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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> | |
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 | |
fcd48280 PM |
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. | |
11a03f78 PM |
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 | ||
11a03f78 PM |
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 | ||
95d4e6be PM |
95 | /* NetLabel audit information */ |
96 | struct netlbl_audit { | |
97 | u32 secid; | |
98 | uid_t loginuid; | |
99 | }; | |
100 | ||
11a03f78 PM |
101 | /* Domain mapping definition struct */ |
102 | struct netlbl_dom_map; | |
103 | ||
104 | /* Domain mapping operations */ | |
95d4e6be | 105 | int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info); |
11a03f78 PM |
106 | |
107 | /* LSM security attributes */ | |
108 | struct netlbl_lsm_cache { | |
109 | void (*free) (const void *data); | |
110 | void *data; | |
111 | }; | |
112 | struct 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 | */ | |
137 | static 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 | */ | |
155 | static 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 | */ | |
173 | static 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 | */ | |
188 | static 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 | |
200 | int netlbl_socket_setattr(const struct socket *sock, | |
201 | const struct netlbl_lsm_secattr *secattr); | |
14a72f53 PM |
202 | int netlbl_sock_getattr(struct sock *sk, |
203 | struct netlbl_lsm_secattr *secattr); | |
11a03f78 PM |
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); | |
209 | #else | |
210 | static inline int netlbl_socket_setattr(const struct socket *sock, | |
211 | const struct netlbl_lsm_secattr *secattr) | |
212 | { | |
213 | return -ENOSYS; | |
214 | } | |
215 | ||
14a72f53 PM |
216 | static inline int netlbl_sock_getattr(struct sock *sk, |
217 | struct netlbl_lsm_secattr *secattr) | |
218 | { | |
219 | return -ENOSYS; | |
220 | } | |
221 | ||
11a03f78 PM |
222 | static inline int netlbl_socket_getattr(const struct socket *sock, |
223 | struct netlbl_lsm_secattr *secattr) | |
224 | { | |
225 | return -ENOSYS; | |
226 | } | |
227 | ||
228 | static inline int netlbl_skbuff_getattr(const struct sk_buff *skb, | |
229 | struct netlbl_lsm_secattr *secattr) | |
230 | { | |
231 | return -ENOSYS; | |
232 | } | |
233 | ||
234 | static 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 | |
245 | void netlbl_cache_invalidate(void); | |
246 | int netlbl_cache_add(const struct sk_buff *skb, | |
247 | const struct netlbl_lsm_secattr *secattr); | |
248 | #else | |
249 | static inline void netlbl_cache_invalidate(void) | |
250 | { | |
251 | return; | |
252 | } | |
253 | ||
254 | static 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 */ |