Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 1 | /* Copyright (C) 2006-2012 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 |
| 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 |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 18 | */ |
| 19 | |
| 20 | #ifndef _NET_BATMAN_ADV_BITARRAY_H_ |
| 21 | #define _NET_BATMAN_ADV_BITARRAY_H_ |
| 22 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 23 | /* returns true if the corresponding bit in the given seq_bits indicates true |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 24 | * and curr_seqno is within range of last_seqno |
| 25 | */ |
Sven Eckelmann | 9b4a115 | 2012-05-12 13:48:53 +0200 | [diff] [blame] | 26 | static inline int batadv_test_bit(const unsigned long *seq_bits, |
| 27 | uint32_t last_seqno, uint32_t curr_seqno) |
Sven Eckelmann | 0079d2c | 2012-02-04 17:34:52 +0100 | [diff] [blame] | 28 | { |
| 29 | int32_t diff; |
| 30 | |
| 31 | diff = last_seqno - curr_seqno; |
| 32 | if (diff < 0 || diff >= TQ_LOCAL_WINDOW_SIZE) |
| 33 | return 0; |
| 34 | else |
| 35 | return test_bit(diff, seq_bits); |
| 36 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 37 | |
| 38 | /* 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] | 39 | 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] | 40 | { |
| 41 | /* if too old, just drop it */ |
| 42 | if (n < 0 || n >= TQ_LOCAL_WINDOW_SIZE) |
| 43 | return; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 44 | |
Sven Eckelmann | 0079d2c | 2012-02-04 17:34:52 +0100 | [diff] [blame] | 45 | set_bit(n, seq_bits); /* turn the position on */ |
| 46 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 47 | |
| 48 | /* 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] | 49 | * new, 0 if old |
| 50 | */ |
Sven Eckelmann | 0f5f932 | 2012-05-12 02:09:25 +0200 | [diff] [blame] | 51 | int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, |
| 52 | int32_t seq_num_diff, int set_mark); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 53 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 54 | #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */ |