10     HDR_LEN = 4  # sizeof(struct nlattr)
12     def __init__(self, nla_type, data):  argument
20         self._data = data
28         return len(self._data) + 4
45     def _validate(data):  argument
46         if len(data) < 4:
48         nla_len, nla_type = struct.unpack("@HH", data[:4])
49         if nla_len > len(data):
51         if nla_len < 4:
55     def _parse(cls, data):  argument
56         nla_len, nla_type = struct.unpack("@HH", data[:4])
57         return cls(nla_type, data[4:])
60     def from_bytes(cls, data, attr_type_enum=None):  argument
61         cls._validate(data)
62         attr = cls._parse(data)
66     def _to_bytes(self, data: bytes):
67         ret = data
69             ret = data + bytes(align4(len(ret)) - len(ret))
70         return struct.pack("@HH", len(data) + 4, self._nla_type) + ret
93         return align4(len(b"".join([bytes(nla) for nla in self.nla_list]))) + 4
126     def _validate(data):  argument
127         assert len(data) == 8
128         nla_len, nla_type = struct.unpack("@HH", data[:4])
132     def _parse(cls, data):  argument
133         nla_len, nla_type, val = struct.unpack("@HHI", data)
153     def _validate(data):  argument
154         assert len(data) == 8
155         nla_len, nla_type = struct.unpack("@HH", data[:4])
159     def _parse(cls, data):  argument
160         nla_len, nla_type, val = struct.unpack("@HHi", data)
180     def _validate(data):  argument
181         assert len(data) == 6
182         nla_len, nla_type = struct.unpack("@HH", data[:4])
186     def _parse(cls, data):  argument
187         nla_len, nla_type, val = struct.unpack("@HHH", data)
207     def _validate(data):  argument
208         assert len(data) == 5
209         nla_len, nla_type = struct.unpack("@HH", data[:4])
213     def _parse(cls, data):  argument
214         nla_len, nla_type, val = struct.unpack("@HHB", data)
231     def _validate(data):  argument
232         nla_len, nla_type = struct.unpack("@HH", data[:4])
233         data_len = nla_len - 4
234         if data_len != 4 and data_len != 16:
247         return align4(len(self._data)) + 4
250     def _parse(cls, data):  argument
251         nla_len, nla_type = struct.unpack("@HH", data[:4])
252         data_len = len(data) - 4
253         if data_len == 4:
254             addr = socket.inet_ntop(socket.AF_INET, data[4:8])
256             addr = socket.inet_ntop(socket.AF_INET6, data[4:20])
284     def _validate(data):  argument
285         NlAttr._validate(data)
287             data[4:].decode("utf-8")
289             raise ValueError("wrong utf-8 string: {}".format(e))
296     def _parse(cls, data):  argument
297         text = data[4:-1].decode("utf-8")
298         nla_len, nla_type = struct.unpack("@HH", data[:4])
302         return self._to_bytes(bytes(self.text, encoding="utf-8") + bytes(1))
314     def _validate(data):  argument
315         NlAttr._validate(data)
317             data[4:].decode("utf-8")
319             raise ValueError("wrong utf-8 string: {}".format(e))
323         return len(self.text) + 4
326     def _parse(cls, data):  argument
327         text = data[4:].decode("utf-8")
328         nla_len, nla_type = struct.unpack("@HH", data[:4])
332         return self._to_bytes(bytes(self.text, encoding="utf-8"))