mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
0303294162
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 <shaw.leon@gmail.com>
Link: https://patch.msgid.link/20250219125039.18024-13-shaw.leon@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
49 lines
1.1 KiB
Python
49 lines
1.1 KiB
Python
# SPDX-License-Identifier: GPL-2.0
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from .utils import ip
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import ctypes
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import random
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import string
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libc = ctypes.cdll.LoadLibrary('libc.so.6')
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class NetNS:
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def __init__(self, name=None):
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if name:
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self.name = name
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else:
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self.name = ''.join(random.choice(string.ascii_lowercase) for _ in range(8))
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ip('netns add ' + self.name)
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def __del__(self):
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if self.name:
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ip('netns del ' + self.name)
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self.name = None
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def __enter__(self):
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return self
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def __exit__(self, ex_type, ex_value, ex_tb):
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self.__del__()
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def __str__(self):
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return self.name
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def __repr__(self):
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return f"NetNS({self.name})"
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class NetNSEnter:
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def __init__(self, ns_name):
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self.ns_path = f"/run/netns/{ns_name}"
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def __enter__(self):
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self.saved = open("/proc/thread-self/ns/net")
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with open(self.ns_path) as ns_file:
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libc.setns(ns_file.fileno(), 0)
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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libc.setns(self.saved.fileno(), 0)
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self.saved.close()
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