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networkd: IPv6PrivacyExtensions=kernel doesn't honor kernel setting #18003

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flokli opened this issue Dec 16, 2020 · 1 comment · Fixed by #18069
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networkd: IPv6PrivacyExtensions=kernel doesn't honor kernel setting #18003

flokli opened this issue Dec 16, 2020 · 1 comment · Fixed by #18069
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network

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@flokli
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flokli commented Dec 16, 2020

systemd version the issue has been seen with

247, 247.1

Used distribution

NixOS

Linux kernel version used (uname -a)

Linux 5.4.83

CPU architecture issue was seen on

x86_64

Expected behaviour you didn't see

networkd honors the net.ipv6.conf.$interface.use_tempaddr sysctl values set when IPv6PrivacyExtensions=kernel is set

Unexpected behaviour you saw

net.ipv6.conf.$interface.use_tempaddr is -1, no IPv6 private IP addresses are assigned, traffic goes out with the EUI-64 address

Steps to reproduce the problem

Configure your interface with IPv6PrivacyExtensions=kernel, set the net.ipv6.conf.$interface.use_tempaddr sysctl to 2`, plug it into a network with IPv6 router advertisements

Bisecting showed this seems to have been introduced by 5e0534f, which was part of #17240. More details are in NixOS/nixpkgs#106858 (comment).
This was referenced Dec 16, 2020
Closed
Merged
flokli added a commit to flokli/nixpkgs that referenced this issue Dec 16, 2020
@flokli
nixos/network-interfaces-systemd: fix IPv6 privacy extensions
e1a5006 
networkd seems to be buggy with IPv6PrivacyExtensions=kernel being set,
and the addresses don't appear anymore. In fact, the corresponding
sysctl seems to be set to -1 again.

Fixes NixOS#106858.
Upstream Issue: systemd/systemd#18003
FRidh pushed a commit to NixOS/nixpkgs that referenced this issue Dec 17, 2020
@flokli @FRidh
nixos/network-interfaces-systemd: fix IPv6 privacy extensions
d349582 
networkd seems to be buggy with IPv6PrivacyExtensions=kernel being set,
and the addresses don't appear anymore. In fact, the corresponding
sysctl seems to be set to -1 again.

Fixes #106858.
Upstream Issue: systemd/systemd#18003
flokli added a commit to flokli/systemd that referenced this issue Dec 23, 2020
@flokli
network: fix IPv6PrivacyExtensions=kernel handling
175ce3f 
When set to "kernel", systemd is not supposed to touch that sysctl.

e0534f1c13cd50ec2b143a8b18156cd37e502f7, part of
systemd#17240 forgot to handle that
case.

Fixes systemd#18003
@flokli flokli mentioned this issue Dec 23, 2020
Merged
yuwata pushed a commit to flokli/systemd that referenced this issue Dec 23, 2020
@flokli @yuwata
network: fix IPv6PrivacyExtensions=kernel handling
d3ccb1b 
When set to "kernel", systemd is not supposed to touch that sysctl.

5e0534f, part of
systemd#17240 forgot to handle that
case.

Fixes systemd#18003
@WhoNeedszZz
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Considering this has to do with privacy why has this not been patched yet?

yuwata pushed a commit to yuwata/systemd-stable that referenced this issue Jan 20, 2021
@flokli @yuwata
network: fix IPv6PrivacyExtensions=kernel handling
85a6314 
When set to "kernel", systemd is not supposed to touch that sysctl.

5e0534f, part of
systemd/systemd#17240 forgot to handle that
case.

Fixes systemd/systemd#18003

(cherry picked from commit d3ccb1b)
keszybz pushed a commit to systemd/systemd-stable that referenced this issue Feb 2, 2021
@flokli @keszybz
network: fix IPv6PrivacyExtensions=kernel handling
242fc1d 
When set to "kernel", systemd is not supposed to touch that sysctl.

5e0534f, part of
systemd/systemd#17240 forgot to handle that
case.

Fixes systemd/systemd#18003

(cherry picked from commit d3ccb1b)
flokli added a commit to flokli/nixpkgs that referenced this issue Feb 3, 2021
@flokli
Revert "nixos/network-interfaces-systemd: fix IPv6 privacy extensions"
24bebfa 
This reverts commit d349582.

The workaround initially applied isn't necessary anymore, as 247.3
contains the following commit:

> 242fc1d261 network: fix IPv6PrivacyExtensions=kernel handling

… which fixes systemd/systemd#18003.
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network: fix IPv6PrivacyExtensions=kernel flokli/systemd
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@flokli @WhoNeedszZz @poettering