Unfortunately some distros don't have their kernel version defined
accurately in <linux/version.h> due to different long term support
reasons.
It is important to have a way to override the bpf kern_version
attribute during runtime: some old kernels might still check for
kern_version attribute during bpf_prog_load().
Signed-off-by: Rafael David Tinoco <rafaeldtinoco@xxxxxxxxxx>
---
src/libbpf.c | 10 ++++++++++
src/libbpf.h | 1 +
2 files changed, 11 insertions(+)
diff --git a/src/libbpf.c b/src/libbpf.c
index 2f351d3..3b1c79f 100644
--- a/src/libbpf.c
+++ b/src/libbpf.c
@@ -8278,6 +8278,16 @@ int bpf_object__btf_fd(const struct bpf_object *obj)
return obj->btf ? btf__fd(obj->btf) : -1;
}
+int bpf_object__set_kversion(struct bpf_object *obj, __u32 kern_version)
+{
+ if (obj->loaded)
+ return -1;
+
+ obj->kern_version = kern_version;
+
+ return 0;
+}
+
int bpf_object__set_priv(struct bpf_object *obj, void *priv,
bpf_object_clear_priv_t clear_priv)
{
diff --git a/src/libbpf.h b/src/libbpf.h
index 3c35eb4..f73ec5b 100644
--- a/src/libbpf.h
+++ b/src/libbpf.h
@@ -143,6 +143,7 @@ LIBBPF_API int bpf_object__unload(struct bpf_object *obj);
LIBBPF_API const char *bpf_object__name(const struct bpf_object *obj);
LIBBPF_API unsigned int bpf_object__kversion(const struct bpf_object *obj);
+LIBBPF_API int bpf_object__set_kversion(struct bpf_object *obj, __u32 kern_version);
struct btf;
LIBBPF_API struct btf *bpf_object__btf(const struct bpf_object *obj);
--
2.27.0
