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batman-adv: Multicast Listener Announcements via Translation Table 

With this patch a node which has no bridge interface on top of its soft
interface announces its local multicast listeners via the translation
table.

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 2014-02-15 17:47:49 +01:00 committed by Antonio Quartulli
parent c5d3a652a3
commit c5caf4ef34
8 changed files with 318 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
net/batman-adv/Kconfig
View File

@ -50,6 +50,15 @@ config BATMAN_ADV_NC
If you think that your network does not need this feature you
can safely disable it and save some space.
config BATMAN_ADV_MCAST
bool "Multicast optimisation"
depends on BATMAN_ADV
default n
help
This option enables the multicast optimisation which aims to
reduce the air overhead while improving the reliability of
multicast messages.
config BATMAN_ADV_DEBUG
bool "B.A.T.M.A.N. debugging"
depends on BATMAN_ADV

1
net/batman-adv/Makefile
View File

@ -36,3 +36,4 @@ batman-adv-y += send.o
batman-adv-y += soft-interface.o
batman-adv-y += sysfs.o
batman-adv-y += translation-table.o
batman-adv-$(CONFIG_BATMAN_ADV_MCAST) += multicast.o

6
net/batman-adv/main.c
View File

@ -34,6 +34,7 @@
#include "gateway_client.h"
#include "bridge_loop_avoidance.h"
#include "distributed-arp-table.h"
#include "multicast.h"
#include "gateway_common.h"
#include "hash.h"
#include "bat_algo.h"
@ -120,6 +121,9 @@ int batadv_mesh_init(struct net_device *soft_iface)
INIT_LIST_HEAD(&bat_priv->tt.changes_list);
INIT_LIST_HEAD(&bat_priv->tt.req_list);
INIT_LIST_HEAD(&bat_priv->tt.roam_list);
#ifdef CONFIG_BATMAN_ADV_MCAST
INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
#endif
INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
@ -169,6 +173,8 @@ void batadv_mesh_free(struct net_device *soft_iface)
batadv_dat_free(bat_priv);
batadv_bla_free(bat_priv);
batadv_mcast_free(bat_priv);
/* Free the TT and the originator tables only after having terminated
* all the other depending components which may use these structures for
* their purposes.

1
net/batman-adv/main.h
View File

@ -176,6 +176,7 @@ enum batadv_uev_type {
#include <linux/percpu.h>
#include <linux/slab.h>
#include <net/sock.h> /* struct sock */
#include <net/addrconf.h> /* ipv6 address stuff */
#include <net/rtnetlink.h>
#include <linux/jiffies.h>
#include <linux/seq_file.h>

218
net/batman-adv/multicast.c Normal file
View File

@ -0,0 +1,218 @@
/* Copyright (C) 2014 B.A.T.M.A.N. contributors:
*
* Linus Lüssing
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "main.h"
#include "multicast.h"
#include "originator.h"
#include "hard-interface.h"
#include "translation-table.h"
/**
* batadv_mcast_mla_softif_get - get softif multicast listeners
* @dev: the device to collect multicast addresses from
* @mcast_list: a list to put found addresses into
*
* Collect multicast addresses of the local multicast listeners
* on the given soft interface, dev, in the given mcast_list.
*
* Returns -ENOMEM on memory allocation error or the number of
* items added to the mcast_list otherwise.
*/
static int batadv_mcast_mla_softif_get(struct net_device *dev,
struct hlist_head *mcast_list)
{
struct netdev_hw_addr *mc_list_entry;
struct batadv_hw_addr *new;
int ret = 0;
netif_addr_lock_bh(dev);
netdev_for_each_mc_addr(mc_list_entry, dev) {
new = kmalloc(sizeof(*new), GFP_ATOMIC);
if (!new) {
ret = -ENOMEM;
break;
}
ether_addr_copy(new->addr, mc_list_entry->addr);
hlist_add_head(&new->list, mcast_list);
ret++;
}
netif_addr_unlock_bh(dev);
return ret;
}
/**
* batadv_mcast_mla_is_duplicate - check whether an address is in a list
* @mcast_addr: the multicast address to check
* @mcast_list: the list with multicast addresses to search in
*
* Returns true if the given address is already in the given list.
* Otherwise returns false.
*/
static bool batadv_mcast_mla_is_duplicate(uint8_t *mcast_addr,
struct hlist_head *mcast_list)
{
struct batadv_hw_addr *mcast_entry;
hlist_for_each_entry(mcast_entry, mcast_list, list)
if (batadv_compare_eth(mcast_entry->addr, mcast_addr))
return true;
return false;
}
/**
* batadv_mcast_mla_list_free - free a list of multicast addresses
* @mcast_list: the list to free
*
* Removes and frees all items in the given mcast_list.
*/
static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list)
{
struct batadv_hw_addr *mcast_entry;
struct hlist_node *tmp;
hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
hlist_del(&mcast_entry->list);
kfree(mcast_entry);
}
}
/**
* batadv_mcast_mla_tt_retract - clean up multicast listener announcements
* @bat_priv: the bat priv with all the soft interface information
* @mcast_list: a list of addresses which should _not_ be removed
*
* Retracts the announcement of any multicast listener from the
* translation table except the ones listed in the given mcast_list.
*
* If mcast_list is NULL then all are retracted.
*/
static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
struct hlist_head *mcast_list)
{
struct batadv_hw_addr *mcast_entry;
struct hlist_node *tmp;
hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list,
list) {
if (mcast_list &&
batadv_mcast_mla_is_duplicate(mcast_entry->addr,
mcast_list))
continue;
batadv_tt_local_remove(bat_priv, mcast_entry->addr,
BATADV_NO_FLAGS,
"mcast TT outdated", false);
hlist_del(&mcast_entry->list);
kfree(mcast_entry);
}
}
/**
* batadv_mcast_mla_tt_add - add multicast listener announcements
* @bat_priv: the bat priv with all the soft interface information
* @mcast_list: a list of addresses which are going to get added
*
* Adds multicast listener announcements from the given mcast_list to the
* translation table if they have not been added yet.
*/
static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
struct hlist_head *mcast_list)
{
struct batadv_hw_addr *mcast_entry;
struct hlist_node *tmp;
if (!mcast_list)
return;
hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
if (batadv_mcast_mla_is_duplicate(mcast_entry->addr,
&bat_priv->mcast.mla_list))
continue;
if (!batadv_tt_local_add(bat_priv->soft_iface,
mcast_entry->addr, BATADV_NO_FLAGS,
BATADV_NULL_IFINDEX, BATADV_NO_MARK))
continue;
hlist_del(&mcast_entry->list);
hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list);
}
}
/**
* batadv_mcast_has_bridge - check whether the soft-iface is bridged
* @bat_priv: the bat priv with all the soft interface information
*
* Checks whether there is a bridge on top of our soft interface. Returns
* true if so, false otherwise.
*/
static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv)
{
struct net_device *upper = bat_priv->soft_iface;
rcu_read_lock();
do {
upper = netdev_master_upper_dev_get_rcu(upper);
} while (upper && !(upper->priv_flags & IFF_EBRIDGE));
rcu_read_unlock();
return upper;
}
/**
* batadv_mcast_mla_update - update the own MLAs
* @bat_priv: the bat priv with all the soft interface information
*
* Update the own multicast listener announcements in the translation
* table.
*/
void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
{
struct net_device *soft_iface = bat_priv->soft_iface;
struct hlist_head mcast_list = HLIST_HEAD_INIT;
int ret;
/* Avoid attaching MLAs, if there is a bridge on top of our soft
* interface, we don't support that yet (TODO)
*/
if (batadv_mcast_has_bridge(bat_priv))
goto update;
ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list);
if (ret < 0)
goto out;
update:
batadv_mcast_mla_tt_retract(bat_priv, &mcast_list);
batadv_mcast_mla_tt_add(bat_priv, &mcast_list);
out:
batadv_mcast_mla_list_free(&mcast_list);
}
/**
* batadv_mcast_free - free the multicast optimizations structures
* @bat_priv: the bat priv with all the soft interface information
*/
void batadv_mcast_free(struct batadv_priv *bat_priv)
{
batadv_mcast_mla_tt_retract(bat_priv, NULL);
}

41
net/batman-adv/multicast.h Normal file
View File

@ -0,0 +1,41 @@
/* Copyright (C) 2014 B.A.T.M.A.N. contributors:
*
* Linus Lüssing
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _NET_BATMAN_ADV_MULTICAST_H_
#define _NET_BATMAN_ADV_MULTICAST_H_
#ifdef CONFIG_BATMAN_ADV_MCAST
void batadv_mcast_mla_update(struct batadv_priv *bat_priv);
void batadv_mcast_free(struct batadv_priv *bat_priv);
#else
static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
{
return;
}
static inline void batadv_mcast_free(struct batadv_priv *bat_priv)
{
return;
}
#endif /* CONFIG_BATMAN_ADV_MCAST */
#endif /* _NET_BATMAN_ADV_MULTICAST_H_ */

22
net/batman-adv/translation-table.c
View File

@ -24,6 +24,7 @@
#include "originator.h"
#include "routing.h"
#include "bridge_loop_avoidance.h"
#include "multicast.h"
#include <linux/crc32c.h>
@ -484,7 +485,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
{
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
struct batadv_tt_local_entry *tt_local;
struct batadv_tt_global_entry *tt_global;
struct batadv_tt_global_entry *tt_global = NULL;
struct net_device *in_dev = NULL;
struct hlist_head *head;
struct batadv_tt_orig_list_entry *orig_entry;
@ -497,7 +498,9 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
in_dev = dev_get_by_index(&init_net, ifindex);
tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
if (!is_multicast_ether_addr(addr))
tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
if (tt_local) {
tt_local->last_seen = jiffies;
@ -562,8 +565,11 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
tt_local->last_seen = jiffies;
tt_local->common.added_at = tt_local->last_seen;
/* the batman interface mac address should never be purged */
if (batadv_compare_eth(addr, soft_iface->dev_addr))
/* the batman interface mac and multicast addresses should never be
* purged
*/
if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
is_multicast_ether_addr(addr))
tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
@ -1361,6 +1367,11 @@ add_orig_entry:
ret = true;
out_remove:
/* Do not remove multicast addresses from the local hash on
* global additions
*/
if (is_multicast_ether_addr(tt_addr))
goto out;
/* remove address from local hash if present */
local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
@ -3120,6 +3131,9 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
*/
static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
{
/* Update multicast addresses in local translation table */
batadv_mcast_mla_update(bat_priv);
if (atomic_read(&bat_priv->tt.local_changes) < 1) {
if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
batadv_tt_tvlv_container_update(bat_priv);

24
net/batman-adv/types.h
View File

@ -607,6 +607,16 @@ struct batadv_priv_dat {
};
#endif
#ifdef CONFIG_BATMAN_ADV_MCAST
/**
* struct batadv_priv_mcast - per mesh interface mcast data
* @mla_list: list of multicast addresses we are currently announcing via TT
*/
struct batadv_priv_mcast {
struct hlist_head mla_list;
};
#endif
/**
* struct batadv_priv_nc - per mesh interface network coding private data
* @work: work queue callback item for cleanup
@ -702,6 +712,7 @@ struct batadv_softif_vlan {
* @tt: translation table data
* @tvlv: type-version-length-value data
* @dat: distributed arp table data
* @mcast: multicast data
* @network_coding: bool indicating whether network coding is enabled
* @batadv_priv_nc: network coding data
*/
@ -759,6 +770,9 @@ struct batadv_priv {
#ifdef CONFIG_BATMAN_ADV_DAT
struct batadv_priv_dat dat;
#endif
#ifdef CONFIG_BATMAN_ADV_MCAST
struct batadv_priv_mcast mcast;
#endif
#ifdef CONFIG_BATMAN_ADV_NC
atomic_t network_coding;
struct batadv_priv_nc nc;
@ -1115,6 +1129,16 @@ struct batadv_dat_entry {
struct rcu_head rcu;
};
/**
* struct batadv_hw_addr - a list entry for a MAC address
* @list: list node for the linking of entries
* @addr: the MAC address of this list entry
*/
struct batadv_hw_addr {
struct hlist_node list;
unsigned char addr[ETH_ALEN];
};
/**
* struct batadv_dat_candidate - candidate destination for DAT operations
* @type: the type of the selected candidate. It can one of the following: