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 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def); 136 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info); 137 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi); 138 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def); 139 int cipso_v4_doi_walk(u32 *skip_cnt, 140 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 141 void *cb_arg); 142 #else 143 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def) 144 { 145 return -ENOSYS; 146 } 147 148 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) 149 { 150 return; 151 } 152 153 static inline int cipso_v4_doi_remove(u32 doi, 154 struct netlbl_audit *audit_info) 155 { 156 return 0; 157 } 158 159 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) 160 { 161 return NULL; 162 } 163 164 static inline int cipso_v4_doi_walk(u32 *skip_cnt, 165 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 166 void *cb_arg) 167 { 168 return 0; 169 } 170 171 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, 172 const char *domain) 173 { 174 return -ENOSYS; 175 } 176 177 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, 178 const char *domain) 179 { 180 return 0; 181 } 182 #endif /* CONFIG_NETLABEL */ 183 184 /* 185 * Label Mapping Cache Functions 186 */ 187 188 #ifdef CONFIG_NETLABEL 189 void cipso_v4_cache_invalidate(void); 190 int cipso_v4_cache_add(const struct sk_buff *skb, 191 const struct netlbl_lsm_secattr *secattr); 192 #else 193 static inline void cipso_v4_cache_invalidate(void) 194 { 195 return; 196 } 197 198 static inline int cipso_v4_cache_add(const struct sk_buff *skb, 199 const struct netlbl_lsm_secattr *secattr) 200 { 201 return 0; 202 } 203 #endif /* CONFIG_NETLABEL */ 204 205 /* 206 * Protocol Handling Functions 207 */ 208 209 #ifdef CONFIG_NETLABEL 210 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway); 211 int cipso_v4_sock_setattr(struct sock *sk, 212 const struct cipso_v4_doi *doi_def, 213 const struct netlbl_lsm_secattr *secattr); 214 void cipso_v4_sock_delattr(struct sock *sk); 215 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); 216 int cipso_v4_skbuff_setattr(struct sk_buff *skb, 217 const struct cipso_v4_doi *doi_def, 218 const struct netlbl_lsm_secattr *secattr); 219 int cipso_v4_skbuff_delattr(struct sk_buff *skb); 220 int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 221 struct netlbl_lsm_secattr *secattr); 222 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option); 223 #else 224 static inline void cipso_v4_error(struct sk_buff *skb, 225 int error, 226 u32 gateway) 227 { 228 return; 229 } 230 231 static inline int cipso_v4_sock_setattr(struct sock *sk, 232 const struct cipso_v4_doi *doi_def, 233 const struct netlbl_lsm_secattr *secattr) 234 { 235 return -ENOSYS; 236 } 237 238 static inline void cipso_v4_sock_delattr(struct sock *sk) 239 { 240 } 241 242 static inline int cipso_v4_sock_getattr(struct sock *sk, 243 struct netlbl_lsm_secattr *secattr) 244 { 245 return -ENOSYS; 246 } 247 248 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb, 249 const struct cipso_v4_doi *doi_def, 250 const struct netlbl_lsm_secattr *secattr) 251 { 252 return -ENOSYS; 253 } 254 255 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb) 256 { 257 return -ENOSYS; 258 } 259 260 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 261 struct netlbl_lsm_secattr *secattr) 262 { 263 return -ENOSYS; 264 } 265 266 static inline int cipso_v4_validate(const struct sk_buff *skb, 267 unsigned char **option) 268 { 269 return -ENOSYS; 270 } 271 #endif /* CONFIG_NETLABEL */ 272 273 #endif /* _CIPSO_IPV4_H */ 274