nshlib/netcmds:support to set MTU

Usage:ifconfig interfacename mtu *** Signed-off-by: wangchen <wangchen41@xiaomi.com>
2025-10-20 04:26:04 +08:00 · 2023-04-27 10:58:11 +08:00
parent 08bfc4e9c7
commit c2f75330f7
6 changed files with 120 additions and 2 deletions
--- a/netutils/netlib/netlib_setmtu.c
+++ b/netutils/netlib/netlib_setmtu.c
@@ -0,0 +1,91 @@
+/****************************************************************************
+ * apps/netutils/netlib/netlib_setmtu.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include <netinet/in.h>
+#include <net/if.h>
+
+#include "netutils/netlib.h"
+
+#ifdef CONFIG_NET
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: netlib_set_mtu
+ *
+ * Description:
+ *   Set MTU of the NuttX driver state structure
+ *
+ * Parameters:
+ *   ifname   The name of the interface to use
+ *   mtu    Maximum Transmission Unit，MTU
+ *
+ * Return:
+ *   0 on success; -1 on failure (errno may not be set)
+ *
+ ****************************************************************************/
+
+int netlib_set_mtu(FAR const char *ifname, int mtu)
+{
+  int ret = ERROR;
+
+  if (ifname != NULL && mtu != 0)
+    {
+      /* Get a socket (only so that we get access to the INET subsystem) */
+
+      int sockfd = socket(NET_SOCK_FAMILY, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);
+      if (sockfd >= 0)
+        {
+          struct ifreq req;
+
+          /* Put the driver name into the request */
+
+          strlcpy(req.ifr_name, ifname, IFNAMSIZ);
+
+          /* Put the new MTU into the request */
+
+          req.ifr_mtu = mtu;
+
+          /* Perform the ioctl to set the MTU */
+
+          ret = ioctl(sockfd, SIOCSIFMTU, (unsigned long)&req);
+          close(sockfd);
+        }
+    }
+
+  return ret;
+}
+
+#endif /* CONFIG_NET */