diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-05-11 00:21:24 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-05-11 23:01:31 +0200 |
| commit | 16fcc85c283537ea00357e2ca4bbb561c03bc65b (patch) | |
| tree | 8ab5e756ee08dca26a10c3977679e5423e786d56 /include/datatype.h | |
| parent | 7fbbeb1f0db7718fbfedea4e50f69a54d1bfda70 (diff) | |
src: add dscp support
This supports both IPv4:
# nft --debug=netlink add rule filter forward ip dscp cs1 counter
ip filter forward
[ payload load 1b @ network header + 1 => reg 1 ]
[ bitwise reg 1 = (reg=1 & 0x000000fc ) ^ 0x00000000 ]
[ cmp neq reg 1 0x00000080 ]
[ counter pkts 0 bytes 0 ]
And also IPv6, note that in this case we take two bytes from the payload:
# nft --debug=netlink add rule ip6 filter input ip6 dscp cs4 counter
ip6 filter input
[ payload load 2b @ network header + 0 => reg 1 ]
[ bitwise reg 1 = (reg=1 & 0x0000c00f ) ^ 0x00000000 ]
[ cmp eq reg 1 0x00000008 ]
[ counter pkts 0 bytes 0 ]
Given the DSCP is split in two bytes, the less significant nibble
of the first byte and the two most significant 2 bits of the second
byte.
The 8 bit traffic class in RFC2460 after the version field are used for
DSCP (6 bit) and ECN (2 bit). Support for ECN comes in a follow up
patch.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include/datatype.h')
| -rw-r--r-- | include/datatype.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/datatype.h b/include/datatype.h index 91ca2dd1..e385bac1 100644 --- a/include/datatype.h +++ b/include/datatype.h @@ -40,6 +40,7 @@ * @TYPE_ICMPV6_CODE: icmpv6 code (integer subtype) * @TYPE_ICMPX_CODE: icmpx code (integer subtype) * @TYPE_DEVGROUP: devgroup code (integer subtype) + * @TYPE_DSCP: Differentiated Services Code Point (integer subtype) */ enum datatypes { TYPE_INVALID, @@ -78,6 +79,7 @@ enum datatypes { TYPE_ICMPV6_CODE, TYPE_ICMPX_CODE, TYPE_DEVGROUP, + TYPE_DSCP, __TYPE_MAX }; #define TYPE_MAX (__TYPE_MAX - 1) |