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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/net.h>
33#include <linux/in6.h>
34#include <linux/netdevice.h>
35#include <linux/if_arp.h>
36#include <linux/icmpv6.h>
37#include <linux/init.h>
38#include <linux/route.h>
39#include <linux/rtnetlink.h>
40#include <linux/netfilter_ipv6.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090041#include <linux/slab.h>
Eric Dumazetddbe5032012-07-18 08:11:12 +000042#include <linux/hash.h>
Nicolas Dichtele8377352013-08-20 12:16:06 +020043#include <linux/etherdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45#include <asm/uaccess.h>
Arun Sharma600634972011-07-26 16:09:06 -070046#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090048#include <net/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <net/ip.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000050#include <net/ip_tunnels.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <net/ip6_route.h>
53#include <net/addrconf.h>
54#include <net/ip6_tunnel.h>
55#include <net/xfrm.h>
56#include <net/dsfield.h>
57#include <net/inet_ecn.h>
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070058#include <net/net_namespace.h>
59#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61MODULE_AUTHOR("Ville Nuorvala");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090062MODULE_DESCRIPTION("IPv6 tunneling device");
Linus Torvalds1da177e2005-04-16 15:20:36 -070063MODULE_LICENSE("GPL");
stephen hemminger6dfbd872011-03-10 11:43:19 +000064MODULE_ALIAS_NETDEV("ip6tnl0");
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#ifdef IP6_TNL_DEBUG
Joe Perches91df42b2012-05-15 14:11:54 +000067#define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#else
69#define IP6_TNL_TRACE(x...) do {;} while(0)
70#endif
71
Eric Dumazetddbe5032012-07-18 08:11:12 +000072#define HASH_SIZE_SHIFT 5
73#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +000075static bool log_ecn_error = true;
76module_param(log_ecn_error, bool, 0644);
77MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
78
Eric Dumazetddbe5032012-07-18 08:11:12 +000079static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
80{
81 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
82
83 return hash_32(hash, HASH_SIZE_SHIFT);
84}
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Eric Dumazet8560f222010-09-28 03:23:34 +000086static int ip6_tnl_dev_init(struct net_device *dev);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +090087static void ip6_tnl_dev_setup(struct net_device *dev);
Nicolas Dichtelc075b132012-11-09 06:10:01 +000088static struct rtnl_link_ops ip6_link_ops __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Eric Dumazetf99189b2009-11-17 10:42:49 +000090static int ip6_tnl_net_id __read_mostly;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070091struct ip6_tnl_net {
Pavel Emelyanov15820e1292008-04-16 01:23:02 -070092 /* the IPv6 tunnel fallback device */
93 struct net_device *fb_tnl_dev;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -070094 /* lists for storing tunnels in use */
Eric Dumazet94767632010-09-15 20:25:34 +000095 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
96 struct ip6_tnl __rcu *tnls_wc[1];
97 struct ip6_tnl __rcu **tnls[2];
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070098};
99
Eric Dumazet8560f222010-09-28 03:23:34 +0000100static struct net_device_stats *ip6_get_stats(struct net_device *dev)
101{
David S. Miller56a43422014-01-06 17:37:45 -0500102 struct pcpu_sw_netstats tmp, sum = { 0 };
Eric Dumazet8560f222010-09-28 03:23:34 +0000103 int i;
104
105 for_each_possible_cpu(i) {
Li RongQingabb60132014-01-02 13:20:12 +0800106 unsigned int start;
Li RongQing8f849852014-01-04 13:57:59 +0800107 const struct pcpu_sw_netstats *tstats =
108 per_cpu_ptr(dev->tstats, i);
Eric Dumazet8560f222010-09-28 03:23:34 +0000109
Li RongQingabb60132014-01-02 13:20:12 +0800110 do {
Eric W. Biederman57a77442014-03-13 21:26:42 -0700111 start = u64_stats_fetch_begin_irq(&tstats->syncp);
Li RongQingabb60132014-01-02 13:20:12 +0800112 tmp.rx_packets = tstats->rx_packets;
113 tmp.rx_bytes = tstats->rx_bytes;
114 tmp.tx_packets = tstats->tx_packets;
115 tmp.tx_bytes = tstats->tx_bytes;
Eric W. Biederman57a77442014-03-13 21:26:42 -0700116 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
Li RongQingabb60132014-01-02 13:20:12 +0800117
118 sum.rx_packets += tmp.rx_packets;
119 sum.rx_bytes += tmp.rx_bytes;
120 sum.tx_packets += tmp.tx_packets;
121 sum.tx_bytes += tmp.tx_bytes;
Eric Dumazet8560f222010-09-28 03:23:34 +0000122 }
123 dev->stats.rx_packets = sum.rx_packets;
124 dev->stats.rx_bytes = sum.rx_bytes;
125 dev->stats.tx_packets = sum.tx_packets;
126 dev->stats.tx_bytes = sum.tx_bytes;
127 return &dev->stats;
128}
129
Eric Dumazet2922bc82009-10-23 06:34:34 +0000130/*
Eric Dumazet94767632010-09-15 20:25:34 +0000131 * Locking : hash tables are protected by RCU and RTNL
Eric Dumazet2922bc82009-10-23 06:34:34 +0000132 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000134struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
136 struct dst_entry *dst = t->dst_cache;
137
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900138 if (dst && dst->obsolete &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 dst->ops->check(dst, t->dst_cookie) == NULL) {
140 t->dst_cache = NULL;
141 dst_release(dst);
142 return NULL;
143 }
144
145 return dst;
146}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000147EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000149void ip6_tnl_dst_reset(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
151 dst_release(t->dst_cache);
152 t->dst_cache = NULL;
153}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000154EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000156void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
158 struct rt6_info *rt = (struct rt6_info *) dst;
159 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
160 dst_release(t->dst_cache);
161 t->dst_cache = dst;
162}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000163EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900166 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900167 * @remote: the address of the tunnel exit-point
168 * @local: the address of the tunnel entry-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900170 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 * tunnel matching given end-points if found,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900172 * else fallback tunnel if its device is up,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 * else %NULL
174 **/
175
Eric Dumazet2922bc82009-10-23 06:34:34 +0000176#define for_each_ip6_tunnel_rcu(start) \
177 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179static struct ip6_tnl *
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000180ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
Eric Dumazetddbe5032012-07-18 08:11:12 +0000182 unsigned int hash = HASH(remote, local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 struct ip6_tnl *t;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700184 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
Eric Dumazetddbe5032012-07-18 08:11:12 +0000186 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 if (ipv6_addr_equal(local, &t->parms.laddr) &&
188 ipv6_addr_equal(remote, &t->parms.raddr) &&
189 (t->dev->flags & IFF_UP))
190 return t;
191 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000192 t = rcu_dereference(ip6n->tnls_wc[0]);
193 if (t && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 return t;
195
196 return NULL;
197}
198
199/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900200 * ip6_tnl_bucket - get head of list matching given tunnel parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900201 * @p: parameters containing tunnel end-points
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 *
203 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900204 * ip6_tnl_bucket() returns the head of the list matching the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 * &struct in6_addr entries laddr and raddr in @p.
206 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900207 * Return: head of IPv6 tunnel list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 **/
209
Eric Dumazet94767632010-09-15 20:25:34 +0000210static struct ip6_tnl __rcu **
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000211ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000213 const struct in6_addr *remote = &p->raddr;
214 const struct in6_addr *local = &p->laddr;
Eric Dumazet95c96172012-04-15 05:58:06 +0000215 unsigned int h = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 int prio = 0;
217
218 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
219 prio = 1;
Eric Dumazetddbe5032012-07-18 08:11:12 +0000220 h = HASH(remote, local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700222 return &ip6n->tnls[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
224
225/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900226 * ip6_tnl_link - add tunnel to hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 * @t: tunnel to be added
228 **/
229
230static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700231ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
Eric Dumazet94767632010-09-15 20:25:34 +0000233 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Eric Dumazetcf778b02012-01-12 04:41:32 +0000235 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
236 rcu_assign_pointer(*tp, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
239/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900240 * ip6_tnl_unlink - remove tunnel from hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 * @t: tunnel to be removed
242 **/
243
244static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700245ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
Eric Dumazet94767632010-09-15 20:25:34 +0000247 struct ip6_tnl __rcu **tp;
248 struct ip6_tnl *iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Eric Dumazet94767632010-09-15 20:25:34 +0000250 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
251 (iter = rtnl_dereference(*tp)) != NULL;
252 tp = &iter->next) {
253 if (t == iter) {
Eric Dumazetcf778b02012-01-12 04:41:32 +0000254 rcu_assign_pointer(*tp, t->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 break;
256 }
257 }
258}
259
Eric Dumazet8560f222010-09-28 03:23:34 +0000260static void ip6_dev_free(struct net_device *dev)
261{
262 free_percpu(dev->tstats);
263 free_netdev(dev);
264}
265
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000266static int ip6_tnl_create2(struct net_device *dev)
267{
268 struct ip6_tnl *t = netdev_priv(dev);
269 struct net *net = dev_net(dev);
270 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
271 int err;
272
273 t = netdev_priv(dev);
274 err = ip6_tnl_dev_init(dev);
275 if (err < 0)
276 goto out;
277
278 err = register_netdevice(dev);
279 if (err < 0)
280 goto out;
281
282 strcpy(t->parms.name, dev->name);
283 dev->rtnl_link_ops = &ip6_link_ops;
284
285 dev_hold(dev);
286 ip6_tnl_link(ip6n, t);
287 return 0;
288
289out:
290 return err;
291}
292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000294 * ip6_tnl_create - create a new tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 * @p: tunnel parameters
296 * @pt: pointer to new tunnel
297 *
298 * Description:
299 * Create tunnel matching given parameters.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900300 *
301 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800302 * created tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 **/
304
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000305static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
307 struct net_device *dev;
308 struct ip6_tnl *t;
309 char name[IFNAMSIZ];
310 int err;
311
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800312 if (p->name[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 strlcpy(name, p->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800314 else
315 sprintf(name, "ip6tnl%%d");
316
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900317 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 if (dev == NULL)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800319 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Pavel Emelyanov554eb272008-04-16 01:24:13 -0700321 dev_net_set(dev, net);
322
Patrick McHardy2941a482006-01-08 22:05:26 -0800323 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 t->parms = *p;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200325 t->net = dev_net(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000326 err = ip6_tnl_create2(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +0000327 if (err < 0)
328 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Ville Nuorvala567131a2006-11-24 17:05:41 -0800330 return t;
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800331
332failed_free:
Eric Dumazet8560f222010-09-28 03:23:34 +0000333 ip6_dev_free(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800334failed:
335 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336}
337
338/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900339 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900340 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 * @create: != 0 if allowed to create new tunnel if no match found
342 *
343 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900344 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 * based on @parms. If this is unsuccessful, but @create is set a new
346 * tunnel device is created and registered for use.
347 *
348 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800349 * matching tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 **/
351
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700352static struct ip6_tnl *ip6_tnl_locate(struct net *net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000353 struct __ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000355 const struct in6_addr *remote = &p->raddr;
356 const struct in6_addr *local = &p->laddr;
Eric Dumazet94767632010-09-15 20:25:34 +0000357 struct ip6_tnl __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700359 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
Eric Dumazet94767632010-09-15 20:25:34 +0000361 for (tp = ip6_tnl_bucket(ip6n, p);
362 (t = rtnl_dereference(*tp)) != NULL;
363 tp = &t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Ville Nuorvala567131a2006-11-24 17:05:41 -0800365 ipv6_addr_equal(remote, &t->parms.raddr))
366 return t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 }
368 if (!create)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800369 return NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700370 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371}
372
373/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900374 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900376 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900378 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 **/
380
381static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900382ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
Patrick McHardy2941a482006-01-08 22:05:26 -0800384 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200385 struct net *net = t->net;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700386 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Eric Dumazet94767632010-09-15 20:25:34 +0000388 if (dev == ip6n->fb_tnl_dev)
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000389 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
Eric Dumazet94767632010-09-15 20:25:34 +0000390 else
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700391 ip6_tnl_unlink(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 ip6_tnl_dst_reset(t);
393 dev_put(dev);
394}
395
396/**
397 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
398 * @skb: received socket buffer
399 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900400 * Return:
401 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 * else index to encapsulation limit
403 **/
404
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000405__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000407 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 __u8 nexthdr = ipv6h->nexthdr;
409 __u16 off = sizeof (*ipv6h);
410
411 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
412 __u16 optlen = 0;
413 struct ipv6_opt_hdr *hdr;
414 if (raw + off + sizeof (*hdr) > skb->data &&
415 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
416 break;
417
418 hdr = (struct ipv6_opt_hdr *) (raw + off);
419 if (nexthdr == NEXTHDR_FRAGMENT) {
420 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
421 if (frag_hdr->frag_off)
422 break;
423 optlen = 8;
424 } else if (nexthdr == NEXTHDR_AUTH) {
425 optlen = (hdr->hdrlen + 2) << 2;
426 } else {
427 optlen = ipv6_optlen(hdr);
428 }
429 if (nexthdr == NEXTHDR_DEST) {
430 __u16 i = off + 2;
431 while (1) {
432 struct ipv6_tlv_tnl_enc_lim *tel;
433
434 /* No more room for encapsulation limit */
435 if (i + sizeof (*tel) > off + optlen)
436 break;
437
438 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
439 /* return index of option if found and valid */
440 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
441 tel->length == 1)
442 return i;
443 /* else jump to next option */
444 if (tel->type)
445 i += tel->length + 2;
446 else
447 i++;
448 }
449 }
450 nexthdr = hdr->nexthdr;
451 off += optlen;
452 }
453 return 0;
454}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000455EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900458 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 *
460 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900461 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 * to the specifications in RFC 2473.
463 **/
464
Herbert Xud2acc342006-03-28 01:12:13 -0800465static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900466ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700467 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000469 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 struct ip6_tnl *t;
471 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700472 u8 rel_type = ICMPV6_DEST_UNREACH;
473 u8 rel_code = ICMPV6_ADDR_UNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 __u32 rel_info = 0;
475 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800476 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900478 /* If the packet doesn't contain the original IPv6 header we are
479 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 processing of the error. */
481
Eric Dumazet2922bc82009-10-23 06:34:34 +0000482 rcu_read_lock();
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700483 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700484 &ipv6h->saddr)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 goto out;
486
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900487 if (t->parms.proto != ipproto && t->parms.proto != 0)
488 goto out;
489
Herbert Xud2acc342006-03-28 01:12:13 -0800490 err = 0;
491
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900492 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 __u32 teli;
494 struct ipv6_tlv_tnl_enc_lim *tel;
495 __u32 mtu;
496 case ICMPV6_DEST_UNREACH:
Joe Perchese87cc472012-05-13 21:56:26 +0000497 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
498 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 rel_msg = 1;
500 break;
501 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900502 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Joe Perchese87cc472012-05-13 21:56:26 +0000503 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
504 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 rel_msg = 1;
506 }
507 break;
508 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800509 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900510 if ((*code) == ICMPV6_HDR_FIELD)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000511 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
Al Viro704eae12007-07-26 17:33:29 +0100513 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
515 if (tel->encap_limit == 0) {
Joe Perchese87cc472012-05-13 21:56:26 +0000516 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
517 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 rel_msg = 1;
519 }
Joe Perchese87cc472012-05-13 21:56:26 +0000520 } else {
521 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
522 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 }
524 break;
525 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100526 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 if (mtu < IPV6_MIN_MTU)
528 mtu = IPV6_MIN_MTU;
529 t->dev->mtu = mtu;
530
Al Virocc6cdac2006-02-18 16:02:18 -0500531 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 rel_type = ICMPV6_PKT_TOOBIG;
533 rel_code = 0;
534 rel_info = mtu;
535 rel_msg = 1;
536 }
537 break;
538 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900539
540 *type = rel_type;
541 *code = rel_code;
542 *info = rel_info;
543 *msg = rel_msg;
544
545out:
Eric Dumazet2922bc82009-10-23 06:34:34 +0000546 rcu_read_unlock();
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900547 return err;
548}
549
550static int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900551ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700552 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900553{
554 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700555 u8 rel_type = type;
556 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100557 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900558 int err;
559 struct sk_buff *skb2;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000560 const struct iphdr *eiph;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900561 struct rtable *rt;
David S. Miller31e45432011-05-03 20:25:42 -0700562 struct flowi4 fl4;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900563
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900564 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
565 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900566 if (err < 0)
567 return err;
568
569 if (rel_msg == 0)
570 return 0;
571
572 switch (rel_type) {
573 case ICMPV6_DEST_UNREACH:
574 if (rel_code != ICMPV6_ADDR_UNREACH)
575 return 0;
576 rel_type = ICMP_DEST_UNREACH;
577 rel_code = ICMP_HOST_UNREACH;
578 break;
579 case ICMPV6_PKT_TOOBIG:
580 if (rel_code != 0)
581 return 0;
582 rel_type = ICMP_DEST_UNREACH;
583 rel_code = ICMP_FRAG_NEEDED;
584 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700585 case NDISC_REDIRECT:
586 rel_type = ICMP_REDIRECT;
587 rel_code = ICMP_REDIR_HOST;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900588 default:
589 return 0;
590 }
591
592 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
593 return 0;
594
595 skb2 = skb_clone(skb, GFP_ATOMIC);
596 if (!skb2)
597 return 0;
598
Eric Dumazetadf30902009-06-02 05:19:30 +0000599 skb_dst_drop(skb2);
600
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900601 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700602 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700603 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900604
605 /* Try to guess incoming interface */
David S. Miller31e45432011-05-03 20:25:42 -0700606 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500607 eiph->saddr, 0,
608 0, 0,
609 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800610 if (IS_ERR(rt))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900611 goto out;
612
Changli Gaod8d1f302010-06-10 23:31:35 -0700613 skb2->dev = rt->dst.dev;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900614
615 /* route "incoming" packet */
616 if (rt->rt_flags & RTCF_LOCAL) {
617 ip_rt_put(rt);
618 rt = NULL;
David S. Miller31e45432011-05-03 20:25:42 -0700619 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500620 eiph->daddr, eiph->saddr,
621 0, 0,
622 IPPROTO_IPIP,
623 RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800624 if (IS_ERR(rt) ||
Changli Gaod8d1f302010-06-10 23:31:35 -0700625 rt->dst.dev->type != ARPHRD_TUNNEL) {
David S. Millerb23dd4f2011-03-02 14:31:35 -0800626 if (!IS_ERR(rt))
627 ip_rt_put(rt);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900628 goto out;
629 }
David S. Millerb23dd4f2011-03-02 14:31:35 -0800630 skb_dst_set(skb2, &rt->dst);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900631 } else {
632 ip_rt_put(rt);
633 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
634 skb2->dev) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000635 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900636 goto out;
637 }
638
639 /* change mtu on this route */
640 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000641 if (rel_info > dst_mtu(skb_dst(skb2)))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900642 goto out;
643
David S. Miller6700c272012-07-17 03:29:28 -0700644 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900645 }
David S. Miller1ed5c482012-07-12 00:41:25 -0700646 if (rel_type == ICMP_REDIRECT)
David S. Miller6700c272012-07-17 03:29:28 -0700647 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900648
Al Viro704eae12007-07-26 17:33:29 +0100649 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900650
651out:
652 kfree_skb(skb2);
653 return 0;
654}
655
656static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900657ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700658 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900659{
660 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700661 u8 rel_type = type;
662 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100663 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900664 int err;
665
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900666 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
667 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900668 if (err < 0)
669 return err;
670
671 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 struct rt6_info *rt;
673 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900676 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
Eric Dumazetadf30902009-06-02 05:19:30 +0000678 skb_dst_drop(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700680 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
682 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700683 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
684 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
David S. Millerd1918542011-12-28 20:19:20 -0500686 if (rt && rt->dst.dev)
687 skb2->dev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000689 icmpv6_send(skb2, rel_type, rel_code, rel_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Amerigo Wang94e187c2012-10-29 00:13:19 +0000691 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
693 kfree_skb(skb2);
694 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900695
696 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697}
698
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000699static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
700 const struct ipv6hdr *ipv6h,
701 struct sk_buff *skb)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900702{
703 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
704
705 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700706 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900707
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000708 return IP6_ECN_decapsulate(ipv6h, skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900709}
710
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000711static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
712 const struct ipv6hdr *ipv6h,
713 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900715 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b42007-11-13 21:40:13 -0800716 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000718 return IP6_ECN_decapsulate(ipv6h, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900720
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000721__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000722 const struct in6_addr *laddr,
723 const struct in6_addr *raddr)
724{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000725 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000726 int ltype = ipv6_addr_type(laddr);
727 int rtype = ipv6_addr_type(raddr);
728 __u32 flags = 0;
729
730 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
731 flags = IP6_TNL_F_CAP_PER_PACKET;
732 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
733 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
734 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
735 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
736 if (ltype&IPV6_ADDR_UNICAST)
737 flags |= IP6_TNL_F_CAP_XMIT;
738 if (rtype&IPV6_ADDR_UNICAST)
739 flags |= IP6_TNL_F_CAP_RCV;
740 }
741 return flags;
742}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000743EXPORT_SYMBOL(ip6_tnl_get_cap);
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000744
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100745/* called with rcu_read_lock() */
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000746int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000747 const struct in6_addr *laddr,
748 const struct in6_addr *raddr)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800749{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000750 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800751 int ret = 0;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200752 struct net *net = t->net;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800753
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000754 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
755 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
756 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900757 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800758
759 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100760 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800761
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000762 if ((ipv6_addr_is_multicast(laddr) ||
763 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
764 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800765 ret = 1;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800766 }
767 return ret;
768}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000769EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
771/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900772 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 * @skb: received socket buffer
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900774 * @protocol: ethernet protocol ID
775 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 *
777 * Return: 0
778 **/
779
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900780static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900781 __u8 ipproto,
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000782 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
783 const struct ipv6hdr *ipv6h,
784 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 struct ip6_tnl *t;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000787 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000788 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
Eric Dumazet2922bc82009-10-23 06:34:34 +0000790 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700792 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700793 &ipv6h->daddr)) != NULL) {
Li RongQing8f849852014-01-04 13:57:59 +0800794 struct pcpu_sw_netstats *tstats;
Eric Dumazet8560f222010-09-28 03:23:34 +0000795
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900796 if (t->parms.proto != ipproto && t->parms.proto != 0) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000797 rcu_read_unlock();
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900798 goto discard;
799 }
800
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000802 rcu_read_unlock();
Herbert Xu50fba2a2006-04-04 13:50:45 -0700803 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 }
805
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000806 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700807 t->dev->stats.rx_dropped++;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000808 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 goto discard;
810 }
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700811 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700812 skb_reset_network_header(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900813 skb->protocol = htons(protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700815
Nicolas Dichtelea231922013-09-02 15:34:58 +0200816 __skb_tunnel_rx(skb, t->dev, t->net);
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000817
818 err = dscp_ecn_decapsulate(t, ipv6h, skb);
819 if (unlikely(err)) {
820 if (log_ecn_error)
821 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
822 &ipv6h->saddr,
823 ipv6_get_dsfield(ipv6h));
824 if (err > 1) {
825 ++t->dev->stats.rx_frame_errors;
826 ++t->dev->stats.rx_errors;
827 rcu_read_unlock();
828 goto discard;
829 }
830 }
831
Eric Dumazet8560f222010-09-28 03:23:34 +0000832 tstats = this_cpu_ptr(t->dev->tstats);
Li RongQingabb60132014-01-02 13:20:12 +0800833 u64_stats_update_begin(&tstats->syncp);
Eric Dumazet8560f222010-09-28 03:23:34 +0000834 tstats->rx_packets++;
835 tstats->rx_bytes += skb->len;
Li RongQingabb60132014-01-02 13:20:12 +0800836 u64_stats_update_end(&tstats->syncp);
Eric Dumazet8560f222010-09-28 03:23:34 +0000837
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000838 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000839
Eric Dumazet2922bc82009-10-23 06:34:34 +0000840 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 return 0;
842 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000843 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 return 1;
Herbert Xu50fba2a2006-04-04 13:50:45 -0700845
846discard:
847 kfree_skb(skb);
848 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849}
850
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900851static int ip4ip6_rcv(struct sk_buff *skb)
852{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900853 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
854 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900855}
856
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900857static int ip6ip6_rcv(struct sk_buff *skb)
858{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900859 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
860 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900861}
862
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800863struct ipv6_tel_txoption {
864 struct ipv6_txoptions ops;
865 __u8 dst_opt[8];
866};
867
868static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800870 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800872 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
873 opt->dst_opt[3] = 1;
874 opt->dst_opt[4] = encap_limit;
875 opt->dst_opt[5] = IPV6_TLV_PADN;
876 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800878 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
879 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880}
881
882/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900883 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900885 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 *
887 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900888 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 * doesn't match source of incoming packet.
890 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900891 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 * 1 if conflict,
893 * 0 else
894 **/
895
Eric Dumazet92113bf2012-05-18 08:14:11 +0200896static inline bool
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000897ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898{
899 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
900}
901
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000902int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800903{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000904 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800905 int ret = 0;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200906 struct net *net = t->net;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800907
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900908 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800909 struct net_device *ldev = NULL;
910
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100911 rcu_read_lock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800912 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100913 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800914
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700915 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000916 pr_warn("%s xmit: Local address not yet configured!\n",
917 p->name);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800918 else if (!ipv6_addr_is_multicast(&p->raddr) &&
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700919 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000920 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
921 p->name);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800922 else
923 ret = 1;
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100924 rcu_read_unlock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800925 }
926 return ret;
927}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000928EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
929
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930/**
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900931 * ip6_tnl_xmit2 - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900933 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900934 * @dsfield: dscp code for outer header
935 * @fl: flow of tunneled packet
936 * @encap_limit: encapsulation limit
937 * @pmtu: Path MTU is stored if packet is too big
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 *
939 * Description:
940 * Build new header and do some sanity checks on the packet before sending
941 * it.
942 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900943 * Return:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900944 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900945 * -1 fail
946 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 **/
948
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900949static int ip6_tnl_xmit2(struct sk_buff *skb,
950 struct net_device *dev,
951 __u8 dsfield,
David S. Miller4c9483b2011-03-12 16:22:43 -0500952 struct flowi6 *fl6,
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900953 int encap_limit,
954 __u32 *pmtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955{
Patrick McHardy2941a482006-01-08 22:05:26 -0800956 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200957 struct net *net = t->net;
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700958 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700959 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800960 struct ipv6_tel_txoption opt;
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400961 struct dst_entry *dst = NULL, *ndst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 struct net_device *tdev;
963 int mtu;
Chuck Leverc2636b42007-10-23 21:07:32 -0700964 unsigned int max_headroom = sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 u8 proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900966 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400968 if (!fl6->flowi6_mark)
969 dst = ip6_tnl_dst_check(t);
Eric Dumazet89b02122011-07-28 04:32:25 +0000970 if (!dst) {
971 ndst = ip6_route_output(net, NULL, fl6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972
Eric Dumazet89b02122011-07-28 04:32:25 +0000973 if (ndst->error)
Patrick McHardya57ebc92005-09-08 14:27:47 -0700974 goto tx_err_link_failure;
Eric Dumazet89b02122011-07-28 04:32:25 +0000975 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
976 if (IS_ERR(ndst)) {
977 err = PTR_ERR(ndst);
978 ndst = NULL;
David S. Miller452edd52011-03-02 13:27:41 -0800979 goto tx_err_link_failure;
980 }
Eric Dumazet89b02122011-07-28 04:32:25 +0000981 dst = ndst;
Patrick McHardya57ebc92005-09-08 14:27:47 -0700982 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983
984 tdev = dst->dev;
985
986 if (tdev == dev) {
987 stats->collisions++;
Joe Perchese87cc472012-05-13 21:56:26 +0000988 net_warn_ratelimited("%s: Local routing loop detected!\n",
989 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 goto tx_err_dst_release;
991 }
992 mtu = dst_mtu(dst) - sizeof (*ipv6h);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800993 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 max_headroom += 8;
995 mtu -= 8;
996 }
997 if (mtu < IPV6_MIN_MTU)
998 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +0000999 if (skb_dst(skb))
David S. Miller6700c272012-07-17 03:29:28 -07001000 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 if (skb->len > mtu) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001002 *pmtu = mtu;
1003 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 goto tx_err_dst_release;
1005 }
1006
Nicolas Dichtel963a88b2013-09-02 15:34:57 +02001007 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001008
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 /*
1010 * Okay, now see if we can stuff it in the buffer as-is.
1011 */
1012 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001013
Patrick McHardycfbba492007-07-09 15:33:40 -07001014 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1015 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001017
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
1019 goto tx_err_dst_release;
1020
1021 if (skb->sk)
1022 skb_set_owner_w(new_skb, skb->sk);
Eric Dumazet9ff26442012-04-19 02:24:17 +00001023 consume_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 skb = new_skb;
1025 }
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001026 if (fl6->flowi6_mark) {
1027 skb_dst_set(skb, dst);
1028 ndst = NULL;
1029 } else {
1030 skb_dst_set_noref(skb, dst);
1031 }
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07001032 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
David S. Miller4c9483b2011-03-12 16:22:43 -05001034 proto = fl6->flowi6_proto;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -08001035 if (encap_limit >= 0) {
1036 init_tel_txopt(&opt, encap_limit);
1037 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1038 }
Hannes Frederic Sowa3d483052013-08-18 13:46:52 +02001039
1040 if (likely(!skb->encapsulation)) {
1041 skb_reset_inner_headers(skb);
1042 skb->encapsulation = 1;
1043 }
1044
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -07001045 skb_push(skb, sizeof(struct ipv6hdr));
1046 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001047 ipv6h = ipv6_hdr(skb);
YOSHIFUJI Hideaki / 吉藤英明3e4e4c12013-01-13 05:01:39 +00001048 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 ipv6h->hop_limit = t->parms.hop_limit;
1050 ipv6h->nexthdr = proto;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001051 ipv6h->saddr = fl6->saddr;
1052 ipv6h->daddr = fl6->daddr;
Cong Wange8f72ea2013-03-09 23:00:39 +00001053 ip6tunnel_xmit(skb, dev);
Eric Dumazet89b02122011-07-28 04:32:25 +00001054 if (ndst)
1055 ip6_tnl_dst_store(t, ndst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 return 0;
1057tx_err_link_failure:
1058 stats->tx_carrier_errors++;
1059 dst_link_failure(skb);
1060tx_err_dst_release:
Eric Dumazet89b02122011-07-28 04:32:25 +00001061 dst_release(ndst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001062 return err;
1063}
1064
1065static inline int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001066ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1067{
1068 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001069 const struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001070 int encap_limit = -1;
David S. Miller4c9483b2011-03-12 16:22:43 -05001071 struct flowi6 fl6;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001072 __u8 dsfield;
1073 __u32 mtu;
1074 int err;
1075
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001076 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1077 !ip6_tnl_xmit_ctl(t))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001078 return -1;
1079
1080 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1081 encap_limit = t->parms.encap_limit;
1082
David S. Miller4c9483b2011-03-12 16:22:43 -05001083 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1084 fl6.flowi6_proto = IPPROTO_IPIP;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001085
1086 dsfield = ipv4_get_dsfield(iph);
1087
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001088 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001089 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
Al Virob77f2fa2007-07-21 19:09:41 -07001090 & IPV6_TCLASS_MASK;
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001091 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1092 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001093
David S. Miller4c9483b2011-03-12 16:22:43 -05001094 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001095 if (err != 0) {
1096 /* XXX: send ICMP error even if DF is not set. */
1097 if (err == -EMSGSIZE)
1098 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1099 htonl(mtu));
1100 return -1;
1101 }
1102
1103 return 0;
1104}
1105
1106static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001107ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1108{
1109 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001110 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001111 int encap_limit = -1;
1112 __u16 offset;
David S. Miller4c9483b2011-03-12 16:22:43 -05001113 struct flowi6 fl6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001114 __u8 dsfield;
1115 __u32 mtu;
1116 int err;
1117
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001118 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1119 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001120 return -1;
1121
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001122 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001123 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001124 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001125 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001126 if (tel->encap_limit == 0) {
1127 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001128 ICMPV6_HDR_FIELD, offset + 2);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001129 return -1;
1130 }
1131 encap_limit = tel->encap_limit - 1;
1132 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1133 encap_limit = t->parms.encap_limit;
1134
David S. Miller4c9483b2011-03-12 16:22:43 -05001135 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1136 fl6.flowi6_proto = IPPROTO_IPV6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001137
1138 dsfield = ipv6_get_dsfield(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001139 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001140 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001141 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
Florent Fourcot3308de22013-12-08 15:47:00 +01001142 fl6.flowlabel |= ip6_flowlabel(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001143 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1144 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001145
David S. Miller4c9483b2011-03-12 16:22:43 -05001146 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001147 if (err != 0) {
1148 if (err == -EMSGSIZE)
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001149 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001150 return -1;
1151 }
1152
1153 return 0;
1154}
1155
Stephen Hemminger6fef4c02009-08-31 19:50:41 +00001156static netdev_tx_t
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001157ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1158{
1159 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001160 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001161 int ret;
1162
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001163 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001164 case htons(ETH_P_IP):
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001165 ret = ip4ip6_tnl_xmit(skb, dev);
1166 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001167 case htons(ETH_P_IPV6):
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001168 ret = ip6ip6_tnl_xmit(skb, dev);
1169 break;
1170 default:
1171 goto tx_err;
1172 }
1173
1174 if (ret < 0)
1175 goto tx_err;
1176
Patrick McHardy6ed10652009-06-23 06:03:08 +00001177 return NETDEV_TX_OK;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001178
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179tx_err:
1180 stats->tx_errors++;
1181 stats->tx_dropped++;
1182 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +00001183 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184}
1185
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001186static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187{
1188 struct net_device *dev = t->dev;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001189 struct __ip6_tnl_parm *p = &t->parms;
David S. Miller4c9483b2011-03-12 16:22:43 -05001190 struct flowi6 *fl6 = &t->fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
Jiri Pirko3a6d54c2009-05-11 23:37:15 +00001192 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1193 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
1195 /* Set up flowi template */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001196 fl6->saddr = p->laddr;
1197 fl6->daddr = p->raddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001198 fl6->flowi6_oif = p->link;
1199 fl6->flowlabel = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200
1201 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001202 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001204 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001206 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1207 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208
1209 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1210 dev->flags |= IFF_POINTOPOINT;
1211 else
1212 dev->flags &= ~IFF_POINTOPOINT;
1213
1214 dev->iflink = p->link;
1215
1216 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001217 int strict = (ipv6_addr_type(&p->raddr) &
1218 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1219
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001220 struct rt6_info *rt = rt6_lookup(t->net,
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001221 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001222 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223
1224 if (rt == NULL)
1225 return;
1226
David S. Millerd1918542011-12-28 20:19:20 -05001227 if (rt->dst.dev) {
1228 dev->hard_header_len = rt->dst.dev->hard_header_len +
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 sizeof (struct ipv6hdr);
1230
David S. Millerd1918542011-12-28 20:19:20 -05001231 dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001232 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1233 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234
1235 if (dev->mtu < IPV6_MIN_MTU)
1236 dev->mtu = IPV6_MIN_MTU;
1237 }
Amerigo Wang94e187c2012-10-29 00:13:19 +00001238 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 }
1240}
1241
1242/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001243 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 * @t: tunnel to be changed
1245 * @p: tunnel configuration parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 *
1247 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001248 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 **/
1250
1251static int
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001252ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253{
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001254 t->parms.laddr = p->laddr;
1255 t->parms.raddr = p->raddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 t->parms.flags = p->flags;
1257 t->parms.hop_limit = p->hop_limit;
1258 t->parms.encap_limit = p->encap_limit;
1259 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001260 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001261 t->parms.proto = p->proto;
Hugo Santos0c088892006-02-24 13:16:25 -08001262 ip6_tnl_dst_reset(t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001263 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 return 0;
1265}
1266
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001267static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1268{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001269 struct net *net = t->net;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001270 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1271 int err;
1272
1273 ip6_tnl_unlink(ip6n, t);
1274 synchronize_net();
1275 err = ip6_tnl_change(t, p);
1276 ip6_tnl_link(ip6n, t);
1277 netdev_state_change(t->dev);
1278 return err;
1279}
1280
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001281static void
1282ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1283{
1284 p->laddr = u->laddr;
1285 p->raddr = u->raddr;
1286 p->flags = u->flags;
1287 p->hop_limit = u->hop_limit;
1288 p->encap_limit = u->encap_limit;
1289 p->flowinfo = u->flowinfo;
1290 p->link = u->link;
1291 p->proto = u->proto;
1292 memcpy(p->name, u->name, sizeof(u->name));
1293}
1294
1295static void
1296ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1297{
1298 u->laddr = p->laddr;
1299 u->raddr = p->raddr;
1300 u->flags = p->flags;
1301 u->hop_limit = p->hop_limit;
1302 u->encap_limit = p->encap_limit;
1303 u->flowinfo = p->flowinfo;
1304 u->link = p->link;
1305 u->proto = p->proto;
1306 memcpy(u->name, p->name, sizeof(u->name));
1307}
1308
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001310 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 * @dev: virtual device associated with tunnel
1312 * @ifr: parameters passed from userspace
1313 * @cmd: command to be performed
1314 *
1315 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001316 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001317 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 *
1319 * The possible commands are the following:
1320 * %SIOCGETTUNNEL: get tunnel parameters for device
1321 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1322 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1323 * %SIOCDELTUNNEL: delete tunnel
1324 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001325 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 * initialization, can be used for creating other tunnel devices.
1327 *
1328 * Return:
1329 * 0 on success,
1330 * %-EFAULT if unable to copy data to or from userspace,
1331 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1332 * %-EINVAL if passed tunnel parameters are invalid,
1333 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1334 * %-ENODEV if attempting to change or delete a nonexisting device
1335 **/
1336
1337static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001338ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339{
1340 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 struct ip6_tnl_parm p;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001342 struct __ip6_tnl_parm p1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 struct ip6_tnl *t = NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001344 struct net *net = dev_net(dev);
1345 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346
1347 switch (cmd) {
1348 case SIOCGETTUNNEL:
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001349 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001350 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 err = -EFAULT;
1352 break;
1353 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001354 ip6_tnl_parm_from_user(&p1, &p);
1355 t = ip6_tnl_locate(net, &p1, 0);
Dan Carpenter5ef5d6c2012-08-16 03:14:04 +00001356 } else {
1357 memset(&p, 0, sizeof(p));
Ville Nuorvala567131a2006-11-24 17:05:41 -08001358 }
1359 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -08001360 t = netdev_priv(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001361 ip6_tnl_parm_to_user(&p, &t->parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1363 err = -EFAULT;
1364 }
1365 break;
1366 case SIOCADDTUNNEL:
1367 case SIOCCHGTUNNEL:
1368 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001369 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001371 err = -EFAULT;
1372 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001374 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001375 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1376 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 break;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001378 ip6_tnl_parm_from_user(&p1, &p);
1379 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001380 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001381 if (t != NULL) {
1382 if (t->dev != dev) {
1383 err = -EEXIST;
1384 break;
1385 }
1386 } else
1387 t = netdev_priv(dev);
1388
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001389 err = ip6_tnl_update(t, &p1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 }
Ville Nuorvala567131a2006-11-24 17:05:41 -08001391 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 err = 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001393 ip6_tnl_parm_to_user(&p, &t->parms);
1394 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
Ville Nuorvala567131a2006-11-24 17:05:41 -08001395 err = -EFAULT;
1396
1397 } else
1398 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 break;
1400 case SIOCDELTUNNEL:
1401 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001402 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 break;
1404
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001405 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001406 err = -EFAULT;
1407 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001409 err = -ENOENT;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001410 ip6_tnl_parm_from_user(&p1, &p);
1411 t = ip6_tnl_locate(net, &p1, 0);
1412 if (t == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001414 err = -EPERM;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001415 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001417 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001419 err = 0;
1420 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421 break;
1422 default:
1423 err = -EINVAL;
1424 }
1425 return err;
1426}
1427
1428/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001429 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 * @dev: virtual device associated with tunnel
1431 * @new_mtu: the new mtu
1432 *
1433 * Return:
1434 * 0 on success,
1435 * %-EINVAL if mtu too small
1436 **/
1437
1438static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001439ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440{
Oussama Ghorbel582442d2013-10-03 14:49:26 +01001441 struct ip6_tnl *tnl = netdev_priv(dev);
1442
1443 if (tnl->parms.proto == IPPROTO_IPIP) {
1444 if (new_mtu < 68)
1445 return -EINVAL;
1446 } else {
1447 if (new_mtu < IPV6_MIN_MTU)
1448 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 }
Oussama Ghorbel582442d2013-10-03 14:49:26 +01001450 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1451 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 dev->mtu = new_mtu;
1453 return 0;
1454}
1455
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001456
1457static const struct net_device_ops ip6_tnl_netdev_ops = {
Eric Dumazet8560f222010-09-28 03:23:34 +00001458 .ndo_uninit = ip6_tnl_dev_uninit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001459 .ndo_start_xmit = ip6_tnl_xmit,
Eric Dumazet8560f222010-09-28 03:23:34 +00001460 .ndo_do_ioctl = ip6_tnl_ioctl,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001461 .ndo_change_mtu = ip6_tnl_change_mtu,
Eric Dumazet8560f222010-09-28 03:23:34 +00001462 .ndo_get_stats = ip6_get_stats,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001463};
1464
Eric Dumazet8560f222010-09-28 03:23:34 +00001465
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001467 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 * @dev: virtual device associated with tunnel
1469 *
1470 * Description:
1471 * Initialize function pointers and device parameters
1472 **/
1473
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001474static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475{
Anders Franzen381601e2010-11-24 05:47:18 +00001476 struct ip6_tnl *t;
1477
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001478 dev->netdev_ops = &ip6_tnl_netdev_ops;
Eric Dumazet8560f222010-09-28 03:23:34 +00001479 dev->destructor = ip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
1481 dev->type = ARPHRD_TUNNEL6;
1482 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1483 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001484 t = netdev_priv(dev);
1485 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1486 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 dev->flags |= IFF_NOARP;
1488 dev->addr_len = sizeof(struct in6_addr);
Anders Franzen7e223de2010-10-19 03:50:47 +00001489 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Nicolas Dichtele8377352013-08-20 12:16:06 +02001490 /* This perm addr will be used as interface identifier by IPv6 */
1491 dev->addr_assign_type = NET_ADDR_RANDOM;
1492 eth_random_addr(dev->perm_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493}
1494
1495
1496/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001497 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 * @dev: virtual device associated with tunnel
1499 **/
1500
Eric Dumazet8560f222010-09-28 03:23:34 +00001501static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001502ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503{
Patrick McHardy2941a482006-01-08 22:05:26 -08001504 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001505
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 t->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001507 t->net = dev_net(dev);
WANG Cong1c213bd2014-02-13 11:46:28 -08001508 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Eric Dumazet8560f222010-09-28 03:23:34 +00001509 if (!dev->tstats)
1510 return -ENOMEM;
1511 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512}
1513
1514/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001515 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 * @dev: virtual device associated with tunnel
1517 **/
1518
Eric Dumazet8560f222010-09-28 03:23:34 +00001519static int ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520{
Patrick McHardy2941a482006-01-08 22:05:26 -08001521 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001522 int err = ip6_tnl_dev_init_gen(dev);
1523
1524 if (err)
1525 return err;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001526 ip6_tnl_link_config(t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001527 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528}
1529
1530/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001531 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 * @dev: fallback device
1533 *
1534 * Return: 0
1535 **/
1536
Eric Dumazet8560f222010-09-28 03:23:34 +00001537static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538{
Patrick McHardy2941a482006-01-08 22:05:26 -08001539 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001540 struct net *net = dev_net(dev);
1541 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Eric Dumazet8560f222010-09-28 03:23:34 +00001542 int err = ip6_tnl_dev_init_gen(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001543
Eric Dumazet8560f222010-09-28 03:23:34 +00001544 if (err)
1545 return err;
1546
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001547 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 dev_hold(dev);
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001549
1550 ip6_tnl_link_config(t);
1551
Eric Dumazetcf778b02012-01-12 04:41:32 +00001552 rcu_assign_pointer(ip6n->tnls_wc[0], t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001553 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554}
1555
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001556static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1557{
1558 u8 proto;
1559
1560 if (!data)
1561 return 0;
1562
1563 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1564 if (proto != IPPROTO_IPV6 &&
1565 proto != IPPROTO_IPIP &&
1566 proto != 0)
1567 return -EINVAL;
1568
1569 return 0;
1570}
1571
1572static void ip6_tnl_netlink_parms(struct nlattr *data[],
1573 struct __ip6_tnl_parm *parms)
1574{
1575 memset(parms, 0, sizeof(*parms));
1576
1577 if (!data)
1578 return;
1579
1580 if (data[IFLA_IPTUN_LINK])
1581 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1582
1583 if (data[IFLA_IPTUN_LOCAL])
1584 nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],
1585 sizeof(struct in6_addr));
1586
1587 if (data[IFLA_IPTUN_REMOTE])
1588 nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],
1589 sizeof(struct in6_addr));
1590
1591 if (data[IFLA_IPTUN_TTL])
1592 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1593
1594 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1595 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1596
1597 if (data[IFLA_IPTUN_FLOWINFO])
Nicolas Dichtel1ff05fb2012-11-15 04:06:42 +00001598 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001599
1600 if (data[IFLA_IPTUN_FLAGS])
1601 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1602
1603 if (data[IFLA_IPTUN_PROTO])
1604 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1605}
1606
1607static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1608 struct nlattr *tb[], struct nlattr *data[])
1609{
1610 struct net *net = dev_net(dev);
1611 struct ip6_tnl *nt;
1612
1613 nt = netdev_priv(dev);
1614 ip6_tnl_netlink_parms(data, &nt->parms);
1615
1616 if (ip6_tnl_locate(net, &nt->parms, 0))
1617 return -EEXIST;
1618
1619 return ip6_tnl_create2(dev);
1620}
1621
1622static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1623 struct nlattr *data[])
1624{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001625 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001626 struct __ip6_tnl_parm p;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001627 struct net *net = t->net;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001628 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1629
1630 if (dev == ip6n->fb_tnl_dev)
1631 return -EINVAL;
1632
1633 ip6_tnl_netlink_parms(data, &p);
1634
1635 t = ip6_tnl_locate(net, &p, 0);
1636
1637 if (t) {
1638 if (t->dev != dev)
1639 return -EEXIST;
1640 } else
1641 t = netdev_priv(dev);
1642
1643 return ip6_tnl_update(t, &p);
1644}
1645
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001646static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1647{
1648 struct net *net = dev_net(dev);
1649 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1650
1651 if (dev != ip6n->fb_tnl_dev)
1652 unregister_netdevice_queue(dev, head);
1653}
1654
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001655static size_t ip6_tnl_get_size(const struct net_device *dev)
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001656{
1657 return
1658 /* IFLA_IPTUN_LINK */
1659 nla_total_size(4) +
1660 /* IFLA_IPTUN_LOCAL */
1661 nla_total_size(sizeof(struct in6_addr)) +
1662 /* IFLA_IPTUN_REMOTE */
1663 nla_total_size(sizeof(struct in6_addr)) +
1664 /* IFLA_IPTUN_TTL */
1665 nla_total_size(1) +
1666 /* IFLA_IPTUN_ENCAP_LIMIT */
1667 nla_total_size(1) +
1668 /* IFLA_IPTUN_FLOWINFO */
1669 nla_total_size(4) +
1670 /* IFLA_IPTUN_FLAGS */
1671 nla_total_size(4) +
Nicolas Dichtelcfa323b2012-11-14 05:13:58 +00001672 /* IFLA_IPTUN_PROTO */
1673 nla_total_size(1) +
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001674 0;
1675}
1676
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001677static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001678{
1679 struct ip6_tnl *tunnel = netdev_priv(dev);
1680 struct __ip6_tnl_parm *parm = &tunnel->parms;
1681
1682 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1683 nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001684 &parm->laddr) ||
Ding Zhi0d2ede92013-09-16 11:31:15 +02001685 nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
1686 &parm->raddr) ||
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001687 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1688 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1689 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
Nicolas Dichtelcfa323b2012-11-14 05:13:58 +00001690 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1691 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001692 goto nla_put_failure;
1693 return 0;
1694
1695nla_put_failure:
1696 return -EMSGSIZE;
1697}
1698
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001699static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1700 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1701 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1702 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1703 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1704 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1705 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1706 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1707 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1708};
1709
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001710static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1711 .kind = "ip6tnl",
1712 .maxtype = IFLA_IPTUN_MAX,
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001713 .policy = ip6_tnl_policy,
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001714 .priv_size = sizeof(struct ip6_tnl),
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001715 .setup = ip6_tnl_dev_setup,
1716 .validate = ip6_tnl_validate,
1717 .newlink = ip6_tnl_newlink,
1718 .changelink = ip6_tnl_changelink,
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001719 .dellink = ip6_tnl_dellink,
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001720 .get_size = ip6_tnl_get_size,
1721 .fill_info = ip6_tnl_fill_info,
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001722};
1723
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001724static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001725 .handler = ip4ip6_rcv,
1726 .err_handler = ip4ip6_err,
1727 .priority = 1,
1728};
1729
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001730static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
Patrick McHardy03037702005-07-19 14:03:34 -07001731 .handler = ip6ip6_rcv,
1732 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08001733 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734};
1735
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001736static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001737{
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001738 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001739 struct net_device *dev, *aux;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001740 int h;
1741 struct ip6_tnl *t;
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001742 LIST_HEAD(list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001743
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001744 for_each_netdev_safe(net, dev, aux)
1745 if (dev->rtnl_link_ops == &ip6_link_ops)
1746 unregister_netdevice_queue(dev, &list);
1747
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001748 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet94767632010-09-15 20:25:34 +00001749 t = rtnl_dereference(ip6n->tnls_r_l[h]);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001750 while (t != NULL) {
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001751 /* If dev is in the same netns, it has already
1752 * been added to the list by the previous loop.
1753 */
1754 if (!net_eq(dev_net(t->dev), net))
1755 unregister_netdevice_queue(t->dev, &list);
Eric Dumazet94767632010-09-15 20:25:34 +00001756 t = rtnl_dereference(t->next);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001757 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001758 }
1759
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001760 unregister_netdevice_many(&list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001761}
1762
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001763static int __net_init ip6_tnl_init_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001764{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001765 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Josh Boyer731abb92011-11-10 15:10:23 +00001766 struct ip6_tnl *t = NULL;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001767 int err;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001768
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001769 ip6n->tnls[0] = ip6n->tnls_wc;
1770 ip6n->tnls[1] = ip6n->tnls_r_l;
1771
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001772 err = -ENOMEM;
1773 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1774 ip6_tnl_dev_setup);
1775
1776 if (!ip6n->fb_tnl_dev)
1777 goto err_alloc_dev;
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001778 dev_net_set(ip6n->fb_tnl_dev, net);
Nicolas Dichtelbb814092013-10-01 18:05:00 +02001779 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001780 /* FB netdevice is special: we have one, and only one per netns.
1781 * Allowing to move it to another netns is clearly unsafe.
1782 */
1783 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001784
Eric Dumazet8560f222010-09-28 03:23:34 +00001785 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1786 if (err < 0)
1787 goto err_register;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001788
1789 err = register_netdev(ip6n->fb_tnl_dev);
1790 if (err < 0)
1791 goto err_register;
Josh Boyer731abb92011-11-10 15:10:23 +00001792
1793 t = netdev_priv(ip6n->fb_tnl_dev);
1794
1795 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001796 return 0;
1797
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001798err_register:
Eric Dumazet8560f222010-09-28 03:23:34 +00001799 ip6_dev_free(ip6n->fb_tnl_dev);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001800err_alloc_dev:
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001801 return err;
1802}
1803
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001804static void __net_exit ip6_tnl_exit_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001805{
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001806 rtnl_lock();
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001807 ip6_tnl_destroy_tunnels(net);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001808 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001809}
1810
1811static struct pernet_operations ip6_tnl_net_ops = {
1812 .init = ip6_tnl_init_net,
1813 .exit = ip6_tnl_exit_net,
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001814 .id = &ip6_tnl_net_id,
1815 .size = sizeof(struct ip6_tnl_net),
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001816};
1817
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818/**
1819 * ip6_tunnel_init - register protocol and reserve needed resources
1820 *
1821 * Return: 0 on success
1822 **/
1823
1824static int __init ip6_tunnel_init(void)
1825{
1826 int err;
1827
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001828 err = register_pernet_device(&ip6_tnl_net_ops);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001829 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001830 goto out_pernet;
1831
1832 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1833 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00001834 pr_err("%s: can't register ip4ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001835 goto out_ip4ip6;
1836 }
1837
1838 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1839 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00001840 pr_err("%s: can't register ip6ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001841 goto out_ip6ip6;
1842 }
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001843 err = rtnl_link_register(&ip6_link_ops);
1844 if (err < 0)
1845 goto rtnl_link_failed;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001846
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 return 0;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001848
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001849rtnl_link_failed:
1850 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001851out_ip6ip6:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001852 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001853out_ip4ip6:
1854 unregister_pernet_device(&ip6_tnl_net_ops);
1855out_pernet:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 return err;
1857}
1858
1859/**
1860 * ip6_tunnel_cleanup - free resources and unregister protocol
1861 **/
1862
1863static void __exit ip6_tunnel_cleanup(void)
1864{
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001865 rtnl_link_unregister(&ip6_link_ops);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001866 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Joe Perchesf3213832012-05-15 14:11:53 +00001867 pr_info("%s: can't deregister ip4ip6\n", __func__);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001868
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001869 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Joe Perchesf3213832012-05-15 14:11:53 +00001870 pr_info("%s: can't deregister ip6ip6\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001872 unregister_pernet_device(&ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873}
1874
1875module_init(ip6_tunnel_init);
1876module_exit(ip6_tunnel_cleanup);