linux/net/netlabel/netlabel_domainhash.h
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   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)
  48struct 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)
  58struct 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};
  66struct netlbl_domaddr_map {
  67        struct list_head list4;
  68        struct list_head list6;
  69};
  70struct 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 */
  84int netlbl_domhsh_init(u32 size);
  85
  86/* Manipulate the domain hash table */
  87int netlbl_domhsh_add(struct netlbl_dom_map *entry,
  88                      struct netlbl_audit *audit_info);
  89int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
  90                              struct netlbl_audit *audit_info);
  91int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
  92                               struct netlbl_audit *audit_info);
  93int 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);
  97int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info);
  98int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info);
  99struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain);
 100struct netlbl_domaddr4_map *netlbl_domhsh_getentry_af4(const char *domain,
 101                                                       __be32 addr);
 102int 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)
 108struct netlbl_domaddr6_map *netlbl_domhsh_getentry_af6(const char *domain,
 109                                                  const struct in6_addr *addr);
 110#endif /* IPv6 */
 111
 112#endif
 113
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