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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_ip.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_ip_static_route_delete PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function deletes static routing entry from the routing table. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP instance */
/* network_address network address, in host byte */
/* order. */
/* net_mask Network Mask, in host byte */
/* order. */
/* */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Successful completion status */
/* NX_NOT_IMPLEMENTED Static routing not enabled */
/* NX_NOT_SUCCESSFUL No match found */
/* */
/* CALLS */
/* */
/* tx_mutex_get */
/* tx_mutex_put */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* NOTE: */
/* */
/* None */
/* */
/* 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_ip_static_route_delete(NX_IP *ip_ptr, ULONG network_address, ULONG net_mask)
{
#if !defined(NX_DISABLE_IPV4) && defined(NX_ENABLE_IP_STATIC_ROUTING)
UINT i;
UINT found_match = NX_FALSE;
UINT status = NX_NOT_SUCCESSFUL;
network_address = network_address & net_mask;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_IP_STATIC_ROUTE_DELETE, ip_ptr, network_address, net_mask, 0, NX_TRACE_IP_EVENTS, 0, 0);
/* Obtain the IP mutex so we can manipulate the internal routing table. */
/* This routine does not need to be protected by mask off interrupt
because it cannot be invoked from ISR. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Check whether the table is empty. */
if (ip_ptr -> nx_ip_routing_table_entry_count == 0)
{
/* It is so release the lock and we're done. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(NX_SUCCESS);
}
/* Search through the routing table, check whether the same entry exists. */
for (i = 0; i < ip_ptr -> nx_ip_routing_table_entry_count; i++)
{
if (ip_ptr -> nx_ip_routing_table[i].nx_ip_routing_dest_ip == network_address &&
ip_ptr -> nx_ip_routing_table[i].nx_ip_routing_net_mask == net_mask)
{
UINT j;
/* Found the entry. */
found_match = NX_TRUE;
/* If the entry is not the last one, we need to shift to the
reset of the table to fill the hole. */
for (j = i; j < ip_ptr -> nx_ip_routing_table_entry_count; j++)
{
ip_ptr -> nx_ip_routing_table[j].nx_ip_routing_dest_ip = ip_ptr -> nx_ip_routing_table[j + 1].nx_ip_routing_dest_ip;
ip_ptr -> nx_ip_routing_table[j].nx_ip_routing_net_mask = ip_ptr -> nx_ip_routing_table[j + 1].nx_ip_routing_net_mask;
ip_ptr -> nx_ip_routing_table[j].nx_ip_routing_next_hop_address = ip_ptr -> nx_ip_routing_table[j + 1].nx_ip_routing_next_hop_address;
ip_ptr -> nx_ip_routing_table[j].nx_ip_routing_entry_ip_interface = ip_ptr -> nx_ip_routing_table[j + 1].nx_ip_routing_entry_ip_interface;
}
ip_ptr -> nx_ip_routing_table[j - 1].nx_ip_routing_dest_ip = 0;
ip_ptr -> nx_ip_routing_table[j - 1].nx_ip_routing_net_mask = 0;
ip_ptr -> nx_ip_routing_table[j - 1].nx_ip_routing_next_hop_address = 0;
ip_ptr -> nx_ip_routing_table[j - 1].nx_ip_routing_entry_ip_interface = NX_NULL;
break;
}
}
/* Don't forget to decrease table count if we were
able to delete the requested static route. */
if (found_match)
{
ip_ptr -> nx_ip_routing_table_entry_count--;
/* Indicate successful deletion. */
status = NX_SUCCESS;
}
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return outcome status to the caller. */
return(status);
#else /* !NX_DISABLE_IPV4 && NX_ENABLE_IP_STATIC_ROUTING */
NX_PARAMETER_NOT_USED(ip_ptr);
NX_PARAMETER_NOT_USED(network_address);
NX_PARAMETER_NOT_USED(net_mask);
return(NX_NOT_SUPPORTED);
#endif /* !NX_DISABLE_IPV4 && NX_ENABLE_IP_STATIC_ROUTING */
}