From 1c01fe14a87332cc88266fbd6e598319322eb96f Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Wed, 10 Mar 2010 10:30:19 +0000 Subject: [PATCH] net: forbid underlaying devices to change its type It's not desired for underlaying devices to change type. At the time, there is for example possible to have bond with changed type from Ethernet to Infiniband as a port of a bridge. This patch fixes this. Signed-off-by: Jiri Pirko Signed-off-by: Jay Vosburgh Signed-off-by: David S. Miller --- drivers/net/macvlan.c | 3 +++ net/8021q/vlan.c | 4 ++++ net/bridge/br_notify.c | 4 ++++ 3 files changed, 11 insertions(+) diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index 40faa368b07a..445e73c343ba 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -748,6 +748,9 @@ static int macvlan_device_event(struct notifier_block *unused, list_for_each_entry_safe(vlan, next, &port->vlans, list) vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL); break; + case NETDEV_PRE_TYPE_CHANGE: + /* Forbid underlaying device to change its type. */ + return NOTIFY_BAD; } return NOTIFY_DONE; } diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c index 453512266ea1..c39a5f41169c 100644 --- a/net/8021q/vlan.c +++ b/net/8021q/vlan.c @@ -530,6 +530,10 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event, } unregister_netdevice_many(&list); break; + + case NETDEV_PRE_TYPE_CHANGE: + /* Forbid underlaying device to change its type. */ + return NOTIFY_BAD; } out: diff --git a/net/bridge/br_notify.c b/net/bridge/br_notify.c index 763a3ec292e5..1413b72acc7f 100644 --- a/net/bridge/br_notify.c +++ b/net/bridge/br_notify.c @@ -82,6 +82,10 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v case NETDEV_UNREGISTER: br_del_if(br, dev); break; + + case NETDEV_PRE_TYPE_CHANGE: + /* Forbid underlaying device to change its type. */ + return NOTIFY_BAD; } /* Events that may cause spanning tree to refresh */