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7db7d9f3 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
7a79d717 | 2 | /* Copyright (C) 2006-2019 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
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 | |
ebf38fb7 | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
17 | */ |
18 | ||
19 | #ifndef _NET_BATMAN_ADV_BITARRAY_H_ | |
20 | #define _NET_BATMAN_ADV_BITARRAY_H_ | |
21 | ||
1e2c2a4f SE |
22 | #include "main.h" |
23 | ||
24 | #include <linux/bitops.h> | |
25 | #include <linux/compiler.h> | |
4b426b10 | 26 | #include <linux/stddef.h> |
1e2c2a4f SE |
27 | #include <linux/types.h> |
28 | ||
62fe710f | 29 | /** |
7e9a8c2c | 30 | * batadv_test_bit() - check if bit is set in the current window |
7afcbbef SE |
31 | * |
32 | * @seq_bits: pointer to the sequence number receive packet | |
33 | * @last_seqno: latest sequence number in seq_bits | |
34 | * @curr_seqno: sequence number to test for | |
62fe710f | 35 | * |
4b426b10 SE |
36 | * Return: true if the corresponding bit in the given seq_bits indicates true |
37 | * and curr_seqno is within range of last_seqno. Otherwise returns false. | |
9cfc7bd6 | 38 | */ |
4b426b10 SE |
39 | static inline bool batadv_test_bit(const unsigned long *seq_bits, |
40 | u32 last_seqno, u32 curr_seqno) | |
0079d2ce | 41 | { |
6b5e971a | 42 | s32 diff; |
0079d2ce SE |
43 | |
44 | diff = last_seqno - curr_seqno; | |
42d0b044 | 45 | if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE) |
4b426b10 | 46 | return false; |
24820df1 | 47 | return test_bit(diff, seq_bits) != 0; |
0079d2ce | 48 | } |
c6c8fea2 | 49 | |
e57acf8e SE |
50 | /** |
51 | * batadv_set_bit() - Turn corresponding bit on, so we can remember that we got | |
52 | * the packet | |
53 | * @seq_bits: bitmap of the packet receive window | |
54 | * @n: relative sequence number of newly received packet | |
55 | */ | |
6b5e971a | 56 | static inline void batadv_set_bit(unsigned long *seq_bits, s32 n) |
0079d2ce SE |
57 | { |
58 | /* if too old, just drop it */ | |
42d0b044 | 59 | if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE) |
0079d2ce | 60 | return; |
c6c8fea2 | 61 | |
0079d2ce SE |
62 | set_bit(n, seq_bits); /* turn the position on */ |
63 | } | |
c6c8fea2 | 64 | |
4b426b10 SE |
65 | bool batadv_bit_get_packet(void *priv, unsigned long *seq_bits, |
66 | s32 seq_num_diff, int set_mark); | |
c6c8fea2 | 67 | |
c6c8fea2 | 68 | #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */ |