mirror/libbpf
1
0
Fork 0
mirror of https://github.com/netdata/libbpf.git synced 2026-03-29 04:39:06 +08:00
Code Issues Packages Projects Releases Wiki Activity

libbpf: Add support for program extensions

Browse Source 
Add minimal support for program extensions. bpf_object_open_opts() needs to be
called with attach_prog_fd = target_prog_fd and BPF program extension needs to
have in .c file section definition like SEC("freplace/func_to_be_replaced").
libbpf will search for "func_to_be_replaced" in the target_prog_fd's BTF and
will pass it in attach_btf_id to the kernel. This approach works for tests, but
more compex use case may need to request function name (and attach_btf_id that
kernel sees) to be more dynamic. Such API will be added in future patches.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20200121005348.2769920-3-ast@kernel.org
This commit is contained in:
Alexei Starovoitov
2020-01-20 16:53:47 -08:00
committed by Andrii Nakryiko
parent c69f0d12f3
commit c6c86a53f2
6 changed files with 18 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/libbpf.map
View File

@@ -228,7 +228,9 @@ LIBBPF_0.0.7 {
bpf_prog_attach_xattr;
bpf_program__attach;
bpf_program__name;
bpf_program__is_extension;
bpf_program__is_struct_ops;
bpf_program__set_extension;
bpf_program__set_struct_ops;
btf__align_of;
libbpf_find_kernel_btf;