9be6dd6510
This ensures the neighbor entries associated with the bridge dev are flushed, also invalidating the associated cached L2 headers. This means we br_add_if/br_del_if ports to implement hand-over and not wind up with bridge packets going out with stale MAC. This means we can also change MAC of port device and also not wind up with bridge packets going out with stale MAC. This builds on Stephen Hemminger's patch, also handling the br_del_if case and the port MAC change case. Cc: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: Andrei Warkentin <andreiw@motorola.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/*
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* Device event handling
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* Linux ethernet bridge
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*
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/rtnetlink.h>
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#include <net/net_namespace.h>
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#include "br_private.h"
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static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
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struct notifier_block br_device_notifier = {
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.notifier_call = br_device_event
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};
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/*
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* Handle changes in state of network devices enslaved to a bridge.
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*
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* Note: don't care about up/down if bridge itself is down, because
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* port state is checked when bridge is brought up.
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*/
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static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
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{
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struct net_device *dev = ptr;
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struct net_bridge_port *p;
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struct net_bridge *br;
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bool changed_addr;
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int err;
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/* register of bridge completed, add sysfs entries */
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if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
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br_sysfs_addbr(dev);
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return NOTIFY_DONE;
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}
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/* not a port of a bridge */
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p = br_port_get_rtnl(dev);
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if (!p)
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return NOTIFY_DONE;
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br = p->br;
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switch (event) {
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case NETDEV_CHANGEMTU:
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dev_set_mtu(br->dev, br_min_mtu(br));
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break;
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case NETDEV_CHANGEADDR:
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spin_lock_bh(&br->lock);
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br_fdb_changeaddr(p, dev->dev_addr);
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changed_addr = br_stp_recalculate_bridge_id(br);
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spin_unlock_bh(&br->lock);
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if (changed_addr)
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call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
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break;
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case NETDEV_CHANGE:
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br_port_carrier_check(p);
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break;
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case NETDEV_FEAT_CHANGE:
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netdev_update_features(br->dev);
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break;
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case NETDEV_DOWN:
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spin_lock_bh(&br->lock);
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if (br->dev->flags & IFF_UP)
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br_stp_disable_port(p);
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spin_unlock_bh(&br->lock);
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break;
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case NETDEV_UP:
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if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
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spin_lock_bh(&br->lock);
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br_stp_enable_port(p);
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spin_unlock_bh(&br->lock);
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}
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break;
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case NETDEV_UNREGISTER:
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br_del_if(br, dev);
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break;
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case NETDEV_CHANGENAME:
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err = br_sysfs_renameif(p);
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if (err)
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return notifier_from_errno(err);
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break;
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case NETDEV_PRE_TYPE_CHANGE:
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/* Forbid underlaying device to change its type. */
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return NOTIFY_BAD;
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}
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/* Events that may cause spanning tree to refresh */
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if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
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event == NETDEV_CHANGE || event == NETDEV_DOWN)
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br_ifinfo_notify(RTM_NEWLINK, p);
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return NOTIFY_DONE;
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}
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