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author | Florian Westphal <fw@strlen.de> | 2017-03-22 15:08:48 +0100 |
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committer | Florian Westphal <fw@strlen.de> | 2017-05-19 09:41:22 +0200 |
commit | 2366ed9ffcb4f5f5341f10f0a1d1a4688d37ad87 (patch) | |
tree | fb0e497da03ec9c3be4207ec93119b51bad6dc5f /src/numgen.c | |
parent | 9a1f2bbf3cd2417e0c10d18578e224abe2071d68 (diff) |
src: ipv6: switch implicit dependencies to meta l4proto
when using rule like
ip6 filter input tcp dport 22
nft generates:
[ payload load 1b @ network header + 6 => reg 1 ]
[ cmp eq reg 1 0x00000006 ]
[ payload load 2b @ transport header + 2 => reg 1 ]
[ cmp eq reg 1 0x00001600 ]
which is: ip6 filter input ip6 nexthdr tcp dport 22
IOW, such a rule won't match if e.g. a fragment header is in place.
This changes ip6_proto to use 'meta l4proto' which is the protocol header
found by exthdr walk.
A side effect is that for bridge we get a shorter dependency chain as it
no longer needs to prepend 'ether proto ipv6' for old 'ip6 nexthdr' dep.
Only problem:
ip6 nexthdr tcp tcp dport 22
will now inject a (useless) meta l4 dependency as ip6 nexthdr is no
longer flagged as EXPR_F_PROTOCOL, to avoid this add a small helper
that skips the unneded meta dependency in that case.
Signed-off-by: Florian Westphal <fw@strlen.de>
Diffstat (limited to 'src/numgen.c')
0 files changed, 0 insertions, 0 deletions