path: root/doc/sphinx/uml/packet4.svg

<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="1814px" preserveAspectRatio="none" style="width:1862px;height:1814px;" version="1.1" viewBox="0 0 1862 1814" width="1862px" zoomAndPan="magnify"><defs><filter height="300%" id="f1u1c8b25aigi3" width="300%" x="-1" y="-1"><feGaussianBlur result="blurOut" stdDeviation="2.0"/><feColorMatrix in="blurOut" result="blurOut2" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .4 0"/><feOffset dx="4.0" dy="4.0" in="blurOut2" result="blurOut3"/><feBlend in="SourceGraphic" in2="blurOut3" mode="normal"/></filter></defs><g><text fill="#000000" font-family="sans-serif" font-size="18" lengthAdjust="spacingAndGlyphs" textLength="332" x="756" y="17.4023">DHCPv4 packet processing (Kea 1.8.0)</text><!--MD5=[91c043391605f0bbc36c648123f05f04]
cluster process--><rect fill="#FFFFFF" filter="url(#f1u1c8b25aigi3)" height="103" style="stroke: #000000; stroke-width: 1.5;" width="849" x="715" y="924.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="257" x="1011" y="939.7344">Process Query on its Message Type</text><!--MD5=[a6437f938727ef6368484703a6d5a51f]
entity processDiscover--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="134" x="1088" y="967.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="114" x="1098" y="990.7344">Process Discover</text><!--MD5=[776f46e8e787ed3ff8f7399fa81d4ef1]
entity processRequest--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="131" x="758.5" y="967.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="111" x="768.5" y="990.7344">Process Request</text><!--MD5=[fc7d6e37f840cd9a10a681e81df6f28b]
entity processRelease--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="128" x="925" y="967.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="108" x="935" y="990.7344">Process Release</text><!--MD5=[8d825f552c438f1d41e38a94f08e3f47]
entity processDecline--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="126" x="1257" y="967.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="106" x="1267" y="990.7344">Process Decline</text><!--MD5=[3b341f45531d1fcf2cf88cb83e9fdef4]
entity processInform--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="122" x="1418" y="967.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="102" x="1428" y="990.7344">Process Inform</text><!--MD5=[aa62c1eea3f70b4dbb2d8a2ad04d8b75]
entity receivePacket--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="114" x="1560" y="28.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="94" x="1570" y="51.7344">Receive query</text><path d="M1471,33.6992 L1471,59.0098 A0,0 0 0 0 1471,59.0098 L1525,59.0098 A0,0 0 0 0 1525,59.0098 L1525,51.6992 L1559.77,46.1992 L1525,43.6992 L1525,43.6992 L1515,33.6992 L1471,33.6992 A0,0 0 0 0 1471,33.6992 " fill="#FBFB77" filter="url(#f1u1c8b25aigi3)" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M1515,33.6992 L1515,43.6992 L1525,43.6992 L1515,33.6992 " fill="#FBFB77" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="33" x="1477" y="51.2676">input</text><!--MD5=[37dd4220ca2f2608029cfa1ef00c2d62]
entity isServiceEnabled--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="127" x="1553.5" y="125.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="107" x="1563.5" y="148.7344">Service Enabled</text><!--MD5=[f1e4a9c8bda8d25100748cfdff400bf1]
entity buffer4_receive--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="179" x="1000.5" y="238.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="159" x="1010.5" y="261.7344">Callout buffer4_receive</text><path d="M1214.5,243.6992 L1214.5,252.1992 L1179.66,256.1992 L1214.5,260.1992 L1214.5,269.0098 A0,0 0 0 0 1214.5,269.0098 L1267.5,269.0098 A0,0 0 0 0 1267.5,269.0098 L1267.5,253.6992 L1257.5,243.6992 L1214.5,243.6992 A0,0 0 0 0 1214.5,243.6992 " fill="#FBFB77" filter="url(#f1u1c8b25aigi3)" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M1257.5,243.6992 L1257.5,253.6992 L1267.5,253.6992 L1257.5,243.6992 " fill="#FBFB77" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="32" x="1220.5" y="261.2676">hook</text><!--MD5=[ce6c3f645c8aec4915456c978c48f6f1]
entity unpack--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="114" x="640" y="351.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="94" x="650" y="374.7344">Unpack query</text><!--MD5=[f8582116def27e35cdbbbf5463e43073]
entity classify--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="115" x="639.5" y="448.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="95" x="649.5" y="471.7344">Classify query</text><!--MD5=[92aee3b8b080bbd52e01e7cb395370c4]
entity pkt4_receive--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="159" x="454.5" y="545.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="139" x="464.5" y="568.7344">Callout pkt4_receive</text><path d="M648.5,550.6992 L648.5,559.1992 L613.59,563.1992 L648.5,567.1992 L648.5,576.0098 A0,0 0 0 0 648.5,576.0098 L701.5,576.0098 A0,0 0 0 0 701.5,576.0098 L701.5,560.6992 L691.5,550.6992 L648.5,550.6992 A0,0 0 0 0 648.5,550.6992 " fill="#FBFB77" filter="url(#f1u1c8b25aigi3)" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M691.5,550.6992 L691.5,560.6992 L701.5,560.6992 L691.5,550.6992 " fill="#FBFB77" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="32" x="654.5" y="568.2676">hook</text><!--MD5=[7aeeef4718a003ce2e7ad9bcbdf71ad9]
entity drop_class--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="141" x="243.5" y="658.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="121" x="253.5" y="681.7344">Check DROP class</text><!--MD5=[a52533196b9ad0f42d77bd2c5acf5304]
entity same_client--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="333" x="147.5" y="755.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="313" x="157.5" y="778.7344">Avoid same client race in multi-threaded mode</text><path d="M587.5,760.6992 L587.5,769.1992 L480.63,773.1992 L587.5,777.1992 L587.5,786.0098 A0,0 0 0 0 587.5,786.0098 L790.5,786.0098 A0,0 0 0 0 790.5,786.0098 L790.5,770.6992 L780.5,760.6992 L587.5,760.6992 A0,0 0 0 0 587.5,760.6992 " fill="#FBFB77" filter="url(#f1u1c8b25aigi3)" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M780.5,760.6992 L780.5,770.6992 L790.5,770.6992 L780.5,760.6992 " fill="#FBFB77" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="182" x="593.5" y="778.2676">postpone processing or drop</text><!--MD5=[a8af8e48f2cc558a0fee70431885f908]
entity leases4_committed--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="197" x="1045.5" y="1098.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="177" x="1055.5" y="1121.7344">Callout leases4_committed</text><path d="M1277.5,1103.6992 L1277.5,1112.1992 L1242.75,1116.1992 L1277.5,1120.1992 L1277.5,1129.0098 A0,0 0 0 0 1277.5,1129.0098 L1330.5,1129.0098 A0,0 0 0 0 1330.5,1129.0098 L1330.5,1113.6992 L1320.5,1103.6992 L1277.5,1103.6992 A0,0 0 0 0 1277.5,1103.6992 " fill="#FBFB77" filter="url(#f1u1c8b25aigi3)" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M1320.5,1103.6992 L1320.5,1113.6992 L1330.5,1113.6992 L1320.5,1103.6992 " fill="#FBFB77" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="32" x="1283.5" y="1121.2676">hook</text><!--MD5=[8e18f13991ca58e5a79e0b81ed56b9db]
entity park--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="50" x="1119" y="1211.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="30" x="1129" y="1234.7344">Park</text><!--MD5=[145fde1089ff11319f35031b66a8b2bf]
entity pkt4_send--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="144" x="943" y="1324.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="124" x="953" y="1347.7344">Callout pkt4_send</text><!--MD5=[62d5b04920c444814fafa1dbf06b35cd]
entity send--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="121" x="1052.5" y="1647.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="101" x="1062.5" y="1670.7344">Send response</text><!--MD5=[5f600c2348a98514851ba709bbd3f597]
entity pack--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="118" x="1077" y="1437.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="98" x="1087" y="1460.7344">Pack response</text><!--MD5=[d6829aa81ee0cd45a2e878b8b13197d5]
entity buffer4_send--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="164" x="1037" y="1534.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="144" x="1047" y="1557.7344">Callout buffer4_send</text><path d="M954.5,1652.6992 L954.5,1678.0098 A0,0 0 0 0 954.5,1678.0098 L1017.5,1678.0098 A0,0 0 0 0 1017.5,1678.0098 L1017.5,1670.6992 L1052.35,1665.1992 L1017.5,1662.6992 L1017.5,1662.6992 L1007.5,1652.6992 L954.5,1652.6992 A0,0 0 0 0 954.5,1652.6992 " fill="#FBFB77" filter="url(#f1u1c8b25aigi3)" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M1007.5,1652.6992 L1007.5,1662.6992 L1017.5,1662.6992 L1007.5,1652.6992 " fill="#FBFB77" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="42" x="960.5" y="1670.2676">output</text><!--MD5=[c92710f32fe9c293a125fb7e80204a05]
entity drop--><rect fill="#FEFECE" filter="url(#f1u1c8b25aigi3)" height="36.4883" style="stroke: #A80036; stroke-width: 1.5;" width="103" x="912.5" y="1744.1992"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="83" x="922.5" y="1767.7344">Drop packet</text><path d="M826.5,1749.6992 L826.5,1775.0098 A0,0 0 0 0 826.5,1775.0098 L877.5,1775.0098 A0,0 0 0 0 877.5,1775.0098 L877.5,1767.6992 L912.49,1762.1992 L877.5,1759.6992 L877.5,1759.6992 L867.5,1749.6992 L826.5,1749.6992 A0,0 0 0 0 826.5,1749.6992 " fill="#FBFB77" filter="url(#f1u1c8b25aigi3)" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M867.5,1749.6992 L867.5,1759.6992 L877.5,1759.6992 L867.5,1749.6992 " fill="#FBFB77" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="30" x="832.5" y="1767.2676">error</text><!--MD5=[9670815d90e482d849702fdd57183fae]
link receivePacket to isServiceEnabled--><path d="M1617,64.6192 C1617,80.1592 1617,102.9792 1617,119.8592 " fill="none" id="receivePacket-&gt;isServiceEnabled" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1617,124.8892,1621,115.8892,1617,119.8892,1613,115.8892,1617,124.8892" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[8b6c78e5054b687dbc9e19308d3a0129]
link isServiceEnabled to buffer4_receive--><path d="M1553.43,157.5892 C1459.11,177.4592 1281.88,214.7792 1176.04,237.0792 " fill="none" id="isServiceEnabled-&gt;buffer4_receive" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1171.05,238.1292,1180.681,240.1893,1175.9427,237.0992,1179.0329,232.3609,1171.05,238.1292" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="112" x="1386" y="204.7676">service is enabled</text><!--MD5=[228411fb88ef1bcdfe7f19b853e215d2]
link isServiceEnabled to drop--><path d="M1655.3,161.3592 C1689.09,179.3992 1733,211.2992 1733,255.1992 C1733,255.1992 1733,255.1992 1733,1666.1992 C1733,1737.9692 1198.66,1756.0992 1020.81,1760.1492 " fill="none" id="isServiceEnabled-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1015.65,1760.2592,1024.7391,1764.0525,1020.6487,1760.145,1024.5562,1756.0546,1015.65,1760.2592" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="116" x="1734" y="896.7676">service is disabled</text><!--MD5=[939988dada0403ed6d1a4e6924dd7701]
link buffer4_receive to unpack--><path d="M1029.46,274.2992 C956.18,294.9992 833.42,329.6692 759.35,350.5892 " fill="none" id="buffer4_receive-&gt;unpack" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="754.1,352.0692,763.8515,353.4505,758.9087,350.6994,761.6598,345.7566,754.1,352.0692" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="67" x="918" y="317.7676">CONTINUE</text><!--MD5=[02f70f5bfef59fd4c02228f0fd276994]
link buffer4_receive to classify--><path d="M1066.12,274.4492 C1047.04,287.8992 1019.38,306.6792 994,321.1992 C907.16,370.8892 800.63,419.7792 741.66,445.8492 " fill="none" id="buffer4_receive-&gt;classify" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="736.8,447.9892,746.6488,448.032,741.3778,445.9784,743.4314,440.7075,736.8,447.9892" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="26" x="940" y="374.2676">SKIP</text><!--MD5=[41e6595d93b5d76e06ef1219c230b624]
link buffer4_receive to drop--><path d="M1179.77,272.9392 C1336.38,300.6992 1643,356.5292 1643,368.1992 C1643,368.1992 1643,368.1992 1643,1666.1992 C1643,1728.8292 1184.07,1752.6892 1020.81,1759.1992 " fill="none" id="buffer4_receive-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1015.59,1759.3992,1024.7431,1763.0353,1020.586,1759.1988,1024.4224,1755.0417,1015.59,1759.3992" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="35" x="1644" y="990.2676">DROP</text><!--MD5=[1ecae68ae42d9a73e40e9217f03f9ce7]
link unpack to classify--><path d="M697,387.6192 C697,403.1592 697,425.9792 697,442.8592 " fill="none" id="unpack-&gt;classify" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="697,447.8892,701,438.8892,697,442.8892,693,438.8892,697,447.8892" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[27fcba0ca5551c2a3eff6088113b3400]
link unpack to drop--><path d="M639.86,372.0692 C474.31,378.2592 6,401.3992 6,465.1992 C6,465.1992 6,465.1992 6,1666.1992 C6,1765.3592 797.05,1728.7492 895,1744.1992 C898.94,1744.8192 902.99,1745.5592 907.05,1746.3692 " fill="none" id="unpack-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="912.2,1747.4292,904.201,1741.6833,907.3044,1746.4129,902.5748,1749.5163,912.2,1747.4292" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="50" x="7" y="1064.7676">on error</text><!--MD5=[6d44324a94e4b11142830ec71aa81556]
link classify to pkt4_receive--><path d="M667.48,484.3992 C639.44,500.7492 597.31,525.2992 567.9,542.4392 " fill="none" id="classify-&gt;pkt4_receive" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="563.3,545.1192,573.0915,544.0576,567.6235,542.6079,569.0733,537.1399,563.3,545.1192" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[0057d53684278b0199141f1c920049f3]
link pkt4_receive to drop_class--><path d="M499.2,581.2692 C481.2,590.1392 458.89,601.1892 439,611.1992 C409.58,626.0092 376.4,643.0092 351.62,655.7692 " fill="none" id="pkt4_receive-&gt;drop_class" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="347.1,658.0992,356.9329,657.5388,351.5461,655.8118,353.2731,650.425,347.1,658.0992" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="67" x="440" y="624.7676">CONTINUE</text><!--MD5=[23d76d484a8ade2f68bc32d339275e55]
link pkt4_receive to drop--><path d="M534,581.4992 C534,603.3392 534,642.0492 534,675.1992 C534,675.1992 534,675.1992 534,1666.1992 C534,1687.5792 558.43,1677.3692 579,1683.1992 C716.63,1722.1692 755.29,1713.5292 895,1744.1992 C899.07,1745.0892 903.27,1746.0492 907.49,1747.0292 " fill="none" id="pkt4_receive-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="912.45,1748.1992,904.6015,1742.2493,907.5822,1747.0572,902.7743,1750.0379,912.45,1748.1992" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="35" x="535" y="1177.7676">DROP</text><!--MD5=[2ba86aae9fb469d61f9b8011ebc0bd96]
link drop_class to same_client--><path d="M314,694.6192 C314,710.1592 314,732.9792 314,749.8592 " fill="none" id="drop_class-&gt;same_client" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="314,754.8892,318,745.8892,314,749.8892,310,745.8892,314,754.8892" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[4eef49efa4e6a39b9cad1f9dd4db75c9]
link drop_class to drop--><path d="M243.48,679.2592 C179.13,685.3592 94,705.9492 94,772.1992 C94,772.1992 94,772.1992 94,1666.1992 C94,1720.9492 161.68,1676.3392 216,1683.1992 C337.59,1698.5492 367.98,1702.7792 490,1714.1992 C669.71,1731.0192 716.75,1715.8392 895,1744.1992 C898.94,1744.8292 902.99,1745.5692 907.05,1746.3792 " fill="none" id="drop_class-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="912.2,1747.4492,904.1976,1741.708,907.3038,1746.4357,902.576,1749.5419,912.2,1747.4492" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="126" x="95" y="1234.2676">query in DROP class</text><!--MD5=[bb9b361438ecdeec2ed5ec34799fad2e]
link same_client to process--><path d="M347.12,791.2092 C395.425,816.0092 488.31,863.6992 569.655,905.4642 C610.3275,926.3467 648.115,945.748 676.0025,960.0661 C689.9463,967.2252 701.415,973.1134 709.5319,977.2807 C711.5611,978.3225 713.3808,979.2568 714.9774,980.0764 " fill="none" id="same_client-&gt;process" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="714.9774,980.0764,708.7978,972.4075,710.5293,977.7928,705.144,979.5244,714.9774,980.0764" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[2de62570b816e5df0f82700c4b296cc3]
link same_client to drop--><path d="M299.7,791.2592 C288.57,806.3092 275,829.3392 275,852.1992 C275,852.1992 275,852.1992 275,1173.6992 C275,1222.3992 247.11,1229.1792 239,1277.1992 C237.74,1284.6492 238.76,1286.6492 239,1294.1992 C239.67,1315.1192 242,1320.2692 242,1341.1992 C242,1341.1992 242,1341.1992 242,1666.1992 C242,1713.3692 777.64,1725.3292 895,1744.1992 C898.94,1744.8292 902.99,1745.5792 907.05,1746.3992 " fill="none" id="same_client-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="912.19,1747.4692,904.2071,1741.7009,907.2973,1746.4392,902.559,1749.5293,912.19,1747.4692" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="267" x="240" y="1290.7676">queries from the same client possible race</text><!--MD5=[3640933a3eded42de606c73d1c2efb26]
link process to drop--><path d="M714.7345,990.1215 C714.4884,990.2441 714.2376,990.3695 713.9823,990.4976 C712.9607,991.0103 711.8653,991.5676 710.703,992.1686 C708.3783,993.3708 705.7858,994.7482 702.9805,996.2952 C691.7591,1002.483 677.1319,1011.383 662.6163,1022.6242 C633.585,1045.1067 605,1076.9542 605,1115.1992 C605,1115.1992 605,1115.1992 605,1286.6992 C605,1382.9192 605,1406.9792 605,1503.1992 C605,1503.1992 605,1503.1992 605,1666.1992 C605,1670.0592 805.92,1721.3092 907.14,1746.8892 " fill="none" id="process-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="912.18,1748.1592,904.4231,1742.0904,907.3301,1746.9432,902.4774,1749.8502,912.18,1748.1592" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="148" x="606" y="1403.7676">unknown message type</text><!--MD5=[952846e6e065ca3396c39be4d5d60980]
link processDiscover to leases4_committed--><path d="M1153.54,1003.3292 C1151.58,1026.3592 1148.08,1067.3592 1145.91,1092.8192 " fill="none" id="processDiscover-&gt;leases4_committed" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1145.47,1097.9992,1150.2261,1089.3749,1145.8982,1093.0176,1142.2555,1088.6897,1145.47,1097.9992" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[7f61b5f2e024f0ea6329d761794804a2]
link processDiscover to drop--><path d="M1178.66,1003.2492 C1195.43,1015.0392 1218.66,1030.7692 1240,1043.1992 C1301.84,1079.1992 1384,1043.6492 1384,1115.1992 C1384,1115.1992 1384,1115.1992 1384,1343.1992 C1384,1405.5792 1346.5,1559.4192 1323,1617.1992 C1310.64,1647.5792 1313.41,1660.2292 1290,1683.1992 C1252.31,1720.1992 1104.17,1743.9392 1021.16,1754.6292 " fill="none" id="processDiscover-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1015.79,1755.3092,1025.2217,1758.1453,1020.7503,1754.6802,1024.2153,1750.2088,1015.79,1755.3092" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="50" x="1380" y="1403.7676">on error</text><!--MD5=[f46ab6743faf3720230dd3ca9adf25a5]
link processRequest to leases4_committed--><path d="M845.36,1003.3592 C861.72,1015.8092 885.26,1032.3292 908,1043.1992 C957.4,1066.8292 1016.32,1084.8192 1062.92,1096.8992 " fill="none" id="processRequest-&gt;leases4_committed" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1067.97,1098.1992,1060.2468,1092.0875,1063.1269,1096.9563,1058.2582,1099.8364,1067.97,1098.1992" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[46780bcbdce00599e22cc2808afc4298]
link processRequest to drop--><path d="M814.47,1003.5592 C802.08,1027.7992 782,1073.5092 782,1115.1992 C782,1115.1992 782,1115.1992 782,1343.1992 C782,1504.6592 842.57,1536.4892 910,1683.1992 C916.56,1697.4792 918.33,1701.0892 927,1714.1992 C932.7,1722.8192 939.57,1731.8492 945.83,1739.6592 " fill="none" id="processRequest-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="949.23,1743.8592,946.6802,1734.3461,946.0857,1739.9717,940.4601,1739.3771,949.23,1743.8592" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="50" x="786" y="1403.7676">on error</text><!--MD5=[dd5280f7a4fbe519a789693377d2c3dc]
link processRelease to leases4_committed--><path d="M1009.58,1003.3292 C1037.95,1026.9392 1089.01,1069.4292 1119.37,1094.6992 " fill="none" id="processRelease-&gt;leases4_committed" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1123.33,1097.9992,1118.9735,1089.1663,1119.4877,1094.7997,1113.8543,1095.3139,1123.33,1097.9992" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[9c1ccee308c843163ae9c7fab5373c87]
link processRelease to drop--><path d="M958.18,1003.1992 C924.12,1024.5192 874,1064.4892 874,1115.1992 C874,1115.1992 874,1115.1992 874,1343.1992 C874,1496.1392 893.83,1533.8992 927,1683.1992 C930.11,1697.2092 930.28,1701.0392 936,1714.1992 C939.7,1722.7092 944.65,1731.5692 949.37,1739.2792 " fill="none" id="processRelease-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="952.26,1743.9092,950.8732,1734.1585,949.6062,1739.6716,944.093,1738.4046,952.26,1743.9092" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="50" x="876" y="1403.7676">on error</text><!--MD5=[762f153a4fd6a7efd08d553c7afbf530]
link processDecline to leases4_committed--><path d="M1296.63,1003.3292 C1264.28,1027.0392 1205.97,1069.7792 1171.54,1095.0092 " fill="none" id="processDecline-&gt;leases4_committed" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1167.47,1097.9992,1177.0921,1095.8981,1171.5007,1095.0405,1172.3582,1089.4491,1167.47,1097.9992" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[6d9fbe084438a9903d341665e19467c6]
link processDecline to drop--><path d="M1344.72,1003.4392 C1388.71,1034.5392 1476,1098.3692 1476,1115.1992 C1476,1115.1992 1476,1115.1992 1476,1666.1992 C1476,1712.0592 1154.4,1744.8992 1020.96,1756.5492 " fill="none" id="processDecline-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1015.91,1756.9892,1025.2195,1760.2037,1020.8916,1756.561,1024.5344,1752.2331,1015.91,1756.9892" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="50" x="1477" y="1403.7676">on error</text><!--MD5=[403b2bcd25ba6f5a11641c975fae6de0]
link processInform to leases4_committed--><path d="M1459.75,1003.3292 C1444.69,1015.9292 1422.73,1032.6492 1401,1043.1992 C1350.13,1067.9092 1289.34,1085.4192 1239.66,1096.9892 " fill="none" id="processInform-&gt;leases4_committed" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1234.58,1098.1592,1244.2506,1100.0248,1239.451,1097.0307,1242.445,1092.2312,1234.58,1098.1592" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[c5223c78dfc731d8a0b6dd3ad2587a32]
link processInform to drop--><path d="M1501,1003.2392 C1527.36,1025.7692 1568,1068.1292 1568,1115.1992 C1568,1115.1992 1568,1115.1992 1568,1666.1992 C1568,1721.2392 1171.5,1749.4592 1021.01,1758.1792 " fill="none" id="processInform-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1015.76,1758.4792,1024.9741,1761.9578,1020.7518,1758.1932,1024.5164,1753.9709,1015.76,1758.4792" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="50" x="1569" y="1403.7676">on error</text><!--MD5=[887612e1a41deb0055e6b261cad7b207]
link leases4_committed to pkt4_send--><path d="M1113.34,1134.3192 C1087.4,1150.5592 1051.56,1177.4592 1033,1211.1992 C1014.26,1245.2592 1012.51,1291.6692 1013.42,1318.8292 " fill="none" id="leases4_committed-&gt;pkt4_send" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1013.63,1323.9992,1017.2398,1314.8358,1013.4153,1319.0038,1009.2472,1315.1793,1013.63,1323.9992" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="67" x="1034" y="1234.2676">CONTINUE</text><!--MD5=[03d4f1b76350f6f230f27d5a69f4e552]
link leases4_committed to drop--><path d="M1215.67,1134.3092 C1261.73,1150.0592 1313,1178.6992 1313,1228.1992 C1313,1228.1992 1313,1228.1992 1313,1399.6992 C1313,1528.5792 1332.51,1582.5492 1252,1683.1992 C1223.32,1719.0492 1096.3,1742.6492 1020.86,1753.7692 " fill="none" id="leases4_committed-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1015.52,1754.5492,1025.0071,1757.1941,1020.4666,1753.8201,1023.8405,1749.2796,1015.52,1754.5492" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="35" x="1315" y="1460.2676">DROP</text><!--MD5=[e6b479318b22374427e5a12769813441]
link leases4_committed to park--><path d="M1144,1134.5392 C1144,1153.7692 1144,1184.8292 1144,1205.8592 " fill="none" id="leases4_committed-&gt;park" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1144,1210.9792,1148,1201.9792,1144,1205.9792,1140,1201.9792,1144,1210.9792" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="32" x="1145" y="1177.7676">PARK</text><!--MD5=[6b0b05ab5b5e01054aa0e3030e86c15b]
link park to pkt4_send--><path d="M1124.13,1247.2992 C1101.18,1267.0392 1063.46,1299.4992 1038.93,1320.6092 " fill="none" id="park-&gt;pkt4_send" style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 7.0,7.0;"/><polygon fill="#A80036" points="1035.11,1323.8992,1044.5412,1321.0616,1038.9002,1320.6382,1039.3236,1314.9972,1035.11,1323.8992" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="44" x="1088" y="1290.7676">unpark</text><!--MD5=[e1e7c40ae99ae9db4be329f6b3cb143f]
link pkt4_send to pack--><path d="M1033.64,1360.2992 C1055.07,1379.9592 1090.25,1412.2292 1113.27,1433.3492 " fill="none" id="pkt4_send-&gt;pack" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1117.14,1436.8992,1113.218,1427.8649,1113.4578,1433.5167,1107.806,1433.7565,1117.14,1436.8992" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="67" x="1083" y="1403.7676">CONTINUE</text><!--MD5=[729fab78839d14d65a522c939ef9b552]
link pkt4_send to buffer4_send--><path d="M1013.6,1360.3192 C1012.24,1386.3092 1012.69,1436.5492 1032,1473.1992 C1044.57,1497.0592 1067.55,1517.1692 1086.73,1530.9992 " fill="none" id="pkt4_send-&gt;buffer4_send" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1091.02,1534.0292,1085.9763,1525.5698,1086.936,1531.1447,1081.3611,1532.1043,1091.02,1534.0292" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="26" x="1033" y="1460.2676">SKIP</text><!--MD5=[7a343c005ca5222349b93a374f6aa4be]
link pkt4_send to drop--><path d="M1008.96,1360.3792 C993.2,1406.2292 951.09,1535.5692 937,1647.1992 C935,1663.0692 934.35,1667.4192 937,1683.1992 C940.27,1702.6292 947.81,1723.6792 954.1,1739.0092 " fill="none" id="pkt4_send-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="956.17,1743.9792,956.39,1734.1328,954.2419,1739.3659,949.0087,1737.2179,956.17,1743.9792" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="35" x="959" y="1557.2676">DROP</text><!--MD5=[e1b3754cee4214144faeedd0f77d1671]
link pack to buffer4_send--><path d="M1132.88,1473.6192 C1130.1,1489.1592 1126.02,1511.9792 1123,1528.8592 " fill="none" id="pack-&gt;buffer4_send" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1122.1,1533.8892,1127.61,1525.7259,1122.973,1528.966,1119.7329,1524.3291,1122.1,1533.8892" style="stroke: #A80036; stroke-width: 1.0;"/><!--MD5=[0fe92c55fb860475c26b6ea914a50894]
link buffer4_send to send--><path d="M1118.06,1570.5392 C1117.02,1589.7692 1115.34,1620.8292 1114.21,1641.8592 " fill="none" id="buffer4_send-&gt;send" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1113.93,1646.9792,1118.412,1638.2093,1114.201,1641.9866,1110.4237,1637.7756,1113.93,1646.9792" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="67" x="1117" y="1613.7676">CONTINUE</text><!--MD5=[887aa11356841167329c21249679272f]
link buffer4_send to drop--><path d="M1161.34,1570.3192 C1173.8,1577.5792 1185.96,1587.3992 1193,1600.1992 C1201.95,1616.4792 1222.86,1639.9692 1191,1683.1992 C1151.85,1736.3392 1074.24,1753.5792 1020.76,1758.9992 " fill="none" id="buffer4_send-&gt;drop" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1015.66,1759.4892,1025.0054,1762.5977,1020.6364,1759.0044,1024.2297,1754.6354,1015.66,1759.4892" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="35" x="1208" y="1670.2676">DROP</text><!--MD5=[6b25e4fe160ab604f67b02c1ded86970]
link send to drop--><text fill="#888888" font-family="sans-serif" font-size="10" lengthAdjust="spacingAndGlyphs" textLength="225" x="809.5" y="1801.3555">dashed arrow means asynchronous processing</text><!--MD5=[3241bf81dfc1d82f66e0faca3c9d8456]
@startuml

title DHCPv4 packet processing (Kea 1.8.0)

agent "Receive query" as receivePacket
note left : input

agent "Service Enabled" as isServiceEnabled

agent "Callout buffer4_receive" as buffer4_receive
note right : hook

agent "Unpack query" as unpack

agent "Classify query" as classify

agent "Callout pkt4_receive" as pkt4_receive
note right : hook

agent "Check DROP class" as drop_class

agent "Avoid same client race in multi-threaded mode" as same_client
note right : postpone processing or drop

rectangle "Process Query on its Message Type" as process {
 agent "Process Discover" as processDiscover
 agent "Process Request" as processRequest
 agent "Process Release" as processRelease
 agent "Process Decline" as processDecline
 agent "Process Inform" as processInform
}

agent "Callout leases4_committed" as leases4_committed
note right : hook

agent "Park" as park

agent "Callout pkt4_send" as pkt4_send

agent "Send response" as send

agent "Pack response" as pack

agent "Callout buffer4_send" as buffer4_send

agent "Send response" as send
note left : output

agent "Drop packet" as drop
note left : error

receivePacket - -> isServiceEnabled
isServiceEnabled - -> buffer4_receive : service is enabled
isServiceEnabled - - - -> drop : service is disabled
buffer4_receive - -> unpack : CONTINUE
buffer4_receive - -> classify : SKIP
buffer4_receive - - - -> drop : DROP
unpack - -> classify
unpack - - -> drop : on error
classify - -> pkt4_receive
pkt4_receive - -> drop_class : CONTINUE
pkt4_receive - - -> drop : DROP
drop_class - -> same_client
drop_class - - -> drop : query in DROP class
same_client - - -> process
same_client - - -> drop : queries from the same client possible race
process - - -> drop : unknown message type
processDiscover - -> leases4_committed
processDiscover - - -> drop : on error
processRequest - -> leases4_committed
processRequest - - -> drop : on error
processRelease - -> leases4_committed
processRelease - - -> drop : on error
processDecline - -> leases4_committed
processDecline - - -> drop : on error
processInform - -> leases4_committed
processInform - - -> drop : on error
leases4_committed - -> pkt4_send : CONTINUE
leases4_committed - - -> drop : DROP
leases4_committed - -> park : PARK
park -[dashed]-> pkt4_send : unpark
pkt4_send - -> pack : CONTINUE
pkt4_send - -> buffer4_send : SKIP
pkt4_send - - -> drop : DROP
pack - -> buffer4_send
buffer4_send - -> send : CONTINUE
buffer4_send - - -> drop : DROP
send -[hidden]-> drop

footer dashed arrow means asynchronous processing

@enduml

PlantUML version 1.2020.15(Sun Jun 28 13:39:45 CEST 2020)
(GPL source distribution)
Java Runtime: OpenJDK Runtime Environment
JVM: OpenJDK 64-Bit Server VM
Default Encoding: UTF-8
Language: en
Country: US
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