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.moore@hp.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 <asm/atomic.h> 44 45 /* known doi values */ 46 #define CIPSO_V4_DOI_UNKNOWN 0x00000000 47 48 /* standard tag types */ 49 #define CIPSO_V4_TAG_INVALID 0 50 #define CIPSO_V4_TAG_RBITMAP 1 51 #define CIPSO_V4_TAG_ENUM 2 52 #define CIPSO_V4_TAG_RANGE 5 53 #define CIPSO_V4_TAG_PBITMAP 6 54 #define CIPSO_V4_TAG_FREEFORM 7 55 56 /* non-standard tag types (tags > 127) */ 57 #define CIPSO_V4_TAG_LOCAL 128 58 59 /* doi mapping types */ 60 #define CIPSO_V4_MAP_UNKNOWN 0 61 #define CIPSO_V4_MAP_TRANS 1 62 #define CIPSO_V4_MAP_PASS 2 63 #define CIPSO_V4_MAP_LOCAL 3 64 65 /* limits */ 66 #define CIPSO_V4_MAX_REM_LVLS 255 67 #define CIPSO_V4_INV_LVL 0x80000000 68 #define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1) 69 #define CIPSO_V4_MAX_REM_CATS 65534 70 #define CIPSO_V4_INV_CAT 0x80000000 71 #define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1) 72 73 /* 74 * CIPSO DOI definitions 75 */ 76 77 /* DOI definition struct */ 78 #define CIPSO_V4_TAG_MAXCNT 5 79 struct cipso_v4_doi { 80 u32 doi; 81 u32 type; 82 union { 83 struct cipso_v4_std_map_tbl *std; 84 } map; 85 u8 tags[CIPSO_V4_TAG_MAXCNT]; 86 87 atomic_t refcount; 88 struct list_head list; 89 struct rcu_head rcu; 90 }; 91 92 /* Standard CIPSO mapping table */ 93 /* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the 94 * bit is set then consider that value as unspecified, meaning the 95 * mapping for that particular level/category is invalid */ 96 struct cipso_v4_std_map_tbl { 97 struct { 98 u32 *cipso; 99 u32 *local; 100 u32 cipso_size; 101 u32 local_size; 102 } lvl; 103 struct { 104 u32 *cipso; 105 u32 *local; 106 u32 cipso_size; 107 u32 local_size; 108 } cat; 109 }; 110 111 /* 112 * Sysctl Variables 113 */ 114 115 #ifdef CONFIG_NETLABEL 116 extern int cipso_v4_cache_enabled; 117 extern int cipso_v4_cache_bucketsize; 118 extern int cipso_v4_rbm_optfmt; 119 extern int cipso_v4_rbm_strictvalid; 120 #endif 121 122 /* 123 * Helper Functions 124 */ 125 126 #define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0) 127 #define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso) 128 129 /* 130 * DOI List Functions 131 */ 132 133 #ifdef CONFIG_NETLABEL 134 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, 135 struct netlbl_audit *audit_info); 136 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def); 137 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info); 138 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi); 139 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def); 140 int cipso_v4_doi_walk(u32 *skip_cnt, 141 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 142 void *cb_arg); 143 #else 144 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, 145 struct netlbl_audit *audit_info) 146 { 147 return -ENOSYS; 148 } 149 150 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) 151 { 152 return; 153 } 154 155 static inline int cipso_v4_doi_remove(u32 doi, 156 struct netlbl_audit *audit_info) 157 { 158 return 0; 159 } 160 161 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) 162 { 163 return NULL; 164 } 165 166 static inline int cipso_v4_doi_walk(u32 *skip_cnt, 167 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 168 void *cb_arg) 169 { 170 return 0; 171 } 172 173 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, 174 const char *domain) 175 { 176 return -ENOSYS; 177 } 178 179 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, 180 const char *domain) 181 { 182 return 0; 183 } 184 #endif /* CONFIG_NETLABEL */ 185 186 /* 187 * Label Mapping Cache Functions 188 */ 189 190 #ifdef CONFIG_NETLABEL 191 void cipso_v4_cache_invalidate(void); 192 int cipso_v4_cache_add(const struct sk_buff *skb, 193 const struct netlbl_lsm_secattr *secattr); 194 #else 195 static inline void cipso_v4_cache_invalidate(void) 196 { 197 return; 198 } 199 200 static inline int cipso_v4_cache_add(const struct sk_buff *skb, 201 const struct netlbl_lsm_secattr *secattr) 202 { 203 return 0; 204 } 205 #endif /* CONFIG_NETLABEL */ 206 207 /* 208 * Protocol Handling Functions 209 */ 210 211 #ifdef CONFIG_NETLABEL 212 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway); 213 int cipso_v4_sock_setattr(struct sock *sk, 214 const struct cipso_v4_doi *doi_def, 215 const struct netlbl_lsm_secattr *secattr); 216 void cipso_v4_sock_delattr(struct sock *sk); 217 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); 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 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option); 225 #else 226 static inline void cipso_v4_error(struct sk_buff *skb, 227 int error, 228 u32 gateway) 229 { 230 return; 231 } 232 233 static inline int cipso_v4_sock_setattr(struct sock *sk, 234 const struct cipso_v4_doi *doi_def, 235 const struct netlbl_lsm_secattr *secattr) 236 { 237 return -ENOSYS; 238 } 239 240 static inline void cipso_v4_sock_delattr(struct sock *sk) 241 { 242 } 243 244 static inline int cipso_v4_sock_getattr(struct sock *sk, 245 struct netlbl_lsm_secattr *secattr) 246 { 247 return -ENOSYS; 248 } 249 250 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb, 251 const struct cipso_v4_doi *doi_def, 252 const struct netlbl_lsm_secattr *secattr) 253 { 254 return -ENOSYS; 255 } 256 257 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb) 258 { 259 return -ENOSYS; 260 } 261 262 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 263 struct netlbl_lsm_secattr *secattr) 264 { 265 return -ENOSYS; 266 } 267 268 static inline int cipso_v4_validate(const struct sk_buff *skb, 269 unsigned char **option) 270 { 271 return -ENOSYS; 272 } 273 #endif /* CONFIG_NETLABEL */ 274 275 #endif /* _CIPSO_IPV4_H */ 276