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 44 /* known doi values */ 45 #define CIPSO_V4_DOI_UNKNOWN 0x00000000 46 47 /* tag types */ 48 #define CIPSO_V4_TAG_INVALID 0 49 #define CIPSO_V4_TAG_RBITMAP 1 50 #define CIPSO_V4_TAG_ENUM 2 51 #define CIPSO_V4_TAG_RANGE 5 52 #define CIPSO_V4_TAG_PBITMAP 6 53 #define CIPSO_V4_TAG_FREEFORM 7 54 55 /* doi mapping types */ 56 #define CIPSO_V4_MAP_UNKNOWN 0 57 #define CIPSO_V4_MAP_STD 1 58 #define CIPSO_V4_MAP_PASS 2 59 60 /* limits */ 61 #define CIPSO_V4_MAX_REM_LVLS 255 62 #define CIPSO_V4_INV_LVL 0x80000000 63 #define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1) 64 #define CIPSO_V4_MAX_REM_CATS 65534 65 #define CIPSO_V4_INV_CAT 0x80000000 66 #define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1) 67 68 /* 69 * CIPSO DOI definitions 70 */ 71 72 /* DOI definition struct */ 73 #define CIPSO_V4_TAG_MAXCNT 5 74 struct cipso_v4_doi { 75 u32 doi; 76 u32 type; 77 union { 78 struct cipso_v4_std_map_tbl *std; 79 } map; 80 u8 tags[CIPSO_V4_TAG_MAXCNT]; 81 82 u32 valid; 83 struct list_head list; 84 struct rcu_head rcu; 85 struct list_head dom_list; 86 }; 87 88 /* Standard CIPSO mapping table */ 89 /* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the 90 * bit is set then consider that value as unspecified, meaning the 91 * mapping for that particular level/category is invalid */ 92 struct cipso_v4_std_map_tbl { 93 struct { 94 u32 *cipso; 95 u32 *local; 96 u32 cipso_size; 97 u32 local_size; 98 } lvl; 99 struct { 100 u32 *cipso; 101 u32 *local; 102 u32 cipso_size; 103 u32 local_size; 104 } cat; 105 }; 106 107 /* 108 * Sysctl Variables 109 */ 110 111 #ifdef CONFIG_NETLABEL 112 extern int cipso_v4_cache_enabled; 113 extern int cipso_v4_cache_bucketsize; 114 extern int cipso_v4_rbm_optfmt; 115 extern int cipso_v4_rbm_strictvalid; 116 #endif 117 118 /* 119 * Helper Functions 120 */ 121 122 #define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0) 123 #define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso) 124 125 /* 126 * DOI List Functions 127 */ 128 129 #ifdef CONFIG_NETLABEL 130 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def); 131 int cipso_v4_doi_remove(u32 doi, 132 struct netlbl_audit *audit_info, 133 void (*callback) (struct rcu_head * head)); 134 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi); 135 int cipso_v4_doi_walk(u32 *skip_cnt, 136 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 137 void *cb_arg); 138 int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, const char *domain); 139 int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, 140 const char *domain); 141 #else 142 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def) 143 { 144 return -ENOSYS; 145 } 146 147 static inline int cipso_v4_doi_remove(u32 doi, 148 struct netlbl_audit *audit_info, 149 void (*callback) (struct rcu_head * head)) 150 { 151 return 0; 152 } 153 154 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) 155 { 156 return NULL; 157 } 158 159 static inline int cipso_v4_doi_walk(u32 *skip_cnt, 160 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 161 void *cb_arg) 162 { 163 return 0; 164 } 165 166 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, 167 const char *domain) 168 { 169 return -ENOSYS; 170 } 171 172 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, 173 const char *domain) 174 { 175 return 0; 176 } 177 #endif /* CONFIG_NETLABEL */ 178 179 /* 180 * Label Mapping Cache Functions 181 */ 182 183 #ifdef CONFIG_NETLABEL 184 void cipso_v4_cache_invalidate(void); 185 int cipso_v4_cache_add(const struct sk_buff *skb, 186 const struct netlbl_lsm_secattr *secattr); 187 #else 188 static inline void cipso_v4_cache_invalidate(void) 189 { 190 return; 191 } 192 193 static inline int cipso_v4_cache_add(const struct sk_buff *skb, 194 const struct netlbl_lsm_secattr *secattr) 195 { 196 return 0; 197 } 198 #endif /* CONFIG_NETLABEL */ 199 200 /* 201 * Protocol Handling Functions 202 */ 203 204 #ifdef CONFIG_NETLABEL 205 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway); 206 int cipso_v4_sock_setattr(struct sock *sk, 207 const struct cipso_v4_doi *doi_def, 208 const struct netlbl_lsm_secattr *secattr); 209 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); 210 int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 211 struct netlbl_lsm_secattr *secattr); 212 int cipso_v4_validate(unsigned char **option); 213 #else 214 static inline void cipso_v4_error(struct sk_buff *skb, 215 int error, 216 u32 gateway) 217 { 218 return; 219 } 220 221 static inline int cipso_v4_sock_setattr(struct sock *sk, 222 const struct cipso_v4_doi *doi_def, 223 const struct netlbl_lsm_secattr *secattr) 224 { 225 return -ENOSYS; 226 } 227 228 static inline int cipso_v4_sock_getattr(struct sock *sk, 229 struct netlbl_lsm_secattr *secattr) 230 { 231 return -ENOSYS; 232 } 233 234 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 235 struct netlbl_lsm_secattr *secattr) 236 { 237 return -ENOSYS; 238 } 239 240 static inline int cipso_v4_validate(unsigned char **option) 241 { 242 return -ENOSYS; 243 } 244 #endif /* CONFIG_NETLABEL */ 245 246 #endif /* _CIPSO_IPV4_H */ 247