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huge tap/bridge overhaul; udp node; dhcp node; DHCP example

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soypat
2025-06-15 18:01:04 -03:00
parent 29ac9a3a1a
commit dcc7a95e62
16 changed files with 706 additions and 157 deletions
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internet/pcap/capture.go
+14 -1
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@@ -208,6 +208,11 @@ func (pc *PacketBreakdown) CaptureIPv4(dst []Frame, pkt []byte, bitOffset int) (
ifrm4.CRCWriteTCPPseudo(&crc)
tfrm, err := tcp.NewFrame(ifrm4.Payload())
if err == nil {
tfrm.ValidateSize(pc.validator())
if pc.vld.HasError() {
println("BAD TCP")
return dst, pc.vld.ErrPop()
}
tfrm.CRCWrite(&crc)
wantSum := crc.Sum16()
gotSum := tfrm.CRC()
@@ -215,10 +220,15 @@ func (pc *PacketBreakdown) CaptureIPv4(dst []Frame, pkt []byte, bitOffset int) (
protoErrs = append(protoErrs, &crcError16{protocol: "ipv4+tcp", want: wantSum, got: gotSum})
}
}
} else if proto == lneto.IPProtoUDP || proto == lneto.IPProtoUDPLite {
} else if proto == lneto.IPProtoUDP {
ifrm4.CRCWriteUDPPseudo(&crc)
ufrm, err := udp.NewFrame(ifrm4.Payload())
if err == nil {
ufrm.ValidateSize(pc.validator())
if pc.vld.HasError() {
println("BAD UDP")
return dst, pc.vld.ErrPop()
}
ufrm.CRCWriteIPv4(&crc)
wantSum := crc.Sum16()
gotSum := ufrm.CRC()
@@ -289,6 +299,9 @@ func (pc *PacketBreakdown) CaptureTCP(dst []Frame, pkt []byte, bitOffset int) ([
return dst, nil
}
// func (pc *PacketBreakdown) CaptureDHCPv4(dst []Frame, pkt []byte, bitOffset int) ([]Frame, error) {
// }
func (pc *PacketBreakdown) CaptureUDP(dst []Frame, pkt []byte, bitOffset int) ([]Frame, error) {
if bitOffset%8 != 0 {
return dst, errors.New("UDP must be parsed at byte boundary")