1 files changed, 168 insertions, 0 deletions
diff --git a/Documentation/networking/batman-adv.rst b/Documentation/networking/batman-adv.rst
new file mode 100644
index 000000000..74821d29a
--- /dev/null
+++ b/Documentation/networking/batman-adv.rst
@@ -0,0 +1,168 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==========
+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-adv can operate. 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-adv starts
+using/broadcasting on this/these interface(s).
+
+To deactivate an interface you have to detach it from the "bat0" interface::
+
+  $ ip link set dev eth0 nomaster
+
+The same can also be done using the batctl interface subcommand::
+
+  batctl -m bat0 interface create
+  batctl -m bat0 interface add -M eth0
+
+To detach eth0 and destroy bat0::
+
+  batctl -m bat0 interface del -M eth0
+  batctl -m bat0 interface destroy
+
+There are additional settings for each batadv mesh interface, vlan and hardif
+which can be modified using batctl. Detailed information about this can be found
+in its manual.
+
+For instance, you can check the current originator interval (value
+in milliseconds which determines how often batman-adv sends its broadcast
+packets)::
+
+  $ batctl -M bat0 orig_interval
+  1000
+
+and also change its value::
+
+  $ batctl -M bat0 orig_interval 3000
+
+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.
+
+Information about the current state can be accessed via the batadv generic
+netlink family. batctl provides a human readable version via its debug tables
+subcommands.
+
+
+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 detailed debug messages. This must be enabled when compiling the
+batman-adv module. When building batman-adv as part of the 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 the perf infrastructure::
+
+  $ trace-cmd stream -e batadv:batadv_dbg
+
+The additional debug output is by default disabled. It can be enabled during
+run time::
+
+  $ batctl -m bat0 loglevel routes tt
+
+will enable debug messages for when routes and translation table entries 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/mailman3/postorius/lists/b.a.t.m.a.n.lists.open-mesh.org/)
+
+You can also contact the Authors:
+
+* Marek Lindner <mareklindner@neomailbox.ch>
+* Simon Wunderlich <sw@simonwunderlich.de>