2 * CIPSO - Commercial IP Security Option
4 * This is an implementation of the CIPSO 2.2 protocol as specified in
5 * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
6 * FIPS-188, copies of both documents can be found in the Documentation
7 * directory. While CIPSO never became a full IETF RFC standard many vendors
8 * have chosen to adopt the protocol and over the years it has become a
9 * de-facto standard for labeled networking.
11 * Author: Paul Moore <paul@paul-moore.com>
16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2 of the License, or
21 * (at your option) any later version.
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
26 * the GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
37 #include <linux/types.h>
38 #include <linux/rcupdate.h>
39 #include <linux/list.h>
40 #include <linux/net.h>
41 #include <linux/skbuff.h>
42 #include <net/netlabel.h>
43 #include <net/request_sock.h>
44 #include <linux/atomic.h>
45 #include <asm/unaligned.h>
47 /* known doi values */
48 #define CIPSO_V4_DOI_UNKNOWN 0x00000000
50 /* standard tag types */
51 #define CIPSO_V4_TAG_INVALID 0
52 #define CIPSO_V4_TAG_RBITMAP 1
53 #define CIPSO_V4_TAG_ENUM 2
54 #define CIPSO_V4_TAG_RANGE 5
55 #define CIPSO_V4_TAG_PBITMAP 6
56 #define CIPSO_V4_TAG_FREEFORM 7
58 /* non-standard tag types (tags > 127) */
59 #define CIPSO_V4_TAG_LOCAL 128
61 /* doi mapping types */
62 #define CIPSO_V4_MAP_UNKNOWN 0
63 #define CIPSO_V4_MAP_TRANS 1
64 #define CIPSO_V4_MAP_PASS 2
65 #define CIPSO_V4_MAP_LOCAL 3
68 #define CIPSO_V4_MAX_REM_LVLS 255
69 #define CIPSO_V4_INV_LVL 0x80000000
70 #define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
71 #define CIPSO_V4_MAX_REM_CATS 65534
72 #define CIPSO_V4_INV_CAT 0x80000000
73 #define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
76 * CIPSO DOI definitions
79 /* DOI definition struct */
80 #define CIPSO_V4_TAG_MAXCNT 5
85 struct cipso_v4_std_map_tbl *std;
87 u8 tags[CIPSO_V4_TAG_MAXCNT];
90 struct list_head list;
94 /* Standard CIPSO mapping table */
95 /* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
96 * bit is set then consider that value as unspecified, meaning the
97 * mapping for that particular level/category is invalid */
98 struct cipso_v4_std_map_tbl {
117 #ifdef CONFIG_NETLABEL
118 extern int cipso_v4_cache_enabled;
119 extern int cipso_v4_cache_bucketsize;
120 extern int cipso_v4_rbm_optfmt;
121 extern int cipso_v4_rbm_strictvalid;
128 #define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
129 #define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
135 #ifdef CONFIG_NETLABEL
136 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
137 struct netlbl_audit *audit_info);
138 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
139 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
140 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
141 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
142 int cipso_v4_doi_walk(u32 *skip_cnt,
143 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
146 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
147 struct netlbl_audit *audit_info)
152 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
157 static inline int cipso_v4_doi_remove(u32 doi,
158 struct netlbl_audit *audit_info)
163 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
168 static inline int cipso_v4_doi_walk(u32 *skip_cnt,
169 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
175 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
181 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
186 #endif /* CONFIG_NETLABEL */
189 * Label Mapping Cache Functions
192 #ifdef CONFIG_NETLABEL
193 void cipso_v4_cache_invalidate(void);
194 int cipso_v4_cache_add(const struct sk_buff *skb,
195 const struct netlbl_lsm_secattr *secattr);
197 static inline void cipso_v4_cache_invalidate(void)
202 static inline int cipso_v4_cache_add(const struct sk_buff *skb,
203 const struct netlbl_lsm_secattr *secattr)
207 #endif /* CONFIG_NETLABEL */
210 * Protocol Handling Functions
213 #ifdef CONFIG_NETLABEL
214 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
215 int cipso_v4_sock_setattr(struct sock *sk,
216 const struct cipso_v4_doi *doi_def,
217 const struct netlbl_lsm_secattr *secattr);
218 void cipso_v4_sock_delattr(struct sock *sk);
219 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
220 int cipso_v4_req_setattr(struct request_sock *req,
221 const struct cipso_v4_doi *doi_def,
222 const struct netlbl_lsm_secattr *secattr);
223 void cipso_v4_req_delattr(struct request_sock *req);
224 int cipso_v4_skbuff_setattr(struct sk_buff *skb,
225 const struct cipso_v4_doi *doi_def,
226 const struct netlbl_lsm_secattr *secattr);
227 int cipso_v4_skbuff_delattr(struct sk_buff *skb);
228 int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
229 struct netlbl_lsm_secattr *secattr);
230 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
232 static inline void cipso_v4_error(struct sk_buff *skb,
239 static inline int cipso_v4_sock_setattr(struct sock *sk,
240 const struct cipso_v4_doi *doi_def,
241 const struct netlbl_lsm_secattr *secattr)
246 static inline void cipso_v4_sock_delattr(struct sock *sk)
250 static inline int cipso_v4_sock_getattr(struct sock *sk,
251 struct netlbl_lsm_secattr *secattr)
256 static inline int cipso_v4_req_setattr(struct request_sock *req,
257 const struct cipso_v4_doi *doi_def,
258 const struct netlbl_lsm_secattr *secattr)
263 static inline void cipso_v4_req_delattr(struct request_sock *req)
268 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
269 const struct cipso_v4_doi *doi_def,
270 const struct netlbl_lsm_secattr *secattr)
275 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
280 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
281 struct netlbl_lsm_secattr *secattr)
286 static inline int cipso_v4_validate(const struct sk_buff *skb,
287 unsigned char **option)
289 unsigned char *opt = *option;
290 unsigned char err_offset = 0;
299 if (get_unaligned_be32(&opt[2]) == 0) {
304 for (opt_iter = 6; opt_iter < opt_len;) {
305 if (opt[opt_iter + 1] > (opt_len - opt_iter)) {
306 err_offset = opt_iter + 1;
309 opt_iter += opt[opt_iter + 1];
313 *option = opt + err_offset;
317 #endif /* CONFIG_NETLABEL */
319 #endif /* _CIPSO_IPV4_H */