/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef NETLINK_HELPERS_H
#define NETLINK_HELPERS_H

#include <string.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>

struct rtnl_handle {
        int                     fd;
        struct sockaddr_nl      local;
        struct sockaddr_nl      peer;
        __u32                   seq;
        __u32                   dump;
        int                     proto;
        FILE                    *dump_fp;
#define RTNL_HANDLE_F_LISTEN_ALL_NSID           0x01
#define RTNL_HANDLE_F_SUPPRESS_NLERR            0x02
#define RTNL_HANDLE_F_STRICT_CHK                0x04
        int                     flags;
};

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

typedef int (*nl_ext_ack_fn_t)(const char *errmsg, uint32_t off,
                               const struct nlmsghdr *inner_nlh);

int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
              __attribute__((warn_unused_result));
void rtnl_close(struct rtnl_handle *rth);
int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
              struct nlmsghdr **answer)
              __attribute__((warn_unused_result));

int addattr(struct nlmsghdr *n, int maxlen, int type);
int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
#endif /* NETLINK_HELPERS_H */