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e19f9759 | 1 | /* Copyright (C) 2006-2014 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
18 | #ifndef _NET_BATMAN_ADV_BITARRAY_H_ | |
19 | #define _NET_BATMAN_ADV_BITARRAY_H_ | |
20 | ||
dbd6b11e LL |
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. | |
9cfc7bd6 | 23 | */ |
9b4a1159 SE |
24 | static inline int batadv_test_bit(const unsigned long *seq_bits, |
25 | uint32_t last_seqno, uint32_t curr_seqno) | |
0079d2ce SE |
26 | { |
27 | int32_t diff; | |
28 | ||
29 | diff = last_seqno - curr_seqno; | |
42d0b044 | 30 | if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE) |
0079d2ce SE |
31 | return 0; |
32 | else | |
dbd6b11e | 33 | return test_bit(diff, seq_bits) != 0; |
0079d2ce | 34 | } |
c6c8fea2 SE |
35 | |
36 | /* turn corresponding bit on, so we can remember that we got the packet */ | |
9b4a1159 | 37 | static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n) |
0079d2ce SE |
38 | { |
39 | /* if too old, just drop it */ | |
42d0b044 | 40 | if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE) |
0079d2ce | 41 | return; |
c6c8fea2 | 42 | |
0079d2ce SE |
43 | set_bit(n, seq_bits); /* turn the position on */ |
44 | } | |
c6c8fea2 SE |
45 | |
46 | /* receive and process one packet, returns 1 if received seq_num is considered | |
9cfc7bd6 SE |
47 | * new, 0 if old |
48 | */ | |
0f5f9322 SE |
49 | int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, |
50 | int32_t seq_num_diff, int set_mark); | |
c6c8fea2 | 51 | |
c6c8fea2 | 52 | #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */ |