[DCCP]: Introduces follows48 function
authorIan McDonald <ian.mcdonald@jandi.co.nz>
Sun, 27 Aug 2006 02:06:42 +0000 (19:06 -0700)
committerDavid S. Miller <davem@davemloft.net>
Sun, 27 Aug 2006 02:06:42 +0000 (19:06 -0700)
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

index b8931d33bec3c5d1f25d1b6ac806349d842b09b7..a5c5475724c0bf56f97348dcd40d2b5ebeed912e 100644 (file)
@@ -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 */