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

   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
   8static int duration;
   9
  10static 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
  35static int delete_module(const char *name, int flags)
  36{
  37        return syscall(__NR_delete_module, name, flags);
  38}
  39
  40void 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
 106cleanup:
 107        test_module_attach__destroy(skel);
 108}
 109