static int br_change_mtu(struct net_device *dev, int new_mtu)
{
struct net_bridge *br = netdev_priv(dev);
if (new_mtu < 68 || new_mtu > br_min_mtu(br))
return -EINVAL;
dev->mtu = new_mtu;
#ifdef CONFIG_BRIDGE_NETFILTER
/* remember the MTU in the rtable for PMTU */
br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
#endif
return 0;
}
static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
{
struct net_device *dev = ptr;
struct net_bridge_port *p = dev->br_port;
struct net_bridge *br;
int err;
/* not a port of a bridge */
if (p == NULL)
return NOTIFY_DONE;
br = p->br;
switch (event) {
case NETDEV_CHANGEMTU:
dev_set_mtu(br->dev, br_min_mtu(br));
break;
case NETDEV_CHANGEADDR:
spin_lock_bh(&br->lock);
br_fdb_changeaddr(p, dev->dev_addr);
br_stp_recalculate_bridge_id(br);
spin_unlock_bh(&br->lock);
break;
case NETDEV_CHANGE:
br_port_carrier_check(p);
break;
case NETDEV_FEAT_CHANGE:
spin_lock_bh(&br->lock);
if (netif_running(br->dev))
br_features_recompute(br);
spin_unlock_bh(&br->lock);
break;
case NETDEV_DOWN:
spin_lock_bh(&br->lock);
if (br->dev->flags & IFF_UP)
br_stp_disable_port(p);
spin_unlock_bh(&br->lock);
break;
case NETDEV_UP:
if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
spin_lock_bh(&br->lock);
br_stp_enable_port(p);
spin_unlock_bh(&br->lock);
}
break;
case NETDEV_UNREGISTER:
br_del_if(br, dev);
break;
case NETDEV_CHANGENAME:
err = br_sysfs_renameif(p);
if (err)
return notifier_from_errno(err);
break;
case NETDEV_PRE_TYPE_CHANGE:
/* Forbid underlaying device to change its type. */
return NOTIFY_BAD;
}
/* Events that may cause spanning tree to refresh */
if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
event == NETDEV_CHANGE || event == NETDEV_DOWN)
br_ifinfo_notify(RTM_NEWLINK, p);
return NOTIFY_DONE;
}
/*
* Handle changes in state of network devices enslaved to a bridge.
*
* Note: don't care about up/down if bridge itself is down, because
* port state is checked when bridge is brought up.
*/
static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct net_bridge_port *p;
struct net_bridge *br;
bool changed_addr;
int err;
/* register of bridge completed, add sysfs entries */
if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
br_sysfs_addbr(dev);
return NOTIFY_DONE;
}
/* not a port of a bridge */
p = br_port_get_rtnl(dev);
if (!p)
return NOTIFY_DONE;
br = p->br;
switch (event) {
case NETDEV_CHANGEMTU:
dev_set_mtu(br->dev, br_min_mtu(br));
break;
case NETDEV_CHANGEADDR:
spin_lock_bh(&br->lock);
br_fdb_changeaddr(p, dev->dev_addr);
changed_addr = br_stp_recalculate_bridge_id(br);
spin_unlock_bh(&br->lock);
if (changed_addr)
call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
break;
case NETDEV_CHANGE:
br_port_carrier_check(p);
break;
case NETDEV_FEAT_CHANGE:
netdev_update_features(br->dev);
break;
case NETDEV_DOWN:
spin_lock_bh(&br->lock);
if (br->dev->flags & IFF_UP)
br_stp_disable_port(p);
spin_unlock_bh(&br->lock);
break;
case NETDEV_UP:
if (netif_running(br->dev) && netif_oper_up(dev)) {
spin_lock_bh(&br->lock);
br_stp_enable_port(p);
spin_unlock_bh(&br->lock);
}
break;
case NETDEV_UNREGISTER:
br_del_if(br, dev);
break;
case NETDEV_CHANGENAME:
err = br_sysfs_renameif(p);
if (err)
return notifier_from_errno(err);
break;
case NETDEV_PRE_TYPE_CHANGE:
/* Forbid underlaying device to change its type. */
return NOTIFY_BAD;
case NETDEV_RESEND_IGMP:
/* Propagate to master device */
call_netdevice_notifiers(event, br->dev);
break;
}
/* Events that may cause spanning tree to refresh */
if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
event == NETDEV_CHANGE || event == NETDEV_DOWN)
br_ifinfo_notify(RTM_NEWLINK, p);
return NOTIFY_DONE;
}
/*
* Handle changes in state of network devices enslaved to a bridge.
*
* Note: don't care about up/down if bridge itself is down, because
* port state is checked when bridge is brought up.
*/
static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
{
struct net_device *dev = ptr;
struct net_bridge_port *p = dev->br_port;
struct net_bridge *br;
/* not a port of a bridge */
if (p == NULL)
return NOTIFY_DONE;
br = p->br;
spin_lock_bh(&br->lock);
switch (event) {
case NETDEV_CHANGEMTU:
dev_set_mtu(br->dev, br_min_mtu(br));
break;
case NETDEV_CHANGEADDR:
br_fdb_changeaddr(p, dev->dev_addr);
br_stp_recalculate_bridge_id(br);
break;
case NETDEV_CHANGE: /* device is up but carrier changed */
if (!(br->dev->flags & IFF_UP))
break;
if (netif_carrier_ok(dev)) {
if (p->state == BR_STATE_DISABLED)
br_stp_enable_port(p);
} else {
if (p->state != BR_STATE_DISABLED)
br_stp_disable_port(p);
}
break;
case NETDEV_FEAT_CHANGE:
if (br->dev->flags & IFF_UP)
br_features_recompute(br);
/* could do recursive feature change notification
* but who would care??
*/
break;
case NETDEV_DOWN:
if (br->dev->flags & IFF_UP)
br_stp_disable_port(p);
break;
case NETDEV_UP:
if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP))
br_stp_enable_port(p);
break;
case NETDEV_UNREGISTER:
spin_unlock_bh(&br->lock);
br_del_if(br, dev);
goto done;
}
spin_unlock_bh(&br->lock);
done:
return NOTIFY_DONE;
}