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libbpf-bootstrap-android
2023-9-14 16:18
Framework
JiaHuann
Android
ebpf-framework
cross-compile
For amd64 aarch machine to directly using libbpf-bootstrap framwork to write ebpf programs both kernel and user space.And you don't need to have `CONFIG_BTF_DEBUG_INFO` support by using externel BTF file in BTFhubForAndroid instead.For this goal,I did some changes on libbpf-bootstrap,and have done some embedded features.Wish this can help you sth.Best regards.

Libbpf-bootstrap for android

For amd64 aarch machine to directly using libbpf-bootstrap framwork to write ebpf programs both kernel and user space.And you don't need to have CONFIG_BTF_DEBUG_INFO support by using externel BTF file in BTFhubForAndroid instead.For this goal,I did some changes on libbpf-bootstrap,and have done some embedded features.Wish this can help you sth.Best regards.

upstream:

prerare

  • Android NDK
  • gcc-aarch64-linux-gnu
  • Android phone with root and unlock BL

usage

  • deps
https://github.com/JiaHuann/libbpf-bootstrap-android
cd libbpf-bootstrap-android
sudo apt install gcc-aarch64-linux-gnu llvm clang 
wget https://dl.google.com/android/repository/android-ndk-r25c-linux.zip?hl=zh-cn android-ndk-r25c-linux.zip
unzip android-ndk-r25c-linux
  • set NDK env to $PATH
vim ~/.bashrc
export your android-ndk-r25c/toolchains/llvm/prebuilt/linux-x86_64/bin to PATH
  • compile and push to phone
cd examples/c && make

adb devices
adb remount     # may fail, you can leave with issure.
adb push examples/c/btf_file/* example/c/your_executable_file /data/local/tmp
adb shell    #into android kernel shell
  • in android shell
cd /data/local/tmp && chmod +x your_excutable_file
./run
Congratulations!

feature

  • libelf,libz on aarcj64 embedded.
  • x86 -> android13(aarch64) cross-compile you can directly write ebpf both kernel-program and user-program on x86 machine.
  • FlameGraph embedded to monitor performance.
  • For None BTF/vmlinux android-kernel(CONFIG_DEBUG_INFO_BTF not set) support.
  • adb debug (after compiling&linking, directly push into android-phone) embedded.

RoadMap:

  • change the static link to ShareLib.
  • Measure the eBPF program's overhead by FlameGraph.
  • Add more Android features into support.
  • Test for lower Android version.