mirror of
https://github.com/torvalds/linux.git
synced 2024-12-02 17:11:33 +00:00
9003913322
Implement the preparation of a batman-adv multicast packet and use this under certain conditions. For one thing this implements the capability to push a complete batman-adv multicast packet header, including a tracker TVLV with all originator destinations that have signaled interest in it, onto a given ethernet frame with an IP multicast packet inside. For another checks are implemented to determine if encapsulating a multicast packet in this new batman-adv multicast packet type and using it is feasible. Those checks are: 1) Have all nodes signaled that they are capable of handling the new batman-adv multicast packet type? 2) Do all active hard interfaces of all nodes, including us, have an MTU of at least 1280 bytes? 3) Does a complete multicast packet header with all its destination addresses fit onto the given multicast packet / ethernet frame and does not exceed 1280 bytes? If all checks passed then the new batman-adv multicast packet type will be used for transmission and distribution. Otherwise we fall back to one or more batman-adv unicast packet transmissions, if possible. Or if not possible we will fall back to classic flooding through a batman-adv broadcast packet. Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/* 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_ */
|