2 * FreeRTOS+TCP V2.0.1
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3 * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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28 #ifndef FREERTOS_ARP_H
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29 #define FREERTOS_ARP_H
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35 /* Application level configuration options. */
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36 #include "FreeRTOSIPConfig.h"
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37 #include "FreeRTOSIPConfigDefaults.h"
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38 #include "IPTraceMacroDefaults.h"
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40 /*-----------------------------------------------------------*/
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41 /* Miscellaneous structure and definitions. */
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42 /*-----------------------------------------------------------*/
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44 typedef struct xARP_CACHE_TABLE_ROW
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46 uint32_t ulIPAddress; /* The IP address of an ARP cache entry. */
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47 MACAddress_t xMACAddress; /* The MAC address of an ARP cache entry. */
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48 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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49 uint8_t ucValid; /* pdTRUE: xMACAddress is valid, pdFALSE: waiting for ARP reply */
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54 eARPCacheMiss = 0, /* 0 An ARP table lookup did not find a valid entry. */
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55 eARPCacheHit, /* 1 An ARP table lookup found a valid entry. */
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56 eCantSendPacket /* 2 There is no IP address, or an ARP is still in progress, so the packet cannot be sent. */
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57 } eARPLookupResult_t;
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61 eNotFragment = 0, /* The IP packet being sent is not part of a fragment. */
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62 eFirstFragment, /* The IP packet being sent is the first in a set of fragmented packets. */
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63 eFollowingFragment /* The IP packet being sent is part of a set of fragmented packets. */
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64 } eIPFragmentStatus_t;
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67 * If ulIPAddress is already in the ARP cache table then reset the age of the
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68 * entry back to its maximum value. If ulIPAddress is not already in the ARP
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69 * cache table then add it - replacing the oldest current entry if there is not
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70 * a free space available.
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72 void vARPRefreshCacheEntry( const MACAddress_t * pxMACAddress, const uint32_t ulIPAddress );
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74 #if( ipconfigARP_USE_CLASH_DETECTION != 0 )
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75 /* Becomes non-zero if another device responded to a gratuitos ARP message. */
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76 extern BaseType_t xARPHadIPClash;
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77 /* MAC-address of the other device containing the same IP-address. */
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78 extern MACAddress_t xARPClashMacAddress;
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79 #endif /* ipconfigARP_USE_CLASH_DETECTION */
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81 #if( ipconfigUSE_ARP_REMOVE_ENTRY != 0 )
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84 * In some rare cases, it might be useful to remove a ARP cache entry of a
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85 * known MAC address to make sure it gets refreshed.
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87 uint32_t ulARPRemoveCacheEntryByMac( const MACAddress_t * pxMACAddress );
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89 #endif /* ipconfigUSE_ARP_REMOVE_ENTRY != 0 */
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92 * Look for ulIPAddress in the ARP cache. If the IP address exists, copy the
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93 * associated MAC address into pxMACAddress, refresh the ARP cache entry's
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94 * age, and return eARPCacheHit. If the IP address does not exist in the ARP
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95 * cache return eARPCacheMiss. If the packet cannot be sent for any reason
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96 * (maybe DHCP is still in process, or the addressing needs a gateway but there
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97 * isn't a gateway defined) then return eCantSendPacket.
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99 eARPLookupResult_t eARPGetCacheEntry( uint32_t *pulIPAddress, MACAddress_t * const pxMACAddress );
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101 #if( ipconfigUSE_ARP_REVERSED_LOOKUP != 0 )
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103 /* Lookup an IP-address if only the MAC-address is known */
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104 eARPLookupResult_t eARPGetCacheEntryByMac( MACAddress_t * const pxMACAddress, uint32_t *pulIPAddress );
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108 * Reduce the age count in each entry within the ARP cache. An entry is no
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109 * longer considered valid and is deleted if its age reaches zero.
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111 void vARPAgeCache( void );
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114 * Send out an ARP request for the IP address contained in pxNetworkBuffer, and
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115 * add an entry into the ARP table that indicates that an ARP reply is
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116 * outstanding so re-transmissions can be generated.
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118 void vARPGenerateRequestPacket( NetworkBufferDescriptor_t * const pxNetworkBuffer );
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121 * After DHCP is ready and when changing IP address, force a quick send of our new IP
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124 void vARPSendGratuitous( void );
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130 #endif /* FREERTOS_ARP_H */
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