November 2009 - commits - lists.open-mesh.org

by postmaster＠open-mesh.net

Author: simon Date: 2009-11-07 10:59:00 +0000 (Sat, 07 Nov 2009) New Revision: 1462 Modified: trunk/batman-adv-kernelland/Makefile trunk/batman-adv-kernelland/Makefile.kbuild trunk/batman-adv-kernelland/README trunk/batman-adv-kernelland/aggregation.c trunk/batman-adv-kernelland/aggregation.h trunk/batman-adv-kernelland/bitarray.c trunk/batman-adv-kernelland/bitarray.h trunk/batman-adv-kernelland/compat.h trunk/batman-adv-kernelland/device.c trunk/batman-adv-kernelland/device.h trunk/batman-adv-kernelland/hard-interface.c trunk/batman-adv-kernelland/hard-interface.h trunk/batman-adv-kernelland/hash.c trunk/batman-adv-kernelland/hash.h trunk/batman-adv-kernelland/log.c trunk/batman-adv-kernelland/log.h trunk/batman-adv-kernelland/main.c trunk/batman-adv-kernelland/main.h trunk/batman-adv-kernelland/packet.h trunk/batman-adv-kernelland/proc.c trunk/batman-adv-kernelland/proc.h trunk/batman-adv-kernelland/ring_buffer.c trunk/batman-adv-kernelland/ring_buffer.h trunk/batman-adv-kernelland/routing.c trunk/batman-adv-kernelland/routing.h trunk/batman-adv-kernelland/send.c trunk/batman-adv-kernelland/send.h trunk/batman-adv-kernelland/soft-interface.c trunk/batman-adv-kernelland/soft-interface.h trunk/batman-adv-kernelland/translation-table.c trunk/batman-adv-kernelland/translation-table.h trunk/batman-adv-kernelland/types.h trunk/batman-adv-kernelland/vis.c trunk/batman-adv-kernelland/vis.h Log: update README and adjust year numbers in copyright notice Modified: trunk/batman-adv-kernelland/Makefile =================================================================== --- trunk/batman-adv-kernelland/Makefile 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/Makefile 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ # -# Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: +# Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: +# # Marek Lindner, Simon Wunderlich +# # This program is free software; you can redistribute it and/or # modify it under the terms of version 2 of the GNU General Public # License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/Makefile.kbuild =================================================================== --- trunk/batman-adv-kernelland/Makefile.kbuild 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/Makefile.kbuild 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ # -# Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: +# Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: +# # Marek Lindner, Simon Wunderlich +# # This program is free software; you can redistribute it and/or # modify it under the terms of version 2 of the GNU General Public # License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/README =================================================================== --- trunk/batman-adv-kernelland/README 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/README 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,11 +1,20 @@ -[state: 17-11-2008] +[state: 07-11-2009] BATMAN-ADV ---------- -The kernel implementation of batman-advanced. It does not depend on any network -driver, and can be used on wifi as well as ethernet, vpn, etc ... (anything -with ethernet-style layer 2). +Batman-advanced is a new approach to wireless networking which does no longer +operate on the IP basis. Unlike B.A.T.M.A.N, 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 B.A.T.M.A.N. Advanced, prominent examples are: IPv4, IPv6, DHCP, IPX. + +This is batman-advanced implemented as Linux kernel driver. It does not depend +on any network (other) driver, and can be used on wifi as well as ethernet, +vpn, etc ... (anything with ethernet-style layer 2). It compiles against and should work with Linux 2.6.20 - 2.6.31. Supporting older versions is not planned, but it's probably easy to backport it. If you work on a backport, feel free to contact us. :-) @@ -53,18 +62,54 @@ # echo "server" > /proc/net/batman-adv/vis +Each node is either configured as "server" or as "client" (default: +"client"). Clients send their topology data to the server next to them, +and server synchronize with other servers. If there is no server +configured (default) within the mesh, no topology information will be +transmitted. With these "synchronizing servers", there can be 1 or +more vis servers sharing the same (or at least very similar) data. + When configured as server, you can get a topology snapshot of your mesh: # cat /proc/net/batman-adv/vis -This output can be processed with graphviz-tools like dot. +This output format is a graphviz formatted text file which can be +processed with graphviz-tools like dot. The labels are similar/compatible to the ETX metric, 1.0 means perfect connection (100%), 2.0 means 50%, 3.0 means 33% and so on. +Alternatively, a JSON output format is available. The format can be set +using by writing either "dot_draw" or "json" into the vis_format file. +"dot_draw" is selected by default. + +echo "json" > /proc/net/batman-adv/vis_format + +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. Please make sure +that all nodes in your mesh use the same interval. The default value +is 1000 ms (1 second). + +# echo 1000 > /proc/net/batman-adv/orig_interval + To deactivate batman, do: # echo "" > /proc/net/batman-adv/interfaces +BATCTL +------ + +B.A.T.M.A.N. advanced operates on layer 2 and thus all hosts partici- +pating in the virtual switch are completely transparent for all proto- +cols 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.net/ + CONTACT ------- Modified: trunk/batman-adv-kernelland/aggregation.c =================================================================== --- trunk/batman-adv-kernelland/aggregation.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/aggregation.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/aggregation.h =================================================================== --- trunk/batman-adv-kernelland/aggregation.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/aggregation.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/bitarray.c =================================================================== --- trunk/batman-adv-kernelland/bitarray.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/bitarray.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2006-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2006-2009 B.A.T.M.A.N. contributors: + * * Simon Wunderlich, Marek Lindner + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/bitarray.h =================================================================== --- trunk/batman-adv-kernelland/bitarray.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/bitarray.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2006-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2006-2009 B.A.T.M.A.N. contributors: + * * Simon Wunderlich, Marek Lindner + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/compat.h =================================================================== --- trunk/batman-adv-kernelland/compat.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/compat.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/device.c =================================================================== --- trunk/batman-adv-kernelland/device.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/device.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/device.h =================================================================== --- trunk/batman-adv-kernelland/device.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/device.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/hard-interface.c =================================================================== --- trunk/batman-adv-kernelland/hard-interface.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/hard-interface.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/hard-interface.h =================================================================== --- trunk/batman-adv-kernelland/hard-interface.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/hard-interface.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/hash.c =================================================================== --- trunk/batman-adv-kernelland/hash.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/hash.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2006-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2006-2009 B.A.T.M.A.N. contributors: + * * Simon Wunderlich, Marek Lindner + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/hash.h =================================================================== --- trunk/batman-adv-kernelland/hash.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/hash.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2006-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2006-2009 B.A.T.M.A.N. contributors: + * * Simon Wunderlich, Marek Lindner + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/log.c =================================================================== --- trunk/batman-adv-kernelland/log.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/log.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/log.h =================================================================== --- trunk/batman-adv-kernelland/log.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/log.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/main.c =================================================================== --- trunk/batman-adv-kernelland/main.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/main.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/main.h =================================================================== --- trunk/batman-adv-kernelland/main.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/main.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/packet.h =================================================================== --- trunk/batman-adv-kernelland/packet.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/packet.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/proc.c =================================================================== --- trunk/batman-adv-kernelland/proc.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/proc.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/proc.h =================================================================== --- trunk/batman-adv-kernelland/proc.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/proc.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/ring_buffer.c =================================================================== --- trunk/batman-adv-kernelland/ring_buffer.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/ring_buffer.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/ring_buffer.h =================================================================== --- trunk/batman-adv-kernelland/ring_buffer.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/ring_buffer.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/routing.c =================================================================== --- trunk/batman-adv-kernelland/routing.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/routing.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/routing.h =================================================================== --- trunk/batman-adv-kernelland/routing.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/routing.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/send.c =================================================================== --- trunk/batman-adv-kernelland/send.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/send.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/send.h =================================================================== --- trunk/batman-adv-kernelland/send.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/send.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/soft-interface.c =================================================================== --- trunk/batman-adv-kernelland/soft-interface.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/soft-interface.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/soft-interface.h =================================================================== --- trunk/batman-adv-kernelland/soft-interface.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/soft-interface.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/translation-table.c =================================================================== --- trunk/batman-adv-kernelland/translation-table.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/translation-table.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/translation-table.h =================================================================== --- trunk/batman-adv-kernelland/translation-table.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/translation-table.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/types.h =================================================================== --- trunk/batman-adv-kernelland/types.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/types.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2007-2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: + * * Marek Lindner, Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/vis.c =================================================================== --- trunk/batman-adv-kernelland/vis.c 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/vis.c 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2008-2009 B.A.T.M.A.N. contributors: + * * Simon Wunderlich + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. Modified: trunk/batman-adv-kernelland/vis.h =================================================================== --- trunk/batman-adv-kernelland/vis.h 2009-11-04 23:12:40 UTC (rev 1461) +++ trunk/batman-adv-kernelland/vis.h 2009-11-07 10:59:00 UTC (rev 1462) @@ -1,6 +1,8 @@ /* - * Copyright (C) 2008 B.A.T.M.A.N. contributors: + * Copyright (C) 2008-2009 B.A.T.M.A.N. contributors: + * * Simon Wunderlich, Marek Lindner + * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation.

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r1472 - trunk/batman-adv-kernelland

by postmaster＠open-mesh.net

Author: marek Date: 2009-11-07 14:10:40 +0000 (Sat, 07 Nov 2009) New Revision: 1472 Modified: trunk/batman-adv-kernelland/CHANGELOG Log: [batman-adv] update Changelog Modified: trunk/batman-adv-kernelland/CHANGELOG =================================================================== --- trunk/batman-adv-kernelland/CHANGELOG 2009-11-07 14:04:18 UTC (rev 1471) +++ trunk/batman-adv-kernelland/CHANGELOG 2009-11-07 14:10:40 UTC (rev 1472) @@ -1,3 +1,18 @@ +batman-adv 0.2: +* support latest kernels (2.6.20 - 2.6.31) +* temporary routing loops / TTL code bug / ghost entries in originator table fixed +* internal packet queue for packet aggregation & transmission retry (ARQ) + for payload broadcasts added +* interface detection converted to event based handling to avoid timers +* major linux coding style adjustments applied +* all kernel version compatibility functions has been moved to compat.h +* use random ethernet address generator from the kernel +* /sys/module/batman_adv/version to export kernel module version +* vis: secondary interface export for dot draw format + JSON output format added +* many bugs (alignment issues, race conditions, deadlocks, etc) squashed + + -- Sat, 07 Nov 2009 15:44:31 +0100 + batman-adv 0.1: * support latest kernels (2.6.20 - 2.6.28)

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r1471 - trunk/batman-adv-kernelland

by postmaster＠open-mesh.net

Author: simon Date: 2009-11-07 14:04:18 +0000 (Sat, 07 Nov 2009) New Revision: 1471 Modified: trunk/batman-adv-kernelland/device.c Log: unlock in bat_device_add_packet() before returning (thanks Sven) Modified: trunk/batman-adv-kernelland/device.c =================================================================== --- trunk/batman-adv-kernelland/device.c 2009-11-07 13:50:40 UTC (rev 1470) +++ trunk/batman-adv-kernelland/device.c 2009-11-07 14:04:18 UTC (rev 1471) @@ -306,6 +306,7 @@ /* while waiting for the lock the device_client could have been * deleted */ if (!device_client_hash[icmp_packet->uid]) { + spin_unlock(&device_client->lock); kfree(device_packet); return; }

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r1470 - trunk/batman-adv-kernelland

by postmaster＠open-mesh.net

Author: marek Date: 2009-11-07 13:50:40 +0000 (Sat, 07 Nov 2009) New Revision: 1470 Modified: trunk/batman-adv-kernelland/proc.c Log: Remove unknown escape string \{ Signed-off-by: Sven Eckelmann <sven.eckelmann(a)gmx.de> Modified: trunk/batman-adv-kernelland/proc.c =================================================================== --- trunk/batman-adv-kernelland/proc.c 2009-11-07 13:45:41 UTC (rev 1469) +++ trunk/batman-adv-kernelland/proc.c 2009-11-07 13:50:40 UTC (rev 1470) @@ -541,7 +541,7 @@ if (current_format == DOT_DRAW) { addr_to_string(tmp_addr_str, info->packet.vis_orig); - seq_printf(seq, "\tsubgraph \"cluster_%s\" \{\n", tmp_addr_str); + seq_printf(seq, "\tsubgraph \"cluster_%s\" {\n", tmp_addr_str); while (if_entries != NULL) { addr_to_string(tmp_addr_str, if_entries->addr);

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r1469 - trunk/batman-adv-kernelland

by postmaster＠open-mesh.net

Author: marek Date: 2009-11-07 13:45:41 +0000 (Sat, 07 Nov 2009) New Revision: 1469 Modified: trunk/batman-adv-kernelland/aggregation.c trunk/batman-adv-kernelland/hard-interface.c trunk/batman-adv-kernelland/proc.c trunk/batman-adv-kernelland/routing.c trunk/batman-adv-kernelland/soft-interface.c trunk/batman-adv-kernelland/translation-table.c trunk/batman-adv-kernelland/vis.c Log: Mark local symbols as static Signed-off-by: Sven Eckelmann <sven.eckelmann(a)gmx.de> Modified: trunk/batman-adv-kernelland/aggregation.c =================================================================== --- trunk/batman-adv-kernelland/aggregation.c 2009-11-07 13:29:35 UTC (rev 1468) +++ trunk/batman-adv-kernelland/aggregation.c 2009-11-07 13:45:41 UTC (rev 1469) @@ -88,7 +88,7 @@ } /* create a new aggregated packet and add this packet to it */ -void new_aggregated_packet(unsigned char *packet_buff, +static void new_aggregated_packet(unsigned char *packet_buff, int packet_len, unsigned long send_time, bool direct_link, Modified: trunk/batman-adv-kernelland/hard-interface.c =================================================================== --- trunk/batman-adv-kernelland/hard-interface.c 2009-11-07 13:29:35 UTC (rev 1468) +++ trunk/batman-adv-kernelland/hard-interface.c 2009-11-07 13:45:41 UTC (rev 1469) @@ -72,7 +72,7 @@ return min_mtu; } -void check_known_mac_addr(uint8_t *addr) +static void check_known_mac_addr(uint8_t *addr) { struct batman_if *batman_if; char mac_string[ETH_STR_LEN]; @@ -105,7 +105,7 @@ } /* checks if the interface is up. (returns 1 if it is) */ -int hardif_is_interface_up(char *dev) +static int hardif_is_interface_up(char *dev) { struct net_device *net_dev; @@ -176,7 +176,7 @@ } /* (re)activate given interface. */ -void hardif_activate_interface(struct batman_if *batman_if) +static void hardif_activate_interface(struct batman_if *batman_if) { struct sockaddr_ll bind_addr; int retval; Modified: trunk/batman-adv-kernelland/proc.c =================================================================== --- trunk/batman-adv-kernelland/proc.c 2009-11-07 13:29:35 UTC (rev 1468) +++ trunk/batman-adv-kernelland/proc.c 2009-11-07 13:45:41 UTC (rev 1469) @@ -30,7 +30,7 @@ #include "vis.h" #include "compat.h" -uint8_t vis_format = DOT_DRAW; +static uint8_t vis_format = DOT_DRAW; static struct proc_dir_entry *proc_batman_dir, *proc_interface_file; static struct proc_dir_entry *proc_orig_interval_file, *proc_originators_file; Modified: trunk/batman-adv-kernelland/routing.c =================================================================== --- trunk/batman-adv-kernelland/routing.c 2009-11-07 13:29:35 UTC (rev 1468) +++ trunk/batman-adv-kernelland/routing.c 2009-11-07 13:45:41 UTC (rev 1469) @@ -46,7 +46,7 @@ static atomic_t data_ready_cond; atomic_t exit_cond; -void start_purge_timer(void) +static void start_purge_timer(void) { queue_delayed_work(bat_event_workqueue, &purge_orig_wq, 1 * HZ); } @@ -618,7 +618,7 @@ start_purge_timer(); } -int receive_raw_packet(struct socket *raw_sock, unsigned char *packet_buff, int packet_buff_len) +static int receive_raw_packet(struct socket *raw_sock, unsigned char *packet_buff, int packet_buff_len) { struct kvec iov; struct msghdr msg; Modified: trunk/batman-adv-kernelland/soft-interface.c =================================================================== --- trunk/batman-adv-kernelland/soft-interface.c 2009-11-07 13:29:35 UTC (rev 1468) +++ trunk/batman-adv-kernelland/soft-interface.c 2009-11-07 13:45:41 UTC (rev 1469) @@ -68,7 +68,7 @@ return (memcmp(mainIfAddr, mainIfAddr_default, ETH_ALEN) != 0 ? 1 : 0); } -int my_skb_push(struct sk_buff *skb, unsigned int len) +static int my_skb_push(struct sk_buff *skb, unsigned int len) { int result = 0; Modified: trunk/batman-adv-kernelland/translation-table.c =================================================================== --- trunk/batman-adv-kernelland/translation-table.c 2009-11-07 13:29:35 UTC (rev 1468) +++ trunk/batman-adv-kernelland/translation-table.c 2009-11-07 13:45:41 UTC (rev 1469) @@ -32,7 +32,7 @@ atomic_t hna_local_changed; DEFINE_SPINLOCK(hna_local_hash_lock); -DEFINE_SPINLOCK(hna_global_hash_lock); +static DEFINE_SPINLOCK(hna_global_hash_lock); static DECLARE_DELAYED_WORK(hna_local_purge_wq, hna_local_purge); Modified: trunk/batman-adv-kernelland/vis.c =================================================================== --- trunk/batman-adv-kernelland/vis.c 2009-11-07 13:29:35 UTC (rev 1468) +++ trunk/batman-adv-kernelland/vis.c 2009-11-07 13:45:41 UTC (rev 1469) @@ -369,7 +369,7 @@ return 0; } -void purge_vis_packets(void) +static void purge_vis_packets(void) { struct hash_it_t *hashit = NULL; struct vis_info *info;

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r1468 - trunk/batman-adv-kernelland

by postmaster＠open-mesh.net

Author: simon Date: 2009-11-07 13:29:35 +0000 (Sat, 07 Nov 2009) New Revision: 1468 Modified: trunk/batman-adv-kernelland/hard-interface.c Log: fix memory leak when there is a problem adding an interface Modified: trunk/batman-adv-kernelland/hard-interface.c =================================================================== --- trunk/batman-adv-kernelland/hard-interface.c 2009-11-07 13:21:17 UTC (rev 1467) +++ trunk/batman-adv-kernelland/hard-interface.c 2009-11-07 13:29:35 UTC (rev 1468) @@ -400,6 +400,8 @@ return 1; out: + if (batman_if->packet_buff) + kfree(batman_if->packet_buff); kfree(batman_if); kfree(dev); return -1;

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r1467 - trunk/batman-adv-kernelland

by postmaster＠open-mesh.net

Author: simon Date: 2009-11-07 13:21:17 +0000 (Sat, 07 Nov 2009) New Revision: 1467 Modified: trunk/batman-adv-kernelland/bitarray.h Log: remove obsolete functions from bitarray.h (thanks Sven) Modified: trunk/batman-adv-kernelland/bitarray.h =================================================================== --- trunk/batman-adv-kernelland/bitarray.h 2009-11-07 12:50:34 UTC (rev 1466) +++ trunk/batman-adv-kernelland/bitarray.h 2009-11-07 13:21:17 UTC (rev 1467) @@ -24,9 +24,6 @@ #define TYPE_OF_WORD unsigned long #define WORD_BIT_SIZE (sizeof(TYPE_OF_WORD) * 8) -/* clear the bits, ready for use */ -void bit_init(TYPE_OF_WORD *seq_bits); - /* returns true if the corresponding bit in the given seq_bits indicates true * and curr_seqno is within range of last_seqno */ uint8_t get_bit_status(TYPE_OF_WORD *seq_bits, uint16_t last_seqno, @@ -46,6 +43,3 @@ /* count the hamming weight, how many good packets did we receive? */ int bit_packet_count(TYPE_OF_WORD *seq_bits); - -/* print the packet array, for debugging purposes */ -char *bit_print(TYPE_OF_WORD *seq_bits);

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r1461 - trunk/batctl

by postmaster＠open-mesh.net

Author: marek Date: 2009-11-04 23:12:40 +0000 (Wed, 04 Nov 2009) New Revision: 1461 Modified: trunk/batctl/bisect.c trunk/batctl/bisect.h Log: [batctl] bisect - fix wrongly detected routing loops Modified: trunk/batctl/bisect.c =================================================================== --- trunk/batctl/bisect.c 2009-11-04 23:12:34 UTC (rev 1460) +++ trunk/batctl/bisect.c 2009-11-04 23:12:40 UTC (rev 1461) @@ -251,6 +251,7 @@ rt_hist->prev_rt_hist = NULL; rt_hist->next_hop = next_hop_node; rt_hist->flags = rt_flag; + memset(rt_hist->loop_magic, 0, sizeof(rt_hist->loop_magic)); if (!(list_empty(&orig_event->rt_hist_list))) rt_hist->prev_rt_hist = (struct rt_hist *)(orig_event->rt_hist_list.prev); @@ -606,8 +607,8 @@ list_for_each_entry(seqno_event, &orig_event->event_list, list) { if (seqno_event->seqno > seqno) + break; - break; if (seqno_event->rt_hist) rt_hist = seqno_event->rt_hist; } @@ -696,9 +697,15 @@ { struct orig_event *orig_event; struct rt_hist *rt_hist, *rt_hist_tmp; - char curr_loop_magic[LOOP_MAGIC_LEN]; - int res; + char curr_loop_magic[LOOP_MAGIC_LEN], loop_check = 0; + int res, seqno_tmp, seqno_min_tmp = seqno_min; + /* printf("%i: curr_node: %s ", bla, + get_name_by_macstr(curr_node->name, read_opt)); + + printf("dst_node: %s [%i - %i]\n", + get_name_by_macstr(dst_node->name, read_opt), seqno_min, seqno_max); */ + /* recursion ends here */ if (curr_node == dst_node) { rt_hist = get_rt_hist_by_node_seqno(src_node, dst_node, seqno_max); @@ -712,20 +719,8 @@ memset(curr_loop_magic, 0, LOOP_MAGIC_LEN); snprintf(curr_loop_magic, LOOP_MAGIC_LEN, "%s%s%i%i", src_node->name, dst_node->name, - seqno_min, seqno_rand); + seqno_min_tmp, seqno_rand); - /* we are running in a loop */ - if (memcmp(curr_loop_magic, curr_node->loop_magic2, LOOP_MAGIC_LEN) == 0) { - rt_hist = get_rt_hist_by_node_seqno(src_node, dst_node, seqno_max); - - if (rt_hist) - print_rt_path_at_seqno(src_node, dst_node, rt_hist->next_hop, - seqno_max, seqno_rand, read_opt); - goto out; - } - - memcpy(curr_node->loop_magic2, curr_loop_magic, sizeof(curr_node->loop_magic)); - orig_event = orig_event_get_by_ptr(curr_node, dst_node); if (!orig_event) goto out; @@ -737,20 +732,36 @@ continue; } - if ((seqno_min != -1) && (rt_hist->seqno_event->seqno < seqno_min)) + if ((seqno_min_tmp != -1) && (rt_hist->seqno_event->seqno < seqno_min_tmp)) continue; if ((seqno_max != -1) && (rt_hist->seqno_event->seqno >= seqno_max)) continue; - /* printf("validate route after change (seqno %i) of next hop: %s\n", + /* we are running in a loop */ + if (memcmp(curr_loop_magic, rt_hist->loop_magic, LOOP_MAGIC_LEN) == 0) { + rt_hist_tmp = get_rt_hist_by_node_seqno(src_node, dst_node, + rt_hist->seqno_event->seqno); + + if (rt_hist_tmp) + print_rt_path_at_seqno(src_node, dst_node, rt_hist_tmp->next_hop, + rt_hist->seqno_event->seqno, seqno_rand, read_opt); + goto loop; + } + + memcpy(rt_hist->loop_magic, curr_loop_magic, sizeof(rt_hist->loop_magic)); + loop_check = 1; + + /* printf("validate route after change (seqno %i) at node: %s\n", rt_hist->seqno_event->seqno, - get_name_by_macstr(rt_hist->next_hop->name, read_opt));*/ + get_name_by_macstr(curr_node->name, read_opt)); */ res = find_rt_table_change(src_node, dst_node, rt_hist->next_hop, - seqno_min, rt_hist->seqno_event->seqno, - seqno_rand, read_opt); + seqno_min_tmp, rt_hist->seqno_event->seqno, + seqno_rand, read_opt); + seqno_min_tmp = rt_hist->seqno_event->seqno + 1; + /* find_rt_table_change() did not run into a loop and printed the path */ if (res == 0) continue; @@ -768,14 +779,42 @@ rt_hist->seqno_event->seqno, seqno_rand, read_opt); } - rt_hist = get_rt_hist_by_seqno(orig_event, seqno_max - 1); + /** + * if we have no routing table changes within the seqno range + * the loop detection above won't be triggered + **/ + if (!loop_check) { + if (memcmp(curr_loop_magic, curr_node->loop_magic2, LOOP_MAGIC_LEN) == 0) { + rt_hist_tmp = get_rt_hist_by_node_seqno(src_node, dst_node, seqno_min); + if (rt_hist_tmp) + print_rt_path_at_seqno(src_node, dst_node, rt_hist_tmp->next_hop, + seqno_min, seqno_rand, read_opt); + + /* no need to print the path twice */ + if (seqno_min == seqno_max) + goto out; + else + goto loop; + } + + memcpy(curr_node->loop_magic2, curr_loop_magic, sizeof(curr_node->loop_magic2)); + } + + seqno_tmp = seqno_max - 1; + if (seqno_min == seqno_max) + seqno_tmp = seqno_max; + + rt_hist = get_rt_hist_by_seqno(orig_event, seqno_tmp); + if (rt_hist) return find_rt_table_change(src_node, dst_node, rt_hist->next_hop, - seqno_min, seqno_max, seqno_rand, read_opt); + seqno_min_tmp, seqno_max, seqno_rand, read_opt); out: return -1; +loop: + return -2; } static void loop_detection(char *loop_orig, int seqno_min, int seqno_max, char *filter_orig, int read_opt) @@ -784,7 +823,7 @@ struct orig_event *orig_event; struct hash_it_t *hashit = NULL; struct rt_hist *rt_hist, *prev_rt_hist; - int last_seqno = -1, seqno_count = 0; + int last_seqno = -1, seqno_count = 0, res; char check_orig[NAME_LEN]; printf("\nAnalyzing routing tables "); @@ -880,19 +919,25 @@ goto validate_path; } - /*printf("\n=> checking orig %s in seqno range of: %i - %i ", + if (rt_hist->seqno_event->seqno == prev_rt_hist->seqno_event->seqno + 1) + goto validate_path; + + /* printf("\n=> checking orig %s in seqno range of: %i - %i ", get_name_by_macstr(rt_hist->seqno_event->orig->name, read_opt), prev_rt_hist->seqno_event->seqno + 1, rt_hist->seqno_event->seqno); printf("(prev nexthop: %s)\n", - get_name_by_macstr(prev_rt_hist->next_hop->name, read_opt));*/ + get_name_by_macstr(prev_rt_hist->next_hop->name, read_opt)); */ - find_rt_table_change(bat_node, rt_hist->seqno_event->orig, prev_rt_hist->next_hop, - prev_rt_hist->seqno_event->seqno + 1, rt_hist->seqno_event->seqno, - seqno_count, read_opt); + res = find_rt_table_change(bat_node, rt_hist->seqno_event->orig, + prev_rt_hist->next_hop, + prev_rt_hist->seqno_event->seqno + 1, + rt_hist->seqno_event->seqno, + seqno_count, read_opt); - continue; + if (res != -2) + continue; } validate_path: Modified: trunk/batctl/bisect.h =================================================================== --- trunk/batctl/bisect.h 2009-11-04 23:12:34 UTC (rev 1460) +++ trunk/batctl/bisect.h 2009-11-04 23:12:40 UTC (rev 1461) @@ -60,6 +60,7 @@ struct seqno_event *seqno_event; struct bat_node *next_hop; char flags; + char loop_magic[LOOP_MAGIC_LEN]; }; struct rt_entry {

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r1460 - trunk/batman-adv-kernelland

by postmaster＠open-mesh.net

Author: marek Date: 2009-11-04 23:12:34 +0000 (Wed, 04 Nov 2009) New Revision: 1460 Modified: trunk/batman-adv-kernelland/routing.c Log: [batman-adv] avoid temporary routing loops Modified: trunk/batman-adv-kernelland/routing.c =================================================================== --- trunk/batman-adv-kernelland/routing.c 2009-10-26 20:48:30 UTC (rev 1459) +++ trunk/batman-adv-kernelland/routing.c 2009-11-04 23:12:34 UTC (rev 1460) @@ -344,18 +344,28 @@ tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? batman_packet->num_hna * ETH_ALEN : hna_buff_len); - /** - * if we got have a better tq value via this neighbour or - * same tq value but the link is more symetric change the next hop - * router - */ - if ((orig_node->router != neigh_node) && ((!orig_node->router) || - (neigh_node->tq_avg > orig_node->router->tq_avg) || - ((neigh_node->tq_avg == orig_node->router->tq_avg) && - (neigh_node->orig_node->bcast_own_sum[if_incoming->if_num] > orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num])))) - update_routes(orig_node, neigh_node, hna_buff, tmp_hna_buff_len); - else - update_routes(orig_node, orig_node->router, hna_buff, tmp_hna_buff_len); + /* if this neighbor already is our next hop there is nothing to change */ + if (orig_node->router == neigh_node) + goto update_hna; + + /* if this neighbor does not offer a better TQ we won't consider it */ + if ((orig_node->router) && + (orig_node->router->tq_avg > neigh_node->tq_avg)) + goto update_hna; + + /* if the TQ is the same and the link not more symetric we won't consider it either */ + if ((orig_node->router) && + ((neigh_node->tq_avg == orig_node->router->tq_avg) && + (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num] > + neigh_node->orig_node->bcast_own_sum[if_incoming->if_num]))) + goto update_hna; + + update_routes(orig_node, neigh_node, hna_buff, tmp_hna_buff_len); + return; + +update_hna: + update_routes(orig_node, orig_node->router, hna_buff, tmp_hna_buff_len); + return; } static char count_real_packets(struct ethhdr *ethhdr, struct batman_packet *batman_packet, struct batman_if *if_incoming) @@ -402,7 +412,7 @@ /* Silently drop when the batman packet is actually not a correct packet. * - * This might happen if a packet is padded (e.g. Ethernet has a + * This might happen if a packet is padded (e.g. Ethernet has a * minimum frame length of 64 byte) and the aggregation interprets * it as an additional length. * @@ -491,6 +501,15 @@ if (orig_node == NULL) return; + /* avoid temporary routing loops */ + if ((orig_node->router) && (orig_node->router->orig_node->router) && + (compare_orig(orig_node->router->addr, batman_packet->prev_sender)) && + !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) && + (compare_orig(orig_node->router->addr, orig_node->router->orig_node->router->addr))) { + debug_log(LOG_TYPE_BATMAN, "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %s) \n", neigh_str); + return; + } + /* if sender is a direct neighbor the sender mac equals originator mac */ orig_neigh_node = (is_single_hop_neigh ? orig_node : get_orig_node(ethhdr->h_source)); if (orig_neigh_node == NULL)

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