Linux bpftool Installation / Ubuntu 18.04, CentOS 7 Environment

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1. Installation Environment

The installation environment is as follows.

1.1. Ubuntu

Ubuntu 18.04.1 LTS
Linux 4.15.0-45-generic

1.2. CentOS

CentOS 7
Linux 4.19.4-1.el7.elrepo.x86-64

2. Package Installation

2.1. Ubuntu

$ apt-get install build-essential 
$ apt-get install binutils-dev
$ apt-get install libelf-dev

Install libraries required for bpftool building.

2.2. CentOS

$ yum groupinstall "Development Tools"
$ yum install binutils-devel
$ yum install elfutils-libelf-devel

Install libraries required for bpftool building.

3. bpftool Build & Installation

$ git clone https://github.com/torvalds/linux.git
$ cd linux
$ git checkout v4.20

Since it is not currently provided as a package for Ubuntu and CentOS, download the kernel code and build bpftool directly. Kernel version v4.20 or higher is required to use bpftool’s net and perf options.

$ make -C tools/bpf/bpftool/
$ cp tools/bpf/bpftool/bpftool /usr/sbin

Build bpftool.

3.1. Compile Error Resolution

$ make -C tools/bpf/bpftool/
...
/usr/include/linux/if.h:76:2: error: redeclaration of enumerator [01mIFF-NOTRAILERS
  IFF-NOTRAILERS   = 1<<5,  /* sysfs */
  ^
/usr/include/net/if.h:54:5: note: previous definition of [01mIFF-NOTRAILERSwas here
     IFF-NOTRAILERS = 0x20, /* Avoid use of trailers.  */
     ^
/usr/include/linux/if.h:77:2: error: redeclaration of enumerator [01mIFF-RUNNING
  IFF-RUNNING   = 1<<6,  /* --volatile-- */
  ^
/usr/include/net/if.h:56:5: note: previous definition of [01mIFF-RUNNINGwas here
     IFF-RUNNING = 0x40,  /* Resources allocated.  */
...

When a compile error occurs due to conflicts between linux/if.h and net/if.h, the above symptoms appear.

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...
#include <libbpf.h>
//#include <net/if.h>
#include <linux/if.h>
...

[File 1] tools/bpf/bpftool/net.c

Modify the tools/bpf/bpftool/net.c file as shown in [File 1].

4. References

KVM, QEMU Installation and Execution / Ubuntu 14.04 Environment Linux Kernel ChangeLog Download