11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Generic parts 31da177e4SLinus Torvalds * Linux ethernet bridge 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Authors: 61da177e4SLinus Torvalds * Lennert Buytenhek <buytenh@gnu.org> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 91da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 101da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 111da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 121da177e4SLinus Torvalds */ 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds #include <linux/module.h> 151da177e4SLinus Torvalds #include <linux/kernel.h> 161da177e4SLinus Torvalds #include <linux/netdevice.h> 171da177e4SLinus Torvalds #include <linux/etherdevice.h> 181da177e4SLinus Torvalds #include <linux/init.h> 19cf0f02d0SStephen Hemminger #include <linux/llc.h> 20cf0f02d0SStephen Hemminger #include <net/llc.h> 217c85fbf0SPatrick McHardy #include <net/stp.h> 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds #include "br_private.h" 241da177e4SLinus Torvalds 25b1282726SCong Wang /* 26b1282726SCong Wang * Handle changes in state of network devices enslaved to a bridge. 27b1282726SCong Wang * 28b1282726SCong Wang * Note: don't care about up/down if bridge itself is down, because 29b1282726SCong Wang * port state is checked when bridge is brought up. 30b1282726SCong Wang */ 31b1282726SCong Wang static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr) 32b1282726SCong Wang { 33b1282726SCong Wang struct net_device *dev = netdev_notifier_info_to_dev(ptr); 34b1282726SCong Wang struct net_bridge_port *p; 35b1282726SCong Wang struct net_bridge *br; 36b1282726SCong Wang bool changed_addr; 37b1282726SCong Wang int err; 38b1282726SCong Wang 39b1282726SCong Wang /* register of bridge completed, add sysfs entries */ 40b1282726SCong Wang if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) { 41b1282726SCong Wang br_sysfs_addbr(dev); 42b1282726SCong Wang return NOTIFY_DONE; 43b1282726SCong Wang } 44b1282726SCong Wang 45b1282726SCong Wang /* not a port of a bridge */ 46b1282726SCong Wang p = br_port_get_rtnl(dev); 47b1282726SCong Wang if (!p) 48b1282726SCong Wang return NOTIFY_DONE; 49b1282726SCong Wang 50b1282726SCong Wang br = p->br; 51b1282726SCong Wang 52b1282726SCong Wang switch (event) { 53b1282726SCong Wang case NETDEV_CHANGEMTU: 54b1282726SCong Wang dev_set_mtu(br->dev, br_min_mtu(br)); 55b1282726SCong Wang break; 56b1282726SCong Wang 57b1282726SCong Wang case NETDEV_CHANGEADDR: 58b1282726SCong Wang spin_lock_bh(&br->lock); 59b1282726SCong Wang br_fdb_changeaddr(p, dev->dev_addr); 60b1282726SCong Wang changed_addr = br_stp_recalculate_bridge_id(br); 61b1282726SCong Wang spin_unlock_bh(&br->lock); 62b1282726SCong Wang 63b1282726SCong Wang if (changed_addr) 64b1282726SCong Wang call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); 65b1282726SCong Wang 66b1282726SCong Wang break; 67b1282726SCong Wang 68b1282726SCong Wang case NETDEV_CHANGE: 69b1282726SCong Wang br_port_carrier_check(p); 70b1282726SCong Wang break; 71b1282726SCong Wang 72b1282726SCong Wang case NETDEV_FEAT_CHANGE: 73b1282726SCong Wang netdev_update_features(br->dev); 74b1282726SCong Wang break; 75b1282726SCong Wang 76b1282726SCong Wang case NETDEV_DOWN: 77b1282726SCong Wang spin_lock_bh(&br->lock); 78b1282726SCong Wang if (br->dev->flags & IFF_UP) 79b1282726SCong Wang br_stp_disable_port(p); 80b1282726SCong Wang spin_unlock_bh(&br->lock); 81b1282726SCong Wang break; 82b1282726SCong Wang 83b1282726SCong Wang case NETDEV_UP: 84b1282726SCong Wang if (netif_running(br->dev) && netif_oper_up(dev)) { 85b1282726SCong Wang spin_lock_bh(&br->lock); 86b1282726SCong Wang br_stp_enable_port(p); 87b1282726SCong Wang spin_unlock_bh(&br->lock); 88b1282726SCong Wang } 89b1282726SCong Wang break; 90b1282726SCong Wang 91b1282726SCong Wang case NETDEV_UNREGISTER: 92b1282726SCong Wang br_del_if(br, dev); 93b1282726SCong Wang break; 94b1282726SCong Wang 95b1282726SCong Wang case NETDEV_CHANGENAME: 96b1282726SCong Wang err = br_sysfs_renameif(p); 97b1282726SCong Wang if (err) 98b1282726SCong Wang return notifier_from_errno(err); 99b1282726SCong Wang break; 100b1282726SCong Wang 101b1282726SCong Wang case NETDEV_PRE_TYPE_CHANGE: 102b1282726SCong Wang /* Forbid underlaying device to change its type. */ 103b1282726SCong Wang return NOTIFY_BAD; 104b1282726SCong Wang 105b1282726SCong Wang case NETDEV_RESEND_IGMP: 106b1282726SCong Wang /* Propagate to master device */ 107b1282726SCong Wang call_netdevice_notifiers(event, br->dev); 108b1282726SCong Wang break; 109b1282726SCong Wang } 110b1282726SCong Wang 111b1282726SCong Wang /* Events that may cause spanning tree to refresh */ 112b1282726SCong Wang if (event == NETDEV_CHANGEADDR || event == NETDEV_UP || 113b1282726SCong Wang event == NETDEV_CHANGE || event == NETDEV_DOWN) 114b1282726SCong Wang br_ifinfo_notify(RTM_NEWLINK, p); 115b1282726SCong Wang 116b1282726SCong Wang return NOTIFY_DONE; 117b1282726SCong Wang } 118b1282726SCong Wang 119b1282726SCong Wang static struct notifier_block br_device_notifier = { 120b1282726SCong Wang .notifier_call = br_device_event 121b1282726SCong Wang }; 122b1282726SCong Wang 123b86f81ccSWANG Cong static void __net_exit br_net_exit(struct net *net) 124b86f81ccSWANG Cong { 125b86f81ccSWANG Cong struct net_device *dev; 126b86f81ccSWANG Cong LIST_HEAD(list); 127b86f81ccSWANG Cong 128b86f81ccSWANG Cong rtnl_lock(); 129b86f81ccSWANG Cong for_each_netdev(net, dev) 130b86f81ccSWANG Cong if (dev->priv_flags & IFF_EBRIDGE) 131b86f81ccSWANG Cong br_dev_delete(dev, &list); 132b86f81ccSWANG Cong 133b86f81ccSWANG Cong unregister_netdevice_many(&list); 134b86f81ccSWANG Cong rtnl_unlock(); 135b86f81ccSWANG Cong 136b86f81ccSWANG Cong } 137cf0f02d0SStephen Hemminger 138712d6954SAlexey Dobriyan static struct pernet_operations br_net_ops = { 139712d6954SAlexey Dobriyan .exit = br_net_exit, 140712d6954SAlexey Dobriyan }; 141712d6954SAlexey Dobriyan 142b86f81ccSWANG Cong static const struct stp_proto br_stp_proto = { 143b86f81ccSWANG Cong .rcv = br_stp_rcv, 144b86f81ccSWANG Cong }; 145b86f81ccSWANG Cong 1461da177e4SLinus Torvalds static int __init br_init(void) 1471da177e4SLinus Torvalds { 148c0909713SStephen Hemminger int err; 149c0909713SStephen Hemminger 1507c85fbf0SPatrick McHardy err = stp_proto_register(&br_stp_proto); 1517c85fbf0SPatrick McHardy if (err < 0) { 15228a16c97Sstephen hemminger pr_err("bridge: can't register sap for STP\n"); 1537c85fbf0SPatrick McHardy return err; 154cf0f02d0SStephen Hemminger } 155cf0f02d0SStephen Hemminger 15687a596e0SAkinobu Mita err = br_fdb_init(); 15787a596e0SAkinobu Mita if (err) 15817efdd45SPavel Emelyanov goto err_out; 1591da177e4SLinus Torvalds 160712d6954SAlexey Dobriyan err = register_pernet_subsys(&br_net_ops); 161c0909713SStephen Hemminger if (err) 162c0909713SStephen Hemminger goto err_out1; 163c0909713SStephen Hemminger 164712d6954SAlexey Dobriyan err = br_netfilter_init(); 165c0909713SStephen Hemminger if (err) 166c0909713SStephen Hemminger goto err_out2; 167c0909713SStephen Hemminger 168712d6954SAlexey Dobriyan err = register_netdevice_notifier(&br_device_notifier); 16932fe21c0SThomas Graf if (err) 17032fe21c0SThomas Graf goto err_out3; 17132fe21c0SThomas Graf 172712d6954SAlexey Dobriyan err = br_netlink_init(); 173712d6954SAlexey Dobriyan if (err) 174712d6954SAlexey Dobriyan goto err_out4; 175712d6954SAlexey Dobriyan 1761da177e4SLinus Torvalds brioctl_set(br_ioctl_deviceless_stub); 1771da177e4SLinus Torvalds 178e6373c4cSIgor Maravić #if IS_ENABLED(CONFIG_ATM_LANE) 179da678292SMichał Mirosław br_fdb_test_addr_hook = br_fdb_test_addr; 180da678292SMichał Mirosław #endif 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds return 0; 183712d6954SAlexey Dobriyan err_out4: 18432fe21c0SThomas Graf unregister_netdevice_notifier(&br_device_notifier); 185712d6954SAlexey Dobriyan err_out3: 186c0909713SStephen Hemminger br_netfilter_fini(); 187712d6954SAlexey Dobriyan err_out2: 188712d6954SAlexey Dobriyan unregister_pernet_subsys(&br_net_ops); 189c0909713SStephen Hemminger err_out1: 19017efdd45SPavel Emelyanov br_fdb_fini(); 19117efdd45SPavel Emelyanov err_out: 1927c85fbf0SPatrick McHardy stp_proto_unregister(&br_stp_proto); 193c0909713SStephen Hemminger return err; 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds static void __exit br_deinit(void) 1971da177e4SLinus Torvalds { 1987c85fbf0SPatrick McHardy stp_proto_unregister(&br_stp_proto); 199cf0f02d0SStephen Hemminger 20011dc1f36SStephen Hemminger br_netlink_fini(); 2011da177e4SLinus Torvalds unregister_netdevice_notifier(&br_device_notifier); 2021da177e4SLinus Torvalds brioctl_set(NULL); 2031da177e4SLinus Torvalds 204712d6954SAlexey Dobriyan unregister_pernet_subsys(&br_net_ops); 2051da177e4SLinus Torvalds 206473c22d7SJesper Dangaard Brouer rcu_barrier(); /* Wait for completion of call_rcu()'s */ 2071da177e4SLinus Torvalds 208d69efb16SBodo Stroesser br_netfilter_fini(); 209e6373c4cSIgor Maravić #if IS_ENABLED(CONFIG_ATM_LANE) 210da678292SMichał Mirosław br_fdb_test_addr_hook = NULL; 211da678292SMichał Mirosław #endif 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds br_fdb_fini(); 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds module_init(br_init) 2171da177e4SLinus Torvalds module_exit(br_deinit) 2181da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 2198cbb512eSStephen Hemminger MODULE_VERSION(BR_VERSION); 220bb900b27Sstephen hemminger MODULE_ALIAS_RTNL_LINK("bridge"); 221