34666d467c
Jesper reported that br_netfilter always registers the hooks since this is part of the bridge core. This harms performance for people that don't need this. This patch modularizes br_netfilter so it can be rmmod'ed, thus, the hooks can be unregistered. I think the bridge netfilter should have been a separated module since the beginning, Patrick agreed on that. Note that this is breaking compatibility for users that expect that bridge netfilter is going to be available after explicitly 'modprobe bridge' or via automatic load through brctl. However, the damage can be easily undone by modprobing br_netfilter. The bridge core also spots a message to provide a clue to people that didn't notice that this has been deprecated. On top of that, the plan is that nftables will not rely on this software layer, but integrate the connection tracking into the bridge layer to enable stateful filtering and NAT, which is was bridge netfilter users seem to require. This patch still keeps the fake_dst_ops in the bridge core, since this is required by when the bridge port is initialized. So we can safely modprobe/rmmod br_netfilter anytime. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Acked-by: Florian Westphal <fw@strlen.de>
222 lines
4.6 KiB
C
222 lines
4.6 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 "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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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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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 = br_netlink_init();
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if (err)
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goto err_out4;
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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_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_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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