netdev - [net-next-2.6 PATCH 3/3] net: forbid underlaying devices to change its type

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Date:	Wed, 10 Mar 2010 21:30:19 +0100
From:	Jiri Pirko <jpirko@...hat.com>
To:	netdev@...r.kernel.org
Cc:	fubar@...ibm.com, bonding-devel@...ts.sourceforge.net,
	davem@...emloft.net, shemminger@...ux-foundation.org,
	kaber@...sh.net
Subject: [net-next-2.6 PATCH 3/3] 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 <jpirko@...hat.com>
---
 drivers/net/macvlan.c  |    3 +++
 net/8021q/vlan.c       |    4 ++++
 net/bridge/br_notify.c |    4 ++++
 3 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 40faa36..445e73c 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 4535122..c39a5f4 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 763a3ec..1413b72 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 */
-- 
1.6.6.1

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