blob: 1b4a4a95367552c8cc22d19850b0779eee87cdc6 [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
Joe Perchesf3213832012-05-15 14:11:53 +000020#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/module.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080023#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/net.h>
29#include <linux/in6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/icmp.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/uaccess.h>
35#include <linux/init.h>
36#include <linux/netfilter_ipv4.h>
Kris Katterjohn46f25df2006-01-05 16:35:42 -080037#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <net/sock.h>
40#include <net/snmp.h>
41
42#include <net/ipv6.h>
43#include <net/protocol.h>
44#include <net/transp_v6.h>
45#include <net/ip6_fib.h>
46#include <net/ip6_route.h>
47#include <net/ndisc.h>
48#include <net/addrconf.h>
49#include <net/ip.h>
50#include <net/udp.h>
51#include <net/icmp.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000052#include <net/ip_tunnels.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <net/inet_ecn.h>
54#include <net/xfrm.h>
55#include <net/dsfield.h>
Pavel Emelyanov8190d902008-04-16 01:15:17 -070056#include <net/net_namespace.h>
57#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59/*
60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
61
62 For comments look at net/ipv4/ip_gre.c --ANK
63 */
64
65#define HASH_SIZE 16
Al Viroe69a4adc2006-11-14 20:56:00 -080066#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +000068static bool log_ecn_error = true;
69module_param(log_ecn_error, bool, 0644);
70MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
71
Eric Dumazet15fc1f72010-09-27 00:38:18 +000072static int ipip6_tunnel_init(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073static void ipip6_tunnel_setup(struct net_device *dev);
Eric Dumazet15fc1f72010-09-27 00:38:18 +000074static void ipip6_dev_free(struct net_device *dev);
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +000075static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
76 __be32 *v4dst);
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +000077static struct rtnl_link_ops sit_link_ops __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Eric Dumazetf99189b2009-11-17 10:42:49 +000079static int sit_net_id __read_mostly;
Pavel Emelyanov8190d902008-04-16 01:15:17 -070080struct sit_net {
Eric Dumazet3a43be32010-09-15 11:35:10 +000081 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
82 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
83 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
84 struct ip_tunnel __rcu *tunnels_wc[1];
85 struct ip_tunnel __rcu **tunnels[4];
Pavel Emelyanov29182172008-04-16 01:16:38 -070086
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -070087 struct net_device *fb_tunnel_dev;
Pavel Emelyanov8190d902008-04-16 01:15:17 -070088};
89
Eric Dumazet4543c102009-10-23 17:52:14 +000090/*
91 * Must be invoked with rcu_read_lock
92 */
Eldad Zack3e866702012-04-01 07:49:01 +000093static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +000094 struct net_device *dev, __be32 remote, __be32 local)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
Eric Dumazet3a43be32010-09-15 11:35:10 +000096 unsigned int h0 = HASH(remote);
97 unsigned int h1 = HASH(local);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 struct ip_tunnel *t;
Pavel Emelyanov29182172008-04-16 01:16:38 -070099 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Amerigo Wange086cad2012-11-11 21:52:34 +0000101 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000103 remote == t->parms.iph.daddr &&
104 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
105 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 return t;
107 }
Amerigo Wange086cad2012-11-11 21:52:34 +0000108 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000109 if (remote == t->parms.iph.daddr &&
110 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
111 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return t;
113 }
Amerigo Wange086cad2012-11-11 21:52:34 +0000114 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000115 if (local == t->parms.iph.saddr &&
116 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
117 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 return t;
119 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000120 t = rcu_dereference(sitn->tunnels_wc[0]);
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000121 if ((t != NULL) && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 return t;
123 return NULL;
124}
125
Eric Dumazet3a43be32010-09-15 11:35:10 +0000126static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700127 struct ip_tunnel_parm *parms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900129 __be32 remote = parms->iph.daddr;
130 __be32 local = parms->iph.saddr;
Eric Dumazet3a43be32010-09-15 11:35:10 +0000131 unsigned int h = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 int prio = 0;
133
134 if (remote) {
135 prio |= 2;
136 h ^= HASH(remote);
137 }
138 if (local) {
139 prio |= 1;
140 h ^= HASH(local);
141 }
Pavel Emelyanov29182172008-04-16 01:16:38 -0700142 return &sitn->tunnels[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143}
144
Eric Dumazet3a43be32010-09-15 11:35:10 +0000145static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700146 struct ip_tunnel *t)
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900147{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700148 return __ipip6_bucket(sitn, &t->parms);
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900149}
150
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700151static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
Eric Dumazet3a43be32010-09-15 11:35:10 +0000153 struct ip_tunnel __rcu **tp;
154 struct ip_tunnel *iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Eric Dumazet3a43be32010-09-15 11:35:10 +0000156 for (tp = ipip6_bucket(sitn, t);
157 (iter = rtnl_dereference(*tp)) != NULL;
158 tp = &iter->next) {
159 if (t == iter) {
Eric Dumazetcf778b02012-01-12 04:41:32 +0000160 rcu_assign_pointer(*tp, t->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 break;
162 }
163 }
164}
165
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700166static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167{
Eric Dumazet3a43be32010-09-15 11:35:10 +0000168 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Eric Dumazetcf778b02012-01-12 04:41:32 +0000170 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
171 rcu_assign_pointer(*tp, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000174static 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 +0000175{
176#ifdef CONFIG_IPV6_SIT_6RD
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000177 struct ip_tunnel *t = netdev_priv(dev);
178
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000179 if (t->dev == sitn->fb_tunnel_dev) {
180 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
181 t->ip6rd.relay_prefix = 0;
182 t->ip6rd.prefixlen = 16;
183 t->ip6rd.relay_prefixlen = 0;
184 } else {
185 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
186 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
187 }
188#endif
189}
190
Nicolas Dichtelf3723412012-11-14 05:14:07 +0000191static int ipip6_tunnel_create(struct net_device *dev)
192{
193 struct ip_tunnel *t = netdev_priv(dev);
194 struct net *net = dev_net(dev);
195 struct sit_net *sitn = net_generic(net, sit_net_id);
196 int err;
197
198 err = ipip6_tunnel_init(dev);
199 if (err < 0)
200 goto out;
201 ipip6_tunnel_clone_6rd(dev, sitn);
202
Nicolas Dichteld440b722012-11-15 04:06:41 +0000203 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
Nicolas Dichtelf3723412012-11-14 05:14:07 +0000204 dev->priv_flags |= IFF_ISATAP;
205
206 err = register_netdevice(dev);
207 if (err < 0)
208 goto out;
209
210 strcpy(t->parms.name, dev->name);
211 dev->rtnl_link_ops = &sit_link_ops;
212
213 dev_hold(dev);
214
215 ipip6_tunnel_link(sitn, t);
216 return 0;
217
218out:
219 return err;
220}
221
Eric Dumazet3a43be32010-09-15 11:35:10 +0000222static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700223 struct ip_tunnel_parm *parms, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
Al Viroe69a4adc2006-11-14 20:56:00 -0800225 __be32 remote = parms->iph.daddr;
226 __be32 local = parms->iph.saddr;
Eric Dumazet3a43be32010-09-15 11:35:10 +0000227 struct ip_tunnel *t, *nt;
228 struct ip_tunnel __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 char name[IFNAMSIZ];
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700231 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Eric Dumazet3a43be32010-09-15 11:35:10 +0000233 for (tp = __ipip6_bucket(sitn, parms);
234 (t = rtnl_dereference(*tp)) != NULL;
235 tp = &t->next) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000236 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000237 remote == t->parms.iph.daddr &&
238 parms->link == t->parms.link) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000239 if (create)
240 return NULL;
241 else
242 return t;
243 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 }
245 if (!create)
246 goto failed;
247
248 if (parms->name[0])
249 strlcpy(name, parms->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800250 else
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000251 strcpy(name, "sit%d");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
253 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
254 if (dev == NULL)
255 return NULL;
256
Pavel Emelyanov7a971462008-04-16 01:17:18 -0700257 dev_net_set(dev, net);
258
Patrick McHardy2941a482006-01-08 22:05:26 -0800259 nt = netdev_priv(dev);
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 nt->parms = *parms;
Nicolas Dichtelf3723412012-11-14 05:14:07 +0000262 if (ipip6_tunnel_create(dev) < 0)
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800263 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 return nt;
266
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800267failed_free:
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000268 ipip6_dev_free(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269failed:
270 return NULL;
271}
272
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000273#define for_each_prl_rcu(start) \
274 for (prl = rcu_dereference(start); \
275 prl; \
276 prl = rcu_dereference(prl->next))
277
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400278static struct ip_tunnel_prl_entry *
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900279__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400280{
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000281 struct ip_tunnel_prl_entry *prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400282
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000283 for_each_prl_rcu(t->prl)
284 if (prl->addr == addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400285 break;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000286 return prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400287
288}
289
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700290static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
291 struct ip_tunnel_prl __user *a)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900292{
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700293 struct ip_tunnel_prl kprl, *kp;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900294 struct ip_tunnel_prl_entry *prl;
295 unsigned int cmax, c = 0, ca, len;
296 int ret = 0;
297
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700298 if (copy_from_user(&kprl, a, sizeof(kprl)))
299 return -EFAULT;
300 cmax = kprl.datalen / sizeof(kprl);
301 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900302 cmax = 1;
303
304 /* For simple GET or for root users,
305 * we try harder to allocate.
306 */
307 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
308 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
309 NULL;
310
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000311 rcu_read_lock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900312
313 ca = t->prl_count < cmax ? t->prl_count : cmax;
314
315 if (!kp) {
316 /* We don't try hard to allocate much memory for
317 * non-root users.
318 * For root users, retry allocating enough memory for
319 * the answer.
320 */
321 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
322 if (!kp) {
323 ret = -ENOMEM;
324 goto out;
325 }
326 }
327
328 c = 0;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000329 for_each_prl_rcu(t->prl) {
Sascha Hlusiak298bf122009-09-29 11:27:05 +0000330 if (c >= cmax)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900331 break;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700332 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900333 continue;
334 kp[c].addr = prl->addr;
335 kp[c].flags = prl->flags;
336 c++;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700337 if (kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900338 break;
339 }
340out:
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000341 rcu_read_unlock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900342
343 len = sizeof(*kp) * c;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700344 ret = 0;
345 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
346 ret = -EFAULT;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900347
348 kfree(kp);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900349
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700350 return ret;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900351}
352
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400353static int
354ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
355{
356 struct ip_tunnel_prl_entry *p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900357 int err = 0;
358
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900359 if (a->addr == htonl(INADDR_ANY))
360 return -EINVAL;
361
Eric Dumazetaac4ddd2010-06-01 00:26:58 -0700362 ASSERT_RTNL();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400363
Eric Dumazet3a43be32010-09-15 11:35:10 +0000364 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900365 if (p->addr == a->addr) {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000366 if (chg) {
367 p->flags = a->flags;
368 goto out;
369 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900370 err = -EEXIST;
371 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400372 }
373 }
374
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900375 if (chg) {
376 err = -ENXIO;
377 goto out;
378 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400379
380 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900381 if (!p) {
382 err = -ENOBUFS;
383 goto out;
384 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400385
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400386 p->next = t->prl;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900387 p->addr = a->addr;
388 p->flags = a->flags;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000389 t->prl_count++;
Eric Dumazetcf778b02012-01-12 04:41:32 +0000390 rcu_assign_pointer(t->prl, p);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900391out:
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900392 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400393}
394
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000395static void prl_list_destroy_rcu(struct rcu_head *head)
396{
397 struct ip_tunnel_prl_entry *p, *n;
398
399 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
400 do {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000401 n = rcu_dereference_protected(p->next, 1);
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000402 kfree(p);
403 p = n;
404 } while (p);
405}
406
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400407static int
408ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
409{
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000410 struct ip_tunnel_prl_entry *x;
411 struct ip_tunnel_prl_entry __rcu **p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900412 int err = 0;
413
Eric Dumazetaac4ddd2010-06-01 00:26:58 -0700414 ASSERT_RTNL();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400415
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900416 if (a && a->addr != htonl(INADDR_ANY)) {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000417 for (p = &t->prl;
418 (x = rtnl_dereference(*p)) != NULL;
419 p = &x->next) {
420 if (x->addr == a->addr) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400421 *p = x->next;
Paul E. McKenney11c476f2011-05-02 00:56:57 -0700422 kfree_rcu(x, rcu_head);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900423 t->prl_count--;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900424 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400425 }
426 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900427 err = -ENXIO;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400428 } else {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000429 x = rtnl_dereference(t->prl);
430 if (x) {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000431 t->prl_count = 0;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000432 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
433 t->prl = NULL;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400434 }
435 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900436out:
Sascha Hlusiak4b27960172009-05-19 12:56:50 +0000437 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400438}
439
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400440static int
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000441isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400442{
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900443 struct ip_tunnel_prl_entry *p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400444 int ok = 1;
445
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000446 rcu_read_lock();
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900447 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400448 if (p) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900449 if (p->flags & PRL_DEFAULT)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400450 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
451 else
452 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
453 } else {
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000454 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
455
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400456 if (ipv6_addr_is_isatap(addr6) &&
457 (addr6->s6_addr32[3] == iph->saddr) &&
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400458 ipv6_chk_prefix(addr6, t->dev))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400459 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
460 else
461 ok = 0;
462 }
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000463 rcu_read_unlock();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400464 return ok;
465}
466
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467static void ipip6_tunnel_uninit(struct net_device *dev)
468{
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +0200469 struct ip_tunnel *tunnel = netdev_priv(dev);
470 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700471
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700472 if (dev == sitn->fb_tunnel_dev) {
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000473 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 } else {
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +0200475 ipip6_tunnel_unlink(sitn, tunnel);
476 ipip6_tunnel_del_prl(tunnel, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 }
Eric Dumazet3a43be32010-09-15 11:35:10 +0000478 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479}
480
481
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800482static int ipip6_err(struct sk_buff *skb, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Rami Rosen071f92d2008-05-21 17:47:54 -0700485/* All the routers (except for Linux) return only
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 8 bytes of packet payload. It means, that precise relaying of
487 ICMP in the real Internet is absolutely infeasible.
488 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000489 const struct iphdr *iph = (const struct iphdr *)skb->data;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300490 const int type = icmp_hdr(skb)->type;
491 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 struct ip_tunnel *t;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800493 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495 switch (type) {
496 default:
497 case ICMP_PARAMETERPROB:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800498 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 case ICMP_DEST_UNREACH:
501 switch (code) {
502 case ICMP_SR_FAILED:
503 case ICMP_PORT_UNREACH:
504 /* Impossible event. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800505 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 default:
507 /* All others are translated to HOST_UNREACH.
508 rfc2003 contains "deep thoughts" about NET_UNREACH,
509 I believe they are just ether pollution. --ANK
510 */
511 break;
512 }
513 break;
514 case ICMP_TIME_EXCEEDED:
515 if (code != ICMP_EXC_TTL)
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800516 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700518 case ICMP_REDIRECT:
519 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 }
521
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800522 err = -ENOENT;
523
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000524 t = ipip6_tunnel_lookup(dev_net(skb->dev),
525 skb->dev,
526 iph->daddr,
527 iph->saddr);
David S. Miller36393392012-06-14 22:21:46 -0700528 if (t == NULL)
529 goto out;
530
531 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
532 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
533 t->dev->ifindex, 0, IPPROTO_IPV6, 0);
534 err = 0;
535 goto out;
536 }
David S. Millerec18d9a2012-07-12 00:25:15 -0700537 if (type == ICMP_REDIRECT) {
538 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
539 IPPROTO_IPV6, 0);
540 err = 0;
541 goto out;
542 }
David S. Miller36393392012-06-14 22:21:46 -0700543
544 if (t->parms.iph.daddr == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 goto out;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800546
547 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
549 goto out;
550
Wei Yongjunbb800872009-02-24 23:37:19 -0800551 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 t->err_count++;
553 else
554 t->err_count = 1;
555 t->err_time = jiffies;
556out:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800557 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558}
559
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000560static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
561 const struct in6_addr *v6addr)
562{
563 __be32 v4embed = 0;
564 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
565 return true;
566 return false;
567}
568
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300569/* Checks if an address matches an address on the tunnel interface.
570 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
571 * Long story:
572 * This function is called after we considered the packet as spoofed
573 * in is_spoofed_6rd.
574 * We may have a router that is doing NAT for proto 41 packets
575 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
576 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
577 * function will return true, dropping the packet.
578 * But, we can still check if is spoofed against the IP
579 * addresses associated with the interface.
580 */
581static bool only_dnatted(const struct ip_tunnel *tunnel,
582 const struct in6_addr *v6dst)
583{
584 int prefix_len;
585
586#ifdef CONFIG_IPV6_SIT_6RD
587 prefix_len = tunnel->ip6rd.prefixlen + 32
588 - tunnel->ip6rd.relay_prefixlen;
589#else
590 prefix_len = 48;
591#endif
592 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
593}
594
595/* Returns true if a packet is spoofed */
596static bool packet_is_spoofed(struct sk_buff *skb,
597 const struct iphdr *iph,
598 struct ip_tunnel *tunnel)
599{
600 const struct ipv6hdr *ipv6h;
601
602 if (tunnel->dev->priv_flags & IFF_ISATAP) {
603 if (!isatap_chksrc(skb, iph, tunnel))
604 return true;
605
606 return false;
607 }
608
609 if (tunnel->dev->flags & IFF_POINTOPOINT)
610 return false;
611
612 ipv6h = ipv6_hdr(skb);
613
614 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
615 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
616 &iph->saddr, &ipv6h->saddr,
617 &iph->daddr, &ipv6h->daddr);
618 return true;
619 }
620
621 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
622 return false;
623
624 if (only_dnatted(tunnel, &ipv6h->daddr))
625 return false;
626
627 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
628 &iph->saddr, &ipv6h->saddr,
629 &iph->daddr, &ipv6h->daddr);
630 return true;
631}
632
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633static int ipip6_rcv(struct sk_buff *skb)
634{
Hannes Frederic Sowa1ad759d2013-01-18 09:18:17 +0000635 const struct iphdr *iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 struct ip_tunnel *tunnel;
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000637 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000639 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
640 iph->saddr, iph->daddr);
641 if (tunnel != NULL) {
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000642 struct pcpu_tstats *tstats;
643
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000644 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
645 tunnel->parms.iph.protocol != 0)
646 goto out;
647
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700648 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700649 skb_reset_network_header(skb);
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800650 IPCB(skb)->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 skb->protocol = htons(ETH_P_IPV6);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100652
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300653 if (packet_is_spoofed(skb, iph, tunnel)) {
654 tunnel->dev->stats.rx_errors++;
655 goto out;
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000656 }
657
Nicolas Dichtelea231922013-09-02 15:34:58 +0200658 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000659
660 err = IP_ECN_decapsulate(iph, skb);
661 if (unlikely(err)) {
662 if (log_ecn_error)
663 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
664 &iph->saddr, iph->tos);
665 if (err > 1) {
666 ++tunnel->dev->stats.rx_frame_errors;
667 ++tunnel->dev->stats.rx_errors;
668 goto out;
669 }
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100670 }
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700671
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000672 tstats = this_cpu_ptr(tunnel->dev->tstats);
673 tstats->rx_packets++;
674 tstats->rx_bytes += skb->len;
675
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000676 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000677
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 return 0;
679 }
680
David McCullough6dcdd1b2010-11-29 19:32:34 +0000681 /* no tunnel matched, let upstream know, ipsec may handle it */
David McCullough6dcdd1b2010-11-29 19:32:34 +0000682 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683out:
David S. Miller36ca34c2008-05-08 23:40:26 -0700684 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 return 0;
686}
687
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000688static const struct tnl_ptk_info tpi = {
689 /* no tunnel info required for ipip. */
690 .proto = htons(ETH_P_IP),
691};
692
693static int ipip_rcv(struct sk_buff *skb)
694{
Pravin B Shelar3d7b46c2013-06-17 17:50:02 -0700695 const struct iphdr *iph;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000696 struct ip_tunnel *tunnel;
697
Pravin B Shelar3d7b46c2013-06-17 17:50:02 -0700698 iph = ip_hdr(skb);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000699 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
700 iph->saddr, iph->daddr);
701 if (tunnel != NULL) {
702 if (tunnel->parms.iph.protocol != IPPROTO_IPIP &&
703 tunnel->parms.iph.protocol != 0)
704 goto drop;
705
706 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
707 goto drop;
Li Hongjun737e8282013-08-28 11:54:50 +0200708 if (iptunnel_pull_header(skb, 0, tpi.proto))
709 goto drop;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000710 return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
711 }
712
713 return 1;
714
715drop:
716 kfree_skb(skb);
717 return 0;
718}
719
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000720/*
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000721 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
722 * stores the embedded IPv4 address in v4dst and returns true.
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000723 */
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000724static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
725 __be32 *v4dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726{
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000727#ifdef CONFIG_IPV6_SIT_6RD
728 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
729 tunnel->ip6rd.prefixlen)) {
Eric Dumazet3a43be32010-09-15 11:35:10 +0000730 unsigned int pbw0, pbi0;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000731 int pbi1;
732 u32 d;
733
734 pbw0 = tunnel->ip6rd.prefixlen >> 5;
735 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
736
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000737 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000738 tunnel->ip6rd.relay_prefixlen;
739
740 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
741 if (pbi1 > 0)
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000742 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000743 (32 - pbi1);
744
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000745 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
746 return true;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000747 }
748#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 if (v6dst->s6_addr16[0] == htons(0x2002)) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900750 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000751 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
752 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 }
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000754#endif
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000755 return false;
756}
757
758static inline __be32 try_6rd(struct ip_tunnel *tunnel,
759 const struct in6_addr *v6dst)
760{
761 __be32 dst = 0;
762 check_6rd(tunnel, v6dst, &dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 return dst;
764}
765
766/*
767 * This function assumes it is being called from dev_queue_xmit()
768 * and that skb is filled properly by that function.
769 */
770
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000771static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
772 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773{
Patrick McHardy2941a482006-01-08 22:05:26 -0800774 struct ip_tunnel *tunnel = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000775 const struct iphdr *tiph = &tunnel->parms.iph;
776 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 u8 tos = tunnel->parms.iph.tos;
Herbert Xu292f4f32009-11-09 08:42:01 +0000778 __be16 df = tiph->frag_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 struct rtable *rt; /* Route to the other host */
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000780 struct net_device *tdev; /* Device to other host */
Chuck Leverc2636b42007-10-23 21:07:32 -0700781 unsigned int max_headroom; /* The extra header space needed */
Al Viroe69a4adc2006-11-14 20:56:00 -0800782 __be32 dst = tiph->daddr;
David S. Miller31e45432011-05-03 20:25:42 -0700783 struct flowi4 fl4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 int mtu;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000785 const struct in6_addr *addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 int addr_type;
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700787 u8 ttl;
788 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 if (skb->protocol != htons(ETH_P_IPV6))
791 goto tx_error;
792
Lionel Elie Mamanec2bceb32011-08-13 14:04:38 +0000793 if (tos == 1)
794 tos = ipv6_get_dsfield(iph6);
795
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100796 /* ISATAP (RFC4214) - must come before 6to4 */
797 if (dev->priv_flags & IFF_ISATAP) {
798 struct neighbour *neigh = NULL;
David S. Miller1e2927b2012-01-26 15:23:21 -0500799 bool do_tx_error = false;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100800
Eric Dumazetadf30902009-06-02 05:19:30 +0000801 if (skb_dst(skb))
David S. Miller1e2927b2012-01-26 15:23:21 -0500802 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100803
804 if (neigh == NULL) {
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300805 net_dbg_ratelimited("nexthop == NULL\n");
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100806 goto tx_error;
807 }
808
Eldad Zack3e866702012-04-01 07:49:01 +0000809 addr6 = (const struct in6_addr *)&neigh->primary_key;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100810 addr_type = ipv6_addr_type(addr6);
811
812 if ((addr_type & IPV6_ADDR_UNICAST) &&
813 ipv6_addr_is_isatap(addr6))
814 dst = addr6->s6_addr32[3];
815 else
David S. Miller1e2927b2012-01-26 15:23:21 -0500816 do_tx_error = true;
817
818 neigh_release(neigh);
819 if (do_tx_error)
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100820 goto tx_error;
821 }
822
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 if (!dst)
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000824 dst = try_6rd(tunnel, &iph6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
826 if (!dst) {
827 struct neighbour *neigh = NULL;
David S. Miller1e2927b2012-01-26 15:23:21 -0500828 bool do_tx_error = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
Eric Dumazetadf30902009-06-02 05:19:30 +0000830 if (skb_dst(skb))
David S. Miller1e2927b2012-01-26 15:23:21 -0500831 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
833 if (neigh == NULL) {
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300834 net_dbg_ratelimited("nexthop == NULL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 goto tx_error;
836 }
837
Eldad Zack3e866702012-04-01 07:49:01 +0000838 addr6 = (const struct in6_addr *)&neigh->primary_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 addr_type = ipv6_addr_type(addr6);
840
841 if (addr_type == IPV6_ADDR_ANY) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700842 addr6 = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 addr_type = ipv6_addr_type(addr6);
844 }
845
David S. Miller1e2927b2012-01-26 15:23:21 -0500846 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
847 dst = addr6->s6_addr32[3];
848 else
849 do_tx_error = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
David S. Miller1e2927b2012-01-26 15:23:21 -0500851 neigh_release(neigh);
852 if (do_tx_error)
853 goto tx_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 }
855
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +0200856 rt = ip_route_output_ports(tunnel->net, &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500857 dst, tiph->saddr,
858 0, 0,
859 IPPROTO_IPV6, RT_TOS(tos),
860 tunnel->parms.link);
861 if (IS_ERR(rt)) {
862 dev->stats.tx_carrier_errors++;
863 goto tx_error_icmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 }
865 if (rt->rt_type != RTN_UNICAST) {
866 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000867 dev->stats.tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 goto tx_error_icmp;
869 }
Changli Gaod8d1f302010-06-10 23:31:35 -0700870 tdev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
872 if (tdev == dev) {
873 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000874 dev->stats.collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 goto tx_error;
876 }
877
Herbert Xu292f4f32009-11-09 08:42:01 +0000878 if (df) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700879 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
Herbert Xu292f4f32009-11-09 08:42:01 +0000881 if (mtu < 68) {
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000882 dev->stats.collisions++;
Herbert Xu292f4f32009-11-09 08:42:01 +0000883 ip_rt_put(rt);
884 goto tx_error;
885 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
Herbert Xu292f4f32009-11-09 08:42:01 +0000887 if (mtu < IPV6_MIN_MTU) {
888 mtu = IPV6_MIN_MTU;
889 df = 0;
890 }
891
892 if (tunnel->parms.iph.daddr && skb_dst(skb))
David S. Miller6700c272012-07-17 03:29:28 -0700893 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
Herbert Xu292f4f32009-11-09 08:42:01 +0000894
895 if (skb->len > mtu) {
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000896 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Herbert Xu292f4f32009-11-09 08:42:01 +0000897 ip_rt_put(rt);
898 goto tx_error;
899 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 }
901
902 if (tunnel->err_count > 0) {
Wei Yongjunbb800872009-02-24 23:37:19 -0800903 if (time_before(jiffies,
904 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 tunnel->err_count--;
906 dst_link_failure(skb);
907 } else
908 tunnel->err_count = 0;
909 }
910
911 /*
912 * Okay, now see if we can stuff it in the buffer as-is.
913 */
914 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
915
Patrick McHardycfbba492007-07-09 15:33:40 -0700916 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
917 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
919 if (!new_skb) {
920 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000921 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000923 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 }
925 if (skb->sk)
926 skb_set_owner_w(new_skb, skb->sk);
927 dev_kfree_skb(skb);
928 skb = new_skb;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700929 iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 }
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700931 ttl = tiph->ttl;
932 if (ttl == 0)
933 ttl = iph6->hop_limit;
934 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935
Eric Dumazet61c1db72013-10-20 20:47:30 -0700936 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT);
937 if (IS_ERR(skb))
938 goto out;
Hannes Frederic Sowa3d483052013-08-18 13:46:52 +0200939
Nicolas Dichtel8b7ed2d2013-09-02 15:34:54 +0200940 err = iptunnel_xmit(rt, skb, fl4.saddr, fl4.daddr, IPPROTO_IPV6, tos,
Nicolas Dichtel963a88b2013-09-02 15:34:57 +0200941 ttl, df, !net_eq(tunnel->net, dev_net(dev)));
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700942 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000943 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944
945tx_error_icmp:
946 dst_link_failure(skb);
947tx_error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 dev_kfree_skb(skb);
Eric Dumazet61c1db72013-10-20 20:47:30 -0700949out:
950 dev->stats.tx_errors++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000951 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952}
953
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000954static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
955{
956 struct ip_tunnel *tunnel = netdev_priv(dev);
957 const struct iphdr *tiph = &tunnel->parms.iph;
958
Eric Dumazet61c1db72013-10-20 20:47:30 -0700959 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP);
960 if (IS_ERR(skb))
961 goto out;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000962
963 ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP);
964 return NETDEV_TX_OK;
Eric Dumazet61c1db72013-10-20 20:47:30 -0700965out:
966 dev->stats.tx_errors++;
967 return NETDEV_TX_OK;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000968}
969
970static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
971 struct net_device *dev)
972{
973 switch (skb->protocol) {
974 case htons(ETH_P_IP):
975 ipip_tunnel_xmit(skb, dev);
976 break;
977 case htons(ETH_P_IPV6):
978 ipip6_tunnel_xmit(skb, dev);
979 break;
980 default:
981 goto tx_err;
982 }
983
984 return NETDEV_TX_OK;
985
986tx_err:
987 dev->stats.tx_errors++;
988 dev_kfree_skb(skb);
989 return NETDEV_TX_OK;
990
991}
992
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800993static void ipip6_tunnel_bind_dev(struct net_device *dev)
994{
995 struct net_device *tdev = NULL;
996 struct ip_tunnel *tunnel;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000997 const struct iphdr *iph;
David S. Miller31e45432011-05-03 20:25:42 -0700998 struct flowi4 fl4;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800999
1000 tunnel = netdev_priv(dev);
1001 iph = &tunnel->parms.iph;
1002
1003 if (iph->daddr) {
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001004 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1005 NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -05001006 iph->daddr, iph->saddr,
1007 0, 0,
1008 IPPROTO_IPV6,
1009 RT_TOS(iph->tos),
1010 tunnel->parms.link);
David S. Millerb23dd4f2011-03-02 14:31:35 -08001011
1012 if (!IS_ERR(rt)) {
Changli Gaod8d1f302010-06-10 23:31:35 -07001013 tdev = rt->dst.dev;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001014 ip_rt_put(rt);
1015 }
1016 dev->flags |= IFF_POINTOPOINT;
1017 }
1018
1019 if (!tdev && tunnel->parms.link)
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001020 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001021
1022 if (tdev) {
1023 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
1024 dev->mtu = tdev->mtu - sizeof(struct iphdr);
1025 if (dev->mtu < IPV6_MIN_MTU)
1026 dev->mtu = IPV6_MIN_MTU;
1027 }
1028 dev->iflink = tunnel->parms.link;
1029}
1030
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001031static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
1032{
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001033 struct net *net = t->net;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001034 struct sit_net *sitn = net_generic(net, sit_net_id);
1035
1036 ipip6_tunnel_unlink(sitn, t);
1037 synchronize_net();
1038 t->parms.iph.saddr = p->iph.saddr;
1039 t->parms.iph.daddr = p->iph.daddr;
1040 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1041 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1042 ipip6_tunnel_link(sitn, t);
1043 t->parms.iph.ttl = p->iph.ttl;
1044 t->parms.iph.tos = p->iph.tos;
1045 if (t->parms.link != p->link) {
1046 t->parms.link = p->link;
1047 ipip6_tunnel_bind_dev(t->dev);
1048 }
1049 netdev_state_change(t->dev);
1050}
1051
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001052#ifdef CONFIG_IPV6_SIT_6RD
1053static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1054 struct ip_tunnel_6rd *ip6rd)
1055{
1056 struct in6_addr prefix;
1057 __be32 relay_prefix;
1058
1059 if (ip6rd->relay_prefixlen > 32 ||
1060 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1061 return -EINVAL;
1062
1063 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1064 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1065 return -EINVAL;
1066 if (ip6rd->relay_prefixlen)
1067 relay_prefix = ip6rd->relay_prefix &
1068 htonl(0xffffffffUL <<
1069 (32 - ip6rd->relay_prefixlen));
1070 else
1071 relay_prefix = 0;
1072 if (relay_prefix != ip6rd->relay_prefix)
1073 return -EINVAL;
1074
1075 t->ip6rd.prefix = prefix;
1076 t->ip6rd.relay_prefix = relay_prefix;
1077 t->ip6rd.prefixlen = ip6rd->prefixlen;
1078 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1079 netdev_state_change(t->dev);
1080 return 0;
1081}
1082#endif
1083
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084static int
1085ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
1086{
1087 int err = 0;
1088 struct ip_tunnel_parm p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001089 struct ip_tunnel_prl prl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 struct ip_tunnel *t;
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001091 struct net *net = dev_net(dev);
1092 struct sit_net *sitn = net_generic(net, sit_net_id);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001093#ifdef CONFIG_IPV6_SIT_6RD
1094 struct ip_tunnel_6rd ip6rd;
1095#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
1097 switch (cmd) {
1098 case SIOCGETTUNNEL:
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001099#ifdef CONFIG_IPV6_SIT_6RD
1100 case SIOCGET6RD:
1101#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 t = NULL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001103 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1105 err = -EFAULT;
1106 break;
1107 }
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001108 t = ipip6_tunnel_locate(net, &p, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 }
1110 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -08001111 t = netdev_priv(dev);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001112
1113 err = -EFAULT;
1114 if (cmd == SIOCGETTUNNEL) {
1115 memcpy(&p, &t->parms, sizeof(p));
1116 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1117 sizeof(p)))
1118 goto done;
1119#ifdef CONFIG_IPV6_SIT_6RD
1120 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001121 ip6rd.prefix = t->ip6rd.prefix;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001122 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1123 ip6rd.prefixlen = t->ip6rd.prefixlen;
1124 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1125 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1126 sizeof(ip6rd)))
1127 goto done;
1128#endif
1129 }
1130 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 break;
1132
1133 case SIOCADDTUNNEL:
1134 case SIOCCHGTUNNEL:
1135 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001136 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 goto done;
1138
1139 err = -EFAULT;
1140 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1141 goto done;
1142
1143 err = -EINVAL;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001144 if (p.iph.protocol != IPPROTO_IPV6 &&
1145 p.iph.protocol != IPPROTO_IPIP &&
1146 p.iph.protocol != 0)
1147 goto done;
1148 if (p.iph.version != 4 ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1150 goto done;
1151 if (p.iph.ttl)
1152 p.iph.frag_off |= htons(IP_DF);
1153
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001154 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001156 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 if (t != NULL) {
1158 if (t->dev != dev) {
1159 err = -EEXIST;
1160 break;
1161 }
1162 } else {
1163 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1164 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1165 err = -EINVAL;
1166 break;
1167 }
Patrick McHardy2941a482006-01-08 22:05:26 -08001168 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 }
Nicolas Dichtelf9cd5a52012-11-14 05:14:04 +00001170
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001171 ipip6_tunnel_update(t, &p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 }
1173
1174 if (t) {
1175 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1177 err = -EFAULT;
1178 } else
1179 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1180 break;
1181
1182 case SIOCDELTUNNEL:
1183 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001184 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 goto done;
1186
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001187 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 err = -EFAULT;
1189 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1190 goto done;
1191 err = -ENOENT;
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001192 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 goto done;
1194 err = -EPERM;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001195 if (t == netdev_priv(sitn->fb_tunnel_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 goto done;
1197 dev = t->dev;
1198 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001199 unregister_netdevice(dev);
1200 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 break;
1202
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001203 case SIOCGETPRL:
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001204 err = -EINVAL;
1205 if (dev == sitn->fb_tunnel_dev)
1206 goto done;
1207 err = -ENOENT;
1208 if (!(t = netdev_priv(dev)))
1209 goto done;
1210 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1211 break;
1212
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001213 case SIOCADDPRL:
1214 case SIOCDELPRL:
1215 case SIOCCHGPRL:
1216 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001217 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001218 goto done;
1219 err = -EINVAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001220 if (dev == sitn->fb_tunnel_dev)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001221 goto done;
1222 err = -EFAULT;
1223 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1224 goto done;
1225 err = -ENOENT;
1226 if (!(t = netdev_priv(dev)))
1227 goto done;
1228
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001229 switch (cmd) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001230 case SIOCDELPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001231 err = ipip6_tunnel_del_prl(t, &prl);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001232 break;
1233 case SIOCADDPRL:
1234 case SIOCCHGPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001235 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001236 break;
1237 }
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001238 netdev_state_change(dev);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001239 break;
1240
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001241#ifdef CONFIG_IPV6_SIT_6RD
1242 case SIOCADD6RD:
1243 case SIOCCHG6RD:
1244 case SIOCDEL6RD:
1245 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001246 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001247 goto done;
1248
1249 err = -EFAULT;
1250 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1251 sizeof(ip6rd)))
1252 goto done;
1253
1254 t = netdev_priv(dev);
1255
1256 if (cmd != SIOCDEL6RD) {
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001257 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1258 if (err < 0)
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001259 goto done;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001260 } else
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001261 ipip6_tunnel_clone_6rd(dev, sitn);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001262
1263 err = 0;
1264 break;
1265#endif
1266
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 default:
1268 err = -EINVAL;
1269 }
1270
1271done:
1272 return err;
1273}
1274
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1276{
1277 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1278 return -EINVAL;
1279 dev->mtu = new_mtu;
1280 return 0;
1281}
1282
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001283static const struct net_device_ops ipip6_netdev_ops = {
1284 .ndo_uninit = ipip6_tunnel_uninit,
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001285 .ndo_start_xmit = sit_tunnel_xmit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001286 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1287 .ndo_change_mtu = ipip6_tunnel_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +00001288 .ndo_get_stats64 = ip_tunnel_get_stats64,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001289};
1290
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001291static void ipip6_dev_free(struct net_device *dev)
1292{
1293 free_percpu(dev->tstats);
1294 free_netdev(dev);
1295}
1296
Eric Dumazet61c1db72013-10-20 20:47:30 -07001297#define SIT_FEATURES (NETIF_F_SG | \
1298 NETIF_F_FRAGLIST | \
1299 NETIF_F_HIGHDMA | \
1300 NETIF_F_GSO_SOFTWARE | \
1301 NETIF_F_HW_CSUM)
1302
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303static void ipip6_tunnel_setup(struct net_device *dev)
1304{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001305 dev->netdev_ops = &ipip6_netdev_ops;
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001306 dev->destructor = ipip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307
1308 dev->type = ARPHRD_SIT;
1309 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
Kris Katterjohn46f25df2006-01-05 16:35:42 -08001310 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 dev->flags = IFF_NOARP;
Sascha Hlusiakf2ba0252009-07-11 20:30:52 -07001312 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 dev->iflink = 0;
1314 dev->addr_len = 4;
Eric Dumazet8df40d12010-09-28 02:53:41 +00001315 dev->features |= NETIF_F_LLTX;
Eric Dumazet61c1db72013-10-20 20:47:30 -07001316 dev->features |= SIT_FEATURES;
1317 dev->hw_features |= SIT_FEATURES;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318}
1319
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001320static int ipip6_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001322 struct ip_tunnel *tunnel = netdev_priv(dev);
John Stultz827da442013-10-07 15:51:58 -07001323 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324
1325 tunnel->dev = dev;
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001326 tunnel->net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327
1328 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1329 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1330
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001331 ipip6_tunnel_bind_dev(dev);
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001332 dev->tstats = alloc_percpu(struct pcpu_tstats);
1333 if (!dev->tstats)
1334 return -ENOMEM;
1335
John Stultz827da442013-10-07 15:51:58 -07001336 for_each_possible_cpu(i) {
1337 struct pcpu_tstats *ipip6_tunnel_stats;
1338 ipip6_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1339 u64_stats_init(&ipip6_tunnel_stats->syncp);
1340 }
1341
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001342 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343}
1344
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001345static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346{
Patrick McHardy2941a482006-01-08 22:05:26 -08001347 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 struct iphdr *iph = &tunnel->parms.iph;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001349 struct net *net = dev_net(dev);
1350 struct sit_net *sitn = net_generic(net, sit_net_id);
John Stultz827da442013-10-07 15:51:58 -07001351 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352
1353 tunnel->dev = dev;
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001354 tunnel->net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 strcpy(tunnel->parms.name, dev->name);
1356
1357 iph->version = 4;
1358 iph->protocol = IPPROTO_IPV6;
1359 iph->ihl = 5;
1360 iph->ttl = 64;
1361
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001362 dev->tstats = alloc_percpu(struct pcpu_tstats);
1363 if (!dev->tstats)
1364 return -ENOMEM;
John Stultz827da442013-10-07 15:51:58 -07001365
1366 for_each_possible_cpu(i) {
1367 struct pcpu_tstats *ipip6_fb_stats;
1368 ipip6_fb_stats = per_cpu_ptr(dev->tstats, i);
1369 u64_stats_init(&ipip6_fb_stats->syncp);
1370 }
1371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 dev_hold(dev);
Eric Dumazetcf778b02012-01-12 04:41:32 +00001373 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001374 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375}
1376
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001377static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
1378{
1379 u8 proto;
1380
Nicolas Dichtelc2ff6822013-06-19 12:03:13 +02001381 if (!data || !data[IFLA_IPTUN_PROTO])
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001382 return 0;
1383
1384 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1385 if (proto != IPPROTO_IPV6 &&
1386 proto != IPPROTO_IPIP &&
1387 proto != 0)
1388 return -EINVAL;
1389
1390 return 0;
1391}
1392
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001393static void ipip6_netlink_parms(struct nlattr *data[],
1394 struct ip_tunnel_parm *parms)
1395{
1396 memset(parms, 0, sizeof(*parms));
1397
1398 parms->iph.version = 4;
1399 parms->iph.protocol = IPPROTO_IPV6;
1400 parms->iph.ihl = 5;
1401 parms->iph.ttl = 64;
1402
1403 if (!data)
1404 return;
1405
1406 if (data[IFLA_IPTUN_LINK])
1407 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1408
1409 if (data[IFLA_IPTUN_LOCAL])
Nicolas Dichteld440b722012-11-15 04:06:41 +00001410 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001411
1412 if (data[IFLA_IPTUN_REMOTE])
Nicolas Dichteld440b722012-11-15 04:06:41 +00001413 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001414
1415 if (data[IFLA_IPTUN_TTL]) {
1416 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1417 if (parms->iph.ttl)
1418 parms->iph.frag_off = htons(IP_DF);
1419 }
1420
1421 if (data[IFLA_IPTUN_TOS])
1422 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1423
1424 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1425 parms->iph.frag_off = htons(IP_DF);
1426
1427 if (data[IFLA_IPTUN_FLAGS])
Nicolas Dichteld440b722012-11-15 04:06:41 +00001428 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001429
1430 if (data[IFLA_IPTUN_PROTO])
1431 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1432
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001433}
1434
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001435#ifdef CONFIG_IPV6_SIT_6RD
1436/* This function returns true when 6RD attributes are present in the nl msg */
1437static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1438 struct ip_tunnel_6rd *ip6rd)
1439{
1440 bool ret = false;
1441 memset(ip6rd, 0, sizeof(*ip6rd));
1442
1443 if (!data)
1444 return ret;
1445
1446 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1447 ret = true;
1448 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1449 sizeof(struct in6_addr));
1450 }
1451
1452 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1453 ret = true;
1454 ip6rd->relay_prefix =
1455 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1456 }
1457
1458 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1459 ret = true;
1460 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1461 }
1462
1463 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1464 ret = true;
1465 ip6rd->relay_prefixlen =
1466 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1467 }
1468
1469 return ret;
1470}
1471#endif
1472
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001473static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1474 struct nlattr *tb[], struct nlattr *data[])
1475{
1476 struct net *net = dev_net(dev);
1477 struct ip_tunnel *nt;
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001478#ifdef CONFIG_IPV6_SIT_6RD
1479 struct ip_tunnel_6rd ip6rd;
1480#endif
1481 int err;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001482
1483 nt = netdev_priv(dev);
1484 ipip6_netlink_parms(data, &nt->parms);
1485
1486 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1487 return -EEXIST;
1488
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001489 err = ipip6_tunnel_create(dev);
1490 if (err < 0)
1491 return err;
1492
1493#ifdef CONFIG_IPV6_SIT_6RD
1494 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1495 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1496#endif
1497
1498 return err;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001499}
1500
1501static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1502 struct nlattr *data[])
1503{
Nicolas Dichtel86bd68b2013-07-03 17:00:34 +02001504 struct ip_tunnel *t = netdev_priv(dev);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001505 struct ip_tunnel_parm p;
Nicolas Dichtel86bd68b2013-07-03 17:00:34 +02001506 struct net *net = t->net;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001507 struct sit_net *sitn = net_generic(net, sit_net_id);
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001508#ifdef CONFIG_IPV6_SIT_6RD
1509 struct ip_tunnel_6rd ip6rd;
1510#endif
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001511
1512 if (dev == sitn->fb_tunnel_dev)
1513 return -EINVAL;
1514
1515 ipip6_netlink_parms(data, &p);
1516
1517 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1518 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1519 return -EINVAL;
1520
1521 t = ipip6_tunnel_locate(net, &p, 0);
1522
1523 if (t) {
1524 if (t->dev != dev)
1525 return -EEXIST;
1526 } else
1527 t = netdev_priv(dev);
1528
1529 ipip6_tunnel_update(t, &p);
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001530
1531#ifdef CONFIG_IPV6_SIT_6RD
1532 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1533 return ipip6_tunnel_update_6rd(t, &ip6rd);
1534#endif
1535
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001536 return 0;
1537}
1538
Nicolas Dichtele4c94a92012-11-14 05:14:06 +00001539static size_t ipip6_get_size(const struct net_device *dev)
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001540{
1541 return
1542 /* IFLA_IPTUN_LINK */
1543 nla_total_size(4) +
1544 /* IFLA_IPTUN_LOCAL */
1545 nla_total_size(4) +
1546 /* IFLA_IPTUN_REMOTE */
1547 nla_total_size(4) +
1548 /* IFLA_IPTUN_TTL */
1549 nla_total_size(1) +
1550 /* IFLA_IPTUN_TOS */
1551 nla_total_size(1) +
Nicolas Dichtela12c9a82012-11-14 05:14:05 +00001552 /* IFLA_IPTUN_PMTUDISC */
1553 nla_total_size(1) +
1554 /* IFLA_IPTUN_FLAGS */
1555 nla_total_size(2) +
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001556 /* IFLA_IPTUN_PROTO */
1557 nla_total_size(1) +
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001558#ifdef CONFIG_IPV6_SIT_6RD
1559 /* IFLA_IPTUN_6RD_PREFIX */
1560 nla_total_size(sizeof(struct in6_addr)) +
1561 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1562 nla_total_size(4) +
1563 /* IFLA_IPTUN_6RD_PREFIXLEN */
1564 nla_total_size(2) +
1565 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1566 nla_total_size(2) +
1567#endif
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001568 0;
1569}
1570
Nicolas Dichtele4c94a92012-11-14 05:14:06 +00001571static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001572{
1573 struct ip_tunnel *tunnel = netdev_priv(dev);
1574 struct ip_tunnel_parm *parm = &tunnel->parms;
1575
1576 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1577 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1578 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1579 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
Nicolas Dichtela12c9a82012-11-14 05:14:05 +00001580 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1581 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1582 !!(parm->iph.frag_off & htons(IP_DF))) ||
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001583 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
Nicolas Dichteld440b722012-11-15 04:06:41 +00001584 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001585 goto nla_put_failure;
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001586
1587#ifdef CONFIG_IPV6_SIT_6RD
1588 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1589 &tunnel->ip6rd.prefix) ||
1590 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1591 tunnel->ip6rd.relay_prefix) ||
1592 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1593 tunnel->ip6rd.prefixlen) ||
1594 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1595 tunnel->ip6rd.relay_prefixlen))
1596 goto nla_put_failure;
1597#endif
1598
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001599 return 0;
1600
1601nla_put_failure:
1602 return -EMSGSIZE;
1603}
1604
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001605static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1606 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1607 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1608 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1609 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1610 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1611 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1612 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001613 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001614#ifdef CONFIG_IPV6_SIT_6RD
1615 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1616 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1617 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1618 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1619#endif
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001620};
1621
Willem de Bruijn94342662013-11-13 21:27:38 -05001622static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1623{
1624 struct net *net = dev_net(dev);
1625 struct sit_net *sitn = net_generic(net, sit_net_id);
1626
1627 if (dev != sitn->fb_tunnel_dev)
1628 unregister_netdevice_queue(dev, head);
1629}
1630
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001631static struct rtnl_link_ops sit_link_ops __read_mostly = {
1632 .kind = "sit",
1633 .maxtype = IFLA_IPTUN_MAX,
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001634 .policy = ipip6_policy,
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001635 .priv_size = sizeof(struct ip_tunnel),
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001636 .setup = ipip6_tunnel_setup,
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001637 .validate = ipip6_validate,
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001638 .newlink = ipip6_newlink,
1639 .changelink = ipip6_changelink,
Nicolas Dichtele4c94a92012-11-14 05:14:06 +00001640 .get_size = ipip6_get_size,
1641 .fill_info = ipip6_fill_info,
Willem de Bruijn94342662013-11-13 21:27:38 -05001642 .dellink = ipip6_dellink,
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001643};
1644
Eric Dumazet6dcd8142010-08-30 07:04:14 +00001645static struct xfrm_tunnel sit_handler __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 .handler = ipip6_rcv,
1647 .err_handler = ipip6_err,
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001648 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649};
1650
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001651static struct xfrm_tunnel ipip_handler __read_mostly = {
1652 .handler = ipip_rcv,
1653 .err_handler = ipip6_err,
1654 .priority = 2,
1655};
1656
Willem de Bruijn94342662013-11-13 21:27:38 -05001657static void __net_exit sit_destroy_tunnels(struct net *net,
1658 struct list_head *head)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001659{
Willem de Bruijn94342662013-11-13 21:27:38 -05001660 struct sit_net *sitn = net_generic(net, sit_net_id);
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001661 struct net_device *dev, *aux;
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001662 int prio;
1663
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001664 for_each_netdev_safe(net, dev, aux)
1665 if (dev->rtnl_link_ops == &sit_link_ops)
1666 unregister_netdevice_queue(dev, head);
1667
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001668 for (prio = 1; prio < 4; prio++) {
1669 int h;
1670 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001671 struct ip_tunnel *t;
Eric Dumazet62808f92009-10-28 04:37:43 +00001672
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001673 t = rtnl_dereference(sitn->tunnels[prio][h]);
Eric Dumazet62808f92009-10-28 04:37:43 +00001674 while (t != NULL) {
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001675 /* If dev is in the same netns, it has already
1676 * been added to the list by the previous loop.
1677 */
Nicolas Dichtelfc8f9992013-08-13 17:51:10 +02001678 if (!net_eq(dev_net(t->dev), net))
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001679 unregister_netdevice_queue(t->dev,
1680 head);
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001681 t = rtnl_dereference(t->next);
Eric Dumazet62808f92009-10-28 04:37:43 +00001682 }
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001683 }
1684 }
1685}
1686
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001687static int __net_init sit_init_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001688{
Eric W. Biederman67101172009-11-29 15:46:16 +00001689 struct sit_net *sitn = net_generic(net, sit_net_id);
Ted Feng72b36012011-12-08 00:46:21 +00001690 struct ip_tunnel *t;
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001691 int err;
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001692
Pavel Emelyanov29182172008-04-16 01:16:38 -07001693 sitn->tunnels[0] = sitn->tunnels_wc;
1694 sitn->tunnels[1] = sitn->tunnels_l;
1695 sitn->tunnels[2] = sitn->tunnels_r;
1696 sitn->tunnels[3] = sitn->tunnels_r_l;
1697
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001698 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1699 ipip6_tunnel_setup);
1700 if (!sitn->fb_tunnel_dev) {
1701 err = -ENOMEM;
1702 goto err_alloc_dev;
1703 }
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001704 dev_net_set(sitn->fb_tunnel_dev, net);
Nicolas Dichtel205983c2013-10-01 18:04:59 +02001705 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001706 /* FB netdevice is special: we have one, and only one per netns.
1707 * Allowing to move it to another netns is clearly unsafe.
1708 */
1709 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001710
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001711 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1712 if (err)
1713 goto err_dev_free;
1714
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001715 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001716
1717 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1718 goto err_reg_dev;
1719
Ted Feng72b36012011-12-08 00:46:21 +00001720 t = netdev_priv(sitn->fb_tunnel_dev);
1721
1722 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001723 return 0;
1724
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001725err_reg_dev:
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001726 dev_put(sitn->fb_tunnel_dev);
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001727err_dev_free:
1728 ipip6_dev_free(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001729err_alloc_dev:
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001730 return err;
1731}
1732
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001733static void __net_exit sit_exit_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001734{
Eric Dumazet62808f92009-10-28 04:37:43 +00001735 LIST_HEAD(list);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001736
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001737 rtnl_lock();
Willem de Bruijn94342662013-11-13 21:27:38 -05001738 sit_destroy_tunnels(net, &list);
Eric Dumazet62808f92009-10-28 04:37:43 +00001739 unregister_netdevice_many(&list);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001740 rtnl_unlock();
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001741}
1742
1743static struct pernet_operations sit_net_ops = {
1744 .init = sit_init_net,
1745 .exit = sit_exit_net,
Eric W. Biederman67101172009-11-29 15:46:16 +00001746 .id = &sit_net_id,
1747 .size = sizeof(struct sit_net),
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001748};
1749
Adrian Bunk89c89452006-11-20 16:56:48 -08001750static void __exit sit_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751{
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001752 rtnl_link_unregister(&sit_link_ops);
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001753 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001754 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001755
Eric W. Biederman67101172009-11-29 15:46:16 +00001756 unregister_pernet_device(&sit_net_ops);
Eric Dumazetef9a9d12009-10-23 17:51:26 +00001757 rcu_barrier(); /* Wait for completion of call_rcu()'s */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758}
1759
Adrian Bunk89c89452006-11-20 16:56:48 -08001760static int __init sit_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761{
1762 int err;
1763
Joe Perchesf3213832012-05-15 14:11:53 +00001764 pr_info("IPv6 over IPv4 tunneling driver\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765
Eric W. Biederman67101172009-11-29 15:46:16 +00001766 err = register_pernet_device(&sit_net_ops);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001767 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001768 return err;
1769 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1770 if (err < 0) {
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001771 pr_info("%s: can't register ip6ip4\n", __func__);
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001772 goto xfrm_tunnel_failed;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001773 }
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001774 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1775 if (err < 0) {
1776 pr_info("%s: can't register ip4ip4\n", __func__);
1777 goto xfrm_tunnel4_failed;
1778 }
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001779 err = rtnl_link_register(&sit_link_ops);
1780 if (err < 0)
1781 goto rtnl_link_failed;
1782
1783out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784 return err;
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001785
1786rtnl_link_failed:
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001787 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1788xfrm_tunnel4_failed:
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001789 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1790xfrm_tunnel_failed:
1791 unregister_pernet_device(&sit_net_ops);
1792 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793}
Joerg Roedel989e5b92006-10-10 14:47:44 -07001794
1795module_init(sit_init);
1796module_exit(sit_cleanup);
Jan Dittmer39c85082006-10-13 15:05:53 -07001797MODULE_LICENSE("GPL");
Vasiliy Kulikov8909c9a2011-03-02 00:33:13 +03001798MODULE_ALIAS_NETDEV("sit0");