6lowpan: ndisc: set invalid unicast short addr to unspec

When receiving neighbour information with short address option field we should check the complete range of invalid short addresses and set it to one invalid address setting which is the unspecified address. This address is also used when by creating at first a new neighbour entry to indicate no short address is set. Signed-off-by: Alexander Aring <[email protected]> Signed-off-by: Marcel Holtmann <[email protected]>
ambv · Jul 8, 2016 · 9e262f5 · 9e262f5
1 parent aaa7088
commit 9e262f5
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/net/6lowpan/ndisc.c b/net/6lowpan/ndisc.c
@@ -97,10 +97,13 @@ static void lowpan_ndisc_802154_update(struct neighbour *n, u32 flags,
 	}
 
 	write_lock_bh(&n->lock);
-	if (lladdr_short)
+	if (lladdr_short) {
 		ieee802154_be16_to_le16(&neigh->short_addr, lladdr_short);
-	else
+		if (!lowpan_802154_is_valid_src_short_addr(neigh->short_addr))
+			neigh->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC);
+	} else {
 		neigh->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC);
+	}
 	write_unlock_bh(&n->lock);
 }