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}