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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Neighbor Discovery Cache */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ipv6.h"
#include "nx_nd_cache.h"
#include "nx_packet.h"
#include "nx_icmpv6.h"
#ifdef FEATURE_NX_IPV6
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* nx_nd_cache_delete_internal PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function deletes an IPv6 and MAC mapping from the ND cache */
/* table. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP. */
/* dest_ip Pointer to the IP address. */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Address is deleted */
/* NX_ENTRY_NOT_FOUND Address not found in cache */
/* */
/* CALLS */
/* */
/* _nx_packet_transmit_releas Packet Release */
/* memset */
/* */
/* CALLED BY */
/* */
/* nxd_ipv6_disable */
/* nx_nd_cache_fast_periodic_update */
/* nxd_nd_cache_entry_delete */
/* */
/* Note: */
/* */
/* This routine is an internal function. Therefore it assumes the */
/* mutex is already locked. Caller is responsible for accquiring */
/* and releasing the mutex before invoking this routine. */
/* */
/* */
/**************************************************************************/
UINT _nx_nd_cache_delete_internal(NX_IP *ip_ptr, ND_CACHE_ENTRY *entry)
{
UINT i = 0, table_size;
NX_PACKET *pkt, *next_pkt;
/* Free up the queued packets. */
pkt = entry -> nx_nd_cache_packet_waiting_head;
/* Flush any packets enqueued waiting on neighbor reachability confirmation. */
while (pkt)
{
next_pkt = pkt -> nx_packet_queue_next;
_nx_packet_transmit_release(pkt);
pkt = next_pkt;
}
entry -> nx_nd_cache_packet_waiting_queue_length = 0;
/* Clear the pointers to the original start and end of the packet queue. */
entry -> nx_nd_cache_packet_waiting_head = NX_NULL;
entry -> nx_nd_cache_packet_waiting_tail = NX_NULL;
/* Initialize the rest of the fields. */
memset(entry -> nx_nd_cache_mac_addr, 0, 6);
/* Clear the entry out. */
entry -> nx_nd_cache_nd_status = ND_CACHE_STATE_INVALID;
entry -> nx_nd_cache_is_static = 0;
/* Is there a corresponding link in the default router list? */
if (entry -> nx_nd_cache_is_router)
{
/* Set its pointer to this entry in the cache table to NULL. */
entry -> nx_nd_cache_is_router -> nx_ipv6_default_router_entry_neighbor_cache_ptr = NX_NULL;
}
/* And indicate that this cache entry is no longer a router. */
entry -> nx_nd_cache_is_router = NX_NULL;
/* Set a local variable for convenience. */
table_size = ip_ptr -> nx_ipv6_destination_table_size;
while (table_size && i < NX_IPV6_DESTINATION_TABLE_SIZE)
{
/* Skip invalid entries. */
if (!ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_valid)
{
i++;
continue;
}
/* Keep track of valid entries we have checked. */
table_size--;
/* Find the destination unit. */
if (ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_nd_entry == entry)
{
/* Set the status. */
ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_valid = 0;
/* Set its pointer to this entry in the destination table to NULL. */
ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_nd_entry = NX_NULL;
/* Update the destination_table size. */
ip_ptr -> nx_ipv6_destination_table_size--;
}
i++;
}
return(NX_SUCCESS);
}
#endif /* FEATURE_NX_IPV6 */
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