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68f983ba41
Backport patch from kernel 5.14. Treat only the highest, not the lowest, IPv4 address within a local subnet as a broadcast address, as subnets do not need two different broadcast addresses and networking documentation consistently prefers the highest address as broadcast. This patch was merged in upstream net-next tree in May 2021 at https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=94c821c74bf5 This eventually frees up one address per subnet. It matches behavior suggested in our Internet-Draft, and also the default behavior of OpenBSD and FreeBSD. Signed-off-by: Seth David Schoen <schoen@loyalty.org>