Subject: Re: iproute2 regression -- ss -u returns an empty list

From: Vadim Kochan <[email-masked]>
Date: Tue, 28 Apr 2015 08:11:18 +0300

On Tue, Apr 28, 2015 at 07:07:56AM +0200, Mihai Moldovan wrote:
> On 28.04.2015 06:47 AM, Vadim Kochan wrote:
> > On Tue, Apr 28, 2015 at 06:33:18AM +0200, Mihai Moldovan wrote:
> >> On 28.04.2015 06:05 AM, Vadim Kochan wrote:> So by default ss prints
> >> socket with CONNECTED state and even UDP can be
> >>> in the CONNECTED state on the Linux,
> >> 
> >> UDP can be in a CONNECTED state... ooookay. That's probably a conntrack 
> >> thing.
> >> 
> >> 
> >>> so you can specify 'ss -ua' (may be some explanation should be added to 
> >>> the ss man page) which should print UDP sockets in the any state, AFAIK 
> >>> it was the default behaviour before my changes.
> >> 
> >> Could this please be reverted? It's breaking other stuff that uses ss.
> >> 
> >> Also: ss -lxua returns an empty list, too. Previously, the families seem
> >> to have been OR'd, while they are now ANDed?
> >> 
> >> 
> >> 
> >> Mihai
> >> 
> > 
> > I will try to fix this ...
> 
> Thanks!
> 
> To be a bit more verbose about the rationale:
> 
> Changing the default behavior is generally a bad idea, unless strictly necessary
> (e.g., if the previous default behavior was buggy anyway), because it may break

Yes the previous behaviour was buggy ... And that was the reason.

> other software. Please try introducing behavioral changes via new options.
> 
> That way, dependencies will still work fine and anyone who wants to use the new
> behavior can explicitly do so via a switch.
> 
> I could work around this by checking ss' version, but that turns out to be a
> pain, too, because ss -V reports something like this:
> 
> "ss utility, iproute2-ss150413"
> 
> Not exactly a "friendly" version like "3.19.0" or "4.0.0" to check against...
> 
> 
> 
> Mihai
> 
>