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Paul Moore11a03f72006-08-03 16:46:20 -07001/*
2 * CIPSO - Commercial IP Security Option
3 *
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.
10 *
Paul Moore82c21bf2011-08-01 11:10:33 +000011 * Author: Paul Moore <paul@paul-moore.com>
Paul Moore11a03f72006-08-03 16:46:20 -070012 *
13 */
14
15/*
16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
17 *
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.
22 *
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.
27 *
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
31 *
32 */
33
34#ifndef _CIPSO_IPV4_H
35#define _CIPSO_IPV4_H
36
37#include <linux/types.h>
38#include <linux/rcupdate.h>
39#include <linux/list.h>
Paul Moore7a0e1d62006-08-29 17:56:04 -070040#include <linux/net.h>
41#include <linux/skbuff.h>
Paul Moore11a03f72006-08-03 16:46:20 -070042#include <net/netlabel.h>
Paul Moore389fb8002009-03-27 17:10:34 -040043#include <net/request_sock.h>
Arun Sharma600634972011-07-26 16:09:06 -070044#include <linux/atomic.h>
Paul Moore20e2a862012-06-01 05:54:56 +000045#include <asm/unaligned.h>
Paul Moore11a03f72006-08-03 16:46:20 -070046
47/* known doi values */
48#define CIPSO_V4_DOI_UNKNOWN 0x00000000
49
Paul Moore15c45f72008-10-10 10:16:34 -040050/* standard tag types */
Paul Moore11a03f72006-08-03 16:46:20 -070051#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
57
Paul Moore15c45f72008-10-10 10:16:34 -040058/* non-standard tag types (tags > 127) */
59#define CIPSO_V4_TAG_LOCAL 128
60
Paul Moore11a03f72006-08-03 16:46:20 -070061/* doi mapping types */
62#define CIPSO_V4_MAP_UNKNOWN 0
Paul Moore15c45f72008-10-10 10:16:34 -040063#define CIPSO_V4_MAP_TRANS 1
Paul Moore11a03f72006-08-03 16:46:20 -070064#define CIPSO_V4_MAP_PASS 2
Paul Moore15c45f72008-10-10 10:16:34 -040065#define CIPSO_V4_MAP_LOCAL 3
Paul Moore11a03f72006-08-03 16:46:20 -070066
67/* limits */
Paul Moorec6b16772006-11-17 17:38:51 -050068#define CIPSO_V4_MAX_REM_LVLS 255
Paul Moore11a03f72006-08-03 16:46:20 -070069#define CIPSO_V4_INV_LVL 0x80000000
70#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
Paul Moorec6b16772006-11-17 17:38:51 -050071#define CIPSO_V4_MAX_REM_CATS 65534
Paul Moore11a03f72006-08-03 16:46:20 -070072#define CIPSO_V4_INV_CAT 0x80000000
73#define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
74
75/*
76 * CIPSO DOI definitions
77 */
78
79/* DOI definition struct */
80#define CIPSO_V4_TAG_MAXCNT 5
81struct cipso_v4_doi {
82 u32 doi;
83 u32 type;
84 union {
85 struct cipso_v4_std_map_tbl *std;
86 } map;
87 u8 tags[CIPSO_V4_TAG_MAXCNT];
88
Paul Mooreb1edeb12008-10-10 10:16:31 -040089 atomic_t refcount;
Paul Moore11a03f72006-08-03 16:46:20 -070090 struct list_head list;
91 struct rcu_head rcu;
Paul Moore11a03f72006-08-03 16:46:20 -070092};
93
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 */
98struct cipso_v4_std_map_tbl {
99 struct {
100 u32 *cipso;
101 u32 *local;
102 u32 cipso_size;
103 u32 local_size;
104 } lvl;
105 struct {
106 u32 *cipso;
107 u32 *local;
108 u32 cipso_size;
109 u32 local_size;
110 } cat;
111};
112
113/*
114 * Sysctl Variables
115 */
116
117#ifdef CONFIG_NETLABEL
118extern int cipso_v4_cache_enabled;
119extern int cipso_v4_cache_bucketsize;
120extern int cipso_v4_rbm_optfmt;
121extern int cipso_v4_rbm_strictvalid;
122#endif
123
124/*
125 * Helper Functions
126 */
127
128#define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700129#define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
Paul Moore11a03f72006-08-03 16:46:20 -0700130
131/*
132 * DOI List Functions
133 */
134
135#ifdef CONFIG_NETLABEL
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500136int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
137 struct netlbl_audit *audit_info);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400138void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
139int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
Paul Moore11a03f72006-08-03 16:46:20 -0700140struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400141void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
Paul Moorefcd48282006-09-25 15:56:09 -0700142int cipso_v4_doi_walk(u32 *skip_cnt,
143 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
144 void *cb_arg);
Paul Moore11a03f72006-08-03 16:46:20 -0700145#else
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500146static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
147 struct netlbl_audit *audit_info)
Paul Moore11a03f72006-08-03 16:46:20 -0700148{
149 return -ENOSYS;
150}
151
Paul Mooreb1edeb12008-10-10 10:16:31 -0400152static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
153{
154 return;
155}
156
Paul Moore11a03f72006-08-03 16:46:20 -0700157static inline int cipso_v4_doi_remove(u32 doi,
Paul Mooreb1edeb12008-10-10 10:16:31 -0400158 struct netlbl_audit *audit_info)
Paul Moore11a03f72006-08-03 16:46:20 -0700159{
160 return 0;
161}
162
163static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
164{
165 return NULL;
166}
167
Paul Moorefcd48282006-09-25 15:56:09 -0700168static inline int cipso_v4_doi_walk(u32 *skip_cnt,
169 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
170 void *cb_arg)
Paul Moore11a03f72006-08-03 16:46:20 -0700171{
Paul Moorefcd48282006-09-25 15:56:09 -0700172 return 0;
Paul Moore11a03f72006-08-03 16:46:20 -0700173}
174
175static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
176 const char *domain)
177{
178 return -ENOSYS;
179}
180
181static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
182 const char *domain)
183{
184 return 0;
185}
186#endif /* CONFIG_NETLABEL */
187
188/*
189 * Label Mapping Cache Functions
190 */
191
192#ifdef CONFIG_NETLABEL
193void cipso_v4_cache_invalidate(void);
194int cipso_v4_cache_add(const struct sk_buff *skb,
195 const struct netlbl_lsm_secattr *secattr);
196#else
197static inline void cipso_v4_cache_invalidate(void)
198{
199 return;
200}
201
202static inline int cipso_v4_cache_add(const struct sk_buff *skb,
203 const struct netlbl_lsm_secattr *secattr)
204{
205 return 0;
206}
207#endif /* CONFIG_NETLABEL */
208
209/*
210 * Protocol Handling Functions
211 */
212
213#ifdef CONFIG_NETLABEL
214void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700215int cipso_v4_sock_setattr(struct sock *sk,
216 const struct cipso_v4_doi *doi_def,
217 const struct netlbl_lsm_secattr *secattr);
Paul Moore014ab192008-10-10 10:16:33 -0400218void cipso_v4_sock_delattr(struct sock *sk);
Paul Moore14a72f52006-09-25 15:52:01 -0700219int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
Paul Moore389fb8002009-03-27 17:10:34 -0400220int cipso_v4_req_setattr(struct request_sock *req,
221 const struct cipso_v4_doi *doi_def,
222 const struct netlbl_lsm_secattr *secattr);
223void cipso_v4_req_delattr(struct request_sock *req);
Paul Moore948bf852008-10-10 10:16:32 -0400224int cipso_v4_skbuff_setattr(struct sk_buff *skb,
225 const struct cipso_v4_doi *doi_def,
226 const struct netlbl_lsm_secattr *secattr);
227int cipso_v4_skbuff_delattr(struct sk_buff *skb);
Paul Moore11a03f72006-08-03 16:46:20 -0700228int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
229 struct netlbl_lsm_secattr *secattr);
Paul Moore15c45f72008-10-10 10:16:34 -0400230int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
Paul Moore11a03f72006-08-03 16:46:20 -0700231#else
232static inline void cipso_v4_error(struct sk_buff *skb,
233 int error,
234 u32 gateway)
235{
236 return;
237}
238
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700239static inline int cipso_v4_sock_setattr(struct sock *sk,
240 const struct cipso_v4_doi *doi_def,
241 const struct netlbl_lsm_secattr *secattr)
Paul Moore11a03f72006-08-03 16:46:20 -0700242{
243 return -ENOSYS;
244}
245
Paul Moore014ab192008-10-10 10:16:33 -0400246static inline void cipso_v4_sock_delattr(struct sock *sk)
247{
248}
249
Paul Moore14a72f52006-09-25 15:52:01 -0700250static inline int cipso_v4_sock_getattr(struct sock *sk,
251 struct netlbl_lsm_secattr *secattr)
252{
253 return -ENOSYS;
254}
255
Paul Moore389fb8002009-03-27 17:10:34 -0400256static 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)
259{
260 return -ENOSYS;
261}
262
263static inline void cipso_v4_req_delattr(struct request_sock *req)
264{
265 return;
266}
267
Paul Moore948bf852008-10-10 10:16:32 -0400268static 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)
271{
272 return -ENOSYS;
273}
274
275static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
276{
277 return -ENOSYS;
278}
279
Paul Moore11a03f72006-08-03 16:46:20 -0700280static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
281 struct netlbl_lsm_secattr *secattr)
282{
283 return -ENOSYS;
284}
285
Paul Moore15c45f72008-10-10 10:16:34 -0400286static inline int cipso_v4_validate(const struct sk_buff *skb,
287 unsigned char **option)
Paul Moore11a03f72006-08-03 16:46:20 -0700288{
Paul Moore20e2a862012-06-01 05:54:56 +0000289 unsigned char *opt = *option;
290 unsigned char err_offset = 0;
291 u8 opt_len = opt[1];
292 u8 opt_iter;
293
294 if (opt_len < 8) {
295 err_offset = 1;
296 goto out;
297 }
298
299 if (get_unaligned_be32(&opt[2]) == 0) {
300 err_offset = 2;
301 goto out;
302 }
303
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;
307 goto out;
308 }
309 opt_iter += opt[opt_iter + 1];
310 }
311
312out:
313 *option = opt + err_offset;
314 return err_offset;
315
Paul Moore11a03f72006-08-03 16:46:20 -0700316}
317#endif /* CONFIG_NETLABEL */
318
319#endif /* _CIPSO_IPV4_H */