1// SPDX-License-Identifier: GPL-2.0
 2#include <test_progs.h>
 3
 4void test_skb_ctx(void)
 5{
 6	struct __sk_buff skb = {
 7		.cb[0] = 1,
 8		.cb[1] = 2,
 9		.cb[2] = 3,
10		.cb[3] = 4,
11		.cb[4] = 5,
12		.priority = 6,
13	};
14	struct bpf_prog_test_run_attr tattr = {
15		.data_in = &pkt_v4,
16		.data_size_in = sizeof(pkt_v4),
17		.ctx_in = &skb,
18		.ctx_size_in = sizeof(skb),
19		.ctx_out = &skb,
20		.ctx_size_out = sizeof(skb),
21	};
22	struct bpf_object *obj;
23	int err;
24	int i;
25
26	err = bpf_prog_load("./test_skb_ctx.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
27			    &tattr.prog_fd);
28	if (CHECK_ATTR(err, "load", "err %d errno %d\n", err, errno))
29		return;
30
31	/* ctx_in != NULL, ctx_size_in == 0 */
32
33	tattr.ctx_size_in = 0;
34	err = bpf_prog_test_run_xattr(&tattr);
35	CHECK_ATTR(err == 0, "ctx_size_in", "err %d errno %d\n", err, errno);
36	tattr.ctx_size_in = sizeof(skb);
37
38	/* ctx_out != NULL, ctx_size_out == 0 */
39
40	tattr.ctx_size_out = 0;
41	err = bpf_prog_test_run_xattr(&tattr);
42	CHECK_ATTR(err == 0, "ctx_size_out", "err %d errno %d\n", err, errno);
43	tattr.ctx_size_out = sizeof(skb);
44
45	/* non-zero [len, tc_index] fields should be rejected*/
46
47	skb.len = 1;
48	err = bpf_prog_test_run_xattr(&tattr);
49	CHECK_ATTR(err == 0, "len", "err %d errno %d\n", err, errno);
50	skb.len = 0;
51
52	skb.tc_index = 1;
53	err = bpf_prog_test_run_xattr(&tattr);
54	CHECK_ATTR(err == 0, "tc_index", "err %d errno %d\n", err, errno);
55	skb.tc_index = 0;
56
57	/* non-zero [hash, sk] fields should be rejected */
58
59	skb.hash = 1;
60	err = bpf_prog_test_run_xattr(&tattr);
61	CHECK_ATTR(err == 0, "hash", "err %d errno %d\n", err, errno);
62	skb.hash = 0;
63
64	skb.sk = (struct bpf_sock *)1;
65	err = bpf_prog_test_run_xattr(&tattr);
66	CHECK_ATTR(err == 0, "sk", "err %d errno %d\n", err, errno);
67	skb.sk = 0;
68
69	err = bpf_prog_test_run_xattr(&tattr);
70	CHECK_ATTR(err != 0 || tattr.retval,
71		   "run",
72		   "err %d errno %d retval %d\n",
73		   err, errno, tattr.retval);
74
75	CHECK_ATTR(tattr.ctx_size_out != sizeof(skb),
76		   "ctx_size_out",
77		   "incorrect output size, want %lu have %u\n",
78		   sizeof(skb), tattr.ctx_size_out);
79
80	for (i = 0; i < 5; i++)
81		CHECK_ATTR(skb.cb[i] != i + 2,
82			   "ctx_out_cb",
83			   "skb->cb[i] == %d, expected %d\n",
84			   skb.cb[i], i + 2);
85	CHECK_ATTR(skb.priority != 7,
86		   "ctx_out_priority",
87		   "skb->priority == %d, expected %d\n",
88		   skb.priority, 7);
89}