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

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commit d8e42a2b0addf238be8b3b37dcd9795a5c1be459 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>
This commit is contained in:
Sven Eckelmann
2023-07-19 10:01:15 +02:00
committed by Greg Kroah-Hartman
parent 480f2a129d
commit 7c09590883
3 changed files with 22 additions and 1 deletions
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14
net/batman-adv/hard-interface.c
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@@ -632,7 +632,19 @@ out:
*/
void batadv_update_min_mtu(struct net_device *soft_iface)
{
dev_set_mtu(soft_iface, batadv_hardif_min_mtu(soft_iface));
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
int limit_mtu;
int mtu;
mtu = batadv_hardif_min_mtu(soft_iface);
if (bat_priv->mtu_set_by_user)
limit_mtu = bat_priv->mtu_set_by_user;
else
limit_mtu = ETH_DATA_LEN;
mtu = min(mtu, limit_mtu);
dev_set_mtu(soft_iface, mtu);
/* Check if the local translate table should be cleaned up to match a
* new (and smaller) MTU.