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1/*
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 *
11 * Author: Paul Moore <paul.moore@hp.com>
12 *
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>
40#include <linux/net.h>
41#include <linux/skbuff.h>
42#include <net/netlabel.h>
43#include <asm/atomic.h>
44
45/* known doi values */
46#define CIPSO_V4_DOI_UNKNOWN 0x00000000
47
48/* standard tag types */
49#define CIPSO_V4_TAG_INVALID 0
50#define CIPSO_V4_TAG_RBITMAP 1
51#define CIPSO_V4_TAG_ENUM 2
52#define CIPSO_V4_TAG_RANGE 5
53#define CIPSO_V4_TAG_PBITMAP 6
54#define CIPSO_V4_TAG_FREEFORM 7
55
56/* non-standard tag types (tags > 127) */
57#define CIPSO_V4_TAG_LOCAL 128
58
59/* doi mapping types */
60#define CIPSO_V4_MAP_UNKNOWN 0
61#define CIPSO_V4_MAP_TRANS 1
62#define CIPSO_V4_MAP_PASS 2
63#define CIPSO_V4_MAP_LOCAL 3
64
65/* limits */
66#define CIPSO_V4_MAX_REM_LVLS 255
67#define CIPSO_V4_INV_LVL 0x80000000
68#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
69#define CIPSO_V4_MAX_REM_CATS 65534
70#define CIPSO_V4_INV_CAT 0x80000000
71#define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
72
73/*
74 * CIPSO DOI definitions
75 */
76
77/* DOI definition struct */
78#define CIPSO_V4_TAG_MAXCNT 5
79struct cipso_v4_doi {
80 u32 doi;
81 u32 type;
82 union {
83 struct cipso_v4_std_map_tbl *std;
84 } map;
85 u8 tags[CIPSO_V4_TAG_MAXCNT];
86
87 atomic_t refcount;
88 struct list_head list;
89 struct rcu_head rcu;
90};
91
92/* Standard CIPSO mapping table */
93/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
94 * bit is set then consider that value as unspecified, meaning the
95 * mapping for that particular level/category is invalid */
96struct cipso_v4_std_map_tbl {
97 struct {
98 u32 *cipso;
99 u32 *local;
100 u32 cipso_size;
101 u32 local_size;
102 } lvl;
103 struct {
104 u32 *cipso;
105 u32 *local;
106 u32 cipso_size;
107 u32 local_size;
108 } cat;
109};
110
111/*
112 * Sysctl Variables
113 */
114
115#ifdef CONFIG_NETLABEL
116extern int cipso_v4_cache_enabled;
117extern int cipso_v4_cache_bucketsize;
118extern int cipso_v4_rbm_optfmt;
119extern int cipso_v4_rbm_strictvalid;
120#endif
121
122/*
123 * Helper Functions
124 */
125
126#define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
127#define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
128
129/*
130 * DOI List Functions
131 */
132
133#ifdef CONFIG_NETLABEL
134int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
135 struct netlbl_audit *audit_info);
136void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
137int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
138struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
139void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
140int cipso_v4_doi_walk(u32 *skip_cnt,
141 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
142 void *cb_arg);
143#else
144static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
145 struct netlbl_audit *audit_info)
146{
147 return -ENOSYS;
148}
149
150static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
151{
152 return;
153}
154
155static inline int cipso_v4_doi_remove(u32 doi,
156 struct netlbl_audit *audit_info)
157{
158 return 0;
159}
160
161static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
162{
163 return NULL;
164}
165
166static inline int cipso_v4_doi_walk(u32 *skip_cnt,
167 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
168 void *cb_arg)
169{
170 return 0;
171}
172
173static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
174 const char *domain)
175{
176 return -ENOSYS;
177}
178
179static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
180 const char *domain)
181{
182 return 0;
183}
184#endif /* CONFIG_NETLABEL */
185
186/*
187 * Label Mapping Cache Functions
188 */
189
190#ifdef CONFIG_NETLABEL
191void cipso_v4_cache_invalidate(void);
192int cipso_v4_cache_add(const struct sk_buff *skb,
193 const struct netlbl_lsm_secattr *secattr);
194#else
195static inline void cipso_v4_cache_invalidate(void)
196{
197 return;
198}
199
200static inline int cipso_v4_cache_add(const struct sk_buff *skb,
201 const struct netlbl_lsm_secattr *secattr)
202{
203 return 0;
204}
205#endif /* CONFIG_NETLABEL */
206
207/*
208 * Protocol Handling Functions
209 */
210
211#ifdef CONFIG_NETLABEL
212void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
213int cipso_v4_sock_setattr(struct sock *sk,
214 const struct cipso_v4_doi *doi_def,
215 const struct netlbl_lsm_secattr *secattr);
216void cipso_v4_sock_delattr(struct sock *sk);
217int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
218int cipso_v4_skbuff_setattr(struct sk_buff *skb,
219 const struct cipso_v4_doi *doi_def,
220 const struct netlbl_lsm_secattr *secattr);
221int cipso_v4_skbuff_delattr(struct sk_buff *skb);
222int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
223 struct netlbl_lsm_secattr *secattr);
224int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
225#else
226static inline void cipso_v4_error(struct sk_buff *skb,
227 int error,
228 u32 gateway)
229{
230 return;
231}
232
233static inline int cipso_v4_sock_setattr(struct sock *sk,
234 const struct cipso_v4_doi *doi_def,
235 const struct netlbl_lsm_secattr *secattr)
236{
237 return -ENOSYS;
238}
239
240static inline void cipso_v4_sock_delattr(struct sock *sk)
241{
242}
243
244static inline int cipso_v4_sock_getattr(struct sock *sk,
245 struct netlbl_lsm_secattr *secattr)
246{
247 return -ENOSYS;
248}
249
250static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
251 const struct cipso_v4_doi *doi_def,
252 const struct netlbl_lsm_secattr *secattr)
253{
254 return -ENOSYS;
255}
256
257static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
258{
259 return -ENOSYS;
260}
261
262static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
263 struct netlbl_lsm_secattr *secattr)
264{
265 return -ENOSYS;
266}
267
268static inline int cipso_v4_validate(const struct sk_buff *skb,
269 unsigned char **option)
270{
271 return -ENOSYS;
272}
273#endif /* CONFIG_NETLABEL */
274
275#endif /* _CIPSO_IPV4_H */