On Wed, 3 Jan 2024, Mark Johnston wrote:
The branch main has been updated by markj:
URL:
https://cgit.FreeBSD.org/src/commit/?id=b0e13f785b336670bdf39b83a78435b00d00f43c
commit b0e13f785b336670bdf39b83a78435b00d00f43c
Author: Jose Luis Duran <jldu...@gmail.com>
AuthorDate: 2023-10-28 02:50:18 +0000
Commit: Mark Johnston <ma...@freebsd.org>
CommitDate: 2024-01-03 17:56:28 +0000
netinet: Define IPv6 ECN mask
Define a mask for the code point used for ECN in the Traffic Class field
(2 bits) of an IPv6 header.
BE: 0 0 3 0 0 0 0 0
Bit: 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Version| Traffic Class | Flow Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
For BE (Big Endian), or network-byte order, this corresponds to 0x00300000.
For Little Endian, it corresponds to 0x00003000.
I would really appreciate if these (supposedly excepts) came with a
reference to an RFC (ideally with section).
Reviewed by: imp, markj
MFC after: 1 week
Pull Request: https://github.com/freebsd/freebsd-src/pull/879
---
sys/netinet/ip6.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/sys/netinet/ip6.h b/sys/netinet/ip6.h
index 9807e6a1780a..2f61d594e59d 100644
--- a/sys/netinet/ip6.h
+++ b/sys/netinet/ip6.h
@@ -95,10 +95,12 @@ struct ip6_hdr {
#if BYTE_ORDER == BIG_ENDIAN
#define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
+#define IPV6_ECN_MASK 0x00300000 /* ECN code point (2 bits) */
#else
#if BYTE_ORDER == LITTLE_ENDIAN
#define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
+#define IPV6_ECN_MASK 0x00003000 /* ECN code point (2 bits) */
#endif /* LITTLE_ENDIAN */
#endif
#define IPV6_FLOWLABEL_LEN 20
--
Bjoern A. Zeeb r15:7
