On Fri, Aug 13, 2021 at 10:23 AM Yonghong Song <yhs@xxxxxx> wrote:
>
>
>
> On 8/11/21 6:36 PM, Mohan Parthasarathy wrote:
> > Hi,
> >
> > I looked in the samples and header files, but could not find an
> > example for this. How does one convert this from bcc to libbpf. This
> > is the userspace code.
> >
> > bpf = BPF(src_file = "socket_filter.c", debug=0)
> > socket_filter = bpf.load_func("socket_filter", BPF.SOCKET_FILTER)
> > BPF.attach_raw_socket(socket_filter, "eth2")
> > socket_fd = socket_filter.sock
> >
> > I can do the following to set the type:
> >
> > err = bpf_program__set_socket_filter(obj);
> >
> > Is there any sample I can follow or any header files where I can look
> > for attaching a socket to the bpf code.
>
> There are a few examples in linux/samples/bpf directory:
>
> [~/work/bpf-next/samples/bpf] grep SOCKET_F *.c
> cookie_uid_helper_example.c: prog_fd =
> bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER, prog,
> fds_example.c: return bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER,
> sockex1_user.c: if (bpf_prog_load(filename, BPF_PROG_TYPE_SOCKET_FILTER,
> sockex2_user.c: if (bpf_prog_load(filename, BPF_PROG_TYPE_SOCKET_FILTER,
> sock_example.c: prog_fd = bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER,
just please don't use bpf_load_program and bpf_prog_load, use proper
bpf_object APIs or BPF skeleton for loading programs.
> prog, insns_cnt,
>
> They should provide an example how to attach a socket_filter program
> to a socket.
You can probably also look at recently added bpf_tc_* APIs in
tools/testing/selftests/bpf/prog_tests/tc_bpf.c. I've CC'ed Kumar who
added those APIs recently.
>
> >
> > Thanks
> > Mohan
> >
