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Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001/*
Sven Eckelmann567db7b2012-01-01 00:41:38 +01002 * Copyright (C) 2006-2012 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
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA
19 *
20 */
21
22#ifndef _NET_BATMAN_ADV_BITARRAY_H_
23#define _NET_BATMAN_ADV_BITARRAY_H_
24
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000025/* returns true if the corresponding bit in the given seq_bits indicates true
26 * and curr_seqno is within range of last_seqno */
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010027static inline int bat_test_bit(const unsigned long *seq_bits,
28 uint32_t last_seqno, uint32_t curr_seqno)
29{
30 int32_t diff;
31
32 diff = last_seqno - curr_seqno;
33 if (diff < 0 || diff >= TQ_LOCAL_WINDOW_SIZE)
34 return 0;
35 else
36 return test_bit(diff, seq_bits);
37}
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000038
39/* turn corresponding bit on, so we can remember that we got the packet */
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010040static inline void bat_set_bit(unsigned long *seq_bits, int32_t n)
41{
42 /* if too old, just drop it */
43 if (n < 0 || n >= TQ_LOCAL_WINDOW_SIZE)
44 return;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000045
Sven Eckelmann0079d2c2012-02-04 17:34:52 +010046 set_bit(n, seq_bits); /* turn the position on */
47}
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000048
49/* receive and process one packet, returns 1 if received seq_num is considered
50 * new, 0 if old */
Sven Eckelmannb4e17052011-06-15 09:41:37 +020051int 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_ */