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-rw-r--r--tools/testing/selftests/bpf/test_bpftool.py178
1 files changed, 178 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/test_bpftool.py b/tools/testing/selftests/bpf/test_bpftool.py
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+++ b/tools/testing/selftests/bpf/test_bpftool.py
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+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2020 SUSE LLC.
+
+import collections
+import functools
+import json
+import os
+import socket
+import subprocess
+import unittest
+
+
+# Add the source tree of bpftool and /usr/local/sbin to PATH
+cur_dir = os.path.dirname(os.path.realpath(__file__))
+bpftool_dir = os.path.abspath(os.path.join(cur_dir, "..", "..", "..", "..",
+ "tools", "bpf", "bpftool"))
+os.environ["PATH"] = bpftool_dir + ":/usr/local/sbin:" + os.environ["PATH"]
+
+
+class IfaceNotFoundError(Exception):
+ pass
+
+
+class UnprivilegedUserError(Exception):
+ pass
+
+
+def _bpftool(args, json=True):
+ _args = ["bpftool"]
+ if json:
+ _args.append("-j")
+ _args.extend(args)
+
+ return subprocess.check_output(_args)
+
+
+def bpftool(args):
+ return _bpftool(args, json=False).decode("utf-8")
+
+
+def bpftool_json(args):
+ res = _bpftool(args)
+ return json.loads(res)
+
+
+def get_default_iface():
+ for iface in socket.if_nameindex():
+ if iface[1] != "lo":
+ return iface[1]
+ raise IfaceNotFoundError("Could not find any network interface to probe")
+
+
+def default_iface(f):
+ @functools.wraps(f)
+ def wrapper(*args, **kwargs):
+ iface = get_default_iface()
+ return f(*args, iface, **kwargs)
+ return wrapper
+
+
+class TestBpftool(unittest.TestCase):
+ @classmethod
+ def setUpClass(cls):
+ if os.getuid() != 0:
+ raise UnprivilegedUserError(
+ "This test suite needs root privileges")
+
+ @default_iface
+ def test_feature_dev_json(self, iface):
+ unexpected_helpers = [
+ "bpf_probe_write_user",
+ "bpf_trace_printk",
+ ]
+ expected_keys = [
+ "syscall_config",
+ "program_types",
+ "map_types",
+ "helpers",
+ "misc",
+ ]
+
+ res = bpftool_json(["feature", "probe", "dev", iface])
+ # Check if the result has all expected keys.
+ self.assertCountEqual(res.keys(), expected_keys)
+ # Check if unexpected helpers are not included in helpers probes
+ # result.
+ for helpers in res["helpers"].values():
+ for unexpected_helper in unexpected_helpers:
+ self.assertNotIn(unexpected_helper, helpers)
+
+ def test_feature_kernel(self):
+ test_cases = [
+ bpftool_json(["feature", "probe", "kernel"]),
+ bpftool_json(["feature", "probe"]),
+ bpftool_json(["feature"]),
+ ]
+ unexpected_helpers = [
+ "bpf_probe_write_user",
+ "bpf_trace_printk",
+ ]
+ expected_keys = [
+ "syscall_config",
+ "system_config",
+ "program_types",
+ "map_types",
+ "helpers",
+ "misc",
+ ]
+
+ for tc in test_cases:
+ # Check if the result has all expected keys.
+ self.assertCountEqual(tc.keys(), expected_keys)
+ # Check if unexpected helpers are not included in helpers probes
+ # result.
+ for helpers in tc["helpers"].values():
+ for unexpected_helper in unexpected_helpers:
+ self.assertNotIn(unexpected_helper, helpers)
+
+ def test_feature_kernel_full(self):
+ test_cases = [
+ bpftool_json(["feature", "probe", "kernel", "full"]),
+ bpftool_json(["feature", "probe", "full"]),
+ ]
+ expected_helpers = [
+ "bpf_probe_write_user",
+ "bpf_trace_printk",
+ ]
+
+ for tc in test_cases:
+ # Check if expected helpers are included at least once in any
+ # helpers list for any program type. Unfortunately we cannot assume
+ # that they will be included in all program types or a specific
+ # subset of programs. It depends on the kernel version and
+ # configuration.
+ found_helpers = False
+
+ for helpers in tc["helpers"].values():
+ if all(expected_helper in helpers
+ for expected_helper in expected_helpers):
+ found_helpers = True
+ break
+
+ self.assertTrue(found_helpers)
+
+ def test_feature_kernel_full_vs_not_full(self):
+ full_res = bpftool_json(["feature", "probe", "full"])
+ not_full_res = bpftool_json(["feature", "probe"])
+ not_full_set = set()
+ full_set = set()
+
+ for helpers in full_res["helpers"].values():
+ for helper in helpers:
+ full_set.add(helper)
+
+ for helpers in not_full_res["helpers"].values():
+ for helper in helpers:
+ not_full_set.add(helper)
+
+ self.assertCountEqual(full_set - not_full_set,
+ {"bpf_probe_write_user", "bpf_trace_printk"})
+ self.assertCountEqual(not_full_set - full_set, set())
+
+ def test_feature_macros(self):
+ expected_patterns = [
+ r"/\*\*\* System call availability \*\*\*/",
+ r"#define HAVE_BPF_SYSCALL",
+ r"/\*\*\* eBPF program types \*\*\*/",
+ r"#define HAVE.*PROG_TYPE",
+ r"/\*\*\* eBPF map types \*\*\*/",
+ r"#define HAVE.*MAP_TYPE",
+ r"/\*\*\* eBPF helper functions \*\*\*/",
+ r"#define HAVE.*HELPER",
+ r"/\*\*\* eBPF misc features \*\*\*/",
+ ]
+
+ res = bpftool(["feature", "probe", "macros"])
+ for pattern in expected_patterns:
+ self.assertRegex(res, pattern)