/* SPDX-License-Identifier: GPL-2.0 */ /* Copyright (C) B.A.T.M.A.N. contributors: * * Simon Wunderlich, Marek Lindner */ #ifndef _NET_BATMAN_ADV_BITARRAY_H_ #define _NET_BATMAN_ADV_BITARRAY_H_ #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) return; 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); #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */