mirror of https://gitee.com/openkylin/linux.git
274 lines
5.8 KiB
C
274 lines
5.8 KiB
C
/*
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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 <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/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 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 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_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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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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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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/* 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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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 */
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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(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:
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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);
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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_DEL:
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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);
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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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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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static void __net_exit br_net_exit(struct net *net)
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{
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struct net_device *dev;
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LIST_HEAD(list);
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rtnl_lock();
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for_each_netdev(net, dev)
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if (dev->priv_flags & IFF_EBRIDGE)
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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 = br_net_exit,
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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) > FIELD_SIZEOF(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 = br_netlink_init();
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if (err)
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goto err_out5;
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brioctl_set(br_ioctl_deviceless_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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pr_info("bridge: automatic filtering via arp/ip/ip6tables has been "
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"deprecated. Update your scripts to load br_netfilter if you "
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"need this.\n");
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return 0;
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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_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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