netdev - Re: iproute2: Debian 9 No ELF support

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Message-ID: <21f89be4-7664-532e-5283-2c8961b527b8@iogearbox.net>
Date:   Mon, 17 Sep 2018 14:07:13 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     yuzibode@....com
Cc:     netdev@...r.kernel.org
Subject: Re: iproute2: Debian 9 No ELF support

On 09/17/2018 01:46 PM, Bo YU wrote:
> On Mon, Sep 17, 2018 at 11:57:12AM +0200, Daniel Borkmann wrote:
>> On 09/17/2018 10:23 AM, Bo YU wrote:
>>> Hello,
>>> I have followed the instructions from:
>>>
>>> https://cilium.readthedocs.io/en/latest/bpf/#bpftool
>>>
>>> to test xdp program.
>>> But i can not enable elf support.
>>>
>>> ./configure --prefix=/usr
>>> ```output
>>> TC schedulers
>>> ATM    no
>>>
>>> libc has setns: yes
>>> SELinux support: no
>>> ELF support: no
>>> libmnl support: yes
>>> Berkeley DB: yes
>>> need for strlcpy: yes
>>> libcap support: yes
>>> ```
>>> And i have installed libelf-dev :
>>> ```output
>>> sudo apt show libelf-dev
>>> Package: libelf-dev
>>> Version: 0.168-1
>>> Priority: optional
>>> Section: libdevel
>>> Source: elfutils
>>> Maintainer: Kurt Roeckx <kurt@...ckx.be>
>>> Installed-Size: 353 kB
>>> Depends: libelf1 (= 0.168-1)
>>> Conflicts: libelfg0-dev
>>> Homepage: https://sourceware.org/elfutils/
>>> Tag: devel::library, role::devel-lib
>>> ```
>>>
>>> And gcc version:
>>> gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1)
>>>
>>> uname -a:
>>> Linux debian 4.18.0-rc1+ #2 SMP Sun Jun 24 16:53:57 HKT 2018 x86_64 GNU/Linux
>>>
>>> Any help is appreciate.
>>
>> Debian's official iproute2 packaging build says 'libelf-dev' [0], and having
>> libelf-dev installed should work ...
>>
>>  [...]
>>  Build-Depends: bison,
>>               debhelper (>= 10~),
>>               flex,
>>               iptables-dev,
>>               libatm1-dev,
>>               libcap-dev,
>>               libdb-dev,
>>               libelf-dev,
>>               libmnl-dev,
>>               libselinux1-dev,
>>               linux-libc-dev,
>>               pkg-config,
>>               po-debconf,
>>               zlib1g-dev,
>>  [...]
>>
>> Did you ran into this one perhaps [1]? Do you have zlib1g-dev installed?
> Yes,You are right. I install zlib1g-dev with your help,iproute2 enable ELF
> support.
> ```output
> ./configure --prefix=/usr
> TC schedulers
> ATM    no
> 
> libc has setns: yes
> SELinux support: no
> ELF support: yes
> libmnl support: yes
> Berkeley DB: yes
> need for strlcpy: yes
> libcap support: yes
> 
> ```
> But there is no effect after [1], right? When i install libelf-dev,it should
> install zlib1g-dev also.
> 
> Is there any way to update the page [2]?

This bug should be Debian specific, so it would make sense to contact Debian
developers or comment on [1] if it's still not resolved in current versions.

> Thank you, Daniel
> 
> [2] https://cilium.readthedocs.io/en/latest/bpf/#bpftool
>>
>>  [0] https://salsa.debian.org/debian/iproute2/blob/master/debian/control
>>  [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=885071