blob: 7b0481e3738f20b672cac77a88617adbe8ecfbbf [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
Tom Herbert0d3c7032016-04-29 17:12:15 -0700241 gro_cells_destroy(&t->gro_cells);
Paolo Abeni607f7252016-02-12 15:43:54 +0100242 dst_cache_destroy(&t->dst_cache);
Eric Dumazet8560f222010-09-28 03:23:34 +0000243 free_percpu(dev->tstats);
244 free_netdev(dev);
245}
246
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000247static int ip6_tnl_create2(struct net_device *dev)
248{
249 struct ip6_tnl *t = netdev_priv(dev);
250 struct net *net = dev_net(dev);
251 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
252 int err;
253
254 t = netdev_priv(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000255
Thadeu Lima de Souza Cascardob6ee3762016-04-01 17:17:50 -0300256 dev->rtnl_link_ops = &ip6_link_ops;
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000257 err = register_netdevice(dev);
258 if (err < 0)
259 goto out;
260
261 strcpy(t->parms.name, dev->name);
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000262
263 dev_hold(dev);
264 ip6_tnl_link(ip6n, t);
265 return 0;
266
267out:
268 return err;
269}
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000272 * ip6_tnl_create - create a new tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 * @p: tunnel parameters
274 * @pt: pointer to new tunnel
275 *
276 * Description:
277 * Create tunnel matching given parameters.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900278 *
279 * Return:
Nicolas Dichtel37355562015-03-16 15:56:05 +0100280 * created tunnel or error pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 **/
282
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000283static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
285 struct net_device *dev;
286 struct ip6_tnl *t;
287 char name[IFNAMSIZ];
Nicolas Dichtel37355562015-03-16 15:56:05 +0100288 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800290 if (p->name[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 strlcpy(name, p->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800292 else
293 sprintf(name, "ip6tnl%%d");
294
Tom Gundersenc835a672014-07-14 16:37:24 +0200295 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
296 ip6_tnl_dev_setup);
Ian Morris63159f22015-03-29 14:00:04 +0100297 if (!dev)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800298 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Pavel Emelyanov554eb272008-04-16 01:24:13 -0700300 dev_net_set(dev, net);
301
Patrick McHardy2941a482006-01-08 22:05:26 -0800302 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 t->parms = *p;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200304 t->net = dev_net(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +0000305 err = ip6_tnl_create2(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +0000306 if (err < 0)
307 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Ville Nuorvala567131a2006-11-24 17:05:41 -0800309 return t;
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800310
311failed_free:
Eric Dumazet8560f222010-09-28 03:23:34 +0000312 ip6_dev_free(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800313failed:
Nicolas Dichtel37355562015-03-16 15:56:05 +0100314 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315}
316
317/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900318 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900319 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 * @create: != 0 if allowed to create new tunnel if no match found
321 *
322 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900323 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 * based on @parms. If this is unsuccessful, but @create is set a new
325 * tunnel device is created and registered for use.
326 *
327 * Return:
Nicolas Dichtel37355562015-03-16 15:56:05 +0100328 * matching tunnel or error pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 **/
330
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700331static struct ip6_tnl *ip6_tnl_locate(struct net *net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000332 struct __ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000334 const struct in6_addr *remote = &p->raddr;
335 const struct in6_addr *local = &p->laddr;
Eric Dumazet94767632010-09-15 20:25:34 +0000336 struct ip6_tnl __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700338 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Eric Dumazet94767632010-09-15 20:25:34 +0000340 for (tp = ip6_tnl_bucket(ip6n, p);
341 (t = rtnl_dereference(*tp)) != NULL;
342 tp = &t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Steffen Klassert2b0bb012014-09-22 10:07:24 +0200344 ipv6_addr_equal(remote, &t->parms.raddr)) {
345 if (create)
Nicolas Dichtel37355562015-03-16 15:56:05 +0100346 return ERR_PTR(-EEXIST);
Steffen Klassert2b0bb012014-09-22 10:07:24 +0200347
Ville Nuorvala567131a2006-11-24 17:05:41 -0800348 return t;
Steffen Klassert2b0bb012014-09-22 10:07:24 +0200349 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 }
351 if (!create)
Nicolas Dichtel37355562015-03-16 15:56:05 +0100352 return ERR_PTR(-ENODEV);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700353 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354}
355
356/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900357 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900359 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900361 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 **/
363
364static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900365ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
Patrick McHardy2941a482006-01-08 22:05:26 -0800367 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200368 struct net *net = t->net;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700369 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Eric Dumazet94767632010-09-15 20:25:34 +0000371 if (dev == ip6n->fb_tnl_dev)
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000372 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
Eric Dumazet94767632010-09-15 20:25:34 +0000373 else
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700374 ip6_tnl_unlink(ip6n, t);
Paolo Abeni607f7252016-02-12 15:43:54 +0100375 dst_cache_reset(&t->dst_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 dev_put(dev);
377}
378
379/**
380 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
381 * @skb: received socket buffer
382 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900383 * Return:
384 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 * else index to encapsulation limit
386 **/
387
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000388__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000390 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 __u8 nexthdr = ipv6h->nexthdr;
Ian Morris67ba4152014-08-24 21:53:10 +0100392 __u16 off = sizeof(*ipv6h);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
395 __u16 optlen = 0;
396 struct ipv6_opt_hdr *hdr;
Ian Morris67ba4152014-08-24 21:53:10 +0100397 if (raw + off + sizeof(*hdr) > skb->data &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
399 break;
400
401 hdr = (struct ipv6_opt_hdr *) (raw + off);
402 if (nexthdr == NEXTHDR_FRAGMENT) {
403 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
404 if (frag_hdr->frag_off)
405 break;
406 optlen = 8;
407 } else if (nexthdr == NEXTHDR_AUTH) {
408 optlen = (hdr->hdrlen + 2) << 2;
409 } else {
410 optlen = ipv6_optlen(hdr);
411 }
412 if (nexthdr == NEXTHDR_DEST) {
413 __u16 i = off + 2;
414 while (1) {
415 struct ipv6_tlv_tnl_enc_lim *tel;
416
417 /* No more room for encapsulation limit */
418 if (i + sizeof (*tel) > off + optlen)
419 break;
420
421 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
422 /* return index of option if found and valid */
423 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
424 tel->length == 1)
425 return i;
426 /* else jump to next option */
427 if (tel->type)
428 i += tel->length + 2;
429 else
430 i++;
431 }
432 }
433 nexthdr = hdr->nexthdr;
434 off += optlen;
435 }
436 return 0;
437}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000438EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900441 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 *
443 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900444 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 * to the specifications in RFC 2473.
446 **/
447
Herbert Xud2acc342006-03-28 01:12:13 -0800448static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900449ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700450 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000452 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 struct ip6_tnl *t;
454 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700455 u8 rel_type = ICMPV6_DEST_UNREACH;
456 u8 rel_code = ICMPV6_ADDR_UNREACH;
Alexey Andriyanovacf722f2014-10-29 10:54:52 +0300457 u8 tproto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 __u32 rel_info = 0;
459 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800460 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900462 /* If the packet doesn't contain the original IPv6 header we are
463 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 processing of the error. */
465
Eric Dumazet2922bc82009-10-23 06:34:34 +0000466 rcu_read_lock();
Ian Morrise5d08d72014-11-23 21:28:43 +0000467 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
Ian Morris63159f22015-03-29 14:00:04 +0100468 if (!t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 goto out;
470
Alexey Andriyanovacf722f2014-10-29 10:54:52 +0300471 tproto = ACCESS_ONCE(t->parms.proto);
472 if (tproto != ipproto && tproto != 0)
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900473 goto out;
474
Herbert Xud2acc342006-03-28 01:12:13 -0800475 err = 0;
476
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900477 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 __u32 teli;
479 struct ipv6_tlv_tnl_enc_lim *tel;
480 __u32 mtu;
481 case ICMPV6_DEST_UNREACH:
Matt Bennett17a10c92015-09-25 11:01:47 +1200482 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
483 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 rel_msg = 1;
485 break;
486 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900487 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Matt Bennett17a10c92015-09-25 11:01:47 +1200488 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
489 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 rel_msg = 1;
491 }
492 break;
493 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800494 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900495 if ((*code) == ICMPV6_HDR_FIELD)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000496 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Al Viro704eae12007-07-26 17:33:29 +0100498 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
500 if (tel->encap_limit == 0) {
Matt Bennett17a10c92015-09-25 11:01:47 +1200501 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
502 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 rel_msg = 1;
504 }
Joe Perchese87cc472012-05-13 21:56:26 +0000505 } else {
Matt Bennett17a10c92015-09-25 11:01:47 +1200506 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
507 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 }
509 break;
510 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100511 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 if (mtu < IPV6_MIN_MTU)
513 mtu = IPV6_MIN_MTU;
514 t->dev->mtu = mtu;
515
Ian Morrise5d08d72014-11-23 21:28:43 +0000516 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
517 if (len > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 rel_type = ICMPV6_PKT_TOOBIG;
519 rel_code = 0;
520 rel_info = mtu;
521 rel_msg = 1;
522 }
523 break;
524 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900525
526 *type = rel_type;
527 *code = rel_code;
528 *info = rel_info;
529 *msg = rel_msg;
530
531out:
Eric Dumazet2922bc82009-10-23 06:34:34 +0000532 rcu_read_unlock();
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900533 return err;
534}
535
536static int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900537ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700538 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900539{
540 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700541 u8 rel_type = type;
542 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100543 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900544 int err;
545 struct sk_buff *skb2;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000546 const struct iphdr *eiph;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900547 struct rtable *rt;
David S. Miller31e45432011-05-03 20:25:42 -0700548 struct flowi4 fl4;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900549
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900550 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
551 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900552 if (err < 0)
553 return err;
554
555 if (rel_msg == 0)
556 return 0;
557
558 switch (rel_type) {
559 case ICMPV6_DEST_UNREACH:
560 if (rel_code != ICMPV6_ADDR_UNREACH)
561 return 0;
562 rel_type = ICMP_DEST_UNREACH;
563 rel_code = ICMP_HOST_UNREACH;
564 break;
565 case ICMPV6_PKT_TOOBIG:
566 if (rel_code != 0)
567 return 0;
568 rel_type = ICMP_DEST_UNREACH;
569 rel_code = ICMP_FRAG_NEEDED;
570 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700571 case NDISC_REDIRECT:
572 rel_type = ICMP_REDIRECT;
573 rel_code = ICMP_REDIR_HOST;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900574 default:
575 return 0;
576 }
577
578 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
579 return 0;
580
581 skb2 = skb_clone(skb, GFP_ATOMIC);
582 if (!skb2)
583 return 0;
584
Eric Dumazetadf30902009-06-02 05:19:30 +0000585 skb_dst_drop(skb2);
586
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900587 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700588 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700589 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900590
591 /* Try to guess incoming interface */
David S. Miller31e45432011-05-03 20:25:42 -0700592 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500593 eiph->saddr, 0,
594 0, 0,
595 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800596 if (IS_ERR(rt))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900597 goto out;
598
Changli Gaod8d1f302010-06-10 23:31:35 -0700599 skb2->dev = rt->dst.dev;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900600
601 /* route "incoming" packet */
602 if (rt->rt_flags & RTCF_LOCAL) {
603 ip_rt_put(rt);
604 rt = NULL;
David S. Miller31e45432011-05-03 20:25:42 -0700605 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500606 eiph->daddr, eiph->saddr,
607 0, 0,
608 IPPROTO_IPIP,
609 RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800610 if (IS_ERR(rt) ||
Changli Gaod8d1f302010-06-10 23:31:35 -0700611 rt->dst.dev->type != ARPHRD_TUNNEL) {
David S. Millerb23dd4f2011-03-02 14:31:35 -0800612 if (!IS_ERR(rt))
613 ip_rt_put(rt);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900614 goto out;
615 }
David S. Millerb23dd4f2011-03-02 14:31:35 -0800616 skb_dst_set(skb2, &rt->dst);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900617 } else {
618 ip_rt_put(rt);
619 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
620 skb2->dev) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000621 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900622 goto out;
623 }
624
625 /* change mtu on this route */
626 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000627 if (rel_info > dst_mtu(skb_dst(skb2)))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900628 goto out;
629
David S. Miller6700c272012-07-17 03:29:28 -0700630 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900631 }
David S. Miller1ed5c482012-07-12 00:41:25 -0700632 if (rel_type == ICMP_REDIRECT)
David S. Miller6700c272012-07-17 03:29:28 -0700633 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900634
Al Viro704eae12007-07-26 17:33:29 +0100635 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900636
637out:
638 kfree_skb(skb2);
639 return 0;
640}
641
642static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900643ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700644 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900645{
646 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700647 u8 rel_type = type;
648 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100649 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900650 int err;
651
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900652 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
653 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900654 if (err < 0)
655 return err;
656
657 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 struct rt6_info *rt;
659 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800660
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900662 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
Eric Dumazetadf30902009-06-02 05:19:30 +0000664 skb_dst_drop(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700666 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700669 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
670 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
David S. Millerd1918542011-12-28 20:19:20 -0500672 if (rt && rt->dst.dev)
673 skb2->dev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000675 icmpv6_send(skb2, rel_type, rel_code, rel_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Amerigo Wang94e187c2012-10-29 00:13:19 +0000677 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
679 kfree_skb(skb2);
680 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900681
682 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683}
684
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000685static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
686 const struct ipv6hdr *ipv6h,
687 struct sk_buff *skb)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900688{
689 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
690
691 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700692 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900693
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000694 return IP6_ECN_decapsulate(ipv6h, skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900695}
696
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000697static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
698 const struct ipv6hdr *ipv6h,
699 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900701 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b42007-11-13 21:40:13 -0800702 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000704 return IP6_ECN_decapsulate(ipv6h, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900706
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000707__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000708 const struct in6_addr *laddr,
709 const struct in6_addr *raddr)
710{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000711 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000712 int ltype = ipv6_addr_type(laddr);
713 int rtype = ipv6_addr_type(raddr);
714 __u32 flags = 0;
715
716 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
717 flags = IP6_TNL_F_CAP_PER_PACKET;
718 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
719 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
720 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
721 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
722 if (ltype&IPV6_ADDR_UNICAST)
723 flags |= IP6_TNL_F_CAP_XMIT;
724 if (rtype&IPV6_ADDR_UNICAST)
725 flags |= IP6_TNL_F_CAP_RCV;
726 }
727 return flags;
728}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000729EXPORT_SYMBOL(ip6_tnl_get_cap);
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000730
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100731/* called with rcu_read_lock() */
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000732int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000733 const struct in6_addr *laddr,
734 const struct in6_addr *raddr)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800735{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000736 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800737 int ret = 0;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200738 struct net *net = t->net;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800739
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000740 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
741 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
742 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900743 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800744
745 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100746 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800747
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000748 if ((ipv6_addr_is_multicast(laddr) ||
749 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
750 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800751 ret = 1;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800752 }
753 return ret;
754}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000755EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
Tom Herbert0d3c7032016-04-29 17:12:15 -0700757static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
758 const struct tnl_ptk_info *tpi,
759 struct metadata_dst *tun_dst,
760 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
761 const struct ipv6hdr *ipv6h,
762 struct sk_buff *skb),
763 bool log_ecn_err)
764{
765 struct pcpu_sw_netstats *tstats;
766 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
767 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Tom Herbert0d3c7032016-04-29 17:12:15 -0700769 if ((!(tpi->flags & TUNNEL_CSUM) &&
770 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
771 ((tpi->flags & TUNNEL_CSUM) &&
772 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
773 tunnel->dev->stats.rx_crc_errors++;
774 tunnel->dev->stats.rx_errors++;
775 goto drop;
776 }
777
778 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
779 if (!(tpi->flags & TUNNEL_SEQ) ||
780 (tunnel->i_seqno &&
781 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
782 tunnel->dev->stats.rx_fifo_errors++;
783 tunnel->dev->stats.rx_errors++;
784 goto drop;
785 }
786 tunnel->i_seqno = ntohl(tpi->seq) + 1;
787 }
788
789 skb->protocol = tpi->proto;
790
791 /* Warning: All skb pointers will be invalidated! */
792 if (tunnel->dev->type == ARPHRD_ETHER) {
793 if (!pskb_may_pull(skb, ETH_HLEN)) {
794 tunnel->dev->stats.rx_length_errors++;
795 tunnel->dev->stats.rx_errors++;
796 goto drop;
797 }
798
799 ipv6h = ipv6_hdr(skb);
800 skb->protocol = eth_type_trans(skb, tunnel->dev);
801 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
802 } else {
803 skb->dev = tunnel->dev;
804 }
805
806 skb_reset_network_header(skb);
807 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
808
809 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
810
811 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
812 if (unlikely(err)) {
813 if (log_ecn_err)
814 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
815 &ipv6h->saddr,
816 ipv6_get_dsfield(ipv6h));
817 if (err > 1) {
818 ++tunnel->dev->stats.rx_frame_errors;
819 ++tunnel->dev->stats.rx_errors;
820 goto drop;
821 }
822 }
823
824 tstats = this_cpu_ptr(tunnel->dev->tstats);
825 u64_stats_update_begin(&tstats->syncp);
826 tstats->rx_packets++;
827 tstats->rx_bytes += skb->len;
828 u64_stats_update_end(&tstats->syncp);
829
830 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
831
832 gro_cells_receive(&tunnel->gro_cells, skb);
833 return 0;
834
835drop:
836 kfree_skb(skb);
837 return 0;
838}
839
840int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
841 const struct tnl_ptk_info *tpi,
842 struct metadata_dst *tun_dst,
843 bool log_ecn_err)
844{
845 return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate,
846 log_ecn_err);
847}
848EXPORT_SYMBOL(ip6_tnl_rcv);
849
850static const struct tnl_ptk_info tpi_v6 = {
851 /* no tunnel info required for ipxip6. */
852 .proto = htons(ETH_P_IPV6),
853};
854
855static const struct tnl_ptk_info tpi_v4 = {
856 /* no tunnel info required for ipxip6. */
857 .proto = htons(ETH_P_IP),
858};
859
860static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
861 const struct tnl_ptk_info *tpi,
862 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
863 const struct ipv6hdr *ipv6h,
864 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 struct ip6_tnl *t;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000867 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Tom Herbert0d3c7032016-04-29 17:12:15 -0700868 int ret = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Eric Dumazet2922bc82009-10-23 06:34:34 +0000870 rcu_read_lock();
Ian Morrise5d08d72014-11-23 21:28:43 +0000871 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
Tom Herbert0d3c7032016-04-29 17:12:15 -0700872
Ian Morris53b24b82015-03-29 14:00:05 +0100873 if (t) {
Tom Herbert0d3c7032016-04-29 17:12:15 -0700874 u8 tproto = ACCESS_ONCE(t->parms.proto);
Eric Dumazet8560f222010-09-28 03:23:34 +0000875
Tom Herbert0d3c7032016-04-29 17:12:15 -0700876 if (tproto != ipproto && tproto != 0)
877 goto drop;
878 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
879 goto drop;
880 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
881 goto drop;
882 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
883 goto drop;
884 ret = __ip6_tnl_rcv(t, skb, tpi, NULL, dscp_ecn_decapsulate,
885 log_ecn_error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 }
Herbert Xu50fba2a2006-04-04 13:50:45 -0700887
Tom Herbert0d3c7032016-04-29 17:12:15 -0700888 rcu_read_unlock();
889
890 return ret;
891
892drop:
893 rcu_read_unlock();
Herbert Xu50fba2a2006-04-04 13:50:45 -0700894 kfree_skb(skb);
895 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896}
897
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900898static int ip4ip6_rcv(struct sk_buff *skb)
899{
Nicolas Dichtelca4aa972016-05-10 16:08:17 +0200900 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
Tom Herbert0d3c7032016-04-29 17:12:15 -0700901 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900902}
903
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900904static int ip6ip6_rcv(struct sk_buff *skb)
905{
Tom Herbert0d3c7032016-04-29 17:12:15 -0700906 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
907 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900908}
909
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800910struct ipv6_tel_txoption {
911 struct ipv6_txoptions ops;
912 __u8 dst_opt[8];
913};
914
915static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800917 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800919 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
920 opt->dst_opt[3] = 1;
921 opt->dst_opt[4] = encap_limit;
922 opt->dst_opt[5] = IPV6_TLV_PADN;
923 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800925 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
926 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927}
928
929/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900930 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900932 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 *
934 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900935 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 * doesn't match source of incoming packet.
937 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900938 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 * 1 if conflict,
940 * 0 else
941 **/
942
Eric Dumazet92113bf2012-05-18 08:14:11 +0200943static inline bool
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000944ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945{
946 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
947}
948
Steffen Klassertd5005142014-11-05 08:02:48 +0100949int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
950 const struct in6_addr *laddr,
951 const struct in6_addr *raddr)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800952{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000953 struct __ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800954 int ret = 0;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200955 struct net *net = t->net;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800956
Steffen Klassertd5005142014-11-05 08:02:48 +0100957 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
958 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
959 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800960 struct net_device *ldev = NULL;
961
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100962 rcu_read_lock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800963 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100964 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800965
Steffen Klassertd5005142014-11-05 08:02:48 +0100966 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000967 pr_warn("%s xmit: Local address not yet configured!\n",
968 p->name);
Steffen Klassertd5005142014-11-05 08:02:48 +0100969 else if (!ipv6_addr_is_multicast(raddr) &&
970 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000971 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
972 p->name);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800973 else
974 ret = 1;
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100975 rcu_read_unlock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800976 }
977 return ret;
978}
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000979EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
980
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981/**
Tom Herbert8eb30be2016-04-29 17:12:18 -0700982 * ip6_tnl_xmit - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900984 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900985 * @dsfield: dscp code for outer header
Tom Herbert8eb30be2016-04-29 17:12:18 -0700986 * @fl6: flow of tunneled packet
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900987 * @encap_limit: encapsulation limit
988 * @pmtu: Path MTU is stored if packet is too big
Tom Herbert8eb30be2016-04-29 17:12:18 -0700989 * @proto: next header value
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 *
991 * Description:
992 * Build new header and do some sanity checks on the packet before sending
993 * it.
994 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900995 * Return:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900996 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900997 * -1 fail
998 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 **/
1000
Tom Herbert8eb30be2016-04-29 17:12:18 -07001001int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1002 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1003 __u8 proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004{
Patrick McHardy2941a482006-01-08 22:05:26 -08001005 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001006 struct net *net = t->net;
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001007 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001008 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -08001009 struct ipv6_tel_txoption opt;
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001010 struct dst_entry *dst = NULL, *ndst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 struct net_device *tdev;
1012 int mtu;
Tom Herbert058214a2016-05-18 09:06:17 -07001013 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1014 unsigned int max_headroom = psh_hlen;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001015 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
Steffen Klassertea3dc962014-11-05 08:03:50 +01001017 /* NBMA tunnel */
1018 if (ipv6_addr_any(&t->parms.raddr)) {
1019 struct in6_addr *addr6;
1020 struct neighbour *neigh;
1021 int addr_type;
1022
1023 if (!skb_dst(skb))
1024 goto tx_err_link_failure;
1025
1026 neigh = dst_neigh_lookup(skb_dst(skb),
1027 &ipv6_hdr(skb)->daddr);
1028 if (!neigh)
1029 goto tx_err_link_failure;
1030
1031 addr6 = (struct in6_addr *)&neigh->primary_key;
1032 addr_type = ipv6_addr_type(addr6);
1033
1034 if (addr_type == IPV6_ADDR_ANY)
1035 addr6 = &ipv6_hdr(skb)->daddr;
1036
1037 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1038 neigh_release(neigh);
1039 } else if (!fl6->flowi6_mark)
Paolo Abeni607f7252016-02-12 15:43:54 +01001040 dst = dst_cache_get(&t->dst_cache);
Steffen Klassertd5005142014-11-05 08:02:48 +01001041
1042 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1043 goto tx_err_link_failure;
1044
Eric Dumazet89b02122011-07-28 04:32:25 +00001045 if (!dst) {
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001046 dst = ip6_route_output(net, NULL, fl6);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001048 if (dst->error)
Patrick McHardya57ebc92005-09-08 14:27:47 -07001049 goto tx_err_link_failure;
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001050 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1051 if (IS_ERR(dst)) {
1052 err = PTR_ERR(dst);
1053 dst = NULL;
David S. Miller452edd52011-03-02 13:27:41 -08001054 goto tx_err_link_failure;
1055 }
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001056 ndst = dst;
Patrick McHardya57ebc92005-09-08 14:27:47 -07001057 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058
1059 tdev = dst->dev;
1060
1061 if (tdev == dev) {
1062 stats->collisions++;
Joe Perchese87cc472012-05-13 21:56:26 +00001063 net_warn_ratelimited("%s: Local routing loop detected!\n",
1064 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 goto tx_err_dst_release;
1066 }
Tom Herbert058214a2016-05-18 09:06:17 -07001067 mtu = dst_mtu(dst) - psh_hlen;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -08001068 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 max_headroom += 8;
1070 mtu -= 8;
1071 }
1072 if (mtu < IPV6_MIN_MTU)
1073 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +00001074 if (skb_dst(skb))
David S. Miller6700c272012-07-17 03:29:28 -07001075 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
Tom Herbert8eb30be2016-04-29 17:12:18 -07001076 if (skb->len > mtu && !skb_is_gso(skb)) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001077 *pmtu = mtu;
1078 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 goto tx_err_dst_release;
1080 }
1081
Tom Herbert8eb30be2016-04-29 17:12:18 -07001082 if (t->err_count > 0) {
1083 if (time_before(jiffies,
1084 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1085 t->err_count--;
1086
1087 dst_link_failure(skb);
1088 } else {
1089 t->err_count = 0;
1090 }
1091 }
1092
Nicolas Dichtel963a88b2013-09-02 15:34:57 +02001093 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001094
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 /*
1096 * Okay, now see if we can stuff it in the buffer as-is.
1097 */
1098 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001099
Patrick McHardycfbba492007-07-09 15:33:40 -07001100 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1101 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001103
Ian Morrise5d08d72014-11-23 21:28:43 +00001104 new_skb = skb_realloc_headroom(skb, max_headroom);
1105 if (!new_skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 goto tx_err_dst_release;
1107
1108 if (skb->sk)
1109 skb_set_owner_w(new_skb, skb->sk);
Eric Dumazet9ff26442012-04-19 02:24:17 +00001110 consume_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 skb = new_skb;
1112 }
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001113
1114 if (!fl6->flowi6_mark && ndst)
Paolo Abeni607f7252016-02-12 15:43:54 +01001115 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001116 skb_dst_set(skb, dst);
1117
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -08001118 if (encap_limit >= 0) {
1119 init_tel_txopt(&opt, encap_limit);
1120 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1121 }
Hannes Frederic Sowa3d483052013-08-18 13:46:52 +02001122
Tom Herbert058214a2016-05-18 09:06:17 -07001123 /* Calculate max headroom for all the headers and adjust
1124 * needed_headroom if necessary.
1125 */
Tom Herbert8eb30be2016-04-29 17:12:18 -07001126 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
Tom Herbert058214a2016-05-18 09:06:17 -07001127 + dst->header_len + t->hlen;
Tom Herbert8eb30be2016-04-29 17:12:18 -07001128 if (max_headroom > dev->needed_headroom)
1129 dev->needed_headroom = max_headroom;
1130
Tom Herbert058214a2016-05-18 09:06:17 -07001131 err = ip6_tnl_encap(skb, t, &proto, fl6);
1132 if (err)
1133 return err;
1134
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -07001135 skb_push(skb, sizeof(struct ipv6hdr));
1136 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001137 ipv6h = ipv6_hdr(skb);
Tom Herbertcb1ce2e2014-07-01 21:33:10 -07001138 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
Tom Herbert42240902015-07-31 16:52:12 -07001139 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 ipv6h->hop_limit = t->parms.hop_limit;
1141 ipv6h->nexthdr = proto;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001142 ipv6h->saddr = fl6->saddr;
1143 ipv6h->daddr = fl6->daddr;
David Miller79b16aa2015-04-05 22:19:09 -04001144 ip6tunnel_xmit(NULL, skb, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 return 0;
1146tx_err_link_failure:
1147 stats->tx_carrier_errors++;
1148 dst_link_failure(skb);
1149tx_err_dst_release:
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001150 dst_release(dst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001151 return err;
1152}
Tom Herbert8eb30be2016-04-29 17:12:18 -07001153EXPORT_SYMBOL(ip6_tnl_xmit);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001154
1155static inline int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001156ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1157{
1158 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001159 const struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001160 int encap_limit = -1;
David S. Miller4c9483b2011-03-12 16:22:43 -05001161 struct flowi6 fl6;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001162 __u8 dsfield;
1163 __u32 mtu;
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001164 u8 tproto;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001165 int err;
1166
Bernie Harris5146d1f2016-02-22 12:58:05 +13001167 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1168
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001169 tproto = ACCESS_ONCE(t->parms.proto);
Steffen Klassertd5005142014-11-05 08:02:48 +01001170 if (tproto != IPPROTO_IPIP && tproto != 0)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001171 return -1;
1172
1173 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1174 encap_limit = t->parms.encap_limit;
1175
Ian Morris67ba4152014-08-24 21:53:10 +01001176 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001177
1178 dsfield = ipv4_get_dsfield(iph);
1179
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001180 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001181 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
Al Virob77f2fa2007-07-21 19:09:41 -07001182 & IPV6_TCLASS_MASK;
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001183 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1184 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001185
Tom Herbertb8921ca2016-05-18 09:06:23 -07001186 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1187 return -1;
1188
1189 skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1190
Tom Herbert8eb30be2016-04-29 17:12:18 -07001191 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1192 IPPROTO_IPIP);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001193 if (err != 0) {
1194 /* XXX: send ICMP error even if DF is not set. */
1195 if (err == -EMSGSIZE)
1196 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1197 htonl(mtu));
1198 return -1;
1199 }
1200
1201 return 0;
1202}
1203
1204static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001205ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1206{
1207 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001208 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001209 int encap_limit = -1;
1210 __u16 offset;
David S. Miller4c9483b2011-03-12 16:22:43 -05001211 struct flowi6 fl6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001212 __u8 dsfield;
1213 __u32 mtu;
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001214 u8 tproto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001215 int err;
1216
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001217 tproto = ACCESS_ONCE(t->parms.proto);
1218 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
Steffen Klassertd5005142014-11-05 08:02:48 +01001219 ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001220 return -1;
1221
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001222 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001223 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001224 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001225 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001226 if (tel->encap_limit == 0) {
1227 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001228 ICMPV6_HDR_FIELD, offset + 2);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001229 return -1;
1230 }
1231 encap_limit = tel->encap_limit - 1;
1232 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1233 encap_limit = t->parms.encap_limit;
1234
Ian Morris67ba4152014-08-24 21:53:10 +01001235 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001236
1237 dsfield = ipv6_get_dsfield(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001238 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001239 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001240 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
Florent Fourcot3308de22013-12-08 15:47:00 +01001241 fl6.flowlabel |= ip6_flowlabel(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001242 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1243 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001244
Tom Herbert815d22e2016-05-18 09:06:22 -07001245 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1246 return -1;
1247
1248 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1249
Tom Herbert8eb30be2016-04-29 17:12:18 -07001250 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1251 IPPROTO_IPV6);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001252 if (err != 0) {
1253 if (err == -EMSGSIZE)
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001254 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001255 return -1;
1256 }
1257
1258 return 0;
1259}
1260
Stephen Hemminger6fef4c02009-08-31 19:50:41 +00001261static netdev_tx_t
Tom Herbert8eb30be2016-04-29 17:12:18 -07001262ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001263{
1264 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001265 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001266 int ret;
1267
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001268 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001269 case htons(ETH_P_IP):
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001270 ret = ip4ip6_tnl_xmit(skb, dev);
1271 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001272 case htons(ETH_P_IPV6):
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001273 ret = ip6ip6_tnl_xmit(skb, dev);
1274 break;
1275 default:
1276 goto tx_err;
1277 }
1278
1279 if (ret < 0)
1280 goto tx_err;
1281
Patrick McHardy6ed10652009-06-23 06:03:08 +00001282 return NETDEV_TX_OK;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001283
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284tx_err:
1285 stats->tx_errors++;
1286 stats->tx_dropped++;
1287 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +00001288 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289}
1290
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001291static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292{
1293 struct net_device *dev = t->dev;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001294 struct __ip6_tnl_parm *p = &t->parms;
David S. Miller4c9483b2011-03-12 16:22:43 -05001295 struct flowi6 *fl6 = &t->fl.u.ip6;
Tom Herbert058214a2016-05-18 09:06:17 -07001296 int t_hlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297
Jiri Pirko3a6d54c2009-05-11 23:37:15 +00001298 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1299 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300
1301 /* Set up flowi template */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001302 fl6->saddr = p->laddr;
1303 fl6->daddr = p->raddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001304 fl6->flowi6_oif = p->link;
1305 fl6->flowlabel = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306
1307 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001308 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001310 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001312 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1313 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
1315 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1316 dev->flags |= IFF_POINTOPOINT;
1317 else
1318 dev->flags &= ~IFF_POINTOPOINT;
1319
Tom Herbert058214a2016-05-18 09:06:17 -07001320 t->tun_hlen = 0;
1321 t->hlen = t->encap_hlen + t->tun_hlen;
1322 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1323
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001325 int strict = (ipv6_addr_type(&p->raddr) &
1326 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1327
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001328 struct rt6_info *rt = rt6_lookup(t->net,
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001329 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001330 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
Ian Morris63159f22015-03-29 14:00:04 +01001332 if (!rt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 return;
1334
David S. Millerd1918542011-12-28 20:19:20 -05001335 if (rt->dst.dev) {
1336 dev->hard_header_len = rt->dst.dev->hard_header_len +
Tom Herbert058214a2016-05-18 09:06:17 -07001337 t_hlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
Tom Herbert058214a2016-05-18 09:06:17 -07001339 dev->mtu = rt->dst.dev->mtu - t_hlen;
Anders Franzen381601e2010-11-24 05:47:18 +00001340 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
Ian Morris67ba4152014-08-24 21:53:10 +01001341 dev->mtu -= 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342
1343 if (dev->mtu < IPV6_MIN_MTU)
1344 dev->mtu = IPV6_MIN_MTU;
1345 }
Amerigo Wang94e187c2012-10-29 00:13:19 +00001346 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 }
1348}
1349
1350/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001351 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 * @t: tunnel to be changed
1353 * @p: tunnel configuration parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 *
1355 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001356 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 **/
1358
1359static int
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001360ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361{
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001362 t->parms.laddr = p->laddr;
1363 t->parms.raddr = p->raddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 t->parms.flags = p->flags;
1365 t->parms.hop_limit = p->hop_limit;
1366 t->parms.encap_limit = p->encap_limit;
1367 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001368 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001369 t->parms.proto = p->proto;
Paolo Abeni607f7252016-02-12 15:43:54 +01001370 dst_cache_reset(&t->dst_cache);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001371 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 return 0;
1373}
1374
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001375static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1376{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001377 struct net *net = t->net;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001378 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1379 int err;
1380
1381 ip6_tnl_unlink(ip6n, t);
1382 synchronize_net();
1383 err = ip6_tnl_change(t, p);
1384 ip6_tnl_link(ip6n, t);
1385 netdev_state_change(t->dev);
1386 return err;
1387}
1388
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001389static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1390{
1391 /* for default tnl0 device allow to change only the proto */
1392 t->parms.proto = p->proto;
1393 netdev_state_change(t->dev);
1394 return 0;
1395}
1396
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001397static void
1398ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1399{
1400 p->laddr = u->laddr;
1401 p->raddr = u->raddr;
1402 p->flags = u->flags;
1403 p->hop_limit = u->hop_limit;
1404 p->encap_limit = u->encap_limit;
1405 p->flowinfo = u->flowinfo;
1406 p->link = u->link;
1407 p->proto = u->proto;
1408 memcpy(p->name, u->name, sizeof(u->name));
1409}
1410
1411static void
1412ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1413{
1414 u->laddr = p->laddr;
1415 u->raddr = p->raddr;
1416 u->flags = p->flags;
1417 u->hop_limit = p->hop_limit;
1418 u->encap_limit = p->encap_limit;
1419 u->flowinfo = p->flowinfo;
1420 u->link = p->link;
1421 u->proto = p->proto;
1422 memcpy(u->name, p->name, sizeof(u->name));
1423}
1424
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001426 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427 * @dev: virtual device associated with tunnel
1428 * @ifr: parameters passed from userspace
1429 * @cmd: command to be performed
1430 *
1431 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001432 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001433 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 *
1435 * The possible commands are the following:
1436 * %SIOCGETTUNNEL: get tunnel parameters for device
1437 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1438 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1439 * %SIOCDELTUNNEL: delete tunnel
1440 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001441 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 * initialization, can be used for creating other tunnel devices.
1443 *
1444 * Return:
1445 * 0 on success,
1446 * %-EFAULT if unable to copy data to or from userspace,
1447 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1448 * %-EINVAL if passed tunnel parameters are invalid,
1449 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1450 * %-ENODEV if attempting to change or delete a nonexisting device
1451 **/
1452
1453static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001454ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455{
1456 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 struct ip6_tnl_parm p;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001458 struct __ip6_tnl_parm p1;
Nicolas Dichtel74462f02014-04-16 11:19:34 +02001459 struct ip6_tnl *t = netdev_priv(dev);
1460 struct net *net = t->net;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001461 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462
Tom Herbert0d3c7032016-04-29 17:12:15 -07001463 memset(&p1, 0, sizeof(p1));
1464
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 switch (cmd) {
1466 case SIOCGETTUNNEL:
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001467 if (dev == ip6n->fb_tnl_dev) {
Ian Morris67ba4152014-08-24 21:53:10 +01001468 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 err = -EFAULT;
1470 break;
1471 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001472 ip6_tnl_parm_from_user(&p1, &p);
1473 t = ip6_tnl_locate(net, &p1, 0);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001474 if (IS_ERR(t))
Nicolas Dichtel74462f02014-04-16 11:19:34 +02001475 t = netdev_priv(dev);
Dan Carpenter5ef5d6c2012-08-16 03:14:04 +00001476 } else {
1477 memset(&p, 0, sizeof(p));
Ville Nuorvala567131a2006-11-24 17:05:41 -08001478 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001479 ip6_tnl_parm_to_user(&p, &t->parms);
Ian Morris67ba4152014-08-24 21:53:10 +01001480 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 err = -EFAULT;
1482 }
1483 break;
1484 case SIOCADDTUNNEL:
1485 case SIOCCHGTUNNEL:
1486 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001487 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001489 err = -EFAULT;
Ian Morris67ba4152014-08-24 21:53:10 +01001490 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001492 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001493 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1494 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 break;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001496 ip6_tnl_parm_from_user(&p1, &p);
1497 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001498 if (cmd == SIOCCHGTUNNEL) {
Nicolas Dichtel37355562015-03-16 15:56:05 +01001499 if (!IS_ERR(t)) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001500 if (t->dev != dev) {
1501 err = -EEXIST;
1502 break;
1503 }
1504 } else
1505 t = netdev_priv(dev);
Alexey Andriyanovacf722f2014-10-29 10:54:52 +03001506 if (dev == ip6n->fb_tnl_dev)
1507 err = ip6_tnl0_update(t, &p1);
1508 else
1509 err = ip6_tnl_update(t, &p1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 }
Nicolas Dichtel37355562015-03-16 15:56:05 +01001511 if (!IS_ERR(t)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 err = 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001513 ip6_tnl_parm_to_user(&p, &t->parms);
1514 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
Ville Nuorvala567131a2006-11-24 17:05:41 -08001515 err = -EFAULT;
1516
Nicolas Dichtel37355562015-03-16 15:56:05 +01001517 } else {
1518 err = PTR_ERR(t);
1519 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 break;
1521 case SIOCDELTUNNEL:
1522 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 break;
1525
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001526 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001527 err = -EFAULT;
Ian Morris67ba4152014-08-24 21:53:10 +01001528 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001530 err = -ENOENT;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001531 ip6_tnl_parm_from_user(&p1, &p);
1532 t = ip6_tnl_locate(net, &p1, 0);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001533 if (IS_ERR(t))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001535 err = -EPERM;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001536 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001538 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001540 err = 0;
1541 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 break;
1543 default:
1544 err = -EINVAL;
1545 }
1546 return err;
1547}
1548
1549/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001550 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551 * @dev: virtual device associated with tunnel
1552 * @new_mtu: the new mtu
1553 *
1554 * Return:
1555 * 0 on success,
1556 * %-EINVAL if mtu too small
1557 **/
1558
Tom Herbert79ecb902016-04-29 17:12:20 -07001559int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560{
Oussama Ghorbel582442d2013-10-03 14:49:26 +01001561 struct ip6_tnl *tnl = netdev_priv(dev);
1562
1563 if (tnl->parms.proto == IPPROTO_IPIP) {
1564 if (new_mtu < 68)
1565 return -EINVAL;
1566 } else {
1567 if (new_mtu < IPV6_MIN_MTU)
1568 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 }
Oussama Ghorbel582442d2013-10-03 14:49:26 +01001570 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1571 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 dev->mtu = new_mtu;
1573 return 0;
1574}
Tom Herbert79ecb902016-04-29 17:12:20 -07001575EXPORT_SYMBOL(ip6_tnl_change_mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576
Nicolas Dichtelecf2c062015-04-02 17:07:01 +02001577int ip6_tnl_get_iflink(const struct net_device *dev)
1578{
1579 struct ip6_tnl *t = netdev_priv(dev);
1580
1581 return t->parms.link;
1582}
1583EXPORT_SYMBOL(ip6_tnl_get_iflink);
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001584
Tom Herbert058214a2016-05-18 09:06:17 -07001585int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1586 unsigned int num)
1587{
1588 if (num >= MAX_IPTUN_ENCAP_OPS)
1589 return -ERANGE;
1590
1591 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1592 &ip6tun_encaps[num],
1593 NULL, ops) ? 0 : -1;
1594}
1595EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1596
1597int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1598 unsigned int num)
1599{
1600 int ret;
1601
1602 if (num >= MAX_IPTUN_ENCAP_OPS)
1603 return -ERANGE;
1604
1605 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1606 &ip6tun_encaps[num],
1607 ops, NULL) == ops) ? 0 : -1;
1608
1609 synchronize_net();
1610
1611 return ret;
1612}
1613EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1614
1615int ip6_tnl_encap_setup(struct ip6_tnl *t,
1616 struct ip_tunnel_encap *ipencap)
1617{
1618 int hlen;
1619
1620 memset(&t->encap, 0, sizeof(t->encap));
1621
1622 hlen = ip6_encap_hlen(ipencap);
1623 if (hlen < 0)
1624 return hlen;
1625
1626 t->encap.type = ipencap->type;
1627 t->encap.sport = ipencap->sport;
1628 t->encap.dport = ipencap->dport;
1629 t->encap.flags = ipencap->flags;
1630
1631 t->encap_hlen = hlen;
1632 t->hlen = t->encap_hlen + t->tun_hlen;
1633
1634 return 0;
1635}
1636EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1637
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001638static const struct net_device_ops ip6_tnl_netdev_ops = {
Steffen Klassert6c6151d2014-11-03 09:19:27 +01001639 .ndo_init = ip6_tnl_dev_init,
Eric Dumazet8560f222010-09-28 03:23:34 +00001640 .ndo_uninit = ip6_tnl_dev_uninit,
Tom Herbert8eb30be2016-04-29 17:12:18 -07001641 .ndo_start_xmit = ip6_tnl_start_xmit,
Eric Dumazet8560f222010-09-28 03:23:34 +00001642 .ndo_do_ioctl = ip6_tnl_ioctl,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001643 .ndo_change_mtu = ip6_tnl_change_mtu,
Eric Dumazet8560f222010-09-28 03:23:34 +00001644 .ndo_get_stats = ip6_get_stats,
Nicolas Dichtelecf2c062015-04-02 17:07:01 +02001645 .ndo_get_iflink = ip6_tnl_get_iflink,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001646};
1647
Tom Herbert51c052d2016-05-18 09:06:21 -07001648#define IPXIPX_FEATURES (NETIF_F_SG | \
1649 NETIF_F_FRAGLIST | \
1650 NETIF_F_HIGHDMA | \
1651 NETIF_F_GSO_SOFTWARE | \
1652 NETIF_F_HW_CSUM)
Eric Dumazet8560f222010-09-28 03:23:34 +00001653
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001655 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 * @dev: virtual device associated with tunnel
1657 *
1658 * Description:
1659 * Initialize function pointers and device parameters
1660 **/
1661
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001662static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001664 dev->netdev_ops = &ip6_tnl_netdev_ops;
Eric Dumazet8560f222010-09-28 03:23:34 +00001665 dev->destructor = ip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666
1667 dev->type = ARPHRD_TUNNEL6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 dev->flags |= IFF_NOARP;
1669 dev->addr_len = sizeof(struct in6_addr);
Tom Herbert058214a2016-05-18 09:06:17 -07001670 dev->features |= NETIF_F_LLTX;
Eric Dumazet02875872014-10-05 18:38:35 -07001671 netif_keep_dst(dev);
Tom Herbert51c052d2016-05-18 09:06:21 -07001672
1673 dev->features |= IPXIPX_FEATURES;
1674 dev->hw_features |= IPXIPX_FEATURES;
1675
Nicolas Dichtele8377352013-08-20 12:16:06 +02001676 /* This perm addr will be used as interface identifier by IPv6 */
1677 dev->addr_assign_type = NET_ADDR_RANDOM;
1678 eth_random_addr(dev->perm_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679}
1680
1681
1682/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001683 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 * @dev: virtual device associated with tunnel
1685 **/
1686
Eric Dumazet8560f222010-09-28 03:23:34 +00001687static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001688ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689{
Patrick McHardy2941a482006-01-08 22:05:26 -08001690 struct ip6_tnl *t = netdev_priv(dev);
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001691 int ret;
Tom Herbert058214a2016-05-18 09:06:17 -07001692 int t_hlen;
Eric Dumazet8560f222010-09-28 03:23:34 +00001693
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 t->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001695 t->net = dev_net(dev);
WANG Cong1c213bd2014-02-13 11:46:28 -08001696 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Eric Dumazet8560f222010-09-28 03:23:34 +00001697 if (!dev->tstats)
1698 return -ENOMEM;
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001699
Paolo Abeni607f7252016-02-12 15:43:54 +01001700 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
Tom Herbert0d3c7032016-04-29 17:12:15 -07001701 if (ret)
1702 goto free_stats;
1703
1704 ret = gro_cells_init(&t->gro_cells, dev);
1705 if (ret)
1706 goto destroy_dst;
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001707
Tom Herbert79ecb902016-04-29 17:12:20 -07001708 t->tun_hlen = 0;
Tom Herbert058214a2016-05-18 09:06:17 -07001709 t->hlen = t->encap_hlen + t->tun_hlen;
1710 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1711
1712 dev->type = ARPHRD_TUNNEL6;
1713 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1714 dev->mtu = ETH_DATA_LEN - t_hlen;
1715 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1716 dev->mtu -= 8;
Tom Herbert79ecb902016-04-29 17:12:20 -07001717
Eric Dumazet8560f222010-09-28 03:23:34 +00001718 return 0;
Tom Herbert0d3c7032016-04-29 17:12:15 -07001719
1720destroy_dst:
1721 dst_cache_destroy(&t->dst_cache);
1722free_stats:
1723 free_percpu(dev->tstats);
1724 dev->tstats = NULL;
1725
1726 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727}
1728
1729/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001730 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 * @dev: virtual device associated with tunnel
1732 **/
1733
Eric Dumazet8560f222010-09-28 03:23:34 +00001734static int ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735{
Patrick McHardy2941a482006-01-08 22:05:26 -08001736 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001737 int err = ip6_tnl_dev_init_gen(dev);
1738
1739 if (err)
1740 return err;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001741 ip6_tnl_link_config(t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001742 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743}
1744
1745/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001746 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 * @dev: fallback device
1748 *
1749 * Return: 0
1750 **/
1751
Eric Dumazet8560f222010-09-28 03:23:34 +00001752static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753{
Patrick McHardy2941a482006-01-08 22:05:26 -08001754 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001755 struct net *net = dev_net(dev);
1756 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Eric Dumazet8560f222010-09-28 03:23:34 +00001757
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001758 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759 dev_hold(dev);
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001760
Eric Dumazetcf778b02012-01-12 04:41:32 +00001761 rcu_assign_pointer(ip6n->tnls_wc[0], t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001762 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763}
1764
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001765static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1766{
1767 u8 proto;
1768
Susant Sahanic8965932014-05-10 00:11:32 +05301769 if (!data || !data[IFLA_IPTUN_PROTO])
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001770 return 0;
1771
1772 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1773 if (proto != IPPROTO_IPV6 &&
1774 proto != IPPROTO_IPIP &&
1775 proto != 0)
1776 return -EINVAL;
1777
1778 return 0;
1779}
1780
1781static void ip6_tnl_netlink_parms(struct nlattr *data[],
1782 struct __ip6_tnl_parm *parms)
1783{
1784 memset(parms, 0, sizeof(*parms));
1785
1786 if (!data)
1787 return;
1788
1789 if (data[IFLA_IPTUN_LINK])
1790 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1791
1792 if (data[IFLA_IPTUN_LOCAL])
Jiri Benc67b61f62015-03-29 16:59:26 +02001793 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001794
1795 if (data[IFLA_IPTUN_REMOTE])
Jiri Benc67b61f62015-03-29 16:59:26 +02001796 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001797
1798 if (data[IFLA_IPTUN_TTL])
1799 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1800
1801 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1802 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1803
1804 if (data[IFLA_IPTUN_FLOWINFO])
Nicolas Dichtel1ff05fb2012-11-15 04:06:42 +00001805 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001806
1807 if (data[IFLA_IPTUN_FLAGS])
1808 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1809
1810 if (data[IFLA_IPTUN_PROTO])
1811 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1812}
1813
Tom Herbertb3a27b52016-05-18 09:06:20 -07001814static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1815 struct ip_tunnel_encap *ipencap)
1816{
1817 bool ret = false;
1818
1819 memset(ipencap, 0, sizeof(*ipencap));
1820
1821 if (!data)
1822 return ret;
1823
1824 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1825 ret = true;
1826 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1827 }
1828
1829 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1830 ret = true;
1831 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1832 }
1833
1834 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1835 ret = true;
1836 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1837 }
1838
1839 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1840 ret = true;
1841 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1842 }
1843
1844 return ret;
1845}
1846
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001847static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1848 struct nlattr *tb[], struct nlattr *data[])
1849{
1850 struct net *net = dev_net(dev);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001851 struct ip6_tnl *nt, *t;
Tom Herbertb3a27b52016-05-18 09:06:20 -07001852 struct ip_tunnel_encap ipencap;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001853
1854 nt = netdev_priv(dev);
Tom Herbertb3a27b52016-05-18 09:06:20 -07001855
1856 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
1857 int err = ip6_tnl_encap_setup(nt, &ipencap);
1858
1859 if (err < 0)
1860 return err;
1861 }
1862
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001863 ip6_tnl_netlink_parms(data, &nt->parms);
1864
Nicolas Dichtel37355562015-03-16 15:56:05 +01001865 t = ip6_tnl_locate(net, &nt->parms, 0);
1866 if (!IS_ERR(t))
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001867 return -EEXIST;
1868
1869 return ip6_tnl_create2(dev);
1870}
1871
1872static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1873 struct nlattr *data[])
1874{
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001875 struct ip6_tnl *t = netdev_priv(dev);
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001876 struct __ip6_tnl_parm p;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001877 struct net *net = t->net;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001878 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Tom Herbertb3a27b52016-05-18 09:06:20 -07001879 struct ip_tunnel_encap ipencap;
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001880
1881 if (dev == ip6n->fb_tnl_dev)
1882 return -EINVAL;
1883
Tom Herbertb3a27b52016-05-18 09:06:20 -07001884 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
1885 int err = ip6_tnl_encap_setup(t, &ipencap);
1886
1887 if (err < 0)
1888 return err;
1889 }
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001890 ip6_tnl_netlink_parms(data, &p);
1891
1892 t = ip6_tnl_locate(net, &p, 0);
Nicolas Dichtel37355562015-03-16 15:56:05 +01001893 if (!IS_ERR(t)) {
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001894 if (t->dev != dev)
1895 return -EEXIST;
1896 } else
1897 t = netdev_priv(dev);
1898
1899 return ip6_tnl_update(t, &p);
1900}
1901
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01001902static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1903{
1904 struct net *net = dev_net(dev);
1905 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1906
1907 if (dev != ip6n->fb_tnl_dev)
1908 unregister_netdevice_queue(dev, head);
1909}
1910
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001911static size_t ip6_tnl_get_size(const struct net_device *dev)
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001912{
1913 return
1914 /* IFLA_IPTUN_LINK */
1915 nla_total_size(4) +
1916 /* IFLA_IPTUN_LOCAL */
1917 nla_total_size(sizeof(struct in6_addr)) +
1918 /* IFLA_IPTUN_REMOTE */
1919 nla_total_size(sizeof(struct in6_addr)) +
1920 /* IFLA_IPTUN_TTL */
1921 nla_total_size(1) +
1922 /* IFLA_IPTUN_ENCAP_LIMIT */
1923 nla_total_size(1) +
1924 /* IFLA_IPTUN_FLOWINFO */
1925 nla_total_size(4) +
1926 /* IFLA_IPTUN_FLAGS */
1927 nla_total_size(4) +
Nicolas Dichtelcfa323b2012-11-14 05:13:58 +00001928 /* IFLA_IPTUN_PROTO */
1929 nla_total_size(1) +
Tom Herbertb3a27b52016-05-18 09:06:20 -07001930 /* IFLA_IPTUN_ENCAP_TYPE */
1931 nla_total_size(2) +
1932 /* IFLA_IPTUN_ENCAP_FLAGS */
1933 nla_total_size(2) +
1934 /* IFLA_IPTUN_ENCAP_SPORT */
1935 nla_total_size(2) +
1936 /* IFLA_IPTUN_ENCAP_DPORT */
1937 nla_total_size(2) +
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001938 0;
1939}
1940
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00001941static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001942{
1943 struct ip6_tnl *tunnel = netdev_priv(dev);
1944 struct __ip6_tnl_parm *parm = &tunnel->parms;
1945
1946 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
Jiri Benc930345e2015-03-29 16:59:25 +02001947 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
1948 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001949 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1950 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1951 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
Nicolas Dichtelcfa323b2012-11-14 05:13:58 +00001952 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1953 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001954 goto nla_put_failure;
Tom Herbertb3a27b52016-05-18 09:06:20 -07001955
1956 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
1957 tunnel->encap.type) ||
1958 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
1959 tunnel->encap.sport) ||
1960 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
1961 tunnel->encap.dport) ||
1962 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
1963 tunnel->encap.flags))
1964 goto nla_put_failure;
1965
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001966 return 0;
1967
1968nla_put_failure:
1969 return -EMSGSIZE;
1970}
1971
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01001972struct net *ip6_tnl_get_link_net(const struct net_device *dev)
1973{
1974 struct ip6_tnl *tunnel = netdev_priv(dev);
1975
1976 return tunnel->net;
1977}
1978EXPORT_SYMBOL(ip6_tnl_get_link_net);
1979
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001980static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1981 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1982 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1983 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1984 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1985 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1986 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1987 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1988 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
Tom Herbertb3a27b52016-05-18 09:06:20 -07001989 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
1990 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
1991 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
1992 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001993};
1994
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001995static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1996 .kind = "ip6tnl",
1997 .maxtype = IFLA_IPTUN_MAX,
Nicolas Dichtel0b112452012-11-14 05:14:00 +00001998 .policy = ip6_tnl_policy,
Nicolas Dichtelc075b132012-11-09 06:10:01 +00001999 .priv_size = sizeof(struct ip6_tnl),
Nicolas Dichtel0b112452012-11-14 05:14:00 +00002000 .setup = ip6_tnl_dev_setup,
2001 .validate = ip6_tnl_validate,
2002 .newlink = ip6_tnl_newlink,
2003 .changelink = ip6_tnl_changelink,
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01002004 .dellink = ip6_tnl_dellink,
Nicolas Dichtelb58d7312012-11-14 05:13:59 +00002005 .get_size = ip6_tnl_get_size,
2006 .fill_info = ip6_tnl_fill_info,
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01002007 .get_link_net = ip6_tnl_get_link_net,
Nicolas Dichtelc075b132012-11-09 06:10:01 +00002008};
2009
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00002010static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09002011 .handler = ip4ip6_rcv,
2012 .err_handler = ip4ip6_err,
2013 .priority = 1,
2014};
2015
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00002016static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
Patrick McHardy03037702005-07-19 14:03:34 -07002017 .handler = ip6ip6_rcv,
2018 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08002019 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020};
2021
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01002022static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07002023{
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01002024 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02002025 struct net_device *dev, *aux;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07002026 int h;
2027 struct ip6_tnl *t;
Eric Dumazetcf4432f2009-10-28 05:16:51 +00002028 LIST_HEAD(list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07002029
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02002030 for_each_netdev_safe(net, dev, aux)
2031 if (dev->rtnl_link_ops == &ip6_link_ops)
2032 unregister_netdevice_queue(dev, &list);
2033
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07002034 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet94767632010-09-15 20:25:34 +00002035 t = rtnl_dereference(ip6n->tnls_r_l[h]);
Ian Morris53b24b82015-03-29 14:00:05 +01002036 while (t) {
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02002037 /* If dev is in the same netns, it has already
2038 * been added to the list by the previous loop.
2039 */
2040 if (!net_eq(dev_net(t->dev), net))
2041 unregister_netdevice_queue(t->dev, &list);
Eric Dumazet94767632010-09-15 20:25:34 +00002042 t = rtnl_dereference(t->next);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00002043 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07002044 }
2045
Eric Dumazetcf4432f2009-10-28 05:16:51 +00002046 unregister_netdevice_many(&list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07002047}
2048
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00002049static int __net_init ip6_tnl_init_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07002050{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00002051 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Josh Boyer731abb92011-11-10 15:10:23 +00002052 struct ip6_tnl *t = NULL;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07002053 int err;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07002054
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07002055 ip6n->tnls[0] = ip6n->tnls_wc;
2056 ip6n->tnls[1] = ip6n->tnls_r_l;
2057
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07002058 err = -ENOMEM;
2059 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
Tom Gundersenc835a672014-07-14 16:37:24 +02002060 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07002061
2062 if (!ip6n->fb_tnl_dev)
2063 goto err_alloc_dev;
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08002064 dev_net_set(ip6n->fb_tnl_dev, net);
Nicolas Dichtelbb814092013-10-01 18:05:00 +02002065 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02002066 /* FB netdevice is special: we have one, and only one per netns.
2067 * Allowing to move it to another netns is clearly unsafe.
2068 */
2069 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07002070
Eric Dumazet8560f222010-09-28 03:23:34 +00002071 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2072 if (err < 0)
2073 goto err_register;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07002074
2075 err = register_netdev(ip6n->fb_tnl_dev);
2076 if (err < 0)
2077 goto err_register;
Josh Boyer731abb92011-11-10 15:10:23 +00002078
2079 t = netdev_priv(ip6n->fb_tnl_dev);
2080
2081 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07002082 return 0;
2083
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07002084err_register:
Eric Dumazet8560f222010-09-28 03:23:34 +00002085 ip6_dev_free(ip6n->fb_tnl_dev);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07002086err_alloc_dev:
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07002087 return err;
2088}
2089
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00002090static void __net_exit ip6_tnl_exit_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07002091{
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07002092 rtnl_lock();
Nicolas Dichtel1e9f3d62013-11-14 15:47:03 +01002093 ip6_tnl_destroy_tunnels(net);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07002094 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07002095}
2096
2097static struct pernet_operations ip6_tnl_net_ops = {
2098 .init = ip6_tnl_init_net,
2099 .exit = ip6_tnl_exit_net,
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00002100 .id = &ip6_tnl_net_id,
2101 .size = sizeof(struct ip6_tnl_net),
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07002102};
2103
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104/**
2105 * ip6_tunnel_init - register protocol and reserve needed resources
2106 *
2107 * Return: 0 on success
2108 **/
2109
2110static int __init ip6_tunnel_init(void)
2111{
2112 int err;
2113
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00002114 err = register_pernet_device(&ip6_tnl_net_ops);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07002115 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00002116 goto out_pernet;
2117
2118 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2119 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00002120 pr_err("%s: can't register ip4ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00002121 goto out_ip4ip6;
2122 }
2123
2124 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2125 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00002126 pr_err("%s: can't register ip6ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00002127 goto out_ip6ip6;
2128 }
Nicolas Dichtelc075b132012-11-09 06:10:01 +00002129 err = rtnl_link_register(&ip6_link_ops);
2130 if (err < 0)
2131 goto rtnl_link_failed;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00002132
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133 return 0;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00002134
Nicolas Dichtelc075b132012-11-09 06:10:01 +00002135rtnl_link_failed:
2136 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00002137out_ip6ip6:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09002138 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00002139out_ip4ip6:
2140 unregister_pernet_device(&ip6_tnl_net_ops);
2141out_pernet:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142 return err;
2143}
2144
2145/**
2146 * ip6_tunnel_cleanup - free resources and unregister protocol
2147 **/
2148
2149static void __exit ip6_tunnel_cleanup(void)
2150{
Nicolas Dichtelc075b132012-11-09 06:10:01 +00002151 rtnl_link_unregister(&ip6_link_ops);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09002152 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Joe Perchesf3213832012-05-15 14:11:53 +00002153 pr_info("%s: can't deregister ip4ip6\n", __func__);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09002154
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08002155 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Joe Perchesf3213832012-05-15 14:11:53 +00002156 pr_info("%s: can't deregister ip6ip6\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00002158 unregister_pernet_device(&ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159}
2160
2161module_init(ip6_tunnel_init);
2162module_exit(ip6_tunnel_cleanup);