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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09002 * IPv6 tunneling device
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Linux INET6 implementation
4 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Ville Nuorvala <vnuorval@tcs.hut.fi>
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09007 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Based on:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090010 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 * RFC 2473
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/module.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080022#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/sockios.h>
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090026#include <linux/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/if.h>
28#include <linux/in.h>
29#include <linux/ip.h>
30#include <linux/if_tunnel.h>
31#include <linux/net.h>
32#include <linux/in6.h>
33#include <linux/netdevice.h>
34#include <linux/if_arp.h>
35#include <linux/icmpv6.h>
36#include <linux/init.h>
37#include <linux/route.h>
38#include <linux/rtnetlink.h>
39#include <linux/netfilter_ipv6.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42#include <asm/uaccess.h>
43#include <asm/atomic.h>
44
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090045#include <net/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <net/ip.h>
47#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <net/ip6_route.h>
49#include <net/addrconf.h>
50#include <net/ip6_tunnel.h>
51#include <net/xfrm.h>
52#include <net/dsfield.h>
53#include <net/inet_ecn.h>
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070054#include <net/net_namespace.h>
55#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57MODULE_AUTHOR("Ville Nuorvala");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090058MODULE_DESCRIPTION("IPv6 tunneling device");
Linus Torvalds1da177e2005-04-16 15:20:36 -070059MODULE_LICENSE("GPL");
60
61#define IPV6_TLV_TEL_DST_SIZE 8
62
63#ifdef IP6_TNL_DEBUG
Harvey Harrison0dc47872008-03-05 20:47:47 -080064#define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#else
66#define IP6_TNL_TRACE(x...) do {;} while(0)
67#endif
68
69#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090070#define IPV6_TCLASS_SHIFT 20
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72#define HASH_SIZE 32
73
Al Viroe69a4adc2006-11-14 20:56:00 -080074#define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090075 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
76 (HASH_SIZE - 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Stephen Hemminger1326c3d2008-11-20 20:33:56 -080078static void ip6_tnl_dev_init(struct net_device *dev);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +090079static void ip6_tnl_dev_setup(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Eric Dumazetf99189b2009-11-17 10:42:49 +000081static int ip6_tnl_net_id __read_mostly;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070082struct ip6_tnl_net {
Pavel Emelyanov15820e1292008-04-16 01:23:02 -070083 /* the IPv6 tunnel fallback device */
84 struct net_device *fb_tnl_dev;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -070085 /* lists for storing tunnels in use */
86 struct ip6_tnl *tnls_r_l[HASH_SIZE];
87 struct ip6_tnl *tnls_wc[1];
88 struct ip6_tnl **tnls[2];
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070089};
90
Eric Dumazet2922bc82009-10-23 06:34:34 +000091/*
92 * Locking : hash tables are protected by RCU and a spinlock
93 */
94static DEFINE_SPINLOCK(ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
97{
98 struct dst_entry *dst = t->dst_cache;
99
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900100 if (dst && dst->obsolete &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 dst->ops->check(dst, t->dst_cookie) == NULL) {
102 t->dst_cache = NULL;
103 dst_release(dst);
104 return NULL;
105 }
106
107 return dst;
108}
109
110static inline void ip6_tnl_dst_reset(struct ip6_tnl *t)
111{
112 dst_release(t->dst_cache);
113 t->dst_cache = NULL;
114}
115
116static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
117{
118 struct rt6_info *rt = (struct rt6_info *) dst;
119 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
120 dst_release(t->dst_cache);
121 t->dst_cache = dst;
122}
123
124/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900125 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900126 * @remote: the address of the tunnel exit-point
127 * @local: the address of the tunnel entry-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900129 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 * tunnel matching given end-points if found,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900131 * else fallback tunnel if its device is up,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 * else %NULL
133 **/
134
Eric Dumazet2922bc82009-10-23 06:34:34 +0000135#define for_each_ip6_tunnel_rcu(start) \
136 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138static struct ip6_tnl *
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700139ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140{
141 unsigned h0 = HASH(remote);
142 unsigned h1 = HASH(local);
143 struct ip6_tnl *t;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700144 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Eric Dumazet2922bc82009-10-23 06:34:34 +0000146 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 if (ipv6_addr_equal(local, &t->parms.laddr) &&
148 ipv6_addr_equal(remote, &t->parms.raddr) &&
149 (t->dev->flags & IFF_UP))
150 return t;
151 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000152 t = rcu_dereference(ip6n->tnls_wc[0]);
153 if (t && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 return t;
155
156 return NULL;
157}
158
159/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900160 * ip6_tnl_bucket - get head of list matching given tunnel parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900161 * @p: parameters containing tunnel end-points
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 *
163 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900164 * ip6_tnl_bucket() returns the head of the list matching the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 * &struct in6_addr entries laddr and raddr in @p.
166 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900167 * Return: head of IPv6 tunnel list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 **/
169
170static struct ip6_tnl **
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700171ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
173 struct in6_addr *remote = &p->raddr;
174 struct in6_addr *local = &p->laddr;
175 unsigned h = 0;
176 int prio = 0;
177
178 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
179 prio = 1;
180 h = HASH(remote) ^ HASH(local);
181 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700182 return &ip6n->tnls[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
185/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900186 * ip6_tnl_link - add tunnel to hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 * @t: tunnel to be added
188 **/
189
190static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700191ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700193 struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Eric Dumazet2922bc82009-10-23 06:34:34 +0000195 spin_lock_bh(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 t->next = *tp;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000197 rcu_assign_pointer(*tp, t);
198 spin_unlock_bh(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199}
200
201/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900202 * ip6_tnl_unlink - remove tunnel from hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 * @t: tunnel to be removed
204 **/
205
206static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700207ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
209 struct ip6_tnl **tp;
210
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700211 for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 if (t == *tp) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000213 spin_lock_bh(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 *tp = t->next;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000215 spin_unlock_bh(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 break;
217 }
218 }
219}
220
221/**
222 * ip6_tnl_create() - create a new tunnel
223 * @p: tunnel parameters
224 * @pt: pointer to new tunnel
225 *
226 * Description:
227 * Create tunnel matching given parameters.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900228 *
229 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800230 * created tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 **/
232
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700233static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234{
235 struct net_device *dev;
236 struct ip6_tnl *t;
237 char name[IFNAMSIZ];
238 int err;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700239 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800241 if (p->name[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 strlcpy(name, p->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800243 else
244 sprintf(name, "ip6tnl%%d");
245
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900246 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 if (dev == NULL)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800248 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Pavel Emelyanov554eb272008-04-16 01:24:13 -0700250 dev_net_set(dev, net);
251
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800252 if (strchr(name, '%')) {
253 if (dev_alloc_name(dev, name) < 0)
254 goto failed_free;
255 }
256
Patrick McHardy2941a482006-01-08 22:05:26 -0800257 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 t->parms = *p;
Noriaki TAKAMIYA20461c12009-02-09 15:01:19 -0800259 ip6_tnl_dev_init(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800261 if ((err = register_netdevice(dev)) < 0)
262 goto failed_free;
263
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 dev_hold(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700265 ip6_tnl_link(ip6n, t);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800266 return t;
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800267
268failed_free:
269 free_netdev(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800270failed:
271 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272}
273
274/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900275 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900276 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 * @create: != 0 if allowed to create new tunnel if no match found
278 *
279 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900280 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 * based on @parms. If this is unsuccessful, but @create is set a new
282 * tunnel device is created and registered for use.
283 *
284 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800285 * matching tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 **/
287
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700288static struct ip6_tnl *ip6_tnl_locate(struct net *net,
289 struct ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
291 struct in6_addr *remote = &p->raddr;
292 struct in6_addr *local = &p->laddr;
293 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700294 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700296 for (t = *ip6_tnl_bucket(ip6n, p); t; t = t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Ville Nuorvala567131a2006-11-24 17:05:41 -0800298 ipv6_addr_equal(remote, &t->parms.raddr))
299 return t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 }
301 if (!create)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800302 return NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700303 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304}
305
306/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900307 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900309 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900311 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 **/
313
314static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900315ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
Patrick McHardy2941a482006-01-08 22:05:26 -0800317 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700318 struct net *net = dev_net(dev);
319 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Pavel Emelyanov15820e1292008-04-16 01:23:02 -0700321 if (dev == ip6n->fb_tnl_dev) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000322 spin_lock_bh(&ip6_tnl_lock);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700323 ip6n->tnls_wc[0] = NULL;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000324 spin_unlock_bh(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 } else {
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700326 ip6_tnl_unlink(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 }
328 ip6_tnl_dst_reset(t);
329 dev_put(dev);
330}
331
332/**
333 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
334 * @skb: received socket buffer
335 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900336 * Return:
337 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 * else index to encapsulation limit
339 **/
340
341static __u16
342parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
343{
344 struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw;
345 __u8 nexthdr = ipv6h->nexthdr;
346 __u16 off = sizeof (*ipv6h);
347
348 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
349 __u16 optlen = 0;
350 struct ipv6_opt_hdr *hdr;
351 if (raw + off + sizeof (*hdr) > skb->data &&
352 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
353 break;
354
355 hdr = (struct ipv6_opt_hdr *) (raw + off);
356 if (nexthdr == NEXTHDR_FRAGMENT) {
357 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
358 if (frag_hdr->frag_off)
359 break;
360 optlen = 8;
361 } else if (nexthdr == NEXTHDR_AUTH) {
362 optlen = (hdr->hdrlen + 2) << 2;
363 } else {
364 optlen = ipv6_optlen(hdr);
365 }
366 if (nexthdr == NEXTHDR_DEST) {
367 __u16 i = off + 2;
368 while (1) {
369 struct ipv6_tlv_tnl_enc_lim *tel;
370
371 /* No more room for encapsulation limit */
372 if (i + sizeof (*tel) > off + optlen)
373 break;
374
375 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
376 /* return index of option if found and valid */
377 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
378 tel->length == 1)
379 return i;
380 /* else jump to next option */
381 if (tel->type)
382 i += tel->length + 2;
383 else
384 i++;
385 }
386 }
387 nexthdr = hdr->nexthdr;
388 off += optlen;
389 }
390 return 0;
391}
392
393/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900394 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 *
396 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900397 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 * to the specifications in RFC 2473.
399 **/
400
Herbert Xud2acc342006-03-28 01:12:13 -0800401static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900402ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700403 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404{
405 struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data;
406 struct ip6_tnl *t;
407 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700408 u8 rel_type = ICMPV6_DEST_UNREACH;
409 u8 rel_code = ICMPV6_ADDR_UNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 __u32 rel_info = 0;
411 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800412 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900414 /* If the packet doesn't contain the original IPv6 header we are
415 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 processing of the error. */
417
Eric Dumazet2922bc82009-10-23 06:34:34 +0000418 rcu_read_lock();
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700419 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700420 &ipv6h->saddr)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 goto out;
422
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900423 if (t->parms.proto != ipproto && t->parms.proto != 0)
424 goto out;
425
Herbert Xud2acc342006-03-28 01:12:13 -0800426 err = 0;
427
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900428 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 __u32 teli;
430 struct ipv6_tlv_tnl_enc_lim *tel;
431 __u32 mtu;
432 case ICMPV6_DEST_UNREACH:
433 if (net_ratelimit())
434 printk(KERN_WARNING
435 "%s: Path to destination invalid "
436 "or inactive!\n", t->parms.name);
437 rel_msg = 1;
438 break;
439 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900440 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 if (net_ratelimit())
442 printk(KERN_WARNING
443 "%s: Too small hop limit or "
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900444 "routing loop in tunnel!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 t->parms.name);
446 rel_msg = 1;
447 }
448 break;
449 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800450 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900451 if ((*code) == ICMPV6_HDR_FIELD)
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800452 teli = parse_tlv_tnl_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
Al Viro704eae12007-07-26 17:33:29 +0100454 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
456 if (tel->encap_limit == 0) {
457 if (net_ratelimit())
458 printk(KERN_WARNING
459 "%s: Too small encapsulation "
460 "limit or routing loop in "
461 "tunnel!\n", t->parms.name);
462 rel_msg = 1;
463 }
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800464 } else if (net_ratelimit()) {
465 printk(KERN_WARNING
466 "%s: Recipient unable to parse tunneled "
467 "packet!\n ", t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 }
469 break;
470 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100471 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 if (mtu < IPV6_MIN_MTU)
473 mtu = IPV6_MIN_MTU;
474 t->dev->mtu = mtu;
475
Al Virocc6cdac2006-02-18 16:02:18 -0500476 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 rel_type = ICMPV6_PKT_TOOBIG;
478 rel_code = 0;
479 rel_info = mtu;
480 rel_msg = 1;
481 }
482 break;
483 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900484
485 *type = rel_type;
486 *code = rel_code;
487 *info = rel_info;
488 *msg = rel_msg;
489
490out:
Eric Dumazet2922bc82009-10-23 06:34:34 +0000491 rcu_read_unlock();
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900492 return err;
493}
494
495static int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900496ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700497 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900498{
499 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700500 u8 rel_type = type;
501 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100502 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900503 int err;
504 struct sk_buff *skb2;
505 struct iphdr *eiph;
506 struct flowi fl;
507 struct rtable *rt;
508
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900509 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
510 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900511 if (err < 0)
512 return err;
513
514 if (rel_msg == 0)
515 return 0;
516
517 switch (rel_type) {
518 case ICMPV6_DEST_UNREACH:
519 if (rel_code != ICMPV6_ADDR_UNREACH)
520 return 0;
521 rel_type = ICMP_DEST_UNREACH;
522 rel_code = ICMP_HOST_UNREACH;
523 break;
524 case ICMPV6_PKT_TOOBIG:
525 if (rel_code != 0)
526 return 0;
527 rel_type = ICMP_DEST_UNREACH;
528 rel_code = ICMP_FRAG_NEEDED;
529 break;
530 default:
531 return 0;
532 }
533
534 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
535 return 0;
536
537 skb2 = skb_clone(skb, GFP_ATOMIC);
538 if (!skb2)
539 return 0;
540
Eric Dumazetadf30902009-06-02 05:19:30 +0000541 skb_dst_drop(skb2);
542
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900543 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700544 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700545 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900546
547 /* Try to guess incoming interface */
548 memset(&fl, 0, sizeof(fl));
549 fl.fl4_dst = eiph->saddr;
550 fl.fl4_tos = RT_TOS(eiph->tos);
551 fl.proto = IPPROTO_IPIP;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700552 if (ip_route_output_key(dev_net(skb->dev), &rt, &fl))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900553 goto out;
554
555 skb2->dev = rt->u.dst.dev;
556
557 /* route "incoming" packet */
558 if (rt->rt_flags & RTCF_LOCAL) {
559 ip_rt_put(rt);
560 rt = NULL;
561 fl.fl4_dst = eiph->daddr;
562 fl.fl4_src = eiph->saddr;
563 fl.fl4_tos = eiph->tos;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700564 if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) ||
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900565 rt->u.dst.dev->type != ARPHRD_TUNNEL) {
566 ip_rt_put(rt);
567 goto out;
568 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000569 skb_dst_set(skb2, (struct dst_entry *)rt);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900570 } else {
571 ip_rt_put(rt);
572 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
573 skb2->dev) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000574 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900575 goto out;
576 }
577
578 /* change mtu on this route */
579 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000580 if (rel_info > dst_mtu(skb_dst(skb2)))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900581 goto out;
582
Eric Dumazetadf30902009-06-02 05:19:30 +0000583 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900584 }
585
Al Viro704eae12007-07-26 17:33:29 +0100586 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900587
588out:
589 kfree_skb(skb2);
590 return 0;
591}
592
593static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900594ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700595 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900596{
597 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700598 u8 rel_type = type;
599 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100600 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900601 int err;
602
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900603 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
604 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900605 if (err < 0)
606 return err;
607
608 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 struct rt6_info *rt;
610 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800611
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900613 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Eric Dumazetadf30902009-06-02 05:19:30 +0000615 skb_dst_drop(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700617 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
619 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700620 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
621 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
623 if (rt && rt->rt6i_dev)
624 skb2->dev = rt->rt6i_dev;
625
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000626 icmpv6_send(skb2, rel_type, rel_code, rel_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
628 if (rt)
629 dst_release(&rt->u.dst);
630
631 kfree_skb(skb2);
632 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900633
634 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635}
636
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900637static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
638 struct ipv6hdr *ipv6h,
639 struct sk_buff *skb)
640{
641 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
642
643 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700644 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900645
646 if (INET_ECN_is_ce(dsfield))
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700647 IP_ECN_set_ce(ip_hdr(skb));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900648}
649
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900650static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
651 struct ipv6hdr *ipv6h,
652 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900654 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b42007-11-13 21:40:13 -0800655 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900657 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700658 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900660
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100661/* called with rcu_read_lock() */
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800662static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
663{
664 struct ip6_tnl_parm *p = &t->parms;
665 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700666 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800667
668 if (p->flags & IP6_TNL_F_CAP_RCV) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900669 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800670
671 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100672 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800673
674 if ((ipv6_addr_is_multicast(&p->laddr) ||
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700675 likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
676 likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800677 ret = 1;
678
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800679 }
680 return ret;
681}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
683/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900684 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 * @skb: received socket buffer
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900686 * @protocol: ethernet protocol ID
687 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 *
689 * Return: 0
690 **/
691
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900692static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900693 __u8 ipproto,
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900694 void (*dscp_ecn_decapsulate)(struct ip6_tnl *t,
695 struct ipv6hdr *ipv6h,
696 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 struct ip6_tnl *t;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700699 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
Eric Dumazet2922bc82009-10-23 06:34:34 +0000701 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700703 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700704 &ipv6h->daddr)) != NULL) {
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900705 if (t->parms.proto != ipproto && t->parms.proto != 0) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000706 rcu_read_unlock();
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900707 goto discard;
708 }
709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000711 rcu_read_unlock();
Herbert Xu50fba2a2006-04-04 13:50:45 -0700712 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 }
714
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800715 if (!ip6_tnl_rcv_ctl(t)) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700716 t->dev->stats.rx_dropped++;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000717 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 goto discard;
719 }
720 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700721 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700722 skb_reset_network_header(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900723 skb->protocol = htons(protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 skb->pkt_type = PACKET_HOST;
725 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
726 skb->dev = t->dev;
Eric Dumazetadf30902009-06-02 05:19:30 +0000727 skb_dst_drop(skb);
Yasuyuki Kozakai53ab61c2006-11-06 10:06:23 -0800728 nf_reset(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900729
730 dscp_ecn_decapsulate(t, ipv6h, skb);
731
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700732 t->dev->stats.rx_packets++;
733 t->dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 netif_rx(skb);
Eric Dumazet2922bc82009-10-23 06:34:34 +0000735 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 return 0;
737 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000738 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 return 1;
Herbert Xu50fba2a2006-04-04 13:50:45 -0700740
741discard:
742 kfree_skb(skb);
743 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744}
745
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900746static int ip4ip6_rcv(struct sk_buff *skb)
747{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900748 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
749 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900750}
751
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900752static int ip6ip6_rcv(struct sk_buff *skb)
753{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900754 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
755 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900756}
757
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800758struct ipv6_tel_txoption {
759 struct ipv6_txoptions ops;
760 __u8 dst_opt[8];
761};
762
763static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800765 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800767 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
768 opt->dst_opt[3] = 1;
769 opt->dst_opt[4] = encap_limit;
770 opt->dst_opt[5] = IPV6_TLV_PADN;
771 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800773 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
774 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775}
776
777/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900778 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900780 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 *
782 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900783 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 * doesn't match source of incoming packet.
785 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900786 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 * 1 if conflict,
788 * 0 else
789 **/
790
791static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900792ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793{
794 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
795}
796
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800797static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
798{
799 struct ip6_tnl_parm *p = &t->parms;
800 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700801 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800802
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900803 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800804 struct net_device *ldev = NULL;
805
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100806 rcu_read_lock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800807 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100808 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800809
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700810 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800811 printk(KERN_WARNING
812 "%s xmit: Local address not yet configured!\n",
813 p->name);
814 else if (!ipv6_addr_is_multicast(&p->raddr) &&
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700815 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800816 printk(KERN_WARNING
817 "%s xmit: Routing loop! "
818 "Remote address found on this node!\n",
819 p->name);
820 else
821 ret = 1;
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100822 rcu_read_unlock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800823 }
824 return ret;
825}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826/**
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900827 * ip6_tnl_xmit2 - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900829 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900830 * @dsfield: dscp code for outer header
831 * @fl: flow of tunneled packet
832 * @encap_limit: encapsulation limit
833 * @pmtu: Path MTU is stored if packet is too big
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 *
835 * Description:
836 * Build new header and do some sanity checks on the packet before sending
837 * it.
838 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900839 * Return:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900840 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900841 * -1 fail
842 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 **/
844
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900845static int ip6_tnl_xmit2(struct sk_buff *skb,
846 struct net_device *dev,
847 __u8 dsfield,
848 struct flowi *fl,
849 int encap_limit,
850 __u32 *pmtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851{
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800852 struct net *net = dev_net(dev);
Patrick McHardy2941a482006-01-08 22:05:26 -0800853 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700854 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700855 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800856 struct ipv6_tel_txoption opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 struct dst_entry *dst;
858 struct net_device *tdev;
859 int mtu;
Chuck Leverc2636b42007-10-23 21:07:32 -0700860 unsigned int max_headroom = sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 u8 proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900862 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 int pkt_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 if ((dst = ip6_tnl_dst_check(t)) != NULL)
866 dst_hold(dst);
Patrick McHardya57ebc92005-09-08 14:27:47 -0700867 else {
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800868 dst = ip6_route_output(net, NULL, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800870 if (dst->error || xfrm_lookup(net, &dst, fl, NULL, 0) < 0)
Patrick McHardya57ebc92005-09-08 14:27:47 -0700871 goto tx_err_link_failure;
872 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
874 tdev = dst->dev;
875
876 if (tdev == dev) {
877 stats->collisions++;
878 if (net_ratelimit())
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900879 printk(KERN_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 "%s: Local routing loop detected!\n",
881 t->parms.name);
882 goto tx_err_dst_release;
883 }
884 mtu = dst_mtu(dst) - sizeof (*ipv6h);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800885 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 max_headroom += 8;
887 mtu -= 8;
888 }
889 if (mtu < IPV6_MIN_MTU)
890 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +0000891 if (skb_dst(skb))
892 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 if (skb->len > mtu) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900894 *pmtu = mtu;
895 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 goto tx_err_dst_release;
897 }
898
899 /*
900 * Okay, now see if we can stuff it in the buffer as-is.
901 */
902 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900903
Patrick McHardycfbba492007-07-09 15:33:40 -0700904 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
905 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900907
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
909 goto tx_err_dst_release;
910
911 if (skb->sk)
912 skb_set_owner_w(new_skb, skb->sk);
913 kfree_skb(skb);
914 skb = new_skb;
915 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000916 skb_dst_drop(skb);
917 skb_dst_set(skb, dst_clone(dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700919 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900921 proto = fl->proto;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800922 if (encap_limit >= 0) {
923 init_tel_txopt(&opt, encap_limit);
924 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
925 }
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700926 skb_push(skb, sizeof(struct ipv6hdr));
927 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700928 ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900929 *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 dsfield = INET_ECN_encapsulate(0, dsfield);
931 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 ipv6h->hop_limit = t->parms.hop_limit;
933 ipv6h->nexthdr = proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900934 ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src);
935 ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 nf_reset(skb);
937 pkt_len = skb->len;
Herbert Xuef76bc22008-01-11 19:15:08 -0800938 err = ip6_local_out(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200940 if (net_xmit_eval(err) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 stats->tx_bytes += pkt_len;
942 stats->tx_packets++;
943 } else {
944 stats->tx_errors++;
945 stats->tx_aborted_errors++;
946 }
947 ip6_tnl_dst_store(t, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 return 0;
949tx_err_link_failure:
950 stats->tx_carrier_errors++;
951 dst_link_failure(skb);
952tx_err_dst_release:
953 dst_release(dst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900954 return err;
955}
956
957static inline int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900958ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
959{
960 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700961 struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900962 int encap_limit = -1;
963 struct flowi fl;
964 __u8 dsfield;
965 __u32 mtu;
966 int err;
967
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900968 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
969 !ip6_tnl_xmit_ctl(t))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900970 return -1;
971
972 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
973 encap_limit = t->parms.encap_limit;
974
975 memcpy(&fl, &t->fl, sizeof (fl));
976 fl.proto = IPPROTO_IPIP;
977
978 dsfield = ipv4_get_dsfield(iph);
979
980 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
Al Virob77f2fa2007-07-21 19:09:41 -0700981 fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
982 & IPV6_TCLASS_MASK;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900983
984 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
985 if (err != 0) {
986 /* XXX: send ICMP error even if DF is not set. */
987 if (err == -EMSGSIZE)
988 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
989 htonl(mtu));
990 return -1;
991 }
992
993 return 0;
994}
995
996static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900997ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
998{
999 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001000 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001001 int encap_limit = -1;
1002 __u16 offset;
1003 struct flowi fl;
1004 __u8 dsfield;
1005 __u32 mtu;
1006 int err;
1007
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001008 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1009 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001010 return -1;
1011
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001012 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
1013 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001014 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001015 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001016 if (tel->encap_limit == 0) {
1017 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001018 ICMPV6_HDR_FIELD, offset + 2);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001019 return -1;
1020 }
1021 encap_limit = tel->encap_limit - 1;
1022 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1023 encap_limit = t->parms.encap_limit;
1024
1025 memcpy(&fl, &t->fl, sizeof (fl));
1026 fl.proto = IPPROTO_IPV6;
1027
1028 dsfield = ipv6_get_dsfield(ipv6h);
1029 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
1030 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1031 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
1032 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
1033
1034 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
1035 if (err != 0) {
1036 if (err == -EMSGSIZE)
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001037 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001038 return -1;
1039 }
1040
1041 return 0;
1042}
1043
Stephen Hemminger6fef4c02009-08-31 19:50:41 +00001044static netdev_tx_t
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001045ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1046{
1047 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001048 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001049 int ret;
1050
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001051 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001052 case htons(ETH_P_IP):
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001053 ret = ip4ip6_tnl_xmit(skb, dev);
1054 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001055 case htons(ETH_P_IPV6):
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001056 ret = ip6ip6_tnl_xmit(skb, dev);
1057 break;
1058 default:
1059 goto tx_err;
1060 }
1061
1062 if (ret < 0)
1063 goto tx_err;
1064
Patrick McHardy6ed10652009-06-23 06:03:08 +00001065 return NETDEV_TX_OK;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001066
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067tx_err:
1068 stats->tx_errors++;
1069 stats->tx_dropped++;
1070 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +00001071 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072}
1073
1074static void ip6_tnl_set_cap(struct ip6_tnl *t)
1075{
1076 struct ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001077 int ltype = ipv6_addr_type(&p->laddr);
1078 int rtype = ipv6_addr_type(&p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079
1080 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
1081
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001082 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1083 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1084 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001085 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001086 if (ltype&IPV6_ADDR_UNICAST)
1087 p->flags |= IP6_TNL_F_CAP_XMIT;
1088 if (rtype&IPV6_ADDR_UNICAST)
1089 p->flags |= IP6_TNL_F_CAP_RCV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 }
1091}
1092
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001093static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094{
1095 struct net_device *dev = t->dev;
1096 struct ip6_tnl_parm *p = &t->parms;
1097 struct flowi *fl = &t->fl;
1098
Jiri Pirko3a6d54c2009-05-11 23:37:15 +00001099 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1100 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101
1102 /* Set up flowi template */
1103 ipv6_addr_copy(&fl->fl6_src, &p->laddr);
1104 ipv6_addr_copy(&fl->fl6_dst, &p->raddr);
1105 fl->oif = p->link;
1106 fl->fl6_flowlabel = 0;
1107
1108 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1109 fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1110 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1111 fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1112
1113 ip6_tnl_set_cap(t);
1114
1115 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1116 dev->flags |= IFF_POINTOPOINT;
1117 else
1118 dev->flags &= ~IFF_POINTOPOINT;
1119
1120 dev->iflink = p->link;
1121
1122 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001123 int strict = (ipv6_addr_type(&p->raddr) &
1124 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1125
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001126 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1127 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001128 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
1130 if (rt == NULL)
1131 return;
1132
1133 if (rt->rt6i_dev) {
1134 dev->hard_header_len = rt->rt6i_dev->hard_header_len +
1135 sizeof (struct ipv6hdr);
1136
1137 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr);
1138
1139 if (dev->mtu < IPV6_MIN_MTU)
1140 dev->mtu = IPV6_MIN_MTU;
1141 }
1142 dst_release(&rt->u.dst);
1143 }
1144}
1145
1146/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001147 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 * @t: tunnel to be changed
1149 * @p: tunnel configuration parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 *
1151 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001152 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 **/
1154
1155static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001156ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157{
1158 ipv6_addr_copy(&t->parms.laddr, &p->laddr);
1159 ipv6_addr_copy(&t->parms.raddr, &p->raddr);
1160 t->parms.flags = p->flags;
1161 t->parms.hop_limit = p->hop_limit;
1162 t->parms.encap_limit = p->encap_limit;
1163 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001164 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001165 t->parms.proto = p->proto;
Hugo Santos0c088892006-02-24 13:16:25 -08001166 ip6_tnl_dst_reset(t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001167 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 return 0;
1169}
1170
1171/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001172 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 * @dev: virtual device associated with tunnel
1174 * @ifr: parameters passed from userspace
1175 * @cmd: command to be performed
1176 *
1177 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001178 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001179 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 *
1181 * The possible commands are the following:
1182 * %SIOCGETTUNNEL: get tunnel parameters for device
1183 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1184 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1185 * %SIOCDELTUNNEL: delete tunnel
1186 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001187 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 * initialization, can be used for creating other tunnel devices.
1189 *
1190 * Return:
1191 * 0 on success,
1192 * %-EFAULT if unable to copy data to or from userspace,
1193 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1194 * %-EINVAL if passed tunnel parameters are invalid,
1195 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1196 * %-ENODEV if attempting to change or delete a nonexisting device
1197 **/
1198
1199static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001200ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201{
1202 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 struct ip6_tnl_parm p;
1204 struct ip6_tnl *t = NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001205 struct net *net = dev_net(dev);
1206 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
1208 switch (cmd) {
1209 case SIOCGETTUNNEL:
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001210 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001211 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 err = -EFAULT;
1213 break;
1214 }
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001215 t = ip6_tnl_locate(net, &p, 0);
Ville Nuorvala567131a2006-11-24 17:05:41 -08001216 }
1217 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -08001218 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 memcpy(&p, &t->parms, sizeof (p));
1220 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1221 err = -EFAULT;
1222 }
1223 break;
1224 case SIOCADDTUNNEL:
1225 case SIOCCHGTUNNEL:
1226 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 if (!capable(CAP_NET_ADMIN))
1228 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001229 err = -EFAULT;
1230 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001232 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001233 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1234 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 break;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001236 t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001237 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001238 if (t != NULL) {
1239 if (t->dev != dev) {
1240 err = -EEXIST;
1241 break;
1242 }
1243 } else
1244 t = netdev_priv(dev);
1245
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001246 ip6_tnl_unlink(ip6n, t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001247 err = ip6_tnl_change(t, &p);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001248 ip6_tnl_link(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 netdev_state_change(dev);
1250 }
Ville Nuorvala567131a2006-11-24 17:05:41 -08001251 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 err = 0;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001253 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
1254 err = -EFAULT;
1255
1256 } else
1257 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 break;
1259 case SIOCDELTUNNEL:
1260 err = -EPERM;
1261 if (!capable(CAP_NET_ADMIN))
1262 break;
1263
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001264 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001265 err = -EFAULT;
1266 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001268 err = -ENOENT;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001269 if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001271 err = -EPERM;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001272 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001274 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001276 err = 0;
1277 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 break;
1279 default:
1280 err = -EINVAL;
1281 }
1282 return err;
1283}
1284
1285/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001286 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 * @dev: virtual device associated with tunnel
1288 * @new_mtu: the new mtu
1289 *
1290 * Return:
1291 * 0 on success,
1292 * %-EINVAL if mtu too small
1293 **/
1294
1295static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001296ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297{
1298 if (new_mtu < IPV6_MIN_MTU) {
1299 return -EINVAL;
1300 }
1301 dev->mtu = new_mtu;
1302 return 0;
1303}
1304
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001305
1306static const struct net_device_ops ip6_tnl_netdev_ops = {
1307 .ndo_uninit = ip6_tnl_dev_uninit,
1308 .ndo_start_xmit = ip6_tnl_xmit,
1309 .ndo_do_ioctl = ip6_tnl_ioctl,
1310 .ndo_change_mtu = ip6_tnl_change_mtu,
1311};
1312
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001314 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 * @dev: virtual device associated with tunnel
1316 *
1317 * Description:
1318 * Initialize function pointers and device parameters
1319 **/
1320
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001321static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001323 dev->netdev_ops = &ip6_tnl_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 dev->destructor = free_netdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
1326 dev->type = ARPHRD_TUNNEL6;
1327 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1328 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1329 dev->flags |= IFF_NOARP;
1330 dev->addr_len = sizeof(struct in6_addr);
Pavel Emelyanov554eb272008-04-16 01:24:13 -07001331 dev->features |= NETIF_F_NETNS_LOCAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332}
1333
1334
1335/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001336 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 * @dev: virtual device associated with tunnel
1338 **/
1339
1340static inline void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001341ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342{
Patrick McHardy2941a482006-01-08 22:05:26 -08001343 struct ip6_tnl *t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 t->dev = dev;
1345 strcpy(t->parms.name, dev->name);
1346}
1347
1348/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001349 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 * @dev: virtual device associated with tunnel
1351 **/
1352
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001353static void ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354{
Patrick McHardy2941a482006-01-08 22:05:26 -08001355 struct ip6_tnl *t = netdev_priv(dev);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001356 ip6_tnl_dev_init_gen(dev);
1357 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358}
1359
1360/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001361 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 * @dev: fallback device
1363 *
1364 * Return: 0
1365 **/
1366
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001367static void __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368{
Patrick McHardy2941a482006-01-08 22:05:26 -08001369 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001370 struct net *net = dev_net(dev);
1371 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1372
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001373 ip6_tnl_dev_init_gen(dev);
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001374 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 dev_hold(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001376 ip6n->tnls_wc[0] = t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377}
1378
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001379static struct xfrm6_tunnel ip4ip6_handler = {
1380 .handler = ip4ip6_rcv,
1381 .err_handler = ip4ip6_err,
1382 .priority = 1,
1383};
1384
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385static struct xfrm6_tunnel ip6ip6_handler = {
Patrick McHardy03037702005-07-19 14:03:34 -07001386 .handler = ip6ip6_rcv,
1387 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08001388 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389};
1390
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001391static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001392{
1393 int h;
1394 struct ip6_tnl *t;
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001395 LIST_HEAD(list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001396
1397 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001398 t = ip6n->tnls_r_l[h];
1399 while (t != NULL) {
1400 unregister_netdevice_queue(t->dev, &list);
1401 t = t->next;
1402 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001403 }
1404
1405 t = ip6n->tnls_wc[0];
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001406 unregister_netdevice_queue(t->dev, &list);
1407 unregister_netdevice_many(&list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001408}
1409
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001410static int __net_init ip6_tnl_init_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001411{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001412 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001413 int err;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001414
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001415 ip6n->tnls[0] = ip6n->tnls_wc;
1416 ip6n->tnls[1] = ip6n->tnls_r_l;
1417
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001418 err = -ENOMEM;
1419 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1420 ip6_tnl_dev_setup);
1421
1422 if (!ip6n->fb_tnl_dev)
1423 goto err_alloc_dev;
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001424 dev_net_set(ip6n->fb_tnl_dev, net);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001425
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001426 ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001427
1428 err = register_netdev(ip6n->fb_tnl_dev);
1429 if (err < 0)
1430 goto err_register;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001431 return 0;
1432
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001433err_register:
1434 free_netdev(ip6n->fb_tnl_dev);
1435err_alloc_dev:
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001436 return err;
1437}
1438
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001439static void __net_exit ip6_tnl_exit_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001440{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001441 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001442
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001443 rtnl_lock();
1444 ip6_tnl_destroy_tunnels(ip6n);
1445 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001446}
1447
1448static struct pernet_operations ip6_tnl_net_ops = {
1449 .init = ip6_tnl_init_net,
1450 .exit = ip6_tnl_exit_net,
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001451 .id = &ip6_tnl_net_id,
1452 .size = sizeof(struct ip6_tnl_net),
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001453};
1454
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455/**
1456 * ip6_tunnel_init - register protocol and reserve needed resources
1457 *
1458 * Return: 0 on success
1459 **/
1460
1461static int __init ip6_tunnel_init(void)
1462{
1463 int err;
1464
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001465 err = register_pernet_device(&ip6_tnl_net_ops);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001466 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001467 goto out_pernet;
1468
1469 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1470 if (err < 0) {
1471 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
1472 goto out_ip4ip6;
1473 }
1474
1475 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1476 if (err < 0) {
1477 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
1478 goto out_ip6ip6;
1479 }
1480
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 return 0;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001482
1483out_ip6ip6:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001484 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001485out_ip4ip6:
1486 unregister_pernet_device(&ip6_tnl_net_ops);
1487out_pernet:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 return err;
1489}
1490
1491/**
1492 * ip6_tunnel_cleanup - free resources and unregister protocol
1493 **/
1494
1495static void __exit ip6_tunnel_cleanup(void)
1496{
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001497 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001498 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001499
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001500 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001501 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001503 unregister_pernet_device(&ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504}
1505
1506module_init(ip6_tunnel_init);
1507module_exit(ip6_tunnel_cleanup);