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""" import pyparsing as pp import netaddr from functools import reduce from operator import and_, or_ from ovs.flow.decoders import ( decode_default, decode_int, Decoder, IPMask, EthMask, ) class EvaluationResult(object): """An EvaluationResult is the result of an evaluation. It contains the boolean result and the list of key-values that were evaluated. Note that since boolean operations (and, not, or) are based only on __bool__ we use bitwise alternatives (&, ||, ~). """ def __init__(self, result, *kv): self.result = result self.kv = kv if kv else list() def __and__(self, other): """Logical and operation.""" return EvaluationResult( self.result and other.result, *self.kv, *other.kv ) def __or__(self, other): """Logical or operation.""" return EvaluationResult( self.result or other.result, *self.kv, *other.kv ) def __invert__(self): """Logical not operation.""" return EvaluationResult(not self.result, *self.kv) def __bool__(self): """Boolean operation.""" return self.result def __repr__(self): return "{} [{}]".format(self.result, self.kv) class ClauseExpression(object): """ A clause expression represents a specific expression in the filter. A clause has the following form: [field] [operator] [value] Valid operators are: = (equality) != (inequality) < (arithmetic less-than) > (arithmetic more-than) ~= (__contains__) When evaluated, the clause finds what relevant part of the flow to use for evaluation, tries to translate the clause value to the relevant type and performs the clause operation. Attributes: field (str): The flow field used in the clause. operator (str): The flow operator used in the clause. value (str): The value to perform the comparison against. """ operators = {} type_decoders = { int: decode_int, netaddr.IPAddress: IPMask, netaddr.EUI: EthMask, bool: bool, } def __init__(self, tokens): self.field = tokens[0] self.value = "" self.operator = "" if len(tokens) > 1: self.operator = tokens[1] self.value = tokens[2] def __repr__(self): return "{}(field: {}, operator: {}, value: {})".format( self.__class__.__name__, self.field, self.operator, self.value ) def _find_data_in_kv(self, kv_list): """Find a KeyValue for evaluation in a list of KeyValue. Args: kv_list (list[KeyValue]): list of KeyValue to look into. Returns: If found, tuple (kv, data) where kv is the KeyValue that matched and data is the data to be used for evaluation. None if not found. """ key_parts = self.field.split(".") field = key_parts[0] kvs = [kv for kv in kv_list if kv.key == field] if not kvs: return None for kv in kvs: if kv.key == self.field: # exact match return (kv, kv.value) if len(key_parts) > 1: data = kv.value for subkey in key_parts[1:]: try: data = data.get(subkey) except Exception: data = None break if not data: break if data: return (kv, data) return None def _find_keyval_to_evaluate(self, flow): """Finds the key-value and data to use for evaluation on a flow. Args: flow(Flow): The flow where the lookup is performed. Returns: If found, tuple (kv, data) where kv is the KeyValue that matched and data is the data to be used for evaluation. None if not found. """ for section in flow.sections: data = self._find_data_in_kv(section.data) if data: return data return None def evaluate(self, flow): """Returns whether the clause is satisfied by the flow. Args: flow (Flow): the flow to evaluate. """ result = self._find_keyval_to_evaluate(flow) if not result: return EvaluationResult(False) keyval, data = result if not self.value and not self.operator: # just asserting the existance of the key return EvaluationResult(True, keyval) # Decode the value based on the type of data if isinstance(data, Decoder): decoder = data.__class__ else: decoder = self.type_decoders.get(data.__class__) or decode_default decoded_value = decoder(self.value) if self.operator == "=": return EvaluationResult(decoded_value == data, keyval) elif self.operator == "<": return EvaluationResult(data < decoded_value, keyval) elif self.operator == ">": return EvaluationResult(data > decoded_value, keyval) elif self.operator == "~=": return EvaluationResult(decoded_value in data, keyval) class BoolNot(object): def __init__(self, t): self.op, self.args = t[0] def __repr__(self): return "NOT({})".format(self.args) def evaluate(self, flow): return ~self.args.evaluate(flow) class BoolAnd(object): def __init__(self, pattern): self.args = pattern[0][0::2] def __repr__(self): return "AND({})".format(self.args) def evaluate(self, flow): return reduce(and_, [arg.evaluate(flow) for arg in self.args]) class BoolOr(object): def __init__(self, pattern): self.args = pattern[0][0::2] def evaluate(self, flow): return reduce(or_, [arg.evaluate(flow) for arg in self.args]) def __repr__(self): return "OR({})".format(self.args) class OFFilter(object): """OFFilter represents an Open vSwitch Flow Filter. It is built with a filter expression string composed of logically-separated clauses (see ClauseExpression for details on the clause syntax). Args: expr(str): String filter expression. """ w = pp.Word(pp.alphanums + "." + ":" + "_" + "/" + "-") operators = ( pp.Literal("=") | pp.Literal("~=") | pp.Literal("<") | pp.Literal(">") | pp.Literal("!=") ) clause = (w + operators + w) | w clause.setParseAction(ClauseExpression) statement = pp.infixNotation( clause, [ ("!", 1, pp.opAssoc.RIGHT, BoolNot), ("not", 1, pp.opAssoc.RIGHT, BoolNot), ("&&", 2, pp.opAssoc.LEFT, BoolAnd), ("and", 2, pp.opAssoc.LEFT, BoolAnd), ("||", 2, pp.opAssoc.LEFT, BoolOr), ("or", 2, pp.opAssoc.LEFT, BoolOr), ], ) def __init__(self, expr): self._filter = self.statement.parseString(expr) def evaluate(self, flow): """Evaluate whether the flow satisfies the filter. Args: flow(Flow): a openflow or datapath flow. Returns: An EvaluationResult with the result of the evaluation. """ return self._filter[0].evaluate(flow)