55 строки
1.8 KiB
C
55 строки
1.8 KiB
C
/* Copyright (C) 2006-2013 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
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA
|
|
*/
|
|
|
|
#ifndef _NET_BATMAN_ADV_BITARRAY_H_
|
|
#define _NET_BATMAN_ADV_BITARRAY_H_
|
|
|
|
/* Returns 1 if the corresponding bit in the given seq_bits indicates true
|
|
* and curr_seqno is within range of last_seqno. Otherwise returns 0.
|
|
*/
|
|
static inline int batadv_test_bit(const unsigned long *seq_bits,
|
|
uint32_t last_seqno, uint32_t curr_seqno)
|
|
{
|
|
int32_t diff;
|
|
|
|
diff = last_seqno - curr_seqno;
|
|
if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
|
|
return 0;
|
|
else
|
|
return test_bit(diff, seq_bits) != 0;
|
|
}
|
|
|
|
/* turn corresponding bit on, so we can remember that we got the packet */
|
|
static inline void batadv_set_bit(unsigned long *seq_bits, int32_t 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 */
|
|
}
|
|
|
|
/* receive and process one packet, returns 1 if received seq_num is considered
|
|
* new, 0 if old
|
|
*/
|
|
int batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
|
|
int32_t seq_num_diff, int set_mark);
|
|
|
|
#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */
|