On Tue, Mar 01, 2016 at 09:40:45PM +0100, Laura Garcia Liebana wrote:
> Add translation for random mode to nftables. The nth mode is not
> supported yet.
>
> Examples:
>
> $ iptables-translate -A INPUT -m statistic --mode random --probability
> 0.1 -j ACCEPT
> nft add rule ip filter INPUT meta random 0.10000000009 counter accept
Is this translation correct?
I can see in
static bool
statistic_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_statistic_info *info = par->matchinfo;
bool ret = info->flags & XT_STATISTIC_INVERT;
int nval, oval;
switch (info->mode) {
case XT_STATISTIC_MODE_RANDOM:
if ((prandom_u32() & 0x7FFFFFFF) < info->u.random.probability)
--probability seems to check for "less than" the random value.
I think meta random 0.10000000009 will only match for the exact case.
So I suspect this is:
meta random lt 0.10000000009
> $ iptables-translate -A INPUT -m statistic --mode random ! --probability
> 0.1 -j ACCEPT
> nft add rule ip filter INPUT meta random != 0.10000000009 counter accept
Then, the opposite has to be:
meta random gte 0.10000000009
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