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8772cc49e0
batadv_check_known_mac_addr() is both too lenient and too strict:
- It is called from batadv_hardif_add_interface(), which means that it
checked interfaces that are not used for batman-adv at all. Move it
to batadv_hardif_enable_interface(). Also, restrict it to hardifs of
the same mesh interface; different mesh interfaces should not interact
at all. The batadv_check_known_mac_addr() argument is changed from
`struct net_device` to `struct batadv_hard_iface` to achieve this.
- The check only cares about hardifs in BATADV_IF_ACTIVE and
BATADV_IF_TO_BE_ACTIVATED states, but interfaces in BATADV_IF_INACTIVE
state should be checked as well, or the following steps will not
result in a warning then they should:
- Add two interfaces in down state with different MAC addresses to
a mesh as hardifs
- Change the MAC addresses so they conflict
- Set interfaces to up state
Now there will be two active hardifs with the same MAC address, but no
warning. Fix by only ignoring hardifs in BATADV_IF_NOT_IN_USE state.
The RCU lock can be dropped, as we're holding RTNL anyways when the
function is called.
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.