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-rw-r--r--net/dccp/dccp.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index d00a2f4ee5d..a5c5475724c 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -5,7 +5,7 @@
*
* An implementation of the DCCP protocol
* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
- * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
+ * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as
@@ -81,6 +81,14 @@ static inline u64 max48(const u64 seq1, const u64 seq2)
return after48(seq1, seq2) ? seq1 : seq2;
}
+/* is seq1 next seqno after seq2 */
+static inline int follows48(const u64 seq1, const u64 seq2)
+{
+ int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);
+
+ return diff==1;
+}
+
enum {
DCCP_MIB_NUM = 0,
DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */