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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 | }; | |
701a90ba PM |
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 | |
11a03f78 | 119 | struct netlbl_lsm_secattr { |
701a90ba PM |
120 | u32 flags; |
121 | ||
11a03f78 PM |
122 | char *domain; |
123 | ||
124 | u32 mls_lvl; | |
11a03f78 PM |
125 | unsigned char *mls_cat; |
126 | size_t mls_cat_len; | |
127 | ||
ffb733c6 | 128 | struct netlbl_lsm_cache *cache; |
11a03f78 PM |
129 | }; |
130 | ||
131 | /* | |
132 | * LSM security attribute operations | |
133 | */ | |
134 | ||
135 | ||
ffb733c6 | 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 | */ | |
645408d1 | 145 | static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags) |
ffb733c6 | 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 | ||
11a03f78 PM |
173 | /** |
174 | * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct | |
175 | * @secattr: the struct to initialize | |
176 | * | |
177 | * Description: | |
c6fa82a9 | 178 | * Initialize an already allocated netlbl_lsm_secattr struct. |
11a03f78 PM |
179 | * |
180 | */ | |
c6fa82a9 | 181 | static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr) |
11a03f78 | 182 | { |
701a90ba PM |
183 | secattr->flags = 0; |
184 | secattr->domain = NULL; | |
185 | secattr->mls_cat = NULL; | |
186 | secattr->cache = NULL; | |
11a03f78 PM |
187 | } |
188 | ||
189 | /** | |
190 | * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct | |
191 | * @secattr: the struct to clear | |
11a03f78 PM |
192 | * |
193 | * Description: | |
194 | * Destroys the @secattr struct, including freeing all of the internal buffers. | |
ffb733c6 | 195 | * The struct must be reset with a call to netlbl_secattr_init() before reuse. |
11a03f78 PM |
196 | * |
197 | */ | |
ffb733c6 | 198 | static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr) |
11a03f78 | 199 | { |
ffb733c6 | 200 | if (secattr->cache) |
201 | netlbl_secattr_cache_free(secattr->cache); | |
11a03f78 PM |
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 | */ | |
1f758d93 | 215 | static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags) |
11a03f78 PM |
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 | |
11a03f78 PM |
223 | * |
224 | * Description: | |
ffb733c6 | 225 | * Frees @secattr including all of the internal buffers. |
11a03f78 PM |
226 | * |
227 | */ | |
ffb733c6 | 228 | static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr) |
11a03f78 | 229 | { |
ffb733c6 | 230 | netlbl_secattr_destroy(secattr); |
11a03f78 PM |
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); | |
14a72f53 PM |
241 | int netlbl_sock_getattr(struct sock *sk, |
242 | struct netlbl_lsm_secattr *secattr); | |
11a03f78 PM |
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 | ||
14a72f53 PM |
255 | static inline int netlbl_sock_getattr(struct sock *sk, |
256 | struct netlbl_lsm_secattr *secattr) | |
257 | { | |
258 | return -ENOSYS; | |
259 | } | |
260 | ||
11a03f78 PM |
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 */ |