/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _FIB_LOOKUP_H
#define _FIB_LOOKUP_H

#include <linux/types.h>
#include <linux/list.h>
#include <net/inet_dscp.h>
#include <net/ip_fib.h>
#include <net/nexthop.h>

struct fib_alias {
        struct hlist_node       fa_list;
        struct fib_info         *fa_info;
        dscp_t                  fa_dscp;
        u8                      fa_type;
        u8                      fa_state;
        u8                      fa_slen;
        u32                     tb_id;
        s16                     fa_default;
        u8                      offload;
        u8                      trap;
        u8                      offload_failed;
        struct rcu_head         rcu;
};

#define FA_S_ACCESSED   0x01

/* Don't write on fa_state unless needed, to keep it shared on all cpus */
static inline void fib_alias_accessed(struct fib_alias *fa)
{
        u8 fa_state = READ_ONCE(fa->fa_state);

        if (!(fa_state & FA_S_ACCESSED))
                WRITE_ONCE(fa->fa_state, fa_state | FA_S_ACCESSED);
}

/* Exported by fib_semantics.c */
void fib_release_info(struct fib_info *);
struct fib_info *fib_create_info(struct fib_config *cfg,
                                 struct netlink_ext_ack *extack);
int fib_nh_match(struct net *net, struct fib_config *cfg, struct fib_info *fi,
                 struct netlink_ext_ack *extack);
bool fib_metrics_match(struct fib_config *cfg, struct fib_info *fi);
int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
                  const struct fib_rt_info *fri, unsigned int flags);
void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, int dst_len,
               u32 tb_id, const struct nl_info *info, unsigned int nlm_flags);
size_t fib_nlmsg_size(struct fib_info *fi);

static inline void fib_result_assign(struct fib_result *res,
                                     struct fib_info *fi)
{
        /* we used to play games with refcounts, but we now use RCU */
        res->fi = fi;
        res->nhc = fib_info_nhc(fi, 0);
}

struct fib_prop {
        int     error;
        u8      scope;
};

extern const struct fib_prop fib_props[RTN_MAX + 1];

#endif /* _FIB_LOOKUP_H */