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-<table class="head">
-  <tr>
-    <td class="head-ltitle">SNL(3)</td>
-    <td class="head-vol">Library Functions Manual</td>
-    <td class="head-rtitle">SNL(3)</td>
-  </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">snl_init</code>,
-    <code class="Nm">snl_free</code>, <code class="Nm">snl_read_message</code>,
-    <code class="Nm">snl_send</code>, <code class="Nm">snl_get_seq</code>,
-    <code class="Nm">snl_allocz</code>, <code class="Nm">snl_clear_lb</code>,
-    <code class="Nm">snl_parse_nlmsg</code>,
-    <code class="Nm">snl_parse_header</code>,
-    <code class="Nm">snl_parse_attrs</code>,
-    <code class="Nm">snl_parse_attrs_raw</code>,
-    <code class="Nm">snl_attr_get_flag</code>,
-    <code class="Nm">snl_attr_get_ip</code>,
-    <code class="Nm">snl_attr_get_uint16</code>,
-    <code class="Nm">snl_attr_get_uint32</code>,
-    <code class="Nm">snl_attr_get_string</code>,
-    <code class="Nm">snl_attr_get_stringn</code>,
-    <code class="Nm">snl_attr_get_nla</code>,
-    <code class="Nm">snl_field_get_uint8</code>,
-    <code class="Nm">snl_field_get_uint16</code>,
-    <code class="Nm">snl_field_get_uint32</code> &#x2014;
-    <span class="Nd">simple netlink library</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
-    &lt;<a class="In">netlink/netlink_snl.h</a>&gt;</code>
-  <br/>
-  <code class="In">#include
-    &lt;<a class="In">netlink/netlink_snl_route.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_init</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">int
-    netlink_family</var>);</p>
-<p class="Pp"><code class="Fn">snl_free</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>);</p>
-<p class="Pp"><var class="Ft">struct nlmsghdr *</var>
-  <br/>
-  <code class="Fn">snl_read_message</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_send</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">void
-    *data</var>, <var class="Fa" style="white-space: nowrap;">int sz</var>);</p>
-<p class="Pp"><var class="Ft">uint32_t</var>
-  <br/>
-  <code class="Fn">snl_get_seq</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>);</p>
-<p class="Pp"><var class="Ft">void *</var>
-  <br/>
-  <code class="Fn">snl_allocz</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">int
-    len</var>);</p>
-<p class="Pp"><code class="Fn">snl_clear_lb</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_parse_nlmsg</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlmsghdr *hdr</var>, <var class="Fa" style="white-space: nowrap;">const
-    struct snl_hdr_parser *ps</var>,
-    <var class="Fa" style="white-space: nowrap;">void *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_parse_header</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">void
-    *hdr</var>, <var class="Fa" style="white-space: nowrap;">int len</var>,
-    <var class="Fa" style="white-space: nowrap;">const struct snl_hdr_parser
-    *ps</var>, <var class="Fa" style="white-space: nowrap;">int pslen</var>,
-    <var class="Fa" style="white-space: nowrap;">void *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_parse_attrs</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlmsghdr *hdr</var>, <var class="Fa" style="white-space: nowrap;">int
-    hdrlen</var>, <var class="Fa" style="white-space: nowrap;">const struct
-    snl_attr_parser *ps</var>, <var class="Fa" style="white-space: nowrap;">int
-    pslen</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_parse_attrs_raw</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla_head</var>, <var class="Fa" style="white-space: nowrap;">int
-    len</var>, <var class="Fa" style="white-space: nowrap;">const struct
-    snl_attr_parser *ps</var>, <var class="Fa" style="white-space: nowrap;">int
-    pslen</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_attr_get_flag</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_attr_get_uint8</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_attr_get_uint16</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_attr_get_uint32</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_attr_get_uint64</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_attr_get_string</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_attr_get_stringn</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_attr_get_nla</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_attr_get_ip</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">snl_attr_get_ipvia</code>(<var class="Fa" style="white-space: nowrap;">struct
-    snl_state *ss</var>, <var class="Fa" style="white-space: nowrap;">struct
-    nlattr *nla</var>, <var class="Fa" style="white-space: nowrap;">void
-    *target</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <a class="Xr">snl(3)</a> library provides an easy way of
-    sending and receiving Netlink messages, taking care of serialisation and
-    deserialisation.</p>
-<section class="Ss">
-<h2 class="Ss" id="INITIALISATION"><a class="permalink" href="#INITIALISATION">INITIALISATION</a></h2>
-<p class="Pp">Call
-    <a class="permalink" href="#snl_init"><code class="Fn" id="snl_init">snl_init</code></a>()
-    with a pointer to the <code class="Dv">struct snl_state</code> and the
-    desired Netlink family to initialise the library instance. To free the
-    library instance, call
-    <a class="permalink" href="#snl_free"><code class="Fn" id="snl_free">snl_free</code></a>().</p>
-<p class="Pp">The library functions are NOT multithread-safe. If multithreading
-    is desired, consider initializing an instance per thread.</p>
-</section>
-<section class="Ss">
-<h2 class="Ss" id="MEMORY_ALLOCATION"><a class="permalink" href="#MEMORY_ALLOCATION">MEMORY
-  ALLOCATION</a></h2>
-<p class="Pp">The library uses pre-allocated extendable memory buffers to handle
-    message parsing. The typical usage pattern is to allocate the necessary data
-    structures during the message parsing or writing process via
-    <a class="permalink" href="#snl_allocz"><code class="Fn" id="snl_allocz">snl_allocz</code></a>()
-    and free all allocated data at once using
-    <a class="permalink" href="#snl_clear_lb"><code class="Fn" id="snl_clear_lb">snl_clear_lb</code></a>()
-    after handling the message.</p>
-</section>
-<section class="Ss">
-<h2 class="Ss" id="COMPOSING_AND_SENDING_MESSAGES"><a class="permalink" href="#COMPOSING_AND_SENDING_MESSAGES">COMPOSING
-  AND SENDING MESSAGES</a></h2>
-<p class="Pp">The library does not currently offer any wrappers for writing
-    netlink messages. Simple request messages can be composed by filling in all
-    needed fields directly. Example for constructing an interface dump
-  request:</p>
-<div class="Bd Pp Li">
-<pre>	struct {
-		struct nlmsghdr hdr;
-		struct ifinfomsg ifmsg;
-	} msg = {
-		.hdr.nlmsg_type = RTM_GETLINK,
-		.hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
-		.hdr.nlmsg_seq = snl_get_seq(ss),
-	};
-	msg.hdr.nlmsg_len = sizeof(msg);</pre>
-</div>
-<a class="permalink" href="#snl_get_seq"><code class="Fn" id="snl_get_seq">snl_get_seq</code></a>()
-  can be used to generate a unique message number. To send the resulting
-  message,
-  <a class="permalink" href="#snl_send"><code class="Fn" id="snl_send">snl_send</code></a>()
-  can be used.
-</section>
-<section class="Ss">
-<h2 class="Ss" id="RECEIVING_AND_PARSING_MESSAGES"><a class="permalink" href="#RECEIVING_AND_PARSING_MESSAGES">RECEIVING
-  AND PARSING MESSAGES</a></h2>
-<p class="Pp">To receive a message, use
-    <a class="permalink" href="#snl_read_message"><code class="Fn" id="snl_read_message">snl_read_message</code></a>().
-    Currently, this call is blocking.</p>
-<p class="Pp" id="SNL_VERIFY_PARSERS">The library provides an easy way to
-    convert the message to the pre-defined C structure. For each message type,
-    one needs to define rules, converting the protocol header fields and the
-    desired attributes to the specified structure. It can be accomplished by
-    using message parsers. Each message parser consists of an array of attribute
-    getters and an array of header field getters. The former array needs to be
-    sorted by the attribute type. There is a
-    <a class="permalink" href="#SNL_VERIFY_PARSERS"><code class="Fn">SNL_VERIFY_PARSERS</code></a>()
-    macro to check if the order is correct.
-    <a class="permalink" href="#SNL_DECLARE_PARSER"><code class="Fn" id="SNL_DECLARE_PARSER">SNL_DECLARE_PARSER</code></a>(<var class="Fa">parser_name</var>,
-    <var class="Fa">family header type</var>, <var class="Fa">struct
-    snl_field_parser[]</var>, <var class="Fa">struct snl_attr_parser[]</var>)
-    can be used to create a new parser.
-    <a class="permalink" href="#SNL_DECLARE_ATTR_PARSER"><code class="Fn" id="SNL_DECLARE_ATTR_PARSER">SNL_DECLARE_ATTR_PARSER</code></a>(<var class="Fa">parser_name</var>,
-    <var class="Fa">struct snl_field_parser[]</var>) can be used to create an
-    attribute-only message parser.</p>
-<p class="Pp">Each attribute getter needs to be embedded in the following
-    structure:</p>
-<div class="Bd Pp Li">
-<pre>typedef bool snl_parse_attr_f(struct snl_state *ss, struct nlattr *attr, const void *arg, void *target);
-struct snl_attr_parser {
-	uint16_t		type;	/* Attribute type */
-	uint16_t		off;	/* field offset in the target structure */
-	snl_parse_attr_f	*cb;	/* getter function to call */
-	const void		*arg;	/* getter function custom argument */
-};</pre>
-</div>
-The generic attribute getter has the following signature:
-  <var class="Ft">bool</var>
-  <a class="permalink" href="#snl_attr_get__type_"><code class="Fn" id="snl_attr_get__type_">snl_attr_get_&lt;type&gt;</code></a>(<var class="Fa">struct
-  snl_state *ss</var>, <var class="Fa">struct nlattr *nla</var>,
-  <var class="Fa">const void *arg</var>, <var class="Fa">void *target</var>).
-  nla contains the pointer of the attribute to use as the datasource. The target
-  field is the pointer to the field in the target structure. It is up to the
-  getter to know the type of the target field. The getter must check the input
-  attribute and return false if the attribute is not formed correctly.
-  Otherwise, the getter fetches the attribute value and stores it in the target,
-  then returns true. It is possible to use <code class="Fn">snl_allocz</code>()
-  to create the desired data structure . A number of predefined getters for the
-  common data types exist.
-  <a class="permalink" href="#snl_attr_get_flag"><code class="Fn" id="snl_attr_get_flag">snl_attr_get_flag</code></a>()
-  converts a flag-type attribute to an uint8_t value of 1 or 0, depending on the
-  attribute presence.
-  <a class="permalink" href="#snl_attr_get_uint8"><code class="Fn" id="snl_attr_get_uint8">snl_attr_get_uint8</code></a>()
-  stores a uint8_t type attribute into the uint8_t target field.
-  <a class="permalink" href="#snl_attr_get_uint16"><code class="Fn" id="snl_attr_get_uint16">snl_attr_get_uint16</code></a>()
-  stores a uint16_t type attribute into the uint16_t target field.
-  <a class="permalink" href="#snl_attr_get_uint32"><code class="Fn" id="snl_attr_get_uint32">snl_attr_get_uint32</code></a>()
-  stores a uint32_t type attribute into the uint32_t target field.
-  <a class="permalink" href="#snl_attr_get_uint64"><code class="Fn" id="snl_attr_get_uint64">snl_attr_get_uint64</code></a>()
-  stores a uint64_t type attribute into the uint64_t target field.
-  <a class="permalink" href="#snl_attr_get_ip"><code class="Fn" id="snl_attr_get_ip">snl_attr_get_ip</code></a>()
-  and
-  <a class="permalink" href="#snl_attr_get_ipvia"><code class="Fn" id="snl_attr_get_ipvia">snl_attr_get_ipvia</code></a>()
-  stores a pointer to the sockaddr structure with the IPv4/IPv6 address
-  contained in the attribute. Sockaddr is allocated using
-  <code class="Fn">snl_allocz</code>().
-  <a class="permalink" href="#snl_attr_get_string"><code class="Fn" id="snl_attr_get_string">snl_attr_get_string</code></a>()
-  stores a pointer to the NULL-terminated string. The string itself is allocated
-  using <code class="Fn">snl_allocz</code>().
-  <a class="permalink" href="#snl_attr_get_nla"><code class="Fn" id="snl_attr_get_nla">snl_attr_get_nla</code></a>()
-  stores a pointer to the specified attribute.
-  <a class="permalink" href="#snl_attr_get_stringn"><code class="Fn" id="snl_attr_get_stringn">snl_attr_get_stringn</code></a>()
-  stores a pointer to the non-NULL-terminated string.
-<p class="Pp">Similarly, each family header getter needs to be embedded in the
-    following structure:</p>
-<div class="Bd Pp Li">
-<pre>typedef void snl_parse_field_f(struct snl_state *ss, void *hdr, void *target);
-struct snl_field_parser {
-	uint16_t		off_in;	/* field offset in the input structure */
-	uint16_t                off_out;/* field offset in the target structure */
-	snl_parse_field_f       *cb;	/* getter function to call */
-};</pre>
-</div>
-The generic field getter has the following signature: <var class="Ft">void</var>
-  snl_field_get_&lt;type&gt; &quot;struct snl_state *ss&quot; &quot;void
-  *src&quot; &quot;void *target&quot; . A number of pre-defined getters for the
-  common data types exist.
-  <a class="permalink" href="#snl_field_get_uint8"><code class="Fn" id="snl_field_get_uint8">snl_field_get_uint8</code></a>()
-  fetches an uint8_t value and stores it in the target.
-  <a class="permalink" href="#snl_field_get_uint16"><code class="Fn" id="snl_field_get_uint16">snl_field_get_uint16</code></a>()
-  fetches an uint8_t value and stores it in the target.
-  <a class="permalink" href="#snl_field_get_uint32"><code class="Fn" id="snl_field_get_uint32">snl_field_get_uint32</code></a>()
-  fetches an uint32_t value and stores it in the target.
-</section>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
-<p class="Pp">The following example demonstrates how to list all system
-    interfaces using netlink.</p>
-<div class="Bd Pp Li">
-<pre>#include &lt;stdio.h&gt;
-
-#include &lt;netlink/netlink.h&gt;
-#include &lt;netlink/netlink_route.h&gt;
-#include &quot;netlink/netlink_snl.h&quot;
-#include &quot;netlink/netlink_snl_route.h&quot;
-
-struct nl_parsed_link {
-	uint32_t		ifi_index;
-	uint32_t		ifla_mtu;
-	char			*ifla_ifname;
-};
-
-#define	_IN(_field)	offsetof(struct ifinfomsg, _field)
-#define	_OUT(_field)	offsetof(struct nl_parsed_link, _field)
-static const struct snl_attr_parser ap_link[] = {
-	{ .type = IFLA_IFNAME, .off = _OUT(ifla_ifname), .cb = snl_attr_get_string },
-	{ .type = IFLA_MTU, .off = _OUT(ifla_mtu), .cb = snl_attr_get_uint32 },
-};
-static const struct snl_field_parser fp_link[] = {
-	{.off_in = _IN(ifi_index), .off_out = _OUT(ifi_index), .cb = snl_field_get_uint32 },
-};
-#undef _IN
-#undef _OUT
-SNL_DECLARE_PARSER(link_parser, struct ifinfomsg, fp_link, ap_link);
-
-
-int
-main(int ac, char *argv[])
-{
-	struct snl_state ss;
-
-	if (!snl_init(&amp;ss, NETLINK_ROUTE))
-		return (1);
-
-	struct {
-		struct nlmsghdr hdr;
-		struct ifinfomsg ifmsg;
-	} msg = {
-		.hdr.nlmsg_type = RTM_GETLINK,
-		.hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
-		.hdr.nlmsg_seq = snl_get_seq(&amp;ss),
-	};
-	msg.hdr.nlmsg_len = sizeof(msg);
-
-	if (!snl_send(&amp;ss, &amp;msg, sizeof(msg))) {
-		snl_free(&amp;ss);
-		return (1);
-	}
-
-	struct nlmsghdr *hdr;
-	while ((hdr = snl_read_message(&amp;ss)) != NULL &amp;&amp; hdr-&gt;nlmsg_type != NLMSG_DONE) {
-		if (hdr-&gt;nlmsg_seq != msg.hdr.nlmsg_seq)
-			break;
-
-		struct nl_parsed_link link = {};
-		if (!snl_parse_nlmsg(&amp;ss, hdr, &amp;link_parser, &amp;link))
-			continue;
-		printf(&quot;Link#%u %s mtu %u\n&quot;, link.ifi_index, link.ifla_ifname, link.ifla_mtu);
-	}
-
-	return (0);
-}</pre>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
-  ALSO</a></h1>
-<p class="Pp"><a class="Xr">genetlink(4)</a>, <a class="Xr">netlink(4)</a>, and
-    <a class="Xr">rtnetlink(4)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Dv">SNL</code> library appeared in
-    <span class="Ux">FreeBSD 13.2</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">This library was implemented by <span class="An">Alexander
-    Chernikov</span>
-    &lt;<a class="Mt" href="mailto:melifaro@FreeBSD.org">melifaro@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
-  <tr>
-    <td class="foot-date">December 16, 2022</td>
-    <td class="foot-os">FreeBSD 15.0</td>
-  </tr>
-</table>