![Madhuparna Bhowmik](/assets/img/avatar_default.png)
list_for_each_entry_rcu() has built-in RCU and lock checking. Pass cond argument to list_for_each_entry_rcu() to silence false lockdep warning when CONFIG_PROVE_RCU_LIST is enabled by default. Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
675 lines
16 KiB
C
675 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Spanning tree protocol; generic parts
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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/rculist.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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/* since time values in bpdu are in jiffies and then scaled (1/256)
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* before sending, make sure that is at least one STP tick.
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*/
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#define MESSAGE_AGE_INCR ((HZ / 256) + 1)
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static const char *const br_port_state_names[] = {
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[BR_STATE_DISABLED] = "disabled",
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[BR_STATE_LISTENING] = "listening",
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[BR_STATE_LEARNING] = "learning",
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[BR_STATE_FORWARDING] = "forwarding",
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[BR_STATE_BLOCKING] = "blocking",
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};
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void br_set_state(struct net_bridge_port *p, unsigned int state)
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{
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struct switchdev_attr attr = {
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.orig_dev = p->dev,
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.id = SWITCHDEV_ATTR_ID_PORT_STP_STATE,
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.flags = SWITCHDEV_F_DEFER,
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.u.stp_state = state,
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};
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int err;
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p->state = state;
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err = switchdev_port_attr_set(p->dev, &attr);
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if (err && err != -EOPNOTSUPP)
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br_warn(p->br, "error setting offload STP state on port %u(%s)\n",
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(unsigned int) p->port_no, p->dev->name);
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else
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br_info(p->br, "port %u(%s) entered %s state\n",
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(unsigned int) p->port_no, p->dev->name,
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br_port_state_names[p->state]);
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if (p->br->stp_enabled == BR_KERNEL_STP) {
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switch (p->state) {
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case BR_STATE_BLOCKING:
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p->stp_xstats.transition_blk++;
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break;
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case BR_STATE_FORWARDING:
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p->stp_xstats.transition_fwd++;
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break;
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}
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}
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}
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/* called under bridge lock */
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struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no)
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{
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struct net_bridge_port *p;
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list_for_each_entry_rcu(p, &br->port_list, list,
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lockdep_is_held(&br->lock)) {
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if (p->port_no == port_no)
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return p;
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}
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return NULL;
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}
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/* called under bridge lock */
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static int br_should_become_root_port(const struct net_bridge_port *p,
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u16 root_port)
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{
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struct net_bridge *br;
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struct net_bridge_port *rp;
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int t;
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br = p->br;
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if (p->state == BR_STATE_DISABLED ||
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br_is_designated_port(p))
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return 0;
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if (memcmp(&br->bridge_id, &p->designated_root, 8) <= 0)
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return 0;
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if (!root_port)
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return 1;
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rp = br_get_port(br, root_port);
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t = memcmp(&p->designated_root, &rp->designated_root, 8);
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if (t < 0)
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return 1;
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else if (t > 0)
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return 0;
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if (p->designated_cost + p->path_cost <
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rp->designated_cost + rp->path_cost)
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return 1;
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else if (p->designated_cost + p->path_cost >
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rp->designated_cost + rp->path_cost)
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return 0;
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t = memcmp(&p->designated_bridge, &rp->designated_bridge, 8);
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if (t < 0)
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return 1;
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else if (t > 0)
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return 0;
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if (p->designated_port < rp->designated_port)
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return 1;
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else if (p->designated_port > rp->designated_port)
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return 0;
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if (p->port_id < rp->port_id)
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return 1;
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return 0;
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}
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static void br_root_port_block(const struct net_bridge *br,
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struct net_bridge_port *p)
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{
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br_notice(br, "port %u(%s) tried to become root port (blocked)",
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(unsigned int) p->port_no, p->dev->name);
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br_set_state(p, BR_STATE_LISTENING);
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br_ifinfo_notify(RTM_NEWLINK, NULL, p);
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if (br->forward_delay > 0)
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mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay);
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}
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/* called under bridge lock */
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static void br_root_selection(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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u16 root_port = 0;
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list_for_each_entry(p, &br->port_list, list) {
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if (!br_should_become_root_port(p, root_port))
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continue;
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if (p->flags & BR_ROOT_BLOCK)
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br_root_port_block(br, p);
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else
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root_port = p->port_no;
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}
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br->root_port = root_port;
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if (!root_port) {
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br->designated_root = br->bridge_id;
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br->root_path_cost = 0;
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} else {
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p = br_get_port(br, root_port);
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br->designated_root = p->designated_root;
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br->root_path_cost = p->designated_cost + p->path_cost;
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}
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}
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/* called under bridge lock */
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void br_become_root_bridge(struct net_bridge *br)
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{
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br->max_age = br->bridge_max_age;
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br->hello_time = br->bridge_hello_time;
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br->forward_delay = br->bridge_forward_delay;
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br_topology_change_detection(br);
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del_timer(&br->tcn_timer);
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if (br->dev->flags & IFF_UP) {
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br_config_bpdu_generation(br);
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mod_timer(&br->hello_timer, jiffies + br->hello_time);
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}
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}
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/* called under bridge lock */
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void br_transmit_config(struct net_bridge_port *p)
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{
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struct br_config_bpdu bpdu;
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struct net_bridge *br;
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if (timer_pending(&p->hold_timer)) {
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p->config_pending = 1;
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return;
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}
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br = p->br;
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bpdu.topology_change = br->topology_change;
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bpdu.topology_change_ack = p->topology_change_ack;
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bpdu.root = br->designated_root;
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bpdu.root_path_cost = br->root_path_cost;
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bpdu.bridge_id = br->bridge_id;
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bpdu.port_id = p->port_id;
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if (br_is_root_bridge(br))
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bpdu.message_age = 0;
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else {
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struct net_bridge_port *root
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= br_get_port(br, br->root_port);
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bpdu.message_age = (jiffies - root->designated_age)
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+ MESSAGE_AGE_INCR;
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}
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bpdu.max_age = br->max_age;
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bpdu.hello_time = br->hello_time;
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bpdu.forward_delay = br->forward_delay;
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if (bpdu.message_age < br->max_age) {
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br_send_config_bpdu(p, &bpdu);
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p->topology_change_ack = 0;
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p->config_pending = 0;
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if (p->br->stp_enabled == BR_KERNEL_STP)
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mod_timer(&p->hold_timer,
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round_jiffies(jiffies + BR_HOLD_TIME));
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}
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}
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/* called under bridge lock */
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static void br_record_config_information(struct net_bridge_port *p,
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const struct br_config_bpdu *bpdu)
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{
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p->designated_root = bpdu->root;
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p->designated_cost = bpdu->root_path_cost;
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p->designated_bridge = bpdu->bridge_id;
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p->designated_port = bpdu->port_id;
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p->designated_age = jiffies - bpdu->message_age;
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mod_timer(&p->message_age_timer, jiffies
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+ (bpdu->max_age - bpdu->message_age));
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}
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/* called under bridge lock */
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static void br_record_config_timeout_values(struct net_bridge *br,
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const struct br_config_bpdu *bpdu)
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{
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br->max_age = bpdu->max_age;
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br->hello_time = bpdu->hello_time;
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br->forward_delay = bpdu->forward_delay;
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__br_set_topology_change(br, bpdu->topology_change);
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}
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/* called under bridge lock */
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void br_transmit_tcn(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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p = br_get_port(br, br->root_port);
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if (p)
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br_send_tcn_bpdu(p);
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else
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br_notice(br, "root port %u not found for topology notice\n",
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br->root_port);
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}
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/* called under bridge lock */
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static int br_should_become_designated_port(const struct net_bridge_port *p)
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{
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struct net_bridge *br;
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int t;
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br = p->br;
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if (br_is_designated_port(p))
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return 1;
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if (memcmp(&p->designated_root, &br->designated_root, 8))
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return 1;
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if (br->root_path_cost < p->designated_cost)
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return 1;
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else if (br->root_path_cost > p->designated_cost)
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return 0;
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t = memcmp(&br->bridge_id, &p->designated_bridge, 8);
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if (t < 0)
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return 1;
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else if (t > 0)
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return 0;
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if (p->port_id < p->designated_port)
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return 1;
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return 0;
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}
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/* called under bridge lock */
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static void br_designated_port_selection(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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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_should_become_designated_port(p))
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br_become_designated_port(p);
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}
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}
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/* called under bridge lock */
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static int br_supersedes_port_info(const struct net_bridge_port *p,
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const struct br_config_bpdu *bpdu)
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{
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int t;
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t = memcmp(&bpdu->root, &p->designated_root, 8);
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if (t < 0)
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return 1;
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else if (t > 0)
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return 0;
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if (bpdu->root_path_cost < p->designated_cost)
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return 1;
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else if (bpdu->root_path_cost > p->designated_cost)
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return 0;
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t = memcmp(&bpdu->bridge_id, &p->designated_bridge, 8);
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if (t < 0)
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return 1;
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else if (t > 0)
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return 0;
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if (memcmp(&bpdu->bridge_id, &p->br->bridge_id, 8))
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return 1;
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if (bpdu->port_id <= p->designated_port)
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return 1;
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return 0;
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}
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/* called under bridge lock */
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static void br_topology_change_acknowledged(struct net_bridge *br)
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{
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br->topology_change_detected = 0;
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del_timer(&br->tcn_timer);
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}
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/* called under bridge lock */
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void br_topology_change_detection(struct net_bridge *br)
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{
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int isroot = br_is_root_bridge(br);
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if (br->stp_enabled != BR_KERNEL_STP)
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return;
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br_info(br, "topology change detected, %s\n",
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isroot ? "propagating" : "sending tcn bpdu");
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if (isroot) {
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__br_set_topology_change(br, 1);
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mod_timer(&br->topology_change_timer, jiffies
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+ br->bridge_forward_delay + br->bridge_max_age);
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} else if (!br->topology_change_detected) {
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br_transmit_tcn(br);
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mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time);
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}
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br->topology_change_detected = 1;
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}
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/* called under bridge lock */
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void br_config_bpdu_generation(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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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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br_transmit_config(p);
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}
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}
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/* called under bridge lock */
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static void br_reply(struct net_bridge_port *p)
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{
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br_transmit_config(p);
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}
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/* called under bridge lock */
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void br_configuration_update(struct net_bridge *br)
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{
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br_root_selection(br);
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br_designated_port_selection(br);
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}
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/* called under bridge lock */
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void br_become_designated_port(struct net_bridge_port *p)
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{
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struct net_bridge *br;
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br = p->br;
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p->designated_root = br->designated_root;
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p->designated_cost = br->root_path_cost;
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p->designated_bridge = br->bridge_id;
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p->designated_port = p->port_id;
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}
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/* called under bridge lock */
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static void br_make_blocking(struct net_bridge_port *p)
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{
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if (p->state != BR_STATE_DISABLED &&
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p->state != BR_STATE_BLOCKING) {
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if (p->state == BR_STATE_FORWARDING ||
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p->state == BR_STATE_LEARNING)
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br_topology_change_detection(p->br);
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br_set_state(p, BR_STATE_BLOCKING);
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br_ifinfo_notify(RTM_NEWLINK, NULL, p);
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del_timer(&p->forward_delay_timer);
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}
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}
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/* called under bridge lock */
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static void br_make_forwarding(struct net_bridge_port *p)
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{
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struct net_bridge *br = p->br;
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if (p->state != BR_STATE_BLOCKING)
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return;
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if (br->stp_enabled == BR_NO_STP || br->forward_delay == 0) {
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br_set_state(p, BR_STATE_FORWARDING);
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br_topology_change_detection(br);
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del_timer(&p->forward_delay_timer);
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} else if (br->stp_enabled == BR_KERNEL_STP)
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br_set_state(p, BR_STATE_LISTENING);
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else
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br_set_state(p, BR_STATE_LEARNING);
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br_ifinfo_notify(RTM_NEWLINK, NULL, p);
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if (br->forward_delay != 0)
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mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay);
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}
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/* called under bridge lock */
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void br_port_state_selection(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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unsigned int liveports = 0;
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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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continue;
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/* Don't change port states if userspace is handling STP */
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if (br->stp_enabled != BR_USER_STP) {
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if (p->port_no == br->root_port) {
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p->config_pending = 0;
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p->topology_change_ack = 0;
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br_make_forwarding(p);
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} else if (br_is_designated_port(p)) {
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del_timer(&p->message_age_timer);
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br_make_forwarding(p);
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} else {
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p->config_pending = 0;
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p->topology_change_ack = 0;
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br_make_blocking(p);
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}
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}
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if (p->state != BR_STATE_BLOCKING)
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br_multicast_enable_port(p);
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/* Multicast is not disabled for the port when it goes in
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* blocking state because the timers will expire and stop by
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* themselves without sending more queries.
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*/
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if (p->state == BR_STATE_FORWARDING)
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++liveports;
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}
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if (liveports == 0)
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netif_carrier_off(br->dev);
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else
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netif_carrier_on(br->dev);
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}
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/* called under bridge lock */
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static void br_topology_change_acknowledge(struct net_bridge_port *p)
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{
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p->topology_change_ack = 1;
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br_transmit_config(p);
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}
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/* called under bridge lock */
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void br_received_config_bpdu(struct net_bridge_port *p,
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const struct br_config_bpdu *bpdu)
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{
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struct net_bridge *br;
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int was_root;
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p->stp_xstats.rx_bpdu++;
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br = p->br;
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was_root = br_is_root_bridge(br);
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if (br_supersedes_port_info(p, bpdu)) {
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br_record_config_information(p, bpdu);
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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) && was_root) {
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del_timer(&br->hello_timer);
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if (br->topology_change_detected) {
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del_timer(&br->topology_change_timer);
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br_transmit_tcn(br);
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mod_timer(&br->tcn_timer,
|
|
jiffies + br->bridge_hello_time);
|
|
}
|
|
}
|
|
|
|
if (p->port_no == br->root_port) {
|
|
br_record_config_timeout_values(br, bpdu);
|
|
br_config_bpdu_generation(br);
|
|
if (bpdu->topology_change_ack)
|
|
br_topology_change_acknowledged(br);
|
|
}
|
|
} else if (br_is_designated_port(p)) {
|
|
br_reply(p);
|
|
}
|
|
}
|
|
|
|
/* called under bridge lock */
|
|
void br_received_tcn_bpdu(struct net_bridge_port *p)
|
|
{
|
|
p->stp_xstats.rx_tcn++;
|
|
|
|
if (br_is_designated_port(p)) {
|
|
br_info(p->br, "port %u(%s) received tcn bpdu\n",
|
|
(unsigned int) p->port_no, p->dev->name);
|
|
|
|
br_topology_change_detection(p->br);
|
|
br_topology_change_acknowledge(p);
|
|
}
|
|
}
|
|
|
|
/* Change bridge STP parameter */
|
|
int br_set_hello_time(struct net_bridge *br, unsigned long val)
|
|
{
|
|
unsigned long t = clock_t_to_jiffies(val);
|
|
|
|
if (t < BR_MIN_HELLO_TIME || t > BR_MAX_HELLO_TIME)
|
|
return -ERANGE;
|
|
|
|
spin_lock_bh(&br->lock);
|
|
br->bridge_hello_time = t;
|
|
if (br_is_root_bridge(br))
|
|
br->hello_time = br->bridge_hello_time;
|
|
spin_unlock_bh(&br->lock);
|
|
return 0;
|
|
}
|
|
|
|
int br_set_max_age(struct net_bridge *br, unsigned long val)
|
|
{
|
|
unsigned long t = clock_t_to_jiffies(val);
|
|
|
|
if (t < BR_MIN_MAX_AGE || t > BR_MAX_MAX_AGE)
|
|
return -ERANGE;
|
|
|
|
spin_lock_bh(&br->lock);
|
|
br->bridge_max_age = t;
|
|
if (br_is_root_bridge(br))
|
|
br->max_age = br->bridge_max_age;
|
|
spin_unlock_bh(&br->lock);
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* called under bridge lock */
|
|
int __set_ageing_time(struct net_device *dev, unsigned long t)
|
|
{
|
|
struct switchdev_attr attr = {
|
|
.orig_dev = dev,
|
|
.id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
|
|
.flags = SWITCHDEV_F_SKIP_EOPNOTSUPP | SWITCHDEV_F_DEFER,
|
|
.u.ageing_time = jiffies_to_clock_t(t),
|
|
};
|
|
int err;
|
|
|
|
err = switchdev_port_attr_set(dev, &attr);
|
|
if (err && err != -EOPNOTSUPP)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Set time interval that dynamic forwarding entries live
|
|
* For pure software bridge, allow values outside the 802.1
|
|
* standard specification for special cases:
|
|
* 0 - entry never ages (all permanant)
|
|
* 1 - entry disappears (no persistance)
|
|
*
|
|
* Offloaded switch entries maybe more restrictive
|
|
*/
|
|
int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time)
|
|
{
|
|
unsigned long t = clock_t_to_jiffies(ageing_time);
|
|
int err;
|
|
|
|
err = __set_ageing_time(br->dev, t);
|
|
if (err)
|
|
return err;
|
|
|
|
spin_lock_bh(&br->lock);
|
|
br->bridge_ageing_time = t;
|
|
br->ageing_time = t;
|
|
spin_unlock_bh(&br->lock);
|
|
|
|
mod_delayed_work(system_long_wq, &br->gc_work, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* called under bridge lock */
|
|
void __br_set_topology_change(struct net_bridge *br, unsigned char val)
|
|
{
|
|
unsigned long t;
|
|
int err;
|
|
|
|
if (br->stp_enabled == BR_KERNEL_STP && br->topology_change != val) {
|
|
/* On topology change, set the bridge ageing time to twice the
|
|
* forward delay. Otherwise, restore its default ageing time.
|
|
*/
|
|
|
|
if (val) {
|
|
t = 2 * br->forward_delay;
|
|
br_debug(br, "decreasing ageing time to %lu\n", t);
|
|
} else {
|
|
t = br->bridge_ageing_time;
|
|
br_debug(br, "restoring ageing time to %lu\n", t);
|
|
}
|
|
|
|
err = __set_ageing_time(br->dev, t);
|
|
if (err)
|
|
br_warn(br, "error offloading ageing time\n");
|
|
else
|
|
br->ageing_time = t;
|
|
}
|
|
|
|
br->topology_change = val;
|
|
}
|
|
|
|
void __br_set_forward_delay(struct net_bridge *br, unsigned long t)
|
|
{
|
|
br->bridge_forward_delay = t;
|
|
if (br_is_root_bridge(br))
|
|
br->forward_delay = br->bridge_forward_delay;
|
|
}
|
|
|
|
int br_set_forward_delay(struct net_bridge *br, unsigned long val)
|
|
{
|
|
unsigned long t = clock_t_to_jiffies(val);
|
|
int err = -ERANGE;
|
|
|
|
spin_lock_bh(&br->lock);
|
|
if (br->stp_enabled != BR_NO_STP &&
|
|
(t < BR_MIN_FORWARD_DELAY || t > BR_MAX_FORWARD_DELAY))
|
|
goto unlock;
|
|
|
|
__br_set_forward_delay(br, t);
|
|
err = 0;
|
|
|
|
unlock:
|
|
spin_unlock_bh(&br->lock);
|
|
return err;
|
|
}
|