Home
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
OS Components & Operations
High-Performance Networking Stack (io-sock) User's Guide
This guide contains instructions for implementing and using the QNX OS High-Performance Networking Stack and its manager, io-sock.
Packet Filtering

QNX Momentics IDE User's Guide
This User's Guide describes version 8.0 of the Integrated Development Environment (IDE) that's part of the QNX Tool Suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
- Quickstart Guide
- System Architecture
  The System Architecture guide accompanies the QNX OS and is intended for both application developers and end-users.
- OS Components & Operations
  - Boot Optimization Guide
    The Boot Optimization Guide describes techniques you can use to reduce the time from your board's initial power on until you have a fully functional QNX system running on the board.
  - Building Embedded Systems
    The Building Embedded Systems guide is intended for developers who are developing or building BSPs for QNX OS embedded systems.
  - Customizing a BSP
    While QNX provides Board Support Packages (BSPs) for many common platforms and their individual variants, in some cases, you need a BSP for a board that QNX does not provide. If this is the case, you can modify a QNX BSP or develop your own.
  - Device Publishers Developer's Guide
  - High Availability Framework Developer's Guide
  - High-Performance Networking Stack (io-sock) User's Guide
    This guide contains instructions for implementing and using the QNX OS High-Performance Networking Stack and its manager, io-sock.
    - Overview
    - Privilege Control
      Like other components that run on QNX OS, the privileged operations required by io-sock and networking components are protected by process manager abilities. These abilities are configured either directly by the components themselves, or, preferably, via security policies that are defined by the system integrator.
    - Packet Filtering
    - Starting io-sock and Driver Management
    - Running io-sock with Diagnostic Features
    - Networking Services
      The io-sock networking stack provides services ported from FreeBSD.
    - Protocols
      The io-sock networking stack provides Internet protocols ported from FreeBSD.
    - Networking APIs
    - Networking Utilities
    - Writing Network Drivers for io-sock
    - A Hardware-Independent Sample Driver
    - Adding PTP to io-sock Network Drivers
      This appendix describes how to add 2-Step Precision Time Protocol (PTP) Ethernet packet timestamping functionality to an io-sock driver.
    - PTP Module Library API
      These PTP module functions are implemented by the PTP module. Networking drivers use them to handle actions such as transmit (Tx) and receive (Rx) timestamping and handing off PTP I/O-command (ioctl()) command processing.
  - PCI Server User's Guide
  - Performance Tuning User's Guide
  - SMMUMAN User's Guide
  - System Analysis Toolkit (SAT) User's Guide
  - Technotes
  - User's Guide
    The QNX OS User's Guide is intended for all users of a QNX OS system, from system administrators to end users.
- Graphics
- Programming
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX OS system and developers who want to create a QNX OS resource manager free from vulnerabilities.
- Utilities & Libraries
- Migrating to QNX OS 8.0
QNX Software in the Cloud
QNX Toolkit for Visual Studio Code
This User's Guide describes the QNX^® Toolkit for Visual Studio Code. The guide introduces you to the QNX Toolkit by explaining the QNX development environment and how to build, run, and debug your QNX^® Operating System (OS) applications and systems.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation, explains how to obtain technical support, and provides some information about licensing.

Packet Filtering

QNX SDP8.0High-Performance Networking Stack (io-sock) User's GuideAPIArchitecture

QNX OS uses the FreeBSD implementation of packet filtering (PF). See the FreeBSD documentation for information about the following io-sock packet filtering components:

Instructions that provide general information about FreeBSD packet filtering also apply to using the feature with io-sock, with some exceptions. For example, the following documentation is available:

QNX has extended bpf to support multi-packet writes. For more information, go to the bpf entry in the Utilities Reference.

Loading PF

Some operating systems that use FreeBSD PF require you to load the PF kernel module to make the feature available. On QNX OS systems, this is not necessary or supported because the PF module is automatically loaded when you start io-sock.

You use pfctl (https://www.freebsd.org/cgi/man.cgi?query=pfctl&sektion=8&manpath=FreeBSD+13.3-RELEASE+and+Ports) to enable and disable PF. For more information, see the pfctl documentation.

Startup configuration and configuration file

QNX OS does not use the /etc/rc.conf file that FreeBSD provides to configure PF.

Instead, you use pfctl with -f file to specify the configuration file (by default, /etc/pf.conf). A sample file is provided at /usr/share/examples/pf/pf.conf. For more information, see https://www.freebsd.org/cgi/man.cgi?query=pf.conf&sektion=5&manpath=FreeBSD+13.3-RELEASE+and+Ports.

Because io-sock starts PF, the io-sock PF configuration file does not need or support the pf_enable entry.

The sysrc utility that FreeBSD provides to edit /etc/rc.conf and other files is not provided or needed for io-sock PF.

Protocol name database

Some packet filtering utilities require a protocol name database on the target. For more information, go to the /etc/protocls entry in the Utilities Reference.

Page updated: August 09, 2024