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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;
Eric Dumazet8ce120f2011-11-04 23:19:28 +000094} __attribute__((aligned(4*sizeof(unsigned long))));
Eric Dumazet15fc1f72010-09-27 00:38:18 +000095
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) {
Eric Dumazetcf778b02012-01-12 04:41:32 +0000185 rcu_assign_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
Eric Dumazetcf778b02012-01-12 04:41:32 +0000195 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
196 rcu_assign_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
Ted Feng72b36012011-12-08 00:46:21 +0000266 strcpy(nt->parms.name, dev->name);
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 dev_hold(dev);
269
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700270 ipip6_tunnel_link(sitn, nt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 return nt;
272
Pavel Emelyanovb37d4282008-02-26 23:51:04 -0800273failed_free:
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000274 ipip6_dev_free(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275failed:
276 return NULL;
277}
278
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000279#define for_each_prl_rcu(start) \
280 for (prl = rcu_dereference(start); \
281 prl; \
282 prl = rcu_dereference(prl->next))
283
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400284static struct ip_tunnel_prl_entry *
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900285__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400286{
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000287 struct ip_tunnel_prl_entry *prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400288
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000289 for_each_prl_rcu(t->prl)
290 if (prl->addr == addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400291 break;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000292 return prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400293
294}
295
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700296static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
297 struct ip_tunnel_prl __user *a)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900298{
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700299 struct ip_tunnel_prl kprl, *kp;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900300 struct ip_tunnel_prl_entry *prl;
301 unsigned int cmax, c = 0, ca, len;
302 int ret = 0;
303
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700304 if (copy_from_user(&kprl, a, sizeof(kprl)))
305 return -EFAULT;
306 cmax = kprl.datalen / sizeof(kprl);
307 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900308 cmax = 1;
309
310 /* For simple GET or for root users,
311 * we try harder to allocate.
312 */
313 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
314 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
315 NULL;
316
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000317 rcu_read_lock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900318
319 ca = t->prl_count < cmax ? t->prl_count : cmax;
320
321 if (!kp) {
322 /* We don't try hard to allocate much memory for
323 * non-root users.
324 * For root users, retry allocating enough memory for
325 * the answer.
326 */
327 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
328 if (!kp) {
329 ret = -ENOMEM;
330 goto out;
331 }
332 }
333
334 c = 0;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000335 for_each_prl_rcu(t->prl) {
Sascha Hlusiak298bf122009-09-29 11:27:05 +0000336 if (c >= cmax)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900337 break;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700338 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900339 continue;
340 kp[c].addr = prl->addr;
341 kp[c].flags = prl->flags;
342 c++;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700343 if (kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900344 break;
345 }
346out:
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000347 rcu_read_unlock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900348
349 len = sizeof(*kp) * c;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700350 ret = 0;
351 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
352 ret = -EFAULT;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900353
354 kfree(kp);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900355
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700356 return ret;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900357}
358
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400359static int
360ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
361{
362 struct ip_tunnel_prl_entry *p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900363 int err = 0;
364
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900365 if (a->addr == htonl(INADDR_ANY))
366 return -EINVAL;
367
Eric Dumazetaac4ddd2010-06-01 00:26:58 -0700368 ASSERT_RTNL();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400369
Eric Dumazet3a43be32010-09-15 11:35:10 +0000370 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900371 if (p->addr == a->addr) {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000372 if (chg) {
373 p->flags = a->flags;
374 goto out;
375 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900376 err = -EEXIST;
377 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400378 }
379 }
380
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900381 if (chg) {
382 err = -ENXIO;
383 goto out;
384 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400385
386 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900387 if (!p) {
388 err = -ENOBUFS;
389 goto out;
390 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400391
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400392 p->next = t->prl;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900393 p->addr = a->addr;
394 p->flags = a->flags;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000395 t->prl_count++;
Eric Dumazetcf778b02012-01-12 04:41:32 +0000396 rcu_assign_pointer(t->prl, p);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900397out:
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900398 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400399}
400
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000401static void prl_list_destroy_rcu(struct rcu_head *head)
402{
403 struct ip_tunnel_prl_entry *p, *n;
404
405 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
406 do {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000407 n = rcu_dereference_protected(p->next, 1);
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000408 kfree(p);
409 p = n;
410 } while (p);
411}
412
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400413static int
414ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
415{
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000416 struct ip_tunnel_prl_entry *x;
417 struct ip_tunnel_prl_entry __rcu **p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900418 int err = 0;
419
Eric Dumazetaac4ddd2010-06-01 00:26:58 -0700420 ASSERT_RTNL();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400421
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900422 if (a && a->addr != htonl(INADDR_ANY)) {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000423 for (p = &t->prl;
424 (x = rtnl_dereference(*p)) != NULL;
425 p = &x->next) {
426 if (x->addr == a->addr) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400427 *p = x->next;
Paul E. McKenney11c476f2011-05-02 00:56:57 -0700428 kfree_rcu(x, rcu_head);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900429 t->prl_count--;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900430 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400431 }
432 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900433 err = -ENXIO;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400434 } else {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000435 x = rtnl_dereference(t->prl);
436 if (x) {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000437 t->prl_count = 0;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000438 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
439 t->prl = NULL;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400440 }
441 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900442out:
Sascha Hlusiak4b27960172009-05-19 12:56:50 +0000443 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400444}
445
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400446static int
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000447isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400448{
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900449 struct ip_tunnel_prl_entry *p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400450 int ok = 1;
451
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000452 rcu_read_lock();
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900453 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400454 if (p) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900455 if (p->flags & PRL_DEFAULT)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400456 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
457 else
458 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
459 } else {
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000460 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
461
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400462 if (ipv6_addr_is_isatap(addr6) &&
463 (addr6->s6_addr32[3] == iph->saddr) &&
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400464 ipv6_chk_prefix(addr6, t->dev))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400465 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
466 else
467 ok = 0;
468 }
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000469 rcu_read_unlock();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400470 return ok;
471}
472
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473static void ipip6_tunnel_uninit(struct net_device *dev)
474{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700475 struct net *net = dev_net(dev);
476 struct sit_net *sitn = net_generic(net, sit_net_id);
477
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700478 if (dev == sitn->fb_tunnel_dev) {
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000479 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 } else {
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700481 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
YOSHIFUJI Hideaki02e10b92008-04-10 15:41:27 +0900482 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 }
Eric Dumazet3a43be32010-09-15 11:35:10 +0000484 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485}
486
487
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800488static int ipip6_err(struct sk_buff *skb, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Rami Rosen071f92d2008-05-21 17:47:54 -0700491/* All the routers (except for Linux) return only
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 8 bytes of packet payload. It means, that precise relaying of
493 ICMP in the real Internet is absolutely infeasible.
494 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000495 const struct iphdr *iph = (const struct iphdr *)skb->data;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300496 const int type = icmp_hdr(skb)->type;
497 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 struct ip_tunnel *t;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800499 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
501 switch (type) {
502 default:
503 case ICMP_PARAMETERPROB:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800504 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
506 case ICMP_DEST_UNREACH:
507 switch (code) {
508 case ICMP_SR_FAILED:
509 case ICMP_PORT_UNREACH:
510 /* Impossible event. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800511 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 case ICMP_FRAG_NEEDED:
513 /* Soft state for pmtu is maintained by IP core. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800514 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 default:
516 /* All others are translated to HOST_UNREACH.
517 rfc2003 contains "deep thoughts" about NET_UNREACH,
518 I believe they are just ether pollution. --ANK
519 */
520 break;
521 }
522 break;
523 case ICMP_TIME_EXCEEDED:
524 if (code != ICMP_EXC_TTL)
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800525 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 break;
527 }
528
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800529 err = -ENOENT;
530
Eric Dumazet4543c102009-10-23 17:52:14 +0000531 rcu_read_lock();
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000532 t = ipip6_tunnel_lookup(dev_net(skb->dev),
533 skb->dev,
534 iph->daddr,
535 iph->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 if (t == NULL || t->parms.iph.daddr == 0)
537 goto out;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800538
539 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
541 goto out;
542
Wei Yongjunbb800872009-02-24 23:37:19 -0800543 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 t->err_count++;
545 else
546 t->err_count = 1;
547 t->err_time = jiffies;
548out:
Eric Dumazet4543c102009-10-23 17:52:14 +0000549 rcu_read_unlock();
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800550 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551}
552
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000553static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554{
555 if (INET_ECN_is_ce(iph->tos))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700556 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
559static int ipip6_rcv(struct sk_buff *skb)
560{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000561 const struct iphdr *iph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 struct ip_tunnel *tunnel;
563
564 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
565 goto out;
566
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700567 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
Eric Dumazet4543c102009-10-23 17:52:14 +0000569 rcu_read_lock();
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000570 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
571 iph->saddr, iph->daddr);
572 if (tunnel != NULL) {
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000573 struct pcpu_tstats *tstats;
574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700576 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700577 skb_reset_network_header(skb);
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800578 IPCB(skb)->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 skb->protocol = htons(ETH_P_IPV6);
580 skb->pkt_type = PACKET_HOST;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100581
582 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400583 !isatap_chksrc(skb, iph, tunnel)) {
Pavel Emelyanov4eecc102008-05-21 14:15:46 -0700584 tunnel->dev->stats.rx_errors++;
Eric Dumazet4543c102009-10-23 17:52:14 +0000585 rcu_read_unlock();
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100586 kfree_skb(skb);
587 return 0;
588 }
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700589
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000590 tstats = this_cpu_ptr(tunnel->dev->tstats);
591 tstats->rx_packets++;
592 tstats->rx_bytes += skb->len;
593
594 __skb_tunnel_rx(skb, tunnel->dev);
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 ipip6_ecn_decapsulate(iph, skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000597
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000598 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000599
Eric Dumazet4543c102009-10-23 17:52:14 +0000600 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 return 0;
602 }
603
David McCullough6dcdd1b2010-11-29 19:32:34 +0000604 /* no tunnel matched, let upstream know, ipsec may handle it */
Eric Dumazet4543c102009-10-23 17:52:14 +0000605 rcu_read_unlock();
David McCullough6dcdd1b2010-11-29 19:32:34 +0000606 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607out:
David S. Miller36ca34c2008-05-08 23:40:26 -0700608 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 return 0;
610}
611
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000612/*
613 * Returns the embedded IPv4 address if the IPv6 address
614 * comes from 6rd / 6to4 (RFC 3056) addr space.
615 */
616static inline
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000617__be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618{
Al Viroe69a4ad2006-11-14 20:56:00 -0800619 __be32 dst = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000621#ifdef CONFIG_IPV6_SIT_6RD
622 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
623 tunnel->ip6rd.prefixlen)) {
Eric Dumazet3a43be32010-09-15 11:35:10 +0000624 unsigned int pbw0, pbi0;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000625 int pbi1;
626 u32 d;
627
628 pbw0 = tunnel->ip6rd.prefixlen >> 5;
629 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
630
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000631 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000632 tunnel->ip6rd.relay_prefixlen;
633
634 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
635 if (pbi1 > 0)
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000636 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000637 (32 - pbi1);
638
639 dst = tunnel->ip6rd.relay_prefix | htonl(d);
640 }
641#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 if (v6dst->s6_addr16[0] == htons(0x2002)) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900643 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 memcpy(&dst, &v6dst->s6_addr16[1], 4);
645 }
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000646#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 return dst;
648}
649
650/*
651 * This function assumes it is being called from dev_queue_xmit()
652 * and that skb is filled properly by that function.
653 */
654
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000655static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
656 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657{
Patrick McHardy2941a482006-01-08 22:05:26 -0800658 struct ip_tunnel *tunnel = netdev_priv(dev);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000659 struct pcpu_tstats *tstats;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000660 const struct iphdr *tiph = &tunnel->parms.iph;
661 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 u8 tos = tunnel->parms.iph.tos;
Herbert Xu292f4f32009-11-09 08:42:01 +0000663 __be16 df = tiph->frag_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 struct rtable *rt; /* Route to the other host */
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000665 struct net_device *tdev; /* Device to other host */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 struct iphdr *iph; /* Our new IP header */
Chuck Leverc2636b42007-10-23 21:07:32 -0700667 unsigned int max_headroom; /* The extra header space needed */
Al Viroe69a4ad2006-11-14 20:56:00 -0800668 __be32 dst = tiph->daddr;
David S. Miller31e45432011-05-03 20:25:42 -0700669 struct flowi4 fl4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 int mtu;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000671 const struct in6_addr *addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 int addr_type;
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 if (skb->protocol != htons(ETH_P_IPV6))
675 goto tx_error;
676
Lionel Elie Mamanec2bceb32011-08-13 14:04:38 +0000677 if (tos == 1)
678 tos = ipv6_get_dsfield(iph6);
679
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100680 /* ISATAP (RFC4214) - must come before 6to4 */
681 if (dev->priv_flags & IFF_ISATAP) {
682 struct neighbour *neigh = NULL;
David S. Miller1e2927b2012-01-26 15:23:21 -0500683 bool do_tx_error = false;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100684
Eric Dumazetadf30902009-06-02 05:19:30 +0000685 if (skb_dst(skb))
David S. Miller1e2927b2012-01-26 15:23:21 -0500686 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100687
688 if (neigh == NULL) {
689 if (net_ratelimit())
690 printk(KERN_DEBUG "sit: nexthop == NULL\n");
691 goto tx_error;
692 }
693
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000694 addr6 = (const struct in6_addr*)&neigh->primary_key;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100695 addr_type = ipv6_addr_type(addr6);
696
697 if ((addr_type & IPV6_ADDR_UNICAST) &&
698 ipv6_addr_is_isatap(addr6))
699 dst = addr6->s6_addr32[3];
700 else
David S. Miller1e2927b2012-01-26 15:23:21 -0500701 do_tx_error = true;
702
703 neigh_release(neigh);
704 if (do_tx_error)
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100705 goto tx_error;
706 }
707
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 if (!dst)
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000709 dst = try_6rd(&iph6->daddr, tunnel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
711 if (!dst) {
712 struct neighbour *neigh = NULL;
David S. Miller1e2927b2012-01-26 15:23:21 -0500713 bool do_tx_error = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
Eric Dumazetadf30902009-06-02 05:19:30 +0000715 if (skb_dst(skb))
David S. Miller1e2927b2012-01-26 15:23:21 -0500716 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718 if (neigh == NULL) {
719 if (net_ratelimit())
720 printk(KERN_DEBUG "sit: nexthop == NULL\n");
721 goto tx_error;
722 }
723
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000724 addr6 = (const struct in6_addr*)&neigh->primary_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 addr_type = ipv6_addr_type(addr6);
726
727 if (addr_type == IPV6_ADDR_ANY) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700728 addr6 = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 addr_type = ipv6_addr_type(addr6);
730 }
731
David S. Miller1e2927b2012-01-26 15:23:21 -0500732 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
733 dst = addr6->s6_addr32[3];
734 else
735 do_tx_error = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
David S. Miller1e2927b2012-01-26 15:23:21 -0500737 neigh_release(neigh);
738 if (do_tx_error)
739 goto tx_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 }
741
David S. Miller31e45432011-05-03 20:25:42 -0700742 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500743 dst, tiph->saddr,
744 0, 0,
745 IPPROTO_IPV6, RT_TOS(tos),
746 tunnel->parms.link);
747 if (IS_ERR(rt)) {
748 dev->stats.tx_carrier_errors++;
749 goto tx_error_icmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 }
751 if (rt->rt_type != RTN_UNICAST) {
752 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000753 dev->stats.tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 goto tx_error_icmp;
755 }
Changli Gaod8d1f302010-06-10 23:31:35 -0700756 tdev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
758 if (tdev == dev) {
759 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000760 dev->stats.collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 goto tx_error;
762 }
763
Herbert Xu292f4f32009-11-09 08:42:01 +0000764 if (df) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700765 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Herbert Xu292f4f32009-11-09 08:42:01 +0000767 if (mtu < 68) {
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000768 dev->stats.collisions++;
Herbert Xu292f4f32009-11-09 08:42:01 +0000769 ip_rt_put(rt);
770 goto tx_error;
771 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Herbert Xu292f4f32009-11-09 08:42:01 +0000773 if (mtu < IPV6_MIN_MTU) {
774 mtu = IPV6_MIN_MTU;
775 df = 0;
776 }
777
778 if (tunnel->parms.iph.daddr && skb_dst(skb))
779 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
780
781 if (skb->len > mtu) {
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000782 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Herbert Xu292f4f32009-11-09 08:42:01 +0000783 ip_rt_put(rt);
784 goto tx_error;
785 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 }
787
788 if (tunnel->err_count > 0) {
Wei Yongjunbb800872009-02-24 23:37:19 -0800789 if (time_before(jiffies,
790 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 tunnel->err_count--;
792 dst_link_failure(skb);
793 } else
794 tunnel->err_count = 0;
795 }
796
797 /*
798 * Okay, now see if we can stuff it in the buffer as-is.
799 */
800 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
801
Patrick McHardycfbba492007-07-09 15:33:40 -0700802 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
803 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
805 if (!new_skb) {
806 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000807 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000809 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 }
811 if (skb->sk)
812 skb_set_owner_w(new_skb, skb->sk);
813 dev_kfree_skb(skb);
814 skb = new_skb;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700815 iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 }
817
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700818 skb->transport_header = skb->network_header;
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700819 skb_push(skb, sizeof(struct iphdr));
820 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800822 IPCB(skb)->flags = 0;
Eric Dumazetadf30902009-06-02 05:19:30 +0000823 skb_dst_drop(skb);
Changli Gaod8d1f302010-06-10 23:31:35 -0700824 skb_dst_set(skb, &rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
826 /*
827 * Push down and install the IPIP header.
828 */
829
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700830 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 iph->version = 4;
832 iph->ihl = sizeof(struct iphdr)>>2;
Herbert Xu292f4f32009-11-09 08:42:01 +0000833 iph->frag_off = df;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 iph->protocol = IPPROTO_IPV6;
835 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
David S. Miller301102c2011-05-04 12:46:24 -0700836 iph->daddr = fl4.daddr;
837 iph->saddr = fl4.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
839 if ((iph->ttl = tiph->ttl) == 0)
840 iph->ttl = iph6->hop_limit;
841
842 nf_reset(skb);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000843 tstats = this_cpu_ptr(dev->tstats);
844 __IPTUNNEL_XMIT(tstats, &dev->stats);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000845 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
847tx_error_icmp:
848 dst_link_failure(skb);
849tx_error:
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000850 dev->stats.tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000852 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853}
854
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800855static void ipip6_tunnel_bind_dev(struct net_device *dev)
856{
857 struct net_device *tdev = NULL;
858 struct ip_tunnel *tunnel;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000859 const struct iphdr *iph;
David S. Miller31e45432011-05-03 20:25:42 -0700860 struct flowi4 fl4;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800861
862 tunnel = netdev_priv(dev);
863 iph = &tunnel->parms.iph;
864
865 if (iph->daddr) {
David S. Miller31e45432011-05-03 20:25:42 -0700866 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500867 iph->daddr, iph->saddr,
868 0, 0,
869 IPPROTO_IPV6,
870 RT_TOS(iph->tos),
871 tunnel->parms.link);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800872
873 if (!IS_ERR(rt)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700874 tdev = rt->dst.dev;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800875 ip_rt_put(rt);
876 }
877 dev->flags |= IFF_POINTOPOINT;
878 }
879
880 if (!tdev && tunnel->parms.link)
Pavel Emelyanov907a08c2008-04-16 01:16:58 -0700881 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800882
883 if (tdev) {
884 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
885 dev->mtu = tdev->mtu - sizeof(struct iphdr);
886 if (dev->mtu < IPV6_MIN_MTU)
887 dev->mtu = IPV6_MIN_MTU;
888 }
889 dev->iflink = tunnel->parms.link;
890}
891
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892static int
893ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
894{
895 int err = 0;
896 struct ip_tunnel_parm p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400897 struct ip_tunnel_prl prl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 struct ip_tunnel *t;
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700899 struct net *net = dev_net(dev);
900 struct sit_net *sitn = net_generic(net, sit_net_id);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000901#ifdef CONFIG_IPV6_SIT_6RD
902 struct ip_tunnel_6rd ip6rd;
903#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
905 switch (cmd) {
906 case SIOCGETTUNNEL:
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000907#ifdef CONFIG_IPV6_SIT_6RD
908 case SIOCGET6RD:
909#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 t = NULL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700911 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
913 err = -EFAULT;
914 break;
915 }
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700916 t = ipip6_tunnel_locate(net, &p, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 }
918 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -0800919 t = netdev_priv(dev);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000920
921 err = -EFAULT;
922 if (cmd == SIOCGETTUNNEL) {
923 memcpy(&p, &t->parms, sizeof(p));
924 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
925 sizeof(p)))
926 goto done;
927#ifdef CONFIG_IPV6_SIT_6RD
928 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000929 ip6rd.prefix = t->ip6rd.prefix;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000930 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
931 ip6rd.prefixlen = t->ip6rd.prefixlen;
932 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
933 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
934 sizeof(ip6rd)))
935 goto done;
936#endif
937 }
938 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 break;
940
941 case SIOCADDTUNNEL:
942 case SIOCCHGTUNNEL:
943 err = -EPERM;
944 if (!capable(CAP_NET_ADMIN))
945 goto done;
946
947 err = -EFAULT;
948 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
949 goto done;
950
951 err = -EINVAL;
952 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
953 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
954 goto done;
955 if (p.iph.ttl)
956 p.iph.frag_off |= htons(IP_DF);
957
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700958 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700960 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 if (t != NULL) {
962 if (t->dev != dev) {
963 err = -EEXIST;
964 break;
965 }
966 } else {
967 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
968 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
969 err = -EINVAL;
970 break;
971 }
Patrick McHardy2941a482006-01-08 22:05:26 -0800972 t = netdev_priv(dev);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700973 ipip6_tunnel_unlink(sitn, t);
Pavel Emelyanov74b0b852010-10-27 05:43:53 +0000974 synchronize_net();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 t->parms.iph.saddr = p.iph.saddr;
976 t->parms.iph.daddr = p.iph.daddr;
977 memcpy(dev->dev_addr, &p.iph.saddr, 4);
978 memcpy(dev->broadcast, &p.iph.daddr, 4);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700979 ipip6_tunnel_link(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 netdev_state_change(dev);
981 }
982 }
983
984 if (t) {
985 err = 0;
986 if (cmd == SIOCCHGTUNNEL) {
987 t->parms.iph.ttl = p.iph.ttl;
988 t->parms.iph.tos = p.iph.tos;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -0800989 if (t->parms.link != p.link) {
990 t->parms.link = p.link;
991 ipip6_tunnel_bind_dev(dev);
992 netdev_state_change(dev);
993 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 }
995 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
996 err = -EFAULT;
997 } else
998 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
999 break;
1000
1001 case SIOCDELTUNNEL:
1002 err = -EPERM;
1003 if (!capable(CAP_NET_ADMIN))
1004 goto done;
1005
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001006 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 err = -EFAULT;
1008 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1009 goto done;
1010 err = -ENOENT;
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001011 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 goto done;
1013 err = -EPERM;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001014 if (t == netdev_priv(sitn->fb_tunnel_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 goto done;
1016 dev = t->dev;
1017 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001018 unregister_netdevice(dev);
1019 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 break;
1021
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001022 case SIOCGETPRL:
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001023 err = -EINVAL;
1024 if (dev == sitn->fb_tunnel_dev)
1025 goto done;
1026 err = -ENOENT;
1027 if (!(t = netdev_priv(dev)))
1028 goto done;
1029 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1030 break;
1031
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001032 case SIOCADDPRL:
1033 case SIOCDELPRL:
1034 case SIOCCHGPRL:
1035 err = -EPERM;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001036 if (!capable(CAP_NET_ADMIN))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001037 goto done;
1038 err = -EINVAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001039 if (dev == sitn->fb_tunnel_dev)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001040 goto done;
1041 err = -EFAULT;
1042 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1043 goto done;
1044 err = -ENOENT;
1045 if (!(t = netdev_priv(dev)))
1046 goto done;
1047
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001048 switch (cmd) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001049 case SIOCDELPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001050 err = ipip6_tunnel_del_prl(t, &prl);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001051 break;
1052 case SIOCADDPRL:
1053 case SIOCCHGPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001054 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001055 break;
1056 }
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001057 netdev_state_change(dev);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001058 break;
1059
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001060#ifdef CONFIG_IPV6_SIT_6RD
1061 case SIOCADD6RD:
1062 case SIOCCHG6RD:
1063 case SIOCDEL6RD:
1064 err = -EPERM;
1065 if (!capable(CAP_NET_ADMIN))
1066 goto done;
1067
1068 err = -EFAULT;
1069 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1070 sizeof(ip6rd)))
1071 goto done;
1072
1073 t = netdev_priv(dev);
1074
1075 if (cmd != SIOCDEL6RD) {
1076 struct in6_addr prefix;
1077 __be32 relay_prefix;
1078
1079 err = -EINVAL;
1080 if (ip6rd.relay_prefixlen > 32 ||
1081 ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64)
1082 goto done;
1083
1084 ipv6_addr_prefix(&prefix, &ip6rd.prefix,
1085 ip6rd.prefixlen);
1086 if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
1087 goto done;
YOSHIFUJI Hideaki / 吉藤英明91b2a3f2009-10-11 03:45:13 +00001088 if (ip6rd.relay_prefixlen)
1089 relay_prefix = ip6rd.relay_prefix &
1090 htonl(0xffffffffUL <<
1091 (32 - ip6rd.relay_prefixlen));
1092 else
1093 relay_prefix = 0;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001094 if (relay_prefix != ip6rd.relay_prefix)
1095 goto done;
1096
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001097 t->ip6rd.prefix = prefix;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001098 t->ip6rd.relay_prefix = relay_prefix;
1099 t->ip6rd.prefixlen = ip6rd.prefixlen;
1100 t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen;
1101 } else
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001102 ipip6_tunnel_clone_6rd(dev, sitn);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001103
1104 err = 0;
1105 break;
1106#endif
1107
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 default:
1109 err = -EINVAL;
1110 }
1111
1112done:
1113 return err;
1114}
1115
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1117{
1118 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1119 return -EINVAL;
1120 dev->mtu = new_mtu;
1121 return 0;
1122}
1123
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001124static const struct net_device_ops ipip6_netdev_ops = {
1125 .ndo_uninit = ipip6_tunnel_uninit,
1126 .ndo_start_xmit = ipip6_tunnel_xmit,
1127 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1128 .ndo_change_mtu = ipip6_tunnel_change_mtu,
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001129 .ndo_get_stats = ipip6_get_stats,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001130};
1131
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001132static void ipip6_dev_free(struct net_device *dev)
1133{
1134 free_percpu(dev->tstats);
1135 free_netdev(dev);
1136}
1137
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138static void ipip6_tunnel_setup(struct net_device *dev)
1139{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001140 dev->netdev_ops = &ipip6_netdev_ops;
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001141 dev->destructor = ipip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142
1143 dev->type = ARPHRD_SIT;
1144 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
Kris Katterjohn46f25df2006-01-05 16:35:42 -08001145 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 dev->flags = IFF_NOARP;
Sascha Hlusiakf2ba0252009-07-11 20:30:52 -07001147 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 dev->iflink = 0;
1149 dev->addr_len = 4;
Pavel Emelyanov7a971462008-04-16 01:17:18 -07001150 dev->features |= NETIF_F_NETNS_LOCAL;
Eric Dumazet8df40d12010-09-28 02:53:41 +00001151 dev->features |= NETIF_F_LLTX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152}
1153
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001154static int ipip6_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001156 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
1158 tunnel->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159
1160 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1161 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1162
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001163 ipip6_tunnel_bind_dev(dev);
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001164 dev->tstats = alloc_percpu(struct pcpu_tstats);
1165 if (!dev->tstats)
1166 return -ENOMEM;
1167
1168 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169}
1170
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001171static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172{
Patrick McHardy2941a482006-01-08 22:05:26 -08001173 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 struct iphdr *iph = &tunnel->parms.iph;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001175 struct net *net = dev_net(dev);
1176 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177
1178 tunnel->dev = dev;
1179 strcpy(tunnel->parms.name, dev->name);
1180
1181 iph->version = 4;
1182 iph->protocol = IPPROTO_IPV6;
1183 iph->ihl = 5;
1184 iph->ttl = 64;
1185
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001186 dev->tstats = alloc_percpu(struct pcpu_tstats);
1187 if (!dev->tstats)
1188 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 dev_hold(dev);
Eric Dumazetcf778b02012-01-12 04:41:32 +00001190 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001191 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192}
1193
Eric Dumazet6dcd8142010-08-30 07:04:14 +00001194static struct xfrm_tunnel sit_handler __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 .handler = ipip6_rcv,
1196 .err_handler = ipip6_err,
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001197 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198};
1199
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001200static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001201{
1202 int prio;
1203
1204 for (prio = 1; prio < 4; prio++) {
1205 int h;
1206 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001207 struct ip_tunnel *t;
Eric Dumazet62808f92009-10-28 04:37:43 +00001208
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001209 t = rtnl_dereference(sitn->tunnels[prio][h]);
Eric Dumazet62808f92009-10-28 04:37:43 +00001210 while (t != NULL) {
1211 unregister_netdevice_queue(t->dev, head);
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001212 t = rtnl_dereference(t->next);
Eric Dumazet62808f92009-10-28 04:37:43 +00001213 }
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001214 }
1215 }
1216}
1217
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001218static int __net_init sit_init_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001219{
Eric W. Biederman67101172009-11-29 15:46:16 +00001220 struct sit_net *sitn = net_generic(net, sit_net_id);
Ted Feng72b36012011-12-08 00:46:21 +00001221 struct ip_tunnel *t;
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001222 int err;
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001223
Pavel Emelyanov29182172008-04-16 01:16:38 -07001224 sitn->tunnels[0] = sitn->tunnels_wc;
1225 sitn->tunnels[1] = sitn->tunnels_l;
1226 sitn->tunnels[2] = sitn->tunnels_r;
1227 sitn->tunnels[3] = sitn->tunnels_r_l;
1228
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001229 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1230 ipip6_tunnel_setup);
1231 if (!sitn->fb_tunnel_dev) {
1232 err = -ENOMEM;
1233 goto err_alloc_dev;
1234 }
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001235 dev_net_set(sitn->fb_tunnel_dev, net);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001236
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001237 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1238 if (err)
1239 goto err_dev_free;
1240
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001241 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001242
1243 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1244 goto err_reg_dev;
1245
Ted Feng72b36012011-12-08 00:46:21 +00001246 t = netdev_priv(sitn->fb_tunnel_dev);
1247
1248 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001249 return 0;
1250
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001251err_reg_dev:
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001252 dev_put(sitn->fb_tunnel_dev);
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001253err_dev_free:
1254 ipip6_dev_free(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001255err_alloc_dev:
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001256 return err;
1257}
1258
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001259static void __net_exit sit_exit_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001260{
Eric W. Biederman67101172009-11-29 15:46:16 +00001261 struct sit_net *sitn = net_generic(net, sit_net_id);
Eric Dumazet62808f92009-10-28 04:37:43 +00001262 LIST_HEAD(list);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001263
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001264 rtnl_lock();
Eric Dumazet62808f92009-10-28 04:37:43 +00001265 sit_destroy_tunnels(sitn, &list);
1266 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1267 unregister_netdevice_many(&list);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001268 rtnl_unlock();
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001269}
1270
1271static struct pernet_operations sit_net_ops = {
1272 .init = sit_init_net,
1273 .exit = sit_exit_net,
Eric W. Biederman67101172009-11-29 15:46:16 +00001274 .id = &sit_net_id,
1275 .size = sizeof(struct sit_net),
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001276};
1277
Adrian Bunk89c89452006-11-20 16:56:48 -08001278static void __exit sit_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279{
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001280 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001281
Eric W. Biederman67101172009-11-29 15:46:16 +00001282 unregister_pernet_device(&sit_net_ops);
Eric Dumazetef9a9d12009-10-23 17:51:26 +00001283 rcu_barrier(); /* Wait for completion of call_rcu()'s */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284}
1285
Adrian Bunk89c89452006-11-20 16:56:48 -08001286static int __init sit_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287{
1288 int err;
1289
1290 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1291
Eric W. Biederman67101172009-11-29 15:46:16 +00001292 err = register_pernet_device(&sit_net_ops);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001293 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001294 return err;
1295 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1296 if (err < 0) {
1297 unregister_pernet_device(&sit_net_ops);
1298 printk(KERN_INFO "sit init: Can't add protocol\n");
1299 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301}
Joerg Roedel989e5b92006-10-10 14:47:44 -07001302
1303module_init(sit_init);
1304module_exit(sit_cleanup);
Jan Dittmer39c85082006-10-13 15:05:53 -07001305MODULE_LICENSE("GPL");
Vasiliy Kulikov8909c9a2011-03-02 00:33:13 +03001306MODULE_ALIAS_NETDEV("sit0");