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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 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_default_router_add_interanl PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function sets IPv6 routing table entry. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* router_addr Destination Network addr */
/* router_lifetime Life time information */
/* if_ptr Pointer to the interface */
/* router_type dynamic or static */
/* _ret Return value, indicates where */
/* the new entry is located. */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* COPY_IPV6_ADDRESS Copy IP addresses */
/* */
/* CALLED BY */
/* */
/* _nxd_ipv6_default_router_add Add default router to IP */
/* default router list */
/* _nx_icmpv6_process_redirect Process ICMPv6 redirect */
/* message */
/* _nx_icmpv6_process_ra Process incoming Router */
/* Advertisement packets */
/* */
/* NOTE */
/* */
/* Make sure nx_ip_prortection mutex is obtained before entering this */
/* function. */
/* */
/* This function cannot be called from ISR. */
/* */
/* 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_default_router_add_internal(NX_IP *ip_ptr,
ULONG *router_addr,
ULONG router_lifetime,
NX_INTERFACE *if_ptr,
INT router_type,
NX_IPV6_DEFAULT_ROUTER_ENTRY **_ret)
{
UINT i;
UINT first_available = (UINT)0xFFFFFFFF;
ULONG address_type;
NX_IPV6_DEFAULT_ROUTER_ENTRY *ret = NX_NULL;
NXD_IPV6_ADDRESS *ipv6_address;
/* If a router pointer is provided, initialize it to NULL. */
if (_ret)
{
*_ret = NX_NULL;
}
/* Verify gateway address is reachable. */
address_type = IPv6_Address_Type(router_addr);
if (address_type & IPV6_ADDRESS_UNICAST)
{
/* It is a unicast address. */
if (address_type & IPV6_ADDRESS_GLOBAL)
{
/* It is a global address. */
/* Point to the first address unit in the interface. */
ipv6_address = if_ptr -> nxd_interface_ipv6_address_list_head;
while (ipv6_address)
{
/* Check whether destination is on link. */
if (_nxd_ipv6_find_max_prefix_length(router_addr, ipv6_address -> nxd_ipv6_address,
ipv6_address -> nxd_ipv6_address_prefix_length) >= ipv6_address -> nxd_ipv6_address_prefix_length)
{
/* Router address is on link. */
break;
}
/* Point to the next address unit. */
ipv6_address = ipv6_address -> nxd_ipv6_address_next;
}
if (ipv6_address == NX_NULL)
{
/* Gateway address is unreachable. */
return(NX_IP_ADDRESS_ERROR);
}
}
}
else
{
/* Gateway address is unreachable. */
return(NX_IP_ADDRESS_ERROR);
}
/* Search through the list for an already existing entry. */
for (i = 0; i < NX_IPV6_DEFAULT_ROUTER_TABLE_SIZE; i++)
{
/* Does this slot contain a valid router? */
if (ip_ptr -> nx_ipv6_default_router_table[i].nx_ipv6_default_router_entry_flag)
{
/* Check for matching router address. */
if (CHECK_IPV6_ADDRESSES_SAME(router_addr, ip_ptr -> nx_ipv6_default_router_table[i].nx_ipv6_default_router_entry_router_address) &&
if_ptr == ip_ptr -> nx_ipv6_default_router_table[i].nx_ipv6_default_router_entry_interface_ptr)
{
/* Its a match! */
ret = &ip_ptr -> nx_ipv6_default_router_table[i];
/* Update the router lifetime with the specified input. */
ret -> nx_ipv6_default_router_entry_life_time = (USHORT)router_lifetime;
/* Set a pointer to the router location in the table. */
if (_ret)
{
*_ret = ret;
}
return(NX_SUCCESS);
}
}
else
{
/* Flag this as a slot we can use to add the new router. */
if (first_available == (UINT)0xFFFFFFFF)
{
first_available = i;
}
}
}
/* Did we find an empty slot in the table? */
if (first_available != (UINT)0xFFFFFFFF)
{
/* Set up local pointer. */
ret = &ip_ptr -> nx_ipv6_default_router_table[first_available];
/* Copy the router's address into the router table. */
COPY_IPV6_ADDRESS(router_addr, ret -> nx_ipv6_default_router_entry_router_address);
/* Add the specified input to the router record. */
ret -> nx_ipv6_default_router_entry_flag = (UCHAR)(router_type | NX_IPV6_ROUTE_TYPE_VALID);
ret -> nx_ipv6_default_router_entry_life_time = (USHORT)router_lifetime;
/* Set the interface index. */
ret -> nx_ipv6_default_router_entry_interface_ptr = if_ptr;
/* Has no entry in the cache table. Neighbor Discovery process handles this
automaticaly. */
ret -> nx_ipv6_default_router_entry_neighbor_cache_ptr = NX_NULL;
/* Update the count of routers currently in the table. */
ip_ptr -> nx_ipv6_default_router_table_size++;
}
else
{
/* No empty slot. */
return(NX_NO_MORE_ENTRIES);
}
/* If a router pointer was supplied, set it to the location of the router
we just added to the table. */
if (_ret)
{
*_ret = ret;
}
/* Successful completion, we're done! */
return(NX_SUCCESS);
}
#endif /* FEATURE_NX_IPV6 */
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