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authorFlorian Westphal <fw@strlen.de>2016-09-15 17:28:00 +0200
committerFlorian Westphal <fw@strlen.de>2016-10-28 13:17:44 +0200
commit4a75ed32132d8e2292dd276f3ea7f4edec4f3d06 (patch)
tree1c095dc262a953ebb816d1770ccbdef1724e3e00 /src/scanner.l
parentdfd92948a0a88a9f245e71c1cfb63ae670e6e7c1 (diff)
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 <fw@strlen.de>
Diffstat (limited to 'src/scanner.l')
-rw-r--r--src/scanner.l2
1 files changed, 2 insertions, 0 deletions
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; }