net-defragmenter

Introduction

This is a network fragmentation reassembly library that now supports fragments of IPV4 and IPV6 types.
By fast detecting data packets (no copy memory, no use 'gopacket.NewPacket'), balancing group collection, concurrent defragmentation, object reuse, and other operations,
a good level of performance can be achieved.

Directory structure description

definition

This directory mainly contains some public macro definitions and some public structures.

example

This directory mainly contains some demonstration examples.

fragadapter

This is a demonstration of the adapter, which demonstrates how to use net-delimiter library. This adapter is just a demonstration example, you don't need to follow this demonstration example to use the library.

internal

This directory mainly contains internal implementations that cannot be referenced.

libstats

Stats data related

manager

The instance of the library is related, and this instance is exposed to users for use.

Simple Test Report Reference

Performance

In a CPU @ 3.20GHz 3.19 GHz 4 threads environment, replay a pcap file with 102146 packets took 473 milliseconds, and restructuring 61277 fragments of the file took 458 milliseconds.

Stats

The description will be supplemented later.

{
	"Enabled": true,
	"Detection": {
		"TotalReceivedPktNum": 102146,
		"TotalLinkLayerErrNum": 0,
		"TotalHandleNilErrNum": 0,
		"ErrStats": {
			"TotalNewPacketErrNum": 0,
			"TotalSerializeLayersErrNum": 0,
			"TotalFullPacketBufAppendBytesErrNum": 0,
			"TotalIPV4HdrLenInsufficient": 0,
			"TotalIPv6NetWorkerLayerNilNum": 0,
			"TotalIPV6HdrLenInsufficientNum": 0,
			"TotalIPV6FragHdrLenInsufficientNum": 0,
			"TotalUnhandledErrNum": 0
		},
		"TotalPickFragTypeNotExistsNum": 39343,
		"TotalFilterAppLayerErrNum": 0,
		"TotalDetectPassedNum": 61277
	},
	"Collection": {
		"TotalDistributeFragmentFailureNum": 0,
		"TotalNewFragmentElementNum": 61277,
		"TotalAllocateFragmentElementNum": 1197,
		"TotalRecycleFragmentElementNum": 61277,
		"TotalAcceptFragmentElementNum": 61277,
		"TotalHandleNilErrNum": 0,
		"CollectErrStats": {
			"TotalNewPacketErrNum": 0,
			"TotalSerializeLayersErrNum": 0,
			"TotalFullPacketBufAppendBytesErrNum": 0,
			"TotalIPV4HdrLenInsufficient": 0,
			"TotalIPv6NetWorkerLayerNilNum": 0,
			"TotalIPV6HdrLenInsufficientNum": 0,
			"TotalIPV6FragHdrLenInsufficientNum": 0,
			"TotalUnhandledErrNum": 0
		},
		"TotalAcceptFragSuccessfulNum": 61277,
		"ReassemblyErrStats": {
			"TotalNewPacketErrNum": 0,
			"TotalSerializeLayersErrNum": 0,
			"TotalFullPacketBufAppendBytesErrNum": 0,
			"TotalIPV4HdrLenInsufficient": 0,
			"TotalIPv6NetWorkerLayerNilNum": 0,
			"TotalIPV6HdrLenInsufficientNum": 0,
			"TotalIPV6FragHdrLenInsufficientNum": 0,
			"TotalUnhandledErrNum": 0
		},
		"TotalNewFragGroupNum": 16659,
		"TotalDelFragGroupNotExistNum": 0,
		"TotalReleaseFragGroupThReassemblyNum": 16659,
		"TotalReleaseFragGroupThExpiredNum": 0,
		"TotalReassemblyFragNum": 61277,
		"TotalPushFullPktNum": 16659,
		"TotalPopFullPktNum": 16659,
		"TotalReleaseFullPktNum": 0
	}
}

Memory Status

The following comparison shows that there is no memory leak.

Initial memory state

{
  "Alloc": "Alloc MBs=1, KBs=1160, Bs=1188464",
  "TotalAlloc": "TotalAlloc MBs=1",
  "Sys": "TotalAlloc MBs=6",
  "Mallocs": 2853,
  "Frees": 110,
  "HeapAlloc": "HeapAlloc MBs=1",
  "HeapSys": "HeapSys MBs=3",
  "HeapInuse": "HeapInuse MBs=2",
  "HeapReleased": "HeapReleased MBs=1",
  "NextGC": "NextGC MBs=5",
  "GCCPUFraction": 0,
  "NumForcedGC": 0
}

Peak memory status

{
	"Alloc": "Alloc MBs=133, KBs=136759, Bs=140041912",
	"TotalAlloc": "TotalAlloc MBs=364",
	"Sys": "TotalAlloc MBs=150",
	"Mallocs": 1717504,
	"Frees": 1283353,
	"HeapAlloc": "HeapAlloc MBs=133",
	"HeapSys": "HeapSys MBs=139",
	"HeapInuse": "HeapInuse MBs=138",
	"HeapReleased": "HeapReleased MBs=1",
	"NextGC": "NextGC MBs=153",
	"GCCPUFraction": 0.06129849919264683,
	"NumForcedGC": 0
}

Memory status after garbage collection

{
	"Alloc": "Alloc MBs=1, KBs=1283, Bs=1314176",
	"TotalAlloc": "TotalAlloc MBs=365",
	"Sys": "TotalAlloc MBs=154",
	"Mallocs": 1717664,
	"Frees": 1715580,
	"HeapAlloc": "HeapAlloc MBs=1",
	"HeapSys": "HeapSys MBs=143",
	"HeapInuse": "HeapInuse MBs=2",
	"HeapReleased": "HeapReleased MBs=132",
	"NextGC": "NextGC MBs=8",
	"GCCPUFraction": 0.0009613584960369672,
	"NumForcedGC": 3
}