blob: 48f6832895318ee2ec43745314cb7ef3aeda4fbe [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2006-2018 B.A.T.M.A.N. contributors:
* Simon Wunderlich, Marek Lindner
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <>.
#include "main.h"
#include <linux/bitops.h>
#include <linux/compiler.h>
#include <linux/stddef.h>
#include <linux/types.h>
* batadv_test_bit() - check if bit is set in the current window
* @seq_bits: pointer to the sequence number receive packet
* @last_seqno: latest sequence number in seq_bits
* @curr_seqno: sequence number to test for
* Return: true if the corresponding bit in the given seq_bits indicates true
* and curr_seqno is within range of last_seqno. Otherwise returns false.
static inline bool batadv_test_bit(const unsigned long *seq_bits,
u32 last_seqno, u32 curr_seqno)
s32 diff;
diff = last_seqno - curr_seqno;
if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
return false;
return test_bit(diff, seq_bits) != 0;
* batadv_set_bit() - Turn corresponding bit on, so we can remember that we got
* the packet
* @seq_bits: bitmap of the packet receive window
* @n: relative sequence number of newly received packet
static inline void batadv_set_bit(unsigned long *seq_bits, s32 n)
/* if too old, just drop it */
if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
set_bit(n, seq_bits); /* turn the position on */
bool batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
s32 seq_num_diff, int set_mark);