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
 7void 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;
82out:
83	bpf_set_link_xdp_fd(IFINDEX_LO, -1, 0);
84out_close:
85	bpf_object__close(obj3);
86out_2:
87	bpf_object__close(obj2);
88out_1:
89	bpf_object__close(obj1);
90}