RADIUS attribute from rfc7268


WLAN-Reason-Code

The WLAN-Reason-Code Attribute contains information on the reason
      why a Station has been refused network access and has been
      disassociated or de-authenticated.  This can occur due to policy
      or for reasons related to the user's subscription.

      A WLAN-Reason-Code Attribute MAY be included within an Access-
      Reject or Disconnect-Request packet, as well as within an
      Accounting-Request packet.  Upon receipt of an Access-Reject or
      Disconnect-Request packet containing a WLAN-Reason-Code Attribute,
      the WLAN-Reason-Code value is copied by the Access Point into the
      Reason Code field of a Disassociation or Deauthentication frame
      (see Clauses 8.3.3.4 and 8.3.3.12, respectively, in
      ), which is subsequently transmitted to the Station.

      A summary of the WLAN-Reason-Code Attribute format is shown below.
      The fields are transmitted from left to right.

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Type      |  Length       |             Value
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                 Value                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      185

   Length

      6

   Value

      The Value field is four octets, containing a 32-bit unsigned
      integer.  The two most significant octets MUST be set to zero by
      the sender and are ignored by the receiver; the two least
      significant octets contain the Reason Code values defined in Table
      8-36 of Section 8.4.1.7 of .0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            Reserved           |          Reason Code          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+