1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include <network_helpers.h>
4
5 void test_skb_ctx(void)
6 {
7 struct __sk_buff skb = {
8 .cb[0] = 1,
9 .cb[1] = 2,
10 .cb[2] = 3,
11 .cb[3] = 4,
12 .cb[4] = 5,
13 .priority = 6,
14 .ingress_ifindex = 11,
15 .ifindex = 1,
16 .tstamp = 7,
17 .wire_len = 100,
18 .gso_segs = 8,
19 .mark = 9,
20 .gso_size = 10,
21 .hwtstamp = 11,
22 };
23 LIBBPF_OPTS(bpf_test_run_opts, tattr,
24 .data_in = &pkt_v4,
25 .data_size_in = sizeof(pkt_v4),
26 .ctx_in = &skb,
27 .ctx_size_in = sizeof(skb),
28 .ctx_out = &skb,
29 .ctx_size_out = sizeof(skb),
30 );
31 struct bpf_object *obj;
32 int err, prog_fd, i;
33
34 err = bpf_prog_test_load("./test_skb_ctx.bpf.o", BPF_PROG_TYPE_SCHED_CLS,
35 &obj, &prog_fd);
36 if (!ASSERT_OK(err, "load"))
37 return;
38
39 /* ctx_in != NULL, ctx_size_in == 0 */
40
41 tattr.ctx_size_in = 0;
42 err = bpf_prog_test_run_opts(prog_fd, &tattr);
43 ASSERT_NEQ(err, 0, "ctx_size_in");
44 tattr.ctx_size_in = sizeof(skb);
45
46 /* ctx_out != NULL, ctx_size_out == 0 */
47
48 tattr.ctx_size_out = 0;
49 err = bpf_prog_test_run_opts(prog_fd, &tattr);
50 ASSERT_NEQ(err, 0, "ctx_size_out");
51 tattr.ctx_size_out = sizeof(skb);
52
53 /* non-zero [len, tc_index] fields should be rejected*/
54
55 skb.len = 1;
56 err = bpf_prog_test_run_opts(prog_fd, &tattr);
57 ASSERT_NEQ(err, 0, "len");
58 skb.len = 0;
59
60 skb.tc_index = 1;
61 err = bpf_prog_test_run_opts(prog_fd, &tattr);
62 ASSERT_NEQ(err, 0, "tc_index");
63 skb.tc_index = 0;
64
65 /* non-zero [hash, sk] fields should be rejected */
66
67 skb.hash = 1;
68 err = bpf_prog_test_run_opts(prog_fd, &tattr);
69 ASSERT_NEQ(err, 0, "hash");
70 skb.hash = 0;
71
72 skb.sk = (struct bpf_sock *)1;
73 err = bpf_prog_test_run_opts(prog_fd, &tattr);
74 ASSERT_NEQ(err, 0, "sk");
75 skb.sk = 0;
76
77 err = bpf_prog_test_run_opts(prog_fd, &tattr);
78 ASSERT_OK(err, "test_run");
79 ASSERT_OK(tattr.retval, "test_run retval");
80 ASSERT_EQ(tattr.ctx_size_out, sizeof(skb), "ctx_size_out");
81
82 for (i = 0; i < 5; i++)
83 ASSERT_EQ(skb.cb[i], i + 2, "ctx_out_cb");
84 ASSERT_EQ(skb.priority, 7, "ctx_out_priority");
85 ASSERT_EQ(skb.ifindex, 1, "ctx_out_ifindex");
86 ASSERT_EQ(skb.ingress_ifindex, 11, "ctx_out_ingress_ifindex");
87 ASSERT_EQ(skb.tstamp, 8, "ctx_out_tstamp");
88 ASSERT_EQ(skb.mark, 10, "ctx_out_mark");
89
90 bpf_object__close(obj);
91 }
92
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