packet lib: sctp: add a unittest for SCTP

Signed-off-by: Yuichi Ito <ito.yuichi0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 1308 insertions, 0 deletions

diff --git a/ryu/tests/unit/packet/test_sctp.py b/ryu/tests/unit/packet/test_sctp.py
new file mode 100644
index 00000000..810db669
--- /dev/null
+++ b/ryu/tests/unit/packet/test_sctp.py
@@ -0,0 +1,1308 @@
+# Copyright (C) 2013 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 inspect
+import logging
+import struct
+import unittest
+
+from nose.tools import eq_
+from ryu.lib import addrconv
+from ryu.lib.packet import sctp
+
+
+LOG = logging.getLogger(__name__)
+
+
+class Test_sctp(unittest.TestCase):
+
+    def setUp(self):
+        self.chunks = []
+        self.csum = 0
+        self.dst_port = 1234
+        self.src_port = 5678
+        self.vtag = 98765432
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf = '\x16\x2e\x04\xd2\x05\xe3\x0a\x78\x00\x00\x00\x00'
+
+    def setUp_with_data(self):
+        self.unordered = 1
+        self.begin = 1
+        self.end = 1
+        self.length = 16 + 10
+        self.tsn = 12345
+        self.sid = 1
+        self.seq = 0
+        self.payload_id = 0
+        self.payload_data = '\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a'
+
+        self.data = sctp.chunk_data(
+            self.unordered, self.begin, self.end, self.length, self.tsn,
+            self.sid, self.seq, self.payload_id, self.payload_data)
+
+        self.chunks = [self.data]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x00\x07\x00\x1a\x00\x00\x30\x39\x00\x01\x00\x00' + \
+            '\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a'
+
+    def setUp_with_init(self):
+        self.flags = 0
+        self.length = 20 + 8 + 20 + 8 + 4 + 16 + 16
+        self.init_tag = 123456
+        self.a_rwnd = 9876
+        self.os = 3
+        self.mis = 3
+        self.i_tsn = 123456
+
+        self.p_ipv4 = sctp.param_ipv4(8, '192.168.1.1')
+        self.p_ipv6 = sctp.param_ipv6(20, 'fe80::647e:1aff:fec4:8284')
+        self.p_cookie_preserve = sctp.param_cookie_preserve(8, 5000)
+        self.p_ecn = sctp.param_ecn(4, None)
+        self.p_host_addr = sctp.param_host_addr(16, 'test host\x00\x00\x00')
+        self.p_support_type = sctp.param_supported_addr(
+            16,
+            [sctp.PTYPE_IPV4, sctp.PTYPE_IPV6, sctp.PTYPE_COOKIE_PRESERVE,
+             sctp.PTYPE_ECN, sctp.PTYPE_HOST_ADDR, sctp.PTYPE_SUPPORTED_ADDR])
+
+        self.init = sctp.chunk_init(
+            self.flags, self.length, self.init_tag, self.a_rwnd,
+            self.os, self.mis, self.i_tsn,
+            [self.p_ipv4, self.p_ipv6, self.p_cookie_preserve,
+             self.p_ecn, self.p_host_addr, self.p_support_type])
+
+        self.chunks = [self.init]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x01\x00\x00\x5c\x00\x01\xe2\x40\x00\x00\x26\x94' + \
+            '\x00\x03\x00\x03\x00\x01\xe2\x40' + \
+            '\x00\x05\x00\x08\xc0\xa8\x01\x01' + \
+            '\x00\x06\x00\x14' + \
+            '\xfe\x80\x00\x00\x00\x00\x00\x00' + \
+            '\x64\x7e\x1a\xff\xfe\xc4\x82\x84' + \
+            '\x00\x09\x00\x08\x00\x00\x13\x88' + \
+            '\x80\x00\x00\x04' + \
+            '\x00\x0b\x00\x10' + \
+            '\x74\x65\x73\x74\x20\x68\x6f\x73\x74\x00\x00\x00' + \
+            '\x00\x0c\x00\x10\x00\x05\x00\x06\x00\x09\x80\x00' + \
+            '\x00\x0b\x00\x0c'
+
+    def setUp_with_init_ack(self):
+        self.flags = 0
+        self.length = 20 + 8 + 8 + 20 + 8 + 4 + 16
+        self.init_tag = 123456
+        self.a_rwnd = 9876
+        self.os = 3
+        self.mis = 3
+        self.i_tsn = 123456
+
+        self.p_state_cookie = sctp.param_state_cookie(
+            8, '\x01\x02\x03\x04')
+        self.p_ipv4 = sctp.param_ipv4(8, '192.168.1.1')
+        self.p_ipv6 = sctp.param_ipv6(20, 'fe80::647e:1aff:fec4:8284')
+        self.p_unrecognized_param = sctp.param_unrecognized_param(
+            8, '\xff\xff\x00\x04')
+        self.p_ecn = sctp.param_ecn(4, None)
+        self.p_host_addr = sctp.param_host_addr(16, 'test host\x00\x00\x00')
+
+        self.init_ack = sctp.chunk_init_ack(
+            self.flags, self.length, self.init_tag, self.a_rwnd,
+            self.os, self.mis, self.i_tsn,
+            [self.p_state_cookie, self.p_ipv4, self.p_ipv6,
+             self.p_unrecognized_param, self.p_ecn, self.p_host_addr])
+
+        self.chunks = [self.init_ack]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x02\x00\x00\x54\x00\x01\xe2\x40\x00\x00\x26\x94' + \
+            '\x00\x03\x00\x03\x00\x01\xe2\x40' + \
+            '\x00\x07\x00\x08\x01\x02\x03\x04' + \
+            '\x00\x05\x00\x08\xc0\xa8\x01\x01' + \
+            '\x00\x06\x00\x14' + \
+            '\xfe\x80\x00\x00\x00\x00\x00\x00' + \
+            '\x64\x7e\x1a\xff\xfe\xc4\x82\x84' + \
+            '\x00\x08\x00\x08\xff\xff\x00\x04' + \
+            '\x80\x00\x00\x04' + \
+            '\x00\x0b\x00\x10' + \
+            '\x74\x65\x73\x74\x20\x68\x6f\x73\x74\x00\x00\x00'
+
+    def setUp_with_sack(self):
+        self.flags = 0
+        self.length = 16 + 2 * 2 * 5 + 4 * 5
+        self.tsn_ack = 123456
+        self.a_rwnd = 9876
+        self.gapack_num = 5
+        self.duptsn_num = 5
+        self.gapacks = [[2, 3], [10, 12], [20, 24], [51, 52], [62, 63]]
+        self.duptsns = [123458, 123466, 123476, 123507, 123518]
+
+        self.sack = sctp.chunk_sack(
+            self.flags, self.length, self.tsn_ack, self.a_rwnd,
+            self.gapack_num, self.duptsn_num, self.gapacks, self.duptsns)
+
+        self.chunks = [self.sack]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x03\x00\x00\x38\x00\x01\xe2\x40' + \
+            '\x00\x00\x26\x94\x00\x05\x00\x05' + \
+            '\x00\x02\x00\x03\x00\x0a\x00\x0c\x00\x14\x00\x18' + \
+            '\x00\x33\x00\x34\x00\x3e\x00\x3f' + \
+            '\x00\x01\xe2\x42\x00\x01\xe2\x4a\x00\x01\xe2\x54' + \
+            '\x00\x01\xe2\x73\x00\x01\xe2\x7e'
+
+    def setUp_with_heartbeat(self):
+        self.flags = 0
+        self.length = 4 + 8
+
+        self.p_heartbeat = sctp.param_heartbeat(8, '\x01\x02\x03\x04')
+
+        self.heartbeat = sctp.chunk_heartbeat(
+            self.flags, self.length, self.p_heartbeat)
+
+        self.chunks = [self.heartbeat]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x04\x00\x00\x0c' + \
+            '\x00\x01\x00\x08' + \
+            '\x01\x02\x03\x04'
+
+    def setUp_with_heartbeat_ack(self):
+        self.flags = 0
+        self.length = 4 + 12
+
+        self.p_heartbeat = sctp.param_heartbeat(
+            12, '\xff\xee\xdd\xcc\xbb\xaa\x99\x88')
+
+        self.heartbeat_ack = sctp.chunk_heartbeat_ack(
+            self.flags, self.length, self.p_heartbeat)
+
+        self.chunks = [self.heartbeat_ack]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x05\x00\x00\x10' + \
+            '\x00\x01\x00\x0c' + \
+            '\xff\xee\xdd\xcc\xbb\xaa\x99\x88'
+
+    def setUp_with_abort(self):
+        self.tflag = 0
+        self.length = 4 + 8 + 16 + 8 + 4 + 20 + 8 + 4 + 8 + 8 + 4 + 12 \
+            + 20 + 20
+
+        self.c_invalid_stream_id = sctp.cause_invalid_stream_id(
+            8, 4096)
+        self.c_missing_param = sctp.cause_missing_param(
+            16, 4, [sctp.PTYPE_IPV4, sctp.PTYPE_IPV6,
+                    sctp.PTYPE_COOKIE_PRESERVE, sctp.PTYPE_HOST_ADDR])
+        self.c_stale_cookie = sctp.cause_stale_cookie(8, '\x00\x00\x13\x88')
+        self.c_out_of_resource = sctp.cause_out_of_resource(4)
+        self.c_unresolvable_addr = sctp.cause_unresolvable_addr(
+            20, sctp.param_host_addr(16, 'test host\x00\x00\x00'))
+        self.c_unrecognized_chunk = sctp.cause_unrecognized_chunk(
+            8, '\xff\x00\x00\x04')
+        self.c_invalid_param = sctp.cause_invalid_param(4)
+        self.c_unrecognized_param = sctp.cause_unrecognized_param(
+            8, '\xff\xff\x00\x04')
+        self.c_no_userdata = sctp.cause_no_userdata(8, '\x00\x01\xe2\x40')
+        self.c_cookie_while_shutdown = sctp.cause_cookie_while_shutdown(4)
+        self.c_restart_with_new_addr = sctp.cause_restart_with_new_addr(
+            12, sctp.param_ipv4(8, '192.168.1.1'))
+        self.c_user_initiated_abort = sctp.cause_user_initiated_abort(
+            20, 'Key Interrupt.\x00\x00')
+        self.c_protocol_violation = sctp.cause_protocol_violation(
+            20, 'Unknown reason.\x00')
+
+        self.causes = [
+            self.c_invalid_stream_id, self.c_missing_param,
+            self.c_stale_cookie, self.c_out_of_resource,
+            self.c_unresolvable_addr, self.c_unrecognized_chunk,
+            self.c_invalid_param, self.c_unrecognized_param,
+            self.c_no_userdata, self.c_cookie_while_shutdown,
+            self.c_restart_with_new_addr, self.c_user_initiated_abort,
+            self.c_protocol_violation]
+
+        self.abort = sctp.chunk_abort(self.tflag, self.length, self.causes)
+
+        self.chunks = [self.abort]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x06\x00\x00\x90' + \
+            '\x00\x01\x00\x08\x10\x00\x00\x00' + \
+            '\x00\x02\x00\x10\x00\x00\x00\x04' + \
+            '\x00\x05\x00\x06\x00\x09\x00\x0b' + \
+            '\x00\x03\x00\x08\x00\x00\x13\x88' + \
+            '\x00\x04\x00\x04' + \
+            '\x00\x05\x00\x14' + \
+            '\x00\x0b\x00\x10' + \
+            '\x74\x65\x73\x74\x20\x68\x6f\x73\x74\x00\x00\x00' + \
+            '\x00\x06\x00\x08\xff\x00\x00\x04' + \
+            '\x00\x07\x00\x04' + \
+            '\x00\x08\x00\x08\xff\xff\x00\x04' + \
+            '\x00\x09\x00\x08\x00\x01\xe2\x40' + \
+            '\x00\x0a\x00\x04' + \
+            '\x00\x0b\x00\x0c' + \
+            '\x00\x05\x00\x08\xc0\xa8\x01\x01' + \
+            '\x00\x0c\x00\x14' + \
+            '\x4b\x65\x79\x20\x49\x6e\x74\x65' + \
+            '\x72\x72\x75\x70\x74\x2e\x00\x00' + \
+            '\x00\x0d\x00\x14' + \
+            '\x55\x6e\x6b\x6e\x6f\x77\x6e\x20' + \
+            '\x72\x65\x61\x73\x6f\x6e\x2e\x00'
+
+    def setUp_with_shutdown(self):
+        self.flags = 0
+        self.length = 8
+        self.tsn_ack = 123456
+
+        self.shutdown = sctp.chunk_shutdown(
+            self.flags, self.length, self.tsn_ack)
+
+        self.chunks = [self.shutdown]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x07\x00\x00\x08\x00\x01\xe2\x40'
+
+    def setUp_with_shutdown_ack(self):
+        self.flags = 0
+        self.length = 4
+
+        self.shutdown_ack = sctp.chunk_shutdown_ack(
+            self.flags, self.length)
+
+        self.chunks = [self.shutdown_ack]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x08\x00\x00\x04'
+
+    def setUp_with_error(self):
+        self.flags = 0
+        self.length = 4 + 8 + 16 + 8 + 4 + 20 + 8 + 4 + 8 + 8 + 4 + 12 \
+            + 20 + 20
+
+        self.c_invalid_stream_id = sctp.cause_invalid_stream_id(
+            8, 4096)
+        self.c_missing_param = sctp.cause_missing_param(
+            16, 4, [sctp.PTYPE_IPV4, sctp.PTYPE_IPV6,
+                    sctp.PTYPE_COOKIE_PRESERVE, sctp.PTYPE_HOST_ADDR])
+        self.c_stale_cookie = sctp.cause_stale_cookie(8, '\x00\x00\x13\x88')
+        self.c_out_of_resource = sctp.cause_out_of_resource(4)
+        self.c_unresolvable_addr = sctp.cause_unresolvable_addr(
+            20, sctp.param_host_addr(16, 'test host\x00\x00\x00'))
+        self.c_unrecognized_chunk = sctp.cause_unrecognized_chunk(
+            8, '\xff\x00\x00\x04')
+        self.c_invalid_param = sctp.cause_invalid_param(4)
+        self.c_unrecognized_param = sctp.cause_unrecognized_param(
+            8, '\xff\xff\x00\x04')
+        self.c_no_userdata = sctp.cause_no_userdata(8, '\x00\x01\xe2\x40')
+        self.c_cookie_while_shutdown = sctp.cause_cookie_while_shutdown(4)
+        self.c_restart_with_new_addr = sctp.cause_restart_with_new_addr(
+            12, sctp.param_ipv4(8, '192.168.1.1'))
+        self.c_user_initiated_abort = sctp.cause_user_initiated_abort(
+            20, 'Key Interrupt.\x00\x00')
+        self.c_protocol_violation = sctp.cause_protocol_violation(
+            20, 'Unknown reason.\x00')
+
+        self.causes = [
+            self.c_invalid_stream_id, self.c_missing_param,
+            self.c_stale_cookie, self.c_out_of_resource,
+            self.c_unresolvable_addr, self.c_unrecognized_chunk,
+            self.c_invalid_param, self.c_unrecognized_param,
+            self.c_no_userdata, self.c_cookie_while_shutdown,
+            self.c_restart_with_new_addr, self.c_user_initiated_abort,
+            self.c_protocol_violation]
+
+        self.error = sctp.chunk_error(self.flags, self.length, self.causes)
+
+        self.chunks = [self.error]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x09\x00\x00\x90' + \
+            '\x00\x01\x00\x08\x10\x00\x00\x00' + \
+            '\x00\x02\x00\x10\x00\x00\x00\x04' + \
+            '\x00\x05\x00\x06\x00\x09\x00\x0b' + \
+            '\x00\x03\x00\x08\x00\x00\x13\x88' + \
+            '\x00\x04\x00\x04' + \
+            '\x00\x05\x00\x14' + \
+            '\x00\x0b\x00\x10' + \
+            '\x74\x65\x73\x74\x20\x68\x6f\x73\x74\x00\x00\x00' + \
+            '\x00\x06\x00\x08\xff\x00\x00\x04' + \
+            '\x00\x07\x00\x04' + \
+            '\x00\x08\x00\x08\xff\xff\x00\x04' + \
+            '\x00\x09\x00\x08\x00\x01\xe2\x40' + \
+            '\x00\x0a\x00\x04' + \
+            '\x00\x0b\x00\x0c' + \
+            '\x00\x05\x00\x08\xc0\xa8\x01\x01' + \
+            '\x00\x0c\x00\x14' + \
+            '\x4b\x65\x79\x20\x49\x6e\x74\x65' + \
+            '\x72\x72\x75\x70\x74\x2e\x00\x00' + \
+            '\x00\x0d\x00\x14' + \
+            '\x55\x6e\x6b\x6e\x6f\x77\x6e\x20' + \
+            '\x72\x65\x61\x73\x6f\x6e\x2e\x00'
+
+    def setUp_with_cookie_echo(self):
+        self.flags = 0
+        self.length = 8
+        self.cookie = '\x12\x34\x56\x78'
+
+        self.cookie_echo = sctp.chunk_cookie_echo(
+            self.flags, self.length, self.cookie)
+
+        self.chunks = [self.cookie_echo]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x0a\x00\x00\x08\x12\x34\x56\x78'
+
+    def setUp_with_cookie_ack(self):
+        self.flags = 0
+        self.length = 4
+
+        self.cookie_ack = sctp.chunk_cookie_ack(
+            self.flags, self.length)
+
+        self.chunks = [self.cookie_ack]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x0b\x00\x00\x04'
+
+    def setUp_with_ecn_echo(self):
+        self.flags = 0
+        self.length = 8
+        self.low_tsn = 123456
+
+        self.ecn_echo = sctp.chunk_ecn_echo(
+            self.flags, self.length, self.low_tsn)
+
+        self.chunks = [self.ecn_echo]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x0c\x00\x00\x08\x00\x01\xe2\x40'
+
+    def setUp_with_cwr(self):
+        self.flags = 0
+        self.length = 8
+        self.low_tsn = 123456
+
+        self.cwr = sctp.chunk_cwr(
+            self.flags, self.length, self.low_tsn)
+
+        self.chunks = [self.cwr]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x0d\x00\x00\x08\x00\x01\xe2\x40'
+
+    def setUp_with_shutdown_complete(self):
+        self.tflag = 0
+        self.length = 4
+
+        self.shutdown_complete = sctp.chunk_shutdown_complete(
+            self.tflag, self.length)
+
+        self.chunks = [self.shutdown_complete]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x0e\x00\x00\x04'
+
+    def setUp_with_multi_chunks(self):
+        self.s_flags = 0
+        self.s_length = 16
+        self.s_tsn_ack = 123456
+        self.s_a_rwnd = 9876
+        self.s_gapack_num = 0
+        self.s_duptsn_num = 0
+        self.s_gapacks = None
+        self.s_duptsns = None
+
+        self.sack = sctp.chunk_sack(
+            self.s_flags, self.s_length, self.s_tsn_ack, self.s_a_rwnd,
+            self.s_gapack_num, self.s_duptsn_num, self.s_gapacks,
+            self.s_duptsns)
+
+        self.d1_unordered = 0
+        self.d1_begin = 1
+        self.d1_end = 0
+        self.d1_length = 16 + 10
+        self.d1_tsn = 12345
+        self.d1_sid = 1
+        self.d1_seq = 0
+        self.d1_payload_id = 0
+        self.d1_payload_data = '\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a'
+
+        self.data1 = sctp.chunk_data(
+            self.d1_unordered, self.d1_begin, self.d1_end,
+            self.d1_length, self.d1_tsn, self.d1_sid, self.d1_seq,
+            self.d1_payload_id, self.d1_payload_data)
+
+        self.d2_unordered = 0
+        self.d2_begin = 0
+        self.d2_end = 1
+        self.d2_length = 16 + 10
+        self.d2_tsn = 12346
+        self.d2_sid = 1
+        self.d2_seq = 1
+        self.d2_payload_id = 0
+        self.d2_payload_data = '\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a'
+
+        self.data2 = sctp.chunk_data(
+            self.d2_unordered, self.d2_begin, self.d2_end,
+            self.d2_length, self.d2_tsn, self.d2_sid, self.d2_seq,
+            self.d2_payload_id, self.d2_payload_data)
+
+        self.chunks = [self.sack, self.data1, self.data2]
+
+        self.sc = sctp.sctp(
+            self.src_port, self.dst_port, self.vtag, self.csum,
+            self.chunks)
+
+        self.buf += '\x03\x00\x00\x10\x00\x01\xe2\x40' + \
+            '\x00\x00\x26\x94\x00\x00\x00\x00' + \
+            '\x00\x02\x00\x1a\x00\x00\x30\x39\x00\x01\x00\x00' + \
+            '\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a' + \
+            '\x00\x01\x00\x1a\x00\x00\x30\x3a\x00\x01\x00\x01' + \
+            '\x00\x00\x00\x00\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a'
+
+    def tearDown(self):
+        pass
+
+    def test_init(self):
+        eq_(self.src_port, self.sc.src_port)
+        eq_(self.dst_port, self.sc.dst_port)
+        eq_(self.vtag, self.sc.vtag)
+        eq_(self.csum, self.sc.csum)
+        eq_(self.chunks, self.sc.chunks)
+
+    def test_init_with_data(self):
+        self.setUp_with_data()
+        self.test_init()
+
+    def test_init_with_init(self):
+        self.setUp_with_init()
+        self.test_init()
+
+    def test_init_with_init_ack(self):
+        self.setUp_with_init_ack()
+        self.test_init()
+
+    def test_init_with_sack(self):
+        self.setUp_with_sack()
+        self.test_init()
+
+    def test_init_with_heartbeat(self):
+        self.setUp_with_heartbeat()
+        self.test_init()
+
+    def test_init_with_heartbeat_ack(self):
+        self.setUp_with_heartbeat_ack()
+        self.test_init()
+
+    def test_init_with_abort(self):
+        self.setUp_with_abort()
+        self.test_init()
+
+    def test_init_with_shutdown(self):
+        self.setUp_with_shutdown()
+        self.test_init()
+
+    def test_init_with_shutdown_ack(self):
+        self.setUp_with_shutdown_ack()
+        self.test_init()
+
+    def test_init_with_error(self):
+        self.setUp_with_error()
+        self.test_init()
+
+    def test_init_with_cookie_echo(self):
+        self.setUp_with_cookie_echo()
+        self.test_init()
+
+    def test_init_with_cookie_ack(self):
+        self.setUp_with_cookie_ack()
+        self.test_init()
+
+    def test_init_with_ecn_echo(self):
+        self.setUp_with_ecn_echo()
+        self.test_init()
+
+    def test_init_with_cwr(self):
+        self.setUp_with_cwr()
+        self.test_init()
+
+    def test_init_with_shutdown_complete(self):
+        self.setUp_with_shutdown_complete()
+        self.test_init()
+
+    def test_init_with_multi_chunks(self):
+        self.setUp_with_multi_chunks()
+        self.test_init()
+
+    def test_parser(self):
+        _res = self.sc.parser(str(self.buf))
+        if type(_res) is tuple:
+            res = _res[0]
+        else:
+            res = _res
+
+        eq_(self.src_port, res.src_port)
+        eq_(self.dst_port, res.dst_port)
+        eq_(self.vtag, res.vtag)
+        eq_(self.csum, res.csum)
+        eq_(str(self.chunks), str(res.chunks))
+
+    def test_parser_with_data(self):
+        self.setUp_with_data()
+        self.test_parser()
+
+    def test_parser_with_init(self):
+        self.setUp_with_init()
+        self.test_parser()
+
+    def test_parser_with_init_ack(self):
+        self.setUp_with_init_ack()
+        self.test_parser()
+
+    def test_parser_with_sack(self):
+        self.setUp_with_sack()
+        self.test_parser()
+
+    def test_parser_with_heartbeat(self):
+        self.setUp_with_heartbeat()
+        self.test_parser()
+
+    def test_parser_with_heartbeat_ack(self):
+        self.setUp_with_heartbeat_ack()
+        self.test_parser()
+
+    def test_parser_with_abort(self):
+        self.setUp_with_abort()
+        self.test_parser()
+
+    def test_parser_with_shutdown(self):
+        self.setUp_with_shutdown()
+        self.test_parser()
+
+    def test_parser_with_shutdown_ack(self):
+        self.setUp_with_shutdown_ack()
+        self.test_parser()
+
+    def test_parser_with_error(self):
+        self.setUp_with_error()
+        self.test_parser()
+
+    def test_parser_with_cookie_echo(self):
+        self.setUp_with_cookie_echo()
+        self.test_parser()
+
+    def test_parser_with_cookie_ack(self):
+        self.setUp_with_cookie_ack()
+        self.test_parser()
+
+    def test_parser_with_ecn_echo(self):
+        self.setUp_with_ecn_echo()
+        self.test_parser()
+
+    def test_parser_with_cwr(self):
+        self.setUp_with_cwr()
+        self.test_parser()
+
+    def test_parser_with_shutdown_complete(self):
+        self.setUp_with_shutdown_complete()
+        self.test_parser()
+
+    def test_parser_with_multi_chunks(self):
+        self.setUp_with_multi_chunks()
+        self.test_parser()
+
+    def _test_serialize(self):
+        buf = self.sc.serialize(bytearray(), None)
+        res = struct.unpack_from(sctp.sctp._PACK_STR, buf)
+        eq_(self.src_port, res[0])
+        eq_(self.dst_port, res[1])
+        eq_(self.vtag, res[2])
+        # skip compare checksum
+        #eq_(self.csum, res[3])
+
+        return buf[sctp.sctp._MIN_LEN:]
+
+    def test_serialize(self):
+        self._test_serialize()
+
+    def test_serialize_with_data(self):
+        self.setUp_with_data()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_data._PACK_STR, buf)
+        eq_(sctp.chunk_data.chunk_type(), res[0])
+        flags = (
+            (self.unordered << 2) |
+            (self.begin << 1) |
+            (self.end << 0))
+        eq_(flags, res[1])
+        eq_(self.length, res[2])
+        eq_(self.tsn, res[3])
+        eq_(self.sid, res[4])
+        eq_(self.seq, res[5])
+        eq_(self.payload_id, res[6])
+        eq_(self.payload_data, buf[sctp.chunk_data._MIN_LEN:])
+
+    def test_serialize_with_init(self):
+        self.setUp_with_init()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_init._PACK_STR, buf)
+        eq_(sctp.chunk_init.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+        eq_(self.init_tag, res[3])
+        eq_(self.a_rwnd, res[4])
+        eq_(self.os, res[5])
+        eq_(self.mis, res[6])
+        eq_(self.i_tsn, res[7])
+
+        buf = buf[sctp.chunk_init._MIN_LEN:]
+        res1 = struct.unpack_from(sctp.param_ipv4._PACK_STR, buf)
+        eq_(sctp.param_ipv4.param_type(), res1[0])
+        eq_(8, res1[1])
+        eq_('192.168.1.1', addrconv.ipv4.bin_to_text(
+            buf[sctp.param_ipv4._MIN_LEN:sctp.param_ipv4._MIN_LEN + 4]))
+
+        buf = buf[8:]
+        res2 = struct.unpack_from(sctp.param_ipv6._PACK_STR, buf)
+        eq_(sctp.param_ipv6.param_type(), res2[0])
+        eq_(20, res2[1])
+        eq_('fe80::647e:1aff:fec4:8284', addrconv.ipv6.bin_to_text(
+            buf[sctp.param_ipv6._MIN_LEN:sctp.param_ipv6._MIN_LEN + 16]))
+
+        buf = buf[20:]
+        res3 = struct.unpack_from(sctp.param_cookie_preserve._PACK_STR,
+                                  buf)
+        eq_(sctp.param_cookie_preserve.param_type(), res3[0])
+        eq_(8, res3[1])
+        eq_(5000, res3[2])
+
+        buf = buf[8:]
+        res4 = struct.unpack_from(sctp.param_ecn._PACK_STR, buf)
+        eq_(sctp.param_ecn.param_type(), res4[0])
+        eq_(4, res4[1])
+
+        buf = buf[4:]
+        res5 = struct.unpack_from(sctp.param_host_addr._PACK_STR, buf)
+        eq_(sctp.param_host_addr.param_type(), res5[0])
+        eq_(16, res5[1])
+        eq_('test host\x00\x00\x00',
+            buf[sctp.param_host_addr._MIN_LEN:
+                sctp.param_host_addr._MIN_LEN + 12])
+
+        buf = buf[16:]
+        res6 = struct.unpack_from(sctp.param_supported_addr._PACK_STR, buf)
+        res6 = list(res6)
+        eq_(sctp.param_supported_addr.param_type(), res6[0])
+        eq_(16, res6[1])
+        buf = buf[sctp.param_supported_addr._MIN_LEN:]
+        offset = 0
+        tmplist = []
+        while offset < len(buf):
+            (tmp, ) = struct.unpack_from('!H', buf, offset)
+            tmplist.append(tmp)
+            offset += struct.calcsize('!H')
+        res6.extend(tmplist)
+        eq_(sctp.PTYPE_IPV4, res6[2])
+        eq_(sctp.PTYPE_IPV6, res6[3])
+        eq_(sctp.PTYPE_COOKIE_PRESERVE, res6[4])
+        eq_(sctp.PTYPE_ECN, res6[5])
+        eq_(sctp.PTYPE_HOST_ADDR, res6[6])
+        eq_(sctp.PTYPE_SUPPORTED_ADDR, res6[7])
+
+    def test_serialize_with_init_ack(self):
+        self.setUp_with_init_ack()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_init_ack._PACK_STR, buf)
+        eq_(sctp.chunk_init_ack.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+        eq_(self.init_tag, res[3])
+        eq_(self.a_rwnd, res[4])
+        eq_(self.os, res[5])
+        eq_(self.mis, res[6])
+        eq_(self.i_tsn, res[7])
+
+        buf = buf[sctp.chunk_init_ack._MIN_LEN:]
+        res1 = struct.unpack_from(sctp.param_state_cookie._PACK_STR, buf)
+        eq_(sctp.param_state_cookie.param_type(), res1[0])
+        eq_(8, res1[1])
+        eq_('\x01\x02\x03\x04',
+            buf[sctp.param_state_cookie._MIN_LEN:
+                sctp.param_state_cookie._MIN_LEN + 4])
+
+        buf = buf[8:]
+        res2 = struct.unpack_from(sctp.param_ipv4._PACK_STR, buf)
+        eq_(sctp.param_ipv4.param_type(), res2[0])
+        eq_(8, res2[1])
+        eq_('192.168.1.1', addrconv.ipv4.bin_to_text(
+            buf[sctp.param_ipv4._MIN_LEN:sctp.param_ipv4._MIN_LEN + 4]))
+
+        buf = buf[8:]
+        res3 = struct.unpack_from(sctp.param_ipv6._PACK_STR, buf)
+        eq_(sctp.param_ipv6.param_type(), res3[0])
+        eq_(20, res3[1])
+        eq_('fe80::647e:1aff:fec4:8284', addrconv.ipv6.bin_to_text(
+            buf[sctp.param_ipv6._MIN_LEN:sctp.param_ipv6._MIN_LEN + 16]))
+
+        buf = buf[20:]
+        res4 = struct.unpack_from(
+            sctp.param_unrecognized_param._PACK_STR, buf)
+        eq_(sctp.param_unrecognized_param.param_type(), res4[0])
+        eq_(8, res4[1])
+        eq_('\xff\xff\x00\x04',
+            buf[sctp.param_unrecognized_param._MIN_LEN:
+                sctp.param_unrecognized_param._MIN_LEN + 4])
+
+        buf = buf[8:]
+        res5 = struct.unpack_from(sctp.param_ecn._PACK_STR, buf)
+        eq_(sctp.param_ecn.param_type(), res5[0])
+        eq_(4, res5[1])
+
+        buf = buf[4:]
+        res6 = struct.unpack_from(sctp.param_host_addr._PACK_STR, buf)
+        eq_(sctp.param_host_addr.param_type(), res6[0])
+        eq_(16, res6[1])
+        eq_('test host\x00\x00\x00',
+            buf[sctp.param_host_addr._MIN_LEN:
+                sctp.param_host_addr._MIN_LEN + 12])
+
+    def test_serialize_with_sack(self):
+        self.setUp_with_sack()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_sack._PACK_STR, buf)
+        eq_(sctp.chunk_sack.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+        eq_(self.tsn_ack, res[3])
+        eq_(self.a_rwnd, res[4])
+        eq_(self.gapack_num, res[5])
+        eq_(self.duptsn_num, res[6])
+
+        buf = buf[sctp.chunk_sack._MIN_LEN:]
+        gapacks = []
+        for _ in range(self.gapack_num):
+            (gap_s, gap_e) = struct.unpack_from(
+                sctp.chunk_sack._GAPACK_STR, buf)
+            one = [gap_s, gap_e]
+            gapacks.append(one)
+            buf = buf[sctp.chunk_sack._GAPACK_LEN:]
+        duptsns = []
+        for _ in range(self.duptsn_num):
+            (duptsn, ) = struct.unpack_from(
+                sctp.chunk_sack._DUPTSN_STR, buf)
+            duptsns.append(duptsn)
+            buf = buf[sctp.chunk_sack._DUPTSN_LEN:]
+        eq_(self.gapacks, gapacks)
+        eq_(self.duptsns, duptsns)
+
+    def test_serialize_with_heartbeat(self):
+        self.setUp_with_heartbeat()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_heartbeat._PACK_STR, buf)
+        eq_(sctp.chunk_heartbeat.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+
+        buf = buf[sctp.chunk_heartbeat._MIN_LEN:]
+        res1 = struct.unpack_from(sctp.param_heartbeat._PACK_STR, buf)
+        eq_(sctp.param_heartbeat.param_type(), res1[0])
+        eq_(8, res1[1])
+        eq_('\x01\x02\x03\x04',
+            buf[sctp.param_heartbeat._MIN_LEN:
+                sctp.param_heartbeat._MIN_LEN + 4])
+
+    def test_serialize_with_heartbeat_ack(self):
+        self.setUp_with_heartbeat_ack()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_heartbeat_ack._PACK_STR, buf)
+        eq_(sctp.chunk_heartbeat_ack.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+
+        buf = buf[sctp.chunk_heartbeat_ack._MIN_LEN:]
+        res1 = struct.unpack_from(sctp.param_heartbeat._PACK_STR, buf)
+        eq_(sctp.param_heartbeat.param_type(), res1[0])
+        eq_(12, res1[1])
+        eq_('\xff\xee\xdd\xcc\xbb\xaa\x99\x88',
+            buf[sctp.param_heartbeat._MIN_LEN:
+                sctp.param_heartbeat._MIN_LEN + 8])
+
+    def test_serialize_with_abort(self):
+        self.setUp_with_abort()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_abort._PACK_STR, buf)
+        eq_(sctp.chunk_abort.chunk_type(), res[0])
+        flags = self.tflag << 0
+        eq_(flags, res[1])
+        eq_(self.length, res[2])
+
+        buf = buf[sctp.chunk_abort._MIN_LEN:]
+        res1 = struct.unpack_from(sctp.cause_invalid_stream_id._PACK_STR, buf)
+        eq_(sctp.cause_invalid_stream_id.cause_code(), res1[0])
+        eq_(8, res1[1])
+        eq_(4096, res1[2])
+
+        buf = buf[8:]
+        res2 = struct.unpack_from(sctp.cause_missing_param._PACK_STR, buf)
+        eq_(sctp.cause_missing_param.cause_code(), res2[0])
+        eq_(16, res2[1])
+        eq_(4, res2[2])
+        types = []
+        for count in range(4):
+            (tmp, ) = struct.unpack_from(
+                '!H', buf, sctp.cause_missing_param._MIN_LEN + 2 * count)
+            types.append(tmp)
+        eq_(str([sctp.PTYPE_IPV4, sctp.PTYPE_IPV6,
+                 sctp.PTYPE_COOKIE_PRESERVE, sctp.PTYPE_HOST_ADDR]),
+            str(types))
+
+        buf = buf[16:]
+        res3 = struct.unpack_from(sctp.cause_stale_cookie._PACK_STR, buf)
+        eq_(sctp.cause_stale_cookie.cause_code(), res3[0])
+        eq_(8, res3[1])
+        eq_('\x00\x00\x13\x88',
+            buf[sctp.cause_stale_cookie._MIN_LEN:
+                sctp.cause_stale_cookie._MIN_LEN + 4])
+
+        buf = buf[8:]
+        res4 = struct.unpack_from(sctp.cause_out_of_resource._PACK_STR, buf)
+        eq_(sctp.cause_out_of_resource.cause_code(), res4[0])
+        eq_(4, res4[1])
+
+        buf = buf[4:]
+        res5 = struct.unpack_from(
+            sctp.cause_unresolvable_addr._PACK_STR, buf)
+        eq_(sctp.cause_unresolvable_addr.cause_code(), res5[0])
+        eq_(20, res5[1])
+        eq_('\x00\x0b\x00\x10\x74\x65\x73\x74' +
+            '\x20\x68\x6f\x73\x74\x00\x00\x00',
+            buf[sctp.cause_unresolvable_addr._MIN_LEN:
+                sctp.cause_unresolvable_addr._MIN_LEN + 16])
+
+        buf = buf[20:]
+        res6 = struct.unpack_from(
+            sctp.cause_unrecognized_chunk._PACK_STR, buf)
+        eq_(sctp.cause_unrecognized_chunk.cause_code(), res6[0])
+        eq_(8, res6[1])
+        eq_('\xff\x00\x00\x04',
+            buf[sctp.cause_unrecognized_chunk._MIN_LEN:
+                sctp.cause_unrecognized_chunk._MIN_LEN + 4])
+
+        buf = buf[8:]
+        res7 = struct.unpack_from(sctp.cause_invalid_param._PACK_STR, buf)
+        eq_(sctp.cause_invalid_param.cause_code(), res7[0])
+        eq_(4, res7[1])
+
+        buf = buf[4:]
+        res8 = struct.unpack_from(
+            sctp.cause_unrecognized_param._PACK_STR, buf)
+        eq_(sctp.cause_unrecognized_param.cause_code(), res8[0])
+        eq_(8, res8[1])
+        eq_('\xff\xff\x00\x04',
+            buf[sctp.cause_unrecognized_param._MIN_LEN:
+                sctp.cause_unrecognized_param._MIN_LEN + 4])
+
+        buf = buf[8:]
+        res9 = struct.unpack_from(sctp.cause_no_userdata._PACK_STR, buf)
+        eq_(sctp.cause_no_userdata.cause_code(), res9[0])
+        eq_(8, res9[1])
+        eq_('\x00\x01\xe2\x40',
+            buf[sctp.cause_no_userdata._MIN_LEN:
+                sctp.cause_no_userdata._MIN_LEN + 4])
+
+        buf = buf[8:]
+        res10 = struct.unpack_from(
+            sctp.cause_cookie_while_shutdown._PACK_STR, buf)
+        eq_(sctp.cause_cookie_while_shutdown.cause_code(), res10[0])
+        eq_(4, res10[1])
+
+        buf = buf[4:]
+        res11 = struct.unpack_from(
+            sctp.cause_restart_with_new_addr._PACK_STR, buf)
+        eq_(sctp.cause_restart_with_new_addr.cause_code(), res11[0])
+        eq_(12, res11[1])
+        eq_('\x00\x05\x00\x08\xc0\xa8\x01\x01',
+            buf[sctp.cause_restart_with_new_addr._MIN_LEN:
+                sctp.cause_restart_with_new_addr._MIN_LEN + 8])
+
+        buf = buf[12:]
+        res12 = struct.unpack_from(
+            sctp.cause_user_initiated_abort._PACK_STR, buf)
+        eq_(sctp.cause_user_initiated_abort.cause_code(), res12[0])
+        eq_(20, res12[1])
+        eq_('Key Interrupt.\x00\x00',
+            buf[sctp.cause_user_initiated_abort._MIN_LEN:
+                sctp.cause_user_initiated_abort._MIN_LEN + 16])
+
+        buf = buf[20:]
+        res13 = struct.unpack_from(
+            sctp.cause_protocol_violation._PACK_STR, buf)
+        eq_(sctp.cause_protocol_violation.cause_code(), res13[0])
+        eq_(20, res13[1])
+        eq_('Unknown reason.\x00',
+            buf[sctp.cause_protocol_violation._MIN_LEN:
+                sctp.cause_protocol_violation._MIN_LEN + 16])
+
+    def test_serialize_with_shutdown(self):
+        self.setUp_with_shutdown()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_shutdown._PACK_STR, buf)
+        eq_(sctp.chunk_shutdown.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+        eq_(self.tsn_ack, res[3])
+
+    def test_serialize_with_shutdown_ack(self):
+        self.setUp_with_shutdown_ack()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_shutdown_ack._PACK_STR, buf)
+        eq_(sctp.chunk_shutdown_ack.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+
+    def test_serialize_with_error(self):
+        self.setUp_with_error()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_error._PACK_STR, buf)
+        eq_(sctp.chunk_error.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+
+        buf = buf[sctp.chunk_error._MIN_LEN:]
+        res1 = struct.unpack_from(sctp.cause_invalid_stream_id._PACK_STR, buf)
+        eq_(sctp.cause_invalid_stream_id.cause_code(), res1[0])
+        eq_(8, res1[1])
+        eq_(4096, res1[2])
+
+        buf = buf[8:]
+        res2 = struct.unpack_from(sctp.cause_missing_param._PACK_STR, buf)
+        eq_(sctp.cause_missing_param.cause_code(), res2[0])
+        eq_(16, res2[1])
+        eq_(4, res2[2])
+        types = []
+        for count in range(4):
+            (tmp, ) = struct.unpack_from(
+                '!H', buf, sctp.cause_missing_param._MIN_LEN + 2 * count)
+            types.append(tmp)
+        eq_(str([sctp.PTYPE_IPV4, sctp.PTYPE_IPV6,
+                 sctp.PTYPE_COOKIE_PRESERVE, sctp.PTYPE_HOST_ADDR]),
+            str(types))
+
+        buf = buf[16:]
+        res3 = struct.unpack_from(sctp.cause_stale_cookie._PACK_STR, buf)
+        eq_(sctp.cause_stale_cookie.cause_code(), res3[0])
+        eq_(8, res3[1])
+        eq_('\x00\x00\x13\x88',
+            buf[sctp.cause_stale_cookie._MIN_LEN:
+                sctp.cause_stale_cookie._MIN_LEN + 4])
+
+        buf = buf[8:]
+        res4 = struct.unpack_from(sctp.cause_out_of_resource._PACK_STR, buf)
+        eq_(sctp.cause_out_of_resource.cause_code(), res4[0])
+        eq_(4, res4[1])
+
+        buf = buf[4:]
+        res5 = struct.unpack_from(
+            sctp.cause_unresolvable_addr._PACK_STR, buf)
+        eq_(sctp.cause_unresolvable_addr.cause_code(), res5[0])
+        eq_(20, res5[1])
+        eq_('\x00\x0b\x00\x10\x74\x65\x73\x74' +
+            '\x20\x68\x6f\x73\x74\x00\x00\x00',
+            buf[sctp.cause_unresolvable_addr._MIN_LEN:
+                sctp.cause_unresolvable_addr._MIN_LEN + 16])
+
+        buf = buf[20:]
+        res6 = struct.unpack_from(
+            sctp.cause_unrecognized_chunk._PACK_STR, buf)
+        eq_(sctp.cause_unrecognized_chunk.cause_code(), res6[0])
+        eq_(8, res6[1])
+        eq_('\xff\x00\x00\x04',
+            buf[sctp.cause_unrecognized_chunk._MIN_LEN:
+                sctp.cause_unrecognized_chunk._MIN_LEN + 4])
+
+        buf = buf[8:]
+        res7 = struct.unpack_from(sctp.cause_invalid_param._PACK_STR, buf)
+        eq_(sctp.cause_invalid_param.cause_code(), res7[0])
+        eq_(4, res7[1])
+
+        buf = buf[4:]
+        res8 = struct.unpack_from(
+            sctp.cause_unrecognized_param._PACK_STR, buf)
+        eq_(sctp.cause_unrecognized_param.cause_code(), res8[0])
+        eq_(8, res8[1])
+        eq_('\xff\xff\x00\x04',
+            buf[sctp.cause_unrecognized_param._MIN_LEN:
+                sctp.cause_unrecognized_param._MIN_LEN + 4])
+
+        buf = buf[8:]
+        res9 = struct.unpack_from(sctp.cause_no_userdata._PACK_STR, buf)
+        eq_(sctp.cause_no_userdata.cause_code(), res9[0])
+        eq_(8, res9[1])
+        eq_('\x00\x01\xe2\x40',
+            buf[sctp.cause_no_userdata._MIN_LEN:
+                sctp.cause_no_userdata._MIN_LEN + 4])
+
+        buf = buf[8:]
+        res10 = struct.unpack_from(
+            sctp.cause_cookie_while_shutdown._PACK_STR, buf)
+        eq_(sctp.cause_cookie_while_shutdown.cause_code(), res10[0])
+        eq_(4, res10[1])
+
+        buf = buf[4:]
+        res11 = struct.unpack_from(
+            sctp.cause_restart_with_new_addr._PACK_STR, buf)
+        eq_(sctp.cause_restart_with_new_addr.cause_code(), res11[0])
+        eq_(12, res11[1])
+        eq_('\x00\x05\x00\x08\xc0\xa8\x01\x01',
+            buf[sctp.cause_restart_with_new_addr._MIN_LEN:
+                sctp.cause_restart_with_new_addr._MIN_LEN + 8])
+
+        buf = buf[12:]
+        res12 = struct.unpack_from(
+            sctp.cause_user_initiated_abort._PACK_STR, buf)
+        eq_(sctp.cause_user_initiated_abort.cause_code(), res12[0])
+        eq_(20, res12[1])
+        eq_('Key Interrupt.\x00\x00',
+            buf[sctp.cause_user_initiated_abort._MIN_LEN:
+                sctp.cause_user_initiated_abort._MIN_LEN + 16])
+
+        buf = buf[20:]
+        res13 = struct.unpack_from(
+            sctp.cause_protocol_violation._PACK_STR, buf)
+        eq_(sctp.cause_protocol_violation.cause_code(), res13[0])
+        eq_(20, res13[1])
+        eq_('Unknown reason.\x00',
+            buf[sctp.cause_protocol_violation._MIN_LEN:
+                sctp.cause_protocol_violation._MIN_LEN + 16])
+
+    def test_serialize_with_cookie_echo(self):
+        self.setUp_with_cookie_echo()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_cookie_echo._PACK_STR, buf)
+        eq_(sctp.chunk_cookie_echo.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+        eq_(self.cookie,
+            buf[sctp.chunk_cookie_echo._MIN_LEN:
+                sctp.chunk_cookie_echo._MIN_LEN + 4])
+
+    def test_serialize_with_cookie_ack(self):
+        self.setUp_with_cookie_ack()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_cookie_ack._PACK_STR, buf)
+        eq_(sctp.chunk_cookie_ack.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+
+    def test_serialize_with_ecn_echo(self):
+        self.setUp_with_ecn_echo()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_ecn_echo._PACK_STR, buf)
+        eq_(sctp.chunk_ecn_echo.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+        eq_(self.low_tsn, res[3])
+
+    def test_serialize_with_cwr(self):
+        self.setUp_with_cwr()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_cwr._PACK_STR, buf)
+        eq_(sctp.chunk_cwr.chunk_type(), res[0])
+        eq_(self.flags, res[1])
+        eq_(self.length, res[2])
+        eq_(self.low_tsn, res[3])
+
+    def test_serialize_with_shutdown_complete(self):
+        self.setUp_with_shutdown_complete()
+        buf = self._test_serialize()
+        res = struct.unpack_from(
+            sctp.chunk_shutdown_complete._PACK_STR, buf)
+        eq_(sctp.chunk_shutdown_complete.chunk_type(), res[0])
+        flags = self.tflag << 0
+        eq_(flags, res[1])
+        eq_(self.length, res[2])
+
+    def test_serialize_with_multi_chunks(self):
+        self.setUp_with_multi_chunks()
+        buf = self._test_serialize()
+        res = struct.unpack_from(sctp.chunk_sack._PACK_STR, buf)
+        eq_(sctp.chunk_sack.chunk_type(), res[0])
+        eq_(self.s_flags, res[1])
+        eq_(self.s_length, res[2])
+        eq_(self.s_tsn_ack, res[3])
+        eq_(self.s_a_rwnd, res[4])
+        eq_(self.s_gapack_num, res[5])
+        eq_(self.s_duptsn_num, res[6])
+
+        buf = buf[self.s_length:]
+        res = struct.unpack_from(sctp.chunk_data._PACK_STR, buf)
+        eq_(sctp.chunk_data.chunk_type(), res[0])
+        d1_flags = (
+            (self.d1_unordered << 2) |
+            (self.d1_begin << 1) |
+            (self.d1_end << 0))
+        eq_(d1_flags, res[1])
+        eq_(self.d1_length, res[2])
+        eq_(self.d1_tsn, res[3])
+        eq_(self.d1_sid, res[4])
+        eq_(self.d1_seq, res[5])
+        eq_(self.d1_payload_id, res[6])
+        eq_(self.d1_payload_data,
+            buf[sctp.chunk_data._MIN_LEN:
+                sctp.chunk_data._MIN_LEN + 10])
+
+        buf = buf[self.d1_length:]
+        res = struct.unpack_from(sctp.chunk_data._PACK_STR, buf)
+        eq_(sctp.chunk_data.chunk_type(), res[0])
+        d2_flags = (
+            (self.d2_unordered << 2) |
+            (self.d2_begin << 1) |
+            (self.d2_end << 0))
+        eq_(d2_flags, res[1])
+        eq_(self.d2_length, res[2])
+        eq_(self.d2_tsn, res[3])
+        eq_(self.d2_sid, res[4])
+        eq_(self.d2_seq, res[5])
+        eq_(self.d2_payload_id, res[6])
+        eq_(self.d2_payload_data,
+            buf[sctp.chunk_data._MIN_LEN:
+                sctp.chunk_data._MIN_LEN + 10])
+
+    def test_to_string(self):
+        sctp_values = {'src_port': self.src_port,
+                       'dst_port': self.dst_port,
+                       'vtag': self.vtag,
+                       'csum': self.csum,
+                       'chunks': self.chunks}
+        _sctp_str = ','.join(['%s=%s' % (k, sctp_values[k])
+                              for k, _ in inspect.getmembers(self.sc)
+                              if k in sctp_values])
+        sctp_str = '%s(%s)' % (sctp.sctp.__name__, _sctp_str)
+
+        eq_(str(self.sc), sctp_str)
+        eq_(repr(self.sc), sctp_str)
+
+    def test_to_string_with_data(self):
+        self.setUp_with_data()
+        self.test_to_string()
+
+    def test_to_string_with_init(self):
+        self.setUp_with_init()
+        self.test_to_string()
+
+    def test_to_string_with_init_ack(self):
+        self.setUp_with_init_ack()
+        self.test_to_string()
+
+    def test_to_string_with_sack(self):
+        self.setUp_with_sack()
+        self.test_to_string()
+
+    def test_to_string_with_heartbeat(self):
+        self.setUp_with_heartbeat()
+        self.test_to_string()
+
+    def test_to_string_with_heartbeat_ack(self):
+        self.setUp_with_heartbeat_ack()
+        self.test_to_string()
+
+    def test_to_string_with_abort(self):
+        self.setUp_with_abort()
+        self.test_to_string()
+
+    def test_to_string_with_shutdown(self):
+        self.setUp_with_shutdown()
+        self.test_to_string()
+
+    def test_to_string_with_shutdown_ack(self):
+        self.setUp_with_shutdown_ack()
+        self.test_to_string()
+
+    def test_to_string_with_error(self):
+        self.setUp_with_error()
+        self.test_to_string()
+
+    def test_to_string_with_cookie_echo(self):
+        self.setUp_with_cookie_echo()
+        self.test_to_string()
+
+    def test_to_string_with_cookie_ack(self):
+        self.setUp_with_cookie_ack()
+        self.test_to_string()
+
+    def test_to_string_with_ecn_echo(self):
+        self.setUp_with_ecn_echo()
+        self.test_to_string()
+
+    def test_to_string_with_cwr(self):
+        self.setUp_with_cwr()
+        self.test_to_string()
+
+    def test_to_string_with_shutdown_complete(self):
+        self.setUp_with_shutdown_complete()
+        self.test_to_string()
+
+    def test_to_string_with_multi_chunks(self):
+        self.setUp_with_multi_chunks()
+        self.test_to_string()