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#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include "br_private.h"
static int __vlan_add(struct net_port_vlans *v, u16 vid)
{
int err;
if (test_bit(vid, v->vlan_bitmap))
return -EEXIST;
if (v->port_idx && vid) {
struct net_device *dev = v->parent.port->dev;
/* Add VLAN to the device filter if it is supported.
* Stricly speaking, this is not necessary now, since devices
* are made promiscuous by the bridge, but if that ever changes
* this code will allow tagged traffic to enter the bridge.
*/
if (dev->features & NETIF_F_HW_VLAN_FILTER) {
err = dev->netdev_ops->ndo_vlan_rx_add_vid(dev, vid);
if (err)
return err;
}
}
set_bit(vid, v->vlan_bitmap);
return 0;
}
static int __vlan_del(struct net_port_vlans *v, u16 vid)
{
if (!test_bit(vid, v->vlan_bitmap))
return -EINVAL;
if (v->port_idx && vid) {
struct net_device *dev = v->parent.port->dev;
if (dev->features & NETIF_F_HW_VLAN_FILTER)
dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, vid);
}
clear_bit(vid, v->vlan_bitmap);
if (bitmap_empty(v->vlan_bitmap, BR_VLAN_BITMAP_LEN)) {
if (v->port_idx)
rcu_assign_pointer(v->parent.port->vlan_info, NULL);
else
rcu_assign_pointer(v->parent.br->vlan_info, NULL);
kfree_rcu(v, rcu);
}
return 0;
}
static void __vlan_flush(struct net_port_vlans *v)
{
bitmap_zero(v->vlan_bitmap, BR_VLAN_BITMAP_LEN);
if (v->port_idx)
rcu_assign_pointer(v->parent.port->vlan_info, NULL);
else
rcu_assign_pointer(v->parent.br->vlan_info, NULL);
kfree_rcu(v, rcu);
}
/* Called under RCU */
bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
struct sk_buff *skb)
{
u16 vid;
/* If VLAN filtering is disabled on the bridge, all packets are
* permitted.
*/
if (!br->vlan_enabled)
return true;
/* If there are no vlan in the permitted list, all packets are
* rejected.
*/
if (!v)
return false;
br_vlan_get_tag(skb, &vid);
if (test_bit(vid, v->vlan_bitmap))
return true;
return false;
}
/* Called under RCU. */
bool br_allowed_egress(struct net_bridge *br,
const struct net_port_vlans *v,
const struct sk_buff *skb)
{
u16 vid;
if (!br->vlan_enabled)
return true;
if (!v)
return false;
br_vlan_get_tag(skb, &vid);
if (test_bit(vid, v->vlan_bitmap))
return true;
return false;
}
/* Must be protected by RTNL */
int br_vlan_add(struct net_bridge *br, u16 vid)
{
struct net_port_vlans *pv = NULL;
int err;
ASSERT_RTNL();
pv = rtnl_dereference(br->vlan_info);
if (pv)
return __vlan_add(pv, vid);
/* Create port vlan infomration
*/
pv = kzalloc(sizeof(*pv), GFP_KERNEL);
if (!pv)
return -ENOMEM;
pv->parent.br = br;
err = __vlan_add(pv, vid);
if (err)
goto out;
rcu_assign_pointer(br->vlan_info, pv);
return 0;
out:
kfree(pv);
return err;
}
/* Must be protected by RTNL */
int br_vlan_delete(struct net_bridge *br, u16 vid)
{
struct net_port_vlans *pv;
ASSERT_RTNL();
pv = rtnl_dereference(br->vlan_info);
if (!pv)
return -EINVAL;
__vlan_del(pv, vid);
return 0;
}
void br_vlan_flush(struct net_bridge *br)
{
struct net_port_vlans *pv;
ASSERT_RTNL();
pv = rtnl_dereference(br->vlan_info);
if (!pv)
return;
__vlan_flush(pv);
}
int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
{
if (!rtnl_trylock())
return restart_syscall();
if (br->vlan_enabled == val)
goto unlock;
br->vlan_enabled = val;
unlock:
rtnl_unlock();
return 0;
}
/* Must be protected by RTNL */
int nbp_vlan_add(struct net_bridge_port *port, u16 vid)
{
struct net_port_vlans *pv = NULL;
int err;
ASSERT_RTNL();
pv = rtnl_dereference(port->vlan_info);
if (pv)
return __vlan_add(pv, vid);
/* Create port vlan infomration
*/
pv = kzalloc(sizeof(*pv), GFP_KERNEL);
if (!pv) {
err = -ENOMEM;
goto clean_up;
}
pv->port_idx = port->port_no;
pv->parent.port = port;
err = __vlan_add(pv, vid);
if (err)
goto clean_up;
rcu_assign_pointer(port->vlan_info, pv);
return 0;
clean_up:
kfree(pv);
return err;
}
/* Must be protected by RTNL */
int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
{
struct net_port_vlans *pv;
ASSERT_RTNL();
pv = rtnl_dereference(port->vlan_info);
if (!pv)
return -EINVAL;
return __vlan_del(pv, vid);
}
void nbp_vlan_flush(struct net_bridge_port *port)
{
struct net_port_vlans *pv;
ASSERT_RTNL();
pv = rtnl_dereference(port->vlan_info);
if (!pv)
return;
__vlan_flush(pv);
}
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