batman-adv: Modified forwarding behaviour for multicast packets
With this patch a multicast packet is not always simply flooded anymore, the behaviour for the following cases is changed to reduce unnecessary overhead: If all nodes within the horizon of a certain node have signalized multicast listener announcement capability then an IPv6 multicast packet with a destination of IPv6 link-local scope (excluding ff02::1) coming from the upstream of this node... * ...is dropped if there is no according multicast listener in the translation table, * ...is forwarded via unicast if there is a single node with interested multicast listeners * ...and otherwise still gets flooded. Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
This commit is contained in:
Linus Lüssing
Antonio Quartulli
Родитель
60432d756c
Коммит
1d8ab8d3c1
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@ -76,6 +76,15 @@ Description:
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is used to classify clients as "isolated" by the
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Extended Isolation feature.
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What: /sys/class/net/<mesh_iface>/mesh/multicast_mode
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Date: Feb 2014
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Contact: Linus Lüssing <linus.luessing@web.de>
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Description:
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Indicates whether multicast optimizations are enabled
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or disabled. If set to zero then all nodes in the
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mesh are going to use classic flooding for any
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multicast packet with no optimizations.
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What: /sys/class/net/<mesh_iface>/mesh/network_coding
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Date: Nov 2012
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Contact: Martin Hundeboll <martin@hundeboll.net>
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@ -20,6 +20,7 @@
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#include "originator.h"
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#include "hard-interface.h"
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#include "translation-table.h"
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#include "multicast.h"
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/**
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* batadv_mcast_mla_softif_get - get softif multicast listeners
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@ -246,6 +247,131 @@ out:
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batadv_mcast_mla_list_free(&mcast_list);
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}
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/**
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* batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: the IPv6 packet to check
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*
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* Checks whether the given IPv6 packet has the potential to be forwarded with a
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* mode more optimal than classic flooding.
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*
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* If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out
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* of memory.
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*/
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static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv,
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struct sk_buff *skb)
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{
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struct ipv6hdr *ip6hdr;
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/* We might fail due to out-of-memory -> drop it */
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if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr)))
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return -ENOMEM;
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ip6hdr = ipv6_hdr(skb);
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/* TODO: Implement Multicast Router Discovery (RFC4286),
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* then allow scope > link local, too
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*/
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if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL)
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return -EINVAL;
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/* link-local-all-nodes multicast listeners behind a bridge are
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* not snoopable (see RFC4541, section 3, paragraph 3)
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*/
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if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr))
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return -EINVAL;
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return 0;
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}
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/**
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* batadv_mcast_forw_mode_check - check for optimized forwarding potential
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: the multicast frame to check
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*
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* Checks whether the given multicast ethernet frame has the potential to be
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* forwarded with a mode more optimal than classic flooding.
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*
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* If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out
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* of memory.
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*/
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static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv,
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struct sk_buff *skb)
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{
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struct ethhdr *ethhdr = eth_hdr(skb);
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if (!atomic_read(&bat_priv->multicast_mode))
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return -EINVAL;
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if (atomic_read(&bat_priv->mcast.num_disabled))
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return -EINVAL;
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switch (ntohs(ethhdr->h_proto)) {
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case ETH_P_IPV6:
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return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb);
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default:
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return -EINVAL;
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}
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}
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/**
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* batadv_mcast_forw_tt_node_get - get a multicast tt node
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* @bat_priv: the bat priv with all the soft interface information
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* @ethhdr: the ether header containing the multicast destination
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*
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* Returns an orig_node matching the multicast address provided by ethhdr
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* via a translation table lookup. This increases the returned nodes refcount.
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*/
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static struct batadv_orig_node *
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batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv,
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struct ethhdr *ethhdr)
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{
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return batadv_transtable_search(bat_priv, ethhdr->h_source,
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ethhdr->h_dest, BATADV_NO_FLAGS);
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}
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/**
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* batadv_mcast_forw_mode - check on how to forward a multicast packet
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: The multicast packet to check
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* @orig: an originator to be set to forward the skb to
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*
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* Returns the forwarding mode as enum batadv_forw_mode and in case of
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* BATADV_FORW_SINGLE set the orig to the single originator the skb
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* should be forwarded to.
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*/
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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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struct batadv_orig_node **orig)
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{
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struct ethhdr *ethhdr;
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int ret, tt_count;
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ret = batadv_mcast_forw_mode_check(bat_priv, skb);
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if (ret == -ENOMEM)
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return BATADV_FORW_NONE;
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else if (ret < 0)
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return BATADV_FORW_ALL;
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ethhdr = eth_hdr(skb);
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tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest,
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BATADV_NO_FLAGS);
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switch (tt_count) {
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case 1:
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*orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr);
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if (*orig)
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return BATADV_FORW_SINGLE;
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/* fall through */
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case 0:
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return BATADV_FORW_NONE;
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default:
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return BATADV_FORW_ALL;
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}
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}
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/**
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* batadv_mcast_tvlv_ogm_handler_v1 - process incoming multicast tvlv container
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* @bat_priv: the bat priv with all the soft interface information
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@ -18,10 +18,28 @@
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#ifndef _NET_BATMAN_ADV_MULTICAST_H_
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#define _NET_BATMAN_ADV_MULTICAST_H_
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/**
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* batadv_forw_mode - the way a packet should be forwarded as
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* @BATADV_FORW_ALL: forward the packet to all nodes (currently via classic
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* flooding)
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* @BATADV_FORW_SINGLE: forward the packet to a single node (currently via the
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* BATMAN unicast routing protocol)
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* @BATADV_FORW_NONE: don't forward, drop it
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*/
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enum batadv_forw_mode {
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BATADV_FORW_ALL,
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BATADV_FORW_SINGLE,
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BATADV_FORW_NONE,
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};
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#ifdef CONFIG_BATMAN_ADV_MCAST
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void batadv_mcast_mla_update(struct batadv_priv *bat_priv);
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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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struct batadv_orig_node **mcast_single_orig);
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void batadv_mcast_init(struct batadv_priv *bat_priv);
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void batadv_mcast_free(struct batadv_priv *bat_priv);
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@ -35,6 +53,13 @@ static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
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return;
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}
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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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struct batadv_orig_node **mcast_single_orig)
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{
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return BATADV_FORW_ALL;
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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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@ -248,11 +248,11 @@ out:
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*
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* Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
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*/
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static int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
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struct sk_buff *skb, int packet_type,
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int packet_subtype,
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struct batadv_orig_node *orig_node,
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unsigned short vid)
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int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
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struct sk_buff *skb, int packet_type,
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int packet_subtype,
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struct batadv_orig_node *orig_node,
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unsigned short vid)
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{
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struct ethhdr *ethhdr;
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struct batadv_unicast_packet *unicast_packet;
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@ -36,6 +36,11 @@ bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
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struct sk_buff *skb,
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struct batadv_orig_node *orig_node,
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int packet_subtype);
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int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
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struct sk_buff *skb, int packet_type,
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int packet_subtype,
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struct batadv_orig_node *orig_node,
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unsigned short vid);
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int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
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struct sk_buff *skb, int packet_type,
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int packet_subtype, uint8_t *dst_hint,
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@ -32,6 +32,7 @@
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#include <linux/ethtool.h>
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#include <linux/etherdevice.h>
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#include <linux/if_vlan.h>
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#include "multicast.h"
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#include "bridge_loop_avoidance.h"
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#include "network-coding.h"
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@ -170,6 +171,8 @@ static int batadv_interface_tx(struct sk_buff *skb,
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unsigned short vid;
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uint32_t seqno;
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int gw_mode;
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enum batadv_forw_mode forw_mode;
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struct batadv_orig_node *mcast_single_orig = NULL;
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if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
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goto dropped;
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@ -247,9 +250,19 @@ static int batadv_interface_tx(struct sk_buff *skb,
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* directed to a DHCP server
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*/
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goto dropped;
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}
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send:
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if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
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forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
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&mcast_single_orig);
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if (forw_mode == BATADV_FORW_NONE)
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goto dropped;
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if (forw_mode == BATADV_FORW_SINGLE)
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do_bcast = false;
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}
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}
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batadv_skb_set_priority(skb, 0);
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/* ethernet packet should be broadcasted */
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@ -301,6 +314,10 @@ send:
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if (ret)
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goto dropped;
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ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
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} else if (mcast_single_orig) {
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ret = batadv_send_skb_unicast(bat_priv, skb,
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BATADV_UNICAST, 0,
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mcast_single_orig, vid);
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} else {
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if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
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skb))
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@ -691,6 +708,7 @@ static int batadv_softif_init_late(struct net_device *dev)
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#endif
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#ifdef CONFIG_BATMAN_ADV_MCAST
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bat_priv->mcast.flags = BATADV_NO_FLAGS;
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atomic_set(&bat_priv->multicast_mode, 1);
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atomic_set(&bat_priv->mcast.num_disabled, 0);
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#endif
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atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
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@ -539,6 +539,9 @@ BATADV_ATTR_SIF_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, BATADV_TQ_MAX_VALUE,
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batadv_post_gw_reselect);
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static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
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batadv_store_gw_bwidth);
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#ifdef CONFIG_BATMAN_ADV_MCAST
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BATADV_ATTR_SIF_BOOL(multicast_mode, S_IRUGO | S_IWUSR, NULL);
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#endif
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#ifdef CONFIG_BATMAN_ADV_DEBUG
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BATADV_ATTR_SIF_UINT(log_level, S_IRUGO | S_IWUSR, 0, BATADV_DBG_ALL, NULL);
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#endif
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@ -557,6 +560,9 @@ static struct batadv_attribute *batadv_mesh_attrs[] = {
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#endif
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#ifdef CONFIG_BATMAN_ADV_DAT
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&batadv_attr_distributed_arp_table,
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#endif
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#ifdef CONFIG_BATMAN_ADV_MCAST
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&batadv_attr_multicast_mode,
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#endif
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&batadv_attr_fragmentation,
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&batadv_attr_routing_algo,
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@ -193,6 +193,31 @@ batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
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}
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}
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/**
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* batadv_tt_global_hash_count - count the number of orig entries
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* @hash: hash table containing the tt entries
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* @addr: the mac address of the client to count entries for
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* @vid: VLAN identifier
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*
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* Return the number of originators advertising the given address/data
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* (excluding ourself).
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*/
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int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
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const uint8_t *addr, unsigned short vid)
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{
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struct batadv_tt_global_entry *tt_global_entry;
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int count;
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tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
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if (!tt_global_entry)
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return 0;
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count = atomic_read(&tt_global_entry->orig_list_count);
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batadv_tt_global_entry_free_ref(tt_global_entry);
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return count;
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}
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static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
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{
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struct batadv_tt_orig_list_entry *orig_entry;
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@ -1225,6 +1250,8 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
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hlist_add_head_rcu(&orig_entry->list,
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&tt_global->orig_list);
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spin_unlock_bh(&tt_global->list_lock);
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atomic_inc(&tt_global->orig_list_count);
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out:
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if (orig_entry)
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batadv_tt_orig_list_entry_free_ref(orig_entry);
|
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|
@ -1298,6 +1325,7 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
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common->added_at = jiffies;
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INIT_HLIST_HEAD(&tt_global_entry->orig_list);
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atomic_set(&tt_global_entry->orig_list_count, 0);
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spin_lock_init(&tt_global_entry->list_lock);
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hash_added = batadv_hash_add(bat_priv->tt.global_hash,
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|
|
@ -1563,6 +1591,25 @@ out:
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return 0;
|
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}
|
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|
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/**
|
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* batadv_tt_global_del_orig_entry - remove and free an orig_entry
|
||||
* @tt_global_entry: the global entry to remove the orig_entry from
|
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* @orig_entry: the orig entry to remove and free
|
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*
|
||||
* Remove an orig_entry from its list in the given tt_global_entry and
|
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* free this orig_entry afterwards.
|
||||
*/
|
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static void
|
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batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
|
||||
struct batadv_tt_orig_list_entry *orig_entry)
|
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{
|
||||
batadv_tt_global_size_dec(orig_entry->orig_node,
|
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tt_global_entry->common.vid);
|
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atomic_dec(&tt_global_entry->orig_list_count);
|
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hlist_del_rcu(&orig_entry->list);
|
||||
batadv_tt_orig_list_entry_free_ref(orig_entry);
|
||||
}
|
||||
|
||||
/* deletes the orig list of a tt_global_entry */
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||||
static void
|
||||
batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
|
||||
|
|
@ -1573,20 +1620,26 @@ batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
|
|||
|
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spin_lock_bh(&tt_global_entry->list_lock);
|
||||
head = &tt_global_entry->orig_list;
|
||||
hlist_for_each_entry_safe(orig_entry, safe, head, list) {
|
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hlist_del_rcu(&orig_entry->list);
|
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batadv_tt_global_size_dec(orig_entry->orig_node,
|
||||
tt_global_entry->common.vid);
|
||||
batadv_tt_orig_list_entry_free_ref(orig_entry);
|
||||
}
|
||||
hlist_for_each_entry_safe(orig_entry, safe, head, list)
|
||||
batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
|
||||
spin_unlock_bh(&tt_global_entry->list_lock);
|
||||
}
|
||||
|
||||
/**
|
||||
* batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
|
||||
* @bat_priv: the bat priv with all the soft interface information
|
||||
* @tt_global_entry: the global entry to remove the orig_node from
|
||||
* @orig_node: the originator announcing the client
|
||||
* @message: message to append to the log on deletion
|
||||
*
|
||||
* Remove the given orig_node and its according orig_entry from the given
|
||||
* global tt entry.
|
||||
*/
|
||||
static void
|
||||
batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
|
||||
struct batadv_tt_global_entry *tt_global_entry,
|
||||
struct batadv_orig_node *orig_node,
|
||||
const char *message)
|
||||
batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
|
||||
struct batadv_tt_global_entry *tt_global_entry,
|
||||
struct batadv_orig_node *orig_node,
|
||||
const char *message)
|
||||
{
|
||||
struct hlist_head *head;
|
||||
struct hlist_node *safe;
|
||||
|
|
@ -1603,10 +1656,8 @@ batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
|
|||
orig_node->orig,
|
||||
tt_global_entry->common.addr,
|
||||
BATADV_PRINT_VID(vid), message);
|
||||
hlist_del_rcu(&orig_entry->list);
|
||||
batadv_tt_global_size_dec(orig_node,
|
||||
tt_global_entry->common.vid);
|
||||
batadv_tt_orig_list_entry_free_ref(orig_entry);
|
||||
batadv_tt_global_del_orig_entry(tt_global_entry,
|
||||
orig_entry);
|
||||
}
|
||||
}
|
||||
spin_unlock_bh(&tt_global_entry->list_lock);
|
||||
|
|
@ -1648,8 +1699,8 @@ batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
|
|||
/* there is another entry, we can simply delete this
|
||||
* one and can still use the other one.
|
||||
*/
|
||||
batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
|
||||
orig_node, message);
|
||||
batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
|
||||
orig_node, message);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -1675,8 +1726,8 @@ static void batadv_tt_global_del(struct batadv_priv *bat_priv,
|
|||
goto out;
|
||||
|
||||
if (!roaming) {
|
||||
batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
|
||||
orig_node, message);
|
||||
batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
|
||||
orig_node, message);
|
||||
|
||||
if (hlist_empty(&tt_global_entry->orig_list))
|
||||
batadv_tt_global_free(bat_priv, tt_global_entry,
|
||||
|
|
@ -1759,8 +1810,8 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
|
|||
struct batadv_tt_global_entry,
|
||||
common);
|
||||
|
||||
batadv_tt_global_del_orig_entry(bat_priv, tt_global,
|
||||
orig_node, message);
|
||||
batadv_tt_global_del_orig_node(bat_priv, tt_global,
|
||||
orig_node, message);
|
||||
|
||||
if (hlist_empty(&tt_global->orig_list)) {
|
||||
vid = tt_global->common.vid;
|
||||
|
|
|
|||
|
|
@ -29,6 +29,8 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset);
|
|||
void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
|
||||
struct batadv_orig_node *orig_node,
|
||||
int32_t match_vid, const char *message);
|
||||
int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
|
||||
const uint8_t *addr, unsigned short vid);
|
||||
struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
|
||||
const uint8_t *src,
|
||||
const uint8_t *addr,
|
||||
|
|
|
|||
|
|
@ -696,6 +696,8 @@ struct batadv_softif_vlan {
|
|||
* enabled
|
||||
* @distributed_arp_table: bool indicating whether distributed ARP table is
|
||||
* enabled
|
||||
* @multicast_mode: Enable or disable multicast optimizations on this node's
|
||||
* sender/originating side
|
||||
* @gw_mode: gateway operation: off, client or server (see batadv_gw_modes)
|
||||
* @gw_sel_class: gateway selection class (applies if gw_mode client)
|
||||
* @orig_interval: OGM broadcast interval in milliseconds
|
||||
|
|
@ -745,6 +747,9 @@ struct batadv_priv {
|
|||
#endif
|
||||
#ifdef CONFIG_BATMAN_ADV_DAT
|
||||
atomic_t distributed_arp_table;
|
||||
#endif
|
||||
#ifdef CONFIG_BATMAN_ADV_MCAST
|
||||
atomic_t multicast_mode;
|
||||
#endif
|
||||
atomic_t gw_mode;
|
||||
atomic_t gw_sel_class;
|
||||
|
|
@ -909,12 +914,14 @@ struct batadv_tt_local_entry {
|
|||
* struct batadv_tt_global_entry - translation table global entry data
|
||||
* @common: general translation table data
|
||||
* @orig_list: list of orig nodes announcing this non-mesh client
|
||||
* @orig_list_count: number of items in the orig_list
|
||||
* @list_lock: lock protecting orig_list
|
||||
* @roam_at: time at which TT_GLOBAL_ROAM was set
|
||||
*/
|
||||
struct batadv_tt_global_entry {
|
||||
struct batadv_tt_common_entry common;
|
||||
struct hlist_head orig_list;
|
||||
atomic_t orig_list_count;
|
||||
spinlock_t list_lock; /* protects orig_list */
|
||||
unsigned long roam_at;
|
||||
};
|
||||
|
|
|
|||
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