Toke Høiland-Jørgensen <[email protected]> writes:
> Toke Høiland-Jørgensen <[email protected]> writes:
>
>> "Jason A. Donenfeld" <[email protected]> writes:
>>
>>> On Thu, Mar 8, 2018 at 6:50 PM, Toke Høiland-Jørgensen <[email protected]> wrote:
>>>> Well, I do generally setup routing in a somewhat unusual manner.
>>>>
>>>> I can try to capture some packet dumps tomorrow to poke into it a bit
>>>> more. Anything in particular I should look for?
>>>
>>> One thing to examine is when WireGuard calls
>>> `socket_clear_peer_endpoint_src'. This makes wireguard forget the
>>> source address that it should be using and fall back to the default.
>>> You could add a pr_info(...) call in this function. I have an inkling
>>> that I make calls to this function too zealously and in potentially
>>> unneeded places, such as on handshake transmission retries.
>>>
>>> I'm headed out of town super soon, so likely debugging this will have
>>> to wait until I'm back, but do let me know what you find, and we'll
>>> get this fixed up upon return.
>>
>> Well, completely failed to reproduce it; everything works as its
>> supposed to now (wireguard correctly picks the public IP as its source
>> address when replying to the client).
>>
>> Not sure if I have changed something in my setup or what is going on;
>> but at least I can roam now, so I'm happy ;)
>
> Scratch that, it's still happening; just not straight away upon roaming.
> It is definitely a timeout thing; installed a kprobe on the function you
> mentioned and got this strack trace when it switches IP:
>
> TIME(s) FUNCTION
> 104.999884129 socket_clear_peer_endpoint_src
> socket_clear_peer_endpoint_src
> expired_new_handshake
> call_timer_fn
> run_timer_softirq
> __do_softirq
> irq_exit
> smp_apic_timer_interrupt
> __irqentry_text_start
> cpuidle_enter_state
> do_idle
> cpu_startup_entry
> start_secondary
> secondary_startup_64
And leaving it running a bit more, there is also a call from
expired_retransmit_handshake:
449.079751015 socket_clear_peer_endpoint_src
socket_clear_peer_endpoint_src
expired_retransmit_handshake
call_timer_fn
run_timer_softirq
__do_softirq
irq_exit
smp_apic_timer_interrupt
__irqentry_text_start
cpuidle_enter_state
do_idle
cpu_startup_entry
start_secondary
secondary_startup_64
-Toke
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