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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
Joe Perchesf3213832012-05-15 14:11:53 +000021#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/module.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080024#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/errno.h>
26#include <linux/types.h>
27#include <linux/sockios.h>
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090028#include <linux/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/if.h>
30#include <linux/in.h>
31#include <linux/ip.h>
32#include <linux/if_tunnel.h>
33#include <linux/net.h>
34#include <linux/in6.h>
35#include <linux/netdevice.h>
36#include <linux/if_arp.h>
37#include <linux/icmpv6.h>
38#include <linux/init.h>
39#include <linux/route.h>
40#include <linux/rtnetlink.h>
41#include <linux/netfilter_ipv6.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090042#include <linux/slab.h>
Eric Dumazetddbe5032012-07-18 08:11:12 +000043#include <linux/hash.h>
Nicolas Dichtele8377352013-08-20 12:16:06 +020044#include <linux/etherdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#include <asm/uaccess.h>
Arun Sharma600634972011-07-26 16:09:06 -070047#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090049#include <net/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <net/ip.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000051#include <net/ip_tunnels.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <net/ip6_route.h>
54#include <net/addrconf.h>
55#include <net/ip6_tunnel.h>
56#include <net/xfrm.h>
57#include <net/dsfield.h>
58#include <net/inet_ecn.h>
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070059#include <net/net_namespace.h>
60#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62MODULE_AUTHOR("Ville Nuorvala");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090063MODULE_DESCRIPTION("IPv6 tunneling device");
Linus Torvalds1da177e2005-04-16 15:20:36 -070064MODULE_LICENSE("GPL");
stephen hemminger6dfbd872011-03-10 11:43:19 +000065MODULE_ALIAS_NETDEV("ip6tnl0");
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#ifdef IP6_TNL_DEBUG
Joe Perches91df42b2012-05-15 14:11:54 +000068#define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#else
70#define IP6_TNL_TRACE(x...) do {;} while(0)
71#endif
72
73#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090074#define IPV6_TCLASS_SHIFT 20
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Eric Dumazetddbe5032012-07-18 08:11:12 +000076#define HASH_SIZE_SHIFT 5
77#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +000079static bool log_ecn_error = true;
80module_param(log_ecn_error, bool, 0644);
81MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
82
Eric Dumazetddbe5032012-07-18 08:11:12 +000083static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
84{
85 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
86
87 return hash_32(hash, HASH_SIZE_SHIFT);
88}
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Eric Dumazet8560f222010-09-28 03:23:34 +000090static int ip6_tnl_dev_init(struct net_device *dev);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +090091static void ip6_tnl_dev_setup(struct net_device *dev);
Nicolas Dichtelc075b132012-11-09 06:10:01 +000092static struct rtnl_link_ops ip6_link_ops __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Eric Dumazetf99189b2009-11-17 10:42:49 +000094static int ip6_tnl_net_id __read_mostly;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070095struct ip6_tnl_net {
Pavel Emelyanov15820e1292008-04-16 01:23:02 -070096 /* the IPv6 tunnel fallback device */
97 struct net_device *fb_tnl_dev;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -070098 /* lists for storing tunnels in use */
Eric Dumazet94767632010-09-15 20:25:34 +000099 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
100 struct ip6_tnl __rcu *tnls_wc[1];
101 struct ip6_tnl __rcu **tnls[2];
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -0700102};
103
Eric Dumazet8560f222010-09-28 03:23:34 +0000104static struct net_device_stats *ip6_get_stats(struct net_device *dev)
105{
106 struct pcpu_tstats sum = { 0 };
107 int i;
108
109 for_each_possible_cpu(i) {
110 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
111
112 sum.rx_packets += tstats->rx_packets;
113 sum.rx_bytes += tstats->rx_bytes;
114 sum.tx_packets += tstats->tx_packets;
115 sum.tx_bytes += tstats->tx_bytes;
116 }
117 dev->stats.rx_packets = sum.rx_packets;
118 dev->stats.rx_bytes = sum.rx_bytes;
119 dev->stats.tx_packets = sum.tx_packets;
120 dev->stats.tx_bytes = sum.tx_bytes;
121 return &dev->stats;
122}
123
Eric Dumazet2922bc82009-10-23 06:34:34 +0000124/*
Eric Dumazet94767632010-09-15 20:25:34 +0000125 * Locking : hash tables are protected by RCU and RTNL
Eric Dumazet2922bc82009-10-23 06:34:34 +0000126 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000128struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
130 struct dst_entry *dst = t->dst_cache;
131
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900132 if (dst && dst->obsolete &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 dst->ops->check(dst, t->dst_cookie) == NULL) {
134 t->dst_cache = NULL;
135 dst_release(dst);
136 return NULL;
137 }
138
139 return dst;
140}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000141EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000143void ip6_tnl_dst_reset(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
145 dst_release(t->dst_cache);
146 t->dst_cache = NULL;
147}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000148EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000150void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
152 struct rt6_info *rt = (struct rt6_info *) dst;
153 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
154 dst_release(t->dst_cache);
155 t->dst_cache = dst;
156}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000157EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900160 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900161 * @remote: the address of the tunnel exit-point
162 * @local: the address of the tunnel entry-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900164 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 * tunnel matching given end-points if found,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900166 * else fallback tunnel if its device is up,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 * else %NULL
168 **/
169
Eric Dumazet2922bc82009-10-23 06:34:34 +0000170#define for_each_ip6_tunnel_rcu(start) \
171 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173static struct ip6_tnl *
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000174ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
Eric Dumazetddbe5032012-07-18 08:11:12 +0000176 unsigned int hash = HASH(remote, local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 struct ip6_tnl *t;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700178 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Eric Dumazetddbe5032012-07-18 08:11:12 +0000180 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (ipv6_addr_equal(local, &t->parms.laddr) &&
182 ipv6_addr_equal(remote, &t->parms.raddr) &&
183 (t->dev->flags & IFF_UP))
184 return t;
185 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000186 t = rcu_dereference(ip6n->tnls_wc[0]);
187 if (t && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 return t;
189
190 return NULL;
191}
192
193/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900194 * ip6_tnl_bucket - get head of list matching given tunnel parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900195 * @p: parameters containing tunnel end-points
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 *
197 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900198 * ip6_tnl_bucket() returns the head of the list matching the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 * &struct in6_addr entries laddr and raddr in @p.
200 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900201 * Return: head of IPv6 tunnel list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 **/
203
Eric Dumazet94767632010-09-15 20:25:34 +0000204static struct ip6_tnl __rcu **
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000205ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000207 const struct in6_addr *remote = &p->raddr;
208 const struct in6_addr *local = &p->laddr;
Eric Dumazet95c96172012-04-15 05:58:06 +0000209 unsigned int h = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 int prio = 0;
211
212 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
213 prio = 1;
Eric Dumazetddbe5032012-07-18 08:11:12 +0000214 h = HASH(remote, local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700216 return &ip6n->tnls[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217}
218
219/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900220 * ip6_tnl_link - add tunnel to hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 * @t: tunnel to be added
222 **/
223
224static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700225ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226{
Eric Dumazet94767632010-09-15 20:25:34 +0000227 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Eric Dumazetcf778b02012-01-12 04:41:32 +0000229 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
230 rcu_assign_pointer(*tp, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231}
232
233/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900234 * ip6_tnl_unlink - remove tunnel from hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 * @t: tunnel to be removed
236 **/
237
238static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700239ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240{
Eric Dumazet94767632010-09-15 20:25:34 +0000241 struct ip6_tnl __rcu **tp;
242 struct ip6_tnl *iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
Eric Dumazet94767632010-09-15 20:25:34 +0000244 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
245 (iter = rtnl_dereference(*tp)) != NULL;
246 tp = &iter->next) {
247 if (t == iter) {
Eric Dumazetcf778b02012-01-12 04:41:32 +0000248 rcu_assign_pointer(*tp, t->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 break;
250 }
251 }
252}
253
Eric Dumazet8560f222010-09-28 03:23:34 +0000254static void ip6_dev_free(struct net_device *dev)
255{
256 free_percpu(dev->tstats);
257 free_netdev(dev);
258}
259
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000260static int ip6_tnl_create2(struct net_device *dev)
261{
262 struct ip6_tnl *t = netdev_priv(dev);
263 struct net *net = dev_net(dev);
264 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
265 int err;
266
267 t = netdev_priv(dev);
268 err = ip6_tnl_dev_init(dev);
269 if (err < 0)
270 goto out;
271
272 err = register_netdevice(dev);
273 if (err < 0)
274 goto out;
275
276 strcpy(t->parms.name, dev->name);
277 dev->rtnl_link_ops = &ip6_link_ops;
278
279 dev_hold(dev);
280 ip6_tnl_link(ip6n, t);
281 return 0;
282
283out:
284 return err;
285}
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000288 * ip6_tnl_create - create a new tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 * @p: tunnel parameters
290 * @pt: pointer to new tunnel
291 *
292 * Description:
293 * Create tunnel matching given parameters.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900294 *
295 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800296 * created tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 **/
298
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000299static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
301 struct net_device *dev;
302 struct ip6_tnl *t;
303 char name[IFNAMSIZ];
304 int err;
305
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800306 if (p->name[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 strlcpy(name, p->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800308 else
309 sprintf(name, "ip6tnl%%d");
310
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900311 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 if (dev == NULL)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800313 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Pavel Emelyanov554eb272008-04-16 01:24:13 -0700315 dev_net_set(dev, net);
316
Patrick McHardy2941a482006-01-08 22:05:26 -0800317 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 t->parms = *p;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200319 t->net = dev_net(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000320 err = ip6_tnl_create2(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +0000321 if (err < 0)
322 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Ville Nuorvala567131a2006-11-24 17:05:41 -0800324 return t;
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800325
326failed_free:
Eric Dumazet8560f222010-09-28 03:23:34 +0000327 ip6_dev_free(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800328failed:
329 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330}
331
332/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900333 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900334 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 * @create: != 0 if allowed to create new tunnel if no match found
336 *
337 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900338 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 * based on @parms. If this is unsuccessful, but @create is set a new
340 * tunnel device is created and registered for use.
341 *
342 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800343 * matching tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 **/
345
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700346static struct ip6_tnl *ip6_tnl_locate(struct net *net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000347 struct __ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000349 const struct in6_addr *remote = &p->raddr;
350 const struct in6_addr *local = &p->laddr;
Eric Dumazet94767632010-09-15 20:25:34 +0000351 struct ip6_tnl __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700353 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
Eric Dumazet94767632010-09-15 20:25:34 +0000355 for (tp = ip6_tnl_bucket(ip6n, p);
356 (t = rtnl_dereference(*tp)) != NULL;
357 tp = &t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Ville Nuorvala567131a2006-11-24 17:05:41 -0800359 ipv6_addr_equal(remote, &t->parms.raddr))
360 return t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 }
362 if (!create)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800363 return NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700364 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365}
366
367/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900368 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900370 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900372 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 **/
374
375static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900376ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
Patrick McHardy2941a482006-01-08 22:05:26 -0800378 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200379 struct net *net = t->net;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700380 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Eric Dumazet94767632010-09-15 20:25:34 +0000382 if (dev == ip6n->fb_tnl_dev)
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000383 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
Eric Dumazet94767632010-09-15 20:25:34 +0000384 else
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700385 ip6_tnl_unlink(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 ip6_tnl_dst_reset(t);
387 dev_put(dev);
388}
389
390/**
391 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
392 * @skb: received socket buffer
393 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900394 * Return:
395 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 * else index to encapsulation limit
397 **/
398
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000399__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000401 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 __u8 nexthdr = ipv6h->nexthdr;
403 __u16 off = sizeof (*ipv6h);
404
405 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
406 __u16 optlen = 0;
407 struct ipv6_opt_hdr *hdr;
408 if (raw + off + sizeof (*hdr) > skb->data &&
409 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
410 break;
411
412 hdr = (struct ipv6_opt_hdr *) (raw + off);
413 if (nexthdr == NEXTHDR_FRAGMENT) {
414 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
415 if (frag_hdr->frag_off)
416 break;
417 optlen = 8;
418 } else if (nexthdr == NEXTHDR_AUTH) {
419 optlen = (hdr->hdrlen + 2) << 2;
420 } else {
421 optlen = ipv6_optlen(hdr);
422 }
423 if (nexthdr == NEXTHDR_DEST) {
424 __u16 i = off + 2;
425 while (1) {
426 struct ipv6_tlv_tnl_enc_lim *tel;
427
428 /* No more room for encapsulation limit */
429 if (i + sizeof (*tel) > off + optlen)
430 break;
431
432 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
433 /* return index of option if found and valid */
434 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
435 tel->length == 1)
436 return i;
437 /* else jump to next option */
438 if (tel->type)
439 i += tel->length + 2;
440 else
441 i++;
442 }
443 }
444 nexthdr = hdr->nexthdr;
445 off += optlen;
446 }
447 return 0;
448}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000449EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
451/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900452 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 *
454 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900455 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 * to the specifications in RFC 2473.
457 **/
458
Herbert Xud2acc342006-03-28 01:12:13 -0800459static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900460ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700461 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000463 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 struct ip6_tnl *t;
465 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700466 u8 rel_type = ICMPV6_DEST_UNREACH;
467 u8 rel_code = ICMPV6_ADDR_UNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 __u32 rel_info = 0;
469 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800470 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900472 /* If the packet doesn't contain the original IPv6 header we are
473 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 processing of the error. */
475
Eric Dumazet2922bc82009-10-23 06:34:34 +0000476 rcu_read_lock();
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700477 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700478 &ipv6h->saddr)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 goto out;
480
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900481 if (t->parms.proto != ipproto && t->parms.proto != 0)
482 goto out;
483
Herbert Xud2acc342006-03-28 01:12:13 -0800484 err = 0;
485
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900486 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 __u32 teli;
488 struct ipv6_tlv_tnl_enc_lim *tel;
489 __u32 mtu;
490 case ICMPV6_DEST_UNREACH:
Joe Perchese87cc472012-05-13 21:56:26 +0000491 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
492 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 rel_msg = 1;
494 break;
495 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900496 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Joe Perchese87cc472012-05-13 21:56:26 +0000497 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
498 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 rel_msg = 1;
500 }
501 break;
502 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800503 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900504 if ((*code) == ICMPV6_HDR_FIELD)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000505 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Al Viro704eae12007-07-26 17:33:29 +0100507 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
509 if (tel->encap_limit == 0) {
Joe Perchese87cc472012-05-13 21:56:26 +0000510 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
511 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 rel_msg = 1;
513 }
Joe Perchese87cc472012-05-13 21:56:26 +0000514 } else {
515 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
516 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 }
518 break;
519 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100520 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 if (mtu < IPV6_MIN_MTU)
522 mtu = IPV6_MIN_MTU;
523 t->dev->mtu = mtu;
524
Al Virocc6cdac2006-02-18 16:02:18 -0500525 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 rel_type = ICMPV6_PKT_TOOBIG;
527 rel_code = 0;
528 rel_info = mtu;
529 rel_msg = 1;
530 }
531 break;
532 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900533
534 *type = rel_type;
535 *code = rel_code;
536 *info = rel_info;
537 *msg = rel_msg;
538
539out:
Eric Dumazet2922bc82009-10-23 06:34:34 +0000540 rcu_read_unlock();
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900541 return err;
542}
543
544static int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900545ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700546 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900547{
548 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700549 u8 rel_type = type;
550 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100551 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900552 int err;
553 struct sk_buff *skb2;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000554 const struct iphdr *eiph;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900555 struct rtable *rt;
David S. Miller31e45432011-05-03 20:25:42 -0700556 struct flowi4 fl4;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900557
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900558 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
559 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900560 if (err < 0)
561 return err;
562
563 if (rel_msg == 0)
564 return 0;
565
566 switch (rel_type) {
567 case ICMPV6_DEST_UNREACH:
568 if (rel_code != ICMPV6_ADDR_UNREACH)
569 return 0;
570 rel_type = ICMP_DEST_UNREACH;
571 rel_code = ICMP_HOST_UNREACH;
572 break;
573 case ICMPV6_PKT_TOOBIG:
574 if (rel_code != 0)
575 return 0;
576 rel_type = ICMP_DEST_UNREACH;
577 rel_code = ICMP_FRAG_NEEDED;
578 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700579 case NDISC_REDIRECT:
580 rel_type = ICMP_REDIRECT;
581 rel_code = ICMP_REDIR_HOST;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900582 default:
583 return 0;
584 }
585
586 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
587 return 0;
588
589 skb2 = skb_clone(skb, GFP_ATOMIC);
590 if (!skb2)
591 return 0;
592
Eric Dumazetadf30902009-06-02 05:19:30 +0000593 skb_dst_drop(skb2);
594
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900595 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700596 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700597 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900598
599 /* Try to guess incoming interface */
David S. Miller31e45432011-05-03 20:25:42 -0700600 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500601 eiph->saddr, 0,
602 0, 0,
603 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800604 if (IS_ERR(rt))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900605 goto out;
606
Changli Gaod8d1f302010-06-10 23:31:35 -0700607 skb2->dev = rt->dst.dev;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900608
609 /* route "incoming" packet */
610 if (rt->rt_flags & RTCF_LOCAL) {
611 ip_rt_put(rt);
612 rt = NULL;
David S. Miller31e45432011-05-03 20:25:42 -0700613 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500614 eiph->daddr, eiph->saddr,
615 0, 0,
616 IPPROTO_IPIP,
617 RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800618 if (IS_ERR(rt) ||
Changli Gaod8d1f302010-06-10 23:31:35 -0700619 rt->dst.dev->type != ARPHRD_TUNNEL) {
David S. Millerb23dd4f2011-03-02 14:31:35 -0800620 if (!IS_ERR(rt))
621 ip_rt_put(rt);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900622 goto out;
623 }
David S. Millerb23dd4f2011-03-02 14:31:35 -0800624 skb_dst_set(skb2, &rt->dst);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900625 } else {
626 ip_rt_put(rt);
627 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
628 skb2->dev) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000629 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900630 goto out;
631 }
632
633 /* change mtu on this route */
634 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000635 if (rel_info > dst_mtu(skb_dst(skb2)))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900636 goto out;
637
David S. Miller6700c272012-07-17 03:29:28 -0700638 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900639 }
David S. Miller1ed5c482012-07-12 00:41:25 -0700640 if (rel_type == ICMP_REDIRECT)
David S. Miller6700c272012-07-17 03:29:28 -0700641 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900642
Al Viro704eae12007-07-26 17:33:29 +0100643 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900644
645out:
646 kfree_skb(skb2);
647 return 0;
648}
649
650static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900651ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700652 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900653{
654 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700655 u8 rel_type = type;
656 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100657 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900658 int err;
659
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900660 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
661 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900662 if (err < 0)
663 return err;
664
665 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 struct rt6_info *rt;
667 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800668
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900670 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
Eric Dumazetadf30902009-06-02 05:19:30 +0000672 skb_dst_drop(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700674 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
676 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700677 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
678 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
David S. Millerd1918542011-12-28 20:19:20 -0500680 if (rt && rt->dst.dev)
681 skb2->dev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000683 icmpv6_send(skb2, rel_type, rel_code, rel_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
Amerigo Wang94e187c2012-10-29 00:13:19 +0000685 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
687 kfree_skb(skb2);
688 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900689
690 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691}
692
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000693static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
694 const struct ipv6hdr *ipv6h,
695 struct sk_buff *skb)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900696{
697 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
698
699 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700700 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900701
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000702 return IP6_ECN_decapsulate(ipv6h, skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900703}
704
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000705static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
706 const struct ipv6hdr *ipv6h,
707 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900709 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b42007-11-13 21:40:13 -0800710 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000712 return IP6_ECN_decapsulate(ipv6h, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900714
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000715__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000716 const struct in6_addr *laddr,
717 const struct in6_addr *raddr)
718{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000719 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000720 int ltype = ipv6_addr_type(laddr);
721 int rtype = ipv6_addr_type(raddr);
722 __u32 flags = 0;
723
724 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
725 flags = IP6_TNL_F_CAP_PER_PACKET;
726 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
727 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
728 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
729 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
730 if (ltype&IPV6_ADDR_UNICAST)
731 flags |= IP6_TNL_F_CAP_XMIT;
732 if (rtype&IPV6_ADDR_UNICAST)
733 flags |= IP6_TNL_F_CAP_RCV;
734 }
735 return flags;
736}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000737EXPORT_SYMBOL(ip6_tnl_get_cap);
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000738
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100739/* called with rcu_read_lock() */
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000740int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000741 const struct in6_addr *laddr,
742 const struct in6_addr *raddr)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800743{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000744 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800745 int ret = 0;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200746 struct net *net = t->net;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800747
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000748 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
749 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
750 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900751 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800752
753 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100754 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800755
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000756 if ((ipv6_addr_is_multicast(laddr) ||
757 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
758 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800759 ret = 1;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800760 }
761 return ret;
762}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000763EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
765/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900766 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 * @skb: received socket buffer
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900768 * @protocol: ethernet protocol ID
769 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 *
771 * Return: 0
772 **/
773
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900774static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900775 __u8 ipproto,
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000776 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
777 const struct ipv6hdr *ipv6h,
778 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 struct ip6_tnl *t;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000781 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000782 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Eric Dumazet2922bc82009-10-23 06:34:34 +0000784 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700786 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700787 &ipv6h->daddr)) != NULL) {
Eric Dumazet8560f222010-09-28 03:23:34 +0000788 struct pcpu_tstats *tstats;
789
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900790 if (t->parms.proto != ipproto && t->parms.proto != 0) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000791 rcu_read_unlock();
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900792 goto discard;
793 }
794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000796 rcu_read_unlock();
Herbert Xu50fba2a2006-04-04 13:50:45 -0700797 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 }
799
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000800 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700801 t->dev->stats.rx_dropped++;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000802 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 goto discard;
804 }
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700805 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700806 skb_reset_network_header(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900807 skb->protocol = htons(protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700809
Nicolas Dichtelea231922013-09-02 15:34:58 +0200810 __skb_tunnel_rx(skb, t->dev, t->net);
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000811
812 err = dscp_ecn_decapsulate(t, ipv6h, skb);
813 if (unlikely(err)) {
814 if (log_ecn_error)
815 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
816 &ipv6h->saddr,
817 ipv6_get_dsfield(ipv6h));
818 if (err > 1) {
819 ++t->dev->stats.rx_frame_errors;
820 ++t->dev->stats.rx_errors;
821 rcu_read_unlock();
822 goto discard;
823 }
824 }
825
Eric Dumazet8560f222010-09-28 03:23:34 +0000826 tstats = this_cpu_ptr(t->dev->tstats);
827 tstats->rx_packets++;
828 tstats->rx_bytes += skb->len;
829
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000830 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000831
Eric Dumazet2922bc82009-10-23 06:34:34 +0000832 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 return 0;
834 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000835 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 return 1;
Herbert Xu50fba2a2006-04-04 13:50:45 -0700837
838discard:
839 kfree_skb(skb);
840 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841}
842
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900843static int ip4ip6_rcv(struct sk_buff *skb)
844{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900845 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
846 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900847}
848
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900849static int ip6ip6_rcv(struct sk_buff *skb)
850{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900851 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
852 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900853}
854
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800855struct ipv6_tel_txoption {
856 struct ipv6_txoptions ops;
857 __u8 dst_opt[8];
858};
859
860static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800862 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800864 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
865 opt->dst_opt[3] = 1;
866 opt->dst_opt[4] = encap_limit;
867 opt->dst_opt[5] = IPV6_TLV_PADN;
868 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800870 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
871 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872}
873
874/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900875 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900877 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 *
879 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900880 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 * doesn't match source of incoming packet.
882 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900883 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 * 1 if conflict,
885 * 0 else
886 **/
887
Eric Dumazet92113bf2012-05-18 08:14:11 +0200888static inline bool
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000889ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890{
891 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
892}
893
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000894int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800895{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000896 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800897 int ret = 0;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200898 struct net *net = t->net;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800899
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900900 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800901 struct net_device *ldev = NULL;
902
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100903 rcu_read_lock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800904 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100905 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800906
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700907 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000908 pr_warn("%s xmit: Local address not yet configured!\n",
909 p->name);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800910 else if (!ipv6_addr_is_multicast(&p->raddr) &&
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700911 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000912 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
913 p->name);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800914 else
915 ret = 1;
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100916 rcu_read_unlock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800917 }
918 return ret;
919}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000920EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
921
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922/**
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900923 * ip6_tnl_xmit2 - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900925 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900926 * @dsfield: dscp code for outer header
927 * @fl: flow of tunneled packet
928 * @encap_limit: encapsulation limit
929 * @pmtu: Path MTU is stored if packet is too big
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 *
931 * Description:
932 * Build new header and do some sanity checks on the packet before sending
933 * it.
934 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900935 * Return:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900936 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900937 * -1 fail
938 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 **/
940
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900941static int ip6_tnl_xmit2(struct sk_buff *skb,
942 struct net_device *dev,
943 __u8 dsfield,
David S. Miller4c9483b2011-03-12 16:22:43 -0500944 struct flowi6 *fl6,
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900945 int encap_limit,
946 __u32 *pmtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947{
Patrick McHardy2941a482006-01-08 22:05:26 -0800948 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200949 struct net *net = t->net;
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700950 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700951 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800952 struct ipv6_tel_txoption opt;
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400953 struct dst_entry *dst = NULL, *ndst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 struct net_device *tdev;
955 int mtu;
Chuck Leverc2636b42007-10-23 21:07:32 -0700956 unsigned int max_headroom = sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 u8 proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900958 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400960 if (!fl6->flowi6_mark)
961 dst = ip6_tnl_dst_check(t);
Eric Dumazet89b02122011-07-28 04:32:25 +0000962 if (!dst) {
963 ndst = ip6_route_output(net, NULL, fl6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964
Eric Dumazet89b02122011-07-28 04:32:25 +0000965 if (ndst->error)
Patrick McHardya57ebc92005-09-08 14:27:47 -0700966 goto tx_err_link_failure;
Eric Dumazet89b02122011-07-28 04:32:25 +0000967 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
968 if (IS_ERR(ndst)) {
969 err = PTR_ERR(ndst);
970 ndst = NULL;
David S. Miller452edd52011-03-02 13:27:41 -0800971 goto tx_err_link_failure;
972 }
Eric Dumazet89b02122011-07-28 04:32:25 +0000973 dst = ndst;
Patrick McHardya57ebc92005-09-08 14:27:47 -0700974 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
976 tdev = dst->dev;
977
978 if (tdev == dev) {
979 stats->collisions++;
Joe Perchese87cc472012-05-13 21:56:26 +0000980 net_warn_ratelimited("%s: Local routing loop detected!\n",
981 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 goto tx_err_dst_release;
983 }
984 mtu = dst_mtu(dst) - sizeof (*ipv6h);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800985 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 max_headroom += 8;
987 mtu -= 8;
988 }
989 if (mtu < IPV6_MIN_MTU)
990 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +0000991 if (skb_dst(skb))
David S. Miller6700c272012-07-17 03:29:28 -0700992 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 if (skb->len > mtu) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900994 *pmtu = mtu;
995 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 goto tx_err_dst_release;
997 }
998
Nicolas Dichtel963a88b2013-09-02 15:34:57 +0200999 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 /*
1002 * Okay, now see if we can stuff it in the buffer as-is.
1003 */
1004 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001005
Patrick McHardycfbba492007-07-09 15:33:40 -07001006 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1007 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001009
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
1011 goto tx_err_dst_release;
1012
1013 if (skb->sk)
1014 skb_set_owner_w(new_skb, skb->sk);
Eric Dumazet9ff26442012-04-19 02:24:17 +00001015 consume_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 skb = new_skb;
1017 }
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001018 if (fl6->flowi6_mark) {
1019 skb_dst_set(skb, dst);
1020 ndst = NULL;
1021 } else {
1022 skb_dst_set_noref(skb, dst);
1023 }
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07001024 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025
David S. Miller4c9483b2011-03-12 16:22:43 -05001026 proto = fl6->flowi6_proto;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -08001027 if (encap_limit >= 0) {
1028 init_tel_txopt(&opt, encap_limit);
1029 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1030 }
Hannes Frederic Sowa3d483052013-08-18 13:46:52 +02001031
1032 if (likely(!skb->encapsulation)) {
1033 skb_reset_inner_headers(skb);
1034 skb->encapsulation = 1;
1035 }
1036
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -07001037 skb_push(skb, sizeof(struct ipv6hdr));
1038 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001039 ipv6h = ipv6_hdr(skb);
YOSHIFUJI Hideaki / 吉藤英明3e4e4c12013-01-13 05:01:39 +00001040 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 ipv6h->hop_limit = t->parms.hop_limit;
1042 ipv6h->nexthdr = proto;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001043 ipv6h->saddr = fl6->saddr;
1044 ipv6h->daddr = fl6->daddr;
Cong Wange8f72ea2013-03-09 23:00:39 +00001045 ip6tunnel_xmit(skb, dev);
Eric Dumazet89b02122011-07-28 04:32:25 +00001046 if (ndst)
1047 ip6_tnl_dst_store(t, ndst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 return 0;
1049tx_err_link_failure:
1050 stats->tx_carrier_errors++;
1051 dst_link_failure(skb);
1052tx_err_dst_release:
Eric Dumazet89b02122011-07-28 04:32:25 +00001053 dst_release(ndst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001054 return err;
1055}
1056
1057static inline int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001058ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1059{
1060 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001061 const struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001062 int encap_limit = -1;
David S. Miller4c9483b2011-03-12 16:22:43 -05001063 struct flowi6 fl6;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001064 __u8 dsfield;
1065 __u32 mtu;
1066 int err;
1067
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001068 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1069 !ip6_tnl_xmit_ctl(t))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001070 return -1;
1071
1072 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1073 encap_limit = t->parms.encap_limit;
1074
David S. Miller4c9483b2011-03-12 16:22:43 -05001075 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1076 fl6.flowi6_proto = IPPROTO_IPIP;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001077
1078 dsfield = ipv4_get_dsfield(iph);
1079
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001080 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001081 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
Al Virob77f2fa2007-07-21 19:09:41 -07001082 & IPV6_TCLASS_MASK;
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001083 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1084 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001085
David S. Miller4c9483b2011-03-12 16:22:43 -05001086 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001087 if (err != 0) {
1088 /* XXX: send ICMP error even if DF is not set. */
1089 if (err == -EMSGSIZE)
1090 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1091 htonl(mtu));
1092 return -1;
1093 }
1094
1095 return 0;
1096}
1097
1098static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001099ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1100{
1101 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001102 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001103 int encap_limit = -1;
1104 __u16 offset;
David S. Miller4c9483b2011-03-12 16:22:43 -05001105 struct flowi6 fl6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001106 __u8 dsfield;
1107 __u32 mtu;
1108 int err;
1109
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001110 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1111 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001112 return -1;
1113
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001114 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001115 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001116 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001117 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001118 if (tel->encap_limit == 0) {
1119 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001120 ICMPV6_HDR_FIELD, offset + 2);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001121 return -1;
1122 }
1123 encap_limit = tel->encap_limit - 1;
1124 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1125 encap_limit = t->parms.encap_limit;
1126
David S. Miller4c9483b2011-03-12 16:22:43 -05001127 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1128 fl6.flowi6_proto = IPPROTO_IPV6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001129
1130 dsfield = ipv6_get_dsfield(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001131 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001132 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001133 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
David S. Miller4c9483b2011-03-12 16:22:43 -05001134 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001135 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1136 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001137
David S. Miller4c9483b2011-03-12 16:22:43 -05001138 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001139 if (err != 0) {
1140 if (err == -EMSGSIZE)
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001141 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001142 return -1;
1143 }
1144
1145 return 0;
1146}
1147
Stephen Hemminger6fef4c02009-08-31 19:50:41 +00001148static netdev_tx_t
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001149ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1150{
1151 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001152 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001153 int ret;
1154
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001155 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001156 case htons(ETH_P_IP):
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001157 ret = ip4ip6_tnl_xmit(skb, dev);
1158 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001159 case htons(ETH_P_IPV6):
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001160 ret = ip6ip6_tnl_xmit(skb, dev);
1161 break;
1162 default:
1163 goto tx_err;
1164 }
1165
1166 if (ret < 0)
1167 goto tx_err;
1168
Patrick McHardy6ed10652009-06-23 06:03:08 +00001169 return NETDEV_TX_OK;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001170
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171tx_err:
1172 stats->tx_errors++;
1173 stats->tx_dropped++;
1174 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +00001175 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176}
1177
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001178static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179{
1180 struct net_device *dev = t->dev;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001181 struct __ip6_tnl_parm *p = &t->parms;
David S. Miller4c9483b2011-03-12 16:22:43 -05001182 struct flowi6 *fl6 = &t->fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
Jiri Pirko3a6d54c2009-05-11 23:37:15 +00001184 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1185 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
1187 /* Set up flowi template */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001188 fl6->saddr = p->laddr;
1189 fl6->daddr = p->raddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001190 fl6->flowi6_oif = p->link;
1191 fl6->flowlabel = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192
1193 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001194 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001196 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001198 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1199 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200
1201 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1202 dev->flags |= IFF_POINTOPOINT;
1203 else
1204 dev->flags &= ~IFF_POINTOPOINT;
1205
1206 dev->iflink = p->link;
1207
1208 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001209 int strict = (ipv6_addr_type(&p->raddr) &
1210 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1211
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001212 struct rt6_info *rt = rt6_lookup(t->net,
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001213 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001214 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215
1216 if (rt == NULL)
1217 return;
1218
David S. Millerd1918542011-12-28 20:19:20 -05001219 if (rt->dst.dev) {
1220 dev->hard_header_len = rt->dst.dev->hard_header_len +
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 sizeof (struct ipv6hdr);
1222
David S. Millerd1918542011-12-28 20:19:20 -05001223 dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001224 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1225 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226
1227 if (dev->mtu < IPV6_MIN_MTU)
1228 dev->mtu = IPV6_MIN_MTU;
1229 }
Amerigo Wang94e187c2012-10-29 00:13:19 +00001230 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 }
1232}
1233
1234/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001235 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 * @t: tunnel to be changed
1237 * @p: tunnel configuration parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 *
1239 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001240 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 **/
1242
1243static int
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001244ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245{
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001246 t->parms.laddr = p->laddr;
1247 t->parms.raddr = p->raddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 t->parms.flags = p->flags;
1249 t->parms.hop_limit = p->hop_limit;
1250 t->parms.encap_limit = p->encap_limit;
1251 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001252 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001253 t->parms.proto = p->proto;
Hugo Santos0c088892006-02-24 13:16:25 -08001254 ip6_tnl_dst_reset(t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001255 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 return 0;
1257}
1258
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001259static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1260{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001261 struct net *net = t->net;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001262 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1263 int err;
1264
1265 ip6_tnl_unlink(ip6n, t);
1266 synchronize_net();
1267 err = ip6_tnl_change(t, p);
1268 ip6_tnl_link(ip6n, t);
1269 netdev_state_change(t->dev);
1270 return err;
1271}
1272
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001273static void
1274ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1275{
1276 p->laddr = u->laddr;
1277 p->raddr = u->raddr;
1278 p->flags = u->flags;
1279 p->hop_limit = u->hop_limit;
1280 p->encap_limit = u->encap_limit;
1281 p->flowinfo = u->flowinfo;
1282 p->link = u->link;
1283 p->proto = u->proto;
1284 memcpy(p->name, u->name, sizeof(u->name));
1285}
1286
1287static void
1288ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1289{
1290 u->laddr = p->laddr;
1291 u->raddr = p->raddr;
1292 u->flags = p->flags;
1293 u->hop_limit = p->hop_limit;
1294 u->encap_limit = p->encap_limit;
1295 u->flowinfo = p->flowinfo;
1296 u->link = p->link;
1297 u->proto = p->proto;
1298 memcpy(u->name, p->name, sizeof(u->name));
1299}
1300
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001302 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 * @dev: virtual device associated with tunnel
1304 * @ifr: parameters passed from userspace
1305 * @cmd: command to be performed
1306 *
1307 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001308 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001309 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 *
1311 * The possible commands are the following:
1312 * %SIOCGETTUNNEL: get tunnel parameters for device
1313 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1314 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1315 * %SIOCDELTUNNEL: delete tunnel
1316 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001317 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 * initialization, can be used for creating other tunnel devices.
1319 *
1320 * Return:
1321 * 0 on success,
1322 * %-EFAULT if unable to copy data to or from userspace,
1323 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1324 * %-EINVAL if passed tunnel parameters are invalid,
1325 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1326 * %-ENODEV if attempting to change or delete a nonexisting device
1327 **/
1328
1329static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001330ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331{
1332 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 struct ip6_tnl_parm p;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001334 struct __ip6_tnl_parm p1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 struct ip6_tnl *t = NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001336 struct net *net = dev_net(dev);
1337 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
1339 switch (cmd) {
1340 case SIOCGETTUNNEL:
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001341 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001342 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 err = -EFAULT;
1344 break;
1345 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001346 ip6_tnl_parm_from_user(&p1, &p);
1347 t = ip6_tnl_locate(net, &p1, 0);
Dan Carpenter5ef5d6c2012-08-16 03:14:04 +00001348 } else {
1349 memset(&p, 0, sizeof(p));
Ville Nuorvala567131a2006-11-24 17:05:41 -08001350 }
1351 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -08001352 t = netdev_priv(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001353 ip6_tnl_parm_to_user(&p, &t->parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1355 err = -EFAULT;
1356 }
1357 break;
1358 case SIOCADDTUNNEL:
1359 case SIOCCHGTUNNEL:
1360 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001361 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001363 err = -EFAULT;
1364 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001366 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001367 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1368 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 break;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001370 ip6_tnl_parm_from_user(&p1, &p);
1371 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001372 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001373 if (t != NULL) {
1374 if (t->dev != dev) {
1375 err = -EEXIST;
1376 break;
1377 }
1378 } else
1379 t = netdev_priv(dev);
1380
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001381 err = ip6_tnl_update(t, &p1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 }
Ville Nuorvala567131a2006-11-24 17:05:41 -08001383 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 err = 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001385 ip6_tnl_parm_to_user(&p, &t->parms);
1386 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
Ville Nuorvala567131a2006-11-24 17:05:41 -08001387 err = -EFAULT;
1388
1389 } else
1390 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 break;
1392 case SIOCDELTUNNEL:
1393 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001394 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 break;
1396
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001397 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001398 err = -EFAULT;
1399 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001401 err = -ENOENT;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001402 ip6_tnl_parm_from_user(&p1, &p);
1403 t = ip6_tnl_locate(net, &p1, 0);
1404 if (t == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001406 err = -EPERM;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001407 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001409 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001411 err = 0;
1412 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 break;
1414 default:
1415 err = -EINVAL;
1416 }
1417 return err;
1418}
1419
1420/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001421 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 * @dev: virtual device associated with tunnel
1423 * @new_mtu: the new mtu
1424 *
1425 * Return:
1426 * 0 on success,
1427 * %-EINVAL if mtu too small
1428 **/
1429
1430static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001431ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432{
Oussama Ghorbel582442d2013-10-03 14:49:26 +01001433 struct ip6_tnl *tnl = netdev_priv(dev);
1434
1435 if (tnl->parms.proto == IPPROTO_IPIP) {
1436 if (new_mtu < 68)
1437 return -EINVAL;
1438 } else {
1439 if (new_mtu < IPV6_MIN_MTU)
1440 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 }
Oussama Ghorbel582442d2013-10-03 14:49:26 +01001442 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1443 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 dev->mtu = new_mtu;
1445 return 0;
1446}
1447
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001448
1449static const struct net_device_ops ip6_tnl_netdev_ops = {
Eric Dumazet8560f222010-09-28 03:23:34 +00001450 .ndo_uninit = ip6_tnl_dev_uninit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001451 .ndo_start_xmit = ip6_tnl_xmit,
Eric Dumazet8560f222010-09-28 03:23:34 +00001452 .ndo_do_ioctl = ip6_tnl_ioctl,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001453 .ndo_change_mtu = ip6_tnl_change_mtu,
Eric Dumazet8560f222010-09-28 03:23:34 +00001454 .ndo_get_stats = ip6_get_stats,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001455};
1456
Eric Dumazet8560f222010-09-28 03:23:34 +00001457
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001459 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 * @dev: virtual device associated with tunnel
1461 *
1462 * Description:
1463 * Initialize function pointers and device parameters
1464 **/
1465
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001466static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467{
Anders Franzen381601e2010-11-24 05:47:18 +00001468 struct ip6_tnl *t;
1469
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001470 dev->netdev_ops = &ip6_tnl_netdev_ops;
Eric Dumazet8560f222010-09-28 03:23:34 +00001471 dev->destructor = ip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472
1473 dev->type = ARPHRD_TUNNEL6;
1474 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1475 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001476 t = netdev_priv(dev);
1477 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1478 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 dev->flags |= IFF_NOARP;
1480 dev->addr_len = sizeof(struct in6_addr);
Anders Franzen7e223de2010-10-19 03:50:47 +00001481 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Nicolas Dichtele8377352013-08-20 12:16:06 +02001482 /* This perm addr will be used as interface identifier by IPv6 */
1483 dev->addr_assign_type = NET_ADDR_RANDOM;
1484 eth_random_addr(dev->perm_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485}
1486
1487
1488/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001489 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 * @dev: virtual device associated with tunnel
1491 **/
1492
Eric Dumazet8560f222010-09-28 03:23:34 +00001493static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001494ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495{
Patrick McHardy2941a482006-01-08 22:05:26 -08001496 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001497
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 t->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001499 t->net = dev_net(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001500 dev->tstats = alloc_percpu(struct pcpu_tstats);
1501 if (!dev->tstats)
1502 return -ENOMEM;
1503 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504}
1505
1506/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001507 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 * @dev: virtual device associated with tunnel
1509 **/
1510
Eric Dumazet8560f222010-09-28 03:23:34 +00001511static int ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512{
Patrick McHardy2941a482006-01-08 22:05:26 -08001513 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001514 int err = ip6_tnl_dev_init_gen(dev);
1515
1516 if (err)
1517 return err;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001518 ip6_tnl_link_config(t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001519 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520}
1521
1522/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001523 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 * @dev: fallback device
1525 *
1526 * Return: 0
1527 **/
1528
Eric Dumazet8560f222010-09-28 03:23:34 +00001529static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530{
Patrick McHardy2941a482006-01-08 22:05:26 -08001531 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001532 struct net *net = dev_net(dev);
1533 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Eric Dumazet8560f222010-09-28 03:23:34 +00001534 int err = ip6_tnl_dev_init_gen(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001535
Eric Dumazet8560f222010-09-28 03:23:34 +00001536 if (err)
1537 return err;
1538
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001539 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 dev_hold(dev);
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001541
1542 ip6_tnl_link_config(t);
1543
Eric Dumazetcf778b02012-01-12 04:41:32 +00001544 rcu_assign_pointer(ip6n->tnls_wc[0], t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001545 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546}
1547
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001548static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1549{
1550 u8 proto;
1551
1552 if (!data)
1553 return 0;
1554
1555 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1556 if (proto != IPPROTO_IPV6 &&
1557 proto != IPPROTO_IPIP &&
1558 proto != 0)
1559 return -EINVAL;
1560
1561 return 0;
1562}
1563
1564static void ip6_tnl_netlink_parms(struct nlattr *data[],
1565 struct __ip6_tnl_parm *parms)
1566{
1567 memset(parms, 0, sizeof(*parms));
1568
1569 if (!data)
1570 return;
1571
1572 if (data[IFLA_IPTUN_LINK])
1573 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1574
1575 if (data[IFLA_IPTUN_LOCAL])
1576 nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],
1577 sizeof(struct in6_addr));
1578
1579 if (data[IFLA_IPTUN_REMOTE])
1580 nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],
1581 sizeof(struct in6_addr));
1582
1583 if (data[IFLA_IPTUN_TTL])
1584 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1585
1586 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1587 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1588
1589 if (data[IFLA_IPTUN_FLOWINFO])
Nicolas Dichtel1ff05fb2012-11-15 04:06:42 +00001590 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001591
1592 if (data[IFLA_IPTUN_FLAGS])
1593 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1594
1595 if (data[IFLA_IPTUN_PROTO])
1596 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1597}
1598
1599static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1600 struct nlattr *tb[], struct nlattr *data[])
1601{
1602 struct net *net = dev_net(dev);
1603 struct ip6_tnl *nt;
1604
1605 nt = netdev_priv(dev);
1606 ip6_tnl_netlink_parms(data, &nt->parms);
1607
1608 if (ip6_tnl_locate(net, &nt->parms, 0))
1609 return -EEXIST;
1610
1611 return ip6_tnl_create2(dev);
1612}
1613
1614static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1615 struct nlattr *data[])
1616{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001617 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001618 struct __ip6_tnl_parm p;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001619 struct net *net = t->net;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001620 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1621
1622 if (dev == ip6n->fb_tnl_dev)
1623 return -EINVAL;
1624
1625 ip6_tnl_netlink_parms(data, &p);
1626
1627 t = ip6_tnl_locate(net, &p, 0);
1628
1629 if (t) {
1630 if (t->dev != dev)
1631 return -EEXIST;
1632 } else
1633 t = netdev_priv(dev);
1634
1635 return ip6_tnl_update(t, &p);
1636}
1637
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001638static size_t ip6_tnl_get_size(const struct net_device *dev)
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001639{
1640 return
1641 /* IFLA_IPTUN_LINK */
1642 nla_total_size(4) +
1643 /* IFLA_IPTUN_LOCAL */
1644 nla_total_size(sizeof(struct in6_addr)) +
1645 /* IFLA_IPTUN_REMOTE */
1646 nla_total_size(sizeof(struct in6_addr)) +
1647 /* IFLA_IPTUN_TTL */
1648 nla_total_size(1) +
1649 /* IFLA_IPTUN_ENCAP_LIMIT */
1650 nla_total_size(1) +
1651 /* IFLA_IPTUN_FLOWINFO */
1652 nla_total_size(4) +
1653 /* IFLA_IPTUN_FLAGS */
1654 nla_total_size(4) +
Nicolas Dichtelcfa323b2012-11-14 05:13:58 +00001655 /* IFLA_IPTUN_PROTO */
1656 nla_total_size(1) +
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001657 0;
1658}
1659
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001660static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001661{
1662 struct ip6_tnl *tunnel = netdev_priv(dev);
1663 struct __ip6_tnl_parm *parm = &tunnel->parms;
1664
1665 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1666 nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001667 &parm->laddr) ||
Ding Zhi0d2ede92013-09-16 11:31:15 +02001668 nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
1669 &parm->raddr) ||
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001670 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1671 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1672 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
Nicolas Dichtelcfa323b2012-11-14 05:13:58 +00001673 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1674 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001675 goto nla_put_failure;
1676 return 0;
1677
1678nla_put_failure:
1679 return -EMSGSIZE;
1680}
1681
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001682static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1683 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1684 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1685 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1686 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1687 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1688 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1689 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1690 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1691};
1692
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001693static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1694 .kind = "ip6tnl",
1695 .maxtype = IFLA_IPTUN_MAX,
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001696 .policy = ip6_tnl_policy,
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001697 .priv_size = sizeof(struct ip6_tnl),
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001698 .setup = ip6_tnl_dev_setup,
1699 .validate = ip6_tnl_validate,
1700 .newlink = ip6_tnl_newlink,
1701 .changelink = ip6_tnl_changelink,
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001702 .get_size = ip6_tnl_get_size,
1703 .fill_info = ip6_tnl_fill_info,
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001704};
1705
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001706static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001707 .handler = ip4ip6_rcv,
1708 .err_handler = ip4ip6_err,
1709 .priority = 1,
1710};
1711
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001712static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
Patrick McHardy03037702005-07-19 14:03:34 -07001713 .handler = ip6ip6_rcv,
1714 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08001715 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716};
1717
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001718static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001719{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001720 struct net *net = dev_net(ip6n->fb_tnl_dev);
1721 struct net_device *dev, *aux;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001722 int h;
1723 struct ip6_tnl *t;
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001724 LIST_HEAD(list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001725
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001726 for_each_netdev_safe(net, dev, aux)
1727 if (dev->rtnl_link_ops == &ip6_link_ops)
1728 unregister_netdevice_queue(dev, &list);
1729
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001730 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet94767632010-09-15 20:25:34 +00001731 t = rtnl_dereference(ip6n->tnls_r_l[h]);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001732 while (t != NULL) {
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001733 /* If dev is in the same netns, it has already
1734 * been added to the list by the previous loop.
1735 */
1736 if (!net_eq(dev_net(t->dev), net))
1737 unregister_netdevice_queue(t->dev, &list);
Eric Dumazet94767632010-09-15 20:25:34 +00001738 t = rtnl_dereference(t->next);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001739 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001740 }
1741
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001742 unregister_netdevice_many(&list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001743}
1744
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001745static int __net_init ip6_tnl_init_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001746{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001747 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Josh Boyer731abb92011-11-10 15:10:23 +00001748 struct ip6_tnl *t = NULL;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001749 int err;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001750
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001751 ip6n->tnls[0] = ip6n->tnls_wc;
1752 ip6n->tnls[1] = ip6n->tnls_r_l;
1753
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001754 err = -ENOMEM;
1755 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1756 ip6_tnl_dev_setup);
1757
1758 if (!ip6n->fb_tnl_dev)
1759 goto err_alloc_dev;
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001760 dev_net_set(ip6n->fb_tnl_dev, net);
Nicolas Dichtelbb814092013-10-01 18:05:00 +02001761 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001762 /* FB netdevice is special: we have one, and only one per netns.
1763 * Allowing to move it to another netns is clearly unsafe.
1764 */
1765 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001766
Eric Dumazet8560f222010-09-28 03:23:34 +00001767 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1768 if (err < 0)
1769 goto err_register;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001770
1771 err = register_netdev(ip6n->fb_tnl_dev);
1772 if (err < 0)
1773 goto err_register;
Josh Boyer731abb92011-11-10 15:10:23 +00001774
1775 t = netdev_priv(ip6n->fb_tnl_dev);
1776
1777 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001778 return 0;
1779
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001780err_register:
Eric Dumazet8560f222010-09-28 03:23:34 +00001781 ip6_dev_free(ip6n->fb_tnl_dev);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001782err_alloc_dev:
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001783 return err;
1784}
1785
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001786static void __net_exit ip6_tnl_exit_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001787{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001788 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001789
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001790 rtnl_lock();
1791 ip6_tnl_destroy_tunnels(ip6n);
1792 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001793}
1794
1795static struct pernet_operations ip6_tnl_net_ops = {
1796 .init = ip6_tnl_init_net,
1797 .exit = ip6_tnl_exit_net,
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001798 .id = &ip6_tnl_net_id,
1799 .size = sizeof(struct ip6_tnl_net),
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001800};
1801
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802/**
1803 * ip6_tunnel_init - register protocol and reserve needed resources
1804 *
1805 * Return: 0 on success
1806 **/
1807
1808static int __init ip6_tunnel_init(void)
1809{
1810 int err;
1811
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001812 err = register_pernet_device(&ip6_tnl_net_ops);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001813 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001814 goto out_pernet;
1815
1816 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1817 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00001818 pr_err("%s: can't register ip4ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001819 goto out_ip4ip6;
1820 }
1821
1822 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1823 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00001824 pr_err("%s: can't register ip6ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001825 goto out_ip6ip6;
1826 }
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001827 err = rtnl_link_register(&ip6_link_ops);
1828 if (err < 0)
1829 goto rtnl_link_failed;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001830
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 return 0;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001832
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001833rtnl_link_failed:
1834 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001835out_ip6ip6:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001836 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001837out_ip4ip6:
1838 unregister_pernet_device(&ip6_tnl_net_ops);
1839out_pernet:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 return err;
1841}
1842
1843/**
1844 * ip6_tunnel_cleanup - free resources and unregister protocol
1845 **/
1846
1847static void __exit ip6_tunnel_cleanup(void)
1848{
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001849 rtnl_link_unregister(&ip6_link_ops);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001850 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Joe Perchesf3213832012-05-15 14:11:53 +00001851 pr_info("%s: can't deregister ip4ip6\n", __func__);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001852
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001853 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Joe Perchesf3213832012-05-15 14:11:53 +00001854 pr_info("%s: can't deregister ip6ip6\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001856 unregister_pernet_device(&ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857}
1858
1859module_init(ip6_tunnel_init);
1860module_exit(ip6_tunnel_cleanup);