contrib/tcpdump/print-802_15_4.c

   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 #define NETDISSECT_REWORKED
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <tcpdump-stdinc.h>
  29
  30 #include "interface.h"
  31 #include "addrtoname.h"
  32
  33 #include "extract.h"
  34
  35 static const char *ftypes[] = {
  36         "Beacon",                       /* 0 */
  37         "Data",                         /* 1 */
  38         "ACK",                          /* 2 */
  39         "Command",                      /* 3 */
  40         "Reserved",                     /* 4 */
  41         "Reserved",                     /* 5 */
  42         "Reserved",                     /* 6 */
  43         "Reserved",                     /* 7 */
  44 };
  45
  46 static int
  47 extract_header_length(uint16_t fc)
  48 {
  49         int len = 0;
  50
  51         switch ((fc >> 10) & 0x3) {
  52         case 0x00:
  53                 if (fc & (1 << 6)) /* intra-PAN with none dest addr */
  54                         return -1;
  55                 break;
  56         case 0x01:
  57                 return -1;
  58         case 0x02:
  59                 len += 4;
  60                 break;
  61         case 0x03:
  62                 len += 10;
  63                 break;
  64         }
  65
  66         switch ((fc >> 14) & 0x3) {
  67         case 0x00:
  68                 break;
  69         case 0x01:
  70                 return -1;
  71         case 0x02:
  72                 len += 4;
  73                 break;
  74         case 0x03:
  75                 len += 10;
  76                 break;
  77         }
  78
  79         if (fc & (1 << 6)) {
  80                 if (len < 2)
  81                         return -1;
  82                 len -= 2;
  83         }
  84
  85         return len;
  86 }
  87
  88
  89 u_int
  90 ieee802_15_4_if_print(netdissect_options *ndo,
  91                       const struct pcap_pkthdr *h, const u_char *p)
  92 {
  93         u_int caplen = h->caplen;
  94         int hdrlen;
  95         uint16_t fc;
  96         uint8_t seq;
  97
  98         if (caplen < 3) {
  99                 ND_PRINT((ndo, "[|802.15.4] %x", caplen));
 100                 return caplen;
 101         }
 102
 103         fc = EXTRACT_LE_16BITS(p);
 104         hdrlen = extract_header_length(fc);
 105
 106         seq = EXTRACT_LE_8BITS(p + 2);
 107
 108         p += 3;
 109         caplen -= 3;
 110
 111         ND_PRINT((ndo,"IEEE 802.15.4 %s packet ", ftypes[fc & 0x7]));
 112         if (ndo->ndo_vflag)
 113                 ND_PRINT((ndo,"seq %02x ", seq));
 114         if (hdrlen == -1) {
 115                 ND_PRINT((ndo,"malformed! "));
 116                 return caplen;
 117         }
 118
 119
 120         if (!ndo->ndo_vflag) {
 121                 p+= hdrlen;
 122                 caplen -= hdrlen;
 123         } else {
 124                 uint16_t panid = 0;
 125
 126                 switch ((fc >> 10) & 0x3) {
 127                 case 0x00:
 128                         ND_PRINT((ndo,"none "));
 129                         break;
 130                 case 0x01:
 131                         ND_PRINT((ndo,"reserved destination addressing mode"));
 132                         return 0;
 133                 case 0x02:
 134                         panid = EXTRACT_LE_16BITS(p);
 135                         p += 2;
 136                         ND_PRINT((ndo,"%04x:%04x ", panid, EXTRACT_LE_16BITS(p)));
 137                         p += 2;
 138                         break;
 139                 case 0x03:
 140                         panid = EXTRACT_LE_16BITS(p);
 141                         p += 2;
 142                         ND_PRINT((ndo,"%04x:%s ", panid, le64addr_string(p)));
 143                         p += 8;
 144                         break;
 145                 }
 146                 ND_PRINT((ndo,"< "));
 147
 148                 switch ((fc >> 14) & 0x3) {
 149                 case 0x00:
 150                         ND_PRINT((ndo,"none "));
 151                         break;
 152                 case 0x01:
 153                         ND_PRINT((ndo,"reserved source addressing mode"));
 154                         return 0;
 155                 case 0x02:
 156                         if (!(fc & (1 << 6))) {
 157                                 panid = EXTRACT_LE_16BITS(p);
 158                                 p += 2;
 159                         }
 160                         ND_PRINT((ndo,"%04x:%04x ", panid, EXTRACT_LE_16BITS(p)));
 161                         p += 2;
 162                         break;
 163                 case 0x03:
 164                         if (!(fc & (1 << 6))) {
 165                                 panid = EXTRACT_LE_16BITS(p);
 166                                 p += 2;
 167                         }
 168                         ND_PRINT((ndo,"%04x:%s ", panid, le64addr_string(p)));
 169                         p += 8;
 170                         break;
 171                 }
 172
 173                 caplen -= hdrlen;
 174         }
 175
 176         if (!ndo->ndo_suppress_default_print)
 177                 ND_DEFAULTPRINT(p, caplen);
 178
 179         return 0;
 180 }