From: Josua Mayer josua.mayer@jm0.eu
[ Upstream commit b188b03270b7f8568fc714101ce82fbf5e811c5a ]
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 gateways for handling complex setups with multiple hops to a target address. This logic assumed that no route and no gateway imply that the destination address can not be reached, which is false in case of a direct peer.
Acked-by: Jukka Rissanen jukka.rissanen@linux.intel.com Tested-by: Michael Scott mike@foundries.io Signed-off-by: Josua Mayer josua.mayer@jm0.eu Signed-off-by: Marcel Holtmann marcel@holtmann.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 795ddd8b2f77..4cd6b8d811ff 100644 --- a/net/bluetooth/6lowpan.c +++ b/net/bluetooth/6lowpan.c @@ -184,10 +184,16 @@ static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_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);