Commit 5636376c authored Jul 06, 2019 by Josua Mayer Committed by Marcel Holtmann Jul 06, 2019

Bluetooth: 6lowpan: check neighbour table for SLAAC

Like any IPv6 capable device, 6LNs can have multiple addresses assigned
using SLAAC and made known through neighbour advertisements.
After checking the destination address against all peers link-local
addresses, consult the neighbour cache for additional known addresses.

RFC7668 defines the scope of Neighbor Advertisements in Section 3.2.3:
1. "A Bluetooth LE 6LN MUST NOT register its link-local address"
2. "A Bluetooth LE 6LN MUST register its non-link-local addresses with
the 6LBR by sending Neighbor Solicitation (NS) messages ..."

Due to these constranits both the link-local addresses tracked in the
list of 6lowpan peers, and the neighbour cache have to be used when
identifying the 6lowpan peer for a destination address.

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>

parent b188b032

net/bluetooth/6lowpan.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -164,6 +164,7 @@ static inline struct lowpan_peer peer_lookup_dst(struct lowpan_btle_dev dev,
		int count = atomic_read(&dev->peer_count);
		const struct in6_addr *nexthop;
		struct lowpan_peer *peer;
		struct neighbour *neigh;

		BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);

		@@ -215,6 +216,20 @@ static inline struct lowpan_peer peer_lookup_dst(struct lowpan_btle_dev dev,
		}
		}

		/* use the neighbour cache for matching addresses assigned by SLAAC
		*/
		neigh = __ipv6_neigh_lookup(dev->netdev, nexthop);
		if (neigh) {
		list_for_each_entry_rcu(peer, &dev->peers, list) {
		if (!memcmp(neigh->ha, peer->lladdr, ETH_ALEN)) {
		neigh_release(neigh);
		rcu_read_unlock();
		return peer;
		}
		}
		neigh_release(neigh);
		}

		rcu_read_unlock();

		return NULL;