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<section id="ieee-802-15-4-developer-s-guide">
<h1>IEEE 802.15.4 Developer’s Guide<a class="headerlink" href="#ieee-802-15-4-developer-s-guide" title="Link to this heading">¶</a></h1>
<section id="introduction">
<h2>Introduction<a class="headerlink" href="#introduction" title="Link to this heading">¶</a></h2>
<p>The IEEE 802.15.4 working group focuses on standardization of the bottom
two layers: Medium Access Control (MAC) and Physical access (PHY). And there
are mainly two options available for upper layers:</p>
<ul class="simple">
<li><p>ZigBee - proprietary protocol from the ZigBee Alliance</p></li>
<li><p>6LoWPAN - IPv6 networking over low rate personal area networks</p></li>
</ul>
<p>The goal of the Linux-wpan is to provide a complete implementation
of the IEEE 802.15.4 and 6LoWPAN protocols. IEEE 802.15.4 is a stack
of protocols for organizing Low-Rate Wireless Personal Area Networks.</p>
<p>The stack is composed of three main parts:</p>
<ul class="simple">
<li><p>IEEE 802.15.4 layer;  We have chosen to use plain Berkeley socket API,
the generic Linux networking stack to transfer IEEE 802.15.4 data
messages and a special protocol over netlink for configuration/management</p></li>
<li><p>MAC - provides access to shared channel and reliable data delivery</p></li>
<li><p>PHY - represents device drivers</p></li>
</ul>
</section>
<section id="socket-api">
<h2>Socket API<a class="headerlink" href="#socket-api" title="Link to this heading">¶</a></h2>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>int sd = socket(PF_IEEE802154, SOCK_DGRAM, 0);
</pre></div>
</div>
<p>The address family, socket addresses etc. are defined in the
include/net/af_ieee802154.h header or in the special header
in the userspace package (see either <a class="reference external" href="https://linux-wpan.org/wpan-tools.html">https://linux-wpan.org/wpan-tools.html</a>
or the git tree at <a class="reference external" href="https://github.com/linux-wpan/wpan-tools">https://github.com/linux-wpan/wpan-tools</a>).</p>
</section>
<section id="lowpan-linux-implementation">
<h2>6LoWPAN Linux implementation<a class="headerlink" href="#lowpan-linux-implementation" title="Link to this heading">¶</a></h2>
<p>The IEEE 802.15.4 standard specifies an MTU of 127 bytes, yielding about 80
octets of actual MAC payload once security is turned on, on a wireless link
with a link throughput of 250 kbps or less.  The 6LoWPAN adaptation format
[RFC4944] was specified to carry IPv6 datagrams over such constrained links,
taking into account limited bandwidth, memory, or energy resources that are
expected in applications such as wireless Sensor Networks.  [RFC4944] defines
a Mesh Addressing header to support sub-IP forwarding, a Fragmentation header
to support the IPv6 minimum MTU requirement [RFC2460], and stateless header
compression for IPv6 datagrams (LOWPAN_HC1 and LOWPAN_HC2) to reduce the
relatively large IPv6 and UDP headers down to (in the best case) several bytes.</p>
<p>In September 2011 the standard update was published - [RFC6282].
It deprecates HC1 and HC2 compression and defines IPHC encoding format which is
used in this Linux implementation.</p>
<p>All the code related to 6lowpan you may find in files: net/6lowpan/*
and net/ieee802154/6lowpan/*</p>
<p>To setup a 6LoWPAN interface you need:
1. Add IEEE802.15.4 interface and set channel and PAN ID;
2. Add 6lowpan interface by command like:
# ip link add link wpan0 name lowpan0 type lowpan
3. Bring up ‘lowpan0’ interface</p>
</section>
<section id="drivers">
<h2>Drivers<a class="headerlink" href="#drivers" title="Link to this heading">¶</a></h2>
<p>Like with WiFi, there are several types of devices implementing IEEE 802.15.4.
1) ‘HardMAC’. The MAC layer is implemented in the device itself, the device
exports a management (e.g. MLME) and data API.
2) ‘SoftMAC’ or just radio. These types of devices are just radio transceivers
possibly with some kinds of acceleration like automatic CRC computation and
comparison, automagic ACK handling, address matching, etc.</p>
<p>Each type of device requires a different approach to be hooked into the Linux
kernel.</p>
<section id="hardmac">
<h3>HardMAC<a class="headerlink" href="#hardmac" title="Link to this heading">¶</a></h3>
<p>See the header include/net/ieee802154_netdev.h. You have to implement Linux
net_device, with .type = ARPHRD_IEEE802154. Data is exchanged with socket family
code via plain sk_buffs. On skb reception skb-&gt;cb must contain additional
info as described in the <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">ieee802154_mac_cb</span></code>. During packet transmission
the skb-&gt;cb is used to provide additional data to the device’s
header_ops-&gt;create function. Be aware that this data can be overridden later
(when socket code submits skb to qdisc), so if you need something from that cb
later, you should store info in the skb-&gt;data on your own.</p>
<p>To hook the MLME interface you have to populate the ml_priv field of your
net_device with a pointer to <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">ieee802154_mlme_ops</span></code> instance. The fields
assoc_req, assoc_resp, disassoc_req, start_req, and scan_req are optional.
All other fields are required.</p>
</section>
<section id="softmac">
<h3>SoftMAC<a class="headerlink" href="#softmac" title="Link to this heading">¶</a></h3>
<p>The MAC is the middle layer in the IEEE 802.15.4 Linux stack. At the moment, it
provides an interface for driver registration and management of slave
interfaces.</p>
<p>NOTE: Currently the only monitor device type is supported - it’s IEEE 802.15.4
stack interface for network sniffers (e.g. WireShark).</p>
<p>This layer is going to be extended soon.</p>
<p>See header include/net/mac802154.h and several drivers in
drivers/net/ieee802154/.</p>
</section>
<section id="fake-drivers">
<h3>Fake drivers<a class="headerlink" href="#fake-drivers" title="Link to this heading">¶</a></h3>
<p>In addition there is a driver available which simulates a real device with
SoftMAC (fakelb - IEEE 802.15.4 loopback driver) interface. This option
provides a possibility to test and debug the stack without usage of real hardware.</p>
</section>
</section>
<section id="device-drivers-api">
<h2>Device drivers API<a class="headerlink" href="#device-drivers-api" title="Link to this heading">¶</a></h2>
<p>The include/net/mac802154.h defines following functions:</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.ieee802154_alloc_device">
<span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_dev</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">ieee802154_alloc_device</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">size_t</span></span><span class="w"> </span><span class="n"><span class="pre">priv_size</span></span>, <span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_ops</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">ops</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.ieee802154_alloc_device" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Allocation of IEEE 802.15.4 compatible device.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.ieee802154_free_device">
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">ieee802154_free_device</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_dev</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">dev</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.ieee802154_free_device" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Freeing allocated device.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.ieee802154_register_device">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">ieee802154_register_device</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_dev</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">dev</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.ieee802154_register_device" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Register PHY in the system.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.ieee802154_unregister_device">
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">ieee802154_unregister_device</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_dev</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">dev</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.ieee802154_unregister_device" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Freeing registered PHY.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.ieee802154_rx_irqsafe">
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">ieee802154_rx_irqsafe</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_hw</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">hw</span></span>, <span class="k"><span class="pre">struct</span></span><span class="w"> </span><a class="reference internal" href="kapi.html#c.sk_buff" title="sk_buff"><span class="n"><span class="pre">sk_buff</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">skb</span></span>, <span class="n"><span class="pre">u8</span></span><span class="w"> </span><span class="n"><span class="pre">lqi</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.ieee802154_rx_irqsafe" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Telling 802.15.4 module there is a new received frame in the skb with
the RF Link Quality Indicator (LQI) from the hardware device.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.ieee802154_xmit_complete">
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">ieee802154_xmit_complete</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_hw</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">hw</span></span>, <span class="k"><span class="pre">struct</span></span><span class="w"> </span><a class="reference internal" href="kapi.html#c.sk_buff" title="sk_buff"><span class="n"><span class="pre">sk_buff</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">skb</span></span>, <span class="kt"><span class="pre">bool</span></span><span class="w"> </span><span class="n"><span class="pre">ifs_handling</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.ieee802154_xmit_complete" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Telling 802.15.4 module the frame in the skb is or going to be
transmitted through the hardware device</p>
<p>The device driver must implement the following callbacks in the IEEE 802.15.4
operations structure at least:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>struct ieee802154_ops {
     ...
     int     (*start)(struct ieee802154_hw *hw);
     void    (*stop)(struct ieee802154_hw *hw);
     ...
     int     (*xmit_async)(struct ieee802154_hw *hw, struct sk_buff *skb);
     int     (*ed)(struct ieee802154_hw *hw, u8 *level);
     int     (*set_channel)(struct ieee802154_hw *hw, u8 page, u8 channel);
     ...
};
</pre></div>
</div>
<dl class="c function">
<dt class="sig sig-object c" id="c.start">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">start</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_hw</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">hw</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.start" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Handler that 802.15.4 module calls for the hardware device initialization.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.stop">
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">stop</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_hw</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">hw</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.stop" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Handler that 802.15.4 module calls for the hardware device cleanup.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.xmit_async">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">xmit_async</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_hw</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">hw</span></span>, <span class="k"><span class="pre">struct</span></span><span class="w"> </span><a class="reference internal" href="kapi.html#c.sk_buff" title="sk_buff"><span class="n"><span class="pre">sk_buff</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">skb</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.xmit_async" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Handler that 802.15.4 module calls for each frame in the skb going to be
transmitted through the hardware device.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.ed">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">ed</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_hw</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">hw</span></span>, <span class="n"><span class="pre">u8</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">level</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.ed" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Handler that 802.15.4 module calls for Energy Detection from the hardware
device.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.set_channel">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">set_channel</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">ieee802154_hw</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">hw</span></span>, <span class="n"><span class="pre">u8</span></span><span class="w"> </span><span class="n"><span class="pre">page</span></span>, <span class="n"><span class="pre">u8</span></span><span class="w"> </span><span class="n"><span class="pre">channel</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.set_channel" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p>Set radio for listening on specific channel of the hardware device.</p>
<p>Moreover IEEE 802.15.4 device operations structure should be filled.</p>
</section>
</section>


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