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tun: export optimized IP checksum funcs

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External implementers of tun.Device may support GRO, requiring checksum
offload.

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited 2024-07-23 13:34:34 -07:00 • committed by Jordan Whited
parent 60eeedfd62
commit 6c039a188c
5 changed files with 23 additions and 18 deletions
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4
tun/checksum.go
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@ -702,7 +702,9 @@ func pseudoHeaderChecksum32(protocol uint8, srcAddr, dstAddr []byte, totalLen ui
return foldedSum
}
func pseudoHeaderChecksum(protocol uint8, srcAddr, dstAddr []byte, totalLen uint16) uint16 {
// PseudoHeaderChecksum computes an IP pseudo-header checksum. srcAddr and
// dstAddr must be 4 or 16 bytes in length.
func PseudoHeaderChecksum(protocol uint8, srcAddr, dstAddr []byte, totalLen uint16) uint16 {
if strconv.IntSize < 64 {
return pseudoHeaderChecksum32(protocol, srcAddr, dstAddr, totalLen)
}