linux/net/netlabel/netlabel_user.c
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   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@paul-moore.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 */
  63int __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 */
  97struct 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                         from_kuid(&init_user_ns, 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}
 125
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