Linux-Bluetooth Archive on lore.kernel.org
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* [RFC] bluetooth_6lowpan: search for destination address in all peers
@ 2019-01-10 16:47 Josua Mayer
  0 siblings, 0 replies; 1+ messages in thread
From: Josua Mayer @ 2019-01-10 16:47 UTC (permalink / raw)
  To: Bluez mailing list

From: Josua Mayer <josua.mayer97@gmail.com>

Handle overlooked case where the target address is assigned to a peer
and neither route nor gateway exist.

For one peer, no checks are performed to see if it is meant to receive
packets for a given address.

As soon as there is a second peer however, checks are performed
to deal with routes and gatways for handling complex setups with
multiple hops to a target address.
This logic assumed that no route and no gatway imply that the
destination address can not be reached, which is false in case of a
direct peer.
---
 net/bluetooth/6lowpan.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 828e87fe8027..f706b8a13fad 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -187,10 +187,16 @@ static inline struct lowpan_peer
*peer_lookup_dst(struct lowpan_btle_dev *dev,
 	}

 	if (!rt) {
-		nexthop = &lowpan_cb(skb)->gw;
-
-		if (ipv6_addr_any(nexthop))
-			return NULL;
+		if (ipv6_addr_any(&lowpan_cb(skb)->gw)) {
+			/* There is neither route nor gateway,
+			 * probably the destination is a direct peer.
+			 */
+			nexthop = daddr;
+		} else {
+			/* There is a known gateway
+			 */
+			nexthop = &lowpan_cb(skb)->gw;
+		}
 	} else {
 		nexthop = rt6_nexthop(rt, daddr);

-- 
2.20.1


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2019-01-10 16:47 [RFC] bluetooth_6lowpan: search for destination address in all peers Josua Mayer

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