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""" Defines an Open vSwitch Datapath Flow.
"""
import re
from functools import partial
from ovs.flow.flow import Flow, Section
from ovs.flow.kv import (
KVParser,
KVDecoders,
nested_kv_decoder,
decode_nested_kv,
)
from ovs.flow.decoders import (
decode_default,
decode_time,
decode_int,
decode_mask,
Mask8,
Mask16,
Mask32,
Mask64,
Mask128,
IPMask,
EthMask,
decode_free_output,
decode_flag,
decode_nat,
)
class ODPFlow(Flow):
"""ODPFLow represents a Open vSwitch Datapath flow.
Attributes:
ufid: The UFID section with only one key-value, with keyword "ufid".
info: The info section.
match: The match section.
actions: The actions section.
id: The id object given at construction time.
"""
"""
These class variables are used to cache the KVDecoders instances. This
will speed up subsequent flow parsings.
"""
_info_decoders = None
_match_decoders = None
_action_decoders = None
@staticmethod
def info_decoders():
"""Return the KVDecoders instance to parse the info section.
Uses the cached version if available.
"""
if not ODPFlow._info_decoders:
ODPFlow._info_decoders = ODPFlow._gen_info_decoders()
return ODPFlow._info_decoders
@staticmethod
def match_decoders():
"""Return the KVDecoders instance to parse the match section.
Uses the cached version if available.
"""
if not ODPFlow._match_decoders:
ODPFlow._match_decoders = ODPFlow._gen_match_decoders()
return ODPFlow._match_decoders
@staticmethod
def action_decoders():
"""Return the KVDecoders instance to parse the actions section.
Uses the cached version if available.
"""
if not ODPFlow._action_decoders:
ODPFlow._action_decoders = ODPFlow._gen_action_decoders()
return ODPFlow._action_decoders
def __init__(self, odp_string, id=None):
"""Parse a odp flow string.
The string is expected to have the following format:
[ufid], [match] [flow data] actions:[actions]
Args:
odp_string (str): A datapath flow string.
Returns:
A ODPFlow instance.
"""
sections = []
# If UFID present, parse it and add it to it's own section.
ufid_pos = odp_string.find("ufid:")
if ufid_pos >= 0:
ufid_string = odp_string[
ufid_pos : (odp_string[ufid_pos:].find(",") + 1)
]
ufid_parser = KVParser(
ufid_string, KVDecoders({"ufid": decode_default})
)
ufid_parser.parse()
if len(ufid_parser.kv()) != 1:
raise ValueError("malformed odp flow: %s" % odp_string)
sections.append(
Section("ufid", ufid_pos, ufid_string, ufid_parser.kv())
)
action_pos = odp_string.find("actions:")
if action_pos < 0:
raise ValueError("malformed odp flow: %s" % odp_string)
# rest of the string is between ufid and actions
rest = odp_string[
(ufid_pos + len(ufid_string) if ufid_pos >= 0 else 0) : action_pos
]
action_pos += 8 # len("actions:")
actions = odp_string[action_pos:]
field_parts = rest.lstrip(" ").partition(" ")
if len(field_parts) != 3:
raise ValueError("malformed odp flow: %s" % odp_string)
match = field_parts[0]
info = field_parts[2]
iparser = KVParser(info, ODPFlow.info_decoders())
iparser.parse()
isection = Section(
name="info",
pos=odp_string.find(info),
string=info,
data=iparser.kv(),
)
sections.append(isection)
mparser = KVParser(match, ODPFlow.match_decoders())
mparser.parse()
msection = Section(
name="match",
pos=odp_string.find(match),
string=match,
data=mparser.kv(),
)
sections.append(msection)
aparser = KVParser(actions, ODPFlow.action_decoders())
aparser.parse()
asection = Section(
name="actions",
pos=action_pos,
string=actions,
data=aparser.kv(),
is_list=True,
)
sections.append(asection)
super(ODPFlow, self).__init__(sections, odp_string, id)
def __str__(self):
if self._orig:
return self._orig
else:
return self.to_string()
def to_string(self):
"""Return a text representation of the flow."""
string = "ufid: {}".format(self.ufid) if self.ufid else ""
string += "Info: {} | ".format(self.info)
string += "Match : {} | ".format(self.match)
string += "Actions: {}".format(self.actions)
return string
@staticmethod
def _gen_info_decoders():
"""Generate the info KVDecoders."""
return KVDecoders(ODPFlow._info_decoders_args())
@staticmethod
def _info_decoders_args():
"""Generate the decoder args for the info KVDecoders."""
return {
"packets": decode_int,
"bytes": decode_int,
"used": decode_time,
"flags": decode_default,
"dp": decode_default,
}
@staticmethod
def _gen_action_decoders():
"""Generate the action KVDecoders."""
return KVDecoders(
ODPFlow._action_decoders_args(), default_free=decode_free_output
)
@staticmethod
def _action_decoders_args():
"""Generate the arguments for the action KVDecoders."""
_decoders = {
"drop": decode_flag,
"lb_output": decode_int,
"trunc": decode_int,
"recirc": decode_int,
"userspace": nested_kv_decoder(
KVDecoders(
{
"pid": decode_int,
"sFlow": nested_kv_decoder(
KVDecoders(
{
"vid": decode_int,
"pcp": decode_int,
"output": decode_int,
}
)
),
"slow_path": decode_default,
"flow_sample": nested_kv_decoder(
KVDecoders(
{
"probability": decode_int,
"collector_sed_id": decode_int,
"obs_domain_id": decode_int,
"obs_point_id": decode_int,
"output_port": decode_default,
"ingress": decode_flag,
"egress": decode_flag,
}
)
),
"ipfix": nested_kv_decoder(
KVDecoders(
{
"output_port": decode_default,
}
)
),
"controller": nested_kv_decoder(
KVDecoders(
{
"reason": decode_int,
"dont_send": decode_int,
"continuation": decode_int,
"recirc_id": decode_int,
"rule_cookie": decode_int,
"controller_id": decode_int,
"max_len": decode_int,
}
)
),
"userdata": decode_default,
"actions": decode_flag,
"tunnel_out_port": decode_default,
"push_eth": nested_kv_decoder(
KVDecoders(
{
"src": EthMask,
"dst": EthMask,
"type": decode_int,
}
)
),
"pop_eth": decode_flag,
}
)
),
"set": nested_kv_decoder(
KVDecoders(ODPFlow._field_decoders_args())
),
"push_vlan": nested_kv_decoder(
KVDecoders(
{
"vid": decode_int,
"pcp": decode_int,
"cfi": decode_int,
"tpid": decode_int,
}
)
),
"pop_vlan": decode_flag,
"push_nsh": nested_kv_decoder(
KVDecoders(
{
"flags": decode_int,
"ttl": decode_int,
"mdtype": decode_int,
"np": decode_int,
"spi": decode_int,
"si": decode_int,
"c1": decode_int,
"c2": decode_int,
"c3": decode_int,
"c4": decode_int,
"md2": decode_int,
}
)
),
"pop_nsh": decode_flag,
"tnl_pop": decode_int,
"ct_clear": decode_flag,
"ct": nested_kv_decoder(
KVDecoders(
{
"commit": decode_flag,
"force_commit": decode_flag,
"zone": decode_int,
"mark": Mask32,
"label": Mask128,
"helper": decode_default,
"timeout": decode_default,
"nat": decode_nat,
}
)
),
**ODPFlow._tnl_action_decoder_args(),
}
_decoders["clone"] = nested_kv_decoder(
KVDecoders(decoders=_decoders, default_free=decode_free_output)
)
return {
**_decoders,
"sample": nested_kv_decoder(
KVDecoders(
{
"sample": (lambda x: float(x.strip("%"))),
"actions": nested_kv_decoder(
KVDecoders(
decoders=_decoders,
default_free=decode_free_output,
)
),
}
)
),
"check_pkt_len": nested_kv_decoder(
KVDecoders(
{
"size": decode_int,
"gt": nested_kv_decoder(
KVDecoders(
decoders=_decoders,
default_free=decode_free_output,
)
),
"le": nested_kv_decoder(
KVDecoders(
decoders=_decoders,
default_free=decode_free_output,
)
),
}
)
),
}
@staticmethod
def _tnl_action_decoder_args():
"""Generate the decoder arguments for the tunnel actions."""
return {
"tnl_push": nested_kv_decoder(
KVDecoders(
{
"tnl_port": decode_default,
"header": nested_kv_decoder(
KVDecoders(
{
"size": decode_int,
"type": decode_int,
"eth": nested_kv_decoder(
KVDecoders(
{
"src": EthMask,
"dst": EthMask,
"dl_type": decode_int,
}
)
),
"ipv4": nested_kv_decoder(
KVDecoders(
{
"src": IPMask,
"dst": IPMask,
"proto": decode_int,
"tos": decode_int,
"ttl": decode_int,
"frag": decode_int,
}
)
),
"ipv6": nested_kv_decoder(
KVDecoders(
{
"src": IPMask,
"dst": IPMask,
"label": decode_int,
"proto": decode_int,
"tclass": decode_int,
"hlimit": decode_int,
}
)
),
"udp": nested_kv_decoder(
KVDecoders(
{
"src": decode_int,
"dst": decode_int,
"dsum": Mask16,
}
)
),
"vxlan": nested_kv_decoder(
KVDecoders(
{
"flags": decode_int,
"vni": decode_int,
}
)
),
"geneve": nested_kv_decoder(
KVDecoders(
{
"oam": decode_flag,
"crit": decode_flag,
"vni": decode_int,
"options": partial(
decode_geneve, False
),
}
)
),
"gre": decode_tnl_gre,
"erspan": nested_kv_decoder(
KVDecoders(
{
"ver": decode_int,
"sid": decode_int,
"idx": decode_int,
"dir": decode_int,
"hwid": decode_int,
}
)
),
"gtpu": nested_kv_decoder(
KVDecoders(
{
"flags": decode_int,
"msgtype": decode_int,
"teid": decode_int,
}
)
),
}
)
),
"out_port": decode_default,
}
)
)
}
@staticmethod
def _gen_match_decoders():
"""Generate the match KVDecoders."""
return KVDecoders(ODPFlow._match_decoders_args())
@staticmethod
def _match_decoders_args():
"""Generate the arguments for the match KVDecoders."""
return {
**ODPFlow._field_decoders_args(),
"encap": nested_kv_decoder(
KVDecoders(ODPFlow._field_decoders_args())
),
}
@staticmethod
def _field_decoders_args():
"""Generate the decoder arguments for the match fields."""
return {
"skb_priority": Mask32,
"skb_mark": Mask32,
"recirc_id": decode_int,
"dp_hash": Mask32,
"ct_state": decode_default,
"ct_zone": Mask16,
"ct_mark": Mask32,
"ct_label": Mask128,
"ct_tuple4": nested_kv_decoder(
KVDecoders(
{
"src": IPMask,
"dst": IPMask,
"proto": Mask8,
"tcp_src": Mask16,
"tcp_dst": Mask16,
}
)
),
"ct_tuple6": nested_kv_decoder(
KVDecoders(
{
"src": IPMask,
"dst": IPMask,
"proto": Mask8,
"tcp_src": Mask16,
"tcp_dst": Mask16,
}
)
),
"tunnel": nested_kv_decoder(
KVDecoders(
{
"tun_id": Mask64,
"src": IPMask,
"dst": IPMask,
"ipv6_src": IPMask,
"ipv6_dst": IPMask,
"tos": Mask8,
"ttl": Mask8,
"tp_src": Mask16,
"tp_dst": Mask16,
"erspan": nested_kv_decoder(
KVDecoders(
{
"ver": Mask8,
"idx": Mask32,
"sid": decode_int,
"dir": Mask8,
"hwid": Mask8,
}
)
),
"vxlan": nested_kv_decoder(
KVDecoders(
{
"gbp": nested_kv_decoder(
KVDecoders(
{
"id": Mask16,
"flags": Mask8,
}
)
)
}
)
),
"geneve": partial(decode_geneve, True),
"gtpu": nested_kv_decoder(
KVDecoders(
{
"flags": Mask8,
"msgtype": Mask8,
}
)
),
"flags": decode_default,
}
)
),
"in_port": decode_default,
"eth": nested_kv_decoder(
KVDecoders(
{
"src": EthMask,
"dst": EthMask,
}
)
),
"vlan": nested_kv_decoder(
KVDecoders(
{
"vid": Mask16,
"pcp": Mask16,
"cfi": Mask16,
}
)
),
"eth_type": Mask16,
"mpls": nested_kv_decoder(
KVDecoders(
{
"label": Mask32,
"tc": Mask32,
"ttl": Mask32,
"bos": Mask32,
}
)
),
"ipv4": nested_kv_decoder(
KVDecoders(
{
"src": IPMask,
"dst": IPMask,
"proto": Mask8,
"tos": Mask8,
"ttl": Mask8,
"frag": decode_default,
}
)
),
"ipv6": nested_kv_decoder(
KVDecoders(
{
"src": IPMask,
"dst": IPMask,
"label": decode_mask(20),
"proto": Mask8,
"tclass": Mask8,
"hlimit": Mask8,
"frag": decode_default,
}
)
),
"tcp": nested_kv_decoder(
KVDecoders(
{
"src": Mask16,
"dst": Mask16,
}
)
),
"tcp_flags": decode_default,
"udp": nested_kv_decoder(
KVDecoders(
{
"src": Mask16,
"dst": Mask16,
}
)
),
"sctp": nested_kv_decoder(
KVDecoders(
{
"src": Mask16,
"dst": Mask16,
}
)
),
"icmp": nested_kv_decoder(
KVDecoders(
{
"type": Mask8,
"code": Mask8,
}
)
),
"icmpv6": nested_kv_decoder(
KVDecoders(
{
"type": Mask8,
"code": Mask8,
}
)
),
"arp": nested_kv_decoder(
KVDecoders(
{
"sip": IPMask,
"tip": IPMask,
"op": Mask16,
"sha": EthMask,
"tha": EthMask,
}
)
),
"nd": nested_kv_decoder(
KVDecoders(
{
"target": IPMask,
"sll": EthMask,
"tll": EthMask,
}
)
),
"nd_ext": nested_kv_decoder(
KVDecoders(
{
"nd_reserved": Mask32,
"nd_options_type": Mask8,
}
)
),
"packet_type": nested_kv_decoder(
KVDecoders(
{
"ns": Mask16,
"id": Mask16,
}
)
),
"nsh": nested_kv_decoder(
KVDecoders(
{
"flags": Mask8,
"mdtype": Mask8,
"np": Mask8,
"spi": Mask32,
"si": Mask8,
"c1": Mask32,
"c2": Mask32,
"c3": Mask32,
"c4": Mask32,
}
)
),
}
def decode_geneve(mask, value):
"""Decode geneve options.
Used for both tnl_push(header(geneve(options()))) action and
tunnel(geneve()) match.
It has the following format:
{class=0xffff,type=0x80,len=4,0xa}
Args:
mask (bool): Whether masking is supported.
value (str): The value to decode.
"""
if mask:
decoders = {
"class": Mask16,
"type": Mask8,
"len": Mask8,
}
def free_decoder(value):
return "data", Mask128(value)
else:
decoders = {
"class": decode_int,
"type": decode_int,
"len": decode_int,
}
def free_decoder(value):
return "data", decode_int(value)
result = []
for opts in re.findall(r"{.*?}", value):
result.append(
decode_nested_kv(
KVDecoders(decoders=decoders, default_free=free_decoder),
opts.strip("{}"),
)
)
return result
def decode_tnl_gre(value):
"""
Decode tnl_push(header(gre())) action.
It has the following format:
gre((flags=0x2000,proto=0x6558),key=0x1e241))
Args:
value (str): The value to decode.
"""
return decode_nested_kv(
KVDecoders(
{
"flags": decode_int,
"proto": decode_int,
"key": decode_int,
"csum": decode_int,
"seq": decode_int,
}
),
value.replace("(", "").replace(")", ""),
)