blob: cb2d1b9b034058c454fa0b7c5c14e6491ed41b1d [file] [log] [blame]
Sven Eckelmann0046b042016-01-01 00:01:03 +01001/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors:
Marek Lindnerfc957272011-07-30 12:04:12 +02002 *
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/>.
Marek Lindnerfc957272011-07-30 12:04:12 +020016 */
17
Marek Lindner1c280472011-11-28 17:40:17 +080018#include "bat_algo.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020019#include "main.h"
20
21#include <linux/atomic.h>
22#include <linux/bitmap.h>
23#include <linux/bitops.h>
24#include <linux/bug.h>
25#include <linux/byteorder/generic.h>
26#include <linux/cache.h>
27#include <linux/errno.h>
28#include <linux/etherdevice.h>
29#include <linux/fs.h>
30#include <linux/if_ether.h>
31#include <linux/init.h>
32#include <linux/jiffies.h>
33#include <linux/list.h>
Sven Eckelmann77ae32e2016-01-16 10:29:53 +010034#include <linux/kref.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020035#include <linux/netdevice.h>
36#include <linux/pkt_sched.h>
37#include <linux/printk.h>
38#include <linux/random.h>
39#include <linux/rculist.h>
40#include <linux/rcupdate.h>
41#include <linux/seq_file.h>
42#include <linux/skbuff.h>
43#include <linux/slab.h>
44#include <linux/spinlock.h>
45#include <linux/stddef.h>
46#include <linux/string.h>
47#include <linux/types.h>
48#include <linux/workqueue.h>
49
50#include "bitarray.h"
51#include "hard-interface.h"
52#include "hash.h"
Martin Hundebølld56b1702013-01-25 11:12:39 +010053#include "network-coding.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020054#include "originator.h"
55#include "packet.h"
56#include "routing.h"
57#include "send.h"
58#include "translation-table.h"
Marek Lindnerfc957272011-07-30 12:04:12 +020059
Antonio Quartulli791c2a22013-08-17 12:44:44 +020060/**
Martin Hundebøll95298a92014-07-15 09:41:05 +020061 * enum batadv_dup_status - duplicate status
Markus Pargmann9f52ee12014-12-26 12:41:34 +010062 * @BATADV_NO_DUP: the packet is no duplicate
Antonio Quartulli791c2a22013-08-17 12:44:44 +020063 * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
64 * neighbor)
65 * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
66 * @BATADV_PROTECTED: originator is currently protected (after reboot)
67 */
68enum batadv_dup_status {
69 BATADV_NO_DUP = 0,
70 BATADV_ORIG_DUP,
71 BATADV_NEIGH_DUP,
72 BATADV_PROTECTED,
73};
74
Antonio Quartulli24a5dee2013-04-08 09:38:12 +020075/**
76 * batadv_ring_buffer_set - update the ring buffer with the given value
77 * @lq_recv: pointer to the ring buffer
78 * @lq_index: index to store the value at
79 * @value: value to store in the ring buffer
80 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020081static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value)
Antonio Quartulli24a5dee2013-04-08 09:38:12 +020082{
83 lq_recv[*lq_index] = value;
84 *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
85}
86
87/**
Markus Pargmannd491dbb2014-12-26 12:41:36 +010088 * batadv_ring_buffer_avg - compute the average of all non-zero values stored
Antonio Quartulli24a5dee2013-04-08 09:38:12 +020089 * in the given ring buffer
90 * @lq_recv: pointer to the ring buffer
91 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +020092 * Return: computed average value.
Antonio Quartulli24a5dee2013-04-08 09:38:12 +020093 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020094static u8 batadv_ring_buffer_avg(const u8 lq_recv[])
Antonio Quartulli24a5dee2013-04-08 09:38:12 +020095{
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020096 const u8 *ptr;
97 u16 count = 0;
98 u16 i = 0;
99 u16 sum = 0;
Antonio Quartulli24a5dee2013-04-08 09:38:12 +0200100
101 ptr = lq_recv;
102
103 while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
104 if (*ptr != 0) {
105 count++;
106 sum += *ptr;
107 }
108
109 i++;
110 ptr++;
111 }
112
113 if (count == 0)
114 return 0;
115
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200116 return (u8)(sum / count);
Antonio Quartulli24a5dee2013-04-08 09:38:12 +0200117}
David S. Millerd98cae64e2013-06-19 16:49:39 -0700118
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200119/**
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200120 * batadv_iv_ogm_orig_free - free the private resources allocated for this
121 * orig_node
122 * @orig_node: the orig_node for which the resources have to be free'd
123 */
124static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
125{
126 kfree(orig_node->bat_iv.bcast_own);
127 kfree(orig_node->bat_iv.bcast_own_sum);
128}
129
130/**
131 * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
132 * include the new hard-interface
133 * @orig_node: the orig_node that has to be changed
134 * @max_if_num: the current amount of interfaces
135 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200136 * Return: 0 on success, a negative error code otherwise.
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200137 */
138static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
139 int max_if_num)
140{
141 void *data_ptr;
Antonio Quartulli0185dda2014-05-24 06:43:47 +0200142 size_t old_size;
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200143 int ret = -ENOMEM;
144
145 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
146
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200147 old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
Antonio Quartulli0185dda2014-05-24 06:43:47 +0200148 data_ptr = kmalloc_array(max_if_num,
149 BATADV_NUM_WORDS * sizeof(unsigned long),
150 GFP_ATOMIC);
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200151 if (!data_ptr)
152 goto unlock;
153
154 memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
155 kfree(orig_node->bat_iv.bcast_own);
156 orig_node->bat_iv.bcast_own = data_ptr;
157
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200158 data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200159 if (!data_ptr) {
160 kfree(orig_node->bat_iv.bcast_own);
161 goto unlock;
162 }
163
164 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200165 (max_if_num - 1) * sizeof(u8));
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200166 kfree(orig_node->bat_iv.bcast_own_sum);
167 orig_node->bat_iv.bcast_own_sum = data_ptr;
168
169 ret = 0;
170
171unlock:
172 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
173
174 return ret;
175}
176
177/**
178 * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
179 * exclude the removed interface
180 * @orig_node: the orig_node that has to be changed
181 * @max_if_num: the current amount of interfaces
182 * @del_if_num: the index of the interface being removed
183 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200184 * Return: 0 on success, a negative error code otherwise.
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200185 */
186static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
187 int max_if_num, int del_if_num)
188{
Sven Eckelmann13bbdd32015-11-29 01:48:57 +0100189 int ret = -ENOMEM;
190 size_t chunk_size, if_offset;
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200191 void *data_ptr = NULL;
192
193 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
194
195 /* last interface was removed */
196 if (max_if_num == 0)
197 goto free_bcast_own;
198
199 chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
Antonio Quartulli0185dda2014-05-24 06:43:47 +0200200 data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200201 if (!data_ptr)
202 goto unlock;
203
204 /* copy first part */
205 memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
206
207 /* copy second part */
Sven Eckelmann13bbdd32015-11-29 01:48:57 +0100208 if_offset = (del_if_num + 1) * chunk_size;
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200209 memcpy((char *)data_ptr + del_if_num * chunk_size,
Sven Eckelmann13bbdd32015-11-29 01:48:57 +0100210 (uint8_t *)orig_node->bat_iv.bcast_own + if_offset,
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200211 (max_if_num - del_if_num) * chunk_size);
212
213free_bcast_own:
214 kfree(orig_node->bat_iv.bcast_own);
215 orig_node->bat_iv.bcast_own = data_ptr;
216
217 if (max_if_num == 0)
218 goto free_own_sum;
219
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200220 data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200221 if (!data_ptr) {
222 kfree(orig_node->bat_iv.bcast_own);
223 goto unlock;
224 }
225
226 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200227 del_if_num * sizeof(u8));
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200228
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200229 if_offset = (del_if_num + 1) * sizeof(u8);
230 memcpy((char *)data_ptr + del_if_num * sizeof(u8),
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200231 orig_node->bat_iv.bcast_own_sum + if_offset,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200232 (max_if_num - del_if_num) * sizeof(u8));
Antonio Quartullid0015fd2013-09-03 11:10:23 +0200233
234free_own_sum:
235 kfree(orig_node->bat_iv.bcast_own_sum);
236 orig_node->bat_iv.bcast_own_sum = data_ptr;
237
238 ret = 0;
239unlock:
240 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
241
242 return ret;
243}
244
245/**
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200246 * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
247 * @bat_priv: the bat priv with all the soft interface information
248 * @addr: mac address of the originator
249 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200250 * Return: the originator object corresponding to the passed mac address or NULL
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200251 * on failure.
252 * If the object does not exists it is created an initialised.
253 */
254static struct batadv_orig_node *
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200255batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr)
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200256{
257 struct batadv_orig_node *orig_node;
258 int size, hash_added;
259
260 orig_node = batadv_orig_hash_find(bat_priv, addr);
261 if (orig_node)
262 return orig_node;
263
264 orig_node = batadv_orig_node_new(bat_priv, addr);
265 if (!orig_node)
266 return NULL;
267
268 spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
269
270 size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
271 orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
272 if (!orig_node->bat_iv.bcast_own)
273 goto free_orig_node;
274
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200275 size = bat_priv->num_ifaces * sizeof(u8);
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200276 orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
277 if (!orig_node->bat_iv.bcast_own_sum)
Antonio Quartullia5a5cb82014-02-15 02:17:20 +0100278 goto free_orig_node;
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200279
280 hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
281 batadv_choose_orig, orig_node,
282 &orig_node->hash_entry);
283 if (hash_added != 0)
Antonio Quartullia5a5cb82014-02-15 02:17:20 +0100284 goto free_orig_node;
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200285
286 return orig_node;
287
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200288free_orig_node:
Simon Wunderlichb2262df2014-02-08 16:45:06 +0100289 /* free twice, as batadv_orig_node_new sets refcount to 2 */
Sven Eckelmann5d967312016-01-17 11:01:09 +0100290 batadv_orig_node_put(orig_node);
291 batadv_orig_node_put(orig_node);
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200292
293 return NULL;
294}
295
Sven Eckelmann56303d32012-06-05 22:31:31 +0200296static struct batadv_neigh_node *
297batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200298 const u8 *neigh_addr,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200299 struct batadv_orig_node *orig_node,
Antonio Quartulli863dd7a2013-03-25 13:49:46 +0100300 struct batadv_orig_node *orig_neigh)
Marek Lindner7ae8b282012-03-01 15:35:21 +0800301{
Marek Lindner741aa062015-07-26 04:57:43 +0800302 struct batadv_neigh_node *neigh_node;
Marek Lindner7ae8b282012-03-01 15:35:21 +0800303
Marek Lindner3f32f8a2015-07-26 04:59:15 +0800304 neigh_node = batadv_neigh_node_new(orig_node, hard_iface, neigh_addr);
Marek Lindner7ae8b282012-03-01 15:35:21 +0800305 if (!neigh_node)
306 goto out;
307
Simon Wunderlich89652332013-11-13 19:14:46 +0100308 neigh_node->orig_node = orig_neigh;
Marek Lindner7ae8b282012-03-01 15:35:21 +0800309
Marek Lindner7ae8b282012-03-01 15:35:21 +0800310out:
311 return neigh_node;
312}
313
Sven Eckelmann56303d32012-06-05 22:31:31 +0200314static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
Marek Lindnerd0b9fd82011-07-30 12:33:33 +0200315{
Sven Eckelmann96412692012-06-05 22:31:30 +0200316 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindner14511512012-08-02 17:20:26 +0200317 unsigned char *ogm_buff;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200318 u32 random_seqno;
Marek Lindnerd7d32ec2012-02-07 17:20:46 +0800319
320 /* randomize initial seqno to avoid collision */
321 get_random_bytes(&random_seqno, sizeof(random_seqno));
Marek Lindner14511512012-08-02 17:20:26 +0200322 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
Marek Lindnerd0b9fd82011-07-30 12:33:33 +0200323
Marek Lindner14511512012-08-02 17:20:26 +0200324 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
325 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
326 if (!ogm_buff)
Markus Pargmann42d9f2c2014-12-26 12:41:26 +0100327 return -ENOMEM;
Marek Lindner77af7572012-02-07 17:20:48 +0800328
Marek Lindner14511512012-08-02 17:20:26 +0200329 hard_iface->bat_iv.ogm_buff = ogm_buff;
330
331 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100332 batadv_ogm_packet->packet_type = BATADV_IV_OGM;
333 batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
334 batadv_ogm_packet->ttl = 2;
Sven Eckelmann96412692012-06-05 22:31:30 +0200335 batadv_ogm_packet->flags = BATADV_NO_FLAGS;
Marek Lindner414254e2013-04-23 21:39:58 +0800336 batadv_ogm_packet->reserved = 0;
Sven Eckelmann96412692012-06-05 22:31:30 +0200337 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
Marek Lindner77af7572012-02-07 17:20:48 +0800338
Markus Pargmann42d9f2c2014-12-26 12:41:26 +0100339 return 0;
Marek Lindnerd0b9fd82011-07-30 12:33:33 +0200340}
341
Sven Eckelmann56303d32012-06-05 22:31:31 +0200342static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
Marek Lindner00a50072012-02-07 17:20:47 +0800343{
Marek Lindner14511512012-08-02 17:20:26 +0200344 kfree(hard_iface->bat_iv.ogm_buff);
345 hard_iface->bat_iv.ogm_buff = NULL;
Marek Lindner00a50072012-02-07 17:20:47 +0800346}
347
Sven Eckelmann56303d32012-06-05 22:31:31 +0200348static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
Marek Lindnerd0b9fd82011-07-30 12:33:33 +0200349{
Sven Eckelmann96412692012-06-05 22:31:30 +0200350 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindner14511512012-08-02 17:20:26 +0200351 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
Marek Lindnerd0b9fd82011-07-30 12:33:33 +0200352
Marek Lindner14511512012-08-02 17:20:26 +0200353 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100354 ether_addr_copy(batadv_ogm_packet->orig,
355 hard_iface->net_dev->dev_addr);
356 ether_addr_copy(batadv_ogm_packet->prev_sender,
357 hard_iface->net_dev->dev_addr);
Marek Lindnerd0b9fd82011-07-30 12:33:33 +0200358}
359
Sven Eckelmann56303d32012-06-05 22:31:31 +0200360static void
361batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
Marek Lindnerc3229392012-03-11 06:17:50 +0800362{
Sven Eckelmann96412692012-06-05 22:31:30 +0200363 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindner14511512012-08-02 17:20:26 +0200364 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
Marek Lindnerc3229392012-03-11 06:17:50 +0800365
Marek Lindner14511512012-08-02 17:20:26 +0200366 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100367 batadv_ogm_packet->ttl = BATADV_TTL;
Marek Lindnerc3229392012-03-11 06:17:50 +0800368}
369
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200370/* when do we schedule our own ogm to be sent */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200371static unsigned long
Sven Eckelmann56303d32012-06-05 22:31:31 +0200372batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200373{
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200374 unsigned int msecs;
375
376 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
Akinobu Mitae76e4322012-12-24 11:14:07 +0900377 msecs += prandom_u32() % (2 * BATADV_JITTER);
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200378
379 return jiffies + msecs_to_jiffies(msecs);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200380}
381
382/* when do we schedule a ogm packet to be sent */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200383static unsigned long batadv_iv_ogm_fwd_send_time(void)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200384{
Akinobu Mitae76e4322012-12-24 11:14:07 +0900385 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200386}
387
388/* apply hop penalty for a normal link */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200389static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200390{
391 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200392 int new_tq;
393
394 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
395 new_tq /= BATADV_TQ_MAX_VALUE;
396
397 return new_tq;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200398}
399
Simon Wunderlich600184b2015-11-23 19:57:21 +0100400/**
401 * batadv_iv_ogm_aggr_packet - checks if there is another OGM attached
402 * @buff_pos: current position in the skb
403 * @packet_len: total length of the skb
404 * @tvlv_len: tvlv length of the previously considered OGM
405 *
406 * Return: true if there is enough space for another OGM, false otherwise.
407 */
Markus Pargmann9fd9b192014-12-26 12:41:27 +0100408static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
409 __be16 tvlv_len)
Marek Lindnerfc957272011-07-30 12:04:12 +0200410{
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200411 int next_buff_pos = 0;
412
Sven Eckelmann7e071c72012-06-03 22:19:13 +0200413 next_buff_pos += buff_pos + BATADV_OGM_HLEN;
Marek Lindneref261572013-04-23 21:39:57 +0800414 next_buff_pos += ntohs(tvlv_len);
Marek Lindnerfc957272011-07-30 12:04:12 +0200415
416 return (next_buff_pos <= packet_len) &&
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200417 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
Marek Lindnerfc957272011-07-30 12:04:12 +0200418}
419
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200420/* send a batman ogm to a given interface */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200421static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
422 struct batadv_hard_iface *hard_iface)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200423{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200424 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
Markus Pargmannde12bae2014-12-26 12:41:28 +0100425 const char *fwd_str;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200426 u8 packet_num;
427 s16 buff_pos;
Sven Eckelmann96412692012-06-05 22:31:30 +0200428 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200429 struct sk_buff *skb;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200430 u8 *packet_pos;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200431
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200432 if (hard_iface->if_status != BATADV_IF_ACTIVE)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200433 return;
434
435 packet_num = 0;
436 buff_pos = 0;
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200437 packet_pos = forw_packet->skb->data;
438 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200439
440 /* adjust all flags and log packets */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200441 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
Marek Lindneref261572013-04-23 21:39:57 +0800442 batadv_ogm_packet->tvlv_len)) {
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200443 /* we might have aggregated direct link packets with an
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200444 * ordinary base packet
445 */
Sven Eckelmann8de47de2012-07-08 16:32:09 +0200446 if (forw_packet->direct_link_flags & BIT(packet_num) &&
447 forw_packet->if_incoming == hard_iface)
Sven Eckelmann96412692012-06-05 22:31:30 +0200448 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200449 else
Sven Eckelmann96412692012-06-05 22:31:30 +0200450 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200451
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200452 if (packet_num > 0 || !forw_packet->own)
453 fwd_str = "Forwarding";
454 else
455 fwd_str = "Sending own";
456
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200457 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Marek Lindnere1bf0c12013-04-23 21:40:01 +0800458 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200459 fwd_str, (packet_num > 0 ? "aggregated " : ""),
Sven Eckelmann96412692012-06-05 22:31:30 +0200460 batadv_ogm_packet->orig,
461 ntohl(batadv_ogm_packet->seqno),
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100462 batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
Sven Eckelmanna2f2b6c2015-04-23 18:22:24 +0200463 ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ?
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200464 "on" : "off"),
Marek Lindnere1bf0c12013-04-23 21:40:01 +0800465 hard_iface->net_dev->name,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200466 hard_iface->net_dev->dev_addr);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200467
Sven Eckelmann7e071c72012-06-03 22:19:13 +0200468 buff_pos += BATADV_OGM_HLEN;
Marek Lindneref261572013-04-23 21:39:57 +0800469 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200470 packet_num++;
Sven Eckelmannc67893d2012-07-08 18:33:51 +0200471 packet_pos = forw_packet->skb->data + buff_pos;
472 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200473 }
474
475 /* create clone because function is called more than once */
476 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
Martin Hundebøllf8214862012-04-20 17:02:45 +0200477 if (skb) {
Sven Eckelmannd69909d2012-06-03 22:19:20 +0200478 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
479 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
Martin Hundebøllf8214862012-04-20 17:02:45 +0200480 skb->len + ETH_HLEN);
Antonio Quartulli95d39272016-01-16 16:40:15 +0800481 batadv_send_broadcast_skb(skb, hard_iface);
Martin Hundebøllf8214862012-04-20 17:02:45 +0200482 }
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200483}
484
485/* send a batman ogm packet */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200486static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200487{
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200488 struct net_device *soft_iface;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200489 struct batadv_priv *bat_priv;
490 struct batadv_hard_iface *primary_if = NULL;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200491
492 if (!forw_packet->if_incoming) {
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100493 pr_err("Error - can't forward packet: incoming iface not specified\n");
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200494 goto out;
495 }
496
497 soft_iface = forw_packet->if_incoming->soft_iface;
498 bat_priv = netdev_priv(soft_iface);
499
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100500 if (WARN_ON(!forw_packet->if_outgoing))
501 goto out;
502
503 if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
504 goto out;
505
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200506 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200507 goto out;
508
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200509 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200510 if (!primary_if)
511 goto out;
512
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100513 /* only for one specific outgoing interface */
514 batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200515
516out:
517 if (primary_if)
Sven Eckelmann82047ad2016-01-17 11:01:10 +0100518 batadv_hardif_put(primary_if);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200519}
520
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100521/**
522 * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
523 * existing forward packet
524 * @new_bat_ogm_packet: OGM packet to be aggregated
525 * @bat_priv: the bat priv with all the soft interface information
526 * @packet_len: (total) length of the OGM
527 * @send_time: timestamp (jiffies) when the packet is to be sent
Martin Hundebøll95298a92014-07-15 09:41:05 +0200528 * @directlink: true if this is a direct link packet
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100529 * @if_incoming: interface where the packet was received
530 * @if_outgoing: interface for which the retransmission should be considered
531 * @forw_packet: the forwarded packet which should be checked
532 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200533 * Return: true if new_packet can be aggregated with forw_packet
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100534 */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200535static bool
Sven Eckelmann96412692012-06-05 22:31:30 +0200536batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200537 struct batadv_priv *bat_priv,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200538 int packet_len, unsigned long send_time,
539 bool directlink,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200540 const struct batadv_hard_iface *if_incoming,
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100541 const struct batadv_hard_iface *if_outgoing,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200542 const struct batadv_forw_packet *forw_packet)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200543{
Sven Eckelmann96412692012-06-05 22:31:30 +0200544 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200545 int aggregated_bytes = forw_packet->packet_len + packet_len;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200546 struct batadv_hard_iface *primary_if = NULL;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200547 bool res = false;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200548 unsigned long aggregation_end_time;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200549
Sven Eckelmann96412692012-06-05 22:31:30 +0200550 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200551 aggregation_end_time = send_time;
552 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200553
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200554 /* we can aggregate the current packet to this aggregated packet
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200555 * if:
556 *
557 * - the send time is within our MAX_AGGREGATION_MS time
558 * - the resulting packet wont be bigger than
559 * MAX_AGGREGATION_BYTES
Markus Pargmann8f34b382014-12-26 12:41:29 +0100560 * otherwise aggregation is not possible
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200561 */
Markus Pargmann8f34b382014-12-26 12:41:29 +0100562 if (!time_before(send_time, forw_packet->send_time) ||
563 !time_after_eq(aggregation_end_time, forw_packet->send_time))
564 return false;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200565
Markus Pargmann8f34b382014-12-26 12:41:29 +0100566 if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
567 return false;
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100568
Markus Pargmann8f34b382014-12-26 12:41:29 +0100569 /* packet is not leaving on the same interface. */
570 if (forw_packet->if_outgoing != if_outgoing)
571 return false;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200572
Markus Pargmann8f34b382014-12-26 12:41:29 +0100573 /* check aggregation compatibility
574 * -> direct link packets are broadcasted on
575 * their interface only
576 * -> aggregate packet if the current packet is
577 * a "global" packet as well as the base
578 * packet
579 */
580 primary_if = batadv_primary_if_get_selected(bat_priv);
581 if (!primary_if)
582 return false;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200583
Markus Pargmann8f34b382014-12-26 12:41:29 +0100584 /* packets without direct link flag and high TTL
585 * are flooded through the net
586 */
587 if (!directlink &&
588 !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
589 batadv_ogm_packet->ttl != 1 &&
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200590
Markus Pargmann8f34b382014-12-26 12:41:29 +0100591 /* own packets originating non-primary
592 * interfaces leave only that interface
593 */
594 (!forw_packet->own ||
595 forw_packet->if_incoming == primary_if)) {
596 res = true;
597 goto out;
598 }
599
600 /* if the incoming packet is sent via this one
601 * interface only - we still can aggregate
602 */
603 if (directlink &&
604 new_bat_ogm_packet->ttl == 1 &&
605 forw_packet->if_incoming == if_incoming &&
606
607 /* packets from direct neighbors or
608 * own secondary interface packets
609 * (= secondary interface packets in general)
610 */
611 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
612 (forw_packet->own &&
613 forw_packet->if_incoming != primary_if))) {
614 res = true;
615 goto out;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200616 }
617
618out:
619 if (primary_if)
Sven Eckelmann82047ad2016-01-17 11:01:10 +0100620 batadv_hardif_put(primary_if);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200621 return res;
622}
623
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100624/**
625 * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100626 * packet to it.
627 * @packet_buff: pointer to the OGM
628 * @packet_len: (total) length of the OGM
629 * @send_time: timestamp (jiffies) when the packet is to be sent
630 * @direct_link: whether this OGM has direct link status
631 * @if_incoming: interface where the packet was received
632 * @if_outgoing: interface for which the retransmission should be considered
633 * @own_packet: true if it is a self-generated ogm
634 */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200635static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
636 int packet_len, unsigned long send_time,
637 bool direct_link,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200638 struct batadv_hard_iface *if_incoming,
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100639 struct batadv_hard_iface *if_outgoing,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200640 int own_packet)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200641{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200642 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
643 struct batadv_forw_packet *forw_packet_aggr;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200644 unsigned char *skb_buff;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200645 unsigned int skb_size;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200646
Sven Eckelmann7a659d52016-01-16 10:29:54 +0100647 if (!kref_get_unless_zero(&if_incoming->refcount))
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200648 return;
649
Sven Eckelmann7a659d52016-01-16 10:29:54 +0100650 if (!kref_get_unless_zero(&if_outgoing->refcount))
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100651 goto out_free_incoming;
652
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200653 /* own packet should always be scheduled */
654 if (!own_packet) {
Sven Eckelmann3e348192012-05-16 20:23:22 +0200655 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200656 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200657 "batman packet queue full\n");
Markus Pargmann940d1562014-12-26 12:41:31 +0100658 goto out_free_outgoing;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200659 }
660 }
661
662 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
Markus Pargmann940d1562014-12-26 12:41:31 +0100663 if (!forw_packet_aggr)
664 goto out_nomem;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200665
Markus Pargmann940d1562014-12-26 12:41:31 +0100666 if (atomic_read(&bat_priv->aggregated_ogms) &&
667 packet_len < BATADV_MAX_AGGREGATION_BYTES)
Sven Eckelmann5b246572012-11-04 17:11:45 +0100668 skb_size = BATADV_MAX_AGGREGATION_BYTES;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200669 else
Sven Eckelmann5b246572012-11-04 17:11:45 +0100670 skb_size = packet_len;
671
Antonio Quartulli41ab6c42013-04-02 22:28:44 +0200672 skb_size += ETH_HLEN;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200673
Antonio Quartulli41ab6c42013-04-02 22:28:44 +0200674 forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
Markus Pargmann940d1562014-12-26 12:41:31 +0100675 if (!forw_packet_aggr->skb)
676 goto out_free_forw_packet;
Simon Wunderlichc54f38c2013-07-29 17:56:44 +0200677 forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
Antonio Quartulli41ab6c42013-04-02 22:28:44 +0200678 skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200679
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200680 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
681 forw_packet_aggr->packet_len = packet_len;
682 memcpy(skb_buff, packet_buff, packet_len);
683
684 forw_packet_aggr->own = own_packet;
685 forw_packet_aggr->if_incoming = if_incoming;
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100686 forw_packet_aggr->if_outgoing = if_outgoing;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200687 forw_packet_aggr->num_packets = 0;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200688 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200689 forw_packet_aggr->send_time = send_time;
690
691 /* save packet direct link flag status */
692 if (direct_link)
693 forw_packet_aggr->direct_link_flags |= 1;
694
695 /* add new packet to packet list */
696 spin_lock_bh(&bat_priv->forw_bat_list_lock);
697 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
698 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
699
700 /* start timer for this packet */
701 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
Sven Eckelmann9455e342012-05-12 02:09:37 +0200702 batadv_send_outstanding_bat_ogm_packet);
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200703 queue_delayed_work(batadv_event_workqueue,
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200704 &forw_packet_aggr->delayed_work,
705 send_time - jiffies);
706
707 return;
Markus Pargmann940d1562014-12-26 12:41:31 +0100708out_free_forw_packet:
709 kfree(forw_packet_aggr);
710out_nomem:
711 if (!own_packet)
712 atomic_inc(&bat_priv->batman_queue_left);
713out_free_outgoing:
Sven Eckelmann82047ad2016-01-17 11:01:10 +0100714 batadv_hardif_put(if_outgoing);
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100715out_free_incoming:
Sven Eckelmann82047ad2016-01-17 11:01:10 +0100716 batadv_hardif_put(if_incoming);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200717}
718
719/* aggregate a new packet into the existing ogm packet */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200720static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200721 const unsigned char *packet_buff,
722 int packet_len, bool direct_link)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200723{
724 unsigned char *skb_buff;
Sven Eckelmann8de47de2012-07-08 16:32:09 +0200725 unsigned long new_direct_link_flag;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200726
727 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
728 memcpy(skb_buff, packet_buff, packet_len);
729 forw_packet_aggr->packet_len += packet_len;
730 forw_packet_aggr->num_packets++;
731
732 /* save packet direct link flag status */
Sven Eckelmann8de47de2012-07-08 16:32:09 +0200733 if (direct_link) {
734 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
735 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
736 }
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200737}
738
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100739/**
740 * batadv_iv_ogm_queue_add - queue up an OGM for transmission
741 * @bat_priv: the bat priv with all the soft interface information
742 * @packet_buff: pointer to the OGM
743 * @packet_len: (total) length of the OGM
744 * @if_incoming: interface where the packet was received
745 * @if_outgoing: interface for which the retransmission should be considered
746 * @own_packet: true if it is a self-generated ogm
747 * @send_time: timestamp (jiffies) when the packet is to be sent
748 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200749static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200750 unsigned char *packet_buff,
751 int packet_len,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200752 struct batadv_hard_iface *if_incoming,
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100753 struct batadv_hard_iface *if_outgoing,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200754 int own_packet, unsigned long send_time)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200755{
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200756 /* _aggr -> pointer to the packet we want to aggregate with
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200757 * _pos -> pointer to the position in the queue
758 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200759 struct batadv_forw_packet *forw_packet_aggr = NULL;
760 struct batadv_forw_packet *forw_packet_pos = NULL;
Sven Eckelmann96412692012-06-05 22:31:30 +0200761 struct batadv_ogm_packet *batadv_ogm_packet;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200762 bool direct_link;
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200763 unsigned long max_aggregation_jiffies;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200764
Sven Eckelmann96412692012-06-05 22:31:30 +0200765 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
Markus Pargmann56489152014-12-26 12:41:32 +0100766 direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200767 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200768
769 /* find position for the packet in the forward queue */
770 spin_lock_bh(&bat_priv->forw_bat_list_lock);
771 /* own packets are not to be aggregated */
Markus Pargmann56489152014-12-26 12:41:32 +0100772 if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
Sasha Levinb67bfe02013-02-27 17:06:00 -0800773 hlist_for_each_entry(forw_packet_pos,
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200774 &bat_priv->forw_bat_list, list) {
Sven Eckelmann96412692012-06-05 22:31:30 +0200775 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200776 bat_priv, packet_len,
777 send_time, direct_link,
778 if_incoming,
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100779 if_outgoing,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200780 forw_packet_pos)) {
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200781 forw_packet_aggr = forw_packet_pos;
782 break;
783 }
784 }
785 }
786
787 /* nothing to aggregate with - either aggregation disabled or no
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200788 * suitable aggregation packet found
789 */
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200790 if (!forw_packet_aggr) {
791 /* the following section can run without the lock */
792 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
793
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200794 /* if we could not aggregate this packet with one of the others
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200795 * we hold it back for a while, so that it might be aggregated
796 * later on
797 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200798 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
799 send_time += max_aggregation_jiffies;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200800
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200801 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
802 send_time, direct_link,
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100803 if_incoming, if_outgoing,
804 own_packet);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200805 } else {
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200806 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
807 packet_len, direct_link);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200808 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
809 }
810}
811
Sven Eckelmann56303d32012-06-05 22:31:31 +0200812static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200813 const struct ethhdr *ethhdr,
Sven Eckelmann96412692012-06-05 22:31:30 +0200814 struct batadv_ogm_packet *batadv_ogm_packet,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200815 bool is_single_hop_neigh,
816 bool is_from_best_next_hop,
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100817 struct batadv_hard_iface *if_incoming,
818 struct batadv_hard_iface *if_outgoing)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200819{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200820 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200821 u16 tvlv_len;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200822
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100823 if (batadv_ogm_packet->ttl <= 1) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200824 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200825 return;
826 }
827
Marek Lindner13b25412012-03-11 06:17:53 +0800828 if (!is_from_best_next_hop) {
829 /* Mark the forwarded packet when it is not coming from our
830 * best next hop. We still need to forward the packet for our
831 * neighbor link quality detection to work in case the packet
832 * originated from a single hop neighbor. Otherwise we can
833 * simply drop the ogm.
834 */
835 if (is_single_hop_neigh)
Sven Eckelmann96412692012-06-05 22:31:30 +0200836 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
Marek Lindner13b25412012-03-11 06:17:53 +0800837 else
838 return;
839 }
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200840
Marek Lindneref261572013-04-23 21:39:57 +0800841 tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200842
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100843 batadv_ogm_packet->ttl--;
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100844 ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200845
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200846 /* apply hop penalty */
Sven Eckelmann96412692012-06-05 22:31:30 +0200847 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200848 bat_priv);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200849
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200850 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200851 "Forwarding packet: tq: %i, ttl: %i\n",
Simon Wunderlicha40d9b02013-12-02 20:38:31 +0100852 batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200853
Marek Lindner75cd33f2012-03-01 15:35:16 +0800854 if (is_single_hop_neigh)
Sven Eckelmann96412692012-06-05 22:31:30 +0200855 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200856 else
Sven Eckelmann96412692012-06-05 22:31:30 +0200857 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200858
Sven Eckelmann96412692012-06-05 22:31:30 +0200859 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
Marek Lindneref261572013-04-23 21:39:57 +0800860 BATADV_OGM_HLEN + tvlv_len,
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100861 if_incoming, if_outgoing, 0,
862 batadv_iv_ogm_fwd_send_time());
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200863}
864
Antonio Quartullid9896612013-04-17 17:44:43 +0200865/**
866 * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
867 * the given interface
868 * @hard_iface: the interface for which the windows have to be shifted
869 */
870static void
871batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
872{
873 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
874 struct batadv_hashtable *hash = bat_priv->orig_hash;
875 struct hlist_head *head;
876 struct batadv_orig_node *orig_node;
877 unsigned long *word;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200878 u32 i;
Antonio Quartullid9896612013-04-17 17:44:43 +0200879 size_t word_index;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200880 u8 *w;
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200881 int if_num;
Antonio Quartullid9896612013-04-17 17:44:43 +0200882
883 for (i = 0; i < hash->size; i++) {
884 head = &hash->table[i];
885
886 rcu_read_lock();
887 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200888 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
Antonio Quartullid9896612013-04-17 17:44:43 +0200889 word_index = hard_iface->if_num * BATADV_NUM_WORDS;
Antonio Quartulli32db6aa2014-09-01 14:37:29 +0200890 word = &orig_node->bat_iv.bcast_own[word_index];
Antonio Quartullid9896612013-04-17 17:44:43 +0200891
892 batadv_bit_get_packet(bat_priv, word, 1, 0);
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200893 if_num = hard_iface->if_num;
894 w = &orig_node->bat_iv.bcast_own_sum[if_num];
Antonio Quartullid9896612013-04-17 17:44:43 +0200895 *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
Antonio Quartullibbad0a52013-09-02 12:15:02 +0200896 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
Antonio Quartullid9896612013-04-17 17:44:43 +0200897 }
898 rcu_read_unlock();
899 }
900}
901
Sven Eckelmann56303d32012-06-05 22:31:31 +0200902static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200903{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200904 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
Marek Lindner14511512012-08-02 17:20:26 +0200905 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
Sven Eckelmann96412692012-06-05 22:31:30 +0200906 struct batadv_ogm_packet *batadv_ogm_packet;
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100907 struct batadv_hard_iface *primary_if, *tmp_hard_iface;
Marek Lindner14511512012-08-02 17:20:26 +0200908 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200909 u32 seqno;
910 u16 tvlv_len = 0;
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100911 unsigned long send_time;
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200912
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200913 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200914
Marek Lindnere1bf0c12013-04-23 21:40:01 +0800915 if (hard_iface == primary_if) {
916 /* tt changes have to be committed before the tvlv data is
917 * appended as it may alter the tt tvlv container
918 */
919 batadv_tt_local_commit_changes(bat_priv);
Marek Lindneref261572013-04-23 21:39:57 +0800920 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
921 ogm_buff_len,
922 BATADV_OGM_HLEN);
Marek Lindnere1bf0c12013-04-23 21:40:01 +0800923 }
Marek Lindnerbe9aa4c2012-05-07 04:22:05 +0800924
Marek Lindner14511512012-08-02 17:20:26 +0200925 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
Marek Lindneref261572013-04-23 21:39:57 +0800926 batadv_ogm_packet->tvlv_len = htons(tvlv_len);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200927
928 /* change sequence number to network order */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200929 seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200930 batadv_ogm_packet->seqno = htonl(seqno);
Marek Lindner14511512012-08-02 17:20:26 +0200931 atomic_inc(&hard_iface->bat_iv.ogm_seqno);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200932
Antonio Quartullid9896612013-04-17 17:44:43 +0200933 batadv_iv_ogm_slide_own_bcast_window(hard_iface);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200934
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100935 send_time = batadv_iv_ogm_emit_send_time(bat_priv);
936
937 if (hard_iface != primary_if) {
938 /* OGMs from secondary interfaces are only scheduled on their
939 * respective interfaces.
940 */
941 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
942 hard_iface, hard_iface, 1, send_time);
943 goto out;
944 }
945
946 /* OGMs from primary interfaces are scheduled on all
947 * interfaces.
948 */
949 rcu_read_lock();
950 list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
951 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
Sven Eckelmann87b40f52015-07-17 10:03:42 +0200952 continue;
Simon Wunderlichef0a9372013-11-13 19:14:49 +0100953 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
954 *ogm_buff_len, hard_iface,
955 tmp_hard_iface, 1, send_time);
956 }
957 rcu_read_unlock();
958
959out:
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200960 if (primary_if)
Sven Eckelmann82047ad2016-01-17 11:01:10 +0100961 batadv_hardif_put(primary_if);
Marek Lindnerb9dacc52011-08-03 09:09:30 +0200962}
963
Simon Wunderlich89652332013-11-13 19:14:46 +0100964/**
965 * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
966 * originator
967 * @bat_priv: the bat priv with all the soft interface information
968 * @orig_node: the orig node who originally emitted the ogm packet
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100969 * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
Simon Wunderlich89652332013-11-13 19:14:46 +0100970 * @ethhdr: Ethernet header of the OGM
971 * @batadv_ogm_packet: the ogm packet
972 * @if_incoming: interface where the packet was received
973 * @if_outgoing: interface for which the retransmission should be considered
Simon Wunderlich89652332013-11-13 19:14:46 +0100974 * @dup_status: the duplicate status of this ogm packet.
975 */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200976static void
Sven Eckelmann56303d32012-06-05 22:31:31 +0200977batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
978 struct batadv_orig_node *orig_node,
Simon Wunderlich7351a4822013-11-13 19:14:47 +0100979 struct batadv_orig_ifinfo *orig_ifinfo,
Sven Eckelmannfe8bc392012-05-12 18:33:51 +0200980 const struct ethhdr *ethhdr,
Sven Eckelmann96412692012-06-05 22:31:30 +0200981 const struct batadv_ogm_packet *batadv_ogm_packet,
Sven Eckelmann56303d32012-06-05 22:31:31 +0200982 struct batadv_hard_iface *if_incoming,
Simon Wunderlich89652332013-11-13 19:14:46 +0100983 struct batadv_hard_iface *if_outgoing,
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +0200984 enum batadv_dup_status dup_status)
Marek Lindnerfc957272011-07-30 12:04:12 +0200985{
Simon Wunderlich89652332013-11-13 19:14:46 +0100986 struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
987 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
Sven Eckelmann4f248cf2015-06-09 20:50:49 +0200988 struct batadv_neigh_node *neigh_node = NULL;
989 struct batadv_neigh_node *tmp_neigh_node = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200990 struct batadv_neigh_node *router = NULL;
991 struct batadv_orig_node *orig_node_tmp;
Linus Lüssing7caf69f2012-09-18 03:01:08 +0200992 int if_num;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200993 u8 sum_orig, sum_neigh;
994 u8 *neigh_addr;
995 u8 tq_avg;
Marek Lindnerfc957272011-07-30 12:04:12 +0200996
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200997 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200998 "update_originator(): Searching and updating originator entry of received packet\n");
Marek Lindnerfc957272011-07-30 12:04:12 +0200999
1000 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001001 hlist_for_each_entry_rcu(tmp_neigh_node,
Marek Lindnerfc957272011-07-30 12:04:12 +02001002 &orig_node->neigh_list, list) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001003 neigh_addr = tmp_neigh_node->addr;
1004 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1005 tmp_neigh_node->if_incoming == if_incoming &&
Sven Eckelmann77ae32e2016-01-16 10:29:53 +01001006 kref_get_unless_zero(&tmp_neigh_node->refcount)) {
Antonio Quartulli38dc40e2013-03-30 17:22:00 +01001007 if (WARN(neigh_node, "too many matching neigh_nodes"))
Sven Eckelmann25bb2502016-01-17 11:01:11 +01001008 batadv_neigh_node_put(neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001009 neigh_node = tmp_neigh_node;
1010 continue;
1011 }
1012
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001013 if (dup_status != BATADV_NO_DUP)
Marek Lindnerfc957272011-07-30 12:04:12 +02001014 continue;
1015
Simon Wunderlich89652332013-11-13 19:14:46 +01001016 /* only update the entry for this outgoing interface */
1017 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1018 if_outgoing);
1019 if (!neigh_ifinfo)
1020 continue;
1021
1022 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1023 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1024 &neigh_ifinfo->bat_iv.tq_index, 0);
1025 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1026 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1027 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1028
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01001029 batadv_neigh_ifinfo_put(neigh_ifinfo);
Simon Wunderlich89652332013-11-13 19:14:46 +01001030 neigh_ifinfo = NULL;
Marek Lindnerfc957272011-07-30 12:04:12 +02001031 }
1032
1033 if (!neigh_node) {
Sven Eckelmann56303d32012-06-05 22:31:31 +02001034 struct batadv_orig_node *orig_tmp;
Marek Lindnerfc957272011-07-30 12:04:12 +02001035
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001036 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +02001037 if (!orig_tmp)
1038 goto unlock;
1039
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001040 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1041 ethhdr->h_source,
Antonio Quartulli863dd7a2013-03-25 13:49:46 +01001042 orig_node, orig_tmp);
Marek Lindnerfc957272011-07-30 12:04:12 +02001043
Sven Eckelmann5d967312016-01-17 11:01:09 +01001044 batadv_orig_node_put(orig_tmp);
Marek Lindnerfc957272011-07-30 12:04:12 +02001045 if (!neigh_node)
1046 goto unlock;
Markus Pargmann23badd62014-12-26 12:41:33 +01001047 } else {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001048 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001049 "Updating existing last-hop neighbor of originator\n");
Markus Pargmann23badd62014-12-26 12:41:33 +01001050 }
Marek Lindnerfc957272011-07-30 12:04:12 +02001051
1052 rcu_read_unlock();
Simon Wunderlich89652332013-11-13 19:14:46 +01001053 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1054 if (!neigh_ifinfo)
1055 goto out;
Marek Lindnerfc957272011-07-30 12:04:12 +02001056
Marek Lindnerd7b2a972012-03-01 15:35:19 +08001057 neigh_node->last_seen = jiffies;
Marek Lindnerfc957272011-07-30 12:04:12 +02001058
Simon Wunderlich89652332013-11-13 19:14:46 +01001059 spin_lock_bh(&neigh_node->ifinfo_lock);
1060 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1061 &neigh_ifinfo->bat_iv.tq_index,
Sven Eckelmann96412692012-06-05 22:31:30 +02001062 batadv_ogm_packet->tq);
Simon Wunderlich89652332013-11-13 19:14:46 +01001063 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1064 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1065 spin_unlock_bh(&neigh_node->ifinfo_lock);
Marek Lindnerfc957272011-07-30 12:04:12 +02001066
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001067 if (dup_status == BATADV_NO_DUP) {
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001068 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
Simon Wunderlich89652332013-11-13 19:14:46 +01001069 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
Marek Lindnerfc957272011-07-30 12:04:12 +02001070 }
1071
Marek Lindnerfc957272011-07-30 12:04:12 +02001072 /* if this neighbor already is our next hop there is nothing
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001073 * to change
1074 */
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001075 router = batadv_orig_router_get(orig_node, if_outgoing);
Marek Lindnerfc957272011-07-30 12:04:12 +02001076 if (router == neigh_node)
Marek Lindnere1bf0c12013-04-23 21:40:01 +08001077 goto out;
Marek Lindnerfc957272011-07-30 12:04:12 +02001078
Simon Wunderlich89652332013-11-13 19:14:46 +01001079 if (router) {
1080 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1081 if (!router_ifinfo)
1082 goto out;
1083
1084 /* if this neighbor does not offer a better TQ we won't
1085 * consider it
1086 */
1087 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1088 goto out;
1089 }
Marek Lindnerfc957272011-07-30 12:04:12 +02001090
1091 /* if the TQ is the same and the link not more symmetric we
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001092 * won't consider it either
1093 */
Simon Wunderlich89652332013-11-13 19:14:46 +01001094 if (router_ifinfo &&
Markus Pargmann01b97a32014-12-26 12:41:30 +01001095 neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
Marek Lindnerfc957272011-07-30 12:04:12 +02001096 orig_node_tmp = router->orig_node;
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001097 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
Linus Lüssing7caf69f2012-09-18 03:01:08 +02001098 if_num = router->if_incoming->if_num;
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001099 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1100 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
Marek Lindnerfc957272011-07-30 12:04:12 +02001101
1102 orig_node_tmp = neigh_node->orig_node;
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001103 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
Linus Lüssing7caf69f2012-09-18 03:01:08 +02001104 if_num = neigh_node->if_incoming->if_num;
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001105 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1106 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
Marek Lindnerfc957272011-07-30 12:04:12 +02001107
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001108 if (sum_orig >= sum_neigh)
Marek Lindnere1bf0c12013-04-23 21:40:01 +08001109 goto out;
Marek Lindnerfc957272011-07-30 12:04:12 +02001110 }
1111
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001112 batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001113 goto out;
1114
1115unlock:
1116 rcu_read_unlock();
1117out:
1118 if (neigh_node)
Sven Eckelmann25bb2502016-01-17 11:01:11 +01001119 batadv_neigh_node_put(neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001120 if (router)
Sven Eckelmann25bb2502016-01-17 11:01:11 +01001121 batadv_neigh_node_put(router);
Simon Wunderlich89652332013-11-13 19:14:46 +01001122 if (neigh_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01001123 batadv_neigh_ifinfo_put(neigh_ifinfo);
Simon Wunderlich89652332013-11-13 19:14:46 +01001124 if (router_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01001125 batadv_neigh_ifinfo_put(router_ifinfo);
Marek Lindnerfc957272011-07-30 12:04:12 +02001126}
1127
Simon Wunderlich89652332013-11-13 19:14:46 +01001128/**
1129 * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1130 * @orig_node: the orig node who originally emitted the ogm packet
1131 * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1132 * @batadv_ogm_packet: the ogm packet
1133 * @if_incoming: interface where the packet was received
1134 * @if_outgoing: interface for which the retransmission should be considered
1135 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +02001136 * Return: 1 if the link can be considered bidirectional, 0 otherwise
Simon Wunderlich89652332013-11-13 19:14:46 +01001137 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001138static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1139 struct batadv_orig_node *orig_neigh_node,
Sven Eckelmann96412692012-06-05 22:31:30 +02001140 struct batadv_ogm_packet *batadv_ogm_packet,
Simon Wunderlich89652332013-11-13 19:14:46 +01001141 struct batadv_hard_iface *if_incoming,
1142 struct batadv_hard_iface *if_outgoing)
Marek Lindnerfc957272011-07-30 12:04:12 +02001143{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001144 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1145 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
Simon Wunderlich89652332013-11-13 19:14:46 +01001146 struct batadv_neigh_ifinfo *neigh_ifinfo;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001147 u8 total_count;
1148 u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001149 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001150 int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001151 unsigned int combined_tq;
Simon Wunderlichc0398762013-11-13 19:14:48 +01001152 int tq_iface_penalty;
Marek Lindnerfc957272011-07-30 12:04:12 +02001153
1154 /* find corresponding one hop neighbor */
1155 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001156 hlist_for_each_entry_rcu(tmp_neigh_node,
Marek Lindnerfc957272011-07-30 12:04:12 +02001157 &orig_neigh_node->neigh_list, list) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001158 if (!batadv_compare_eth(tmp_neigh_node->addr,
1159 orig_neigh_node->orig))
Marek Lindnerfc957272011-07-30 12:04:12 +02001160 continue;
1161
1162 if (tmp_neigh_node->if_incoming != if_incoming)
1163 continue;
1164
Sven Eckelmann77ae32e2016-01-16 10:29:53 +01001165 if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
Marek Lindnerfc957272011-07-30 12:04:12 +02001166 continue;
1167
1168 neigh_node = tmp_neigh_node;
1169 break;
1170 }
1171 rcu_read_unlock();
1172
1173 if (!neigh_node)
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001174 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1175 orig_neigh_node->orig,
1176 orig_neigh_node,
Antonio Quartulli863dd7a2013-03-25 13:49:46 +01001177 orig_neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001178
1179 if (!neigh_node)
1180 goto out;
1181
Marek Lindnerd7b2a972012-03-01 15:35:19 +08001182 /* if orig_node is direct neighbor update neigh_node last_seen */
Marek Lindnerfc957272011-07-30 12:04:12 +02001183 if (orig_node == orig_neigh_node)
Marek Lindnerd7b2a972012-03-01 15:35:19 +08001184 neigh_node->last_seen = jiffies;
Marek Lindnerfc957272011-07-30 12:04:12 +02001185
Marek Lindnerd7b2a972012-03-01 15:35:19 +08001186 orig_node->last_seen = jiffies;
Marek Lindnerfc957272011-07-30 12:04:12 +02001187
1188 /* find packet count of corresponding one hop neighbor */
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001189 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1190 if_num = if_incoming->if_num;
1191 orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
Simon Wunderlich89652332013-11-13 19:14:46 +01001192 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1193 if (neigh_ifinfo) {
1194 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01001195 batadv_neigh_ifinfo_put(neigh_ifinfo);
Simon Wunderlich89652332013-11-13 19:14:46 +01001196 } else {
1197 neigh_rq_count = 0;
1198 }
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001199 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
Marek Lindnerfc957272011-07-30 12:04:12 +02001200
1201 /* pay attention to not get a value bigger than 100 % */
Sven Eckelmannc67893d2012-07-08 18:33:51 +02001202 if (orig_eq_count > neigh_rq_count)
1203 total_count = neigh_rq_count;
1204 else
1205 total_count = orig_eq_count;
Marek Lindnerfc957272011-07-30 12:04:12 +02001206
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001207 /* if we have too few packets (too less data) we set tq_own to zero
1208 * if we receive too few packets it is not considered bidirectional
1209 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001210 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1211 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
Marek Lindnerfc957272011-07-30 12:04:12 +02001212 tq_own = 0;
1213 else
1214 /* neigh_node->real_packet_count is never zero as we
1215 * only purge old information when getting new
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001216 * information
1217 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001218 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
Marek Lindnerfc957272011-07-30 12:04:12 +02001219
Sven Eckelmann21a12362012-03-07 09:07:46 +01001220 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
Marek Lindnerfc957272011-07-30 12:04:12 +02001221 * affect the nearly-symmetric links only a little, but
1222 * punishes asymmetric links more. This will give a value
1223 * between 0 and TQ_MAX_VALUE
1224 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001225 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1226 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1227 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1228 BATADV_TQ_LOCAL_WINDOW_SIZE *
1229 BATADV_TQ_LOCAL_WINDOW_SIZE;
1230 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1231 inv_asym_penalty /= neigh_rq_max_cube;
1232 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
Marek Lindnerfc957272011-07-30 12:04:12 +02001233
Simon Wunderlichc0398762013-11-13 19:14:48 +01001234 /* penalize if the OGM is forwarded on the same interface. WiFi
1235 * interfaces and other half duplex devices suffer from throughput
1236 * drops as they can't send and receive at the same time.
1237 */
1238 tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1239 if (if_outgoing && (if_incoming == if_outgoing) &&
1240 batadv_is_wifi_netdev(if_outgoing->net_dev))
1241 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1242 bat_priv);
1243
1244 combined_tq = batadv_ogm_packet->tq *
1245 tq_own *
1246 tq_asym_penalty *
1247 tq_iface_penalty;
1248 combined_tq /= BATADV_TQ_MAX_VALUE *
1249 BATADV_TQ_MAX_VALUE *
1250 BATADV_TQ_MAX_VALUE;
Sven Eckelmann96412692012-06-05 22:31:30 +02001251 batadv_ogm_packet->tq = combined_tq;
Marek Lindnerfc957272011-07-30 12:04:12 +02001252
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001253 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Simon Wunderlichc0398762013-11-13 19:14:48 +01001254 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001255 orig_node->orig, orig_neigh_node->orig, total_count,
Simon Wunderlichc0398762013-11-13 19:14:48 +01001256 neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1257 batadv_ogm_packet->tq, if_incoming->net_dev->name,
1258 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
Marek Lindnerfc957272011-07-30 12:04:12 +02001259
1260 /* if link has the minimum required transmission quality
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001261 * consider it bidirectional
1262 */
Sven Eckelmann96412692012-06-05 22:31:30 +02001263 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
Marek Lindnerfc957272011-07-30 12:04:12 +02001264 ret = 1;
1265
1266out:
1267 if (neigh_node)
Sven Eckelmann25bb2502016-01-17 11:01:11 +01001268 batadv_neigh_node_put(neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001269 return ret;
1270}
1271
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001272/**
1273 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces,
1274 * adjust the sequence number and find out whether it is a duplicate
1275 * @ethhdr: ethernet header of the packet
1276 * @batadv_ogm_packet: OGM packet to be considered
1277 * @if_incoming: interface on which the OGM packet was received
Simon Wunderlich89652332013-11-13 19:14:46 +01001278 * @if_outgoing: interface for which the retransmission should be considered
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001279 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +02001280 * Return: duplicate status as enum batadv_dup_status
Marek Lindnerfc957272011-07-30 12:04:12 +02001281 */
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001282static enum batadv_dup_status
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001283batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
Sven Eckelmann96412692012-06-05 22:31:30 +02001284 const struct batadv_ogm_packet *batadv_ogm_packet,
Simon Wunderlich89652332013-11-13 19:14:46 +01001285 const struct batadv_hard_iface *if_incoming,
1286 struct batadv_hard_iface *if_outgoing)
Marek Lindnerfc957272011-07-30 12:04:12 +02001287{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001288 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1289 struct batadv_orig_node *orig_node;
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001290 struct batadv_orig_ifinfo *orig_ifinfo = NULL;
Simon Wunderlich89652332013-11-13 19:14:46 +01001291 struct batadv_neigh_node *neigh_node;
1292 struct batadv_neigh_ifinfo *neigh_ifinfo;
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001293 int is_dup;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001294 s32 seq_diff;
Marek Lindnerfc957272011-07-30 12:04:12 +02001295 int need_update = 0;
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001296 int set_mark;
1297 enum batadv_dup_status ret = BATADV_NO_DUP;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001298 u32 seqno = ntohl(batadv_ogm_packet->seqno);
1299 u8 *neigh_addr;
1300 u8 packet_count;
Antonio Quartulli0538f752013-09-02 12:15:01 +02001301 unsigned long *bitmap;
Marek Lindnerfc957272011-07-30 12:04:12 +02001302
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001303 orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
Marek Lindnerfc957272011-07-30 12:04:12 +02001304 if (!orig_node)
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001305 return BATADV_NO_DUP;
Marek Lindnerfc957272011-07-30 12:04:12 +02001306
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001307 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1308 if (WARN_ON(!orig_ifinfo)) {
Sven Eckelmann5d967312016-01-17 11:01:09 +01001309 batadv_orig_node_put(orig_node);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001310 return 0;
1311 }
1312
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001313 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001314 seq_diff = seqno - orig_ifinfo->last_real_seqno;
Marek Lindnerfc957272011-07-30 12:04:12 +02001315
1316 /* signalize caller that the packet is to be dropped. */
Antonio Quartulli1e5cc262012-02-26 15:39:42 +01001317 if (!hlist_empty(&orig_node->neigh_list) &&
Sven Eckelmann30d3c512012-05-12 02:09:36 +02001318 batadv_window_protected(bat_priv, seq_diff,
Simon Wunderlich81f02682015-11-23 19:57:22 +01001319 BATADV_TQ_LOCAL_WINDOW_SIZE,
1320 &orig_ifinfo->batman_seqno_reset, NULL)) {
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001321 ret = BATADV_PROTECTED;
Marek Lindnerfc957272011-07-30 12:04:12 +02001322 goto out;
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001323 }
Marek Lindnerfc957272011-07-30 12:04:12 +02001324
1325 rcu_read_lock();
Simon Wunderlich89652332013-11-13 19:14:46 +01001326 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1327 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1328 if_outgoing);
1329 if (!neigh_ifinfo)
1330 continue;
1331
1332 neigh_addr = neigh_node->addr;
1333 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001334 orig_ifinfo->last_real_seqno,
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001335 seqno);
1336
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001337 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
Simon Wunderlich89652332013-11-13 19:14:46 +01001338 neigh_node->if_incoming == if_incoming) {
Marek Lindnerfc957272011-07-30 12:04:12 +02001339 set_mark = 1;
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001340 if (is_dup)
1341 ret = BATADV_NEIGH_DUP;
1342 } else {
Marek Lindnerfc957272011-07-30 12:04:12 +02001343 set_mark = 0;
Simon Wunderlich7c24bbb2013-05-23 13:07:42 +02001344 if (is_dup && (ret != BATADV_NEIGH_DUP))
1345 ret = BATADV_ORIG_DUP;
1346 }
Marek Lindnerfc957272011-07-30 12:04:12 +02001347
1348 /* if the window moved, set the update flag. */
Simon Wunderlich89652332013-11-13 19:14:46 +01001349 bitmap = neigh_ifinfo->bat_iv.real_bits;
Antonio Quartulli0538f752013-09-02 12:15:01 +02001350 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
Sven Eckelmann0f5f9322012-05-12 02:09:25 +02001351 seq_diff, set_mark);
Marek Lindnerfc957272011-07-30 12:04:12 +02001352
Simon Wunderlich89652332013-11-13 19:14:46 +01001353 packet_count = bitmap_weight(bitmap,
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001354 BATADV_TQ_LOCAL_WINDOW_SIZE);
Simon Wunderlich89652332013-11-13 19:14:46 +01001355 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01001356 batadv_neigh_ifinfo_put(neigh_ifinfo);
Marek Lindnerfc957272011-07-30 12:04:12 +02001357 }
1358 rcu_read_unlock();
1359
1360 if (need_update) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001361 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001362 "%s updating last_seqno: old %u, new %u\n",
1363 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1364 orig_ifinfo->last_real_seqno, seqno);
1365 orig_ifinfo->last_real_seqno = seqno;
Marek Lindnerfc957272011-07-30 12:04:12 +02001366 }
1367
Marek Lindnerfc957272011-07-30 12:04:12 +02001368out:
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001369 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
Sven Eckelmann5d967312016-01-17 11:01:09 +01001370 batadv_orig_node_put(orig_node);
Sven Eckelmann35f94772016-01-17 11:01:13 +01001371 batadv_orig_ifinfo_put(orig_ifinfo);
Marek Lindnerfc957272011-07-30 12:04:12 +02001372 return ret;
1373}
1374
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001375/**
1376 * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1377 * @skb: the skb containing the OGM
Martin Hundebøll95298a92014-07-15 09:41:05 +02001378 * @ogm_offset: offset from skb->data to start of ogm header
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001379 * @orig_node: the (cached) orig node for the originator of this OGM
1380 * @if_incoming: the interface where this packet was received
1381 * @if_outgoing: the interface for which the packet should be considered
1382 */
1383static void
1384batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1385 struct batadv_orig_node *orig_node,
1386 struct batadv_hard_iface *if_incoming,
1387 struct batadv_hard_iface *if_outgoing)
1388{
1389 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
Marek Lindner4ff1e2a2015-08-04 21:09:58 +08001390 struct batadv_hardif_neigh_node *hardif_neigh = NULL;
Sven Eckelmann4f248cf2015-06-09 20:50:49 +02001391 struct batadv_neigh_node *router = NULL;
1392 struct batadv_neigh_node *router_router = NULL;
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001393 struct batadv_orig_node *orig_neigh_node;
1394 struct batadv_orig_ifinfo *orig_ifinfo;
1395 struct batadv_neigh_node *orig_neigh_router = NULL;
1396 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1397 struct batadv_ogm_packet *ogm_packet;
1398 enum batadv_dup_status dup_status;
1399 bool is_from_best_next_hop = false;
1400 bool is_single_hop_neigh = false;
1401 bool sameseq, similar_ttl;
1402 struct sk_buff *skb_priv;
1403 struct ethhdr *ethhdr;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001404 u8 *prev_sender;
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001405 int is_bidirect;
1406
1407 /* create a private copy of the skb, as some functions change tq value
1408 * and/or flags.
1409 */
1410 skb_priv = skb_copy(skb, GFP_ATOMIC);
1411 if (!skb_priv)
1412 return;
1413
1414 ethhdr = eth_hdr(skb_priv);
1415 ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1416
1417 dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1418 if_incoming, if_outgoing);
1419 if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1420 is_single_hop_neigh = true;
1421
1422 if (dup_status == BATADV_PROTECTED) {
1423 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1424 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1425 ethhdr->h_source);
1426 goto out;
1427 }
1428
1429 if (ogm_packet->tq == 0) {
1430 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1431 "Drop packet: originator packet with tq equal 0\n");
1432 goto out;
1433 }
1434
Marek Lindner4ff1e2a2015-08-04 21:09:58 +08001435 if (is_single_hop_neigh) {
1436 hardif_neigh = batadv_hardif_neigh_get(if_incoming,
1437 ethhdr->h_source);
1438 if (hardif_neigh)
1439 hardif_neigh->last_seen = jiffies;
1440 }
1441
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001442 router = batadv_orig_router_get(orig_node, if_outgoing);
1443 if (router) {
1444 router_router = batadv_orig_router_get(router->orig_node,
1445 if_outgoing);
1446 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1447 }
1448
1449 if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1450 (batadv_compare_eth(router->addr, ethhdr->h_source)))
1451 is_from_best_next_hop = true;
1452
1453 prev_sender = ogm_packet->prev_sender;
1454 /* avoid temporary routing loops */
1455 if (router && router_router &&
1456 (batadv_compare_eth(router->addr, prev_sender)) &&
1457 !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1458 (batadv_compare_eth(router->addr, router_router->addr))) {
1459 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1460 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1461 ethhdr->h_source);
1462 goto out;
1463 }
1464
1465 if (if_outgoing == BATADV_IF_DEFAULT)
1466 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1467
1468 /* if sender is a direct neighbor the sender mac equals
1469 * originator mac
1470 */
1471 if (is_single_hop_neigh)
1472 orig_neigh_node = orig_node;
1473 else
1474 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1475 ethhdr->h_source);
1476
1477 if (!orig_neigh_node)
1478 goto out;
1479
1480 /* Update nc_nodes of the originator */
1481 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1482 ogm_packet, is_single_hop_neigh);
1483
1484 orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1485 if_outgoing);
1486
1487 /* drop packet if sender is not a direct neighbor and if we
1488 * don't route towards it
1489 */
1490 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1491 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1492 "Drop packet: OGM via unknown neighbor!\n");
1493 goto out_neigh;
1494 }
1495
1496 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1497 ogm_packet, if_incoming,
1498 if_outgoing);
1499
1500 /* update ranking if it is not a duplicate or has the same
1501 * seqno and similar ttl as the non-duplicate
1502 */
1503 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1504 if (!orig_ifinfo)
1505 goto out_neigh;
1506
1507 sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1508 similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1509
1510 if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1511 (sameseq && similar_ttl))) {
1512 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1513 orig_ifinfo, ethhdr,
1514 ogm_packet, if_incoming,
1515 if_outgoing, dup_status);
1516 }
Sven Eckelmann35f94772016-01-17 11:01:13 +01001517 batadv_orig_ifinfo_put(orig_ifinfo);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001518
Simon Wunderlichef0a9372013-11-13 19:14:49 +01001519 /* only forward for specific interface, not for the default one. */
1520 if (if_outgoing == BATADV_IF_DEFAULT)
1521 goto out_neigh;
1522
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001523 /* is single hop (direct) neighbor */
1524 if (is_single_hop_neigh) {
1525 /* OGMs from secondary interfaces should only scheduled once
1526 * per interface where it has been received, not multiple times
1527 */
1528 if ((ogm_packet->ttl <= 2) &&
1529 (if_incoming != if_outgoing)) {
1530 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1531 "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1532 goto out_neigh;
1533 }
1534 /* mark direct link on incoming interface */
1535 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1536 is_single_hop_neigh,
Simon Wunderlichef0a9372013-11-13 19:14:49 +01001537 is_from_best_next_hop, if_incoming,
1538 if_outgoing);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001539
1540 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1541 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1542 goto out_neigh;
1543 }
1544
1545 /* multihop originator */
1546 if (!is_bidirect) {
1547 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1548 "Drop packet: not received via bidirectional link\n");
1549 goto out_neigh;
1550 }
1551
1552 if (dup_status == BATADV_NEIGH_DUP) {
1553 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1554 "Drop packet: duplicate packet received\n");
1555 goto out_neigh;
1556 }
1557
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001558 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1559 "Forwarding packet: rebroadcast originator packet\n");
1560 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1561 is_single_hop_neigh, is_from_best_next_hop,
Simon Wunderlichef0a9372013-11-13 19:14:49 +01001562 if_incoming, if_outgoing);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001563
1564out_neigh:
1565 if ((orig_neigh_node) && (!is_single_hop_neigh))
Sven Eckelmann5d967312016-01-17 11:01:09 +01001566 batadv_orig_node_put(orig_neigh_node);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001567out:
Simon Wunderlichc1e517f2014-03-26 15:46:21 +01001568 if (router_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01001569 batadv_neigh_ifinfo_put(router_ifinfo);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001570 if (router)
Sven Eckelmann25bb2502016-01-17 11:01:11 +01001571 batadv_neigh_node_put(router);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001572 if (router_router)
Sven Eckelmann25bb2502016-01-17 11:01:11 +01001573 batadv_neigh_node_put(router_router);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001574 if (orig_neigh_router)
Sven Eckelmann25bb2502016-01-17 11:01:11 +01001575 batadv_neigh_node_put(orig_neigh_router);
Marek Lindner4ff1e2a2015-08-04 21:09:58 +08001576 if (hardif_neigh)
Sven Eckelmannaccadc32016-01-17 11:01:14 +01001577 batadv_hardif_neigh_put(hardif_neigh);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001578
1579 kfree_skb(skb_priv);
1580}
1581
1582/**
1583 * batadv_iv_ogm_process - process an incoming batman iv OGM
1584 * @skb: the skb containing the OGM
1585 * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1586 * @if_incoming: the interface where this packet was receved
1587 */
1588static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001589 struct batadv_hard_iface *if_incoming)
Marek Lindnerfc957272011-07-30 12:04:12 +02001590{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001591 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001592 struct batadv_orig_node *orig_neigh_node, *orig_node;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001593 struct batadv_hard_iface *hard_iface;
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001594 struct batadv_ogm_packet *ogm_packet;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001595 u32 if_incoming_seqno;
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001596 bool has_directlink_flag;
1597 struct ethhdr *ethhdr;
1598 bool is_my_oldorig = false;
1599 bool is_my_addr = false;
1600 bool is_my_orig = false;
1601
1602 ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1603 ethhdr = eth_hdr(skb);
Marek Lindnerfc957272011-07-30 12:04:12 +02001604
1605 /* Silently drop when the batman packet is actually not a
1606 * correct packet.
1607 *
1608 * This might happen if a packet is padded (e.g. Ethernet has a
1609 * minimum frame length of 64 byte) and the aggregation interprets
1610 * it as an additional length.
1611 *
1612 * TODO: A more sane solution would be to have a bit in the
Sven Eckelmann96412692012-06-05 22:31:30 +02001613 * batadv_ogm_packet to detect whether the packet is the last
Marek Lindnerfc957272011-07-30 12:04:12 +02001614 * packet in an aggregation. Here we expect that the padding
1615 * is always zero (or not 0x01)
1616 */
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001617 if (ogm_packet->packet_type != BATADV_IV_OGM)
Marek Lindnerfc957272011-07-30 12:04:12 +02001618 return;
1619
1620 /* could be changed by schedule_own_packet() */
Marek Lindner14511512012-08-02 17:20:26 +02001621 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
Marek Lindnerfc957272011-07-30 12:04:12 +02001622
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001623 if (ogm_packet->flags & BATADV_DIRECTLINK)
1624 has_directlink_flag = true;
Sven Eckelmannacd34af2012-06-03 22:19:21 +02001625 else
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001626 has_directlink_flag = false;
Marek Lindnerfc957272011-07-30 12:04:12 +02001627
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001628 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Marek Lindnere1bf0c12013-04-23 21:40:01 +08001629 "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, tq %d, TTL %d, V %d, IDF %d)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001630 ethhdr->h_source, if_incoming->net_dev->name,
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001631 if_incoming->net_dev->dev_addr, ogm_packet->orig,
1632 ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1633 ogm_packet->tq, ogm_packet->ttl,
1634 ogm_packet->version, has_directlink_flag);
Marek Lindnerfc957272011-07-30 12:04:12 +02001635
1636 rcu_read_lock();
Sven Eckelmann3193e8f2012-05-12 02:09:42 +02001637 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
Sven Eckelmanne9a4f292012-06-03 22:19:19 +02001638 if (hard_iface->if_status != BATADV_IF_ACTIVE)
Marek Lindnerfc957272011-07-30 12:04:12 +02001639 continue;
1640
1641 if (hard_iface->soft_iface != if_incoming->soft_iface)
1642 continue;
1643
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001644 if (batadv_compare_eth(ethhdr->h_source,
1645 hard_iface->net_dev->dev_addr))
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001646 is_my_addr = true;
Marek Lindnerfc957272011-07-30 12:04:12 +02001647
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001648 if (batadv_compare_eth(ogm_packet->orig,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001649 hard_iface->net_dev->dev_addr))
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001650 is_my_orig = true;
Marek Lindnerfc957272011-07-30 12:04:12 +02001651
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001652 if (batadv_compare_eth(ogm_packet->prev_sender,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001653 hard_iface->net_dev->dev_addr))
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001654 is_my_oldorig = true;
Marek Lindnerfc957272011-07-30 12:04:12 +02001655 }
1656 rcu_read_unlock();
1657
Marek Lindnerfc957272011-07-30 12:04:12 +02001658 if (is_my_addr) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001659 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001660 "Drop packet: received my own broadcast (sender: %pM)\n",
1661 ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +02001662 return;
1663 }
1664
Marek Lindnerfc957272011-07-30 12:04:12 +02001665 if (is_my_orig) {
1666 unsigned long *word;
1667 int offset;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001668 s32 bit_pos;
1669 s16 if_num;
1670 u8 *weight;
Marek Lindnerfc957272011-07-30 12:04:12 +02001671
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001672 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1673 ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +02001674 if (!orig_neigh_node)
1675 return;
1676
1677 /* neighbor has to indicate direct link and it has to
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001678 * come via the corresponding interface
1679 * save packet seqno for bidirectional check
1680 */
Marek Lindnerfc957272011-07-30 12:04:12 +02001681 if (has_directlink_flag &&
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001682 batadv_compare_eth(if_incoming->net_dev->dev_addr,
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001683 ogm_packet->orig)) {
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001684 if_num = if_incoming->if_num;
1685 offset = if_num * BATADV_NUM_WORDS;
Marek Lindnerfc957272011-07-30 12:04:12 +02001686
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001687 spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
Antonio Quartulli32db6aa2014-09-01 14:37:29 +02001688 word = &orig_neigh_node->bat_iv.bcast_own[offset];
Sven Eckelmann9b4a1152012-05-12 13:48:53 +02001689 bit_pos = if_incoming_seqno - 2;
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001690 bit_pos -= ntohl(ogm_packet->seqno);
Sven Eckelmann9b4a1152012-05-12 13:48:53 +02001691 batadv_set_bit(word, bit_pos);
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001692 weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001693 *weight = bitmap_weight(word,
1694 BATADV_TQ_LOCAL_WINDOW_SIZE);
Antonio Quartullibbad0a52013-09-02 12:15:02 +02001695 spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
Marek Lindnerfc957272011-07-30 12:04:12 +02001696 }
1697
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001698 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001699 "Drop packet: originator packet from myself (via neighbor)\n");
Sven Eckelmann5d967312016-01-17 11:01:09 +01001700 batadv_orig_node_put(orig_neigh_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001701 return;
1702 }
1703
1704 if (is_my_oldorig) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001705 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001706 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1707 ethhdr->h_source);
Marek Lindnerfc957272011-07-30 12:04:12 +02001708 return;
1709 }
1710
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001711 if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001712 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001713 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1714 ethhdr->h_source);
Marek Lindner13b25412012-03-11 06:17:53 +08001715 return;
1716 }
1717
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001718 orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
Marek Lindnerfc957272011-07-30 12:04:12 +02001719 if (!orig_node)
1720 return;
1721
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001722 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1723 if_incoming, BATADV_IF_DEFAULT);
Marek Lindnerfc957272011-07-30 12:04:12 +02001724
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001725 rcu_read_lock();
1726 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1727 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1728 continue;
1729
1730 if (hard_iface->soft_iface != bat_priv->soft_iface)
1731 continue;
1732
1733 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1734 if_incoming, hard_iface);
Marek Lindnerfc957272011-07-30 12:04:12 +02001735 }
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001736 rcu_read_unlock();
Marek Lindnerfc957272011-07-30 12:04:12 +02001737
Sven Eckelmann5d967312016-01-17 11:01:09 +01001738 batadv_orig_node_put(orig_node);
Marek Lindnerfc957272011-07-30 12:04:12 +02001739}
1740
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001741static int batadv_iv_ogm_receive(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001742 struct batadv_hard_iface *if_incoming)
Marek Lindnerfc957272011-07-30 12:04:12 +02001743{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001744 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001745 struct batadv_ogm_packet *ogm_packet;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001746 u8 *packet_pos;
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001747 int ogm_offset;
Marek Lindneref261572013-04-23 21:39:57 +08001748 bool ret;
Marek Lindnerc3e29312012-03-04 16:56:25 +08001749
Sven Eckelmann7e071c72012-06-03 22:19:13 +02001750 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
Marek Lindnerc3e29312012-03-04 16:56:25 +08001751 if (!ret)
1752 return NET_RX_DROP;
Marek Lindnerfc957272011-07-30 12:04:12 +02001753
Marek Lindneredbf12b2012-03-11 06:17:49 +08001754 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1755 * that does not have B.A.T.M.A.N. IV enabled ?
1756 */
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02001757 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
Marek Lindneredbf12b2012-03-11 06:17:49 +08001758 return NET_RX_DROP;
1759
Sven Eckelmannd69909d2012-06-03 22:19:20 +02001760 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1761 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
Martin Hundebøllf8214862012-04-20 17:02:45 +02001762 skb->len + ETH_HLEN);
1763
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001764 ogm_offset = 0;
1765 ogm_packet = (struct batadv_ogm_packet *)skb->data;
Marek Lindnerfc957272011-07-30 12:04:12 +02001766
1767 /* unpack the aggregated packets and process them one by one */
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001768 while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1769 ogm_packet->tvlv_len)) {
1770 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
Marek Lindnerfc957272011-07-30 12:04:12 +02001771
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001772 ogm_offset += BATADV_OGM_HLEN;
1773 ogm_offset += ntohs(ogm_packet->tvlv_len);
Marek Lindnerfc957272011-07-30 12:04:12 +02001774
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001775 packet_pos = skb->data + ogm_offset;
1776 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
Marek Lindnerb47506d2013-03-04 10:39:49 +08001777 }
Marek Lindnerc3e29312012-03-04 16:56:25 +08001778
1779 kfree_skb(skb);
1780 return NET_RX_SUCCESS;
Marek Lindnerfc957272011-07-30 12:04:12 +02001781}
Marek Lindner1c280472011-11-28 17:40:17 +08001782
Simon Wunderlich1b371d12014-01-15 21:17:54 +01001783/**
1784 * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
Simon Wunderlich89652332013-11-13 19:14:46 +01001785 * @orig_node: the orig_node for which the neighbors are printed
1786 * @if_outgoing: outgoing interface for these entries
1787 * @seq: debugfs table seq_file struct
1788 *
1789 * Must be called while holding an rcu lock.
1790 */
1791static void
1792batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1793 struct batadv_hard_iface *if_outgoing,
1794 struct seq_file *seq)
1795{
1796 struct batadv_neigh_node *neigh_node;
1797 struct batadv_neigh_ifinfo *n_ifinfo;
1798
1799 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1800 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1801 if (!n_ifinfo)
1802 continue;
1803
1804 seq_printf(seq, " %pM (%3i)",
1805 neigh_node->addr,
1806 n_ifinfo->bat_iv.tq_avg);
1807
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01001808 batadv_neigh_ifinfo_put(n_ifinfo);
Simon Wunderlich89652332013-11-13 19:14:46 +01001809 }
1810}
1811
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001812/**
1813 * batadv_iv_ogm_orig_print - print the originator table
1814 * @bat_priv: the bat priv with all the soft interface information
1815 * @seq: debugfs table seq_file struct
Simon Wunderlichcb1c92e2013-11-21 11:52:16 +01001816 * @if_outgoing: the outgoing interface for which this should be printed
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001817 */
1818static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
Simon Wunderlichcb1c92e2013-11-21 11:52:16 +01001819 struct seq_file *seq,
1820 struct batadv_hard_iface *if_outgoing)
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001821{
Simon Wunderlich89652332013-11-13 19:14:46 +01001822 struct batadv_neigh_node *neigh_node;
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001823 struct batadv_hashtable *hash = bat_priv->orig_hash;
1824 int last_seen_msecs, last_seen_secs;
1825 struct batadv_orig_node *orig_node;
Simon Wunderlich89652332013-11-13 19:14:46 +01001826 struct batadv_neigh_ifinfo *n_ifinfo;
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001827 unsigned long last_seen_jiffies;
1828 struct hlist_head *head;
1829 int batman_count = 0;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001830 u32 i;
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001831
1832 seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1833 "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1834 "Nexthop", "outgoingIF", "Potential nexthops");
1835
1836 for (i = 0; i < hash->size; i++) {
1837 head = &hash->table[i];
1838
1839 rcu_read_lock();
1840 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
Simon Wunderlich7351a4822013-11-13 19:14:47 +01001841 neigh_node = batadv_orig_router_get(orig_node,
Simon Wunderlichcb1c92e2013-11-21 11:52:16 +01001842 if_outgoing);
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001843 if (!neigh_node)
1844 continue;
1845
Simon Wunderlich89652332013-11-13 19:14:46 +01001846 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
Simon Wunderlichcb1c92e2013-11-21 11:52:16 +01001847 if_outgoing);
Simon Wunderlich89652332013-11-13 19:14:46 +01001848 if (!n_ifinfo)
1849 goto next;
1850
1851 if (n_ifinfo->bat_iv.tq_avg == 0)
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001852 goto next;
1853
1854 last_seen_jiffies = jiffies - orig_node->last_seen;
1855 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1856 last_seen_secs = last_seen_msecs / 1000;
1857 last_seen_msecs = last_seen_msecs % 1000;
1858
1859 seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:",
1860 orig_node->orig, last_seen_secs,
Simon Wunderlich89652332013-11-13 19:14:46 +01001861 last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001862 neigh_node->addr,
1863 neigh_node->if_incoming->net_dev->name);
1864
Simon Wunderlichcb1c92e2013-11-21 11:52:16 +01001865 batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1866 seq);
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001867 seq_puts(seq, "\n");
1868 batman_count++;
1869
1870next:
Sven Eckelmann25bb2502016-01-17 11:01:11 +01001871 batadv_neigh_node_put(neigh_node);
Simon Wunderlich89652332013-11-13 19:14:46 +01001872 if (n_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01001873 batadv_neigh_ifinfo_put(n_ifinfo);
Antonio Quartulli737a2a222013-09-02 12:15:03 +02001874 }
1875 rcu_read_unlock();
1876 }
1877
1878 if (batman_count == 0)
1879 seq_puts(seq, "No batman nodes in range ...\n");
1880}
1881
Antonio Quartullia3285a82013-09-02 12:15:04 +02001882/**
Marek Lindner75874052015-08-04 21:09:57 +08001883 * batadv_iv_hardif_neigh_print - print a single hop neighbour node
1884 * @seq: neighbour table seq_file struct
1885 * @hardif_neigh: hardif neighbour information
1886 */
1887static void
1888batadv_iv_hardif_neigh_print(struct seq_file *seq,
1889 struct batadv_hardif_neigh_node *hardif_neigh)
1890{
1891 int last_secs, last_msecs;
1892
1893 last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
1894 last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
1895
1896 seq_printf(seq, " %10s %pM %4i.%03is\n",
1897 hardif_neigh->if_incoming->net_dev->name,
1898 hardif_neigh->addr, last_secs, last_msecs);
1899}
1900
1901/**
1902 * batadv_iv_ogm_neigh_print - print the single hop neighbour list
1903 * @bat_priv: the bat priv with all the soft interface information
1904 * @seq: neighbour table seq_file struct
1905 */
1906static void batadv_iv_neigh_print(struct batadv_priv *bat_priv,
1907 struct seq_file *seq)
1908{
1909 struct net_device *net_dev = (struct net_device *)seq->private;
1910 struct batadv_hardif_neigh_node *hardif_neigh;
1911 struct batadv_hard_iface *hard_iface;
1912 int batman_count = 0;
1913
1914 seq_printf(seq, " %10s %-13s %s\n",
1915 "IF", "Neighbor", "last-seen");
1916
1917 rcu_read_lock();
1918 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1919 if (hard_iface->soft_iface != net_dev)
1920 continue;
1921
1922 hlist_for_each_entry_rcu(hardif_neigh,
1923 &hard_iface->neigh_list, list) {
1924 batadv_iv_hardif_neigh_print(seq, hardif_neigh);
1925 batman_count++;
1926 }
1927 }
1928 rcu_read_unlock();
1929
1930 if (batman_count == 0)
1931 seq_puts(seq, "No batman nodes in range ...\n");
1932}
1933
1934/**
Antonio Quartullia3285a82013-09-02 12:15:04 +02001935 * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1936 * @neigh1: the first neighbor object of the comparison
Simon Wunderlich89652332013-11-13 19:14:46 +01001937 * @if_outgoing1: outgoing interface for the first neighbor
Antonio Quartullia3285a82013-09-02 12:15:04 +02001938 * @neigh2: the second neighbor object of the comparison
Simon Wunderlich89652332013-11-13 19:14:46 +01001939 * @if_outgoing2: outgoing interface for the second neighbor
Antonio Quartullia3285a82013-09-02 12:15:04 +02001940 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +02001941 * Return: a value less, equal to or greater than 0 if the metric via neigh1 is
Antonio Quartullia3285a82013-09-02 12:15:04 +02001942 * lower, the same as or higher than the metric via neigh2
1943 */
1944static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
Simon Wunderlich89652332013-11-13 19:14:46 +01001945 struct batadv_hard_iface *if_outgoing1,
1946 struct batadv_neigh_node *neigh2,
1947 struct batadv_hard_iface *if_outgoing2)
Antonio Quartullia3285a82013-09-02 12:15:04 +02001948{
Simon Wunderlich89652332013-11-13 19:14:46 +01001949 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001950 u8 tq1, tq2;
Simon Wunderlich89652332013-11-13 19:14:46 +01001951 int diff;
Antonio Quartullia3285a82013-09-02 12:15:04 +02001952
Simon Wunderlich89652332013-11-13 19:14:46 +01001953 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1954 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
Antonio Quartullia3285a82013-09-02 12:15:04 +02001955
Simon Wunderlich89652332013-11-13 19:14:46 +01001956 if (!neigh1_ifinfo || !neigh2_ifinfo) {
1957 diff = 0;
1958 goto out;
1959 }
1960
1961 tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1962 tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1963 diff = tq1 - tq2;
1964
1965out:
1966 if (neigh1_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01001967 batadv_neigh_ifinfo_put(neigh1_ifinfo);
Simon Wunderlich89652332013-11-13 19:14:46 +01001968 if (neigh2_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01001969 batadv_neigh_ifinfo_put(neigh2_ifinfo);
Simon Wunderlich89652332013-11-13 19:14:46 +01001970
1971 return diff;
Antonio Quartullia3285a82013-09-02 12:15:04 +02001972}
1973
Antonio Quartullic43c9812013-09-02 12:15:05 +02001974/**
Simon Wunderlich18165f62015-08-08 02:01:50 +02001975 * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better
1976 * than neigh2 from the metric prospective
Antonio Quartullic43c9812013-09-02 12:15:05 +02001977 * @neigh1: the first neighbor object of the comparison
Martin Hundebøll95298a92014-07-15 09:41:05 +02001978 * @if_outgoing1: outgoing interface for the first neighbor
Antonio Quartullic43c9812013-09-02 12:15:05 +02001979 * @neigh2: the second neighbor object of the comparison
Simon Wunderlich89652332013-11-13 19:14:46 +01001980 * @if_outgoing2: outgoing interface for the second neighbor
Martin Hundebøll95298a92014-07-15 09:41:05 +02001981 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +02001982 * Return: true if the metric via neigh1 is equally good or better than
Simon Wunderlich89652332013-11-13 19:14:46 +01001983 * the metric via neigh2, false otherwise.
1984 */
1985static bool
Simon Wunderlich18165f62015-08-08 02:01:50 +02001986batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1,
Simon Wunderlich89652332013-11-13 19:14:46 +01001987 struct batadv_hard_iface *if_outgoing1,
1988 struct batadv_neigh_node *neigh2,
1989 struct batadv_hard_iface *if_outgoing2)
1990{
1991 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001992 u8 tq1, tq2;
Simon Wunderlich89652332013-11-13 19:14:46 +01001993 bool ret;
1994
1995 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1996 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1997
1998 /* we can't say that the metric is better */
1999 if (!neigh1_ifinfo || !neigh2_ifinfo) {
2000 ret = false;
2001 goto out;
2002 }
2003
2004 tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2005 tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2006 ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
2007
2008out:
2009 if (neigh1_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01002010 batadv_neigh_ifinfo_put(neigh1_ifinfo);
Simon Wunderlich89652332013-11-13 19:14:46 +01002011 if (neigh2_ifinfo)
Sven Eckelmann044fa3a2016-01-17 11:01:12 +01002012 batadv_neigh_ifinfo_put(neigh2_ifinfo);
Simon Wunderlich89652332013-11-13 19:14:46 +01002013
2014 return ret;
Antonio Quartullic43c9812013-09-02 12:15:05 +02002015}
2016
Sven Eckelmann56303d32012-06-05 22:31:31 +02002017static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
Marek Lindner519d3492012-04-18 17:15:57 +08002018 .name = "BATMAN_IV",
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02002019 .bat_iface_enable = batadv_iv_ogm_iface_enable,
2020 .bat_iface_disable = batadv_iv_ogm_iface_disable,
2021 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
2022 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
2023 .bat_ogm_schedule = batadv_iv_ogm_schedule,
2024 .bat_ogm_emit = batadv_iv_ogm_emit,
Antonio Quartullia3285a82013-09-02 12:15:04 +02002025 .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
Simon Wunderlich18165f62015-08-08 02:01:50 +02002026 .bat_neigh_is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
Marek Lindner75874052015-08-04 21:09:57 +08002027 .bat_neigh_print = batadv_iv_neigh_print,
Antonio Quartulli737a2a222013-09-02 12:15:03 +02002028 .bat_orig_print = batadv_iv_ogm_orig_print,
Antonio Quartullid0015fd2013-09-03 11:10:23 +02002029 .bat_orig_free = batadv_iv_ogm_orig_free,
2030 .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
2031 .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
Marek Lindner1c280472011-11-28 17:40:17 +08002032};
2033
Sven Eckelmann81c524f2012-05-12 02:09:22 +02002034int __init batadv_iv_init(void)
Marek Lindner1c280472011-11-28 17:40:17 +08002035{
Marek Lindnerc3e29312012-03-04 16:56:25 +08002036 int ret;
2037
2038 /* batman originator packet */
Sven Eckelmannacd34af2012-06-03 22:19:21 +02002039 ret = batadv_recv_handler_register(BATADV_IV_OGM,
2040 batadv_iv_ogm_receive);
Marek Lindnerc3e29312012-03-04 16:56:25 +08002041 if (ret < 0)
2042 goto out;
2043
Sven Eckelmannfe8bc392012-05-12 18:33:51 +02002044 ret = batadv_algo_register(&batadv_batman_iv);
Marek Lindnerc3e29312012-03-04 16:56:25 +08002045 if (ret < 0)
2046 goto handler_unregister;
2047
2048 goto out;
2049
2050handler_unregister:
Sven Eckelmannacd34af2012-06-03 22:19:21 +02002051 batadv_recv_handler_unregister(BATADV_IV_OGM);
Marek Lindnerc3e29312012-03-04 16:56:25 +08002052out:
2053 return ret;
Marek Lindner1c280472011-11-28 17:40:17 +08002054}