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 struct switchdev_attr attr = { 406ac311aeSElad Raz .id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME, 416ac311aeSElad Raz .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP | SWITCHDEV_F_DEFER, 42ef9cdd0fSIdo Schimmel .u.ageing_time = jiffies_to_clock_t(p->br->ageing_time), 436ac311aeSElad Raz }; 446ac311aeSElad Raz int err; 456ac311aeSElad Raz 461da177e4SLinus Torvalds p->port_id = br_make_port_id(p->priority, p->port_no); 471da177e4SLinus Torvalds br_become_designated_port(p); 48775dd692SFlorian Fainelli br_set_state(p, BR_STATE_BLOCKING); 491da177e4SLinus Torvalds p->topology_change_ack = 0; 501da177e4SLinus Torvalds p->config_pending = 0; 516ac311aeSElad Raz 526ac311aeSElad Raz err = switchdev_port_attr_set(p->dev, &attr); 53bbe14f54SIdo Schimmel if (err && err != -EOPNOTSUPP) 546ac311aeSElad Raz netdev_err(p->dev, "failed to set HW ageing time\n"); 551da177e4SLinus Torvalds } 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds /* called under bridge lock */ 581da177e4SLinus Torvalds void br_stp_enable_bridge(struct net_bridge *br) 591da177e4SLinus Torvalds { 601da177e4SLinus Torvalds struct net_bridge_port *p; 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds spin_lock_bh(&br->lock); 6376b91c32SNikolay Aleksandrov if (br->stp_enabled == BR_KERNEL_STP) 641da177e4SLinus Torvalds mod_timer(&br->hello_timer, jiffies + br->hello_time); 651da177e4SLinus Torvalds mod_timer(&br->gc_timer, jiffies + HZ/10); 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds br_config_bpdu_generation(br); 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds list_for_each_entry(p, &br->port_list, list) { 70576eb625Sstephen hemminger if (netif_running(p->dev) && netif_oper_up(p->dev)) 711da177e4SLinus Torvalds br_stp_enable_port(p); 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds } 741da177e4SLinus Torvalds spin_unlock_bh(&br->lock); 751da177e4SLinus Torvalds } 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds /* NO locks held */ 781da177e4SLinus Torvalds void br_stp_disable_bridge(struct net_bridge *br) 791da177e4SLinus Torvalds { 801da177e4SLinus Torvalds struct net_bridge_port *p; 811da177e4SLinus Torvalds 8278872ccbSAdrian Drzewiecki spin_lock_bh(&br->lock); 831da177e4SLinus Torvalds list_for_each_entry(p, &br->port_list, list) { 841da177e4SLinus Torvalds if (p->state != BR_STATE_DISABLED) 851da177e4SLinus Torvalds br_stp_disable_port(p); 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds br->topology_change = 0; 901da177e4SLinus Torvalds br->topology_change_detected = 0; 9178872ccbSAdrian Drzewiecki spin_unlock_bh(&br->lock); 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds del_timer_sync(&br->hello_timer); 941da177e4SLinus Torvalds del_timer_sync(&br->topology_change_timer); 951da177e4SLinus Torvalds del_timer_sync(&br->tcn_timer); 961da177e4SLinus Torvalds del_timer_sync(&br->gc_timer); 971da177e4SLinus Torvalds } 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* called under bridge lock */ 1001da177e4SLinus Torvalds void br_stp_enable_port(struct net_bridge_port *p) 1011da177e4SLinus Torvalds { 1021da177e4SLinus Torvalds br_init_port(p); 1031da177e4SLinus Torvalds br_port_state_selection(p->br); 10428a16c97Sstephen hemminger br_log_state(p); 1054ecb961cSstephen hemminger br_ifinfo_notify(RTM_NEWLINK, p); 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds /* called under bridge lock */ 1091da177e4SLinus Torvalds void br_stp_disable_port(struct net_bridge_port *p) 1101da177e4SLinus Torvalds { 11128a16c97Sstephen hemminger struct net_bridge *br = p->br; 1121da177e4SLinus Torvalds int wasroot; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds wasroot = br_is_root_bridge(br); 1151da177e4SLinus Torvalds br_become_designated_port(p); 116775dd692SFlorian Fainelli br_set_state(p, BR_STATE_DISABLED); 1171da177e4SLinus Torvalds p->topology_change_ack = 0; 1181da177e4SLinus Torvalds p->config_pending = 0; 1191da177e4SLinus Torvalds 1205200959bSPaulius Zaleckas br_log_state(p); 1214ecb961cSstephen hemminger br_ifinfo_notify(RTM_NEWLINK, p); 1224ecb961cSstephen hemminger 1231da177e4SLinus Torvalds del_timer(&p->message_age_timer); 1241da177e4SLinus Torvalds del_timer(&p->forward_delay_timer); 1251da177e4SLinus Torvalds del_timer(&p->hold_timer); 1261da177e4SLinus Torvalds 1271ea2d020SNikolay Aleksandrov br_fdb_delete_by_port(br, p, 0, 0); 1283fe2d7c7SHerbert Xu br_multicast_disable_port(p); 1291a620698SStephen Hemminger 1301da177e4SLinus Torvalds br_configuration_update(br); 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds br_port_state_selection(br); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds if (br_is_root_bridge(br) && !wasroot) 1351da177e4SLinus Torvalds br_become_root_bridge(br); 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 1389cde0708SStephen Hemminger static void br_stp_start(struct net_bridge *br) 1399cde0708SStephen Hemminger { 1409cde0708SStephen Hemminger int r; 1419cde0708SStephen Hemminger char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL }; 1429cde0708SStephen Hemminger char *envp[] = { NULL }; 14376b91c32SNikolay Aleksandrov struct net_bridge_port *p; 1449cde0708SStephen Hemminger 145ff621985SHannes Frederic Sowa if (net_eq(dev_net(br->dev), &init_net)) 14686313c48SJeremy Fitzhardinge r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); 147ff621985SHannes Frederic Sowa else 148ff621985SHannes Frederic Sowa r = -ENOENT; 149be4f154dSHerbert Xu 150be4f154dSHerbert Xu spin_lock_bh(&br->lock); 151be4f154dSHerbert Xu 152be4f154dSHerbert Xu if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY) 153be4f154dSHerbert Xu __br_set_forward_delay(br, BR_MIN_FORWARD_DELAY); 1544b6c7879SVlad Yasevich else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY) 155be4f154dSHerbert Xu __br_set_forward_delay(br, BR_MAX_FORWARD_DELAY); 156be4f154dSHerbert Xu 1579cde0708SStephen Hemminger if (r == 0) { 1589cde0708SStephen Hemminger br->stp_enabled = BR_USER_STP; 15928a16c97Sstephen hemminger br_debug(br, "userspace STP started\n"); 16076b91c32SNikolay Aleksandrov /* Stop hello and hold timers */ 16176b91c32SNikolay Aleksandrov del_timer(&br->hello_timer); 16276b91c32SNikolay Aleksandrov list_for_each_entry(p, &br->port_list, list) 16376b91c32SNikolay Aleksandrov del_timer(&p->hold_timer); 1649cde0708SStephen Hemminger } else { 1659cde0708SStephen Hemminger br->stp_enabled = BR_KERNEL_STP; 16628a16c97Sstephen hemminger br_debug(br, "using kernel STP\n"); 1679cde0708SStephen Hemminger 1689cde0708SStephen Hemminger /* To start timers on any ports left in blocking */ 1699cde0708SStephen Hemminger br_port_state_selection(br); 1709cde0708SStephen Hemminger } 171be4f154dSHerbert Xu 172be4f154dSHerbert Xu spin_unlock_bh(&br->lock); 1739cde0708SStephen Hemminger } 1749cde0708SStephen Hemminger 1759cde0708SStephen Hemminger static void br_stp_stop(struct net_bridge *br) 1769cde0708SStephen Hemminger { 1779cde0708SStephen Hemminger int r; 1789cde0708SStephen Hemminger char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL }; 1799cde0708SStephen Hemminger char *envp[] = { NULL }; 18076b91c32SNikolay Aleksandrov struct net_bridge_port *p; 1819cde0708SStephen Hemminger 1829cde0708SStephen Hemminger if (br->stp_enabled == BR_USER_STP) { 1831a9180a2STomas Winkler r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); 18428a16c97Sstephen hemminger br_info(br, "userspace STP stopped, return code %d\n", r); 1859cde0708SStephen Hemminger 1869cde0708SStephen Hemminger /* To start timers on any ports left in blocking */ 18776b91c32SNikolay Aleksandrov mod_timer(&br->hello_timer, jiffies + br->hello_time); 18876b91c32SNikolay Aleksandrov list_for_each_entry(p, &br->port_list, list) 18976b91c32SNikolay Aleksandrov mod_timer(&p->hold_timer, 19076b91c32SNikolay Aleksandrov round_jiffies(jiffies + BR_HOLD_TIME)); 1919cde0708SStephen Hemminger spin_lock_bh(&br->lock); 1929cde0708SStephen Hemminger br_port_state_selection(br); 1939cde0708SStephen Hemminger spin_unlock_bh(&br->lock); 1949cde0708SStephen Hemminger } 1959cde0708SStephen Hemminger 1969cde0708SStephen Hemminger br->stp_enabled = BR_NO_STP; 1979cde0708SStephen Hemminger } 1989cde0708SStephen Hemminger 1999cde0708SStephen Hemminger void br_stp_set_enabled(struct net_bridge *br, unsigned long val) 2009cde0708SStephen Hemminger { 2019cde0708SStephen Hemminger ASSERT_RTNL(); 2029cde0708SStephen Hemminger 2039cde0708SStephen Hemminger if (val) { 2049cde0708SStephen Hemminger if (br->stp_enabled == BR_NO_STP) 2059cde0708SStephen Hemminger br_stp_start(br); 2069cde0708SStephen Hemminger } else { 2079cde0708SStephen Hemminger if (br->stp_enabled != BR_NO_STP) 2089cde0708SStephen Hemminger br_stp_stop(br); 2099cde0708SStephen Hemminger } 2109cde0708SStephen Hemminger } 2119cde0708SStephen Hemminger 2121da177e4SLinus Torvalds /* called under bridge lock */ 2134505a3efSStephen Hemminger void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) 2141da177e4SLinus Torvalds { 2159a7b6ef9SJoe Perches /* should be aligned on 2 bytes for ether_addr_equal() */ 21619bb3506SEvgeny Kravtsunov unsigned short oldaddr_aligned[ETH_ALEN >> 1]; 21719bb3506SEvgeny Kravtsunov unsigned char *oldaddr = (unsigned char *)oldaddr_aligned; 2181da177e4SLinus Torvalds struct net_bridge_port *p; 2191da177e4SLinus Torvalds int wasroot; 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds wasroot = br_is_root_bridge(br); 2221da177e4SLinus Torvalds 223a4b816d8SToshiaki Makita br_fdb_change_mac_address(br, addr); 224a4b816d8SToshiaki Makita 2251da177e4SLinus Torvalds memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); 2261da177e4SLinus Torvalds memcpy(br->bridge_id.addr, addr, ETH_ALEN); 2271da177e4SLinus Torvalds memcpy(br->dev->dev_addr, addr, ETH_ALEN); 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds list_for_each_entry(p, &br->port_list, list) { 2309a7b6ef9SJoe Perches if (ether_addr_equal(p->designated_bridge.addr, oldaddr)) 2311da177e4SLinus Torvalds memcpy(p->designated_bridge.addr, addr, ETH_ALEN); 2321da177e4SLinus Torvalds 2339a7b6ef9SJoe Perches if (ether_addr_equal(p->designated_root.addr, oldaddr)) 2341da177e4SLinus Torvalds memcpy(p->designated_root.addr, addr, ETH_ALEN); 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds br_configuration_update(br); 2381da177e4SLinus Torvalds br_port_state_selection(br); 2391da177e4SLinus Torvalds if (br_is_root_bridge(br) && !wasroot) 2401da177e4SLinus Torvalds br_become_root_bridge(br); 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2439a7b6ef9SJoe Perches /* should be aligned on 2 bytes for ether_addr_equal() */ 24419bb3506SEvgeny Kravtsunov static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1]; 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds /* called under bridge lock */ 247edf947f1Sstephen hemminger bool br_stp_recalculate_bridge_id(struct net_bridge *br) 2481da177e4SLinus Torvalds { 24919bb3506SEvgeny Kravtsunov const unsigned char *br_mac_zero = 25019bb3506SEvgeny Kravtsunov (const unsigned char *)br_mac_zero_aligned; 2511da177e4SLinus Torvalds const unsigned char *addr = br_mac_zero; 2521da177e4SLinus Torvalds struct net_bridge_port *p; 2531da177e4SLinus Torvalds 25492c0574fSStephen Hemminger /* user has chosen a value so keep it */ 255b2748267SJiri Pirko if (br->dev->addr_assign_type == NET_ADDR_SET) 2561459a3ccSBalaji G return false; 25792c0574fSStephen Hemminger 2581da177e4SLinus Torvalds list_for_each_entry(p, &br->port_list, list) { 2591da177e4SLinus Torvalds if (addr == br_mac_zero || 260554c9a8eSStephen Hemminger memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) 2611da177e4SLinus Torvalds addr = p->dev->dev_addr; 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds 2659a7b6ef9SJoe Perches if (ether_addr_equal(br->bridge_id.addr, addr)) 266edf947f1Sstephen hemminger return false; /* no change */ 267edf947f1Sstephen hemminger 2681da177e4SLinus Torvalds br_stp_change_bridge_id(br, addr); 269edf947f1Sstephen hemminger return true; 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2722dab80a8SNikolay Aleksandrov /* Acquires and releases bridge lock */ 2731da177e4SLinus Torvalds void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) 2741da177e4SLinus Torvalds { 2751da177e4SLinus Torvalds struct net_bridge_port *p; 2761da177e4SLinus Torvalds int wasroot; 2771da177e4SLinus Torvalds 2782dab80a8SNikolay Aleksandrov spin_lock_bh(&br->lock); 2791da177e4SLinus Torvalds wasroot = br_is_root_bridge(br); 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds list_for_each_entry(p, &br->port_list, list) { 2821da177e4SLinus Torvalds if (p->state != BR_STATE_DISABLED && 2831da177e4SLinus Torvalds br_is_designated_port(p)) { 2841da177e4SLinus Torvalds p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; 2851da177e4SLinus Torvalds p->designated_bridge.prio[1] = newprio & 0xFF; 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds } 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; 2911da177e4SLinus Torvalds br->bridge_id.prio[1] = newprio & 0xFF; 2921da177e4SLinus Torvalds br_configuration_update(br); 2931da177e4SLinus Torvalds br_port_state_selection(br); 2941da177e4SLinus Torvalds if (br_is_root_bridge(br) && !wasroot) 2951da177e4SLinus Torvalds br_become_root_bridge(br); 2962dab80a8SNikolay Aleksandrov spin_unlock_bh(&br->lock); 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds /* called under bridge lock */ 30014f98f25Sstephen hemminger int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio) 3011da177e4SLinus Torvalds { 30214f98f25Sstephen hemminger port_id new_port_id; 3031da177e4SLinus Torvalds 30414f98f25Sstephen hemminger if (newprio > BR_MAX_PORT_PRIORITY) 30514f98f25Sstephen hemminger return -ERANGE; 30614f98f25Sstephen hemminger 30714f98f25Sstephen hemminger new_port_id = br_make_port_id(newprio, p->port_no); 3081da177e4SLinus Torvalds if (br_is_designated_port(p)) 3091da177e4SLinus Torvalds p->designated_port = new_port_id; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds p->port_id = new_port_id; 3121da177e4SLinus Torvalds p->priority = newprio; 3131da177e4SLinus Torvalds if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && 3141da177e4SLinus Torvalds p->port_id < p->designated_port) { 3151da177e4SLinus Torvalds br_become_designated_port(p); 3161da177e4SLinus Torvalds br_port_state_selection(p->br); 3171da177e4SLinus Torvalds } 31814f98f25Sstephen hemminger 31914f98f25Sstephen hemminger return 0; 3201da177e4SLinus Torvalds } 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds /* called under bridge lock */ 32314f98f25Sstephen hemminger int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost) 3241da177e4SLinus Torvalds { 32514f98f25Sstephen hemminger if (path_cost < BR_MIN_PATH_COST || 32614f98f25Sstephen hemminger path_cost > BR_MAX_PATH_COST) 32714f98f25Sstephen hemminger return -ERANGE; 32814f98f25Sstephen hemminger 3298f3359bdSstephen hemminger p->flags |= BR_ADMIN_COST; 3301da177e4SLinus Torvalds p->path_cost = path_cost; 3311da177e4SLinus Torvalds br_configuration_update(p->br); 3321da177e4SLinus Torvalds br_port_state_selection(p->br); 33314f98f25Sstephen hemminger return 0; 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) 3371da177e4SLinus Torvalds { 3381da177e4SLinus Torvalds return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", 3391da177e4SLinus Torvalds id->prio[0], id->prio[1], 3401da177e4SLinus Torvalds id->addr[0], id->addr[1], id->addr[2], 3411da177e4SLinus Torvalds id->addr[3], id->addr[4], id->addr[5]); 3421da177e4SLinus Torvalds } 343