D23461.id82827.diff
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	diff --git a/share/man/man4/ng_nat.4 b/share/man/man4/ng_nat.4
	--- a/share/man/man4/ng_nat.4
	+++ b/share/man/man4/ng_nat.4
	@@ -24,7 +24,7 @@
	.\"
	.\" $FreeBSD$
	.\"
	-.Dd December 12, 2018
	+.Dd January 24, 2021
	.Dt NG_NAT 4
	.Os
	.Sh NAME
	@@ -75,7 +75,13 @@
	#define NG_NAT_RESET_ON_ADDR_CHANGE 0x20
	#define NG_NAT_PROXY_ONLY 0x40
	#define NG_NAT_REVERSE 0x80
	+#define NG_NAT_UNREGISTERED_CGN 0x100
	.Ed
	+.Pp
	+The corresponding libalias flags can be found by replacing the
	+.Vt "NG_NAT"
	+prefix with
	+.Vt "PKT_ALIAS" .
	.It Dv NGM_NAT_SET_TARGET Pq Ic settarget
	Configure target address for a node.
	When an incoming packet not associated with any pre-existing aliasing
	diff --git a/sys/netgraph/ng_nat.h b/sys/netgraph/ng_nat.h
	--- a/sys/netgraph/ng_nat.h
	+++ b/sys/netgraph/ng_nat.h
	@@ -54,6 +54,7 @@
	#define NG_NAT_RESET_ON_ADDR_CHANGE 0x20
	#define NG_NAT_PROXY_ONLY 0x40
	#define NG_NAT_REVERSE 0x80
	+#define NG_NAT_UNREGISTERED_CGN 0x100

	#define NG_NAT_DESC_LENGTH 64
	#define NG_NAT_REDIRPROTO_ADDR (IPPROTO_MAX + 3) /* LibAlias' LINK_ADDR, also unused in in.h */
	diff --git a/sys/netgraph/ng_nat.c b/sys/netgraph/ng_nat.c
	--- a/sys/netgraph/ng_nat.c
	+++ b/sys/netgraph/ng_nat.c
	@@ -961,6 +961,8 @@
	res \|= PKT_ALIAS_PROXY_ONLY;
	if (x & NG_NAT_REVERSE)
	res \|= PKT_ALIAS_REVERSE;
	+ if (x & NG_NAT_UNREGISTERED_CGN)
	+ res \|= PKT_ALIAS_UNREGISTERED_CGN;

	return (res);
	}