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| <div id="projectname">lwIP |
|  <span id="projectnumber">2.1.2</span> |
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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="lwip_2etharp_8h.html">lwip/etharp.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="snmp_8h.html">lwip/snmp.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="iana_8h.html">lwip/prot/iana.h</a>"</code><br /> |
| <code>#include "<a class="el" href="netif_2ethernet_8h.html">netif/ethernet.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:ac71515a6f140b25de49e9bf432b2bb2a"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="etharp_8c.html#ac71515a6f140b25de49e9bf432b2bb2a">ARP_AGE_REREQUEST_USED_UNICAST</a>   (<a class="el" href="group__lwip__opts__arp.html#ga741a0710dc126ed3ae9e305472df3432">ARP_MAXAGE</a> - 30)</td></tr> |
| <tr class="separator:ac71515a6f140b25de49e9bf432b2bb2a"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a0a03fea13e060da5a53a10a75a96def9"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="etharp_8c.html#a0a03fea13e060da5a53a10a75a96def9">ARP_MAXPENDING</a>   5</td></tr> |
| <tr class="separator:a0a03fea13e060da5a53a10a75a96def9"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a96f8787ca623e704da1d32ca7dd6d6d9"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="etharp_8c.html#a96f8787ca623e704da1d32ca7dd6d6d9">ETHARP_FLAG_TRY_HARD</a>   1</td></tr> |
| <tr class="separator:a96f8787ca623e704da1d32ca7dd6d6d9"><td class="memSeparator" colspan="2"> </td></tr> |
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| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="enum-members"></a> |
| Enumerations</h2></td></tr> |
| <tr class="memitem:ae95dee9363e6d3417298e07380b2d383"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="etharp_8c.html#ae95dee9363e6d3417298e07380b2d383">etharp_state</a> </td></tr> |
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| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a> |
| Functions</h2></td></tr> |
| <tr class="memitem:a654f4dad71f7e2bc4820094648f37a26"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="etharp_8c.html#a654f4dad71f7e2bc4820094648f37a26">etharp_tmr</a> (void)</td></tr> |
| <tr class="separator:a654f4dad71f7e2bc4820094648f37a26"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ae94677a2a5f3698276027c7475f6ca05"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="etharp_8c.html#ae94677a2a5f3698276027c7475f6ca05">etharp_cleanup_netif</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:ae94677a2a5f3698276027c7475f6ca05"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a0f8ca87c5472fa165763c8c38b76174c"><td class="memItemLeft" align="right" valign="top">ssize_t </td><td class="memItemRight" valign="bottom"><a class="el" href="etharp_8c.html#a0f8ca87c5472fa165763c8c38b76174c">etharp_find_addr</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> *ipaddr, struct <a class="el" href="structeth__addr.html">eth_addr</a> **eth_ret, const <a class="el" href="ip4__addr_8h.html#a3d3b45daffbc15d65da236e31e621b7e">ip4_addr_t</a> **ip_ret)</td></tr> |
| <tr class="separator:a0f8ca87c5472fa165763c8c38b76174c"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ab93df7ccb26496100d45137541e863c8"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="etharp_8c.html#ab93df7ccb26496100d45137541e863c8">etharp_get_entry</a> (size_t i, <a class="el" href="ip4__addr_8h.html#a3d3b45daffbc15d65da236e31e621b7e">ip4_addr_t</a> **ipaddr, struct <a class="el" href="structnetif.html">netif</a> **<a class="el" href="structnetif.html">netif</a>, struct <a class="el" href="structeth__addr.html">eth_addr</a> **eth_ret)</td></tr> |
| <tr class="separator:ab93df7ccb26496100d45137541e863c8"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a540a5506979693ef9ac4496db9bfa7d6"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="etharp_8c.html#a540a5506979693ef9ac4496db9bfa7d6">etharp_input</a> (struct <a class="el" href="structpbuf.html">pbuf</a> *p, struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr> |
| <tr class="separator:a540a5506979693ef9ac4496db9bfa7d6"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a19258c75a3778b6ed0c82f63a419502d"><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="etharp_8c.html#a19258c75a3778b6ed0c82f63a419502d">etharp_output</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>, struct <a class="el" href="structpbuf.html">pbuf</a> *q, const <a class="el" href="ip4__addr_8h.html#a3d3b45daffbc15d65da236e31e621b7e">ip4_addr_t</a> *ipaddr)</td></tr> |
| <tr class="separator:a19258c75a3778b6ed0c82f63a419502d"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ae180772e31346a0afeb707ad172dd19c"><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="etharp_8c.html#ae180772e31346a0afeb707ad172dd19c">etharp_query</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> *ipaddr, struct <a class="el" href="structpbuf.html">pbuf</a> *q)</td></tr> |
| <tr class="separator:ae180772e31346a0afeb707ad172dd19c"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a3e56faced96841e615f88dd57d1b2b15"><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="etharp_8c.html#a3e56faced96841e615f88dd57d1b2b15">etharp_request</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> *ipaddr)</td></tr> |
| <tr class="separator:a3e56faced96841e615f88dd57d1b2b15"><td class="memSeparator" colspan="2"> </td></tr> |
| </table> |
| <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> |
| <div class="textblock"><p>Address Resolution Protocol module for IP over Ethernet</p> |
| <p>Functionally, ARP is divided into two parts. The first maps an IP address to a physical address when sending a packet, and the second part answers requests from other machines for our physical address.</p> |
| <p>This implementation complies with RFC 826 (Ethernet ARP). It supports Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6 if an interface calls <a class="el" href="lwip_2etharp_8h.html#a83947dea159baf3420922084072e631e">etharp_gratuitous(our_netif)</a> upon address change. </p> |
| </div><h2 class="groupheader">Macro Definition Documentation</h2> |
| <a id="ac71515a6f140b25de49e9bf432b2bb2a"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#ac71515a6f140b25de49e9bf432b2bb2a">◆ </a></span>ARP_AGE_REREQUEST_USED_UNICAST</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">#define ARP_AGE_REREQUEST_USED_UNICAST   (<a class="el" href="group__lwip__opts__arp.html#ga741a0710dc126ed3ae9e305472df3432">ARP_MAXAGE</a> - 30)</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Re-request a used ARP entry 1 minute before it would expire to prevent breaking a steadily used connection because the ARP entry timed out. </p> |
| |
| </div> |
| </div> |
| <a id="a0a03fea13e060da5a53a10a75a96def9"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a0a03fea13e060da5a53a10a75a96def9">◆ </a></span>ARP_MAXPENDING</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">#define ARP_MAXPENDING   5</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>the time an ARP entry stays pending after first request, for ARP_TMR_INTERVAL = 1000, this is 10 seconds. </p> |
| |
| </div> |
| </div> |
| <a id="a96f8787ca623e704da1d32ca7dd6d6d9"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a96f8787ca623e704da1d32ca7dd6d6d9">◆ </a></span>ETHARP_FLAG_TRY_HARD</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">#define ETHARP_FLAG_TRY_HARD   1</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Try hard to create a new entry - we want the IP address to appear in the cache (even if this means removing an active entry or so). </p> |
| |
| </div> |
| </div> |
| <h2 class="groupheader">Enumeration Type Documentation</h2> |
| <a id="ae95dee9363e6d3417298e07380b2d383"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#ae95dee9363e6d3417298e07380b2d383">◆ </a></span>etharp_state</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">enum <a class="el" href="etharp_8c.html#ae95dee9363e6d3417298e07380b2d383">etharp_state</a></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>ARP states </p> |
| |
| </div> |
| </div> |
| <h2 class="groupheader">Function Documentation</h2> |
| <a id="ae94677a2a5f3698276027c7475f6ca05"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#ae94677a2a5f3698276027c7475f6ca05">◆ </a></span>etharp_cleanup_netif()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">void etharp_cleanup_netif </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> |
| <td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Remove all ARP table entries of the specified netif.</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">netif</td><td>points to a network interface </td></tr> |
| </table> |
| </dd> |
| </dl> |
| |
| </div> |
| </div> |
| <a id="a0f8ca87c5472fa165763c8c38b76174c"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a0f8ca87c5472fa165763c8c38b76174c">◆ </a></span>etharp_find_addr()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">ssize_t etharp_find_addr </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>ipaddr</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">struct <a class="el" href="structeth__addr.html">eth_addr</a> ** </td> |
| <td class="paramname"><em>eth_ret</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>ip_ret</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Finds (stable) ethernet/IP address pair from ARP table using interface and IP address index. </p><dl class="section note"><dt>Note</dt><dd>the addresses in the ARP table are in network order!</dd></dl> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">netif</td><td>points to interface index </td></tr> |
| <tr><td class="paramname">ipaddr</td><td>points to the (network order) IP address index </td></tr> |
| <tr><td class="paramname">eth_ret</td><td>points to return pointer </td></tr> |
| <tr><td class="paramname">ip_ret</td><td>points to return pointer </td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section return"><dt>Returns</dt><dd>table index if found, -1 otherwise </dd></dl> |
| |
| </div> |
| </div> |
| <a id="ab93df7ccb26496100d45137541e863c8"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#ab93df7ccb26496100d45137541e863c8">◆ </a></span>etharp_get_entry()</h2> |
| |
| <div class="memitem"> |
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| <td class="memname">int etharp_get_entry </td> |
| <td>(</td> |
| <td class="paramtype">size_t </td> |
| <td class="paramname"><em>i</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype"><a class="el" href="ip4__addr_8h.html#a3d3b45daffbc15d65da236e31e621b7e">ip4_addr_t</a> ** </td> |
| <td class="paramname"><em>ipaddr</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></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">struct <a class="el" href="structeth__addr.html">eth_addr</a> ** </td> |
| <td class="paramname"><em>eth_ret</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Possibility to iterate over stable ARP table entries</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">i</td><td>entry number, 0 to ARP_TABLE_SIZE </td></tr> |
| <tr><td class="paramname">ipaddr</td><td>return value: IP address </td></tr> |
| <tr><td class="paramname">netif</td><td>return value: points to interface </td></tr> |
| <tr><td class="paramname">eth_ret</td><td>return value: ETH address </td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section return"><dt>Returns</dt><dd>1 on valid index, 0 otherwise </dd></dl> |
| |
| </div> |
| </div> |
| <a id="a540a5506979693ef9ac4496db9bfa7d6"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a540a5506979693ef9ac4496db9bfa7d6">◆ </a></span>etharp_input()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">void etharp_input </td> |
| <td>(</td> |
| <td class="paramtype">struct <a class="el" href="structpbuf.html">pbuf</a> * </td> |
| <td class="paramname"><em>p</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></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></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Responds to ARP requests to us. Upon ARP replies to us, add entry to cache send out queued IP packets. Updates cache with snooped address pairs.</p> |
| <p>Should be called for incoming ARP packets. The pbuf in the argument is freed by this function.</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">p</td><td>The ARP packet that arrived on netif. Is freed by this function. </td></tr> |
| <tr><td class="paramname">netif</td><td>The lwIP network interface on which the ARP packet pbuf arrived.</td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section see"><dt>See also</dt><dd><a class="el" href="group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free()</a> </dd></dl> |
| |
| </div> |
| </div> |
| <a id="a19258c75a3778b6ed0c82f63a419502d"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a19258c75a3778b6ed0c82f63a419502d">◆ </a></span>etharp_output()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname"><a class="el" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> etharp_output </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">struct <a class="el" href="structpbuf.html">pbuf</a> * </td> |
| <td class="paramname"><em>q</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>ipaddr</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Resolve and fill-in Ethernet address header for outgoing IP packet.</p> |
| <p>For IP multicast and broadcast, corresponding Ethernet addresses are selected and the packet is transmitted on the link.</p> |
| <p>For unicast addresses, the packet is submitted to <a class="el" href="etharp_8c.html#ae180772e31346a0afeb707ad172dd19c">etharp_query()</a>. In case the IP address is outside the local network, the IP address of the gateway is used.</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">netif</td><td>The lwIP network interface which the IP packet will be sent on. </td></tr> |
| <tr><td class="paramname">q</td><td>The <a class="el" href="structpbuf.html">pbuf(s)</a> containing the IP packet to be sent. </td></tr> |
| <tr><td class="paramname">ipaddr</td><td>The IP address of the packet destination.</td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section return"><dt>Returns</dt><dd><ul> |
| <li>ERR_RTE No route to destination (no gateway to external networks), or the return type of either <a class="el" href="etharp_8c.html#ae180772e31346a0afeb707ad172dd19c">etharp_query()</a> or <a class="el" href="group__ethernet.html#gac9cad5802bfa3d885f13d2ba0f40b778">ethernet_output()</a>. </li> |
| </ul> |
| </dd></dl> |
| |
| </div> |
| </div> |
| <a id="ae180772e31346a0afeb707ad172dd19c"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#ae180772e31346a0afeb707ad172dd19c">◆ </a></span>etharp_query()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname"><a class="el" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> etharp_query </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>ipaddr</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">struct <a class="el" href="structpbuf.html">pbuf</a> * </td> |
| <td class="paramname"><em>q</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Send an ARP request for the given IP address and/or queue a packet.</p> |
| <p>If the IP address was not yet in the cache, a pending ARP cache entry is added and an ARP request is sent for the given address. The packet is queued on this entry.</p> |
| <p>If the IP address was already pending in the cache, a new ARP request is sent for the given address. The packet is queued on this entry.</p> |
| <p>If the IP address was already stable in the cache, and a packet is given, it is directly sent and no ARP request is sent out.</p> |
| <p>If the IP address was already stable in the cache, and no packet is given, an ARP request is sent out.</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">netif</td><td>The lwIP network interface on which ipaddr must be queried for. </td></tr> |
| <tr><td class="paramname">ipaddr</td><td>The IP address to be resolved. </td></tr> |
| <tr><td class="paramname">q</td><td>If non-NULL, a pbuf that must be delivered to the IP address. q is not freed by this function.</td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section note"><dt>Note</dt><dd>q must only be ONE packet, not a packet queue!</dd></dl> |
| <dl class="section return"><dt>Returns</dt><dd><ul> |
| <li>ERR_BUF Could not make room for Ethernet header.</li> |
| <li>ERR_MEM Hardware address unknown, and no more ARP entries available to query for address or queue the packet.</li> |
| <li>ERR_MEM Could not queue packet due to memory shortage.</li> |
| <li>ERR_RTE No route to destination (no gateway to external networks).</li> |
| <li>ERR_ARG Non-unicast address given, those will not appear in ARP cache. </li> |
| </ul> |
| </dd></dl> |
| |
| </div> |
| </div> |
| <a id="a3e56faced96841e615f88dd57d1b2b15"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a3e56faced96841e615f88dd57d1b2b15">◆ </a></span>etharp_request()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname"><a class="el" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> etharp_request </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>ipaddr</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Send an ARP request packet asking for ipaddr.</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">netif</td><td>the lwip network interface on which to send the request </td></tr> |
| <tr><td class="paramname">ipaddr</td><td>the IP address for which to ask </td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section return"><dt>Returns</dt><dd>ERR_OK if the request has been sent ERR_MEM if the ARP packet couldn't be allocated any other err_t on failure </dd></dl> |
| |
| </div> |
| </div> |
| <a id="a654f4dad71f7e2bc4820094648f37a26"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a654f4dad71f7e2bc4820094648f37a26">◆ </a></span>etharp_tmr()</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">void etharp_tmr </td> |
| <td>(</td> |
| <td class="paramtype">void </td> |
| <td class="paramname"></td><td>)</td> |
| <td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>Clears expired entries in the ARP table.</p> |
| <p>This function should be called every ARP_TMR_INTERVAL milliseconds (1 second), in order to expire entries in the ARP table. </p> |
| |
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