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
8 static 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;
79 out:
80 bpf_xdp_detach(IFINDEX_LO, 0, NULL);
81 out_close:
82 bpf_object__close(obj3);
83 out_2:
84 bpf_object__close(obj2);
85 out_1:
86 bpf_object__close(obj1);
87 }
88
89 #define ERRMSG_LEN 64
90
91 struct xdp_errmsg {
92 char msg[ERRMSG_LEN];
93 };
94
95 static 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
102 static const char tgt_errmsg[] = "Invalid XDP flags for BPF link attachment";
103
104 static 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
145 out_close:
146 perf_buffer__free(pb);
147 bpf_object__close(obj);
148 test_xdp_attach_fail__destroy(skel);
149 }
150
151 void 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
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