net/netlabel/netlabel_domainhash.h

   1 /*
   2  * NetLabel Domain Hash Table
   3  *
   4  * This file manages the domain hash table that NetLabel uses to determine
   5  * which network labeling protocol to use for a given domain.  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., 2006
  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_DOMAINHASH_H
  33 #define _NETLABEL_DOMAINHASH_H
  34
  35 #include <linux/types.h>
  36 #include <linux/rcupdate.h>
  37 #include <linux/list.h>
  38
  39 /* Domain hash table size */
  40 /* XXX - currently this number is an uneducated guess */
  41 #define NETLBL_DOMHSH_BITSIZE       7
  42
  43 /* Domain mapping definition struct */
  44 struct netlbl_dom_map {
  45         char *domain;
  46         u32 type;
  47         union {
  48                 struct cipso_v4_doi *cipsov4;
  49         } type_def;
  50
  51         u32 valid;
  52         struct list_head list;
  53         struct rcu_head rcu;
  54 };
  55
  56 /* init function */
  57 int netlbl_domhsh_init(u32 size);
  58
  59 /* Manipulate the domain hash table */
  60 int netlbl_domhsh_add(struct netlbl_dom_map *entry,
  61                       struct netlbl_audit *audit_info);
  62 int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
  63                               struct netlbl_audit *audit_info);
  64 int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info);
  65 int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info);
  66 struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain);
  67 int netlbl_domhsh_walk(u32 *skip_bkt,
  68                      u32 *skip_chain,
  69                      int (*callback) (struct netlbl_dom_map *entry, void *arg),
  70                      void *cb_arg);
  71
  72 #endif