blob: 182b6a9be29dfba5514bb74c840afb36cbc367b0 [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
Thadeu Lima de Souza Cascardo87e57392016-01-25 11:29:19 -0200204 dev->rtnl_link_ops = &sit_link_ops;
205
Nicolas Dichtelf3723412012-11-14 05:14:07 +0000206 err = register_netdevice(dev);
207 if (err < 0)
208 goto out;
209
Steffen Klassertebe084a2014-11-03 09:19:29 +0100210 ipip6_tunnel_clone_6rd(dev, sitn);
211
Nicolas Dichtelf3723412012-11-14 05:14:07 +0000212 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 }
Paolo Abenie09acdd2016-02-12 15:43:55 +0100478 dst_cache_reset(&tunnel->dst_cache);
Eric Dumazet3a43be32010-09-15 11:35:10 +0000479 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480}
481
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800482static int ipip6_err(struct sk_buff *skb, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000484 const struct iphdr *iph = (const struct iphdr *)skb->data;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300485 const int type = icmp_hdr(skb)->type;
486 const int code = icmp_hdr(skb)->code;
Eric Dumazet20e19542016-06-18 21:52:06 -0700487 unsigned int data_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 struct ip_tunnel *t;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800489 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491 switch (type) {
492 default:
493 case ICMP_PARAMETERPROB:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800494 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
496 case ICMP_DEST_UNREACH:
497 switch (code) {
498 case ICMP_SR_FAILED:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 /* Impossible event. */
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800500 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 default:
502 /* All others are translated to HOST_UNREACH.
503 rfc2003 contains "deep thoughts" about NET_UNREACH,
504 I believe they are just ether pollution. --ANK
505 */
506 break;
507 }
508 break;
509 case ICMP_TIME_EXCEEDED:
510 if (code != ICMP_EXC_TTL)
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800511 return 0;
Eric Dumazet20e19542016-06-18 21:52:06 -0700512 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700514 case ICMP_REDIRECT:
515 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 }
517
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800518 err = -ENOENT;
519
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000520 t = ipip6_tunnel_lookup(dev_net(skb->dev),
521 skb->dev,
522 iph->daddr,
523 iph->saddr);
Ian Morris63159f22015-03-29 14:00:04 +0100524 if (!t)
David S. Miller36393392012-06-14 22:21:46 -0700525 goto out;
526
527 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
528 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
Simon Hormand5d87602016-06-16 17:06:19 +0900529 t->parms.link, 0, iph->protocol, 0);
David S. Miller36393392012-06-14 22:21:46 -0700530 err = 0;
531 goto out;
532 }
David S. Millerec18d9a2012-07-12 00:25:15 -0700533 if (type == ICMP_REDIRECT) {
Dmitry Popov23468292014-06-06 23:19:21 +0400534 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
Simon Hormand5d87602016-06-16 17:06:19 +0900535 iph->protocol, 0);
David S. Millerec18d9a2012-07-12 00:25:15 -0700536 err = 0;
537 goto out;
538 }
David S. Miller36393392012-06-14 22:21:46 -0700539
Eric Dumazet2d7a3b22016-06-18 21:52:04 -0700540 err = 0;
Eric Dumazet20e19542016-06-18 21:52:06 -0700541 if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 goto out;
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800543
Eric Dumazet2d7a3b22016-06-18 21:52:04 -0700544 if (t->parms.iph.daddr == 0)
Oussama Ghorbelca15a072013-11-22 16:23:20 +0100545 goto out;
546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
548 goto out;
549
Wei Yongjunbb800872009-02-24 23:37:19 -0800550 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 t->err_count++;
552 else
553 t->err_count = 1;
554 t->err_time = jiffies;
555out:
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -0800556 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000559static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
560 const struct in6_addr *v6addr)
561{
562 __be32 v4embed = 0;
563 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
564 return true;
565 return false;
566}
567
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300568/* Checks if an address matches an address on the tunnel interface.
569 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
570 * Long story:
571 * This function is called after we considered the packet as spoofed
572 * in is_spoofed_6rd.
573 * We may have a router that is doing NAT for proto 41 packets
574 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
575 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
576 * function will return true, dropping the packet.
577 * But, we can still check if is spoofed against the IP
578 * addresses associated with the interface.
579 */
580static bool only_dnatted(const struct ip_tunnel *tunnel,
581 const struct in6_addr *v6dst)
582{
583 int prefix_len;
584
585#ifdef CONFIG_IPV6_SIT_6RD
586 prefix_len = tunnel->ip6rd.prefixlen + 32
587 - tunnel->ip6rd.relay_prefixlen;
588#else
589 prefix_len = 48;
590#endif
591 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
592}
593
594/* Returns true if a packet is spoofed */
595static bool packet_is_spoofed(struct sk_buff *skb,
596 const struct iphdr *iph,
597 struct ip_tunnel *tunnel)
598{
599 const struct ipv6hdr *ipv6h;
600
601 if (tunnel->dev->priv_flags & IFF_ISATAP) {
602 if (!isatap_chksrc(skb, iph, tunnel))
603 return true;
604
605 return false;
606 }
607
608 if (tunnel->dev->flags & IFF_POINTOPOINT)
609 return false;
610
611 ipv6h = ipv6_hdr(skb);
612
613 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
614 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
615 &iph->saddr, &ipv6h->saddr,
616 &iph->daddr, &ipv6h->daddr);
617 return true;
618 }
619
620 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
621 return false;
622
623 if (only_dnatted(tunnel, &ipv6h->daddr))
624 return false;
625
626 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
627 &iph->saddr, &ipv6h->saddr,
628 &iph->daddr, &ipv6h->daddr);
629 return true;
630}
631
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632static int ipip6_rcv(struct sk_buff *skb)
633{
Hannes Frederic Sowa1ad759d2013-01-18 09:18:17 +0000634 const struct iphdr *iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 struct ip_tunnel *tunnel;
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000636 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Sascha Hlusiak4fddbf52009-05-19 12:56:49 +0000638 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
639 iph->saddr, iph->daddr);
Ian Morris53b24b82015-03-29 14:00:05 +0100640 if (tunnel) {
Li RongQing8f849852014-01-04 13:57:59 +0800641 struct pcpu_sw_netstats *tstats;
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000642
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000643 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
644 tunnel->parms.iph.protocol != 0)
645 goto out;
646
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700647 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700648 skb_reset_network_header(skb);
Patrick McHardy8cdfab82006-01-06 23:04:01 -0800649 IPCB(skb)->flags = 0;
Jesse Grossa09a4c82016-03-19 09:32:02 -0700650 skb->dev = tunnel->dev;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100651
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300652 if (packet_is_spoofed(skb, iph, tunnel)) {
653 tunnel->dev->stats.rx_errors++;
654 goto out;
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000655 }
656
Jesse Grossa09a4c82016-03-19 09:32:02 -0700657 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
658 !net_eq(tunnel->net, dev_net(tunnel->dev))))
659 goto out;
Nicolas Dichtelf4e0b4c2012-11-27 03:07:11 +0000660
661 err = IP_ECN_decapsulate(iph, skb);
662 if (unlikely(err)) {
663 if (log_ecn_error)
664 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
665 &iph->saddr, iph->tos);
666 if (err > 1) {
667 ++tunnel->dev->stats.rx_frame_errors;
668 ++tunnel->dev->stats.rx_errors;
669 goto out;
670 }
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100671 }
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700672
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000673 tstats = this_cpu_ptr(tunnel->dev->tstats);
Li RongQingc3ac17c2014-01-02 08:49:36 +0800674 u64_stats_update_begin(&tstats->syncp);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000675 tstats->rx_packets++;
676 tstats->rx_bytes += skb->len;
Li RongQingc3ac17c2014-01-02 08:49:36 +0800677 u64_stats_update_end(&tstats->syncp);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000678
Eric Dumazetcaf586e2010-09-30 21:06:55 +0000679 netif_rx(skb);
Eric Dumazet8990f462010-09-20 00:12:11 +0000680
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 return 0;
682 }
683
David McCullough6dcdd1b2010-11-29 19:32:34 +0000684 /* no tunnel matched, let upstream know, ipsec may handle it */
David McCullough6dcdd1b2010-11-29 19:32:34 +0000685 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686out:
David S. Miller36ca34c2008-05-08 23:40:26 -0700687 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 return 0;
689}
690
Simon Horman49dbe7a2016-07-07 07:56:13 +0200691static const struct tnl_ptk_info ipip_tpi = {
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000692 /* no tunnel info required for ipip. */
693 .proto = htons(ETH_P_IP),
694};
695
Simon Horman49dbe7a2016-07-07 07:56:13 +0200696#if IS_ENABLED(CONFIG_MPLS)
697static const struct tnl_ptk_info mplsip_tpi = {
698 /* no tunnel info required for mplsip. */
699 .proto = htons(ETH_P_MPLS_UC),
700};
701#endif
702
703static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000704{
Pravin B Shelar3d7b46c2013-06-17 17:50:02 -0700705 const struct iphdr *iph;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000706 struct ip_tunnel *tunnel;
707
Pravin B Shelar3d7b46c2013-06-17 17:50:02 -0700708 iph = ip_hdr(skb);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000709 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
710 iph->saddr, iph->daddr);
Ian Morris53b24b82015-03-29 14:00:05 +0100711 if (tunnel) {
Simon Horman49dbe7a2016-07-07 07:56:13 +0200712 const struct tnl_ptk_info *tpi;
713
714 if (tunnel->parms.iph.protocol != ipproto &&
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000715 tunnel->parms.iph.protocol != 0)
716 goto drop;
717
718 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
719 goto drop;
Simon Horman49dbe7a2016-07-07 07:56:13 +0200720#if IS_ENABLED(CONFIG_MPLS)
721 if (ipproto == IPPROTO_MPLS)
722 tpi = &mplsip_tpi;
723 else
724#endif
725 tpi = &ipip_tpi;
726 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
Li Hongjun737e8282013-08-28 11:54:50 +0200727 goto drop;
Simon Horman49dbe7a2016-07-07 07:56:13 +0200728 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000729 }
730
731 return 1;
732
733drop:
734 kfree_skb(skb);
735 return 0;
736}
737
Simon Horman49dbe7a2016-07-07 07:56:13 +0200738static int ipip_rcv(struct sk_buff *skb)
739{
740 return sit_tunnel_rcv(skb, IPPROTO_IPIP);
741}
742
743#if IS_ENABLED(CONFIG_MPLS)
744static int mplsip_rcv(struct sk_buff *skb)
745{
746 return sit_tunnel_rcv(skb, IPPROTO_MPLS);
747}
748#endif
749
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000750/*
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000751 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
752 * stores the embedded IPv4 address in v4dst and returns true.
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000753 */
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000754static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
755 __be32 *v4dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756{
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000757#ifdef CONFIG_IPV6_SIT_6RD
758 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
759 tunnel->ip6rd.prefixlen)) {
Eric Dumazet3a43be32010-09-15 11:35:10 +0000760 unsigned int pbw0, pbi0;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000761 int pbi1;
762 u32 d;
763
764 pbw0 = tunnel->ip6rd.prefixlen >> 5;
765 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
766
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000767 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000768 tunnel->ip6rd.relay_prefixlen;
769
770 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
771 if (pbi1 > 0)
YOSHIFUJI Hideaki / 吉藤英明e7db38c2009-10-11 03:44:45 +0000772 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000773 (32 - pbi1);
774
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000775 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
776 return true;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000777 }
778#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 if (v6dst->s6_addr16[0] == htons(0x2002)) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900780 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000781 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
782 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 }
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +0000784#endif
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000785 return false;
786}
787
788static inline __be32 try_6rd(struct ip_tunnel *tunnel,
789 const struct in6_addr *v6dst)
790{
791 __be32 dst = 0;
792 check_6rd(tunnel, v6dst, &dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 return dst;
794}
795
796/*
797 * This function assumes it is being called from dev_queue_xmit()
798 * and that skb is filled properly by that function.
799 */
800
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000801static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
802 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803{
Patrick McHardy2941a482006-01-08 22:05:26 -0800804 struct ip_tunnel *tunnel = netdev_priv(dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000805 const struct iphdr *tiph = &tunnel->parms.iph;
806 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 u8 tos = tunnel->parms.iph.tos;
Herbert Xu292f4f32009-11-09 08:42:01 +0000808 __be16 df = tiph->frag_off;
Ian Morris67ba4152014-08-24 21:53:10 +0100809 struct rtable *rt; /* Route to the other host */
810 struct net_device *tdev; /* Device to other host */
811 unsigned int max_headroom; /* The extra header space needed */
Al Viroe69a4adc2006-11-14 20:56:00 -0800812 __be32 dst = tiph->daddr;
David S. Miller31e45432011-05-03 20:25:42 -0700813 struct flowi4 fl4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 int mtu;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000815 const struct in6_addr *addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 int addr_type;
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700817 u8 ttl;
Tom Herbert14909662014-09-17 12:25:59 -0700818 u8 protocol = IPPROTO_IPV6;
819 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
Lionel Elie Mamanec2bceb32011-08-13 14:04:38 +0000821 if (tos == 1)
822 tos = ipv6_get_dsfield(iph6);
823
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100824 /* ISATAP (RFC4214) - must come before 6to4 */
825 if (dev->priv_flags & IFF_ISATAP) {
826 struct neighbour *neigh = NULL;
David S. Miller1e2927b2012-01-26 15:23:21 -0500827 bool do_tx_error = false;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100828
Eric Dumazetadf30902009-06-02 05:19:30 +0000829 if (skb_dst(skb))
David S. Miller1e2927b2012-01-26 15:23:21 -0500830 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100831
Ian Morris63159f22015-03-29 14:00:04 +0100832 if (!neigh) {
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300833 net_dbg_ratelimited("nexthop == NULL\n");
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100834 goto tx_error;
835 }
836
Eldad Zack3e866702012-04-01 07:49:01 +0000837 addr6 = (const struct in6_addr *)&neigh->primary_key;
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100838 addr_type = ipv6_addr_type(addr6);
839
840 if ((addr_type & IPV6_ADDR_UNICAST) &&
841 ipv6_addr_is_isatap(addr6))
842 dst = addr6->s6_addr32[3];
843 else
David S. Miller1e2927b2012-01-26 15:23:21 -0500844 do_tx_error = true;
845
846 neigh_release(neigh);
847 if (do_tx_error)
Fred L. Templinc7dc89c2007-11-29 22:11:40 +1100848 goto tx_error;
849 }
850
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 if (!dst)
Hannes Frederic Sowa218774d2013-01-29 08:24:25 +0000852 dst = try_6rd(tunnel, &iph6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
854 if (!dst) {
855 struct neighbour *neigh = NULL;
David S. Miller1e2927b2012-01-26 15:23:21 -0500856 bool do_tx_error = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
Eric Dumazetadf30902009-06-02 05:19:30 +0000858 if (skb_dst(skb))
David S. Miller1e2927b2012-01-26 15:23:21 -0500859 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Ian Morris63159f22015-03-29 14:00:04 +0100861 if (!neigh) {
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +0300862 net_dbg_ratelimited("nexthop == NULL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 goto tx_error;
864 }
865
Eldad Zack3e866702012-04-01 07:49:01 +0000866 addr6 = (const struct in6_addr *)&neigh->primary_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 addr_type = ipv6_addr_type(addr6);
868
869 if (addr_type == IPV6_ADDR_ANY) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700870 addr6 = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 addr_type = ipv6_addr_type(addr6);
872 }
873
David S. Miller1e2927b2012-01-26 15:23:21 -0500874 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
875 dst = addr6->s6_addr32[3];
876 else
877 do_tx_error = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
David S. Miller1e2927b2012-01-26 15:23:21 -0500879 neigh_release(neigh);
880 if (do_tx_error)
881 goto tx_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 }
883
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +0200884 rt = ip_route_output_ports(tunnel->net, &fl4, NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -0500885 dst, tiph->saddr,
886 0, 0,
887 IPPROTO_IPV6, RT_TOS(tos),
888 tunnel->parms.link);
889 if (IS_ERR(rt)) {
890 dev->stats.tx_carrier_errors++;
891 goto tx_error_icmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 }
893 if (rt->rt_type != RTN_UNICAST) {
894 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000895 dev->stats.tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 goto tx_error_icmp;
897 }
Changli Gaod8d1f302010-06-10 23:31:35 -0700898 tdev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
900 if (tdev == dev) {
901 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000902 dev->stats.collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 goto tx_error;
904 }
905
Tom Herbert7e133182016-05-18 09:06:10 -0700906 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) {
Tom Herbert14909662014-09-17 12:25:59 -0700907 ip_rt_put(rt);
Alexander Duyckaed069d2016-04-14 15:33:37 -0400908 goto tx_error;
Tom Herbert14909662014-09-17 12:25:59 -0700909 }
910
Herbert Xu292f4f32009-11-09 08:42:01 +0000911 if (df) {
Tom Herbert14909662014-09-17 12:25:59 -0700912 mtu = dst_mtu(&rt->dst) - t_hlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
Herbert Xu292f4f32009-11-09 08:42:01 +0000914 if (mtu < 68) {
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000915 dev->stats.collisions++;
Herbert Xu292f4f32009-11-09 08:42:01 +0000916 ip_rt_put(rt);
917 goto tx_error;
918 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
Herbert Xu292f4f32009-11-09 08:42:01 +0000920 if (mtu < IPV6_MIN_MTU) {
921 mtu = IPV6_MIN_MTU;
922 df = 0;
923 }
924
925 if (tunnel->parms.iph.daddr && skb_dst(skb))
David S. Miller6700c272012-07-17 03:29:28 -0700926 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
Herbert Xu292f4f32009-11-09 08:42:01 +0000927
Eric Dumazet58a47822013-12-16 06:31:23 -0800928 if (skb->len > mtu && !skb_is_gso(skb)) {
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000929 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Herbert Xu292f4f32009-11-09 08:42:01 +0000930 ip_rt_put(rt);
931 goto tx_error;
932 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 }
934
935 if (tunnel->err_count > 0) {
Wei Yongjunbb800872009-02-24 23:37:19 -0800936 if (time_before(jiffies,
937 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 tunnel->err_count--;
939 dst_link_failure(skb);
940 } else
941 tunnel->err_count = 0;
942 }
943
944 /*
945 * Okay, now see if we can stuff it in the buffer as-is.
946 */
Tom Herbert14909662014-09-17 12:25:59 -0700947 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948
Patrick McHardycfbba492007-07-09 15:33:40 -0700949 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
950 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
952 if (!new_skb) {
953 ip_rt_put(rt);
Eric Dumazet15fc1f72010-09-27 00:38:18 +0000954 dev->stats.tx_dropped++;
Gao feng66028312013-11-25 17:21:24 +0800955 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000956 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 }
958 if (skb->sk)
959 skb_set_owner_w(new_skb, skb->sk);
960 dev_kfree_skb(skb);
961 skb = new_skb;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700962 iph6 = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 }
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700964 ttl = tiph->ttl;
965 if (ttl == 0)
966 ttl = iph6->hop_limit;
967 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
Tom Herbert14909662014-09-17 12:25:59 -0700969 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
Li RongQing6a9eadc2013-12-20 17:20:12 +0800970 ip_rt_put(rt);
Tom Herbert14909662014-09-17 12:25:59 -0700971 goto tx_error;
Li RongQing6a9eadc2013-12-20 17:20:12 +0800972 }
Hannes Frederic Sowa3d483052013-08-18 13:46:52 +0200973
Tom Herbert469471c2014-09-29 20:22:30 -0700974 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
975
Pravin B Shelar039f5062015-12-24 14:34:54 -0800976 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
977 df, !net_eq(tunnel->net, dev_net(dev)));
Patrick McHardy6ed10652009-06-23 06:03:08 +0000978 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979
980tx_error_icmp:
981 dst_link_failure(skb);
982tx_error:
Gao feng66028312013-11-25 17:21:24 +0800983 kfree_skb(skb);
Eric Dumazet61c1db72013-10-20 20:47:30 -0700984 dev->stats.tx_errors++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000985 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986}
987
Simon Horman49dbe7a2016-07-07 07:56:13 +0200988static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb,
989 struct net_device *dev, u8 ipproto)
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000990{
991 struct ip_tunnel *tunnel = netdev_priv(dev);
992 const struct iphdr *tiph = &tunnel->parms.iph;
993
Tom Herbert7e133182016-05-18 09:06:10 -0700994 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
Alexander Duyckaed069d2016-04-14 15:33:37 -0400995 goto tx_error;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +0000996
Simon Horman49dbe7a2016-07-07 07:56:13 +0200997 skb_set_inner_ipproto(skb, ipproto);
Tom Herbert469471c2014-09-29 20:22:30 -0700998
Simon Horman49dbe7a2016-07-07 07:56:13 +0200999 ip_tunnel_xmit(skb, dev, tiph, ipproto);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001000 return NETDEV_TX_OK;
Alexander Duyckaed069d2016-04-14 15:33:37 -04001001tx_error:
1002 kfree_skb(skb);
Eric Dumazet61c1db72013-10-20 20:47:30 -07001003 dev->stats.tx_errors++;
1004 return NETDEV_TX_OK;
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001005}
1006
1007static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1008 struct net_device *dev)
1009{
1010 switch (skb->protocol) {
1011 case htons(ETH_P_IP):
Simon Horman49dbe7a2016-07-07 07:56:13 +02001012 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001013 break;
1014 case htons(ETH_P_IPV6):
1015 ipip6_tunnel_xmit(skb, dev);
1016 break;
Simon Horman49dbe7a2016-07-07 07:56:13 +02001017#if IS_ENABLED(CONFIG_MPLS)
1018 case htons(ETH_P_MPLS_UC):
1019 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS);
1020 break;
1021#endif
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001022 default:
1023 goto tx_err;
1024 }
1025
1026 return NETDEV_TX_OK;
1027
1028tx_err:
1029 dev->stats.tx_errors++;
Gao feng66028312013-11-25 17:21:24 +08001030 kfree_skb(skb);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001031 return NETDEV_TX_OK;
1032
1033}
1034
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001035static void ipip6_tunnel_bind_dev(struct net_device *dev)
1036{
1037 struct net_device *tdev = NULL;
1038 struct ip_tunnel *tunnel;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001039 const struct iphdr *iph;
David S. Miller31e45432011-05-03 20:25:42 -07001040 struct flowi4 fl4;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001041
1042 tunnel = netdev_priv(dev);
1043 iph = &tunnel->parms.iph;
1044
1045 if (iph->daddr) {
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001046 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1047 NULL,
David S. Miller78fbfd82011-03-12 00:00:52 -05001048 iph->daddr, iph->saddr,
1049 0, 0,
1050 IPPROTO_IPV6,
1051 RT_TOS(iph->tos),
1052 tunnel->parms.link);
David S. Millerb23dd4f2011-03-02 14:31:35 -08001053
1054 if (!IS_ERR(rt)) {
Changli Gaod8d1f302010-06-10 23:31:35 -07001055 tdev = rt->dst.dev;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001056 ip_rt_put(rt);
1057 }
1058 dev->flags |= IFF_POINTOPOINT;
1059 }
1060
1061 if (!tdev && tunnel->parms.link)
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001062 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001063
1064 if (tdev) {
Tom Herbert14909662014-09-17 12:25:59 -07001065 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1066
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001067 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
Tom Herbert14909662014-09-17 12:25:59 -07001068 dev->mtu = tdev->mtu - t_hlen;
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001069 if (dev->mtu < IPV6_MIN_MTU)
1070 dev->mtu = IPV6_MIN_MTU;
1071 }
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001072}
1073
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001074static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
1075{
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001076 struct net *net = t->net;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001077 struct sit_net *sitn = net_generic(net, sit_net_id);
1078
1079 ipip6_tunnel_unlink(sitn, t);
1080 synchronize_net();
1081 t->parms.iph.saddr = p->iph.saddr;
1082 t->parms.iph.daddr = p->iph.daddr;
1083 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1084 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1085 ipip6_tunnel_link(sitn, t);
1086 t->parms.iph.ttl = p->iph.ttl;
1087 t->parms.iph.tos = p->iph.tos;
1088 if (t->parms.link != p->link) {
1089 t->parms.link = p->link;
1090 ipip6_tunnel_bind_dev(t->dev);
1091 }
Paolo Abenie09acdd2016-02-12 15:43:55 +01001092 dst_cache_reset(&t->dst_cache);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001093 netdev_state_change(t->dev);
1094}
1095
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001096#ifdef CONFIG_IPV6_SIT_6RD
1097static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1098 struct ip_tunnel_6rd *ip6rd)
1099{
1100 struct in6_addr prefix;
1101 __be32 relay_prefix;
1102
1103 if (ip6rd->relay_prefixlen > 32 ||
1104 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1105 return -EINVAL;
1106
1107 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1108 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1109 return -EINVAL;
1110 if (ip6rd->relay_prefixlen)
1111 relay_prefix = ip6rd->relay_prefix &
1112 htonl(0xffffffffUL <<
1113 (32 - ip6rd->relay_prefixlen));
1114 else
1115 relay_prefix = 0;
1116 if (relay_prefix != ip6rd->relay_prefix)
1117 return -EINVAL;
1118
1119 t->ip6rd.prefix = prefix;
1120 t->ip6rd.relay_prefix = relay_prefix;
1121 t->ip6rd.prefixlen = ip6rd->prefixlen;
1122 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
Paolo Abenie09acdd2016-02-12 15:43:55 +01001123 dst_cache_reset(&t->dst_cache);
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001124 netdev_state_change(t->dev);
1125 return 0;
1126}
1127#endif
1128
Simon Horman49dbe7a2016-07-07 07:56:13 +02001129bool ipip6_valid_ip_proto(u8 ipproto)
1130{
1131 return ipproto == IPPROTO_IPV6 ||
1132 ipproto == IPPROTO_IPIP ||
1133#if IS_ENABLED(CONFIG_MPLS)
1134 ipproto == IPPROTO_MPLS ||
1135#endif
1136 ipproto == 0;
1137}
1138
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139static int
Ian Morris67ba4152014-08-24 21:53:10 +01001140ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141{
1142 int err = 0;
1143 struct ip_tunnel_parm p;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001144 struct ip_tunnel_prl prl;
Nicolas Dichtel9aad77c2014-04-16 11:19:33 +02001145 struct ip_tunnel *t = netdev_priv(dev);
1146 struct net *net = t->net;
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001147 struct sit_net *sitn = net_generic(net, sit_net_id);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001148#ifdef CONFIG_IPV6_SIT_6RD
1149 struct ip_tunnel_6rd ip6rd;
1150#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
1152 switch (cmd) {
1153 case SIOCGETTUNNEL:
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001154#ifdef CONFIG_IPV6_SIT_6RD
1155 case SIOCGET6RD:
1156#endif
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001157 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1159 err = -EFAULT;
1160 break;
1161 }
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001162 t = ipip6_tunnel_locate(net, &p, 0);
Ian Morris63159f22015-03-29 14:00:04 +01001163 if (!t)
Nicolas Dichtel9aad77c2014-04-16 11:19:33 +02001164 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 }
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001166
1167 err = -EFAULT;
1168 if (cmd == SIOCGETTUNNEL) {
1169 memcpy(&p, &t->parms, sizeof(p));
1170 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1171 sizeof(p)))
1172 goto done;
1173#ifdef CONFIG_IPV6_SIT_6RD
1174 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001175 ip6rd.prefix = t->ip6rd.prefix;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001176 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1177 ip6rd.prefixlen = t->ip6rd.prefixlen;
1178 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1179 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1180 sizeof(ip6rd)))
1181 goto done;
1182#endif
1183 }
1184 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 break;
1186
1187 case SIOCADDTUNNEL:
1188 case SIOCCHGTUNNEL:
1189 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001190 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 goto done;
1192
1193 err = -EFAULT;
1194 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1195 goto done;
1196
1197 err = -EINVAL;
Simon Horman49dbe7a2016-07-07 07:56:13 +02001198 if (!ipip6_valid_ip_proto(p.iph.protocol))
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001199 goto done;
1200 if (p.iph.version != 4 ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1202 goto done;
1203 if (p.iph.ttl)
1204 p.iph.frag_off |= htons(IP_DF);
1205
Pavel Emelyanovca8def12008-04-16 01:15:39 -07001206 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001208 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Ian Morris53b24b82015-03-29 14:00:05 +01001209 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 if (t->dev != dev) {
1211 err = -EEXIST;
1212 break;
1213 }
1214 } else {
1215 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1216 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1217 err = -EINVAL;
1218 break;
1219 }
Patrick McHardy2941a482006-01-08 22:05:26 -08001220 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 }
Nicolas Dichtelf9cd5a52012-11-14 05:14:04 +00001222
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001223 ipip6_tunnel_update(t, &p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 }
1225
1226 if (t) {
1227 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1229 err = -EFAULT;
1230 } else
1231 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1232 break;
1233
1234 case SIOCDELTUNNEL:
1235 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001236 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 goto done;
1238
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001239 if (dev == sitn->fb_tunnel_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 err = -EFAULT;
1241 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1242 goto done;
1243 err = -ENOENT;
Ian Morrise5d08d72014-11-23 21:28:43 +00001244 t = ipip6_tunnel_locate(net, &p, 0);
Ian Morris63159f22015-03-29 14:00:04 +01001245 if (!t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 goto done;
1247 err = -EPERM;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001248 if (t == netdev_priv(sitn->fb_tunnel_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 goto done;
1250 dev = t->dev;
1251 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001252 unregister_netdevice(dev);
1253 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 break;
1255
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001256 case SIOCGETPRL:
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001257 err = -EINVAL;
1258 if (dev == sitn->fb_tunnel_dev)
1259 goto done;
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001260 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1261 break;
1262
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001263 case SIOCADDPRL:
1264 case SIOCDELPRL:
1265 case SIOCCHGPRL:
1266 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001267 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001268 goto done;
1269 err = -EINVAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001270 if (dev == sitn->fb_tunnel_dev)
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001271 goto done;
1272 err = -EFAULT;
1273 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1274 goto done;
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001275
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001276 switch (cmd) {
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001277 case SIOCDELPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001278 err = ipip6_tunnel_del_prl(t, &prl);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001279 break;
1280 case SIOCADDPRL:
1281 case SIOCCHGPRL:
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001282 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
YOSHIFUJI Hideaki300aaee2008-03-24 18:28:39 +09001283 break;
1284 }
Paolo Abenie09acdd2016-02-12 15:43:55 +01001285 dst_cache_reset(&t->dst_cache);
YOSHIFUJI Hideaki2b4743b2008-06-16 16:48:20 -07001286 netdev_state_change(dev);
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -04001287 break;
1288
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001289#ifdef CONFIG_IPV6_SIT_6RD
1290 case SIOCADD6RD:
1291 case SIOCCHG6RD:
1292 case SIOCDEL6RD:
1293 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001294 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001295 goto done;
1296
1297 err = -EFAULT;
1298 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1299 sizeof(ip6rd)))
1300 goto done;
1301
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001302 if (cmd != SIOCDEL6RD) {
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001303 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1304 if (err < 0)
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001305 goto done;
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001306 } else
YOSHIFUJI Hideaki / 吉藤英明e0c93942009-10-11 03:31:34 +00001307 ipip6_tunnel_clone_6rd(dev, sitn);
YOSHIFUJI Hideaki / 吉藤英明fa857af2009-09-22 23:43:14 +00001308
1309 err = 0;
1310 break;
1311#endif
1312
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 default:
1314 err = -EINVAL;
1315 }
1316
1317done:
1318 return err;
1319}
1320
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1322{
Tom Herbert14909662014-09-17 12:25:59 -07001323 struct ip_tunnel *tunnel = netdev_priv(dev);
1324 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1325
1326 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - t_hlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 return -EINVAL;
1328 dev->mtu = new_mtu;
1329 return 0;
1330}
1331
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001332static const struct net_device_ops ipip6_netdev_ops = {
Steffen Klassertebe084a2014-11-03 09:19:29 +01001333 .ndo_init = ipip6_tunnel_init,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001334 .ndo_uninit = ipip6_tunnel_uninit,
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001335 .ndo_start_xmit = sit_tunnel_xmit,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001336 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1337 .ndo_change_mtu = ipip6_tunnel_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +00001338 .ndo_get_stats64 = ip_tunnel_get_stats64,
Nicolas Dichtel1e995842015-04-02 17:07:02 +02001339 .ndo_get_iflink = ip_tunnel_get_iflink,
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001340};
1341
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001342static void ipip6_dev_free(struct net_device *dev)
1343{
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +01001344 struct ip_tunnel *tunnel = netdev_priv(dev);
1345
Paolo Abenie09acdd2016-02-12 15:43:55 +01001346 dst_cache_destroy(&tunnel->dst_cache);
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001347 free_percpu(dev->tstats);
1348 free_netdev(dev);
1349}
1350
Eric Dumazet61c1db72013-10-20 20:47:30 -07001351#define SIT_FEATURES (NETIF_F_SG | \
1352 NETIF_F_FRAGLIST | \
1353 NETIF_F_HIGHDMA | \
1354 NETIF_F_GSO_SOFTWARE | \
1355 NETIF_F_HW_CSUM)
1356
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357static void ipip6_tunnel_setup(struct net_device *dev)
1358{
Tom Herbert14909662014-09-17 12:25:59 -07001359 struct ip_tunnel *tunnel = netdev_priv(dev);
1360 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1361
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001362 dev->netdev_ops = &ipip6_netdev_ops;
Ian Morris67ba4152014-08-24 21:53:10 +01001363 dev->destructor = ipip6_dev_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364
1365 dev->type = ARPHRD_SIT;
Tom Herbert14909662014-09-17 12:25:59 -07001366 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1367 dev->mtu = ETH_DATA_LEN - t_hlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 dev->flags = IFF_NOARP;
Eric Dumazet02875872014-10-05 18:38:35 -07001369 netif_keep_dst(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 dev->addr_len = 4;
Eric Dumazet8df40d12010-09-28 02:53:41 +00001371 dev->features |= NETIF_F_LLTX;
Eric Dumazet61c1db72013-10-20 20:47:30 -07001372 dev->features |= SIT_FEATURES;
1373 dev->hw_features |= SIT_FEATURES;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374}
1375
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001376static int ipip6_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377{
Stephen Hemminger1326c3d2008-11-20 20:33:56 -08001378 struct ip_tunnel *tunnel = netdev_priv(dev);
Paolo Abenie09acdd2016-02-12 15:43:55 +01001379 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380
1381 tunnel->dev = dev;
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001382 tunnel->net = dev_net(dev);
Steffen Klassertebe084a2014-11-03 09:19:29 +01001383 strcpy(tunnel->parms.name, dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384
Michal Schmidt8a4a50f2007-12-13 09:47:00 -08001385 ipip6_tunnel_bind_dev(dev);
WANG Cong1c213bd2014-02-13 11:46:28 -08001386 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001387 if (!dev->tstats)
1388 return -ENOMEM;
1389
Paolo Abenie09acdd2016-02-12 15:43:55 +01001390 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1391 if (err) {
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +01001392 free_percpu(dev->tstats);
Paolo Abenie09acdd2016-02-12 15:43:55 +01001393 return err;
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +01001394 }
1395
Eric Dumazet15fc1f72010-09-27 00:38:18 +00001396 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397}
1398
Eric Dumazet4ece9002015-11-02 17:08:19 -08001399static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400{
Patrick McHardy2941a482006-01-08 22:05:26 -08001401 struct ip_tunnel *tunnel = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 struct iphdr *iph = &tunnel->parms.iph;
Pavel Emelyanov29182172008-04-16 01:16:38 -07001403 struct net *net = dev_net(dev);
1404 struct sit_net *sitn = net_generic(net, sit_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 iph->version = 4;
1407 iph->protocol = IPPROTO_IPV6;
1408 iph->ihl = 5;
1409 iph->ttl = 64;
1410
1411 dev_hold(dev);
Eric Dumazetcf778b02012-01-12 04:41:32 +00001412 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413}
1414
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001415static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
1416{
1417 u8 proto;
1418
Nicolas Dichtelc2ff6822013-06-19 12:03:13 +02001419 if (!data || !data[IFLA_IPTUN_PROTO])
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001420 return 0;
1421
1422 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
Simon Horman49dbe7a2016-07-07 07:56:13 +02001423 if (!ipip6_valid_ip_proto(proto))
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001424 return -EINVAL;
1425
1426 return 0;
1427}
1428
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001429static void ipip6_netlink_parms(struct nlattr *data[],
1430 struct ip_tunnel_parm *parms)
1431{
1432 memset(parms, 0, sizeof(*parms));
1433
1434 parms->iph.version = 4;
1435 parms->iph.protocol = IPPROTO_IPV6;
1436 parms->iph.ihl = 5;
1437 parms->iph.ttl = 64;
1438
1439 if (!data)
1440 return;
1441
1442 if (data[IFLA_IPTUN_LINK])
1443 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1444
1445 if (data[IFLA_IPTUN_LOCAL])
Nicolas Dichteld440b722012-11-15 04:06:41 +00001446 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001447
1448 if (data[IFLA_IPTUN_REMOTE])
Nicolas Dichteld440b722012-11-15 04:06:41 +00001449 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001450
1451 if (data[IFLA_IPTUN_TTL]) {
1452 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1453 if (parms->iph.ttl)
1454 parms->iph.frag_off = htons(IP_DF);
1455 }
1456
1457 if (data[IFLA_IPTUN_TOS])
1458 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1459
1460 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1461 parms->iph.frag_off = htons(IP_DF);
1462
1463 if (data[IFLA_IPTUN_FLAGS])
Nicolas Dichteld440b722012-11-15 04:06:41 +00001464 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001465
1466 if (data[IFLA_IPTUN_PROTO])
1467 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1468
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001469}
1470
Tom Herbert14909662014-09-17 12:25:59 -07001471/* This function returns true when ENCAP attributes are present in the nl msg */
1472static bool ipip6_netlink_encap_parms(struct nlattr *data[],
1473 struct ip_tunnel_encap *ipencap)
1474{
1475 bool ret = false;
1476
1477 memset(ipencap, 0, sizeof(*ipencap));
1478
1479 if (!data)
1480 return ret;
1481
1482 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1483 ret = true;
1484 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1485 }
1486
1487 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1488 ret = true;
1489 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1490 }
1491
1492 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1493 ret = true;
Eric Dumazeta409cae2015-02-04 15:12:04 -08001494 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
Tom Herbert14909662014-09-17 12:25:59 -07001495 }
1496
1497 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1498 ret = true;
Eric Dumazeta409cae2015-02-04 15:12:04 -08001499 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
Tom Herbert14909662014-09-17 12:25:59 -07001500 }
1501
1502 return ret;
1503}
1504
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001505#ifdef CONFIG_IPV6_SIT_6RD
1506/* This function returns true when 6RD attributes are present in the nl msg */
1507static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1508 struct ip_tunnel_6rd *ip6rd)
1509{
1510 bool ret = false;
1511 memset(ip6rd, 0, sizeof(*ip6rd));
1512
1513 if (!data)
1514 return ret;
1515
1516 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1517 ret = true;
Jiri Benc67b61f62015-03-29 16:59:26 +02001518 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]);
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001519 }
1520
1521 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1522 ret = true;
1523 ip6rd->relay_prefix =
1524 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1525 }
1526
1527 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1528 ret = true;
1529 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1530 }
1531
1532 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1533 ret = true;
1534 ip6rd->relay_prefixlen =
1535 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1536 }
1537
1538 return ret;
1539}
1540#endif
1541
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001542static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1543 struct nlattr *tb[], struct nlattr *data[])
1544{
1545 struct net *net = dev_net(dev);
1546 struct ip_tunnel *nt;
Tom Herbert14909662014-09-17 12:25:59 -07001547 struct ip_tunnel_encap ipencap;
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001548#ifdef CONFIG_IPV6_SIT_6RD
1549 struct ip_tunnel_6rd ip6rd;
1550#endif
1551 int err;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001552
1553 nt = netdev_priv(dev);
Tom Herbert14909662014-09-17 12:25:59 -07001554
1555 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1556 err = ip_tunnel_encap_setup(nt, &ipencap);
1557 if (err < 0)
1558 return err;
1559 }
1560
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001561 ipip6_netlink_parms(data, &nt->parms);
1562
1563 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1564 return -EEXIST;
1565
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001566 err = ipip6_tunnel_create(dev);
1567 if (err < 0)
1568 return err;
1569
1570#ifdef CONFIG_IPV6_SIT_6RD
1571 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1572 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1573#endif
1574
1575 return err;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001576}
1577
1578static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1579 struct nlattr *data[])
1580{
Nicolas Dichtel86bd68b2013-07-03 17:00:34 +02001581 struct ip_tunnel *t = netdev_priv(dev);
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001582 struct ip_tunnel_parm p;
Tom Herbert14909662014-09-17 12:25:59 -07001583 struct ip_tunnel_encap ipencap;
Nicolas Dichtel86bd68b2013-07-03 17:00:34 +02001584 struct net *net = t->net;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001585 struct sit_net *sitn = net_generic(net, sit_net_id);
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001586#ifdef CONFIG_IPV6_SIT_6RD
1587 struct ip_tunnel_6rd ip6rd;
1588#endif
Tom Herbert14909662014-09-17 12:25:59 -07001589 int err;
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001590
1591 if (dev == sitn->fb_tunnel_dev)
1592 return -EINVAL;
1593
Tom Herbert14909662014-09-17 12:25:59 -07001594 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1595 err = ip_tunnel_encap_setup(t, &ipencap);
1596 if (err < 0)
1597 return err;
1598 }
1599
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001600 ipip6_netlink_parms(data, &p);
1601
1602 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1603 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1604 return -EINVAL;
1605
1606 t = ipip6_tunnel_locate(net, &p, 0);
1607
1608 if (t) {
1609 if (t->dev != dev)
1610 return -EEXIST;
1611 } else
1612 t = netdev_priv(dev);
1613
1614 ipip6_tunnel_update(t, &p);
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001615
1616#ifdef CONFIG_IPV6_SIT_6RD
1617 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1618 return ipip6_tunnel_update_6rd(t, &ip6rd);
1619#endif
1620
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001621 return 0;
1622}
1623
Nicolas Dichtele4c94a92012-11-14 05:14:06 +00001624static size_t ipip6_get_size(const struct net_device *dev)
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001625{
1626 return
1627 /* IFLA_IPTUN_LINK */
1628 nla_total_size(4) +
1629 /* IFLA_IPTUN_LOCAL */
1630 nla_total_size(4) +
1631 /* IFLA_IPTUN_REMOTE */
1632 nla_total_size(4) +
1633 /* IFLA_IPTUN_TTL */
1634 nla_total_size(1) +
1635 /* IFLA_IPTUN_TOS */
1636 nla_total_size(1) +
Nicolas Dichtela12c9a82012-11-14 05:14:05 +00001637 /* IFLA_IPTUN_PMTUDISC */
1638 nla_total_size(1) +
1639 /* IFLA_IPTUN_FLAGS */
1640 nla_total_size(2) +
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001641 /* IFLA_IPTUN_PROTO */
1642 nla_total_size(1) +
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001643#ifdef CONFIG_IPV6_SIT_6RD
1644 /* IFLA_IPTUN_6RD_PREFIX */
1645 nla_total_size(sizeof(struct in6_addr)) +
1646 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1647 nla_total_size(4) +
1648 /* IFLA_IPTUN_6RD_PREFIXLEN */
1649 nla_total_size(2) +
1650 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1651 nla_total_size(2) +
1652#endif
Tom Herbert14909662014-09-17 12:25:59 -07001653 /* IFLA_IPTUN_ENCAP_TYPE */
1654 nla_total_size(2) +
1655 /* IFLA_IPTUN_ENCAP_FLAGS */
1656 nla_total_size(2) +
1657 /* IFLA_IPTUN_ENCAP_SPORT */
1658 nla_total_size(2) +
1659 /* IFLA_IPTUN_ENCAP_DPORT */
1660 nla_total_size(2) +
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001661 0;
1662}
1663
Nicolas Dichtele4c94a92012-11-14 05:14:06 +00001664static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001665{
1666 struct ip_tunnel *tunnel = netdev_priv(dev);
1667 struct ip_tunnel_parm *parm = &tunnel->parms;
1668
1669 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
Jiri Benc930345e2015-03-29 16:59:25 +02001670 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1671 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001672 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
Nicolas Dichtela12c9a82012-11-14 05:14:05 +00001673 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1674 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1675 !!(parm->iph.frag_off & htons(IP_DF))) ||
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001676 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
Nicolas Dichteld440b722012-11-15 04:06:41 +00001677 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001678 goto nla_put_failure;
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001679
1680#ifdef CONFIG_IPV6_SIT_6RD
Jiri Benc930345e2015-03-29 16:59:25 +02001681 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX,
1682 &tunnel->ip6rd.prefix) ||
1683 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1684 tunnel->ip6rd.relay_prefix) ||
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001685 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1686 tunnel->ip6rd.prefixlen) ||
1687 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1688 tunnel->ip6rd.relay_prefixlen))
1689 goto nla_put_failure;
1690#endif
1691
Tom Herbert14909662014-09-17 12:25:59 -07001692 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
1693 tunnel->encap.type) ||
Eric Dumazeta409cae2015-02-04 15:12:04 -08001694 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
Tom Herbert14909662014-09-17 12:25:59 -07001695 tunnel->encap.sport) ||
Eric Dumazeta409cae2015-02-04 15:12:04 -08001696 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
Tom Herbert14909662014-09-17 12:25:59 -07001697 tunnel->encap.dport) ||
1698 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
Tom Herberte1b2cb62014-11-05 16:49:38 -08001699 tunnel->encap.flags))
Tom Herbert14909662014-09-17 12:25:59 -07001700 goto nla_put_failure;
1701
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001702 return 0;
1703
1704nla_put_failure:
1705 return -EMSGSIZE;
1706}
1707
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001708static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1709 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1710 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1711 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1712 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1713 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1714 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1715 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001716 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
Nicolas Dichtele2f1f072012-11-19 22:41:45 +00001717#ifdef CONFIG_IPV6_SIT_6RD
1718 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1719 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1720 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1721 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1722#endif
Tom Herbert14909662014-09-17 12:25:59 -07001723 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
1724 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
1725 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
1726 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001727};
1728
Willem de Bruijn94342662013-11-13 21:27:38 -05001729static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1730{
1731 struct net *net = dev_net(dev);
1732 struct sit_net *sitn = net_generic(net, sit_net_id);
1733
1734 if (dev != sitn->fb_tunnel_dev)
1735 unregister_netdevice_queue(dev, head);
1736}
1737
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001738static struct rtnl_link_ops sit_link_ops __read_mostly = {
1739 .kind = "sit",
1740 .maxtype = IFLA_IPTUN_MAX,
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001741 .policy = ipip6_policy,
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001742 .priv_size = sizeof(struct ip_tunnel),
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001743 .setup = ipip6_tunnel_setup,
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001744 .validate = ipip6_validate,
Nicolas Dichtelf3723412012-11-14 05:14:07 +00001745 .newlink = ipip6_newlink,
1746 .changelink = ipip6_changelink,
Nicolas Dichtele4c94a92012-11-14 05:14:06 +00001747 .get_size = ipip6_get_size,
1748 .fill_info = ipip6_fill_info,
Willem de Bruijn94342662013-11-13 21:27:38 -05001749 .dellink = ipip6_dellink,
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01001750 .get_link_net = ip_tunnel_get_link_net,
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001751};
1752
Eric Dumazet6dcd8142010-08-30 07:04:14 +00001753static struct xfrm_tunnel sit_handler __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 .handler = ipip6_rcv,
1755 .err_handler = ipip6_err,
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001756 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757};
1758
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001759static struct xfrm_tunnel ipip_handler __read_mostly = {
1760 .handler = ipip_rcv,
1761 .err_handler = ipip6_err,
1762 .priority = 2,
1763};
1764
Simon Horman49dbe7a2016-07-07 07:56:13 +02001765#if IS_ENABLED(CONFIG_MPLS)
1766static struct xfrm_tunnel mplsip_handler __read_mostly = {
1767 .handler = mplsip_rcv,
1768 .err_handler = ipip6_err,
1769 .priority = 2,
1770};
1771#endif
1772
Willem de Bruijn94342662013-11-13 21:27:38 -05001773static void __net_exit sit_destroy_tunnels(struct net *net,
1774 struct list_head *head)
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001775{
Willem de Bruijn94342662013-11-13 21:27:38 -05001776 struct sit_net *sitn = net_generic(net, sit_net_id);
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001777 struct net_device *dev, *aux;
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001778 int prio;
1779
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001780 for_each_netdev_safe(net, dev, aux)
1781 if (dev->rtnl_link_ops == &sit_link_ops)
1782 unregister_netdevice_queue(dev, head);
1783
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001784 for (prio = 1; prio < 4; prio++) {
1785 int h;
1786 for (h = 0; h < HASH_SIZE; h++) {
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001787 struct ip_tunnel *t;
Eric Dumazet62808f92009-10-28 04:37:43 +00001788
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001789 t = rtnl_dereference(sitn->tunnels[prio][h]);
Ian Morris53b24b82015-03-29 14:00:05 +01001790 while (t) {
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001791 /* If dev is in the same netns, it has already
1792 * been added to the list by the previous loop.
1793 */
Nicolas Dichtelfc8f9992013-08-13 17:51:10 +02001794 if (!net_eq(dev_net(t->dev), net))
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001795 unregister_netdevice_queue(t->dev,
1796 head);
Eric Dumazet753ea8e2011-01-20 07:16:24 +00001797 t = rtnl_dereference(t->next);
Eric Dumazet62808f92009-10-28 04:37:43 +00001798 }
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001799 }
1800 }
1801}
1802
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001803static int __net_init sit_init_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001804{
Eric W. Biederman67101172009-11-29 15:46:16 +00001805 struct sit_net *sitn = net_generic(net, sit_net_id);
Ted Feng72b36012011-12-08 00:46:21 +00001806 struct ip_tunnel *t;
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001807 int err;
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001808
Pavel Emelyanov29182172008-04-16 01:16:38 -07001809 sitn->tunnels[0] = sitn->tunnels_wc;
1810 sitn->tunnels[1] = sitn->tunnels_l;
1811 sitn->tunnels[2] = sitn->tunnels_r;
1812 sitn->tunnels[3] = sitn->tunnels_r_l;
1813
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001814 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
Tom Gundersenc835a672014-07-14 16:37:24 +02001815 NET_NAME_UNKNOWN,
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001816 ipip6_tunnel_setup);
1817 if (!sitn->fb_tunnel_dev) {
1818 err = -ENOMEM;
1819 goto err_alloc_dev;
1820 }
Alexey Dobriyanbe77e592008-11-23 17:26:26 -08001821 dev_net_set(sitn->fb_tunnel_dev, net);
Nicolas Dichtel205983c2013-10-01 18:04:59 +02001822 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001823 /* FB netdevice is special: we have one, and only one per netns.
1824 * Allowing to move it to another netns is clearly unsafe.
1825 */
1826 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001827
Ian Morrise5d08d72014-11-23 21:28:43 +00001828 err = register_netdev(sitn->fb_tunnel_dev);
1829 if (err)
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001830 goto err_reg_dev;
1831
Eric Dumazet4ece9002015-11-02 17:08:19 -08001832 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1833 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1834
Ted Feng72b36012011-12-08 00:46:21 +00001835 t = netdev_priv(sitn->fb_tunnel_dev);
1836
1837 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001838 return 0;
1839
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001840err_reg_dev:
Eric Dumazetdd4080e2010-09-28 02:17:58 +00001841 ipip6_dev_free(sitn->fb_tunnel_dev);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001842err_alloc_dev:
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001843 return err;
1844}
1845
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001846static void __net_exit sit_exit_net(struct net *net)
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001847{
Eric Dumazet62808f92009-10-28 04:37:43 +00001848 LIST_HEAD(list);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001849
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001850 rtnl_lock();
Willem de Bruijn94342662013-11-13 21:27:38 -05001851 sit_destroy_tunnels(net, &list);
Eric Dumazet62808f92009-10-28 04:37:43 +00001852 unregister_netdevice_many(&list);
Pavel Emelyanovcd3dbc12008-04-16 01:16:18 -07001853 rtnl_unlock();
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001854}
1855
1856static struct pernet_operations sit_net_ops = {
1857 .init = sit_init_net,
1858 .exit = sit_exit_net,
Eric W. Biederman67101172009-11-29 15:46:16 +00001859 .id = &sit_net_id,
1860 .size = sizeof(struct sit_net),
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001861};
1862
Adrian Bunk89c89452006-11-20 16:56:48 -08001863static void __exit sit_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864{
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001865 rtnl_link_unregister(&sit_link_ops);
Kazunori MIYAZAWAc73cb5a2007-02-13 12:55:25 -08001866 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001867 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
Simon Horman49dbe7a2016-07-07 07:56:13 +02001868#if IS_ENABLED(CONFIG_MPLS)
1869 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
1870#endif
Alexey Kuznetsovdb445752005-07-30 17:46:44 -07001871
Eric W. Biederman67101172009-11-29 15:46:16 +00001872 unregister_pernet_device(&sit_net_ops);
Eric Dumazetef9a9d12009-10-23 17:51:26 +00001873 rcu_barrier(); /* Wait for completion of call_rcu()'s */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874}
1875
Adrian Bunk89c89452006-11-20 16:56:48 -08001876static int __init sit_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877{
1878 int err;
1879
Simon Horman49dbe7a2016-07-07 07:56:13 +02001880 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881
Eric W. Biederman67101172009-11-29 15:46:16 +00001882 err = register_pernet_device(&sit_net_ops);
Pavel Emelyanov8190d902008-04-16 01:15:17 -07001883 if (err < 0)
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001884 return err;
1885 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1886 if (err < 0) {
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001887 pr_info("%s: can't register ip6ip4\n", __func__);
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001888 goto xfrm_tunnel_failed;
Alexey Dobriyand5aa4072010-02-16 09:05:04 +00001889 }
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001890 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1891 if (err < 0) {
1892 pr_info("%s: can't register ip4ip4\n", __func__);
1893 goto xfrm_tunnel4_failed;
1894 }
Simon Horman49dbe7a2016-07-07 07:56:13 +02001895#if IS_ENABLED(CONFIG_MPLS)
1896 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
1897 if (err < 0) {
1898 pr_info("%s: can't register mplsip\n", __func__);
1899 goto xfrm_tunnel_mpls_failed;
1900 }
1901#endif
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:
Simon Horman49dbe7a2016-07-07 07:56:13 +02001910#if IS_ENABLED(CONFIG_MPLS)
1911 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
1912xfrm_tunnel_mpls_failed:
1913#endif
Nicolas Dichtel32b8a8e2013-05-27 23:48:16 +00001914 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1915xfrm_tunnel4_failed:
Nicolas Dichtelba3e3f52012-11-09 06:10:00 +00001916 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1917xfrm_tunnel_failed:
1918 unregister_pernet_device(&sit_net_ops);
1919 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920}
Joerg Roedel989e5b92006-10-10 14:47:44 -07001921
1922module_init(sit_init);
1923module_exit(sit_cleanup);
Jan Dittmer39c85082006-10-13 15:05:53 -07001924MODULE_LICENSE("GPL");
Tom Gundersenf98f89a2014-05-15 23:21:30 +02001925MODULE_ALIAS_RTNL_LINK("sit");
Vasiliy Kulikov8909c9a2011-03-02 00:33:13 +03001926MODULE_ALIAS_NETDEV("sit0");