The Tcpdump Group git mirrors - tcpdump/blob - 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 /* \summary: IEEE 802.15.4 printer */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <netdissect-stdinc.h>
  30
  31 #include "netdissect.h"
  32 #include "addrtoname.h"
  33
  34 #include "extract.h"
  35
  36 static const char *ftypes[] = {
  37         "Beacon",                       /* 0 */
  38         "Data",                         /* 1 */
  39         "ACK",                          /* 2 */
  40         "Command",                      /* 3 */
  41         "Reserved",                     /* 4 */
  42         "Reserved",                     /* 5 */
  43         "Reserved",                     /* 6 */
  44         "Reserved",                     /* 7 */
  45 };
  46
  47 static int
  48 extract_header_length(uint16_t fc)
  49 {
  50         int len = 0;
  51
  52         switch ((fc >> 10) & 0x3) {
  53         case 0x00:
  54                 if (fc & (1 << 6)) /* intra-PAN with none dest addr */
  55                         return -1;
  56                 break;
  57         case 0x01:
  58                 return -1;
  59         case 0x02:
  60                 len += 4;
  61                 break;
  62         case 0x03:
  63                 len += 10;
  64                 break;
  65         }
  66
  67         switch ((fc >> 14) & 0x3) {
  68         case 0x00:
  69                 break;
  70         case 0x01:
  71                 return -1;
  72         case 0x02:
  73                 len += 4;
  74                 break;
  75         case 0x03:
  76                 len += 10;
  77                 break;
  78         }
  79
  80         if (fc & (1 << 6)) {
  81                 if (len < 2)
  82                         return -1;
  83                 len -= 2;
  84         }
  85
  86         return len;
  87 }
  88
  89
  90 u_int
  91 ieee802_15_4_if_print(netdissect_options *ndo,
  92                       const struct pcap_pkthdr *h, const u_char *p)
  93 {
  94         u_int caplen = h->caplen;
  95         int hdrlen;
  96         uint16_t fc;
  97         uint8_t seq;
  98
  99         if (caplen < 3) {
 100                 ND_PRINT((ndo, "[|802.15.4] %x", caplen));
 101                 return caplen;
 102         }
 103
 104         fc = EXTRACT_LE_16BITS(p);
 105         hdrlen = extract_header_length(fc);
 106
 107         seq = EXTRACT_LE_8BITS(p + 2);
 108
 109         p += 3;
 110         caplen -= 3;
 111
 112         ND_PRINT((ndo,"IEEE 802.15.4 %s packet ", ftypes[fc & 0x7]));
 113         if (ndo->ndo_vflag)
 114                 ND_PRINT((ndo,"seq %02x ", seq));
 115         if (hdrlen == -1) {
 116                 ND_PRINT((ndo,"invalid! "));
 117                 return caplen;
 118         }
 119
 120
 121         if (!ndo->ndo_vflag) {
 122                 p+= hdrlen;
 123                 caplen -= hdrlen;
 124         } else {
 125                 uint16_t panid = 0;
 126
 127                 switch ((fc >> 10) & 0x3) {
 128                 case 0x00:
 129                         ND_PRINT((ndo,"none "));
 130                         break;
 131                 case 0x01:
 132                         ND_PRINT((ndo,"reserved destination addressing mode"));
 133                         return 0;
 134                 case 0x02:
 135                         panid = EXTRACT_LE_16BITS(p);
 136                         p += 2;
 137                         ND_PRINT((ndo,"%04x:%04x ", panid, EXTRACT_LE_16BITS(p)));
 138                         p += 2;
 139                         break;
 140                 case 0x03:
 141                         panid = EXTRACT_LE_16BITS(p);
 142                         p += 2;
 143                         ND_PRINT((ndo,"%04x:%s ", panid, le64addr_string(ndo, p)));
 144                         p += 8;
 145                         break;
 146                 }
 147                 ND_PRINT((ndo,"< "));
 148
 149                 switch ((fc >> 14) & 0x3) {
 150                 case 0x00:
 151                         ND_PRINT((ndo,"none "));
 152                         break;
 153                 case 0x01:
 154                         ND_PRINT((ndo,"reserved source addressing mode"));
 155                         return 0;
 156                 case 0x02:
 157                         if (!(fc & (1 << 6))) {
 158                                 panid = EXTRACT_LE_16BITS(p);
 159                                 p += 2;
 160                         }
 161                         ND_PRINT((ndo,"%04x:%04x ", panid, EXTRACT_LE_16BITS(p)));
 162                         p += 2;
 163                         break;
 164                 case 0x03:
 165                         if (!(fc & (1 << 6))) {
 166                                 panid = EXTRACT_LE_16BITS(p);
 167                                 p += 2;
 168                         }
 169                         ND_PRINT((ndo,"%04x:%s ", panid, le64addr_string(ndo, p)));
 170                         p += 8;
 171                         break;
 172                 }
 173
 174                 caplen -= hdrlen;
 175         }
 176
 177         if (!ndo->ndo_suppress_default_print)
 178                 ND_DEFAULTPRINT(p, caplen);
 179
 180         return 0;
 181 }