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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/Documentation/networking/batman-adv.txt
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
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+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/
+# iface_status mesh_iface
+
+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.
+
+To activate a given interface simply write "bat0" into its
+"mesh_iface" file inside the batman_adv subfolder:
+
+# echo bat0 > /sys/class/net/eth0/batman_adv/mesh_iface
+
+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 write "none" into its
+"mesh_iface" file:
+
+# echo none > /sys/class/net/eth0/batman_adv/mesh_iface
+
+
+All mesh wide settings can be found in batman's own interface
+folder:
+
+# ls /sys/class/net/bat0/mesh/
+#aggregated_ogms distributed_arp_table gw_sel_class orig_interval
+#ap_isolation fragmentation hop_penalty routing_algo
+#bonding gw_bandwidth isolation_mark vlan0
+#bridge_loop_avoidance gw_mode log_level
+
+There is a special folder for debugging information:
+
+# ls /sys/kernel/debug/batman_adv/bat0/
+# bla_backbone_table log transtable_global
+# bla_claim_table originators transtable_local
+# gateways socket
+
+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: ifconfig bat0 192.168.0.1
+# NodeB: ifconfig bat0 192.168.0.2
+# 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.
+
+# ifconfig eth0 0.0.0.0
+
+
+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 messaged related to DAT, ARP snooping and parsing
+31 - 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 http://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>