diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-08-26 18:00:00 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-08-29 20:30:29 +0200 |
| commit | 345236211715ffb7cc28f6ff0b26acb90181e738 (patch) | |
| tree | aebfc9aeece1dda1bb1ffab52aa93a9b1114f928 /tests/py/ip/hash.t | |
| parent | 13eeed6ea6f0a5d1353ee5ad14c4322695b4f59b (diff) | |
src: add hash expression
This is special expression that transforms an input expression into a
32-bit unsigned integer. This expression takes a modulus parameter to
scale the result and the random seed so the hash result becomes harder
to predict.
You can use it to set the packet mark, eg.
# nft add rule x y meta mark set jhash ip saddr . ip daddr mod 2 seed 0xdeadbeef
You can combine this with maps too, eg.
# nft add rule x y dnat to jhash ip saddr mod 2 seed 0xdeadbeef map { \
0 : 192.168.20.100, \
1 : 192.168.30.100 \
}
Currently, this expression implements the jenkins hash implementation
available in the Linux kernel:
http://lxr.free-electrons.com/source/include/linux/jhash.h
But it should be possible to extend it to support any other hash
function type.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'tests/py/ip/hash.t')
| -rw-r--r-- | tests/py/ip/hash.t | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/tests/py/ip/hash.t b/tests/py/ip/hash.t new file mode 100644 index 00000000..6dfa965b --- /dev/null +++ b/tests/py/ip/hash.t @@ -0,0 +1,5 @@ +:pre;type nat hook prerouting priority 0 +*ip;test-ip4;pre + +ct mark set jhash ip saddr . ip daddr mod 2 seed 0xdeadbeef;ok +dnat to jhash ip saddr mod 2 seed 0xdeadbeef map { 0 : 192.168.20.100, 1 : 192.168.30.100 };ok |