1 files changed, 51 insertions, 0 deletions
diff --git a/net/batman-adv/bitarray.h b/net/batman-adv/bitarray.h
new file mode 100644
index 000000000..2acaafe60
--- /dev/null
+++ b/net/batman-adv/bitarray.h
@@ -0,0 +1,51 @@
+/* Copyright (C) 2006-2014 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#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;
+	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_ */