* Copyright (c) 2009

/*
* Copyright (c) 2009
* Siemens AG, All rights reserved.
* Dmitry Eremin-Solenikov ([email protected])
*
* 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, (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, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* 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.
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-802_15_4.c,v 1.6 2024/09/02 16:15:30 christos Exp $");
#endif

/* \summary: IEEE 802.15.4 printer */

#include <config.h>

#include "netdissect-stdinc.h"

#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "addrtoname.h"

#include "extract.h"

#define CHECK_BIT(num,bit) (((num) >> (bit)) & 0x1)

#define BROKEN_6TISCH_PAN_ID_COMPRESSION 0

/* Frame types from Table 7-1 of 802.15.4-2015 */
static const char *ftypes[] = {
"Beacon", /* 0 */
"Data", /* 1 */
"ACK", /* 2 */
"Command", /* 3 */
"Reserved", /* 4 */
"Multipurpose", /* 5 */
"Fragment", /* 6 */
"Extended" /* 7 */
};

/* Element IDs for Header IEs from Table 7-7 of 802.15.4-2015 */
static const char *h_ie_names[] = {
"Vendor Specific Header IE", /* 0x00 */
"Reserved 0x01", /* 0x01 */
"Reserved 0x02", /* 0x02 */
"Reserved 0x03", /* 0x03 */
"Reserved 0x04", /* 0x04 */
"Reserved 0x05", /* 0x05 */
"Reserved 0x06", /* 0x06 */
"Reserved 0x07", /* 0x07 */
"Reserved 0x08", /* 0x08 */
"Reserved 0x09", /* 0x09 */
"Reserved 0x0a", /* 0x0a */
"Reserved 0x0b", /* 0x0b */
"Reserved 0x0c", /* 0x0c */
"Reserved 0x0d", /* 0x0d */
"Reserved 0x0e", /* 0x0e */
"Reserved 0x0f", /* 0x0f */
"Reserved 0x10", /* 0x10 */
"Reserved 0x11", /* 0x11 */
"Reserved 0x12", /* 0x12 */
"Reserved 0x13", /* 0x13 */
"Reserved 0x14", /* 0x14 */
"Reserved 0x15", /* 0x15 */
"Reserved 0x16", /* 0x16 */
"Reserved 0x17", /* 0x17 */
"Reserved 0x18", /* 0x18 */
"Reserved 0x19", /* 0x19 */
"LE CSL IE", /* 0x1a */
"LE RIT IE", /* 0x1b */
"DSME PAN descriptor IE", /* 0x1c */
"Rendezvous Time IE", /* 0x1d */
"Time Correction IE", /* 0x1e */
"Reserved 0x1f", /* 0x1f */
"Reserved 0x20", /* 0x20 */
"Extended DSME PAN descriptor IE", /* 0x21 */
"Fragment Sequence Context Description IE", /* 0x22 */
"Simplified Superframe Specification IE", /* 0x23 */
"Simplified GTS Specification IE", /* 0x24 */
"LECIM Capabilities IE", /* 0x25 */
"TRLE Descriptor IE", /* 0x26 */
"RCC Capabilities IE", /* 0x27 */
"RCCN Descriptor IE", /* 0x28 */
"Global Time IE", /* 0x29 */
"Omnibus Header IE", /* 0x2a */
"DA IE", /* 0x2b */
"Reserved 0x2c", /* 0x2c */
"Reserved 0x2d", /* 0x2d */
"Reserved 0x2e", /* 0x2e */
"Reserved 0x2f", /* 0x2f */
"Reserved 0x30", /* 0x30 */
"Reserved 0x31", /* 0x31 */
"Reserved 0x32", /* 0x32 */
"Reserved 0x33", /* 0x33 */
"Reserved 0x34", /* 0x34 */
"Reserved 0x35", /* 0x35 */
"Reserved 0x36", /* 0x36 */
"Reserved 0x37", /* 0x37 */
"Reserved 0x38", /* 0x38 */
"Reserved 0x39", /* 0x39 */
"Reserved 0x3a", /* 0x3a */
"Reserved 0x3b", /* 0x3b */
"Reserved 0x3c", /* 0x3c */
"Reserved 0x3d", /* 0x3d */
"Reserved 0x3e", /* 0x3e */
"Reserved 0x3f", /* 0x3f */
"Reserved 0x40", /* 0x40 */
"Reserved 0x41", /* 0x41 */
"Reserved 0x42", /* 0x42 */
"Reserved 0x43", /* 0x43 */
"Reserved 0x44", /* 0x44 */
"Reserved 0x45", /* 0x45 */
"Reserved 0x46", /* 0x46 */
"Reserved 0x47", /* 0x47 */
"Reserved 0x48", /* 0x48 */
"Reserved 0x49", /* 0x49 */
"Reserved 0x4a", /* 0x4a */
"Reserved 0x4b", /* 0x4b */
"Reserved 0x4c", /* 0x4c */
"Reserved 0x4d", /* 0x4d */
"Reserved 0x4e", /* 0x4e */
"Reserved 0x4f", /* 0x4f */
"Reserved 0x50", /* 0x50 */
"Reserved 0x51", /* 0x51 */
"Reserved 0x52", /* 0x52 */
"Reserved 0x53", /* 0x53 */
"Reserved 0x54", /* 0x54 */
"Reserved 0x55", /* 0x55 */
"Reserved 0x56", /* 0x56 */
"Reserved 0x57", /* 0x57 */
"Reserved 0x58", /* 0x58 */
"Reserved 0x59", /* 0x59 */
"Reserved 0x5a", /* 0x5a */
"Reserved 0x5b", /* 0x5b */
"Reserved 0x5c", /* 0x5c */
"Reserved 0x5d", /* 0x5d */
"Reserved 0x5e", /* 0x5e */
"Reserved 0x5f", /* 0x5f */
"Reserved 0x60", /* 0x60 */
"Reserved 0x61", /* 0x61 */
"Reserved 0x62", /* 0x62 */
"Reserved 0x63", /* 0x63 */
"Reserved 0x64", /* 0x64 */
"Reserved 0x65", /* 0x65 */
"Reserved 0x66", /* 0x66 */
"Reserved 0x67", /* 0x67 */
"Reserved 0x68", /* 0x68 */
"Reserved 0x69", /* 0x69 */
"Reserved 0x6a", /* 0x6a */
"Reserved 0x6b", /* 0x6b */
"Reserved 0x6c", /* 0x6c */
"Reserved 0x6d", /* 0x6d */
"Reserved 0x6e", /* 0x6e */
"Reserved 0x6f", /* 0x6f */
"Reserved 0x70", /* 0x70 */
"Reserved 0x71", /* 0x71 */
"Reserved 0x72", /* 0x72 */
"Reserved 0x73", /* 0x73 */
"Reserved 0x74", /* 0x74 */
"Reserved 0x75", /* 0x75 */
"Reserved 0x76", /* 0x76 */
"Reserved 0x77", /* 0x77 */
"Reserved 0x78", /* 0x78 */
"Reserved 0x79", /* 0x79 */
"Reserved 0x7a", /* 0x7a */
"Reserved 0x7b", /* 0x7b */
"Reserved 0x7c", /* 0x7c */
"Reserved 0x7d", /* 0x7d */
"Header Termination 1 IE", /* 0x7e */
"Header Termination 2 IE" /* 0x7f */
};

/* Payload IE Group IDs from Table 7-15 of 802.15.4-2015 */
static const char *p_ie_names[] = {
"ESDU IE", /* 0x00 */
"MLME IE", /* 0x01 */
"Vendor Specific Nested IE", /* 0x02 */
"Multiplexed IE (802.15.9)", /* 0x03 */
"Omnibus Payload Group IE", /* 0x04 */
"IETF IE", /* 0x05 */
"Reserved 0x06", /* 0x06 */
"Reserved 0x07", /* 0x07 */
"Reserved 0x08", /* 0x08 */
"Reserved 0x09", /* 0x09 */
"Reserved 0x0a", /* 0x0a */
"Reserved 0x0b", /* 0x0b */
"Reserved 0x0c", /* 0x0c */
"Reserved 0x0d", /* 0x0d */
"Reserved 0x0e", /* 0x0e */
"List termination" /* 0x0f */
};

/* Sub-ID for short format from Table 7-16 of 802.15.4-2015 */
static const char *p_mlme_short_names[] = {
"Reserved for long format 0x0", /* 0x00 */
"Reserved for long format 0x1", /* 0x01 */
"Reserved for long format 0x2", /* 0x02 */
"Reserved for long format 0x3", /* 0x03 */
"Reserved for long format 0x4", /* 0x04 */
"Reserved for long format 0x5", /* 0x05 */
"Reserved for long format 0x6", /* 0x06 */
"Reserved for long format 0x7", /* 0x07 */
"Reserved for long format 0x8", /* 0x08 */
"Reserved for long format 0x9", /* 0x09 */
"Reserved for long format 0xa", /* 0x0a */
"Reserved for long format 0xb", /* 0x0b */
"Reserved for long format 0xc", /* 0x0c */
"Reserved for long format 0xd", /* 0x0d */
"Reserved for long format 0xe", /* 0x0e */
"Reserved for long format 0xf", /* 0x0f */
"Reserved 0x10", /* 0x10 */
"Reserved 0x11", /* 0x11 */
"Reserved 0x12", /* 0x12 */
"Reserved 0x13", /* 0x13 */
"Reserved 0x14", /* 0x14 */
"Reserved 0x15", /* 0x15 */
"Reserved 0x16", /* 0x16 */
"Reserved 0x17", /* 0x17 */
"Reserved 0x18", /* 0x18 */
"Reserved 0x19", /* 0x19 */
"TSCH Synchronization IE", /* 0x1a */
"TSCH Slotframe and Link IE", /* 0x1b */
"TSCH Timeslot IE", /* 0x1c */
"Hopping timing IE", /* 0x1d */
"Enhanced Beacon Filter IE", /* 0x1e */
"MAC Metrics IE", /* 0x1f */
"All MAC Metrics IE", /* 0x20 */
"Coexistence Specification IE", /* 0x21 */
"SUN Device Capabilities IE", /* 0x22 */
"SUN FSK Generic PHY IE", /* 0x23 */
"Mode Switch Parameter IE", /* 0x24 */
"PHY Parameter Change IE", /* 0x25 */
"O-QPSK PHY Mode IE", /* 0x26 */
"PCA Allocation IE", /* 0x27 */
"LECIM DSSS Operating Mode IE", /* 0x28 */
"LECIM FSK Operating Mode IE", /* 0x29 */
"Reserved 0x2a", /* 0x2a */
"TVWS PHY Operating Mode Description IE", /* 0x2b */
"TVWS Device Capabilities IE", /* 0x2c */
"TVWS Device Category IE", /* 0x2d */
"TVWS Device Identification IE", /* 0x2e */
"TVWS Device Location IE", /* 0x2f */
"TVWS Channel Information Query IE", /* 0x30 */
"TVWS Channel Information Source IE", /* 0x31 */
"CTM IE", /* 0x32 */
"Timestamp IE", /* 0x33 */
"Timestamp Difference IE", /* 0x34 */
"TMCTP Specification IE", /* 0x35 */
"RCC PHY Operating Mode IE", /* 0x36 */
"Reserved 0x37", /* 0x37 */
"Reserved 0x38", /* 0x38 */
"Reserved 0x39", /* 0x39 */
"Reserved 0x3a", /* 0x3a */
"Reserved 0x3b", /* 0x3b */
"Reserved 0x3c", /* 0x3c */
"Reserved 0x3d", /* 0x3d */
"Reserved 0x3e", /* 0x3e */
"Reserved 0x3f", /* 0x3f */
"Reserved 0x40", /* 0x40 */
"Reserved 0x41", /* 0x41 */
"Reserved 0x42", /* 0x42 */
"Reserved 0x43", /* 0x43 */
"Reserved 0x44", /* 0x44 */
"Reserved 0x45", /* 0x45 */
"Reserved 0x46", /* 0x46 */
"Reserved 0x47", /* 0x47 */
"Reserved 0x48", /* 0x48 */
"Reserved 0x49", /* 0x49 */
"Reserved 0x4a", /* 0x4a */
"Reserved 0x4b", /* 0x4b */
"Reserved 0x4c", /* 0x4c */
"Reserved 0x4d", /* 0x4d */
"Reserved 0x4e", /* 0x4e */
"Reserved 0x4f", /* 0x4f */
"Reserved 0x50", /* 0x50 */
"Reserved 0x51", /* 0x51 */
"Reserved 0x52", /* 0x52 */
"Reserved 0x53", /* 0x53 */
"Reserved 0x54", /* 0x54 */
"Reserved 0x55", /* 0x55 */
"Reserved 0x56", /* 0x56 */
"Reserved 0x57", /* 0x57 */
"Reserved 0x58", /* 0x58 */
"Reserved 0x59", /* 0x59 */
"Reserved 0x5a", /* 0x5a */
"Reserved 0x5b", /* 0x5b */
"Reserved 0x5c", /* 0x5c */
"Reserved 0x5d", /* 0x5d */
"Reserved 0x5e", /* 0x5e */
"Reserved 0x5f", /* 0x5f */
"Reserved 0x60", /* 0x60 */
"Reserved 0x61", /* 0x61 */
"Reserved 0x62", /* 0x62 */
"Reserved 0x63", /* 0x63 */
"Reserved 0x64", /* 0x64 */
"Reserved 0x65", /* 0x65 */
"Reserved 0x66", /* 0x66 */
"Reserved 0x67", /* 0x67 */
"Reserved 0x68", /* 0x68 */
"Reserved 0x69", /* 0x69 */
"Reserved 0x6a", /* 0x6a */
"Reserved 0x6b", /* 0x6b */
"Reserved 0x6c", /* 0x6c */
"Reserved 0x6d", /* 0x6d */
"Reserved 0x6e", /* 0x6e */
"Reserved 0x6f", /* 0x6f */
"Reserved 0x70", /* 0x70 */
"Reserved 0x71", /* 0x71 */
"Reserved 0x72", /* 0x72 */
"Reserved 0x73", /* 0x73 */
"Reserved 0x74", /* 0x74 */
"Reserved 0x75", /* 0x75 */
"Reserved 0x76", /* 0x76 */
"Reserved 0x77", /* 0x77 */
"Reserved 0x78", /* 0x78 */
"Reserved 0x79", /* 0x79 */
"Reserved 0x7a", /* 0x7a */
"Reserved 0x7b", /* 0x7b */
"Reserved 0x7c", /* 0x7c */
"Reserved 0x7d", /* 0x7d */
"Reserved 0x7e", /* 0x7e */
"Reserved 0x7f" /* 0x7f */
};

/* Sub-ID for long format from Table 7-17 of 802.15.4-2015 */
static const char *p_mlme_long_names[] = {
"Reserved 0x00", /* 0x00 */
"Reserved 0x01", /* 0x01 */
"Reserved 0x02", /* 0x02 */
"Reserved 0x03", /* 0x03 */
"Reserved 0x04", /* 0x04 */
"Reserved 0x05", /* 0x05 */
"Reserved 0x06", /* 0x06 */
"Reserved 0x07", /* 0x07 */
"Vendor Specific MLME Nested IE", /* 0x08 */
"Channel Hopping IE", /* 0x09 */
"Reserved 0x0a", /* 0x0a */
"Reserved 0x0b", /* 0x0b */
"Reserved 0x0c", /* 0x0c */
"Reserved 0x0d", /* 0x0d */
"Reserved 0x0e", /* 0x0e */
"Reserved 0x0f" /* 0x0f */
};

/* MAC commands from Table 7-49 of 802.15.4-2015 */
static const char *mac_c_names[] = {
"Reserved 0x00", /* 0x00 */
"Association Request command", /* 0x01 */
"Association Response command", /* 0x02 */
"Disassociation Notification command", /* 0x03 */
"Data Request command", /* 0x04 */
"PAN ID Conflict Notification command", /* 0x05 */
"Orphan Notification command", /* 0x06 */
"Beacon Request command", /* 0x07 */
"Coordinator realignment command", /* 0x08 */
"GTS request command", /* 0x09 */
"TRLE Management Request command", /* 0x0a */
"TRLE Management Response command", /* 0x0b */
"Reserved 0x0c", /* 0x0c */
"Reserved 0x0d", /* 0x0d */
"Reserved 0x0e", /* 0x0e */
"Reserved 0x0f", /* 0x0f */
"Reserved 0x10", /* 0x10 */
"Reserved 0x11", /* 0x11 */
"Reserved 0x12", /* 0x12 */
"DSME Association Request command", /* 0x13 */
"DSME Association Response command", /* 0x14 */
"DSME GTS Request command", /* 0x15 */
"DSME GTS Response command", /* 0x16 */
"DSME GTS Notify command", /* 0x17 */
"DSME Information Request command", /* 0x18 */
"DSME Information Response command", /* 0x19 */
"DSME Beacon Allocation Notification command", /* 0x1a */
"DSME Beacon Collision Notification command", /* 0x1b */
"DSME Link Report command", /* 0x1c */
"Reserved 0x1d", /* 0x1d */
"Reserved 0x1e", /* 0x1e */
"Reserved 0x1f", /* 0x1f */
"RIT Data Request command", /* 0x20 */
"DBS Request command", /* 0x21 */
"DBS Response command", /* 0x22 */
"RIT Data Response command", /* 0x23 */
"Vendor Specific command", /* 0x24 */
"Reserved 0x25", /* 0x25 */
"Reserved 0x26", /* 0x26 */
"Reserved 0x27", /* 0x27 */
"Reserved 0x28", /* 0x28 */
"Reserved 0x29", /* 0x29 */
"Reserved 0x2a", /* 0x2a */
"Reserved 0x2b", /* 0x2b */
"Reserved 0x2c", /* 0x2c */
"Reserved 0x2d", /* 0x2d */
"Reserved 0x2e", /* 0x2e */
"Reserved 0x2f" /* 0x2f */
};

/*
* Frame Control subfields.
*/
#define FC_FRAME_TYPE(fc) ((fc) & 0x7)
#define FC_FRAME_VERSION(fc) (((fc) >> 12) & 0x3)

#define FC_ADDRESSING_MODE_NONE 0x00
#define FC_ADDRESSING_MODE_RESERVED 0x01
#define FC_ADDRESSING_MODE_SHORT 0x02
#define FC_ADDRESSING_MODE_LONG 0x03

/*
* IEEE 802.15.4 CRC 16 function. This is using the CCITT polynomial of 0x1021,
* but the initial value is 0, and the bits are reversed for both in and out.
* See section 7.2.10 of 802.15.4-2015 for more information.
*/
static uint16_t
ieee802_15_4_crc16(netdissect_options *ndo, const u_char *p,
u_int data_len)
{
uint16_t crc;
u_char x, y;

crc = 0x0000; /* Note, initial value is 0x0000 not 0xffff. */

while (data_len != 0){
y = GET_U_1(p);
p++;
/* Reverse bits on input */
y = (((y & 0xaa) >> 1) | ((y & 0x55) << 1));
y = (((y & 0xcc) >> 2) | ((y & 0x33) << 2));
y = (((y & 0xf0) >> 4) | ((y & 0x0f) << 4));
/* Update CRC */
x = crc >> 8 ^ y;
x ^= x >> 4;
crc = ((uint16_t)(crc << 8)) ^
((uint16_t)(x << 12)) ^
((uint16_t)(x << 5)) ^
((uint16_t)x);
data_len--;
}
/* Reverse bits on output */
crc = (((crc & 0xaaaa) >> 1) | ((crc & 0x5555) << 1));
crc = (((crc & 0xcccc) >> 2) | ((crc & 0x3333) << 2));
crc = (((crc & 0xf0f0) >> 4) | ((crc & 0x0f0f) << 4));
crc = (((crc & 0xff00) >> 8) | ((crc & 0x00ff) << 8));
return crc;
}

/*
* Reverses the bits of the 32-bit word.
*/
static uint32_t
ieee802_15_4_reverse32(uint32_t x)
{
x = ((x & 0x55555555) << 1) | ((x >> 1) & 0x55555555);
x = ((x & 0x33333333) << 2) | ((x >> 2) & 0x33333333);
x = ((x & 0x0F0F0F0F) << 4) | ((x >> 4) & 0x0F0F0F0F);
x = (x << 24) | ((x & 0xFF00) << 8) |
((x >> 8) & 0xFF00) | (x >> 24);
return x;
}

/*
* IEEE 802.15.4 CRC 32 function. This is using the ANSI X3.66-1979 polynomial of
* 0x04C11DB7, but the initial value is 0, and the bits are reversed for both
* in and out. See section 7.2.10 of 802.15.4-2015 for more information.
*/
static uint32_t
ieee802_15_4_crc32(netdissect_options *ndo, const u_char *p,
u_int data_len)
{
uint32_t crc, byte;
int b;

crc = 0x00000000; /* Note, initial value is 0x00000000 not 0xffffffff */

while (data_len != 0){
byte = GET_U_1(p);
p++;
/* Reverse bits on input */
byte = ieee802_15_4_reverse32(byte);
/* Update CRC */
for(b = 0; b <= 7; b++) {
if ((int) (crc ^ byte) < 0)
crc = (crc << 1) ^ 0x04C11DB7;
else
crc = crc << 1;
byte = byte << 1;
}
data_len--;
}
/* Reverse bits on output */
crc = ieee802_15_4_reverse32(crc);
return crc;
}

/*
* Find out the address length based on the address type. See table 7-3 of
* 802.15.4-2015. Returns the address length.
*/
static int
ieee802_15_4_addr_len(uint16_t addr_type)
{
switch (addr_type) {
case FC_ADDRESSING_MODE_NONE: /* None. */
return 0;
break;
case FC_ADDRESSING_MODE_RESERVED: /* Reserved, there used to be 8-bit
* address type in one amendment, but
* that and the feature using it was
* removed during 802.15.4-2015
* maintenance process. */
return -1;
break;
case FC_ADDRESSING_MODE_SHORT: /* Short. */
return 2;
break;
case FC_ADDRESSING_MODE_LONG: /* Extended. */
return 8;
break;
}
return 0;
}

/*
* Print out the ieee 802.15.4 address.
*/
static void
ieee802_15_4_print_addr(netdissect_options *ndo, const u_char *p,
int dst_addr_len)
{
switch (dst_addr_len) {
case 0:
ND_PRINT("none");
break;
case 2:
ND_PRINT("%04x", GET_LE_U_2(p));
break;
case 8:
ND_PRINT("%s", GET_LE64ADDR_STRING(p));
break;
}
}

/*
* Beacon frame superframe specification structure. Used in the old Beacon
* frames, and in the DSME PAN Descriptor IE. See section 7.3.1.3 of the
* 802.15.4-2015.
*/
static void
ieee802_15_4_print_superframe_specification(netdissect_options *ndo,
uint16_t ss)
{
if (ndo->ndo_vflag < 1) {
return;
}
ND_PRINT("\n\tBeacon order = %d, Superframe order = %d, ",
(ss & 0xf), ((ss >> 4) & 0xf));
ND_PRINT("Final CAP Slot = %d",
((ss >> 8) & 0xf));
if (CHECK_BIT(ss, 12)) { ND_PRINT(", BLE enabled"); }
if (CHECK_BIT(ss, 14)) { ND_PRINT(", PAN Coordinator"); }
if (CHECK_BIT(ss, 15)) { ND_PRINT(", Association Permit"); }
}

/*
* Beacon frame gts info structure. Used in the old Beacon frames, and
* in the DSME PAN Descriptor IE. See section 7.3.1.4 of 802.15.4-2015.
*
* Returns number of byts consumed from the packet or -1 in case of error.
*/
static int
ieee802_15_4_print_gts_info(netdissect_options *ndo,
const u_char *p,
u_int data_len)
{
uint8_t gts_spec, gts_cnt;
u_int len;
int i;

gts_spec = GET_U_1(p);
gts_cnt = gts_spec & 0x7;

if (gts_cnt == 0) {
if (ndo->ndo_vflag > 0) {
ND_PRINT("\n\tGTS Descriptor Count = %d, ", gts_cnt);
}
return 1;
}
len = 1 + 1 + gts_cnt * 3;

if (data_len < len) {
ND_PRINT(" [ERROR: Truncated GTS Info List]");
return -1;
}
if (ndo->ndo_vflag < 2) {
return len;
}
ND_PRINT("GTS Descriptor Count = %d, ", gts_cnt);
ND_PRINT("GTS Directions Mask = %02x, [ ",
GET_U_1(p + 1) & 0x7f);

for(i = 0; i < gts_cnt; i++) {
ND_PRINT("[ ");
ieee802_15_4_print_addr(ndo, p + 2 + i * 3, 2);
ND_PRINT(", Start slot = %d, Length = %d ] ",
GET_U_1(p + 2 + i * 3 + 1) & 0x0f,
(GET_U_1(p + 2 + i * 3 + 1) >> 4) & 0x0f);
}
ND_PRINT("]");
return len;
}

/*
* Beacon frame pending address structure. Used in the old Beacon frames, and
* in the DSME PAN Descriptor IE. See section 7.3.1.5 of 802.15.4-2015.
*
* Returns number of byts consumed from the packet or -1 in case of error.
*/
static int16_t
ieee802_15_4_print_pending_addresses(netdissect_options *ndo,
const u_char *p,
u_int data_len)
{
uint8_t pas, s_cnt, e_cnt, len, i;

pas = GET_U_1(p);
s_cnt = pas & 0x7;
e_cnt = (pas >> 4) & 0x7;
len = 1 + s_cnt * 2 + e_cnt * 8;
if (ndo->ndo_vflag > 0) {
ND_PRINT("\n\tPending address list, "
"# short addresses = %d, # extended addresses = %d",
s_cnt, e_cnt);
}
if (data_len < len) {
ND_PRINT(" [ERROR: Pending address list truncated]");
return -1;
}
if (ndo->ndo_vflag < 2) {
return len;
}
if (s_cnt != 0) {
ND_PRINT(", Short address list = [ ");
for(i = 0; i < s_cnt; i++) {
ieee802_15_4_print_addr(ndo, p + 1 + i * 2, 2);
ND_PRINT(" ");
}
ND_PRINT("]");
}
if (e_cnt != 0) {
ND_PRINT(", Extended address list = [ ");
for(i = 0; i < e_cnt; i++) {
ieee802_15_4_print_addr(ndo, p + 1 + s_cnt * 2 +
i * 8, 8);
ND_PRINT(" ");
}
ND_PRINT("]");
}
return len;
}

/*
* Print header ie content.
*/
static void
ieee802_15_4_print_header_ie(netdissect_options *ndo,
const u_char *p,
uint16_t ie_len,
int element_id)
{
int i;

switch (element_id) {
case 0x00: /* Vendor Specific Header IE */
if (ie_len < 3) {
ND_PRINT("[ERROR: Vendor OUI missing]");
} else {
ND_PRINT("OUI = 0x%02x%02x%02x, ", GET_U_1(p),
GET_U_1(p + 1), GET_U_1(p + 2));
ND_PRINT("Data = ");
for(i = 3; i < ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
}
break;
case 0x1a: /* LE CSL IE */
if (ie_len < 4) {
ND_PRINT("[ERROR: Truncated CSL IE]");
} else {
ND_PRINT("CSL Phase = %d, CSL Period = %d",
GET_LE_U_2(p), GET_LE_U_2(p + 2));
if (ie_len >= 6) {
ND_PRINT(", Rendezvous time = %d",
GET_LE_U_2(p + 4));
}
if (ie_len != 4 && ie_len != 6) {
ND_PRINT(" [ERROR: CSL IE length wrong]");
}
}
break;
case 0x1b: /* LE RIT IE */
if (ie_len < 4) {
ND_PRINT("[ERROR: Truncated RIT IE]");
} else {
ND_PRINT("Time to First Listen = %d, # of Repeat Listen = %d, Repeat Listen Interval = %d",
GET_U_1(p),
GET_U_1(p + 1),
GET_LE_U_2(p + 2));
}
break;
case 0x1c: /* DSME PAN Descriptor IE */
/*FALLTHROUGH*/
case 0x21: /* Extended DSME PAN descriptor IE */
if (ie_len < 2) {
ND_PRINT("[ERROR: Truncated DSME PAN IE]");
} else {
uint16_t ss, ptr, ulen;
int16_t len;
int hopping_present;

hopping_present = 0;

ss = GET_LE_U_2(p);
ieee802_15_4_print_superframe_specification(ndo, ss);
if (ie_len < 3) {
ND_PRINT("[ERROR: Truncated before pending addresses field]");
break;
}
ptr = 2;
len = ieee802_15_4_print_pending_addresses(ndo,
p + ptr,
ie_len -
ptr);
if (len < 0) {
break;
}
ptr += len;

if (element_id == 0x21) {
/* Extended version. */
if (ie_len < ptr + 2) {
ND_PRINT("[ERROR: Truncated before DSME Superframe Specification]");
break;
}
ss = GET_LE_U_2(p + ptr);
ptr += 2;
ND_PRINT("Multi-superframe Order = %d", ss & 0xff);
ND_PRINT(", %s", ((ss & 0x100) ?
"Channel hopping mode" :
"Channel adaptation mode"));
if (ss & 0x400) {
ND_PRINT(", CAP reduction enabled");
}
if (ss & 0x800) {
ND_PRINT(", Deferred beacon enabled");
}
if (ss & 0x1000) {
ND_PRINT(", Hopping Sequence Present");
hopping_present = 1;
}
} else {
if (ie_len < ptr + 1) {
ND_PRINT("[ERROR: Truncated before DSME Superframe Specification]");
break;
}
ss = GET_U_1(p + ptr);
ptr++;
ND_PRINT("Multi-superframe Order = %d",
ss & 0x0f);
ND_PRINT(", %s", ((ss & 0x10) ?
"Channel hopping mode" :
"Channel adaptation mode"));
if (ss & 0x40) {
ND_PRINT(", CAP reduction enabled");
}
if (ss & 0x80) {
ND_PRINT(", Deferred beacon enabled");
}
}
if (ie_len < ptr + 8) {
ND_PRINT(" [ERROR: Truncated before Time synchronization specification]");
break;
}
ND_PRINT("Beacon timestamp = %" PRIu64 ", offset = %d",
GET_LE_U_6(p + ptr),
GET_LE_U_2(p + ptr + 6));
ptr += 8;
if (ie_len < ptr + 4) {
ND_PRINT(" [ERROR: Truncated before Beacon Bitmap]");
break;
}

ulen = GET_LE_U_2(p + ptr + 2);
ND_PRINT("SD Index = %d, Bitmap len = %d, ",
GET_LE_U_2(p + ptr), ulen);
ptr += 4;
if (ie_len < ptr + ulen) {
ND_PRINT(" [ERROR: Truncated in SD bitmap]");
break;
}
ND_PRINT(" SD Bitmap = ");
for(i = 0; i < ulen; i++) {
ND_PRINT("%02x ", GET_U_1(p + ptr + i));
}
ptr += ulen;

if (ie_len < ptr + 5) {
ND_PRINT(" [ERROR: Truncated before Channel hopping specification]");
break;
}

ulen = GET_LE_U_2(p + ptr + 4);
ND_PRINT("Hopping Seq ID = %d, PAN Coordinator BSN = %d, "
"Channel offset = %d, Bitmap length = %d, ",
GET_U_1(p + ptr),
GET_U_1(p + ptr + 1),
GET_LE_U_2(p + ptr + 2),
ulen);
ptr += 5;
if (ie_len < ptr + ulen) {
ND_PRINT(" [ERROR: Truncated in Channel offset bitmap]");
break;
}
ND_PRINT(" Channel offset bitmap = ");
for(i = 0; i < ulen; i++) {
ND_PRINT("%02x ", GET_U_1(p + ptr + i));
}
ptr += ulen;
if (hopping_present) {
if (ie_len < ptr + 1) {
ND_PRINT(" [ERROR: Truncated in Hopping Sequence length]");
break;
}
ulen = GET_U_1(p + ptr);
ptr++;
ND_PRINT("Hopping Seq length = %d [ ", ulen);

/* The specification is not clear how the
hopping sequence is encoded, I assume two
octet unsigned integers for each channel. */

if (ie_len < ptr + ulen * 2) {
ND_PRINT(" [ERROR: Truncated in Channel offset bitmap]");
break;
}
for(i = 0; i < ulen; i++) {
ND_PRINT("%02x ",
GET_LE_U_2(p + ptr + i * 2));
}
ND_PRINT("]");
ptr += ulen * 2;
}
}
break;
case 0x1d: /* Rendezvous Tome IE */
if (ie_len != 4) {
ND_PRINT("[ERROR: Length != 2]");
} else {
uint16_t r_time, w_u_interval;
r_time = GET_LE_U_2(p);
w_u_interval = GET_LE_U_2(p + 2);

ND_PRINT("Rendezvous time = %d, Wake-up Interval = %d",
r_time, w_u_interval);
}
break;
case 0x1e: /* Time correction IE */
if (ie_len != 2) {
ND_PRINT("[ERROR: Length != 2]");
} else {
uint16_t val;
int16_t timecorr;

val = GET_LE_U_2(p);
if (val & 0x8000) { ND_PRINT("Negative "); }
val &= 0xfff;
val <<= 4;
timecorr = val;
timecorr >>= 4;

ND_PRINT("Ack time correction = %d, ", timecorr);
}
break;
case 0x22: /* Fragment Sequence Content Description IE */
/* XXX Not implemented */
case 0x23: /* Simplified Superframe Specification IE */
/* XXX Not implemented */
case 0x24: /* Simplified GTS Specification IE */
/* XXX Not implemented */
case 0x25: /* LECIM Capabilities IE */
/* XXX Not implemented */
case 0x26: /* TRLE Descriptor IE */
/* XXX Not implemented */
case 0x27: /* RCC Capabilities IE */
/* XXX Not implemented */
case 0x28: /* RCCN Descriptor IE */
/* XXX Not implemented */
case 0x29: /* Global Time IE */
/* XXX Not implemented */
case 0x2b: /* DA IE */
/* XXX Not implemented */
default:
ND_PRINT("IE Data = ");
for(i = 0; i < ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
break;
}
}

/*
* Parse and print Header IE list. See 7.4.2 of 802.15.4-2015 for
* more information.
*
* Returns number of byts consumed from the packet or -1 in case of error.
*/
static int
ieee802_15_4_print_header_ie_list(netdissect_options *ndo,
const u_char *p,
u_int caplen,
int *payload_ie_present)
{
int len, ie, element_id, i;
uint16_t ie_len;

*payload_ie_present = 0;
len = 0;
do {
if (caplen < 2) {
ND_PRINT("[ERROR: Truncated header IE]");
return -1;
}
/* Extract IE Header */
ie = GET_LE_U_2(p);
if (CHECK_BIT(ie, 15)) {
ND_PRINT("[ERROR: Header IE with type 1] ");
}
/* Get length and Element ID */
ie_len = ie & 0x7f;
element_id = (ie >> 7) & 0xff;
if (element_id > 127) {
ND_PRINT("Reserved Element ID %02x, length = %d ",
element_id, ie_len);
} else {
if (ie_len == 0) {
ND_PRINT("\n\t%s [", h_ie_names[element_id]);
} else {
ND_PRINT("\n\t%s [ length = %d, ",
h_ie_names[element_id], ie_len);
}
}
if (caplen < 2U + ie_len) {
ND_PRINT("[ERROR: Truncated IE data]");
return -1;
}
/* Skip header */
p += 2;

/* Parse and print content. */
if (ndo->ndo_vflag > 3 && ie_len != 0) {
ieee802_15_4_print_header_ie(ndo, p,
ie_len, element_id);
} else {
if (ie_len != 0) {
ND_PRINT("IE Data = ");
for(i = 0; i < ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
}
}
ND_PRINT("] ");
len += 2 + ie_len;
p += ie_len;
caplen -= 2 + ie_len;
if (element_id == 0x7e) {
*payload_ie_present = 1;
break;
}
if (element_id == 0x7f) {
break;
}
} while (caplen != 0);
return len;
}

/*
* Print MLME ie content.
*/
static void
ieee802_15_4_print_mlme_ie(netdissect_options *ndo,
const u_char *p,
uint16_t sub_ie_len,
int sub_id)
{
int i, j;
uint16_t len;

/* Note, as there is no overlap with the long and short
MLME sub IDs, we can just use one switch here. */
switch (sub_id) {
case 0x08: /* Vendor Specific Nested IE */
if (sub_ie_len < 3) {
ND_PRINT("[ERROR: Vendor OUI missing]");
} else {
ND_PRINT("OUI = 0x%02x%02x%02x, ",
GET_U_1(p),
GET_U_1(p + 1),
GET_U_1(p + 2));
ND_PRINT("Data = ");
for(i = 3; i < sub_ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
}
break;
case 0x09: /* Channel Hopping IE */
if (sub_ie_len < 1) {
ND_PRINT("[ERROR: Hopping sequence ID missing]");
} else if (sub_ie_len == 1) {
ND_PRINT("Hopping Sequence ID = %d", GET_U_1(p));
p++;
sub_ie_len--;
} else {
uint16_t channel_page, number_of_channels;

ND_PRINT("Hopping Sequence ID = %d", GET_U_1(p));
p++;
sub_ie_len--;
if (sub_ie_len < 7) {
ND_PRINT("[ERROR: IE truncated]");
break;
}
channel_page = GET_U_1(p);
number_of_channels = GET_LE_U_2(p + 1);
ND_PRINT("Channel Page = %d, Number of Channels = %d, ",
channel_page, number_of_channels);
ND_PRINT("Phy Configuration = 0x%08x, ",
GET_LE_U_4(p + 3));
p += 7;
sub_ie_len -= 7;
if (channel_page == 9 || channel_page == 10) {
len = (number_of_channels + 7) / 8;
if (sub_ie_len < len) {
ND_PRINT("[ERROR: IE truncated]");
break;
}
ND_PRINT("Extended bitmap = 0x");
for(i = 0; i < len; i++) {
ND_PRINT("%02x", GET_U_1(p + i));
}
ND_PRINT(", ");
p += len;
sub_ie_len -= len;
}
if (sub_ie_len < 2) {
ND_PRINT("[ERROR: IE truncated]");
break;
}
len = GET_LE_U_2(p);
p += 2;
sub_ie_len -= 2;
ND_PRINT("Hopping Seq length = %d [ ", len);

if (sub_ie_len < len * 2) {
ND_PRINT(" [ERROR: IE truncated]");
break;
}
for(i = 0; i < len; i++) {
ND_PRINT("%02x ", GET_LE_U_2(p + i * 2));
}
ND_PRINT("]");
p += len * 2;
sub_ie_len -= len * 2;
if (sub_ie_len < 2) {
ND_PRINT("[ERROR: IE truncated]");
break;
}
ND_PRINT("Current hop = %d", GET_LE_U_2(p));
}

break;
case 0x1a: /* TSCH Synchronization IE. */
if (sub_ie_len < 6) {
ND_PRINT("[ERROR: Length != 6]");
}
ND_PRINT("ASN = %010" PRIx64 ", Join Metric = %d ",
GET_LE_U_5(p), GET_U_1(p + 5));
break;
case 0x1b: /* TSCH Slotframe and Link IE. */
{
int sf_num, off, links, opts;

if (sub_ie_len < 1) {
ND_PRINT("[ERROR: Truncated IE]");
break;
}
sf_num = GET_U_1(p);
ND_PRINT("Slotframes = %d ", sf_num);
off = 1;
for(i = 0; i < sf_num; i++) {
if (sub_ie_len < off + 4) {
ND_PRINT("[ERROR: Truncated IE before slotframes]");
break;
}
links = GET_U_1(p + off + 3);
ND_PRINT("\n\t\t\t[ Handle %d, size = %d, links = %d ",
GET_U_1(p + off),
GET_LE_U_2(p + off + 1),
links);
off += 4;
for(j = 0; j < links; j++) {
if (sub_ie_len < off + 5) {
ND_PRINT("[ERROR: Truncated IE links]");
break;
}
opts = GET_U_1(p + off + 4);
ND_PRINT("\n\t\t\t\t[ Timeslot = %d, Offset = %d, Options = ",
GET_LE_U_2(p + off),
GET_LE_U_2(p + off + 2));
if (opts & 0x1) { ND_PRINT("TX "); }
if (opts & 0x2) { ND_PRINT("RX "); }
if (opts & 0x4) { ND_PRINT("Shared "); }
if (opts & 0x8) {
ND_PRINT("Timekeeping ");
}
if (opts & 0x10) {
ND_PRINT("Priority ");
}
off += 5;
ND_PRINT("] ");
}
ND_PRINT("] ");
}
}
break;
case 0x1c: /* TSCH Timeslot IE. */
if (sub_ie_len == 1) {
ND_PRINT("Time slot ID = %d ", GET_U_1(p));
} else if (sub_ie_len == 25) {
ND_PRINT("Time slot ID = %d, CCA Offset = %d, CCA = %d, TX Offset = %d, RX Offset = %d, RX Ack Delay = %d, TX Ack Delay = %d, RX Wait = %d, Ack Wait = %d, RX TX = %d, Max Ack = %d, Max TX = %d, Time slot Length = %d ",
GET_U_1(p),
GET_LE_U_2(p + 1),
GET_LE_U_2(p + 3),
GET_LE_U_2(p + 5),
GET_LE_U_2(p + 7),
GET_LE_U_2(p + 9),
GET_LE_U_2(p + 11),
GET_LE_U_2(p + 13),
GET_LE_U_2(p + 15),
GET_LE_U_2(p + 17),
GET_LE_U_2(p + 19),
GET_LE_U_2(p + 21),
GET_LE_U_2(p + 23));
} else if (sub_ie_len == 27) {
ND_PRINT("Time slot ID = %d, CCA Offset = %d, CCA = %d, TX Offset = %d, RX Offset = %d, RX Ack Delay = %d, TX Ack Delay = %d, RX Wait = %d, Ack Wait = %d, RX TX = %d, Max Ack = %d, Max TX = %d, Time slot Length = %d ",
GET_U_1(p),
GET_LE_U_2(p + 1),
GET_LE_U_2(p + 3),
GET_LE_U_2(p + 5),
GET_LE_U_2(p + 7),
GET_LE_U_2(p + 9),
GET_LE_U_2(p + 11),
GET_LE_U_2(p + 13),
GET_LE_U_2(p + 15),
GET_LE_U_2(p + 17),
GET_LE_U_2(p + 19),
GET_LE_U_3(p + 21),
GET_LE_U_3(p + 24));
} else {
ND_PRINT("[ERROR: Length not 1, 25, or 27]");
ND_PRINT("\n\t\t\tIE Data = ");
for(i = 0; i < sub_ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
}
break;
case 0x1d: /* Hopping timing IE */
/* XXX Not implemented */
case 0x1e: /* Enhanced Beacon Filter IE */
/* XXX Not implemented */
case 0x1f: /* MAC Metrics IE */
/* XXX Not implemented */
case 0x20: /* All MAC Metrics IE */
/* XXX Not implemented */
case 0x21: /* Coexistence Specification IE */
/* XXX Not implemented */
case 0x22: /* SUN Device Capabilities IE */
/* XXX Not implemented */
case 0x23: /* SUN FSK Generic PHY IE */
/* XXX Not implemented */
case 0x24: /* Mode Switch Parameter IE */
/* XXX Not implemented */
case 0x25: /* PHY Parameter Change IE */
/* XXX Not implemented */
case 0x26: /* O-QPSK PHY Mode IE */
/* XXX Not implemented */
case 0x27: /* PCA Allocation IE */
/* XXX Not implemented */
case 0x28: /* LECIM DSSS Operating Mode IE */
/* XXX Not implemented */
case 0x29: /* LECIM FSK Operating Mode IE */
/* XXX Not implemented */
case 0x2b: /* TVWS PHY Operating Mode Description IE */
/* XXX Not implemented */
case 0x2c: /* TVWS Device Capabilities IE */
/* XXX Not implemented */
case 0x2d: /* TVWS Device Category IE */
/* XXX Not implemented */
case 0x2e: /* TVWS Device Identification IE */
/* XXX Not implemented */
case 0x2f: /* TVWS Device Location IE */
/* XXX Not implemented */
case 0x30: /* TVWS Channel Information Query IE */
/* XXX Not implemented */
case 0x31: /* TVWS Channel Information Source IE */
/* XXX Not implemented */
case 0x32: /* CTM IE */
/* XXX Not implemented */
case 0x33: /* Timestamp IE */
/* XXX Not implemented */
case 0x34: /* Timestamp Difference IE */
/* XXX Not implemented */
case 0x35: /* TMCTP Specification IE */
/* XXX Not implemented */
case 0x36: /* TCC PHY Operating Mode IE */
/* XXX Not implemented */
default:
ND_PRINT("IE Data = ");
for(i = 0; i < sub_ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
break;
}
}

/*
* MLME IE list parsing and printing. See 7.4.3.2 of 802.15.4-2015
* for more information.
*/
static void
ieee802_15_4_print_mlme_ie_list(netdissect_options *ndo,
const u_char *p,
uint16_t ie_len)
{
int ie, sub_id, i, type;
uint16_t sub_ie_len;

do {
if (ie_len < 2) {
ND_PRINT("[ERROR: Truncated MLME IE]");
return;
}
/* Extract IE header */
ie = GET_LE_U_2(p);
type = CHECK_BIT(ie, 15);
if (type) {
/* Long type */
sub_ie_len = ie & 0x3ff;
sub_id = (ie >> 11) & 0x0f;
} else {
sub_ie_len = ie & 0xff;
sub_id = (ie >> 8) & 0x7f;
}

/* Skip the IE header */
p += 2;

if (type == 0) {
ND_PRINT("\n\t\t%s [ length = %d, ",
p_mlme_short_names[sub_id], sub_ie_len);
} else {
ND_PRINT("\n\t\t%s [ length = %d, ",
p_mlme_long_names[sub_id], sub_ie_len);
}

if (ie_len < 2 + sub_ie_len) {
ND_PRINT("[ERROR: Truncated IE data]");
return;
}
if (sub_ie_len != 0) {
if (ndo->ndo_vflag > 3) {
ieee802_15_4_print_mlme_ie(ndo, p, sub_ie_len, sub_id);
} else if (ndo->ndo_vflag > 2) {
ND_PRINT("IE Data = ");
for(i = 0; i < sub_ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
}
}
ND_PRINT("] ");
p += sub_ie_len;
ie_len -= 2 + sub_ie_len;
} while (ie_len != 0);
}

/*
* Multiplexed IE (802.15.9) parsing and printing.
*
* Returns number of bytes consumed from packet or -1 in case of error.
*/
static void
ieee802_15_4_print_mpx_ie(netdissect_options *ndo,
const u_char *p,
uint16_t ie_len)
{
int transfer_type, tid;
int fragment_number, data_start;
int i;

data_start = 0;
if (ie_len < 1) {
ND_PRINT("[ERROR: Transaction control byte missing]");
return;
}

transfer_type = GET_U_1(p) & 0x7;
tid = GET_U_1(p) >> 3;
switch (transfer_type) {
case 0x00: /* Full upper layer frame. */
case 0x01: /* Full upper layer frame with small Multiplex ID. */
ND_PRINT("Type = Full upper layer fragment%s, ",
(transfer_type == 0x01 ?
" with small Multiplex ID" : ""));
if (transfer_type == 0x00) {
if (ie_len < 3) {
ND_PRINT("[ERROR: Multiplex ID missing]");
return;
}
data_start = 3;
ND_PRINT("tid = 0x%02x, Multiplex ID = 0x%04x, ",
tid, GET_LE_U_2(p + 1));
} else {
data_start = 1;
ND_PRINT("Multiplex ID = 0x%04x, ", tid);
}
break;
case 0x02: /* First, or middle, Fragments */
case 0x04: /* Last fragment */
if (ie_len < 2) {
ND_PRINT("[ERROR: fragment number missing]");
return;
}

fragment_number = GET_U_1(p + 1);
ND_PRINT("Type = %s, tid = 0x%02x, fragment = 0x%02x, ",
(transfer_type == 0x02 ?
(fragment_number == 0 ?
"First fragment" : "Middle fragment") :
"Last fragment"), tid,
fragment_number);
data_start = 2;
if (fragment_number == 0) {
int total_size, multiplex_id;

if (ie_len < 6) {
ND_PRINT("[ERROR: Total upper layer size or multiplex ID missing]");
return;
}
total_size = GET_LE_U_2(p + 2);
multiplex_id = GET_LE_U_2(p + 4);
ND_PRINT("Total upper layer size = 0x%04x, Multiplex ID = 0x%04x, ",
total_size, multiplex_id);
data_start = 6;
}
break;
case 0x06: /* Abort code */
if (ie_len == 1) {
ND_PRINT("Type = Abort, tid = 0x%02x, no max size given",
tid);
} else if (ie_len == 3) {
ND_PRINT("Type = Abort, tid = 0x%02x, max size = 0x%04x",
tid, GET_LE_U_2(p + 1));
} else {
ND_PRINT("Type = Abort, tid = 0x%02x, invalid length = %d (not 1 or 3)",
tid, ie_len);
ND_PRINT("Abort data = ");
for(i = 1; i < ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
}
return;
/* NOTREACHED */
break;
case 0x03: /* Reserved */
case 0x05: /* Reserved */
case 0x07: /* Reserved */
ND_PRINT("Type = %d (Reserved), tid = 0x%02x, ",
transfer_type, tid);
data_start = 1;
break;
}

ND_PRINT("Upper layer data = ");
for(i = data_start; i < ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
}

/*
* Payload IE list parsing and printing. See 7.4.3 of 802.15.4-2015
* for more information.
*
* Returns number of byts consumed from the packet or -1 in case of error.
*/
static int
ieee802_15_4_print_payload_ie_list(netdissect_options *ndo,
const u_char *p,
u_int caplen)
{
int len, ie, group_id, i;
uint16_t ie_len;

len = 0;
do {
if (caplen < 2) {
ND_PRINT("[ERROR: Truncated header IE]");
return -1;
}
/* Extract IE header */
ie = GET_LE_U_2(p);
if ((CHECK_BIT(ie, 15)) == 0) {
ND_PRINT("[ERROR: Payload IE with type 0] ");
}
ie_len = ie & 0x3ff;
group_id = (ie >> 11) & 0x0f;

/* Skip the IE header */
p += 2;
if (ie_len == 0) {
ND_PRINT("\n\t%s [", p_ie_names[group_id]);
} else {
ND_PRINT("\n\t%s [ length = %d, ",
p_ie_names[group_id], ie_len);
}
if (caplen < 2U + ie_len) {
ND_PRINT("[ERROR: Truncated IE data]");
return -1;
}
if (ndo->ndo_vflag > 3 && ie_len != 0) {
switch (group_id) {
case 0x1: /* MLME IE */
ieee802_15_4_print_mlme_ie_list(ndo, p, ie_len);
break;
case 0x2: /* Vendor Specific Nested IE */
if (ie_len < 3) {
ND_PRINT("[ERROR: Vendor OUI missing]");
} else {
ND_PRINT("OUI = 0x%02x%02x%02x, ",
GET_U_1(p),
GET_U_1(p + 1),
GET_U_1(p + 2));
ND_PRINT("Data = ");
for(i = 3; i < ie_len; i++) {
ND_PRINT("%02x ",
GET_U_1(p + i));
}
}
break;
case 0x3: /* Multiplexed IE (802.15.9) */
ieee802_15_4_print_mpx_ie(ndo, p, ie_len);
break;
case 0x5: /* IETF IE */
if (ie_len < 1) {
ND_PRINT("[ERROR: Subtype ID missing]");
} else {
ND_PRINT("Subtype ID = 0x%02x, Subtype content = ",
GET_U_1(p));
for(i = 1; i < ie_len; i++) {
ND_PRINT("%02x ",
GET_U_1(p + i));
}
}
break;
default:
ND_PRINT("IE Data = ");
for(i = 0; i < ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
break;
}
} else {
if (ie_len != 0) {
ND_PRINT("IE Data = ");
for(i = 0; i < ie_len; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
}
}
ND_PRINT("]\n\t");
len += 2 + ie_len;
p += ie_len;
caplen -= 2 + ie_len;
if (group_id == 0xf) {
break;
}
} while (caplen != 0);
return len;
}

/*
* Parse and print auxiliary security header.
*
* Returns number of byts consumed from the packet or -1 in case of error.
*/
static int
ieee802_15_4_print_aux_sec_header(netdissect_options *ndo,
const u_char *p,
u_int caplen,
int *security_level)
{
int sc, key_id_mode, len;

if (caplen < 1) {
ND_PRINT("[ERROR: Truncated before Aux Security Header]");
return -1;
}
sc = GET_U_1(p);
len = 1;
*security_level = sc & 0x7;
key_id_mode = (sc >> 3) & 0x3;

caplen -= 1;
p += 1;

if (ndo->ndo_vflag > 0) {
ND_PRINT("\n\tSecurity Level %d, Key Id Mode %d, ",
*security_level, key_id_mode);
}
if ((CHECK_BIT(sc, 5)) == 0) {
if (caplen < 4) {
ND_PRINT("[ERROR: Truncated before Frame Counter]");
return -1;
}
if (ndo->ndo_vflag > 1) {
ND_PRINT("Frame Counter 0x%08x ",
GET_LE_U_4(p));
}
p += 4;
caplen -= 4;
len += 4;
}
switch (key_id_mode) {
case 0x00: /* Implicit. */
if (ndo->ndo_vflag > 1) {
ND_PRINT("Implicit");
}
return len;
break;
case 0x01: /* Key Index, nothing to print here. */
break;
case 0x02: /* PAN and Short address Key Source, and Key Index. */
if (caplen < 4) {
ND_PRINT("[ERROR: Truncated before Key Source]");
return -1;
}
if (ndo->ndo_vflag > 1) {
ND_PRINT("KeySource 0x%04x:%0x4x, ",
GET_LE_U_2(p), GET_LE_U_2(p + 2));
}
p += 4;
caplen -= 4;
len += 4;
break;
case 0x03: /* Extended address and Key Index. */
if (caplen < 8) {
ND_PRINT("[ERROR: Truncated before Key Source]");
return -1;
}
if (ndo->ndo_vflag > 1) {
ND_PRINT("KeySource %s, ", GET_LE64ADDR_STRING(p));
}
p += 4;
caplen -= 4;
len += 4;
break;
}
if (caplen < 1) {
ND_PRINT("[ERROR: Truncated before Key Index]");
return -1;
}
if (ndo->ndo_vflag > 1) {
ND_PRINT("KeyIndex 0x%02x, ", GET_U_1(p));
}
caplen -= 1;
p += 1;
len += 1;
return len;
}

/*
* Print command data.
*
* Returns number of byts consumed from the packet or -1 in case of error.
*/
static int
ieee802_15_4_print_command_data(netdissect_options *ndo,
uint8_t command_id,
const u_char *p,
u_int caplen)
{
u_int i;

switch (command_id) {
case 0x01: /* Association Request */
if (caplen != 1) {
ND_PRINT("Invalid Association request command length");
return -1;
} else {
uint8_t cap_info;
cap_info = GET_U_1(p);
ND_PRINT("%s%s%s%s%s%s",
((cap_info & 0x02) ?
"FFD, " : "RFD, "),
((cap_info & 0x04) ?
"AC powered, " : ""),
((cap_info & 0x08) ?
"Receiver on when idle, " : ""),
((cap_info & 0x10) ?
"Fast association, " : ""),
((cap_info & 0x40) ?
"Security supported, " : ""),
((cap_info & 0x80) ?
"Allocate address, " : ""));
return caplen;
}
break;
case 0x02: /* Association Response */
if (caplen != 3) {
ND_PRINT("Invalid Association response command length");
return -1;
} else {
ND_PRINT("Short address = ");
ieee802_15_4_print_addr(ndo, p, 2);
switch (GET_U_1(p + 2)) {
case 0x00:
ND_PRINT(", Association successful");
break;
case 0x01:
ND_PRINT(", PAN at capacity");
break;
case 0x02:
ND_PRINT(", PAN access denied");
break;
case 0x03:
ND_PRINT(", Hooping sequence offset duplication");
break;
case 0x80:
ND_PRINT(", Fast association successful");
break;
default:
ND_PRINT(", Status = 0x%02x",
GET_U_1(p + 2));
break;
}
return caplen;
}
break;
case 0x03: /* Disassociation Notification command */
if (caplen != 1) {
ND_PRINT("Invalid Disassociation Notification command length");
return -1;
} else {
switch (GET_U_1(p)) {
case 0x00:
ND_PRINT("Reserved");
break;
case 0x01:
ND_PRINT("Reason = The coordinator wishes the device to leave PAN");
break;
case 0x02:
ND_PRINT("Reason = The device wishes to leave the PAN");
break;
default:
ND_PRINT("Reason = 0x%02x", GET_U_1(p + 2));
break;
}
return caplen;
}

/* Following ones do not have any data. */
case 0x04: /* Data Request command */
case 0x05: /* PAN ID Conflict Notification command */
case 0x06: /* Orphan Notification command */
case 0x07: /* Beacon Request command */
/* Should not have any data. */
return 0;
case 0x08: /* Coordinator Realignment command */
if (caplen < 7 || caplen > 8) {
ND_PRINT("Invalid Coordinator Realignment command length");
return -1;
} else {
uint16_t channel, page;

ND_PRINT("Pan ID = 0x%04x, Coordinator short address = ",
GET_LE_U_2(p));
ieee802_15_4_print_addr(ndo, p + 2, 2);
channel = GET_U_1(p + 4);

if (caplen == 8) {
page = GET_U_1(p + 7);
} else {
page = 0x80;
}
if (CHECK_BIT(page, 7)) {
/* No page present, instead we have msb of
channel in the page. */
channel |= (page & 0x7f) << 8;
ND_PRINT(", Channel Number = %d", channel);
} else {
ND_PRINT(", Channel Number = %d, page = %d",
channel, page);
}
ND_PRINT(", Short address = ");
ieee802_15_4_print_addr(ndo, p + 5, 2);
return caplen;
}
break;
case 0x09: /* GTS Request command */
if (caplen != 1) {
ND_PRINT("Invalid GTS Request command length");
return -1;
} else {
uint8_t gts;

gts = GET_U_1(p);
ND_PRINT("GTS Length = %d, %s, %s",
gts & 0xf,
(CHECK_BIT(gts, 4) ?
"Receive-only GTS" : "Transmit-only GTS"),
(CHECK_BIT(gts, 5) ?
"GTS allocation" : "GTS deallocations"));
return caplen;
}
break;
case 0x13: /* DSME Association Request command */
/* XXX Not implemented */
case 0x14: /* DSME Association Response command */
/* XXX Not implemented */
case 0x15: /* DSME GTS Request command */
/* XXX Not implemented */
case 0x16: /* DSME GTS Response command */
/* XXX Not implemented */
case 0x17: /* DSME GTS Notify command */
/* XXX Not implemented */
case 0x18: /* DSME Information Request command */
/* XXX Not implemented */
case 0x19: /* DSME Information Response command */
/* XXX Not implemented */
case 0x1a: /* DSME Beacon Allocation Notification command */
/* XXX Not implemented */
case 0x1b: /* DSME Beacon Collision Notification command */
/* XXX Not implemented */
case 0x1c: /* DSME Link Report command */
/* XXX Not implemented */
case 0x20: /* RIT Data Request command */
/* XXX Not implemented */
case 0x21: /* DBS Request command */
/* XXX Not implemented */
case 0x22: /* DBS Response command */
/* XXX Not implemented */
case 0x23: /* RIT Data Response command */
/* XXX Not implemented */
case 0x24: /* Vendor Specific command */
/* XXX Not implemented */
case 0x0a: /* TRLE Management Request command */
/* XXX Not implemented */
case 0x0b: /* TRLE Management Response command */
/* XXX Not implemented */
default:
ND_PRINT("Command Data = ");
for(i = 0; i < caplen; i++) {
ND_PRINT("%02x ", GET_U_1(p + i));
}
break;
}
return 0;
}

/*
* Parse and print frames following standard format.
*
* Returns FALSE in case of error.
*/
static u_int
ieee802_15_4_std_frames(netdissect_options *ndo,
const u_char *p, u_int caplen,
uint16_t fc)
{
int len, frame_version, pan_id_comp;
int frame_type;
int src_pan, dst_pan, src_addr_len, dst_addr_len;
int security_level;
u_int miclen = 0;
int payload_ie_present;
uint8_t seq;
uint32_t fcs, crc_check;
const u_char *mic_start = NULL;

payload_ie_present = 0;

crc_check = 0;
/* Assume 2 octet FCS, the FCS length depends on the PHY, and we do not
know about that. */
if (caplen < 4) {
/* Cannot have FCS, assume no FCS. */
fcs = 0;
} else {
/* Test for 4 octet FCS. */
fcs = GET_LE_U_4(p + caplen - 4);
crc_check = ieee802_15_4_crc32(ndo, p, caplen - 4);
if (crc_check == fcs) {
/* Remove FCS */
caplen -= 4;
} else {
/* Test for 2 octet FCS. */
fcs = GET_LE_U_2(p + caplen - 2);
crc_check = ieee802_15_4_crc16(ndo, p, caplen - 2);
if (crc_check == fcs) {
/* Remove FCS */
caplen -= 2;
} else {
/* Wrong FCS, FCS might not be included in the
captured frame, do not remove it. */
}
}
}

/* Frame version. */
frame_version = FC_FRAME_VERSION(fc);
frame_type = FC_FRAME_TYPE(fc);
ND_PRINT("v%d ", frame_version);

if (ndo->ndo_vflag > 2) {
if (CHECK_BIT(fc, 3)) { ND_PRINT("Security Enabled, "); }
if (CHECK_BIT(fc, 4)) { ND_PRINT("Frame Pending, "); }
if (CHECK_BIT(fc, 5)) { ND_PRINT("AR, "); }
if (CHECK_BIT(fc, 6)) { ND_PRINT("PAN ID Compression, "); }
if (CHECK_BIT(fc, 8)) { ND_PRINT("Sequence Number Suppression, "); }
if (CHECK_BIT(fc, 9)) { ND_PRINT("IE present, "); }
}

/* Check for the sequence number suppression. */
if (CHECK_BIT(fc, 8)) {
/* Sequence number is suppressed. */
if (frame_version < 2) {
/* Sequence number can only be suppressed for frame
version 2 or higher, this is invalid frame. */
ND_PRINT("[ERROR: Sequence number suppressed on frames where version < 2]");
}
if (ndo->ndo_vflag)
ND_PRINT("seq suppressed ");
if (caplen < 2) {
nd_print_trunc(ndo);
return 0;
}
p += 2;
caplen -= 2;
} else {
seq = GET_U_1(p + 2);
if (ndo->ndo_vflag)
ND_PRINT("seq %02x ", seq);
if (caplen < 3) {
nd_print_trunc(ndo);
return 0;
}
p += 3;
caplen -= 3;
}

/* See which parts of addresses we have. */
dst_addr_len = ieee802_15_4_addr_len((fc >> 10) & 0x3);
src_addr_len = ieee802_15_4_addr_len((fc >> 14) & 0x3);
if (src_addr_len < 0) {
ND_PRINT("[ERROR: Invalid src address mode]");
return 0;
}
if (dst_addr_len < 0) {
ND_PRINT("[ERROR: Invalid dst address mode]");
return 0;
}
src_pan = 0;
dst_pan = 0;
pan_id_comp = CHECK_BIT(fc, 6);

/* The PAN ID Compression rules are complicated. */

/* First check old versions, where the rules are simple. */
if (frame_version < 2) {
if (pan_id_comp) {
src_pan = 0;
dst_pan = 1;
if (dst_addr_len <= 0 || src_addr_len <= 0) {
/* Invalid frame, PAN ID Compression must be 0
if only one address in the frame. */
ND_PRINT("[ERROR: PAN ID Compression != 0, and only one address with frame version < 2]");
}
} else {
src_pan = 1;
dst_pan = 1;
}
if (dst_addr_len <= 0) {
dst_pan = 0;
}
if (src_addr_len <= 0) {
src_pan = 0;
}
} else {
/* Frame version 2 rules are more complicated, and they depend
on the address modes of the frame, generic rules are same,
but then there are some special cases. */
if (pan_id_comp) {
src_pan = 0;
dst_pan = 1;
} else {
src_pan = 1;
dst_pan = 1;
}
if (dst_addr_len <= 0) {
dst_pan = 0;
}
if (src_addr_len <= 0) {
src_pan = 0;
}
if (pan_id_comp) {
if (src_addr_len == 0 &&
dst_addr_len == 0) {
/* Both addresses are missing, but PAN ID
compression set, special case we have
destination PAN but no addresses. */
dst_pan = 1;
} else if ((src_addr_len == 0 &&
dst_addr_len > 0) ||
(src_addr_len > 0 &&
dst_addr_len == 0)) {
/* Only one address present, and PAN ID
compression is set, we do not have PAN id at
all. */
dst_pan = 0;
src_pan = 0;
} else if (src_addr_len == 8 &&
dst_addr_len == 8) {
/* Both addresses are Extended, and PAN ID
compression set, we do not have PAN ID at
all. */
dst_pan = 0;
src_pan = 0;
}
} else {
/* Special cases where PAN ID Compression is not set. */
if (src_addr_len == 8 &&
dst_addr_len == 8) {
/* Both addresses are Extended, and PAN ID
compression not set, we do have only one PAN
ID (destination). */
dst_pan = 1;
src_pan = 0;
}
#ifdef BROKEN_6TISCH_PAN_ID_COMPRESSION
if (src_addr_len == 8 &&
dst_addr_len == 2) {
/* Special case for the broken 6tisch
implementations. */
src_pan = 0;
}
#endif /* BROKEN_6TISCH_PAN_ID_COMPRESSION */
}
}

/* Print dst PAN and address. */
if (dst_pan) {
if (caplen < 2) {
ND_PRINT("[ERROR: Truncated before dst_pan]");
return 0;
}
ND_PRINT("%04x:", GET_LE_U_2(p));
p += 2;
caplen -= 2;
} else {
ND_PRINT("-:");
}
if (caplen < (u_int) dst_addr_len) {
ND_PRINT("[ERROR: Truncated before dst_addr]");
return 0;
}
ieee802_15_4_print_addr(ndo, p, dst_addr_len);
p += dst_addr_len;
caplen -= dst_addr_len;

ND_PRINT(" < ");

/* Print src PAN and address. */
if (src_pan) {
if (caplen < 2) {
ND_PRINT("[ERROR: Truncated before dst_pan]");
return 0;
}
ND_PRINT("%04x:", GET_LE_U_2(p));
p += 2;
caplen -= 2;
} else {
ND_PRINT("-:");
}
if (caplen < (u_int) src_addr_len) {
ND_PRINT("[ERROR: Truncated before dst_addr]");
return 0;
}
ieee802_15_4_print_addr(ndo, p, src_addr_len);
ND_PRINT(" ");
p += src_addr_len;
caplen -= src_addr_len;
if (CHECK_BIT(fc, 3)) {
/*
* XXX - if frame_version is 0, this is the 2003
* spec, and you don't have the auxiliary security
* header, you have a frame counter and key index
* for the AES-CTR and AES-CCM security suites but
* not for the AES-CBC-MAC security suite.
*/
len = ieee802_15_4_print_aux_sec_header(ndo, p, caplen,
&security_level);
if (len < 0) {
return 0;
}
ND_TCHECK_LEN(p, len);
p += len;
caplen -= len;
} else {
security_level = 0;
}

switch (security_level) {
case 0: /*FALLTHROUGH */
case 4:
miclen = 0;
break;
case 1: /*FALLTHROUGH */
case 5:
miclen = 4;
break;
case 2: /*FALLTHROUGH */
case 6:
miclen = 8;
break;
case 3: /*FALLTHROUGH */
case 7:
miclen = 16;
break;
}

/* Remove MIC */
if (miclen != 0) {
if (caplen < miclen) {
ND_PRINT("[ERROR: Truncated before MIC]");
return 0;
}
caplen -= miclen;
mic_start = p + caplen;
}

/* Parse Information elements if present */
if (CHECK_BIT(fc, 9)) {
/* Yes we have those. */
len = ieee802_15_4_print_header_ie_list(ndo, p, caplen,
&payload_ie_present);
if (len < 0) {
return 0;
}
p += len;
caplen -= len;
}

if (payload_ie_present) {
if (security_level >= 4) {
ND_PRINT("Payload IEs present, but encrypted, cannot print ");
} else {
len = ieee802_15_4_print_payload_ie_list(ndo, p, caplen);
if (len < 0) {
return 0;
}
p += len;
caplen -= len;
}
}

/* Print MIC */
if (ndo->ndo_vflag > 2 && miclen != 0) {
ND_PRINT("\n\tMIC ");

for (u_int micoffset = 0; micoffset < miclen; micoffset++) {
ND_PRINT("%02x", GET_U_1(mic_start + micoffset));
}
ND_PRINT(" ");
}

/* Print FCS */
if (ndo->ndo_vflag > 2) {
if (crc_check == fcs) {
ND_PRINT("FCS %x ", fcs);
} else {
ND_PRINT("wrong FCS %x vs %x (assume no FCS stored) ",
fcs, crc_check);
}
}

/* Payload print */
switch (frame_type) {
case 0x00: /* Beacon */
if (frame_version < 2) {
if (caplen < 2) {
ND_PRINT("[ERROR: Truncated before beacon information]");
break;
} else {
uint16_t ss;

ss = GET_LE_U_2(p);
ieee802_15_4_print_superframe_specification(ndo, ss);
p += 2;
caplen -= 2;

/* GTS */
if (caplen < 1) {
ND_PRINT("[ERROR: Truncated before GTS info]");
break;
}

len = ieee802_15_4_print_gts_info(ndo, p, caplen);
if (len < 0) {
break;
}

p += len;
caplen -= len;

/* Pending Addresses */
if (caplen < 1) {
ND_PRINT("[ERROR: Truncated before pending addresses]");
break;
}
len = ieee802_15_4_print_pending_addresses(ndo, p, caplen);
if (len < 0) {
break;
}
ND_TCHECK_LEN(p, len);
p += len;
caplen -= len;
}
}
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, caplen);

break;
case 0x01: /* Data */
case 0x02: /* Acknowledgement */
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, caplen);
break;
case 0x03: /* MAC Command */
if (caplen < 1) {
ND_PRINT("[ERROR: Truncated before Command ID]");
} else {
uint8_t command_id;

command_id = GET_U_1(p);
if (command_id >= 0x30) {
ND_PRINT("Command ID = Reserved 0x%02x ",
command_id);
} else {
ND_PRINT("Command ID = %s ",
mac_c_names[command_id]);
}
p++;
caplen--;
if (caplen != 0) {
len = ieee802_15_4_print_command_data(ndo, command_id, p, caplen);
if (len >= 0) {
p += len;
caplen -= len;
}
}
}
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, caplen);
break;
}
return 1;
}

/*
* Print and parse Multipurpose frames.
*
* Returns FALSE in case of error.
*/
static u_int
ieee802_15_4_mp_frame(netdissect_options *ndo,
const u_char *p, u_int caplen,
uint16_t fc)
{
int len, frame_version, pan_id_present;
int src_addr_len, dst_addr_len;
int security_level;
u_int miclen = 0;
int ie_present, payload_ie_present, security_enabled;
uint8_t seq;
uint32_t fcs, crc_check;
const u_char *mic_start = NULL;

pan_id_present = 0;
ie_present = 0;
payload_ie_present = 0;
security_enabled = 0;
crc_check = 0;

/* Assume 2 octet FCS, the FCS length depends on the PHY, and we do not
know about that. */
if (caplen < 3) {
/* Cannot have FCS, assume no FCS. */
fcs = 0;
} else {
if (caplen > 4) {
/* Test for 4 octet FCS. */
fcs = GET_LE_U_4(p + caplen - 4);
crc_check = ieee802_15_4_crc32(ndo, p, caplen - 4);
if (crc_check == fcs) {
/* Remove FCS */
caplen -= 4;
} else {
fcs = GET_LE_U_2(p + caplen - 2);
crc_check = ieee802_15_4_crc16(ndo, p, caplen - 2);
if (crc_check == fcs) {
/* Remove FCS */
caplen -= 2;
}
}
} else {
fcs = GET_LE_U_2(p + caplen - 2);
crc_check = ieee802_15_4_crc16(ndo, p, caplen - 2);
if (crc_check == fcs) {
/* Remove FCS */
caplen -= 2;
}
}
}

if (CHECK_BIT(fc, 3)) {
/* Long Frame Control */

/* Frame version. */
frame_version = FC_FRAME_VERSION(fc);
ND_PRINT("v%d ", frame_version);

pan_id_present = CHECK_BIT(fc, 8);
ie_present = CHECK_BIT(fc, 15);
security_enabled = CHECK_BIT(fc, 9);

if (ndo->ndo_vflag > 2) {
if (security_enabled) { ND_PRINT("Security Enabled, "); }
if (CHECK_BIT(fc, 11)) { ND_PRINT("Frame Pending, "); }
if (CHECK_BIT(fc, 14)) { ND_PRINT("AR, "); }
if (pan_id_present) { ND_PRINT("PAN ID Present, "); }
if (CHECK_BIT(fc, 10)) {
ND_PRINT("Sequence Number Suppression, ");
}
if (ie_present) { ND_PRINT("IE present, "); }
}

/* Check for the sequence number suppression. */
if (CHECK_BIT(fc, 10)) {
/* Sequence number is suppressed, but long version. */
if (caplen < 2) {
nd_print_trunc(ndo);
return 0;
}
p += 2;
caplen -= 2;
} else {
seq = GET_U_1(p + 2);
if (ndo->ndo_vflag)
ND_PRINT("seq %02x ", seq);
if (caplen < 3) {
nd_print_trunc(ndo);
return 0;
}
p += 3;
caplen -= 3;
}
} else {
/* Short format of header, but with seq no */
seq = GET_U_1(p + 1);
p += 2;
caplen -= 2;
if (ndo->ndo_vflag)
ND_PRINT("seq %02x ", seq);
}

/* See which parts of addresses we have. */
dst_addr_len = ieee802_15_4_addr_len((fc >> 4) & 0x3);
src_addr_len = ieee802_15_4_addr_len((fc >> 6) & 0x3);
if (src_addr_len < 0) {
ND_PRINT("[ERROR: Invalid src address mode]");
return 0;
}
if (dst_addr_len < 0) {
ND_PRINT("[ERROR: Invalid dst address mode]");
return 0;
}

/* Print dst PAN and address. */
if (pan_id_present) {
if (caplen < 2) {
ND_PRINT("[ERROR: Truncated before dst_pan]");
return 0;
}
ND_PRINT("%04x:", GET_LE_U_2(p));
p += 2;
caplen -= 2;
} else {
ND_PRINT("-:");
}
if (caplen < (u_int) dst_addr_len) {
ND_PRINT("[ERROR: Truncated before dst_addr]");
return 0;
}
ieee802_15_4_print_addr(ndo, p, dst_addr_len);
p += dst_addr_len;
caplen -= dst_addr_len;

ND_PRINT(" < ");

/* Print src PAN and address. */
ND_PRINT(" -:");
if (caplen < (u_int) src_addr_len) {
ND_PRINT("[ERROR: Truncated before dst_addr]");
return 0;
}
ieee802_15_4_print_addr(ndo, p, src_addr_len);
ND_PRINT(" ");
p += src_addr_len;
caplen -= src_addr_len;

if (security_enabled) {
len = ieee802_15_4_print_aux_sec_header(ndo, p, caplen,
&security_level);
if (len < 0) {
return 0;
}
ND_TCHECK_LEN(p, len);
p += len;
caplen -= len;
} else {
security_level = 0;
}

switch (security_level) {
case 0: /*FALLTHROUGH */
case 4:
miclen = 0;
break;
case 1: /*FALLTHROUGH */
case 5:
miclen = 4;
break;
case 2: /*FALLTHROUGH */
case 6:
miclen = 8;
break;
case 3: /*FALLTHROUGH */
case 7:
miclen = 16;
break;
}

/* Remove MIC */
if (miclen != 0) {
if (caplen < miclen) {
ND_PRINT("[ERROR: Truncated before MIC]");
return 0;
}
caplen -= miclen;
mic_start = p + caplen;
}

/* Parse Information elements if present */
if (ie_present) {
/* Yes we have those. */
len = ieee802_15_4_print_header_ie_list(ndo, p, caplen,
&payload_ie_present);
if (len < 0) {
return 0;
}
p += len;
caplen -= len;
}

if (payload_ie_present) {
if (security_level >= 4) {
ND_PRINT("Payload IEs present, but encrypted, cannot print ");
} else {
len = ieee802_15_4_print_payload_ie_list(ndo, p,
caplen);
if (len < 0) {
return 0;
}
p += len;
caplen -= len;
}
}

/* Print MIC */
if (ndo->ndo_vflag > 2 && miclen != 0) {
ND_PRINT("\n\tMIC ");

for (u_int micoffset = 0; micoffset < miclen; micoffset++) {
ND_PRINT("%02x", GET_U_1(mic_start + micoffset));
}
ND_PRINT(" ");
}

/* Print FCS */
if (ndo->ndo_vflag > 2) {
if (crc_check == fcs) {
ND_PRINT("FCS %x ", fcs);
} else {
ND_PRINT("wrong FCS %x vs %x (assume no FCS stored) ",
fcs, crc_check);
}
}

if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, caplen);

return 1;
}

/*
* Print frag frame.
*
* Returns FALSE in case of error.
*/
static u_int
ieee802_15_4_frag_frame(netdissect_options *ndo _U_,
const u_char *p _U_,
u_int caplen _U_,
uint16_t fc _U_)
{
/* Not implement yet, might be bit hard to implement, as the
* information to set up the fragment is coming in the previous frame
* in the Fragment Sequence Context Description IE, thus we need to
* store information from there, so we can use it here. */
return 0;
}

/*
* Internal call to dissector taking packet + len instead of pcap_pkthdr.
*
* Returns FALSE in case of error.
*/
u_int
ieee802_15_4_print(netdissect_options *ndo,
const u_char *p, u_int caplen)
{
int frame_type;
uint16_t fc;

ndo->ndo_protocol = "802.15.4";

if (caplen < 2) {
nd_print_trunc(ndo);
return caplen;
}

fc = GET_LE_U_2(p);

/* First we need to check the frame type to know how to parse the rest
of the FC. Frame type is the first 3 bit of the frame control field.
*/

frame_type = FC_FRAME_TYPE(fc);
ND_PRINT("IEEE 802.15.4 %s packet ", ftypes[frame_type]);

switch (frame_type) {
case 0x00: /* Beacon */
case 0x01: /* Data */
case 0x02: /* Acknowledgement */
case 0x03: /* MAC Command */
return ieee802_15_4_std_frames(ndo, p, caplen, fc);
break;
case 0x04: /* Reserved */
return 0;
break;
case 0x05: /* Multipurpose */
return ieee802_15_4_mp_frame(ndo, p, caplen, fc);
break;
case 0x06: /* Fragment or Frak */
return ieee802_15_4_frag_frame(ndo, p, caplen, fc);
break;
case 0x07: /* Extended */
return 0;
break;
}
return 0;
}

/*
* Main function to print packets.
*/

void
ieee802_15_4_if_print(netdissect_options *ndo,
const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
ndo->ndo_protocol = "802.15.4";
ndo->ndo_ll_hdr_len += ieee802_15_4_print(ndo, p, caplen);
}

/* For DLT_IEEE802_15_4_TAP */
/* https://github.com/jkcko/ieee802.15.4-tap */
void
ieee802_15_4_tap_if_print(netdissect_options *ndo,
const struct pcap_pkthdr *h, const u_char *p)
{
uint8_t version;
uint16_t length;

ndo->ndo_protocol = "802.15.4_tap";
if (h->caplen < 4) {
nd_print_trunc(ndo);
ndo->ndo_ll_hdr_len += h->caplen;
return;
}

version = GET_U_1(p);
length = GET_LE_U_2(p + 2);
if (version != 0 || length < 4) {
nd_print_invalid(ndo);
return;
}

if (h->caplen < length) {
nd_print_trunc(ndo);
ndo->ndo_ll_hdr_len += h->caplen;
return;
}

ndo->ndo_ll_hdr_len += ieee802_15_4_print(ndo, p+length, h->caplen-length) + length;
}