From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/net/batman-adv/hard-interface.c | 149 +++++++++++++++++++++++++------------------------
1 files changed, 77 insertions(+), 72 deletions(-)
diff --git a/kernel/net/batman-adv/hard-interface.c b/kernel/net/batman-adv/hard-interface.c
index fc732b7..fe79bfc 100644
--- a/kernel/net/batman-adv/hard-interface.c
+++ b/kernel/net/batman-adv/hard-interface.c
@@ -1,19 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
-/* Copyright (C) 2007-2018 B.A.T.M.A.N. contributors:
+/* Copyright (C) 2007-2020 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "hard-interface.h"
@@ -28,6 +16,7 @@
#include <linux/if_ether.h>
#include <linux/kernel.h>
#include <linux/kref.h>
+#include <linux/limits.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
@@ -149,10 +138,10 @@
* @net_dev: the device to check
*
* If the user creates any virtual device on top of a batman-adv interface, it
- * is important to prevent this new interface to be used to create a new mesh
- * network (this behaviour would lead to a batman-over-batman configuration).
- * This function recursively checks all the fathers of the device passed as
- * argument looking for a batman-adv soft interface.
+ * is important to prevent this new interface from being used to create a new
+ * mesh network (this behaviour would lead to a batman-over-batman
+ * configuration). This function recursively checks all the fathers of the
+ * device passed as argument looking for a batman-adv soft interface.
*
* Return: true if the device is descendant of a batman-adv mesh interface (or
* if it is a batman-adv interface itself), false otherwise
@@ -162,22 +151,25 @@
struct net *net = dev_net(net_dev);
struct net_device *parent_dev;
struct net *parent_net;
+ int iflink;
bool ret;
/* check if this is a batman-adv mesh interface */
if (batadv_softif_is_valid(net_dev))
return true;
- /* no more parents..stop recursion */
- if (dev_get_iflink(net_dev) == 0 ||
- dev_get_iflink(net_dev) == net_dev->ifindex)
+ iflink = dev_get_iflink(net_dev);
+ if (iflink == 0)
return false;
parent_net = batadv_getlink_net(net_dev, net);
+ /* iflink to itself, most likely physical device */
+ if (net == parent_net && iflink == net_dev->ifindex)
+ return false;
+
/* recurse over the parent device */
- parent_dev = __dev_get_by_index((struct net *)parent_net,
- dev_get_iflink(net_dev));
+ parent_dev = __dev_get_by_index((struct net *)parent_net, iflink);
/* if we got a NULL parent_dev there is something broken.. */
if (!parent_dev) {
pr_err("Cannot find parent device\n");
@@ -227,14 +219,15 @@
struct net_device *real_netdev = NULL;
struct net *real_net;
struct net *net;
- int ifindex;
+ int iflink;
ASSERT_RTNL();
if (!netdev)
return NULL;
- if (netdev->ifindex == dev_get_iflink(netdev)) {
+ iflink = dev_get_iflink(netdev);
+ if (iflink == 0) {
dev_hold(netdev);
return netdev;
}
@@ -244,9 +237,16 @@
goto out;
net = dev_net(hard_iface->soft_iface);
- ifindex = dev_get_iflink(netdev);
real_net = batadv_getlink_net(netdev, net);
- real_netdev = dev_get_by_index(real_net, ifindex);
+
+ /* iflink to itself, most likely physical device */
+ if (net == real_net && netdev->ifindex == iflink) {
+ real_netdev = netdev;
+ dev_hold(real_netdev);
+ goto out;
+ }
+
+ real_netdev = dev_get_by_index(real_net, iflink);
out:
if (hard_iface)
@@ -484,8 +484,8 @@
if (new_hard_iface)
kref_get(&new_hard_iface->refcount);
- curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
- rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
+ curr_hard_iface = rcu_replace_pointer(bat_priv->primary_if,
+ new_hard_iface, 1);
if (!new_hard_iface)
goto out;
@@ -613,7 +613,7 @@
/* report to the other components the maximum amount of bytes that
* batman-adv can send over the wire (without considering the payload
* overhead). For example, this value is used by TT to compute the
- * maximum local table table size
+ * maximum local table size
*/
atomic_set(&bat_priv->packet_size_max, min_mtu);
@@ -632,7 +632,19 @@
*/
void batadv_update_min_mtu(struct net_device *soft_iface)
{
- soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
+ struct batadv_priv *bat_priv = netdev_priv(soft_iface);
+ int limit_mtu;
+ int mtu;
+
+ mtu = batadv_hardif_min_mtu(soft_iface);
+
+ if (bat_priv->mtu_set_by_user)
+ limit_mtu = bat_priv->mtu_set_by_user;
+ else
+ limit_mtu = ETH_DATA_LEN;
+
+ mtu = min(mtu, limit_mtu);
+ dev_set_mtu(soft_iface, mtu);
/* Check if the local translate table should be cleaned up to match a
* new (and smaller) MTU.
@@ -694,8 +706,8 @@
* @slave: the interface enslaved in another master
* @master: the master from which slave has to be removed
*
- * Invoke ndo_del_slave on master passing slave as argument. In this way slave
- * is free'd and master can correctly change its internal state.
+ * Invoke ndo_del_slave on master passing slave as argument. In this way the
+ * slave is free'd and the master can correctly change its internal state.
*
* Return: 0 on success, a negative value representing the error otherwise
*/
@@ -768,11 +780,6 @@
hard_iface->soft_iface = soft_iface;
bat_priv = netdev_priv(hard_iface->soft_iface);
- if (bat_priv->num_ifaces >= UINT_MAX) {
- ret = -ENOSPC;
- goto err_dev;
- }
-
ret = netdev_master_upper_dev_link(hard_iface->net_dev,
soft_iface, NULL, NULL, NULL);
if (ret)
@@ -782,16 +789,7 @@
if (ret < 0)
goto err_upper;
- hard_iface->if_num = bat_priv->num_ifaces;
- bat_priv->num_ifaces++;
hard_iface->if_status = BATADV_IF_INACTIVE;
- ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
- if (ret < 0) {
- bat_priv->algo_ops->iface.disable(hard_iface);
- bat_priv->num_ifaces--;
- hard_iface->if_status = BATADV_IF_NOT_IN_USE;
- goto err_upper;
- }
kref_get(&hard_iface->refcount);
hard_iface->batman_adv_ptype.type = ethertype;
@@ -842,6 +840,33 @@
}
/**
+ * batadv_hardif_cnt() - get number of interfaces enslaved to soft interface
+ * @soft_iface: soft interface to check
+ *
+ * This function is only using RCU for locking - the result can therefore be
+ * off when another function is modifying the list at the same time. The
+ * caller can use the rtnl_lock to make sure that the count is accurate.
+ *
+ * Return: number of connected/enslaved hard interfaces
+ */
+static size_t batadv_hardif_cnt(const struct net_device *soft_iface)
+{
+ struct batadv_hard_iface *hard_iface;
+ size_t count = 0;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+ if (hard_iface->soft_iface != soft_iface)
+ continue;
+
+ count++;
+ }
+ rcu_read_unlock();
+
+ return count;
+}
+
+/**
* batadv_hardif_disable_interface() - Remove hard interface from soft interface
* @hard_iface: hard interface to be removed
* @autodel: whether to delete soft interface when it doesn't contain any other
@@ -862,9 +887,6 @@
hard_iface->net_dev->name);
dev_remove_pack(&hard_iface->batman_adv_ptype);
batadv_hardif_put(hard_iface);
-
- 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) {
@@ -889,7 +911,7 @@
batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
/* nobody uses this interface anymore */
- if (bat_priv->num_ifaces == 0) {
+ if (batadv_hardif_cnt(hard_iface->soft_iface) <= 1) {
batadv_gw_check_client_stop(bat_priv);
if (autodel == BATADV_IF_CLEANUP_AUTO)
@@ -925,14 +947,11 @@
if (ret)
goto free_if;
- hard_iface->if_num = 0;
hard_iface->net_dev = net_dev;
hard_iface->soft_iface = NULL;
hard_iface->if_status = BATADV_IF_NOT_IN_USE;
- ret = batadv_debugfs_add_hardif(hard_iface);
- if (ret)
- goto free_sysfs;
+ batadv_debugfs_add_hardif(hard_iface);
INIT_LIST_HEAD(&hard_iface->list);
INIT_HLIST_HEAD(&hard_iface->neigh_list);
@@ -946,16 +965,17 @@
if (batadv_is_wifi_hardif(hard_iface))
hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
+ atomic_set(&hard_iface->hop_penalty, 0);
+
batadv_v_hardif_init(hard_iface);
batadv_check_known_mac_addr(hard_iface->net_dev);
kref_get(&hard_iface->refcount);
list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
+ batadv_hardif_generation++;
return hard_iface;
-free_sysfs:
- batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
free_if:
kfree(hard_iface);
release_dev:
@@ -980,22 +1000,6 @@
batadv_debugfs_del_hardif(hard_iface);
batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
batadv_hardif_put(hard_iface);
-}
-
-/**
- * batadv_hardif_remove_interfaces() - Remove all hard interfaces
- */
-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();
}
/**
@@ -1054,6 +1058,7 @@
case NETDEV_UNREGISTER:
case NETDEV_PRE_TYPE_CHANGE:
list_del_rcu(&hard_iface->list);
+ batadv_hardif_generation++;
batadv_hardif_remove_interface(hard_iface);
break;
--
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