1 /* 2 * CIPSO - Commercial IP Security Option 3 * 4 * This is an implementation of the CIPSO 2.2 protocol as specified in 5 * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in 6 * FIPS-188, copies of both documents can be found in the Documentation 7 * directory. While CIPSO never became a full IETF RFC standard many vendors 8 * have chosen to adopt the protocol and over the years it has become a 9 * de-facto standard for labeled networking. 10 * 11 * Author: Paul Moore <paul@paul-moore.com> 12 * 13 */ 14 15 /* 16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 17 * 18 * This program is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License as published by 20 * the Free Software Foundation; either version 2 of the License, or 21 * (at your option) any later version. 22 * 23 * This program is distributed in the hope that it will be useful, 24 * but WITHOUT ANY WARRANTY; without even the implied warranty of 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 26 * the GNU General Public License for more details. 27 * 28 * You should have received a copy of the GNU General Public License 29 * along with this program; if not, see <http://www.gnu.org/licenses/>. 30 * 31 */ 32 33 #ifndef _CIPSO_IPV4_H 34 #define _CIPSO_IPV4_H 35 36 #include <linux/types.h> 37 #include <linux/rcupdate.h> 38 #include <linux/list.h> 39 #include <linux/net.h> 40 #include <linux/skbuff.h> 41 #include <net/netlabel.h> 42 #include <net/request_sock.h> 43 #include <linux/atomic.h> 44 #include <asm/unaligned.h> 45 46 /* known doi values */ 47 #define CIPSO_V4_DOI_UNKNOWN 0x00000000 48 49 /* standard tag types */ 50 #define CIPSO_V4_TAG_INVALID 0 51 #define CIPSO_V4_TAG_RBITMAP 1 52 #define CIPSO_V4_TAG_ENUM 2 53 #define CIPSO_V4_TAG_RANGE 5 54 #define CIPSO_V4_TAG_PBITMAP 6 55 #define CIPSO_V4_TAG_FREEFORM 7 56 57 /* non-standard tag types (tags > 127) */ 58 #define CIPSO_V4_TAG_LOCAL 128 59 60 /* doi mapping types */ 61 #define CIPSO_V4_MAP_UNKNOWN 0 62 #define CIPSO_V4_MAP_TRANS 1 63 #define CIPSO_V4_MAP_PASS 2 64 #define CIPSO_V4_MAP_LOCAL 3 65 66 /* limits */ 67 #define CIPSO_V4_MAX_REM_LVLS 255 68 #define CIPSO_V4_INV_LVL 0x80000000 69 #define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1) 70 #define CIPSO_V4_MAX_REM_CATS 65534 71 #define CIPSO_V4_INV_CAT 0x80000000 72 #define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1) 73 74 /* 75 * CIPSO DOI definitions 76 */ 77 78 /* DOI definition struct */ 79 #define CIPSO_V4_TAG_MAXCNT 5 80 struct cipso_v4_doi { 81 u32 doi; 82 u32 type; 83 union { 84 struct cipso_v4_std_map_tbl *std; 85 } map; 86 u8 tags[CIPSO_V4_TAG_MAXCNT]; 87 88 atomic_t refcount; 89 struct list_head list; 90 struct rcu_head rcu; 91 }; 92 93 /* Standard CIPSO mapping table */ 94 /* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the 95 * bit is set then consider that value as unspecified, meaning the 96 * mapping for that particular level/category is invalid */ 97 struct cipso_v4_std_map_tbl { 98 struct { 99 u32 *cipso; 100 u32 *local; 101 u32 cipso_size; 102 u32 local_size; 103 } lvl; 104 struct { 105 u32 *cipso; 106 u32 *local; 107 u32 cipso_size; 108 u32 local_size; 109 } cat; 110 }; 111 112 /* 113 * Sysctl Variables 114 */ 115 116 #ifdef CONFIG_NETLABEL 117 extern int cipso_v4_cache_enabled; 118 extern int cipso_v4_cache_bucketsize; 119 extern int cipso_v4_rbm_optfmt; 120 extern int cipso_v4_rbm_strictvalid; 121 #endif 122 123 /* 124 * DOI List Functions 125 */ 126 127 #ifdef CONFIG_NETLABEL 128 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, 129 struct netlbl_audit *audit_info); 130 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def); 131 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info); 132 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi); 133 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def); 134 int cipso_v4_doi_walk(u32 *skip_cnt, 135 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 136 void *cb_arg); 137 #else 138 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, 139 struct netlbl_audit *audit_info) 140 { 141 return -ENOSYS; 142 } 143 144 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) 145 { 146 return; 147 } 148 149 static inline int cipso_v4_doi_remove(u32 doi, 150 struct netlbl_audit *audit_info) 151 { 152 return 0; 153 } 154 155 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) 156 { 157 return NULL; 158 } 159 160 static inline int cipso_v4_doi_walk(u32 *skip_cnt, 161 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 162 void *cb_arg) 163 { 164 return 0; 165 } 166 167 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, 168 const char *domain) 169 { 170 return -ENOSYS; 171 } 172 173 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, 174 const char *domain) 175 { 176 return 0; 177 } 178 #endif /* CONFIG_NETLABEL */ 179 180 /* 181 * Label Mapping Cache Functions 182 */ 183 184 #ifdef CONFIG_NETLABEL 185 void cipso_v4_cache_invalidate(void); 186 int cipso_v4_cache_add(const unsigned char *cipso_ptr, 187 const struct netlbl_lsm_secattr *secattr); 188 #else 189 static inline void cipso_v4_cache_invalidate(void) 190 { 191 return; 192 } 193 194 static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr, 195 const struct netlbl_lsm_secattr *secattr) 196 { 197 return 0; 198 } 199 #endif /* CONFIG_NETLABEL */ 200 201 /* 202 * Protocol Handling Functions 203 */ 204 205 #ifdef CONFIG_NETLABEL 206 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway); 207 int cipso_v4_getattr(const unsigned char *cipso, 208 struct netlbl_lsm_secattr *secattr); 209 int cipso_v4_sock_setattr(struct sock *sk, 210 const struct cipso_v4_doi *doi_def, 211 const struct netlbl_lsm_secattr *secattr); 212 void cipso_v4_sock_delattr(struct sock *sk); 213 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); 214 int cipso_v4_req_setattr(struct request_sock *req, 215 const struct cipso_v4_doi *doi_def, 216 const struct netlbl_lsm_secattr *secattr); 217 void cipso_v4_req_delattr(struct request_sock *req); 218 int cipso_v4_skbuff_setattr(struct sk_buff *skb, 219 const struct cipso_v4_doi *doi_def, 220 const struct netlbl_lsm_secattr *secattr); 221 int cipso_v4_skbuff_delattr(struct sk_buff *skb); 222 int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 223 struct netlbl_lsm_secattr *secattr); 224 unsigned char *cipso_v4_optptr(const struct sk_buff *skb); 225 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option); 226 #else 227 static inline void cipso_v4_error(struct sk_buff *skb, 228 int error, 229 u32 gateway) 230 { 231 return; 232 } 233 234 static inline int cipso_v4_getattr(const unsigned char *cipso, 235 struct netlbl_lsm_secattr *secattr) 236 { 237 return -ENOSYS; 238 } 239 240 static inline int cipso_v4_sock_setattr(struct sock *sk, 241 const struct cipso_v4_doi *doi_def, 242 const struct netlbl_lsm_secattr *secattr) 243 { 244 return -ENOSYS; 245 } 246 247 static inline void cipso_v4_sock_delattr(struct sock *sk) 248 { 249 } 250 251 static inline int cipso_v4_sock_getattr(struct sock *sk, 252 struct netlbl_lsm_secattr *secattr) 253 { 254 return -ENOSYS; 255 } 256 257 static inline int cipso_v4_req_setattr(struct request_sock *req, 258 const struct cipso_v4_doi *doi_def, 259 const struct netlbl_lsm_secattr *secattr) 260 { 261 return -ENOSYS; 262 } 263 264 static inline void cipso_v4_req_delattr(struct request_sock *req) 265 { 266 return; 267 } 268 269 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb, 270 const struct cipso_v4_doi *doi_def, 271 const struct netlbl_lsm_secattr *secattr) 272 { 273 return -ENOSYS; 274 } 275 276 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb) 277 { 278 return -ENOSYS; 279 } 280 281 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 282 struct netlbl_lsm_secattr *secattr) 283 { 284 return -ENOSYS; 285 } 286 287 static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb) 288 { 289 return NULL; 290 } 291 292 static inline int cipso_v4_validate(const struct sk_buff *skb, 293 unsigned char **option) 294 { 295 unsigned char *opt = *option; 296 unsigned char err_offset = 0; 297 u8 opt_len = opt[1]; 298 u8 opt_iter; 299 u8 tag_len; 300 301 if (opt_len < 8) { 302 err_offset = 1; 303 goto out; 304 } 305 306 if (get_unaligned_be32(&opt[2]) == 0) { 307 err_offset = 2; 308 goto out; 309 } 310 311 for (opt_iter = 6; opt_iter < opt_len;) { 312 if (opt_iter + 1 == opt_len) { 313 err_offset = opt_iter; 314 goto out; 315 } 316 tag_len = opt[opt_iter + 1]; 317 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) { 318 err_offset = opt_iter + 1; 319 goto out; 320 } 321 opt_iter += tag_len; 322 } 323 324 out: 325 *option = opt + err_offset; 326 return err_offset; 327 328 } 329 #endif /* CONFIG_NETLABEL */ 330 331 #endif /* _CIPSO_IPV4_H */ 332