pan_id = nla_get_le16(info->attrs[NL802154_ATTR_PAN_ID]);
+ /* Only allow changing the PAN ID when the device has no more
+ * associations ongoing to avoid confusing peers.
+ */
+ if (cfg802154_device_is_associated(wpan_dev)) {
+ NL_SET_ERR_MSG(info->extack,
+ "Existing associations, changing PAN ID forbidden");
+ return -EINVAL;
+ }
+
return rdev_set_pan_id(rdev, wpan_dev, pan_id);
}
short_addr = nla_get_le16(info->attrs[NL802154_ATTR_SHORT_ADDR]);
- /* 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.
+ /* The short address only has a meaning when part of a PAN, after a
+ * proper association procedure. However, we want to still offer the
+ * possibility to create static networks so changing the short address
+ * is only allowed when not already associated to other devices with
+ * the official handshake.
*/
- if (short_addr == cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC) ||
- short_addr == cpu_to_le16(IEEE802154_ADDR_SHORT_BROADCAST))
+ if (cfg802154_device_is_associated(wpan_dev)) {
+ NL_SET_ERR_MSG(info->extack,
+ "Existing associations, changing short address forbidden");
return -EINVAL;
+ }
return rdev_set_short_addr(rdev, wpan_dev, short_addr);
}