blob: b1eea811be48c1f73b3a6e727193a3a04435245e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
3 * Linux INET6 implementation
4 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Changes:
15 * Roger Venning <r.venning@telstra.com>: 6to4 support
16 * Nate Thompson <nate@thebog.net>: 6to4 support
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -040017 * Fred Templin <fred.l.templin@boeing.com>: isatap support
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/module.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080021#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/errno.h>
23#include <linux/types.h>
24#include <linux/socket.h>
25#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/net.h>
27#include <linux/in6.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/icmp.h>
31#include <asm/uaccess.h>
32#include <linux/init.h>
33#include <linux/netfilter_ipv4.h>
Kris Katterjohn46f25df2006-01-05 16:35:42 -080034#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <net/sock.h>
37#include <net/snmp.h>
38
39#include <net/ipv6.h>
40#include <net/protocol.h>
41#include <net/transp_v6.h>
42#include <net/ip6_fib.h>
43#include <net/ip6_route.h>
44#include <net/ndisc.h>
45#include <net/addrconf.h>
46#include <net/ip.h>
47#include <net/udp.h>
48#include <net/icmp.h>
49#include <net/ipip.h>
50#include <net/inet_ecn.h>
51#include <net/xfrm.h>
52#include <net/dsfield.h>
Pavel Emelyanov8190d902008-04-16 01:15:17 -070053#include <net/net_namespace.h>
54#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56/*
57 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
58
59 For comments look at net/ipv4/ip_gre.c --ANK
60 */
61
62#define HASH_SIZE 16
Al Viroe69a4adc2006-11-14 20:56:00 -080063#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Stephen Hemminger1326c3d2008-11-20 20:33:56 -080065static void ipip6_tunnel_init(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066static void ipip6_tunnel_setup(struct net_device *dev);
67
Eric Dumazetf99189b2009-11-17 10:42:49 +000068static int sit_net_id __read_mostly;
Pavel Emelyanov8190d902008-04-16 01:15:17 -070069struct sit_net {
Pavel Emelyanov29182172008-04-16 01:16:38 -070070 struct ip_tunnel *tunnels_r_l[HASH_SIZE];
71 struct ip_tunnel *tunnels_r[HASH_SIZE];
72 struct ip_tunnel *tunnels_l[HASH_SIZE];
73 struct ip_tunnel *tunnels_wc[1];
74 struct ip_tunnel **tunnels[4];
75
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -070076 struct net_device *fb_tunnel_dev;
Pavel Emelyanov8190d902008-04-16 01:15:17 -070077};
78
Eric Dumazet4543c102009-10-23 17:52:14 +000079/*
80 * Locking : hash tables are protected by RCU and a spinlock
81 */
82static DEFINE_SPINLOCK(ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Eric Dumazet4543c102009-10-23 17:52:14 +000084#define for_each_ip_tunnel_rcu(start) \
85 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
86
87/*
88 * Must be invoked with rcu_read_lock
89 */
Pavel Emelyanovca8def12008-04-16 01:15:39 -070090static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +000091 struct net_device *dev, __be32 remote, __be32 local)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092{
93 unsigned h0 = HASH(remote);
94 unsigned h1 = HASH(local);
95 struct ip_tunnel *t;
Pavel Emelyanov29182172008-04-16 01:16:38 -070096 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Eric Dumazet4543c102009-10-23 17:52:14 +000098 for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000100 remote == t->parms.iph.daddr &&
101 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
102 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return t;
104 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000105 for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000106 if (remote == t->parms.iph.daddr &&
107 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
108 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return t;
110 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000111 for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000112 if (local == t->parms.iph.saddr &&
113 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
114 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 return t;
116 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000117 t = rcu_dereference(sitn->tunnels_wc[0]);
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000118 if ((t != NULL) && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 return t;
120 return NULL;
121}
122
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700123static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn,
124 struct ip_tunnel_parm *parms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900126 __be32 remote = parms->iph.daddr;
127 __be32 local = parms->iph.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 unsigned h = 0;
129 int prio = 0;
130
131 if (remote) {
132 prio |= 2;
133 h ^= HASH(remote);
134 }
135 if (local) {
136 prio |= 1;
137 h ^= HASH(local);
138 }
Pavel Emelyanov29182172008-04-16 01:16:38 -0700139 return &sitn->tunnels[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700142static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn,
143 struct ip_tunnel *t)
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900144{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700145 return __ipip6_bucket(sitn, &t->parms);
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900146}
147
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700148static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
150 struct ip_tunnel **tp;
151
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700152 for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 if (t == *tp) {
Eric Dumazet4543c102009-10-23 17:52:14 +0000154 spin_lock_bh(&ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 *tp = t->next;
Eric Dumazet4543c102009-10-23 17:52:14 +0000156 spin_unlock_bh(&ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 break;
158 }
159 }
160}
161
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700162static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700164 struct ip_tunnel **tp = ipip6_bucket(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Eric Dumazet4543c102009-10-23 17:52:14 +0000166 spin_lock_bh(&ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 t->next = *tp;
Eric Dumazet4543c102009-10-23 17:52:14 +0000168 rcu_assign_pointer(*tp, t);
169 spin_unlock_bh(&ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000172static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000173{
174#ifdef CONFIG_IPV6_SIT_6RD
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000175 struct ip_tunnel *t = netdev_priv(dev);
176
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000177 if (t->dev == sitn->fb_tunnel_dev) {
178 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
179 t->ip6rd.relay_prefix = 0;
180 t->ip6rd.prefixlen = 16;
181 t->ip6rd.relay_prefixlen = 0;
182 } else {
183 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
184 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
185 }
186#endif
187}
188
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700189static struct ip_tunnel * ipip6_tunnel_locate(struct net *net,
190 struct ip_tunnel_parm *parms, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
Al Viroe69a4adc2006-11-14 20:56:00 -0800192 __be32 remote = parms->iph.daddr;
193 __be32 local = parms->iph.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 struct ip_tunnel *t, **tp, *nt;
195 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 char name[IFNAMSIZ];
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700197 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700199 for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000200 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000201 remote == t->parms.iph.daddr &&
202 parms->link == t->parms.link) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000203 if (create)
204 return NULL;
205 else
206 return t;
207 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 }
209 if (!create)
210 goto failed;
211
212 if (parms->name[0])
213 strlcpy(name, parms->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800214 else
215 sprintf(name, "sit%%d");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
218 if (dev == NULL)
219 return NULL;
220
Pavel Emelyanov7a971462008-04-16 01:17:18 -0700221 dev_net_set(dev, net);
222
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800223 if (strchr(name, '%')) {
224 if (dev_alloc_name(dev, name) < 0)
225 goto failed_free;
226 }
227
Patrick McHardy2941a482006-01-08 22:05:26 -0800228 nt = netdev_priv(dev);
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 nt->parms = *parms;
Bjørn Mork1b1d8f72009-03-18 18:56:54 -0700231 ipip6_tunnel_init(dev);
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000232 ipip6_tunnel_clone_6rd(dev, sitn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100234 if (parms->i_flags & SIT_ISATAP)
235 dev->priv_flags |= IFF_ISATAP;
236
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800237 if (register_netdevice(dev) < 0)
238 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240 dev_hold(dev);
241
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700242 ipip6_tunnel_link(sitn, nt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 return nt;
244
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800245failed_free:
246 free_netdev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247failed:
248 return NULL;
249}
250
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000251static DEFINE_SPINLOCK(ipip6_prl_lock);
252
253#define for_each_prl_rcu(start) \
254 for (prl = rcu_dereference(start); \
255 prl; \
256 prl = rcu_dereference(prl->next))
257
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400258static struct ip_tunnel_prl_entry *
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900259__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400260{
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000261 struct ip_tunnel_prl_entry *prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400262
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000263 for_each_prl_rcu(t->prl)
264 if (prl->addr == addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400265 break;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000266 return prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400267
268}
269
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700270static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
271 struct ip_tunnel_prl __user *a)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900272{
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700273 struct ip_tunnel_prl kprl, *kp;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900274 struct ip_tunnel_prl_entry *prl;
275 unsigned int cmax, c = 0, ca, len;
276 int ret = 0;
277
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700278 if (copy_from_user(&kprl, a, sizeof(kprl)))
279 return -EFAULT;
280 cmax = kprl.datalen / sizeof(kprl);
281 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900282 cmax = 1;
283
284 /* For simple GET or for root users,
285 * we try harder to allocate.
286 */
287 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
288 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
289 NULL;
290
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000291 rcu_read_lock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900292
293 ca = t->prl_count < cmax ? t->prl_count : cmax;
294
295 if (!kp) {
296 /* We don't try hard to allocate much memory for
297 * non-root users.
298 * For root users, retry allocating enough memory for
299 * the answer.
300 */
301 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
302 if (!kp) {
303 ret = -ENOMEM;
304 goto out;
305 }
306 }
307
308 c = 0;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000309 for_each_prl_rcu(t->prl) {
Sascha Hlusiak298bf122009-09-29 11:27:05 +0000310 if (c >= cmax)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900311 break;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700312 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900313 continue;
314 kp[c].addr = prl->addr;
315 kp[c].flags = prl->flags;
316 c++;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700317 if (kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900318 break;
319 }
320out:
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000321 rcu_read_unlock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900322
323 len = sizeof(*kp) * c;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700324 ret = 0;
325 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
326 ret = -EFAULT;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900327
328 kfree(kp);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900329
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700330 return ret;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900331}
332
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400333static int
334ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
335{
336 struct ip_tunnel_prl_entry *p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900337 int err = 0;
338
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900339 if (a->addr == htonl(INADDR_ANY))
340 return -EINVAL;
341
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000342 spin_lock(&ipip6_prl_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400343
344 for (p = t->prl; p; p = p->next) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900345 if (p->addr == a->addr) {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000346 if (chg) {
347 p->flags = a->flags;
348 goto out;
349 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900350 err = -EEXIST;
351 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400352 }
353 }
354
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900355 if (chg) {
356 err = -ENXIO;
357 goto out;
358 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400359
360 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900361 if (!p) {
362 err = -ENOBUFS;
363 goto out;
364 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400365
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400366 p->next = t->prl;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900367 p->addr = a->addr;
368 p->flags = a->flags;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000369 t->prl_count++;
370 rcu_assign_pointer(t->prl, p);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900371out:
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000372 spin_unlock(&ipip6_prl_lock);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900373 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400374}
375
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000376static void prl_entry_destroy_rcu(struct rcu_head *head)
377{
378 kfree(container_of(head, struct ip_tunnel_prl_entry, rcu_head));
379}
380
381static void prl_list_destroy_rcu(struct rcu_head *head)
382{
383 struct ip_tunnel_prl_entry *p, *n;
384
385 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
386 do {
387 n = p->next;
388 kfree(p);
389 p = n;
390 } while (p);
391}
392
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400393static int
394ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
395{
396 struct ip_tunnel_prl_entry *x, **p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900397 int err = 0;
398
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000399 spin_lock(&ipip6_prl_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400400
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900401 if (a && a->addr != htonl(INADDR_ANY)) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400402 for (p = &t->prl; *p; p = &(*p)->next) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900403 if ((*p)->addr == a->addr) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400404 x = *p;
405 *p = x->next;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000406 call_rcu(&x->rcu_head, prl_entry_destroy_rcu);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900407 t->prl_count--;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900408 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400409 }
410 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900411 err = -ENXIO;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400412 } else {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000413 if (t->prl) {
414 t->prl_count = 0;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400415 x = t->prl;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000416 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
417 t->prl = NULL;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400418 }
419 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900420out:
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000421 spin_unlock(&ipip6_prl_lock);
Sascha Hlusiak4b27960172009-05-19 12:56:50 +0000422 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400423}
424
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400425static int
426isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
427{
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900428 struct ip_tunnel_prl_entry *p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400429 int ok = 1;
430
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000431 rcu_read_lock();
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900432 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400433 if (p) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900434 if (p->flags & PRL_DEFAULT)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400435 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
436 else
437 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
438 } else {
439 struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
440 if (ipv6_addr_is_isatap(addr6) &&
441 (addr6->s6_addr32[3] == iph->saddr) &&
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400442 ipv6_chk_prefix(addr6, t->dev))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400443 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
444 else
445 ok = 0;
446 }
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000447 rcu_read_unlock();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400448 return ok;
449}
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451static void ipip6_tunnel_uninit(struct net_device *dev)
452{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700453 struct net *net = dev_net(dev);
454 struct sit_net *sitn = net_generic(net, sit_net_id);
455
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700456 if (dev == sitn->fb_tunnel_dev) {
Eric Dumazet4543c102009-10-23 17:52:14 +0000457 spin_lock_bh(&ipip6_lock);
Pavel Emelyanov29182172008-04-16 01:16:38 -0700458 sitn->tunnels_wc[0] = NULL;
Eric Dumazet4543c102009-10-23 17:52:14 +0000459 spin_unlock_bh(&ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 dev_put(dev);
461 } else {
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700462 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
YOSHIFUJI Hideaki02e10b92008-04-10 15:41:27 +0900463 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 dev_put(dev);
465 }
466}
467
468
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800469static int ipip6_err(struct sk_buff *skb, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
Rami Rosen071f92d2008-05-21 17:47:54 -0700472/* All the routers (except for Linux) return only
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 8 bytes of packet payload. It means, that precise relaying of
474 ICMP in the real Internet is absolutely infeasible.
475 */
476 struct iphdr *iph = (struct iphdr*)skb->data;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300477 const int type = icmp_hdr(skb)->type;
478 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 struct ip_tunnel *t;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800480 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482 switch (type) {
483 default:
484 case ICMP_PARAMETERPROB:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800485 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487 case ICMP_DEST_UNREACH:
488 switch (code) {
489 case ICMP_SR_FAILED:
490 case ICMP_PORT_UNREACH:
491 /* Impossible event. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800492 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 case ICMP_FRAG_NEEDED:
494 /* Soft state for pmtu is maintained by IP core. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800495 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 default:
497 /* All others are translated to HOST_UNREACH.
498 rfc2003 contains "deep thoughts" about NET_UNREACH,
499 I believe they are just ether pollution. --ANK
500 */
501 break;
502 }
503 break;
504 case ICMP_TIME_EXCEEDED:
505 if (code != ICMP_EXC_TTL)
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800506 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 break;
508 }
509
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800510 err = -ENOENT;
511
Eric Dumazet4543c102009-10-23 17:52:14 +0000512 rcu_read_lock();
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000513 t = ipip6_tunnel_lookup(dev_net(skb->dev),
514 skb->dev,
515 iph->daddr,
516 iph->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 if (t == NULL || t->parms.iph.daddr == 0)
518 goto out;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800519
520 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
522 goto out;
523
Wei Yongjunbb800872009-02-24 23:37:19 -0800524 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 t->err_count++;
526 else
527 t->err_count = 1;
528 t->err_time = jiffies;
529out:
Eric Dumazet4543c102009-10-23 17:52:14 +0000530 rcu_read_unlock();
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800531 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532}
533
534static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
535{
536 if (INET_ECN_is_ce(iph->tos))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700537 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538}
539
540static int ipip6_rcv(struct sk_buff *skb)
541{
542 struct iphdr *iph;
543 struct ip_tunnel *tunnel;
544
545 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
546 goto out;
547
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700548 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Eric Dumazet4543c102009-10-23 17:52:14 +0000550 rcu_read_lock();
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000551 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
552 iph->saddr, iph->daddr);
553 if (tunnel != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700555 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700556 skb_reset_network_header(skb);
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800557 IPCB(skb)->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 skb->protocol = htons(ETH_P_IPV6);
559 skb->pkt_type = PACKET_HOST;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100560
561 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400562 !isatap_chksrc(skb, iph, tunnel)) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700563 tunnel->dev->stats.rx_errors++;
Eric Dumazet4543c102009-10-23 17:52:14 +0000564 rcu_read_unlock();
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100565 kfree_skb(skb);
566 return 0;
567 }
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700568 tunnel->dev->stats.rx_packets++;
569 tunnel->dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 skb->dev = tunnel->dev;
Eric Dumazetadf30902009-06-02 05:19:30 +0000571 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 nf_reset(skb);
573 ipip6_ecn_decapsulate(iph, skb);
574 netif_rx(skb);
Eric Dumazet4543c102009-10-23 17:52:14 +0000575 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 return 0;
577 }
578
Herbert Xu45af08b2006-04-05 22:31:19 -0700579 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
Eric Dumazet4543c102009-10-23 17:52:14 +0000580 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581out:
David S. Miller36ca34c2008-05-08 23:40:26 -0700582 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 return 0;
584}
585
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000586/*
587 * Returns the embedded IPv4 address if the IPv6 address
588 * comes from 6rd / 6to4 (RFC 3056) addr space.
589 */
590static inline
591__be32 try_6rd(struct in6_addr *v6dst, struct ip_tunnel *tunnel)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592{
Al Viroe69a4adc2006-11-14 20:56:00 -0800593 __be32 dst = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000595#ifdef CONFIG_IPV6_SIT_6RD
596 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
597 tunnel->ip6rd.prefixlen)) {
598 unsigned pbw0, pbi0;
599 int pbi1;
600 u32 d;
601
602 pbw0 = tunnel->ip6rd.prefixlen >> 5;
603 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
604
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000605 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000606 tunnel->ip6rd.relay_prefixlen;
607
608 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
609 if (pbi1 > 0)
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000610 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000611 (32 - pbi1);
612
613 dst = tunnel->ip6rd.relay_prefix | htonl(d);
614 }
615#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 if (v6dst->s6_addr16[0] == htons(0x2002)) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900617 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 memcpy(&dst, &v6dst->s6_addr16[1], 4);
619 }
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000620#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 return dst;
622}
623
624/*
625 * This function assumes it is being called from dev_queue_xmit()
626 * and that skb is filled properly by that function.
627 */
628
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000629static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
630 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
Patrick McHardy2941a482006-01-08 22:05:26 -0800632 struct ip_tunnel *tunnel = netdev_priv(dev);
Eric Dumazet0bfbedb2009-10-05 00:11:22 -0700633 struct net_device_stats *stats = &dev->stats;
634 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 struct iphdr *tiph = &tunnel->parms.iph;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700636 struct ipv6hdr *iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 u8 tos = tunnel->parms.iph.tos;
Herbert Xu292f4f32009-11-09 08:42:01 +0000638 __be16 df = tiph->frag_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 struct rtable *rt; /* Route to the other host */
640 struct net_device *tdev; /* Device to other host */
641 struct iphdr *iph; /* Our new IP header */
Chuck Leverc2636b42007-10-23 21:07:32 -0700642 unsigned int max_headroom; /* The extra header space needed */
Al Viroe69a4adc2006-11-14 20:56:00 -0800643 __be32 dst = tiph->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 int mtu;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900645 struct in6_addr *addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 int addr_type;
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 if (skb->protocol != htons(ETH_P_IPV6))
649 goto tx_error;
650
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100651 /* ISATAP (RFC4214) - must come before 6to4 */
652 if (dev->priv_flags & IFF_ISATAP) {
653 struct neighbour *neigh = NULL;
654
Eric Dumazetadf30902009-06-02 05:19:30 +0000655 if (skb_dst(skb))
656 neigh = skb_dst(skb)->neighbour;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100657
658 if (neigh == NULL) {
659 if (net_ratelimit())
660 printk(KERN_DEBUG "sit: nexthop == NULL\n");
661 goto tx_error;
662 }
663
664 addr6 = (struct in6_addr*)&neigh->primary_key;
665 addr_type = ipv6_addr_type(addr6);
666
667 if ((addr_type & IPV6_ADDR_UNICAST) &&
668 ipv6_addr_is_isatap(addr6))
669 dst = addr6->s6_addr32[3];
670 else
671 goto tx_error;
672 }
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 if (!dst)
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000675 dst = try_6rd(&iph6->daddr, tunnel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
677 if (!dst) {
678 struct neighbour *neigh = NULL;
679
Eric Dumazetadf30902009-06-02 05:19:30 +0000680 if (skb_dst(skb))
681 neigh = skb_dst(skb)->neighbour;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
683 if (neigh == NULL) {
684 if (net_ratelimit())
685 printk(KERN_DEBUG "sit: nexthop == NULL\n");
686 goto tx_error;
687 }
688
689 addr6 = (struct in6_addr*)&neigh->primary_key;
690 addr_type = ipv6_addr_type(addr6);
691
692 if (addr_type == IPV6_ADDR_ANY) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700693 addr6 = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 addr_type = ipv6_addr_type(addr6);
695 }
696
697 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
698 goto tx_error_icmp;
699
700 dst = addr6->s6_addr32[3];
701 }
702
703 {
704 struct flowi fl = { .nl_u = { .ip4_u =
705 { .daddr = dst,
706 .saddr = tiph->saddr,
707 .tos = RT_TOS(tos) } },
708 .oif = tunnel->parms.link,
709 .proto = IPPROTO_IPV6 };
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700710 if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700711 stats->tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 goto tx_error_icmp;
713 }
714 }
715 if (rt->rt_type != RTN_UNICAST) {
716 ip_rt_put(rt);
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700717 stats->tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 goto tx_error_icmp;
719 }
720 tdev = rt->u.dst.dev;
721
722 if (tdev == dev) {
723 ip_rt_put(rt);
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700724 stats->collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 goto tx_error;
726 }
727
Herbert Xu292f4f32009-11-09 08:42:01 +0000728 if (df) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
Herbert Xu292f4f32009-11-09 08:42:01 +0000731 if (mtu < 68) {
732 stats->collisions++;
733 ip_rt_put(rt);
734 goto tx_error;
735 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
Herbert Xu292f4f32009-11-09 08:42:01 +0000737 if (mtu < IPV6_MIN_MTU) {
738 mtu = IPV6_MIN_MTU;
739 df = 0;
740 }
741
742 if (tunnel->parms.iph.daddr && skb_dst(skb))
743 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
744
745 if (skb->len > mtu) {
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000746 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Herbert Xu292f4f32009-11-09 08:42:01 +0000747 ip_rt_put(rt);
748 goto tx_error;
749 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 }
751
752 if (tunnel->err_count > 0) {
Wei Yongjunbb800872009-02-24 23:37:19 -0800753 if (time_before(jiffies,
754 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 tunnel->err_count--;
756 dst_link_failure(skb);
757 } else
758 tunnel->err_count = 0;
759 }
760
761 /*
762 * Okay, now see if we can stuff it in the buffer as-is.
763 */
764 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
765
Patrick McHardycfbba492007-07-09 15:33:40 -0700766 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
767 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
769 if (!new_skb) {
770 ip_rt_put(rt);
Eric Dumazet0bfbedb2009-10-05 00:11:22 -0700771 txq->tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000773 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 }
775 if (skb->sk)
776 skb_set_owner_w(new_skb, skb->sk);
777 dev_kfree_skb(skb);
778 skb = new_skb;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700779 iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 }
781
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700782 skb->transport_header = skb->network_header;
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700783 skb_push(skb, sizeof(struct iphdr));
784 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800786 IPCB(skb)->flags = 0;
Eric Dumazetadf30902009-06-02 05:19:30 +0000787 skb_dst_drop(skb);
788 skb_dst_set(skb, &rt->u.dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
790 /*
791 * Push down and install the IPIP header.
792 */
793
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700794 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 iph->version = 4;
796 iph->ihl = sizeof(struct iphdr)>>2;
Herbert Xu292f4f32009-11-09 08:42:01 +0000797 iph->frag_off = df;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 iph->protocol = IPPROTO_IPV6;
799 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
800 iph->daddr = rt->rt_dst;
801 iph->saddr = rt->rt_src;
802
803 if ((iph->ttl = tiph->ttl) == 0)
804 iph->ttl = iph6->hop_limit;
805
806 nf_reset(skb);
807
808 IPTUNNEL_XMIT();
Patrick McHardy6ed10652009-06-23 06:03:08 +0000809 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
811tx_error_icmp:
812 dst_link_failure(skb);
813tx_error:
814 stats->tx_errors++;
815 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000816 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817}
818
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800819static void ipip6_tunnel_bind_dev(struct net_device *dev)
820{
821 struct net_device *tdev = NULL;
822 struct ip_tunnel *tunnel;
823 struct iphdr *iph;
824
825 tunnel = netdev_priv(dev);
826 iph = &tunnel->parms.iph;
827
828 if (iph->daddr) {
829 struct flowi fl = { .nl_u = { .ip4_u =
830 { .daddr = iph->daddr,
831 .saddr = iph->saddr,
832 .tos = RT_TOS(iph->tos) } },
833 .oif = tunnel->parms.link,
834 .proto = IPPROTO_IPV6 };
835 struct rtable *rt;
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700836 if (!ip_route_output_key(dev_net(dev), &rt, &fl)) {
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800837 tdev = rt->u.dst.dev;
838 ip_rt_put(rt);
839 }
840 dev->flags |= IFF_POINTOPOINT;
841 }
842
843 if (!tdev && tunnel->parms.link)
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700844 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800845
846 if (tdev) {
847 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
848 dev->mtu = tdev->mtu - sizeof(struct iphdr);
849 if (dev->mtu < IPV6_MIN_MTU)
850 dev->mtu = IPV6_MIN_MTU;
851 }
852 dev->iflink = tunnel->parms.link;
853}
854
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855static int
856ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
857{
858 int err = 0;
859 struct ip_tunnel_parm p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400860 struct ip_tunnel_prl prl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 struct ip_tunnel *t;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700862 struct net *net = dev_net(dev);
863 struct sit_net *sitn = net_generic(net, sit_net_id);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000864#ifdef CONFIG_IPV6_SIT_6RD
865 struct ip_tunnel_6rd ip6rd;
866#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
868 switch (cmd) {
869 case SIOCGETTUNNEL:
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000870#ifdef CONFIG_IPV6_SIT_6RD
871 case SIOCGET6RD:
872#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 t = NULL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700874 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
876 err = -EFAULT;
877 break;
878 }
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700879 t = ipip6_tunnel_locate(net, &p, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 }
881 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -0800882 t = netdev_priv(dev);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000883
884 err = -EFAULT;
885 if (cmd == SIOCGETTUNNEL) {
886 memcpy(&p, &t->parms, sizeof(p));
887 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
888 sizeof(p)))
889 goto done;
890#ifdef CONFIG_IPV6_SIT_6RD
891 } else {
892 ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix);
893 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
894 ip6rd.prefixlen = t->ip6rd.prefixlen;
895 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
896 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
897 sizeof(ip6rd)))
898 goto done;
899#endif
900 }
901 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 break;
903
904 case SIOCADDTUNNEL:
905 case SIOCCHGTUNNEL:
906 err = -EPERM;
907 if (!capable(CAP_NET_ADMIN))
908 goto done;
909
910 err = -EFAULT;
911 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
912 goto done;
913
914 err = -EINVAL;
915 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
916 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
917 goto done;
918 if (p.iph.ttl)
919 p.iph.frag_off |= htons(IP_DF);
920
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700921 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700923 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 if (t != NULL) {
925 if (t->dev != dev) {
926 err = -EEXIST;
927 break;
928 }
929 } else {
930 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
931 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
932 err = -EINVAL;
933 break;
934 }
Patrick McHardy2941a482006-01-08 22:05:26 -0800935 t = netdev_priv(dev);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700936 ipip6_tunnel_unlink(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 t->parms.iph.saddr = p.iph.saddr;
938 t->parms.iph.daddr = p.iph.daddr;
939 memcpy(dev->dev_addr, &p.iph.saddr, 4);
940 memcpy(dev->broadcast, &p.iph.daddr, 4);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700941 ipip6_tunnel_link(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 netdev_state_change(dev);
943 }
944 }
945
946 if (t) {
947 err = 0;
948 if (cmd == SIOCCHGTUNNEL) {
949 t->parms.iph.ttl = p.iph.ttl;
950 t->parms.iph.tos = p.iph.tos;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800951 if (t->parms.link != p.link) {
952 t->parms.link = p.link;
953 ipip6_tunnel_bind_dev(dev);
954 netdev_state_change(dev);
955 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 }
957 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
958 err = -EFAULT;
959 } else
960 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
961 break;
962
963 case SIOCDELTUNNEL:
964 err = -EPERM;
965 if (!capable(CAP_NET_ADMIN))
966 goto done;
967
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700968 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 err = -EFAULT;
970 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
971 goto done;
972 err = -ENOENT;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700973 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 goto done;
975 err = -EPERM;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700976 if (t == netdev_priv(sitn->fb_tunnel_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 goto done;
978 dev = t->dev;
979 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -0800980 unregister_netdevice(dev);
981 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 break;
983
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900984 case SIOCGETPRL:
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700985 err = -EINVAL;
986 if (dev == sitn->fb_tunnel_dev)
987 goto done;
988 err = -ENOENT;
989 if (!(t = netdev_priv(dev)))
990 goto done;
991 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
992 break;
993
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400994 case SIOCADDPRL:
995 case SIOCDELPRL:
996 case SIOCCHGPRL:
997 err = -EPERM;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700998 if (!capable(CAP_NET_ADMIN))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400999 goto done;
1000 err = -EINVAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001001 if (dev == sitn->fb_tunnel_dev)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001002 goto done;
1003 err = -EFAULT;
1004 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1005 goto done;
1006 err = -ENOENT;
1007 if (!(t = netdev_priv(dev)))
1008 goto done;
1009
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001010 switch (cmd) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001011 case SIOCDELPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001012 err = ipip6_tunnel_del_prl(t, &prl);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001013 break;
1014 case SIOCADDPRL:
1015 case SIOCCHGPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001016 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001017 break;
1018 }
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001019 netdev_state_change(dev);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001020 break;
1021
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001022#ifdef CONFIG_IPV6_SIT_6RD
1023 case SIOCADD6RD:
1024 case SIOCCHG6RD:
1025 case SIOCDEL6RD:
1026 err = -EPERM;
1027 if (!capable(CAP_NET_ADMIN))
1028 goto done;
1029
1030 err = -EFAULT;
1031 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1032 sizeof(ip6rd)))
1033 goto done;
1034
1035 t = netdev_priv(dev);
1036
1037 if (cmd != SIOCDEL6RD) {
1038 struct in6_addr prefix;
1039 __be32 relay_prefix;
1040
1041 err = -EINVAL;
1042 if (ip6rd.relay_prefixlen > 32 ||
1043 ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64)
1044 goto done;
1045
1046 ipv6_addr_prefix(&prefix, &ip6rd.prefix,
1047 ip6rd.prefixlen);
1048 if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
1049 goto done;
YOSHIFUJI Hideaki / 吉藤英明91b2a3f2009-10-11 03:45:13 +00001050 if (ip6rd.relay_prefixlen)
1051 relay_prefix = ip6rd.relay_prefix &
1052 htonl(0xffffffffUL <<
1053 (32 - ip6rd.relay_prefixlen));
1054 else
1055 relay_prefix = 0;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001056 if (relay_prefix != ip6rd.relay_prefix)
1057 goto done;
1058
1059 ipv6_addr_copy(&t->ip6rd.prefix, &prefix);
1060 t->ip6rd.relay_prefix = relay_prefix;
1061 t->ip6rd.prefixlen = ip6rd.prefixlen;
1062 t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen;
1063 } else
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001064 ipip6_tunnel_clone_6rd(dev, sitn);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001065
1066 err = 0;
1067 break;
1068#endif
1069
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 default:
1071 err = -EINVAL;
1072 }
1073
1074done:
1075 return err;
1076}
1077
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1079{
1080 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1081 return -EINVAL;
1082 dev->mtu = new_mtu;
1083 return 0;
1084}
1085
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001086static const struct net_device_ops ipip6_netdev_ops = {
1087 .ndo_uninit = ipip6_tunnel_uninit,
1088 .ndo_start_xmit = ipip6_tunnel_xmit,
1089 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1090 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1091};
1092
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093static void ipip6_tunnel_setup(struct net_device *dev)
1094{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001095 dev->netdev_ops = &ipip6_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 dev->destructor = free_netdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097
1098 dev->type = ARPHRD_SIT;
1099 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
Kris Katterjohn46f25df2006-01-05 16:35:42 -08001100 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 dev->flags = IFF_NOARP;
Sascha Hlusiakf2ba0252009-07-11 20:30:52 -07001102 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 dev->iflink = 0;
1104 dev->addr_len = 4;
Pavel Emelyanov7a971462008-04-16 01:17:18 -07001105 dev->features |= NETIF_F_NETNS_LOCAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106}
1107
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001108static void ipip6_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001110 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111
1112 tunnel->dev = dev;
1113 strcpy(tunnel->parms.name, dev->name);
1114
1115 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1116 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1117
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001118 ipip6_tunnel_bind_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119}
1120
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001121static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122{
Patrick McHardy2941a482006-01-08 22:05:26 -08001123 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 struct iphdr *iph = &tunnel->parms.iph;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001125 struct net *net = dev_net(dev);
1126 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127
1128 tunnel->dev = dev;
1129 strcpy(tunnel->parms.name, dev->name);
1130
1131 iph->version = 4;
1132 iph->protocol = IPPROTO_IPV6;
1133 iph->ihl = 5;
1134 iph->ttl = 64;
1135
1136 dev_hold(dev);
Pavel Emelyanov29182172008-04-16 01:16:38 -07001137 sitn->tunnels_wc[0] = tunnel;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138}
1139
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001140static struct xfrm_tunnel sit_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 .handler = ipip6_rcv,
1142 .err_handler = ipip6_err,
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001143 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144};
1145
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001146static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001147{
1148 int prio;
1149
1150 for (prio = 1; prio < 4; prio++) {
1151 int h;
1152 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet62808f92009-10-28 04:37:43 +00001153 struct ip_tunnel *t = sitn->tunnels[prio][h];
1154
1155 while (t != NULL) {
1156 unregister_netdevice_queue(t->dev, head);
1157 t = t->next;
1158 }
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001159 }
1160 }
1161}
1162
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001163static int __net_init sit_init_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001164{
Eric W. Biederman67101172009-11-29 15:46:16 +00001165 struct sit_net *sitn = net_generic(net, sit_net_id);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001166 int err;
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001167
Pavel Emelyanov29182172008-04-16 01:16:38 -07001168 sitn->tunnels[0] = sitn->tunnels_wc;
1169 sitn->tunnels[1] = sitn->tunnels_l;
1170 sitn->tunnels[2] = sitn->tunnels_r;
1171 sitn->tunnels[3] = sitn->tunnels_r_l;
1172
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001173 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1174 ipip6_tunnel_setup);
1175 if (!sitn->fb_tunnel_dev) {
1176 err = -ENOMEM;
1177 goto err_alloc_dev;
1178 }
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001179 dev_net_set(sitn->fb_tunnel_dev, net);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001180
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001181 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001182 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001183
1184 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1185 goto err_reg_dev;
1186
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001187 return 0;
1188
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001189err_reg_dev:
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001190 dev_put(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001191 free_netdev(sitn->fb_tunnel_dev);
1192err_alloc_dev:
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001193 return err;
1194}
1195
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001196static void __net_exit sit_exit_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001197{
Eric W. Biederman67101172009-11-29 15:46:16 +00001198 struct sit_net *sitn = net_generic(net, sit_net_id);
Eric Dumazet62808f92009-10-28 04:37:43 +00001199 LIST_HEAD(list);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001200
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001201 rtnl_lock();
Eric Dumazet62808f92009-10-28 04:37:43 +00001202 sit_destroy_tunnels(sitn, &list);
1203 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1204 unregister_netdevice_many(&list);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001205 rtnl_unlock();
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001206}
1207
1208static struct pernet_operations sit_net_ops = {
1209 .init = sit_init_net,
1210 .exit = sit_exit_net,
Eric W. Biederman67101172009-11-29 15:46:16 +00001211 .id = &sit_net_id,
1212 .size = sizeof(struct sit_net),
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001213};
1214
Adrian Bunk89c89452006-11-20 16:56:48 -08001215static void __exit sit_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216{
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001217 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001218
Eric W. Biederman67101172009-11-29 15:46:16 +00001219 unregister_pernet_device(&sit_net_ops);
Eric Dumazetef9a9d12009-10-23 17:51:26 +00001220 rcu_barrier(); /* Wait for completion of call_rcu()'s */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221}
1222
Adrian Bunk89c89452006-11-20 16:56:48 -08001223static int __init sit_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224{
1225 int err;
1226
1227 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1228
Eric W. Biederman67101172009-11-29 15:46:16 +00001229 err = register_pernet_device(&sit_net_ops);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001230 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001231 return err;
1232 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1233 if (err < 0) {
1234 unregister_pernet_device(&sit_net_ops);
1235 printk(KERN_INFO "sit init: Can't add protocol\n");
1236 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238}
Joerg Roedel989e5b92006-10-10 14:47:44 -07001239
1240module_init(sit_init);
1241module_exit(sit_cleanup);
Jan Dittmer39c85082006-10-13 15:05:53 -07001242MODULE_LICENSE("GPL");
Patrick McHardydaccff02006-11-05 15:47:04 -08001243MODULE_ALIAS("sit0");