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 | |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 122 | static int ipip_net_id; |
| 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | static int ipip_fb_tunnel_init(struct net_device *dev); |
| 134 | static int ipip_tunnel_init(struct net_device *dev); |
| 135 | static void ipip_tunnel_setup(struct net_device *dev); |
| 136 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | static DEFINE_RWLOCK(ipip_lock); |
| 138 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 139 | static struct ip_tunnel * ipip_tunnel_lookup(struct net *net, |
| 140 | __be32 remote, __be32 local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | { |
| 142 | unsigned h0 = HASH(remote); |
| 143 | unsigned h1 = HASH(local); |
| 144 | struct ip_tunnel *t; |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 145 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 147 | for (t = ipn->tunnels_r_l[h0^h1]; t; t = t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | if (local == t->parms.iph.saddr && |
| 149 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
| 150 | return t; |
| 151 | } |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 152 | for (t = ipn->tunnels_r[h0]; t; t = t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
| 154 | return t; |
| 155 | } |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 156 | for (t = ipn->tunnels_l[h1]; t; t = t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
| 158 | return t; |
| 159 | } |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 160 | if ((t = ipn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | return t; |
| 162 | return NULL; |
| 163 | } |
| 164 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 165 | static struct ip_tunnel **__ipip_bucket(struct ipip_net *ipn, |
| 166 | struct ip_tunnel_parm *parms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
YOSHIFUJI Hideaki | 87d1a16 | 2007-04-24 20:44:47 +0900 | [diff] [blame] | 168 | __be32 remote = parms->iph.daddr; |
| 169 | __be32 local = parms->iph.saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | unsigned h = 0; |
| 171 | int prio = 0; |
| 172 | |
| 173 | if (remote) { |
| 174 | prio |= 2; |
| 175 | h ^= HASH(remote); |
| 176 | } |
| 177 | if (local) { |
| 178 | prio |= 1; |
| 179 | h ^= HASH(local); |
| 180 | } |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 181 | return &ipn->tunnels[prio][h]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 184 | static inline struct ip_tunnel **ipip_bucket(struct ipip_net *ipn, |
| 185 | struct ip_tunnel *t) |
YOSHIFUJI Hideaki | 87d1a16 | 2007-04-24 20:44:47 +0900 | [diff] [blame] | 186 | { |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 187 | return __ipip_bucket(ipn, &t->parms); |
YOSHIFUJI Hideaki | 87d1a16 | 2007-04-24 20:44:47 +0900 | [diff] [blame] | 188 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 190 | 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] | 191 | { |
| 192 | struct ip_tunnel **tp; |
| 193 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 194 | for (tp = ipip_bucket(ipn, t); *tp; tp = &(*tp)->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | if (t == *tp) { |
| 196 | write_lock_bh(&ipip_lock); |
| 197 | *tp = t->next; |
| 198 | write_unlock_bh(&ipip_lock); |
| 199 | break; |
| 200 | } |
| 201 | } |
| 202 | } |
| 203 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 204 | 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] | 205 | { |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 206 | struct ip_tunnel **tp = ipip_bucket(ipn, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
| 208 | t->next = *tp; |
| 209 | write_lock_bh(&ipip_lock); |
| 210 | *tp = t; |
| 211 | write_unlock_bh(&ipip_lock); |
| 212 | } |
| 213 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 214 | static struct ip_tunnel * ipip_tunnel_locate(struct net *net, |
| 215 | struct ip_tunnel_parm *parms, int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 217 | __be32 remote = parms->iph.daddr; |
| 218 | __be32 local = parms->iph.saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | struct ip_tunnel *t, **tp, *nt; |
| 220 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | char name[IFNAMSIZ]; |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 222 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 224 | for (tp = __ipip_bucket(ipn, parms); (t = *tp) != NULL; tp = &t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
| 226 | return t; |
| 227 | } |
| 228 | if (!create) |
| 229 | return NULL; |
| 230 | |
| 231 | if (parms->name[0]) |
| 232 | strlcpy(name, parms->name, IFNAMSIZ); |
Pavel Emelyanov | 34cc7ba | 2008-02-23 20:19:20 -0800 | [diff] [blame] | 233 | else |
| 234 | sprintf(name, "tunl%%d"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
| 236 | dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); |
| 237 | if (dev == NULL) |
| 238 | return NULL; |
| 239 | |
Pavel Emelyanov | 0a82640 | 2008-04-16 01:06:18 -0700 | [diff] [blame] | 240 | dev_net_set(dev, net); |
| 241 | |
Pavel Emelyanov | b37d428 | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 242 | if (strchr(name, '%')) { |
| 243 | if (dev_alloc_name(dev, name) < 0) |
| 244 | goto failed_free; |
| 245 | } |
| 246 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 247 | nt = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | dev->init = ipip_tunnel_init; |
| 249 | nt->parms = *parms; |
| 250 | |
Pavel Emelyanov | b37d428 | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 251 | if (register_netdevice(dev) < 0) |
| 252 | goto failed_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | dev_hold(dev); |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 255 | ipip_tunnel_link(ipn, nt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | return nt; |
| 257 | |
Pavel Emelyanov | b37d428 | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 258 | failed_free: |
| 259 | free_netdev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | return NULL; |
| 261 | } |
| 262 | |
| 263 | static void ipip_tunnel_uninit(struct net_device *dev) |
| 264 | { |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 265 | struct net *net = dev_net(dev); |
| 266 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
| 267 | |
| 268 | if (dev == ipn->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | write_lock_bh(&ipip_lock); |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 270 | ipn->tunnels_wc[0] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | write_unlock_bh(&ipip_lock); |
| 272 | } else |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 273 | ipip_tunnel_unlink(ipn, netdev_priv(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | dev_put(dev); |
| 275 | } |
| 276 | |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 277 | static int ipip_err(struct sk_buff *skb, u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
Rami Rosen | 071f92d | 2008-05-21 17:47:54 -0700 | [diff] [blame] | 280 | /* All the routers (except for Linux) return only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | 8 bytes of packet payload. It means, that precise relaying of |
| 282 | ICMP in the real Internet is absolutely infeasible. |
| 283 | */ |
Jianjun Kong | 5a5f3a8 | 2008-11-03 00:24:34 -0800 | [diff] [blame] | 284 | struct iphdr *iph = (struct iphdr *)skb->data; |
Arnaldo Carvalho de Melo | 88c7664 | 2007-03-13 14:43:18 -0300 | [diff] [blame] | 285 | const int type = icmp_hdr(skb)->type; |
| 286 | const int code = icmp_hdr(skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | struct ip_tunnel *t; |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 288 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
| 290 | switch (type) { |
| 291 | default: |
| 292 | case ICMP_PARAMETERPROB: |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 293 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
| 295 | case ICMP_DEST_UNREACH: |
| 296 | switch (code) { |
| 297 | case ICMP_SR_FAILED: |
| 298 | case ICMP_PORT_UNREACH: |
| 299 | /* Impossible event. */ |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 300 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | case ICMP_FRAG_NEEDED: |
| 302 | /* Soft state for pmtu is maintained by IP core. */ |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 303 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | default: |
| 305 | /* All others are translated to HOST_UNREACH. |
| 306 | rfc2003 contains "deep thoughts" about NET_UNREACH, |
| 307 | I believe they are just ether pollution. --ANK |
| 308 | */ |
| 309 | break; |
| 310 | } |
| 311 | break; |
| 312 | case ICMP_TIME_EXCEEDED: |
| 313 | if (code != ICMP_EXC_TTL) |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 314 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | break; |
| 316 | } |
| 317 | |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 318 | err = -ENOENT; |
| 319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | read_lock(&ipip_lock); |
Pavel Emelyanov | cec3ffa | 2008-04-16 01:05:03 -0700 | [diff] [blame] | 321 | t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | if (t == NULL || t->parms.iph.daddr == 0) |
| 323 | goto out; |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 324 | |
| 325 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
| 327 | goto out; |
| 328 | |
| 329 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) |
| 330 | t->err_count++; |
| 331 | else |
| 332 | t->err_count = 1; |
| 333 | t->err_time = jiffies; |
| 334 | out: |
| 335 | read_unlock(&ipip_lock); |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 336 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } |
| 338 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 339 | static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph, |
| 340 | struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 342 | struct iphdr *inner_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
| 344 | if (INET_ECN_is_ce(outer_iph->tos)) |
| 345 | IP_ECN_set_ce(inner_iph); |
| 346 | } |
| 347 | |
| 348 | static int ipip_rcv(struct sk_buff *skb) |
| 349 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | struct ip_tunnel *tunnel; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 351 | const struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
| 353 | read_lock(&ipip_lock); |
Pavel Emelyanov | cec3ffa | 2008-04-16 01:05:03 -0700 | [diff] [blame] | 354 | if ((tunnel = ipip_tunnel_lookup(dev_net(skb->dev), |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 355 | iph->saddr, iph->daddr)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
| 357 | read_unlock(&ipip_lock); |
| 358 | kfree_skb(skb); |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | secpath_reset(skb); |
| 363 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 364 | skb->mac_header = skb->network_header; |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 365 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | skb->protocol = htons(ETH_P_IP); |
| 367 | skb->pkt_type = PACKET_HOST; |
| 368 | |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 369 | tunnel->dev->stats.rx_packets++; |
| 370 | tunnel->dev->stats.rx_bytes += skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | skb->dev = tunnel->dev; |
| 372 | dst_release(skb->dst); |
| 373 | skb->dst = NULL; |
| 374 | nf_reset(skb); |
| 375 | ipip_ecn_decapsulate(iph, skb); |
| 376 | netif_rx(skb); |
| 377 | read_unlock(&ipip_lock); |
| 378 | return 0; |
| 379 | } |
| 380 | read_unlock(&ipip_lock); |
| 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | return -1; |
| 383 | } |
| 384 | |
| 385 | /* |
| 386 | * This function assumes it is being called from dev_queue_xmit() |
| 387 | * and that skb is filled properly by that function. |
| 388 | */ |
| 389 | |
| 390 | static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
| 391 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 392 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 393 | struct net_device_stats *stats = &tunnel->dev->stats; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | struct iphdr *tiph = &tunnel->parms.iph; |
| 395 | u8 tos = tunnel->parms.iph.tos; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 396 | __be16 df = tiph->frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | struct rtable *rt; /* Route to the other host */ |
| 398 | struct net_device *tdev; /* Device to other host */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 399 | struct iphdr *old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | struct iphdr *iph; /* Our new IP header */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 401 | unsigned int max_headroom; /* The extra header space needed */ |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 402 | __be32 dst = tiph->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | int mtu; |
| 404 | |
| 405 | if (tunnel->recursion++) { |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 406 | stats->collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | goto tx_error; |
| 408 | } |
| 409 | |
| 410 | if (skb->protocol != htons(ETH_P_IP)) |
| 411 | goto tx_error; |
| 412 | |
| 413 | if (tos&1) |
| 414 | tos = old_iph->tos; |
| 415 | |
| 416 | if (!dst) { |
| 417 | /* NBMA tunnel */ |
Eric Dumazet | ee6b967 | 2008-03-05 18:30:47 -0800 | [diff] [blame] | 418 | if ((rt = skb->rtable) == NULL) { |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 419 | stats->tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | goto tx_error; |
| 421 | } |
| 422 | if ((dst = rt->rt_gateway) == 0) |
| 423 | goto tx_error_icmp; |
| 424 | } |
| 425 | |
| 426 | { |
| 427 | struct flowi fl = { .oif = tunnel->parms.link, |
| 428 | .nl_u = { .ip4_u = |
| 429 | { .daddr = dst, |
| 430 | .saddr = tiph->saddr, |
| 431 | .tos = RT_TOS(tos) } }, |
| 432 | .proto = IPPROTO_IPIP }; |
Pavel Emelyanov | b99f015 | 2008-04-16 01:05:57 -0700 | [diff] [blame] | 433 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 434 | stats->tx_carrier_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | goto tx_error_icmp; |
| 436 | } |
| 437 | } |
| 438 | tdev = rt->u.dst.dev; |
| 439 | |
| 440 | if (tdev == dev) { |
| 441 | ip_rt_put(rt); |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 442 | stats->collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | goto tx_error; |
| 444 | } |
| 445 | |
| 446 | if (tiph->frag_off) |
| 447 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); |
| 448 | else |
| 449 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; |
| 450 | |
| 451 | if (mtu < 68) { |
Pavel Emelyanov | 50f59ce | 2008-05-21 14:15:16 -0700 | [diff] [blame] | 452 | stats->collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | ip_rt_put(rt); |
| 454 | goto tx_error; |
| 455 | } |
| 456 | if (skb->dst) |
| 457 | skb->dst->ops->update_pmtu(skb->dst, mtu); |
| 458 | |
| 459 | df |= (old_iph->frag_off&htons(IP_DF)); |
| 460 | |
| 461 | if ((old_iph->frag_off&htons(IP_DF)) && mtu < ntohs(old_iph->tot_len)) { |
| 462 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
| 463 | ip_rt_put(rt); |
| 464 | goto tx_error; |
| 465 | } |
| 466 | |
| 467 | if (tunnel->err_count > 0) { |
| 468 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { |
| 469 | tunnel->err_count--; |
| 470 | dst_link_failure(skb); |
| 471 | } else |
| 472 | tunnel->err_count = 0; |
| 473 | } |
| 474 | |
| 475 | /* |
| 476 | * Okay, now see if we can stuff it in the buffer as-is. |
| 477 | */ |
| 478 | max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); |
| 479 | |
Patrick McHardy | cfbba49 | 2007-07-09 15:33:40 -0700 | [diff] [blame] | 480 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
| 481 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
| 483 | if (!new_skb) { |
| 484 | ip_rt_put(rt); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 485 | stats->tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | dev_kfree_skb(skb); |
| 487 | tunnel->recursion--; |
| 488 | return 0; |
| 489 | } |
| 490 | if (skb->sk) |
| 491 | skb_set_owner_w(new_skb, skb->sk); |
| 492 | dev_kfree_skb(skb); |
| 493 | skb = new_skb; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 494 | old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | } |
| 496 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 497 | skb->transport_header = skb->network_header; |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 498 | skb_push(skb, sizeof(struct iphdr)); |
| 499 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
Patrick McHardy | 48d5cad | 2006-02-15 15:10:22 -0800 | [diff] [blame] | 501 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
| 502 | IPSKB_REROUTED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | dst_release(skb->dst); |
| 504 | skb->dst = &rt->u.dst; |
| 505 | |
| 506 | /* |
| 507 | * Push down and install the IPIP header. |
| 508 | */ |
| 509 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 510 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | iph->version = 4; |
| 512 | iph->ihl = sizeof(struct iphdr)>>2; |
| 513 | iph->frag_off = df; |
| 514 | iph->protocol = IPPROTO_IPIP; |
| 515 | iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); |
| 516 | iph->daddr = rt->rt_dst; |
| 517 | iph->saddr = rt->rt_src; |
| 518 | |
| 519 | if ((iph->ttl = tiph->ttl) == 0) |
| 520 | iph->ttl = old_iph->ttl; |
| 521 | |
| 522 | nf_reset(skb); |
| 523 | |
| 524 | IPTUNNEL_XMIT(); |
| 525 | tunnel->recursion--; |
| 526 | return 0; |
| 527 | |
| 528 | tx_error_icmp: |
| 529 | dst_link_failure(skb); |
| 530 | tx_error: |
| 531 | stats->tx_errors++; |
| 532 | dev_kfree_skb(skb); |
| 533 | tunnel->recursion--; |
| 534 | return 0; |
| 535 | } |
| 536 | |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 537 | static void ipip_tunnel_bind_dev(struct net_device *dev) |
| 538 | { |
| 539 | struct net_device *tdev = NULL; |
| 540 | struct ip_tunnel *tunnel; |
| 541 | struct iphdr *iph; |
| 542 | |
| 543 | tunnel = netdev_priv(dev); |
| 544 | iph = &tunnel->parms.iph; |
| 545 | |
| 546 | if (iph->daddr) { |
| 547 | struct flowi fl = { .oif = tunnel->parms.link, |
| 548 | .nl_u = { .ip4_u = |
| 549 | { .daddr = iph->daddr, |
| 550 | .saddr = iph->saddr, |
| 551 | .tos = RT_TOS(iph->tos) } }, |
| 552 | .proto = IPPROTO_IPIP }; |
| 553 | struct rtable *rt; |
Pavel Emelyanov | b99f015 | 2008-04-16 01:05:57 -0700 | [diff] [blame] | 554 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 555 | tdev = rt->u.dst.dev; |
| 556 | ip_rt_put(rt); |
| 557 | } |
| 558 | dev->flags |= IFF_POINTOPOINT; |
| 559 | } |
| 560 | |
| 561 | if (!tdev && tunnel->parms.link) |
Pavel Emelyanov | b99f015 | 2008-04-16 01:05:57 -0700 | [diff] [blame] | 562 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 563 | |
| 564 | if (tdev) { |
| 565 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); |
| 566 | dev->mtu = tdev->mtu - sizeof(struct iphdr); |
| 567 | } |
| 568 | dev->iflink = tunnel->parms.link; |
| 569 | } |
| 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | static int |
| 572 | ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) |
| 573 | { |
| 574 | int err = 0; |
| 575 | struct ip_tunnel_parm p; |
| 576 | struct ip_tunnel *t; |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 577 | struct net *net = dev_net(dev); |
| 578 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
| 580 | switch (cmd) { |
| 581 | case SIOCGETTUNNEL: |
| 582 | t = NULL; |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 583 | if (dev == ipn->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| 585 | err = -EFAULT; |
| 586 | break; |
| 587 | } |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 588 | t = ipip_tunnel_locate(net, &p, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | } |
| 590 | if (t == NULL) |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 591 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | memcpy(&p, &t->parms, sizeof(p)); |
| 593 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 594 | err = -EFAULT; |
| 595 | break; |
| 596 | |
| 597 | case SIOCADDTUNNEL: |
| 598 | case SIOCCHGTUNNEL: |
| 599 | err = -EPERM; |
| 600 | if (!capable(CAP_NET_ADMIN)) |
| 601 | goto done; |
| 602 | |
| 603 | err = -EFAULT; |
| 604 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 605 | goto done; |
| 606 | |
| 607 | err = -EINVAL; |
| 608 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || |
| 609 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) |
| 610 | goto done; |
| 611 | if (p.iph.ttl) |
| 612 | p.iph.frag_off |= htons(IP_DF); |
| 613 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 614 | t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 616 | if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | if (t != NULL) { |
| 618 | if (t->dev != dev) { |
| 619 | err = -EEXIST; |
| 620 | break; |
| 621 | } |
| 622 | } else { |
| 623 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || |
| 624 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { |
| 625 | err = -EINVAL; |
| 626 | break; |
| 627 | } |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 628 | t = netdev_priv(dev); |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 629 | ipip_tunnel_unlink(ipn, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | t->parms.iph.saddr = p.iph.saddr; |
| 631 | t->parms.iph.daddr = p.iph.daddr; |
| 632 | memcpy(dev->dev_addr, &p.iph.saddr, 4); |
| 633 | memcpy(dev->broadcast, &p.iph.daddr, 4); |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 634 | ipip_tunnel_link(ipn, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | netdev_state_change(dev); |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | if (t) { |
| 640 | err = 0; |
| 641 | if (cmd == SIOCCHGTUNNEL) { |
| 642 | t->parms.iph.ttl = p.iph.ttl; |
| 643 | t->parms.iph.tos = p.iph.tos; |
| 644 | t->parms.iph.frag_off = p.iph.frag_off; |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 645 | if (t->parms.link != p.link) { |
| 646 | t->parms.link = p.link; |
| 647 | ipip_tunnel_bind_dev(dev); |
| 648 | netdev_state_change(dev); |
| 649 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | } |
| 651 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
| 652 | err = -EFAULT; |
| 653 | } else |
| 654 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
| 655 | break; |
| 656 | |
| 657 | case SIOCDELTUNNEL: |
| 658 | err = -EPERM; |
| 659 | if (!capable(CAP_NET_ADMIN)) |
| 660 | goto done; |
| 661 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 662 | if (dev == ipn->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | err = -EFAULT; |
| 664 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 665 | goto done; |
| 666 | err = -ENOENT; |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 667 | if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | goto done; |
| 669 | err = -EPERM; |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 670 | if (t->dev == ipn->fb_tunnel_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | goto done; |
| 672 | dev = t->dev; |
| 673 | } |
Stephen Hemminger | 22f8cde | 2007-02-07 00:09:58 -0800 | [diff] [blame] | 674 | unregister_netdevice(dev); |
| 675 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | break; |
| 677 | |
| 678 | default: |
| 679 | err = -EINVAL; |
| 680 | } |
| 681 | |
| 682 | done: |
| 683 | return err; |
| 684 | } |
| 685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
| 687 | { |
| 688 | if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) |
| 689 | return -EINVAL; |
| 690 | dev->mtu = new_mtu; |
| 691 | return 0; |
| 692 | } |
| 693 | |
| 694 | static void ipip_tunnel_setup(struct net_device *dev) |
| 695 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | dev->uninit = ipip_tunnel_uninit; |
| 697 | dev->hard_start_xmit = ipip_tunnel_xmit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | dev->do_ioctl = ipip_tunnel_ioctl; |
| 699 | dev->change_mtu = ipip_tunnel_change_mtu; |
| 700 | dev->destructor = free_netdev; |
| 701 | |
| 702 | dev->type = ARPHRD_TUNNEL; |
| 703 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 704 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | dev->flags = IFF_NOARP; |
| 706 | dev->iflink = 0; |
| 707 | dev->addr_len = 4; |
Pavel Emelyanov | 0a82640 | 2008-04-16 01:06:18 -0700 | [diff] [blame] | 708 | dev->features |= NETIF_F_NETNS_LOCAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } |
| 710 | |
| 711 | static int ipip_tunnel_init(struct net_device *dev) |
| 712 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | struct ip_tunnel *tunnel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 715 | tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | |
| 717 | tunnel->dev = dev; |
| 718 | strcpy(tunnel->parms.name, dev->name); |
| 719 | |
| 720 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); |
| 721 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); |
| 722 | |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 723 | ipip_tunnel_bind_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | |
| 725 | return 0; |
| 726 | } |
| 727 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 728 | static int ipip_fb_tunnel_init(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 730 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | struct iphdr *iph = &tunnel->parms.iph; |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 732 | struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
| 734 | tunnel->dev = dev; |
| 735 | strcpy(tunnel->parms.name, dev->name); |
| 736 | |
| 737 | iph->version = 4; |
| 738 | iph->protocol = IPPROTO_IPIP; |
| 739 | iph->ihl = 5; |
| 740 | |
| 741 | dev_hold(dev); |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 742 | ipn->tunnels_wc[0] = tunnel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | return 0; |
| 744 | } |
| 745 | |
| 746 | static struct xfrm_tunnel ipip_handler = { |
| 747 | .handler = ipip_rcv, |
| 748 | .err_handler = ipip_err, |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 749 | .priority = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | }; |
| 751 | |
| 752 | static char banner[] __initdata = |
| 753 | KERN_INFO "IPv4 over IPv4 tunneling driver\n"; |
| 754 | |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 755 | static void ipip_destroy_tunnels(struct ipip_net *ipn) |
| 756 | { |
| 757 | int prio; |
| 758 | |
| 759 | for (prio = 1; prio < 4; prio++) { |
| 760 | int h; |
| 761 | for (h = 0; h < HASH_SIZE; h++) { |
| 762 | struct ip_tunnel *t; |
| 763 | while ((t = ipn->tunnels[prio][h]) != NULL) |
| 764 | unregister_netdevice(t->dev); |
| 765 | } |
| 766 | } |
| 767 | } |
| 768 | |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 769 | static int ipip_init_net(struct net *net) |
| 770 | { |
| 771 | int err; |
| 772 | struct ipip_net *ipn; |
| 773 | |
| 774 | err = -ENOMEM; |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 775 | ipn = kzalloc(sizeof(struct ipip_net), GFP_KERNEL); |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 776 | if (ipn == NULL) |
| 777 | goto err_alloc; |
| 778 | |
| 779 | err = net_assign_generic(net, ipip_net_id, ipn); |
| 780 | if (err < 0) |
| 781 | goto err_assign; |
| 782 | |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 783 | ipn->tunnels[0] = ipn->tunnels_wc; |
| 784 | ipn->tunnels[1] = ipn->tunnels_l; |
| 785 | ipn->tunnels[2] = ipn->tunnels_r; |
| 786 | ipn->tunnels[3] = ipn->tunnels_r_l; |
| 787 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 788 | ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), |
| 789 | "tunl0", |
| 790 | ipip_tunnel_setup); |
| 791 | if (!ipn->fb_tunnel_dev) { |
| 792 | err = -ENOMEM; |
| 793 | goto err_alloc_dev; |
| 794 | } |
| 795 | |
| 796 | ipn->fb_tunnel_dev->init = ipip_fb_tunnel_init; |
| 797 | dev_net_set(ipn->fb_tunnel_dev, net); |
| 798 | |
| 799 | if ((err = register_netdev(ipn->fb_tunnel_dev))) |
| 800 | goto err_reg_dev; |
| 801 | |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 802 | return 0; |
| 803 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 804 | err_reg_dev: |
| 805 | free_netdev(ipn->fb_tunnel_dev); |
| 806 | err_alloc_dev: |
| 807 | /* nothing */ |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 808 | err_assign: |
| 809 | kfree(ipn); |
| 810 | err_alloc: |
| 811 | return err; |
| 812 | } |
| 813 | |
| 814 | static void ipip_exit_net(struct net *net) |
| 815 | { |
| 816 | struct ipip_net *ipn; |
| 817 | |
| 818 | ipn = net_generic(net, ipip_net_id); |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 819 | rtnl_lock(); |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 820 | ipip_destroy_tunnels(ipn); |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 821 | unregister_netdevice(ipn->fb_tunnel_dev); |
| 822 | rtnl_unlock(); |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 823 | kfree(ipn); |
| 824 | } |
| 825 | |
| 826 | static struct pernet_operations ipip_net_ops = { |
| 827 | .init = ipip_init_net, |
| 828 | .exit = ipip_exit_net, |
| 829 | }; |
| 830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | static int __init ipip_init(void) |
| 832 | { |
| 833 | int err; |
| 834 | |
| 835 | printk(banner); |
| 836 | |
Kazunori MIYAZAWA | c0d5640 | 2007-02-13 12:54:47 -0800 | [diff] [blame] | 837 | if (xfrm4_tunnel_register(&ipip_handler, AF_INET)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | printk(KERN_INFO "ipip init: can't register tunnel\n"); |
| 839 | return -EAGAIN; |
| 840 | } |
| 841 | |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 842 | err = register_pernet_gen_device(&ipip_net_id, &ipip_net_ops); |
| 843 | if (err) |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 844 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
| 845 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | } |
| 848 | |
| 849 | static void __exit ipip_fini(void) |
| 850 | { |
Kazunori MIYAZAWA | c0d5640 | 2007-02-13 12:54:47 -0800 | [diff] [blame] | 851 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | printk(KERN_INFO "ipip close: can't deregister tunnel\n"); |
| 853 | |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 854 | unregister_pernet_gen_device(ipip_net_id, &ipip_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | module_init(ipip_init); |
| 858 | module_exit(ipip_fini); |
| 859 | MODULE_LICENSE("GPL"); |