path: root/include/fib.h
diff options
authorFlorian Westphal <>2016-09-15 17:28:00 +0200
committerFlorian Westphal <>2016-10-28 13:17:44 +0200
commit4a75ed32132d8e2292dd276f3ea7f4edec4f3d06 (patch)
tree1c095dc262a953ebb816d1770ccbdef1724e3e00 /include/fib.h
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 'include/fib.h')
1 files changed, 7 insertions, 0 deletions
diff --git a/include/fib.h b/include/fib.h
new file mode 100644
index 00000000..3a019e65
--- /dev/null
+++ b/include/fib.h
@@ -0,0 +1,7 @@
+extern struct expr *fib_expr_alloc(const struct location *loc,
+ unsigned int flags,
+ unsigned int result);
+#endif /* NFTABLES_FIB_H */