1 /* Copyright (C) 2006-2013 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 */ 26 static 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 */ 39 static 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 */ 51 int 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