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selftests/bpf: Add additional mprog query test coverage
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Add several new test cases which assert corner cases on the mprog query
mechanism, for example, around passing in a too small or a larger array
than the current count.

  ./test_progs -t tc_opts
  torvalds#252     tc_opts_after:OK
  torvalds#253     tc_opts_append:OK
  torvalds#254     tc_opts_basic:OK
  torvalds#255     tc_opts_before:OK
  torvalds#256     tc_opts_chain_classic:OK
  torvalds#257     tc_opts_chain_mixed:OK
  torvalds#258     tc_opts_delete_empty:OK
  torvalds#259     tc_opts_demixed:OK
  torvalds#260     tc_opts_detach:OK
  torvalds#261     tc_opts_detach_after:OK
  torvalds#262     tc_opts_detach_before:OK
  torvalds#263     tc_opts_dev_cleanup:OK
  torvalds#264     tc_opts_invalid:OK
  torvalds#265     tc_opts_max:OK
  torvalds#266     tc_opts_mixed:OK
  torvalds#267     tc_opts_prepend:OK
  torvalds#268     tc_opts_query:OK
  torvalds#269     tc_opts_query_attach:OK
  torvalds#270     tc_opts_replace:OK
  torvalds#271     tc_opts_revision:OK
  Summary: 20/0 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Daniel Borkmann <[email protected]>
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@borkmann
borkmann committed Oct 9, 2023
1 parent 37345b8 commit 2a95a59
Showing 1 changed file with 130 additions and 1 deletion.
131 changes: 130 additions & 1 deletion tools/testing/selftests/bpf/prog_tests/tc_opts.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2471,7 +2471,7 @@ static void test_tc_opts_query_target(int target)
__u32 fd1, fd2, fd3, fd4, id1, id2, id3, id4;
struct test_tc_link *skel;
union bpf_attr attr;
__u32 prog_ids[5];
__u32 prog_ids[10];
int err;

skel = test_tc_link__open_and_load();
Expand Down Expand Up @@ -2599,6 +2599,135 @@ static void test_tc_opts_query_target(int target)
ASSERT_EQ(attr.query.link_ids, 0, "link_ids");
ASSERT_EQ(attr.query.link_attach_flags, 0, "link_attach_flags");

/* Test 3: Query with smaller prog_ids array */
memset(&attr, 0, attr_size);
attr.query.target_ifindex = loopback;
attr.query.attach_type = target;

memset(prog_ids, 0, sizeof(prog_ids));
attr.query.prog_ids = ptr_to_u64(prog_ids);
attr.query.count = 2;

err = syscall(__NR_bpf, BPF_PROG_QUERY, &attr, attr_size);
ASSERT_EQ(err, -1, "prog_query_should_fail");
ASSERT_EQ(errno, ENOSPC, "prog_query_should_fail");

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], 0, "prog_ids[2]");
ASSERT_EQ(prog_ids[3], 0, "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");

/* Test 4: Query with larger prog_ids array */
memset(&attr, 0, attr_size);
attr.query.target_ifindex = loopback;
attr.query.attach_type = target;

memset(prog_ids, 0, sizeof(prog_ids));
attr.query.prog_ids = ptr_to_u64(prog_ids);
attr.query.count = 10;

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");

/* Test 5: Query with NULL prog_ids array but with count > 0 */
memset(&attr, 0, attr_size);
attr.query.target_ifindex = loopback;
attr.query.attach_type = target;

memset(prog_ids, 0, sizeof(prog_ids));
attr.query.count = sizeof(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(prog_ids[0], 0, "prog_ids[0]");
ASSERT_EQ(prog_ids[1], 0, "prog_ids[1]");
ASSERT_EQ(prog_ids[2], 0, "prog_ids[2]");
ASSERT_EQ(prog_ids[3], 0, "prog_ids[3]");
ASSERT_EQ(prog_ids[4], 0, "prog_ids[4]");
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");

/* Test 6: Query with non-NULL prog_ids array but with count == 0 */
memset(&attr, 0, attr_size);
attr.query.target_ifindex = loopback;
attr.query.attach_type = target;

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(prog_ids[0], 0, "prog_ids[0]");
ASSERT_EQ(prog_ids[1], 0, "prog_ids[1]");
ASSERT_EQ(prog_ids[2], 0, "prog_ids[2]");
ASSERT_EQ(prog_ids[3], 0, "prog_ids[3]");
ASSERT_EQ(prog_ids[4], 0, "prog_ids[4]");
ASSERT_EQ(attr.query.prog_ids, ptr_to_u64(prog_ids), "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");

/* Test 7: Query with invalid flags */
attr.query.attach_flags = 0;
attr.query.query_flags = 1;

err = syscall(__NR_bpf, BPF_PROG_QUERY, &attr, attr_size);
ASSERT_EQ(err, -1, "prog_query_should_fail");
ASSERT_EQ(errno, EINVAL, "prog_query_should_fail");

attr.query.attach_flags = 1;
attr.query.query_flags = 0;

err = syscall(__NR_bpf, BPF_PROG_QUERY, &attr, attr_size);
ASSERT_EQ(err, -1, "prog_query_should_fail");
ASSERT_EQ(errno, EINVAL, "prog_query_should_fail");

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