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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Yasuyuki Kozakaic4d3efa2007-02-15 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 Kozakaic4d3efa2007-02-15 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 Kozakaic4d3efa2007-02-15 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 Kozakaic4d3efa2007-02-15 00:43:16 +090028#include <linux/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/if.h>
30#include <linux/in.h>
31#include <linux/ip.h>
32#include <linux/if_tunnel.h>
33#include <linux/net.h>
34#include <linux/in6.h>
35#include <linux/netdevice.h>
36#include <linux/if_arp.h>
37#include <linux/icmpv6.h>
38#include <linux/init.h>
39#include <linux/route.h>
40#include <linux/rtnetlink.h>
41#include <linux/netfilter_ipv6.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090042#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44#include <asm/uaccess.h>
Arun Sharma600634972011-07-26 16:09:06 -070045#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +090047#include <net/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <net/ip.h>
49#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <net/ip6_route.h>
51#include <net/addrconf.h>
52#include <net/ip6_tunnel.h>
53#include <net/xfrm.h>
54#include <net/dsfield.h>
55#include <net/inet_ecn.h>
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070056#include <net/net_namespace.h>
57#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59MODULE_AUTHOR("Ville Nuorvala");
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +090060MODULE_DESCRIPTION("IPv6 tunneling device");
Linus Torvalds1da177e2005-04-16 15:20:36 -070061MODULE_LICENSE("GPL");
stephen hemminger6dfbd872011-03-10 11:43:19 +000062MODULE_ALIAS_NETDEV("ip6tnl0");
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#ifdef IP6_TNL_DEBUG
Joe Perches91df42b2012-05-15 14:11:54 +000065#define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#else
67#define IP6_TNL_TRACE(x...) do {;} while(0)
68#endif
69
70#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +090071#define IPV6_TCLASS_SHIFT 20
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73#define HASH_SIZE 32
74
Al Viroe69a4ad2006-11-14 20:56:00 -080075#define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090076 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
77 (HASH_SIZE - 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Eric Dumazet8560f222010-09-28 03:23:34 +000079static int ip6_tnl_dev_init(struct net_device *dev);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +090080static void ip6_tnl_dev_setup(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Eric Dumazetf99189b2009-11-17 10:42:49 +000082static int ip6_tnl_net_id __read_mostly;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070083struct ip6_tnl_net {
Pavel Emelyanov15820e1292008-04-16 01:23:02 -070084 /* the IPv6 tunnel fallback device */
85 struct net_device *fb_tnl_dev;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -070086 /* lists for storing tunnels in use */
Eric Dumazet94767632010-09-15 20:25:34 +000087 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
88 struct ip6_tnl __rcu *tnls_wc[1];
89 struct ip6_tnl __rcu **tnls[2];
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070090};
91
Eric Dumazet8560f222010-09-28 03:23:34 +000092/* often modified stats are per cpu, other are shared (netdev->stats) */
93struct pcpu_tstats {
94 unsigned long rx_packets;
95 unsigned long rx_bytes;
96 unsigned long tx_packets;
97 unsigned long tx_bytes;
Eric Dumazet8ce120f2011-11-04 23:19:28 +000098} __attribute__((aligned(4*sizeof(unsigned long))));
Eric Dumazet8560f222010-09-28 03:23:34 +000099
100static struct net_device_stats *ip6_get_stats(struct net_device *dev)
101{
102 struct pcpu_tstats sum = { 0 };
103 int i;
104
105 for_each_possible_cpu(i) {
106 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
107
108 sum.rx_packets += tstats->rx_packets;
109 sum.rx_bytes += tstats->rx_bytes;
110 sum.tx_packets += tstats->tx_packets;
111 sum.tx_bytes += tstats->tx_bytes;
112 }
113 dev->stats.rx_packets = sum.rx_packets;
114 dev->stats.rx_bytes = sum.rx_bytes;
115 dev->stats.tx_packets = sum.tx_packets;
116 dev->stats.tx_bytes = sum.tx_bytes;
117 return &dev->stats;
118}
119
Eric Dumazet2922bc82009-10-23 06:34:34 +0000120/*
Eric Dumazet94767632010-09-15 20:25:34 +0000121 * Locking : hash tables are protected by RCU and RTNL
Eric Dumazet2922bc82009-10-23 06:34:34 +0000122 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
125{
126 struct dst_entry *dst = t->dst_cache;
127
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900128 if (dst && dst->obsolete &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 dst->ops->check(dst, t->dst_cookie) == NULL) {
130 t->dst_cache = NULL;
131 dst_release(dst);
132 return NULL;
133 }
134
135 return dst;
136}
137
138static inline void ip6_tnl_dst_reset(struct ip6_tnl *t)
139{
140 dst_release(t->dst_cache);
141 t->dst_cache = NULL;
142}
143
144static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
145{
146 struct rt6_info *rt = (struct rt6_info *) dst;
147 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
148 dst_release(t->dst_cache);
149 t->dst_cache = dst;
150}
151
152/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900153 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900154 * @remote: the address of the tunnel exit-point
155 * @local: the address of the tunnel entry-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900157 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 * tunnel matching given end-points if found,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900159 * else fallback tunnel if its device is up,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 * else %NULL
161 **/
162
Eric Dumazet2922bc82009-10-23 06:34:34 +0000163#define for_each_ip6_tunnel_rcu(start) \
164 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166static struct ip6_tnl *
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000167ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
Eric Dumazet94767632010-09-15 20:25:34 +0000169 unsigned int h0 = HASH(remote);
170 unsigned int h1 = HASH(local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 struct ip6_tnl *t;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700172 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Eric Dumazet2922bc82009-10-23 06:34:34 +0000174 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 if (ipv6_addr_equal(local, &t->parms.laddr) &&
176 ipv6_addr_equal(remote, &t->parms.raddr) &&
177 (t->dev->flags & IFF_UP))
178 return t;
179 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000180 t = rcu_dereference(ip6n->tnls_wc[0]);
181 if (t && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 return t;
183
184 return NULL;
185}
186
187/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900188 * ip6_tnl_bucket - get head of list matching given tunnel parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900189 * @p: parameters containing tunnel end-points
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 *
191 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900192 * ip6_tnl_bucket() returns the head of the list matching the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 * &struct in6_addr entries laddr and raddr in @p.
194 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900195 * Return: head of IPv6 tunnel list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 **/
197
Eric Dumazet94767632010-09-15 20:25:34 +0000198static struct ip6_tnl __rcu **
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000199ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000201 const struct in6_addr *remote = &p->raddr;
202 const struct in6_addr *local = &p->laddr;
Eric Dumazet95c96172012-04-15 05:58:06 +0000203 unsigned int h = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 int prio = 0;
205
206 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
207 prio = 1;
208 h = HASH(remote) ^ HASH(local);
209 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700210 return &ip6n->tnls[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211}
212
213/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900214 * ip6_tnl_link - add tunnel to hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 * @t: tunnel to be added
216 **/
217
218static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700219ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
Eric Dumazet94767632010-09-15 20:25:34 +0000221 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Eric Dumazetcf778b02012-01-12 04:41:32 +0000223 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
224 rcu_assign_pointer(*tp, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225}
226
227/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900228 * ip6_tnl_unlink - remove tunnel from hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 * @t: tunnel to be removed
230 **/
231
232static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700233ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234{
Eric Dumazet94767632010-09-15 20:25:34 +0000235 struct ip6_tnl __rcu **tp;
236 struct ip6_tnl *iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Eric Dumazet94767632010-09-15 20:25:34 +0000238 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
239 (iter = rtnl_dereference(*tp)) != NULL;
240 tp = &iter->next) {
241 if (t == iter) {
Eric Dumazetcf778b02012-01-12 04:41:32 +0000242 rcu_assign_pointer(*tp, t->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 break;
244 }
245 }
246}
247
Eric Dumazet8560f222010-09-28 03:23:34 +0000248static void ip6_dev_free(struct net_device *dev)
249{
250 free_percpu(dev->tstats);
251 free_netdev(dev);
252}
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000255 * ip6_tnl_create - create a new tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 * @p: tunnel parameters
257 * @pt: pointer to new tunnel
258 *
259 * Description:
260 * Create tunnel matching given parameters.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900261 *
262 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800263 * created tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 **/
265
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700266static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
268 struct net_device *dev;
269 struct ip6_tnl *t;
270 char name[IFNAMSIZ];
271 int err;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700272 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800274 if (p->name[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 strlcpy(name, p->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800276 else
277 sprintf(name, "ip6tnl%%d");
278
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900279 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (dev == NULL)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800281 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Pavel Emelyanov554eb272008-04-16 01:24:13 -0700283 dev_net_set(dev, net);
284
Patrick McHardy2941a482006-01-08 22:05:26 -0800285 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 t->parms = *p;
Eric Dumazet8560f222010-09-28 03:23:34 +0000287 err = ip6_tnl_dev_init(dev);
288 if (err < 0)
289 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800291 if ((err = register_netdevice(dev)) < 0)
292 goto failed_free;
293
Josh Boyer731abb92011-11-10 15:10:23 +0000294 strcpy(t->parms.name, dev->name);
295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 dev_hold(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700297 ip6_tnl_link(ip6n, t);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800298 return t;
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800299
300failed_free:
Eric Dumazet8560f222010-09-28 03:23:34 +0000301 ip6_dev_free(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800302failed:
303 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304}
305
306/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900307 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900308 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 * @create: != 0 if allowed to create new tunnel if no match found
310 *
311 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900312 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 * based on @parms. If this is unsuccessful, but @create is set a new
314 * tunnel device is created and registered for use.
315 *
316 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800317 * matching tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 **/
319
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700320static struct ip6_tnl *ip6_tnl_locate(struct net *net,
321 struct ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000323 const struct in6_addr *remote = &p->raddr;
324 const struct in6_addr *local = &p->laddr;
Eric Dumazet94767632010-09-15 20:25:34 +0000325 struct ip6_tnl __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700327 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Eric Dumazet94767632010-09-15 20:25:34 +0000329 for (tp = ip6_tnl_bucket(ip6n, p);
330 (t = rtnl_dereference(*tp)) != NULL;
331 tp = &t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Ville Nuorvala567131a2006-11-24 17:05:41 -0800333 ipv6_addr_equal(remote, &t->parms.raddr))
334 return t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 }
336 if (!create)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800337 return NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700338 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339}
340
341/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900342 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900344 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900346 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 **/
348
349static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900350ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
Patrick McHardy2941a482006-01-08 22:05:26 -0800352 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700353 struct net *net = dev_net(dev);
354 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Eric Dumazet94767632010-09-15 20:25:34 +0000356 if (dev == ip6n->fb_tnl_dev)
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000357 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
Eric Dumazet94767632010-09-15 20:25:34 +0000358 else
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700359 ip6_tnl_unlink(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 ip6_tnl_dst_reset(t);
361 dev_put(dev);
362}
363
364/**
365 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
366 * @skb: received socket buffer
367 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900368 * Return:
369 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 * else index to encapsulation limit
371 **/
372
373static __u16
374parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
375{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000376 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 __u8 nexthdr = ipv6h->nexthdr;
378 __u16 off = sizeof (*ipv6h);
379
380 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
381 __u16 optlen = 0;
382 struct ipv6_opt_hdr *hdr;
383 if (raw + off + sizeof (*hdr) > skb->data &&
384 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
385 break;
386
387 hdr = (struct ipv6_opt_hdr *) (raw + off);
388 if (nexthdr == NEXTHDR_FRAGMENT) {
389 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
390 if (frag_hdr->frag_off)
391 break;
392 optlen = 8;
393 } else if (nexthdr == NEXTHDR_AUTH) {
394 optlen = (hdr->hdrlen + 2) << 2;
395 } else {
396 optlen = ipv6_optlen(hdr);
397 }
398 if (nexthdr == NEXTHDR_DEST) {
399 __u16 i = off + 2;
400 while (1) {
401 struct ipv6_tlv_tnl_enc_lim *tel;
402
403 /* No more room for encapsulation limit */
404 if (i + sizeof (*tel) > off + optlen)
405 break;
406
407 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
408 /* return index of option if found and valid */
409 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
410 tel->length == 1)
411 return i;
412 /* else jump to next option */
413 if (tel->type)
414 i += tel->length + 2;
415 else
416 i++;
417 }
418 }
419 nexthdr = hdr->nexthdr;
420 off += optlen;
421 }
422 return 0;
423}
424
425/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900426 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 *
428 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900429 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 * to the specifications in RFC 2473.
431 **/
432
Herbert Xud2acc342006-03-28 01:12:13 -0800433static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900434ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700435 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000437 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 struct ip6_tnl *t;
439 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700440 u8 rel_type = ICMPV6_DEST_UNREACH;
441 u8 rel_code = ICMPV6_ADDR_UNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 __u32 rel_info = 0;
443 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800444 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900446 /* If the packet doesn't contain the original IPv6 header we are
447 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 processing of the error. */
449
Eric Dumazet2922bc82009-10-23 06:34:34 +0000450 rcu_read_lock();
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700451 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700452 &ipv6h->saddr)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 goto out;
454
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900455 if (t->parms.proto != ipproto && t->parms.proto != 0)
456 goto out;
457
Herbert Xud2acc342006-03-28 01:12:13 -0800458 err = 0;
459
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900460 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 __u32 teli;
462 struct ipv6_tlv_tnl_enc_lim *tel;
463 __u32 mtu;
464 case ICMPV6_DEST_UNREACH:
Joe Perchese87cc472012-05-13 21:56:26 +0000465 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
466 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 rel_msg = 1;
468 break;
469 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900470 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Joe Perchese87cc472012-05-13 21:56:26 +0000471 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
472 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 rel_msg = 1;
474 }
475 break;
476 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800477 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900478 if ((*code) == ICMPV6_HDR_FIELD)
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800479 teli = parse_tlv_tnl_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
Al Viro704eae12007-07-26 17:33:29 +0100481 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
483 if (tel->encap_limit == 0) {
Joe Perchese87cc472012-05-13 21:56:26 +0000484 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
485 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 rel_msg = 1;
487 }
Joe Perchese87cc472012-05-13 21:56:26 +0000488 } else {
489 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
490 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
492 break;
493 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100494 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 if (mtu < IPV6_MIN_MTU)
496 mtu = IPV6_MIN_MTU;
497 t->dev->mtu = mtu;
498
Al Virocc6cdac2006-02-18 16:02:18 -0500499 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 rel_type = ICMPV6_PKT_TOOBIG;
501 rel_code = 0;
502 rel_info = mtu;
503 rel_msg = 1;
504 }
505 break;
506 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900507
508 *type = rel_type;
509 *code = rel_code;
510 *info = rel_info;
511 *msg = rel_msg;
512
513out:
Eric Dumazet2922bc82009-10-23 06:34:34 +0000514 rcu_read_unlock();
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900515 return err;
516}
517
518static int
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900519ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700520 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900521{
522 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700523 u8 rel_type = type;
524 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100525 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900526 int err;
527 struct sk_buff *skb2;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000528 const struct iphdr *eiph;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900529 struct rtable *rt;
David S. Miller31e4543d2011-05-03 20:25:42 -0700530 struct flowi4 fl4;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900531
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900532 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
533 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900534 if (err < 0)
535 return err;
536
537 if (rel_msg == 0)
538 return 0;
539
540 switch (rel_type) {
541 case ICMPV6_DEST_UNREACH:
542 if (rel_code != ICMPV6_ADDR_UNREACH)
543 return 0;
544 rel_type = ICMP_DEST_UNREACH;
545 rel_code = ICMP_HOST_UNREACH;
546 break;
547 case ICMPV6_PKT_TOOBIG:
548 if (rel_code != 0)
549 return 0;
550 rel_type = ICMP_DEST_UNREACH;
551 rel_code = ICMP_FRAG_NEEDED;
552 break;
553 default:
554 return 0;
555 }
556
557 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
558 return 0;
559
560 skb2 = skb_clone(skb, GFP_ATOMIC);
561 if (!skb2)
562 return 0;
563
Eric Dumazetadf30902009-06-02 05:19:30 +0000564 skb_dst_drop(skb2);
565
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900566 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700567 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700568 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900569
570 /* Try to guess incoming interface */
David S. Miller31e4543d2011-05-03 20:25:42 -0700571 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500572 eiph->saddr, 0,
573 0, 0,
574 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800575 if (IS_ERR(rt))
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900576 goto out;
577
Changli Gaod8d1f302010-06-10 23:31:35 -0700578 skb2->dev = rt->dst.dev;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900579
580 /* route "incoming" packet */
581 if (rt->rt_flags & RTCF_LOCAL) {
582 ip_rt_put(rt);
583 rt = NULL;
David S. Miller31e4543d2011-05-03 20:25:42 -0700584 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500585 eiph->daddr, eiph->saddr,
586 0, 0,
587 IPPROTO_IPIP,
588 RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800589 if (IS_ERR(rt) ||
Changli Gaod8d1f302010-06-10 23:31:35 -0700590 rt->dst.dev->type != ARPHRD_TUNNEL) {
David S. Millerb23dd4f2011-03-02 14:31:35 -0800591 if (!IS_ERR(rt))
592 ip_rt_put(rt);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900593 goto out;
594 }
David S. Millerb23dd4f2011-03-02 14:31:35 -0800595 skb_dst_set(skb2, &rt->dst);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900596 } else {
597 ip_rt_put(rt);
598 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
599 skb2->dev) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000600 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900601 goto out;
602 }
603
604 /* change mtu on this route */
605 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000606 if (rel_info > dst_mtu(skb_dst(skb2)))
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900607 goto out;
608
Eric Dumazetadf30902009-06-02 05:19:30 +0000609 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900610 }
611
Al Viro704eae12007-07-26 17:33:29 +0100612 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900613
614out:
615 kfree_skb(skb2);
616 return 0;
617}
618
619static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900620ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700621 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900622{
623 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700624 u8 rel_type = type;
625 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100626 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900627 int err;
628
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900629 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
630 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900631 if (err < 0)
632 return err;
633
634 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 struct rt6_info *rt;
636 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900639 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
Eric Dumazetadf30902009-06-02 05:19:30 +0000641 skb_dst_drop(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700643 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
645 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700646 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
647 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
David S. Millerd1918542011-12-28 20:19:20 -0500649 if (rt && rt->dst.dev)
650 skb2->dev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000652 icmpv6_send(skb2, rel_type, rel_code, rel_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653
654 if (rt)
Changli Gaod8d1f302010-06-10 23:31:35 -0700655 dst_release(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
657 kfree_skb(skb2);
658 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900659
660 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661}
662
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000663static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
664 const struct ipv6hdr *ipv6h,
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900665 struct sk_buff *skb)
666{
667 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
668
669 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700670 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900671
672 if (INET_ECN_is_ce(dsfield))
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700673 IP_ECN_set_ce(ip_hdr(skb));
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900674}
675
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000676static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
677 const struct ipv6hdr *ipv6h,
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900678 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900680 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b42007-11-13 21:40:13 -0800681 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900683 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700684 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900686
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000687static __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
688 const struct in6_addr *laddr,
689 const struct in6_addr *raddr)
690{
691 struct ip6_tnl_parm *p = &t->parms;
692 int ltype = ipv6_addr_type(laddr);
693 int rtype = ipv6_addr_type(raddr);
694 __u32 flags = 0;
695
696 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
697 flags = IP6_TNL_F_CAP_PER_PACKET;
698 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
699 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
700 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
701 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
702 if (ltype&IPV6_ADDR_UNICAST)
703 flags |= IP6_TNL_F_CAP_XMIT;
704 if (rtype&IPV6_ADDR_UNICAST)
705 flags |= IP6_TNL_F_CAP_RCV;
706 }
707 return flags;
708}
709
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100710/* called with rcu_read_lock() */
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000711static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
712 const struct in6_addr *laddr,
713 const struct in6_addr *raddr)
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800714{
715 struct ip6_tnl_parm *p = &t->parms;
716 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700717 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800718
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000719 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
720 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
721 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900722 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800723
724 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100725 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800726
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000727 if ((ipv6_addr_is_multicast(laddr) ||
728 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
729 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800730 ret = 1;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800731 }
732 return ret;
733}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
735/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900736 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 * @skb: received socket buffer
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900738 * @protocol: ethernet protocol ID
739 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 *
741 * Return: 0
742 **/
743
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900744static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900745 __u8 ipproto,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000746 void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
747 const struct ipv6hdr *ipv6h,
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900748 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 struct ip6_tnl *t;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000751 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
Eric Dumazet2922bc82009-10-23 06:34:34 +0000753 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700755 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700756 &ipv6h->daddr)) != NULL) {
Eric Dumazet8560f222010-09-28 03:23:34 +0000757 struct pcpu_tstats *tstats;
758
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900759 if (t->parms.proto != ipproto && t->parms.proto != 0) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000760 rcu_read_unlock();
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900761 goto discard;
762 }
763
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000765 rcu_read_unlock();
Herbert Xu50fba2a2006-04-04 13:50:45 -0700766 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 }
768
Ville Nuorvalad0087b22012-06-28 18:15:52 +0000769 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700770 t->dev->stats.rx_dropped++;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000771 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 goto discard;
773 }
774 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700775 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700776 skb_reset_network_header(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900777 skb->protocol = htons(protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 skb->pkt_type = PACKET_HOST;
779 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700780
Eric Dumazet8560f222010-09-28 03:23:34 +0000781 tstats = this_cpu_ptr(t->dev->tstats);
782 tstats->rx_packets++;
783 tstats->rx_bytes += skb->len;
784
785 __skb_tunnel_rx(skb, t->dev);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900786
787 dscp_ecn_decapsulate(t, ipv6h, skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000788
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000789 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000790
Eric Dumazet2922bc82009-10-23 06:34:34 +0000791 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 return 0;
793 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000794 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 return 1;
Herbert Xu50fba2a2006-04-04 13:50:45 -0700796
797discard:
798 kfree_skb(skb);
799 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800}
801
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900802static int ip4ip6_rcv(struct sk_buff *skb)
803{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900804 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
805 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900806}
807
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900808static int ip6ip6_rcv(struct sk_buff *skb)
809{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900810 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
811 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900812}
813
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800814struct ipv6_tel_txoption {
815 struct ipv6_txoptions ops;
816 __u8 dst_opt[8];
817};
818
819static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800821 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800823 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
824 opt->dst_opt[3] = 1;
825 opt->dst_opt[4] = encap_limit;
826 opt->dst_opt[5] = IPV6_TLV_PADN;
827 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800829 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
830 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831}
832
833/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900834 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900836 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 *
838 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900839 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 * doesn't match source of incoming packet.
841 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900842 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 * 1 if conflict,
844 * 0 else
845 **/
846
Eric Dumazet92113bf2012-05-18 08:14:11 +0200847static inline bool
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000848ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849{
850 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
851}
852
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800853static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
854{
855 struct ip6_tnl_parm *p = &t->parms;
856 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700857 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800858
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900859 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800860 struct net_device *ldev = NULL;
861
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100862 rcu_read_lock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800863 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100864 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800865
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700866 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000867 pr_warn("%s xmit: Local address not yet configured!\n",
868 p->name);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800869 else if (!ipv6_addr_is_multicast(&p->raddr) &&
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700870 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Joe Perchesf3213832012-05-15 14:11:53 +0000871 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
872 p->name);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800873 else
874 ret = 1;
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100875 rcu_read_unlock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800876 }
877 return ret;
878}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879/**
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900880 * ip6_tnl_xmit2 - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900882 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900883 * @dsfield: dscp code for outer header
884 * @fl: flow of tunneled packet
885 * @encap_limit: encapsulation limit
886 * @pmtu: Path MTU is stored if packet is too big
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 *
888 * Description:
889 * Build new header and do some sanity checks on the packet before sending
890 * it.
891 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900892 * Return:
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900893 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900894 * -1 fail
895 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 **/
897
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900898static int ip6_tnl_xmit2(struct sk_buff *skb,
899 struct net_device *dev,
900 __u8 dsfield,
David S. Miller4c9483b2011-03-12 16:22:43 -0500901 struct flowi6 *fl6,
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900902 int encap_limit,
903 __u32 *pmtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904{
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800905 struct net *net = dev_net(dev);
Patrick McHardy2941a482006-01-08 22:05:26 -0800906 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700907 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700908 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800909 struct ipv6_tel_txoption opt;
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400910 struct dst_entry *dst = NULL, *ndst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 struct net_device *tdev;
912 int mtu;
Chuck Leverc2636b42007-10-23 21:07:32 -0700913 unsigned int max_headroom = sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 u8 proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900915 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 int pkt_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400918 if (!fl6->flowi6_mark)
919 dst = ip6_tnl_dst_check(t);
Eric Dumazet89b02122011-07-28 04:32:25 +0000920 if (!dst) {
921 ndst = ip6_route_output(net, NULL, fl6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922
Eric Dumazet89b02122011-07-28 04:32:25 +0000923 if (ndst->error)
Patrick McHardya57ebc92005-09-08 14:27:47 -0700924 goto tx_err_link_failure;
Eric Dumazet89b02122011-07-28 04:32:25 +0000925 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
926 if (IS_ERR(ndst)) {
927 err = PTR_ERR(ndst);
928 ndst = NULL;
David S. Miller452edd52011-03-02 13:27:41 -0800929 goto tx_err_link_failure;
930 }
Eric Dumazet89b02122011-07-28 04:32:25 +0000931 dst = ndst;
Patrick McHardya57ebc92005-09-08 14:27:47 -0700932 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
934 tdev = dst->dev;
935
936 if (tdev == dev) {
937 stats->collisions++;
Joe Perchese87cc472012-05-13 21:56:26 +0000938 net_warn_ratelimited("%s: Local routing loop detected!\n",
939 t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 goto tx_err_dst_release;
941 }
942 mtu = dst_mtu(dst) - sizeof (*ipv6h);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800943 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 max_headroom += 8;
945 mtu -= 8;
946 }
947 if (mtu < IPV6_MIN_MTU)
948 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +0000949 if (skb_dst(skb))
950 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 if (skb->len > mtu) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900952 *pmtu = mtu;
953 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 goto tx_err_dst_release;
955 }
956
957 /*
958 * Okay, now see if we can stuff it in the buffer as-is.
959 */
960 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900961
Patrick McHardycfbba492007-07-09 15:33:40 -0700962 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
963 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900965
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
967 goto tx_err_dst_release;
968
969 if (skb->sk)
970 skb_set_owner_w(new_skb, skb->sk);
Eric Dumazet9ff26442012-04-19 02:24:17 +0000971 consume_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 skb = new_skb;
973 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000974 skb_dst_drop(skb);
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400975 if (fl6->flowi6_mark) {
976 skb_dst_set(skb, dst);
977 ndst = NULL;
978 } else {
979 skb_dst_set_noref(skb, dst);
980 }
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700981 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
David S. Miller4c9483b2011-03-12 16:22:43 -0500983 proto = fl6->flowi6_proto;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800984 if (encap_limit >= 0) {
985 init_tel_txopt(&opt, encap_limit);
986 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
987 }
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700988 skb_push(skb, sizeof(struct ipv6hdr));
989 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700990 ipv6h = ipv6_hdr(skb);
David S. Miller4c9483b2011-03-12 16:22:43 -0500991 *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 dsfield = INET_ECN_encapsulate(0, dsfield);
993 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 ipv6h->hop_limit = t->parms.hop_limit;
995 ipv6h->nexthdr = proto;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000996 ipv6h->saddr = fl6->saddr;
997 ipv6h->daddr = fl6->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 nf_reset(skb);
999 pkt_len = skb->len;
Herbert Xuef76bc22008-01-11 19:15:08 -08001000 err = ip6_local_out(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -02001002 if (net_xmit_eval(err) == 0) {
Eric Dumazet8560f222010-09-28 03:23:34 +00001003 struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats);
1004
1005 tstats->tx_bytes += pkt_len;
1006 tstats->tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 } else {
1008 stats->tx_errors++;
1009 stats->tx_aborted_errors++;
1010 }
Eric Dumazet89b02122011-07-28 04:32:25 +00001011 if (ndst)
1012 ip6_tnl_dst_store(t, ndst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 return 0;
1014tx_err_link_failure:
1015 stats->tx_carrier_errors++;
1016 dst_link_failure(skb);
1017tx_err_dst_release:
Eric Dumazet89b02122011-07-28 04:32:25 +00001018 dst_release(ndst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001019 return err;
1020}
1021
1022static inline int
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001023ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1024{
1025 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001026 const struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001027 int encap_limit = -1;
David S. Miller4c9483b2011-03-12 16:22:43 -05001028 struct flowi6 fl6;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001029 __u8 dsfield;
1030 __u32 mtu;
1031 int err;
1032
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001033 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1034 !ip6_tnl_xmit_ctl(t))
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001035 return -1;
1036
1037 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1038 encap_limit = t->parms.encap_limit;
1039
David S. Miller4c9483b2011-03-12 16:22:43 -05001040 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1041 fl6.flowi6_proto = IPPROTO_IPIP;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001042
1043 dsfield = ipv4_get_dsfield(iph);
1044
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001045 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001046 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
Al Virob77f2fa2007-07-21 19:09:41 -07001047 & IPV6_TCLASS_MASK;
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001048 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1049 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001050
David S. Miller4c9483b2011-03-12 16:22:43 -05001051 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001052 if (err != 0) {
1053 /* XXX: send ICMP error even if DF is not set. */
1054 if (err == -EMSGSIZE)
1055 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1056 htonl(mtu));
1057 return -1;
1058 }
1059
1060 return 0;
1061}
1062
1063static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001064ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1065{
1066 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001067 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001068 int encap_limit = -1;
1069 __u16 offset;
David S. Miller4c9483b2011-03-12 16:22:43 -05001070 struct flowi6 fl6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001071 __u8 dsfield;
1072 __u32 mtu;
1073 int err;
1074
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001075 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1076 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001077 return -1;
1078
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001079 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
1080 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001081 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001082 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001083 if (tel->encap_limit == 0) {
1084 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001085 ICMPV6_HDR_FIELD, offset + 2);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001086 return -1;
1087 }
1088 encap_limit = tel->encap_limit - 1;
1089 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1090 encap_limit = t->parms.encap_limit;
1091
David S. Miller4c9483b2011-03-12 16:22:43 -05001092 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1093 fl6.flowi6_proto = IPPROTO_IPV6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001094
1095 dsfield = ipv6_get_dsfield(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001096 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001097 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001098 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
David S. Miller4c9483b2011-03-12 16:22:43 -05001099 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001100 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1101 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001102
David S. Miller4c9483b2011-03-12 16:22:43 -05001103 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001104 if (err != 0) {
1105 if (err == -EMSGSIZE)
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001106 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001107 return -1;
1108 }
1109
1110 return 0;
1111}
1112
Stephen Hemminger6fef4c02009-08-31 19:50:41 +00001113static netdev_tx_t
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001114ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1115{
1116 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001117 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001118 int ret;
1119
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001120 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001121 case htons(ETH_P_IP):
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001122 ret = ip4ip6_tnl_xmit(skb, dev);
1123 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001124 case htons(ETH_P_IPV6):
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001125 ret = ip6ip6_tnl_xmit(skb, dev);
1126 break;
1127 default:
1128 goto tx_err;
1129 }
1130
1131 if (ret < 0)
1132 goto tx_err;
1133
Patrick McHardy6ed10652009-06-23 06:03:08 +00001134 return NETDEV_TX_OK;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001135
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136tx_err:
1137 stats->tx_errors++;
1138 stats->tx_dropped++;
1139 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +00001140 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141}
1142
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001143static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144{
1145 struct net_device *dev = t->dev;
1146 struct ip6_tnl_parm *p = &t->parms;
David S. Miller4c9483b2011-03-12 16:22:43 -05001147 struct flowi6 *fl6 = &t->fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148
Jiri Pirko3a6d54c2009-05-11 23:37:15 +00001149 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1150 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
1152 /* Set up flowi template */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001153 fl6->saddr = p->laddr;
1154 fl6->daddr = p->raddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001155 fl6->flowi6_oif = p->link;
1156 fl6->flowlabel = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
1158 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001159 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001161 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001163 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1164 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165
1166 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1167 dev->flags |= IFF_POINTOPOINT;
1168 else
1169 dev->flags &= ~IFF_POINTOPOINT;
1170
1171 dev->iflink = p->link;
1172
1173 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001174 int strict = (ipv6_addr_type(&p->raddr) &
1175 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1176
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001177 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1178 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001179 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
1181 if (rt == NULL)
1182 return;
1183
David S. Millerd1918542011-12-28 20:19:20 -05001184 if (rt->dst.dev) {
1185 dev->hard_header_len = rt->dst.dev->hard_header_len +
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 sizeof (struct ipv6hdr);
1187
David S. Millerd1918542011-12-28 20:19:20 -05001188 dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001189 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1190 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
1192 if (dev->mtu < IPV6_MIN_MTU)
1193 dev->mtu = IPV6_MIN_MTU;
1194 }
Changli Gaod8d1f302010-06-10 23:31:35 -07001195 dst_release(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 }
1197}
1198
1199/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001200 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 * @t: tunnel to be changed
1202 * @p: tunnel configuration parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 *
1204 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001205 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 **/
1207
1208static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001209ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210{
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001211 t->parms.laddr = p->laddr;
1212 t->parms.raddr = p->raddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 t->parms.flags = p->flags;
1214 t->parms.hop_limit = p->hop_limit;
1215 t->parms.encap_limit = p->encap_limit;
1216 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001217 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001218 t->parms.proto = p->proto;
Hugo Santos0c088892006-02-24 13:16:25 -08001219 ip6_tnl_dst_reset(t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001220 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 return 0;
1222}
1223
1224/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001225 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 * @dev: virtual device associated with tunnel
1227 * @ifr: parameters passed from userspace
1228 * @cmd: command to be performed
1229 *
1230 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001231 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001232 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 *
1234 * The possible commands are the following:
1235 * %SIOCGETTUNNEL: get tunnel parameters for device
1236 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1237 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1238 * %SIOCDELTUNNEL: delete tunnel
1239 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001240 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 * initialization, can be used for creating other tunnel devices.
1242 *
1243 * Return:
1244 * 0 on success,
1245 * %-EFAULT if unable to copy data to or from userspace,
1246 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1247 * %-EINVAL if passed tunnel parameters are invalid,
1248 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1249 * %-ENODEV if attempting to change or delete a nonexisting device
1250 **/
1251
1252static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001253ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254{
1255 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 struct ip6_tnl_parm p;
1257 struct ip6_tnl *t = NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001258 struct net *net = dev_net(dev);
1259 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260
1261 switch (cmd) {
1262 case SIOCGETTUNNEL:
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001263 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001264 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 err = -EFAULT;
1266 break;
1267 }
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001268 t = ip6_tnl_locate(net, &p, 0);
Ville Nuorvala567131a2006-11-24 17:05:41 -08001269 }
1270 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -08001271 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 memcpy(&p, &t->parms, sizeof (p));
1273 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1274 err = -EFAULT;
1275 }
1276 break;
1277 case SIOCADDTUNNEL:
1278 case SIOCCHGTUNNEL:
1279 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 if (!capable(CAP_NET_ADMIN))
1281 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001282 err = -EFAULT;
1283 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001285 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001286 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1287 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 break;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001289 t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001290 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001291 if (t != NULL) {
1292 if (t->dev != dev) {
1293 err = -EEXIST;
1294 break;
1295 }
1296 } else
1297 t = netdev_priv(dev);
1298
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001299 ip6_tnl_unlink(ip6n, t);
Pavel Emelyanov74b0b852010-10-27 05:43:53 +00001300 synchronize_net();
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001301 err = ip6_tnl_change(t, &p);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001302 ip6_tnl_link(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 netdev_state_change(dev);
1304 }
Ville Nuorvala567131a2006-11-24 17:05:41 -08001305 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 err = 0;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001307 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
1308 err = -EFAULT;
1309
1310 } else
1311 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 break;
1313 case SIOCDELTUNNEL:
1314 err = -EPERM;
1315 if (!capable(CAP_NET_ADMIN))
1316 break;
1317
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001318 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001319 err = -EFAULT;
1320 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001322 err = -ENOENT;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001323 if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001325 err = -EPERM;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001326 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001328 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001330 err = 0;
1331 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 break;
1333 default:
1334 err = -EINVAL;
1335 }
1336 return err;
1337}
1338
1339/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001340 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 * @dev: virtual device associated with tunnel
1342 * @new_mtu: the new mtu
1343 *
1344 * Return:
1345 * 0 on success,
1346 * %-EINVAL if mtu too small
1347 **/
1348
1349static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001350ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351{
1352 if (new_mtu < IPV6_MIN_MTU) {
1353 return -EINVAL;
1354 }
1355 dev->mtu = new_mtu;
1356 return 0;
1357}
1358
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001359
1360static const struct net_device_ops ip6_tnl_netdev_ops = {
Eric Dumazet8560f222010-09-28 03:23:34 +00001361 .ndo_uninit = ip6_tnl_dev_uninit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001362 .ndo_start_xmit = ip6_tnl_xmit,
Eric Dumazet8560f222010-09-28 03:23:34 +00001363 .ndo_do_ioctl = ip6_tnl_ioctl,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001364 .ndo_change_mtu = ip6_tnl_change_mtu,
Eric Dumazet8560f222010-09-28 03:23:34 +00001365 .ndo_get_stats = ip6_get_stats,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001366};
1367
Eric Dumazet8560f222010-09-28 03:23:34 +00001368
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001370 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 * @dev: virtual device associated with tunnel
1372 *
1373 * Description:
1374 * Initialize function pointers and device parameters
1375 **/
1376
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001377static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378{
Anders Franzen381601e2010-11-24 05:47:18 +00001379 struct ip6_tnl *t;
1380
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001381 dev->netdev_ops = &ip6_tnl_netdev_ops;
Eric Dumazet8560f222010-09-28 03:23:34 +00001382 dev->destructor = ip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383
1384 dev->type = ARPHRD_TUNNEL6;
1385 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1386 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001387 t = netdev_priv(dev);
1388 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1389 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 dev->flags |= IFF_NOARP;
1391 dev->addr_len = sizeof(struct in6_addr);
Pavel Emelyanov554eb272008-04-16 01:24:13 -07001392 dev->features |= NETIF_F_NETNS_LOCAL;
Anders Franzen7e223de2010-10-19 03:50:47 +00001393 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394}
1395
1396
1397/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001398 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 * @dev: virtual device associated with tunnel
1400 **/
1401
Eric Dumazet8560f222010-09-28 03:23:34 +00001402static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001403ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404{
Patrick McHardy2941a482006-01-08 22:05:26 -08001405 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001406
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 t->dev = dev;
Eric Dumazet8560f222010-09-28 03:23:34 +00001408 dev->tstats = alloc_percpu(struct pcpu_tstats);
1409 if (!dev->tstats)
1410 return -ENOMEM;
1411 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412}
1413
1414/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001415 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 * @dev: virtual device associated with tunnel
1417 **/
1418
Eric Dumazet8560f222010-09-28 03:23:34 +00001419static int ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420{
Patrick McHardy2941a482006-01-08 22:05:26 -08001421 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001422 int err = ip6_tnl_dev_init_gen(dev);
1423
1424 if (err)
1425 return err;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001426 ip6_tnl_link_config(t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001427 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428}
1429
1430/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001431 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 * @dev: fallback device
1433 *
1434 * Return: 0
1435 **/
1436
Eric Dumazet8560f222010-09-28 03:23:34 +00001437static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438{
Patrick McHardy2941a482006-01-08 22:05:26 -08001439 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001440 struct net *net = dev_net(dev);
1441 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Eric Dumazet8560f222010-09-28 03:23:34 +00001442 int err = ip6_tnl_dev_init_gen(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001443
Eric Dumazet8560f222010-09-28 03:23:34 +00001444 if (err)
1445 return err;
1446
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001447 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 dev_hold(dev);
Ville Nuorvalad0087b22012-06-28 18:15:52 +00001449
1450 ip6_tnl_link_config(t);
1451
Eric Dumazetcf778b02012-01-12 04:41:32 +00001452 rcu_assign_pointer(ip6n->tnls_wc[0], t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001453 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454}
1455
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001456static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001457 .handler = ip4ip6_rcv,
1458 .err_handler = ip4ip6_err,
1459 .priority = 1,
1460};
1461
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001462static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
Patrick McHardy03037702005-07-19 14:03:34 -07001463 .handler = ip6ip6_rcv,
1464 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08001465 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466};
1467
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001468static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001469{
1470 int h;
1471 struct ip6_tnl *t;
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001472 LIST_HEAD(list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001473
1474 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet94767632010-09-15 20:25:34 +00001475 t = rtnl_dereference(ip6n->tnls_r_l[h]);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001476 while (t != NULL) {
1477 unregister_netdevice_queue(t->dev, &list);
Eric Dumazet94767632010-09-15 20:25:34 +00001478 t = rtnl_dereference(t->next);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001479 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001480 }
1481
Eric Dumazet94767632010-09-15 20:25:34 +00001482 t = rtnl_dereference(ip6n->tnls_wc[0]);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001483 unregister_netdevice_queue(t->dev, &list);
1484 unregister_netdevice_many(&list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001485}
1486
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001487static int __net_init ip6_tnl_init_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001488{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001489 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Josh Boyer731abb92011-11-10 15:10:23 +00001490 struct ip6_tnl *t = NULL;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001491 int err;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001492
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001493 ip6n->tnls[0] = ip6n->tnls_wc;
1494 ip6n->tnls[1] = ip6n->tnls_r_l;
1495
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001496 err = -ENOMEM;
1497 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1498 ip6_tnl_dev_setup);
1499
1500 if (!ip6n->fb_tnl_dev)
1501 goto err_alloc_dev;
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001502 dev_net_set(ip6n->fb_tnl_dev, net);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001503
Eric Dumazet8560f222010-09-28 03:23:34 +00001504 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1505 if (err < 0)
1506 goto err_register;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001507
1508 err = register_netdev(ip6n->fb_tnl_dev);
1509 if (err < 0)
1510 goto err_register;
Josh Boyer731abb92011-11-10 15:10:23 +00001511
1512 t = netdev_priv(ip6n->fb_tnl_dev);
1513
1514 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001515 return 0;
1516
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001517err_register:
Eric Dumazet8560f222010-09-28 03:23:34 +00001518 ip6_dev_free(ip6n->fb_tnl_dev);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001519err_alloc_dev:
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001520 return err;
1521}
1522
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001523static void __net_exit ip6_tnl_exit_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001524{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001525 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001526
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001527 rtnl_lock();
1528 ip6_tnl_destroy_tunnels(ip6n);
1529 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001530}
1531
1532static struct pernet_operations ip6_tnl_net_ops = {
1533 .init = ip6_tnl_init_net,
1534 .exit = ip6_tnl_exit_net,
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001535 .id = &ip6_tnl_net_id,
1536 .size = sizeof(struct ip6_tnl_net),
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001537};
1538
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539/**
1540 * ip6_tunnel_init - register protocol and reserve needed resources
1541 *
1542 * Return: 0 on success
1543 **/
1544
1545static int __init ip6_tunnel_init(void)
1546{
1547 int err;
1548
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001549 err = register_pernet_device(&ip6_tnl_net_ops);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001550 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001551 goto out_pernet;
1552
1553 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1554 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00001555 pr_err("%s: can't register ip4ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001556 goto out_ip4ip6;
1557 }
1558
1559 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1560 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00001561 pr_err("%s: can't register ip6ip6\n", __func__);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001562 goto out_ip6ip6;
1563 }
1564
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 return 0;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001566
1567out_ip6ip6:
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001568 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001569out_ip4ip6:
1570 unregister_pernet_device(&ip6_tnl_net_ops);
1571out_pernet:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 return err;
1573}
1574
1575/**
1576 * ip6_tunnel_cleanup - free resources and unregister protocol
1577 **/
1578
1579static void __exit ip6_tunnel_cleanup(void)
1580{
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001581 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Joe Perchesf3213832012-05-15 14:11:53 +00001582 pr_info("%s: can't deregister ip4ip6\n", __func__);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001583
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001584 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Joe Perchesf3213832012-05-15 14:11:53 +00001585 pr_info("%s: can't deregister ip6ip6\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001587 unregister_pernet_device(&ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588}
1589
1590module_init(ip6_tunnel_init);
1591module_exit(ip6_tunnel_cleanup);