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https://github.com/torvalds/linux.git
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2f23e5cef3
Convert sw drivers from memcpy(... ETH_ADDR) to eth_hw_addr_set(): @@ expression dev, np; @@ - memcpy(dev->dev_addr, np, ETH_ALEN) + eth_hw_addr_set(dev, np) Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
352 lines
8.4 KiB
C
352 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Spanning tree protocol; interface code
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* Linux ethernet bridge
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*
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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*/
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#include <linux/kernel.h>
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#include <linux/kmod.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <net/switchdev.h>
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#include "br_private.h"
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#include "br_private_stp.h"
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/* Port id is composed of priority and port number.
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* NB: some bits of priority are dropped to
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* make room for more ports.
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*/
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static inline port_id br_make_port_id(__u8 priority, __u16 port_no)
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{
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return ((u16)priority << BR_PORT_BITS)
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}
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#define BR_MAX_PORT_PRIORITY ((u16)~0 >> BR_PORT_BITS)
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/* called under bridge lock */
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void br_init_port(struct net_bridge_port *p)
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{
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int err;
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p->port_id = br_make_port_id(p->priority, p->port_no);
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br_become_designated_port(p);
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br_set_state(p, BR_STATE_BLOCKING);
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p->topology_change_ack = 0;
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p->config_pending = 0;
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err = __set_ageing_time(p->dev, p->br->ageing_time);
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if (err)
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netdev_err(p->dev, "failed to offload ageing time\n");
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}
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/* NO locks held */
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void br_stp_enable_bridge(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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spin_lock_bh(&br->lock);
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if (br->stp_enabled == BR_KERNEL_STP)
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mod_timer(&br->hello_timer, jiffies + br->hello_time);
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mod_delayed_work(system_long_wq, &br->gc_work, HZ / 10);
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br_config_bpdu_generation(br);
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list_for_each_entry(p, &br->port_list, list) {
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if (netif_running(p->dev) && netif_oper_up(p->dev))
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br_stp_enable_port(p);
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}
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spin_unlock_bh(&br->lock);
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}
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/* NO locks held */
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void br_stp_disable_bridge(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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spin_lock_bh(&br->lock);
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list_for_each_entry(p, &br->port_list, list) {
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if (p->state != BR_STATE_DISABLED)
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br_stp_disable_port(p);
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}
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__br_set_topology_change(br, 0);
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br->topology_change_detected = 0;
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spin_unlock_bh(&br->lock);
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del_timer_sync(&br->hello_timer);
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del_timer_sync(&br->topology_change_timer);
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del_timer_sync(&br->tcn_timer);
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cancel_delayed_work_sync(&br->gc_work);
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}
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/* called under bridge lock */
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void br_stp_enable_port(struct net_bridge_port *p)
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{
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br_init_port(p);
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br_port_state_selection(p->br);
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br_ifinfo_notify(RTM_NEWLINK, NULL, p);
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}
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/* called under bridge lock */
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void br_stp_disable_port(struct net_bridge_port *p)
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{
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struct net_bridge *br = p->br;
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int wasroot;
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wasroot = br_is_root_bridge(br);
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br_become_designated_port(p);
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br_set_state(p, BR_STATE_DISABLED);
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p->topology_change_ack = 0;
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p->config_pending = 0;
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br_ifinfo_notify(RTM_NEWLINK, NULL, p);
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del_timer(&p->message_age_timer);
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del_timer(&p->forward_delay_timer);
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del_timer(&p->hold_timer);
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if (!rcu_access_pointer(p->backup_port))
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br_fdb_delete_by_port(br, p, 0, 0);
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br_multicast_disable_port(p);
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br_configuration_update(br);
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br_port_state_selection(br);
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if (br_is_root_bridge(br) && !wasroot)
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br_become_root_bridge(br);
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}
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static int br_stp_call_user(struct net_bridge *br, char *arg)
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{
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char *argv[] = { BR_STP_PROG, br->dev->name, arg, NULL };
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char *envp[] = { NULL };
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int rc;
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/* call userspace STP and report program errors */
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rc = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
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if (rc > 0) {
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if (rc & 0xff)
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br_debug(br, BR_STP_PROG " received signal %d\n",
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rc & 0x7f);
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else
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br_debug(br, BR_STP_PROG " exited with code %d\n",
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(rc >> 8) & 0xff);
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}
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return rc;
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}
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static void br_stp_start(struct net_bridge *br)
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{
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int err = -ENOENT;
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if (net_eq(dev_net(br->dev), &init_net))
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err = br_stp_call_user(br, "start");
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if (err && err != -ENOENT)
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br_err(br, "failed to start userspace STP (%d)\n", err);
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spin_lock_bh(&br->lock);
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if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY)
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__br_set_forward_delay(br, BR_MIN_FORWARD_DELAY);
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else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY)
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__br_set_forward_delay(br, BR_MAX_FORWARD_DELAY);
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if (!err) {
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br->stp_enabled = BR_USER_STP;
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br_debug(br, "userspace STP started\n");
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} else {
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br->stp_enabled = BR_KERNEL_STP;
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br_debug(br, "using kernel STP\n");
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/* To start timers on any ports left in blocking */
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if (br->dev->flags & IFF_UP)
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mod_timer(&br->hello_timer, jiffies + br->hello_time);
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br_port_state_selection(br);
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}
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spin_unlock_bh(&br->lock);
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}
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static void br_stp_stop(struct net_bridge *br)
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{
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int err;
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if (br->stp_enabled == BR_USER_STP) {
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err = br_stp_call_user(br, "stop");
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if (err)
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br_err(br, "failed to stop userspace STP (%d)\n", err);
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/* To start timers on any ports left in blocking */
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spin_lock_bh(&br->lock);
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br_port_state_selection(br);
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spin_unlock_bh(&br->lock);
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}
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br->stp_enabled = BR_NO_STP;
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}
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int br_stp_set_enabled(struct net_bridge *br, unsigned long val,
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struct netlink_ext_ack *extack)
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{
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ASSERT_RTNL();
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if (br_mrp_enabled(br)) {
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NL_SET_ERR_MSG_MOD(extack,
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"STP can't be enabled if MRP is already enabled");
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return -EINVAL;
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}
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if (val) {
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if (br->stp_enabled == BR_NO_STP)
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br_stp_start(br);
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} else {
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if (br->stp_enabled != BR_NO_STP)
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br_stp_stop(br);
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}
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return 0;
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}
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/* called under bridge lock */
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void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr)
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{
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/* should be aligned on 2 bytes for ether_addr_equal() */
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unsigned short oldaddr_aligned[ETH_ALEN >> 1];
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unsigned char *oldaddr = (unsigned char *)oldaddr_aligned;
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struct net_bridge_port *p;
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int wasroot;
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wasroot = br_is_root_bridge(br);
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br_fdb_change_mac_address(br, addr);
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memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);
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memcpy(br->bridge_id.addr, addr, ETH_ALEN);
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eth_hw_addr_set(br->dev, addr);
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list_for_each_entry(p, &br->port_list, list) {
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if (ether_addr_equal(p->designated_bridge.addr, oldaddr))
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memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
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if (ether_addr_equal(p->designated_root.addr, oldaddr))
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memcpy(p->designated_root.addr, addr, ETH_ALEN);
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}
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br_configuration_update(br);
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br_port_state_selection(br);
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if (br_is_root_bridge(br) && !wasroot)
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br_become_root_bridge(br);
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}
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/* should be aligned on 2 bytes for ether_addr_equal() */
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static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1];
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/* called under bridge lock */
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bool br_stp_recalculate_bridge_id(struct net_bridge *br)
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{
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const unsigned char *br_mac_zero =
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(const unsigned char *)br_mac_zero_aligned;
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const unsigned char *addr = br_mac_zero;
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struct net_bridge_port *p;
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/* user has chosen a value so keep it */
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if (br->dev->addr_assign_type == NET_ADDR_SET)
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return false;
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list_for_each_entry(p, &br->port_list, list) {
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if (addr == br_mac_zero ||
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memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
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addr = p->dev->dev_addr;
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}
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if (ether_addr_equal(br->bridge_id.addr, addr))
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return false; /* no change */
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br_stp_change_bridge_id(br, addr);
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return true;
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}
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/* Acquires and releases bridge lock */
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void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
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{
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struct net_bridge_port *p;
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int wasroot;
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spin_lock_bh(&br->lock);
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wasroot = br_is_root_bridge(br);
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list_for_each_entry(p, &br->port_list, list) {
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if (p->state != BR_STATE_DISABLED &&
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br_is_designated_port(p)) {
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p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF;
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p->designated_bridge.prio[1] = newprio & 0xFF;
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}
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}
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br->bridge_id.prio[0] = (newprio >> 8) & 0xFF;
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br->bridge_id.prio[1] = newprio & 0xFF;
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br_configuration_update(br);
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br_port_state_selection(br);
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if (br_is_root_bridge(br) && !wasroot)
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br_become_root_bridge(br);
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spin_unlock_bh(&br->lock);
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}
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/* called under bridge lock */
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int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio)
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{
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port_id new_port_id;
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if (newprio > BR_MAX_PORT_PRIORITY)
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return -ERANGE;
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new_port_id = br_make_port_id(newprio, p->port_no);
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if (br_is_designated_port(p))
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p->designated_port = new_port_id;
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p->port_id = new_port_id;
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p->priority = newprio;
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if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) &&
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p->port_id < p->designated_port) {
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br_become_designated_port(p);
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br_port_state_selection(p->br);
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}
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return 0;
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}
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/* called under bridge lock */
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int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost)
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{
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if (path_cost < BR_MIN_PATH_COST ||
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path_cost > BR_MAX_PATH_COST)
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return -ERANGE;
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p->flags |= BR_ADMIN_COST;
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p->path_cost = path_cost;
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br_configuration_update(p->br);
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br_port_state_selection(p->br);
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return 0;
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}
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ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id)
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{
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return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n",
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id->prio[0], id->prio[1],
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id->addr[0], id->addr[1], id->addr[2],
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id->addr[3], id->addr[4], id->addr[5]);
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}
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