netxduo
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Outline
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#define NX_SOURCE_CODE
#include "nx_api.h"
#include "nx_arp.h"
#include "nx_packet.h"
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_nx_arp_dynamic_entry_delete(NX_IP *, NX_ARP *)
Files
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SourceVuSTM32 Libraries and Samplesnetxduocommon/src/nx_arp_dynamic_entry_delete.c
 
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/**************************************************************************/ /* */ /* Copyright (c) Microsoft Corporation. All rights reserved. */ /* */ /* This software is licensed under the Microsoft Software License */ /* Terms for Microsoft Azure RTOS. Full text of the license can be */ /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ /* and in the root directory of this software. */ /* */... /**************************************************************************/ ... /**************************************************************************/ /**************************************************************************/ /** */ /** NetX Component */ /** */ /** Address Resolution Protocol (ARP) */ /** */... /**************************************************************************/ /**************************************************************************/ #define NX_SOURCE_CODE /* Include necessary system files. */ #include "nx_api.h" #include "nx_arp.h" #include "nx_packet.h" #ifndef NX_DISABLE_IPV4... /**************************************************************************/ /* */ /* FUNCTION RELEASE */ /* */ /* _nx_arp_dynamic_entry_delete PORTABLE C */ /* 6.1 */ /* AUTHOR */ /* */ /* Yuxin Zhou, Microsoft Corporation */ /* */ /* DESCRIPTION */ /* */ /* This function deletes the ARP entry pointed to by the caller. Note */ /* the caller should already have searched the ARP list to verify a */ /* valid ARP entry to delete. Also, it is assumed the caller already */ /* has obtained the IP protection mutex before invoking this service. */ /* */ /* INPUT */ /* */ /* ip_ptr IP instance of APR table */ /* arp_ptr ARP entry to delete */ /* */ /* OUTPUT */ /* */ /* status Completion status */ /* */ /* CALLS */ /* */ /* _nx_packet_transmit_release Release the transmitted packet*/ /* */ /* CALLED BY */ /* */ /* Internal */ /* */ /* RELEASE HISTORY */ /* */ /* DATE NAME DESCRIPTION */ /* */ /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ /* 09-30-2020 Yuxin Zhou Modified comment(s), */ /* resulting in version 6.1 */ /* */... /**************************************************************************/ UINT _nx_arp_dynamic_entry_delete(NX_IP *ip_ptr, NX_ARP *arp_ptr) { TX_INTERRUPT_SAVE_AREA NX_PACKET *packet_ptr, *next_packet_ptr; /* Determine if this ARP entry is already active. */ if (arp_ptr -> nx_arp_active_list_head) { /* Remove this dynamic ARP entry from the associated list. */ /* Disable interrupts. */ TX_DISABLE /* Determine if this is the only ARP entry on the list. */ if (arp_ptr == arp_ptr -> nx_arp_active_next) { /* Remove the entry from the list. */ *(arp_ptr -> nx_arp_active_list_head) = NX_NULL; }if (arp_ptr == arp_ptr -> nx_arp_active_next) { ... } else { /* Remove the entry from a list of more than one entry. */ /* Update the list head pointer. */ if (*(arp_ptr -> nx_arp_active_list_head) == arp_ptr) { *(arp_ptr -> nx_arp_active_list_head) = arp_ptr -> nx_arp_active_next; }if (*(arp_ptr -> nx_arp_active_list_head) == arp_ptr) { ... } /* Update the links of the adjacent ARP entries. */ (arp_ptr -> nx_arp_active_next) -> nx_arp_active_previous = arp_ptr -> nx_arp_active_previous; (arp_ptr -> nx_arp_active_previous) -> nx_arp_active_next = arp_ptr -> nx_arp_active_next; }else { ... } /* No longer active, clear the active list head. */ arp_ptr -> nx_arp_active_list_head = NX_NULL; /* Decrease the number of active ARP entries. */ ip_ptr -> nx_ip_arp_dynamic_active_count--; /* Pickup the queued packets head pointer. */ next_packet_ptr = arp_ptr -> nx_arp_packets_waiting; /* Clear the queued packets head pointer. */ arp_ptr -> nx_arp_packets_waiting = NX_NULL; /* Restore interrupts. */ TX_RESTORE /* Loop to remove all queued packets. */ while (next_packet_ptr) { /* Pickup the packet pointer at the head of the queue. */ packet_ptr = next_packet_ptr; /* Move to the next packet in the queue. */ next_packet_ptr = next_packet_ptr -> nx_packet_queue_next; /* Clear the next packet queue pointer. */ packet_ptr -> nx_packet_queue_next = NX_NULL; #ifndef NX_DISABLE_IP_INFO /* Increment the IP send packets dropped count. */ ip_ptr -> nx_ip_send_packets_dropped++;/* ... */ #endif /* Release the packet that was queued from the previous ARP entry. */ _nx_packet_transmit_release(packet_ptr); }while (next_packet_ptr) { ... } }if (arp_ptr -> nx_arp_active_list_head) { ... } return(NX_SUCCESS); }{ ... } #endif/* ... */ /* !NX_DISABLE_IPV4 */
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