bpf, selftests: Test probe_* helpers from SCHED_CLS

Lets test using probe* in SCHED_CLS network programs as well just
to be sure these keep working. Its cheap to add the extra test
and provides a second context to test outside of sk_msg after
we generalized probe* helpers to all networking types.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/159033911685.12355.15951980509828906214.stgit@john-Precision-5820-Tower
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/testing/selftests/bpf/prog_tests/skb_helpers.c b/tools/testing/selftests/bpf/prog_tests/skb_helpers.c
new file mode 100644 (file)
index 0000000..f302ad8
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/skb_helpers.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include <network_helpers.h>
+
+void test_skb_helpers(void)
+{
+       struct __sk_buff skb = {
+               .wire_len = 100,
+               .gso_segs = 8,
+               .gso_size = 10,
+       };
+       struct bpf_prog_test_run_attr tattr = {
+               .data_in = &pkt_v4,
+               .data_size_in = sizeof(pkt_v4),
+               .ctx_in = &skb,
+               .ctx_size_in = sizeof(skb),
+               .ctx_out = &skb,
+               .ctx_size_out = sizeof(skb),
+       };
+       struct bpf_object *obj;
+       int err;
+
+       err = bpf_prog_load("./test_skb_helpers.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
+                           &tattr.prog_fd);
+       if (CHECK_ATTR(err, "load", "err %d errno %d\n", err, errno))
+               return;
+       err = bpf_prog_test_run_xattr(&tattr);
+       CHECK_ATTR(err, "len", "err %d errno %d\n", err, errno);
+       bpf_object__close(obj);
+}

diff --git a/tools/testing/selftests/bpf/progs/test_skb_helpers.c b/tools/testing/selftests/bpf/progs/test_skb_helpers.c
new file mode 100644 (file)
index 0000000..bb3fbf1
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_skb_helpers.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+
+#define TEST_COMM_LEN 16
+
+struct {
+       __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY);
+       __uint(max_entries, 1);
+       __type(key, u32);
+       __type(value, u32);
+} cgroup_map SEC(".maps");
+
+char _license[] SEC("license") = "GPL";
+
+SEC("classifier/test_skb_helpers")
+int test_skb_helpers(struct __sk_buff *skb)
+{
+       struct task_struct *task;
+       char comm[TEST_COMM_LEN];
+       __u32 tpid;
+
+       task = (struct task_struct *)bpf_get_current_task();
+       bpf_probe_read_kernel(&tpid , sizeof(tpid), &task->tgid);
+       bpf_probe_read_kernel_str(&comm, sizeof(comm), &task->comm);
+       return 0;
+}