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 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 13 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 17 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <asm/uaccess.h> |
| 19 | #include <linux/skbuff.h> |
| 20 | #include <linux/netdevice.h> |
| 21 | #include <linux/in.h> |
| 22 | #include <linux/tcp.h> |
| 23 | #include <linux/udp.h> |
| 24 | #include <linux/if_arp.h> |
| 25 | #include <linux/mroute.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/in6.h> |
| 28 | #include <linux/inetdevice.h> |
| 29 | #include <linux/igmp.h> |
| 30 | #include <linux/netfilter_ipv4.h> |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 31 | #include <linux/etherdevice.h> |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 32 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | #include <net/sock.h> |
| 35 | #include <net/ip.h> |
| 36 | #include <net/icmp.h> |
| 37 | #include <net/protocol.h> |
| 38 | #include <net/ipip.h> |
| 39 | #include <net/arp.h> |
| 40 | #include <net/checksum.h> |
| 41 | #include <net/dsfield.h> |
| 42 | #include <net/inet_ecn.h> |
| 43 | #include <net/xfrm.h> |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 44 | #include <net/net_namespace.h> |
| 45 | #include <net/netns/generic.h> |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 46 | #include <net/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | #ifdef CONFIG_IPV6 |
| 49 | #include <net/ipv6.h> |
| 50 | #include <net/ip6_fib.h> |
| 51 | #include <net/ip6_route.h> |
| 52 | #endif |
| 53 | |
| 54 | /* |
| 55 | Problems & solutions |
| 56 | -------------------- |
| 57 | |
| 58 | 1. The most important issue is detecting local dead loops. |
| 59 | They would cause complete host lockup in transmit, which |
| 60 | would be "resolved" by stack overflow or, if queueing is enabled, |
| 61 | with infinite looping in net_bh. |
| 62 | |
| 63 | We cannot track such dead loops during route installation, |
| 64 | it is infeasible task. The most general solutions would be |
| 65 | to keep skb->encapsulation counter (sort of local ttl), |
| 66 | and silently drop packet when it expires. It is the best |
| 67 | solution, but it supposes maintaing new variable in ALL |
| 68 | skb, even if no tunneling is used. |
| 69 | |
Eric Dumazet | a43912a | 2009-09-23 10:28:33 +0000 | [diff] [blame] | 70 | Current solution: HARD_TX_LOCK lock breaks dead loops. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | |
| 73 | |
| 74 | 2. Networking dead loops would not kill routers, but would really |
| 75 | kill network. IP hop limit plays role of "t->recursion" in this case, |
| 76 | if we copy it from packet being encapsulated to upper header. |
| 77 | It is very good solution, but it introduces two problems: |
| 78 | |
| 79 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), |
| 80 | do not work over tunnels. |
| 81 | - traceroute does not work. I planned to relay ICMP from tunnel, |
| 82 | so that this problem would be solved and traceroute output |
| 83 | would even more informative. This idea appeared to be wrong: |
| 84 | only Linux complies to rfc1812 now (yes, guys, Linux is the only |
| 85 | true router now :-)), all routers (at least, in neighbourhood of mine) |
| 86 | return only 8 bytes of payload. It is the end. |
| 87 | |
| 88 | Hence, if we want that OSPF worked or traceroute said something reasonable, |
| 89 | we should search for another solution. |
| 90 | |
| 91 | One of them is to parse packet trying to detect inner encapsulation |
| 92 | made by our node. It is difficult or even impossible, especially, |
| 93 | taking into account fragmentation. TO be short, tt is not solution at all. |
| 94 | |
| 95 | Current solution: The solution was UNEXPECTEDLY SIMPLE. |
| 96 | We force DF flag on tunnels with preconfigured hop limit, |
| 97 | that is ALL. :-) Well, it does not remove the problem completely, |
| 98 | but exponential growth of network traffic is changed to linear |
| 99 | (branches, that exceed pmtu are pruned) and tunnel mtu |
| 100 | fastly degrades to value <68, where looping stops. |
| 101 | Yes, it is not good if there exists a router in the loop, |
| 102 | which does not force DF, even when encapsulating packets have DF set. |
| 103 | But it is not our problem! Nobody could accuse us, we made |
| 104 | all that we could make. Even if it is your gated who injected |
| 105 | fatal route to network, even if it were you who configured |
| 106 | fatal static route: you are innocent. :-) |
| 107 | |
| 108 | |
| 109 | |
| 110 | 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain |
| 111 | practically identical code. It would be good to glue them |
| 112 | together, but it is not very evident, how to make them modular. |
| 113 | sit is integral part of IPv6, ipip and gre are naturally modular. |
| 114 | We could extract common parts (hash table, ioctl etc) |
| 115 | to a separate module (ip_tunnel.c). |
| 116 | |
| 117 | Alexey Kuznetsov. |
| 118 | */ |
| 119 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 120 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | static int ipgre_tunnel_init(struct net_device *dev); |
| 122 | static void ipgre_tunnel_setup(struct net_device *dev); |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 123 | static int ipgre_tunnel_bind_dev(struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | /* Fallback tunnel: no source, no destination, no key, no options */ |
| 126 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 127 | #define HASH_SIZE 16 |
| 128 | |
Eric Dumazet | f99189b | 2009-11-17 10:42:49 +0000 | [diff] [blame] | 129 | static int ipgre_net_id __read_mostly; |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 130 | struct ipgre_net { |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 131 | struct ip_tunnel *tunnels[4][HASH_SIZE]; |
| 132 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 133 | struct net_device *fb_tunnel_dev; |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 134 | }; |
| 135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | /* Tunnel hash table */ |
| 137 | |
| 138 | /* |
| 139 | 4 hash tables: |
| 140 | |
| 141 | 3: (remote,local) |
| 142 | 2: (remote,*) |
| 143 | 1: (*,local) |
| 144 | 0: (*,*) |
| 145 | |
| 146 | We require exact key match i.e. if a key is present in packet |
| 147 | it will match only tunnel with the same key; if it is not present, |
| 148 | it will match only keyless tunnel. |
| 149 | |
| 150 | All keysless packets, if not matched configured keyless tunnels |
| 151 | will match fallback tunnel. |
| 152 | */ |
| 153 | |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 154 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 156 | #define tunnels_r_l tunnels[3] |
| 157 | #define tunnels_r tunnels[2] |
| 158 | #define tunnels_l tunnels[1] |
| 159 | #define tunnels_wc tunnels[0] |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 160 | /* |
| 161 | * Locking : hash tables are protected by RCU and a spinlock |
| 162 | */ |
| 163 | static DEFINE_SPINLOCK(ipgre_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 165 | #define for_each_ip_tunnel_rcu(start) \ |
| 166 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
| 168 | /* Given src, dst and key, find appropriate for input tunnel. */ |
| 169 | |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 170 | static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 171 | __be32 remote, __be32 local, |
| 172 | __be32 key, __be16 gre_proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 174 | struct net *net = dev_net(dev); |
| 175 | int link = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | unsigned h0 = HASH(remote); |
| 177 | unsigned h1 = HASH(key); |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 178 | struct ip_tunnel *t, *cand = NULL; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 179 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 180 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
| 181 | ARPHRD_ETHER : ARPHRD_IPGRE; |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 182 | int score, cand_score = 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 184 | for_each_ip_tunnel_rcu(ign->tunnels_r_l[h0 ^ h1]) { |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 185 | if (local != t->parms.iph.saddr || |
| 186 | remote != t->parms.iph.daddr || |
| 187 | key != t->parms.i_key || |
| 188 | !(t->dev->flags & IFF_UP)) |
| 189 | continue; |
| 190 | |
| 191 | if (t->dev->type != ARPHRD_IPGRE && |
| 192 | t->dev->type != dev_type) |
| 193 | continue; |
| 194 | |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 195 | score = 0; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 196 | if (t->parms.link != link) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 197 | score |= 1; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 198 | if (t->dev->type != dev_type) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 199 | score |= 2; |
| 200 | if (score == 0) |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 201 | return t; |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 202 | |
| 203 | if (score < cand_score) { |
| 204 | cand = t; |
| 205 | cand_score = score; |
| 206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 208 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 209 | for_each_ip_tunnel_rcu(ign->tunnels_r[h0 ^ h1]) { |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 210 | if (remote != t->parms.iph.daddr || |
| 211 | key != t->parms.i_key || |
| 212 | !(t->dev->flags & IFF_UP)) |
| 213 | continue; |
| 214 | |
| 215 | if (t->dev->type != ARPHRD_IPGRE && |
| 216 | t->dev->type != dev_type) |
| 217 | continue; |
| 218 | |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 219 | score = 0; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 220 | if (t->parms.link != link) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 221 | score |= 1; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 222 | if (t->dev->type != dev_type) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 223 | score |= 2; |
| 224 | if (score == 0) |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 225 | return t; |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 226 | |
| 227 | if (score < cand_score) { |
| 228 | cand = t; |
| 229 | cand_score = score; |
| 230 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 232 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 233 | for_each_ip_tunnel_rcu(ign->tunnels_l[h1]) { |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 234 | if ((local != t->parms.iph.saddr && |
| 235 | (local != t->parms.iph.daddr || |
| 236 | !ipv4_is_multicast(local))) || |
| 237 | key != t->parms.i_key || |
| 238 | !(t->dev->flags & IFF_UP)) |
| 239 | continue; |
| 240 | |
| 241 | if (t->dev->type != ARPHRD_IPGRE && |
| 242 | t->dev->type != dev_type) |
| 243 | continue; |
| 244 | |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 245 | score = 0; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 246 | if (t->parms.link != link) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 247 | score |= 1; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 248 | if (t->dev->type != dev_type) |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 249 | score |= 2; |
| 250 | if (score == 0) |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 251 | return t; |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 252 | |
| 253 | if (score < cand_score) { |
| 254 | cand = t; |
| 255 | cand_score = score; |
| 256 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 258 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 259 | for_each_ip_tunnel_rcu(ign->tunnels_wc[h1]) { |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 260 | if (t->parms.i_key != 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 | } |
| 281 | |
Timo Teras | afcf124 | 2009-01-26 20:56:10 -0800 | [diff] [blame] | 282 | if (cand != NULL) |
| 283 | return cand; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 284 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 285 | dev = ign->fb_tunnel_dev; |
| 286 | if (dev->flags & IFF_UP) |
| 287 | return netdev_priv(dev); |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | return NULL; |
| 290 | } |
| 291 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 292 | static struct ip_tunnel **__ipgre_bucket(struct ipgre_net *ign, |
| 293 | struct ip_tunnel_parm *parms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | { |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 295 | __be32 remote = parms->iph.daddr; |
| 296 | __be32 local = parms->iph.saddr; |
| 297 | __be32 key = parms->i_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | unsigned h = HASH(key); |
| 299 | int prio = 0; |
| 300 | |
| 301 | if (local) |
| 302 | prio |= 1; |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 303 | if (remote && !ipv4_is_multicast(remote)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | prio |= 2; |
| 305 | h ^= HASH(remote); |
| 306 | } |
| 307 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 308 | return &ign->tunnels[prio][h]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | } |
| 310 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 311 | static inline struct ip_tunnel **ipgre_bucket(struct ipgre_net *ign, |
| 312 | struct ip_tunnel *t) |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 313 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 314 | return __ipgre_bucket(ign, &t->parms); |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 315 | } |
| 316 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 317 | 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] | 318 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 319 | struct ip_tunnel **tp = ipgre_bucket(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 321 | spin_lock_bh(&ipgre_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | t->next = *tp; |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 323 | rcu_assign_pointer(*tp, t); |
| 324 | spin_unlock_bh(&ipgre_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
| 326 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 327 | 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] | 328 | { |
| 329 | struct ip_tunnel **tp; |
| 330 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 331 | for (tp = ipgre_bucket(ign, t); *tp; tp = &(*tp)->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | if (t == *tp) { |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 333 | spin_lock_bh(&ipgre_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | *tp = t->next; |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 335 | spin_unlock_bh(&ipgre_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | break; |
| 337 | } |
| 338 | } |
| 339 | } |
| 340 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 341 | static struct ip_tunnel *ipgre_tunnel_find(struct net *net, |
| 342 | struct ip_tunnel_parm *parms, |
| 343 | int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 345 | __be32 remote = parms->iph.daddr; |
| 346 | __be32 local = parms->iph.saddr; |
| 347 | __be32 key = parms->i_key; |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 348 | int link = parms->link; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 349 | struct ip_tunnel *t, **tp; |
| 350 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 351 | |
| 352 | for (tp = __ipgre_bucket(ign, parms); (t = *tp) != NULL; tp = &t->next) |
| 353 | if (local == t->parms.iph.saddr && |
| 354 | remote == t->parms.iph.daddr && |
| 355 | key == t->parms.i_key && |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 356 | link == t->parms.link && |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 357 | type == t->dev->type) |
| 358 | break; |
| 359 | |
| 360 | return t; |
| 361 | } |
| 362 | |
| 363 | static struct ip_tunnel * ipgre_tunnel_locate(struct net *net, |
| 364 | struct ip_tunnel_parm *parms, int create) |
| 365 | { |
| 366 | struct ip_tunnel *t, *nt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | char name[IFNAMSIZ]; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 369 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 371 | t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE); |
| 372 | if (t || !create) |
| 373 | return t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
| 375 | if (parms->name[0]) |
| 376 | strlcpy(name, parms->name, IFNAMSIZ); |
Pavel Emelyanov | 34cc7ba | 2008-02-23 20:19:20 -0800 | [diff] [blame] | 377 | else |
| 378 | sprintf(name, "gre%%d"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); |
| 381 | if (!dev) |
| 382 | return NULL; |
| 383 | |
Pavel Emelyanov | 0b67ece | 2008-04-16 01:11:13 -0700 | [diff] [blame] | 384 | dev_net_set(dev, net); |
| 385 | |
Pavel Emelyanov | b37d428b | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 386 | if (strchr(name, '%')) { |
| 387 | if (dev_alloc_name(dev, name) < 0) |
| 388 | goto failed_free; |
| 389 | } |
| 390 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 391 | nt = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | nt->parms = *parms; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 393 | dev->rtnl_link_ops = &ipgre_link_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 395 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
| 396 | |
Pavel Emelyanov | b37d428b | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 397 | if (register_netdevice(dev) < 0) |
| 398 | goto failed_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | dev_hold(dev); |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 401 | ipgre_tunnel_link(ign, nt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | return nt; |
| 403 | |
Pavel Emelyanov | b37d428b | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 404 | failed_free: |
| 405 | free_netdev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | return NULL; |
| 407 | } |
| 408 | |
| 409 | static void ipgre_tunnel_uninit(struct net_device *dev) |
| 410 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 411 | struct net *net = dev_net(dev); |
| 412 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 413 | |
| 414 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | dev_put(dev); |
| 416 | } |
| 417 | |
| 418 | |
| 419 | static void ipgre_err(struct sk_buff *skb, u32 info) |
| 420 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
Rami Rosen | 071f92d | 2008-05-21 17:47:54 -0700 | [diff] [blame] | 422 | /* All the routers (except for Linux) return only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | 8 bytes of packet payload. It means, that precise relaying of |
| 424 | ICMP in the real Internet is absolutely infeasible. |
| 425 | |
| 426 | Moreover, Cisco "wise men" put GRE key to the third word |
| 427 | in GRE header. It makes impossible maintaining even soft state for keyed |
| 428 | GRE tunnels with enabled checksum. Tell them "thank you". |
| 429 | |
| 430 | Well, I wonder, rfc1812 was written by Cisco employee, |
| 431 | what the hell these idiots break standrads established |
| 432 | by themself??? |
| 433 | */ |
| 434 | |
Jianjun Kong | 6ed2533e | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 435 | struct iphdr *iph = (struct iphdr *)skb->data; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 436 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | int grehlen = (iph->ihl<<2) + 4; |
Arnaldo Carvalho de Melo | 88c7664 | 2007-03-13 14:43:18 -0300 | [diff] [blame] | 438 | const int type = icmp_hdr(skb)->type; |
| 439 | const int code = icmp_hdr(skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | struct ip_tunnel *t; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 441 | __be16 flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
| 443 | flags = p[0]; |
| 444 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { |
| 445 | if (flags&(GRE_VERSION|GRE_ROUTING)) |
| 446 | return; |
| 447 | if (flags&GRE_KEY) { |
| 448 | grehlen += 4; |
| 449 | if (flags&GRE_CSUM) |
| 450 | grehlen += 4; |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | /* If only 8 bytes returned, keyed message will be dropped here */ |
| 455 | if (skb_headlen(skb) < grehlen) |
| 456 | return; |
| 457 | |
| 458 | switch (type) { |
| 459 | default: |
| 460 | case ICMP_PARAMETERPROB: |
| 461 | return; |
| 462 | |
| 463 | case ICMP_DEST_UNREACH: |
| 464 | switch (code) { |
| 465 | case ICMP_SR_FAILED: |
| 466 | case ICMP_PORT_UNREACH: |
| 467 | /* Impossible event. */ |
| 468 | return; |
| 469 | case ICMP_FRAG_NEEDED: |
| 470 | /* Soft state for pmtu is maintained by IP core. */ |
| 471 | return; |
| 472 | default: |
| 473 | /* All others are translated to HOST_UNREACH. |
| 474 | rfc2003 contains "deep thoughts" about NET_UNREACH, |
| 475 | I believe they are just ether pollution. --ANK |
| 476 | */ |
| 477 | break; |
| 478 | } |
| 479 | break; |
| 480 | case ICMP_TIME_EXCEEDED: |
| 481 | if (code != ICMP_EXC_TTL) |
| 482 | return; |
| 483 | break; |
| 484 | } |
| 485 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 486 | rcu_read_lock(); |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 487 | t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 488 | flags & GRE_KEY ? |
| 489 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, |
| 490 | p[1]); |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 491 | if (t == NULL || t->parms.iph.daddr == 0 || |
| 492 | ipv4_is_multicast(t->parms.iph.daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | goto out; |
| 494 | |
| 495 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
| 496 | goto out; |
| 497 | |
Wei Yongjun | da6185d8 | 2009-02-24 23:34:48 -0800 | [diff] [blame] | 498 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | t->err_count++; |
| 500 | else |
| 501 | t->err_count = 1; |
| 502 | t->err_time = jiffies; |
| 503 | out: |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 504 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
| 506 | |
| 507 | static inline void ipgre_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) |
| 508 | { |
| 509 | if (INET_ECN_is_ce(iph->tos)) { |
| 510 | if (skb->protocol == htons(ETH_P_IP)) { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 511 | IP_ECN_set_ce(ip_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 513 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | } |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | static inline u8 |
| 519 | ipgre_ecn_encapsulate(u8 tos, struct iphdr *old_iph, struct sk_buff *skb) |
| 520 | { |
| 521 | u8 inner = 0; |
| 522 | if (skb->protocol == htons(ETH_P_IP)) |
| 523 | inner = old_iph->tos; |
| 524 | else if (skb->protocol == htons(ETH_P_IPV6)) |
| 525 | inner = ipv6_get_dsfield((struct ipv6hdr *)old_iph); |
| 526 | return INET_ECN_encapsulate(tos, inner); |
| 527 | } |
| 528 | |
| 529 | static int ipgre_rcv(struct sk_buff *skb) |
| 530 | { |
| 531 | struct iphdr *iph; |
| 532 | u8 *h; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 533 | __be16 flags; |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 534 | __sum16 csum = 0; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 535 | __be32 key = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | u32 seqno = 0; |
| 537 | struct ip_tunnel *tunnel; |
| 538 | int offset = 4; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 539 | __be16 gre_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
| 541 | if (!pskb_may_pull(skb, 16)) |
| 542 | goto drop_nolock; |
| 543 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 544 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | h = skb->data; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 546 | flags = *(__be16*)h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | |
| 548 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { |
| 549 | /* - Version must be 0. |
| 550 | - We do not support routing headers. |
| 551 | */ |
| 552 | if (flags&(GRE_VERSION|GRE_ROUTING)) |
| 553 | goto drop_nolock; |
| 554 | |
| 555 | if (flags&GRE_CSUM) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 556 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 557 | case CHECKSUM_COMPLETE: |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 558 | csum = csum_fold(skb->csum); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 559 | if (!csum) |
| 560 | break; |
| 561 | /* fall through */ |
| 562 | case CHECKSUM_NONE: |
| 563 | skb->csum = 0; |
| 564 | csum = __skb_checksum_complete(skb); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 565 | skb->ip_summed = CHECKSUM_COMPLETE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | } |
| 567 | offset += 4; |
| 568 | } |
| 569 | if (flags&GRE_KEY) { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 570 | key = *(__be32*)(h + offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | offset += 4; |
| 572 | } |
| 573 | if (flags&GRE_SEQ) { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 574 | seqno = ntohl(*(__be32*)(h + offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | offset += 4; |
| 576 | } |
| 577 | } |
| 578 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 579 | gre_proto = *(__be16 *)(h + 2); |
| 580 | |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 581 | rcu_read_lock(); |
Timo Teras | 749c10f | 2009-01-19 17:22:12 -0800 | [diff] [blame] | 582 | if ((tunnel = ipgre_tunnel_lookup(skb->dev, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 583 | iph->saddr, iph->daddr, key, |
| 584 | gre_proto))) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 585 | struct net_device_stats *stats = &tunnel->dev->stats; |
| 586 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | secpath_reset(skb); |
| 588 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 589 | skb->protocol = gre_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | /* WCCP version 1 and 2 protocol decoding. |
| 591 | * - Change protocol to IP |
| 592 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header |
| 593 | */ |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 594 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
YOSHIFUJI Hideaki | 496c98d | 2006-10-10 19:41:21 -0700 | [diff] [blame] | 595 | skb->protocol = htons(ETH_P_IP); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 596 | if ((*(h + offset) & 0xF0) != 0x40) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | offset += 4; |
| 598 | } |
| 599 | |
Timo Teras | 1d06916 | 2007-12-20 00:10:33 -0800 | [diff] [blame] | 600 | skb->mac_header = skb->network_header; |
Arnaldo Carvalho de Melo | 4209fb6 | 2007-03-10 18:42:03 -0300 | [diff] [blame] | 601 | __pskb_pull(skb, offset); |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 602 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | skb->pkt_type = PACKET_HOST; |
| 604 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 605 | if (ipv4_is_multicast(iph->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | /* Looped back packet, drop it! */ |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 607 | if (skb_rtable(skb)->fl.iif == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | goto drop; |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 609 | stats->multicast++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | skb->pkt_type = PACKET_BROADCAST; |
| 611 | } |
| 612 | #endif |
| 613 | |
| 614 | if (((flags&GRE_CSUM) && csum) || |
| 615 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 616 | stats->rx_crc_errors++; |
| 617 | stats->rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | goto drop; |
| 619 | } |
| 620 | if (tunnel->parms.i_flags&GRE_SEQ) { |
| 621 | if (!(flags&GRE_SEQ) || |
| 622 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 623 | stats->rx_fifo_errors++; |
| 624 | stats->rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | goto drop; |
| 626 | } |
| 627 | tunnel->i_seqno = seqno + 1; |
| 628 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 629 | |
| 630 | /* Warning: All skb pointers will be invalidated! */ |
| 631 | if (tunnel->dev->type == ARPHRD_ETHER) { |
| 632 | if (!pskb_may_pull(skb, ETH_HLEN)) { |
| 633 | stats->rx_length_errors++; |
| 634 | stats->rx_errors++; |
| 635 | goto drop; |
| 636 | } |
| 637 | |
| 638 | iph = ip_hdr(skb); |
| 639 | skb->protocol = eth_type_trans(skb, tunnel->dev); |
| 640 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| 641 | } |
| 642 | |
Eric Dumazet | d19d56d | 2010-05-17 22:36:55 -0700 | [diff] [blame] | 643 | skb_tunnel_rx(skb, tunnel->dev); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 644 | |
| 645 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | ipgre_ecn_decapsulate(iph, skb); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | netif_rx(skb); |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 649 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | return(0); |
| 651 | } |
Herbert Xu | 45af08b | 2006-04-05 22:31:19 -0700 | [diff] [blame] | 652 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | |
| 654 | drop: |
Eric Dumazet | 8d5b2c0 | 2009-10-23 06:14:38 +0000 | [diff] [blame] | 655 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | drop_nolock: |
| 657 | kfree_skb(skb); |
| 658 | return(0); |
| 659 | } |
| 660 | |
Stephen Hemminger | 6fef4c0 | 2009-08-31 19:50:41 +0000 | [diff] [blame] | 661 | 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] | 662 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 663 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Eric Dumazet | 0bfbedb | 2009-10-05 00:11:22 -0700 | [diff] [blame] | 664 | struct net_device_stats *stats = &dev->stats; |
| 665 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 666 | struct iphdr *old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | struct iphdr *tiph; |
| 668 | u8 tos; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 669 | __be16 df; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | struct rtable *rt; /* Route to the other host */ |
| 671 | struct net_device *tdev; /* Device to other host */ |
| 672 | struct iphdr *iph; /* Our new IP header */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 673 | unsigned int max_headroom; /* The extra header space needed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | int gre_hlen; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 675 | __be32 dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | int mtu; |
| 677 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 678 | if (dev->type == ARPHRD_ETHER) |
| 679 | IPCB(skb)->flags = 0; |
| 680 | |
| 681 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | gre_hlen = 0; |
Jianjun Kong | 6ed2533e | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 683 | tiph = (struct iphdr *)skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | } else { |
| 685 | gre_hlen = tunnel->hlen; |
| 686 | tiph = &tunnel->parms.iph; |
| 687 | } |
| 688 | |
| 689 | if ((dst = tiph->daddr) == 0) { |
| 690 | /* NBMA tunnel */ |
| 691 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 692 | if (skb_dst(skb) == NULL) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 693 | stats->tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | goto tx_error; |
| 695 | } |
| 696 | |
| 697 | if (skb->protocol == htons(ETH_P_IP)) { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 698 | rt = skb_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | if ((dst = rt->rt_gateway) == 0) |
| 700 | goto tx_error_icmp; |
| 701 | } |
| 702 | #ifdef CONFIG_IPV6 |
| 703 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
| 704 | struct in6_addr *addr6; |
| 705 | int addr_type; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 706 | struct neighbour *neigh = skb_dst(skb)->neighbour; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
| 708 | if (neigh == NULL) |
| 709 | goto tx_error; |
| 710 | |
Jianjun Kong | 6ed2533e | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 711 | addr6 = (struct in6_addr *)&neigh->primary_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | addr_type = ipv6_addr_type(addr6); |
| 713 | |
| 714 | if (addr_type == IPV6_ADDR_ANY) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 715 | addr6 = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | addr_type = ipv6_addr_type(addr6); |
| 717 | } |
| 718 | |
| 719 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) |
| 720 | goto tx_error_icmp; |
| 721 | |
| 722 | dst = addr6->s6_addr32[3]; |
| 723 | } |
| 724 | #endif |
| 725 | else |
| 726 | goto tx_error; |
| 727 | } |
| 728 | |
| 729 | tos = tiph->tos; |
Andreas Jaggi | ee686ca | 2009-07-14 09:35:59 -0700 | [diff] [blame] | 730 | if (tos == 1) { |
| 731 | tos = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | if (skb->protocol == htons(ETH_P_IP)) |
| 733 | tos = old_iph->tos; |
Stephen Hemminger | dd4ba83 | 2010-07-08 21:35:58 -0700 | [diff] [blame] | 734 | else if (skb->protocol == htons(ETH_P_IPV6)) |
| 735 | tos = ipv6_get_dsfield((struct ipv6hdr *)old_iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | } |
| 737 | |
| 738 | { |
| 739 | struct flowi fl = { .oif = tunnel->parms.link, |
| 740 | .nl_u = { .ip4_u = |
| 741 | { .daddr = dst, |
| 742 | .saddr = tiph->saddr, |
| 743 | .tos = RT_TOS(tos) } }, |
| 744 | .proto = IPPROTO_GRE }; |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 745 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 746 | stats->tx_carrier_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | goto tx_error; |
| 748 | } |
| 749 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 750 | tdev = rt->dst.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
| 752 | if (tdev == dev) { |
| 753 | ip_rt_put(rt); |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 754 | stats->collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | goto tx_error; |
| 756 | } |
| 757 | |
| 758 | df = tiph->frag_off; |
| 759 | if (df) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 760 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - tunnel->hlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | else |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 762 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 764 | if (skb_dst(skb)) |
| 765 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
| 767 | if (skb->protocol == htons(ETH_P_IP)) { |
| 768 | df |= (old_iph->frag_off&htons(IP_DF)); |
| 769 | |
| 770 | if ((old_iph->frag_off&htons(IP_DF)) && |
| 771 | mtu < ntohs(old_iph->tot_len)) { |
| 772 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
| 773 | ip_rt_put(rt); |
| 774 | goto tx_error; |
| 775 | } |
| 776 | } |
| 777 | #ifdef CONFIG_IPV6 |
| 778 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 779 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 781 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) { |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 782 | if ((tunnel->parms.iph.daddr && |
| 783 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | rt6->rt6i_dst.plen == 128) { |
| 785 | rt6->rt6i_flags |= RTF_MODIFIED; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 786 | skb_dst(skb)->metrics[RTAX_MTU-1] = mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | } |
| 788 | } |
| 789 | |
| 790 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 791 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | ip_rt_put(rt); |
| 793 | goto tx_error; |
| 794 | } |
| 795 | } |
| 796 | #endif |
| 797 | |
| 798 | if (tunnel->err_count > 0) { |
Wei Yongjun | da6185d8 | 2009-02-24 23:34:48 -0800 | [diff] [blame] | 799 | if (time_before(jiffies, |
| 800 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | tunnel->err_count--; |
| 802 | |
| 803 | dst_link_failure(skb); |
| 804 | } else |
| 805 | tunnel->err_count = 0; |
| 806 | } |
| 807 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 808 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
Patrick McHardy | cfbba49 | 2007-07-09 15:33:40 -0700 | [diff] [blame] | 810 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
| 811 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
Timo Teräs | 243aad8 | 2010-03-20 02:27:58 +0000 | [diff] [blame] | 813 | if (max_headroom > dev->needed_headroom) |
| 814 | dev->needed_headroom = max_headroom; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | if (!new_skb) { |
| 816 | ip_rt_put(rt); |
Eric Dumazet | 0bfbedb | 2009-10-05 00:11:22 -0700 | [diff] [blame] | 817 | txq->tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 819 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | } |
| 821 | if (skb->sk) |
| 822 | skb_set_owner_w(new_skb, skb->sk); |
| 823 | dev_kfree_skb(skb); |
| 824 | skb = new_skb; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 825 | old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | } |
| 827 | |
Herbert Xu | 64194c3 | 2008-10-09 12:03:17 -0700 | [diff] [blame] | 828 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 829 | skb_push(skb, gre_hlen); |
| 830 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
Patrick McHardy | 48d5cad | 2006-02-15 15:10:22 -0800 | [diff] [blame] | 832 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
| 833 | IPSKB_REROUTED); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 834 | skb_dst_drop(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 835 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
| 837 | /* |
| 838 | * Push down and install the IPIP header. |
| 839 | */ |
| 840 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 841 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | iph->version = 4; |
| 843 | iph->ihl = sizeof(struct iphdr) >> 2; |
| 844 | iph->frag_off = df; |
| 845 | iph->protocol = IPPROTO_GRE; |
| 846 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); |
| 847 | iph->daddr = rt->rt_dst; |
| 848 | iph->saddr = rt->rt_src; |
| 849 | |
| 850 | if ((iph->ttl = tiph->ttl) == 0) { |
| 851 | if (skb->protocol == htons(ETH_P_IP)) |
| 852 | iph->ttl = old_iph->ttl; |
| 853 | #ifdef CONFIG_IPV6 |
| 854 | else if (skb->protocol == htons(ETH_P_IPV6)) |
Jianjun Kong | 6ed2533e | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 855 | iph->ttl = ((struct ipv6hdr *)old_iph)->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | #endif |
| 857 | else |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 858 | iph->ttl = dst_metric(&rt->dst, RTAX_HOPLIMIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |
| 860 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 861 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
| 862 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? |
| 863 | htons(ETH_P_TEB) : skb->protocol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | |
| 865 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 866 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
| 868 | if (tunnel->parms.o_flags&GRE_SEQ) { |
| 869 | ++tunnel->o_seqno; |
| 870 | *ptr = htonl(tunnel->o_seqno); |
| 871 | ptr--; |
| 872 | } |
| 873 | if (tunnel->parms.o_flags&GRE_KEY) { |
| 874 | *ptr = tunnel->parms.o_key; |
| 875 | ptr--; |
| 876 | } |
| 877 | if (tunnel->parms.o_flags&GRE_CSUM) { |
| 878 | *ptr = 0; |
Al Viro | 5f92a73 | 2006-11-14 21:36:54 -0800 | [diff] [blame] | 879 | *(__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] | 880 | } |
| 881 | } |
| 882 | |
| 883 | nf_reset(skb); |
| 884 | |
| 885 | IPTUNNEL_XMIT(); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 886 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
| 888 | tx_error_icmp: |
| 889 | dst_link_failure(skb); |
| 890 | |
| 891 | tx_error: |
| 892 | stats->tx_errors++; |
| 893 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 894 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | } |
| 896 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 897 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 898 | { |
| 899 | struct net_device *tdev = NULL; |
| 900 | struct ip_tunnel *tunnel; |
| 901 | struct iphdr *iph; |
| 902 | int hlen = LL_MAX_HEADER; |
| 903 | int mtu = ETH_DATA_LEN; |
| 904 | int addend = sizeof(struct iphdr) + 4; |
| 905 | |
| 906 | tunnel = netdev_priv(dev); |
| 907 | iph = &tunnel->parms.iph; |
| 908 | |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 909 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 910 | |
| 911 | if (iph->daddr) { |
| 912 | struct flowi fl = { .oif = tunnel->parms.link, |
| 913 | .nl_u = { .ip4_u = |
| 914 | { .daddr = iph->daddr, |
| 915 | .saddr = iph->saddr, |
| 916 | .tos = RT_TOS(iph->tos) } }, |
| 917 | .proto = IPPROTO_GRE }; |
| 918 | struct rtable *rt; |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 919 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 920 | tdev = rt->dst.dev; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 921 | ip_rt_put(rt); |
| 922 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 923 | |
| 924 | if (dev->type != ARPHRD_ETHER) |
| 925 | dev->flags |= IFF_POINTOPOINT; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 926 | } |
| 927 | |
| 928 | if (!tdev && tunnel->parms.link) |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 929 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 930 | |
| 931 | if (tdev) { |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 932 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 933 | mtu = tdev->mtu; |
| 934 | } |
| 935 | dev->iflink = tunnel->parms.link; |
| 936 | |
| 937 | /* Precalculate GRE options length */ |
| 938 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { |
| 939 | if (tunnel->parms.o_flags&GRE_CSUM) |
| 940 | addend += 4; |
| 941 | if (tunnel->parms.o_flags&GRE_KEY) |
| 942 | addend += 4; |
| 943 | if (tunnel->parms.o_flags&GRE_SEQ) |
| 944 | addend += 4; |
| 945 | } |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 946 | dev->needed_headroom = addend + hlen; |
Tom Goff | 8cdb045 | 2009-08-14 16:33:56 -0700 | [diff] [blame] | 947 | mtu -= dev->hard_header_len + addend; |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 948 | |
| 949 | if (mtu < 68) |
| 950 | mtu = 68; |
| 951 | |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 952 | tunnel->hlen = addend; |
| 953 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 954 | return mtu; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 955 | } |
| 956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | static int |
| 958 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) |
| 959 | { |
| 960 | int err = 0; |
| 961 | struct ip_tunnel_parm p; |
| 962 | struct ip_tunnel *t; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 963 | struct net *net = dev_net(dev); |
| 964 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | |
| 966 | switch (cmd) { |
| 967 | case SIOCGETTUNNEL: |
| 968 | t = NULL; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 969 | if (dev == ign->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| 971 | err = -EFAULT; |
| 972 | break; |
| 973 | } |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 974 | t = ipgre_tunnel_locate(net, &p, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | } |
| 976 | if (t == NULL) |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 977 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | memcpy(&p, &t->parms, sizeof(p)); |
| 979 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 980 | err = -EFAULT; |
| 981 | break; |
| 982 | |
| 983 | case SIOCADDTUNNEL: |
| 984 | case SIOCCHGTUNNEL: |
| 985 | err = -EPERM; |
| 986 | if (!capable(CAP_NET_ADMIN)) |
| 987 | goto done; |
| 988 | |
| 989 | err = -EFAULT; |
| 990 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 991 | goto done; |
| 992 | |
| 993 | err = -EINVAL; |
| 994 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || |
| 995 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || |
| 996 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) |
| 997 | goto done; |
| 998 | if (p.iph.ttl) |
| 999 | p.iph.frag_off |= htons(IP_DF); |
| 1000 | |
| 1001 | if (!(p.i_flags&GRE_KEY)) |
| 1002 | p.i_key = 0; |
| 1003 | if (!(p.o_flags&GRE_KEY)) |
| 1004 | p.o_key = 0; |
| 1005 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1006 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1008 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | if (t != NULL) { |
| 1010 | if (t->dev != dev) { |
| 1011 | err = -EEXIST; |
| 1012 | break; |
| 1013 | } |
| 1014 | } else { |
Jianjun Kong | 6ed2533e | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 1015 | unsigned nflags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1017 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1019 | if (ipv4_is_multicast(p.iph.daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | nflags = IFF_BROADCAST; |
| 1021 | else if (p.iph.daddr) |
| 1022 | nflags = IFF_POINTOPOINT; |
| 1023 | |
| 1024 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { |
| 1025 | err = -EINVAL; |
| 1026 | break; |
| 1027 | } |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1028 | ipgre_tunnel_unlink(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | t->parms.iph.saddr = p.iph.saddr; |
| 1030 | t->parms.iph.daddr = p.iph.daddr; |
| 1031 | t->parms.i_key = p.i_key; |
| 1032 | t->parms.o_key = p.o_key; |
| 1033 | memcpy(dev->dev_addr, &p.iph.saddr, 4); |
| 1034 | memcpy(dev->broadcast, &p.iph.daddr, 4); |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1035 | ipgre_tunnel_link(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | netdev_state_change(dev); |
| 1037 | } |
| 1038 | } |
| 1039 | |
| 1040 | if (t) { |
| 1041 | err = 0; |
| 1042 | if (cmd == SIOCCHGTUNNEL) { |
| 1043 | t->parms.iph.ttl = p.iph.ttl; |
| 1044 | t->parms.iph.tos = p.iph.tos; |
| 1045 | t->parms.iph.frag_off = p.iph.frag_off; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1046 | if (t->parms.link != p.link) { |
| 1047 | t->parms.link = p.link; |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 1048 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1049 | netdev_state_change(dev); |
| 1050 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | } |
| 1052 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
| 1053 | err = -EFAULT; |
| 1054 | } else |
| 1055 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
| 1056 | break; |
| 1057 | |
| 1058 | case SIOCDELTUNNEL: |
| 1059 | err = -EPERM; |
| 1060 | if (!capable(CAP_NET_ADMIN)) |
| 1061 | goto done; |
| 1062 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1063 | if (dev == ign->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | err = -EFAULT; |
| 1065 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 1066 | goto done; |
| 1067 | err = -ENOENT; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1068 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | goto done; |
| 1070 | err = -EPERM; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1071 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | goto done; |
| 1073 | dev = t->dev; |
| 1074 | } |
Stephen Hemminger | 22f8cde | 2007-02-07 00:09:58 -0800 | [diff] [blame] | 1075 | unregister_netdevice(dev); |
| 1076 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | break; |
| 1078 | |
| 1079 | default: |
| 1080 | err = -EINVAL; |
| 1081 | } |
| 1082 | |
| 1083 | done: |
| 1084 | return err; |
| 1085 | } |
| 1086 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
| 1088 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1089 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 1090 | if (new_mtu < 68 || |
| 1091 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | return -EINVAL; |
| 1093 | dev->mtu = new_mtu; |
| 1094 | return 0; |
| 1095 | } |
| 1096 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | /* Nice toy. Unfortunately, useless in real life :-) |
| 1098 | It allows to construct virtual multiprotocol broadcast "LAN" |
| 1099 | over the Internet, provided multicast routing is tuned. |
| 1100 | |
| 1101 | |
| 1102 | I have no idea was this bicycle invented before me, |
| 1103 | so that I had to set ARPHRD_IPGRE to a random value. |
| 1104 | I have an impression, that Cisco could make something similar, |
| 1105 | but this feature is apparently missing in IOS<=11.2(8). |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
| 1108 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) |
| 1109 | |
| 1110 | ping -t 255 224.66.66.66 |
| 1111 | |
| 1112 | If nobody answers, mbone does not work. |
| 1113 | |
| 1114 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 |
| 1115 | ip addr add 10.66.66.<somewhat>/24 dev Universe |
| 1116 | ifconfig Universe up |
| 1117 | ifconfig Universe add fe80::<Your_real_addr>/10 |
| 1118 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 |
| 1119 | ftp 10.66.66.66 |
| 1120 | ... |
| 1121 | ftp fec0:6666:6666::193.233.7.65 |
| 1122 | ... |
| 1123 | |
| 1124 | */ |
| 1125 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1126 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
| 1127 | unsigned short type, |
| 1128 | const void *daddr, const void *saddr, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1130 | struct ip_tunnel *t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 1132 | __be16 *p = (__be16*)(iph+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | |
| 1134 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
| 1135 | p[0] = t->parms.o_flags; |
| 1136 | p[1] = htons(type); |
| 1137 | |
| 1138 | /* |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1139 | * Set the source hardware address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | if (saddr) |
| 1143 | memcpy(&iph->saddr, saddr, 4); |
Timo Teräs | 6d55cb9 | 2010-03-03 04:01:13 +0000 | [diff] [blame] | 1144 | if (daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | memcpy(&iph->daddr, daddr, 4); |
Timo Teräs | 6d55cb9 | 2010-03-03 04:01:13 +0000 | [diff] [blame] | 1146 | if (iph->daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | return t->hlen; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | return -t->hlen; |
| 1150 | } |
| 1151 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1152 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
| 1153 | { |
Jianjun Kong | 6ed2533e | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 1154 | struct iphdr *iph = (struct iphdr *) skb_mac_header(skb); |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1155 | memcpy(haddr, &iph->saddr, 4); |
| 1156 | return 4; |
| 1157 | } |
| 1158 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1159 | static const struct header_ops ipgre_header_ops = { |
| 1160 | .create = ipgre_header, |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1161 | .parse = ipgre_header_parse, |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1162 | }; |
| 1163 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1164 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | static int ipgre_open(struct net_device *dev) |
| 1166 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1167 | struct ip_tunnel *t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1169 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | struct flowi fl = { .oif = t->parms.link, |
| 1171 | .nl_u = { .ip4_u = |
| 1172 | { .daddr = t->parms.iph.daddr, |
| 1173 | .saddr = t->parms.iph.saddr, |
| 1174 | .tos = RT_TOS(t->parms.iph.tos) } }, |
| 1175 | .proto = IPPROTO_GRE }; |
| 1176 | struct rtable *rt; |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 1177 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | return -EADDRNOTAVAIL; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1179 | dev = rt->dst.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | ip_rt_put(rt); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1181 | if (__in_dev_get_rtnl(dev) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | return -EADDRNOTAVAIL; |
| 1183 | t->mlink = dev->ifindex; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1184 | 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] | 1185 | } |
| 1186 | return 0; |
| 1187 | } |
| 1188 | |
| 1189 | static int ipgre_close(struct net_device *dev) |
| 1190 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1191 | struct ip_tunnel *t = netdev_priv(dev); |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1192 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1193 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
Denis V. Lunev | 7fee0ca | 2008-01-21 17:32:38 -0800 | [diff] [blame] | 1194 | struct in_device *in_dev; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1195 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | if (in_dev) { |
| 1197 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
| 1198 | in_dev_put(in_dev); |
| 1199 | } |
| 1200 | } |
| 1201 | return 0; |
| 1202 | } |
| 1203 | |
| 1204 | #endif |
| 1205 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1206 | static const struct net_device_ops ipgre_netdev_ops = { |
| 1207 | .ndo_init = ipgre_tunnel_init, |
| 1208 | .ndo_uninit = ipgre_tunnel_uninit, |
| 1209 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
| 1210 | .ndo_open = ipgre_open, |
| 1211 | .ndo_stop = ipgre_close, |
| 1212 | #endif |
| 1213 | .ndo_start_xmit = ipgre_tunnel_xmit, |
| 1214 | .ndo_do_ioctl = ipgre_tunnel_ioctl, |
| 1215 | .ndo_change_mtu = ipgre_tunnel_change_mtu, |
| 1216 | }; |
| 1217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | static void ipgre_tunnel_setup(struct net_device *dev) |
| 1219 | { |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1220 | dev->netdev_ops = &ipgre_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | dev->destructor = free_netdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | |
| 1223 | dev->type = ARPHRD_IPGRE; |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 1224 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 1225 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | dev->flags = IFF_NOARP; |
| 1227 | dev->iflink = 0; |
| 1228 | dev->addr_len = 4; |
Pavel Emelyanov | 0b67ece | 2008-04-16 01:11:13 -0700 | [diff] [blame] | 1229 | dev->features |= NETIF_F_NETNS_LOCAL; |
Eric Dumazet | 108bfa8 | 2009-05-28 22:35:10 +0000 | [diff] [blame] | 1230 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | } |
| 1232 | |
| 1233 | static int ipgre_tunnel_init(struct net_device *dev) |
| 1234 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | struct ip_tunnel *tunnel; |
| 1236 | struct iphdr *iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1238 | tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | iph = &tunnel->parms.iph; |
| 1240 | |
| 1241 | tunnel->dev = dev; |
| 1242 | strcpy(tunnel->parms.name, dev->name); |
| 1243 | |
| 1244 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); |
| 1245 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); |
| 1246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | if (iph->daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1249 | if (ipv4_is_multicast(iph->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | if (!iph->saddr) |
| 1251 | return -EINVAL; |
| 1252 | dev->flags = IFF_BROADCAST; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1253 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | } |
| 1255 | #endif |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1256 | } else |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1257 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | return 0; |
| 1260 | } |
| 1261 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1262 | static void ipgre_fb_tunnel_init(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1264 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | struct iphdr *iph = &tunnel->parms.iph; |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1266 | struct ipgre_net *ign = net_generic(dev_net(dev), ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | |
| 1268 | tunnel->dev = dev; |
| 1269 | strcpy(tunnel->parms.name, dev->name); |
| 1270 | |
| 1271 | iph->version = 4; |
| 1272 | iph->protocol = IPPROTO_GRE; |
| 1273 | iph->ihl = 5; |
| 1274 | tunnel->hlen = sizeof(struct iphdr) + 4; |
| 1275 | |
| 1276 | dev_hold(dev); |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1277 | ign->tunnels_wc[0] = tunnel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | } |
| 1279 | |
| 1280 | |
Alexey Dobriyan | 3261309 | 2009-09-14 12:21:47 +0000 | [diff] [blame] | 1281 | static const struct net_protocol ipgre_protocol = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | .handler = ipgre_rcv, |
| 1283 | .err_handler = ipgre_err, |
Pavel Emelyanov | f96c148 | 2008-04-16 01:11:36 -0700 | [diff] [blame] | 1284 | .netns_ok = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | }; |
| 1286 | |
Eric Dumazet | eef6dd6 | 2009-10-27 07:07:16 +0000 | [diff] [blame] | 1287 | 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] | 1288 | { |
| 1289 | int prio; |
| 1290 | |
| 1291 | for (prio = 0; prio < 4; prio++) { |
| 1292 | int h; |
| 1293 | for (h = 0; h < HASH_SIZE; h++) { |
Eric Dumazet | eef6dd6 | 2009-10-27 07:07:16 +0000 | [diff] [blame] | 1294 | struct ip_tunnel *t = ign->tunnels[prio][h]; |
| 1295 | |
| 1296 | while (t != NULL) { |
| 1297 | unregister_netdevice_queue(t->dev, head); |
| 1298 | t = t->next; |
| 1299 | } |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1300 | } |
| 1301 | } |
| 1302 | } |
| 1303 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1304 | static int __net_init ipgre_init_net(struct net *net) |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1305 | { |
Eric W. Biederman | cfb8fbf | 2009-11-29 15:46:13 +0000 | [diff] [blame] | 1306 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1307 | int err; |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1308 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1309 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
| 1310 | ipgre_tunnel_setup); |
| 1311 | if (!ign->fb_tunnel_dev) { |
| 1312 | err = -ENOMEM; |
| 1313 | goto err_alloc_dev; |
| 1314 | } |
Alexey Dobriyan | be77e59 | 2008-11-23 17:26:26 -0800 | [diff] [blame] | 1315 | dev_net_set(ign->fb_tunnel_dev, net); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1316 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1317 | ipgre_fb_tunnel_init(ign->fb_tunnel_dev); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1318 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1319 | |
| 1320 | if ((err = register_netdev(ign->fb_tunnel_dev))) |
| 1321 | goto err_reg_dev; |
| 1322 | |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1323 | return 0; |
| 1324 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1325 | err_reg_dev: |
| 1326 | free_netdev(ign->fb_tunnel_dev); |
| 1327 | err_alloc_dev: |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1328 | return err; |
| 1329 | } |
| 1330 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1331 | static void __net_exit ipgre_exit_net(struct net *net) |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1332 | { |
| 1333 | struct ipgre_net *ign; |
Eric Dumazet | eef6dd6 | 2009-10-27 07:07:16 +0000 | [diff] [blame] | 1334 | LIST_HEAD(list); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1335 | |
| 1336 | ign = net_generic(net, ipgre_net_id); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1337 | rtnl_lock(); |
Eric Dumazet | eef6dd6 | 2009-10-27 07:07:16 +0000 | [diff] [blame] | 1338 | ipgre_destroy_tunnels(ign, &list); |
| 1339 | unregister_netdevice_many(&list); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1340 | rtnl_unlock(); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1341 | } |
| 1342 | |
| 1343 | static struct pernet_operations ipgre_net_ops = { |
| 1344 | .init = ipgre_init_net, |
| 1345 | .exit = ipgre_exit_net, |
Eric W. Biederman | cfb8fbf | 2009-11-29 15:46:13 +0000 | [diff] [blame] | 1346 | .id = &ipgre_net_id, |
| 1347 | .size = sizeof(struct ipgre_net), |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1348 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1350 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 1351 | { |
| 1352 | __be16 flags; |
| 1353 | |
| 1354 | if (!data) |
| 1355 | return 0; |
| 1356 | |
| 1357 | flags = 0; |
| 1358 | if (data[IFLA_GRE_IFLAGS]) |
| 1359 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 1360 | if (data[IFLA_GRE_OFLAGS]) |
| 1361 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 1362 | if (flags & (GRE_VERSION|GRE_ROUTING)) |
| 1363 | return -EINVAL; |
| 1364 | |
| 1365 | return 0; |
| 1366 | } |
| 1367 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1368 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 1369 | { |
| 1370 | __be32 daddr; |
| 1371 | |
| 1372 | if (tb[IFLA_ADDRESS]) { |
| 1373 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 1374 | return -EINVAL; |
| 1375 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 1376 | return -EADDRNOTAVAIL; |
| 1377 | } |
| 1378 | |
| 1379 | if (!data) |
| 1380 | goto out; |
| 1381 | |
| 1382 | if (data[IFLA_GRE_REMOTE]) { |
| 1383 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); |
| 1384 | if (!daddr) |
| 1385 | return -EINVAL; |
| 1386 | } |
| 1387 | |
| 1388 | out: |
| 1389 | return ipgre_tunnel_validate(tb, data); |
| 1390 | } |
| 1391 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1392 | static void ipgre_netlink_parms(struct nlattr *data[], |
| 1393 | struct ip_tunnel_parm *parms) |
| 1394 | { |
Herbert Xu | 7bb82d9 | 2008-10-11 12:20:15 -0700 | [diff] [blame] | 1395 | memset(parms, 0, sizeof(*parms)); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1396 | |
| 1397 | parms->iph.protocol = IPPROTO_GRE; |
| 1398 | |
| 1399 | if (!data) |
| 1400 | return; |
| 1401 | |
| 1402 | if (data[IFLA_GRE_LINK]) |
| 1403 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); |
| 1404 | |
| 1405 | if (data[IFLA_GRE_IFLAGS]) |
| 1406 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 1407 | |
| 1408 | if (data[IFLA_GRE_OFLAGS]) |
| 1409 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 1410 | |
| 1411 | if (data[IFLA_GRE_IKEY]) |
| 1412 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); |
| 1413 | |
| 1414 | if (data[IFLA_GRE_OKEY]) |
| 1415 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); |
| 1416 | |
| 1417 | if (data[IFLA_GRE_LOCAL]) |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1418 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1419 | |
| 1420 | if (data[IFLA_GRE_REMOTE]) |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1421 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1422 | |
| 1423 | if (data[IFLA_GRE_TTL]) |
| 1424 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); |
| 1425 | |
| 1426 | if (data[IFLA_GRE_TOS]) |
| 1427 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); |
| 1428 | |
| 1429 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) |
| 1430 | parms->iph.frag_off = htons(IP_DF); |
| 1431 | } |
| 1432 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1433 | static int ipgre_tap_init(struct net_device *dev) |
| 1434 | { |
| 1435 | struct ip_tunnel *tunnel; |
| 1436 | |
| 1437 | tunnel = netdev_priv(dev); |
| 1438 | |
| 1439 | tunnel->dev = dev; |
| 1440 | strcpy(tunnel->parms.name, dev->name); |
| 1441 | |
| 1442 | ipgre_tunnel_bind_dev(dev); |
| 1443 | |
| 1444 | return 0; |
| 1445 | } |
| 1446 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1447 | static const struct net_device_ops ipgre_tap_netdev_ops = { |
| 1448 | .ndo_init = ipgre_tap_init, |
| 1449 | .ndo_uninit = ipgre_tunnel_uninit, |
| 1450 | .ndo_start_xmit = ipgre_tunnel_xmit, |
| 1451 | .ndo_set_mac_address = eth_mac_addr, |
| 1452 | .ndo_validate_addr = eth_validate_addr, |
| 1453 | .ndo_change_mtu = ipgre_tunnel_change_mtu, |
| 1454 | }; |
| 1455 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1456 | static void ipgre_tap_setup(struct net_device *dev) |
| 1457 | { |
| 1458 | |
| 1459 | ether_setup(dev); |
| 1460 | |
Herbert Xu | 2e9526b | 2009-10-30 05:51:48 +0000 | [diff] [blame] | 1461 | dev->netdev_ops = &ipgre_tap_netdev_ops; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1462 | dev->destructor = free_netdev; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1463 | |
| 1464 | dev->iflink = 0; |
| 1465 | dev->features |= NETIF_F_NETNS_LOCAL; |
| 1466 | } |
| 1467 | |
Eric W. Biederman | 81adee4 | 2009-11-08 00:53:51 -0800 | [diff] [blame] | 1468 | 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] | 1469 | struct nlattr *data[]) |
| 1470 | { |
| 1471 | struct ip_tunnel *nt; |
| 1472 | struct net *net = dev_net(dev); |
| 1473 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 1474 | int mtu; |
| 1475 | int err; |
| 1476 | |
| 1477 | nt = netdev_priv(dev); |
| 1478 | ipgre_netlink_parms(data, &nt->parms); |
| 1479 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1480 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1481 | return -EEXIST; |
| 1482 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1483 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
| 1484 | random_ether_addr(dev->dev_addr); |
| 1485 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1486 | mtu = ipgre_tunnel_bind_dev(dev); |
| 1487 | if (!tb[IFLA_MTU]) |
| 1488 | dev->mtu = mtu; |
| 1489 | |
| 1490 | err = register_netdevice(dev); |
| 1491 | if (err) |
| 1492 | goto out; |
| 1493 | |
| 1494 | dev_hold(dev); |
| 1495 | ipgre_tunnel_link(ign, nt); |
| 1496 | |
| 1497 | out: |
| 1498 | return err; |
| 1499 | } |
| 1500 | |
| 1501 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
| 1502 | struct nlattr *data[]) |
| 1503 | { |
| 1504 | struct ip_tunnel *t, *nt; |
| 1505 | struct net *net = dev_net(dev); |
| 1506 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 1507 | struct ip_tunnel_parm p; |
| 1508 | int mtu; |
| 1509 | |
| 1510 | if (dev == ign->fb_tunnel_dev) |
| 1511 | return -EINVAL; |
| 1512 | |
| 1513 | nt = netdev_priv(dev); |
| 1514 | ipgre_netlink_parms(data, &p); |
| 1515 | |
| 1516 | t = ipgre_tunnel_locate(net, &p, 0); |
| 1517 | |
| 1518 | if (t) { |
| 1519 | if (t->dev != dev) |
| 1520 | return -EEXIST; |
| 1521 | } else { |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1522 | t = nt; |
| 1523 | |
Herbert Xu | 2e9526b | 2009-10-30 05:51:48 +0000 | [diff] [blame] | 1524 | if (dev->type != ARPHRD_ETHER) { |
| 1525 | unsigned nflags = 0; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1526 | |
Herbert Xu | 2e9526b | 2009-10-30 05:51:48 +0000 | [diff] [blame] | 1527 | if (ipv4_is_multicast(p.iph.daddr)) |
| 1528 | nflags = IFF_BROADCAST; |
| 1529 | else if (p.iph.daddr) |
| 1530 | nflags = IFF_POINTOPOINT; |
| 1531 | |
| 1532 | if ((dev->flags ^ nflags) & |
| 1533 | (IFF_POINTOPOINT | IFF_BROADCAST)) |
| 1534 | return -EINVAL; |
| 1535 | } |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1536 | |
| 1537 | ipgre_tunnel_unlink(ign, t); |
| 1538 | t->parms.iph.saddr = p.iph.saddr; |
| 1539 | t->parms.iph.daddr = p.iph.daddr; |
| 1540 | t->parms.i_key = p.i_key; |
Herbert Xu | 2e9526b | 2009-10-30 05:51:48 +0000 | [diff] [blame] | 1541 | if (dev->type != ARPHRD_ETHER) { |
| 1542 | memcpy(dev->dev_addr, &p.iph.saddr, 4); |
| 1543 | memcpy(dev->broadcast, &p.iph.daddr, 4); |
| 1544 | } |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1545 | ipgre_tunnel_link(ign, t); |
| 1546 | netdev_state_change(dev); |
| 1547 | } |
| 1548 | |
| 1549 | t->parms.o_key = p.o_key; |
| 1550 | t->parms.iph.ttl = p.iph.ttl; |
| 1551 | t->parms.iph.tos = p.iph.tos; |
| 1552 | t->parms.iph.frag_off = p.iph.frag_off; |
| 1553 | |
| 1554 | if (t->parms.link != p.link) { |
| 1555 | t->parms.link = p.link; |
| 1556 | mtu = ipgre_tunnel_bind_dev(dev); |
| 1557 | if (!tb[IFLA_MTU]) |
| 1558 | dev->mtu = mtu; |
| 1559 | netdev_state_change(dev); |
| 1560 | } |
| 1561 | |
| 1562 | return 0; |
| 1563 | } |
| 1564 | |
| 1565 | static size_t ipgre_get_size(const struct net_device *dev) |
| 1566 | { |
| 1567 | return |
| 1568 | /* IFLA_GRE_LINK */ |
| 1569 | nla_total_size(4) + |
| 1570 | /* IFLA_GRE_IFLAGS */ |
| 1571 | nla_total_size(2) + |
| 1572 | /* IFLA_GRE_OFLAGS */ |
| 1573 | nla_total_size(2) + |
| 1574 | /* IFLA_GRE_IKEY */ |
| 1575 | nla_total_size(4) + |
| 1576 | /* IFLA_GRE_OKEY */ |
| 1577 | nla_total_size(4) + |
| 1578 | /* IFLA_GRE_LOCAL */ |
| 1579 | nla_total_size(4) + |
| 1580 | /* IFLA_GRE_REMOTE */ |
| 1581 | nla_total_size(4) + |
| 1582 | /* IFLA_GRE_TTL */ |
| 1583 | nla_total_size(1) + |
| 1584 | /* IFLA_GRE_TOS */ |
| 1585 | nla_total_size(1) + |
| 1586 | /* IFLA_GRE_PMTUDISC */ |
| 1587 | nla_total_size(1) + |
| 1588 | 0; |
| 1589 | } |
| 1590 | |
| 1591 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 1592 | { |
| 1593 | struct ip_tunnel *t = netdev_priv(dev); |
| 1594 | struct ip_tunnel_parm *p = &t->parms; |
| 1595 | |
| 1596 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); |
| 1597 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); |
| 1598 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); |
Patrick McHardy | ba9e64b | 2008-10-10 12:10:30 -0700 | [diff] [blame] | 1599 | NLA_PUT_BE32(skb, IFLA_GRE_IKEY, p->i_key); |
| 1600 | NLA_PUT_BE32(skb, IFLA_GRE_OKEY, p->o_key); |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1601 | NLA_PUT_BE32(skb, IFLA_GRE_LOCAL, p->iph.saddr); |
| 1602 | NLA_PUT_BE32(skb, IFLA_GRE_REMOTE, p->iph.daddr); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1603 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); |
| 1604 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); |
| 1605 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); |
| 1606 | |
| 1607 | return 0; |
| 1608 | |
| 1609 | nla_put_failure: |
| 1610 | return -EMSGSIZE; |
| 1611 | } |
| 1612 | |
| 1613 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
| 1614 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, |
| 1615 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
| 1616 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
| 1617 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
| 1618 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1619 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
| 1620 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1621 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
| 1622 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, |
| 1623 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, |
| 1624 | }; |
| 1625 | |
| 1626 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { |
| 1627 | .kind = "gre", |
| 1628 | .maxtype = IFLA_GRE_MAX, |
| 1629 | .policy = ipgre_policy, |
| 1630 | .priv_size = sizeof(struct ip_tunnel), |
| 1631 | .setup = ipgre_tunnel_setup, |
| 1632 | .validate = ipgre_tunnel_validate, |
| 1633 | .newlink = ipgre_newlink, |
| 1634 | .changelink = ipgre_changelink, |
| 1635 | .get_size = ipgre_get_size, |
| 1636 | .fill_info = ipgre_fill_info, |
| 1637 | }; |
| 1638 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1639 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
| 1640 | .kind = "gretap", |
| 1641 | .maxtype = IFLA_GRE_MAX, |
| 1642 | .policy = ipgre_policy, |
| 1643 | .priv_size = sizeof(struct ip_tunnel), |
| 1644 | .setup = ipgre_tap_setup, |
| 1645 | .validate = ipgre_tap_validate, |
| 1646 | .newlink = ipgre_newlink, |
| 1647 | .changelink = ipgre_changelink, |
| 1648 | .get_size = ipgre_get_size, |
| 1649 | .fill_info = ipgre_fill_info, |
| 1650 | }; |
| 1651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | /* |
| 1653 | * And now the modules code and kernel interface. |
| 1654 | */ |
| 1655 | |
| 1656 | static int __init ipgre_init(void) |
| 1657 | { |
| 1658 | int err; |
| 1659 | |
| 1660 | printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); |
| 1661 | |
Eric W. Biederman | cfb8fbf | 2009-11-29 15:46:13 +0000 | [diff] [blame] | 1662 | err = register_pernet_device(&ipgre_net_ops); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1663 | if (err < 0) |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1664 | return err; |
| 1665 | |
| 1666 | err = inet_add_protocol(&ipgre_protocol, IPPROTO_GRE); |
| 1667 | if (err < 0) { |
| 1668 | printk(KERN_INFO "ipgre init: can't add protocol\n"); |
| 1669 | goto add_proto_failed; |
| 1670 | } |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1671 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1672 | err = rtnl_link_register(&ipgre_link_ops); |
| 1673 | if (err < 0) |
| 1674 | goto rtnl_link_failed; |
| 1675 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1676 | err = rtnl_link_register(&ipgre_tap_ops); |
| 1677 | if (err < 0) |
| 1678 | goto tap_ops_failed; |
| 1679 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1680 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | return err; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1682 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1683 | tap_ops_failed: |
| 1684 | rtnl_link_unregister(&ipgre_link_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1685 | rtnl_link_failed: |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1686 | inet_del_protocol(&ipgre_protocol, IPPROTO_GRE); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1687 | add_proto_failed: |
| 1688 | unregister_pernet_device(&ipgre_net_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1689 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | } |
| 1691 | |
Alexey Kuznetsov | db44575 | 2005-07-30 17:46:44 -0700 | [diff] [blame] | 1692 | static void __exit ipgre_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1694 | rtnl_link_unregister(&ipgre_tap_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1695 | rtnl_link_unregister(&ipgre_link_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | if (inet_del_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) |
| 1697 | printk(KERN_INFO "ipgre close: can't remove protocol\n"); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1698 | unregister_pernet_device(&ipgre_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | } |
| 1700 | |
| 1701 | module_init(ipgre_init); |
| 1702 | module_exit(ipgre_fini); |
| 1703 | MODULE_LICENSE("GPL"); |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1704 | MODULE_ALIAS_RTNL_LINK("gre"); |
| 1705 | MODULE_ALIAS_RTNL_LINK("gretap"); |