diff options
Diffstat (limited to 'net/bridge/br_vlan.c')
| -rw-r--r-- | net/bridge/br_vlan.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c new file mode 100644 index 000000000000..209464ef5242 --- /dev/null +++ b/net/bridge/br_vlan.c @@ -0,0 +1,199 @@ +#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); +} + +/* 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); +} |