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[DCCP]: Introduces follows48 function

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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>
This commit is contained in:
Ian McDonald 2006-08-26 19:06:42 -07:00 • committed by David S. Miller
parent e6bccd3573
commit 837d107cd1
1 changed files with 8 additions and 0 deletions

8
net/dccp/dccp.h
View file

@ -81,6 +81,14 @@ static inline u64 max48(const u64 seq1, const u64 seq2)
return after48(seq1, seq2) ? seq1 : 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 { enum {
DCCP_MIB_NUM = 0, DCCP_MIB_NUM = 0,
DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */