1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 
4 #define IFINDEX_LO 1
5 #define XDP_FLAGS_REPLACE		(1U << 4)
6 
7 void serial_test_xdp_attach(void)
8 {
9 	__u32 duration = 0, id1, id2, id0 = 0, len;
10 	struct bpf_object *obj1, *obj2, *obj3;
11 	const char *file = "./test_xdp.o";
12 	struct bpf_prog_info info = {};
13 	int err, fd1, fd2, fd3;
14 	DECLARE_LIBBPF_OPTS(bpf_xdp_set_link_opts, opts,
15 			    .old_fd = -1);
16 
17 	len = sizeof(info);
18 
19 	err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj1, &fd1);
20 	if (CHECK_FAIL(err))
21 		return;
22 	err = bpf_obj_get_info_by_fd(fd1, &info, &len);
23 	if (CHECK_FAIL(err))
24 		goto out_1;
25 	id1 = info.id;
26 
27 	err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj2, &fd2);
28 	if (CHECK_FAIL(err))
29 		goto out_1;
30 
31 	memset(&info, 0, sizeof(info));
32 	err = bpf_obj_get_info_by_fd(fd2, &info, &len);
33 	if (CHECK_FAIL(err))
34 		goto out_2;
35 	id2 = info.id;
36 
37 	err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj3, &fd3);
38 	if (CHECK_FAIL(err))
39 		goto out_2;
40 
41 	err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd1, XDP_FLAGS_REPLACE,
42 				       &opts);
43 	if (CHECK(err, "load_ok", "initial load failed"))
44 		goto out_close;
45 
46 	err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0);
47 	if (CHECK(err || id0 != id1, "id1_check",
48 		  "loaded prog id %u != id1 %u, err %d", id0, id1, err))
49 		goto out_close;
50 
51 	err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd2, XDP_FLAGS_REPLACE,
52 				       &opts);
53 	if (CHECK(!err, "load_fail", "load with expected id didn't fail"))
54 		goto out;
55 
56 	opts.old_fd = fd1;
57 	err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd2, 0, &opts);
58 	if (CHECK(err, "replace_ok", "replace valid old_fd failed"))
59 		goto out;
60 	err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0);
61 	if (CHECK(err || id0 != id2, "id2_check",
62 		  "loaded prog id %u != id2 %u, err %d", id0, id2, err))
63 		goto out_close;
64 
65 	err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd3, 0, &opts);
66 	if (CHECK(!err, "replace_fail", "replace invalid old_fd didn't fail"))
67 		goto out;
68 
69 	err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, -1, 0, &opts);
70 	if (CHECK(!err, "remove_fail", "remove invalid old_fd didn't fail"))
71 		goto out;
72 
73 	opts.old_fd = fd2;
74 	err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, -1, 0, &opts);
75 	if (CHECK(err, "remove_ok", "remove valid old_fd failed"))
76 		goto out;
77 
78 	err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0);
79 	if (CHECK(err || id0 != 0, "unload_check",
80 		  "loaded prog id %u != 0, err %d", id0, err))
81 		goto out_close;
82 out:
83 	bpf_set_link_xdp_fd(IFINDEX_LO, -1, 0);
84 out_close:
85 	bpf_object__close(obj3);
86 out_2:
87 	bpf_object__close(obj2);
88 out_1:
89 	bpf_object__close(obj1);
90 }
91