netdev - Re: iproute2 bug in json output for encap

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Date:   Fri, 14 Apr 2023 18:12:06 +0200
From:   Lars Ekman <uablrek@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: Re: iproute2 bug in json output for encap

Hi,

Thanks for the reply. You are right, it is jq that eats one ot the
double "dst" items.

vm-002 ~ # ip -j -p route show proto 5
[ {
        "dst": "192.168.11.0/24",
        "encap": "ip6",
        "id": 0,
        "src": "::",
        "dst": "fd00::c0a8:2dd",
        "hoplimit": 0,
        "tc": 0,
        "dev": "dummy0",
        "scope": "link",
        "flags": [ ]
    } ]
vm-002 ~ # ip -j -p route show proto 5 | jq
[
  {
    "dst": "fd00::c0a8:2dd",
    "encap": "ip6",
    "id": 0,
    "src": "::",
    "hoplimit": 0,
    "tc": 0,
    "dev": "dummy0",
    "scope": "link",
    "flags": []
  }
]

Sorry for the fuss.

Best Regards,

Lars Ekman


And btw I did upgrade *before* posting :-)

vm-002 ~ # ip -V
ip utility, iproute2-6.2.0, libbpf 1.1.0
vm-002 ~ # uname -r
6.2.7



On 2023-04-14 17:21, Stephen Hemminger wrote:
> On Fri, 14 Apr 2023 10:29:15 +0200
> Lars Ekman <uablrek@...il.com> wrote:
>
>> The destination is lost in json printout and replaced by the encap 
>> destination. The destination can even be ipv6 for an ipv4 route.
>>
>> Example:
>>
>> vm-002 ~ # ip route add 10.0.0.0/24 proto 5 dev ip6tnl6 encap ip6 dst 
>> fd00::192.168.2.221
>> vm-002 ~ # ip route show proto 5
>> 10.0.0.0/24  encap ip6 id 0 src :: dst fd00::c0a8:2dd hoplimit 0 tc 0 
>> dev ip6tnl6 scope link
>> vm-002 ~ # ip -j route show proto 5 | jq
>> [
>>    {
>>      "dst": "fd00::c0a8:2dd",
>>      "encap": "ip6",
>>      "id": 0,
>>      "src": "::",
>>      "hoplimit": 0,
>>      "tc": 0,
>>      "dev": "ip6tnl6",
>>      "scope": "link",
>>      "flags": []
>>    }
>> ]
>>
> Both JSON and regular output show the same address which is coming from
> the kernel.  I.e not a JSON problem. Also, you don't need to use jq
> ip has -p flag to pretty print.
>
> I can not reproduce this with current kernel and iproute2.
> # ip route add 192.168.11.0/24 proto 5 dev dummy0 encap ip6 dst fd00::192.168.2.221
>
> # ip route show proto 5
> 192.168.11.0/24  encap ip6 id 0 src :: dst fd00::c0a8:2dd hoplimit 0 tc 0 dev dummy0 scope link 
>
> # ip -j -p route show proto 5
> [ {
>         "dst": "192.168.11.0/24",
>         "encap": "ip6",
>         "id": 0,
>         "src": "::",
>         "dst": "fd00::c0a8:2dd",
>         "hoplimit": 0,
>         "tc": 0,
>         "dev": "dummy0",
>         "scope": "link",
>         "flags": [ ]
>     } ]
>
>
> # ip -V
> ip utility, iproute2-6.1.0, libbpf 1.1.0
> # uname -r
> 6.1.0-7-amd64
>
>