1 /* Copyright (C) 2006-2013 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, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
18 */
19
20 #ifndef _NET_BATMAN_ADV_BITARRAY_H_
21 #define _NET_BATMAN_ADV_BITARRAY_H_
22
23 /* 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.
25 */
batadv_test_bit(const unsigned long * seq_bits,uint32_t last_seqno,uint32_t curr_seqno)26 static inline int batadv_test_bit(const unsigned long *seq_bits,
27 uint32_t last_seqno, uint32_t curr_seqno)
28 {
29 int32_t diff;
30
31 diff = last_seqno - curr_seqno;
32 if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
33 return 0;
34 else
35 return test_bit(diff, seq_bits) != 0;
36 }
37
38 /* turn corresponding bit on, so we can remember that we got the packet */
batadv_set_bit(unsigned long * seq_bits,int32_t n)39 static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n)
40 {
41 /* if too old, just drop it */
42 if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
43 return;
44
45 set_bit(n, seq_bits); /* turn the position on */
46 }
47
48 /* receive and process one packet, returns 1 if received seq_num is considered
49 * new, 0 if old
50 */
51 int batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
52 int32_t seq_num_diff, int set_mark);
53
54 #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */
55