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Index: sys/net/route/nhop_ctl.c
===================================================================
--- sys/net/route/nhop_ctl.c
+++ sys/net/route/nhop_ctl.c
@@ -381,7 +381,11 @@
/* Update MTU if set in the request*/
set_nhop_mtu_from_info(nh, info);
- /* XXX: allow only one of BLACKHOLE,REJECT,GATEWAY */
+ /* allow only one of BLACKHOLE,REJECT,GATEWAY */
+ if (((nh->nh_priv->rt_flags & RTF_BLACKHOLE) != 0) +
+ ((nh->nh_priv->rt_flags & RTF_REJECT) != 0) +
+ ((nh->nh_priv->rt_flags & RTF_GATEWAY) != 0) > 1)
+ return (EINVAL);
/* Allow some flags (FLAG1,STATIC,BLACKHOLE,REJECT) to be toggled on change. */
nh->nh_priv->rt_flags &= ~RTF_FMASK;

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