92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
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/****************************************************************************
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* apps/netutils/netlib/netlib_setmtu.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 <sys/socket.h>
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#include <sys/ioctl.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include "netutils/netlib.h"
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#ifdef CONFIG_NET
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: netlib_set_mtu
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*
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* Description:
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* Set MTU of the NuttX driver state structure
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*
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* Parameters:
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* ifname The name of the interface to use
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* mtu Maximum Transmission Unit，MTU
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*
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* Return:
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* 0 on success; -1 on failure (errno may not be set)
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*
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****************************************************************************/
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int netlib_set_mtu(FAR const char *ifname, int mtu)
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{
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int ret = ERROR;
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if (ifname != NULL && mtu != 0)
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{
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/* Get a socket (only so that we get access to the INET subsystem) */
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int sockfd = socket(NET_SOCK_FAMILY, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);
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if (sockfd >= 0)
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{
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struct ifreq req;
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/* Put the driver name into the request */
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strlcpy(req.ifr_name, ifname, IFNAMSIZ);
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/* Put the new MTU into the request */
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req.ifr_mtu = mtu;
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/* Perform the ioctl to set the MTU */
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ret = ioctl(sockfd, SIOCSIFMTU, (unsigned long)&req);
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close(sockfd);
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}
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}
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return ret;
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}
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#endif /* CONFIG_NET */
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