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 --- src/scanner.l | 2 ++ 1 file changed, 2 insertions(+) (limited to 'src/scanner.l') diff --git a/src/scanner.l b/src/scanner.l index c8352014..9cb8d778 100644 --- a/src/scanner.l +++ b/src/scanner.l @@ -465,6 +465,8 @@ addrstring ({macaddr}|{ip4addr}|{ip6addr}) "dup" { return DUP; } "fwd" { return FWD; } +"fib" { return FIB; } + "xml" { return XML; } "json" { return JSON; } -- cgit v1.2.3