Quelle  exceptions.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <network_helpers.h>

#include "exceptions.skel.h"
#include "exceptions_ext.skel.h"
#include "exceptions_fail.skel.h"
#include "exceptions_assert.skel.h"

static char log_buf[1024 * 1024];

static void test_exceptions_failure(void)
{
 RUN_TESTS(exceptions_fail);
}

static void test_exceptions_success(void)
{
 LIBBPF_OPTS(bpf_test_run_opts, ropts,
  .data_in = &pkt_v4,
  .data_size_in = sizeof(pkt_v4),
  .repeat = 1,
 );
 struct exceptions_ext *eskel = NULL;
 struct exceptions *skel;
 int ret;

 skel = exceptions__open();
 if (!ASSERT_OK_PTR(skel, "exceptions__open"))
  return;

 ret = exceptions__load(skel);
 if (!ASSERT_OK(ret, "exceptions__load"))
  goto done;

 if (!ASSERT_OK(bpf_map_update_elem(bpf_map__fd(skel->maps.jmp_table), &(int){0},
        &(int){bpf_program__fd(skel->progs.exception_tail_call_target)}, BPF_ANY),
         "bpf_map_update_elem jmp_table"))
  goto done;

#define RUN_SUCCESS(_prog, return_val)        \
 if (!test__start_subtest(#_prog)) goto _prog##_##return_val;    \
 ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs._prog), &ropts); \
 ASSERT_OK(ret, #_prog " prog run ret");       \
 ASSERT_EQ(ropts.retval, return_val, #_prog " prog run retval");    \
 _prog##_##return_val:

 RUN_SUCCESS(exception_throw_always_1, 64);
 RUN_SUCCESS(exception_throw_always_2, 32);
 RUN_SUCCESS(exception_throw_unwind_1, 16);
 RUN_SUCCESS(exception_throw_unwind_2, 32);
 RUN_SUCCESS(exception_throw_default, 0);
 RUN_SUCCESS(exception_throw_default_value, 5);
 RUN_SUCCESS(exception_tail_call, 24);
 RUN_SUCCESS(exception_ext, 0);
 RUN_SUCCESS(exception_ext_mod_cb_runtime, 35);
 RUN_SUCCESS(exception_throw_subprog, 1);
 RUN_SUCCESS(exception_assert_nz_gfunc, 1);
 RUN_SUCCESS(exception_assert_zero_gfunc, 1);
 RUN_SUCCESS(exception_assert_neg_gfunc, 1);
 RUN_SUCCESS(exception_assert_pos_gfunc, 1);
 RUN_SUCCESS(exception_assert_negeq_gfunc, 1);
 RUN_SUCCESS(exception_assert_poseq_gfunc, 1);
 RUN_SUCCESS(exception_assert_nz_gfunc_with, 1);
 RUN_SUCCESS(exception_assert_zero_gfunc_with, 1);
 RUN_SUCCESS(exception_assert_neg_gfunc_with, 1);
 RUN_SUCCESS(exception_assert_pos_gfunc_with, 1);
 RUN_SUCCESS(exception_assert_negeq_gfunc_with, 1);
 RUN_SUCCESS(exception_assert_poseq_gfunc_with, 1);
 RUN_SUCCESS(exception_bad_assert_nz_gfunc, 0);
 RUN_SUCCESS(exception_bad_assert_zero_gfunc, 0);
 RUN_SUCCESS(exception_bad_assert_neg_gfunc, 0);
 RUN_SUCCESS(exception_bad_assert_pos_gfunc, 0);
 RUN_SUCCESS(exception_bad_assert_negeq_gfunc, 0);
 RUN_SUCCESS(exception_bad_assert_poseq_gfunc, 0);
 RUN_SUCCESS(exception_bad_assert_nz_gfunc_with, 100);
 RUN_SUCCESS(exception_bad_assert_zero_gfunc_with, 105);
 RUN_SUCCESS(exception_bad_assert_neg_gfunc_with, 200);
 RUN_SUCCESS(exception_bad_assert_pos_gfunc_with, 0);
 RUN_SUCCESS(exception_bad_assert_negeq_gfunc_with, 101);
 RUN_SUCCESS(exception_bad_assert_poseq_gfunc_with, 99);
 RUN_SUCCESS(exception_assert_range, 1);
 RUN_SUCCESS(exception_assert_range_with, 1);
 RUN_SUCCESS(exception_bad_assert_range, 0);
 RUN_SUCCESS(exception_bad_assert_range_with, 10);

#define RUN_EXT(load_ret, attach_err, expr, msg, after_link)     \
 {           \
  LIBBPF_OPTS(bpf_object_open_opts, o, .kernel_log_buf = log_buf,   \
           .kernel_log_size = sizeof(log_buf), \
           .kernel_log_level = 2);   \
  exceptions_ext__destroy(eskel);       \
  eskel = exceptions_ext__open_opts(&o);      \
  struct bpf_program *prog = NULL;      \
  struct bpf_link *link = NULL;       \
  if (!ASSERT_OK_PTR(eskel, "exceptions_ext__open"))    \
   goto done;        \
  (expr);          \
  ASSERT_OK_PTR(bpf_program__name(prog), bpf_program__name(prog));  \
  if (!ASSERT_EQ(exceptions_ext__load(eskel), load_ret,    \
          "exceptions_ext__load")) {     \
   printf("%s\n", log_buf);      \
   goto done;        \
  }          \
  if (load_ret != 0) {        \
   if (!ASSERT_OK_PTR(strstr(log_buf, msg), "strstr")) {   \
    printf("%s\n", log_buf);     \
    goto done;       \
   }         \
  }          \
  if (!load_ret && attach_err) {       \
   if (!ASSERT_ERR_PTR(link = bpf_program__attach(prog), "attach err")) \
    goto done;       \
  } else if (!load_ret) {        \
   if (!ASSERT_OK_PTR(link = bpf_program__attach(prog), "attach ok"))  \
    goto done;       \
   (void)(after_link);       \
   bpf_link__destroy(link);      \
  }          \
 }

 if (test__start_subtest("non-throwing fentry -> exception_cb"))
  RUN_EXT(-EINVAL, true, ({
   prog = eskel->progs.pfentry;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_ext_mod_cb_runtime),
           "exception_cb_mod"), "set_attach_target"))
    goto done;
  }), "FENTRY/FEXIT programs cannot attach to exception callback", 0);

 if (test__start_subtest("throwing fentry -> exception_cb"))
  RUN_EXT(-EINVAL, true, ({
   prog = eskel->progs.throwing_fentry;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_ext_mod_cb_runtime),
           "exception_cb_mod"), "set_attach_target"))
    goto done;
  }), "FENTRY/FEXIT programs cannot attach to exception callback", 0);

 if (test__start_subtest("non-throwing fexit -> exception_cb"))
  RUN_EXT(-EINVAL, true, ({
   prog = eskel->progs.pfexit;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_ext_mod_cb_runtime),
           "exception_cb_mod"), "set_attach_target"))
    goto done;
  }), "FENTRY/FEXIT programs cannot attach to exception callback", 0);

 if (test__start_subtest("throwing fexit -> exception_cb"))
  RUN_EXT(-EINVAL, true, ({
   prog = eskel->progs.throwing_fexit;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_ext_mod_cb_runtime),
           "exception_cb_mod"), "set_attach_target"))
    goto done;
  }), "FENTRY/FEXIT programs cannot attach to exception callback", 0);

 if (test__start_subtest("throwing extension (with custom cb) -> exception_cb"))
  RUN_EXT(-EINVAL, true, ({
   prog = eskel->progs.throwing_exception_cb_extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_ext_mod_cb_runtime),
           "exception_cb_mod"), "set_attach_target"))
    goto done;
  }), "Extension programs cannot attach to exception callback", 0);

 if (test__start_subtest("throwing extension -> global func in exception_cb"))
  RUN_EXT(0, false, ({
   prog = eskel->progs.throwing_exception_cb_extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_ext_mod_cb_runtime),
           "exception_cb_mod_global"), "set_attach_target"))
    goto done;
  }), "", ({ RUN_SUCCESS(exception_ext_mod_cb_runtime, 131); }));

 if (test__start_subtest("throwing extension (with custom cb) -> global func in exception_cb"))
  RUN_EXT(0, false, ({
   prog = eskel->progs.throwing_extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_ext),
           "exception_ext_global"), "set_attach_target"))
    goto done;
  }), "", ({ RUN_SUCCESS(exception_ext, 128); }));

 if (test__start_subtest("non-throwing fentry -> non-throwing subprog"))
  /* non-throwing fentry -> non-throwing subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.pfentry;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("throwing fentry -> non-throwing subprog"))
  /* throwing fentry -> non-throwing subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.throwing_fentry;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("non-throwing fentry -> throwing subprog"))
  /* non-throwing fentry -> throwing subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.pfentry;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "throwing_subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("throwing fentry -> throwing subprog"))
  /* throwing fentry -> throwing subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.throwing_fentry;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "throwing_subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("non-throwing fexit -> non-throwing subprog"))
  /* non-throwing fexit -> non-throwing subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.pfexit;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("throwing fexit -> non-throwing subprog"))
  /* throwing fexit -> non-throwing subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.throwing_fexit;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("non-throwing fexit -> throwing subprog"))
  /* non-throwing fexit -> throwing subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.pfexit;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "throwing_subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("throwing fexit -> throwing subprog"))
  /* throwing fexit -> throwing subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.throwing_fexit;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "throwing_subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 /* fmod_ret not allowed for subprog - Check so we remember to handle its
 * throwing specification compatibility with target when supported.
 */
 if (test__start_subtest("non-throwing fmod_ret -> non-throwing subprog"))
  RUN_EXT(-EINVAL, true, ({
   prog = eskel->progs.pfmod_ret;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "subprog"), "set_attach_target"))
    goto done;
  }), "can't modify return codes of BPF program", 0);

 /* fmod_ret not allowed for subprog - Check so we remember to handle its
 * throwing specification compatibility with target when supported.
 */
 if (test__start_subtest("non-throwing fmod_ret -> non-throwing global subprog"))
  RUN_EXT(-EINVAL, true, ({
   prog = eskel->progs.pfmod_ret;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "global_subprog"), "set_attach_target"))
    goto done;
  }), "can't modify return codes of BPF program", 0);

 if (test__start_subtest("non-throwing extension -> non-throwing subprog"))
  /* non-throwing extension -> non-throwing subprog : BAD (!global) */
  RUN_EXT(-EINVAL, true, ({
   prog = eskel->progs.extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "subprog"), "set_attach_target"))
    goto done;
  }), "subprog() is not a global function", 0);

 if (test__start_subtest("non-throwing extension -> throwing subprog"))
  /* non-throwing extension -> throwing subprog : BAD (!global) */
  RUN_EXT(-EINVAL, true, ({
   prog = eskel->progs.extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "throwing_subprog"), "set_attach_target"))
    goto done;
  }), "throwing_subprog() is not a global function", 0);

 if (test__start_subtest("non-throwing extension -> non-throwing subprog"))
  /* non-throwing extension -> non-throwing global subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "global_subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("non-throwing extension -> throwing global subprog"))
  /* non-throwing extension -> throwing global subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "throwing_global_subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("throwing extension -> throwing global subprog"))
  /* throwing extension -> throwing global subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.throwing_extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "throwing_global_subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("throwing extension -> non-throwing global subprog"))
  /* throwing extension -> non-throwing global subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.throwing_extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "global_subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("non-throwing extension -> main subprog"))
  /* non-throwing extension -> main subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "exception_throw_subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

 if (test__start_subtest("throwing extension -> main subprog"))
  /* throwing extension -> main subprog : OK */
  RUN_EXT(0, false, ({
   prog = eskel->progs.throwing_extension;
   bpf_program__set_autoload(prog, true);
   if (!ASSERT_OK(bpf_program__set_attach_target(prog,
           bpf_program__fd(skel->progs.exception_throw_subprog),
           "exception_throw_subprog"), "set_attach_target"))
    goto done;
  }), "", 0);

done:
 exceptions_ext__destroy(eskel);
 exceptions__destroy(skel);
}

static void test_exceptions_assertions(void)
{
 RUN_TESTS(exceptions_assert);
}

void test_exceptions(void)
{
 test_exceptions_success();
 test_exceptions_failure();
 test_exceptions_assertions();
}