1099 строки
29 KiB
C
1099 строки
29 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2007-2020 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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#include "hard-interface.h"
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/byteorder/generic.h>
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#include <linux/errno.h>
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#include <linux/gfp.h>
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#include <linux/if.h>
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#include <linux/if_arp.h>
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#include <linux/if_ether.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/limits.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/printk.h>
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#include <linux/rculist.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <net/net_namespace.h>
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#include <net/rtnetlink.h>
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#include <uapi/linux/batadv_packet.h>
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#include "bat_v.h"
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#include "bridge_loop_avoidance.h"
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#include "debugfs.h"
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#include "distributed-arp-table.h"
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#include "gateway_client.h"
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#include "log.h"
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#include "originator.h"
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#include "send.h"
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#include "soft-interface.h"
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#include "sysfs.h"
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#include "translation-table.h"
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/**
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* batadv_hardif_release() - release hard interface from lists and queue for
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* free after rcu grace period
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* @ref: kref pointer of the hard interface
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*/
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void batadv_hardif_release(struct kref *ref)
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{
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struct batadv_hard_iface *hard_iface;
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hard_iface = container_of(ref, struct batadv_hard_iface, refcount);
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dev_put(hard_iface->net_dev);
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kfree_rcu(hard_iface, rcu);
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}
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/**
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* batadv_hardif_get_by_netdev() - Get hard interface object of a net_device
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* @net_dev: net_device to search for
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*
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* Return: batadv_hard_iface of net_dev (with increased refcnt), NULL on errors
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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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kref_get_unless_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_getlink_net() - return link net namespace (of use fallback)
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* @netdev: net_device to check
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* @fallback_net: return in case get_link_net is not available for @netdev
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*
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* Return: result of rtnl_link_ops->get_link_net or @fallback_net
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*/
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static struct net *batadv_getlink_net(const struct net_device *netdev,
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struct net *fallback_net)
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{
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if (!netdev->rtnl_link_ops)
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return fallback_net;
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if (!netdev->rtnl_link_ops->get_link_net)
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return fallback_net;
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return netdev->rtnl_link_ops->get_link_net(netdev);
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}
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/**
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* batadv_mutual_parents() - check if two devices are each others parent
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* @dev1: 1st net dev
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* @net1: 1st devices netns
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* @dev2: 2nd net dev
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* @net2: 2nd devices netns
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*
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* veth devices come in pairs and each is the parent of the other!
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*
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* Return: true if the devices are each others parent, otherwise false
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*/
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static bool batadv_mutual_parents(const struct net_device *dev1,
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struct net *net1,
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const struct net_device *dev2,
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struct net *net2)
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{
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int dev1_parent_iflink = dev_get_iflink(dev1);
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int dev2_parent_iflink = dev_get_iflink(dev2);
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const struct net *dev1_parent_net;
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const struct net *dev2_parent_net;
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dev1_parent_net = batadv_getlink_net(dev1, net1);
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dev2_parent_net = batadv_getlink_net(dev2, net2);
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if (!dev1_parent_iflink || !dev2_parent_iflink)
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return false;
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return (dev1_parent_iflink == dev2->ifindex) &&
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(dev2_parent_iflink == dev1->ifindex) &&
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net_eq(dev1_parent_net, net2) &&
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net_eq(dev2_parent_net, net1);
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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 from being used to create a new
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* mesh network (this behaviour would lead to a batman-over-batman
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* configuration). This function recursively checks all the fathers of the
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* device passed as argument looking for a batman-adv soft interface.
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*
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* Return: 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 *net = dev_net(net_dev);
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struct net_device *parent_dev;
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struct net *parent_net;
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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 (dev_get_iflink(net_dev) == 0 ||
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dev_get_iflink(net_dev) == net_dev->ifindex)
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return false;
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parent_net = batadv_getlink_net(net_dev, net);
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/* recurse over the parent device */
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parent_dev = __dev_get_by_index((struct net *)parent_net,
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dev_get_iflink(net_dev));
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/* if we got a NULL parent_dev there is something broken.. */
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if (!parent_dev) {
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pr_err("Cannot find parent device\n");
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return false;
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}
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if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
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return false;
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ret = batadv_is_on_batman_iface(parent_dev);
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return ret;
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}
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static bool 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 false;
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if (net_dev->type != ARPHRD_ETHER)
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return false;
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if (net_dev->addr_len != ETH_ALEN)
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return false;
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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 false;
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return true;
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}
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/**
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* batadv_get_real_netdevice() - check if the given netdev struct is a virtual
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* interface on top of another 'real' interface
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* @netdev: the device to check
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*
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* Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev()
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* instead of this.
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*
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* Return: the 'real' net device or the original net device and NULL in case
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* of an error.
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*/
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static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
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{
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struct batadv_hard_iface *hard_iface = NULL;
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struct net_device *real_netdev = NULL;
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struct net *real_net;
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struct net *net;
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int ifindex;
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ASSERT_RTNL();
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if (!netdev)
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return NULL;
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if (netdev->ifindex == dev_get_iflink(netdev)) {
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dev_hold(netdev);
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return netdev;
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}
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hard_iface = batadv_hardif_get_by_netdev(netdev);
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if (!hard_iface || !hard_iface->soft_iface)
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goto out;
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net = dev_net(hard_iface->soft_iface);
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ifindex = dev_get_iflink(netdev);
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real_net = batadv_getlink_net(netdev, net);
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real_netdev = dev_get_by_index(real_net, ifindex);
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out:
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if (hard_iface)
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batadv_hardif_put(hard_iface);
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return real_netdev;
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}
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/**
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* batadv_get_real_netdev() - check if the given net_device struct is a virtual
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* interface on top of another 'real' interface
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* @net_device: the device to check
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*
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* Return: the 'real' net device or the original net device and NULL in case
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* of an error.
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*/
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struct net_device *batadv_get_real_netdev(struct net_device *net_device)
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{
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struct net_device *real_netdev;
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rtnl_lock();
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real_netdev = batadv_get_real_netdevice(net_device);
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rtnl_unlock();
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return real_netdev;
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}
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/**
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* batadv_is_wext_netdev() - check if the given net_device struct is a
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* wext wifi interface
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* @net_device: the device to check
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*
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* Return: true if the net device is a wext wireless device, false
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* otherwise.
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*/
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static bool batadv_is_wext_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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return false;
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}
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/**
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* batadv_is_cfg80211_netdev() - check if the given net_device struct is a
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* cfg80211 wifi interface
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* @net_device: the device to check
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*
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* Return: true if the net device is a cfg80211 wireless device, false
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* otherwise.
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*/
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static bool batadv_is_cfg80211_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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/* 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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/**
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* batadv_wifi_flags_evaluate() - calculate wifi flags for net_device
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* @net_device: the device to check
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*
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* Return: batadv_hard_iface_wifi_flags flags of the device
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*/
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static u32 batadv_wifi_flags_evaluate(struct net_device *net_device)
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{
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u32 wifi_flags = 0;
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struct net_device *real_netdev;
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if (batadv_is_wext_netdev(net_device))
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wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT;
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if (batadv_is_cfg80211_netdev(net_device))
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wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
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real_netdev = batadv_get_real_netdevice(net_device);
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if (!real_netdev)
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return wifi_flags;
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if (real_netdev == net_device)
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goto out;
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if (batadv_is_wext_netdev(real_netdev))
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wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT;
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if (batadv_is_cfg80211_netdev(real_netdev))
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wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
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out:
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dev_put(real_netdev);
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return wifi_flags;
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}
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/**
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* batadv_is_cfg80211_hardif() - check if the given hardif is a cfg80211 wifi
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* interface
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* @hard_iface: the device to check
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*
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* Return: true if the net device is a cfg80211 wireless device, false
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* otherwise.
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*/
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bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface)
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{
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u32 allowed_flags = 0;
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allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
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allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
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return !!(hard_iface->wifi_flags & allowed_flags);
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}
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/**
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* batadv_is_wifi_hardif() - check if the given hardif is a wifi interface
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* @hard_iface: the device to check
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*
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* Return: 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_hardif(struct batadv_hard_iface *hard_iface)
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{
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if (!hard_iface)
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return false;
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return hard_iface->wifi_flags != 0;
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}
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/**
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* batadv_hardif_no_broadcast() - check whether (re)broadcast is necessary
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* @if_outgoing: the outgoing interface checked and considered for (re)broadcast
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* @orig_addr: the originator of this packet
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* @orig_neigh: originator address of the forwarder we just got the packet from
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* (NULL if we originated)
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*
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* Checks whether a packet needs to be (re)broadcasted on the given interface.
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*
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* Return:
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* BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface
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* BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder
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* BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator
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* BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast
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*/
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int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
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u8 *orig_addr, u8 *orig_neigh)
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{
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struct batadv_hardif_neigh_node *hardif_neigh;
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struct hlist_node *first;
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int ret = BATADV_HARDIF_BCAST_OK;
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rcu_read_lock();
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/* 0 neighbors -> no (re)broadcast */
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first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list));
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if (!first) {
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ret = BATADV_HARDIF_BCAST_NORECIPIENT;
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goto out;
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}
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/* >1 neighbors -> (re)brodcast */
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if (rcu_dereference(hlist_next_rcu(first)))
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goto out;
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hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node,
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list);
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/* 1 neighbor, is the originator -> no rebroadcast */
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if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) {
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ret = BATADV_HARDIF_BCAST_DUPORIG;
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/* 1 neighbor, is the one we received from -> no rebroadcast */
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} else if (orig_neigh &&
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batadv_compare_eth(hardif_neigh->orig, orig_neigh)) {
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ret = BATADV_HARDIF_BCAST_DUPFWD;
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}
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out:
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rcu_read_unlock();
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return ret;
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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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kref_get_unless_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_put(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)
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kref_get(&new_hard_iface->refcount);
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curr_hard_iface = rcu_replace_pointer(bat_priv->primary_if,
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new_hard_iface, 1);
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if (!new_hard_iface)
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goto out;
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bat_priv->algo_ops->iface.primary_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_put(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 &&
|
|
hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
|
|
continue;
|
|
|
|
if (hard_iface->net_dev == net_dev)
|
|
continue;
|
|
|
|
if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
|
|
net_dev->dev_addr))
|
|
continue;
|
|
|
|
pr_warn("The newly added mac address (%pM) already exists on: %s\n",
|
|
net_dev->dev_addr, hard_iface->net_dev->name);
|
|
pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
|
|
* @soft_iface: netdev struct of the mesh interface
|
|
*/
|
|
static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
|
|
{
|
|
const struct batadv_hard_iface *hard_iface;
|
|
unsigned short lower_header_len = ETH_HLEN;
|
|
unsigned short lower_headroom = 0;
|
|
unsigned short lower_tailroom = 0;
|
|
unsigned short needed_headroom;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
|
|
if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
|
|
continue;
|
|
|
|
if (hard_iface->soft_iface != soft_iface)
|
|
continue;
|
|
|
|
lower_header_len = max_t(unsigned short, lower_header_len,
|
|
hard_iface->net_dev->hard_header_len);
|
|
|
|
lower_headroom = max_t(unsigned short, lower_headroom,
|
|
hard_iface->net_dev->needed_headroom);
|
|
|
|
lower_tailroom = max_t(unsigned short, lower_tailroom,
|
|
hard_iface->net_dev->needed_tailroom);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
|
|
needed_headroom += batadv_max_header_len();
|
|
|
|
soft_iface->needed_headroom = needed_headroom;
|
|
soft_iface->needed_tailroom = lower_tailroom;
|
|
}
|
|
|
|
/**
|
|
* batadv_hardif_min_mtu() - Calculate maximum MTU for soft interface
|
|
* @soft_iface: netdev struct of the soft interface
|
|
*
|
|
* Return: MTU for the soft-interface (limited by the minimal MTU of all active
|
|
* slave interfaces)
|
|
*/
|
|
int batadv_hardif_min_mtu(struct net_device *soft_iface)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
|
|
const struct batadv_hard_iface *hard_iface;
|
|
int min_mtu = INT_MAX;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
|
|
if (hard_iface->if_status != BATADV_IF_ACTIVE &&
|
|
hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
|
|
continue;
|
|
|
|
if (hard_iface->soft_iface != soft_iface)
|
|
continue;
|
|
|
|
min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (atomic_read(&bat_priv->fragmentation) == 0)
|
|
goto out;
|
|
|
|
/* with fragmentation enabled the maximum size of internally generated
|
|
* packets such as translation table exchanges or tvlv containers, etc
|
|
* has to be calculated
|
|
*/
|
|
min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
|
|
min_mtu -= sizeof(struct batadv_frag_packet);
|
|
min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
|
|
|
|
out:
|
|
/* 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
|
|
*/
|
|
atomic_set(&bat_priv->packet_size_max, min_mtu);
|
|
|
|
/* the real soft-interface MTU is computed by removing the payload
|
|
* overhead from the maximum amount of bytes that was just computed.
|
|
*
|
|
* However batman-adv does not support MTUs bigger than ETH_DATA_LEN
|
|
*/
|
|
return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
|
|
}
|
|
|
|
/**
|
|
* batadv_update_min_mtu() - Adjusts the MTU if a new interface with a smaller
|
|
* MTU appeared
|
|
* @soft_iface: netdev struct of the soft interface
|
|
*/
|
|
void batadv_update_min_mtu(struct net_device *soft_iface)
|
|
{
|
|
soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
|
|
|
|
/* Check if the local translate table should be cleaned up to match a
|
|
* new (and smaller) MTU.
|
|
*/
|
|
batadv_tt_local_resize_to_mtu(soft_iface);
|
|
}
|
|
|
|
static void
|
|
batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_priv *bat_priv;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
|
|
if (hard_iface->if_status != BATADV_IF_INACTIVE)
|
|
goto out;
|
|
|
|
bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
|
|
bat_priv->algo_ops->iface.update_mac(hard_iface);
|
|
hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
|
|
|
|
/* the first active interface becomes our primary interface or
|
|
* the next active interface after the old primary interface was removed
|
|
*/
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
batadv_primary_if_select(bat_priv, hard_iface);
|
|
|
|
batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
|
|
hard_iface->net_dev->name);
|
|
|
|
batadv_update_min_mtu(hard_iface->soft_iface);
|
|
|
|
if (bat_priv->algo_ops->iface.activate)
|
|
bat_priv->algo_ops->iface.activate(hard_iface);
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
}
|
|
|
|
static void
|
|
batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
if (hard_iface->if_status != BATADV_IF_ACTIVE &&
|
|
hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
|
|
return;
|
|
|
|
hard_iface->if_status = BATADV_IF_INACTIVE;
|
|
|
|
batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
|
|
hard_iface->net_dev->name);
|
|
|
|
batadv_update_min_mtu(hard_iface->soft_iface);
|
|
}
|
|
|
|
/**
|
|
* batadv_master_del_slave() - remove hard_iface from the current master iface
|
|
* @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 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
|
|
*/
|
|
static int batadv_master_del_slave(struct batadv_hard_iface *slave,
|
|
struct net_device *master)
|
|
{
|
|
int ret;
|
|
|
|
if (!master)
|
|
return 0;
|
|
|
|
ret = -EBUSY;
|
|
if (master->netdev_ops->ndo_del_slave)
|
|
ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_hardif_enable_interface() - Enslave hard interface to soft interface
|
|
* @hard_iface: hard interface to add to soft interface
|
|
* @net: the applicable net namespace
|
|
* @iface_name: name of the soft interface
|
|
*
|
|
* Return: 0 on success or negative error number in case of failure
|
|
*/
|
|
int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
|
|
struct net *net, const char *iface_name)
|
|
{
|
|
struct batadv_priv *bat_priv;
|
|
struct net_device *soft_iface, *master;
|
|
__be16 ethertype = htons(ETH_P_BATMAN);
|
|
int max_header_len = batadv_max_header_len();
|
|
int ret;
|
|
|
|
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
|
|
goto out;
|
|
|
|
kref_get(&hard_iface->refcount);
|
|
|
|
soft_iface = dev_get_by_name(net, iface_name);
|
|
|
|
if (!soft_iface) {
|
|
soft_iface = batadv_softif_create(net, iface_name);
|
|
|
|
if (!soft_iface) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
/* dev_get_by_name() increases the reference counter for us */
|
|
dev_hold(soft_iface);
|
|
}
|
|
|
|
if (!batadv_softif_is_valid(soft_iface)) {
|
|
pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
|
|
soft_iface->name);
|
|
ret = -EINVAL;
|
|
goto err_dev;
|
|
}
|
|
|
|
/* check if the interface is enslaved in another virtual one and
|
|
* in that case unlink it first
|
|
*/
|
|
master = netdev_master_upper_dev_get(hard_iface->net_dev);
|
|
ret = batadv_master_del_slave(hard_iface, master);
|
|
if (ret)
|
|
goto err_dev;
|
|
|
|
hard_iface->soft_iface = soft_iface;
|
|
bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
|
|
ret = netdev_master_upper_dev_link(hard_iface->net_dev,
|
|
soft_iface, NULL, NULL, NULL);
|
|
if (ret)
|
|
goto err_dev;
|
|
|
|
ret = bat_priv->algo_ops->iface.enable(hard_iface);
|
|
if (ret < 0)
|
|
goto err_upper;
|
|
|
|
hard_iface->if_status = BATADV_IF_INACTIVE;
|
|
|
|
kref_get(&hard_iface->refcount);
|
|
hard_iface->batman_adv_ptype.type = ethertype;
|
|
hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
|
|
hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
|
|
dev_add_pack(&hard_iface->batman_adv_ptype);
|
|
|
|
batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
|
|
hard_iface->net_dev->name);
|
|
|
|
if (atomic_read(&bat_priv->fragmentation) &&
|
|
hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
|
|
batadv_info(hard_iface->soft_iface,
|
|
"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",
|
|
hard_iface->net_dev->name, hard_iface->net_dev->mtu,
|
|
ETH_DATA_LEN + max_header_len);
|
|
|
|
if (!atomic_read(&bat_priv->fragmentation) &&
|
|
hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
|
|
batadv_info(hard_iface->soft_iface,
|
|
"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",
|
|
hard_iface->net_dev->name, hard_iface->net_dev->mtu,
|
|
ETH_DATA_LEN + max_header_len);
|
|
|
|
if (batadv_hardif_is_iface_up(hard_iface))
|
|
batadv_hardif_activate_interface(hard_iface);
|
|
else
|
|
batadv_err(hard_iface->soft_iface,
|
|
"Not using interface %s (retrying later): interface not active\n",
|
|
hard_iface->net_dev->name);
|
|
|
|
batadv_hardif_recalc_extra_skbroom(soft_iface);
|
|
|
|
if (bat_priv->algo_ops->iface.enabled)
|
|
bat_priv->algo_ops->iface.enabled(hard_iface);
|
|
|
|
out:
|
|
return 0;
|
|
|
|
err_upper:
|
|
netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
|
|
err_dev:
|
|
hard_iface->soft_iface = NULL;
|
|
dev_put(soft_iface);
|
|
err:
|
|
batadv_hardif_put(hard_iface);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* slave interfaces
|
|
*/
|
|
void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
|
|
enum batadv_hard_if_cleanup autodel)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
|
|
batadv_hardif_deactivate_interface(hard_iface);
|
|
|
|
if (hard_iface->if_status != BATADV_IF_INACTIVE)
|
|
goto out;
|
|
|
|
batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
|
|
hard_iface->net_dev->name);
|
|
dev_remove_pack(&hard_iface->batman_adv_ptype);
|
|
batadv_hardif_put(hard_iface);
|
|
|
|
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_put(new_if);
|
|
}
|
|
|
|
bat_priv->algo_ops->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);
|
|
|
|
netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
|
|
batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
|
|
|
|
/* nobody uses this interface anymore */
|
|
if (batadv_hardif_cnt(hard_iface->soft_iface) <= 1) {
|
|
batadv_gw_check_client_stop(bat_priv);
|
|
|
|
if (autodel == BATADV_IF_CLEANUP_AUTO)
|
|
batadv_softif_destroy_sysfs(hard_iface->soft_iface);
|
|
}
|
|
|
|
hard_iface->soft_iface = NULL;
|
|
batadv_hardif_put(hard_iface);
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
}
|
|
|
|
static struct batadv_hard_iface *
|
|
batadv_hardif_add_interface(struct net_device *net_dev)
|
|
{
|
|
struct batadv_hard_iface *hard_iface;
|
|
int ret;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!batadv_is_valid_iface(net_dev))
|
|
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->net_dev = net_dev;
|
|
hard_iface->soft_iface = NULL;
|
|
hard_iface->if_status = BATADV_IF_NOT_IN_USE;
|
|
|
|
batadv_debugfs_add_hardif(hard_iface);
|
|
|
|
INIT_LIST_HEAD(&hard_iface->list);
|
|
INIT_HLIST_HEAD(&hard_iface->neigh_list);
|
|
|
|
mutex_init(&hard_iface->bat_iv.ogm_buff_mutex);
|
|
spin_lock_init(&hard_iface->neigh_list_lock);
|
|
kref_init(&hard_iface->refcount);
|
|
|
|
hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
|
|
hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
|
|
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_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_KEEP);
|
|
|
|
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
|
|
return;
|
|
|
|
hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
|
|
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_generation++;
|
|
batadv_hardif_remove_interface(hard_iface);
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
/**
|
|
* batadv_hard_if_event_softif() - Handle events for soft interfaces
|
|
* @event: NETDEV_* event to handle
|
|
* @net_dev: net_device which generated an event
|
|
*
|
|
* Return: NOTIFY_* result
|
|
*/
|
|
static int batadv_hard_if_event_softif(unsigned long event,
|
|
struct net_device *net_dev)
|
|
{
|
|
struct batadv_priv *bat_priv;
|
|
|
|
switch (event) {
|
|
case NETDEV_REGISTER:
|
|
batadv_sysfs_add_meshif(net_dev);
|
|
bat_priv = netdev_priv(net_dev);
|
|
batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
|
|
break;
|
|
case NETDEV_CHANGENAME:
|
|
batadv_debugfs_rename_meshif(net_dev);
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
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))
|
|
return batadv_hard_if_event_softif(event, net_dev);
|
|
|
|
hard_iface = batadv_hardif_get_by_netdev(net_dev);
|
|
if (!hard_iface && (event == NETDEV_REGISTER ||
|
|
event == NETDEV_POST_TYPE_CHANGE))
|
|
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:
|
|
case NETDEV_PRE_TYPE_CHANGE:
|
|
list_del_rcu(&hard_iface->list);
|
|
batadv_hardif_generation++;
|
|
|
|
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->algo_ops->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;
|
|
case NETDEV_CHANGEUPPER:
|
|
hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
|
|
if (batadv_is_wifi_hardif(hard_iface))
|
|
hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
|
|
break;
|
|
case NETDEV_CHANGENAME:
|
|
batadv_debugfs_rename_hardif(hard_iface);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
hardif_put:
|
|
batadv_hardif_put(hard_iface);
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
struct notifier_block batadv_hard_if_notifier = {
|
|
.notifier_call = batadv_hard_if_event,
|
|
};
|