Re: [PATCH 2/3] x_tables: Use also dev->ifalias for interface matching

[Eric Dumazet]

On Mon, 2015-01-12 at 17:32 +0100, Jan Engelhardt wrote:
> On Monday 2015-01-12 17:04, Eric Dumazet wrote:
> >
> >iptables should have used ifindex [for interface matching],
> >it[']s sad we allowed the substring match in first place.
> 
> How would you solve interface name wildcards with ifindices?
> (They come in handy if you have something like lots of tun+/veth+
> interfaces from openvpn/lxc.)


This is what I said : "it[']s sad we allowed the substring match in
first place."

This obviously referred to wildcards, in the in/out interface match for
every _single_ rule, consuming 64 bytes of memory per rule and per cpu !
Which is absolutely crazy in term of memory usage.

Matching tun+ or whatever could easily be done by a match (-m ...),
because you can factorize this quite easily (called once for a group of
rules)



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