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[vsorcdistro/.git] / ryu / build / lib.linux-armv7l-2.7 / ryu / lib / packet / ethernet.py

diff --git a/ryu/build/lib.linux-armv7l-2.7/ryu/lib/packet/ethernet.py b/ryu/build/lib.linux-armv7l-2.7/ryu/lib/packet/ethernet.py
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+# Copyright (C) 2012 Nippon Telegraph and Telephone Corporation.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import struct
+from . import packet_base
+from . import vlan
+from . import mpls
+from . import ether_types as ether
+from ryu.lib import addrconv
+from ryu.lib.pack_utils import msg_pack_into
+
+
+class ethernet(packet_base.PacketBase):
+    """Ethernet header encoder/decoder class.
+
+    An instance has the following attributes at least.
+    MAC addresses are represented as a string like '08:60:6e:7f:74:e7'.
+    __init__ takes the corresponding args in this order.
+
+    ============== ==================== =====================
+    Attribute      Description          Example
+    ============== ==================== =====================
+    dst            destination address  'ff:ff:ff:ff:ff:ff'
+    src            source address       '08:60:6e:7f:74:e7'
+    ethertype      ether type           0x0800
+    ============== ==================== =====================
+    """
+
+    _PACK_STR = '!6s6sH'
+    _MIN_LEN = struct.calcsize(_PACK_STR)
+    _MIN_PAYLOAD_LEN = 46
+    _TYPE = {
+        'ascii': [
+            'src', 'dst'
+        ]
+    }
+
+    def __init__(self, dst='ff:ff:ff:ff:ff:ff', src='00:00:00:00:00:00',
+                 ethertype=ether.ETH_TYPE_IP):
+        super(ethernet, self).__init__()
+        self.dst = dst
+        self.src = src
+        self.ethertype = ethertype
+
+    @classmethod
+    def parser(cls, buf):
+        dst, src, ethertype = struct.unpack_from(cls._PACK_STR, buf)
+        return (cls(addrconv.mac.bin_to_text(dst),
+                    addrconv.mac.bin_to_text(src), ethertype),
+                ethernet.get_packet_type(ethertype),
+                buf[ethernet._MIN_LEN:])
+
+    def serialize(self, payload, prev):
+        # Append padding if the payload is less than 46 bytes long
+        pad_len = self._MIN_PAYLOAD_LEN - len(payload)
+        if pad_len > 0:
+            payload.extend(b'\x00' * pad_len)
+
+        return struct.pack(ethernet._PACK_STR,
+                           addrconv.mac.text_to_bin(self.dst),
+                           addrconv.mac.text_to_bin(self.src),
+                           self.ethertype)
+
+    @classmethod
+    def get_packet_type(cls, type_):
+        """Override method for the ethernet IEEE802.3 Length/Type
+        field (self.ethertype).
+
+        If the value of Length/Type field is less than or equal to
+        1500 decimal(05DC hexadecimal), it means Length interpretation
+        and be passed to the LLC sublayer."""
+        if type_ <= ether.ETH_TYPE_IEEE802_3:
+            type_ = ether.ETH_TYPE_IEEE802_3
+        return cls._TYPES.get(type_)
+
+
+# copy vlan _TYPES
+ethernet._TYPES = vlan.vlan._TYPES
+ethernet.register_packet_type(vlan.vlan, ether.ETH_TYPE_8021Q)
+ethernet.register_packet_type(vlan.svlan, ether.ETH_TYPE_8021AD)
+ethernet.register_packet_type(mpls.mpls, ether.ETH_TYPE_MPLS)