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Re: [Regression?] fib_rules: Added NLM_F_EXCL support to fib_nl_newrule breaks Android userspace

From David Miller <davem@davemloft.net>
Newsgroups linux.kernel
Subject Re: [Regression?] fib_rules: Added NLM_F_EXCL support to fib_nl_newrule breaks Android userspace
Date 2016-07-29 06:30 +0200
Message-ID <s07AR-89U-1@gated-at.bofh.it> (permalink)
References <s07rb-83j-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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From: John Stultz <john.stultz@linaro.org>
Date: Thu, 28 Jul 2016 21:18:16 -0700

> After moving my HiKey tree to pre-v4.8-rc, I noticed when using
> Android that I was getting routing errors after toggling networking on
> and off (or entering suspend). Wifi associated, but I got some
> rounting errors in the logcat the connection manager wouldn't detect a
> valid network.
> 
> Not being able to figure out exactly what was going wrong from the
> userspace side, I bisected (manually rebasing a 70 patch stack each
> step :P) it down and it seems that the commit: 153380ec4b9b
> ("fib_rules: Added NLM_F_EXCL support to fib_nl_newrule") is causing
> the problem.
> 
> Reverting that patch seems to make things work again.
> 
> I'm no networking guru, but I'm happy to help debug this further if
> folks can walk me through it a bit.

It simply sounds like Android's userspace is specifying NLM_F_EXCL when
it shouldn't be during FIB rule netlink operations.

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Thread

[Regression?] fib_rules: Added NLM_F_EXCL support to fib_nl_newrule  breaks Android userspace John Stultz <john.stultz@linaro.org> - 2016-07-29 06:20 +0200
  Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace David Miller <davem@davemloft.net> - 2016-07-29 06:30 +0200
    Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace David Ahern <dsa@cumulusnetworks.com> - 2016-07-29 16:20 +0200
      Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace John Stultz <john.stultz@linaro.org> - 2016-07-29 19:00 +0200
        Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace David Ahern <dsa@cumulusnetworks.com> - 2016-07-29 21:20 +0200
        Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace Lorenzo Colitti <lorenzo@google.com> - 2016-08-01 03:50 +0200
          Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace John Stultz <john.stultz@linaro.org> - 2016-08-02 18:40 +0200
            Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace David Ahern <dsa@cumulusnetworks.com> - 2016-08-02 19:10 +0200
              Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace David Miller <davem@davemloft.net> - 2016-08-02 20:20 +0200
                Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace David Miller <davem@davemloft.net> - 2016-08-02 20:30 +0200
                Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace John Stultz <john.stultz@linaro.org> - 2016-08-02 20:40 +0200
                Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace Lorenzo Colitti <lorenzo@google.com> - 2016-08-03 03:00 +0200
                Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace David Miller <davem@davemloft.net> - 2016-08-03 03:20 +0200
              Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace John Stultz <john.stultz@linaro.org> - 2016-08-02 21:00 +0200
            Re: [Regression?] fib_rules: Added NLM_F_EXCL support to  fib_nl_newrule breaks Android userspace John Stultz <john.stultz@linaro.org> - 2016-08-02 19:10 +0200

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