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  64. <h4 class="subsection">21.3.3 BPF</h4>
  65. <dl compact="compact">
  66. <dt><code>target sim <span class="roman">[</span><var>simargs</var><span class="roman">]</span> &hellip;</code></dt>
  67. <dd><p>The <small>GDB</small> BPF simulator accepts the following optional arguments.
  68. </p>
  69. <dl compact="compact">
  70. <dt><code>--skb-data-offset=<var>offset</var></code></dt>
  71. <dd><p>Tell the simulator the offset, measured in bytes, of the
  72. <code>skb_data</code> field in the kernel <code>struct sk_buff</code> structure.
  73. This offset is used by some BPF specific-purpose load/store
  74. instructions. Defaults to 0.
  75. </p></dd>
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