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selftests/bpf: Test bpf_mprog query API via libbpf and raw syscall
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Add a new test case which performs double query of the bpf_mprog through
libbpf API, but also via raw bpf(2) syscall. This is testing to gather
first the count and then in a subsequent probe the full information with
the program array without clearing passed structs in between.

  # ./vmtest.sh -- ./test_progs -t tc_opts
  [...]
  ./test_progs -t tc_opts
  [    1.398818] tsc: Refined TSC clocksource calibration: 3407.999 MHz
  [    1.400263] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fd336761, max_idle_ns: 440795243819 ns
  [    1.402734] clocksource: Switched to clocksource tsc
  [    1.426639] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.428112] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  #252     tc_opts_after:OK
  #253     tc_opts_append:OK
  #254     tc_opts_basic:OK
  #255     tc_opts_before:OK
  #256     tc_opts_chain_classic:OK
  #257     tc_opts_chain_mixed:OK
  #258     tc_opts_delete_empty:OK
  #259     tc_opts_demixed:OK
  #260     tc_opts_detach:OK
  #261     tc_opts_detach_after:OK
  #262     tc_opts_detach_before:OK
  #263     tc_opts_dev_cleanup:OK
  #264     tc_opts_invalid:OK
  #265     tc_opts_max:OK
  #266     tc_opts_mixed:OK
  #267     tc_opts_prepend:OK
  #268     tc_opts_query:OK            <--- (new test)
  #269     tc_opts_replace:OK
  #270     tc_opts_revision:OK
  Summary: 19/0 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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@borkmann
borkmann authored and Kernel Patches Daemon committed Oct 6, 2023
1 parent d732719 commit f255aca
Showing 1 changed file with 167 additions and 0 deletions.
167 changes: 167 additions & 0 deletions tools/testing/selftests/bpf/prog_tests/tc_opts.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2462,3 +2462,170 @@ void serial_test_tc_opts_max(void)
test_tc_opts_max_target(BPF_TCX_INGRESS, BPF_F_AFTER, true);
test_tc_opts_max_target(BPF_TCX_EGRESS, BPF_F_AFTER, false);
}

static void test_tc_opts_query_target(int target)
{
const size_t attr_size = offsetofend(union bpf_attr, query);
LIBBPF_OPTS(bpf_prog_attach_opts, opta);
LIBBPF_OPTS(bpf_prog_detach_opts, optd);
LIBBPF_OPTS(bpf_prog_query_opts, optq);
__u32 fd1, fd2, fd3, fd4, id1, id2, id3, id4;
struct test_tc_link *skel;
union bpf_attr attr;
__u32 prog_ids[5];
int err;

skel = test_tc_link__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_load"))
goto cleanup;

fd1 = bpf_program__fd(skel->progs.tc1);
fd2 = bpf_program__fd(skel->progs.tc2);
fd3 = bpf_program__fd(skel->progs.tc3);
fd4 = bpf_program__fd(skel->progs.tc4);

id1 = id_from_prog_fd(fd1);
id2 = id_from_prog_fd(fd2);
id3 = id_from_prog_fd(fd3);
id4 = id_from_prog_fd(fd4);

assert_mprog_count(target, 0);

LIBBPF_OPTS_RESET(opta,
.expected_revision = 1,
);

err = bpf_prog_attach_opts(fd1, loopback, target, &opta);
if (!ASSERT_EQ(err, 0, "prog_attach"))
goto cleanup;

assert_mprog_count(target, 1);

LIBBPF_OPTS_RESET(opta,
.expected_revision = 2,
);

err = bpf_prog_attach_opts(fd2, loopback, target, &opta);
if (!ASSERT_EQ(err, 0, "prog_attach"))
goto cleanup1;

assert_mprog_count(target, 2);

LIBBPF_OPTS_RESET(opta,
.expected_revision = 3,
);

err = bpf_prog_attach_opts(fd3, loopback, target, &opta);
if (!ASSERT_EQ(err, 0, "prog_attach"))
goto cleanup2;

assert_mprog_count(target, 3);

LIBBPF_OPTS_RESET(opta,
.expected_revision = 4,
);

err = bpf_prog_attach_opts(fd4, loopback, target, &opta);
if (!ASSERT_EQ(err, 0, "prog_attach"))
goto cleanup3;

assert_mprog_count(target, 4);

/* Test 1: Double query via libbpf API */
err = bpf_prog_query_opts(loopback, target, &optq);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup4;

ASSERT_EQ(optq.count, 4, "count");
ASSERT_EQ(optq.revision, 5, "revision");
ASSERT_EQ(optq.prog_ids, NULL, "prog_ids");
ASSERT_EQ(optq.link_ids, NULL, "link_ids");

memset(prog_ids, 0, sizeof(prog_ids));
optq.prog_ids = prog_ids;

err = bpf_prog_query_opts(loopback, target, &optq);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup4;

ASSERT_EQ(optq.count, 4, "count");
ASSERT_EQ(optq.revision, 5, "revision");
ASSERT_EQ(optq.prog_ids[0], id1, "prog_ids[0]");
ASSERT_EQ(optq.prog_ids[1], id2, "prog_ids[1]");
ASSERT_EQ(optq.prog_ids[2], id3, "prog_ids[2]");
ASSERT_EQ(optq.prog_ids[3], id4, "prog_ids[3]");
ASSERT_EQ(optq.prog_ids[4], 0, "prog_ids[4]");
ASSERT_EQ(optq.link_ids, NULL, "link_ids");

/* Test 2: Double query via bpf_attr & bpf(2) directly */
memset(&attr, 0, attr_size);
attr.query.target_ifindex = loopback;
attr.query.attach_type = target;

err = syscall(__NR_bpf, BPF_PROG_QUERY, &attr, attr_size);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup4;

ASSERT_EQ(attr.query.count, 4, "count");
ASSERT_EQ(attr.query.revision, 5, "revision");
ASSERT_EQ(attr.query.query_flags, 0, "query_flags");
ASSERT_EQ(attr.query.attach_flags, 0, "attach_flags");
ASSERT_EQ(attr.query.target_ifindex, loopback, "target_ifindex");
ASSERT_EQ(attr.query.attach_type, target, "attach_type");
ASSERT_EQ(attr.query.prog_ids, 0, "prog_ids");
ASSERT_EQ(attr.query.prog_attach_flags, 0, "prog_attach_flags");
ASSERT_EQ(attr.query.link_ids, 0, "link_ids");
ASSERT_EQ(attr.query.link_attach_flags, 0, "link_attach_flags");

memset(prog_ids, 0, sizeof(prog_ids));
attr.query.prog_ids = ptr_to_u64(prog_ids);

err = syscall(__NR_bpf, BPF_PROG_QUERY, &attr, attr_size);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup4;

ASSERT_EQ(attr.query.count, 4, "count");
ASSERT_EQ(attr.query.revision, 5, "revision");
ASSERT_EQ(attr.query.query_flags, 0, "query_flags");
ASSERT_EQ(attr.query.attach_flags, 0, "attach_flags");
ASSERT_EQ(attr.query.target_ifindex, loopback, "target_ifindex");
ASSERT_EQ(attr.query.attach_type, target, "attach_type");
ASSERT_EQ(attr.query.prog_ids, ptr_to_u64(prog_ids), "prog_ids");
ASSERT_EQ(prog_ids[0], id1, "prog_ids[0]");
ASSERT_EQ(prog_ids[1], id2, "prog_ids[1]");
ASSERT_EQ(prog_ids[2], id3, "prog_ids[2]");
ASSERT_EQ(prog_ids[3], id4, "prog_ids[3]");
ASSERT_EQ(prog_ids[4], 0, "prog_ids[4]");
ASSERT_EQ(attr.query.prog_attach_flags, 0, "prog_attach_flags");
ASSERT_EQ(attr.query.link_ids, 0, "link_ids");
ASSERT_EQ(attr.query.link_attach_flags, 0, "link_attach_flags");

cleanup4:
err = bpf_prog_detach_opts(fd4, loopback, target, &optd);
ASSERT_OK(err, "prog_detach");
assert_mprog_count(target, 3);

cleanup3:
err = bpf_prog_detach_opts(fd3, loopback, target, &optd);
ASSERT_OK(err, "prog_detach");
assert_mprog_count(target, 2);

cleanup2:
err = bpf_prog_detach_opts(fd2, loopback, target, &optd);
ASSERT_OK(err, "prog_detach");
assert_mprog_count(target, 1);

cleanup1:
err = bpf_prog_detach_opts(fd1, loopback, target, &optd);
ASSERT_OK(err, "prog_detach");
assert_mprog_count(target, 0);

cleanup:
test_tc_link__destroy(skel);
}

void serial_test_tc_opts_query(void)
{
test_tc_opts_query_target(BPF_TCX_INGRESS);
test_tc_opts_query_target(BPF_TCX_EGRESS);
}

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