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<h1>Netfilter Netlink</h1> </div>
<div class="ingroups"><a class="el" href="group__nlfam.html">Netlink Families</a></div></div>
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<tr><td colspan="2"><h2><a name="groups"></a>
Modules</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ct.html">Conntrack</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__log.html">Log</a></td></tr>
<tr><td colspan="2"><h2><a name="member-group"></a>
Socket Creating</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__nfnl.html#gaec500dac0b101190326f90e2abd3f7f8">nfnl_connect</a> (struct nl_handle *handle)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Create and connect netfilter netlink socket. <a href="#gaec500dac0b101190326f90e2abd3f7f8"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="member-group"></a>
Sending</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__nfnl.html#ga0c1b3dd550e49dfc74f4ba18cc6cfebf">nfnl_send_simple</a> (struct nl_handle *handle, uint8_t subsys_id, uint8_t type, int flags, uint8_t family, uint16_t res_id)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Send trivial netfilter netlink message. <a href="#ga0c1b3dd550e49dfc74f4ba18cc6cfebf"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="member-group"></a>
Message Parsing</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__nfnl.html#ga8bf67cd1369d4b882a38bdfa27ffb02a">nfnlmsg_subsys</a> (struct <a class="el" href="structnlmsghdr.html">nlmsghdr</a> *nlh)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get netfilter subsystem id from message. <a href="#ga8bf67cd1369d4b882a38bdfa27ffb02a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__nfnl.html#gaf1bb10eb2462b46f2a4bf48d1a0e0c33">nfnlmsg_subtype</a> (struct <a class="el" href="structnlmsghdr.html">nlmsghdr</a> *nlh)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get netfilter message type from message. <a href="#gaf1bb10eb2462b46f2a4bf48d1a0e0c33"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__nfnl.html#ga91b2b1c9b8e243fe070229ef3fff3d6c">nfnlmsg_family</a> (struct <a class="el" href="structnlmsghdr.html">nlmsghdr</a> *nlh)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get netfilter family from message. <a href="#ga91b2b1c9b8e243fe070229ef3fff3d6c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">uint16_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__nfnl.html#ga81d2b6a0cdc1ad5a48a15d536c0a8a6d">nfnlmsg_res_id</a> (struct <a class="el" href="structnlmsghdr.html">nlmsghdr</a> *nlh)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get netfilter resource id from message. <a href="#ga81d2b6a0cdc1ad5a48a15d536c0a8a6d"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="member-group"></a>
Message Building</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct nl_msg * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__nfnl.html#gaf2c5b1fb596e8fdb62eb782496ac88c3">nfnlmsg_alloc_simple</a> (uint8_t subsys_id, uint8_t type, int flags, uint8_t family, uint16_t res_id)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate a new netfilter netlink message. <a href="#gaf2c5b1fb596e8fdb62eb782496ac88c3"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__nfnl.html#ga94e6a82031c8e4cecca7140e2d0a62f4">nfnlmsg_put</a> (struct nl_msg *msg, uint32_t pid, uint32_t seq, uint8_t subsys_id, uint8_t type, int flags, uint8_t family, uint16_t res_id)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Add netlink and netfilter netlink headers to netlink message. <a href="#ga94e6a82031c8e4cecca7140e2d0a62f4"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<dl class="user"><dt><b>Message Format</b></dt><dd><div class="fragment"><pre class="fragment"> <------- NLMSG_ALIGN(hlen) ------> <---- NLMSG_ALIGN(len) --->
+----------------------------+- - -+- - - - - - - - - - -+- - -+
| Header | Pad | Payload | Pad |
| <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> | | | |
+----------------------------+- - -+- - - - - - - - - - -+- - -+
</pre></div> <div class="fragment"><pre class="fragment"> <-------- NFNL_HDRLEN --------->
+--------------------------+- - -+------------+
| Netfilter Netlink Header | Pad | Attributes |
| <span class="keyword">struct </span>nfgenmsg | | |
+--------------------------+- - -+------------+
nfnlmsg_attrdata(nfg, hdrlen)-----^
</pre></div></dd></dl>
<dl class="user"><dt><b>1) Creating a new netfilter netlink message</b></dt><dd><div class="fragment"><pre class="fragment"> <span class="keyword">struct </span>nl_msg *msg;
<span class="comment">// Create a new empty netlink message</span>
msg = <a class="code" href="group__msg.html#ga89c936bdf5e73455bb1640a0eb8a020d" title="Allocate a new netlink message with the default maximum payload size.">nlmsg_alloc</a>();
<span class="comment">// Append the netlink and netfilter netlink message header</span>
hdr = <a class="code" href="group__nfnl.html#ga94e6a82031c8e4cecca7140e2d0a62f4" title="Add netlink and netfilter netlink headers to netlink message.">nfnlmsg_put</a>(msg, PID, SEQ, SUBSYS, TYPE, <a class="code" href="group__msg.html#gac39e15f4f5ba3d381bceae0f0476d001" title="Echo this request.">NLM_F_ECHO</a>,
FAMILY, RES_ID);
<span class="comment">// Append the attributes.</span>
<a class="code" href="group__attr.html#ga9891f766dcebe6bdb2ce86f021c6f6e6" title="Add a u32 netlink attribute to a netlink message.">nla_put_u32</a>(msg, 1, 0x10);
<span class="comment">// Message is ready to be sent.</span>
<a class="code" href="group__nl.html#ga01a2aad82350f867e704d5c696438b60" title="Send netlink message and check &amp; extend header values as needed.">nl_send_auto_complete</a>(nl_handle, msg);
<span class="comment">// All done? Free the message.</span>
<a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
</pre></div></dd></dl>
<dl class="user"><dt><b>2) Sending of trivial messages</b></dt><dd><div class="fragment"><pre class="fragment"> <span class="comment">// For trivial messages not requiring any subsys specific header or</span>
<span class="comment">// attributes, nfnl_send_simple() may be used to send messages directly.</span>
<a class="code" href="group__nfnl.html#ga0c1b3dd550e49dfc74f4ba18cc6cfebf" title="Send trivial netfilter netlink message.">nfnl_send_simple</a>(nl_handle, SUBSYS, TYPE, 0, FAMILY, RES_ID);
</pre></div> </dd></dl>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="gaec500dac0b101190326f90e2abd3f7f8"></a><!-- doxytag: member="nfnl.c::nfnl_connect" ref="gaec500dac0b101190326f90e2abd3f7f8" args="(struct nl_handle *handle)" -->
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<td class="memname">int nfnl_connect </td>
<td>(</td>
<td class="paramtype">struct nl_handle * </td>
<td class="paramname"><em>handle</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">handle</td><td>Netlink handle.</td></tr>
</table>
</dd>
</dl>
<p>Creates a NETLINK_NETFILTER netlink socket, binds the socket and issues a connection attempt.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="group__nl.html#ga68655d7fa8bd1944bec4761c95e576e9" title="Create and connect netlink socket.">nl_connect()</a></dd></dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>0 on success or a negative error code. </dd></dl>
<p>Definition at line <a class="el" href="nfnl_8c_source.html#l00085">85</a> of file <a class="el" href="nfnl_8c_source.html">nfnl.c</a>.</p>
<p>References <a class="el" href="nl_8c_source.html#l00191">nl_connect()</a>.</p>
<div class="fragment"><pre class="fragment">{
<span class="keywordflow">return</span> <a class="code" href="group__nl.html#ga68655d7fa8bd1944bec4761c95e576e9" title="Create and connect netlink socket.">nl_connect</a>(handle, NETLINK_NETFILTER);
}
</pre></div>
</div>
</div>
<a class="anchor" id="ga0c1b3dd550e49dfc74f4ba18cc6cfebf"></a><!-- doxytag: member="nfnl.c::nfnl_send_simple" ref="ga0c1b3dd550e49dfc74f4ba18cc6cfebf" args="(struct nl_handle *handle, uint8_t subsys_id, uint8_t type, int flags, uint8_t family, uint16_t res_id)" -->
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<td class="memname">int nfnl_send_simple </td>
<td>(</td>
<td class="paramtype">struct nl_handle * </td>
<td class="paramname"><em>handle</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t </td>
<td class="paramname"><em>subsys_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t </td>
<td class="paramname"><em>type</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>flags</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t </td>
<td class="paramname"><em>family</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint16_t </td>
<td class="paramname"><em>res_id</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">handle</td><td>Netlink handle. </td></tr>
<tr><td class="paramname">subsys_id</td><td>nfnetlink subsystem </td></tr>
<tr><td class="paramname">type</td><td>nfnetlink message type </td></tr>
<tr><td class="paramname">flags</td><td>message flags </td></tr>
<tr><td class="paramname">family</td><td>nfnetlink address family </td></tr>
<tr><td class="paramname">res_id</td><td>nfnetlink resource id</td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>Newly allocated netlink message or NULL. </dd></dl>
<p>Definition at line <a class="el" href="nfnl_8c_source.html#l00108">108</a> of file <a class="el" href="nfnl_8c_source.html">nfnl.c</a>.</p>
<p>References <a class="el" href="nl_8c_source.html#l00410">nl_send_simple()</a>.</p>
<div class="fragment"><pre class="fragment">{
<span class="keyword">struct </span>nfgenmsg hdr = {
.nfgen_family = family,
.version = NFNETLINK_V0,
.res_id = htons(res_id),
};
<span class="keywordflow">return</span> <a class="code" href="group__nl.html#ga73ed88a505f2d67bcf328183fe1e692a" title="Send simple netlink message using nl_send_auto_complete()">nl_send_simple</a>(handle, NFNLMSG_TYPE(subsys_id, type), flags,
&hdr, <span class="keyword">sizeof</span>(hdr));
}
</pre></div>
</div>
</div>
<a class="anchor" id="ga8bf67cd1369d4b882a38bdfa27ffb02a"></a><!-- doxytag: member="nfnl.c::nfnlmsg_subsys" ref="ga8bf67cd1369d4b882a38bdfa27ffb02a" args="(struct nlmsghdr *nlh)" -->
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<td class="memname">uint8_t nfnlmsg_subsys </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structnlmsghdr.html">nlmsghdr</a> * </td>
<td class="paramname"><em>nlh</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">nlh</td><td>netlink messsage header </td></tr>
</table>
</dd>
</dl>
<p>Definition at line <a class="el" href="nfnl_8c_source.html#l00132">132</a> of file <a class="el" href="nfnl_8c_source.html">nfnl.c</a>.</p>
<p>References <a class="el" href="netlink-kernel_8h_source.html#l00037">nlmsghdr::nlmsg_type</a>.</p>
<div class="fragment"><pre class="fragment">{
<span class="keywordflow">return</span> NFNL_SUBSYS_ID(nlh-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>);
}
</pre></div>
</div>
</div>
<a class="anchor" id="gaf1bb10eb2462b46f2a4bf48d1a0e0c33"></a><!-- doxytag: member="nfnl.c::nfnlmsg_subtype" ref="gaf1bb10eb2462b46f2a4bf48d1a0e0c33" args="(struct nlmsghdr *nlh)" -->
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<td class="memname">uint8_t nfnlmsg_subtype </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structnlmsghdr.html">nlmsghdr</a> * </td>
<td class="paramname"><em>nlh</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">nlh</td><td>netlink messsage header </td></tr>
</table>
</dd>
</dl>
<p>Definition at line <a class="el" href="nfnl_8c_source.html#l00141">141</a> of file <a class="el" href="nfnl_8c_source.html">nfnl.c</a>.</p>
<p>References <a class="el" href="netlink-kernel_8h_source.html#l00037">nlmsghdr::nlmsg_type</a>.</p>
<div class="fragment"><pre class="fragment">{
<span class="keywordflow">return</span> NFNL_MSG_TYPE(nlh-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>);
}
</pre></div>
</div>
</div>
<a class="anchor" id="ga91b2b1c9b8e243fe070229ef3fff3d6c"></a><!-- doxytag: member="nfnl.c::nfnlmsg_family" ref="ga91b2b1c9b8e243fe070229ef3fff3d6c" args="(struct nlmsghdr *nlh)" -->
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<td class="memname">uint8_t nfnlmsg_family </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structnlmsghdr.html">nlmsghdr</a> * </td>
<td class="paramname"><em>nlh</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">nlh</td><td>netlink messsage header </td></tr>
</table>
</dd>
</dl>
<p>Definition at line <a class="el" href="nfnl_8c_source.html#l00150">150</a> of file <a class="el" href="nfnl_8c_source.html">nfnl.c</a>.</p>
<p>References <a class="el" href="msg_8c_source.html#l00218">nlmsg_data()</a>.</p>
<div class="fragment"><pre class="fragment">{
<span class="keyword">struct </span>nfgenmsg *nfg = <a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="head of message payload">nlmsg_data</a>(nlh);
<span class="keywordflow">return</span> nfg->nfgen_family;
}
</pre></div>
</div>
</div>
<a class="anchor" id="ga81d2b6a0cdc1ad5a48a15d536c0a8a6d"></a><!-- doxytag: member="nfnl.c::nfnlmsg_res_id" ref="ga81d2b6a0cdc1ad5a48a15d536c0a8a6d" args="(struct nlmsghdr *nlh)" -->
<div class="memitem">
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<td class="memname">uint16_t nfnlmsg_res_id </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structnlmsghdr.html">nlmsghdr</a> * </td>
<td class="paramname"><em>nlh</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">nlh</td><td>netlink messsage header </td></tr>
</table>
</dd>
</dl>
<p>Definition at line <a class="el" href="nfnl_8c_source.html#l00161">161</a> of file <a class="el" href="nfnl_8c_source.html">nfnl.c</a>.</p>
<p>References <a class="el" href="msg_8c_source.html#l00218">nlmsg_data()</a>.</p>
<div class="fragment"><pre class="fragment">{
<span class="keyword">struct </span>nfgenmsg *nfg = <a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="head of message payload">nlmsg_data</a>(nlh);
<span class="keywordflow">return</span> ntohs(nfg->res_id);
}
</pre></div>
</div>
</div>
<a class="anchor" id="gaf2c5b1fb596e8fdb62eb782496ac88c3"></a><!-- doxytag: member="nfnl.c::nfnlmsg_alloc_simple" ref="gaf2c5b1fb596e8fdb62eb782496ac88c3" args="(uint8_t subsys_id, uint8_t type, int flags, uint8_t family, uint16_t res_id)" -->
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<td class="memname">struct nl_msg* nfnlmsg_alloc_simple </td>
<td>(</td>
<td class="paramtype">uint8_t </td>
<td class="paramname"><em>subsys_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t </td>
<td class="paramname"><em>type</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>flags</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t </td>
<td class="paramname"><em>family</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint16_t </td>
<td class="paramname"><em>res_id</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [read]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">subsys_id</td><td>nfnetlink subsystem </td></tr>
<tr><td class="paramname">type</td><td>nfnetlink message type </td></tr>
<tr><td class="paramname">flags</td><td>message flags </td></tr>
<tr><td class="paramname">family</td><td>nfnetlink address family </td></tr>
<tr><td class="paramname">res_id</td><td>nfnetlink resource id</td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>Newly allocated netlink message or NULL. </dd></dl>
<p>Definition at line <a class="el" href="nfnl_8c_source.html#l00201">201</a> of file <a class="el" href="nfnl_8c_source.html">nfnl.c</a>.</p>
<p>References <a class="el" href="msg_8c_source.html#l00448">nlmsg_alloc_simple()</a>, and <a class="el" href="msg_8c_source.html#l00656">nlmsg_free()</a>.</p>
<div class="fragment"><pre class="fragment">{
<span class="keyword">struct </span>nl_msg *msg;
msg = <a class="code" href="group__msg.html#ga580d8697d19050c55060bc10ab4eae9f" title="Allocate a new netlink message.">nlmsg_alloc_simple</a>(NFNLMSG_TYPE(subsys_id, type), flags);
<span class="keywordflow">if</span> (msg == NULL)
<span class="keywordflow">return</span> NULL;
<span class="keywordflow">if</span> (nfnlmsg_append(msg, family, res_id) < 0)
<span class="keywordflow">goto</span> nla_put_failure;
<span class="keywordflow">return</span> msg;
nla_put_failure:
<a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<span class="keywordflow">return</span> NULL;
}
</pre></div>
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</div>
<a class="anchor" id="ga94e6a82031c8e4cecca7140e2d0a62f4"></a><!-- doxytag: member="nfnl.c::nfnlmsg_put" ref="ga94e6a82031c8e4cecca7140e2d0a62f4" args="(struct nl_msg *msg, uint32_t pid, uint32_t seq, uint8_t subsys_id, uint8_t type, int flags, uint8_t family, uint16_t res_id)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int nfnlmsg_put </td>
<td>(</td>
<td class="paramtype">struct nl_msg * </td>
<td class="paramname"><em>msg</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>pid</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>seq</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t </td>
<td class="paramname"><em>subsys_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t </td>
<td class="paramname"><em>type</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>flags</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t </td>
<td class="paramname"><em>family</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint16_t </td>
<td class="paramname"><em>res_id</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">msg</td><td>netlink message </td></tr>
<tr><td class="paramname">pid</td><td>netlink process id </td></tr>
<tr><td class="paramname">seq</td><td>sequence number of message </td></tr>
<tr><td class="paramname">subsys_id</td><td>nfnetlink subsystem </td></tr>
<tr><td class="paramname">type</td><td>nfnetlink message type </td></tr>
<tr><td class="paramname">flags</td><td>message flags </td></tr>
<tr><td class="paramname">family</td><td>nfnetlink address family </td></tr>
<tr><td class="paramname">res_id</td><td>nfnetlink resource id </td></tr>
</table>
</dd>
</dl>
<p>Definition at line <a class="el" href="nfnl_8c_source.html#l00231">231</a> of file <a class="el" href="nfnl_8c_source.html">nfnl.c</a>.</p>
<p>References <a class="el" href="msg_8c_source.html#l00610">nlmsg_put()</a>.</p>
<div class="fragment"><pre class="fragment">{
<span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh;
nlh = <a class="code" href="group__msg.html#ga16919a9a8579f8b538b0376781c1839d" title="Add a netlink message header to a netlink message.">nlmsg_put</a>(msg, pid, seq, NFNLMSG_TYPE(subsys_id, type), 0, flags);
<span class="keywordflow">if</span> (nlh == NULL)
<span class="keywordflow">return</span> nl_get_errno();
<span class="keywordflow">return</span> nfnlmsg_append(msg, family, res_id);
}
</pre></div>
</div>
</div>
</div>
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