LXR linux/include/net/cipso

   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
  74struct 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 */
  92struct 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
 112extern int cipso_v4_cache_enabled;
 113extern int cipso_v4_cache_bucketsize;
 114extern int cipso_v4_rbm_optfmt;
 115extern 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
 130int cipso_v4_doi_add(struct cipso_v4_doi *doi_def);
 131int cipso_v4_doi_remove(u32 doi,
 132                        struct netlbl_audit *audit_info,
 133                        void (*callback) (struct rcu_head * head));
 134struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
 135int cipso_v4_doi_walk(u32 *skip_cnt,
 136                     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 137                     void *cb_arg);
 138int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, const char *domain);
 139int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
 140                               const char *domain);
 141#else
 142static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def)
 143{
 144        return -ENOSYS;
 145}
 146
 147static 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
 154static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
 155{
 156        return NULL;
 157}
 158
 159static 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
 166static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
 167                                          const char *domain)
 168{
 169        return -ENOSYS;
 170}
 171
 172static 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
 184void cipso_v4_cache_invalidate(void);
 185int cipso_v4_cache_add(const struct sk_buff *skb,
 186                       const struct netlbl_lsm_secattr *secattr);
 187#else
 188static inline void cipso_v4_cache_invalidate(void)
 189{
 190        return;
 191}
 192
 193static 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
 205void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
 206int cipso_v4_sock_setattr(struct sock *sk,
 207                          const struct cipso_v4_doi *doi_def,
 208                          const struct netlbl_lsm_secattr *secattr);
 209int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
 210int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 211                            struct netlbl_lsm_secattr *secattr);
 212int cipso_v4_validate(unsigned char **option);
 213#else
 214static inline void cipso_v4_error(struct sk_buff *skb,
 215                                  int error,
 216                                  u32 gateway)
 217{
 218        return;
 219}
 220
 221static 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
 228static inline int cipso_v4_sock_getattr(struct sock *sk,
 229                                        struct netlbl_lsm_secattr *secattr)
 230{
 231        return -ENOSYS;
 232}
 233
 234static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 235                                          struct netlbl_lsm_secattr *secattr)
 236{
 237        return -ENOSYS;
 238}
 239
 240static inline int cipso_v4_validate(unsigned char **option)
 241{
 242        return -ENOSYS;
 243}
 244#endif /* CONFIG_NETLABEL */
 245
 246#endif /* _CIPSO_IPV4_H */
 247