checksum

Documentation

Overview

Package checksum provides functions for updating checksums in parsed packets.

Index

• func UpdateDstAddr(q *packet.Parsed, dst netip.Addr)
• func UpdateSrcAddr(q *packet.Parsed, src netip.Addr)

Functions

func UpdateDstAddr

func UpdateDstAddr(q *packet.Parsed, dst netip.Addr)

UpdateDstAddr updates the destination address in the packet buffer (e.g. during DNAT). It also updates the checksum. Currently (2022-12-10) only TCP/UDP/ICMP is supported. It panics if provided with an address in a different family to the parsed packet.

func UpdateSrcAddr

func UpdateSrcAddr(q *packet.Parsed, src netip.Addr)

UpdateSrcAddr updates the source address in the packet buffer (e.g. during SNAT). It also updates the checksum. Currently (2023-09-22) only TCP/UDP/ICMP is supported. It panics if provided with an address in a different family to the parsed packet.