linux-stable/net/batman-adv/routing.h
Linus Lüssing 07afe1ba28 batman-adv: mcast: implement multicast packet reception and forwarding
Implement functionality to receive and forward a new TVLV capable
multicast packet type.

The new batman-adv multicast packet type allows to contain several
originator destination addresses within a TVLV. Routers on the way will
potentially split the batman-adv multicast packet and adjust its tracker
TVLV contents.

Routing decisions are still based on the selected BATMAN IV or BATMAN V
routing algorithm. So this new batman-adv multicast packet type retains
the same loop-free properties.

Also a new OGM multicast TVLV flag is introduced to signal to other
nodes that we are capable of handling a batman-adv multicast packet and
multicast tracker TVLV. And that all of our hard interfaces have an MTU
of at least 1280 bytes (IPv6 minimum MTU), as a simple solution for now
to avoid MTU issues while forwarding.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2023-11-14 08:16:34 +01:00

53 lines
1.8 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*/
#ifndef _NET_BATMAN_ADV_ROUTING_H_
#define _NET_BATMAN_ADV_ROUTING_H_
#include "main.h"
#include <linux/skbuff.h>
#include <linux/types.h>
bool batadv_check_management_packet(struct sk_buff *skb,
struct batadv_hard_iface *hard_iface,
int header_len);
void batadv_update_route(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
struct batadv_hard_iface *recv_if,
struct batadv_neigh_node *neigh_node);
int batadv_recv_icmp_packet(struct sk_buff *skb,
struct batadv_hard_iface *recv_if);
int batadv_recv_unicast_packet(struct sk_buff *skb,
struct batadv_hard_iface *recv_if);
int batadv_recv_frag_packet(struct sk_buff *skb,
struct batadv_hard_iface *iface);
int batadv_recv_bcast_packet(struct sk_buff *skb,
struct batadv_hard_iface *recv_if);
#ifdef CONFIG_BATMAN_ADV_MCAST
int batadv_recv_mcast_packet(struct sk_buff *skb,
struct batadv_hard_iface *recv_if);
#else
static inline int batadv_recv_mcast_packet(struct sk_buff *skb,
struct batadv_hard_iface *recv_if)
{
kfree_skb(skb);
return NET_RX_DROP;
}
#endif
int batadv_recv_unicast_tvlv(struct sk_buff *skb,
struct batadv_hard_iface *recv_if);
int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb,
struct batadv_hard_iface *recv_if);
struct batadv_neigh_node *
batadv_find_router(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
struct batadv_hard_iface *recv_if);
bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff,
s32 seq_old_max_diff, unsigned long *last_reset,
bool *protection_started);
#endif /* _NET_BATMAN_ADV_ROUTING_H_ */