linux-kernel - RE: [PATCH] tools: hv: kvp_daemon: make IPv6-only-injection work

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Date:	Wed, 10 Dec 2014 10:02:51 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH] tools: hv: kvp_daemon: make IPv6-only-injection work

> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets@...hat.com]
> Sent: Wednesday, December 10, 2014 17:08 PM
> To: Dexuan Cui
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org; driverdev-
> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> jasowang@...hat.com; KY Srinivasan; Haiyang Zhang
> Subject: Re: [PATCH] tools: hv: kvp_daemon: make IPv6-only-injection work
> 
> Dexuan Cui <decui@...rosoft.com> writes:
> 
> > Thanks,
> > -- Dexuan
> >
> >> -----Original Message-----
> >> From: Dexuan Cui
> >> Sent: Wednesday, December 10, 2014 15:34 PM
> >> To: 'Vitaly Kuznetsov'
> >> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org; driverdev-
> >> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> >> jasowang@...hat.com; KY Srinivasan; Haiyang Zhang
> >> Subject: RE: [PATCH] tools: hv: kvp_daemon: make IPv6-only-injection
> work
> >>
> >> > -----Original Message-----
> >> > From: Vitaly Kuznetsov [mailto:vkuznets@...hat.com]
> >> > Sent: Tuesday, December 9, 2014 21:06 PM
> >> > To: Dexuan Cui
> >> > Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> driverdev-
> >> > devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> >> > jasowang@...hat.com; KY Srinivasan; Haiyang Zhang
> >> > Subject: Re: [PATCH] tools: hv: kvp_daemon: make IPv6-only-injection
> work
> >> >  ......
> >> > > +	 * Here "dhcp_enabled" is only for IPv4 according to Hyper-V host
> >> > team.
> >> > > +	 *
> >> > > +	 * In the case the host only injects 1 IPv6 address:
> >> > > +	 * new_val->dhcp_enabled is true, but we can't pass
> >> > BOOTPROTO=dhcp to
> >> > > +	 * the script hv_set_ifconfig, because in some distros (like RHEL7)
> >> > > +	 * BOOTPROTO=dhcp has a special meaning in the config file (e.g.,
> >> > > +	 * /etc/sysconfig/network-scripts/ifcfg-eth0): the network init
> >> > program
> >> > > +	 * ignores any static IP addr information once there is
> >> > > +	 * BOOTPROTO=dhcp; as a result, IPv6-only injection can't work.
> >> > > +	 *
> >> > > +	 * In the case of IPv6-only injection, BOOTPROTO=dhcp doesn't affect
> >> > > +	 * Ubuntu because it's ignored by the Ubuntu version of
> >> > > +	 * hv_set_ifconfig and it doesn't seem to have special meaning in
> >> > > +	 * Ubuntu.
> >> > > +	 */
> >> >
> >> > I just checked and adding "IPV6ADDR=something" when
> >> "BOOTPROTO=dhcp"
> >> > works for me with both RHEL7 and Fedora21.
> >> It doesn't work in my side. :-(
> >> Running 'ifup eth0' shows some errors(I use "set -x")
> >> ...
> >> + /sbin/dhclient -H localhost -1 -q -lf /var/lib/dhclient/dhclient--eth0.lease
> -pf
> >> /var/run/dhclient-eth0.pid eth0
> >> grep: /etc/sysconfig/network-scripts/ifcfg-eth0: Permission dinied.
> > BTW, I run with root, and
> > 'chown 777 /etc/sysconfig/network-scripts/ifcfg-eth0" doesn't help.
> >
> 
> s,chown,chmod, :-) But it won't help in case of SELinux mislabeling.
> 
> > Thanks,
> > -- Dexuan
> 
> --
>   Vitaly

Hi Vitally,
I think you're correct:
BOOTPROTO=dhcp + "no IPADDR" +  IPV6ADDR in RHEL7's 
/etc/sysconfig/network-scripts/ifcfg-eth0 works for me too.

My previous "grep: ... ifcfg-eth0: Permission denied" issue can't repro now.
Maybe it's because I messed up the config file somehow(?).

I'll send out a v2 patch according to your suggestion.

Thanks,
-- Dexuan 
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