1 files changed, 9 insertions, 1 deletions

diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index d00a2f4ee5dd..a5c5475724c0 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 */