#ifndef __LINUX_RTNETLINK_H
#define __LINUX_RTNETLINK_H

struct rtattr {
	unsigned short  rta_len;
	unsigned short  rta_type;
};

/* Macros to handle rtattributes */

#define RTA_ALIGNTO     4
#define RTA_ALIGN(len) ( ((len)+RTA_ALIGNTO-1) & ~(RTA_ALIGNTO-1) )
#define RTA_OK(rta,len) ((len) >= (int)sizeof(struct rtattr) && \
		(rta)->rta_len >= sizeof(struct rtattr) && \
		(rta)->rta_len <= (len))
#define RTA_NEXT(rta,attrlen)   ((attrlen) -= RTA_ALIGN((rta)->rta_len), \
		(struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
#define RTA_LENGTH(len) (RTA_ALIGN(sizeof(struct rtattr)) + (len))
#define RTA_SPACE(len)  RTA_ALIGN(RTA_LENGTH(len))
#define RTA_DATA(rta)   ((void*)(((char*)(rta)) + RTA_LENGTH(0)))
#define RTA_PAYLOAD(rta) ((int)((rta)->rta_len) - RTA_LENGTH(0))

#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
#define NLMSG_HDRLEN     ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
#define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
#define NLMSG_NEXT(nlh,len)      ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
		(struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
		(nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
		(nlh)->nlmsg_len <= (len))
#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))

#define NLMSG_NOOP              0x1     /* Nothing.             */
#define NLMSG_ERROR             0x2     /* Error                */
#define NLMSG_DONE              0x3     /* End of a dump        */
#define NLMSG_OVERRUN           0x4     /* Data lost            */

#define NLMSG_MIN_TYPE          0x10    /* < 0x10: reserved control messages */


int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
int nlmsg_receive(char *buf, int len, int (*cb)(struct nlmsghdr *));

#endif