Sven Eckelmann | 9f6446c | 2015-04-23 13:16:35 +0200 | [diff] [blame^] | 1 | /* Copyright (C) 2006-2015 B.A.T.M.A.N. contributors: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 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 |
Antonio Quartulli | ebf38fb | 2013-11-03 20:40:48 +0100 | [diff] [blame] | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 16 | */ |
| 17 | |
| 18 | #ifndef _NET_BATMAN_ADV_BITARRAY_H_ |
| 19 | #define _NET_BATMAN_ADV_BITARRAY_H_ |
| 20 | |
Linus Lüssing | dbd6b11 | 2012-09-14 00:40:54 +0000 | [diff] [blame] | 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. |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 23 | */ |
Sven Eckelmann | 9b4a115 | 2012-05-12 13:48:53 +0200 | [diff] [blame] | 24 | static inline int batadv_test_bit(const unsigned long *seq_bits, |
| 25 | uint32_t last_seqno, uint32_t curr_seqno) |
Sven Eckelmann | 0079d2c | 2012-02-04 17:34:52 +0100 | [diff] [blame] | 26 | { |
| 27 | int32_t diff; |
| 28 | |
| 29 | diff = last_seqno - curr_seqno; |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 30 | if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE) |
Sven Eckelmann | 0079d2c | 2012-02-04 17:34:52 +0100 | [diff] [blame] | 31 | return 0; |
Antonio Quartulli | 24820df | 2014-09-01 14:37:25 +0200 | [diff] [blame] | 32 | return test_bit(diff, seq_bits) != 0; |
Sven Eckelmann | 0079d2c | 2012-02-04 17:34:52 +0100 | [diff] [blame] | 33 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 34 | |
| 35 | /* turn corresponding bit on, so we can remember that we got the packet */ |
Sven Eckelmann | 9b4a115 | 2012-05-12 13:48:53 +0200 | [diff] [blame] | 36 | static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n) |
Sven Eckelmann | 0079d2c | 2012-02-04 17:34:52 +0100 | [diff] [blame] | 37 | { |
| 38 | /* if too old, just drop it */ |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 39 | if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE) |
Sven Eckelmann | 0079d2c | 2012-02-04 17:34:52 +0100 | [diff] [blame] | 40 | return; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 41 | |
Sven Eckelmann | 0079d2c | 2012-02-04 17:34:52 +0100 | [diff] [blame] | 42 | set_bit(n, seq_bits); /* turn the position on */ |
| 43 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 44 | |
| 45 | /* receive and process one packet, returns 1 if received seq_num is considered |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 46 | * new, 0 if old |
| 47 | */ |
Sven Eckelmann | 0f5f932 | 2012-05-12 02:09:25 +0200 | [diff] [blame] | 48 | int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, |
| 49 | int32_t seq_num_diff, int set_mark); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 50 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 51 | #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */ |