374 lines
10 KiB
Python
374 lines
10 KiB
Python
"""
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Clients for dealing with bridge/interface commands.
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"""
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from core.constants import BRCTL_BIN, ETHTOOL_BIN, IP_BIN, OVS_BIN, TC_BIN
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def get_net_client(use_ovs, run):
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"""
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Retrieve desired net client for running network commands.
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:param bool use_ovs: True for OVS bridges, False for Linux bridges
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:param func run: function used to run net client commands
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:return: net client class
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"""
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if use_ovs:
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return OvsNetClient(run)
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else:
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return LinuxNetClient(run)
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class LinuxNetClient:
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"""
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Client for creating Linux bridges and ip interfaces for nodes.
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"""
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def __init__(self, run):
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"""
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Create LinuxNetClient instance.
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:param run: function to run commands with
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"""
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self.run = run
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def set_hostname(self, name):
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"""
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Set network hostname.
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:param str name: name for hostname
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:return: nothing
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"""
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self.run(f"hostname {name}")
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def create_route(self, route, device):
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"""
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Create a new route for a device.
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:param str route: route to create
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:param str device: device to add route to
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:return: nothing
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"""
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self.run(f"{IP_BIN} route add {route} dev {device}")
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def device_up(self, device):
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"""
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Bring a device up.
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:param str device: device to bring up
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:return: nothing
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"""
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self.run(f"{IP_BIN} link set {device} up")
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def device_down(self, device):
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"""
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Bring a device down.
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:param str device: device to bring down
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:return: nothing
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"""
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self.run(f"{IP_BIN} link set {device} down")
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def device_name(self, device, name):
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"""
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Set a device name.
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:param str device: device to set name for
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:param str name: name to set
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:return: nothing
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"""
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self.run(f"{IP_BIN} link set {device} name {name}")
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def device_show(self, device):
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"""
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Show information for a device.
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:param str device: device to get information for
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:return: device information
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:rtype: str
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"""
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return self.run(f"{IP_BIN} link show {device}")
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def get_mac(self, device):
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"""
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Retrieve MAC address for a given device.
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:param str device: device to get mac for
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:return: MAC address
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:rtype: str
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"""
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return self.run(f"cat /sys/class/net/{device}/address")
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def get_ifindex(self, device):
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"""
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Retrieve ifindex for a given device.
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:param str device: device to get ifindex for
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:return: ifindex
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:rtype: str
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"""
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return self.run(f"cat /sys/class/net/{device}/ifindex")
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def device_ns(self, device, namespace):
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"""
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Set netns for a device.
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:param str device: device to setns for
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:param str namespace: namespace to set device to
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:return: nothing
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"""
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self.run(f"{IP_BIN} link set {device} netns {namespace}")
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def device_flush(self, device):
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"""
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Flush device addresses.
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:param str device: device to flush
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:return: nothing
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"""
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self.run(
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f"[ -e /sys/class/net/{device} ] && {IP_BIN} -6 address flush dev {device} || true",
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shell=True,
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)
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def device_mac(self, device, mac):
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"""
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Set MAC address for a device.
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:param str device: device to set mac for
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:param str mac: mac to set
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:return: nothing
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"""
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self.run(f"{IP_BIN} link set dev {device} address {mac}")
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def delete_device(self, device):
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"""
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Delete device.
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:param str device: device to delete
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:return: nothing
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"""
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self.run(f"{IP_BIN} link delete {device}")
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def delete_tc(self, device):
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"""
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Remove traffic control settings for a device.
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:param str device: device to remove tc
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:return: nothing
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"""
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self.run(f"{TC_BIN} qdisc delete dev {device} root")
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def checksums_off(self, interface_name):
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"""
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Turns interface checksums off.
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:param str interface_name: interface to update
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:return: nothing
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"""
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self.run(f"{ETHTOOL_BIN} -K {interface_name} rx off tx off")
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def create_address(self, device, address, broadcast=None):
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"""
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Create address for a device.
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:param str device: device to add address to
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:param str address: address to add
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:param str broadcast: broadcast address to use, default is None
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:return: nothing
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"""
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if broadcast is not None:
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self.run(
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f"{IP_BIN} address add {address} broadcast {broadcast} dev {device}"
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)
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else:
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self.run(f"{IP_BIN} address add {address} dev {device}")
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def delete_address(self, device, address):
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"""
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Delete an address from a device.
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:param str device: targeted device
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:param str address: address to remove
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:return: nothing
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"""
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self.run(f"{IP_BIN} address delete {address} dev {device}")
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def create_veth(self, name, peer):
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"""
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Create a veth pair.
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:param str name: veth name
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:param str peer: peer name
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:return: nothing
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"""
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self.run(f"{IP_BIN} link add name {name} type veth peer name {peer}")
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def create_gretap(self, device, address, local, ttl, key):
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"""
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Create a GRE tap on a device.
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:param str device: device to add tap to
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:param str address: address to add tap for
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:param str local: local address to tie to
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:param int ttl: time to live value
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:param int key: key for tap
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:return: nothing
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"""
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cmd = f"{IP_BIN} link add {device} type gretap remote {address}"
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if local is not None:
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cmd += f" local {local}"
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if ttl is not None:
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cmd += f" ttl {ttl}"
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if key is not None:
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cmd += f" key {key}"
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self.run(cmd)
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def create_bridge(self, name):
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"""
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Create a Linux bridge and bring it up.
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:param str name: bridge name
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:return: nothing
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"""
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self.run(f"{BRCTL_BIN} addbr {name}")
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self.run(f"{BRCTL_BIN} stp {name} off")
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self.run(f"{BRCTL_BIN} setfd {name} 0")
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self.device_up(name)
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# turn off multicast snooping so forwarding occurs w/o IGMP joins
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snoop_file = "multicast_snooping"
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snoop = f"/sys/devices/virtual/net/{name}/bridge/{snoop_file}"
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self.run(f"echo 0 > /tmp/{snoop_file}", shell=True)
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self.run(f"cp /tmp/{snoop_file} {snoop}")
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def delete_bridge(self, name):
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"""
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Bring down and delete a Linux bridge.
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:param str name: bridge name
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:return: nothing
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"""
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self.device_down(name)
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self.run(f"{BRCTL_BIN} delbr {name}")
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def create_interface(self, bridge_name, interface_name):
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"""
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Create an interface associated with a Linux bridge.
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:param str bridge_name: bridge name
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:param str interface_name: interface name
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:return: nothing
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"""
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self.run(f"{BRCTL_BIN} addif {bridge_name} {interface_name}")
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self.device_up(interface_name)
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def delete_interface(self, bridge_name, interface_name):
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"""
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Delete an interface associated with a Linux bridge.
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:param str bridge_name: bridge name
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:param str interface_name: interface name
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:return: nothing
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"""
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self.run(f"{BRCTL_BIN} delif {bridge_name} {interface_name}")
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def existing_bridges(self, _id):
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"""
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Checks if there are any existing Linux bridges for a node.
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:param _id: node id to check bridges for
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"""
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output = self.run(f"{BRCTL_BIN} show")
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lines = output.split("\n")
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for line in lines[1:]:
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columns = line.split()
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name = columns[0]
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fields = name.split(".")
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if len(fields) != 3:
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continue
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if fields[0] == "b" and fields[1] == _id:
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return True
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return False
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def disable_mac_learning(self, name):
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"""
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Disable mac learning for a Linux bridge.
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:param str name: bridge name
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:return: nothing
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"""
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self.run(f"{BRCTL_BIN} setageing {name} 0")
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class OvsNetClient(LinuxNetClient):
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"""
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Client for creating OVS bridges and ip interfaces for nodes.
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"""
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def create_bridge(self, name):
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"""
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Create a OVS bridge and bring it up.
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:param str name: bridge name
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:return: nothing
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"""
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self.run(f"{OVS_BIN} add-br {name}")
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self.run(f"{OVS_BIN} set bridge {name} stp_enable=false")
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self.run(f"{OVS_BIN} set bridge {name} other_config:stp-max-age=6")
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self.run(f"{OVS_BIN} set bridge {name} other_config:stp-forward-delay=4")
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self.device_up(name)
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def delete_bridge(self, name):
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"""
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Bring down and delete a OVS bridge.
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:param str name: bridge name
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:return: nothing
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"""
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self.device_down(name)
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self.run(f"{OVS_BIN} del-br {name}")
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def create_interface(self, bridge_name, interface_name):
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"""
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Create an interface associated with a network bridge.
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:param str bridge_name: bridge name
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:param str interface_name: interface name
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:return: nothing
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"""
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self.run(f"{OVS_BIN} add-port {bridge_name} {interface_name}")
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self.device_up(interface_name)
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def delete_interface(self, bridge_name, interface_name):
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"""
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Delete an interface associated with a OVS bridge.
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:param str bridge_name: bridge name
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:param str interface_name: interface name
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:return: nothing
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"""
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self.run(f"{OVS_BIN} del-port {bridge_name} {interface_name}")
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def existing_bridges(self, _id):
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"""
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Checks if there are any existing OVS bridges for a node.
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:param _id: node id to check bridges for
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"""
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output = self.run(f"{OVS_BIN} list-br")
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if output:
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for line in output.split("\n"):
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fields = line.split(".")
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if fields[0] == "b" and fields[1] == _id:
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return True
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return False
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def disable_mac_learning(self, name):
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"""
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Disable mac learning for a OVS bridge.
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:param str name: bridge name
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:return: nothing
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"""
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self.run(f"{OVS_BIN} set bridge {name} other_config:mac-aging-time=0")
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