utils: Introduce modem-netns-setup.py
Used to quickly set modem net interfaces into their own net namespace (named after modem USB ID path). The idea is that since osmo-gsm-tester ofono modem.py knowns the USB path from a modem (path yml attr), it can infer the netns from it and run a ping process inside it. Related: OS#2308 Change-Id: Iadb2df2974e132044fba1f1bc2db8b559912e4e1changes/61/11461/4
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#!/usr/bin/env python3
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# Pau Espin Pedrol <pespin@sysmocom.de>
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# MIT
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# manage netns for ofono modems
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import os
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import sys
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import subprocess
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import usb.core
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import usb.util
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from pprint import pprint
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def get_path_ids(bus, port_numbers):
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port_numbers = [str(port) for port in port_numbers]
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ports = '.'.join(port_numbers)
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return '{}-{}'.format(bus, ports)
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def get_usb_dir(bus, port_numbers):
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return '/sys/bus/usb/devices/' + get_path_ids(bus, port_numbers) + '/'
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def get_net_from_usb(bus, port_numbers):
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net_ifaces = []
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path = get_usb_dir(bus, port_numbers)
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path_ids = get_path_ids(bus, port_numbers)
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usb_interfaces = [f for f in os.listdir(path) if f.startswith(path_ids)]
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for usb_iface in usb_interfaces:
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listdir = [f for f in os.listdir(path + usb_iface) if f == ('net')]
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if listdir:
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# found a net iface
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net_ifaces += os.listdir(path + usb_iface + '/net/')
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return net_ifaces
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def move_modem_to_netns(usb_path_id, net_li):
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if len(net_li) == 0:
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print("%s: Device has no net ifaces, skipping" %(usb_path_id))
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return
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if not os.path.exists("/var/run/netns/%s" % usb_path_id):
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print("%s: Creating netns" % (usb_path_id))
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subprocess.check_call(["ip", "netns", "add", usb_path_id])
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else:
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print("%s: netns already exists" % (usb_path_id))
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for netif in net_li:
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print("%s: Moving iface %s to netns" % (usb_path_id, netif))
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subprocess.check_call(["ip", "link", "set", netif, "netns", usb_path_id])
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# iface Must be set up AFTER pdp ctx is activated, otherwise we get no DHCP response.
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#print("%s: Setting up iface %s" % (usb_path_id, netif))
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#subprocess.check_call(["ip", "netns", "exec", usb_path_id, "ip", "link", "set", "dev", netif, "up"])
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#subprocess.check_call(["ip", "netns", "exec", usb_path_id, "udhcpc", "-i", netif])
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def delete_modem_netns(usb_path_id):
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if os.path.exists("/var/run/netns/%s" % usb_path_id):
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print("%s: Deleting netns" % (usb_path_id))
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subprocess.check_call(["ip", "netns", "delete", usb_path_id])
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else:
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print("%s: netns doesn't exist" % (usb_path_id))
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def print_help():
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print("Usage: %s start|stop" % sys.argv[0])
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exit(1)
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if __name__ == '__main__':
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if len(sys.argv) != 2:
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print_help()
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USB_DEVS = [dev for dev in usb.core.find(find_all=True)]
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RESULT = {}
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for device in USB_DEVS:
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result = {}
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if not device.port_numbers:
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continue
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usb_path_id = get_path_ids(device.bus, device.port_numbers)
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net_li = get_net_from_usb(device.bus, device.port_numbers)
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if sys.argv[1] == "start":
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move_modem_to_netns(usb_path_id, net_li)
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elif sys.argv[1] == "stop":
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delete_modem_netns(usb_path_id)
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else:
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print_help()
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