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@paul-moore.com>
  10  *
  11  */
  12
  13 /*
  14  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 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_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 #include "netlabel_addrlist.h"
  40
  41 /* Domain hash table size */
  42 /* XXX - currently this number is an uneducated guess */
  43 #define NETLBL_DOMHSH_BITSIZE       7
  44
  45 /* Domain mapping definition structures */
  46 #define netlbl_domhsh_addr4_entry(iter) \
  47         container_of(iter, struct netlbl_domaddr4_map, list)
  48 struct netlbl_domaddr4_map {
  49         u32 type;
  50         union {
  51                 struct cipso_v4_doi *cipsov4;
  52         } type_def;
  53
  54         struct netlbl_af4list list;
  55 };
  56 #define netlbl_domhsh_addr6_entry(iter) \
  57         container_of(iter, struct netlbl_domaddr6_map, list)
  58 struct netlbl_domaddr6_map {
  59         u32 type;
  60
  61         /* NOTE: no 'type_def' union needed at present since we don't currently
  62          *       support any IPv6 labeling protocols */
  63
  64         struct netlbl_af6list list;
  65 };
  66 struct netlbl_domaddr_map {
  67         struct list_head list4;
  68         struct list_head list6;
  69 };
  70 struct netlbl_dom_map {
  71         char *domain;
  72         u32 type;
  73         union {
  74                 struct cipso_v4_doi *cipsov4;
  75                 struct netlbl_domaddr_map *addrsel;
  76         } type_def;
  77
  78         u32 valid;
  79         struct list_head list;
  80         struct rcu_head rcu;
  81 };
  82
  83 /* init function */
  84 int netlbl_domhsh_init(u32 size);
  85
  86 /* Manipulate the domain hash table */
  87 int netlbl_domhsh_add(struct netlbl_dom_map *entry,
  88                       struct netlbl_audit *audit_info);
  89 int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
  90                               struct netlbl_audit *audit_info);
  91 int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
  92                                struct netlbl_audit *audit_info);
  93 int netlbl_domhsh_remove_af4(const char *domain,
  94                              const struct in_addr *addr,
  95                              const struct in_addr *mask,
  96                              struct netlbl_audit *audit_info);
  97 int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info);
  98 int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info);
  99 struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain);
 100 struct netlbl_domaddr4_map *netlbl_domhsh_getentry_af4(const char *domain,
 101                                                        __be32 addr);
 102 int netlbl_domhsh_walk(u32 *skip_bkt,
 103                      u32 *skip_chain,
 104                      int (*callback) (struct netlbl_dom_map *entry, void *arg),
 105                      void *cb_arg);
 106
 107 #if IS_ENABLED(CONFIG_IPV6)
 108 struct netlbl_domaddr6_map *netlbl_domhsh_getentry_af6(const char *domain,
 109                                                   const struct in6_addr *addr);
 110 #endif /* IPv6 */
 111
 112 #endif