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