blob: 0508353fa28d75c33aee6d6951029423beb690ae [file] [log] [blame]
Sven Eckelmann7db7d9f2017-11-19 15:05:11 +01001/* SPDX-License-Identifier: GPL-2.0 */
Sven Eckelmannac79cbb2017-01-01 00:00:00 +01002/* Copyright (C) 2006-2017 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00003 *
4 * Simon Wunderlich, Marek Lindner
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
Antonio Quartulliebf38fb2013-11-03 20:40:48 +010016 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000017 */
18
19#ifndef _NET_BATMAN_ADV_BITARRAY_H_
20#define _NET_BATMAN_ADV_BITARRAY_H_
21
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020022#include "main.h"
23
24#include <linux/bitops.h>
25#include <linux/compiler.h>
Sven Eckelmann4b426b12016-02-22 21:02:39 +010026#include <linux/stddef.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020027#include <linux/types.h>
28
Sven Eckelmann62fe7102015-09-15 19:00:48 +020029/**
Sven Eckelmann7e9a8c22017-12-02 19:51:47 +010030 * batadv_test_bit() - check if bit is set in the current window
Sven Eckelmann7afcbbe2015-10-31 12:29:29 +010031 *
32 * @seq_bits: pointer to the sequence number receive packet
33 * @last_seqno: latest sequence number in seq_bits
34 * @curr_seqno: sequence number to test for
Sven Eckelmann62fe7102015-09-15 19:00:48 +020035 *
Sven Eckelmann4b426b12016-02-22 21:02:39 +010036 * Return: true if the corresponding bit in the given seq_bits indicates true
37 * and curr_seqno is within range of last_seqno. Otherwise returns false.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +020038 */
Sven Eckelmann4b426b12016-02-22 21:02:39 +010039static inline bool batadv_test_bit(const unsigned long *seq_bits,
40 u32 last_seqno, u32 curr_seqno)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010041{
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020042 s32 diff;
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010043
44 diff = last_seqno - curr_seqno;
Sven Eckelmann42d0b042012-06-03 22:19:17 +020045 if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
Sven Eckelmann4b426b12016-02-22 21:02:39 +010046 return false;
Antonio Quartulli24820df2014-09-01 14:37:25 +020047 return test_bit(diff, seq_bits) != 0;
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010048}
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000049
50/* turn corresponding bit on, so we can remember that we got the packet */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020051static inline void batadv_set_bit(unsigned long *seq_bits, s32 n)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010052{
53 /* if too old, just drop it */
Sven Eckelmann42d0b042012-06-03 22:19:17 +020054 if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010055 return;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000056
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010057 set_bit(n, seq_bits); /* turn the position on */
58}
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000059
Sven Eckelmann4b426b12016-02-22 21:02:39 +010060bool batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
61 s32 seq_num_diff, int set_mark);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000062
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000063#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */