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Sven Eckelmann0046b042016-01-01 00:01:03 +01001/* Copyright (C) 2006-2016 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00002 *
3 * Simon Wunderlich, Marek Lindner
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
Antonio Quartulliebf38fb2013-11-03 20:40:48 +010015 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000016 */
17
18#ifndef _NET_BATMAN_ADV_BITARRAY_H_
19#define _NET_BATMAN_ADV_BITARRAY_H_
20
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020021#include "main.h"
22
23#include <linux/bitops.h>
24#include <linux/compiler.h>
25#include <linux/types.h>
26
Sven Eckelmann62fe7102015-09-15 19:00:48 +020027/**
Sven Eckelmann7afcbbe2015-10-31 12:29:29 +010028 * batadv_test_bit - check if bit is set in the current window
29 *
30 * @seq_bits: pointer to the sequence number receive packet
31 * @last_seqno: latest sequence number in seq_bits
32 * @curr_seqno: sequence number to test for
Sven Eckelmann62fe7102015-09-15 19:00:48 +020033 *
34 * Return: 1 if the corresponding bit in the given seq_bits indicates true
Linus Lüssingdbd6b112012-09-14 00:40:54 +000035 * and curr_seqno is within range of last_seqno. Otherwise returns 0.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +020036 */
Sven Eckelmann9b4a1152012-05-12 13:48:53 +020037static inline int batadv_test_bit(const unsigned long *seq_bits,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020038 u32 last_seqno, u32 curr_seqno)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010039{
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020040 s32 diff;
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010041
42 diff = last_seqno - curr_seqno;
Sven Eckelmann42d0b042012-06-03 22:19:17 +020043 if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010044 return 0;
Antonio Quartulli24820df2014-09-01 14:37:25 +020045 return test_bit(diff, seq_bits) != 0;
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010046}
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000047
48/* turn corresponding bit on, so we can remember that we got the packet */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020049static inline void batadv_set_bit(unsigned long *seq_bits, s32 n)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010050{
51 /* if too old, just drop it */
Sven Eckelmann42d0b042012-06-03 22:19:17 +020052 if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010053 return;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000054
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010055 set_bit(n, seq_bits); /* turn the position on */
56}
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000057
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020058int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, s32 seq_num_diff,
59 int set_mark);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000060
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000061#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */