blob: fb381fb26a66196942401ec6cb636c66e648a36a [file] [log] [blame]
Sven Eckelmannac79cbb2017-01-01 00:00:00 +01001/* Copyright (C) 2007-2017 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00002 *
3 * Marek Lindner, Simon Wunderlich
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
Antonio Quartulliebf38fb2013-11-03 20:40:48 +010015 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000016 */
17
18#include "main.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020019
20#include <linux/atomic.h>
21#include <linux/bug.h>
22#include <linux/byteorder/generic.h>
23#include <linux/crc32c.h>
24#include <linux/errno.h>
25#include <linux/fs.h>
Sven Eckelmann2c0c06f2016-10-29 13:56:23 +020026#include <linux/genetlink.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020027#include <linux/if_ether.h>
28#include <linux/if_vlan.h>
29#include <linux/init.h>
30#include <linux/ip.h>
31#include <linux/ipv6.h>
32#include <linux/kernel.h>
Sven Eckelmannf7157dd2016-01-16 10:29:48 +010033#include <linux/kref.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020034#include <linux/list.h>
35#include <linux/module.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020036#include <linux/netdevice.h>
Sven Eckelmannba412082016-05-15 23:48:31 +020037#include <linux/printk.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020038#include <linux/rculist.h>
39#include <linux/rcupdate.h>
40#include <linux/seq_file.h>
41#include <linux/skbuff.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020042#include <linux/spinlock.h>
43#include <linux/stddef.h>
44#include <linux/string.h>
45#include <linux/workqueue.h>
46#include <net/dsfield.h>
47#include <net/rtnetlink.h>
Sven Eckelmann2c0c06f2016-10-29 13:56:23 +020048#include <uapi/linux/batman_adv.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020049
50#include "bat_algo.h"
Sven Eckelmanna2d08162016-05-15 11:07:46 +020051#include "bat_iv_ogm.h"
52#include "bat_v.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020053#include "bridge_loop_avoidance.h"
Sven Eckelmannb706b132012-06-10 23:58:51 +020054#include "debugfs.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020055#include "distributed-arp-table.h"
56#include "gateway_client.h"
57#include "gateway_common.h"
58#include "hard-interface.h"
59#include "icmp_socket.h"
Sven Eckelmannba412082016-05-15 23:48:31 +020060#include "log.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020061#include "multicast.h"
Matthias Schiffer09748a22016-05-09 18:41:08 +020062#include "netlink.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020063#include "network-coding.h"
64#include "originator.h"
65#include "packet.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000066#include "routing.h"
67#include "send.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000068#include "soft-interface.h"
Antonio Quartulli33a3bb42016-05-05 13:09:43 +020069#include "tp_meter.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000070#include "translation-table.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000071
Sven Eckelmannc3caf512011-05-03 11:51:38 +020072/* List manipulations on hardif_list have to be rtnl_lock()'ed,
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +020073 * list traversals just rcu-locked
74 */
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020075struct list_head batadv_hardif_list;
Sven Eckelmannee11ad62012-05-16 20:23:19 +020076static int (*batadv_rx_handler[256])(struct sk_buff *,
Sven Eckelmann56303d32012-06-05 22:31:31 +020077 struct batadv_hard_iface *);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000078
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020079unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000080
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020081struct workqueue_struct *batadv_event_workqueue;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000082
Sven Eckelmannee11ad62012-05-16 20:23:19 +020083static void batadv_recv_handler_init(void);
Marek Lindnerffa995e2012-03-01 15:35:17 +080084
Sven Eckelmannee11ad62012-05-16 20:23:19 +020085static int __init batadv_init(void)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000086{
Sven Eckelmann86452f82016-06-25 16:44:06 +020087 int ret;
88
89 ret = batadv_tt_cache_init();
90 if (ret < 0)
91 return ret;
92
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020093 INIT_LIST_HEAD(&batadv_hardif_list);
Sven Eckelmann01d350d2016-05-15 11:07:44 +020094 batadv_algo_init();
Marek Lindner1c280472011-11-28 17:40:17 +080095
Sven Eckelmannee11ad62012-05-16 20:23:19 +020096 batadv_recv_handler_init();
Marek Lindnerffa995e2012-03-01 15:35:17 +080097
Linus Luessingd6f94d92016-01-16 16:40:09 +080098 batadv_v_init();
Sven Eckelmann81c524f2012-05-12 02:09:22 +020099 batadv_iv_init();
Matthias Schiffer6c519ba2013-09-27 18:03:39 +0200100 batadv_nc_init();
Antonio Quartulli33a3bb42016-05-05 13:09:43 +0200101 batadv_tp_meter_init();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000102
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200103 batadv_event_workqueue = create_singlethread_workqueue("bat_events");
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200104 if (!batadv_event_workqueue)
Sven Eckelmann86452f82016-06-25 16:44:06 +0200105 goto err_create_wq;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000106
Sven Eckelmann9039dc72012-05-12 02:09:33 +0200107 batadv_socket_init();
Sven Eckelmann40a072d2012-05-12 02:09:23 +0200108 batadv_debugfs_init();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000109
Sven Eckelmann95638772012-05-12 02:09:31 +0200110 register_netdevice_notifier(&batadv_hard_if_notifier);
Sven Eckelmanna4ac28c2013-02-11 17:10:26 +0800111 rtnl_link_register(&batadv_link_ops);
Matthias Schiffer09748a22016-05-09 18:41:08 +0200112 batadv_netlink_register();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000113
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100114 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200115 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000116
117 return 0;
Sven Eckelmann86452f82016-06-25 16:44:06 +0200118
119err_create_wq:
120 batadv_tt_cache_destroy();
121
122 return -ENOMEM;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000123}
124
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200125static void __exit batadv_exit(void)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000126{
Sven Eckelmann40a072d2012-05-12 02:09:23 +0200127 batadv_debugfs_destroy();
Matthias Schiffer09748a22016-05-09 18:41:08 +0200128 batadv_netlink_unregister();
Sven Eckelmanna4ac28c2013-02-11 17:10:26 +0800129 rtnl_link_unregister(&batadv_link_ops);
Sven Eckelmann95638772012-05-12 02:09:31 +0200130 unregister_netdevice_notifier(&batadv_hard_if_notifier);
131 batadv_hardif_remove_interfaces();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000132
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200133 flush_workqueue(batadv_event_workqueue);
134 destroy_workqueue(batadv_event_workqueue);
135 batadv_event_workqueue = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000136
137 rcu_barrier();
Sven Eckelmann86452f82016-06-25 16:44:06 +0200138
139 batadv_tt_cache_destroy();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000140}
141
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200142int batadv_mesh_init(struct net_device *soft_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000143{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200144 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200145 int ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000146
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000147 spin_lock_init(&bat_priv->forw_bat_list_lock);
148 spin_lock_init(&bat_priv->forw_bcast_list_lock);
Sven Eckelmann807736f2012-07-15 22:26:51 +0200149 spin_lock_init(&bat_priv->tt.changes_list_lock);
150 spin_lock_init(&bat_priv->tt.req_list_lock);
151 spin_lock_init(&bat_priv->tt.roam_list_lock);
152 spin_lock_init(&bat_priv->tt.last_changeset_lock);
Antonio Quartullia70a9aa2013-07-30 22:16:24 +0200153 spin_lock_init(&bat_priv->tt.commit_lock);
Sven Eckelmann807736f2012-07-15 22:26:51 +0200154 spin_lock_init(&bat_priv->gw.list_lock);
Linus LĂĽssingab498862014-02-15 17:47:53 +0100155#ifdef CONFIG_BATMAN_ADV_MCAST
156 spin_lock_init(&bat_priv->mcast.want_lists_lock);
157#endif
Marek Lindneref261572013-04-23 21:39:57 +0800158 spin_lock_init(&bat_priv->tvlv.container_list_lock);
159 spin_lock_init(&bat_priv->tvlv.handler_list_lock);
Antonio Quartulli5d2c05b2013-07-02 11:04:34 +0200160 spin_lock_init(&bat_priv->softif_vlan_list_lock);
Antonio Quartulli33a3bb42016-05-05 13:09:43 +0200161 spin_lock_init(&bat_priv->tp_list_lock);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000162
163 INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
164 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
Sven Eckelmann70ea5ce2016-07-27 12:31:08 +0200165 INIT_HLIST_HEAD(&bat_priv->gw.gateway_list);
Linus LĂĽssingab498862014-02-15 17:47:53 +0100166#ifdef CONFIG_BATMAN_ADV_MCAST
167 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
Linus LĂĽssing4c8755d2014-02-15 17:47:54 +0100168 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list);
169 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list);
Linus LĂĽssingab498862014-02-15 17:47:53 +0100170#endif
Sven Eckelmann807736f2012-07-15 22:26:51 +0200171 INIT_LIST_HEAD(&bat_priv->tt.changes_list);
Marek Lindner7c26a532015-06-28 22:16:06 +0800172 INIT_HLIST_HEAD(&bat_priv->tt.req_list);
Sven Eckelmann807736f2012-07-15 22:26:51 +0200173 INIT_LIST_HEAD(&bat_priv->tt.roam_list);
Linus LĂĽssingc5caf4e2014-02-15 17:47:49 +0100174#ifdef CONFIG_BATMAN_ADV_MCAST
175 INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
176#endif
Marek Lindneref261572013-04-23 21:39:57 +0800177 INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
178 INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
Antonio Quartulli5d2c05b2013-07-02 11:04:34 +0200179 INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
Antonio Quartulli33a3bb42016-05-05 13:09:43 +0200180 INIT_HLIST_HEAD(&bat_priv->tp_list);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000181
Antonio Quartulli0da00352016-01-16 16:40:12 +0800182 ret = batadv_v_mesh_init(bat_priv);
183 if (ret < 0)
184 goto err;
185
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200186 ret = batadv_originator_init(bat_priv);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200187 if (ret < 0)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000188 goto err;
189
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200190 ret = batadv_tt_init(bat_priv);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200191 if (ret < 0)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000192 goto err;
193
Sven Eckelmann08adf152012-05-12 13:38:47 +0200194 ret = batadv_bla_init(bat_priv);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200195 if (ret < 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100196 goto err;
197
Antonio Quartulli2f1dfbe2012-06-30 20:01:19 +0200198 ret = batadv_dat_init(bat_priv);
199 if (ret < 0)
200 goto err;
201
Matthias Schiffer6c519ba2013-09-27 18:03:39 +0200202 ret = batadv_nc_mesh_init(bat_priv);
Martin Hundebølld353d8d2013-01-25 11:12:38 +0100203 if (ret < 0)
204 goto err;
205
Marek Lindner414254e2013-04-23 21:39:58 +0800206 batadv_gw_init(bat_priv);
Linus LĂĽssing60432d72014-02-15 17:47:51 +0100207 batadv_mcast_init(bat_priv);
Marek Lindner414254e2013-04-23 21:39:58 +0800208
Sven Eckelmann807736f2012-07-15 22:26:51 +0200209 atomic_set(&bat_priv->gw.reselect, 0);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200210 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200211
212 return 0;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000213
214err:
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200215 batadv_mesh_free(soft_iface);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200216 return ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000217}
218
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200219void batadv_mesh_free(struct net_device *soft_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000220{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200221 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000222
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200223 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000224
Sven Eckelmann9455e342012-05-12 02:09:37 +0200225 batadv_purge_outstanding_packets(bat_priv, NULL);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000226
Simon Wunderlichbd3524c2015-08-03 19:13:58 +0200227 batadv_gw_node_free(bat_priv);
Antonio Quartulli0da00352016-01-16 16:40:12 +0800228
229 batadv_v_mesh_free(bat_priv);
Matthias Schiffer6c519ba2013-09-27 18:03:39 +0200230 batadv_nc_mesh_free(bat_priv);
Antonio Quartullia4361862013-05-07 01:06:18 +0200231 batadv_dat_free(bat_priv);
Sven Eckelmann08adf152012-05-12 13:38:47 +0200232 batadv_bla_free(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +0100233
Linus LĂĽssingc5caf4e2014-02-15 17:47:49 +0100234 batadv_mcast_free(bat_priv);
235
Antonio Quartullia4361862013-05-07 01:06:18 +0200236 /* Free the TT and the originator tables only after having terminated
237 * all the other depending components which may use these structures for
238 * their purposes.
239 */
240 batadv_tt_free(bat_priv);
241
242 /* Since the originator table clean up routine is accessing the TT
243 * tables as well, it has to be invoked after the TT tables have been
244 * freed and marked as empty. This ensures that no cleanup RCU callbacks
245 * accessing the TT data are scheduled for later execution.
246 */
247 batadv_originator_free(bat_priv);
Antonio Quartulli2f1dfbe2012-06-30 20:01:19 +0200248
Marek Lindner414254e2013-04-23 21:39:58 +0800249 batadv_gw_free(bat_priv);
250
Martin Hundebøllf8214862012-04-20 17:02:45 +0200251 free_percpu(bat_priv->bat_counters);
Martin Hundebøllf69ae772013-04-17 21:13:16 +0200252 bat_priv->bat_counters = NULL;
Martin Hundebøllf8214862012-04-20 17:02:45 +0200253
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200254 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000255}
256
David S. Miller6e0895c2013-04-22 20:32:51 -0400257/**
258 * batadv_is_my_mac - check if the given mac address belongs to any of the real
259 * interfaces in the current mesh
260 * @bat_priv: the bat priv with all the soft interface information
261 * @addr: the address to check
Markus Pargmanne8ad3b12014-12-26 12:41:38 +0100262 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200263 * Return: 'true' if the mac address was found, false otherwise.
David S. Miller6e0895c2013-04-22 20:32:51 -0400264 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200265bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000266{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200267 const struct batadv_hard_iface *hard_iface;
Markus Pargmanne8ad3b12014-12-26 12:41:38 +0100268 bool is_my_mac = false;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000269
270 rcu_read_lock();
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200271 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200272 if (hard_iface->if_status != BATADV_IF_ACTIVE)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000273 continue;
274
Antonio Quartullife8a93b2013-04-03 19:10:26 +0200275 if (hard_iface->soft_iface != bat_priv->soft_iface)
276 continue;
277
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200278 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
Markus Pargmanne8ad3b12014-12-26 12:41:38 +0100279 is_my_mac = true;
280 break;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000281 }
282 }
283 rcu_read_unlock();
Markus Pargmanne8ad3b12014-12-26 12:41:38 +0100284 return is_my_mac;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000285}
286
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +0200287#ifdef CONFIG_BATMAN_ADV_DEBUGFS
Marek Lindner30da63a2012-08-03 17:15:46 +0200288/**
289 * batadv_seq_print_text_primary_if_get - called from debugfs table printing
290 * function that requires the primary interface
291 * @seq: debugfs table seq_file struct
292 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200293 * Return: primary interface if found or NULL otherwise.
Marek Lindner30da63a2012-08-03 17:15:46 +0200294 */
295struct batadv_hard_iface *
296batadv_seq_print_text_primary_if_get(struct seq_file *seq)
297{
298 struct net_device *net_dev = (struct net_device *)seq->private;
299 struct batadv_priv *bat_priv = netdev_priv(net_dev);
300 struct batadv_hard_iface *primary_if;
301
302 primary_if = batadv_primary_if_get_selected(bat_priv);
303
304 if (!primary_if) {
305 seq_printf(seq,
306 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
307 net_dev->name);
308 goto out;
309 }
310
311 if (primary_if->if_status == BATADV_IF_ACTIVE)
312 goto out;
313
314 seq_printf(seq,
315 "BATMAN mesh %s disabled - primary interface not active\n",
316 net_dev->name);
Sven Eckelmann82047ad2016-01-17 11:01:10 +0100317 batadv_hardif_put(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +0200318 primary_if = NULL;
319
320out:
321 return primary_if;
322}
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +0200323#endif
Marek Lindner30da63a2012-08-03 17:15:46 +0200324
Simon Wunderlichc54f38c92013-07-29 17:56:44 +0200325/**
Marek Lindner411d6ed2013-05-08 13:31:59 +0800326 * batadv_max_header_len - calculate maximum encapsulation overhead for a
327 * payload packet
328 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200329 * Return: the maximum encapsulation overhead in bytes.
Marek Lindner411d6ed2013-05-08 13:31:59 +0800330 */
331int batadv_max_header_len(void)
332{
333 int header_len = 0;
334
335 header_len = max_t(int, header_len,
336 sizeof(struct batadv_unicast_packet));
337 header_len = max_t(int, header_len,
338 sizeof(struct batadv_unicast_4addr_packet));
339 header_len = max_t(int, header_len,
340 sizeof(struct batadv_bcast_packet));
341
342#ifdef CONFIG_BATMAN_ADV_NC
343 header_len = max_t(int, header_len,
344 sizeof(struct batadv_coded_packet));
345#endif
346
Marek Lindner1df0cbd2014-01-15 20:31:18 +0800347 return header_len + ETH_HLEN;
Marek Lindner411d6ed2013-05-08 13:31:59 +0800348}
349
350/**
Simon Wunderlichc54f38c92013-07-29 17:56:44 +0200351 * batadv_skb_set_priority - sets skb priority according to packet content
352 * @skb: the packet to be sent
353 * @offset: offset to the packet content
354 *
355 * This function sets a value between 256 and 263 (802.1d priority), which
356 * can be interpreted by the cfg80211 or other drivers.
357 */
358void batadv_skb_set_priority(struct sk_buff *skb, int offset)
359{
360 struct iphdr ip_hdr_tmp, *ip_hdr;
361 struct ipv6hdr ip6_hdr_tmp, *ip6_hdr;
362 struct ethhdr ethhdr_tmp, *ethhdr;
363 struct vlan_ethhdr *vhdr, vhdr_tmp;
364 u32 prio;
365
366 /* already set, do nothing */
367 if (skb->priority >= 256 && skb->priority <= 263)
368 return;
369
370 ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), &ethhdr_tmp);
371 if (!ethhdr)
372 return;
373
374 switch (ethhdr->h_proto) {
375 case htons(ETH_P_8021Q):
376 vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr),
377 sizeof(*vhdr), &vhdr_tmp);
378 if (!vhdr)
379 return;
380 prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK;
381 prio = prio >> VLAN_PRIO_SHIFT;
382 break;
383 case htons(ETH_P_IP):
384 ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
385 sizeof(*ip_hdr), &ip_hdr_tmp);
386 if (!ip_hdr)
387 return;
388 prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5;
389 break;
390 case htons(ETH_P_IPV6):
391 ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
392 sizeof(*ip6_hdr), &ip6_hdr_tmp);
393 if (!ip6_hdr)
394 return;
395 prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5;
396 break;
397 default:
398 return;
399 }
400
401 skb->priority = prio + 256;
402}
403
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200404static int batadv_recv_unhandled_packet(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200405 struct batadv_hard_iface *recv_if)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800406{
Sven Eckelmannb91a2542016-07-17 21:04:04 +0200407 kfree_skb(skb);
408
Marek Lindnerffa995e2012-03-01 15:35:17 +0800409 return NET_RX_DROP;
410}
411
412/* incoming packets with the batman ethertype received on any active hard
413 * interface
414 */
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200415int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
416 struct packet_type *ptype,
417 struct net_device *orig_dev)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800418{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200419 struct batadv_priv *bat_priv;
Sven Eckelmann96412692012-06-05 22:31:30 +0200420 struct batadv_ogm_packet *batadv_ogm_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200421 struct batadv_hard_iface *hard_iface;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200422 u8 idx;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800423
Sven Eckelmann56303d32012-06-05 22:31:31 +0200424 hard_iface = container_of(ptype, struct batadv_hard_iface,
425 batman_adv_ptype);
Sven Eckelmann4fe56e62016-03-05 16:09:17 +0100426
427 /* Prevent processing a packet received on an interface which is getting
428 * shut down otherwise the packet may trigger de-reference errors
429 * further down in the receive path.
430 */
431 if (!kref_get_unless_zero(&hard_iface->refcount))
432 goto err_out;
433
Marek Lindnerffa995e2012-03-01 15:35:17 +0800434 skb = skb_share_check(skb, GFP_ATOMIC);
435
436 /* skb was released by skb_share_check() */
437 if (!skb)
Sven Eckelmann4fe56e62016-03-05 16:09:17 +0100438 goto err_put;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800439
440 /* packet should hold at least type and version */
441 if (unlikely(!pskb_may_pull(skb, 2)))
442 goto err_free;
443
444 /* expect a valid ethernet header here. */
445 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
446 goto err_free;
447
448 if (!hard_iface->soft_iface)
449 goto err_free;
450
451 bat_priv = netdev_priv(hard_iface->soft_iface);
452
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200453 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800454 goto err_free;
455
456 /* discard frames on not active interfaces */
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200457 if (hard_iface->if_status != BATADV_IF_ACTIVE)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800458 goto err_free;
459
Sven Eckelmann96412692012-06-05 22:31:30 +0200460 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800461
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100462 if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200463 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200464 "Drop packet: incompatible batman version (%i)\n",
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100465 batadv_ogm_packet->version);
Marek Lindnerffa995e2012-03-01 15:35:17 +0800466 goto err_free;
467 }
468
Martin Hundebølle0d96772014-09-17 08:56:19 +0200469 /* reset control block to avoid left overs from previous users */
470 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
471
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100472 idx = batadv_ogm_packet->packet_type;
Sven Eckelmannb91a2542016-07-17 21:04:04 +0200473 (*batadv_rx_handler[idx])(skb, hard_iface);
Marek Lindnerffa995e2012-03-01 15:35:17 +0800474
Sven Eckelmann4fe56e62016-03-05 16:09:17 +0100475 batadv_hardif_put(hard_iface);
476
Marek Lindnerffa995e2012-03-01 15:35:17 +0800477 /* return NET_RX_SUCCESS in any case as we
478 * most probably dropped the packet for
479 * routing-logical reasons.
480 */
481 return NET_RX_SUCCESS;
482
483err_free:
484 kfree_skb(skb);
Sven Eckelmann4fe56e62016-03-05 16:09:17 +0100485err_put:
486 batadv_hardif_put(hard_iface);
Marek Lindnerffa995e2012-03-01 15:35:17 +0800487err_out:
488 return NET_RX_DROP;
489}
490
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200491static void batadv_recv_handler_init(void)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800492{
493 int i;
494
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200495 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
496 batadv_rx_handler[i] = batadv_recv_unhandled_packet;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800497
Simon Wunderlicha1f1ac52013-04-25 10:37:23 +0200498 for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
499 batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
500
Simon Wunderlich031ace82013-12-17 19:12:12 +0100501 /* compile time checks for sizes */
502 BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6);
503 BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24);
504 BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20);
505 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20);
506 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116);
507 BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10);
508 BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18);
509 BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20);
510 BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14);
511 BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46);
512 BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20);
513 BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4);
514 BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8);
515 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8);
516 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12);
517 BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8);
Simon Wunderlich80067c82013-04-25 10:37:22 +0200518
Linus LĂĽssinge2d9ba42017-02-17 11:17:07 +0100519 i = FIELD_SIZEOF(struct sk_buff, cb);
520 BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i);
521
Simon Wunderlicha1f1ac52013-04-25 10:37:23 +0200522 /* broadcast packet */
523 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
524
525 /* unicast packets ... */
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +0200526 /* unicast with 4 addresses packet */
527 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800528 /* unicast packet */
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200529 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
Marek Lindneref261572013-04-23 21:39:57 +0800530 /* unicast tvlv packet */
531 batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
Simon Wunderlicha1f1ac52013-04-25 10:37:23 +0200532 /* batman icmp packet */
533 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
Martin Hundebøll610bfc6bc2013-05-23 16:53:02 +0200534 /* Fragmented packets */
535 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800536}
537
Sven Eckelmann56303d32012-06-05 22:31:31 +0200538int
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200539batadv_recv_handler_register(u8 packet_type,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200540 int (*recv_handler)(struct sk_buff *,
541 struct batadv_hard_iface *))
Marek Lindnerffa995e2012-03-01 15:35:17 +0800542{
Simon Wunderlicha1f1ac52013-04-25 10:37:23 +0200543 int (*curr)(struct sk_buff *,
544 struct batadv_hard_iface *);
545 curr = batadv_rx_handler[packet_type];
546
547 if ((curr != batadv_recv_unhandled_packet) &&
548 (curr != batadv_recv_unhandled_unicast_packet))
Marek Lindnerffa995e2012-03-01 15:35:17 +0800549 return -EBUSY;
550
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200551 batadv_rx_handler[packet_type] = recv_handler;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800552 return 0;
553}
554
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200555void batadv_recv_handler_unregister(u8 packet_type)
Marek Lindnerffa995e2012-03-01 15:35:17 +0800556{
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200557 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
Marek Lindnerffa995e2012-03-01 15:35:17 +0800558}
559
Sven Eckelmann95a066d2012-10-17 21:10:39 +0200560/**
561 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
562 * the header
563 * @skb: skb pointing to fragmented socket buffers
564 * @payload_ptr: Pointer to position inside the head buffer of the skb
565 * marking the start of the data to be CRC'ed
566 *
567 * payload_ptr must always point to an address in the skb head buffer and not to
568 * a fragment.
Sven Eckelmann7afcbbe2015-10-31 12:29:29 +0100569 *
570 * Return: big endian crc32c of the checksummed data
Sven Eckelmann95a066d2012-10-17 21:10:39 +0200571 */
572__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
573{
574 u32 crc = 0;
575 unsigned int from;
576 unsigned int to = skb->len;
577 struct skb_seq_state st;
578 const u8 *data;
579 unsigned int len;
580 unsigned int consumed = 0;
581
582 from = (unsigned int)(payload_ptr - skb->data);
583
584 skb_prepare_seq_read(skb, from, to, &st);
585 while ((len = skb_seq_read(consumed, &data, &st)) != 0) {
586 crc = crc32c(crc, data, len);
587 consumed += len;
588 }
Sven Eckelmann95a066d2012-10-17 21:10:39 +0200589
590 return htonl(crc);
591}
592
Marek Lindneref261572013-04-23 21:39:57 +0800593/**
Antonio Quartullic018ad32013-06-04 12:11:39 +0200594 * batadv_get_vid - extract the VLAN identifier from skb if any
595 * @skb: the buffer containing the packet
596 * @header_len: length of the batman header preceding the ethernet header
597 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200598 * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the
599 * skb is vlan tagged. Otherwise BATADV_NO_FLAGS.
Antonio Quartullic018ad32013-06-04 12:11:39 +0200600 */
601unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
602{
603 struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len);
604 struct vlan_ethhdr *vhdr;
605 unsigned short vid;
606
607 if (ethhdr->h_proto != htons(ETH_P_8021Q))
608 return BATADV_NO_FLAGS;
609
610 if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN))
611 return BATADV_NO_FLAGS;
612
613 vhdr = (struct vlan_ethhdr *)(skb->data + header_len);
614 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
615 vid |= BATADV_VLAN_HAS_TAG;
616
617 return vid;
618}
619
Antonio Quartullieceb22a2013-11-16 12:03:51 +0100620/**
621 * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan
622 * @bat_priv: the bat priv with all the soft interface information
623 * @vid: the VLAN identifier for which the AP isolation attributed as to be
624 * looked up
625 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200626 * Return: true if AP isolation is on for the VLAN idenfied by vid, false
Antonio Quartullieceb22a2013-11-16 12:03:51 +0100627 * otherwise
628 */
629bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid)
630{
631 bool ap_isolation_enabled = false;
632 struct batadv_softif_vlan *vlan;
633
634 /* if the AP isolation is requested on a VLAN, then check for its
635 * setting in the proper VLAN private data structure
636 */
637 vlan = batadv_softif_vlan_get(bat_priv, vid);
638 if (vlan) {
639 ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
Sven Eckelmann9c3bf082016-01-17 11:01:21 +0100640 batadv_softif_vlan_put(vlan);
Antonio Quartullieceb22a2013-11-16 12:03:51 +0100641 }
642
643 return ap_isolation_enabled;
644}
645
Sven Eckelmannee11ad62012-05-16 20:23:19 +0200646module_init(batadv_init);
647module_exit(batadv_exit);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000648
649MODULE_LICENSE("GPL");
650
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200651MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
652MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
653MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
654MODULE_VERSION(BATADV_SOURCE_VERSION);
Sven Eckelmann9791860c2016-06-10 23:00:55 +0200655MODULE_ALIAS_RTNL_LINK("batadv");
Sven Eckelmann2c0c06f2016-10-29 13:56:23 +0200656MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME);