191 lines
4.2 KiB
HTML
191 lines
4.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of CRDA</TITLE>
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</HEAD><BODY>
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<H1>CRDA</H1>
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Section: Linux (8)<BR>Updated: 23 January 2009<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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crda - send to the kernel a wireless regulatory domain for a given ISO / IEC 3166 alpha2
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<P>
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<BR>
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<B>crda</B>
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<P>
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<BR>
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<P>
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<A NAME="lbAE"> </A>
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<H3><A NAME="lbAF"> </A>
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<H2>Description</H2>
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</H3>
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<B>crda</B>
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is the Linux wireless central regulatory domain agent.
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<B>crda</B>
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is intended to be used by
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<B>udev</B>
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scripts and should not be run manually unless debugging udev
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scripts.
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<B>crda</B>
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is triggered to run by the kernel by sending a
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<B>udev</B>
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event upon a new regulatory domain change. Regulatory domain
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changes are triggered by the wireless kernel subsystem (upon initialization
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and on reception of country IEs), wireless drivers, or
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userspace (see
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<B>iw</B>
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). Upon a regulatory domain change the kernel sends a udev change event
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for the regulatory platform. The kernel ignores regulatory domains sent
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to it if it does not expect them. The regulatory domain is read by crda
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from the
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<B>regulatory.bin</B>
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file.
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<P>
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<A NAME="lbAH"> </A>
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<H3><A NAME="lbAI"> </A>
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<H2>RSA Digital Signature</H2>
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</H3>
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If built with openssl or gcrypt support
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<B>crda</B>
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will have embedded
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into it an RSA digital signature which will prevent it from reading
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corrupted or non-authored
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<B>regulatory.bin</B>
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files. Authorship is respected by the RSA public key packed into
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<B>crda.</B>
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<I>This</I>
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specific
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<B>crda</B>
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package has been built with RSA public keys from
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<I>John Linville (the Linux wireless kernel maintainer)</I>
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and
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<I>Seth Forshee (the wireless regulatory databse maintainer)</I>
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and as such will only read
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<B>regulatory.bin</B>
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files signed by one of them. For further information see the
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<B>regulatory.bin</B>
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man page.
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<P>
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<A NAME="lbAK"> </A>
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<H3><A NAME="lbAL"> </A>
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<H2>UDEV RULE</H2>
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</H3>
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A udev regulatory rule must be put in place
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in order to receive and parse udev events from the kernel in order to get
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udev to call crda with the passed ISO / IEC 3166 alpha2 country code.
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An example udev rule which can be used (usually in
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<B>/lib/udev/rules.d/85-regulatory.rules</B>
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):
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<P>
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<I>KERNEL==regulatory*, ACTION==change, SUBSYSTEM==platform, RUN+=/sbin/crda</I>
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<P>
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<A NAME="lbAN"> </A>
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<H3><A NAME="lbAO"> </A>
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<H2>Environment variable</H2>
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</H3>
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Set the
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<B>COUNTRY</B>
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environment variable with a specific ISO / IEC 3166 alpha2 country code
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and then run
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<B>crda</B>
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without arguments. This will send a regulatory domain for that alpha2
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to the kernel.
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<P>
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<A NAME="lbAP"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?8+iw">iw</A></B>(8)
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<B><A HREF="/cgi-bin/man/man2html?5+regulatory.bin">regulatory.bin</A></B>(5)
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<P>
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<B><A HREF="http://wireless.kernel.org/en/developers/Regulatory/">http://wireless.kernel.org/en/developers/Regulatory/</A></B>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DL>
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</DL>
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<DT id="3"><A HREF="#lbAE">Description</A><DD>
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<DT id="4"><A HREF="#lbAE"><A NAME="lbAE"> </A>
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<H2>Description</H2>
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</A><DD>
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<DT id="5"><A HREF="#lbAF">Description</A><DD>
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<DL>
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</DL>
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<DT id="6"><A HREF="#lbAH">RSA Digital Signature</A><DD>
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<DT id="7"><A HREF="#lbAH"><A NAME="lbAH"> </A>
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<H2>RSA Digital Signature</H2>
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</A><DD>
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<DT id="8"><A HREF="#lbAI">RSA Digital Signature</A><DD>
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<DL>
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</DL>
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<DT id="9"><A HREF="#lbAK">UDEV RULE</A><DD>
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<DT id="10"><A HREF="#lbAK"><A NAME="lbAK"> </A>
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<H2>UDEV RULE</H2>
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</A><DD>
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<DT id="11"><A HREF="#lbAL">UDEV RULE</A><DD>
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<DL>
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</DL>
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<DT id="12"><A HREF="#lbAN">Environment variable</A><DD>
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<DT id="13"><A HREF="#lbAN"><A NAME="lbAN"> </A>
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<H2>Environment variable</H2>
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</A><DD>
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<DT id="14"><A HREF="#lbAO">Environment variable</A><DD>
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<DT id="15"><A HREF="#lbAP">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:11 GMT, March 31, 2021
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</BODY>
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</HTML>
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