4 * The NetLabel system manages static and dynamic label mappings for network
5 * protocols such as CIPSO and RIPSO.
7 * Author: Paul Moore <paul.moore@hp.com>
12 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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.
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.
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
33 #include <linux/types.h>
34 #include <linux/net.h>
35 #include <linux/skbuff.h>
36 #include <net/netlink.h>
39 * NetLabel - A management interface for maintaining network packet label
40 * mapping tables for explicit packet labling protocols.
42 * Network protocols such as CIPSO and RIPSO require a label translation layer
43 * to convert the label on the packet into something meaningful on the host
44 * machine. In the current Linux implementation these mapping tables live
45 * inside the kernel; NetLabel provides a mechanism for user space applications
46 * to manage these mapping tables.
48 * NetLabel makes use of the Generic NETLINK mechanism as a transport layer to
49 * send messages between kernel and user space. The general format of a
50 * NetLabel message is shown below:
52 * +-----------------+-------------------+--------- --- -- -
53 * | struct nlmsghdr | struct genlmsghdr | payload
54 * +-----------------+-------------------+--------- --- -- -
56 * The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal.
57 * The payload is dependent on the subsystem specified in the
58 * 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions
59 * should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c
60 * file. All of the fields in the NetLabel payload are NETLINK attributes, see
61 * the include/net/netlink.h file for more information on NETLINK attributes.
66 * NetLabel NETLINK protocol
69 #define NETLBL_PROTO_VERSION 1
71 /* NetLabel NETLINK types/families */
72 #define NETLBL_NLTYPE_NONE 0
73 #define NETLBL_NLTYPE_MGMT 1
74 #define NETLBL_NLTYPE_MGMT_NAME "NLBL_MGMT"
75 #define NETLBL_NLTYPE_RIPSO 2
76 #define NETLBL_NLTYPE_RIPSO_NAME "NLBL_RIPSO"
77 #define NETLBL_NLTYPE_CIPSOV4 3
78 #define NETLBL_NLTYPE_CIPSOV4_NAME "NLBL_CIPSOv4"
79 #define NETLBL_NLTYPE_CIPSOV6 4
80 #define NETLBL_NLTYPE_CIPSOV6_NAME "NLBL_CIPSOv6"
81 #define NETLBL_NLTYPE_UNLABELED 5
82 #define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL"
85 * NetLabel - Kernel API for accessing the network packet label mappings.
87 * The following functions are provided for use by other kernel modules,
88 * specifically kernel LSM modules, to provide a consistent, transparent API
89 * for dealing with explicit packet labeling protocols such as CIPSO and
90 * RIPSO. The functions defined here are implemented in the
91 * net/netlabel/netlabel_kapi.c file.
95 /* NetLabel audit information */
101 /* Domain mapping definition struct */
102 struct netlbl_dom_map
;
104 /* Domain mapping operations */
105 int netlbl_domhsh_remove(const char *domain
, struct netlbl_audit
*audit_info
);
107 /* LSM security attributes */
108 struct netlbl_lsm_cache
{
109 void (*free
) (const void *data
);
112 struct netlbl_lsm_secattr
{
117 unsigned char *mls_cat
;
120 struct netlbl_lsm_cache cache
;
124 * LSM security attribute operations
129 * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct
130 * @secattr: the struct to initialize
133 * Initialize an already allocated netlbl_lsm_secattr struct. Returns zero on
134 * success, negative values on error.
137 static inline int netlbl_secattr_init(struct netlbl_lsm_secattr
*secattr
)
139 memset(secattr
, 0, sizeof(*secattr
));
144 * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct
145 * @secattr: the struct to clear
146 * @clear_cache: cache clear flag
149 * Destroys the @secattr struct, including freeing all of the internal buffers.
150 * If @clear_cache is true then free the cache fields, otherwise leave them
151 * intact. The struct must be reset with a call to netlbl_secattr_init()
155 static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr
*secattr
,
158 if (clear_cache
&& secattr
->cache
.data
!= NULL
&& secattr
->cache
.free
)
159 secattr
->cache
.free(secattr
->cache
.data
);
160 kfree(secattr
->domain
);
161 kfree(secattr
->mls_cat
);
165 * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct
166 * @flags: the memory allocation flags
169 * Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid
170 * pointer on success, or NULL on failure.
173 static inline struct netlbl_lsm_secattr
*netlbl_secattr_alloc(int flags
)
175 return kzalloc(sizeof(struct netlbl_lsm_secattr
), flags
);
179 * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct
180 * @secattr: the struct to free
181 * @clear_cache: cache clear flag
184 * Frees @secattr including all of the internal buffers. If @clear_cache is
185 * true then free the cache fields, otherwise leave them intact.
188 static inline void netlbl_secattr_free(struct netlbl_lsm_secattr
*secattr
,
191 netlbl_secattr_destroy(secattr
, clear_cache
);
196 * LSM protocol operations
199 #ifdef CONFIG_NETLABEL
200 int netlbl_socket_setattr(const struct socket
*sock
,
201 const struct netlbl_lsm_secattr
*secattr
);
202 int netlbl_sock_getattr(struct sock
*sk
,
203 struct netlbl_lsm_secattr
*secattr
);
204 int netlbl_socket_getattr(const struct socket
*sock
,
205 struct netlbl_lsm_secattr
*secattr
);
206 int netlbl_skbuff_getattr(const struct sk_buff
*skb
,
207 struct netlbl_lsm_secattr
*secattr
);
208 void netlbl_skbuff_err(struct sk_buff
*skb
, int error
);
210 static inline int netlbl_socket_setattr(const struct socket
*sock
,
211 const struct netlbl_lsm_secattr
*secattr
)
216 static inline int netlbl_sock_getattr(struct sock
*sk
,
217 struct netlbl_lsm_secattr
*secattr
)
222 static inline int netlbl_socket_getattr(const struct socket
*sock
,
223 struct netlbl_lsm_secattr
*secattr
)
228 static inline int netlbl_skbuff_getattr(const struct sk_buff
*skb
,
229 struct netlbl_lsm_secattr
*secattr
)
234 static inline void netlbl_skbuff_err(struct sk_buff
*skb
, int error
)
238 #endif /* CONFIG_NETLABEL */
241 * LSM label mapping cache operations
244 #ifdef CONFIG_NETLABEL
245 void netlbl_cache_invalidate(void);
246 int netlbl_cache_add(const struct sk_buff
*skb
,
247 const struct netlbl_lsm_secattr
*secattr
);
249 static inline void netlbl_cache_invalidate(void)
254 static inline int netlbl_cache_add(const struct sk_buff
*skb
,
255 const struct netlbl_lsm_secattr
*secattr
)
259 #endif /* CONFIG_NETLABEL */
261 #endif /* _NETLABEL_H */