1 /* 2 * NetLabel System 3 * 4 * The NetLabel system manages static and dynamic label mappings for network 5 * protocols such as CIPSO and RIPSO. 6 * 7 * Author: Paul Moore <paul.moore@hp.com> 8 * 9 */ 10 11 /* 12 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or 17 * (at your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 22 * the GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, write to the Free Software 26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 27 * 28 */ 29 30 #ifndef _NETLABEL_H 31 #define _NETLABEL_H 32 33 #include <linux/types.h> 34 #include <linux/net.h> 35 #include <linux/skbuff.h> 36 #include <net/netlink.h> 37 #include <asm/atomic.h> 38 39 /* 40 * NetLabel - A management interface for maintaining network packet label 41 * mapping tables for explicit packet labling protocols. 42 * 43 * Network protocols such as CIPSO and RIPSO require a label translation layer 44 * to convert the label on the packet into something meaningful on the host 45 * machine. In the current Linux implementation these mapping tables live 46 * inside the kernel; NetLabel provides a mechanism for user space applications 47 * to manage these mapping tables. 48 * 49 * NetLabel makes use of the Generic NETLINK mechanism as a transport layer to 50 * send messages between kernel and user space. The general format of a 51 * NetLabel message is shown below: 52 * 53 * +-----------------+-------------------+--------- --- -- - 54 * | struct nlmsghdr | struct genlmsghdr | payload 55 * +-----------------+-------------------+--------- --- -- - 56 * 57 * The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal. 58 * The payload is dependent on the subsystem specified in the 59 * 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions 60 * should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c 61 * file. All of the fields in the NetLabel payload are NETLINK attributes, see 62 * the include/net/netlink.h file for more information on NETLINK attributes. 63 * 64 */ 65 66 /* 67 * NetLabel NETLINK protocol 68 */ 69 70 #define NETLBL_PROTO_VERSION 1 71 72 /* NetLabel NETLINK types/families */ 73 #define NETLBL_NLTYPE_NONE 0 74 #define NETLBL_NLTYPE_MGMT 1 75 #define NETLBL_NLTYPE_MGMT_NAME "NLBL_MGMT" 76 #define NETLBL_NLTYPE_RIPSO 2 77 #define NETLBL_NLTYPE_RIPSO_NAME "NLBL_RIPSO" 78 #define NETLBL_NLTYPE_CIPSOV4 3 79 #define NETLBL_NLTYPE_CIPSOV4_NAME "NLBL_CIPSOv4" 80 #define NETLBL_NLTYPE_CIPSOV6 4 81 #define NETLBL_NLTYPE_CIPSOV6_NAME "NLBL_CIPSOv6" 82 #define NETLBL_NLTYPE_UNLABELED 5 83 #define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL" 84 85 /* 86 * NetLabel - Kernel API for accessing the network packet label mappings. 87 * 88 * The following functions are provided for use by other kernel modules, 89 * specifically kernel LSM modules, to provide a consistent, transparent API 90 * for dealing with explicit packet labeling protocols such as CIPSO and 91 * RIPSO. The functions defined here are implemented in the 92 * net/netlabel/netlabel_kapi.c file. 93 * 94 */ 95 96 /* NetLabel audit information */ 97 struct netlbl_audit { 98 u32 secid; 99 uid_t loginuid; 100 }; 101 102 /* Domain mapping definition struct */ 103 struct netlbl_dom_map; 104 105 /* Domain mapping operations */ 106 int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info); 107 108 /* LSM security attributes */ 109 struct netlbl_lsm_cache { 110 atomic_t refcount; 111 void (*free) (const void *data); 112 void *data; 113 }; 114 #define NETLBL_SECATTR_NONE 0x00000000 115 #define NETLBL_SECATTR_DOMAIN 0x00000001 116 #define NETLBL_SECATTR_CACHE 0x00000002 117 #define NETLBL_SECATTR_MLS_LVL 0x00000004 118 #define NETLBL_SECATTR_MLS_CAT 0x00000008 119 struct netlbl_lsm_secattr { 120 u32 flags; 121 122 char *domain; 123 124 u32 mls_lvl; 125 unsigned char *mls_cat; 126 size_t mls_cat_len; 127 128 struct netlbl_lsm_cache *cache; 129 }; 130 131 /* 132 * LSM security attribute operations 133 */ 134 135 136 /** 137 * netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache 138 * @flags: the memory allocation flags 139 * 140 * Description: 141 * Allocate and initialize a netlbl_lsm_cache structure. Returns a pointer 142 * on success, NULL on failure. 143 * 144 */ 145 static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags) 146 { 147 struct netlbl_lsm_cache *cache; 148 149 cache = kzalloc(sizeof(*cache), flags); 150 if (cache) 151 atomic_set(&cache->refcount, 1); 152 return cache; 153 } 154 155 /** 156 * netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct 157 * @cache: the struct to free 158 * 159 * Description: 160 * Frees @secattr including all of the internal buffers. 161 * 162 */ 163 static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache) 164 { 165 if (!atomic_dec_and_test(&cache->refcount)) 166 return; 167 168 if (cache->free) 169 cache->free(cache->data); 170 kfree(cache); 171 } 172 173 /** 174 * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct 175 * @secattr: the struct to initialize 176 * 177 * Description: 178 * Initialize an already allocated netlbl_lsm_secattr struct. 179 * 180 */ 181 static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr) 182 { 183 secattr->flags = 0; 184 secattr->domain = NULL; 185 secattr->mls_cat = NULL; 186 secattr->cache = NULL; 187 } 188 189 /** 190 * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct 191 * @secattr: the struct to clear 192 * 193 * Description: 194 * Destroys the @secattr struct, including freeing all of the internal buffers. 195 * The struct must be reset with a call to netlbl_secattr_init() before reuse. 196 * 197 */ 198 static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr) 199 { 200 if (secattr->cache) 201 netlbl_secattr_cache_free(secattr->cache); 202 kfree(secattr->domain); 203 kfree(secattr->mls_cat); 204 } 205 206 /** 207 * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct 208 * @flags: the memory allocation flags 209 * 210 * Description: 211 * Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid 212 * pointer on success, or NULL on failure. 213 * 214 */ 215 static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags) 216 { 217 return kzalloc(sizeof(struct netlbl_lsm_secattr), flags); 218 } 219 220 /** 221 * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct 222 * @secattr: the struct to free 223 * 224 * Description: 225 * Frees @secattr including all of the internal buffers. 226 * 227 */ 228 static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr) 229 { 230 netlbl_secattr_destroy(secattr); 231 kfree(secattr); 232 } 233 234 /* 235 * LSM protocol operations 236 */ 237 238 #ifdef CONFIG_NETLABEL 239 int netlbl_socket_setattr(const struct socket *sock, 240 const struct netlbl_lsm_secattr *secattr); 241 int netlbl_sock_getattr(struct sock *sk, 242 struct netlbl_lsm_secattr *secattr); 243 int netlbl_socket_getattr(const struct socket *sock, 244 struct netlbl_lsm_secattr *secattr); 245 int netlbl_skbuff_getattr(const struct sk_buff *skb, 246 struct netlbl_lsm_secattr *secattr); 247 void netlbl_skbuff_err(struct sk_buff *skb, int error); 248 #else 249 static inline int netlbl_socket_setattr(const struct socket *sock, 250 const struct netlbl_lsm_secattr *secattr) 251 { 252 return -ENOSYS; 253 } 254 255 static inline int netlbl_sock_getattr(struct sock *sk, 256 struct netlbl_lsm_secattr *secattr) 257 { 258 return -ENOSYS; 259 } 260 261 static inline int netlbl_socket_getattr(const struct socket *sock, 262 struct netlbl_lsm_secattr *secattr) 263 { 264 return -ENOSYS; 265 } 266 267 static inline int netlbl_skbuff_getattr(const struct sk_buff *skb, 268 struct netlbl_lsm_secattr *secattr) 269 { 270 return -ENOSYS; 271 } 272 273 static inline void netlbl_skbuff_err(struct sk_buff *skb, int error) 274 { 275 return; 276 } 277 #endif /* CONFIG_NETLABEL */ 278 279 /* 280 * LSM label mapping cache operations 281 */ 282 283 #ifdef CONFIG_NETLABEL 284 void netlbl_cache_invalidate(void); 285 int netlbl_cache_add(const struct sk_buff *skb, 286 const struct netlbl_lsm_secattr *secattr); 287 #else 288 static inline void netlbl_cache_invalidate(void) 289 { 290 return; 291 } 292 293 static inline int netlbl_cache_add(const struct sk_buff *skb, 294 const struct netlbl_lsm_secattr *secattr) 295 { 296 return 0; 297 } 298 #endif /* CONFIG_NETLABEL */ 299 300 #endif /* _NETLABEL_H */ 301