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Linux kernel mirror (for testing)
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linux
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
38/*
39 * NetLabel - A management interface for maintaining network packet label
40 * mapping tables for explicit packet labling protocols.
41 *
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.
47 *
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:
51 *
52 * +-----------------+-------------------+--------- --- -- -
53 * | struct nlmsghdr | struct genlmsghdr | payload
54 * +-----------------+-------------------+--------- --- -- -
55 *
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.
62 *
63 */
64
65/*
66 * NetLabel NETLINK protocol
67 */
68
69#define NETLBL_PROTO_VERSION 1
70
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"
83
84/*
85 * NetLabel - Kernel API for accessing the network packet label mappings.
86 *
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.
92 *
93 */
94
95/* NetLabel audit information */
96struct netlbl_audit {
97 u32 secid;
98 uid_t loginuid;
99};
100
101/* Domain mapping definition struct */
102struct netlbl_dom_map;
103
104/* Domain mapping operations */
105int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info);
106
107/* LSM security attributes */
108struct netlbl_lsm_cache {
109 void (*free) (const void *data);
110 void *data;
111};
112struct netlbl_lsm_secattr {
113 char *domain;
114
115 u32 mls_lvl;
116 u32 mls_lvl_vld;
117 unsigned char *mls_cat;
118 size_t mls_cat_len;
119
120 struct netlbl_lsm_cache cache;
121};
122
123/*
124 * LSM security attribute operations
125 */
126
127
128/**
129 * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct
130 * @secattr: the struct to initialize
131 *
132 * Description:
133 * Initialize an already allocated netlbl_lsm_secattr struct. Returns zero on
134 * success, negative values on error.
135 *
136 */
137static inline int netlbl_secattr_init(struct netlbl_lsm_secattr *secattr)
138{
139 memset(secattr, 0, sizeof(*secattr));
140 return 0;
141}
142
143/**
144 * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct
145 * @secattr: the struct to clear
146 * @clear_cache: cache clear flag
147 *
148 * Description:
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()
152 * before reuse.
153 *
154 */
155static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr,
156 u32 clear_cache)
157{
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);
162}
163
164/**
165 * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct
166 * @flags: the memory allocation flags
167 *
168 * Description:
169 * Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid
170 * pointer on success, or NULL on failure.
171 *
172 */
173static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(int flags)
174{
175 return kzalloc(sizeof(struct netlbl_lsm_secattr), flags);
176}
177
178/**
179 * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct
180 * @secattr: the struct to free
181 * @clear_cache: cache clear flag
182 *
183 * Description:
184 * Frees @secattr including all of the internal buffers. If @clear_cache is
185 * true then free the cache fields, otherwise leave them intact.
186 *
187 */
188static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr,
189 u32 clear_cache)
190{
191 netlbl_secattr_destroy(secattr, clear_cache);
192 kfree(secattr);
193}
194
195/*
196 * LSM protocol operations
197 */
198
199#ifdef CONFIG_NETLABEL
200int netlbl_socket_setattr(const struct socket *sock,
201 const struct netlbl_lsm_secattr *secattr);
202int netlbl_sock_getattr(struct sock *sk,
203 struct netlbl_lsm_secattr *secattr);
204int netlbl_socket_getattr(const struct socket *sock,
205 struct netlbl_lsm_secattr *secattr);
206int netlbl_skbuff_getattr(const struct sk_buff *skb,
207 struct netlbl_lsm_secattr *secattr);
208void netlbl_skbuff_err(struct sk_buff *skb, int error);
209#else
210static inline int netlbl_socket_setattr(const struct socket *sock,
211 const struct netlbl_lsm_secattr *secattr)
212{
213 return -ENOSYS;
214}
215
216static inline int netlbl_sock_getattr(struct sock *sk,
217 struct netlbl_lsm_secattr *secattr)
218{
219 return -ENOSYS;
220}
221
222static inline int netlbl_socket_getattr(const struct socket *sock,
223 struct netlbl_lsm_secattr *secattr)
224{
225 return -ENOSYS;
226}
227
228static inline int netlbl_skbuff_getattr(const struct sk_buff *skb,
229 struct netlbl_lsm_secattr *secattr)
230{
231 return -ENOSYS;
232}
233
234static inline void netlbl_skbuff_err(struct sk_buff *skb, int error)
235{
236 return;
237}
238#endif /* CONFIG_NETLABEL */
239
240/*
241 * LSM label mapping cache operations
242 */
243
244#ifdef CONFIG_NETLABEL
245void netlbl_cache_invalidate(void);
246int netlbl_cache_add(const struct sk_buff *skb,
247 const struct netlbl_lsm_secattr *secattr);
248#else
249static inline void netlbl_cache_invalidate(void)
250{
251 return;
252}
253
254static inline int netlbl_cache_add(const struct sk_buff *skb,
255 const struct netlbl_lsm_secattr *secattr)
256{
257 return 0;
258}
259#endif /* CONFIG_NETLABEL */
260
261#endif /* _NETLABEL_H */