libnetlink.h

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#ifndef __LIBNETLINK_H__
#define __LIBNETLINK_H__ 1

#include <asm/types.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>

struct rtnl_handle
{
    int         fd;
    struct sockaddr_nl  local;
    struct sockaddr_nl  peer;
    uint32_t        seq;
    uint32_t        dump;
};

extern int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions);
extern int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions, int protocol);
extern void rtnl_close(struct rtnl_handle *rth);
extern int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type);
extern int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len);

typedef int (*rtnl_filter_t)(const struct sockaddr_nl *, 
                 struct nlmsghdr *n, void *);
extern int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter,
                void *arg1,
                rtnl_filter_t junk,
                void *arg2);
extern int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
             unsigned groups, struct nlmsghdr *answer,
             rtnl_filter_t junk,
             void *jarg);
extern int rtnl_send(struct rtnl_handle *rth, const char *buf, int);


extern int addattr32(struct nlmsghdr *n, int maxlen, int type, uint32_t data);
extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
extern int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
extern int rta_addattr32(struct rtattr *rta, int maxlen, int type, uint32_t data);
extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type, const void *data, int alen);

extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
extern int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len);

#define parse_rtattr_nested(tb, max, rta) \
    (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))

extern int rtnl_listen(struct rtnl_handle *, rtnl_filter_t handler, 
               void *jarg);
extern int rtnl_from_file(FILE *, rtnl_filter_t handler,
               void *jarg);

#define NLMSG_TAIL(nmsg) \
    ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))

#endif /* __LIBNETLINK_H__ */