/*
   * NetLabel Domain Hash Table
   *
   * This file manages the domain hash table that NetLabel uses to determine
   * which network labeling protocol to use for a given domain.  The NetLabel
   * system manages static and dynamic label mappings for network protocols such
   * as CIPSO and RIPSO.
   *

   * Author: Paul Moore <paul@paul-moore.com>

   *
   */
  
  /*

   * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008

   *
   * This program is free software;  you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY;  without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
   * the GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program;  if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   *
   */
  
  #ifndef _NETLABEL_DOMAINHASH_H
  #define _NETLABEL_DOMAINHASH_H

  #include <linux/types.h>
  #include <linux/rcupdate.h>
  #include <linux/list.h>

  #include "netlabel_addrlist.h"

  /* Domain hash table size */
  /* XXX - currently this number is an uneducated guess */
  #define NETLBL_DOMHSH_BITSIZE       7

  /* Domain mapping definition structures */
  #define netlbl_domhsh_addr4_entry(iter) \
  	container_of(iter, struct netlbl_domaddr4_map, list)
  struct netlbl_domaddr4_map {
  	u32 type;
  	union {
  		struct cipso_v4_doi *cipsov4;
  	} type_def;
  
  	struct netlbl_af4list list;
  };
  #define netlbl_domhsh_addr6_entry(iter) \
  	container_of(iter, struct netlbl_domaddr6_map, list)
  struct netlbl_domaddr6_map {
  	u32 type;
  
  	/* NOTE: no 'type_def' union needed at present since we don't currently
  	 *       support any IPv6 labeling protocols */
  
  	struct netlbl_af6list list;
  };
  struct netlbl_domaddr_map {
  	struct list_head list4;
  	struct list_head list6;
  };

  struct netlbl_dom_map {
  	char *domain;
  	u32 type;
  	union {
  		struct cipso_v4_doi *cipsov4;

  		struct netlbl_domaddr_map *addrsel;

  	} type_def;
  
  	u32 valid;
  	struct list_head list;
  	struct rcu_head rcu;
  };
  
  /* init function */
  int netlbl_domhsh_init(u32 size);
  
  /* Manipulate the domain hash table */

  int netlbl_domhsh_add(struct netlbl_dom_map *entry,
  		      struct netlbl_audit *audit_info);
  int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
  			      struct netlbl_audit *audit_info);

  int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
  			       struct netlbl_audit *audit_info);

  int netlbl_domhsh_remove_af4(const char *domain,
  			     const struct in_addr *addr,
  			     const struct in_addr *mask,
  			     struct netlbl_audit *audit_info);

  int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info);

  int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info);

  struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain);

  struct netlbl_domaddr4_map *netlbl_domhsh_getentry_af4(const char *domain,
  						       __be32 addr);

  int netlbl_domhsh_walk(u32 *skip_bkt,
  		     u32 *skip_chain,
  		     int (*callback) (struct netlbl_dom_map *entry, void *arg),
  		     void *cb_arg);

  #if IS_ENABLED(CONFIG_IPV6)

  struct netlbl_domaddr6_map *netlbl_domhsh_getentry_af6(const char *domain,
  						  const struct in6_addr *addr);
  #endif /* IPv6 */

  #endif