diff options
author | Florian Westphal <fw@strlen.de> | 2016-09-15 17:28:00 +0200 |
---|---|---|
committer | Florian Westphal <fw@strlen.de> | 2016-10-28 13:17:44 +0200 |
commit | 4a75ed32132d8e2292dd276f3ea7f4edec4f3d06 (patch) | |
tree | 1c095dc262a953ebb816d1770ccbdef1724e3e00 /include/fib.h | |
parent | dfd92948a0a88a9f245e71c1cfb63ae670e6e7c1 (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 'include/fib.h')
-rw-r--r-- | include/fib.h | 7 |
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 @@ +#ifndef NFTABLES_FIB_H +#define NFTABLES_FIB_H + +extern struct expr *fib_expr_alloc(const struct location *loc, + unsigned int flags, + unsigned int result); +#endif /* NFTABLES_FIB_H */ |