freebsd-new.diff
schoen_loyalty.org (Seth Schoen)
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	schoen_loyalty.org
	Sep 5 2021, 3:24 AM

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freebsd-new.diff
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	diff --git a/sys/netinet/in.c b/sys/netinet/in.c
	index d1dd2b31b6ef..2794fc068f09 100644
	--- a/sys/netinet/in.c
	+++ b/sys/netinet/in.c
	@@ -81,6 +81,12 @@ static void in_purgemaddrs(struct ifnet *);

	static bool ia_need_loopback_route(const struct in_ifaddr *);

	+static bool subnet_addr_is_broadcast = 1;
	+
	+SYSCTL_BOOL(_net_inet_ip, OID_AUTO, subnet_addr_is_broadcast, CTLFLAG_RW,
	+ &subnet_addr_is_broadcast, true,
	+ "Treat IPv4 subnet address as a broadcast address");
	+
	VNET_DEFINE_STATIC(int, nosameprefix);
	#define V_nosameprefix VNET(nosameprefix)
	SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET \| CTLFLAG_RW,
	@@ -1137,9 +1143,11 @@ in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
	/*
	* Check for old-style (host 0) broadcast, but
	* taking into account that RFC 3021 obsoletes it.
	+ * Also gated by subnet_addr_is_broadcast sysctl.
	*/
	(ia->ia_subnetmask != IN_RFC3021_MASK &&
	- ntohl(in.s_addr) == ia->ia_subnet)) &&
	+ ntohl(in.s_addr) == ia->ia_subnet &&
	+ subnet_addr_is_broadcast)) &&
	/*
	* Check for an all one subnetmask. These
	* only exist when an interface gets a secondary