1 /* Copyright (C) 2006-2014 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, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #ifndef _NET_BATMAN_ADV_BITARRAY_H_ 19 #define _NET_BATMAN_ADV_BITARRAY_H_ 20 21 /* Returns 1 if the corresponding bit in the given seq_bits indicates true 22 * and curr_seqno is within range of last_seqno. Otherwise returns 0. 23 */ 24 static inline int batadv_test_bit(const unsigned long *seq_bits, 25 uint32_t last_seqno, uint32_t curr_seqno) 26 { 27 int32_t diff; 28 29 diff = last_seqno - curr_seqno; 30 if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE) 31 return 0; 32 return test_bit(diff, seq_bits) != 0; 33 } 34 35 /* turn corresponding bit on, so we can remember that we got the packet */ 36 static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n) 37 { 38 /* if too old, just drop it */ 39 if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE) 40 return; 41 42 set_bit(n, seq_bits); /* turn the position on */ 43 } 44 45 /* receive and process one packet, returns 1 if received seq_num is considered 46 * new, 0 if old 47 */ 48 int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, 49 int32_t seq_num_diff, int set_mark); 50 51 #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */ 52