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Add tailscale checksum

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世界 2024-11-22 15:45:38 +08:00
parent 4ebeb2fa86
commit 06b4d4ecd1
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GPG key ID: CD109927C34A63C4
11 changed files with 2254 additions and 28 deletions
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28
internal/gtcpip/checksum/checksum.go
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@ -30,34 +30,6 @@ func Put(b []byte, xsum uint16) {
binary.BigEndian.PutUint16(b, xsum)
}
// Checksum calculates the checksum (as defined in RFC 1071) of the bytes in the
// given byte array. This function uses an optimized version of the checksum
// algorithm.
//
// The initial checksum must have been computed on an even number of bytes.
func Checksum(buf []byte, initial uint16) uint16 {
s, _ := calculateChecksum(buf, false, initial)
return s
}
// Checksumer calculates checksum defined in RFC 1071.
type Checksumer struct {
sum uint16
odd bool
}
// Add adds b to checksum.
func (c *Checksumer) Add(b []byte) {
if len(b) > 0 {
c.sum, c.odd = calculateChecksum(b, c.odd, c.sum)
}
}
// Checksum returns the latest checksum value.
func (c *Checksumer) Checksum() uint16 {
return c.sum
}
// Combine combines the two uint16 to form their checksum. This is done
// by adding them and the carry.
//