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Bluetooth: 6lowpan: check neighbour table for SLAAC

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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>
This commit is contained in:
Josua Mayer 2019-07-06 17:54:47 +02:00 committed by Marcel Holtmann
parent b188b03270
commit 5636376c26
1 changed files with 15 additions and 0 deletions
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15
net/bluetooth/6lowpan.c
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@ -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;