net/netlabel/netlabel_unlabeled.h

   1 /*
   2  * NetLabel Unlabeled Support
   3  *
   4  * This file defines functions for dealing with unlabeled packets for the
   5  * NetLabel system.  The NetLabel system manages static and dynamic label
   6  * mappings for network 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 #ifndef _NETLABEL_UNLABELED_H
  32 #define _NETLABEL_UNLABELED_H
  33
  34 #include <net/netlabel.h>
  35
  36 /*
  37  * The following NetLabel payloads are supported by the Unlabeled subsystem.
  38  *
  39  * o ACK:
  40  *   Sent by the kernel in response to an applications message, applications
  41  *   should never send this message.
  42  *
  43  *   +----------------------+-----------------------+
  44  *   | seq number (32 bits) | return code (32 bits) |
  45  *   +----------------------+-----------------------+
  46  *
  47  *     seq number:  the sequence number of the original message, taken from the
  48  *                  nlmsghdr structure
  49  *     return code: return value, based on errno values
  50  *
  51  * o ACCEPT
  52  *   This message is sent from an application to specify if the kernel should
  53  *   allow unlabled packets to pass if they do not match any of the static
  54  *   mappings defined in the unlabeled module.
  55  *
  56  *   +-----------------+
  57  *   | allow (32 bits) |
  58  *   +-----------------+
  59  *
  60  *     allow: if true (1) then allow the packets to pass, if false (0) then
  61  *            reject the packets
  62  *
  63  * o LIST
  64  *   This message can be sent either from an application or by the kernel in
  65  *   response to an application generated LIST message.  When sent by an
  66  *   application there is no payload.  The kernel should respond to a LIST
  67  *   message either with a LIST message on success or an ACK message on
  68  *   failure.
  69  *
  70  *   +-----------------------+
  71  *   | accept flag (32 bits) |
  72  *   +-----------------------+
  73  *
  74  *     accept flag: if true (1) then unlabeled packets are allowed to pass,
  75  *                  if false (0) then unlabeled packets are rejected
  76  *
  77  */
  78
  79 /* NetLabel Unlabeled commands */
  80 enum {
  81         NLBL_UNLABEL_C_UNSPEC,
  82         NLBL_UNLABEL_C_ACK,
  83         NLBL_UNLABEL_C_ACCEPT,
  84         NLBL_UNLABEL_C_LIST,
  85         __NLBL_UNLABEL_C_MAX,
  86 };
  87 #define NLBL_UNLABEL_C_MAX (__NLBL_UNLABEL_C_MAX - 1)
  88
  89 /* NetLabel protocol functions */
  90 int netlbl_unlabel_genl_init(void);
  91
  92 /* Process Unlabeled incoming network packets */
  93 int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr);
  94
  95 /* Set the default configuration to allow Unlabeled packets */
  96 int netlbl_unlabel_defconf(void);
  97
  98 #endif