netdev - Re: [iproute2] Can't create ip6 tunnel device

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Date:   Tue, 2 Jul 2019 12:55:38 +0200
From:   Andrea Claudi <aclaudi@...hat.com>
To:     Ji Jianwen <jijianwen@...il.com>
Cc:     netdev@...r.kernel.org,
        Stephen Hemminger <stephen@...workplumber.org>,
        maheshb@...gle.com
Subject: Re: [iproute2] Can't create ip6 tunnel device

On Tue, Jul 2, 2019 at 12:27 PM Ji Jianwen <jijianwen@...il.com> wrote:
>
> It seems this issue was introduced by commit below, I am able to run
> the command successfully mentioned at previous mail without it.
>
> commit ba126dcad20e6d0e472586541d78bdd1ac4f1123 (HEAD)
> Author: Mahesh Bandewar <maheshb@...gle.com>
> Date:   Thu Jun 6 16:44:26 2019 -0700
>
>     ip6tunnel: fix 'ip -6 {show|change} dev <name>' cmds
>

>From what I can see, before this commit we have in p->name the tunnel
iface name (in Jianwen example, ip6tnl1), while after this p->name
contains the iface name specified after "dev".
Probably the strlcpy() should be limited to the {show|change} cases?

Regards,
Andrea

> On Tue, Jul 2, 2019 at 2:53 PM Ji Jianwen <jijianwen@...il.com> wrote:
> >
> > Hello  there,
> >
> > I got error when creating ip6 tunnel device on a rhel-8.0.0 system.
> >
> > Here are the steps to reproduce the issue.
> > # # uname -r
> > 4.18.0-80.el8.x86_64
> > # dnf install -y libcap-devel bison flex git gcc
> > # git clone git://git.kernel.org/pub/scm/network/iproute2/iproute2.git
> > # cd iproute2  &&  git log --pretty=oneline --abbrev-commit
> > d0272f54 (HEAD -> master, origin/master, origin/HEAD) devlink: fix
> > libc and kernel headers collision
> > ee09370a devlink: fix format string warning for 32bit targets
> > 68c46872 ip address: do not set mngtmpaddr option for IPv4 addresses
> > e4448b6c ip address: do not set home option for IPv4 addresses
> > ....
> >
> > # ./configure && make && make install
> > # ip -6 tunnel add ip6tnl1 mode ip6ip6 remote 2001:db8:ffff:100::2
> > local 2001:db8:ffff:100::1 hoplimit 1 tclass 0x0 dev eno1   --->
> > please replace eno1 with the network card name of your system
> > add tunnel "ip6tnl0" failed: File exists
> >
> > Please help take a look. Thanks!
> >
> > Br,
> > Jianwen