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.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 /* 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 /* doi mapping types */
  57 #define CIPSO_V4_MAP_UNKNOWN          0
  58 #define CIPSO_V4_MAP_STD              1
  59 #define CIPSO_V4_MAP_PASS             2
  60
  61 /* limits */
  62 #define CIPSO_V4_MAX_REM_LVLS         255
  63 #define CIPSO_V4_INV_LVL              0x80000000
  64 #define CIPSO_V4_MAX_LOC_LVLS         (CIPSO_V4_INV_LVL - 1)
  65 #define CIPSO_V4_MAX_REM_CATS         65534
  66 #define CIPSO_V4_INV_CAT              0x80000000
  67 #define CIPSO_V4_MAX_LOC_CATS         (CIPSO_V4_INV_CAT - 1)
  68
  69 /*
  70  * CIPSO DOI definitions
  71  */
  72
  73 /* DOI definition struct */
  74 #define CIPSO_V4_TAG_MAXCNT           5
  75 struct cipso_v4_doi {
  76         u32 doi;
  77         u32 type;
  78         union {
  79                 struct cipso_v4_std_map_tbl *std;
  80         } map;
  81         u8 tags[CIPSO_V4_TAG_MAXCNT];
  82
  83         atomic_t refcount;
  84         struct list_head list;
  85         struct rcu_head rcu;
  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 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
 132 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
 133 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
 134 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
 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 #else
 139 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def)
 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 struct sk_buff *skb,
 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 struct sk_buff *skb,
 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_sock_setattr(struct sock *sk,
 208                           const struct cipso_v4_doi *doi_def,
 209                           const struct netlbl_lsm_secattr *secattr);
 210 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
 211 int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 212                             const struct cipso_v4_doi *doi_def,
 213                             const struct netlbl_lsm_secattr *secattr);
 214 int cipso_v4_skbuff_delattr(struct sk_buff *skb);
 215 int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 216                             struct netlbl_lsm_secattr *secattr);
 217 int cipso_v4_validate(unsigned char **option);
 218 #else
 219 static inline void cipso_v4_error(struct sk_buff *skb,
 220                                   int error,
 221                                   u32 gateway)
 222 {
 223         return;
 224 }
 225
 226 static inline int cipso_v4_sock_setattr(struct sock *sk,
 227                                       const struct cipso_v4_doi *doi_def,
 228                                       const struct netlbl_lsm_secattr *secattr)
 229 {
 230         return -ENOSYS;
 231 }
 232
 233 static inline int cipso_v4_sock_getattr(struct sock *sk,
 234                                         struct netlbl_lsm_secattr *secattr)
 235 {
 236         return -ENOSYS;
 237 }
 238
 239 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 240                                       const struct cipso_v4_doi *doi_def,
 241                                       const struct netlbl_lsm_secattr *secattr)
 242 {
 243         return -ENOSYS;
 244 }
 245
 246 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
 247 {
 248         return -ENOSYS;
 249 }
 250
 251 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 252                                           struct netlbl_lsm_secattr *secattr)
 253 {
 254         return -ENOSYS;
 255 }
 256
 257 static inline int cipso_v4_validate(unsigned char **option)
 258 {
 259         return -ENOSYS;
 260 }
 261 #endif /* CONFIG_NETLABEL */
 262
 263 #endif /* _CIPSO_IPV4_H */