From bd543db86b59dfec20975d4932c0889b9c2211cf Mon Sep 17 00:00:00 2001 From: Christof Schulze Date: Fri, 23 Aug 2019 20:42:23 +0200 Subject: [PATCH] gluon-core: enhance mac_to_ip() beyond RFC 4291 (#1798) mac_to_ip() calculates an ipv6 address from a mac address according to RFC 4291. For wireguard we have to use specially crafted addresses that must be unique. This allows calculating such unique mac-based addresses by allowing to optionally specifying the bytes to be inserted into the address. --- package/gluon-core/luasrc/usr/lib/lua/gluon/iputil.lua | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/package/gluon-core/luasrc/usr/lib/lua/gluon/iputil.lua b/package/gluon-core/luasrc/usr/lib/lua/gluon/iputil.lua index c0fe93ce..266ede38 100644 --- a/package/gluon-core/luasrc/usr/lib/lua/gluon/iputil.lua +++ b/package/gluon-core/luasrc/usr/lib/lua/gluon/iputil.lua @@ -74,10 +74,10 @@ function M.IPv6(address) end end -function M.mac_to_ip(prefix, mac) +function M.mac_to_ip(prefix, mac, firstbyte, secondbyte) local m1, m2, m3, m6, m7, m8 = string.match(mac, '(%x%x):(%x%x):(%x%x):(%x%x):(%x%x):(%x%x)') - local m4 = 0xff - local m5 = 0xfe + local m4 = firstbyte or 0xff + local m5 = secondbyte or 0xfe m1 = bit.bxor(tonumber(m1, 16), 0x02) local h1 = 0x100 * m1 + tonumber(m2, 16)