blob: 64f0f7be9e5e267e9dc303c6b726d9b680e762a6 [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)) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800100 net_dbg_ratelimited("mip6: MH message too short: %d vs >=%d\n",
101 mh->ip6mh_hdrlen,
102 mip6_mh_len(mh->ip6mh_type));
Eric Dumazet96af69e2012-09-25 22:01:28 +0200103 mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_hdrlen) +
104 skb_network_header_len(skb));
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -0700105 return -1;
106 }
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -0700107
108 if (mh->ip6mh_proto != IPPROTO_NONE) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800109 net_dbg_ratelimited("mip6: MH invalid payload proto = %d\n",
110 mh->ip6mh_proto);
Eric Dumazet96af69e2012-09-25 22:01:28 +0200111 mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_proto) +
112 skb_network_header_len(skb));
Masahide NAKAMURA7be96f72006-08-23 20:35:31 -0700113 return -1;
114 }
115
116 return 0;
117}
118
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700119struct mip6_report_rate_limiter {
120 spinlock_t lock;
Arnd Bergmann3dd76692015-09-30 13:26:39 +0200121 ktime_t stamp;
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700122 int iif;
123 struct in6_addr src;
124 struct in6_addr dst;
125};
126
127static struct mip6_report_rate_limiter mip6_report_rl = {
Milind Arun Choudhary4ef8d0a2007-04-26 01:37:44 -0700128 .lock = __SPIN_LOCK_UNLOCKED(mip6_report_rl.lock)
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700129};
130
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700131static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb)
132{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000133 const struct ipv6hdr *iph = ipv6_hdr(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700134 struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data;
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800135 int err = destopt->nexthdr;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700136
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800137 spin_lock(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700138 if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) &&
139 !ipv6_addr_any((struct in6_addr *)x->coaddr))
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800140 err = -ENOENT;
141 spin_unlock(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700142
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800143 return err;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700144}
145
146/* Destination Option Header is inserted.
147 * IP Header's src address is replaced with Home Address Option in
148 * Destination Option Header.
149 */
150static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
151{
152 struct ipv6hdr *iph;
153 struct ipv6_destopt_hdr *dstopt;
154 struct ipv6_destopt_hao *hao;
155 u8 nexthdr;
156 int len;
157
Herbert Xu7b277b12007-10-10 15:44:06 -0700158 skb_push(skb, -skb_network_offset(skb));
Herbert Xu007f0212007-10-09 13:25:59 -0700159 iph = ipv6_hdr(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700160
Herbert Xu007f0212007-10-09 13:25:59 -0700161 nexthdr = *skb_mac_header(skb);
162 *skb_mac_header(skb) = IPPROTO_DSTOPTS;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700163
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700164 dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700165 dstopt->nexthdr = nexthdr;
166
167 hao = mip6_padn((char *)(dstopt + 1),
168 calc_padlen(sizeof(*dstopt), 6));
169
170 hao->type = IPV6_TLV_HAO;
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700171 BUILD_BUG_ON(sizeof(*hao) != 18);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700172 hao->length = sizeof(*hao) - 2;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700173
174 len = ((char *)hao - (char *)dstopt) + sizeof(*hao);
175
176 memcpy(&hao->addr, &iph->saddr, sizeof(hao->addr));
Herbert Xub7c65382007-10-09 13:33:35 -0700177 spin_lock_bh(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700178 memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr));
Herbert Xub7c65382007-10-09 13:33:35 -0700179 spin_unlock_bh(&x->lock);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700180
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700181 WARN_ON(len != x->props.header_len);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700182 dstopt->hdrlen = (x->props.header_len >> 3) - 1;
183
184 return 0;
185}
186
Arnd Bergmann3dd76692015-09-30 13:26:39 +0200187static inline int mip6_report_rl_allow(ktime_t stamp,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000188 const struct in6_addr *dst,
189 const struct in6_addr *src, int iif)
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700190{
191 int allow = 0;
192
193 spin_lock_bh(&mip6_report_rl.lock);
Thomas Gleixner1f3a8e42016-12-25 12:43:07 +0100194 if (mip6_report_rl.stamp != stamp ||
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700195 mip6_report_rl.iif != iif ||
196 !ipv6_addr_equal(&mip6_report_rl.src, src) ||
197 !ipv6_addr_equal(&mip6_report_rl.dst, dst)) {
Arnd Bergmann3dd76692015-09-30 13:26:39 +0200198 mip6_report_rl.stamp = stamp;
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700199 mip6_report_rl.iif = iif;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000200 mip6_report_rl.src = *src;
201 mip6_report_rl.dst = *dst;
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700202 allow = 1;
203 }
204 spin_unlock_bh(&mip6_report_rl.lock);
205 return allow;
206}
207
David S. Miller8f029de2011-02-22 17:59:59 -0800208static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb,
209 const struct flowi *fl)
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700210{
Alexey Dobriyandb983c12008-11-25 17:51:01 -0800211 struct net *net = xs_net(x);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700212 struct inet6_skb_parm *opt = (struct inet6_skb_parm *)skb->cb;
David S. Miller4c9483b2011-03-12 16:22:43 -0500213 const struct flowi6 *fl6 = &fl->u.ip6;
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700214 struct ipv6_destopt_hao *hao = NULL;
215 struct xfrm_selector sel;
216 int offset;
Arnd Bergmann3dd76692015-09-30 13:26:39 +0200217 ktime_t stamp;
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700218 int err = 0;
219
David S. Miller4c9483b2011-03-12 16:22:43 -0500220 if (unlikely(fl6->flowi6_proto == IPPROTO_MH &&
David S. Miller1958b852011-03-12 16:36:19 -0500221 fl6->fl6_mh_type <= IP6_MH_TYPE_MAX))
Masahide NAKAMURA01be8e52006-08-23 20:47:44 -0700222 goto out;
223
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700224 if (likely(opt->dsthao)) {
225 offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
226 if (likely(offset >= 0))
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700227 hao = (struct ipv6_destopt_hao *)
228 (skb_network_header(skb) + offset);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700229 }
230
Arnd Bergmann3dd76692015-09-30 13:26:39 +0200231 stamp = skb_get_ktime(skb);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700232
Arnd Bergmann3dd76692015-09-30 13:26:39 +0200233 if (!mip6_report_rl_allow(stamp, &ipv6_hdr(skb)->daddr,
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700234 hao ? &hao->addr : &ipv6_hdr(skb)->saddr,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700235 opt->iif))
236 goto out;
237
238 memset(&sel, 0, sizeof(sel));
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700239 memcpy(&sel.daddr, (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700240 sizeof(sel.daddr));
241 sel.prefixlen_d = 128;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700242 memcpy(&sel.saddr, (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700243 sizeof(sel.saddr));
244 sel.prefixlen_s = 128;
245 sel.family = AF_INET6;
David S. Miller4c9483b2011-03-12 16:22:43 -0500246 sel.proto = fl6->flowi6_proto;
247 sel.dport = xfrm_flowi_dport(fl, &fl6->uli);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700248 if (sel.dport)
Al Viroe69a4adc2006-11-14 20:56:00 -0800249 sel.dport_mask = htons(~0);
David S. Miller4c9483b2011-03-12 16:22:43 -0500250 sel.sport = xfrm_flowi_sport(fl, &fl6->uli);
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700251 if (sel.sport)
Al Viroe69a4adc2006-11-14 20:56:00 -0800252 sel.sport_mask = htons(~0);
David S. Miller4c9483b2011-03-12 16:22:43 -0500253 sel.ifindex = fl6->flowi6_oif;
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700254
Alexey Dobriyandb983c12008-11-25 17:51:01 -0800255 err = km_report(net, IPPROTO_DSTOPTS, &sel,
Masahide NAKAMURA70182ed2006-08-23 20:45:55 -0700256 (hao ? (xfrm_address_t *)&hao->addr : NULL));
257
258 out:
259 return err;
260}
261
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700262static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb,
263 u8 **nexthdr)
264{
265 u16 offset = sizeof(struct ipv6hdr);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700266 struct ipv6_opt_hdr *exthdr =
267 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700268 const unsigned char *nh = skb_network_header(skb);
Simon Horman29a3cad2013-05-28 20:34:26 +0000269 unsigned int packet_len = skb_tail_pointer(skb) -
270 skb_network_header(skb);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700271 int found_rhdr = 0;
272
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700273 *nexthdr = &ipv6_hdr(skb)->nexthdr;
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700274
275 while (offset + 1 <= packet_len) {
276
277 switch (**nexthdr) {
278 case NEXTHDR_HOP:
279 break;
280 case NEXTHDR_ROUTING:
281 found_rhdr = 1;
282 break;
283 case NEXTHDR_DEST:
284 /*
285 * HAO MUST NOT appear more than once.
286 * XXX: It is better to try to find by the end of
287 * XXX: packet if HAO exists.
288 */
289 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800290 net_dbg_ratelimited("mip6: hao exists already, override\n");
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700291 return offset;
292 }
293
294 if (found_rhdr)
295 return offset;
296
297 break;
298 default:
299 return offset;
300 }
301
302 offset += ipv6_optlen(exthdr);
303 *nexthdr = &exthdr->nexthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700304 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700305 }
306
307 return offset;
308}
309
310static int mip6_destopt_init_state(struct xfrm_state *x)
311{
312 if (x->id.spi) {
Joe Perchesf3213832012-05-15 14:11:53 +0000313 pr_info("%s: spi is not 0: %u\n", __func__, x->id.spi);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700314 return -EINVAL;
315 }
316 if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
Joe Perchesf3213832012-05-15 14:11:53 +0000317 pr_info("%s: state's mode is not %u: %u\n",
318 __func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700319 return -EINVAL;
320 }
321
322 x->props.header_len = sizeof(struct ipv6_destopt_hdr) +
323 calc_padlen(sizeof(struct ipv6_destopt_hdr), 6) +
324 sizeof(struct ipv6_destopt_hao);
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700325 WARN_ON(x->props.header_len != 24);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700326
327 return 0;
328}
329
330/*
331 * Do nothing about destroying since it has no specific operation for
332 * destination options header unlike IPsec protocols.
333 */
334static void mip6_destopt_destroy(struct xfrm_state *x)
335{
336}
337
Ian Morriscc24bec2014-08-24 21:53:11 +0100338static const struct xfrm_type mip6_destopt_type = {
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700339 .description = "MIP6DESTOPT",
340 .owner = THIS_MODULE,
Ian Morriscc24bec2014-08-24 21:53:11 +0100341 .proto = IPPROTO_DSTOPTS,
Herbert Xuf04e7e82007-11-13 21:36:51 -0800342 .flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_LOCAL_COADDR,
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700343 .init_state = mip6_destopt_init_state,
344 .destructor = mip6_destopt_destroy,
345 .input = mip6_destopt_input,
346 .output = mip6_destopt_output,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900347 .reject = mip6_destopt_reject,
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700348 .hdr_offset = mip6_destopt_offset,
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700349};
350
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700351static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb)
352{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000353 const struct ipv6hdr *iph = ipv6_hdr(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700354 struct rt2_hdr *rt2 = (struct rt2_hdr *)skb->data;
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800355 int err = rt2->rt_hdr.nexthdr;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700356
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800357 spin_lock(&x->lock);
Arnaud Ebalardd9a9dc62010-07-16 00:38:44 +0000358 if (!ipv6_addr_equal(&iph->daddr, (struct in6_addr *)x->coaddr) &&
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700359 !ipv6_addr_any((struct in6_addr *)x->coaddr))
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800360 err = -ENOENT;
361 spin_unlock(&x->lock);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700362
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800363 return err;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700364}
365
366/* Routing Header type 2 is inserted.
367 * IP Header's dst address is replaced with Routing Header's Home Address.
368 */
369static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
370{
371 struct ipv6hdr *iph;
372 struct rt2_hdr *rt2;
373 u8 nexthdr;
374
Herbert Xu7b277b12007-10-10 15:44:06 -0700375 skb_push(skb, -skb_network_offset(skb));
Herbert Xu007f0212007-10-09 13:25:59 -0700376 iph = ipv6_hdr(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700377
Herbert Xu007f0212007-10-09 13:25:59 -0700378 nexthdr = *skb_mac_header(skb);
379 *skb_mac_header(skb) = IPPROTO_ROUTING;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700380
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700381 rt2 = (struct rt2_hdr *)skb_transport_header(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700382 rt2->rt_hdr.nexthdr = nexthdr;
383 rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
384 rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
385 rt2->rt_hdr.segments_left = 1;
386 memset(&rt2->reserved, 0, sizeof(rt2->reserved));
387
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700388 WARN_ON(rt2->rt_hdr.hdrlen != 2);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700389
390 memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr));
Herbert Xub7c65382007-10-09 13:33:35 -0700391 spin_lock_bh(&x->lock);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700392 memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr));
Herbert Xub7c65382007-10-09 13:33:35 -0700393 spin_unlock_bh(&x->lock);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700394
395 return 0;
396}
397
398static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
399 u8 **nexthdr)
400{
401 u16 offset = sizeof(struct ipv6hdr);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700402 struct ipv6_opt_hdr *exthdr =
403 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700404 const unsigned char *nh = skb_network_header(skb);
Simon Horman29a3cad2013-05-28 20:34:26 +0000405 unsigned int packet_len = skb_tail_pointer(skb) -
406 skb_network_header(skb);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700407 int found_rhdr = 0;
408
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700409 *nexthdr = &ipv6_hdr(skb)->nexthdr;
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700410
411 while (offset + 1 <= packet_len) {
412
413 switch (**nexthdr) {
414 case NEXTHDR_HOP:
415 break;
416 case NEXTHDR_ROUTING:
417 if (offset + 3 <= packet_len) {
418 struct ipv6_rt_hdr *rt;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700419 rt = (struct ipv6_rt_hdr *)(nh + offset);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700420 if (rt->type != 0)
421 return offset;
422 }
423 found_rhdr = 1;
424 break;
425 case NEXTHDR_DEST:
426 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
427 return offset;
428
429 if (found_rhdr)
430 return offset;
431
432 break;
433 default:
434 return offset;
435 }
436
437 offset += ipv6_optlen(exthdr);
438 *nexthdr = &exthdr->nexthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700439 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700440 }
441
442 return offset;
443}
444
445static int mip6_rthdr_init_state(struct xfrm_state *x)
446{
447 if (x->id.spi) {
Joe Perchesf3213832012-05-15 14:11:53 +0000448 pr_info("%s: spi is not 0: %u\n", __func__, x->id.spi);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700449 return -EINVAL;
450 }
451 if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
Joe Perchesf3213832012-05-15 14:11:53 +0000452 pr_info("%s: state's mode is not %u: %u\n",
453 __func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700454 return -EINVAL;
455 }
456
457 x->props.header_len = sizeof(struct rt2_hdr);
458
459 return 0;
460}
461
462/*
463 * Do nothing about destroying since it has no specific operation for routing
464 * header type 2 unlike IPsec protocols.
465 */
466static void mip6_rthdr_destroy(struct xfrm_state *x)
467{
468}
469
Ian Morriscc24bec2014-08-24 21:53:11 +0100470static const struct xfrm_type mip6_rthdr_type = {
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700471 .description = "MIP6RT",
472 .owner = THIS_MODULE,
Ian Morriscc24bec2014-08-24 21:53:11 +0100473 .proto = IPPROTO_ROUTING,
Herbert Xuf04e7e82007-11-13 21:36:51 -0800474 .flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_REMOTE_COADDR,
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700475 .init_state = mip6_rthdr_init_state,
476 .destructor = mip6_rthdr_destroy,
477 .input = mip6_rthdr_input,
478 .output = mip6_rthdr_output,
479 .hdr_offset = mip6_rthdr_offset,
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700480};
481
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700482static int __init mip6_init(void)
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700483{
Joe Perchesf3213832012-05-15 14:11:53 +0000484 pr_info("Mobile IPv6\n");
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700485
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700486 if (xfrm_register_type(&mip6_destopt_type, AF_INET6) < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +0000487 pr_info("%s: can't add xfrm type(destopt)\n", __func__);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700488 goto mip6_destopt_xfrm_fail;
489 }
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700490 if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +0000491 pr_info("%s: can't add xfrm type(rthdr)\n", __func__);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700492 goto mip6_rthdr_xfrm_fail;
493 }
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700494 if (rawv6_mh_filter_register(mip6_mh_filter) < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +0000495 pr_info("%s: can't add rawv6 mh filter\n", __func__);
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700496 goto mip6_rawv6_mh_fail;
497 }
498
499
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700500 return 0;
501
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700502 mip6_rawv6_mh_fail:
503 xfrm_unregister_type(&mip6_rthdr_type, AF_INET6);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700504 mip6_rthdr_xfrm_fail:
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700505 xfrm_unregister_type(&mip6_destopt_type, AF_INET6);
506 mip6_destopt_xfrm_fail:
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700507 return -EAGAIN;
508}
509
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700510static void __exit mip6_fini(void)
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700511{
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700512 if (rawv6_mh_filter_unregister(mip6_mh_filter) < 0)
Joe Perchesf3213832012-05-15 14:11:53 +0000513 pr_info("%s: can't remove rawv6 mh filter\n", __func__);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700514 if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0)
Joe Perchesf3213832012-05-15 14:11:53 +0000515 pr_info("%s: can't remove xfrm type(rthdr)\n", __func__);
Noriaki TAKAMIYA3d126892006-08-23 20:32:34 -0700516 if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0)
Joe Perchesf3213832012-05-15 14:11:53 +0000517 pr_info("%s: can't remove xfrm type(destopt)\n", __func__);
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700518}
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700519
520module_init(mip6_init);
521module_exit(mip6_fini);
522
523MODULE_LICENSE("GPL");
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -0700524MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_DSTOPTS);
525MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ROUTING);