From e20eac092725c982387181f3df557877b02eb345 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Fri, 15 Apr 2016 15:09:39 +0200 Subject: payload: only merge if adjacent and combined size fits into a register 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 Acked-by: Arturo Borrero Gonzalez Acked-by: Pablo Neira Ayuso --- tests/py/ip6/ip6.t | 1 + 1 file changed, 1 insertion(+) (limited to 'tests/py/ip6/ip6.t') diff --git a/tests/py/ip6/ip6.t b/tests/py/ip6/ip6.t index 96366721..2a1eee78 100644 --- a/tests/py/ip6/ip6.t +++ b/tests/py/ip6/ip6.t @@ -139,6 +139,7 @@ ip6 saddr 1234::;ok # v61 ({v610}|{v611}) # v60 (::) ip6 saddr ::/64;ok +ip6 saddr ::1 ip6 daddr ::2;ok - ip6 daddr != {::1234:1234:1234:1234:1234:1234:1234, 1234:1234::1234:1234:1234:1234:1234 };ok ip6 daddr != ::1234:1234:1234:1234:1234:1234:1234-1234:1234::1234:1234:1234:1234:1234;ok;ip6 daddr != 0:1234:1234:1234:1234:1234:1234:1234-1234:1234:0:1234:1234:1234:1234:1234 -- cgit v1.2.3