1. 根目录:
2. include
3. linux
4. netfilter
5. xt_comment.h

#ifndef _XT_COMMENT_H
#define _XT_COMMENT_H

#define XT_MAX_COMMENT_LEN 256

struct xt_comment_info {
	char comment[XT_MAX_COMMENT_LEN];
};

#endif /* XT_COMMENT_H */