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, write to the Free Software 30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 31 * 32 */ 33 34 #ifndef _CIPSO_IPV4_H 35 #define _CIPSO_IPV4_H 36 37 #include <linux/types.h> 38 #include <linux/rcupdate.h> 39 #include <linux/list.h> 40 #include <linux/net.h> 41 #include <linux/skbuff.h> 42 #include <net/netlabel.h> 43 #include <net/request_sock.h> 44 #include <linux/atomic.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 * Helper Functions 125 */ 126 127 #define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0) 128 #define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso) 129 130 /* 131 * DOI List Functions 132 */ 133 134 #ifdef CONFIG_NETLABEL 135 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, 136 struct netlbl_audit *audit_info); 137 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def); 138 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info); 139 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi); 140 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def); 141 int cipso_v4_doi_walk(u32 *skip_cnt, 142 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 143 void *cb_arg); 144 #else 145 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, 146 struct netlbl_audit *audit_info) 147 { 148 return -ENOSYS; 149 } 150 151 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) 152 { 153 return; 154 } 155 156 static inline int cipso_v4_doi_remove(u32 doi, 157 struct netlbl_audit *audit_info) 158 { 159 return 0; 160 } 161 162 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) 163 { 164 return NULL; 165 } 166 167 static inline int cipso_v4_doi_walk(u32 *skip_cnt, 168 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 169 void *cb_arg) 170 { 171 return 0; 172 } 173 174 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, 175 const char *domain) 176 { 177 return -ENOSYS; 178 } 179 180 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, 181 const char *domain) 182 { 183 return 0; 184 } 185 #endif /* CONFIG_NETLABEL */ 186 187 /* 188 * Label Mapping Cache Functions 189 */ 190 191 #ifdef CONFIG_NETLABEL 192 void cipso_v4_cache_invalidate(void); 193 int cipso_v4_cache_add(const struct sk_buff *skb, 194 const struct netlbl_lsm_secattr *secattr); 195 #else 196 static inline void cipso_v4_cache_invalidate(void) 197 { 198 return; 199 } 200 201 static inline int cipso_v4_cache_add(const struct sk_buff *skb, 202 const struct netlbl_lsm_secattr *secattr) 203 { 204 return 0; 205 } 206 #endif /* CONFIG_NETLABEL */ 207 208 /* 209 * Protocol Handling Functions 210 */ 211 212 #ifdef CONFIG_NETLABEL 213 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway); 214 int cipso_v4_sock_setattr(struct sock *sk, 215 const struct cipso_v4_doi *doi_def, 216 const struct netlbl_lsm_secattr *secattr); 217 void cipso_v4_sock_delattr(struct sock *sk); 218 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); 219 int cipso_v4_req_setattr(struct request_sock *req, 220 const struct cipso_v4_doi *doi_def, 221 const struct netlbl_lsm_secattr *secattr); 222 void cipso_v4_req_delattr(struct request_sock *req); 223 int cipso_v4_skbuff_setattr(struct sk_buff *skb, 224 const struct cipso_v4_doi *doi_def, 225 const struct netlbl_lsm_secattr *secattr); 226 int cipso_v4_skbuff_delattr(struct sk_buff *skb); 227 int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 228 struct netlbl_lsm_secattr *secattr); 229 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option); 230 #else 231 static inline void cipso_v4_error(struct sk_buff *skb, 232 int error, 233 u32 gateway) 234 { 235 return; 236 } 237 238 static inline int cipso_v4_sock_setattr(struct sock *sk, 239 const struct cipso_v4_doi *doi_def, 240 const struct netlbl_lsm_secattr *secattr) 241 { 242 return -ENOSYS; 243 } 244 245 static inline void cipso_v4_sock_delattr(struct sock *sk) 246 { 247 } 248 249 static inline int cipso_v4_sock_getattr(struct sock *sk, 250 struct netlbl_lsm_secattr *secattr) 251 { 252 return -ENOSYS; 253 } 254 255 static inline int cipso_v4_req_setattr(struct request_sock *req, 256 const struct cipso_v4_doi *doi_def, 257 const struct netlbl_lsm_secattr *secattr) 258 { 259 return -ENOSYS; 260 } 261 262 static inline void cipso_v4_req_delattr(struct request_sock *req) 263 { 264 return; 265 } 266 267 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb, 268 const struct cipso_v4_doi *doi_def, 269 const struct netlbl_lsm_secattr *secattr) 270 { 271 return -ENOSYS; 272 } 273 274 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb) 275 { 276 return -ENOSYS; 277 } 278 279 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 280 struct netlbl_lsm_secattr *secattr) 281 { 282 return -ENOSYS; 283 } 284 285 static inline int cipso_v4_validate(const struct sk_buff *skb, 286 unsigned char **option) 287 { 288 return -ENOSYS; 289 } 290 #endif /* CONFIG_NETLABEL */ 291 292 #endif /* _CIPSO_IPV4_H */ 293