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Date: Tue, 10 Sep 2013 10:22:26 -0400
From: Vlad Yasevich <vyasevic@...hat.com>
To: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
CC: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net 1/4] bridge: Don't use VID 0 and 4095 in vlan filtering
On 09/10/2013 06:32 AM, Toshiaki Makita wrote:
> IEEE 802.1Q says that:
> - VID 0 shall not be configured as a PVID, or configured in any Filtering
> Database entry.
> - VID 4095 shall not be configured as a PVID, or transmitted in a tag
> header. This VID value may be used to indicate a wildcard match for the VID
> in management operations or Filtering Database entries.
> (See IEEE 802.1Q-2005 6.7.1 and Table 9-2)
>
> Don't accept adding these VIDs in the vlan_filtering implementation.
>
> Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Reviewed-by: Vlad Yasevich <vyasevich@...hat.com>
-vlad
> ---
> net/bridge/br_fdb.c | 4 +-
> net/bridge/br_netlink.c | 2 +-
> net/bridge/br_vlan.c | 97 +++++++++++++++++++++++--------------------------
> 3 files changed, 49 insertions(+), 54 deletions(-)
>
> diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
> index ffd5874..33e8f23 100644
> --- a/net/bridge/br_fdb.c
> +++ b/net/bridge/br_fdb.c
> @@ -700,7 +700,7 @@ int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
>
> vid = nla_get_u16(tb[NDA_VLAN]);
>
> - if (vid >= VLAN_N_VID) {
> + if (!vid || vid >= VLAN_VID_MASK) {
> pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
> vid);
> return -EINVAL;
> @@ -794,7 +794,7 @@ int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
>
> vid = nla_get_u16(tb[NDA_VLAN]);
>
> - if (vid >= VLAN_N_VID) {
> + if (!vid || vid >= VLAN_VID_MASK) {
> pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
> vid);
> return -EINVAL;
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index b9259ef..9bac61e 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -243,7 +243,7 @@ static int br_afspec(struct net_bridge *br,
>
> vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
>
> - if (vinfo->vid >= VLAN_N_VID)
> + if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
> return -EINVAL;
>
> switch (cmd) {
> diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
> index 9a9ffe7..21b6d21 100644
> --- a/net/bridge/br_vlan.c
> +++ b/net/bridge/br_vlan.c
> @@ -45,37 +45,34 @@ static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
> return 0;
> }
>
> - if (vid) {
> - if (v->port_idx) {
> - p = v->parent.port;
> - br = p->br;
> - dev = p->dev;
> - } else {
> - br = v->parent.br;
> - dev = br->dev;
> - }
> - ops = dev->netdev_ops;
> -
> - if (p && (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
> - /* 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.
> - */
> - err = ops->ndo_vlan_rx_add_vid(dev, htons(ETH_P_8021Q),
> - vid);
> - if (err)
> - return err;
> - }
> -
> - err = br_fdb_insert(br, p, dev->dev_addr, vid);
> - if (err) {
> - br_err(br, "failed insert local address into bridge "
> - "forwarding table\n");
> - goto out_filt;
> - }
> + if (v->port_idx) {
> + p = v->parent.port;
> + br = p->br;
> + dev = p->dev;
> + } else {
> + br = v->parent.br;
> + dev = br->dev;
> + }
> + ops = dev->netdev_ops;
> +
> + if (p && (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
> + /* 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.
> + */
> + err = ops->ndo_vlan_rx_add_vid(dev, htons(ETH_P_8021Q),
> + vid);
> + if (err)
> + return err;
> + }
>
> + err = br_fdb_insert(br, p, dev->dev_addr, vid);
> + if (err) {
> + br_err(br, "failed insert local address into bridge "
> + "forwarding table\n");
> + goto out_filt;
> }
>
> set_bit(vid, v->vlan_bitmap);
> @@ -98,7 +95,7 @@ static int __vlan_del(struct net_port_vlans *v, u16 vid)
> __vlan_delete_pvid(v, vid);
> clear_bit(vid, v->untagged_bitmap);
>
> - if (v->port_idx && vid) {
> + if (v->port_idx) {
> struct net_device *dev = v->parent.port->dev;
> const struct net_device_ops *ops = dev->netdev_ops;
>
> @@ -248,7 +245,9 @@ bool br_allowed_egress(struct net_bridge *br,
> return false;
> }
>
> -/* Must be protected by RTNL */
> +/* Must be protected by RTNL.
> + * Must be called with vid in range from 1 to 4094 inclusive.
> + */
> int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
> {
> struct net_port_vlans *pv = NULL;
> @@ -278,7 +277,9 @@ out:
> return err;
> }
>
> -/* Must be protected by RTNL */
> +/* Must be protected by RTNL.
> + * Must be called with vid in range from 1 to 4094 inclusive.
> + */
> int br_vlan_delete(struct net_bridge *br, u16 vid)
> {
> struct net_port_vlans *pv;
> @@ -289,14 +290,9 @@ int br_vlan_delete(struct net_bridge *br, u16 vid)
> if (!pv)
> return -EINVAL;
>
> - if (vid) {
> - /* If the VID !=0 remove fdb for this vid. VID 0 is special
> - * in that it's the default and is always there in the fdb.
> - */
> - spin_lock_bh(&br->hash_lock);
> - fdb_delete_by_addr(br, br->dev->dev_addr, vid);
> - spin_unlock_bh(&br->hash_lock);
> - }
> + spin_lock_bh(&br->hash_lock);
> + fdb_delete_by_addr(br, br->dev->dev_addr, vid);
> + spin_unlock_bh(&br->hash_lock);
>
> __vlan_del(pv, vid);
> return 0;
> @@ -329,7 +325,9 @@ unlock:
> return 0;
> }
>
> -/* Must be protected by RTNL */
> +/* Must be protected by RTNL.
> + * Must be called with vid in range from 1 to 4094 inclusive.
> + */
> int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
> {
> struct net_port_vlans *pv = NULL;
> @@ -363,7 +361,9 @@ clean_up:
> return err;
> }
>
> -/* Must be protected by RTNL */
> +/* Must be protected by RTNL.
> + * Must be called with vid in range from 1 to 4094 inclusive.
> + */
> int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
> {
> struct net_port_vlans *pv;
> @@ -374,14 +374,9 @@ int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
> if (!pv)
> return -EINVAL;
>
> - if (vid) {
> - /* If the VID !=0 remove fdb for this vid. VID 0 is special
> - * in that it's the default and is always there in the fdb.
> - */
> - spin_lock_bh(&port->br->hash_lock);
> - fdb_delete_by_addr(port->br, port->dev->dev_addr, vid);
> - spin_unlock_bh(&port->br->hash_lock);
> - }
> + spin_lock_bh(&port->br->hash_lock);
> + fdb_delete_by_addr(port->br, port->dev->dev_addr, vid);
> + spin_unlock_bh(&port->br->hash_lock);
>
> return __vlan_del(pv, vid);
> }
>
--
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