arpcache.c File Reference

ARP cache. More...

#include <cfg/os.h>
#include <cfg/arp.h>
#include <sys/event.h>
#include <sys/timer.h>
#include <stdlib.h>
#include <string.h>
#include <memdebug.h>
#include <net/if_var.h>
#include <netinet/if_ether.h>
#include <arpa/inet.h>
#include <net/netdebug.h>

Include dependency graph for arpcache.c:

Go to the source code of this file.

Functions
void	NutArpCacheUpdate (NUTDEVICE *dev, uint32_t ip, uint8_t *ha)
	Update an ARP entry.
int	NutArpCacheQuery (NUTDEVICE *dev, CONST uint32_t ip, uint8_t *mac)
	Query MAC address for a specified IP address.
ARP Configuration
The Nut/OS Configurator may be used to override the default values.
#define	MAX_ARPAGE   9
	Maximum age of an entry in the ARP cache in minutes.
#define	MAX_ARPREQUESTS   1
	Maximum number of ARP requests generated per query.
#define	MIN_ARPWAIT   500
	Minimum wait before sending out a new ARP request.

---

Detailed Description

ARP cache.

 *
 * $Log$
 * Revision 1.16  2009/02/13 14:52:05  haraldkipp
 * Include memdebug.h for heap management debugging support.
 *
 * Revision 1.15  2008/08/11 07:00:29  haraldkipp
 * BSD types replaced by stdint types (feature request #1282721).
 *
 * Revision 1.14  2006/10/05 17:24:41  haraldkipp
 * On ARP transmit errors the incomplete cache entry is not removed.
 * Subsequent queries will never send out new ARP requests. Many thanks
 * to Michael Jones for providing a first solution. I added a check,
 * which avoids to remove an already completed entry. Fixes bug #1567783.
 *
 * Revision 1.13  2005/08/02 17:46:49  haraldkipp
 * Major API documentation update.
 *
 * Revision 1.12  2005/06/05 16:49:09  haraldkipp
 * Do not do ARP retries by default.
 *
 * Revision 1.11  2005/05/16 08:41:25  haraldkipp
 * Bugfix: Empty queue before removing entry.
 *
 * Revision 1.10  2005/04/30 16:42:42  chaac
 * Fixed bug in handling of NUTDEBUG. Added include for cfg/os.h. If NUTDEBUG
 * is defined in NutConf, it will make effect where it is used.
 *
 * Revision 1.9  2005/03/13 13:40:32  haraldkipp
 * If NutArpOutput() failed, then NutArpCacheQuery() released the already
 * released NETBUF. This bug had been fixed. If NutArpAllocNetBuf() fails,
 * the ARP entry will now be removed immediately. Additional check for
 * valid entry pointer added. These modifications had been suggested by
 * Dusan Ferbas. Finally memcpy() has been replaced by a simple loop in order
 * to provide a work around for GCC Bug #18251.
 *
 * Revision 1.8  2005/02/07 18:57:49  haraldkipp
 * ICCAVR compile errors fixed
 *
 * Revision 1.7  2005/02/07 09:26:56  haraldkipp
 * Argh! Committed wrong source.
 *
 * Revision 1.5  2005/02/04 14:55:08  haraldkipp
 * Almost a complete redesign. Replaced the ARP timer thread by calling an
 * ARP aging routine before each incoming ARP and outgoing IP packet.
 * This also fixes the bug, which generated two ARP requests per query.
 * Thanks to Dusam Ferbas and Rostislav Hlebak for their help.
 *
 * Revision 1.4  2004/07/27 19:38:30  drsung
 * Under certain circumstances the same ARPENTRY was
 * allocated twice.
 *
 * Revision 1.3  2004/03/18 10:18:01  haraldkipp
 * Comments updated
 *
 * Revision 1.2  2004/02/08 17:14:05  drsung
 * arp entries with set ATF_PERM flag are not removed any longer.
 *
 * Revision 1.1.1.1  2003/05/09 14:41:26  haraldkipp
 * Initial using 3.2.1
 *
 * Revision 1.16  2003/02/04 18:14:56  harald
 * Version 3 released
 *
 * Revision 1.15  2002/06/26 17:29:35  harald
 * First pre-release with 2.4 stack
 *
 * 

Definition in file arpcache.c.