[B.A.T.M.A.N.] batman-adv 2014.1.0 released

[B.A.T.M.A.N.] batman-adv 2014.1.0 released

[Marek Lindner]

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The B.A.T.M.A.N. developers are happy to present batman-adv 2014.1.0, 
stabilizing the feature-packed 2014.0.0 release while also pushing routing 
improvements and other smaller features. As the kernel module always depends 
on the Linux kernel it is compiled against, it does not make sense to provide 
binaries on our website. As usual, you will find the signed tarballs in our 
download section:

http://downloads.open-mesh.org/batman/releases/batman-adv-2014.1.0/

as well as prepackaged binaries in your distribution.

Thanks
------

Thanks to all people sending in patches:

 * Antonio Quartulli <antonio@meshcoding.com>
 * Linus Lüssing <linus.luessing@web.de>
 * Marek Lindner <mareklindner@neomailbox.ch>
 * Simon Wunderlich <sw@simonwunderlich.de>
 * Stephen Hemminger <stephen@networkplumber.org>
 * Sven Eckelmann <sven@narfation.org>
 * Ying Xue <ying.xue@windriver.com>

Special thanks to Russell Senior for his vigorous testing and debugging 
efforts.


batman-adv
----------

After having accomplished the heavy infrastructure lifting with the previous 
release, the attention shifted towards batman-adv's core functionality - 
routing packets - once more. The forwarding mechanism of the mesh protocol 
messages (OGMs) was revamped to allow applying rules when packets are 
forwarded from one interface to another. For example, when the same interface 
is used for sending and receiving, there might be throughput degradation on 
half-duplex interfaces such as WiFi which is now reflected in the metric. At 
the same time, packets switching interfaces (incoming interface is not equal 
to the outgoing one) do not get handicapped, effectively favoring interface 
switching. To pull all this together, batman-adv now maintains a routing table 
per interface (plus the default routing table) which essentially allows the 
kernel module to route traffic based on network wide multi-interface 
information.

Also new on board is the extended AP isolation, aiming to grant fine-grained 
isolation control by working with a user specified 'skb mark'. Incoming 
broadcast packets carrying the specified skb mark are flagged as 'isolated' 
(translation table flag). Isolated packets received over the mesh are 
transformed back to an skb with a mark before they are forwarded to the upper 
layers. There, the packets can be filtered, dropped, etc by netfilter and 
friends based on the skb mark.

The DHCP packet handling scope was widened to force all DHCP packet types to 
unicast transmission (with the gateway feature enabled), covering older / 
unusual DHCP client implementations. Previously, only DHCP discover packets 
were forwarded as unicast. The MTU overhead calculation did not consider the 
prepended Ethernet header before setting dev->hard_header_len leading to 
fragmented packets. Also removed was the 1500 bytes MTU limit on the batX 
interface by improving the maximum MTU computation. A potential kernel crash 
on skb reallocation was fixed along numerous problems in the translation table 
component and a memory leak in the newly introduced TVLV infrastructure code.


batctl
------

The recent switch to the RTNL API was further enriched by replacing the custom 
RTNL code with the libnl library to reduce maintenance burden and security 
risks. The batctl Makefile attempts to locate the libnl library by itself as 
well as tries to determine the compiler options, thereby facilitating the 
build process.

To monitor the per-interface routing tables, batctl gained the ability to 
retrieve the routing table of a particular interface (the local routing table 
is shown per default). Also, the extended AP isolation mark/mask pair can be 
configured through batctl.


alfred
------

Fixed was a file descriptor leak in the batadv-vis component which is part of 
the alfred package. Over a longer period time file descriptors were opened and 
'lost', leading batadv-vis to eventually hit the open file limit and stop 
normal operation.


Happy routing,
The B.A.T.M.A.N. team

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