1/* Copyright (C) 2006-2014 B.A.T.M.A.N. contributors:
2 *
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, see <http://www.gnu.org/licenses/>.
16 */
17
18#ifndef _NET_BATMAN_ADV_BITARRAY_H_
19#define _NET_BATMAN_ADV_BITARRAY_H_
20
21/* Returns 1 if the corresponding bit in the given seq_bits indicates true
22 * and curr_seqno is within range of last_seqno. Otherwise returns 0.
23 */
24static inline int batadv_test_bit(const unsigned long *seq_bits,
25				  uint32_t last_seqno, uint32_t curr_seqno)
26{
27	int32_t diff;
28
29	diff = last_seqno - curr_seqno;
30	if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
31		return 0;
32	return test_bit(diff, seq_bits) != 0;
33}
34
35/* turn corresponding bit on, so we can remember that we got the packet */
36static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n)
37{
38	/* if too old, just drop it */
39	if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
40		return;
41
42	set_bit(n, seq_bits); /* turn the position on */
43}
44
45/* receive and process one packet, returns 1 if received seq_num is considered
46 * new, 0 if old
47 */
48int batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
49			  int32_t seq_num_diff, int set_mark);
50
51#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */
52