Re: [RFC Patch] net: reserve ports for applications using fixed portnumbers

[Cong Wang]

Octavian Purdila wrote:
> On Wednesday 03 February 2010 06:30:07 you wrote:
>
> > This patch introduces /proc/sys/net/ipv4/ip_local_reserved_ports,
> > it can be used like ip_local_port_range, but this is used to
> > reserve ports for third-party applications which use fixed
> > port numbers within ip_local_port_range.
> >
> > This only affects the applications which call socket functions
> > like bind(2) with port number 0, to prevent the kernel getting the ports
> > within the specified range for them. For applications which use fixed
> > port number, it will have no effects.
>
> It also affects the case where applications do connect, without previously 
> doing bind, right?


Yeah, I forgot to mention this, sorry.

> > Any comments are welcome.
>
> I think it might be useful to allow setting individual ports as reserved, not 
> only ranges, for example by using a bitmap. 

This is a good idea, but I am not sure if this will be overkill? :-/
Also, using bitmap is not friendly to sysctl interface, I am afraid.


Thanks!
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