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Re: [libvirt] [libvirt PATCHv3 05/10] allow chain modification

On 10/17/2011 01:23 PM, David Stevens wrote:
Stefan Berger<stefanb linux vnet ibm com>  wrote on 10/17/2011 09:07:12

On 10/12/2011 03:50 PM, David L Stevens wrote:
    This patch adds the internal capability to add rules to existing
chains instead of using temporary chains and to generate placeholders
chains that are referenced without generating a rule for them
Finally, it includes variable matching for filter instantiation
(i.e., instantiate only when a given variable is present in a filter,
only when it is not).

Following the above I am not sure what this will be used for as part of
this extension.
         This is used to add rules to existing chains when a new IP address
discovered (i.e., a DHCP ACK from a server occurs). The existing code
the entire chain as a temporary chain and then swaps it in, which is only
appropriate at start-up. For DHCP snooping, we want to add and remove
that reference "IP" using a particular value (the address for the ACK or
lease expiration) without affecting other rules that don't reference IP or
have a different address value. "removeRules" was already there, but
was not.
Yes, then I understood this correctly. See the other mails regarding the problems I am seeing with it. If there was a way to figure out at what position to insert a rule into an existing chain, i.e. at position 5, rather than always at the end, we could use this addRules() call, otherwise I find it very limiting.



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