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netinet: Define IPv6 ECN mask

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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.

Reviewed by:	imp, markj
MFC after:	1 week
Pull Request:	https://github.com/freebsd/freebsd-src/pull/879

(cherry picked from commit b0e13f785b)
This commit is contained in:
Jose Luis Duran 2023-10-28 02:50:18 +00:00 committed by Mark Johnston
parent 8ac8b0b6aa
commit d14bf9de60
1 changed files with 2 additions and 0 deletions
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2
sys/netinet/ip6.h
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@ -97,10 +97,12 @@ 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