1 | /* |
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2 | * libpacketdump decoder for Radiotap |
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3 | */ |
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4 | #include <sys/types.h> |
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5 | #include <netinet/in.h> |
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6 | #include <stdio.h> |
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7 | #include <inttypes.h> |
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8 | #include <dlfcn.h> |
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9 | #include "libtrace.h" |
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10 | #include "libpacketdump.h" |
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11 | #include "libtrace_int.h" /* bswaps */ |
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12 | |
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13 | #define ALIGN_NATURAL_32(_p,_s,_c) \ |
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14 | while ( (_p - _s) % sizeof(uint32_t)) {_p++; _c++;} |
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15 | #define ALIGN_NATURAL_16(_p,_s,_c) \ |
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16 | while ( (_p - _s) % sizeof(uint16_t)) {_p++; _c++;} |
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17 | |
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18 | void decode(int link_type,const char *packet,unsigned len) |
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19 | { |
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20 | uint32_t *ptr; |
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21 | uint8_t *p; /* Our current field "cursor" */ |
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22 | uint8_t *s; /* Start of data fields, for alignment */ |
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23 | struct libtrace_radiotap_t *rtap; |
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24 | uint16_t rtap_len; |
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25 | uint16_t rtap_real_len; /* to make sure length in header matches fields present */ |
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26 | rtap = (libtrace_radiotap_t *)packet; |
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27 | |
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28 | printf(" Radiotap:"); |
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29 | |
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30 | if (len < 8) { |
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31 | printf(" [|Truncated (%u bytes)]\n", len); |
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32 | return; |
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33 | } |
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34 | |
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35 | rtap_real_len = sizeof(struct libtrace_radiotap_t); |
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36 | rtap_len = bswap_le_to_host16(rtap->it_len); |
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37 | |
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38 | printf(" version: %u, length: %u, fields: %#08x\n", rtap->it_version, |
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39 | rtap_len, rtap->it_present); |
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40 | |
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41 | /* Check for extended bitmasks */ |
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42 | ptr = (uint32_t *) &(rtap->it_present); |
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43 | |
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44 | if ( (*ptr) & (1 << TRACE_RADIOTAP_EXT) ) |
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45 | printf(" extended fields:"); |
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46 | |
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47 | while( (*ptr) & (1 << TRACE_RADIOTAP_EXT) ) { |
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48 | rtap_real_len += sizeof (uint32_t); |
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49 | printf(" %#08x", *(++ptr)); |
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50 | } |
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51 | |
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52 | |
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53 | /* make p point to the first data field */ |
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54 | s = p = (uint8_t *) ++ptr; |
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55 | |
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56 | if (rtap->it_present & (1 << TRACE_RADIOTAP_TSFT)) { |
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57 | printf(" Radiotap: TSFT = %llu microseconds\n", bswap_le_to_host64(*((uint64_t *)p))); |
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58 | p += sizeof (uint64_t); |
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59 | rtap_real_len += sizeof (uint64_t); |
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60 | } |
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61 | |
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62 | if (rtap->it_present & (1 << TRACE_RADIOTAP_FLAGS)) { |
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63 | printf(" Radiotap: Flags = 0x%02x\n", *p); |
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64 | p += sizeof (uint8_t); |
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65 | rtap_real_len += sizeof(uint8_t); |
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66 | } |
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67 | |
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68 | |
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69 | if (rtap->it_present & (1 << TRACE_RADIOTAP_RATE)) { |
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70 | printf(" Radiotap: Rate = %u kbps\n", (*p) * 500); |
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71 | p += sizeof (uint8_t); |
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72 | rtap_real_len += sizeof(uint8_t); |
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73 | } |
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74 | |
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75 | if (rtap->it_present & (1 << TRACE_RADIOTAP_CHANNEL)) { |
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76 | ALIGN_NATURAL_16(p,s,rtap_real_len); |
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77 | printf(" Radiotap: Freq = %u MHz, ChanFlags: 0x%04x\n", bswap_le_to_host16(*((uint16_t *)p)), |
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78 | *(((uint16_t *)p) + 1)); |
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79 | p += sizeof (uint32_t); |
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80 | rtap_real_len += sizeof(uint32_t); |
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81 | } |
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82 | |
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83 | if (rtap->it_present & (1 << TRACE_RADIOTAP_FHSS)) { |
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84 | ALIGN_NATURAL_16(p,s, rtap_real_len); |
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85 | printf(" Radiotap: FHSS HopSet = %u , HopPattern: %u\n", *p, *(p+1)); |
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86 | p += sizeof (uint16_t); |
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87 | rtap_real_len += sizeof(uint16_t); |
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88 | } |
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89 | |
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90 | |
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91 | if (rtap->it_present & (1 << TRACE_RADIOTAP_DBM_ANTSIGNAL)) { |
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92 | printf(" Radiotap: Signal = %i dBm\n", (int8_t) *p) ; |
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93 | p += sizeof (uint8_t); |
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94 | rtap_real_len += sizeof(uint8_t); |
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95 | } |
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96 | |
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97 | |
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98 | if (rtap->it_present & (1 << TRACE_RADIOTAP_DBM_ANTNOISE)) { |
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99 | printf(" Radiotap: Noise = %i dBm\n", (int8_t) *p); |
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100 | p += sizeof (uint8_t); |
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101 | rtap_real_len += sizeof(uint8_t); |
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102 | } |
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103 | |
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104 | |
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105 | if (rtap->it_present & (1 << TRACE_RADIOTAP_LOCK_QUALITY)) { |
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106 | ALIGN_NATURAL_16(p,s, rtap_real_len); |
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107 | printf(" Radiotap: Barker Code Lock Quality = %u\n", bswap_le_to_host16(*((uint16_t *)p))); |
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108 | p += sizeof (uint16_t); |
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109 | rtap_real_len += sizeof(uint16_t); |
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110 | } |
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111 | |
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112 | |
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113 | if (rtap->it_present & (1 << TRACE_RADIOTAP_TX_ATTENUATION)) { |
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114 | ALIGN_NATURAL_16(p,s, rtap_real_len); |
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115 | printf(" Radiotap: TX Attenuation = %u\n", bswap_le_to_host16(*((uint16_t *)p))); |
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116 | p += sizeof (uint16_t); |
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117 | rtap_real_len += sizeof(uint16_t); |
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118 | } |
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119 | |
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120 | if (rtap->it_present & (1 << TRACE_RADIOTAP_DB_TX_ATTENUATION)) { |
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121 | ALIGN_NATURAL_16(p,s,rtap_real_len); |
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122 | printf(" Radiotap: TX Attenuation = %u dB\n", bswap_le_to_host16(*((uint16_t *)p))); |
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123 | p += sizeof (uint16_t); |
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124 | rtap_real_len += sizeof(uint16_t); |
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125 | } |
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126 | |
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127 | if (rtap->it_present & (1 << TRACE_RADIOTAP_DBM_TX_POWER)) { |
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128 | printf(" Radiotap: TX Power = %i dBm\n", *p); |
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129 | p += sizeof (uint8_t); |
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130 | rtap_real_len += sizeof(uint8_t); |
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131 | } |
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132 | |
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133 | if (rtap->it_present & (1 << TRACE_RADIOTAP_ANTENNA)) { |
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134 | printf(" Radiotap: Antenna = %u\n", *p); |
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135 | p += sizeof (uint8_t); |
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136 | rtap_real_len += sizeof(uint8_t); |
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137 | } |
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138 | |
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139 | if (rtap->it_present & (1 << TRACE_RADIOTAP_DB_ANTSIGNAL)) { |
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140 | printf(" Radiotap: Signal = %u dB\n", *p); |
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141 | p += sizeof (uint8_t); |
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142 | rtap_real_len += sizeof(uint8_t); |
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143 | } |
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144 | |
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145 | if (rtap->it_present & (1 << TRACE_RADIOTAP_DB_ANTNOISE)) { |
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146 | printf(" Radiotap: Noise = %u dB\n", *p); |
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147 | p += sizeof (uint8_t); |
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148 | rtap_real_len += sizeof(uint8_t); |
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149 | } |
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150 | |
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151 | if (rtap->it_present & (1 << TRACE_RADIOTAP_RX_FLAGS)) { |
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152 | ALIGN_NATURAL_16(p,s,rtap_real_len); |
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153 | printf(" Radiotap: RX Flags = 0x%04x\n", *((uint16_t *)p)); |
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154 | p += sizeof (uint16_t); |
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155 | rtap_real_len += sizeof(uint16_t); |
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156 | } |
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157 | |
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158 | if (rtap->it_present & (1 << TRACE_RADIOTAP_TX_FLAGS)) { |
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159 | ALIGN_NATURAL_16(p,s,rtap_real_len); |
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160 | printf(" Radiotap: TX Flags = 0x%04x\n", *((uint16_t *)p)); |
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161 | p += sizeof (uint16_t); |
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162 | rtap_real_len += sizeof(uint16_t); |
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163 | } |
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164 | |
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165 | if (rtap->it_present & (1 << TRACE_RADIOTAP_RTS_RETRIES)) { |
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166 | printf(" Radiotap: RTS Retries = %u\n", *p); |
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167 | p += sizeof (uint8_t); |
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168 | rtap_real_len += sizeof(uint8_t); |
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169 | } |
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170 | |
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171 | if (rtap->it_present & (1 << TRACE_RADIOTAP_DATA_RETRIES)) { |
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172 | printf(" Radiotap: Data Retries = %u\n", *p); |
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173 | p += sizeof (uint8_t); |
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174 | rtap_real_len += sizeof(uint8_t); |
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175 | } |
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176 | |
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177 | if (rtap_real_len != rtap_len) |
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178 | printf(" Radiotap: WARNING: Header contains un-decoded fields.\n"); |
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179 | |
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180 | if (len > rtap_len) |
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181 | decode_next(packet + rtap_len, len - rtap_len, "link", TRACE_TYPE_80211); |
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182 | |
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183 | return; |
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184 | |
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185 | } |
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