release/src-rt-6.x.4708/linux/linux-2.6.36/net/netlabel/netlabel_user.c

   1 /*
   2  * NetLabel NETLINK Interface
   3  *
   4  * This file defines the NETLINK interface for the NetLabel system.  The
   5  * NetLabel system manages static and dynamic label mappings for network
   6  * protocols such as CIPSO and RIPSO.
   7  *
   8  * Author: Paul Moore <paul.moore@hp.com>
   9  *
  10  */
  11
  12 /*
  13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
  14  *
  15  * This program is free software;  you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  23  * the GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program;  if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28  *
  29  */
  30
  31 #include <linux/init.h>
  32 #include <linux/types.h>
  33 #include <linux/list.h>
  34 #include <linux/socket.h>
  35 #include <linux/audit.h>
  36 #include <linux/tty.h>
  37 #include <linux/security.h>
  38 #include <linux/gfp.h>
  39 #include <net/sock.h>
  40 #include <net/netlink.h>
  41 #include <net/genetlink.h>
  42 #include <net/netlabel.h>
  43 #include <asm/bug.h>
  44
  45 #include "netlabel_mgmt.h"
  46 #include "netlabel_unlabeled.h"
  47 #include "netlabel_cipso_v4.h"
  48 #include "netlabel_user.h"
  49
  50 /*
  51  * NetLabel NETLINK Setup Functions
  52  */
  53
  54 /**
  55  * netlbl_netlink_init - Initialize the NETLINK communication channel
  56  *
  57  * Description:
  58  * Call out to the NetLabel components so they can register their families and
  59  * commands with the Generic NETLINK mechanism.  Returns zero on success and
  60  * non-zero on failure.
  61  *
  62  */
  63 int __init netlbl_netlink_init(void)
  64 {
  65         int ret_val;
  66
  67         ret_val = netlbl_mgmt_genl_init();
  68         if (ret_val != 0)
  69                 return ret_val;
  70
  71         ret_val = netlbl_cipsov4_genl_init();
  72         if (ret_val != 0)
  73                 return ret_val;
  74
  75         ret_val = netlbl_unlabel_genl_init();
  76         if (ret_val != 0)
  77                 return ret_val;
  78
  79         return 0;
  80 }
  81
  82 /*
  83  * NetLabel Audit Functions
  84  */
  85
  86 /**
  87  * netlbl_audit_start_common - Start an audit message
  88  * @type: audit message type
  89  * @audit_info: NetLabel audit information
  90  *
  91  * Description:
  92  * Start an audit message using the type specified in @type and fill the audit
  93  * message with some fields common to all NetLabel audit messages.  Returns
  94  * a pointer to the audit buffer on success, NULL on failure.
  95  *
  96  */
  97 struct audit_buffer *netlbl_audit_start_common(int type,
  98                                                struct netlbl_audit *audit_info)
  99 {
 100         struct audit_buffer *audit_buf;
 101         char *secctx;
 102         u32 secctx_len;
 103
 104         if (audit_enabled == 0)
 105                 return NULL;
 106
 107         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
 108         if (audit_buf == NULL)
 109                 return NULL;
 110
 111         audit_log_format(audit_buf, "netlabel: auid=%u ses=%u",
 112                          audit_info->loginuid,
 113                          audit_info->sessionid);
 114
 115         if (audit_info->secid != 0 &&
 116             security_secid_to_secctx(audit_info->secid,
 117                                      &secctx,
 118                                      &secctx_len) == 0) {
 119                 audit_log_format(audit_buf, " subj=%s", secctx);
 120                 security_release_secctx(secctx, secctx_len);
 121         }
 122
 123         return audit_buf;
 124 }