blob: 94428fd85b2f9543c0e3015f785306ce203e73dc [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
3 * Linux INET6 implementation
4 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Changes:
15 * Roger Venning <r.venning@telstra.com>: 6to4 support
16 * Nate Thompson <nate@thebog.net>: 6to4 support
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -040017 * Fred Templin <fred.l.templin@boeing.com>: isatap support
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
Joe Perchesf3213832012-05-15 14:11:53 +000020#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/module.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080023#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/net.h>
29#include <linux/in6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/icmp.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/uaccess.h>
35#include <linux/init.h>
36#include <linux/netfilter_ipv4.h>
Kris Katterjohn46f25df2006-01-05 16:35:42 -080037#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <net/sock.h>
40#include <net/snmp.h>
41
42#include <net/ipv6.h>
43#include <net/protocol.h>
44#include <net/transp_v6.h>
45#include <net/ip6_fib.h>
46#include <net/ip6_route.h>
47#include <net/ndisc.h>
48#include <net/addrconf.h>
49#include <net/ip.h>
50#include <net/udp.h>
51#include <net/icmp.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000052#include <net/ip_tunnels.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <net/inet_ecn.h>
54#include <net/xfrm.h>
55#include <net/dsfield.h>
Pavel Emelyanov8190d902008-04-16 01:15:17 -070056#include <net/net_namespace.h>
57#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59/*
60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
61
62 For comments look at net/ipv4/ip_gre.c --ANK
63 */
64
65#define HASH_SIZE 16
Al Viroe69a4adc2006-11-14 20:56:00 -080066#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +000068static bool log_ecn_error = true;
69module_param(log_ecn_error, bool, 0644);
70MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
71
Eric Dumazet15fc1f72010-09-27 00:38:18 +000072static int ipip6_tunnel_init(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073static void ipip6_tunnel_setup(struct net_device *dev);
Eric Dumazet15fc1f72010-09-27 00:38:18 +000074static void ipip6_dev_free(struct net_device *dev);
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +000075static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
76 __be32 *v4dst);
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +000077static struct rtnl_link_ops sit_link_ops __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Eric Dumazetf99189b2009-11-17 10:42:49 +000079static int sit_net_id __read_mostly;
Pavel Emelyanov8190d902008-04-16 01:15:17 -070080struct sit_net {
Eric Dumazet3a43be32010-09-15 11:35:10 +000081 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
82 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
83 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
84 struct ip_tunnel __rcu *tunnels_wc[1];
85 struct ip_tunnel __rcu **tunnels[4];
Pavel Emelyanov29182172008-04-16 01:16:38 -070086
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -070087 struct net_device *fb_tunnel_dev;
Pavel Emelyanov8190d902008-04-16 01:15:17 -070088};
89
Eric Dumazet4543c102009-10-23 17:52:14 +000090/*
91 * Must be invoked with rcu_read_lock
92 */
Eldad Zack3e866702012-04-01 07:49:01 +000093static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +000094 struct net_device *dev, __be32 remote, __be32 local)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
Eric Dumazet3a43be32010-09-15 11:35:10 +000096 unsigned int h0 = HASH(remote);
97 unsigned int h1 = HASH(local);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 struct ip_tunnel *t;
Pavel Emelyanov29182172008-04-16 01:16:38 -070099 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Amerigo Wange086cad2012-11-11 21:52:34 +0000101 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000103 remote == t->parms.iph.daddr &&
Shmulik Ladkanibc8fc7b2014-08-14 15:27:20 +0300104 (!dev || !t->parms.link || dev->ifindex == t->parms.link) &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000105 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 return t;
107 }
Amerigo Wange086cad2012-11-11 21:52:34 +0000108 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000109 if (remote == t->parms.iph.daddr &&
Shmulik Ladkanibc8fc7b2014-08-14 15:27:20 +0300110 (!dev || !t->parms.link || dev->ifindex == t->parms.link) &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000111 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return t;
113 }
Amerigo Wange086cad2012-11-11 21:52:34 +0000114 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000115 if (local == t->parms.iph.saddr &&
Shmulik Ladkanibc8fc7b2014-08-14 15:27:20 +0300116 (!dev || !t->parms.link || dev->ifindex == t->parms.link) &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000117 (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 return t;
119 }
Eric Dumazet4543c102009-10-23 17:52:14 +0000120 t = rcu_dereference(sitn->tunnels_wc[0]);
Ian Morris53b24b82015-03-29 14:00:05 +0100121 if (t && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 return t;
123 return NULL;
124}
125
Eric Dumazet3a43be32010-09-15 11:35:10 +0000126static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700127 struct ip_tunnel_parm *parms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900129 __be32 remote = parms->iph.daddr;
130 __be32 local = parms->iph.saddr;
Eric Dumazet3a43be32010-09-15 11:35:10 +0000131 unsigned int h = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 int prio = 0;
133
134 if (remote) {
135 prio |= 2;
136 h ^= HASH(remote);
137 }
138 if (local) {
139 prio |= 1;
140 h ^= HASH(local);
141 }
Pavel Emelyanov29182172008-04-16 01:16:38 -0700142 return &sitn->tunnels[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143}
144
Eric Dumazet3a43be32010-09-15 11:35:10 +0000145static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700146 struct ip_tunnel *t)
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900147{
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700148 return __ipip6_bucket(sitn, &t->parms);
YOSHIFUJI Hideaki420fe232007-04-24 20:44:47 +0900149}
150
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700151static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
Eric Dumazet3a43be32010-09-15 11:35:10 +0000153 struct ip_tunnel __rcu **tp;
154 struct ip_tunnel *iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Eric Dumazet3a43be32010-09-15 11:35:10 +0000156 for (tp = ipip6_bucket(sitn, t);
157 (iter = rtnl_dereference(*tp)) != NULL;
158 tp = &iter->next) {
159 if (t == iter) {
Eric Dumazetcf778b02012-01-12 04:41:32 +0000160 rcu_assign_pointer(*tp, t->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 break;
162 }
163 }
164}
165
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700166static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167{
Eric Dumazet3a43be32010-09-15 11:35:10 +0000168 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Eric Dumazetcf778b02012-01-12 04:41:32 +0000170 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
171 rcu_assign_pointer(*tp, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000174static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000175{
176#ifdef CONFIG_IPV6_SIT_6RD
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +0000177 struct ip_tunnel *t = netdev_priv(dev);
178
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000179 if (t->dev == sitn->fb_tunnel_dev) {
180 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
181 t->ip6rd.relay_prefix = 0;
182 t->ip6rd.prefixlen = 16;
183 t->ip6rd.relay_prefixlen = 0;
184 } else {
185 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
186 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
187 }
188#endif
189}
190
Nicolas Dichtelf3723412012-11-14 05:14:07 +0000191static int ipip6_tunnel_create(struct net_device *dev)
192{
193 struct ip_tunnel *t = netdev_priv(dev);
194 struct net *net = dev_net(dev);
195 struct sit_net *sitn = net_generic(net, sit_net_id);
196 int err;
197
Steffen Klassertebe084a2014-11-03 09:19:29 +0100198 memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
199 memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
Nicolas Dichtelf3723412012-11-14 05:14:07 +0000200
Nicolas Dichteld440b722012-11-15 04:06:41 +0000201 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
Nicolas Dichtelf3723412012-11-14 05:14:07 +0000202 dev->priv_flags |= IFF_ISATAP;
203
204 err = register_netdevice(dev);
205 if (err < 0)
206 goto out;
207
Steffen Klassertebe084a2014-11-03 09:19:29 +0100208 ipip6_tunnel_clone_6rd(dev, sitn);
209
Nicolas Dichtelf3723412012-11-14 05:14:07 +0000210 dev->rtnl_link_ops = &sit_link_ops;
211
212 dev_hold(dev);
213
214 ipip6_tunnel_link(sitn, t);
215 return 0;
216
217out:
218 return err;
219}
220
Eric Dumazet3a43be32010-09-15 11:35:10 +0000221static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700222 struct ip_tunnel_parm *parms, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
Al Viroe69a4adc2006-11-14 20:56:00 -0800224 __be32 remote = parms->iph.daddr;
225 __be32 local = parms->iph.saddr;
Eric Dumazet3a43be32010-09-15 11:35:10 +0000226 struct ip_tunnel *t, *nt;
227 struct ip_tunnel __rcu **tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 char name[IFNAMSIZ];
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700230 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Eric Dumazet3a43be32010-09-15 11:35:10 +0000232 for (tp = __ipip6_bucket(sitn, parms);
233 (t = rtnl_dereference(*tp)) != NULL;
234 tp = &t->next) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000235 if (local == t->parms.iph.saddr &&
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000236 remote == t->parms.iph.daddr &&
237 parms->link == t->parms.link) {
Sascha Hlusiak8db99e52009-05-19 12:56:48 +0000238 if (create)
239 return NULL;
240 else
241 return t;
242 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 }
244 if (!create)
245 goto failed;
246
247 if (parms->name[0])
248 strlcpy(name, parms->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800249 else
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000250 strcpy(name, "sit%d");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Tom Gundersenc835a672014-07-14 16:37:24 +0200252 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
253 ipip6_tunnel_setup);
Ian Morris63159f22015-03-29 14:00:04 +0100254 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 return NULL;
256
Pavel Emelyanov7a971462008-04-16 01:17:18 -0700257 dev_net_set(dev, net);
258
Patrick McHardy2941a482006-01-08 22:05:26 -0800259 nt = netdev_priv(dev);
Stephen Hemminger1326c3d2008-11-20 20:33:56 -0800260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 nt->parms = *parms;
Nicolas Dichtelf3723412012-11-14 05:14:07 +0000262 if (ipip6_tunnel_create(dev) < 0)
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800263 goto failed_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 return nt;
266
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800267failed_free:
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000268 ipip6_dev_free(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269failed:
270 return NULL;
271}
272
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000273#define for_each_prl_rcu(start) \
274 for (prl = rcu_dereference(start); \
275 prl; \
276 prl = rcu_dereference(prl->next))
277
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400278static struct ip_tunnel_prl_entry *
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900279__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400280{
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000281 struct ip_tunnel_prl_entry *prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400282
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000283 for_each_prl_rcu(t->prl)
284 if (prl->addr == addr)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400285 break;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000286 return prl;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400287
288}
289
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700290static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
291 struct ip_tunnel_prl __user *a)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900292{
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700293 struct ip_tunnel_prl kprl, *kp;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900294 struct ip_tunnel_prl_entry *prl;
295 unsigned int cmax, c = 0, ca, len;
296 int ret = 0;
297
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700298 if (copy_from_user(&kprl, a, sizeof(kprl)))
299 return -EFAULT;
300 cmax = kprl.datalen / sizeof(kprl);
301 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900302 cmax = 1;
303
304 /* For simple GET or for root users,
305 * we try harder to allocate.
306 */
307 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
308 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
309 NULL;
310
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000311 rcu_read_lock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900312
313 ca = t->prl_count < cmax ? t->prl_count : cmax;
314
315 if (!kp) {
316 /* We don't try hard to allocate much memory for
317 * non-root users.
318 * For root users, retry allocating enough memory for
319 * the answer.
320 */
321 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
322 if (!kp) {
323 ret = -ENOMEM;
324 goto out;
325 }
326 }
327
328 c = 0;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000329 for_each_prl_rcu(t->prl) {
Sascha Hlusiak298bf122009-09-29 11:27:05 +0000330 if (c >= cmax)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900331 break;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700332 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900333 continue;
334 kp[c].addr = prl->addr;
335 kp[c].flags = prl->flags;
336 c++;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700337 if (kprl.addr != htonl(INADDR_ANY))
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900338 break;
339 }
340out:
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000341 rcu_read_unlock();
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900342
343 len = sizeof(*kp) * c;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700344 ret = 0;
345 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
346 ret = -EFAULT;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900347
348 kfree(kp);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900349
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -0700350 return ret;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900351}
352
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400353static int
354ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
355{
356 struct ip_tunnel_prl_entry *p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900357 int err = 0;
358
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900359 if (a->addr == htonl(INADDR_ANY))
360 return -EINVAL;
361
Eric Dumazetaac4ddd2010-06-01 00:26:58 -0700362 ASSERT_RTNL();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400363
Eric Dumazet3a43be32010-09-15 11:35:10 +0000364 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900365 if (p->addr == a->addr) {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000366 if (chg) {
367 p->flags = a->flags;
368 goto out;
369 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900370 err = -EEXIST;
371 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400372 }
373 }
374
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900375 if (chg) {
376 err = -ENXIO;
377 goto out;
378 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400379
380 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900381 if (!p) {
382 err = -ENOBUFS;
383 goto out;
384 }
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400385
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400386 p->next = t->prl;
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900387 p->addr = a->addr;
388 p->flags = a->flags;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000389 t->prl_count++;
Eric Dumazetcf778b02012-01-12 04:41:32 +0000390 rcu_assign_pointer(t->prl, p);
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900391out:
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900392 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400393}
394
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000395static void prl_list_destroy_rcu(struct rcu_head *head)
396{
397 struct ip_tunnel_prl_entry *p, *n;
398
399 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
400 do {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000401 n = rcu_dereference_protected(p->next, 1);
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000402 kfree(p);
403 p = n;
404 } while (p);
405}
406
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400407static int
408ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
409{
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000410 struct ip_tunnel_prl_entry *x;
411 struct ip_tunnel_prl_entry __rcu **p;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900412 int err = 0;
413
Eric Dumazetaac4ddd2010-06-01 00:26:58 -0700414 ASSERT_RTNL();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400415
YOSHIFUJI Hideaki0009ae12008-03-22 17:50:59 +0900416 if (a && a->addr != htonl(INADDR_ANY)) {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000417 for (p = &t->prl;
418 (x = rtnl_dereference(*p)) != NULL;
419 p = &x->next) {
420 if (x->addr == a->addr) {
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400421 *p = x->next;
Paul E. McKenney11c476f2011-05-02 00:56:57 -0700422 kfree_rcu(x, rcu_head);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900423 t->prl_count--;
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900424 goto out;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400425 }
426 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900427 err = -ENXIO;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400428 } else {
Eric Dumazet753ea8e2011-01-20 07:16:24 +0000429 x = rtnl_dereference(t->prl);
430 if (x) {
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000431 t->prl_count = 0;
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000432 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
433 t->prl = NULL;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400434 }
435 }
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900436out:
Sascha Hlusiak4b27960172009-05-19 12:56:50 +0000437 return err;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400438}
439
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400440static int
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000441isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400442{
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900443 struct ip_tunnel_prl_entry *p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400444 int ok = 1;
445
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000446 rcu_read_lock();
YOSHIFUJI Hideaki3fcfa122008-03-22 17:42:57 +0900447 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400448 if (p) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +0900449 if (p->flags & PRL_DEFAULT)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400450 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
451 else
452 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
453 } else {
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000454 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
455
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400456 if (ipv6_addr_is_isatap(addr6) &&
457 (addr6->s6_addr32[3] == iph->saddr) &&
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400458 ipv6_chk_prefix(addr6, t->dev))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400459 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
460 else
461 ok = 0;
462 }
Eric Dumazetef9a9d12009-10-23 17:51:26 +0000463 rcu_read_unlock();
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -0400464 return ok;
465}
466
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467static void ipip6_tunnel_uninit(struct net_device *dev)
468{
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +0200469 struct ip_tunnel *tunnel = netdev_priv(dev);
470 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
Pavel Emelyanovca8def12008-04-16 01:15:39 -0700471
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -0700472 if (dev == sitn->fb_tunnel_dev) {
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000473 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 } else {
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +0200475 ipip6_tunnel_unlink(sitn, tunnel);
476 ipip6_tunnel_del_prl(tunnel, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 }
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +0100478 ip_tunnel_dst_reset_all(tunnel);
Eric Dumazet3a43be32010-09-15 11:35:10 +0000479 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480}
481
Oussama Ghorbelca15a072013-11-22 16:23:20 +0100482/* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
483 * if sufficient data bytes are available
484 */
485static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb)
486{
Li RongQinga6d45182014-10-18 17:33:38 +0800487 int ihl = ((const struct iphdr *)skb->data)->ihl*4;
Oussama Ghorbelca15a072013-11-22 16:23:20 +0100488 struct rt6_info *rt;
489 struct sk_buff *skb2;
490
Li RongQinga6d45182014-10-18 17:33:38 +0800491 if (!pskb_may_pull(skb, ihl + sizeof(struct ipv6hdr) + 8))
Oussama Ghorbelca15a072013-11-22 16:23:20 +0100492 return 1;
493
494 skb2 = skb_clone(skb, GFP_ATOMIC);
495
496 if (!skb2)
497 return 1;
498
499 skb_dst_drop(skb2);
Li RongQinga6d45182014-10-18 17:33:38 +0800500 skb_pull(skb2, ihl);
Oussama Ghorbelca15a072013-11-22 16:23:20 +0100501 skb_reset_network_header(skb2);
502
503 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0);
504
505 if (rt && rt->dst.dev)
506 skb2->dev = rt->dst.dev;
507
508 icmpv6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
509
510 if (rt)
511 ip6_rt_put(rt);
512
513 kfree_skb(skb2);
514
515 return 0;
516}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800518static int ipip6_err(struct sk_buff *skb, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000520 const struct iphdr *iph = (const struct iphdr *)skb->data;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300521 const int type = icmp_hdr(skb)->type;
522 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 struct ip_tunnel *t;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800524 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 switch (type) {
527 default:
528 case ICMP_PARAMETERPROB:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800529 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 case ICMP_DEST_UNREACH:
532 switch (code) {
533 case ICMP_SR_FAILED:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 /* Impossible event. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800535 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 default:
537 /* All others are translated to HOST_UNREACH.
538 rfc2003 contains "deep thoughts" about NET_UNREACH,
539 I believe they are just ether pollution. --ANK
540 */
541 break;
542 }
543 break;
544 case ICMP_TIME_EXCEEDED:
545 if (code != ICMP_EXC_TTL)
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800546 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700548 case ICMP_REDIRECT:
549 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 }
551
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800552 err = -ENOENT;
553
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000554 t = ipip6_tunnel_lookup(dev_net(skb->dev),
555 skb->dev,
556 iph->daddr,
557 iph->saddr);
Ian Morris63159f22015-03-29 14:00:04 +0100558 if (!t)
David S. Miller36393392012-06-14 22:21:46 -0700559 goto out;
560
561 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
562 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
Dmitry Popov23468292014-06-06 23:19:21 +0400563 t->parms.link, 0, IPPROTO_IPV6, 0);
David S. Miller36393392012-06-14 22:21:46 -0700564 err = 0;
565 goto out;
566 }
David S. Millerec18d9a2012-07-12 00:25:15 -0700567 if (type == ICMP_REDIRECT) {
Dmitry Popov23468292014-06-06 23:19:21 +0400568 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
David S. Millerec18d9a2012-07-12 00:25:15 -0700569 IPPROTO_IPV6, 0);
570 err = 0;
571 goto out;
572 }
David S. Miller36393392012-06-14 22:21:46 -0700573
574 if (t->parms.iph.daddr == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 goto out;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800576
577 err = 0;
Oussama Ghorbelca15a072013-11-22 16:23:20 +0100578 if (!ipip6_err_gen_icmpv6_unreach(skb))
579 goto out;
580
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
582 goto out;
583
Wei Yongjunbb800872009-02-24 23:37:19 -0800584 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 t->err_count++;
586 else
587 t->err_count = 1;
588 t->err_time = jiffies;
589out:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800590 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591}
592
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000593static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
594 const struct in6_addr *v6addr)
595{
596 __be32 v4embed = 0;
597 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
598 return true;
599 return false;
600}
601
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300602/* Checks if an address matches an address on the tunnel interface.
603 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
604 * Long story:
605 * This function is called after we considered the packet as spoofed
606 * in is_spoofed_6rd.
607 * We may have a router that is doing NAT for proto 41 packets
608 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
609 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
610 * function will return true, dropping the packet.
611 * But, we can still check if is spoofed against the IP
612 * addresses associated with the interface.
613 */
614static bool only_dnatted(const struct ip_tunnel *tunnel,
615 const struct in6_addr *v6dst)
616{
617 int prefix_len;
618
619#ifdef CONFIG_IPV6_SIT_6RD
620 prefix_len = tunnel->ip6rd.prefixlen + 32
621 - tunnel->ip6rd.relay_prefixlen;
622#else
623 prefix_len = 48;
624#endif
625 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
626}
627
628/* Returns true if a packet is spoofed */
629static bool packet_is_spoofed(struct sk_buff *skb,
630 const struct iphdr *iph,
631 struct ip_tunnel *tunnel)
632{
633 const struct ipv6hdr *ipv6h;
634
635 if (tunnel->dev->priv_flags & IFF_ISATAP) {
636 if (!isatap_chksrc(skb, iph, tunnel))
637 return true;
638
639 return false;
640 }
641
642 if (tunnel->dev->flags & IFF_POINTOPOINT)
643 return false;
644
645 ipv6h = ipv6_hdr(skb);
646
647 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
648 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
649 &iph->saddr, &ipv6h->saddr,
650 &iph->daddr, &ipv6h->daddr);
651 return true;
652 }
653
654 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
655 return false;
656
657 if (only_dnatted(tunnel, &ipv6h->daddr))
658 return false;
659
660 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
661 &iph->saddr, &ipv6h->saddr,
662 &iph->daddr, &ipv6h->daddr);
663 return true;
664}
665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666static int ipip6_rcv(struct sk_buff *skb)
667{
Hannes Frederic Sowa1ad759d2013-01-18 09:18:17 +0000668 const struct iphdr *iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 struct ip_tunnel *tunnel;
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000670 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000672 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
673 iph->saddr, iph->daddr);
Ian Morris53b24b82015-03-29 14:00:05 +0100674 if (tunnel) {
Li RongQing8f849852014-01-04 13:57:59 +0800675 struct pcpu_sw_netstats *tstats;
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000676
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000677 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
678 tunnel->parms.iph.protocol != 0)
679 goto out;
680
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700681 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700682 skb_reset_network_header(skb);
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800683 IPCB(skb)->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 skb->protocol = htons(ETH_P_IPV6);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100685
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300686 if (packet_is_spoofed(skb, iph, tunnel)) {
687 tunnel->dev->stats.rx_errors++;
688 goto out;
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000689 }
690
Nicolas Dichtelea231922013-09-02 15:34:58 +0200691 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000692
693 err = IP_ECN_decapsulate(iph, skb);
694 if (unlikely(err)) {
695 if (log_ecn_error)
696 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
697 &iph->saddr, iph->tos);
698 if (err > 1) {
699 ++tunnel->dev->stats.rx_frame_errors;
700 ++tunnel->dev->stats.rx_errors;
701 goto out;
702 }
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100703 }
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700704
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000705 tstats = this_cpu_ptr(tunnel->dev->tstats);
Li RongQingc3ac17c2014-01-02 08:49:36 +0800706 u64_stats_update_begin(&tstats->syncp);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000707 tstats->rx_packets++;
708 tstats->rx_bytes += skb->len;
Li RongQingc3ac17c2014-01-02 08:49:36 +0800709 u64_stats_update_end(&tstats->syncp);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000710
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000711 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 return 0;
714 }
715
David McCullough6dcdd1b2010-11-29 19:32:34 +0000716 /* no tunnel matched, let upstream know, ipsec may handle it */
David McCullough6dcdd1b2010-11-29 19:32:34 +0000717 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718out:
David S. Miller36ca34c2008-05-08 23:40:26 -0700719 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 return 0;
721}
722
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000723static const struct tnl_ptk_info tpi = {
724 /* no tunnel info required for ipip. */
725 .proto = htons(ETH_P_IP),
726};
727
728static int ipip_rcv(struct sk_buff *skb)
729{
Pravin B Shelar3d7b46c2013-06-17 17:50:02 -0700730 const struct iphdr *iph;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000731 struct ip_tunnel *tunnel;
732
Pravin B Shelar3d7b46c2013-06-17 17:50:02 -0700733 iph = ip_hdr(skb);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000734 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
735 iph->saddr, iph->daddr);
Ian Morris53b24b82015-03-29 14:00:05 +0100736 if (tunnel) {
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000737 if (tunnel->parms.iph.protocol != IPPROTO_IPIP &&
738 tunnel->parms.iph.protocol != 0)
739 goto drop;
740
741 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
742 goto drop;
Li Hongjun737e8282013-08-28 11:54:50 +0200743 if (iptunnel_pull_header(skb, 0, tpi.proto))
744 goto drop;
Pravin B Shelar2e15ea32015-08-07 23:51:42 -0700745 return ip_tunnel_rcv(tunnel, skb, &tpi, NULL, log_ecn_error);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000746 }
747
748 return 1;
749
750drop:
751 kfree_skb(skb);
752 return 0;
753}
754
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000755/*
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000756 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
757 * stores the embedded IPv4 address in v4dst and returns true.
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000758 */
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000759static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
760 __be32 *v4dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000762#ifdef CONFIG_IPV6_SIT_6RD
763 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
764 tunnel->ip6rd.prefixlen)) {
Eric Dumazet3a43be32010-09-15 11:35:10 +0000765 unsigned int pbw0, pbi0;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000766 int pbi1;
767 u32 d;
768
769 pbw0 = tunnel->ip6rd.prefixlen >> 5;
770 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
771
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000772 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000773 tunnel->ip6rd.relay_prefixlen;
774
775 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
776 if (pbi1 > 0)
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000777 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000778 (32 - pbi1);
779
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000780 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
781 return true;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000782 }
783#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 if (v6dst->s6_addr16[0] == htons(0x2002)) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900785 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000786 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
787 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 }
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000789#endif
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000790 return false;
791}
792
793static inline __be32 try_6rd(struct ip_tunnel *tunnel,
794 const struct in6_addr *v6dst)
795{
796 __be32 dst = 0;
797 check_6rd(tunnel, v6dst, &dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 return dst;
799}
800
801/*
802 * This function assumes it is being called from dev_queue_xmit()
803 * and that skb is filled properly by that function.
804 */
805
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000806static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
807 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808{
Patrick McHardy2941a482006-01-08 22:05:26 -0800809 struct ip_tunnel *tunnel = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000810 const struct iphdr *tiph = &tunnel->parms.iph;
811 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 u8 tos = tunnel->parms.iph.tos;
Herbert Xu292f4f32009-11-09 08:42:01 +0000813 __be16 df = tiph->frag_off;
Ian Morris67ba4152014-08-24 21:53:10 +0100814 struct rtable *rt; /* Route to the other host */
815 struct net_device *tdev; /* Device to other host */
816 unsigned int max_headroom; /* The extra header space needed */
Al Viroe69a4adc2006-11-14 20:56:00 -0800817 __be32 dst = tiph->daddr;
David S. Miller31e45432011-05-03 20:25:42 -0700818 struct flowi4 fl4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 int mtu;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000820 const struct in6_addr *addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 int addr_type;
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700822 u8 ttl;
823 int err;
Tom Herbert14909662014-09-17 12:25:59 -0700824 u8 protocol = IPPROTO_IPV6;
825 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 if (skb->protocol != htons(ETH_P_IPV6))
828 goto tx_error;
829
Lionel Elie Mamanec2bceb32011-08-13 14:04:38 +0000830 if (tos == 1)
831 tos = ipv6_get_dsfield(iph6);
832
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100833 /* ISATAP (RFC4214) - must come before 6to4 */
834 if (dev->priv_flags & IFF_ISATAP) {
835 struct neighbour *neigh = NULL;
David S. Miller1e2927b2012-01-26 15:23:21 -0500836 bool do_tx_error = false;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100837
Eric Dumazetadf30902009-06-02 05:19:30 +0000838 if (skb_dst(skb))
David S. Miller1e2927b2012-01-26 15:23:21 -0500839 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100840
Ian Morris63159f22015-03-29 14:00:04 +0100841 if (!neigh) {
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300842 net_dbg_ratelimited("nexthop == NULL\n");
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100843 goto tx_error;
844 }
845
Eldad Zack3e866702012-04-01 07:49:01 +0000846 addr6 = (const struct in6_addr *)&neigh->primary_key;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100847 addr_type = ipv6_addr_type(addr6);
848
849 if ((addr_type & IPV6_ADDR_UNICAST) &&
850 ipv6_addr_is_isatap(addr6))
851 dst = addr6->s6_addr32[3];
852 else
David S. Miller1e2927b2012-01-26 15:23:21 -0500853 do_tx_error = true;
854
855 neigh_release(neigh);
856 if (do_tx_error)
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100857 goto tx_error;
858 }
859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 if (!dst)
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000861 dst = try_6rd(tunnel, &iph6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
863 if (!dst) {
864 struct neighbour *neigh = NULL;
David S. Miller1e2927b2012-01-26 15:23:21 -0500865 bool do_tx_error = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
Eric Dumazetadf30902009-06-02 05:19:30 +0000867 if (skb_dst(skb))
David S. Miller1e2927b2012-01-26 15:23:21 -0500868 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Ian Morris63159f22015-03-29 14:00:04 +0100870 if (!neigh) {
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300871 net_dbg_ratelimited("nexthop == NULL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 goto tx_error;
873 }
874
Eldad Zack3e866702012-04-01 07:49:01 +0000875 addr6 = (const struct in6_addr *)&neigh->primary_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 addr_type = ipv6_addr_type(addr6);
877
878 if (addr_type == IPV6_ADDR_ANY) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700879 addr6 = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 addr_type = ipv6_addr_type(addr6);
881 }
882
David S. Miller1e2927b2012-01-26 15:23:21 -0500883 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
884 dst = addr6->s6_addr32[3];
885 else
886 do_tx_error = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
David S. Miller1e2927b2012-01-26 15:23:21 -0500888 neigh_release(neigh);
889 if (do_tx_error)
890 goto tx_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 }
892
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +0200893 rt = ip_route_output_ports(tunnel->net, &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500894 dst, tiph->saddr,
895 0, 0,
896 IPPROTO_IPV6, RT_TOS(tos),
897 tunnel->parms.link);
898 if (IS_ERR(rt)) {
899 dev->stats.tx_carrier_errors++;
900 goto tx_error_icmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 }
902 if (rt->rt_type != RTN_UNICAST) {
903 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000904 dev->stats.tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 goto tx_error_icmp;
906 }
Changli Gaod8d1f302010-06-10 23:31:35 -0700907 tdev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
909 if (tdev == dev) {
910 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000911 dev->stats.collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 goto tx_error;
913 }
914
Tom Herbert14909662014-09-17 12:25:59 -0700915 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT);
916 if (IS_ERR(skb)) {
917 ip_rt_put(rt);
918 goto out;
919 }
920
Herbert Xu292f4f32009-11-09 08:42:01 +0000921 if (df) {
Tom Herbert14909662014-09-17 12:25:59 -0700922 mtu = dst_mtu(&rt->dst) - t_hlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
Herbert Xu292f4f32009-11-09 08:42:01 +0000924 if (mtu < 68) {
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000925 dev->stats.collisions++;
Herbert Xu292f4f32009-11-09 08:42:01 +0000926 ip_rt_put(rt);
927 goto tx_error;
928 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
Herbert Xu292f4f32009-11-09 08:42:01 +0000930 if (mtu < IPV6_MIN_MTU) {
931 mtu = IPV6_MIN_MTU;
932 df = 0;
933 }
934
935 if (tunnel->parms.iph.daddr && skb_dst(skb))
David S. Miller6700c272012-07-17 03:29:28 -0700936 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
Herbert Xu292f4f32009-11-09 08:42:01 +0000937
Eric Dumazet58a47822013-12-16 06:31:23 -0800938 if (skb->len > mtu && !skb_is_gso(skb)) {
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000939 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Herbert Xu292f4f32009-11-09 08:42:01 +0000940 ip_rt_put(rt);
941 goto tx_error;
942 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 }
944
945 if (tunnel->err_count > 0) {
Wei Yongjunbb800872009-02-24 23:37:19 -0800946 if (time_before(jiffies,
947 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 tunnel->err_count--;
949 dst_link_failure(skb);
950 } else
951 tunnel->err_count = 0;
952 }
953
954 /*
955 * Okay, now see if we can stuff it in the buffer as-is.
956 */
Tom Herbert14909662014-09-17 12:25:59 -0700957 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
Patrick McHardycfbba492007-07-09 15:33:40 -0700959 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
960 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
962 if (!new_skb) {
963 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000964 dev->stats.tx_dropped++;
Gao feng66028312013-11-25 17:21:24 +0800965 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000966 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 }
968 if (skb->sk)
969 skb_set_owner_w(new_skb, skb->sk);
970 dev_kfree_skb(skb);
971 skb = new_skb;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700972 iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 }
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700974 ttl = tiph->ttl;
975 if (ttl == 0)
976 ttl = iph6->hop_limit;
977 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
Tom Herbert14909662014-09-17 12:25:59 -0700979 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
Li RongQing6a9eadc2013-12-20 17:20:12 +0800980 ip_rt_put(rt);
Tom Herbert14909662014-09-17 12:25:59 -0700981 goto tx_error;
Li RongQing6a9eadc2013-12-20 17:20:12 +0800982 }
Hannes Frederic Sowa3d483052013-08-18 13:46:52 +0200983
Tom Herbert469471c2014-09-29 20:22:30 -0700984 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
985
Hannes Frederic Sowa1b112872015-04-08 17:01:23 +0200986 err = iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr,
Tom Herbert14909662014-09-17 12:25:59 -0700987 protocol, tos, ttl, df,
Eric Dumazetaad88722014-04-15 13:47:15 -0400988 !net_eq(tunnel->net, dev_net(dev)));
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700989 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000990 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991
992tx_error_icmp:
993 dst_link_failure(skb);
994tx_error:
Gao feng66028312013-11-25 17:21:24 +0800995 kfree_skb(skb);
Eric Dumazet61c1db72013-10-20 20:47:30 -0700996out:
997 dev->stats.tx_errors++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000998 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999}
1000
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001001static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
1002{
1003 struct ip_tunnel *tunnel = netdev_priv(dev);
1004 const struct iphdr *tiph = &tunnel->parms.iph;
1005
Eric Dumazet61c1db72013-10-20 20:47:30 -07001006 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP);
1007 if (IS_ERR(skb))
1008 goto out;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001009
Tom Herbert469471c2014-09-29 20:22:30 -07001010 skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1011
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001012 ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP);
1013 return NETDEV_TX_OK;
Eric Dumazet61c1db72013-10-20 20:47:30 -07001014out:
1015 dev->stats.tx_errors++;
1016 return NETDEV_TX_OK;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001017}
1018
1019static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1020 struct net_device *dev)
1021{
1022 switch (skb->protocol) {
1023 case htons(ETH_P_IP):
1024 ipip_tunnel_xmit(skb, dev);
1025 break;
1026 case htons(ETH_P_IPV6):
1027 ipip6_tunnel_xmit(skb, dev);
1028 break;
1029 default:
1030 goto tx_err;
1031 }
1032
1033 return NETDEV_TX_OK;
1034
1035tx_err:
1036 dev->stats.tx_errors++;
Gao feng66028312013-11-25 17:21:24 +08001037 kfree_skb(skb);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001038 return NETDEV_TX_OK;
1039
1040}
1041
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001042static void ipip6_tunnel_bind_dev(struct net_device *dev)
1043{
1044 struct net_device *tdev = NULL;
1045 struct ip_tunnel *tunnel;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001046 const struct iphdr *iph;
David S. Miller31e45432011-05-03 20:25:42 -07001047 struct flowi4 fl4;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001048
1049 tunnel = netdev_priv(dev);
1050 iph = &tunnel->parms.iph;
1051
1052 if (iph->daddr) {
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001053 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1054 NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -05001055 iph->daddr, iph->saddr,
1056 0, 0,
1057 IPPROTO_IPV6,
1058 RT_TOS(iph->tos),
1059 tunnel->parms.link);
David S. Millerb23dd4f2011-03-02 14:31:35 -08001060
1061 if (!IS_ERR(rt)) {
Changli Gaod8d1f302010-06-10 23:31:35 -07001062 tdev = rt->dst.dev;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001063 ip_rt_put(rt);
1064 }
1065 dev->flags |= IFF_POINTOPOINT;
1066 }
1067
1068 if (!tdev && tunnel->parms.link)
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001069 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001070
1071 if (tdev) {
Tom Herbert14909662014-09-17 12:25:59 -07001072 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1073
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001074 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
Tom Herbert14909662014-09-17 12:25:59 -07001075 dev->mtu = tdev->mtu - t_hlen;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001076 if (dev->mtu < IPV6_MIN_MTU)
1077 dev->mtu = IPV6_MIN_MTU;
1078 }
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001079}
1080
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001081static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
1082{
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001083 struct net *net = t->net;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001084 struct sit_net *sitn = net_generic(net, sit_net_id);
1085
1086 ipip6_tunnel_unlink(sitn, t);
1087 synchronize_net();
1088 t->parms.iph.saddr = p->iph.saddr;
1089 t->parms.iph.daddr = p->iph.daddr;
1090 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1091 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1092 ipip6_tunnel_link(sitn, t);
1093 t->parms.iph.ttl = p->iph.ttl;
1094 t->parms.iph.tos = p->iph.tos;
1095 if (t->parms.link != p->link) {
1096 t->parms.link = p->link;
1097 ipip6_tunnel_bind_dev(t->dev);
1098 }
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +01001099 ip_tunnel_dst_reset_all(t);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001100 netdev_state_change(t->dev);
1101}
1102
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001103#ifdef CONFIG_IPV6_SIT_6RD
1104static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1105 struct ip_tunnel_6rd *ip6rd)
1106{
1107 struct in6_addr prefix;
1108 __be32 relay_prefix;
1109
1110 if (ip6rd->relay_prefixlen > 32 ||
1111 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1112 return -EINVAL;
1113
1114 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1115 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1116 return -EINVAL;
1117 if (ip6rd->relay_prefixlen)
1118 relay_prefix = ip6rd->relay_prefix &
1119 htonl(0xffffffffUL <<
1120 (32 - ip6rd->relay_prefixlen));
1121 else
1122 relay_prefix = 0;
1123 if (relay_prefix != ip6rd->relay_prefix)
1124 return -EINVAL;
1125
1126 t->ip6rd.prefix = prefix;
1127 t->ip6rd.relay_prefix = relay_prefix;
1128 t->ip6rd.prefixlen = ip6rd->prefixlen;
1129 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +01001130 ip_tunnel_dst_reset_all(t);
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001131 netdev_state_change(t->dev);
1132 return 0;
1133}
1134#endif
1135
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136static int
Ian Morris67ba4152014-08-24 21:53:10 +01001137ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138{
1139 int err = 0;
1140 struct ip_tunnel_parm p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001141 struct ip_tunnel_prl prl;
Nicolas Dichtel9aad77c2014-04-16 11:19:33 +02001142 struct ip_tunnel *t = netdev_priv(dev);
1143 struct net *net = t->net;
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001144 struct sit_net *sitn = net_generic(net, sit_net_id);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001145#ifdef CONFIG_IPV6_SIT_6RD
1146 struct ip_tunnel_6rd ip6rd;
1147#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148
1149 switch (cmd) {
1150 case SIOCGETTUNNEL:
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001151#ifdef CONFIG_IPV6_SIT_6RD
1152 case SIOCGET6RD:
1153#endif
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001154 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1156 err = -EFAULT;
1157 break;
1158 }
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001159 t = ipip6_tunnel_locate(net, &p, 0);
Ian Morris63159f22015-03-29 14:00:04 +01001160 if (!t)
Nicolas Dichtel9aad77c2014-04-16 11:19:33 +02001161 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 }
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001163
1164 err = -EFAULT;
1165 if (cmd == SIOCGETTUNNEL) {
1166 memcpy(&p, &t->parms, sizeof(p));
1167 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1168 sizeof(p)))
1169 goto done;
1170#ifdef CONFIG_IPV6_SIT_6RD
1171 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001172 ip6rd.prefix = t->ip6rd.prefix;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001173 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1174 ip6rd.prefixlen = t->ip6rd.prefixlen;
1175 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1176 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1177 sizeof(ip6rd)))
1178 goto done;
1179#endif
1180 }
1181 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 break;
1183
1184 case SIOCADDTUNNEL:
1185 case SIOCCHGTUNNEL:
1186 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001187 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 goto done;
1189
1190 err = -EFAULT;
1191 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1192 goto done;
1193
1194 err = -EINVAL;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001195 if (p.iph.protocol != IPPROTO_IPV6 &&
1196 p.iph.protocol != IPPROTO_IPIP &&
1197 p.iph.protocol != 0)
1198 goto done;
1199 if (p.iph.version != 4 ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1201 goto done;
1202 if (p.iph.ttl)
1203 p.iph.frag_off |= htons(IP_DF);
1204
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001205 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001207 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Ian Morris53b24b82015-03-29 14:00:05 +01001208 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 if (t->dev != dev) {
1210 err = -EEXIST;
1211 break;
1212 }
1213 } else {
1214 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1215 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1216 err = -EINVAL;
1217 break;
1218 }
Patrick McHardy2941a482006-01-08 22:05:26 -08001219 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 }
Nicolas Dichtelf9cd5a52012-11-14 05:14:04 +00001221
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001222 ipip6_tunnel_update(t, &p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 }
1224
1225 if (t) {
1226 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1228 err = -EFAULT;
1229 } else
1230 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1231 break;
1232
1233 case SIOCDELTUNNEL:
1234 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001235 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 goto done;
1237
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001238 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 err = -EFAULT;
1240 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1241 goto done;
1242 err = -ENOENT;
Ian Morrise5d08d72014-11-23 21:28:43 +00001243 t = ipip6_tunnel_locate(net, &p, 0);
Ian Morris63159f22015-03-29 14:00:04 +01001244 if (!t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 goto done;
1246 err = -EPERM;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001247 if (t == netdev_priv(sitn->fb_tunnel_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 goto done;
1249 dev = t->dev;
1250 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001251 unregister_netdevice(dev);
1252 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 break;
1254
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001255 case SIOCGETPRL:
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001256 err = -EINVAL;
1257 if (dev == sitn->fb_tunnel_dev)
1258 goto done;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001259 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1260 break;
1261
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001262 case SIOCADDPRL:
1263 case SIOCDELPRL:
1264 case SIOCCHGPRL:
1265 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001266 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001267 goto done;
1268 err = -EINVAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001269 if (dev == sitn->fb_tunnel_dev)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001270 goto done;
1271 err = -EFAULT;
1272 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1273 goto done;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001274
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001275 switch (cmd) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001276 case SIOCDELPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001277 err = ipip6_tunnel_del_prl(t, &prl);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001278 break;
1279 case SIOCADDPRL:
1280 case SIOCCHGPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001281 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001282 break;
1283 }
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +01001284 ip_tunnel_dst_reset_all(t);
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001285 netdev_state_change(dev);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001286 break;
1287
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001288#ifdef CONFIG_IPV6_SIT_6RD
1289 case SIOCADD6RD:
1290 case SIOCCHG6RD:
1291 case SIOCDEL6RD:
1292 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001293 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001294 goto done;
1295
1296 err = -EFAULT;
1297 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1298 sizeof(ip6rd)))
1299 goto done;
1300
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001301 if (cmd != SIOCDEL6RD) {
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001302 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1303 if (err < 0)
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001304 goto done;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001305 } else
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001306 ipip6_tunnel_clone_6rd(dev, sitn);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001307
1308 err = 0;
1309 break;
1310#endif
1311
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 default:
1313 err = -EINVAL;
1314 }
1315
1316done:
1317 return err;
1318}
1319
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1321{
Tom Herbert14909662014-09-17 12:25:59 -07001322 struct ip_tunnel *tunnel = netdev_priv(dev);
1323 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1324
1325 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - t_hlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 return -EINVAL;
1327 dev->mtu = new_mtu;
1328 return 0;
1329}
1330
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001331static const struct net_device_ops ipip6_netdev_ops = {
Steffen Klassertebe084a2014-11-03 09:19:29 +01001332 .ndo_init = ipip6_tunnel_init,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001333 .ndo_uninit = ipip6_tunnel_uninit,
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001334 .ndo_start_xmit = sit_tunnel_xmit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001335 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1336 .ndo_change_mtu = ipip6_tunnel_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +00001337 .ndo_get_stats64 = ip_tunnel_get_stats64,
Nicolas Dichtel1e995842015-04-02 17:07:02 +02001338 .ndo_get_iflink = ip_tunnel_get_iflink,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001339};
1340
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001341static void ipip6_dev_free(struct net_device *dev)
1342{
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +01001343 struct ip_tunnel *tunnel = netdev_priv(dev);
1344
1345 free_percpu(tunnel->dst_cache);
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001346 free_percpu(dev->tstats);
1347 free_netdev(dev);
1348}
1349
Eric Dumazet61c1db72013-10-20 20:47:30 -07001350#define SIT_FEATURES (NETIF_F_SG | \
1351 NETIF_F_FRAGLIST | \
1352 NETIF_F_HIGHDMA | \
1353 NETIF_F_GSO_SOFTWARE | \
1354 NETIF_F_HW_CSUM)
1355
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356static void ipip6_tunnel_setup(struct net_device *dev)
1357{
Tom Herbert14909662014-09-17 12:25:59 -07001358 struct ip_tunnel *tunnel = netdev_priv(dev);
1359 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1360
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001361 dev->netdev_ops = &ipip6_netdev_ops;
Ian Morris67ba4152014-08-24 21:53:10 +01001362 dev->destructor = ipip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363
1364 dev->type = ARPHRD_SIT;
Tom Herbert14909662014-09-17 12:25:59 -07001365 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1366 dev->mtu = ETH_DATA_LEN - t_hlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 dev->flags = IFF_NOARP;
Eric Dumazet02875872014-10-05 18:38:35 -07001368 netif_keep_dst(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 dev->addr_len = 4;
Eric Dumazet8df40d12010-09-28 02:53:41 +00001370 dev->features |= NETIF_F_LLTX;
Eric Dumazet61c1db72013-10-20 20:47:30 -07001371 dev->features |= SIT_FEATURES;
1372 dev->hw_features |= SIT_FEATURES;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373}
1374
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001375static int ipip6_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001377 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378
1379 tunnel->dev = dev;
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001380 tunnel->net = dev_net(dev);
Steffen Klassertebe084a2014-11-03 09:19:29 +01001381 strcpy(tunnel->parms.name, dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001383 ipip6_tunnel_bind_dev(dev);
WANG Cong1c213bd2014-02-13 11:46:28 -08001384 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001385 if (!dev->tstats)
1386 return -ENOMEM;
1387
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +01001388 tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1389 if (!tunnel->dst_cache) {
1390 free_percpu(dev->tstats);
1391 return -ENOMEM;
1392 }
1393
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001394 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395}
1396
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001397static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398{
Patrick McHardy2941a482006-01-08 22:05:26 -08001399 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 struct iphdr *iph = &tunnel->parms.iph;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001401 struct net *net = dev_net(dev);
1402 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403
1404 tunnel->dev = dev;
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001405 tunnel->net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406
1407 iph->version = 4;
1408 iph->protocol = IPPROTO_IPV6;
1409 iph->ihl = 5;
1410 iph->ttl = 64;
1411
WANG Cong1c213bd2014-02-13 11:46:28 -08001412 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001413 if (!dev->tstats)
1414 return -ENOMEM;
John Stultz827da442013-10-07 15:51:58 -07001415
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +01001416 tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1417 if (!tunnel->dst_cache) {
1418 free_percpu(dev->tstats);
1419 return -ENOMEM;
1420 }
1421
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 dev_hold(dev);
Eric Dumazetcf778b02012-01-12 04:41:32 +00001423 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001424 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425}
1426
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001427static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
1428{
1429 u8 proto;
1430
Nicolas Dichtelc2ff6822013-06-19 12:03:13 +02001431 if (!data || !data[IFLA_IPTUN_PROTO])
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001432 return 0;
1433
1434 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1435 if (proto != IPPROTO_IPV6 &&
1436 proto != IPPROTO_IPIP &&
1437 proto != 0)
1438 return -EINVAL;
1439
1440 return 0;
1441}
1442
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001443static void ipip6_netlink_parms(struct nlattr *data[],
1444 struct ip_tunnel_parm *parms)
1445{
1446 memset(parms, 0, sizeof(*parms));
1447
1448 parms->iph.version = 4;
1449 parms->iph.protocol = IPPROTO_IPV6;
1450 parms->iph.ihl = 5;
1451 parms->iph.ttl = 64;
1452
1453 if (!data)
1454 return;
1455
1456 if (data[IFLA_IPTUN_LINK])
1457 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1458
1459 if (data[IFLA_IPTUN_LOCAL])
Nicolas Dichteld440b722012-11-15 04:06:41 +00001460 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001461
1462 if (data[IFLA_IPTUN_REMOTE])
Nicolas Dichteld440b722012-11-15 04:06:41 +00001463 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001464
1465 if (data[IFLA_IPTUN_TTL]) {
1466 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1467 if (parms->iph.ttl)
1468 parms->iph.frag_off = htons(IP_DF);
1469 }
1470
1471 if (data[IFLA_IPTUN_TOS])
1472 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1473
1474 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1475 parms->iph.frag_off = htons(IP_DF);
1476
1477 if (data[IFLA_IPTUN_FLAGS])
Nicolas Dichteld440b722012-11-15 04:06:41 +00001478 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001479
1480 if (data[IFLA_IPTUN_PROTO])
1481 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1482
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001483}
1484
Tom Herbert14909662014-09-17 12:25:59 -07001485/* This function returns true when ENCAP attributes are present in the nl msg */
1486static bool ipip6_netlink_encap_parms(struct nlattr *data[],
1487 struct ip_tunnel_encap *ipencap)
1488{
1489 bool ret = false;
1490
1491 memset(ipencap, 0, sizeof(*ipencap));
1492
1493 if (!data)
1494 return ret;
1495
1496 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1497 ret = true;
1498 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1499 }
1500
1501 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1502 ret = true;
1503 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1504 }
1505
1506 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1507 ret = true;
Eric Dumazeta409cae2015-02-04 15:12:04 -08001508 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
Tom Herbert14909662014-09-17 12:25:59 -07001509 }
1510
1511 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1512 ret = true;
Eric Dumazeta409cae2015-02-04 15:12:04 -08001513 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
Tom Herbert14909662014-09-17 12:25:59 -07001514 }
1515
1516 return ret;
1517}
1518
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001519#ifdef CONFIG_IPV6_SIT_6RD
1520/* This function returns true when 6RD attributes are present in the nl msg */
1521static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1522 struct ip_tunnel_6rd *ip6rd)
1523{
1524 bool ret = false;
1525 memset(ip6rd, 0, sizeof(*ip6rd));
1526
1527 if (!data)
1528 return ret;
1529
1530 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1531 ret = true;
Jiri Benc67b61f62015-03-29 16:59:26 +02001532 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]);
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001533 }
1534
1535 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1536 ret = true;
1537 ip6rd->relay_prefix =
1538 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1539 }
1540
1541 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1542 ret = true;
1543 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1544 }
1545
1546 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1547 ret = true;
1548 ip6rd->relay_prefixlen =
1549 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1550 }
1551
1552 return ret;
1553}
1554#endif
1555
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001556static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1557 struct nlattr *tb[], struct nlattr *data[])
1558{
1559 struct net *net = dev_net(dev);
1560 struct ip_tunnel *nt;
Tom Herbert14909662014-09-17 12:25:59 -07001561 struct ip_tunnel_encap ipencap;
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001562#ifdef CONFIG_IPV6_SIT_6RD
1563 struct ip_tunnel_6rd ip6rd;
1564#endif
1565 int err;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001566
1567 nt = netdev_priv(dev);
Tom Herbert14909662014-09-17 12:25:59 -07001568
1569 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1570 err = ip_tunnel_encap_setup(nt, &ipencap);
1571 if (err < 0)
1572 return err;
1573 }
1574
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001575 ipip6_netlink_parms(data, &nt->parms);
1576
1577 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1578 return -EEXIST;
1579
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001580 err = ipip6_tunnel_create(dev);
1581 if (err < 0)
1582 return err;
1583
1584#ifdef CONFIG_IPV6_SIT_6RD
1585 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1586 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1587#endif
1588
1589 return err;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001590}
1591
1592static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1593 struct nlattr *data[])
1594{
Nicolas Dichtel86bd68b2013-07-03 17:00:34 +02001595 struct ip_tunnel *t = netdev_priv(dev);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001596 struct ip_tunnel_parm p;
Tom Herbert14909662014-09-17 12:25:59 -07001597 struct ip_tunnel_encap ipencap;
Nicolas Dichtel86bd68b2013-07-03 17:00:34 +02001598 struct net *net = t->net;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001599 struct sit_net *sitn = net_generic(net, sit_net_id);
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001600#ifdef CONFIG_IPV6_SIT_6RD
1601 struct ip_tunnel_6rd ip6rd;
1602#endif
Tom Herbert14909662014-09-17 12:25:59 -07001603 int err;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001604
1605 if (dev == sitn->fb_tunnel_dev)
1606 return -EINVAL;
1607
Tom Herbert14909662014-09-17 12:25:59 -07001608 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1609 err = ip_tunnel_encap_setup(t, &ipencap);
1610 if (err < 0)
1611 return err;
1612 }
1613
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001614 ipip6_netlink_parms(data, &p);
1615
1616 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1617 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1618 return -EINVAL;
1619
1620 t = ipip6_tunnel_locate(net, &p, 0);
1621
1622 if (t) {
1623 if (t->dev != dev)
1624 return -EEXIST;
1625 } else
1626 t = netdev_priv(dev);
1627
1628 ipip6_tunnel_update(t, &p);
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001629
1630#ifdef CONFIG_IPV6_SIT_6RD
1631 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1632 return ipip6_tunnel_update_6rd(t, &ip6rd);
1633#endif
1634
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001635 return 0;
1636}
1637
Nicolas Dichtele4c94a92012-11-14 05:14:06 +00001638static size_t ipip6_get_size(const struct net_device *dev)
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001639{
1640 return
1641 /* IFLA_IPTUN_LINK */
1642 nla_total_size(4) +
1643 /* IFLA_IPTUN_LOCAL */
1644 nla_total_size(4) +
1645 /* IFLA_IPTUN_REMOTE */
1646 nla_total_size(4) +
1647 /* IFLA_IPTUN_TTL */
1648 nla_total_size(1) +
1649 /* IFLA_IPTUN_TOS */
1650 nla_total_size(1) +
Nicolas Dichtela12c9a82012-11-14 05:14:05 +00001651 /* IFLA_IPTUN_PMTUDISC */
1652 nla_total_size(1) +
1653 /* IFLA_IPTUN_FLAGS */
1654 nla_total_size(2) +
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001655 /* IFLA_IPTUN_PROTO */
1656 nla_total_size(1) +
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001657#ifdef CONFIG_IPV6_SIT_6RD
1658 /* IFLA_IPTUN_6RD_PREFIX */
1659 nla_total_size(sizeof(struct in6_addr)) +
1660 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1661 nla_total_size(4) +
1662 /* IFLA_IPTUN_6RD_PREFIXLEN */
1663 nla_total_size(2) +
1664 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1665 nla_total_size(2) +
1666#endif
Tom Herbert14909662014-09-17 12:25:59 -07001667 /* IFLA_IPTUN_ENCAP_TYPE */
1668 nla_total_size(2) +
1669 /* IFLA_IPTUN_ENCAP_FLAGS */
1670 nla_total_size(2) +
1671 /* IFLA_IPTUN_ENCAP_SPORT */
1672 nla_total_size(2) +
1673 /* IFLA_IPTUN_ENCAP_DPORT */
1674 nla_total_size(2) +
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001675 0;
1676}
1677
Nicolas Dichtele4c94a92012-11-14 05:14:06 +00001678static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001679{
1680 struct ip_tunnel *tunnel = netdev_priv(dev);
1681 struct ip_tunnel_parm *parm = &tunnel->parms;
1682
1683 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
Jiri Benc930345e2015-03-29 16:59:25 +02001684 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1685 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001686 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
Nicolas Dichtela12c9a82012-11-14 05:14:05 +00001687 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1688 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1689 !!(parm->iph.frag_off & htons(IP_DF))) ||
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001690 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
Nicolas Dichteld440b722012-11-15 04:06:41 +00001691 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001692 goto nla_put_failure;
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001693
1694#ifdef CONFIG_IPV6_SIT_6RD
Jiri Benc930345e2015-03-29 16:59:25 +02001695 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX,
1696 &tunnel->ip6rd.prefix) ||
1697 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1698 tunnel->ip6rd.relay_prefix) ||
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001699 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1700 tunnel->ip6rd.prefixlen) ||
1701 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1702 tunnel->ip6rd.relay_prefixlen))
1703 goto nla_put_failure;
1704#endif
1705
Tom Herbert14909662014-09-17 12:25:59 -07001706 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
1707 tunnel->encap.type) ||
Eric Dumazeta409cae2015-02-04 15:12:04 -08001708 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
Tom Herbert14909662014-09-17 12:25:59 -07001709 tunnel->encap.sport) ||
Eric Dumazeta409cae2015-02-04 15:12:04 -08001710 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
Tom Herbert14909662014-09-17 12:25:59 -07001711 tunnel->encap.dport) ||
1712 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
Tom Herberte1b2cb62014-11-05 16:49:38 -08001713 tunnel->encap.flags))
Tom Herbert14909662014-09-17 12:25:59 -07001714 goto nla_put_failure;
1715
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001716 return 0;
1717
1718nla_put_failure:
1719 return -EMSGSIZE;
1720}
1721
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001722static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1723 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1724 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1725 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1726 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1727 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1728 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1729 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001730 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001731#ifdef CONFIG_IPV6_SIT_6RD
1732 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1733 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1734 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1735 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1736#endif
Tom Herbert14909662014-09-17 12:25:59 -07001737 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
1738 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
1739 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
1740 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001741};
1742
Willem de Bruijn94342662013-11-13 21:27:38 -05001743static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1744{
1745 struct net *net = dev_net(dev);
1746 struct sit_net *sitn = net_generic(net, sit_net_id);
1747
1748 if (dev != sitn->fb_tunnel_dev)
1749 unregister_netdevice_queue(dev, head);
1750}
1751
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001752static struct rtnl_link_ops sit_link_ops __read_mostly = {
1753 .kind = "sit",
1754 .maxtype = IFLA_IPTUN_MAX,
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001755 .policy = ipip6_policy,
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001756 .priv_size = sizeof(struct ip_tunnel),
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001757 .setup = ipip6_tunnel_setup,
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001758 .validate = ipip6_validate,
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001759 .newlink = ipip6_newlink,
1760 .changelink = ipip6_changelink,
Nicolas Dichtele4c94a92012-11-14 05:14:06 +00001761 .get_size = ipip6_get_size,
1762 .fill_info = ipip6_fill_info,
Willem de Bruijn94342662013-11-13 21:27:38 -05001763 .dellink = ipip6_dellink,
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01001764 .get_link_net = ip_tunnel_get_link_net,
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001765};
1766
Eric Dumazet6dcd8142010-08-30 07:04:14 +00001767static struct xfrm_tunnel sit_handler __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 .handler = ipip6_rcv,
1769 .err_handler = ipip6_err,
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001770 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771};
1772
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001773static struct xfrm_tunnel ipip_handler __read_mostly = {
1774 .handler = ipip_rcv,
1775 .err_handler = ipip6_err,
1776 .priority = 2,
1777};
1778
Willem de Bruijn94342662013-11-13 21:27:38 -05001779static void __net_exit sit_destroy_tunnels(struct net *net,
1780 struct list_head *head)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001781{
Willem de Bruijn94342662013-11-13 21:27:38 -05001782 struct sit_net *sitn = net_generic(net, sit_net_id);
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001783 struct net_device *dev, *aux;
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001784 int prio;
1785
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001786 for_each_netdev_safe(net, dev, aux)
1787 if (dev->rtnl_link_ops == &sit_link_ops)
1788 unregister_netdevice_queue(dev, head);
1789
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001790 for (prio = 1; prio < 4; prio++) {
1791 int h;
1792 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001793 struct ip_tunnel *t;
Eric Dumazet62808f92009-10-28 04:37:43 +00001794
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001795 t = rtnl_dereference(sitn->tunnels[prio][h]);
Ian Morris53b24b82015-03-29 14:00:05 +01001796 while (t) {
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001797 /* If dev is in the same netns, it has already
1798 * been added to the list by the previous loop.
1799 */
Nicolas Dichtelfc8f9992013-08-13 17:51:10 +02001800 if (!net_eq(dev_net(t->dev), net))
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001801 unregister_netdevice_queue(t->dev,
1802 head);
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001803 t = rtnl_dereference(t->next);
Eric Dumazet62808f92009-10-28 04:37:43 +00001804 }
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001805 }
1806 }
1807}
1808
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001809static int __net_init sit_init_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001810{
Eric W. Biederman67101172009-11-29 15:46:16 +00001811 struct sit_net *sitn = net_generic(net, sit_net_id);
Ted Feng72b36012011-12-08 00:46:21 +00001812 struct ip_tunnel *t;
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001813 int err;
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001814
Pavel Emelyanov29182172008-04-16 01:16:38 -07001815 sitn->tunnels[0] = sitn->tunnels_wc;
1816 sitn->tunnels[1] = sitn->tunnels_l;
1817 sitn->tunnels[2] = sitn->tunnels_r;
1818 sitn->tunnels[3] = sitn->tunnels_r_l;
1819
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001820 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
Tom Gundersenc835a672014-07-14 16:37:24 +02001821 NET_NAME_UNKNOWN,
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001822 ipip6_tunnel_setup);
1823 if (!sitn->fb_tunnel_dev) {
1824 err = -ENOMEM;
1825 goto err_alloc_dev;
1826 }
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001827 dev_net_set(sitn->fb_tunnel_dev, net);
Nicolas Dichtel205983c2013-10-01 18:04:59 +02001828 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001829 /* FB netdevice is special: we have one, and only one per netns.
1830 * Allowing to move it to another netns is clearly unsafe.
1831 */
1832 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001833
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001834 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1835 if (err)
1836 goto err_dev_free;
1837
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001838 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
Ian Morrise5d08d72014-11-23 21:28:43 +00001839 err = register_netdev(sitn->fb_tunnel_dev);
1840 if (err)
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001841 goto err_reg_dev;
1842
Ted Feng72b36012011-12-08 00:46:21 +00001843 t = netdev_priv(sitn->fb_tunnel_dev);
1844
1845 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001846 return 0;
1847
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001848err_reg_dev:
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001849 dev_put(sitn->fb_tunnel_dev);
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001850err_dev_free:
1851 ipip6_dev_free(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001852err_alloc_dev:
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001853 return err;
1854}
1855
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001856static void __net_exit sit_exit_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001857{
Eric Dumazet62808f92009-10-28 04:37:43 +00001858 LIST_HEAD(list);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001859
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001860 rtnl_lock();
Willem de Bruijn94342662013-11-13 21:27:38 -05001861 sit_destroy_tunnels(net, &list);
Eric Dumazet62808f92009-10-28 04:37:43 +00001862 unregister_netdevice_many(&list);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001863 rtnl_unlock();
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001864}
1865
1866static struct pernet_operations sit_net_ops = {
1867 .init = sit_init_net,
1868 .exit = sit_exit_net,
Eric W. Biederman67101172009-11-29 15:46:16 +00001869 .id = &sit_net_id,
1870 .size = sizeof(struct sit_net),
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001871};
1872
Adrian Bunk89c89452006-11-20 16:56:48 -08001873static void __exit sit_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874{
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001875 rtnl_link_unregister(&sit_link_ops);
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001876 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001877 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001878
Eric W. Biederman67101172009-11-29 15:46:16 +00001879 unregister_pernet_device(&sit_net_ops);
Eric Dumazetef9a9d12009-10-23 17:51:26 +00001880 rcu_barrier(); /* Wait for completion of call_rcu()'s */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881}
1882
Adrian Bunk89c89452006-11-20 16:56:48 -08001883static int __init sit_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884{
1885 int err;
1886
Joe Perchesf3213832012-05-15 14:11:53 +00001887 pr_info("IPv6 over IPv4 tunneling driver\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888
Eric W. Biederman67101172009-11-29 15:46:16 +00001889 err = register_pernet_device(&sit_net_ops);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001890 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001891 return err;
1892 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1893 if (err < 0) {
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001894 pr_info("%s: can't register ip6ip4\n", __func__);
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001895 goto xfrm_tunnel_failed;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001896 }
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001897 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1898 if (err < 0) {
1899 pr_info("%s: can't register ip4ip4\n", __func__);
1900 goto xfrm_tunnel4_failed;
1901 }
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001902 err = rtnl_link_register(&sit_link_ops);
1903 if (err < 0)
1904 goto rtnl_link_failed;
1905
1906out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 return err;
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001908
1909rtnl_link_failed:
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001910 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1911xfrm_tunnel4_failed:
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001912 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1913xfrm_tunnel_failed:
1914 unregister_pernet_device(&sit_net_ops);
1915 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916}
Joerg Roedel989e5b92006-10-10 14:47:44 -07001917
1918module_init(sit_init);
1919module_exit(sit_cleanup);
Jan Dittmer39c85082006-10-13 15:05:53 -07001920MODULE_LICENSE("GPL");
Tom Gundersenf98f89a2014-05-15 23:21:30 +02001921MODULE_ALIAS_RTNL_LINK("sit");
Vasiliy Kulikov8909c9a2011-03-02 00:33:13 +03001922MODULE_ALIAS_NETDEV("sit0");