linux/include/net/cipso_ipv4.h
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   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/* standard 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/* non-standard tag types (tags > 127) */
  57#define CIPSO_V4_TAG_LOCAL            128
  58
  59/* doi mapping types */
  60#define CIPSO_V4_MAP_UNKNOWN          0
  61#define CIPSO_V4_MAP_TRANS            1
  62#define CIPSO_V4_MAP_PASS             2
  63#define CIPSO_V4_MAP_LOCAL            3
  64
  65/* limits */
  66#define CIPSO_V4_MAX_REM_LVLS         255
  67#define CIPSO_V4_INV_LVL              0x80000000
  68#define CIPSO_V4_MAX_LOC_LVLS         (CIPSO_V4_INV_LVL - 1)
  69#define CIPSO_V4_MAX_REM_CATS         65534
  70#define CIPSO_V4_INV_CAT              0x80000000
  71#define CIPSO_V4_MAX_LOC_CATS         (CIPSO_V4_INV_CAT - 1)
  72
  73/*
  74 * CIPSO DOI definitions
  75 */
  76
  77/* DOI definition struct */
  78#define CIPSO_V4_TAG_MAXCNT           5
  79struct cipso_v4_doi {
  80        u32 doi;
  81        u32 type;
  82        union {
  83                struct cipso_v4_std_map_tbl *std;
  84        } map;
  85        u8 tags[CIPSO_V4_TAG_MAXCNT];
  86
  87        atomic_t refcount;
  88        struct list_head list;
  89        struct rcu_head rcu;
  90};
  91
  92/* Standard CIPSO mapping table */
  93/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
  94 *       bit is set then consider that value as unspecified, meaning the
  95 *       mapping for that particular level/category is invalid */
  96struct cipso_v4_std_map_tbl {
  97        struct {
  98                u32 *cipso;
  99                u32 *local;
 100                u32 cipso_size;
 101                u32 local_size;
 102        } lvl;
 103        struct {
 104                u32 *cipso;
 105                u32 *local;
 106                u32 cipso_size;
 107                u32 local_size;
 108        } cat;
 109};
 110
 111/*
 112 * Sysctl Variables
 113 */
 114
 115#ifdef CONFIG_NETLABEL
 116extern int cipso_v4_cache_enabled;
 117extern int cipso_v4_cache_bucketsize;
 118extern int cipso_v4_rbm_optfmt;
 119extern int cipso_v4_rbm_strictvalid;
 120#endif
 121
 122/*
 123 * Helper Functions
 124 */
 125
 126#define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
 127#define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
 128
 129/*
 130 * DOI List Functions
 131 */
 132
 133#ifdef CONFIG_NETLABEL
 134int cipso_v4_doi_add(struct cipso_v4_doi *doi_def);
 135void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
 136int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
 137struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
 138void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
 139int cipso_v4_doi_walk(u32 *skip_cnt,
 140                     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 141                     void *cb_arg);
 142#else
 143static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def)
 144{
 145        return -ENOSYS;
 146}
 147
 148static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
 149{
 150        return;
 151}
 152
 153static inline int cipso_v4_doi_remove(u32 doi,
 154                                      struct netlbl_audit *audit_info)
 155{
 156        return 0;
 157}
 158
 159static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
 160{
 161        return NULL;
 162}
 163
 164static inline int cipso_v4_doi_walk(u32 *skip_cnt,
 165                     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 166                     void *cb_arg)
 167{
 168        return 0;
 169}
 170
 171static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
 172                                          const char *domain)
 173{
 174        return -ENOSYS;
 175}
 176
 177static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
 178                                             const char *domain)
 179{
 180        return 0;
 181}
 182#endif /* CONFIG_NETLABEL */
 183
 184/*
 185 * Label Mapping Cache Functions
 186 */
 187
 188#ifdef CONFIG_NETLABEL
 189void cipso_v4_cache_invalidate(void);
 190int cipso_v4_cache_add(const struct sk_buff *skb,
 191                       const struct netlbl_lsm_secattr *secattr);
 192#else
 193static inline void cipso_v4_cache_invalidate(void)
 194{
 195        return;
 196}
 197
 198static inline int cipso_v4_cache_add(const struct sk_buff *skb,
 199                                     const struct netlbl_lsm_secattr *secattr)
 200{
 201        return 0;
 202}
 203#endif /* CONFIG_NETLABEL */
 204
 205/*
 206 * Protocol Handling Functions
 207 */
 208
 209#ifdef CONFIG_NETLABEL
 210void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
 211int cipso_v4_sock_setattr(struct sock *sk,
 212                          const struct cipso_v4_doi *doi_def,
 213                          const struct netlbl_lsm_secattr *secattr);
 214void cipso_v4_sock_delattr(struct sock *sk);
 215int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
 216int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 217                            const struct cipso_v4_doi *doi_def,
 218                            const struct netlbl_lsm_secattr *secattr);
 219int cipso_v4_skbuff_delattr(struct sk_buff *skb);
 220int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 221                            struct netlbl_lsm_secattr *secattr);
 222int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
 223#else
 224static inline void cipso_v4_error(struct sk_buff *skb,
 225                                  int error,
 226                                  u32 gateway)
 227{
 228        return;
 229}
 230
 231static inline int cipso_v4_sock_setattr(struct sock *sk,
 232                                      const struct cipso_v4_doi *doi_def,
 233                                      const struct netlbl_lsm_secattr *secattr)
 234{
 235        return -ENOSYS;
 236}
 237
 238static inline void cipso_v4_sock_delattr(struct sock *sk)
 239{
 240}
 241
 242static inline int cipso_v4_sock_getattr(struct sock *sk,
 243                                        struct netlbl_lsm_secattr *secattr)
 244{
 245        return -ENOSYS;
 246}
 247
 248static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 249                                      const struct cipso_v4_doi *doi_def,
 250                                      const struct netlbl_lsm_secattr *secattr)
 251{
 252        return -ENOSYS;
 253}
 254
 255static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
 256{
 257        return -ENOSYS;
 258}
 259
 260static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 261                                          struct netlbl_lsm_secattr *secattr)
 262{
 263        return -ENOSYS;
 264}
 265
 266static inline int cipso_v4_validate(const struct sk_buff *skb,
 267                                    unsigned char **option)
 268{
 269        return -ENOSYS;
 270}
 271#endif /* CONFIG_NETLABEL */
 272
 273#endif /* _CIPSO_IPV4_H */
 274
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