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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09002 * IPv6 tunneling device
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Linux INET6 implementation
4 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Ville Nuorvala <vnuorval@tcs.hut.fi>
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09007 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Based on:
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +090010 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 * RFC 2473
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
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 Kozakaic4d3efa2007-02-15 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>
Arun Sharma60063492011-07-26 16:09:06 -070043#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Yasuyuki Kozakaic4d3efa2007-02-15 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 Kozakaic4d3efa2007-02-15 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 Kozakaic4d3efa2007-02-15 00:43:16 +090069#define IPV6_TCLASS_SHIFT 20
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71#define HASH_SIZE 32
72
Al Viroe69a4ad2006-11-14 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 Emelyanov15820e12008-04-16 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;
Eric Dumazet8ce120f2011-11-04 23:19:28 +000096} __attribute__((aligned(4*sizeof(unsigned long))));
Eric Dumazet8560f222010-09-28 03:23:34 +000097
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 Dumazetcf778b02012-01-12 04:41:32 +0000221 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
222 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) {
Eric Dumazetcf778b02012-01-12 04:41:32 +0000240 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 Emelyanovb37d4282008-02-26 23:51:04 -0800289 if ((err = register_netdevice(dev)) < 0)
290 goto failed_free;
291
Josh Boyer731abb92011-11-10 15:10:23 +0000292 strcpy(t->parms.name, dev->name);
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 dev_hold(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700295 ip6_tnl_link(ip6n, t);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800296 return t;
Pavel Emelyanovb37d4282008-02-26 23:51:04 -0800297
298failed_free:
Eric Dumazet8560f222010-09-28 03:23:34 +0000299 ip6_dev_free(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800300failed:
301 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302}
303
304/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900305 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900306 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 * @create: != 0 if allowed to create new tunnel if no match found
308 *
309 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900310 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 * based on @parms. If this is unsuccessful, but @create is set a new
312 * tunnel device is created and registered for use.
313 *
314 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800315 * matching tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 **/
317
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700318static struct ip6_tnl *ip6_tnl_locate(struct net *net,
319 struct ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000321 const struct in6_addr *remote = &p->raddr;
322 const struct in6_addr *local = &p->laddr;
Eric Dumazet94767632010-09-15 20:25:34 +0000323 struct ip6_tnl __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700325 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Eric Dumazet94767632010-09-15 20:25:34 +0000327 for (tp = ip6_tnl_bucket(ip6n, p);
328 (t = rtnl_dereference(*tp)) != NULL;
329 tp = &t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Ville Nuorvala567131a2006-11-24 17:05:41 -0800331 ipv6_addr_equal(remote, &t->parms.raddr))
332 return t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 }
334 if (!create)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800335 return NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700336 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337}
338
339/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900340 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900342 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900344 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 **/
346
347static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900348ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349{
Patrick McHardy2941a482006-01-08 22:05:26 -0800350 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700351 struct net *net = dev_net(dev);
352 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Eric Dumazet94767632010-09-15 20:25:34 +0000354 if (dev == ip6n->fb_tnl_dev)
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000355 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
Eric Dumazet94767632010-09-15 20:25:34 +0000356 else
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700357 ip6_tnl_unlink(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 ip6_tnl_dst_reset(t);
359 dev_put(dev);
360}
361
362/**
363 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
364 * @skb: received socket buffer
365 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900366 * Return:
367 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 * else index to encapsulation limit
369 **/
370
371static __u16
372parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
373{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000374 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 __u8 nexthdr = ipv6h->nexthdr;
376 __u16 off = sizeof (*ipv6h);
377
378 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
379 __u16 optlen = 0;
380 struct ipv6_opt_hdr *hdr;
381 if (raw + off + sizeof (*hdr) > skb->data &&
382 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
383 break;
384
385 hdr = (struct ipv6_opt_hdr *) (raw + off);
386 if (nexthdr == NEXTHDR_FRAGMENT) {
387 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
388 if (frag_hdr->frag_off)
389 break;
390 optlen = 8;
391 } else if (nexthdr == NEXTHDR_AUTH) {
392 optlen = (hdr->hdrlen + 2) << 2;
393 } else {
394 optlen = ipv6_optlen(hdr);
395 }
396 if (nexthdr == NEXTHDR_DEST) {
397 __u16 i = off + 2;
398 while (1) {
399 struct ipv6_tlv_tnl_enc_lim *tel;
400
401 /* No more room for encapsulation limit */
402 if (i + sizeof (*tel) > off + optlen)
403 break;
404
405 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
406 /* return index of option if found and valid */
407 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
408 tel->length == 1)
409 return i;
410 /* else jump to next option */
411 if (tel->type)
412 i += tel->length + 2;
413 else
414 i++;
415 }
416 }
417 nexthdr = hdr->nexthdr;
418 off += optlen;
419 }
420 return 0;
421}
422
423/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900424 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 *
426 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900427 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 * to the specifications in RFC 2473.
429 **/
430
Herbert Xud2acc342006-03-28 01:12:13 -0800431static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900432ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700433 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000435 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 struct ip6_tnl *t;
437 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700438 u8 rel_type = ICMPV6_DEST_UNREACH;
439 u8 rel_code = ICMPV6_ADDR_UNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 __u32 rel_info = 0;
441 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800442 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900444 /* If the packet doesn't contain the original IPv6 header we are
445 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 processing of the error. */
447
Eric Dumazet2922bc82009-10-23 06:34:34 +0000448 rcu_read_lock();
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700449 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700450 &ipv6h->saddr)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 goto out;
452
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900453 if (t->parms.proto != ipproto && t->parms.proto != 0)
454 goto out;
455
Herbert Xud2acc342006-03-28 01:12:13 -0800456 err = 0;
457
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900458 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 __u32 teli;
460 struct ipv6_tlv_tnl_enc_lim *tel;
461 __u32 mtu;
462 case ICMPV6_DEST_UNREACH:
463 if (net_ratelimit())
464 printk(KERN_WARNING
465 "%s: Path to destination invalid "
466 "or inactive!\n", t->parms.name);
467 rel_msg = 1;
468 break;
469 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900470 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 if (net_ratelimit())
472 printk(KERN_WARNING
473 "%s: Too small hop limit or "
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900474 "routing loop in tunnel!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 t->parms.name);
476 rel_msg = 1;
477 }
478 break;
479 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800480 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900481 if ((*code) == ICMPV6_HDR_FIELD)
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800482 teli = parse_tlv_tnl_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
Al Viro704eae12007-07-26 17:33:29 +0100484 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
486 if (tel->encap_limit == 0) {
487 if (net_ratelimit())
488 printk(KERN_WARNING
489 "%s: Too small encapsulation "
490 "limit or routing loop in "
491 "tunnel!\n", t->parms.name);
492 rel_msg = 1;
493 }
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800494 } else if (net_ratelimit()) {
495 printk(KERN_WARNING
496 "%s: Recipient unable to parse tunneled "
497 "packet!\n ", t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 }
499 break;
500 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100501 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 if (mtu < IPV6_MIN_MTU)
503 mtu = IPV6_MIN_MTU;
504 t->dev->mtu = mtu;
505
Al Virocc6cdac2006-02-18 16:02:18 -0500506 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 rel_type = ICMPV6_PKT_TOOBIG;
508 rel_code = 0;
509 rel_info = mtu;
510 rel_msg = 1;
511 }
512 break;
513 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900514
515 *type = rel_type;
516 *code = rel_code;
517 *info = rel_info;
518 *msg = rel_msg;
519
520out:
Eric Dumazet2922bc82009-10-23 06:34:34 +0000521 rcu_read_unlock();
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900522 return err;
523}
524
525static int
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900526ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700527 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900528{
529 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700530 u8 rel_type = type;
531 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100532 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900533 int err;
534 struct sk_buff *skb2;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000535 const struct iphdr *eiph;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900536 struct rtable *rt;
David S. Miller31e45432011-05-03 20:25:42 -0700537 struct flowi4 fl4;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900538
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900539 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
540 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900541 if (err < 0)
542 return err;
543
544 if (rel_msg == 0)
545 return 0;
546
547 switch (rel_type) {
548 case ICMPV6_DEST_UNREACH:
549 if (rel_code != ICMPV6_ADDR_UNREACH)
550 return 0;
551 rel_type = ICMP_DEST_UNREACH;
552 rel_code = ICMP_HOST_UNREACH;
553 break;
554 case ICMPV6_PKT_TOOBIG:
555 if (rel_code != 0)
556 return 0;
557 rel_type = ICMP_DEST_UNREACH;
558 rel_code = ICMP_FRAG_NEEDED;
559 break;
560 default:
561 return 0;
562 }
563
564 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
565 return 0;
566
567 skb2 = skb_clone(skb, GFP_ATOMIC);
568 if (!skb2)
569 return 0;
570
Eric Dumazetadf30902009-06-02 05:19:30 +0000571 skb_dst_drop(skb2);
572
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900573 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700574 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700575 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900576
577 /* Try to guess incoming interface */
David S. Miller31e45432011-05-03 20:25:42 -0700578 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500579 eiph->saddr, 0,
580 0, 0,
581 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800582 if (IS_ERR(rt))
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900583 goto out;
584
Changli Gaod8d1f302010-06-10 23:31:35 -0700585 skb2->dev = rt->dst.dev;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900586
587 /* route "incoming" packet */
588 if (rt->rt_flags & RTCF_LOCAL) {
589 ip_rt_put(rt);
590 rt = NULL;
David S. Miller31e45432011-05-03 20:25:42 -0700591 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500592 eiph->daddr, eiph->saddr,
593 0, 0,
594 IPPROTO_IPIP,
595 RT_TOS(eiph->tos), 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800596 if (IS_ERR(rt) ||
Changli Gaod8d1f302010-06-10 23:31:35 -0700597 rt->dst.dev->type != ARPHRD_TUNNEL) {
David S. Millerb23dd4f2011-03-02 14:31:35 -0800598 if (!IS_ERR(rt))
599 ip_rt_put(rt);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900600 goto out;
601 }
David S. Millerb23dd4f2011-03-02 14:31:35 -0800602 skb_dst_set(skb2, &rt->dst);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900603 } else {
604 ip_rt_put(rt);
605 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
606 skb2->dev) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000607 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900608 goto out;
609 }
610
611 /* change mtu on this route */
612 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000613 if (rel_info > dst_mtu(skb_dst(skb2)))
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900614 goto out;
615
Eric Dumazetadf30902009-06-02 05:19:30 +0000616 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900617 }
618
Al Viro704eae12007-07-26 17:33:29 +0100619 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900620
621out:
622 kfree_skb(skb2);
623 return 0;
624}
625
626static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900627ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700628 u8 type, u8 code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900629{
630 int rel_msg = 0;
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700631 u8 rel_type = type;
632 u8 rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100633 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900634 int err;
635
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900636 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
637 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900638 if (err < 0)
639 return err;
640
641 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 struct rt6_info *rt;
643 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800644
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900646 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
Eric Dumazetadf30902009-06-02 05:19:30 +0000648 skb_dst_drop(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700650 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
652 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700653 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
654 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
David S. Millerd1918542011-12-28 20:19:20 -0500656 if (rt && rt->dst.dev)
657 skb2->dev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000659 icmpv6_send(skb2, rel_type, rel_code, rel_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
661 if (rt)
Changli Gaod8d1f302010-06-10 23:31:35 -0700662 dst_release(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
664 kfree_skb(skb2);
665 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900666
667 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668}
669
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000670static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
671 const struct ipv6hdr *ipv6h,
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900672 struct sk_buff *skb)
673{
674 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
675
676 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700677 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900678
679 if (INET_ECN_is_ce(dsfield))
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700680 IP_ECN_set_ce(ip_hdr(skb));
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900681}
682
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000683static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
684 const struct ipv6hdr *ipv6h,
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900685 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900687 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b2007-11-13 21:40:13 -0800688 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900690 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700691 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900693
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100694/* called with rcu_read_lock() */
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800695static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
696{
697 struct ip6_tnl_parm *p = &t->parms;
698 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700699 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800700
701 if (p->flags & IP6_TNL_F_CAP_RCV) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900702 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800703
704 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100705 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800706
707 if ((ipv6_addr_is_multicast(&p->laddr) ||
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700708 likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
709 likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800710 ret = 1;
711
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800712 }
713 return ret;
714}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
716/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900717 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 * @skb: received socket buffer
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900719 * @protocol: ethernet protocol ID
720 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 *
722 * Return: 0
723 **/
724
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900725static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900726 __u8 ipproto,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000727 void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
728 const struct ipv6hdr *ipv6h,
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900729 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 struct ip6_tnl *t;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000732 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Eric Dumazet2922bc82009-10-23 06:34:34 +0000734 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700736 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700737 &ipv6h->daddr)) != NULL) {
Eric Dumazet8560f222010-09-28 03:23:34 +0000738 struct pcpu_tstats *tstats;
739
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900740 if (t->parms.proto != ipproto && t->parms.proto != 0) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000741 rcu_read_unlock();
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900742 goto discard;
743 }
744
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Eric Dumazet2922bc82009-10-23 06:34:34 +0000746 rcu_read_unlock();
Herbert Xu50fba2a2006-04-04 13:50:45 -0700747 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 }
749
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800750 if (!ip6_tnl_rcv_ctl(t)) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700751 t->dev->stats.rx_dropped++;
Eric Dumazet2922bc82009-10-23 06:34:34 +0000752 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 goto discard;
754 }
755 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700756 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700757 skb_reset_network_header(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900758 skb->protocol = htons(protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 skb->pkt_type = PACKET_HOST;
760 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700761
Eric Dumazet8560f222010-09-28 03:23:34 +0000762 tstats = this_cpu_ptr(t->dev->tstats);
763 tstats->rx_packets++;
764 tstats->rx_bytes += skb->len;
765
766 __skb_tunnel_rx(skb, t->dev);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900767
768 dscp_ecn_decapsulate(t, ipv6h, skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000769
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000770 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000771
Eric Dumazet2922bc82009-10-23 06:34:34 +0000772 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 return 0;
774 }
Eric Dumazet2922bc82009-10-23 06:34:34 +0000775 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 return 1;
Herbert Xu50fba2a2006-04-04 13:50:45 -0700777
778discard:
779 kfree_skb(skb);
780 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781}
782
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900783static int ip4ip6_rcv(struct sk_buff *skb)
784{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900785 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
786 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900787}
788
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900789static int ip6ip6_rcv(struct sk_buff *skb)
790{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900791 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
792 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900793}
794
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800795struct ipv6_tel_txoption {
796 struct ipv6_txoptions ops;
797 __u8 dst_opt[8];
798};
799
800static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800802 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800804 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
805 opt->dst_opt[3] = 1;
806 opt->dst_opt[4] = encap_limit;
807 opt->dst_opt[5] = IPV6_TLV_PADN;
808 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800810 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
811 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812}
813
814/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900815 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900817 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 *
819 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900820 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 * doesn't match source of incoming packet.
822 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900823 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 * 1 if conflict,
825 * 0 else
826 **/
827
828static inline int
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000829ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830{
831 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
832}
833
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800834static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
835{
836 struct ip6_tnl_parm *p = &t->parms;
837 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700838 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800839
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900840 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800841 struct net_device *ldev = NULL;
842
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100843 rcu_read_lock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800844 if (p->link)
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100845 ldev = dev_get_by_index_rcu(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800846
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700847 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800848 printk(KERN_WARNING
849 "%s xmit: Local address not yet configured!\n",
850 p->name);
851 else if (!ipv6_addr_is_multicast(&p->raddr) &&
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700852 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800853 printk(KERN_WARNING
854 "%s xmit: Routing loop! "
855 "Remote address found on this node!\n",
856 p->name);
857 else
858 ret = 1;
Eric Dumazetf1a28ea2009-11-02 11:21:37 +0100859 rcu_read_unlock();
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800860 }
861 return ret;
862}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863/**
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900864 * ip6_tnl_xmit2 - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900866 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900867 * @dsfield: dscp code for outer header
868 * @fl: flow of tunneled packet
869 * @encap_limit: encapsulation limit
870 * @pmtu: Path MTU is stored if packet is too big
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 *
872 * Description:
873 * Build new header and do some sanity checks on the packet before sending
874 * it.
875 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900876 * Return:
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +0900877 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900878 * -1 fail
879 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 **/
881
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900882static int ip6_tnl_xmit2(struct sk_buff *skb,
883 struct net_device *dev,
884 __u8 dsfield,
David S. Miller4c9483b2011-03-12 16:22:43 -0500885 struct flowi6 *fl6,
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900886 int encap_limit,
887 __u32 *pmtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888{
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800889 struct net *net = dev_net(dev);
Patrick McHardy2941a482006-01-08 22:05:26 -0800890 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700891 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700892 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800893 struct ipv6_tel_txoption opt;
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400894 struct dst_entry *dst = NULL, *ndst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 struct net_device *tdev;
896 int mtu;
Chuck Leverc2636b42007-10-23 21:07:32 -0700897 unsigned int max_headroom = sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 u8 proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900899 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 int pkt_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400902 if (!fl6->flowi6_mark)
903 dst = ip6_tnl_dst_check(t);
Eric Dumazet89b02122011-07-28 04:32:25 +0000904 if (!dst) {
905 ndst = ip6_route_output(net, NULL, fl6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
Eric Dumazet89b02122011-07-28 04:32:25 +0000907 if (ndst->error)
Patrick McHardya57ebc92005-09-08 14:27:47 -0700908 goto tx_err_link_failure;
Eric Dumazet89b02122011-07-28 04:32:25 +0000909 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
910 if (IS_ERR(ndst)) {
911 err = PTR_ERR(ndst);
912 ndst = NULL;
David S. Miller452edd52011-03-02 13:27:41 -0800913 goto tx_err_link_failure;
914 }
Eric Dumazet89b02122011-07-28 04:32:25 +0000915 dst = ndst;
Patrick McHardya57ebc92005-09-08 14:27:47 -0700916 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
918 tdev = dst->dev;
919
920 if (tdev == dev) {
921 stats->collisions++;
922 if (net_ratelimit())
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900923 printk(KERN_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 "%s: Local routing loop detected!\n",
925 t->parms.name);
926 goto tx_err_dst_release;
927 }
928 mtu = dst_mtu(dst) - sizeof (*ipv6h);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800929 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 max_headroom += 8;
931 mtu -= 8;
932 }
933 if (mtu < IPV6_MIN_MTU)
934 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +0000935 if (skb_dst(skb))
936 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 if (skb->len > mtu) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900938 *pmtu = mtu;
939 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 goto tx_err_dst_release;
941 }
942
943 /*
944 * Okay, now see if we can stuff it in the buffer as-is.
945 */
946 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900947
Patrick McHardycfbba492007-07-09 15:33:40 -0700948 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
949 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900951
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
953 goto tx_err_dst_release;
954
955 if (skb->sk)
956 skb_set_owner_w(new_skb, skb->sk);
957 kfree_skb(skb);
958 skb = new_skb;
959 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000960 skb_dst_drop(skb);
Eric Dumazetd24f22f2011-09-20 14:50:00 -0400961 if (fl6->flowi6_mark) {
962 skb_dst_set(skb, dst);
963 ndst = NULL;
964 } else {
965 skb_dst_set_noref(skb, dst);
966 }
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700967 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
David S. Miller4c9483b2011-03-12 16:22:43 -0500969 proto = fl6->flowi6_proto;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800970 if (encap_limit >= 0) {
971 init_tel_txopt(&opt, encap_limit);
972 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
973 }
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700974 skb_push(skb, sizeof(struct ipv6hdr));
975 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700976 ipv6h = ipv6_hdr(skb);
David S. Miller4c9483b2011-03-12 16:22:43 -0500977 *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 dsfield = INET_ECN_encapsulate(0, dsfield);
979 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 ipv6h->hop_limit = t->parms.hop_limit;
981 ipv6h->nexthdr = proto;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000982 ipv6h->saddr = fl6->saddr;
983 ipv6h->daddr = fl6->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 nf_reset(skb);
985 pkt_len = skb->len;
Herbert Xuef76bc22008-01-11 19:15:08 -0800986 err = ip6_local_out(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200988 if (net_xmit_eval(err) == 0) {
Eric Dumazet8560f222010-09-28 03:23:34 +0000989 struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats);
990
991 tstats->tx_bytes += pkt_len;
992 tstats->tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 } else {
994 stats->tx_errors++;
995 stats->tx_aborted_errors++;
996 }
Eric Dumazet89b02122011-07-28 04:32:25 +0000997 if (ndst)
998 ip6_tnl_dst_store(t, ndst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 return 0;
1000tx_err_link_failure:
1001 stats->tx_carrier_errors++;
1002 dst_link_failure(skb);
1003tx_err_dst_release:
Eric Dumazet89b02122011-07-28 04:32:25 +00001004 dst_release(ndst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001005 return err;
1006}
1007
1008static inline int
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001009ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1010{
1011 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001012 const struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001013 int encap_limit = -1;
David S. Miller4c9483b2011-03-12 16:22:43 -05001014 struct flowi6 fl6;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001015 __u8 dsfield;
1016 __u32 mtu;
1017 int err;
1018
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001019 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1020 !ip6_tnl_xmit_ctl(t))
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001021 return -1;
1022
1023 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1024 encap_limit = t->parms.encap_limit;
1025
David S. Miller4c9483b2011-03-12 16:22:43 -05001026 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1027 fl6.flowi6_proto = IPPROTO_IPIP;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001028
1029 dsfield = ipv4_get_dsfield(iph);
1030
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001031 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001032 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
Al Virob77f2fa2007-07-21 19:09:41 -07001033 & IPV6_TCLASS_MASK;
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001034 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1035 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001036
David S. Miller4c9483b2011-03-12 16:22:43 -05001037 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001038 if (err != 0) {
1039 /* XXX: send ICMP error even if DF is not set. */
1040 if (err == -EMSGSIZE)
1041 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1042 htonl(mtu));
1043 return -1;
1044 }
1045
1046 return 0;
1047}
1048
1049static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001050ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1051{
1052 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001053 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001054 int encap_limit = -1;
1055 __u16 offset;
David S. Miller4c9483b2011-03-12 16:22:43 -05001056 struct flowi6 fl6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001057 __u8 dsfield;
1058 __u32 mtu;
1059 int err;
1060
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001061 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1062 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001063 return -1;
1064
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001065 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
1066 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001067 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001068 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001069 if (tel->encap_limit == 0) {
1070 icmpv6_send(skb, ICMPV6_PARAMPROB,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001071 ICMPV6_HDR_FIELD, offset + 2);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001072 return -1;
1073 }
1074 encap_limit = tel->encap_limit - 1;
1075 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1076 encap_limit = t->parms.encap_limit;
1077
David S. Miller4c9483b2011-03-12 16:22:43 -05001078 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1079 fl6.flowi6_proto = IPPROTO_IPV6;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001080
1081 dsfield = ipv6_get_dsfield(ipv6h);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001082 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
David S. Miller4c9483b2011-03-12 16:22:43 -05001083 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001084 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
David S. Miller4c9483b2011-03-12 16:22:43 -05001085 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
Eric Dumazetd24f22f2011-09-20 14:50:00 -04001086 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1087 fl6.flowi6_mark = skb->mark;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001088
David S. Miller4c9483b2011-03-12 16:22:43 -05001089 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001090 if (err != 0) {
1091 if (err == -EMSGSIZE)
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +00001092 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001093 return -1;
1094 }
1095
1096 return 0;
1097}
1098
Stephen Hemminger6fef4c02009-08-31 19:50:41 +00001099static netdev_tx_t
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001100ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1101{
1102 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001103 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001104 int ret;
1105
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001106 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001107 case htons(ETH_P_IP):
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001108 ret = ip4ip6_tnl_xmit(skb, dev);
1109 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -07001110 case htons(ETH_P_IPV6):
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001111 ret = ip6ip6_tnl_xmit(skb, dev);
1112 break;
1113 default:
1114 goto tx_err;
1115 }
1116
1117 if (ret < 0)
1118 goto tx_err;
1119
Patrick McHardy6ed10652009-06-23 06:03:08 +00001120 return NETDEV_TX_OK;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001121
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122tx_err:
1123 stats->tx_errors++;
1124 stats->tx_dropped++;
1125 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +00001126 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127}
1128
1129static void ip6_tnl_set_cap(struct ip6_tnl *t)
1130{
1131 struct ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001132 int ltype = ipv6_addr_type(&p->laddr);
1133 int rtype = ipv6_addr_type(&p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134
1135 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
1136
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001137 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1138 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1139 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001140 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001141 if (ltype&IPV6_ADDR_UNICAST)
1142 p->flags |= IP6_TNL_F_CAP_XMIT;
1143 if (rtype&IPV6_ADDR_UNICAST)
1144 p->flags |= IP6_TNL_F_CAP_RCV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 }
1146}
1147
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001148static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149{
1150 struct net_device *dev = t->dev;
1151 struct ip6_tnl_parm *p = &t->parms;
David S. Miller4c9483b2011-03-12 16:22:43 -05001152 struct flowi6 *fl6 = &t->fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
Jiri Pirko3a6d54c2009-05-11 23:37:15 +00001154 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1155 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156
1157 /* Set up flowi template */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001158 fl6->saddr = p->laddr;
1159 fl6->daddr = p->raddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001160 fl6->flowi6_oif = p->link;
1161 fl6->flowlabel = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
1163 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
David S. Miller4c9483b2011-03-12 16:22:43 -05001164 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
David S. Miller4c9483b2011-03-12 16:22:43 -05001166 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
1168 ip6_tnl_set_cap(t);
1169
1170 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1171 dev->flags |= IFF_POINTOPOINT;
1172 else
1173 dev->flags &= ~IFF_POINTOPOINT;
1174
1175 dev->iflink = p->link;
1176
1177 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001178 int strict = (ipv6_addr_type(&p->raddr) &
1179 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1180
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001181 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1182 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001183 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184
1185 if (rt == NULL)
1186 return;
1187
David S. Millerd1918542011-12-28 20:19:20 -05001188 if (rt->dst.dev) {
1189 dev->hard_header_len = rt->dst.dev->hard_header_len +
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 sizeof (struct ipv6hdr);
1191
David S. Millerd1918542011-12-28 20:19:20 -05001192 dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001193 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1194 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
1196 if (dev->mtu < IPV6_MIN_MTU)
1197 dev->mtu = IPV6_MIN_MTU;
1198 }
Changli Gaod8d1f302010-06-10 23:31:35 -07001199 dst_release(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 }
1201}
1202
1203/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001204 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 * @t: tunnel to be changed
1206 * @p: tunnel configuration parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 *
1208 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001209 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 **/
1211
1212static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001213ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214{
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001215 t->parms.laddr = p->laddr;
1216 t->parms.raddr = p->raddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 t->parms.flags = p->flags;
1218 t->parms.hop_limit = p->hop_limit;
1219 t->parms.encap_limit = p->encap_limit;
1220 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001221 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001222 t->parms.proto = p->proto;
Hugo Santos0c088892006-02-24 13:16:25 -08001223 ip6_tnl_dst_reset(t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001224 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 return 0;
1226}
1227
1228/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001229 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 * @dev: virtual device associated with tunnel
1231 * @ifr: parameters passed from userspace
1232 * @cmd: command to be performed
1233 *
1234 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001235 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001236 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 *
1238 * The possible commands are the following:
1239 * %SIOCGETTUNNEL: get tunnel parameters for device
1240 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1241 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1242 * %SIOCDELTUNNEL: delete tunnel
1243 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001244 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 * initialization, can be used for creating other tunnel devices.
1246 *
1247 * Return:
1248 * 0 on success,
1249 * %-EFAULT if unable to copy data to or from userspace,
1250 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1251 * %-EINVAL if passed tunnel parameters are invalid,
1252 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1253 * %-ENODEV if attempting to change or delete a nonexisting device
1254 **/
1255
1256static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001257ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258{
1259 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 struct ip6_tnl_parm p;
1261 struct ip6_tnl *t = NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001262 struct net *net = dev_net(dev);
1263 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264
1265 switch (cmd) {
1266 case SIOCGETTUNNEL:
Pavel Emelyanov15820e12008-04-16 01:23:02 -07001267 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001268 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 err = -EFAULT;
1270 break;
1271 }
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001272 t = ip6_tnl_locate(net, &p, 0);
Ville Nuorvala567131a2006-11-24 17:05:41 -08001273 }
1274 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -08001275 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 memcpy(&p, &t->parms, sizeof (p));
1277 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1278 err = -EFAULT;
1279 }
1280 break;
1281 case SIOCADDTUNNEL:
1282 case SIOCCHGTUNNEL:
1283 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 if (!capable(CAP_NET_ADMIN))
1285 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001286 err = -EFAULT;
1287 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001289 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001290 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1291 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 break;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001293 t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
Pavel Emelyanov15820e12008-04-16 01:23:02 -07001294 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001295 if (t != NULL) {
1296 if (t->dev != dev) {
1297 err = -EEXIST;
1298 break;
1299 }
1300 } else
1301 t = netdev_priv(dev);
1302
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001303 ip6_tnl_unlink(ip6n, t);
Pavel Emelyanov74b0b852010-10-27 05:43:53 +00001304 synchronize_net();
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001305 err = ip6_tnl_change(t, &p);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001306 ip6_tnl_link(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 netdev_state_change(dev);
1308 }
Ville Nuorvala567131a2006-11-24 17:05:41 -08001309 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 err = 0;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001311 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
1312 err = -EFAULT;
1313
1314 } else
1315 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 break;
1317 case SIOCDELTUNNEL:
1318 err = -EPERM;
1319 if (!capable(CAP_NET_ADMIN))
1320 break;
1321
Pavel Emelyanov15820e12008-04-16 01:23:02 -07001322 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001323 err = -EFAULT;
1324 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001326 err = -ENOENT;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001327 if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001329 err = -EPERM;
Pavel Emelyanov15820e12008-04-16 01:23:02 -07001330 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001332 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001334 err = 0;
1335 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 break;
1337 default:
1338 err = -EINVAL;
1339 }
1340 return err;
1341}
1342
1343/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001344 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 * @dev: virtual device associated with tunnel
1346 * @new_mtu: the new mtu
1347 *
1348 * Return:
1349 * 0 on success,
1350 * %-EINVAL if mtu too small
1351 **/
1352
1353static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001354ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355{
1356 if (new_mtu < IPV6_MIN_MTU) {
1357 return -EINVAL;
1358 }
1359 dev->mtu = new_mtu;
1360 return 0;
1361}
1362
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001363
1364static const struct net_device_ops ip6_tnl_netdev_ops = {
Eric Dumazet8560f222010-09-28 03:23:34 +00001365 .ndo_uninit = ip6_tnl_dev_uninit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001366 .ndo_start_xmit = ip6_tnl_xmit,
Eric Dumazet8560f222010-09-28 03:23:34 +00001367 .ndo_do_ioctl = ip6_tnl_ioctl,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001368 .ndo_change_mtu = ip6_tnl_change_mtu,
Eric Dumazet8560f222010-09-28 03:23:34 +00001369 .ndo_get_stats = ip6_get_stats,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001370};
1371
Eric Dumazet8560f222010-09-28 03:23:34 +00001372
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001374 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 * @dev: virtual device associated with tunnel
1376 *
1377 * Description:
1378 * Initialize function pointers and device parameters
1379 **/
1380
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001381static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382{
Anders Franzen381601e2010-11-24 05:47:18 +00001383 struct ip6_tnl *t;
1384
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001385 dev->netdev_ops = &ip6_tnl_netdev_ops;
Eric Dumazet8560f222010-09-28 03:23:34 +00001386 dev->destructor = ip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
1388 dev->type = ARPHRD_TUNNEL6;
1389 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1390 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
Anders Franzen381601e2010-11-24 05:47:18 +00001391 t = netdev_priv(dev);
1392 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1393 dev->mtu-=8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 dev->flags |= IFF_NOARP;
1395 dev->addr_len = sizeof(struct in6_addr);
Pavel Emelyanov554eb272008-04-16 01:24:13 -07001396 dev->features |= NETIF_F_NETNS_LOCAL;
Anders Franzen7e223de2010-10-19 03:50:47 +00001397 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398}
1399
1400
1401/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001402 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 * @dev: virtual device associated with tunnel
1404 **/
1405
Eric Dumazet8560f222010-09-28 03:23:34 +00001406static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001407ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408{
Patrick McHardy2941a482006-01-08 22:05:26 -08001409 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001410
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 t->dev = dev;
Eric Dumazet8560f222010-09-28 03:23:34 +00001412 dev->tstats = alloc_percpu(struct pcpu_tstats);
1413 if (!dev->tstats)
1414 return -ENOMEM;
1415 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416}
1417
1418/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001419 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 * @dev: virtual device associated with tunnel
1421 **/
1422
Eric Dumazet8560f222010-09-28 03:23:34 +00001423static int ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424{
Patrick McHardy2941a482006-01-08 22:05:26 -08001425 struct ip6_tnl *t = netdev_priv(dev);
Eric Dumazet8560f222010-09-28 03:23:34 +00001426 int err = ip6_tnl_dev_init_gen(dev);
1427
1428 if (err)
1429 return err;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001430 ip6_tnl_link_config(t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001431 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432}
1433
1434/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001435 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 * @dev: fallback device
1437 *
1438 * Return: 0
1439 **/
1440
Eric Dumazet8560f222010-09-28 03:23:34 +00001441static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442{
Patrick McHardy2941a482006-01-08 22:05:26 -08001443 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001444 struct net *net = dev_net(dev);
1445 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Eric Dumazet8560f222010-09-28 03:23:34 +00001446 int err = ip6_tnl_dev_init_gen(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001447
Eric Dumazet8560f222010-09-28 03:23:34 +00001448 if (err)
1449 return err;
1450
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001451 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 dev_hold(dev);
Eric Dumazetcf778b02012-01-12 04:41:32 +00001453 rcu_assign_pointer(ip6n->tnls_wc[0], t);
Eric Dumazet8560f222010-09-28 03:23:34 +00001454 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455}
1456
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001457static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001458 .handler = ip4ip6_rcv,
1459 .err_handler = ip4ip6_err,
1460 .priority = 1,
1461};
1462
Eric Dumazet3ff2cfa2010-08-30 10:27:10 +00001463static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
Patrick McHardy03037702005-07-19 14:03:34 -07001464 .handler = ip6ip6_rcv,
1465 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08001466 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467};
1468
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001469static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001470{
1471 int h;
1472 struct ip6_tnl *t;
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001473 LIST_HEAD(list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001474
1475 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet94767632010-09-15 20:25:34 +00001476 t = rtnl_dereference(ip6n->tnls_r_l[h]);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001477 while (t != NULL) {
1478 unregister_netdevice_queue(t->dev, &list);
Eric Dumazet94767632010-09-15 20:25:34 +00001479 t = rtnl_dereference(t->next);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001480 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001481 }
1482
Eric Dumazet94767632010-09-15 20:25:34 +00001483 t = rtnl_dereference(ip6n->tnls_wc[0]);
Eric Dumazetcf4432f2009-10-28 05:16:51 +00001484 unregister_netdevice_queue(t->dev, &list);
1485 unregister_netdevice_many(&list);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001486}
1487
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001488static int __net_init ip6_tnl_init_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001489{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001490 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Josh Boyer731abb92011-11-10 15:10:23 +00001491 struct ip6_tnl *t = NULL;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001492 int err;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001493
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001494 ip6n->tnls[0] = ip6n->tnls_wc;
1495 ip6n->tnls[1] = ip6n->tnls_r_l;
1496
Pavel Emelyanov15820e12008-04-16 01:23:02 -07001497 err = -ENOMEM;
1498 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1499 ip6_tnl_dev_setup);
1500
1501 if (!ip6n->fb_tnl_dev)
1502 goto err_alloc_dev;
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001503 dev_net_set(ip6n->fb_tnl_dev, net);
Pavel Emelyanov15820e12008-04-16 01:23:02 -07001504
Eric Dumazet8560f222010-09-28 03:23:34 +00001505 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1506 if (err < 0)
1507 goto err_register;
Pavel Emelyanov15820e12008-04-16 01:23:02 -07001508
1509 err = register_netdev(ip6n->fb_tnl_dev);
1510 if (err < 0)
1511 goto err_register;
Josh Boyer731abb92011-11-10 15:10:23 +00001512
1513 t = netdev_priv(ip6n->fb_tnl_dev);
1514
1515 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001516 return 0;
1517
Pavel Emelyanov15820e12008-04-16 01:23:02 -07001518err_register:
Eric Dumazet8560f222010-09-28 03:23:34 +00001519 ip6_dev_free(ip6n->fb_tnl_dev);
Pavel Emelyanov15820e12008-04-16 01:23:02 -07001520err_alloc_dev:
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001521 return err;
1522}
1523
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001524static void __net_exit ip6_tnl_exit_net(struct net *net)
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001525{
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001526 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001527
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001528 rtnl_lock();
1529 ip6_tnl_destroy_tunnels(ip6n);
1530 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001531}
1532
1533static struct pernet_operations ip6_tnl_net_ops = {
1534 .init = ip6_tnl_init_net,
1535 .exit = ip6_tnl_exit_net,
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001536 .id = &ip6_tnl_net_id,
1537 .size = sizeof(struct ip6_tnl_net),
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001538};
1539
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540/**
1541 * ip6_tunnel_init - register protocol and reserve needed resources
1542 *
1543 * Return: 0 on success
1544 **/
1545
1546static int __init ip6_tunnel_init(void)
1547{
1548 int err;
1549
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001550 err = register_pernet_device(&ip6_tnl_net_ops);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001551 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001552 goto out_pernet;
1553
1554 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1555 if (err < 0) {
1556 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
1557 goto out_ip4ip6;
1558 }
1559
1560 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1561 if (err < 0) {
1562 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
1563 goto out_ip6ip6;
1564 }
1565
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 return 0;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001567
1568out_ip6ip6:
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001569 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001570out_ip4ip6:
1571 unregister_pernet_device(&ip6_tnl_net_ops);
1572out_pernet:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 return err;
1574}
1575
1576/**
1577 * ip6_tunnel_cleanup - free resources and unregister protocol
1578 **/
1579
1580static void __exit ip6_tunnel_cleanup(void)
1581{
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001582 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001583 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
Yasuyuki Kozakaic4d3efa2007-02-15 00:43:16 +09001584
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001585 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001586 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587
Eric W. Biedermanac31cd32009-11-29 15:46:15 +00001588 unregister_pernet_device(&ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589}
1590
1591module_init(ip6_tunnel_init);
1592module_exit(ip6_tunnel_cleanup);