This is a note to let you know that I've just added the patch titled
batman-adv: Trigger events for auto adjusted MTU
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
batman-adv-trigger-events-for-auto-adjusted-mtu.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c6a953cce8d0438391e6da48c8d0793d3fbfcfa6 Mon Sep 17 00:00:00 2001
From: Sven Eckelmann <sven@xxxxxxxxxxxxx>
Date: Wed, 19 Jul 2023 09:29:29 +0200
Subject: batman-adv: Trigger events for auto adjusted MTU
From: Sven Eckelmann <sven@xxxxxxxxxxxxx>
commit c6a953cce8d0438391e6da48c8d0793d3fbfcfa6 upstream.
If an interface changes the MTU, it is expected that an NETDEV_PRECHANGEMTU
and NETDEV_CHANGEMTU notification events is triggered. This worked fine for
.ndo_change_mtu based changes because core networking code took care of it.
But for auto-adjustments after hard-interfaces changes, these events were
simply missing.
Due to this problem, non-batman-adv components weren't aware of MTU changes
and thus couldn't perform their own tasks correctly.
Fixes: c6c8fea29769 ("net: Add batman-adv meshing protocol")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sven Eckelmann <sven@xxxxxxxxxxxxx>
Signed-off-by: Simon Wunderlich <sw@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/batman-adv/hard-interface.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -643,7 +643,7 @@ out:
*/
void batadv_update_min_mtu(struct net_device *soft_iface)
{
- soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
+ dev_set_mtu(soft_iface, batadv_hardif_min_mtu(soft_iface));
/* Check if the local translate table should be cleaned up to match a
* new (and smaller) MTU.
Patches currently in stable-queue which might be from sven@xxxxxxxxxxxxx are
queue-4.19/batman-adv-fix-tt-global-entry-leak-when-client-roamed-back.patch
queue-4.19/batman-adv-don-t-increase-mtu-when-set-by-user.patch
queue-4.19/batman-adv-do-not-get-eth-header-before-batadv_check_management_packet.patch
queue-4.19/batman-adv-trigger-events-for-auto-adjusted-mtu.patch
queue-4.19/batman-adv-fix-batadv_v_ogm_aggr_send-memory-leak.patch
