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@@ -152,24 +152,110 @@
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<thead>
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<row>
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<entry>Name</entry>
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- <entry>Example</entry>
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+ <entry>Example expression</entry>
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+ <entry>Example value</entry>
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<entry>Description</entry>
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</row>
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</thead>
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+
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<tbody>
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-<row><entry>String</entry><entry>'example'</entry><entry>A string</entry></row>
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-<row><entry>Hex String</entry><entry>0XABCD</entry><entry>A hexadecimal string</entry></row>
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-<row><entry>IP Address</entry><entry>10.0.0.1</entry><entry>An IP address</entry></row>
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-<row><entry>Integer</entry><entry>123</entry><entry>An integer value</entry></row>
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+ <row>
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+ <entry>String literal</entry>
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+ <entry>'example'</entry>
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+ <entry>'example'</entry>
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+ <entry>A string</entry>
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+ </row>
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+ <row>
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+ <entry>Hexadecimal string literal</entry>
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+ <entry>0x5a7d</entry>
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+ <entry>'Z}'</entry>
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+ <entry>A hexadecimal string</entry>
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+ </row>
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+ <row>
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+ <entry>IP address literal</entry>
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+ <entry>10.0.0.1</entry>
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+ <entry>0x0a000001</entry>
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+ <entry>An IP address</entry>
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+ </row>
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+ <row>
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+ <entry>Integer literal</entry>
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+ <entry>123</entry>
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+ <entry>'123'</entry>
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+ <entry>An integer value</entry>
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+ </row>
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+ <row></row>
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+ <row>
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+ <entry>Binary content of the option</entry>
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+ <entry>option[123].hex</entry>
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+ <entry>'(content of the option)'</entry>
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+ <entry>The value of the option with given code from the
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+ packet as hex</entry>
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+ </row>
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-<row><entry>Option Text</entry><entry>option[code].text</entry><entry>The value of the option with code "code" from the packet as text</entry></row>
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+ <row>
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+ <entry>Option Text</entry>
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+ <entry>option[123].text</entry>
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+ <entry>'foobar'</entry>
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+ <entry>The value of the option with given code from the
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+ packet as text</entry>
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+ </row>
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-->
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-<row><entry>Option Hex</entry><entry>option[code].hex</entry><entry>The value of the option with code "code" from the packet as hex</entry></row>
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-<row><entry>Option Exist</entry><entry>option[code].exist</entry><entry>If the option with code "code" is present in the packet "true" else "false"</entry></row>
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-<row><entry>DHCPv4 Relay Agent
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-sub-option</entry><entry>relay4[code].hex</entry><entry>The value of
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-sub-option with code "code" from the DHCPv4 Relay Agent Information option
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-(option 82)</entry></row>
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+ <row>
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+ <entry>Option existence</entry>
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+ <entry>option[123].exist</entry>
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+ <entry>'true'</entry>
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+ <entry>If the option with given code is present in the
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+ packet "true" else "false"</entry>
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+ </row>
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+ <row>
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+ <entry>DHCPv4 relay agent sub-option</entry>
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+ <entry>relay4[123].hex</entry>
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+ <entry>'(content of the RAI sub-option)'</entry>
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+ <entry>The value of sub-option with given code from the
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+ DHCPv4 Relay Agent Information option (option 82)</entry>
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+ </row>
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+ <row>
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+ <entry>Hardware address in DHCPv4 packet</entry>
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+ <entry>pkt4.mac</entry>
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+ <entry>0x010203040506</entry>
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+ <entry>The value of the chaddr field of the DHCPv4 packet.</entry>
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+ </row>
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+ <row>
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+ <entry>Hardware length in DHCPv4 packet</entry>
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+ <entry>pkt4.hlen</entry>
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+ <entry>0x06</entry>
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+ <entry>The value of the hlen field of the DHCPv4 packet.</entry>
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+ </row>
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+ <row>
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+ <entry>Hardware type in DHCPv4 packet</entry>
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+ <entry>pkt4.htype</entry>
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+ <entry>0x7b</entry>
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+ <entry>The value of the htype field of the DHCPv4 packet.</entry>
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+ </row>
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+ <row>
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+ <entry>ciaddr field in DHCPv4 packet</entry>
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+ <entry>pkt4.ciaddr</entry>
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+ <entry>192.0.2.1</entry>
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+ <entry>The value of the ciaddr field of the DHCPv4 packet.</entry>
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+ </row>
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+ <row>
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+ <entry>giaddr field in DHCPv4 packet</entry>
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+ <entry>pkt4.giaddr</entry>
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+ <entry>192.0.2.1</entry>
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+ <entry>The value of the giaddr field of the DHCPv4 packet.</entry>
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+ </row>
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+ <row>
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+ <entry>yiaddr field in DHCPv4 packet</entry>
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+ <entry>pkt4.yiaddr</entry>
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+ <entry>192.0.2.1</entry>
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+ <entry>The value of the yiaddr field of the DHCPv4 packet.</entry>
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+ </row>
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+ <row>
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+ <entry>siaddr field in DHCPv4 packet</entry>
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+ <entry>pkt4.siaddr</entry>
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+ <entry>192.0.2.1</entry>
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+ <entry>The value of the siaddr field of the DHCPv4 packet.</entry>
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+ </row>
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</tbody>
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</tgroup>
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</table>
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@@ -189,14 +275,14 @@ sub-option with code "code" from the DHCPv4 Relay Agent Information option
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</para>
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<para>
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- "option[code].hex" extracts the value of the option with the given code
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+ "option[code].hex" extracts the value of the option with the code "code"
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from the incoming packet. If the packet doesn't contain the option, it
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returns the empty string. The string is presented as a byte string of
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the option payload without the type code or length fields.
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</para>
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<para>
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- "option[code].exist" checks if an option with the given code is present
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+ "option[code].exist" checks if an option with the code "code" is present
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in the incoming packet. It can be used with empty options.
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</para>
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@@ -216,6 +302,10 @@ sub-option with code "code" from the DHCPv4 Relay Agent Information option
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</para>
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<para>
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+ Expressions starting with pkt4 can be used only in DHCPv4.
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+ </para>
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+
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+ <para>
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<table frame="all" id="classification-expressions-list">
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<title>List of Classification Expressions</title>
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<tgroup cols='3'>
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Francis Dupont