/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) B.A.T.M.A.N. contributors:
 *
 * Linus Lüssing
 */

#ifndef _NET_BATMAN_ADV_MULTICAST_H_
#define _NET_BATMAN_ADV_MULTICAST_H_

#include "main.h"

#include <linux/netlink.h>
#include <linux/skbuff.h>
#include <linux/types.h>

/**
 * enum batadv_forw_mode - the way a packet should be forwarded as
 */
enum batadv_forw_mode {
        /**
         * @BATADV_FORW_BCAST: forward the packet to all nodes via a batman-adv
         *  broadcast packet
         */
        BATADV_FORW_BCAST,

        /**
         * @BATADV_FORW_UCASTS: forward the packet to some nodes via one
         *  or more batman-adv unicast packets
         */
        BATADV_FORW_UCASTS,

        /**
         * @BATADV_FORW_MCAST: forward the packet to some nodes via a
         *  batman-adv multicast packet
         */
        BATADV_FORW_MCAST,

        /** @BATADV_FORW_NONE: don't forward, drop it */
        BATADV_FORW_NONE,
};

#ifdef CONFIG_BATMAN_ADV_MCAST

enum batadv_forw_mode
batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
                       unsigned short vid, int *is_routable);

int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
                           unsigned short vid, int is_routable);

void batadv_mcast_init(struct batadv_priv *bat_priv);

int batadv_mcast_mesh_info_put(struct sk_buff *msg,
                               struct batadv_priv *bat_priv);

int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb);

void batadv_mcast_free(struct batadv_priv *bat_priv);

void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node);

/* multicast_forw.c */

int batadv_mcast_forw_tracker_tvlv_handler(struct batadv_priv *bat_priv,
                                           struct sk_buff *skb);

unsigned int batadv_mcast_forw_packet_hdrlen(unsigned int num_dests);

bool batadv_mcast_forw_push(struct batadv_priv *bat_priv, struct sk_buff *skb,
                            unsigned short vid, int is_routable, int count);

int batadv_mcast_forw_mcsend(struct batadv_priv *bat_priv, struct sk_buff *skb);

#else

static inline enum batadv_forw_mode
batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
                       unsigned short vid, int *is_routable)
{
        return BATADV_FORW_BCAST;
}

static inline int
batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
                       unsigned short vid, int is_routable)
{
        kfree_skb(skb);
        return NET_XMIT_DROP;
}

static inline int batadv_mcast_init(struct batadv_priv *bat_priv)
{
        return 0;
}

static inline int
batadv_mcast_mesh_info_put(struct sk_buff *msg, struct batadv_priv *bat_priv)
{
        return 0;
}

static inline int batadv_mcast_flags_dump(struct sk_buff *msg,
                                          struct netlink_callback *cb)
{
        return -EOPNOTSUPP;
}

static inline void batadv_mcast_free(struct batadv_priv *bat_priv)
{
}

static inline void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node)
{
}

static inline int batadv_mcast_forw_mcsend(struct batadv_priv *bat_priv,
                                           struct sk_buff *skb)
{
        kfree_skb(skb);
        return NET_XMIT_DROP;
}

#endif /* CONFIG_BATMAN_ADV_MCAST */

#endif /* _NET_BATMAN_ADV_MULTICAST_H_ */