1 | /* |
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2 | * This file is part of libtrace |
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3 | * |
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4 | * Copyright (c) 2007,2008,2009,2010 The University of Waikato, Hamilton, |
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5 | * New Zealand. |
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6 | * |
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7 | * Authors: Daniel Lawson |
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8 | * Perry Lorier |
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9 | * Shane Alcock |
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10 | * |
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11 | * All rights reserved. |
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12 | * |
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13 | * This code has been developed by the University of Waikato WAND |
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14 | * research group. For further information please see http://www.wand.net.nz/ |
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15 | * |
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16 | * libtrace is free software; you can redistribute it and/or modify |
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17 | * it under the terms of the GNU General Public License as published by |
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18 | * the Free Software Foundation; either version 2 of the License, or |
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19 | * (at your option) any later version. |
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20 | * |
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21 | * libtrace is distributed in the hope that it will be useful, |
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22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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24 | * GNU General Public License for more details. |
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25 | * |
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26 | * You should have received a copy of the GNU General Public License |
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27 | * along with libtrace; if not, write to the Free Software |
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28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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29 | * |
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30 | * $Id$ |
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31 | * |
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32 | */ |
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33 | |
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34 | #include "libtrace.h" |
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35 | #include "libtrace_int.h" |
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36 | #include "format_helper.h" |
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37 | #include "config.h" |
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38 | #include "stdlib.h" |
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39 | |
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40 | #ifdef HAVE_INTTYPES_H |
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41 | # include <inttypes.h> |
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42 | #else |
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43 | # error "Can't find inttypes.h" |
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44 | #endif |
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45 | |
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46 | #include <sys/socket.h> |
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47 | |
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48 | #include <sys/types.h> |
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49 | #include <sys/time.h> |
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50 | #include <sys/ioctl.h> |
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51 | |
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52 | #include <string.h> |
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53 | #include <net/if.h> |
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54 | #include <sys/ioctl.h> |
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55 | #include <errno.h> |
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56 | #include <fcntl.h> |
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57 | #include <unistd.h> |
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58 | |
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59 | /* This format deals with the BSD Native capture format, perhaps better |
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60 | * known as BPF, which is the equivalent of the Linux Native format for |
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61 | * *BSD systems. |
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62 | * |
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63 | * This is a LIVE capture format - we're always dealing with reading from an |
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64 | * interface. |
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65 | * |
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66 | * This format does not support writing, but BPF packet records can be easily |
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67 | * converted to PCAP or ERF. |
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68 | */ |
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69 | |
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70 | /* "Global" data that is stored for each BPF input trace */ |
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71 | struct libtrace_format_data_t { |
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72 | /* The file descriptor that is being captured from */ |
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73 | int fd; |
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74 | /* The snap length for the capture */ |
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75 | int snaplen; |
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76 | /* A boolean flag indicating whether the capture interface should be |
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77 | * in promiscuous mode */ |
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78 | int promisc; |
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79 | /* A buffer to write captured data into */ |
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80 | void *buffer; |
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81 | /* The current read location in the capture buffer */ |
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82 | void *bufptr; |
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83 | /* The total size of the capture buffer */ |
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84 | unsigned int buffersize; |
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85 | /* The amount of space remaining before the capture buffer is full */ |
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86 | int remaining; |
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87 | /* The linktype of the capture interface */ |
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88 | unsigned int linktype; |
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89 | /* Statistics about how many packets have been dropped, received etc. */ |
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90 | struct bpf_stat stats; |
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91 | /* A boolean flag indicating whether the statistics are up-to-date */ |
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92 | int stats_valid; |
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93 | }; |
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94 | |
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95 | #define FORMATIN(x) ((struct libtrace_format_data_t*)((x->format_data))) |
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96 | |
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97 | #define BPFHDR(x) ((struct bpf_hdr *)((x)->header)) |
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98 | |
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99 | /* Attempts to determine if a given filename could refer to a BPF interface */ |
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100 | static int bpf_probe_filename(const char *filename) |
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101 | { |
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102 | return (if_nametoindex(filename) != 0); |
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103 | } |
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104 | |
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105 | /* Initialises a BPF input trace */ |
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106 | static int bpf_init_input(libtrace_t *libtrace) |
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107 | { |
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108 | libtrace->format_data = (struct libtrace_format_data_t *) |
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109 | malloc(sizeof(struct libtrace_format_data_t)); |
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110 | |
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111 | /* Throw some default values into the format data */ |
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112 | FORMATIN(libtrace)->fd = -1; |
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113 | FORMATIN(libtrace)->promisc = 0; |
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114 | FORMATIN(libtrace)->snaplen = 65536; |
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115 | FORMATIN(libtrace)->stats_valid = 0; |
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116 | |
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117 | return 0; |
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118 | } |
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119 | |
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120 | /* Starts a BPF input trace */ |
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121 | static int bpf_start_input(libtrace_t *libtrace) |
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122 | { |
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123 | int bpfid=0; |
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124 | struct bpf_version bv; |
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125 | struct ifreq ifr; |
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126 | unsigned int v; |
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127 | |
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128 | /* Find and open a bpf device */ |
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129 | do { |
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130 | char buffer[64]; |
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131 | snprintf(buffer,sizeof(buffer),"/dev/bpf%d", bpfid); |
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132 | bpfid++; |
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133 | |
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134 | FORMATIN(libtrace)->fd = open(buffer, O_RDONLY); |
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135 | } while(FORMATIN(libtrace)->fd == -1 && errno == EBUSY); |
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136 | |
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137 | if (FORMATIN(libtrace)->fd == -1) { |
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138 | trace_set_err(libtrace,TRACE_ERR_INIT_FAILED, |
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139 | "No free bpf devices"); |
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140 | return -1; |
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141 | } |
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142 | |
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143 | /* Check the BPF Version is ok */ |
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144 | if (ioctl(FORMATIN(libtrace)->fd, BIOCVERSION, &bv) == -1) { |
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145 | trace_set_err(libtrace,errno, |
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146 | "Failed to read the bpf version"); |
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147 | close(FORMATIN(libtrace)->fd); |
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148 | return -1; |
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149 | } |
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150 | |
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151 | if (bv.bv_major != BPF_MAJOR_VERSION) { |
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152 | trace_set_err(libtrace,errno, |
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153 | "Unknown kernel BPF version (%d.%d, libtrace requires at least %d.%d)", |
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154 | bv.bv_major, |
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155 | bv.bv_minor, |
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156 | BPF_MAJOR_VERSION, |
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157 | BPF_MINOR_VERSION); |
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158 | close(FORMATIN(libtrace)->fd); |
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159 | return -1; |
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160 | } |
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161 | |
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162 | if (bv.bv_minor < BPF_MINOR_VERSION) { |
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163 | trace_set_err(libtrace,errno, "Kernel version too old (%d.%d, libtrace requires at least %d.%d)", |
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164 | bv.bv_major, |
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165 | bv.bv_minor, |
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166 | BPF_MAJOR_VERSION, |
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167 | BPF_MINOR_VERSION); |
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168 | close(FORMATIN(libtrace)->fd); |
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169 | return -1; |
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170 | } |
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171 | |
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172 | /* We assume the default kernel buffer size is sufficient. */ |
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173 | if (ioctl(FORMATIN(libtrace)->fd, BIOCGBLEN, |
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174 | &FORMATIN(libtrace)->buffersize)==-1) { |
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175 | trace_set_err(libtrace,errno,"Failed to find buffer length"); |
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176 | close(FORMATIN(libtrace)->fd); |
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177 | return -1; |
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178 | } |
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179 | |
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180 | FORMATIN(libtrace)->buffer = malloc(FORMATIN(libtrace)->buffersize); |
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181 | FORMATIN(libtrace)->bufptr = FORMATIN(libtrace)->buffer; |
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182 | FORMATIN(libtrace)->remaining = 0; |
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183 | |
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184 | /* Attach to the device */ |
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185 | strncpy(ifr.ifr_name, libtrace->uridata, sizeof(ifr.ifr_name)); |
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186 | if (ioctl(FORMATIN(libtrace)->fd, BIOCSETIF, &ifr) == -1) { |
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187 | trace_set_err(libtrace,errno,"Failed to attach"); |
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188 | close(FORMATIN(libtrace)->fd); |
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189 | return -1; |
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190 | } |
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191 | |
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192 | /* Set the link type */ |
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193 | if (ioctl(FORMATIN(libtrace)->fd, BIOCGDLT, |
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194 | &FORMATIN(libtrace)->linktype) == -1) { |
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195 | trace_set_err(libtrace,errno,"Failed to retrieve link type"); |
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196 | close(FORMATIN(libtrace)->fd); |
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197 | return -1; |
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198 | } |
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199 | |
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200 | /* TODO: If BIOCGDLTLIST exists then we should perhaps do something |
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201 | * with it. We don't have the same concept of multiple DLT's |
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202 | * as pcap does. We grab the rawest possible thing and then |
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203 | * decode packets by understanding the protocols. So perhaps |
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204 | * we should setup a rating of DLT's that we'll prefer in order. |
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205 | * For example we should try and get 802.11 frames rather than |
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206 | * 802.3 frames. The general rule should be "whatever actually |
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207 | * went over the air", although of course if we don't support |
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208 | * what went over the air we should fall back to something we |
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209 | * /do/ support. |
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210 | */ |
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211 | |
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212 | /* Using timeouts seems sucky. We'll always use immediate mode. We |
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213 | * pray the kernel is smart enough that if a another packet arrives |
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214 | * while we're processing this one that it will buffer them into it's |
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215 | * kernel buffer so we can receive packets later. (It'll need to do this |
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216 | * to deal with us spending time processing the last 'n' packets anyway) |
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217 | */ |
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218 | |
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219 | v=1; |
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220 | if (ioctl(FORMATIN(libtrace)->fd, BIOCIMMEDIATE, &v) == -1) { |
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221 | trace_set_err(libtrace,errno,"Failed to set immediate mode"); |
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222 | close(FORMATIN(libtrace)->fd); |
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223 | return -1; |
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224 | } |
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225 | |
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226 | /* Set promiscous mode, if the user has asked us to do so */ |
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227 | if (FORMATIN(libtrace)->promisc) { |
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228 | if (ioctl(FORMATIN(libtrace)->fd, BIOCPROMISC, NULL) == -1) { |
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229 | trace_set_err(libtrace,errno, |
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230 | "Failed to set promisc mode"); |
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231 | close(FORMATIN(libtrace)->fd); |
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232 | return -1; |
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233 | |
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234 | } |
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235 | } |
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236 | |
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237 | FORMATIN(libtrace)->stats_valid = 0; |
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238 | |
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239 | /* TODO: we should always set a bpf filter for snapping */ |
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240 | |
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241 | /* We're done! */ |
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242 | return 0; |
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243 | } |
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244 | |
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245 | /* Gets a count of the number of packets received on the BPF interface */ |
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246 | static uint64_t bpf_get_received_packets(libtrace_t *trace) |
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247 | { |
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248 | if (trace->format_data == NULL) |
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249 | return (uint64_t)-1; |
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250 | |
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251 | if (FORMATIN(trace)->fd == -1) { |
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252 | /* Almost certainly a 'dead' trace so there is no socket |
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253 | * for us to query */ |
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254 | return (uint64_t) -1; |
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255 | } |
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256 | /* If we're called with stats_valid == 0, or we're called again |
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257 | * then refresh the stats. Don't refresh the stats if we're called |
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258 | * immediately after get_dropped_packets |
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259 | */ |
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260 | if ((FORMATIN(trace)->stats_valid & 1) |
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261 | || (FORMATIN(trace)->stats_valid == 0)) { |
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262 | ioctl(FORMATIN(trace)->fd, BIOCGSTATS, &FORMATIN(trace)->stats); |
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263 | FORMATIN(trace)->stats_valid |= 1; |
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264 | } |
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265 | |
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266 | return FORMATIN(trace)->stats.bs_recv; |
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267 | } |
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268 | |
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269 | /* Gets a count of the number of packets dropped on the BPF interface */ |
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270 | static uint64_t bpf_get_dropped_packets(libtrace_t *trace) |
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271 | { |
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272 | if (trace->format_data == NULL) |
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273 | return (uint64_t)-1; |
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274 | |
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275 | if (FORMATIN(trace)->fd == -1) { |
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276 | /* Almost certainly a 'dead' trace so there is no socket |
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277 | * for us to query */ |
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278 | return (uint64_t) -1; |
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279 | } |
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280 | /* If we're called with stats_valid == 0, or we're called again |
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281 | * then refresh the stats. Don't refresh the stats if we're called |
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282 | * immediately after get_received_packets |
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283 | */ |
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284 | if ((FORMATIN(trace)->stats_valid & 2) |
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285 | || (FORMATIN(trace)->stats_valid == 0)) { |
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286 | ioctl(FORMATIN(trace)->fd, BIOCGSTATS, &FORMATIN(trace)->stats); |
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287 | FORMATIN(trace)->stats_valid |= 2; |
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288 | } |
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289 | |
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290 | return FORMATIN(trace)->stats.bs_drop; |
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291 | } |
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292 | |
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293 | /* Pauses a BPF input trace */ |
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294 | static int bpf_pause_input(libtrace_t *libtrace) |
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295 | { |
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296 | close(FORMATIN(libtrace)->fd); |
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297 | FORMATIN(libtrace)->fd=-1; |
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298 | |
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299 | return 0; |
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300 | } |
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301 | |
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302 | /* Closes a BPF input trace */ |
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303 | static int bpf_fin_input(libtrace_t *libtrace) |
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304 | { |
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305 | free(libtrace->format_data); |
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306 | return 0; |
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307 | } |
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308 | |
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309 | /* Configures a BPF input trace */ |
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310 | static int bpf_config_input(libtrace_t *libtrace, |
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311 | trace_option_t option, |
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312 | void *data) |
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313 | { |
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314 | switch(option) { |
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315 | case TRACE_OPTION_SNAPLEN: |
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316 | FORMATIN(libtrace)->snaplen=*(int*)data; |
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317 | return 0; |
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318 | case TRACE_OPTION_PROMISC: |
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319 | FORMATIN(libtrace)->promisc=*(int*)data; |
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320 | return 0; |
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321 | case TRACE_OPTION_FILTER: |
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322 | /* We don't support bpf filters in any special way |
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323 | * so return an error and let libtrace deal with |
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324 | * emulating it |
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325 | */ |
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326 | break; |
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327 | case TRACE_OPTION_META_FREQ: |
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328 | /* No meta-data for this format */ |
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329 | break; |
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330 | case TRACE_OPTION_EVENT_REALTIME: |
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331 | /* Captures are always realtime */ |
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332 | break; |
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333 | |
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334 | /* Avoid default: so that future options will cause a warning |
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335 | * here to remind us to implement it, or flag it as |
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336 | * unimplementable |
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337 | */ |
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338 | } |
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339 | trace_set_err(libtrace,TRACE_ERR_UNKNOWN_OPTION, |
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340 | "Unknown option %i", option); |
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341 | return -1; |
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342 | } |
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343 | |
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344 | /* Converts a buffer containing a recently read BPF packet record into a |
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345 | * libtrace packet */ |
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346 | static int bpf_prepare_packet(libtrace_t *libtrace, libtrace_packet_t *packet, |
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347 | void *buffer, libtrace_rt_types_t rt_type, uint32_t flags) { |
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348 | |
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349 | /* If the packet previously owned a buffer that is not the buffer |
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350 | * that contains the new packet data, we're going to need to free the |
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351 | * old one to avoid memory leaks */ |
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352 | if (packet->buffer != buffer && |
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353 | packet->buf_control == TRACE_CTRL_PACKET) { |
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354 | free(packet->buffer); |
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355 | } |
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356 | |
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357 | /* Set the buffer owner appropriately */ |
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358 | if ((flags & TRACE_PREP_OWN_BUFFER) == TRACE_PREP_OWN_BUFFER) { |
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359 | packet->buf_control = TRACE_CTRL_PACKET; |
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360 | } else |
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361 | packet->buf_control = TRACE_CTRL_EXTERNAL; |
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362 | |
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363 | /* Update the packet pointers and type appropriately */ |
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364 | packet->buffer = buffer; |
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365 | packet->header = buffer; |
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366 | packet->type = rt_type; |
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367 | |
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368 | /* Find the payload */ |
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369 | /* TODO: Pcap deals with a padded FDDI linktype here */ |
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370 | packet->payload=(char *)buffer + BPFHDR(packet)->bh_hdrlen; |
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371 | |
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372 | if (libtrace->format_data == NULL) { |
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373 | if (bpf_init_input(libtrace)) |
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374 | return -1; |
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375 | } |
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376 | |
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377 | return 0; |
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378 | } |
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379 | |
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380 | /* Reads the next packet record from a BPF interface and writes it into a |
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381 | * libtrace packet */ |
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382 | static int bpf_read_packet(libtrace_t *libtrace, libtrace_packet_t *packet) |
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383 | { |
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384 | uint32_t flags = 0; |
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385 | |
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386 | packet->type = bpf_linktype_to_rt(ntohs(FORMATIN(libtrace)->linktype)); |
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387 | |
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388 | /* Read from the BPF interface into our capture buffer */ |
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389 | if (FORMATIN(libtrace)->remaining<=0) { |
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390 | int ret; |
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391 | |
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392 | ret=read(FORMATIN(libtrace)->fd, |
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393 | FORMATIN(libtrace)->buffer, |
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394 | FORMATIN(libtrace)->buffersize); |
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395 | |
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396 | if (ret == -1) { |
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397 | trace_set_err(libtrace,errno,"Failed to read"); |
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398 | return -1; |
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399 | } |
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400 | |
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401 | if (ret == 0) { |
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402 | /* EOF */ |
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403 | return 0; |
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404 | } |
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405 | |
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406 | FORMATIN(libtrace)->remaining=ret; |
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407 | FORMATIN(libtrace)->bufptr= |
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408 | FORMATIN(libtrace)->buffer; |
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409 | } |
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410 | |
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411 | /* We do NOT want anything trying to free the memory the packet is |
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412 | * stored in */ |
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413 | flags |= TRACE_PREP_DO_NOT_OWN_BUFFER; |
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414 | |
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415 | if (packet->buf_control == TRACE_CTRL_PACKET) |
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416 | free(packet->buffer); |
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417 | |
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418 | /* Update 'packet' to point to the first packet in our capture |
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419 | * buffer */ |
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420 | if (bpf_prepare_packet(libtrace, packet, FORMATIN(libtrace)->bufptr, |
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421 | packet->type, flags)) { |
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422 | return -1; |
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423 | } |
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424 | |
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425 | |
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426 | /* Skip past the packet record we're going to return, making sure |
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427 | * that we deal with padding correctly */ |
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428 | FORMATIN(libtrace)->bufptr+= |
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429 | BPF_WORDALIGN(BPFHDR(packet)->bh_hdrlen |
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430 | +BPFHDR(packet)->bh_caplen); |
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431 | FORMATIN(libtrace)->remaining-= |
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432 | BPF_WORDALIGN(BPFHDR(packet)->bh_hdrlen |
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433 | +BPFHDR(packet)->bh_caplen); |
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434 | |
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435 | return BPFHDR(packet)->bh_datalen+BPFHDR(packet)->bh_hdrlen; |
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436 | } |
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437 | |
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438 | /* Returns the linktype for the interface that we are capturing from */ |
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439 | static libtrace_linktype_t bpf_get_link_type(const libtrace_packet_t *packet) { |
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440 | /* Convert the linktype that we recorded when we started the trace |
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441 | * into a suitable libtrace linktype */ |
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442 | return pcap_linktype_to_libtrace(rt_to_pcap_linktype(packet->type)); |
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443 | } |
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444 | |
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445 | /* Returns the direction for a given BPF packet record */ |
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446 | static libtrace_direction_t bpf_get_direction(const libtrace_packet_t *packet UNUSED) { |
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447 | /* BPF sadly can't do direction tagging */ |
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448 | return ~0; |
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449 | } |
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450 | |
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451 | /* Returns the timestamp for a given BPF packet record, in the form of a |
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452 | * struct timeval */ |
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453 | static struct timeval bpf_get_timeval(const libtrace_packet_t *packet) |
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454 | { |
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455 | struct timeval tv; |
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456 | /* OpenBSD uses a bpf_timeval rather than a timeval so we must copy |
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457 | * each timeval element individually rather than doing a structure |
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458 | * assignment */ |
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459 | tv.tv_sec = BPFHDR(packet)->bh_tstamp.tv_sec; |
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460 | tv.tv_usec = BPFHDR(packet)->bh_tstamp.tv_usec; |
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461 | |
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462 | return tv; |
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463 | } |
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464 | |
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465 | /* Returns the capture length for a given BPF packet record */ |
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466 | static int bpf_get_capture_length(const libtrace_packet_t *packet) |
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467 | { |
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468 | /* BPF doesn't include the FCS in its caplen field, but libtrace |
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469 | * does so we need to add this extra 4 bytes */ |
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470 | return BPFHDR(packet)->bh_caplen+4; |
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471 | } |
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472 | |
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473 | /* Returns the wire length for a given BPF packet record */ |
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474 | static int bpf_get_wire_length(const libtrace_packet_t *packet) |
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475 | { |
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476 | |
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477 | /* BPF doesn't include the FCS in its datalen field, but libtrace |
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478 | * does so we need to add this extra 4 bytes */ |
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479 | return BPFHDR(packet)->bh_datalen+4; |
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480 | } |
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481 | |
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482 | /* Returns the framing length for a given BPF packet record */ |
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483 | static int bpf_get_framing_length(UNUSED |
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484 | const libtrace_packet_t *packet) |
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485 | { |
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486 | return BPFHDR(packet)->bh_hdrlen; |
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487 | } |
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488 | |
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489 | /* Returns the file descriptor that the capture interface is operating on */ |
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490 | static int bpf_get_fd(const libtrace_t *trace) { |
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491 | return FORMATIN(trace)->fd; |
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492 | } |
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493 | |
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494 | /* Prints some slightly useful help text for the BPF capture format */ |
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495 | static void bpf_help() { |
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496 | printf("bpf format module: $Revision$\n"); |
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497 | printf("Supported input URIs:\n"); |
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498 | printf("\tbpf:\n"); |
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499 | printf("\n"); |
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500 | return; |
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501 | } |
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502 | static struct libtrace_format_t bpf = { |
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503 | "bpf", |
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504 | "$Id$", |
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505 | TRACE_FORMAT_BPF, |
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506 | bpf_probe_filename, /* probe filename */ |
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507 | NULL, /* probe magic */ |
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508 | bpf_init_input, /* init_input */ |
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509 | bpf_config_input, /* config_input */ |
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510 | bpf_start_input, /* start_input */ |
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511 | bpf_pause_input, /* pause_input */ |
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512 | NULL, /* init_output */ |
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513 | NULL, /* config_output */ |
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514 | NULL, /* start_ouput */ |
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515 | bpf_fin_input, /* fin_input */ |
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516 | NULL, /* fin_output */ |
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517 | bpf_read_packet, /* read_packet */ |
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518 | bpf_prepare_packet, /* prepare_packet */ |
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519 | NULL, /* fin_packet */ |
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520 | NULL, /* write_packet */ |
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521 | bpf_get_link_type, /* get_link_type */ |
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522 | bpf_get_direction, /* get_direction */ |
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523 | NULL, /* set_direction */ |
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524 | NULL, /* get_erf_timestamp */ |
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525 | bpf_get_timeval, /* get_timeval */ |
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526 | NULL, /* get_timespec */ |
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527 | NULL, /* get_seconds */ |
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528 | NULL, /* seek_erf */ |
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529 | NULL, /* seek_timeval */ |
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530 | NULL, /* seek_seconds */ |
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531 | bpf_get_capture_length, /* get_capture_length */ |
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532 | bpf_get_wire_length, /* get_wire_length */ |
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533 | bpf_get_framing_length, /* get_framing_length */ |
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534 | NULL, /* set_capture_length */ |
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535 | bpf_get_received_packets,/* get_received_packets */ |
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536 | NULL, /* get_filtered_packets */ |
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537 | bpf_get_dropped_packets,/* get_dropped_packets */ |
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538 | NULL, /* get_captured_packets */ |
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539 | bpf_get_fd, /* get_fd */ |
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540 | trace_event_device, /* trace_event */ |
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541 | bpf_help, /* help */ |
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542 | NULL |
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543 | }; |
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544 | |
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545 | void bpf_constructor() { |
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546 | register_format(&bpf); |
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547 | } |
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