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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>
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Linus Lüssing
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Antonio Quartulli
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Mar 22, 2014
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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; | ||
|
|
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| 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); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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_ | ||
|
|
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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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| void batadv_mcast_free(struct batadv_priv *bat_priv); | ||
|
|
||
| #else | ||
|
|
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| 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_ */ |
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