[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.2.0-111.153

---
linux (3.2.0-111.153) precise; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
- LP: #1626151

  * Altering use_tempaddr drops all IPv6 addresses (LP: #994931)
- Revert "UBUNTU: SAUCE: ipv6: make the net.ipv6.conf.all.use_tempaddr 
sysctl
  propagate to interface settings"
- neigh: new unresolved queue limits
- neigh: Add device constructor/destructor capability.
- atm: clip: Use device neigh support on top of "arp_tbl".
- atm: clip: remove clip_tbl
- neigh: convert parms to an array
- neigh: wrap proc dointvec functions
- neigh: use tbl->family to distinguish ipv4 from ipv6
- neigh: restore old behaviour of default parms values
- neigh: ipv6: respect default values set before an address is assigned to
  device

  * Xen guest total memory size smaller than specified in virtual configuration
due to Xen balloon driver (LP: #1622567)
- mm: introduce helper function mem_init_print_info() to simplify mem_init()
- xen/balloon: Set balloon's initial state to number of existing RAM pages

  * CVE-2016-6136
- audit: fix a double fetch in audit_log_single_execve_arg()

  * CVE-2016-6480
- aacraid: Check size values after double-fetch from user

  * CVE-2016-6828
- tcp: fix use after free in tcp_xmit_retransmit_queue()

 -- Kamal Mostafa   Wed, 21 Sep 2016 14:07:18 -0700

** Changed in: linux (Ubuntu Precise)
   Status: Fix Committed => Fix Released

** Changed in: linux (Ubuntu Precise)
   Status: Fix Committed => Fix Released

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.2.0-111.153

---
linux (3.2.0-111.153) precise; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
- LP: #1626151

  * Altering use_tempaddr drops all IPv6 addresses (LP: #994931)
- Revert "UBUNTU: SAUCE: ipv6: make the net.ipv6.conf.all.use_tempaddr 
sysctl
  propagate to interface settings"
- neigh: new unresolved queue limits
- neigh: Add device constructor/destructor capability.
- atm: clip: Use device neigh support on top of "arp_tbl".
- atm: clip: remove clip_tbl
- neigh: convert parms to an array
- neigh: wrap proc dointvec functions
- neigh: use tbl->family to distinguish ipv4 from ipv6
- neigh: restore old behaviour of default parms values
- neigh: ipv6: respect default values set before an address is assigned to
  device

  * Xen guest total memory size smaller than specified in virtual configuration
due to Xen balloon driver (LP: #1622567)
- mm: introduce helper function mem_init_print_info() to simplify mem_init()
- xen/balloon: Set balloon's initial state to number of existing RAM pages

  * CVE-2016-6136
- audit: fix a double fetch in audit_log_single_execve_arg()

  * CVE-2016-6480
- aacraid: Check size values after double-fetch from user

  * CVE-2016-6828
- tcp: fix use after free in tcp_xmit_retransmit_queue()

 -- Kamal Mostafa   Wed, 21 Sep 2016 14:07:18 -0700

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Title:
  Altering use_tempaddr drops all IPv6 addresses

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.13.0-98.145

---
linux (3.13.0-98.145) trusty; urgency=low

  * Fix GRO recursion overflow for tunneling protocols (LP: #1631287)
- tunnels: Don't apply GRO to multiple layers of encapsulation.

  * CVE-2016-7039
- SAUCE: net: add recursion limit to GRO

linux (3.13.0-97.144) trusty; urgency=low

  [ Joseph Salisbury ]

  * Release Tracking Bug
- LP: #1626604

  * Altering use_tempaddr drops all IPv6 addresses (LP: #994931)
- Revert "UBUNTU: SAUCE: (no-up) ipv6: Fix net.ipv6.conf.all.use_tempaddr
  sysctl"
- Revert "UBUNTU: SAUCE: (no-up) ipv6: make the 
net.ipv6.conf.all.use_tempaddr
  sysctl propagate to interface settings"
- neigh: convert parms to an array
- neigh: wrap proc dointvec functions
- neigh: use tbl->family to distinguish ipv4 from ipv6
- neigh: restore old behaviour of default parms values
- neigh: ipv6: respect default values set before an address is assigned to
  device

  * PCI quirk required for correct access to configuration space of NFP
4000/6000 (LP: #1624267)
- PCI: Support PCIe devices with short cfg_size
- PCI: Add Netronome vendor and device IDs
- PCI: Limit config space size for Netronome NFP6000 family
- PCI: Add Netronome NFP4000 PF device ID
- PCI: Limit config space size for Netronome NFP4000

  * CVE-2016-6136
- audit: fix a double fetch in audit_log_single_execve_arg()

  * CVE-2016-6480
- aacraid: Check size values after double-fetch from user

  * CVE-2016-6828
- tcp: fix use after free in tcp_xmit_retransmit_queue()

  * IPv6 with LVS Performance issue in latest 3.13LTS kernels (LP: #1618299)
- ipv6: remove prune parameter for fib6_clean_all
- ipv6: remove rt6i_genid

  * lsattr 32bit does not work on 64bit kernel (Inappropriate ioctl error)
(LP: #1619918)
- btrfs: bugfix: handle FS_IOC32_{GETFLAGS, SETFLAGS, GETVERSION} in
  btrfs_ioctl

  * Miscellaneous upstream changes
- powerpc/pseries: use pci_host_bridge.release_fn() to kfree(phb)

 -- Seth Forshee   Fri, 07 Oct 2016 20:08:32
-0500

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Title:
  Altering use_tempaddr drops all IPv6 addresses

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.13.0-98.145

---
linux (3.13.0-98.145) trusty; urgency=low

  * Fix GRO recursion overflow for tunneling protocols (LP: #1631287)
- tunnels: Don't apply GRO to multiple layers of encapsulation.

  * CVE-2016-7039
- SAUCE: net: add recursion limit to GRO

linux (3.13.0-97.144) trusty; urgency=low

  [ Joseph Salisbury ]

  * Release Tracking Bug
- LP: #1626604

  * Altering use_tempaddr drops all IPv6 addresses (LP: #994931)
- Revert "UBUNTU: SAUCE: (no-up) ipv6: Fix net.ipv6.conf.all.use_tempaddr
  sysctl"
- Revert "UBUNTU: SAUCE: (no-up) ipv6: make the 
net.ipv6.conf.all.use_tempaddr
  sysctl propagate to interface settings"
- neigh: convert parms to an array
- neigh: wrap proc dointvec functions
- neigh: use tbl->family to distinguish ipv4 from ipv6
- neigh: restore old behaviour of default parms values
- neigh: ipv6: respect default values set before an address is assigned to
  device

  * PCI quirk required for correct access to configuration space of NFP
4000/6000 (LP: #1624267)
- PCI: Support PCIe devices with short cfg_size
- PCI: Add Netronome vendor and device IDs
- PCI: Limit config space size for Netronome NFP6000 family
- PCI: Add Netronome NFP4000 PF device ID
- PCI: Limit config space size for Netronome NFP4000

  * CVE-2016-6136
- audit: fix a double fetch in audit_log_single_execve_arg()

  * CVE-2016-6480
- aacraid: Check size values after double-fetch from user

  * CVE-2016-6828
- tcp: fix use after free in tcp_xmit_retransmit_queue()

  * IPv6 with LVS Performance issue in latest 3.13LTS kernels (LP: #1618299)
- ipv6: remove prune parameter for fib6_clean_all
- ipv6: remove rt6i_genid

  * lsattr 32bit does not work on 64bit kernel (Inappropriate ioctl error)
(LP: #1619918)
- btrfs: bugfix: handle FS_IOC32_{GETFLAGS, SETFLAGS, GETVERSION} in
  btrfs_ioctl

  * Miscellaneous upstream changes
- powerpc/pseries: use pci_host_bridge.release_fn() to kfree(phb)

 -- Seth Forshee   Fri, 07 Oct 2016 20:08:32
-0500

** Changed in: linux (Ubuntu Trusty)
   Status: Fix Committed => Fix Released

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-6136

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-6480

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-6828

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-7039

** Changed in: linux (Ubuntu Trusty)
   Status: Fix Committed => Fix Released

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Title:
  Altering use_tempaddr drops all IPv6 addresses

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Joseph Salisbury]

** Tags removed: verification-needed-precise
** Tags added: verification-done-precise

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  Altering use_tempaddr drops all IPv6 addresses

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Philipp Kern]

Verified on trusty. Unfortunately I don't have a precise machine
anymore. After toggling use_tempaddr not all public addresses
disappeared with the new kernel while it happened with the old pre-
reboot.

** Tags removed: verification-needed-trusty
** Tags added: verification-done-trusty

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  Altering use_tempaddr drops all IPv6 addresses

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Brad Figg]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
trusty' to 'verification-done-trusty'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Brad Figg]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
precise' to 'verification-done-precise'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-precise

** Tags added: verification-needed-trusty

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  Altering use_tempaddr drops all IPv6 addresses

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Kamal Mostafa]

** Changed in: linux (Ubuntu Trusty)
   Status: In Progress => Fix Committed

** Changed in: linux (Ubuntu Precise)
   Status: In Progress => Fix Committed

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Philipp Kern]

Thanks, Kamal!

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Kamal Mostafa]

I'm not sure how/why this issue fell by the wayside, but the tested
patch sets have (just now) been submitted for review and inclusion in
both Precise and Trusty:

https://lists.ubuntu.com/archives/kernel-team/2016-September/080007.html

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Philipp Kern]

Where did this get stuck?

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Sven Mueller]

Ping.
The test kernel seems to fix this. Could it be pushed to Trusty?

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Sven Mueller]

Any chance this could be fixed in Trusty?

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[David Lawson]

The test kernel works (and fixes the problem) on precise, on our trusty
test server we don't have any network devices (other than lo0) with the
test kernel booted, so we can't really test the IPv6 aspect.

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Mathieu Trudel-Lapierre]

I can't exactly test that IPv6 is fine in general with this, but it
doesn't appear to have regressed on Trusty.

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Kamal Mostafa]

Test kernels for this issue (as explained in comment #23) are now
available for Precise (3.2-based) and Trusty (3.13-based), for both
amd64 and i386 systems.  To test, download *one* of these then install
with dpkg -i thatfile.deb:

http://kernel.ubuntu.com/~kamal/lp994931-ipv6/precise_amd64/linux-image-3.2.0-77-generic_3.2.0-77.112+lp994931_amd64.deb
http://kernel.ubuntu.com/~kamal/lp994931-ipv6/precise_i386/linux-image-3.2.0-77-generic_3.2.0-77.112+lp994931_i386.deb
http://kernel.ubuntu.com/~kamal/lp994931-ipv6/trusty_amd64/linux-image-3.13.0-46-generic_3.13.0-46.75+lp994931_amd64.deb
http://kernel.ubuntu.com/~kamal/lp994931-ipv6/trusty_i386/linux-image-3.13.0-46-generic_3.13.0-46.75+lp994931_i386.deb

We'd like feedback from affected parties who can test this on Trusty
3.13 and Precise 3.2 systems. Does this kernel resolve your issue, and
do you observe any obvious IP-related trouble with it?

For reference, the source code branches for those are here:

http://kernel.ubuntu.com/git?p=kamal/ubuntu-trusty.git;a=shortlog;h=refs/heads/lp994931-ipv6
http://kernel.ubuntu.com/git?p=kamal/ubuntu-precise.git;a=shortlog;h=refs/heads/lp994931-ipv6

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Kamal Mostafa]

I have prepared a test 3.13 kernel (for Trusty) which reverts the
Ubuntu-specific patch and adds the set of mainline patches that obviate
these issues in Utopic and newer versions.  My cursory testing suggests
that it resolves both this bug (drops all IPv6 addresses) and the
problem that the Ubuntu-specific patch addressed (make use_tempaddr
work as documented).

The test kernel package, for Trusty amd64 systems only, is here (install with 
dpkg -i thisfile.deb):
http://kernel.ubuntu.com/~kamal/lp994931-ipv6/linux-image-3.13.0-46-generic_3.13.0-46.75+lp994931_amd64.deb

We'd like feedback from affected parties who can test this on Trusty.
Does that kernel resolve your issue, and do you observe any obvious IP-
related trouble with it?

For reference, the source code branch for that Trusty test kernel is here:
http://kernel.ubuntu.com/git?p=kamal/ubuntu-trusty.git;a=shortlog;h=refs/heads/lp994931-ipv6

A resolution of this issue for 3.2-based Precise is still being
investigated.

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Andy Whitcroft]

** Changed in: linux (Ubuntu Precise)
   Importance: Undecided = High

** Changed in: linux (Ubuntu Trusty)
   Importance: Undecided = High

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Kamal Mostafa]

Just clarifying:  This wasn't Fix Released for Utopic; it just was
never an issue in Utopic (because only Precise and Trusty carry the
Ubuntu-specific patch that triggers it).

** Changed in: linux (Ubuntu Utopic)
   Status: Fix Released = Invalid

** Changed in: linux (Ubuntu Utopic)
 Assignee: Tim Gardner (timg-tpi) = (unassigned)

** Changed in: linux (Ubuntu)
   Status: Fix Released = Confirmed

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[James Troup]

We just had this bug take out two v6 environments (Canonical UK office
and Canonical VPN) after a procps package upgrade; it'd be wonderful if
we could get whatever is in utopic SRUed to the LTSes.

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Kamal Mostafa]

** Changed in: linux (Ubuntu)
 Assignee: Tim Gardner (timg-tpi) = Kamal Mostafa (kamalmostafa)

** Changed in: linux (Ubuntu Precise)
 Assignee: Tim Gardner (timg-tpi) = Kamal Mostafa (kamalmostafa)

** Changed in: linux (Ubuntu Trusty)
 Assignee: Tim Gardner (timg-tpi) = Kamal Mostafa (kamalmostafa)

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Scott Moser]

verified this works as expected in utopic.
  $ vals() { for i in net.ipv6.conf.all.use_tempaddr 
net.ipv6.conf.default.use_tempaddr; do 
  [ -n $1 ]  { sudo sysctl $i=$1 || return; } || sysctl $i; 
done; }
  $ vals 0
  net.ipv6.conf.all.use_tempaddr = 0
  net.ipv6.conf.default.use_tempaddr = 0

  $ sudo ip -6 addr del 2001:db8::1:3/64 dev eth0 /dev/null;
  $ sudo ip -6 addr add 2001:db8::1:3/64 dev eth0

  $ vals 2
  net.ipv6.conf.all.use_tempaddr = 2
  net.ipv6.conf.default.use_tempaddr = 2
  $ ip -6 addr show dev eth0
  2: eth0: BROADCAST,MULTICAST,UP,LOWER_UP mtu 1500 qlen 1000
inet6 2001:db8::1:3/64 scope global
   valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fefd:d570/64 scope link
   valid_lft forever preferred_lft forever
  $ vals 0
  net.ipv6.conf.all.use_tempaddr = 0
  net.ipv6.conf.default.use_tempaddr = 0

  $ ip -6 addr show dev eth0
  2: eth0: BROADCAST,MULTICAST,UP,LOWER_UP mtu 1500 qlen 1000
inet6 2001:db8::1:3/64 scope global
   valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fefd:d570/64 scope link
   valid_lft forever preferred_lft forever

  $ uname -r
  3.16.0-21-generic

** Changed in: linux (Ubuntu Utopic)
   Status: In Progress = Fix Released

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Andy Whitcroft]

The patch for this is currently stalled waiting on feedback on the
locking model in the patch.

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Trent Lloyd]

Just ran into this here.  I set use_tempaddr=0 in my sysctl.conf, and
was very confused why my IPv6 wasn't coming up on boot.  Can confirm
this is why.

This really needs to be fixed as it breaks IPv6 on boot.

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Tim Gardner]

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Precise)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Utopic)
   Importance: Medium
   Status: Triaged

** Changed in: linux (Ubuntu Precise)
   Status: New = In Progress

** Changed in: linux (Ubuntu Precise)
 Assignee: (unassigned) = Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Trusty)
   Status: New = In Progress

** Changed in: linux (Ubuntu Trusty)
 Assignee: (unassigned) = Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Utopic)
   Status: Triaged = In Progress

** Changed in: linux (Ubuntu Utopic)
 Assignee: (unassigned) = Tim Gardner (timg-tpi)

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Bug Watch Updater]

** Changed in: linux
   Status: Confirmed = Invalid

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Status: Confirmed = Triaged

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Malcolm Scott]

I've been in touch with Mathieu Trudel-Lapierre, the original author of
the Ubuntu patch I linked above, who tells me that his patch was
rejected upstream as Dave Miller does not want these semantics for 'all'
sysctls (and apparently the documentation, rather than the
implementation, is wrong):
http://lists.openwall.net/netdev/2011/12/19/103

Personally, I disagree with Dave as this makes the 'all' sysctl no
different to the 'default' one, and does not match the behaviour of what
I believe to be the majority of other 'all' sysctls.

More discussion here: http://ubuntu.5.n6.nabble.com/PATCH-ipv6-make-the-
net-ipv6-conf-all-use-tempaddr-sysctl-propagate-to-interface-settings-
td1728056.html

Anyway, perhaps the best way to continue for now will be to apply my
patch (once reviewed) to the Ubuntu kernel tree as it fixes a regression
caused by what is for now an Ubuntu-specific feature.

I will try to reopen discussion of this issue upstream but I think it's
pretty unlikely that I'll change Dave Miller's mind!

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Malcolm Scott]

Kernel packages with my patch applied are available in this PPA:
https://launchpad.net/~malcscott/+archive/lp994931

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Joseph Salisbury]

@Malcolm

I'll build a test kernel with the commit mentioned in comment #2
reverted.  I'll post a link to the test kernel shortly.

** Changed in: linux (Ubuntu)
   Importance: Undecided = Medium

** Tags added: kernel-da-key

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Joseph Salisbury]

I built a test kernel with commit
4bbefb4b1186b13d0d6100bd71d348a1efba017d  reverted. The test kernel is
located at:

http://people.canonical.com/~jsalisbury/lp994931

Can you test that kernel and report back if it resolves this bug?

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Malcolm Scott]

Alternatively: here's my attempt at fixing the IPv6 Privacy
implementation.  It could do with code review as I'm not absolutely sure
I've got the locking right (although I think I have!).

** Patch added: fixed IPv6 Privacy implementation
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/994931/+attachment/3152780/+files/ipv6-privacy-fix.diff

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Malcolm Scott]

jsalisbury: problem is, simply reverting that commit leaves us with IPv6
Privacy not working at all, and it's on by default now.  (There is at
least one upstream bug: e.g.
https://bugzilla.kernel.org/show_bug.cgi?id=42855)

I should add that I've tested my patch for a few days and it seems to
work fine.

** Bug watch added: Linux Kernel Bug Tracker #42855
   http://bugzilla.kernel.org/show_bug.cgi?id=42855

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Joseph Salisbury]

@Malcolm

Just curious if you sent your patch upstream as of yet?  If you have,
what sort of feedback has it received, is it getting applied to a
subsystem maintainer's tree, etc?

People affected by this bug are probably wondering why the kernel team
doesn't just apply the patch and fix it. The reason is that the kernel
team is reluctant (not opposed) to apply any patch to a stable kernel
that is not from upstream.  Applying patches that don't come from
upstream add greatly to the support of the kernel as other upstream
patches may touch the same area as the non-upstream patch and may
prevent them from applying cleanly.

** Also affects: linux via
   http://bugzilla.kernel.org/show_bug.cgi?id=42855
   Importance: Unknown
   Status: Unknown

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Malcolm Scott]

@jsalisbury

I would like to submit this upstream, although my patch is just fixing
the previous Ubuntu-specific commit I linked above.  Do you know whether
that has already been sent upstream?

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Ubuntu Foundation's Bug Bot]

** Tags added: patch

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Joseph Salisbury]

@Malcolm

I'm not sure if this has been addressed upstream as of yet.  I can do
some investigation.

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Bug Watch Updater]

** Changed in: linux
   Status: Unknown = Confirmed

** Changed in: linux
   Importance: Unknown = Medium

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Malcolm Scott]

apport information

** Tags added: apport-collected

** Description changed:

  $ uname -a
  Linux expvr-alnilam 3.2.0-24-generic-pae #37-Ubuntu SMP Wed Apr 25 10:47:59 
UTC 2012 i686 i686 i386 GNU/Linux
  
  $ sysctl net.ipv6.conf.eth2.use_tempaddr
  net.ipv6.conf.eth2.use_tempaddr = 2
  # (as per the default /etc/sysctl.d/10-ipv6-privacy.conf in 12.04)
  
  # Add a static IPv6 address:
  $ sudo ip addr add 2001:470:9321:f003::1122/64 dev eth2
  
  # Verify that it has been set up, and that a temporary address and a SLAAC 
address also exist:
  $ ip -6 addr list dev eth2
  4: eth2: BROADCAST,MULTICAST,UP,LOWER_UP mtu 1500 qlen 1000
  inet6 2001:470:9321:f003:74e3:aa2b:7ee5:c002/64 scope global temporary 
dynamic 
 valid_lft 86393sec preferred_lft 14393sec
  inet6 2001:470:9321:f003:6c97:24ff:fe3f:263b/64 scope global dynamic 
 valid_lft 86393sec preferred_lft 14393sec
  inet6 2001:470:9321:f003::1122/64 scope global 
 valid_lft forever preferred_lft forever
  inet6 fe80::6c97:24ff:fe3f:263b/64 scope link 
 valid_lft forever preferred_lft forever
  
  # Disable RFC 4941 temporary addresses:
  $ sudo sysctl net.ipv6.conf.eth2.use_tempaddr=0
  net.ipv6.conf.eth2.use_tempaddr = 0
  
  $ ip -6 addr list dev eth2
  4: eth2: BROADCAST,MULTICAST,UP,LOWER_UP mtu 1500 qlen 1000
  inet6 fe80::6c97:24ff:fe3f:263b/64 scope link tentative 
 valid_lft forever preferred_lft forever
  
  I.e. on setting use_tempaddr=0, _all_ IPv6 addresses are removed,
  including statically-configured and non-temporary SLAAC-configured
  addresses.  (The link-local address reappears quickly but the
  'tentative' flag indicates that it has been newly re-added.  The SLAAC
  address reappears after a slightly longer interval as the kernel
  continues to undergo SLAAC, but the static address is gone forever
  unless manually reinstated.)
  
  The same happens if use_tempaddr is changed from 0 back to 2.
  
- The expected outcome is that only temporary addresses are affected by a
- change to use_tempaddr.
+ The expected outcome is that only temporary addresses are affected by a 
change to use_tempaddr.
+ --- 
+ AcpiTables:
+  
+ AlsaDevices:
+  total 0
+  crw-rw---T 1 root audio 116,  1 May  5 03:53 seq
+  crw-rw---T 1 root audio 116, 33 May  5 03:53 timer
+ AplayDevices: Error: [Errno 2] No such file or directory
+ ApportVersion: 2.0.1-0ubuntu7
+ Architecture: i386
+ ArecordDevices: Error: [Errno 2] No such file or directory
+ AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
+ CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
+ CurrentDmesg:
+  
+ DistroRelease: Ubuntu 12.04
+ IwConfig: Error: [Errno 2] No such file or directory
+ Lspci: Error: [Errno 2] No such file or directory
+ Lsusb: Error: [Errno 2] No such file or directory
+ Package: linux (not installed)
+ PciMultimedia:
+  
+ ProcEnviron:
+  TERM=screen.linux
+  PATH=(custom, no user)
+  LANG=en_GB.UTF-8
+  SHELL=/bin/bash
+ ProcFB:
+  
+ ProcKernelCmdLine: root=UUID=b16ffd9c-a54a-4dd3-a839-16c382ea8787 ro  
console=hvc0
+ ProcModules:
+  lp 17455 0 - Live 0x
+  parport 40930 1 lp, Live 0x
+  xenfs 17877 1 - Live 0x
+ ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
+ RelatedPackageVersions:
+  linux-restricted-modules-3.2.0-24-generic-pae N/A
+  linux-backports-modules-3.2.0-24-generic-pae  N/A
+  linux-firmware1.79
+ RfKill: Error: [Errno 2] No such file or directory
+ Tags:  precise
+ Uname: Linux 3.2.0-24-generic-pae i686
+ UpgradeStatus: Upgraded to precise on 2012-05-05 (0 days ago)
+ UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

** Attachment added: BootDmesg.txt
   
https://bugs.launchpad.net/bugs/994931/+attachment/3132521/+files/BootDmesg.txt

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[Bug 994931] Re: Altering use_tempaddr drops all IPv6 addresses

[Malcolm Scott]

The cuplrit is likely to be lines 4355..4359 of net/ipv6/addrconf.c,
try to bring down and back up the interface to get new temporary
addresses created -- this has unwanted side-effects.  This seems to be
Ubuntu-specific code introduced in http://kernel.ubuntu.com/git?p=ubuntu
/ubuntu-
precise.git;a=commitdiff;h=d1852a54eef5c7b7dd2d026535b4c4d644cd .

I have verified that this bug does *not* occur on a mainline build of
Linux 3.4rc5.

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