References: syscall.IPV6_XFRM

const syscall.IPV6_XFRM_POLICY

one use

	syscall (current package)
		zerrors_linux_amd64.go#L424: 	IPV6_XFRM_POLICY                 = 0x23

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)