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authorEric Dumazet <eric.dumazet@gmail.com>2011-10-22 01:25:23 -0400
committerDavid S. Miller <davem@davemloft.net>2011-10-22 01:25:23 -0400
commitb5d9c9c281395f0967c8d93f42e8b0b8175b5180 (patch)
tree81c6e038b5b11a60b3501508257dec516b92cc67
parentnet: use INET_ECN_MASK instead of hardcoded 3 (diff)
downloadlinux-dev-b5d9c9c281395f0967c8d93f42e8b0b8175b5180.tar.xz
linux-dev-b5d9c9c281395f0967c8d93f42e8b0b8175b5180.zip
inet: add rfc 3168 extract in front of INET_ECN_encapsulate()
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>
Diffstat (limited to '')
-rw-r--r--include/net/inet_ecn.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/net/inet_ecn.h b/include/net/inet_ecn.h
index 2fa8d1341a0a..2fa14691869c 100644
--- a/include/net/inet_ecn.h
+++ b/include/net/inet_ecn.h
@@ -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;