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SubjectRe: [net-next PATCH v5 0/3] net: reserve ports for applications using fixed port numbers
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On Saturday 20 February 2010 10:11:40 you wrote:
> Octavian Purdila wrote:
> > This patch introduces /proc/sys/net/ipv4/ip_local_reserved_ports which
> > allows users to reserve ports for third-party applications.
> >
> > The reserved ports will not be used by automatic port assignments
> > (e.g. when calling connect() or bind() with port number 0). Explicit
> > port allocation behavior is unchanged.
> >
> > Changes from the previous version:
> > - switch the /proc entry format to coma separated list of range ports
> > - treat -EFAULT just like any other error and acknowledge written values
> > - use isdigit() in proc_get_ulong
> >
> > Octavian Purdila (3):
> > sysctl: refactor integer handling proc code
> > sysctl: add proc_do_large_bitmap
> > net: reserve ports for applications using fixed port numbers
>
> Hi,
>
> This version looks fine for me, but I need to give them a test, and
> I will put feedbacks asap. Thanks for your work!
>
> Still two things:
>
> 1) bitops are always atomic on every arch, right? If yes, then ok.

AFAIK, yes.

> 2) I hope you could add some documentation to show the relations
> between ip_local_port_range and ip_local_reserved_ports.
>

How does this sound:

ip_local_reserved_ports - list of comma separated ranges
Specify the ports which are reserved for known third-party
applications. These ports will not be used by automatic port
assignments (e.g. when calling connect() or bind() with port
number 0). Explicit port allocation behavior is unchanged.

The format used for both input and output is a comma separated
list of ranges (e.g. "1,2-4,10-10" for ports 1, 2, 3, 4 and
10). Writing to the file will clear all previously reserved
ports and update the current list with the one given in the
input.

Note that ip_local_port_range and ip_local_port_range settings
are independent and both are considered by the kernel when
determining which ports are available for automatic port
assignments.

You can reserve ports which are not in the current
ip_local_port_range, e.g.:

$ cat /proc/sys/net/ipv4/ip_local_port_range
32000 61000
$ cat /proc/sys/net/ipv4/ip_local_reserved_ports
8080,9148

although this is redundant. However such a setting is useful
if later the port range is changed to a value that will
include the reserved ports.





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