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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");
Tom Gundersenf98f89a2014-05-15 23:21:30 +020064MODULE_ALIAS_RTNL_LINK("ip6tnl");
stephen hemminger6dfbd872011-03-10 11:43:19 +000065MODULE_ALIAS_NETDEV("ip6tnl0");
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Eric Dumazetddbe5032012-07-18 08:11:12 +000067#define HASH_SIZE_SHIFT 5
68#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +000070static bool log_ecn_error = true;
71module_param(log_ecn_error, bool, 0644);
72MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
73
Eric Dumazetddbe5032012-07-18 08:11:12 +000074static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
75{
76 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
77
78 return hash_32(hash, HASH_SIZE_SHIFT);
79}
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Eric Dumazet8560f222010-09-28 03:23:34 +000081static int ip6_tnl_dev_init(struct net_device *dev);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +090082static void ip6_tnl_dev_setup(struct net_device *dev);
Nicolas Dichtelc075b132012-11-09 06:10:01 +000083static struct rtnl_link_ops ip6_link_ops __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Eric Dumazetf99189b2009-11-17 10:42:49 +000085static int ip6_tnl_net_id __read_mostly;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070086struct ip6_tnl_net {
Pavel Emelyanov15820e1292008-04-16 01:23:02 -070087 /* the IPv6 tunnel fallback device */
88 struct net_device *fb_tnl_dev;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -070089 /* lists for storing tunnels in use */
Eric Dumazet94767632010-09-15 20:25:34 +000090 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
91 struct ip6_tnl __rcu *tnls_wc[1];
92 struct ip6_tnl __rcu **tnls[2];
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070093};
94
Eric Dumazet8560f222010-09-28 03:23:34 +000095static struct net_device_stats *ip6_get_stats(struct net_device *dev)
96{
David S. Miller56a43422014-01-06 17:37:45 -050097 struct pcpu_sw_netstats tmp, sum = { 0 };
Eric Dumazet8560f222010-09-28 03:23:34 +000098 int i;
99
100 for_each_possible_cpu(i) {
Li RongQingabb60132014-01-02 13:20:12 +0800101 unsigned int start;
Li RongQing8f849852014-01-04 13:57:59 +0800102 const struct pcpu_sw_netstats *tstats =
103 per_cpu_ptr(dev->tstats, i);
Eric Dumazet8560f222010-09-28 03:23:34 +0000104
Li RongQingabb60132014-01-02 13:20:12 +0800105 do {
Eric W. Biederman57a77442014-03-13 21:26:42 -0700106 start = u64_stats_fetch_begin_irq(&tstats->syncp);
Li RongQingabb60132014-01-02 13:20:12 +0800107 tmp.rx_packets = tstats->rx_packets;
108 tmp.rx_bytes = tstats->rx_bytes;
109 tmp.tx_packets = tstats->tx_packets;
110 tmp.tx_bytes = tstats->tx_bytes;
Eric W. Biederman57a77442014-03-13 21:26:42 -0700111 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
Li RongQingabb60132014-01-02 13:20:12 +0800112
113 sum.rx_packets += tmp.rx_packets;
114 sum.rx_bytes += tmp.rx_bytes;
115 sum.tx_packets += tmp.tx_packets;
116 sum.tx_bytes += tmp.tx_bytes;
Eric Dumazet8560f222010-09-28 03:23:34 +0000117 }
118 dev->stats.rx_packets = sum.rx_packets;
119 dev->stats.rx_bytes = sum.rx_bytes;
120 dev->stats.tx_packets = sum.tx_packets;
121 dev->stats.tx_bytes = sum.tx_bytes;
122 return &dev->stats;
123}
124
Eric Dumazet2922bc82009-10-23 06:34:34 +0000125/*
Eric Dumazet94767632010-09-15 20:25:34 +0000126 * Locking : hash tables are protected by RCU and RTNL
Eric Dumazet2922bc82009-10-23 06:34:34 +0000127 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000129struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
131 struct dst_entry *dst = t->dst_cache;
132
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900133 if (dst && dst->obsolete &&
Ian Morris63159f22015-03-29 14:00:04 +0100134 !dst->ops->check(dst, t->dst_cookie)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 t->dst_cache = NULL;
136 dst_release(dst);
137 return NULL;
138 }
139
140 return dst;
141}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000142EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000144void ip6_tnl_dst_reset(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
146 dst_release(t->dst_cache);
147 t->dst_cache = NULL;
148}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000149EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000151void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
153 struct rt6_info *rt = (struct rt6_info *) dst;
154 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
155 dst_release(t->dst_cache);
156 t->dst_cache = dst;
157}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000158EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900161 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900162 * @remote: the address of the tunnel exit-point
163 * @local: the address of the tunnel entry-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900165 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 * tunnel matching given end-points if found,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900167 * else fallback tunnel if its device is up,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 * else %NULL
169 **/
170
Eric Dumazet2922bc82009-10-23 06:34:34 +0000171#define for_each_ip6_tunnel_rcu(start) \
172 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174static struct ip6_tnl *
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000175ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
Eric Dumazetddbe5032012-07-18 08:11:12 +0000177 unsigned int hash = HASH(remote, local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 struct ip6_tnl *t;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700179 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Steffen Klassertea3dc962014-11-05 08:03:50 +0100180 struct in6_addr any;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Eric Dumazetddbe5032012-07-18 08:11:12 +0000182 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 if (ipv6_addr_equal(local, &t->parms.laddr) &&
184 ipv6_addr_equal(remote, &t->parms.raddr) &&
185 (t->dev->flags & IFF_UP))
186 return t;
187 }
Steffen Klassertea3dc962014-11-05 08:03:50 +0100188
189 memset(&any, 0, sizeof(any));
190 hash = HASH(&any, local);
191 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
192 if (ipv6_addr_equal(local, &t->parms.laddr) &&
193 (t->dev->flags & IFF_UP))
194 return t;
195 }
196
197 hash = HASH(remote, &any);
198 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
199 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
200 (t->dev->flags & IFF_UP))
201 return t;
202 }
203
Eric Dumazet2922bc82009-10-23 06:34:34 +0000204 t = rcu_dereference(ip6n->tnls_wc[0]);
205 if (t && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 return t;
207
208 return NULL;
209}
210
211/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900212 * ip6_tnl_bucket - get head of list matching given tunnel parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900213 * @p: parameters containing tunnel end-points
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 *
215 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900216 * ip6_tnl_bucket() returns the head of the list matching the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 * &struct in6_addr entries laddr and raddr in @p.
218 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900219 * Return: head of IPv6 tunnel list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 **/
221
Eric Dumazet94767632010-09-15 20:25:34 +0000222static struct ip6_tnl __rcu **
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000223ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000225 const struct in6_addr *remote = &p->raddr;
226 const struct in6_addr *local = &p->laddr;
Eric Dumazet95c96172012-04-15 05:58:06 +0000227 unsigned int h = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 int prio = 0;
229
230 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
231 prio = 1;
Eric Dumazetddbe5032012-07-18 08:11:12 +0000232 h = HASH(remote, local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700234 return &ip6n->tnls[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
237/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900238 * ip6_tnl_link - add tunnel to hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 * @t: tunnel to be added
240 **/
241
242static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700243ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244{
Eric Dumazet94767632010-09-15 20:25:34 +0000245 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Eric Dumazetcf778b02012-01-12 04:41:32 +0000247 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
248 rcu_assign_pointer(*tp, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249}
250
251/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900252 * ip6_tnl_unlink - remove tunnel from hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 * @t: tunnel to be removed
254 **/
255
256static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700257ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258{
Eric Dumazet94767632010-09-15 20:25:34 +0000259 struct ip6_tnl __rcu **tp;
260 struct ip6_tnl *iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Eric Dumazet94767632010-09-15 20:25:34 +0000262 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
263 (iter = rtnl_dereference(*tp)) != NULL;
264 tp = &iter->next) {
265 if (t == iter) {
Eric Dumazetcf778b02012-01-12 04:41:32 +0000266 rcu_assign_pointer(*tp, t->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 break;
268 }
269 }
270}
271
Eric Dumazet8560f222010-09-28 03:23:34 +0000272static void ip6_dev_free(struct net_device *dev)
273{
274 free_percpu(dev->tstats);
275 free_netdev(dev);
276}
277
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000278static int ip6_tnl_create2(struct net_device *dev)
279{
280 struct ip6_tnl *t = netdev_priv(dev);
281 struct net *net = dev_net(dev);
282 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
283 int err;
284
285 t = netdev_priv(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000286
287 err = register_netdevice(dev);
288 if (err < 0)
289 goto out;
290
291 strcpy(t->parms.name, dev->name);
292 dev->rtnl_link_ops = &ip6_link_ops;
293
294 dev_hold(dev);
295 ip6_tnl_link(ip6n, t);
296 return 0;
297
298out:
299 return err;
300}
301
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000303 * ip6_tnl_create - create a new tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 * @p: tunnel parameters
305 * @pt: pointer to new tunnel
306 *
307 * Description:
308 * Create tunnel matching given parameters.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900309 *
310 * Return:
Nicolas Dichtel37355562015-03-16 15:56:05 +0100311 * created tunnel or error pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 **/
313
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000314static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315{
316 struct net_device *dev;
317 struct ip6_tnl *t;
318 char name[IFNAMSIZ];
Nicolas Dichtel37355562015-03-16 15:56:05 +0100319 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800321 if (p->name[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 strlcpy(name, p->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800323 else
324 sprintf(name, "ip6tnl%%d");
325
Tom Gundersenc835a672014-07-14 16:37:24 +0200326 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
327 ip6_tnl_dev_setup);
Ian Morris63159f22015-03-29 14:00:04 +0100328 if (!dev)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800329 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Pavel Emelyanov554eb272008-04-16 01:24:13 -0700331 dev_net_set(dev, net);
332
Patrick McHardy2941a482006-01-08 22:05:26 -0800333 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 t->parms = *p;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200335 t->net = dev_net(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000336 err = ip6_tnl_create2(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +0000337 if (err < 0)
338 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Ville Nuorvala567131a2006-11-24 17:05:41 -0800340 return t;
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800341
342failed_free:
Eric Dumazet8560f222010-09-28 03:23:34 +0000343 ip6_dev_free(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800344failed:
Nicolas Dichtel37355562015-03-16 15:56:05 +0100345 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346}
347
348/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900349 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900350 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 * @create: != 0 if allowed to create new tunnel if no match found
352 *
353 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900354 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 * based on @parms. If this is unsuccessful, but @create is set a new
356 * tunnel device is created and registered for use.
357 *
358 * Return:
Nicolas Dichtel37355562015-03-16 15:56:05 +0100359 * matching tunnel or error pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 **/
361
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700362static struct ip6_tnl *ip6_tnl_locate(struct net *net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000363 struct __ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000365 const struct in6_addr *remote = &p->raddr;
366 const struct in6_addr *local = &p->laddr;
Eric Dumazet94767632010-09-15 20:25:34 +0000367 struct ip6_tnl __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700369 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Eric Dumazet94767632010-09-15 20:25:34 +0000371 for (tp = ip6_tnl_bucket(ip6n, p);
372 (t = rtnl_dereference(*tp)) != NULL;
373 tp = &t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Steffen Klassert2b0bb012014-09-22 10:07:24 +0200375 ipv6_addr_equal(remote, &t->parms.raddr)) {
376 if (create)
Nicolas Dichtel37355562015-03-16 15:56:05 +0100377 return ERR_PTR(-EEXIST);
Steffen Klassert2b0bb012014-09-22 10:07:24 +0200378
Ville Nuorvala567131a2006-11-24 17:05:41 -0800379 return t;
Steffen Klassert2b0bb012014-09-22 10:07:24 +0200380 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 }
382 if (!create)
Nicolas Dichtel37355562015-03-16 15:56:05 +0100383 return ERR_PTR(-ENODEV);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700384 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385}
386
387/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900388 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900390 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900392 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 **/
394
395static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900396ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397{
Patrick McHardy2941a482006-01-08 22:05:26 -0800398 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200399 struct net *net = t->net;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700400 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Eric Dumazet94767632010-09-15 20:25:34 +0000402 if (dev == ip6n->fb_tnl_dev)
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000403 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
Eric Dumazet94767632010-09-15 20:25:34 +0000404 else
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700405 ip6_tnl_unlink(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 ip6_tnl_dst_reset(t);
407 dev_put(dev);
408}
409
410/**
411 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
412 * @skb: received socket buffer
413 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900414 * Return:
415 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 * else index to encapsulation limit
417 **/
418
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000419__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000421 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 __u8 nexthdr = ipv6h->nexthdr;
Ian Morris67ba4152014-08-24 21:53:10 +0100423 __u16 off = sizeof(*ipv6h);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
426 __u16 optlen = 0;
427 struct ipv6_opt_hdr *hdr;
Ian Morris67ba4152014-08-24 21:53:10 +0100428 if (raw + off + sizeof(*hdr) > skb->data &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
430 break;
431
432 hdr = (struct ipv6_opt_hdr *) (raw + off);
433 if (nexthdr == NEXTHDR_FRAGMENT) {
434 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
435 if (frag_hdr->frag_off)
436 break;
437 optlen = 8;
438 } else if (nexthdr == NEXTHDR_AUTH) {
439 optlen = (hdr->hdrlen + 2) << 2;
440 } else {
441 optlen = ipv6_optlen(hdr);
442 }
443 if (nexthdr == NEXTHDR_DEST) {
444 __u16 i = off + 2;
445 while (1) {
446 struct ipv6_tlv_tnl_enc_lim *tel;
447
448 /* No more room for encapsulation limit */
449 if (i + sizeof (*tel) > off + optlen)
450 break;
451
452 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
453 /* return index of option if found and valid */
454 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
455 tel->length == 1)
456 return i;
457 /* else jump to next option */
458 if (tel->type)
459 i += tel->length + 2;
460 else
461 i++;
462 }
463 }
464 nexthdr = hdr->nexthdr;
465 off += optlen;
466 }
467 return 0;
468}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000469EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
471/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900472 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 *
474 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900475 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 * to the specifications in RFC 2473.
477 **/
478
Herbert Xud2acc342006-03-28 01:12:13 -0800479static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900480ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700481 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000483 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 struct ip6_tnl *t;
485 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700486 u8 rel_type = ICMPV6_DEST_UNREACH;
487 u8 rel_code = ICMPV6_ADDR_UNREACH;
Alexey Andriyanovacf722f2014-10-29 10:54:52 +0300488 u8 tproto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 __u32 rel_info = 0;
490 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800491 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900493 /* If the packet doesn't contain the original IPv6 header we are
494 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 processing of the error. */
496
Eric Dumazet2922bc82009-10-23 06:34:34 +0000497 rcu_read_lock();
Ian Morrise5d08d72014-11-23 21:28:43 +0000498 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
Ian Morris63159f22015-03-29 14:00:04 +0100499 if (!t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 goto out;
501
Alexey Andriyanovacf722f2014-10-29 10:54:52 +0300502 tproto = ACCESS_ONCE(t->parms.proto);
503 if (tproto != ipproto && tproto != 0)
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900504 goto out;
505
Herbert Xud2acc342006-03-28 01:12:13 -0800506 err = 0;
507
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900508 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 __u32 teli;
510 struct ipv6_tlv_tnl_enc_lim *tel;
511 __u32 mtu;
512 case ICMPV6_DEST_UNREACH:
Joe Perchese87cc472012-05-13 21:56:26 +0000513 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
514 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 rel_msg = 1;
516 break;
517 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900518 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Joe Perchese87cc472012-05-13 21:56:26 +0000519 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
520 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 rel_msg = 1;
522 }
523 break;
524 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800525 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900526 if ((*code) == ICMPV6_HDR_FIELD)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000527 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
Al Viro704eae12007-07-26 17:33:29 +0100529 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
531 if (tel->encap_limit == 0) {
Joe Perchese87cc472012-05-13 21:56:26 +0000532 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
533 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 rel_msg = 1;
535 }
Joe Perchese87cc472012-05-13 21:56:26 +0000536 } else {
537 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
538 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 }
540 break;
541 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100542 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 if (mtu < IPV6_MIN_MTU)
544 mtu = IPV6_MIN_MTU;
545 t->dev->mtu = mtu;
546
Ian Morrise5d08d72014-11-23 21:28:43 +0000547 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
548 if (len > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 rel_type = ICMPV6_PKT_TOOBIG;
550 rel_code = 0;
551 rel_info = mtu;
552 rel_msg = 1;
553 }
554 break;
555 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900556
557 *type = rel_type;
558 *code = rel_code;
559 *info = rel_info;
560 *msg = rel_msg;
561
562out:
Eric Dumazet2922bc82009-10-23 06:34:34 +0000563 rcu_read_unlock();
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900564 return err;
565}
566
567static int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900568ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700569 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900570{
571 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700572 u8 rel_type = type;
573 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100574 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900575 int err;
576 struct sk_buff *skb2;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000577 const struct iphdr *eiph;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900578 struct rtable *rt;
David S. Miller31e45432011-05-03 20:25:42 -0700579 struct flowi4 fl4;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900580
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900581 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
582 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900583 if (err < 0)
584 return err;
585
586 if (rel_msg == 0)
587 return 0;
588
589 switch (rel_type) {
590 case ICMPV6_DEST_UNREACH:
591 if (rel_code != ICMPV6_ADDR_UNREACH)
592 return 0;
593 rel_type = ICMP_DEST_UNREACH;
594 rel_code = ICMP_HOST_UNREACH;
595 break;
596 case ICMPV6_PKT_TOOBIG:
597 if (rel_code != 0)
598 return 0;
599 rel_type = ICMP_DEST_UNREACH;
600 rel_code = ICMP_FRAG_NEEDED;
601 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700602 case NDISC_REDIRECT:
603 rel_type = ICMP_REDIRECT;
604 rel_code = ICMP_REDIR_HOST;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900605 default:
606 return 0;
607 }
608
609 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
610 return 0;
611
612 skb2 = skb_clone(skb, GFP_ATOMIC);
613 if (!skb2)
614 return 0;
615
Eric Dumazetadf30902009-06-02 05:19:30 +0000616 skb_dst_drop(skb2);
617
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900618 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700619 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700620 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900621
622 /* Try to guess incoming interface */
David S. Miller31e45432011-05-03 20:25:42 -0700623 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500624 eiph->saddr, 0,
625 0, 0,
626 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800627 if (IS_ERR(rt))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900628 goto out;
629
Changli Gaod8d1f302010-06-10 23:31:35 -0700630 skb2->dev = rt->dst.dev;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900631
632 /* route "incoming" packet */
633 if (rt->rt_flags & RTCF_LOCAL) {
634 ip_rt_put(rt);
635 rt = NULL;
David S. Miller31e45432011-05-03 20:25:42 -0700636 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500637 eiph->daddr, eiph->saddr,
638 0, 0,
639 IPPROTO_IPIP,
640 RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800641 if (IS_ERR(rt) ||
Changli Gaod8d1f302010-06-10 23:31:35 -0700642 rt->dst.dev->type != ARPHRD_TUNNEL) {
David S. Millerb23dd4f2011-03-02 14:31:35 -0800643 if (!IS_ERR(rt))
644 ip_rt_put(rt);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900645 goto out;
646 }
David S. Millerb23dd4f2011-03-02 14:31:35 -0800647 skb_dst_set(skb2, &rt->dst);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900648 } else {
649 ip_rt_put(rt);
650 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
651 skb2->dev) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000652 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900653 goto out;
654 }
655
656 /* change mtu on this route */
657 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000658 if (rel_info > dst_mtu(skb_dst(skb2)))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900659 goto out;
660
David S. Miller6700c272012-07-17 03:29:28 -0700661 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900662 }
David S. Miller1ed5c482012-07-12 00:41:25 -0700663 if (rel_type == ICMP_REDIRECT)
David S. Miller6700c272012-07-17 03:29:28 -0700664 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900665
Al Viro704eae12007-07-26 17:33:29 +0100666 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900667
668out:
669 kfree_skb(skb2);
670 return 0;
671}
672
673static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900674ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700675 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900676{
677 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700678 u8 rel_type = type;
679 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100680 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900681 int err;
682
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900683 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
684 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900685 if (err < 0)
686 return err;
687
688 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 struct rt6_info *rt;
690 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800691
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900693 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
Eric Dumazetadf30902009-06-02 05:19:30 +0000695 skb_dst_drop(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700697 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700700 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
701 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
David S. Millerd1918542011-12-28 20:19:20 -0500703 if (rt && rt->dst.dev)
704 skb2->dev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000706 icmpv6_send(skb2, rel_type, rel_code, rel_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Amerigo Wang94e187c2012-10-29 00:13:19 +0000708 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
710 kfree_skb(skb2);
711 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900712
713 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714}
715
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000716static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
717 const struct ipv6hdr *ipv6h,
718 struct sk_buff *skb)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900719{
720 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
721
722 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700723 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900724
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000725 return IP6_ECN_decapsulate(ipv6h, skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900726}
727
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000728static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
729 const struct ipv6hdr *ipv6h,
730 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900732 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b42007-11-13 21:40:13 -0800733 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000735 return IP6_ECN_decapsulate(ipv6h, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900737
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000738__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000739 const struct in6_addr *laddr,
740 const struct in6_addr *raddr)
741{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000742 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000743 int ltype = ipv6_addr_type(laddr);
744 int rtype = ipv6_addr_type(raddr);
745 __u32 flags = 0;
746
747 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
748 flags = IP6_TNL_F_CAP_PER_PACKET;
749 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
750 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
751 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
752 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
753 if (ltype&IPV6_ADDR_UNICAST)
754 flags |= IP6_TNL_F_CAP_XMIT;
755 if (rtype&IPV6_ADDR_UNICAST)
756 flags |= IP6_TNL_F_CAP_RCV;
757 }
758 return flags;
759}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000760EXPORT_SYMBOL(ip6_tnl_get_cap);
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000761
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100762/* called with rcu_read_lock() */
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000763int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000764 const struct in6_addr *laddr,
765 const struct in6_addr *raddr)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800766{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000767 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800768 int ret = 0;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200769 struct net *net = t->net;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800770
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000771 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
772 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
773 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900774 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800775
776 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100777 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800778
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000779 if ((ipv6_addr_is_multicast(laddr) ||
780 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
781 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800782 ret = 1;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800783 }
784 return ret;
785}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000786EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
788/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900789 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 * @skb: received socket buffer
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900791 * @protocol: ethernet protocol ID
792 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 *
794 * Return: 0
795 **/
796
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900797static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900798 __u8 ipproto,
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000799 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
800 const struct ipv6hdr *ipv6h,
801 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 struct ip6_tnl *t;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000804 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Alexey Andriyanovacf722f2014-10-29 10:54:52 +0300805 u8 tproto;
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000806 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
Eric Dumazet2922bc82009-10-23 06:34:34 +0000808 rcu_read_lock();
Ian Morrise5d08d72014-11-23 21:28:43 +0000809 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
Ian Morris53b24b82015-03-29 14:00:05 +0100810 if (t) {
Li RongQing8f849852014-01-04 13:57:59 +0800811 struct pcpu_sw_netstats *tstats;
Eric Dumazet8560f222010-09-28 03:23:34 +0000812
Alexey Andriyanovacf722f2014-10-29 10:54:52 +0300813 tproto = ACCESS_ONCE(t->parms.proto);
814 if (tproto != ipproto && tproto != 0) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000815 rcu_read_unlock();
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900816 goto discard;
817 }
818
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000820 rcu_read_unlock();
Herbert Xu50fba2a2006-04-04 13:50:45 -0700821 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 }
823
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000824 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700825 t->dev->stats.rx_dropped++;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000826 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 goto discard;
828 }
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700829 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700830 skb_reset_network_header(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900831 skb->protocol = htons(protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700833
Nicolas Dichtelea231922013-09-02 15:34:58 +0200834 __skb_tunnel_rx(skb, t->dev, t->net);
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000835
836 err = dscp_ecn_decapsulate(t, ipv6h, skb);
837 if (unlikely(err)) {
838 if (log_ecn_error)
839 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
840 &ipv6h->saddr,
841 ipv6_get_dsfield(ipv6h));
842 if (err > 1) {
843 ++t->dev->stats.rx_frame_errors;
844 ++t->dev->stats.rx_errors;
845 rcu_read_unlock();
846 goto discard;
847 }
848 }
849
Eric Dumazet8560f222010-09-28 03:23:34 +0000850 tstats = this_cpu_ptr(t->dev->tstats);
Li RongQingabb60132014-01-02 13:20:12 +0800851 u64_stats_update_begin(&tstats->syncp);
Eric Dumazet8560f222010-09-28 03:23:34 +0000852 tstats->rx_packets++;
853 tstats->rx_bytes += skb->len;
Li RongQingabb60132014-01-02 13:20:12 +0800854 u64_stats_update_end(&tstats->syncp);
Eric Dumazet8560f222010-09-28 03:23:34 +0000855
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000856 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000857
Eric Dumazet2922bc82009-10-23 06:34:34 +0000858 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 return 0;
860 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000861 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 return 1;
Herbert Xu50fba2a2006-04-04 13:50:45 -0700863
864discard:
865 kfree_skb(skb);
866 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867}
868
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900869static int ip4ip6_rcv(struct sk_buff *skb)
870{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900871 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
872 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900873}
874
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900875static int ip6ip6_rcv(struct sk_buff *skb)
876{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900877 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
878 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900879}
880
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800881struct ipv6_tel_txoption {
882 struct ipv6_txoptions ops;
883 __u8 dst_opt[8];
884};
885
886static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800888 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800890 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
891 opt->dst_opt[3] = 1;
892 opt->dst_opt[4] = encap_limit;
893 opt->dst_opt[5] = IPV6_TLV_PADN;
894 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800896 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
897 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898}
899
900/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900901 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900903 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 *
905 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900906 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 * doesn't match source of incoming packet.
908 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900909 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 * 1 if conflict,
911 * 0 else
912 **/
913
Eric Dumazet92113bf2012-05-18 08:14:11 +0200914static inline bool
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000915ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916{
917 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
918}
919
Steffen Klassertd5005142014-11-05 08:02:48 +0100920int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
921 const struct in6_addr *laddr,
922 const struct in6_addr *raddr)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800923{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000924 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800925 int ret = 0;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200926 struct net *net = t->net;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800927
Steffen Klassertd5005142014-11-05 08:02:48 +0100928 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
929 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
930 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800931 struct net_device *ldev = NULL;
932
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100933 rcu_read_lock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800934 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100935 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800936
Steffen Klassertd5005142014-11-05 08:02:48 +0100937 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000938 pr_warn("%s xmit: Local address not yet configured!\n",
939 p->name);
Steffen Klassertd5005142014-11-05 08:02:48 +0100940 else if (!ipv6_addr_is_multicast(raddr) &&
941 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000942 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
943 p->name);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800944 else
945 ret = 1;
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100946 rcu_read_unlock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800947 }
948 return ret;
949}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000950EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
951
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952/**
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900953 * ip6_tnl_xmit2 - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900955 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900956 * @dsfield: dscp code for outer header
957 * @fl: flow of tunneled packet
958 * @encap_limit: encapsulation limit
959 * @pmtu: Path MTU is stored if packet is too big
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 *
961 * Description:
962 * Build new header and do some sanity checks on the packet before sending
963 * it.
964 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900965 * Return:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900966 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900967 * -1 fail
968 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 **/
970
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900971static int ip6_tnl_xmit2(struct sk_buff *skb,
972 struct net_device *dev,
973 __u8 dsfield,
David S. Miller4c9483b2011-03-12 16:22:43 -0500974 struct flowi6 *fl6,
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900975 int encap_limit,
976 __u32 *pmtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977{
Patrick McHardy2941a482006-01-08 22:05:26 -0800978 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200979 struct net *net = t->net;
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700980 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700981 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800982 struct ipv6_tel_txoption opt;
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400983 struct dst_entry *dst = NULL, *ndst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 struct net_device *tdev;
985 int mtu;
Chuck Leverc2636b42007-10-23 21:07:32 -0700986 unsigned int max_headroom = sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 u8 proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900988 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
Steffen Klassertea3dc962014-11-05 08:03:50 +0100990 /* NBMA tunnel */
991 if (ipv6_addr_any(&t->parms.raddr)) {
992 struct in6_addr *addr6;
993 struct neighbour *neigh;
994 int addr_type;
995
996 if (!skb_dst(skb))
997 goto tx_err_link_failure;
998
999 neigh = dst_neigh_lookup(skb_dst(skb),
1000 &ipv6_hdr(skb)->daddr);
1001 if (!neigh)
1002 goto tx_err_link_failure;
1003
1004 addr6 = (struct in6_addr *)&neigh->primary_key;
1005 addr_type = ipv6_addr_type(addr6);
1006
1007 if (addr_type == IPV6_ADDR_ANY)
1008 addr6 = &ipv6_hdr(skb)->daddr;
1009
1010 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1011 neigh_release(neigh);
1012 } else if (!fl6->flowi6_mark)
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001013 dst = ip6_tnl_dst_check(t);
Steffen Klassertd5005142014-11-05 08:02:48 +01001014
1015 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1016 goto tx_err_link_failure;
1017
Eric Dumazet89b02122011-07-28 04:32:25 +00001018 if (!dst) {
1019 ndst = ip6_route_output(net, NULL, fl6);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
Eric Dumazet89b02122011-07-28 04:32:25 +00001021 if (ndst->error)
Patrick McHardya57ebc92005-09-08 14:27:47 -07001022 goto tx_err_link_failure;
Eric Dumazet89b02122011-07-28 04:32:25 +00001023 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
1024 if (IS_ERR(ndst)) {
1025 err = PTR_ERR(ndst);
1026 ndst = NULL;
David S. Miller452edd52011-03-02 13:27:41 -08001027 goto tx_err_link_failure;
1028 }
Eric Dumazet89b02122011-07-28 04:32:25 +00001029 dst = ndst;
Patrick McHardya57ebc92005-09-08 14:27:47 -07001030 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031
1032 tdev = dst->dev;
1033
1034 if (tdev == dev) {
1035 stats->collisions++;
Joe Perchese87cc472012-05-13 21:56:26 +00001036 net_warn_ratelimited("%s: Local routing loop detected!\n",
1037 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 goto tx_err_dst_release;
1039 }
Ian Morris67ba4152014-08-24 21:53:10 +01001040 mtu = dst_mtu(dst) - sizeof(*ipv6h);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -08001041 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 max_headroom += 8;
1043 mtu -= 8;
1044 }
1045 if (mtu < IPV6_MIN_MTU)
1046 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +00001047 if (skb_dst(skb))
David S. Miller6700c272012-07-17 03:29:28 -07001048 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 if (skb->len > mtu) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001050 *pmtu = mtu;
1051 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 goto tx_err_dst_release;
1053 }
1054
Nicolas Dichtel963a88b2013-09-02 15:34:57 +02001055 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001056
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 /*
1058 * Okay, now see if we can stuff it in the buffer as-is.
1059 */
1060 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001061
Patrick McHardycfbba492007-07-09 15:33:40 -07001062 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1063 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001065
Ian Morrise5d08d72014-11-23 21:28:43 +00001066 new_skb = skb_realloc_headroom(skb, max_headroom);
1067 if (!new_skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 goto tx_err_dst_release;
1069
1070 if (skb->sk)
1071 skb_set_owner_w(new_skb, skb->sk);
Eric Dumazet9ff26442012-04-19 02:24:17 +00001072 consume_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 skb = new_skb;
1074 }
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001075 if (fl6->flowi6_mark) {
1076 skb_dst_set(skb, dst);
1077 ndst = NULL;
1078 } else {
1079 skb_dst_set_noref(skb, dst);
1080 }
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07001081 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
David S. Miller4c9483b2011-03-12 16:22:43 -05001083 proto = fl6->flowi6_proto;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -08001084 if (encap_limit >= 0) {
1085 init_tel_txopt(&opt, encap_limit);
1086 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1087 }
Hannes Frederic Sowa3d483052013-08-18 13:46:52 +02001088
1089 if (likely(!skb->encapsulation)) {
1090 skb_reset_inner_headers(skb);
1091 skb->encapsulation = 1;
1092 }
1093
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -07001094 skb_push(skb, sizeof(struct ipv6hdr));
1095 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001096 ipv6h = ipv6_hdr(skb);
Tom Herbertcb1ce2e2014-07-01 21:33:10 -07001097 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
1098 ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 ipv6h->hop_limit = t->parms.hop_limit;
1100 ipv6h->nexthdr = proto;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001101 ipv6h->saddr = fl6->saddr;
1102 ipv6h->daddr = fl6->daddr;
Cong Wange8f72ea2013-03-09 23:00:39 +00001103 ip6tunnel_xmit(skb, dev);
Eric Dumazet89b02122011-07-28 04:32:25 +00001104 if (ndst)
1105 ip6_tnl_dst_store(t, ndst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 return 0;
1107tx_err_link_failure:
1108 stats->tx_carrier_errors++;
1109 dst_link_failure(skb);
1110tx_err_dst_release:
Eric Dumazet89b02122011-07-28 04:32:25 +00001111 dst_release(ndst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001112 return err;
1113}
1114
1115static inline int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001116ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1117{
1118 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001119 const struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001120 int encap_limit = -1;
David S. Miller4c9483b2011-03-12 16:22:43 -05001121 struct flowi6 fl6;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001122 __u8 dsfield;
1123 __u32 mtu;
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001124 u8 tproto;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001125 int err;
1126
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001127 tproto = ACCESS_ONCE(t->parms.proto);
Steffen Klassertd5005142014-11-05 08:02:48 +01001128 if (tproto != IPPROTO_IPIP && tproto != 0)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001129 return -1;
1130
1131 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1132 encap_limit = t->parms.encap_limit;
1133
Ian Morris67ba4152014-08-24 21:53:10 +01001134 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
David S. Miller4c9483b2011-03-12 16:22:43 -05001135 fl6.flowi6_proto = IPPROTO_IPIP;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001136
1137 dsfield = ipv4_get_dsfield(iph);
1138
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 |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
Al Virob77f2fa2007-07-21 19:09:41 -07001141 & IPV6_TCLASS_MASK;
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001142 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1143 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001144
David S. Miller4c9483b2011-03-12 16:22:43 -05001145 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001146 if (err != 0) {
1147 /* XXX: send ICMP error even if DF is not set. */
1148 if (err == -EMSGSIZE)
1149 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1150 htonl(mtu));
1151 return -1;
1152 }
1153
1154 return 0;
1155}
1156
1157static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001158ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1159{
1160 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001161 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001162 int encap_limit = -1;
1163 __u16 offset;
David S. Miller4c9483b2011-03-12 16:22:43 -05001164 struct flowi6 fl6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001165 __u8 dsfield;
1166 __u32 mtu;
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001167 u8 tproto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001168 int err;
1169
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001170 tproto = ACCESS_ONCE(t->parms.proto);
1171 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
Steffen Klassertd5005142014-11-05 08:02:48 +01001172 ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001173 return -1;
1174
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001175 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001176 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001177 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001178 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001179 if (tel->encap_limit == 0) {
1180 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001181 ICMPV6_HDR_FIELD, offset + 2);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001182 return -1;
1183 }
1184 encap_limit = tel->encap_limit - 1;
1185 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1186 encap_limit = t->parms.encap_limit;
1187
Ian Morris67ba4152014-08-24 21:53:10 +01001188 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
David S. Miller4c9483b2011-03-12 16:22:43 -05001189 fl6.flowi6_proto = IPPROTO_IPV6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001190
1191 dsfield = ipv6_get_dsfield(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001192 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001193 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001194 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
Florent Fourcot3308de22013-12-08 15:47:00 +01001195 fl6.flowlabel |= ip6_flowlabel(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001196 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1197 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001198
David S. Miller4c9483b2011-03-12 16:22:43 -05001199 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001200 if (err != 0) {
1201 if (err == -EMSGSIZE)
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001202 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001203 return -1;
1204 }
1205
1206 return 0;
1207}
1208
Stephen Hemminger6fef4c02009-08-31 19:50:41 +00001209static netdev_tx_t
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001210ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1211{
1212 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001213 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001214 int ret;
1215
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001216 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001217 case htons(ETH_P_IP):
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001218 ret = ip4ip6_tnl_xmit(skb, dev);
1219 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001220 case htons(ETH_P_IPV6):
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001221 ret = ip6ip6_tnl_xmit(skb, dev);
1222 break;
1223 default:
1224 goto tx_err;
1225 }
1226
1227 if (ret < 0)
1228 goto tx_err;
1229
Patrick McHardy6ed10652009-06-23 06:03:08 +00001230 return NETDEV_TX_OK;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001231
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232tx_err:
1233 stats->tx_errors++;
1234 stats->tx_dropped++;
1235 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +00001236 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237}
1238
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001239static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240{
1241 struct net_device *dev = t->dev;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001242 struct __ip6_tnl_parm *p = &t->parms;
David S. Miller4c9483b2011-03-12 16:22:43 -05001243 struct flowi6 *fl6 = &t->fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
Jiri Pirko3a6d54c2009-05-11 23:37:15 +00001245 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1246 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247
1248 /* Set up flowi template */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001249 fl6->saddr = p->laddr;
1250 fl6->daddr = p->raddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001251 fl6->flowi6_oif = p->link;
1252 fl6->flowlabel = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
1254 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001255 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001257 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001259 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1260 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261
1262 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1263 dev->flags |= IFF_POINTOPOINT;
1264 else
1265 dev->flags &= ~IFF_POINTOPOINT;
1266
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001268 int strict = (ipv6_addr_type(&p->raddr) &
1269 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1270
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001271 struct rt6_info *rt = rt6_lookup(t->net,
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001272 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001273 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274
Ian Morris63159f22015-03-29 14:00:04 +01001275 if (!rt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 return;
1277
David S. Millerd1918542011-12-28 20:19:20 -05001278 if (rt->dst.dev) {
1279 dev->hard_header_len = rt->dst.dev->hard_header_len +
Ian Morris67ba4152014-08-24 21:53:10 +01001280 sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281
Ian Morris67ba4152014-08-24 21:53:10 +01001282 dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001283 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
Ian Morris67ba4152014-08-24 21:53:10 +01001284 dev->mtu -= 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285
1286 if (dev->mtu < IPV6_MIN_MTU)
1287 dev->mtu = IPV6_MIN_MTU;
1288 }
Amerigo Wang94e187c2012-10-29 00:13:19 +00001289 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 }
1291}
1292
1293/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001294 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 * @t: tunnel to be changed
1296 * @p: tunnel configuration parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 *
1298 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001299 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 **/
1301
1302static int
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001303ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304{
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001305 t->parms.laddr = p->laddr;
1306 t->parms.raddr = p->raddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 t->parms.flags = p->flags;
1308 t->parms.hop_limit = p->hop_limit;
1309 t->parms.encap_limit = p->encap_limit;
1310 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001311 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001312 t->parms.proto = p->proto;
Hugo Santos0c088892006-02-24 13:16:25 -08001313 ip6_tnl_dst_reset(t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001314 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 return 0;
1316}
1317
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001318static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1319{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001320 struct net *net = t->net;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001321 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1322 int err;
1323
1324 ip6_tnl_unlink(ip6n, t);
1325 synchronize_net();
1326 err = ip6_tnl_change(t, p);
1327 ip6_tnl_link(ip6n, t);
1328 netdev_state_change(t->dev);
1329 return err;
1330}
1331
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001332static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1333{
1334 /* for default tnl0 device allow to change only the proto */
1335 t->parms.proto = p->proto;
1336 netdev_state_change(t->dev);
1337 return 0;
1338}
1339
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001340static void
1341ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1342{
1343 p->laddr = u->laddr;
1344 p->raddr = u->raddr;
1345 p->flags = u->flags;
1346 p->hop_limit = u->hop_limit;
1347 p->encap_limit = u->encap_limit;
1348 p->flowinfo = u->flowinfo;
1349 p->link = u->link;
1350 p->proto = u->proto;
1351 memcpy(p->name, u->name, sizeof(u->name));
1352}
1353
1354static void
1355ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1356{
1357 u->laddr = p->laddr;
1358 u->raddr = p->raddr;
1359 u->flags = p->flags;
1360 u->hop_limit = p->hop_limit;
1361 u->encap_limit = p->encap_limit;
1362 u->flowinfo = p->flowinfo;
1363 u->link = p->link;
1364 u->proto = p->proto;
1365 memcpy(u->name, p->name, sizeof(u->name));
1366}
1367
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001369 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 * @dev: virtual device associated with tunnel
1371 * @ifr: parameters passed from userspace
1372 * @cmd: command to be performed
1373 *
1374 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001375 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001376 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 *
1378 * The possible commands are the following:
1379 * %SIOCGETTUNNEL: get tunnel parameters for device
1380 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1381 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1382 * %SIOCDELTUNNEL: delete tunnel
1383 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001384 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 * initialization, can be used for creating other tunnel devices.
1386 *
1387 * Return:
1388 * 0 on success,
1389 * %-EFAULT if unable to copy data to or from userspace,
1390 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1391 * %-EINVAL if passed tunnel parameters are invalid,
1392 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1393 * %-ENODEV if attempting to change or delete a nonexisting device
1394 **/
1395
1396static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001397ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398{
1399 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 struct ip6_tnl_parm p;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001401 struct __ip6_tnl_parm p1;
Nicolas Dichtel74462f02014-04-16 11:19:34 +02001402 struct ip6_tnl *t = netdev_priv(dev);
1403 struct net *net = t->net;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001404 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405
1406 switch (cmd) {
1407 case SIOCGETTUNNEL:
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001408 if (dev == ip6n->fb_tnl_dev) {
Ian Morris67ba4152014-08-24 21:53:10 +01001409 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 err = -EFAULT;
1411 break;
1412 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001413 ip6_tnl_parm_from_user(&p1, &p);
1414 t = ip6_tnl_locate(net, &p1, 0);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001415 if (IS_ERR(t))
Nicolas Dichtel74462f02014-04-16 11:19:34 +02001416 t = netdev_priv(dev);
Dan Carpenter5ef5d6c2012-08-16 03:14:04 +00001417 } else {
1418 memset(&p, 0, sizeof(p));
Ville Nuorvala567131a2006-11-24 17:05:41 -08001419 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001420 ip6_tnl_parm_to_user(&p, &t->parms);
Ian Morris67ba4152014-08-24 21:53:10 +01001421 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 err = -EFAULT;
1423 }
1424 break;
1425 case SIOCADDTUNNEL:
1426 case SIOCCHGTUNNEL:
1427 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001428 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001430 err = -EFAULT;
Ian Morris67ba4152014-08-24 21:53:10 +01001431 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001433 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001434 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1435 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 break;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001437 ip6_tnl_parm_from_user(&p1, &p);
1438 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001439 if (cmd == SIOCCHGTUNNEL) {
Nicolas Dichtel37355562015-03-16 15:56:05 +01001440 if (!IS_ERR(t)) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001441 if (t->dev != dev) {
1442 err = -EEXIST;
1443 break;
1444 }
1445 } else
1446 t = netdev_priv(dev);
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001447 if (dev == ip6n->fb_tnl_dev)
1448 err = ip6_tnl0_update(t, &p1);
1449 else
1450 err = ip6_tnl_update(t, &p1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 }
Nicolas Dichtel37355562015-03-16 15:56:05 +01001452 if (!IS_ERR(t)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 err = 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001454 ip6_tnl_parm_to_user(&p, &t->parms);
1455 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
Ville Nuorvala567131a2006-11-24 17:05:41 -08001456 err = -EFAULT;
1457
Nicolas Dichtel37355562015-03-16 15:56:05 +01001458 } else {
1459 err = PTR_ERR(t);
1460 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 break;
1462 case SIOCDELTUNNEL:
1463 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001464 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 break;
1466
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001467 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001468 err = -EFAULT;
Ian Morris67ba4152014-08-24 21:53:10 +01001469 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001471 err = -ENOENT;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001472 ip6_tnl_parm_from_user(&p1, &p);
1473 t = ip6_tnl_locate(net, &p1, 0);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001474 if (IS_ERR(t))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001476 err = -EPERM;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001477 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001479 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001481 err = 0;
1482 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 break;
1484 default:
1485 err = -EINVAL;
1486 }
1487 return err;
1488}
1489
1490/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001491 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 * @dev: virtual device associated with tunnel
1493 * @new_mtu: the new mtu
1494 *
1495 * Return:
1496 * 0 on success,
1497 * %-EINVAL if mtu too small
1498 **/
1499
1500static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001501ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502{
Oussama Ghorbel582442d2013-10-03 14:49:26 +01001503 struct ip6_tnl *tnl = netdev_priv(dev);
1504
1505 if (tnl->parms.proto == IPPROTO_IPIP) {
1506 if (new_mtu < 68)
1507 return -EINVAL;
1508 } else {
1509 if (new_mtu < IPV6_MIN_MTU)
1510 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 }
Oussama Ghorbel582442d2013-10-03 14:49:26 +01001512 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1513 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 dev->mtu = new_mtu;
1515 return 0;
1516}
1517
Nicolas Dichtelecf2c062015-04-02 17:07:01 +02001518int ip6_tnl_get_iflink(const struct net_device *dev)
1519{
1520 struct ip6_tnl *t = netdev_priv(dev);
1521
1522 return t->parms.link;
1523}
1524EXPORT_SYMBOL(ip6_tnl_get_iflink);
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001525
1526static const struct net_device_ops ip6_tnl_netdev_ops = {
Steffen Klassert6c6151d2014-11-03 09:19:27 +01001527 .ndo_init = ip6_tnl_dev_init,
Eric Dumazet8560f222010-09-28 03:23:34 +00001528 .ndo_uninit = ip6_tnl_dev_uninit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001529 .ndo_start_xmit = ip6_tnl_xmit,
Eric Dumazet8560f222010-09-28 03:23:34 +00001530 .ndo_do_ioctl = ip6_tnl_ioctl,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001531 .ndo_change_mtu = ip6_tnl_change_mtu,
Eric Dumazet8560f222010-09-28 03:23:34 +00001532 .ndo_get_stats = ip6_get_stats,
Nicolas Dichtelecf2c062015-04-02 17:07:01 +02001533 .ndo_get_iflink = ip6_tnl_get_iflink,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001534};
1535
Eric Dumazet8560f222010-09-28 03:23:34 +00001536
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001538 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 * @dev: virtual device associated with tunnel
1540 *
1541 * Description:
1542 * Initialize function pointers and device parameters
1543 **/
1544
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001545static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546{
Anders Franzen381601e2010-11-24 05:47:18 +00001547 struct ip6_tnl *t;
1548
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001549 dev->netdev_ops = &ip6_tnl_netdev_ops;
Eric Dumazet8560f222010-09-28 03:23:34 +00001550 dev->destructor = ip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551
1552 dev->type = ARPHRD_TUNNEL6;
Ian Morris67ba4152014-08-24 21:53:10 +01001553 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
1554 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001555 t = netdev_priv(dev);
1556 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
Ian Morris67ba4152014-08-24 21:53:10 +01001557 dev->mtu -= 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 dev->flags |= IFF_NOARP;
1559 dev->addr_len = sizeof(struct in6_addr);
Eric Dumazet02875872014-10-05 18:38:35 -07001560 netif_keep_dst(dev);
Nicolas Dichtele8377352013-08-20 12:16:06 +02001561 /* This perm addr will be used as interface identifier by IPv6 */
1562 dev->addr_assign_type = NET_ADDR_RANDOM;
1563 eth_random_addr(dev->perm_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564}
1565
1566
1567/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001568 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 * @dev: virtual device associated with tunnel
1570 **/
1571
Eric Dumazet8560f222010-09-28 03:23:34 +00001572static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001573ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574{
Patrick McHardy2941a482006-01-08 22:05:26 -08001575 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001576
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 t->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001578 t->net = dev_net(dev);
WANG Cong1c213bd2014-02-13 11:46:28 -08001579 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Eric Dumazet8560f222010-09-28 03:23:34 +00001580 if (!dev->tstats)
1581 return -ENOMEM;
1582 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583}
1584
1585/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001586 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 * @dev: virtual device associated with tunnel
1588 **/
1589
Eric Dumazet8560f222010-09-28 03:23:34 +00001590static int ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591{
Patrick McHardy2941a482006-01-08 22:05:26 -08001592 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001593 int err = ip6_tnl_dev_init_gen(dev);
1594
1595 if (err)
1596 return err;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001597 ip6_tnl_link_config(t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001598 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599}
1600
1601/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001602 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 * @dev: fallback device
1604 *
1605 * Return: 0
1606 **/
1607
Eric Dumazet8560f222010-09-28 03:23:34 +00001608static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609{
Patrick McHardy2941a482006-01-08 22:05:26 -08001610 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001611 struct net *net = dev_net(dev);
1612 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Eric Dumazet8560f222010-09-28 03:23:34 +00001613
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001614 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615 dev_hold(dev);
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001616
Eric Dumazetcf778b02012-01-12 04:41:32 +00001617 rcu_assign_pointer(ip6n->tnls_wc[0], t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001618 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619}
1620
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001621static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1622{
1623 u8 proto;
1624
Susant Sahanic8965932014-05-10 00:11:32 +05301625 if (!data || !data[IFLA_IPTUN_PROTO])
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001626 return 0;
1627
1628 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1629 if (proto != IPPROTO_IPV6 &&
1630 proto != IPPROTO_IPIP &&
1631 proto != 0)
1632 return -EINVAL;
1633
1634 return 0;
1635}
1636
1637static void ip6_tnl_netlink_parms(struct nlattr *data[],
1638 struct __ip6_tnl_parm *parms)
1639{
1640 memset(parms, 0, sizeof(*parms));
1641
1642 if (!data)
1643 return;
1644
1645 if (data[IFLA_IPTUN_LINK])
1646 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1647
1648 if (data[IFLA_IPTUN_LOCAL])
Jiri Benc67b61f62015-03-29 16:59:26 +02001649 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001650
1651 if (data[IFLA_IPTUN_REMOTE])
Jiri Benc67b61f62015-03-29 16:59:26 +02001652 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001653
1654 if (data[IFLA_IPTUN_TTL])
1655 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1656
1657 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1658 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1659
1660 if (data[IFLA_IPTUN_FLOWINFO])
Nicolas Dichtel1ff05fb2012-11-15 04:06:42 +00001661 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001662
1663 if (data[IFLA_IPTUN_FLAGS])
1664 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1665
1666 if (data[IFLA_IPTUN_PROTO])
1667 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1668}
1669
1670static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1671 struct nlattr *tb[], struct nlattr *data[])
1672{
1673 struct net *net = dev_net(dev);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001674 struct ip6_tnl *nt, *t;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001675
1676 nt = netdev_priv(dev);
1677 ip6_tnl_netlink_parms(data, &nt->parms);
1678
Nicolas Dichtel37355562015-03-16 15:56:05 +01001679 t = ip6_tnl_locate(net, &nt->parms, 0);
1680 if (!IS_ERR(t))
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001681 return -EEXIST;
1682
1683 return ip6_tnl_create2(dev);
1684}
1685
1686static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1687 struct nlattr *data[])
1688{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001689 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001690 struct __ip6_tnl_parm p;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001691 struct net *net = t->net;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001692 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1693
1694 if (dev == ip6n->fb_tnl_dev)
1695 return -EINVAL;
1696
1697 ip6_tnl_netlink_parms(data, &p);
1698
1699 t = ip6_tnl_locate(net, &p, 0);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001700 if (!IS_ERR(t)) {
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001701 if (t->dev != dev)
1702 return -EEXIST;
1703 } else
1704 t = netdev_priv(dev);
1705
1706 return ip6_tnl_update(t, &p);
1707}
1708
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001709static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1710{
1711 struct net *net = dev_net(dev);
1712 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1713
1714 if (dev != ip6n->fb_tnl_dev)
1715 unregister_netdevice_queue(dev, head);
1716}
1717
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001718static size_t ip6_tnl_get_size(const struct net_device *dev)
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001719{
1720 return
1721 /* IFLA_IPTUN_LINK */
1722 nla_total_size(4) +
1723 /* IFLA_IPTUN_LOCAL */
1724 nla_total_size(sizeof(struct in6_addr)) +
1725 /* IFLA_IPTUN_REMOTE */
1726 nla_total_size(sizeof(struct in6_addr)) +
1727 /* IFLA_IPTUN_TTL */
1728 nla_total_size(1) +
1729 /* IFLA_IPTUN_ENCAP_LIMIT */
1730 nla_total_size(1) +
1731 /* IFLA_IPTUN_FLOWINFO */
1732 nla_total_size(4) +
1733 /* IFLA_IPTUN_FLAGS */
1734 nla_total_size(4) +
Nicolas Dichtelcfa323b2012-11-14 05:13:58 +00001735 /* IFLA_IPTUN_PROTO */
1736 nla_total_size(1) +
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001737 0;
1738}
1739
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001740static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001741{
1742 struct ip6_tnl *tunnel = netdev_priv(dev);
1743 struct __ip6_tnl_parm *parm = &tunnel->parms;
1744
1745 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
Jiri Benc930345e2015-03-29 16:59:25 +02001746 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
1747 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001748 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1749 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1750 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
Nicolas Dichtelcfa323b2012-11-14 05:13:58 +00001751 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1752 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001753 goto nla_put_failure;
1754 return 0;
1755
1756nla_put_failure:
1757 return -EMSGSIZE;
1758}
1759
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01001760struct net *ip6_tnl_get_link_net(const struct net_device *dev)
1761{
1762 struct ip6_tnl *tunnel = netdev_priv(dev);
1763
1764 return tunnel->net;
1765}
1766EXPORT_SYMBOL(ip6_tnl_get_link_net);
1767
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001768static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1769 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1770 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1771 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1772 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1773 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1774 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1775 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1776 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1777};
1778
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001779static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1780 .kind = "ip6tnl",
1781 .maxtype = IFLA_IPTUN_MAX,
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001782 .policy = ip6_tnl_policy,
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001783 .priv_size = sizeof(struct ip6_tnl),
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001784 .setup = ip6_tnl_dev_setup,
1785 .validate = ip6_tnl_validate,
1786 .newlink = ip6_tnl_newlink,
1787 .changelink = ip6_tnl_changelink,
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001788 .dellink = ip6_tnl_dellink,
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001789 .get_size = ip6_tnl_get_size,
1790 .fill_info = ip6_tnl_fill_info,
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01001791 .get_link_net = ip6_tnl_get_link_net,
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001792};
1793
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001794static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001795 .handler = ip4ip6_rcv,
1796 .err_handler = ip4ip6_err,
1797 .priority = 1,
1798};
1799
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001800static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
Patrick McHardy03037702005-07-19 14:03:34 -07001801 .handler = ip6ip6_rcv,
1802 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08001803 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804};
1805
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001806static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001807{
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001808 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001809 struct net_device *dev, *aux;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001810 int h;
1811 struct ip6_tnl *t;
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001812 LIST_HEAD(list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001813
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001814 for_each_netdev_safe(net, dev, aux)
1815 if (dev->rtnl_link_ops == &ip6_link_ops)
1816 unregister_netdevice_queue(dev, &list);
1817
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001818 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet94767632010-09-15 20:25:34 +00001819 t = rtnl_dereference(ip6n->tnls_r_l[h]);
Ian Morris53b24b82015-03-29 14:00:05 +01001820 while (t) {
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001821 /* If dev is in the same netns, it has already
1822 * been added to the list by the previous loop.
1823 */
1824 if (!net_eq(dev_net(t->dev), net))
1825 unregister_netdevice_queue(t->dev, &list);
Eric Dumazet94767632010-09-15 20:25:34 +00001826 t = rtnl_dereference(t->next);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001827 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001828 }
1829
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001830 unregister_netdevice_many(&list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001831}
1832
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001833static int __net_init ip6_tnl_init_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001834{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001835 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Josh Boyer731abb92011-11-10 15:10:23 +00001836 struct ip6_tnl *t = NULL;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001837 int err;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001838
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001839 ip6n->tnls[0] = ip6n->tnls_wc;
1840 ip6n->tnls[1] = ip6n->tnls_r_l;
1841
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001842 err = -ENOMEM;
1843 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
Tom Gundersenc835a672014-07-14 16:37:24 +02001844 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001845
1846 if (!ip6n->fb_tnl_dev)
1847 goto err_alloc_dev;
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001848 dev_net_set(ip6n->fb_tnl_dev, net);
Nicolas Dichtelbb814092013-10-01 18:05:00 +02001849 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001850 /* FB netdevice is special: we have one, and only one per netns.
1851 * Allowing to move it to another netns is clearly unsafe.
1852 */
1853 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001854
Eric Dumazet8560f222010-09-28 03:23:34 +00001855 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1856 if (err < 0)
1857 goto err_register;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001858
1859 err = register_netdev(ip6n->fb_tnl_dev);
1860 if (err < 0)
1861 goto err_register;
Josh Boyer731abb92011-11-10 15:10:23 +00001862
1863 t = netdev_priv(ip6n->fb_tnl_dev);
1864
1865 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001866 return 0;
1867
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001868err_register:
Eric Dumazet8560f222010-09-28 03:23:34 +00001869 ip6_dev_free(ip6n->fb_tnl_dev);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001870err_alloc_dev:
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001871 return err;
1872}
1873
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001874static void __net_exit ip6_tnl_exit_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001875{
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001876 rtnl_lock();
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001877 ip6_tnl_destroy_tunnels(net);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001878 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001879}
1880
1881static struct pernet_operations ip6_tnl_net_ops = {
1882 .init = ip6_tnl_init_net,
1883 .exit = ip6_tnl_exit_net,
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001884 .id = &ip6_tnl_net_id,
1885 .size = sizeof(struct ip6_tnl_net),
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001886};
1887
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888/**
1889 * ip6_tunnel_init - register protocol and reserve needed resources
1890 *
1891 * Return: 0 on success
1892 **/
1893
1894static int __init ip6_tunnel_init(void)
1895{
1896 int err;
1897
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001898 err = register_pernet_device(&ip6_tnl_net_ops);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001899 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001900 goto out_pernet;
1901
1902 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1903 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00001904 pr_err("%s: can't register ip4ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001905 goto out_ip4ip6;
1906 }
1907
1908 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1909 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00001910 pr_err("%s: can't register ip6ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001911 goto out_ip6ip6;
1912 }
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001913 err = rtnl_link_register(&ip6_link_ops);
1914 if (err < 0)
1915 goto rtnl_link_failed;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001916
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917 return 0;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001918
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001919rtnl_link_failed:
1920 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001921out_ip6ip6:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001922 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001923out_ip4ip6:
1924 unregister_pernet_device(&ip6_tnl_net_ops);
1925out_pernet:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 return err;
1927}
1928
1929/**
1930 * ip6_tunnel_cleanup - free resources and unregister protocol
1931 **/
1932
1933static void __exit ip6_tunnel_cleanup(void)
1934{
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001935 rtnl_link_unregister(&ip6_link_ops);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001936 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Joe Perchesf3213832012-05-15 14:11:53 +00001937 pr_info("%s: can't deregister ip4ip6\n", __func__);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001938
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001939 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Joe Perchesf3213832012-05-15 14:11:53 +00001940 pr_info("%s: can't deregister ip6ip6\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001942 unregister_pernet_device(&ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943}
1944
1945module_init(ip6_tunnel_init);
1946module_exit(ip6_tunnel_cleanup);