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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 *
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000165ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const 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 **
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000197ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000199 const struct in6_addr *remote = &p->raddr;
200 const struct in6_addr *local = &p->laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 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
Patrick McHardy2941a482006-01-08 22:05:26 -0800283 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 t->parms = *p;
Eric Dumazet8560f222010-09-28 03:23:34 +0000285 err = ip6_tnl_dev_init(dev);
286 if (err < 0)
287 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800289 if ((err = register_netdevice(dev)) < 0)
290 goto failed_free;
291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 dev_hold(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700293 ip6_tnl_link(ip6n, t);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800294 return t;
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800295
296failed_free:
Eric Dumazet8560f222010-09-28 03:23:34 +0000297 ip6_dev_free(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800298failed:
299 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
301
302/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900303 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900304 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 * @create: != 0 if allowed to create new tunnel if no match found
306 *
307 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900308 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 * based on @parms. If this is unsuccessful, but @create is set a new
310 * tunnel device is created and registered for use.
311 *
312 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800313 * matching tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 **/
315
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700316static struct ip6_tnl *ip6_tnl_locate(struct net *net,
317 struct ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000319 const struct in6_addr *remote = &p->raddr;
320 const struct in6_addr *local = &p->laddr;
Eric Dumazet94767632010-09-15 20:25:34 +0000321 struct ip6_tnl __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700323 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Eric Dumazet94767632010-09-15 20:25:34 +0000325 for (tp = ip6_tnl_bucket(ip6n, p);
326 (t = rtnl_dereference(*tp)) != NULL;
327 tp = &t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Ville Nuorvala567131a2006-11-24 17:05:41 -0800329 ipv6_addr_equal(remote, &t->parms.raddr))
330 return t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 }
332 if (!create)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800333 return NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700334 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335}
336
337/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900338 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900340 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900342 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 **/
344
345static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900346ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
Patrick McHardy2941a482006-01-08 22:05:26 -0800348 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700349 struct net *net = dev_net(dev);
350 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Eric Dumazet94767632010-09-15 20:25:34 +0000352 if (dev == ip6n->fb_tnl_dev)
353 rcu_assign_pointer(ip6n->tnls_wc[0], NULL);
354 else
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700355 ip6_tnl_unlink(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 ip6_tnl_dst_reset(t);
357 dev_put(dev);
358}
359
360/**
361 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
362 * @skb: received socket buffer
363 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900364 * Return:
365 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 * else index to encapsulation limit
367 **/
368
369static __u16
370parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
371{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000372 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 __u8 nexthdr = ipv6h->nexthdr;
374 __u16 off = sizeof (*ipv6h);
375
376 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
377 __u16 optlen = 0;
378 struct ipv6_opt_hdr *hdr;
379 if (raw + off + sizeof (*hdr) > skb->data &&
380 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
381 break;
382
383 hdr = (struct ipv6_opt_hdr *) (raw + off);
384 if (nexthdr == NEXTHDR_FRAGMENT) {
385 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
386 if (frag_hdr->frag_off)
387 break;
388 optlen = 8;
389 } else if (nexthdr == NEXTHDR_AUTH) {
390 optlen = (hdr->hdrlen + 2) << 2;
391 } else {
392 optlen = ipv6_optlen(hdr);
393 }
394 if (nexthdr == NEXTHDR_DEST) {
395 __u16 i = off + 2;
396 while (1) {
397 struct ipv6_tlv_tnl_enc_lim *tel;
398
399 /* No more room for encapsulation limit */
400 if (i + sizeof (*tel) > off + optlen)
401 break;
402
403 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
404 /* return index of option if found and valid */
405 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
406 tel->length == 1)
407 return i;
408 /* else jump to next option */
409 if (tel->type)
410 i += tel->length + 2;
411 else
412 i++;
413 }
414 }
415 nexthdr = hdr->nexthdr;
416 off += optlen;
417 }
418 return 0;
419}
420
421/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900422 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 *
424 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900425 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 * to the specifications in RFC 2473.
427 **/
428
Herbert Xud2acc342006-03-28 01:12:13 -0800429static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900430ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700431 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000433 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 struct ip6_tnl *t;
435 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700436 u8 rel_type = ICMPV6_DEST_UNREACH;
437 u8 rel_code = ICMPV6_ADDR_UNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 __u32 rel_info = 0;
439 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800440 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900442 /* If the packet doesn't contain the original IPv6 header we are
443 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 processing of the error. */
445
Eric Dumazet2922bc82009-10-23 06:34:34 +0000446 rcu_read_lock();
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700447 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700448 &ipv6h->saddr)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 goto out;
450
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900451 if (t->parms.proto != ipproto && t->parms.proto != 0)
452 goto out;
453
Herbert Xud2acc342006-03-28 01:12:13 -0800454 err = 0;
455
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900456 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 __u32 teli;
458 struct ipv6_tlv_tnl_enc_lim *tel;
459 __u32 mtu;
460 case ICMPV6_DEST_UNREACH:
461 if (net_ratelimit())
462 printk(KERN_WARNING
463 "%s: Path to destination invalid "
464 "or inactive!\n", t->parms.name);
465 rel_msg = 1;
466 break;
467 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900468 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 if (net_ratelimit())
470 printk(KERN_WARNING
471 "%s: Too small hop limit or "
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900472 "routing loop in tunnel!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 t->parms.name);
474 rel_msg = 1;
475 }
476 break;
477 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800478 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900479 if ((*code) == ICMPV6_HDR_FIELD)
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800480 teli = parse_tlv_tnl_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
Al Viro704eae12007-07-26 17:33:29 +0100482 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
484 if (tel->encap_limit == 0) {
485 if (net_ratelimit())
486 printk(KERN_WARNING
487 "%s: Too small encapsulation "
488 "limit or routing loop in "
489 "tunnel!\n", t->parms.name);
490 rel_msg = 1;
491 }
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800492 } else if (net_ratelimit()) {
493 printk(KERN_WARNING
494 "%s: Recipient unable to parse tunneled "
495 "packet!\n ", t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 }
497 break;
498 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100499 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (mtu < IPV6_MIN_MTU)
501 mtu = IPV6_MIN_MTU;
502 t->dev->mtu = mtu;
503
Al Virocc6cdac2006-02-18 16:02:18 -0500504 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 rel_type = ICMPV6_PKT_TOOBIG;
506 rel_code = 0;
507 rel_info = mtu;
508 rel_msg = 1;
509 }
510 break;
511 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900512
513 *type = rel_type;
514 *code = rel_code;
515 *info = rel_info;
516 *msg = rel_msg;
517
518out:
Eric Dumazet2922bc82009-10-23 06:34:34 +0000519 rcu_read_unlock();
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900520 return err;
521}
522
523static int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900524ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700525 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900526{
527 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700528 u8 rel_type = type;
529 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100530 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900531 int err;
532 struct sk_buff *skb2;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000533 const struct iphdr *eiph;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900534 struct rtable *rt;
David S. Miller31e45432011-05-03 20:25:42 -0700535 struct flowi4 fl4;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900536
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900537 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
538 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900539 if (err < 0)
540 return err;
541
542 if (rel_msg == 0)
543 return 0;
544
545 switch (rel_type) {
546 case ICMPV6_DEST_UNREACH:
547 if (rel_code != ICMPV6_ADDR_UNREACH)
548 return 0;
549 rel_type = ICMP_DEST_UNREACH;
550 rel_code = ICMP_HOST_UNREACH;
551 break;
552 case ICMPV6_PKT_TOOBIG:
553 if (rel_code != 0)
554 return 0;
555 rel_type = ICMP_DEST_UNREACH;
556 rel_code = ICMP_FRAG_NEEDED;
557 break;
558 default:
559 return 0;
560 }
561
562 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
563 return 0;
564
565 skb2 = skb_clone(skb, GFP_ATOMIC);
566 if (!skb2)
567 return 0;
568
Eric Dumazetadf30902009-06-02 05:19:30 +0000569 skb_dst_drop(skb2);
570
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900571 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700572 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700573 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900574
575 /* Try to guess incoming interface */
David S. Miller31e45432011-05-03 20:25:42 -0700576 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500577 eiph->saddr, 0,
578 0, 0,
579 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800580 if (IS_ERR(rt))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900581 goto out;
582
Changli Gaod8d1f302010-06-10 23:31:35 -0700583 skb2->dev = rt->dst.dev;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900584
585 /* route "incoming" packet */
586 if (rt->rt_flags & RTCF_LOCAL) {
587 ip_rt_put(rt);
588 rt = NULL;
David S. Miller31e45432011-05-03 20:25:42 -0700589 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500590 eiph->daddr, eiph->saddr,
591 0, 0,
592 IPPROTO_IPIP,
593 RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800594 if (IS_ERR(rt) ||
Changli Gaod8d1f302010-06-10 23:31:35 -0700595 rt->dst.dev->type != ARPHRD_TUNNEL) {
David S. Millerb23dd4f2011-03-02 14:31:35 -0800596 if (!IS_ERR(rt))
597 ip_rt_put(rt);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900598 goto out;
599 }
David S. Millerb23dd4f2011-03-02 14:31:35 -0800600 skb_dst_set(skb2, &rt->dst);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900601 } else {
602 ip_rt_put(rt);
603 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
604 skb2->dev) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000605 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900606 goto out;
607 }
608
609 /* change mtu on this route */
610 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000611 if (rel_info > dst_mtu(skb_dst(skb2)))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900612 goto out;
613
Eric Dumazetadf30902009-06-02 05:19:30 +0000614 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900615 }
616
Al Viro704eae12007-07-26 17:33:29 +0100617 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900618
619out:
620 kfree_skb(skb2);
621 return 0;
622}
623
624static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900625ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700626 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900627{
628 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700629 u8 rel_type = type;
630 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100631 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900632 int err;
633
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900634 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
635 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900636 if (err < 0)
637 return err;
638
639 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 struct rt6_info *rt;
641 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800642
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900644 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Eric Dumazetadf30902009-06-02 05:19:30 +0000646 skb_dst_drop(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700648 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
650 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700651 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
652 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653
654 if (rt && rt->rt6i_dev)
655 skb2->dev = rt->rt6i_dev;
656
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000657 icmpv6_send(skb2, rel_type, rel_code, rel_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
659 if (rt)
Changli Gaod8d1f302010-06-10 23:31:35 -0700660 dst_release(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
662 kfree_skb(skb2);
663 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900664
665 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666}
667
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000668static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
669 const struct ipv6hdr *ipv6h,
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900670 struct sk_buff *skb)
671{
672 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
673
674 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700675 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900676
677 if (INET_ECN_is_ce(dsfield))
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700678 IP_ECN_set_ce(ip_hdr(skb));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900679}
680
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000681static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
682 const struct ipv6hdr *ipv6h,
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900683 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900685 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b42007-11-13 21:40:13 -0800686 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900688 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700689 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900691
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100692/* called with rcu_read_lock() */
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800693static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
694{
695 struct ip6_tnl_parm *p = &t->parms;
696 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700697 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800698
699 if (p->flags & IP6_TNL_F_CAP_RCV) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900700 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800701
702 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100703 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800704
705 if ((ipv6_addr_is_multicast(&p->laddr) ||
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700706 likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
707 likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800708 ret = 1;
709
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800710 }
711 return ret;
712}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
714/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900715 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 * @skb: received socket buffer
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900717 * @protocol: ethernet protocol ID
718 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 *
720 * Return: 0
721 **/
722
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900723static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900724 __u8 ipproto,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000725 void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
726 const struct ipv6hdr *ipv6h,
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900727 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 struct ip6_tnl *t;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000730 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
Eric Dumazet2922bc82009-10-23 06:34:34 +0000732 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700734 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700735 &ipv6h->daddr)) != NULL) {
Eric Dumazet8560f222010-09-28 03:23:34 +0000736 struct pcpu_tstats *tstats;
737
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900738 if (t->parms.proto != ipproto && t->parms.proto != 0) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000739 rcu_read_unlock();
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900740 goto discard;
741 }
742
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000744 rcu_read_unlock();
Herbert Xu50fba2a2006-04-04 13:50:45 -0700745 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 }
747
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800748 if (!ip6_tnl_rcv_ctl(t)) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700749 t->dev->stats.rx_dropped++;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000750 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 goto discard;
752 }
753 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700754 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700755 skb_reset_network_header(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900756 skb->protocol = htons(protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 skb->pkt_type = PACKET_HOST;
758 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700759
Eric Dumazet8560f222010-09-28 03:23:34 +0000760 tstats = this_cpu_ptr(t->dev->tstats);
761 tstats->rx_packets++;
762 tstats->rx_bytes += skb->len;
763
764 __skb_tunnel_rx(skb, t->dev);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900765
766 dscp_ecn_decapsulate(t, ipv6h, skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000767
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000768 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000769
Eric Dumazet2922bc82009-10-23 06:34:34 +0000770 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 return 0;
772 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000773 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 return 1;
Herbert Xu50fba2a2006-04-04 13:50:45 -0700775
776discard:
777 kfree_skb(skb);
778 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779}
780
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900781static int ip4ip6_rcv(struct sk_buff *skb)
782{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900783 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
784 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900785}
786
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900787static int ip6ip6_rcv(struct sk_buff *skb)
788{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900789 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
790 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900791}
792
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800793struct ipv6_tel_txoption {
794 struct ipv6_txoptions ops;
795 __u8 dst_opt[8];
796};
797
798static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800800 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800802 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
803 opt->dst_opt[3] = 1;
804 opt->dst_opt[4] = encap_limit;
805 opt->dst_opt[5] = IPV6_TLV_PADN;
806 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800808 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
809 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810}
811
812/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900813 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900815 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 *
817 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900818 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 * doesn't match source of incoming packet.
820 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900821 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 * 1 if conflict,
823 * 0 else
824 **/
825
826static inline int
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000827ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828{
829 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
830}
831
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800832static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
833{
834 struct ip6_tnl_parm *p = &t->parms;
835 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700836 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800837
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900838 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800839 struct net_device *ldev = NULL;
840
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100841 rcu_read_lock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800842 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100843 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800844
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700845 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800846 printk(KERN_WARNING
847 "%s xmit: Local address not yet configured!\n",
848 p->name);
849 else if (!ipv6_addr_is_multicast(&p->raddr) &&
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700850 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800851 printk(KERN_WARNING
852 "%s xmit: Routing loop! "
853 "Remote address found on this node!\n",
854 p->name);
855 else
856 ret = 1;
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100857 rcu_read_unlock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800858 }
859 return ret;
860}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861/**
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900862 * ip6_tnl_xmit2 - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900864 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900865 * @dsfield: dscp code for outer header
866 * @fl: flow of tunneled packet
867 * @encap_limit: encapsulation limit
868 * @pmtu: Path MTU is stored if packet is too big
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 *
870 * Description:
871 * Build new header and do some sanity checks on the packet before sending
872 * it.
873 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900874 * Return:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900875 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900876 * -1 fail
877 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 **/
879
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900880static int ip6_tnl_xmit2(struct sk_buff *skb,
881 struct net_device *dev,
882 __u8 dsfield,
David S. Miller4c9483b2011-03-12 16:22:43 -0500883 struct flowi6 *fl6,
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900884 int encap_limit,
885 __u32 *pmtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886{
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800887 struct net *net = dev_net(dev);
Patrick McHardy2941a482006-01-08 22:05:26 -0800888 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700889 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700890 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800891 struct ipv6_tel_txoption opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 struct dst_entry *dst;
893 struct net_device *tdev;
894 int mtu;
Chuck Leverc2636b42007-10-23 21:07:32 -0700895 unsigned int max_headroom = sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 u8 proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900897 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 int pkt_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 if ((dst = ip6_tnl_dst_check(t)) != NULL)
901 dst_hold(dst);
Patrick McHardya57ebc92005-09-08 14:27:47 -0700902 else {
David S. Miller4c9483b2011-03-12 16:22:43 -0500903 dst = ip6_route_output(net, NULL, fl6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
David S. Miller452edd52011-03-02 13:27:41 -0800905 if (dst->error)
Patrick McHardya57ebc92005-09-08 14:27:47 -0700906 goto tx_err_link_failure;
David S. Miller4c9483b2011-03-12 16:22:43 -0500907 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
David S. Miller452edd52011-03-02 13:27:41 -0800908 if (IS_ERR(dst)) {
909 err = PTR_ERR(dst);
910 dst = NULL;
911 goto tx_err_link_failure;
912 }
Patrick McHardya57ebc92005-09-08 14:27:47 -0700913 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914
915 tdev = dst->dev;
916
917 if (tdev == dev) {
918 stats->collisions++;
919 if (net_ratelimit())
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900920 printk(KERN_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 "%s: Local routing loop detected!\n",
922 t->parms.name);
923 goto tx_err_dst_release;
924 }
925 mtu = dst_mtu(dst) - sizeof (*ipv6h);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800926 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 max_headroom += 8;
928 mtu -= 8;
929 }
930 if (mtu < IPV6_MIN_MTU)
931 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +0000932 if (skb_dst(skb))
933 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 if (skb->len > mtu) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900935 *pmtu = mtu;
936 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 goto tx_err_dst_release;
938 }
939
940 /*
941 * Okay, now see if we can stuff it in the buffer as-is.
942 */
943 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900944
Patrick McHardycfbba492007-07-09 15:33:40 -0700945 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
946 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900948
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
950 goto tx_err_dst_release;
951
952 if (skb->sk)
953 skb_set_owner_w(new_skb, skb->sk);
954 kfree_skb(skb);
955 skb = new_skb;
956 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000957 skb_dst_drop(skb);
958 skb_dst_set(skb, dst_clone(dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700960 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961
David S. Miller4c9483b2011-03-12 16:22:43 -0500962 proto = fl6->flowi6_proto;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800963 if (encap_limit >= 0) {
964 init_tel_txopt(&opt, encap_limit);
965 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
966 }
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700967 skb_push(skb, sizeof(struct ipv6hdr));
968 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700969 ipv6h = ipv6_hdr(skb);
David S. Miller4c9483b2011-03-12 16:22:43 -0500970 *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 dsfield = INET_ECN_encapsulate(0, dsfield);
972 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 ipv6h->hop_limit = t->parms.hop_limit;
974 ipv6h->nexthdr = proto;
David S. Miller4c9483b2011-03-12 16:22:43 -0500975 ipv6_addr_copy(&ipv6h->saddr, &fl6->saddr);
976 ipv6_addr_copy(&ipv6h->daddr, &fl6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 nf_reset(skb);
978 pkt_len = skb->len;
Herbert Xuef76bc22008-01-11 19:15:08 -0800979 err = ip6_local_out(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200981 if (net_xmit_eval(err) == 0) {
Eric Dumazet8560f222010-09-28 03:23:34 +0000982 struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats);
983
984 tstats->tx_bytes += pkt_len;
985 tstats->tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 } else {
987 stats->tx_errors++;
988 stats->tx_aborted_errors++;
989 }
990 ip6_tnl_dst_store(t, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 return 0;
992tx_err_link_failure:
993 stats->tx_carrier_errors++;
994 dst_link_failure(skb);
995tx_err_dst_release:
996 dst_release(dst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900997 return err;
998}
999
1000static inline int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001001ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1002{
1003 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001004 const struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001005 int encap_limit = -1;
David S. Miller4c9483b2011-03-12 16:22:43 -05001006 struct flowi6 fl6;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001007 __u8 dsfield;
1008 __u32 mtu;
1009 int err;
1010
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001011 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1012 !ip6_tnl_xmit_ctl(t))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001013 return -1;
1014
1015 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1016 encap_limit = t->parms.encap_limit;
1017
David S. Miller4c9483b2011-03-12 16:22:43 -05001018 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1019 fl6.flowi6_proto = IPPROTO_IPIP;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001020
1021 dsfield = ipv4_get_dsfield(iph);
1022
1023 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001024 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
Al Virob77f2fa2007-07-21 19:09:41 -07001025 & IPV6_TCLASS_MASK;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001026
David S. Miller4c9483b2011-03-12 16:22:43 -05001027 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001028 if (err != 0) {
1029 /* XXX: send ICMP error even if DF is not set. */
1030 if (err == -EMSGSIZE)
1031 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1032 htonl(mtu));
1033 return -1;
1034 }
1035
1036 return 0;
1037}
1038
1039static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001040ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1041{
1042 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001043 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001044 int encap_limit = -1;
1045 __u16 offset;
David S. Miller4c9483b2011-03-12 16:22:43 -05001046 struct flowi6 fl6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001047 __u8 dsfield;
1048 __u32 mtu;
1049 int err;
1050
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001051 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1052 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001053 return -1;
1054
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001055 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
1056 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001057 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001058 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001059 if (tel->encap_limit == 0) {
1060 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001061 ICMPV6_HDR_FIELD, offset + 2);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001062 return -1;
1063 }
1064 encap_limit = tel->encap_limit - 1;
1065 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1066 encap_limit = t->parms.encap_limit;
1067
David S. Miller4c9483b2011-03-12 16:22:43 -05001068 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1069 fl6.flowi6_proto = IPPROTO_IPV6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001070
1071 dsfield = ipv6_get_dsfield(ipv6h);
1072 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001073 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001074 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001075 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001076
David S. Miller4c9483b2011-03-12 16:22:43 -05001077 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001078 if (err != 0) {
1079 if (err == -EMSGSIZE)
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001080 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001081 return -1;
1082 }
1083
1084 return 0;
1085}
1086
Stephen Hemminger6fef4c02009-08-31 19:50:41 +00001087static netdev_tx_t
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001088ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1089{
1090 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001091 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001092 int ret;
1093
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001094 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001095 case htons(ETH_P_IP):
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001096 ret = ip4ip6_tnl_xmit(skb, dev);
1097 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001098 case htons(ETH_P_IPV6):
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001099 ret = ip6ip6_tnl_xmit(skb, dev);
1100 break;
1101 default:
1102 goto tx_err;
1103 }
1104
1105 if (ret < 0)
1106 goto tx_err;
1107
Patrick McHardy6ed10652009-06-23 06:03:08 +00001108 return NETDEV_TX_OK;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001109
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110tx_err:
1111 stats->tx_errors++;
1112 stats->tx_dropped++;
1113 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +00001114 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115}
1116
1117static void ip6_tnl_set_cap(struct ip6_tnl *t)
1118{
1119 struct ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001120 int ltype = ipv6_addr_type(&p->laddr);
1121 int rtype = ipv6_addr_type(&p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122
1123 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
1124
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001125 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1126 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1127 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001128 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001129 if (ltype&IPV6_ADDR_UNICAST)
1130 p->flags |= IP6_TNL_F_CAP_XMIT;
1131 if (rtype&IPV6_ADDR_UNICAST)
1132 p->flags |= IP6_TNL_F_CAP_RCV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 }
1134}
1135
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001136static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137{
1138 struct net_device *dev = t->dev;
1139 struct ip6_tnl_parm *p = &t->parms;
David S. Miller4c9483b2011-03-12 16:22:43 -05001140 struct flowi6 *fl6 = &t->fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141
Jiri Pirko3a6d54c2009-05-11 23:37:15 +00001142 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1143 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144
1145 /* Set up flowi template */
David S. Miller4c9483b2011-03-12 16:22:43 -05001146 ipv6_addr_copy(&fl6->saddr, &p->laddr);
1147 ipv6_addr_copy(&fl6->daddr, &p->raddr);
1148 fl6->flowi6_oif = p->link;
1149 fl6->flowlabel = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150
1151 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001152 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001154 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155
1156 ip6_tnl_set_cap(t);
1157
1158 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1159 dev->flags |= IFF_POINTOPOINT;
1160 else
1161 dev->flags &= ~IFF_POINTOPOINT;
1162
1163 dev->iflink = p->link;
1164
1165 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001166 int strict = (ipv6_addr_type(&p->raddr) &
1167 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1168
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001169 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1170 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001171 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
1173 if (rt == NULL)
1174 return;
1175
1176 if (rt->rt6i_dev) {
1177 dev->hard_header_len = rt->rt6i_dev->hard_header_len +
1178 sizeof (struct ipv6hdr);
1179
1180 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001181 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1182 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
1184 if (dev->mtu < IPV6_MIN_MTU)
1185 dev->mtu = IPV6_MIN_MTU;
1186 }
Changli Gaod8d1f302010-06-10 23:31:35 -07001187 dst_release(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 }
1189}
1190
1191/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001192 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 * @t: tunnel to be changed
1194 * @p: tunnel configuration parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 *
1196 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001197 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 **/
1199
1200static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001201ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202{
1203 ipv6_addr_copy(&t->parms.laddr, &p->laddr);
1204 ipv6_addr_copy(&t->parms.raddr, &p->raddr);
1205 t->parms.flags = p->flags;
1206 t->parms.hop_limit = p->hop_limit;
1207 t->parms.encap_limit = p->encap_limit;
1208 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001209 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001210 t->parms.proto = p->proto;
Hugo Santos0c088892006-02-24 13:16:25 -08001211 ip6_tnl_dst_reset(t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001212 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 return 0;
1214}
1215
1216/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001217 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 * @dev: virtual device associated with tunnel
1219 * @ifr: parameters passed from userspace
1220 * @cmd: command to be performed
1221 *
1222 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001223 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001224 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 *
1226 * The possible commands are the following:
1227 * %SIOCGETTUNNEL: get tunnel parameters for device
1228 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1229 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1230 * %SIOCDELTUNNEL: delete tunnel
1231 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001232 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 * initialization, can be used for creating other tunnel devices.
1234 *
1235 * Return:
1236 * 0 on success,
1237 * %-EFAULT if unable to copy data to or from userspace,
1238 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1239 * %-EINVAL if passed tunnel parameters are invalid,
1240 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1241 * %-ENODEV if attempting to change or delete a nonexisting device
1242 **/
1243
1244static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001245ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246{
1247 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 struct ip6_tnl_parm p;
1249 struct ip6_tnl *t = NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001250 struct net *net = dev_net(dev);
1251 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252
1253 switch (cmd) {
1254 case SIOCGETTUNNEL:
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001255 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001256 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 err = -EFAULT;
1258 break;
1259 }
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001260 t = ip6_tnl_locate(net, &p, 0);
Ville Nuorvala567131a2006-11-24 17:05:41 -08001261 }
1262 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -08001263 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 memcpy(&p, &t->parms, sizeof (p));
1265 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1266 err = -EFAULT;
1267 }
1268 break;
1269 case SIOCADDTUNNEL:
1270 case SIOCCHGTUNNEL:
1271 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 if (!capable(CAP_NET_ADMIN))
1273 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001274 err = -EFAULT;
1275 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001277 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001278 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1279 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 break;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001281 t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001282 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001283 if (t != NULL) {
1284 if (t->dev != dev) {
1285 err = -EEXIST;
1286 break;
1287 }
1288 } else
1289 t = netdev_priv(dev);
1290
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001291 ip6_tnl_unlink(ip6n, t);
Pavel Emelyanov74b0b852010-10-27 05:43:53 +00001292 synchronize_net();
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001293 err = ip6_tnl_change(t, &p);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001294 ip6_tnl_link(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 netdev_state_change(dev);
1296 }
Ville Nuorvala567131a2006-11-24 17:05:41 -08001297 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 err = 0;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001299 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
1300 err = -EFAULT;
1301
1302 } else
1303 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 break;
1305 case SIOCDELTUNNEL:
1306 err = -EPERM;
1307 if (!capable(CAP_NET_ADMIN))
1308 break;
1309
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001310 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001311 err = -EFAULT;
1312 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001314 err = -ENOENT;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001315 if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001317 err = -EPERM;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001318 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001320 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001322 err = 0;
1323 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 break;
1325 default:
1326 err = -EINVAL;
1327 }
1328 return err;
1329}
1330
1331/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001332 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 * @dev: virtual device associated with tunnel
1334 * @new_mtu: the new mtu
1335 *
1336 * Return:
1337 * 0 on success,
1338 * %-EINVAL if mtu too small
1339 **/
1340
1341static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001342ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343{
1344 if (new_mtu < IPV6_MIN_MTU) {
1345 return -EINVAL;
1346 }
1347 dev->mtu = new_mtu;
1348 return 0;
1349}
1350
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001351
1352static const struct net_device_ops ip6_tnl_netdev_ops = {
Eric Dumazet8560f222010-09-28 03:23:34 +00001353 .ndo_uninit = ip6_tnl_dev_uninit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001354 .ndo_start_xmit = ip6_tnl_xmit,
Eric Dumazet8560f222010-09-28 03:23:34 +00001355 .ndo_do_ioctl = ip6_tnl_ioctl,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001356 .ndo_change_mtu = ip6_tnl_change_mtu,
Eric Dumazet8560f222010-09-28 03:23:34 +00001357 .ndo_get_stats = ip6_get_stats,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001358};
1359
Eric Dumazet8560f222010-09-28 03:23:34 +00001360
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001362 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 * @dev: virtual device associated with tunnel
1364 *
1365 * Description:
1366 * Initialize function pointers and device parameters
1367 **/
1368
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001369static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370{
Anders Franzen381601e2010-11-24 05:47:18 +00001371 struct ip6_tnl *t;
1372
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001373 dev->netdev_ops = &ip6_tnl_netdev_ops;
Eric Dumazet8560f222010-09-28 03:23:34 +00001374 dev->destructor = ip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375
1376 dev->type = ARPHRD_TUNNEL6;
1377 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1378 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001379 t = netdev_priv(dev);
1380 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1381 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 dev->flags |= IFF_NOARP;
1383 dev->addr_len = sizeof(struct in6_addr);
Pavel Emelyanov554eb272008-04-16 01:24:13 -07001384 dev->features |= NETIF_F_NETNS_LOCAL;
Anders Franzen7e223de2010-10-19 03:50:47 +00001385 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386}
1387
1388
1389/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001390 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 * @dev: virtual device associated with tunnel
1392 **/
1393
Eric Dumazet8560f222010-09-28 03:23:34 +00001394static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001395ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396{
Patrick McHardy2941a482006-01-08 22:05:26 -08001397 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001398
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 t->dev = dev;
1400 strcpy(t->parms.name, dev->name);
Eric Dumazet8560f222010-09-28 03:23:34 +00001401 dev->tstats = alloc_percpu(struct pcpu_tstats);
1402 if (!dev->tstats)
1403 return -ENOMEM;
1404 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405}
1406
1407/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001408 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 * @dev: virtual device associated with tunnel
1410 **/
1411
Eric Dumazet8560f222010-09-28 03:23:34 +00001412static int ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413{
Patrick McHardy2941a482006-01-08 22:05:26 -08001414 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001415 int err = ip6_tnl_dev_init_gen(dev);
1416
1417 if (err)
1418 return err;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001419 ip6_tnl_link_config(t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001420 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421}
1422
1423/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001424 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 * @dev: fallback device
1426 *
1427 * Return: 0
1428 **/
1429
Eric Dumazet8560f222010-09-28 03:23:34 +00001430static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431{
Patrick McHardy2941a482006-01-08 22:05:26 -08001432 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001433 struct net *net = dev_net(dev);
1434 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Eric Dumazet8560f222010-09-28 03:23:34 +00001435 int err = ip6_tnl_dev_init_gen(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001436
Eric Dumazet8560f222010-09-28 03:23:34 +00001437 if (err)
1438 return err;
1439
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001440 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 dev_hold(dev);
Eric Dumazet94767632010-09-15 20:25:34 +00001442 rcu_assign_pointer(ip6n->tnls_wc[0], t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001443 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444}
1445
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001446static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001447 .handler = ip4ip6_rcv,
1448 .err_handler = ip4ip6_err,
1449 .priority = 1,
1450};
1451
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001452static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
Patrick McHardy03037702005-07-19 14:03:34 -07001453 .handler = ip6ip6_rcv,
1454 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08001455 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456};
1457
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001458static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001459{
1460 int h;
1461 struct ip6_tnl *t;
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001462 LIST_HEAD(list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001463
1464 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet94767632010-09-15 20:25:34 +00001465 t = rtnl_dereference(ip6n->tnls_r_l[h]);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001466 while (t != NULL) {
1467 unregister_netdevice_queue(t->dev, &list);
Eric Dumazet94767632010-09-15 20:25:34 +00001468 t = rtnl_dereference(t->next);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001469 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001470 }
1471
Eric Dumazet94767632010-09-15 20:25:34 +00001472 t = rtnl_dereference(ip6n->tnls_wc[0]);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001473 unregister_netdevice_queue(t->dev, &list);
1474 unregister_netdevice_many(&list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001475}
1476
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001477static int __net_init ip6_tnl_init_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001478{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001479 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001480 int err;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001481
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001482 ip6n->tnls[0] = ip6n->tnls_wc;
1483 ip6n->tnls[1] = ip6n->tnls_r_l;
1484
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001485 err = -ENOMEM;
1486 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1487 ip6_tnl_dev_setup);
1488
1489 if (!ip6n->fb_tnl_dev)
1490 goto err_alloc_dev;
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001491 dev_net_set(ip6n->fb_tnl_dev, net);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001492
Eric Dumazet8560f222010-09-28 03:23:34 +00001493 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1494 if (err < 0)
1495 goto err_register;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001496
1497 err = register_netdev(ip6n->fb_tnl_dev);
1498 if (err < 0)
1499 goto err_register;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001500 return 0;
1501
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001502err_register:
Eric Dumazet8560f222010-09-28 03:23:34 +00001503 ip6_dev_free(ip6n->fb_tnl_dev);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001504err_alloc_dev:
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001505 return err;
1506}
1507
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001508static void __net_exit ip6_tnl_exit_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001509{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001510 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001511
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001512 rtnl_lock();
1513 ip6_tnl_destroy_tunnels(ip6n);
1514 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001515}
1516
1517static struct pernet_operations ip6_tnl_net_ops = {
1518 .init = ip6_tnl_init_net,
1519 .exit = ip6_tnl_exit_net,
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001520 .id = &ip6_tnl_net_id,
1521 .size = sizeof(struct ip6_tnl_net),
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001522};
1523
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524/**
1525 * ip6_tunnel_init - register protocol and reserve needed resources
1526 *
1527 * Return: 0 on success
1528 **/
1529
1530static int __init ip6_tunnel_init(void)
1531{
1532 int err;
1533
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001534 err = register_pernet_device(&ip6_tnl_net_ops);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001535 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001536 goto out_pernet;
1537
1538 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1539 if (err < 0) {
1540 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
1541 goto out_ip4ip6;
1542 }
1543
1544 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1545 if (err < 0) {
1546 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
1547 goto out_ip6ip6;
1548 }
1549
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 return 0;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001551
1552out_ip6ip6:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001553 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001554out_ip4ip6:
1555 unregister_pernet_device(&ip6_tnl_net_ops);
1556out_pernet:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 return err;
1558}
1559
1560/**
1561 * ip6_tunnel_cleanup - free resources and unregister protocol
1562 **/
1563
1564static void __exit ip6_tunnel_cleanup(void)
1565{
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001566 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001567 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001568
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001569 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001570 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001572 unregister_pernet_device(&ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573}
1574
1575module_init(ip6_tunnel_init);
1576module_exit(ip6_tunnel_cleanup);