include/net/cipso_ipv4.h

   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, see <http://www.gnu.org/licenses/>.
  30  *
  31  */
  32
  33 #ifndef _CIPSO_IPV4_H
  34 #define _CIPSO_IPV4_H
  35
  36 #include <linux/types.h>
  37 #include <linux/rcupdate.h>
  38 #include <linux/list.h>
  39 #include <linux/net.h>
  40 #include <linux/skbuff.h>
  41 #include <net/netlabel.h>
  42 #include <net/request_sock.h>
  43 #include <linux/atomic.h>
  44 #include <asm/unaligned.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  * DOI List Functions
 125  */
 126
 127 #ifdef CONFIG_NETLABEL
 128 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
 129                      struct netlbl_audit *audit_info);
 130 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
 131 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
 132 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
 133 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
 134 int cipso_v4_doi_walk(u32 *skip_cnt,
 135                      int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 136                      void *cb_arg);
 137 #else
 138 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
 139                                    struct netlbl_audit *audit_info)
 140 {
 141         return -ENOSYS;
 142 }
 143
 144 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
 145 {
 146         return;
 147 }
 148
 149 static inline int cipso_v4_doi_remove(u32 doi,
 150                                       struct netlbl_audit *audit_info)
 151 {
 152         return 0;
 153 }
 154
 155 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
 156 {
 157         return NULL;
 158 }
 159
 160 static inline int cipso_v4_doi_walk(u32 *skip_cnt,
 161                      int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 162                      void *cb_arg)
 163 {
 164         return 0;
 165 }
 166
 167 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
 168                                           const char *domain)
 169 {
 170         return -ENOSYS;
 171 }
 172
 173 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
 174                                              const char *domain)
 175 {
 176         return 0;
 177 }
 178 #endif /* CONFIG_NETLABEL */
 179
 180 /*
 181  * Label Mapping Cache Functions
 182  */
 183
 184 #ifdef CONFIG_NETLABEL
 185 void cipso_v4_cache_invalidate(void);
 186 int cipso_v4_cache_add(const unsigned char *cipso_ptr,
 187                        const struct netlbl_lsm_secattr *secattr);
 188 #else
 189 static inline void cipso_v4_cache_invalidate(void)
 190 {
 191         return;
 192 }
 193
 194 static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
 195                                      const struct netlbl_lsm_secattr *secattr)
 196 {
 197         return 0;
 198 }
 199 #endif /* CONFIG_NETLABEL */
 200
 201 /*
 202  * Protocol Handling Functions
 203  */
 204
 205 #ifdef CONFIG_NETLABEL
 206 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
 207 int cipso_v4_getattr(const unsigned char *cipso,
 208                      struct netlbl_lsm_secattr *secattr);
 209 int cipso_v4_sock_setattr(struct sock *sk,
 210                           const struct cipso_v4_doi *doi_def,
 211                           const struct netlbl_lsm_secattr *secattr);
 212 void cipso_v4_sock_delattr(struct sock *sk);
 213 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
 214 int cipso_v4_req_setattr(struct request_sock *req,
 215                          const struct cipso_v4_doi *doi_def,
 216                          const struct netlbl_lsm_secattr *secattr);
 217 void cipso_v4_req_delattr(struct request_sock *req);
 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 unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
 225 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
 226 #else
 227 static inline void cipso_v4_error(struct sk_buff *skb,
 228                                   int error,
 229                                   u32 gateway)
 230 {
 231         return;
 232 }
 233
 234 static inline int cipso_v4_getattr(const unsigned char *cipso,
 235                                    struct netlbl_lsm_secattr *secattr)
 236 {
 237         return -ENOSYS;
 238 }
 239
 240 static inline int cipso_v4_sock_setattr(struct sock *sk,
 241                                       const struct cipso_v4_doi *doi_def,
 242                                       const struct netlbl_lsm_secattr *secattr)
 243 {
 244         return -ENOSYS;
 245 }
 246
 247 static inline void cipso_v4_sock_delattr(struct sock *sk)
 248 {
 249 }
 250
 251 static inline int cipso_v4_sock_getattr(struct sock *sk,
 252                                         struct netlbl_lsm_secattr *secattr)
 253 {
 254         return -ENOSYS;
 255 }
 256
 257 static inline int cipso_v4_req_setattr(struct request_sock *req,
 258                                        const struct cipso_v4_doi *doi_def,
 259                                        const struct netlbl_lsm_secattr *secattr)
 260 {
 261         return -ENOSYS;
 262 }
 263
 264 static inline void cipso_v4_req_delattr(struct request_sock *req)
 265 {
 266         return;
 267 }
 268
 269 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 270                                       const struct cipso_v4_doi *doi_def,
 271                                       const struct netlbl_lsm_secattr *secattr)
 272 {
 273         return -ENOSYS;
 274 }
 275
 276 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
 277 {
 278         return -ENOSYS;
 279 }
 280
 281 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 282                                           struct netlbl_lsm_secattr *secattr)
 283 {
 284         return -ENOSYS;
 285 }
 286
 287 static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
 288 {
 289         return NULL;
 290 }
 291
 292 static inline int cipso_v4_validate(const struct sk_buff *skb,
 293                                     unsigned char **option)
 294 {
 295         unsigned char *opt = *option;
 296         unsigned char err_offset = 0;
 297         u8 opt_len = opt[1];
 298         u8 opt_iter;
 299         u8 tag_len;
 300
 301         if (opt_len < 8) {
 302                 err_offset = 1;
 303                 goto out;
 304         }
 305
 306         if (get_unaligned_be32(&opt[2]) == 0) {
 307                 err_offset = 2;
 308                 goto out;
 309         }
 310
 311         for (opt_iter = 6; opt_iter < opt_len;) {
 312                 if (opt_iter + 1 == opt_len) {
 313                         err_offset = opt_iter;
 314                         goto out;
 315                 }
 316                 tag_len = opt[opt_iter + 1];
 317                 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
 318                         err_offset = opt_iter + 1;
 319                         goto out;
 320                 }
 321                 opt_iter += tag_len;
 322         }
 323
 324 out:
 325         *option = opt + err_offset;
 326         return err_offset;
 327
 328 }
 329 #endif /* CONFIG_NETLABEL */
 330
 331 #endif /* _CIPSO_IPV4_H */