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