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#include <linux/kernel.h> | |
#include <linux/module.h> | |
#include <linux/kprobes.h> | |
#include <linux/kallsyms.h> | |
struct kprobe kp; | |
static int hander_pre(struct kprobe *p, struct pt_regs *regs) | |
{ | |
printk("Hit it\n"); | |
return 0; | |
} | |
static void hander_post(struct kprobe *p, struct pt_regs *regs, | |
unsigned long flags) | |
{ | |
} | |
static int __init kprobe_init(void) | |
{ | |
int ret; | |
kp.pre_handler = hander_pre; | |
kp.post_handler = hander_post; | |
kp.addr = (kprobe_opcode_t *) (kprobe_opcode_t *) kallsyms_lookup_name("ip_rcv"); | |
/* | |
* old kernel not have kallsyms_lookup_name(), then we have to manually get the addr | |
* by `cat /proc/kallsyms | awk '/ip_rcv$/ {print $1}'`, finally don't forget add "0x" | |
* eg : kp.addr = 0xffffffff81493ce0; | |
*/ | |
if (kp.addr == NULL) { | |
return 1; | |
} | |
ret = register_kprobe(&kp); | |
if (ret < 0) { | |
printk(KERN_INFO "register_kprobe failed, returned %d\n", ret); | |
return ret; | |
} | |
printk(KERN_INFO "Planted kprobe at %p\n", kp.addr); | |
return 0; | |
} | |
static void __exit kprobe_exit(void) | |
{ | |
unregister_kprobe(&kp); | |
printk(KERN_INFO "kprobe at %p unregistered\n", kp.addr); | |
} | |
module_init(kprobe_init); | |
module_exit(kprobe_exit); | |
MODULE_LICENSE("GPL"); |
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