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: Iadb2df2974e132044fba1f1bc2db8b559912e4e1
Pau Espin 2018-10-25 14:35:28 +02:00
parent 2decdba7e5
commit e972828a01
1 changed files with 87 additions and 0 deletions

utils/modem-netns-setup.py Executable file
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#!/usr/bin/env python3
# Pau Espin Pedrol <pespin@sysmocom.de>
# manage netns for ofono modems
import os
import sys
import subprocess
import usb.core
import usb.util
from pprint import pprint
def get_path_ids(bus, port_numbers):
port_numbers = [str(port) for port in port_numbers]
ports = '.'.join(port_numbers)
return '{}-{}'.format(bus, ports)
def get_usb_dir(bus, port_numbers):
return '/sys/bus/usb/devices/' + get_path_ids(bus, port_numbers) + '/'
def get_net_from_usb(bus, port_numbers):
net_ifaces = []
path = get_usb_dir(bus, port_numbers)
path_ids = get_path_ids(bus, port_numbers)
usb_interfaces = [f for f in os.listdir(path) if f.startswith(path_ids)]
for usb_iface in usb_interfaces:
listdir = [f for f in os.listdir(path + usb_iface) if f == ('net')]
if listdir:
# found a net iface
net_ifaces += os.listdir(path + usb_iface + '/net/')
return net_ifaces
def move_modem_to_netns(usb_path_id, net_li):
if len(net_li) == 0:
print("%s: Device has no net ifaces, skipping" %(usb_path_id))
if not os.path.exists("/var/run/netns/%s" % usb_path_id):
print("%s: Creating netns" % (usb_path_id))
subprocess.check_call(["ip", "netns", "add", usb_path_id])
print("%s: netns already exists" % (usb_path_id))
for netif in net_li:
print("%s: Moving iface %s to netns" % (usb_path_id, netif))
subprocess.check_call(["ip", "link", "set", netif, "netns", usb_path_id])
# iface Must be set up AFTER pdp ctx is activated, otherwise we get no DHCP response.
#print("%s: Setting up iface %s" % (usb_path_id, netif))
#subprocess.check_call(["ip", "netns", "exec", usb_path_id, "ip", "link", "set", "dev", netif, "up"])
#subprocess.check_call(["ip", "netns", "exec", usb_path_id, "udhcpc", "-i", netif])
def delete_modem_netns(usb_path_id):
if os.path.exists("/var/run/netns/%s" % usb_path_id):
print("%s: Deleting netns" % (usb_path_id))
subprocess.check_call(["ip", "netns", "delete", usb_path_id])
print("%s: netns doesn't exist" % (usb_path_id))
def print_help():
print("Usage: %s start|stop" % sys.argv[0])
if __name__ == '__main__':
if len(sys.argv) != 2:
USB_DEVS = [dev for dev in usb.core.find(find_all=True)]
for device in USB_DEVS:
result = {}
if not device.port_numbers:
usb_path_id = get_path_ids(device.bus, device.port_numbers)
net_li = get_net_from_usb(device.bus, device.port_numbers)
if sys.argv[1] == "start":
move_modem_to_netns(usb_path_id, net_li)
elif sys.argv[1] == "stop":