typedef enum { ... } SilcPacketError

    Packet errors.  This is returned in the error callback.  If application
    needs the actual lower level stream error, it needs to retrieve it
    from the actual stream.  It can retrieve the underlaying stream from
    the packet stream by calling silc_packet_stream_get_stream function.

    You may retrieve string version of the SilcPacketError by calling
    silc_packet_error_string.

    typedef enum {
      SILC_PACKET_ERR_READ,                  /* Error while reading */
      SILC_PACKET_ERR_WRITE,                 /* Error while writing */
      SILC_PACKET_ERR_MAC_FAILED,            /* Packet MAC check failed */
      SILC_PACKET_ERR_DECRYPTION_FAILED,     /* Packet decryption failed */
      SILC_PACKET_ERR_UNKNOWN_SID,           /* Unknown SID (with IV included) */
      SILC_PACKET_ERR_MALFORMED,             /* Packet is malformed */
      SILC_PACKET_ERR_NO_MEMORY,             /* System out of memory */
    } SilcPacketError;