This patchset introduces optimizations for batman-adv in setups having several gateways into a common (switched) Ethernet backbone network especially if dat is additionally enabled.
Using the current implementation with bla and dat enabled, several problems can be observed in a real setup: 1. Multiplication of ARP replies from dat enabled gateways and dat enabled mesh nodes leading to an "ARP reply storm" in the common backbone network. 2. In rare corner cases bla does not fully prevent looping of unicast frames in the direction Backbone --> mesh --> backbone and looping of multicast frames in the direction mesh --> backbone --> mesh. The latter can lead to temporary confusion in the switched backbone resulting in packet loss and communication timeouts.
The observed problems are solved by introduction of additional rules for the dat handling, bla packet forwarding and bla claiming/unclaiming of clients.
v3:
- rebased patchset - moved snooping of ip addresses for dat speed up into separate function - removed "patch of a patch" - removed automatic claiming during check of a claim - fixed issues of the patchset not being compiled due to chosen batman options
Kind regards, Andreas
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