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

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Date:   Tue, 2 Jul 2019 13:19:47 +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 12:55 PM Andrea Claudi <aclaudi@...hat.com> wrote:
>
> 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

Jianwen, can you please check if this patch solves your issue?

--- a/ip/ip6tunnel.c
+++ b/ip/ip6tunnel.c
@@ -298,7 +298,7 @@ static int parse_args(int argc, char **argv, int
cmd, struct ip6_tnl_parm2 *p)
                p->link = ll_name_to_index(medium);
                if (!p->link)
                        return nodev(medium);
-               else
+               else if (cmd != SIOCADDTUNNEL)
                        strlcpy(p->name, medium, sizeof(p->name));
        }
        return 0;

Thanks in advance!