11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Spanning tree protocol; interface code 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/kernel.h> 1579bb1ee4SPaul Gortmaker #include <linux/kmod.h> 166ede2463SStephen Hemminger #include <linux/etherdevice.h> 1711dc1f36SStephen Hemminger #include <linux/rtnetlink.h> 186ac311aeSElad Raz #include <net/switchdev.h> 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #include "br_private.h" 211da177e4SLinus Torvalds #include "br_private_stp.h" 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds /* Port id is composed of priority and port number. 2514f98f25Sstephen hemminger * NB: some bits of priority are dropped to 261da177e4SLinus Torvalds * make room for more ports. 271da177e4SLinus Torvalds */ 281da177e4SLinus Torvalds static inline port_id br_make_port_id(__u8 priority, __u16 port_no) 291da177e4SLinus Torvalds { 301da177e4SLinus Torvalds return ((u16)priority << BR_PORT_BITS) 311da177e4SLinus Torvalds | (port_no & ((1<<BR_PORT_BITS)-1)); 321da177e4SLinus Torvalds } 331da177e4SLinus Torvalds 3414f98f25Sstephen hemminger #define BR_MAX_PORT_PRIORITY ((u16)~0 >> BR_PORT_BITS) 3514f98f25Sstephen hemminger 361da177e4SLinus Torvalds /* called under bridge lock */ 371da177e4SLinus Torvalds void br_init_port(struct net_bridge_port *p) 381da177e4SLinus Torvalds { 396ac311aeSElad Raz int err; 406ac311aeSElad Raz 411da177e4SLinus Torvalds p->port_id = br_make_port_id(p->priority, p->port_no); 421da177e4SLinus Torvalds br_become_designated_port(p); 43775dd692SFlorian Fainelli br_set_state(p, BR_STATE_BLOCKING); 441da177e4SLinus Torvalds p->topology_change_ack = 0; 451da177e4SLinus Torvalds p->config_pending = 0; 466ac311aeSElad Raz 4782dd4332SVivien Didelot err = __set_ageing_time(p->dev, p->br->ageing_time); 4882dd4332SVivien Didelot if (err) 4982dd4332SVivien Didelot netdev_err(p->dev, "failed to offload ageing time\n"); 501da177e4SLinus Torvalds } 511da177e4SLinus Torvalds 52dba479f3SVivien Didelot /* NO locks held */ 531da177e4SLinus Torvalds void br_stp_enable_bridge(struct net_bridge *br) 541da177e4SLinus Torvalds { 551da177e4SLinus Torvalds struct net_bridge_port *p; 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds spin_lock_bh(&br->lock); 5876b91c32SNikolay Aleksandrov if (br->stp_enabled == BR_KERNEL_STP) 591da177e4SLinus Torvalds mod_timer(&br->hello_timer, jiffies + br->hello_time); 60f7cdee8aSNikolay Aleksandrov mod_delayed_work(system_long_wq, &br->gc_work, HZ / 10); 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds br_config_bpdu_generation(br); 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds list_for_each_entry(p, &br->port_list, list) { 65576eb625Sstephen hemminger if (netif_running(p->dev) && netif_oper_up(p->dev)) 661da177e4SLinus Torvalds br_stp_enable_port(p); 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds } 691da177e4SLinus Torvalds spin_unlock_bh(&br->lock); 701da177e4SLinus Torvalds } 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds /* NO locks held */ 731da177e4SLinus Torvalds void br_stp_disable_bridge(struct net_bridge *br) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds struct net_bridge_port *p; 761da177e4SLinus Torvalds 7778872ccbSAdrian Drzewiecki spin_lock_bh(&br->lock); 781da177e4SLinus Torvalds list_for_each_entry(p, &br->port_list, list) { 791da177e4SLinus Torvalds if (p->state != BR_STATE_DISABLED) 801da177e4SLinus Torvalds br_stp_disable_port(p); 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds } 831da177e4SLinus Torvalds 848384b5f5SVivien Didelot __br_set_topology_change(br, 0); 851da177e4SLinus Torvalds br->topology_change_detected = 0; 8678872ccbSAdrian Drzewiecki spin_unlock_bh(&br->lock); 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds del_timer_sync(&br->hello_timer); 891da177e4SLinus Torvalds del_timer_sync(&br->topology_change_timer); 901da177e4SLinus Torvalds del_timer_sync(&br->tcn_timer); 91f7cdee8aSNikolay Aleksandrov cancel_delayed_work_sync(&br->gc_work); 921da177e4SLinus Torvalds } 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds /* called under bridge lock */ 951da177e4SLinus Torvalds void br_stp_enable_port(struct net_bridge_port *p) 961da177e4SLinus Torvalds { 971da177e4SLinus Torvalds br_init_port(p); 981da177e4SLinus Torvalds br_port_state_selection(p->br); 9992899063SNikolay Aleksandrov br_ifinfo_notify(RTM_NEWLINK, NULL, p); 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds /* called under bridge lock */ 1031da177e4SLinus Torvalds void br_stp_disable_port(struct net_bridge_port *p) 1041da177e4SLinus Torvalds { 10528a16c97Sstephen hemminger struct net_bridge *br = p->br; 1061da177e4SLinus Torvalds int wasroot; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds wasroot = br_is_root_bridge(br); 1091da177e4SLinus Torvalds br_become_designated_port(p); 110775dd692SFlorian Fainelli br_set_state(p, BR_STATE_DISABLED); 1111da177e4SLinus Torvalds p->topology_change_ack = 0; 1121da177e4SLinus Torvalds p->config_pending = 0; 1131da177e4SLinus Torvalds 11492899063SNikolay Aleksandrov br_ifinfo_notify(RTM_NEWLINK, NULL, p); 1154ecb961cSstephen hemminger 1161da177e4SLinus Torvalds del_timer(&p->message_age_timer); 1171da177e4SLinus Torvalds del_timer(&p->forward_delay_timer); 1181da177e4SLinus Torvalds del_timer(&p->hold_timer); 1191da177e4SLinus Torvalds 1208dc35020SNikolay Aleksandrov if (!rcu_access_pointer(p->backup_port)) 1211ea2d020SNikolay Aleksandrov br_fdb_delete_by_port(br, p, 0, 0); 1223fe2d7c7SHerbert Xu br_multicast_disable_port(p); 1231a620698SStephen Hemminger 1241da177e4SLinus Torvalds br_configuration_update(br); 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds br_port_state_selection(br); 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds if (br_is_root_bridge(br) && !wasroot) 1291da177e4SLinus Torvalds br_become_root_bridge(br); 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds 13230843315SVivien Didelot static int br_stp_call_user(struct net_bridge *br, char *arg) 13330843315SVivien Didelot { 13430843315SVivien Didelot char *argv[] = { BR_STP_PROG, br->dev->name, arg, NULL }; 13530843315SVivien Didelot char *envp[] = { NULL }; 13630843315SVivien Didelot int rc; 13730843315SVivien Didelot 13830843315SVivien Didelot /* call userspace STP and report program errors */ 13930843315SVivien Didelot rc = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); 14030843315SVivien Didelot if (rc > 0) { 14130843315SVivien Didelot if (rc & 0xff) 14230843315SVivien Didelot br_debug(br, BR_STP_PROG " received signal %d\n", 14330843315SVivien Didelot rc & 0x7f); 14430843315SVivien Didelot else 14530843315SVivien Didelot br_debug(br, BR_STP_PROG " exited with code %d\n", 14630843315SVivien Didelot (rc >> 8) & 0xff); 14730843315SVivien Didelot } 14830843315SVivien Didelot 14930843315SVivien Didelot return rc; 15030843315SVivien Didelot } 15130843315SVivien Didelot 1529cde0708SStephen Hemminger static void br_stp_start(struct net_bridge *br) 1539cde0708SStephen Hemminger { 15430843315SVivien Didelot int err = -ENOENT; 1559cde0708SStephen Hemminger 156ff621985SHannes Frederic Sowa if (net_eq(dev_net(br->dev), &init_net)) 15730843315SVivien Didelot err = br_stp_call_user(br, "start"); 15830843315SVivien Didelot 15930843315SVivien Didelot if (err && err != -ENOENT) 16030843315SVivien Didelot br_err(br, "failed to start userspace STP (%d)\n", err); 161be4f154dSHerbert Xu 162be4f154dSHerbert Xu spin_lock_bh(&br->lock); 163be4f154dSHerbert Xu 164be4f154dSHerbert Xu if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY) 165be4f154dSHerbert Xu __br_set_forward_delay(br, BR_MIN_FORWARD_DELAY); 1664b6c7879SVlad Yasevich else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY) 167be4f154dSHerbert Xu __br_set_forward_delay(br, BR_MAX_FORWARD_DELAY); 168be4f154dSHerbert Xu 16930843315SVivien Didelot if (!err) { 1709cde0708SStephen Hemminger br->stp_enabled = BR_USER_STP; 17128a16c97Sstephen hemminger br_debug(br, "userspace STP started\n"); 1729cde0708SStephen Hemminger } else { 1739cde0708SStephen Hemminger br->stp_enabled = BR_KERNEL_STP; 17428a16c97Sstephen hemminger br_debug(br, "using kernel STP\n"); 1759cde0708SStephen Hemminger 1769cde0708SStephen Hemminger /* To start timers on any ports left in blocking */ 177aeb07324SNikolay Aleksandrov if (br->dev->flags & IFF_UP) 1786d18c732SXin Long mod_timer(&br->hello_timer, jiffies + br->hello_time); 1799cde0708SStephen Hemminger br_port_state_selection(br); 1809cde0708SStephen Hemminger } 181be4f154dSHerbert Xu 182be4f154dSHerbert Xu spin_unlock_bh(&br->lock); 1839cde0708SStephen Hemminger } 1849cde0708SStephen Hemminger 1859cde0708SStephen Hemminger static void br_stp_stop(struct net_bridge *br) 1869cde0708SStephen Hemminger { 18730843315SVivien Didelot int err; 1889cde0708SStephen Hemminger 1899cde0708SStephen Hemminger if (br->stp_enabled == BR_USER_STP) { 19030843315SVivien Didelot err = br_stp_call_user(br, "stop"); 19130843315SVivien Didelot if (err) 19230843315SVivien Didelot br_err(br, "failed to stop userspace STP (%d)\n", err); 1939cde0708SStephen Hemminger 1949cde0708SStephen Hemminger /* To start timers on any ports left in blocking */ 1959cde0708SStephen Hemminger spin_lock_bh(&br->lock); 1969cde0708SStephen Hemminger br_port_state_selection(br); 1979cde0708SStephen Hemminger spin_unlock_bh(&br->lock); 1989cde0708SStephen Hemminger } 1999cde0708SStephen Hemminger 2009cde0708SStephen Hemminger br->stp_enabled = BR_NO_STP; 2019cde0708SStephen Hemminger } 2029cde0708SStephen Hemminger 2039cde0708SStephen Hemminger void br_stp_set_enabled(struct net_bridge *br, unsigned long val) 2049cde0708SStephen Hemminger { 2059cde0708SStephen Hemminger ASSERT_RTNL(); 2069cde0708SStephen Hemminger 2079cde0708SStephen Hemminger if (val) { 2089cde0708SStephen Hemminger if (br->stp_enabled == BR_NO_STP) 2099cde0708SStephen Hemminger br_stp_start(br); 2109cde0708SStephen Hemminger } else { 2119cde0708SStephen Hemminger if (br->stp_enabled != BR_NO_STP) 2129cde0708SStephen Hemminger br_stp_stop(br); 2139cde0708SStephen Hemminger } 2149cde0708SStephen Hemminger } 2159cde0708SStephen Hemminger 2161da177e4SLinus Torvalds /* called under bridge lock */ 2174505a3efSStephen Hemminger void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) 2181da177e4SLinus Torvalds { 2199a7b6ef9SJoe Perches /* should be aligned on 2 bytes for ether_addr_equal() */ 22019bb3506SEvgeny Kravtsunov unsigned short oldaddr_aligned[ETH_ALEN >> 1]; 22119bb3506SEvgeny Kravtsunov unsigned char *oldaddr = (unsigned char *)oldaddr_aligned; 2221da177e4SLinus Torvalds struct net_bridge_port *p; 2231da177e4SLinus Torvalds int wasroot; 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds wasroot = br_is_root_bridge(br); 2261da177e4SLinus Torvalds 227a4b816d8SToshiaki Makita br_fdb_change_mac_address(br, addr); 228a4b816d8SToshiaki Makita 2291da177e4SLinus Torvalds memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); 2301da177e4SLinus Torvalds memcpy(br->bridge_id.addr, addr, ETH_ALEN); 2311da177e4SLinus Torvalds memcpy(br->dev->dev_addr, addr, ETH_ALEN); 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds list_for_each_entry(p, &br->port_list, list) { 2349a7b6ef9SJoe Perches if (ether_addr_equal(p->designated_bridge.addr, oldaddr)) 2351da177e4SLinus Torvalds memcpy(p->designated_bridge.addr, addr, ETH_ALEN); 2361da177e4SLinus Torvalds 2379a7b6ef9SJoe Perches if (ether_addr_equal(p->designated_root.addr, oldaddr)) 2381da177e4SLinus Torvalds memcpy(p->designated_root.addr, addr, ETH_ALEN); 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds br_configuration_update(br); 2421da177e4SLinus Torvalds br_port_state_selection(br); 2431da177e4SLinus Torvalds if (br_is_root_bridge(br) && !wasroot) 2441da177e4SLinus Torvalds br_become_root_bridge(br); 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds 2479a7b6ef9SJoe Perches /* should be aligned on 2 bytes for ether_addr_equal() */ 24819bb3506SEvgeny Kravtsunov static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1]; 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds /* called under bridge lock */ 251edf947f1Sstephen hemminger bool br_stp_recalculate_bridge_id(struct net_bridge *br) 2521da177e4SLinus Torvalds { 25319bb3506SEvgeny Kravtsunov const unsigned char *br_mac_zero = 25419bb3506SEvgeny Kravtsunov (const unsigned char *)br_mac_zero_aligned; 2551da177e4SLinus Torvalds const unsigned char *addr = br_mac_zero; 2561da177e4SLinus Torvalds struct net_bridge_port *p; 2571da177e4SLinus Torvalds 25892c0574fSStephen Hemminger /* user has chosen a value so keep it */ 259b2748267SJiri Pirko if (br->dev->addr_assign_type == NET_ADDR_SET) 2601459a3ccSBalaji G return false; 26192c0574fSStephen Hemminger 2621da177e4SLinus Torvalds list_for_each_entry(p, &br->port_list, list) { 2631da177e4SLinus Torvalds if (addr == br_mac_zero || 264554c9a8eSStephen Hemminger memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) 2651da177e4SLinus Torvalds addr = p->dev->dev_addr; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2699a7b6ef9SJoe Perches if (ether_addr_equal(br->bridge_id.addr, addr)) 270edf947f1Sstephen hemminger return false; /* no change */ 271edf947f1Sstephen hemminger 2721da177e4SLinus Torvalds br_stp_change_bridge_id(br, addr); 273edf947f1Sstephen hemminger return true; 2741da177e4SLinus Torvalds } 2751da177e4SLinus Torvalds 2762dab80a8SNikolay Aleksandrov /* Acquires and releases bridge lock */ 2771da177e4SLinus Torvalds void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) 2781da177e4SLinus Torvalds { 2791da177e4SLinus Torvalds struct net_bridge_port *p; 2801da177e4SLinus Torvalds int wasroot; 2811da177e4SLinus Torvalds 2822dab80a8SNikolay Aleksandrov spin_lock_bh(&br->lock); 2831da177e4SLinus Torvalds wasroot = br_is_root_bridge(br); 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds list_for_each_entry(p, &br->port_list, list) { 2861da177e4SLinus Torvalds if (p->state != BR_STATE_DISABLED && 2871da177e4SLinus Torvalds br_is_designated_port(p)) { 2881da177e4SLinus Torvalds p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; 2891da177e4SLinus Torvalds p->designated_bridge.prio[1] = newprio & 0xFF; 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; 2951da177e4SLinus Torvalds br->bridge_id.prio[1] = newprio & 0xFF; 2961da177e4SLinus Torvalds br_configuration_update(br); 2971da177e4SLinus Torvalds br_port_state_selection(br); 2981da177e4SLinus Torvalds if (br_is_root_bridge(br) && !wasroot) 2991da177e4SLinus Torvalds br_become_root_bridge(br); 3002dab80a8SNikolay Aleksandrov spin_unlock_bh(&br->lock); 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds /* called under bridge lock */ 30414f98f25Sstephen hemminger int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio) 3051da177e4SLinus Torvalds { 30614f98f25Sstephen hemminger port_id new_port_id; 3071da177e4SLinus Torvalds 30814f98f25Sstephen hemminger if (newprio > BR_MAX_PORT_PRIORITY) 30914f98f25Sstephen hemminger return -ERANGE; 31014f98f25Sstephen hemminger 31114f98f25Sstephen hemminger new_port_id = br_make_port_id(newprio, p->port_no); 3121da177e4SLinus Torvalds if (br_is_designated_port(p)) 3131da177e4SLinus Torvalds p->designated_port = new_port_id; 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds p->port_id = new_port_id; 3161da177e4SLinus Torvalds p->priority = newprio; 3171da177e4SLinus Torvalds if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && 3181da177e4SLinus Torvalds p->port_id < p->designated_port) { 3191da177e4SLinus Torvalds br_become_designated_port(p); 3201da177e4SLinus Torvalds br_port_state_selection(p->br); 3211da177e4SLinus Torvalds } 32214f98f25Sstephen hemminger 32314f98f25Sstephen hemminger return 0; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds /* called under bridge lock */ 32714f98f25Sstephen hemminger int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost) 3281da177e4SLinus Torvalds { 32914f98f25Sstephen hemminger if (path_cost < BR_MIN_PATH_COST || 33014f98f25Sstephen hemminger path_cost > BR_MAX_PATH_COST) 33114f98f25Sstephen hemminger return -ERANGE; 33214f98f25Sstephen hemminger 3338f3359bdSstephen hemminger p->flags |= BR_ADMIN_COST; 3341da177e4SLinus Torvalds p->path_cost = path_cost; 3351da177e4SLinus Torvalds br_configuration_update(p->br); 3361da177e4SLinus Torvalds br_port_state_selection(p->br); 33714f98f25Sstephen hemminger return 0; 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) 3411da177e4SLinus Torvalds { 3421da177e4SLinus Torvalds return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", 3431da177e4SLinus Torvalds id->prio[0], id->prio[1], 3441da177e4SLinus Torvalds id->addr[0], id->addr[1], id->addr[2], 3451da177e4SLinus Torvalds id->addr[3], id->addr[4], id->addr[5]); 3461da177e4SLinus Torvalds } 347