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Add system stack

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世界 2022-09-06 19:24:47 +08:00
parent 0efafc9963
commit 2f15b0cd3f
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GPG key ID: CD109927C34A63C4
26 changed files with 1713 additions and 79 deletions
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24
internal/clashtcpip/tcpip.go Normal file
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@ -0,0 +1,24 @@
package clashtcpip
var zeroChecksum = [2]byte{0x00, 0x00}
var SumFnc = SumCompat
func Sum(b []byte) uint32 {
return SumFnc(b)
}
// Checksum for Internet Protocol family headers
func Checksum(sum uint32, b []byte) (answer [2]byte) {
sum += Sum(b)
sum = (sum >> 16) + (sum & 0xffff)
sum += sum >> 16
sum = ^sum
answer[0] = byte(sum >> 8)
answer[1] = byte(sum)
return
}
func SetIPv4(packet []byte) {
packet[0] = (packet[0] & 0x0f) | (4 << 4)
}