batman-adv: Don't increase MTU when set by user

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commit d8e42a2b0a upstream.

If the user set an MTU value, it usually means that there are special
requirements for the MTU. But if an interface gots activated, the MTU was
always recalculated and then the user set value was overwritten.

The only reason why this user set value has to be overwritten, is when the
MTU has to be decreased because batman-adv is not able to transfer packets
with the user specified size.

Fixes: c6c8fea297 ("net: Add batman-adv meshing protocol")
Cc: stable@vger.kernel.org
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Sven Eckelmann 2023-07-19 10:01:15 +02:00 • committed by Greg Kroah-Hartman

parent efef746c5a

commit ed1eb19806

3 changed files with 22 additions and 1 deletions

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14

net/batman-adv/hard-interface.c

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3

net/batman-adv/soft-interface.c

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6

net/batman-adv/types.h

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