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href="#cidr.is4">cidr:is4</a> ()</td> + <td class="summary"> + +Checks whether the CIDR instance is an IPv4 address range + </td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.is4rfc1918">cidr:is4rfc1918</a> ()</td> + <td class="summary"> + +Checks whether the CIDR instance is within the private RFC1918 address space + </td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.is4linklocal">cidr:is4linklocal</a> ()</td> + <td class="summary"> + +Checks whether the CIDR instance is an IPv4 link local (Zeroconf) address + </td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.is6">cidr:is6</a> ()</td> + <td class="summary"> + +Checks whether the CIDR instance is an IPv6 address range + </td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.is6linklocal">cidr:is6linklocal</a> ()</td> + <td class="summary"> + +Checks whether the CIDR instance is an IPv6 link local address + </td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.is6mapped4">cidr:is6mapped4</a> ()</td> + <td class="summary"> + +Checks whether the CIDR instance is an IPv6 mapped IPv4 address + </td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.ismac">cidr:ismac</a> ()</td> + <td class="summary"> + +Checks whether the CIDR instance is an ethernet MAC address range + </td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.ismaclocal">cidr:ismaclocal</a> ()</td> + <td class="summary"> + +Checks whether the CIDR instance is a locally administered (LAA) MAC address + </td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.ismacmcast">cidr:ismacmcast</a> ()</td> + <td class="summary"> + +Checks whether the CIDR instance is a multicast MAC address + </td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.lower">cidr:lower</a> (addr)</td> + <td class="summary"> + +Checks whether this CIDR instance is lower than the given argument.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.higher">cidr:higher</a> (addr)</td> + <td class="summary"> + +Checks whether this CIDR instance is higher than the given argument.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.equal">cidr:equal</a> (addr)</td> + <td class="summary"> + +Checks whether this CIDR instance is equal to the given argument.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.prefix">cidr:prefix</a> (mask)</td> + <td class="summary"> + +Get or set prefix size of CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.network">cidr:network</a> (mask)</td> + <td class="summary"> + +Derive network address of CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.host">cidr:host</a> ()</td> + <td class="summary"> + +Derive host address of CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.mask">cidr:mask</a> (mask)</td> + <td class="summary"> + +Derive netmask of CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.broadcast">cidr:broadcast</a> (mask)</td> + <td class="summary"> + +Derive broadcast address of CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.mapped4">cidr:mapped4</a> ()</td> + <td class="summary"> + +Derive mapped IPv4 address of CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.tomac">cidr:tomac</a> ()</td> + <td class="summary"> + +Derive MAC address of IPv6 link local CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.tolinklocal">cidr:tolinklocal</a> ()</td> + <td class="summary"> + +Derive IPv6 link local address from MAC address CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.contains">cidr:contains</a> (addr)</td> + <td class="summary"> + +Test whether CIDR contains given range.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.add">cidr:add</a> (amount, inplace)</td> + <td class="summary"> + +Add given amount to CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.sub">cidr:sub</a> (amount, inplace)</td> + <td class="summary"> + +Subtract given amount from CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.minhost">cidr:minhost</a> ()</td> + <td class="summary"> + +Calculate the lowest possible host address within this CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.maxhost">cidr:maxhost</a> ()</td> + <td class="summary"> + +Calculate the highest possible host address within this CIDR instance.</td> + </tr> + + <tr> + <td class="name" nowrap><a href="#cidr.string">cidr:string</a> ()</td> + <td class="summary"> + +Convert CIDR instance into string representation.</td> + </tr> + +</table> + + + + + + +<br/> +<br/> + + +<h2><a name="functions"></a>Functions</h2> +<dl class="function"> + + + +<dt><a name="cidr.is4"></a><strong>cidr:is4</strong> ()</dt> +<dd> + + +Checks whether the CIDR instance is an IPv4 address range + + + + + + + + +<h3>Return value:</h3> +<code>true</code> if the CIDR is an IPv4 range, else <code>false</code> + + + +<h3>See also:</h3> +<ul> + + <li><a href="#cidr.is6"> + cidr:is6 + </a> + + <li><a href="#cidr.ismac"> + cidr:ismac + </a> + +</ul> + +</dd> + + + + +<dt><a name="cidr.is4rfc1918"></a><strong>cidr:is4rfc1918</strong> ()</dt> +<dd> + + +Checks whether the CIDR instance is within the private RFC1918 address space + + + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("192.168.45.2/24") +if addr:is4rfc1918() then + print("Is a private address") +end</pre> + + + +<h3>Return value:</h3> +<code>true</code> if the entire range of this CIDR lies within one of + the ranges <code>10.0.0.0-10.255.255.255</code>, + <code>172.16.0.0-172.31.0.0</code> or + <code>192.168.0.0-192.168.255.255</code>, else <code>false</code>. + + + +</dd> + + + + +<dt><a name="cidr.is4linklocal"></a><strong>cidr:is4linklocal</strong> ()</dt> +<dd> + + +Checks whether the CIDR instance is an IPv4 link local (Zeroconf) address + + + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("169.254.34.125") +if addr:is4linklocal() then + print("Is a zeroconf address") +end</pre> + + + +<h3>Return value:</h3> +<code>true</code> if the entire range of this CIDR lies within the range + the range <code>169.254.0.0-169.254.255.255</code>, else <code>false</code>. + + + +</dd> + + + + +<dt><a name="cidr.is6"></a><strong>cidr:is6</strong> ()</dt> +<dd> + + +Checks whether the CIDR instance is an IPv6 address range + + + + + + + + +<h3>Return value:</h3> +<code>true</code> if the CIDR is an IPv6 range, else <code>false</code> + + + +<h3>See also:</h3> +<ul> + + <li><a href="#cidr.is4"> + cidr:is4 + </a> + + <li><a href="#cidr.ismac"> + cidr:ismac + </a> + +</ul> + +</dd> + + + + +<dt><a name="cidr.is6linklocal"></a><strong>cidr:is6linklocal</strong> ()</dt> +<dd> + + +Checks whether the CIDR instance is an IPv6 link local address + + + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("fe92:53a:3216:af01:221:63ff:fe75:aa17/64") +if addr:is6linklocal() then + print("Is a linklocal address") +end</pre> + + + +<h3>Return value:</h3> +<code>true</code> if the entire range of this CIDR lies within the range + the <code>fe80::/10</code> range, else <code>false</code>. + + + +</dd> + + + + +<dt><a name="cidr.is6mapped4"></a><strong>cidr:is6mapped4</strong> ()</dt> +<dd> + + +Checks whether the CIDR instance is an IPv6 mapped IPv4 address + + + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("::ffff:192.168.1.1") +if addr:is6mapped4() then + print("Is a mapped IPv4 address") +end</pre> + + + +<h3>Return value:</h3> +<code>true</code> if the address is an IPv6 mapped IPv4 address in the + form <code>::ffff:1.2.3.4</code>. + + + +</dd> + + + + +<dt><a name="cidr.ismac"></a><strong>cidr:ismac</strong> ()</dt> +<dd> + + +Checks whether the CIDR instance is an ethernet MAC address range + + + + + + + + +<h3>Return value:</h3> +<code>true</code> if the CIDR is a MAC address range, else <code>false</code> + + + +<h3>See also:</h3> +<ul> + + <li><a href="#cidr.is4"> + cidr:is4 + </a> + + <li><a href="#cidr.is6"> + cidr:is6 + </a> + +</ul> + +</dd> + + + + +<dt><a name="cidr.ismaclocal"></a><strong>cidr:ismaclocal</strong> ()</dt> +<dd> + + +Checks whether the CIDR instance is a locally administered (LAA) MAC address + + + + + + +<h3>Usage:</h3> +<pre>local mac = luci.ip.new("02:C0:FF:EE:00:01") +if mac:ismaclocal() then + print("Is an LAA MAC address") +end</pre> + + + +<h3>Return value:</h3> +<code>true</code> if the MAC address sets the locally administered bit. + + + +</dd> + + + + +<dt><a name="cidr.ismacmcast"></a><strong>cidr:ismacmcast</strong> ()</dt> +<dd> + + +Checks whether the CIDR instance is a multicast MAC address + + + + + + +<h3>Usage:</h3> +<pre>local mac = luci.ip.new("01:00:5E:7F:00:10") +if addr:ismacmcast() then + print("Is a multicast MAC address") +end</pre> + + + +<h3>Return value:</h3> +<code>true</code> if the MAC address sets the multicast bit. + + + +</dd> + + + + +<dt><a name="cidr.lower"></a><strong>cidr:lower</strong> (addr)</dt> +<dd> + + +Checks whether this CIDR instance is lower than the given argument. +The comparisation follows these rules: +<ul><li>An IPv4 address is always lower than an IPv6 address and IPv6 addresses +are considered lower than MAC addresses</li> +<li>Prefix sizes are ignored</li></ul> + + + +<h3>Parameters</h3> +<ul> + + <li> + addr: A <code>luci.ip.cidr</code> instance or a string convertible by + <code>luci.ip.new()</code> to compare against. + </li> + +</ul> + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("192.168.1.1") +print(addr:lower(addr)) -- false +print(addr:lower("10.10.10.10/24")) -- false +print(addr:lower(luci.ip.new("::1"))) -- true +print(addr:lower(luci.ip.new("192.168.200.1"))) -- true +print(addr:lower(luci.ip.new("00:14:22:01:23:45"))) -- true</pre> + + + +<h3>Return value:</h3> +<code>true</code> if this CIDR is lower than the given address, + else <code>false</code>. + + + +<h3>See also:</h3> +<ul> + + <li><a href="#cidr.higher"> + cidr:higher + </a> + + <li><a href="#cidr.equal"> + cidr:equal + </a> + +</ul> + +</dd> + + + + +<dt><a name="cidr.higher"></a><strong>cidr:higher</strong> (addr)</dt> +<dd> + + +Checks whether this CIDR instance is higher than the given argument. +The comparisation follows these rules: +<ul><li>An IPv4 address is always lower than an IPv6 address and IPv6 addresses +are considered lower than MAC addresses</li> +<li>Prefix sizes are ignored</li></ul> + + + +<h3>Parameters</h3> +<ul> + + <li> + addr: A <code>luci.ip.cidr</code> instance or a string convertible by + <code>luci.ip.new()</code> to compare against. + </li> + +</ul> + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("192.168.1.1") +print(addr:higher(addr)) -- false +print(addr:higher("10.10.10.10/24")) -- true +print(addr:higher(luci.ip.new("::1"))) -- false +print(addr:higher(luci.ip.new("192.168.200.1"))) -- false +print(addr:higher(luci.ip.new("00:14:22:01:23:45"))) -- false</pre> + + + +<h3>Return value:</h3> +<code>true</code> if this CIDR is higher than the given address, + else <code>false</code>. + + + +<h3>See also:</h3> +<ul> + + <li><a href="#cidr.lower"> + cidr:lower + </a> + + <li><a href="#cidr.equal"> + cidr:equal + </a> + +</ul> + +</dd> + + + + +<dt><a name="cidr.equal"></a><strong>cidr:equal</strong> (addr)</dt> +<dd> + + +Checks whether this CIDR instance is equal to the given argument. + + + +<h3>Parameters</h3> +<ul> + + <li> + addr: A <code>luci.ip.cidr</code> instance or a string convertible by + <code>luci.ip.new()</code> to compare against. + </li> + +</ul> + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("192.168.1.1") +print(addr:equal(addr)) -- true +print(addr:equal("192.168.1.1")) -- true +print(addr:equal(luci.ip.new("::1"))) -- false + +local addr6 = luci.ip.new("::1") +print(addr6:equal("0:0:0:0:0:0:0:1/64")) -- true +print(addr6:equal(luci.ip.new("fe80::221:63ff:fe75:aa17"))) -- false + +local mac = luci.ip.new("00:14:22:01:23:45") +print(mac:equal("0:14:22:1:23:45")) -- true +print(mac:equal(luci.ip.new("01:23:45:67:89:AB")) -- false</pre> + + + +<h3>Return value:</h3> +<code>true</code> if this CIDR is equal to the given address, + else <code>false</code>. + + + +<h3>See also:</h3> +<ul> + + <li><a href="#cidr.lower"> + cidr:lower + </a> + + <li><a href="#cidr.higher"> + cidr:higher + </a> + +</ul> + +</dd> + + + + +<dt><a name="cidr.prefix"></a><strong>cidr:prefix</strong> (mask)</dt> +<dd> + + +Get or set prefix size of CIDR instance. +If the optional mask parameter is given, the prefix size of this CIDR is altered +else the current prefix size is returned. + + + +<h3>Parameters</h3> +<ul> + + <li> + mask: Either a number containing the number of bits (<code>0..32</code> + for IPv4, <code>0..128</code> for IPv6 or <code>0..48</code> for MAC addresses) or a string + containing a valid netmask (optional) + </li> + +</ul> + + + + +<h3>Usage:</h3> +<pre>local range = luci.ip.new("192.168.1.1/255.255.255.0") +print(range:prefix()) -- 24 + +range:prefix(16) +print(range:prefix()) -- 16 + +range:prefix("255.255.255.255") +print(range:prefix()) -- 32</pre> + + + +<h3>Return value:</h3> +Bit count of the current prefix size + + + +</dd> + + + + +<dt><a name="cidr.network"></a><strong>cidr:network</strong> (mask)</dt> +<dd> + + +Derive network address of CIDR instance. + +Returns a new CIDR instance representing the network address of this instance +with all host parts masked out. The used prefix size can be overridden by the +optional mask parameter. + + + +<h3>Parameters</h3> +<ul> + + <li> + mask: Either a number containing the number of bits (<code>0..32</code> + for IPv4, <code>0..128</code> for IPv6 or <code>0..48</code> for MAC addresses) or a string + containing a valid netmask (optional) + </li> + +</ul> + + + + +<h3>Usage:</h3> +<pre>local range = luci.ip.new("192.168.62.243/255.255.0.0") +print(range:network()) -- "192.168.0.0" +print(range:network(24)) -- "192.168.62.0" +print(range:network("255.255.255.0")) -- "192.168.62.0" + +local range6 = luci.ip.new("fd9b:62b3:9cc5:0:221:63ff:fe75:aa17/64") +print(range6:network()) -- "fd9b:62b3:9cc5::"</pre> + + + +<h3>Return value:</h3> +CIDR instance representing the network address + + + +</dd> + + + + +<dt><a name="cidr.host"></a><strong>cidr:host</strong> ()</dt> +<dd> + + +Derive host address of CIDR instance. + +This function essentially constructs a copy of this CIDR with the prefix size +set to <code>32</code> for IPv4, <code>128</code> for IPv6 or <code>48</code> for MAC addresses. + + + + + + +<h3>Usage:</h3> +<pre>local range = luci.ip.new("172.19.37.45/16") +print(range) -- "172.19.37.45/16" +print(range:host()) -- "172.19.37.45"</pre> + + + +<h3>Return value:</h3> +CIDR instance representing the host address + + + +</dd> + + + + +<dt><a name="cidr.mask"></a><strong>cidr:mask</strong> (mask)</dt> +<dd> + + +Derive netmask of CIDR instance. + +Constructs a CIDR instance representing the netmask of this instance. The used +prefix size can be overridden by the optional mask parameter. + + + +<h3>Parameters</h3> +<ul> + + <li> + mask: Either a number containing the number of bits (<code>0..32</code> + for IPv4, <code>0..128</code> for IPv6 or <code>0..48</code> for MAC addresses) or a string + containing a valid netmask (optional) + </li> + +</ul> + + + + +<h3>Usage:</h3> +<pre>local range = luci.ip.new("172.19.37.45/16") +print(range:mask()) -- "255.255.0.0" +print(range:mask(24)) -- "255.255.255.0" +print(range:mask("255.0.0.0")) -- "255.0.0.0"</pre> + + + +<h3>Return value:</h3> +CIDR instance representing the netmask + + + +</dd> + + + + +<dt><a name="cidr.broadcast"></a><strong>cidr:broadcast</strong> (mask)</dt> +<dd> + + +Derive broadcast address of CIDR instance. + +Constructs a CIDR instance representing the broadcast address of this instance. +The used prefix size can be overridden by the optional mask parameter. + +This function has no effect on IPv6 or MAC address instances, it will return +nothing in this case. + + + +<h3>Parameters</h3> +<ul> + + <li> + mask: Either a number containing the number of bits (<code>0..32</code> for IPv4) or + a string containing a valid netmask (optional) + </li> + +</ul> + + + + +<h3>Usage:</h3> +<pre>local range = luci.ip.new("172.19.37.45/16") +print(range:broadcast()) -- "172.19.255.255" +print(range:broadcast(24)) -- "172.19.37.255" +print(range:broadcast("255.0.0.0")) -- "172.255.255.255"</pre> + + + +<h3>Return value:</h3> +Return a new CIDR instance representing the broadcast address if this + instance is an IPv4 range, else return nothing. + + + +</dd> + + + + +<dt><a name="cidr.mapped4"></a><strong>cidr:mapped4</strong> ()</dt> +<dd> + + +Derive mapped IPv4 address of CIDR instance. + +Constructs a CIDR instance representing the IPv4 address of the IPv6 mapped +IPv4 address in this instance. + +This function has no effect on IPv4 instances, MAC address instances or IPv6 +instances which are not a mapped address, it will return nothing in this case. + + + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("::ffff:172.16.19.1") +print(addr:mapped4()) -- "172.16.19.1"</pre> + + + +<h3>Return value:</h3> +Return a new CIDR instance representing the IPv4 address if this + instance is an IPv6 mapped IPv4 address, else return nothing. + + + +</dd> + + + + +<dt><a name="cidr.tomac"></a><strong>cidr:tomac</strong> ()</dt> +<dd> + + +Derive MAC address of IPv6 link local CIDR instance. + +Constructs a CIDR instance representing the MAC address contained in the IPv6 +link local address of this instance. + +This function has no effect on IPv4 instances, MAC address instances or IPv6 +instances which are not a link local address, it will return nothing in this +case. + + + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("fe80::6666:b3ff:fe47:e1b9") +print(addr:tomac()) -- "64:66:B3:47:E1:B9"</pre> + + + +<h3>Return value:</h3> +Return a new CIDR instance representing the MAC address if this + instance is an IPv6 link local address, else return nothing. + + + +</dd> + + + + +<dt><a name="cidr.tolinklocal"></a><strong>cidr:tolinklocal</strong> ()</dt> +<dd> + + +Derive IPv6 link local address from MAC address CIDR instance. + +Constructs a CIDR instance representing the IPv6 link local address of the +MAC address represented by this instance. + +This function has no effect on IPv4 instances or IPv6 instances, it will return +nothing in this case. + + + + + + +<h3>Usage:</h3> +<pre>local mac = luci.ip.new("64:66:B3:47:E1:B9") +print(mac:tolinklocal()) -- "fe80::6666:b3ff:fe47:e1b9"</pre> + + + +<h3>Return value:</h3> +Return a new CIDR instance representing the IPv6 link local address. + + + +</dd> + + + + +<dt><a name="cidr.contains"></a><strong>cidr:contains</strong> (addr)</dt> +<dd> + + +Test whether CIDR contains given range. + + + +<h3>Parameters</h3> +<ul> + + <li> + addr: A <code>luci.ip.cidr</code> instance or a string convertible by + <code>luci.ip.new()</code> to test. + </li> + +</ul> + + + + +<h3>Usage:</h3> +<pre>local range = luci.ip.new("10.24.0.0/255.255.0.0") +print(range:contains("10.24.5.1")) -- true +print(range:contains("::1")) -- false +print(range:contains("10.0.0.0/8")) -- false + +local range6 = luci.ip.new("fe80::/10") +print(range6:contains("fe80::221:63f:fe75:aa17/64")) -- true +print(range6:contains("fd9b:6b3:c5:0:221:63f:fe75:aa17/64")) -- false + +local intel_macs = luci.ip.MAC("C0:B6:F9:00:00:00/24") +print(intel_macs:contains("C0:B6:F9:A3:C:11")) -- true +print(intel_macs:contains("64:66:B3:47:E1:B9")) -- false</pre> + + + +<h3>Return value:</h3> +<code>true</code> if this instance fully contains the given address else + <code>false</code>. + + + +</dd> + + + + +<dt><a name="cidr.add"></a><strong>cidr:add</strong> (amount, inplace)</dt> +<dd> + + +Add given amount to CIDR instance. If the result would overflow the maximum +address space, the result is set to the highest possible address. + + + +<h3>Parameters</h3> +<ul> + + <li> + amount: A numeric value between 0 and 0xFFFFFFFF, a + <code>luci.ip.cidr</code> instance or a string convertible by + <code>luci.ip.new()</code>. + </li> + + <li> + inplace: If <code>true</code>, modify this instance instead of returning + a new derived CIDR instance. + </li> + +</ul> + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("192.168.1.1/24") +print(addr:add(250)) -- "192.168.1.251/24" +print(addr:add("0.0.99.0")) -- "192.168.100.1/24" + +addr:add(256, true) -- true +print(addr) -- "192.168.2.1/24 + +addr:add("255.0.0.0", true) -- false (overflow) +print(addr) -- "255.255.255.255/24 + +local addr6 = luci.ip.new("fe80::221:63f:fe75:aa17/64") +print(addr6:add(256)) -- "fe80::221:63f:fe75:ab17/64" +print(addr6:add("::ffff:0")) -- "fe80::221:640:fe74:aa17/64" + +addr6:add(256, true) -- true +print(addr6) -- "fe80::221:63f:fe75:ab17/64 + +addr6:add("ffff::", true) -- false (overflow) +print(addr6) -- "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/64" + +local mac = luci.ip.new("00:14:22:01:23:45") +print(mac:add(256)) -- "00:14:22:01:24:45" +print(mac:add("0:0:0:0:FF:0") -- "00:14:22:02:22:45" + +mac:add(256, true) -- true +print(mac) -- "00:14:22:01:24:45" + +mac:add("FF:FF:0:0:0:0", true) -- false (overflow) +print(mac) -- "FF:FF:FF:FF:FF:FF"</pre> + + + +<h3>Return value:</h3> +<ul> + <li>When adding inplace: Return <code>true</code> if the addition succeeded + or <code>false</code> when the addition overflowed.</li> + <li>When deriving new CIDR: Return new instance representing the value of + this instance plus the added amount or the highest possible address if + the addition overflowed the available address space.</li></ul> + + + +</dd> + + + + +<dt><a name="cidr.sub"></a><strong>cidr:sub</strong> (amount, inplace)</dt> +<dd> + + +Subtract given amount from CIDR instance. If the result would under, the lowest +possible address is returned. + + + +<h3>Parameters</h3> +<ul> + + <li> + amount: A numeric value between 0 and 0xFFFFFFFF, a + <code>luci.ip.cidr</code> instance or a string convertible by + <code>luci.ip.new()</code>. + </li> + + <li> + inplace: If <code>true</code>, modify this instance instead of returning + a new derived CIDR instance. + </li> + +</ul> + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("192.168.1.1/24") +print(addr:sub(256)) -- "192.168.0.1/24" +print(addr:sub("0.168.0.0")) -- "192.0.1.1/24" + +addr:sub(256, true) -- true +print(addr) -- "192.168.0.1/24 + +addr:sub("255.0.0.0", true) -- false (underflow) +print(addr) -- "0.0.0.0/24 + +local addr6 = luci.ip.new("fe80::221:63f:fe75:aa17/64") +print(addr6:sub(256)) -- "fe80::221:63f:fe75:a917/64" +print(addr6:sub("::ffff:0")) -- "fe80::221:63e:fe76:aa17/64" + +addr:sub(256, true) -- true +print(addr) -- "fe80::221:63f:fe75:a917/64" + +addr:sub("ffff::", true) -- false (underflow) +print(addr) -- "::/64" + +local mac = luci.ip.new("00:14:22:01:23:45") +print(mac:sub(256)) -- "00:14:22:01:22:45" +print(mac:sub("0:0:0:0:FF:0") -- "00:14:22:00:24:45" + +mac:sub(256, true) -- true +print(mac) -- "00:14:22:01:22:45" + +mac:sub("FF:FF:0:0:0:0", true) -- false (overflow) +print(mac) -- "00:00:00:00:00:00"</pre> + + + +<h3>Return value:</h3> +<ul> + <li>When subtracting inplace: Return <code>true</code> if the subtraction + succeeded or <code>false</code> when the subtraction underflowed.</li> + <li>When deriving new CIDR: Return new instance representing the value of + this instance minus the subtracted amount or the lowest address if + the subtraction underflowed.</li></ul> + + + +</dd> + + + + +<dt><a name="cidr.minhost"></a><strong>cidr:minhost</strong> ()</dt> +<dd> + + +Calculate the lowest possible host address within this CIDR instance. + + + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("192.168.123.56/24") +print(addr:minhost()) -- "192.168.123.1" + +local addr6 = luci.ip.new("fd9b:62b3:9cc5:0:221:63ff:fe75:aa17/64") +print(addr6:minhost()) -- "fd9b:62b3:9cc5::1" + +local mac = luci.ip.new("00:14:22:01:22:45/32") +print(mac:minhost()) -- "00:14:22:01:00:01"</pre> + + + +<h3>Return value:</h3> +Returns a new CIDR instance representing the lowest host address + within this range. + + + +</dd> + + + + +<dt><a name="cidr.maxhost"></a><strong>cidr:maxhost</strong> ()</dt> +<dd> + + +Calculate the highest possible host address within this CIDR instance. + + + + + + +<h3>Usage:</h3> +<pre>local addr = luci.ip.new("192.168.123.56/24") +print(addr:maxhost()) -- "192.168.123.254" (.255 is broadcast) + +local addr6 = luci.ip.new("fd9b:62b3:9cc5:0:221:63ff:fe75:aa17/64") +print(addr6:maxhost()) -- "fd9b:62b3:9cc5:0:ffff:ffff:ffff:ffff" + +local mac = luci.ip.new("00:14:22:01:22:45/32") +print(mac:maxhost()) -- "00:14:22:01:FF:FF"</pre> + + + +<h3>Return value:</h3> +Returns a new CIDR instance representing the highest host address + within this range. + + + +</dd> + + + + +<dt><a name="cidr.string"></a><strong>cidr:string</strong> ()</dt> +<dd> + + +Convert CIDR instance into string representation. + +If the prefix size of instance is less than 32 for IPv4, 128 for IPv6 or 48 for +MACs, the address is returned in the form "address/prefix" otherwise just +"address". + +It is usually not required to call this function directly as CIDR objects +define it as __tostring function in the associated metatable. + + + + + + + + +<h3>Return value:</h3> +Returns a string representing the range or address of this CIDR instance + + + +</dd> + + +</dl> + + + + + +</div> <!-- id="content" --> + +</div> <!-- id="main" --> + +<div id="about"> + <p><a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-xhtml10" alt="Valid XHTML 1.0!" height="31" width="88" /></a></p> +</div> <!-- id="about" --> + +</div> <!-- id="container" --> +</body> +</html> |