/*
 * Copyright (c) 1998-2007 The TCPDUMP project
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code
 * distributions retain the above copyright notice and this paragraph
 * in its entirety, and (2) distributions including binary code include
 * the above copyright notice and this paragraph in its entirety in
 * the documentation or other materials provided with the distribution.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE.
 *
 * Support for the Light Weight Access Point Protocol as per draft-ohara-capwap-lwapp-04
 *
 * Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
 */

#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include "interface.h"
#include "extract.h"
#include "addrtoname.h"

/*
 * LWAPP transport (common) header
 *      0                   1                   2                   3
 *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *    |VER| RID |C|F|L|    Frag ID    |            Length             |
 *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *    |          Status/WLANs         |   Payload...  |
 *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 */

struct lwapp_transport_header {
    uint8_t  version;
    uint8_t  frag_id;
    uint8_t  length[2];
    uint16_t status;
};

/*
 * LWAPP control header
 *      0                   1                   2                   3
 *      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *     |  Message Type |    Seq Num    |      Msg Element Length       |
 *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *     |                           Session ID                          |
 *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *     |      Msg Element [0..N]       |
 *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 */

struct lwapp_control_header {
    uint8_t  msg_type;
    uint8_t  seq_num;
    uint8_t  len[2];
    uint8_t  session_id[4];
};

#define LWAPP_VERSION 0
#define	LWAPP_EXTRACT_VERSION(x) (((x)&0xC0)>>6)
#define	LWAPP_EXTRACT_RID(x) (((x)&0x38)>>3)
#define LWAPP_EXTRACT_CONTROL_BIT(x) (((x)&0x04)>>2)

static const struct tok lwapp_header_bits_values[] = {
    { 0x01, "Last Fragment Bit"},
    { 0x02, "Fragment Bit"},
    { 0x04, "Control Bit"},
    { 0, NULL}
};

#define	LWAPP_MSGTYPE_DISCOVERY_REQUEST			1
#define	LWAPP_MSGTYPE_DISCOVERY_RESPONSE		2
#define	LWAPP_MSGTYPE_JOIN_REQUEST			3
#define LWAPP_MSGTYPE_JOIN_RESPONSE			4
#define LWAPP_MSGTYPE_JOIN_ACK				5
#define LWAPP_MSGTYPE_JOIN_CONFIRM			6
#define LWAPP_MSGTYPE_CONFIGURE_REQUEST			10
#define LWAPP_MSGTYPE_CONFIGURE_RESPONSE		11
#define LWAPP_MSGTYPE_CONF_UPDATE_REQUEST		12
#define LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE		13
#define LWAPP_MSGTYPE_WTP_EVENT_REQUEST			14
#define LWAPP_MSGTYPE_WTP_EVENT_RESPONSE		15
#define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST	16
#define LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE	17
#define LWAPP_MSGTYPE_ECHO_REQUEST			22
#define LWAPP_MSGTYPE_ECHO_RESPONSE			23
#define LWAPP_MSGTYPE_IMAGE_DATA_REQUEST		24
#define LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE		25
#define LWAPP_MSGTYPE_RESET_REQUEST			26
#define LWAPP_MSGTYPE_RESET_RESPONSE			27
#define LWAPP_MSGTYPE_KEY_UPDATE_REQUEST		30
#define LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE		31
#define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST		32
#define LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE	33
#define LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST		34
#define LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE		35
#define LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION		36
#define LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST		37
#define LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE		38
#define LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST		3