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 | 14 ++++++++++++++ 1 file changed, 14 insertions(+) create mode 100644 tests/py/inet/fib.t (limited to 'tests/py/inet/fib.t') diff --git a/tests/py/inet/fib.t b/tests/py/inet/fib.t new file mode 100644 index 00000000..9ee282ab --- /dev/null +++ b/tests/py/inet/fib.t @@ -0,0 +1,14 @@ +:prerouting;type filter hook prerouting priority 0 + +*ip;test-ip;prerouting +*ip6;test-ip6;prerouting + +fib saddr . daddr oif lo;fail +fib iif . oif . daddr oif lo;fail +fib mark oif lo;fail +fib saddr . iif oif ne 0;ok;fib saddr . iif oif != 0 +fib saddr . iif oifname "lo";ok + +fib daddr . iif type local;ok +fib daddr . iif type vmap { blackhole : drop, prohibit : drop, unicast : accept };ok +fib daddr . oif type local;fail -- cgit v1.2.3