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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 98 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | #include <asm/uaccess.h> |
| 100 | #include <linux/skbuff.h> |
| 101 | #include <linux/netdevice.h> |
| 102 | #include <linux/in.h> |
| 103 | #include <linux/tcp.h> |
| 104 | #include <linux/udp.h> |
| 105 | #include <linux/if_arp.h> |
| 106 | #include <linux/mroute.h> |
| 107 | #include <linux/init.h> |
| 108 | #include <linux/netfilter_ipv4.h> |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 109 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | #include <net/sock.h> |
| 112 | #include <net/ip.h> |
| 113 | #include <net/icmp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | #include <net/ipip.h> |
| 115 | #include <net/inet_ecn.h> |
| 116 | #include <net/xfrm.h> |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 117 | #include <net/net_namespace.h> |
| 118 | #include <net/netns/generic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | #define HASH_SIZE 16 |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 121 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
stephen hemminger | eccc1bb | 2012-09-25 11:02:48 +0000 | [diff] [blame] | 123 | static bool log_ecn_error = true; |
| 124 | module_param(log_ecn_error, bool, 0644); |
| 125 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
| 126 | |
Eric Dumazet | f99189b | 2009-11-17 10:42:49 +0000 | [diff] [blame] | 127 | static int ipip_net_id __read_mostly; |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 128 | struct ipip_net { |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 129 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; |
| 130 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; |
| 131 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; |
| 132 | struct ip_tunnel __rcu *tunnels_wc[1]; |
| 133 | struct ip_tunnel __rcu **tunnels[4]; |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 134 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 135 | struct net_device *fb_tunnel_dev; |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 136 | }; |
| 137 | |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 138 | static int ipip_tunnel_init(struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | static void ipip_tunnel_setup(struct net_device *dev); |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 140 | static void ipip_dev_free(struct net_device *dev); |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 141 | static struct rtnl_link_ops ipip_link_ops __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 143 | static struct rtnl_link_stats64 *ipip_get_stats64(struct net_device *dev, |
| 144 | struct rtnl_link_stats64 *tot) |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 145 | { |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 146 | int i; |
| 147 | |
| 148 | for_each_possible_cpu(i) { |
| 149 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 150 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
| 151 | unsigned int start; |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 152 | |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 153 | do { |
| 154 | start = u64_stats_fetch_begin_bh(&tstats->syncp); |
| 155 | rx_packets = tstats->rx_packets; |
| 156 | tx_packets = tstats->tx_packets; |
| 157 | rx_bytes = tstats->rx_bytes; |
| 158 | tx_bytes = tstats->tx_bytes; |
| 159 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); |
| 160 | |
| 161 | tot->rx_packets += rx_packets; |
| 162 | tot->tx_packets += tx_packets; |
| 163 | tot->rx_bytes += rx_bytes; |
| 164 | tot->tx_bytes += tx_bytes; |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 165 | } |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 166 | |
| 167 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
| 168 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; |
| 169 | tot->tx_dropped = dev->stats.tx_dropped; |
| 170 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; |
| 171 | tot->tx_errors = dev->stats.tx_errors; |
| 172 | tot->collisions = dev->stats.collisions; |
| 173 | |
| 174 | return tot; |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 175 | } |
| 176 | |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 177 | static struct ip_tunnel *ipip_tunnel_lookup(struct net *net, |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 178 | __be32 remote, __be32 local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 180 | unsigned int h0 = HASH(remote); |
| 181 | unsigned int h1 = HASH(local); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | struct ip_tunnel *t; |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 183 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | |
Amerigo Wang | e086cad | 2012-11-11 21:52:34 +0000 | [diff] [blame] | 185 | for_each_ip_tunnel_rcu(t, ipn->tunnels_r_l[h0 ^ h1]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | if (local == t->parms.iph.saddr && |
| 187 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
| 188 | return t; |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 189 | |
Amerigo Wang | e086cad | 2012-11-11 21:52:34 +0000 | [diff] [blame] | 190 | for_each_ip_tunnel_rcu(t, ipn->tunnels_r[h0]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
| 192 | return t; |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 193 | |
Amerigo Wang | e086cad | 2012-11-11 21:52:34 +0000 | [diff] [blame] | 194 | for_each_ip_tunnel_rcu(t, ipn->tunnels_l[h1]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
| 196 | return t; |
Eric Dumazet | 8f95dd6 | 2009-10-23 05:42:02 +0000 | [diff] [blame] | 197 | |
| 198 | t = rcu_dereference(ipn->tunnels_wc[0]); |
| 199 | if (t && (t->dev->flags&IFF_UP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | return t; |
| 201 | return NULL; |
| 202 | } |
| 203 | |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 204 | static struct ip_tunnel __rcu **__ipip_bucket(struct ipip_net *ipn, |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 205 | struct ip_tunnel_parm *parms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | { |
YOSHIFUJI Hideaki | 87d1a16 | 2007-04-24 20:44:47 +0900 | [diff] [blame] | 207 | __be32 remote = parms->iph.daddr; |
| 208 | __be32 local = parms->iph.saddr; |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 209 | unsigned int h = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | int prio = 0; |
| 211 | |
| 212 | if (remote) { |
| 213 | prio |= 2; |
| 214 | h ^= HASH(remote); |
| 215 | } |
| 216 | if (local) { |
| 217 | prio |= 1; |
| 218 | h ^= HASH(local); |
| 219 | } |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 220 | return &ipn->tunnels[prio][h]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 223 | static inline struct ip_tunnel __rcu **ipip_bucket(struct ipip_net *ipn, |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 224 | struct ip_tunnel *t) |
YOSHIFUJI Hideaki | 87d1a16 | 2007-04-24 20:44:47 +0900 | [diff] [blame] | 225 | { |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 226 | return __ipip_bucket(ipn, &t->parms); |
YOSHIFUJI Hideaki | 87d1a16 | 2007-04-24 20:44:47 +0900 | [diff] [blame] | 227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 229 | 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] | 230 | { |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 231 | struct ip_tunnel __rcu **tp; |
| 232 | struct ip_tunnel *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 234 | for (tp = ipip_bucket(ipn, t); |
| 235 | (iter = rtnl_dereference(*tp)) != NULL; |
| 236 | tp = &iter->next) { |
| 237 | if (t == iter) { |
Eric Dumazet | cf778b0 | 2012-01-12 04:41:32 +0000 | [diff] [blame] | 238 | rcu_assign_pointer(*tp, t->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | break; |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 244 | 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] | 245 | { |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 246 | struct ip_tunnel __rcu **tp = ipip_bucket(ipn, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Eric Dumazet | cf778b0 | 2012-01-12 04:41:32 +0000 | [diff] [blame] | 248 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
| 249 | rcu_assign_pointer(*tp, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } |
| 251 | |
Nicolas Dichtel | be42da0 | 2012-11-14 05:14:03 +0000 | [diff] [blame] | 252 | static int ipip_tunnel_create(struct net_device *dev) |
| 253 | { |
| 254 | struct ip_tunnel *t = netdev_priv(dev); |
| 255 | struct net *net = dev_net(dev); |
| 256 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
| 257 | int err; |
| 258 | |
| 259 | err = ipip_tunnel_init(dev); |
| 260 | if (err < 0) |
| 261 | goto out; |
| 262 | |
| 263 | err = register_netdevice(dev); |
| 264 | if (err < 0) |
| 265 | goto out; |
| 266 | |
| 267 | strcpy(t->parms.name, dev->name); |
| 268 | dev->rtnl_link_ops = &ipip_link_ops; |
| 269 | |
| 270 | dev_hold(dev); |
| 271 | ipip_tunnel_link(ipn, t); |
| 272 | return 0; |
| 273 | |
| 274 | out: |
| 275 | return err; |
| 276 | } |
| 277 | |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 278 | static struct ip_tunnel *ipip_tunnel_locate(struct net *net, |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 279 | struct ip_tunnel_parm *parms, int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | { |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 281 | __be32 remote = parms->iph.daddr; |
| 282 | __be32 local = parms->iph.saddr; |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 283 | struct ip_tunnel *t, *nt; |
| 284 | struct ip_tunnel __rcu **tp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | char name[IFNAMSIZ]; |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 287 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 289 | for (tp = __ipip_bucket(ipn, parms); |
| 290 | (t = rtnl_dereference(*tp)) != NULL; |
| 291 | tp = &t->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
| 293 | return t; |
| 294 | } |
| 295 | if (!create) |
| 296 | return NULL; |
| 297 | |
| 298 | if (parms->name[0]) |
| 299 | strlcpy(name, parms->name, IFNAMSIZ); |
Pavel Emelyanov | 34cc7ba | 2008-02-23 20:19:20 -0800 | [diff] [blame] | 300 | else |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 301 | strcpy(name, "tunl%d"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
| 303 | dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); |
| 304 | if (dev == NULL) |
| 305 | return NULL; |
| 306 | |
Pavel Emelyanov | 0a82640 | 2008-04-16 01:06:18 -0700 | [diff] [blame] | 307 | dev_net_set(dev, net); |
| 308 | |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 309 | nt = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | nt->parms = *parms; |
| 311 | |
Nicolas Dichtel | be42da0 | 2012-11-14 05:14:03 +0000 | [diff] [blame] | 312 | if (ipip_tunnel_create(dev) < 0) |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 313 | goto failed_free; |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | return nt; |
| 316 | |
Pavel Emelyanov | b37d428b | 2008-02-26 23:51:04 -0800 | [diff] [blame] | 317 | failed_free: |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 318 | ipip_dev_free(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | return NULL; |
| 320 | } |
| 321 | |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 322 | /* called with RTNL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | static void ipip_tunnel_uninit(struct net_device *dev) |
| 324 | { |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 325 | struct net *net = dev_net(dev); |
| 326 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
| 327 | |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 328 | if (dev == ipn->fb_tunnel_dev) |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 329 | RCU_INIT_POINTER(ipn->tunnels_wc[0], NULL); |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 330 | else |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 331 | ipip_tunnel_unlink(ipn, netdev_priv(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | dev_put(dev); |
| 333 | } |
| 334 | |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 335 | static int ipip_err(struct sk_buff *skb, u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
Rami Rosen | 071f92d | 2008-05-21 17:47:54 -0700 | [diff] [blame] | 338 | /* All the routers (except for Linux) return only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | 8 bytes of packet payload. It means, that precise relaying of |
| 340 | ICMP in the real Internet is absolutely infeasible. |
| 341 | */ |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 342 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
Arnaldo Carvalho de Melo | 88c7664 | 2007-03-13 14:43:18 -0300 | [diff] [blame] | 343 | const int type = icmp_hdr(skb)->type; |
| 344 | const int code = icmp_hdr(skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | struct ip_tunnel *t; |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 346 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
| 348 | switch (type) { |
| 349 | default: |
| 350 | case ICMP_PARAMETERPROB: |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 351 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
| 353 | case ICMP_DEST_UNREACH: |
| 354 | switch (code) { |
| 355 | case ICMP_SR_FAILED: |
| 356 | case ICMP_PORT_UNREACH: |
| 357 | /* Impossible event. */ |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 358 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | default: |
| 360 | /* All others are translated to HOST_UNREACH. |
| 361 | rfc2003 contains "deep thoughts" about NET_UNREACH, |
| 362 | I believe they are just ether pollution. --ANK |
| 363 | */ |
| 364 | break; |
| 365 | } |
| 366 | break; |
| 367 | case ICMP_TIME_EXCEEDED: |
| 368 | if (code != ICMP_EXC_TTL) |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 369 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | break; |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 371 | case ICMP_REDIRECT: |
| 372 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | } |
| 374 | |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 375 | err = -ENOENT; |
Pavel Emelyanov | cec3ffa | 2008-04-16 01:05:03 -0700 | [diff] [blame] | 376 | t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 377 | if (t == NULL) |
| 378 | goto out; |
| 379 | |
| 380 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { |
| 381 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, |
| 382 | t->dev->ifindex, 0, IPPROTO_IPIP, 0); |
| 383 | err = 0; |
| 384 | goto out; |
| 385 | } |
| 386 | |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 387 | if (type == ICMP_REDIRECT) { |
| 388 | ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, |
| 389 | IPPROTO_IPIP, 0); |
| 390 | err = 0; |
| 391 | goto out; |
| 392 | } |
| 393 | |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 394 | if (t->parms.iph.daddr == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | goto out; |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 396 | |
| 397 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
| 399 | goto out; |
| 400 | |
Wei Yongjun | 26d94b4 | 2009-02-24 23:36:47 -0800 | [diff] [blame] | 401 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | t->err_count++; |
| 403 | else |
| 404 | t->err_count = 1; |
| 405 | t->err_time = jiffies; |
| 406 | out: |
stephen hemminger | b0558ef | 2012-09-24 18:12:25 +0000 | [diff] [blame] | 407 | |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 408 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | } |
| 410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | static int ipip_rcv(struct sk_buff *skb) |
| 412 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | struct ip_tunnel *tunnel; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 414 | const struct iphdr *iph = ip_hdr(skb); |
stephen hemminger | eccc1bb | 2012-09-25 11:02:48 +0000 | [diff] [blame] | 415 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 417 | tunnel = ipip_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr); |
| 418 | if (tunnel != NULL) { |
| 419 | struct pcpu_tstats *tstats; |
| 420 | |
stephen hemminger | eccc1bb | 2012-09-25 11:02:48 +0000 | [diff] [blame] | 421 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 422 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
| 424 | secpath_reset(skb); |
| 425 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 426 | skb->mac_header = skb->network_header; |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 427 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | skb->protocol = htons(ETH_P_IP); |
| 429 | skb->pkt_type = PACKET_HOST; |
| 430 | |
stephen hemminger | eccc1bb | 2012-09-25 11:02:48 +0000 | [diff] [blame] | 431 | __skb_tunnel_rx(skb, tunnel->dev); |
| 432 | |
| 433 | err = IP_ECN_decapsulate(iph, skb); |
| 434 | if (unlikely(err)) { |
| 435 | if (log_ecn_error) |
| 436 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", |
| 437 | &iph->saddr, iph->tos); |
| 438 | if (err > 1) { |
| 439 | ++tunnel->dev->stats.rx_frame_errors; |
| 440 | ++tunnel->dev->stats.rx_errors; |
| 441 | goto drop; |
| 442 | } |
| 443 | } |
| 444 | |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 445 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 446 | u64_stats_update_begin(&tstats->syncp); |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 447 | tstats->rx_packets++; |
| 448 | tstats->rx_bytes += skb->len; |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 449 | u64_stats_update_end(&tstats->syncp); |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 450 | |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 451 | netif_rx(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | return 0; |
| 453 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | return -1; |
stephen hemminger | eccc1bb | 2012-09-25 11:02:48 +0000 | [diff] [blame] | 456 | |
| 457 | drop: |
| 458 | kfree_skb(skb); |
| 459 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | /* |
| 463 | * This function assumes it is being called from dev_queue_xmit() |
| 464 | * and that skb is filled properly by that function. |
| 465 | */ |
| 466 | |
Stephen Hemminger | 6fef4c0 | 2009-08-31 19:50:41 +0000 | [diff] [blame] | 467 | 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] | 468 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 469 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 470 | const struct iphdr *tiph = &tunnel->parms.iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | u8 tos = tunnel->parms.iph.tos; |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 472 | __be16 df = tiph->frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | struct rtable *rt; /* Route to the other host */ |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 474 | struct net_device *tdev; /* Device to other host */ |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 475 | const struct iphdr *old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | struct iphdr *iph; /* Our new IP header */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 477 | unsigned int max_headroom; /* The extra header space needed */ |
Al Viro | d5a0a1e | 2006-11-08 00:23:14 -0800 | [diff] [blame] | 478 | __be32 dst = tiph->daddr; |
David S. Miller | 31e4543d | 2011-05-03 20:25:42 -0700 | [diff] [blame] | 479 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | int mtu; |
| 481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | if (skb->protocol != htons(ETH_P_IP)) |
| 483 | goto tx_error; |
| 484 | |
Eric Dumazet | c3b89fb | 2012-11-08 09:59:52 +0000 | [diff] [blame] | 485 | if (skb->ip_summed == CHECKSUM_PARTIAL && |
| 486 | skb_checksum_help(skb)) |
| 487 | goto tx_error; |
| 488 | |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 489 | if (tos & 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | tos = old_iph->tos; |
| 491 | |
| 492 | if (!dst) { |
| 493 | /* NBMA tunnel */ |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 494 | if ((rt = skb_rtable(skb)) == NULL) { |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 495 | dev->stats.tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | goto tx_error; |
| 497 | } |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 498 | dst = rt_nexthop(rt, old_iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
| 500 | |
David S. Miller | 31e4543d | 2011-05-03 20:25:42 -0700 | [diff] [blame] | 501 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
David S. Miller | 78fbfd8 | 2011-03-12 00:00:52 -0500 | [diff] [blame] | 502 | dst, tiph->saddr, |
| 503 | 0, 0, |
| 504 | IPPROTO_IPIP, RT_TOS(tos), |
| 505 | tunnel->parms.link); |
| 506 | if (IS_ERR(rt)) { |
| 507 | dev->stats.tx_carrier_errors++; |
| 508 | goto tx_error_icmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 510 | tdev = rt->dst.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
| 512 | if (tdev == dev) { |
| 513 | ip_rt_put(rt); |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 514 | dev->stats.collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | goto tx_error; |
| 516 | } |
| 517 | |
Herbert Xu | 23ca0c9 | 2009-11-06 10:37:41 +0000 | [diff] [blame] | 518 | df |= old_iph->frag_off & htons(IP_DF); |
| 519 | |
| 520 | if (df) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 521 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | |
Herbert Xu | 23ca0c9 | 2009-11-06 10:37:41 +0000 | [diff] [blame] | 523 | if (mtu < 68) { |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 524 | dev->stats.collisions++; |
Herbert Xu | 23ca0c9 | 2009-11-06 10:37:41 +0000 | [diff] [blame] | 525 | ip_rt_put(rt); |
| 526 | goto tx_error; |
| 527 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
Herbert Xu | 23ca0c9 | 2009-11-06 10:37:41 +0000 | [diff] [blame] | 529 | if (skb_dst(skb)) |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 530 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
Herbert Xu | 23ca0c9 | 2009-11-06 10:37:41 +0000 | [diff] [blame] | 532 | if ((old_iph->frag_off & htons(IP_DF)) && |
| 533 | mtu < ntohs(old_iph->tot_len)) { |
| 534 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
| 535 | htonl(mtu)); |
| 536 | ip_rt_put(rt); |
| 537 | goto tx_error; |
| 538 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | if (tunnel->err_count > 0) { |
Wei Yongjun | 26d94b4 | 2009-02-24 23:36:47 -0800 | [diff] [blame] | 542 | if (time_before(jiffies, |
| 543 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | tunnel->err_count--; |
| 545 | dst_link_failure(skb); |
| 546 | } else |
| 547 | tunnel->err_count = 0; |
| 548 | } |
| 549 | |
| 550 | /* |
| 551 | * Okay, now see if we can stuff it in the buffer as-is. |
| 552 | */ |
| 553 | max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); |
| 554 | |
Patrick McHardy | cfbba49 | 2007-07-09 15:33:40 -0700 | [diff] [blame] | 555 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
| 556 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
| 558 | if (!new_skb) { |
| 559 | ip_rt_put(rt); |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 560 | dev->stats.tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 562 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | if (skb->sk) |
| 565 | skb_set_owner_w(new_skb, skb->sk); |
| 566 | dev_kfree_skb(skb); |
| 567 | skb = new_skb; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 568 | old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | } |
| 570 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 571 | skb->transport_header = skb->network_header; |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 572 | skb_push(skb, sizeof(struct iphdr)); |
| 573 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
Patrick McHardy | 48d5cad | 2006-02-15 15:10:22 -0800 | [diff] [blame] | 575 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
| 576 | IPSKB_REROUTED); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 577 | skb_dst_drop(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 578 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
| 580 | /* |
| 581 | * Push down and install the IPIP header. |
| 582 | */ |
| 583 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 584 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | iph->version = 4; |
| 586 | iph->ihl = sizeof(struct iphdr)>>2; |
| 587 | iph->frag_off = df; |
| 588 | iph->protocol = IPPROTO_IPIP; |
| 589 | iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); |
David S. Miller | 69458cb | 2011-05-04 11:10:28 -0700 | [diff] [blame] | 590 | iph->daddr = fl4.daddr; |
| 591 | iph->saddr = fl4.saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
| 593 | if ((iph->ttl = tiph->ttl) == 0) |
| 594 | iph->ttl = old_iph->ttl; |
| 595 | |
Amerigo Wang | aa0010f | 2012-11-11 21:52:33 +0000 | [diff] [blame] | 596 | iptunnel_xmit(skb, dev); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 597 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
| 599 | tx_error_icmp: |
| 600 | dst_link_failure(skb); |
| 601 | tx_error: |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 602 | dev->stats.tx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 604 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | } |
| 606 | |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 607 | static void ipip_tunnel_bind_dev(struct net_device *dev) |
| 608 | { |
| 609 | struct net_device *tdev = NULL; |
| 610 | struct ip_tunnel *tunnel; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 611 | const struct iphdr *iph; |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 612 | |
| 613 | tunnel = netdev_priv(dev); |
| 614 | iph = &tunnel->parms.iph; |
| 615 | |
| 616 | if (iph->daddr) { |
David S. Miller | 31e4543d | 2011-05-03 20:25:42 -0700 | [diff] [blame] | 617 | struct rtable *rt; |
| 618 | struct flowi4 fl4; |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 619 | |
David S. Miller | 31e4543d | 2011-05-03 20:25:42 -0700 | [diff] [blame] | 620 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
| 621 | iph->daddr, iph->saddr, |
| 622 | 0, 0, |
| 623 | IPPROTO_IPIP, |
| 624 | RT_TOS(iph->tos), |
| 625 | tunnel->parms.link); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 626 | if (!IS_ERR(rt)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 627 | tdev = rt->dst.dev; |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 628 | ip_rt_put(rt); |
| 629 | } |
| 630 | dev->flags |= IFF_POINTOPOINT; |
| 631 | } |
| 632 | |
| 633 | if (!tdev && tunnel->parms.link) |
Pavel Emelyanov | b99f015 | 2008-04-16 01:05:57 -0700 | [diff] [blame] | 634 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 635 | |
| 636 | if (tdev) { |
| 637 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); |
| 638 | dev->mtu = tdev->mtu - sizeof(struct iphdr); |
| 639 | } |
| 640 | dev->iflink = tunnel->parms.link; |
| 641 | } |
| 642 | |
Nicolas Dichtel | be42da0 | 2012-11-14 05:14:03 +0000 | [diff] [blame] | 643 | static void ipip_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) |
| 644 | { |
| 645 | struct net *net = dev_net(t->dev); |
| 646 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
| 647 | |
| 648 | ipip_tunnel_unlink(ipn, t); |
| 649 | synchronize_net(); |
| 650 | t->parms.iph.saddr = p->iph.saddr; |
| 651 | t->parms.iph.daddr = p->iph.daddr; |
| 652 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); |
| 653 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); |
| 654 | ipip_tunnel_link(ipn, t); |
| 655 | t->parms.iph.ttl = p->iph.ttl; |
| 656 | t->parms.iph.tos = p->iph.tos; |
| 657 | t->parms.iph.frag_off = p->iph.frag_off; |
| 658 | if (t->parms.link != p->link) { |
| 659 | t->parms.link = p->link; |
| 660 | ipip_tunnel_bind_dev(t->dev); |
| 661 | } |
| 662 | netdev_state_change(t->dev); |
| 663 | } |
| 664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | static int |
| 666 | ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) |
| 667 | { |
| 668 | int err = 0; |
| 669 | struct ip_tunnel_parm p; |
| 670 | struct ip_tunnel *t; |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 671 | struct net *net = dev_net(dev); |
| 672 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
| 674 | switch (cmd) { |
| 675 | case SIOCGETTUNNEL: |
| 676 | t = NULL; |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 677 | if (dev == ipn->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| 679 | err = -EFAULT; |
| 680 | break; |
| 681 | } |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 682 | t = ipip_tunnel_locate(net, &p, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } |
| 684 | if (t == NULL) |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 685 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | memcpy(&p, &t->parms, sizeof(p)); |
| 687 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 688 | err = -EFAULT; |
| 689 | break; |
| 690 | |
| 691 | case SIOCADDTUNNEL: |
| 692 | case SIOCCHGTUNNEL: |
| 693 | err = -EPERM; |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 694 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | goto done; |
| 696 | |
| 697 | err = -EFAULT; |
| 698 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 699 | goto done; |
| 700 | |
| 701 | err = -EINVAL; |
| 702 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || |
| 703 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) |
| 704 | goto done; |
| 705 | if (p.iph.ttl) |
| 706 | p.iph.frag_off |= htons(IP_DF); |
| 707 | |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 708 | t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 710 | if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | if (t != NULL) { |
| 712 | if (t->dev != dev) { |
| 713 | err = -EEXIST; |
| 714 | break; |
| 715 | } |
| 716 | } else { |
| 717 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || |
| 718 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { |
| 719 | err = -EINVAL; |
| 720 | break; |
| 721 | } |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 722 | t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | } |
Nicolas Dichtel | c38cc4b | 2012-11-14 05:14:01 +0000 | [diff] [blame] | 724 | |
Nicolas Dichtel | be42da0 | 2012-11-14 05:14:03 +0000 | [diff] [blame] | 725 | ipip_tunnel_update(t, &p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | } |
| 727 | |
| 728 | if (t) { |
| 729 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
| 731 | err = -EFAULT; |
| 732 | } else |
| 733 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
| 734 | break; |
| 735 | |
| 736 | case SIOCDELTUNNEL: |
| 737 | err = -EPERM; |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 738 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | goto done; |
| 740 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 741 | if (dev == ipn->fb_tunnel_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | err = -EFAULT; |
| 743 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 744 | goto done; |
| 745 | err = -ENOENT; |
Pavel Emelyanov | b9fae5c | 2008-04-16 01:04:35 -0700 | [diff] [blame] | 746 | if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | goto done; |
| 748 | err = -EPERM; |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 749 | if (t->dev == ipn->fb_tunnel_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | goto done; |
| 751 | dev = t->dev; |
| 752 | } |
Stephen Hemminger | 22f8cde | 2007-02-07 00:09:58 -0800 | [diff] [blame] | 753 | unregister_netdevice(dev); |
| 754 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | break; |
| 756 | |
| 757 | default: |
| 758 | err = -EINVAL; |
| 759 | } |
| 760 | |
| 761 | done: |
| 762 | return err; |
| 763 | } |
| 764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
| 766 | { |
| 767 | if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) |
| 768 | return -EINVAL; |
| 769 | dev->mtu = new_mtu; |
| 770 | return 0; |
| 771 | } |
| 772 | |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 773 | static const struct net_device_ops ipip_netdev_ops = { |
| 774 | .ndo_uninit = ipip_tunnel_uninit, |
| 775 | .ndo_start_xmit = ipip_tunnel_xmit, |
| 776 | .ndo_do_ioctl = ipip_tunnel_ioctl, |
| 777 | .ndo_change_mtu = ipip_tunnel_change_mtu, |
stephen hemminger | 87b6d21 | 2012-04-12 06:31:16 +0000 | [diff] [blame] | 778 | .ndo_get_stats64 = ipip_get_stats64, |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 779 | }; |
| 780 | |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 781 | static void ipip_dev_free(struct net_device *dev) |
| 782 | { |
| 783 | free_percpu(dev->tstats); |
| 784 | free_netdev(dev); |
| 785 | } |
| 786 | |
Eric Dumazet | c3b89fb | 2012-11-08 09:59:52 +0000 | [diff] [blame] | 787 | #define IPIP_FEATURES (NETIF_F_SG | \ |
| 788 | NETIF_F_FRAGLIST | \ |
| 789 | NETIF_F_HIGHDMA | \ |
| 790 | NETIF_F_HW_CSUM) |
| 791 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | static void ipip_tunnel_setup(struct net_device *dev) |
| 793 | { |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 794 | dev->netdev_ops = &ipip_netdev_ops; |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 795 | dev->destructor = ipip_dev_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
| 797 | dev->type = ARPHRD_TUNNEL; |
| 798 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 799 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | dev->flags = IFF_NOARP; |
| 801 | dev->iflink = 0; |
| 802 | dev->addr_len = 4; |
Pavel Emelyanov | 0a82640 | 2008-04-16 01:06:18 -0700 | [diff] [blame] | 803 | dev->features |= NETIF_F_NETNS_LOCAL; |
Eric Dumazet | 153f094 | 2010-09-28 00:17:17 +0000 | [diff] [blame] | 804 | dev->features |= NETIF_F_LLTX; |
Eric Dumazet | 28e7221 | 2009-05-28 10:44:30 +0000 | [diff] [blame] | 805 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
Eric Dumazet | c3b89fb | 2012-11-08 09:59:52 +0000 | [diff] [blame] | 806 | |
| 807 | dev->features |= IPIP_FEATURES; |
| 808 | dev->hw_features |= IPIP_FEATURES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | } |
| 810 | |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 811 | static int ipip_tunnel_init(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | { |
Stephen Hemminger | 23a12b1 | 2008-11-20 20:33:21 -0800 | [diff] [blame] | 813 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
| 815 | tunnel->dev = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | |
| 817 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); |
| 818 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); |
| 819 | |
Michal Schmidt | 5533995 | 2007-12-12 11:01:43 -0800 | [diff] [blame] | 820 | ipip_tunnel_bind_dev(dev); |
Eric Dumazet | 3c97af9 | 2010-09-27 00:35:50 +0000 | [diff] [blame] | 821 | |
| 822 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
| 823 | if (!dev->tstats) |
| 824 | return -ENOMEM; |
| 825 | |
| 826 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | } |
| 828 | |
Eric Dumazet | fada563 | 2010-09-27 23:56:46 +0000 | [diff] [blame] | 829 | static int __net_init ipip_fb_tunnel_init(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 831 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | struct iphdr *iph = &tunnel->parms.iph; |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 833 | struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
| 835 | tunnel->dev = dev; |
| 836 | strcpy(tunnel->parms.name, dev->name); |
| 837 | |
| 838 | iph->version = 4; |
| 839 | iph->protocol = IPPROTO_IPIP; |
| 840 | iph->ihl = 5; |
| 841 | |
Eric Dumazet | fada563 | 2010-09-27 23:56:46 +0000 | [diff] [blame] | 842 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
| 843 | if (!dev->tstats) |
| 844 | return -ENOMEM; |
| 845 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | dev_hold(dev); |
Eric Dumazet | cf778b0 | 2012-01-12 04:41:32 +0000 | [diff] [blame] | 847 | rcu_assign_pointer(ipn->tunnels_wc[0], tunnel); |
Eric Dumazet | fada563 | 2010-09-27 23:56:46 +0000 | [diff] [blame] | 848 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | } |
| 850 | |
Nicolas Dichtel | be42da0 | 2012-11-14 05:14:03 +0000 | [diff] [blame] | 851 | static void ipip_netlink_parms(struct nlattr *data[], |
| 852 | struct ip_tunnel_parm *parms) |
| 853 | { |
| 854 | memset(parms, 0, sizeof(*parms)); |
| 855 | |
| 856 | parms->iph.version = 4; |
| 857 | parms->iph.protocol = IPPROTO_IPIP; |
| 858 | parms->iph.ihl = 5; |
| 859 | |
| 860 | if (!data) |
| 861 | return; |
| 862 | |
| 863 | if (data[IFLA_IPTUN_LINK]) |
| 864 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); |
| 865 | |
| 866 | if (data[IFLA_IPTUN_LOCAL]) |
Nicolas Dichtel | fea379b | 2012-11-15 04:06:40 +0000 | [diff] [blame] | 867 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
Nicolas Dichtel | be42da0 | 2012-11-14 05:14:03 +0000 | [diff] [blame] | 868 | |
| 869 | if (data[IFLA_IPTUN_REMOTE]) |
Nicolas Dichtel | fea379b | 2012-11-15 04:06:40 +0000 | [diff] [blame] | 870 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
Nicolas Dichtel | be42da0 | 2012-11-14 05:14:03 +0000 | [diff] [blame] | 871 | |
| 872 | if (data[IFLA_IPTUN_TTL]) { |
| 873 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); |
| 874 | if (parms->iph.ttl) |
| 875 | parms->iph.frag_off = htons(IP_DF); |
| 876 | } |
| 877 | |
| 878 | if (data[IFLA_IPTUN_TOS]) |
| 879 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); |
| 880 | |
| 881 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) |
| 882 | parms->iph.frag_off = htons(IP_DF); |
| 883 | } |
| 884 | |
| 885 | static int ipip_newlink(struct net *src_net, struct net_device *dev, |
| 886 | struct nlattr *tb[], struct nlattr *data[]) |
| 887 | { |
| 888 | struct net *net = dev_net(dev); |
| 889 | struct ip_tunnel *nt; |
| 890 | |
| 891 | nt = netdev_priv(dev); |
| 892 | ipip_netlink_parms(data, &nt->parms); |
| 893 | |
| 894 | if (ipip_tunnel_locate(net, &nt->parms, 0)) |
| 895 | return -EEXIST; |
| 896 | |
| 897 | return ipip_tunnel_create(dev); |
| 898 | } |
| 899 | |
| 900 | static int ipip_changelink(struct net_device *dev, struct nlattr *tb[], |
| 901 | struct nlattr *data[]) |
| 902 | { |
| 903 | struct ip_tunnel *t; |
| 904 | struct ip_tunnel_parm p; |
| 905 | struct net *net = dev_net(dev); |
| 906 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
| 907 | |
| 908 | if (dev == ipn->fb_tunnel_dev) |
| 909 | return -EINVAL; |
| 910 | |
| 911 | ipip_netlink_parms(data, &p); |
| 912 | |
| 913 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || |
| 914 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) |
| 915 | return -EINVAL; |
| 916 | |
| 917 | t = ipip_tunnel_locate(net, &p, 0); |
| 918 | |
| 919 | if (t) { |
| 920 | if (t->dev != dev) |
| 921 | return -EEXIST; |
| 922 | } else |
| 923 | t = netdev_priv(dev); |
| 924 | |
| 925 | ipip_tunnel_update(t, &p); |
| 926 | return 0; |
| 927 | } |
| 928 | |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 929 | static size_t ipip_get_size(const struct net_device *dev) |
| 930 | { |
| 931 | return |
| 932 | /* IFLA_IPTUN_LINK */ |
| 933 | nla_total_size(4) + |
| 934 | /* IFLA_IPTUN_LOCAL */ |
| 935 | nla_total_size(4) + |
| 936 | /* IFLA_IPTUN_REMOTE */ |
| 937 | nla_total_size(4) + |
| 938 | /* IFLA_IPTUN_TTL */ |
| 939 | nla_total_size(1) + |
| 940 | /* IFLA_IPTUN_TOS */ |
| 941 | nla_total_size(1) + |
Nicolas Dichtel | befe2aa | 2012-11-14 05:14:02 +0000 | [diff] [blame] | 942 | /* IFLA_IPTUN_PMTUDISC */ |
| 943 | nla_total_size(1) + |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 944 | 0; |
| 945 | } |
| 946 | |
| 947 | static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 948 | { |
| 949 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 950 | struct ip_tunnel_parm *parm = &tunnel->parms; |
| 951 | |
| 952 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || |
| 953 | nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || |
| 954 | nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || |
| 955 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || |
Nicolas Dichtel | befe2aa | 2012-11-14 05:14:02 +0000 | [diff] [blame] | 956 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
| 957 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, |
| 958 | !!(parm->iph.frag_off & htons(IP_DF)))) |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 959 | goto nla_put_failure; |
| 960 | return 0; |
| 961 | |
| 962 | nla_put_failure: |
| 963 | return -EMSGSIZE; |
| 964 | } |
| 965 | |
Nicolas Dichtel | be42da0 | 2012-11-14 05:14:03 +0000 | [diff] [blame] | 966 | static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = { |
| 967 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, |
| 968 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, |
| 969 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, |
| 970 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, |
| 971 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, |
| 972 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, |
| 973 | }; |
| 974 | |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 975 | static struct rtnl_link_ops ipip_link_ops __read_mostly = { |
| 976 | .kind = "ipip", |
| 977 | .maxtype = IFLA_IPTUN_MAX, |
Nicolas Dichtel | be42da0 | 2012-11-14 05:14:03 +0000 | [diff] [blame] | 978 | .policy = ipip_policy, |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 979 | .priv_size = sizeof(struct ip_tunnel), |
Nicolas Dichtel | be42da0 | 2012-11-14 05:14:03 +0000 | [diff] [blame] | 980 | .setup = ipip_tunnel_setup, |
| 981 | .newlink = ipip_newlink, |
| 982 | .changelink = ipip_changelink, |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 983 | .get_size = ipip_get_size, |
| 984 | .fill_info = ipip_fill_info, |
| 985 | }; |
| 986 | |
Eric Dumazet | 6dcd814 | 2010-08-30 07:04:14 +0000 | [diff] [blame] | 987 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | .handler = ipip_rcv, |
| 989 | .err_handler = ipip_err, |
Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame] | 990 | .priority = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | }; |
| 992 | |
Stephen Hemminger | 5747a1a | 2009-02-22 00:02:08 -0800 | [diff] [blame] | 993 | static const char banner[] __initconst = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | KERN_INFO "IPv4 over IPv4 tunneling driver\n"; |
| 995 | |
Eric Dumazet | 0694c4c | 2009-10-27 07:06:59 +0000 | [diff] [blame] | 996 | 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] | 997 | { |
| 998 | int prio; |
| 999 | |
| 1000 | for (prio = 1; prio < 4; prio++) { |
| 1001 | int h; |
| 1002 | for (h = 0; h < HASH_SIZE; h++) { |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 1003 | struct ip_tunnel *t; |
Eric Dumazet | 0694c4c | 2009-10-27 07:06:59 +0000 | [diff] [blame] | 1004 | |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 1005 | t = rtnl_dereference(ipn->tunnels[prio][h]); |
Eric Dumazet | 0694c4c | 2009-10-27 07:06:59 +0000 | [diff] [blame] | 1006 | while (t != NULL) { |
| 1007 | unregister_netdevice_queue(t->dev, head); |
Eric Dumazet | b7285b7 | 2010-09-15 11:07:24 +0000 | [diff] [blame] | 1008 | t = rtnl_dereference(t->next); |
Eric Dumazet | 0694c4c | 2009-10-27 07:06:59 +0000 | [diff] [blame] | 1009 | } |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 1010 | } |
| 1011 | } |
| 1012 | } |
| 1013 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1014 | static int __net_init ipip_init_net(struct net *net) |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 1015 | { |
Eric W. Biederman | 86de8a6 | 2009-11-29 15:46:14 +0000 | [diff] [blame] | 1016 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Ted Feng | 72b3601 | 2011-12-08 00:46:21 +0000 | [diff] [blame] | 1017 | struct ip_tunnel *t; |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 1018 | int err; |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 1019 | |
Pavel Emelyanov | 44d3c29 | 2008-04-16 01:05:32 -0700 | [diff] [blame] | 1020 | ipn->tunnels[0] = ipn->tunnels_wc; |
| 1021 | ipn->tunnels[1] = ipn->tunnels_l; |
| 1022 | ipn->tunnels[2] = ipn->tunnels_r; |
| 1023 | ipn->tunnels[3] = ipn->tunnels_r_l; |
| 1024 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 1025 | ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), |
| 1026 | "tunl0", |
| 1027 | ipip_tunnel_setup); |
| 1028 | if (!ipn->fb_tunnel_dev) { |
| 1029 | err = -ENOMEM; |
| 1030 | goto err_alloc_dev; |
| 1031 | } |
Alexey Dobriyan | be77e59 | 2008-11-23 17:26:26 -0800 | [diff] [blame] | 1032 | dev_net_set(ipn->fb_tunnel_dev, net); |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 1033 | |
Eric Dumazet | fada563 | 2010-09-27 23:56:46 +0000 | [diff] [blame] | 1034 | err = ipip_fb_tunnel_init(ipn->fb_tunnel_dev); |
| 1035 | if (err) |
| 1036 | goto err_reg_dev; |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 1037 | |
| 1038 | if ((err = register_netdev(ipn->fb_tunnel_dev))) |
| 1039 | goto err_reg_dev; |
| 1040 | |
Ted Feng | 72b3601 | 2011-12-08 00:46:21 +0000 | [diff] [blame] | 1041 | t = netdev_priv(ipn->fb_tunnel_dev); |
| 1042 | |
| 1043 | strcpy(t->parms.name, ipn->fb_tunnel_dev->name); |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 1044 | return 0; |
| 1045 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 1046 | err_reg_dev: |
Eric Dumazet | fada563 | 2010-09-27 23:56:46 +0000 | [diff] [blame] | 1047 | ipip_dev_free(ipn->fb_tunnel_dev); |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 1048 | err_alloc_dev: |
| 1049 | /* nothing */ |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 1050 | return err; |
| 1051 | } |
| 1052 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1053 | static void __net_exit ipip_exit_net(struct net *net) |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 1054 | { |
Eric W. Biederman | 86de8a6 | 2009-11-29 15:46:14 +0000 | [diff] [blame] | 1055 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
Eric Dumazet | 0694c4c | 2009-10-27 07:06:59 +0000 | [diff] [blame] | 1056 | LIST_HEAD(list); |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 1057 | |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 1058 | rtnl_lock(); |
Eric Dumazet | 0694c4c | 2009-10-27 07:06:59 +0000 | [diff] [blame] | 1059 | ipip_destroy_tunnels(ipn, &list); |
| 1060 | unregister_netdevice_queue(ipn->fb_tunnel_dev, &list); |
| 1061 | unregister_netdevice_many(&list); |
Pavel Emelyanov | b9855c5 | 2008-04-16 01:04:13 -0700 | [diff] [blame] | 1062 | rtnl_unlock(); |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 1063 | } |
| 1064 | |
| 1065 | static struct pernet_operations ipip_net_ops = { |
| 1066 | .init = ipip_init_net, |
| 1067 | .exit = ipip_exit_net, |
Eric W. Biederman | 86de8a6 | 2009-11-29 15:46:14 +0000 | [diff] [blame] | 1068 | .id = &ipip_net_id, |
| 1069 | .size = sizeof(struct ipip_net), |
Pavel Emelyanov | 10dc4c7 | 2008-04-16 01:03:13 -0700 | [diff] [blame] | 1070 | }; |
| 1071 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | static int __init ipip_init(void) |
| 1073 | { |
| 1074 | int err; |
| 1075 | |
| 1076 | printk(banner); |
| 1077 | |
Eric W. Biederman | 86de8a6 | 2009-11-29 15:46:14 +0000 | [diff] [blame] | 1078 | err = register_pernet_device(&ipip_net_ops); |
Alexey Dobriyan | d5aa407 | 2010-02-16 09:05:04 +0000 | [diff] [blame] | 1079 | if (err < 0) |
| 1080 | return err; |
| 1081 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); |
| 1082 | if (err < 0) { |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1083 | pr_info("%s: can't register tunnel\n", __func__); |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 1084 | goto xfrm_tunnel_failed; |
Alexey Dobriyan | d5aa407 | 2010-02-16 09:05:04 +0000 | [diff] [blame] | 1085 | } |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 1086 | err = rtnl_link_register(&ipip_link_ops); |
| 1087 | if (err < 0) |
| 1088 | goto rtnl_link_failed; |
| 1089 | |
| 1090 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | return err; |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 1092 | |
| 1093 | rtnl_link_failed: |
| 1094 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
| 1095 | xfrm_tunnel_failed: |
| 1096 | unregister_pernet_device(&ipip_net_ops); |
| 1097 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | } |
| 1099 | |
| 1100 | static void __exit ipip_fini(void) |
| 1101 | { |
Nicolas Dichtel | 0974658 | 2012-11-09 06:09:59 +0000 | [diff] [blame] | 1102 | rtnl_link_unregister(&ipip_link_ops); |
Kazunori MIYAZAWA | c0d5640 | 2007-02-13 12:54:47 -0800 | [diff] [blame] | 1103 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1104 | pr_info("%s: can't deregister tunnel\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | |
Eric W. Biederman | 86de8a6 | 2009-11-29 15:46:14 +0000 | [diff] [blame] | 1106 | unregister_pernet_device(&ipip_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | } |
| 1108 | |
| 1109 | module_init(ipip_init); |
| 1110 | module_exit(ipip_fini); |
| 1111 | MODULE_LICENSE("GPL"); |
Vasiliy Kulikov | 8909c9a | 2011-03-02 00:33:13 +0300 | [diff] [blame] | 1112 | MODULE_ALIAS_NETDEV("tunl0"); |