1 /*
2 * NetLabel Network Address Lists
3 *
4 * This file contains network address list functions used to manage ordered
5 * lists of network addresses for use by the NetLabel subsystem. The NetLabel
6 * system manages static and dynamic label mappings for network protocols such
7 * as CIPSO and RIPSO.
8 *
9 * Author: Paul Moore <paul.moore@hp.com>
10 *
11 */
12
13 /*
14 * (c) Copyright Hewlett-Packard Development Company, L.P., 2008
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
24 * the GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 */
31
32 #ifndef _NETLABEL_ADDRLIST_H
33 #define _NETLABEL_ADDRLIST_H
34
35 #include <linux/types.h>
36 #include <linux/rcupdate.h>
37 #include <linux/list.h>
38 #include <linux/in6.h>
39 #include <linux/audit.h>
40
41 /**
42 * struct netlbl_af4list - NetLabel IPv4 address list
43 * @addr: IPv4 address
44 * @mask: IPv4 address mask
45 * @valid: valid flag
46 * @list: list structure, used internally
47 */
48 struct netlbl_af4list {
49 __be32 addr;
50 __be32 mask;
51
52 u32 valid;
53 struct list_head list;
54 };
55
56 /**
57 * struct netlbl_af6list - NetLabel IPv6 address list
58 * @addr: IPv6 address
59 * @mask: IPv6 address mask
60 * @valid: valid flag
61 * @list: list structure, used internally
62 */
63 struct netlbl_af6list {
64 struct in6_addr addr;
65 struct in6_addr mask;
66
67 u32 valid;
68 struct list_head list;
69 };
70
71 #define __af4list_entry(ptr) container_of(ptr, struct netlbl_af4list, list)
72
__af4list_valid(struct list_head * s,struct list_head * h)73 static inline struct netlbl_af4list *__af4list_valid(struct list_head *s,
74 struct list_head *h)
75 {
76 struct list_head *i = s;
77 struct netlbl_af4list *n = __af4list_entry(s);
78 while (i != h && !n->valid) {
79 i = i->next;
80 n = __af4list_entry(i);
81 }
82 return n;
83 }
84
__af4list_valid_rcu(struct list_head * s,struct list_head * h)85 static inline struct netlbl_af4list *__af4list_valid_rcu(struct list_head *s,
86 struct list_head *h)
87 {
88 struct list_head *i = s;
89 struct netlbl_af4list *n = __af4list_entry(s);
90 while (i != h && !n->valid) {
91 i = rcu_dereference(i->next);
92 n = __af4list_entry(i);
93 }
94 return n;
95 }
96
97 #define netlbl_af4list_foreach(iter, head) \
98 for (iter = __af4list_valid((head)->next, head); \
99 prefetch(iter->list.next), &iter->list != (head); \
100 iter = __af4list_valid(iter->list.next, head))
101
102 #define netlbl_af4list_foreach_rcu(iter, head) \
103 for (iter = __af4list_valid_rcu((head)->next, head); \
104 prefetch(iter->list.next), &iter->list != (head); \
105 iter = __af4list_valid_rcu(iter->list.next, head))
106
107 #define netlbl_af4list_foreach_safe(iter, tmp, head) \
108 for (iter = __af4list_valid((head)->next, head), \
109 tmp = __af4list_valid(iter->list.next, head); \
110 &iter->list != (head); \
111 iter = tmp, tmp = __af4list_valid(iter->list.next, head))
112
113 int netlbl_af4list_add(struct netlbl_af4list *entry,
114 struct list_head *head);
115 struct netlbl_af4list *netlbl_af4list_remove(__be32 addr, __be32 mask,
116 struct list_head *head);
117 void netlbl_af4list_remove_entry(struct netlbl_af4list *entry);
118 struct netlbl_af4list *netlbl_af4list_search(__be32 addr,
119 struct list_head *head);
120 struct netlbl_af4list *netlbl_af4list_search_exact(__be32 addr,
121 __be32 mask,
122 struct list_head *head);
123
124 #ifdef CONFIG_AUDIT
125 void netlbl_af4list_audit_addr(struct audit_buffer *audit_buf,
126 int src, const char *dev,
127 __be32 addr, __be32 mask);
128 #else
netlbl_af4list_audit_addr(struct audit_buffer * audit_buf,int src,const char * dev,__be32 addr,__be32 mask)129 static inline void netlbl_af4list_audit_addr(struct audit_buffer *audit_buf,
130 int src, const char *dev,
131 __be32 addr, __be32 mask)
132 {
133 }
134 #endif
135
136 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
137
138 #define __af6list_entry(ptr) container_of(ptr, struct netlbl_af6list, list)
139
__af6list_valid(struct list_head * s,struct list_head * h)140 static inline struct netlbl_af6list *__af6list_valid(struct list_head *s,
141 struct list_head *h)
142 {
143 struct list_head *i = s;
144 struct netlbl_af6list *n = __af6list_entry(s);
145 while (i != h && !n->valid) {
146 i = i->next;
147 n = __af6list_entry(i);
148 }
149 return n;
150 }
151
__af6list_valid_rcu(struct list_head * s,struct list_head * h)152 static inline struct netlbl_af6list *__af6list_valid_rcu(struct list_head *s,
153 struct list_head *h)
154 {
155 struct list_head *i = s;
156 struct netlbl_af6list *n = __af6list_entry(s);
157 while (i != h && !n->valid) {
158 i = rcu_dereference(i->next);
159 n = __af6list_entry(i);
160 }
161 return n;
162 }
163
164 #define netlbl_af6list_foreach(iter, head) \
165 for (iter = __af6list_valid((head)->next, head); \
166 prefetch(iter->list.next), &iter->list != (head); \
167 iter = __af6list_valid(iter->list.next, head))
168
169 #define netlbl_af6list_foreach_rcu(iter, head) \
170 for (iter = __af6list_valid_rcu((head)->next, head); \
171 prefetch(iter->list.next), &iter->list != (head); \
172 iter = __af6list_valid_rcu(iter->list.next, head))
173
174 #define netlbl_af6list_foreach_safe(iter, tmp, head) \
175 for (iter = __af6list_valid((head)->next, head), \
176 tmp = __af6list_valid(iter->list.next, head); \
177 &iter->list != (head); \
178 iter = tmp, tmp = __af6list_valid(iter->list.next, head))
179
180 int netlbl_af6list_add(struct netlbl_af6list *entry,
181 struct list_head *head);
182 struct netlbl_af6list *netlbl_af6list_remove(const struct in6_addr *addr,
183 const struct in6_addr *mask,
184 struct list_head *head);
185 void netlbl_af6list_remove_entry(struct netlbl_af6list *entry);
186 struct netlbl_af6list *netlbl_af6list_search(const struct in6_addr *addr,
187 struct list_head *head);
188 struct netlbl_af6list *netlbl_af6list_search_exact(const struct in6_addr *addr,
189 const struct in6_addr *mask,
190 struct list_head *head);
191
192 #ifdef CONFIG_AUDIT
193 void netlbl_af6list_audit_addr(struct audit_buffer *audit_buf,
194 int src,
195 const char *dev,
196 const struct in6_addr *addr,
197 const struct in6_addr *mask);
198 #else
netlbl_af6list_audit_addr(struct audit_buffer * audit_buf,int src,const char * dev,const struct in6_addr * addr,const struct in6_addr * mask)199 static inline void netlbl_af6list_audit_addr(struct audit_buffer *audit_buf,
200 int src,
201 const char *dev,
202 const struct in6_addr *addr,
203 const struct in6_addr *mask)
204 {
205 }
206 #endif
207 #endif /* IPV6 */
208
209 #endif
210