1 /* 2 * Copyright (C) 2006-2012 B.A.T.M.A.N. contributors: 3 * 4 * Simon Wunderlich, Marek Lindner 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of version 2 of the GNU General Public 8 * License as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 18 * 02110-1301, USA 19 * 20 */ 21 22 #ifndef _NET_BATMAN_ADV_BITARRAY_H_ 23 #define _NET_BATMAN_ADV_BITARRAY_H_ 24 25 /* returns true if the corresponding bit in the given seq_bits indicates true 26 * and curr_seqno is within range of last_seqno */ 27 static inline int bat_test_bit(const unsigned long *seq_bits, 28 uint32_t last_seqno, uint32_t curr_seqno) 29 { 30 int32_t diff; 31 32 diff = last_seqno - curr_seqno; 33 if (diff < 0 || diff >= TQ_LOCAL_WINDOW_SIZE) 34 return 0; 35 else 36 return test_bit(diff, seq_bits); 37 } 38 39 /* turn corresponding bit on, so we can remember that we got the packet */ 40 static inline void bat_set_bit(unsigned long *seq_bits, int32_t n) 41 { 42 /* if too old, just drop it */ 43 if (n < 0 || n >= TQ_LOCAL_WINDOW_SIZE) 44 return; 45 46 set_bit(n, seq_bits); /* turn the position on */ 47 } 48 49 /* receive and process one packet, returns 1 if received seq_num is considered 50 * new, 0 if old */ 51 int 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