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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
44/* known doi values */
45#define CIPSO_V4_DOI_UNKNOWN 0x00000000
46
47/* tag types */
48#define CIPSO_V4_TAG_INVALID 0
49#define CIPSO_V4_TAG_RBITMAP 1
50#define CIPSO_V4_TAG_ENUM 2
51#define CIPSO_V4_TAG_RANGE 5
52#define CIPSO_V4_TAG_PBITMAP 6
53#define CIPSO_V4_TAG_FREEFORM 7
54
55/* doi mapping types */
56#define CIPSO_V4_MAP_UNKNOWN 0
57#define CIPSO_V4_MAP_STD 1
58#define CIPSO_V4_MAP_PASS 2
59
60/* limits */
61#define CIPSO_V4_MAX_REM_LVLS 255
62#define CIPSO_V4_INV_LVL 0x80000000
63#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
64#define CIPSO_V4_MAX_REM_CATS 65534
65#define CIPSO_V4_INV_CAT 0x80000000
66#define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
67
68/*
69 * CIPSO DOI definitions
70 */
71
72/* DOI definition struct */
73#define CIPSO_V4_TAG_MAXCNT 5
74struct cipso_v4_doi {
75 u32 doi;
76 u32 type;
77 union {
78 struct cipso_v4_std_map_tbl *std;
79 } map;
80 u8 tags[CIPSO_V4_TAG_MAXCNT];
81
82 u32 valid;
83 struct list_head list;
84 struct rcu_head rcu;
85 struct list_head dom_list;
86};
87
88/* Standard CIPSO mapping table */
89/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
90 * bit is set then consider that value as unspecified, meaning the
91 * mapping for that particular level/category is invalid */
92struct cipso_v4_std_map_tbl {
93 struct {
94 u32 *cipso;
95 u32 *local;
96 u32 cipso_size;
97 u32 local_size;
98 } lvl;
99 struct {
100 u32 *cipso;
101 u32 *local;
102 u32 cipso_size;
103 u32 local_size;
104 } cat;
105};
106
107/*
108 * Sysctl Variables
109 */
110
111#ifdef CONFIG_NETLABEL
112extern int cipso_v4_cache_enabled;
113extern int cipso_v4_cache_bucketsize;
114extern int cipso_v4_rbm_optfmt;
115extern int cipso_v4_rbm_strictvalid;
116#endif
117
118/*
119 * Helper Functions
120 */
121
122#define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
123#define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
124
125/*
126 * DOI List Functions
127 */
128
129#ifdef CONFIG_NETLABEL
130int cipso_v4_doi_add(struct cipso_v4_doi *doi_def);
131int cipso_v4_doi_remove(u32 doi,
132 struct netlbl_audit *audit_info,
133 void (*callback) (struct rcu_head * head));
134struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
135int cipso_v4_doi_walk(u32 *skip_cnt,
136 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
137 void *cb_arg);
138int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, const char *domain);
139int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
140 const char *domain);
141#else
142static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def)
143{
144 return -ENOSYS;
145}
146
147static inline int cipso_v4_doi_remove(u32 doi,
148 struct netlbl_audit *audit_info,
149 void (*callback) (struct rcu_head * head))
150{
151 return 0;
152}
153
154static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
155{
156 return NULL;
157}
158
159static inline int cipso_v4_doi_walk(u32 *skip_cnt,
160 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
161 void *cb_arg)
162{
163 return 0;
164}
165
166static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
167 const char *domain)
168{
169 return -ENOSYS;
170}
171
172static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
173 const char *domain)
174{
175 return 0;
176}
177#endif /* CONFIG_NETLABEL */
178
179/*
180 * Label Mapping Cache Functions
181 */
182
183#ifdef CONFIG_NETLABEL
184void cipso_v4_cache_invalidate(void);
185int cipso_v4_cache_add(const struct sk_buff *skb,
186 const struct netlbl_lsm_secattr *secattr);
187#else
188static inline void cipso_v4_cache_invalidate(void)
189{
190 return;
191}
192
193static inline int cipso_v4_cache_add(const struct sk_buff *skb,
194 const struct netlbl_lsm_secattr *secattr)
195{
196 return 0;
197}
198#endif /* CONFIG_NETLABEL */
199
200/*
201 * Protocol Handling Functions
202 */
203
204#ifdef CONFIG_NETLABEL
205void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
206int cipso_v4_sock_setattr(struct sock *sk,
207 const struct cipso_v4_doi *doi_def,
208 const struct netlbl_lsm_secattr *secattr);
209int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
210int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
211 struct netlbl_lsm_secattr *secattr);
212int cipso_v4_validate(unsigned char **option);
213#else
214static inline void cipso_v4_error(struct sk_buff *skb,
215 int error,
216 u32 gateway)
217{
218 return;
219}
220
221static inline int cipso_v4_sock_setattr(struct sock *sk,
222 const struct cipso_v4_doi *doi_def,
223 const struct netlbl_lsm_secattr *secattr)
224{
225 return -ENOSYS;
226}
227
228static inline int cipso_v4_sock_getattr(struct sock *sk,
229 struct netlbl_lsm_secattr *secattr)
230{
231 return -ENOSYS;
232}
233
234static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
235 struct netlbl_lsm_secattr *secattr)
236{
237 return -ENOSYS;
238}
239
240static inline int cipso_v4_validate(unsigned char **option)
241{
242 return -ENOSYS;
243}
244#endif /* CONFIG_NETLABEL */
245
246#endif /* _CIPSO_IPV4_H */