In the output path, mask off M_BCAST|M_MCAST so as to prevent incorrect

addressing if a packet is later re-encapsulated and sent to a
non-broadcast, non-multicast destination after being received on the
ng_ksocket input hook.

PR:		106999
Submitted by:	Kevin Lahey
MFC after:	4 weeks

sys/netgraph/ng_ksocket.c

@@ -919,6 +919,9 @@ ng_ksocket_rcvdata(hook_p hook, item_p item)
 	    (stag->id == NG_NODE_ID(node) || stag->id == 0))
 		sa = &stag->sa;
 
+	/* Reset specific mbuf flags to prevent addressing problems. */
+	m->m_flags &= ~(M_BCAST|M_MCAST);
+
 	/* Send packet */
 	error = sosend(so, sa, 0, m, 0, 0, td);