blob: 5839c569f769ef7137fca9b92915799b78e21123 [file] [log] [blame]
Sven Eckelmann0046b042016-01-01 00:01:03 +01001/* Copyright (C) 2009-2016 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00002 *
3 * Marek Lindner
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
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000018#include "gateway_client.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020019#include "main.h"
20
21#include <linux/atomic.h>
22#include <linux/byteorder/generic.h>
23#include <linux/etherdevice.h>
24#include <linux/fs.h>
25#include <linux/if_ether.h>
26#include <linux/if_vlan.h>
27#include <linux/in.h>
28#include <linux/ip.h>
29#include <linux/ipv6.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020030#include <linux/kernel.h>
Sven Eckelmanne7aed322016-01-16 10:29:41 +010031#include <linux/kref.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020032#include <linux/list.h>
33#include <linux/netdevice.h>
34#include <linux/rculist.h>
35#include <linux/rcupdate.h>
36#include <linux/seq_file.h>
37#include <linux/skbuff.h>
38#include <linux/slab.h>
39#include <linux/spinlock.h>
40#include <linux/stddef.h>
41#include <linux/udp.h>
42
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000043#include "gateway_common.h"
44#include "hard-interface.h"
Linus Lüssing57f0c072011-03-14 22:43:33 +000045#include "originator.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020046#include "packet.h"
Antonio Quartulli43676ab2011-04-26 21:31:45 +020047#include "routing.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020048#include "sysfs.h"
49#include "translation-table.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000050
Antonio Quartulli6c413b12013-11-05 19:31:08 +010051/* These are the offsets of the "hw type" and "hw address length" in the dhcp
52 * packet starting at the beginning of the dhcp header
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +020053 */
Antonio Quartulli6c413b12013-11-05 19:31:08 +010054#define BATADV_DHCP_HTYPE_OFFSET 1
55#define BATADV_DHCP_HLEN_OFFSET 2
56/* Value of htype representing Ethernet */
57#define BATADV_DHCP_HTYPE_ETHERNET 0x01
58/* This is the offset of the "chaddr" field in the dhcp packet starting at the
59 * beginning of the dhcp header
60 */
61#define BATADV_DHCP_CHADDR_OFFSET 28
Antonio Quartulli43676ab2011-04-26 21:31:45 +020062
Sven Eckelmanne7aed322016-01-16 10:29:41 +010063/**
64 * batadv_gw_node_release - release gw_node from lists and queue for free after
65 * rcu grace period
66 * @ref: kref pointer of the gw_node
67 */
68static void batadv_gw_node_release(struct kref *ref)
69{
70 struct batadv_gw_node *gw_node;
71
72 gw_node = container_of(ref, struct batadv_gw_node, refcount);
73
Sven Eckelmann5d967312016-01-17 11:01:09 +010074 batadv_orig_node_put(gw_node->orig_node);
Sven Eckelmanne7aed322016-01-16 10:29:41 +010075 kfree_rcu(gw_node, rcu);
76}
77
78/**
Sven Eckelmann3a017432016-01-17 11:01:18 +010079 * batadv_gw_node_put - decrement the gw_node refcounter and possibly release it
Sven Eckelmanne7aed322016-01-16 10:29:41 +010080 * @gw_node: gateway node to free
81 */
Sven Eckelmann3a017432016-01-17 11:01:18 +010082static void batadv_gw_node_put(struct batadv_gw_node *gw_node)
Marek Lindner25b6d3c2011-02-10 14:33:49 +000083{
Sven Eckelmanne7aed322016-01-16 10:29:41 +010084 kref_put(&gw_node->refcount, batadv_gw_node_release);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000085}
86
Sven Eckelmann56303d32012-06-05 22:31:31 +020087static struct batadv_gw_node *
88batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000089{
Sven Eckelmann56303d32012-06-05 22:31:31 +020090 struct batadv_gw_node *gw_node;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000091
Linus Lüssing5d02b3c2011-02-13 21:13:02 +000092 rcu_read_lock();
Sven Eckelmann807736f2012-07-15 22:26:51 +020093 gw_node = rcu_dereference(bat_priv->gw.curr_gw);
Marek Lindnerc4aac1a2011-03-23 11:24:34 +010094 if (!gw_node)
Linus Lüssing5d02b3c2011-02-13 21:13:02 +000095 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000096
Sven Eckelmanne7aed322016-01-16 10:29:41 +010097 if (!kref_get_unless_zero(&gw_node->refcount))
Marek Lindnerc4aac1a2011-03-23 11:24:34 +010098 gw_node = NULL;
99
100out:
101 rcu_read_unlock();
102 return gw_node;
103}
104
Sven Eckelmann56303d32012-06-05 22:31:31 +0200105struct batadv_orig_node *
106batadv_gw_get_selected_orig(struct batadv_priv *bat_priv)
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100107{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200108 struct batadv_gw_node *gw_node;
109 struct batadv_orig_node *orig_node = NULL;
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100110
Sven Eckelmann1409a832012-05-12 18:33:55 +0200111 gw_node = batadv_gw_get_selected_gw_node(bat_priv);
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100112 if (!gw_node)
Marek Lindner7b36e8e2011-02-18 12:28:10 +0000113 goto out;
Linus Lüssing5d02b3c2011-02-13 21:13:02 +0000114
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100115 rcu_read_lock();
116 orig_node = gw_node->orig_node;
117 if (!orig_node)
118 goto unlock;
119
Sven Eckelmann7c124392016-01-16 10:29:56 +0100120 if (!kref_get_unless_zero(&orig_node->refcount))
Marek Lindner7b36e8e2011-02-18 12:28:10 +0000121 orig_node = NULL;
Linus Lüssing43c70ad2011-02-13 21:13:04 +0000122
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100123unlock:
Linus Lüssing5d02b3c2011-02-13 21:13:02 +0000124 rcu_read_unlock();
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100125out:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000126 if (gw_node)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100127 batadv_gw_node_put(gw_node);
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100128 return orig_node;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000129}
130
Sven Eckelmann56303d32012-06-05 22:31:31 +0200131static void batadv_gw_select(struct batadv_priv *bat_priv,
132 struct batadv_gw_node *new_gw_node)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000133{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200134 struct batadv_gw_node *curr_gw_node;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000135
Sven Eckelmann807736f2012-07-15 22:26:51 +0200136 spin_lock_bh(&bat_priv->gw.list_lock);
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100137
Sven Eckelmanna08d4972016-03-05 16:09:22 +0100138 if (new_gw_node)
139 kref_get(&new_gw_node->refcount);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000140
Sven Eckelmann807736f2012-07-15 22:26:51 +0200141 curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1);
142 rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node);
Marek Lindner25b6d3c2011-02-10 14:33:49 +0000143
144 if (curr_gw_node)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100145 batadv_gw_node_put(curr_gw_node);
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100146
Sven Eckelmann807736f2012-07-15 22:26:51 +0200147 spin_unlock_bh(&bat_priv->gw.list_lock);
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100148}
149
Antonio Quartulli4e820e72013-11-04 20:59:41 +0100150/**
151 * batadv_gw_reselect - force a gateway reselection
152 * @bat_priv: the bat priv with all the soft interface information
153 *
154 * Set a flag to remind the GW component to perform a new gateway reselection.
155 * However this function does not ensure that the current gateway is going to be
156 * deselected. The reselection mechanism may elect the same gateway once again.
157 *
158 * This means that invoking batadv_gw_reselect() does not guarantee a gateway
159 * change and therefore a uevent is not necessarily expected.
160 */
161void batadv_gw_reselect(struct batadv_priv *bat_priv)
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100162{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200163 atomic_set(&bat_priv->gw.reselect, 1);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000164}
165
Sven Eckelmann56303d32012-06-05 22:31:31 +0200166static struct batadv_gw_node *
167batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000168{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200169 struct batadv_neigh_node *router;
Simon Wunderlich89652332013-11-13 19:14:46 +0100170 struct batadv_neigh_ifinfo *router_ifinfo;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200171 struct batadv_gw_node *gw_node, *curr_gw = NULL;
Sven Eckelmann4f248cf2015-06-09 20:50:49 +0200172 u64 max_gw_factor = 0;
173 u64 tmp_gw_factor = 0;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200174 u8 max_tq = 0;
175 u8 tq_avg;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200176 struct batadv_orig_node *orig_node;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000177
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000178 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800179 hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
Sven Eckelmann84d5e5e2012-05-12 02:09:30 +0200180 orig_node = gw_node->orig_node;
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100181 router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000182 if (!router)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000183 continue;
184
Simon Wunderlich89652332013-11-13 19:14:46 +0100185 router_ifinfo = batadv_neigh_ifinfo_get(router,
186 BATADV_IF_DEFAULT);
187 if (!router_ifinfo)
188 goto next;
189
Sven Eckelmanne7aed322016-01-16 10:29:41 +0100190 if (!kref_get_unless_zero(&gw_node->refcount))
Antonio Quartulli2265c142011-04-27 00:22:00 +0200191 goto next;
192
Simon Wunderlich89652332013-11-13 19:14:46 +0100193 tq_avg = router_ifinfo->bat_iv.tq_avg;
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200194
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000195 switch (atomic_read(&bat_priv->gw_sel_class)) {
196 case 1: /* fast connection */
Marek Lindner414254e2013-04-23 21:39:58 +0800197 tmp_gw_factor = tq_avg * tq_avg;
198 tmp_gw_factor *= gw_node->bandwidth_down;
199 tmp_gw_factor *= 100 * 100;
Sven Eckelmanne071d932015-06-22 09:13:23 +0200200 tmp_gw_factor >>= 18;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000201
202 if ((tmp_gw_factor > max_gw_factor) ||
203 ((tmp_gw_factor == max_gw_factor) &&
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200204 (tq_avg > max_tq))) {
Antonio Quartulli2265c142011-04-27 00:22:00 +0200205 if (curr_gw)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100206 batadv_gw_node_put(curr_gw);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200207 curr_gw = gw_node;
Sven Eckelmanne7aed322016-01-16 10:29:41 +0100208 kref_get(&curr_gw->refcount);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200209 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000210 break;
211
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200212 default: /* 2: stable connection (use best statistic)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000213 * 3: fast-switch (use best statistic but change as
214 * soon as a better gateway appears)
215 * XX: late-switch (use best statistic but change as
216 * soon as a better gateway appears which has
217 * $routing_class more tq points)
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200218 */
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200219 if (tq_avg > max_tq) {
Antonio Quartulli2265c142011-04-27 00:22:00 +0200220 if (curr_gw)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100221 batadv_gw_node_put(curr_gw);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200222 curr_gw = gw_node;
Sven Eckelmanne7aed322016-01-16 10:29:41 +0100223 kref_get(&curr_gw->refcount);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200224 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000225 break;
226 }
227
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200228 if (tq_avg > max_tq)
229 max_tq = tq_avg;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000230
231 if (tmp_gw_factor > max_gw_factor)
232 max_gw_factor = tmp_gw_factor;
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000233
Sven Eckelmann3a017432016-01-17 11:01:18 +0100234 batadv_gw_node_put(gw_node);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200235
236next:
Sven Eckelmann25bb2502016-01-17 11:01:11 +0100237 batadv_neigh_node_put(router);
Simon Wunderlich89652332013-11-13 19:14:46 +0100238 if (router_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +0100239 batadv_neigh_ifinfo_put(router_ifinfo);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000240 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000241 rcu_read_unlock();
Antonio Quartulli2265c142011-04-27 00:22:00 +0200242
243 return curr_gw;
244}
245
Antonio Quartullic6eaa3f2013-07-13 00:06:00 +0200246/**
247 * batadv_gw_check_client_stop - check if client mode has been switched off
248 * @bat_priv: the bat priv with all the soft interface information
249 *
250 * This function assumes the caller has checked that the gw state *is actually
251 * changing*. This function is not supposed to be called when there is no state
252 * change.
253 */
254void batadv_gw_check_client_stop(struct batadv_priv *bat_priv)
255{
256 struct batadv_gw_node *curr_gw;
257
258 if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT)
259 return;
260
261 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
262 if (!curr_gw)
263 return;
264
Antonio Quartullif3163182013-11-04 20:59:40 +0100265 /* deselect the current gateway so that next time that client mode is
266 * enabled a proper GW_ADD event can be sent
267 */
268 batadv_gw_select(bat_priv, NULL);
269
Antonio Quartullic6eaa3f2013-07-13 00:06:00 +0200270 /* if batman-adv is switching the gw client mode off and a gateway was
271 * already selected, send a DEL uevent
272 */
273 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL);
274
Sven Eckelmann3a017432016-01-17 11:01:18 +0100275 batadv_gw_node_put(curr_gw);
Antonio Quartullic6eaa3f2013-07-13 00:06:00 +0200276}
277
Sven Eckelmann56303d32012-06-05 22:31:31 +0200278void batadv_gw_election(struct batadv_priv *bat_priv)
Antonio Quartulli2265c142011-04-27 00:22:00 +0200279{
Sven Eckelmann4f248cf2015-06-09 20:50:49 +0200280 struct batadv_gw_node *curr_gw = NULL;
281 struct batadv_gw_node *next_gw = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200282 struct batadv_neigh_node *router = NULL;
Simon Wunderlich89652332013-11-13 19:14:46 +0100283 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
Antonio Quartulli19595e02011-06-12 11:58:58 +0200284 char gw_addr[18] = { '\0' };
Antonio Quartulli2265c142011-04-27 00:22:00 +0200285
Sven Eckelmanncd646ab2012-06-03 22:19:18 +0200286 if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT)
Antonio Quartulli2265c142011-04-27 00:22:00 +0200287 goto out;
288
Sven Eckelmann1409a832012-05-12 18:33:55 +0200289 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200290
Sven Eckelmann807736f2012-07-15 22:26:51 +0200291 if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw)
Marek Lindnercaa0bf62012-08-04 04:13:26 +0000292 goto out;
293
Sven Eckelmann1409a832012-05-12 18:33:55 +0200294 next_gw = batadv_gw_get_best_gw_node(bat_priv);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200295
296 if (curr_gw == next_gw)
297 goto out;
298
299 if (next_gw) {
Antonio Quartulli19595e02011-06-12 11:58:58 +0200300 sprintf(gw_addr, "%pM", next_gw->orig_node->orig);
301
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100302 router = batadv_orig_router_get(next_gw->orig_node,
303 BATADV_IF_DEFAULT);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200304 if (!router) {
Antonio Quartulli4e820e72013-11-04 20:59:41 +0100305 batadv_gw_reselect(bat_priv);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200306 goto out;
307 }
Simon Wunderlich89652332013-11-13 19:14:46 +0100308
309 router_ifinfo = batadv_neigh_ifinfo_get(router,
310 BATADV_IF_DEFAULT);
311 if (!router_ifinfo) {
312 batadv_gw_reselect(bat_priv);
313 goto out;
314 }
Antonio Quartulli2265c142011-04-27 00:22:00 +0200315 }
316
317 if ((curr_gw) && (!next_gw)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200318 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200319 "Removing selected gateway - no gateway in range\n");
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200320 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL,
321 NULL);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200322 } else if ((!curr_gw) && (next_gw)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200323 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Marek Lindner414254e2013-04-23 21:39:58 +0800324 "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200325 next_gw->orig_node->orig,
Marek Lindner414254e2013-04-23 21:39:58 +0800326 next_gw->bandwidth_down / 10,
327 next_gw->bandwidth_down % 10,
328 next_gw->bandwidth_up / 10,
Simon Wunderlich89652332013-11-13 19:14:46 +0100329 next_gw->bandwidth_up % 10,
330 router_ifinfo->bat_iv.tq_avg);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200331 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD,
332 gw_addr);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200333 } else {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200334 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Marek Lindner414254e2013-04-23 21:39:58 +0800335 "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200336 next_gw->orig_node->orig,
Marek Lindner414254e2013-04-23 21:39:58 +0800337 next_gw->bandwidth_down / 10,
338 next_gw->bandwidth_down % 10,
339 next_gw->bandwidth_up / 10,
Simon Wunderlich89652332013-11-13 19:14:46 +0100340 next_gw->bandwidth_up % 10,
341 router_ifinfo->bat_iv.tq_avg);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200342 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE,
343 gw_addr);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200344 }
345
Sven Eckelmann1409a832012-05-12 18:33:55 +0200346 batadv_gw_select(bat_priv, next_gw);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200347
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100348out:
349 if (curr_gw)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100350 batadv_gw_node_put(curr_gw);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200351 if (next_gw)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100352 batadv_gw_node_put(next_gw);
Antonio Quartulli2265c142011-04-27 00:22:00 +0200353 if (router)
Sven Eckelmann25bb2502016-01-17 11:01:11 +0100354 batadv_neigh_node_put(router);
Simon Wunderlich89652332013-11-13 19:14:46 +0100355 if (router_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +0100356 batadv_neigh_ifinfo_put(router_ifinfo);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000357}
358
Sven Eckelmann56303d32012-06-05 22:31:31 +0200359void batadv_gw_check_election(struct batadv_priv *bat_priv,
360 struct batadv_orig_node *orig_node)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000361{
Simon Wunderlich89652332013-11-13 19:14:46 +0100362 struct batadv_neigh_ifinfo *router_orig_tq = NULL;
363 struct batadv_neigh_ifinfo *router_gw_tq = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200364 struct batadv_orig_node *curr_gw_orig;
Sven Eckelmann4f248cf2015-06-09 20:50:49 +0200365 struct batadv_neigh_node *router_gw = NULL;
366 struct batadv_neigh_node *router_orig = NULL;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200367 u8 gw_tq_avg, orig_tq_avg;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000368
Sven Eckelmann7cf06bc2012-05-12 02:09:29 +0200369 curr_gw_orig = batadv_gw_get_selected_orig(bat_priv);
Linus Lüssing57f0c072011-03-14 22:43:33 +0000370 if (!curr_gw_orig)
Antonio Quartulli4e820e72013-11-04 20:59:41 +0100371 goto reselect;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000372
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100373 router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000374 if (!router_gw)
Antonio Quartulli4e820e72013-11-04 20:59:41 +0100375 goto reselect;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000376
Simon Wunderlich89652332013-11-13 19:14:46 +0100377 router_gw_tq = batadv_neigh_ifinfo_get(router_gw,
378 BATADV_IF_DEFAULT);
379 if (!router_gw_tq)
380 goto reselect;
381
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000382 /* this node already is the gateway */
Linus Lüssing57f0c072011-03-14 22:43:33 +0000383 if (curr_gw_orig == orig_node)
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000384 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000385
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100386 router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000387 if (!router_orig)
388 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000389
Simon Wunderlich89652332013-11-13 19:14:46 +0100390 router_orig_tq = batadv_neigh_ifinfo_get(router_orig,
391 BATADV_IF_DEFAULT);
392 if (!router_orig_tq)
393 goto out;
394
395 gw_tq_avg = router_gw_tq->bat_iv.tq_avg;
396 orig_tq_avg = router_orig_tq->bat_iv.tq_avg;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000397
398 /* the TQ value has to be better */
399 if (orig_tq_avg < gw_tq_avg)
Linus Lüssing5d02b3c2011-02-13 21:13:02 +0000400 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000401
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200402 /* if the routing class is greater than 3 the value tells us how much
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000403 * greater the TQ value of the new gateway must be
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200404 */
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000405 if ((atomic_read(&bat_priv->gw_sel_class) > 3) &&
406 (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class)))
Linus Lüssing5d02b3c2011-02-13 21:13:02 +0000407 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000408
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200409 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200410 "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n",
411 gw_tq_avg, orig_tq_avg);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000412
Antonio Quartulli4e820e72013-11-04 20:59:41 +0100413reselect:
414 batadv_gw_reselect(bat_priv);
Linus Lüssing5d02b3c2011-02-13 21:13:02 +0000415out:
Linus Lüssing57f0c072011-03-14 22:43:33 +0000416 if (curr_gw_orig)
Sven Eckelmann5d967312016-01-17 11:01:09 +0100417 batadv_orig_node_put(curr_gw_orig);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000418 if (router_gw)
Sven Eckelmann25bb2502016-01-17 11:01:11 +0100419 batadv_neigh_node_put(router_gw);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000420 if (router_orig)
Sven Eckelmann25bb2502016-01-17 11:01:11 +0100421 batadv_neigh_node_put(router_orig);
Simon Wunderlich89652332013-11-13 19:14:46 +0100422 if (router_gw_tq)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +0100423 batadv_neigh_ifinfo_put(router_gw_tq);
Simon Wunderlich89652332013-11-13 19:14:46 +0100424 if (router_orig_tq)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +0100425 batadv_neigh_ifinfo_put(router_orig_tq);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000426}
427
Marek Lindner414254e2013-04-23 21:39:58 +0800428/**
429 * batadv_gw_node_add - add gateway node to list of available gateways
430 * @bat_priv: the bat priv with all the soft interface information
431 * @orig_node: originator announcing gateway capabilities
432 * @gateway: announced bandwidth information
433 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200434static void batadv_gw_node_add(struct batadv_priv *bat_priv,
435 struct batadv_orig_node *orig_node,
Marek Lindner414254e2013-04-23 21:39:58 +0800436 struct batadv_tvlv_gateway_data *gateway)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000437{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200438 struct batadv_gw_node *gw_node;
Marek Lindner414254e2013-04-23 21:39:58 +0800439
440 if (gateway->bandwidth_down == 0)
441 return;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000442
Antonio Quartulli377fe0f2014-05-02 01:35:13 +0200443 gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC);
Sven Eckelmannc3ba37a72016-03-05 16:09:23 +0100444 if (!gw_node)
Antonio Quartulli377fe0f2014-05-02 01:35:13 +0200445 return;
Antonio Quartulli377fe0f2014-05-02 01:35:13 +0200446
Sven Eckelmannc3ba37a72016-03-05 16:09:23 +0100447 kref_get(&orig_node->refcount);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000448 INIT_HLIST_NODE(&gw_node->list);
449 gw_node->orig_node = orig_node;
Simon Wunderlich27a4d5e2015-06-24 14:50:19 +0200450 gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
451 gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
Sven Eckelmanne7aed322016-01-16 10:29:41 +0100452 kref_init(&gw_node->refcount);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000453
Sven Eckelmann807736f2012-07-15 22:26:51 +0200454 spin_lock_bh(&bat_priv->gw.list_lock);
455 hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list);
456 spin_unlock_bh(&bat_priv->gw.list_lock);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000457
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200458 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Marek Lindner414254e2013-04-23 21:39:58 +0800459 "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n",
460 orig_node->orig,
461 ntohl(gateway->bandwidth_down) / 10,
462 ntohl(gateway->bandwidth_down) % 10,
463 ntohl(gateway->bandwidth_up) / 10,
464 ntohl(gateway->bandwidth_up) % 10);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000465}
466
Marek Lindner414254e2013-04-23 21:39:58 +0800467/**
468 * batadv_gw_node_get - retrieve gateway node from list of available gateways
469 * @bat_priv: the bat priv with all the soft interface information
470 * @orig_node: originator announcing gateway capabilities
471 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200472 * Return: gateway node if found or NULL otherwise.
Marek Lindner414254e2013-04-23 21:39:58 +0800473 */
474static struct batadv_gw_node *
475batadv_gw_node_get(struct batadv_priv *bat_priv,
476 struct batadv_orig_node *orig_node)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000477{
Marek Lindner414254e2013-04-23 21:39:58 +0800478 struct batadv_gw_node *gw_node_tmp, *gw_node = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000479
480 rcu_read_lock();
Marek Lindner414254e2013-04-23 21:39:58 +0800481 hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) {
482 if (gw_node_tmp->orig_node != orig_node)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000483 continue;
484
Sven Eckelmanne7aed322016-01-16 10:29:41 +0100485 if (!kref_get_unless_zero(&gw_node_tmp->refcount))
Marek Lindner414254e2013-04-23 21:39:58 +0800486 continue;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000487
Marek Lindner414254e2013-04-23 21:39:58 +0800488 gw_node = gw_node_tmp;
489 break;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000490 }
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100491 rcu_read_unlock();
Antonio Quartulli71e4aa92011-04-25 22:44:32 +0200492
Marek Lindner414254e2013-04-23 21:39:58 +0800493 return gw_node;
494}
495
496/**
497 * batadv_gw_node_update - update list of available gateways with changed
498 * bandwidth information
499 * @bat_priv: the bat priv with all the soft interface information
500 * @orig_node: originator announcing gateway capabilities
501 * @gateway: announced bandwidth information
502 */
503void batadv_gw_node_update(struct batadv_priv *bat_priv,
504 struct batadv_orig_node *orig_node,
505 struct batadv_tvlv_gateway_data *gateway)
506{
507 struct batadv_gw_node *gw_node, *curr_gw = NULL;
508
509 gw_node = batadv_gw_node_get(bat_priv, orig_node);
510 if (!gw_node) {
511 batadv_gw_node_add(bat_priv, orig_node, gateway);
512 goto out;
513 }
514
515 if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) &&
516 (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up)))
517 goto out;
518
519 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
520 "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n",
521 orig_node->orig,
522 gw_node->bandwidth_down / 10,
523 gw_node->bandwidth_down % 10,
524 gw_node->bandwidth_up / 10,
525 gw_node->bandwidth_up % 10,
526 ntohl(gateway->bandwidth_down) / 10,
527 ntohl(gateway->bandwidth_down) % 10,
528 ntohl(gateway->bandwidth_up) / 10,
529 ntohl(gateway->bandwidth_up) % 10);
530
531 gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
532 gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
533
Marek Lindner414254e2013-04-23 21:39:58 +0800534 if (ntohl(gateway->bandwidth_down) == 0) {
Marek Lindner414254e2013-04-23 21:39:58 +0800535 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
536 "Gateway %pM removed from gateway list\n",
537 orig_node->orig);
538
539 /* Note: We don't need a NULL check here, since curr_gw never
540 * gets dereferenced.
541 */
Simon Wunderlichbd3524c2015-08-03 19:13:58 +0200542 spin_lock_bh(&bat_priv->gw.list_lock);
Sven Eckelmannc18bdd02016-01-31 13:27:59 +0100543 if (!hlist_unhashed(&gw_node->list)) {
544 hlist_del_init_rcu(&gw_node->list);
Sven Eckelmann3a017432016-01-17 11:01:18 +0100545 batadv_gw_node_put(gw_node);
Sven Eckelmannc18bdd02016-01-31 13:27:59 +0100546 }
Simon Wunderlichbd3524c2015-08-03 19:13:58 +0200547 spin_unlock_bh(&bat_priv->gw.list_lock);
548
Marek Lindner414254e2013-04-23 21:39:58 +0800549 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
550 if (gw_node == curr_gw)
Antonio Quartulli4e820e72013-11-04 20:59:41 +0100551 batadv_gw_reselect(bat_priv);
Simon Wunderlichbd3524c2015-08-03 19:13:58 +0200552
553 if (curr_gw)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100554 batadv_gw_node_put(curr_gw);
Marek Lindner414254e2013-04-23 21:39:58 +0800555 }
556
557out:
Marek Lindner414254e2013-04-23 21:39:58 +0800558 if (gw_node)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100559 batadv_gw_node_put(gw_node);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000560}
561
Sven Eckelmann56303d32012-06-05 22:31:31 +0200562void batadv_gw_node_delete(struct batadv_priv *bat_priv,
563 struct batadv_orig_node *orig_node)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000564{
Marek Lindner414254e2013-04-23 21:39:58 +0800565 struct batadv_tvlv_gateway_data gateway;
566
567 gateway.bandwidth_down = 0;
568 gateway.bandwidth_up = 0;
569
570 batadv_gw_node_update(bat_priv, orig_node, &gateway);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000571}
572
Simon Wunderlichbd3524c2015-08-03 19:13:58 +0200573void batadv_gw_node_free(struct batadv_priv *bat_priv)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000574{
Simon Wunderlichbd3524c2015-08-03 19:13:58 +0200575 struct batadv_gw_node *gw_node;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800576 struct hlist_node *node_tmp;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000577
Sven Eckelmann807736f2012-07-15 22:26:51 +0200578 spin_lock_bh(&bat_priv->gw.list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800579 hlist_for_each_entry_safe(gw_node, node_tmp,
Sven Eckelmann807736f2012-07-15 22:26:51 +0200580 &bat_priv->gw.list, list) {
Simon Wunderlichbd3524c2015-08-03 19:13:58 +0200581 hlist_del_init_rcu(&gw_node->list);
Sven Eckelmann3a017432016-01-17 11:01:18 +0100582 batadv_gw_node_put(gw_node);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000583 }
Sven Eckelmann807736f2012-07-15 22:26:51 +0200584 spin_unlock_bh(&bat_priv->gw.list_lock);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000585}
586
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200587/* fails if orig_node has no router */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200588static int batadv_write_buffer_text(struct batadv_priv *bat_priv,
589 struct seq_file *seq,
590 const struct batadv_gw_node *gw_node)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000591{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200592 struct batadv_gw_node *curr_gw;
593 struct batadv_neigh_node *router;
Simon Wunderlich89652332013-11-13 19:14:46 +0100594 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
Marek Lindner414254e2013-04-23 21:39:58 +0800595 int ret = -1;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000596
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100597 router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000598 if (!router)
599 goto out;
600
Simon Wunderlich89652332013-11-13 19:14:46 +0100601 router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
602 if (!router_ifinfo)
603 goto out;
604
Sven Eckelmann1409a832012-05-12 18:33:55 +0200605 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
Linus Lüssing5d02b3c2011-02-13 21:13:02 +0000606
Joe Perches6d911472015-02-16 17:31:39 -0800607 seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n",
608 (curr_gw == gw_node ? "=>" : " "),
609 gw_node->orig_node->orig,
610 router_ifinfo->bat_iv.tq_avg, router->addr,
611 router->if_incoming->net_dev->name,
612 gw_node->bandwidth_down / 10,
613 gw_node->bandwidth_down % 10,
614 gw_node->bandwidth_up / 10,
615 gw_node->bandwidth_up % 10);
Joe Perches92b83912015-02-22 13:47:56 -0800616 ret = seq_has_overflowed(seq) ? -1 : 0;
Linus Lüssing5d02b3c2011-02-13 21:13:02 +0000617
Marek Lindnerc4aac1a2011-03-23 11:24:34 +0100618 if (curr_gw)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100619 batadv_gw_node_put(curr_gw);
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000620out:
Simon Wunderlich89652332013-11-13 19:14:46 +0100621 if (router_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +0100622 batadv_neigh_ifinfo_put(router_ifinfo);
Simon Wunderlich89652332013-11-13 19:14:46 +0100623 if (router)
Sven Eckelmann25bb2502016-01-17 11:01:11 +0100624 batadv_neigh_node_put(router);
Linus Lüssing5d02b3c2011-02-13 21:13:02 +0000625 return ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000626}
627
Sven Eckelmann7cf06bc2012-05-12 02:09:29 +0200628int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000629{
630 struct net_device *net_dev = (struct net_device *)seq->private;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200631 struct batadv_priv *bat_priv = netdev_priv(net_dev);
632 struct batadv_hard_iface *primary_if;
633 struct batadv_gw_node *gw_node;
Marek Lindner30da63a2012-08-03 17:15:46 +0200634 int gw_count = 0;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000635
Marek Lindner30da63a2012-08-03 17:15:46 +0200636 primary_if = batadv_seq_print_text_primary_if_get(seq);
637 if (!primary_if)
Marek Lindner32ae9b22011-04-20 15:40:58 +0200638 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000639
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100640 seq_printf(seq,
Marek Lindner414254e2013-04-23 21:39:58 +0800641 " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n",
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200642 "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF",
643 BATADV_SOURCE_VERSION, primary_if->net_dev->name,
Marek Lindner32ae9b22011-04-20 15:40:58 +0200644 primary_if->net_dev->dev_addr, net_dev->name);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000645
646 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800647 hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000648 /* fails if orig_node has no router */
Sven Eckelmann1409a832012-05-12 18:33:55 +0200649 if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000650 continue;
651
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000652 gw_count++;
653 }
654 rcu_read_unlock();
655
656 if (gw_count == 0)
Antonio Quartulli0c814652013-03-21 09:23:29 +0100657 seq_puts(seq, "No gateways in range ...\n");
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000658
Marek Lindner32ae9b22011-04-20 15:40:58 +0200659out:
660 if (primary_if)
Sven Eckelmann82047ad2016-01-17 11:01:10 +0100661 batadv_hardif_put(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +0200662 return 0;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000663}
664
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100665/**
666 * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message
667 * @skb: the packet to check
668 * @header_len: a pointer to the batman-adv header size
669 * @chaddr: buffer where the client address will be stored. Valid
670 * only if the function returns BATADV_DHCP_TO_CLIENT
671 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200672 * This function may re-allocate the data buffer of the skb passed as argument.
673 *
674 * Return:
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100675 * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error
676 * while parsing it
677 * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server
678 * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100679 */
680enum batadv_dhcp_recipient
681batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200682 u8 *chaddr)
Antonio Quartulli43676ab2011-04-26 21:31:45 +0200683{
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100684 enum batadv_dhcp_recipient ret = BATADV_DHCP_NO;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000685 struct ethhdr *ethhdr;
686 struct iphdr *iphdr;
687 struct ipv6hdr *ipv6hdr;
688 struct udphdr *udphdr;
Antonio Quartullif7f8ed52013-05-12 21:51:15 +0200689 struct vlan_ethhdr *vhdr;
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100690 int chaddr_offset;
Antonio Quartullif7f8ed52013-05-12 21:51:15 +0200691 __be16 proto;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200692 u8 *p;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000693
694 /* check for ethernet header */
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200695 if (!pskb_may_pull(skb, *header_len + ETH_HLEN))
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100696 return BATADV_DHCP_NO;
697
Linus Lüssing927c2ed2014-01-19 22:22:45 +0100698 ethhdr = eth_hdr(skb);
Antonio Quartullif7f8ed52013-05-12 21:51:15 +0200699 proto = ethhdr->h_proto;
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200700 *header_len += ETH_HLEN;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000701
702 /* check for initial vlan header */
Antonio Quartullif7f8ed52013-05-12 21:51:15 +0200703 if (proto == htons(ETH_P_8021Q)) {
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200704 if (!pskb_may_pull(skb, *header_len + VLAN_HLEN))
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100705 return BATADV_DHCP_NO;
Antonio Quartullif7f8ed52013-05-12 21:51:15 +0200706
Linus Lüssing927c2ed2014-01-19 22:22:45 +0100707 vhdr = vlan_eth_hdr(skb);
Antonio Quartullif7f8ed52013-05-12 21:51:15 +0200708 proto = vhdr->h_vlan_encapsulated_proto;
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200709 *header_len += VLAN_HLEN;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000710 }
711
712 /* check for ip header */
Antonio Quartullif7f8ed52013-05-12 21:51:15 +0200713 switch (proto) {
714 case htons(ETH_P_IP):
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200715 if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr)))
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100716 return BATADV_DHCP_NO;
717
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200718 iphdr = (struct iphdr *)(skb->data + *header_len);
719 *header_len += iphdr->ihl * 4;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000720
721 /* check for udp header */
722 if (iphdr->protocol != IPPROTO_UDP)
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100723 return BATADV_DHCP_NO;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000724
725 break;
Antonio Quartullif7f8ed52013-05-12 21:51:15 +0200726 case htons(ETH_P_IPV6):
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200727 if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr)))
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100728 return BATADV_DHCP_NO;
729
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200730 ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len);
731 *header_len += sizeof(*ipv6hdr);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000732
733 /* check for udp header */
734 if (ipv6hdr->nexthdr != IPPROTO_UDP)
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100735 return BATADV_DHCP_NO;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000736
737 break;
738 default:
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100739 return BATADV_DHCP_NO;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000740 }
741
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200742 if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr)))
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100743 return BATADV_DHCP_NO;
Linus Lüssing9d2c9482013-08-06 20:21:15 +0200744
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200745 udphdr = (struct udphdr *)(skb->data + *header_len);
746 *header_len += sizeof(*udphdr);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000747
748 /* check for bootp port */
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100749 switch (proto) {
750 case htons(ETH_P_IP):
751 if (udphdr->dest == htons(67))
752 ret = BATADV_DHCP_TO_SERVER;
753 else if (udphdr->source == htons(67))
754 ret = BATADV_DHCP_TO_CLIENT;
755 break;
756 case htons(ETH_P_IPV6):
757 if (udphdr->dest == htons(547))
758 ret = BATADV_DHCP_TO_SERVER;
759 else if (udphdr->source == htons(547))
760 ret = BATADV_DHCP_TO_CLIENT;
761 break;
762 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000763
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100764 chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET;
765 /* store the client address if the message is going to a client */
766 if (ret == BATADV_DHCP_TO_CLIENT &&
767 pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) {
768 /* check if the DHCP packet carries an Ethernet DHCP */
769 p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET;
770 if (*p != BATADV_DHCP_HTYPE_ETHERNET)
771 return BATADV_DHCP_NO;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000772
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100773 /* check if the DHCP packet carries a valid Ethernet address */
774 p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET;
775 if (*p != ETH_ALEN)
776 return BATADV_DHCP_NO;
777
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100778 ether_addr_copy(chaddr, skb->data + chaddr_offset);
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100779 }
780
781 return ret;
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200782}
Antonio Quartulliaa143d22014-09-01 14:37:27 +0200783
Antonio Quartullibbb877e2013-06-04 12:11:42 +0200784/**
785 * batadv_gw_out_of_range - check if the dhcp request destination is the best gw
786 * @bat_priv: the bat priv with all the soft interface information
787 * @skb: the outgoing packet
788 *
789 * Check if the skb is a DHCP request and if it is sent to the current best GW
790 * server. Due to topology changes it may be the case that the GW server
791 * previously selected is not the best one anymore.
792 *
Antonio Quartullibbb877e2013-06-04 12:11:42 +0200793 * This call might reallocate skb data.
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100794 * Must be invoked only when the DHCP packet is going TO a DHCP SERVER.
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200795 *
796 * Return: true if the packet destination is unicast and it is not the best gw,
797 * false otherwise.
Antonio Quartullibbb877e2013-06-04 12:11:42 +0200798 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200799bool batadv_gw_out_of_range(struct batadv_priv *bat_priv,
Linus Lüssing9d2c9482013-08-06 20:21:15 +0200800 struct sk_buff *skb)
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200801{
Sven Eckelmann4f248cf2015-06-09 20:50:49 +0200802 struct batadv_neigh_node *neigh_curr = NULL;
803 struct batadv_neigh_node *neigh_old = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200804 struct batadv_orig_node *orig_dst_node = NULL;
Sven Eckelmann4f248cf2015-06-09 20:50:49 +0200805 struct batadv_gw_node *gw_node = NULL;
806 struct batadv_gw_node *curr_gw = NULL;
Simon Wunderlich89652332013-11-13 19:14:46 +0100807 struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo;
Antonio Quartulli6c413b12013-11-05 19:31:08 +0100808 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
809 bool out_of_range = false;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200810 u8 curr_tq_avg;
Antonio Quartullibbb877e2013-06-04 12:11:42 +0200811 unsigned short vid;
812
813 vid = batadv_get_vid(skb, 0);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000814
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200815 orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
Antonio Quartullibbb877e2013-06-04 12:11:42 +0200816 ethhdr->h_dest, vid);
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200817 if (!orig_dst_node)
818 goto out;
819
Marek Lindner414254e2013-04-23 21:39:58 +0800820 gw_node = batadv_gw_node_get(bat_priv, orig_dst_node);
Antonio Quartulli0d164492014-12-20 13:48:57 +0100821 if (!gw_node)
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200822 goto out;
823
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200824 switch (atomic_read(&bat_priv->gw_mode)) {
Sven Eckelmanncd646ab2012-06-03 22:19:18 +0200825 case BATADV_GW_MODE_SERVER:
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200826 /* If we are a GW then we are our best GW. We can artificially
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200827 * set the tq towards ourself as the maximum value
828 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200829 curr_tq_avg = BATADV_TQ_MAX_VALUE;
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200830 break;
Sven Eckelmanncd646ab2012-06-03 22:19:18 +0200831 case BATADV_GW_MODE_CLIENT:
Sven Eckelmann1409a832012-05-12 18:33:55 +0200832 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200833 if (!curr_gw)
834 goto out;
835
836 /* packet is going to our gateway */
837 if (curr_gw->orig_node == orig_dst_node)
838 goto out;
839
840 /* If the dhcp packet has been sent to a different gw,
841 * we have to evaluate whether the old gw is still
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200842 * reliable enough
843 */
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200844 neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node,
845 NULL);
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200846 if (!neigh_curr)
847 goto out;
848
Simon Wunderlich89652332013-11-13 19:14:46 +0100849 curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr,
850 BATADV_IF_DEFAULT);
851 if (!curr_ifinfo)
852 goto out;
853
854 curr_tq_avg = curr_ifinfo->bat_iv.tq_avg;
Sven Eckelmann044fa3a2016-01-17 11:01:12 +0100855 batadv_neigh_ifinfo_put(curr_ifinfo);
Simon Wunderlich89652332013-11-13 19:14:46 +0100856
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200857 break;
Sven Eckelmanncd646ab2012-06-03 22:19:18 +0200858 case BATADV_GW_MODE_OFF:
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200859 default:
860 goto out;
Antonio Quartulli43676ab2011-04-26 21:31:45 +0200861 }
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200862
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200863 neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL);
Dan Carpenter2ef04f42011-11-29 09:09:09 +0300864 if (!neigh_old)
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200865 goto out;
866
Simon Wunderlich89652332013-11-13 19:14:46 +0100867 old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT);
868 if (!old_ifinfo)
869 goto out;
870
871 if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD)
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200872 out_of_range = true;
Sven Eckelmann044fa3a2016-01-17 11:01:12 +0100873 batadv_neigh_ifinfo_put(old_ifinfo);
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200874
875out:
876 if (orig_dst_node)
Sven Eckelmann5d967312016-01-17 11:01:09 +0100877 batadv_orig_node_put(orig_dst_node);
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200878 if (curr_gw)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100879 batadv_gw_node_put(curr_gw);
Marek Lindner414254e2013-04-23 21:39:58 +0800880 if (gw_node)
Sven Eckelmann3a017432016-01-17 11:01:18 +0100881 batadv_gw_node_put(gw_node);
Antonio Quartulli43676ab2011-04-26 21:31:45 +0200882 if (neigh_old)
Sven Eckelmann25bb2502016-01-17 11:01:11 +0100883 batadv_neigh_node_put(neigh_old);
Antonio Quartulli43676ab2011-04-26 21:31:45 +0200884 if (neigh_curr)
Sven Eckelmann25bb2502016-01-17 11:01:11 +0100885 batadv_neigh_node_put(neigh_curr);
Marek Lindnerbe7af5c2011-09-08 13:12:53 +0200886 return out_of_range;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000887}