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net: bridge: mst: Support setting and reporting MST port states

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Make it possible to change the port state in a given MSTI by extending
the bridge port netlink interface (RTM_SETLINK on PF_BRIDGE).The
proposed iproute2 interface would be:

    bridge mst set dev <PORT> msti <MSTI> state <STATE>

Current states in all applicable MSTIs can also be dumped via a
corresponding RTM_GETLINK. The proposed iproute interface looks like
this:

$ bridge mst
port              msti
vb1               0
		    state forwarding
		  100
		    state disabled
vb2               0
		    state forwarding
		  100
		    state forwarding

The preexisting per-VLAN states are still valid in the MST
mode (although they are read-only), and can be queried as usual if one
is interested in knowing a particular VLAN's state without having to
care about the VID to MSTI mapping (in this example VLAN 20 and 30 are
bound to MSTI 100):

$ bridge -d vlan
port              vlan-id
vb1               10
		    state forwarding mcast_router 1
		  20
		    state disabled mcast_router 1
		  30
		    state disabled mcast_router 1
		  40
		    state forwarding mcast_router 1
vb2               10
		    state forwarding mcast_router 1
		  20
		    state forwarding mcast_router 1
		  30
		    state forwarding mcast_router 1
		  40
		    state forwarding mcast_router 1

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 16:08:45 +01:00
committed by Jakub Kicinski
parent 8c678d6056
commit 122c29486e
5 changed files with 209 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

126
net/bridge/br_mst.c
View File

@@ -127,3 +127,129 @@ int br_mst_set_enabled(struct net_bridge *br, bool on,
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;
}