blob: 2362a3397e91e40fd0c2907bd55fbd6512ea1d30 [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 Viroe69a4ad2006-11-14 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_fb_tunnel_init(struct net_device *dev);
66static void ipip6_tunnel_init(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067static void ipip6_tunnel_setup(struct net_device *dev);
68
Pavel Emelyanov8190d902008-04-16 01:15:17 -070069static int sit_net_id;
70struct sit_net {
Pavel Emelyanov29182172008-04-16 01:16:38 -070071 struct ip_tunnel *tunnels_r_l[HASH_SIZE];
72 struct ip_tunnel *tunnels_r[HASH_SIZE];
73 struct ip_tunnel *tunnels_l[HASH_SIZE];
74 struct ip_tunnel *tunnels_wc[1];
75 struct ip_tunnel **tunnels[4];
76
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -070077 struct net_device *fb_tunnel_dev;
Pavel Emelyanov8190d902008-04-16 01:15:17 -070078};
79
Eric Dumazet4543c102009-10-23 17:52:14 +000080/*
81 * Locking : hash tables are protected by RCU and a spinlock
82 */
83static DEFINE_SPINLOCK(ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Eric Dumazet4543c102009-10-23 17:52:14 +000085#define for_each_ip_tunnel_rcu(start) \
86 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
87
88/*
89 * Must be invoked with rcu_read_lock
90 */
Pavel Emelyanovca8def12008-04-16 01:15:39 -070091static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +000092 struct net_device *dev, __be32 remote, __be32 local)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
94 unsigned h0 = HASH(remote);
95 unsigned h1 = HASH(local);
96 struct ip_tunnel *t;
Pavel Emelyanov29182172008-04-16 01:16:38 -070097 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Eric Dumazet4543c102009-10-23 17:52:14 +000099 for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000101 remote == t->parms.iph.daddr &&
102 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
103 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 return t;
105 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000106 for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000107 if (remote == t->parms.iph.daddr &&
108 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
109 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 return t;
111 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000112 for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000113 if (local == t->parms.iph.saddr &&
114 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
115 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return t;
117 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000118 t = rcu_dereference(sitn->tunnels_wc[0]);
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000119 if ((t != NULL) && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 return t;
121 return NULL;
122}
123
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700124static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn,
125 struct ip_tunnel_parm *parms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900127 __be32 remote = parms->iph.daddr;
128 __be32 local = parms->iph.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 unsigned h = 0;
130 int prio = 0;
131
132 if (remote) {
133 prio |= 2;
134 h ^= HASH(remote);
135 }
136 if (local) {
137 prio |= 1;
138 h ^= HASH(local);
139 }
Pavel Emelyanov29182172008-04-16 01:16:38 -0700140 return &sitn->tunnels[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141}
142
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700143static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn,
144 struct ip_tunnel *t)
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900145{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700146 return __ipip6_bucket(sitn, &t->parms);
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900147}
148
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700149static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
151 struct ip_tunnel **tp;
152
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700153 for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 if (t == *tp) {
Eric Dumazet4543c102009-10-23 17:52:14 +0000155 spin_lock_bh(&ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 *tp = t->next;
Eric Dumazet4543c102009-10-23 17:52:14 +0000157 spin_unlock_bh(&ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 break;
159 }
160 }
161}
162
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700163static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700165 struct ip_tunnel **tp = ipip6_bucket(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Eric Dumazet4543c102009-10-23 17:52:14 +0000167 spin_lock_bh(&ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 t->next = *tp;
Eric Dumazet4543c102009-10-23 17:52:14 +0000169 rcu_assign_pointer(*tp, t);
170 spin_unlock_bh(&ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
172
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000173static 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 +0000174{
175#ifdef CONFIG_IPV6_SIT_6RD
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000176 struct ip_tunnel *t = netdev_priv(dev);
177
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000178 if (t->dev == sitn->fb_tunnel_dev) {
179 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
180 t->ip6rd.relay_prefix = 0;
181 t->ip6rd.prefixlen = 16;
182 t->ip6rd.relay_prefixlen = 0;
183 } else {
184 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
185 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
186 }
187#endif
188}
189
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700190static struct ip_tunnel * ipip6_tunnel_locate(struct net *net,
191 struct ip_tunnel_parm *parms, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
Al Viroe69a4ad2006-11-14 20:56:00 -0800193 __be32 remote = parms->iph.daddr;
194 __be32 local = parms->iph.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 struct ip_tunnel *t, **tp, *nt;
196 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 char name[IFNAMSIZ];
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700198 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700200 for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000201 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000202 remote == t->parms.iph.daddr &&
203 parms->link == t->parms.link) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000204 if (create)
205 return NULL;
206 else
207 return t;
208 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 }
210 if (!create)
211 goto failed;
212
213 if (parms->name[0])
214 strlcpy(name, parms->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800215 else
216 sprintf(name, "sit%%d");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
219 if (dev == NULL)
220 return NULL;
221
Pavel Emelyanov7a971462008-04-16 01:17:18 -0700222 dev_net_set(dev, net);
223
Pavel Emelyanovb37d4282008-02-26 23:51:04 -0800224 if (strchr(name, '%')) {
225 if (dev_alloc_name(dev, name) < 0)
226 goto failed_free;
227 }
228
Patrick McHardy2941a482006-01-08 22:05:26 -0800229 nt = netdev_priv(dev);
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 nt->parms = *parms;
Bjørn Mork1b1d8f72009-03-18 18:56:54 -0700232 ipip6_tunnel_init(dev);
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000233 ipip6_tunnel_clone_6rd(dev, sitn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100235 if (parms->i_flags & SIT_ISATAP)
236 dev->priv_flags |= IFF_ISATAP;
237
Pavel Emelyanovb37d4282008-02-26 23:51:04 -0800238 if (register_netdevice(dev) < 0)
239 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 dev_hold(dev);
242
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700243 ipip6_tunnel_link(sitn, nt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 return nt;
245
Pavel Emelyanovb37d4282008-02-26 23:51:04 -0800246failed_free:
247 free_netdev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248failed:
249 return NULL;
250}
251
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000252static DEFINE_SPINLOCK(ipip6_prl_lock);
253
254#define for_each_prl_rcu(start) \
255 for (prl = rcu_dereference(start); \
256 prl; \
257 prl = rcu_dereference(prl->next))
258
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400259static struct ip_tunnel_prl_entry *
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900260__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400261{
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000262 struct ip_tunnel_prl_entry *prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400263
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000264 for_each_prl_rcu(t->prl)
265 if (prl->addr == addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400266 break;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000267 return prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400268
269}
270
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700271static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
272 struct ip_tunnel_prl __user *a)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900273{
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700274 struct ip_tunnel_prl kprl, *kp;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900275 struct ip_tunnel_prl_entry *prl;
276 unsigned int cmax, c = 0, ca, len;
277 int ret = 0;
278
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700279 if (copy_from_user(&kprl, a, sizeof(kprl)))
280 return -EFAULT;
281 cmax = kprl.datalen / sizeof(kprl);
282 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900283 cmax = 1;
284
285 /* For simple GET or for root users,
286 * we try harder to allocate.
287 */
288 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
289 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
290 NULL;
291
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000292 rcu_read_lock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900293
294 ca = t->prl_count < cmax ? t->prl_count : cmax;
295
296 if (!kp) {
297 /* We don't try hard to allocate much memory for
298 * non-root users.
299 * For root users, retry allocating enough memory for
300 * the answer.
301 */
302 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
303 if (!kp) {
304 ret = -ENOMEM;
305 goto out;
306 }
307 }
308
309 c = 0;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000310 for_each_prl_rcu(t->prl) {
Sascha Hlusiak298bf122009-09-29 11:27:05 +0000311 if (c >= cmax)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900312 break;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700313 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900314 continue;
315 kp[c].addr = prl->addr;
316 kp[c].flags = prl->flags;
317 c++;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700318 if (kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900319 break;
320 }
321out:
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000322 rcu_read_unlock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900323
324 len = sizeof(*kp) * c;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700325 ret = 0;
326 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
327 ret = -EFAULT;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900328
329 kfree(kp);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900330
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700331 return ret;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900332}
333
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400334static int
335ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
336{
337 struct ip_tunnel_prl_entry *p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900338 int err = 0;
339
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900340 if (a->addr == htonl(INADDR_ANY))
341 return -EINVAL;
342
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000343 spin_lock(&ipip6_prl_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400344
345 for (p = t->prl; p; p = p->next) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900346 if (p->addr == a->addr) {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000347 if (chg) {
348 p->flags = a->flags;
349 goto out;
350 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900351 err = -EEXIST;
352 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400353 }
354 }
355
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900356 if (chg) {
357 err = -ENXIO;
358 goto out;
359 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400360
361 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900362 if (!p) {
363 err = -ENOBUFS;
364 goto out;
365 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400366
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000367 INIT_RCU_HEAD(&p->rcu_head);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400368 p->next = t->prl;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900369 p->addr = a->addr;
370 p->flags = a->flags;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000371 t->prl_count++;
372 rcu_assign_pointer(t->prl, p);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900373out:
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000374 spin_unlock(&ipip6_prl_lock);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900375 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400376}
377
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000378static void prl_entry_destroy_rcu(struct rcu_head *head)
379{
380 kfree(container_of(head, struct ip_tunnel_prl_entry, rcu_head));
381}
382
383static void prl_list_destroy_rcu(struct rcu_head *head)
384{
385 struct ip_tunnel_prl_entry *p, *n;
386
387 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
388 do {
389 n = p->next;
390 kfree(p);
391 p = n;
392 } while (p);
393}
394
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400395static int
396ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
397{
398 struct ip_tunnel_prl_entry *x, **p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900399 int err = 0;
400
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000401 spin_lock(&ipip6_prl_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400402
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900403 if (a && a->addr != htonl(INADDR_ANY)) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400404 for (p = &t->prl; *p; p = &(*p)->next) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900405 if ((*p)->addr == a->addr) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400406 x = *p;
407 *p = x->next;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000408 call_rcu(&x->rcu_head, prl_entry_destroy_rcu);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900409 t->prl_count--;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900410 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400411 }
412 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900413 err = -ENXIO;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400414 } else {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000415 if (t->prl) {
416 t->prl_count = 0;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400417 x = t->prl;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000418 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
419 t->prl = NULL;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400420 }
421 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900422out:
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000423 spin_unlock(&ipip6_prl_lock);
Sascha Hlusiak4b27960172009-05-19 12:56:50 +0000424 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400425}
426
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400427static int
428isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
429{
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900430 struct ip_tunnel_prl_entry *p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400431 int ok = 1;
432
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000433 rcu_read_lock();
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900434 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400435 if (p) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900436 if (p->flags & PRL_DEFAULT)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400437 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
438 else
439 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
440 } else {
441 struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
442 if (ipv6_addr_is_isatap(addr6) &&
443 (addr6->s6_addr32[3] == iph->saddr) &&
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400444 ipv6_chk_prefix(addr6, t->dev))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400445 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
446 else
447 ok = 0;
448 }
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000449 rcu_read_unlock();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400450 return ok;
451}
452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453static void ipip6_tunnel_uninit(struct net_device *dev)
454{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700455 struct net *net = dev_net(dev);
456 struct sit_net *sitn = net_generic(net, sit_net_id);
457
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700458 if (dev == sitn->fb_tunnel_dev) {
Eric Dumazet4543c102009-10-23 17:52:14 +0000459 spin_lock_bh(&ipip6_lock);
Pavel Emelyanov29182172008-04-16 01:16:38 -0700460 sitn->tunnels_wc[0] = NULL;
Eric Dumazet4543c102009-10-23 17:52:14 +0000461 spin_unlock_bh(&ipip6_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 dev_put(dev);
463 } else {
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700464 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
YOSHIFUJI Hideaki02e10b92008-04-10 15:41:27 +0900465 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 dev_put(dev);
467 }
468}
469
470
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800471static int ipip6_err(struct sk_buff *skb, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
Rami Rosen071f92d2008-05-21 17:47:54 -0700474/* All the routers (except for Linux) return only
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 8 bytes of packet payload. It means, that precise relaying of
476 ICMP in the real Internet is absolutely infeasible.
477 */
478 struct iphdr *iph = (struct iphdr*)skb->data;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300479 const int type = icmp_hdr(skb)->type;
480 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 struct ip_tunnel *t;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800482 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 switch (type) {
485 default:
486 case ICMP_PARAMETERPROB:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800487 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 case ICMP_DEST_UNREACH:
490 switch (code) {
491 case ICMP_SR_FAILED:
492 case ICMP_PORT_UNREACH:
493 /* Impossible event. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800494 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 case ICMP_FRAG_NEEDED:
496 /* Soft state for pmtu is maintained by IP core. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800497 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 default:
499 /* All others are translated to HOST_UNREACH.
500 rfc2003 contains "deep thoughts" about NET_UNREACH,
501 I believe they are just ether pollution. --ANK
502 */
503 break;
504 }
505 break;
506 case ICMP_TIME_EXCEEDED:
507 if (code != ICMP_EXC_TTL)
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800508 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 break;
510 }
511
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800512 err = -ENOENT;
513
Eric Dumazet4543c102009-10-23 17:52:14 +0000514 rcu_read_lock();
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000515 t = ipip6_tunnel_lookup(dev_net(skb->dev),
516 skb->dev,
517 iph->daddr,
518 iph->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 if (t == NULL || t->parms.iph.daddr == 0)
520 goto out;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800521
522 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
524 goto out;
525
Wei Yongjunbb800872009-02-24 23:37:19 -0800526 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 t->err_count++;
528 else
529 t->err_count = 1;
530 t->err_time = jiffies;
531out:
Eric Dumazet4543c102009-10-23 17:52:14 +0000532 rcu_read_unlock();
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800533 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534}
535
536static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
537{
538 if (INET_ECN_is_ce(iph->tos))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700539 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540}
541
542static int ipip6_rcv(struct sk_buff *skb)
543{
544 struct iphdr *iph;
545 struct ip_tunnel *tunnel;
546
547 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
548 goto out;
549
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700550 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Eric Dumazet4543c102009-10-23 17:52:14 +0000552 rcu_read_lock();
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000553 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
554 iph->saddr, iph->daddr);
555 if (tunnel != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700557 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700558 skb_reset_network_header(skb);
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800559 IPCB(skb)->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 skb->protocol = htons(ETH_P_IPV6);
561 skb->pkt_type = PACKET_HOST;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100562
563 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400564 !isatap_chksrc(skb, iph, tunnel)) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700565 tunnel->dev->stats.rx_errors++;
Eric Dumazet4543c102009-10-23 17:52:14 +0000566 rcu_read_unlock();
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100567 kfree_skb(skb);
568 return 0;
569 }
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700570 tunnel->dev->stats.rx_packets++;
571 tunnel->dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 skb->dev = tunnel->dev;
Eric Dumazetadf30902009-06-02 05:19:30 +0000573 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 nf_reset(skb);
575 ipip6_ecn_decapsulate(iph, skb);
576 netif_rx(skb);
Eric Dumazet4543c102009-10-23 17:52:14 +0000577 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 return 0;
579 }
580
Herbert Xu45af08b2006-04-05 22:31:19 -0700581 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
Eric Dumazet4543c102009-10-23 17:52:14 +0000582 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583out:
David S. Miller36ca34c2008-05-08 23:40:26 -0700584 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 return 0;
586}
587
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000588/*
589 * Returns the embedded IPv4 address if the IPv6 address
590 * comes from 6rd / 6to4 (RFC 3056) addr space.
591 */
592static inline
593__be32 try_6rd(struct in6_addr *v6dst, struct ip_tunnel *tunnel)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594{
Al Viroe69a4ad2006-11-14 20:56:00 -0800595 __be32 dst = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000597#ifdef CONFIG_IPV6_SIT_6RD
598 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
599 tunnel->ip6rd.prefixlen)) {
600 unsigned pbw0, pbi0;
601 int pbi1;
602 u32 d;
603
604 pbw0 = tunnel->ip6rd.prefixlen >> 5;
605 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
606
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000607 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000608 tunnel->ip6rd.relay_prefixlen;
609
610 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
611 if (pbi1 > 0)
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000612 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000613 (32 - pbi1);
614
615 dst = tunnel->ip6rd.relay_prefix | htonl(d);
616 }
617#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 if (v6dst->s6_addr16[0] == htons(0x2002)) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900619 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 memcpy(&dst, &v6dst->s6_addr16[1], 4);
621 }
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000622#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 return dst;
624}
625
626/*
627 * This function assumes it is being called from dev_queue_xmit()
628 * and that skb is filled properly by that function.
629 */
630
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000631static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
632 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633{
Patrick McHardy2941a482006-01-08 22:05:26 -0800634 struct ip_tunnel *tunnel = netdev_priv(dev);
Eric Dumazet0bfbedb2009-10-05 00:11:22 -0700635 struct net_device_stats *stats = &dev->stats;
636 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 struct iphdr *tiph = &tunnel->parms.iph;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700638 struct ipv6hdr *iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 u8 tos = tunnel->parms.iph.tos;
640 struct rtable *rt; /* Route to the other host */
641 struct net_device *tdev; /* Device to other host */
642 struct iphdr *iph; /* Our new IP header */
Chuck Leverc2636b42007-10-23 21:07:32 -0700643 unsigned int max_headroom; /* The extra header space needed */
Al Viroe69a4ad2006-11-14 20:56:00 -0800644 __be32 dst = tiph->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 int mtu;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900646 struct in6_addr *addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 int addr_type;
648
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 if (skb->protocol != htons(ETH_P_IPV6))
650 goto tx_error;
651
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100652 /* ISATAP (RFC4214) - must come before 6to4 */
653 if (dev->priv_flags & IFF_ISATAP) {
654 struct neighbour *neigh = NULL;
655
Eric Dumazetadf30902009-06-02 05:19:30 +0000656 if (skb_dst(skb))
657 neigh = skb_dst(skb)->neighbour;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100658
659 if (neigh == NULL) {
660 if (net_ratelimit())
661 printk(KERN_DEBUG "sit: nexthop == NULL\n");
662 goto tx_error;
663 }
664
665 addr6 = (struct in6_addr*)&neigh->primary_key;
666 addr_type = ipv6_addr_type(addr6);
667
668 if ((addr_type & IPV6_ADDR_UNICAST) &&
669 ipv6_addr_is_isatap(addr6))
670 dst = addr6->s6_addr32[3];
671 else
672 goto tx_error;
673 }
674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 if (!dst)
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000676 dst = try_6rd(&iph6->daddr, tunnel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
678 if (!dst) {
679 struct neighbour *neigh = NULL;
680
Eric Dumazetadf30902009-06-02 05:19:30 +0000681 if (skb_dst(skb))
682 neigh = skb_dst(skb)->neighbour;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
684 if (neigh == NULL) {
685 if (net_ratelimit())
686 printk(KERN_DEBUG "sit: nexthop == NULL\n");
687 goto tx_error;
688 }
689
690 addr6 = (struct in6_addr*)&neigh->primary_key;
691 addr_type = ipv6_addr_type(addr6);
692
693 if (addr_type == IPV6_ADDR_ANY) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700694 addr6 = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 addr_type = ipv6_addr_type(addr6);
696 }
697
698 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
699 goto tx_error_icmp;
700
701 dst = addr6->s6_addr32[3];
702 }
703
704 {
705 struct flowi fl = { .nl_u = { .ip4_u =
706 { .daddr = dst,
707 .saddr = tiph->saddr,
708 .tos = RT_TOS(tos) } },
709 .oif = tunnel->parms.link,
710 .proto = IPPROTO_IPV6 };
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700711 if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700712 stats->tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 goto tx_error_icmp;
714 }
715 }
716 if (rt->rt_type != RTN_UNICAST) {
717 ip_rt_put(rt);
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700718 stats->tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 goto tx_error_icmp;
720 }
721 tdev = rt->u.dst.dev;
722
723 if (tdev == dev) {
724 ip_rt_put(rt);
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700725 stats->collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 goto tx_error;
727 }
728
729 if (tiph->frag_off)
730 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
731 else
Eric Dumazetadf30902009-06-02 05:19:30 +0000732 mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
734 if (mtu < 68) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700735 stats->collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 ip_rt_put(rt);
737 goto tx_error;
738 }
739 if (mtu < IPV6_MIN_MTU)
740 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +0000741 if (tunnel->parms.iph.daddr && skb_dst(skb))
742 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
744 if (skb->len > mtu) {
745 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
746 ip_rt_put(rt);
747 goto tx_error;
748 }
749
750 if (tunnel->err_count > 0) {
Wei Yongjunbb800872009-02-24 23:37:19 -0800751 if (time_before(jiffies,
752 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 tunnel->err_count--;
754 dst_link_failure(skb);
755 } else
756 tunnel->err_count = 0;
757 }
758
759 /*
760 * Okay, now see if we can stuff it in the buffer as-is.
761 */
762 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
763
Patrick McHardycfbba492007-07-09 15:33:40 -0700764 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
765 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
767 if (!new_skb) {
768 ip_rt_put(rt);
Eric Dumazet0bfbedb2009-10-05 00:11:22 -0700769 txq->tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000771 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 }
773 if (skb->sk)
774 skb_set_owner_w(new_skb, skb->sk);
775 dev_kfree_skb(skb);
776 skb = new_skb;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700777 iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 }
779
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700780 skb->transport_header = skb->network_header;
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700781 skb_push(skb, sizeof(struct iphdr));
782 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800784 IPCB(skb)->flags = 0;
Eric Dumazetadf30902009-06-02 05:19:30 +0000785 skb_dst_drop(skb);
786 skb_dst_set(skb, &rt->u.dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
788 /*
789 * Push down and install the IPIP header.
790 */
791
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700792 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 iph->version = 4;
794 iph->ihl = sizeof(struct iphdr)>>2;
795 if (mtu > IPV6_MIN_MTU)
Sascha Hlusiak8945a802009-08-28 23:53:53 -0700796 iph->frag_off = tiph->frag_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 else
798 iph->frag_off = 0;
799
800 iph->protocol = IPPROTO_IPV6;
801 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
802 iph->daddr = rt->rt_dst;
803 iph->saddr = rt->rt_src;
804
805 if ((iph->ttl = tiph->ttl) == 0)
806 iph->ttl = iph6->hop_limit;
807
808 nf_reset(skb);
809
810 IPTUNNEL_XMIT();
Patrick McHardy6ed10652009-06-23 06:03:08 +0000811 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
813tx_error_icmp:
814 dst_link_failure(skb);
815tx_error:
816 stats->tx_errors++;
817 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000818 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819}
820
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800821static void ipip6_tunnel_bind_dev(struct net_device *dev)
822{
823 struct net_device *tdev = NULL;
824 struct ip_tunnel *tunnel;
825 struct iphdr *iph;
826
827 tunnel = netdev_priv(dev);
828 iph = &tunnel->parms.iph;
829
830 if (iph->daddr) {
831 struct flowi fl = { .nl_u = { .ip4_u =
832 { .daddr = iph->daddr,
833 .saddr = iph->saddr,
834 .tos = RT_TOS(iph->tos) } },
835 .oif = tunnel->parms.link,
836 .proto = IPPROTO_IPV6 };
837 struct rtable *rt;
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700838 if (!ip_route_output_key(dev_net(dev), &rt, &fl)) {
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800839 tdev = rt->u.dst.dev;
840 ip_rt_put(rt);
841 }
842 dev->flags |= IFF_POINTOPOINT;
843 }
844
845 if (!tdev && tunnel->parms.link)
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700846 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800847
848 if (tdev) {
849 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
850 dev->mtu = tdev->mtu - sizeof(struct iphdr);
851 if (dev->mtu < IPV6_MIN_MTU)
852 dev->mtu = IPV6_MIN_MTU;
853 }
854 dev->iflink = tunnel->parms.link;
855}
856
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857static int
858ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
859{
860 int err = 0;
861 struct ip_tunnel_parm p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400862 struct ip_tunnel_prl prl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 struct ip_tunnel *t;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700864 struct net *net = dev_net(dev);
865 struct sit_net *sitn = net_generic(net, sit_net_id);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000866#ifdef CONFIG_IPV6_SIT_6RD
867 struct ip_tunnel_6rd ip6rd;
868#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
870 switch (cmd) {
871 case SIOCGETTUNNEL:
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000872#ifdef CONFIG_IPV6_SIT_6RD
873 case SIOCGET6RD:
874#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 t = NULL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700876 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
878 err = -EFAULT;
879 break;
880 }
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700881 t = ipip6_tunnel_locate(net, &p, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 }
883 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -0800884 t = netdev_priv(dev);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000885
886 err = -EFAULT;
887 if (cmd == SIOCGETTUNNEL) {
888 memcpy(&p, &t->parms, sizeof(p));
889 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
890 sizeof(p)))
891 goto done;
892#ifdef CONFIG_IPV6_SIT_6RD
893 } else {
894 ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix);
895 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
896 ip6rd.prefixlen = t->ip6rd.prefixlen;
897 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
898 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
899 sizeof(ip6rd)))
900 goto done;
901#endif
902 }
903 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 break;
905
906 case SIOCADDTUNNEL:
907 case SIOCCHGTUNNEL:
908 err = -EPERM;
909 if (!capable(CAP_NET_ADMIN))
910 goto done;
911
912 err = -EFAULT;
913 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
914 goto done;
915
916 err = -EINVAL;
917 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
918 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
919 goto done;
920 if (p.iph.ttl)
921 p.iph.frag_off |= htons(IP_DF);
922
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700923 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700925 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 if (t != NULL) {
927 if (t->dev != dev) {
928 err = -EEXIST;
929 break;
930 }
931 } else {
932 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
933 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
934 err = -EINVAL;
935 break;
936 }
Patrick McHardy2941a482006-01-08 22:05:26 -0800937 t = netdev_priv(dev);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700938 ipip6_tunnel_unlink(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 t->parms.iph.saddr = p.iph.saddr;
940 t->parms.iph.daddr = p.iph.daddr;
941 memcpy(dev->dev_addr, &p.iph.saddr, 4);
942 memcpy(dev->broadcast, &p.iph.daddr, 4);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700943 ipip6_tunnel_link(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 netdev_state_change(dev);
945 }
946 }
947
948 if (t) {
949 err = 0;
950 if (cmd == SIOCCHGTUNNEL) {
951 t->parms.iph.ttl = p.iph.ttl;
952 t->parms.iph.tos = p.iph.tos;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800953 if (t->parms.link != p.link) {
954 t->parms.link = p.link;
955 ipip6_tunnel_bind_dev(dev);
956 netdev_state_change(dev);
957 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 }
959 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
960 err = -EFAULT;
961 } else
962 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
963 break;
964
965 case SIOCDELTUNNEL:
966 err = -EPERM;
967 if (!capable(CAP_NET_ADMIN))
968 goto done;
969
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700970 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 err = -EFAULT;
972 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
973 goto done;
974 err = -ENOENT;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700975 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 goto done;
977 err = -EPERM;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700978 if (t == netdev_priv(sitn->fb_tunnel_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 goto done;
980 dev = t->dev;
981 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -0800982 unregister_netdevice(dev);
983 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 break;
985
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900986 case SIOCGETPRL:
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700987 err = -EINVAL;
988 if (dev == sitn->fb_tunnel_dev)
989 goto done;
990 err = -ENOENT;
991 if (!(t = netdev_priv(dev)))
992 goto done;
993 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
994 break;
995
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400996 case SIOCADDPRL:
997 case SIOCDELPRL:
998 case SIOCCHGPRL:
999 err = -EPERM;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001000 if (!capable(CAP_NET_ADMIN))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001001 goto done;
1002 err = -EINVAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001003 if (dev == sitn->fb_tunnel_dev)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001004 goto done;
1005 err = -EFAULT;
1006 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1007 goto done;
1008 err = -ENOENT;
1009 if (!(t = netdev_priv(dev)))
1010 goto done;
1011
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001012 switch (cmd) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001013 case SIOCDELPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001014 err = ipip6_tunnel_del_prl(t, &prl);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001015 break;
1016 case SIOCADDPRL:
1017 case SIOCCHGPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001018 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001019 break;
1020 }
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001021 netdev_state_change(dev);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001022 break;
1023
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001024#ifdef CONFIG_IPV6_SIT_6RD
1025 case SIOCADD6RD:
1026 case SIOCCHG6RD:
1027 case SIOCDEL6RD:
1028 err = -EPERM;
1029 if (!capable(CAP_NET_ADMIN))
1030 goto done;
1031
1032 err = -EFAULT;
1033 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1034 sizeof(ip6rd)))
1035 goto done;
1036
1037 t = netdev_priv(dev);
1038
1039 if (cmd != SIOCDEL6RD) {
1040 struct in6_addr prefix;
1041 __be32 relay_prefix;
1042
1043 err = -EINVAL;
1044 if (ip6rd.relay_prefixlen > 32 ||
1045 ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64)
1046 goto done;
1047
1048 ipv6_addr_prefix(&prefix, &ip6rd.prefix,
1049 ip6rd.prefixlen);
1050 if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
1051 goto done;
YOSHIFUJI Hideaki / 吉藤英明91b2a3f2009-10-11 03:45:13 +00001052 if (ip6rd.relay_prefixlen)
1053 relay_prefix = ip6rd.relay_prefix &
1054 htonl(0xffffffffUL <<
1055 (32 - ip6rd.relay_prefixlen));
1056 else
1057 relay_prefix = 0;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001058 if (relay_prefix != ip6rd.relay_prefix)
1059 goto done;
1060
1061 ipv6_addr_copy(&t->ip6rd.prefix, &prefix);
1062 t->ip6rd.relay_prefix = relay_prefix;
1063 t->ip6rd.prefixlen = ip6rd.prefixlen;
1064 t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen;
1065 } else
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001066 ipip6_tunnel_clone_6rd(dev, sitn);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001067
1068 err = 0;
1069 break;
1070#endif
1071
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 default:
1073 err = -EINVAL;
1074 }
1075
1076done:
1077 return err;
1078}
1079
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1081{
1082 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1083 return -EINVAL;
1084 dev->mtu = new_mtu;
1085 return 0;
1086}
1087
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001088static const struct net_device_ops ipip6_netdev_ops = {
1089 .ndo_uninit = ipip6_tunnel_uninit,
1090 .ndo_start_xmit = ipip6_tunnel_xmit,
1091 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1092 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1093};
1094
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095static void ipip6_tunnel_setup(struct net_device *dev)
1096{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001097 dev->netdev_ops = &ipip6_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 dev->destructor = free_netdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099
1100 dev->type = ARPHRD_SIT;
1101 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
Kris Katterjohn46f25df2006-01-05 16:35:42 -08001102 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 dev->flags = IFF_NOARP;
Sascha Hlusiakf2ba0252009-07-11 20:30:52 -07001104 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 dev->iflink = 0;
1106 dev->addr_len = 4;
Pavel Emelyanov7a971462008-04-16 01:17:18 -07001107 dev->features |= NETIF_F_NETNS_LOCAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108}
1109
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001110static void ipip6_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001112 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113
1114 tunnel->dev = dev;
1115 strcpy(tunnel->parms.name, dev->name);
1116
1117 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1118 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1119
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001120 ipip6_tunnel_bind_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121}
1122
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001123static void ipip6_fb_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124{
Patrick McHardy2941a482006-01-08 22:05:26 -08001125 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 struct iphdr *iph = &tunnel->parms.iph;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001127 struct net *net = dev_net(dev);
1128 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
1130 tunnel->dev = dev;
1131 strcpy(tunnel->parms.name, dev->name);
1132
1133 iph->version = 4;
1134 iph->protocol = IPPROTO_IPV6;
1135 iph->ihl = 5;
1136 iph->ttl = 64;
1137
1138 dev_hold(dev);
Pavel Emelyanov29182172008-04-16 01:16:38 -07001139 sitn->tunnels_wc[0] = tunnel;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140}
1141
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001142static struct xfrm_tunnel sit_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 .handler = ipip6_rcv,
1144 .err_handler = ipip6_err,
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001145 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146};
1147
Eric Dumazet62808f92009-10-28 04:37:43 +00001148static void sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001149{
1150 int prio;
1151
1152 for (prio = 1; prio < 4; prio++) {
1153 int h;
1154 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet62808f92009-10-28 04:37:43 +00001155 struct ip_tunnel *t = sitn->tunnels[prio][h];
1156
1157 while (t != NULL) {
1158 unregister_netdevice_queue(t->dev, head);
1159 t = t->next;
1160 }
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001161 }
1162 }
1163}
1164
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001165static int sit_init_net(struct net *net)
1166{
1167 int err;
1168 struct sit_net *sitn;
1169
1170 err = -ENOMEM;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001171 sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001172 if (sitn == NULL)
1173 goto err_alloc;
1174
1175 err = net_assign_generic(net, sit_net_id, sitn);
1176 if (err < 0)
1177 goto err_assign;
1178
Pavel Emelyanov29182172008-04-16 01:16:38 -07001179 sitn->tunnels[0] = sitn->tunnels_wc;
1180 sitn->tunnels[1] = sitn->tunnels_l;
1181 sitn->tunnels[2] = sitn->tunnels_r;
1182 sitn->tunnels[3] = sitn->tunnels_r_l;
1183
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001184 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1185 ipip6_tunnel_setup);
1186 if (!sitn->fb_tunnel_dev) {
1187 err = -ENOMEM;
1188 goto err_alloc_dev;
1189 }
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001190 dev_net_set(sitn->fb_tunnel_dev, net);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001191
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001192 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001193 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001194
1195 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1196 goto err_reg_dev;
1197
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001198 return 0;
1199
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001200err_reg_dev:
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001201 dev_put(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001202 free_netdev(sitn->fb_tunnel_dev);
1203err_alloc_dev:
1204 /* nothing */
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001205err_assign:
1206 kfree(sitn);
1207err_alloc:
1208 return err;
1209}
1210
1211static void sit_exit_net(struct net *net)
1212{
1213 struct sit_net *sitn;
Eric Dumazet62808f92009-10-28 04:37:43 +00001214 LIST_HEAD(list);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001215
1216 sitn = net_generic(net, sit_net_id);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001217 rtnl_lock();
Eric Dumazet62808f92009-10-28 04:37:43 +00001218 sit_destroy_tunnels(sitn, &list);
1219 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1220 unregister_netdevice_many(&list);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001221 rtnl_unlock();
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001222 kfree(sitn);
1223}
1224
1225static struct pernet_operations sit_net_ops = {
1226 .init = sit_init_net,
1227 .exit = sit_exit_net,
1228};
1229
Adrian Bunk89c89452006-11-20 16:56:48 -08001230static void __exit sit_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231{
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001232 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001233
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001234 unregister_pernet_gen_device(sit_net_id, &sit_net_ops);
Eric Dumazetef9a9d12009-10-23 17:51:26 +00001235 rcu_barrier(); /* Wait for completion of call_rcu()'s */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236}
1237
Adrian Bunk89c89452006-11-20 16:56:48 -08001238static int __init sit_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239{
1240 int err;
1241
1242 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1243
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001244 if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 printk(KERN_INFO "sit init: Can't add protocol\n");
1246 return -EAGAIN;
1247 }
1248
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001249 err = register_pernet_gen_device(&sit_net_id, &sit_net_ops);
1250 if (err < 0)
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001251 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001252
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254}
Joerg Roedel989e5b92006-10-10 14:47:44 -07001255
1256module_init(sit_init);
1257module_exit(sit_cleanup);
Jan Dittmer39c85082006-10-13 15:05:53 -07001258MODULE_LICENSE("GPL");
Patrick McHardydaccff02006-11-05 15:47:04 -08001259MODULE_ALIAS("sit0");