/* * Copyright (c) 2009 * Siemens AG, All rights reserved. * Dmitry Eremin-Solenikov (dbaryshkov@gmail.com) * * 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. */ /* \summary: IEEE 802.15.4 printer */ #include #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; }