+++ /dev/null
-/*
- * 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->priv_flags & IFF_BRIDGE_PORT)
- 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 = PRIMARIES_FIRST_HOP;
- 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)
-{
- if (!batman_if || !batman_if->packet_buff)
- return;
-
- 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;
-
- pr_warning("The newly added mac address (%pM) already exists "
- "on: %s\n", addr, batman_if->dev);
- pr_warning("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 net_device *net_dev,
- struct bat_priv *bat_priv,
- struct batman_if *batman_if)
-{
- if (batman_if->if_status != IF_INACTIVE)
- return;
-
- 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);
-
- bat_info(net_dev, "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 net_device *net_dev,
- struct batman_if *batman_if)
-{
- if ((batman_if->if_status != IF_ACTIVE) &&
- (batman_if->if_status != IF_TO_BE_ACTIVATED))
- return;
-
- batman_if->if_status = IF_INACTIVE;
-
- bat_info(net_dev, "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) {
- bat_err(soft_device, "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);
- bat_info(soft_device, "Adding interface: %s\n", batman_if->dev);
-
- if (hardif_is_iface_up(batman_if))
- hardif_activate_interface(soft_device, bat_priv, batman_if);
- else
- bat_err(soft_device, "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(soft_device, batman_if);
-
- if (batman_if->if_status != IF_INACTIVE)
- return;
-
- bat_info(soft_device, "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;
-
- dev_hold(net_dev);
-
- batman_if = kmalloc(sizeof(struct batman_if), GFP_ATOMIC);
- if (!batman_if) {
- pr_err("Can't add interface (%s): out of memory\n",
- net_dev->name);
- goto release_dev;
- }
-
- 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;
- batman_if->packet_buff = NULL;
- 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);
-release_dev:
- dev_put(net_dev);
-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);
- dev_put(batman_if->net_dev);
- 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 && event == NETDEV_REGISTER)
- batman_if = hardif_add_interface(net_dev);
-
- if (!batman_if)
- goto out;
-
- switch (event) {
- case NETDEV_UP:
- hardif_activate_interface(soft_device, bat_priv, batman_if);
- break;
- case NETDEV_GOING_DOWN:
- case NETDEV_DOWN:
- hardif_deactivate_interface(soft_device, 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)
-{
- /* FIXME: each orig_node->batman_if will be attached to a softif */
- struct bat_priv *bat_priv = netdev_priv(soft_device);
- struct batman_packet *batman_packet;
- struct batman_if *batman_if;
- 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;
-
- batman_packet = (struct batman_packet *)skb->data;
-
- if (batman_packet->version != COMPAT_VERSION) {
- bat_dbg(DBG_BATMAN, bat_priv,
- "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, batman_if);
- 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,
-};
projects / mv-sheeva.git / blobdiff