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/proto.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/proto.h')
-rw-r--r-- | include/proto.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/proto.h b/include/proto.h index 2a662a1a..14af9653 100644 --- a/include/proto.h +++ b/include/proto.h @@ -183,7 +183,7 @@ enum ip_hdr_fields { IPHDR_INVALID, IPHDR_VERSION, IPHDR_HDRLENGTH, - IPHDR_TOS, + IPHDR_DSCP, IPHDR_LENGTH, IPHDR_ID, IPHDR_FRAG_OFF, @@ -220,7 +220,7 @@ enum icmp6_hdr_fields { enum ip6_hdr_fields { IP6HDR_INVALID, IP6HDR_VERSION, - IP6HDR_PRIORITY, + IP6HDR_DSCP, IP6HDR_FLOWLABEL, IP6HDR_LENGTH, IP6HDR_NEXTHDR, |