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|
/*
* 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 RFC 5412
*
* Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include "netdissect.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 39
#define LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE 40
static const struct tok lwapp_msg_type_values[] = {
{ LWAPP_MSGTYPE_DISCOVERY_REQUEST, "Discovery req"},
{ LWAPP_MSGTYPE_DISCOVERY_RESPONSE, "Discovery resp"},
{ LWAPP_MSGTYPE_JOIN_REQUEST, "Join req"},
{ LWAPP_MSGTYPE_JOIN_RESPONSE, "Join resp"},
{ LWAPP_MSGTYPE_JOIN_ACK, "Join ack"},
{ LWAPP_MSGTYPE_JOIN_CONFIRM, "Join confirm"},
{ LWAPP_MSGTYPE_CONFIGURE_REQUEST, "Configure req"},
{ LWAPP_MSGTYPE_CONFIGURE_RESPONSE, "Configure resp"},
{ LWAPP_MSGTYPE_CONF_UPDATE_REQUEST, "Update req"},
{ LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE, "Update resp"},
{ LWAPP_MSGTYPE_WTP_EVENT_REQUEST, "WTP event req"},
{ LWAPP_MSGTYPE_WTP_EVENT_RESPONSE, "WTP event resp"},
{ LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST, "Change state event req"},
{ LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE, "Change state event resp"},
{ LWAPP_MSGTYPE_ECHO_REQUEST, "Echo req"},
{ LWAPP_MSGTYPE_ECHO_RESPONSE, "Echo resp"},
{ LWAPP_MSGTYPE_IMAGE_DATA_REQUEST, "Image data req"},
{ LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE, "Image data resp"},
{ LWAPP_MSGTYPE_RESET_REQUEST, "Channel status req"},
{ LWAPP_MSGTYPE_RESET_RESPONSE, "Channel status resp"},
{ LWAPP_MSGTYPE_KEY_UPDATE_REQUEST, "Key update req"},
{ LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE, "Key update resp"},
{ LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST, "Primary discovery req"},
{ LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE, "Primary discovery resp"},
{ LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST, "Data transfer req"},
{ LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE, "Data transfer resp"},
{ LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION, "Clear config ind"},
{ LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST, "Wlan config req"},
{ LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE, "Wlan config resp"},
{ LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST, "Mobile config req"},
{ LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE, "Mobile config resp"},
{ 0, NULL}
};
/*
* LWAPP message elements
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type | Length | Value ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct lwapp_message_header {
uint8_t type;
uint8_t length[2];
};
void
lwapp_control_print(netdissect_options *ndo,
const u_char *pptr, u_int len, int has_ap_ident)
{
const struct lwapp_transport_header *lwapp_trans_header;
const struct lwapp_control_header *lwapp_control_header;
const u_char *tptr;
int tlen;
int msg_tlen;
tptr=pptr;
if (has_ap_ident) {
/* check if enough bytes for AP identity */
ND_TCHECK2(*tptr, 6);
lwapp_trans_header = (const struct lwapp_transport_header *)(pptr+6);
} else {
lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
}
ND_TCHECK(*lwapp_trans_header);
/*
* Sanity checking of the header.
*/
if (LWAPP_EXTRACT_VERSION(lwapp_trans_header->version) != LWAPP_VERSION) {
ND_PRINT((ndo, "LWAPP version %u packet not supported",
LWAPP_EXTRACT_VERSION(lwapp_trans_header->version)));
return;
}
/* non-verbose */
if (ndo->ndo_vflag < 1) {
ND_PRINT((ndo, "LWAPPv%u, %s frame, Flags [%s], length %u",
LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
len));
return;
}
/* ok they seem to want to know everything - lets fully decode it */
tlen=EXTRACT_16BITS(lwapp_trans_header->length);
ND_PRINT((ndo, "LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
LWAPP_EXTRACT_RID(lwapp_trans_header->version),
bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
lwapp_trans_header->frag_id,
tlen));
if (has_ap_ident) {
ND_PRINT((ndo, "\n\tAP identity: %s", etheraddr_string(ndo, tptr)));
tptr+=sizeof(const struct lwapp_transport_header)+6;
} else {
tptr+=sizeof(const struct lwapp_transport_header);
}
while(tlen>0) {
/* did we capture enough for fully decoding the object header ? */
ND_TCHECK2(*tptr, sizeof(struct lwapp_control_header));
lwapp_control_header = (const struct lwapp_control_header *)tptr;
msg_tlen = EXTRACT_16BITS(lwapp_control_header->len);
/* print message header */
ND_PRINT((ndo, "\n\t Msg type: %s (%u), Seqnum: %u, Msg len: %d, Session: 0x%08x",
tok2str(lwapp_msg_type_values,"Unknown",lwapp_control_header->msg_type),
lwapp_control_header->msg_type,
lwapp_control_header->seq_num,
msg_tlen,
EXTRACT_32BITS(lwapp_control_header->session_id)));
/* did we capture enough for fully decoding the message */
ND_TCHECK2(*tptr, msg_tlen);
/* XXX - Decode sub messages for each message */
switch(lwapp_control_header->msg_type) {
case LWAPP_MSGTYPE_DISCOVERY_REQUEST:
case LWAPP_MSGTYPE_DISCOVERY_RESPONSE:
case LWAPP_MSGTYPE_JOIN_REQUEST:
case LWAPP_MSGTYPE_JOIN_RESPONSE:
case LWAPP_MSGTYPE_JOIN_ACK:
case LWAPP_MSGTYPE_JOIN_CONFIRM:
case LWAPP_MSGTYPE_CONFIGURE_REQUEST:
case LWAPP_MSGTYPE_CONFIGURE_RESPONSE:
case LWAPP_MSGTYPE_CONF_UPDATE_REQUEST:
case LWAPP_MSGTYPE_CONF_UPDATE_RESPONSE:
case LWAPP_MSGTYPE_WTP_EVENT_REQUEST:
case LWAPP_MSGTYPE_WTP_EVENT_RESPONSE:
case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_REQUEST:
case LWAPP_MSGTYPE_CHANGE_STATE_EVENT_RESPONSE:
case LWAPP_MSGTYPE_ECHO_REQUEST:
case LWAPP_MSGTYPE_ECHO_RESPONSE:
case LWAPP_MSGTYPE_IMAGE_DATA_REQUEST:
case LWAPP_MSGTYPE_IMAGE_DATA_RESPONSE:
case LWAPP_MSGTYPE_RESET_REQUEST:
case LWAPP_MSGTYPE_RESET_RESPONSE:
case LWAPP_MSGTYPE_KEY_UPDATE_REQUEST:
case LWAPP_MSGTYPE_KEY_UPDATE_RESPONSE:
case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_REQUEST:
case LWAPP_MSGTYPE_PRIMARY_DISCOVERY_RESPONSE:
case LWAPP_MSGTYPE_DATA_TRANSFER_REQUEST:
case LWAPP_MSGTYPE_DATA_TRANSFER_RESPONSE:
case LWAPP_MSGTYPE_CLEAR_CONFIG_INDICATION:
case LWAPP_MSGTYPE_WLAN_CONFIG_REQUEST:
case LWAPP_MSGTYPE_WLAN_CONFIG_RESPONSE:
case LWAPP_MSGTYPE_MOBILE_CONFIG_REQUEST:
case LWAPP_MSGTYPE_MOBILE_CONFIG_RESPONSE:
default:
break;
}
tptr += sizeof(struct lwapp_control_header) + msg_tlen;
tlen -= sizeof(struct lwapp_control_header) + msg_tlen;
}
return;
trunc:
ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
}
void
lwapp_data_print(netdissect_options *ndo,
const u_char *pptr, u_int len)
{
const struct lwapp_transport_header *lwapp_trans_header;
const u_char *tptr;
int tlen;
tptr=pptr;
/* check if enough bytes for AP identity */
ND_TCHECK2(*tptr, 6);
lwapp_trans_header = (const struct lwapp_transport_header *)pptr;
ND_TCHECK(*lwapp_trans_header);
/*
* Sanity checking of the header.
*/
if (LWAPP_EXTRACT_VERSION(lwapp_trans_header->version) != LWAPP_VERSION) {
ND_PRINT((ndo, "LWAPP version %u packet not supported",
LWAPP_EXTRACT_VERSION(lwapp_trans_header->version)));
return;
}
/* non-verbose */
if (ndo->ndo_vflag < 1) {
ND_PRINT((ndo, "LWAPPv%u, %s frame, Flags [%s], length %u",
LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
len));
return;
}
/* ok they seem to want to know everything - lets fully decode it */
tlen=EXTRACT_16BITS(lwapp_trans_header->length);
ND_PRINT((ndo, "LWAPPv%u, %s frame, Radio-id %u, Flags [%s], Frag-id %u, length %u",
LWAPP_EXTRACT_VERSION(lwapp_trans_header->version),
LWAPP_EXTRACT_CONTROL_BIT(lwapp_trans_header->version) ? "Control" : "Data",
LWAPP_EXTRACT_RID(lwapp_trans_header->version),
bittok2str(lwapp_header_bits_values,"none",(lwapp_trans_header->version)&0x07),
lwapp_trans_header->frag_id,
tlen));
tptr+=sizeof(const struct lwapp_transport_header);
tlen-=sizeof(const struct lwapp_transport_header);
/* FIX - An IEEE 802.11 frame follows - hexdump for now */
print_unknown_data(ndo, tptr, "\n\t", tlen);
return;
trunc:
ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
}
/*
* Local Variables:
* c-style: whitesmith
* c-basic-offset: 8
* End:
*/
|
