529 lines
13 KiB
C
529 lines
13 KiB
C
/*
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* Copyright (C) 2007-2010 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#include "main.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 "bat_sysfs.h"
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#include "originator.h"
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#include "hash.h"
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#include <linux/if_arp.h>
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev)
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{
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struct batman_if *batman_if;
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rcu_read_lock();
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list_for_each_entry_rcu(batman_if, &if_list, list) {
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if (batman_if->net_dev == net_dev)
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goto out;
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}
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batman_if = NULL;
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out:
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rcu_read_unlock();
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return batman_if;
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}
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static int is_valid_iface(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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#ifdef HAVE_NET_DEVICE_OPS
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if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
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return 0;
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#else
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if (net_dev->hard_start_xmit == interface_tx)
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return 0;
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#endif
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/* Device is being bridged */
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/* if (net_dev->priv_flags & IFF_BRIDGE_PORT)
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return 0; */
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return 1;
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}
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static struct batman_if *get_active_batman_if(void)
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{
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struct batman_if *batman_if;
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/* TODO: should check interfaces belonging to bat_priv */
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rcu_read_lock();
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list_for_each_entry_rcu(batman_if, &if_list, list) {
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if (batman_if->if_status == IF_ACTIVE)
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goto out;
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}
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batman_if = NULL;
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out:
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rcu_read_unlock();
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return batman_if;
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}
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static void set_primary_if(struct bat_priv *bat_priv,
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struct batman_if *batman_if)
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{
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struct batman_packet *batman_packet;
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bat_priv->primary_if = batman_if;
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if (!bat_priv->primary_if)
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return;
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set_main_if_addr(batman_if->net_dev->dev_addr);
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batman_packet = (struct batman_packet *)(batman_if->packet_buff);
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batman_packet->flags = PRIMARIES_FIRST_HOP;
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batman_packet->ttl = TTL;
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/***
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* hacky trick to make sure that we send the HNA information via
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* our new primary interface
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*/
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atomic_set(&hna_local_changed, 1);
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}
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static bool hardif_is_iface_up(struct batman_if *batman_if)
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{
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if (batman_if->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 update_mac_addresses(struct batman_if *batman_if)
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{
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if (!batman_if || !batman_if->packet_buff)
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return;
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addr_to_string(batman_if->addr_str, batman_if->net_dev->dev_addr);
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memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig,
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batman_if->net_dev->dev_addr, ETH_ALEN);
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memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender,
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batman_if->net_dev->dev_addr, ETH_ALEN);
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}
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static void check_known_mac_addr(uint8_t *addr)
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{
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struct batman_if *batman_if;
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rcu_read_lock();
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list_for_each_entry_rcu(batman_if, &if_list, list) {
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if ((batman_if->if_status != IF_ACTIVE) &&
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(batman_if->if_status != IF_TO_BE_ACTIVATED))
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continue;
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if (!compare_orig(batman_if->net_dev->dev_addr, addr))
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continue;
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pr_warning("The newly added mac address (%pM) already exists "
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"on: %s\n", addr, batman_if->dev);
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pr_warning("It is strongly recommended to keep mac addresses "
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"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 hardif_min_mtu(void)
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{
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struct batman_if *batman_if;
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/* allow big frames if all devices are capable to do so
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* (have MTU > 1500 + BAT_HEADER_LEN) */
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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(batman_if, &if_list, list) {
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if ((batman_if->if_status == IF_ACTIVE) ||
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(batman_if->if_status == IF_TO_BE_ACTIVATED))
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min_mtu = MIN(batman_if->net_dev->mtu - BAT_HEADER_LEN,
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min_mtu);
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}
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rcu_read_unlock();
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return min_mtu;
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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 update_min_mtu(void)
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{
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int min_mtu;
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min_mtu = hardif_min_mtu();
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if (soft_device->mtu != min_mtu)
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soft_device->mtu = min_mtu;
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}
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static void hardif_activate_interface(struct net_device *net_dev,
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struct bat_priv *bat_priv,
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struct batman_if *batman_if)
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{
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if (batman_if->if_status != IF_INACTIVE)
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return;
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update_mac_addresses(batman_if);
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batman_if->if_status = IF_TO_BE_ACTIVATED;
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/**
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* the first active interface becomes our primary interface or
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* the next active interface after the old primay interface was removed
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*/
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if (!bat_priv->primary_if)
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set_primary_if(bat_priv, batman_if);
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bat_info(net_dev, "Interface activated: %s\n", batman_if->dev);
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if (atomic_read(&module_state) == MODULE_INACTIVE)
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activate_module();
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update_min_mtu();
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return;
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}
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static void hardif_deactivate_interface(struct net_device *net_dev,
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struct batman_if *batman_if)
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{
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if ((batman_if->if_status != IF_ACTIVE) &&
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(batman_if->if_status != IF_TO_BE_ACTIVATED))
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return;
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batman_if->if_status = IF_INACTIVE;
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bat_info(net_dev, "Interface deactivated: %s\n", batman_if->dev);
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update_min_mtu();
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}
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int hardif_enable_interface(struct batman_if *batman_if)
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{
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/* FIXME: each batman_if will be attached to a softif */
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struct bat_priv *bat_priv = netdev_priv(soft_device);
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struct batman_packet *batman_packet;
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if (batman_if->if_status != IF_NOT_IN_USE)
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goto out;
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batman_if->packet_len = BAT_PACKET_LEN;
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batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_ATOMIC);
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if (!batman_if->packet_buff) {
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bat_err(soft_device, "Can't add interface packet (%s): "
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"out of memory\n", batman_if->dev);
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goto err;
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}
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batman_packet = (struct batman_packet *)(batman_if->packet_buff);
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batman_packet->packet_type = BAT_PACKET;
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batman_packet->version = COMPAT_VERSION;
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batman_packet->flags = 0;
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batman_packet->ttl = 2;
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batman_packet->tq = TQ_MAX_VALUE;
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batman_packet->num_hna = 0;
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batman_if->if_num = bat_priv->num_ifaces;
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bat_priv->num_ifaces++;
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batman_if->if_status = IF_INACTIVE;
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orig_hash_add_if(batman_if, bat_priv->num_ifaces);
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atomic_set(&batman_if->seqno, 1);
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bat_info(soft_device, "Adding interface: %s\n", batman_if->dev);
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if (hardif_is_iface_up(batman_if))
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hardif_activate_interface(soft_device, bat_priv, batman_if);
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else
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bat_err(soft_device, "Not using interface %s "
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"(retrying later): interface not active\n",
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batman_if->dev);
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/* begin scheduling originator messages on that interface */
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schedule_own_packet(batman_if);
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out:
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return 0;
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err:
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return -ENOMEM;
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}
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void hardif_disable_interface(struct batman_if *batman_if)
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{
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/* FIXME: each batman_if will be attached to a softif */
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struct bat_priv *bat_priv = netdev_priv(soft_device);
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if (batman_if->if_status == IF_ACTIVE)
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hardif_deactivate_interface(soft_device, batman_if);
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if (batman_if->if_status != IF_INACTIVE)
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return;
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bat_info(soft_device, "Removing interface: %s\n", batman_if->dev);
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bat_priv->num_ifaces--;
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orig_hash_del_if(batman_if, bat_priv->num_ifaces);
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if (batman_if == bat_priv->primary_if)
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set_primary_if(bat_priv, get_active_batman_if());
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kfree(batman_if->packet_buff);
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batman_if->packet_buff = NULL;
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batman_if->if_status = IF_NOT_IN_USE;
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if ((atomic_read(&module_state) == MODULE_ACTIVE) &&
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(bat_priv->num_ifaces == 0))
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deactivate_module();
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}
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static struct batman_if *hardif_add_interface(struct net_device *net_dev)
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{
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struct batman_if *batman_if;
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int ret;
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ret = is_valid_iface(net_dev);
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if (ret != 1)
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goto out;
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dev_hold(net_dev);
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batman_if = kmalloc(sizeof(struct batman_if), GFP_ATOMIC);
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if (!batman_if) {
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pr_err("Can't add interface (%s): out of memory\n",
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net_dev->name);
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goto release_dev;
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}
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batman_if->dev = kstrdup(net_dev->name, GFP_ATOMIC);
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if (!batman_if->dev)
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goto free_if;
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ret = sysfs_add_hardif(&batman_if->hardif_obj, net_dev);
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if (ret)
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goto free_dev;
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batman_if->if_num = -1;
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batman_if->net_dev = net_dev;
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batman_if->if_status = IF_NOT_IN_USE;
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batman_if->packet_buff = NULL;
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INIT_LIST_HEAD(&batman_if->list);
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check_known_mac_addr(batman_if->net_dev->dev_addr);
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list_add_tail_rcu(&batman_if->list, &if_list);
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return batman_if;
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free_dev:
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kfree(batman_if->dev);
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free_if:
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kfree(batman_if);
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release_dev:
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dev_put(net_dev);
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out:
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return NULL;
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}
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static void hardif_free_interface(struct rcu_head *rcu)
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{
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struct batman_if *batman_if = container_of(rcu, struct batman_if, rcu);
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/* delete all references to this batman_if */
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purge_orig(NULL);
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purge_outstanding_packets(batman_if);
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kfree(batman_if->dev);
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kfree(batman_if);
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}
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static void hardif_remove_interface(struct batman_if *batman_if)
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{
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/* first deactivate interface */
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if (batman_if->if_status != IF_NOT_IN_USE)
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hardif_disable_interface(batman_if);
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if (batman_if->if_status != IF_NOT_IN_USE)
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return;
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batman_if->if_status = IF_TO_BE_REMOVED;
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list_del_rcu(&batman_if->list);
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sysfs_del_hardif(&batman_if->hardif_obj);
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dev_put(batman_if->net_dev);
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call_rcu(&batman_if->rcu, hardif_free_interface);
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}
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void hardif_remove_interfaces(void)
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{
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struct batman_if *batman_if, *batman_if_tmp;
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list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list)
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hardif_remove_interface(batman_if);
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}
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static int hard_if_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct net_device *net_dev = (struct net_device *)ptr;
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struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
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/* FIXME: each batman_if will be attached to a softif */
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struct bat_priv *bat_priv = netdev_priv(soft_device);
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if (!batman_if && event == NETDEV_REGISTER)
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batman_if = hardif_add_interface(net_dev);
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if (!batman_if)
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goto out;
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switch (event) {
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case NETDEV_UP:
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hardif_activate_interface(soft_device, bat_priv, batman_if);
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break;
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case NETDEV_GOING_DOWN:
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case NETDEV_DOWN:
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hardif_deactivate_interface(soft_device, batman_if);
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break;
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case NETDEV_UNREGISTER:
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hardif_remove_interface(batman_if);
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break;
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case NETDEV_CHANGENAME:
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break;
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case NETDEV_CHANGEADDR:
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check_known_mac_addr(batman_if->net_dev->dev_addr);
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update_mac_addresses(batman_if);
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if (batman_if == bat_priv->primary_if)
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set_primary_if(bat_priv, batman_if);
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break;
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default:
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break;
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};
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out:
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return NOTIFY_DONE;
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}
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/* receive a packet with the batman ethertype coming on a hard
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* interface */
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int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *ptype, struct net_device *orig_dev)
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{
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/* FIXME: each orig_node->batman_if will be attached to a softif */
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struct bat_priv *bat_priv = netdev_priv(soft_device);
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struct batman_packet *batman_packet;
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struct batman_if *batman_if;
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int ret;
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skb = skb_share_check(skb, GFP_ATOMIC);
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/* skb was released by skb_share_check() */
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if (!skb)
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goto err_out;
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if (atomic_read(&module_state) != MODULE_ACTIVE)
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goto err_free;
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/* packet should hold at least type and version */
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if (unlikely(skb_headlen(skb) < 2))
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goto err_free;
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/* expect a valid ethernet header here. */
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if (unlikely(skb->mac_len != sizeof(struct ethhdr)
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|| !skb_mac_header(skb)))
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goto err_free;
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batman_if = get_batman_if_by_netdev(skb->dev);
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if (!batman_if)
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goto err_free;
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/* discard frames on not active interfaces */
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if (batman_if->if_status != IF_ACTIVE)
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goto err_free;
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batman_packet = (struct batman_packet *)skb->data;
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if (batman_packet->version != COMPAT_VERSION) {
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bat_dbg(DBG_BATMAN, bat_priv,
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"Drop packet: incompatible batman version (%i)\n",
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batman_packet->version);
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goto err_free;
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}
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/* all receive handlers return whether they received or reused
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* the supplied skb. if not, we have to free the skb. */
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switch (batman_packet->packet_type) {
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/* batman originator packet */
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case BAT_PACKET:
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ret = recv_bat_packet(skb, batman_if);
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break;
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/* batman icmp packet */
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case BAT_ICMP:
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ret = recv_icmp_packet(skb);
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break;
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/* unicast packet */
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case BAT_UNICAST:
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ret = recv_unicast_packet(skb, batman_if);
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break;
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/* broadcast packet */
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case BAT_BCAST:
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ret = recv_bcast_packet(skb);
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break;
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/* vis packet */
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case BAT_VIS:
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ret = recv_vis_packet(skb);
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break;
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default:
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ret = NET_RX_DROP;
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}
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if (ret == NET_RX_DROP)
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kfree_skb(skb);
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/* return NET_RX_SUCCESS in any case as we
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* most probably dropped the packet for
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* routing-logical reasons. */
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return NET_RX_SUCCESS;
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err_free:
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kfree_skb(skb);
|
|
err_out:
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
struct notifier_block hard_if_notifier = {
|
|
.notifier_call = hard_if_event,
|
|
};
|