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fix TCP checksum in internet.StackBasic; more logging

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soypat
2025-05-27 23:37:21 -03:00
parent a967f083cb
commit 20946c7e22
7 changed files with 133 additions and 35 deletions
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lneto_test.go
+34
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@@ -5,6 +5,7 @@ import (
"math/rand"
"testing"
"github.com/soypat/lneto"
"github.com/soypat/lneto/ethernet"
"github.com/soypat/lneto/internal/ltesto"
"github.com/soypat/lneto/ipv4"
@@ -114,3 +115,36 @@ func testMoveTCPPacket(t *testing.T, src, dst []byte) {
t.Fatalf("payload mismatch %d %d", len(payload), len(tfrm2.Payload()))
}
}
func TestIPv4TCPChecksum(t *testing.T) {
var tcpPackets = [][]byte{
{0xc0, 0xff, 0xee, 0x00, 0xde, 0xad, 0x4e, 0x8b, 0x3a, 0xf9, 0xfb, 0x6b, 0x08, 0x00, 0x45, 0x00,
0x00, 0x3c, 0x01, 0xbe, 0x40, 0x00, 0x40, 0x06, 0xa3, 0xaa, 0xc0, 0xa8, 0x0a, 0x01, 0xc0, 0xa8,
0x0a, 0x02, 0xe7, 0x0a, 0x00, 0x50, 0x40, 0x60, 0xd5, 0xcc, 0x00, 0x00, 0x00, 0x00, 0xa0, 0x02,
0xfa, 0xf0, 0x62, 0xbc, 0x00, 0x00, 0x02, 0x04, 0x05, 0xb4, 0x04, 0x02, 0x08, 0x0a, 0xbb, 0xac,
0x9b, 0xca, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x07},
{0xc0, 0xff, 0xee, 0x00, 0xde, 0xad, 0x4e, 0x8b, 0x3a, 0xf9, 0xfb, 0x6b, 0x08, 0x00, 0x45, 0x00,
0x00, 0x3c, 0xfa, 0xfd, 0x40, 0x00, 0x40, 0x06, 0xaa, 0x6a, 0xc0, 0xa8, 0x0a, 0x01, 0xc0, 0xa8,
0x0a, 0x02, 0xe7, 0x0e, 0x00, 0x50, 0x9c, 0xdc, 0xfe, 0x05, 0x00, 0x00, 0x00, 0x00, 0xa0, 0x02,
0xfa, 0xf0, 0xde, 0x02, 0x00, 0x00, 0x02, 0x04, 0x05, 0xb4, 0x04, 0x02, 0x08, 0x0a, 0xbb, 0xac,
0x9b, 0xca, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x07},
}
for _, tcpPacket := range tcpPackets {
efrm, _ := ethernet.NewFrame(tcpPacket)
ifrm, _ := ipv4.NewFrame(efrm.Payload())
tfrm, _ := tcp.NewFrame(ifrm.Payload())
wantCRC := ifrm.CRC()
gotCRC := ifrm.CalculateHeaderCRC()
if wantCRC != gotCRC {
t.Errorf("IPv4 CRC miscalculated. want %x, got %x", wantCRC, gotCRC)
}
wantCRC = tfrm.CRC()
var crc lneto.CRC791
ifrm.CRCWriteTCPPseudo(&crc)
tfrm.CRCWrite(&crc)
gotCRC = crc.Sum16()
if wantCRC != gotCRC {
t.Errorf("TCP CRC miscalculated. want %x, got %x", wantCRC, gotCRC)
}
}
}