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// SPDX-License-Identifier: GPL-2.0-only
// Copyright (c) 2020, Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include "br_private.h"
/* check if the options' state of v_curr allow it to enter the range */
bool br_vlan_opts_eq_range(const struct net_bridge_vlan *v_curr,
const struct net_bridge_vlan *range_end)
{
return v_curr->state == range_end->state;
}
bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v)
{
return !nla_put_u8(skb, BRIDGE_VLANDB_ENTRY_STATE,
br_vlan_get_state(v));
}
size_t br_vlan_opts_nl_size(void)
{
return nla_total_size(sizeof(u8)); /* BRIDGE_VLANDB_ENTRY_STATE */
}
static int br_vlan_modify_state(struct net_bridge_vlan_group *vg,
struct net_bridge_vlan *v,
u8 state,
bool *changed,
struct netlink_ext_ack *extack)
{
struct net_bridge *br;
ASSERT_RTNL();
if (state > BR_STATE_BLOCKING) {
NL_SET_ERR_MSG_MOD(extack, "Invalid vlan state");
return -EINVAL;
}
if (br_vlan_is_brentry(v))
br = v->br;
else
br = v->port->br;
if (br->stp_enabled == BR_KERNEL_STP) {
NL_SET_ERR_MSG_MOD(extack, "Can't modify vlan state when using kernel STP");
return -EBUSY;
}
if (v->state == state)
return 0;
if (v->vid == br_get_pvid(vg))
br_vlan_set_pvid_state(vg, state);
br_vlan_set_state(v, state);
*changed = true;
return 0;
}
static int br_vlan_process_one_opts(const struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_vlan_group *vg,
struct net_bridge_vlan *v,
struct nlattr **tb,
bool *changed,
struct netlink_ext_ack *extack)
{
int err;
*changed = false;
if (tb[BRIDGE_VLANDB_ENTRY_STATE]) {
u8 state = nla_get_u8(tb[BRIDGE_VLANDB_ENTRY_STATE]);
err = br_vlan_modify_state(vg, v, state, changed, extack);
if (err)
return err;
}
return 0;
}
int br_vlan_process_options(const struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_vlan *range_start,
struct net_bridge_vlan *range_end,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct net_bridge_vlan *v, *curr_start = NULL, *curr_end = NULL;
struct net_bridge_vlan_group *vg;
int vid, err = 0;
u16 pvid;
if (p)
vg = nbp_vlan_group(p);
else
vg = br_vlan_group(br);
if (!range_start || !br_vlan_should_use(range_start)) {
NL_SET_ERR_MSG_MOD(extack, "Vlan range start doesn't exist, can't process options");
return -ENOENT;
}
if (!range_end || !br_vlan_should_use(range_end)) {
NL_SET_ERR_MSG_MOD(extack, "Vlan range end doesn't exist, can't process options");
return -ENOENT;
}
pvid = br_get_pvid(vg);
for (vid = range_start->vid; vid <= range_end->vid; vid++) {
bool changed = false;
v = br_vlan_find(vg, vid);
if (!v || !br_vlan_should_use(v)) {
NL_SET_ERR_MSG_MOD(extack, "Vlan in range doesn't exist, can't process options");
err = -ENOENT;
break;
}
err = br_vlan_process_one_opts(br, p, vg, v, tb, &changed,
extack);
if (err)
break;
if (changed) {
/* vlan options changed, check for range */
if (!curr_start) {
curr_start = v;
curr_end = v;
continue;
}
if (v->vid == pvid ||
!br_vlan_can_enter_range(v, curr_end)) {
br_vlan_notify(br, p, curr_start->vid,
curr_end->vid, RTM_NEWVLAN);
curr_start = v;
}
curr_end = v;
} else {
/* nothing changed and nothing to notify yet */
if (!curr_start)
continue;
br_vlan_notify(br, p, curr_start->vid, curr_end->vid,
RTM_NEWVLAN);
curr_start = NULL;
curr_end = NULL;
}
}
if (curr_start)
br_vlan_notify(br, p, curr_start->vid, curr_end->vid,
RTM_NEWVLAN);
return err;
}
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