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| <title>lwIP: src/core/ipv4/dhcp.c File Reference</title> |
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| <div id="projectname">lwIP |
|  <span id="projectnumber">2.1.2</span> |
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| <div id="projectbrief">Lightweight IP stack</div> |
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| <div class="title">dhcp.c File Reference</div> </div> |
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| <div class="textblock"><code>#include "<a class="el" href="opt_8h.html">lwip/opt.h</a>"</code><br /> |
| <code>#include "<a class="el" href="stats_8h.html">lwip/stats.h</a>"</code><br /> |
| <code>#include "<a class="el" href="mem_8h.html">lwip/mem.h</a>"</code><br /> |
| <code>#include "<a class="el" href="udp_8h.html">lwip/udp.h</a>"</code><br /> |
| <code>#include "<a class="el" href="ip__addr_8h.html">lwip/ip_addr.h</a>"</code><br /> |
| <code>#include "<a class="el" href="netif_8h.html">lwip/netif.h</a>"</code><br /> |
| <code>#include "<a class="el" href="def_8h.html">lwip/def.h</a>"</code><br /> |
| <code>#include "<a class="el" href="dhcp_8h.html">lwip/dhcp.h</a>"</code><br /> |
| <code>#include "<a class="el" href="autoip_8h.html">lwip/autoip.h</a>"</code><br /> |
| <code>#include "<a class="el" href="dns_8h.html">lwip/dns.h</a>"</code><br /> |
| <code>#include "<a class="el" href="lwip_2etharp_8h.html">lwip/etharp.h</a>"</code><br /> |
| <code>#include "<a class="el" href="prot_2dhcp_8h.html">lwip/prot/dhcp.h</a>"</code><br /> |
| <code>#include "<a class="el" href="iana_8h.html">lwip/prot/iana.h</a>"</code><br /> |
| <code>#include <string.h></code><br /> |
| <code>#include "path/to/my/lwip_hooks.h"</code><br /> |
| </div><table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a> |
| Macros</h2></td></tr> |
| <tr class="memitem:ad6de9c5120654454a330bf5de53c4835"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#ad6de9c5120654454a330bf5de53c4835">DHCP_CREATE_RAND_XID</a>   1</td></tr> |
| <tr class="separator:ad6de9c5120654454a330bf5de53c4835"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a63e9ec4517b80d8576f218d905e31a9b"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a63e9ec4517b80d8576f218d905e31a9b">DHCP_MAX_MSG_LEN</a>(<a class="el" href="structnetif.html">netif</a>)   (<a class="el" href="structnetif.html">netif</a>->mtu)</td></tr> |
| <tr class="separator:a63e9ec4517b80d8576f218d905e31a9b"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:aa52c2b64ef42fbad84a3bcd58052caab"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#aa52c2b64ef42fbad84a3bcd58052caab">DHCP_MIN_REPLY_LEN</a>   44</td></tr> |
| <tr class="separator:aa52c2b64ef42fbad84a3bcd58052caab"><td class="memSeparator" colspan="2"> </td></tr> |
| </table><table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="enum-members"></a> |
| Enumerations</h2></td></tr> |
| <tr class="memitem:a8c3b584d223b995b48613ad96cb776a0"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a8c3b584d223b995b48613ad96cb776a0">dhcp_option_idx</a> </td></tr> |
| <tr class="separator:a8c3b584d223b995b48613ad96cb776a0"><td class="memSeparator" colspan="2"> </td></tr> |
| </table><table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a> |
| Functions</h2></td></tr> |
| <tr class="memitem:ad7480883d64f3d6f083c8aa933b5e3cb"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#ad7480883d64f3d6f083c8aa933b5e3cb">dhcp_coarse_tmr</a> (void)</td></tr> |
| <tr class="separator:ad7480883d64f3d6f083c8aa933b5e3cb"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a601d97faa24fa7289244bb452f052045"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a601d97faa24fa7289244bb452f052045">dhcp_fine_tmr</a> (void)</td></tr> |
| <tr class="separator:a601d97faa24fa7289244bb452f052045"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ga43812097832716a462c660eb59cc1bf8"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#ga43812097832716a462c660eb59cc1bf8">dhcp_set_struct</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>, struct dhcp *dhcp)</td></tr> |
| <tr class="separator:ga43812097832716a462c660eb59cc1bf8"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ga292a1b0c0c288ec508108a3fba473e64"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#ga292a1b0c0c288ec508108a3fba473e64">dhcp_cleanup</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:ga292a1b0c0c288ec508108a3fba473e64"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ga0c50968d9811aa2aa67fadc0885d744f"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#ga0c50968d9811aa2aa67fadc0885d744f">dhcp_start</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:ga0c50968d9811aa2aa67fadc0885d744f"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:gabd7fcc7e0799e313885fc7fd9d4992ad"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#gabd7fcc7e0799e313885fc7fd9d4992ad">dhcp_inform</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:gabd7fcc7e0799e313885fc7fd9d4992ad"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a04f3824720223c439165243527906002"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a04f3824720223c439165243527906002">dhcp_network_changed</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:a04f3824720223c439165243527906002"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a1fc0a94e0b94f13c5d302018f7ecb535"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a1fc0a94e0b94f13c5d302018f7ecb535">dhcp_arp_reply</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>, const <a class="el" href="ip4__addr_8h.html#a3d3b45daffbc15d65da236e31e621b7e">ip4_addr_t</a> *addr)</td></tr> |
| <tr class="separator:a1fc0a94e0b94f13c5d302018f7ecb535"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ga583eb8d58f5e96b7dea717948578a947"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#ga583eb8d58f5e96b7dea717948578a947">dhcp_renew</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:ga583eb8d58f5e96b7dea717948578a947"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:gaf7cd42b9f220446b6a597d3474da6ece"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#gaf7cd42b9f220446b6a597d3474da6ece">dhcp_release_and_stop</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:gaf7cd42b9f220446b6a597d3474da6ece"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:gaf92f7afb58252f82a749064602974bd4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#gaf92f7afb58252f82a749064602974bd4">dhcp_release</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:gaf92f7afb58252f82a749064602974bd4"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ga93f6bf21086dc9b10c0bec4676f97312"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#ga93f6bf21086dc9b10c0bec4676f97312">dhcp_stop</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:ga93f6bf21086dc9b10c0bec4676f97312"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ae24a2529372218327ab9cb6592041c85"><td class="memItemLeft" align="right" valign="top">u8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#ae24a2529372218327ab9cb6592041c85">dhcp_supplied_address</a> (const struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:ae24a2529372218327ab9cb6592041c85"><td class="memSeparator" colspan="2"> </td></tr> |
| </table><table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a> |
| Variables</h2></td></tr> |
| <tr class="memitem:a5abd232496063bddcbc6692c0e8f9c1f"><td class="memItemLeft" align="right" valign="top">u32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a5abd232496063bddcbc6692c0e8f9c1f">dhcp_rx_options_val</a> [DHCP_OPTION_IDX_MAX]</td></tr> |
| <tr class="separator:a5abd232496063bddcbc6692c0e8f9c1f"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a058b71e1d26b3758b29d16d9f892c8cc"><td class="memItemLeft" align="right" valign="top">u8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a058b71e1d26b3758b29d16d9f892c8cc">dhcp_rx_options_given</a> [DHCP_OPTION_IDX_MAX]</td></tr> |
| <tr class="separator:a058b71e1d26b3758b29d16d9f892c8cc"><td class="memSeparator" colspan="2"> </td></tr> |
| </table> |
| <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> |
| <div class="textblock"><p>Dynamic Host Configuration Protocol client </p> |
| </div><h2 class="groupheader">Macro Definition Documentation</h2> |
| <a id="ad6de9c5120654454a330bf5de53c4835"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#ad6de9c5120654454a330bf5de53c4835">◆ </a></span>DHCP_CREATE_RAND_XID</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">#define DHCP_CREATE_RAND_XID   1</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>DHCP_CREATE_RAND_XID: if this is set to 1, the xid is created using <a class="el" href="group__compiler__abstraction.html#ga77370c377781ee7489e30eaf772ea05a">LWIP_RAND()</a> (this overrides DHCP_GLOBAL_XID) </p> |
| |
| </div> |
| </div> |
| <a id="a63e9ec4517b80d8576f218d905e31a9b"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a63e9ec4517b80d8576f218d905e31a9b">◆ </a></span>DHCP_MAX_MSG_LEN</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">#define DHCP_MAX_MSG_LEN</td> |
| <td>(</td> |
| <td class="paramtype"> </td> |
| <td class="paramname"><a class="el" href="structnetif.html">netif</a></td><td>)</td> |
| <td>   (<a class="el" href="structnetif.html">netif</a>->mtu)</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Default for DHCP_GLOBAL_XID is 0xABCD0000 This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g. #define DHCP_GLOBAL_XID_HEADER "stdlib.h" #define DHCP_GLOBAL_XID rand() DHCP_OPTION_MAX_MSG_SIZE is set to the MTU MTU is checked to be big enough in dhcp_start </p> |
| |
| </div> |
| </div> |
| <a id="aa52c2b64ef42fbad84a3bcd58052caab"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#aa52c2b64ef42fbad84a3bcd58052caab">◆ </a></span>DHCP_MIN_REPLY_LEN</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">#define DHCP_MIN_REPLY_LEN   44</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Minimum length for reply before packet is parsed </p> |
| |
| </div> |
| </div> |
| <h2 class="groupheader">Enumeration Type Documentation</h2> |
| <a id="a8c3b584d223b995b48613ad96cb776a0"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a8c3b584d223b995b48613ad96cb776a0">◆ </a></span>dhcp_option_idx</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">enum <a class="el" href="dhcp_8c.html#a8c3b584d223b995b48613ad96cb776a0">dhcp_option_idx</a></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Option handling: options are parsed in dhcp_parse_reply and saved in an array where other functions can load them from. This might be moved into the struct dhcp (not necessarily since lwIP is single-threaded and the array is only used while in recv callback). </p> |
| |
| </div> |
| </div> |
| <h2 class="groupheader">Function Documentation</h2> |
| <a id="a1fc0a94e0b94f13c5d302018f7ecb535"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a1fc0a94e0b94f13c5d302018f7ecb535">◆ </a></span>dhcp_arp_reply()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">void dhcp_arp_reply </td> |
| <td>(</td> |
| <td class="paramtype">struct <a class="el" href="structnetif.html">netif</a> * </td> |
| <td class="paramname"><em>netif</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const <a class="el" href="ip4__addr_8h.html#a3d3b45daffbc15d65da236e31e621b7e">ip4_addr_t</a> * </td> |
| <td class="paramname"><em>addr</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Match an ARP reply with the offered IP address: check whether the offered IP address is not in use using ARP</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">netif</td><td>the network interface on which the reply was received </td></tr> |
| <tr><td class="paramname">addr</td><td>The IP address we received a reply from </td></tr> |
| </table> |
| </dd> |
| </dl> |
| |
| </div> |
| </div> |
| <a id="ad7480883d64f3d6f083c8aa933b5e3cb"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#ad7480883d64f3d6f083c8aa933b5e3cb">◆ </a></span>dhcp_coarse_tmr()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">void dhcp_coarse_tmr </td> |
| <td>(</td> |
| <td class="paramtype">void </td> |
| <td class="paramname"></td><td>)</td> |
| <td></td> |
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| <p>The DHCP timer that checks for lease renewal/rebind timeouts. Must be called once a minute (see <a class="el" href="dhcp_8h.html#a3751cc5daa0875d415ebacd8ad675f1e">DHCP_COARSE_TIMER_SECS</a>). </p> |
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| <a id="a601d97faa24fa7289244bb452f052045"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a601d97faa24fa7289244bb452f052045">◆ </a></span>dhcp_fine_tmr()</h2> |
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| <td class="memname">void dhcp_fine_tmr </td> |
| <td>(</td> |
| <td class="paramtype">void </td> |
| <td class="paramname"></td><td>)</td> |
| <td></td> |
| </tr> |
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| </div><div class="memdoc"> |
| <p>DHCP transaction timeout handling (this function must be called every 500ms, see <a class="el" href="dhcp_8h.html#a7a26209f52eebe8ded457ae141df403f">DHCP_FINE_TIMER_MSECS</a>).</p> |
| <p>A DHCP server is expected to respond within a short period of time. This timer checks whether an outstanding DHCP request is timed out. </p> |
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| <a id="a04f3824720223c439165243527906002"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a04f3824720223c439165243527906002">◆ </a></span>dhcp_network_changed()</h2> |
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| <td class="memname">void dhcp_network_changed </td> |
| <td>(</td> |
| <td class="paramtype">struct <a class="el" href="structnetif.html">netif</a> * </td> |
| <td class="paramname"><em>netif</em></td><td>)</td> |
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| <p>Handle a possible change in the network configuration.</p> |
| <p>This enters the REBOOTING state to verify that the currently bound address is still valid. </p> |
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| <a id="ae24a2529372218327ab9cb6592041c85"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#ae24a2529372218327ab9cb6592041c85">◆ </a></span>dhcp_supplied_address()</h2> |
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| <td class="memname">u8_t dhcp_supplied_address </td> |
| <td>(</td> |
| <td class="paramtype">const struct <a class="el" href="structnetif.html">netif</a> * </td> |
| <td class="paramname"><em>netif</em></td><td>)</td> |
| <td></td> |
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| <p>check if DHCP supplied netif-><a class="el" href="structip__addr.html">ip_addr</a></p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">netif</td><td>the netif to check </td></tr> |
| </table> |
| </dd> |
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| <dl class="section return"><dt>Returns</dt><dd>1 if DHCP supplied netif-><a class="el" href="structip__addr.html">ip_addr</a> (states BOUND or RENEWING), 0 otherwise </dd></dl> |
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| </div> |
| </div> |
| <h2 class="groupheader">Variable Documentation</h2> |
| <a id="a058b71e1d26b3758b29d16d9f892c8cc"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a058b71e1d26b3758b29d16d9f892c8cc">◆ </a></span>dhcp_rx_options_given</h2> |
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| <td class="memname">u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX]</td> |
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| </div><div class="memdoc"> |
| <p>Holds a flag which option was received and is contained in dhcp_rx_options_val, only valid while in dhcp_recv. </p> |
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| <a id="a5abd232496063bddcbc6692c0e8f9c1f"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a5abd232496063bddcbc6692c0e8f9c1f">◆ </a></span>dhcp_rx_options_val</h2> |
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| <td class="memname">u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX]</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Holds the decoded option values, only valid while in dhcp_recv. </p> |
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