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470 lines
10 KiB
470 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Generic parts |
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* Linux ethernet bridge |
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* |
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* Authors: |
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* Lennert Buytenhek <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/init.h> |
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#include <linux/llc.h> |
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#include <net/llc.h> |
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#include <net/stp.h> |
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#include <net/switchdev.h> |
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#include "br_private.h" |
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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 netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); |
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struct netdev_notifier_pre_changeaddr_info *prechaddr_info; |
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struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
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struct net_bridge_port *p; |
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struct net_bridge *br; |
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bool notified = false; |
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bool changed_addr; |
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int err; |
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if (netif_is_bridge_master(dev)) { |
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err = br_vlan_bridge_event(dev, event, ptr); |
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if (err) |
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return notifier_from_errno(err); |
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if (event == NETDEV_REGISTER) { |
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/* register of bridge completed, add sysfs entries */ |
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err = br_sysfs_addbr(dev); |
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if (err) |
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return notifier_from_errno(err); |
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return NOTIFY_DONE; |
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} |
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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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br_mtu_auto_adjust(br); |
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break; |
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case NETDEV_PRE_CHANGEADDR: |
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if (br->dev->addr_assign_type == NET_ADDR_SET) |
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break; |
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prechaddr_info = ptr; |
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err = dev_pre_changeaddr_notify(br->dev, |
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prechaddr_info->dev_addr, |
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extack); |
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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_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, ¬ified); |
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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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notified = true; |
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} |
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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_running(br->dev) && netif_oper_up(dev)) { |
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spin_lock_bh(&br->lock); |
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br_stp_enable_port(p); |
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notified = true; |
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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 underlying device to change its type. */ |
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return NOTIFY_BAD; |
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case NETDEV_RESEND_IGMP: |
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/* Propagate to master device */ |
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call_netdevice_notifiers(event, br->dev); |
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break; |
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} |
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if (event != NETDEV_UNREGISTER) |
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br_vlan_port_event(p, event); |
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/* Events that may cause spanning tree to refresh */ |
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if (!notified && (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, NULL, p); |
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return NOTIFY_DONE; |
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} |
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static struct notifier_block br_device_notifier = { |
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.notifier_call = br_device_event |
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}; |
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/* called with RTNL or RCU */ |
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static int br_switchdev_event(struct notifier_block *unused, |
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unsigned long event, void *ptr) |
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{ |
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struct net_device *dev = switchdev_notifier_info_to_dev(ptr); |
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struct net_bridge_port *p; |
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struct net_bridge *br; |
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struct switchdev_notifier_fdb_info *fdb_info; |
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int err = NOTIFY_DONE; |
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p = br_port_get_rtnl_rcu(dev); |
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if (!p) |
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goto out; |
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br = p->br; |
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switch (event) { |
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case SWITCHDEV_FDB_ADD_TO_BRIDGE: |
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fdb_info = ptr; |
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err = br_fdb_external_learn_add(br, p, fdb_info->addr, |
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fdb_info->vid, false); |
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if (err) { |
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err = notifier_from_errno(err); |
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break; |
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} |
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br_fdb_offloaded_set(br, p, fdb_info->addr, |
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fdb_info->vid, true); |
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break; |
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case SWITCHDEV_FDB_DEL_TO_BRIDGE: |
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fdb_info = ptr; |
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err = br_fdb_external_learn_del(br, p, fdb_info->addr, |
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fdb_info->vid, false); |
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if (err) |
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err = notifier_from_errno(err); |
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break; |
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case SWITCHDEV_FDB_OFFLOADED: |
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fdb_info = ptr; |
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br_fdb_offloaded_set(br, p, fdb_info->addr, |
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fdb_info->vid, fdb_info->offloaded); |
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break; |
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case SWITCHDEV_FDB_FLUSH_TO_BRIDGE: |
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fdb_info = ptr; |
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/* Don't delete static entries */ |
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br_fdb_delete_by_port(br, p, fdb_info->vid, 0); |
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break; |
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} |
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out: |
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return err; |
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} |
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static struct notifier_block br_switchdev_notifier = { |
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.notifier_call = br_switchdev_event, |
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}; |
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/* called under rtnl_mutex */ |
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static int br_switchdev_blocking_event(struct notifier_block *nb, |
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unsigned long event, void *ptr) |
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{ |
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struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); |
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struct net_device *dev = switchdev_notifier_info_to_dev(ptr); |
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struct switchdev_notifier_brport_info *brport_info; |
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const struct switchdev_brport *b; |
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struct net_bridge_port *p; |
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int err = NOTIFY_DONE; |
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p = br_port_get_rtnl(dev); |
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if (!p) |
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goto out; |
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switch (event) { |
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case SWITCHDEV_BRPORT_OFFLOADED: |
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brport_info = ptr; |
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b = &brport_info->brport; |
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err = br_switchdev_port_offload(p, b->dev, b->ctx, |
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b->atomic_nb, b->blocking_nb, |
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b->tx_fwd_offload, extack); |
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err = notifier_from_errno(err); |
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break; |
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case SWITCHDEV_BRPORT_UNOFFLOADED: |
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brport_info = ptr; |
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b = &brport_info->brport; |
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br_switchdev_port_unoffload(p, b->ctx, b->atomic_nb, |
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b->blocking_nb); |
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break; |
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} |
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out: |
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return err; |
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} |
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static struct notifier_block br_switchdev_blocking_notifier = { |
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.notifier_call = br_switchdev_blocking_event, |
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}; |
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/* br_boolopt_toggle - change user-controlled boolean option |
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* |
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* @br: bridge device |
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* @opt: id of the option to change |
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* @on: new option value |
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* @extack: extack for error messages |
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* |
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* Changes the value of the respective boolean option to @on taking care of |
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* any internal option value mapping and configuration. |
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*/ |
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int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on, |
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struct netlink_ext_ack *extack) |
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{ |
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int err = 0; |
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switch (opt) { |
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case BR_BOOLOPT_NO_LL_LEARN: |
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br_opt_toggle(br, BROPT_NO_LL_LEARN, on); |
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break; |
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case BR_BOOLOPT_MCAST_VLAN_SNOOPING: |
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err = br_multicast_toggle_vlan_snooping(br, on, extack); |
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break; |
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case BR_BOOLOPT_MST_ENABLE: |
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err = br_mst_set_enabled(br, on, extack); |
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break; |
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default: |
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/* shouldn't be called with unsupported options */ |
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WARN_ON(1); |
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break; |
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} |
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return err; |
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} |
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int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt) |
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{ |
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switch (opt) { |
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case BR_BOOLOPT_NO_LL_LEARN: |
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return br_opt_get(br, BROPT_NO_LL_LEARN); |
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case BR_BOOLOPT_MCAST_VLAN_SNOOPING: |
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return br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED); |
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case BR_BOOLOPT_MST_ENABLE: |
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return br_opt_get(br, BROPT_MST_ENABLED); |
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default: |
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/* shouldn't be called with unsupported options */ |
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WARN_ON(1); |
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break; |
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} |
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return 0; |
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} |
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int br_boolopt_multi_toggle(struct net_bridge *br, |
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struct br_boolopt_multi *bm, |
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struct netlink_ext_ack *extack) |
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{ |
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unsigned long bitmap = bm->optmask; |
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int err = 0; |
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int opt_id; |
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for_each_set_bit(opt_id, &bitmap, BR_BOOLOPT_MAX) { |
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bool on = !!(bm->optval & BIT(opt_id)); |
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err = br_boolopt_toggle(br, opt_id, on, extack); |
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if (err) { |
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br_debug(br, "boolopt multi-toggle error: option: %d current: %d new: %d error: %d\n", |
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opt_id, br_boolopt_get(br, opt_id), on, err); |
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break; |
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} |
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} |
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return err; |
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} |
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void br_boolopt_multi_get(const struct net_bridge *br, |
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struct br_boolopt_multi *bm) |
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{ |
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u32 optval = 0; |
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int opt_id; |
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for (opt_id = 0; opt_id < BR_BOOLOPT_MAX; opt_id++) |
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optval |= (br_boolopt_get(br, opt_id) << opt_id); |
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bm->optval = optval; |
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bm->optmask = GENMASK((BR_BOOLOPT_MAX - 1), 0); |
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} |
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/* private bridge options, controlled by the kernel */ |
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void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on) |
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{ |
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bool cur = !!br_opt_get(br, opt); |
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br_debug(br, "toggle option: %d state: %d -> %d\n", |
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opt, cur, on); |
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if (cur == on) |
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return; |
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if (on) |
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set_bit(opt, &br->options); |
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else |
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clear_bit(opt, &br->options); |
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} |
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static void __net_exit br_net_exit_batch(struct list_head *net_list) |
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{ |
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struct net_device *dev; |
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struct net *net; |
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LIST_HEAD(list); |
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rtnl_lock(); |
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list_for_each_entry(net, net_list, exit_list) |
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for_each_netdev(net, dev) |
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if (netif_is_bridge_master(dev)) |
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br_dev_delete(dev, &list); |
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unregister_netdevice_many(&list); |
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rtnl_unlock(); |
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} |
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static struct pernet_operations br_net_ops = { |
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.exit_batch = br_net_exit_batch, |
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}; |
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static const struct stp_proto br_stp_proto = { |
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.rcv = br_stp_rcv, |
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}; |
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static int __init br_init(void) |
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{ |
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int err; |
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BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > sizeof_field(struct sk_buff, cb)); |
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err = stp_proto_register(&br_stp_proto); |
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if (err < 0) { |
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pr_err("bridge: can't register sap for STP\n"); |
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return err; |
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} |
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err = br_fdb_init(); |
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if (err) |
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goto err_out; |
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err = register_pernet_subsys(&br_net_ops); |
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if (err) |
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goto err_out1; |
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err = br_nf_core_init(); |
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if (err) |
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goto err_out2; |
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err = register_netdevice_notifier(&br_device_notifier); |
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if (err) |
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goto err_out3; |
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err = register_switchdev_notifier(&br_switchdev_notifier); |
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if (err) |
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goto err_out4; |
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err = register_switchdev_blocking_notifier(&br_switchdev_blocking_notifier); |
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if (err) |
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goto err_out5; |
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err = br_netlink_init(); |
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if (err) |
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goto err_out6; |
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brioctl_set(br_ioctl_stub); |
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#if IS_ENABLED(CONFIG_ATM_LANE) |
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br_fdb_test_addr_hook = br_fdb_test_addr; |
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#endif |
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#if IS_MODULE(CONFIG_BRIDGE_NETFILTER) |
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pr_info("bridge: filtering via arp/ip/ip6tables is no longer available " |
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"by default. Update your scripts to load br_netfilter if you " |
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"need this.\n"); |
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#endif |
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return 0; |
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err_out6: |
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unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier); |
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err_out5: |
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unregister_switchdev_notifier(&br_switchdev_notifier); |
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err_out4: |
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unregister_netdevice_notifier(&br_device_notifier); |
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err_out3: |
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br_nf_core_fini(); |
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err_out2: |
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unregister_pernet_subsys(&br_net_ops); |
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err_out1: |
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br_fdb_fini(); |
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err_out: |
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stp_proto_unregister(&br_stp_proto); |
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return err; |
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} |
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static void __exit br_deinit(void) |
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{ |
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stp_proto_unregister(&br_stp_proto); |
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br_netlink_fini(); |
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unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier); |
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unregister_switchdev_notifier(&br_switchdev_notifier); |
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unregister_netdevice_notifier(&br_device_notifier); |
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brioctl_set(NULL); |
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unregister_pernet_subsys(&br_net_ops); |
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rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
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br_nf_core_fini(); |
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#if IS_ENABLED(CONFIG_ATM_LANE) |
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br_fdb_test_addr_hook = NULL; |
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#endif |
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br_fdb_fini(); |
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} |
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module_init(br_init) |
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module_exit(br_deinit) |
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MODULE_LICENSE("GPL"); |
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MODULE_VERSION(BR_VERSION); |
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MODULE_ALIAS_RTNL_LINK("bridge");
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