blob: 68e52308e5520f7180e22c0230aea51133fad265 [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
Sascha Hlusiak64506922009-05-19 12:56:52 +000018 * Sascha Hlusiak <mail@saschahlusiak.de>: stateless autoconf for isatap
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 */
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/module.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080022#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/socket.h>
26#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/net.h>
28#include <linux/in6.h>
29#include <linux/netdevice.h>
30#include <linux/if_arp.h>
31#include <linux/icmp.h>
32#include <asm/uaccess.h>
33#include <linux/init.h>
34#include <linux/netfilter_ipv4.h>
Kris Katterjohn46f25df2006-01-05 16:35:42 -080035#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#include <net/sock.h>
38#include <net/snmp.h>
39
40#include <net/ipv6.h>
41#include <net/protocol.h>
42#include <net/transp_v6.h>
43#include <net/ip6_fib.h>
44#include <net/ip6_route.h>
45#include <net/ndisc.h>
46#include <net/addrconf.h>
47#include <net/ip.h>
48#include <net/udp.h>
49#include <net/icmp.h>
50#include <net/ipip.h>
51#include <net/inet_ecn.h>
52#include <net/xfrm.h>
53#include <net/dsfield.h>
Pavel Emelyanov8190d902008-04-16 01:15:17 -070054#include <net/net_namespace.h>
55#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57/*
58 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
59
60 For comments look at net/ipv4/ip_gre.c --ANK
61 */
62
63#define HASH_SIZE 16
Al Viroe69a4adc2006-11-14 20:56:00 -080064#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Stephen Hemminger1326c3d2008-11-20 20:33:56 -080066static void ipip6_fb_tunnel_init(struct net_device *dev);
67static void ipip6_tunnel_init(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068static void ipip6_tunnel_setup(struct net_device *dev);
69
Pavel Emelyanov8190d902008-04-16 01:15:17 -070070static int sit_net_id;
71struct sit_net {
Pavel Emelyanov29182172008-04-16 01:16:38 -070072 struct ip_tunnel *tunnels_r_l[HASH_SIZE];
73 struct ip_tunnel *tunnels_r[HASH_SIZE];
74 struct ip_tunnel *tunnels_l[HASH_SIZE];
75 struct ip_tunnel *tunnels_wc[1];
76 struct ip_tunnel **tunnels[4];
77
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -070078 struct net_device *fb_tunnel_dev;
Pavel Emelyanov8190d902008-04-16 01:15:17 -070079};
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081static DEFINE_RWLOCK(ipip6_lock);
82
Pavel Emelyanovca8def12008-04-16 01:15:39 -070083static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +000084 struct net_device *dev, __be32 remote, __be32 local)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
86 unsigned h0 = HASH(remote);
87 unsigned h1 = HASH(local);
88 struct ip_tunnel *t;
Pavel Emelyanov29182172008-04-16 01:16:38 -070089 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Pavel Emelyanov29182172008-04-16 01:16:38 -070091 for (t = sitn->tunnels_r_l[h0^h1]; t; t = t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +000093 remote == t->parms.iph.daddr &&
94 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
95 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 return t;
97 }
Pavel Emelyanov29182172008-04-16 01:16:38 -070098 for (t = sitn->tunnels_r[h0]; t; t = t->next) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +000099 if (remote == t->parms.iph.daddr &&
100 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
101 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 return t;
103 }
Pavel Emelyanov29182172008-04-16 01:16:38 -0700104 for (t = sitn->tunnels_l[h1]; t; t = t->next) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000105 if (local == t->parms.iph.saddr &&
106 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
107 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return t;
109 }
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000110 t = sitn->tunnels_wc[0];
111 if ((t != NULL) && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return t;
113 return NULL;
114}
115
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700116static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn,
117 struct ip_tunnel_parm *parms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118{
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900119 __be32 remote = parms->iph.daddr;
120 __be32 local = parms->iph.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 unsigned h = 0;
122 int prio = 0;
123
124 if (remote) {
125 prio |= 2;
126 h ^= HASH(remote);
127 }
128 if (local) {
129 prio |= 1;
130 h ^= HASH(local);
131 }
Pavel Emelyanov29182172008-04-16 01:16:38 -0700132 return &sitn->tunnels[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
134
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700135static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn,
136 struct ip_tunnel *t)
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900137{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700138 return __ipip6_bucket(sitn, &t->parms);
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900139}
140
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700141static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
143 struct ip_tunnel **tp;
144
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700145 for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 if (t == *tp) {
147 write_lock_bh(&ipip6_lock);
148 *tp = t->next;
149 write_unlock_bh(&ipip6_lock);
150 break;
151 }
152 }
153}
154
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700155static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700157 struct ip_tunnel **tp = ipip6_bucket(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159 t->next = *tp;
160 write_lock_bh(&ipip6_lock);
161 *tp = t;
162 write_unlock_bh(&ipip6_lock);
163}
164
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700165static struct ip_tunnel * ipip6_tunnel_locate(struct net *net,
166 struct ip_tunnel_parm *parms, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167{
Al Viroe69a4adc2006-11-14 20:56:00 -0800168 __be32 remote = parms->iph.daddr;
169 __be32 local = parms->iph.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 struct ip_tunnel *t, **tp, *nt;
171 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 char name[IFNAMSIZ];
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700173 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700175 for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000176 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000177 remote == t->parms.iph.daddr &&
178 parms->link == t->parms.link) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000179 if (create)
180 return NULL;
181 else
182 return t;
183 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185 if (!create)
186 goto failed;
187
188 if (parms->name[0])
189 strlcpy(name, parms->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800190 else
191 sprintf(name, "sit%%d");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
193 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
194 if (dev == NULL)
195 return NULL;
196
Pavel Emelyanov7a971462008-04-16 01:17:18 -0700197 dev_net_set(dev, net);
198
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800199 if (strchr(name, '%')) {
200 if (dev_alloc_name(dev, name) < 0)
201 goto failed_free;
202 }
203
Patrick McHardy2941a482006-01-08 22:05:26 -0800204 nt = netdev_priv(dev);
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 nt->parms = *parms;
Bjørn Mork1b1d8f72009-03-18 18:56:54 -0700207 ipip6_tunnel_init(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100209 if (parms->i_flags & SIT_ISATAP)
210 dev->priv_flags |= IFF_ISATAP;
211
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800212 if (register_netdevice(dev) < 0)
213 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215 dev_hold(dev);
216
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700217 ipip6_tunnel_link(sitn, nt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 return nt;
219
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800220failed_free:
221 free_netdev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222failed:
223 return NULL;
224}
225
Sascha Hlusiak64506922009-05-19 12:56:52 +0000226static void ipip6_tunnel_rs_timer(unsigned long data)
227{
228 struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *) data;
229 struct inet6_dev *ifp;
230 struct inet6_ifaddr *addr;
231
232 spin_lock(&p->lock);
233 ifp = __in6_dev_get(p->tunnel->dev);
234
235 read_lock_bh(&ifp->lock);
236 for (addr = ifp->addr_list; addr; addr = addr->if_next) {
237 struct in6_addr rtr;
238
239 if (!(ipv6_addr_type(&addr->addr) & IPV6_ADDR_LINKLOCAL))
240 continue;
241
242 /* Send RS to guessed linklocal address of router
243 *
244 * Better: send to ff02::2 encapsuled in unicast directly
245 * to router-v4 instead of guessing the v6 address.
246 *
247 * Cisco/Windows seem to not set the u/l bit correctly,
248 * so we won't guess right.
249 */
250 ipv6_addr_set(&rtr, htonl(0xFE800000), 0, 0, 0);
251 if (!__ipv6_isatap_ifid(rtr.s6_addr + 8,
252 p->addr)) {
253 ndisc_send_rs(p->tunnel->dev, &addr->addr, &rtr);
254 }
255 }
256 read_unlock_bh(&ifp->lock);
257
258 mod_timer(&p->rs_timer, jiffies + HZ * p->rs_delay);
259 spin_unlock(&p->lock);
260
261 return;
262}
263
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400264static struct ip_tunnel_prl_entry *
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900265__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400266{
267 struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL;
268
269 for (p = t->prl; p; p = p->next)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900270 if (p->addr == addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400271 break;
272 return p;
273
274}
275
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700276static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
277 struct ip_tunnel_prl __user *a)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900278{
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700279 struct ip_tunnel_prl kprl, *kp;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900280 struct ip_tunnel_prl_entry *prl;
281 unsigned int cmax, c = 0, ca, len;
282 int ret = 0;
283
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700284 if (copy_from_user(&kprl, a, sizeof(kprl)))
285 return -EFAULT;
286 cmax = kprl.datalen / sizeof(kprl);
287 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900288 cmax = 1;
289
290 /* For simple GET or for root users,
291 * we try harder to allocate.
292 */
293 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
294 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
295 NULL;
296
297 read_lock(&ipip6_lock);
298
299 ca = t->prl_count < cmax ? t->prl_count : cmax;
300
301 if (!kp) {
302 /* We don't try hard to allocate much memory for
303 * non-root users.
304 * For root users, retry allocating enough memory for
305 * the answer.
306 */
307 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
308 if (!kp) {
309 ret = -ENOMEM;
310 goto out;
311 }
312 }
313
314 c = 0;
315 for (prl = t->prl; prl; prl = prl->next) {
316 if (c > cmax)
317 break;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700318 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900319 continue;
320 kp[c].addr = prl->addr;
321 kp[c].flags = prl->flags;
Sascha Hlusiak64506922009-05-19 12:56:52 +0000322 kp[c].rs_delay = prl->rs_delay;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900323 c++;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700324 if (kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900325 break;
326 }
327out:
328 read_unlock(&ipip6_lock);
329
330 len = sizeof(*kp) * c;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700331 ret = 0;
332 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
333 ret = -EFAULT;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900334
335 kfree(kp);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900336
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700337 return ret;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900338}
339
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400340static int
341ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
342{
343 struct ip_tunnel_prl_entry *p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900344 int err = 0;
345
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900346 if (a->addr == htonl(INADDR_ANY))
347 return -EINVAL;
348
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900349 write_lock(&ipip6_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400350
351 for (p = t->prl; p; p = p->next) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900352 if (p->addr == a->addr) {
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900353 if (chg)
354 goto update;
355 err = -EEXIST;
356 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400357 }
358 }
359
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900360 if (chg) {
361 err = -ENXIO;
362 goto out;
363 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400364
365 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900366 if (!p) {
367 err = -ENOBUFS;
368 goto out;
369 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400370
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400371 p->next = t->prl;
Sascha Hlusiak64506922009-05-19 12:56:52 +0000372 p->tunnel = t;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400373 t->prl = p;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900374 t->prl_count++;
Sascha Hlusiak64506922009-05-19 12:56:52 +0000375
376 spin_lock_init(&p->lock);
377 setup_timer(&p->rs_timer, ipip6_tunnel_rs_timer, (unsigned long) p);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900378update:
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900379 p->addr = a->addr;
380 p->flags = a->flags;
Sascha Hlusiak64506922009-05-19 12:56:52 +0000381 p->rs_delay = a->rs_delay;
382 if (p->rs_delay == 0)
383 p->rs_delay = IPTUNNEL_RS_DEFAULT_DELAY;
384 spin_lock(&p->lock);
385 del_timer(&p->rs_timer);
386 if (p->flags & PRL_DEFAULT)
387 mod_timer(&p->rs_timer, jiffies + 1);
388 spin_unlock(&p->lock);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900389out:
390 write_unlock(&ipip6_lock);
391 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400392}
393
394static int
395ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
396{
397 struct ip_tunnel_prl_entry *x, **p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900398 int err = 0;
399
400 write_lock(&ipip6_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400401
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900402 if (a && a->addr != htonl(INADDR_ANY)) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400403 for (p = &t->prl; *p; p = &(*p)->next) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900404 if ((*p)->addr == a->addr) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400405 x = *p;
406 *p = x->next;
Sascha Hlusiak64506922009-05-19 12:56:52 +0000407 spin_lock(&x->lock);
408 del_timer(&x->rs_timer);
409 spin_unlock(&x->lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400410 kfree(x);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900411 t->prl_count--;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900412 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400413 }
414 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900415 err = -ENXIO;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400416 } else {
417 while (t->prl) {
418 x = t->prl;
419 t->prl = t->prl->next;
Sascha Hlusiak64506922009-05-19 12:56:52 +0000420 spin_lock(&x->lock);
421 del_timer(&x->rs_timer);
422 spin_unlock(&x->lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400423 kfree(x);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900424 t->prl_count--;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400425 }
426 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900427out:
428 write_unlock(&ipip6_lock);
Sascha Hlusiak4b27960172009-05-19 12:56:50 +0000429 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400430}
431
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400432static int
433isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
434{
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900435 struct ip_tunnel_prl_entry *p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400436 int ok = 1;
437
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900438 read_lock(&ipip6_lock);
439 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400440 if (p) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900441 if (p->flags & PRL_DEFAULT)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400442 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
443 else
444 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
445 } else {
446 struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
447 if (ipv6_addr_is_isatap(addr6) &&
448 (addr6->s6_addr32[3] == iph->saddr) &&
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400449 ipv6_chk_prefix(addr6, t->dev))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400450 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
451 else
452 ok = 0;
453 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900454 read_unlock(&ipip6_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400455 return ok;
456}
457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458static void ipip6_tunnel_uninit(struct net_device *dev)
459{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700460 struct net *net = dev_net(dev);
461 struct sit_net *sitn = net_generic(net, sit_net_id);
462
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700463 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 write_lock_bh(&ipip6_lock);
Pavel Emelyanov29182172008-04-16 01:16:38 -0700465 sitn->tunnels_wc[0] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 write_unlock_bh(&ipip6_lock);
467 dev_put(dev);
468 } else {
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700469 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
YOSHIFUJI Hideaki02e10b92008-04-10 15:41:27 +0900470 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 dev_put(dev);
472 }
473}
474
475
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800476static int ipip6_err(struct sk_buff *skb, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
Rami Rosen071f92d2008-05-21 17:47:54 -0700479/* All the routers (except for Linux) return only
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 8 bytes of packet payload. It means, that precise relaying of
481 ICMP in the real Internet is absolutely infeasible.
482 */
483 struct iphdr *iph = (struct iphdr*)skb->data;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300484 const int type = icmp_hdr(skb)->type;
485 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 struct ip_tunnel *t;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800487 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 switch (type) {
490 default:
491 case ICMP_PARAMETERPROB:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800492 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 case ICMP_DEST_UNREACH:
495 switch (code) {
496 case ICMP_SR_FAILED:
497 case ICMP_PORT_UNREACH:
498 /* Impossible event. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800499 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 case ICMP_FRAG_NEEDED:
501 /* Soft state for pmtu is maintained by IP core. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800502 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 default:
504 /* All others are translated to HOST_UNREACH.
505 rfc2003 contains "deep thoughts" about NET_UNREACH,
506 I believe they are just ether pollution. --ANK
507 */
508 break;
509 }
510 break;
511 case ICMP_TIME_EXCEEDED:
512 if (code != ICMP_EXC_TTL)
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800513 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 break;
515 }
516
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800517 err = -ENOENT;
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 read_lock(&ipip6_lock);
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000520 t = ipip6_tunnel_lookup(dev_net(skb->dev),
521 skb->dev,
522 iph->daddr,
523 iph->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 if (t == NULL || t->parms.iph.daddr == 0)
525 goto out;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800526
527 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
529 goto out;
530
Wei Yongjunbb800872009-02-24 23:37:19 -0800531 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 t->err_count++;
533 else
534 t->err_count = 1;
535 t->err_time = jiffies;
536out:
537 read_unlock(&ipip6_lock);
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800538 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539}
540
541static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
542{
543 if (INET_ECN_is_ce(iph->tos))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700544 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545}
546
547static int ipip6_rcv(struct sk_buff *skb)
548{
549 struct iphdr *iph;
550 struct ip_tunnel *tunnel;
551
552 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
553 goto out;
554
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700555 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557 read_lock(&ipip6_lock);
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000558 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
559 iph->saddr, iph->daddr);
560 if (tunnel != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700562 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700563 skb_reset_network_header(skb);
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800564 IPCB(skb)->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 skb->protocol = htons(ETH_P_IPV6);
566 skb->pkt_type = PACKET_HOST;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100567
568 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400569 !isatap_chksrc(skb, iph, tunnel)) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700570 tunnel->dev->stats.rx_errors++;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100571 read_unlock(&ipip6_lock);
572 kfree_skb(skb);
573 return 0;
574 }
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700575 tunnel->dev->stats.rx_packets++;
576 tunnel->dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 skb->dev = tunnel->dev;
Eric Dumazetadf30902009-06-02 05:19:30 +0000578 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 nf_reset(skb);
580 ipip6_ecn_decapsulate(iph, skb);
581 netif_rx(skb);
582 read_unlock(&ipip6_lock);
583 return 0;
584 }
585
Herbert Xu45af08b2006-04-05 22:31:19 -0700586 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 read_unlock(&ipip6_lock);
588out:
David S. Miller36ca34c2008-05-08 23:40:26 -0700589 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 return 0;
591}
592
593/* Returns the embedded IPv4 address if the IPv6 address
594 comes from 6to4 (RFC 3056) addr space */
595
Al Viroe69a4adc2006-11-14 20:56:00 -0800596static inline __be32 try_6to4(struct in6_addr *v6dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597{
Al Viroe69a4adc2006-11-14 20:56:00 -0800598 __be32 dst = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600 if (v6dst->s6_addr16[0] == htons(0x2002)) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900601 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 memcpy(&dst, &v6dst->s6_addr16[1], 4);
603 }
604 return dst;
605}
606
607/*
608 * This function assumes it is being called from dev_queue_xmit()
609 * and that skb is filled properly by that function.
610 */
611
612static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
613{
Patrick McHardy2941a482006-01-08 22:05:26 -0800614 struct ip_tunnel *tunnel = netdev_priv(dev);
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700615 struct net_device_stats *stats = &tunnel->dev->stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 struct iphdr *tiph = &tunnel->parms.iph;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700617 struct ipv6hdr *iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 u8 tos = tunnel->parms.iph.tos;
619 struct rtable *rt; /* Route to the other host */
620 struct net_device *tdev; /* Device to other host */
621 struct iphdr *iph; /* Our new IP header */
Chuck Leverc2636b42007-10-23 21:07:32 -0700622 unsigned int max_headroom; /* The extra header space needed */
Al Viroe69a4adc2006-11-14 20:56:00 -0800623 __be32 dst = tiph->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 int mtu;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900625 struct in6_addr *addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 int addr_type;
627
628 if (tunnel->recursion++) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700629 stats->collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 goto tx_error;
631 }
632
633 if (skb->protocol != htons(ETH_P_IPV6))
634 goto tx_error;
635
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100636 /* ISATAP (RFC4214) - must come before 6to4 */
637 if (dev->priv_flags & IFF_ISATAP) {
638 struct neighbour *neigh = NULL;
639
Eric Dumazetadf30902009-06-02 05:19:30 +0000640 if (skb_dst(skb))
641 neigh = skb_dst(skb)->neighbour;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100642
643 if (neigh == NULL) {
644 if (net_ratelimit())
645 printk(KERN_DEBUG "sit: nexthop == NULL\n");
646 goto tx_error;
647 }
648
649 addr6 = (struct in6_addr*)&neigh->primary_key;
650 addr_type = ipv6_addr_type(addr6);
651
652 if ((addr_type & IPV6_ADDR_UNICAST) &&
653 ipv6_addr_is_isatap(addr6))
654 dst = addr6->s6_addr32[3];
655 else
656 goto tx_error;
657 }
658
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 if (!dst)
660 dst = try_6to4(&iph6->daddr);
661
662 if (!dst) {
663 struct neighbour *neigh = NULL;
664
Eric Dumazetadf30902009-06-02 05:19:30 +0000665 if (skb_dst(skb))
666 neigh = skb_dst(skb)->neighbour;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668 if (neigh == NULL) {
669 if (net_ratelimit())
670 printk(KERN_DEBUG "sit: nexthop == NULL\n");
671 goto tx_error;
672 }
673
674 addr6 = (struct in6_addr*)&neigh->primary_key;
675 addr_type = ipv6_addr_type(addr6);
676
677 if (addr_type == IPV6_ADDR_ANY) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700678 addr6 = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 addr_type = ipv6_addr_type(addr6);
680 }
681
682 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
683 goto tx_error_icmp;
684
685 dst = addr6->s6_addr32[3];
686 }
687
688 {
689 struct flowi fl = { .nl_u = { .ip4_u =
690 { .daddr = dst,
691 .saddr = tiph->saddr,
692 .tos = RT_TOS(tos) } },
693 .oif = tunnel->parms.link,
694 .proto = IPPROTO_IPV6 };
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700695 if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700696 stats->tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 goto tx_error_icmp;
698 }
699 }
700 if (rt->rt_type != RTN_UNICAST) {
701 ip_rt_put(rt);
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700702 stats->tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 goto tx_error_icmp;
704 }
705 tdev = rt->u.dst.dev;
706
707 if (tdev == dev) {
708 ip_rt_put(rt);
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700709 stats->collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 goto tx_error;
711 }
712
713 if (tiph->frag_off)
714 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
715 else
Eric Dumazetadf30902009-06-02 05:19:30 +0000716 mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718 if (mtu < 68) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700719 stats->collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 ip_rt_put(rt);
721 goto tx_error;
722 }
723 if (mtu < IPV6_MIN_MTU)
724 mtu = IPV6_MIN_MTU;
Eric Dumazetadf30902009-06-02 05:19:30 +0000725 if (tunnel->parms.iph.daddr && skb_dst(skb))
726 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
728 if (skb->len > mtu) {
729 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
730 ip_rt_put(rt);
731 goto tx_error;
732 }
733
734 if (tunnel->err_count > 0) {
Wei Yongjunbb800872009-02-24 23:37:19 -0800735 if (time_before(jiffies,
736 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 tunnel->err_count--;
738 dst_link_failure(skb);
739 } else
740 tunnel->err_count = 0;
741 }
742
743 /*
744 * Okay, now see if we can stuff it in the buffer as-is.
745 */
746 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
747
Patrick McHardycfbba492007-07-09 15:33:40 -0700748 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
749 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
751 if (!new_skb) {
752 ip_rt_put(rt);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900753 stats->tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 dev_kfree_skb(skb);
755 tunnel->recursion--;
756 return 0;
757 }
758 if (skb->sk)
759 skb_set_owner_w(new_skb, skb->sk);
760 dev_kfree_skb(skb);
761 skb = new_skb;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700762 iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 }
764
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700765 skb->transport_header = skb->network_header;
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700766 skb_push(skb, sizeof(struct iphdr));
767 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800769 IPCB(skb)->flags = 0;
Eric Dumazetadf30902009-06-02 05:19:30 +0000770 skb_dst_drop(skb);
771 skb_dst_set(skb, &rt->u.dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
773 /*
774 * Push down and install the IPIP header.
775 */
776
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700777 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 iph->version = 4;
779 iph->ihl = sizeof(struct iphdr)>>2;
780 if (mtu > IPV6_MIN_MTU)
781 iph->frag_off = htons(IP_DF);
782 else
783 iph->frag_off = 0;
784
785 iph->protocol = IPPROTO_IPV6;
786 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
787 iph->daddr = rt->rt_dst;
788 iph->saddr = rt->rt_src;
789
790 if ((iph->ttl = tiph->ttl) == 0)
791 iph->ttl = iph6->hop_limit;
792
793 nf_reset(skb);
794
795 IPTUNNEL_XMIT();
796 tunnel->recursion--;
797 return 0;
798
799tx_error_icmp:
800 dst_link_failure(skb);
801tx_error:
802 stats->tx_errors++;
803 dev_kfree_skb(skb);
804 tunnel->recursion--;
805 return 0;
806}
807
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800808static void ipip6_tunnel_bind_dev(struct net_device *dev)
809{
810 struct net_device *tdev = NULL;
811 struct ip_tunnel *tunnel;
812 struct iphdr *iph;
813
814 tunnel = netdev_priv(dev);
815 iph = &tunnel->parms.iph;
816
817 if (iph->daddr) {
818 struct flowi fl = { .nl_u = { .ip4_u =
819 { .daddr = iph->daddr,
820 .saddr = iph->saddr,
821 .tos = RT_TOS(iph->tos) } },
822 .oif = tunnel->parms.link,
823 .proto = IPPROTO_IPV6 };
824 struct rtable *rt;
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700825 if (!ip_route_output_key(dev_net(dev), &rt, &fl)) {
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800826 tdev = rt->u.dst.dev;
827 ip_rt_put(rt);
828 }
829 dev->flags |= IFF_POINTOPOINT;
830 }
831
832 if (!tdev && tunnel->parms.link)
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700833 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800834
835 if (tdev) {
836 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
837 dev->mtu = tdev->mtu - sizeof(struct iphdr);
838 if (dev->mtu < IPV6_MIN_MTU)
839 dev->mtu = IPV6_MIN_MTU;
840 }
841 dev->iflink = tunnel->parms.link;
842}
843
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844static int
845ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
846{
847 int err = 0;
848 struct ip_tunnel_parm p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400849 struct ip_tunnel_prl prl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 struct ip_tunnel *t;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700851 struct net *net = dev_net(dev);
852 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
854 switch (cmd) {
855 case SIOCGETTUNNEL:
856 t = NULL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700857 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
859 err = -EFAULT;
860 break;
861 }
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700862 t = ipip6_tunnel_locate(net, &p, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 }
864 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -0800865 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 memcpy(&p, &t->parms, sizeof(p));
867 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
868 err = -EFAULT;
869 break;
870
871 case SIOCADDTUNNEL:
872 case SIOCCHGTUNNEL:
873 err = -EPERM;
874 if (!capable(CAP_NET_ADMIN))
875 goto done;
876
877 err = -EFAULT;
878 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
879 goto done;
880
881 err = -EINVAL;
882 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
883 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
884 goto done;
885 if (p.iph.ttl)
886 p.iph.frag_off |= htons(IP_DF);
887
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700888 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700890 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 if (t != NULL) {
892 if (t->dev != dev) {
893 err = -EEXIST;
894 break;
895 }
896 } else {
897 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
898 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
899 err = -EINVAL;
900 break;
901 }
Patrick McHardy2941a482006-01-08 22:05:26 -0800902 t = netdev_priv(dev);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700903 ipip6_tunnel_unlink(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 t->parms.iph.saddr = p.iph.saddr;
905 t->parms.iph.daddr = p.iph.daddr;
906 memcpy(dev->dev_addr, &p.iph.saddr, 4);
907 memcpy(dev->broadcast, &p.iph.daddr, 4);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700908 ipip6_tunnel_link(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 netdev_state_change(dev);
910 }
911 }
912
913 if (t) {
914 err = 0;
915 if (cmd == SIOCCHGTUNNEL) {
916 t->parms.iph.ttl = p.iph.ttl;
917 t->parms.iph.tos = p.iph.tos;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800918 if (t->parms.link != p.link) {
919 t->parms.link = p.link;
920 ipip6_tunnel_bind_dev(dev);
921 netdev_state_change(dev);
922 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 }
924 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
925 err = -EFAULT;
926 } else
927 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
928 break;
929
930 case SIOCDELTUNNEL:
931 err = -EPERM;
932 if (!capable(CAP_NET_ADMIN))
933 goto done;
934
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700935 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 err = -EFAULT;
937 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
938 goto done;
939 err = -ENOENT;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700940 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 goto done;
942 err = -EPERM;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700943 if (t == netdev_priv(sitn->fb_tunnel_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 goto done;
945 dev = t->dev;
946 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -0800947 unregister_netdevice(dev);
948 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 break;
950
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900951 case SIOCGETPRL:
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700952 err = -EINVAL;
953 if (dev == sitn->fb_tunnel_dev)
954 goto done;
955 err = -ENOENT;
956 if (!(t = netdev_priv(dev)))
957 goto done;
958 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
959 break;
960
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400961 case SIOCADDPRL:
962 case SIOCDELPRL:
963 case SIOCCHGPRL:
964 err = -EPERM;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700965 if (!capable(CAP_NET_ADMIN))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400966 goto done;
967 err = -EINVAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700968 if (dev == sitn->fb_tunnel_dev)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400969 goto done;
970 err = -EFAULT;
971 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
972 goto done;
973 err = -ENOENT;
974 if (!(t = netdev_priv(dev)))
975 goto done;
976
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900977 switch (cmd) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900978 case SIOCDELPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400979 err = ipip6_tunnel_del_prl(t, &prl);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900980 break;
981 case SIOCADDPRL:
982 case SIOCCHGPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400983 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900984 break;
985 }
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700986 netdev_state_change(dev);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400987 break;
988
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 default:
990 err = -EINVAL;
991 }
992
993done:
994 return err;
995}
996
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
998{
999 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1000 return -EINVAL;
1001 dev->mtu = new_mtu;
1002 return 0;
1003}
1004
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001005static const struct net_device_ops ipip6_netdev_ops = {
1006 .ndo_uninit = ipip6_tunnel_uninit,
1007 .ndo_start_xmit = ipip6_tunnel_xmit,
1008 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1009 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1010};
1011
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012static void ipip6_tunnel_setup(struct net_device *dev)
1013{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001014 dev->netdev_ops = &ipip6_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 dev->destructor = free_netdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
1017 dev->type = ARPHRD_SIT;
1018 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
Kris Katterjohn46f25df2006-01-05 16:35:42 -08001019 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 dev->flags = IFF_NOARP;
1021 dev->iflink = 0;
1022 dev->addr_len = 4;
Pavel Emelyanov7a971462008-04-16 01:17:18 -07001023 dev->features |= NETIF_F_NETNS_LOCAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024}
1025
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001026static void ipip6_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001028 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029
1030 tunnel->dev = dev;
1031 strcpy(tunnel->parms.name, dev->name);
1032
1033 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1034 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1035
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001036 ipip6_tunnel_bind_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037}
1038
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001039static void ipip6_fb_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040{
Patrick McHardy2941a482006-01-08 22:05:26 -08001041 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 struct iphdr *iph = &tunnel->parms.iph;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001043 struct net *net = dev_net(dev);
1044 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
1046 tunnel->dev = dev;
1047 strcpy(tunnel->parms.name, dev->name);
1048
1049 iph->version = 4;
1050 iph->protocol = IPPROTO_IPV6;
1051 iph->ihl = 5;
1052 iph->ttl = 64;
1053
1054 dev_hold(dev);
Pavel Emelyanov29182172008-04-16 01:16:38 -07001055 sitn->tunnels_wc[0] = tunnel;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056}
1057
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001058static struct xfrm_tunnel sit_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 .handler = ipip6_rcv,
1060 .err_handler = ipip6_err,
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001061 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062};
1063
Pavel Emelyanov29182172008-04-16 01:16:38 -07001064static void sit_destroy_tunnels(struct sit_net *sitn)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001065{
1066 int prio;
1067
1068 for (prio = 1; prio < 4; prio++) {
1069 int h;
1070 for (h = 0; h < HASH_SIZE; h++) {
1071 struct ip_tunnel *t;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001072 while ((t = sitn->tunnels[prio][h]) != NULL)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001073 unregister_netdevice(t->dev);
1074 }
1075 }
1076}
1077
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001078static int sit_init_net(struct net *net)
1079{
1080 int err;
1081 struct sit_net *sitn;
1082
1083 err = -ENOMEM;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001084 sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001085 if (sitn == NULL)
1086 goto err_alloc;
1087
1088 err = net_assign_generic(net, sit_net_id, sitn);
1089 if (err < 0)
1090 goto err_assign;
1091
Pavel Emelyanov29182172008-04-16 01:16:38 -07001092 sitn->tunnels[0] = sitn->tunnels_wc;
1093 sitn->tunnels[1] = sitn->tunnels_l;
1094 sitn->tunnels[2] = sitn->tunnels_r;
1095 sitn->tunnels[3] = sitn->tunnels_r_l;
1096
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001097 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1098 ipip6_tunnel_setup);
1099 if (!sitn->fb_tunnel_dev) {
1100 err = -ENOMEM;
1101 goto err_alloc_dev;
1102 }
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001103 dev_net_set(sitn->fb_tunnel_dev, net);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001104
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001105 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001106
1107 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1108 goto err_reg_dev;
1109
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001110 return 0;
1111
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001112err_reg_dev:
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001113 dev_put(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001114 free_netdev(sitn->fb_tunnel_dev);
1115err_alloc_dev:
1116 /* nothing */
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001117err_assign:
1118 kfree(sitn);
1119err_alloc:
1120 return err;
1121}
1122
1123static void sit_exit_net(struct net *net)
1124{
1125 struct sit_net *sitn;
1126
1127 sitn = net_generic(net, sit_net_id);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001128 rtnl_lock();
Pavel Emelyanov29182172008-04-16 01:16:38 -07001129 sit_destroy_tunnels(sitn);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001130 unregister_netdevice(sitn->fb_tunnel_dev);
1131 rtnl_unlock();
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001132 kfree(sitn);
1133}
1134
1135static struct pernet_operations sit_net_ops = {
1136 .init = sit_init_net,
1137 .exit = sit_exit_net,
1138};
1139
Adrian Bunk89c89452006-11-20 16:56:48 -08001140static void __exit sit_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141{
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001142 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001143
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001144 unregister_pernet_gen_device(sit_net_id, &sit_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145}
1146
Adrian Bunk89c89452006-11-20 16:56:48 -08001147static int __init sit_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148{
1149 int err;
1150
1151 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1152
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001153 if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 printk(KERN_INFO "sit init: Can't add protocol\n");
1155 return -EAGAIN;
1156 }
1157
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001158 err = register_pernet_gen_device(&sit_net_id, &sit_net_ops);
1159 if (err < 0)
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001160 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001161
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163}
Joerg Roedel989e5b92006-10-10 14:47:44 -07001164
1165module_init(sit_init);
1166module_exit(sit_cleanup);
Jan Dittmer39c85082006-10-13 15:05:53 -07001167MODULE_LICENSE("GPL");
Patrick McHardydaccff02006-11-05 15:47:04 -08001168MODULE_ALIAS("sit0");