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| |
| <section id="netlink-route-support"> |
| <h1>Netlink Route support<a class="headerlink" href="#netlink-route-support" title="Permalink to this heading"></a></h1> |
| <p>Netlink Route (<code class="xref c c-macro docutils literal notranslate"><span class="pre">NETLINK_ROUTE</span></code>) allow notifying msg when the network |
| changes. And then apps can obtain these changes by monitoring to netlink socket |
| messages.</p> |
| <p>NuttX supports Netlink Route groups</p> |
| <ul class="simple"> |
| <li><p>RTMGRP_IPV4_ROUTE | RTMGRP_IPV6_ROUTE |
| - Notify when IPV4|IPV6 routing table changes.</p></li> |
| <li><p>RTMGRP_NEIGH |
| - Notify when ARP (IPV4) or neighbors (IPV6) table changes.</p></li> |
| <li><p>RTNLGRP_IPV6_PREFIX |
| - Notify when IPV6 prefix changes.</p></li> |
| </ul> |
| <section id="messages-content"> |
| <h2>Messages content<a class="headerlink" href="#messages-content" title="Permalink to this heading"></a></h2> |
| <ol class="arabic simple"> |
| <li><p>RTMGRP_IPV4_ROUTE | RTMGRP_IPV6_ROUTE</p></li> |
| </ol> |
| <blockquote> |
| <div><p><code class="docutils literal notranslate"><span class="pre">RTM_NEWROUTE</span></code>, <code class="docutils literal notranslate"><span class="pre">RTM_DELROUTE</span></code>, <code class="docutils literal notranslate"><span class="pre">RTM_GETROUTE</span></code>: |
| Create, remove or receive information about a network route. These |
| messages contain an rtmsg structure with 3 optional sequence of |
| rtattr structures following.</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span><span class="w"> </span><span class="nc">getroute_recvfrom_ipv4addr_s</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">rtattr</span><span class="w"> </span><span class="n">attr</span><span class="p">;</span> |
| <span class="w"> </span><span class="n">in_addr_t</span><span class="w"> </span><span class="n">addr</span><span class="p">;</span> |
| <span class="p">};</span> |
| |
| <span class="k">struct</span><span class="w"> </span><span class="nc">getroute_recvfrom_ipv4response_s</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">nlmsghdr</span><span class="w"> </span><span class="n">hdr</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">rtmsg</span><span class="w"> </span><span class="n">rte</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">getroute_recvfrom_ipv4addr_s</span><span class="w"> </span><span class="n">dst</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">getroute_recvfrom_ipv4addr_s</span><span class="w"> </span><span class="n">genmask</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">getroute_recvfrom_ipv4addr_s</span><span class="w"> </span><span class="n">gateway</span><span class="p">;</span> |
| <span class="p">};</span> |
| |
| <span class="k">struct</span><span class="w"> </span><span class="nc">getroute_recvfrom_ipv6addr_s</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">rtattr</span><span class="w"> </span><span class="n">attr</span><span class="p">;</span> |
| <span class="w"> </span><span class="n">net_ipv6addr_t</span><span class="w"> </span><span class="n">addr</span><span class="p">;</span> |
| <span class="p">};</span> |
| |
| <span class="k">struct</span><span class="w"> </span><span class="nc">getroute_recvfrom_ipv6response_s</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">nlmsghdr</span><span class="w"> </span><span class="n">hdr</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">rtmsg</span><span class="w"> </span><span class="n">rte</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">getroute_recvfrom_ipv6addr_s</span><span class="w"> </span><span class="n">dst</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">getroute_recvfrom_ipv6addr_s</span><span class="w"> </span><span class="n">genmask</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">getroute_recvfrom_ipv6addr_s</span><span class="w"> </span><span class="n">gateway</span><span class="p">;</span> |
| <span class="p">};</span> |
| </pre></div> |
| </div> |
| </div></blockquote> |
| <ol class="arabic simple" start="2"> |
| <li><p>RTMGRP_NEIGH</p></li> |
| </ol> |
| <blockquote> |
| <div><p><code class="docutils literal notranslate"><span class="pre">RTM_NEWNEIGH</span></code>, <code class="docutils literal notranslate"><span class="pre">RTM_DELNEIGH</span></code>, <code class="docutils literal notranslate"><span class="pre">RTM_GETNEIGH</span></code>: |
| Add, remove or receive information about a neighbor table entry (e.g., |
| an ARP entry). The message contains an ndmsg structure and optional |
| sequence of rtattr structures following. And the date will be <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">arpreq</span></code> |
| in <code class="docutils literal notranslate"><span class="pre">include/netinet/arp.h``or</span> <span class="pre">``struct</span> <span class="pre">neighbor_entry_s</span></code> in <code class="docutils literal notranslate"><span class="pre">include/net/neighbor.h</span></code></p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span><span class="w"> </span><span class="nc">getneigh_recvfrom_response_s</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">nlmsghdr</span><span class="w"> </span><span class="n">hdr</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">ndmsg</span><span class="w"> </span><span class="n">msg</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">rtattr</span><span class="w"> </span><span class="n">attr</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">data</span><span class="p">[</span><span class="mi">1</span><span class="p">];</span> |
| <span class="p">};</span> |
| </pre></div> |
| </div> |
| </div></blockquote> |
| <ol class="arabic simple" start="3"> |
| <li><p>RTNLGRP_IPV6_PREFIX</p></li> |
| </ol> |
| <blockquote> |
| <div><p><code class="docutils literal notranslate"><span class="pre">RTM_NEWPREFIX</span></code>: |
| Receive information about IPV6 prefix. The message contains an prefixmsg structure |
| and two optional sequence of rtattr structures following. And the <code class="docutils literal notranslate"><span class="pre">addr</span></code> and |
| <code class="docutils literal notranslate"><span class="pre">prefix_cacheinfo</span></code> are parsed from the RA message.</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span><span class="w"> </span><span class="nc">getprefix_recvfrom_addr_s</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">rtattr</span><span class="w"> </span><span class="n">attr</span><span class="p">;</span> |
| <span class="w"> </span><span class="n">net_ipv6addr_t</span><span class="w"> </span><span class="n">addr</span><span class="p">;</span> |
| <span class="p">};</span> |
| |
| <span class="k">struct</span><span class="w"> </span><span class="nc">getprefix_recvfrom_cache_s</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">rtattr</span><span class="w"> </span><span class="n">attr</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">prefix_cacheinfo</span><span class="w"> </span><span class="n">pci</span><span class="p">;</span> |
| <span class="p">};</span> |
| |
| <span class="k">struct</span><span class="w"> </span><span class="nc">getprefix_recvfrom_response_s</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">nlmsghdr</span><span class="w"> </span><span class="n">hdr</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">prefixmsg</span><span class="w"> </span><span class="n">pmsg</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">getprefix_recvfrom_addr_s</span><span class="w"> </span><span class="n">prefix</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">getprefix_recvfrom_cache_s</span><span class="w"> </span><span class="n">pci</span><span class="p">;</span> |
| <span class="p">};</span> |
| </pre></div> |
| </div> |
| </div></blockquote> |
| </section> |
| <section id="usage"> |
| <h2>Usage<a class="headerlink" href="#usage" title="Permalink to this heading"></a></h2> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span><span class="w"> </span><span class="nc">sockaddr_nl</span><span class="w"> </span><span class="n">addr</span><span class="p">;</span> |
| <span class="k">struct</span><span class="w"> </span><span class="nc">nlmsghdr</span><span class="w"> </span><span class="o">*</span><span class="n">hdr</span><span class="p">;</span> |
| <span class="kt">uint8_t</span><span class="w"> </span><span class="n">buffer</span><span class="p">[</span><span class="n">BUFSIZE</span><span class="p">];</span> |
| <span class="kt">int</span><span class="w"> </span><span class="n">sd</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">socket</span><span class="p">(</span><span class="n">AF_NETLINK</span><span class="p">,</span><span class="w"> </span><span class="n">SOCK_RAW</span><span class="p">,</span><span class="w"> </span><span class="n">NETLINK_ROUTE</span><span class="p">);</span> |
| |
| <span class="n">addr</span><span class="p">.</span><span class="n">nl_family</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">AF_NETLINK</span><span class="p">;</span> |
| <span class="n">addr</span><span class="p">.</span><span class="n">nl_groups</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">RTMGRP_IPV4_ROUTE</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">RTMGRP_IPV6_ROUTE</span><span class="w"> </span><span class="o">|</span> |
| <span class="w"> </span><span class="n">RTMGRP_NEIGH</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">RTMGRP_IPV6_PREFIX</span><span class="p">;</span> |
| |
| <span class="n">bind</span><span class="p">(</span><span class="n">sd</span><span class="p">,</span><span class="w"> </span><span class="p">(</span><span class="n">FAR</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">sockaddr</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="o">&</span><span class="n">addr</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">addr</span><span class="p">));</span><span class="w"> </span><span class="cm">/* Bind to device */</span> |
| <span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">recv</span><span class="p">(</span><span class="n">sd</span><span class="p">,</span><span class="w"> </span><span class="n">buf</span><span class="p">,</span><span class="w"> </span><span class="n">BUFSIZE</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">hdr</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">buf</span><span class="p">;</span><span class="w"> </span><span class="n">NLMSG_OK</span><span class="p">(</span><span class="n">hdr</span><span class="p">,</span><span class="w"> </span><span class="n">ret</span><span class="p">);</span><span class="w"> </span><span class="n">hdr</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">NLMSG_NEXT</span><span class="p">(</span><span class="n">hdr</span><span class="p">,</span><span class="w"> </span><span class="n">ret</span><span class="p">))</span> |
| <span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">hdr</span><span class="o">-></span><span class="n">nlmsg_type</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">RTM_</span><span class="p">...)</span> |
| <span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="cm">/* Func parsed netlink msg*/</span> |
| <span class="w"> </span><span class="p">...</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="n">close</span><span class="p">(</span><span class="n">sd</span><span class="p">);</span><span class="w"> </span><span class="cm">/* Close the socket */</span> |
| </pre></div> |
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