References: golang.org/x/sys/unix.RTNLGRP_IPV6

const golang.org/x/sys/unix.RTNLGRP_IPV6_PREFIX

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L3102: 	RTNLGRP_IPV6_PREFIX   = 0x12

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