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<section id="linux-wireless-regulatory-documentation">
<h1>Linux wireless regulatory documentation<a class="headerlink" href="#linux-wireless-regulatory-documentation" title="Link to this heading">¶</a></h1>
<p>This document gives a brief review over how the Linux wireless
regulatory infrastructure works.</p>
<p>More up to date information can be obtained at the project’s web page:</p>
<p><a class="reference external" href="https://wireless.wiki.kernel.org/en/developers/Regulatory">https://wireless.wiki.kernel.org/en/developers/Regulatory</a></p>
<section id="keeping-regulatory-domains-in-userspace">
<h2>Keeping regulatory domains in userspace<a class="headerlink" href="#keeping-regulatory-domains-in-userspace" title="Link to this heading">¶</a></h2>
<p>Due to the dynamic nature of regulatory domains we keep them
in userspace and provide a framework for userspace to upload
to the kernel one regulatory domain to be used as the central
core regulatory domain all wireless devices should adhere to.</p>
</section>
<section id="how-to-get-regulatory-domains-to-the-kernel">
<h2>How to get regulatory domains to the kernel<a class="headerlink" href="#how-to-get-regulatory-domains-to-the-kernel" title="Link to this heading">¶</a></h2>
<p>When the regulatory domain is first set up, the kernel will request a
database file (regulatory.db) containing all the regulatory rules. It
will then use that database when it needs to look up the rules for a
given country.</p>
</section>
<section id="how-to-get-regulatory-domains-to-the-kernel-old-crda-solution">
<h2>How to get regulatory domains to the kernel (old CRDA solution)<a class="headerlink" href="#how-to-get-regulatory-domains-to-the-kernel-old-crda-solution" title="Link to this heading">¶</a></h2>
<p>Userspace gets a regulatory domain in the kernel by having
a userspace agent build it and send it via nl80211. Only
expected regulatory domains will be respected by the kernel.</p>
<p>A currently available userspace agent which can accomplish this
is CRDA - central regulatory domain agent. Its documented here:</p>
<p><a class="reference external" href="https://wireless.wiki.kernel.org/en/developers/Regulatory/CRDA">https://wireless.wiki.kernel.org/en/developers/Regulatory/CRDA</a></p>
<p>Essentially the kernel will send a udev event when it knows
it needs a new regulatory domain. A udev rule can be put in place
to trigger crda to send the respective regulatory domain for a
specific ISO/IEC 3166 alpha2.</p>
<p>Below is an example udev rule which can be used:</p>
<p># Example file, should be put in /etc/udev/rules.d/regulatory.rules
KERNEL==”regulatory*”, ACTION==”change”, SUBSYSTEM==”platform”, RUN+=”/sbin/crda”</p>
<p>The alpha2 is passed as an environment variable under the variable COUNTRY.</p>
</section>
<section id="who-asks-for-regulatory-domains">
<h2>Who asks for regulatory domains?<a class="headerlink" href="#who-asks-for-regulatory-domains" title="Link to this heading">¶</a></h2>
<ul class="simple">
<li><p>Users</p></li>
</ul>
<p>Users can use iw:</p>
<p><a class="reference external" href="https://wireless.wiki.kernel.org/en/users/Documentation/iw">https://wireless.wiki.kernel.org/en/users/Documentation/iw</a></p>
<p>An example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span># set regulatory domain to "Costa Rica"
iw reg set CR
</pre></div>
</div>
<p>This will request the kernel to set the regulatory domain to
the specified alpha2. The kernel in turn will then ask userspace
to provide a regulatory domain for the alpha2 specified by the user
by sending a uevent.</p>
<ul class="simple">
<li><p>Wireless subsystems for Country Information elements</p></li>
</ul>
<p>The kernel will send a uevent to inform userspace a new
regulatory domain is required. More on this to be added
as its integration is added.</p>
<ul class="simple">
<li><p>Drivers</p></li>
</ul>
<p>If drivers determine they need a specific regulatory domain
set they can inform the wireless core using <a class="reference internal" href="../driver-api/80211/cfg80211.html#c.regulatory_hint" title="regulatory_hint"><code class="xref c c-func docutils literal notranslate"><span class="pre">regulatory_hint()</span></code></a>.
They have two options -- they either provide an alpha2 so that
crda can provide back a regulatory domain for that country or
they can build their own regulatory domain based on internal
custom knowledge so the wireless core can respect it.</p>
<p><em>Most</em> drivers will rely on the first mechanism of providing a
regulatory hint with an alpha2. For these drivers there is an additional
check that can be used to ensure compliance based on custom EEPROM
regulatory data. This additional check can be used by drivers by
registering on its <a class="reference internal" href="../driver-api/80211/cfg80211.html#c.wiphy" title="wiphy"><code class="xref c c-struct docutils literal notranslate"><span class="pre">struct</span> <span class="pre">wiphy</span></code></a> a <code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">reg_notifier()</span></code> callback. This notifier
is called when the core’s regulatory domain has been changed. The driver
can use this to review the changes made and also review who made them
(driver, user, country IE) and determine what to allow based on its
internal EEPROM data. Devices drivers wishing to be capable of world
roaming should use this callback. More on world roaming will be
added to this document when its support is enabled.</p>
<p>Device drivers who provide their own built regulatory domain
do not need a callback as the channels registered by them are
the only ones that will be allowed and therefore <em>additional</em>
channels cannot be enabled.</p>
</section>
<section id="example-code-drivers-hinting-an-alpha2">
<h2>Example code - drivers hinting an alpha2:<a class="headerlink" href="#example-code-drivers-hinting-an-alpha2" title="Link to this heading">¶</a></h2>
<p>This example comes from the zd1211rw device driver. You can start
by having a mapping of your device’s EEPROM country/regulatory
domain value to a specific alpha2 as follows:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>static struct zd_reg_alpha2_map reg_alpha2_map[] = {
{ ZD_REGDOMAIN_FCC, "US" },
{ ZD_REGDOMAIN_IC, "CA" },
{ ZD_REGDOMAIN_ETSI, "DE" }, /* Generic ETSI, use most restrictive */
{ ZD_REGDOMAIN_JAPAN, "JP" },
{ ZD_REGDOMAIN_JAPAN_ADD, "JP" },
{ ZD_REGDOMAIN_SPAIN, "ES" },
{ ZD_REGDOMAIN_FRANCE, "FR" },
</pre></div>
</div>
<p>Then you can define a routine to map your read EEPROM value to an alpha2,
as follows:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>static int zd_reg2alpha2(u8 regdomain, char *alpha2)
{
unsigned int i;
struct zd_reg_alpha2_map *reg_map;
for (i = 0; i < ARRAY_SIZE(reg_alpha2_map); i++) {
reg_map = &reg_alpha2_map[i];
if (regdomain == reg_map->reg) {
alpha2[0] = reg_map->alpha2[0];
alpha2[1] = reg_map->alpha2[1];
return 0;
}
}
return 1;
}
</pre></div>
</div>
<p>Lastly, you can then hint to the core of your discovered alpha2, if a match
was found. You need to do this after you have registered your wiphy. You
are expected to do this during initialization.</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>r = zd_reg2alpha2(mac->regdomain, alpha2);
if (!r)
regulatory_hint(hw->wiphy, alpha2);
</pre></div>
</div>
</section>
<section id="example-code-drivers-providing-a-built-in-regulatory-domain">
<h2>Example code - drivers providing a built in regulatory domain:<a class="headerlink" href="#example-code-drivers-providing-a-built-in-regulatory-domain" title="Link to this heading">¶</a></h2>
<p>[NOTE: This API is not currently available, it can be added when required]</p>
<p>If you have regulatory information you can obtain from your
driver and you <em>need</em> to use this we let you build a regulatory domain
structure and pass it to the wireless core. To do this you should
<a class="reference internal" href="../core-api/mm-api.html#c.kmalloc" title="kmalloc"><code class="xref c c-func docutils literal notranslate"><span class="pre">kmalloc()</span></code></a> a structure big enough to hold your regulatory domain
structure and you should then fill it with your data. Finally you simply
call <a class="reference internal" href="../driver-api/80211/cfg80211.html#c.regulatory_hint" title="regulatory_hint"><code class="xref c c-func docutils literal notranslate"><span class="pre">regulatory_hint()</span></code></a> with the regulatory domain structure in it.</p>
<p>Below is a simple example, with a regulatory domain cached using the stack.
Your implementation may vary (read EEPROM cache instead, for example).</p>
<p>Example cache of some regulatory domain:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>struct ieee80211_regdomain mydriver_jp_regdom = {
.n_reg_rules = 3,
.alpha2 = "JP",
//.alpha2 = "99", /* If I have no alpha2 to map it to */
.reg_rules = {
/* IEEE 802.11b/g, channels 1..14 */
REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
/* IEEE 802.11a, channels 34..48 */
REG_RULE(5170-10, 5240+10, 40, 6, 20,
NL80211_RRF_NO_IR),
/* IEEE 802.11a, channels 52..64 */
REG_RULE(5260-10, 5320+10, 40, 6, 20,
NL80211_RRF_NO_IR|
NL80211_RRF_DFS),
}
};
</pre></div>
</div>
<p>Then in some part of your code after your wiphy has been registered:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>struct ieee80211_regdomain *rd;
int size_of_regd;
int num_rules = mydriver_jp_regdom.n_reg_rules;
unsigned int i;
size_of_regd = sizeof(struct ieee80211_regdomain) +
(num_rules * sizeof(struct ieee80211_reg_rule));
rd = kzalloc(size_of_regd, GFP_KERNEL);
if (!rd)
return -ENOMEM;
memcpy(rd, &mydriver_jp_regdom, sizeof(struct ieee80211_regdomain));
for (i=0; i < num_rules; i++)
memcpy(&rd->reg_rules[i],
&mydriver_jp_regdom.reg_rules[i],
sizeof(struct ieee80211_reg_rule));
regulatory_struct_hint(rd);
</pre></div>
</div>
</section>
<section id="statically-compiled-regulatory-database">
<h2>Statically compiled regulatory database<a class="headerlink" href="#statically-compiled-regulatory-database" title="Link to this heading">¶</a></h2>
<p>When a database should be fixed into the kernel, it can be provided as a
firmware file at build time that is then linked into the kernel.</p>
</section>
</section>
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| psp.html | File | 18.66 KB | 0644 |
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| radiotap-headers.html | File | 14.73 KB | 0644 |
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| rds.html | File | 29.39 KB | 0644 |
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| regulatory.html | File | 18.44 KB | 0644 |
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| representors.html | File | 25.79 KB | 0644 |
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| rxrpc.html | File | 130.88 KB | 0644 |
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| scaling.html | File | 40.25 KB | 0644 |
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| sctp.html | File | 9.73 KB | 0644 |
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| secid.html | File | 8.42 KB | 0644 |
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| seg6-sysctl.html | File | 9.53 KB | 0644 |
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| segmentation-offloads.html | File | 17.81 KB | 0644 |
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| sfp-phylink.html | File | 41.09 KB | 0644 |
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| skbuff.html | File | 29.22 KB | 0644 |
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| smc-sysctl.html | File | 10.42 KB | 0644 |
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| snmp_counter.html | File | 91.51 KB | 0644 |
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| sriov.html | File | 9.46 KB | 0644 |
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| statistics.html | File | 31.78 KB | 0644 |
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| strparser.html | File | 19.15 KB | 0644 |
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| switchdev.html | File | 39.55 KB | 0644 |
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| sysfs-tagging.html | File | 10.95 KB | 0644 |
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| tc-actions-env-rules.html | File | 8.87 KB | 0644 |
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| tc-queue-filters.html | File | 9.33 KB | 0644 |
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| tcp-thin.html | File | 10.33 KB | 0644 |
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| tcp_ao.html | File | 35.85 KB | 0644 |
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| team.html | File | 7.93 KB | 0644 |
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| timestamping.html | File | 59.83 KB | 0644 |
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| tipc.html | File | 384.61 KB | 0644 |
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| tls-handshake.html | File | 21.18 KB | 0644 |
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| tls-offload.html | File | 42.72 KB | 0644 |
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| tproxy.html | File | 13.18 KB | 0644 |
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| tuntap.html | File | 19 KB | 0644 |
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| udplite.html | File | 23.04 KB | 0644 |
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| vrf.html | File | 28.46 KB | 0644 |
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| vxlan.html | File | 11.95 KB | 0644 |
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| x25-iface.html | File | 10.9 KB | 0644 |
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| x25.html | File | 10.07 KB | 0644 |
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| xdp-rx-metadata.html | File | 27.46 KB | 0644 |
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| xfrm_device.html | File | 19.14 KB | 0644 |
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| xfrm_proc.html | File | 11.37 KB | 0644 |
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| xfrm_sync.html | File | 15.85 KB | 0644 |
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| xfrm_sysctl.html | File | 8.07 KB | 0644 |
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| xsk-tx-metadata.html | File | 18.64 KB | 0644 |
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