Re: IPv6 prefix route lifetime

[Ryota Ozaki <ozaki-r%netbsd.org@localhost>]

On Tue, Aug 9, 2016 at 6:58 PM, Kengo NAKAHARA <k-nakahara%iij.ad.jp@localhost> wrote:
> Hi,
>
> On 2016/08/09 17:56, Roy Marples wrote:
>> On 08/08/2016 07:49, Ryota Ozaki wrote:
>>> I see the following errors.
>>
>> test rump tests currently panic on yesterdays buildable current which
>> makes fixing it hard.
>>
>>> === recursiveipv6overipv4 and recursiveipv6overipv6 ====
>>> tc-so:Executing command [ /bin/sh -c env
>>> LD_PRELOAD=/usr/lib/librumphijack.so RUMPHIJACK=sysctl=yes dmesg ]
>>> tc-se:Fail: regexp gif0: recursively called too many times not in stdout
>>
>> I don't understand this error.
>> Does it imply there is no output to parse?
>> I will try looking into why this happens in the gif driver.
>
> I think the packet might not be routed to gif(4) interface. To ensure
> that, could you try to apply below patch and show me the ping output
> message?
> ====================
> diff --git a/tests/net/if_gif/t_gif.sh b/tests/net/if_gif/t_gif.sh
> index 6337f23..28ef7bf 100644
> --- a/tests/net/if_gif/t_gif.sh
> +++ b/tests/net/if_gif/t_gif.sh
> @@ -467,6 +467,12 @@ test_recursive_check()
>                         rump.ping -n -w $TIMEOUT -c 1 $ROUTER2_GIFIP_RECURSIVE2
>         fi
>
> +       if [ ${mode} = "ipv6" ]; then
> +           rump.ping6 -n -X $TIMEOUT -c 1 $ROUTER2_GIFIP6_RECURSIVE2
> +       else
> +           rump.ping -n -w $TIMEOUT -c 1 $ROUTER2_GIFIP_RECURSIVE2
> +       fi
> +
>         atf_check -o match:'gif0: recursively called too many times' \
>                 -x "$HIJACKING dmesg"
> ====================

I run tests w/o and w/ the patch. The diff between netstat -nr -f inet6
of the two runs at that point is below. There are less routes to
gif interfaces.

  ozaki-r

====
--- /tmp/ok2    2016-08-09 19:37:02.000000000 +0900
+++ /tmp/bad    2016-08-09 19:32:52.000000000 +0900
@@ -1,29 +1,24 @@
+tc-so:Routing tables
+tc-so:
 tc-so:Internet6:
 tc-so:Destination                             Gateway
       Flags    Refs      Use    Mtu Interface
-tc-so:::1                                     ::1
       UH          -        -  33624  lo0
+tc-so:::1                                     lo0
       UHl         -        -  33624  lo0
 tc-so:fc00::/64                               link#3
       UC          -        -      -  shmif1
 tc-so:fc00::1                                 link#3
       UHl         -        -      -  lo0
 tc-so:fc00:1::/64                             link#2
       UC          -        -      -  shmif0
 tc-so:fc00:1::1                               link#2
       UHl         -        -      -  lo0
 tc-so:fc00:2::/64                             fc00:3::1
       UGS         -        -      -  gif0
 tc-so:fc00:3::1                               gif0
       UHl         -        -      -  lo0
-tc-so:fc00:4::1                               fc00:3::1
       UH          -        -      -  gif0
 tc-so:fc00:103::1                             gif1
       UHl         -        -      -  lo0
-tc-so:fc00:104::1                             fc00:103::1
       UH          -        -      -  gif1
 tc-so:fc00:203::1                             gif2
       UHl         -        -      -  lo0
-tc-so:fc00:204::1                             fc00:203::1
       UH          -        -      -  gif2
-tc-so:fe80::%lo0/64                           fe80::1
       U           -        -      -  lo0
 tc-so:fe80::1                                 lo0
       UHl         -        -      -  lo0
 tc-so:fe80::%shmif0/64                        link#2
       UC          -        -      -  shmif0
-tc-so:fe80::b0a0:8ff:febf:8209                link#2
       UHl         -        -      -  lo0
+tc-so:fe80::b0a0:5cff:fe88:824                link#2
       UHl         -        -      -  lo0
 tc-so:fe80::%shmif1/64                        link#3
       UC          -        -      -  shmif1
-tc-so:fe80::b0a0:3fff:fe7f:d40                link#3
       UHl         -        -      -  lo0
-tc-so:fe80::%gif0/64                          link#4
       UC          -        -      -  gif0
-tc-so:fe80::44c2:dfb3:fa37:6545               gif0
       UHl         -        -      -  lo0
-tc-so:fe80::%gif1/64                          link#5
       UC          -        -      -  gif1
-tc-so:fe80::44c2:dfb3:fa37:6545               gif1
       UHl         -        -      -  lo0
-tc-so:fe80::%gif2/64                          link#6
       UC          -        -      -  gif2
-tc-so:fe80::44c2:dfb3:fa37:6545               gif2
       UHl         -        -      -  lo0
+tc-so:fe80::b0a0:48ff:fee1:ea2f               link#3
       UHl         -        -      -  lo0
+tc-so:fe80::3895:f9c:dbf0:9132                gif0
       UHl         -        -      -  lo0
+tc-so:fe80::3895:f9c:dbf0:9132                gif1
       UHl         -        -      -  lo0
+tc-so:fe80::3895:f9c:dbf0:9132                gif2
       UHl         -        -      -  lo0
 tc-so:ff01:1::/32                             ::1
       UC          -        -  33624  lo0
 tc-so:ff01:2::/32                             link#2
       UC          -        -      -  shmif0
 tc-so:ff01:3::/32                             link#3
       UC          -        -      -  shmif1