1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * CIPSO - Commercial IP Security Option 4 * 5 * This is an implementation of the CIPSO 2.2 protocol as specified in 6 * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in 7 * FIPS-188, copies of both documents can be found in the Documentation 8 * directory. While CIPSO never became a full IETF RFC standard many vendors 9 * have chosen to adopt the protocol and over the years it has become a 10 * de-facto standard for labeled networking. 11 * 12 * Author: Paul Moore <paul@paul-moore.com> 13 */ 14 15 /* 16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 17 */ 18 19 #ifndef _CIPSO_IPV4_H 20 #define _CIPSO_IPV4_H 21 22 #include <linux/types.h> 23 #include <linux/rcupdate.h> 24 #include <linux/list.h> 25 #include <linux/net.h> 26 #include <linux/skbuff.h> 27 #include <net/netlabel.h> 28 #include <net/request_sock.h> 29 #include <linux/atomic.h> 30 #include <linux/refcount.h> 31 #include <asm/unaligned.h> 32 33 /* known doi values */ 34 #define CIPSO_V4_DOI_UNKNOWN 0x00000000 35 36 /* standard tag types */ 37 #define CIPSO_V4_TAG_INVALID 0 38 #define CIPSO_V4_TAG_RBITMAP 1 39 #define CIPSO_V4_TAG_ENUM 2 40 #define CIPSO_V4_TAG_RANGE 5 41 #define CIPSO_V4_TAG_PBITMAP 6 42 #define CIPSO_V4_TAG_FREEFORM 7 43 44 /* non-standard tag types (tags > 127) */ 45 #define CIPSO_V4_TAG_LOCAL 128 46 47 /* doi mapping types */ 48 #define CIPSO_V4_MAP_UNKNOWN 0 49 #define CIPSO_V4_MAP_TRANS 1 50 #define CIPSO_V4_MAP_PASS 2 51 #define CIPSO_V4_MAP_LOCAL 3 52 53 /* limits */ 54 #define CIPSO_V4_MAX_REM_LVLS 255 55 #define CIPSO_V4_INV_LVL 0x80000000 56 #define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1) 57 #define CIPSO_V4_MAX_REM_CATS 65534 58 #define CIPSO_V4_INV_CAT 0x80000000 59 #define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1) 60 61 /* 62 * CIPSO DOI definitions 63 */ 64 65 /* DOI definition struct */ 66 #define CIPSO_V4_TAG_MAXCNT 5 67 struct cipso_v4_doi { 68 u32 doi; 69 u32 type; 70 union { 71 struct cipso_v4_std_map_tbl *std; 72 } map; 73 u8 tags[CIPSO_V4_TAG_MAXCNT]; 74 75 refcount_t refcount; 76 struct list_head list; 77 struct rcu_head rcu; 78 }; 79 80 /* Standard CIPSO mapping table */ 81 /* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the 82 * bit is set then consider that value as unspecified, meaning the 83 * mapping for that particular level/category is invalid */ 84 struct cipso_v4_std_map_tbl { 85 struct { 86 u32 *cipso; 87 u32 *local; 88 u32 cipso_size; 89 u32 local_size; 90 } lvl; 91 struct { 92 u32 *cipso; 93 u32 *local; 94 u32 cipso_size; 95 u32 local_size; 96 } cat; 97 }; 98 99 /* 100 * Sysctl Variables 101 */ 102 103 #ifdef CONFIG_NETLABEL 104 extern int cipso_v4_cache_enabled; 105 extern int cipso_v4_cache_bucketsize; 106 extern int cipso_v4_rbm_optfmt; 107 extern int cipso_v4_rbm_strictvalid; 108 #endif 109 110 /* 111 * DOI List Functions 112 */ 113 114 #ifdef CONFIG_NETLABEL 115 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, 116 struct netlbl_audit *audit_info); 117 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def); 118 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info); 119 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi); 120 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def); 121 int cipso_v4_doi_walk(u32 *skip_cnt, 122 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 123 void *cb_arg); 124 #else 125 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, 126 struct netlbl_audit *audit_info) 127 { 128 return -ENOSYS; 129 } 130 131 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) 132 { 133 return; 134 } 135 136 static inline int cipso_v4_doi_remove(u32 doi, 137 struct netlbl_audit *audit_info) 138 { 139 return 0; 140 } 141 142 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) 143 { 144 return NULL; 145 } 146 147 static inline int cipso_v4_doi_walk(u32 *skip_cnt, 148 int (*callback) (struct cipso_v4_doi *doi_def, void *arg), 149 void *cb_arg) 150 { 151 return 0; 152 } 153 154 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, 155 const char *domain) 156 { 157 return -ENOSYS; 158 } 159 160 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, 161 const char *domain) 162 { 163 return 0; 164 } 165 #endif /* CONFIG_NETLABEL */ 166 167 /* 168 * Label Mapping Cache Functions 169 */ 170 171 #ifdef CONFIG_NETLABEL 172 void cipso_v4_cache_invalidate(void); 173 int cipso_v4_cache_add(const unsigned char *cipso_ptr, 174 const struct netlbl_lsm_secattr *secattr); 175 #else 176 static inline void cipso_v4_cache_invalidate(void) 177 { 178 return; 179 } 180 181 static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr, 182 const struct netlbl_lsm_secattr *secattr) 183 { 184 return 0; 185 } 186 #endif /* CONFIG_NETLABEL */ 187 188 /* 189 * Protocol Handling Functions 190 */ 191 192 #ifdef CONFIG_NETLABEL 193 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway); 194 int cipso_v4_getattr(const unsigned char *cipso, 195 struct netlbl_lsm_secattr *secattr); 196 int cipso_v4_sock_setattr(struct sock *sk, 197 const struct cipso_v4_doi *doi_def, 198 const struct netlbl_lsm_secattr *secattr); 199 void cipso_v4_sock_delattr(struct sock *sk); 200 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); 201 int cipso_v4_req_setattr(struct request_sock *req, 202 const struct cipso_v4_doi *doi_def, 203 const struct netlbl_lsm_secattr *secattr); 204 void cipso_v4_req_delattr(struct request_sock *req); 205 int cipso_v4_skbuff_setattr(struct sk_buff *skb, 206 const struct cipso_v4_doi *doi_def, 207 const struct netlbl_lsm_secattr *secattr); 208 int cipso_v4_skbuff_delattr(struct sk_buff *skb); 209 int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 210 struct netlbl_lsm_secattr *secattr); 211 unsigned char *cipso_v4_optptr(const struct sk_buff *skb); 212 int cipso_v4_validate(const struct sk_buff *skb, 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_getattr(const unsigned char *cipso, 222 struct netlbl_lsm_secattr *secattr) 223 { 224 return -ENOSYS; 225 } 226 227 static inline int cipso_v4_sock_setattr(struct sock *sk, 228 const struct cipso_v4_doi *doi_def, 229 const struct netlbl_lsm_secattr *secattr) 230 { 231 return -ENOSYS; 232 } 233 234 static inline void cipso_v4_sock_delattr(struct sock *sk) 235 { 236 } 237 238 static inline int cipso_v4_sock_getattr(struct sock *sk, 239 struct netlbl_lsm_secattr *secattr) 240 { 241 return -ENOSYS; 242 } 243 244 static inline int cipso_v4_req_setattr(struct request_sock *req, 245 const struct cipso_v4_doi *doi_def, 246 const struct netlbl_lsm_secattr *secattr) 247 { 248 return -ENOSYS; 249 } 250 251 static inline void cipso_v4_req_delattr(struct request_sock *req) 252 { 253 return; 254 } 255 256 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb, 257 const struct cipso_v4_doi *doi_def, 258 const struct netlbl_lsm_secattr *secattr) 259 { 260 return -ENOSYS; 261 } 262 263 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb) 264 { 265 return -ENOSYS; 266 } 267 268 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 269 struct netlbl_lsm_secattr *secattr) 270 { 271 return -ENOSYS; 272 } 273 274 static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb) 275 { 276 return NULL; 277 } 278 279 static inline int cipso_v4_validate(const struct sk_buff *skb, 280 unsigned char **option) 281 { 282 unsigned char *opt = *option; 283 unsigned char err_offset = 0; 284 u8 opt_len = opt[1]; 285 u8 opt_iter; 286 u8 tag_len; 287 288 if (opt_len < 8) { 289 err_offset = 1; 290 goto out; 291 } 292 293 if (get_unaligned_be32(&opt[2]) == 0) { 294 err_offset = 2; 295 goto out; 296 } 297 298 for (opt_iter = 6; opt_iter < opt_len;) { 299 if (opt_iter + 1 == opt_len) { 300 err_offset = opt_iter; 301 goto out; 302 } 303 tag_len = opt[opt_iter + 1]; 304 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) { 305 err_offset = opt_iter + 1; 306 goto out; 307 } 308 opt_iter += tag_len; 309 } 310 311 out: 312 *option = opt + err_offset; 313 return err_offset; 314 315 } 316 #endif /* CONFIG_NETLABEL */ 317 318 #endif /* _CIPSO_IPV4_H */ 319