1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
4 void test_skb_ctx(void)
6 struct __sk_buff skb = {
14 struct bpf_prog_test_run_attr tattr = {
16 .data_size_in = sizeof(pkt_v4),
18 .ctx_size_in = sizeof(skb),
20 .ctx_size_out = sizeof(skb),
22 struct bpf_object *obj;
26 err = bpf_prog_load("./test_skb_ctx.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
28 if (CHECK_ATTR(err, "load", "err %d errno %d\n", err, errno))
31 /* ctx_in != NULL, ctx_size_in == 0 */
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);
38 /* ctx_out != NULL, ctx_size_out == 0 */
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);
45 /* non-zero [len, tc_index] fields should be rejected*/
48 err = bpf_prog_test_run_xattr(&tattr);
49 CHECK_ATTR(err == 0, "len", "err %d errno %d\n", err, errno);
53 err = bpf_prog_test_run_xattr(&tattr);
54 CHECK_ATTR(err == 0, "tc_index", "err %d errno %d\n", err, errno);
57 /* non-zero [hash, sk] fields should be rejected */
60 err = bpf_prog_test_run_xattr(&tattr);
61 CHECK_ATTR(err == 0, "hash", "err %d errno %d\n", err, errno);
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);
69 err = bpf_prog_test_run_xattr(&tattr);
70 CHECK_ATTR(err != 0 || tattr.retval,
72 "err %d errno %d retval %d\n",
73 err, errno, tattr.retval);
75 CHECK_ATTR(tattr.ctx_size_out != sizeof(skb),
77 "incorrect output size, want %lu have %u\n",
78 sizeof(skb), tattr.ctx_size_out);
80 for (i = 0; i < 5; i++)
81 CHECK_ATTR(skb.cb[i] != i + 2,
83 "skb->cb[i] == %d, expected %d\n",
85 CHECK_ATTR(skb.priority != 7,
87 "skb->priority == %d, expected %d\n",