|
what is your kernel
version?
maybe you should use NF_INET_PRE_ROUTING instead.
2012-05-22
c265n46
发件人：Chir0n
发送时间：2012-05-08 12:14
主题：Why I can't compile a simple
netfilter hook module?
收件人："kernelnewbies"<kernelnewbies@xxxxxxxxxxxxxxxxx>
抄送：
I'm using this Makefile: obj-m += hello.o all: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules clean: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean The hello.c is this: #include <linux/kernel.h> #include <linux/module.h> #include <linux/netfilter.h> #include <linux/netfilter_ipv4.h> static struct nf_hook_ops nfho; //struct holding set of hook function options //function to be called by hook unsigned int hook_func(unsigned int hooknum, struct sk_buff **skb, const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)) { printk(KERN_INFO "packet dropped\n"); //log to var/log/messages return NF_DROP; //drops the packet } //Called when module loaded using 'insmod' int init_module() { nfho.hook = hook_func; //function to call when conditions below met nfho.hooknum = NF_IP_PRE_ROUTING; //called right after packet recieved, first hook in Netfilter nfho.pf = PF_INET; //IPV4 packets nfho.priority = NF_IP_PRI_FIRST; //set to highest priority over all other hook functions nf_register_hook(&nfho); //register hook return 0; //return 0 for success } //Called when module unloaded using 'rmmod' void cleanup_module() { nf_unregister_hook(&nfho); //cleanup – unregister hook } Here are the error message: $ make make -C /lib/modules/3.3.2-6.fc16.x86_64/build M=/home/fabio/Desktop/modules modules make[1]: Entering directory `/usr/src/kernels/3.3.2-6.fc16.x86_64' CC [M] /home/fabio/Desktop/modules/hello.o /home/fabio/Desktop/modules/hello.c: In function ‘init_module’: /home/fabio/Desktop/modules/hello.c:18:13: warning: assignment from incompatible pointer type [enabled by default] /home/fabio/Desktop/modules/hello.c:19:18: error: ‘NF_IP_PRE_ROUTING’ undeclared (first use in this function) /home/fabio/Desktop/modules/hello.c:19:18: note: each undeclared identifier is reported only once for each function it appears in make[2]: *** [/home/fabio/Desktop/modules/hello.o] Error 1 make[1]: *** [_module_/home/fabio/Desktop/modules] Error 2 make[1]: Leaving directory `/usr/src/kernels/3.3.2-6.fc16.x86_64' make: *** [all] Error 2 |
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