1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /* |
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4 | * Copyright (c) 2009 |
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5 | * Siemens AG, All rights reserved. |
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6 | * Dmitry Eremin-Solenikov (dbaryshkov@gmail.com) |
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7 | * |
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8 | * Redistribution and use in source and binary forms, with or without |
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9 | * modification, are permitted provided that: (1) source code distributions |
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10 | * retain the above copyright notice and this paragraph in its entirety, (2) |
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11 | * distributions including binary code include the above copyright notice and |
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12 | * this paragraph in its entirety in the documentation or other materials |
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13 | * provided with the distribution, and (3) all advertising materials mentioning |
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14 | * features or use of this software display the following acknowledgement: |
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15 | * ``This product includes software developed by the University of California, |
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16 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
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17 | * the University nor the names of its contributors may be used to endorse |
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18 | * or promote products derived from this software without specific prior |
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19 | * written permission. |
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20 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
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21 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
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22 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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23 | */ |
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24 | |
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25 | #ifdef HAVE_CONFIG_H |
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26 | #include "config.h" |
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27 | #endif |
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28 | |
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29 | #include <tcpdump-stdinc.h> |
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30 | |
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31 | #include <stdio.h> |
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32 | #include <pcap.h> |
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33 | #include <string.h> |
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34 | |
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35 | #include "interface.h" |
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36 | #include "addrtoname.h" |
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37 | |
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38 | #include "extract.h" |
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39 | |
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40 | static const char *ftypes[] = { |
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41 | "Beacon", /* 0 */ |
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42 | "Data", /* 1 */ |
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43 | "ACK", /* 2 */ |
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44 | "Command", /* 3 */ |
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45 | "Reserved", /* 4 */ |
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46 | "Reserved", /* 5 */ |
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47 | "Reserved", /* 6 */ |
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48 | "Reserved", /* 7 */ |
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49 | }; |
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50 | |
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51 | static int |
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52 | extract_header_length(u_int16_t fc) |
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53 | { |
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54 | int len = 0; |
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55 | |
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56 | switch ((fc >> 10) & 0x3) { |
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57 | case 0x00: |
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58 | if (fc & (1 << 6)) /* intra-PAN with none dest addr */ |
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59 | return -1; |
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60 | break; |
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61 | case 0x01: |
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62 | return -1; |
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63 | case 0x02: |
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64 | len += 4; |
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65 | break; |
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66 | case 0x03: |
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67 | len += 10; |
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68 | break; |
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69 | } |
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70 | |
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71 | switch ((fc >> 14) & 0x3) { |
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72 | case 0x00: |
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73 | break; |
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74 | case 0x01: |
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75 | return -1; |
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76 | case 0x02: |
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77 | len += 4; |
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78 | break; |
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79 | case 0x03: |
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80 | len += 10; |
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81 | break; |
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82 | } |
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83 | |
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84 | if (fc & (1 << 6)) { |
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85 | if (len < 2) |
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86 | return -1; |
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87 | len -= 2; |
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88 | } |
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89 | |
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90 | return len; |
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91 | } |
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92 | |
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93 | |
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94 | u_int |
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95 | ieee802_15_4_if_print(struct netdissect_options *ndo, |
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96 | const struct pcap_pkthdr *h, const u_char *p) |
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97 | { |
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98 | u_int caplen = h->caplen; |
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99 | int hdrlen; |
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100 | u_int16_t fc; |
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101 | u_int8_t seq; |
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102 | |
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103 | if (caplen < 3) { |
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104 | ND_PRINT((ndo, "[|802.15.4] %x", caplen)); |
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105 | return caplen; |
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106 | } |
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107 | |
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108 | fc = EXTRACT_LE_16BITS(p); |
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109 | hdrlen = extract_header_length(fc); |
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110 | |
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111 | seq = EXTRACT_LE_8BITS(p + 2); |
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112 | |
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113 | p += 3; |
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114 | caplen -= 3; |
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115 | |
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116 | ND_PRINT((ndo,"IEEE 802.15.4 %s packet ", ftypes[fc & 0x7])); |
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117 | if (vflag) |
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118 | ND_PRINT((ndo,"seq %02x ", seq)); |
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119 | if (hdrlen == -1) { |
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120 | ND_PRINT((ndo,"malformed! ")); |
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121 | return caplen; |
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122 | } |
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123 | |
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124 | |
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125 | if (!vflag) { |
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126 | p+= hdrlen; |
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127 | caplen -= hdrlen; |
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128 | } else { |
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129 | u_int16_t panid = 0; |
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130 | |
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131 | switch ((fc >> 10) & 0x3) { |
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132 | case 0x00: |
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133 | ND_PRINT((ndo,"none ")); |
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134 | break; |
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135 | case 0x01: |
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136 | ND_PRINT((ndo,"reserved destination addressing mode")); |
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137 | return 0; |
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138 | case 0x02: |
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139 | panid = EXTRACT_LE_16BITS(p); |
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140 | p += 2; |
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141 | ND_PRINT((ndo,"%04x:%04x ", panid, EXTRACT_LE_16BITS(p))); |
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142 | p += 2; |
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143 | break; |
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144 | case 0x03: |
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145 | panid = EXTRACT_LE_16BITS(p); |
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146 | p += 2; |
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147 | ND_PRINT((ndo,"%04x:%s ", panid, le64addr_string(p))); |
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148 | p += 8; |
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149 | break; |
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150 | } |
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151 | ND_PRINT((ndo,"< "); |
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152 | |
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153 | switch ((fc >> 14) & 0x3) { |
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154 | case 0x00: |
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155 | ND_PRINT((ndo,"none ")); |
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156 | break; |
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157 | case 0x01: |
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158 | ND_PRINT((ndo,"reserved source addressing mode")); |
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159 | return 0; |
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160 | case 0x02: |
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161 | if (!(fc & (1 << 6))) { |
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162 | panid = EXTRACT_LE_16BITS(p); |
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163 | p += 2; |
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164 | } |
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165 | ND_PRINT((ndo,"%04x:%04x ", panid, EXTRACT_LE_16BITS(p))); |
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166 | p += 2; |
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167 | break; |
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168 | case 0x03: |
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169 | if (!(fc & (1 << 6))) { |
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170 | panid = EXTRACT_LE_16BITS(p); |
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171 | p += 2; |
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172 | } |
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173 | ND_PRINT((ndo,"%04x:%s ", panid, le64addr_string(p)))); |
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174 | p += 8; |
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175 | break; |
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176 | } |
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177 | |
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178 | caplen -= hdrlen; |
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179 | } |
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180 | |
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181 | if (!suppress_default_print) |
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182 | (ndo->ndo_default_print)(ndo, p, caplen); |
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183 | |
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184 | return 0; |
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185 | } |
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