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/config.h>
26 #include <linux/module.h>
27 #include <linux/skbuff.h>
28 #include <linux/time.h>
29 #include <linux/ipv6.h>
30 #include <linux/icmpv6.h>
33 #include <net/ip6_checksum.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 int mip6_mh_filter(struct sock
*sk
, struct sk_buff
*skb
)
95 if (!pskb_may_pull(skb
, (skb
->h
.raw
- skb
->data
) + 8) ||
96 !pskb_may_pull(skb
, (skb
->h
.raw
- skb
->data
) + ((skb
->h
.raw
[1] + 1) << 3)))
99 mh
= (struct ip6_mh
*)skb
->h
.raw
;
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
) - skb
->nh
.raw
);
107 mhlen
= (mh
->ip6mh_hdrlen
+ 1) << 3;
109 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
110 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
111 if (csum_ipv6_magic(&skb
->nh
.ipv6h
->saddr
,
112 &skb
->nh
.ipv6h
->daddr
,
115 LIMIT_NETDEBUG(KERN_DEBUG
"mip6: MH hw checksum failed\n");
116 skb
->ip_summed
= CHECKSUM_NONE
;
119 if (skb
->ip_summed
== CHECKSUM_NONE
) {
120 if (csum_ipv6_magic(&skb
->nh
.ipv6h
->saddr
,
121 &skb
->nh
.ipv6h
->daddr
,
123 skb_checksum(skb
, 0, mhlen
, 0))) {
124 LIMIT_NETDEBUG(KERN_DEBUG
"mip6: MH checksum failed [%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x > %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]\n",
125 NIP6(skb
->nh
.ipv6h
->saddr
),
126 NIP6(skb
->nh
.ipv6h
->daddr
));
129 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
132 if (mh
->ip6mh_proto
!= IPPROTO_NONE
) {
133 LIMIT_NETDEBUG(KERN_DEBUG
"mip6: MH invalid payload proto = %d\n",
135 mip6_param_prob(skb
, 0, (&mh
->ip6mh_proto
) - skb
->nh
.raw
);
142 struct mip6_report_rate_limiter
{
144 struct timeval stamp
;
150 static struct mip6_report_rate_limiter mip6_report_rl
= {
151 .lock
= SPIN_LOCK_UNLOCKED
154 static int mip6_destopt_input(struct xfrm_state
*x
, struct sk_buff
*skb
)
156 struct ipv6hdr
*iph
= skb
->nh
.ipv6h
;
157 struct ipv6_destopt_hdr
*destopt
= (struct ipv6_destopt_hdr
*)skb
->data
;
159 if (!ipv6_addr_equal(&iph
->saddr
, (struct in6_addr
*)x
->coaddr
) &&
160 !ipv6_addr_any((struct in6_addr
*)x
->coaddr
))
163 return destopt
->nexthdr
;
166 /* Destination Option Header is inserted.
167 * IP Header's src address is replaced with Home Address Option in
168 * Destination Option Header.
170 static int mip6_destopt_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
173 struct ipv6_destopt_hdr
*dstopt
;
174 struct ipv6_destopt_hao
*hao
;
178 iph
= (struct ipv6hdr
*)skb
->data
;
179 iph
->payload_len
= htons(skb
->len
- sizeof(*iph
));
181 nexthdr
= *skb
->nh
.raw
;
182 *skb
->nh
.raw
= IPPROTO_DSTOPTS
;
184 dstopt
= (struct ipv6_destopt_hdr
*)skb
->h
.raw
;
185 dstopt
->nexthdr
= nexthdr
;
187 hao
= mip6_padn((char *)(dstopt
+ 1),
188 calc_padlen(sizeof(*dstopt
), 6));
190 hao
->type
= IPV6_TLV_HAO
;
191 hao
->length
= sizeof(*hao
) - 2;
192 BUG_TRAP(hao
->length
== 16);
194 len
= ((char *)hao
- (char *)dstopt
) + sizeof(*hao
);
196 memcpy(&hao
->addr
, &iph
->saddr
, sizeof(hao
->addr
));
197 memcpy(&iph
->saddr
, x
->coaddr
, sizeof(iph
->saddr
));
199 BUG_TRAP(len
== x
->props
.header_len
);
200 dstopt
->hdrlen
= (x
->props
.header_len
>> 3) - 1;
205 static inline int mip6_report_rl_allow(struct timeval
*stamp
,
206 struct in6_addr
*dst
,
207 struct in6_addr
*src
, int iif
)
211 spin_lock_bh(&mip6_report_rl
.lock
);
212 if (mip6_report_rl
.stamp
.tv_sec
!= stamp
->tv_sec
||
213 mip6_report_rl
.stamp
.tv_usec
!= stamp
->tv_usec
||
214 mip6_report_rl
.iif
!= iif
||
215 !ipv6_addr_equal(&mip6_report_rl
.src
, src
) ||
216 !ipv6_addr_equal(&mip6_report_rl
.dst
, dst
)) {
217 mip6_report_rl
.stamp
.tv_sec
= stamp
->tv_sec
;
218 mip6_report_rl
.stamp
.tv_usec
= stamp
->tv_usec
;
219 mip6_report_rl
.iif
= iif
;
220 ipv6_addr_copy(&mip6_report_rl
.src
, src
);
221 ipv6_addr_copy(&mip6_report_rl
.dst
, dst
);
224 spin_unlock_bh(&mip6_report_rl
.lock
);
228 static int mip6_destopt_reject(struct xfrm_state
*x
, struct sk_buff
*skb
, struct flowi
*fl
)
230 struct inet6_skb_parm
*opt
= (struct inet6_skb_parm
*)skb
->cb
;
231 struct ipv6_destopt_hao
*hao
= NULL
;
232 struct xfrm_selector sel
;
234 struct timeval stamp
;
237 if (likely(opt
->dsthao
)) {
238 offset
= ipv6_find_tlv(skb
, opt
->dsthao
, IPV6_TLV_HAO
);
239 if (likely(offset
>= 0))
240 hao
= (struct ipv6_destopt_hao
*)(skb
->nh
.raw
+ offset
);
243 skb_get_timestamp(skb
, &stamp
);
245 if (!mip6_report_rl_allow(&stamp
, &skb
->nh
.ipv6h
->daddr
,
246 hao
? &hao
->addr
: &skb
->nh
.ipv6h
->saddr
,
250 memset(&sel
, 0, sizeof(sel
));
251 memcpy(&sel
.daddr
, (xfrm_address_t
*)&skb
->nh
.ipv6h
->daddr
,
253 sel
.prefixlen_d
= 128;
254 memcpy(&sel
.saddr
, (xfrm_address_t
*)&skb
->nh
.ipv6h
->saddr
,
256 sel
.prefixlen_s
= 128;
257 sel
.family
= AF_INET6
;
258 sel
.proto
= fl
->proto
;
259 sel
.dport
= xfrm_flowi_dport(fl
);
261 sel
.dport_mask
= ~((__u16
)0);
262 sel
.sport
= xfrm_flowi_sport(fl
);
264 sel
.sport_mask
= ~((__u16
)0);
265 sel
.ifindex
= fl
->oif
;
267 err
= km_report(IPPROTO_DSTOPTS
, &sel
,
268 (hao
? (xfrm_address_t
*)&hao
->addr
: NULL
));
274 static int mip6_destopt_offset(struct xfrm_state
*x
, struct sk_buff
*skb
,
277 u16 offset
= sizeof(struct ipv6hdr
);
278 struct ipv6_opt_hdr
*exthdr
= (struct ipv6_opt_hdr
*)(skb
->nh
.ipv6h
+ 1);
279 unsigned int packet_len
= skb
->tail
- skb
->nh
.raw
;
282 *nexthdr
= &skb
->nh
.ipv6h
->nexthdr
;
284 while (offset
+ 1 <= packet_len
) {
289 case NEXTHDR_ROUTING
:
294 * HAO MUST NOT appear more than once.
295 * XXX: It is better to try to find by the end of
296 * XXX: packet if HAO exists.
298 if (ipv6_find_tlv(skb
, offset
, IPV6_TLV_HAO
) >= 0) {
299 LIMIT_NETDEBUG(KERN_WARNING
"mip6: hao exists already, override\n");
311 offset
+= ipv6_optlen(exthdr
);
312 *nexthdr
= &exthdr
->nexthdr
;
313 exthdr
= (struct ipv6_opt_hdr
*)(skb
->nh
.raw
+ offset
);
319 static int mip6_destopt_init_state(struct xfrm_state
*x
)
322 printk(KERN_INFO
"%s: spi is not 0: %u\n", __FUNCTION__
,
326 if (x
->props
.mode
!= XFRM_MODE_ROUTEOPTIMIZATION
) {
327 printk(KERN_INFO
"%s: state's mode is not %u: %u\n",
328 __FUNCTION__
, XFRM_MODE_ROUTEOPTIMIZATION
, x
->props
.mode
);
332 x
->props
.header_len
= sizeof(struct ipv6_destopt_hdr
) +
333 calc_padlen(sizeof(struct ipv6_destopt_hdr
), 6) +
334 sizeof(struct ipv6_destopt_hao
);
335 BUG_TRAP(x
->props
.header_len
== 24);
341 * Do nothing about destroying since it has no specific operation for
342 * destination options header unlike IPsec protocols.
344 static void mip6_destopt_destroy(struct xfrm_state
*x
)
348 static struct xfrm_type mip6_destopt_type
=
350 .description
= "MIP6DESTOPT",
351 .owner
= THIS_MODULE
,
352 .proto
= IPPROTO_DSTOPTS
,
353 .flags
= XFRM_TYPE_NON_FRAGMENT
,
354 .init_state
= mip6_destopt_init_state
,
355 .destructor
= mip6_destopt_destroy
,
356 .input
= mip6_destopt_input
,
357 .output
= mip6_destopt_output
,
358 .reject
= mip6_destopt_reject
,
359 .hdr_offset
= mip6_destopt_offset
,
360 .local_addr
= mip6_xfrm_addr
,
363 static int mip6_rthdr_input(struct xfrm_state
*x
, struct sk_buff
*skb
)
365 struct rt2_hdr
*rt2
= (struct rt2_hdr
*)skb
->data
;
367 if (!ipv6_addr_equal(&rt2
->addr
, (struct in6_addr
*)x
->coaddr
) &&
368 !ipv6_addr_any((struct in6_addr
*)x
->coaddr
))
371 return rt2
->rt_hdr
.nexthdr
;
374 /* Routing Header type 2 is inserted.
375 * IP Header's dst address is replaced with Routing Header's Home Address.
377 static int mip6_rthdr_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
383 iph
= (struct ipv6hdr
*)skb
->data
;
384 iph
->payload_len
= htons(skb
->len
- sizeof(*iph
));
386 nexthdr
= *skb
->nh
.raw
;
387 *skb
->nh
.raw
= IPPROTO_ROUTING
;
389 rt2
= (struct rt2_hdr
*)skb
->h
.raw
;
390 rt2
->rt_hdr
.nexthdr
= nexthdr
;
391 rt2
->rt_hdr
.hdrlen
= (x
->props
.header_len
>> 3) - 1;
392 rt2
->rt_hdr
.type
= IPV6_SRCRT_TYPE_2
;
393 rt2
->rt_hdr
.segments_left
= 1;
394 memset(&rt2
->reserved
, 0, sizeof(rt2
->reserved
));
396 BUG_TRAP(rt2
->rt_hdr
.hdrlen
== 2);
398 memcpy(&rt2
->addr
, &iph
->daddr
, sizeof(rt2
->addr
));
399 memcpy(&iph
->daddr
, x
->coaddr
, sizeof(iph
->daddr
));
404 static int mip6_rthdr_offset(struct xfrm_state
*x
, struct sk_buff
*skb
,
407 u16 offset
= sizeof(struct ipv6hdr
);
408 struct ipv6_opt_hdr
*exthdr
= (struct ipv6_opt_hdr
*)(skb
->nh
.ipv6h
+ 1);
409 unsigned int packet_len
= skb
->tail
- skb
->nh
.raw
;
412 *nexthdr
= &skb
->nh
.ipv6h
->nexthdr
;
414 while (offset
+ 1 <= packet_len
) {
419 case NEXTHDR_ROUTING
:
420 if (offset
+ 3 <= packet_len
) {
421 struct ipv6_rt_hdr
*rt
;
422 rt
= (struct ipv6_rt_hdr
*)(skb
->nh
.raw
+ offset
);
429 if (ipv6_find_tlv(skb
, offset
, IPV6_TLV_HAO
) >= 0)
440 offset
+= ipv6_optlen(exthdr
);
441 *nexthdr
= &exthdr
->nexthdr
;
442 exthdr
= (struct ipv6_opt_hdr
*)(skb
->nh
.raw
+ offset
);
448 static int mip6_rthdr_init_state(struct xfrm_state
*x
)
451 printk(KERN_INFO
"%s: spi is not 0: %u\n", __FUNCTION__
,
455 if (x
->props
.mode
!= XFRM_MODE_ROUTEOPTIMIZATION
) {
456 printk(KERN_INFO
"%s: state's mode is not %u: %u\n",
457 __FUNCTION__
, XFRM_MODE_ROUTEOPTIMIZATION
, x
->props
.mode
);
461 x
->props
.header_len
= sizeof(struct rt2_hdr
);
467 * Do nothing about destroying since it has no specific operation for routing
468 * header type 2 unlike IPsec protocols.
470 static void mip6_rthdr_destroy(struct xfrm_state
*x
)
474 static struct xfrm_type mip6_rthdr_type
=
476 .description
= "MIP6RT",
477 .owner
= THIS_MODULE
,
478 .proto
= IPPROTO_ROUTING
,
479 .flags
= XFRM_TYPE_NON_FRAGMENT
,
480 .init_state
= mip6_rthdr_init_state
,
481 .destructor
= mip6_rthdr_destroy
,
482 .input
= mip6_rthdr_input
,
483 .output
= mip6_rthdr_output
,
484 .hdr_offset
= mip6_rthdr_offset
,
485 .remote_addr
= mip6_xfrm_addr
,
488 int __init
mip6_init(void)
490 printk(KERN_INFO
"Mobile IPv6\n");
492 if (xfrm_register_type(&mip6_destopt_type
, AF_INET6
) < 0) {
493 printk(KERN_INFO
"%s: can't add xfrm type(destopt)\n", __FUNCTION__
);
494 goto mip6_destopt_xfrm_fail
;
496 if (xfrm_register_type(&mip6_rthdr_type
, AF_INET6
) < 0) {
497 printk(KERN_INFO
"%s: can't add xfrm type(rthdr)\n", __FUNCTION__
);
498 goto mip6_rthdr_xfrm_fail
;
502 mip6_rthdr_xfrm_fail
:
503 xfrm_unregister_type(&mip6_destopt_type
, AF_INET6
);
504 mip6_destopt_xfrm_fail
:
508 void __exit
mip6_fini(void)
510 if (xfrm_unregister_type(&mip6_rthdr_type
, AF_INET6
) < 0)
511 printk(KERN_INFO
"%s: can't remove xfrm type(rthdr)\n", __FUNCTION__
);
512 if (xfrm_unregister_type(&mip6_destopt_type
, AF_INET6
) < 0)
513 printk(KERN_INFO
"%s: can't remove xfrm type(destopt)\n", __FUNCTION__
);