344 lines
13 KiB
Python
344 lines
13 KiB
Python
"""
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The functions in this file interact with the VPP API to retrieve certain
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interface metadata. Its base class will never change state. See the
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derived classes VPPApiDumper() and VPPApiApplier()
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"""
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from vpp_papi import VPPApiClient
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import os
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import fnmatch
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import logging
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class VPPApi:
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def __init__(self, address="/run/vpp/api.sock", clientname="vppcfg"):
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self.logger = logging.getLogger("vppcfg.vppapi")
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self.logger.addHandler(logging.NullHandler())
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self.address = address
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self.connected = False
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self.clientname = clientname
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self.vpp = None
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self.cache = self.cache_clear()
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self.cache_read = False
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self.lcp_enabled = False
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def connect(self):
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if self.connected:
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return True
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vpp_json_dir = "/usr/share/vpp/api/"
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## vpp_json_dir = "/home/pim/src/vpp/build-root/build-vpp_debug-native/vpp/CMakeFiles/"
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# construct a list of all the json api files
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jsonfiles = []
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for root, dirnames, filenames in os.walk(vpp_json_dir):
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for filename in fnmatch.filter(filenames, "*.api.json"):
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jsonfiles.append(os.path.join(root, filename))
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if not jsonfiles:
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self.logger.error("no json api files found")
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return False
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self.vpp = VPPApiClient(apifiles=jsonfiles, server_address=self.address)
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try:
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self.logger.debug("Connecting to VPP")
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self.vpp.connect(self.clientname)
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except:
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return False
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v = self.vpp.api.show_version()
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self.logger.info(f"VPP version is {v.version}")
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self.connected = True
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return True
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def disconnect(self):
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if not self.connected:
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return True
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self.vpp.disconnect()
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self.logger.debug("Disconnected from VPP")
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self.connected = False
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return True
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def cache_clear(self):
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self.cache_read = False
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return {
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"lcps": {},
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"interface_names": {},
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"interfaces": {},
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"interface_addresses": {},
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"bondethernets": {},
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"bondethernet_members": {},
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"bridgedomains": {},
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"vxlan_tunnels": {},
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"l2xcs": {},
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"taps": {},
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}
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def cache_remove_lcp(self, lcpname):
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"""Removes the LCP and TAP interface, identified by lcpname, from the config."""
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found = False
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for idx, lcp in self.cache["lcps"].items():
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if lcp.host_if_name == lcpname:
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found = True
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break
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if not found:
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self.logger.warning(
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f"Trying to remove an LCP which is not in the config: {lcpname}"
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)
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return False
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ifname = self.cache["interfaces"][lcp.host_sw_if_index].interface_name
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del self.cache["lcps"][lcp.phy_sw_if_index]
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# Remove the TAP interface and its dependencies
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return self.cache_remove_interface(ifname)
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def cache_remove_bondethernet_member(self, ifname):
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"""Removes the bonderthernet member interface, identified by name, from the config."""
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if not ifname in self.cache["interface_names"]:
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self.logger.warning(
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f"Trying to remove a bondethernet member interface which is not in the config: {ifname}"
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)
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return False
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iface = self.cache["interface_names"][ifname]
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for bond_idx, members in self.cache["bondethernet_members"].items():
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if iface.sw_if_index in members:
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self.cache["bondethernet_members"][bond_idx].remove(iface.sw_if_index)
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return True
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def cache_remove_l2xc(self, ifname):
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if not ifname in self.cache["interface_names"]:
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self.logger.warning(
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f"Trying to remove an L2XC which is not in the config: {ifname}"
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)
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return False
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iface = self.cache["interface_names"][ifname]
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self.cache["l2xcs"].pop(iface.sw_if_index, None)
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return True
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def cache_remove_vxlan_tunnel(self, ifname):
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if not ifname in self.cache["interface_names"]:
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self.logger.warning(
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f"Trying to remove a VXLAN Tunnel which is not in the config: {ifname}"
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)
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return False
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iface = self.cache["interface_names"][ifname]
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self.cache["vxlan_tunnels"].pop(iface.sw_if_index, None)
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return True
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def cache_remove_interface(self, ifname):
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"""Removes the interface, identified by name, from the config."""
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if not ifname in self.cache["interface_names"]:
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self.logger.warning(
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f"Trying to remove an interface which is not in the config: {ifname}"
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)
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return False
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iface = self.cache["interface_names"][ifname]
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del self.cache["interfaces"][iface.sw_if_index]
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if len(self.cache["interface_addresses"][iface.sw_if_index]) > 0:
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self.logger.warning(f"Not all addresses were removed on {ifname}")
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del self.cache["interface_addresses"][iface.sw_if_index]
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del self.cache["interface_names"][ifname]
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## Use my_dict.pop('key', None), as it allows 'key' to be absent
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if iface.sw_if_index in self.cache["bondethernet_members"]:
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if len(self.cache["bondethernet_members"][iface.sw_if_index]) != 0:
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self.logger.warning(
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f"When removing BondEthernet {ifname}, its members are not empty: {self.cache['bondethernet_members'][iface.sw_if_index]}"
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)
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else:
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del self.cache["bondethernet_members"][iface.sw_if_index]
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self.cache["bondethernets"].pop(iface.sw_if_index, None)
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self.cache["taps"].pop(iface.sw_if_index, None)
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return True
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def readconfig(self):
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if not self.connected and not self.connect():
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self.logger.error("Could not connect to VPP")
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return False
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self.cache_read = False
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## Workaround LCPng and linux-cp, in order.
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self.lcp_enabled = False
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try:
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self.logger.debug("Retrieving LCPs")
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r = self.vpp.api.lcp_itf_pair_get()
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if isinstance(r, tuple) and r[0].retval == 0:
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for lcp in r[1]:
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if lcp.phy_sw_if_index > 65535 or lcp.host_sw_if_index > 65535:
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## Work around endianness bug: https://gerrit.fd.io/r/c/vpp/+/35479
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## TODO(pim) - remove this when 22.06 ships
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lcp = lcp._replace(
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phy_sw_if_index=socket.ntohl(lcp.phy_sw_if_index)
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)
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lcp = lcp._replace(
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host_sw_if_index=socket.ntohl(lcp.host_sw_if_index)
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)
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lcp = lcp._replace(vif_index=socket.ntohl(lcp.vif_index))
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self.logger.warning(
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f"LCP workaround for endianness issue on {lcp.host_if_name}"
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)
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self.cache["lcps"][lcp.phy_sw_if_index] = lcp
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self.lcp_enabled = True
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except:
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self.logger.warning(
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"linux-cp not found, will not reconcile Linux Control Plane"
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)
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self.logger.debug("Retrieving interfaces")
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r = self.vpp.api.sw_interface_dump()
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for iface in r:
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self.cache["interfaces"][iface.sw_if_index] = iface
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self.cache["interface_names"][iface.interface_name] = iface
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self.cache["interface_addresses"][iface.sw_if_index] = []
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self.logger.debug(f"Retrieving IPv4 addresses for {iface.interface_name}")
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ipr = self.vpp.api.ip_address_dump(
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sw_if_index=iface.sw_if_index, is_ipv6=False
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)
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for ip in ipr:
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self.cache["interface_addresses"][iface.sw_if_index].append(
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str(ip.prefix)
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)
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self.logger.debug(f"Retrieving IPv6 addresses for {iface.interface_name}")
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ipr = self.vpp.api.ip_address_dump(
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sw_if_index=iface.sw_if_index, is_ipv6=True
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)
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for ip in ipr:
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self.cache["interface_addresses"][iface.sw_if_index].append(
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str(ip.prefix)
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)
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self.logger.debug("Retrieving bondethernets")
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r = self.vpp.api.sw_bond_interface_dump()
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for iface in r:
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self.cache["bondethernets"][iface.sw_if_index] = iface
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self.cache["bondethernet_members"][iface.sw_if_index] = []
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for member in self.vpp.api.sw_member_interface_dump(
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sw_if_index=iface.sw_if_index
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):
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self.cache["bondethernet_members"][iface.sw_if_index].append(
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member.sw_if_index
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)
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self.logger.debug("Retrieving bridgedomains")
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r = self.vpp.api.bridge_domain_dump()
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for bridge in r:
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self.cache["bridgedomains"][bridge.bd_id] = bridge
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self.logger.debug("Retrieving vxlan_tunnels")
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r = self.vpp.api.vxlan_tunnel_v2_dump()
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for vxlan in r:
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self.cache["vxlan_tunnels"][vxlan.sw_if_index] = vxlan
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self.logger.debug("Retrieving L2 Cross Connects")
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r = self.vpp.api.l2_xconnect_dump()
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for l2xc in r:
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self.cache["l2xcs"][l2xc.rx_sw_if_index] = l2xc
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self.logger.debug("Retrieving TAPs")
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r = self.vpp.api.sw_interface_tap_v2_dump()
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for tap in r:
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self.cache["taps"][tap.sw_if_index] = tap
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self.cache_read = True
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return self.cache_read
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def phys_exist(self, ifname_list):
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"""Return True if all interfaces in the `ifname_list` exist as physical interface names
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in VPP. Return False otherwise."""
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ret = True
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for ifname in ifname_list:
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if not ifname in self.cache["interface_names"]:
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self.logger.warning(f"Interface {ifname} does not exist in VPP")
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ret = False
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return ret
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def get_sub_interfaces(self):
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subints = [
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self.cache["interfaces"][x].interface_name
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for x in self.cache["interfaces"]
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if self.cache["interfaces"][x].sub_id > 0
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and self.cache["interfaces"][x].sub_number_of_tags > 0
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]
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return subints
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def get_qinx_interfaces(self):
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qinx_subints = [
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self.cache["interfaces"][x].interface_name
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for x in self.cache["interfaces"]
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if self.cache["interfaces"][x].sub_id > 0
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and self.cache["interfaces"][x].sub_inner_vlan_id > 0
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]
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return qinx_subints
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def get_dot1x_interfaces(self):
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dot1x_subints = [
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self.cache["interfaces"][x].interface_name
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for x in self.cache["interfaces"]
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if self.cache["interfaces"][x].sub_id > 0
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and self.cache["interfaces"][x].sub_inner_vlan_id == 0
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]
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return dot1x_subints
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def get_loopbacks(self):
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loopbacks = [
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self.cache["interfaces"][x].interface_name
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for x in self.cache["interfaces"]
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if self.cache["interfaces"][x].interface_dev_type == "Loopback"
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]
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return loopbacks
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def get_phys(self):
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phys = [
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self.cache["interfaces"][x].interface_name
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for x in self.cache["interfaces"]
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if self.cache["interfaces"][x].sw_if_index
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== self.cache["interfaces"][x].sup_sw_if_index
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and self.cache["interfaces"][x].interface_dev_type
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not in ["virtio", "BVI", "Loopback", "VXLAN", "local", "bond"]
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]
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return phys
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def get_bondethernets(self):
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bonds = [
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self.cache["bondethernets"][x].interface_name
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for x in self.cache["bondethernets"]
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]
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return bonds
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def get_vxlan_tunnels(self):
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vxlan_tunnels = [
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self.cache["interfaces"][x].interface_name
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for x in self.cache["interfaces"]
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if self.cache["interfaces"][x].interface_dev_type in ["VXLAN"]
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]
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return vxlan_tunnels
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def get_lcp_by_interface(self, sw_if_index):
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for idx, lcp in self.cache["lcps"].items():
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if lcp.phy_sw_if_index == sw_if_index:
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return lcp
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return None
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def tap_is_lcp(self, tap_ifname):
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"""Returns True if the given tap_ifname is a TAP interface belonging to an LCP,
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or False otherwise."""
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if not tap_ifname in self.cache["interface_names"]:
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return False
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vpp_iface = self.cache["interface_names"][tap_ifname]
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if not vpp_iface.interface_dev_type == "virtio":
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return False
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for idx, lcp in self.cache["lcps"].items():
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if vpp_iface.sw_if_index == lcp.host_sw_if_index:
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return True
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return False
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