From 837d107cd101fbf734e9ea2bbb5c7336a329e432 Mon Sep 17 00:00:00 2001
From: Ian McDonald <ian.mcdonald@jandi.co.nz>
Date: Sat, 26 Aug 2006 19:06:42 -0700
Subject: [DCCP]: Introduces follows48 function

This adds a new function to see if two sequence numbers follow each
other.

Signed off by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/dccp/dccp.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'net/dccp')

diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index b8931d33bec3..a5c5475724c0 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -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 */
-- 
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