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Merge tag 'batadv-net-pullrequest-20250509' of git://git.open-mesh.org/linux-merge

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Simon Wunderlich says:

====================
Here is a batman-adv bugfix:

 - fix duplicate MAC address check, by Matthias Schiffer

* tag 'batadv-net-pullrequest-20250509' of git://git.open-mesh.org/linux-merge:
  batman-adv: fix duplicate MAC address check
====================

Link: https://patch.msgid.link/20250509090240.107796-1-sw@simonwunderlich.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski
2025-05-09 17:09:39 -07:00
parent e4f349bd6e 8772cc49e0
commit 4d64321c4f
1 changed files with 18 additions and 13 deletions
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31
net/batman-adv/hard-interface.c
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@@ -506,28 +506,32 @@ batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
return false;
}
static void batadv_check_known_mac_addr(const struct net_device *net_dev)
static void batadv_check_known_mac_addr(const struct batadv_hard_iface *hard_iface)
{
const struct batadv_hard_iface *hard_iface;
const struct net_device *mesh_iface = hard_iface->mesh_iface;
const struct batadv_hard_iface *tmp_hard_iface;
rcu_read_lock();
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
if (hard_iface->if_status != BATADV_IF_ACTIVE &&
hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
if (!mesh_iface)
return;
list_for_each_entry(tmp_hard_iface, &batadv_hardif_list, list) {
if (tmp_hard_iface == hard_iface)
continue;
if (hard_iface->net_dev == net_dev)
if (tmp_hard_iface->mesh_iface != mesh_iface)
continue;
if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
net_dev->dev_addr))
if (tmp_hard_iface->if_status == BATADV_IF_NOT_IN_USE)
continue;
if (!batadv_compare_eth(tmp_hard_iface->net_dev->dev_addr,
hard_iface->net_dev->dev_addr))
continue;
pr_warn("The newly added mac address (%pM) already exists on: %s\n",
net_dev->dev_addr, hard_iface->net_dev->name);
hard_iface->net_dev->dev_addr, tmp_hard_iface->net_dev->name);
pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
}
rcu_read_unlock();
}
/**
@@ -763,6 +767,8 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
hard_iface->net_dev->name, hardif_mtu,
required_mtu);
batadv_check_known_mac_addr(hard_iface);
if (batadv_hardif_is_iface_up(hard_iface))
batadv_hardif_activate_interface(hard_iface);
else
@@ -901,7 +907,6 @@ batadv_hardif_add_interface(struct net_device *net_dev)
batadv_v_hardif_init(hard_iface);
batadv_check_known_mac_addr(hard_iface->net_dev);
kref_get(&hard_iface->refcount);
list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
batadv_hardif_generation++;
@@ -988,7 +993,7 @@ static int batadv_hard_if_event(struct notifier_block *this,
if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
goto hardif_put;
batadv_check_known_mac_addr(hard_iface->net_dev);
batadv_check_known_mac_addr(hard_iface);
bat_priv = netdev_priv(hard_iface->mesh_iface);
bat_priv->algo_ops->iface.update_mac(hard_iface);