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  1. 12 10月, 2013 2 次提交
  3. 10 10月, 2013 2 次提交
  5. 29 5月, 2013 1 次提交
  7. 19 1月, 2013 1 次提交
  9. 15 11月, 2012 1 次提交
    • A
      batman-adv: substitute tt_poss_change with a per-tt_entry flag · 7c1fd91d
      由 Antonio Quartulli 提交于 
      tt_poss_change is a node-wide flag which tells whether the node is in a roaming
state (a client recently moved to/away from it) in order to let it apply special
re-routing rules. However this flag does not give a clear idea of the current
state because it is not possible to understand *which client* is actually
involved in the roaming. For this reason a better approach has been chosen:
instead of using a node-wide variable, the roaming state is now given by a
per-tt_entry ROAM flag which, in case of packet coming through the node, tells
the node whether the real destination is in roaming state or not.

With this flag change, batadv_check_unicast_ttvn() has also been rearranged in
order to better fit the new re-routing logic and to be much more readable.
Signed-off-by: NAntonio Quartulli <ordex@autistici.org>
      7c1fd91d
  11. 29 10月, 2012 1 次提交
    • A
      batman-adv: pass the WIFI flag from the local to global entry · 7f91d06c
      由 Antonio Quartulli 提交于 
      in case of client roaming a new global entry is added while a corresponding
local one is still present. In this case the node can safely pass the WIFI flag
from the local to the global entry.

This change is required to let the AP-isolation correctly working in case of
roaming: if a generic WIFI client C roams from node A to B, A adds a global
entry for C without adding any WIFI flag. The latter will be set only later,
once A has received C's advertisement from B. In this time period the
AP-Isolation (if enabled) would not correctly work since C is not marked as
WIFI, so allowing it to communicate with other WIFI clients.
Signed-off-by: NAntonio Quartulli <ordex@autistici.org>
      7f91d06c
  13. 23 8月, 2012 1 次提交
    • A
      batman-adv: detect not yet announced clients · 30cfd02b
      由 Antonio Quartulli 提交于 
      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: NAntonio Quartulli <ordex@autistici.org>
      30cfd02b
  15. 02 7月, 2012 2 次提交
  17. 28 6月, 2012 1 次提交
  19. 21 6月, 2012 2 次提交
  21. 19 6月, 2012 1 次提交
  23. 14 5月, 2012 1 次提交
    • A
      batman-adv: improve unicast packet (re)routing · 3275e7cc
      由 Antonio Quartulli 提交于 
      In case of a client X roaming from a generic node A to another node B, it is
possible that a third node C gets A's OGM but not B's. At this point in time, if
C wants to send data to X it will send a unicast packet destined to A. The
packet header will contain A's last ttvn (C got A's OGM and so it knows it).

The packet will travel towards A without being intercepted because the ttvn
contained in its header is the newest for A.

Once A will receive the packet, A's state will not report to be in a "roaming
phase" (because, after a roaming, once A sends out its OGM, all the changes are
committed and the node is considered not to be in the roaming state anymore)
and it will match the ttvn carried by the packet. Therefore there is no reason
for A to try to alter the packet's route, thus dropping the packet because the
destination client is not there anymore.

However, C is well aware that it's routing information towards the client X is
outdated as it received an OGM from A saying that the client roamed away.
Thanks to this detail, this patch introduces a small change in behaviour: as
long as C is in the state of not knowing the new location of client X it will
forward the traffic to its last known location using ttvn-1 of the destination.
By using an older ttvn node A will be forced to re-route the packet.
Intermediate nodes are also allowed to update the packet's destination as long
as they have the information about the client's new location.
Signed-off-by: NAntonio Quartulli <ordex@autistici.org>
      3275e7cc
  25. 11 5月, 2012 1 次提交
  27. 11 4月, 2012 1 次提交
  29. 17 2月, 2012 1 次提交
  31. 22 8月, 2011 5 次提交
  33. 08 7月, 2011 1 次提交
  35. 05 7月, 2011 1 次提交
    • A
      batman-adv: unify flags for tt_change/tt_local_entry/tt_global_entry · 5fbc1598
      由 Antonio Quartulli 提交于 
      The tt_local_entry structure now has a 'flags' field. This helps to
unify the flags format to all the client related structures (tt_global_entry
and tt_change). The 'never_purge' field is now encoded in the 'flags' one.
To optimise the usage of this field, its length has been increased to 16bit
in order to use the eight leading bits (from 0 to 7) to store flags that
have to be sent on the wire, while the eight ending ones are used for local
computation only.

Moreover 'enum tt_change_flags' is now called 'enum tt_client_flags' and the
defined values apply to the tt_local_entry, tt_global_entry and the tt_change
'flags' field.
Signed-off-by: NAntonio Quartulli <ordex@autistici.org>
Signed-off-by: NMarek Lindner <lindner_marek@yahoo.de>
      5fbc1598
  37. 20 6月, 2011 2 次提交
    • A
      batman-adv: improved roaming mechanism · cc47f66e
      由 Antonio Quartulli 提交于 
      With the current client announcement implementation, in case of roaming,
an update is triggered on the new AP serving the client. At that point
the new information is spread around by means of the OGM broadcasting
mechanism. Until this operations is not executed, no node is able to
correctly route traffic towards the client. This obviously causes packet
drops and introduces a delay in the time needed by the client to recover
its connections.

A new packet type called ROAMING_ADVERTISEMENT is added to account this
issue.

This message is sent in case of roaming from the new AP serving the
client to the old one and will contain the client MAC address. In this
way an out-of-OGM update is immediately committed, so that the old node
can update its global translation table. Traffic reaching this node will
then be redirected to the correct destination utilising the fresher
information. Thus reducing the packet drops and the connection recovery
delay.
Signed-off-by: NAntonio Quartulli <ordex@autistici.org>
Signed-off-by: NSven Eckelmann <sven@narfation.org>
      cc47f66e
    • A
      batman-adv: improved client announcement mechanism · a73105b8
      由 Antonio Quartulli 提交于 
      The client announcement mechanism informs every mesh node in the network
of any connected non-mesh client, in order to find the path towards that
client from any given point in the mesh.

The old implementation was based on the simple idea of appending a data
buffer to each OGM containing all the client MAC addresses the node is
serving. All other nodes can populate their global translation tables
(table which links client MAC addresses to node addresses) using this
MAC address buffer and linking it to the node's address contained in the
OGM. A node that wants to contact a client has to lookup the node the
client is connected to and its address in the global translation table.

It is easy to understand that this implementation suffers from several
issues:
 - big overhead (each and every OGM contains the entire list of
   connected clients)
 - high latencies for client route updates due to long OGM trip time and
   OGM losses

The new implementation addresses these issues by appending client
changes (new client joined or a client left) to the OGM instead of
filling it with all the client addresses each time. In this way nodes
can modify their global tables by means of "updates", thus reducing the
overhead within the OGMs.

To keep the entire network in sync each node maintains a translation
table version number (ttvn) and a translation table checksum. These
values are spread with the OGM to allow all the network participants to
determine whether or not they need to update their translation table
information.

When a translation table lookup is performed in order to send a packet
to a client attached to another node, the destination's ttvn is added to
the payload packet. Forwarding nodes can compare the packet's ttvn with
their destination's ttvn (this node could have a fresher information
than the source) and re-route the packet if necessary. This greatly
reduces the packet loss of clients roaming from one AP to the next.
Signed-off-by: NAntonio Quartulli <ordex@autistici.org>
Signed-off-by: NMarek Lindner <lindner_marek@yahoo.de>
Signed-off-by: NSven Eckelmann <sven@narfation.org>
      a73105b8
  39. 30 5月, 2011 1 次提交
  41. 08 5月, 2011 1 次提交
  43. 12 2月, 2011 1 次提交
  45. 31 1月, 2011 1 次提交
  47. 17 12月, 2010 1 次提交
  49. 05 9月, 2010 2 次提交
  51. 09 7月, 2010 1 次提交
  53. 23 6月, 2010 2 次提交
  55. 12 5月, 2010 2 次提交