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11a03f78 PM |
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> | |
7a0e1d60 | 34 | #include <linux/net.h> |
11a03f78 PM |
35 | #include <linux/skbuff.h> |
36 | #include <net/netlink.h> | |
ffb733c6 | 37 | #include <asm/atomic.h> |
11a03f78 PM |
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 | |
fcd48280 PM |
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. | |
11a03f78 PM |
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 | ||
11a03f78 PM |
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 | ||
95d4e6be PM |
96 | /* NetLabel audit information */ |
97 | struct netlbl_audit { | |
98 | u32 secid; | |
99 | uid_t loginuid; | |
100 | }; | |
101 | ||
11a03f78 PM |
102 | /* Domain mapping definition struct */ |
103 | struct netlbl_dom_map; | |
104 | ||
105 | /* Domain mapping operations */ | |
95d4e6be | 106 | int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info); |
11a03f78 PM |
107 | |
108 | /* LSM security attributes */ | |
109 | struct netlbl_lsm_cache { | |
ffb733c6 | 110 | atomic_t refcount; |
11a03f78 PM |
111 | void (*free) (const void *data); |
112 | void *data; | |
113 | }; | |
114 | struct netlbl_lsm_secattr { | |
115 | char *domain; | |
116 | ||
117 | u32 mls_lvl; | |
118 | u32 mls_lvl_vld; | |
119 | unsigned char *mls_cat; | |
120 | size_t mls_cat_len; | |
121 | ||
ffb733c6 | 122 | struct netlbl_lsm_cache *cache; |
11a03f78 PM |
123 | }; |
124 | ||
125 | /* | |
126 | * LSM security attribute operations | |
127 | */ | |
128 | ||
129 | ||
ffb733c6 | 130 | /** |
131 | * netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache | |
132 | * @flags: the memory allocation flags | |
133 | * | |
134 | * Description: | |
135 | * Allocate and initialize a netlbl_lsm_cache structure. Returns a pointer | |
136 | * on success, NULL on failure. | |
137 | * | |
138 | */ | |
645408d1 | 139 | static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags) |
ffb733c6 | 140 | { |
141 | struct netlbl_lsm_cache *cache; | |
142 | ||
143 | cache = kzalloc(sizeof(*cache), flags); | |
144 | if (cache) | |
145 | atomic_set(&cache->refcount, 1); | |
146 | return cache; | |
147 | } | |
148 | ||
149 | /** | |
150 | * netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct | |
151 | * @cache: the struct to free | |
152 | * | |
153 | * Description: | |
154 | * Frees @secattr including all of the internal buffers. | |
155 | * | |
156 | */ | |
157 | static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache) | |
158 | { | |
159 | if (!atomic_dec_and_test(&cache->refcount)) | |
160 | return; | |
161 | ||
162 | if (cache->free) | |
163 | cache->free(cache->data); | |
164 | kfree(cache); | |
165 | } | |
166 | ||
11a03f78 PM |
167 | /** |
168 | * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct | |
169 | * @secattr: the struct to initialize | |
170 | * | |
171 | * Description: | |
172 | * Initialize an already allocated netlbl_lsm_secattr struct. Returns zero on | |
173 | * success, negative values on error. | |
174 | * | |
175 | */ | |
176 | static inline int netlbl_secattr_init(struct netlbl_lsm_secattr *secattr) | |
177 | { | |
178 | memset(secattr, 0, sizeof(*secattr)); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | /** | |
183 | * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct | |
184 | * @secattr: the struct to clear | |
11a03f78 PM |
185 | * |
186 | * Description: | |
187 | * Destroys the @secattr struct, including freeing all of the internal buffers. | |
ffb733c6 | 188 | * The struct must be reset with a call to netlbl_secattr_init() before reuse. |
11a03f78 PM |
189 | * |
190 | */ | |
ffb733c6 | 191 | static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr) |
11a03f78 | 192 | { |
ffb733c6 | 193 | if (secattr->cache) |
194 | netlbl_secattr_cache_free(secattr->cache); | |
11a03f78 PM |
195 | kfree(secattr->domain); |
196 | kfree(secattr->mls_cat); | |
197 | } | |
198 | ||
199 | /** | |
200 | * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct | |
201 | * @flags: the memory allocation flags | |
202 | * | |
203 | * Description: | |
204 | * Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid | |
205 | * pointer on success, or NULL on failure. | |
206 | * | |
207 | */ | |
1f758d93 | 208 | static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags) |
11a03f78 PM |
209 | { |
210 | return kzalloc(sizeof(struct netlbl_lsm_secattr), flags); | |
211 | } | |
212 | ||
213 | /** | |
214 | * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct | |
215 | * @secattr: the struct to free | |
11a03f78 PM |
216 | * |
217 | * Description: | |
ffb733c6 | 218 | * Frees @secattr including all of the internal buffers. |
11a03f78 PM |
219 | * |
220 | */ | |
ffb733c6 | 221 | static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr) |
11a03f78 | 222 | { |
ffb733c6 | 223 | netlbl_secattr_destroy(secattr); |
11a03f78 PM |
224 | kfree(secattr); |
225 | } | |
226 | ||
227 | /* | |
228 | * LSM protocol operations | |
229 | */ | |
230 | ||
231 | #ifdef CONFIG_NETLABEL | |
232 | int netlbl_socket_setattr(const struct socket *sock, | |
233 | const struct netlbl_lsm_secattr *secattr); | |
14a72f53 PM |
234 | int netlbl_sock_getattr(struct sock *sk, |
235 | struct netlbl_lsm_secattr *secattr); | |
11a03f78 PM |
236 | int netlbl_socket_getattr(const struct socket *sock, |
237 | struct netlbl_lsm_secattr *secattr); | |
238 | int netlbl_skbuff_getattr(const struct sk_buff *skb, | |
239 | struct netlbl_lsm_secattr *secattr); | |
240 | void netlbl_skbuff_err(struct sk_buff *skb, int error); | |
241 | #else | |
242 | static inline int netlbl_socket_setattr(const struct socket *sock, | |
243 | const struct netlbl_lsm_secattr *secattr) | |
244 | { | |
245 | return -ENOSYS; | |
246 | } | |
247 | ||
14a72f53 PM |
248 | static inline int netlbl_sock_getattr(struct sock *sk, |
249 | struct netlbl_lsm_secattr *secattr) | |
250 | { | |
251 | return -ENOSYS; | |
252 | } | |
253 | ||
11a03f78 PM |
254 | static inline int netlbl_socket_getattr(const struct socket *sock, |
255 | struct netlbl_lsm_secattr *secattr) | |
256 | { | |
257 | return -ENOSYS; | |
258 | } | |
259 | ||
260 | static inline int netlbl_skbuff_getattr(const struct sk_buff *skb, | |
261 | struct netlbl_lsm_secattr *secattr) | |
262 | { | |
263 | return -ENOSYS; | |
264 | } | |
265 | ||
266 | static inline void netlbl_skbuff_err(struct sk_buff *skb, int error) | |
267 | { | |
268 | return; | |
269 | } | |
270 | #endif /* CONFIG_NETLABEL */ | |
271 | ||
272 | /* | |
273 | * LSM label mapping cache operations | |
274 | */ | |
275 | ||
276 | #ifdef CONFIG_NETLABEL | |
277 | void netlbl_cache_invalidate(void); | |
278 | int netlbl_cache_add(const struct sk_buff *skb, | |
279 | const struct netlbl_lsm_secattr *secattr); | |
280 | #else | |
281 | static inline void netlbl_cache_invalidate(void) | |
282 | { | |
283 | return; | |
284 | } | |
285 | ||
286 | static inline int netlbl_cache_add(const struct sk_buff *skb, | |
287 | const struct netlbl_lsm_secattr *secattr) | |
288 | { | |
289 | return 0; | |
290 | } | |
291 | #endif /* CONFIG_NETLABEL */ | |
292 | ||
293 | #endif /* _NETLABEL_H */ |