2 * Copyright (C)2003-2006 Helsinki University of Technology
3 * Copyright (C)2003-2006 USAGI/WIDE Project
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * Noriaki TAKAMIYA @USAGI
22 * Masahide NAKAMURA @USAGI
25 #include <linux/module.h>
26 #include <linux/skbuff.h>
27 #include <linux/time.h>
28 #include <linux/ipv6.h>
29 #include <linux/icmpv6.h>
32 #include <net/ip6_checksum.h>
33 #include <net/rawv6.h>
37 static xfrm_address_t
*mip6_xfrm_addr(struct xfrm_state
*x
, xfrm_address_t
*addr
)
42 static inline unsigned int calc_padlen(unsigned int len
, unsigned int n
)
44 return (n
- len
+ 16) & 0x7;
47 static inline void *mip6_padn(__u8
*data
, __u8 padlen
)
52 data
[0] = MIP6_OPT_PAD_1
;
53 } else if (padlen
> 1) {
54 data
[0] = MIP6_OPT_PAD_N
;
57 memset(data
+2, 0, data
[1]);
62 static inline void mip6_param_prob(struct sk_buff
*skb
, int code
, int pos
)
64 icmpv6_send(skb
, ICMPV6_PARAMPROB
, code
, pos
, skb
->dev
);
67 static int mip6_mh_len(int type
)
75 case IP6_MH_TYPE_HOTI
:
76 case IP6_MH_TYPE_COTI
:
78 case IP6_MH_TYPE_BACK
:
83 case IP6_MH_TYPE_BERROR
:
90 static int mip6_mh_filter(struct sock
*sk
, struct sk_buff
*skb
)
94 if (!pskb_may_pull(skb
, (skb_transport_offset(skb
)) + 8) ||
95 !pskb_may_pull(skb
, (skb_transport_offset(skb
) +
96 ((skb_transport_header(skb
)[1] + 1) << 3))))
99 mh
= (struct ip6_mh
*)skb_transport_header(skb
);
101 if (mh
->ip6mh_hdrlen
< mip6_mh_len(mh
->ip6mh_type
)) {
102 LIMIT_NETDEBUG(KERN_DEBUG
"mip6: MH message too short: %d vs >=%d\n",
103 mh
->ip6mh_hdrlen
, mip6_mh_len(mh
->ip6mh_type
));
104 mip6_param_prob(skb
, 0, ((&mh
->ip6mh_hdrlen
) -
105 skb_network_header(skb
)));
109 if (mh
->ip6mh_proto
!= IPPROTO_NONE
) {
110 LIMIT_NETDEBUG(KERN_DEBUG
"mip6: MH invalid payload proto = %d\n",
112 mip6_param_prob(skb
, 0, ((&mh
->ip6mh_proto
) -
113 skb_network_header(skb
)));
120 struct mip6_report_rate_limiter
{
122 struct timeval stamp
;
128 static struct mip6_report_rate_limiter mip6_report_rl
= {
129 .lock
= __SPIN_LOCK_UNLOCKED(mip6_report_rl
.lock
)
132 static int mip6_destopt_input(struct xfrm_state
*x
, struct sk_buff
*skb
)
134 struct ipv6hdr
*iph
= ipv6_hdr(skb
);
135 struct ipv6_destopt_hdr
*destopt
= (struct ipv6_destopt_hdr
*)skb
->data
;
137 if (!ipv6_addr_equal(&iph
->saddr
, (struct in6_addr
*)x
->coaddr
) &&
138 !ipv6_addr_any((struct in6_addr
*)x
->coaddr
))
141 return destopt
->nexthdr
;
144 /* Destination Option Header is inserted.
145 * IP Header's src address is replaced with Home Address Option in
146 * Destination Option Header.
148 static int mip6_destopt_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
151 struct ipv6_destopt_hdr
*dstopt
;
152 struct ipv6_destopt_hao
*hao
;
157 iph
->payload_len
= htons(skb
->len
- sizeof(*iph
));
159 nexthdr
= *skb_mac_header(skb
);
160 *skb_mac_header(skb
) = IPPROTO_DSTOPTS
;
162 dstopt
= (struct ipv6_destopt_hdr
*)skb_transport_header(skb
);
163 dstopt
->nexthdr
= nexthdr
;
165 hao
= mip6_padn((char *)(dstopt
+ 1),
166 calc_padlen(sizeof(*dstopt
), 6));
168 hao
->type
= IPV6_TLV_HAO
;
169 hao
->length
= sizeof(*hao
) - 2;
170 BUG_TRAP(hao
->length
== 16);
172 len
= ((char *)hao
- (char *)dstopt
) + sizeof(*hao
);
174 memcpy(&hao
->addr
, &iph
->saddr
, sizeof(hao
->addr
));
175 memcpy(&iph
->saddr
, x
->coaddr
, sizeof(iph
->saddr
));
177 BUG_TRAP(len
== x
->props
.header_len
);
178 dstopt
->hdrlen
= (x
->props
.header_len
>> 3) - 1;
183 static inline int mip6_report_rl_allow(struct timeval
*stamp
,
184 struct in6_addr
*dst
,
185 struct in6_addr
*src
, int iif
)
189 spin_lock_bh(&mip6_report_rl
.lock
);
190 if (mip6_report_rl
.stamp
.tv_sec
!= stamp
->tv_sec
||
191 mip6_report_rl
.stamp
.tv_usec
!= stamp
->tv_usec
||
192 mip6_report_rl
.iif
!= iif
||
193 !ipv6_addr_equal(&mip6_report_rl
.src
, src
) ||
194 !ipv6_addr_equal(&mip6_report_rl
.dst
, dst
)) {
195 mip6_report_rl
.stamp
.tv_sec
= stamp
->tv_sec
;
196 mip6_report_rl
.stamp
.tv_usec
= stamp
->tv_usec
;
197 mip6_report_rl
.iif
= iif
;
198 ipv6_addr_copy(&mip6_report_rl
.src
, src
);
199 ipv6_addr_copy(&mip6_report_rl
.dst
, dst
);
202 spin_unlock_bh(&mip6_report_rl
.lock
);
206 static int mip6_destopt_reject(struct xfrm_state
*x
, struct sk_buff
*skb
, struct flowi
*fl
)
208 struct inet6_skb_parm
*opt
= (struct inet6_skb_parm
*)skb
->cb
;
209 struct ipv6_destopt_hao
*hao
= NULL
;
210 struct xfrm_selector sel
;
212 struct timeval stamp
;
215 if (unlikely(fl
->proto
== IPPROTO_MH
&&
216 fl
->fl_mh_type
<= IP6_MH_TYPE_MAX
))
219 if (likely(opt
->dsthao
)) {
220 offset
= ipv6_find_tlv(skb
, opt
->dsthao
, IPV6_TLV_HAO
);
221 if (likely(offset
>= 0))
222 hao
= (struct ipv6_destopt_hao
*)
223 (skb_network_header(skb
) + offset
);
226 skb_get_timestamp(skb
, &stamp
);
228 if (!mip6_report_rl_allow(&stamp
, &ipv6_hdr(skb
)->daddr
,
229 hao
? &hao
->addr
: &ipv6_hdr(skb
)->saddr
,
233 memset(&sel
, 0, sizeof(sel
));
234 memcpy(&sel
.daddr
, (xfrm_address_t
*)&ipv6_hdr(skb
)->daddr
,
236 sel
.prefixlen_d
= 128;
237 memcpy(&sel
.saddr
, (xfrm_address_t
*)&ipv6_hdr(skb
)->saddr
,
239 sel
.prefixlen_s
= 128;
240 sel
.family
= AF_INET6
;
241 sel
.proto
= fl
->proto
;
242 sel
.dport
= xfrm_flowi_dport(fl
);
244 sel
.dport_mask
= htons(~0);
245 sel
.sport
= xfrm_flowi_sport(fl
);
247 sel
.sport_mask
= htons(~0);
248 sel
.ifindex
= fl
->oif
;
250 err
= km_report(IPPROTO_DSTOPTS
, &sel
,
251 (hao
? (xfrm_address_t
*)&hao
->addr
: NULL
));
257 static int mip6_destopt_offset(struct xfrm_state
*x
, struct sk_buff
*skb
,
260 u16 offset
= sizeof(struct ipv6hdr
);
261 struct ipv6_opt_hdr
*exthdr
=
262 (struct ipv6_opt_hdr
*)(ipv6_hdr(skb
) + 1);
263 const unsigned char *nh
= skb_network_header(skb
);
264 unsigned int packet_len
= skb
->tail
- skb
->network_header
;
267 *nexthdr
= &ipv6_hdr(skb
)->nexthdr
;
269 while (offset
+ 1 <= packet_len
) {
274 case NEXTHDR_ROUTING
:
279 * HAO MUST NOT appear more than once.
280 * XXX: It is better to try to find by the end of
281 * XXX: packet if HAO exists.
283 if (ipv6_find_tlv(skb
, offset
, IPV6_TLV_HAO
) >= 0) {
284 LIMIT_NETDEBUG(KERN_WARNING
"mip6: hao exists already, override\n");
296 offset
+= ipv6_optlen(exthdr
);
297 *nexthdr
= &exthdr
->nexthdr
;
298 exthdr
= (struct ipv6_opt_hdr
*)(nh
+ offset
);
304 static int mip6_destopt_init_state(struct xfrm_state
*x
)
307 printk(KERN_INFO
"%s: spi is not 0: %u\n", __FUNCTION__
,
311 if (x
->props
.mode
!= XFRM_MODE_ROUTEOPTIMIZATION
) {
312 printk(KERN_INFO
"%s: state's mode is not %u: %u\n",
313 __FUNCTION__
, XFRM_MODE_ROUTEOPTIMIZATION
, x
->props
.mode
);
317 x
->props
.header_len
= sizeof(struct ipv6_destopt_hdr
) +
318 calc_padlen(sizeof(struct ipv6_destopt_hdr
), 6) +
319 sizeof(struct ipv6_destopt_hao
);
320 BUG_TRAP(x
->props
.header_len
== 24);
326 * Do nothing about destroying since it has no specific operation for
327 * destination options header unlike IPsec protocols.
329 static void mip6_destopt_destroy(struct xfrm_state
*x
)
333 static struct xfrm_type mip6_destopt_type
=
335 .description
= "MIP6DESTOPT",
336 .owner
= THIS_MODULE
,
337 .proto
= IPPROTO_DSTOPTS
,
338 .flags
= XFRM_TYPE_NON_FRAGMENT
,
339 .init_state
= mip6_destopt_init_state
,
340 .destructor
= mip6_destopt_destroy
,
341 .input
= mip6_destopt_input
,
342 .output
= mip6_destopt_output
,
343 .reject
= mip6_destopt_reject
,
344 .hdr_offset
= mip6_destopt_offset
,
345 .local_addr
= mip6_xfrm_addr
,
348 static int mip6_rthdr_input(struct xfrm_state
*x
, struct sk_buff
*skb
)
350 struct rt2_hdr
*rt2
= (struct rt2_hdr
*)skb
->data
;
352 if (!ipv6_addr_equal(&rt2
->addr
, (struct in6_addr
*)x
->coaddr
) &&
353 !ipv6_addr_any((struct in6_addr
*)x
->coaddr
))
356 return rt2
->rt_hdr
.nexthdr
;
359 /* Routing Header type 2 is inserted.
360 * IP Header's dst address is replaced with Routing Header's Home Address.
362 static int mip6_rthdr_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
369 iph
->payload_len
= htons(skb
->len
- sizeof(*iph
));
371 nexthdr
= *skb_mac_header(skb
);
372 *skb_mac_header(skb
) = IPPROTO_ROUTING
;
374 rt2
= (struct rt2_hdr
*)skb_transport_header(skb
);
375 rt2
->rt_hdr
.nexthdr
= nexthdr
;
376 rt2
->rt_hdr
.hdrlen
= (x
->props
.header_len
>> 3) - 1;
377 rt2
->rt_hdr
.type
= IPV6_SRCRT_TYPE_2
;
378 rt2
->rt_hdr
.segments_left
= 1;
379 memset(&rt2
->reserved
, 0, sizeof(rt2
->reserved
));
381 BUG_TRAP(rt2
->rt_hdr
.hdrlen
== 2);
383 memcpy(&rt2
->addr
, &iph
->daddr
, sizeof(rt2
->addr
));
384 memcpy(&iph
->daddr
, x
->coaddr
, sizeof(iph
->daddr
));
389 static int mip6_rthdr_offset(struct xfrm_state
*x
, struct sk_buff
*skb
,
392 u16 offset
= sizeof(struct ipv6hdr
);
393 struct ipv6_opt_hdr
*exthdr
=
394 (struct ipv6_opt_hdr
*)(ipv6_hdr(skb
) + 1);
395 const unsigned char *nh
= skb_network_header(skb
);
396 unsigned int packet_len
= skb
->tail
- skb
->network_header
;
399 *nexthdr
= &ipv6_hdr(skb
)->nexthdr
;
401 while (offset
+ 1 <= packet_len
) {
406 case NEXTHDR_ROUTING
:
407 if (offset
+ 3 <= packet_len
) {
408 struct ipv6_rt_hdr
*rt
;
409 rt
= (struct ipv6_rt_hdr
*)(nh
+ offset
);
416 if (ipv6_find_tlv(skb
, offset
, IPV6_TLV_HAO
) >= 0)
427 offset
+= ipv6_optlen(exthdr
);
428 *nexthdr
= &exthdr
->nexthdr
;
429 exthdr
= (struct ipv6_opt_hdr
*)(nh
+ offset
);
435 static int mip6_rthdr_init_state(struct xfrm_state
*x
)
438 printk(KERN_INFO
"%s: spi is not 0: %u\n", __FUNCTION__
,
442 if (x
->props
.mode
!= XFRM_MODE_ROUTEOPTIMIZATION
) {
443 printk(KERN_INFO
"%s: state's mode is not %u: %u\n",
444 __FUNCTION__
, XFRM_MODE_ROUTEOPTIMIZATION
, x
->props
.mode
);
448 x
->props
.header_len
= sizeof(struct rt2_hdr
);
454 * Do nothing about destroying since it has no specific operation for routing
455 * header type 2 unlike IPsec protocols.
457 static void mip6_rthdr_destroy(struct xfrm_state
*x
)
461 static struct xfrm_type mip6_rthdr_type
=
463 .description
= "MIP6RT",
464 .owner
= THIS_MODULE
,
465 .proto
= IPPROTO_ROUTING
,
466 .flags
= XFRM_TYPE_NON_FRAGMENT
,
467 .init_state
= mip6_rthdr_init_state
,
468 .destructor
= mip6_rthdr_destroy
,
469 .input
= mip6_rthdr_input
,
470 .output
= mip6_rthdr_output
,
471 .hdr_offset
= mip6_rthdr_offset
,
472 .remote_addr
= mip6_xfrm_addr
,
475 static int __init
mip6_init(void)
477 printk(KERN_INFO
"Mobile IPv6\n");
479 if (xfrm_register_type(&mip6_destopt_type
, AF_INET6
) < 0) {
480 printk(KERN_INFO
"%s: can't add xfrm type(destopt)\n", __FUNCTION__
);
481 goto mip6_destopt_xfrm_fail
;
483 if (xfrm_register_type(&mip6_rthdr_type
, AF_INET6
) < 0) {
484 printk(KERN_INFO
"%s: can't add xfrm type(rthdr)\n", __FUNCTION__
);
485 goto mip6_rthdr_xfrm_fail
;
487 if (rawv6_mh_filter_register(mip6_mh_filter
) < 0) {
488 printk(KERN_INFO
"%s: can't add rawv6 mh filter\n", __FUNCTION__
);
489 goto mip6_rawv6_mh_fail
;
496 xfrm_unregister_type(&mip6_rthdr_type
, AF_INET6
);
497 mip6_rthdr_xfrm_fail
:
498 xfrm_unregister_type(&mip6_destopt_type
, AF_INET6
);
499 mip6_destopt_xfrm_fail
:
503 static void __exit
mip6_fini(void)
505 if (rawv6_mh_filter_unregister(mip6_mh_filter
) < 0)
506 printk(KERN_INFO
"%s: can't remove rawv6 mh filter\n", __FUNCTION__
);
507 if (xfrm_unregister_type(&mip6_rthdr_type
, AF_INET6
) < 0)
508 printk(KERN_INFO
"%s: can't remove xfrm type(rthdr)\n", __FUNCTION__
);
509 if (xfrm_unregister_type(&mip6_destopt_type
, AF_INET6
) < 0)
510 printk(KERN_INFO
"%s: can't remove xfrm type(destopt)\n", __FUNCTION__
);
513 module_init(mip6_init
);
514 module_exit(mip6_fini
);
516 MODULE_LICENSE("GPL");
517 MODULE_ALIAS_XFRM_TYPE(AF_INET6
, XFRM_PROTO_DSTOPTS
);
518 MODULE_ALIAS_XFRM_TYPE(AF_INET6
, XFRM_PROTO_ROUTING
);