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142 lines
5.2 KiB
C
142 lines
5.2 KiB
C
/*
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* FreeRTOS+TCP V2.0.3
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* Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://aws.amazon.com/freertos
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* http://www.FreeRTOS.org
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*/
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#ifndef FREERTOS_ARP_H
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#define FREERTOS_ARP_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Application level configuration options. */
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#include "FreeRTOSIPConfig.h"
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#include "FreeRTOSIPConfigDefaults.h"
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#include "IPTraceMacroDefaults.h"
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/*-----------------------------------------------------------*/
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/* Miscellaneous structure and definitions. */
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/*-----------------------------------------------------------*/
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typedef struct xARP_CACHE_TABLE_ROW
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{
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uint32_t ulIPAddress; /* The IP address of an ARP cache entry. */
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MACAddress_t xMACAddress; /* The MAC address of an ARP cache entry. */
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uint8_t ucAge; /* A value that is periodically decremented but can also be refreshed by active communication. The ARP cache entry is removed if the value reaches zero. */
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uint8_t ucValid; /* pdTRUE: xMACAddress is valid, pdFALSE: waiting for ARP reply */
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} ARPCacheRow_t;
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typedef enum
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{
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eARPCacheMiss = 0, /* 0 An ARP table lookup did not find a valid entry. */
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eARPCacheHit, /* 1 An ARP table lookup found a valid entry. */
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eCantSendPacket /* 2 There is no IP address, or an ARP is still in progress, so the packet cannot be sent. */
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} eARPLookupResult_t;
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typedef enum
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{
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eNotFragment = 0, /* The IP packet being sent is not part of a fragment. */
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eFirstFragment, /* The IP packet being sent is the first in a set of fragmented packets. */
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eFollowingFragment /* The IP packet being sent is part of a set of fragmented packets. */
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} eIPFragmentStatus_t;
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/*
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* If ulIPAddress is already in the ARP cache table then reset the age of the
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* entry back to its maximum value. If ulIPAddress is not already in the ARP
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* cache table then add it - replacing the oldest current entry if there is not
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* a free space available.
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*/
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void vARPRefreshCacheEntry( const MACAddress_t * pxMACAddress, const uint32_t ulIPAddress );
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#if( ipconfigARP_USE_CLASH_DETECTION != 0 )
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/* Becomes non-zero if another device responded to a gratuitos ARP message. */
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extern BaseType_t xARPHadIPClash;
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/* MAC-address of the other device containing the same IP-address. */
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extern MACAddress_t xARPClashMacAddress;
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#endif /* ipconfigARP_USE_CLASH_DETECTION */
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#if( ipconfigUSE_ARP_REMOVE_ENTRY != 0 )
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/*
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* In some rare cases, it might be useful to remove a ARP cache entry of a
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* known MAC address to make sure it gets refreshed.
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*/
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uint32_t ulARPRemoveCacheEntryByMac( const MACAddress_t * pxMACAddress );
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#endif /* ipconfigUSE_ARP_REMOVE_ENTRY != 0 */
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/*
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* Look for ulIPAddress in the ARP cache. If the IP address exists, copy the
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* associated MAC address into pxMACAddress, refresh the ARP cache entry's
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* age, and return eARPCacheHit. If the IP address does not exist in the ARP
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* cache return eARPCacheMiss. If the packet cannot be sent for any reason
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* (maybe DHCP is still in process, or the addressing needs a gateway but there
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* isn't a gateway defined) then return eCantSendPacket.
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*/
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eARPLookupResult_t eARPGetCacheEntry( uint32_t *pulIPAddress, MACAddress_t * const pxMACAddress );
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#if( ipconfigUSE_ARP_REVERSED_LOOKUP != 0 )
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/* Lookup an IP-address if only the MAC-address is known */
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eARPLookupResult_t eARPGetCacheEntryByMac( MACAddress_t * const pxMACAddress, uint32_t *pulIPAddress );
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#endif
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/*
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* Reduce the age count in each entry within the ARP cache. An entry is no
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* longer considered valid and is deleted if its age reaches zero.
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*/
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void vARPAgeCache( void );
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/*
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* Send out an ARP request for the IP address contained in pxNetworkBuffer, and
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* add an entry into the ARP table that indicates that an ARP reply is
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* outstanding so re-transmissions can be generated.
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*/
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void vARPGenerateRequestPacket( NetworkBufferDescriptor_t * const pxNetworkBuffer );
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/*
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* After DHCP is ready and when changing IP address, force a quick send of our new IP
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* address
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*/
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void vARPSendGratuitous( void );
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif /* FREERTOS_ARP_H */
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