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.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
  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
  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
 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
 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
 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
 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