Commit 32280eca authored by Kirill Smelkov's avatar Kirill Smelkov

Merge remote-tracking branch 'kirr/x/lte-multiru' into x/lte-multiru

* kirr/x/lte-multiru:
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parents f3635492 2823bf93
#!/usr/bin/env python
"""XXX doc"""
"""Program tapsplit brings tap interface into state with several children
interfaces each covering part of original interface address space.
Usage: tapsplit <interface> <nchildren>
"""
import netifaces
import netaddr
from socket import AF_INET6
from math import log2, ceil
from os.path import exists
import sys
import subprocess
......@@ -14,10 +17,10 @@ import subprocess
def main():
tap = sys.argv[1]
n = int(sys.argv[2])
assert n > 0, n
assert n >= 0, n
# determine tap's address, network and owner
owner = readfile(sysnet(tap, 'owner')) .strip()
owner = readfile(sysnet(tap) + '/owner') .strip()
addr = None
net = None
prefixlen = None
......@@ -46,18 +49,22 @@ def main():
print('%s: split %s by %d' % (tap, net, n))
# cleanup existing children
for ifname in netifaces.interfaces():
if ifname.startswith('%s-' % tap):
run('ip', 'link', 'del', ifname)
# see how much prefix bits we need to take to divide by n
n += 1 # also leaving first range for the original tap
ptake = ceil(log2(n))
# do the split
for i, subnet in enumerate(net.subnet(prefixlen + ptake)):
if i == 0:
print('preserve %s' % subnet)
continue # leave this range for original tap
subtap = '%s-%d' % (tap, i)
print('-> %s %s' % (subtap, subnet))
if exists(sysnet(subtap)):
run('ip', 'link', 'del', subtap)
run('ip', 'tuntap', 'add', 'dev', subtap, 'mode', 'tap', 'user', owner)
run('ip', 'link', 'set', subtap, 'up')
run('ip', 'addr', 'add', str(subnet), 'dev', subtap, 'noprefixroute')
......@@ -66,11 +73,8 @@ def main():
# sysnet returns path on /sys corresponding to given interface.
def sysnet(ifname, subpath=None):
path = '/sys/devices/virtual/net/%s' % ifname
if subpath is not None:
path += '/'+subpath
return path
def sysnet(ifname):
return '/sys/devices/virtual/net/%s' % ifname
def run(*argv):
print(' # %s' % ' '.join(argv))
......
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