mirror of https://gitee.com/openkylin/linux.git
695 lines
19 KiB
C
695 lines
19 KiB
C
/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "main.h"
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#include "distributed-arp-table.h"
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#include "hard-interface.h"
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#include "soft-interface.h"
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#include "send.h"
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#include "translation-table.h"
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#include "routing.h"
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#include "sysfs.h"
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#include "originator.h"
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#include "hash.h"
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#include "bridge_loop_avoidance.h"
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#include "gateway_client.h"
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#include <linux/if_arp.h>
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#include <linux/if_ether.h>
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void batadv_hardif_free_rcu(struct rcu_head *rcu)
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{
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struct batadv_hard_iface *hard_iface;
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hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
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dev_put(hard_iface->net_dev);
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kfree(hard_iface);
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}
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struct batadv_hard_iface *
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batadv_hardif_get_by_netdev(const struct net_device *net_dev)
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{
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struct batadv_hard_iface *hard_iface;
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rcu_read_lock();
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list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
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if (hard_iface->net_dev == net_dev &&
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atomic_inc_not_zero(&hard_iface->refcount))
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goto out;
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}
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hard_iface = NULL;
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out:
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rcu_read_unlock();
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return hard_iface;
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}
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/**
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* batadv_is_on_batman_iface - check if a device is a batman iface descendant
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* @net_dev: the device to check
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*
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* If the user creates any virtual device on top of a batman-adv interface, it
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* is important to prevent this new interface to be used to create a new mesh
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* network (this behaviour would lead to a batman-over-batman configuration).
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* This function recursively checks all the fathers of the device passed as
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* argument looking for a batman-adv soft interface.
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*
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* Returns true if the device is descendant of a batman-adv mesh interface (or
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* if it is a batman-adv interface itself), false otherwise
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*/
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static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
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{
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struct net_device *parent_dev;
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bool ret;
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/* check if this is a batman-adv mesh interface */
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if (batadv_softif_is_valid(net_dev))
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return true;
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/* no more parents..stop recursion */
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if (net_dev->iflink == net_dev->ifindex)
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return false;
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/* recurse over the parent device */
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parent_dev = dev_get_by_index(&init_net, net_dev->iflink);
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/* if we got a NULL parent_dev there is something broken.. */
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if (WARN(!parent_dev, "Cannot find parent device"))
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return false;
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ret = batadv_is_on_batman_iface(parent_dev);
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if (parent_dev)
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dev_put(parent_dev);
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return ret;
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}
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static int batadv_is_valid_iface(const struct net_device *net_dev)
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{
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if (net_dev->flags & IFF_LOOPBACK)
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return 0;
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if (net_dev->type != ARPHRD_ETHER)
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return 0;
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if (net_dev->addr_len != ETH_ALEN)
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return 0;
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/* no batman over batman */
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if (batadv_is_on_batman_iface(net_dev))
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return 0;
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return 1;
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}
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/**
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* batadv_is_wifi_netdev - check if the given net_device struct is a wifi
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* interface
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* @net_device: the device to check
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*
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* Returns true if the net device is a 802.11 wireless device, false otherwise.
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*/
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bool batadv_is_wifi_netdev(struct net_device *net_device)
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{
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if (!net_device)
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return false;
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#ifdef CONFIG_WIRELESS_EXT
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/* pre-cfg80211 drivers have to implement WEXT, so it is possible to
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* check for wireless_handlers != NULL
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*/
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if (net_device->wireless_handlers)
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return true;
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#endif
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/* cfg80211 drivers have to set ieee80211_ptr */
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if (net_device->ieee80211_ptr)
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return true;
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return false;
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}
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static struct batadv_hard_iface *
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batadv_hardif_get_active(const struct net_device *soft_iface)
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{
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struct batadv_hard_iface *hard_iface;
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rcu_read_lock();
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list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
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if (hard_iface->soft_iface != soft_iface)
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continue;
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if (hard_iface->if_status == BATADV_IF_ACTIVE &&
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atomic_inc_not_zero(&hard_iface->refcount))
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goto out;
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}
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hard_iface = NULL;
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out:
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rcu_read_unlock();
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return hard_iface;
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}
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static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
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struct batadv_hard_iface *oldif)
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{
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struct batadv_hard_iface *primary_if;
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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goto out;
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batadv_dat_init_own_addr(bat_priv, primary_if);
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batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
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out:
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if (primary_if)
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batadv_hardif_free_ref(primary_if);
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}
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static void batadv_primary_if_select(struct batadv_priv *bat_priv,
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struct batadv_hard_iface *new_hard_iface)
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{
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struct batadv_hard_iface *curr_hard_iface;
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ASSERT_RTNL();
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if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
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new_hard_iface = NULL;
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curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
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rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
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if (!new_hard_iface)
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goto out;
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bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
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batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
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out:
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if (curr_hard_iface)
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batadv_hardif_free_ref(curr_hard_iface);
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}
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static bool
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batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
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{
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if (hard_iface->net_dev->flags & IFF_UP)
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return true;
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return false;
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}
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static void batadv_check_known_mac_addr(const struct net_device *net_dev)
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{
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const struct batadv_hard_iface *hard_iface;
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rcu_read_lock();
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list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
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if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
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(hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
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continue;
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if (hard_iface->net_dev == net_dev)
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continue;
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if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
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net_dev->dev_addr))
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continue;
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pr_warn("The newly added mac address (%pM) already exists on: %s\n",
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net_dev->dev_addr, hard_iface->net_dev->name);
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pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
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}
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rcu_read_unlock();
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}
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int batadv_hardif_min_mtu(struct net_device *soft_iface)
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{
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struct batadv_priv *bat_priv = netdev_priv(soft_iface);
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const struct batadv_hard_iface *hard_iface;
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int min_mtu = ETH_DATA_LEN;
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rcu_read_lock();
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list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
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if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
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(hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
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continue;
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if (hard_iface->soft_iface != soft_iface)
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continue;
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min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
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}
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rcu_read_unlock();
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atomic_set(&bat_priv->packet_size_max, min_mtu);
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if (atomic_read(&bat_priv->fragmentation) == 0)
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goto out;
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/* with fragmentation enabled the maximum size of internally generated
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* packets such as translation table exchanges or tvlv containers, etc
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* has to be calculated
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*/
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min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
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min_mtu -= sizeof(struct batadv_frag_packet);
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min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
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atomic_set(&bat_priv->packet_size_max, min_mtu);
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/* with fragmentation enabled we can fragment external packets easily */
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min_mtu = min_t(int, min_mtu, ETH_DATA_LEN);
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out:
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return min_mtu - batadv_max_header_len();
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}
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/* adjusts the MTU if a new interface with a smaller MTU appeared. */
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void batadv_update_min_mtu(struct net_device *soft_iface)
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{
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soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
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/* Check if the local translate table should be cleaned up to match a
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* new (and smaller) MTU.
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*/
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batadv_tt_local_resize_to_mtu(soft_iface);
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}
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static void
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batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
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{
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struct batadv_priv *bat_priv;
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struct batadv_hard_iface *primary_if = NULL;
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if (hard_iface->if_status != BATADV_IF_INACTIVE)
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goto out;
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bat_priv = netdev_priv(hard_iface->soft_iface);
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bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
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hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
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/* the first active interface becomes our primary interface or
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* the next active interface after the old primary interface was removed
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*/
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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batadv_primary_if_select(bat_priv, hard_iface);
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batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
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hard_iface->net_dev->name);
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batadv_update_min_mtu(hard_iface->soft_iface);
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out:
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if (primary_if)
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batadv_hardif_free_ref(primary_if);
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}
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static void
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batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
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{
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if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
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(hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
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return;
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hard_iface->if_status = BATADV_IF_INACTIVE;
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batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
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hard_iface->net_dev->name);
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batadv_update_min_mtu(hard_iface->soft_iface);
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}
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/**
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* batadv_master_del_slave - remove hard_iface from the current master interface
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* @slave: the interface enslaved in another master
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* @master: the master from which slave has to be removed
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*
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* Invoke ndo_del_slave on master passing slave as argument. In this way slave
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* is free'd and master can correctly change its internal state.
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* Return 0 on success, a negative value representing the error otherwise
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*/
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static int batadv_master_del_slave(struct batadv_hard_iface *slave,
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struct net_device *master)
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{
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int ret;
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if (!master)
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return 0;
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ret = -EBUSY;
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if (master->netdev_ops->ndo_del_slave)
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ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
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return ret;
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}
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int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
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const char *iface_name)
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{
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struct batadv_priv *bat_priv;
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struct net_device *soft_iface, *master;
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__be16 ethertype = htons(ETH_P_BATMAN);
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int max_header_len = batadv_max_header_len();
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int ret;
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if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
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goto out;
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if (!atomic_inc_not_zero(&hard_iface->refcount))
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goto out;
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soft_iface = dev_get_by_name(&init_net, iface_name);
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if (!soft_iface) {
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soft_iface = batadv_softif_create(iface_name);
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if (!soft_iface) {
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ret = -ENOMEM;
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goto err;
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}
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/* dev_get_by_name() increases the reference counter for us */
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dev_hold(soft_iface);
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}
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if (!batadv_softif_is_valid(soft_iface)) {
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pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
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soft_iface->name);
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ret = -EINVAL;
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goto err_dev;
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}
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/* check if the interface is enslaved in another virtual one and
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* in that case unlink it first
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*/
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master = netdev_master_upper_dev_get(hard_iface->net_dev);
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ret = batadv_master_del_slave(hard_iface, master);
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if (ret)
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goto err_dev;
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hard_iface->soft_iface = soft_iface;
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bat_priv = netdev_priv(hard_iface->soft_iface);
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ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
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if (ret)
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goto err_dev;
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ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
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if (ret < 0)
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goto err_upper;
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hard_iface->if_num = bat_priv->num_ifaces;
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bat_priv->num_ifaces++;
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hard_iface->if_status = BATADV_IF_INACTIVE;
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ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
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if (ret < 0) {
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bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
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bat_priv->num_ifaces--;
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hard_iface->if_status = BATADV_IF_NOT_IN_USE;
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goto err_upper;
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}
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hard_iface->batman_adv_ptype.type = ethertype;
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hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
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hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
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dev_add_pack(&hard_iface->batman_adv_ptype);
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batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
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hard_iface->net_dev->name);
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if (atomic_read(&bat_priv->fragmentation) &&
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hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
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batadv_info(hard_iface->soft_iface,
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"The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %i would solve the problem.\n",
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hard_iface->net_dev->name, hard_iface->net_dev->mtu,
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ETH_DATA_LEN + max_header_len);
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if (!atomic_read(&bat_priv->fragmentation) &&
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hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
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batadv_info(hard_iface->soft_iface,
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"The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %i.\n",
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hard_iface->net_dev->name, hard_iface->net_dev->mtu,
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ETH_DATA_LEN + max_header_len);
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if (batadv_hardif_is_iface_up(hard_iface))
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batadv_hardif_activate_interface(hard_iface);
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else
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batadv_err(hard_iface->soft_iface,
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"Not using interface %s (retrying later): interface not active\n",
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hard_iface->net_dev->name);
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/* begin scheduling originator messages on that interface */
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batadv_schedule_bat_ogm(hard_iface);
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out:
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return 0;
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err_upper:
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netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
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err_dev:
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hard_iface->soft_iface = NULL;
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dev_put(soft_iface);
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err:
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batadv_hardif_free_ref(hard_iface);
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return ret;
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}
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void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
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enum batadv_hard_if_cleanup autodel)
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{
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struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
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struct batadv_hard_iface *primary_if = NULL;
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if (hard_iface->if_status == BATADV_IF_ACTIVE)
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batadv_hardif_deactivate_interface(hard_iface);
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if (hard_iface->if_status != BATADV_IF_INACTIVE)
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goto out;
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batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
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hard_iface->net_dev->name);
|
|
dev_remove_pack(&hard_iface->batman_adv_ptype);
|
|
|
|
bat_priv->num_ifaces--;
|
|
batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (hard_iface == primary_if) {
|
|
struct batadv_hard_iface *new_if;
|
|
|
|
new_if = batadv_hardif_get_active(hard_iface->soft_iface);
|
|
batadv_primary_if_select(bat_priv, new_if);
|
|
|
|
if (new_if)
|
|
batadv_hardif_free_ref(new_if);
|
|
}
|
|
|
|
bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
|
|
hard_iface->if_status = BATADV_IF_NOT_IN_USE;
|
|
|
|
/* delete all references to this hard_iface */
|
|
batadv_purge_orig_ref(bat_priv);
|
|
batadv_purge_outstanding_packets(bat_priv, hard_iface);
|
|
dev_put(hard_iface->soft_iface);
|
|
|
|
/* nobody uses this interface anymore */
|
|
if (!bat_priv->num_ifaces) {
|
|
batadv_gw_check_client_stop(bat_priv);
|
|
|
|
if (autodel == BATADV_IF_CLEANUP_AUTO)
|
|
batadv_softif_destroy_sysfs(hard_iface->soft_iface);
|
|
}
|
|
|
|
netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
|
|
hard_iface->soft_iface = NULL;
|
|
batadv_hardif_free_ref(hard_iface);
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
}
|
|
|
|
/**
|
|
* batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
|
|
* @work: work queue item
|
|
*
|
|
* Free the parts of the hard interface which can not be removed under
|
|
* rtnl lock (to prevent deadlock situations).
|
|
*/
|
|
static void batadv_hardif_remove_interface_finish(struct work_struct *work)
|
|
{
|
|
struct batadv_hard_iface *hard_iface;
|
|
|
|
hard_iface = container_of(work, struct batadv_hard_iface,
|
|
cleanup_work);
|
|
|
|
batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
|
|
batadv_hardif_free_ref(hard_iface);
|
|
}
|
|
|
|
static struct batadv_hard_iface *
|
|
batadv_hardif_add_interface(struct net_device *net_dev)
|
|
{
|
|
struct batadv_hard_iface *hard_iface;
|
|
int ret;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
ret = batadv_is_valid_iface(net_dev);
|
|
if (ret != 1)
|
|
goto out;
|
|
|
|
dev_hold(net_dev);
|
|
|
|
hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
|
|
if (!hard_iface)
|
|
goto release_dev;
|
|
|
|
ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
|
|
if (ret)
|
|
goto free_if;
|
|
|
|
hard_iface->if_num = -1;
|
|
hard_iface->net_dev = net_dev;
|
|
hard_iface->soft_iface = NULL;
|
|
hard_iface->if_status = BATADV_IF_NOT_IN_USE;
|
|
INIT_LIST_HEAD(&hard_iface->list);
|
|
INIT_WORK(&hard_iface->cleanup_work,
|
|
batadv_hardif_remove_interface_finish);
|
|
|
|
hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
|
|
if (batadv_is_wifi_netdev(net_dev))
|
|
hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
|
|
|
|
/* extra reference for return */
|
|
atomic_set(&hard_iface->refcount, 2);
|
|
|
|
batadv_check_known_mac_addr(hard_iface->net_dev);
|
|
list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
|
|
|
|
return hard_iface;
|
|
|
|
free_if:
|
|
kfree(hard_iface);
|
|
release_dev:
|
|
dev_put(net_dev);
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
/* first deactivate interface */
|
|
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
|
|
batadv_hardif_disable_interface(hard_iface,
|
|
BATADV_IF_CLEANUP_AUTO);
|
|
|
|
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
|
|
return;
|
|
|
|
hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
|
|
queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
|
|
}
|
|
|
|
void batadv_hardif_remove_interfaces(void)
|
|
{
|
|
struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
|
|
|
|
rtnl_lock();
|
|
list_for_each_entry_safe(hard_iface, hard_iface_tmp,
|
|
&batadv_hardif_list, list) {
|
|
list_del_rcu(&hard_iface->list);
|
|
batadv_hardif_remove_interface(hard_iface);
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static int batadv_hard_if_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
|
|
struct batadv_hard_iface *hard_iface;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
struct batadv_priv *bat_priv;
|
|
|
|
if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
|
|
batadv_sysfs_add_meshif(net_dev);
|
|
bat_priv = netdev_priv(net_dev);
|
|
batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
hard_iface = batadv_hardif_get_by_netdev(net_dev);
|
|
if (!hard_iface && event == NETDEV_REGISTER)
|
|
hard_iface = batadv_hardif_add_interface(net_dev);
|
|
|
|
if (!hard_iface)
|
|
goto out;
|
|
|
|
switch (event) {
|
|
case NETDEV_UP:
|
|
batadv_hardif_activate_interface(hard_iface);
|
|
break;
|
|
case NETDEV_GOING_DOWN:
|
|
case NETDEV_DOWN:
|
|
batadv_hardif_deactivate_interface(hard_iface);
|
|
break;
|
|
case NETDEV_UNREGISTER:
|
|
list_del_rcu(&hard_iface->list);
|
|
|
|
batadv_hardif_remove_interface(hard_iface);
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
if (hard_iface->soft_iface)
|
|
batadv_update_min_mtu(hard_iface->soft_iface);
|
|
break;
|
|
case NETDEV_CHANGEADDR:
|
|
if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
|
|
goto hardif_put;
|
|
|
|
batadv_check_known_mac_addr(hard_iface->net_dev);
|
|
|
|
bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto hardif_put;
|
|
|
|
if (hard_iface == primary_if)
|
|
batadv_primary_if_update_addr(bat_priv, NULL);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
hardif_put:
|
|
batadv_hardif_free_ref(hard_iface);
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
struct notifier_block batadv_hard_if_notifier = {
|
|
.notifier_call = batadv_hard_if_event,
|
|
};
|