blob: 664ab82e03b2ed1a1191a5111fb01e4014410235 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
3 * Linux INET6 implementation
4 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Changes:
15 * Roger Venning <r.venning@telstra.com>: 6to4 support
16 * Nate Thompson <nate@thebog.net>: 6to4 support
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -040017 * Fred Templin <fred.l.templin@boeing.com>: isatap support
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/module.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080021#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/errno.h>
23#include <linux/types.h>
24#include <linux/socket.h>
25#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/net.h>
27#include <linux/in6.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/icmp.h>
31#include <asm/uaccess.h>
32#include <linux/init.h>
33#include <linux/netfilter_ipv4.h>
Kris Katterjohn46f25df2006-01-05 16:35:42 -080034#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <net/sock.h>
37#include <net/snmp.h>
38
39#include <net/ipv6.h>
40#include <net/protocol.h>
41#include <net/transp_v6.h>
42#include <net/ip6_fib.h>
43#include <net/ip6_route.h>
44#include <net/ndisc.h>
45#include <net/addrconf.h>
46#include <net/ip.h>
47#include <net/udp.h>
48#include <net/icmp.h>
49#include <net/ipip.h>
50#include <net/inet_ecn.h>
51#include <net/xfrm.h>
52#include <net/dsfield.h>
Pavel Emelyanov8190d902008-04-16 01:15:17 -070053#include <net/net_namespace.h>
54#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56/*
57 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
58
59 For comments look at net/ipv4/ip_gre.c --ANK
60 */
61
62#define HASH_SIZE 16
Al Viroe69a4adc2006-11-14 20:56:00 -080063#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Stephen Hemminger1326c3d2008-11-20 20:33:56 -080065static void ipip6_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
Linus Torvalds1da177e2005-04-16 15:20:36 -070080static DEFINE_RWLOCK(ipip6_lock);
81
Pavel Emelyanovca8def12008-04-16 01:15:39 -070082static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
83 __be32 remote, __be32 local)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
85 unsigned h0 = HASH(remote);
86 unsigned h1 = HASH(local);
87 struct ip_tunnel *t;
Pavel Emelyanov29182172008-04-16 01:16:38 -070088 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Pavel Emelyanov29182172008-04-16 01:16:38 -070090 for (t = sitn->tunnels_r_l[h0^h1]; t; t = t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 if (local == t->parms.iph.saddr &&
92 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
93 return t;
94 }
Pavel Emelyanov29182172008-04-16 01:16:38 -070095 for (t = sitn->tunnels_r[h0]; t; t = t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
97 return t;
98 }
Pavel Emelyanov29182172008-04-16 01:16:38 -070099 for (t = sitn->tunnels_l[h1]; t; t = t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
101 return t;
102 }
Pavel Emelyanov29182172008-04-16 01:16:38 -0700103 if ((t = sitn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 return t;
105 return NULL;
106}
107
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700108static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn,
109 struct ip_tunnel_parm *parms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900111 __be32 remote = parms->iph.daddr;
112 __be32 local = parms->iph.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 unsigned h = 0;
114 int prio = 0;
115
116 if (remote) {
117 prio |= 2;
118 h ^= HASH(remote);
119 }
120 if (local) {
121 prio |= 1;
122 h ^= HASH(local);
123 }
Pavel Emelyanov29182172008-04-16 01:16:38 -0700124 return &sitn->tunnels[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125}
126
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700127static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn,
128 struct ip_tunnel *t)
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900129{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700130 return __ipip6_bucket(sitn, &t->parms);
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900131}
132
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700133static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
135 struct ip_tunnel **tp;
136
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700137 for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 if (t == *tp) {
139 write_lock_bh(&ipip6_lock);
140 *tp = t->next;
141 write_unlock_bh(&ipip6_lock);
142 break;
143 }
144 }
145}
146
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700147static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700149 struct ip_tunnel **tp = ipip6_bucket(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 t->next = *tp;
152 write_lock_bh(&ipip6_lock);
153 *tp = t;
154 write_unlock_bh(&ipip6_lock);
155}
156
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700157static struct ip_tunnel * ipip6_tunnel_locate(struct net *net,
158 struct ip_tunnel_parm *parms, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
Al Viroe69a4adc2006-11-14 20:56:00 -0800160 __be32 remote = parms->iph.daddr;
161 __be32 local = parms->iph.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 struct ip_tunnel *t, **tp, *nt;
163 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 char name[IFNAMSIZ];
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700165 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700167 for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
169 return t;
170 }
171 if (!create)
172 goto failed;
173
174 if (parms->name[0])
175 strlcpy(name, parms->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800176 else
177 sprintf(name, "sit%%d");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
180 if (dev == NULL)
181 return NULL;
182
Pavel Emelyanov7a971462008-04-16 01:17:18 -0700183 dev_net_set(dev, net);
184
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800185 if (strchr(name, '%')) {
186 if (dev_alloc_name(dev, name) < 0)
187 goto failed_free;
188 }
189
Patrick McHardy2941a482006-01-08 22:05:26 -0800190 nt = netdev_priv(dev);
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 nt->parms = *parms;
Bjørn Mork1b1d8f72009-03-18 18:56:54 -0700193 ipip6_tunnel_init(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100195 if (parms->i_flags & SIT_ISATAP)
196 dev->priv_flags |= IFF_ISATAP;
197
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800198 if (register_netdevice(dev) < 0)
199 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
201 dev_hold(dev);
202
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700203 ipip6_tunnel_link(sitn, nt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 return nt;
205
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800206failed_free:
207 free_netdev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208failed:
209 return NULL;
210}
211
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400212static struct ip_tunnel_prl_entry *
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900213__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400214{
215 struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL;
216
217 for (p = t->prl; p; p = p->next)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900218 if (p->addr == addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400219 break;
220 return p;
221
222}
223
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700224static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
225 struct ip_tunnel_prl __user *a)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900226{
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700227 struct ip_tunnel_prl kprl, *kp;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900228 struct ip_tunnel_prl_entry *prl;
229 unsigned int cmax, c = 0, ca, len;
230 int ret = 0;
231
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700232 if (copy_from_user(&kprl, a, sizeof(kprl)))
233 return -EFAULT;
234 cmax = kprl.datalen / sizeof(kprl);
235 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900236 cmax = 1;
237
238 /* For simple GET or for root users,
239 * we try harder to allocate.
240 */
241 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
242 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
243 NULL;
244
245 read_lock(&ipip6_lock);
246
247 ca = t->prl_count < cmax ? t->prl_count : cmax;
248
249 if (!kp) {
250 /* We don't try hard to allocate much memory for
251 * non-root users.
252 * For root users, retry allocating enough memory for
253 * the answer.
254 */
255 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
256 if (!kp) {
257 ret = -ENOMEM;
258 goto out;
259 }
260 }
261
262 c = 0;
263 for (prl = t->prl; prl; prl = prl->next) {
264 if (c > cmax)
265 break;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700266 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900267 continue;
268 kp[c].addr = prl->addr;
269 kp[c].flags = prl->flags;
270 c++;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700271 if (kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900272 break;
273 }
274out:
275 read_unlock(&ipip6_lock);
276
277 len = sizeof(*kp) * c;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700278 ret = 0;
279 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
280 ret = -EFAULT;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900281
282 kfree(kp);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900283
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700284 return ret;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900285}
286
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400287static int
288ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
289{
290 struct ip_tunnel_prl_entry *p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900291 int err = 0;
292
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900293 if (a->addr == htonl(INADDR_ANY))
294 return -EINVAL;
295
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900296 write_lock(&ipip6_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400297
298 for (p = t->prl; p; p = p->next) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900299 if (p->addr == a->addr) {
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900300 if (chg)
301 goto update;
302 err = -EEXIST;
303 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400304 }
305 }
306
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900307 if (chg) {
308 err = -ENXIO;
309 goto out;
310 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400311
312 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900313 if (!p) {
314 err = -ENOBUFS;
315 goto out;
316 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400317
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400318 p->next = t->prl;
319 t->prl = p;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900320 t->prl_count++;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900321update:
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900322 p->addr = a->addr;
323 p->flags = a->flags;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900324out:
325 write_unlock(&ipip6_lock);
326 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400327}
328
329static int
330ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
331{
332 struct ip_tunnel_prl_entry *x, **p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900333 int err = 0;
334
335 write_lock(&ipip6_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400336
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900337 if (a && a->addr != htonl(INADDR_ANY)) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400338 for (p = &t->prl; *p; p = &(*p)->next) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900339 if ((*p)->addr == a->addr) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400340 x = *p;
341 *p = x->next;
342 kfree(x);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900343 t->prl_count--;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900344 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400345 }
346 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900347 err = -ENXIO;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400348 } else {
349 while (t->prl) {
350 x = t->prl;
351 t->prl = t->prl->next;
352 kfree(x);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900353 t->prl_count--;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400354 }
355 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900356out:
357 write_unlock(&ipip6_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400358 return 0;
359}
360
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400361static int
362isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
363{
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900364 struct ip_tunnel_prl_entry *p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400365 int ok = 1;
366
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900367 read_lock(&ipip6_lock);
368 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400369 if (p) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900370 if (p->flags & PRL_DEFAULT)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400371 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
372 else
373 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
374 } else {
375 struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
376 if (ipv6_addr_is_isatap(addr6) &&
377 (addr6->s6_addr32[3] == iph->saddr) &&
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400378 ipv6_chk_prefix(addr6, t->dev))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400379 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
380 else
381 ok = 0;
382 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900383 read_unlock(&ipip6_lock);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400384 return ok;
385}
386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387static void ipip6_tunnel_uninit(struct net_device *dev)
388{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700389 struct net *net = dev_net(dev);
390 struct sit_net *sitn = net_generic(net, sit_net_id);
391
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700392 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 write_lock_bh(&ipip6_lock);
Pavel Emelyanov29182172008-04-16 01:16:38 -0700394 sitn->tunnels_wc[0] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 write_unlock_bh(&ipip6_lock);
396 dev_put(dev);
397 } else {
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700398 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
YOSHIFUJI Hideaki02e10b92008-04-10 15:41:27 +0900399 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 dev_put(dev);
401 }
402}
403
404
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800405static int ipip6_err(struct sk_buff *skb, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Rami Rosen071f92d2008-05-21 17:47:54 -0700408/* All the routers (except for Linux) return only
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 8 bytes of packet payload. It means, that precise relaying of
410 ICMP in the real Internet is absolutely infeasible.
411 */
412 struct iphdr *iph = (struct iphdr*)skb->data;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300413 const int type = icmp_hdr(skb)->type;
414 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 struct ip_tunnel *t;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800416 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 switch (type) {
419 default:
420 case ICMP_PARAMETERPROB:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800421 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423 case ICMP_DEST_UNREACH:
424 switch (code) {
425 case ICMP_SR_FAILED:
426 case ICMP_PORT_UNREACH:
427 /* Impossible event. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800428 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 case ICMP_FRAG_NEEDED:
430 /* Soft state for pmtu is maintained by IP core. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800431 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 default:
433 /* All others are translated to HOST_UNREACH.
434 rfc2003 contains "deep thoughts" about NET_UNREACH,
435 I believe they are just ether pollution. --ANK
436 */
437 break;
438 }
439 break;
440 case ICMP_TIME_EXCEEDED:
441 if (code != ICMP_EXC_TTL)
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800442 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 break;
444 }
445
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800446 err = -ENOENT;
447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 read_lock(&ipip6_lock);
Pavel Emelyanovfcee5ec2008-04-16 01:15:59 -0700449 t = ipip6_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 if (t == NULL || t->parms.iph.daddr == 0)
451 goto out;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800452
453 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
455 goto out;
456
Wei Yongjunbb800872009-02-24 23:37:19 -0800457 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 t->err_count++;
459 else
460 t->err_count = 1;
461 t->err_time = jiffies;
462out:
463 read_unlock(&ipip6_lock);
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800464 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465}
466
467static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
468{
469 if (INET_ECN_is_ce(iph->tos))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700470 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
473static int ipip6_rcv(struct sk_buff *skb)
474{
475 struct iphdr *iph;
476 struct ip_tunnel *tunnel;
477
478 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
479 goto out;
480
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700481 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 read_lock(&ipip6_lock);
Pavel Emelyanovfcee5ec2008-04-16 01:15:59 -0700484 if ((tunnel = ipip6_tunnel_lookup(dev_net(skb->dev),
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700485 iph->saddr, iph->daddr)) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700487 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700488 skb_reset_network_header(skb);
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800489 IPCB(skb)->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 skb->protocol = htons(ETH_P_IPV6);
491 skb->pkt_type = PACKET_HOST;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100492
493 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400494 !isatap_chksrc(skb, iph, tunnel)) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700495 tunnel->dev->stats.rx_errors++;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100496 read_unlock(&ipip6_lock);
497 kfree_skb(skb);
498 return 0;
499 }
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700500 tunnel->dev->stats.rx_packets++;
501 tunnel->dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 skb->dev = tunnel->dev;
503 dst_release(skb->dst);
504 skb->dst = NULL;
505 nf_reset(skb);
506 ipip6_ecn_decapsulate(iph, skb);
507 netif_rx(skb);
508 read_unlock(&ipip6_lock);
509 return 0;
510 }
511
Herbert Xu45af08b2006-04-05 22:31:19 -0700512 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 read_unlock(&ipip6_lock);
514out:
David S. Miller36ca34c2008-05-08 23:40:26 -0700515 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 return 0;
517}
518
519/* Returns the embedded IPv4 address if the IPv6 address
520 comes from 6to4 (RFC 3056) addr space */
521
Al Viroe69a4adc2006-11-14 20:56:00 -0800522static inline __be32 try_6to4(struct in6_addr *v6dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523{
Al Viroe69a4adc2006-11-14 20:56:00 -0800524 __be32 dst = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 if (v6dst->s6_addr16[0] == htons(0x2002)) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900527 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 memcpy(&dst, &v6dst->s6_addr16[1], 4);
529 }
530 return dst;
531}
532
533/*
534 * This function assumes it is being called from dev_queue_xmit()
535 * and that skb is filled properly by that function.
536 */
537
538static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
539{
Patrick McHardy2941a482006-01-08 22:05:26 -0800540 struct ip_tunnel *tunnel = netdev_priv(dev);
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700541 struct net_device_stats *stats = &tunnel->dev->stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 struct iphdr *tiph = &tunnel->parms.iph;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700543 struct ipv6hdr *iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 u8 tos = tunnel->parms.iph.tos;
545 struct rtable *rt; /* Route to the other host */
546 struct net_device *tdev; /* Device to other host */
547 struct iphdr *iph; /* Our new IP header */
Chuck Leverc2636b42007-10-23 21:07:32 -0700548 unsigned int max_headroom; /* The extra header space needed */
Al Viroe69a4adc2006-11-14 20:56:00 -0800549 __be32 dst = tiph->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 int mtu;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900551 struct in6_addr *addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 int addr_type;
553
554 if (tunnel->recursion++) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700555 stats->collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 goto tx_error;
557 }
558
559 if (skb->protocol != htons(ETH_P_IPV6))
560 goto tx_error;
561
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100562 /* ISATAP (RFC4214) - must come before 6to4 */
563 if (dev->priv_flags & IFF_ISATAP) {
564 struct neighbour *neigh = NULL;
565
566 if (skb->dst)
567 neigh = skb->dst->neighbour;
568
569 if (neigh == NULL) {
570 if (net_ratelimit())
571 printk(KERN_DEBUG "sit: nexthop == NULL\n");
572 goto tx_error;
573 }
574
575 addr6 = (struct in6_addr*)&neigh->primary_key;
576 addr_type = ipv6_addr_type(addr6);
577
578 if ((addr_type & IPV6_ADDR_UNICAST) &&
579 ipv6_addr_is_isatap(addr6))
580 dst = addr6->s6_addr32[3];
581 else
582 goto tx_error;
583 }
584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 if (!dst)
586 dst = try_6to4(&iph6->daddr);
587
588 if (!dst) {
589 struct neighbour *neigh = NULL;
590
591 if (skb->dst)
592 neigh = skb->dst->neighbour;
593
594 if (neigh == NULL) {
595 if (net_ratelimit())
596 printk(KERN_DEBUG "sit: nexthop == NULL\n");
597 goto tx_error;
598 }
599
600 addr6 = (struct in6_addr*)&neigh->primary_key;
601 addr_type = ipv6_addr_type(addr6);
602
603 if (addr_type == IPV6_ADDR_ANY) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700604 addr6 = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 addr_type = ipv6_addr_type(addr6);
606 }
607
608 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
609 goto tx_error_icmp;
610
611 dst = addr6->s6_addr32[3];
612 }
613
614 {
615 struct flowi fl = { .nl_u = { .ip4_u =
616 { .daddr = dst,
617 .saddr = tiph->saddr,
618 .tos = RT_TOS(tos) } },
619 .oif = tunnel->parms.link,
620 .proto = IPPROTO_IPV6 };
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700621 if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700622 stats->tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 goto tx_error_icmp;
624 }
625 }
626 if (rt->rt_type != RTN_UNICAST) {
627 ip_rt_put(rt);
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700628 stats->tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 goto tx_error_icmp;
630 }
631 tdev = rt->u.dst.dev;
632
633 if (tdev == dev) {
634 ip_rt_put(rt);
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700635 stats->collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 goto tx_error;
637 }
638
639 if (tiph->frag_off)
640 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
641 else
642 mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu;
643
644 if (mtu < 68) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700645 stats->collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 ip_rt_put(rt);
647 goto tx_error;
648 }
649 if (mtu < IPV6_MIN_MTU)
650 mtu = IPV6_MIN_MTU;
651 if (tunnel->parms.iph.daddr && skb->dst)
652 skb->dst->ops->update_pmtu(skb->dst, mtu);
653
654 if (skb->len > mtu) {
655 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
656 ip_rt_put(rt);
657 goto tx_error;
658 }
659
660 if (tunnel->err_count > 0) {
Wei Yongjunbb800872009-02-24 23:37:19 -0800661 if (time_before(jiffies,
662 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 tunnel->err_count--;
664 dst_link_failure(skb);
665 } else
666 tunnel->err_count = 0;
667 }
668
669 /*
670 * Okay, now see if we can stuff it in the buffer as-is.
671 */
672 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
673
Patrick McHardycfbba492007-07-09 15:33:40 -0700674 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
675 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
677 if (!new_skb) {
678 ip_rt_put(rt);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900679 stats->tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 dev_kfree_skb(skb);
681 tunnel->recursion--;
682 return 0;
683 }
684 if (skb->sk)
685 skb_set_owner_w(new_skb, skb->sk);
686 dev_kfree_skb(skb);
687 skb = new_skb;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700688 iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 }
690
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700691 skb->transport_header = skb->network_header;
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700692 skb_push(skb, sizeof(struct iphdr));
693 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800695 IPCB(skb)->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 dst_release(skb->dst);
697 skb->dst = &rt->u.dst;
698
699 /*
700 * Push down and install the IPIP header.
701 */
702
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700703 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 iph->version = 4;
705 iph->ihl = sizeof(struct iphdr)>>2;
706 if (mtu > IPV6_MIN_MTU)
707 iph->frag_off = htons(IP_DF);
708 else
709 iph->frag_off = 0;
710
711 iph->protocol = IPPROTO_IPV6;
712 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
713 iph->daddr = rt->rt_dst;
714 iph->saddr = rt->rt_src;
715
716 if ((iph->ttl = tiph->ttl) == 0)
717 iph->ttl = iph6->hop_limit;
718
719 nf_reset(skb);
720
721 IPTUNNEL_XMIT();
722 tunnel->recursion--;
723 return 0;
724
725tx_error_icmp:
726 dst_link_failure(skb);
727tx_error:
728 stats->tx_errors++;
729 dev_kfree_skb(skb);
730 tunnel->recursion--;
731 return 0;
732}
733
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800734static void ipip6_tunnel_bind_dev(struct net_device *dev)
735{
736 struct net_device *tdev = NULL;
737 struct ip_tunnel *tunnel;
738 struct iphdr *iph;
739
740 tunnel = netdev_priv(dev);
741 iph = &tunnel->parms.iph;
742
743 if (iph->daddr) {
744 struct flowi fl = { .nl_u = { .ip4_u =
745 { .daddr = iph->daddr,
746 .saddr = iph->saddr,
747 .tos = RT_TOS(iph->tos) } },
748 .oif = tunnel->parms.link,
749 .proto = IPPROTO_IPV6 };
750 struct rtable *rt;
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700751 if (!ip_route_output_key(dev_net(dev), &rt, &fl)) {
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800752 tdev = rt->u.dst.dev;
753 ip_rt_put(rt);
754 }
755 dev->flags |= IFF_POINTOPOINT;
756 }
757
758 if (!tdev && tunnel->parms.link)
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700759 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800760
761 if (tdev) {
762 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
763 dev->mtu = tdev->mtu - sizeof(struct iphdr);
764 if (dev->mtu < IPV6_MIN_MTU)
765 dev->mtu = IPV6_MIN_MTU;
766 }
767 dev->iflink = tunnel->parms.link;
768}
769
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770static int
771ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
772{
773 int err = 0;
774 struct ip_tunnel_parm p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400775 struct ip_tunnel_prl prl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 struct ip_tunnel *t;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700777 struct net *net = dev_net(dev);
778 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
780 switch (cmd) {
781 case SIOCGETTUNNEL:
782 t = NULL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700783 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
785 err = -EFAULT;
786 break;
787 }
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700788 t = ipip6_tunnel_locate(net, &p, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 }
790 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -0800791 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 memcpy(&p, &t->parms, sizeof(p));
793 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
794 err = -EFAULT;
795 break;
796
797 case SIOCADDTUNNEL:
798 case SIOCCHGTUNNEL:
799 err = -EPERM;
800 if (!capable(CAP_NET_ADMIN))
801 goto done;
802
803 err = -EFAULT;
804 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
805 goto done;
806
807 err = -EINVAL;
808 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
809 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
810 goto done;
811 if (p.iph.ttl)
812 p.iph.frag_off |= htons(IP_DF);
813
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700814 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700816 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 if (t != NULL) {
818 if (t->dev != dev) {
819 err = -EEXIST;
820 break;
821 }
822 } else {
823 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
824 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
825 err = -EINVAL;
826 break;
827 }
Patrick McHardy2941a482006-01-08 22:05:26 -0800828 t = netdev_priv(dev);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700829 ipip6_tunnel_unlink(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 t->parms.iph.saddr = p.iph.saddr;
831 t->parms.iph.daddr = p.iph.daddr;
832 memcpy(dev->dev_addr, &p.iph.saddr, 4);
833 memcpy(dev->broadcast, &p.iph.daddr, 4);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700834 ipip6_tunnel_link(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 netdev_state_change(dev);
836 }
837 }
838
839 if (t) {
840 err = 0;
841 if (cmd == SIOCCHGTUNNEL) {
842 t->parms.iph.ttl = p.iph.ttl;
843 t->parms.iph.tos = p.iph.tos;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800844 if (t->parms.link != p.link) {
845 t->parms.link = p.link;
846 ipip6_tunnel_bind_dev(dev);
847 netdev_state_change(dev);
848 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 }
850 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
851 err = -EFAULT;
852 } else
853 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
854 break;
855
856 case SIOCDELTUNNEL:
857 err = -EPERM;
858 if (!capable(CAP_NET_ADMIN))
859 goto done;
860
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700861 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 err = -EFAULT;
863 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
864 goto done;
865 err = -ENOENT;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700866 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 goto done;
868 err = -EPERM;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700869 if (t == netdev_priv(sitn->fb_tunnel_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 goto done;
871 dev = t->dev;
872 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -0800873 unregister_netdevice(dev);
874 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 break;
876
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900877 case SIOCGETPRL:
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700878 err = -EINVAL;
879 if (dev == sitn->fb_tunnel_dev)
880 goto done;
881 err = -ENOENT;
882 if (!(t = netdev_priv(dev)))
883 goto done;
884 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
885 break;
886
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400887 case SIOCADDPRL:
888 case SIOCDELPRL:
889 case SIOCCHGPRL:
890 err = -EPERM;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700891 if (!capable(CAP_NET_ADMIN))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400892 goto done;
893 err = -EINVAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700894 if (dev == sitn->fb_tunnel_dev)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400895 goto done;
896 err = -EFAULT;
897 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
898 goto done;
899 err = -ENOENT;
900 if (!(t = netdev_priv(dev)))
901 goto done;
902
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900903 switch (cmd) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900904 case SIOCDELPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400905 err = ipip6_tunnel_del_prl(t, &prl);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900906 break;
907 case SIOCADDPRL:
908 case SIOCCHGPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400909 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900910 break;
911 }
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700912 netdev_state_change(dev);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400913 break;
914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 default:
916 err = -EINVAL;
917 }
918
919done:
920 return err;
921}
922
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
924{
925 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
926 return -EINVAL;
927 dev->mtu = new_mtu;
928 return 0;
929}
930
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800931static const struct net_device_ops ipip6_netdev_ops = {
932 .ndo_uninit = ipip6_tunnel_uninit,
933 .ndo_start_xmit = ipip6_tunnel_xmit,
934 .ndo_do_ioctl = ipip6_tunnel_ioctl,
935 .ndo_change_mtu = ipip6_tunnel_change_mtu,
936};
937
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938static void ipip6_tunnel_setup(struct net_device *dev)
939{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800940 dev->netdev_ops = &ipip6_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 dev->destructor = free_netdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
943 dev->type = ARPHRD_SIT;
944 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800945 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 dev->flags = IFF_NOARP;
947 dev->iflink = 0;
948 dev->addr_len = 4;
Pavel Emelyanov7a971462008-04-16 01:17:18 -0700949 dev->features |= NETIF_F_NETNS_LOCAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950}
951
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800952static void ipip6_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800954 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
956 tunnel->dev = dev;
957 strcpy(tunnel->parms.name, dev->name);
958
959 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
960 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
961
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800962 ipip6_tunnel_bind_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963}
964
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800965static void ipip6_fb_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966{
Patrick McHardy2941a482006-01-08 22:05:26 -0800967 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 struct iphdr *iph = &tunnel->parms.iph;
Pavel Emelyanov29182172008-04-16 01:16:38 -0700969 struct net *net = dev_net(dev);
970 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
972 tunnel->dev = dev;
973 strcpy(tunnel->parms.name, dev->name);
974
975 iph->version = 4;
976 iph->protocol = IPPROTO_IPV6;
977 iph->ihl = 5;
978 iph->ttl = 64;
979
980 dev_hold(dev);
Pavel Emelyanov29182172008-04-16 01:16:38 -0700981 sitn->tunnels_wc[0] = tunnel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982}
983
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800984static struct xfrm_tunnel sit_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 .handler = ipip6_rcv,
986 .err_handler = ipip6_err,
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800987 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988};
989
Pavel Emelyanov29182172008-04-16 01:16:38 -0700990static void sit_destroy_tunnels(struct sit_net *sitn)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -0700991{
992 int prio;
993
994 for (prio = 1; prio < 4; prio++) {
995 int h;
996 for (h = 0; h < HASH_SIZE; h++) {
997 struct ip_tunnel *t;
Pavel Emelyanov29182172008-04-16 01:16:38 -0700998 while ((t = sitn->tunnels[prio][h]) != NULL)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -0700999 unregister_netdevice(t->dev);
1000 }
1001 }
1002}
1003
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001004static int sit_init_net(struct net *net)
1005{
1006 int err;
1007 struct sit_net *sitn;
1008
1009 err = -ENOMEM;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001010 sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001011 if (sitn == NULL)
1012 goto err_alloc;
1013
1014 err = net_assign_generic(net, sit_net_id, sitn);
1015 if (err < 0)
1016 goto err_assign;
1017
Pavel Emelyanov29182172008-04-16 01:16:38 -07001018 sitn->tunnels[0] = sitn->tunnels_wc;
1019 sitn->tunnels[1] = sitn->tunnels_l;
1020 sitn->tunnels[2] = sitn->tunnels_r;
1021 sitn->tunnels[3] = sitn->tunnels_r_l;
1022
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001023 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1024 ipip6_tunnel_setup);
1025 if (!sitn->fb_tunnel_dev) {
1026 err = -ENOMEM;
1027 goto err_alloc_dev;
1028 }
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001029 dev_net_set(sitn->fb_tunnel_dev, net);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001030
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001031 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001032
1033 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1034 goto err_reg_dev;
1035
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001036 return 0;
1037
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001038err_reg_dev:
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001039 dev_put(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001040 free_netdev(sitn->fb_tunnel_dev);
1041err_alloc_dev:
1042 /* nothing */
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001043err_assign:
1044 kfree(sitn);
1045err_alloc:
1046 return err;
1047}
1048
1049static void sit_exit_net(struct net *net)
1050{
1051 struct sit_net *sitn;
1052
1053 sitn = net_generic(net, sit_net_id);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001054 rtnl_lock();
Pavel Emelyanov29182172008-04-16 01:16:38 -07001055 sit_destroy_tunnels(sitn);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001056 unregister_netdevice(sitn->fb_tunnel_dev);
1057 rtnl_unlock();
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001058 kfree(sitn);
1059}
1060
1061static struct pernet_operations sit_net_ops = {
1062 .init = sit_init_net,
1063 .exit = sit_exit_net,
1064};
1065
Adrian Bunk89c89452006-11-20 16:56:48 -08001066static void __exit sit_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067{
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001068 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001069
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001070 unregister_pernet_gen_device(sit_net_id, &sit_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071}
1072
Adrian Bunk89c89452006-11-20 16:56:48 -08001073static int __init sit_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074{
1075 int err;
1076
1077 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1078
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001079 if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 printk(KERN_INFO "sit init: Can't add protocol\n");
1081 return -EAGAIN;
1082 }
1083
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001084 err = register_pernet_gen_device(&sit_net_id, &sit_net_ops);
1085 if (err < 0)
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001086 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001087
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089}
Joerg Roedel989e5b92006-10-10 14:47:44 -07001090
1091module_init(sit_init);
1092module_exit(sit_cleanup);
Jan Dittmer39c85082006-10-13 15:05:53 -07001093MODULE_LICENSE("GPL");
Patrick McHardydaccff02006-11-05 15:47:04 -08001094MODULE_ALIAS("sit0");