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mknet
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mvp

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Trinity Pointard 2021-11-03 12:07:07 +01:00
parent 6ca16fc624
commit 610e554903
4 changed files with 114 additions and 43 deletions
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3
.gitignore vendored Normal file
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@ -0,0 +1,3 @@
.current_state.yml
__pycache__
*.swp

4
config.yml
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@ -1,10 +1,10 @@
links:
- &100
bandwidth: 100M
latency: 2ms
latency: 500us
- &1000
bandwidth: 1000M
latency: 1ms
latency: 100us
- &vdsl
bandwidth:
up: 3M

89
main.py
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@ -5,7 +5,7 @@ import shutil
import subprocess
import sys
import yaml
from pyroute2 import NDB, netns
import net
class SubnetManager:
def __init__(self, config):
@ -32,24 +32,24 @@ class SubnetManager:
class Latency:
def __init__(self, latency, offset = None):
if type(latency) is int:
self.latency_ms = latency
self.latency_us = latency
else:
for suffix, factor in [("ms", 1), ("s", 1000), ("m", 60 * 1000)]:
for suffix, factor in [("us", 1),("ms", 1000), ("s", 1000000), ("m", 60 * 1000000)]:
if latency.endswith(suffix):
self.latency_ms = int(float(latency[:-len(suffix)]) * factor)
self.latency_us = int(float(latency[:-len(suffix)]) * factor)
break
else:
self.latency_ms = int(latency)
self.latency_us = int(latency) * 1000
if offset:
self.latency_ms -= Latency(offset).latency_ms
if self.latency_ms < 0:
self.latency_ms = 0
self.latency_us -= Latency(offset).latency_us
if self.latency_us < 0:
self.latency_us = 0
def __eq__(self, o):
return isinstance(o, Latency) and o.latency_ms == self.latency_ms
return isinstance(o, Latency) and o.latency_us == self.latency_us
def __str__(self):
return f'{self.latency_ms}ms'
return f'{self.latency_us}ms'
class Bandwidth:
def __init__(self, bw):
@ -190,64 +190,53 @@ class Network:
class NamespaceManager:
def __init__(self):
self.ndb = NDB(log='debug')
self.namespaces = set()
self.prefixlen = 0
def make_namespace(self, name):
if not name in self.namespaces:
net.ns.create(name)
self.namespaces.add(name)
self.ndb.sources.add(netns=name)
def make_bridge(self, name, namespace):
def make_bridge(self, name, namespace, ports):
self.make_namespace(namespace)
return (self.ndb.interfaces.create(ifname=name, kind='bridge', target=namespace)
.set('state', 'up'))
net.create_bridge(name, namespace, ports)
def make_veth(self, name1, name2, space1, space2, ip, link):
self.make_namespace(space1)
self.make_namespace(space2)
veth = (self.ndb.interfaces.create(ifname=name1, target=space1, kind='veth',
peer={'ifname': name2, 'net_ns_fd': space2})
.set('state', 'up'))
if ip:
veth.add_ip(address=str(ip), prefixlen=self.prefixlen)
veth.commit()
#NSPopen(space1, ['tc', 'qdisc', 'add', 'dev', nam1, 'root', 'netem', 'delay', '1000ms', '0ms'])
#add the other way too
net.create_veth(name1, space1, name2, space2, ip, self.prefixlen, link)
def build_network(self, network):
self.prefixlen = network.subnet_manager.prefix
netns = "testnet-core"
bridge = self.make_bridge("br0", netns)
ports = []
for zone in network.zones.values():
if zone.is_zone():
self.build_zone(zone)
else:
self.build_server(zone)
bridge.add_port({'ifname': 'veth-' + zone.name, 'target': netns})
bridge.commit()
ports.append('veth-' + zone.name)
self.make_bridge("br0", netns, ports)
def build_zone(self, zone):
netns = "testnet-" + zone.name
bridge = self.make_bridge("br-" + zone.name, netns)
self.make_veth("veth-" + zone.name, "veth-" + zone.name, netns, "testnet-core", None, zone.link)
bridge.add_port({'ifname': 'veth-' + zone.name, 'target': netns})
ports = ['veth-' + zone.name]
for server in zone.servers.values():
self.build_server(server, zone)
bridge.add_port({'ifname': 'veth-' + server.name, 'target': netns})
bridge.commit()
ports.append('veth-' + server.name)
self.make_bridge("br-" + zone.name, netns, ports)
def build_server(self, server, zone = None):
if zone:
zone_name = "testnet-" + zone.name
namespace = zone_name + "-" + server.name
else:
zone_name = "testnet-core"
namespace = zone_name + "-" + server.name
namespace = "testnet-" + server.name + "-" + server.name
self.make_veth("veth", "veth-" + server.name, namespace, zone_name, server.ip, server.link)
def close(self):
self.ndb.close()
def parse(yaml):
server_list = yaml["servers"]
global_conf = yaml.get("global", {})
@ -269,7 +258,6 @@ def create(config_path):
network = parse(config)
nsm = NamespaceManager()
nsm.build_network(network)
nsm.close()
def run(netns, cmd):
if ":" in netns:
@ -309,12 +297,31 @@ def run(netns, cmd):
cmd = [os.getenv("SHELL") or "/bin/sh"]
os.execve("/bin/env", ["/bin/env", "ip", "netns" , "exec", name ] + cmd, env)
def runall(cmd):
with open(".current_state.yml", "r") as file:
config = yaml.safe_load(file)
zones = parse(config).zones
for zone in zones.values():
if zone.is_zone():
for server in zone.servers.values():
env = os.environ.copy()
env["ZONE"] = zone.name
env["HOST"] = server.name
env["IP"] = str(server.ip)
name = f'testnet-{zone.name}-{server.name}'
net.ns.run(name, cmd, env)
else:
env = os.environ.copy()
env["HOST"] = zone.name
env["IP"] = str(zone.ip)
name = f'testnet-{zone.name}-{zone.name}'
net.ns.run(name, cmd, env)
def destroy():
for ns in netns.listnetns():
if ns.startswith("testnet-"):
subprocess.run(f"ip netns pids {ns} | xargs -r kill", check=True, shell=True)
netns.remove(ns)
for ns in net.ns.list():
net.ns.kill(ns)
os.remove(".current_state.yml")
if __name__ == "__main__":
@ -328,10 +335,10 @@ if __name__ == "__main__":
cmd = sys.argv[1]
if cmd == "create":
create(sys.argv[2] if len(sys.argv) > 2 else "config.yml")
elif cmd == "run-all":
runall(sys.argv[2:])
elif cmd == "run":
run(sys.argv[2], sys.argv[3:])
elif cmd == "run-all":
runall(sys.argv[2:])
elif cmd == "destroy":
destroy()
else:

61
net.py Normal file
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@ -0,0 +1,61 @@
import subprocess
_netns = ["ip", "netns"]
def run_netns(*cmd):
process = subprocess.run(_netns + list(cmd), stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
if process.returncode != 0:
raise Exception(f"Failed to run command {cmd}:" + process.stderr)
return process
class ns:
def list():
process = run_netns("list")
return [ns for ns in process.stdout.split("\n") if ns.startswith("testnet-")]
def forget(name):
run_netns("del", name)
def kill(name):
pids = run_netns("pids", name).stdout.split("\n")
pids = [pid for pid in pids if pid]
if pids:
process = subprocess.run(["sudo", "kill", "-9"] + pids)
if process.returncode != 0:
raise Exception("Failed to list namespaces: " + process.stderr)
ns.forget(name)
def create(name):
run_netns("add", name)
run_netns("exec", name, "ip", "link", "set", "dev", "lo", "up")
def run(name, cmd, env=None):
subprocess.Popen(_netns + ["exec", name] + cmd, env=env)
def create_bridge(name, namespace, ports=[]):
run_netns("exec", namespace, "ip", "link", "add", "name", name, "type", "bridge")
run_netns("exec", namespace, "ip", "link", "set", "dev", name, "up")
for port in ports:
run_netns("exec", namespace, "ip", "link", "set", "dev", port, "master", name)
pass
def create_veth(name1, ns1, name2, ns2, ip = None, subnet=0, link=None):
run_netns("exec", ns1, "ip", "link", "add", "name", name1, "type", "veth",
"peer", "name", name2, "netns", ns2)
if ip:
ip = f"{ip}/{subnet}"
run_netns("exec", ns1, "ip", "addr", "add", "dev", name1, ip)
run_netns("exec", ns1, "ip", "link", "set", "dev", name1, "up")
run_netns("exec", ns2, "ip", "link", "set", "dev", name2, "up")
if link:
tc(ns1, name1, link)
tc(ns2, name2, link, True)
def tc(namespace, name, link, invert=False):
options = []
if invert:
options += ["delay", str(link.latency.latency_us), str(link.jitter.latency_us)]
options += ["rate", str(link.bandwidth.down)]
else:
options += ["rate", str(link.bandwidth.up)]
run_netns("exec", namespace, "tc", "qdisc", "add", "dev", name, "root", "netem", *options)