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>
36 static xfrm_address_t
*mip6_xfrm_addr(struct xfrm_state
*x
, xfrm_address_t
*addr
)
41 static inline unsigned int calc_padlen(unsigned int len
, unsigned int n
)
43 return (n
- len
+ 16) & 0x7;
46 static inline void *mip6_padn(__u8
*data
, __u8 padlen
)
51 data
[0] = MIP6_OPT_PAD_1
;
52 } else if (padlen
> 1) {
53 data
[0] = MIP6_OPT_PAD_N
;
56 memset(data
+2, 0, data
[1]);
61 static inline void mip6_param_prob(struct sk_buff
*skb
, int code
, int pos
)
63 icmpv6_send(skb
, ICMPV6_PARAMPROB
, code
, pos
, skb
->dev
);
66 static int mip6_mh_len(int type
)
74 case IP6_MH_TYPE_HOTI
:
75 case IP6_MH_TYPE_COTI
:
77 case IP6_MH_TYPE_BACK
:
82 case IP6_MH_TYPE_BERROR
:
89 int mip6_mh_filter(struct sock
*sk
, struct sk_buff
*skb
)
93 if (!pskb_may_pull(skb
, (skb
->h
.raw
- skb
->data
) + 8) ||
94 !pskb_may_pull(skb
, (skb
->h
.raw
- skb
->data
) + ((skb
->h
.raw
[1] + 1) << 3)))
97 mh
= (struct ip6_mh
*)skb
->h
.raw
;
99 if (mh
->ip6mh_hdrlen
< mip6_mh_len(mh
->ip6mh_type
)) {
100 LIMIT_NETDEBUG(KERN_DEBUG
"mip6: MH message too short: %d vs >=%d\n",
101 mh
->ip6mh_hdrlen
, mip6_mh_len(mh
->ip6mh_type
));
102 mip6_param_prob(skb
, 0, ((&mh
->ip6mh_hdrlen
) -
103 skb_network_header(skb
)));
107 if (mh
->ip6mh_proto
!= IPPROTO_NONE
) {
108 LIMIT_NETDEBUG(KERN_DEBUG
"mip6: MH invalid payload proto = %d\n",
110 mip6_param_prob(skb
, 0, ((&mh
->ip6mh_proto
) -
111 skb_network_header(skb
)));
118 struct mip6_report_rate_limiter
{
120 struct timeval stamp
;
126 static struct mip6_report_rate_limiter mip6_report_rl
= {
127 .lock
= SPIN_LOCK_UNLOCKED
130 static int mip6_destopt_input(struct xfrm_state
*x
, struct sk_buff
*skb
)
132 struct ipv6hdr
*iph
= skb
->nh
.ipv6h
;
133 struct ipv6_destopt_hdr
*destopt
= (struct ipv6_destopt_hdr
*)skb
->data
;
135 if (!ipv6_addr_equal(&iph
->saddr
, (struct in6_addr
*)x
->coaddr
) &&
136 !ipv6_addr_any((struct in6_addr
*)x
->coaddr
))
139 return destopt
->nexthdr
;
142 /* Destination Option Header is inserted.
143 * IP Header's src address is replaced with Home Address Option in
144 * Destination Option Header.
146 static int mip6_destopt_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
149 struct ipv6_destopt_hdr
*dstopt
;
150 struct ipv6_destopt_hao
*hao
;
154 iph
= (struct ipv6hdr
*)skb
->data
;
155 iph
->payload_len
= htons(skb
->len
- sizeof(*iph
));
157 nexthdr
= *skb_network_header(skb
);
158 *skb_network_header(skb
) = IPPROTO_DSTOPTS
;
160 dstopt
= (struct ipv6_destopt_hdr
*)skb
->h
.raw
;
161 dstopt
->nexthdr
= nexthdr
;
163 hao
= mip6_padn((char *)(dstopt
+ 1),
164 calc_padlen(sizeof(*dstopt
), 6));
166 hao
->type
= IPV6_TLV_HAO
;
167 hao
->length
= sizeof(*hao
) - 2;
168 BUG_TRAP(hao
->length
== 16);
170 len
= ((char *)hao
- (char *)dstopt
) + sizeof(*hao
);
172 memcpy(&hao
->addr
, &iph
->saddr
, sizeof(hao
->addr
));
173 memcpy(&iph
->saddr
, x
->coaddr
, sizeof(iph
->saddr
));
175 BUG_TRAP(len
== x
->props
.header_len
);
176 dstopt
->hdrlen
= (x
->props
.header_len
>> 3) - 1;
181 static inline int mip6_report_rl_allow(struct timeval
*stamp
,
182 struct in6_addr
*dst
,
183 struct in6_addr
*src
, int iif
)
187 spin_lock_bh(&mip6_report_rl
.lock
);
188 if (mip6_report_rl
.stamp
.tv_sec
!= stamp
->tv_sec
||
189 mip6_report_rl
.stamp
.tv_usec
!= stamp
->tv_usec
||
190 mip6_report_rl
.iif
!= iif
||
191 !ipv6_addr_equal(&mip6_report_rl
.src
, src
) ||
192 !ipv6_addr_equal(&mip6_report_rl
.dst
, dst
)) {
193 mip6_report_rl
.stamp
.tv_sec
= stamp
->tv_sec
;
194 mip6_report_rl
.stamp
.tv_usec
= stamp
->tv_usec
;
195 mip6_report_rl
.iif
= iif
;
196 ipv6_addr_copy(&mip6_report_rl
.src
, src
);
197 ipv6_addr_copy(&mip6_report_rl
.dst
, dst
);
200 spin_unlock_bh(&mip6_report_rl
.lock
);
204 static int mip6_destopt_reject(struct xfrm_state
*x
, struct sk_buff
*skb
, struct flowi
*fl
)
206 struct inet6_skb_parm
*opt
= (struct inet6_skb_parm
*)skb
->cb
;
207 struct ipv6_destopt_hao
*hao
= NULL
;
208 struct xfrm_selector sel
;
210 struct timeval stamp
;
213 if (unlikely(fl
->proto
== IPPROTO_MH
&&
214 fl
->fl_mh_type
<= IP6_MH_TYPE_MAX
))
217 if (likely(opt
->dsthao
)) {
218 offset
= ipv6_find_tlv(skb
, opt
->dsthao
, IPV6_TLV_HAO
);
219 if (likely(offset
>= 0))
220 hao
= (struct ipv6_destopt_hao
*)
221 (skb_network_header(skb
) + offset
);
224 skb_get_timestamp(skb
, &stamp
);
226 if (!mip6_report_rl_allow(&stamp
, &skb
->nh
.ipv6h
->daddr
,
227 hao
? &hao
->addr
: &skb
->nh
.ipv6h
->saddr
,
231 memset(&sel
, 0, sizeof(sel
));
232 memcpy(&sel
.daddr
, (xfrm_address_t
*)&skb
->nh
.ipv6h
->daddr
,
234 sel
.prefixlen_d
= 128;
235 memcpy(&sel
.saddr
, (xfrm_address_t
*)&skb
->nh
.ipv6h
->saddr
,
237 sel
.prefixlen_s
= 128;
238 sel
.family
= AF_INET6
;
239 sel
.proto
= fl
->proto
;
240 sel
.dport
= xfrm_flowi_dport(fl
);
242 sel
.dport_mask
= htons(~0);
243 sel
.sport
= xfrm_flowi_sport(fl
);
245 sel
.sport_mask
= htons(~0);
246 sel
.ifindex
= fl
->oif
;
248 err
= km_report(IPPROTO_DSTOPTS
, &sel
,
249 (hao
? (xfrm_address_t
*)&hao
->addr
: NULL
));
255 static int mip6_destopt_offset(struct xfrm_state
*x
, struct sk_buff
*skb
,
258 u16 offset
= sizeof(struct ipv6hdr
);
259 struct ipv6_opt_hdr
*exthdr
= (struct ipv6_opt_hdr
*)(skb
->nh
.ipv6h
+ 1);
260 const unsigned char *nh
= skb_network_header(skb
);
261 unsigned int packet_len
= skb
->tail
- nh
;
264 *nexthdr
= &skb
->nh
.ipv6h
->nexthdr
;
266 while (offset
+ 1 <= packet_len
) {
271 case NEXTHDR_ROUTING
:
276 * HAO MUST NOT appear more than once.
277 * XXX: It is better to try to find by the end of
278 * XXX: packet if HAO exists.
280 if (ipv6_find_tlv(skb
, offset
, IPV6_TLV_HAO
) >= 0) {
281 LIMIT_NETDEBUG(KERN_WARNING
"mip6: hao exists already, override\n");
293 offset
+= ipv6_optlen(exthdr
);
294 *nexthdr
= &exthdr
->nexthdr
;
295 exthdr
= (struct ipv6_opt_hdr
*)(nh
+ offset
);
301 static int mip6_destopt_init_state(struct xfrm_state
*x
)
304 printk(KERN_INFO
"%s: spi is not 0: %u\n", __FUNCTION__
,
308 if (x
->props
.mode
!= XFRM_MODE_ROUTEOPTIMIZATION
) {
309 printk(KERN_INFO
"%s: state's mode is not %u: %u\n",
310 __FUNCTION__
, XFRM_MODE_ROUTEOPTIMIZATION
, x
->props
.mode
);
314 x
->props
.header_len
= sizeof(struct ipv6_destopt_hdr
) +
315 calc_padlen(sizeof(struct ipv6_destopt_hdr
), 6) +
316 sizeof(struct ipv6_destopt_hao
);
317 BUG_TRAP(x
->props
.header_len
== 24);
323 * Do nothing about destroying since it has no specific operation for
324 * destination options header unlike IPsec protocols.
326 static void mip6_destopt_destroy(struct xfrm_state
*x
)
330 static struct xfrm_type mip6_destopt_type
=
332 .description
= "MIP6DESTOPT",
333 .owner
= THIS_MODULE
,
334 .proto
= IPPROTO_DSTOPTS
,
335 .flags
= XFRM_TYPE_NON_FRAGMENT
,
336 .init_state
= mip6_destopt_init_state
,
337 .destructor
= mip6_destopt_destroy
,
338 .input
= mip6_destopt_input
,
339 .output
= mip6_destopt_output
,
340 .reject
= mip6_destopt_reject
,
341 .hdr_offset
= mip6_destopt_offset
,
342 .local_addr
= mip6_xfrm_addr
,
345 static int mip6_rthdr_input(struct xfrm_state
*x
, struct sk_buff
*skb
)
347 struct rt2_hdr
*rt2
= (struct rt2_hdr
*)skb
->data
;
349 if (!ipv6_addr_equal(&rt2
->addr
, (struct in6_addr
*)x
->coaddr
) &&
350 !ipv6_addr_any((struct in6_addr
*)x
->coaddr
))
353 return rt2
->rt_hdr
.nexthdr
;
356 /* Routing Header type 2 is inserted.
357 * IP Header's dst address is replaced with Routing Header's Home Address.
359 static int mip6_rthdr_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
365 iph
= (struct ipv6hdr
*)skb
->data
;
366 iph
->payload_len
= htons(skb
->len
- sizeof(*iph
));
368 nexthdr
= *skb_network_header(skb
);
369 *skb_network_header(skb
) = IPPROTO_ROUTING
;
371 rt2
= (struct rt2_hdr
*)skb
->h
.raw
;
372 rt2
->rt_hdr
.nexthdr
= nexthdr
;
373 rt2
->rt_hdr
.hdrlen
= (x
->props
.header_len
>> 3) - 1;
374 rt2
->rt_hdr
.type
= IPV6_SRCRT_TYPE_2
;
375 rt2
->rt_hdr
.segments_left
= 1;
376 memset(&rt2
->reserved
, 0, sizeof(rt2
->reserved
));
378 BUG_TRAP(rt2
->rt_hdr
.hdrlen
== 2);
380 memcpy(&rt2
->addr
, &iph
->daddr
, sizeof(rt2
->addr
));
381 memcpy(&iph
->daddr
, x
->coaddr
, sizeof(iph
->daddr
));
386 static int mip6_rthdr_offset(struct xfrm_state
*x
, struct sk_buff
*skb
,
389 u16 offset
= sizeof(struct ipv6hdr
);
390 struct ipv6_opt_hdr
*exthdr
= (struct ipv6_opt_hdr
*)(skb
->nh
.ipv6h
+ 1);
391 const unsigned char *nh
= skb_network_header(skb
);
392 unsigned int packet_len
= skb
->tail
- nh
;
395 *nexthdr
= &skb
->nh
.ipv6h
->nexthdr
;
397 while (offset
+ 1 <= packet_len
) {
402 case NEXTHDR_ROUTING
:
403 if (offset
+ 3 <= packet_len
) {
404 struct ipv6_rt_hdr
*rt
;
405 rt
= (struct ipv6_rt_hdr
*)(nh
+ offset
);
412 if (ipv6_find_tlv(skb
, offset
, IPV6_TLV_HAO
) >= 0)
423 offset
+= ipv6_optlen(exthdr
);
424 *nexthdr
= &exthdr
->nexthdr
;
425 exthdr
= (struct ipv6_opt_hdr
*)(nh
+ offset
);
431 static int mip6_rthdr_init_state(struct xfrm_state
*x
)
434 printk(KERN_INFO
"%s: spi is not 0: %u\n", __FUNCTION__
,
438 if (x
->props
.mode
!= XFRM_MODE_ROUTEOPTIMIZATION
) {
439 printk(KERN_INFO
"%s: state's mode is not %u: %u\n",
440 __FUNCTION__
, XFRM_MODE_ROUTEOPTIMIZATION
, x
->props
.mode
);
444 x
->props
.header_len
= sizeof(struct rt2_hdr
);
450 * Do nothing about destroying since it has no specific operation for routing
451 * header type 2 unlike IPsec protocols.
453 static void mip6_rthdr_destroy(struct xfrm_state
*x
)
457 static struct xfrm_type mip6_rthdr_type
=
459 .description
= "MIP6RT",
460 .owner
= THIS_MODULE
,
461 .proto
= IPPROTO_ROUTING
,
462 .flags
= XFRM_TYPE_NON_FRAGMENT
,
463 .init_state
= mip6_rthdr_init_state
,
464 .destructor
= mip6_rthdr_destroy
,
465 .input
= mip6_rthdr_input
,
466 .output
= mip6_rthdr_output
,
467 .hdr_offset
= mip6_rthdr_offset
,
468 .remote_addr
= mip6_xfrm_addr
,
471 int __init
mip6_init(void)
473 printk(KERN_INFO
"Mobile IPv6\n");
475 if (xfrm_register_type(&mip6_destopt_type
, AF_INET6
) < 0) {
476 printk(KERN_INFO
"%s: can't add xfrm type(destopt)\n", __FUNCTION__
);
477 goto mip6_destopt_xfrm_fail
;
479 if (xfrm_register_type(&mip6_rthdr_type
, AF_INET6
) < 0) {
480 printk(KERN_INFO
"%s: can't add xfrm type(rthdr)\n", __FUNCTION__
);
481 goto mip6_rthdr_xfrm_fail
;
485 mip6_rthdr_xfrm_fail
:
486 xfrm_unregister_type(&mip6_destopt_type
, AF_INET6
);
487 mip6_destopt_xfrm_fail
:
491 void __exit
mip6_fini(void)
493 if (xfrm_unregister_type(&mip6_rthdr_type
, AF_INET6
) < 0)
494 printk(KERN_INFO
"%s: can't remove xfrm type(rthdr)\n", __FUNCTION__
);
495 if (xfrm_unregister_type(&mip6_destopt_type
, AF_INET6
) < 0)
496 printk(KERN_INFO
"%s: can't remove xfrm type(destopt)\n", __FUNCTION__
);