Python BPF Assembler.

Based on the BPF assembler in Linux sources.

Wheels are available.

To build from source you need a relatively recent Flex & Bison:

• On Windows, you can use winflexbison.
• On macOS (and sometimes on Linux, on older distributions), you can install them from Homebrew. Note that you might have to add Homebrew's version to the front of the PATH, e.g. PATH="$(brew --prefix)/opt/flex/bin:$(brew --prefix)/opt/bison/bin:$PATH".

import bpf_asm


ASM = """\
    ldh [12]
    jeq #0x800, accept, drop
accept:
    ret #65536
drop:
    ret #0
"""

print(bpf_asm.assemble(ASM))

Or use the pybpf_asm script. See pybpf_asm --help for usage.

GPL-2.0-only.