521 lines
12 KiB
C
521 lines
12 KiB
C
/*
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* Copyright (C) 2007-2009 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 "hash.h"
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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static char avail_ifs;
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static char active_ifs;
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static void hardif_free_interface(struct rcu_head *rcu);
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static struct batman_if *get_batman_if_by_name(char *name)
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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 (strncmp(batman_if->dev, name, IFNAMSIZ) == 0)
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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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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_active == IF_ACTIVE) ||
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(batman_if->if_active == 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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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_active != IF_ACTIVE) &&
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(batman_if->if_active != 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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printk(KERN_WARNING "batman-adv:The newly added mac address (%pM) already exists on: %s\n",
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addr, batman_if->dev);
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printk(KERN_WARNING "batman-adv:It is strongly recommended to keep mac addresses unique to avoid problems!\n");
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}
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rcu_read_unlock();
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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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/* checks if the interface is up. (returns 1 if it is) */
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static int hardif_is_interface_up(char *dev)
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{
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struct net_device *net_dev;
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/**
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* if we already have an interface in our interface list and
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* the current interface is not the primary interface and
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* the primary interface is not up and
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* the primary interface has never been up - don't activate any
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* secondary interface !
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*/
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rcu_read_lock();
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if ((!list_empty(&if_list)) &&
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strncmp(((struct batman_if *)if_list.next)->dev, dev, IFNAMSIZ) &&
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!(((struct batman_if *)if_list.next)->if_active == IF_ACTIVE) &&
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!(((struct batman_if *)if_list.next)->if_active == IF_TO_BE_ACTIVATED) &&
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(!main_if_was_up())) {
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rcu_read_unlock();
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goto end;
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}
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rcu_read_unlock();
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#ifdef __NET_NET_NAMESPACE_H
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net_dev = dev_get_by_name(&init_net, dev);
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#else
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net_dev = dev_get_by_name(dev);
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#endif
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if (!net_dev)
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goto end;
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if (!(net_dev->flags & IFF_UP))
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goto failure;
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dev_put(net_dev);
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return 1;
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failure:
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dev_put(net_dev);
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end:
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return 0;
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}
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/* deactivates the interface. */
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void hardif_deactivate_interface(struct batman_if *batman_if)
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{
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if (batman_if->if_active != IF_ACTIVE)
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return;
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/**
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* batman_if->net_dev has been acquired by dev_get_by_name() in
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* proc_interfaces_write() and has to be unreferenced.
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*/
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if (batman_if->net_dev)
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dev_put(batman_if->net_dev);
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batman_if->if_active = IF_INACTIVE;
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active_ifs--;
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printk(KERN_INFO "batman-adv:Interface deactivated: %s\n",
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batman_if->dev);
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}
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/* (re)activate given interface. */
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static void hardif_activate_interface(struct batman_if *batman_if)
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{
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if (batman_if->if_active != IF_INACTIVE)
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return;
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#ifdef __NET_NET_NAMESPACE_H
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batman_if->net_dev = dev_get_by_name(&init_net, batman_if->dev);
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#else
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batman_if->net_dev = dev_get_by_name(batman_if->dev);
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#endif
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if (!batman_if->net_dev)
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goto dev_err;
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check_known_mac_addr(batman_if->net_dev->dev_addr);
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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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batman_if->if_active = IF_TO_BE_ACTIVATED;
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active_ifs++;
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/* save the mac address if it is our primary interface */
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if (batman_if->if_num == 0)
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set_main_if_addr(batman_if->net_dev->dev_addr);
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printk(KERN_INFO "batman-adv:Interface activated: %s\n",
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batman_if->dev);
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return;
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dev_err:
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batman_if->net_dev = 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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kfree(batman_if->packet_buff);
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kfree(batman_if->dev);
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kfree(batman_if);
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}
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/**
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* called by
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* - echo '' > /proc/.../interfaces
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* - modprobe -r batman-adv-core
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*/
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/* removes and frees all interfaces */
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void hardif_remove_interfaces(void)
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{
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struct batman_if *batman_if = NULL;
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avail_ifs = 0;
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/* no lock needed - we don't delete somewhere else */
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list_for_each_entry(batman_if, &if_list, list) {
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list_del_rcu(&batman_if->list);
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/* first deactivate interface */
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if (batman_if->if_active != IF_INACTIVE)
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hardif_deactivate_interface(batman_if);
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call_rcu(&batman_if->rcu, hardif_free_interface);
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}
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}
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static int resize_orig(struct orig_node *orig_node, int if_num)
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{
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void *data_ptr;
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data_ptr = kmalloc((if_num + 1) * sizeof(TYPE_OF_WORD) * NUM_WORDS,
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GFP_ATOMIC);
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if (!data_ptr) {
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printk(KERN_ERR "batman-adv:Can't resize orig: out of memory\n");
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return -1;
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}
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memcpy(data_ptr, orig_node->bcast_own,
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if_num * sizeof(TYPE_OF_WORD) * NUM_WORDS);
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kfree(orig_node->bcast_own);
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orig_node->bcast_own = data_ptr;
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data_ptr = kmalloc((if_num + 1) * sizeof(uint8_t), GFP_ATOMIC);
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if (!data_ptr) {
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printk(KERN_ERR "batman-adv:Can't resize orig: out of memory\n");
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return -1;
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}
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memcpy(data_ptr, orig_node->bcast_own_sum, if_num * sizeof(uint8_t));
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kfree(orig_node->bcast_own_sum);
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orig_node->bcast_own_sum = data_ptr;
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return 0;
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}
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/* adds an interface the interface list and activate it, if possible */
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int hardif_add_interface(char *dev, int if_num)
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{
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struct batman_if *batman_if;
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struct batman_packet *batman_packet;
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struct orig_node *orig_node;
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unsigned long flags;
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HASHIT(hashit);
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batman_if = kmalloc(sizeof(struct batman_if), GFP_KERNEL);
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if (!batman_if) {
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printk(KERN_ERR "batman-adv:Can't add interface (%s): out of memory\n", dev);
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return -1;
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}
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batman_if->net_dev = NULL;
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if ((if_num == 0) && (num_hna > 0))
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batman_if->packet_len = BAT_PACKET_LEN + num_hna * ETH_ALEN;
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else
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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_KERNEL);
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if (!batman_if->packet_buff) {
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printk(KERN_ERR "batman-adv:Can't add interface packet (%s): out of memory\n", dev);
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goto out;
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}
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batman_if->if_num = if_num;
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batman_if->dev = dev;
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batman_if->if_active = IF_INACTIVE;
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INIT_RCU_HEAD(&batman_if->rcu);
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printk(KERN_INFO "batman-adv:Adding interface: %s\n", dev);
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avail_ifs++;
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INIT_LIST_HEAD(&batman_if->list);
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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 = 0x00;
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batman_packet->ttl = (batman_if->if_num > 0 ? 2 : TTL);
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batman_packet->flags = 0;
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batman_packet->tq = TQ_MAX_VALUE;
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batman_packet->num_hna = 0;
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if (batman_if->packet_len != BAT_PACKET_LEN) {
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unsigned char *hna_buff;
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int hna_len;
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hna_buff = batman_if->packet_buff + BAT_PACKET_LEN;
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hna_len = batman_if->packet_len - BAT_PACKET_LEN;
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batman_packet->num_hna = hna_local_fill_buffer(hna_buff,
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hna_len);
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}
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atomic_set(&batman_if->seqno, 1);
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/* resize all orig nodes because orig_node->bcast_own(_sum) depend on
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* if_num */
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spin_lock_irqsave(&orig_hash_lock, flags);
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while (hash_iterate(orig_hash, &hashit)) {
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orig_node = hashit.bucket->data;
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if (resize_orig(orig_node, if_num) == -1) {
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spin_unlock_irqrestore(&orig_hash_lock, flags);
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goto out;
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}
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}
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spin_unlock_irqrestore(&orig_hash_lock, flags);
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if (!hardif_is_interface_up(batman_if->dev))
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printk(KERN_ERR "batman-adv:Not using interface %s (retrying later): interface not active\n", batman_if->dev);
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else
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hardif_activate_interface(batman_if);
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list_add_tail_rcu(&batman_if->list, &if_list);
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/* begin sending originator messages on that interface */
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schedule_own_packet(batman_if);
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return 1;
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out:
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kfree(batman_if->packet_buff);
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kfree(batman_if);
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kfree(dev);
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return -1;
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}
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char hardif_get_active_if_num(void)
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{
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return active_ifs;
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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 *dev = (struct net_device *)ptr;
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struct batman_if *batman_if = get_batman_if_by_name(dev->name);
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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_GOING_DOWN:
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case NETDEV_DOWN:
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case NETDEV_UNREGISTER:
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hardif_deactivate_interface(batman_if);
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break;
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case NETDEV_UP:
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hardif_activate_interface(batman_if);
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if ((atomic_read(&module_state) == MODULE_INACTIVE) &&
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(hardif_get_active_if_num() > 0)) {
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activate_module();
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}
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break;
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/* NETDEV_CHANGEADDR - mac address change - what are we doing here ? */
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default:
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break;
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};
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update_min_mtu();
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out:
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return NOTIFY_DONE;
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}
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/* find batman interface by netdev. assumes rcu_read_lock on */
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static struct batman_if *find_batman_if(struct net_device *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 == dev) {
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rcu_read_unlock();
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return batman_if;
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}
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}
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rcu_read_unlock();
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return NULL;
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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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struct batman_packet *batman_packet;
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struct batman_if *batman_if;
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struct net_device_stats *stats;
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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 = find_batman_if(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_active != IF_ACTIVE)
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goto err_free;
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stats = (struct net_device_stats *)dev_get_stats(skb->dev);
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if (stats) {
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stats->rx_packets++;
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stats->rx_bytes += skb->len;
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}
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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,
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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);
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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);
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err_out:
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return NET_RX_DROP;
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}
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struct notifier_block hard_if_notifier = {
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.notifier_call = hard_if_event,
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};
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