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https://github.com/torvalds/linux
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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 */
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/* Copyright (C) B.A.T.M.A.N. contributors:
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*
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* Linus Lüssing
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*/
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#ifndef _NET_BATMAN_ADV_MULTICAST_H_
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#define _NET_BATMAN_ADV_MULTICAST_H_
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#include "main.h"
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#include <linux/netlink.h>
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#include <linux/skbuff.h>
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#include <linux/types.h>
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/**
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* enum batadv_forw_mode - the way a packet should be forwarded as
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*/
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enum batadv_forw_mode {
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/**
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* @BATADV_FORW_BCAST: forward the packet to all nodes via a batman-adv
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* broadcast packet
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*/
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BATADV_FORW_BCAST,
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/**
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* @BATADV_FORW_UCASTS: forward the packet to some nodes via one
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* or more batman-adv unicast packets
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*/
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BATADV_FORW_UCASTS,
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/**
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* @BATADV_FORW_MCAST: forward the packet to some nodes via a
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* batman-adv multicast packet
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*/
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BATADV_FORW_MCAST,
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/** @BATADV_FORW_NONE: don't forward, drop it */
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BATADV_FORW_NONE,
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};
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#ifdef CONFIG_BATMAN_ADV_MCAST
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enum batadv_forw_mode
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batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
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unsigned short vid, int *is_routable);
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int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
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unsigned short vid, int is_routable);
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void batadv_mcast_init(struct batadv_priv *bat_priv);
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int batadv_mcast_mesh_info_put(struct sk_buff *msg,
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struct batadv_priv *bat_priv);
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int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb);
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void batadv_mcast_free(struct batadv_priv *bat_priv);
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void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node);
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/* multicast_forw.c */
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int batadv_mcast_forw_tracker_tvlv_handler(struct batadv_priv *bat_priv,
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struct sk_buff *skb);
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unsigned int batadv_mcast_forw_packet_hdrlen(unsigned int num_dests);
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bool batadv_mcast_forw_push(struct batadv_priv *bat_priv, struct sk_buff *skb,
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unsigned short vid, int is_routable, int count);
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int batadv_mcast_forw_mcsend(struct batadv_priv *bat_priv, struct sk_buff *skb);
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#else
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static inline enum batadv_forw_mode
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batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
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unsigned short vid, int *is_routable)
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{
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return BATADV_FORW_BCAST;
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}
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static inline int
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batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
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unsigned short vid, int is_routable)
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{
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kfree_skb(skb);
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return NET_XMIT_DROP;
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}
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static inline int batadv_mcast_init(struct batadv_priv *bat_priv)
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{
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return 0;
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}
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static inline int
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batadv_mcast_mesh_info_put(struct sk_buff *msg, struct batadv_priv *bat_priv)
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{
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return 0;
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}
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static inline int batadv_mcast_flags_dump(struct sk_buff *msg,
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struct netlink_callback *cb)
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{
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return -EOPNOTSUPP;
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}
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static inline void batadv_mcast_free(struct batadv_priv *bat_priv)
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{
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}
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static inline void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node)
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{
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}
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static inline int batadv_mcast_forw_mcsend(struct batadv_priv *bat_priv,
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struct sk_buff *skb)
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{
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kfree_skb(skb);
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return NET_XMIT_DROP;
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}
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#endif /* CONFIG_BATMAN_ADV_MCAST */
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#endif /* _NET_BATMAN_ADV_MULTICAST_H_ */
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