blob: 1f20345cbc970e88dd3b1ace2cc111cb56e5f73b [file] [log] [blame]
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900126 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900127 * @remote: the address of the tunnel exit-point
128 * @local: the address of the tunnel entry-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900130 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 * tunnel matching given end-points if found,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900132 * else fallback tunnel if its device is up,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 * else %NULL
134 **/
135
Eric Dumazet2922bc82009-10-23 06:34:34 +0000136#define for_each_ip6_tunnel_rcu(start) \
137 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139static struct ip6_tnl *
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000140ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
Eric Dumazetddbe5032012-07-18 08:11:12 +0000142 unsigned int hash = HASH(remote, local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 struct ip6_tnl *t;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700144 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Steffen Klassertea3dc962014-11-05 08:03:50 +0100145 struct in6_addr any;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Eric Dumazetddbe5032012-07-18 08:11:12 +0000147 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 if (ipv6_addr_equal(local, &t->parms.laddr) &&
149 ipv6_addr_equal(remote, &t->parms.raddr) &&
150 (t->dev->flags & IFF_UP))
151 return t;
152 }
Steffen Klassertea3dc962014-11-05 08:03:50 +0100153
154 memset(&any, 0, sizeof(any));
155 hash = HASH(&any, local);
156 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
157 if (ipv6_addr_equal(local, &t->parms.laddr) &&
158 (t->dev->flags & IFF_UP))
159 return t;
160 }
161
162 hash = HASH(remote, &any);
163 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
164 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
165 (t->dev->flags & IFF_UP))
166 return t;
167 }
168
Eric Dumazet2922bc82009-10-23 06:34:34 +0000169 t = rcu_dereference(ip6n->tnls_wc[0]);
170 if (t && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 return t;
172
173 return NULL;
174}
175
176/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900177 * ip6_tnl_bucket - get head of list matching given tunnel parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900178 * @p: parameters containing tunnel end-points
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 *
180 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900181 * ip6_tnl_bucket() returns the head of the list matching the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 * &struct in6_addr entries laddr and raddr in @p.
183 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900184 * Return: head of IPv6 tunnel list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 **/
186
Eric Dumazet94767632010-09-15 20:25:34 +0000187static struct ip6_tnl __rcu **
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000188ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000190 const struct in6_addr *remote = &p->raddr;
191 const struct in6_addr *local = &p->laddr;
Eric Dumazet95c96172012-04-15 05:58:06 +0000192 unsigned int h = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 int prio = 0;
194
195 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
196 prio = 1;
Eric Dumazetddbe5032012-07-18 08:11:12 +0000197 h = HASH(remote, local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700199 return &ip6n->tnls[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
201
202/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900203 * ip6_tnl_link - add tunnel to hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 * @t: tunnel to be added
205 **/
206
207static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700208ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Eric Dumazet94767632010-09-15 20:25:34 +0000210 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Eric Dumazetcf778b02012-01-12 04:41:32 +0000212 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
213 rcu_assign_pointer(*tp, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214}
215
216/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900217 * ip6_tnl_unlink - remove tunnel from hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 * @t: tunnel to be removed
219 **/
220
221static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700222ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
Eric Dumazet94767632010-09-15 20:25:34 +0000224 struct ip6_tnl __rcu **tp;
225 struct ip6_tnl *iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
Eric Dumazet94767632010-09-15 20:25:34 +0000227 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
228 (iter = rtnl_dereference(*tp)) != NULL;
229 tp = &iter->next) {
230 if (t == iter) {
Eric Dumazetcf778b02012-01-12 04:41:32 +0000231 rcu_assign_pointer(*tp, t->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 break;
233 }
234 }
235}
236
Eric Dumazet8560f222010-09-28 03:23:34 +0000237static void ip6_dev_free(struct net_device *dev)
238{
Martin KaFai Laucdf34642015-09-15 14:30:07 -0700239 struct ip6_tnl *t = netdev_priv(dev);
240
Paolo Abeni607f7252016-02-12 15:43:54 +0100241 dst_cache_destroy(&t->dst_cache);
Eric Dumazet8560f222010-09-28 03:23:34 +0000242 free_percpu(dev->tstats);
243 free_netdev(dev);
244}
245
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000246static int ip6_tnl_create2(struct net_device *dev)
247{
248 struct ip6_tnl *t = netdev_priv(dev);
249 struct net *net = dev_net(dev);
250 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
251 int err;
252
253 t = netdev_priv(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000254
Thadeu Lima de Souza Cascardob6ee3762016-04-01 17:17:50 -0300255 dev->rtnl_link_ops = &ip6_link_ops;
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000256 err = register_netdevice(dev);
257 if (err < 0)
258 goto out;
259
260 strcpy(t->parms.name, dev->name);
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000261
262 dev_hold(dev);
263 ip6_tnl_link(ip6n, t);
264 return 0;
265
266out:
267 return err;
268}
269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000271 * ip6_tnl_create - create a new tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 * @p: tunnel parameters
273 * @pt: pointer to new tunnel
274 *
275 * Description:
276 * Create tunnel matching given parameters.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900277 *
278 * Return:
Nicolas Dichtel37355562015-03-16 15:56:05 +0100279 * created tunnel or error pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 **/
281
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000282static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283{
284 struct net_device *dev;
285 struct ip6_tnl *t;
286 char name[IFNAMSIZ];
Nicolas Dichtel37355562015-03-16 15:56:05 +0100287 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800289 if (p->name[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 strlcpy(name, p->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800291 else
292 sprintf(name, "ip6tnl%%d");
293
Tom Gundersenc835a672014-07-14 16:37:24 +0200294 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
295 ip6_tnl_dev_setup);
Ian Morris63159f22015-03-29 14:00:04 +0100296 if (!dev)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800297 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Pavel Emelyanov554eb272008-04-16 01:24:13 -0700299 dev_net_set(dev, net);
300
Patrick McHardy2941a482006-01-08 22:05:26 -0800301 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 t->parms = *p;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200303 t->net = dev_net(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000304 err = ip6_tnl_create2(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +0000305 if (err < 0)
306 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
Ville Nuorvala567131a2006-11-24 17:05:41 -0800308 return t;
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800309
310failed_free:
Eric Dumazet8560f222010-09-28 03:23:34 +0000311 ip6_dev_free(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800312failed:
Nicolas Dichtel37355562015-03-16 15:56:05 +0100313 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314}
315
316/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900317 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900318 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 * @create: != 0 if allowed to create new tunnel if no match found
320 *
321 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900322 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 * based on @parms. If this is unsuccessful, but @create is set a new
324 * tunnel device is created and registered for use.
325 *
326 * Return:
Nicolas Dichtel37355562015-03-16 15:56:05 +0100327 * matching tunnel or error pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 **/
329
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700330static struct ip6_tnl *ip6_tnl_locate(struct net *net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000331 struct __ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000333 const struct in6_addr *remote = &p->raddr;
334 const struct in6_addr *local = &p->laddr;
Eric Dumazet94767632010-09-15 20:25:34 +0000335 struct ip6_tnl __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700337 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Eric Dumazet94767632010-09-15 20:25:34 +0000339 for (tp = ip6_tnl_bucket(ip6n, p);
340 (t = rtnl_dereference(*tp)) != NULL;
341 tp = &t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Steffen Klassert2b0bb012014-09-22 10:07:24 +0200343 ipv6_addr_equal(remote, &t->parms.raddr)) {
344 if (create)
Nicolas Dichtel37355562015-03-16 15:56:05 +0100345 return ERR_PTR(-EEXIST);
Steffen Klassert2b0bb012014-09-22 10:07:24 +0200346
Ville Nuorvala567131a2006-11-24 17:05:41 -0800347 return t;
Steffen Klassert2b0bb012014-09-22 10:07:24 +0200348 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 }
350 if (!create)
Nicolas Dichtel37355562015-03-16 15:56:05 +0100351 return ERR_PTR(-ENODEV);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700352 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353}
354
355/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900356 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900358 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900360 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 **/
362
363static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900364ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
Patrick McHardy2941a482006-01-08 22:05:26 -0800366 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200367 struct net *net = t->net;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700368 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
Eric Dumazet94767632010-09-15 20:25:34 +0000370 if (dev == ip6n->fb_tnl_dev)
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000371 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
Eric Dumazet94767632010-09-15 20:25:34 +0000372 else
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700373 ip6_tnl_unlink(ip6n, t);
Paolo Abeni607f7252016-02-12 15:43:54 +0100374 dst_cache_reset(&t->dst_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 dev_put(dev);
376}
377
378/**
379 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
380 * @skb: received socket buffer
381 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900382 * Return:
383 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 * else index to encapsulation limit
385 **/
386
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000387__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000389 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 __u8 nexthdr = ipv6h->nexthdr;
Ian Morris67ba4152014-08-24 21:53:10 +0100391 __u16 off = sizeof(*ipv6h);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
394 __u16 optlen = 0;
395 struct ipv6_opt_hdr *hdr;
Ian Morris67ba4152014-08-24 21:53:10 +0100396 if (raw + off + sizeof(*hdr) > skb->data &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
398 break;
399
400 hdr = (struct ipv6_opt_hdr *) (raw + off);
401 if (nexthdr == NEXTHDR_FRAGMENT) {
402 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
403 if (frag_hdr->frag_off)
404 break;
405 optlen = 8;
406 } else if (nexthdr == NEXTHDR_AUTH) {
407 optlen = (hdr->hdrlen + 2) << 2;
408 } else {
409 optlen = ipv6_optlen(hdr);
410 }
411 if (nexthdr == NEXTHDR_DEST) {
412 __u16 i = off + 2;
413 while (1) {
414 struct ipv6_tlv_tnl_enc_lim *tel;
415
416 /* No more room for encapsulation limit */
417 if (i + sizeof (*tel) > off + optlen)
418 break;
419
420 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
421 /* return index of option if found and valid */
422 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
423 tel->length == 1)
424 return i;
425 /* else jump to next option */
426 if (tel->type)
427 i += tel->length + 2;
428 else
429 i++;
430 }
431 }
432 nexthdr = hdr->nexthdr;
433 off += optlen;
434 }
435 return 0;
436}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000437EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900440 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 *
442 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900443 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 * to the specifications in RFC 2473.
445 **/
446
Herbert Xud2acc342006-03-28 01:12:13 -0800447static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900448ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700449 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000451 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 struct ip6_tnl *t;
453 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700454 u8 rel_type = ICMPV6_DEST_UNREACH;
455 u8 rel_code = ICMPV6_ADDR_UNREACH;
Alexey Andriyanovacf722f2014-10-29 10:54:52 +0300456 u8 tproto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 __u32 rel_info = 0;
458 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800459 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900461 /* If the packet doesn't contain the original IPv6 header we are
462 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 processing of the error. */
464
Eric Dumazet2922bc82009-10-23 06:34:34 +0000465 rcu_read_lock();
Ian Morrise5d08d72014-11-23 21:28:43 +0000466 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
Ian Morris63159f22015-03-29 14:00:04 +0100467 if (!t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 goto out;
469
Alexey Andriyanovacf722f2014-10-29 10:54:52 +0300470 tproto = ACCESS_ONCE(t->parms.proto);
471 if (tproto != ipproto && tproto != 0)
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900472 goto out;
473
Herbert Xud2acc342006-03-28 01:12:13 -0800474 err = 0;
475
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900476 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 __u32 teli;
478 struct ipv6_tlv_tnl_enc_lim *tel;
479 __u32 mtu;
480 case ICMPV6_DEST_UNREACH:
Matt Bennett17a10c92015-09-25 11:01:47 +1200481 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
482 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 rel_msg = 1;
484 break;
485 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900486 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Matt Bennett17a10c92015-09-25 11:01:47 +1200487 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
488 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 rel_msg = 1;
490 }
491 break;
492 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800493 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900494 if ((*code) == ICMPV6_HDR_FIELD)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000495 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Al Viro704eae12007-07-26 17:33:29 +0100497 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
499 if (tel->encap_limit == 0) {
Matt Bennett17a10c92015-09-25 11:01:47 +1200500 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
501 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 rel_msg = 1;
503 }
Joe Perchese87cc472012-05-13 21:56:26 +0000504 } else {
Matt Bennett17a10c92015-09-25 11:01:47 +1200505 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
506 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 }
508 break;
509 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100510 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 if (mtu < IPV6_MIN_MTU)
512 mtu = IPV6_MIN_MTU;
513 t->dev->mtu = mtu;
514
Ian Morrise5d08d72014-11-23 21:28:43 +0000515 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
516 if (len > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 rel_type = ICMPV6_PKT_TOOBIG;
518 rel_code = 0;
519 rel_info = mtu;
520 rel_msg = 1;
521 }
522 break;
523 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900524
525 *type = rel_type;
526 *code = rel_code;
527 *info = rel_info;
528 *msg = rel_msg;
529
530out:
Eric Dumazet2922bc82009-10-23 06:34:34 +0000531 rcu_read_unlock();
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900532 return err;
533}
534
535static int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900536ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700537 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900538{
539 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700540 u8 rel_type = type;
541 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100542 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900543 int err;
544 struct sk_buff *skb2;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000545 const struct iphdr *eiph;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900546 struct rtable *rt;
David S. Miller31e45432011-05-03 20:25:42 -0700547 struct flowi4 fl4;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900548
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900549 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
550 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900551 if (err < 0)
552 return err;
553
554 if (rel_msg == 0)
555 return 0;
556
557 switch (rel_type) {
558 case ICMPV6_DEST_UNREACH:
559 if (rel_code != ICMPV6_ADDR_UNREACH)
560 return 0;
561 rel_type = ICMP_DEST_UNREACH;
562 rel_code = ICMP_HOST_UNREACH;
563 break;
564 case ICMPV6_PKT_TOOBIG:
565 if (rel_code != 0)
566 return 0;
567 rel_type = ICMP_DEST_UNREACH;
568 rel_code = ICMP_FRAG_NEEDED;
569 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700570 case NDISC_REDIRECT:
571 rel_type = ICMP_REDIRECT;
572 rel_code = ICMP_REDIR_HOST;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900573 default:
574 return 0;
575 }
576
577 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
578 return 0;
579
580 skb2 = skb_clone(skb, GFP_ATOMIC);
581 if (!skb2)
582 return 0;
583
Eric Dumazetadf30902009-06-02 05:19:30 +0000584 skb_dst_drop(skb2);
585
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900586 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700587 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700588 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900589
590 /* Try to guess incoming interface */
David S. Miller31e45432011-05-03 20:25:42 -0700591 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500592 eiph->saddr, 0,
593 0, 0,
594 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800595 if (IS_ERR(rt))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900596 goto out;
597
Changli Gaod8d1f302010-06-10 23:31:35 -0700598 skb2->dev = rt->dst.dev;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900599
600 /* route "incoming" packet */
601 if (rt->rt_flags & RTCF_LOCAL) {
602 ip_rt_put(rt);
603 rt = NULL;
David S. Miller31e45432011-05-03 20:25:42 -0700604 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500605 eiph->daddr, eiph->saddr,
606 0, 0,
607 IPPROTO_IPIP,
608 RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800609 if (IS_ERR(rt) ||
Changli Gaod8d1f302010-06-10 23:31:35 -0700610 rt->dst.dev->type != ARPHRD_TUNNEL) {
David S. Millerb23dd4f2011-03-02 14:31:35 -0800611 if (!IS_ERR(rt))
612 ip_rt_put(rt);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900613 goto out;
614 }
David S. Millerb23dd4f2011-03-02 14:31:35 -0800615 skb_dst_set(skb2, &rt->dst);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900616 } else {
617 ip_rt_put(rt);
618 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
619 skb2->dev) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000620 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900621 goto out;
622 }
623
624 /* change mtu on this route */
625 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000626 if (rel_info > dst_mtu(skb_dst(skb2)))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900627 goto out;
628
David S. Miller6700c272012-07-17 03:29:28 -0700629 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900630 }
David S. Miller1ed5c482012-07-12 00:41:25 -0700631 if (rel_type == ICMP_REDIRECT)
David S. Miller6700c272012-07-17 03:29:28 -0700632 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900633
Al Viro704eae12007-07-26 17:33:29 +0100634 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900635
636out:
637 kfree_skb(skb2);
638 return 0;
639}
640
641static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900642ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700643 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900644{
645 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700646 u8 rel_type = type;
647 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100648 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900649 int err;
650
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900651 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
652 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900653 if (err < 0)
654 return err;
655
656 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 struct rt6_info *rt;
658 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900661 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Eric Dumazetadf30902009-06-02 05:19:30 +0000663 skb_dst_drop(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700665 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
667 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700668 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
669 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
David S. Millerd1918542011-12-28 20:19:20 -0500671 if (rt && rt->dst.dev)
672 skb2->dev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000674 icmpv6_send(skb2, rel_type, rel_code, rel_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
Amerigo Wang94e187c2012-10-29 00:13:19 +0000676 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
678 kfree_skb(skb2);
679 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900680
681 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000684static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
685 const struct ipv6hdr *ipv6h,
686 struct sk_buff *skb)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900687{
688 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
689
690 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700691 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900692
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000693 return IP6_ECN_decapsulate(ipv6h, skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900694}
695
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000696static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
697 const struct ipv6hdr *ipv6h,
698 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900700 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b42007-11-13 21:40:13 -0800701 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000703 return IP6_ECN_decapsulate(ipv6h, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900705
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000706__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000707 const struct in6_addr *laddr,
708 const struct in6_addr *raddr)
709{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000710 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000711 int ltype = ipv6_addr_type(laddr);
712 int rtype = ipv6_addr_type(raddr);
713 __u32 flags = 0;
714
715 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
716 flags = IP6_TNL_F_CAP_PER_PACKET;
717 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
718 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
719 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
720 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
721 if (ltype&IPV6_ADDR_UNICAST)
722 flags |= IP6_TNL_F_CAP_XMIT;
723 if (rtype&IPV6_ADDR_UNICAST)
724 flags |= IP6_TNL_F_CAP_RCV;
725 }
726 return flags;
727}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000728EXPORT_SYMBOL(ip6_tnl_get_cap);
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000729
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100730/* called with rcu_read_lock() */
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000731int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000732 const struct in6_addr *laddr,
733 const struct in6_addr *raddr)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800734{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000735 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800736 int ret = 0;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200737 struct net *net = t->net;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800738
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000739 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
740 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
741 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900742 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800743
744 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100745 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800746
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000747 if ((ipv6_addr_is_multicast(laddr) ||
748 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
749 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800750 ret = 1;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800751 }
752 return ret;
753}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000754EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
756/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900757 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 * @skb: received socket buffer
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900759 * @protocol: ethernet protocol ID
760 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 *
762 * Return: 0
763 **/
764
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900765static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900766 __u8 ipproto,
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000767 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
768 const struct ipv6hdr *ipv6h,
769 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 struct ip6_tnl *t;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000772 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Alexey Andriyanovacf722f2014-10-29 10:54:52 +0300773 u8 tproto;
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000774 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
Eric Dumazet2922bc82009-10-23 06:34:34 +0000776 rcu_read_lock();
Ian Morrise5d08d72014-11-23 21:28:43 +0000777 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
Ian Morris53b24b82015-03-29 14:00:05 +0100778 if (t) {
Li RongQing8f849852014-01-04 13:57:59 +0800779 struct pcpu_sw_netstats *tstats;
Eric Dumazet8560f222010-09-28 03:23:34 +0000780
Alexey Andriyanovacf722f2014-10-29 10:54:52 +0300781 tproto = ACCESS_ONCE(t->parms.proto);
782 if (tproto != ipproto && tproto != 0) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000783 rcu_read_unlock();
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900784 goto discard;
785 }
786
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000788 rcu_read_unlock();
Herbert Xu50fba2a2006-04-04 13:50:45 -0700789 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 }
791
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000792 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700793 t->dev->stats.rx_dropped++;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000794 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 goto discard;
796 }
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700797 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700798 skb_reset_network_header(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900799 skb->protocol = htons(protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700801
Nicolas Dichtelea231922013-09-02 15:34:58 +0200802 __skb_tunnel_rx(skb, t->dev, t->net);
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000803
804 err = dscp_ecn_decapsulate(t, ipv6h, skb);
805 if (unlikely(err)) {
806 if (log_ecn_error)
807 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
808 &ipv6h->saddr,
809 ipv6_get_dsfield(ipv6h));
810 if (err > 1) {
811 ++t->dev->stats.rx_frame_errors;
812 ++t->dev->stats.rx_errors;
813 rcu_read_unlock();
814 goto discard;
815 }
816 }
817
Eric Dumazet8560f222010-09-28 03:23:34 +0000818 tstats = this_cpu_ptr(t->dev->tstats);
Li RongQingabb60132014-01-02 13:20:12 +0800819 u64_stats_update_begin(&tstats->syncp);
Eric Dumazet8560f222010-09-28 03:23:34 +0000820 tstats->rx_packets++;
821 tstats->rx_bytes += skb->len;
Li RongQingabb60132014-01-02 13:20:12 +0800822 u64_stats_update_end(&tstats->syncp);
Eric Dumazet8560f222010-09-28 03:23:34 +0000823
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000824 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000825
Eric Dumazet2922bc82009-10-23 06:34:34 +0000826 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 return 0;
828 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000829 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 return 1;
Herbert Xu50fba2a2006-04-04 13:50:45 -0700831
832discard:
833 kfree_skb(skb);
834 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835}
836
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900837static int ip4ip6_rcv(struct sk_buff *skb)
838{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900839 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
840 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900841}
842
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900843static int ip6ip6_rcv(struct sk_buff *skb)
844{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900845 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
846 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900847}
848
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800849struct ipv6_tel_txoption {
850 struct ipv6_txoptions ops;
851 __u8 dst_opt[8];
852};
853
854static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800856 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800858 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
859 opt->dst_opt[3] = 1;
860 opt->dst_opt[4] = encap_limit;
861 opt->dst_opt[5] = IPV6_TLV_PADN;
862 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800864 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
865 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866}
867
868/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900869 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900871 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 *
873 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900874 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 * doesn't match source of incoming packet.
876 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900877 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 * 1 if conflict,
879 * 0 else
880 **/
881
Eric Dumazet92113bf2012-05-18 08:14:11 +0200882static inline bool
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000883ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884{
885 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
886}
887
Steffen Klassertd5005142014-11-05 08:02:48 +0100888int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
889 const struct in6_addr *laddr,
890 const struct in6_addr *raddr)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800891{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000892 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800893 int ret = 0;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200894 struct net *net = t->net;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800895
Steffen Klassertd5005142014-11-05 08:02:48 +0100896 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
897 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
898 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800899 struct net_device *ldev = NULL;
900
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100901 rcu_read_lock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800902 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100903 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800904
Steffen Klassertd5005142014-11-05 08:02:48 +0100905 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000906 pr_warn("%s xmit: Local address not yet configured!\n",
907 p->name);
Steffen Klassertd5005142014-11-05 08:02:48 +0100908 else if (!ipv6_addr_is_multicast(raddr) &&
909 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000910 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
911 p->name);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800912 else
913 ret = 1;
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100914 rcu_read_unlock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800915 }
916 return ret;
917}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000918EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
919
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920/**
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900921 * ip6_tnl_xmit2 - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900923 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900924 * @dsfield: dscp code for outer header
925 * @fl: flow of tunneled packet
926 * @encap_limit: encapsulation limit
927 * @pmtu: Path MTU is stored if packet is too big
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 *
929 * Description:
930 * Build new header and do some sanity checks on the packet before sending
931 * it.
932 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900933 * Return:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900934 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900935 * -1 fail
936 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 **/
938
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900939static int ip6_tnl_xmit2(struct sk_buff *skb,
940 struct net_device *dev,
941 __u8 dsfield,
David S. Miller4c9483b2011-03-12 16:22:43 -0500942 struct flowi6 *fl6,
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900943 int encap_limit,
944 __u32 *pmtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945{
Patrick McHardy2941a482006-01-08 22:05:26 -0800946 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200947 struct net *net = t->net;
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700948 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700949 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800950 struct ipv6_tel_txoption opt;
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400951 struct dst_entry *dst = NULL, *ndst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 struct net_device *tdev;
953 int mtu;
Chuck Leverc2636b42007-10-23 21:07:32 -0700954 unsigned int max_headroom = sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 u8 proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900956 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
Steffen Klassertea3dc962014-11-05 08:03:50 +0100958 /* NBMA tunnel */
959 if (ipv6_addr_any(&t->parms.raddr)) {
960 struct in6_addr *addr6;
961 struct neighbour *neigh;
962 int addr_type;
963
964 if (!skb_dst(skb))
965 goto tx_err_link_failure;
966
967 neigh = dst_neigh_lookup(skb_dst(skb),
968 &ipv6_hdr(skb)->daddr);
969 if (!neigh)
970 goto tx_err_link_failure;
971
972 addr6 = (struct in6_addr *)&neigh->primary_key;
973 addr_type = ipv6_addr_type(addr6);
974
975 if (addr_type == IPV6_ADDR_ANY)
976 addr6 = &ipv6_hdr(skb)->daddr;
977
978 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
979 neigh_release(neigh);
980 } else if (!fl6->flowi6_mark)
Paolo Abeni607f7252016-02-12 15:43:54 +0100981 dst = dst_cache_get(&t->dst_cache);
Steffen Klassertd5005142014-11-05 08:02:48 +0100982
983 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
984 goto tx_err_link_failure;
985
Eric Dumazet89b02122011-07-28 04:32:25 +0000986 if (!dst) {
Martin KaFai Laucdf34642015-09-15 14:30:07 -0700987 dst = ip6_route_output(net, NULL, fl6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
Martin KaFai Laucdf34642015-09-15 14:30:07 -0700989 if (dst->error)
Patrick McHardya57ebc92005-09-08 14:27:47 -0700990 goto tx_err_link_failure;
Martin KaFai Laucdf34642015-09-15 14:30:07 -0700991 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
992 if (IS_ERR(dst)) {
993 err = PTR_ERR(dst);
994 dst = NULL;
David S. Miller452edd52011-03-02 13:27:41 -0800995 goto tx_err_link_failure;
996 }
Martin KaFai Laucdf34642015-09-15 14:30:07 -0700997 ndst = dst;
Patrick McHardya57ebc92005-09-08 14:27:47 -0700998 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
1000 tdev = dst->dev;
1001
1002 if (tdev == dev) {
1003 stats->collisions++;
Joe Perchese87cc472012-05-13 21:56:26 +00001004 net_warn_ratelimited("%s: Local routing loop detected!\n",
1005 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 goto tx_err_dst_release;
1007 }
Ian Morris67ba4152014-08-24 21:53:10 +01001008 mtu = dst_mtu(dst) - sizeof(*ipv6h);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -08001009 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 max_headroom += 8;
1011 mtu -= 8;
1012 }
1013 if (mtu < IPV6_MIN_MTU)
1014 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +00001015 if (skb_dst(skb))
David S. Miller6700c272012-07-17 03:29:28 -07001016 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 if (skb->len > mtu) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001018 *pmtu = mtu;
1019 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 goto tx_err_dst_release;
1021 }
1022
Nicolas Dichtel963a88b2013-09-02 15:34:57 +02001023 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001024
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 /*
1026 * Okay, now see if we can stuff it in the buffer as-is.
1027 */
1028 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001029
Patrick McHardycfbba492007-07-09 15:33:40 -07001030 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1031 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001033
Ian Morrise5d08d72014-11-23 21:28:43 +00001034 new_skb = skb_realloc_headroom(skb, max_headroom);
1035 if (!new_skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 goto tx_err_dst_release;
1037
1038 if (skb->sk)
1039 skb_set_owner_w(new_skb, skb->sk);
Eric Dumazet9ff26442012-04-19 02:24:17 +00001040 consume_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 skb = new_skb;
1042 }
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001043
1044 if (!fl6->flowi6_mark && ndst)
Paolo Abeni607f7252016-02-12 15:43:54 +01001045 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001046 skb_dst_set(skb, dst);
1047
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07001048 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
David S. Miller4c9483b2011-03-12 16:22:43 -05001050 proto = fl6->flowi6_proto;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -08001051 if (encap_limit >= 0) {
1052 init_tel_txopt(&opt, encap_limit);
1053 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1054 }
Hannes Frederic Sowa3d483052013-08-18 13:46:52 +02001055
1056 if (likely(!skb->encapsulation)) {
1057 skb_reset_inner_headers(skb);
1058 skb->encapsulation = 1;
1059 }
1060
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -07001061 skb_push(skb, sizeof(struct ipv6hdr));
1062 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001063 ipv6h = ipv6_hdr(skb);
Tom Herbertcb1ce2e2014-07-01 21:33:10 -07001064 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
Tom Herbert42240902015-07-31 16:52:12 -07001065 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 ipv6h->hop_limit = t->parms.hop_limit;
1067 ipv6h->nexthdr = proto;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001068 ipv6h->saddr = fl6->saddr;
1069 ipv6h->daddr = fl6->daddr;
David Miller79b16aa2015-04-05 22:19:09 -04001070 ip6tunnel_xmit(NULL, skb, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 return 0;
1072tx_err_link_failure:
1073 stats->tx_carrier_errors++;
1074 dst_link_failure(skb);
1075tx_err_dst_release:
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001076 dst_release(dst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001077 return err;
1078}
1079
1080static inline int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001081ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1082{
1083 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001084 const struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001085 int encap_limit = -1;
David S. Miller4c9483b2011-03-12 16:22:43 -05001086 struct flowi6 fl6;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001087 __u8 dsfield;
1088 __u32 mtu;
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001089 u8 tproto;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001090 int err;
1091
Bernie Harris5146d1f2016-02-22 12:58:05 +13001092 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1093
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001094 tproto = ACCESS_ONCE(t->parms.proto);
Steffen Klassertd5005142014-11-05 08:02:48 +01001095 if (tproto != IPPROTO_IPIP && tproto != 0)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001096 return -1;
1097
1098 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1099 encap_limit = t->parms.encap_limit;
1100
Ian Morris67ba4152014-08-24 21:53:10 +01001101 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
David S. Miller4c9483b2011-03-12 16:22:43 -05001102 fl6.flowi6_proto = IPPROTO_IPIP;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001103
1104 dsfield = ipv4_get_dsfield(iph);
1105
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001106 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001107 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
Al Virob77f2fa2007-07-21 19:09:41 -07001108 & IPV6_TCLASS_MASK;
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001109 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1110 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001111
David S. Miller4c9483b2011-03-12 16:22:43 -05001112 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001113 if (err != 0) {
1114 /* XXX: send ICMP error even if DF is not set. */
1115 if (err == -EMSGSIZE)
1116 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1117 htonl(mtu));
1118 return -1;
1119 }
1120
1121 return 0;
1122}
1123
1124static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001125ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1126{
1127 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001128 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001129 int encap_limit = -1;
1130 __u16 offset;
David S. Miller4c9483b2011-03-12 16:22:43 -05001131 struct flowi6 fl6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001132 __u8 dsfield;
1133 __u32 mtu;
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001134 u8 tproto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001135 int err;
1136
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001137 tproto = ACCESS_ONCE(t->parms.proto);
1138 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
Steffen Klassertd5005142014-11-05 08:02:48 +01001139 ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001140 return -1;
1141
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001142 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001143 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001144 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001145 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001146 if (tel->encap_limit == 0) {
1147 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001148 ICMPV6_HDR_FIELD, offset + 2);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001149 return -1;
1150 }
1151 encap_limit = tel->encap_limit - 1;
1152 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1153 encap_limit = t->parms.encap_limit;
1154
Ian Morris67ba4152014-08-24 21:53:10 +01001155 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
David S. Miller4c9483b2011-03-12 16:22:43 -05001156 fl6.flowi6_proto = IPPROTO_IPV6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001157
1158 dsfield = ipv6_get_dsfield(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001159 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001160 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001161 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
Florent Fourcot3308de22013-12-08 15:47:00 +01001162 fl6.flowlabel |= ip6_flowlabel(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001163 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1164 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001165
David S. Miller4c9483b2011-03-12 16:22:43 -05001166 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001167 if (err != 0) {
1168 if (err == -EMSGSIZE)
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001169 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001170 return -1;
1171 }
1172
1173 return 0;
1174}
1175
Stephen Hemminger6fef4c02009-08-31 19:50:41 +00001176static netdev_tx_t
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001177ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1178{
1179 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001180 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001181 int ret;
1182
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001183 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001184 case htons(ETH_P_IP):
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001185 ret = ip4ip6_tnl_xmit(skb, dev);
1186 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001187 case htons(ETH_P_IPV6):
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001188 ret = ip6ip6_tnl_xmit(skb, dev);
1189 break;
1190 default:
1191 goto tx_err;
1192 }
1193
1194 if (ret < 0)
1195 goto tx_err;
1196
Patrick McHardy6ed10652009-06-23 06:03:08 +00001197 return NETDEV_TX_OK;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001198
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199tx_err:
1200 stats->tx_errors++;
1201 stats->tx_dropped++;
1202 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +00001203 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204}
1205
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001206static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207{
1208 struct net_device *dev = t->dev;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001209 struct __ip6_tnl_parm *p = &t->parms;
David S. Miller4c9483b2011-03-12 16:22:43 -05001210 struct flowi6 *fl6 = &t->fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
Jiri Pirko3a6d54c2009-05-11 23:37:15 +00001212 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1213 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
1215 /* Set up flowi template */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001216 fl6->saddr = p->laddr;
1217 fl6->daddr = p->raddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001218 fl6->flowi6_oif = p->link;
1219 fl6->flowlabel = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220
1221 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001222 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001224 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001226 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1227 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228
1229 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1230 dev->flags |= IFF_POINTOPOINT;
1231 else
1232 dev->flags &= ~IFF_POINTOPOINT;
1233
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001235 int strict = (ipv6_addr_type(&p->raddr) &
1236 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1237
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001238 struct rt6_info *rt = rt6_lookup(t->net,
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001239 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001240 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241
Ian Morris63159f22015-03-29 14:00:04 +01001242 if (!rt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 return;
1244
David S. Millerd1918542011-12-28 20:19:20 -05001245 if (rt->dst.dev) {
1246 dev->hard_header_len = rt->dst.dev->hard_header_len +
Ian Morris67ba4152014-08-24 21:53:10 +01001247 sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248
Ian Morris67ba4152014-08-24 21:53:10 +01001249 dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001250 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
Ian Morris67ba4152014-08-24 21:53:10 +01001251 dev->mtu -= 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252
1253 if (dev->mtu < IPV6_MIN_MTU)
1254 dev->mtu = IPV6_MIN_MTU;
1255 }
Amerigo Wang94e187c2012-10-29 00:13:19 +00001256 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 }
1258}
1259
1260/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001261 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 * @t: tunnel to be changed
1263 * @p: tunnel configuration parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 *
1265 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001266 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 **/
1268
1269static int
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001270ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271{
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001272 t->parms.laddr = p->laddr;
1273 t->parms.raddr = p->raddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 t->parms.flags = p->flags;
1275 t->parms.hop_limit = p->hop_limit;
1276 t->parms.encap_limit = p->encap_limit;
1277 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001278 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001279 t->parms.proto = p->proto;
Paolo Abeni607f7252016-02-12 15:43:54 +01001280 dst_cache_reset(&t->dst_cache);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001281 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 return 0;
1283}
1284
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001285static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1286{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001287 struct net *net = t->net;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001288 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1289 int err;
1290
1291 ip6_tnl_unlink(ip6n, t);
1292 synchronize_net();
1293 err = ip6_tnl_change(t, p);
1294 ip6_tnl_link(ip6n, t);
1295 netdev_state_change(t->dev);
1296 return err;
1297}
1298
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001299static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1300{
1301 /* for default tnl0 device allow to change only the proto */
1302 t->parms.proto = p->proto;
1303 netdev_state_change(t->dev);
1304 return 0;
1305}
1306
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001307static void
1308ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1309{
1310 p->laddr = u->laddr;
1311 p->raddr = u->raddr;
1312 p->flags = u->flags;
1313 p->hop_limit = u->hop_limit;
1314 p->encap_limit = u->encap_limit;
1315 p->flowinfo = u->flowinfo;
1316 p->link = u->link;
1317 p->proto = u->proto;
1318 memcpy(p->name, u->name, sizeof(u->name));
1319}
1320
1321static void
1322ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1323{
1324 u->laddr = p->laddr;
1325 u->raddr = p->raddr;
1326 u->flags = p->flags;
1327 u->hop_limit = p->hop_limit;
1328 u->encap_limit = p->encap_limit;
1329 u->flowinfo = p->flowinfo;
1330 u->link = p->link;
1331 u->proto = p->proto;
1332 memcpy(u->name, p->name, sizeof(u->name));
1333}
1334
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001336 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 * @dev: virtual device associated with tunnel
1338 * @ifr: parameters passed from userspace
1339 * @cmd: command to be performed
1340 *
1341 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001342 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001343 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 *
1345 * The possible commands are the following:
1346 * %SIOCGETTUNNEL: get tunnel parameters for device
1347 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1348 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1349 * %SIOCDELTUNNEL: delete tunnel
1350 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001351 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 * initialization, can be used for creating other tunnel devices.
1353 *
1354 * Return:
1355 * 0 on success,
1356 * %-EFAULT if unable to copy data to or from userspace,
1357 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1358 * %-EINVAL if passed tunnel parameters are invalid,
1359 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1360 * %-ENODEV if attempting to change or delete a nonexisting device
1361 **/
1362
1363static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001364ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365{
1366 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 struct ip6_tnl_parm p;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001368 struct __ip6_tnl_parm p1;
Nicolas Dichtel74462f02014-04-16 11:19:34 +02001369 struct ip6_tnl *t = netdev_priv(dev);
1370 struct net *net = t->net;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001371 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372
1373 switch (cmd) {
1374 case SIOCGETTUNNEL:
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001375 if (dev == ip6n->fb_tnl_dev) {
Ian Morris67ba4152014-08-24 21:53:10 +01001376 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 err = -EFAULT;
1378 break;
1379 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001380 ip6_tnl_parm_from_user(&p1, &p);
1381 t = ip6_tnl_locate(net, &p1, 0);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001382 if (IS_ERR(t))
Nicolas Dichtel74462f02014-04-16 11:19:34 +02001383 t = netdev_priv(dev);
Dan Carpenter5ef5d6c2012-08-16 03:14:04 +00001384 } else {
1385 memset(&p, 0, sizeof(p));
Ville Nuorvala567131a2006-11-24 17:05:41 -08001386 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001387 ip6_tnl_parm_to_user(&p, &t->parms);
Ian Morris67ba4152014-08-24 21:53:10 +01001388 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 err = -EFAULT;
1390 }
1391 break;
1392 case SIOCADDTUNNEL:
1393 case SIOCCHGTUNNEL:
1394 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001395 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001397 err = -EFAULT;
Ian Morris67ba4152014-08-24 21:53:10 +01001398 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001400 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001401 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1402 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 break;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001404 ip6_tnl_parm_from_user(&p1, &p);
1405 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001406 if (cmd == SIOCCHGTUNNEL) {
Nicolas Dichtel37355562015-03-16 15:56:05 +01001407 if (!IS_ERR(t)) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001408 if (t->dev != dev) {
1409 err = -EEXIST;
1410 break;
1411 }
1412 } else
1413 t = netdev_priv(dev);
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001414 if (dev == ip6n->fb_tnl_dev)
1415 err = ip6_tnl0_update(t, &p1);
1416 else
1417 err = ip6_tnl_update(t, &p1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 }
Nicolas Dichtel37355562015-03-16 15:56:05 +01001419 if (!IS_ERR(t)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 err = 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001421 ip6_tnl_parm_to_user(&p, &t->parms);
1422 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
Ville Nuorvala567131a2006-11-24 17:05:41 -08001423 err = -EFAULT;
1424
Nicolas Dichtel37355562015-03-16 15:56:05 +01001425 } else {
1426 err = PTR_ERR(t);
1427 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 break;
1429 case SIOCDELTUNNEL:
1430 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001431 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 break;
1433
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001434 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001435 err = -EFAULT;
Ian Morris67ba4152014-08-24 21:53:10 +01001436 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001438 err = -ENOENT;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001439 ip6_tnl_parm_from_user(&p1, &p);
1440 t = ip6_tnl_locate(net, &p1, 0);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001441 if (IS_ERR(t))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001443 err = -EPERM;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001444 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001446 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001448 err = 0;
1449 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 break;
1451 default:
1452 err = -EINVAL;
1453 }
1454 return err;
1455}
1456
1457/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001458 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 * @dev: virtual device associated with tunnel
1460 * @new_mtu: the new mtu
1461 *
1462 * Return:
1463 * 0 on success,
1464 * %-EINVAL if mtu too small
1465 **/
1466
1467static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001468ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469{
Oussama Ghorbel582442d2013-10-03 14:49:26 +01001470 struct ip6_tnl *tnl = netdev_priv(dev);
1471
1472 if (tnl->parms.proto == IPPROTO_IPIP) {
1473 if (new_mtu < 68)
1474 return -EINVAL;
1475 } else {
1476 if (new_mtu < IPV6_MIN_MTU)
1477 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 }
Oussama Ghorbel582442d2013-10-03 14:49:26 +01001479 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1480 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 dev->mtu = new_mtu;
1482 return 0;
1483}
1484
Nicolas Dichtelecf2c062015-04-02 17:07:01 +02001485int ip6_tnl_get_iflink(const struct net_device *dev)
1486{
1487 struct ip6_tnl *t = netdev_priv(dev);
1488
1489 return t->parms.link;
1490}
1491EXPORT_SYMBOL(ip6_tnl_get_iflink);
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001492
1493static const struct net_device_ops ip6_tnl_netdev_ops = {
Steffen Klassert6c6151d2014-11-03 09:19:27 +01001494 .ndo_init = ip6_tnl_dev_init,
Eric Dumazet8560f222010-09-28 03:23:34 +00001495 .ndo_uninit = ip6_tnl_dev_uninit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001496 .ndo_start_xmit = ip6_tnl_xmit,
Eric Dumazet8560f222010-09-28 03:23:34 +00001497 .ndo_do_ioctl = ip6_tnl_ioctl,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001498 .ndo_change_mtu = ip6_tnl_change_mtu,
Eric Dumazet8560f222010-09-28 03:23:34 +00001499 .ndo_get_stats = ip6_get_stats,
Nicolas Dichtelecf2c062015-04-02 17:07:01 +02001500 .ndo_get_iflink = ip6_tnl_get_iflink,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001501};
1502
Eric Dumazet8560f222010-09-28 03:23:34 +00001503
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001505 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 * @dev: virtual device associated with tunnel
1507 *
1508 * Description:
1509 * Initialize function pointers and device parameters
1510 **/
1511
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001512static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513{
Anders Franzen381601e2010-11-24 05:47:18 +00001514 struct ip6_tnl *t;
1515
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001516 dev->netdev_ops = &ip6_tnl_netdev_ops;
Eric Dumazet8560f222010-09-28 03:23:34 +00001517 dev->destructor = ip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518
1519 dev->type = ARPHRD_TUNNEL6;
Ian Morris67ba4152014-08-24 21:53:10 +01001520 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
1521 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001522 t = netdev_priv(dev);
1523 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
Ian Morris67ba4152014-08-24 21:53:10 +01001524 dev->mtu -= 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 dev->flags |= IFF_NOARP;
1526 dev->addr_len = sizeof(struct in6_addr);
Eric Dumazet02875872014-10-05 18:38:35 -07001527 netif_keep_dst(dev);
Nicolas Dichtele8377352013-08-20 12:16:06 +02001528 /* This perm addr will be used as interface identifier by IPv6 */
1529 dev->addr_assign_type = NET_ADDR_RANDOM;
1530 eth_random_addr(dev->perm_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531}
1532
1533
1534/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001535 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 * @dev: virtual device associated with tunnel
1537 **/
1538
Eric Dumazet8560f222010-09-28 03:23:34 +00001539static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001540ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541{
Patrick McHardy2941a482006-01-08 22:05:26 -08001542 struct ip6_tnl *t = netdev_priv(dev);
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001543 int ret;
Eric Dumazet8560f222010-09-28 03:23:34 +00001544
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 t->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001546 t->net = dev_net(dev);
WANG Cong1c213bd2014-02-13 11:46:28 -08001547 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Eric Dumazet8560f222010-09-28 03:23:34 +00001548 if (!dev->tstats)
1549 return -ENOMEM;
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001550
Paolo Abeni607f7252016-02-12 15:43:54 +01001551 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001552 if (ret) {
1553 free_percpu(dev->tstats);
1554 dev->tstats = NULL;
1555 return ret;
1556 }
1557
Eric Dumazet8560f222010-09-28 03:23:34 +00001558 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559}
1560
1561/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001562 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 * @dev: virtual device associated with tunnel
1564 **/
1565
Eric Dumazet8560f222010-09-28 03:23:34 +00001566static int ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567{
Patrick McHardy2941a482006-01-08 22:05:26 -08001568 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001569 int err = ip6_tnl_dev_init_gen(dev);
1570
1571 if (err)
1572 return err;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001573 ip6_tnl_link_config(t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001574 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575}
1576
1577/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001578 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 * @dev: fallback device
1580 *
1581 * Return: 0
1582 **/
1583
Eric Dumazet8560f222010-09-28 03:23:34 +00001584static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585{
Patrick McHardy2941a482006-01-08 22:05:26 -08001586 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001587 struct net *net = dev_net(dev);
1588 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Eric Dumazet8560f222010-09-28 03:23:34 +00001589
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001590 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591 dev_hold(dev);
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001592
Eric Dumazetcf778b02012-01-12 04:41:32 +00001593 rcu_assign_pointer(ip6n->tnls_wc[0], t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001594 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595}
1596
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001597static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1598{
1599 u8 proto;
1600
Susant Sahanic8965932014-05-10 00:11:32 +05301601 if (!data || !data[IFLA_IPTUN_PROTO])
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001602 return 0;
1603
1604 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1605 if (proto != IPPROTO_IPV6 &&
1606 proto != IPPROTO_IPIP &&
1607 proto != 0)
1608 return -EINVAL;
1609
1610 return 0;
1611}
1612
1613static void ip6_tnl_netlink_parms(struct nlattr *data[],
1614 struct __ip6_tnl_parm *parms)
1615{
1616 memset(parms, 0, sizeof(*parms));
1617
1618 if (!data)
1619 return;
1620
1621 if (data[IFLA_IPTUN_LINK])
1622 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1623
1624 if (data[IFLA_IPTUN_LOCAL])
Jiri Benc67b61f62015-03-29 16:59:26 +02001625 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001626
1627 if (data[IFLA_IPTUN_REMOTE])
Jiri Benc67b61f62015-03-29 16:59:26 +02001628 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001629
1630 if (data[IFLA_IPTUN_TTL])
1631 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1632
1633 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1634 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1635
1636 if (data[IFLA_IPTUN_FLOWINFO])
Nicolas Dichtel1ff05fb2012-11-15 04:06:42 +00001637 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001638
1639 if (data[IFLA_IPTUN_FLAGS])
1640 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1641
1642 if (data[IFLA_IPTUN_PROTO])
1643 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1644}
1645
1646static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1647 struct nlattr *tb[], struct nlattr *data[])
1648{
1649 struct net *net = dev_net(dev);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001650 struct ip6_tnl *nt, *t;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001651
1652 nt = netdev_priv(dev);
1653 ip6_tnl_netlink_parms(data, &nt->parms);
1654
Nicolas Dichtel37355562015-03-16 15:56:05 +01001655 t = ip6_tnl_locate(net, &nt->parms, 0);
1656 if (!IS_ERR(t))
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001657 return -EEXIST;
1658
1659 return ip6_tnl_create2(dev);
1660}
1661
1662static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1663 struct nlattr *data[])
1664{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001665 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001666 struct __ip6_tnl_parm p;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001667 struct net *net = t->net;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001668 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1669
1670 if (dev == ip6n->fb_tnl_dev)
1671 return -EINVAL;
1672
1673 ip6_tnl_netlink_parms(data, &p);
1674
1675 t = ip6_tnl_locate(net, &p, 0);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001676 if (!IS_ERR(t)) {
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001677 if (t->dev != dev)
1678 return -EEXIST;
1679 } else
1680 t = netdev_priv(dev);
1681
1682 return ip6_tnl_update(t, &p);
1683}
1684
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001685static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1686{
1687 struct net *net = dev_net(dev);
1688 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1689
1690 if (dev != ip6n->fb_tnl_dev)
1691 unregister_netdevice_queue(dev, head);
1692}
1693
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001694static size_t ip6_tnl_get_size(const struct net_device *dev)
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001695{
1696 return
1697 /* IFLA_IPTUN_LINK */
1698 nla_total_size(4) +
1699 /* IFLA_IPTUN_LOCAL */
1700 nla_total_size(sizeof(struct in6_addr)) +
1701 /* IFLA_IPTUN_REMOTE */
1702 nla_total_size(sizeof(struct in6_addr)) +
1703 /* IFLA_IPTUN_TTL */
1704 nla_total_size(1) +
1705 /* IFLA_IPTUN_ENCAP_LIMIT */
1706 nla_total_size(1) +
1707 /* IFLA_IPTUN_FLOWINFO */
1708 nla_total_size(4) +
1709 /* IFLA_IPTUN_FLAGS */
1710 nla_total_size(4) +
Nicolas Dichtelcfa323b2012-11-14 05:13:58 +00001711 /* IFLA_IPTUN_PROTO */
1712 nla_total_size(1) +
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001713 0;
1714}
1715
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001716static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001717{
1718 struct ip6_tnl *tunnel = netdev_priv(dev);
1719 struct __ip6_tnl_parm *parm = &tunnel->parms;
1720
1721 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
Jiri Benc930345e2015-03-29 16:59:25 +02001722 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
1723 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001724 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1725 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1726 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
Nicolas Dichtelcfa323b2012-11-14 05:13:58 +00001727 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1728 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001729 goto nla_put_failure;
1730 return 0;
1731
1732nla_put_failure:
1733 return -EMSGSIZE;
1734}
1735
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01001736struct net *ip6_tnl_get_link_net(const struct net_device *dev)
1737{
1738 struct ip6_tnl *tunnel = netdev_priv(dev);
1739
1740 return tunnel->net;
1741}
1742EXPORT_SYMBOL(ip6_tnl_get_link_net);
1743
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001744static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1745 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1746 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1747 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1748 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1749 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1750 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1751 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1752 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1753};
1754
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001755static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1756 .kind = "ip6tnl",
1757 .maxtype = IFLA_IPTUN_MAX,
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001758 .policy = ip6_tnl_policy,
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001759 .priv_size = sizeof(struct ip6_tnl),
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001760 .setup = ip6_tnl_dev_setup,
1761 .validate = ip6_tnl_validate,
1762 .newlink = ip6_tnl_newlink,
1763 .changelink = ip6_tnl_changelink,
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001764 .dellink = ip6_tnl_dellink,
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001765 .get_size = ip6_tnl_get_size,
1766 .fill_info = ip6_tnl_fill_info,
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01001767 .get_link_net = ip6_tnl_get_link_net,
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001768};
1769
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001770static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001771 .handler = ip4ip6_rcv,
1772 .err_handler = ip4ip6_err,
1773 .priority = 1,
1774};
1775
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001776static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
Patrick McHardy03037702005-07-19 14:03:34 -07001777 .handler = ip6ip6_rcv,
1778 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08001779 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780};
1781
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001782static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001783{
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001784 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001785 struct net_device *dev, *aux;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001786 int h;
1787 struct ip6_tnl *t;
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001788 LIST_HEAD(list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001789
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001790 for_each_netdev_safe(net, dev, aux)
1791 if (dev->rtnl_link_ops == &ip6_link_ops)
1792 unregister_netdevice_queue(dev, &list);
1793
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001794 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet94767632010-09-15 20:25:34 +00001795 t = rtnl_dereference(ip6n->tnls_r_l[h]);
Ian Morris53b24b82015-03-29 14:00:05 +01001796 while (t) {
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001797 /* If dev is in the same netns, it has already
1798 * been added to the list by the previous loop.
1799 */
1800 if (!net_eq(dev_net(t->dev), net))
1801 unregister_netdevice_queue(t->dev, &list);
Eric Dumazet94767632010-09-15 20:25:34 +00001802 t = rtnl_dereference(t->next);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001803 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001804 }
1805
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001806 unregister_netdevice_many(&list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001807}
1808
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001809static int __net_init ip6_tnl_init_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001810{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001811 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Josh Boyer731abb92011-11-10 15:10:23 +00001812 struct ip6_tnl *t = NULL;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001813 int err;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001814
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001815 ip6n->tnls[0] = ip6n->tnls_wc;
1816 ip6n->tnls[1] = ip6n->tnls_r_l;
1817
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001818 err = -ENOMEM;
1819 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
Tom Gundersenc835a672014-07-14 16:37:24 +02001820 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001821
1822 if (!ip6n->fb_tnl_dev)
1823 goto err_alloc_dev;
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001824 dev_net_set(ip6n->fb_tnl_dev, net);
Nicolas Dichtelbb814092013-10-01 18:05:00 +02001825 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001826 /* FB netdevice is special: we have one, and only one per netns.
1827 * Allowing to move it to another netns is clearly unsafe.
1828 */
1829 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001830
Eric Dumazet8560f222010-09-28 03:23:34 +00001831 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1832 if (err < 0)
1833 goto err_register;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001834
1835 err = register_netdev(ip6n->fb_tnl_dev);
1836 if (err < 0)
1837 goto err_register;
Josh Boyer731abb92011-11-10 15:10:23 +00001838
1839 t = netdev_priv(ip6n->fb_tnl_dev);
1840
1841 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001842 return 0;
1843
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001844err_register:
Eric Dumazet8560f222010-09-28 03:23:34 +00001845 ip6_dev_free(ip6n->fb_tnl_dev);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001846err_alloc_dev:
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001847 return err;
1848}
1849
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001850static void __net_exit ip6_tnl_exit_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001851{
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001852 rtnl_lock();
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001853 ip6_tnl_destroy_tunnels(net);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001854 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001855}
1856
1857static struct pernet_operations ip6_tnl_net_ops = {
1858 .init = ip6_tnl_init_net,
1859 .exit = ip6_tnl_exit_net,
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001860 .id = &ip6_tnl_net_id,
1861 .size = sizeof(struct ip6_tnl_net),
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001862};
1863
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864/**
1865 * ip6_tunnel_init - register protocol and reserve needed resources
1866 *
1867 * Return: 0 on success
1868 **/
1869
1870static int __init ip6_tunnel_init(void)
1871{
1872 int err;
1873
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001874 err = register_pernet_device(&ip6_tnl_net_ops);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001875 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001876 goto out_pernet;
1877
1878 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1879 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00001880 pr_err("%s: can't register ip4ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001881 goto out_ip4ip6;
1882 }
1883
1884 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1885 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00001886 pr_err("%s: can't register ip6ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001887 goto out_ip6ip6;
1888 }
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001889 err = rtnl_link_register(&ip6_link_ops);
1890 if (err < 0)
1891 goto rtnl_link_failed;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001892
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 return 0;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001894
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001895rtnl_link_failed:
1896 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001897out_ip6ip6:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001898 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001899out_ip4ip6:
1900 unregister_pernet_device(&ip6_tnl_net_ops);
1901out_pernet:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 return err;
1903}
1904
1905/**
1906 * ip6_tunnel_cleanup - free resources and unregister protocol
1907 **/
1908
1909static void __exit ip6_tunnel_cleanup(void)
1910{
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001911 rtnl_link_unregister(&ip6_link_ops);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001912 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Joe Perchesf3213832012-05-15 14:11:53 +00001913 pr_info("%s: can't deregister ip4ip6\n", __func__);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001914
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001915 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Joe Perchesf3213832012-05-15 14:11:53 +00001916 pr_info("%s: can't deregister ip6ip6\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001918 unregister_pernet_device(&ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919}
1920
1921module_init(ip6_tunnel_init);
1922module_exit(ip6_tunnel_cleanup);