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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Bridge Multiple Spanning Tree Support
*
* Authors:
* Tobias Waldekranz <tobias@waldekranz.com>
*/
#include <linux/kernel.h>
#include "br_private.h"
DEFINE_STATIC_KEY_FALSE(br_mst_used);
static void br_mst_vlan_set_state(struct net_bridge_port *p, struct net_bridge_vlan *v,
u8 state)
{
struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
if (v->state == state)
return;
br_vlan_set_state(v, state);
if (v->vid == vg->pvid)
br_vlan_set_pvid_state(vg, state);
}
int br_mst_set_state(struct net_bridge_port *p, u16 msti, u8 state,
struct netlink_ext_ack *extack)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *v;
vg = nbp_vlan_group(p);
if (!vg)
return 0;
list_for_each_entry(v, &vg->vlan_list, vlist) {
if (v->brvlan->msti != msti)
continue;
br_mst_vlan_set_state(p, v, state);
}
return 0;
}
static void br_mst_vlan_sync_state(struct net_bridge_vlan *pv, u16 msti)
{
struct net_bridge_vlan_group *vg = nbp_vlan_group(pv->port);
struct net_bridge_vlan *v;
list_for_each_entry(v, &vg->vlan_list, vlist) {
/* If this port already has a defined state in this
* MSTI (through some other VLAN membership), inherit
* it.
*/
if (v != pv && v->brvlan->msti == msti) {
br_mst_vlan_set_state(pv->port, pv, v->state);
return;
}
}
/* Otherwise, start out in a new MSTI with all ports disabled. */
return br_mst_vlan_set_state(pv->port, pv, BR_STATE_DISABLED);
}
int br_mst_vlan_set_msti(struct net_bridge_vlan *mv, u16 msti)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *pv;
struct net_bridge_port *p;
if (mv->msti == msti)
return 0;
mv->msti = msti;
list_for_each_entry(p, &mv->br->port_list, list) {
vg = nbp_vlan_group(p);
pv = br_vlan_find(vg, mv->vid);
if (pv)
br_mst_vlan_sync_state(pv, msti);
}
return 0;
}
void br_mst_vlan_init_state(struct net_bridge_vlan *v)
{
/* VLANs always start out in MSTI 0 (CST) */
v->msti = 0;
if (br_vlan_is_master(v))
v->state = BR_STATE_FORWARDING;
else
v->state = v->port->state;
}
int br_mst_set_enabled(struct net_bridge *br, bool on,
struct netlink_ext_ack *extack)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p;
list_for_each_entry(p, &br->port_list, list) {
vg = nbp_vlan_group(p);
if (!vg->num_vlans)
continue;
NL_SET_ERR_MSG(extack,
"MST mode can't be changed while VLANs exist");
return -EBUSY;
}
if (br_opt_get(br, BROPT_MST_ENABLED) == on)
return 0;
if (on)
static_branch_enable(&br_mst_used);
else
static_branch_disable(&br_mst_used);
br_opt_toggle(br, BROPT_MST_ENABLED, on);
return 0;
}
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