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<PART id="tcpip-freebsd">
<TITLE>FreeBSD TCP/IP Stack port for eCos</TITLE>
<PARTINTRO>
<PARA>	  <productname>TCP/IP Networking for eCos</productname>
          now provides a complete
	  TCP/IP networking stack, 
based on a recent snapshot of the FreeBSD code, released by the
KAME project.
The networking support is
	  fully featured and well tested within the eCos environment.
	</PARA>
</PARTINTRO>

<CHAPTER id="tcpip-freebsd-networking-stack-features">
<TITLE>Networking Stack Features</TITLE>
<PARA>Since this networking package is based on BSD code, it is
very complete and robust.  The eCos implementation includes support
for the following protocols:   </PARA>
<itemizedlist>
<LISTITEM><PARA>IPv4</para></listitem>
<LISTITEM><PARA>UDP</para></listitem>
<LISTITEM><PARA>TCP</para></listitem>
<LISTITEM><PARA>ICMP</para></listitem>
<LISTITEM><PARA>raw packet interface</para></listitem>
<LISTITEM><PARA>Multi-cast addressing</para></listitem>
<LISTITEM><PARA>IPv6 (including UDP, ICP, ICMP)</para></listitem>
</itemizedlist>
<PARA>These additional features are also present in the package,
	but are not supported:</PARA>
<itemizedlist>
<LISTITEM><PARA>Berkeley Packet Filter   </PARA></LISTITEM>
<LISTITEM><PARA>Uni-cast support   </PARA></LISTITEM>
<LISTITEM><PARA>Multi-cast routing   </PARA></LISTITEM>
</itemizedlist>
</CHAPTER>
<CHAPTER id="tcpip-freebsd-stack-port">
<TITLE>Freebsd TCP/IP stack port</TITLE>
<PARA>This document describes how to get started with the Freebsd
TCP/IP network stack. </PARA>
<SECT1 id="tcpip-freebsd-tcpip-targets">
<TITLE>Targets</TITLE>
<PARA>A number of ethernet devices may be supported. The default configuration
supports two instances of the interface by default,
and you will need to write your own driver instantiation code,
and supplemental startup and initialization code,
if you should add additional ones.</PARA>
<PARA>The target for your board will normally be supplied with an
ethernet driver, in which case including the network stack and
generic ethernet driver package to your build will automatically
enable usage of the ethernet device driver.
If your target is not supplied with an ethernet
driver, you will need to use loopback (see
<xref linkend="net-common-loopback-tests">).</PARA>
</SECT1>
<SECT1 id="tcpip-freebsd-building-the-network-stack">
<TITLE><!--<conditionaltext>-->Building the Network Stack</TITLE>
<PARA>Using the <EMPHASIS>Build-&gt;Packages</EMPHASIS> dialog,
add the packages &ldquo;Networking&rdquo;,
&ldquo;Freebsd TCP/IP Stack&rdquo;
and &ldquo;Common Ethernet Support&rdquo;
to your configuration.  Their package names
are CYGPKG_NET, CYGPKG_NET_FREEBSD_STACK and CYGPKG_NET_ETH_DRIVERS
respectively.</PARA>
<para>A short-cut way to do this is by
using the &ldquo;net&rdquo; <emphasis>template</emphasis>
if it is available for your platform.</para>
<PARA>The platform-specific ethernet device driver for your platform
will be added as part of the target selection (in the
<EMPHASIS>Build-&gt;Templates</EMPHASIS> &ldquo;Hardware&rdquo; item),
along with the 
PCI I/O subsystem (if relevent) and the appropriate serial device driver.
</para><para>
For example, the PowerPC MBX target selection adds the package
PKG_NET_QUICC_ETH_DRIVERS,
and the Cirrus Logic EDB7xxx target selection adds the package
CYGPKG_NET_EDB7XXX_ETH_DRIVERS.
After this, eCos and its tests can be built exactly as usual.</PARA>
<NOTE>
<PARA>By default, most of the network tests are not built.  This
is because some of them require manual intervention, i.e. they are
to be run &ldquo;by hand&rdquo;, and are not suitable for
automated testing.  To build the full set of network tests, set
the configuration option CYGPKG_NET_BUILD_TESTS &ldquo;Build
networking tests (demo programs)&rdquo; within &ldquo;Networking
support build options&rdquo;.</PARA>
</NOTE>
</SECT1>
</CHAPTER>
<CHAPTER id="tcpip-freebsd-tcpip-apis">
<TITLE>APIs</TITLE>
<SECT1 id="tcpip-freebsd-standard-networking-api">
<TITLE>Standard networking</TITLE>
<PARA>The APIs for the standard networking calls such as
<FUNCTION>socket()</FUNCTION>, <FUNCTION>recv()</FUNCTION> and so on, are
in header files relative to the top-level
include directory, within the standard subdirectories as conventionally
found in <FILENAME>/usr/include</FILENAME>.  For example:
<PROGRAMLISTING>
 install/include/arpa/tftp.h
 install/include/netinet/tcpip.h
 install/include/sys/socket.h
 install/include/sys/socketvar.h
 install/include/sys/sockio.h
</PROGRAMLISTING>
</PARA>
</SECT1>
<SECT1 id="tcpip-freebsd-enhanced-select">
<TITLE>Enhanced Select()</TITLE>
<PARA>The network stack supports an extension to the standard select
semantics which allows all threads that are waiting to be restarted
even if the select conditions are not satisfied.</PARA>
<PARA>The standard select() API:  </PARA>
<PROGRAMLISTING>int  
<function>select</function>(int nfd,
       fd_set &ast;in, fd_set &ast;out, fd_set &ast;ex,
       struct timeval &ast;tv); </PROGRAMLISTING>
<PARA>does not support the restart.</PARA>
<PARA>The additional API:  </PARA>
<PROGRAMLISTING>int  
<function>cyg_select_with_abort</function>(int nfd,
       fd_set &ast;in, fd_set &ast;out, fd_set &ast;ex,
       struct timeval &ast;tv)
</PROGRAMLISTING>
<PARA>behaves exactly as select() with the additional feature that
a call to</PARA>
<PROGRAMLISTING>
void <function>cyg_select_abort</function>(void)
</PROGRAMLISTING>
<PARA>will cause all threads waiting in any
<function>cyg_select_with_abort()</function> call
to cease waiting and continue execution.</PARA>
</SECT1>
</CHAPTER>

</PART>
