jahway603
/
libreCMC
ответвлено от libreCMC/libreCMC


			
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<h1>Class <code>luci.ip</code></h1>

<p>
 LuCI IP calculation and netlink access library.</p>


<h2>Functions</h2>
<table class="function_list">

	<tr>
	<td class="name" nowrap><a href="#new">new</a>&nbsp;(address, netmask)</td>
	<td class="summary">
 
Construct a new luci.ip.cidr instance and autodetect the address family.</td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#IPv4">IPv4</a>&nbsp;(address, netmask)</td>
	<td class="summary">
 
Construct a new IPv4 luci.ip.cidr instance.</td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#IPv6">IPv6</a>&nbsp;(address, netmask)</td>
	<td class="summary">
 
Construct a new IPv6 luci.ip.cidr instance.</td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#MAC">MAC</a>&nbsp;(address, netmask)</td>
	<td class="summary">
 
Construct a new MAC luci.ip.cidr instance.</td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#checkip4">checkip4</a>&nbsp;(address)</td>
	<td class="summary">
 
Verify an IPv4 address.</td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#checkip6">checkip6</a>&nbsp;(address)</td>
	<td class="summary">
 
Verify an IPv6 address.</td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#checkmac">checkmac</a>&nbsp;(address)</td>
	<td class="summary">
 
Verify an ethernet MAC address.</td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#route">route</a>&nbsp;(address, source)</td>
	<td class="summary">
 
Determine the route leading to the given destination.</td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#routes">routes</a>&nbsp;(filter, callback)</td>
	<td class="summary">
 
Fetch all routes, optionally matching the given criteria.</td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#neighbors">neighbors</a>&nbsp;(filter, callback)</td>
	<td class="summary">
 
Fetches entries from the IPv4 ARP and IPv6 neighbour kernel table </td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#link">link</a>&nbsp;(device)</td>
	<td class="summary">
 
Fetch basic device information </td>
	</tr>

</table>


<br/>
<br/>


<h2><a name="functions"></a>Functions</h2>
<dl class="function">


<dt><a name="new"></a><strong>new</strong>&nbsp;(address, netmask)</dt>
<dd>

 
Construct a new luci.ip.cidr instance and autodetect the address family. 
Throws an error if the given strings do not represent a valid address or 
if the given optional netmask is of a different family.


<h3>Parameters</h3>
<ul>
	
	<li>
	  address: String containing a valid IPv4 or IPv6 address, optionally 
with prefix size (CIDR notation) or netmask separated by slash.
	</li>
	
	<li>
	  netmask: String containing a valid IPv4 or IPv6 netmask or number 
containing a prefix size in bits (<code>0..32</code> for IPv4, 
<code>0..128</code> for IPv6). Overrides mask embedded in the first argument 
if specified. (optional)
	</li>
	
</ul>


<h3>Usage:</h3>
<pre>addr = luci.ip.new("10.24.0.1/24") 
addr = luci.ip.new("10.24.0.1/255.255.255.0") 
addr = luci.ip.new("10.24.0.1", "255.255.255.0")        -- separate netmask 
addr = luci.ip.new("10.24.0.1/24", 16)                  -- override netmask 
 
addr6 = luci.ip.new("fe80::221:63ff:fe75:aa17/64") 
addr6 = luci.ip.new("fe80::221:63ff:fe75:aa17/ffff:ffff:ffff:ffff::") 
addr6 = luci.ip.new("fe80::221:63ff:fe75:aa17", "ffff:ffff:ffff:ffff::") 
addr6 = luci.ip.new("fe80::221:63ff:fe75:aa17/64", 128) -- override netmask</pre>


<h3>Return value:</h3>
A <code>luci.ip.cidr</code> object representing the given 
address/mask range.


<h3>See also:</h3>
<ul>
	
	<li><a href="#IPv4">
		IPv4
	</a>
	
	<li><a href="#IPv6">
		IPv6
	</a>
	
	<li><a href="#MAC">
		MAC
	</a>
	
</ul>

</dd>


<dt><a name="IPv4"></a><strong>IPv4</strong>&nbsp;(address, netmask)</dt>
<dd>

 
Construct a new IPv4 luci.ip.cidr instance. 
Throws an error if the given string does not represent a valid IPv4 address or 
if the given optional netmask is of a different family.


<h3>Parameters</h3>
<ul>
	
	<li>
	  address: String containing a valid IPv4, optionally with prefix size 
(CIDR notation) or netmask separated by slash.
	</li>
	
	<li>
	  netmask: String containing a valid IPv4 netmask or number 
containing a prefix size between <code>0</code> and <code>32</code> bit. 
Overrides mask embedded in the first argument if specified. (optional)
	</li>
	
</ul>


<h3>Usage:</h3>
<pre>addr = luci.ip.IPv4("10.24.0.1/24") 
addr = luci.ip.IPv4("10.24.0.1/255.255.255.0") 
addr = luci.ip.IPv4("10.24.0.1", "255.255.255.0")        -- separate netmask 
addr = luci.ip.IPv4("10.24.0.1/24", 16)                  -- override netmask</pre>


<h3>Return value:</h3>
A <code>luci.ip.cidr</code> object representing the given IPv4 range.


<h3>See also:</h3>
<ul>
	
	<li><a href="#IPv6">
		IPv6
	</a>
	
	<li><a href="#MAC">
		MAC
	</a>
	
</ul>

</dd>


<dt><a name="IPv6"></a><strong>IPv6</strong>&nbsp;(address, netmask)</dt>
<dd>

 
Construct a new IPv6 luci.ip.cidr instance. 
Throws an error if the given string does not represent a valid IPv6 address or 
if the given optional netmask is of a different family.


<h3>Parameters</h3>
<ul>
	
	<li>
	  address: String containing a valid IPv6, optionally with prefix size 
(CIDR notation) or netmask separated by slash.
	</li>
	
	<li>
	  netmask: String containing a valid IPv4 netmask or number 
containing a prefix size between <code>0</code> and <code>128</code> bit. 
Overrides mask embedded in the first argument if specified. (optional)
	</li>
	
</ul>


<h3>Usage:</h3>
<pre>addr6 = luci.ip.IPv6("fe80::221:63ff:fe75:aa17/64") 
addr6 = luci.ip.IPv6("fe80::221:63ff:fe75:aa17/ffff:ffff:ffff:ffff::") 
addr6 = luci.ip.IPv6("fe80::221:63ff:fe75:aa17", "ffff:ffff:ffff:ffff::") 
addr6 = luci.ip.IPv6("fe80::221:63ff:fe75:aa17/64", 128) -- override netmask</pre>


<h3>Return value:</h3>
A <code>luci.ip.cidr</code> object representing the given IPv6 range.


<h3>See also:</h3>
<ul>
	
	<li><a href="#IPv4">
		IPv4
	</a>
	
	<li><a href="#MAC">
		MAC
	</a>
	
</ul>

</dd>


<dt><a name="MAC"></a><strong>MAC</strong>&nbsp;(address, netmask)</dt>
<dd>

 
Construct a new MAC luci.ip.cidr instance. 
Throws an error if the given string does not represent a valid ethernet MAC 
address or if the given optional mask is of a different family.


<h3>Parameters</h3>
<ul>
	
	<li>
	  address: String containing a valid ethernet MAC address, optionally with 
prefix size (CIDR notation) or mask separated by slash.
	</li>
	
	<li>
	  netmask: String containing a valid MAC address mask or number 
containing a prefix size between <code>0</code> and <code>48</code> bit. 
Overrides mask embedded in the first argument if specified. (optional)
	</li>
	
</ul>


<h3>Usage:</h3>
<pre>intel_macs = luci.ip.MAC("C0:B6:F9:00:00:00/24") 
intel_macs = luci.ip.MAC("C0:B6:F9:00:00:00/FF:FF:FF:0:0:0") 
intel_macs = luci.ip.MAC("C0:B6:F9:00:00:00", "FF:FF:FF:0:0:0") 
intel_macs = luci.ip.MAC("C0:B6:F9:00:00:00/24", 48) -- override mask</pre>


<h3>Return value:</h3>
A <code>luci.ip.cidr</code> object representing the given MAC address range.


<h3>See also:</h3>
<ul>
	
	<li><a href="#IPv4">
		IPv4
	</a>
	
	<li><a href="#IPv6">
		IPv6
	</a>
	
</ul>

</dd>


<dt><a name="checkip4"></a><strong>checkip4</strong>&nbsp;(address)</dt>
<dd>

 
Verify an IPv4 address. 
 
Checks whether given argument is a preexisting luci.ip.cidr IPv4 address 
instance or a string literal convertible to an IPv4 address and returns a 
plain Lua string containing the canonical representation of the address. 
 
If the argument is not a valid address, returns nothing. This function is 
intended to aid in safely verifying address literals without having to deal 
with exceptions.


<h3>Parameters</h3>
<ul>
	
	<li>
	  address: String containing a valid IPv4 address or existing 
luci.ip.cidr IPv4 instance.
	</li>
	
</ul>


<h3>Usage:</h3>
<pre>ipv4 = luci.ip.checkip4(luci.ip.new("127.0.0.1"))  -- "127.0.0.1" 
ipv4 = luci.ip.checkip4("127.0.0.1")               -- "127.0.0.1" 
ipv4 = luci.ip.checkip4("nonesense")               -- nothing 
ipv4 = luci.ip.checkip4(123)                       -- nothing 
ipv4 = luci.ip.checkip4(nil)                       -- nothing 
ipv4 = luci.ip.checkip4()                          -- nothing</pre>


<h3>Return value:</h3>
A string representing the given IPv4 address.


<h3>See also:</h3>
<ul>
	
	<li><a href="#checkip6">
		checkip6
	</a>
	
	<li><a href="#checkmac">
		checkmac
	</a>
	
</ul>

</dd>


<dt><a name="checkip6"></a><strong>checkip6</strong>&nbsp;(address)</dt>
<dd>

 
Verify an IPv6 address. 
 
Checks whether given argument is a preexisting luci.ip.cidr IPv6 address 
instance or a string literal convertible to an IPv6 address and returns a 
plain Lua string containing the canonical representation of the address. 
 
If the argument is not a valid address, returns nothing. This function is 
intended to aid in safely verifying address literals without having to deal 
with exceptions.


<h3>Parameters</h3>
<ul>
	
	<li>
	  address: String containing a valid IPv6 address or existing 
luci.ip.cidr IPv6 instance.
	</li>
	
</ul>


<h3>Usage:</h3>
<pre>ipv6 = luci.ip.checkip6(luci.ip.new("0:0:0:0:0:0:0:1"))  -- "::1" 
ipv6 = luci.ip.checkip6("0:0:0:0:0:0:0:1")               -- "::1" 
ipv6 = luci.ip.checkip6("nonesense")                     -- nothing 
ipv6 = luci.ip.checkip6(123)                             -- nothing 
ipv6 = luci.ip.checkip6(nil)                             -- nothing 
ipv6 = luci.ip.checkip6()                                -- nothing</pre>


<h3>Return value:</h3>
A string representing the given IPv6 address.


<h3>See also:</h3>
<ul>
	
	<li><a href="#checkip4">
		checkip4
	</a>
	
	<li><a href="#checkmac">
		checkmac
	</a>
	
</ul>

</dd>


<dt><a name="checkmac"></a><strong>checkmac</strong>&nbsp;(address)</dt>
<dd>

 
Verify an ethernet MAC address. 
 
Checks whether given argument is a preexisting luci.ip.cidr MAC address 
instance or a string literal convertible to an ethernet MAC and returns a 
plain Lua string containing the canonical representation of the address. 
 
If the argument is not a valid address, returns nothing. This function is 
intended to aid in safely verifying address literals without having to deal 
with exceptions.


<h3>Parameters</h3>
<ul>
	
	<li>
	  address: String containing a valid MAC address or existing luci.ip.cidr 
MAC address instance.
	</li>
	
</ul>


<h3>Usage:</h3>
<pre>mac = luci.ip.checkmac(luci.ip.new("00-11-22-cc-dd-ee"))  -- "00:11:22:CC:DD:EE" 
mac = luci.ip.checkmac("00:11:22:cc:dd:ee")               -- "00:11:22:CC:DD:EE" 
mac = luci.ip.checkmac("nonesense")                       -- nothing 
mac = luci.ip.checkmac(123)                               -- nothing 
mac = luci.ip.checkmac(nil)                               -- nothing 
mac = luci.ip.checkmac()                                  -- nothing</pre>


<h3>Return value:</h3>
A string representing the given MAC address.


<h3>See also:</h3>
<ul>
	
	<li><a href="#checkip4">
		checkip4
	</a>
	
	<li><a href="#checkip6">
		checkip6
	</a>
	
</ul>

</dd>


<dt><a name="route"></a><strong>route</strong>&nbsp;(address, source)</dt>
<dd>

 
Determine the route leading to the given destination.


<h3>Parameters</h3>
<ul>
	
	<li>
	  address: A <code>luci.ip.cidr</code> instance or a string containing 
a valid IPv4 or IPv6 range as specified by <code>luci.ip.new()</code>.
	</li>
	
	<li>
	  source: A <code>luci.ip.cidr</code> instance or a string containing 
the preferred source address for route selection (optional).
	</li>
	
</ul>


<h3>Usage:</h3>
<ul> 
<li>Find default gateway by getting route to Google's public NS server 
<pre>rt = luci.ip.route("8.8.8.8") 
if rt ~= nil then 
	print("gateway is", rt.gw) 
end</pre></li> 
<li>Determine IPv6 upstream interface <pre>rt = luci.ip.route("2001::/7") 
if rt ~= nil then 
	print("ipv6 upstream device is", rt.dev) 
end</pre></li> 
</ul>


<h3>Return value:</h3>
<p>Table containing the fields described below.</p> 
<table id="routetable"> 
<tr><th>Field</th><th>Description</th></tr> 
<tr><td><code>type</code><td> 
  <p>Route type with one of the following numeric values:</p> 
  <table> 
  <tr> 
	<td><code>1</code></td> 
	<td><code>RTN_UNICAST</code> - Gateway or direct route</td> 
  </tr> 
  <tr> 
	<td><code>2</code></td> 
	<td><code>RTN_LOCAL</code> - Accept locally</td> 
  </tr> 
  <tr> 
	<td><code>3</code></td> 
	<td><code>RTN_BROADCAST</code> - 
	    Accept locally as broadcast send as broadcast</td> 
  </tr> 
  <tr> 
	<td><code>4</code></td> 
	<td><code>RTN_ANYCAST</code> - 
        Accept locally as broadcast but send as unicast</td> 
  </tr> 
  <tr> 
	<td><code>5</code></td> 
	<td><code>RTN_MULTICAST</code> - Multicast route</td> 
  </tr> 
  </table> 
</td></tr> 
<tr> 
  <td><code>family</code></td> 
  <td>Number containing the route family, <code>4</code> for IPv4 or 
      <code>6</code> for IPv6</td> 
</tr> 
<tr> 
  <td><code>dest</code></td> 
  <td>Destination <code>luci.ip.cidr</code> instance</td> 
</tr> 
<tr> 
  <td><code>gw</code></td> 
  <td>Gateway <code>luci.ip.cidr</code> instance (optional)</td> 
</tr> 
<tr> 
  <td><code>from</code></td> 
  <td>Source address <code>luci.ip.cidr</code> instance (optional)</td> 
</tr> 
<tr> 
  <td><code>src</code></td> 
  <td>Preferred source <code>luci.ip.cidr</code> instance (optional)</td> 
</tr> 
<tr> 
  <td><code>dev</code></td> 
  <td>String containing the name of the outgoing interface</td> 
</tr> 
<tr> 
  <td><code>iif</code></td> 
  <td>String containing the name of the incoming interface (optional)</td> 
</tr> 
<tr> 
  <td><code>table</code></td> 
  <td>Number of the associated routing table (<code>0..65535</code>)</td> 
</tr> 
<tr> 
  <td><code>proto</code></td> 
  <td>Number of the associated routing protocol</td> 
</tr> 
<tr> 
  <td><code>scope</code></td> 
  <td>Number describing the scope of the route, most commonly 
      <code>0</code> for global or <code>253</code> for on-link</td> 
</tr> 
<tr> 
  <td><code>metric</code></td> 
  <td>Number describing the route metric (optional)</td> 
</tr> 
<tr> 
  <td><code>expires</code></td> 
  <td>Number of seconds the prefix is valid (IPv6 only, optional)</td> 
</tr> 
<tr> 
  <td><code>error</code></td> 
  <td>Route destination error code (optional)</td> 
</tr> 
</table>


<h3>See also:</h3>
<ul>
	
	<li><a href="#routes">
		routes
	</a>
	
</ul>

</dd>


<dt><a name="routes"></a><strong>routes</strong>&nbsp;(filter, callback)</dt>
<dd>

 
Fetch all routes, optionally matching the given criteria.


<h3>Parameters</h3>
<ul>
	
	<li>
	  filter: <p>Table containing one or more of the possible filter 
criteria described below (optional)</p><table> 
<tr><th>Field</th><th>Description</th></tr> 
<tr><td><code>family</code></td><td> 
 Number describing the address family to return - <code>4</code> selects 
 IPv4 routes, <code>6</code> IPv6 ones. Any other value selects both. 
</td></tr> 
<tr><td><code>iif</code></td><td> 
 String containing the incoming route interface to match. 
</td></tr> 
<tr><td><code>oif</code></td><td> 
 String containing the outgoing route interface to match. 
</td></tr> 
<tr><td><code>type</code></td><td> 
 Numeric type to match, e.g. <code>1</code> for unicast. 
</td></tr> 
<tr><td><code>scope</code></td><td> 
 Numeric scope to match, e.g. <code>253</code> for onlink. 
</td></tr> 
<tr><td><code>proto</code></td><td> 
 Numeric protocol to match, e.g. <code>2</code> for boot. 
</td></tr> 
<tr><td><code>table</code></td><td> 
 Numeric routing table to match (<code>0..65535</code>). 
</td></tr> 
<tr><td><code>gw</code></td><td> 
 String containing the gateway address to match. Can be in any notation 
 specified by <code>luci.ip.new()</code>. Prefix matching is performed when 
 comparing the routes, e.g. "192.168.1.0/24" would select routes with gateway 
 addresses <code>192.168.1.1 .. 192.168.1.255</code>. 
</td></tr> 
<tr><td><code>dest</code></td><td> 
 String containing the destination to match. Prefix matching is performed. 
</td></tr> 
<tr><td><code>from</code></td><td> 
 String containing the source address to match. Prefix matching is performed. 
</td></tr> 
<tr><td><code>src</code></td><td> 
 String containing the preferred source address to match. 
 Prefix matching is performed. 
</td></tr> 
<tr><td><code>dest_exact</code></td><td> 
 String containing the destination to match. Exact matching is performed, 
 e.g. <code>dest = "0.0.0.0/0"</code> would match <em>any</em> IPv4 route 
 while <code>dest_exact = "0.0.0.0/0"</code> will <em>only</em> match the 
 default route. 
</td></tr> 
<tr><td><code>from_exact</code></td><td> 
 String containing the source address to match. Exact matching is performed. 
</td></tr> 
</table>
	</li>
	
	<li>
	  callback: <p>Callback function to invoke for each found route 
instead of returning one table of route objects (optional)</p>
	</li>
	
</ul>


<h3>Usage:</h3>
<ul> 
<li>Find all IPv4 default routes: 
<pre>luci.ip.routes({ dest_exact = "0.0.0.0/0" }, function(rt) 
	print(rt.type, rt.gw, rt.dev) 
end)</pre></li> 
<li>Find all global IPv6 prefixes on the current system: 
<pre>luci.ip.routes({ from = "2001::/7" }, function(rt) 
	print(rt.from) 
end)</pre></li> 
<li>Fetch all IPv4 routes: 
<pre>routes = luci.ip.routes({ family = 4 }) 
for _, rt in ipairs(routes) do 
	print(rt.dest, rt.gw, rt.dev) 
end</pre></li> 
</ul>


<h3>Return value:</h3>
If no callback function is provided, a table of routes 
<a href="#routetable">as specified by <code>luci.ip.route()</code></a> 
is returned. If a callback function is given, it is invoked for each route 
and nothing is returned.


<h3>See also:</h3>
<ul>
	
	<li><a href="#route">
		route
	</a>
	
</ul>

</dd>


<dt><a name="neighbors"></a><strong>neighbors</strong>&nbsp;(filter, callback)</dt>
<dd>

 
Fetches entries from the IPv4 ARP and IPv6 neighbour kernel table


<h3>Parameters</h3>
<ul>
	
	<li>
	  filter: <p>Table containing one or more of the possible filter 
criteria described below (optional)</p><table> 
<tr><th>Field</th><th>Description</th></tr> 
<tr><td><code>family</code></td><td> 
 Number describing the address family to return - <code>4</code> selects 
 IPv4 ARP, <code>6</code> select IPv6 neighbour entries. Any other value 
 selects both. 
</td></tr> 
<tr><td><code>dev</code></td><td> 
 String containing the associated interface to match. 
</td></tr> 
<tr><td><code>dest</code></td><td> 
 String containing the associated address to match. Can be in any notation 
 specified by <code>luci.ip.new()</code>. Prefix matching is performed when 
 comparing the addresses, e.g. "192.168.1.0/24" would select ARP entries 
 for <code>192.168.1.1 .. 192.168.1.255</code>. 
</td></tr> 
<tr><td><code>mac</code></td><td> 
 String containing MAC address to match. 
</td></tr> 
</table>
	</li>
	
	<li>
	  callback: <p>Callback function to invoke for each found neighbour 
entry instead of returning one table of neighbour entries (optional)</p>
	</li>
	
</ul>


<h3>Usage:</h3>
<ul> 
<li>Find all ARP neighbours in the LAN: 
<pre>luci.ip.neighbors({ dest = "192.168.0.0/16" }, function(n) 
	print(n.dest, n.mac) 
end)</pre></li> 
<li>Find all active IPv6 addresses of host with given MAC: 
<pre>luci.ip.neighbors({ family = 6, mac = "00:21:63:75:aa:17" }, 
	function(n) 
		print(n.dest) 
	end)</pre></li> 
</ul>


<h3>Return value:</h3>
If no callback function is provided, a table of neighbour entries 
is returned. If a callback function is given, it is invoked for each entry 
and nothing is returned. 
 
A neighbour entry is a table containing the following fields: 
 
<table> 
<tr><th>Field</th><th>Description</th></tr> 
<tr> 
  <td><code>family</code></td> 
  <td>Number containing the neighbour entry family, <code>4</code> for IPv4 
      ARP or <code>6</code> for IPv6 NDP</td> 
</tr> 
<tr> 
  <td><code>dev</code></td> 
  <td>String containing the associated device of the neighbour entry</td> 
</tr> 
<tr> 
  <td><code>dest</code></td> 
  <td>IP address <code>luci.ip.cidr</code> instance</td> 
</tr> 
<tr> 
  <td><code>mac</code></td> 
  <td>MAC address <code>luci.ip.cidr</code> instance</td> 
</tr> 
<tr> 
  <td><code>router</code></td> 
  <td>Boolean "true" if the neighbour entry is a router (IPv6, optional)</td> 
</tr> 
<tr> 
  <td><code>proxy</code></td> 
  <td>Boolean "true" if this is a proxy entry (optional)</td> 
</tr> 
<tr> 
  <td><code>incomplete</code></td> 
  <td>Boolean "true" if the entry is in incomplete state (optional)</td> 
</tr> 
<tr> 
  <td><code>reachable</code></td> 
  <td>Boolean "true" if the entry is in reachable state (optional)</td> 
</tr> 
<tr> 
  <td><code>stale</code></td> 
  <td>Boolean "true" if the entry is stale (optional)</td> 
</tr> 
<tr> 
  <td><code>delay</code></td> 
  <td>Boolean "true" if the entry is delayed (optional)</td> 
</tr> 
<tr> 
  <td><code>probe</code></td> 
  <td>Boolean "true" if the entry is in probe state (optional)</td> 
</tr> 
<tr> 
  <td><code>failed</code></td> 
  <td>Boolean "true" if the entry is in failed state (optional)</td> 
</tr> 
<tr> 
  <td><code>noarp</code></td> 
  <td>Boolean "true" if the entry is not caused by NDP or 
      ARP (optional)</td> 
</tr> 
<tr> 
  <td><code>permanent</code></td> 
  <td>Boolean "true" if the entry was statically configured from 
      userspace (optional)</td> 
</tr> 
</table>


</dd>


<dt><a name="link"></a><strong>link</strong>&nbsp;(device)</dt>
<dd>

 
Fetch basic device information


<h3>Parameters</h3>
<ul>
	
	<li>
	  device: String containing the network device to query
	</li>
	
</ul>


<h3>Usage:</h3>
<ul> 
<li>Test whether device br-lan exists: 
<pre>print(luci.ip.link("br-lan").name ~= nil) 
</pre></li> 
<li>Query MAC address of eth0: 
<pre>print(luci.ip.link("eth0").mac) 
</pre></li> 
</ul>


<h3>Return value:</h3>
If the given interface is found, a table containing the fields 
described below is returned, else an empty table. 
 
<table> 
<tr><th>Field</th><th>Description</th></tr> 
<tr> 
  <td><code>up</code></td> 
  <td>Boolean indicating whether the device is in IFF_RUNNING state</td> 
</tr> 
<tr> 
  <td><code>type</code></td> 
  <td>Numeric value indicating the type of the device, e.g. <code>1</code> 
      for ethernet.</td> 
</tr> 
<tr> 
  <td><code>name</code></td> 
  <td>String containing the name of the device</td> 
</tr> 
<tr> 
  <td><code>master</code></td> 
  <td>If queried device is a bridge port, string containing the name of 
      parent bridge device (optional)</td> 
</tr> 
<tr> 
  <td><code>mtu</code></td> 
  <td>Number containing the current MTU of the device</td> 
</tr> 
<tr> 
  <td><code>qlen</code></td> 
  <td>Number containing the TX queue length of the device</td> 
</tr> 
<tr> 
  <td><code>mac</code></td> 
  <td>MAC address <code>luci.ip.cidr</code> instance representing the device ethernet 
      address</td> 
</tr> 
</table>


</dd>


</dl>


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