![Paul E. McKenney](/assets/img/avatar_default.png)
Remove all rcu head inits. We don't care about the RCU head state before passing it to call_rcu() anyway. Only leave the "on_stack" variants so debugobjects can keep track of objects on stack. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Cc: Marek Lindner <lindner_marek@yahoo.de> Cc: Sven Eckelmann <sven.eckelmann@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
537 lines
12 KiB
C
537 lines
12 KiB
C
/*
|
|
* Copyright (C) 2007-2010 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, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA
|
|
*
|
|
*/
|
|
|
|
#include "main.h"
|
|
#include "hard-interface.h"
|
|
#include "soft-interface.h"
|
|
#include "send.h"
|
|
#include "translation-table.h"
|
|
#include "routing.h"
|
|
#include "bat_sysfs.h"
|
|
#include "originator.h"
|
|
#include "hash.h"
|
|
|
|
#include <linux/if_arp.h>
|
|
|
|
#define MIN(x, y) ((x) < (y) ? (x) : (y))
|
|
|
|
struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev)
|
|
{
|
|
struct batman_if *batman_if;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(batman_if, &if_list, list) {
|
|
if (batman_if->net_dev == net_dev)
|
|
goto out;
|
|
}
|
|
|
|
batman_if = NULL;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return batman_if;
|
|
}
|
|
|
|
static int is_valid_iface(struct net_device *net_dev)
|
|
{
|
|
if (net_dev->flags & IFF_LOOPBACK)
|
|
return 0;
|
|
|
|
if (net_dev->type != ARPHRD_ETHER)
|
|
return 0;
|
|
|
|
if (net_dev->addr_len != ETH_ALEN)
|
|
return 0;
|
|
|
|
/* no batman over batman */
|
|
#ifdef HAVE_NET_DEVICE_OPS
|
|
if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
|
|
return 0;
|
|
#else
|
|
if (net_dev->hard_start_xmit == interface_tx)
|
|
return 0;
|
|
#endif
|
|
|
|
/* Device is being bridged */
|
|
/* if (net_dev->br_port != NULL)
|
|
return 0; */
|
|
|
|
return 1;
|
|
}
|
|
|
|
static struct batman_if *get_active_batman_if(void)
|
|
{
|
|
struct batman_if *batman_if;
|
|
|
|
/* TODO: should check interfaces belonging to bat_priv */
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(batman_if, &if_list, list) {
|
|
if (batman_if->if_status == IF_ACTIVE)
|
|
goto out;
|
|
}
|
|
|
|
batman_if = NULL;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return batman_if;
|
|
}
|
|
|
|
static void set_primary_if(struct bat_priv *bat_priv,
|
|
struct batman_if *batman_if)
|
|
{
|
|
struct batman_packet *batman_packet;
|
|
|
|
bat_priv->primary_if = batman_if;
|
|
|
|
if (!bat_priv->primary_if)
|
|
return;
|
|
|
|
set_main_if_addr(batman_if->net_dev->dev_addr);
|
|
|
|
batman_packet = (struct batman_packet *)(batman_if->packet_buff);
|
|
batman_packet->flags = 0;
|
|
batman_packet->ttl = TTL;
|
|
|
|
/***
|
|
* hacky trick to make sure that we send the HNA information via
|
|
* our new primary interface
|
|
*/
|
|
atomic_set(&hna_local_changed, 1);
|
|
}
|
|
|
|
static bool hardif_is_iface_up(struct batman_if *batman_if)
|
|
{
|
|
if (batman_if->net_dev->flags & IFF_UP)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static void update_mac_addresses(struct batman_if *batman_if)
|
|
{
|
|
addr_to_string(batman_if->addr_str, batman_if->net_dev->dev_addr);
|
|
|
|
memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig,
|
|
batman_if->net_dev->dev_addr, ETH_ALEN);
|
|
memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender,
|
|
batman_if->net_dev->dev_addr, ETH_ALEN);
|
|
}
|
|
|
|
static void check_known_mac_addr(uint8_t *addr)
|
|
{
|
|
struct batman_if *batman_if;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(batman_if, &if_list, list) {
|
|
if ((batman_if->if_status != IF_ACTIVE) &&
|
|
(batman_if->if_status != IF_TO_BE_ACTIVATED))
|
|
continue;
|
|
|
|
if (!compare_orig(batman_if->net_dev->dev_addr, addr))
|
|
continue;
|
|
|
|
printk(KERN_WARNING "batman-adv:"
|
|
"The newly added mac address (%pM) already exists on: %s\n",
|
|
addr, batman_if->dev);
|
|
printk(KERN_WARNING "batman-adv:"
|
|
"It is strongly recommended to keep mac addresses unique"
|
|
"to avoid problems!\n");
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
int hardif_min_mtu(void)
|
|
{
|
|
struct batman_if *batman_if;
|
|
/* allow big frames if all devices are capable to do so
|
|
* (have MTU > 1500 + BAT_HEADER_LEN) */
|
|
int min_mtu = ETH_DATA_LEN;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(batman_if, &if_list, list) {
|
|
if ((batman_if->if_status == IF_ACTIVE) ||
|
|
(batman_if->if_status == IF_TO_BE_ACTIVATED))
|
|
min_mtu = MIN(batman_if->net_dev->mtu - BAT_HEADER_LEN,
|
|
min_mtu);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return min_mtu;
|
|
}
|
|
|
|
/* adjusts the MTU if a new interface with a smaller MTU appeared. */
|
|
void update_min_mtu(void)
|
|
{
|
|
int min_mtu;
|
|
|
|
min_mtu = hardif_min_mtu();
|
|
if (soft_device->mtu != min_mtu)
|
|
soft_device->mtu = min_mtu;
|
|
}
|
|
|
|
static void hardif_activate_interface(struct bat_priv *bat_priv,
|
|
struct batman_if *batman_if)
|
|
{
|
|
if (batman_if->if_status != IF_INACTIVE)
|
|
return;
|
|
|
|
dev_hold(batman_if->net_dev);
|
|
|
|
update_mac_addresses(batman_if);
|
|
batman_if->if_status = IF_TO_BE_ACTIVATED;
|
|
|
|
/**
|
|
* the first active interface becomes our primary interface or
|
|
* the next active interface after the old primay interface was removed
|
|
*/
|
|
if (!bat_priv->primary_if)
|
|
set_primary_if(bat_priv, batman_if);
|
|
|
|
printk(KERN_INFO "batman-adv:Interface activated: %s\n",
|
|
batman_if->dev);
|
|
|
|
if (atomic_read(&module_state) == MODULE_INACTIVE)
|
|
activate_module();
|
|
|
|
update_min_mtu();
|
|
return;
|
|
}
|
|
|
|
static void hardif_deactivate_interface(struct batman_if *batman_if)
|
|
{
|
|
if ((batman_if->if_status != IF_ACTIVE) &&
|
|
(batman_if->if_status != IF_TO_BE_ACTIVATED))
|
|
return;
|
|
|
|
dev_put(batman_if->net_dev);
|
|
|
|
batman_if->if_status = IF_INACTIVE;
|
|
|
|
printk(KERN_INFO "batman-adv:Interface deactivated: %s\n",
|
|
batman_if->dev);
|
|
|
|
update_min_mtu();
|
|
}
|
|
|
|
int hardif_enable_interface(struct batman_if *batman_if)
|
|
{
|
|
/* FIXME: each batman_if will be attached to a softif */
|
|
struct bat_priv *bat_priv = netdev_priv(soft_device);
|
|
struct batman_packet *batman_packet;
|
|
|
|
if (batman_if->if_status != IF_NOT_IN_USE)
|
|
goto out;
|
|
|
|
batman_if->packet_len = BAT_PACKET_LEN;
|
|
batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_ATOMIC);
|
|
|
|
if (!batman_if->packet_buff) {
|
|
printk(KERN_ERR "batman-adv:"
|
|
"Can't add interface packet (%s): out of memory\n",
|
|
batman_if->dev);
|
|
goto err;
|
|
}
|
|
|
|
batman_packet = (struct batman_packet *)(batman_if->packet_buff);
|
|
batman_packet->packet_type = BAT_PACKET;
|
|
batman_packet->version = COMPAT_VERSION;
|
|
batman_packet->flags = 0;
|
|
batman_packet->ttl = 2;
|
|
batman_packet->tq = TQ_MAX_VALUE;
|
|
batman_packet->num_hna = 0;
|
|
|
|
batman_if->if_num = bat_priv->num_ifaces;
|
|
bat_priv->num_ifaces++;
|
|
batman_if->if_status = IF_INACTIVE;
|
|
orig_hash_add_if(batman_if, bat_priv->num_ifaces);
|
|
|
|
atomic_set(&batman_if->seqno, 1);
|
|
printk(KERN_INFO "batman-adv:Adding interface: %s\n", batman_if->dev);
|
|
|
|
if (hardif_is_iface_up(batman_if))
|
|
hardif_activate_interface(bat_priv, batman_if);
|
|
else
|
|
printk(KERN_ERR "batman-adv:"
|
|
"Not using interface %s "
|
|
"(retrying later): interface not active\n",
|
|
batman_if->dev);
|
|
|
|
/* begin scheduling originator messages on that interface */
|
|
schedule_own_packet(batman_if);
|
|
|
|
out:
|
|
return 0;
|
|
|
|
err:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void hardif_disable_interface(struct batman_if *batman_if)
|
|
{
|
|
/* FIXME: each batman_if will be attached to a softif */
|
|
struct bat_priv *bat_priv = netdev_priv(soft_device);
|
|
|
|
if (batman_if->if_status == IF_ACTIVE)
|
|
hardif_deactivate_interface(batman_if);
|
|
|
|
if (batman_if->if_status != IF_INACTIVE)
|
|
return;
|
|
|
|
printk(KERN_INFO "batman-adv:Removing interface: %s\n", batman_if->dev);
|
|
bat_priv->num_ifaces--;
|
|
orig_hash_del_if(batman_if, bat_priv->num_ifaces);
|
|
|
|
if (batman_if == bat_priv->primary_if)
|
|
set_primary_if(bat_priv, get_active_batman_if());
|
|
|
|
kfree(batman_if->packet_buff);
|
|
batman_if->packet_buff = NULL;
|
|
batman_if->if_status = IF_NOT_IN_USE;
|
|
|
|
if ((atomic_read(&module_state) == MODULE_ACTIVE) &&
|
|
(bat_priv->num_ifaces == 0))
|
|
deactivate_module();
|
|
}
|
|
|
|
static struct batman_if *hardif_add_interface(struct net_device *net_dev)
|
|
{
|
|
struct batman_if *batman_if;
|
|
int ret;
|
|
|
|
ret = is_valid_iface(net_dev);
|
|
if (ret != 1)
|
|
goto out;
|
|
|
|
batman_if = kmalloc(sizeof(struct batman_if), GFP_ATOMIC);
|
|
if (!batman_if) {
|
|
printk(KERN_ERR "batman-adv:"
|
|
"Can't add interface (%s): out of memory\n",
|
|
net_dev->name);
|
|
goto out;
|
|
}
|
|
|
|
batman_if->dev = kstrdup(net_dev->name, GFP_ATOMIC);
|
|
if (!batman_if->dev)
|
|
goto free_if;
|
|
|
|
ret = sysfs_add_hardif(&batman_if->hardif_obj, net_dev);
|
|
if (ret)
|
|
goto free_dev;
|
|
|
|
batman_if->if_num = -1;
|
|
batman_if->net_dev = net_dev;
|
|
batman_if->if_status = IF_NOT_IN_USE;
|
|
INIT_LIST_HEAD(&batman_if->list);
|
|
|
|
check_known_mac_addr(batman_if->net_dev->dev_addr);
|
|
list_add_tail_rcu(&batman_if->list, &if_list);
|
|
return batman_if;
|
|
|
|
free_dev:
|
|
kfree(batman_if->dev);
|
|
free_if:
|
|
kfree(batman_if);
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
static void hardif_free_interface(struct rcu_head *rcu)
|
|
{
|
|
struct batman_if *batman_if = container_of(rcu, struct batman_if, rcu);
|
|
|
|
/* delete all references to this batman_if */
|
|
purge_orig(NULL);
|
|
purge_outstanding_packets(batman_if);
|
|
|
|
kfree(batman_if->dev);
|
|
kfree(batman_if);
|
|
}
|
|
|
|
static void hardif_remove_interface(struct batman_if *batman_if)
|
|
{
|
|
/* first deactivate interface */
|
|
if (batman_if->if_status != IF_NOT_IN_USE)
|
|
hardif_disable_interface(batman_if);
|
|
|
|
if (batman_if->if_status != IF_NOT_IN_USE)
|
|
return;
|
|
|
|
batman_if->if_status = IF_TO_BE_REMOVED;
|
|
list_del_rcu(&batman_if->list);
|
|
sysfs_del_hardif(&batman_if->hardif_obj);
|
|
call_rcu(&batman_if->rcu, hardif_free_interface);
|
|
}
|
|
|
|
void hardif_remove_interfaces(void)
|
|
{
|
|
struct batman_if *batman_if, *batman_if_tmp;
|
|
|
|
list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list)
|
|
hardif_remove_interface(batman_if);
|
|
}
|
|
|
|
static int hard_if_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *net_dev = (struct net_device *)ptr;
|
|
struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
|
|
/* FIXME: each batman_if will be attached to a softif */
|
|
struct bat_priv *bat_priv = netdev_priv(soft_device);
|
|
|
|
if (!batman_if)
|
|
batman_if = hardif_add_interface(net_dev);
|
|
|
|
if (!batman_if)
|
|
goto out;
|
|
|
|
switch (event) {
|
|
case NETDEV_REGISTER:
|
|
break;
|
|
case NETDEV_UP:
|
|
hardif_activate_interface(bat_priv, batman_if);
|
|
break;
|
|
case NETDEV_GOING_DOWN:
|
|
case NETDEV_DOWN:
|
|
hardif_deactivate_interface(batman_if);
|
|
break;
|
|
case NETDEV_UNREGISTER:
|
|
hardif_remove_interface(batman_if);
|
|
break;
|
|
case NETDEV_CHANGENAME:
|
|
break;
|
|
case NETDEV_CHANGEADDR:
|
|
check_known_mac_addr(batman_if->net_dev->dev_addr);
|
|
update_mac_addresses(batman_if);
|
|
if (batman_if == bat_priv->primary_if)
|
|
set_primary_if(bat_priv, batman_if);
|
|
break;
|
|
default:
|
|
break;
|
|
};
|
|
|
|
out:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
/* receive a packet with the batman ethertype coming on a hard
|
|
* interface */
|
|
int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *ptype, struct net_device *orig_dev)
|
|
{
|
|
struct batman_packet *batman_packet;
|
|
struct batman_if *batman_if;
|
|
struct net_device_stats *stats;
|
|
int ret;
|
|
|
|
skb = skb_share_check(skb, GFP_ATOMIC);
|
|
|
|
/* skb was released by skb_share_check() */
|
|
if (!skb)
|
|
goto err_out;
|
|
|
|
if (atomic_read(&module_state) != MODULE_ACTIVE)
|
|
goto err_free;
|
|
|
|
/* packet should hold at least type and version */
|
|
if (unlikely(skb_headlen(skb) < 2))
|
|
goto err_free;
|
|
|
|
/* expect a valid ethernet header here. */
|
|
if (unlikely(skb->mac_len != sizeof(struct ethhdr)
|
|
|| !skb_mac_header(skb)))
|
|
goto err_free;
|
|
|
|
batman_if = get_batman_if_by_netdev(skb->dev);
|
|
if (!batman_if)
|
|
goto err_free;
|
|
|
|
/* discard frames on not active interfaces */
|
|
if (batman_if->if_status != IF_ACTIVE)
|
|
goto err_free;
|
|
|
|
stats = (struct net_device_stats *)dev_get_stats(skb->dev);
|
|
if (stats) {
|
|
stats->rx_packets++;
|
|
stats->rx_bytes += skb->len;
|
|
}
|
|
|
|
batman_packet = (struct batman_packet *)skb->data;
|
|
|
|
if (batman_packet->version != COMPAT_VERSION) {
|
|
bat_dbg(DBG_BATMAN,
|
|
"Drop packet: incompatible batman version (%i)\n",
|
|
batman_packet->version);
|
|
goto err_free;
|
|
}
|
|
|
|
/* all receive handlers return whether they received or reused
|
|
* the supplied skb. if not, we have to free the skb. */
|
|
|
|
switch (batman_packet->packet_type) {
|
|
/* batman originator packet */
|
|
case BAT_PACKET:
|
|
ret = recv_bat_packet(skb, batman_if);
|
|
break;
|
|
|
|
/* batman icmp packet */
|
|
case BAT_ICMP:
|
|
ret = recv_icmp_packet(skb);
|
|
break;
|
|
|
|
/* unicast packet */
|
|
case BAT_UNICAST:
|
|
ret = recv_unicast_packet(skb);
|
|
break;
|
|
|
|
/* broadcast packet */
|
|
case BAT_BCAST:
|
|
ret = recv_bcast_packet(skb);
|
|
break;
|
|
|
|
/* vis packet */
|
|
case BAT_VIS:
|
|
ret = recv_vis_packet(skb);
|
|
break;
|
|
default:
|
|
ret = NET_RX_DROP;
|
|
}
|
|
|
|
if (ret == NET_RX_DROP)
|
|
kfree_skb(skb);
|
|
|
|
/* return NET_RX_SUCCESS in any case as we
|
|
* most probably dropped the packet for
|
|
* routing-logical reasons. */
|
|
|
|
return NET_RX_SUCCESS;
|
|
|
|
err_free:
|
|
kfree_skb(skb);
|
|
err_out:
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
|
|
struct notifier_block hard_if_notifier = {
|
|
.notifier_call = hard_if_event,
|
|
};
|