1586 lines
47 KiB
C
1586 lines
47 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2014-2018 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/gfp.h>
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#include <linux/icmpv6.h>
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#include <linux/if_bridge.h>
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#include <linux/if_ether.h>
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#include <linux/igmp.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/kref.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/netlink.h>
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#include <linux/printk.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/seq_file.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 <linux/workqueue.h>
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#include <net/addrconf.h>
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#include <net/genetlink.h>
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#include <net/if_inet6.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/netlink.h>
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#include <net/sock.h>
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#include <uapi/linux/batadv_packet.h>
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#include <uapi/linux/batman_adv.h>
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#include "hard-interface.h"
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#include "hash.h"
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#include "log.h"
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#include "netlink.h"
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#include "soft-interface.h"
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#include "translation-table.h"
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#include "tvlv.h"
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static void batadv_mcast_mla_update(struct work_struct *work);
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/**
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* batadv_mcast_start_timer() - schedule the multicast periodic worker
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* @bat_priv: the bat priv with all the soft interface information
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*/
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static void batadv_mcast_start_timer(struct batadv_priv *bat_priv)
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{
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queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work,
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msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD));
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}
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/**
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* batadv_mcast_get_bridge() - get the bridge on top of the softif if it exists
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* @soft_iface: netdev struct of the mesh interface
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*
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* If the given soft interface has a bridge on top then the refcount
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* of the according net device is increased.
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*
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* Return: NULL if no such bridge exists. Otherwise the net device of the
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* bridge.
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*/
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static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface)
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{
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struct net_device *upper = 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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if (upper)
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dev_hold(upper);
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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_addr_is_ipv4() - check if multicast MAC is IPv4
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* @addr: the MAC address to check
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*
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* Return: True, if MAC address is one reserved for IPv4 multicast, false
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* otherwise.
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*/
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static bool batadv_mcast_addr_is_ipv4(const u8 *addr)
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{
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static const u8 prefix[] = {0x01, 0x00, 0x5E};
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return memcmp(prefix, addr, sizeof(prefix)) == 0;
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}
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/**
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* batadv_mcast_addr_is_ipv6() - check if multicast MAC is IPv6
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* @addr: the MAC address to check
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*
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* Return: True, if MAC address is one reserved for IPv6 multicast, false
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* otherwise.
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*/
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static bool batadv_mcast_addr_is_ipv6(const u8 *addr)
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{
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static const u8 prefix[] = {0x33, 0x33};
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return memcmp(prefix, addr, sizeof(prefix)) == 0;
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}
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/**
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* batadv_mcast_mla_softif_get() - get softif multicast listeners
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* @bat_priv: the bat priv with all the soft interface information
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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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* Collects multicast addresses of multicast listeners residing
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* on this kernel on the given soft interface, dev, in
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* the given mcast_list. In general, multicast listeners provided by
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* your multicast receiving applications run directly on this node.
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*
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* If there is a bridge interface on top of dev, collects from that one
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* instead. Just like with IP addresses and routes, multicast listeners
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* will(/should) register to the bridge interface instead of an
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* enslaved bat0.
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*
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* Return: -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 batadv_priv *bat_priv,
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struct net_device *dev,
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struct hlist_head *mcast_list)
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{
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bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4;
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bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6;
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struct net_device *bridge = batadv_mcast_get_bridge(dev);
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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(bridge ? bridge : dev);
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netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) {
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if (all_ipv4 && batadv_mcast_addr_is_ipv4(mc_list_entry->addr))
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continue;
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if (all_ipv6 && batadv_mcast_addr_is_ipv6(mc_list_entry->addr))
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continue;
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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(bridge ? bridge : dev);
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if (bridge)
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dev_put(bridge);
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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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* Return: 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_br_addr_cpy() - copy a bridge multicast address
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* @dst: destination to write to - a multicast MAC address
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* @src: source to read from - a multicast IP address
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*
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* Converts a given multicast IPv4/IPv6 address from a bridge
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* to its matching multicast MAC address and copies it into the given
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* destination buffer.
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*
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* Caller needs to make sure the destination buffer can hold
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* at least ETH_ALEN bytes.
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*/
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static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src)
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{
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if (src->proto == htons(ETH_P_IP))
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ip_eth_mc_map(src->u.ip4, dst);
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#if IS_ENABLED(CONFIG_IPV6)
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else if (src->proto == htons(ETH_P_IPV6))
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ipv6_eth_mc_map(&src->u.ip6, dst);
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#endif
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else
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eth_zero_addr(dst);
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}
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/**
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* batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners
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* @bat_priv: the bat priv with all the soft interface information
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* @dev: a bridge slave whose bridge 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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* Collects multicast addresses of multicast listeners residing
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* on foreign, non-mesh devices which we gave access to our mesh via
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* a bridge on top of the given soft interface, dev, in the given
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* mcast_list.
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*
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* Return: -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_bridge_get(struct batadv_priv *bat_priv,
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struct net_device *dev,
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struct hlist_head *mcast_list)
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{
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struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
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bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4;
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bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6;
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struct br_ip_list *br_ip_entry, *tmp;
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struct batadv_hw_addr *new;
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u8 mcast_addr[ETH_ALEN];
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int ret;
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/* we don't need to detect these devices/listeners, the IGMP/MLD
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* snooping code of the Linux bridge already does that for us
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*/
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ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
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if (ret < 0)
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goto out;
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list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) {
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if (all_ipv4 && br_ip_entry->addr.proto == htons(ETH_P_IP))
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continue;
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if (all_ipv6 && br_ip_entry->addr.proto == htons(ETH_P_IPV6))
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continue;
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batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr);
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if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
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continue;
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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, mcast_addr);
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hlist_add_head(&new->list, mcast_list);
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}
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out:
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list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
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list_del(&br_ip_entry->list);
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kfree(br_ip_entry);
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}
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return ret;
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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.
|
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*
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* Return: true if there is a bridge, false otherwise.
|
||
*/
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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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|
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return upper;
|
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}
|
||
|
||
/**
|
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* batadv_mcast_querier_log() - debug output regarding the querier status on
|
||
* link
|
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* @bat_priv: the bat priv with all the soft interface information
|
||
* @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD")
|
||
* @old_state: the previous querier state on our link
|
||
* @new_state: the new querier state on our link
|
||
*
|
||
* Outputs debug messages to the logging facility with log level 'mcast'
|
||
* regarding changes to the querier status on the link which are relevant
|
||
* to our multicast optimizations.
|
||
*
|
||
* Usually this is about whether a querier appeared or vanished in
|
||
* our mesh or whether the querier is in the suboptimal position of being
|
||
* behind our local bridge segment: Snooping switches will directly
|
||
* forward listener reports to the querier, therefore batman-adv and
|
||
* the bridge will potentially not see these listeners - the querier is
|
||
* potentially shadowing listeners from us then.
|
||
*
|
||
* This is only interesting for nodes with a bridge on top of their
|
||
* soft interface.
|
||
*/
|
||
static void
|
||
batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto,
|
||
struct batadv_mcast_querier_state *old_state,
|
||
struct batadv_mcast_querier_state *new_state)
|
||
{
|
||
if (!old_state->exists && new_state->exists)
|
||
batadv_info(bat_priv->soft_iface, "%s Querier appeared\n",
|
||
str_proto);
|
||
else if (old_state->exists && !new_state->exists)
|
||
batadv_info(bat_priv->soft_iface,
|
||
"%s Querier disappeared - multicast optimizations disabled\n",
|
||
str_proto);
|
||
else if (!bat_priv->mcast.bridged && !new_state->exists)
|
||
batadv_info(bat_priv->soft_iface,
|
||
"No %s Querier present - multicast optimizations disabled\n",
|
||
str_proto);
|
||
|
||
if (new_state->exists) {
|
||
if ((!old_state->shadowing && new_state->shadowing) ||
|
||
(!old_state->exists && new_state->shadowing))
|
||
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
|
||
"%s Querier is behind our bridged segment: Might shadow listeners\n",
|
||
str_proto);
|
||
else if (old_state->shadowing && !new_state->shadowing)
|
||
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
|
||
"%s Querier is not behind our bridged segment\n",
|
||
str_proto);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_bridge_log() - debug output for topology changes in bridged
|
||
* setups
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
* @bridged: a flag about whether the soft interface is currently bridged or not
|
||
* @querier_ipv4: (maybe) new status of a potential, selected IGMP querier
|
||
* @querier_ipv6: (maybe) new status of a potential, selected MLD querier
|
||
*
|
||
* If no bridges are ever used on this node, then this function does nothing.
|
||
*
|
||
* Otherwise this function outputs debug information to the 'mcast' log level
|
||
* which might be relevant to our multicast optimizations.
|
||
*
|
||
* More precisely, it outputs information when a bridge interface is added or
|
||
* removed from a soft interface. And when a bridge is present, it further
|
||
* outputs information about the querier state which is relevant for the
|
||
* multicast flags this node is going to set.
|
||
*/
|
||
static void
|
||
batadv_mcast_bridge_log(struct batadv_priv *bat_priv, bool bridged,
|
||
struct batadv_mcast_querier_state *querier_ipv4,
|
||
struct batadv_mcast_querier_state *querier_ipv6)
|
||
{
|
||
if (!bat_priv->mcast.bridged && bridged)
|
||
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
|
||
"Bridge added: Setting Unsnoopables(U)-flag\n");
|
||
else if (bat_priv->mcast.bridged && !bridged)
|
||
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
|
||
"Bridge removed: Unsetting Unsnoopables(U)-flag\n");
|
||
|
||
if (bridged) {
|
||
batadv_mcast_querier_log(bat_priv, "IGMP",
|
||
&bat_priv->mcast.querier_ipv4,
|
||
querier_ipv4);
|
||
batadv_mcast_querier_log(bat_priv, "MLD",
|
||
&bat_priv->mcast.querier_ipv6,
|
||
querier_ipv6);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_flags_logs() - output debug information about mcast flag changes
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
* @flags: flags indicating the new multicast state
|
||
*
|
||
* Whenever the multicast flags this nodes announces changes (@mcast_flags vs.
|
||
* bat_priv->mcast.flags), this notifies userspace via the 'mcast' log level.
|
||
*/
|
||
static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags)
|
||
{
|
||
u8 old_flags = bat_priv->mcast.flags;
|
||
char str_old_flags[] = "[...]";
|
||
|
||
sprintf(str_old_flags, "[%c%c%c]",
|
||
(old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
|
||
(old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
|
||
(old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.');
|
||
|
||
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
|
||
"Changing multicast flags from '%s' to '[%c%c%c]'\n",
|
||
bat_priv->mcast.enabled ? str_old_flags : "<undefined>",
|
||
(flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
|
||
(flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
|
||
(flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.');
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_mla_tvlv_update() - update multicast tvlv
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
*
|
||
* Updates the own multicast tvlv with our current multicast related settings,
|
||
* capabilities and inabilities.
|
||
*
|
||
* Return: false if we want all IPv4 && IPv6 multicast traffic and true
|
||
* otherwise.
|
||
*/
|
||
static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv)
|
||
{
|
||
struct batadv_tvlv_mcast_data mcast_data;
|
||
struct batadv_mcast_querier_state querier4 = {false, false};
|
||
struct batadv_mcast_querier_state querier6 = {false, false};
|
||
struct net_device *dev = bat_priv->soft_iface;
|
||
bool bridged;
|
||
|
||
mcast_data.flags = BATADV_NO_FLAGS;
|
||
memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved));
|
||
|
||
bridged = batadv_mcast_has_bridge(bat_priv);
|
||
if (!bridged)
|
||
goto update;
|
||
|
||
if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING))
|
||
pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n");
|
||
|
||
querier4.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP);
|
||
querier4.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP);
|
||
|
||
querier6.exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6);
|
||
querier6.shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6);
|
||
|
||
mcast_data.flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES;
|
||
|
||
/* 1) If no querier exists at all, then multicast listeners on
|
||
* our local TT clients behind the bridge will keep silent.
|
||
* 2) If the selected querier is on one of our local TT clients,
|
||
* behind the bridge, then this querier might shadow multicast
|
||
* listeners on our local TT clients, behind this bridge.
|
||
*
|
||
* In both cases, we will signalize other batman nodes that
|
||
* we need all multicast traffic of the according protocol.
|
||
*/
|
||
if (!querier4.exists || querier4.shadowing)
|
||
mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV4;
|
||
|
||
if (!querier6.exists || querier6.shadowing)
|
||
mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV6;
|
||
|
||
update:
|
||
batadv_mcast_bridge_log(bat_priv, bridged, &querier4, &querier6);
|
||
|
||
bat_priv->mcast.querier_ipv4.exists = querier4.exists;
|
||
bat_priv->mcast.querier_ipv4.shadowing = querier4.shadowing;
|
||
|
||
bat_priv->mcast.querier_ipv6.exists = querier6.exists;
|
||
bat_priv->mcast.querier_ipv6.shadowing = querier6.shadowing;
|
||
|
||
bat_priv->mcast.bridged = bridged;
|
||
|
||
if (!bat_priv->mcast.enabled ||
|
||
mcast_data.flags != bat_priv->mcast.flags) {
|
||
batadv_mcast_flags_log(bat_priv, mcast_data.flags);
|
||
batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2,
|
||
&mcast_data, sizeof(mcast_data));
|
||
bat_priv->mcast.flags = mcast_data.flags;
|
||
bat_priv->mcast.enabled = true;
|
||
}
|
||
|
||
return !(mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV4 &&
|
||
mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV6);
|
||
}
|
||
|
||
/**
|
||
* __batadv_mcast_mla_update() - update the own MLAs
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
*
|
||
* Updates the own multicast listener announcements in the translation
|
||
* table as well as the own, announced multicast tvlv container.
|
||
*
|
||
* Note that non-conflicting reads and writes to bat_priv->mcast.mla_list
|
||
* in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are
|
||
* ensured by the non-parallel execution of the worker this function
|
||
* belongs to.
|
||
*/
|
||
static 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;
|
||
|
||
if (!batadv_mcast_mla_tvlv_update(bat_priv))
|
||
goto update;
|
||
|
||
ret = batadv_mcast_mla_softif_get(bat_priv, soft_iface, &mcast_list);
|
||
if (ret < 0)
|
||
goto out;
|
||
|
||
ret = batadv_mcast_mla_bridge_get(bat_priv, 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_mla_update() - update the own MLAs
|
||
* @work: kernel work struct
|
||
*
|
||
* Updates the own multicast listener announcements in the translation
|
||
* table as well as the own, announced multicast tvlv container.
|
||
*
|
||
* In the end, reschedules the work timer.
|
||
*/
|
||
static void batadv_mcast_mla_update(struct work_struct *work)
|
||
{
|
||
struct delayed_work *delayed_work;
|
||
struct batadv_priv_mcast *priv_mcast;
|
||
struct batadv_priv *bat_priv;
|
||
|
||
delayed_work = to_delayed_work(work);
|
||
priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work);
|
||
bat_priv = container_of(priv_mcast, struct batadv_priv, mcast);
|
||
|
||
spin_lock(&bat_priv->mcast.mla_lock);
|
||
__batadv_mcast_mla_update(bat_priv);
|
||
spin_unlock(&bat_priv->mcast.mla_lock);
|
||
|
||
batadv_mcast_start_timer(bat_priv);
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_is_report_ipv4() - check for IGMP reports
|
||
* @skb: the ethernet frame destined for the mesh
|
||
*
|
||
* This call might reallocate skb data.
|
||
*
|
||
* Checks whether the given frame is a valid IGMP report.
|
||
*
|
||
* Return: If so then true, otherwise false.
|
||
*/
|
||
static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb)
|
||
{
|
||
if (ip_mc_check_igmp(skb, NULL) < 0)
|
||
return false;
|
||
|
||
switch (igmp_hdr(skb)->type) {
|
||
case IGMP_HOST_MEMBERSHIP_REPORT:
|
||
case IGMPV2_HOST_MEMBERSHIP_REPORT:
|
||
case IGMPV3_HOST_MEMBERSHIP_REPORT:
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding
|
||
* potential
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
* @skb: the IPv4 packet to check
|
||
* @is_unsnoopable: stores whether the destination is snoopable
|
||
*
|
||
* Checks whether the given IPv4 packet has the potential to be forwarded with a
|
||
* mode more optimal than classic flooding.
|
||
*
|
||
* Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory
|
||
* allocation failure.
|
||
*/
|
||
static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv,
|
||
struct sk_buff *skb,
|
||
bool *is_unsnoopable)
|
||
{
|
||
struct iphdr *iphdr;
|
||
|
||
/* We might fail due to out-of-memory -> drop it */
|
||
if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr)))
|
||
return -ENOMEM;
|
||
|
||
if (batadv_mcast_is_report_ipv4(skb))
|
||
return -EINVAL;
|
||
|
||
iphdr = ip_hdr(skb);
|
||
|
||
/* TODO: Implement Multicast Router Discovery (RFC4286),
|
||
* then allow scope > link local, too
|
||
*/
|
||
if (!ipv4_is_local_multicast(iphdr->daddr))
|
||
return -EINVAL;
|
||
|
||
/* link-local multicast listeners behind a bridge are
|
||
* not snoopable (see RFC4541, section 2.1.2.2)
|
||
*/
|
||
*is_unsnoopable = true;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_is_report_ipv6() - check for MLD reports
|
||
* @skb: the ethernet frame destined for the mesh
|
||
*
|
||
* This call might reallocate skb data.
|
||
*
|
||
* Checks whether the given frame is a valid MLD report.
|
||
*
|
||
* Return: If so then true, otherwise false.
|
||
*/
|
||
static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb)
|
||
{
|
||
if (ipv6_mc_check_mld(skb, NULL) < 0)
|
||
return false;
|
||
|
||
switch (icmp6_hdr(skb)->icmp6_type) {
|
||
case ICMPV6_MGM_REPORT:
|
||
case ICMPV6_MLD2_REPORT:
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding
|
||
* potential
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
* @skb: the IPv6 packet to check
|
||
* @is_unsnoopable: stores whether the destination is snoopable
|
||
*
|
||
* Checks whether the given IPv6 packet has the potential to be forwarded with a
|
||
* mode more optimal than classic flooding.
|
||
*
|
||
* Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
|
||
*/
|
||
static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv,
|
||
struct sk_buff *skb,
|
||
bool *is_unsnoopable)
|
||
{
|
||
struct ipv6hdr *ip6hdr;
|
||
|
||
/* We might fail due to out-of-memory -> drop it */
|
||
if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr)))
|
||
return -ENOMEM;
|
||
|
||
if (batadv_mcast_is_report_ipv6(skb))
|
||
return -EINVAL;
|
||
|
||
ip6hdr = ipv6_hdr(skb);
|
||
|
||
/* TODO: Implement Multicast Router Discovery (RFC4286),
|
||
* then allow scope > link local, too
|
||
*/
|
||
if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL)
|
||
return -EINVAL;
|
||
|
||
/* link-local-all-nodes multicast listeners behind a bridge are
|
||
* not snoopable (see RFC4541, section 3, paragraph 3)
|
||
*/
|
||
if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr))
|
||
*is_unsnoopable = true;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_forw_mode_check() - check for optimized forwarding potential
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
* @skb: the multicast frame to check
|
||
* @is_unsnoopable: stores whether the destination is snoopable
|
||
*
|
||
* Checks whether the given multicast ethernet frame has the potential to be
|
||
* forwarded with a mode more optimal than classic flooding.
|
||
*
|
||
* Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory
|
||
*/
|
||
static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv,
|
||
struct sk_buff *skb,
|
||
bool *is_unsnoopable)
|
||
{
|
||
struct ethhdr *ethhdr = eth_hdr(skb);
|
||
|
||
if (!atomic_read(&bat_priv->multicast_mode))
|
||
return -EINVAL;
|
||
|
||
switch (ntohs(ethhdr->h_proto)) {
|
||
case ETH_P_IP:
|
||
return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb,
|
||
is_unsnoopable);
|
||
case ETH_P_IPV6:
|
||
if (!IS_ENABLED(CONFIG_IPV6))
|
||
return -EINVAL;
|
||
|
||
return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb,
|
||
is_unsnoopable);
|
||
default:
|
||
return -EINVAL;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast
|
||
* interest
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
* @ethhdr: ethernet header of a packet
|
||
*
|
||
* Return: the number of nodes which want all IPv4 multicast traffic if the
|
||
* given ethhdr is from an IPv4 packet or the number of nodes which want all
|
||
* IPv6 traffic if it matches an IPv6 packet.
|
||
*/
|
||
static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv,
|
||
struct ethhdr *ethhdr)
|
||
{
|
||
switch (ntohs(ethhdr->h_proto)) {
|
||
case ETH_P_IP:
|
||
return atomic_read(&bat_priv->mcast.num_want_all_ipv4);
|
||
case ETH_P_IPV6:
|
||
return atomic_read(&bat_priv->mcast.num_want_all_ipv6);
|
||
default:
|
||
/* we shouldn't be here... */
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_forw_tt_node_get() - get a multicast tt node
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
* @ethhdr: the ether header containing the multicast destination
|
||
*
|
||
* Return: an orig_node matching the multicast address provided by ethhdr
|
||
* via a translation table lookup. This increases the returned nodes refcount.
|
||
*/
|
||
static struct batadv_orig_node *
|
||
batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv,
|
||
struct ethhdr *ethhdr)
|
||
{
|
||
return batadv_transtable_search(bat_priv, NULL, ethhdr->h_dest,
|
||
BATADV_NO_FLAGS);
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_forw_ipv4_node_get() - get a node with an ipv4 flag
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
*
|
||
* Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and
|
||
* increases its refcount.
|
||
*/
|
||
static struct batadv_orig_node *
|
||
batadv_mcast_forw_ipv4_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_ipv4_list,
|
||
mcast_want_all_ipv4_node) {
|
||
if (!kref_get_unless_zero(&tmp_orig_node->refcount))
|
||
continue;
|
||
|
||
orig_node = tmp_orig_node;
|
||
break;
|
||
}
|
||
rcu_read_unlock();
|
||
|
||
return orig_node;
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_forw_ipv6_node_get() - get a node with an ipv6 flag
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
*
|
||
* Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set
|
||
* and increases its refcount.
|
||
*/
|
||
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 (!kref_get_unless_zero(&tmp_orig_node->refcount))
|
||
continue;
|
||
|
||
orig_node = tmp_orig_node;
|
||
break;
|
||
}
|
||
rcu_read_unlock();
|
||
|
||
return orig_node;
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_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
|
||
*
|
||
* Return: 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_forw_unsnoop_node_get() - get a node with an unsnoopable flag
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
*
|
||
* Return: 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 (!kref_get_unless_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
|
||
*
|
||
* Return: 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() - 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(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;
|
||
|
||
if (orig_mcast_enabled && tvlv_value &&
|
||
tvlv_value_len >= sizeof(mcast_flags))
|
||
mcast_flags = *(u8 *)tvlv_value;
|
||
|
||
if (!orig_mcast_enabled) {
|
||
mcast_flags |= BATADV_MCAST_WANT_ALL_IPV4;
|
||
mcast_flags |= BATADV_MCAST_WANT_ALL_IPV6;
|
||
}
|
||
|
||
spin_lock_bh(&orig->mcast_handler_lock);
|
||
|
||
if (orig_mcast_enabled &&
|
||
!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
|
||
set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
|
||
} else if (!orig_mcast_enabled &&
|
||
test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
|
||
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,
|
||
NULL, BATADV_TVLV_MCAST, 2,
|
||
BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
|
||
|
||
INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update);
|
||
batadv_mcast_start_timer(bat_priv);
|
||
}
|
||
|
||
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
|
||
/**
|
||
* batadv_mcast_flags_print_header() - print own mcast flags to debugfs table
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
* @seq: debugfs table seq_file struct
|
||
*
|
||
* Prints our own multicast flags including a more specific reason why
|
||
* they are set, that is prints the bridge and querier state too, to
|
||
* the debugfs table specified via @seq.
|
||
*/
|
||
static void batadv_mcast_flags_print_header(struct batadv_priv *bat_priv,
|
||
struct seq_file *seq)
|
||
{
|
||
u8 flags = bat_priv->mcast.flags;
|
||
char querier4, querier6, shadowing4, shadowing6;
|
||
bool bridged = bat_priv->mcast.bridged;
|
||
|
||
if (bridged) {
|
||
querier4 = bat_priv->mcast.querier_ipv4.exists ? '.' : '4';
|
||
querier6 = bat_priv->mcast.querier_ipv6.exists ? '.' : '6';
|
||
shadowing4 = bat_priv->mcast.querier_ipv4.shadowing ? '4' : '.';
|
||
shadowing6 = bat_priv->mcast.querier_ipv6.shadowing ? '6' : '.';
|
||
} else {
|
||
querier4 = '?';
|
||
querier6 = '?';
|
||
shadowing4 = '?';
|
||
shadowing6 = '?';
|
||
}
|
||
|
||
seq_printf(seq, "Multicast flags (own flags: [%c%c%c])\n",
|
||
(flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
|
||
(flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
|
||
(flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.');
|
||
seq_printf(seq, "* Bridged [U]\t\t\t\t%c\n", bridged ? 'U' : '.');
|
||
seq_printf(seq, "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n",
|
||
querier4, querier6);
|
||
seq_printf(seq, "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n",
|
||
shadowing4, shadowing6);
|
||
seq_puts(seq, "-------------------------------------------\n");
|
||
seq_printf(seq, " %-10s %s\n", "Originator", "Flags");
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_flags_seq_print_text() - print the mcast flags of other nodes
|
||
* @seq: seq file to print on
|
||
* @offset: not used
|
||
*
|
||
* This prints a table of (primary) originators and their according
|
||
* multicast flags, including (in the header) our own.
|
||
*
|
||
* Return: always 0
|
||
*/
|
||
int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset)
|
||
{
|
||
struct net_device *net_dev = (struct net_device *)seq->private;
|
||
struct batadv_priv *bat_priv = netdev_priv(net_dev);
|
||
struct batadv_hard_iface *primary_if;
|
||
struct batadv_hashtable *hash = bat_priv->orig_hash;
|
||
struct batadv_orig_node *orig_node;
|
||
struct hlist_head *head;
|
||
u8 flags;
|
||
u32 i;
|
||
|
||
primary_if = batadv_seq_print_text_primary_if_get(seq);
|
||
if (!primary_if)
|
||
return 0;
|
||
|
||
batadv_mcast_flags_print_header(bat_priv, seq);
|
||
|
||
for (i = 0; i < hash->size; i++) {
|
||
head = &hash->table[i];
|
||
|
||
rcu_read_lock();
|
||
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
|
||
if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
|
||
&orig_node->capa_initialized))
|
||
continue;
|
||
|
||
if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
|
||
&orig_node->capabilities)) {
|
||
seq_printf(seq, "%pM -\n", orig_node->orig);
|
||
continue;
|
||
}
|
||
|
||
flags = orig_node->mcast_flags;
|
||
|
||
seq_printf(seq, "%pM [%c%c%c]\n", orig_node->orig,
|
||
(flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)
|
||
? 'U' : '.',
|
||
(flags & BATADV_MCAST_WANT_ALL_IPV4)
|
||
? '4' : '.',
|
||
(flags & BATADV_MCAST_WANT_ALL_IPV6)
|
||
? '6' : '.');
|
||
}
|
||
rcu_read_unlock();
|
||
}
|
||
|
||
batadv_hardif_put(primary_if);
|
||
|
||
return 0;
|
||
}
|
||
#endif
|
||
|
||
/**
|
||
* batadv_mcast_mesh_info_put() - put multicast info into a netlink message
|
||
* @msg: buffer for the message
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
*
|
||
* Return: 0 or error code.
|
||
*/
|
||
int batadv_mcast_mesh_info_put(struct sk_buff *msg,
|
||
struct batadv_priv *bat_priv)
|
||
{
|
||
u32 flags = bat_priv->mcast.flags;
|
||
u32 flags_priv = BATADV_NO_FLAGS;
|
||
|
||
if (bat_priv->mcast.bridged) {
|
||
flags_priv |= BATADV_MCAST_FLAGS_BRIDGED;
|
||
|
||
if (bat_priv->mcast.querier_ipv4.exists)
|
||
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS;
|
||
if (bat_priv->mcast.querier_ipv6.exists)
|
||
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS;
|
||
if (bat_priv->mcast.querier_ipv4.shadowing)
|
||
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING;
|
||
if (bat_priv->mcast.querier_ipv6.shadowing)
|
||
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING;
|
||
}
|
||
|
||
if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) ||
|
||
nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv))
|
||
return -EMSGSIZE;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table
|
||
* to a netlink socket
|
||
* @msg: buffer for the message
|
||
* @portid: netlink port
|
||
* @seq: Sequence number of netlink message
|
||
* @orig_node: originator to dump the multicast flags of
|
||
*
|
||
* Return: 0 or error code.
|
||
*/
|
||
static int
|
||
batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
|
||
struct batadv_orig_node *orig_node)
|
||
{
|
||
void *hdr;
|
||
|
||
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
|
||
NLM_F_MULTI, BATADV_CMD_GET_MCAST_FLAGS);
|
||
if (!hdr)
|
||
return -ENOBUFS;
|
||
|
||
if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
|
||
orig_node->orig)) {
|
||
genlmsg_cancel(msg, hdr);
|
||
return -EMSGSIZE;
|
||
}
|
||
|
||
if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
|
||
&orig_node->capabilities)) {
|
||
if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS,
|
||
orig_node->mcast_flags)) {
|
||
genlmsg_cancel(msg, hdr);
|
||
return -EMSGSIZE;
|
||
}
|
||
}
|
||
|
||
genlmsg_end(msg, hdr);
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags
|
||
* table to a netlink socket
|
||
* @msg: buffer for the message
|
||
* @portid: netlink port
|
||
* @seq: Sequence number of netlink message
|
||
* @head: bucket to dump
|
||
* @idx_skip: How many entries to skip
|
||
*
|
||
* Return: 0 or error code.
|
||
*/
|
||
static int
|
||
batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
|
||
struct hlist_head *head, long *idx_skip)
|
||
{
|
||
struct batadv_orig_node *orig_node;
|
||
long idx = 0;
|
||
|
||
rcu_read_lock();
|
||
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
|
||
if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
|
||
&orig_node->capa_initialized))
|
||
continue;
|
||
|
||
if (idx < *idx_skip)
|
||
goto skip;
|
||
|
||
if (batadv_mcast_flags_dump_entry(msg, portid, seq,
|
||
orig_node)) {
|
||
rcu_read_unlock();
|
||
*idx_skip = idx;
|
||
|
||
return -EMSGSIZE;
|
||
}
|
||
|
||
skip:
|
||
idx++;
|
||
}
|
||
rcu_read_unlock();
|
||
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
|
||
* @msg: buffer for the message
|
||
* @portid: netlink port
|
||
* @seq: Sequence number of netlink message
|
||
* @bat_priv: the bat priv with all the soft interface information
|
||
* @bucket: current bucket to dump
|
||
* @idx: index in current bucket to the next entry to dump
|
||
*
|
||
* Return: 0 or error code.
|
||
*/
|
||
static int
|
||
__batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid, u32 seq,
|
||
struct batadv_priv *bat_priv, long *bucket, long *idx)
|
||
{
|
||
struct batadv_hashtable *hash = bat_priv->orig_hash;
|
||
long bucket_tmp = *bucket;
|
||
struct hlist_head *head;
|
||
long idx_tmp = *idx;
|
||
|
||
while (bucket_tmp < hash->size) {
|
||
head = &hash->table[bucket_tmp];
|
||
|
||
if (batadv_mcast_flags_dump_bucket(msg, portid, seq, head,
|
||
&idx_tmp))
|
||
break;
|
||
|
||
bucket_tmp++;
|
||
idx_tmp = 0;
|
||
}
|
||
|
||
*bucket = bucket_tmp;
|
||
*idx = idx_tmp;
|
||
|
||
return msg->len;
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_netlink_get_primary() - get primary interface from netlink
|
||
* callback
|
||
* @cb: netlink callback structure
|
||
* @primary_if: the primary interface pointer to return the result in
|
||
*
|
||
* Return: 0 or error code.
|
||
*/
|
||
static int
|
||
batadv_mcast_netlink_get_primary(struct netlink_callback *cb,
|
||
struct batadv_hard_iface **primary_if)
|
||
{
|
||
struct batadv_hard_iface *hard_iface = NULL;
|
||
struct net *net = sock_net(cb->skb->sk);
|
||
struct net_device *soft_iface;
|
||
struct batadv_priv *bat_priv;
|
||
int ifindex;
|
||
int ret = 0;
|
||
|
||
ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
|
||
if (!ifindex)
|
||
return -EINVAL;
|
||
|
||
soft_iface = dev_get_by_index(net, ifindex);
|
||
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
|
||
ret = -ENODEV;
|
||
goto out;
|
||
}
|
||
|
||
bat_priv = netdev_priv(soft_iface);
|
||
|
||
hard_iface = batadv_primary_if_get_selected(bat_priv);
|
||
if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) {
|
||
ret = -ENOENT;
|
||
goto out;
|
||
}
|
||
|
||
out:
|
||
if (soft_iface)
|
||
dev_put(soft_iface);
|
||
|
||
if (!ret && primary_if)
|
||
*primary_if = hard_iface;
|
||
else if (hard_iface)
|
||
batadv_hardif_put(hard_iface);
|
||
|
||
return ret;
|
||
}
|
||
|
||
/**
|
||
* batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
|
||
* @msg: buffer for the message
|
||
* @cb: callback structure containing arguments
|
||
*
|
||
* Return: message length.
|
||
*/
|
||
int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb)
|
||
{
|
||
struct batadv_hard_iface *primary_if = NULL;
|
||
int portid = NETLINK_CB(cb->skb).portid;
|
||
struct batadv_priv *bat_priv;
|
||
long *bucket = &cb->args[0];
|
||
long *idx = &cb->args[1];
|
||
int ret;
|
||
|
||
ret = batadv_mcast_netlink_get_primary(cb, &primary_if);
|
||
if (ret)
|
||
return ret;
|
||
|
||
bat_priv = netdev_priv(primary_if->soft_iface);
|
||
ret = __batadv_mcast_flags_dump(msg, portid, cb->nlh->nlmsg_seq,
|
||
bat_priv, bucket, idx);
|
||
|
||
batadv_hardif_put(primary_if);
|
||
return ret;
|
||
}
|
||
|
||
/**
|
||
* 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)
|
||
{
|
||
cancel_delayed_work_sync(&bat_priv->mcast.work);
|
||
|
||
batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
|
||
batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
|
||
|
||
/* safely calling outside of worker, as worker was canceled above */
|
||
batadv_mcast_mla_tt_retract(bat_priv, NULL);
|
||
}
|
||
|
||
/**
|
||
* 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);
|
||
|
||
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);
|
||
}
|