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From:   William Tu <u9012063@gmail.com>
Date:   Tue, 26 Jun 2018 14:27:10 -0700
Message-ID: <CALDO+Sap3GTW3Ud4u-950ZicXpqfCh3kV5x8FVFpPmH+snOsGg@mail.gmail.com>
Subject: Re: [PATCH] selftests: bpf: config: add config fragments
To:     Anders Roxell <anders.roxell@linaro.org>
Cc:     Daniel Borkmann <daniel@iogearbox.net>,
        Alexei Starovoitov <ast@kernel.org>,
        Shuah Khan <shuah@kernel.org>,
        Networking <netdev@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>
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>> >
>> > --- ::11 ping statistics ---
>> > 5 packets transmitted, 3 packets received, 40% packet loss
>> > round-trip min/avg/max = 0.139/1.857/5.293 ms
>> > + ip netns exec at_ns0 ping -c 3 -w 10 -q 10.1.1.200
>> > PING 10.1.1.200 (10.1.1.200): 56 data bytes
>> >
>> > --- 10.1.1.200 ping statistics ---
>> > 3 packets transmitted, 3 packets received, 0% packet loss
>> > round-trip min/avg/max = 0.214/0.256/0.305 ms
>> > + ping -c 3 -w 10 -q 10.1.1.100
>> > PING 10.1.1.100 (10.1.1.100): 56 data bytes
>> >
>> > --- 10.1.1.100 ping statistics ---
>> > 3 packets transmitted, 3 packets received, 0% packet loss
>> > round-trip min/avg/max = 0.210/0.211/0.213 ms
>> > + check_err 0
>> > + '[' 0 -eq 0 ']'
>> > + ret=0

So looks like the ipv4 over ipv6 gre passes.

>> > + ip netns exec at_ns0 ping6 -c 3 -w 10 -q fc80::200
>> > PING fc80::200 (fc80::200): 56 data bytes
>> >
>> > --- fc80::200 ping statistics ---
>> > 10 packets transmitted, 0 packets received, 100% packet loss
`
but the ipv6 over ipv6 gre fails.
Do you have any firewall rules that block this traffic?
or if possible, the packet might get dropped at function ip6gre_xmit_ipv6
can you print the return value of this function?


>> > + check_err 1
>> > + '[' 0 -eq 0 ']'
>> > + ret=1
>> > + ip -s link show ip6gretap11
>> > 19: ip6gretap11@NONE: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1434 qdisc
>> > pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000
>> >     link/ether de:d2:0c:53:80:8c brd ff:ff:ff:ff:ff:ff
>> >     RX: bytes  packets  errors  dropped overrun mcast
>> >     2096       25       0       0       0       0
>> >     TX: bytes  packets  errors  dropped carrier collsns
>> >     5324       36       5       5       0       0
>>
>> So there are 5 errors at TX.
>
> and today when I tried it on next-20180620 I saw 8 errors at TX.
>
>> I couldn't reproduce in my local machine using 4.17-rc6.
>> How do I checkin the "next-20180613" source code?
>
> You can find the source code here [1], and I would look in the latest tag that I
> said that I was able to reproduce it on above.
>
> Cheers,
> Anders
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/

Hi Anders,

I'm still not able to reproduce the issue on next-20180620.
Below is my test.

Testing IP6GRETAP tunnel...
PING ::11(::11) 56 data bytes

--- ::11 ping statistics ---
5 packets transmitted, 3 received, 40% packet loss, time 4048ms
rtt min/avg/max/mdev = 0.040/32.118/96.235/45.337 ms
PING 10.1.1.200 (10.1.1.200) 56(84) bytes of data.

--- 10.1.1.200 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2026ms
rtt min/avg/max/mdev = 0.074/0.099/0.117/0.018 ms
PING 10.1.1.100 (10.1.1.100) 56(84) bytes of data.

--- 10.1.1.100 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2054ms
rtt min/avg/max/mdev = 0.069/0.113/0.187/0.052 ms
PING fc80::200(fc80::200) 56 data bytes

--- fc80::200 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2054ms
rtt min/avg/max/mdev = 0.069/0.104/0.142/0.031 ms
PASS: ip6gretap
root@osboxes:~/linux-next/tools/testing/selftests/bpf#
root@osboxes:~/linux-next/tools/testing/selftests/bpf# uname -a
Linux osboxes 4.18.0-rc1-next-20180620 #1 SMP Tue Jun 26 12:26:00 PDT
2018 x86_64 x86_64 x86_64 GNU/Linux