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> |
| 17 | #include <asm/uaccess.h> |
| 18 | #include <linux/skbuff.h> |
| 19 | #include <linux/netdevice.h> |
| 20 | #include <linux/in.h> |
| 21 | #include <linux/tcp.h> |
| 22 | #include <linux/udp.h> |
| 23 | #include <linux/if_arp.h> |
| 24 | #include <linux/mroute.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/in6.h> |
| 27 | #include <linux/inetdevice.h> |
| 28 | #include <linux/igmp.h> |
| 29 | #include <linux/netfilter_ipv4.h> |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 30 | #include <linux/etherdevice.h> |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 31 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #include <net/sock.h> |
| 34 | #include <net/ip.h> |
| 35 | #include <net/icmp.h> |
| 36 | #include <net/protocol.h> |
| 37 | #include <net/ipip.h> |
| 38 | #include <net/arp.h> |
| 39 | #include <net/checksum.h> |
| 40 | #include <net/dsfield.h> |
| 41 | #include <net/inet_ecn.h> |
| 42 | #include <net/xfrm.h> |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 43 | #include <net/net_namespace.h> |
| 44 | #include <net/netns/generic.h> |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 45 | #include <net/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | #ifdef CONFIG_IPV6 |
| 48 | #include <net/ipv6.h> |
| 49 | #include <net/ip6_fib.h> |
| 50 | #include <net/ip6_route.h> |
| 51 | #endif |
| 52 | |
| 53 | /* |
| 54 | Problems & solutions |
| 55 | -------------------- |
| 56 | |
| 57 | 1. The most important issue is detecting local dead loops. |
| 58 | They would cause complete host lockup in transmit, which |
| 59 | would be "resolved" by stack overflow or, if queueing is enabled, |
| 60 | with infinite looping in net_bh. |
| 61 | |
| 62 | We cannot track such dead loops during route installation, |
| 63 | it is infeasible task. The most general solutions would be |
| 64 | to keep skb->encapsulation counter (sort of local ttl), |
| 65 | and silently drop packet when it expires. It is the best |
| 66 | solution, but it supposes maintaing new variable in ALL |
| 67 | skb, even if no tunneling is used. |
| 68 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 69 | Current solution: t->recursion lock breaks dead loops. It looks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | like dev->tbusy flag, but I preferred new variable, because |
| 71 | the semantics is different. One day, when hard_start_xmit |
| 72 | will be multithreaded we will have to use skb->encapsulation. |
| 73 | |
| 74 | |
| 75 | |
| 76 | 2. Networking dead loops would not kill routers, but would really |
| 77 | kill network. IP hop limit plays role of "t->recursion" in this case, |
| 78 | if we copy it from packet being encapsulated to upper header. |
| 79 | It is very good solution, but it introduces two problems: |
| 80 | |
| 81 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), |
| 82 | do not work over tunnels. |
| 83 | - traceroute does not work. I planned to relay ICMP from tunnel, |
| 84 | so that this problem would be solved and traceroute output |
| 85 | would even more informative. This idea appeared to be wrong: |
| 86 | only Linux complies to rfc1812 now (yes, guys, Linux is the only |
| 87 | true router now :-)), all routers (at least, in neighbourhood of mine) |
| 88 | return only 8 bytes of payload. It is the end. |
| 89 | |
| 90 | Hence, if we want that OSPF worked or traceroute said something reasonable, |
| 91 | we should search for another solution. |
| 92 | |
| 93 | One of them is to parse packet trying to detect inner encapsulation |
| 94 | made by our node. It is difficult or even impossible, especially, |
| 95 | taking into account fragmentation. TO be short, tt is not solution at all. |
| 96 | |
| 97 | Current solution: The solution was UNEXPECTEDLY SIMPLE. |
| 98 | We force DF flag on tunnels with preconfigured hop limit, |
| 99 | that is ALL. :-) Well, it does not remove the problem completely, |
| 100 | but exponential growth of network traffic is changed to linear |
| 101 | (branches, that exceed pmtu are pruned) and tunnel mtu |
| 102 | fastly degrades to value <68, where looping stops. |
| 103 | Yes, it is not good if there exists a router in the loop, |
| 104 | which does not force DF, even when encapsulating packets have DF set. |
| 105 | But it is not our problem! Nobody could accuse us, we made |
| 106 | all that we could make. Even if it is your gated who injected |
| 107 | fatal route to network, even if it were you who configured |
| 108 | fatal static route: you are innocent. :-) |
| 109 | |
| 110 | |
| 111 | |
| 112 | 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain |
| 113 | practically identical code. It would be good to glue them |
| 114 | together, but it is not very evident, how to make them modular. |
| 115 | sit is integral part of IPv6, ipip and gre are naturally modular. |
| 116 | We could extract common parts (hash table, ioctl etc) |
| 117 | to a separate module (ip_tunnel.c). |
| 118 | |
| 119 | Alexey Kuznetsov. |
| 120 | */ |
| 121 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 122 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | static int ipgre_tunnel_init(struct net_device *dev); |
| 124 | static void ipgre_tunnel_setup(struct net_device *dev); |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 125 | static int ipgre_tunnel_bind_dev(struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
| 127 | /* Fallback tunnel: no source, no destination, no key, no options */ |
| 128 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 129 | #define HASH_SIZE 16 |
| 130 | |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 131 | static int ipgre_net_id; |
| 132 | struct ipgre_net { |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 133 | struct ip_tunnel *tunnels[4][HASH_SIZE]; |
| 134 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 135 | struct net_device *fb_tunnel_dev; |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 136 | }; |
| 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* Tunnel hash table */ |
| 139 | |
| 140 | /* |
| 141 | 4 hash tables: |
| 142 | |
| 143 | 3: (remote,local) |
| 144 | 2: (remote,*) |
| 145 | 1: (*,local) |
| 146 | 0: (*,*) |
| 147 | |
| 148 | We require exact key match i.e. if a key is present in packet |
| 149 | it will match only tunnel with the same key; if it is not present, |
| 150 | it will match only keyless tunnel. |
| 151 | |
| 152 | All keysless packets, if not matched configured keyless tunnels |
| 153 | will match fallback tunnel. |
| 154 | */ |
| 155 | |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 156 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 158 | #define tunnels_r_l tunnels[3] |
| 159 | #define tunnels_r tunnels[2] |
| 160 | #define tunnels_l tunnels[1] |
| 161 | #define tunnels_wc tunnels[0] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
| 163 | static DEFINE_RWLOCK(ipgre_lock); |
| 164 | |
| 165 | /* Given src, dst and key, find appropriate for input tunnel. */ |
| 166 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 167 | static struct ip_tunnel * ipgre_tunnel_lookup(struct net *net, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 168 | __be32 remote, __be32 local, |
| 169 | __be32 key, __be16 gre_proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | { |
| 171 | unsigned h0 = HASH(remote); |
| 172 | unsigned h1 = HASH(key); |
| 173 | struct ip_tunnel *t; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 174 | struct ip_tunnel *t2 = NULL; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 175 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 176 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
| 177 | ARPHRD_ETHER : ARPHRD_IPGRE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 179 | for (t = ign->tunnels_r_l[h0^h1]; t; t = t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 181 | if (t->parms.i_key == key && t->dev->flags & IFF_UP) { |
| 182 | if (t->dev->type == dev_type) |
| 183 | return t; |
| 184 | if (t->dev->type == ARPHRD_IPGRE && !t2) |
| 185 | t2 = t; |
| 186 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 189 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 190 | for (t = ign->tunnels_r[h0^h1]; t; t = t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | if (remote == t->parms.iph.daddr) { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 192 | if (t->parms.i_key == key && t->dev->flags & IFF_UP) { |
| 193 | if (t->dev->type == dev_type) |
| 194 | return t; |
| 195 | if (t->dev->type == ARPHRD_IPGRE && !t2) |
| 196 | t2 = t; |
| 197 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | } |
| 199 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 200 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 201 | for (t = ign->tunnels_l[h1]; t; t = t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | if (local == t->parms.iph.saddr || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 203 | (local == t->parms.iph.daddr && |
| 204 | ipv4_is_multicast(local))) { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 205 | if (t->parms.i_key == key && t->dev->flags & IFF_UP) { |
| 206 | if (t->dev->type == dev_type) |
| 207 | return t; |
| 208 | if (t->dev->type == ARPHRD_IPGRE && !t2) |
| 209 | t2 = t; |
| 210 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 213 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 214 | for (t = ign->tunnels_wc[h1]; t; t = t->next) { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 215 | if (t->parms.i_key == key && t->dev->flags & IFF_UP) { |
| 216 | if (t->dev->type == dev_type) |
| 217 | return t; |
| 218 | if (t->dev->type == ARPHRD_IPGRE && !t2) |
| 219 | t2 = t; |
| 220 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 223 | if (t2) |
| 224 | return t2; |
| 225 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 226 | if (ign->fb_tunnel_dev->flags&IFF_UP) |
| 227 | return netdev_priv(ign->fb_tunnel_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return NULL; |
| 229 | } |
| 230 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 231 | static struct ip_tunnel **__ipgre_bucket(struct ipgre_net *ign, |
| 232 | struct ip_tunnel_parm *parms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 234 | __be32 remote = parms->iph.daddr; |
| 235 | __be32 local = parms->iph.saddr; |
| 236 | __be32 key = parms->i_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | unsigned h = HASH(key); |
| 238 | int prio = 0; |
| 239 | |
| 240 | if (local) |
| 241 | prio |= 1; |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 242 | if (remote && !ipv4_is_multicast(remote)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | prio |= 2; |
| 244 | h ^= HASH(remote); |
| 245 | } |
| 246 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 247 | return &ign->tunnels[prio][h]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | } |
| 249 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 250 | static inline struct ip_tunnel **ipgre_bucket(struct ipgre_net *ign, |
| 251 | struct ip_tunnel *t) |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 252 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 253 | return __ipgre_bucket(ign, &t->parms); |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 254 | } |
| 255 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 256 | 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] | 257 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 258 | struct ip_tunnel **tp = ipgre_bucket(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
| 260 | t->next = *tp; |
| 261 | write_lock_bh(&ipgre_lock); |
| 262 | *tp = t; |
| 263 | write_unlock_bh(&ipgre_lock); |
| 264 | } |
| 265 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 266 | 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] | 267 | { |
| 268 | struct ip_tunnel **tp; |
| 269 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 270 | for (tp = ipgre_bucket(ign, t); *tp; tp = &(*tp)->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | if (t == *tp) { |
| 272 | write_lock_bh(&ipgre_lock); |
| 273 | *tp = t->next; |
| 274 | write_unlock_bh(&ipgre_lock); |
| 275 | break; |
| 276 | } |
| 277 | } |
| 278 | } |
| 279 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 280 | static struct ip_tunnel *ipgre_tunnel_find(struct net *net, |
| 281 | struct ip_tunnel_parm *parms, |
| 282 | int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 284 | __be32 remote = parms->iph.daddr; |
| 285 | __be32 local = parms->iph.saddr; |
| 286 | __be32 key = parms->i_key; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 287 | struct ip_tunnel *t, **tp; |
| 288 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 289 | |
| 290 | for (tp = __ipgre_bucket(ign, parms); (t = *tp) != NULL; tp = &t->next) |
| 291 | if (local == t->parms.iph.saddr && |
| 292 | remote == t->parms.iph.daddr && |
| 293 | key == t->parms.i_key && |
| 294 | type == t->dev->type) |
| 295 | break; |
| 296 | |
| 297 | return t; |
| 298 | } |
| 299 | |
| 300 | static struct ip_tunnel * ipgre_tunnel_locate(struct net *net, |
| 301 | struct ip_tunnel_parm *parms, int create) |
| 302 | { |
| 303 | struct ip_tunnel *t, *nt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | char name[IFNAMSIZ]; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 306 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 308 | t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE); |
| 309 | if (t || !create) |
| 310 | return t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
| 312 | if (parms->name[0]) |
| 313 | strlcpy(name, parms->name, IFNAMSIZ); |
Pavel Emelyanov | 34cc7ba | 2008-02-23 20:19:20 -0800 | [diff] [blame] | 314 | else |
| 315 | sprintf(name, "gre%%d"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); |
| 318 | if (!dev) |
| 319 | return NULL; |
| 320 | |
Pavel Emelyanov | 0b67ece | 2008-04-16 01:11:13 -0700 | [diff] [blame] | 321 | dev_net_set(dev, net); |
| 322 | |
Pavel Emelyanov | b37d428 | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 323 | if (strchr(name, '%')) { |
| 324 | if (dev_alloc_name(dev, name) < 0) |
| 325 | goto failed_free; |
| 326 | } |
| 327 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 328 | nt = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | nt->parms = *parms; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 330 | dev->rtnl_link_ops = &ipgre_link_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 332 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
| 333 | |
Pavel Emelyanov | b37d428 | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 334 | if (register_netdevice(dev) < 0) |
| 335 | goto failed_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | dev_hold(dev); |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 338 | ipgre_tunnel_link(ign, nt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | return nt; |
| 340 | |
Pavel Emelyanov | b37d428 | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 341 | failed_free: |
| 342 | free_netdev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | return NULL; |
| 344 | } |
| 345 | |
| 346 | static void ipgre_tunnel_uninit(struct net_device *dev) |
| 347 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 348 | struct net *net = dev_net(dev); |
| 349 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 350 | |
| 351 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | dev_put(dev); |
| 353 | } |
| 354 | |
| 355 | |
| 356 | static void ipgre_err(struct sk_buff *skb, u32 info) |
| 357 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Rami Rosen | 071f92d | 2008-05-21 17:47:54 -0700 | [diff] [blame] | 359 | /* All the routers (except for Linux) return only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | 8 bytes of packet payload. It means, that precise relaying of |
| 361 | ICMP in the real Internet is absolutely infeasible. |
| 362 | |
| 363 | Moreover, Cisco "wise men" put GRE key to the third word |
| 364 | in GRE header. It makes impossible maintaining even soft state for keyed |
| 365 | GRE tunnels with enabled checksum. Tell them "thank you". |
| 366 | |
| 367 | Well, I wonder, rfc1812 was written by Cisco employee, |
| 368 | what the hell these idiots break standrads established |
| 369 | by themself??? |
| 370 | */ |
| 371 | |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 372 | struct iphdr *iph = (struct iphdr *)skb->data; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 373 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | int grehlen = (iph->ihl<<2) + 4; |
Arnaldo Carvalho de Melo | 88c7664 | 2007-03-13 14:43:18 -0300 | [diff] [blame] | 375 | const int type = icmp_hdr(skb)->type; |
| 376 | const int code = icmp_hdr(skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | struct ip_tunnel *t; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 378 | __be16 flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | flags = p[0]; |
| 381 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { |
| 382 | if (flags&(GRE_VERSION|GRE_ROUTING)) |
| 383 | return; |
| 384 | if (flags&GRE_KEY) { |
| 385 | grehlen += 4; |
| 386 | if (flags&GRE_CSUM) |
| 387 | grehlen += 4; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | /* If only 8 bytes returned, keyed message will be dropped here */ |
| 392 | if (skb_headlen(skb) < grehlen) |
| 393 | return; |
| 394 | |
| 395 | switch (type) { |
| 396 | default: |
| 397 | case ICMP_PARAMETERPROB: |
| 398 | return; |
| 399 | |
| 400 | case ICMP_DEST_UNREACH: |
| 401 | switch (code) { |
| 402 | case ICMP_SR_FAILED: |
| 403 | case ICMP_PORT_UNREACH: |
| 404 | /* Impossible event. */ |
| 405 | return; |
| 406 | case ICMP_FRAG_NEEDED: |
| 407 | /* Soft state for pmtu is maintained by IP core. */ |
| 408 | return; |
| 409 | default: |
| 410 | /* All others are translated to HOST_UNREACH. |
| 411 | rfc2003 contains "deep thoughts" about NET_UNREACH, |
| 412 | I believe they are just ether pollution. --ANK |
| 413 | */ |
| 414 | break; |
| 415 | } |
| 416 | break; |
| 417 | case ICMP_TIME_EXCEEDED: |
| 418 | if (code != ICMP_EXC_TTL) |
| 419 | return; |
| 420 | break; |
| 421 | } |
| 422 | |
| 423 | read_lock(&ipgre_lock); |
Pavel Emelyanov | 3b4667f | 2008-04-16 01:09:44 -0700 | [diff] [blame] | 424 | t = ipgre_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 425 | flags & GRE_KEY ? |
| 426 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, |
| 427 | p[1]); |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 428 | if (t == NULL || t->parms.iph.daddr == 0 || |
| 429 | ipv4_is_multicast(t->parms.iph.daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | goto out; |
| 431 | |
| 432 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
| 433 | goto out; |
| 434 | |
| 435 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) |
| 436 | t->err_count++; |
| 437 | else |
| 438 | t->err_count = 1; |
| 439 | t->err_time = jiffies; |
| 440 | out: |
| 441 | read_unlock(&ipgre_lock); |
| 442 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | static inline void ipgre_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) |
| 446 | { |
| 447 | if (INET_ECN_is_ce(iph->tos)) { |
| 448 | if (skb->protocol == htons(ETH_P_IP)) { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 449 | IP_ECN_set_ce(ip_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 451 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | } |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | static inline u8 |
| 457 | ipgre_ecn_encapsulate(u8 tos, struct iphdr *old_iph, struct sk_buff *skb) |
| 458 | { |
| 459 | u8 inner = 0; |
| 460 | if (skb->protocol == htons(ETH_P_IP)) |
| 461 | inner = old_iph->tos; |
| 462 | else if (skb->protocol == htons(ETH_P_IPV6)) |
| 463 | inner = ipv6_get_dsfield((struct ipv6hdr *)old_iph); |
| 464 | return INET_ECN_encapsulate(tos, inner); |
| 465 | } |
| 466 | |
| 467 | static int ipgre_rcv(struct sk_buff *skb) |
| 468 | { |
| 469 | struct iphdr *iph; |
| 470 | u8 *h; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 471 | __be16 flags; |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 472 | __sum16 csum = 0; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 473 | __be32 key = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | u32 seqno = 0; |
| 475 | struct ip_tunnel *tunnel; |
| 476 | int offset = 4; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 477 | __be16 gre_proto; |
Herbert Xu | 64194c3 | 2008-10-09 12:03:17 -0700 | [diff] [blame] | 478 | unsigned int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
| 480 | if (!pskb_may_pull(skb, 16)) |
| 481 | goto drop_nolock; |
| 482 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 483 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | h = skb->data; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 485 | flags = *(__be16*)h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | |
| 487 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { |
| 488 | /* - Version must be 0. |
| 489 | - We do not support routing headers. |
| 490 | */ |
| 491 | if (flags&(GRE_VERSION|GRE_ROUTING)) |
| 492 | goto drop_nolock; |
| 493 | |
| 494 | if (flags&GRE_CSUM) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 495 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 496 | case CHECKSUM_COMPLETE: |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 497 | csum = csum_fold(skb->csum); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 498 | if (!csum) |
| 499 | break; |
| 500 | /* fall through */ |
| 501 | case CHECKSUM_NONE: |
| 502 | skb->csum = 0; |
| 503 | csum = __skb_checksum_complete(skb); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 504 | skb->ip_summed = CHECKSUM_COMPLETE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
| 506 | offset += 4; |
| 507 | } |
| 508 | if (flags&GRE_KEY) { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 509 | key = *(__be32*)(h + offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | offset += 4; |
| 511 | } |
| 512 | if (flags&GRE_SEQ) { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 513 | seqno = ntohl(*(__be32*)(h + offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | offset += 4; |
| 515 | } |
| 516 | } |
| 517 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 518 | gre_proto = *(__be16 *)(h + 2); |
| 519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | read_lock(&ipgre_lock); |
Pavel Emelyanov | 3b4667f | 2008-04-16 01:09:44 -0700 | [diff] [blame] | 521 | if ((tunnel = ipgre_tunnel_lookup(dev_net(skb->dev), |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 522 | iph->saddr, iph->daddr, key, |
| 523 | gre_proto))) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 524 | struct net_device_stats *stats = &tunnel->dev->stats; |
| 525 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | secpath_reset(skb); |
| 527 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 528 | skb->protocol = gre_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | /* WCCP version 1 and 2 protocol decoding. |
| 530 | * - Change protocol to IP |
| 531 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header |
| 532 | */ |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 533 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
YOSHIFUJI Hideaki | 496c98d | 2006-10-10 19:41:21 -0700 | [diff] [blame] | 534 | skb->protocol = htons(ETH_P_IP); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 535 | if ((*(h + offset) & 0xF0) != 0x40) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | offset += 4; |
| 537 | } |
| 538 | |
Timo Teras | 1d06916 | 2007-12-20 00:10:33 -0800 | [diff] [blame] | 539 | skb->mac_header = skb->network_header; |
Arnaldo Carvalho de Melo | 4209fb6 | 2007-03-10 18:42:03 -0300 | [diff] [blame] | 540 | __pskb_pull(skb, offset); |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 541 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | skb->pkt_type = PACKET_HOST; |
| 543 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 544 | if (ipv4_is_multicast(iph->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | /* Looped back packet, drop it! */ |
Eric Dumazet | ee6b967 | 2008-03-05 18:30:47 -0800 | [diff] [blame] | 546 | if (skb->rtable->fl.iif == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | goto drop; |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 548 | stats->multicast++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | skb->pkt_type = PACKET_BROADCAST; |
| 550 | } |
| 551 | #endif |
| 552 | |
| 553 | if (((flags&GRE_CSUM) && csum) || |
| 554 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 555 | stats->rx_crc_errors++; |
| 556 | stats->rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | goto drop; |
| 558 | } |
| 559 | if (tunnel->parms.i_flags&GRE_SEQ) { |
| 560 | if (!(flags&GRE_SEQ) || |
| 561 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 562 | stats->rx_fifo_errors++; |
| 563 | stats->rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | goto drop; |
| 565 | } |
| 566 | tunnel->i_seqno = seqno + 1; |
| 567 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 568 | |
Herbert Xu | 64194c3 | 2008-10-09 12:03:17 -0700 | [diff] [blame] | 569 | len = skb->len; |
| 570 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 571 | /* Warning: All skb pointers will be invalidated! */ |
| 572 | if (tunnel->dev->type == ARPHRD_ETHER) { |
| 573 | if (!pskb_may_pull(skb, ETH_HLEN)) { |
| 574 | stats->rx_length_errors++; |
| 575 | stats->rx_errors++; |
| 576 | goto drop; |
| 577 | } |
| 578 | |
| 579 | iph = ip_hdr(skb); |
| 580 | skb->protocol = eth_type_trans(skb, tunnel->dev); |
| 581 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| 582 | } |
| 583 | |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 584 | stats->rx_packets++; |
Herbert Xu | 64194c3 | 2008-10-09 12:03:17 -0700 | [diff] [blame] | 585 | stats->rx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | skb->dev = tunnel->dev; |
| 587 | dst_release(skb->dst); |
| 588 | skb->dst = NULL; |
| 589 | nf_reset(skb); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 590 | |
| 591 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | ipgre_ecn_decapsulate(iph, skb); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 593 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | netif_rx(skb); |
| 595 | read_unlock(&ipgre_lock); |
| 596 | return(0); |
| 597 | } |
Herbert Xu | 45af08b | 2006-04-05 22:31:19 -0700 | [diff] [blame] | 598 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | drop: |
| 601 | read_unlock(&ipgre_lock); |
| 602 | drop_nolock: |
| 603 | kfree_skb(skb); |
| 604 | return(0); |
| 605 | } |
| 606 | |
| 607 | static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
| 608 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 609 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 610 | struct net_device_stats *stats = &tunnel->dev->stats; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 611 | struct iphdr *old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | struct iphdr *tiph; |
| 613 | u8 tos; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 614 | __be16 df; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | struct rtable *rt; /* Route to the other host */ |
| 616 | struct net_device *tdev; /* Device to other host */ |
| 617 | struct iphdr *iph; /* Our new IP header */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 618 | unsigned int max_headroom; /* The extra header space needed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | int gre_hlen; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 620 | __be32 dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | int mtu; |
| 622 | |
| 623 | if (tunnel->recursion++) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 624 | stats->collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | goto tx_error; |
| 626 | } |
| 627 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 628 | if (dev->type == ARPHRD_ETHER) |
| 629 | IPCB(skb)->flags = 0; |
| 630 | |
| 631 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | gre_hlen = 0; |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 633 | tiph = (struct iphdr *)skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | } else { |
| 635 | gre_hlen = tunnel->hlen; |
| 636 | tiph = &tunnel->parms.iph; |
| 637 | } |
| 638 | |
| 639 | if ((dst = tiph->daddr) == 0) { |
| 640 | /* NBMA tunnel */ |
| 641 | |
| 642 | if (skb->dst == NULL) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 643 | stats->tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | goto tx_error; |
| 645 | } |
| 646 | |
| 647 | if (skb->protocol == htons(ETH_P_IP)) { |
Eric Dumazet | ee6b967 | 2008-03-05 18:30:47 -0800 | [diff] [blame] | 648 | rt = skb->rtable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | if ((dst = rt->rt_gateway) == 0) |
| 650 | goto tx_error_icmp; |
| 651 | } |
| 652 | #ifdef CONFIG_IPV6 |
| 653 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
| 654 | struct in6_addr *addr6; |
| 655 | int addr_type; |
| 656 | struct neighbour *neigh = skb->dst->neighbour; |
| 657 | |
| 658 | if (neigh == NULL) |
| 659 | goto tx_error; |
| 660 | |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 661 | addr6 = (struct in6_addr *)&neigh->primary_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | addr_type = ipv6_addr_type(addr6); |
| 663 | |
| 664 | if (addr_type == IPV6_ADDR_ANY) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 665 | addr6 = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | addr_type = ipv6_addr_type(addr6); |
| 667 | } |
| 668 | |
| 669 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) |
| 670 | goto tx_error_icmp; |
| 671 | |
| 672 | dst = addr6->s6_addr32[3]; |
| 673 | } |
| 674 | #endif |
| 675 | else |
| 676 | goto tx_error; |
| 677 | } |
| 678 | |
| 679 | tos = tiph->tos; |
| 680 | if (tos&1) { |
| 681 | if (skb->protocol == htons(ETH_P_IP)) |
| 682 | tos = old_iph->tos; |
| 683 | tos &= ~1; |
| 684 | } |
| 685 | |
| 686 | { |
| 687 | struct flowi fl = { .oif = tunnel->parms.link, |
| 688 | .nl_u = { .ip4_u = |
| 689 | { .daddr = dst, |
| 690 | .saddr = tiph->saddr, |
| 691 | .tos = RT_TOS(tos) } }, |
| 692 | .proto = IPPROTO_GRE }; |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 693 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 694 | stats->tx_carrier_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | goto tx_error; |
| 696 | } |
| 697 | } |
| 698 | tdev = rt->u.dst.dev; |
| 699 | |
| 700 | if (tdev == dev) { |
| 701 | ip_rt_put(rt); |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 702 | stats->collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | goto tx_error; |
| 704 | } |
| 705 | |
| 706 | df = tiph->frag_off; |
| 707 | if (df) |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 708 | mtu = dst_mtu(&rt->u.dst) - dev->hard_header_len - tunnel->hlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | else |
| 710 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; |
| 711 | |
| 712 | if (skb->dst) |
| 713 | skb->dst->ops->update_pmtu(skb->dst, mtu); |
| 714 | |
| 715 | if (skb->protocol == htons(ETH_P_IP)) { |
| 716 | df |= (old_iph->frag_off&htons(IP_DF)); |
| 717 | |
| 718 | if ((old_iph->frag_off&htons(IP_DF)) && |
| 719 | mtu < ntohs(old_iph->tot_len)) { |
| 720 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
| 721 | ip_rt_put(rt); |
| 722 | goto tx_error; |
| 723 | } |
| 724 | } |
| 725 | #ifdef CONFIG_IPV6 |
| 726 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 727 | struct rt6_info *rt6 = (struct rt6_info *)skb->dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | if (rt6 && mtu < dst_mtu(skb->dst) && mtu >= IPV6_MIN_MTU) { |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 730 | if ((tunnel->parms.iph.daddr && |
| 731 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | rt6->rt6i_dst.plen == 128) { |
| 733 | rt6->rt6i_flags |= RTF_MODIFIED; |
| 734 | skb->dst->metrics[RTAX_MTU-1] = mtu; |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { |
| 739 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); |
| 740 | ip_rt_put(rt); |
| 741 | goto tx_error; |
| 742 | } |
| 743 | } |
| 744 | #endif |
| 745 | |
| 746 | if (tunnel->err_count > 0) { |
| 747 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { |
| 748 | tunnel->err_count--; |
| 749 | |
| 750 | dst_link_failure(skb); |
| 751 | } else |
| 752 | tunnel->err_count = 0; |
| 753 | } |
| 754 | |
| 755 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen; |
| 756 | |
Patrick McHardy | cfbba49 | 2007-07-09 15:33:40 -0700 | [diff] [blame] | 757 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
| 758 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
| 760 | if (!new_skb) { |
| 761 | ip_rt_put(rt); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 762 | stats->tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | dev_kfree_skb(skb); |
| 764 | tunnel->recursion--; |
| 765 | return 0; |
| 766 | } |
| 767 | if (skb->sk) |
| 768 | skb_set_owner_w(new_skb, skb->sk); |
| 769 | dev_kfree_skb(skb); |
| 770 | skb = new_skb; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 771 | old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | } |
| 773 | |
Herbert Xu | 64194c3 | 2008-10-09 12:03:17 -0700 | [diff] [blame] | 774 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 775 | skb_push(skb, gre_hlen); |
| 776 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
Patrick McHardy | 48d5cad | 2006-02-15 15:10:22 -0800 | [diff] [blame] | 778 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
| 779 | IPSKB_REROUTED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | dst_release(skb->dst); |
| 781 | skb->dst = &rt->u.dst; |
| 782 | |
| 783 | /* |
| 784 | * Push down and install the IPIP header. |
| 785 | */ |
| 786 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 787 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | iph->version = 4; |
| 789 | iph->ihl = sizeof(struct iphdr) >> 2; |
| 790 | iph->frag_off = df; |
| 791 | iph->protocol = IPPROTO_GRE; |
| 792 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); |
| 793 | iph->daddr = rt->rt_dst; |
| 794 | iph->saddr = rt->rt_src; |
| 795 | |
| 796 | if ((iph->ttl = tiph->ttl) == 0) { |
| 797 | if (skb->protocol == htons(ETH_P_IP)) |
| 798 | iph->ttl = old_iph->ttl; |
| 799 | #ifdef CONFIG_IPV6 |
| 800 | else if (skb->protocol == htons(ETH_P_IPV6)) |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 801 | iph->ttl = ((struct ipv6hdr *)old_iph)->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | #endif |
| 803 | else |
| 804 | iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT); |
| 805 | } |
| 806 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 807 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
| 808 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? |
| 809 | htons(ETH_P_TEB) : skb->protocol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
| 811 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 812 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
| 814 | if (tunnel->parms.o_flags&GRE_SEQ) { |
| 815 | ++tunnel->o_seqno; |
| 816 | *ptr = htonl(tunnel->o_seqno); |
| 817 | ptr--; |
| 818 | } |
| 819 | if (tunnel->parms.o_flags&GRE_KEY) { |
| 820 | *ptr = tunnel->parms.o_key; |
| 821 | ptr--; |
| 822 | } |
| 823 | if (tunnel->parms.o_flags&GRE_CSUM) { |
| 824 | *ptr = 0; |
Al Viro | 5f92a73 | 2006-11-14 21:36:54 -0800 | [diff] [blame] | 825 | *(__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] | 826 | } |
| 827 | } |
| 828 | |
| 829 | nf_reset(skb); |
| 830 | |
| 831 | IPTUNNEL_XMIT(); |
| 832 | tunnel->recursion--; |
| 833 | return 0; |
| 834 | |
| 835 | tx_error_icmp: |
| 836 | dst_link_failure(skb); |
| 837 | |
| 838 | tx_error: |
| 839 | stats->tx_errors++; |
| 840 | dev_kfree_skb(skb); |
| 841 | tunnel->recursion--; |
| 842 | return 0; |
| 843 | } |
| 844 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 845 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 846 | { |
| 847 | struct net_device *tdev = NULL; |
| 848 | struct ip_tunnel *tunnel; |
| 849 | struct iphdr *iph; |
| 850 | int hlen = LL_MAX_HEADER; |
| 851 | int mtu = ETH_DATA_LEN; |
| 852 | int addend = sizeof(struct iphdr) + 4; |
| 853 | |
| 854 | tunnel = netdev_priv(dev); |
| 855 | iph = &tunnel->parms.iph; |
| 856 | |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 857 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 858 | |
| 859 | if (iph->daddr) { |
| 860 | struct flowi fl = { .oif = tunnel->parms.link, |
| 861 | .nl_u = { .ip4_u = |
| 862 | { .daddr = iph->daddr, |
| 863 | .saddr = iph->saddr, |
| 864 | .tos = RT_TOS(iph->tos) } }, |
| 865 | .proto = IPPROTO_GRE }; |
| 866 | struct rtable *rt; |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 867 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 868 | tdev = rt->u.dst.dev; |
| 869 | ip_rt_put(rt); |
| 870 | } |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 871 | |
| 872 | if (dev->type != ARPHRD_ETHER) |
| 873 | dev->flags |= IFF_POINTOPOINT; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 874 | } |
| 875 | |
| 876 | if (!tdev && tunnel->parms.link) |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 877 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 878 | |
| 879 | if (tdev) { |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 880 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 881 | mtu = tdev->mtu; |
| 882 | } |
| 883 | dev->iflink = tunnel->parms.link; |
| 884 | |
| 885 | /* Precalculate GRE options length */ |
| 886 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { |
| 887 | if (tunnel->parms.o_flags&GRE_CSUM) |
| 888 | addend += 4; |
| 889 | if (tunnel->parms.o_flags&GRE_KEY) |
| 890 | addend += 4; |
| 891 | if (tunnel->parms.o_flags&GRE_SEQ) |
| 892 | addend += 4; |
| 893 | } |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 894 | dev->needed_headroom = addend + hlen; |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 895 | mtu -= dev->hard_header_len - addend; |
| 896 | |
| 897 | if (mtu < 68) |
| 898 | mtu = 68; |
| 899 | |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 900 | tunnel->hlen = addend; |
| 901 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 902 | return mtu; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 903 | } |
| 904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | static int |
| 906 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) |
| 907 | { |
| 908 | int err = 0; |
| 909 | struct ip_tunnel_parm p; |
| 910 | struct ip_tunnel *t; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 911 | struct net *net = dev_net(dev); |
| 912 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
| 914 | switch (cmd) { |
| 915 | case SIOCGETTUNNEL: |
| 916 | t = NULL; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 917 | if (dev == ign->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| 919 | err = -EFAULT; |
| 920 | break; |
| 921 | } |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 922 | t = ipgre_tunnel_locate(net, &p, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | } |
| 924 | if (t == NULL) |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 925 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | memcpy(&p, &t->parms, sizeof(p)); |
| 927 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 928 | err = -EFAULT; |
| 929 | break; |
| 930 | |
| 931 | case SIOCADDTUNNEL: |
| 932 | case SIOCCHGTUNNEL: |
| 933 | err = -EPERM; |
| 934 | if (!capable(CAP_NET_ADMIN)) |
| 935 | goto done; |
| 936 | |
| 937 | err = -EFAULT; |
| 938 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 939 | goto done; |
| 940 | |
| 941 | err = -EINVAL; |
| 942 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || |
| 943 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || |
| 944 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) |
| 945 | goto done; |
| 946 | if (p.iph.ttl) |
| 947 | p.iph.frag_off |= htons(IP_DF); |
| 948 | |
| 949 | if (!(p.i_flags&GRE_KEY)) |
| 950 | p.i_key = 0; |
| 951 | if (!(p.o_flags&GRE_KEY)) |
| 952 | p.o_key = 0; |
| 953 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 954 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 956 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | if (t != NULL) { |
| 958 | if (t->dev != dev) { |
| 959 | err = -EEXIST; |
| 960 | break; |
| 961 | } |
| 962 | } else { |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 963 | unsigned nflags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 965 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 967 | if (ipv4_is_multicast(p.iph.daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | nflags = IFF_BROADCAST; |
| 969 | else if (p.iph.daddr) |
| 970 | nflags = IFF_POINTOPOINT; |
| 971 | |
| 972 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { |
| 973 | err = -EINVAL; |
| 974 | break; |
| 975 | } |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 976 | ipgre_tunnel_unlink(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | t->parms.iph.saddr = p.iph.saddr; |
| 978 | t->parms.iph.daddr = p.iph.daddr; |
| 979 | t->parms.i_key = p.i_key; |
| 980 | t->parms.o_key = p.o_key; |
| 981 | memcpy(dev->dev_addr, &p.iph.saddr, 4); |
| 982 | memcpy(dev->broadcast, &p.iph.daddr, 4); |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 983 | ipgre_tunnel_link(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | netdev_state_change(dev); |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | if (t) { |
| 989 | err = 0; |
| 990 | if (cmd == SIOCCHGTUNNEL) { |
| 991 | t->parms.iph.ttl = p.iph.ttl; |
| 992 | t->parms.iph.tos = p.iph.tos; |
| 993 | t->parms.iph.frag_off = p.iph.frag_off; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 994 | if (t->parms.link != p.link) { |
| 995 | t->parms.link = p.link; |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 996 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 997 | netdev_state_change(dev); |
| 998 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | } |
| 1000 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
| 1001 | err = -EFAULT; |
| 1002 | } else |
| 1003 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
| 1004 | break; |
| 1005 | |
| 1006 | case SIOCDELTUNNEL: |
| 1007 | err = -EPERM; |
| 1008 | if (!capable(CAP_NET_ADMIN)) |
| 1009 | goto done; |
| 1010 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1011 | if (dev == ign->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | err = -EFAULT; |
| 1013 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 1014 | goto done; |
| 1015 | err = -ENOENT; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 1016 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | goto done; |
| 1018 | err = -EPERM; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1019 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | goto done; |
| 1021 | dev = t->dev; |
| 1022 | } |
Stephen Hemminger | 22f8cde | 2007-02-07 00:09:58 -0800 | [diff] [blame] | 1023 | unregister_netdevice(dev); |
| 1024 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | break; |
| 1026 | |
| 1027 | default: |
| 1028 | err = -EINVAL; |
| 1029 | } |
| 1030 | |
| 1031 | done: |
| 1032 | return err; |
| 1033 | } |
| 1034 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
| 1036 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1037 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 1038 | if (new_mtu < 68 || |
| 1039 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | return -EINVAL; |
| 1041 | dev->mtu = new_mtu; |
| 1042 | return 0; |
| 1043 | } |
| 1044 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | /* Nice toy. Unfortunately, useless in real life :-) |
| 1046 | It allows to construct virtual multiprotocol broadcast "LAN" |
| 1047 | over the Internet, provided multicast routing is tuned. |
| 1048 | |
| 1049 | |
| 1050 | I have no idea was this bicycle invented before me, |
| 1051 | so that I had to set ARPHRD_IPGRE to a random value. |
| 1052 | I have an impression, that Cisco could make something similar, |
| 1053 | but this feature is apparently missing in IOS<=11.2(8). |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1054 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
| 1056 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) |
| 1057 | |
| 1058 | ping -t 255 224.66.66.66 |
| 1059 | |
| 1060 | If nobody answers, mbone does not work. |
| 1061 | |
| 1062 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 |
| 1063 | ip addr add 10.66.66.<somewhat>/24 dev Universe |
| 1064 | ifconfig Universe up |
| 1065 | ifconfig Universe add fe80::<Your_real_addr>/10 |
| 1066 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 |
| 1067 | ftp 10.66.66.66 |
| 1068 | ... |
| 1069 | ftp fec0:6666:6666::193.233.7.65 |
| 1070 | ... |
| 1071 | |
| 1072 | */ |
| 1073 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1074 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
| 1075 | unsigned short type, |
| 1076 | const void *daddr, const void *saddr, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1078 | struct ip_tunnel *t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 1080 | __be16 *p = (__be16*)(iph+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | |
| 1082 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
| 1083 | p[0] = t->parms.o_flags; |
| 1084 | p[1] = htons(type); |
| 1085 | |
| 1086 | /* |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1087 | * Set the source hardware address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1089 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | if (saddr) |
| 1091 | memcpy(&iph->saddr, saddr, 4); |
| 1092 | |
| 1093 | if (daddr) { |
| 1094 | memcpy(&iph->daddr, daddr, 4); |
| 1095 | return t->hlen; |
| 1096 | } |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1097 | if (iph->daddr && !ipv4_is_multicast(iph->daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | return t->hlen; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1099 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | return -t->hlen; |
| 1101 | } |
| 1102 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1103 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
| 1104 | { |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 1105 | struct iphdr *iph = (struct iphdr *) skb_mac_header(skb); |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1106 | memcpy(haddr, &iph->saddr, 4); |
| 1107 | return 4; |
| 1108 | } |
| 1109 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1110 | static const struct header_ops ipgre_header_ops = { |
| 1111 | .create = ipgre_header, |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1112 | .parse = ipgre_header_parse, |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1113 | }; |
| 1114 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1115 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | static int ipgre_open(struct net_device *dev) |
| 1117 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1118 | struct ip_tunnel *t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1120 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | struct flowi fl = { .oif = t->parms.link, |
| 1122 | .nl_u = { .ip4_u = |
| 1123 | { .daddr = t->parms.iph.daddr, |
| 1124 | .saddr = t->parms.iph.saddr, |
| 1125 | .tos = RT_TOS(t->parms.iph.tos) } }, |
| 1126 | .proto = IPPROTO_GRE }; |
| 1127 | struct rtable *rt; |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 1128 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | return -EADDRNOTAVAIL; |
| 1130 | dev = rt->u.dst.dev; |
| 1131 | ip_rt_put(rt); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1132 | if (__in_dev_get_rtnl(dev) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | return -EADDRNOTAVAIL; |
| 1134 | t->mlink = dev->ifindex; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1135 | 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] | 1136 | } |
| 1137 | return 0; |
| 1138 | } |
| 1139 | |
| 1140 | static int ipgre_close(struct net_device *dev) |
| 1141 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1142 | struct ip_tunnel *t = netdev_priv(dev); |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1143 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1144 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
Denis V. Lunev | 7fee0ca | 2008-01-21 17:32:38 -0800 | [diff] [blame] | 1145 | struct in_device *in_dev; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1146 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | if (in_dev) { |
| 1148 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
| 1149 | in_dev_put(in_dev); |
| 1150 | } |
| 1151 | } |
| 1152 | return 0; |
| 1153 | } |
| 1154 | |
| 1155 | #endif |
| 1156 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1157 | static const struct net_device_ops ipgre_netdev_ops = { |
| 1158 | .ndo_init = ipgre_tunnel_init, |
| 1159 | .ndo_uninit = ipgre_tunnel_uninit, |
| 1160 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
| 1161 | .ndo_open = ipgre_open, |
| 1162 | .ndo_stop = ipgre_close, |
| 1163 | #endif |
| 1164 | .ndo_start_xmit = ipgre_tunnel_xmit, |
| 1165 | .ndo_do_ioctl = ipgre_tunnel_ioctl, |
| 1166 | .ndo_change_mtu = ipgre_tunnel_change_mtu, |
| 1167 | }; |
| 1168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | static void ipgre_tunnel_setup(struct net_device *dev) |
| 1170 | { |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1171 | dev->netdev_ops = &ipgre_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | dev->destructor = free_netdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | |
| 1174 | dev->type = ARPHRD_IPGRE; |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 1175 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 1176 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | dev->flags = IFF_NOARP; |
| 1178 | dev->iflink = 0; |
| 1179 | dev->addr_len = 4; |
Pavel Emelyanov | 0b67ece | 2008-04-16 01:11:13 -0700 | [diff] [blame] | 1180 | dev->features |= NETIF_F_NETNS_LOCAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | } |
| 1182 | |
| 1183 | static int ipgre_tunnel_init(struct net_device *dev) |
| 1184 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | struct ip_tunnel *tunnel; |
| 1186 | struct iphdr *iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1188 | tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | iph = &tunnel->parms.iph; |
| 1190 | |
| 1191 | tunnel->dev = dev; |
| 1192 | strcpy(tunnel->parms.name, dev->name); |
| 1193 | |
| 1194 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); |
| 1195 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); |
| 1196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | if (iph->daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1199 | if (ipv4_is_multicast(iph->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | if (!iph->saddr) |
| 1201 | return -EINVAL; |
| 1202 | dev->flags = IFF_BROADCAST; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1203 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | } |
| 1205 | #endif |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1206 | } else |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1207 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | return 0; |
| 1210 | } |
| 1211 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1212 | static void ipgre_fb_tunnel_init(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1214 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | struct iphdr *iph = &tunnel->parms.iph; |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1216 | struct ipgre_net *ign = net_generic(dev_net(dev), ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | |
| 1218 | tunnel->dev = dev; |
| 1219 | strcpy(tunnel->parms.name, dev->name); |
| 1220 | |
| 1221 | iph->version = 4; |
| 1222 | iph->protocol = IPPROTO_GRE; |
| 1223 | iph->ihl = 5; |
| 1224 | tunnel->hlen = sizeof(struct iphdr) + 4; |
| 1225 | |
| 1226 | dev_hold(dev); |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1227 | ign->tunnels_wc[0] = tunnel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | } |
| 1229 | |
| 1230 | |
| 1231 | static struct net_protocol ipgre_protocol = { |
| 1232 | .handler = ipgre_rcv, |
| 1233 | .err_handler = ipgre_err, |
Pavel Emelyanov | f96c148 | 2008-04-16 01:11:36 -0700 | [diff] [blame] | 1234 | .netns_ok = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | }; |
| 1236 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1237 | static void ipgre_destroy_tunnels(struct ipgre_net *ign) |
| 1238 | { |
| 1239 | int prio; |
| 1240 | |
| 1241 | for (prio = 0; prio < 4; prio++) { |
| 1242 | int h; |
| 1243 | for (h = 0; h < HASH_SIZE; h++) { |
| 1244 | struct ip_tunnel *t; |
| 1245 | while ((t = ign->tunnels[prio][h]) != NULL) |
| 1246 | unregister_netdevice(t->dev); |
| 1247 | } |
| 1248 | } |
| 1249 | } |
| 1250 | |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1251 | static int ipgre_init_net(struct net *net) |
| 1252 | { |
| 1253 | int err; |
| 1254 | struct ipgre_net *ign; |
| 1255 | |
| 1256 | err = -ENOMEM; |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1257 | ign = kzalloc(sizeof(struct ipgre_net), GFP_KERNEL); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1258 | if (ign == NULL) |
| 1259 | goto err_alloc; |
| 1260 | |
| 1261 | err = net_assign_generic(net, ipgre_net_id, ign); |
| 1262 | if (err < 0) |
| 1263 | goto err_assign; |
| 1264 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1265 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
| 1266 | ipgre_tunnel_setup); |
| 1267 | if (!ign->fb_tunnel_dev) { |
| 1268 | err = -ENOMEM; |
| 1269 | goto err_alloc_dev; |
| 1270 | } |
| 1271 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1272 | ipgre_fb_tunnel_init(ign->fb_tunnel_dev); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1273 | dev_net_set(ign->fb_tunnel_dev, net); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1274 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1275 | |
| 1276 | if ((err = register_netdev(ign->fb_tunnel_dev))) |
| 1277 | goto err_reg_dev; |
| 1278 | |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1279 | return 0; |
| 1280 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1281 | err_reg_dev: |
| 1282 | free_netdev(ign->fb_tunnel_dev); |
| 1283 | err_alloc_dev: |
| 1284 | /* nothing */ |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1285 | err_assign: |
| 1286 | kfree(ign); |
| 1287 | err_alloc: |
| 1288 | return err; |
| 1289 | } |
| 1290 | |
| 1291 | static void ipgre_exit_net(struct net *net) |
| 1292 | { |
| 1293 | struct ipgre_net *ign; |
| 1294 | |
| 1295 | ign = net_generic(net, ipgre_net_id); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1296 | rtnl_lock(); |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1297 | ipgre_destroy_tunnels(ign); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1298 | rtnl_unlock(); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1299 | kfree(ign); |
| 1300 | } |
| 1301 | |
| 1302 | static struct pernet_operations ipgre_net_ops = { |
| 1303 | .init = ipgre_init_net, |
| 1304 | .exit = ipgre_exit_net, |
| 1305 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1307 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 1308 | { |
| 1309 | __be16 flags; |
| 1310 | |
| 1311 | if (!data) |
| 1312 | return 0; |
| 1313 | |
| 1314 | flags = 0; |
| 1315 | if (data[IFLA_GRE_IFLAGS]) |
| 1316 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 1317 | if (data[IFLA_GRE_OFLAGS]) |
| 1318 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 1319 | if (flags & (GRE_VERSION|GRE_ROUTING)) |
| 1320 | return -EINVAL; |
| 1321 | |
| 1322 | return 0; |
| 1323 | } |
| 1324 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1325 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 1326 | { |
| 1327 | __be32 daddr; |
| 1328 | |
| 1329 | if (tb[IFLA_ADDRESS]) { |
| 1330 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 1331 | return -EINVAL; |
| 1332 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 1333 | return -EADDRNOTAVAIL; |
| 1334 | } |
| 1335 | |
| 1336 | if (!data) |
| 1337 | goto out; |
| 1338 | |
| 1339 | if (data[IFLA_GRE_REMOTE]) { |
| 1340 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); |
| 1341 | if (!daddr) |
| 1342 | return -EINVAL; |
| 1343 | } |
| 1344 | |
| 1345 | out: |
| 1346 | return ipgre_tunnel_validate(tb, data); |
| 1347 | } |
| 1348 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1349 | static void ipgre_netlink_parms(struct nlattr *data[], |
| 1350 | struct ip_tunnel_parm *parms) |
| 1351 | { |
Herbert Xu | 7bb82d9 | 2008-10-11 12:20:15 -0700 | [diff] [blame] | 1352 | memset(parms, 0, sizeof(*parms)); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1353 | |
| 1354 | parms->iph.protocol = IPPROTO_GRE; |
| 1355 | |
| 1356 | if (!data) |
| 1357 | return; |
| 1358 | |
| 1359 | if (data[IFLA_GRE_LINK]) |
| 1360 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); |
| 1361 | |
| 1362 | if (data[IFLA_GRE_IFLAGS]) |
| 1363 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 1364 | |
| 1365 | if (data[IFLA_GRE_OFLAGS]) |
| 1366 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 1367 | |
| 1368 | if (data[IFLA_GRE_IKEY]) |
| 1369 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); |
| 1370 | |
| 1371 | if (data[IFLA_GRE_OKEY]) |
| 1372 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); |
| 1373 | |
| 1374 | if (data[IFLA_GRE_LOCAL]) |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1375 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1376 | |
| 1377 | if (data[IFLA_GRE_REMOTE]) |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1378 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1379 | |
| 1380 | if (data[IFLA_GRE_TTL]) |
| 1381 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); |
| 1382 | |
| 1383 | if (data[IFLA_GRE_TOS]) |
| 1384 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); |
| 1385 | |
| 1386 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) |
| 1387 | parms->iph.frag_off = htons(IP_DF); |
| 1388 | } |
| 1389 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1390 | static int ipgre_tap_init(struct net_device *dev) |
| 1391 | { |
| 1392 | struct ip_tunnel *tunnel; |
| 1393 | |
| 1394 | tunnel = netdev_priv(dev); |
| 1395 | |
| 1396 | tunnel->dev = dev; |
| 1397 | strcpy(tunnel->parms.name, dev->name); |
| 1398 | |
| 1399 | ipgre_tunnel_bind_dev(dev); |
| 1400 | |
| 1401 | return 0; |
| 1402 | } |
| 1403 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1404 | static const struct net_device_ops ipgre_tap_netdev_ops = { |
| 1405 | .ndo_init = ipgre_tap_init, |
| 1406 | .ndo_uninit = ipgre_tunnel_uninit, |
| 1407 | .ndo_start_xmit = ipgre_tunnel_xmit, |
| 1408 | .ndo_set_mac_address = eth_mac_addr, |
| 1409 | .ndo_validate_addr = eth_validate_addr, |
| 1410 | .ndo_change_mtu = ipgre_tunnel_change_mtu, |
| 1411 | }; |
| 1412 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1413 | static void ipgre_tap_setup(struct net_device *dev) |
| 1414 | { |
| 1415 | |
| 1416 | ether_setup(dev); |
| 1417 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1418 | dev->netdev_ops = &ipgre_netdev_ops; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1419 | dev->destructor = free_netdev; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1420 | |
| 1421 | dev->iflink = 0; |
| 1422 | dev->features |= NETIF_F_NETNS_LOCAL; |
| 1423 | } |
| 1424 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1425 | static int ipgre_newlink(struct net_device *dev, struct nlattr *tb[], |
| 1426 | struct nlattr *data[]) |
| 1427 | { |
| 1428 | struct ip_tunnel *nt; |
| 1429 | struct net *net = dev_net(dev); |
| 1430 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 1431 | int mtu; |
| 1432 | int err; |
| 1433 | |
| 1434 | nt = netdev_priv(dev); |
| 1435 | ipgre_netlink_parms(data, &nt->parms); |
| 1436 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1437 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1438 | return -EEXIST; |
| 1439 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1440 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
| 1441 | random_ether_addr(dev->dev_addr); |
| 1442 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1443 | mtu = ipgre_tunnel_bind_dev(dev); |
| 1444 | if (!tb[IFLA_MTU]) |
| 1445 | dev->mtu = mtu; |
| 1446 | |
| 1447 | err = register_netdevice(dev); |
| 1448 | if (err) |
| 1449 | goto out; |
| 1450 | |
| 1451 | dev_hold(dev); |
| 1452 | ipgre_tunnel_link(ign, nt); |
| 1453 | |
| 1454 | out: |
| 1455 | return err; |
| 1456 | } |
| 1457 | |
| 1458 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
| 1459 | struct nlattr *data[]) |
| 1460 | { |
| 1461 | struct ip_tunnel *t, *nt; |
| 1462 | struct net *net = dev_net(dev); |
| 1463 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 1464 | struct ip_tunnel_parm p; |
| 1465 | int mtu; |
| 1466 | |
| 1467 | if (dev == ign->fb_tunnel_dev) |
| 1468 | return -EINVAL; |
| 1469 | |
| 1470 | nt = netdev_priv(dev); |
| 1471 | ipgre_netlink_parms(data, &p); |
| 1472 | |
| 1473 | t = ipgre_tunnel_locate(net, &p, 0); |
| 1474 | |
| 1475 | if (t) { |
| 1476 | if (t->dev != dev) |
| 1477 | return -EEXIST; |
| 1478 | } else { |
| 1479 | unsigned nflags = 0; |
| 1480 | |
| 1481 | t = nt; |
| 1482 | |
| 1483 | if (ipv4_is_multicast(p.iph.daddr)) |
| 1484 | nflags = IFF_BROADCAST; |
| 1485 | else if (p.iph.daddr) |
| 1486 | nflags = IFF_POINTOPOINT; |
| 1487 | |
| 1488 | if ((dev->flags ^ nflags) & |
| 1489 | (IFF_POINTOPOINT | IFF_BROADCAST)) |
| 1490 | return -EINVAL; |
| 1491 | |
| 1492 | ipgre_tunnel_unlink(ign, t); |
| 1493 | t->parms.iph.saddr = p.iph.saddr; |
| 1494 | t->parms.iph.daddr = p.iph.daddr; |
| 1495 | t->parms.i_key = p.i_key; |
| 1496 | memcpy(dev->dev_addr, &p.iph.saddr, 4); |
| 1497 | memcpy(dev->broadcast, &p.iph.daddr, 4); |
| 1498 | ipgre_tunnel_link(ign, t); |
| 1499 | netdev_state_change(dev); |
| 1500 | } |
| 1501 | |
| 1502 | t->parms.o_key = p.o_key; |
| 1503 | t->parms.iph.ttl = p.iph.ttl; |
| 1504 | t->parms.iph.tos = p.iph.tos; |
| 1505 | t->parms.iph.frag_off = p.iph.frag_off; |
| 1506 | |
| 1507 | if (t->parms.link != p.link) { |
| 1508 | t->parms.link = p.link; |
| 1509 | mtu = ipgre_tunnel_bind_dev(dev); |
| 1510 | if (!tb[IFLA_MTU]) |
| 1511 | dev->mtu = mtu; |
| 1512 | netdev_state_change(dev); |
| 1513 | } |
| 1514 | |
| 1515 | return 0; |
| 1516 | } |
| 1517 | |
| 1518 | static size_t ipgre_get_size(const struct net_device *dev) |
| 1519 | { |
| 1520 | return |
| 1521 | /* IFLA_GRE_LINK */ |
| 1522 | nla_total_size(4) + |
| 1523 | /* IFLA_GRE_IFLAGS */ |
| 1524 | nla_total_size(2) + |
| 1525 | /* IFLA_GRE_OFLAGS */ |
| 1526 | nla_total_size(2) + |
| 1527 | /* IFLA_GRE_IKEY */ |
| 1528 | nla_total_size(4) + |
| 1529 | /* IFLA_GRE_OKEY */ |
| 1530 | nla_total_size(4) + |
| 1531 | /* IFLA_GRE_LOCAL */ |
| 1532 | nla_total_size(4) + |
| 1533 | /* IFLA_GRE_REMOTE */ |
| 1534 | nla_total_size(4) + |
| 1535 | /* IFLA_GRE_TTL */ |
| 1536 | nla_total_size(1) + |
| 1537 | /* IFLA_GRE_TOS */ |
| 1538 | nla_total_size(1) + |
| 1539 | /* IFLA_GRE_PMTUDISC */ |
| 1540 | nla_total_size(1) + |
| 1541 | 0; |
| 1542 | } |
| 1543 | |
| 1544 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 1545 | { |
| 1546 | struct ip_tunnel *t = netdev_priv(dev); |
| 1547 | struct ip_tunnel_parm *p = &t->parms; |
| 1548 | |
| 1549 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); |
| 1550 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); |
| 1551 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); |
Patrick McHardy | ba9e64b | 2008-10-10 12:10:30 -0700 | [diff] [blame] | 1552 | NLA_PUT_BE32(skb, IFLA_GRE_IKEY, p->i_key); |
| 1553 | NLA_PUT_BE32(skb, IFLA_GRE_OKEY, p->o_key); |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1554 | NLA_PUT_BE32(skb, IFLA_GRE_LOCAL, p->iph.saddr); |
| 1555 | NLA_PUT_BE32(skb, IFLA_GRE_REMOTE, p->iph.daddr); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1556 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); |
| 1557 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); |
| 1558 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); |
| 1559 | |
| 1560 | return 0; |
| 1561 | |
| 1562 | nla_put_failure: |
| 1563 | return -EMSGSIZE; |
| 1564 | } |
| 1565 | |
| 1566 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
| 1567 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, |
| 1568 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
| 1569 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
| 1570 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
| 1571 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1572 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
| 1573 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1574 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
| 1575 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, |
| 1576 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, |
| 1577 | }; |
| 1578 | |
| 1579 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { |
| 1580 | .kind = "gre", |
| 1581 | .maxtype = IFLA_GRE_MAX, |
| 1582 | .policy = ipgre_policy, |
| 1583 | .priv_size = sizeof(struct ip_tunnel), |
| 1584 | .setup = ipgre_tunnel_setup, |
| 1585 | .validate = ipgre_tunnel_validate, |
| 1586 | .newlink = ipgre_newlink, |
| 1587 | .changelink = ipgre_changelink, |
| 1588 | .get_size = ipgre_get_size, |
| 1589 | .fill_info = ipgre_fill_info, |
| 1590 | }; |
| 1591 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1592 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
| 1593 | .kind = "gretap", |
| 1594 | .maxtype = IFLA_GRE_MAX, |
| 1595 | .policy = ipgre_policy, |
| 1596 | .priv_size = sizeof(struct ip_tunnel), |
| 1597 | .setup = ipgre_tap_setup, |
| 1598 | .validate = ipgre_tap_validate, |
| 1599 | .newlink = ipgre_newlink, |
| 1600 | .changelink = ipgre_changelink, |
| 1601 | .get_size = ipgre_get_size, |
| 1602 | .fill_info = ipgre_fill_info, |
| 1603 | }; |
| 1604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | /* |
| 1606 | * And now the modules code and kernel interface. |
| 1607 | */ |
| 1608 | |
| 1609 | static int __init ipgre_init(void) |
| 1610 | { |
| 1611 | int err; |
| 1612 | |
| 1613 | printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); |
| 1614 | |
| 1615 | if (inet_add_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) { |
| 1616 | printk(KERN_INFO "ipgre init: can't add protocol\n"); |
| 1617 | return -EAGAIN; |
| 1618 | } |
| 1619 | |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1620 | err = register_pernet_gen_device(&ipgre_net_id, &ipgre_net_ops); |
| 1621 | if (err < 0) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1622 | goto gen_device_failed; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1623 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1624 | err = rtnl_link_register(&ipgre_link_ops); |
| 1625 | if (err < 0) |
| 1626 | goto rtnl_link_failed; |
| 1627 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1628 | err = rtnl_link_register(&ipgre_tap_ops); |
| 1629 | if (err < 0) |
| 1630 | goto tap_ops_failed; |
| 1631 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1632 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | return err; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1634 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1635 | tap_ops_failed: |
| 1636 | rtnl_link_unregister(&ipgre_link_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1637 | rtnl_link_failed: |
| 1638 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); |
| 1639 | gen_device_failed: |
| 1640 | inet_del_protocol(&ipgre_protocol, IPPROTO_GRE); |
| 1641 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | } |
| 1643 | |
Alexey Kuznetsov | db44575 | 2005-07-30 17:46:44 -0700 | [diff] [blame] | 1644 | static void __exit ipgre_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1646 | rtnl_link_unregister(&ipgre_tap_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1647 | rtnl_link_unregister(&ipgre_link_ops); |
| 1648 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | if (inet_del_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) |
| 1650 | printk(KERN_INFO "ipgre close: can't remove protocol\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | } |
| 1652 | |
| 1653 | module_init(ipgre_init); |
| 1654 | module_exit(ipgre_fini); |
| 1655 | MODULE_LICENSE("GPL"); |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1656 | MODULE_ALIAS_RTNL_LINK("gre"); |
| 1657 | MODULE_ALIAS_RTNL_LINK("gretap"); |