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inet: add rfc 3168 extract in front of INET_ECN_encapsulate()

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INET_ECN_encapsulate() is better understood if we can read the official
statement.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-10-22 01:25:23 -04:00 committed by David S. Miller
parent 2c67e9acb6
commit b5d9c9c281
1 changed files with 8 additions and 0 deletions
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8
include/net/inet_ecn.h
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@ -30,6 +30,14 @@ static inline int INET_ECN_is_capable(__u8 dsfield)
return dsfield & INET_ECN_ECT_0;
}
/*
* RFC 3168 9.1.1
* The full-functionality option for ECN encapsulation is to copy the
* ECN codepoint of the inside header to the outside header on
* encapsulation if the inside header is not-ECT or ECT, and to set the
* ECN codepoint of the outside header to ECT(0) if the ECN codepoint of
* the inside header is CE.
*/
static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner)
{
outer &= ~INET_ECN_MASK;