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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 */
/** */
/** Internet Protocol version 6 Default Router Table (IPv6 router) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ipv6.h"
#include "nx_nd_cache.h"
#ifdef FEATURE_NX_IPV6
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxd_ipv6_search_onlink PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks whether a given IP address is on link. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance */
/* dest_addr The destination address to */
/* be checked. */
/* */
/* OUTPUT */
/* */
/* status 0: Address is not onlink */
/* 1: Address is onlink */
/* */
/* CALLS */
/* */
/* NONE */
/* */
/* CALLED BY */
/* */
/* nx_ipv6_packet_send Sends IPv6 packets from upper */
/* layer to remote host */
/* */
/**************************************************************************/
INT _nxd_ipv6_search_onlink(NX_IP *ip_ptr, ULONG *dest_addr)
{
UINT addr_index;
NX_IPV6_PREFIX_ENTRY *prefix_entry;
NXD_IPV6_ADDRESS *ipv6_address;
/* First special case is the link local address. All these
addresses are onlink. */
if (IPv6_Address_Type(dest_addr) & IPV6_ADDRESS_LINKLOCAL)
{
return(1);
}
/* Set a local pointer for convenience. */
prefix_entry = ip_ptr -> nx_ipv6_prefix_list_ptr;
/* Loop through the prefix table. Prefixes are the IPv6 equivalent of
network domains in IPv4. */
while (prefix_entry)
{
/* Check whether or not the destination address is matched. */
if (CHECK_IP_ADDRESSES_BY_PREFIX(dest_addr,
prefix_entry -> nx_ipv6_prefix_entry_network_address,
prefix_entry -> nx_ipv6_prefix_entry_prefix_length))
{
return(1);
}
/* No match. Try the next prefix. */
prefix_entry = prefix_entry -> nx_ipv6_prefix_entry_next;
}
/* If no matches found in the prefix list, search the manually configured IPv6 interface addresses. */
for (addr_index = 0; addr_index < NX_MAX_IPV6_ADDRESSES; addr_index++)
{
ipv6_address = &ip_ptr -> nx_ipv6_address[addr_index];
/* Skip invalid entries. */
if (!(ipv6_address -> nxd_ipv6_address_valid))
{
continue;
}
/* Skip non-manually configured entires. */
if (ipv6_address -> nxd_ipv6_address_ConfigurationMethod != NX_IPV6_ADDRESS_MANUAL_CONFIG)
{
continue;
}
/* Check whether or not the destination address is matched. */
if (CHECK_IP_ADDRESSES_BY_PREFIX(dest_addr,
ipv6_address -> nxd_ipv6_address,
ipv6_address -> nxd_ipv6_address_prefix_length))
{
return(1);
}
}
/* No matches found. Not an onlink address. */
return(0);
}
#endif /* FEATURE_NX_IPV6 */
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