On 01/10/2012 01:04 PM, Eric Blake wrote:
On 12/09/2011 08:07 AM, Stefan Berger wrote:
-
+<p>
+<span class="since">Since 0.9.9</span> it is possible to access
We missed the release; s/0.9.9/0.9.10/
Fixed.
+ filtering rules that instantiate all combinations of rules from
+ different lists using the notation of
+<code>$VARIABLE[@<iterator ID>]</code>.
+ The following rule allows a virtual machine to
+ receive traffic on a set of ports, which are specified in DSTPORTS,
+ from the set of source IP address specified in SRCIPADDRESSES.
+ The rule generates all combinations of elements of the variable
+ DSTPORT with those of SRCIPADDRESSES.
I would also mention:
$VARIABLE is short-hand for $VARIABLE[@0]. When combining variables,
each variable that uses the same iterator ID will be directly combined;
it is the use of different iterator IDs that causes all combinations to
be generated.
And maybe even mention an example:
If variable A is the list [1, 2], and variable B is the list [3, 4],
then combining $A[@0] and $B[@0] produces the list [1/3, 2/4], while
combining $A[@0] and $B[@1] produces the list [1/3, 1/4, 2/3, 2/4].
Overall, I like what is in this series, but I think I had enough minor
findings that it would be worth posting a v2 before pushing anything.
I added a concrete example now and mention the $VARIABLE being
equivalent to $VARIABLE[@0].
Thanks.
Stefan
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