path: root/src/evaluate.c
diff options
authorFlorian Westphal <>2016-09-15 17:28:00 +0200
committerFlorian Westphal <>2016-10-28 13:17:44 +0200
commit4a75ed32132d8e2292dd276f3ea7f4edec4f3d06 (patch)
tree1c095dc262a953ebb816d1770ccbdef1724e3e00 /src/evaluate.c
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 <>
Diffstat (limited to 'src/evaluate.c')
1 files changed, 1 insertions, 0 deletions
diff --git a/src/evaluate.c b/src/evaluate.c
index ab0dd9ef..a2e5dbb9 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -1638,6 +1638,7 @@ static int expr_evaluate(struct eval_ctx *ctx, struct expr **expr)
return expr_evaluate_exthdr(ctx, expr);
+ case EXPR_FIB:
return expr_evaluate_primary(ctx, expr);
return expr_evaluate_payload(ctx, expr);