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Added logic to decode flow end reason and selector metrics for Netflow Lite

This commit is contained in:
Pavel Odintsov 2021-01-23 14:56:11 +00:00
parent 82b3154aaa
commit e3253963c0
1 changed files with 73 additions and 0 deletions
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73
src/netflow_plugin/netflow_collector.cpp
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@ -848,6 +848,57 @@ int nf9_rec_to_flow(uint32_t record_type, uint32_t record_length, uint8_t* data,
}
break;
case NF9_FORWARDING_STATUS:
// Documented here: https://www.cisco.com/en/US/technologies/tk648/tk362/technologies_white_paper09186a00800a3db9.html
// Forwarding status is encoded on 1 byte with the 2 left bits giving the status and the 6 remaining bits giving the reason code.
// This field may carry information about fragmentation but we cannot confirm it, ASR 9000 exports most of the traffic with field 64, which means unknown
if (record_length == 1) {
uint8_t forwarding_status = 0;
memcpy(&forwarding_status, data, record_length);
// logger << log4cpp::Priority::ERROR << "Forwarding status: " << int(forwarding_status);
} else {
// It must be exactly one byte
}
break;
case NF9_SELECTOR_TOTAL_PACKETS_OBSERVED:
if (record_length == 8) {
uint64_t packets_observed = 0;
memcpy(&packets_observed, data, record_length);
flow_meta.observed_packets = fast_ntoh(packets_observed);
} else {
// We do not support other length
}
break;
case NF9_SELECTOR_TOTAL_PACKETS_SELECTED:
if (record_length == 8) {
uint64_t packets_selected = 0;
memcpy(&packets_selected, data, record_length);
flow_meta.selected_packets = fast_ntoh(packets_selected);
} else {
// We do not support other length
}
break;
case NF9_DATALINK_FRAME_SIZE:
if (record_length == 2) {
uint16_t datalink_frame_size = 0;
memcpy(&datalink_frame_size, data, record_length);
flow_meta.data_link_frame_size = fast_ntoh(datalink_frame_size);
} else {
// We do not support other length
}
break;
case NF9_LAYER2_PACKET_SECTION_DATA:
// Netflow Lite parser logic
break;
}
return 0;
@ -1009,6 +1060,28 @@ bool nf10_rec_to_flow(uint32_t record_type, uint32_t record_length, uint8_t* dat
}
break;
case NF10_FLOW_END_REASON:
// It should be 1 byte value
if (record_length == 1) {
uint8_t flow_end_reason = 0;
memcpy(&flow_end_reason, data, record_length);
// https://www.iana.org/assignments/ipfix/ipfix.xhtml#ipfix-flow-end-reason
if (flow_end_reason == 1) {
ipfix_flows_end_reason_idle_timeout++;
} else if (flow_end_reason == 2) {
ipfix_flows_end_reason_active_timeout++;
} else if (flow_end_reason == 3) {
ipfix_flows_end_reason_end_of_flow_timeout++;
} else if (flow_end_reason == 4) {
ipfix_flows_end_reason_force_end_timeout++;
} else if (flow_end_reason == 5) {
ipfix_flows_end_reason_lack_of_resource_timeout++;
}
}
break;
}
return true;