-/* SPDX-License-Identifier: LGPL-2.1+ */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#include "bpf-dlopen.h"
#include "bpf-link.h"
#include "serialize.h"
-bool can_link_bpf_program(struct bpf_program *prog) {
+bool bpf_can_link_program(struct bpf_program *prog) {
_cleanup_(bpf_link_freep) struct bpf_link *link = NULL;
assert(prog);
+ if (dlopen_bpf() < 0)
+ return false;
+
/* Pass invalid cgroup fd intentionally. */
- link = bpf_program__attach_cgroup(prog, /*cgroup_fd=*/-1);
+ link = sym_bpf_program__attach_cgroup(prog, /*cgroup_fd=*/-1);
/* EBADF indicates that bpf_link is supported by kernel. */
- return libbpf_get_error(link) == -EBADF;
+ return bpf_get_error_translated(link) == -EBADF;
}
-int serialize_bpf_link(FILE *f, FDSet *fds, const char *key, struct bpf_link *link) {
- int fd;
-
+int bpf_serialize_link(FILE *f, FDSet *fds, const char *key, struct bpf_link *link) {
assert(key);
if (!link)
return -ENOENT;
- if (libbpf_get_error(link) != 0)
+ if (bpf_get_error_translated(link) != 0)
return -EINVAL;
- fd = bpf_link__fd(link);
- return serialize_fd(f, fds, key, fd);
+ return serialize_fd(f, fds, key, sym_bpf_link__fd(link));
+}
+
+struct bpf_link* bpf_link_free(struct bpf_link *link) {
+ /* If libbpf wasn't dlopen()ed, sym_bpf_link__destroy might be unresolved (NULL), so let's not try to
+ * call it if link is NULL. link might also be a non-null "error pointer", but such a value can only
+ * originate from a call to libbpf, but that means that libbpf is available, and we can let
+ * bpf_link__destroy() handle it. */
+ if (link)
+ (void) sym_bpf_link__destroy(link);
+
+ return NULL;
}
-struct bpf_link *bpf_link_free(struct bpf_link *link) {
- /* bpf_link__destroy handles link == NULL case */
- (void) bpf_link__destroy(link);
+struct ring_buffer* bpf_ring_buffer_free(struct ring_buffer *rb) {
+ if (rb) /* See the comment in bpf_link_free(). */
+ sym_ring_buffer__free(rb);
return NULL;
}