![Simon Wunderlich](/assets/img/avatar_default.png)
While testing, we got something like this: WARNING: CPU: 0 PID: 238 at net/batman-adv/multicast.c:142 batadv_mcast_mla_tt_retract+0x94/0x205 [batman_adv]() [...] Call Trace: [<ffffffff815fc597>] dump_stack+0x4b/0x64 [<ffffffff810b34dc>] warn_slowpath_common+0xbc/0x120 [<ffffffffa0024ec5>] ? batadv_mcast_mla_tt_retract+0x94/0x205 [batman_adv] [<ffffffff810b3705>] warn_slowpath_null+0x15/0x20 [<ffffffffa0024ec5>] batadv_mcast_mla_tt_retract+0x94/0x205 [batman_adv] [<ffffffffa00273fe>] batadv_mcast_free+0x36/0x39 [batman_adv] [<ffffffffa0020c77>] batadv_mesh_free+0x7d/0x13f [batman_adv] [<ffffffffa0036a6b>] batadv_softif_free+0x15/0x25 [batman_adv] [...] Signed-off-by: Simon Wunderlich <simon@open-mesh.com> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <a@unstable.cc>
830 lines
25 KiB
C
830 lines
25 KiB
C
/* Copyright (C) 2014-2015 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 "multicast.h"
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <linux/byteorder/generic.h>
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#include <linux/errno.h>
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#include <linux/etherdevice.h>
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#include <linux/fs.h>
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#include <linux/if_ether.h>
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#include <linux/in6.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/netdevice.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <net/addrconf.h>
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#include <net/ipv6.h>
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#include "packet.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(u8 *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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* @bat_priv: the bat priv with all the soft interface information
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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 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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lockdep_assert_held(&bat_priv->tt.commit_lock);
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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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lockdep_assert_held(&bat_priv->tt.commit_lock);
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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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lockdep_assert_held(&bat_priv->tt.commit_lock);
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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_tvlv_update - update multicast tvlv
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* @bat_priv: the bat priv with all the soft interface information
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*
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* Updates the own multicast tvlv with our current multicast related settings,
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* capabilities and inabilities.
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*
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* Returns true if the tvlv container is registered afterwards. Otherwise
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* returns false.
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*/
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static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv)
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{
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struct batadv_tvlv_mcast_data mcast_data;
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mcast_data.flags = BATADV_NO_FLAGS;
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memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved));
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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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if (bat_priv->mcast.enabled) {
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batadv_tvlv_container_unregister(bat_priv,
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BATADV_TVLV_MCAST, 1);
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bat_priv->mcast.enabled = false;
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}
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return false;
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}
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if (!bat_priv->mcast.enabled ||
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mcast_data.flags != bat_priv->mcast.flags) {
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batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 1,
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&mcast_data, sizeof(mcast_data));
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bat_priv->mcast.flags = mcast_data.flags;
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bat_priv->mcast.enabled = true;
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}
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return true;
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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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* Updates the own multicast listener announcements in the translation
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* table as well as the own, announced multicast tvlv container.
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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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if (!batadv_mcast_mla_tvlv_update(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(bat_priv, &mcast_list);
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}
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/**
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* batadv_mcast_forw_mode_check_ipv4 - 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 IPv4 packet to check
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* @is_unsnoopable: stores whether the destination is snoopable
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*
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* Checks whether the given IPv4 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 in case of
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* memory allocation failure.
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*/
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static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv,
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struct sk_buff *skb,
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bool *is_unsnoopable)
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{
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struct iphdr *iphdr;
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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(*iphdr)))
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return -ENOMEM;
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iphdr = ip_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 (!ipv4_is_local_multicast(iphdr->daddr))
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return -EINVAL;
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/* link-local multicast listeners behind a bridge are
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* not snoopable (see RFC4541, section 2.1.2.2)
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*/
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*is_unsnoopable = true;
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return 0;
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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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* @is_unsnoopable: stores whether the destination is snoopable
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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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bool *is_unsnoopable)
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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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*is_unsnoopable = true;
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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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* @is_unsnoopable: stores whether the destination is snoopable
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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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bool *is_unsnoopable)
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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_IP:
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return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb,
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is_unsnoopable);
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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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is_unsnoopable);
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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_want_all_ip_count - count nodes with unspecific mcast interest
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* @bat_priv: the bat priv with all the soft interface information
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* @ethhdr: ethernet header of a packet
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*
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* Returns the number of nodes which want all IPv4 multicast traffic if the
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* given ethhdr is from an IPv4 packet or the number of nodes which want all
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* IPv6 traffic if it matches an IPv6 packet.
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*/
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static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv,
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struct ethhdr *ethhdr)
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{
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switch (ntohs(ethhdr->h_proto)) {
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case ETH_P_IP:
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return atomic_read(&bat_priv->mcast.num_want_all_ipv4);
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case ETH_P_IPV6:
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return atomic_read(&bat_priv->mcast.num_want_all_ipv6);
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default:
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/* we shouldn't be here... */
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return 0;
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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_want_forw_ipv4_node_get - get a node with an ipv4 flag
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* @bat_priv: the bat priv with all the soft interface information
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*
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* Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and
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* increases its refcount.
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*/
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static struct batadv_orig_node *
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batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv)
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{
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struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
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rcu_read_lock();
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hlist_for_each_entry_rcu(tmp_orig_node,
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&bat_priv->mcast.want_all_ipv4_list,
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mcast_want_all_ipv4_node) {
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if (!atomic_inc_not_zero(&tmp_orig_node->refcount))
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continue;
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orig_node = tmp_orig_node;
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break;
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}
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rcu_read_unlock();
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return orig_node;
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}
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/**
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* batadv_mcast_want_forw_ipv6_node_get - get a node with an ipv6 flag
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* @bat_priv: the bat priv with all the soft interface information
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*
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* Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set
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* and increases its refcount.
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*/
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static struct batadv_orig_node *
|
|
batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tmp_orig_node,
|
|
&bat_priv->mcast.want_all_ipv6_list,
|
|
mcast_want_all_ipv6_node) {
|
|
if (!atomic_inc_not_zero(&tmp_orig_node->refcount))
|
|
continue;
|
|
|
|
orig_node = tmp_orig_node;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return orig_node;
|
|
}
|
|
|
|
/**
|
|
* batadv_mcast_want_forw_ip_node_get - get a node with an ipv4/ipv6 flag
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @ethhdr: an ethernet header to determine the protocol family from
|
|
*
|
|
* Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or
|
|
* BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and
|
|
* increases its refcount.
|
|
*/
|
|
static struct batadv_orig_node *
|
|
batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv,
|
|
struct ethhdr *ethhdr)
|
|
{
|
|
switch (ntohs(ethhdr->h_proto)) {
|
|
case ETH_P_IP:
|
|
return batadv_mcast_forw_ipv4_node_get(bat_priv);
|
|
case ETH_P_IPV6:
|
|
return batadv_mcast_forw_ipv6_node_get(bat_priv);
|
|
default:
|
|
/* we shouldn't be here... */
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_mcast_want_forw_unsnoop_node_get - get a node with an unsnoopable flag
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*
|
|
* Returns an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag
|
|
* set and increases its refcount.
|
|
*/
|
|
static struct batadv_orig_node *
|
|
batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tmp_orig_node,
|
|
&bat_priv->mcast.want_all_unsnoopables_list,
|
|
mcast_want_all_unsnoopables_node) {
|
|
if (!atomic_inc_not_zero(&tmp_orig_node->refcount))
|
|
continue;
|
|
|
|
orig_node = tmp_orig_node;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return orig_node;
|
|
}
|
|
|
|
/**
|
|
* batadv_mcast_forw_mode - check on how to forward a multicast packet
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: The multicast packet to check
|
|
* @orig: an originator to be set to forward the skb to
|
|
*
|
|
* Returns the forwarding mode as enum batadv_forw_mode and in case of
|
|
* BATADV_FORW_SINGLE set the orig to the single originator the skb
|
|
* should be forwarded to.
|
|
*/
|
|
enum batadv_forw_mode
|
|
batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
|
|
struct batadv_orig_node **orig)
|
|
{
|
|
int ret, tt_count, ip_count, unsnoop_count, total_count;
|
|
bool is_unsnoopable = false;
|
|
struct ethhdr *ethhdr;
|
|
|
|
ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable);
|
|
if (ret == -ENOMEM)
|
|
return BATADV_FORW_NONE;
|
|
else if (ret < 0)
|
|
return BATADV_FORW_ALL;
|
|
|
|
ethhdr = eth_hdr(skb);
|
|
|
|
tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest,
|
|
BATADV_NO_FLAGS);
|
|
ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr);
|
|
unsnoop_count = !is_unsnoopable ? 0 :
|
|
atomic_read(&bat_priv->mcast.num_want_all_unsnoopables);
|
|
|
|
total_count = tt_count + ip_count + unsnoop_count;
|
|
|
|
switch (total_count) {
|
|
case 1:
|
|
if (tt_count)
|
|
*orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr);
|
|
else if (ip_count)
|
|
*orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr);
|
|
else if (unsnoop_count)
|
|
*orig = batadv_mcast_forw_unsnoop_node_get(bat_priv);
|
|
|
|
if (*orig)
|
|
return BATADV_FORW_SINGLE;
|
|
|
|
/* fall through */
|
|
case 0:
|
|
return BATADV_FORW_NONE;
|
|
default:
|
|
return BATADV_FORW_ALL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_mcast_want_unsnoop_update - update unsnoop counter and list
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig: the orig_node which multicast state might have changed of
|
|
* @mcast_flags: flags indicating the new multicast state
|
|
*
|
|
* If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator,
|
|
* orig, has toggled then this method updates counter and list accordingly.
|
|
*
|
|
* Caller needs to hold orig->mcast_handler_lock.
|
|
*/
|
|
static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig,
|
|
u8 mcast_flags)
|
|
{
|
|
struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node;
|
|
struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list;
|
|
|
|
lockdep_assert_held(&orig->mcast_handler_lock);
|
|
|
|
/* switched from flag unset to set */
|
|
if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
|
|
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) {
|
|
atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables);
|
|
|
|
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
|
|
/* flag checks above + mcast_handler_lock prevents this */
|
|
WARN_ON(!hlist_unhashed(node));
|
|
|
|
hlist_add_head_rcu(node, head);
|
|
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
|
|
/* switched from flag set to unset */
|
|
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) &&
|
|
orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) {
|
|
atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables);
|
|
|
|
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
|
|
/* flag checks above + mcast_handler_lock prevents this */
|
|
WARN_ON(hlist_unhashed(node));
|
|
|
|
hlist_del_init_rcu(node);
|
|
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig: the orig_node which multicast state might have changed of
|
|
* @mcast_flags: flags indicating the new multicast state
|
|
*
|
|
* If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has
|
|
* toggled then this method updates counter and list accordingly.
|
|
*
|
|
* Caller needs to hold orig->mcast_handler_lock.
|
|
*/
|
|
static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig,
|
|
u8 mcast_flags)
|
|
{
|
|
struct hlist_node *node = &orig->mcast_want_all_ipv4_node;
|
|
struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list;
|
|
|
|
lockdep_assert_held(&orig->mcast_handler_lock);
|
|
|
|
/* switched from flag unset to set */
|
|
if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 &&
|
|
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) {
|
|
atomic_inc(&bat_priv->mcast.num_want_all_ipv4);
|
|
|
|
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
|
|
/* flag checks above + mcast_handler_lock prevents this */
|
|
WARN_ON(!hlist_unhashed(node));
|
|
|
|
hlist_add_head_rcu(node, head);
|
|
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
|
|
/* switched from flag set to unset */
|
|
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) &&
|
|
orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) {
|
|
atomic_dec(&bat_priv->mcast.num_want_all_ipv4);
|
|
|
|
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
|
|
/* flag checks above + mcast_handler_lock prevents this */
|
|
WARN_ON(hlist_unhashed(node));
|
|
|
|
hlist_del_init_rcu(node);
|
|
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig: the orig_node which multicast state might have changed of
|
|
* @mcast_flags: flags indicating the new multicast state
|
|
*
|
|
* If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has
|
|
* toggled then this method updates counter and list accordingly.
|
|
*
|
|
* Caller needs to hold orig->mcast_handler_lock.
|
|
*/
|
|
static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig,
|
|
u8 mcast_flags)
|
|
{
|
|
struct hlist_node *node = &orig->mcast_want_all_ipv6_node;
|
|
struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list;
|
|
|
|
lockdep_assert_held(&orig->mcast_handler_lock);
|
|
|
|
/* switched from flag unset to set */
|
|
if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 &&
|
|
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) {
|
|
atomic_inc(&bat_priv->mcast.num_want_all_ipv6);
|
|
|
|
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
|
|
/* flag checks above + mcast_handler_lock prevents this */
|
|
WARN_ON(!hlist_unhashed(node));
|
|
|
|
hlist_add_head_rcu(node, head);
|
|
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
|
|
/* switched from flag set to unset */
|
|
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) &&
|
|
orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) {
|
|
atomic_dec(&bat_priv->mcast.num_want_all_ipv6);
|
|
|
|
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
|
|
/* flag checks above + mcast_handler_lock prevents this */
|
|
WARN_ON(hlist_unhashed(node));
|
|
|
|
hlist_del_init_rcu(node);
|
|
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_mcast_tvlv_ogm_handler_v1 - process incoming multicast tvlv container
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig: the orig_node of the ogm
|
|
* @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
|
|
* @tvlv_value: tvlv buffer containing the multicast data
|
|
* @tvlv_value_len: tvlv buffer length
|
|
*/
|
|
static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig,
|
|
u8 flags,
|
|
void *tvlv_value,
|
|
u16 tvlv_value_len)
|
|
{
|
|
bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
|
|
u8 mcast_flags = BATADV_NO_FLAGS;
|
|
bool orig_initialized;
|
|
|
|
if (orig_mcast_enabled && tvlv_value &&
|
|
(tvlv_value_len >= sizeof(mcast_flags)))
|
|
mcast_flags = *(u8 *)tvlv_value;
|
|
|
|
spin_lock_bh(&orig->mcast_handler_lock);
|
|
orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
|
|
&orig->capa_initialized);
|
|
|
|
/* If mcast support is turned on decrease the disabled mcast node
|
|
* counter only if we had increased it for this node before. If this
|
|
* is a completely new orig_node no need to decrease the counter.
|
|
*/
|
|
if (orig_mcast_enabled &&
|
|
!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
|
|
if (orig_initialized)
|
|
atomic_dec(&bat_priv->mcast.num_disabled);
|
|
set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
|
|
/* If mcast support is being switched off or if this is an initial
|
|
* OGM without mcast support then increase the disabled mcast
|
|
* node counter.
|
|
*/
|
|
} else if (!orig_mcast_enabled &&
|
|
(test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) ||
|
|
!orig_initialized)) {
|
|
atomic_inc(&bat_priv->mcast.num_disabled);
|
|
clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
|
|
}
|
|
|
|
set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized);
|
|
|
|
batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags);
|
|
batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags);
|
|
batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags);
|
|
|
|
orig->mcast_flags = mcast_flags;
|
|
spin_unlock_bh(&orig->mcast_handler_lock);
|
|
}
|
|
|
|
/**
|
|
* batadv_mcast_init - initialize the multicast optimizations structures
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*/
|
|
void batadv_mcast_init(struct batadv_priv *bat_priv)
|
|
{
|
|
batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler_v1,
|
|
NULL, BATADV_TVLV_MCAST, 1,
|
|
BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
|
|
}
|
|
|
|
/**
|
|
* 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_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 1);
|
|
batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 1);
|
|
|
|
spin_lock_bh(&bat_priv->tt.commit_lock);
|
|
batadv_mcast_mla_tt_retract(bat_priv, NULL);
|
|
spin_unlock_bh(&bat_priv->tt.commit_lock);
|
|
}
|
|
|
|
/**
|
|
* batadv_mcast_purge_orig - reset originator global mcast state modifications
|
|
* @orig: the originator which is going to get purged
|
|
*/
|
|
void batadv_mcast_purge_orig(struct batadv_orig_node *orig)
|
|
{
|
|
struct batadv_priv *bat_priv = orig->bat_priv;
|
|
|
|
spin_lock_bh(&orig->mcast_handler_lock);
|
|
|
|
if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) &&
|
|
test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized))
|
|
atomic_dec(&bat_priv->mcast.num_disabled);
|
|
|
|
batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS);
|
|
batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS);
|
|
batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS);
|
|
|
|
spin_unlock_bh(&orig->mcast_handler_lock);
|
|
}
|