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hotfix(pmtud/tcp): fix code for IPv6 destinations

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This commit is contained in:
Quentin McGaw
2026-02-20 16:23:40 +00:00
parent 73b3e2c88a
commit c66d8bed00
8 changed files with 21 additions and 39 deletions
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internal/pmtud/tcp/packet.go
+15 -5
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@@ -65,13 +65,15 @@ func createPacket(src, dst netip.AddrPort,
if dst.Addr().Is4() {
ipHeader = ip.HeaderV4(src.Addr(), dst.Addr(), payloadLength)
} else {
// Pseudo-header, this is actually not part of the packet since
// the kernel will calculate and add it itself to the packet;
// it is only used for calculating the TCP checksum.
ipHeader = ip.HeaderV6(src.Addr(), dst.Addr(),
uint16(payloadLength), byte(constants.IPPROTO_TCP)) //nolint:gosec
}
tcpHeader := makeTCPHeader(src.Port(), dst.Port(), seq, ack, flags)
// data is just zeroes
dataLength := int(payloadLength - constants.BaseTCPHeaderLength)
var data []byte
if dataLength > 0 {
@@ -81,10 +83,18 @@ func createPacket(src, dst netip.AddrPort,
tcpHeader[16] = byte(checksum >> 8) //nolint:mnd
tcpHeader[17] = byte(checksum & 0xff) //nolint:mnd
packet := make([]byte, len(ipHeader)+int(constants.BaseTCPHeaderLength)+dataLength)
copy(packet, ipHeader)
copy(packet[len(ipHeader):], tcpHeader)
copy(packet[len(ipHeader)+int(constants.BaseTCPHeaderLength):], data)
var packet []byte
i := 0
if dst.Addr().Is4() {
packet = make([]byte, len(ipHeader)+int(constants.BaseTCPHeaderLength)+dataLength)
copy(packet, ipHeader)
i += len(ipHeader)
} else {
packet = make([]byte, int(constants.BaseTCPHeaderLength)+dataLength)
}
copy(packet[i:], tcpHeader)
i += int(constants.BaseTCPHeaderLength)
copy(packet[i:], data)
return packet
}