From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- net/bridge/br_stp_if.c | 351 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 351 insertions(+) create mode 100644 net/bridge/br_stp_if.c (limited to 'net/bridge/br_stp_if.c') diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c new file mode 100644 index 000000000..75204d36d --- /dev/null +++ b/net/bridge/br_stp_if.c @@ -0,0 +1,351 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Spanning tree protocol; interface code + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek + */ + +#include +#include +#include +#include +#include + +#include "br_private.h" +#include "br_private_stp.h" + + +/* Port id is composed of priority and port number. + * NB: some bits of priority are dropped to + * make room for more ports. + */ +static inline port_id br_make_port_id(__u8 priority, __u16 port_no) +{ + return ((u16)priority << BR_PORT_BITS) + | (port_no & ((1<> BR_PORT_BITS) + +/* called under bridge lock */ +void br_init_port(struct net_bridge_port *p) +{ + int err; + + p->port_id = br_make_port_id(p->priority, p->port_no); + br_become_designated_port(p); + br_set_state(p, BR_STATE_BLOCKING); + p->topology_change_ack = 0; + p->config_pending = 0; + + err = __set_ageing_time(p->dev, p->br->ageing_time); + if (err) + netdev_err(p->dev, "failed to offload ageing time\n"); +} + +/* NO locks held */ +void br_stp_enable_bridge(struct net_bridge *br) +{ + struct net_bridge_port *p; + + spin_lock_bh(&br->lock); + if (br->stp_enabled == BR_KERNEL_STP) + mod_timer(&br->hello_timer, jiffies + br->hello_time); + mod_delayed_work(system_long_wq, &br->gc_work, HZ / 10); + + br_config_bpdu_generation(br); + + list_for_each_entry(p, &br->port_list, list) { + if (netif_running(p->dev) && netif_oper_up(p->dev)) + br_stp_enable_port(p); + + } + spin_unlock_bh(&br->lock); +} + +/* NO locks held */ +void br_stp_disable_bridge(struct net_bridge *br) +{ + struct net_bridge_port *p; + + spin_lock_bh(&br->lock); + list_for_each_entry(p, &br->port_list, list) { + if (p->state != BR_STATE_DISABLED) + br_stp_disable_port(p); + + } + + __br_set_topology_change(br, 0); + br->topology_change_detected = 0; + spin_unlock_bh(&br->lock); + + del_timer_sync(&br->hello_timer); + del_timer_sync(&br->topology_change_timer); + del_timer_sync(&br->tcn_timer); + cancel_delayed_work_sync(&br->gc_work); +} + +/* called under bridge lock */ +void br_stp_enable_port(struct net_bridge_port *p) +{ + br_init_port(p); + br_port_state_selection(p->br); + br_ifinfo_notify(RTM_NEWLINK, NULL, p); +} + +/* called under bridge lock */ +void br_stp_disable_port(struct net_bridge_port *p) +{ + struct net_bridge *br = p->br; + int wasroot; + + wasroot = br_is_root_bridge(br); + br_become_designated_port(p); + br_set_state(p, BR_STATE_DISABLED); + p->topology_change_ack = 0; + p->config_pending = 0; + + br_ifinfo_notify(RTM_NEWLINK, NULL, p); + + del_timer(&p->message_age_timer); + del_timer(&p->forward_delay_timer); + del_timer(&p->hold_timer); + + if (!rcu_access_pointer(p->backup_port)) + br_fdb_delete_by_port(br, p, 0, 0); + br_multicast_disable_port(p); + + br_configuration_update(br); + + br_port_state_selection(br); + + if (br_is_root_bridge(br) && !wasroot) + br_become_root_bridge(br); +} + +static int br_stp_call_user(struct net_bridge *br, char *arg) +{ + char *argv[] = { BR_STP_PROG, br->dev->name, arg, NULL }; + char *envp[] = { NULL }; + int rc; + + /* call userspace STP and report program errors */ + rc = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); + if (rc > 0) { + if (rc & 0xff) + br_debug(br, BR_STP_PROG " received signal %d\n", + rc & 0x7f); + else + br_debug(br, BR_STP_PROG " exited with code %d\n", + (rc >> 8) & 0xff); + } + + return rc; +} + +static void br_stp_start(struct net_bridge *br) +{ + int err = -ENOENT; + + if (net_eq(dev_net(br->dev), &init_net)) + err = br_stp_call_user(br, "start"); + + if (err && err != -ENOENT) + br_err(br, "failed to start userspace STP (%d)\n", err); + + spin_lock_bh(&br->lock); + + if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY) + __br_set_forward_delay(br, BR_MIN_FORWARD_DELAY); + else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY) + __br_set_forward_delay(br, BR_MAX_FORWARD_DELAY); + + if (!err) { + br->stp_enabled = BR_USER_STP; + br_debug(br, "userspace STP started\n"); + } else { + br->stp_enabled = BR_KERNEL_STP; + br_debug(br, "using kernel STP\n"); + + /* To start timers on any ports left in blocking */ + if (br->dev->flags & IFF_UP) + mod_timer(&br->hello_timer, jiffies + br->hello_time); + br_port_state_selection(br); + } + + spin_unlock_bh(&br->lock); +} + +static void br_stp_stop(struct net_bridge *br) +{ + int err; + + if (br->stp_enabled == BR_USER_STP) { + err = br_stp_call_user(br, "stop"); + if (err) + br_err(br, "failed to stop userspace STP (%d)\n", err); + + /* To start timers on any ports left in blocking */ + spin_lock_bh(&br->lock); + br_port_state_selection(br); + spin_unlock_bh(&br->lock); + } + + br->stp_enabled = BR_NO_STP; +} + +int br_stp_set_enabled(struct net_bridge *br, unsigned long val, + struct netlink_ext_ack *extack) +{ + ASSERT_RTNL(); + + if (br_mrp_enabled(br)) { + NL_SET_ERR_MSG_MOD(extack, + "STP can't be enabled if MRP is already enabled"); + return -EINVAL; + } + + if (val) { + if (br->stp_enabled == BR_NO_STP) + br_stp_start(br); + } else { + if (br->stp_enabled != BR_NO_STP) + br_stp_stop(br); + } + + return 0; +} + +/* called under bridge lock */ +void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) +{ + /* should be aligned on 2 bytes for ether_addr_equal() */ + unsigned short oldaddr_aligned[ETH_ALEN >> 1]; + unsigned char *oldaddr = (unsigned char *)oldaddr_aligned; + struct net_bridge_port *p; + int wasroot; + + wasroot = br_is_root_bridge(br); + + br_fdb_change_mac_address(br, addr); + + memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); + memcpy(br->bridge_id.addr, addr, ETH_ALEN); + eth_hw_addr_set(br->dev, addr); + + list_for_each_entry(p, &br->port_list, list) { + if (ether_addr_equal(p->designated_bridge.addr, oldaddr)) + memcpy(p->designated_bridge.addr, addr, ETH_ALEN); + + if (ether_addr_equal(p->designated_root.addr, oldaddr)) + memcpy(p->designated_root.addr, addr, ETH_ALEN); + } + + br_configuration_update(br); + br_port_state_selection(br); + if (br_is_root_bridge(br) && !wasroot) + br_become_root_bridge(br); +} + +/* should be aligned on 2 bytes for ether_addr_equal() */ +static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1]; + +/* called under bridge lock */ +bool br_stp_recalculate_bridge_id(struct net_bridge *br) +{ + const unsigned char *br_mac_zero = + (const unsigned char *)br_mac_zero_aligned; + const unsigned char *addr = br_mac_zero; + struct net_bridge_port *p; + + /* user has chosen a value so keep it */ + if (br->dev->addr_assign_type == NET_ADDR_SET) + return false; + + list_for_each_entry(p, &br->port_list, list) { + if (addr == br_mac_zero || + memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) + addr = p->dev->dev_addr; + + } + + if (ether_addr_equal(br->bridge_id.addr, addr)) + return false; /* no change */ + + br_stp_change_bridge_id(br, addr); + return true; +} + +/* Acquires and releases bridge lock */ +void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) +{ + struct net_bridge_port *p; + int wasroot; + + spin_lock_bh(&br->lock); + wasroot = br_is_root_bridge(br); + + list_for_each_entry(p, &br->port_list, list) { + if (p->state != BR_STATE_DISABLED && + br_is_designated_port(p)) { + p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; + p->designated_bridge.prio[1] = newprio & 0xFF; + } + + } + + br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; + br->bridge_id.prio[1] = newprio & 0xFF; + br_configuration_update(br); + br_port_state_selection(br); + if (br_is_root_bridge(br) && !wasroot) + br_become_root_bridge(br); + spin_unlock_bh(&br->lock); +} + +/* called under bridge lock */ +int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio) +{ + port_id new_port_id; + + if (newprio > BR_MAX_PORT_PRIORITY) + return -ERANGE; + + new_port_id = br_make_port_id(newprio, p->port_no); + if (br_is_designated_port(p)) + p->designated_port = new_port_id; + + p->port_id = new_port_id; + p->priority = newprio; + if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && + p->port_id < p->designated_port) { + br_become_designated_port(p); + br_port_state_selection(p->br); + } + + return 0; +} + +/* called under bridge lock */ +int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost) +{ + if (path_cost < BR_MIN_PATH_COST || + path_cost > BR_MAX_PATH_COST) + return -ERANGE; + + p->flags |= BR_ADMIN_COST; + p->path_cost = path_cost; + br_configuration_update(p->br); + br_port_state_selection(p->br); + return 0; +} + +ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) +{ + return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", + id->prio[0], id->prio[1], + id->addr[0], id->addr[1], id->addr[2], + id->addr[3], id->addr[4], id->addr[5]); +} -- cgit v1.2.3