From 4a75ed32132d8e2292dd276f3ea7f4edec4f3d06 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Thu, 15 Sep 2016 17:28:00 +0200 Subject: src: add fib expression This adds the 'fib' expression which can be used to obtain the output interface from the route table based on either source or destination address of a packet. This can be used to e.g. add reverse path filtering: # drop if not coming from the same interface packet # arrived on # nft add rule x prerouting fib saddr . iif oif eq 0 drop # accept only if from eth0 # nft add rule x prerouting fib saddr . iif oif eq "eth0" accept # accept if from any valid interface # nft add rule x prerouting fib saddr oif accept Querying of address type is also supported. This can be used to e.g. only accept packets to addresses configured in the same interface: # fib daddr . iif type local Its also possible to use mark and verdict map, e.g.: # nft add rule x prerouting meta mark set 0xdead fib daddr . mark type vmap { blackhole : drop, prohibit : drop, unicast : accept } Signed-off-by: Florian Westphal --- tests/py/inet/fib.t.payload | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 tests/py/inet/fib.t.payload (limited to 'tests/py/inet/fib.t.payload') diff --git a/tests/py/inet/fib.t.payload b/tests/py/inet/fib.t.payload new file mode 100644 index 00000000..f5258165 --- /dev/null +++ b/tests/py/inet/fib.t.payload @@ -0,0 +1,22 @@ +# fib saddr . iif oif ne 0 +ip test-ip prerouting + [ fib saddr . iif oif => reg 1 ] + [ cmp neq reg 1 0x00000000 ] + +# fib saddr . iif oifname "lo" +ip test-ip prerouting + [ fib saddr . iif oifname => reg 1 ] + [ cmp eq reg 1 0x00006f6c 0x00000000 0x00000000 0x00000000 ] + +# fib daddr . iif type local +ip test-ip prerouting + [ fib daddr . iif type => reg 1 ] + [ cmp eq reg 1 0x00000002 ] + +# fib daddr . iif type vmap { blackhole : drop, prohibit : drop, unicast : accept } +__map%d test-ip b +__map%d test-ip 0 + element 00000006 : 0 [end] element 00000008 : 0 [end] element 00000001 : 0 [end] +ip test-ip prerouting + [ fib daddr . iif type => reg 1 ] + [ lookup reg 1 set __map%d dreg 0 ] -- cgit v1.2.3