1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include <network_helpers.h>
4
test_skb_ctx(void)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 struct bpf_prog_test_run_attr 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;
33 int i;
34
35 err = bpf_prog_test_load("./test_skb_ctx.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
36 &tattr.prog_fd);
37 if (CHECK_ATTR(err, "load", "err %d errno %d\n", err, errno))
38 return;
39
40 /* ctx_in != NULL, ctx_size_in == 0 */
41
42 tattr.ctx_size_in = 0;
43 err = bpf_prog_test_run_xattr(&tattr);
44 CHECK_ATTR(err == 0, "ctx_size_in", "err %d errno %d\n", err, errno);
45 tattr.ctx_size_in = sizeof(skb);
46
47 /* ctx_out != NULL, ctx_size_out == 0 */
48
49 tattr.ctx_size_out = 0;
50 err = bpf_prog_test_run_xattr(&tattr);
51 CHECK_ATTR(err == 0, "ctx_size_out", "err %d errno %d\n", err, errno);
52 tattr.ctx_size_out = sizeof(skb);
53
54 /* non-zero [len, tc_index] fields should be rejected*/
55
56 skb.len = 1;
57 err = bpf_prog_test_run_xattr(&tattr);
58 CHECK_ATTR(err == 0, "len", "err %d errno %d\n", err, errno);
59 skb.len = 0;
60
61 skb.tc_index = 1;
62 err = bpf_prog_test_run_xattr(&tattr);
63 CHECK_ATTR(err == 0, "tc_index", "err %d errno %d\n", err, errno);
64 skb.tc_index = 0;
65
66 /* non-zero [hash, sk] fields should be rejected */
67
68 skb.hash = 1;
69 err = bpf_prog_test_run_xattr(&tattr);
70 CHECK_ATTR(err == 0, "hash", "err %d errno %d\n", err, errno);
71 skb.hash = 0;
72
73 skb.sk = (struct bpf_sock *)1;
74 err = bpf_prog_test_run_xattr(&tattr);
75 CHECK_ATTR(err == 0, "sk", "err %d errno %d\n", err, errno);
76 skb.sk = 0;
77
78 err = bpf_prog_test_run_xattr(&tattr);
79 CHECK_ATTR(err != 0 || tattr.retval,
80 "run",
81 "err %d errno %d retval %d\n",
82 err, errno, tattr.retval);
83
84 CHECK_ATTR(tattr.ctx_size_out != sizeof(skb),
85 "ctx_size_out",
86 "incorrect output size, want %zu have %u\n",
87 sizeof(skb), tattr.ctx_size_out);
88
89 for (i = 0; i < 5; i++)
90 CHECK_ATTR(skb.cb[i] != i + 2,
91 "ctx_out_cb",
92 "skb->cb[i] == %d, expected %d\n",
93 skb.cb[i], i + 2);
94 CHECK_ATTR(skb.priority != 7,
95 "ctx_out_priority",
96 "skb->priority == %d, expected %d\n",
97 skb.priority, 7);
98 CHECK_ATTR(skb.ifindex != 1,
99 "ctx_out_ifindex",
100 "skb->ifindex == %d, expected %d\n",
101 skb.ifindex, 1);
102 CHECK_ATTR(skb.ingress_ifindex != 11,
103 "ctx_out_ingress_ifindex",
104 "skb->ingress_ifindex == %d, expected %d\n",
105 skb.ingress_ifindex, 11);
106 CHECK_ATTR(skb.tstamp != 8,
107 "ctx_out_tstamp",
108 "skb->tstamp == %lld, expected %d\n",
109 skb.tstamp, 8);
110 CHECK_ATTR(skb.mark != 10,
111 "ctx_out_mark",
112 "skb->mark == %u, expected %d\n",
113 skb.mark, 10);
114
115 bpf_object__close(obj);
116 }
117