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: IP/IP protocol decoder. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Authors: |
| 5 | * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 |
| 6 | * |
| 7 | * Fixes: |
| 8 | * Alan Cox : Merged and made usable non modular (its so tiny its silly as |
| 9 | * a module taking up 2 pages). |
| 10 | * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph) |
| 11 | * to keep ip_forward happy. |
| 12 | * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8). |
| 13 | * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL |
| 14 | * David Woodhouse : Perform some basic ICMP handling. |
| 15 | * IPIP Routing without decapsulation. |
| 16 | * Carlos Picoto : GRE over IP support |
| 17 | * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c. |
| 18 | * I do not want to merge them together. |
| 19 | * |
| 20 | * This program is free software; you can redistribute it and/or |
| 21 | * modify it under the terms of the GNU General Public License |
| 22 | * as published by the Free Software Foundation; either version |
| 23 | * 2 of the License, or (at your option) any later version. |
| 24 | * |
| 25 | */ |
| 26 | |
| 27 | /* tunnel.c: an IP tunnel driver |
| 28 | |
| 29 | The purpose of this driver is to provide an IP tunnel through |
| 30 | which you can tunnel network traffic transparently across subnets. |
| 31 | |
| 32 | This was written by looking at Nick Holloway's dummy driver |
| 33 | Thanks for the great code! |
| 34 | |
| 35 | -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | Minor tweaks: |
| 38 | Cleaned up the code a little and added some pre-1.3.0 tweaks. |
| 39 | dev->hard_header/hard_header_len changed to use no headers. |
| 40 | Comments/bracketing tweaked. |
| 41 | Made the tunnels use dev->name not tunnel: when error reporting. |
| 42 | Added tx_dropped stat |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 43 | |
Alan Cox | 113aa83 | 2008-10-13 19:01:08 -0700 | [diff] [blame] | 44 | -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | Reworked: |
| 47 | Changed to tunnel to destination gateway in addition to the |
| 48 | tunnel's pointopoint address |
| 49 | Almost completely rewritten |
| 50 | Note: There is currently no firewall or ICMP handling done. |
| 51 | |
| 52 | -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96 |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | */ |
| 55 | |
| 56 | /* Things I wish I had known when writing the tunnel driver: |
| 57 | |
| 58 | When the tunnel_xmit() function is called, the skb contains the |
| 59 | packet to be sent (plus a great deal of extra info), and dev |
| 60 | contains the tunnel device that _we_ are. |
| 61 | |
| 62 | When we are passed a packet, we are expected to fill in the |
| 63 | source address with our source IP address. |
| 64 | |
| 65 | What is the proper way to allocate, copy and free a buffer? |
| 66 | After you allocate it, it is a "0 length" chunk of memory |
| 67 | starting at zero. If you want to add headers to the buffer |
| 68 | later, you'll have to call "skb_reserve(skb, amount)" with |
| 69 | the amount of memory you want reserved. Then, you call |
| 70 | "skb_put(skb, amount)" with the amount of space you want in |
| 71 | the buffer. skb_put() returns a pointer to the top (#0) of |
| 72 | that buffer. skb->len is set to the amount of space you have |
| 73 | "allocated" with skb_put(). You can then write up to skb->len |
| 74 | bytes to that buffer. If you need more, you can call skb_put() |
| 75 | again with the additional amount of space you need. You can |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 76 | find out how much more space you can allocate by calling |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | "skb_tailroom(skb)". |
| 78 | Now, to add header space, call "skb_push(skb, header_len)". |
| 79 | This creates space at the beginning of the buffer and returns |
| 80 | a pointer to this new space. If later you need to strip a |
| 81 | header from a buffer, call "skb_pull(skb, header_len)". |
| 82 | skb_headroom() will return how much space is left at the top |
| 83 | of the buffer (before the main data). Remember, this headroom |
| 84 | space must be reserved before the skb_put() function is called. |
| 85 | */ |
| 86 | |
| 87 | /* |
| 88 | This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c |
| 89 | |
| 90 | For comments look at net/ipv4/ip_gre.c --ANK |
| 91 | */ |
| 92 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 93 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 94 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #include <linux/module.h> |
| 96 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | #include <linux/kernel.h> |
| 98 | #include <asm/uaccess.h> |
| 99 | #include <linux/skbuff.h> |
| 100 | #include <linux/netdevice.h> |
| 101 | #include <linux/in.h> |
| 102 | #include <linux/tcp.h> |
| 103 | #include <linux/udp.h> |
| 104 | #include <linux/if_arp.h> |
| 105 | #include <linux/mroute.h> |
| 106 | #include <linux/init.h> |
| 107 | #include <linux/netfilter_ipv4.h> |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 108 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | #include <net/sock.h> |
| 111 | #include <net/ip.h> |
| 112 | #include <net/icmp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | #include <net/ipip.h> |
| 114 | #include <net/inet_ecn.h> |
| 115 | #include <net/xfrm.h> |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 116 | #include <net/net_namespace.h> |
| 117 | #include <net/netns/generic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | #define HASH_SIZE 16 |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 120 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Eric Dumazet | f99189b | 2009-11-17 10:42:49 +0000 | [diff] [blame] | 122 | static int ipip_net_id __read_mostly; |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 123 | struct ipip_net { |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 124 | struct ip_tunnel *tunnels_r_l[HASH_SIZE]; |
| 125 | struct ip_tunnel *tunnels_r[HASH_SIZE]; |
| 126 | struct ip_tunnel *tunnels_l[HASH_SIZE]; |
| 127 | struct ip_tunnel *tunnels_wc[1]; |
| 128 | struct ip_tunnel **tunnels[4]; |
| 129 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 130 | struct net_device *fb_tunnel_dev; |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 131 | }; |
| 132 | |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 133 | static void ipip_fb_tunnel_init(struct net_device *dev); |
| 134 | static void ipip_tunnel_init(struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | static void ipip_tunnel_setup(struct net_device *dev); |
| 136 | |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 137 | /* |
| 138 | * Locking : hash tables are protected by RCU and a spinlock |
| 139 | */ |
| 140 | static DEFINE_SPINLOCK(ipip_lock); |
| 141 | |
| 142 | #define for_each_ip_tunnel_rcu(start) \ |
| 143 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 145 | static struct ip_tunnel * ipip_tunnel_lookup(struct net *net, |
| 146 | __be32 remote, __be32 local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
| 148 | unsigned h0 = HASH(remote); |
| 149 | unsigned h1 = HASH(local); |
| 150 | struct ip_tunnel *t; |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 151 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 153 | for_each_ip_tunnel_rcu(ipn->tunnels_r_l[h0 ^ h1]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | if (local == t->parms.iph.saddr && |
| 155 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
| 156 | return t; |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 157 | |
| 158 | for_each_ip_tunnel_rcu(ipn->tunnels_r[h0]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
| 160 | return t; |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 161 | |
| 162 | for_each_ip_tunnel_rcu(ipn->tunnels_l[h1]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
| 164 | return t; |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 165 | |
| 166 | t = rcu_dereference(ipn->tunnels_wc[0]); |
| 167 | if (t && (t->dev->flags&IFF_UP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return t; |
| 169 | return NULL; |
| 170 | } |
| 171 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 172 | static struct ip_tunnel **__ipip_bucket(struct ipip_net *ipn, |
| 173 | struct ip_tunnel_parm *parms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | { |
YOSHIFUJI Hideaki | 87d1a16 | 2007-04-24 20:44:47 +0900 | [diff] [blame] | 175 | __be32 remote = parms->iph.daddr; |
| 176 | __be32 local = parms->iph.saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | unsigned h = 0; |
| 178 | int prio = 0; |
| 179 | |
| 180 | if (remote) { |
| 181 | prio |= 2; |
| 182 | h ^= HASH(remote); |
| 183 | } |
| 184 | if (local) { |
| 185 | prio |= 1; |
| 186 | h ^= HASH(local); |
| 187 | } |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 188 | return &ipn->tunnels[prio][h]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 191 | static inline struct ip_tunnel **ipip_bucket(struct ipip_net *ipn, |
| 192 | struct ip_tunnel *t) |
YOSHIFUJI Hideaki | 87d1a16 | 2007-04-24 20:44:47 +0900 | [diff] [blame] | 193 | { |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 194 | return __ipip_bucket(ipn, &t->parms); |
YOSHIFUJI Hideaki | 87d1a16 | 2007-04-24 20:44:47 +0900 | [diff] [blame] | 195 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 197 | static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | { |
| 199 | struct ip_tunnel **tp; |
| 200 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 201 | for (tp = ipip_bucket(ipn, t); *tp; tp = &(*tp)->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | if (t == *tp) { |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 203 | spin_lock_bh(&ipip_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | *tp = t->next; |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 205 | spin_unlock_bh(&ipip_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | break; |
| 207 | } |
| 208 | } |
| 209 | } |
| 210 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 211 | static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | { |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 213 | struct ip_tunnel **tp = ipip_bucket(ipn, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 215 | spin_lock_bh(&ipip_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | t->next = *tp; |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 217 | rcu_assign_pointer(*tp, t); |
| 218 | spin_unlock_bh(&ipip_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | } |
| 220 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 221 | static struct ip_tunnel * ipip_tunnel_locate(struct net *net, |
| 222 | struct ip_tunnel_parm *parms, int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 224 | __be32 remote = parms->iph.daddr; |
| 225 | __be32 local = parms->iph.saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | struct ip_tunnel *t, **tp, *nt; |
| 227 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | char name[IFNAMSIZ]; |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 229 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 231 | for (tp = __ipip_bucket(ipn, parms); (t = *tp) != NULL; tp = &t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
| 233 | return t; |
| 234 | } |
| 235 | if (!create) |
| 236 | return NULL; |
| 237 | |
| 238 | if (parms->name[0]) |
| 239 | strlcpy(name, parms->name, IFNAMSIZ); |
Pavel Emelyanov | 34cc7ba | 2008-02-23 20:19:20 -0800 | [diff] [blame] | 240 | else |
| 241 | sprintf(name, "tunl%%d"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
| 243 | dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); |
| 244 | if (dev == NULL) |
| 245 | return NULL; |
| 246 | |
Pavel Emelyanov | 0a82640 | 2008-04-16 01:06:18 -0700 | [diff] [blame] | 247 | dev_net_set(dev, net); |
| 248 | |
Pavel Emelyanov | b37d428 | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 249 | if (strchr(name, '%')) { |
| 250 | if (dev_alloc_name(dev, name) < 0) |
| 251 | goto failed_free; |
| 252 | } |
| 253 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 254 | nt = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | nt->parms = *parms; |
| 256 | |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 257 | ipip_tunnel_init(dev); |
| 258 | |
Pavel Emelyanov | b37d428 | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 259 | if (register_netdevice(dev) < 0) |
| 260 | goto failed_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | dev_hold(dev); |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 263 | ipip_tunnel_link(ipn, nt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | return nt; |
| 265 | |
Pavel Emelyanov | b37d428 | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 266 | failed_free: |
| 267 | free_netdev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | return NULL; |
| 269 | } |
| 270 | |
| 271 | static void ipip_tunnel_uninit(struct net_device *dev) |
| 272 | { |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 273 | struct net *net = dev_net(dev); |
| 274 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
| 275 | |
| 276 | if (dev == ipn->fb_tunnel_dev) { |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 277 | spin_lock_bh(&ipip_lock); |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 278 | ipn->tunnels_wc[0] = NULL; |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 279 | spin_unlock_bh(&ipip_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | } else |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 281 | ipip_tunnel_unlink(ipn, netdev_priv(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | dev_put(dev); |
| 283 | } |
| 284 | |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 285 | static int ipip_err(struct sk_buff *skb, u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
Rami Rosen | 071f92d | 2008-05-21 17:47:54 -0700 | [diff] [blame] | 288 | /* All the routers (except for Linux) return only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | 8 bytes of packet payload. It means, that precise relaying of |
| 290 | ICMP in the real Internet is absolutely infeasible. |
| 291 | */ |
Jianjun Kong | 5a5f3a8 | 2008-11-03 00:24:34 -0800 | [diff] [blame] | 292 | struct iphdr *iph = (struct iphdr *)skb->data; |
Arnaldo Carvalho de Melo | 88c7664 | 2007-03-13 14:43:18 -0300 | [diff] [blame] | 293 | const int type = icmp_hdr(skb)->type; |
| 294 | const int code = icmp_hdr(skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | struct ip_tunnel *t; |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 296 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
| 298 | switch (type) { |
| 299 | default: |
| 300 | case ICMP_PARAMETERPROB: |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 301 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
| 303 | case ICMP_DEST_UNREACH: |
| 304 | switch (code) { |
| 305 | case ICMP_SR_FAILED: |
| 306 | case ICMP_PORT_UNREACH: |
| 307 | /* Impossible event. */ |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 308 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | case ICMP_FRAG_NEEDED: |
| 310 | /* Soft state for pmtu is maintained by IP core. */ |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 311 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | default: |
| 313 | /* All others are translated to HOST_UNREACH. |
| 314 | rfc2003 contains "deep thoughts" about NET_UNREACH, |
| 315 | I believe they are just ether pollution. --ANK |
| 316 | */ |
| 317 | break; |
| 318 | } |
| 319 | break; |
| 320 | case ICMP_TIME_EXCEEDED: |
| 321 | if (code != ICMP_EXC_TTL) |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 322 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | break; |
| 324 | } |
| 325 | |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 326 | err = -ENOENT; |
| 327 | |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 328 | rcu_read_lock(); |
Pavel Emelyanov | cec3ffa | 2008-04-16 01:05:03 -0700 | [diff] [blame] | 329 | t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | if (t == NULL || t->parms.iph.daddr == 0) |
| 331 | goto out; |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 332 | |
| 333 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
| 335 | goto out; |
| 336 | |
Wei Yongjun | 26d94b4 | 2009-02-24 23:36:47 -0800 | [diff] [blame] | 337 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | t->err_count++; |
| 339 | else |
| 340 | t->err_count = 1; |
| 341 | t->err_time = jiffies; |
| 342 | out: |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 343 | rcu_read_unlock(); |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 344 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 347 | static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph, |
| 348 | struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 350 | struct iphdr *inner_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
| 352 | if (INET_ECN_is_ce(outer_iph->tos)) |
| 353 | IP_ECN_set_ce(inner_iph); |
| 354 | } |
| 355 | |
| 356 | static int ipip_rcv(struct sk_buff *skb) |
| 357 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | struct ip_tunnel *tunnel; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 359 | const struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 361 | rcu_read_lock(); |
Pavel Emelyanov | cec3ffa | 2008-04-16 01:05:03 -0700 | [diff] [blame] | 362 | if ((tunnel = ipip_tunnel_lookup(dev_net(skb->dev), |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 363 | iph->saddr, iph->daddr)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 365 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | kfree_skb(skb); |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | secpath_reset(skb); |
| 371 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 372 | skb->mac_header = skb->network_header; |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 373 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | skb->protocol = htons(ETH_P_IP); |
| 375 | skb->pkt_type = PACKET_HOST; |
| 376 | |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 377 | tunnel->dev->stats.rx_packets++; |
| 378 | tunnel->dev->stats.rx_bytes += skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | skb->dev = tunnel->dev; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 380 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | nf_reset(skb); |
| 382 | ipip_ecn_decapsulate(iph, skb); |
| 383 | netif_rx(skb); |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 384 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | return 0; |
| 386 | } |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 387 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | return -1; |
| 390 | } |
| 391 | |
| 392 | /* |
| 393 | * This function assumes it is being called from dev_queue_xmit() |
| 394 | * and that skb is filled properly by that function. |
| 395 | */ |
| 396 | |
Stephen Hemminger | 6fef4c0 | 2009-08-31 19:50:41 +0000 | [diff] [blame] | 397 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 399 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Eric Dumazet | 0bfbedb | 2009-10-05 00:11:22 -0700 | [diff] [blame] | 400 | struct net_device_stats *stats = &dev->stats; |
| 401 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | struct iphdr *tiph = &tunnel->parms.iph; |
| 403 | u8 tos = tunnel->parms.iph.tos; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 404 | __be16 df = tiph->frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | struct rtable *rt; /* Route to the other host */ |
| 406 | struct net_device *tdev; /* Device to other host */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 407 | struct iphdr *old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | struct iphdr *iph; /* Our new IP header */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 409 | unsigned int max_headroom; /* The extra header space needed */ |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 410 | __be32 dst = tiph->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | int mtu; |
| 412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | if (skb->protocol != htons(ETH_P_IP)) |
| 414 | goto tx_error; |
| 415 | |
| 416 | if (tos&1) |
| 417 | tos = old_iph->tos; |
| 418 | |
| 419 | if (!dst) { |
| 420 | /* NBMA tunnel */ |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 421 | if ((rt = skb_rtable(skb)) == NULL) { |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 422 | stats->tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | goto tx_error; |
| 424 | } |
| 425 | if ((dst = rt->rt_gateway) == 0) |
| 426 | goto tx_error_icmp; |
| 427 | } |
| 428 | |
| 429 | { |
| 430 | struct flowi fl = { .oif = tunnel->parms.link, |
| 431 | .nl_u = { .ip4_u = |
| 432 | { .daddr = dst, |
| 433 | .saddr = tiph->saddr, |
| 434 | .tos = RT_TOS(tos) } }, |
| 435 | .proto = IPPROTO_IPIP }; |
Pavel Emelyanov | b99f015 | 2008-04-16 01:05:57 -0700 | [diff] [blame] | 436 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 437 | stats->tx_carrier_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | goto tx_error_icmp; |
| 439 | } |
| 440 | } |
| 441 | tdev = rt->u.dst.dev; |
| 442 | |
| 443 | if (tdev == dev) { |
| 444 | ip_rt_put(rt); |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 445 | stats->collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | goto tx_error; |
| 447 | } |
| 448 | |
Herbert Xu | 23ca0c9 | 2009-11-06 10:37:41 +0000 | [diff] [blame] | 449 | df |= old_iph->frag_off & htons(IP_DF); |
| 450 | |
| 451 | if (df) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
Herbert Xu | 23ca0c9 | 2009-11-06 10:37:41 +0000 | [diff] [blame] | 454 | if (mtu < 68) { |
| 455 | stats->collisions++; |
| 456 | ip_rt_put(rt); |
| 457 | goto tx_error; |
| 458 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Herbert Xu | 23ca0c9 | 2009-11-06 10:37:41 +0000 | [diff] [blame] | 460 | if (skb_dst(skb)) |
| 461 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
Herbert Xu | 23ca0c9 | 2009-11-06 10:37:41 +0000 | [diff] [blame] | 463 | if ((old_iph->frag_off & htons(IP_DF)) && |
| 464 | mtu < ntohs(old_iph->tot_len)) { |
| 465 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
| 466 | htonl(mtu)); |
| 467 | ip_rt_put(rt); |
| 468 | goto tx_error; |
| 469 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | } |
| 471 | |
| 472 | if (tunnel->err_count > 0) { |
Wei Yongjun | 26d94b4 | 2009-02-24 23:36:47 -0800 | [diff] [blame] | 473 | if (time_before(jiffies, |
| 474 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | tunnel->err_count--; |
| 476 | dst_link_failure(skb); |
| 477 | } else |
| 478 | tunnel->err_count = 0; |
| 479 | } |
| 480 | |
| 481 | /* |
| 482 | * Okay, now see if we can stuff it in the buffer as-is. |
| 483 | */ |
| 484 | max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); |
| 485 | |
Patrick McHardy | cfbba49 | 2007-07-09 15:33:40 -0700 | [diff] [blame] | 486 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
| 487 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
| 489 | if (!new_skb) { |
| 490 | ip_rt_put(rt); |
Eric Dumazet | 0bfbedb | 2009-10-05 00:11:22 -0700 | [diff] [blame] | 491 | txq->tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 493 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | if (skb->sk) |
| 496 | skb_set_owner_w(new_skb, skb->sk); |
| 497 | dev_kfree_skb(skb); |
| 498 | skb = new_skb; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 499 | old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | } |
| 501 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 502 | skb->transport_header = skb->network_header; |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 503 | skb_push(skb, sizeof(struct iphdr)); |
| 504 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
Patrick McHardy | 48d5cad | 2006-02-15 15:10:22 -0800 | [diff] [blame] | 506 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
| 507 | IPSKB_REROUTED); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 508 | skb_dst_drop(skb); |
| 509 | skb_dst_set(skb, &rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
| 511 | /* |
| 512 | * Push down and install the IPIP header. |
| 513 | */ |
| 514 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 515 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | iph->version = 4; |
| 517 | iph->ihl = sizeof(struct iphdr)>>2; |
| 518 | iph->frag_off = df; |
| 519 | iph->protocol = IPPROTO_IPIP; |
| 520 | iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); |
| 521 | iph->daddr = rt->rt_dst; |
| 522 | iph->saddr = rt->rt_src; |
| 523 | |
| 524 | if ((iph->ttl = tiph->ttl) == 0) |
| 525 | iph->ttl = old_iph->ttl; |
| 526 | |
| 527 | nf_reset(skb); |
| 528 | |
| 529 | IPTUNNEL_XMIT(); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 530 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
| 532 | tx_error_icmp: |
| 533 | dst_link_failure(skb); |
| 534 | tx_error: |
| 535 | stats->tx_errors++; |
| 536 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 537 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | } |
| 539 | |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 540 | static void ipip_tunnel_bind_dev(struct net_device *dev) |
| 541 | { |
| 542 | struct net_device *tdev = NULL; |
| 543 | struct ip_tunnel *tunnel; |
| 544 | struct iphdr *iph; |
| 545 | |
| 546 | tunnel = netdev_priv(dev); |
| 547 | iph = &tunnel->parms.iph; |
| 548 | |
| 549 | if (iph->daddr) { |
| 550 | struct flowi fl = { .oif = tunnel->parms.link, |
| 551 | .nl_u = { .ip4_u = |
| 552 | { .daddr = iph->daddr, |
| 553 | .saddr = iph->saddr, |
| 554 | .tos = RT_TOS(iph->tos) } }, |
| 555 | .proto = IPPROTO_IPIP }; |
| 556 | struct rtable *rt; |
Pavel Emelyanov | b99f015 | 2008-04-16 01:05:57 -0700 | [diff] [blame] | 557 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 558 | tdev = rt->u.dst.dev; |
| 559 | ip_rt_put(rt); |
| 560 | } |
| 561 | dev->flags |= IFF_POINTOPOINT; |
| 562 | } |
| 563 | |
| 564 | if (!tdev && tunnel->parms.link) |
Pavel Emelyanov | b99f015 | 2008-04-16 01:05:57 -0700 | [diff] [blame] | 565 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 566 | |
| 567 | if (tdev) { |
| 568 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); |
| 569 | dev->mtu = tdev->mtu - sizeof(struct iphdr); |
| 570 | } |
| 571 | dev->iflink = tunnel->parms.link; |
| 572 | } |
| 573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | static int |
| 575 | ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) |
| 576 | { |
| 577 | int err = 0; |
| 578 | struct ip_tunnel_parm p; |
| 579 | struct ip_tunnel *t; |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 580 | struct net *net = dev_net(dev); |
| 581 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
| 583 | switch (cmd) { |
| 584 | case SIOCGETTUNNEL: |
| 585 | t = NULL; |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 586 | if (dev == ipn->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| 588 | err = -EFAULT; |
| 589 | break; |
| 590 | } |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 591 | t = ipip_tunnel_locate(net, &p, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | } |
| 593 | if (t == NULL) |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 594 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | memcpy(&p, &t->parms, sizeof(p)); |
| 596 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 597 | err = -EFAULT; |
| 598 | break; |
| 599 | |
| 600 | case SIOCADDTUNNEL: |
| 601 | case SIOCCHGTUNNEL: |
| 602 | err = -EPERM; |
| 603 | if (!capable(CAP_NET_ADMIN)) |
| 604 | goto done; |
| 605 | |
| 606 | err = -EFAULT; |
| 607 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 608 | goto done; |
| 609 | |
| 610 | err = -EINVAL; |
| 611 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || |
| 612 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) |
| 613 | goto done; |
| 614 | if (p.iph.ttl) |
| 615 | p.iph.frag_off |= htons(IP_DF); |
| 616 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 617 | t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 619 | if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | if (t != NULL) { |
| 621 | if (t->dev != dev) { |
| 622 | err = -EEXIST; |
| 623 | break; |
| 624 | } |
| 625 | } else { |
| 626 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || |
| 627 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { |
| 628 | err = -EINVAL; |
| 629 | break; |
| 630 | } |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 631 | t = netdev_priv(dev); |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 632 | ipip_tunnel_unlink(ipn, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | t->parms.iph.saddr = p.iph.saddr; |
| 634 | t->parms.iph.daddr = p.iph.daddr; |
| 635 | memcpy(dev->dev_addr, &p.iph.saddr, 4); |
| 636 | memcpy(dev->broadcast, &p.iph.daddr, 4); |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 637 | ipip_tunnel_link(ipn, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | netdev_state_change(dev); |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | if (t) { |
| 643 | err = 0; |
| 644 | if (cmd == SIOCCHGTUNNEL) { |
| 645 | t->parms.iph.ttl = p.iph.ttl; |
| 646 | t->parms.iph.tos = p.iph.tos; |
| 647 | t->parms.iph.frag_off = p.iph.frag_off; |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 648 | if (t->parms.link != p.link) { |
| 649 | t->parms.link = p.link; |
| 650 | ipip_tunnel_bind_dev(dev); |
| 651 | netdev_state_change(dev); |
| 652 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
| 654 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
| 655 | err = -EFAULT; |
| 656 | } else |
| 657 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
| 658 | break; |
| 659 | |
| 660 | case SIOCDELTUNNEL: |
| 661 | err = -EPERM; |
| 662 | if (!capable(CAP_NET_ADMIN)) |
| 663 | goto done; |
| 664 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 665 | if (dev == ipn->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | err = -EFAULT; |
| 667 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 668 | goto done; |
| 669 | err = -ENOENT; |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 670 | if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | goto done; |
| 672 | err = -EPERM; |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 673 | if (t->dev == ipn->fb_tunnel_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | goto done; |
| 675 | dev = t->dev; |
| 676 | } |
Stephen Hemminger | 22f8cde | 2007-02-07 00:09:58 -0800 | [diff] [blame] | 677 | unregister_netdevice(dev); |
| 678 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | break; |
| 680 | |
| 681 | default: |
| 682 | err = -EINVAL; |
| 683 | } |
| 684 | |
| 685 | done: |
| 686 | return err; |
| 687 | } |
| 688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
| 690 | { |
| 691 | if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) |
| 692 | return -EINVAL; |
| 693 | dev->mtu = new_mtu; |
| 694 | return 0; |
| 695 | } |
| 696 | |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 697 | static const struct net_device_ops ipip_netdev_ops = { |
| 698 | .ndo_uninit = ipip_tunnel_uninit, |
| 699 | .ndo_start_xmit = ipip_tunnel_xmit, |
| 700 | .ndo_do_ioctl = ipip_tunnel_ioctl, |
| 701 | .ndo_change_mtu = ipip_tunnel_change_mtu, |
| 702 | |
| 703 | }; |
| 704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | static void ipip_tunnel_setup(struct net_device *dev) |
| 706 | { |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 707 | dev->netdev_ops = &ipip_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | dev->destructor = free_netdev; |
| 709 | |
| 710 | dev->type = ARPHRD_TUNNEL; |
| 711 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 712 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | dev->flags = IFF_NOARP; |
| 714 | dev->iflink = 0; |
| 715 | dev->addr_len = 4; |
Pavel Emelyanov | 0a82640 | 2008-04-16 01:06:18 -0700 | [diff] [blame] | 716 | dev->features |= NETIF_F_NETNS_LOCAL; |
Eric Dumazet | 28e7221 | 2009-05-28 10:44:30 +0000 | [diff] [blame] | 717 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | } |
| 719 | |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 720 | static void ipip_tunnel_init(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | { |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 722 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | tunnel->dev = dev; |
| 725 | strcpy(tunnel->parms.name, dev->name); |
| 726 | |
| 727 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); |
| 728 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); |
| 729 | |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 730 | ipip_tunnel_bind_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | } |
| 732 | |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 733 | static void ipip_fb_tunnel_init(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 735 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | struct iphdr *iph = &tunnel->parms.iph; |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 737 | struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
| 739 | tunnel->dev = dev; |
| 740 | strcpy(tunnel->parms.name, dev->name); |
| 741 | |
| 742 | iph->version = 4; |
| 743 | iph->protocol = IPPROTO_IPIP; |
| 744 | iph->ihl = 5; |
| 745 | |
| 746 | dev_hold(dev); |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 747 | ipn->tunnels_wc[0] = tunnel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | } |
| 749 | |
| 750 | static struct xfrm_tunnel ipip_handler = { |
| 751 | .handler = ipip_rcv, |
| 752 | .err_handler = ipip_err, |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 753 | .priority = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | }; |
| 755 | |
Stephen Hemminger | 5747a1a | 2009-02-22 00:02:08 -0800 | [diff] [blame] | 756 | static const char banner[] __initconst = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | KERN_INFO "IPv4 over IPv4 tunneling driver\n"; |
| 758 | |
Eric Dumazet | 0694c4c | 2009-10-27 07:06:59 +0000 | [diff] [blame] | 759 | static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head) |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 760 | { |
| 761 | int prio; |
| 762 | |
| 763 | for (prio = 1; prio < 4; prio++) { |
| 764 | int h; |
| 765 | for (h = 0; h < HASH_SIZE; h++) { |
Eric Dumazet | 0694c4c | 2009-10-27 07:06:59 +0000 | [diff] [blame] | 766 | struct ip_tunnel *t = ipn->tunnels[prio][h]; |
| 767 | |
| 768 | while (t != NULL) { |
| 769 | unregister_netdevice_queue(t->dev, head); |
| 770 | t = t->next; |
| 771 | } |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 772 | } |
| 773 | } |
| 774 | } |
| 775 | |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 776 | static int ipip_init_net(struct net *net) |
| 777 | { |
| 778 | int err; |
| 779 | struct ipip_net *ipn; |
| 780 | |
| 781 | err = -ENOMEM; |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 782 | ipn = kzalloc(sizeof(struct ipip_net), GFP_KERNEL); |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 783 | if (ipn == NULL) |
| 784 | goto err_alloc; |
| 785 | |
| 786 | err = net_assign_generic(net, ipip_net_id, ipn); |
| 787 | if (err < 0) |
| 788 | goto err_assign; |
| 789 | |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 790 | ipn->tunnels[0] = ipn->tunnels_wc; |
| 791 | ipn->tunnels[1] = ipn->tunnels_l; |
| 792 | ipn->tunnels[2] = ipn->tunnels_r; |
| 793 | ipn->tunnels[3] = ipn->tunnels_r_l; |
| 794 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 795 | ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), |
| 796 | "tunl0", |
| 797 | ipip_tunnel_setup); |
| 798 | if (!ipn->fb_tunnel_dev) { |
| 799 | err = -ENOMEM; |
| 800 | goto err_alloc_dev; |
| 801 | } |
Alexey Dobriyan | be77e59 | 2008-11-23 17:26:26 -0800 | [diff] [blame] | 802 | dev_net_set(ipn->fb_tunnel_dev, net); |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 803 | |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 804 | ipip_fb_tunnel_init(ipn->fb_tunnel_dev); |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 805 | |
| 806 | if ((err = register_netdev(ipn->fb_tunnel_dev))) |
| 807 | goto err_reg_dev; |
| 808 | |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 809 | return 0; |
| 810 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 811 | err_reg_dev: |
| 812 | free_netdev(ipn->fb_tunnel_dev); |
| 813 | err_alloc_dev: |
| 814 | /* nothing */ |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 815 | err_assign: |
| 816 | kfree(ipn); |
| 817 | err_alloc: |
| 818 | return err; |
| 819 | } |
| 820 | |
| 821 | static void ipip_exit_net(struct net *net) |
| 822 | { |
| 823 | struct ipip_net *ipn; |
Eric Dumazet | 0694c4c | 2009-10-27 07:06:59 +0000 | [diff] [blame] | 824 | LIST_HEAD(list); |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 825 | |
| 826 | ipn = net_generic(net, ipip_net_id); |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 827 | rtnl_lock(); |
Eric Dumazet | 0694c4c | 2009-10-27 07:06:59 +0000 | [diff] [blame] | 828 | ipip_destroy_tunnels(ipn, &list); |
| 829 | unregister_netdevice_queue(ipn->fb_tunnel_dev, &list); |
| 830 | unregister_netdevice_many(&list); |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 831 | rtnl_unlock(); |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 832 | kfree(ipn); |
| 833 | } |
| 834 | |
| 835 | static struct pernet_operations ipip_net_ops = { |
| 836 | .init = ipip_init_net, |
| 837 | .exit = ipip_exit_net, |
| 838 | }; |
| 839 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | static int __init ipip_init(void) |
| 841 | { |
| 842 | int err; |
| 843 | |
| 844 | printk(banner); |
| 845 | |
Kazunori MIYAZAWA | c0d5640 | 2007-02-13 12:54:47 -0800 | [diff] [blame] | 846 | if (xfrm4_tunnel_register(&ipip_handler, AF_INET)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | printk(KERN_INFO "ipip init: can't register tunnel\n"); |
| 848 | return -EAGAIN; |
| 849 | } |
| 850 | |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 851 | err = register_pernet_gen_device(&ipip_net_id, &ipip_net_ops); |
| 852 | if (err) |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 853 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
| 854 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | static void __exit ipip_fini(void) |
| 859 | { |
Kazunori MIYAZAWA | c0d5640 | 2007-02-13 12:54:47 -0800 | [diff] [blame] | 860 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | printk(KERN_INFO "ipip close: can't deregister tunnel\n"); |
| 862 | |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 863 | unregister_pernet_gen_device(ipip_net_id, &ipip_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } |
| 865 | |
| 866 | module_init(ipip_init); |
| 867 | module_exit(ipip_fini); |
| 868 | MODULE_LICENSE("GPL"); |