blob: a7a18602a046e1ffe5f0f00883844459802f4a25 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <asm/uaccess.h>
33#include <linux/init.h>
34#include <linux/netfilter_ipv4.h>
Kris Katterjohn46f25df2006-01-05 16:35:42 -080035#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#include <net/sock.h>
38#include <net/snmp.h>
39
40#include <net/ipv6.h>
41#include <net/protocol.h>
42#include <net/transp_v6.h>
43#include <net/ip6_fib.h>
44#include <net/ip6_route.h>
45#include <net/ndisc.h>
46#include <net/addrconf.h>
47#include <net/ip.h>
48#include <net/udp.h>
49#include <net/icmp.h>
50#include <net/ipip.h>
51#include <net/inet_ecn.h>
52#include <net/xfrm.h>
53#include <net/dsfield.h>
Pavel Emelyanov8190d902008-04-16 01:15:17 -070054#include <net/net_namespace.h>
55#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57/*
58 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
59
60 For comments look at net/ipv4/ip_gre.c --ANK
61 */
62
63#define HASH_SIZE 16
Al Viroe69a4ad2006-11-14 20:56:00 -080064#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Eric Dumazet15fc1f72010-09-27 00:38:18 +000066static int ipip6_tunnel_init(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067static void ipip6_tunnel_setup(struct net_device *dev);
Eric Dumazet15fc1f72010-09-27 00:38:18 +000068static void ipip6_dev_free(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Eric Dumazetf99189b2009-11-17 10:42:49 +000070static int sit_net_id __read_mostly;
Pavel Emelyanov8190d902008-04-16 01:15:17 -070071struct sit_net {
Eric Dumazet3a43be32010-09-15 11:35:10 +000072 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
73 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
74 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
75 struct ip_tunnel __rcu *tunnels_wc[1];
76 struct ip_tunnel __rcu **tunnels[4];
Pavel Emelyanov29182172008-04-16 01:16:38 -070077
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -070078 struct net_device *fb_tunnel_dev;
Pavel Emelyanov8190d902008-04-16 01:15:17 -070079};
80
Eric Dumazet4543c102009-10-23 17:52:14 +000081/*
Eric Dumazet3a43be32010-09-15 11:35:10 +000082 * Locking : hash tables are protected by RCU and RTNL
Eric Dumazet4543c102009-10-23 17:52:14 +000083 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Eric Dumazet4543c102009-10-23 17:52:14 +000085#define for_each_ip_tunnel_rcu(start) \
86 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
87
Eric Dumazet15fc1f72010-09-27 00:38:18 +000088/* often modified stats are per cpu, other are shared (netdev->stats) */
89struct pcpu_tstats {
90 unsigned long rx_packets;
91 unsigned long rx_bytes;
92 unsigned long tx_packets;
93 unsigned long tx_bytes;
94};
95
96static struct net_device_stats *ipip6_get_stats(struct net_device *dev)
97{
98 struct pcpu_tstats sum = { 0 };
99 int i;
100
101 for_each_possible_cpu(i) {
102 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
103
104 sum.rx_packets += tstats->rx_packets;
105 sum.rx_bytes += tstats->rx_bytes;
106 sum.tx_packets += tstats->tx_packets;
107 sum.tx_bytes += tstats->tx_bytes;
108 }
109 dev->stats.rx_packets = sum.rx_packets;
110 dev->stats.rx_bytes = sum.rx_bytes;
111 dev->stats.tx_packets = sum.tx_packets;
112 dev->stats.tx_bytes = sum.tx_bytes;
113 return &dev->stats;
114}
Eric Dumazet4543c102009-10-23 17:52:14 +0000115/*
116 * Must be invoked with rcu_read_lock
117 */
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700118static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000119 struct net_device *dev, __be32 remote, __be32 local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120{
Eric Dumazet3a43be32010-09-15 11:35:10 +0000121 unsigned int h0 = HASH(remote);
122 unsigned int h1 = HASH(local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 struct ip_tunnel *t;
Pavel Emelyanov29182172008-04-16 01:16:38 -0700124 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Eric Dumazet4543c102009-10-23 17:52:14 +0000126 for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000128 remote == t->parms.iph.daddr &&
129 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
130 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 return t;
132 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000133 for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000134 if (remote == t->parms.iph.daddr &&
135 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
136 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 return t;
138 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000139 for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000140 if (local == t->parms.iph.saddr &&
141 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
142 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 return t;
144 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000145 t = rcu_dereference(sitn->tunnels_wc[0]);
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000146 if ((t != NULL) && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 return t;
148 return NULL;
149}
150
Eric Dumazet3a43be32010-09-15 11:35:10 +0000151static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700152 struct ip_tunnel_parm *parms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900154 __be32 remote = parms->iph.daddr;
155 __be32 local = parms->iph.saddr;
Eric Dumazet3a43be32010-09-15 11:35:10 +0000156 unsigned int h = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 int prio = 0;
158
159 if (remote) {
160 prio |= 2;
161 h ^= HASH(remote);
162 }
163 if (local) {
164 prio |= 1;
165 h ^= HASH(local);
166 }
Pavel Emelyanov29182172008-04-16 01:16:38 -0700167 return &sitn->tunnels[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168}
169
Eric Dumazet3a43be32010-09-15 11:35:10 +0000170static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700171 struct ip_tunnel *t)
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900172{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700173 return __ipip6_bucket(sitn, &t->parms);
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900174}
175
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700176static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
Eric Dumazet3a43be32010-09-15 11:35:10 +0000178 struct ip_tunnel __rcu **tp;
179 struct ip_tunnel *iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Eric Dumazet3a43be32010-09-15 11:35:10 +0000181 for (tp = ipip6_bucket(sitn, t);
182 (iter = rtnl_dereference(*tp)) != NULL;
183 tp = &iter->next) {
184 if (t == iter) {
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000185 RCU_INIT_POINTER(*tp, t->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 break;
187 }
188 }
189}
190
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700191static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
Eric Dumazet3a43be32010-09-15 11:35:10 +0000193 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000195 RCU_INIT_POINTER(t->next, rtnl_dereference(*tp));
196 RCU_INIT_POINTER(*tp, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
198
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000199static 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 +0000200{
201#ifdef CONFIG_IPV6_SIT_6RD
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000202 struct ip_tunnel *t = netdev_priv(dev);
203
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000204 if (t->dev == sitn->fb_tunnel_dev) {
205 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
206 t->ip6rd.relay_prefix = 0;
207 t->ip6rd.prefixlen = 16;
208 t->ip6rd.relay_prefixlen = 0;
209 } else {
210 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
211 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
212 }
213#endif
214}
215
Eric Dumazet3a43be32010-09-15 11:35:10 +0000216static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700217 struct ip_tunnel_parm *parms, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
Al Viroe69a4ad2006-11-14 20:56:00 -0800219 __be32 remote = parms->iph.daddr;
220 __be32 local = parms->iph.saddr;
Eric Dumazet3a43be32010-09-15 11:35:10 +0000221 struct ip_tunnel *t, *nt;
222 struct ip_tunnel __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 char name[IFNAMSIZ];
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700225 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
Eric Dumazet3a43be32010-09-15 11:35:10 +0000227 for (tp = __ipip6_bucket(sitn, parms);
228 (t = rtnl_dereference(*tp)) != NULL;
229 tp = &t->next) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000230 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000231 remote == t->parms.iph.daddr &&
232 parms->link == t->parms.link) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000233 if (create)
234 return NULL;
235 else
236 return t;
237 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
239 if (!create)
240 goto failed;
241
242 if (parms->name[0])
243 strlcpy(name, parms->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800244 else
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000245 strcpy(name, "sit%d");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
248 if (dev == NULL)
249 return NULL;
250
Pavel Emelyanov7a971462008-04-16 01:17:18 -0700251 dev_net_set(dev, net);
252
Patrick McHardy2941a482006-01-08 22:05:26 -0800253 nt = netdev_priv(dev);
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 nt->parms = *parms;
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000256 if (ipip6_tunnel_init(dev) < 0)
257 goto failed_free;
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000258 ipip6_tunnel_clone_6rd(dev, sitn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100260 if (parms->i_flags & SIT_ISATAP)
261 dev->priv_flags |= IFF_ISATAP;
262
Pavel Emelyanovb37d4282008-02-26 23:51:04 -0800263 if (register_netdevice(dev) < 0)
264 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 dev_hold(dev);
267
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700268 ipip6_tunnel_link(sitn, nt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 return nt;
270
Pavel Emelyanovb37d4282008-02-26 23:51:04 -0800271failed_free:
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000272 ipip6_dev_free(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273failed:
274 return NULL;
275}
276
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000277#define for_each_prl_rcu(start) \
278 for (prl = rcu_dereference(start); \
279 prl; \
280 prl = rcu_dereference(prl->next))
281
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400282static struct ip_tunnel_prl_entry *
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900283__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400284{
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000285 struct ip_tunnel_prl_entry *prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400286
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000287 for_each_prl_rcu(t->prl)
288 if (prl->addr == addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400289 break;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000290 return prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400291
292}
293
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700294static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
295 struct ip_tunnel_prl __user *a)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900296{
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700297 struct ip_tunnel_prl kprl, *kp;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900298 struct ip_tunnel_prl_entry *prl;
299 unsigned int cmax, c = 0, ca, len;
300 int ret = 0;
301
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700302 if (copy_from_user(&kprl, a, sizeof(kprl)))
303 return -EFAULT;
304 cmax = kprl.datalen / sizeof(kprl);
305 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900306 cmax = 1;
307
308 /* For simple GET or for root users,
309 * we try harder to allocate.
310 */
311 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
312 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
313 NULL;
314
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000315 rcu_read_lock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900316
317 ca = t->prl_count < cmax ? t->prl_count : cmax;
318
319 if (!kp) {
320 /* We don't try hard to allocate much memory for
321 * non-root users.
322 * For root users, retry allocating enough memory for
323 * the answer.
324 */
325 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
326 if (!kp) {
327 ret = -ENOMEM;
328 goto out;
329 }
330 }
331
332 c = 0;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000333 for_each_prl_rcu(t->prl) {
Sascha Hlusiak298bf122009-09-29 11:27:05 +0000334 if (c >= cmax)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900335 break;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700336 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900337 continue;
338 kp[c].addr = prl->addr;
339 kp[c].flags = prl->flags;
340 c++;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700341 if (kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900342 break;
343 }
344out:
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000345 rcu_read_unlock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900346
347 len = sizeof(*kp) * c;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700348 ret = 0;
349 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
350 ret = -EFAULT;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900351
352 kfree(kp);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900353
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700354 return ret;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900355}
356
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400357static int
358ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
359{
360 struct ip_tunnel_prl_entry *p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900361 int err = 0;
362
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900363 if (a->addr == htonl(INADDR_ANY))
364 return -EINVAL;
365
Eric Dumazetaac4ddd2010-06-01 00:26:58 -0700366 ASSERT_RTNL();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400367
Eric Dumazet3a43be32010-09-15 11:35:10 +0000368 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900369 if (p->addr == a->addr) {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000370 if (chg) {
371 p->flags = a->flags;
372 goto out;
373 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900374 err = -EEXIST;
375 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400376 }
377 }
378
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900379 if (chg) {
380 err = -ENXIO;
381 goto out;
382 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400383
384 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900385 if (!p) {
386 err = -ENOBUFS;
387 goto out;
388 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400389
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400390 p->next = t->prl;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900391 p->addr = a->addr;
392 p->flags = a->flags;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000393 t->prl_count++;
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000394 RCU_INIT_POINTER(t->prl, p);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900395out:
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900396 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400397}
398
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000399static void prl_list_destroy_rcu(struct rcu_head *head)
400{
401 struct ip_tunnel_prl_entry *p, *n;
402
403 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
404 do {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000405 n = rcu_dereference_protected(p->next, 1);
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000406 kfree(p);
407 p = n;
408 } while (p);
409}
410
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400411static int
412ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
413{
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000414 struct ip_tunnel_prl_entry *x;
415 struct ip_tunnel_prl_entry __rcu **p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900416 int err = 0;
417
Eric Dumazetaac4ddd2010-06-01 00:26:58 -0700418 ASSERT_RTNL();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400419
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900420 if (a && a->addr != htonl(INADDR_ANY)) {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000421 for (p = &t->prl;
422 (x = rtnl_dereference(*p)) != NULL;
423 p = &x->next) {
424 if (x->addr == a->addr) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400425 *p = x->next;
Paul E. McKenney11c476f2011-05-02 00:56:57 -0700426 kfree_rcu(x, rcu_head);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900427 t->prl_count--;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900428 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400429 }
430 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900431 err = -ENXIO;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400432 } else {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000433 x = rtnl_dereference(t->prl);
434 if (x) {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000435 t->prl_count = 0;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000436 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
437 t->prl = NULL;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400438 }
439 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900440out:
Sascha Hlusiak4b27960172009-05-19 12:56:50 +0000441 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400442}
443
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400444static int
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000445isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400446{
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900447 struct ip_tunnel_prl_entry *p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400448 int ok = 1;
449
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000450 rcu_read_lock();
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900451 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400452 if (p) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900453 if (p->flags & PRL_DEFAULT)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400454 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
455 else
456 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
457 } else {
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000458 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
459
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400460 if (ipv6_addr_is_isatap(addr6) &&
461 (addr6->s6_addr32[3] == iph->saddr) &&
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400462 ipv6_chk_prefix(addr6, t->dev))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400463 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
464 else
465 ok = 0;
466 }
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000467 rcu_read_unlock();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400468 return ok;
469}
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471static void ipip6_tunnel_uninit(struct net_device *dev)
472{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700473 struct net *net = dev_net(dev);
474 struct sit_net *sitn = net_generic(net, sit_net_id);
475
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700476 if (dev == sitn->fb_tunnel_dev) {
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000477 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 } else {
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700479 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
YOSHIFUJI Hideaki02e10b92008-04-10 15:41:27 +0900480 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 }
Eric Dumazet3a43be32010-09-15 11:35:10 +0000482 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483}
484
485
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800486static int ipip6_err(struct sk_buff *skb, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
Rami Rosen071f92d2008-05-21 17:47:54 -0700489/* All the routers (except for Linux) return only
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 8 bytes of packet payload. It means, that precise relaying of
491 ICMP in the real Internet is absolutely infeasible.
492 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000493 const struct iphdr *iph = (const struct iphdr *)skb->data;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300494 const int type = icmp_hdr(skb)->type;
495 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 struct ip_tunnel *t;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800497 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
499 switch (type) {
500 default:
501 case ICMP_PARAMETERPROB:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800502 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
504 case ICMP_DEST_UNREACH:
505 switch (code) {
506 case ICMP_SR_FAILED:
507 case ICMP_PORT_UNREACH:
508 /* Impossible event. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800509 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 case ICMP_FRAG_NEEDED:
511 /* Soft state for pmtu is maintained by IP core. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800512 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 default:
514 /* All others are translated to HOST_UNREACH.
515 rfc2003 contains "deep thoughts" about NET_UNREACH,
516 I believe they are just ether pollution. --ANK
517 */
518 break;
519 }
520 break;
521 case ICMP_TIME_EXCEEDED:
522 if (code != ICMP_EXC_TTL)
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800523 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 break;
525 }
526
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800527 err = -ENOENT;
528
Eric Dumazet4543c102009-10-23 17:52:14 +0000529 rcu_read_lock();
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000530 t = ipip6_tunnel_lookup(dev_net(skb->dev),
531 skb->dev,
532 iph->daddr,
533 iph->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 if (t == NULL || t->parms.iph.daddr == 0)
535 goto out;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800536
537 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
539 goto out;
540
Wei Yongjunbb800872009-02-24 23:37:19 -0800541 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 t->err_count++;
543 else
544 t->err_count = 1;
545 t->err_time = jiffies;
546out:
Eric Dumazet4543c102009-10-23 17:52:14 +0000547 rcu_read_unlock();
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800548 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549}
550
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000551static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
553 if (INET_ECN_is_ce(iph->tos))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700554 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555}
556
557static int ipip6_rcv(struct sk_buff *skb)
558{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000559 const struct iphdr *iph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 struct ip_tunnel *tunnel;
561
562 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
563 goto out;
564
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700565 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Eric Dumazet4543c102009-10-23 17:52:14 +0000567 rcu_read_lock();
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000568 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
569 iph->saddr, iph->daddr);
570 if (tunnel != NULL) {
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000571 struct pcpu_tstats *tstats;
572
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700574 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700575 skb_reset_network_header(skb);
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800576 IPCB(skb)->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 skb->protocol = htons(ETH_P_IPV6);
578 skb->pkt_type = PACKET_HOST;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100579
580 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400581 !isatap_chksrc(skb, iph, tunnel)) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700582 tunnel->dev->stats.rx_errors++;
Eric Dumazet4543c102009-10-23 17:52:14 +0000583 rcu_read_unlock();
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100584 kfree_skb(skb);
585 return 0;
586 }
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700587
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000588 tstats = this_cpu_ptr(tunnel->dev->tstats);
589 tstats->rx_packets++;
590 tstats->rx_bytes += skb->len;
591
592 __skb_tunnel_rx(skb, tunnel->dev);
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 ipip6_ecn_decapsulate(iph, skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000595
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000596 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000597
Eric Dumazet4543c102009-10-23 17:52:14 +0000598 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 return 0;
600 }
601
David McCullough6dcdd1b2010-11-29 19:32:34 +0000602 /* no tunnel matched, let upstream know, ipsec may handle it */
Eric Dumazet4543c102009-10-23 17:52:14 +0000603 rcu_read_unlock();
David McCullough6dcdd1b2010-11-29 19:32:34 +0000604 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605out:
David S. Miller36ca34c2008-05-08 23:40:26 -0700606 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 return 0;
608}
609
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000610/*
611 * Returns the embedded IPv4 address if the IPv6 address
612 * comes from 6rd / 6to4 (RFC 3056) addr space.
613 */
614static inline
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000615__be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616{
Al Viroe69a4ad2006-11-14 20:56:00 -0800617 __be32 dst = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000619#ifdef CONFIG_IPV6_SIT_6RD
620 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
621 tunnel->ip6rd.prefixlen)) {
Eric Dumazet3a43be32010-09-15 11:35:10 +0000622 unsigned int pbw0, pbi0;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000623 int pbi1;
624 u32 d;
625
626 pbw0 = tunnel->ip6rd.prefixlen >> 5;
627 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
628
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000629 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000630 tunnel->ip6rd.relay_prefixlen;
631
632 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
633 if (pbi1 > 0)
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000634 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000635 (32 - pbi1);
636
637 dst = tunnel->ip6rd.relay_prefix | htonl(d);
638 }
639#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 if (v6dst->s6_addr16[0] == htons(0x2002)) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900641 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 memcpy(&dst, &v6dst->s6_addr16[1], 4);
643 }
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000644#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 return dst;
646}
647
648/*
649 * This function assumes it is being called from dev_queue_xmit()
650 * and that skb is filled properly by that function.
651 */
652
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000653static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
654 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
Patrick McHardy2941a482006-01-08 22:05:26 -0800656 struct ip_tunnel *tunnel = netdev_priv(dev);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000657 struct pcpu_tstats *tstats;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000658 const struct iphdr *tiph = &tunnel->parms.iph;
659 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 u8 tos = tunnel->parms.iph.tos;
Herbert Xu292f4f32009-11-09 08:42:01 +0000661 __be16 df = tiph->frag_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 struct rtable *rt; /* Route to the other host */
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000663 struct net_device *tdev; /* Device to other host */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 struct iphdr *iph; /* Our new IP header */
Chuck Leverc2636b42007-10-23 21:07:32 -0700665 unsigned int max_headroom; /* The extra header space needed */
Al Viroe69a4ad2006-11-14 20:56:00 -0800666 __be32 dst = tiph->daddr;
David S. Miller31e45432011-05-03 20:25:42 -0700667 struct flowi4 fl4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 int mtu;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000669 const struct in6_addr *addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 int addr_type;
671
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 if (skb->protocol != htons(ETH_P_IPV6))
673 goto tx_error;
674
Lionel Elie Mamanec2bceb32011-08-13 14:04:38 +0000675 if (tos == 1)
676 tos = ipv6_get_dsfield(iph6);
677
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100678 /* ISATAP (RFC4214) - must come before 6to4 */
679 if (dev->priv_flags & IFF_ISATAP) {
680 struct neighbour *neigh = NULL;
681
Eric Dumazetadf30902009-06-02 05:19:30 +0000682 if (skb_dst(skb))
David S. Miller69cce1d2011-07-17 23:09:49 -0700683 neigh = dst_get_neighbour(skb_dst(skb));
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100684
685 if (neigh == NULL) {
686 if (net_ratelimit())
687 printk(KERN_DEBUG "sit: nexthop == NULL\n");
688 goto tx_error;
689 }
690
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000691 addr6 = (const struct in6_addr*)&neigh->primary_key;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100692 addr_type = ipv6_addr_type(addr6);
693
694 if ((addr_type & IPV6_ADDR_UNICAST) &&
695 ipv6_addr_is_isatap(addr6))
696 dst = addr6->s6_addr32[3];
697 else
698 goto tx_error;
699 }
700
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 if (!dst)
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000702 dst = try_6rd(&iph6->daddr, tunnel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
704 if (!dst) {
705 struct neighbour *neigh = NULL;
706
Eric Dumazetadf30902009-06-02 05:19:30 +0000707 if (skb_dst(skb))
David S. Miller69cce1d2011-07-17 23:09:49 -0700708 neigh = dst_get_neighbour(skb_dst(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
710 if (neigh == NULL) {
711 if (net_ratelimit())
712 printk(KERN_DEBUG "sit: nexthop == NULL\n");
713 goto tx_error;
714 }
715
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000716 addr6 = (const struct in6_addr*)&neigh->primary_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 addr_type = ipv6_addr_type(addr6);
718
719 if (addr_type == IPV6_ADDR_ANY) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700720 addr6 = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 addr_type = ipv6_addr_type(addr6);
722 }
723
724 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
725 goto tx_error_icmp;
726
727 dst = addr6->s6_addr32[3];
728 }
729
David S. Miller31e45432011-05-03 20:25:42 -0700730 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500731 dst, tiph->saddr,
732 0, 0,
733 IPPROTO_IPV6, RT_TOS(tos),
734 tunnel->parms.link);
735 if (IS_ERR(rt)) {
736 dev->stats.tx_carrier_errors++;
737 goto tx_error_icmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 }
739 if (rt->rt_type != RTN_UNICAST) {
740 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000741 dev->stats.tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 goto tx_error_icmp;
743 }
Changli Gaod8d1f302010-06-10 23:31:35 -0700744 tdev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
746 if (tdev == dev) {
747 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000748 dev->stats.collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 goto tx_error;
750 }
751
Herbert Xu292f4f32009-11-09 08:42:01 +0000752 if (df) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700753 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
Herbert Xu292f4f32009-11-09 08:42:01 +0000755 if (mtu < 68) {
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000756 dev->stats.collisions++;
Herbert Xu292f4f32009-11-09 08:42:01 +0000757 ip_rt_put(rt);
758 goto tx_error;
759 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Herbert Xu292f4f32009-11-09 08:42:01 +0000761 if (mtu < IPV6_MIN_MTU) {
762 mtu = IPV6_MIN_MTU;
763 df = 0;
764 }
765
766 if (tunnel->parms.iph.daddr && skb_dst(skb))
767 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
768
769 if (skb->len > mtu) {
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000770 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Herbert Xu292f4f32009-11-09 08:42:01 +0000771 ip_rt_put(rt);
772 goto tx_error;
773 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 }
775
776 if (tunnel->err_count > 0) {
Wei Yongjunbb800872009-02-24 23:37:19 -0800777 if (time_before(jiffies,
778 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 tunnel->err_count--;
780 dst_link_failure(skb);
781 } else
782 tunnel->err_count = 0;
783 }
784
785 /*
786 * Okay, now see if we can stuff it in the buffer as-is.
787 */
788 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
789
Patrick McHardycfbba492007-07-09 15:33:40 -0700790 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
791 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
793 if (!new_skb) {
794 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000795 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000797 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 }
799 if (skb->sk)
800 skb_set_owner_w(new_skb, skb->sk);
801 dev_kfree_skb(skb);
802 skb = new_skb;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700803 iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 }
805
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700806 skb->transport_header = skb->network_header;
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700807 skb_push(skb, sizeof(struct iphdr));
808 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800810 IPCB(skb)->flags = 0;
Eric Dumazetadf30902009-06-02 05:19:30 +0000811 skb_dst_drop(skb);
Changli Gaod8d1f302010-06-10 23:31:35 -0700812 skb_dst_set(skb, &rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 /*
815 * Push down and install the IPIP header.
816 */
817
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700818 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 iph->version = 4;
820 iph->ihl = sizeof(struct iphdr)>>2;
Herbert Xu292f4f32009-11-09 08:42:01 +0000821 iph->frag_off = df;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 iph->protocol = IPPROTO_IPV6;
823 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
David S. Miller301102c2011-05-04 12:46:24 -0700824 iph->daddr = fl4.daddr;
825 iph->saddr = fl4.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
827 if ((iph->ttl = tiph->ttl) == 0)
828 iph->ttl = iph6->hop_limit;
829
830 nf_reset(skb);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000831 tstats = this_cpu_ptr(dev->tstats);
832 __IPTUNNEL_XMIT(tstats, &dev->stats);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000833 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
835tx_error_icmp:
836 dst_link_failure(skb);
837tx_error:
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000838 dev->stats.tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000840 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841}
842
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800843static void ipip6_tunnel_bind_dev(struct net_device *dev)
844{
845 struct net_device *tdev = NULL;
846 struct ip_tunnel *tunnel;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000847 const struct iphdr *iph;
David S. Miller31e45432011-05-03 20:25:42 -0700848 struct flowi4 fl4;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800849
850 tunnel = netdev_priv(dev);
851 iph = &tunnel->parms.iph;
852
853 if (iph->daddr) {
David S. Miller31e45432011-05-03 20:25:42 -0700854 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500855 iph->daddr, iph->saddr,
856 0, 0,
857 IPPROTO_IPV6,
858 RT_TOS(iph->tos),
859 tunnel->parms.link);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800860
861 if (!IS_ERR(rt)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700862 tdev = rt->dst.dev;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800863 ip_rt_put(rt);
864 }
865 dev->flags |= IFF_POINTOPOINT;
866 }
867
868 if (!tdev && tunnel->parms.link)
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700869 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800870
871 if (tdev) {
872 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
873 dev->mtu = tdev->mtu - sizeof(struct iphdr);
874 if (dev->mtu < IPV6_MIN_MTU)
875 dev->mtu = IPV6_MIN_MTU;
876 }
877 dev->iflink = tunnel->parms.link;
878}
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880static int
881ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
882{
883 int err = 0;
884 struct ip_tunnel_parm p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400885 struct ip_tunnel_prl prl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 struct ip_tunnel *t;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700887 struct net *net = dev_net(dev);
888 struct sit_net *sitn = net_generic(net, sit_net_id);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000889#ifdef CONFIG_IPV6_SIT_6RD
890 struct ip_tunnel_6rd ip6rd;
891#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
893 switch (cmd) {
894 case SIOCGETTUNNEL:
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000895#ifdef CONFIG_IPV6_SIT_6RD
896 case SIOCGET6RD:
897#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 t = NULL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700899 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
901 err = -EFAULT;
902 break;
903 }
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700904 t = ipip6_tunnel_locate(net, &p, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 }
906 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -0800907 t = netdev_priv(dev);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000908
909 err = -EFAULT;
910 if (cmd == SIOCGETTUNNEL) {
911 memcpy(&p, &t->parms, sizeof(p));
912 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
913 sizeof(p)))
914 goto done;
915#ifdef CONFIG_IPV6_SIT_6RD
916 } else {
917 ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix);
918 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
919 ip6rd.prefixlen = t->ip6rd.prefixlen;
920 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
921 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
922 sizeof(ip6rd)))
923 goto done;
924#endif
925 }
926 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 break;
928
929 case SIOCADDTUNNEL:
930 case SIOCCHGTUNNEL:
931 err = -EPERM;
932 if (!capable(CAP_NET_ADMIN))
933 goto done;
934
935 err = -EFAULT;
936 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
937 goto done;
938
939 err = -EINVAL;
940 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
941 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
942 goto done;
943 if (p.iph.ttl)
944 p.iph.frag_off |= htons(IP_DF);
945
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700946 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700948 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 if (t != NULL) {
950 if (t->dev != dev) {
951 err = -EEXIST;
952 break;
953 }
954 } else {
955 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
956 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
957 err = -EINVAL;
958 break;
959 }
Patrick McHardy2941a482006-01-08 22:05:26 -0800960 t = netdev_priv(dev);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700961 ipip6_tunnel_unlink(sitn, t);
Pavel Emelyanov74b0b852010-10-27 05:43:53 +0000962 synchronize_net();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 t->parms.iph.saddr = p.iph.saddr;
964 t->parms.iph.daddr = p.iph.daddr;
965 memcpy(dev->dev_addr, &p.iph.saddr, 4);
966 memcpy(dev->broadcast, &p.iph.daddr, 4);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700967 ipip6_tunnel_link(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 netdev_state_change(dev);
969 }
970 }
971
972 if (t) {
973 err = 0;
974 if (cmd == SIOCCHGTUNNEL) {
975 t->parms.iph.ttl = p.iph.ttl;
976 t->parms.iph.tos = p.iph.tos;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800977 if (t->parms.link != p.link) {
978 t->parms.link = p.link;
979 ipip6_tunnel_bind_dev(dev);
980 netdev_state_change(dev);
981 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 }
983 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
984 err = -EFAULT;
985 } else
986 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
987 break;
988
989 case SIOCDELTUNNEL:
990 err = -EPERM;
991 if (!capable(CAP_NET_ADMIN))
992 goto done;
993
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700994 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 err = -EFAULT;
996 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
997 goto done;
998 err = -ENOENT;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700999 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 goto done;
1001 err = -EPERM;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001002 if (t == netdev_priv(sitn->fb_tunnel_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 goto done;
1004 dev = t->dev;
1005 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001006 unregister_netdevice(dev);
1007 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 break;
1009
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001010 case SIOCGETPRL:
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001011 err = -EINVAL;
1012 if (dev == sitn->fb_tunnel_dev)
1013 goto done;
1014 err = -ENOENT;
1015 if (!(t = netdev_priv(dev)))
1016 goto done;
1017 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1018 break;
1019
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001020 case SIOCADDPRL:
1021 case SIOCDELPRL:
1022 case SIOCCHGPRL:
1023 err = -EPERM;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001024 if (!capable(CAP_NET_ADMIN))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001025 goto done;
1026 err = -EINVAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001027 if (dev == sitn->fb_tunnel_dev)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001028 goto done;
1029 err = -EFAULT;
1030 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1031 goto done;
1032 err = -ENOENT;
1033 if (!(t = netdev_priv(dev)))
1034 goto done;
1035
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001036 switch (cmd) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001037 case SIOCDELPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001038 err = ipip6_tunnel_del_prl(t, &prl);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001039 break;
1040 case SIOCADDPRL:
1041 case SIOCCHGPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001042 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001043 break;
1044 }
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001045 netdev_state_change(dev);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001046 break;
1047
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001048#ifdef CONFIG_IPV6_SIT_6RD
1049 case SIOCADD6RD:
1050 case SIOCCHG6RD:
1051 case SIOCDEL6RD:
1052 err = -EPERM;
1053 if (!capable(CAP_NET_ADMIN))
1054 goto done;
1055
1056 err = -EFAULT;
1057 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1058 sizeof(ip6rd)))
1059 goto done;
1060
1061 t = netdev_priv(dev);
1062
1063 if (cmd != SIOCDEL6RD) {
1064 struct in6_addr prefix;
1065 __be32 relay_prefix;
1066
1067 err = -EINVAL;
1068 if (ip6rd.relay_prefixlen > 32 ||
1069 ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64)
1070 goto done;
1071
1072 ipv6_addr_prefix(&prefix, &ip6rd.prefix,
1073 ip6rd.prefixlen);
1074 if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
1075 goto done;
YOSHIFUJI Hideaki / 吉藤英明91b2a3f2009-10-11 03:45:13 +00001076 if (ip6rd.relay_prefixlen)
1077 relay_prefix = ip6rd.relay_prefix &
1078 htonl(0xffffffffUL <<
1079 (32 - ip6rd.relay_prefixlen));
1080 else
1081 relay_prefix = 0;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001082 if (relay_prefix != ip6rd.relay_prefix)
1083 goto done;
1084
1085 ipv6_addr_copy(&t->ip6rd.prefix, &prefix);
1086 t->ip6rd.relay_prefix = relay_prefix;
1087 t->ip6rd.prefixlen = ip6rd.prefixlen;
1088 t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen;
1089 } else
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001090 ipip6_tunnel_clone_6rd(dev, sitn);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001091
1092 err = 0;
1093 break;
1094#endif
1095
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 default:
1097 err = -EINVAL;
1098 }
1099
1100done:
1101 return err;
1102}
1103
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1105{
1106 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1107 return -EINVAL;
1108 dev->mtu = new_mtu;
1109 return 0;
1110}
1111
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001112static const struct net_device_ops ipip6_netdev_ops = {
1113 .ndo_uninit = ipip6_tunnel_uninit,
1114 .ndo_start_xmit = ipip6_tunnel_xmit,
1115 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1116 .ndo_change_mtu = ipip6_tunnel_change_mtu,
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001117 .ndo_get_stats = ipip6_get_stats,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001118};
1119
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001120static void ipip6_dev_free(struct net_device *dev)
1121{
1122 free_percpu(dev->tstats);
1123 free_netdev(dev);
1124}
1125
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126static void ipip6_tunnel_setup(struct net_device *dev)
1127{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001128 dev->netdev_ops = &ipip6_netdev_ops;
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001129 dev->destructor = ipip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130
1131 dev->type = ARPHRD_SIT;
1132 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
Kris Katterjohn46f25df2006-01-05 16:35:42 -08001133 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 dev->flags = IFF_NOARP;
Sascha Hlusiakf2ba0252009-07-11 20:30:52 -07001135 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 dev->iflink = 0;
1137 dev->addr_len = 4;
Pavel Emelyanov7a971462008-04-16 01:17:18 -07001138 dev->features |= NETIF_F_NETNS_LOCAL;
Eric Dumazet8df40d12010-09-28 02:53:41 +00001139 dev->features |= NETIF_F_LLTX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140}
1141
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001142static int ipip6_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001144 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145
1146 tunnel->dev = dev;
1147 strcpy(tunnel->parms.name, dev->name);
1148
1149 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1150 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1151
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001152 ipip6_tunnel_bind_dev(dev);
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001153 dev->tstats = alloc_percpu(struct pcpu_tstats);
1154 if (!dev->tstats)
1155 return -ENOMEM;
1156
1157 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158}
1159
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001160static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161{
Patrick McHardy2941a482006-01-08 22:05:26 -08001162 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 struct iphdr *iph = &tunnel->parms.iph;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001164 struct net *net = dev_net(dev);
1165 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
1167 tunnel->dev = dev;
1168 strcpy(tunnel->parms.name, dev->name);
1169
1170 iph->version = 4;
1171 iph->protocol = IPPROTO_IPV6;
1172 iph->ihl = 5;
1173 iph->ttl = 64;
1174
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001175 dev->tstats = alloc_percpu(struct pcpu_tstats);
1176 if (!dev->tstats)
1177 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 dev_hold(dev);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00001179 RCU_INIT_POINTER(sitn->tunnels_wc[0], tunnel);
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001180 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181}
1182
Eric Dumazet6dcd8142010-08-30 07:04:14 +00001183static struct xfrm_tunnel sit_handler __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 .handler = ipip6_rcv,
1185 .err_handler = ipip6_err,
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001186 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187};
1188
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001189static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001190{
1191 int prio;
1192
1193 for (prio = 1; prio < 4; prio++) {
1194 int h;
1195 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001196 struct ip_tunnel *t;
Eric Dumazet62808f92009-10-28 04:37:43 +00001197
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001198 t = rtnl_dereference(sitn->tunnels[prio][h]);
Eric Dumazet62808f92009-10-28 04:37:43 +00001199 while (t != NULL) {
1200 unregister_netdevice_queue(t->dev, head);
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001201 t = rtnl_dereference(t->next);
Eric Dumazet62808f92009-10-28 04:37:43 +00001202 }
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001203 }
1204 }
1205}
1206
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001207static int __net_init sit_init_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001208{
Eric W. Biederman67101172009-11-29 15:46:16 +00001209 struct sit_net *sitn = net_generic(net, sit_net_id);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001210 int err;
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001211
Pavel Emelyanov29182172008-04-16 01:16:38 -07001212 sitn->tunnels[0] = sitn->tunnels_wc;
1213 sitn->tunnels[1] = sitn->tunnels_l;
1214 sitn->tunnels[2] = sitn->tunnels_r;
1215 sitn->tunnels[3] = sitn->tunnels_r_l;
1216
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001217 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1218 ipip6_tunnel_setup);
1219 if (!sitn->fb_tunnel_dev) {
1220 err = -ENOMEM;
1221 goto err_alloc_dev;
1222 }
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001223 dev_net_set(sitn->fb_tunnel_dev, net);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001224
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001225 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1226 if (err)
1227 goto err_dev_free;
1228
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001229 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001230
1231 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1232 goto err_reg_dev;
1233
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001234 return 0;
1235
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001236err_reg_dev:
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001237 dev_put(sitn->fb_tunnel_dev);
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001238err_dev_free:
1239 ipip6_dev_free(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001240err_alloc_dev:
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001241 return err;
1242}
1243
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001244static void __net_exit sit_exit_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001245{
Eric W. Biederman67101172009-11-29 15:46:16 +00001246 struct sit_net *sitn = net_generic(net, sit_net_id);
Eric Dumazet62808f92009-10-28 04:37:43 +00001247 LIST_HEAD(list);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001248
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001249 rtnl_lock();
Eric Dumazet62808f92009-10-28 04:37:43 +00001250 sit_destroy_tunnels(sitn, &list);
1251 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1252 unregister_netdevice_many(&list);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001253 rtnl_unlock();
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001254}
1255
1256static struct pernet_operations sit_net_ops = {
1257 .init = sit_init_net,
1258 .exit = sit_exit_net,
Eric W. Biederman67101172009-11-29 15:46:16 +00001259 .id = &sit_net_id,
1260 .size = sizeof(struct sit_net),
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001261};
1262
Adrian Bunk89c89452006-11-20 16:56:48 -08001263static void __exit sit_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264{
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001265 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001266
Eric W. Biederman67101172009-11-29 15:46:16 +00001267 unregister_pernet_device(&sit_net_ops);
Eric Dumazetef9a9d12009-10-23 17:51:26 +00001268 rcu_barrier(); /* Wait for completion of call_rcu()'s */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269}
1270
Adrian Bunk89c89452006-11-20 16:56:48 -08001271static int __init sit_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272{
1273 int err;
1274
1275 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1276
Eric W. Biederman67101172009-11-29 15:46:16 +00001277 err = register_pernet_device(&sit_net_ops);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001278 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001279 return err;
1280 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1281 if (err < 0) {
1282 unregister_pernet_device(&sit_net_ops);
1283 printk(KERN_INFO "sit init: Can't add protocol\n");
1284 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286}
Joerg Roedel989e5b92006-10-10 14:47:44 -07001287
1288module_init(sit_init);
1289module_exit(sit_cleanup);
Jan Dittmer39c85082006-10-13 15:05:53 -07001290MODULE_LICENSE("GPL");
Vasiliy Kulikov8909c9a2011-03-02 00:33:13 +03001291MODULE_ALIAS_NETDEV("sit0");