net/netlabel/netlabel_addrlist.h

   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@paul-moore.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, see <http://www.gnu.org/licenses/>.
  28  *
  29  */
  30
  31 #ifndef _NETLABEL_ADDRLIST_H
  32 #define _NETLABEL_ADDRLIST_H
  33
  34 #include <linux/types.h>
  35 #include <linux/rcupdate.h>
  36 #include <linux/list.h>
  37 #include <linux/in6.h>
  38 #include <linux/audit.h>
  39
  40 /**
  41  * struct netlbl_af4list - NetLabel IPv4 address list
  42  * @addr: IPv4 address
  43  * @mask: IPv4 address mask
  44  * @valid: valid flag
  45  * @list: list structure, used internally
  46  */
  47 struct netlbl_af4list {
  48         __be32 addr;
  49         __be32 mask;
  50
  51         u32 valid;
  52         struct list_head list;
  53 };
  54
  55 /**
  56  * struct netlbl_af6list - NetLabel IPv6 address list
  57  * @addr: IPv6 address
  58  * @mask: IPv6 address mask
  59  * @valid: valid flag
  60  * @list: list structure, used internally
  61  */
  62 struct netlbl_af6list {
  63         struct in6_addr addr;
  64         struct in6_addr mask;
  65
  66         u32 valid;
  67         struct list_head list;
  68 };
  69
  70 #define __af4list_entry(ptr) container_of(ptr, struct netlbl_af4list, list)
  71
  72 static inline struct netlbl_af4list *__af4list_valid(struct list_head *s,
  73                                                      struct list_head *h)
  74 {
  75         struct list_head *i = s;
  76         struct netlbl_af4list *n = __af4list_entry(s);
  77         while (i != h && !n->valid) {
  78                 i = i->next;
  79                 n = __af4list_entry(i);
  80         }
  81         return n;
  82 }
  83
  84 static inline struct netlbl_af4list *__af4list_valid_rcu(struct list_head *s,
  85                                                          struct list_head *h)
  86 {
  87         struct list_head *i = s;
  88         struct netlbl_af4list *n = __af4list_entry(s);
  89         while (i != h && !n->valid) {
  90                 i = rcu_dereference(list_next_rcu(i));
  91                 n = __af4list_entry(i);
  92         }
  93         return n;
  94 }
  95
  96 #define netlbl_af4list_foreach(iter, head)                              \
  97         for (iter = __af4list_valid((head)->next, head);                \
  98              &iter->list != (head);                                     \
  99              iter = __af4list_valid(iter->list.next, head))
 100
 101 #define netlbl_af4list_foreach_rcu(iter, head)                          \
 102         for (iter = __af4list_valid_rcu((head)->next, head);            \
 103              &iter->list != (head);                                     \
 104              iter = __af4list_valid_rcu(iter->list.next, head))
 105
 106 #define netlbl_af4list_foreach_safe(iter, tmp, head)                    \
 107         for (iter = __af4list_valid((head)->next, head),                \
 108                      tmp = __af4list_valid(iter->list.next, head);      \
 109              &iter->list != (head);                                     \
 110              iter = tmp, tmp = __af4list_valid(iter->list.next, head))
 111
 112 int netlbl_af4list_add(struct netlbl_af4list *entry,
 113                        struct list_head *head);
 114 struct netlbl_af4list *netlbl_af4list_remove(__be32 addr, __be32 mask,
 115                                              struct list_head *head);
 116 void netlbl_af4list_remove_entry(struct netlbl_af4list *entry);
 117 struct netlbl_af4list *netlbl_af4list_search(__be32 addr,
 118                                              struct list_head *head);
 119 struct netlbl_af4list *netlbl_af4list_search_exact(__be32 addr,
 120                                                    __be32 mask,
 121                                                    struct list_head *head);
 122
 123 #ifdef CONFIG_AUDIT
 124 void netlbl_af4list_audit_addr(struct audit_buffer *audit_buf,
 125                                int src, const char *dev,
 126                                __be32 addr, __be32 mask);
 127 #else
 128 static inline void netlbl_af4list_audit_addr(struct audit_buffer *audit_buf,
 129                                              int src, const char *dev,
 130                                              __be32 addr, __be32 mask)
 131 {
 132 }
 133 #endif
 134
 135 #if IS_ENABLED(CONFIG_IPV6)
 136
 137 #define __af6list_entry(ptr) container_of(ptr, struct netlbl_af6list, list)
 138
 139 static inline struct netlbl_af6list *__af6list_valid(struct list_head *s,
 140                                                      struct list_head *h)
 141 {
 142         struct list_head *i = s;
 143         struct netlbl_af6list *n = __af6list_entry(s);
 144         while (i != h && !n->valid) {
 145                 i = i->next;
 146                 n = __af6list_entry(i);
 147         }
 148         return n;
 149 }
 150
 151 static inline struct netlbl_af6list *__af6list_valid_rcu(struct list_head *s,
 152                                                          struct list_head *h)
 153 {
 154         struct list_head *i = s;
 155         struct netlbl_af6list *n = __af6list_entry(s);
 156         while (i != h && !n->valid) {
 157                 i = rcu_dereference(list_next_rcu(i));
 158                 n = __af6list_entry(i);
 159         }
 160         return n;
 161 }
 162
 163 #define netlbl_af6list_foreach(iter, head)                              \
 164         for (iter = __af6list_valid((head)->next, head);                \
 165              &iter->list != (head);                                     \
 166              iter = __af6list_valid(iter->list.next, head))
 167
 168 #define netlbl_af6list_foreach_rcu(iter, head)                          \
 169         for (iter = __af6list_valid_rcu((head)->next, head);            \
 170              &iter->list != (head);                                     \
 171              iter = __af6list_valid_rcu(iter->list.next, head))
 172
 173 #define netlbl_af6list_foreach_safe(iter, tmp, head)                    \
 174         for (iter = __af6list_valid((head)->next, head),                \
 175                      tmp = __af6list_valid(iter->list.next, head);      \
 176              &iter->list != (head);                                     \
 177              iter = tmp, tmp = __af6list_valid(iter->list.next, head))
 178
 179 int netlbl_af6list_add(struct netlbl_af6list *entry,
 180                        struct list_head *head);
 181 struct netlbl_af6list *netlbl_af6list_remove(const struct in6_addr *addr,
 182                                              const struct in6_addr *mask,
 183                                              struct list_head *head);
 184 void netlbl_af6list_remove_entry(struct netlbl_af6list *entry);
 185 struct netlbl_af6list *netlbl_af6list_search(const struct in6_addr *addr,
 186                                              struct list_head *head);
 187 struct netlbl_af6list *netlbl_af6list_search_exact(const struct in6_addr *addr,
 188                                                    const struct in6_addr *mask,
 189                                                    struct list_head *head);
 190
 191 #ifdef CONFIG_AUDIT
 192 void netlbl_af6list_audit_addr(struct audit_buffer *audit_buf,
 193                                int src,
 194                                const char *dev,
 195                                const struct in6_addr *addr,
 196                                const struct in6_addr *mask);
 197 #else
 198 static inline void netlbl_af6list_audit_addr(struct audit_buffer *audit_buf,
 199                                              int src,
 200                                              const char *dev,
 201                                              const struct in6_addr *addr,
 202                                              const struct in6_addr *mask)
 203 {
 204 }
 205 #endif
 206 #endif /* IPV6 */
 207
 208 #endif