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