netdev - Re: [PATCH iproute2 0/3] do not set IPv6-only options on IPv4 addresses

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Date:   Mon, 24 Jun 2019 23:38:28 +0200
From:   Andrea Claudi <aclaudi@...hat.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, David Ahern <dsahern@...nel.org>
Subject: Re: [PATCH iproute2 0/3] do not set IPv6-only options on IPv4 addresses

On Mon, Jun 24, 2019 at 7:21 PM Stephen Hemminger
<stephen@...workplumber.org> wrote:
>
> On Mon, 24 Jun 2019 19:05:52 +0200
> Andrea Claudi <aclaudi@...hat.com> wrote:
>
> > 'home', 'nodad' and 'mngtmpaddr' options are IPv6-only, but
> > it is possible to set them on IPv4 addresses, too. This should
> > not be possible.
> >
> > Fix this adding a check on the protocol family before setting
> > the flags, and exiting with invarg() on error.
> >
> > Andrea Claudi (3):
> >   ip address: do not set nodad option for IPv4 addresses
> >   ip address: do not set home option for IPv4 addresses
> >   ip address: do not set mngtmpaddr option for IPv4 addresses
> >
> >  ip/ipaddress.c | 15 ++++++++++++---
> >  1 file changed, 12 insertions(+), 3 deletions(-)
> >
>
> Maybe this should be a warning, not a failure.
> A little concerned that there will be some user with a scripted setup
> that this breaks.

Hi Stephen,
I think that if a script wrongly uses some of these flags on a IPv4
address, it most probably operates on an unexpected address, since
everyone is aware that these flags are IPv6 only. In other words we
are breaking a scripted setup that is already broken.
In this case it's probably worth exiting with error and give the
author the chance to fix the script, otherwise the error can go
unnoticed.

If you prefer, I can send a v2 with warnings instead of errors, just
let me know.

Regards,
Andrea