| /* |
| * 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 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) { |
| if (event == NETDEV_REGISTER) { |
| /* register of bridge completed, add sysfs entries */ |
| br_sysfs_addbr(dev); |
| return NOTIFY_DONE; |
| } |
| br_vlan_bridge_event(dev, event, ptr); |
| } |
| |
| /* 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; |
| } |
| |
| 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) > 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_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"); |