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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>
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This is a 20 bit field according to Section 3. IPv6 Header Format.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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add rule ip6 filter input ip6 saddr ::1/128 ip6 daddr ::1/128 fails,
we ask to compare a 32byte immediate which is not supported:
[ payload load 32b @ network header + 8 => reg 1 ]
[ cmp eq reg 1 0x00000000 0x00000000 0x00000000 0x01000000 0x00000000 0x00000000 0x00000000 0x02000000 ]
We would need to use two cmps in this case, i.e.:
[ payload load 32b @ network header + 8 => reg 1 ]
[ cmp eq reg 1 0x00000000 0x00000000 0x00000000 0x01000000 ]
[ cmp eq reg 2 0x00000000 0x00000000 0x00000000 0x02000000 ]
Seems however that this requires a bit more changes to how nft
handles register allocations, we'd also need to undo the constant merge.
Lets disable merging for now so that we generate
[ payload load 16b @ network header + 8 => reg 1 ]
[ cmp eq reg 1 0x00000000 0x00000000 0x00000000 0x01000000 ]
[ payload load 16b @ network header + 24 => reg 1 ]
[ cmp eq reg 1 0x00000000 0x00000000 0x00000000 0x02000000 ]
... if merge would bring us over the 128 bit register size.
Closes: http://bugzilla.netfilter.org/show_bug.cgi?id=1032
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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I think this unit tests should be self-contained at some level. The
shell/ directory should be used to catch regressions at ruleset level,
ie. these kind of combinations.
Another motivation is that I want that netdev/ingress gets tested
(coming in a follow up patch), and we don't support log there yet, so I
would need to skip this test for that case.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Rearrange the directory to obtain a better organization of files and
tests-suites.
We end with a tree like this:
tests
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.--- py
.--- shell
.--- files
This was suggested by Pablo.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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