Exemplo n.º 1
0
/**
 * aniEapolParseKey
 *
 * Parses and verifies a complete EAPOL-Key frame. The key descriptor
 * type is returned and so is a newly allocated key descriptor structure
 * that is appropriate for the type.
 *
 * NOTE: This is a non-destructive read. That is, the packet headers
 * will be unchanged at the end of this read operation. This is so
 * that a followup MIC check may be done on the complete packet. If
 * the packet parsing fails, the packet headers are not guaranteed to
 * be unchanged.
 *
 * @param packet the packet to read from. Note that the frame is not
 * expected to contain any additional padding at the end other than
 * the exact number of key bytes. (The aniEapolParse function will
 * ensure this.)
 * @param descType is set to the key descriptor type
 * (ANI_EAPOL_KEY_DESC_TYPE_LEGACY_RC4 or
 * ANI_EAPOL_KEY_DESC_TYPE_RSN).
 * @param keyDescData is set to a newly allocated key descriptor
 * corresponding to the above descType. The signature field is
 * verified. The key bytes will be returned encrypted. It is the
 * responsibility of the caller to free this structure and the data
 * contained therein.
 *
 * @return ANI_OK if the operation succeeds
 */
int
aniEapolParseKey(tAniPacket *packet,
                 int *descType,
                 void **keyDescData)
{
    int retVal;
    v_U8_t *bytes;
    v_U32_t eapolFrameLen;

    if (packet == NULL)
        return ANI_E_NULL_VALUE;

    do
    {
        eapolFrameLen = aniAsfPacketGetLen(packet);

        VOS_TRACE( VOS_MODULE_ID_BAP, VOS_TRACE_LEVEL_INFO, "Supp parsing EAPOL-Key frame of len %d\n",
                      eapolFrameLen);

        retVal = aniAsfPacketTruncateFromFront(packet, EAPOL_RX_HEADER_SIZE);
        if( !ANI_IS_STATUS_SUCCESS(retVal) ) break;

        retVal = aniAsfPacketGetBytes(packet, &bytes);
        if( !ANI_IS_STATUS_SUCCESS(retVal) ) break;

        if (*bytes == ANI_EAPOL_KEY_DESC_TYPE_RSN ||
                   *bytes == ANI_EAPOL_KEY_DESC_TYPE_RSN_NEW)
        {
            tAniEapolRsnKeyDesc *rsnDesc = NULL;

            //*descType = ANI_EAPOL_KEY_DESC_TYPE_RSN;
            *descType = (*bytes == ANI_EAPOL_KEY_DESC_TYPE_RSN_NEW ?
                 ANI_EAPOL_KEY_DESC_TYPE_RSN_NEW :  ANI_EAPOL_KEY_DESC_TYPE_RSN) ;
            retVal = parseRsnKeyDesc(packet, &rsnDesc);
            if( !ANI_IS_STATUS_SUCCESS(retVal) ) break;
            *keyDescData = rsnDesc;
        }
        else
        {
            VOS_TRACE( VOS_MODULE_ID_BAP, VOS_TRACE_LEVEL_ERROR,
                "Supp received unknown EAPOL-Key descriptor: %d\n",
                        *bytes);
            retVal = ANI_E_ILLEGAL_ARG;
            break;
        }

        aniAsfPacketMoveLeft(packet, eapolFrameLen);
    }while( 0 );

    return retVal;
}
/**
 * aniAsfPacketPrepend8
 *
 * FUNCTION:
 * Prepends a ANI_U8 to the start of the packet.
 * All host to network byte order translation is also taken care of.
 *
 * @param packet the packet to read from
 * @param val the value to prepend
 *
 * @return ANI_OK if the operation succeeds
 */
int
aniAsfPacketPrepend8(tAniPacket *packet, v_U8_t val)
{
    if (packet == NULL)
        return ANI_E_NULL_VALUE;

    VOS_ASSERT(HEAD_SPACE(packet) >= 1);
    if (HEAD_SPACE(packet) < 1)
        return ANI_E_FAILED;

    aniAsfPacketMoveLeft(packet, 1);
    *(packet->head) = val;

    return ANI_OK;
}
/**
 * aniAsfPacketPrepend16
 *
 * FUNCTION:
 * Prepends a ANI_U16 to the start of the packet.
 * All host to network byte order translation is also taken care of.
 *
 * @param packet the packet to write to
 * @param val the value to prepend
 *
 * @return ANI_OK if the operation succeeds
 */
int
aniAsfPacketPrepend16(tAniPacket *packet, v_U16_t val)
{
    v_U8_t *p8;

    if (packet == NULL)
        return ANI_E_NULL_VALUE;

    if (HEAD_SPACE(packet) < 2)
        return ANI_E_FAILED;

    aniAsfPacketMoveLeft(packet, 2);
    val = vos_cpu_to_be16( val );
    p8 = (v_U8_t *)&val;
    packet->head[0] =  p8[0];
    packet->head[1] =  p8[1];

    return ANI_OK;
}