系统调用未定义！编译内核模块

Question

我是内核模块编程的新手，并尝试使用“sys_socket”在我的内核模块中创建原始套接字。我正在使用“sys_bind”和“sys_ioctl”（用于获取接口号）将此套接字绑定到接口。

在编译我的模块时，我收到以下错误：

make -C /lib/modules/3.13.0-68-generic/build M=/root/Kernel_Module modules
make[1]: Entering directory `/usr/src/linux-headers-3.13.0-68-generic'
CC [M]  /root/Kernel_Module/kernel_module.o
Building modules, stage 2.
MODPOST 1 modules
WARNING: "sys_ioctl" [/root/Kernel_Module/kernel_module.ko] undefined!
WARNING: "sys_bind" [/root/Kernel_Module/kernel_module.ko] undefined!
WARNING: "sys_socket" [/root/Kernel_Module/kernel_module.ko] undefined!
CC      /root/Kernel_Module/kernel_module.mod.o
LD [M]  /root/Kernel_Module/kernel_module.ko
make[1]: Leaving directory `/usr/src/linux-headers-3.13.0-68-generic'

我该如何解决这个问题？

代码如下：

struct sockaddr_ll socketBindAddr;
struct ifreq       ifreq;
int                socketFd = 0;

socketFd = sys_socket (AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (socketFd < 0)
{
    printk (KERN_CRIT "Failed to open data socket!!\r\n");
    return OFC_FAILURE;
}

memset (&ifreq, 0, sizeof(ifreq));
strcpy (ifreq.ifr_name, gOfcGlobals.aDataIfName);
if (sys_ioctl (socketFd, SIOCGIFINDEX, (unsigned long) &ifreq) < 0)
{
    printk (KERN_CRIT "Ioctl failed to get IfIndex!!\r\n");
    return OFC_FAILURE;
}

memset (&socketBindAddr, 0, sizeof(socketBindAddr));
socketBindAddr.sll_family = AF_PACKET;
socketBindAddr.sll_protocol = htons(ETH_P_ALL);
if (sys_bind (socketFd, (struct sockaddr *) &socketBindAddr,
    sizeof(socketBindAddr)) < 0)
{
    printk (KERN_CRIT "Failed to bind socket\r\n");
    return OFC_FAILURE;
}

Answer 1

sys_bind() 和sys_ioctl（和sys_socket）是内核的（低级）用户空间接口。您尚未向我们展示您编写的代码，但您需要使用更适合您的网络访问的内核内部接口。