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#include <net/request_sock.h>
  44#include <asm/atomic.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
  80struct 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 */
  97struct 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
 117extern int cipso_v4_cache_enabled;
 118extern int cipso_v4_cache_bucketsize;
 119extern int cipso_v4_rbm_optfmt;
 120extern int cipso_v4_rbm_strictvalid;
 121#endif
 122
 123/*
 124 * Helper Functions
 125 */
 126
 127#define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
 128#define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
 129
 130/*
 131 * DOI List Functions
 132 */
 133
 134#ifdef CONFIG_NETLABEL
 135int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
 136                     struct netlbl_audit *audit_info);
 137void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
 138int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
 139struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
 140void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
 141int cipso_v4_doi_walk(u32 *skip_cnt,
 142                     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 143                     void *cb_arg);
 144#else
 145static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
 146                                   struct netlbl_audit *audit_info)
 147{
 148        return -ENOSYS;
 149}
 150
 151static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
 152{
 153        return;
 154}
 155
 156static inline int cipso_v4_doi_remove(u32 doi,
 157                                      struct netlbl_audit *audit_info)
 158{
 159        return 0;
 160}
 161
 162static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
 163{
 164        return NULL;
 165}
 166
 167static inline int cipso_v4_doi_walk(u32 *skip_cnt,
 168                     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 169                     void *cb_arg)
 170{
 171        return 0;
 172}
 173
 174static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
 175                                          const char *domain)
 176{
 177        return -ENOSYS;
 178}
 179
 180static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
 181                                             const char *domain)
 182{
 183        return 0;
 184}
 185#endif /* CONFIG_NETLABEL */
 186
 187/*
 188 * Label Mapping Cache Functions
 189 */
 190
 191#ifdef CONFIG_NETLABEL
 192void cipso_v4_cache_invalidate(void);
 193int cipso_v4_cache_add(const struct sk_buff *skb,
 194                       const struct netlbl_lsm_secattr *secattr);
 195#else
 196static inline void cipso_v4_cache_invalidate(void)
 197{
 198        return;
 199}
 200
 201static inline int cipso_v4_cache_add(const struct sk_buff *skb,
 202                                     const struct netlbl_lsm_secattr *secattr)
 203{
 204        return 0;
 205}
 206#endif /* CONFIG_NETLABEL */
 207
 208/*
 209 * Protocol Handling Functions
 210 */
 211
 212#ifdef CONFIG_NETLABEL
 213void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
 214int cipso_v4_sock_setattr(struct sock *sk,
 215                          const struct cipso_v4_doi *doi_def,
 216                          const struct netlbl_lsm_secattr *secattr);
 217void cipso_v4_sock_delattr(struct sock *sk);
 218int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
 219int cipso_v4_req_setattr(struct request_sock *req,
 220                         const struct cipso_v4_doi *doi_def,
 221                         const struct netlbl_lsm_secattr *secattr);
 222void cipso_v4_req_delattr(struct request_sock *req);
 223int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 224                            const struct cipso_v4_doi *doi_def,
 225                            const struct netlbl_lsm_secattr *secattr);
 226int cipso_v4_skbuff_delattr(struct sk_buff *skb);
 227int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 228                            struct netlbl_lsm_secattr *secattr);
 229int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
 230#else
 231static inline void cipso_v4_error(struct sk_buff *skb,
 232                                  int error,
 233                                  u32 gateway)
 234{
 235        return;
 236}
 237
 238static inline int cipso_v4_sock_setattr(struct sock *sk,
 239                                      const struct cipso_v4_doi *doi_def,
 240                                      const struct netlbl_lsm_secattr *secattr)
 241{
 242        return -ENOSYS;
 243}
 244
 245static inline void cipso_v4_sock_delattr(struct sock *sk)
 246{
 247}
 248
 249static inline int cipso_v4_sock_getattr(struct sock *sk,
 250                                        struct netlbl_lsm_secattr *secattr)
 251{
 252        return -ENOSYS;
 253}
 254
 255static inline int cipso_v4_req_setattr(struct request_sock *req,
 256                                       const struct cipso_v4_doi *doi_def,
 257                                       const struct netlbl_lsm_secattr *secattr)
 258{
 259        return -ENOSYS;
 260}
 261
 262static inline void cipso_v4_req_delattr(struct request_sock *req)
 263{
 264        return;
 265}
 266
 267static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 268                                      const struct cipso_v4_doi *doi_def,
 269                                      const struct netlbl_lsm_secattr *secattr)
 270{
 271        return -ENOSYS;
 272}
 273
 274static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
 275{
 276        return -ENOSYS;
 277}
 278
 279static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 280                                          struct netlbl_lsm_secattr *secattr)
 281{
 282        return -ENOSYS;
 283}
 284
 285static inline int cipso_v4_validate(const struct sk_buff *skb,
 286                                    unsigned char **option)
 287{
 288        return -ENOSYS;
 289}
 290#endif /* CONFIG_NETLABEL */
 291
 292#endif /* _CIPSO_IPV4_H */
 293