blob: 62eaa005e14610237f9e8a6016c366ba6d6b09cf [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002 * Linux NET3: IP/IP protocol decoder.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * 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 Hideakie905a9e2007-02-09 23:24:47 +090036
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 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 Hideakie905a9e2007-02-09 23:24:47 +090043
Alan Cox113aa832008-10-13 19:01:08 -070044 -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
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 Hideakie905a9e2007-02-09 23:24:47 +090053
Linus Torvalds1da177e2005-04-16 15:20:36 -070054*/
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 Hideakie905a9e2007-02-09 23:24:47 +090076 find out how much more space you can allocate by calling
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 "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 Hideakie905a9e2007-02-09 23:24:47 +090093
Randy Dunlap4fc268d2006-01-11 12:17:47 -080094#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#include <linux/module.h>
96#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070097#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090098#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#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 Katterjohn46f25df2006-01-05 16:35:42 -0800109#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111#include <net/sock.h>
112#include <net/ip.h>
113#include <net/icmp.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +0000114#include <net/ip_tunnels.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#include <net/inet_ecn.h>
116#include <net/xfrm.h>
Pavel Emelyanov10dc4c72008-04-16 01:03:13 -0700117#include <net/net_namespace.h>
118#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
stephen hemmingereccc1bb2012-09-25 11:02:48 +0000120static bool log_ecn_error = true;
121module_param(log_ecn_error, bool, 0644);
122MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
123
Eric Dumazetf99189b2009-11-17 10:42:49 +0000124static int ipip_net_id __read_mostly;
Pavel Emelyanov10dc4c72008-04-16 01:03:13 -0700125
Eric Dumazet3c97af92010-09-27 00:35:50 +0000126static int ipip_tunnel_init(struct net_device *dev);
Nicolas Dichtel09746582012-11-09 06:09:59 +0000127static struct rtnl_link_ops ipip_link_ops __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Herbert Xud2acc342006-03-28 01:12:13 -0800129static int ipip_err(struct sk_buff *skb, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Rami Rosen071f92d2008-05-21 17:47:54 -0700132/* All the routers (except for Linux) return only
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 8 bytes of packet payload. It means, that precise relaying of
134 ICMP in the real Internet is absolutely infeasible.
135 */
Pravin B Shelarfd581562013-03-25 14:49:41 +0000136 struct net *net = dev_net(skb->dev);
137 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000138 const struct iphdr *iph = (const struct iphdr *)skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 struct ip_tunnel *t;
Herbert Xud2acc342006-03-28 01:12:13 -0800140 int err;
Pravin B Shelarfd581562013-03-25 14:49:41 +0000141 const int type = icmp_hdr(skb)->type;
142 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Herbert Xud2acc342006-03-28 01:12:13 -0800144 err = -ENOENT;
Pravin B Shelarfd581562013-03-25 14:49:41 +0000145 t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
146 iph->daddr, iph->saddr, 0);
David S. Miller36393392012-06-14 22:21:46 -0700147 if (t == NULL)
148 goto out;
149
150 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
151 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
Dmitry Popov23468292014-06-06 23:19:21 +0400152 t->parms.link, 0, IPPROTO_IPIP, 0);
David S. Miller36393392012-06-14 22:21:46 -0700153 err = 0;
154 goto out;
155 }
156
David S. Miller55be7a92012-07-11 21:27:49 -0700157 if (type == ICMP_REDIRECT) {
Dmitry Popov23468292014-06-06 23:19:21 +0400158 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
David S. Miller55be7a92012-07-11 21:27:49 -0700159 IPPROTO_IPIP, 0);
160 err = 0;
161 goto out;
162 }
163
David S. Miller36393392012-06-14 22:21:46 -0700164 if (t->parms.iph.daddr == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 goto out;
Herbert Xud2acc342006-03-28 01:12:13 -0800166
167 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
169 goto out;
170
Wei Yongjun26d94b42009-02-24 23:36:47 -0800171 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 t->err_count++;
173 else
174 t->err_count = 1;
175 t->err_time = jiffies;
stephen hemmingerb0558ef2012-09-24 18:12:25 +0000176
Pravin B Shelarfd581562013-03-25 14:49:41 +0000177out:
Herbert Xud2acc342006-03-28 01:12:13 -0800178 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
180
Pravin B Shelarfd581562013-03-25 14:49:41 +0000181static const struct tnl_ptk_info tpi = {
182 /* no tunnel info required for ipip. */
183 .proto = htons(ETH_P_IP),
184};
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186static int ipip_rcv(struct sk_buff *skb)
187{
Pravin B Shelarfd581562013-03-25 14:49:41 +0000188 struct net *net = dev_net(skb->dev);
189 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 struct ip_tunnel *tunnel;
Pravin B Shelar3d7b46c2013-06-17 17:50:02 -0700191 const struct iphdr *iph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Pravin B Shelar3d7b46c2013-06-17 17:50:02 -0700193 iph = ip_hdr(skb);
Pravin B Shelarfd581562013-03-25 14:49:41 +0000194 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
195 iph->saddr, iph->daddr, 0);
196 if (tunnel) {
stephen hemmingereccc1bb2012-09-25 11:02:48 +0000197 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
198 goto drop;
Li Hongjun737e8282013-08-28 11:54:50 +0200199 if (iptunnel_pull_header(skb, 0, tpi.proto))
200 goto drop;
Pravin B Shelarfd581562013-03-25 14:49:41 +0000201 return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 return -1;
stephen hemmingereccc1bb2012-09-25 11:02:48 +0000205
206drop:
207 kfree_skb(skb);
208 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209}
210
211/*
212 * This function assumes it is being called from dev_queue_xmit()
213 * and that skb is filled properly by that function.
214 */
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000215static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216{
Patrick McHardy2941a482006-01-08 22:05:26 -0800217 struct ip_tunnel *tunnel = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000218 const struct iphdr *tiph = &tunnel->parms.iph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Pravin B Shelarfd581562013-03-25 14:49:41 +0000220 if (unlikely(skb->protocol != htons(ETH_P_IP)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 goto tx_error;
Eric Dumazetcef401d2013-01-25 20:34:37 +0000222
Eric Dumazetcb32f512013-10-19 11:42:57 -0700223 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP);
224 if (IS_ERR(skb))
225 goto out;
Pravin B Shelar4f3ed922013-03-08 15:12:52 +0000226
Nicolas Dichtelbf3d6a82013-05-27 23:48:15 +0000227 ip_tunnel_xmit(skb, dev, tiph, tiph->protocol);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000228 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230tx_error:
Eric Dumazet3acfa1e2014-01-18 18:27:49 -0800231 kfree_skb(skb);
Eric Dumazetcb32f512013-10-19 11:42:57 -0700232out:
233 dev->stats.tx_errors++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000234 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
237static int
Pravin B Shelarfd581562013-03-25 14:49:41 +0000238ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239{
240 int err = 0;
241 struct ip_tunnel_parm p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
Pravin B Shelarfd581562013-03-25 14:49:41 +0000243 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
244 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Cong Wang3b7b5142013-07-02 14:49:34 +0800246 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
247 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
248 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
249 return -EINVAL;
250 }
251
252 p.i_key = p.o_key = p.i_flags = p.o_flags = 0;
Pravin B Shelarfd581562013-03-25 14:49:41 +0000253 if (p.iph.ttl)
254 p.iph.frag_off |= htons(IP_DF);
255
256 err = ip_tunnel_ioctl(dev, &p, cmd);
257 if (err)
258 return err;
259
260 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
261 return -EFAULT;
262
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 return 0;
264}
265
Stephen Hemminger23a12b12008-11-20 20:33:21 -0800266static const struct net_device_ops ipip_netdev_ops = {
Pravin B Shelarfd581562013-03-25 14:49:41 +0000267 .ndo_init = ipip_tunnel_init,
268 .ndo_uninit = ip_tunnel_uninit,
Stephen Hemminger23a12b12008-11-20 20:33:21 -0800269 .ndo_start_xmit = ipip_tunnel_xmit,
270 .ndo_do_ioctl = ipip_tunnel_ioctl,
Pravin B Shelarfd581562013-03-25 14:49:41 +0000271 .ndo_change_mtu = ip_tunnel_change_mtu,
272 .ndo_get_stats64 = ip_tunnel_get_stats64,
Stephen Hemminger23a12b12008-11-20 20:33:21 -0800273};
274
Eric Dumazetc3b89fb2012-11-08 09:59:52 +0000275#define IPIP_FEATURES (NETIF_F_SG | \
276 NETIF_F_FRAGLIST | \
277 NETIF_F_HIGHDMA | \
Eric Dumazetcb32f512013-10-19 11:42:57 -0700278 NETIF_F_GSO_SOFTWARE | \
Eric Dumazetc3b89fb2012-11-08 09:59:52 +0000279 NETIF_F_HW_CSUM)
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281static void ipip_tunnel_setup(struct net_device *dev)
282{
Stephen Hemminger23a12b12008-11-20 20:33:21 -0800283 dev->netdev_ops = &ipip_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285 dev->type = ARPHRD_TUNNEL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 dev->flags = IFF_NOARP;
287 dev->iflink = 0;
288 dev->addr_len = 4;
Eric Dumazet153f0942010-09-28 00:17:17 +0000289 dev->features |= NETIF_F_LLTX;
Eric Dumazet28e72212009-05-28 10:44:30 +0000290 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Eric Dumazetc3b89fb2012-11-08 09:59:52 +0000291
292 dev->features |= IPIP_FEATURES;
293 dev->hw_features |= IPIP_FEATURES;
Pravin B Shelarfd581562013-03-25 14:49:41 +0000294 ip_tunnel_setup(dev, ipip_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
296
Eric Dumazet3c97af92010-09-27 00:35:50 +0000297static int ipip_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298{
Stephen Hemminger23a12b12008-11-20 20:33:21 -0800299 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
302 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
303
Pravin B Shelarfd581562013-03-25 14:49:41 +0000304 tunnel->hlen = 0;
305 tunnel->parms.iph.protocol = IPPROTO_IPIP;
306 return ip_tunnel_init(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000309static void ipip_netlink_parms(struct nlattr *data[],
310 struct ip_tunnel_parm *parms)
311{
312 memset(parms, 0, sizeof(*parms));
313
314 parms->iph.version = 4;
315 parms->iph.protocol = IPPROTO_IPIP;
316 parms->iph.ihl = 5;
317
318 if (!data)
319 return;
320
321 if (data[IFLA_IPTUN_LINK])
322 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
323
324 if (data[IFLA_IPTUN_LOCAL])
Nicolas Dichtelfea379b2012-11-15 04:06:40 +0000325 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000326
327 if (data[IFLA_IPTUN_REMOTE])
Nicolas Dichtelfea379b2012-11-15 04:06:40 +0000328 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000329
330 if (data[IFLA_IPTUN_TTL]) {
331 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
332 if (parms->iph.ttl)
333 parms->iph.frag_off = htons(IP_DF);
334 }
335
336 if (data[IFLA_IPTUN_TOS])
337 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
338
339 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
340 parms->iph.frag_off = htons(IP_DF);
341}
342
343static int ipip_newlink(struct net *src_net, struct net_device *dev,
344 struct nlattr *tb[], struct nlattr *data[])
345{
Pravin B Shelarfd581562013-03-25 14:49:41 +0000346 struct ip_tunnel_parm p;
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000347
Pravin B Shelarfd581562013-03-25 14:49:41 +0000348 ipip_netlink_parms(data, &p);
349 return ip_tunnel_newlink(dev, tb, &p);
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000350}
351
352static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
353 struct nlattr *data[])
354{
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000355 struct ip_tunnel_parm p;
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000356
357 ipip_netlink_parms(data, &p);
358
359 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
360 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
361 return -EINVAL;
362
Pravin B Shelarfd581562013-03-25 14:49:41 +0000363 return ip_tunnel_changelink(dev, tb, &p);
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000364}
365
Nicolas Dichtel09746582012-11-09 06:09:59 +0000366static size_t ipip_get_size(const struct net_device *dev)
367{
368 return
369 /* IFLA_IPTUN_LINK */
370 nla_total_size(4) +
371 /* IFLA_IPTUN_LOCAL */
372 nla_total_size(4) +
373 /* IFLA_IPTUN_REMOTE */
374 nla_total_size(4) +
375 /* IFLA_IPTUN_TTL */
376 nla_total_size(1) +
377 /* IFLA_IPTUN_TOS */
378 nla_total_size(1) +
Nicolas Dichtelbefe2aa2012-11-14 05:14:02 +0000379 /* IFLA_IPTUN_PMTUDISC */
380 nla_total_size(1) +
Nicolas Dichtel09746582012-11-09 06:09:59 +0000381 0;
382}
383
384static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
385{
386 struct ip_tunnel *tunnel = netdev_priv(dev);
387 struct ip_tunnel_parm *parm = &tunnel->parms;
388
389 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
390 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
391 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
392 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
Nicolas Dichtelbefe2aa2012-11-14 05:14:02 +0000393 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
394 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
395 !!(parm->iph.frag_off & htons(IP_DF))))
Nicolas Dichtel09746582012-11-09 06:09:59 +0000396 goto nla_put_failure;
397 return 0;
398
399nla_put_failure:
400 return -EMSGSIZE;
401}
402
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000403static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
404 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
405 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
406 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
407 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
408 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
409 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
410};
411
Nicolas Dichtel09746582012-11-09 06:09:59 +0000412static struct rtnl_link_ops ipip_link_ops __read_mostly = {
413 .kind = "ipip",
414 .maxtype = IFLA_IPTUN_MAX,
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000415 .policy = ipip_policy,
Nicolas Dichtel09746582012-11-09 06:09:59 +0000416 .priv_size = sizeof(struct ip_tunnel),
Nicolas Dichtelbe42da02012-11-14 05:14:03 +0000417 .setup = ipip_tunnel_setup,
418 .newlink = ipip_newlink,
419 .changelink = ipip_changelink,
Pravin B Shelarfd581562013-03-25 14:49:41 +0000420 .dellink = ip_tunnel_dellink,
Nicolas Dichtel09746582012-11-09 06:09:59 +0000421 .get_size = ipip_get_size,
422 .fill_info = ipip_fill_info,
423};
424
Eric Dumazet6dcd8142010-08-30 07:04:14 +0000425static struct xfrm_tunnel ipip_handler __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 .handler = ipip_rcv,
427 .err_handler = ipip_err,
Herbert Xud2acc342006-03-28 01:12:13 -0800428 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429};
430
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000431static int __net_init ipip_init_net(struct net *net)
Pavel Emelyanov10dc4c72008-04-16 01:03:13 -0700432{
Pravin B Shelarfd581562013-03-25 14:49:41 +0000433 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
Pavel Emelyanov10dc4c72008-04-16 01:03:13 -0700434}
435
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000436static void __net_exit ipip_exit_net(struct net *net)
Pavel Emelyanov10dc4c72008-04-16 01:03:13 -0700437{
Pravin B Shelarfd581562013-03-25 14:49:41 +0000438 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
Nicolas Dichtel6c742e72013-08-13 17:51:11 +0200439 ip_tunnel_delete_net(itn, &ipip_link_ops);
Pavel Emelyanov10dc4c72008-04-16 01:03:13 -0700440}
441
442static struct pernet_operations ipip_net_ops = {
443 .init = ipip_init_net,
444 .exit = ipip_exit_net,
Eric W. Biederman86de8a62009-11-29 15:46:14 +0000445 .id = &ipip_net_id,
Pravin B Shelarfd581562013-03-25 14:49:41 +0000446 .size = sizeof(struct ip_tunnel_net),
Pavel Emelyanov10dc4c72008-04-16 01:03:13 -0700447};
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449static int __init ipip_init(void)
450{
451 int err;
452
Pravin B Shelarfd581562013-03-25 14:49:41 +0000453 pr_info("ipip: IPv4 over IPv4 tunneling driver\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Eric W. Biederman86de8a62009-11-29 15:46:14 +0000455 err = register_pernet_device(&ipip_net_ops);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +0000456 if (err < 0)
457 return err;
458 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
459 if (err < 0) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000460 pr_info("%s: can't register tunnel\n", __func__);
Nicolas Dichtel09746582012-11-09 06:09:59 +0000461 goto xfrm_tunnel_failed;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +0000462 }
Nicolas Dichtel09746582012-11-09 06:09:59 +0000463 err = rtnl_link_register(&ipip_link_ops);
464 if (err < 0)
465 goto rtnl_link_failed;
466
467out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 return err;
Nicolas Dichtel09746582012-11-09 06:09:59 +0000469
470rtnl_link_failed:
471 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
472xfrm_tunnel_failed:
473 unregister_pernet_device(&ipip_net_ops);
474 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475}
476
477static void __exit ipip_fini(void)
478{
Nicolas Dichtel09746582012-11-09 06:09:59 +0000479 rtnl_link_unregister(&ipip_link_ops);
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -0800480 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
Joe Perches058bd4d2012-03-11 18:36:11 +0000481 pr_info("%s: can't deregister tunnel\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
Eric W. Biederman86de8a62009-11-29 15:46:14 +0000483 unregister_pernet_device(&ipip_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484}
485
486module_init(ipip_init);
487module_exit(ipip_fini);
488MODULE_LICENSE("GPL");
Tom Gundersenf98f89a2014-05-15 23:21:30 +0200489MODULE_ALIAS_RTNL_LINK("ipip");
Vasiliy Kulikov8909c9a2011-03-02 00:33:13 +0300490MODULE_ALIAS_NETDEV("tunl0");