diff options
Diffstat (limited to 'drivers/vlan_mon/vlan_mon.c')
| -rw-r--r-- | drivers/vlan_mon/vlan_mon.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/vlan_mon/vlan_mon.c b/drivers/vlan_mon/vlan_mon.c index 16bb11e..9a2d211 100644 --- a/drivers/vlan_mon/vlan_mon.c +++ b/drivers/vlan_mon/vlan_mon.c @@ -490,6 +490,36 @@ static int vlan_mon_nl_cmd_del_vlan_mon(struct sk_buff *skb, struct genl_info *i return 0; } +static int vlan_mon_nl_cmd_check_busy(struct sk_buff *skb, struct genl_info *info) +{ + int ifindex, vid; + struct net_device *dev; + int ret = 0; + + if (!info->attrs[VLAN_MON_ATTR_IFINDEX] || !info->attrs[VLAN_MON_ATTR_VID]) + return -EINVAL; + + ifindex = nla_get_u32(info->attrs[VLAN_MON_ATTR_IFINDEX]); + vid = nla_get_u16(info->attrs[VLAN_MON_ATTR_VID]); + + down(&vlan_mon_lock); + + rtnl_lock(); + dev = __dev_get_by_index(&init_net, ifindex); + if (dev) { + struct vlan_dev *d = dev->ml_priv; + if (d) { + if (d->busy[vid / (8*sizeof(long))] & (1lu << (vid % (8*sizeof(long))))) + ret = -EBUSY; + } + } + rtnl_unlock(); + + up(&vlan_mon_lock); + + return ret; +} + static struct nla_policy vlan_mon_nl_policy[VLAN_MON_ATTR_MAX + 1] = { [VLAN_MON_ATTR_NONE] = { .type = NLA_UNSPEC, }, [VLAN_MON_ATTR_VLAN_MASK] = { .type = NLA_BINARY, .len = 4096/8 }, @@ -523,6 +553,12 @@ static struct genl_ops vlan_mon_nl_ops[] = { .policy = vlan_mon_nl_policy, .flags = GENL_ADMIN_PERM, }, + { + .cmd = VLAN_MON_CMD_CHECK_BUSY, + .doit = vlan_mon_nl_cmd_check_busy, + .policy = vlan_mon_nl_policy, + .flags = GENL_ADMIN_PERM, + }, }; static struct genl_family vlan_mon_nl_family = { |