linux bpftool not found in linux-tools-common for kernel 4.19.232

Question

I am trying to check if bpf is properly installed in my linux kernel. It's enabled in the kernel as shown:

jakew@desktop:~$ cat config | grep BPF
CONFIG_CGROUP_BPF=y
CONFIG_BPF=y
CONFIG_BPF_SYSCALL=y
CONFIG_BPF_JIT_ALWAYS_ON=y
# CONFIG_BPF_UNPRIV_DEFAULT_OFF is not set
CONFIG_IPV6_SEG6_BPF=y
CONFIG_NETFILTER_XT_MATCH_BPF=y
CONFIG_BPFILTER=y
CONFIG_BPFILTER_UMH=m
CONFIG_NET_CLS_BPF=y
CONFIG_NET_ACT_BPF=y
CONFIG_BPF_JIT=y
CONFIG_BPF_STREAM_PARSER=y
CONFIG_LWTUNNEL_BPF=y
CONFIG_HAVE_EBPF_JIT=y
CONFIG_BPF_EVENTS=y
# CONFIG_TEST_BPF is not set

I tried to install bpftool to check up on bpf, and it seems like i need to install it via linux_tools_common with: sudo apt install linux_tools_common. When I tried to run bpftool, it showed this error:

WARNING: bpftool not found for kernel 4.19.232

  You may need to install the following packages for this specific kernel:
    linux-tools-4.19.232-4.19.232
    linux-cloud-tools-4.19.232-4.19.232

  You may also want to install one of the following packages to keep up to date:
    linux-tools-4.19.232
    linux-cloud-tools-4.19.232

however, sudo apt install linux-tools-4.19.232 showed an error saying package not found.

Not sure how I can get bpftool to work so that I can explore more into bpf?

Thanks

Answer 1

It's probably easier to install from sources. That way you'll also be sure to have the latest version.

git clone --recurse-submodules https://github.com/libbpf/bpftool.git
cd bpftool/src
make -j$(nproc)
sudo ./bpftool prog