diff options
Diffstat (limited to 'net/bridge/br.c')
| -rw-r--r-- | net/bridge/br.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/net/bridge/br.c b/net/bridge/br.c new file mode 100644 index 000000000..02c24cf63 --- /dev/null +++ b/net/bridge/br.c @@ -0,0 +1,274 @@ +/* + * Generic parts + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek <buytenh@gnu.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#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 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; +} + +static struct notifier_block br_device_notifier = { + .notifier_call = br_device_event +}; + +static int br_netdev_switch_event(struct notifier_block *unused, + unsigned long event, void *ptr) +{ + struct net_device *dev = netdev_switch_notifier_info_to_dev(ptr); + struct net_bridge_port *p; + struct net_bridge *br; + struct netdev_switch_notifier_fdb_info *fdb_info; + int err = NOTIFY_DONE; + + rtnl_lock(); + p = br_port_get_rtnl(dev); + if (!p) + goto out; + + br = p->br; + + switch (event) { + case NETDEV_SWITCH_FDB_ADD: + fdb_info = ptr; + err = br_fdb_external_learn_add(br, p, fdb_info->addr, + fdb_info->vid); + if (err) + err = notifier_from_errno(err); + break; + case NETDEV_SWITCH_FDB_DEL: + fdb_info = ptr; + err = br_fdb_external_learn_del(br, p, fdb_info->addr, + fdb_info->vid); + if (err) + err = notifier_from_errno(err); + break; + } + +out: + rtnl_unlock(); + return err; +} + +static struct notifier_block br_netdev_switch_notifier = { + .notifier_call = br_netdev_switch_event, +}; + +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) > FIELD_SIZEOF(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_netdev_switch_notifier(&br_netdev_switch_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 + + pr_info("bridge: automatic filtering via arp/ip/ip6tables has been " + "deprecated. Update your scripts to load br_netfilter if you " + "need this.\n"); + + return 0; + +err_out5: + unregister_netdev_switch_notifier(&br_netdev_switch_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_netdev_switch_notifier(&br_netdev_switch_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"); |