blob: 17c7b098cdb0cc61021db7d080e0414536c48d3c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09002 * IPv6 tunneling device
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Linux INET6 implementation
4 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Ville Nuorvala <vnuorval@tcs.hut.fi>
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09007 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Based on:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090010 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 * RFC 2473
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/module.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080022#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/sockios.h>
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090026#include <linux/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/if.h>
28#include <linux/in.h>
29#include <linux/ip.h>
30#include <linux/if_tunnel.h>
31#include <linux/net.h>
32#include <linux/in6.h>
33#include <linux/netdevice.h>
34#include <linux/if_arp.h>
35#include <linux/icmpv6.h>
36#include <linux/init.h>
37#include <linux/route.h>
38#include <linux/rtnetlink.h>
39#include <linux/netfilter_ipv6.h>
40
41#include <asm/uaccess.h>
42#include <asm/atomic.h>
43
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090044#include <net/icmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <net/ip.h>
46#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <net/ip6_route.h>
48#include <net/addrconf.h>
49#include <net/ip6_tunnel.h>
50#include <net/xfrm.h>
51#include <net/dsfield.h>
52#include <net/inet_ecn.h>
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070053#include <net/net_namespace.h>
54#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56MODULE_AUTHOR("Ville Nuorvala");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090057MODULE_DESCRIPTION("IPv6 tunneling device");
Linus Torvalds1da177e2005-04-16 15:20:36 -070058MODULE_LICENSE("GPL");
59
60#define IPV6_TLV_TEL_DST_SIZE 8
61
62#ifdef IP6_TNL_DEBUG
Harvey Harrison0dc47872008-03-05 20:47:47 -080063#define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#else
65#define IP6_TNL_TRACE(x...) do {;} while(0)
66#endif
67
68#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +090069#define IPV6_TCLASS_SHIFT 20
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71#define HASH_SIZE 32
72
Al Viroe69a4adc2006-11-14 20:56:00 -080073#define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090074 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
75 (HASH_SIZE - 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Yasuyuki Kozakai31445812007-02-10 00:30:33 +090077static int ip6_fb_tnl_dev_init(struct net_device *dev);
78static int ip6_tnl_dev_init(struct net_device *dev);
79static void ip6_tnl_dev_setup(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070081static int ip6_tnl_net_id;
82struct ip6_tnl_net {
Pavel Emelyanov15820e1292008-04-16 01:23:02 -070083 /* the IPv6 tunnel fallback device */
84 struct net_device *fb_tnl_dev;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -070085 /* lists for storing tunnels in use */
86 struct ip6_tnl *tnls_r_l[HASH_SIZE];
87 struct ip6_tnl *tnls_wc[1];
88 struct ip6_tnl **tnls[2];
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -070089};
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091/* lock for the tunnel lists */
Yasuyuki Kozakai31445812007-02-10 00:30:33 +090092static DEFINE_RWLOCK(ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
95{
96 struct dst_entry *dst = t->dst_cache;
97
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090098 if (dst && dst->obsolete &&
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 dst->ops->check(dst, t->dst_cookie) == NULL) {
100 t->dst_cache = NULL;
101 dst_release(dst);
102 return NULL;
103 }
104
105 return dst;
106}
107
108static inline void ip6_tnl_dst_reset(struct ip6_tnl *t)
109{
110 dst_release(t->dst_cache);
111 t->dst_cache = NULL;
112}
113
114static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
115{
116 struct rt6_info *rt = (struct rt6_info *) dst;
117 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
118 dst_release(t->dst_cache);
119 t->dst_cache = dst;
120}
121
122/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900123 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900124 * @remote: the address of the tunnel exit-point
125 * @local: the address of the tunnel entry-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900127 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 * tunnel matching given end-points if found,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900129 * else fallback tunnel if its device is up,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 * else %NULL
131 **/
132
133static struct ip6_tnl *
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700134ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
136 unsigned h0 = HASH(remote);
137 unsigned h1 = HASH(local);
138 struct ip6_tnl *t;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700139 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700141 for (t = ip6n->tnls_r_l[h0 ^ h1]; t; t = t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 if (ipv6_addr_equal(local, &t->parms.laddr) &&
143 ipv6_addr_equal(remote, &t->parms.raddr) &&
144 (t->dev->flags & IFF_UP))
145 return t;
146 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700147 if ((t = ip6n->tnls_wc[0]) != NULL && (t->dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 return t;
149
150 return NULL;
151}
152
153/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900154 * ip6_tnl_bucket - get head of list matching given tunnel parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900155 * @p: parameters containing tunnel end-points
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 *
157 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900158 * ip6_tnl_bucket() returns the head of the list matching the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 * &struct in6_addr entries laddr and raddr in @p.
160 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900161 * Return: head of IPv6 tunnel list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 **/
163
164static struct ip6_tnl **
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700165ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
167 struct in6_addr *remote = &p->raddr;
168 struct in6_addr *local = &p->laddr;
169 unsigned h = 0;
170 int prio = 0;
171
172 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
173 prio = 1;
174 h = HASH(remote) ^ HASH(local);
175 }
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700176 return &ip6n->tnls[prio][h];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
178
179/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900180 * ip6_tnl_link - add tunnel to hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 * @t: tunnel to be added
182 **/
183
184static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700185ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186{
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700187 struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
189 t->next = *tp;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900190 write_lock_bh(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 *tp = t;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900192 write_unlock_bh(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
195/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900196 * ip6_tnl_unlink - remove tunnel from hash table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 * @t: tunnel to be removed
198 **/
199
200static void
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700201ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
203 struct ip6_tnl **tp;
204
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700205 for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (t == *tp) {
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900207 write_lock_bh(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 *tp = t->next;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900209 write_unlock_bh(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 break;
211 }
212 }
213}
214
215/**
216 * ip6_tnl_create() - create a new tunnel
217 * @p: tunnel parameters
218 * @pt: pointer to new tunnel
219 *
220 * Description:
221 * Create tunnel matching given parameters.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900222 *
223 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800224 * created tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 **/
226
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700227static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
229 struct net_device *dev;
230 struct ip6_tnl *t;
231 char name[IFNAMSIZ];
232 int err;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700233 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800235 if (p->name[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 strlcpy(name, p->name, IFNAMSIZ);
Pavel Emelyanov34cc7ba2008-02-23 20:19:20 -0800237 else
238 sprintf(name, "ip6tnl%%d");
239
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900240 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 if (dev == NULL)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800242 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
Pavel Emelyanov554eb272008-04-16 01:24:13 -0700244 dev_net_set(dev, net);
245
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800246 if (strchr(name, '%')) {
247 if (dev_alloc_name(dev, name) < 0)
248 goto failed_free;
249 }
250
Patrick McHardy2941a482006-01-08 22:05:26 -0800251 t = netdev_priv(dev);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900252 dev->init = ip6_tnl_dev_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 t->parms = *p;
254
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800255 if ((err = register_netdevice(dev)) < 0)
256 goto failed_free;
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 dev_hold(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700259 ip6_tnl_link(ip6n, t);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800260 return t;
Pavel Emelyanovb37d428b2008-02-26 23:51:04 -0800261
262failed_free:
263 free_netdev(dev);
Ville Nuorvala567131a2006-11-24 17:05:41 -0800264failed:
265 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
267
268/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900269 * ip6_tnl_locate - find or create tunnel matching given parameters
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900270 * @p: tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 * @create: != 0 if allowed to create new tunnel if no match found
272 *
273 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900274 * ip6_tnl_locate() first tries to locate an existing tunnel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 * based on @parms. If this is unsuccessful, but @create is set a new
276 * tunnel device is created and registered for use.
277 *
278 * Return:
Ville Nuorvala567131a2006-11-24 17:05:41 -0800279 * matching tunnel or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 **/
281
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700282static struct ip6_tnl *ip6_tnl_locate(struct net *net,
283 struct ip6_tnl_parm *p, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
285 struct in6_addr *remote = &p->raddr;
286 struct in6_addr *local = &p->laddr;
287 struct ip6_tnl *t;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700288 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700290 for (t = *ip6_tnl_bucket(ip6n, p); t; t = t->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Ville Nuorvala567131a2006-11-24 17:05:41 -0800292 ipv6_addr_equal(remote, &t->parms.raddr))
293 return t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 }
295 if (!create)
Ville Nuorvala567131a2006-11-24 17:05:41 -0800296 return NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700297 return ip6_tnl_create(net, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
300/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900301 * ip6_tnl_dev_uninit - tunnel device uninitializer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 * @dev: the device to be destroyed
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900303 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900305 * ip6_tnl_dev_uninit() removes tunnel from its list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 **/
307
308static void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900309ip6_tnl_dev_uninit(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310{
Patrick McHardy2941a482006-01-08 22:05:26 -0800311 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700312 struct net *net = dev_net(dev);
313 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Pavel Emelyanov15820e1292008-04-16 01:23:02 -0700315 if (dev == ip6n->fb_tnl_dev) {
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900316 write_lock_bh(&ip6_tnl_lock);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -0700317 ip6n->tnls_wc[0] = NULL;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900318 write_unlock_bh(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 } else {
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700320 ip6_tnl_unlink(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 }
322 ip6_tnl_dst_reset(t);
323 dev_put(dev);
324}
325
326/**
327 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
328 * @skb: received socket buffer
329 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900330 * Return:
331 * 0 if none was found,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 * else index to encapsulation limit
333 **/
334
335static __u16
336parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
337{
338 struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw;
339 __u8 nexthdr = ipv6h->nexthdr;
340 __u16 off = sizeof (*ipv6h);
341
342 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
343 __u16 optlen = 0;
344 struct ipv6_opt_hdr *hdr;
345 if (raw + off + sizeof (*hdr) > skb->data &&
346 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
347 break;
348
349 hdr = (struct ipv6_opt_hdr *) (raw + off);
350 if (nexthdr == NEXTHDR_FRAGMENT) {
351 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
352 if (frag_hdr->frag_off)
353 break;
354 optlen = 8;
355 } else if (nexthdr == NEXTHDR_AUTH) {
356 optlen = (hdr->hdrlen + 2) << 2;
357 } else {
358 optlen = ipv6_optlen(hdr);
359 }
360 if (nexthdr == NEXTHDR_DEST) {
361 __u16 i = off + 2;
362 while (1) {
363 struct ipv6_tlv_tnl_enc_lim *tel;
364
365 /* No more room for encapsulation limit */
366 if (i + sizeof (*tel) > off + optlen)
367 break;
368
369 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
370 /* return index of option if found and valid */
371 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
372 tel->length == 1)
373 return i;
374 /* else jump to next option */
375 if (tel->type)
376 i += tel->length + 2;
377 else
378 i++;
379 }
380 }
381 nexthdr = hdr->nexthdr;
382 off += optlen;
383 }
384 return 0;
385}
386
387/**
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900388 * ip6_tnl_err - tunnel error handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 *
390 * Description:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900391 * ip6_tnl_err() should handle errors in the tunnel according
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 * to the specifications in RFC 2473.
393 **/
394
Herbert Xud2acc342006-03-28 01:12:13 -0800395static int
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900396ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
Al Viro704eae12007-07-26 17:33:29 +0100397 int *type, int *code, int *msg, __u32 *info, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398{
399 struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data;
400 struct ip6_tnl *t;
401 int rel_msg = 0;
402 int rel_type = ICMPV6_DEST_UNREACH;
403 int rel_code = ICMPV6_ADDR_UNREACH;
404 __u32 rel_info = 0;
405 __u16 len;
Herbert Xud2acc342006-03-28 01:12:13 -0800406 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900408 /* If the packet doesn't contain the original IPv6 header we are
409 in trouble since we might need the source address for further
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 processing of the error. */
411
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900412 read_lock(&ip6_tnl_lock);
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700413 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700414 &ipv6h->saddr)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 goto out;
416
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900417 if (t->parms.proto != ipproto && t->parms.proto != 0)
418 goto out;
419
Herbert Xud2acc342006-03-28 01:12:13 -0800420 err = 0;
421
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900422 switch (*type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 __u32 teli;
424 struct ipv6_tlv_tnl_enc_lim *tel;
425 __u32 mtu;
426 case ICMPV6_DEST_UNREACH:
427 if (net_ratelimit())
428 printk(KERN_WARNING
429 "%s: Path to destination invalid "
430 "or inactive!\n", t->parms.name);
431 rel_msg = 1;
432 break;
433 case ICMPV6_TIME_EXCEED:
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900434 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 if (net_ratelimit())
436 printk(KERN_WARNING
437 "%s: Too small hop limit or "
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900438 "routing loop in tunnel!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 t->parms.name);
440 rel_msg = 1;
441 }
442 break;
443 case ICMPV6_PARAMPROB:
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800444 teli = 0;
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900445 if ((*code) == ICMPV6_HDR_FIELD)
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800446 teli = parse_tlv_tnl_enc_lim(skb, skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Al Viro704eae12007-07-26 17:33:29 +0100448 if (teli && teli == *info - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
450 if (tel->encap_limit == 0) {
451 if (net_ratelimit())
452 printk(KERN_WARNING
453 "%s: Too small encapsulation "
454 "limit or routing loop in "
455 "tunnel!\n", t->parms.name);
456 rel_msg = 1;
457 }
Ville Nuorvala107a5fe2006-11-24 17:08:58 -0800458 } else if (net_ratelimit()) {
459 printk(KERN_WARNING
460 "%s: Recipient unable to parse tunneled "
461 "packet!\n ", t->parms.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 }
463 break;
464 case ICMPV6_PKT_TOOBIG:
Al Viro704eae12007-07-26 17:33:29 +0100465 mtu = *info - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 if (mtu < IPV6_MIN_MTU)
467 mtu = IPV6_MIN_MTU;
468 t->dev->mtu = mtu;
469
Al Virocc6cdac2006-02-18 16:02:18 -0500470 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 rel_type = ICMPV6_PKT_TOOBIG;
472 rel_code = 0;
473 rel_info = mtu;
474 rel_msg = 1;
475 }
476 break;
477 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900478
479 *type = rel_type;
480 *code = rel_code;
481 *info = rel_info;
482 *msg = rel_msg;
483
484out:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900485 read_unlock(&ip6_tnl_lock);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900486 return err;
487}
488
489static int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900490ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro704eae12007-07-26 17:33:29 +0100491 int type, int code, int offset, __be32 info)
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900492{
493 int rel_msg = 0;
494 int rel_type = type;
495 int rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100496 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900497 int err;
498 struct sk_buff *skb2;
499 struct iphdr *eiph;
500 struct flowi fl;
501 struct rtable *rt;
502
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900503 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
504 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900505 if (err < 0)
506 return err;
507
508 if (rel_msg == 0)
509 return 0;
510
511 switch (rel_type) {
512 case ICMPV6_DEST_UNREACH:
513 if (rel_code != ICMPV6_ADDR_UNREACH)
514 return 0;
515 rel_type = ICMP_DEST_UNREACH;
516 rel_code = ICMP_HOST_UNREACH;
517 break;
518 case ICMPV6_PKT_TOOBIG:
519 if (rel_code != 0)
520 return 0;
521 rel_type = ICMP_DEST_UNREACH;
522 rel_code = ICMP_FRAG_NEEDED;
523 break;
524 default:
525 return 0;
526 }
527
528 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
529 return 0;
530
531 skb2 = skb_clone(skb, GFP_ATOMIC);
532 if (!skb2)
533 return 0;
534
535 dst_release(skb2->dst);
536 skb2->dst = NULL;
537 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700538 skb_reset_network_header(skb2);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700539 eiph = ip_hdr(skb2);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900540
541 /* Try to guess incoming interface */
542 memset(&fl, 0, sizeof(fl));
543 fl.fl4_dst = eiph->saddr;
544 fl.fl4_tos = RT_TOS(eiph->tos);
545 fl.proto = IPPROTO_IPIP;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700546 if (ip_route_output_key(dev_net(skb->dev), &rt, &fl))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900547 goto out;
548
549 skb2->dev = rt->u.dst.dev;
550
551 /* route "incoming" packet */
552 if (rt->rt_flags & RTCF_LOCAL) {
553 ip_rt_put(rt);
554 rt = NULL;
555 fl.fl4_dst = eiph->daddr;
556 fl.fl4_src = eiph->saddr;
557 fl.fl4_tos = eiph->tos;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700558 if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) ||
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900559 rt->u.dst.dev->type != ARPHRD_TUNNEL) {
560 ip_rt_put(rt);
561 goto out;
562 }
Denis V. Lunev9937ded2008-02-18 20:49:36 -0800563 skb2->dst = (struct dst_entry *)rt;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900564 } else {
565 ip_rt_put(rt);
566 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
567 skb2->dev) ||
568 skb2->dst->dev->type != ARPHRD_TUNNEL)
569 goto out;
570 }
571
572 /* change mtu on this route */
573 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
574 if (rel_info > dst_mtu(skb2->dst))
575 goto out;
576
577 skb2->dst->ops->update_pmtu(skb2->dst, rel_info);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900578 }
579
Al Viro704eae12007-07-26 17:33:29 +0100580 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900581
582out:
583 kfree_skb(skb2);
584 return 0;
585}
586
587static int
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900588ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro704eae12007-07-26 17:33:29 +0100589 int type, int code, int offset, __be32 info)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900590{
591 int rel_msg = 0;
592 int rel_type = type;
593 int rel_code = code;
Al Viro704eae12007-07-26 17:33:29 +0100594 __u32 rel_info = ntohl(info);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900595 int err;
596
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900597 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
598 &rel_msg, &rel_info, offset);
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900599 if (err < 0)
600 return err;
601
602 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 struct rt6_info *rt;
604 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Ville Nuorvala305d4b32006-11-24 17:06:53 -0800605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 if (!skb2)
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900607 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
609 dst_release(skb2->dst);
610 skb2->dst = NULL;
611 skb_pull(skb2, offset);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700612 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
614 /* Try to guess incoming interface */
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700615 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
616 NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
618 if (rt && rt->rt6i_dev)
619 skb2->dev = rt->rt6i_dev;
620
621 icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
622
623 if (rt)
624 dst_release(&rt->u.dst);
625
626 kfree_skb(skb2);
627 }
Yasuyuki Kozakaie490d1d2006-10-31 23:11:25 +0900628
629 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630}
631
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900632static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
633 struct ipv6hdr *ipv6h,
634 struct sk_buff *skb)
635{
636 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
637
638 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700639 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900640
641 if (INET_ECN_is_ce(dsfield))
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700642 IP_ECN_set_ce(ip_hdr(skb));
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900643}
644
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900645static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
646 struct ipv6hdr *ipv6h,
647 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648{
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900649 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
Herbert Xu29bb43b42007-11-13 21:40:13 -0800650 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900652 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700653 IP6_ECN_set_ce(ipv6_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654}
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900655
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800656static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
657{
658 struct ip6_tnl_parm *p = &t->parms;
659 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700660 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800661
662 if (p->flags & IP6_TNL_F_CAP_RCV) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900663 struct net_device *ldev = NULL;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800664
665 if (p->link)
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700666 ldev = dev_get_by_index(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800667
668 if ((ipv6_addr_is_multicast(&p->laddr) ||
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700669 likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
670 likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800671 ret = 1;
672
673 if (ldev)
674 dev_put(ldev);
675 }
676 return ret;
677}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
679/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900680 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 * @skb: received socket buffer
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900682 * @protocol: ethernet protocol ID
683 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 *
685 * Return: 0
686 **/
687
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900688static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900689 __u8 ipproto,
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900690 void (*dscp_ecn_decapsulate)(struct ip6_tnl *t,
691 struct ipv6hdr *ipv6h,
692 struct sk_buff *skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 struct ip6_tnl *t;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700695 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900697 read_lock(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
Pavel Emelyanov8704ca7e2008-04-16 01:22:43 -0700699 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -0700700 &ipv6h->daddr)) != NULL) {
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900701 if (t->parms.proto != ipproto && t->parms.proto != 0) {
702 read_unlock(&ip6_tnl_lock);
703 goto discard;
704 }
705
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900707 read_unlock(&ip6_tnl_lock);
Herbert Xu50fba2a2006-04-04 13:50:45 -0700708 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 }
710
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800711 if (!ip6_tnl_rcv_ctl(t)) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700712 t->dev->stats.rx_dropped++;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900713 read_unlock(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 goto discard;
715 }
716 secpath_reset(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700717 skb->mac_header = skb->network_header;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700718 skb_reset_network_header(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900719 skb->protocol = htons(protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 skb->pkt_type = PACKET_HOST;
721 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
722 skb->dev = t->dev;
723 dst_release(skb->dst);
724 skb->dst = NULL;
Yasuyuki Kozakai53ab61c2006-11-06 10:06:23 -0800725 nf_reset(skb);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900726
727 dscp_ecn_decapsulate(t, ipv6h, skb);
728
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700729 t->dev->stats.rx_packets++;
730 t->dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 netif_rx(skb);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900732 read_unlock(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 return 0;
734 }
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900735 read_unlock(&ip6_tnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 return 1;
Herbert Xu50fba2a2006-04-04 13:50:45 -0700737
738discard:
739 kfree_skb(skb);
740 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741}
742
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900743static int ip4ip6_rcv(struct sk_buff *skb)
744{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900745 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
746 ip4ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900747}
748
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900749static int ip6ip6_rcv(struct sk_buff *skb)
750{
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900751 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
752 ip6ip6_dscp_ecn_decapsulate);
Yasuyuki Kozakai83599252006-11-03 09:39:14 +0900753}
754
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800755struct ipv6_tel_txoption {
756 struct ipv6_txoptions ops;
757 __u8 dst_opt[8];
758};
759
760static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800762 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800764 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
765 opt->dst_opt[3] = 1;
766 opt->dst_opt[4] = encap_limit;
767 opt->dst_opt[5] = IPV6_TLV_PADN;
768 opt->dst_opt[6] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800770 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
771 opt->ops.opt_nflen = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772}
773
774/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900775 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 * @t: the outgoing tunnel device
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900777 * @hdr: IPv6 header from the incoming packet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 *
779 * Description:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900780 * Avoid trivial tunneling loop by checking that tunnel exit-point
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 * doesn't match source of incoming packet.
782 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900783 * Return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 * 1 if conflict,
785 * 0 else
786 **/
787
788static inline int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +0900789ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790{
791 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
792}
793
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800794static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
795{
796 struct ip6_tnl_parm *p = &t->parms;
797 int ret = 0;
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700798 struct net *net = dev_net(t->dev);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800799
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900800 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800801 struct net_device *ldev = NULL;
802
803 if (p->link)
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700804 ldev = dev_get_by_index(net, p->link);
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800805
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700806 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800807 printk(KERN_WARNING
808 "%s xmit: Local address not yet configured!\n",
809 p->name);
810 else if (!ipv6_addr_is_multicast(&p->raddr) &&
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700811 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -0800812 printk(KERN_WARNING
813 "%s xmit: Routing loop! "
814 "Remote address found on this node!\n",
815 p->name);
816 else
817 ret = 1;
818 if (ldev)
819 dev_put(ldev);
820 }
821 return ret;
822}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823/**
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900824 * ip6_tnl_xmit2 - encapsulate packet and send
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 * @skb: the outgoing socket buffer
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900826 * @dev: the outgoing tunnel device
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900827 * @dsfield: dscp code for outer header
828 * @fl: flow of tunneled packet
829 * @encap_limit: encapsulation limit
830 * @pmtu: Path MTU is stored if packet is too big
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 *
832 * Description:
833 * Build new header and do some sanity checks on the packet before sending
834 * it.
835 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900836 * Return:
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900837 * 0 on success
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900838 * -1 fail
839 * %-EMSGSIZE message too big. return mtu in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 **/
841
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900842static int ip6_tnl_xmit2(struct sk_buff *skb,
843 struct net_device *dev,
844 __u8 dsfield,
845 struct flowi *fl,
846 int encap_limit,
847 __u32 *pmtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848{
Patrick McHardy2941a482006-01-08 22:05:26 -0800849 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -0700850 struct net_device_stats *stats = &t->dev->stats;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700851 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800852 struct ipv6_tel_txoption opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 struct dst_entry *dst;
854 struct net_device *tdev;
855 int mtu;
Chuck Leverc2636b42007-10-23 21:07:32 -0700856 unsigned int max_headroom = sizeof(struct ipv6hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 u8 proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900858 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 int pkt_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 if ((dst = ip6_tnl_dst_check(t)) != NULL)
862 dst_hold(dst);
Patrick McHardya57ebc92005-09-08 14:27:47 -0700863 else {
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -0700864 dst = ip6_route_output(dev_net(dev), NULL, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900866 if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0)
Patrick McHardya57ebc92005-09-08 14:27:47 -0700867 goto tx_err_link_failure;
868 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
870 tdev = dst->dev;
871
872 if (tdev == dev) {
873 stats->collisions++;
874 if (net_ratelimit())
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900875 printk(KERN_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 "%s: Local routing loop detected!\n",
877 t->parms.name);
878 goto tx_err_dst_release;
879 }
880 mtu = dst_mtu(dst) - sizeof (*ipv6h);
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800881 if (encap_limit >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 max_headroom += 8;
883 mtu -= 8;
884 }
885 if (mtu < IPV6_MIN_MTU)
886 mtu = IPV6_MIN_MTU;
Yasuyuki Kozakai26892052006-09-10 03:59:17 +0900887 if (skb->dst)
888 skb->dst->ops->update_pmtu(skb->dst, mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 if (skb->len > mtu) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900890 *pmtu = mtu;
891 err = -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 goto tx_err_dst_release;
893 }
894
895 /*
896 * Okay, now see if we can stuff it in the buffer as-is.
897 */
898 max_headroom += LL_RESERVED_SPACE(tdev);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900899
Patrick McHardycfbba492007-07-09 15:33:40 -0700900 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
901 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 struct sk_buff *new_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900903
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
905 goto tx_err_dst_release;
906
907 if (skb->sk)
908 skb_set_owner_w(new_skb, skb->sk);
909 kfree_skb(skb);
910 skb = new_skb;
911 }
912 dst_release(skb->dst);
913 skb->dst = dst_clone(dst);
914
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700915 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900917 proto = fl->proto;
Ville Nuorvala6fb32dd2006-11-24 17:08:32 -0800918 if (encap_limit >= 0) {
919 init_tel_txopt(&opt, encap_limit);
920 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
921 }
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700922 skb_push(skb, sizeof(struct ipv6hdr));
923 skb_reset_network_header(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700924 ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900925 *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 dsfield = INET_ECN_encapsulate(0, dsfield);
927 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 ipv6h->hop_limit = t->parms.hop_limit;
929 ipv6h->nexthdr = proto;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900930 ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src);
931 ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 nf_reset(skb);
933 pkt_len = skb->len;
Herbert Xuef76bc22008-01-11 19:15:08 -0800934 err = ip6_local_out(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200936 if (net_xmit_eval(err) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 stats->tx_bytes += pkt_len;
938 stats->tx_packets++;
939 } else {
940 stats->tx_errors++;
941 stats->tx_aborted_errors++;
942 }
943 ip6_tnl_dst_store(t, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 return 0;
945tx_err_link_failure:
946 stats->tx_carrier_errors++;
947 dst_link_failure(skb);
948tx_err_dst_release:
949 dst_release(dst);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900950 return err;
951}
952
953static inline int
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900954ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
955{
956 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700957 struct iphdr *iph = ip_hdr(skb);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900958 int encap_limit = -1;
959 struct flowi fl;
960 __u8 dsfield;
961 __u32 mtu;
962 int err;
963
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +0900964 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
965 !ip6_tnl_xmit_ctl(t))
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900966 return -1;
967
968 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
969 encap_limit = t->parms.encap_limit;
970
971 memcpy(&fl, &t->fl, sizeof (fl));
972 fl.proto = IPPROTO_IPIP;
973
974 dsfield = ipv4_get_dsfield(iph);
975
976 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
Al Virob77f2fa2007-07-21 19:09:41 -0700977 fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
978 & IPV6_TCLASS_MASK;
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +0900979
980 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
981 if (err != 0) {
982 /* XXX: send ICMP error even if DF is not set. */
983 if (err == -EMSGSIZE)
984 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
985 htonl(mtu));
986 return -1;
987 }
988
989 return 0;
990}
991
992static inline int
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900993ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
994{
995 struct ip6_tnl *t = netdev_priv(dev);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700996 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +0900997 int encap_limit = -1;
998 __u16 offset;
999 struct flowi fl;
1000 __u8 dsfield;
1001 __u32 mtu;
1002 int err;
1003
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001004 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1005 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001006 return -1;
1007
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001008 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
1009 if (offset > 0) {
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001010 struct ipv6_tlv_tnl_enc_lim *tel;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001011 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001012 if (tel->encap_limit == 0) {
1013 icmpv6_send(skb, ICMPV6_PARAMPROB,
1014 ICMPV6_HDR_FIELD, offset + 2, skb->dev);
1015 return -1;
1016 }
1017 encap_limit = tel->encap_limit - 1;
1018 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1019 encap_limit = t->parms.encap_limit;
1020
1021 memcpy(&fl, &t->fl, sizeof (fl));
1022 fl.proto = IPPROTO_IPV6;
1023
1024 dsfield = ipv6_get_dsfield(ipv6h);
1025 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
1026 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1027 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
1028 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
1029
1030 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
1031 if (err != 0) {
1032 if (err == -EMSGSIZE)
1033 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
1034 return -1;
1035 }
1036
1037 return 0;
1038}
1039
1040static int
1041ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1042{
1043 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001044 struct net_device_stats *stats = &t->dev->stats;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001045 int ret;
1046
1047 if (t->recursion++) {
Pavel Emelyanov3dca02a2008-05-21 14:17:05 -07001048 stats->collisions++;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001049 goto tx_err;
1050 }
1051
1052 switch (skb->protocol) {
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001053 case __constant_htons(ETH_P_IP):
1054 ret = ip4ip6_tnl_xmit(skb, dev);
1055 break;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001056 case __constant_htons(ETH_P_IPV6):
1057 ret = ip6ip6_tnl_xmit(skb, dev);
1058 break;
1059 default:
1060 goto tx_err;
1061 }
1062
1063 if (ret < 0)
1064 goto tx_err;
1065
1066 t->recursion--;
1067 return 0;
1068
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069tx_err:
1070 stats->tx_errors++;
1071 stats->tx_dropped++;
1072 kfree_skb(skb);
1073 t->recursion--;
1074 return 0;
1075}
1076
1077static void ip6_tnl_set_cap(struct ip6_tnl *t)
1078{
1079 struct ip6_tnl_parm *p = &t->parms;
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001080 int ltype = ipv6_addr_type(&p->laddr);
1081 int rtype = ipv6_addr_type(&p->raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
1083 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
1084
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001085 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1086 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1087 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001088 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
Ville Nuorvala09c6bbf2006-11-24 17:06:27 -08001089 if (ltype&IPV6_ADDR_UNICAST)
1090 p->flags |= IP6_TNL_F_CAP_XMIT;
1091 if (rtype&IPV6_ADDR_UNICAST)
1092 p->flags |= IP6_TNL_F_CAP_RCV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 }
1094}
1095
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001096static void ip6_tnl_link_config(struct ip6_tnl *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097{
1098 struct net_device *dev = t->dev;
1099 struct ip6_tnl_parm *p = &t->parms;
1100 struct flowi *fl = &t->fl;
1101
1102 memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1103 memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1104
1105 /* Set up flowi template */
1106 ipv6_addr_copy(&fl->fl6_src, &p->laddr);
1107 ipv6_addr_copy(&fl->fl6_dst, &p->raddr);
1108 fl->oif = p->link;
1109 fl->fl6_flowlabel = 0;
1110
1111 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1112 fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1113 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1114 fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1115
1116 ip6_tnl_set_cap(t);
1117
1118 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1119 dev->flags |= IFF_POINTOPOINT;
1120 else
1121 dev->flags &= ~IFF_POINTOPOINT;
1122
1123 dev->iflink = p->link;
1124
1125 if (p->flags & IP6_TNL_F_CAP_XMIT) {
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001126 int strict = (ipv6_addr_type(&p->raddr) &
1127 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1128
Pavel Emelyanov2f7f54b2008-04-16 01:23:44 -07001129 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1130 &p->raddr, &p->laddr,
Ville Nuorvala305d4b32006-11-24 17:06:53 -08001131 p->link, strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132
1133 if (rt == NULL)
1134 return;
1135
1136 if (rt->rt6i_dev) {
1137 dev->hard_header_len = rt->rt6i_dev->hard_header_len +
1138 sizeof (struct ipv6hdr);
1139
1140 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr);
1141
1142 if (dev->mtu < IPV6_MIN_MTU)
1143 dev->mtu = IPV6_MIN_MTU;
1144 }
1145 dst_release(&rt->u.dst);
1146 }
1147}
1148
1149/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001150 * ip6_tnl_change - update the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 * @t: tunnel to be changed
1152 * @p: tunnel configuration parameters
1153 * @active: != 0 if tunnel is ready for use
1154 *
1155 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001156 * ip6_tnl_change() updates the tunnel parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 **/
1158
1159static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001160ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161{
1162 ipv6_addr_copy(&t->parms.laddr, &p->laddr);
1163 ipv6_addr_copy(&t->parms.raddr, &p->raddr);
1164 t->parms.flags = p->flags;
1165 t->parms.hop_limit = p->hop_limit;
1166 t->parms.encap_limit = p->encap_limit;
1167 t->parms.flowinfo = p->flowinfo;
Gabor Fekete8181b8c2005-06-08 14:54:38 -07001168 t->parms.link = p->link;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001169 t->parms.proto = p->proto;
Hugo Santos0c088892006-02-24 13:16:25 -08001170 ip6_tnl_dst_reset(t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001171 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 return 0;
1173}
1174
1175/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001176 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 * @dev: virtual device associated with tunnel
1178 * @ifr: parameters passed from userspace
1179 * @cmd: command to be performed
1180 *
1181 * Description:
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001182 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001183 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 *
1185 * The possible commands are the following:
1186 * %SIOCGETTUNNEL: get tunnel parameters for device
1187 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1188 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1189 * %SIOCDELTUNNEL: delete tunnel
1190 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001191 * The fallback device "ip6tnl0", created during module
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 * initialization, can be used for creating other tunnel devices.
1193 *
1194 * Return:
1195 * 0 on success,
1196 * %-EFAULT if unable to copy data to or from userspace,
1197 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1198 * %-EINVAL if passed tunnel parameters are invalid,
1199 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1200 * %-ENODEV if attempting to change or delete a nonexisting device
1201 **/
1202
1203static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001204ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205{
1206 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 struct ip6_tnl_parm p;
1208 struct ip6_tnl *t = NULL;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001209 struct net *net = dev_net(dev);
1210 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
1212 switch (cmd) {
1213 case SIOCGETTUNNEL:
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001214 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001215 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 err = -EFAULT;
1217 break;
1218 }
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001219 t = ip6_tnl_locate(net, &p, 0);
Ville Nuorvala567131a2006-11-24 17:05:41 -08001220 }
1221 if (t == NULL)
Patrick McHardy2941a482006-01-08 22:05:26 -08001222 t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 memcpy(&p, &t->parms, sizeof (p));
1224 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1225 err = -EFAULT;
1226 }
1227 break;
1228 case SIOCADDTUNNEL:
1229 case SIOCCHGTUNNEL:
1230 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 if (!capable(CAP_NET_ADMIN))
1232 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001233 err = -EFAULT;
1234 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001236 err = -EINVAL;
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001237 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1238 p.proto != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 break;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001240 t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001241 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001242 if (t != NULL) {
1243 if (t->dev != dev) {
1244 err = -EEXIST;
1245 break;
1246 }
1247 } else
1248 t = netdev_priv(dev);
1249
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001250 ip6_tnl_unlink(ip6n, t);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001251 err = ip6_tnl_change(t, &p);
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001252 ip6_tnl_link(ip6n, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 netdev_state_change(dev);
1254 }
Ville Nuorvala567131a2006-11-24 17:05:41 -08001255 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 err = 0;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001257 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
1258 err = -EFAULT;
1259
1260 } else
1261 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 break;
1263 case SIOCDELTUNNEL:
1264 err = -EPERM;
1265 if (!capable(CAP_NET_ADMIN))
1266 break;
1267
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001268 if (dev == ip6n->fb_tnl_dev) {
Ville Nuorvala567131a2006-11-24 17:05:41 -08001269 err = -EFAULT;
1270 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001272 err = -ENOENT;
Pavel Emelyanov2dd02c82008-04-16 01:22:23 -07001273 if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001275 err = -EPERM;
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001276 if (t->dev == ip6n->fb_tnl_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 break;
Ville Nuorvala567131a2006-11-24 17:05:41 -08001278 dev = t->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 }
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08001280 err = 0;
1281 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 break;
1283 default:
1284 err = -EINVAL;
1285 }
1286 return err;
1287}
1288
1289/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001290 * ip6_tnl_change_mtu - change mtu manually for tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 * @dev: virtual device associated with tunnel
1292 * @new_mtu: the new mtu
1293 *
1294 * Return:
1295 * 0 on success,
1296 * %-EINVAL if mtu too small
1297 **/
1298
1299static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001300ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301{
1302 if (new_mtu < IPV6_MIN_MTU) {
1303 return -EINVAL;
1304 }
1305 dev->mtu = new_mtu;
1306 return 0;
1307}
1308
1309/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001310 * ip6_tnl_dev_setup - setup virtual tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 * @dev: virtual device associated with tunnel
1312 *
1313 * Description:
1314 * Initialize function pointers and device parameters
1315 **/
1316
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001317static void ip6_tnl_dev_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318{
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001319 dev->uninit = ip6_tnl_dev_uninit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 dev->destructor = free_netdev;
Yasuyuki Kozakai61ec2ae2006-11-05 22:56:45 +09001321 dev->hard_start_xmit = ip6_tnl_xmit;
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001322 dev->do_ioctl = ip6_tnl_ioctl;
1323 dev->change_mtu = ip6_tnl_change_mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324
1325 dev->type = ARPHRD_TUNNEL6;
1326 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1327 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1328 dev->flags |= IFF_NOARP;
1329 dev->addr_len = sizeof(struct in6_addr);
Pavel Emelyanov554eb272008-04-16 01:24:13 -07001330 dev->features |= NETIF_F_NETNS_LOCAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331}
1332
1333
1334/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001335 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 * @dev: virtual device associated with tunnel
1337 **/
1338
1339static inline void
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001340ip6_tnl_dev_init_gen(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341{
Patrick McHardy2941a482006-01-08 22:05:26 -08001342 struct ip6_tnl *t = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 t->dev = dev;
1344 strcpy(t->parms.name, dev->name);
1345}
1346
1347/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001348 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 * @dev: virtual device associated with tunnel
1350 **/
1351
1352static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001353ip6_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354{
Patrick McHardy2941a482006-01-08 22:05:26 -08001355 struct ip6_tnl *t = netdev_priv(dev);
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001356 ip6_tnl_dev_init_gen(dev);
1357 ip6_tnl_link_config(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 return 0;
1359}
1360
1361/**
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001362 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 * @dev: fallback device
1364 *
1365 * Return: 0
1366 **/
1367
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001368static int
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001369ip6_fb_tnl_dev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370{
Patrick McHardy2941a482006-01-08 22:05:26 -08001371 struct ip6_tnl *t = netdev_priv(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001372 struct net *net = dev_net(dev);
1373 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1374
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001375 ip6_tnl_dev_init_gen(dev);
Yasuyuki Kozakai502b0932006-11-30 14:43:28 +09001376 t->parms.proto = IPPROTO_IPV6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 dev_hold(dev);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001378 ip6n->tnls_wc[0] = t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 return 0;
1380}
1381
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001382static struct xfrm6_tunnel ip4ip6_handler = {
1383 .handler = ip4ip6_rcv,
1384 .err_handler = ip4ip6_err,
1385 .priority = 1,
1386};
1387
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388static struct xfrm6_tunnel ip6ip6_handler = {
Patrick McHardy03037702005-07-19 14:03:34 -07001389 .handler = ip6ip6_rcv,
1390 .err_handler = ip6ip6_err,
Herbert Xud2acc342006-03-28 01:12:13 -08001391 .priority = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392};
1393
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001394static void ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
1395{
1396 int h;
1397 struct ip6_tnl *t;
1398
1399 for (h = 0; h < HASH_SIZE; h++) {
1400 while ((t = ip6n->tnls_r_l[h]) != NULL)
1401 unregister_netdevice(t->dev);
1402 }
1403
1404 t = ip6n->tnls_wc[0];
1405 unregister_netdevice(t->dev);
1406}
1407
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001408static int ip6_tnl_init_net(struct net *net)
1409{
1410 int err;
1411 struct ip6_tnl_net *ip6n;
1412
1413 err = -ENOMEM;
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001414 ip6n = kzalloc(sizeof(struct ip6_tnl_net), GFP_KERNEL);
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001415 if (ip6n == NULL)
1416 goto err_alloc;
1417
1418 err = net_assign_generic(net, ip6_tnl_net_id, ip6n);
1419 if (err < 0)
1420 goto err_assign;
1421
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001422 ip6n->tnls[0] = ip6n->tnls_wc;
1423 ip6n->tnls[1] = ip6n->tnls_r_l;
1424
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001425 err = -ENOMEM;
1426 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1427 ip6_tnl_dev_setup);
1428
1429 if (!ip6n->fb_tnl_dev)
1430 goto err_alloc_dev;
1431
1432 ip6n->fb_tnl_dev->init = ip6_fb_tnl_dev_init;
1433 dev_net_set(ip6n->fb_tnl_dev, net);
1434
1435 err = register_netdev(ip6n->fb_tnl_dev);
1436 if (err < 0)
1437 goto err_register;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001438 return 0;
1439
Pavel Emelyanov15820e1292008-04-16 01:23:02 -07001440err_register:
1441 free_netdev(ip6n->fb_tnl_dev);
1442err_alloc_dev:
1443 /* nothing */
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001444err_assign:
1445 kfree(ip6n);
1446err_alloc:
1447 return err;
1448}
1449
1450static void ip6_tnl_exit_net(struct net *net)
1451{
1452 struct ip6_tnl_net *ip6n;
1453
1454 ip6n = net_generic(net, ip6_tnl_net_id);
Pavel Emelyanov3e6c9fb2008-04-16 01:23:22 -07001455 rtnl_lock();
1456 ip6_tnl_destroy_tunnels(ip6n);
1457 rtnl_unlock();
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001458 kfree(ip6n);
1459}
1460
1461static struct pernet_operations ip6_tnl_net_ops = {
1462 .init = ip6_tnl_init_net,
1463 .exit = ip6_tnl_exit_net,
1464};
1465
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466/**
1467 * ip6_tunnel_init - register protocol and reserve needed resources
1468 *
1469 * Return: 0 on success
1470 **/
1471
1472static int __init ip6_tunnel_init(void)
1473{
1474 int err;
1475
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001476 if (xfrm6_tunnel_register(&ip4ip6_handler, AF_INET)) {
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001477 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001478 err = -EAGAIN;
1479 goto out;
1480 }
1481
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001482 if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) {
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001483 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001484 err = -EAGAIN;
1485 goto unreg_ip4ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 }
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001487
1488 err = register_pernet_gen_device(&ip6_tnl_net_id, &ip6_tnl_net_ops);
1489 if (err < 0)
1490 goto err_pernet;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 return 0;
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001492err_pernet:
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001493 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001494unreg_ip4ip6:
1495 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1496out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 return err;
1498}
1499
1500/**
1501 * ip6_tunnel_cleanup - free resources and unregister protocol
1502 **/
1503
1504static void __exit ip6_tunnel_cleanup(void)
1505{
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001506 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001507 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
Yasuyuki Kozakaic4d3efaf2007-02-15 00:43:16 +09001508
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001509 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
Yasuyuki Kozakai31445812007-02-10 00:30:33 +09001510 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
Pavel Emelyanov13eeb8e2008-04-16 01:22:02 -07001512 unregister_pernet_gen_device(ip6_tnl_net_id, &ip6_tnl_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513}
1514
1515module_init(ip6_tunnel_init);
1516module_exit(ip6_tunnel_cleanup);