모듈 컴파일 질문입니다.(컴파일 에러)

static int __init getip_init(void)
{
    struct ifreq ifr;
    struct in_device *in_dev;
    struct in_ifaddr **ifap = NULL;
    struct in_ifaddr *ifa = NULL;
    struct net_device *dev;
 
    printf("get ip module init\n");
    strcpy(ifr.ifr_name, "eth0");
    rtnl_lock();
    dev = __dev_get_by_name(&init_net, ifr.ifr_name);
    if((in_dev = __in_dev_get_rtnl(dev))!=NULL){
        if(!ifa){
            for(ifap=&in_deb->ifa_list; (ifa = *ifap)!=NULL; ifap = &ifa->ifa_next)
                if(!strcmp(ifr.ifr_name,ifa->label))
                    break;
        }
    }
    rtnl_unlock();
    printk("%x\n", ifa->ifa_local);
 
    return 0;
}

KDIR :=/lib/modules/$(shell uname -r)/build
PWD :=$(shell pwd)
 
obj-m += get_ip.o
 
default:
    $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
 
clean:
    rm -rf *.o
    rm -rf *.mod.*
    rm -rf *.ko