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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 */
/** */
/** Internet Protocol (IP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ipv6.h"
#ifdef FEATURE_NX_IPV6
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxd_ipv6_interface_find PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function finds a suitable outgoing interface based on the */
/* destination IP address. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* dest_address Destination IP address */
/* ipv6_interface_index Index interface to use as the */
/* outgoing interface. */
/* ipv6_address_index Address index to use as the */
/* source address */
/* if_ptr Outgoing interface if not null*/
/* */
/* OUTPUT */
/* */
/* status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Internal function. */
/* */
/* 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 _nxd_ipv6_interface_find(NX_IP *ip_ptr, ULONG *dest_address,
NXD_IPV6_ADDRESS **ipv6_addr, NX_INTERFACE *if_ptr)
{
UINT i;
NXD_IPV6_ADDRESS *ipv6_address;
NX_IPV6_DEFAULT_ROUTER_ENTRY *rt_entry;
UINT start_index;
UINT end_index;
ULONG address_type = IPv6_Address_Type(dest_address);
/* ipv6_addr must not be NULL. */
NX_ASSERT(ipv6_addr != NX_NULL);
#ifdef NX_ENABLE_IPV6_MULTICAST
/* Check for a multicast destination address.*/
if (address_type & IPV6_ADDRESS_MULTICAST)
{
/* Search the address whether match our mld join list. */
for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++)
{
/* Skip empty entries. */
if (ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list == NX_NULL)
{
continue;
}
/* Skip not matched interface. */
if (if_ptr && (ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list != if_ptr))
{
continue;
}
/* Skip multicast entry whose related interface is down. */
if (ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list -> nx_interface_link_up == NX_FALSE)
{
continue;
}
if (CHECK_IPV6_ADDRESSES_SAME(ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_list, dest_address))
{
*ipv6_addr = ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list -> nxd_interface_ipv6_address_list_head;
/* Check whether there's address on the interface. */
if (*ipv6_addr == NX_NULL)
{
return(NX_NO_INTERFACE_ADDRESS);
}
/* The address must be valid in list queue of interface. */
NX_ASSERT((*ipv6_addr) -> nxd_ipv6_address_valid);
return(NX_SUCCESS);
}
}
}
#endif /* NX_ENABLE_IPV6_MULTICAST */
/* Loop through addresses. */
if (address_type & IPV6_ADDRESS_UNICAST)
{
/* Unicast address. Is the destination one of local address? */
for (i = 0; i < NX_MAX_IPV6_ADDRESSES; i++)
{
/* Compare the address. */
if ((ip_ptr -> nx_ipv6_address[i].nxd_ipv6_address_valid) &&
(CHECK_IPV6_ADDRESSES_SAME(ip_ptr -> nx_ipv6_address[i].nxd_ipv6_address, dest_address)))
{
/* Found a proper address. */
*ipv6_addr = &(ip_ptr -> nx_ipv6_address[i]);
return(NX_SUCCESS);
}
}
}
if (if_ptr)
{
/* Search addresses from specified interface only. */
start_index = if_ptr -> nx_interface_index;
end_index = (UINT)(if_ptr -> nx_interface_index + 1);
}
else
{
/* Search addressed from all interfaces. */
start_index = 0;
end_index = NX_MAX_PHYSICAL_INTERFACES;
}
/* Loop through interfaces. */
for (i = start_index; i < end_index; i++)
{
/* Skip interface which is down. */
if (ip_ptr -> nx_ip_interface[i].nx_interface_link_up == NX_FALSE)
{
continue;
}
/* Point to the first address unit in the interface. */
for (ipv6_address = ip_ptr -> nx_ip_interface[i].nxd_interface_ipv6_address_list_head;
ipv6_address;
ipv6_address = ipv6_address -> nxd_ipv6_address_next)
{
/* Skip address that is not valid. */
if (ipv6_address -> nxd_ipv6_address_state != NX_IPV6_ADDR_STATE_VALID)
{
continue;
}
if (address_type & IPV6_ADDRESS_LINKLOCAL)
{
/* Destination address is link local. */
if (IPv6_Address_Type(ipv6_address -> nxd_ipv6_address) & IPV6_ADDRESS_LINKLOCAL)
{
/* Found link local address as source. */
break;
}
}
else if (_nxd_ipv6_find_max_prefix_length(dest_address, ipv6_address -> nxd_ipv6_address,
ipv6_address -> nxd_ipv6_address_prefix_length) >=
ipv6_address -> nxd_ipv6_address_prefix_length)
{
/* Found a proper outgoing address. */
break;
}
/* Check for a multicast destination address.*/
else if (address_type & IPV6_ADDRESS_MULTICAST)
{
/* This indicates a global IP multicast. */
/* So we need to make a best guess at the
address index of the host global address. */
/* Determine(LLA vs Global IP address type from the higher order bytes. */
if ((dest_address[0] & 0x000F0000) == 0x00020000)
{
/* Check for a link local IP address. */
if (IPv6_Address_Type(ipv6_address -> nxd_ipv6_address) & IPV6_ADDRESS_LINKLOCAL)
{
/* This will do! */
break;
}
}
/* Check for a global IP address. */
else if (IPv6_Address_Type(ipv6_address -> nxd_ipv6_address) & IPV6_ADDRESS_GLOBAL)
{
/* This will do! */
break;
}
}
}
if (ipv6_address)
{
/* Found a proper address. */
*ipv6_addr = ipv6_address;
return(NX_SUCCESS);
}
}
#ifndef NX_DISABLE_LOOPBACK_INTERFACE
/* Get ipv6 address in the loop back interface. */
ipv6_address = ip_ptr -> nx_ip_interface[NX_LOOPBACK_INTERFACE].nxd_interface_ipv6_address_list_head;
if (ipv6_address)
{
/* Check whether the destination is loop back address. */
if (CHECK_IPV6_ADDRESSES_SAME(ipv6_address -> nxd_ipv6_address, dest_address))
{
*ipv6_addr = ipv6_address;
return(NX_SUCCESS);
}
}
#endif /* NX_DISABLE_LOOPBACK_INTERFACE */
/* Is the destination address gloabl? */
if (address_type & IPV6_ADDRESS_GLOBAL)
{
/* Yes. Check default router. */
for (i = 0; i < NX_IPV6_DEFAULT_ROUTER_TABLE_SIZE; i++)
{
rt_entry = &ip_ptr -> nx_ipv6_default_router_table[i];
/* Skip invalid entries. */
if (rt_entry -> nx_ipv6_default_router_entry_flag == 0)
{
continue;
}
/* Skip interface which is down. */
if (rt_entry -> nx_ipv6_default_router_entry_interface_ptr -> nx_interface_link_up == NX_FALSE)
{
continue;
}
/* Skip not matched interface. */
if (if_ptr && (rt_entry -> nx_ipv6_default_router_entry_interface_ptr != if_ptr))
{
continue;
}
/* Get first address from interface. */
ipv6_address = rt_entry -> nx_ipv6_default_router_entry_interface_ptr -> nxd_interface_ipv6_address_list_head;
while (ipv6_address)
{
/* Check for a valid address. */
if (ipv6_address -> nxd_ipv6_address_state != NX_IPV6_ADDR_STATE_VALID)
{
ipv6_address = ipv6_address -> nxd_ipv6_address_next;
}
/* Check for link-local address. */
else if (IPv6_Address_Type(ipv6_address -> nxd_ipv6_address) & IPV6_ADDRESS_LINKLOCAL)
{
ipv6_address = ipv6_address -> nxd_ipv6_address_next;
}
else
{
*ipv6_addr = ipv6_address;
/* Found global address as link-local address. */
return(NX_SUCCESS);
}
}
}
}
/* No available interface. */
return(NX_NO_INTERFACE_ADDRESS);
}
#endif /* FEATURE_NX_IPV6 */
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