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packet: udp should detect dhcp

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Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
This commit is contained in:
FUJITA Tomonori 2015-09-03 22:35:02 +09:00
parent 22387e09e4
commit e47c5bf16a
1 changed files with 8 additions and 1 deletions
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9
ryu/lib/packet/udp.py
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@ -17,6 +17,7 @@ import struct
from . import packet_base
from . import packet_utils
from . import dhcp
class udp(packet_base.PacketBase):
@ -48,12 +49,18 @@ class udp(packet_base.PacketBase):
self.total_length = total_length
self.csum = csum
@classmethod
def get_packet_type(cls, src_port, dst_port):
if (src_port == 68 and dst_port == 67) or (src_port == 67 and dst_port == 68):
return dhcp.dhcp
return None
@classmethod
def parser(cls, buf):
(src_port, dst_port, total_length, csum) = struct.unpack_from(
cls._PACK_STR, buf)
msg = cls(src_port, dst_port, total_length, csum)
return msg, None, buf[msg._MIN_LEN:total_length]
return msg, cls.get_packet_type(src_port, dst_port), buf[msg._MIN_LEN:total_length]
def serialize(self, payload, prev):
if self.total_length == 0: