mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Tobias Waldekranz](/assets/img/avatar_default.png)
This is useful for switchdev drivers who are offloading MST states into hardware. As an example, a driver may wish to flush the FDB for a port when it transitions from forwarding to blocking - which means that the previous state must be discoverable. Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Acked-by: Nikolay Aleksandrov <razor@blackwall.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
357 lines
7.6 KiB
C
357 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Bridge Multiple Spanning Tree Support
|
|
*
|
|
* Authors:
|
|
* Tobias Waldekranz <tobias@waldekranz.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <net/switchdev.h>
|
|
|
|
#include "br_private.h"
|
|
|
|
DEFINE_STATIC_KEY_FALSE(br_mst_used);
|
|
|
|
bool br_mst_enabled(const struct net_device *dev)
|
|
{
|
|
if (!netif_is_bridge_master(dev))
|
|
return false;
|
|
|
|
return br_opt_get(netdev_priv(dev), BROPT_MST_ENABLED);
|
|
}
|
|
EXPORT_SYMBOL_GPL(br_mst_enabled);
|
|
|
|
int br_mst_get_info(const struct net_device *dev, u16 msti, unsigned long *vids)
|
|
{
|
|
const struct net_bridge_vlan_group *vg;
|
|
const struct net_bridge_vlan *v;
|
|
const struct net_bridge *br;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!netif_is_bridge_master(dev))
|
|
return -EINVAL;
|
|
|
|
br = netdev_priv(dev);
|
|
if (!br_opt_get(br, BROPT_MST_ENABLED))
|
|
return -EINVAL;
|
|
|
|
vg = br_vlan_group(br);
|
|
|
|
list_for_each_entry(v, &vg->vlan_list, vlist) {
|
|
if (v->msti == msti)
|
|
__set_bit(v->vid, vids);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(br_mst_get_info);
|
|
|
|
int br_mst_get_state(const struct net_device *dev, u16 msti, u8 *state)
|
|
{
|
|
const struct net_bridge_port *p = NULL;
|
|
const struct net_bridge_vlan_group *vg;
|
|
const struct net_bridge_vlan *v;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
p = br_port_get_check_rtnl(dev);
|
|
if (!p || !br_opt_get(p->br, BROPT_MST_ENABLED))
|
|
return -EINVAL;
|
|
|
|
vg = nbp_vlan_group(p);
|
|
|
|
list_for_each_entry(v, &vg->vlan_list, vlist) {
|
|
if (v->brvlan->msti == msti) {
|
|
*state = v->state;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
EXPORT_SYMBOL_GPL(br_mst_get_state);
|
|
|
|
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 switchdev_attr attr = {
|
|
.id = SWITCHDEV_ATTR_ID_PORT_MST_STATE,
|
|
.orig_dev = p->dev,
|
|
.u.mst_state = {
|
|
.msti = msti,
|
|
.state = state,
|
|
},
|
|
};
|
|
struct net_bridge_vlan_group *vg;
|
|
struct net_bridge_vlan *v;
|
|
int err;
|
|
|
|
vg = nbp_vlan_group(p);
|
|
if (!vg)
|
|
return 0;
|
|
|
|
/* MSTI 0 (CST) state changes are notified via the regular
|
|
* SWITCHDEV_ATTR_ID_PORT_STP_STATE.
|
|
*/
|
|
if (msti) {
|
|
err = switchdev_port_attr_set(p->dev, &attr, extack);
|
|
if (err && err != -EOPNOTSUPP)
|
|
return err;
|
|
}
|
|
|
|
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 switchdev_attr attr = {
|
|
.id = SWITCHDEV_ATTR_ID_VLAN_MSTI,
|
|
.orig_dev = mv->br->dev,
|
|
.u.vlan_msti = {
|
|
.vid = mv->vid,
|
|
.msti = msti,
|
|
},
|
|
};
|
|
struct net_bridge_vlan_group *vg;
|
|
struct net_bridge_vlan *pv;
|
|
struct net_bridge_port *p;
|
|
int err;
|
|
|
|
if (mv->msti == msti)
|
|
return 0;
|
|
|
|
err = switchdev_port_attr_set(mv->br->dev, &attr, NULL);
|
|
if (err && err != -EOPNOTSUPP)
|
|
return err;
|
|
|
|
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 switchdev_attr attr = {
|
|
.id = SWITCHDEV_ATTR_ID_BRIDGE_MST,
|
|
.orig_dev = br->dev,
|
|
.u.mst = on,
|
|
};
|
|
struct net_bridge_vlan_group *vg;
|
|
struct net_bridge_port *p;
|
|
int err;
|
|
|
|
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;
|
|
|
|
err = switchdev_port_attr_set(br->dev, &attr, extack);
|
|
if (err && err != -EOPNOTSUPP)
|
|
return err;
|
|
|
|
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;
|
|
}
|
|
|
|
size_t br_mst_info_size(const struct net_bridge_vlan_group *vg)
|
|
{
|
|
DECLARE_BITMAP(seen, VLAN_N_VID) = { 0 };
|
|
const struct net_bridge_vlan *v;
|
|
size_t sz;
|
|
|
|
/* IFLA_BRIDGE_MST */
|
|
sz = nla_total_size(0);
|
|
|
|
list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
|
|
if (test_bit(v->brvlan->msti, seen))
|
|
continue;
|
|
|
|
/* IFLA_BRIDGE_MST_ENTRY */
|
|
sz += nla_total_size(0) +
|
|
/* IFLA_BRIDGE_MST_ENTRY_MSTI */
|
|
nla_total_size(sizeof(u16)) +
|
|
/* IFLA_BRIDGE_MST_ENTRY_STATE */
|
|
nla_total_size(sizeof(u8));
|
|
|
|
__set_bit(v->brvlan->msti, seen);
|
|
}
|
|
|
|
return sz;
|
|
}
|
|
|
|
int br_mst_fill_info(struct sk_buff *skb,
|
|
const struct net_bridge_vlan_group *vg)
|
|
{
|
|
DECLARE_BITMAP(seen, VLAN_N_VID) = { 0 };
|
|
const struct net_bridge_vlan *v;
|
|
struct nlattr *nest;
|
|
int err = 0;
|
|
|
|
list_for_each_entry(v, &vg->vlan_list, vlist) {
|
|
if (test_bit(v->brvlan->msti, seen))
|
|
continue;
|
|
|
|
nest = nla_nest_start_noflag(skb, IFLA_BRIDGE_MST_ENTRY);
|
|
if (!nest ||
|
|
nla_put_u16(skb, IFLA_BRIDGE_MST_ENTRY_MSTI, v->brvlan->msti) ||
|
|
nla_put_u8(skb, IFLA_BRIDGE_MST_ENTRY_STATE, v->state)) {
|
|
err = -EMSGSIZE;
|
|
break;
|
|
}
|
|
nla_nest_end(skb, nest);
|
|
|
|
__set_bit(v->brvlan->msti, seen);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct nla_policy br_mst_nl_policy[IFLA_BRIDGE_MST_ENTRY_MAX + 1] = {
|
|
[IFLA_BRIDGE_MST_ENTRY_MSTI] = NLA_POLICY_RANGE(NLA_U16,
|
|
1, /* 0 reserved for CST */
|
|
VLAN_N_VID - 1),
|
|
[IFLA_BRIDGE_MST_ENTRY_STATE] = NLA_POLICY_RANGE(NLA_U8,
|
|
BR_STATE_DISABLED,
|
|
BR_STATE_BLOCKING),
|
|
};
|
|
|
|
static int br_mst_process_one(struct net_bridge_port *p,
|
|
const struct nlattr *attr,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[IFLA_BRIDGE_MST_ENTRY_MAX + 1];
|
|
u16 msti;
|
|
u8 state;
|
|
int err;
|
|
|
|
err = nla_parse_nested(tb, IFLA_BRIDGE_MST_ENTRY_MAX, attr,
|
|
br_mst_nl_policy, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!tb[IFLA_BRIDGE_MST_ENTRY_MSTI]) {
|
|
NL_SET_ERR_MSG_MOD(extack, "MSTI not specified");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!tb[IFLA_BRIDGE_MST_ENTRY_STATE]) {
|
|
NL_SET_ERR_MSG_MOD(extack, "State not specified");
|
|
return -EINVAL;
|
|
}
|
|
|
|
msti = nla_get_u16(tb[IFLA_BRIDGE_MST_ENTRY_MSTI]);
|
|
state = nla_get_u8(tb[IFLA_BRIDGE_MST_ENTRY_STATE]);
|
|
|
|
return br_mst_set_state(p, msti, state, extack);
|
|
}
|
|
|
|
int br_mst_process(struct net_bridge_port *p, const struct nlattr *mst_attr,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *attr;
|
|
int err, msts = 0;
|
|
int rem;
|
|
|
|
if (!br_opt_get(p->br, BROPT_MST_ENABLED)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Can't modify MST state when MST is disabled");
|
|
return -EBUSY;
|
|
}
|
|
|
|
nla_for_each_nested(attr, mst_attr, rem) {
|
|
switch (nla_type(attr)) {
|
|
case IFLA_BRIDGE_MST_ENTRY:
|
|
err = br_mst_process_one(p, attr, extack);
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
msts++;
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
if (!msts) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Found no MST entries to process");
|
|
err = -EINVAL;
|
|
}
|
|
|
|
return err;
|
|
}
|