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([103.167.140.11]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2ea81b0e2fasm1616926a91.52.2024.11.18.06.33.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Nov 2024 06:33:46 -0800 (PST) From: Xiao Liang To: netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Kuniyuki Iwashima , Jakub Kicinski , Donald Hunter Cc: "David S. Miller" , David Ahern , Eric Dumazet , Paolo Abeni , Ido Schimmel , Andrew Lunn , Simon Horman , Shuah Khan , Jiri Pirko , Hangbin Liu , linux-rdma@vger.kernel.org, linux-can@vger.kernel.org, osmocom-net-gprs@lists.osmocom.org, bpf@vger.kernel.org, linux-ppp@vger.kernel.org, wireguard@lists.zx2c4.com, linux-wireless@vger.kernel.org, b.a.t.m.a.n@lists.open-mesh.org, bridge@lists.linux.dev, linux-wpan@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v4 4/5] selftests: net: Add python context manager for netns entering Date: Mon, 18 Nov 2024 22:32:43 +0800 Message-ID: <20241118143244.1773-5-shaw.leon@gmail.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241118143244.1773-1-shaw.leon@gmail.com> References: <20241118143244.1773-1-shaw.leon@gmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Change netns of current thread and switch back on context exit. For example: with NetNSEnter("ns1"): ip("link add dummy0 type dummy") The command be executed in netns "ns1". Signed-off-by: Xiao Liang --- tools/testing/selftests/net/lib/py/__init__.py | 2 +- tools/testing/selftests/net/lib/py/netns.py | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/net/lib/py/__init__.py b/tools/testing/selftests/net/lib/py/__init__.py index 54d8f5eba810..e2d6c7b63019 100644 --- a/tools/testing/selftests/net/lib/py/__init__.py +++ b/tools/testing/selftests/net/lib/py/__init__.py @@ -2,7 +2,7 @@ from .consts import KSRC from .ksft import * -from .netns import NetNS +from .netns import NetNS, NetNSEnter from .nsim import * from .utils import * from .ynl import NlError, YnlFamily, EthtoolFamily, NetdevFamily, RtnlFamily diff --git a/tools/testing/selftests/net/lib/py/netns.py b/tools/testing/selftests/net/lib/py/netns.py index ecff85f9074f..8e9317044eef 100644 --- a/tools/testing/selftests/net/lib/py/netns.py +++ b/tools/testing/selftests/net/lib/py/netns.py @@ -1,9 +1,12 @@ # SPDX-License-Identifier: GPL-2.0 from .utils import ip +import ctypes import random import string +libc = ctypes.cdll.LoadLibrary('libc.so.6') + class NetNS: def __init__(self, name=None): @@ -29,3 +32,18 @@ class NetNS: def __repr__(self): return f"NetNS({self.name})" + + +class NetNSEnter: + def __init__(self, ns_name): + self.ns_path = f"/run/netns/{ns_name}" + + def __enter__(self): + self.saved = open("/proc/thread-self/ns/net") + with open(self.ns_path) as ns_file: + libc.setns(ns_file.fileno(), 0) + return self + + def __exit__(self, exc_type, exc_value, traceback): + libc.setns(self.saved.fileno(), 0) + self.saved.close()