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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2020 Facebook */
   3
   4 #include <test_progs.h>
   5 #include <stdbool.h>
   6 #include "test_module_attach.skel.h"
   7
   8 static int duration;
   9
  10 static int trigger_module_test_writable(int *val)
  11 {
  12         int fd, err;
  13         char buf[65];
  14         ssize_t rd;
  15
  16         fd = open(BPF_TESTMOD_TEST_FILE, O_RDONLY);
  17         err = -errno;
  18         if (!ASSERT_GE(fd, 0, "testmode_file_open"))
  19                 return err;
  20
  21         rd = read(fd, buf, sizeof(buf) - 1);
  22         err = -errno;
  23         if (!ASSERT_GT(rd, 0, "testmod_file_rd_val")) {
  24                 close(fd);
  25                 return err;
  26         }
  27
  28         buf[rd] = '\0';
  29         *val = strtol(buf, NULL, 0);
  30         close(fd);
  31
  32         return 0;
  33 }
  34
  35 static int delete_module(const char *name, int flags)
  36 {
  37         return syscall(__NR_delete_module, name, flags);
  38 }
  39
  40 void test_module_attach(void)
  41 {
  42         const int READ_SZ = 456;
  43         const int WRITE_SZ = 457;
  44         struct test_module_attach* skel;
  45         struct test_module_attach__bss *bss;
  46         struct bpf_link *link;
  47         int err;
  48         int writable_val = 0;
  49
  50         skel = test_module_attach__open();
  51         if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
  52                 return;
  53
  54         err = bpf_program__set_attach_target(skel->progs.handle_fentry_manual,
  55                                              0, "bpf_testmod_test_read");
  56         ASSERT_OK(err, "set_attach_target");
  57
  58         err = test_module_attach__load(skel);
  59         if (CHECK(err, "skel_load", "failed to load skeleton\n"))
  60                 return;
  61
  62         bss = skel->bss;
  63
  64         err = test_module_attach__attach(skel);
  65         if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
  66                 goto cleanup;
  67
  68         /* trigger tracepoint */
  69         ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read");
  70         ASSERT_OK(trigger_module_test_write(WRITE_SZ), "trigger_write");
  71
  72         ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");
  73         ASSERT_EQ(bss->raw_tp_bare_write_sz, WRITE_SZ, "raw_tp_bare");
  74         ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");
  75         ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");
  76         ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");
  77         ASSERT_EQ(bss->fexit_read_sz, READ_SZ, "fexit");
  78         ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");
  79         ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");
  80
  81         bss->raw_tp_writable_bare_early_ret = true;
  82         bss->raw_tp_writable_bare_out_val = 0xf1f2f3f4;
  83         ASSERT_OK(trigger_module_test_writable(&writable_val),
  84                   "trigger_writable");
  85         ASSERT_EQ(bss->raw_tp_writable_bare_in_val, 1024, "writable_test_in");
  86         ASSERT_EQ(bss->raw_tp_writable_bare_out_val, writable_val,
  87                   "writable_test_out");
  88
  89         test_module_attach__detach(skel);
  90
  91         /* attach fentry/fexit and make sure it get's module reference */
  92         link = bpf_program__attach(skel->progs.handle_fentry);
  93         if (!ASSERT_OK_PTR(link, "attach_fentry"))
  94                 goto cleanup;
  95
  96         ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
  97         bpf_link__destroy(link);
  98
  99         link = bpf_program__attach(skel->progs.handle_fexit);
 100         if (!ASSERT_OK_PTR(link, "attach_fexit"))
 101                 goto cleanup;
 102
 103         ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
 104         bpf_link__destroy(link);
 105
 106 cleanup:
 107         test_module_attach__destroy(skel);
 108 }