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Date: Mon, 09 Jun 2014 20:50:18 -0400
From: Vlad Yasevich <vyasevich@...il.com>
To: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
"David S . Miller" <davem@...emloft.net>,
Stephen Hemminger <stephen@...workplumber.org>
CC: netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net-next 4/4] bridge: Support 802.1ad vlan filtering
On 06/09/2014 07:34 AM, Toshiaki Makita wrote:
> This enables us to change the vlan protocol for vlan filtering.
> We come to be able to filter frames on the basis of 802.1ad vlan tags
> through a bridge.
>
> This also changes br->group_addr if it has not been set by user.
> This is needed for an 802.1ad bridge.
> (See IEEE 802.1Q-2011 8.13.5.)
>
> To change the vlan protocol, write a protocol in sysfs:
> # echo 0x88a8 > /sys/class/net/br0/bridge/vlan_protocol
>
> Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
> ---
> net/bridge/br_private.h | 2 ++
> net/bridge/br_sysfs_br.c | 18 +++++++++++
> net/bridge/br_vlan.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 101 insertions(+)
>
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index 65204c2..3c5b23b 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -246,6 +246,7 @@ struct net_bridge
> unsigned long bridge_forward_delay;
>
> u8 group_addr[ETH_ALEN];
> + unsigned char group_addr_set;
nit: can be bool since you just use true/false.
-vlad
> u16 root_port;
>
> enum {
> @@ -599,6 +600,7 @@ int br_vlan_delete(struct net_bridge *br, u16 vid);
> void br_vlan_flush(struct net_bridge *br);
> bool br_vlan_find(struct net_bridge *br, u16 vid);
> int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
> +int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
> void br_vlan_init(struct net_bridge *br);
> int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
> int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
> diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
> index 8dac6555..1831018 100644
> --- a/net/bridge/br_sysfs_br.c
> +++ b/net/bridge/br_sysfs_br.c
> @@ -315,6 +315,7 @@ static ssize_t group_addr_store(struct device *d,
> spin_lock_bh(&br->lock);
> for (i = 0; i < 6; i++)
> br->group_addr[i] = new_addr[i];
> + br->group_addr_set = 1;
> spin_unlock_bh(&br->lock);
> return len;
> }
> @@ -700,6 +701,22 @@ static ssize_t vlan_filtering_store(struct device *d,
> return store_bridge_parm(d, buf, len, br_vlan_filter_toggle);
> }
> static DEVICE_ATTR_RW(vlan_filtering);
> +
> +static ssize_t vlan_protocol_show(struct device *d,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct net_bridge *br = to_bridge(d);
> + return sprintf(buf, "%#06x\n", ntohs(br->vlan_proto));
> +}
> +
> +static ssize_t vlan_protocol_store(struct device *d,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + return store_bridge_parm(d, buf, len, br_vlan_set_proto);
> +}
> +static DEVICE_ATTR_RW(vlan_protocol);
> #endif
>
> static struct attribute *bridge_attrs[] = {
> @@ -745,6 +762,7 @@ static struct attribute *bridge_attrs[] = {
> #endif
> #ifdef CONFIG_BRIDGE_VLAN_FILTERING
> &dev_attr_vlan_filtering.attr,
> + &dev_attr_vlan_protocol.attr,
> #endif
> NULL
> };
> diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
> index 63bd981..c86a7a6 100644
> --- a/net/bridge/br_vlan.c
> +++ b/net/bridge/br_vlan.c
> @@ -394,6 +394,87 @@ unlock:
> return 0;
> }
>
> +int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
> +{
> + int err = 0;
> + struct net_bridge_port *p;
> + struct net_port_vlans *pv;
> + __be16 proto, oldproto;
> + u16 vid, errvid;
> +
> + if (val != ETH_P_8021Q && val != ETH_P_8021AD)
> + return -EPROTONOSUPPORT;
> +
> + if (!rtnl_trylock())
> + return restart_syscall();
> +
> + proto = htons(val);
> + if (br->vlan_proto == proto)
> + goto unlock;
> +
> + /* Add VLANs for the new proto to the device filter. */
> + list_for_each_entry(p, &br->port_list, list) {
> + pv = rtnl_dereference(p->vlan_info);
> + if (!pv)
> + continue;
> +
> + for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
> + err = vlan_vid_add(p->dev, proto, vid);
> + if (err)
> + goto err_filt;
> + }
> + }
> +
> + spin_lock_bh(&br->lock);
> + if (!br->group_addr_set) {
> + switch (val) {
> + case ETH_P_8021Q:
> + /* Bridge Group Address */
> + br->group_addr[5] = 0x00;
> + break;
> +
> + case ETH_P_8021AD:
> + /* Provider Bridge Group Address */
> + br->group_addr[5] = 0x08;
> + break;
> + }
> + }
> + spin_unlock_bh(&br->lock);
> +
> + oldproto = br->vlan_proto;
> + br->vlan_proto = proto;
> +
> + /* Delete VLANs for the old proto from the device filter. */
> + list_for_each_entry(p, &br->port_list, list) {
> + pv = rtnl_dereference(p->vlan_info);
> + if (!pv)
> + continue;
> +
> + for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
> + vlan_vid_del(p->dev, oldproto, vid);
> + }
> +
> +unlock:
> + rtnl_unlock();
> + return err;
> +
> +err_filt:
> + errvid = vid;
> + for_each_set_bit(vid, pv->vlan_bitmap, errvid)
> + vlan_vid_del(p->dev, proto, vid);
> +
> + list_for_each_entry_continue_reverse(p, &br->port_list, list) {
> + pv = rtnl_dereference(p->vlan_info);
> + if (!pv)
> + continue;
> +
> + for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
> + vlan_vid_del(p->dev, proto, vid);
> + }
> +
> + goto unlock;
> +}
> +
> void br_vlan_init(struct net_bridge *br)
> {
> br->vlan_proto = htons(ETH_P_8021Q);
>
--
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