/*
   * NetLabel NETLINK Interface
   *
   * This file defines the NETLINK interface 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, see <http://www.gnu.org/licenses/>.
   *
   */
  
  #include <linux/init.h>
  #include <linux/types.h>
  #include <linux/list.h>
  #include <linux/socket.h>
  #include <linux/audit.h>
  #include <linux/tty.h>
  #include <linux/security.h>
  #include <linux/gfp.h>
  #include <net/sock.h>
  #include <net/netlink.h>
  #include <net/genetlink.h>
  #include <net/netlabel.h>
  #include <asm/bug.h>
  
  #include "netlabel_mgmt.h"
  #include "netlabel_unlabeled.h"
  #include "netlabel_cipso_v4.h"
  #include "netlabel_user.h"
  
  /*
   * NetLabel NETLINK Setup Functions
   */
  
  /**
   * netlbl_netlink_init - Initialize the NETLINK communication channel
   *
   * Description:
   * Call out to the NetLabel components so they can register their families and
   * commands with the Generic NETLINK mechanism.  Returns zero on success and
   * non-zero on failure.
   *
   */
  int __init netlbl_netlink_init(void)
  {
  	int ret_val;
  
  	ret_val = netlbl_mgmt_genl_init();
  	if (ret_val != 0)
  		return ret_val;
  
  	ret_val = netlbl_cipsov4_genl_init();
  	if (ret_val != 0)
  		return ret_val;
  
  	ret_val = netlbl_unlabel_genl_init();
  	if (ret_val != 0)
  		return ret_val;
  
  	return 0;
  }
  
  /*
   * NetLabel Audit Functions
   */
  
  /**
   * netlbl_audit_start_common - Start an audit message
   * @type: audit message type
   * @audit_info: NetLabel audit information
   *
   * Description:
   * Start an audit message using the type specified in @type and fill the audit
   * message with some fields common to all NetLabel audit messages.  Returns
   * a pointer to the audit buffer on success, NULL on failure.
   *
   */
  struct audit_buffer *netlbl_audit_start_common(int type,
  					       struct netlbl_audit *audit_info)
  {
  	struct audit_buffer *audit_buf;
  	char *secctx;
  	u32 secctx_len;
  
  	if (audit_enabled == 0)
  		return NULL;
  
  	audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
  	if (audit_buf == NULL)
  		return NULL;
  
  	audit_log_format(audit_buf, "netlabel: auid=%u ses=%u",
  			 from_kuid(&init_user_ns, audit_info->loginuid),
  			 audit_info->sessionid);
  
  	if (audit_info->secid != 0 &&
  	    security_secid_to_secctx(audit_info->secid,
  				     &secctx,
  				     &secctx_len) == 0) {
  		audit_log_format(audit_buf, " subj=%s", secctx);
  		security_release_secctx(secctx, secctx_len);
  	}
  
  	return audit_buf;
  }