1// SPDX-License-Identifier: GPL-2.0
2#include <test_progs.h>
3#include <network_helpers.h>
4
5void 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