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
committed by
Antonio Quartulli
Antonio Quartulli
parent
c5d3a652a3
commit
c5caf4ef34
218
net/batman-adv/multicast.c
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218
net/batman-adv/multicast.c
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/* Copyright (C) 2014 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "main.h"
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#include "multicast.h"
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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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/**
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* batadv_mcast_mla_softif_get - get softif multicast listeners
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* @dev: the device to collect multicast addresses from
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* @mcast_list: a list to put found addresses into
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*
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* Collect multicast addresses of the local multicast listeners
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* on the given soft interface, dev, in the given mcast_list.
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*
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* Returns -ENOMEM on memory allocation error or the number of
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* items added to the mcast_list otherwise.
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*/
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static int batadv_mcast_mla_softif_get(struct net_device *dev,
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struct hlist_head *mcast_list)
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{
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struct netdev_hw_addr *mc_list_entry;
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struct batadv_hw_addr *new;
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int ret = 0;
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netif_addr_lock_bh(dev);
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netdev_for_each_mc_addr(mc_list_entry, dev) {
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new = kmalloc(sizeof(*new), GFP_ATOMIC);
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if (!new) {
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ret = -ENOMEM;
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break;
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}
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ether_addr_copy(new->addr, mc_list_entry->addr);
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hlist_add_head(&new->list, mcast_list);
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ret++;
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}
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netif_addr_unlock_bh(dev);
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return ret;
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}
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/**
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* batadv_mcast_mla_is_duplicate - check whether an address is in a list
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* @mcast_addr: the multicast address to check
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* @mcast_list: the list with multicast addresses to search in
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*
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* Returns true if the given address is already in the given list.
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* Otherwise returns false.
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*/
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static bool batadv_mcast_mla_is_duplicate(uint8_t *mcast_addr,
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struct hlist_head *mcast_list)
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{
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struct batadv_hw_addr *mcast_entry;
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hlist_for_each_entry(mcast_entry, mcast_list, list)
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if (batadv_compare_eth(mcast_entry->addr, mcast_addr))
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return true;
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return false;
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}
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/**
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* batadv_mcast_mla_list_free - free a list of multicast addresses
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* @mcast_list: the list to free
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*
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* Removes and frees all items in the given mcast_list.
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*/
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static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list)
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{
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struct batadv_hw_addr *mcast_entry;
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struct hlist_node *tmp;
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hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
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hlist_del(&mcast_entry->list);
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kfree(mcast_entry);
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}
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}
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/**
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* batadv_mcast_mla_tt_retract - clean up multicast listener announcements
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* @bat_priv: the bat priv with all the soft interface information
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* @mcast_list: a list of addresses which should _not_ be removed
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*
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* Retracts the announcement of any multicast listener from the
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* translation table except the ones listed in the given mcast_list.
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*
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* If mcast_list is NULL then all are retracted.
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*/
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static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
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struct hlist_head *mcast_list)
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{
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struct batadv_hw_addr *mcast_entry;
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struct hlist_node *tmp;
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hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list,
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list) {
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if (mcast_list &&
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batadv_mcast_mla_is_duplicate(mcast_entry->addr,
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mcast_list))
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continue;
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batadv_tt_local_remove(bat_priv, mcast_entry->addr,
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BATADV_NO_FLAGS,
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"mcast TT outdated", false);
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hlist_del(&mcast_entry->list);
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kfree(mcast_entry);
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}
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}
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/**
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* batadv_mcast_mla_tt_add - add multicast listener announcements
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* @bat_priv: the bat priv with all the soft interface information
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* @mcast_list: a list of addresses which are going to get added
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*
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* Adds multicast listener announcements from the given mcast_list to the
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* translation table if they have not been added yet.
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*/
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static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
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struct hlist_head *mcast_list)
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{
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struct batadv_hw_addr *mcast_entry;
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struct hlist_node *tmp;
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if (!mcast_list)
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return;
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hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
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if (batadv_mcast_mla_is_duplicate(mcast_entry->addr,
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&bat_priv->mcast.mla_list))
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continue;
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if (!batadv_tt_local_add(bat_priv->soft_iface,
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mcast_entry->addr, BATADV_NO_FLAGS,
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BATADV_NULL_IFINDEX, BATADV_NO_MARK))
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continue;
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hlist_del(&mcast_entry->list);
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hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list);
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}
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}
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/**
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* batadv_mcast_has_bridge - check whether the soft-iface is bridged
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* @bat_priv: the bat priv with all the soft interface information
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*
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* Checks whether there is a bridge on top of our soft interface. Returns
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* true if so, false otherwise.
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*/
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static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv)
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{
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struct net_device *upper = bat_priv->soft_iface;
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rcu_read_lock();
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do {
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upper = netdev_master_upper_dev_get_rcu(upper);
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} while (upper && !(upper->priv_flags & IFF_EBRIDGE));
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rcu_read_unlock();
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return upper;
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}
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/**
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* batadv_mcast_mla_update - update the own MLAs
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* @bat_priv: the bat priv with all the soft interface information
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*
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* Update the own multicast listener announcements in the translation
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* table.
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*/
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void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
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{
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struct net_device *soft_iface = bat_priv->soft_iface;
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struct hlist_head mcast_list = HLIST_HEAD_INIT;
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int ret;
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/* Avoid attaching MLAs, if there is a bridge on top of our soft
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* interface, we don't support that yet (TODO)
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*/
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if (batadv_mcast_has_bridge(bat_priv))
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goto update;
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ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list);
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if (ret < 0)
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goto out;
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update:
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batadv_mcast_mla_tt_retract(bat_priv, &mcast_list);
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batadv_mcast_mla_tt_add(bat_priv, &mcast_list);
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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_free - free the multicast optimizations structures
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* @bat_priv: the bat priv with all the soft interface information
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*/
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void batadv_mcast_free(struct batadv_priv *bat_priv)
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{
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batadv_mcast_mla_tt_retract(bat_priv, NULL);
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}
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