1// SPDX-License-Identifier: GPL-2.0
2#include <test_progs.h>
3#include "test_xdp_attach_fail.skel.h"
4
5#define IFINDEX_LO 1
6#define XDP_FLAGS_REPLACE		(1U << 4)
7
8static void test_xdp_attach(const char *file)
9{
10	__u32 duration = 0, id1, id2, id0 = 0, len;
11	struct bpf_object *obj1, *obj2, *obj3;
12	struct bpf_prog_info info = {};
13	int err, fd1, fd2, fd3;
14	LIBBPF_OPTS(bpf_xdp_attach_opts, opts);
15
16	len = sizeof(info);
17
18	err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj1, &fd1);
19	if (CHECK_FAIL(err))
20		return;
21	err = bpf_prog_get_info_by_fd(fd1, &info, &len);
22	if (CHECK_FAIL(err))
23		goto out_1;
24	id1 = info.id;
25
26	err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj2, &fd2);
27	if (CHECK_FAIL(err))
28		goto out_1;
29
30	memset(&info, 0, sizeof(info));
31	err = bpf_prog_get_info_by_fd(fd2, &info, &len);
32	if (CHECK_FAIL(err))
33		goto out_2;
34	id2 = info.id;
35
36	err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj3, &fd3);
37	if (CHECK_FAIL(err))
38		goto out_2;
39
40	err = bpf_xdp_attach(IFINDEX_LO, fd1, XDP_FLAGS_REPLACE, &opts);
41	if (CHECK(err, "load_ok", "initial load failed"))
42		goto out_close;
43
44	err = bpf_xdp_query_id(IFINDEX_LO, 0, &id0);
45	if (CHECK(err || id0 != id1, "id1_check",
46		  "loaded prog id %u != id1 %u, err %d", id0, id1, err))
47		goto out_close;
48
49	err = bpf_xdp_attach(IFINDEX_LO, fd2, XDP_FLAGS_REPLACE, &opts);
50	if (CHECK(!err, "load_fail", "load with expected id didn't fail"))
51		goto out;
52
53	opts.old_prog_fd = fd1;
54	err = bpf_xdp_attach(IFINDEX_LO, fd2, 0, &opts);
55	if (CHECK(err, "replace_ok", "replace valid old_fd failed"))
56		goto out;
57	err = bpf_xdp_query_id(IFINDEX_LO, 0, &id0);
58	if (CHECK(err || id0 != id2, "id2_check",
59		  "loaded prog id %u != id2 %u, err %d", id0, id2, err))
60		goto out_close;
61
62	err = bpf_xdp_attach(IFINDEX_LO, fd3, 0, &opts);
63	if (CHECK(!err, "replace_fail", "replace invalid old_fd didn't fail"))
64		goto out;
65
66	err = bpf_xdp_detach(IFINDEX_LO, 0, &opts);
67	if (CHECK(!err, "remove_fail", "remove invalid old_fd didn't fail"))
68		goto out;
69
70	opts.old_prog_fd = fd2;
71	err = bpf_xdp_detach(IFINDEX_LO, 0, &opts);
72	if (CHECK(err, "remove_ok", "remove valid old_fd failed"))
73		goto out;
74
75	err = bpf_xdp_query_id(IFINDEX_LO, 0, &id0);
76	if (CHECK(err || id0 != 0, "unload_check",
77		  "loaded prog id %u != 0, err %d", id0, err))
78		goto out_close;
79out:
80	bpf_xdp_detach(IFINDEX_LO, 0, NULL);
81out_close:
82	bpf_object__close(obj3);
83out_2:
84	bpf_object__close(obj2);
85out_1:
86	bpf_object__close(obj1);
87}
88
89#define ERRMSG_LEN 64
90
91struct xdp_errmsg {
92	char msg[ERRMSG_LEN];
93};
94
95static void on_xdp_errmsg(void *ctx, int cpu, void *data, __u32 size)
96{
97	struct xdp_errmsg *ctx_errmg = ctx, *tp_errmsg = data;
98
99	memcpy(&ctx_errmg->msg, &tp_errmsg->msg, ERRMSG_LEN);
100}
101
102static const char tgt_errmsg[] = "Invalid XDP flags for BPF link attachment";
103
104static void test_xdp_attach_fail(const char *file)
105{
106	struct test_xdp_attach_fail *skel = NULL;
107	struct xdp_errmsg errmsg = {};
108	struct perf_buffer *pb = NULL;
109	struct bpf_object *obj = NULL;
110	int err, fd_xdp;
111
112	LIBBPF_OPTS(bpf_link_create_opts, opts);
113
114	skel = test_xdp_attach_fail__open_and_load();
115	if (!ASSERT_OK_PTR(skel, "test_xdp_attach_fail__open_and_load"))
116		goto out_close;
117
118	err = test_xdp_attach_fail__attach(skel);
119	if (!ASSERT_EQ(err, 0, "test_xdp_attach_fail__attach"))
120		goto out_close;
121
122	/* set up perf buffer */
123	pb = perf_buffer__new(bpf_map__fd(skel->maps.xdp_errmsg_pb), 1,
124			      on_xdp_errmsg, NULL, &errmsg, NULL);
125	if (!ASSERT_OK_PTR(pb, "perf_buffer__new"))
126		goto out_close;
127
128	err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &fd_xdp);
129	if (!ASSERT_EQ(err, 0, "bpf_prog_test_load"))
130		goto out_close;
131
132	opts.flags = 0xFF; // invalid flags to fail to attach XDP prog
133	err = bpf_link_create(fd_xdp, IFINDEX_LO, BPF_XDP, &opts);
134	if (!ASSERT_EQ(err, -EINVAL, "bpf_link_create"))
135		goto out_close;
136
137	/* read perf buffer */
138	err = perf_buffer__poll(pb, 100);
139	if (!ASSERT_GT(err, -1, "perf_buffer__poll"))
140		goto out_close;
141
142	ASSERT_STRNEQ((const char *) errmsg.msg, tgt_errmsg,
143		      42 /* strlen(tgt_errmsg) */, "check error message");
144
145out_close:
146	perf_buffer__free(pb);
147	bpf_object__close(obj);
148	test_xdp_attach_fail__destroy(skel);
149}
150
151void serial_test_xdp_attach(void)
152{
153	if (test__start_subtest("xdp_attach"))
154		test_xdp_attach("./test_xdp.bpf.o");
155	if (test__start_subtest("xdp_attach_dynptr"))
156		test_xdp_attach("./test_xdp_dynptr.bpf.o");
157	if (test__start_subtest("xdp_attach_failed"))
158		test_xdp_attach_fail("./xdp_dummy.bpf.o");
159}
160