69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2006-2017 B.A.T.M.A.N. contributors:
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*
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* Simon Wunderlich, Marek Lindner
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _NET_BATMAN_ADV_BITARRAY_H_
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#define _NET_BATMAN_ADV_BITARRAY_H_
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#include "main.h"
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#include <linux/bitops.h>
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#include <linux/compiler.h>
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#include <linux/stddef.h>
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#include <linux/types.h>
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/**
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* batadv_test_bit() - check if bit is set in the current window
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*
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* @seq_bits: pointer to the sequence number receive packet
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* @last_seqno: latest sequence number in seq_bits
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* @curr_seqno: sequence number to test for
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*
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* Return: true if the corresponding bit in the given seq_bits indicates true
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* and curr_seqno is within range of last_seqno. Otherwise returns false.
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*/
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static inline bool batadv_test_bit(const unsigned long *seq_bits,
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u32 last_seqno, u32 curr_seqno)
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{
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s32 diff;
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diff = last_seqno - curr_seqno;
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if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
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return false;
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return test_bit(diff, seq_bits) != 0;
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}
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/**
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* batadv_set_bit() - Turn corresponding bit on, so we can remember that we got
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* the packet
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* @seq_bits: bitmap of the packet receive window
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* @n: relative sequence number of newly received packet
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*/
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static inline void batadv_set_bit(unsigned long *seq_bits, s32 n)
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{
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/* if too old, just drop it */
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if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
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return;
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set_bit(n, seq_bits); /* turn the position on */
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}
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bool batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
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s32 seq_num_diff, int set_mark);
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#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */
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