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> |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 30 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #include <net/sock.h> |
| 33 | #include <net/ip.h> |
| 34 | #include <net/icmp.h> |
| 35 | #include <net/protocol.h> |
| 36 | #include <net/ipip.h> |
| 37 | #include <net/arp.h> |
| 38 | #include <net/checksum.h> |
| 39 | #include <net/dsfield.h> |
| 40 | #include <net/inet_ecn.h> |
| 41 | #include <net/xfrm.h> |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 42 | #include <net/net_namespace.h> |
| 43 | #include <net/netns/generic.h> |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 44 | #include <net/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | #ifdef CONFIG_IPV6 |
| 47 | #include <net/ipv6.h> |
| 48 | #include <net/ip6_fib.h> |
| 49 | #include <net/ip6_route.h> |
| 50 | #endif |
| 51 | |
| 52 | /* |
| 53 | Problems & solutions |
| 54 | -------------------- |
| 55 | |
| 56 | 1. The most important issue is detecting local dead loops. |
| 57 | They would cause complete host lockup in transmit, which |
| 58 | would be "resolved" by stack overflow or, if queueing is enabled, |
| 59 | with infinite looping in net_bh. |
| 60 | |
| 61 | We cannot track such dead loops during route installation, |
| 62 | it is infeasible task. The most general solutions would be |
| 63 | to keep skb->encapsulation counter (sort of local ttl), |
| 64 | and silently drop packet when it expires. It is the best |
| 65 | solution, but it supposes maintaing new variable in ALL |
| 66 | skb, even if no tunneling is used. |
| 67 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 68 | Current solution: t->recursion lock breaks dead loops. It looks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | like dev->tbusy flag, but I preferred new variable, because |
| 70 | the semantics is different. One day, when hard_start_xmit |
| 71 | will be multithreaded we will have to use skb->encapsulation. |
| 72 | |
| 73 | |
| 74 | |
| 75 | 2. Networking dead loops would not kill routers, but would really |
| 76 | kill network. IP hop limit plays role of "t->recursion" in this case, |
| 77 | if we copy it from packet being encapsulated to upper header. |
| 78 | It is very good solution, but it introduces two problems: |
| 79 | |
| 80 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), |
| 81 | do not work over tunnels. |
| 82 | - traceroute does not work. I planned to relay ICMP from tunnel, |
| 83 | so that this problem would be solved and traceroute output |
| 84 | would even more informative. This idea appeared to be wrong: |
| 85 | only Linux complies to rfc1812 now (yes, guys, Linux is the only |
| 86 | true router now :-)), all routers (at least, in neighbourhood of mine) |
| 87 | return only 8 bytes of payload. It is the end. |
| 88 | |
| 89 | Hence, if we want that OSPF worked or traceroute said something reasonable, |
| 90 | we should search for another solution. |
| 91 | |
| 92 | One of them is to parse packet trying to detect inner encapsulation |
| 93 | made by our node. It is difficult or even impossible, especially, |
| 94 | taking into account fragmentation. TO be short, tt is not solution at all. |
| 95 | |
| 96 | Current solution: The solution was UNEXPECTEDLY SIMPLE. |
| 97 | We force DF flag on tunnels with preconfigured hop limit, |
| 98 | that is ALL. :-) Well, it does not remove the problem completely, |
| 99 | but exponential growth of network traffic is changed to linear |
| 100 | (branches, that exceed pmtu are pruned) and tunnel mtu |
| 101 | fastly degrades to value <68, where looping stops. |
| 102 | Yes, it is not good if there exists a router in the loop, |
| 103 | which does not force DF, even when encapsulating packets have DF set. |
| 104 | But it is not our problem! Nobody could accuse us, we made |
| 105 | all that we could make. Even if it is your gated who injected |
| 106 | fatal route to network, even if it were you who configured |
| 107 | fatal static route: you are innocent. :-) |
| 108 | |
| 109 | |
| 110 | |
| 111 | 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain |
| 112 | practically identical code. It would be good to glue them |
| 113 | together, but it is not very evident, how to make them modular. |
| 114 | sit is integral part of IPv6, ipip and gre are naturally modular. |
| 115 | We could extract common parts (hash table, ioctl etc) |
| 116 | to a separate module (ip_tunnel.c). |
| 117 | |
| 118 | Alexey Kuznetsov. |
| 119 | */ |
| 120 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 121 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | static int ipgre_tunnel_init(struct net_device *dev); |
| 123 | static void ipgre_tunnel_setup(struct net_device *dev); |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 124 | static int ipgre_tunnel_bind_dev(struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
| 126 | /* Fallback tunnel: no source, no destination, no key, no options */ |
| 127 | |
| 128 | static int ipgre_fb_tunnel_init(struct net_device *dev); |
| 129 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 130 | #define HASH_SIZE 16 |
| 131 | |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 132 | static int ipgre_net_id; |
| 133 | struct ipgre_net { |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 134 | struct ip_tunnel *tunnels[4][HASH_SIZE]; |
| 135 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 136 | struct net_device *fb_tunnel_dev; |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 137 | }; |
| 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | /* Tunnel hash table */ |
| 140 | |
| 141 | /* |
| 142 | 4 hash tables: |
| 143 | |
| 144 | 3: (remote,local) |
| 145 | 2: (remote,*) |
| 146 | 1: (*,local) |
| 147 | 0: (*,*) |
| 148 | |
| 149 | We require exact key match i.e. if a key is present in packet |
| 150 | it will match only tunnel with the same key; if it is not present, |
| 151 | it will match only keyless tunnel. |
| 152 | |
| 153 | All keysless packets, if not matched configured keyless tunnels |
| 154 | will match fallback tunnel. |
| 155 | */ |
| 156 | |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 157 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 159 | #define tunnels_r_l tunnels[3] |
| 160 | #define tunnels_r tunnels[2] |
| 161 | #define tunnels_l tunnels[1] |
| 162 | #define tunnels_wc tunnels[0] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
| 164 | static DEFINE_RWLOCK(ipgre_lock); |
| 165 | |
| 166 | /* Given src, dst and key, find appropriate for input tunnel. */ |
| 167 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 168 | static struct ip_tunnel * ipgre_tunnel_lookup(struct net *net, |
| 169 | __be32 remote, __be32 local, __be32 key) |
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; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 174 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 176 | for (t = ign->tunnels_r_l[h0^h1]; t; t = t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) { |
| 178 | if (t->parms.i_key == key && (t->dev->flags&IFF_UP)) |
| 179 | return t; |
| 180 | } |
| 181 | } |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 182 | for (t = ign->tunnels_r[h0^h1]; t; t = t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | if (remote == t->parms.iph.daddr) { |
| 184 | if (t->parms.i_key == key && (t->dev->flags&IFF_UP)) |
| 185 | return t; |
| 186 | } |
| 187 | } |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 188 | for (t = ign->tunnels_l[h1]; t; t = t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | if (local == t->parms.iph.saddr || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 190 | (local == t->parms.iph.daddr && |
| 191 | ipv4_is_multicast(local))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | if (t->parms.i_key == key && (t->dev->flags&IFF_UP)) |
| 193 | return t; |
| 194 | } |
| 195 | } |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 196 | for (t = ign->tunnels_wc[h1]; t; t = t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | if (t->parms.i_key == key && (t->dev->flags&IFF_UP)) |
| 198 | return t; |
| 199 | } |
| 200 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 201 | if (ign->fb_tunnel_dev->flags&IFF_UP) |
| 202 | return netdev_priv(ign->fb_tunnel_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | return NULL; |
| 204 | } |
| 205 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 206 | static struct ip_tunnel **__ipgre_bucket(struct ipgre_net *ign, |
| 207 | struct ip_tunnel_parm *parms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | { |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 209 | __be32 remote = parms->iph.daddr; |
| 210 | __be32 local = parms->iph.saddr; |
| 211 | __be32 key = parms->i_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | unsigned h = HASH(key); |
| 213 | int prio = 0; |
| 214 | |
| 215 | if (local) |
| 216 | prio |= 1; |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 217 | if (remote && !ipv4_is_multicast(remote)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | prio |= 2; |
| 219 | h ^= HASH(remote); |
| 220 | } |
| 221 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 222 | return &ign->tunnels[prio][h]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
| 224 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 225 | static inline struct ip_tunnel **ipgre_bucket(struct ipgre_net *ign, |
| 226 | struct ip_tunnel *t) |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 227 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 228 | return __ipgre_bucket(ign, &t->parms); |
YOSHIFUJI Hideaki | 5056a1e | 2007-04-24 20:44:48 +0900 | [diff] [blame] | 229 | } |
| 230 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 231 | 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] | 232 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 233 | struct ip_tunnel **tp = ipgre_bucket(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
| 235 | t->next = *tp; |
| 236 | write_lock_bh(&ipgre_lock); |
| 237 | *tp = t; |
| 238 | write_unlock_bh(&ipgre_lock); |
| 239 | } |
| 240 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 241 | 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] | 242 | { |
| 243 | struct ip_tunnel **tp; |
| 244 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 245 | for (tp = ipgre_bucket(ign, t); *tp; tp = &(*tp)->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | if (t == *tp) { |
| 247 | write_lock_bh(&ipgre_lock); |
| 248 | *tp = t->next; |
| 249 | write_unlock_bh(&ipgre_lock); |
| 250 | break; |
| 251 | } |
| 252 | } |
| 253 | } |
| 254 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 255 | static struct ip_tunnel * ipgre_tunnel_locate(struct net *net, |
| 256 | struct ip_tunnel_parm *parms, int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 258 | __be32 remote = parms->iph.daddr; |
| 259 | __be32 local = parms->iph.saddr; |
| 260 | __be32 key = parms->i_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | struct ip_tunnel *t, **tp, *nt; |
| 262 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | char name[IFNAMSIZ]; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 264 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 266 | for (tp = __ipgre_bucket(ign, parms); (t = *tp) != NULL; tp = &t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) { |
| 268 | if (key == t->parms.i_key) |
| 269 | return t; |
| 270 | } |
| 271 | } |
| 272 | if (!create) |
| 273 | return NULL; |
| 274 | |
| 275 | if (parms->name[0]) |
| 276 | strlcpy(name, parms->name, IFNAMSIZ); |
Pavel Emelyanov | 34cc7ba | 2008-02-23 20:19:20 -0800 | [diff] [blame] | 277 | else |
| 278 | sprintf(name, "gre%%d"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
| 280 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); |
| 281 | if (!dev) |
| 282 | return NULL; |
| 283 | |
Pavel Emelyanov | 0b67ece | 2008-04-16 01:11:13 -0700 | [diff] [blame] | 284 | dev_net_set(dev, net); |
| 285 | |
Pavel Emelyanov | b37d428b | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 286 | if (strchr(name, '%')) { |
| 287 | if (dev_alloc_name(dev, name) < 0) |
| 288 | goto failed_free; |
| 289 | } |
| 290 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 291 | nt = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | nt->parms = *parms; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 293 | dev->rtnl_link_ops = &ipgre_link_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 295 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
| 296 | |
Pavel Emelyanov | b37d428b | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 297 | if (register_netdevice(dev) < 0) |
| 298 | goto failed_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | dev_hold(dev); |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 301 | ipgre_tunnel_link(ign, nt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | return nt; |
| 303 | |
Pavel Emelyanov | b37d428b | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 304 | failed_free: |
| 305 | free_netdev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | return NULL; |
| 307 | } |
| 308 | |
| 309 | static void ipgre_tunnel_uninit(struct net_device *dev) |
| 310 | { |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 311 | struct net *net = dev_net(dev); |
| 312 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 313 | |
| 314 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | dev_put(dev); |
| 316 | } |
| 317 | |
| 318 | |
| 319 | static void ipgre_err(struct sk_buff *skb, u32 info) |
| 320 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
Rami Rosen | 071f92d | 2008-05-21 17:47:54 -0700 | [diff] [blame] | 322 | /* All the routers (except for Linux) return only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | 8 bytes of packet payload. It means, that precise relaying of |
| 324 | ICMP in the real Internet is absolutely infeasible. |
| 325 | |
| 326 | Moreover, Cisco "wise men" put GRE key to the third word |
| 327 | in GRE header. It makes impossible maintaining even soft state for keyed |
| 328 | GRE tunnels with enabled checksum. Tell them "thank you". |
| 329 | |
| 330 | Well, I wonder, rfc1812 was written by Cisco employee, |
| 331 | what the hell these idiots break standrads established |
| 332 | by themself??? |
| 333 | */ |
| 334 | |
| 335 | struct iphdr *iph = (struct iphdr*)skb->data; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 336 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | int grehlen = (iph->ihl<<2) + 4; |
Arnaldo Carvalho de Melo | 88c7664 | 2007-03-13 14:43:18 -0300 | [diff] [blame] | 338 | const int type = icmp_hdr(skb)->type; |
| 339 | const int code = icmp_hdr(skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | struct ip_tunnel *t; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 341 | __be16 flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
| 343 | flags = p[0]; |
| 344 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { |
| 345 | if (flags&(GRE_VERSION|GRE_ROUTING)) |
| 346 | return; |
| 347 | if (flags&GRE_KEY) { |
| 348 | grehlen += 4; |
| 349 | if (flags&GRE_CSUM) |
| 350 | grehlen += 4; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | /* If only 8 bytes returned, keyed message will be dropped here */ |
| 355 | if (skb_headlen(skb) < grehlen) |
| 356 | return; |
| 357 | |
| 358 | switch (type) { |
| 359 | default: |
| 360 | case ICMP_PARAMETERPROB: |
| 361 | return; |
| 362 | |
| 363 | case ICMP_DEST_UNREACH: |
| 364 | switch (code) { |
| 365 | case ICMP_SR_FAILED: |
| 366 | case ICMP_PORT_UNREACH: |
| 367 | /* Impossible event. */ |
| 368 | return; |
| 369 | case ICMP_FRAG_NEEDED: |
| 370 | /* Soft state for pmtu is maintained by IP core. */ |
| 371 | return; |
| 372 | default: |
| 373 | /* All others are translated to HOST_UNREACH. |
| 374 | rfc2003 contains "deep thoughts" about NET_UNREACH, |
| 375 | I believe they are just ether pollution. --ANK |
| 376 | */ |
| 377 | break; |
| 378 | } |
| 379 | break; |
| 380 | case ICMP_TIME_EXCEEDED: |
| 381 | if (code != ICMP_EXC_TTL) |
| 382 | return; |
| 383 | break; |
| 384 | } |
| 385 | |
| 386 | read_lock(&ipgre_lock); |
Pavel Emelyanov | 3b4667f | 2008-04-16 01:09:44 -0700 | [diff] [blame] | 387 | t = ipgre_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr, |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 388 | (flags&GRE_KEY) ? |
| 389 | *(((__be32*)p) + (grehlen>>2) - 1) : 0); |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 390 | if (t == NULL || t->parms.iph.daddr == 0 || |
| 391 | ipv4_is_multicast(t->parms.iph.daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | goto out; |
| 393 | |
| 394 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
| 395 | goto out; |
| 396 | |
| 397 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) |
| 398 | t->err_count++; |
| 399 | else |
| 400 | t->err_count = 1; |
| 401 | t->err_time = jiffies; |
| 402 | out: |
| 403 | read_unlock(&ipgre_lock); |
| 404 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | static inline void ipgre_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) |
| 408 | { |
| 409 | if (INET_ECN_is_ce(iph->tos)) { |
| 410 | if (skb->protocol == htons(ETH_P_IP)) { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 411 | IP_ECN_set_ce(ip_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 413 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | } |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | static inline u8 |
| 419 | ipgre_ecn_encapsulate(u8 tos, struct iphdr *old_iph, struct sk_buff *skb) |
| 420 | { |
| 421 | u8 inner = 0; |
| 422 | if (skb->protocol == htons(ETH_P_IP)) |
| 423 | inner = old_iph->tos; |
| 424 | else if (skb->protocol == htons(ETH_P_IPV6)) |
| 425 | inner = ipv6_get_dsfield((struct ipv6hdr *)old_iph); |
| 426 | return INET_ECN_encapsulate(tos, inner); |
| 427 | } |
| 428 | |
| 429 | static int ipgre_rcv(struct sk_buff *skb) |
| 430 | { |
| 431 | struct iphdr *iph; |
| 432 | u8 *h; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 433 | __be16 flags; |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 434 | __sum16 csum = 0; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 435 | __be32 key = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | u32 seqno = 0; |
| 437 | struct ip_tunnel *tunnel; |
| 438 | int offset = 4; |
| 439 | |
| 440 | if (!pskb_may_pull(skb, 16)) |
| 441 | goto drop_nolock; |
| 442 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 443 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | h = skb->data; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 445 | flags = *(__be16*)h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { |
| 448 | /* - Version must be 0. |
| 449 | - We do not support routing headers. |
| 450 | */ |
| 451 | if (flags&(GRE_VERSION|GRE_ROUTING)) |
| 452 | goto drop_nolock; |
| 453 | |
| 454 | if (flags&GRE_CSUM) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 455 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 456 | case CHECKSUM_COMPLETE: |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 457 | csum = csum_fold(skb->csum); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 458 | if (!csum) |
| 459 | break; |
| 460 | /* fall through */ |
| 461 | case CHECKSUM_NONE: |
| 462 | skb->csum = 0; |
| 463 | csum = __skb_checksum_complete(skb); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 464 | skb->ip_summed = CHECKSUM_COMPLETE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | } |
| 466 | offset += 4; |
| 467 | } |
| 468 | if (flags&GRE_KEY) { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 469 | key = *(__be32*)(h + offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | offset += 4; |
| 471 | } |
| 472 | if (flags&GRE_SEQ) { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 473 | seqno = ntohl(*(__be32*)(h + offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | offset += 4; |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | read_lock(&ipgre_lock); |
Pavel Emelyanov | 3b4667f | 2008-04-16 01:09:44 -0700 | [diff] [blame] | 479 | if ((tunnel = ipgre_tunnel_lookup(dev_net(skb->dev), |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 480 | iph->saddr, iph->daddr, key)) != NULL) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 481 | struct net_device_stats *stats = &tunnel->dev->stats; |
| 482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | secpath_reset(skb); |
| 484 | |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 485 | skb->protocol = *(__be16*)(h + 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | /* WCCP version 1 and 2 protocol decoding. |
| 487 | * - Change protocol to IP |
| 488 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header |
| 489 | */ |
| 490 | if (flags == 0 && |
YOSHIFUJI Hideaki | 496c98d | 2006-10-10 19:41:21 -0700 | [diff] [blame] | 491 | skb->protocol == htons(ETH_P_WCCP)) { |
| 492 | skb->protocol = htons(ETH_P_IP); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 493 | if ((*(h + offset) & 0xF0) != 0x40) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | offset += 4; |
| 495 | } |
| 496 | |
Timo Teras | 1d06916 | 2007-12-20 00:10:33 -0800 | [diff] [blame] | 497 | skb->mac_header = skb->network_header; |
Arnaldo Carvalho de Melo | 4209fb6 | 2007-03-10 18:42:03 -0300 | [diff] [blame] | 498 | __pskb_pull(skb, offset); |
| 499 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 500 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | skb->pkt_type = PACKET_HOST; |
| 502 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 503 | if (ipv4_is_multicast(iph->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | /* Looped back packet, drop it! */ |
Eric Dumazet | ee6b967 | 2008-03-05 18:30:47 -0800 | [diff] [blame] | 505 | if (skb->rtable->fl.iif == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | goto drop; |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 507 | stats->multicast++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | skb->pkt_type = PACKET_BROADCAST; |
| 509 | } |
| 510 | #endif |
| 511 | |
| 512 | if (((flags&GRE_CSUM) && csum) || |
| 513 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 514 | stats->rx_crc_errors++; |
| 515 | stats->rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | goto drop; |
| 517 | } |
| 518 | if (tunnel->parms.i_flags&GRE_SEQ) { |
| 519 | if (!(flags&GRE_SEQ) || |
| 520 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 521 | stats->rx_fifo_errors++; |
| 522 | stats->rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | goto drop; |
| 524 | } |
| 525 | tunnel->i_seqno = seqno + 1; |
| 526 | } |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 527 | stats->rx_packets++; |
| 528 | stats->rx_bytes += skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | skb->dev = tunnel->dev; |
| 530 | dst_release(skb->dst); |
| 531 | skb->dst = NULL; |
| 532 | nf_reset(skb); |
| 533 | ipgre_ecn_decapsulate(iph, skb); |
| 534 | netif_rx(skb); |
| 535 | read_unlock(&ipgre_lock); |
| 536 | return(0); |
| 537 | } |
Herbert Xu | 45af08b | 2006-04-05 22:31:19 -0700 | [diff] [blame] | 538 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
| 540 | drop: |
| 541 | read_unlock(&ipgre_lock); |
| 542 | drop_nolock: |
| 543 | kfree_skb(skb); |
| 544 | return(0); |
| 545 | } |
| 546 | |
| 547 | static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
| 548 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 549 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 550 | struct net_device_stats *stats = &tunnel->dev->stats; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 551 | struct iphdr *old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | struct iphdr *tiph; |
| 553 | u8 tos; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 554 | __be16 df; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | struct rtable *rt; /* Route to the other host */ |
| 556 | struct net_device *tdev; /* Device to other host */ |
| 557 | struct iphdr *iph; /* Our new IP header */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 558 | unsigned int max_headroom; /* The extra header space needed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | int gre_hlen; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 560 | __be32 dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | int mtu; |
| 562 | |
| 563 | if (tunnel->recursion++) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 564 | stats->collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | goto tx_error; |
| 566 | } |
| 567 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 568 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | gre_hlen = 0; |
| 570 | tiph = (struct iphdr*)skb->data; |
| 571 | } else { |
| 572 | gre_hlen = tunnel->hlen; |
| 573 | tiph = &tunnel->parms.iph; |
| 574 | } |
| 575 | |
| 576 | if ((dst = tiph->daddr) == 0) { |
| 577 | /* NBMA tunnel */ |
| 578 | |
| 579 | if (skb->dst == NULL) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 580 | stats->tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | goto tx_error; |
| 582 | } |
| 583 | |
| 584 | if (skb->protocol == htons(ETH_P_IP)) { |
Eric Dumazet | ee6b967 | 2008-03-05 18:30:47 -0800 | [diff] [blame] | 585 | rt = skb->rtable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | if ((dst = rt->rt_gateway) == 0) |
| 587 | goto tx_error_icmp; |
| 588 | } |
| 589 | #ifdef CONFIG_IPV6 |
| 590 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
| 591 | struct in6_addr *addr6; |
| 592 | int addr_type; |
| 593 | struct neighbour *neigh = skb->dst->neighbour; |
| 594 | |
| 595 | if (neigh == NULL) |
| 596 | goto tx_error; |
| 597 | |
| 598 | addr6 = (struct in6_addr*)&neigh->primary_key; |
| 599 | addr_type = ipv6_addr_type(addr6); |
| 600 | |
| 601 | if (addr_type == IPV6_ADDR_ANY) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 602 | addr6 = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | addr_type = ipv6_addr_type(addr6); |
| 604 | } |
| 605 | |
| 606 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) |
| 607 | goto tx_error_icmp; |
| 608 | |
| 609 | dst = addr6->s6_addr32[3]; |
| 610 | } |
| 611 | #endif |
| 612 | else |
| 613 | goto tx_error; |
| 614 | } |
| 615 | |
| 616 | tos = tiph->tos; |
| 617 | if (tos&1) { |
| 618 | if (skb->protocol == htons(ETH_P_IP)) |
| 619 | tos = old_iph->tos; |
| 620 | tos &= ~1; |
| 621 | } |
| 622 | |
| 623 | { |
| 624 | struct flowi fl = { .oif = tunnel->parms.link, |
| 625 | .nl_u = { .ip4_u = |
| 626 | { .daddr = dst, |
| 627 | .saddr = tiph->saddr, |
| 628 | .tos = RT_TOS(tos) } }, |
| 629 | .proto = IPPROTO_GRE }; |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 630 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 631 | stats->tx_carrier_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | goto tx_error; |
| 633 | } |
| 634 | } |
| 635 | tdev = rt->u.dst.dev; |
| 636 | |
| 637 | if (tdev == dev) { |
| 638 | ip_rt_put(rt); |
Pavel Emelyanov | addd68e | 2008-05-21 14:14:22 -0700 | [diff] [blame] | 639 | stats->collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | goto tx_error; |
| 641 | } |
| 642 | |
| 643 | df = tiph->frag_off; |
| 644 | if (df) |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 645 | mtu = dst_mtu(&rt->u.dst) - dev->hard_header_len - tunnel->hlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | else |
| 647 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; |
| 648 | |
| 649 | if (skb->dst) |
| 650 | skb->dst->ops->update_pmtu(skb->dst, mtu); |
| 651 | |
| 652 | if (skb->protocol == htons(ETH_P_IP)) { |
| 653 | df |= (old_iph->frag_off&htons(IP_DF)); |
| 654 | |
| 655 | if ((old_iph->frag_off&htons(IP_DF)) && |
| 656 | mtu < ntohs(old_iph->tot_len)) { |
| 657 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
| 658 | ip_rt_put(rt); |
| 659 | goto tx_error; |
| 660 | } |
| 661 | } |
| 662 | #ifdef CONFIG_IPV6 |
| 663 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
| 664 | struct rt6_info *rt6 = (struct rt6_info*)skb->dst; |
| 665 | |
| 666 | if (rt6 && mtu < dst_mtu(skb->dst) && mtu >= IPV6_MIN_MTU) { |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 667 | if ((tunnel->parms.iph.daddr && |
| 668 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | rt6->rt6i_dst.plen == 128) { |
| 670 | rt6->rt6i_flags |= RTF_MODIFIED; |
| 671 | skb->dst->metrics[RTAX_MTU-1] = mtu; |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { |
| 676 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); |
| 677 | ip_rt_put(rt); |
| 678 | goto tx_error; |
| 679 | } |
| 680 | } |
| 681 | #endif |
| 682 | |
| 683 | if (tunnel->err_count > 0) { |
| 684 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { |
| 685 | tunnel->err_count--; |
| 686 | |
| 687 | dst_link_failure(skb); |
| 688 | } else |
| 689 | tunnel->err_count = 0; |
| 690 | } |
| 691 | |
| 692 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen; |
| 693 | |
Patrick McHardy | cfbba49 | 2007-07-09 15:33:40 -0700 | [diff] [blame] | 694 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
| 695 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
| 697 | if (!new_skb) { |
| 698 | ip_rt_put(rt); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 699 | stats->tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | dev_kfree_skb(skb); |
| 701 | tunnel->recursion--; |
| 702 | return 0; |
| 703 | } |
| 704 | if (skb->sk) |
| 705 | skb_set_owner_w(new_skb, skb->sk); |
| 706 | dev_kfree_skb(skb); |
| 707 | skb = new_skb; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 708 | old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } |
| 710 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 711 | skb->transport_header = skb->network_header; |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 712 | skb_push(skb, gre_hlen); |
| 713 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
Patrick McHardy | 48d5cad | 2006-02-15 15:10:22 -0800 | [diff] [blame] | 715 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
| 716 | IPSKB_REROUTED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | dst_release(skb->dst); |
| 718 | skb->dst = &rt->u.dst; |
| 719 | |
| 720 | /* |
| 721 | * Push down and install the IPIP header. |
| 722 | */ |
| 723 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 724 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | iph->version = 4; |
| 726 | iph->ihl = sizeof(struct iphdr) >> 2; |
| 727 | iph->frag_off = df; |
| 728 | iph->protocol = IPPROTO_GRE; |
| 729 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); |
| 730 | iph->daddr = rt->rt_dst; |
| 731 | iph->saddr = rt->rt_src; |
| 732 | |
| 733 | if ((iph->ttl = tiph->ttl) == 0) { |
| 734 | if (skb->protocol == htons(ETH_P_IP)) |
| 735 | iph->ttl = old_iph->ttl; |
| 736 | #ifdef CONFIG_IPV6 |
| 737 | else if (skb->protocol == htons(ETH_P_IPV6)) |
| 738 | iph->ttl = ((struct ipv6hdr*)old_iph)->hop_limit; |
| 739 | #endif |
| 740 | else |
| 741 | iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT); |
| 742 | } |
| 743 | |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 744 | ((__be16*)(iph+1))[0] = tunnel->parms.o_flags; |
| 745 | ((__be16*)(iph+1))[1] = skb->protocol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
| 747 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 748 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
| 750 | if (tunnel->parms.o_flags&GRE_SEQ) { |
| 751 | ++tunnel->o_seqno; |
| 752 | *ptr = htonl(tunnel->o_seqno); |
| 753 | ptr--; |
| 754 | } |
| 755 | if (tunnel->parms.o_flags&GRE_KEY) { |
| 756 | *ptr = tunnel->parms.o_key; |
| 757 | ptr--; |
| 758 | } |
| 759 | if (tunnel->parms.o_flags&GRE_CSUM) { |
| 760 | *ptr = 0; |
Al Viro | 5f92a73 | 2006-11-14 21:36:54 -0800 | [diff] [blame] | 761 | *(__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] | 762 | } |
| 763 | } |
| 764 | |
| 765 | nf_reset(skb); |
| 766 | |
| 767 | IPTUNNEL_XMIT(); |
| 768 | tunnel->recursion--; |
| 769 | return 0; |
| 770 | |
| 771 | tx_error_icmp: |
| 772 | dst_link_failure(skb); |
| 773 | |
| 774 | tx_error: |
| 775 | stats->tx_errors++; |
| 776 | dev_kfree_skb(skb); |
| 777 | tunnel->recursion--; |
| 778 | return 0; |
| 779 | } |
| 780 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 781 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 782 | { |
| 783 | struct net_device *tdev = NULL; |
| 784 | struct ip_tunnel *tunnel; |
| 785 | struct iphdr *iph; |
| 786 | int hlen = LL_MAX_HEADER; |
| 787 | int mtu = ETH_DATA_LEN; |
| 788 | int addend = sizeof(struct iphdr) + 4; |
| 789 | |
| 790 | tunnel = netdev_priv(dev); |
| 791 | iph = &tunnel->parms.iph; |
| 792 | |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 793 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 794 | |
| 795 | if (iph->daddr) { |
| 796 | struct flowi fl = { .oif = tunnel->parms.link, |
| 797 | .nl_u = { .ip4_u = |
| 798 | { .daddr = iph->daddr, |
| 799 | .saddr = iph->saddr, |
| 800 | .tos = RT_TOS(iph->tos) } }, |
| 801 | .proto = IPPROTO_GRE }; |
| 802 | struct rtable *rt; |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 803 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 804 | tdev = rt->u.dst.dev; |
| 805 | ip_rt_put(rt); |
| 806 | } |
| 807 | dev->flags |= IFF_POINTOPOINT; |
| 808 | } |
| 809 | |
| 810 | if (!tdev && tunnel->parms.link) |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 811 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 812 | |
| 813 | if (tdev) { |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 814 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 815 | mtu = tdev->mtu; |
| 816 | } |
| 817 | dev->iflink = tunnel->parms.link; |
| 818 | |
| 819 | /* Precalculate GRE options length */ |
| 820 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { |
| 821 | if (tunnel->parms.o_flags&GRE_CSUM) |
| 822 | addend += 4; |
| 823 | if (tunnel->parms.o_flags&GRE_KEY) |
| 824 | addend += 4; |
| 825 | if (tunnel->parms.o_flags&GRE_SEQ) |
| 826 | addend += 4; |
| 827 | } |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 828 | dev->needed_headroom = addend + hlen; |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 829 | mtu -= dev->hard_header_len - addend; |
| 830 | |
| 831 | if (mtu < 68) |
| 832 | mtu = 68; |
| 833 | |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 834 | tunnel->hlen = addend; |
| 835 | |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 836 | return mtu; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 837 | } |
| 838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | static int |
| 840 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) |
| 841 | { |
| 842 | int err = 0; |
| 843 | struct ip_tunnel_parm p; |
| 844 | struct ip_tunnel *t; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 845 | struct net *net = dev_net(dev); |
| 846 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
| 848 | switch (cmd) { |
| 849 | case SIOCGETTUNNEL: |
| 850 | t = NULL; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 851 | if (dev == ign->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| 853 | err = -EFAULT; |
| 854 | break; |
| 855 | } |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 856 | t = ipgre_tunnel_locate(net, &p, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | } |
| 858 | if (t == NULL) |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 859 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | memcpy(&p, &t->parms, sizeof(p)); |
| 861 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 862 | err = -EFAULT; |
| 863 | break; |
| 864 | |
| 865 | case SIOCADDTUNNEL: |
| 866 | case SIOCCHGTUNNEL: |
| 867 | err = -EPERM; |
| 868 | if (!capable(CAP_NET_ADMIN)) |
| 869 | goto done; |
| 870 | |
| 871 | err = -EFAULT; |
| 872 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 873 | goto done; |
| 874 | |
| 875 | err = -EINVAL; |
| 876 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || |
| 877 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || |
| 878 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) |
| 879 | goto done; |
| 880 | if (p.iph.ttl) |
| 881 | p.iph.frag_off |= htons(IP_DF); |
| 882 | |
| 883 | if (!(p.i_flags&GRE_KEY)) |
| 884 | p.i_key = 0; |
| 885 | if (!(p.o_flags&GRE_KEY)) |
| 886 | p.o_key = 0; |
| 887 | |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 888 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 890 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | if (t != NULL) { |
| 892 | if (t->dev != dev) { |
| 893 | err = -EEXIST; |
| 894 | break; |
| 895 | } |
| 896 | } else { |
| 897 | unsigned nflags=0; |
| 898 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 899 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 901 | if (ipv4_is_multicast(p.iph.daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | nflags = IFF_BROADCAST; |
| 903 | else if (p.iph.daddr) |
| 904 | nflags = IFF_POINTOPOINT; |
| 905 | |
| 906 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { |
| 907 | err = -EINVAL; |
| 908 | break; |
| 909 | } |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 910 | ipgre_tunnel_unlink(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | t->parms.iph.saddr = p.iph.saddr; |
| 912 | t->parms.iph.daddr = p.iph.daddr; |
| 913 | t->parms.i_key = p.i_key; |
| 914 | t->parms.o_key = p.o_key; |
| 915 | memcpy(dev->dev_addr, &p.iph.saddr, 4); |
| 916 | memcpy(dev->broadcast, &p.iph.daddr, 4); |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 917 | ipgre_tunnel_link(ign, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | netdev_state_change(dev); |
| 919 | } |
| 920 | } |
| 921 | |
| 922 | if (t) { |
| 923 | err = 0; |
| 924 | if (cmd == SIOCCHGTUNNEL) { |
| 925 | t->parms.iph.ttl = p.iph.ttl; |
| 926 | t->parms.iph.tos = p.iph.tos; |
| 927 | t->parms.iph.frag_off = p.iph.frag_off; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 928 | if (t->parms.link != p.link) { |
| 929 | t->parms.link = p.link; |
Herbert Xu | 42aa916 | 2008-10-09 11:59:32 -0700 | [diff] [blame] | 930 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 931 | netdev_state_change(dev); |
| 932 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | } |
| 934 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
| 935 | err = -EFAULT; |
| 936 | } else |
| 937 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
| 938 | break; |
| 939 | |
| 940 | case SIOCDELTUNNEL: |
| 941 | err = -EPERM; |
| 942 | if (!capable(CAP_NET_ADMIN)) |
| 943 | goto done; |
| 944 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 945 | if (dev == ign->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | err = -EFAULT; |
| 947 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 948 | goto done; |
| 949 | err = -ENOENT; |
Pavel Emelyanov | f57e7d5 | 2008-04-16 01:09:22 -0700 | [diff] [blame] | 950 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | goto done; |
| 952 | err = -EPERM; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 953 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | goto done; |
| 955 | dev = t->dev; |
| 956 | } |
Stephen Hemminger | 22f8cde | 2007-02-07 00:09:58 -0800 | [diff] [blame] | 957 | unregister_netdevice(dev); |
| 958 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | break; |
| 960 | |
| 961 | default: |
| 962 | err = -EINVAL; |
| 963 | } |
| 964 | |
| 965 | done: |
| 966 | return err; |
| 967 | } |
| 968 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
| 970 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 971 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 972 | if (new_mtu < 68 || |
| 973 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | return -EINVAL; |
| 975 | dev->mtu = new_mtu; |
| 976 | return 0; |
| 977 | } |
| 978 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | /* Nice toy. Unfortunately, useless in real life :-) |
| 980 | It allows to construct virtual multiprotocol broadcast "LAN" |
| 981 | over the Internet, provided multicast routing is tuned. |
| 982 | |
| 983 | |
| 984 | I have no idea was this bicycle invented before me, |
| 985 | so that I had to set ARPHRD_IPGRE to a random value. |
| 986 | I have an impression, that Cisco could make something similar, |
| 987 | but this feature is apparently missing in IOS<=11.2(8). |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
| 990 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) |
| 991 | |
| 992 | ping -t 255 224.66.66.66 |
| 993 | |
| 994 | If nobody answers, mbone does not work. |
| 995 | |
| 996 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 |
| 997 | ip addr add 10.66.66.<somewhat>/24 dev Universe |
| 998 | ifconfig Universe up |
| 999 | ifconfig Universe add fe80::<Your_real_addr>/10 |
| 1000 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 |
| 1001 | ftp 10.66.66.66 |
| 1002 | ... |
| 1003 | ftp fec0:6666:6666::193.233.7.65 |
| 1004 | ... |
| 1005 | |
| 1006 | */ |
| 1007 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1008 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
| 1009 | unsigned short type, |
| 1010 | const void *daddr, const void *saddr, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1012 | struct ip_tunnel *t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 1014 | __be16 *p = (__be16*)(iph+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | |
| 1016 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
| 1017 | p[0] = t->parms.o_flags; |
| 1018 | p[1] = htons(type); |
| 1019 | |
| 1020 | /* |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1021 | * Set the source hardware address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1023 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | if (saddr) |
| 1025 | memcpy(&iph->saddr, saddr, 4); |
| 1026 | |
| 1027 | if (daddr) { |
| 1028 | memcpy(&iph->daddr, daddr, 4); |
| 1029 | return t->hlen; |
| 1030 | } |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1031 | if (iph->daddr && !ipv4_is_multicast(iph->daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | return t->hlen; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1033 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | return -t->hlen; |
| 1035 | } |
| 1036 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1037 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
| 1038 | { |
| 1039 | struct iphdr *iph = (struct iphdr*) skb_mac_header(skb); |
| 1040 | memcpy(haddr, &iph->saddr, 4); |
| 1041 | return 4; |
| 1042 | } |
| 1043 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1044 | static const struct header_ops ipgre_header_ops = { |
| 1045 | .create = ipgre_header, |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1046 | .parse = ipgre_header_parse, |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1047 | }; |
| 1048 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1049 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | static int ipgre_open(struct net_device *dev) |
| 1051 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1052 | struct ip_tunnel *t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1054 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | struct flowi fl = { .oif = t->parms.link, |
| 1056 | .nl_u = { .ip4_u = |
| 1057 | { .daddr = t->parms.iph.daddr, |
| 1058 | .saddr = t->parms.iph.saddr, |
| 1059 | .tos = RT_TOS(t->parms.iph.tos) } }, |
| 1060 | .proto = IPPROTO_GRE }; |
| 1061 | struct rtable *rt; |
Pavel Emelyanov | 9663552 | 2008-04-16 01:10:44 -0700 | [diff] [blame] | 1062 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | return -EADDRNOTAVAIL; |
| 1064 | dev = rt->u.dst.dev; |
| 1065 | ip_rt_put(rt); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1066 | if (__in_dev_get_rtnl(dev) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | return -EADDRNOTAVAIL; |
| 1068 | t->mlink = dev->ifindex; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1069 | 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] | 1070 | } |
| 1071 | return 0; |
| 1072 | } |
| 1073 | |
| 1074 | static int ipgre_close(struct net_device *dev) |
| 1075 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1076 | struct ip_tunnel *t = netdev_priv(dev); |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1077 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
Denis V. Lunev | 7fee0ca | 2008-01-21 17:32:38 -0800 | [diff] [blame] | 1078 | struct in_device *in_dev; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1079 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | if (in_dev) { |
| 1081 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
| 1082 | in_dev_put(in_dev); |
| 1083 | } |
| 1084 | } |
| 1085 | return 0; |
| 1086 | } |
| 1087 | |
| 1088 | #endif |
| 1089 | |
| 1090 | static void ipgre_tunnel_setup(struct net_device *dev) |
| 1091 | { |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 1092 | dev->init = ipgre_tunnel_init; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | dev->uninit = ipgre_tunnel_uninit; |
| 1094 | dev->destructor = free_netdev; |
| 1095 | dev->hard_start_xmit = ipgre_tunnel_xmit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | dev->do_ioctl = ipgre_tunnel_ioctl; |
| 1097 | dev->change_mtu = ipgre_tunnel_change_mtu; |
| 1098 | |
| 1099 | dev->type = ARPHRD_IPGRE; |
Herbert Xu | c95b819 | 2008-10-09 11:58:54 -0700 | [diff] [blame] | 1100 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 1101 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | dev->flags = IFF_NOARP; |
| 1103 | dev->iflink = 0; |
| 1104 | dev->addr_len = 4; |
Pavel Emelyanov | 0b67ece | 2008-04-16 01:11:13 -0700 | [diff] [blame] | 1105 | dev->features |= NETIF_F_NETNS_LOCAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | } |
| 1107 | |
| 1108 | static int ipgre_tunnel_init(struct net_device *dev) |
| 1109 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | struct ip_tunnel *tunnel; |
| 1111 | struct iphdr *iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1113 | tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | iph = &tunnel->parms.iph; |
| 1115 | |
| 1116 | tunnel->dev = dev; |
| 1117 | strcpy(tunnel->parms.name, dev->name); |
| 1118 | |
| 1119 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); |
| 1120 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); |
| 1121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | if (iph->daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1124 | if (ipv4_is_multicast(iph->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | if (!iph->saddr) |
| 1126 | return -EINVAL; |
| 1127 | dev->flags = IFF_BROADCAST; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1128 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | dev->open = ipgre_open; |
| 1130 | dev->stop = ipgre_close; |
| 1131 | } |
| 1132 | #endif |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 1133 | } else |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 1134 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | return 0; |
| 1137 | } |
| 1138 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1139 | static int ipgre_fb_tunnel_init(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1141 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | struct iphdr *iph = &tunnel->parms.iph; |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1143 | struct ipgre_net *ign = net_generic(dev_net(dev), ipgre_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
| 1145 | tunnel->dev = dev; |
| 1146 | strcpy(tunnel->parms.name, dev->name); |
| 1147 | |
| 1148 | iph->version = 4; |
| 1149 | iph->protocol = IPPROTO_GRE; |
| 1150 | iph->ihl = 5; |
| 1151 | tunnel->hlen = sizeof(struct iphdr) + 4; |
| 1152 | |
| 1153 | dev_hold(dev); |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1154 | ign->tunnels_wc[0] = tunnel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | return 0; |
| 1156 | } |
| 1157 | |
| 1158 | |
| 1159 | static struct net_protocol ipgre_protocol = { |
| 1160 | .handler = ipgre_rcv, |
| 1161 | .err_handler = ipgre_err, |
Pavel Emelyanov | f96c148 | 2008-04-16 01:11:36 -0700 | [diff] [blame] | 1162 | .netns_ok = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | }; |
| 1164 | |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1165 | static void ipgre_destroy_tunnels(struct ipgre_net *ign) |
| 1166 | { |
| 1167 | int prio; |
| 1168 | |
| 1169 | for (prio = 0; prio < 4; prio++) { |
| 1170 | int h; |
| 1171 | for (h = 0; h < HASH_SIZE; h++) { |
| 1172 | struct ip_tunnel *t; |
| 1173 | while ((t = ign->tunnels[prio][h]) != NULL) |
| 1174 | unregister_netdevice(t->dev); |
| 1175 | } |
| 1176 | } |
| 1177 | } |
| 1178 | |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1179 | static int ipgre_init_net(struct net *net) |
| 1180 | { |
| 1181 | int err; |
| 1182 | struct ipgre_net *ign; |
| 1183 | |
| 1184 | err = -ENOMEM; |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1185 | ign = kzalloc(sizeof(struct ipgre_net), GFP_KERNEL); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1186 | if (ign == NULL) |
| 1187 | goto err_alloc; |
| 1188 | |
| 1189 | err = net_assign_generic(net, ipgre_net_id, ign); |
| 1190 | if (err < 0) |
| 1191 | goto err_assign; |
| 1192 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1193 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
| 1194 | ipgre_tunnel_setup); |
| 1195 | if (!ign->fb_tunnel_dev) { |
| 1196 | err = -ENOMEM; |
| 1197 | goto err_alloc_dev; |
| 1198 | } |
| 1199 | |
| 1200 | ign->fb_tunnel_dev->init = ipgre_fb_tunnel_init; |
| 1201 | dev_net_set(ign->fb_tunnel_dev, net); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 1202 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1203 | |
| 1204 | if ((err = register_netdev(ign->fb_tunnel_dev))) |
| 1205 | goto err_reg_dev; |
| 1206 | |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1207 | return 0; |
| 1208 | |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1209 | err_reg_dev: |
| 1210 | free_netdev(ign->fb_tunnel_dev); |
| 1211 | err_alloc_dev: |
| 1212 | /* nothing */ |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1213 | err_assign: |
| 1214 | kfree(ign); |
| 1215 | err_alloc: |
| 1216 | return err; |
| 1217 | } |
| 1218 | |
| 1219 | static void ipgre_exit_net(struct net *net) |
| 1220 | { |
| 1221 | struct ipgre_net *ign; |
| 1222 | |
| 1223 | ign = net_generic(net, ipgre_net_id); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1224 | rtnl_lock(); |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 1225 | ipgre_destroy_tunnels(ign); |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1226 | rtnl_unlock(); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1227 | kfree(ign); |
| 1228 | } |
| 1229 | |
| 1230 | static struct pernet_operations ipgre_net_ops = { |
| 1231 | .init = ipgre_init_net, |
| 1232 | .exit = ipgre_exit_net, |
| 1233 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 1235 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 1236 | { |
| 1237 | __be16 flags; |
| 1238 | |
| 1239 | if (!data) |
| 1240 | return 0; |
| 1241 | |
| 1242 | flags = 0; |
| 1243 | if (data[IFLA_GRE_IFLAGS]) |
| 1244 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 1245 | if (data[IFLA_GRE_OFLAGS]) |
| 1246 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 1247 | if (flags & (GRE_VERSION|GRE_ROUTING)) |
| 1248 | return -EINVAL; |
| 1249 | |
| 1250 | return 0; |
| 1251 | } |
| 1252 | |
| 1253 | static void ipgre_netlink_parms(struct nlattr *data[], |
| 1254 | struct ip_tunnel_parm *parms) |
| 1255 | { |
| 1256 | memset(parms, 0, sizeof(parms)); |
| 1257 | |
| 1258 | parms->iph.protocol = IPPROTO_GRE; |
| 1259 | |
| 1260 | if (!data) |
| 1261 | return; |
| 1262 | |
| 1263 | if (data[IFLA_GRE_LINK]) |
| 1264 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); |
| 1265 | |
| 1266 | if (data[IFLA_GRE_IFLAGS]) |
| 1267 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 1268 | |
| 1269 | if (data[IFLA_GRE_OFLAGS]) |
| 1270 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 1271 | |
| 1272 | if (data[IFLA_GRE_IKEY]) |
| 1273 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); |
| 1274 | |
| 1275 | if (data[IFLA_GRE_OKEY]) |
| 1276 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); |
| 1277 | |
| 1278 | if (data[IFLA_GRE_LOCAL]) |
| 1279 | memcpy(&parms->iph.saddr, nla_data(data[IFLA_GRE_LOCAL]), 4); |
| 1280 | |
| 1281 | if (data[IFLA_GRE_REMOTE]) |
| 1282 | memcpy(&parms->iph.daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); |
| 1283 | |
| 1284 | if (data[IFLA_GRE_TTL]) |
| 1285 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); |
| 1286 | |
| 1287 | if (data[IFLA_GRE_TOS]) |
| 1288 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); |
| 1289 | |
| 1290 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) |
| 1291 | parms->iph.frag_off = htons(IP_DF); |
| 1292 | } |
| 1293 | |
| 1294 | static int ipgre_newlink(struct net_device *dev, struct nlattr *tb[], |
| 1295 | struct nlattr *data[]) |
| 1296 | { |
| 1297 | struct ip_tunnel *nt; |
| 1298 | struct net *net = dev_net(dev); |
| 1299 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 1300 | int mtu; |
| 1301 | int err; |
| 1302 | |
| 1303 | nt = netdev_priv(dev); |
| 1304 | ipgre_netlink_parms(data, &nt->parms); |
| 1305 | |
| 1306 | if (ipgre_tunnel_locate(net, &nt->parms, 0)) |
| 1307 | return -EEXIST; |
| 1308 | |
| 1309 | mtu = ipgre_tunnel_bind_dev(dev); |
| 1310 | if (!tb[IFLA_MTU]) |
| 1311 | dev->mtu = mtu; |
| 1312 | |
| 1313 | err = register_netdevice(dev); |
| 1314 | if (err) |
| 1315 | goto out; |
| 1316 | |
| 1317 | dev_hold(dev); |
| 1318 | ipgre_tunnel_link(ign, nt); |
| 1319 | |
| 1320 | out: |
| 1321 | return err; |
| 1322 | } |
| 1323 | |
| 1324 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
| 1325 | struct nlattr *data[]) |
| 1326 | { |
| 1327 | struct ip_tunnel *t, *nt; |
| 1328 | struct net *net = dev_net(dev); |
| 1329 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
| 1330 | struct ip_tunnel_parm p; |
| 1331 | int mtu; |
| 1332 | |
| 1333 | if (dev == ign->fb_tunnel_dev) |
| 1334 | return -EINVAL; |
| 1335 | |
| 1336 | nt = netdev_priv(dev); |
| 1337 | ipgre_netlink_parms(data, &p); |
| 1338 | |
| 1339 | t = ipgre_tunnel_locate(net, &p, 0); |
| 1340 | |
| 1341 | if (t) { |
| 1342 | if (t->dev != dev) |
| 1343 | return -EEXIST; |
| 1344 | } else { |
| 1345 | unsigned nflags = 0; |
| 1346 | |
| 1347 | t = nt; |
| 1348 | |
| 1349 | if (ipv4_is_multicast(p.iph.daddr)) |
| 1350 | nflags = IFF_BROADCAST; |
| 1351 | else if (p.iph.daddr) |
| 1352 | nflags = IFF_POINTOPOINT; |
| 1353 | |
| 1354 | if ((dev->flags ^ nflags) & |
| 1355 | (IFF_POINTOPOINT | IFF_BROADCAST)) |
| 1356 | return -EINVAL; |
| 1357 | |
| 1358 | ipgre_tunnel_unlink(ign, t); |
| 1359 | t->parms.iph.saddr = p.iph.saddr; |
| 1360 | t->parms.iph.daddr = p.iph.daddr; |
| 1361 | t->parms.i_key = p.i_key; |
| 1362 | memcpy(dev->dev_addr, &p.iph.saddr, 4); |
| 1363 | memcpy(dev->broadcast, &p.iph.daddr, 4); |
| 1364 | ipgre_tunnel_link(ign, t); |
| 1365 | netdev_state_change(dev); |
| 1366 | } |
| 1367 | |
| 1368 | t->parms.o_key = p.o_key; |
| 1369 | t->parms.iph.ttl = p.iph.ttl; |
| 1370 | t->parms.iph.tos = p.iph.tos; |
| 1371 | t->parms.iph.frag_off = p.iph.frag_off; |
| 1372 | |
| 1373 | if (t->parms.link != p.link) { |
| 1374 | t->parms.link = p.link; |
| 1375 | mtu = ipgre_tunnel_bind_dev(dev); |
| 1376 | if (!tb[IFLA_MTU]) |
| 1377 | dev->mtu = mtu; |
| 1378 | netdev_state_change(dev); |
| 1379 | } |
| 1380 | |
| 1381 | return 0; |
| 1382 | } |
| 1383 | |
| 1384 | static size_t ipgre_get_size(const struct net_device *dev) |
| 1385 | { |
| 1386 | return |
| 1387 | /* IFLA_GRE_LINK */ |
| 1388 | nla_total_size(4) + |
| 1389 | /* IFLA_GRE_IFLAGS */ |
| 1390 | nla_total_size(2) + |
| 1391 | /* IFLA_GRE_OFLAGS */ |
| 1392 | nla_total_size(2) + |
| 1393 | /* IFLA_GRE_IKEY */ |
| 1394 | nla_total_size(4) + |
| 1395 | /* IFLA_GRE_OKEY */ |
| 1396 | nla_total_size(4) + |
| 1397 | /* IFLA_GRE_LOCAL */ |
| 1398 | nla_total_size(4) + |
| 1399 | /* IFLA_GRE_REMOTE */ |
| 1400 | nla_total_size(4) + |
| 1401 | /* IFLA_GRE_TTL */ |
| 1402 | nla_total_size(1) + |
| 1403 | /* IFLA_GRE_TOS */ |
| 1404 | nla_total_size(1) + |
| 1405 | /* IFLA_GRE_PMTUDISC */ |
| 1406 | nla_total_size(1) + |
| 1407 | 0; |
| 1408 | } |
| 1409 | |
| 1410 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 1411 | { |
| 1412 | struct ip_tunnel *t = netdev_priv(dev); |
| 1413 | struct ip_tunnel_parm *p = &t->parms; |
| 1414 | |
| 1415 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); |
| 1416 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); |
| 1417 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); |
| 1418 | NLA_PUT_BE32(skb, IFLA_GRE_IFLAGS, p->i_flags); |
| 1419 | NLA_PUT_BE32(skb, IFLA_GRE_OFLAGS, p->o_flags); |
| 1420 | NLA_PUT(skb, IFLA_GRE_LOCAL, 4, &p->iph.saddr); |
| 1421 | NLA_PUT(skb, IFLA_GRE_REMOTE, 4, &p->iph.daddr); |
| 1422 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); |
| 1423 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); |
| 1424 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); |
| 1425 | |
| 1426 | return 0; |
| 1427 | |
| 1428 | nla_put_failure: |
| 1429 | return -EMSGSIZE; |
| 1430 | } |
| 1431 | |
| 1432 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
| 1433 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, |
| 1434 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
| 1435 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
| 1436 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
| 1437 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
| 1438 | [IFLA_GRE_LOCAL] = { .len = 4 }, |
| 1439 | [IFLA_GRE_REMOTE] = { .len = 4 }, |
| 1440 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
| 1441 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, |
| 1442 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, |
| 1443 | }; |
| 1444 | |
| 1445 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { |
| 1446 | .kind = "gre", |
| 1447 | .maxtype = IFLA_GRE_MAX, |
| 1448 | .policy = ipgre_policy, |
| 1449 | .priv_size = sizeof(struct ip_tunnel), |
| 1450 | .setup = ipgre_tunnel_setup, |
| 1451 | .validate = ipgre_tunnel_validate, |
| 1452 | .newlink = ipgre_newlink, |
| 1453 | .changelink = ipgre_changelink, |
| 1454 | .get_size = ipgre_get_size, |
| 1455 | .fill_info = ipgre_fill_info, |
| 1456 | }; |
| 1457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | /* |
| 1459 | * And now the modules code and kernel interface. |
| 1460 | */ |
| 1461 | |
| 1462 | static int __init ipgre_init(void) |
| 1463 | { |
| 1464 | int err; |
| 1465 | |
| 1466 | printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); |
| 1467 | |
| 1468 | if (inet_add_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) { |
| 1469 | printk(KERN_INFO "ipgre init: can't add protocol\n"); |
| 1470 | return -EAGAIN; |
| 1471 | } |
| 1472 | |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1473 | err = register_pernet_gen_device(&ipgre_net_id, &ipgre_net_ops); |
| 1474 | if (err < 0) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 1475 | goto gen_device_failed; |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1476 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 1477 | err = rtnl_link_register(&ipgre_link_ops); |
| 1478 | if (err < 0) |
| 1479 | goto rtnl_link_failed; |
| 1480 | |
| 1481 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | return err; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 1483 | |
| 1484 | rtnl_link_failed: |
| 1485 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); |
| 1486 | gen_device_failed: |
| 1487 | inet_del_protocol(&ipgre_protocol, IPPROTO_GRE); |
| 1488 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | } |
| 1490 | |
Alexey Kuznetsov | db44575 | 2005-07-30 17:46:44 -0700 | [diff] [blame] | 1491 | static void __exit ipgre_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | { |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 1493 | rtnl_link_unregister(&ipgre_link_ops); |
| 1494 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | if (inet_del_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) |
| 1496 | printk(KERN_INFO "ipgre close: can't remove protocol\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | } |
| 1498 | |
| 1499 | module_init(ipgre_init); |
| 1500 | module_exit(ipgre_fini); |
| 1501 | MODULE_LICENSE("GPL"); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame^] | 1502 | MODULE_ALIAS("rtnl-link-gre"); |