LXR linux/tools/testing/selftests/bpf/prog_tests/xdp_context_test

   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 32 bytes or smaller */
  81        test_xdp_context_error(prog_fd, opts, 0, 36, 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