if (!OPTS_ZEROED(opts, kprobe_multi))
return libbpf_err(-EINVAL);
break;
+ case BPF_TRACE_FENTRY:
+ case BPF_TRACE_FEXIT:
+ case BPF_MODIFY_RETURN:
+ case BPF_LSM_MAC:
+ attr.link_create.tracing.cookie = OPTS_GET(opts, tracing.cookie, 0);
+ if (!OPTS_ZEROED(opts, tracing))
+ return libbpf_err(-EINVAL);
+ break;
default:
if (!OPTS_ZEROED(opts, flags))
return libbpf_err(-EINVAL);
}
/* Common logic for all BPF program types that attach to a btf_id */
-static struct bpf_link *bpf_program__attach_btf_id(const struct bpf_program *prog)
+static struct bpf_link *bpf_program__attach_btf_id(const struct bpf_program *prog,
+ const struct bpf_trace_opts *opts)
{
+ LIBBPF_OPTS(bpf_link_create_opts, link_opts);
char errmsg[STRERR_BUFSIZE];
struct bpf_link *link;
int prog_fd, pfd;
+ if (!OPTS_VALID(opts, bpf_trace_opts))
+ return libbpf_err_ptr(-EINVAL);
+
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {
pr_warn("prog '%s': can't attach before loaded\n", prog->name);
link->detach = &bpf_link__detach_fd;
/* libbpf is smart enough to redirect to BPF_RAW_TRACEPOINT_OPEN on old kernels */
- pfd = bpf_link_create(prog_fd, 0, bpf_program__expected_attach_type(prog), NULL);
+ link_opts.tracing.cookie = OPTS_GET(opts, cookie, 0);
+ pfd = bpf_link_create(prog_fd, 0, bpf_program__expected_attach_type(prog), &link_opts);
if (pfd < 0) {
pfd = -errno;
free(link);
struct bpf_link *bpf_program__attach_trace(const struct bpf_program *prog)
{
- return bpf_program__attach_btf_id(prog);
+ return bpf_program__attach_btf_id(prog, NULL);
+}
+
+struct bpf_link *bpf_program__attach_trace_opts(const struct bpf_program *prog,
+ const struct bpf_trace_opts *opts)
+{
+ return bpf_program__attach_btf_id(prog, opts);
}
struct bpf_link *bpf_program__attach_lsm(const struct bpf_program *prog)
{
- return bpf_program__attach_btf_id(prog);
+ return bpf_program__attach_btf_id(prog, NULL);
}
static int attach_trace(const struct bpf_program *prog, long cookie, struct bpf_link **link)
LIBBPF_API struct bpf_link *
bpf_program__attach_raw_tracepoint(const struct bpf_program *prog,
const char *tp_name);
+
+struct bpf_trace_opts {
+ /* size of this struct, for forward/backward compatibility */
+ size_t sz;
+ /* custom user-provided value fetchable through bpf_get_attach_cookie() */
+ __u64 cookie;
+};
+#define bpf_trace_opts__last_field cookie
+
LIBBPF_API struct bpf_link *
bpf_program__attach_trace(const struct bpf_program *prog);
+LIBBPF_API struct bpf_link *
+bpf_program__attach_trace_opts(const struct bpf_program *prog, const struct bpf_trace_opts *opts);
+
LIBBPF_API struct bpf_link *
bpf_program__attach_lsm(const struct bpf_program *prog);
LIBBPF_API struct bpf_link *
bpf_object__destroy_subskeleton;
bpf_object__open_subskeleton;
bpf_program__attach_kprobe_multi_opts;
+ bpf_program__attach_trace_opts;
bpf_program__attach_usdt;
libbpf_register_prog_handler;
libbpf_unregister_prog_handler;