0a6b1f55ab
Gregory Nutt is has submitted the SGA Sebastien Lorquet has submitted the ICLA as a result we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/****************************************************************************
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* netutils/netlib/netlib_ipv4router.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <nuttx/net/ip.h>
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#include "netutils/netlib.h"
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#if defined(CONFIG_NET_IPv4) && defined(HAVE_ROUTE_PROCFS)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: netlib_ipv4router
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*
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* Description:
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* Given a destination address that is not on a local network, query the
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* IPv4 routing table, and return the IPv4 address of the routing that
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* will provide access to the correct sub-net.
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*
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* Input Parameters:
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* destipaddr - The destination address to use in the look-up (in network
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* byte order).
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* router - The location to return that the IP address of the router
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* (in network byte order)
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*
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* Returned Value:
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* Zero is returned on success; a negated errno value is returned on any
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* failure.
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*
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****************************************************************************/
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int netlib_ipv4router(FAR const struct in_addr *destipaddr,
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FAR struct in_addr *router)
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{
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struct netlib_ipv4_route_s route;
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FILE *stream;
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in_addr_t hdest;
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ssize_t nbytes;
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int ret = -ENOENT;
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/* Open the routing table file */
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stream = netlib_open_ipv4route();
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if (stream == NULL)
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{
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return -errno;
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}
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/* Convert the destination IP address to host byte order for the
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* comparison.
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*/
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hdest = ntohl(destipaddr->s_addr);
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/* Find the routing table entry that provides the router for this sub-net. */
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for (; ; )
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{
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/* Read the route (in host byte order) */
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nbytes = netlib_read_ipv4route(stream, &route);
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if (nbytes == 0)
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{
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/* End of file with no match */
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break;
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}
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else if (nbytes < 0)
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{
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/* Read error */
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ret = (int)nbytes;
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break;
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}
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/* Compare the prefix and the destination address under the mask */
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if (net_ipv4addr_maskcmp(route.prefix, hdest, route.netmask))
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{
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/* Found it! Return the router address in network byte order */
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router->s_addr = htonl(route.router);
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ret = OK;
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break;
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}
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}
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netlib_close_ipv4route(stream);
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return ret;
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}
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#endif /* CONFIG_NET_IPv4 && HAVE_ROUTE_PROCFS */
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