blob: 5ce2007ea11b355ead540bce9e05e57a814e2ebe [file] [log] [blame]
Sven Eckelmann7db7d9f2017-11-19 15:05:11 +01001// SPDX-License-Identifier: GPL-2.0
Sven Eckelmannac79cbb2017-01-01 00:00:00 +01002/* Copyright (C) 2007-2017 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00003 *
4 * Marek Lindner, Simon Wunderlich
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
Antonio Quartulliebf38fb2013-11-03 20:40:48 +010016 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000017 */
18
19#include "main.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020020
21#include <linux/atomic.h>
22#include <linux/bug.h>
23#include <linux/byteorder/generic.h>
24#include <linux/crc32c.h>
25#include <linux/errno.h>
26#include <linux/fs.h>
Sven Eckelmann2c0c06f2016-10-29 13:56:23 +020027#include <linux/genetlink.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020028#include <linux/if_ether.h>
29#include <linux/if_vlan.h>
30#include <linux/init.h>
31#include <linux/ip.h>
32#include <linux/ipv6.h>
33#include <linux/kernel.h>
Sven Eckelmannf7157dd2016-01-16 10:29:48 +010034#include <linux/kref.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020035#include <linux/list.h>
36#include <linux/module.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020037#include <linux/netdevice.h>
Sven Eckelmannba412082016-05-15 23:48:31 +020038#include <linux/printk.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020039#include <linux/rculist.h>
40#include <linux/rcupdate.h>
41#include <linux/seq_file.h>
42#include <linux/skbuff.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020043#include <linux/spinlock.h>
44#include <linux/stddef.h>
45#include <linux/string.h>
46#include <linux/workqueue.h>
47#include <net/dsfield.h>
48#include <net/rtnetlink.h>
Sven Eckelmann2c0c06f2016-10-29 13:56:23 +020049#include <uapi/linux/batman_adv.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020050
51#include "bat_algo.h"
Sven Eckelmanna2d08162016-05-15 11:07:46 +020052#include "bat_iv_ogm.h"
53#include "bat_v.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020054#include "bridge_loop_avoidance.h"
Sven Eckelmannb706b132012-06-10 23:58:51 +020055#include "debugfs.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020056#include "distributed-arp-table.h"
57#include "gateway_client.h"
58#include "gateway_common.h"
59#include "hard-interface.h"
60#include "icmp_socket.h"
Sven Eckelmannba412082016-05-15 23:48:31 +020061#include "log.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020062#include "multicast.h"
Matthias Schiffer09748a22016-05-09 18:41:08 +020063#include "netlink.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020064#include "network-coding.h"
65#include "originator.h"
66#include "packet.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000067#include "routing.h"
68#include "send.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000069#include "soft-interface.h"
Antonio Quartulli33a3bb42016-05-05 13:09:43 +020070#include "tp_meter.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000071#include "translation-table.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000072
Sven Eckelmannc3caf512011-05-03 11:51:38 +020073/* List manipulations on hardif_list have to be rtnl_lock()'ed,
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +020074 * list traversals just rcu-locked
75 */
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020076struct list_head batadv_hardif_list;
Sven Eckelmann706cc9f2017-09-30 09:24:28 +020077static int (*batadv_rx_handler[256])(struct sk_buff *skb,
78 struct batadv_hard_iface *recv_if);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000079
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020080unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000081
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020082struct workqueue_struct *batadv_event_workqueue;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000083
Sven Eckelmannee11ad62012-05-16 20:23:19 +020084static void batadv_recv_handler_init(void);
Marek Lindnerffa995e2012-03-01 15:35:17 +080085
Sven Eckelmannee11ad62012-05-16 20:23:19 +020086static int __init batadv_init(void)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000087{
Sven Eckelmann86452f82016-06-25 16:44:06 +020088 int ret;
89
90 ret = batadv_tt_cache_init();
91 if (ret < 0)
92 return ret;
93
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020094 INIT_LIST_HEAD(&batadv_hardif_list);
Sven Eckelmann01d350d2016-05-15 11:07:44 +020095 batadv_algo_init();
Marek Lindner1c280472011-11-28 17:40:17 +080096
Sven Eckelmannee11ad62012-05-16 20:23:19 +020097 batadv_recv_handler_init();
Marek Lindnerffa995e2012-03-01 15:35:17 +080098
Linus Luessingd6f94d92016-01-16 16:40:09 +080099 batadv_v_init();
Sven Eckelmann81c524f2012-05-12 02:09:22 +0200100 batadv_iv_init();
Matthias Schiffer6c519ba2013-09-27 18:03:39 +0200101 batadv_nc_init();
Antonio Quartulli33a3bb42016-05-05 13:09:43 +0200102 batadv_tp_meter_init();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000103
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200104 batadv_event_workqueue = create_singlethread_workqueue("bat_events");
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200105 if (!batadv_event_workqueue)
Sven Eckelmann86452f82016-06-25 16:44:06 +0200106 goto err_create_wq;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000107
Sven Eckelmann9039dc72012-05-12 02:09:33 +0200108 batadv_socket_init();
Sven Eckelmann40a072d2012-05-12 02:09:23 +0200109 batadv_debugfs_init();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000110
Sven Eckelmann95638772012-05-12 02:09:31 +0200111 register_netdevice_notifier(&batadv_hard_if_notifier);
Sven Eckelmanna4ac28c2013-02-11 17:10:26 +0800112 rtnl_link_register(&batadv_link_ops);
Matthias Schiffer09748a22016-05-09 18:41:08 +0200113 batadv_netlink_register();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000114
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100115 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200116 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000117
118 return 0;
Sven Eckelmann86452f82016-06-25 16:44:06 +0200119
120err_create_wq:
121 batadv_tt_cache_destroy();
122
123 return -ENOMEM;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000124}
125
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200126static void __exit batadv_exit(void)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000127{
Sven Eckelmann40a072d2012-05-12 02:09:23 +0200128 batadv_debugfs_destroy();
Matthias Schiffer09748a22016-05-09 18:41:08 +0200129 batadv_netlink_unregister();
Sven Eckelmanna4ac28c2013-02-11 17:10:26 +0800130 rtnl_link_unregister(&batadv_link_ops);
Sven Eckelmann95638772012-05-12 02:09:31 +0200131 unregister_netdevice_notifier(&batadv_hard_if_notifier);
132 batadv_hardif_remove_interfaces();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000133
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200134 flush_workqueue(batadv_event_workqueue);
135 destroy_workqueue(batadv_event_workqueue);
136 batadv_event_workqueue = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000137
138 rcu_barrier();
Sven Eckelmann86452f82016-06-25 16:44:06 +0200139
140 batadv_tt_cache_destroy();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000141}
142
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200143int batadv_mesh_init(struct net_device *soft_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000144{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200145 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200146 int ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000147
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000148 spin_lock_init(&bat_priv->forw_bat_list_lock);
149 spin_lock_init(&bat_priv->forw_bcast_list_lock);
Sven Eckelmann807736f2012-07-15 22:26:51 +0200150 spin_lock_init(&bat_priv->tt.changes_list_lock);
151 spin_lock_init(&bat_priv->tt.req_list_lock);
152 spin_lock_init(&bat_priv->tt.roam_list_lock);
153 spin_lock_init(&bat_priv->tt.last_changeset_lock);
Antonio Quartullia70a9aa2013-07-30 22:16:24 +0200154 spin_lock_init(&bat_priv->tt.commit_lock);
Sven Eckelmann807736f2012-07-15 22:26:51 +0200155 spin_lock_init(&bat_priv->gw.list_lock);
Linus LĂĽssingab498862014-02-15 17:47:53 +0100156#ifdef CONFIG_BATMAN_ADV_MCAST
157 spin_lock_init(&bat_priv->mcast.want_lists_lock);
158#endif
Marek Lindneref261572013-04-23 21:39:57 +0800159 spin_lock_init(&bat_priv->tvlv.container_list_lock);
160 spin_lock_init(&bat_priv->tvlv.handler_list_lock);
Antonio Quartulli5d2c05b2013-07-02 11:04:34 +0200161 spin_lock_init(&bat_priv->softif_vlan_list_lock);
Antonio Quartulli33a3bb42016-05-05 13:09:43 +0200162 spin_lock_init(&bat_priv->tp_list_lock);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000163
164 INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
165 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
Sven Eckelmann70ea5ce2016-07-27 12:31:08 +0200166 INIT_HLIST_HEAD(&bat_priv->gw.gateway_list);
Linus LĂĽssingab498862014-02-15 17:47:53 +0100167#ifdef CONFIG_BATMAN_ADV_MCAST
168 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
Linus LĂĽssing4c8755d2014-02-15 17:47:54 +0100169 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list);
170 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list);
Linus LĂĽssingab498862014-02-15 17:47:53 +0100171#endif
Sven Eckelmann807736f2012-07-15 22:26:51 +0200172 INIT_LIST_HEAD(&bat_priv->tt.changes_list);
Marek Lindner7c26a532015-06-28 22:16:06 +0800173 INIT_HLIST_HEAD(&bat_priv->tt.req_list);
Sven Eckelmann807736f2012-07-15 22:26:51 +0200174 INIT_LIST_HEAD(&bat_priv->tt.roam_list);
Linus LĂĽssingc5caf4e2014-02-15 17:47:49 +0100175#ifdef CONFIG_BATMAN_ADV_MCAST
176 INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
177#endif
Marek Lindneref261572013-04-23 21:39:57 +0800178 INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
179 INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
Antonio Quartulli5d2c05b2013-07-02 11:04:34 +0200180 INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
Antonio Quartulli33a3bb42016-05-05 13:09:43 +0200181 INIT_HLIST_HEAD(&bat_priv->tp_list);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000182
Antonio Quartulli0da00352016-01-16 16:40:12 +0800183 ret = batadv_v_mesh_init(bat_priv);
184 if (ret < 0)
185 goto err;
186
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200187 ret = batadv_originator_init(bat_priv);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200188 if (ret < 0)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000189 goto err;
190
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200191 ret = batadv_tt_init(bat_priv);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200192 if (ret < 0)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000193 goto err;
194
Sven Eckelmann08adf152012-05-12 13:38:47 +0200195 ret = batadv_bla_init(bat_priv);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200196 if (ret < 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100197 goto err;
198
Antonio Quartulli2f1dfbe2012-06-30 20:01:19 +0200199 ret = batadv_dat_init(bat_priv);
200 if (ret < 0)
201 goto err;
202
Matthias Schiffer6c519ba2013-09-27 18:03:39 +0200203 ret = batadv_nc_mesh_init(bat_priv);
Martin Hundebølld353d8d2013-01-25 11:12:38 +0100204 if (ret < 0)
205 goto err;
206
Marek Lindner414254e2013-04-23 21:39:58 +0800207 batadv_gw_init(bat_priv);
Linus LĂĽssing60432d72014-02-15 17:47:51 +0100208 batadv_mcast_init(bat_priv);
Marek Lindner414254e2013-04-23 21:39:58 +0800209
Sven Eckelmann807736f2012-07-15 22:26:51 +0200210 atomic_set(&bat_priv->gw.reselect, 0);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200211 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200212
213 return 0;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000214
215err:
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200216 batadv_mesh_free(soft_iface);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200217 return ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000218}
219
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200220void batadv_mesh_free(struct net_device *soft_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000221{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200222 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000223
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200224 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000225
Sven Eckelmann9455e342012-05-12 02:09:37 +0200226 batadv_purge_outstanding_packets(bat_priv, NULL);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000227
Simon Wunderlichbd3524c2015-08-03 19:13:58 +0200228 batadv_gw_node_free(bat_priv);
Antonio Quartulli0da00352016-01-16 16:40:12 +0800229
230 batadv_v_mesh_free(bat_priv);
Matthias Schiffer6c519ba2013-09-27 18:03:39 +0200231 batadv_nc_mesh_free(bat_priv);
Antonio Quartullia4361862013-05-07 01:06:18 +0200232 batadv_dat_free(bat_priv);
Sven Eckelmann08adf152012-05-12 13:38:47 +0200233 batadv_bla_free(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +0100234
Linus LĂĽssingc5caf4e2014-02-15 17:47:49 +0100235 batadv_mcast_free(bat_priv);
236
Antonio Quartullia4361862013-05-07 01:06:18 +0200237 /* Free the TT and the originator tables only after having terminated
238 * all the other depending components which may use these structures for
239 * their purposes.
240 */
241 batadv_tt_free(bat_priv);
242
243 /* Since the originator table clean up routine is accessing the TT
244 * tables as well, it has to be invoked after the TT tables have been
245 * freed and marked as empty. This ensures that no cleanup RCU callbacks
246 * accessing the TT data are scheduled for later execution.
247 */
248 batadv_originator_free(bat_priv);
Antonio Quartulli2f1dfbe2012-06-30 20:01:19 +0200249
Marek Lindner414254e2013-04-23 21:39:58 +0800250 batadv_gw_free(bat_priv);
251
Martin Hundebøllf8214862012-04-20 17:02:45 +0200252 free_percpu(bat_priv->bat_counters);
Martin Hundebøllf69ae772013-04-17 21:13:16 +0200253 bat_priv->bat_counters = NULL;
Martin Hundebøllf8214862012-04-20 17:02:45 +0200254
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200255 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000256}
257
David S. Miller6e0895c2013-04-22 20:32:51 -0400258/**
259 * batadv_is_my_mac - check if the given mac address belongs to any of the real
260 * interfaces in the current mesh
261 * @bat_priv: the bat priv with all the soft interface information
262 * @addr: the address to check
Markus Pargmanne8ad3b12014-12-26 12:41:38 +0100263 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200264 * Return: 'true' if the mac address was found, false otherwise.
David S. Miller6e0895c2013-04-22 20:32:51 -0400265 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200266bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000267{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200268 const struct batadv_hard_iface *hard_iface;
Markus Pargmanne8ad3b12014-12-26 12:41:38 +0100269 bool is_my_mac = false;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000270
271 rcu_read_lock();
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200272 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200273 if (hard_iface->if_status != BATADV_IF_ACTIVE)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000274 continue;
275
Antonio Quartullife8a93b2013-04-03 19:10:26 +0200276 if (hard_iface->soft_iface != bat_priv->soft_iface)
277 continue;
278
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200279 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
Markus Pargmanne8ad3b12014-12-26 12:41:38 +0100280 is_my_mac = true;
281 break;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000282 }
283 }
284 rcu_read_unlock();
Markus Pargmanne8ad3b12014-12-26 12:41:38 +0100285 return is_my_mac;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000286}
287
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +0200288#ifdef CONFIG_BATMAN_ADV_DEBUGFS
Marek Lindner30da63a2012-08-03 17:15:46 +0200289/**
290 * batadv_seq_print_text_primary_if_get - called from debugfs table printing
291 * function that requires the primary interface
292 * @seq: debugfs table seq_file struct
293 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200294 * Return: primary interface if found or NULL otherwise.
Marek Lindner30da63a2012-08-03 17:15:46 +0200295 */
296struct batadv_hard_iface *
297batadv_seq_print_text_primary_if_get(struct seq_file *seq)
298{
299 struct net_device *net_dev = (struct net_device *)seq->private;
300 struct batadv_priv *bat_priv = netdev_priv(net_dev);
301 struct batadv_hard_iface *primary_if;
302
303 primary_if = batadv_primary_if_get_selected(bat_priv);
304
305 if (!primary_if) {
306 seq_printf(seq,
307 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
308 net_dev->name);
309 goto out;
310 }
311
312 if (primary_if->if_status == BATADV_IF_ACTIVE)
313 goto out;
314
315 seq_printf(seq,
316 "BATMAN mesh %s disabled - primary interface not active\n",
317 net_dev->name);
Sven Eckelmann82047ad2016-01-17 11:01:10 +0100318 batadv_hardif_put(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +0200319 primary_if = NULL;
320
321out:
322 return primary_if;
323}
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +0200324#endif
Marek Lindner30da63a2012-08-03 17:15:46 +0200325
Simon Wunderlichc54f38c2013-07-29 17:56:44 +0200326/**
Marek Lindner411d6ed2013-05-08 13:31:59 +0800327 * batadv_max_header_len - calculate maximum encapsulation overhead for a
328 * payload packet
329 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200330 * Return: the maximum encapsulation overhead in bytes.
Marek Lindner411d6ed2013-05-08 13:31:59 +0800331 */
332int batadv_max_header_len(void)
333{
334 int header_len = 0;
335
336 header_len = max_t(int, header_len,
337 sizeof(struct batadv_unicast_packet));
338 header_len = max_t(int, header_len,
339 sizeof(struct batadv_unicast_4addr_packet));
340 header_len = max_t(int, header_len,
341 sizeof(struct batadv_bcast_packet));
342
343#ifdef CONFIG_BATMAN_ADV_NC
344 header_len = max_t(int, header_len,
345 sizeof(struct batadv_coded_packet));
346#endif
347
Marek Lindner1df0cbd2014-01-15 20:31:18 +0800348 return header_len + ETH_HLEN;
Marek Lindner411d6ed2013-05-08 13:31:59 +0800349}
350
351/**
Simon Wunderlichc54f38c2013-07-29 17:56:44 +0200352 * batadv_skb_set_priority - sets skb priority according to packet content
353 * @skb: the packet to be sent
354 * @offset: offset to the packet content
355 *
356 * This function sets a value between 256 and 263 (802.1d priority), which
357 * can be interpreted by the cfg80211 or other drivers.
358 */
359void batadv_skb_set_priority(struct sk_buff *skb, int offset)
360{
361 struct iphdr ip_hdr_tmp, *ip_hdr;
362 struct ipv6hdr ip6_hdr_tmp, *ip6_hdr;
363 struct ethhdr ethhdr_tmp, *ethhdr;
364 struct vlan_ethhdr *vhdr, vhdr_tmp;
365 u32 prio;
366
367 /* already set, do nothing */
368 if (skb->priority >= 256 && skb->priority <= 263)
369 return;
370
371 ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), &ethhdr_tmp);
372 if (!ethhdr)
373 return;
374
375 switch (ethhdr->h_proto) {
376 case htons(ETH_P_8021Q):
377 vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr),
378 sizeof(*vhdr), &vhdr_tmp);
379 if (!vhdr)
380 return;
381 prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK;
382 prio = prio >> VLAN_PRIO_SHIFT;
383 break;
384 case htons(ETH_P_IP):
385 ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
386 sizeof(*ip_hdr), &ip_hdr_tmp);
387 if (!ip_hdr)
388 return;
389 prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5;
390 break;
391 case htons(ETH_P_IPV6):
392 ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
393 sizeof(*ip6_hdr), &ip6_hdr_tmp);
394 if (!ip6_hdr)
395 return;
396 prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5;
397 break;
398 default:
399 return;
400 }
401
402 skb->priority = prio + 256;
403}
404
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200405static int batadv_recv_unhandled_packet(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200406 struct batadv_hard_iface *recv_if)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800407{
Sven Eckelmannb91a2542016-07-17 21:04:04 +0200408 kfree_skb(skb);
409
Marek Lindnerffa995e2012-03-01 15:35:17 +0800410 return NET_RX_DROP;
411}
412
413/* incoming packets with the batman ethertype received on any active hard
414 * interface
415 */
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200416int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
417 struct packet_type *ptype,
418 struct net_device *orig_dev)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800419{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200420 struct batadv_priv *bat_priv;
Sven Eckelmann96412692012-06-05 22:31:30 +0200421 struct batadv_ogm_packet *batadv_ogm_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200422 struct batadv_hard_iface *hard_iface;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200423 u8 idx;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800424
Sven Eckelmann56303d32012-06-05 22:31:31 +0200425 hard_iface = container_of(ptype, struct batadv_hard_iface,
426 batman_adv_ptype);
Sven Eckelmann4fe56e62016-03-05 16:09:17 +0100427
428 /* Prevent processing a packet received on an interface which is getting
429 * shut down otherwise the packet may trigger de-reference errors
430 * further down in the receive path.
431 */
432 if (!kref_get_unless_zero(&hard_iface->refcount))
433 goto err_out;
434
Marek Lindnerffa995e2012-03-01 15:35:17 +0800435 skb = skb_share_check(skb, GFP_ATOMIC);
436
437 /* skb was released by skb_share_check() */
438 if (!skb)
Sven Eckelmann4fe56e62016-03-05 16:09:17 +0100439 goto err_put;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800440
441 /* packet should hold at least type and version */
442 if (unlikely(!pskb_may_pull(skb, 2)))
443 goto err_free;
444
445 /* expect a valid ethernet header here. */
446 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
447 goto err_free;
448
449 if (!hard_iface->soft_iface)
450 goto err_free;
451
452 bat_priv = netdev_priv(hard_iface->soft_iface);
453
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200454 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800455 goto err_free;
456
457 /* discard frames on not active interfaces */
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200458 if (hard_iface->if_status != BATADV_IF_ACTIVE)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800459 goto err_free;
460
Sven Eckelmann96412692012-06-05 22:31:30 +0200461 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800462
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100463 if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200464 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200465 "Drop packet: incompatible batman version (%i)\n",
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100466 batadv_ogm_packet->version);
Marek Lindnerffa995e2012-03-01 15:35:17 +0800467 goto err_free;
468 }
469
Martin Hundebølle0d96772014-09-17 08:56:19 +0200470 /* reset control block to avoid left overs from previous users */
471 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
472
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100473 idx = batadv_ogm_packet->packet_type;
Sven Eckelmannb91a2542016-07-17 21:04:04 +0200474 (*batadv_rx_handler[idx])(skb, hard_iface);
Marek Lindnerffa995e2012-03-01 15:35:17 +0800475
Sven Eckelmann4fe56e62016-03-05 16:09:17 +0100476 batadv_hardif_put(hard_iface);
477
Marek Lindnerffa995e2012-03-01 15:35:17 +0800478 /* return NET_RX_SUCCESS in any case as we
479 * most probably dropped the packet for
480 * routing-logical reasons.
481 */
482 return NET_RX_SUCCESS;
483
484err_free:
485 kfree_skb(skb);
Sven Eckelmann4fe56e62016-03-05 16:09:17 +0100486err_put:
487 batadv_hardif_put(hard_iface);
Marek Lindnerffa995e2012-03-01 15:35:17 +0800488err_out:
489 return NET_RX_DROP;
490}
491
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200492static void batadv_recv_handler_init(void)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800493{
494 int i;
495
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200496 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
497 batadv_rx_handler[i] = batadv_recv_unhandled_packet;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800498
Simon Wunderlicha1f1ac52013-04-25 10:37:23 +0200499 for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
500 batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
501
Simon Wunderlich031ace82013-12-17 19:12:12 +0100502 /* compile time checks for sizes */
503 BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6);
504 BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24);
505 BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20);
506 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20);
507 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116);
508 BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10);
509 BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18);
510 BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20);
511 BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14);
512 BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46);
513 BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20);
514 BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4);
515 BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8);
516 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8);
517 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12);
518 BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8);
Simon Wunderlich80067c82013-04-25 10:37:22 +0200519
Linus LĂĽssinge2d9ba42017-02-17 11:17:07 +0100520 i = FIELD_SIZEOF(struct sk_buff, cb);
521 BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i);
522
Simon Wunderlicha1f1ac52013-04-25 10:37:23 +0200523 /* broadcast packet */
524 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
525
526 /* unicast packets ... */
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200527 /* unicast with 4 addresses packet */
528 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800529 /* unicast packet */
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200530 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
Marek Lindneref261572013-04-23 21:39:57 +0800531 /* unicast tvlv packet */
532 batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
Simon Wunderlicha1f1ac52013-04-25 10:37:23 +0200533 /* batman icmp packet */
534 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
Martin Hundebøll610bfc6bc2013-05-23 16:53:02 +0200535 /* Fragmented packets */
536 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800537}
538
Sven Eckelmann56303d32012-06-05 22:31:31 +0200539int
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200540batadv_recv_handler_register(u8 packet_type,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200541 int (*recv_handler)(struct sk_buff *,
542 struct batadv_hard_iface *))
Marek Lindnerffa995e2012-03-01 15:35:17 +0800543{
Sven Eckelmann706cc9f2017-09-30 09:24:28 +0200544 int (*curr)(struct sk_buff *skb,
545 struct batadv_hard_iface *recv_if);
Simon Wunderlicha1f1ac52013-04-25 10:37:23 +0200546 curr = batadv_rx_handler[packet_type];
547
Sven Eckelmann825ffe12017-08-23 21:52:13 +0200548 if (curr != batadv_recv_unhandled_packet &&
549 curr != batadv_recv_unhandled_unicast_packet)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800550 return -EBUSY;
551
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200552 batadv_rx_handler[packet_type] = recv_handler;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800553 return 0;
554}
555
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200556void batadv_recv_handler_unregister(u8 packet_type)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800557{
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200558 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800559}
560
Sven Eckelmann95a066d2012-10-17 21:10:39 +0200561/**
562 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
563 * the header
564 * @skb: skb pointing to fragmented socket buffers
565 * @payload_ptr: Pointer to position inside the head buffer of the skb
566 * marking the start of the data to be CRC'ed
567 *
568 * payload_ptr must always point to an address in the skb head buffer and not to
569 * a fragment.
Sven Eckelmann7afcbbe2015-10-31 12:29:29 +0100570 *
571 * Return: big endian crc32c of the checksummed data
Sven Eckelmann95a066d2012-10-17 21:10:39 +0200572 */
573__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
574{
575 u32 crc = 0;
576 unsigned int from;
577 unsigned int to = skb->len;
578 struct skb_seq_state st;
579 const u8 *data;
580 unsigned int len;
581 unsigned int consumed = 0;
582
583 from = (unsigned int)(payload_ptr - skb->data);
584
585 skb_prepare_seq_read(skb, from, to, &st);
586 while ((len = skb_seq_read(consumed, &data, &st)) != 0) {
587 crc = crc32c(crc, data, len);
588 consumed += len;
589 }
Sven Eckelmann95a066d2012-10-17 21:10:39 +0200590
591 return htonl(crc);
592}
593
Marek Lindneref261572013-04-23 21:39:57 +0800594/**
Antonio Quartullic018ad32013-06-04 12:11:39 +0200595 * batadv_get_vid - extract the VLAN identifier from skb if any
596 * @skb: the buffer containing the packet
597 * @header_len: length of the batman header preceding the ethernet header
598 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200599 * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the
600 * skb is vlan tagged. Otherwise BATADV_NO_FLAGS.
Antonio Quartullic018ad32013-06-04 12:11:39 +0200601 */
602unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
603{
604 struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len);
605 struct vlan_ethhdr *vhdr;
606 unsigned short vid;
607
608 if (ethhdr->h_proto != htons(ETH_P_8021Q))
609 return BATADV_NO_FLAGS;
610
611 if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN))
612 return BATADV_NO_FLAGS;
613
614 vhdr = (struct vlan_ethhdr *)(skb->data + header_len);
615 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
616 vid |= BATADV_VLAN_HAS_TAG;
617
618 return vid;
619}
620
Antonio Quartullieceb22a2013-11-16 12:03:51 +0100621/**
622 * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan
623 * @bat_priv: the bat priv with all the soft interface information
624 * @vid: the VLAN identifier for which the AP isolation attributed as to be
625 * looked up
626 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200627 * Return: true if AP isolation is on for the VLAN idenfied by vid, false
Antonio Quartullieceb22a2013-11-16 12:03:51 +0100628 * otherwise
629 */
630bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid)
631{
632 bool ap_isolation_enabled = false;
633 struct batadv_softif_vlan *vlan;
634
635 /* if the AP isolation is requested on a VLAN, then check for its
636 * setting in the proper VLAN private data structure
637 */
638 vlan = batadv_softif_vlan_get(bat_priv, vid);
639 if (vlan) {
640 ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
Sven Eckelmann9c3bf082016-01-17 11:01:21 +0100641 batadv_softif_vlan_put(vlan);
Antonio Quartullieceb22a2013-11-16 12:03:51 +0100642 }
643
644 return ap_isolation_enabled;
645}
646
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200647module_init(batadv_init);
648module_exit(batadv_exit);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000649
650MODULE_LICENSE("GPL");
651
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200652MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
653MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
654MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
655MODULE_VERSION(BATADV_SOURCE_VERSION);
Sven Eckelmann9791860c2016-06-10 23:00:55 +0200656MODULE_ALIAS_RTNL_LINK("batadv");
Sven Eckelmann2c0c06f2016-10-29 13:56:23 +0200657MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME);