ieee820154: add short_addr setting support

This patch adds support for setting short address via nl802154 framework.
Also added a comment because a 0xffff seems to be valid address that we
don't have a short address. This is a valid setting but we need
more checks in upper layers to don't allow this address as source address.
Also the current netlink interface doesn't allow to set the short_addr
to 0xffff. Same for the 0xfffe short address which describes a not
allocated short address.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/net/mac802154/cfg.c b/net/mac802154/cfg.c
index db6e5e981a83..df29976d1321 100644
--- a/net/mac802154/cfg.c
+++ b/net/mac802154/cfg.c
@@ -83,9 +83,35 @@ static int ieee802154_set_pan_id(struct wpan_phy *wpan_phy,
         return 0;
 }
 
+static int
+ieee802154_set_short_addr(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev,
+                          const u16 short_addr)
+{
+        ASSERT_RTNL();
+
+        /* TODO
+         * I am not sure about to check here on broadcast short_addr.
+         * Broadcast is a valid setting, comment from 802.15.4:
+         * A value of 0xfffe indicates that the device has
+         * associated but has not been allocated an address. A
+         * value of 0xffff indicates that the device does not
+         * have a short address.
+         *
+         * I think we should allow to set these settings but
+         * don't allow to allow socket communication with it.
+         */
+        if (short_addr == IEEE802154_ADDR_SHORT_UNSPEC ||
+            short_addr == IEEE802154_ADDR_SHORT_BROADCAST)
+                return -EINVAL;
+
+        wpan_dev->short_addr = cpu_to_le16(short_addr);
+        return 0;
+}
+
 const struct cfg802154_ops mac802154_config_ops = {
         .add_virtual_intf_deprecated = ieee802154_add_iface_deprecated,
         .del_virtual_intf_deprecated = ieee802154_del_iface_deprecated,
         .set_channel = ieee802154_set_channel,
         .set_pan_id = ieee802154_set_pan_id,
+        .set_short_addr = ieee802154_set_short_addr,
 };