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net: bridge: mst: Allow changing a VLAN's MSTI

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Allow a VLAN to move out of the CST (MSTI 0), to an independent tree.

The user manages the VID to MSTI mappings via a global VLAN
setting. The proposed iproute2 interface would be:

    bridge vlan global set dev br0 vid <VID> msti <MSTI>

Changing the state in non-zero MSTIs is still not supported, but will
be addressed in upcoming changes.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Tobias Waldekranz 2022-03-16 16:08:44 +01:00 committed by Jakub Kicinski
parent ec7328b591
commit 8c678d6056
4 changed files with 59 additions and 0 deletions
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1
include/uapi/linux/if_bridge.h
View file

@ -564,6 +564,7 @@ enum {
BRIDGE_VLANDB_GOPTS_MCAST_QUERIER,
BRIDGE_VLANDB_GOPTS_MCAST_ROUTER_PORTS,
BRIDGE_VLANDB_GOPTS_MCAST_QUERIER_STATE,
BRIDGE_VLANDB_GOPTS_MSTI,
__BRIDGE_VLANDB_GOPTS_MAX
};
#define BRIDGE_VLANDB_GOPTS_MAX (__BRIDGE_VLANDB_GOPTS_MAX - 1)

42
net/bridge/br_mst.c
View file

@ -46,6 +46,48 @@ int br_mst_set_state(struct net_bridge_port *p, u16 msti, u8 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) */

1
net/bridge/br_private.h
View file

@ -1780,6 +1780,7 @@ static inline bool br_mst_is_enabled(struct net_bridge *br)
int br_mst_set_state(struct net_bridge_port *p, u16 msti, u8 state,
struct netlink_ext_ack *extack);
int br_mst_vlan_set_msti(struct net_bridge_vlan *v, u16 msti);
void br_mst_vlan_init_state(struct net_bridge_vlan *v);
int br_mst_set_enabled(struct net_bridge *br, bool on,
struct netlink_ext_ack *extack);

15
net/bridge/br_vlan_options.c
View file

@ -296,6 +296,7 @@ bool br_vlan_global_opts_can_enter_range(const struct net_bridge_vlan *v_curr,
const struct net_bridge_vlan *r_end)
{
return v_curr->vid - r_end->vid == 1 &&
v_curr->msti == r_end->msti &&
((v_curr->priv_flags ^ r_end->priv_flags) &
BR_VLFLAG_GLOBAL_MCAST_ENABLED) == 0 &&
br_multicast_ctx_options_equal(&v_curr->br_mcast_ctx,
@ -384,6 +385,9 @@ bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
#endif
#endif
if (nla_put_u16(skb, BRIDGE_VLANDB_GOPTS_MSTI, v_opts->msti))
goto out_err;
nla_nest_end(skb, nest);
return true;
@ -415,6 +419,7 @@ static size_t rtnl_vlan_global_opts_nlmsg_size(const struct net_bridge_vlan *v)
+ nla_total_size(0) /* BRIDGE_VLANDB_GOPTS_MCAST_ROUTER_PORTS */
+ br_rports_size(&v->br_mcast_ctx) /* BRIDGE_VLANDB_GOPTS_MCAST_ROUTER_PORTS */
#endif
+ nla_total_size(sizeof(u16)) /* BRIDGE_VLANDB_GOPTS_MSTI */
+ nla_total_size(sizeof(u16)); /* BRIDGE_VLANDB_GOPTS_RANGE */
}
@ -564,6 +569,15 @@ static int br_vlan_process_global_one_opts(const struct net_bridge *br,
}
#endif
#endif
if (tb[BRIDGE_VLANDB_GOPTS_MSTI]) {
u16 msti;
msti = nla_get_u16(tb[BRIDGE_VLANDB_GOPTS_MSTI]);
err = br_mst_vlan_set_msti(v, msti);
if (err)
return err;
*changed = true;
}
return 0;
}
@ -583,6 +597,7 @@ static const struct nla_policy br_vlan_db_gpol[BRIDGE_VLANDB_GOPTS_MAX + 1] = {
[BRIDGE_VLANDB_GOPTS_MCAST_QUERIER_INTVL] = { .type = NLA_U64 },
[BRIDGE_VLANDB_GOPTS_MCAST_STARTUP_QUERY_INTVL] = { .type = NLA_U64 },
[BRIDGE_VLANDB_GOPTS_MCAST_QUERY_RESPONSE_INTVL] = { .type = NLA_U64 },
[BRIDGE_VLANDB_GOPTS_MSTI] = NLA_POLICY_MAX(NLA_U16, VLAN_N_VID - 1),
};
int br_vlan_rtm_process_global_options(struct net_device *dev,