tools/testing/selftests/bpf/prog_tests/raw_tp_writable_test_run.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <test_progs.h>
   4 #include <linux/nbd.h>
   5 #include "bpf_util.h"
   6
   7 /* NOTE: conflict with other tests. */
   8 void serial_test_raw_tp_writable_test_run(void)
   9 {
  10         __u32 duration = 0;
  11         char error[4096];
  12
  13         const struct bpf_insn trace_program[] = {
  14                 BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0),
  15                 BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
  16                 BPF_MOV64_IMM(BPF_REG_0, 42),
  17                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_0, 0),
  18                 BPF_EXIT_INSN(),
  19         };
  20
  21         LIBBPF_OPTS(bpf_prog_load_opts, trace_opts,
  22                 .log_level = 2,
  23                 .log_buf = error,
  24                 .log_size = sizeof(error),
  25         );
  26
  27         int bpf_fd = bpf_prog_load(BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, NULL, "GPL v2",
  28                                    trace_program, ARRAY_SIZE(trace_program),
  29                                    &trace_opts);
  30         if (CHECK(bpf_fd < 0, "bpf_raw_tracepoint_writable loaded",
  31                   "failed: %d errno %d\n", bpf_fd, errno))
  32                 return;
  33
  34         const struct bpf_insn skb_program[] = {
  35                 BPF_MOV64_IMM(BPF_REG_0, 0),
  36                 BPF_EXIT_INSN(),
  37         };
  38
  39         LIBBPF_OPTS(bpf_prog_load_opts, skb_opts,
  40                 .log_buf = error,
  41                 .log_size = sizeof(error),
  42         );
  43
  44         int filter_fd = bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, NULL, "GPL v2",
  45                                       skb_program, ARRAY_SIZE(skb_program),
  46                                       &skb_opts);
  47         if (CHECK(filter_fd < 0, "test_program_loaded", "failed: %d errno %d\n",
  48                   filter_fd, errno))
  49                 goto out_bpffd;
  50
  51         int tp_fd = bpf_raw_tracepoint_open("bpf_test_finish", bpf_fd);
  52         if (CHECK(tp_fd < 0, "bpf_raw_tracepoint_writable opened",
  53                   "failed: %d errno %d\n", tp_fd, errno))
  54                 goto out_filterfd;
  55
  56         char test_skb[128] = {
  57                 0,
  58         };
  59
  60         LIBBPF_OPTS(bpf_test_run_opts, topts,
  61                 .data_in = test_skb,
  62                 .data_size_in = sizeof(test_skb),
  63                 .repeat = 1,
  64         );
  65         int err = bpf_prog_test_run_opts(filter_fd, &topts);
  66         CHECK(err != 42, "test_run",
  67               "tracepoint did not modify return value\n");
  68         CHECK(topts.retval != 0, "test_run_ret",
  69               "socket_filter did not return 0\n");
  70
  71         close(tp_fd);
  72
  73         err = bpf_prog_test_run_opts(filter_fd, &topts);
  74         CHECK(err != 0, "test_run_notrace",
  75               "test_run failed with %d errno %d\n", err, errno);
  76         CHECK(topts.retval != 0, "test_run_ret_notrace",
  77               "socket_filter did not return 0\n");
  78
  79 out_filterfd:
  80         close(filter_fd);
  81 out_bpffd:
  82         close(bpf_fd);
  83 }