linux tun brctl

#include <linux/if.h>
#include <linux/if_tun.h>
#include <fcntl.h>
#include <unistd.h>

int main() {
    int fd;
    struct ifreq ifr;

    fd = open("/dev/net/tun", O_RDWR);
    if (fd < 0) {
        perror("Opening /dev/net/tun");
        return 1;
    }

    memset(&ifr, 0, sizeof(ifr));
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;

    strncpy(ifr.ifr_name, "tap0", IFNAMSIZ);

    if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
        perror("ioctl(TUNSETIFF)");
        return 1;
    }

    printf("TAP device %s opened\n", ifr.ifr_name);

    // 读取和写入数据包的逻辑...

    close(fd);
    return 0;
}

# 安装 bridge-utils（如果尚未安装）
sudo apt-get install bridge-utils

# 创建一个新的桥接
sudo brctl addbr mybridge

# 将接口添加到桥接
sudo brctl addif mybridge eth0
sudo brctl addif mybridge tap0

# 启用桥接
sudo ip link set mybridge up