Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 1 | /* |
| 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 TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 25 | #include <linux/module.h> |
| 26 | #include <linux/skbuff.h> |
Masahide NAKAMURA | 70182ed | 2006-08-23 20:45:55 -0700 | [diff] [blame] | 27 | #include <linux/time.h> |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 28 | #include <linux/ipv6.h> |
Masahide NAKAMURA | 7be96f7 | 2006-08-23 20:35:31 -0700 | [diff] [blame] | 29 | #include <linux/icmpv6.h> |
| 30 | #include <net/sock.h> |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 31 | #include <net/ipv6.h> |
Masahide NAKAMURA | 7be96f7 | 2006-08-23 20:35:31 -0700 | [diff] [blame] | 32 | #include <net/ip6_checksum.h> |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 33 | #include <net/xfrm.h> |
| 34 | #include <net/mip6.h> |
| 35 | |
| 36 | static xfrm_address_t *mip6_xfrm_addr(struct xfrm_state *x, xfrm_address_t *addr) |
| 37 | { |
| 38 | return x->coaddr; |
| 39 | } |
| 40 | |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 41 | static inline unsigned int calc_padlen(unsigned int len, unsigned int n) |
| 42 | { |
| 43 | return (n - len + 16) & 0x7; |
| 44 | } |
| 45 | |
| 46 | static inline void *mip6_padn(__u8 *data, __u8 padlen) |
| 47 | { |
| 48 | if (!data) |
| 49 | return NULL; |
| 50 | if (padlen == 1) { |
| 51 | data[0] = MIP6_OPT_PAD_1; |
| 52 | } else if (padlen > 1) { |
| 53 | data[0] = MIP6_OPT_PAD_N; |
| 54 | data[1] = padlen - 2; |
| 55 | if (padlen > 2) |
| 56 | memset(data+2, 0, data[1]); |
| 57 | } |
| 58 | return data + padlen; |
| 59 | } |
| 60 | |
Masahide NAKAMURA | 7be96f7 | 2006-08-23 20:35:31 -0700 | [diff] [blame] | 61 | static inline void mip6_param_prob(struct sk_buff *skb, int code, int pos) |
| 62 | { |
| 63 | icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev); |
| 64 | } |
| 65 | |
| 66 | static int mip6_mh_len(int type) |
| 67 | { |
| 68 | int len = 0; |
| 69 | |
| 70 | switch (type) { |
| 71 | case IP6_MH_TYPE_BRR: |
| 72 | len = 0; |
| 73 | break; |
| 74 | case IP6_MH_TYPE_HOTI: |
| 75 | case IP6_MH_TYPE_COTI: |
| 76 | case IP6_MH_TYPE_BU: |
| 77 | case IP6_MH_TYPE_BACK: |
| 78 | len = 1; |
| 79 | break; |
| 80 | case IP6_MH_TYPE_HOT: |
| 81 | case IP6_MH_TYPE_COT: |
| 82 | case IP6_MH_TYPE_BERROR: |
| 83 | len = 2; |
| 84 | break; |
| 85 | } |
| 86 | return len; |
| 87 | } |
| 88 | |
| 89 | int mip6_mh_filter(struct sock *sk, struct sk_buff *skb) |
| 90 | { |
| 91 | struct ip6_mh *mh; |
Masahide NAKAMURA | 7be96f7 | 2006-08-23 20:35:31 -0700 | [diff] [blame] | 92 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 93 | if (!pskb_may_pull(skb, (skb_transport_offset(skb)) + 8) || |
| 94 | !pskb_may_pull(skb, (skb_transport_offset(skb) + |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 95 | ((skb_transport_header(skb)[1] + 1) << 3)))) |
Masahide NAKAMURA | 7be96f7 | 2006-08-23 20:35:31 -0700 | [diff] [blame] | 96 | return -1; |
| 97 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 98 | mh = (struct ip6_mh *)skb_transport_header(skb); |
Masahide NAKAMURA | 7be96f7 | 2006-08-23 20:35:31 -0700 | [diff] [blame] | 99 | |
| 100 | if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) { |
| 101 | LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH message too short: %d vs >=%d\n", |
| 102 | mh->ip6mh_hdrlen, mip6_mh_len(mh->ip6mh_type)); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 103 | mip6_param_prob(skb, 0, ((&mh->ip6mh_hdrlen) - |
| 104 | skb_network_header(skb))); |
Masahide NAKAMURA | 7be96f7 | 2006-08-23 20:35:31 -0700 | [diff] [blame] | 105 | return -1; |
| 106 | } |
Masahide NAKAMURA | 7be96f7 | 2006-08-23 20:35:31 -0700 | [diff] [blame] | 107 | |
| 108 | if (mh->ip6mh_proto != IPPROTO_NONE) { |
| 109 | LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH invalid payload proto = %d\n", |
| 110 | mh->ip6mh_proto); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 111 | mip6_param_prob(skb, 0, ((&mh->ip6mh_proto) - |
| 112 | skb_network_header(skb))); |
Masahide NAKAMURA | 7be96f7 | 2006-08-23 20:35:31 -0700 | [diff] [blame] | 113 | return -1; |
| 114 | } |
| 115 | |
| 116 | return 0; |
| 117 | } |
| 118 | |
Masahide NAKAMURA | 70182ed | 2006-08-23 20:45:55 -0700 | [diff] [blame] | 119 | struct mip6_report_rate_limiter { |
| 120 | spinlock_t lock; |
| 121 | struct timeval stamp; |
| 122 | int iif; |
| 123 | struct in6_addr src; |
| 124 | struct in6_addr dst; |
| 125 | }; |
| 126 | |
| 127 | static struct mip6_report_rate_limiter mip6_report_rl = { |
| 128 | .lock = SPIN_LOCK_UNLOCKED |
| 129 | }; |
| 130 | |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 131 | static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb) |
| 132 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 133 | struct ipv6hdr *iph = ipv6_hdr(skb); |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 134 | struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data; |
| 135 | |
| 136 | if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) && |
| 137 | !ipv6_addr_any((struct in6_addr *)x->coaddr)) |
| 138 | return -ENOENT; |
| 139 | |
| 140 | return destopt->nexthdr; |
| 141 | } |
| 142 | |
| 143 | /* Destination Option Header is inserted. |
| 144 | * IP Header's src address is replaced with Home Address Option in |
| 145 | * Destination Option Header. |
| 146 | */ |
| 147 | static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb) |
| 148 | { |
| 149 | struct ipv6hdr *iph; |
| 150 | struct ipv6_destopt_hdr *dstopt; |
| 151 | struct ipv6_destopt_hao *hao; |
| 152 | u8 nexthdr; |
| 153 | int len; |
| 154 | |
| 155 | iph = (struct ipv6hdr *)skb->data; |
| 156 | iph->payload_len = htons(skb->len - sizeof(*iph)); |
| 157 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 158 | nexthdr = *skb_network_header(skb); |
| 159 | *skb_network_header(skb) = IPPROTO_DSTOPTS; |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 160 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 161 | dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb); |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 162 | dstopt->nexthdr = nexthdr; |
| 163 | |
| 164 | hao = mip6_padn((char *)(dstopt + 1), |
| 165 | calc_padlen(sizeof(*dstopt), 6)); |
| 166 | |
| 167 | hao->type = IPV6_TLV_HAO; |
| 168 | hao->length = sizeof(*hao) - 2; |
| 169 | BUG_TRAP(hao->length == 16); |
| 170 | |
| 171 | len = ((char *)hao - (char *)dstopt) + sizeof(*hao); |
| 172 | |
| 173 | memcpy(&hao->addr, &iph->saddr, sizeof(hao->addr)); |
| 174 | memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr)); |
| 175 | |
| 176 | BUG_TRAP(len == x->props.header_len); |
| 177 | dstopt->hdrlen = (x->props.header_len >> 3) - 1; |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
Masahide NAKAMURA | 70182ed | 2006-08-23 20:45:55 -0700 | [diff] [blame] | 182 | static inline int mip6_report_rl_allow(struct timeval *stamp, |
| 183 | struct in6_addr *dst, |
| 184 | struct in6_addr *src, int iif) |
| 185 | { |
| 186 | int allow = 0; |
| 187 | |
| 188 | spin_lock_bh(&mip6_report_rl.lock); |
| 189 | if (mip6_report_rl.stamp.tv_sec != stamp->tv_sec || |
| 190 | mip6_report_rl.stamp.tv_usec != stamp->tv_usec || |
| 191 | mip6_report_rl.iif != iif || |
| 192 | !ipv6_addr_equal(&mip6_report_rl.src, src) || |
| 193 | !ipv6_addr_equal(&mip6_report_rl.dst, dst)) { |
| 194 | mip6_report_rl.stamp.tv_sec = stamp->tv_sec; |
| 195 | mip6_report_rl.stamp.tv_usec = stamp->tv_usec; |
| 196 | mip6_report_rl.iif = iif; |
| 197 | ipv6_addr_copy(&mip6_report_rl.src, src); |
| 198 | ipv6_addr_copy(&mip6_report_rl.dst, dst); |
| 199 | allow = 1; |
| 200 | } |
| 201 | spin_unlock_bh(&mip6_report_rl.lock); |
| 202 | return allow; |
| 203 | } |
| 204 | |
| 205 | static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb, struct flowi *fl) |
| 206 | { |
| 207 | struct inet6_skb_parm *opt = (struct inet6_skb_parm *)skb->cb; |
| 208 | struct ipv6_destopt_hao *hao = NULL; |
| 209 | struct xfrm_selector sel; |
| 210 | int offset; |
| 211 | struct timeval stamp; |
| 212 | int err = 0; |
| 213 | |
YOSHIFUJI Hideaki | e731c24 | 2006-08-24 23:18:12 +0900 | [diff] [blame] | 214 | if (unlikely(fl->proto == IPPROTO_MH && |
| 215 | fl->fl_mh_type <= IP6_MH_TYPE_MAX)) |
Masahide NAKAMURA | 01be8e5 | 2006-08-23 20:47:44 -0700 | [diff] [blame] | 216 | goto out; |
| 217 | |
Masahide NAKAMURA | 70182ed | 2006-08-23 20:45:55 -0700 | [diff] [blame] | 218 | if (likely(opt->dsthao)) { |
| 219 | offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); |
| 220 | if (likely(offset >= 0)) |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 221 | hao = (struct ipv6_destopt_hao *) |
| 222 | (skb_network_header(skb) + offset); |
Masahide NAKAMURA | 70182ed | 2006-08-23 20:45:55 -0700 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | skb_get_timestamp(skb, &stamp); |
| 226 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 227 | if (!mip6_report_rl_allow(&stamp, &ipv6_hdr(skb)->daddr, |
| 228 | hao ? &hao->addr : &ipv6_hdr(skb)->saddr, |
Masahide NAKAMURA | 70182ed | 2006-08-23 20:45:55 -0700 | [diff] [blame] | 229 | opt->iif)) |
| 230 | goto out; |
| 231 | |
| 232 | memset(&sel, 0, sizeof(sel)); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 233 | memcpy(&sel.daddr, (xfrm_address_t *)&ipv6_hdr(skb)->daddr, |
Masahide NAKAMURA | 70182ed | 2006-08-23 20:45:55 -0700 | [diff] [blame] | 234 | sizeof(sel.daddr)); |
| 235 | sel.prefixlen_d = 128; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 236 | memcpy(&sel.saddr, (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
Masahide NAKAMURA | 70182ed | 2006-08-23 20:45:55 -0700 | [diff] [blame] | 237 | sizeof(sel.saddr)); |
| 238 | sel.prefixlen_s = 128; |
| 239 | sel.family = AF_INET6; |
| 240 | sel.proto = fl->proto; |
| 241 | sel.dport = xfrm_flowi_dport(fl); |
| 242 | if (sel.dport) |
Al Viro | e69a4ad | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 243 | sel.dport_mask = htons(~0); |
Masahide NAKAMURA | 70182ed | 2006-08-23 20:45:55 -0700 | [diff] [blame] | 244 | sel.sport = xfrm_flowi_sport(fl); |
| 245 | if (sel.sport) |
Al Viro | e69a4ad | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 246 | sel.sport_mask = htons(~0); |
Masahide NAKAMURA | 70182ed | 2006-08-23 20:45:55 -0700 | [diff] [blame] | 247 | sel.ifindex = fl->oif; |
| 248 | |
| 249 | err = km_report(IPPROTO_DSTOPTS, &sel, |
| 250 | (hao ? (xfrm_address_t *)&hao->addr : NULL)); |
| 251 | |
| 252 | out: |
| 253 | return err; |
| 254 | } |
| 255 | |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 256 | static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb, |
| 257 | u8 **nexthdr) |
| 258 | { |
| 259 | u16 offset = sizeof(struct ipv6hdr); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 260 | struct ipv6_opt_hdr *exthdr = |
| 261 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 262 | const unsigned char *nh = skb_network_header(skb); |
| 263 | unsigned int packet_len = skb->tail - nh; |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 264 | int found_rhdr = 0; |
| 265 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 266 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 267 | |
| 268 | while (offset + 1 <= packet_len) { |
| 269 | |
| 270 | switch (**nexthdr) { |
| 271 | case NEXTHDR_HOP: |
| 272 | break; |
| 273 | case NEXTHDR_ROUTING: |
| 274 | found_rhdr = 1; |
| 275 | break; |
| 276 | case NEXTHDR_DEST: |
| 277 | /* |
| 278 | * HAO MUST NOT appear more than once. |
| 279 | * XXX: It is better to try to find by the end of |
| 280 | * XXX: packet if HAO exists. |
| 281 | */ |
| 282 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) { |
| 283 | LIMIT_NETDEBUG(KERN_WARNING "mip6: hao exists already, override\n"); |
| 284 | return offset; |
| 285 | } |
| 286 | |
| 287 | if (found_rhdr) |
| 288 | return offset; |
| 289 | |
| 290 | break; |
| 291 | default: |
| 292 | return offset; |
| 293 | } |
| 294 | |
| 295 | offset += ipv6_optlen(exthdr); |
| 296 | *nexthdr = &exthdr->nexthdr; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 297 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | return offset; |
| 301 | } |
| 302 | |
| 303 | static int mip6_destopt_init_state(struct xfrm_state *x) |
| 304 | { |
| 305 | if (x->id.spi) { |
| 306 | printk(KERN_INFO "%s: spi is not 0: %u\n", __FUNCTION__, |
| 307 | x->id.spi); |
| 308 | return -EINVAL; |
| 309 | } |
| 310 | if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) { |
| 311 | printk(KERN_INFO "%s: state's mode is not %u: %u\n", |
| 312 | __FUNCTION__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode); |
| 313 | return -EINVAL; |
| 314 | } |
| 315 | |
| 316 | x->props.header_len = sizeof(struct ipv6_destopt_hdr) + |
| 317 | calc_padlen(sizeof(struct ipv6_destopt_hdr), 6) + |
| 318 | sizeof(struct ipv6_destopt_hao); |
| 319 | BUG_TRAP(x->props.header_len == 24); |
| 320 | |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * Do nothing about destroying since it has no specific operation for |
| 326 | * destination options header unlike IPsec protocols. |
| 327 | */ |
| 328 | static void mip6_destopt_destroy(struct xfrm_state *x) |
| 329 | { |
| 330 | } |
| 331 | |
| 332 | static struct xfrm_type mip6_destopt_type = |
| 333 | { |
| 334 | .description = "MIP6DESTOPT", |
| 335 | .owner = THIS_MODULE, |
| 336 | .proto = IPPROTO_DSTOPTS, |
| 337 | .flags = XFRM_TYPE_NON_FRAGMENT, |
| 338 | .init_state = mip6_destopt_init_state, |
| 339 | .destructor = mip6_destopt_destroy, |
| 340 | .input = mip6_destopt_input, |
| 341 | .output = mip6_destopt_output, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 342 | .reject = mip6_destopt_reject, |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 343 | .hdr_offset = mip6_destopt_offset, |
| 344 | .local_addr = mip6_xfrm_addr, |
| 345 | }; |
| 346 | |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 347 | static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb) |
| 348 | { |
| 349 | struct rt2_hdr *rt2 = (struct rt2_hdr *)skb->data; |
| 350 | |
| 351 | if (!ipv6_addr_equal(&rt2->addr, (struct in6_addr *)x->coaddr) && |
| 352 | !ipv6_addr_any((struct in6_addr *)x->coaddr)) |
| 353 | return -ENOENT; |
| 354 | |
| 355 | return rt2->rt_hdr.nexthdr; |
| 356 | } |
| 357 | |
| 358 | /* Routing Header type 2 is inserted. |
| 359 | * IP Header's dst address is replaced with Routing Header's Home Address. |
| 360 | */ |
| 361 | static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb) |
| 362 | { |
| 363 | struct ipv6hdr *iph; |
| 364 | struct rt2_hdr *rt2; |
| 365 | u8 nexthdr; |
| 366 | |
| 367 | iph = (struct ipv6hdr *)skb->data; |
| 368 | iph->payload_len = htons(skb->len - sizeof(*iph)); |
| 369 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 370 | nexthdr = *skb_network_header(skb); |
| 371 | *skb_network_header(skb) = IPPROTO_ROUTING; |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 372 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 373 | rt2 = (struct rt2_hdr *)skb_transport_header(skb); |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 374 | rt2->rt_hdr.nexthdr = nexthdr; |
| 375 | rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1; |
| 376 | rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2; |
| 377 | rt2->rt_hdr.segments_left = 1; |
| 378 | memset(&rt2->reserved, 0, sizeof(rt2->reserved)); |
| 379 | |
| 380 | BUG_TRAP(rt2->rt_hdr.hdrlen == 2); |
| 381 | |
| 382 | memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr)); |
| 383 | memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr)); |
| 384 | |
| 385 | return 0; |
| 386 | } |
| 387 | |
| 388 | static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb, |
| 389 | u8 **nexthdr) |
| 390 | { |
| 391 | u16 offset = sizeof(struct ipv6hdr); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 392 | struct ipv6_opt_hdr *exthdr = |
| 393 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 394 | const unsigned char *nh = skb_network_header(skb); |
| 395 | unsigned int packet_len = skb->tail - nh; |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 396 | int found_rhdr = 0; |
| 397 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 398 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 399 | |
| 400 | while (offset + 1 <= packet_len) { |
| 401 | |
| 402 | switch (**nexthdr) { |
| 403 | case NEXTHDR_HOP: |
| 404 | break; |
| 405 | case NEXTHDR_ROUTING: |
| 406 | if (offset + 3 <= packet_len) { |
| 407 | struct ipv6_rt_hdr *rt; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 408 | rt = (struct ipv6_rt_hdr *)(nh + offset); |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 409 | if (rt->type != 0) |
| 410 | return offset; |
| 411 | } |
| 412 | found_rhdr = 1; |
| 413 | break; |
| 414 | case NEXTHDR_DEST: |
| 415 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
| 416 | return offset; |
| 417 | |
| 418 | if (found_rhdr) |
| 419 | return offset; |
| 420 | |
| 421 | break; |
| 422 | default: |
| 423 | return offset; |
| 424 | } |
| 425 | |
| 426 | offset += ipv6_optlen(exthdr); |
| 427 | *nexthdr = &exthdr->nexthdr; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 428 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 429 | } |
| 430 | |
| 431 | return offset; |
| 432 | } |
| 433 | |
| 434 | static int mip6_rthdr_init_state(struct xfrm_state *x) |
| 435 | { |
| 436 | if (x->id.spi) { |
| 437 | printk(KERN_INFO "%s: spi is not 0: %u\n", __FUNCTION__, |
| 438 | x->id.spi); |
| 439 | return -EINVAL; |
| 440 | } |
| 441 | if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) { |
| 442 | printk(KERN_INFO "%s: state's mode is not %u: %u\n", |
| 443 | __FUNCTION__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode); |
| 444 | return -EINVAL; |
| 445 | } |
| 446 | |
| 447 | x->props.header_len = sizeof(struct rt2_hdr); |
| 448 | |
| 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | /* |
| 453 | * Do nothing about destroying since it has no specific operation for routing |
| 454 | * header type 2 unlike IPsec protocols. |
| 455 | */ |
| 456 | static void mip6_rthdr_destroy(struct xfrm_state *x) |
| 457 | { |
| 458 | } |
| 459 | |
| 460 | static struct xfrm_type mip6_rthdr_type = |
| 461 | { |
| 462 | .description = "MIP6RT", |
| 463 | .owner = THIS_MODULE, |
| 464 | .proto = IPPROTO_ROUTING, |
| 465 | .flags = XFRM_TYPE_NON_FRAGMENT, |
| 466 | .init_state = mip6_rthdr_init_state, |
| 467 | .destructor = mip6_rthdr_destroy, |
| 468 | .input = mip6_rthdr_input, |
| 469 | .output = mip6_rthdr_output, |
| 470 | .hdr_offset = mip6_rthdr_offset, |
| 471 | .remote_addr = mip6_xfrm_addr, |
| 472 | }; |
| 473 | |
| 474 | int __init mip6_init(void) |
| 475 | { |
| 476 | printk(KERN_INFO "Mobile IPv6\n"); |
| 477 | |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 478 | if (xfrm_register_type(&mip6_destopt_type, AF_INET6) < 0) { |
| 479 | printk(KERN_INFO "%s: can't add xfrm type(destopt)\n", __FUNCTION__); |
| 480 | goto mip6_destopt_xfrm_fail; |
| 481 | } |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 482 | if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) { |
| 483 | printk(KERN_INFO "%s: can't add xfrm type(rthdr)\n", __FUNCTION__); |
| 484 | goto mip6_rthdr_xfrm_fail; |
| 485 | } |
| 486 | return 0; |
| 487 | |
| 488 | mip6_rthdr_xfrm_fail: |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 489 | xfrm_unregister_type(&mip6_destopt_type, AF_INET6); |
| 490 | mip6_destopt_xfrm_fail: |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 491 | return -EAGAIN; |
| 492 | } |
| 493 | |
| 494 | void __exit mip6_fini(void) |
| 495 | { |
| 496 | if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0) |
| 497 | printk(KERN_INFO "%s: can't remove xfrm type(rthdr)\n", __FUNCTION__); |
Noriaki TAKAMIYA | 3d12689 | 2006-08-23 20:32:34 -0700 | [diff] [blame] | 498 | if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0) |
| 499 | printk(KERN_INFO "%s: can't remove xfrm type(destopt)\n", __FUNCTION__); |
Noriaki TAKAMIYA | 2c8d7ca | 2006-08-23 20:31:11 -0700 | [diff] [blame] | 500 | } |