Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 165 insertions, 0 deletions

diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c
new file mode 100644
index 000000000..e7739de5f
--- /dev/null
+++ b/net/bridge/br_stp_timer.c
@@ -0,0 +1,165 @@
+/*
+ *	Spanning tree protocol; timer-related code
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	as published by the Free Software Foundation; either version
+ *	2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/times.h>
+
+#include "br_private.h"
+#include "br_private_stp.h"
+
+/* called under bridge lock */
+static int br_is_designated_for_some_port(const struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (p->state != BR_STATE_DISABLED &&
+		    !memcmp(&p->designated_bridge, &br->bridge_id, 8))
+			return 1;
+	}
+
+	return 0;
+}
+
+static void br_hello_timer_expired(struct timer_list *t)
+{
+	struct net_bridge *br = from_timer(br, t, hello_timer);
+
+	br_debug(br, "hello timer expired\n");
+	spin_lock(&br->lock);
+	if (br->dev->flags & IFF_UP) {
+		br_config_bpdu_generation(br);
+
+		if (br->stp_enabled == BR_KERNEL_STP)
+			mod_timer(&br->hello_timer,
+				  round_jiffies(jiffies + br->hello_time));
+	}
+	spin_unlock(&br->lock);
+}
+
+static void br_message_age_timer_expired(struct timer_list *t)
+{
+	struct net_bridge_port *p = from_timer(p, t, message_age_timer);
+	struct net_bridge *br = p->br;
+	const bridge_id *id = &p->designated_bridge;
+	int was_root;
+
+	if (p->state == BR_STATE_DISABLED)
+		return;
+
+	br_info(br, "port %u(%s) neighbor %.2x%.2x.%pM lost\n",
+		(unsigned int) p->port_no, p->dev->name,
+		id->prio[0], id->prio[1], &id->addr);
+
+	/*
+	 * According to the spec, the message age timer cannot be
+	 * running when we are the root bridge. So..  this was_root
+	 * check is redundant. I'm leaving it in for now, though.
+	 */
+	spin_lock(&br->lock);
+	if (p->state == BR_STATE_DISABLED)
+		goto unlock;
+	was_root = br_is_root_bridge(br);
+
+	br_become_designated_port(p);
+	br_configuration_update(br);
+	br_port_state_selection(br);
+	if (br_is_root_bridge(br) && !was_root)
+		br_become_root_bridge(br);
+ unlock:
+	spin_unlock(&br->lock);
+}
+
+static void br_forward_delay_timer_expired(struct timer_list *t)
+{
+	struct net_bridge_port *p = from_timer(p, t, forward_delay_timer);
+	struct net_bridge *br = p->br;
+
+	br_debug(br, "port %u(%s) forward delay timer\n",
+		 (unsigned int) p->port_no, p->dev->name);
+	spin_lock(&br->lock);
+	if (p->state == BR_STATE_LISTENING) {
+		br_set_state(p, BR_STATE_LEARNING);
+		mod_timer(&p->forward_delay_timer,
+			  jiffies + br->forward_delay);
+	} else if (p->state == BR_STATE_LEARNING) {
+		br_set_state(p, BR_STATE_FORWARDING);
+		if (br_is_designated_for_some_port(br))
+			br_topology_change_detection(br);
+		netif_carrier_on(br->dev);
+	}
+	rcu_read_lock();
+	br_ifinfo_notify(RTM_NEWLINK, NULL, p);
+	rcu_read_unlock();
+	spin_unlock(&br->lock);
+}
+
+static void br_tcn_timer_expired(struct timer_list *t)
+{
+	struct net_bridge *br = from_timer(br, t, tcn_timer);
+
+	br_debug(br, "tcn timer expired\n");
+	spin_lock(&br->lock);
+	if (!br_is_root_bridge(br) && (br->dev->flags & IFF_UP)) {
+		br_transmit_tcn(br);
+
+		mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time);
+	}
+	spin_unlock(&br->lock);
+}
+
+static void br_topology_change_timer_expired(struct timer_list *t)
+{
+	struct net_bridge *br = from_timer(br, t, topology_change_timer);
+
+	br_debug(br, "topo change timer expired\n");
+	spin_lock(&br->lock);
+	br->topology_change_detected = 0;
+	__br_set_topology_change(br, 0);
+	spin_unlock(&br->lock);
+}
+
+static void br_hold_timer_expired(struct timer_list *t)
+{
+	struct net_bridge_port *p = from_timer(p, t, hold_timer);
+
+	br_debug(p->br, "port %u(%s) hold timer expired\n",
+		 (unsigned int) p->port_no, p->dev->name);
+
+	spin_lock(&p->br->lock);
+	if (p->config_pending)
+		br_transmit_config(p);
+	spin_unlock(&p->br->lock);
+}
+
+void br_stp_timer_init(struct net_bridge *br)
+{
+	timer_setup(&br->hello_timer, br_hello_timer_expired, 0);
+	timer_setup(&br->tcn_timer, br_tcn_timer_expired, 0);
+	timer_setup(&br->topology_change_timer,
+		    br_topology_change_timer_expired, 0);
+}
+
+void br_stp_port_timer_init(struct net_bridge_port *p)
+{
+	timer_setup(&p->message_age_timer, br_message_age_timer_expired, 0);
+	timer_setup(&p->forward_delay_timer, br_forward_delay_timer_expired, 0);
+	timer_setup(&p->hold_timer, br_hold_timer_expired, 0);
+}
+
+/* Report ticks left (in USER_HZ) used for API */
+unsigned long br_timer_value(const struct timer_list *timer)
+{
+	return timer_pending(timer)
+		? jiffies_delta_to_clock_t(timer->expires - jiffies) : 0;
+}