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@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, 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 <linux/atomic.h>
  45#include <asm/unaligned.h>
  46
  47/* known doi values */
  48#define CIPSO_V4_DOI_UNKNOWN          0x00000000
  49
  50/* standard tag types */
  51#define CIPSO_V4_TAG_INVALID          0
  52#define CIPSO_V4_TAG_RBITMAP          1
  53#define CIPSO_V4_TAG_ENUM             2
  54#define CIPSO_V4_TAG_RANGE            5
  55#define CIPSO_V4_TAG_PBITMAP          6
  56#define CIPSO_V4_TAG_FREEFORM         7
  57
  58/* non-standard tag types (tags > 127) */
  59#define CIPSO_V4_TAG_LOCAL            128
  60
  61/* doi mapping types */
  62#define CIPSO_V4_MAP_UNKNOWN          0
  63#define CIPSO_V4_MAP_TRANS            1
  64#define CIPSO_V4_MAP_PASS             2
  65#define CIPSO_V4_MAP_LOCAL            3
  66
  67/* limits */
  68#define CIPSO_V4_MAX_REM_LVLS         255
  69#define CIPSO_V4_INV_LVL              0x80000000
  70#define CIPSO_V4_MAX_LOC_LVLS         (CIPSO_V4_INV_LVL - 1)
  71#define CIPSO_V4_MAX_REM_CATS         65534
  72#define CIPSO_V4_INV_CAT              0x80000000
  73#define CIPSO_V4_MAX_LOC_CATS         (CIPSO_V4_INV_CAT - 1)
  74
  75/*
  76 * CIPSO DOI definitions
  77 */
  78
  79/* DOI definition struct */
  80#define CIPSO_V4_TAG_MAXCNT           5
  81struct cipso_v4_doi {
  82        u32 doi;
  83        u32 type;
  84        union {
  85                struct cipso_v4_std_map_tbl *std;
  86        } map;
  87        u8 tags[CIPSO_V4_TAG_MAXCNT];
  88
  89        atomic_t refcount;
  90        struct list_head list;
  91        struct rcu_head rcu;
  92};
  93
  94/* Standard CIPSO mapping table */
  95/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
  96 *       bit is set then consider that value as unspecified, meaning the
  97 *       mapping for that particular level/category is invalid */
  98struct cipso_v4_std_map_tbl {
  99        struct {
 100                u32 *cipso;
 101                u32 *local;
 102                u32 cipso_size;
 103                u32 local_size;
 104        } lvl;
 105        struct {
 106                u32 *cipso;
 107                u32 *local;
 108                u32 cipso_size;
 109                u32 local_size;
 110        } cat;
 111};
 112
 113/*
 114 * Sysctl Variables
 115 */
 116
 117#ifdef CONFIG_NETLABEL
 118extern int cipso_v4_cache_enabled;
 119extern int cipso_v4_cache_bucketsize;
 120extern int cipso_v4_rbm_optfmt;
 121extern int cipso_v4_rbm_strictvalid;
 122#endif
 123
 124/*
 125 * Helper Functions
 126 */
 127
 128#define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
 129#define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
 130
 131/*
 132 * DOI List Functions
 133 */
 134
 135#ifdef CONFIG_NETLABEL
 136int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
 137                     struct netlbl_audit *audit_info);
 138void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
 139int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
 140struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
 141void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
 142int cipso_v4_doi_walk(u32 *skip_cnt,
 143                     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 144                     void *cb_arg);
 145#else
 146static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
 147                                   struct netlbl_audit *audit_info)
 148{
 149        return -ENOSYS;
 150}
 151
 152static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
 153{
 154        return;
 155}
 156
 157static inline int cipso_v4_doi_remove(u32 doi,
 158                                      struct netlbl_audit *audit_info)
 159{
 160        return 0;
 161}
 162
 163static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
 164{
 165        return NULL;
 166}
 167
 168static inline int cipso_v4_doi_walk(u32 *skip_cnt,
 169                     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 170                     void *cb_arg)
 171{
 172        return 0;
 173}
 174
 175static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
 176                                          const char *domain)
 177{
 178        return -ENOSYS;
 179}
 180
 181static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
 182                                             const char *domain)
 183{
 184        return 0;
 185}
 186#endif /* CONFIG_NETLABEL */
 187
 188/*
 189 * Label Mapping Cache Functions
 190 */
 191
 192#ifdef CONFIG_NETLABEL
 193void cipso_v4_cache_invalidate(void);
 194int cipso_v4_cache_add(const struct sk_buff *skb,
 195                       const struct netlbl_lsm_secattr *secattr);
 196#else
 197static inline void cipso_v4_cache_invalidate(void)
 198{
 199        return;
 200}
 201
 202static inline int cipso_v4_cache_add(const struct sk_buff *skb,
 203                                     const struct netlbl_lsm_secattr *secattr)
 204{
 205        return 0;
 206}
 207#endif /* CONFIG_NETLABEL */
 208
 209/*
 210 * Protocol Handling Functions
 211 */
 212
 213#ifdef CONFIG_NETLABEL
 214void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
 215int cipso_v4_sock_setattr(struct sock *sk,
 216                          const struct cipso_v4_doi *doi_def,
 217                          const struct netlbl_lsm_secattr *secattr);
 218void cipso_v4_sock_delattr(struct sock *sk);
 219int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
 220int cipso_v4_req_setattr(struct request_sock *req,
 221                         const struct cipso_v4_doi *doi_def,
 222                         const struct netlbl_lsm_secattr *secattr);
 223void cipso_v4_req_delattr(struct request_sock *req);
 224int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 225                            const struct cipso_v4_doi *doi_def,
 226                            const struct netlbl_lsm_secattr *secattr);
 227int cipso_v4_skbuff_delattr(struct sk_buff *skb);
 228int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 229                            struct netlbl_lsm_secattr *secattr);
 230int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
 231#else
 232static inline void cipso_v4_error(struct sk_buff *skb,
 233                                  int error,
 234                                  u32 gateway)
 235{
 236        return;
 237}
 238
 239static inline int cipso_v4_sock_setattr(struct sock *sk,
 240                                      const struct cipso_v4_doi *doi_def,
 241                                      const struct netlbl_lsm_secattr *secattr)
 242{
 243        return -ENOSYS;
 244}
 245
 246static inline void cipso_v4_sock_delattr(struct sock *sk)
 247{
 248}
 249
 250static inline int cipso_v4_sock_getattr(struct sock *sk,
 251                                        struct netlbl_lsm_secattr *secattr)
 252{
 253        return -ENOSYS;
 254}
 255
 256static inline int cipso_v4_req_setattr(struct request_sock *req,
 257                                       const struct cipso_v4_doi *doi_def,
 258                                       const struct netlbl_lsm_secattr *secattr)
 259{
 260        return -ENOSYS;
 261}
 262
 263static inline void cipso_v4_req_delattr(struct request_sock *req)
 264{
 265        return;
 266}
 267
 268static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 269                                      const struct cipso_v4_doi *doi_def,
 270                                      const struct netlbl_lsm_secattr *secattr)
 271{
 272        return -ENOSYS;
 273}
 274
 275static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
 276{
 277        return -ENOSYS;
 278}
 279
 280static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 281                                          struct netlbl_lsm_secattr *secattr)
 282{
 283        return -ENOSYS;
 284}
 285
 286static inline int cipso_v4_validate(const struct sk_buff *skb,
 287                                    unsigned char **option)
 288{
 289        unsigned char *opt = *option;
 290        unsigned char err_offset = 0;
 291        u8 opt_len = opt[1];
 292        u8 opt_iter;
 293
 294        if (opt_len < 8) {
 295                err_offset = 1;
 296                goto out;
 297        }
 298
 299        if (get_unaligned_be32(&opt[2]) == 0) {
 300                err_offset = 2;
 301                goto out;
 302        }
 303
 304        for (opt_iter = 6; opt_iter < opt_len;) {
 305                if (opt[opt_iter + 1] > (opt_len - opt_iter)) {
 306                        err_offset = opt_iter + 1;
 307                        goto out;
 308                }
 309                opt_iter += opt[opt_iter + 1];
 310        }
 311
 312out:
 313        *option = opt + err_offset;
 314        return err_offset;
 315
 316}
 317#endif /* CONFIG_NETLABEL */
 318
 319#endif /* _CIPSO_IPV4_H */
 320
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