iproute2: Debian 9 No ELF support

iproute2: Debian 9 No ELF support

[Bo YU]

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@roeckx.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.

Re: iproute2: Debian 9 No ELF support

[Daniel Borkmann]

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@roeckx.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?

  [0] https://salsa.debian.org/debian/iproute2/blob/master/debian/control
  [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=885071

Re: iproute2: Debian 9 No ELF support

[Bo YU]

Hi,
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@roeckx.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]?

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

Re: iproute2: Debian 9 No ELF support

[Daniel Borkmann]

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@roeckx.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