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Current status of project open80211s . Date: 2008-11-10. Authors:. Name Affiliations Address Phone email Javier Cardona cozybit Inc. 165 Jessie St. +1 415 974 6770 javier@cozybit.com Anna Neal San Francisco anna@cozybit.com CA 94105. Outline.

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current status of project open80211s
Javier CardonaCurrent status of project open80211s

Date: 2008-11-10

Authors:

Name Affiliations Address Phone email

Javier Cardona cozybit Inc. 165 Jessie St. +1 415 974 6770 javier@cozybit.com

Anna Neal San Francisco anna@cozybit.com

CA 94105

outline
Javier CardonaOutline

Review of Project Goals

Original Project Scope

Implemented Features

Implementation Details

Configuration

Testing

Current status

To Do

Q&A

review of goals
Javier CardonaReview of Goals

1. To facilitate the adoption of the upcoming standard of 802.11s by providing its first open implementation.

2. To replace the numerous existing, non-interoperable, incomplete mesh implementations with one based on the standard.

3. To raise visibility of 802.11s technology and to promote a community of active developers interested in 802.11s.

original scope of project
Javier CardonaOriginal Scope of Project

Software

  • open80211s will run on Linux.
  • based on the generic 802.11 networking stack (mac80211)‏
  • aim to merge upstream (Linus tree)‏

Hardware

  • “softmac” wireless network cards.
  • Open Linux driver available, no binary modules.
implemented features
Javier CardonaImplemented Features

SECTION

7

11B.1

11B.3

11B.61

11B.9

11B.8

11B.12

FEATURE

Frame Format

Mesh Discovery

Peer Link Management

Mesh Path Selection

HWMP

Airtime Link Metric Calculations

Mesh Beaconing

implementation details

+------------------------------------------------------+

| IP |

+------------------------------------------------------+

| 802.1 bridging |

+-------------------------------------******************

| AP | STA * Mesh *

+-------------------------------------*----------------*

| mac80211 * o11s *

+-------------------------------------******************

| wireless device driver |

+------------------------------------------------------+

Implementation Details

Javier Cardona

implementation details7
Javier CardonaImplementation Details

mac80211

  • o11s functionality integrated into the 802.11 subsystem used for SoftMAC Linux wireless drivers.
  • Additions to the stack include:
    • A new mesh interface type.
    • Management frame handling.
    • HWMP
    • Peer Link Management.
    • Mesh frame format.
implementation details8
Implementation Details

nl80211

  • o11s integrated into the new netlink based configuration interface.
  • nl80211 is used by iw to interface to the mesh.
  • Additions to iw include:
  • Adding the mesh interface
  • Forcing custom peer links
  • Printing mesh paths and peer links.
  • Setting up custom mesh paths.
  • Blacklisting.

Javier Cardona

configuration
Configuration

# iw phy phy0 interface add mesh0 type mp mesh_id mymesh

# iw dev mesh0 station dump

00:11:a3:03:fe:32 msh0 576 11409 160 27160 9158 ESTAB

00:c0:49:fc:db:ca msh0 60 45435 20024 4162 2895 ESTAB

00:11:a3:03:ed:3a msh0 536 11409 160 27160 9158 ESTAB

00:c0:49:f0:d0:73 msh0 601 35438 30024 4462 1195 OPN_SNT

Javier Cardona

configuration10
Configuration

# iw dev mesh0 path dump

00:c0:49:fc:db:ca 00:c0:49:fc:db:ca msh0

362 152 0 2568 100 0 0x15

00:11:a3:03:fe:32 00:11:a3:03:fe:32 msh0

0 8193 0 2568 0 0 0x11

Javier Cardona

configuration11
Configuration

# cd debugfs && grep . mesh_config

auto_open_plinks:1

dot11MeshConfirmTimeout:100

dot11MeshHoldingTimeout:100

dot11MeshHWMPactivePathTimeout:5000

dot11MeshHWMPmaxPREQretries:4

dot11MeshHWMPnetDiameterTraversalTime:50

dot11MeshHWMPpreqMinInterval:10

dot11MeshMaxPeerLinks:32

dot11MeshMaxRetries:3

dot11MeshRetryTimeout:100

dot11MeshTTL:5

Javier Cardona

testing
Javier CardonaTesting

Developer Testbed

  • 12 small form factor cluster with multiple o11s wireless cards.
  • Automated test suite for all the implemented features.
performance
Javier CardonaPerformance

Setup

Discovery time vs. Number of Hops

  • manually configure filter settings to enforce multi-hop topologies.
  • measure the discovery duration from the time a path setup is requested until the time that the path is actually established

Throughput vs. Number of Hops

  • default 802.11 parameters are used for measurements.
  • each experiment is run six times for 10 sec per measurement.
  • uncontrolled wireless environment.
performance14
Javier CardonaPerformance

Discovery time vs. Number of Hops

  • routes are resolved in linear time.
  • the variance increases with the length of the path.
performance15
Javier CardonaPerformance

Throughput vs. Number of Hops

  • sub-optimal paths forced by blacklisting peers.
current status
Javier CardonaCurrent Status
  • Kernel mainline integration achieved
  • Drivers with mesh capabilities keeps increasing (currently 5 supported device drivers)‏
  • On stand-by, but actively receiving contributions from the community:
    • mac80211_hwsim
    • 2 drivers
    • Support for proxied entities (6-address frame format)
to do
Javier CardonaTo Do
  • Sections pending implementation:

Security 8, 11B.5

Congestion control 11A.11

HT support

Power-Aware Metrics

  • Implement draft-2.02 changes.
  • Large scale testing ( >100 nodes)‏
slide19
Javier Cardona
  • Thank you!