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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Generic parts
- * Linux ethernet bridge
- *
- * Authors:
- * Lennert Buytenhek <[email protected]>
- */
- #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 (netif_is_bridge_master(dev)) {
- 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 */
- err = br_sysfs_addbr(dev);
- if (err)
- return notifier_from_errno(err);
- 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 underlying 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,
- };
- /* called under rtnl_mutex */
- static int br_switchdev_blocking_event(struct notifier_block *nb,
- unsigned long event, void *ptr)
- {
- struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
- struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
- struct switchdev_notifier_brport_info *brport_info;
- const struct switchdev_brport *b;
- struct net_bridge_port *p;
- int err = NOTIFY_DONE;
- p = br_port_get_rtnl(dev);
- if (!p)
- goto out;
- switch (event) {
- case SWITCHDEV_BRPORT_OFFLOADED:
- brport_info = ptr;
- b = &brport_info->brport;
- err = br_switchdev_port_offload(p, b->dev, b->ctx,
- b->atomic_nb, b->blocking_nb,
- b->tx_fwd_offload, extack);
- err = notifier_from_errno(err);
- break;
- case SWITCHDEV_BRPORT_UNOFFLOADED:
- brport_info = ptr;
- b = &brport_info->brport;
- br_switchdev_port_unoffload(p, b->ctx, b->atomic_nb,
- b->blocking_nb);
- break;
- }
- out:
- return err;
- }
- static struct notifier_block br_switchdev_blocking_notifier = {
- .notifier_call = br_switchdev_blocking_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)
- {
- int err = 0;
- switch (opt) {
- case BR_BOOLOPT_NO_LL_LEARN:
- br_opt_toggle(br, BROPT_NO_LL_LEARN, on);
- break;
- case BR_BOOLOPT_MCAST_VLAN_SNOOPING:
- err = br_multicast_toggle_vlan_snooping(br, on, extack);
- break;
- case BR_BOOLOPT_MST_ENABLE:
- err = br_mst_set_enabled(br, on, extack);
- break;
- default:
- /* shouldn't be called with unsupported options */
- WARN_ON(1);
- break;
- }
- return err;
- }
- 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);
- case BR_BOOLOPT_MCAST_VLAN_SNOOPING:
- return br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED);
- case BR_BOOLOPT_MST_ENABLE:
- return br_opt_get(br, BROPT_MST_ENABLED);
- 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_batch(struct list_head *net_list)
- {
- struct net_device *dev;
- struct net *net;
- LIST_HEAD(list);
- rtnl_lock();
- list_for_each_entry(net, net_list, exit_list)
- for_each_netdev(net, dev)
- if (netif_is_bridge_master(dev))
- br_dev_delete(dev, &list);
- unregister_netdevice_many(&list);
- rtnl_unlock();
- }
- static struct pernet_operations br_net_ops = {
- .exit_batch = br_net_exit_batch,
- };
- 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 = register_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
- if (err)
- goto err_out5;
- err = br_netlink_init();
- if (err)
- goto err_out6;
- brioctl_set(br_ioctl_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_out6:
- unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
- 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_blocking_notifier(&br_switchdev_blocking_notifier);
- 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");
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