Ubuntu
network-manager package

dnsmasq not using all DHCPv6 provided nameservers

Bug #1327477 reported by Kevin Otte on 2014-06-07

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	dnsmasq (Ubuntu)	Fix Released	Undecided	Carlos Hsiao
	network-manager (Ubuntu)	Invalid	Undecided	Carlos Hsiao

Bug Description

When receiving nameservers from a DHCPv6 server, NetworkManager reports receiving both my primary and secondary servers, but only advises dnsmasq about the secondary.

Jun 6 13:59:29 daedalus dhclient: XMT: Info-Request on eth0, interval 910ms.
Jun 6 13:59:29 daedalus dhclient: RCV: Reply message on eth0 from fe80::221:85ff:fe10:7749.
Jun 6 13:59:29 daedalus NetworkManager[22306]: <info> (eth0): DHCPv6 state changed nbi -> renew6
Jun 6 13:59:29 daedalus NetworkManager[22306]: <info> nameserver '2001:470:8:64f::4'
Jun 6 13:59:29 daedalus NetworkManager[22306]: <info> nameserver '2001:470:8:64f:21b:fcff:fe43:bcff'
Jun 6 13:59:29 daedalus NetworkManager[22306]: <info> domain search 'home.nivex.net.'
Jun 6 13:59:29 daedalus NetworkManager[22306]: <info> Activation (eth0) Stage 5 of 5 (IPv6 Commit) scheduled...
Jun 6 13:59:29 daedalus NetworkManager[22306]: <info> (eth0): DHCPv6 client pid 22638 exited with status 0
Jun 6 13:59:29 daedalus NetworkManager[22306]: <info> Activation (eth0) Stage 5 of 5 (IPv6 Commit) started...
Jun 6 13:59:29 daedalus avahi-daemon[991]: Registering new address record for 2001:470:8:64f:dcf5:dd0f:11f5:b6ed on eth0.*.
Jun 6 13:59:30 daedalus NetworkManager[22306]: <info> (eth0): device state change: ip-config -> secondaries (reason 'none') [70 90 0]
Jun 6 13:59:30 daedalus NetworkManager[22306]: <info> Activation (eth0) Stage 5 of 5 (IPv6 Commit) complete.
Jun 6 13:59:30 daedalus NetworkManager[22306]: <info> (eth0): device state change: secondaries -> activated (reason 'none') [90 100 0]
Jun 6 13:59:30 daedalus NetworkManager[22306]: <info> NetworkManager state is now CONNECTED_GLOBAL
Jun 6 13:59:30 daedalus NetworkManager[22306]: <info> Policy set 'Ethernet connection 1' (eth0) as default for IPv6 routing and DNS.
Jun 6 13:59:30 daedalus NetworkManager[22306]: <info> Writing DNS information to /sbin/resolvconf
Jun 6 13:59:30 daedalus dnsmasq[22603]: setting upstream servers from DBus
Jun 6 13:59:30 daedalus dnsmasq[22603]: using nameserver 2001:470:8:64f:21b:fcff:fe43:bcff#53
Jun 6 13:59:30 daedalus NetworkManager[22306]: <info> Activation (eth0) successful, device activated.

I noticed this during the Turn IPv4 Off Day (http://www.internetsociety.org/deploy360/blog/2013/12/campaign-turn-off-ipv4-on-6-june-2014-for-one-day/) shakedown because my secondary was not configured to recurse over IPv6, resulting in an inability to resolve anything.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: network-manager 0.9.8.8-0ubuntu7
ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
Uname: Linux 3.13.0-27-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Jun 6 23:18:49 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2011-12-09 (910 days ago)
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
IpRoute:
default via 172.31.3.1 dev eth0 proto static
172.31.3.0/24 dev eth0 proto kernel scope link src 172.31.3.11 metric 1
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: yes
SourcePackage: network-manager
UpgradeStatus: Upgraded to trusty on 2014-04-20 (47 days ago)
nmcli-dev:
DEVICE TYPE STATE DBUS-PATH
wlan0 802-11-wireless unavailable /org/freedesktop/NetworkManager/Devices/1
eth0 802-3-ethernet connected /org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
running 0.9.8.8 connected enabled disabled disabled enabled disabled

Tags:

Revision history for this message

Kevin Otte (nivex) wrote on 2014-06-07:

CRDA.txt Edit (257 bytes, text/plain; charset="utf-8")
Dependencies.txt Edit (8.5 KiB, text/plain; charset="utf-8")
IfupdownConfig.txt Edit (839 bytes, text/plain; charset="utf-8")
IpAddr.txt Edit (1.3 KiB, text/plain; charset="utf-8")
IwConfig.txt Edit (324 bytes, text/plain; charset="utf-8")
NetDevice.eth0.txt Edit (589 bytes, text/plain; charset="utf-8")
NetDevice.lo.txt Edit (142 bytes, text/plain; charset="utf-8")
NetDevice.ovs-system.txt Edit (166 bytes, text/plain; charset="utf-8")
NetDevice.ovsbr0.txt Edit (154 bytes, text/plain; charset="utf-8")
NetDevice.wlan0.txt Edit (613 bytes, text/plain; charset="utf-8")
NetworkManager.conf.txt Edit (75 bytes, text/plain; charset="utf-8")
PciNetwork.txt Edit (1.2 KiB, text/plain; charset="utf-8")
ProcEnviron.txt Edit (106 bytes, text/plain; charset="utf-8")
WifiSyslog.txt Edit (7.9 KiB, text/plain; charset="utf-8")
nmcli-con.txt Edit (6.4 KiB, text/plain; charset="utf-8")

Carlos Hsiao (weii666) on 2014-06-08

Changed in network-manager (Ubuntu):
assignee:	nobody → Carlos Hsiao (weii666)

Carlos Hsiao (weii666) on 2014-06-08

Changed in network-manager (Ubuntu):
status:	New → Invalid
Changed in dnsmasq (Ubuntu):
status:	New → Confirmed
assignee:	nobody → Carlos Hsiao (weii666)

Revision history for this message

Carlos Hsiao (weii666) wrote on 2014-06-08:

dnsmasq-2.68-fix-ipv6-ns.patch Edit (1.0 KiB, text/plain)

On 14.04, Netowrk-Manager is fine. The problem is at dnsmasq receiving ipv6 nameservers from dbus.
Here is the proposed fix in parsing ipv6 address length.

Revision history for this message

Ubuntu Foundations Team Bug Bot (crichton) wrote on 2014-06-08:

The attachment "dnsmasq-2.68-fix-ipv6-ns.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

tags:

added: patch

Revision history for this message

Simon Kelley (simon-thekelleys) wrote on 2014-06-08:

I think the following, much simpler, patch should solve the problem.

Simon.

diff --git a/src/dbus.c b/src/dbus.c
index 93c597c..4696442 100644
--- a/src/dbus.c
+++ b/src/dbus.c
@@ -156,13 +156,16 @@ static void dbus_read_servers(DBusMessage *message)
              dbus_message_iter_get_basic(&iter, &p[i]);
              dbus_message_iter_next (&iter);
              if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BYTE)
- break;
+ {
+ i++;
+ break;
+ }
            }

#ifndef HAVE_IPV6
          my_syslog(LOG_WARNING, _("attempt to set an IPv6 server address via DBus - no IPv6 support"));
#else
- if (i == sizeof(struct in6_addr)-1)
+ if (i == sizeof(struct in6_addr))
            {
              memcpy(&addr.in6.sin6_addr, p, sizeof(struct in6_addr));
#ifdef HAVE_SOCKADDR_SA_LEN