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bridge: Add a default_pvid sysfs attribute

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This patch allows the user to set and retrieve default_pvid
value.  A new value can only be stored when vlan filtering
is disabled.

Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2014-10-03 11:29:16 -04:00 committed by David S. Miller
parent e885439f37
commit 96a20d9d7f
3 changed files with 48 additions and 0 deletions
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2
net/bridge/br_private.h
View file

@ -299,6 +299,7 @@ struct net_bridge
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
u8 vlan_enabled;
__be16 vlan_proto;
u16 default_pvid;
struct net_port_vlans __rcu *vlan_info;
#endif
};
@ -605,6 +606,7 @@ void br_recalculate_fwd_mask(struct net_bridge *br);
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 br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
void nbp_vlan_flush(struct net_bridge_port *port);

17
net/bridge/br_sysfs_br.c
View file

@ -725,6 +725,22 @@ static ssize_t vlan_protocol_store(struct device *d,
return store_bridge_parm(d, buf, len, br_vlan_set_proto);
}
static DEVICE_ATTR_RW(vlan_protocol);
static ssize_t default_pvid_show(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct net_bridge *br = to_bridge(d);
return sprintf(buf, "%d\n", br->default_pvid);
}
static ssize_t default_pvid_store(struct device *d,
struct device_attribute *attr,
const char *buf, size_t len)
{
return store_bridge_parm(d, buf, len, br_vlan_set_default_pvid);
}
static DEVICE_ATTR_RW(default_pvid);
#endif
static struct attribute *bridge_attrs[] = {
@ -771,6 +787,7 @@ static struct attribute *bridge_attrs[] = {
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
&dev_attr_vlan_filtering.attr,
&dev_attr_vlan_protocol.attr,
&dev_attr_default_pvid.attr,
#endif
NULL
};

29
net/bridge/br_vlan.c
View file

@ -499,9 +499,38 @@ err_filt:
goto unlock;
}
int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
{
u16 pvid = val;
int err = 0;
if (!val || val >= VLAN_VID_MASK)
return -EINVAL;
if (!rtnl_trylock())
return restart_syscall();
if (pvid == br->default_pvid)
goto unlock;
/* Only allow default pvid change when filtering is disabled */
if (br->vlan_enabled) {
pr_info_once("Please disable vlan filtering to change default_pvid\n");
err = -EPERM;
goto unlock;
}
br->default_pvid = pvid;
unlock:
rtnl_unlock();
return err;
}
void br_vlan_init(struct net_bridge *br)
{
br->vlan_proto = htons(ETH_P_8021Q);
br->default_pvid = 1;
}
/* Must be protected by RTNL.