags = p[0]; |
| 494 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { |
| 495 | if (flags&(GRE_VERSION|GRE_ROUTING)) |
| 496 | return; |
| 497 | if (flags&GRE_KEY) { |
| 498 | grehlen += 4; |
| 499 | if (flags&GRE_CSUM) |
| 500 | grehlen += 4; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | /* If only 8 bytes returned, keyed message will be dropped here */ |
| 505 | if (skb_headlen(skb) < grehlen) |
| 506 | return; |
| 507 | |
| 508 | switch (type) { |
| 509 | default: |
| 510 | case ICMP_PARAMETERPROB: |
| 511 | return; |
| 512 | |
| 513 | case ICMP_DEST_UNREACH: |
| 514 | switch (code) { |
| 515 | case ICMP_SR_FAILED: |
| 516 | case ICMP_PORT_UNREACH: |
| 517 | /* Impossible event. */ |
| 518 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | default: |
| 520 | /* All others are translated to HOST_UNREACH. |
| 521 | rfc2003 contains "deep thoughts" about NET_UNREACH, |
| 522 | I believe they are just ether pollution. --ANK |
| 523 | */ |
| 524 | break; |
| 525 | } |
| 526 | break; |
| 527 | case ICMP_TIME_EXCEEDED: |
| 528 | if (code != ICMP_EXC_TTL) |
| 529 | return; |
| 530 | break; |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 531 | |
| 532 | case ICMP_REDIRECT: |
| 533 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | } |
| 535 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 536 | rcu_read_lock(); |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 537 | t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 538 | flags & GRE_KEY ? |
| 539 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, |
| 540 | p[1]); |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 541 | if (t == NULL) |
| 542 | goto out; |
| 543 | |
| 544 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { |
| 545 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, |
| 546 | t->parms.link, 0, IPPROTO_GRE, 0); |
| 547 | goto out; |
| 548 | } |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 549 | if (type == ICMP_REDIRECT) { |
| 550 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, |
| 551 | IPPROTO_GRE, 0); |
| 552 | goto out; |
| 553 | } |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 554 | if (t->parms.iph.daddr == 0 || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 555 | ipv4_is_multicast(t->parms.iph.daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | goto out; |
| 557 | |
| 558 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
| 559 | goto out; |
| 560 | |
Wei Yongjun | da6185d8 | 2009-02-24 23:34:48 -0800 | [diff] [blame] | 561 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | t->err_count++; |
| 563 | else |
| 564 | t->err_count = 1; |
| 565 | t->err_time = jiffies; |
| 566 | out: |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 567 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | } |
| 569 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 570 | static inline void ipgre_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | { |
| 572 | if (INET_ECN_is_ce(iph->tos)) { |
| 573 | if (skb->protocol == htons(ETH_P_IP)) { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 574 | IP_ECN_set_ce(ip_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 576 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | } |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | static inline u8 |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 582 | ipgre_ecn_encapsulate(u8 tos, const struct iphdr *old_iph, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | { |
| 584 | u8 inner = 0; |
| 585 | if (skb->protocol == htons(ETH_P_IP)) |
| 586 | inner = old_iph->tos; |
| 587 | else if (skb->protocol == htons(ETH_P_IPV6)) |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 588 | inner = ipv6_get_dsfield((const struct ipv6hdr *)old_iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | return INET_ECN_encapsulate(tos, inner); |
| 590 | } |
| 591 | |
| 592 | static int ipgre_rcv(struct sk_buff *skb) |
| 593 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 594 | const struct iphdr *iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | u8 *h; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 596 | __be16 flags; |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 597 | __sum16 csum = 0; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 598 | __be32 key = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | u32 seqno = 0; |
| 600 | struct ip_tunnel *tunnel; |
| 601 | int offset = 4; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 602 | __be16 gre_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | if (!pskb_may_pull(skb, 16)) |
| 605 | goto drop_nolock; |
| 606 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 607 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | h = skb->data; |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 609 | flags = *(__be16 *)h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
| 611 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { |
| 612 | /* - Version must be 0. |
| 613 | - We do not support routing headers. |
| 614 | */ |
| 615 | if (flags&(GRE_VERSION|GRE_ROUTING)) |
| 616 | goto drop_nolock; |
| 617 | |
| 618 | if (flags&GRE_CSUM) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 619 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 620 | case CHECKSUM_COMPLETE: |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 621 | csum = csum_fold(skb->csum); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 622 | if (!csum) |
| 623 | break; |
| 624 | /* fall through */ |
| 625 | case CHECKSUM_NONE: |
| 626 | skb->csum = 0; |
| 627 | csum = __skb_checksum_complete(skb); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 628 | skb->ip_summed = CHECKSUM_COMPLETE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | } |
| 630 | offset += 4; |
| 631 | } |
| 632 | if (flags&GRE_KEY) { |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 633 | key = *(__be32 *)(h + offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | offset += 4; |
| 635 | } |
| 636 | if (flags&GRE_SEQ) { |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 637 | seqno = ntohl(*(__be32 *)(h + offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | offset += 4; |
| 639 | } |
| 640 | } |
| 641 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 642 | gre_proto = *(__be16 *)(h + 2); |
| 643 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 644 | rcu_read_lock(); |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 645 | if ((tunnel = ipgre_tunnel_lookup(skb->dev, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 646 | iph->saddr, iph->daddr, key, |
| 647 | gre_proto))) { |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 648 | struct pcpu_tstats *tstats; |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 649 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | secpath_reset(skb); |
| 651 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 652 | skb->protocol = gre_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | /* WCCP version 1 and 2 protocol decoding. |
| 654 | * - Change protocol to IP |
| 655 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header |
| 656 | */ |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 657 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
YOSHIFUJI Hideaki | 496c98d | 2006-10-10 19:41:21 -0700 | [diff] [blame] | 658 | skb->protocol = htons(ETH_P_IP); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 659 | if ((*(h + offset) & 0xF0) != 0x40) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | offset += 4; |
| 661 | } |
| 662 | |
Timo Teras | 1d06916 | 2007-12-20 00:10:33 -0800 | [diff] [blame] | 663 | skb->mac_header = skb->network_header; |
Arnaldo Carvalho de Melo | 4209fb6 | 2007-03-10 18:42:03 -0300 | [diff] [blame] | 664 | __pskb_pull(skb, offset); |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 665 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | skb->pkt_type = PACKET_HOST; |
| 667 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 668 | if (ipv4_is_multicast(iph->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | /* Looped back packet, drop it! */ |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 670 | if (rt_is_output_route(skb_rtable(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | goto drop; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 672 | tunnel->dev->stats.multicast++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | skb->pkt_type = PACKET_BROADCAST; |
| 674 | } |
| 675 | #endif |
| 676 | |
| 677 | if (((flags&GRE_CSUM) && csum) || |
| 678 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 679 | tunnel->dev->stats.rx_crc_errors++; |
| 680 | tunnel->dev->stats.rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | goto drop; |
| 682 | } |
| 683 | if (tunnel->parms.i_flags&GRE_SEQ) { |
| 684 | if (!(flags&GRE_SEQ) || |
| 685 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 686 | tunnel->dev->stats.rx_fifo_errors++; |
| 687 | tunnel->dev->stats.rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | goto drop; |
| 689 | } |
| 690 | tunnel->i_seqno = seqno + 1; |
| 691 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 692 | |
| 693 | /* Warning: All skb pointers will be invalidated! */ |
| 694 | if (tunnel->dev->type == ARPHRD_ETHER) { |
| 695 | if (!pskb_may_pull(skb, ETH_HLEN)) { |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 696 | tunnel->dev->stats.rx_length_errors++; |
| 697 | tunnel->dev->stats.rx_errors++; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 698 | goto drop; |
| 699 | } |
| 700 | |
| 701 | iph = ip_hdr(skb); |
| 702 | skb->protocol = eth_type_trans(skb, tunnel->dev); |
| 703 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| 704 | } |
| 705 | |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 706 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 707 | u64_stats_update_begin(&tstats->syncp); |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 708 | tstats->rx_packets++; |
| 709 | tstats->rx_bytes += skb->len; |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 710 | u64_stats_update_end(&tstats->syncp); |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 711 | |
| 712 | __skb_tunnel_rx(skb, tunnel->dev); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 713 | |
| 714 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | ipgre_ecn_decapsulate(iph, skb); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 716 | |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 717 | netif_rx(skb); |
Eric Dumazet | 8990f46 | 2010-09-20 00:12:11 +0000 | [diff] [blame] | 718 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 719 | rcu_read_unlock(); |
Eric Dumazet | 8990f46 | 2010-09-20 00:12:11 +0000 | [diff] [blame] | 720 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | } |
Herbert Xu | 45af08b | 2006-04-05 22:31:19 -0700 | [diff] [blame] | 722 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | drop: |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 725 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | drop_nolock: |
| 727 | kfree_skb(skb); |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 728 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | } |
| 730 | |
Stephen Hemminger | 6fef4c0 | 2009-08-31 19:50:41 +0000 | [diff] [blame] | 731 | static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 733 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 734 | struct pcpu_tstats *tstats; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 735 | const struct iphdr *old_iph = ip_hdr(skb); |
| 736 | const struct iphdr *tiph; |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 737 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | u8 tos; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 739 | __be16 df; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | struct rtable *rt; /* Route to the other host */ |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 741 | struct net_device *tdev; /* Device to other host */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | struct iphdr *iph; /* Our new IP header */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 743 | unsigned int max_headroom; /* The extra header space needed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | int gre_hlen; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 745 | __be32 dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | int mtu; |
| 747 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 748 | if (dev->type == ARPHRD_ETHER) |
| 749 | IPCB(skb)->flags = 0; |
| 750 | |
| 751 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | gre_hlen = 0; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 753 | tiph = (const struct iphdr *)skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | } else { |
| 755 | gre_hlen = tunnel->hlen; |
| 756 | tiph = &tunnel->parms.iph; |
| 757 | } |
| 758 | |
| 759 | if ((dst = tiph->daddr) == 0) { |
| 760 | /* NBMA tunnel */ |
| 761 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 762 | if (skb_dst(skb) == NULL) { |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 763 | dev->stats.tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | goto tx_error; |
| 765 | } |
| 766 | |
David S. Miller | 61d57f8 | 2012-01-24 18:23:30 -0500 | [diff] [blame] | 767 | if (skb->protocol == htons(ETH_P_IP)) { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 768 | rt = skb_rtable(skb); |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 769 | dst = rt_nexthop(rt, old_iph->daddr); |
David S. Miller | 61d57f8 | 2012-01-24 18:23:30 -0500 | [diff] [blame] | 770 | } |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 771 | #if IS_ENABLED(CONFIG_IPV6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 773 | const struct in6_addr *addr6; |
David S. Miller | 0ec8866 | 2012-01-27 15:01:08 -0800 | [diff] [blame] | 774 | struct neighbour *neigh; |
| 775 | bool do_tx_error_icmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | int addr_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
David S. Miller | 0ec8866 | 2012-01-27 15:01:08 -0800 | [diff] [blame] | 778 | neigh = dst_neigh_lookup(skb_dst(skb), &ipv6_hdr(skb)->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | if (neigh == NULL) |
| 780 | goto tx_error; |
| 781 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 782 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | addr_type = ipv6_addr_type(addr6); |
| 784 | |
| 785 | if (addr_type == IPV6_ADDR_ANY) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 786 | addr6 = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | addr_type = ipv6_addr_type(addr6); |
| 788 | } |
| 789 | |
| 790 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) |
David S. Miller | 0ec8866 | 2012-01-27 15:01:08 -0800 | [diff] [blame] | 791 | do_tx_error_icmp = true; |
| 792 | else { |
| 793 | do_tx_error_icmp = false; |
| 794 | dst = addr6->s6_addr32[3]; |
| 795 | } |
| 796 | neigh_release(neigh); |
| 797 | if (do_tx_error_icmp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | goto tx_error_icmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | } |
| 800 | #endif |
| 801 | else |
| 802 | goto tx_error; |
| 803 | } |
| 804 | |
| 805 | tos = tiph->tos; |
Andreas Jaggi | ee686ca | 2009-07-14 09:35:59 -0700 | [diff] [blame] | 806 | if (tos == 1) { |
| 807 | tos = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | if (skb->protocol == htons(ETH_P_IP)) |
| 809 | tos = old_iph->tos; |
Stephen Hemminger | dd4ba83 | 2010-07-08 21:35:58 -0700 | [diff] [blame] | 810 | else if (skb->protocol == htons(ETH_P_IPV6)) |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 811 | tos = ipv6_get_dsfield((const struct ipv6hdr *)old_iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | } |
| 813 | |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 814 | rt = ip_route_output_gre(dev_net(dev), &fl4, dst, tiph->saddr, |
David S. Miller | 78fbfd8 | 2011-03-12 00:00:52 -0500 | [diff] [blame] | 815 | tunnel->parms.o_key, RT_TOS(tos), |
| 816 | tunnel->parms.link); |
| 817 | if (IS_ERR(rt)) { |
| 818 | dev->stats.tx_carrier_errors++; |
| 819 | goto tx_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 821 | tdev = rt->dst.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
| 823 | if (tdev == dev) { |
| 824 | ip_rt_put(rt); |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 825 | dev->stats.collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | goto tx_error; |
| 827 | } |
| 828 | |
| 829 | df = tiph->frag_off; |
| 830 | if (df) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 831 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - tunnel->hlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | else |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 833 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 835 | if (skb_dst(skb)) |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 836 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
| 838 | if (skb->protocol == htons(ETH_P_IP)) { |
| 839 | df |= (old_iph->frag_off&htons(IP_DF)); |
| 840 | |
| 841 | if ((old_iph->frag_off&htons(IP_DF)) && |
| 842 | mtu < ntohs(old_iph->tot_len)) { |
| 843 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
| 844 | ip_rt_put(rt); |
| 845 | goto tx_error; |
| 846 | } |
| 847 | } |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 848 | #if IS_ENABLED(CONFIG_IPV6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 850 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 852 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) { |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 853 | if ((tunnel->parms.iph.daddr && |
| 854 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | rt6->rt6i_dst.plen == 128) { |
| 856 | rt6->rt6i_flags |= RTF_MODIFIED; |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 857 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | } |
| 859 | } |
| 860 | |
| 861 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 862 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | ip_rt_put(rt); |
| 864 | goto tx_error; |
| 865 | } |
| 866 | } |
| 867 | #endif |
| 868 | |
| 869 | if (tunnel->err_count > 0) { |
Wei Yongjun | da6185d8 | 2009-02-24 23:34:48 -0800 | [diff] [blame] | 870 | if (time_before(jiffies, |
| 871 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | tunnel->err_count--; |
| 873 | |
| 874 | dst_link_failure(skb); |
| 875 | } else |
| 876 | tunnel->err_count = 0; |
| 877 | } |
| 878 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 879 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
Patrick McHardy | cfbba49 | 2007-07-09 15:33:40 -0700 | [diff] [blame] | 881 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
| 882 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
Herbert Xu | 805dc1d | 2011-11-18 02:20:06 +0000 | [diff] [blame] | 884 | if (max_headroom > dev->needed_headroom) |
| 885 | dev->needed_headroom = max_headroom; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | if (!new_skb) { |
| 887 | ip_rt_put(rt); |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 888 | dev->stats.tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 890 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | } |
| 892 | if (skb->sk) |
| 893 | skb_set_owner_w(new_skb, skb->sk); |
| 894 | dev_kfree_skb(skb); |
| 895 | skb = new_skb; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 896 | old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | } |
| 898 | |
Herbert Xu | 64194c3 | 2008-10-09 12:03:17 -0700 | [diff] [blame] | 899 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 900 | skb_push(skb, gre_hlen); |
| 901 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
Patrick McHardy | 48d5cad | 2006-02-15 15:10:22 -0800 | [diff] [blame] | 903 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
| 904 | IPSKB_REROUTED); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 905 | skb_dst_drop(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 906 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
| 908 | /* |
| 909 | * Push down and install the IPIP header. |
| 910 | */ |
| 911 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 912 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | iph->version = 4; |
| 914 | iph->ihl = sizeof(struct iphdr) >> 2; |
| 915 | iph->frag_off = df; |
| 916 | iph->protocol = IPPROTO_GRE; |
| 917 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 918 | iph->daddr = fl4.daddr; |
| 919 | iph->saddr = fl4.saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
| 921 | if ((iph->ttl = tiph->ttl) == 0) { |
| 922 | if (skb->protocol == htons(ETH_P_IP)) |
| 923 | iph->ttl = old_iph->ttl; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 924 | #if IS_ENABLED(CONFIG_IPV6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | else if (skb->protocol == htons(ETH_P_IPV6)) |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 926 | iph->ttl = ((const struct ipv6hdr *)old_iph)->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | #endif |
| 928 | else |
David S. Miller | 323e126 | 2010-12-12 21:55:08 -0800 | [diff] [blame] | 929 | iph->ttl = ip4_dst_hoplimit(&rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | } |
| 931 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 932 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
| 933 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? |
| 934 | htons(ETH_P_TEB) : skb->protocol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | |
| 936 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 937 | __be32 *ptr = (__be32 *)(((u8 *)iph) + tunnel->hlen - 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
| 939 | if (tunnel->parms.o_flags&GRE_SEQ) { |
| 940 | ++tunnel->o_seqno; |
| 941 | *ptr = htonl(tunnel->o_seqno); |
| 942 | ptr--; |
| 943 | } |
| 944 | if (tunnel->parms.o_flags&GRE_KEY) { |
| 945 | *ptr = tunnel->parms.o_key; |
| 946 | ptr--; |
| 947 | } |
| 948 | if (tunnel->parms.o_flags&GRE_CSUM) { |
| 949 | *ptr = 0; |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 950 | *(__sum16 *)ptr = ip_compute_csum((void *)(iph+1), skb->len - sizeof(struct iphdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | } |
| 952 | } |
| 953 | |
| 954 | nf_reset(skb); |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 955 | tstats = this_cpu_ptr(dev->tstats); |
| 956 | __IPTUNNEL_XMIT(tstats, &dev->stats); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 957 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | |
David S. Miller | 496053f | 2012-01-11 16:46:32 -0800 | [diff] [blame] | 959 | #if IS_ENABLED(CONFIG_IPV6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | tx_error_icmp: |
| 961 | dst_link_failure(skb); |
David S. Miller | 496053f | 2012-01-11 16:46:32 -0800 | [diff] [blame] | 962 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | tx_error: |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 964 | dev->stats.tx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 966 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | } |
| 968 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 969 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 970 | { |
| 971 | struct net_device *tdev = NULL; |
| 972 | struct ip_tunnel *tunnel; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 973 | const struct iphdr *iph; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 974 | int hlen = LL_MAX_HEADER; |
| 975 | int mtu = ETH_DATA_LEN; |
| 976 | int addend = sizeof(struct iphdr) + 4; |
| 977 | |
| 978 | tunnel = netdev_priv(dev); |
| 979 | iph = &tunnel->parms.iph; |
| 980 | |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 981 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 982 | |
| 983 | if (iph->daddr) { |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 984 | struct flowi4 fl4; |
| 985 | struct rtable *rt; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 986 | |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 987 | rt = ip_route_output_gre(dev_net(dev), &fl4, |
| 988 | iph->daddr, iph->saddr, |
| 989 | tunnel->parms.o_key, |
| 990 | RT_TOS(iph->tos), |
| 991 | tunnel->parms.link); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 992 | if (!IS_ERR(rt)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 993 | tdev = rt->dst.dev; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 994 | ip_rt_put(rt); |
| 995 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 996 | |
| 997 | if (dev->type != ARPHRD_ETHER) |
| 998 | dev->flags |= IFF_POINTOPOINT; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 999 | } |
| 1000 | |
| 1001 | if (!tdev && tunnel->parms.link) |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 1002 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1003 | |
| 1004 | if (tdev) { |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 1005 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1006 | mtu = tdev->mtu; |
| 1007 | } |
| 1008 | dev->iflink = tunnel->parms.link; |
| 1009 | |
| 1010 | /* Precalculate GRE options length */ |
| 1011 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { |
| 1012 | if (tunnel->parms.o_flags&GRE_CSUM) |
| 1013 | addend += 4; |
| 1014 | if (tunnel->parms.o_flags&GRE_KEY) |
| 1015 | addend += 4; |
| 1016 | if (tunnel->parms.o_flags&GRE_SEQ) |
| 1017 | addend += 4; |
| 1018 | } |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 1019 | dev->needed_headroom = addend + hlen; |
Tom Goff | 8cdb045 | 2009-08-14 16:33:56 -0700 | [diff] [blame] | 1020 | mtu -= dev->hard_header_len + addend; |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 1021 | |
| 1022 | if (mtu < 68) |
| 1023 | mtu = 68; |
| 1024 | |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1025 | tunnel->hlen = addend; |
| 1026 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 1027 | return mtu; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1028 | } |
| 1029 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | static int |
| 1031 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) |
| 1032 | { |
| 1033 | int err = 0; |
| 1034 | struct ip_tunnel_parm p; |
| 1035 | struct ip_tunnel *t; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1036 | struct net *net = dev_net(dev); |
| 1037 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
| 1039 | switch (cmd) { |
| 1040 | case SIOCGETTUNNEL: |
| 1041 | t = NULL; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1042 | if (dev == ign->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| 1044 | err = -EFAULT; |
| 1045 | break; |
| 1046 | } |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1047 | t = ipgre_tunnel_locate(net, &p, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | } |
| 1049 | if (t == NULL) |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1050 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | memcpy(&p, &t->parms, sizeof(p)); |
| 1052 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 1053 | err = -EFAULT; |
| 1054 | break; |
| 1055 | |
| 1056 | case SIOCADDTUNNEL: |
| 1057 | case SIOCCHGTUNNEL: |
| 1058 | err = -EPERM; |
| 1059 | if (!capable(CAP_NET_ADMIN)) |
| 1060 | goto done; |
| 1061 | |
| 1062 | err = -EFAULT; |
| 1063 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 1064 | goto done; |
| 1065 | |
| 1066 | err = -EINVAL; |
| 1067 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || |
| 1068 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || |
| 1069 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) |
| 1070 | goto done; |
| 1071 | if (p.iph.ttl) |
| 1072 | p.iph.frag_off |= htons(IP_DF); |
| 1073 | |
| 1074 | if (!(p.i_flags&GRE_KEY)) |
| 1075 | p.i_key = 0; |
| 1076 | if (!(p.o_flags&GRE_KEY)) |
| 1077 | p.o_key = 0; |
| 1078 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1079 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1081 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | if (t != NULL) { |
| 1083 | if (t->dev != dev) { |
| 1084 | err = -EEXIST; |
| 1085 | break; |
| 1086 | } |
| 1087 | } else { |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 1088 | unsigned int nflags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1090 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1092 | if (ipv4_is_multicast(p.iph.daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | nflags = IFF_BROADCAST; |
| 1094 | else if (p.iph.daddr) |
| 1095 | nflags = IFF_POINTOPOINT; |
| 1096 | |
| 1097 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { |
| 1098 | err = -EINVAL; |
| 1099 | break; |
| 1100 | } |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1101 | ipgre_tunnel_unlink(ign, t); |
Pavel Emelyanov | 74b0b85 | 2010-10-27 05:43:53 +0000 | [diff] [blame] | 1102 | synchronize_net(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | t->parms.iph.saddr = p.iph.saddr; |
| 1104 | t->parms.iph.daddr = p.iph.daddr; |
| 1105 | t->parms.i_key = p.i_key; |
| 1106 | t->parms.o_key = p.o_key; |
| 1107 | memcpy(dev->dev_addr, &p.iph.saddr, 4); |
| 1108 | memcpy(dev->broadcast, &p.iph.daddr, 4); |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1109 | ipgre_tunnel_link(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | netdev_state_change(dev); |
| 1111 | } |
| 1112 | } |
| 1113 | |
| 1114 | if (t) { |
| 1115 | err = 0; |
| 1116 | if (cmd == SIOCCHGTUNNEL) { |
| 1117 | t->parms.iph.ttl = p.iph.ttl; |
| 1118 | t->parms.iph.tos = p.iph.tos; |
| 1119 | t->parms.iph.frag_off = p.iph.frag_off; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1120 | if (t->parms.link != p.link) { |
| 1121 | t->parms.link = p.link; |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 1122 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1123 | netdev_state_change(dev); |
| 1124 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | } |
| 1126 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
| 1127 | err = -EFAULT; |
| 1128 | } else |
| 1129 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
| 1130 | break; |
| 1131 | |
| 1132 | case SIOCDELTUNNEL: |
| 1133 | err = -EPERM; |
| 1134 | if (!capable(CAP_NET_ADMIN)) |
| 1135 | goto done; |
| 1136 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1137 | if (dev == ign->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | err = -EFAULT; |
| 1139 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 1140 | goto done; |
| 1141 | err = -ENOENT; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1142 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | goto done; |
| 1144 | err = -EPERM; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1145 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | goto done; |
| 1147 | dev = t->dev; |
| 1148 | } |
Stephen Hemminger | 22f8cde | 2007-02-07 00:09:58 -0800 | [diff] [blame] | 1149 | unregister_netdevice(dev); |
| 1150 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | break; |
| 1152 | |
| 1153 | default: |
| 1154 | err = -EINVAL; |
| 1155 | } |
| 1156 | |
| 1157 | done: |
| 1158 | return err; |
| 1159 | } |
| 1160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
| 1162 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1163 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 1164 | if (new_mtu < 68 || |
| 1165 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | return -EINVAL; |
| 1167 | dev->mtu = new_mtu; |
| 1168 | return 0; |
| 1169 | } |
| 1170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | /* Nice toy. Unfortunately, useless in real life :-) |
| 1172 | It allows to construct virtual multiprotocol broadcast "LAN" |
| 1173 | over the Internet, provided multicast routing is tuned. |
| 1174 | |
| 1175 | |
| 1176 | I have no idea was this bicycle invented before me, |
| 1177 | so that I had to set ARPHRD_IPGRE to a random value. |
| 1178 | I have an impression, that Cisco could make something similar, |
| 1179 | but this feature is apparently missing in IOS<=11.2(8). |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
| 1182 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) |
| 1183 | |
| 1184 | ping -t 255 224.66.66.66 |
| 1185 | |
| 1186 | If nobody answers, mbone does not work. |
| 1187 | |
| 1188 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 |
| 1189 | ip addr add 10.66.66.<somewhat>/24 dev Universe |
| 1190 | ifconfig Universe up |
| 1191 | ifconfig Universe add fe80::<Your_real_addr>/10 |
| 1192 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 |
| 1193 | ftp 10.66.66.66 |
| 1194 | ... |
| 1195 | ftp fec0:6666:6666::193.233.7.65 |
| 1196 | ... |
| 1197 | |
| 1198 | */ |
| 1199 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1200 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
| 1201 | unsigned short type, |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 1202 | const void *daddr, const void *saddr, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1204 | struct ip_tunnel *t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 1206 | __be16 *p = (__be16 *)(iph+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | |
| 1208 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
| 1209 | p[0] = t->parms.o_flags; |
| 1210 | p[1] = htons(type); |
| 1211 | |
| 1212 | /* |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1213 | * Set the source hardware address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | if (saddr) |
| 1217 | memcpy(&iph->saddr, saddr, 4); |
Timo Teräs | 6d55cb9 | 2010-03-03 04:01:13 +0000 | [diff] [blame] | 1218 | if (daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | memcpy(&iph->daddr, daddr, 4); |
Timo Teräs | 6d55cb9 | 2010-03-03 04:01:13 +0000 | [diff] [blame] | 1220 | if (iph->daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | return t->hlen; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1222 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | return -t->hlen; |
| 1224 | } |
| 1225 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1226 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
| 1227 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 1228 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1229 | memcpy(haddr, &iph->saddr, 4); |
| 1230 | return 4; |
| 1231 | } |
| 1232 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1233 | static const struct header_ops ipgre_header_ops = { |
| 1234 | .create = ipgre_header, |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1235 | .parse = ipgre_header_parse, |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1236 | }; |
| 1237 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1238 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | static int ipgre_open(struct net_device *dev) |
| 1240 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1241 | struct ip_tunnel *t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1243 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 1244 | struct flowi4 fl4; |
| 1245 | struct rtable *rt; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 1246 | |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 1247 | rt = ip_route_output_gre(dev_net(dev), &fl4, |
| 1248 | t->parms.iph.daddr, |
| 1249 | t->parms.iph.saddr, |
| 1250 | t->parms.o_key, |
| 1251 | RT_TOS(t->parms.iph.tos), |
| 1252 | t->parms.link); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1253 | if (IS_ERR(rt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | return -EADDRNOTAVAIL; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1255 | dev = rt->dst.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | ip_rt_put(rt); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1257 | if (__in_dev_get_rtnl(dev) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | return -EADDRNOTAVAIL; |
| 1259 | t->mlink = dev->ifindex; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1260 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | } |
| 1262 | return 0; |
| 1263 | } |
| 1264 | |
| 1265 | static int ipgre_close(struct net_device *dev) |
| 1266 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1267 | struct ip_tunnel *t = netdev_priv(dev); |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1268 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1269 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
Denis V. Lunev | 7fee0ca | 2008-01-21 17:32:38 -0800 | [diff] [blame] | 1270 | struct in_device *in_dev; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1271 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 1272 | if (in_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | } |
| 1275 | return 0; |
| 1276 | } |
| 1277 | |
| 1278 | #endif |
| 1279 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1280 | static const struct net_device_ops ipgre_netdev_ops = { |
| 1281 | .ndo_init = ipgre_tunnel_init, |
| 1282 | .ndo_uninit = ipgre_tunnel_uninit, |
| 1283 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
| 1284 | .ndo_open = ipgre_open, |
| 1285 | .ndo_stop = ipgre_close, |
| 1286 | #endif |
| 1287 | .ndo_start_xmit = ipgre_tunnel_xmit, |
| 1288 | .ndo_do_ioctl = ipgre_tunnel_ioctl, |
| 1289 | .ndo_change_mtu = ipgre_tunnel_change_mtu, |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 1290 | .ndo_get_stats64 = ipgre_get_stats64, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1291 | }; |
| 1292 | |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 1293 | static void ipgre_dev_free(struct net_device *dev) |
| 1294 | { |
| 1295 | free_percpu(dev->tstats); |
| 1296 | free_netdev(dev); |
| 1297 | } |
| 1298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | static void ipgre_tunnel_setup(struct net_device *dev) |
| 1300 | { |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1301 | dev->netdev_ops = &ipgre_netdev_ops; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 1302 | dev->destructor = ipgre_dev_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | |
| 1304 | dev->type = ARPHRD_IPGRE; |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 1305 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 1306 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | dev->flags = IFF_NOARP; |
| 1308 | dev->iflink = 0; |
| 1309 | dev->addr_len = 4; |
Pavel Emelyanov | 0b67ece | 2008-04-16 01:11:13 -0700 | [diff] [blame] | 1310 | dev->features |= NETIF_F_NETNS_LOCAL; |
Eric Dumazet | 108bfa8 | 2009-05-28 22:35:10 +0000 | [diff] [blame] | 1311 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | } |
| 1313 | |
| 1314 | static int ipgre_tunnel_init(struct net_device *dev) |
| 1315 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | struct ip_tunnel *tunnel; |
| 1317 | struct iphdr *iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1319 | tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | iph = &tunnel->parms.iph; |
| 1321 | |
| 1322 | tunnel->dev = dev; |
| 1323 | strcpy(tunnel->parms.name, dev->name); |
| 1324 | |
| 1325 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); |
| 1326 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); |
| 1327 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | if (iph->daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1330 | if (ipv4_is_multicast(iph->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | if (!iph->saddr) |
| 1332 | return -EINVAL; |
| 1333 | dev->flags = IFF_BROADCAST; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1334 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | } |
| 1336 | #endif |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1337 | } else |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1338 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 1340 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
| 1341 | if (!dev->tstats) |
| 1342 | return -ENOMEM; |
| 1343 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | return 0; |
| 1345 | } |
| 1346 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1347 | static void ipgre_fb_tunnel_init(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1349 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | struct iphdr *iph = &tunnel->parms.iph; |
| 1351 | |
| 1352 | tunnel->dev = dev; |
| 1353 | strcpy(tunnel->parms.name, dev->name); |
| 1354 | |
| 1355 | iph->version = 4; |
| 1356 | iph->protocol = IPPROTO_GRE; |
| 1357 | iph->ihl = 5; |
| 1358 | tunnel->hlen = sizeof(struct iphdr) + 4; |
| 1359 | |
| 1360 | dev_hold(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | } |
| 1362 | |
| 1363 | |
Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 1364 | static const struct gre_protocol ipgre_protocol = { |
| 1365 | .handler = ipgre_rcv, |
| 1366 | .err_handler = ipgre_err, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | }; |
| 1368 | |
Eric Dumazet | eef6dd6 | 2009-10-27 07:07:16 +0000 | [diff] [blame] | 1369 | static void ipgre_destroy_tunnels(struct ipgre_net *ign, struct list_head *head) |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1370 | { |
| 1371 | int prio; |
| 1372 | |
| 1373 | for (prio = 0; prio < 4; prio++) { |
| 1374 | int h; |
| 1375 | for (h = 0; h < HASH_SIZE; h++) { |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 1376 | struct ip_tunnel *t; |
| 1377 | |
| 1378 | t = rtnl_dereference(ign->tunnels[prio][h]); |
Eric Dumazet | eef6dd6 | 2009-10-27 07:07:16 +0000 | [diff] [blame] | 1379 | |
| 1380 | while (t != NULL) { |
| 1381 | unregister_netdevice_queue(t->dev, head); |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 1382 | t = rtnl_dereference(t->next); |
Eric Dumazet | eef6dd6 | 2009-10-27 07:07:16 +0000 | [diff] [blame] | 1383 | } |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1384 | } |
| 1385 | } |
| 1386 | } |
| 1387 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1388 | static int __net_init ipgre_init_net(struct net *net) |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1389 | { |
Eric W. Biederman | cfb8fbf | 2009-11-29 15:46:13 +0000 | [diff] [blame] | 1390 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1391 | int err; |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1392 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1393 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
| 1394 | ipgre_tunnel_setup); |
| 1395 | if (!ign->fb_tunnel_dev) { |
| 1396 | err = -ENOMEM; |
| 1397 | goto err_alloc_dev; |
| 1398 | } |
Alexey Dobriyan | be77e59 | 2008-11-23 17:26:26 -0800 | [diff] [blame] | 1399 | dev_net_set(ign->fb_tunnel_dev, net); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1400 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1401 | ipgre_fb_tunnel_init(ign->fb_tunnel_dev); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1402 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1403 | |
| 1404 | if ((err = register_netdev(ign->fb_tunnel_dev))) |
| 1405 | goto err_reg_dev; |
| 1406 | |
Eric Dumazet | 3285ee3 | 2010-10-30 16:21:28 -0700 | [diff] [blame] | 1407 | rcu_assign_pointer(ign->tunnels_wc[0], |
| 1408 | netdev_priv(ign->fb_tunnel_dev)); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1409 | return 0; |
| 1410 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1411 | err_reg_dev: |
Eric Dumazet | 3285ee3 | 2010-10-30 16:21:28 -0700 | [diff] [blame] | 1412 | ipgre_dev_free(ign->fb_tunnel_dev); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1413 | err_alloc_dev: |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1414 | return err; |
| 1415 | } |
| 1416 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1417 | static void __net_exit ipgre_exit_net(struct net *net) |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1418 | { |
| 1419 | struct ipgre_net *ign; |
Eric Dumazet | eef6dd6 | 2009-10-27 07:07:16 +0000 | [diff] [blame] | 1420 | LIST_HEAD(list); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1421 | |
| 1422 | ign = net_generic(net, ipgre_net_id); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1423 | rtnl_lock(); |
Eric Dumazet | eef6dd6 | 2009-10-27 07:07:16 +0000 | [diff] [blame] | 1424 | ipgre_destroy_tunnels(ign, &list); |
| 1425 | unregister_netdevice_many(&list); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1426 | rtnl_unlock(); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1427 | } |
| 1428 | |
| 1429 | static struct pernet_operations ipgre_net_ops = { |
| 1430 | .init = ipgre_init_net, |
| 1431 | .exit = ipgre_exit_net, |
Eric W. Biederman | cfb8fbf | 2009-11-29 15:46:13 +0000 | [diff] [blame] | 1432 | .id = &ipgre_net_id, |
| 1433 | .size = sizeof(struct ipgre_net), |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1434 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1436 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 1437 | { |
| 1438 | __be16 flags; |
| 1439 | |
| 1440 | if (!data) |
| 1441 | return 0; |
| 1442 | |
| 1443 | flags = 0; |
| 1444 | if (data[IFLA_GRE_IFLAGS]) |
| 1445 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 1446 | if (data[IFLA_GRE_OFLAGS]) |
| 1447 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 1448 | if (flags & (GRE_VERSION|GRE_ROUTING)) |
| 1449 | return -EINVAL; |
| 1450 | |
| 1451 | return 0; |
| 1452 | } |
| 1453 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1454 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 1455 | { |
| 1456 | __be32 daddr; |
| 1457 | |
| 1458 | if (tb[IFLA_ADDRESS]) { |
| 1459 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 1460 | return -EINVAL; |
| 1461 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 1462 | return -EADDRNOTAVAIL; |
| 1463 | } |
| 1464 | |
| 1465 | if (!data) |
| 1466 | goto out; |
| 1467 | |
| 1468 | if (data[IFLA_GRE_REMOTE]) { |
| 1469 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); |
| 1470 | if (!daddr) |
| 1471 | return -EINVAL; |
| 1472 | } |
| 1473 | |
| 1474 | out: |
| 1475 | return ipgre_tunnel_validate(tb, data); |
| 1476 | } |
| 1477 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1478 | static void ipgre_netlink_parms(struct nlattr *data[], |
| 1479 | struct ip_tunnel_parm *parms) |
| 1480 | { |
Herbert Xu | 7bb82d9 | 2008-10-11 12:20:15 -0700 | [diff] [blame] | 1481 | memset(parms, 0, sizeof(*parms)); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1482 | |
| 1483 | parms->iph.protocol = IPPROTO_GRE; |
| 1484 | |
| 1485 | if (!data) |
| 1486 | return; |
| 1487 | |
| 1488 | if (data[IFLA_GRE_LINK]) |
| 1489 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); |
| 1490 | |
| 1491 | if (data[IFLA_GRE_IFLAGS]) |
| 1492 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 1493 | |
| 1494 | if (data[IFLA_GRE_OFLAGS]) |
| 1495 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 1496 | |
| 1497 | if (data[IFLA_GRE_IKEY]) |
| 1498 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); |
| 1499 | |
| 1500 | if (data[IFLA_GRE_OKEY]) |
| 1501 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); |
| 1502 | |
| 1503 | if (data[IFLA_GRE_LOCAL]) |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1504 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1505 | |
| 1506 | if (data[IFLA_GRE_REMOTE]) |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1507 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1508 | |
| 1509 | if (data[IFLA_GRE_TTL]) |
| 1510 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); |
| 1511 | |
| 1512 | if (data[IFLA_GRE_TOS]) |
| 1513 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); |
| 1514 | |
| 1515 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) |
| 1516 | parms->iph.frag_off = htons(IP_DF); |
| 1517 | } |
| 1518 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1519 | static int ipgre_tap_init(struct net_device *dev) |
| 1520 | { |
| 1521 | struct ip_tunnel *tunnel; |
| 1522 | |
| 1523 | tunnel = netdev_priv(dev); |
| 1524 | |
| 1525 | tunnel->dev = dev; |
| 1526 | strcpy(tunnel->parms.name, dev->name); |
| 1527 | |
| 1528 | ipgre_tunnel_bind_dev(dev); |
| 1529 | |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 1530 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
| 1531 | if (!dev->tstats) |
| 1532 | return -ENOMEM; |
| 1533 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1534 | return 0; |
| 1535 | } |
| 1536 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1537 | static const struct net_device_ops ipgre_tap_netdev_ops = { |
| 1538 | .ndo_init = ipgre_tap_init, |
| 1539 | .ndo_uninit = ipgre_tunnel_uninit, |
| 1540 | .ndo_start_xmit = ipgre_tunnel_xmit, |
| 1541 | .ndo_set_mac_address = eth_mac_addr, |
| 1542 | .ndo_validate_addr = eth_validate_addr, |
| 1543 | .ndo_change_mtu = ipgre_tunnel_change_mtu, |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 1544 | .ndo_get_stats64 = ipgre_get_stats64, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1545 | }; |
| 1546 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1547 | static void ipgre_tap_setup(struct net_device *dev) |
| 1548 | { |
| 1549 | |
| 1550 | ether_setup(dev); |
| 1551 | |
Herbert Xu | 2e9526b | 2009-10-30 05:51:48 +0000 | [diff] [blame] | 1552 | dev->netdev_ops = &ipgre_tap_netdev_ops; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 1553 | dev->destructor = ipgre_dev_free; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1554 | |
| 1555 | dev->iflink = 0; |
| 1556 | dev->features |= NETIF_F_NETNS_LOCAL; |
| 1557 | } |
| 1558 | |
Eric W. Biederman | 81adee4 | 2009-11-08 00:53:51 -0800 | [diff] [blame] | 1559 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1560 | struct nlattr *data[]) |
| 1561 | { |
| 1562 | struct ip_tunnel *nt; |
| 1563 | struct net *net = dev_net(dev); |
| 1564 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 1565 | int mtu; |
| 1566 | int err; |
| 1567 | |
| 1568 | nt = netdev_priv(dev); |
| 1569 | ipgre_netlink_parms(data, &nt->parms); |
| 1570 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1571 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1572 | return -EEXIST; |
| 1573 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1574 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
Danny Kukawka | f2cedb6 | 2012-02-15 06:45:39 +0000 | [diff] [blame] | 1575 | eth_hw_addr_random(dev); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1576 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1577 | mtu = ipgre_tunnel_bind_dev(dev); |
| 1578 | if (!tb[IFLA_MTU]) |
| 1579 | dev->mtu = mtu; |
| 1580 | |
Eric Dumazet | b790e01 | 2010-09-27 23:05:47 +0000 | [diff] [blame] | 1581 | /* Can use a lockless transmit, unless we generate output sequences */ |
| 1582 | if (!(nt->parms.o_flags & GRE_SEQ)) |
| 1583 | dev->features |= NETIF_F_LLTX; |
| 1584 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1585 | err = register_netdevice(dev); |
| 1586 | if (err) |
| 1587 | goto out; |
| 1588 | |
| 1589 | dev_hold(dev); |
| 1590 | ipgre_tunnel_link(ign, nt); |
| 1591 | |
| 1592 | out: |
| 1593 | return err; |
| 1594 | } |
| 1595 | |
| 1596 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
| 1597 | struct nlattr *data[]) |
| 1598 | { |
| 1599 | struct ip_tunnel *t, *nt; |
| 1600 | struct net *net = dev_net(dev); |
| 1601 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 1602 | struct ip_tunnel_parm p; |
| 1603 | int mtu; |
| 1604 | |
| 1605 | if (dev == ign->fb_tunnel_dev) |
| 1606 | return -EINVAL; |
| 1607 | |
| 1608 | nt = netdev_priv(dev); |
| 1609 | ipgre_netlink_parms(data, &p); |
| 1610 | |
| 1611 | t = ipgre_tunnel_locate(net, &p, 0); |
| 1612 | |
| 1613 | if (t) { |
| 1614 | if (t->dev != dev) |
| 1615 | return -EEXIST; |
| 1616 | } else { |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1617 | t = nt; |
| 1618 | |
Herbert Xu | 2e9526b | 2009-10-30 05:51:48 +0000 | [diff] [blame] | 1619 | if (dev->type != ARPHRD_ETHER) { |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 1620 | unsigned int nflags = 0; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1621 | |
Herbert Xu | 2e9526b | 2009-10-30 05:51:48 +0000 | [diff] [blame] | 1622 | if (ipv4_is_multicast(p.iph.daddr)) |
| 1623 | nflags = IFF_BROADCAST; |
| 1624 | else if (p.iph.daddr) |
| 1625 | nflags = IFF_POINTOPOINT; |
| 1626 | |
| 1627 | if ((dev->flags ^ nflags) & |
| 1628 | (IFF_POINTOPOINT | IFF_BROADCAST)) |
| 1629 | return -EINVAL; |
| 1630 | } |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1631 | |
| 1632 | ipgre_tunnel_unlink(ign, t); |
| 1633 | t->parms.iph.saddr = p.iph.saddr; |
| 1634 | t->parms.iph.daddr = p.iph.daddr; |
| 1635 | t->parms.i_key = p.i_key; |
Herbert Xu | 2e9526b | 2009-10-30 05:51:48 +0000 | [diff] [blame] | 1636 | if (dev->type != ARPHRD_ETHER) { |
| 1637 | memcpy(dev->dev_addr, &p.iph.saddr, 4); |
| 1638 | memcpy(dev->broadcast, &p.iph.daddr, 4); |
| 1639 | } |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1640 | ipgre_tunnel_link(ign, t); |
| 1641 | netdev_state_change(dev); |
| 1642 | } |
| 1643 | |
| 1644 | t->parms.o_key = p.o_key; |
| 1645 | t->parms.iph.ttl = p.iph.ttl; |
| 1646 | t->parms.iph.tos = p.iph.tos; |
| 1647 | t->parms.iph.frag_off = p.iph.frag_off; |
| 1648 | |
| 1649 | if (t->parms.link != p.link) { |
| 1650 | t->parms.link = p.link; |
| 1651 | mtu = ipgre_tunnel_bind_dev(dev); |
| 1652 | if (!tb[IFLA_MTU]) |
| 1653 | dev->mtu = mtu; |
| 1654 | netdev_state_change(dev); |
| 1655 | } |
| 1656 | |
| 1657 | return 0; |
| 1658 | } |
| 1659 | |
| 1660 | static size_t ipgre_get_size(const struct net_device *dev) |
| 1661 | { |
| 1662 | return |
| 1663 | /* IFLA_GRE_LINK */ |
| 1664 | nla_total_size(4) + |
| 1665 | /* IFLA_GRE_IFLAGS */ |
| 1666 | nla_total_size(2) + |
| 1667 | /* IFLA_GRE_OFLAGS */ |
| 1668 | nla_total_size(2) + |
| 1669 | /* IFLA_GRE_IKEY */ |
| 1670 | nla_total_size(4) + |
| 1671 | /* IFLA_GRE_OKEY */ |
| 1672 | nla_total_size(4) + |
| 1673 | /* IFLA_GRE_LOCAL */ |
| 1674 | nla_total_size(4) + |
| 1675 | /* IFLA_GRE_REMOTE */ |
| 1676 | nla_total_size(4) + |
| 1677 | /* IFLA_GRE_TTL */ |
| 1678 | nla_total_size(1) + |
| 1679 | /* IFLA_GRE_TOS */ |
| 1680 | nla_total_size(1) + |
| 1681 | /* IFLA_GRE_PMTUDISC */ |
| 1682 | nla_total_size(1) + |
| 1683 | 0; |
| 1684 | } |
| 1685 | |
| 1686 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 1687 | { |
| 1688 | struct ip_tunnel *t = netdev_priv(dev); |
| 1689 | struct ip_tunnel_parm *p = &t->parms; |
| 1690 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1691 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
| 1692 | nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) || |
| 1693 | nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) || |
| 1694 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
| 1695 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || |
| 1696 | nla_put_be32(skb, IFLA_GRE_LOCAL, p->iph.saddr) || |
| 1697 | nla_put_be32(skb, IFLA_GRE_REMOTE, p->iph.daddr) || |
| 1698 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || |
| 1699 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || |
| 1700 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, |
| 1701 | !!(p->iph.frag_off & htons(IP_DF)))) |
| 1702 | goto nla_put_failure; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1703 | return 0; |
| 1704 | |
| 1705 | nla_put_failure: |
| 1706 | return -EMSGSIZE; |
| 1707 | } |
| 1708 | |
| 1709 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
| 1710 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, |
| 1711 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
| 1712 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
| 1713 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
| 1714 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1715 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
| 1716 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1717 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
| 1718 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, |
| 1719 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, |
| 1720 | }; |
| 1721 | |
| 1722 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { |
| 1723 | .kind = "gre", |
| 1724 | .maxtype = IFLA_GRE_MAX, |
| 1725 | .policy = ipgre_policy, |
| 1726 | .priv_size = sizeof(struct ip_tunnel), |
| 1727 | .setup = ipgre_tunnel_setup, |
| 1728 | .validate = ipgre_tunnel_validate, |
| 1729 | .newlink = ipgre_newlink, |
| 1730 | .changelink = ipgre_changelink, |
| 1731 | .get_size = ipgre_get_size, |
| 1732 | .fill_info = ipgre_fill_info, |
| 1733 | }; |
| 1734 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1735 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
| 1736 | .kind = "gretap", |
| 1737 | .maxtype = IFLA_GRE_MAX, |
| 1738 | .policy = ipgre_policy, |
| 1739 | .priv_size = sizeof(struct ip_tunnel), |
| 1740 | .setup = ipgre_tap_setup, |
| 1741 | .validate = ipgre_tap_validate, |
| 1742 | .newlink = ipgre_newlink, |
| 1743 | .changelink = ipgre_changelink, |
| 1744 | .get_size = ipgre_get_size, |
| 1745 | .fill_info = ipgre_fill_info, |
| 1746 | }; |
| 1747 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | /* |
| 1749 | * And now the modules code and kernel interface. |
| 1750 | */ |
| 1751 | |
| 1752 | static int __init ipgre_init(void) |
| 1753 | { |
| 1754 | int err; |
| 1755 | |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1756 | pr_info("GRE over IPv4 tunneling driver\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | |
Eric W. Biederman | cfb8fbf | 2009-11-29 15:46:13 +0000 | [diff] [blame] | 1758 | err = register_pernet_device(&ipgre_net_ops); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1759 | if (err < 0) |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1760 | return err; |
| 1761 | |
Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 1762 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1763 | if (err < 0) { |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1764 | pr_info("%s: can't add protocol\n", __func__); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1765 | goto add_proto_failed; |
| 1766 | } |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1767 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1768 | err = rtnl_link_register(&ipgre_link_ops); |
| 1769 | if (err < 0) |
| 1770 | goto rtnl_link_failed; |
| 1771 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1772 | err = rtnl_link_register(&ipgre_tap_ops); |
| 1773 | if (err < 0) |
| 1774 | goto tap_ops_failed; |
| 1775 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1776 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | return err; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1778 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1779 | tap_ops_failed: |
| 1780 | rtnl_link_unregister(&ipgre_link_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1781 | rtnl_link_failed: |
Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 1782 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1783 | add_proto_failed: |
| 1784 | unregister_pernet_device(&ipgre_net_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1785 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | } |
| 1787 | |
Alexey Kuznetsov | db44575 | 2005-07-30 17:46:44 -0700 | [diff] [blame] | 1788 | static void __exit ipgre_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1790 | rtnl_link_unregister(&ipgre_tap_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1791 | rtnl_link_unregister(&ipgre_link_ops); |
Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 1792 | if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0) |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1793 | pr_info("%s: can't remove protocol\n", __func__); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1794 | unregister_pernet_device(&ipgre_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | } |
| 1796 | |
| 1797 | module_init(ipgre_init); |
| 1798 | module_exit(ipgre_fini); |
| 1799 | MODULE_LICENSE("GPL"); |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1800 | MODULE_ALIAS_RTNL_LINK("gre"); |
| 1801 | MODULE_ALIAS_RTNL_LINK("gretap"); |
Vasiliy Kulikov | 8909c9a | 2011-03-02 00:33:13 +0300 | [diff] [blame] | 1802 | MODULE_ALIAS_NETDEV("gre0"); |