JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2009 |
| 3 | * Siemens AG, All rights reserved. |
| 4 | * Dmitry Eremin-Solenikov (dbaryshkov@gmail.com) |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that: (1) source code distributions |
| 8 | * retain the above copyright notice and this paragraph in its entirety, (2) |
| 9 | * distributions including binary code include the above copyright notice and |
| 10 | * this paragraph in its entirety in the documentation or other materials |
| 11 | * provided with the distribution, and (3) all advertising materials mentioning |
| 12 | * features or use of this software display the following acknowledgement: |
| 13 | * ``This product includes software developed by the University of California, |
| 14 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| 15 | * the University nor the names of its contributors may be used to endorse |
| 16 | * or promote products derived from this software without specific prior |
| 17 | * written permission. |
| 18 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| 19 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| 20 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 21 | */ |
| 22 | |
| 23 | #ifdef HAVE_CONFIG_H |
| 24 | #include "config.h" |
| 25 | #endif |
| 26 | |
| 27 | #include <tcpdump-stdinc.h> |
| 28 | |
| 29 | #include <stdio.h> |
| 30 | #include <pcap.h> |
| 31 | #include <string.h> |
| 32 | |
| 33 | #include "interface.h" |
| 34 | #include "addrtoname.h" |
| 35 | |
| 36 | #include "extract.h" |
| 37 | |
| 38 | static const char *ftypes[] = { |
| 39 | "Beacon", /* 0 */ |
| 40 | "Data", /* 1 */ |
| 41 | "ACK", /* 2 */ |
| 42 | "Command", /* 3 */ |
| 43 | "Reserved", /* 4 */ |
| 44 | "Reserved", /* 5 */ |
| 45 | "Reserved", /* 6 */ |
| 46 | "Reserved", /* 7 */ |
| 47 | }; |
| 48 | |
| 49 | static int |
| 50 | extract_header_length(u_int16_t fc) |
| 51 | { |
| 52 | int len = 0; |
| 53 | |
| 54 | switch ((fc >> 10) & 0x3) { |
| 55 | case 0x00: |
| 56 | if (fc & (1 << 6)) /* intra-PAN with none dest addr */ |
| 57 | return -1; |
| 58 | break; |
| 59 | case 0x01: |
| 60 | return -1; |
| 61 | case 0x02: |
| 62 | len += 4; |
| 63 | break; |
| 64 | case 0x03: |
| 65 | len += 10; |
| 66 | break; |
| 67 | } |
| 68 | |
| 69 | switch ((fc >> 14) & 0x3) { |
| 70 | case 0x00: |
| 71 | break; |
| 72 | case 0x01: |
| 73 | return -1; |
| 74 | case 0x02: |
| 75 | len += 4; |
| 76 | break; |
| 77 | case 0x03: |
| 78 | len += 10; |
| 79 | break; |
| 80 | } |
| 81 | |
| 82 | if (fc & (1 << 6)) { |
| 83 | if (len < 2) |
| 84 | return -1; |
| 85 | len -= 2; |
| 86 | } |
| 87 | |
| 88 | return len; |
| 89 | } |
| 90 | |
| 91 | |
| 92 | u_int |
| 93 | ieee802_15_4_if_print(struct netdissect_options *ndo, |
| 94 | const struct pcap_pkthdr *h, const u_char *p) |
| 95 | { |
| 96 | u_int caplen = h->caplen; |
| 97 | int hdrlen; |
| 98 | u_int16_t fc; |
| 99 | u_int8_t seq; |
| 100 | |
| 101 | if (caplen < 3) { |
| 102 | ND_PRINT((ndo, "[|802.15.4] %x", caplen)); |
| 103 | return caplen; |
| 104 | } |
| 105 | |
| 106 | fc = EXTRACT_LE_16BITS(p); |
| 107 | hdrlen = extract_header_length(fc); |
| 108 | |
| 109 | seq = EXTRACT_LE_8BITS(p + 2); |
| 110 | |
| 111 | p += 3; |
| 112 | caplen -= 3; |
| 113 | |
| 114 | ND_PRINT((ndo,"IEEE 802.15.4 %s packet ", ftypes[fc & 0x7])); |
| 115 | if (vflag) |
| 116 | ND_PRINT((ndo,"seq %02x ", seq)); |
| 117 | if (hdrlen == -1) { |
| 118 | ND_PRINT((ndo,"malformed! ")); |
| 119 | return caplen; |
| 120 | } |
| 121 | |
| 122 | |
| 123 | if (!vflag) { |
| 124 | p+= hdrlen; |
| 125 | caplen -= hdrlen; |
| 126 | } else { |
| 127 | u_int16_t panid = 0; |
| 128 | |
| 129 | switch ((fc >> 10) & 0x3) { |
| 130 | case 0x00: |
| 131 | ND_PRINT((ndo,"none ")); |
| 132 | break; |
| 133 | case 0x01: |
| 134 | ND_PRINT((ndo,"reserved destination addressing mode")); |
| 135 | return 0; |
| 136 | case 0x02: |
| 137 | panid = EXTRACT_LE_16BITS(p); |
| 138 | p += 2; |
| 139 | ND_PRINT((ndo,"%04x:%04x ", panid, EXTRACT_LE_16BITS(p))); |
| 140 | p += 2; |
| 141 | break; |
| 142 | case 0x03: |
| 143 | panid = EXTRACT_LE_16BITS(p); |
| 144 | p += 2; |
| 145 | ND_PRINT((ndo,"%04x:%s ", panid, le64addr_string(p))); |
| 146 | p += 8; |
| 147 | break; |
| 148 | } |
| 149 | ND_PRINT((ndo,"< "); |
| 150 | |
| 151 | switch ((fc >> 14) & 0x3) { |
| 152 | case 0x00: |
| 153 | ND_PRINT((ndo,"none ")); |
| 154 | break; |
| 155 | case 0x01: |
| 156 | ND_PRINT((ndo,"reserved source addressing mode")); |
| 157 | return 0; |
| 158 | case 0x02: |
| 159 | if (!(fc & (1 << 6))) { |
| 160 | panid = EXTRACT_LE_16BITS(p); |
| 161 | p += 2; |
| 162 | } |
| 163 | ND_PRINT((ndo,"%04x:%04x ", panid, EXTRACT_LE_16BITS(p))); |
| 164 | p += 2; |
| 165 | break; |
| 166 | case 0x03: |
| 167 | if (!(fc & (1 << 6))) { |
| 168 | panid = EXTRACT_LE_16BITS(p); |
| 169 | p += 2; |
| 170 | } |
| 171 | ND_PRINT((ndo,"%04x:%s ", panid, le64addr_string(p)))); |
| 172 | p += 8; |
| 173 | break; |
| 174 | } |
| 175 | |
| 176 | caplen -= hdrlen; |
| 177 | } |
| 178 | |
| 179 | if (!suppress_default_print) |
| 180 | (ndo->ndo_default_print)(ndo, p, caplen); |
| 181 | |
| 182 | return 0; |
| 183 | } |