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|  <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">etharp.h File Reference</div> </div> |
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| <div class="contents"> |
| <div class="textblock"><code>#include "<a class="el" href="opt_8h.html">lwip/opt.h</a>"</code><br /> |
| <code>#include "<a class="el" href="pbuf_8h.html">lwip/pbuf.h</a>"</code><br /> |
| <code>#include "<a class="el" href="ip4__addr_8h.html">lwip/ip4_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="ip4_8h.html">lwip/ip4.h</a>"</code><br /> |
| <code>#include "<a class="el" href="lwip_2prot_2ethernet_8h.html">lwip/prot/ethernet.h</a>"</code><br /> |
| <code>#include "<a class="el" href="lwip_2prot_2etharp_8h.html">lwip/prot/etharp.h</a>"</code><br /> |
| </div><table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a> |
| Data Structures</h2></td></tr> |
| <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structetharp__q__entry.html">etharp_q_entry</a></td></tr> |
| <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> |
| </table><table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a> |
| Macros</h2></td></tr> |
| <tr class="memitem:aaa3d8ed1eb1129f518345e37b38cfc37"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="lwip_2etharp_8h.html#aaa3d8ed1eb1129f518345e37b38cfc37">ARP_TMR_INTERVAL</a>   1000</td></tr> |
| <tr class="separator:aaa3d8ed1eb1129f518345e37b38cfc37"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a83947dea159baf3420922084072e631e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="lwip_2etharp_8h.html#a83947dea159baf3420922084072e631e">etharp_gratuitous</a>(<a class="el" href="structnetif.html">netif</a>)   <a class="el" href="lwip_2etharp_8h.html#a3e56faced96841e615f88dd57d1b2b15">etharp_request</a>((<a class="el" href="structnetif.html">netif</a>), <a class="el" href="group__netif__ip4.html#gac9b6e63b5dd2968fe0a4813f3eefb55d">netif_ip4_addr</a>(<a class="el" href="structnetif.html">netif</a>))</td></tr> |
| <tr class="separator:a83947dea159baf3420922084072e631e"><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:a654f4dad71f7e2bc4820094648f37a26"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="lwip_2etharp_8h.html#a654f4dad71f7e2bc4820094648f37a26">etharp_tmr</a> (void)</td></tr> |
| <tr class="separator:a654f4dad71f7e2bc4820094648f37a26"><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="lwip_2etharp_8h.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="lwip_2etharp_8h.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: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="lwip_2etharp_8h.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="lwip_2etharp_8h.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="lwip_2etharp_8h.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> |
| <tr class="memitem:ae94677a2a5f3698276027c7475f6ca05"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="lwip_2etharp_8h.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:a540a5506979693ef9ac4496db9bfa7d6"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="lwip_2etharp_8h.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> |
| </table> |
| <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> |
| <div class="textblock"><p>Ethernet output function - handles OUTGOING ethernet level traffic, implements ARP resolving. To be used in most low-level netif implementations </p> |
| </div><h2 class="groupheader">Macro Definition Documentation</h2> |
| <a id="aaa3d8ed1eb1129f518345e37b38cfc37"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#aaa3d8ed1eb1129f518345e37b38cfc37">◆ </a></span>ARP_TMR_INTERVAL</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">#define ARP_TMR_INTERVAL   1000</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>1 seconds period </p> |
| |
| </div> |
| </div> |
| <a id="a83947dea159baf3420922084072e631e"></a> |
| <h2 class="memtitle"><span class="permalink"><a href="#a83947dea159baf3420922084072e631e">◆ </a></span>etharp_gratuitous</h2> |
| |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">#define etharp_gratuitous</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="lwip_2etharp_8h.html#a3e56faced96841e615f88dd57d1b2b15">etharp_request</a>((<a class="el" href="structnetif.html">netif</a>), <a class="el" href="group__netif__ip4.html#gac9b6e63b5dd2968fe0a4813f3eefb55d">netif_ip4_addr</a>(<a class="el" href="structnetif.html">netif</a>))</td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <p>For Ethernet network interfaces, we might want to send "gratuitous ARP"; this is an ARP packet sent by a node in order to spontaneously cause other nodes to update an entry in their ARP cache. From RFC 3220 "IP Mobility Support for IPv4" section 4.6. </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"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <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> |
| |
| </div> |
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