ifconf 和 ifreq 结构体

最新推荐文章于 2022-07-16 14:07:01 发布

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最新推荐文章于 2022-07-16 14:07:01 发布 · 778 阅读

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ifreq和ifconf结构体在Linux中用于配置网络接口，如IP地址、MTU等。ifreq包含接口名和接口信息，存在于ifconf中，后者用于存储所有接口的信息。ifconf有两个主要成员：ifc_len表示缓冲区长度，ifc_buf存储接口信息。通过ioctl调用，可以获取并修改接口配置。示例代码展示了如何使用这两个结构体来操作网络接口。

1. ifreq

/*
 * Interface request structure used for socket
 * ioctl's.  All interface ioctl's must have parameter
 * definitions which begin with ifr_name.  The
 * remainder may be interface specific.
 */

struct ifreq {
#define IFHWADDRLEN     6
        union
        {
                char    ifrn_name[IFNAMSIZ];            /* if name, e.g. "en0" */
        } ifr_ifrn;

        union {
                struct  sockaddr ifru_addr;
                struct  sockaddr ifru_dstaddr;
                struct  sockaddr ifru_broadaddr;
                struct  sockaddr ifru_netmask;
                struct  sockaddr ifru_hwaddr;
                short   ifru_flags;
                int     ifru_ivalue;
                int     ifru_mtu;
                struct  ifmap ifru_map;
                char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
                char    ifru_newname[IFNAMSIZ];
                void __user *   ifru_data;
                struct  if_settings ifru_settings;
        } ifr_ifru;
};

#define ifr_name        ifr_ifrn.ifrn_name      /* interface name       */
#define ifr_hwaddr      ifr_ifru.ifru_hwaddr    /* MAC address          */
#define ifr_addr        ifr_ifru.ifru_addr      /* address              */
#define ifr_dstaddr     ifr_ifru.ifru_dstaddr   /* other end of p-p lnk */
#define ifr_broadaddr   ifr_ifru.ifru_broadaddr /* broadcast a

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