1// SPDX-License-Identifier: GPL-2.0
2#include <test_progs.h>
3#include <network_helpers.h>
4#include "test_xdp_context_test_run.skel.h"
5
6void test_xdp_context_error(int prog_fd, struct bpf_test_run_opts opts,
7			    __u32 data_meta, __u32 data, __u32 data_end,
8			    __u32 ingress_ifindex, __u32 rx_queue_index,
9			    __u32 egress_ifindex)
10{
11	struct xdp_md ctx = {
12		.data = data,
13		.data_end = data_end,
14		.data_meta = data_meta,
15		.ingress_ifindex = ingress_ifindex,
16		.rx_queue_index = rx_queue_index,
17		.egress_ifindex = egress_ifindex,
18	};
19	int err;
20
21	opts.ctx_in = &ctx;
22	opts.ctx_size_in = sizeof(ctx);
23	err = bpf_prog_test_run_opts(prog_fd, &opts);
24	ASSERT_EQ(errno, EINVAL, "errno-EINVAL");
25	ASSERT_ERR(err, "bpf_prog_test_run");
26}
27
28void test_xdp_context_test_run(void)
29{
30	struct test_xdp_context_test_run *skel = NULL;
31	char data[sizeof(pkt_v4) + sizeof(__u32)];
32	char bad_ctx[sizeof(struct xdp_md) + 1];
33	struct xdp_md ctx_in, ctx_out;
34	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
35			    .data_in = &data,
36			    .data_size_in = sizeof(data),
37			    .ctx_out = &ctx_out,
38			    .ctx_size_out = sizeof(ctx_out),
39			    .repeat = 1,
40		);
41	int err, prog_fd;
42
43	skel = test_xdp_context_test_run__open_and_load();
44	if (!ASSERT_OK_PTR(skel, "skel"))
45		return;
46	prog_fd = bpf_program__fd(skel->progs.xdp_context);
47
48	/* Data past the end of the kernel's struct xdp_md must be 0 */
49	bad_ctx[sizeof(bad_ctx) - 1] = 1;
50	opts.ctx_in = bad_ctx;
51	opts.ctx_size_in = sizeof(bad_ctx);
52	err = bpf_prog_test_run_opts(prog_fd, &opts);
53	ASSERT_EQ(errno, E2BIG, "extradata-errno");
54	ASSERT_ERR(err, "bpf_prog_test_run(extradata)");
55
56	*(__u32 *)data = XDP_PASS;
57	*(struct ipv4_packet *)(data + sizeof(__u32)) = pkt_v4;
58	opts.ctx_in = &ctx_in;
59	opts.ctx_size_in = sizeof(ctx_in);
60	memset(&ctx_in, 0, sizeof(ctx_in));
61	ctx_in.data_meta = 0;
62	ctx_in.data = sizeof(__u32);
63	ctx_in.data_end = ctx_in.data + sizeof(pkt_v4);
64	err = bpf_prog_test_run_opts(prog_fd, &opts);
65	ASSERT_OK(err, "bpf_prog_test_run(valid)");
66	ASSERT_EQ(opts.retval, XDP_PASS, "valid-retval");
67	ASSERT_EQ(opts.data_size_out, sizeof(pkt_v4), "valid-datasize");
68	ASSERT_EQ(opts.ctx_size_out, opts.ctx_size_in, "valid-ctxsize");
69	ASSERT_EQ(ctx_out.data_meta, 0, "valid-datameta");
70	ASSERT_EQ(ctx_out.data, 0, "valid-data");
71	ASSERT_EQ(ctx_out.data_end, sizeof(pkt_v4), "valid-dataend");
72
73	/* Meta data's size must be a multiple of 4 */
74	test_xdp_context_error(prog_fd, opts, 0, 1, sizeof(data), 0, 0, 0);
75
76	/* data_meta must reference the start of data */
77	test_xdp_context_error(prog_fd, opts, 4, sizeof(__u32), sizeof(data),
78			       0, 0, 0);
79
80	/* Meta data must be 255 bytes or smaller */
81	test_xdp_context_error(prog_fd, opts, 0, 256, sizeof(data), 0, 0, 0);
82
83	/* Total size of data must match data_end - data_meta */
84	test_xdp_context_error(prog_fd, opts, 0, sizeof(__u32),
85			       sizeof(data) - 1, 0, 0, 0);
86	test_xdp_context_error(prog_fd, opts, 0, sizeof(__u32),
87			       sizeof(data) + 1, 0, 0, 0);
88
89	/* RX queue cannot be specified without specifying an ingress */
90	test_xdp_context_error(prog_fd, opts, 0, sizeof(__u32), sizeof(data),
91			       0, 1, 0);
92
93	/* Interface 1 is always the loopback interface which always has only
94	 * one RX queue (index 0). This makes index 1 an invalid rx queue index
95	 * for interface 1.
96	 */
97	test_xdp_context_error(prog_fd, opts, 0, sizeof(__u32), sizeof(data),
98			       1, 1, 0);
99
100	/* The egress cannot be specified */
101	test_xdp_context_error(prog_fd, opts, 0, sizeof(__u32), sizeof(data),
102			       0, 0, 1);
103
104	test_xdp_context_test_run__destroy(skel);
105}
106