/*
   * NetLabel Unlabeled Support
   *
   * This file defines functions for dealing with unlabeled packets for the
   * NetLabel system.  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
   *
   * 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_UNLABELED_H
  #define _NETLABEL_UNLABELED_H
  
  #include <net/netlabel.h>
  
  /*
   * The following NetLabel payloads are supported by the Unlabeled subsystem.
   *

   * o STATICADD
   *   This message is sent from an application to add a new static label for
   *   incoming unlabeled connections.
   *
   *   Required attributes:
   *
   *     NLBL_UNLABEL_A_IFACE
   *     NLBL_UNLABEL_A_SECCTX
   *
   *   If IPv4 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV4ADDR
   *     NLBL_UNLABEL_A_IPV4MASK
   *
   *   If IPv6 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV6ADDR
   *     NLBL_UNLABEL_A_IPV6MASK
   *
   * o STATICREMOVE
   *   This message is sent from an application to remove an existing static
   *   label for incoming unlabeled connections.
   *
   *   Required attributes:
   *
   *     NLBL_UNLABEL_A_IFACE
   *
   *   If IPv4 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV4ADDR
   *     NLBL_UNLABEL_A_IPV4MASK
   *
   *   If IPv6 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV6ADDR
   *     NLBL_UNLABEL_A_IPV6MASK
   *
   * o STATICLIST
   *   This message can be sent either from an application or by the kernel in
   *   response to an application generated STATICLIST message.  When sent by an
   *   application there is no payload and the NLM_F_DUMP flag should be set.
   *   The kernel should response with a series of the following messages.
   *
   *   Required attributes:
   *
   *     NLBL_UNLABEL_A_IFACE
   *     NLBL_UNLABEL_A_SECCTX
   *
   *   If IPv4 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV4ADDR
   *     NLBL_UNLABEL_A_IPV4MASK
   *
   *   If IPv6 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV6ADDR
   *     NLBL_UNLABEL_A_IPV6MASK
   *
   * o STATICADDDEF
   *   This message is sent from an application to set the default static
   *   label for incoming unlabeled connections.
   *
   *   Required attribute:
   *
   *     NLBL_UNLABEL_A_SECCTX
   *
   *   If IPv4 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV4ADDR
   *     NLBL_UNLABEL_A_IPV4MASK
   *
   *   If IPv6 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV6ADDR
   *     NLBL_UNLABEL_A_IPV6MASK
   *
   * o STATICREMOVEDEF
   *   This message is sent from an application to remove the existing default
   *   static label for incoming unlabeled connections.
   *
   *   If IPv4 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV4ADDR
   *     NLBL_UNLABEL_A_IPV4MASK
   *
   *   If IPv6 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV6ADDR
   *     NLBL_UNLABEL_A_IPV6MASK
   *
   * o STATICLISTDEF
   *   This message can be sent either from an application or by the kernel in
   *   response to an application generated STATICLISTDEF message.  When sent by
   *   an application there is no payload and the NLM_F_DUMP flag should be set.
   *   The kernel should response with the following message.
   *
   *   Required attribute:
   *
   *     NLBL_UNLABEL_A_SECCTX
   *
   *   If IPv4 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV4ADDR
   *     NLBL_UNLABEL_A_IPV4MASK
   *
   *   If IPv6 is specified the following attributes are required:
   *
   *     NLBL_UNLABEL_A_IPV6ADDR
   *     NLBL_UNLABEL_A_IPV6MASK
   *

   * o ACCEPT
   *   This message is sent from an application to specify if the kernel should
   *   allow unlabled packets to pass if they do not match any of the static
   *   mappings defined in the unlabeled module.
   *

   *   Required attributes:

   *

   *     NLBL_UNLABEL_A_ACPTFLG

   *
   * o LIST
   *   This message can be sent either from an application or by the kernel in
   *   response to an application generated LIST message.  When sent by an
   *   application there is no payload.  The kernel should respond to a LIST

   *   message with a LIST message on success.

   *

   *   Required attributes:

   *

   *     NLBL_UNLABEL_A_ACPTFLG

   *
   */
  
  /* NetLabel Unlabeled commands */
  enum {
  	NLBL_UNLABEL_C_UNSPEC,

  	NLBL_UNLABEL_C_ACCEPT,
  	NLBL_UNLABEL_C_LIST,

  	NLBL_UNLABEL_C_STATICADD,
  	NLBL_UNLABEL_C_STATICREMOVE,
  	NLBL_UNLABEL_C_STATICLIST,
  	NLBL_UNLABEL_C_STATICADDDEF,
  	NLBL_UNLABEL_C_STATICREMOVEDEF,
  	NLBL_UNLABEL_C_STATICLISTDEF,

  	__NLBL_UNLABEL_C_MAX,
  };

  /* NetLabel Unlabeled attributes */
  enum {
  	NLBL_UNLABEL_A_UNSPEC,
  	NLBL_UNLABEL_A_ACPTFLG,
  	/* (NLA_U8)
  	 * if true then unlabeled packets are allowed to pass, else unlabeled
  	 * packets are rejected */

  	NLBL_UNLABEL_A_IPV6ADDR,
  	/* (NLA_BINARY, struct in6_addr)
  	 * an IPv6 address */
  	NLBL_UNLABEL_A_IPV6MASK,
  	/* (NLA_BINARY, struct in6_addr)
  	 * an IPv6 address mask */
  	NLBL_UNLABEL_A_IPV4ADDR,
  	/* (NLA_BINARY, struct in_addr)
  	 * an IPv4 address */
  	NLBL_UNLABEL_A_IPV4MASK,
  	/* (NLA_BINARY, struct in_addr)
  	 * and IPv4 address mask */
  	NLBL_UNLABEL_A_IFACE,
  	/* (NLA_NULL_STRING)
  	 * network interface */
  	NLBL_UNLABEL_A_SECCTX,
  	/* (NLA_BINARY)
  	 * a LSM specific security context */

  	__NLBL_UNLABEL_A_MAX,
  };
  #define NLBL_UNLABEL_A_MAX (__NLBL_UNLABEL_A_MAX - 1)

  /* NetLabel protocol functions */
  int netlbl_unlabel_genl_init(void);

  /* Unlabeled connection hash table size */
  /* XXX - currently this number is an uneducated guess */
  #define NETLBL_UNLHSH_BITSIZE       7
  
  /* General Unlabeled init function */
  int netlbl_unlabel_init(u32 size);

  /* Static/Fallback label management functions */
  int netlbl_unlhsh_add(struct net *net,
  		      const char *dev_name,
  		      const void *addr,
  		      const void *mask,
  		      u32 addr_len,
  		      u32 secid,
  		      struct netlbl_audit *audit_info);
  int netlbl_unlhsh_remove(struct net *net,
  			 const char *dev_name,
  			 const void *addr,
  			 const void *mask,
  			 u32 addr_len,
  			 struct netlbl_audit *audit_info);

  /* Process Unlabeled incoming network packets */

  int netlbl_unlabel_getattr(const struct sk_buff *skb,
  			   u16 family,
  			   struct netlbl_lsm_secattr *secattr);

  
  /* Set the default configuration to allow Unlabeled packets */
  int netlbl_unlabel_defconf(void);
  
  #endif