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Antonio Quartulli0b873932013-01-04 03:05:31 +01001/* Copyright (C) 2006-2013 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
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000018 */
19
20#ifndef _NET_BATMAN_ADV_BITARRAY_H_
21#define _NET_BATMAN_ADV_BITARRAY_H_
22
Linus Lüssingdbd6b112012-09-14 00:40:54 +000023/* Returns 1 if the corresponding bit in the given seq_bits indicates true
24 * and curr_seqno is within range of last_seqno. Otherwise returns 0.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +020025 */
Sven Eckelmann9b4a1152012-05-12 13:48:53 +020026static inline int batadv_test_bit(const unsigned long *seq_bits,
27 uint32_t last_seqno, uint32_t curr_seqno)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010028{
29 int32_t diff;
30
31 diff = last_seqno - curr_seqno;
Sven Eckelmann42d0b042012-06-03 22:19:17 +020032 if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010033 return 0;
34 else
Linus Lüssingdbd6b112012-09-14 00:40:54 +000035 return test_bit(diff, seq_bits) != 0;
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010036}
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000037
38/* turn corresponding bit on, so we can remember that we got the packet */
Sven Eckelmann9b4a1152012-05-12 13:48:53 +020039static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010040{
41 /* if too old, just drop it */
Sven Eckelmann42d0b042012-06-03 22:19:17 +020042 if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010043 return;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000044
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010045 set_bit(n, seq_bits); /* turn the position on */
46}
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000047
48/* receive and process one packet, returns 1 if received seq_num is considered
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +020049 * new, 0 if old
50 */
Sven Eckelmann0f5f9322012-05-12 02:09:25 +020051int batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
52 int32_t seq_num_diff, int set_mark);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000053
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000054#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */