blob: db9b6cbc9db3905695888343912be7dfd06af6f2 [file] [log] [blame]
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
Jeff Kirshera99421d2013-12-06 09:13:39 -080016 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -070017 */
18/*
19 * Authors:
20 * Noriaki TAKAMIYA @USAGI
21 * Masahide NAKAMURA @USAGI
22 */
23
Joe Perchesf3213832012-05-15 14:11:53 +000024#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -070026#include <linux/module.h>
27#include <linux/skbuff.h>
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -070028#include <linux/time.h>
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -070029#include <linux/ipv6.h>
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070030#include <linux/icmpv6.h>
31#include <net/sock.h>
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -070032#include <net/ipv6.h>
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070033#include <net/ip6_checksum.h>
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -070034#include <net/rawv6.h>
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -070035#include <net/xfrm.h>
36#include <net/mip6.h>
37
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -070038static inline unsigned int calc_padlen(unsigned int len, unsigned int n)
39{
40 return (n - len + 16) & 0x7;
41}
42
43static inline void *mip6_padn(__u8 *data, __u8 padlen)
44{
45 if (!data)
46 return NULL;
47 if (padlen == 1) {
Eldad Zack1de5a712012-05-17 06:00:25 +000048 data[0] = IPV6_TLV_PAD1;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -070049 } else if (padlen > 1) {
YOSHIFUJI Hideaki7f1eced2008-04-10 15:42:12 +090050 data[0] = IPV6_TLV_PADN;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -070051 data[1] = padlen - 2;
52 if (padlen > 2)
53 memset(data+2, 0, data[1]);
54 }
55 return data + padlen;
56}
57
Brian Haleyd5fdd6b2009-06-23 04:31:07 -070058static inline void mip6_param_prob(struct sk_buff *skb, u8 code, int pos)
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070059{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +000060 icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos);
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070061}
62
63static int mip6_mh_len(int type)
64{
65 int len = 0;
66
67 switch (type) {
68 case IP6_MH_TYPE_BRR:
69 len = 0;
70 break;
71 case IP6_MH_TYPE_HOTI:
72 case IP6_MH_TYPE_COTI:
73 case IP6_MH_TYPE_BU:
74 case IP6_MH_TYPE_BACK:
75 len = 1;
76 break;
77 case IP6_MH_TYPE_HOT:
78 case IP6_MH_TYPE_COT:
79 case IP6_MH_TYPE_BERROR:
80 len = 2;
81 break;
82 }
83 return len;
84}
85
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -070086static int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070087{
Eric Dumazet96af69e2012-09-25 22:01:28 +020088 struct ip6_mh _hdr;
89 const struct ip6_mh *mh;
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070090
Eric Dumazet96af69e2012-09-25 22:01:28 +020091 mh = skb_header_pointer(skb, skb_transport_offset(skb),
92 sizeof(_hdr), &_hdr);
93 if (!mh)
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070094 return -1;
95
Eric Dumazet96af69e2012-09-25 22:01:28 +020096 if (((mh->ip6mh_hdrlen + 1) << 3) > skb->len)
97 return -1;
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -070098
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));
Eric Dumazet96af69e2012-09-25 22:01:28 +0200102 mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_hdrlen) +
103 skb_network_header_len(skb));
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -0700104 return -1;
105 }
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -0700106
107 if (mh->ip6mh_proto != IPPROTO_NONE) {
108 LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH invalid payload proto = %d\n",
109 mh->ip6mh_proto);
Eric Dumazet96af69e2012-09-25 22:01:28 +0200110 mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_proto) +
111 skb_network_header_len(skb));
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -0700112 return -1;
113 }
114
115 return 0;
116}
117
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700118struct mip6_report_rate_limiter {
119 spinlock_t lock;
120 struct timeval stamp;
121 int iif;
122 struct in6_addr src;
123 struct in6_addr dst;
124};
125
126static struct mip6_report_rate_limiter mip6_report_rl = {
Milind Arun Choudhary4ef8d0a2007-04-26 01:37:44 -0700127 .lock = __SPIN_LOCK_UNLOCKED(mip6_report_rl.lock)
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700128};
129
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700130static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb)
131{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000132 const struct ipv6hdr *iph = ipv6_hdr(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700133 struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data;
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800134 int err = destopt->nexthdr;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700135
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800136 spin_lock(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700137 if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) &&
138 !ipv6_addr_any((struct in6_addr *)x->coaddr))
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800139 err = -ENOENT;
140 spin_unlock(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700141
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800142 return err;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700143}
144
145/* Destination Option Header is inserted.
146 * IP Header's src address is replaced with Home Address Option in
147 * Destination Option Header.
148 */
149static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
150{
151 struct ipv6hdr *iph;
152 struct ipv6_destopt_hdr *dstopt;
153 struct ipv6_destopt_hao *hao;
154 u8 nexthdr;
155 int len;
156
Herbert Xu7b277b12007-10-10 15:44:06 -0700157 skb_push(skb, -skb_network_offset(skb));
Herbert Xu007f0212007-10-09 13:25:59 -0700158 iph = ipv6_hdr(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700159
Herbert Xu007f0212007-10-09 13:25:59 -0700160 nexthdr = *skb_mac_header(skb);
161 *skb_mac_header(skb) = IPPROTO_DSTOPTS;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700162
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700163 dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700164 dstopt->nexthdr = nexthdr;
165
166 hao = mip6_padn((char *)(dstopt + 1),
167 calc_padlen(sizeof(*dstopt), 6));
168
169 hao->type = IPV6_TLV_HAO;
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700170 BUILD_BUG_ON(sizeof(*hao) != 18);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700171 hao->length = sizeof(*hao) - 2;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700172
173 len = ((char *)hao - (char *)dstopt) + sizeof(*hao);
174
175 memcpy(&hao->addr, &iph->saddr, sizeof(hao->addr));
Herbert Xub7c65382007-10-09 13:33:35 -0700176 spin_lock_bh(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700177 memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr));
Herbert Xub7c65382007-10-09 13:33:35 -0700178 spin_unlock_bh(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700179
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700180 WARN_ON(len != x->props.header_len);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700181 dstopt->hdrlen = (x->props.header_len >> 3) - 1;
182
183 return 0;
184}
185
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700186static inline int mip6_report_rl_allow(struct timeval *stamp,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000187 const struct in6_addr *dst,
188 const struct in6_addr *src, int iif)
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700189{
190 int allow = 0;
191
192 spin_lock_bh(&mip6_report_rl.lock);
193 if (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_equal(&mip6_report_rl.src, src) ||
197 !ipv6_addr_equal(&mip6_report_rl.dst, dst)) {
198 mip6_report_rl.stamp.tv_sec = stamp->tv_sec;
199 mip6_report_rl.stamp.tv_usec = stamp->tv_usec;
200 mip6_report_rl.iif = iif;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000201 mip6_report_rl.src = *src;
202 mip6_report_rl.dst = *dst;
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700203 allow = 1;
204 }
205 spin_unlock_bh(&mip6_report_rl.lock);
206 return allow;
207}
208
David S. Miller8f029de2011-02-22 17:59:59 -0800209static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb,
210 const struct flowi *fl)
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700211{
Alexey Dobriyandb983c12008-11-25 17:51:01 -0800212 struct net *net = xs_net(x);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700213 struct inet6_skb_parm *opt = (struct inet6_skb_parm *)skb->cb;
David S. Miller4c9483b2011-03-12 16:22:43 -0500214 const struct flowi6 *fl6 = &fl->u.ip6;
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700215 struct ipv6_destopt_hao *hao = NULL;
216 struct xfrm_selector sel;
217 int offset;
218 struct timeval stamp;
219 int err = 0;
220
David S. Miller4c9483b2011-03-12 16:22:43 -0500221 if (unlikely(fl6->flowi6_proto == IPPROTO_MH &&
David S. Miller1958b852011-03-12 16:36:19 -0500222 fl6->fl6_mh_type <= IP6_MH_TYPE_MAX))
Masahide NAKAMURA01be8e52006-08-23 20:47:44 -0700223 goto out;
224
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700225 if (likely(opt->dsthao)) {
226 offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
227 if (likely(offset >= 0))
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700228 hao = (struct ipv6_destopt_hao *)
229 (skb_network_header(skb) + offset);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700230 }
231
232 skb_get_timestamp(skb, &stamp);
233
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700234 if (!mip6_report_rl_allow(&stamp, &ipv6_hdr(skb)->daddr,
235 hao ? &hao->addr : &ipv6_hdr(skb)->saddr,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700236 opt->iif))
237 goto out;
238
239 memset(&sel, 0, sizeof(sel));
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700240 memcpy(&sel.daddr, (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700241 sizeof(sel.daddr));
242 sel.prefixlen_d = 128;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700243 memcpy(&sel.saddr, (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700244 sizeof(sel.saddr));
245 sel.prefixlen_s = 128;
246 sel.family = AF_INET6;
David S. Miller4c9483b2011-03-12 16:22:43 -0500247 sel.proto = fl6->flowi6_proto;
248 sel.dport = xfrm_flowi_dport(fl, &fl6->uli);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700249 if (sel.dport)
Al Viroe69a4adc2006-11-14 20:56:00 -0800250 sel.dport_mask = htons(~0);
David S. Miller4c9483b2011-03-12 16:22:43 -0500251 sel.sport = xfrm_flowi_sport(fl, &fl6->uli);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700252 if (sel.sport)
Al Viroe69a4adc2006-11-14 20:56:00 -0800253 sel.sport_mask = htons(~0);
David S. Miller4c9483b2011-03-12 16:22:43 -0500254 sel.ifindex = fl6->flowi6_oif;
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700255
Alexey Dobriyandb983c12008-11-25 17:51:01 -0800256 err = km_report(net, IPPROTO_DSTOPTS, &sel,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700257 (hao ? (xfrm_address_t *)&hao->addr : NULL));
258
259 out:
260 return err;
261}
262
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700263static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb,
264 u8 **nexthdr)
265{
266 u16 offset = sizeof(struct ipv6hdr);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700267 struct ipv6_opt_hdr *exthdr =
268 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700269 const unsigned char *nh = skb_network_header(skb);
Simon Horman29a3cad2013-05-28 20:34:26 +0000270 unsigned int packet_len = skb_tail_pointer(skb) -
271 skb_network_header(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700272 int found_rhdr = 0;
273
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700274 *nexthdr = &ipv6_hdr(skb)->nexthdr;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700275
276 while (offset + 1 <= packet_len) {
277
278 switch (**nexthdr) {
279 case NEXTHDR_HOP:
280 break;
281 case NEXTHDR_ROUTING:
282 found_rhdr = 1;
283 break;
284 case NEXTHDR_DEST:
285 /*
286 * HAO MUST NOT appear more than once.
287 * XXX: It is better to try to find by the end of
288 * XXX: packet if HAO exists.
289 */
290 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
291 LIMIT_NETDEBUG(KERN_WARNING "mip6: hao exists already, override\n");
292 return offset;
293 }
294
295 if (found_rhdr)
296 return offset;
297
298 break;
299 default:
300 return offset;
301 }
302
303 offset += ipv6_optlen(exthdr);
304 *nexthdr = &exthdr->nexthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700305 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700306 }
307
308 return offset;
309}
310
311static int mip6_destopt_init_state(struct xfrm_state *x)
312{
313 if (x->id.spi) {
Joe Perchesf3213832012-05-15 14:11:53 +0000314 pr_info("%s: spi is not 0: %u\n", __func__, x->id.spi);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700315 return -EINVAL;
316 }
317 if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
Joe Perchesf3213832012-05-15 14:11:53 +0000318 pr_info("%s: state's mode is not %u: %u\n",
319 __func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700320 return -EINVAL;
321 }
322
323 x->props.header_len = sizeof(struct ipv6_destopt_hdr) +
324 calc_padlen(sizeof(struct ipv6_destopt_hdr), 6) +
325 sizeof(struct ipv6_destopt_hao);
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700326 WARN_ON(x->props.header_len != 24);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700327
328 return 0;
329}
330
331/*
332 * Do nothing about destroying since it has no specific operation for
333 * destination options header unlike IPsec protocols.
334 */
335static void mip6_destopt_destroy(struct xfrm_state *x)
336{
337}
338
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800339static const struct xfrm_type mip6_destopt_type =
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700340{
341 .description = "MIP6DESTOPT",
342 .owner = THIS_MODULE,
343 .proto = IPPROTO_DSTOPTS,
Herbert Xuf04e7e82007-11-13 21:36:51 -0800344 .flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_LOCAL_COADDR,
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700345 .init_state = mip6_destopt_init_state,
346 .destructor = mip6_destopt_destroy,
347 .input = mip6_destopt_input,
348 .output = mip6_destopt_output,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900349 .reject = mip6_destopt_reject,
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700350 .hdr_offset = mip6_destopt_offset,
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700351};
352
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700353static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb)
354{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000355 const struct ipv6hdr *iph = ipv6_hdr(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700356 struct rt2_hdr *rt2 = (struct rt2_hdr *)skb->data;
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800357 int err = rt2->rt_hdr.nexthdr;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700358
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800359 spin_lock(&x->lock);
Arnaud Ebalardd9a9dc62010-07-16 00:38:44 +0000360 if (!ipv6_addr_equal(&iph->daddr, (struct in6_addr *)x->coaddr) &&
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700361 !ipv6_addr_any((struct in6_addr *)x->coaddr))
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800362 err = -ENOENT;
363 spin_unlock(&x->lock);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700364
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800365 return err;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700366}
367
368/* Routing Header type 2 is inserted.
369 * IP Header's dst address is replaced with Routing Header's Home Address.
370 */
371static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
372{
373 struct ipv6hdr *iph;
374 struct rt2_hdr *rt2;
375 u8 nexthdr;
376
Herbert Xu7b277b12007-10-10 15:44:06 -0700377 skb_push(skb, -skb_network_offset(skb));
Herbert Xu007f0212007-10-09 13:25:59 -0700378 iph = ipv6_hdr(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700379
Herbert Xu007f0212007-10-09 13:25:59 -0700380 nexthdr = *skb_mac_header(skb);
381 *skb_mac_header(skb) = IPPROTO_ROUTING;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700382
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700383 rt2 = (struct rt2_hdr *)skb_transport_header(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700384 rt2->rt_hdr.nexthdr = nexthdr;
385 rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
386 rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
387 rt2->rt_hdr.segments_left = 1;
388 memset(&rt2->reserved, 0, sizeof(rt2->reserved));
389
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700390 WARN_ON(rt2->rt_hdr.hdrlen != 2);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700391
392 memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr));
Herbert Xub7c65382007-10-09 13:33:35 -0700393 spin_lock_bh(&x->lock);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700394 memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr));
Herbert Xub7c65382007-10-09 13:33:35 -0700395 spin_unlock_bh(&x->lock);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700396
397 return 0;
398}
399
400static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
401 u8 **nexthdr)
402{
403 u16 offset = sizeof(struct ipv6hdr);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700404 struct ipv6_opt_hdr *exthdr =
405 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700406 const unsigned char *nh = skb_network_header(skb);
Simon Horman29a3cad2013-05-28 20:34:26 +0000407 unsigned int packet_len = skb_tail_pointer(skb) -
408 skb_network_header(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700409 int found_rhdr = 0;
410
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700411 *nexthdr = &ipv6_hdr(skb)->nexthdr;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700412
413 while (offset + 1 <= packet_len) {
414
415 switch (**nexthdr) {
416 case NEXTHDR_HOP:
417 break;
418 case NEXTHDR_ROUTING:
419 if (offset + 3 <= packet_len) {
420 struct ipv6_rt_hdr *rt;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700421 rt = (struct ipv6_rt_hdr *)(nh + offset);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700422 if (rt->type != 0)
423 return offset;
424 }
425 found_rhdr = 1;
426 break;
427 case NEXTHDR_DEST:
428 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
429 return offset;
430
431 if (found_rhdr)
432 return offset;
433
434 break;
435 default:
436 return offset;
437 }
438
439 offset += ipv6_optlen(exthdr);
440 *nexthdr = &exthdr->nexthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700441 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700442 }
443
444 return offset;
445}
446
447static int mip6_rthdr_init_state(struct xfrm_state *x)
448{
449 if (x->id.spi) {
Joe Perchesf3213832012-05-15 14:11:53 +0000450 pr_info("%s: spi is not 0: %u\n", __func__, x->id.spi);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700451 return -EINVAL;
452 }
453 if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
Joe Perchesf3213832012-05-15 14:11:53 +0000454 pr_info("%s: state's mode is not %u: %u\n",
455 __func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700456 return -EINVAL;
457 }
458
459 x->props.header_len = sizeof(struct rt2_hdr);
460
461 return 0;
462}
463
464/*
465 * Do nothing about destroying since it has no specific operation for routing
466 * header type 2 unlike IPsec protocols.
467 */
468static void mip6_rthdr_destroy(struct xfrm_state *x)
469{
470}
471
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800472static const struct xfrm_type mip6_rthdr_type =
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700473{
474 .description = "MIP6RT",
475 .owner = THIS_MODULE,
476 .proto = IPPROTO_ROUTING,
Herbert Xuf04e7e82007-11-13 21:36:51 -0800477 .flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_REMOTE_COADDR,
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700478 .init_state = mip6_rthdr_init_state,
479 .destructor = mip6_rthdr_destroy,
480 .input = mip6_rthdr_input,
481 .output = mip6_rthdr_output,
482 .hdr_offset = mip6_rthdr_offset,
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700483};
484
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700485static int __init mip6_init(void)
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700486{
Joe Perchesf3213832012-05-15 14:11:53 +0000487 pr_info("Mobile IPv6\n");
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700488
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700489 if (xfrm_register_type(&mip6_destopt_type, AF_INET6) < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +0000490 pr_info("%s: can't add xfrm type(destopt)\n", __func__);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700491 goto mip6_destopt_xfrm_fail;
492 }
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700493 if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +0000494 pr_info("%s: can't add xfrm type(rthdr)\n", __func__);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700495 goto mip6_rthdr_xfrm_fail;
496 }
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700497 if (rawv6_mh_filter_register(mip6_mh_filter) < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +0000498 pr_info("%s: can't add rawv6 mh filter\n", __func__);
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700499 goto mip6_rawv6_mh_fail;
500 }
501
502
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700503 return 0;
504
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700505 mip6_rawv6_mh_fail:
506 xfrm_unregister_type(&mip6_rthdr_type, AF_INET6);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700507 mip6_rthdr_xfrm_fail:
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700508 xfrm_unregister_type(&mip6_destopt_type, AF_INET6);
509 mip6_destopt_xfrm_fail:
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700510 return -EAGAIN;
511}
512
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700513static void __exit mip6_fini(void)
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700514{
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700515 if (rawv6_mh_filter_unregister(mip6_mh_filter) < 0)
Joe Perchesf3213832012-05-15 14:11:53 +0000516 pr_info("%s: can't remove rawv6 mh filter\n", __func__);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700517 if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0)
Joe Perchesf3213832012-05-15 14:11:53 +0000518 pr_info("%s: can't remove xfrm type(rthdr)\n", __func__);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700519 if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0)
Joe Perchesf3213832012-05-15 14:11:53 +0000520 pr_info("%s: can't remove xfrm type(destopt)\n", __func__);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700521}
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700522
523module_init(mip6_init);
524module_exit(mip6_fini);
525
526MODULE_LICENSE("GPL");
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -0700527MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_DSTOPTS);
528MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ROUTING);