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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09002 * IPv6 tunneling device
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Linux INET6 implementation
4 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Ville Nuorvala <vnuorval@tcs.hut.fi>
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09007 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Based on:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090010 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 * RFC 2473
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/module.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080022#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/sockios.h>
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090026#include <linux/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/if.h>
28#include <linux/in.h>
29#include <linux/ip.h>
30#include <linux/if_tunnel.h>
31#include <linux/net.h>
32#include <linux/in6.h>
33#include <linux/netdevice.h>
34#include <linux/if_arp.h>
35#include <linux/icmpv6.h>
36#include <linux/init.h>
37#include <linux/route.h>
38#include <linux/rtnetlink.h>
39#include <linux/netfilter_ipv6.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42#include <asm/uaccess.h>
43#include <asm/atomic.h>
44
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090045#include <net/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <net/ip.h>
47#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <net/ip6_route.h>
49#include <net/addrconf.h>
50#include <net/ip6_tunnel.h>
51#include <net/xfrm.h>
52#include <net/dsfield.h>
53#include <net/inet_ecn.h>
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070054#include <net/net_namespace.h>
55#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57MODULE_AUTHOR("Ville Nuorvala");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090058MODULE_DESCRIPTION("IPv6 tunneling device");
Linus Torvalds1da177e2005-04-16 15:20:36 -070059MODULE_LICENSE("GPL");
stephen hemminger6dfbd872011-03-10 11:43:19 +000060MODULE_ALIAS_NETDEV("ip6tnl0");
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#ifdef IP6_TNL_DEBUG
Harvey Harrison0dc47872008-03-05 20:47:47 -080063#define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#else
65#define IP6_TNL_TRACE(x...) do {;} while(0)
66#endif
67
68#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090069#define IPV6_TCLASS_SHIFT 20
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71#define HASH_SIZE 32
72
Al Viroe69a4adc2006-11-14 20:56:00 -080073#define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090074 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
75 (HASH_SIZE - 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Eric Dumazet8560f222010-09-28 03:23:34 +000077static int ip6_tnl_dev_init(struct net_device *dev);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +090078static void ip6_tnl_dev_setup(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Eric Dumazetf99189b2009-11-17 10:42:49 +000080static int ip6_tnl_net_id __read_mostly;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070081struct ip6_tnl_net {
Pavel Emelyanov15820e1292008-04-16 01:23:02 -070082 /* the IPv6 tunnel fallback device */
83 struct net_device *fb_tnl_dev;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -070084 /* lists for storing tunnels in use */
Eric Dumazet94767632010-09-15 20:25:34 +000085 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
86 struct ip6_tnl __rcu *tnls_wc[1];
87 struct ip6_tnl __rcu **tnls[2];
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070088};
89
Eric Dumazet8560f222010-09-28 03:23:34 +000090/* often modified stats are per cpu, other are shared (netdev->stats) */
91struct pcpu_tstats {
92 unsigned long rx_packets;
93 unsigned long rx_bytes;
94 unsigned long tx_packets;
95 unsigned long tx_bytes;
96};
97
98static struct net_device_stats *ip6_get_stats(struct net_device *dev)
99{
100 struct pcpu_tstats sum = { 0 };
101 int i;
102
103 for_each_possible_cpu(i) {
104 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
105
106 sum.rx_packets += tstats->rx_packets;
107 sum.rx_bytes += tstats->rx_bytes;
108 sum.tx_packets += tstats->tx_packets;
109 sum.tx_bytes += tstats->tx_bytes;
110 }
111 dev->stats.rx_packets = sum.rx_packets;
112 dev->stats.rx_bytes = sum.rx_bytes;
113 dev->stats.tx_packets = sum.tx_packets;
114 dev->stats.tx_bytes = sum.tx_bytes;
115 return &dev->stats;
116}
117
Eric Dumazet2922bc82009-10-23 06:34:34 +0000118/*
Eric Dumazet94767632010-09-15 20:25:34 +0000119 * Locking : hash tables are protected by RCU and RTNL
Eric Dumazet2922bc82009-10-23 06:34:34 +0000120 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
123{
124 struct dst_entry *dst = t->dst_cache;
125
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900126 if (dst && dst->obsolete &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 dst->ops->check(dst, t->dst_cookie) == NULL) {
128 t->dst_cache = NULL;
129 dst_release(dst);
130 return NULL;
131 }
132
133 return dst;
134}
135
136static inline void ip6_tnl_dst_reset(struct ip6_tnl *t)
137{
138 dst_release(t->dst_cache);
139 t->dst_cache = NULL;
140}
141
142static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
143{
144 struct rt6_info *rt = (struct rt6_info *) dst;
145 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
146 dst_release(t->dst_cache);
147 t->dst_cache = dst;
148}
149
150/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900151 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900152 * @remote: the address of the tunnel exit-point
153 * @local: the address of the tunnel entry-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900155 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 * tunnel matching given end-points if found,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900157 * else fallback tunnel if its device is up,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 * else %NULL
159 **/
160
Eric Dumazet2922bc82009-10-23 06:34:34 +0000161#define for_each_ip6_tunnel_rcu(start) \
162 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164static struct ip6_tnl *
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700165ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
Eric Dumazet94767632010-09-15 20:25:34 +0000167 unsigned int h0 = HASH(remote);
168 unsigned int h1 = HASH(local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 struct ip6_tnl *t;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700170 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Eric Dumazet2922bc82009-10-23 06:34:34 +0000172 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (ipv6_addr_equal(local, &t->parms.laddr) &&
174 ipv6_addr_equal(remote, &t->parms.raddr) &&
175 (t->dev->flags & IFF_UP))
176 return t;
177 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000178 t = rcu_dereference(ip6n->tnls_wc[0]);
179 if (t && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 return t;
181
182 return NULL;
183}
184
185/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900186 * ip6_tnl_bucket - get head of list matching given tunnel parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900187 * @p: parameters containing tunnel end-points
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 *
189 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900190 * ip6_tnl_bucket() returns the head of the list matching the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 * &struct in6_addr entries laddr and raddr in @p.
192 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900193 * Return: head of IPv6 tunnel list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 **/
195
Eric Dumazet94767632010-09-15 20:25:34 +0000196static struct ip6_tnl __rcu **
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700197ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
199 struct in6_addr *remote = &p->raddr;
200 struct in6_addr *local = &p->laddr;
201 unsigned h = 0;
202 int prio = 0;
203
204 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
205 prio = 1;
206 h = HASH(remote) ^ HASH(local);
207 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700208 return &ip6n->tnls[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209}
210
211/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900212 * ip6_tnl_link - add tunnel to hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 * @t: tunnel to be added
214 **/
215
216static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700217ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
Eric Dumazet94767632010-09-15 20:25:34 +0000219 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Eric Dumazet94767632010-09-15 20:25:34 +0000221 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
Eric Dumazet2922bc82009-10-23 06:34:34 +0000222 rcu_assign_pointer(*tp, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
224
225/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900226 * ip6_tnl_unlink - remove tunnel from hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 * @t: tunnel to be removed
228 **/
229
230static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700231ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
Eric Dumazet94767632010-09-15 20:25:34 +0000233 struct ip6_tnl __rcu **tp;
234 struct ip6_tnl *iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Eric Dumazet94767632010-09-15 20:25:34 +0000236 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
237 (iter = rtnl_dereference(*tp)) != NULL;
238 tp = &iter->next) {
239 if (t == iter) {
240 rcu_assign_pointer(*tp, t->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 break;
242 }
243 }
244}
245
Eric Dumazet8560f222010-09-28 03:23:34 +0000246static void ip6_dev_free(struct net_device *dev)
247{
248 free_percpu(dev->tstats);
249 free_netdev(dev);
250}
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252/**
253 * ip6_tnl_create() - create a new tunnel
254 * @p: tunnel parameters
255 * @pt: pointer to new tunnel
256 *
257 * Description:
258 * Create tunnel matching given parameters.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900259 *
260 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800261 * created tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 **/
263
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700264static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265{
266 struct net_device *dev;
267 struct ip6_tnl *t;
268 char name[IFNAMSIZ];
269 int err;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700270 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800272 if (p->name[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 strlcpy(name, p->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800274 else
275 sprintf(name, "ip6tnl%%d");
276
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900277 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 if (dev == NULL)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800279 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Pavel Emelyanov554eb272008-04-16 01:24:13 -0700281 dev_net_set(dev, net);
282
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800283 if (strchr(name, '%')) {
284 if (dev_alloc_name(dev, name) < 0)
285 goto failed_free;
286 }
287
Patrick McHardy2941a482006-01-08 22:05:26 -0800288 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 t->parms = *p;
Eric Dumazet8560f222010-09-28 03:23:34 +0000290 err = ip6_tnl_dev_init(dev);
291 if (err < 0)
292 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800294 if ((err = register_netdevice(dev)) < 0)
295 goto failed_free;
296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 dev_hold(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700298 ip6_tnl_link(ip6n, t);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800299 return t;
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800300
301failed_free:
Eric Dumazet8560f222010-09-28 03:23:34 +0000302 ip6_dev_free(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800303failed:
304 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305}
306
307/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900308 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900309 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 * @create: != 0 if allowed to create new tunnel if no match found
311 *
312 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900313 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 * based on @parms. If this is unsuccessful, but @create is set a new
315 * tunnel device is created and registered for use.
316 *
317 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800318 * matching tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 **/
320
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700321static struct ip6_tnl *ip6_tnl_locate(struct net *net,
322 struct ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323{
324 struct in6_addr *remote = &p->raddr;
325 struct in6_addr *local = &p->laddr;
Eric Dumazet94767632010-09-15 20:25:34 +0000326 struct ip6_tnl __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700328 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Eric Dumazet94767632010-09-15 20:25:34 +0000330 for (tp = ip6_tnl_bucket(ip6n, p);
331 (t = rtnl_dereference(*tp)) != NULL;
332 tp = &t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Ville Nuorvala567131a2006-11-24 17:05:41 -0800334 ipv6_addr_equal(remote, &t->parms.raddr))
335 return t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 }
337 if (!create)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800338 return NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700339 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340}
341
342/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900343 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900345 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900347 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 **/
349
350static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900351ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
Patrick McHardy2941a482006-01-08 22:05:26 -0800353 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700354 struct net *net = dev_net(dev);
355 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
Eric Dumazet94767632010-09-15 20:25:34 +0000357 if (dev == ip6n->fb_tnl_dev)
358 rcu_assign_pointer(ip6n->tnls_wc[0], NULL);
359 else
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700360 ip6_tnl_unlink(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 ip6_tnl_dst_reset(t);
362 dev_put(dev);
363}
364
365/**
366 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
367 * @skb: received socket buffer
368 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900369 * Return:
370 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 * else index to encapsulation limit
372 **/
373
374static __u16
375parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
376{
377 struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw;
378 __u8 nexthdr = ipv6h->nexthdr;
379 __u16 off = sizeof (*ipv6h);
380
381 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
382 __u16 optlen = 0;
383 struct ipv6_opt_hdr *hdr;
384 if (raw + off + sizeof (*hdr) > skb->data &&
385 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
386 break;
387
388 hdr = (struct ipv6_opt_hdr *) (raw + off);
389 if (nexthdr == NEXTHDR_FRAGMENT) {
390 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
391 if (frag_hdr->frag_off)
392 break;
393 optlen = 8;
394 } else if (nexthdr == NEXTHDR_AUTH) {
395 optlen = (hdr->hdrlen + 2) << 2;
396 } else {
397 optlen = ipv6_optlen(hdr);
398 }
399 if (nexthdr == NEXTHDR_DEST) {
400 __u16 i = off + 2;
401 while (1) {
402 struct ipv6_tlv_tnl_enc_lim *tel;
403
404 /* No more room for encapsulation limit */
405 if (i + sizeof (*tel) > off + optlen)
406 break;
407
408 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
409 /* return index of option if found and valid */
410 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
411 tel->length == 1)
412 return i;
413 /* else jump to next option */
414 if (tel->type)
415 i += tel->length + 2;
416 else
417 i++;
418 }
419 }
420 nexthdr = hdr->nexthdr;
421 off += optlen;
422 }
423 return 0;
424}
425
426/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900427 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 *
429 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900430 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 * to the specifications in RFC 2473.
432 **/
433
Herbert Xud2acc342006-03-28 01:12:13 -0800434static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900435ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700436 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437{
438 struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data;
439 struct ip6_tnl *t;
440 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700441 u8 rel_type = ICMPV6_DEST_UNREACH;
442 u8 rel_code = ICMPV6_ADDR_UNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 __u32 rel_info = 0;
444 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800445 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900447 /* If the packet doesn't contain the original IPv6 header we are
448 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 processing of the error. */
450
Eric Dumazet2922bc82009-10-23 06:34:34 +0000451 rcu_read_lock();
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700452 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700453 &ipv6h->saddr)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 goto out;
455
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900456 if (t->parms.proto != ipproto && t->parms.proto != 0)
457 goto out;
458
Herbert Xud2acc342006-03-28 01:12:13 -0800459 err = 0;
460
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900461 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 __u32 teli;
463 struct ipv6_tlv_tnl_enc_lim *tel;
464 __u32 mtu;
465 case ICMPV6_DEST_UNREACH:
466 if (net_ratelimit())
467 printk(KERN_WARNING
468 "%s: Path to destination invalid "
469 "or inactive!\n", t->parms.name);
470 rel_msg = 1;
471 break;
472 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900473 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 if (net_ratelimit())
475 printk(KERN_WARNING
476 "%s: Too small hop limit or "
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900477 "routing loop in tunnel!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 t->parms.name);
479 rel_msg = 1;
480 }
481 break;
482 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800483 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900484 if ((*code) == ICMPV6_HDR_FIELD)
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800485 teli = parse_tlv_tnl_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
Al Viro704eae12007-07-26 17:33:29 +0100487 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
489 if (tel->encap_limit == 0) {
490 if (net_ratelimit())
491 printk(KERN_WARNING
492 "%s: Too small encapsulation "
493 "limit or routing loop in "
494 "tunnel!\n", t->parms.name);
495 rel_msg = 1;
496 }
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800497 } else if (net_ratelimit()) {
498 printk(KERN_WARNING
499 "%s: Recipient unable to parse tunneled "
500 "packet!\n ", t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 }
502 break;
503 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100504 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 if (mtu < IPV6_MIN_MTU)
506 mtu = IPV6_MIN_MTU;
507 t->dev->mtu = mtu;
508
Al Virocc6cdac2006-02-18 16:02:18 -0500509 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 rel_type = ICMPV6_PKT_TOOBIG;
511 rel_code = 0;
512 rel_info = mtu;
513 rel_msg = 1;
514 }
515 break;
516 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900517
518 *type = rel_type;
519 *code = rel_code;
520 *info = rel_info;
521 *msg = rel_msg;
522
523out:
Eric Dumazet2922bc82009-10-23 06:34:34 +0000524 rcu_read_unlock();
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900525 return err;
526}
527
528static int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900529ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700530 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900531{
532 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700533 u8 rel_type = type;
534 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100535 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900536 int err;
537 struct sk_buff *skb2;
538 struct iphdr *eiph;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900539 struct rtable *rt;
540
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900541 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
542 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900543 if (err < 0)
544 return err;
545
546 if (rel_msg == 0)
547 return 0;
548
549 switch (rel_type) {
550 case ICMPV6_DEST_UNREACH:
551 if (rel_code != ICMPV6_ADDR_UNREACH)
552 return 0;
553 rel_type = ICMP_DEST_UNREACH;
554 rel_code = ICMP_HOST_UNREACH;
555 break;
556 case ICMPV6_PKT_TOOBIG:
557 if (rel_code != 0)
558 return 0;
559 rel_type = ICMP_DEST_UNREACH;
560 rel_code = ICMP_FRAG_NEEDED;
561 break;
562 default:
563 return 0;
564 }
565
566 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
567 return 0;
568
569 skb2 = skb_clone(skb, GFP_ATOMIC);
570 if (!skb2)
571 return 0;
572
Eric Dumazetadf30902009-06-02 05:19:30 +0000573 skb_dst_drop(skb2);
574
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900575 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700576 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700577 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900578
579 /* Try to guess incoming interface */
David S. Miller78fbfd82011-03-12 00:00:52 -0500580 rt = ip_route_output_ports(dev_net(skb->dev), NULL,
581 eiph->saddr, 0,
582 0, 0,
583 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800584 if (IS_ERR(rt))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900585 goto out;
586
Changli Gaod8d1f302010-06-10 23:31:35 -0700587 skb2->dev = rt->dst.dev;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900588
589 /* route "incoming" packet */
590 if (rt->rt_flags & RTCF_LOCAL) {
591 ip_rt_put(rt);
592 rt = NULL;
David S. Miller78fbfd82011-03-12 00:00:52 -0500593 rt = ip_route_output_ports(dev_net(skb->dev), NULL,
594 eiph->daddr, eiph->saddr,
595 0, 0,
596 IPPROTO_IPIP,
597 RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800598 if (IS_ERR(rt) ||
Changli Gaod8d1f302010-06-10 23:31:35 -0700599 rt->dst.dev->type != ARPHRD_TUNNEL) {
David S. Millerb23dd4f2011-03-02 14:31:35 -0800600 if (!IS_ERR(rt))
601 ip_rt_put(rt);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900602 goto out;
603 }
David S. Millerb23dd4f2011-03-02 14:31:35 -0800604 skb_dst_set(skb2, &rt->dst);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900605 } else {
606 ip_rt_put(rt);
607 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
608 skb2->dev) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000609 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900610 goto out;
611 }
612
613 /* change mtu on this route */
614 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000615 if (rel_info > dst_mtu(skb_dst(skb2)))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900616 goto out;
617
Eric Dumazetadf30902009-06-02 05:19:30 +0000618 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900619 }
620
Al Viro704eae12007-07-26 17:33:29 +0100621 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900622
623out:
624 kfree_skb(skb2);
625 return 0;
626}
627
628static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900629ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700630 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900631{
632 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700633 u8 rel_type = type;
634 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100635 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900636 int err;
637
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900638 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
639 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900640 if (err < 0)
641 return err;
642
643 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 struct rt6_info *rt;
645 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800646
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900648 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
Eric Dumazetadf30902009-06-02 05:19:30 +0000650 skb_dst_drop(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700652 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653
654 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700655 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
656 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
658 if (rt && rt->rt6i_dev)
659 skb2->dev = rt->rt6i_dev;
660
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000661 icmpv6_send(skb2, rel_type, rel_code, rel_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
663 if (rt)
Changli Gaod8d1f302010-06-10 23:31:35 -0700664 dst_release(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
666 kfree_skb(skb2);
667 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900668
669 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670}
671
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900672static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
673 struct ipv6hdr *ipv6h,
674 struct sk_buff *skb)
675{
676 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
677
678 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700679 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900680
681 if (INET_ECN_is_ce(dsfield))
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700682 IP_ECN_set_ce(ip_hdr(skb));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900683}
684
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900685static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
686 struct ipv6hdr *ipv6h,
687 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900689 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b42007-11-13 21:40:13 -0800690 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900692 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700693 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900695
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100696/* called with rcu_read_lock() */
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800697static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
698{
699 struct ip6_tnl_parm *p = &t->parms;
700 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700701 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800702
703 if (p->flags & IP6_TNL_F_CAP_RCV) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900704 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800705
706 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100707 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800708
709 if ((ipv6_addr_is_multicast(&p->laddr) ||
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700710 likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
711 likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800712 ret = 1;
713
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800714 }
715 return ret;
716}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900719 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 * @skb: received socket buffer
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900721 * @protocol: ethernet protocol ID
722 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 *
724 * Return: 0
725 **/
726
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900727static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900728 __u8 ipproto,
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900729 void (*dscp_ecn_decapsulate)(struct ip6_tnl *t,
730 struct ipv6hdr *ipv6h,
731 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 struct ip6_tnl *t;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700734 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
Eric Dumazet2922bc82009-10-23 06:34:34 +0000736 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700738 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700739 &ipv6h->daddr)) != NULL) {
Eric Dumazet8560f222010-09-28 03:23:34 +0000740 struct pcpu_tstats *tstats;
741
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900742 if (t->parms.proto != ipproto && t->parms.proto != 0) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000743 rcu_read_unlock();
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900744 goto discard;
745 }
746
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000748 rcu_read_unlock();
Herbert Xu50fba2a2006-04-04 13:50:45 -0700749 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 }
751
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800752 if (!ip6_tnl_rcv_ctl(t)) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700753 t->dev->stats.rx_dropped++;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000754 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 goto discard;
756 }
757 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700758 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700759 skb_reset_network_header(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900760 skb->protocol = htons(protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 skb->pkt_type = PACKET_HOST;
762 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700763
Eric Dumazet8560f222010-09-28 03:23:34 +0000764 tstats = this_cpu_ptr(t->dev->tstats);
765 tstats->rx_packets++;
766 tstats->rx_bytes += skb->len;
767
768 __skb_tunnel_rx(skb, t->dev);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900769
770 dscp_ecn_decapsulate(t, ipv6h, skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000771
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000772 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000773
Eric Dumazet2922bc82009-10-23 06:34:34 +0000774 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 return 0;
776 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000777 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 return 1;
Herbert Xu50fba2a2006-04-04 13:50:45 -0700779
780discard:
781 kfree_skb(skb);
782 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783}
784
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900785static int ip4ip6_rcv(struct sk_buff *skb)
786{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900787 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
788 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900789}
790
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900791static int ip6ip6_rcv(struct sk_buff *skb)
792{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900793 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
794 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900795}
796
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800797struct ipv6_tel_txoption {
798 struct ipv6_txoptions ops;
799 __u8 dst_opt[8];
800};
801
802static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800804 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800806 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
807 opt->dst_opt[3] = 1;
808 opt->dst_opt[4] = encap_limit;
809 opt->dst_opt[5] = IPV6_TLV_PADN;
810 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800812 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
813 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814}
815
816/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900817 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900819 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 *
821 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900822 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 * doesn't match source of incoming packet.
824 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900825 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 * 1 if conflict,
827 * 0 else
828 **/
829
830static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900831ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832{
833 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
834}
835
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800836static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
837{
838 struct ip6_tnl_parm *p = &t->parms;
839 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700840 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800841
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900842 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800843 struct net_device *ldev = NULL;
844
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100845 rcu_read_lock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800846 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100847 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800848
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700849 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800850 printk(KERN_WARNING
851 "%s xmit: Local address not yet configured!\n",
852 p->name);
853 else if (!ipv6_addr_is_multicast(&p->raddr) &&
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700854 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800855 printk(KERN_WARNING
856 "%s xmit: Routing loop! "
857 "Remote address found on this node!\n",
858 p->name);
859 else
860 ret = 1;
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100861 rcu_read_unlock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800862 }
863 return ret;
864}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865/**
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900866 * ip6_tnl_xmit2 - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900868 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900869 * @dsfield: dscp code for outer header
870 * @fl: flow of tunneled packet
871 * @encap_limit: encapsulation limit
872 * @pmtu: Path MTU is stored if packet is too big
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 *
874 * Description:
875 * Build new header and do some sanity checks on the packet before sending
876 * it.
877 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900878 * Return:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900879 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900880 * -1 fail
881 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 **/
883
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900884static int ip6_tnl_xmit2(struct sk_buff *skb,
885 struct net_device *dev,
886 __u8 dsfield,
David S. Miller4c9483b2011-03-12 16:22:43 -0500887 struct flowi6 *fl6,
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900888 int encap_limit,
889 __u32 *pmtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890{
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800891 struct net *net = dev_net(dev);
Patrick McHardy2941a482006-01-08 22:05:26 -0800892 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700893 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700894 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800895 struct ipv6_tel_txoption opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 struct dst_entry *dst;
897 struct net_device *tdev;
898 int mtu;
Chuck Leverc2636b42007-10-23 21:07:32 -0700899 unsigned int max_headroom = sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 u8 proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900901 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 int pkt_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 if ((dst = ip6_tnl_dst_check(t)) != NULL)
905 dst_hold(dst);
Patrick McHardya57ebc92005-09-08 14:27:47 -0700906 else {
David S. Miller4c9483b2011-03-12 16:22:43 -0500907 dst = ip6_route_output(net, NULL, fl6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
David S. Miller452edd52011-03-02 13:27:41 -0800909 if (dst->error)
Patrick McHardya57ebc92005-09-08 14:27:47 -0700910 goto tx_err_link_failure;
David S. Miller4c9483b2011-03-12 16:22:43 -0500911 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
David S. Miller452edd52011-03-02 13:27:41 -0800912 if (IS_ERR(dst)) {
913 err = PTR_ERR(dst);
914 dst = NULL;
915 goto tx_err_link_failure;
916 }
Patrick McHardya57ebc92005-09-08 14:27:47 -0700917 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
919 tdev = dst->dev;
920
921 if (tdev == dev) {
922 stats->collisions++;
923 if (net_ratelimit())
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900924 printk(KERN_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 "%s: Local routing loop detected!\n",
926 t->parms.name);
927 goto tx_err_dst_release;
928 }
929 mtu = dst_mtu(dst) - sizeof (*ipv6h);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800930 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 max_headroom += 8;
932 mtu -= 8;
933 }
934 if (mtu < IPV6_MIN_MTU)
935 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +0000936 if (skb_dst(skb))
937 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 if (skb->len > mtu) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900939 *pmtu = mtu;
940 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 goto tx_err_dst_release;
942 }
943
944 /*
945 * Okay, now see if we can stuff it in the buffer as-is.
946 */
947 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900948
Patrick McHardycfbba492007-07-09 15:33:40 -0700949 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
950 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900952
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
954 goto tx_err_dst_release;
955
956 if (skb->sk)
957 skb_set_owner_w(new_skb, skb->sk);
958 kfree_skb(skb);
959 skb = new_skb;
960 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000961 skb_dst_drop(skb);
962 skb_dst_set(skb, dst_clone(dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700964 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
David S. Miller4c9483b2011-03-12 16:22:43 -0500966 proto = fl6->flowi6_proto;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800967 if (encap_limit >= 0) {
968 init_tel_txopt(&opt, encap_limit);
969 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
970 }
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700971 skb_push(skb, sizeof(struct ipv6hdr));
972 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700973 ipv6h = ipv6_hdr(skb);
David S. Miller4c9483b2011-03-12 16:22:43 -0500974 *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 dsfield = INET_ECN_encapsulate(0, dsfield);
976 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 ipv6h->hop_limit = t->parms.hop_limit;
978 ipv6h->nexthdr = proto;
David S. Miller4c9483b2011-03-12 16:22:43 -0500979 ipv6_addr_copy(&ipv6h->saddr, &fl6->saddr);
980 ipv6_addr_copy(&ipv6h->daddr, &fl6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 nf_reset(skb);
982 pkt_len = skb->len;
Herbert Xuef76bc22008-01-11 19:15:08 -0800983 err = ip6_local_out(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200985 if (net_xmit_eval(err) == 0) {
Eric Dumazet8560f222010-09-28 03:23:34 +0000986 struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats);
987
988 tstats->tx_bytes += pkt_len;
989 tstats->tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 } else {
991 stats->tx_errors++;
992 stats->tx_aborted_errors++;
993 }
994 ip6_tnl_dst_store(t, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 return 0;
996tx_err_link_failure:
997 stats->tx_carrier_errors++;
998 dst_link_failure(skb);
999tx_err_dst_release:
1000 dst_release(dst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001001 return err;
1002}
1003
1004static inline int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001005ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1006{
1007 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001008 struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001009 int encap_limit = -1;
David S. Miller4c9483b2011-03-12 16:22:43 -05001010 struct flowi6 fl6;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001011 __u8 dsfield;
1012 __u32 mtu;
1013 int err;
1014
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001015 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1016 !ip6_tnl_xmit_ctl(t))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001017 return -1;
1018
1019 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1020 encap_limit = t->parms.encap_limit;
1021
David S. Miller4c9483b2011-03-12 16:22:43 -05001022 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1023 fl6.flowi6_proto = IPPROTO_IPIP;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001024
1025 dsfield = ipv4_get_dsfield(iph);
1026
1027 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001028 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
Al Virob77f2fa2007-07-21 19:09:41 -07001029 & IPV6_TCLASS_MASK;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001030
David S. Miller4c9483b2011-03-12 16:22:43 -05001031 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001032 if (err != 0) {
1033 /* XXX: send ICMP error even if DF is not set. */
1034 if (err == -EMSGSIZE)
1035 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1036 htonl(mtu));
1037 return -1;
1038 }
1039
1040 return 0;
1041}
1042
1043static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001044ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1045{
1046 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001047 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001048 int encap_limit = -1;
1049 __u16 offset;
David S. Miller4c9483b2011-03-12 16:22:43 -05001050 struct flowi6 fl6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001051 __u8 dsfield;
1052 __u32 mtu;
1053 int err;
1054
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001055 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1056 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001057 return -1;
1058
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001059 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
1060 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001061 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001062 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001063 if (tel->encap_limit == 0) {
1064 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001065 ICMPV6_HDR_FIELD, offset + 2);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001066 return -1;
1067 }
1068 encap_limit = tel->encap_limit - 1;
1069 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1070 encap_limit = t->parms.encap_limit;
1071
David S. Miller4c9483b2011-03-12 16:22:43 -05001072 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1073 fl6.flowi6_proto = IPPROTO_IPV6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001074
1075 dsfield = ipv6_get_dsfield(ipv6h);
1076 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001077 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001078 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001079 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001080
David S. Miller4c9483b2011-03-12 16:22:43 -05001081 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001082 if (err != 0) {
1083 if (err == -EMSGSIZE)
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001084 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001085 return -1;
1086 }
1087
1088 return 0;
1089}
1090
Stephen Hemminger6fef4c02009-08-31 19:50:41 +00001091static netdev_tx_t
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001092ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1093{
1094 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001095 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001096 int ret;
1097
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001098 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001099 case htons(ETH_P_IP):
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001100 ret = ip4ip6_tnl_xmit(skb, dev);
1101 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001102 case htons(ETH_P_IPV6):
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001103 ret = ip6ip6_tnl_xmit(skb, dev);
1104 break;
1105 default:
1106 goto tx_err;
1107 }
1108
1109 if (ret < 0)
1110 goto tx_err;
1111
Patrick McHardy6ed10652009-06-23 06:03:08 +00001112 return NETDEV_TX_OK;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114tx_err:
1115 stats->tx_errors++;
1116 stats->tx_dropped++;
1117 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +00001118 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119}
1120
1121static void ip6_tnl_set_cap(struct ip6_tnl *t)
1122{
1123 struct ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001124 int ltype = ipv6_addr_type(&p->laddr);
1125 int rtype = ipv6_addr_type(&p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
1127 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
1128
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001129 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1130 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1131 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001132 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001133 if (ltype&IPV6_ADDR_UNICAST)
1134 p->flags |= IP6_TNL_F_CAP_XMIT;
1135 if (rtype&IPV6_ADDR_UNICAST)
1136 p->flags |= IP6_TNL_F_CAP_RCV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 }
1138}
1139
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001140static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141{
1142 struct net_device *dev = t->dev;
1143 struct ip6_tnl_parm *p = &t->parms;
David S. Miller4c9483b2011-03-12 16:22:43 -05001144 struct flowi6 *fl6 = &t->fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145
Jiri Pirko3a6d54c2009-05-11 23:37:15 +00001146 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1147 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148
1149 /* Set up flowi template */
David S. Miller4c9483b2011-03-12 16:22:43 -05001150 ipv6_addr_copy(&fl6->saddr, &p->laddr);
1151 ipv6_addr_copy(&fl6->daddr, &p->raddr);
1152 fl6->flowi6_oif = p->link;
1153 fl6->flowlabel = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
1155 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001156 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001158 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159
1160 ip6_tnl_set_cap(t);
1161
1162 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1163 dev->flags |= IFF_POINTOPOINT;
1164 else
1165 dev->flags &= ~IFF_POINTOPOINT;
1166
1167 dev->iflink = p->link;
1168
1169 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001170 int strict = (ipv6_addr_type(&p->raddr) &
1171 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1172
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001173 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1174 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001175 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176
1177 if (rt == NULL)
1178 return;
1179
1180 if (rt->rt6i_dev) {
1181 dev->hard_header_len = rt->rt6i_dev->hard_header_len +
1182 sizeof (struct ipv6hdr);
1183
1184 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001185 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1186 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187
1188 if (dev->mtu < IPV6_MIN_MTU)
1189 dev->mtu = IPV6_MIN_MTU;
1190 }
Changli Gaod8d1f302010-06-10 23:31:35 -07001191 dst_release(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 }
1193}
1194
1195/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001196 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 * @t: tunnel to be changed
1198 * @p: tunnel configuration parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 *
1200 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001201 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 **/
1203
1204static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001205ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206{
1207 ipv6_addr_copy(&t->parms.laddr, &p->laddr);
1208 ipv6_addr_copy(&t->parms.raddr, &p->raddr);
1209 t->parms.flags = p->flags;
1210 t->parms.hop_limit = p->hop_limit;
1211 t->parms.encap_limit = p->encap_limit;
1212 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001213 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001214 t->parms.proto = p->proto;
Hugo Santos0c088892006-02-24 13:16:25 -08001215 ip6_tnl_dst_reset(t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001216 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 return 0;
1218}
1219
1220/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001221 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 * @dev: virtual device associated with tunnel
1223 * @ifr: parameters passed from userspace
1224 * @cmd: command to be performed
1225 *
1226 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001227 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001228 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 *
1230 * The possible commands are the following:
1231 * %SIOCGETTUNNEL: get tunnel parameters for device
1232 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1233 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1234 * %SIOCDELTUNNEL: delete tunnel
1235 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001236 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 * initialization, can be used for creating other tunnel devices.
1238 *
1239 * Return:
1240 * 0 on success,
1241 * %-EFAULT if unable to copy data to or from userspace,
1242 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1243 * %-EINVAL if passed tunnel parameters are invalid,
1244 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1245 * %-ENODEV if attempting to change or delete a nonexisting device
1246 **/
1247
1248static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001249ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250{
1251 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 struct ip6_tnl_parm p;
1253 struct ip6_tnl *t = NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001254 struct net *net = dev_net(dev);
1255 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256
1257 switch (cmd) {
1258 case SIOCGETTUNNEL:
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001259 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001260 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 err = -EFAULT;
1262 break;
1263 }
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001264 t = ip6_tnl_locate(net, &p, 0);
Ville Nuorvala567131a2006-11-24 17:05:41 -08001265 }
1266 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -08001267 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 memcpy(&p, &t->parms, sizeof (p));
1269 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1270 err = -EFAULT;
1271 }
1272 break;
1273 case SIOCADDTUNNEL:
1274 case SIOCCHGTUNNEL:
1275 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 if (!capable(CAP_NET_ADMIN))
1277 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001278 err = -EFAULT;
1279 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001281 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001282 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1283 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 break;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001285 t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001286 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001287 if (t != NULL) {
1288 if (t->dev != dev) {
1289 err = -EEXIST;
1290 break;
1291 }
1292 } else
1293 t = netdev_priv(dev);
1294
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001295 ip6_tnl_unlink(ip6n, t);
Pavel Emelyanov74b0b852010-10-27 05:43:53 +00001296 synchronize_net();
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001297 err = ip6_tnl_change(t, &p);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001298 ip6_tnl_link(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 netdev_state_change(dev);
1300 }
Ville Nuorvala567131a2006-11-24 17:05:41 -08001301 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 err = 0;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001303 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
1304 err = -EFAULT;
1305
1306 } else
1307 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 break;
1309 case SIOCDELTUNNEL:
1310 err = -EPERM;
1311 if (!capable(CAP_NET_ADMIN))
1312 break;
1313
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001314 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001315 err = -EFAULT;
1316 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001318 err = -ENOENT;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001319 if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001321 err = -EPERM;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001322 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001324 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001326 err = 0;
1327 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 break;
1329 default:
1330 err = -EINVAL;
1331 }
1332 return err;
1333}
1334
1335/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001336 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 * @dev: virtual device associated with tunnel
1338 * @new_mtu: the new mtu
1339 *
1340 * Return:
1341 * 0 on success,
1342 * %-EINVAL if mtu too small
1343 **/
1344
1345static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001346ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347{
1348 if (new_mtu < IPV6_MIN_MTU) {
1349 return -EINVAL;
1350 }
1351 dev->mtu = new_mtu;
1352 return 0;
1353}
1354
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001355
1356static const struct net_device_ops ip6_tnl_netdev_ops = {
Eric Dumazet8560f222010-09-28 03:23:34 +00001357 .ndo_uninit = ip6_tnl_dev_uninit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001358 .ndo_start_xmit = ip6_tnl_xmit,
Eric Dumazet8560f222010-09-28 03:23:34 +00001359 .ndo_do_ioctl = ip6_tnl_ioctl,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001360 .ndo_change_mtu = ip6_tnl_change_mtu,
Eric Dumazet8560f222010-09-28 03:23:34 +00001361 .ndo_get_stats = ip6_get_stats,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001362};
1363
Eric Dumazet8560f222010-09-28 03:23:34 +00001364
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001366 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 * @dev: virtual device associated with tunnel
1368 *
1369 * Description:
1370 * Initialize function pointers and device parameters
1371 **/
1372
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001373static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374{
Anders Franzen381601e2010-11-24 05:47:18 +00001375 struct ip6_tnl *t;
1376
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001377 dev->netdev_ops = &ip6_tnl_netdev_ops;
Eric Dumazet8560f222010-09-28 03:23:34 +00001378 dev->destructor = ip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
1380 dev->type = ARPHRD_TUNNEL6;
1381 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1382 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001383 t = netdev_priv(dev);
1384 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1385 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 dev->flags |= IFF_NOARP;
1387 dev->addr_len = sizeof(struct in6_addr);
Pavel Emelyanov554eb272008-04-16 01:24:13 -07001388 dev->features |= NETIF_F_NETNS_LOCAL;
Anders Franzen7e223de2010-10-19 03:50:47 +00001389 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390}
1391
1392
1393/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001394 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 * @dev: virtual device associated with tunnel
1396 **/
1397
Eric Dumazet8560f222010-09-28 03:23:34 +00001398static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001399ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400{
Patrick McHardy2941a482006-01-08 22:05:26 -08001401 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001402
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 t->dev = dev;
1404 strcpy(t->parms.name, dev->name);
Eric Dumazet8560f222010-09-28 03:23:34 +00001405 dev->tstats = alloc_percpu(struct pcpu_tstats);
1406 if (!dev->tstats)
1407 return -ENOMEM;
1408 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409}
1410
1411/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001412 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 * @dev: virtual device associated with tunnel
1414 **/
1415
Eric Dumazet8560f222010-09-28 03:23:34 +00001416static int ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417{
Patrick McHardy2941a482006-01-08 22:05:26 -08001418 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001419 int err = ip6_tnl_dev_init_gen(dev);
1420
1421 if (err)
1422 return err;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001423 ip6_tnl_link_config(t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001424 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425}
1426
1427/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001428 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 * @dev: fallback device
1430 *
1431 * Return: 0
1432 **/
1433
Eric Dumazet8560f222010-09-28 03:23:34 +00001434static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435{
Patrick McHardy2941a482006-01-08 22:05:26 -08001436 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001437 struct net *net = dev_net(dev);
1438 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Eric Dumazet8560f222010-09-28 03:23:34 +00001439 int err = ip6_tnl_dev_init_gen(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001440
Eric Dumazet8560f222010-09-28 03:23:34 +00001441 if (err)
1442 return err;
1443
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001444 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 dev_hold(dev);
Eric Dumazet94767632010-09-15 20:25:34 +00001446 rcu_assign_pointer(ip6n->tnls_wc[0], t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001447 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448}
1449
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001450static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001451 .handler = ip4ip6_rcv,
1452 .err_handler = ip4ip6_err,
1453 .priority = 1,
1454};
1455
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001456static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
Patrick McHardy03037702005-07-19 14:03:34 -07001457 .handler = ip6ip6_rcv,
1458 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08001459 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460};
1461
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001462static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001463{
1464 int h;
1465 struct ip6_tnl *t;
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001466 LIST_HEAD(list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001467
1468 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet94767632010-09-15 20:25:34 +00001469 t = rtnl_dereference(ip6n->tnls_r_l[h]);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001470 while (t != NULL) {
1471 unregister_netdevice_queue(t->dev, &list);
Eric Dumazet94767632010-09-15 20:25:34 +00001472 t = rtnl_dereference(t->next);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001473 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001474 }
1475
Eric Dumazet94767632010-09-15 20:25:34 +00001476 t = rtnl_dereference(ip6n->tnls_wc[0]);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001477 unregister_netdevice_queue(t->dev, &list);
1478 unregister_netdevice_many(&list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001479}
1480
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001481static int __net_init ip6_tnl_init_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001482{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001483 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001484 int err;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001485
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001486 ip6n->tnls[0] = ip6n->tnls_wc;
1487 ip6n->tnls[1] = ip6n->tnls_r_l;
1488
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001489 err = -ENOMEM;
1490 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1491 ip6_tnl_dev_setup);
1492
1493 if (!ip6n->fb_tnl_dev)
1494 goto err_alloc_dev;
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001495 dev_net_set(ip6n->fb_tnl_dev, net);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001496
Eric Dumazet8560f222010-09-28 03:23:34 +00001497 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1498 if (err < 0)
1499 goto err_register;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001500
1501 err = register_netdev(ip6n->fb_tnl_dev);
1502 if (err < 0)
1503 goto err_register;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001504 return 0;
1505
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001506err_register:
Eric Dumazet8560f222010-09-28 03:23:34 +00001507 ip6_dev_free(ip6n->fb_tnl_dev);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001508err_alloc_dev:
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001509 return err;
1510}
1511
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001512static void __net_exit ip6_tnl_exit_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001513{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001514 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001515
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001516 rtnl_lock();
1517 ip6_tnl_destroy_tunnels(ip6n);
1518 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001519}
1520
1521static struct pernet_operations ip6_tnl_net_ops = {
1522 .init = ip6_tnl_init_net,
1523 .exit = ip6_tnl_exit_net,
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001524 .id = &ip6_tnl_net_id,
1525 .size = sizeof(struct ip6_tnl_net),
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001526};
1527
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528/**
1529 * ip6_tunnel_init - register protocol and reserve needed resources
1530 *
1531 * Return: 0 on success
1532 **/
1533
1534static int __init ip6_tunnel_init(void)
1535{
1536 int err;
1537
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001538 err = register_pernet_device(&ip6_tnl_net_ops);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001539 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001540 goto out_pernet;
1541
1542 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1543 if (err < 0) {
1544 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
1545 goto out_ip4ip6;
1546 }
1547
1548 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1549 if (err < 0) {
1550 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
1551 goto out_ip6ip6;
1552 }
1553
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 return 0;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001555
1556out_ip6ip6:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001557 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001558out_ip4ip6:
1559 unregister_pernet_device(&ip6_tnl_net_ops);
1560out_pernet:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561 return err;
1562}
1563
1564/**
1565 * ip6_tunnel_cleanup - free resources and unregister protocol
1566 **/
1567
1568static void __exit ip6_tunnel_cleanup(void)
1569{
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001570 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001571 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001572
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001573 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001574 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001576 unregister_pernet_device(&ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577}
1578
1579module_init(ip6_tunnel_init);
1580module_exit(ip6_tunnel_cleanup);