D47785.diff
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	diff --git a/sys/netinet/in.c b/sys/netinet/in.c
	--- a/sys/netinet/in.c
	+++ b/sys/netinet/in.c
	@@ -441,6 +441,27 @@
	return (error);
	}

	+int
	+in_mask2len(struct in_addr *mask)
	+{
	+ int x, y;
	+ u_char *p;
	+
	+ p = (u_char *)mask;
	+ for (x = 0; x < sizeof(*mask); x++) {
	+ if (p[x] != 0xff)
	+ break;
	+ }
	+ y = 0;
	+ if (x < sizeof(*mask)) {
	+ for (y = 0; y < 8; y++) {
	+ if ((p[x] & (0x80 >> y)) == 0)
	+ break;
	+ }
	+ }
	+ return (x * 8 + y);
	+}
	+
	int
	in_control(struct socket so, u_long cmd, void data, struct ifnet *ifp,
	struct thread *td)
	diff --git a/sys/netinet/in_var.h b/sys/netinet/in_var.h
	--- a/sys/netinet/in_var.h
	+++ b/sys/netinet/in_var.h
	@@ -459,6 +459,7 @@
	int in_leavegroup(struct in_multi , /const/ struct in_mfilter );
	int in_leavegroup_locked(struct in_multi *,
	/const/ struct in_mfilter *);
	+int in_mask2len(struct in_addr *);
	int in_control(struct socket , u_long, void , struct ifnet *,
	struct thread *);
	int in_control_ioctl(u_long, void , struct ifnet ,