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Click

Click

Click is a pl created in 1999.

#207on PLDB 23Years Old 1.8kUsers
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The Click modular router: fast modular packet processing and analysis


Example from Linguist:
rates :: AvailableRates elementclass sr2 { $sr2_ip, $sr2_nm, $wireless_mac, $gateway, $probes| arp :: ARPTable(); lt :: LinkTable(IP $sr2_ip); gw :: SR2GatewaySelector(ETHTYPE 0x062c, IP $sr2_ip, ETH $wireless_mac, LT lt, ARP arp, PERIOD 15, GW $gateway); gw -> SR2SetChecksum -> [0] output; set_gw :: SR2SetGateway(SEL gw); es :: SR2ETTStat(ETHTYPE 0x0641, ETH $wireless_mac, IP $sr2_ip, PERIOD 30000, TAU 300000, ARP arp, PROBES $probes, ETT metric, RT rates); metric :: SR2ETTMetric(LT lt); forwarder :: SR2Forwarder(ETHTYPE 0x0643, IP $sr2_ip, ETH $wireless_mac, ARP arp, LT lt); querier :: SR2Querier(ETH $wireless_mac, SR forwarder, LT lt, ROUTE_DAMPENING true, TIME_BEFORE_SWITCH 5, DEBUG true); query_forwarder :: SR2MetricFlood(ETHTYPE 0x0644, IP $sr2_ip, ETH $wireless_mac, LT lt, ARP arp, DEBUG false); query_responder :: SR2QueryResponder(ETHTYPE 0x0645, IP $sr2_ip, ETH $wireless_mac, LT lt, ARP arp, DEBUG true); query_responder -> SR2SetChecksum -> [0] output; query_forwarder -> SR2SetChecksum -> SR2Print(forwarding) -> [0] output; query_forwarder [1] -> query_responder; data_ck :: SR2SetChecksum() input [1] -> host_cl :: IPClassifier(dst net $sr2_ip mask $sr2_nm, -) -> querier -> data_ck; host_cl [1] -> [0] set_gw [0] -> querier; forwarder[0] -> dt ::DecIPTTL -> data_ck -> [2] output; dt[1] -> Print(ttl-error) -> ICMPError($sr2_ip, timeexceeded, 0) -> querier; // queries querier [1] -> [1] query_forwarder; es -> SetTimestamp() -> [1] output; forwarder[1] //ip packets to me -> SR2StripHeader() -> CheckIPHeader() -> from_gw_cl :: IPClassifier(src net $sr2_ip mask $sr2_nm, -) -> [3] output; from_gw_cl [1] -> [1] set_gw [1] -> [3] output; input [0] -> ncl :: Classifier( 12/0643 , //sr2_forwarder 12/0644 , //sr2 12/0645 , //replies 12/0641 , //sr2_es 12/062c , //sr2_gw ); ncl[0] -> SR2CheckHeader() -> [0] forwarder; ncl[1] -> SR2CheckHeader() -> PrintSR(query) -> query_forwarder ncl[2] -> SR2CheckHeader() -> query_responder; ncl[3] -> es; ncl[4] -> SR2CheckHeader() -> gw; } Idle -> s :: sr2(2.0.0.1, 255.0.0.0, 00:00:00:00:00:01, false, "12 60 12 1500") -> Discard; Idle -> [1] s; s[1] -> Discard; s[2] -> Discard; s[3] -> Discard;

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