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Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -07001/*
2 * Copyright (C)2003-2006 Helsinki University of Technology
3 * Copyright (C)2003-2006 USAGI/WIDE Project
4 *
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.
9 *
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.
14 *
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
18 */
19/*
20 * Authors:
21 * Noriaki TAKAMIYA @USAGI
22 * Masahide NAKAMURA @USAGI
23 */
24
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -070025#include <linux/module.h>
26#include <linux/skbuff.h>
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -070027#include <linux/time.h>
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -070028#include <linux/ipv6.h>
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070029#include <linux/icmpv6.h>
30#include <net/sock.h>
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -070031#include <net/ipv6.h>
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070032#include <net/ip6_checksum.h>
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -070033#include <net/rawv6.h>
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -070034#include <net/xfrm.h>
35#include <net/mip6.h>
36
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -070037static inline unsigned int calc_padlen(unsigned int len, unsigned int n)
38{
39 return (n - len + 16) & 0x7;
40}
41
42static inline void *mip6_padn(__u8 *data, __u8 padlen)
43{
44 if (!data)
45 return NULL;
46 if (padlen == 1) {
YOSHIFUJI Hideaki7f1eced2008-04-10 15:42:12 +090047 data[0] = IPV6_TLV_PAD0;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -070048 } else if (padlen > 1) {
YOSHIFUJI Hideaki7f1eced2008-04-10 15:42:12 +090049 data[0] = IPV6_TLV_PADN;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -070050 data[1] = padlen - 2;
51 if (padlen > 2)
52 memset(data+2, 0, data[1]);
53 }
54 return data + padlen;
55}
56
Brian Haleyd5fdd6b2009-06-23 04:31:07 -070057static inline void mip6_param_prob(struct sk_buff *skb, u8 code, int pos)
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070058{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +000059 icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos);
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070060}
61
62static int mip6_mh_len(int type)
63{
64 int len = 0;
65
66 switch (type) {
67 case IP6_MH_TYPE_BRR:
68 len = 0;
69 break;
70 case IP6_MH_TYPE_HOTI:
71 case IP6_MH_TYPE_COTI:
72 case IP6_MH_TYPE_BU:
73 case IP6_MH_TYPE_BACK:
74 len = 1;
75 break;
76 case IP6_MH_TYPE_HOT:
77 case IP6_MH_TYPE_COT:
78 case IP6_MH_TYPE_BERROR:
79 len = 2;
80 break;
81 }
82 return len;
83}
84
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -070085static int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070086{
87 struct ip6_mh *mh;
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070088
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -070089 if (!pskb_may_pull(skb, (skb_transport_offset(skb)) + 8) ||
90 !pskb_may_pull(skb, (skb_transport_offset(skb) +
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -070091 ((skb_transport_header(skb)[1] + 1) << 3))))
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070092 return -1;
93
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -070094 mh = (struct ip6_mh *)skb_transport_header(skb);
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070095
96 if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) {
97 LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH message too short: %d vs >=%d\n",
98 mh->ip6mh_hdrlen, mip6_mh_len(mh->ip6mh_type));
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070099 mip6_param_prob(skb, 0, ((&mh->ip6mh_hdrlen) -
100 skb_network_header(skb)));
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -0700101 return -1;
102 }
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -0700103
104 if (mh->ip6mh_proto != IPPROTO_NONE) {
105 LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH invalid payload proto = %d\n",
106 mh->ip6mh_proto);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700107 mip6_param_prob(skb, 0, ((&mh->ip6mh_proto) -
108 skb_network_header(skb)));
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -0700109 return -1;
110 }
111
112 return 0;
113}
114
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700115struct mip6_report_rate_limiter {
116 spinlock_t lock;
117 struct timeval stamp;
118 int iif;
119 struct in6_addr src;
120 struct in6_addr dst;
121};
122
123static struct mip6_report_rate_limiter mip6_report_rl = {
Milind Arun Choudhary4ef8d0a2007-04-26 01:37:44 -0700124 .lock = __SPIN_LOCK_UNLOCKED(mip6_report_rl.lock)
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700125};
126
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700127static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb)
128{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700129 struct ipv6hdr *iph = ipv6_hdr(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700130 struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data;
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800131 int err = destopt->nexthdr;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700132
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800133 spin_lock(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700134 if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) &&
135 !ipv6_addr_any((struct in6_addr *)x->coaddr))
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800136 err = -ENOENT;
137 spin_unlock(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700138
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800139 return err;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700140}
141
142/* Destination Option Header is inserted.
143 * IP Header's src address is replaced with Home Address Option in
144 * Destination Option Header.
145 */
146static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
147{
148 struct ipv6hdr *iph;
149 struct ipv6_destopt_hdr *dstopt;
150 struct ipv6_destopt_hao *hao;
151 u8 nexthdr;
152 int len;
153
Herbert Xu7b277b12007-10-10 15:44:06 -0700154 skb_push(skb, -skb_network_offset(skb));
Herbert Xu007f0212007-10-09 13:25:59 -0700155 iph = ipv6_hdr(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700156
Herbert Xu007f0212007-10-09 13:25:59 -0700157 nexthdr = *skb_mac_header(skb);
158 *skb_mac_header(skb) = IPPROTO_DSTOPTS;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700159
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700160 dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700161 dstopt->nexthdr = nexthdr;
162
163 hao = mip6_padn((char *)(dstopt + 1),
164 calc_padlen(sizeof(*dstopt), 6));
165
166 hao->type = IPV6_TLV_HAO;
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700167 BUILD_BUG_ON(sizeof(*hao) != 18);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700168 hao->length = sizeof(*hao) - 2;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700169
170 len = ((char *)hao - (char *)dstopt) + sizeof(*hao);
171
172 memcpy(&hao->addr, &iph->saddr, sizeof(hao->addr));
Herbert Xub7c65382007-10-09 13:33:35 -0700173 spin_lock_bh(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700174 memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr));
Herbert Xub7c65382007-10-09 13:33:35 -0700175 spin_unlock_bh(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700176
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700177 WARN_ON(len != x->props.header_len);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700178 dstopt->hdrlen = (x->props.header_len >> 3) - 1;
179
180 return 0;
181}
182
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700183static inline int mip6_report_rl_allow(struct timeval *stamp,
184 struct in6_addr *dst,
185 struct in6_addr *src, int iif)
186{
187 int allow = 0;
188
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);
200 allow = 1;
201 }
202 spin_unlock_bh(&mip6_report_rl.lock);
203 return allow;
204}
205
206static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb, struct flowi *fl)
207{
Alexey Dobriyandb983c12008-11-25 17:51:01 -0800208 struct net *net = xs_net(x);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700209 struct inet6_skb_parm *opt = (struct inet6_skb_parm *)skb->cb;
210 struct ipv6_destopt_hao *hao = NULL;
211 struct xfrm_selector sel;
212 int offset;
213 struct timeval stamp;
214 int err = 0;
215
YOSHIFUJI Hideakie731c242006-08-24 23:18:12 +0900216 if (unlikely(fl->proto == IPPROTO_MH &&
217 fl->fl_mh_type <= IP6_MH_TYPE_MAX))
Masahide NAKAMURA01be8e52006-08-23 20:47:44 -0700218 goto out;
219
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700220 if (likely(opt->dsthao)) {
221 offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
222 if (likely(offset >= 0))
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700223 hao = (struct ipv6_destopt_hao *)
224 (skb_network_header(skb) + offset);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700225 }
226
227 skb_get_timestamp(skb, &stamp);
228
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700229 if (!mip6_report_rl_allow(&stamp, &ipv6_hdr(skb)->daddr,
230 hao ? &hao->addr : &ipv6_hdr(skb)->saddr,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700231 opt->iif))
232 goto out;
233
234 memset(&sel, 0, sizeof(sel));
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700235 memcpy(&sel.daddr, (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700236 sizeof(sel.daddr));
237 sel.prefixlen_d = 128;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700238 memcpy(&sel.saddr, (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700239 sizeof(sel.saddr));
240 sel.prefixlen_s = 128;
241 sel.family = AF_INET6;
242 sel.proto = fl->proto;
243 sel.dport = xfrm_flowi_dport(fl);
244 if (sel.dport)
Al Viroe69a4adc2006-11-14 20:56:00 -0800245 sel.dport_mask = htons(~0);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700246 sel.sport = xfrm_flowi_sport(fl);
247 if (sel.sport)
Al Viroe69a4adc2006-11-14 20:56:00 -0800248 sel.sport_mask = htons(~0);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700249 sel.ifindex = fl->oif;
250
Alexey Dobriyandb983c12008-11-25 17:51:01 -0800251 err = km_report(net, IPPROTO_DSTOPTS, &sel,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700252 (hao ? (xfrm_address_t *)&hao->addr : NULL));
253
254 out:
255 return err;
256}
257
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700258static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb,
259 u8 **nexthdr)
260{
261 u16 offset = sizeof(struct ipv6hdr);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700262 struct ipv6_opt_hdr *exthdr =
263 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700264 const unsigned char *nh = skb_network_header(skb);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700265 unsigned int packet_len = skb->tail - skb->network_header;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700266 int found_rhdr = 0;
267
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700268 *nexthdr = &ipv6_hdr(skb)->nexthdr;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700269
270 while (offset + 1 <= packet_len) {
271
272 switch (**nexthdr) {
273 case NEXTHDR_HOP:
274 break;
275 case NEXTHDR_ROUTING:
276 found_rhdr = 1;
277 break;
278 case NEXTHDR_DEST:
279 /*
280 * HAO MUST NOT appear more than once.
281 * XXX: It is better to try to find by the end of
282 * XXX: packet if HAO exists.
283 */
284 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
285 LIMIT_NETDEBUG(KERN_WARNING "mip6: hao exists already, override\n");
286 return offset;
287 }
288
289 if (found_rhdr)
290 return offset;
291
292 break;
293 default:
294 return offset;
295 }
296
297 offset += ipv6_optlen(exthdr);
298 *nexthdr = &exthdr->nexthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700299 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700300 }
301
302 return offset;
303}
304
305static int mip6_destopt_init_state(struct xfrm_state *x)
306{
307 if (x->id.spi) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800308 printk(KERN_INFO "%s: spi is not 0: %u\n", __func__,
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700309 x->id.spi);
310 return -EINVAL;
311 }
312 if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
313 printk(KERN_INFO "%s: state's mode is not %u: %u\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800314 __func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700315 return -EINVAL;
316 }
317
318 x->props.header_len = sizeof(struct ipv6_destopt_hdr) +
319 calc_padlen(sizeof(struct ipv6_destopt_hdr), 6) +
320 sizeof(struct ipv6_destopt_hao);
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700321 WARN_ON(x->props.header_len != 24);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700322
323 return 0;
324}
325
326/*
327 * Do nothing about destroying since it has no specific operation for
328 * destination options header unlike IPsec protocols.
329 */
330static void mip6_destopt_destroy(struct xfrm_state *x)
331{
332}
333
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800334static const struct xfrm_type mip6_destopt_type =
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700335{
336 .description = "MIP6DESTOPT",
337 .owner = THIS_MODULE,
338 .proto = IPPROTO_DSTOPTS,
Herbert Xuf04e7e82007-11-13 21:36:51 -0800339 .flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_LOCAL_COADDR,
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700340 .init_state = mip6_destopt_init_state,
341 .destructor = mip6_destopt_destroy,
342 .input = mip6_destopt_input,
343 .output = mip6_destopt_output,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900344 .reject = mip6_destopt_reject,
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700345 .hdr_offset = mip6_destopt_offset,
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700346};
347
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700348static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb)
349{
Arnaud Ebalardd9a9dc62010-07-16 00:38:44 +0000350 struct ipv6hdr *iph = ipv6_hdr(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700351 struct rt2_hdr *rt2 = (struct rt2_hdr *)skb->data;
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800352 int err = rt2->rt_hdr.nexthdr;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700353
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800354 spin_lock(&x->lock);
Arnaud Ebalardd9a9dc62010-07-16 00:38:44 +0000355 if (!ipv6_addr_equal(&iph->daddr, (struct in6_addr *)x->coaddr) &&
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700356 !ipv6_addr_any((struct in6_addr *)x->coaddr))
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800357 err = -ENOENT;
358 spin_unlock(&x->lock);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700359
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800360 return err;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700361}
362
363/* Routing Header type 2 is inserted.
364 * IP Header's dst address is replaced with Routing Header's Home Address.
365 */
366static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
367{
368 struct ipv6hdr *iph;
369 struct rt2_hdr *rt2;
370 u8 nexthdr;
371
Herbert Xu7b277b12007-10-10 15:44:06 -0700372 skb_push(skb, -skb_network_offset(skb));
Herbert Xu007f0212007-10-09 13:25:59 -0700373 iph = ipv6_hdr(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700374
Herbert Xu007f0212007-10-09 13:25:59 -0700375 nexthdr = *skb_mac_header(skb);
376 *skb_mac_header(skb) = IPPROTO_ROUTING;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700377
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700378 rt2 = (struct rt2_hdr *)skb_transport_header(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700379 rt2->rt_hdr.nexthdr = nexthdr;
380 rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
381 rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
382 rt2->rt_hdr.segments_left = 1;
383 memset(&rt2->reserved, 0, sizeof(rt2->reserved));
384
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700385 WARN_ON(rt2->rt_hdr.hdrlen != 2);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700386
387 memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr));
Herbert Xub7c65382007-10-09 13:33:35 -0700388 spin_lock_bh(&x->lock);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700389 memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr));
Herbert Xub7c65382007-10-09 13:33:35 -0700390 spin_unlock_bh(&x->lock);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700391
392 return 0;
393}
394
395static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
396 u8 **nexthdr)
397{
398 u16 offset = sizeof(struct ipv6hdr);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700399 struct ipv6_opt_hdr *exthdr =
400 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700401 const unsigned char *nh = skb_network_header(skb);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700402 unsigned int packet_len = skb->tail - skb->network_header;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700403 int found_rhdr = 0;
404
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700405 *nexthdr = &ipv6_hdr(skb)->nexthdr;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700406
407 while (offset + 1 <= packet_len) {
408
409 switch (**nexthdr) {
410 case NEXTHDR_HOP:
411 break;
412 case NEXTHDR_ROUTING:
413 if (offset + 3 <= packet_len) {
414 struct ipv6_rt_hdr *rt;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700415 rt = (struct ipv6_rt_hdr *)(nh + offset);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700416 if (rt->type != 0)
417 return offset;
418 }
419 found_rhdr = 1;
420 break;
421 case NEXTHDR_DEST:
422 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
423 return offset;
424
425 if (found_rhdr)
426 return offset;
427
428 break;
429 default:
430 return offset;
431 }
432
433 offset += ipv6_optlen(exthdr);
434 *nexthdr = &exthdr->nexthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700435 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700436 }
437
438 return offset;
439}
440
441static int mip6_rthdr_init_state(struct xfrm_state *x)
442{
443 if (x->id.spi) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800444 printk(KERN_INFO "%s: spi is not 0: %u\n", __func__,
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700445 x->id.spi);
446 return -EINVAL;
447 }
448 if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
449 printk(KERN_INFO "%s: state's mode is not %u: %u\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800450 __func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700451 return -EINVAL;
452 }
453
454 x->props.header_len = sizeof(struct rt2_hdr);
455
456 return 0;
457}
458
459/*
460 * Do nothing about destroying since it has no specific operation for routing
461 * header type 2 unlike IPsec protocols.
462 */
463static void mip6_rthdr_destroy(struct xfrm_state *x)
464{
465}
466
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800467static const struct xfrm_type mip6_rthdr_type =
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700468{
469 .description = "MIP6RT",
470 .owner = THIS_MODULE,
471 .proto = IPPROTO_ROUTING,
Herbert Xuf04e7e82007-11-13 21:36:51 -0800472 .flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_REMOTE_COADDR,
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700473 .init_state = mip6_rthdr_init_state,
474 .destructor = mip6_rthdr_destroy,
475 .input = mip6_rthdr_input,
476 .output = mip6_rthdr_output,
477 .hdr_offset = mip6_rthdr_offset,
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700478};
479
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700480static int __init mip6_init(void)
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700481{
482 printk(KERN_INFO "Mobile IPv6\n");
483
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700484 if (xfrm_register_type(&mip6_destopt_type, AF_INET6) < 0) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800485 printk(KERN_INFO "%s: can't add xfrm type(destopt)\n", __func__);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700486 goto mip6_destopt_xfrm_fail;
487 }
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700488 if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800489 printk(KERN_INFO "%s: can't add xfrm type(rthdr)\n", __func__);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700490 goto mip6_rthdr_xfrm_fail;
491 }
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700492 if (rawv6_mh_filter_register(mip6_mh_filter) < 0) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800493 printk(KERN_INFO "%s: can't add rawv6 mh filter\n", __func__);
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700494 goto mip6_rawv6_mh_fail;
495 }
496
497
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700498 return 0;
499
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700500 mip6_rawv6_mh_fail:
501 xfrm_unregister_type(&mip6_rthdr_type, AF_INET6);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700502 mip6_rthdr_xfrm_fail:
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700503 xfrm_unregister_type(&mip6_destopt_type, AF_INET6);
504 mip6_destopt_xfrm_fail:
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700505 return -EAGAIN;
506}
507
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700508static void __exit mip6_fini(void)
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700509{
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700510 if (rawv6_mh_filter_unregister(mip6_mh_filter) < 0)
Harvey Harrison0dc47872008-03-05 20:47:47 -0800511 printk(KERN_INFO "%s: can't remove rawv6 mh filter\n", __func__);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700512 if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0)
Harvey Harrison0dc47872008-03-05 20:47:47 -0800513 printk(KERN_INFO "%s: can't remove xfrm type(rthdr)\n", __func__);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700514 if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0)
Harvey Harrison0dc47872008-03-05 20:47:47 -0800515 printk(KERN_INFO "%s: can't remove xfrm type(destopt)\n", __func__);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700516}
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700517
518module_init(mip6_init);
519module_exit(mip6_fini);
520
521MODULE_LICENSE("GPL");
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -0700522MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_DSTOPTS);
523MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ROUTING);