selftests/bpf: Add combined fentry/fexit test

Add a combined fentry/fexit test.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20191114185720.1641606-12-ast@kernel.org

diff --git a/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c b/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c
new file mode 100644 (file)
index 0000000..40bcff2
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 Facebook */
+#include <test_progs.h>
+
+void test_fentry_fexit(void)
+{
+       struct bpf_prog_load_attr attr_fentry = {
+               .file = "./fentry_test.o",
+       };
+       struct bpf_prog_load_attr attr_fexit = {
+               .file = "./fexit_test.o",
+       };
+
+       struct bpf_object *obj_fentry = NULL, *obj_fexit = NULL, *pkt_obj;
+       struct bpf_map *data_map_fentry, *data_map_fexit;
+       char fentry_name[] = "fentry/bpf_fentry_testX";
+       char fexit_name[] = "fexit/bpf_fentry_testX";
+       int err, pkt_fd, kfree_skb_fd, i;
+       struct bpf_link *link[12] = {};
+       struct bpf_program *prog[12];
+       __u32 duration, retval;
+       const int zero = 0;
+       u64 result[12];
+
+       err = bpf_prog_load("./test_pkt_access.o", BPF_PROG_TYPE_SCHED_CLS,
+                           &pkt_obj, &pkt_fd);
+       if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
+               return;
+       err = bpf_prog_load_xattr(&attr_fentry, &obj_fentry, &kfree_skb_fd);
+       if (CHECK(err, "prog_load fail", "err %d errno %d\n", err, errno))
+               goto close_prog;
+       err = bpf_prog_load_xattr(&attr_fexit, &obj_fexit, &kfree_skb_fd);
+       if (CHECK(err, "prog_load fail", "err %d errno %d\n", err, errno))
+               goto close_prog;
+
+       for (i = 0; i < 6; i++) {
+               fentry_name[sizeof(fentry_name) - 2] = '1' + i;
+               prog[i] = bpf_object__find_program_by_title(obj_fentry, fentry_name);
+               if (CHECK(!prog[i], "find_prog", "prog %s not found\n", fentry_name))
+                       goto close_prog;
+               link[i] = bpf_program__attach_trace(prog[i]);
+               if (CHECK(IS_ERR(link[i]), "attach_trace", "failed to link\n"))
+                       goto close_prog;
+       }
+       data_map_fentry = bpf_object__find_map_by_name(obj_fentry, "fentry_t.bss");
+       if (CHECK(!data_map_fentry, "find_data_map", "data map not found\n"))
+               goto close_prog;
+
+       for (i = 6; i < 12; i++) {
+               fexit_name[sizeof(fexit_name) - 2] = '1' + i - 6;
+               prog[i] = bpf_object__find_program_by_title(obj_fexit, fexit_name);
+               if (CHECK(!prog[i], "find_prog", "prog %s not found\n", fexit_name))
+                       goto close_prog;
+               link[i] = bpf_program__attach_trace(prog[i]);
+               if (CHECK(IS_ERR(link[i]), "attach_trace", "failed to link\n"))
+                       goto close_prog;
+       }
+       data_map_fexit = bpf_object__find_map_by_name(obj_fexit, "fexit_te.bss");
+       if (CHECK(!data_map_fexit, "find_data_map", "data map not found\n"))
+               goto close_prog;
+
+       err = bpf_prog_test_run(pkt_fd, 1, &pkt_v6, sizeof(pkt_v6),
+                               NULL, NULL, &retval, &duration);
+       CHECK(err || retval, "ipv6",
+             "err %d errno %d retval %d duration %d\n",
+             err, errno, retval, duration);
+
+       err = bpf_map_lookup_elem(bpf_map__fd(data_map_fentry), &zero, &result);
+       if (CHECK(err, "get_result",
+                 "failed to get output data: %d\n", err))
+               goto close_prog;
+
+       err = bpf_map_lookup_elem(bpf_map__fd(data_map_fexit), &zero, result + 6);
+       if (CHECK(err, "get_result",
+                 "failed to get output data: %d\n", err))
+               goto close_prog;
+
+       for (i = 0; i < 12; i++)
+               if (CHECK(result[i] != 1, "result", "bpf_fentry_test%d failed err %ld\n",
+                         i % 6 + 1, result[i]))
+                       goto close_prog;
+
+close_prog:
+       for (i = 0; i < 12; i++)
+               if (!IS_ERR_OR_NULL(link[i]))
+                       bpf_link__destroy(link[i]);
+       bpf_object__close(obj_fentry);
+       bpf_object__close(obj_fexit);
+       bpf_object__close(pkt_obj);
+}