Merge tag 'batadv-next-for-davem-20170802' of git://git.open-mesh.org/linux-merge

	- info on where to get ATM programs and support for Linux.

ax25.txt

	- info on using AX.25 and NET/ROM code for Linux

batman-adv.txt

	- B.A.T.M.A.N routing protocol on top of layer 2 Ethernet Frames.

baycom.txt

	- info on the driver for Baycom style amateur radio modems

bonding.txt

==========

batman-adv

==========

Batman advanced is a new approach to wireless networking which does no longer

operate on the IP basis. Unlike the batman daemon, which exchanges information

using UDP packets and sets routing tables, batman-advanced operates on ISO/OSI

Layer 2 only and uses and routes (or better: bridges) Ethernet Frames. It

emulates a virtual network switch of all nodes participating. Therefore all

nodes appear to be link local, thus all higher operating protocols won't be

affected by any changes within the network. You can run almost any protocol

above batman advanced, prominent examples are: IPv4, IPv6, DHCP, IPX.

Batman advanced was implemented as a Linux kernel driver to reduce the overhead

to a minimum. It does not depend on any (other) network driver, and can be used

on wifi as well as ethernet lan, vpn, etc ... (anything with ethernet-style

layer 2).

Configuration

=============

Load the batman-adv module into your kernel::

  $ insmod batman-adv.ko

The module is now waiting for activation. You must add some interfaces on which

batman can operate. After loading the module batman advanced will scan your

systems interfaces to search for compatible interfaces. Once found, it will

create subfolders in the ``/sys`` directories of each supported interface,

e.g.::

  $ ls /sys/class/net/eth0/batman_adv/

  elp_interval iface_status mesh_iface throughput_override

If an interface does not have the ``batman_adv`` subfolder, it probably is not

supported. Not supported interfaces are: loopback, non-ethernet and batman's

own interfaces.

Note: After the module was loaded it will continuously watch for new

interfaces to verify the compatibility. There is no need to reload the module

if you plug your USB wifi adapter into your machine after batman advanced was

initially loaded.

The batman-adv soft-interface can be created using the iproute2 tool ``ip``::

  $ ip link add name bat0 type batadv

To activate a given interface simply attach it to the ``bat0`` interface::

  $ ip link set dev eth0 master bat0

Repeat this step for all interfaces you wish to add. Now batman starts

using/broadcasting on this/these interface(s).

By reading the "iface_status" file you can check its status::

  $ cat /sys/class/net/eth0/batman_adv/iface_status

  active

To deactivate an interface you have to detach it from the "bat0" interface::

  $ ip link set dev eth0 nomaster

All mesh wide settings can be found in batman's own interface folder::

  $ ls /sys/class/net/bat0/mesh/

  aggregated_ogms       fragmentation isolation_mark routing_algo

  ap_isolation          gw_bandwidth  log_level      vlan0

  bonding               gw_mode       multicast_mode

  bridge_loop_avoidance gw_sel_class  network_coding

  distributed_arp_table hop_penalty   orig_interval

There is a special folder for debugging information::

  $ ls /sys/kernel/debug/batman_adv/bat0/

  bla_backbone_table log         neighbors         transtable_local

  bla_claim_table    mcast_flags originators

  dat_cache          nc          socket

  gateways           nc_nodes    transtable_global

Some of the files contain all sort of status information regarding the mesh

network. For example, you can view the table of originators (mesh

participants) with::

  $ cat /sys/kernel/debug/batman_adv/bat0/originators

Other files allow to change batman's behaviour to better fit your requirements.

For instance, you can check the current originator interval (value in

milliseconds which determines how often batman sends its broadcast packets)::

  $ cat /sys/class/net/bat0/mesh/orig_interval

  1000

and also change its value::

  $ echo 3000 > /sys/class/net/bat0/mesh/orig_interval

In very mobile scenarios, you might want to adjust the originator interval to a

lower value. This will make the mesh more responsive to topology changes, but

will also increase the overhead.

Usage

=====

To make use of your newly created mesh, batman advanced provides a new

interface "bat0" which you should use from this point on. All interfaces added

to batman advanced are not relevant any longer because batman handles them for

you. Basically, one "hands over" the data by using the batman interface and

batman will make sure it reaches its destination.

The "bat0" interface can be used like any other regular interface. It needs an

IP address which can be either statically configured or dynamically (by using

DHCP or similar services)::

  NodeA: ip link set up dev bat0

  NodeA: ip addr add 192.168.0.1/24 dev bat0

  NodeB: ip link set up dev bat0

  NodeB: ip addr add 192.168.0.2/24 dev bat0

  NodeB: ping 192.168.0.1

Note: In order to avoid problems remove all IP addresses previously assigned to

interfaces now used by batman advanced, e.g.::

  $ ip addr flush dev eth0

Logging/Debugging

=================

All error messages, warnings and information messages are sent to the kernel

log. Depending on your operating system distribution this can be read in one of

a number of ways. Try using the commands: ``dmesg``, ``logread``, or looking in

the files ``/var/log/kern.log`` or ``/var/log/syslog``. All batman-adv messages

are prefixed with "batman-adv:" So to see just these messages try::

  $ dmesg | grep batman-adv

When investigating problems with your mesh network, it is sometimes necessary to

see more detail debug messages. This must be enabled when compiling the

batman-adv module. When building batman-adv as part of kernel, use "make

menuconfig" and enable the option ``B.A.T.M.A.N. debugging``

(``CONFIG_BATMAN_ADV_DEBUG=y``).

Those additional debug messages can be accessed using a special file in

debugfs::

  $ cat /sys/kernel/debug/batman_adv/bat0/log

The additional debug output is by default disabled. It can be enabled during

run time. Following log_levels are defined:

.. flat-table::

   * - 0

     - All debug output disabled

   * - 1

     - Enable messages related to routing / flooding / broadcasting

   * - 2

     - Enable messages related to route added / changed / deleted

   * - 4

     - Enable messages related to translation table operations

   * - 8

     - Enable messages related to bridge loop avoidance

   * - 16

     - Enable messages related to DAT, ARP snooping and parsing

   * - 32

     - Enable messages related to network coding

   * - 64

     - Enable messages related to multicast

   * - 128

     - Enable messages related to throughput meter

   * - 255

     - Enable all messages

The debug output can be changed at runtime using the file

``/sys/class/net/bat0/mesh/log_level``. e.g.::

  $ echo 6 > /sys/class/net/bat0/mesh/log_level

will enable debug messages for when routes change.

Counters for different types of packets entering and leaving the batman-adv

module are available through ethtool::

  $ ethtool --statistics bat0

batctl

======

As batman advanced operates on layer 2, all hosts participating in the virtual

switch are completely transparent for all protocols above layer 2. Therefore

the common diagnosis tools do not work as expected. To overcome these problems,

batctl was created. At the moment the batctl contains ping, traceroute, tcpdump

and interfaces to the kernel module settings.

For more information, please see the manpage (``man batctl``).

batctl is available on https://www.open-mesh.org/

Contact

=======

Please send us comments, experiences, questions, anything :)

IRC:

  #batman on irc.freenode.org

Mailing-list:

  b.a.t.m.a.n@open-mesh.org (optional subscription at

  https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n)

You can also contact the Authors:

* Marek Lindner <mareklindner@neomailbox.ch>

* Simon Wunderlich <sw@simonwunderlich.de>

BATMAN-ADV

----------

Batman  advanced  is  a new approach to wireless networking which

does no longer operate on the IP basis. Unlike the batman daemon,

which  exchanges  information  using UDP packets and sets routing

tables, batman-advanced operates on ISO/OSI Layer 2 only and uses

and  routes  (or  better: bridges) Ethernet Frames. It emulates a

virtual network switch of all nodes participating.  Therefore all

nodes  appear  to be link local, thus all higher operating proto-

cols won't be affected by any changes within the network. You can

run almost any protocol above batman advanced, prominent examples

are: IPv4, IPv6, DHCP, IPX.

Batman advanced was implemented as a Linux kernel driver  to  re-

duce the overhead to a minimum. It does not depend on any (other)

network driver, and can be used on wifi as well as ethernet  lan,

vpn,  etc ... (anything with ethernet-style layer 2).

CONFIGURATION

-------------

Load the batman-adv module into your kernel:

# insmod batman-adv.ko

The  module  is now waiting for activation. You must add some in-

terfaces on which batman can operate. After  loading  the  module

batman  advanced  will scan your systems interfaces to search for

compatible interfaces. Once found, it will create  subfolders  in

the /sys directories of each supported interface, e.g.

# ls /sys/class/net/eth0/batman_adv/

# elp_interval  iface_status  mesh_iface  throughput_override

If an interface does not have the "batman_adv" subfolder it prob-

ably is not supported. Not supported  interfaces  are:  loopback,

non-ethernet and batman's own interfaces.

Note:  After the module was loaded it will continuously watch for

new interfaces to verify the compatibility. There is no  need  to

reload the module if you plug your USB wifi adapter into your ma-

chine after batman advanced was initially loaded.

The batman-adv soft-interface can be created using  the  iproute2

tool "ip"

# ip link add name bat0 type batadv

To  activate a  given  interface  simply  attach it to the "bat0"

interface

# ip link set dev eth0 master bat0

Repeat  this step for all interfaces you wish to add.  Now batman

starts using/broadcasting on this/these interface(s).

By reading the "iface_status" file you can check its status:

# cat /sys/class/net/eth0/batman_adv/iface_status

# active

To  deactivate  an  interface  you  have   to  detach it from the

"bat0" interface:

# ip link set dev eth0 nomaster

All  mesh  wide  settings  can be found in batman's own interface

folder:

# ls /sys/class/net/bat0/mesh/

# aggregated_ogms        fragmentation  isolation_mark  routing_algo

# ap_isolation           gw_bandwidth   log_level       vlan0

# bonding                gw_mode        multicast_mode

# bridge_loop_avoidance  gw_sel_class   network_coding

# distributed_arp_table  hop_penalty    orig_interval

There is a special folder for debugging information:

# ls /sys/kernel/debug/batman_adv/bat0/

# bla_backbone_table  log          neighbors          transtable_local

# bla_claim_table     mcast_flags  originators

# dat_cache           nc           socket

# gateways            nc_nodes     transtable_global

Some of the files contain all sort of status information  regard-

ing  the  mesh  network.  For  example, you can view the table of

originators (mesh participants) with:

# cat /sys/kernel/debug/batman_adv/bat0/originators

Other files allow to change batman's behaviour to better fit your

requirements.  For instance, you can check the current originator

interval (value in milliseconds which determines how often batman

sends its broadcast packets):

# cat /sys/class/net/bat0/mesh/orig_interval

# 1000

and also change its value:

# echo 3000 > /sys/class/net/bat0/mesh/orig_interval

In very mobile scenarios, you might want to adjust the originator

interval to a lower value. This will make the mesh  more  respon-

sive to topology changes, but will also increase the overhead.

USAGE

-----

To  make use of your newly created mesh, batman advanced provides

a new interface "bat0" which you should use from this  point  on.

All  interfaces  added  to  batman  advanced are not relevant any

longer because batman handles them for you. Basically, one "hands

over" the data by using the batman interface and batman will make

sure it reaches its destination.

The "bat0" interface can be used like any  other  regular  inter-

face.  It needs an IP address which can be either statically con-

figured or dynamically (by using DHCP or similar services):

# NodeA: ip link set up dev bat0

# NodeA: ip addr add 192.168.0.1/24 dev bat0

# NodeB: ip link set up dev bat0

# NodeB: ip addr add 192.168.0.2/24 dev bat0

# NodeB: ping 192.168.0.1

Note:  In  order to avoid problems remove all IP addresses previ-

ously assigned to interfaces now used by batman advanced, e.g.

# ip addr flush dev eth0

LOGGING/DEBUGGING

-----------------

All error messages, warnings and information messages are sent to

the kernel log. Depending on your operating  system  distribution

this  can  be read in one of a number of ways. Try using the com-

mands: dmesg, logread, or looking in the files  /var/log/kern.log

or  /var/log/syslog.  All  batman-adv  messages are prefixed with

"batman-adv:" So to see just these messages try

# dmesg | grep batman-adv

When investigating problems with your mesh network  it  is  some-

times  necessary  to see more detail debug messages. This must be

enabled when compiling the batman-adv module. When building  bat-

man-adv  as  part of kernel, use "make menuconfig" and enable the

option "B.A.T.M.A.N. debugging".

Those additional  debug messages can be accessed  using a special

file in debugfs

# cat /sys/kernel/debug/batman_adv/bat0/log

The additional debug output is by default disabled. It can be en-

abled  during run time. Following log_levels are defined:

  0 - All  debug  output  disabled

  1 - Enable messages related to routing / flooding / broadcasting

  2 - Enable messages related to route added / changed / deleted

  4 - Enable messages related to translation table operations

  8 - Enable messages related to bridge loop avoidance

 16 - Enable messages related to DAT, ARP snooping and parsing

 32 - Enable messages related to network coding

 64 - Enable messages related to multicast

128 - Enable messages related to throughput meter

255 - Enable all messages

The debug output can be changed at runtime  using  the  file

/sys/class/net/bat0/mesh/log_level. e.g.

# echo 6 > /sys/class/net/bat0/mesh/log_level

will enable debug messages for when routes change.

Counters for different types of packets entering and leaving the

batman-adv module are available through ethtool:

# ethtool --statistics bat0

BATCTL

------

As batman advanced operates on layer 2 all hosts participating in

the  virtual switch are completely transparent for all  protocols

above layer 2. Therefore the common diagnosis tools do  not  work

as  expected.  To  overcome these problems batctl was created. At

the  moment the  batctl contains ping,  traceroute,  tcpdump  and

interfaces to the kernel module settings.

For more information, please see the manpage (man batctl).

batctl is available on https://www.open-mesh.org/

CONTACT

-------

Please send us comments, experiences, questions, anything :)

IRC:            #batman   on   irc.freenode.org

Mailing-list:   b.a.t.m.a.n@open-mesh.org (optional  subscription

          at https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n)

You can also contact the Authors:

Marek  Lindner  <mareklindner@neomailbox.ch>

Simon  Wunderlich  <sw@simonwunderlich.de>

.. toctree::

   :maxdepth: 2

   batman-adv

   kapi

   z8530book

S:	Maintained

F:	Documentation/ABI/testing/sysfs-class-net-batman-adv

F:	Documentation/ABI/testing/sysfs-class-net-mesh

F:	Documentation/networking/batman-adv.txt

F:	Documentation/networking/batman-adv.rst

F:	include/uapi/linux/batman_adv.h

F:	net/batman-adv/