linux/net/batman-adv/bitarray.h
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   1/* Copyright (C) 2006-2012 B.A.T.M.A.N. contributors:
   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
  18 */
  19
  20#ifndef _NET_BATMAN_ADV_BITARRAY_H_
  21#define _NET_BATMAN_ADV_BITARRAY_H_
  22
  23/* Returns 1 if the corresponding bit in the given seq_bits indicates true
  24 * and curr_seqno is within range of last_seqno. Otherwise returns 0.
  25 */
  26static inline int batadv_test_bit(const unsigned long *seq_bits,
  27                                  uint32_t last_seqno, uint32_t curr_seqno)
  28{
  29        int32_t diff;
  30
  31        diff = last_seqno - curr_seqno;
  32        if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
  33                return 0;
  34        else
  35                return test_bit(diff, seq_bits) != 0;
  36}
  37
  38/* turn corresponding bit on, so we can remember that we got the packet */
  39static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n)
  40{
  41        /* if too old, just drop it */
  42        if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
  43                return;
  44
  45        set_bit(n, seq_bits); /* turn the position on */
  46}
  47
  48/* receive and process one packet, returns 1 if received seq_num is considered
  49 * new, 0 if old
  50 */
  51int batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
  52                          int32_t seq_num_diff, int set_mark);
  53
  54#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */
  55
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