batman-adv: detect not yet announced clients
With the current TT mechanism a new client joining the network is not
immediately able to communicate with other hosts because its MAC address has not
been announced yet. This situation holds until the first OGM containing its
joining event will be spread over the mesh network.
This behaviour can be acceptable in networks where the originator interval is a
small value (e.g. 1sec) but if that value is set to an higher time (e.g. 5secs)
the client could suffer from several malfunctions like DHCP client timeouts,
etc.
This patch adds an early detection mechanism that makes nodes in the network
able to recognise "not yet announced clients" by means of the broadcast packets
they emitted on connection (e.g. ARP or DHCP request). The added client will
then be confirmed upon receiving the OGM claiming it or purged if such OGM
is not received within a fixed amount of time.
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 97c4978..2ed82ca 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -284,6 +284,7 @@
uint8_t addr[ETH_ALEN];
struct hlist_node hash_entry;
uint16_t flags;
+ unsigned long added_at;
atomic_t refcount;
struct rcu_head rcu;
};