6lowpan: add support for getting short address

In case of sending RA messages we need some way to get the short address
from an 802.15.4 6LoWPAN interface. This patch will add a temporary
debugfs entry for experimental userspace api.

Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <aar@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/6lowpan/debugfs.c b/net/6lowpan/debugfs.c
index acbaa3db493b2085915ab0c2576be778c262ce0f..24915e0bb9ea54e27543a6e86792b58f03a53fb5 100644 (file)
--- a/net/6lowpan/debugfs.c
+++ b/net/6lowpan/debugfs.c
@@ -245,6 +245,41 @@ static const struct file_operations lowpan_context_fops = {
        .release        = single_release,
 };
 
+static int lowpan_short_addr_get(void *data, u64 *val)
+{
+       struct wpan_dev *wdev = data;
+
+       rtnl_lock();
+       *val = le16_to_cpu(wdev->short_addr);
+       rtnl_unlock();
+
+       return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(lowpan_short_addr_fops, lowpan_short_addr_get,
+                       NULL, "0x%04llx\n");
+
+static int lowpan_dev_debugfs_802154_init(const struct net_device *dev,
+                                         struct lowpan_dev *ldev)
+{
+       struct dentry *dentry, *root;
+
+       if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154))
+               return 0;
+
+       root = debugfs_create_dir("ieee802154", ldev->iface_debugfs);
+       if (!root)
+               return -EINVAL;
+
+       dentry = debugfs_create_file("short_addr", 0444, root,
+                                    lowpan_802154_dev(dev)->wdev->ieee802154_ptr,
+                                    &lowpan_short_addr_fops);
+       if (!dentry)
+               return -EINVAL;
+
+       return 0;
+}
+
 int lowpan_dev_debugfs_init(struct net_device *dev)
 {
        struct lowpan_dev *ldev = lowpan_dev(dev);
@@ -272,6 +307,10 @@ int lowpan_dev_debugfs_init(struct net_device *dev)
                        goto remove_root;
        }
 
+       ret = lowpan_dev_debugfs_802154_init(dev, ldev);
+       if (ret < 0)
+               goto remove_root;
+
        return 0;
 
 remove_root: