def makeTunnel(self,
node1,
node2,
intfname1,
intfname2,
addr1=None,
addr2=None):
"Make a tunnel across switches on different servers"
# We should never try to create a tunnel to ourselves!
assert node1.server != 'localhost' or node2.server != 'localhost'
# And we can't ssh into this server remotely as 'localhost',
# so try again swappping node1 and node2
if node2.server == 'localhost':
return self.makeTunnel(node2, node1, intfname2, intfname1, addr2,
addr1)
# 1. Create tap interfaces
for node in node1, node2:
# For now we are hard-wiring tap9, which we will rename
node.rcmd('ip link delete tap9', stderr=PIPE)
cmd = 'ip tuntap add dev tap9 mode tap user ' + node.user
node.rcmd(cmd)
links = node.rcmd('ip link show')
# print 'after add, links =', links
assert 'tap9' in links
# 2. Create ssh tunnel between tap interfaces
# -n: close stdin
dest = '%s@%s' % (node2.user, node2.serverIP)
cmd = [
'ssh', '-n', '-o', 'Tunnel=Ethernet', '-w', '9:9', dest, 'echo @'
]
self.cmd = cmd
tunnel = node1.rpopen(cmd, sudo=False)
# When we receive the character '@', it means that our
# tunnel should be set up
debug('Waiting for tunnel to come up...\n')
ch = tunnel.stdout.read(1)
if ch != '@':
error('makeTunnel:\n', 'Tunnel setup failed for',
'%s:%s' % (node1, node1.dest), 'to',
'%s:%s\n' % (node2, node2.dest), 'command was:', cmd, '\n')
tunnel.terminate()
tunnel.wait()
error(ch + tunnel.stdout.read())
error(tunnel.stderr.read())
exit(1)
# 3. Move interfaces if necessary
for node in node1, node2:
if node.inNamespace:
retry(3, .01, RemoteLink.moveIntf, 'tap9', node)
# 4. Rename tap interfaces to desired names
for node, intf, addr in ((node1, intfname1, addr1), (node2, intfname2,
addr2)):
if not addr:
node.cmd('ip link set tap9 name', intf)
else:
node.cmd('ip link set tap9 name', intf, 'address', addr)
for node, intf in ((node1, intfname1), (node2, intfname2)):
assert intf in node.cmd('ip link show')
return tunnel
def makeTunnel( self, node1, node2, intfname1, intfname2,
addr1=None, addr2=None ):
"Make a tunnel across switches on different servers"
# We should never try to create a tunnel to ourselves!
assert node1.server != 'localhost' or node2.server != 'localhost'
# And we can't ssh into this server remotely as 'localhost',
# so try again swappping node1 and node2
if node2.server == 'localhost':
return self.makeTunnel( node2, node1, intfname2, intfname1,
addr2, addr1 )
# 1. Create tap interfaces
for node in node1, node2:
# For now we are hard-wiring tap9, which we will rename
node.rcmd( 'ip link delete tap9', stderr=PIPE )
cmd = 'ip tuntap add dev tap9 mode tap user ' + node.user
node.rcmd( cmd )
links = node.rcmd( 'ip link show' )
# print 'after add, links =', links
assert 'tap9' in links
# 2. Create ssh tunnel between tap interfaces
# -n: close stdin
dest = '%s@%s' % ( node2.user, node2.serverIP )
cmd = [ 'ssh', '-n', '-o', 'Tunnel=Ethernet', '-w', '9:9',
dest, 'echo @' ]
self.cmd = cmd
tunnel = node1.rpopen( cmd, sudo=False )
# When we receive the character '@', it means that our
# tunnel should be set up
debug( 'Waiting for tunnel to come up...\n' )
ch = tunnel.stdout.read( 1 )
if ch != '@':
error( 'makeTunnel:\n',
'Tunnel setup failed for',
'%s:%s' % ( node1, node1.dest ), 'to',
'%s:%s\n' % ( node2, node2.dest ),
'command was:', cmd, '\n' )
tunnel.terminate()
tunnel.wait()
error( ch + tunnel.stdout.read() )
error( tunnel.stderr.read() )
sys.exit( 1 )
# 3. Move interfaces if necessary
for node in node1, node2:
if node.inNamespace:
retry( 3, .01, RemoteLink.moveIntf, 'tap9', node )
# 4. Rename tap interfaces to desired names
for node, intf, addr in ( ( node1, intfname1, addr1 ),
( node2, intfname2, addr2 ) ):
if not addr:
node.cmd( 'ip link set tap9 name', intf )
else:
node.cmd( 'ip link set tap9 name', intf, 'address', addr )
for node, intf in ( ( node1, intfname1 ), ( node2, intfname2 ) ):
assert intf in node.cmd( 'ip link show' )
return tunnel
def moveIntf(intf, dstNode, printError=True,
retries=3, delaySecs=0.001):
"""Move interface to node, retrying on failure.
intf: string, interface
dstNode: destination Node
printError: if true, print error"""
from mn_wifi.node import AP
if not isinstance(dstNode, AP):
retry(retries, delaySecs, moveIntfNoRetry, intf, dstNode,
printError=printError)
def moveIntf(intf, dstNode, printError=True, retries=3, delaySecs=0.001):
"""Move interface to node, retrying on failure.
intf: string, interface
dstNode: destination Node
printError: if true, print error"""
from mn_wifi.node import AP
if not isinstance(dstNode, AP):
retry(retries,
delaySecs,
moveIntfNoRetry,
intf,
dstNode,
printError=printError)
def cleanup( self ):
"Clean up our cgroup"
retry( retries=3, delaySecs=1, fn=self.cgroupDel )
def cleanup(self):
"Clean up Node, then clean up our cgroup"
super(CPULimitedHost, self).cleanup()
retry(retries=3, delaySecs=1, fn=self.cgroupDel)
def cleanup( self ):
"Clean up Node, then clean up our cgroup"
super( CPULimitedHost, self ).cleanup()
retry( retries=3, delaySecs=1, fn=self.cgroupDel )
