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, see <http://www.gnu.org/licenses/>.
  28  *
  29  */
  30
  31 #ifndef _NETLABEL_DOMAINHASH_H
  32 #define _NETLABEL_DOMAINHASH_H
  33
  34 #include <linux/types.h>
  35 #include <linux/rcupdate.h>
  36 #include <linux/list.h>
  37
  38 #include "netlabel_addrlist.h"
  39
  40 /* Domain hash table size */
  41 /* XXX - currently this number is an uneducated guess */
  42 #define NETLBL_DOMHSH_BITSIZE       7
  43
  44 /* Domain mapping definition structures */
  45 struct netlbl_domaddr_map {
  46         struct list_head list4;
  47         struct list_head list6;
  48 };
  49 struct netlbl_dommap_def {
  50         u32 type;
  51         union {
  52                 struct netlbl_domaddr_map *addrsel;
  53                 struct cipso_v4_doi *cipso;
  54         };
  55 };
  56 #define netlbl_domhsh_addr4_entry(iter) \
  57         container_of(iter, struct netlbl_domaddr4_map, list)
  58 struct netlbl_domaddr4_map {
  59         struct netlbl_dommap_def def;
  60
  61         struct netlbl_af4list list;
  62 };
  63 #define netlbl_domhsh_addr6_entry(iter) \
  64         container_of(iter, struct netlbl_domaddr6_map, list)
  65 struct netlbl_domaddr6_map {
  66         struct netlbl_dommap_def def;
  67
  68         struct netlbl_af6list list;
  69 };
  70
  71 struct netlbl_dom_map {
  72         char *domain;
  73         struct netlbl_dommap_def def;
  74
  75         u32 valid;
  76         struct list_head list;
  77         struct rcu_head rcu;
  78 };
  79
  80 /* init function */
  81 int netlbl_domhsh_init(u32 size);
  82
  83 /* Manipulate the domain hash table */
  84 int netlbl_domhsh_add(struct netlbl_dom_map *entry,
  85                       struct netlbl_audit *audit_info);
  86 int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
  87                               struct netlbl_audit *audit_info);
  88 int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
  89                                struct netlbl_audit *audit_info);
  90 int netlbl_domhsh_remove_af4(const char *domain,
  91                              const struct in_addr *addr,
  92                              const struct in_addr *mask,
  93                              struct netlbl_audit *audit_info);
  94 int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info);
  95 int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info);
  96 struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain);
  97 struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain,
  98                                                      __be32 addr);
  99 #if IS_ENABLED(CONFIG_IPV6)
 100 struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain,
 101                                                    const struct in6_addr *addr);
 102 #endif /* IPv6 */
 103
 104 int netlbl_domhsh_walk(u32 *skip_bkt,
 105                      u32 *skip_chain,
 106                      int (*callback) (struct netlbl_dom_map *entry, void *arg),
 107                      void *cb_arg);
 108
 109 #endif