diff --git a/net/dcsctp/packet/BUILD.gn b/net/dcsctp/packet/BUILD.gn
index 5bfe74a..61bbdc8 100644
--- a/net/dcsctp/packet/BUILD.gn
+++ b/net/dcsctp/packet/BUILD.gn
@@ -198,6 +198,21 @@
   ]
 }
 
+rtc_library("sctp_packet") {
+  deps = [
+    ":crc32c",
+    "../../../api:array_view",
+    "../../../rtc_base",
+    "../../../rtc_base:checks",
+    "../../../rtc_base:rtc_base_approved",
+    "../public:types",
+  ]
+  sources = [
+    "sctp_packet.cc",
+    "sctp_packet.h",
+  ]
+}
+
 if (rtc_include_tests) {
   rtc_library("dcsctp_packet_unittests") {
     testonly = true
@@ -208,6 +223,7 @@
       ":crc32c",
       ":error_cause",
       ":parameter",
+      ":sctp_packet",
       ":tlv_trait",
       "../../../api:array_view",
       "../../../rtc_base:checks",
@@ -258,6 +274,7 @@
       "parameter/ssn_tsn_reset_request_parameter_test.cc",
       "parameter/state_cookie_parameter_test.cc",
       "parameter/supported_extensions_parameter_test.cc",
+      "sctp_packet_test.cc",
       "tlv_trait_test.cc",
     ]
   }
diff --git a/net/dcsctp/packet/sctp_packet.cc b/net/dcsctp/packet/sctp_packet.cc
new file mode 100644
index 0000000..53f77ef
--- /dev/null
+++ b/net/dcsctp/packet/sctp_packet.cc
@@ -0,0 +1,159 @@
+/*
+ *  Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "net/dcsctp/packet/sctp_packet.h"
+
+#include <stddef.h>
+
+#include <cstdint>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/memory/memory.h"
+#include "absl/types/optional.h"
+#include "api/array_view.h"
+#include "net/dcsctp/common/math.h"
+#include "net/dcsctp/packet/bounded_byte_reader.h"
+#include "net/dcsctp/packet/bounded_byte_writer.h"
+#include "net/dcsctp/packet/chunk/chunk.h"
+#include "net/dcsctp/packet/crc32c.h"
+#include "net/dcsctp/public/dcsctp_options.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/strings/string_format.h"
+
+namespace dcsctp {
+namespace {
+constexpr size_t kMaxUdpPacketSize = 65535;
+constexpr size_t kChunkTlvHeaderSize = 4;
+constexpr size_t kExpectedDescriptorCount = 4;
+}  // namespace
+
+/*
+  0                   1                   2                   3
+  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+  |     Source Port Number        |     Destination Port Number   |
+  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+  |                      Verification Tag                         |
+  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+  |                           Checksum                            |
+  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+SctpPacket::Builder::Builder(VerificationTag verification_tag,
+                             const DcSctpOptions& options)
+    : verification_tag_(verification_tag),
+      source_port_(options.local_port),
+      dest_port_(options.remote_port),
+      max_mtu_(options.mtu) {}
+
+SctpPacket::Builder& SctpPacket::Builder::Add(const Chunk& chunk) {
+  if (out_.empty()) {
+    out_.reserve(max_mtu_);
+    out_.resize(SctpPacket::kHeaderSize);
+    BoundedByteWriter<kHeaderSize> buffer(out_);
+    buffer.Store16<0>(source_port_);
+    buffer.Store16<2>(dest_port_);
+    buffer.Store32<4>(*verification_tag_);
+    // Checksum is at offset 8 - written when calling Build();
+  }
+  chunk.SerializeTo(out_);
+  if (out_.size() % 4 != 0) {
+    out_.resize(RoundUpTo4(out_.size()));
+  }
+
+  return *this;
+}
+
+std::vector<uint8_t> SctpPacket::Builder::Build() {
+  std::vector<uint8_t> out;
+  out_.swap(out);
+
+  if (!out.empty()) {
+    uint32_t crc = GenerateCrc32C(out);
+    BoundedByteWriter<kHeaderSize>(out).Store32<8>(crc);
+  }
+  return out;
+}
+
+absl::optional<SctpPacket> SctpPacket::Parse(
+    rtc::ArrayView<const uint8_t> data,
+    bool disable_checksum_verification) {
+  if (data.size() < kHeaderSize + kChunkTlvHeaderSize ||
+      data.size() > kMaxUdpPacketSize) {
+    RTC_DLOG(LS_WARNING) << "Invalid packet size";
+    return absl::nullopt;
+  }
+
+  BoundedByteReader<kHeaderSize> reader(data);
+
+  CommonHeader common_header;
+  common_header.source_port = reader.Load16<0>();
+  common_header.destination_port = reader.Load16<2>();
+  common_header.verification_tag = VerificationTag(reader.Load32<4>());
+  common_header.checksum = reader.Load32<8>();
+
+  // Create a copy of the packet, which will be held by this object.
+  std::vector<uint8_t> data_copy =
+      std::vector<uint8_t>(data.begin(), data.end());
+
+  // Verify the checksum. The checksum field must be zero when that's done.
+  BoundedByteWriter<kHeaderSize>(data_copy).Store32<8>(0);
+  uint32_t calculated_checksum = GenerateCrc32C(data_copy);
+  if (!disable_checksum_verification &&
+      calculated_checksum != common_header.checksum) {
+    RTC_DLOG(LS_WARNING) << rtc::StringFormat(
+        "Invalid packet checksum, packet_checksum=0x%08x, "
+        "calculated_checksum=0x%08x",
+        common_header.checksum, calculated_checksum);
+    return absl::nullopt;
+  }
+  // Restore the checksum in the header.
+  BoundedByteWriter<kHeaderSize>(data_copy).Store32<8>(common_header.checksum);
+
+  // Validate and parse the chunk headers in the message.
+  /*
+    0                   1                   2                   3
+    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |   Chunk Type  | Chunk  Flags  |        Chunk Length           |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+  */
+
+  std::vector<ChunkDescriptor> descriptors;
+  descriptors.reserve(kExpectedDescriptorCount);
+  rtc::ArrayView<const uint8_t> descriptor_data =
+      rtc::ArrayView<const uint8_t>(data_copy).subview(kHeaderSize);
+  while (!descriptor_data.empty()) {
+    if (descriptor_data.size() < kChunkTlvHeaderSize) {
+      RTC_DLOG(LS_WARNING) << "Too small chunk";
+      return absl::nullopt;
+    }
+    BoundedByteReader<kChunkTlvHeaderSize> chunk_header(descriptor_data);
+    uint8_t type = chunk_header.Load8<0>();
+    uint8_t flags = chunk_header.Load8<1>();
+    uint16_t length = chunk_header.Load16<2>();
+    uint16_t padded_length = RoundUpTo4(length);
+    if (padded_length > descriptor_data.size()) {
+      RTC_DLOG(LS_WARNING) << "Too large chunk. length=" << length
+                           << ", remaining=" << descriptor_data.size();
+      return absl::nullopt;
+    }
+    descriptors.emplace_back(type, flags,
+                             descriptor_data.subview(0, padded_length));
+    descriptor_data = descriptor_data.subview(padded_length);
+  }
+
+  // Note that iterators (and pointer) are guaranteed to be stable when moving a
+  // std::vector, and `descriptors` have pointers to within `data_copy`.
+  return SctpPacket(common_header, std::move(data_copy),
+                    std::move(descriptors));
+}
+}  // namespace dcsctp
diff --git a/net/dcsctp/packet/sctp_packet.h b/net/dcsctp/packet/sctp_packet.h
new file mode 100644
index 0000000..927b8db
--- /dev/null
+++ b/net/dcsctp/packet/sctp_packet.h
@@ -0,0 +1,121 @@
+/*
+ *  Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef NET_DCSCTP_PACKET_SCTP_PACKET_H_
+#define NET_DCSCTP_PACKET_SCTP_PACKET_H_
+
+#include <stddef.h>
+
+#include <cstdint>
+#include <functional>
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "api/array_view.h"
+#include "net/dcsctp/common/internal_types.h"
+#include "net/dcsctp/packet/chunk/chunk.h"
+#include "net/dcsctp/public/dcsctp_options.h"
+
+namespace dcsctp {
+
+// The "Common Header", which every SCTP packet starts with, and is described in
+// https://tools.ietf.org/html/rfc4960#section-3.1.
+struct CommonHeader {
+  uint16_t source_port;
+  uint16_t destination_port;
+  VerificationTag verification_tag;
+  uint32_t checksum;
+};
+
+// Represents an immutable (received or to-be-sent) SCTP packet.
+class SctpPacket {
+ public:
+  static constexpr size_t kHeaderSize = 12;
+
+  struct ChunkDescriptor {
+    ChunkDescriptor(uint8_t type,
+                    uint8_t flags,
+                    rtc::ArrayView<const uint8_t> data)
+        : type(type), flags(flags), data(data) {}
+    uint8_t type;
+    uint8_t flags;
+    rtc::ArrayView<const uint8_t> data;
+  };
+
+  SctpPacket(SctpPacket&& other) = default;
+  SctpPacket& operator=(SctpPacket&& other) = default;
+  SctpPacket(const SctpPacket&) = delete;
+  SctpPacket& operator=(const SctpPacket&) = delete;
+
+  // Used for building SctpPacket, as those are immutable.
+  class Builder {
+   public:
+    Builder(VerificationTag verification_tag, const DcSctpOptions& options);
+
+    Builder(Builder&& other) = default;
+    Builder& operator=(Builder&& other) = default;
+
+    // Adds a chunk to the to-be-built SCTP packet.
+    Builder& Add(const Chunk& chunk);
+
+    // The number of bytes remaining in the packet, until the MTU is reached.
+    size_t bytes_remaining() const {
+      return out_.size() >= max_mtu_ ? 0 : max_mtu_ - out_.size();
+    }
+
+    // Indicates if any packets have been added to the builder.
+    bool empty() const { return out_.empty(); }
+
+    // Returns the payload of the build SCTP packet. The Builder will be cleared
+    // after having called this function, and can be used to build a new packet.
+    std::vector<uint8_t> Build();
+
+   private:
+    void WritePacketHeader();
+    VerificationTag verification_tag_;
+    uint16_t source_port_;
+    uint16_t dest_port_;
+    size_t max_mtu_;
+    std::vector<uint8_t> out_;
+  };
+
+  // Parses `data` as an SCTP packet and returns it if it validates.
+  static absl::optional<SctpPacket> Parse(
+      rtc::ArrayView<const uint8_t> data,
+      bool disable_checksum_verification = false);
+
+  // Returns the SCTP common header.
+  const CommonHeader& common_header() const { return common_header_; }
+
+  // Returns the chunks (types and offsets) within the packet.
+  rtc::ArrayView<const ChunkDescriptor> descriptors() const {
+    return descriptors_;
+  }
+
+ private:
+  SctpPacket(const CommonHeader& common_header,
+             std::vector<uint8_t> data,
+             std::vector<ChunkDescriptor> descriptors)
+      : common_header_(common_header),
+        data_(std::move(data)),
+        descriptors_(std::move(descriptors)) {}
+
+  CommonHeader common_header_;
+
+  // As the `descriptors_` refer to offset within data, and since SctpPacket is
+  // movable, `data` needs to be pointer stable, which it is according to
+  // http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#2321
+  std::vector<uint8_t> data_;
+  // The chunks and their offsets within `data_ `.
+  std::vector<ChunkDescriptor> descriptors_;
+};
+}  // namespace dcsctp
+
+#endif  // NET_DCSCTP_PACKET_SCTP_PACKET_H_
diff --git a/net/dcsctp/packet/sctp_packet_test.cc b/net/dcsctp/packet/sctp_packet_test.cc
new file mode 100644
index 0000000..ad4d0cc
--- /dev/null
+++ b/net/dcsctp/packet/sctp_packet_test.cc
@@ -0,0 +1,296 @@
+/*
+ *  Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "net/dcsctp/packet/sctp_packet.h"
+
+#include <cstdint>
+#include <utility>
+#include <vector>
+
+#include "api/array_view.h"
+#include "net/dcsctp/common/internal_types.h"
+#include "net/dcsctp/packet/chunk/abort_chunk.h"
+#include "net/dcsctp/packet/chunk/cookie_ack_chunk.h"
+#include "net/dcsctp/packet/chunk/data_chunk.h"
+#include "net/dcsctp/packet/chunk/init_chunk.h"
+#include "net/dcsctp/packet/chunk/sack_chunk.h"
+#include "net/dcsctp/packet/error_cause/error_cause.h"
+#include "net/dcsctp/packet/error_cause/user_initiated_abort_cause.h"
+#include "net/dcsctp/packet/parameter/parameter.h"
+#include "net/dcsctp/packet/tlv_trait.h"
+#include "net/dcsctp/testing/testing_macros.h"
+#include "rtc_base/gunit.h"
+#include "test/gmock.h"
+
+namespace dcsctp {
+namespace {
+using ::testing::SizeIs;
+
+constexpr VerificationTag kVerificationTag = VerificationTag(0x12345678);
+
+TEST(SctpPacketTest, DeserializeSimplePacketFromCapture) {
+  /*
+  Stream Control Transmission Protocol, Src Port: 5000 (5000), Dst Port: 5000
+    (5000) Source port: 5000 Destination port: 5000 Verification tag: 0x00000000
+      [Association index: 1]
+      Checksum: 0xaa019d33 [unverified]
+      [Checksum Status: Unverified]
+      INIT chunk (Outbound streams: 1000, inbound streams: 1000)
+          Chunk type: INIT (1)
+          Chunk flags: 0x00
+          Chunk length: 90
+          Initiate tag: 0x0eddca08
+          Advertised receiver window credit (a_rwnd): 131072
+          Number of outbound streams: 1000
+          Number of inbound streams: 1000
+          Initial TSN: 1426601527
+          ECN parameter
+              Parameter type: ECN (0x8000)
+              Parameter length: 4
+          Forward TSN supported parameter
+              Parameter type: Forward TSN supported (0xc000)
+              Parameter length: 4
+          Supported Extensions parameter (Supported types: FORWARD_TSN, AUTH,
+            ASCONF, ASCONF_ACK, RE_CONFIG) Parameter type: Supported Extensions
+  (0x8008) Parameter length: 9 Supported chunk type: FORWARD_TSN (192) Supported
+  chunk type: AUTH (15) Supported chunk type: ASCONF (193) Supported chunk type:
+  ASCONF_ACK (128) Supported chunk type: RE_CONFIG (130) Parameter padding:
+  000000 Random parameter Parameter type: Random (0x8002) Parameter length: 36
+              Random number: c5a86155090e6f420050634cc8d6b908dfd53e17c99cb143…
+          Requested HMAC Algorithm parameter (Supported HMACs: SHA-1)
+              Parameter type: Requested HMAC Algorithm (0x8004)
+              Parameter length: 6
+              HMAC identifier: SHA-1 (1)
+              Parameter padding: 0000
+          Authenticated Chunk list parameter (Chunk types to be authenticated:
+            ASCONF_ACK, ASCONF) Parameter type: Authenticated Chunk list
+  (0x8003) Parameter length: 6 Chunk type: ASCONF_ACK (128) Chunk type: ASCONF
+  (193) Chunk padding: 0000
+  */
+
+  uint8_t data[] = {
+      0x13, 0x88, 0x13, 0x88, 0x00, 0x00, 0x00, 0x00, 0xaa, 0x01, 0x9d, 0x33,
+      0x01, 0x00, 0x00, 0x5a, 0x0e, 0xdd, 0xca, 0x08, 0x00, 0x02, 0x00, 0x00,
+      0x03, 0xe8, 0x03, 0xe8, 0x55, 0x08, 0x36, 0x37, 0x80, 0x00, 0x00, 0x04,
+      0xc0, 0x00, 0x00, 0x04, 0x80, 0x08, 0x00, 0x09, 0xc0, 0x0f, 0xc1, 0x80,
+      0x82, 0x00, 0x00, 0x00, 0x80, 0x02, 0x00, 0x24, 0xc5, 0xa8, 0x61, 0x55,
+      0x09, 0x0e, 0x6f, 0x42, 0x00, 0x50, 0x63, 0x4c, 0xc8, 0xd6, 0xb9, 0x08,
+      0xdf, 0xd5, 0x3e, 0x17, 0xc9, 0x9c, 0xb1, 0x43, 0x28, 0x4e, 0xaf, 0x64,
+      0x68, 0x2a, 0xc2, 0x97, 0x80, 0x04, 0x00, 0x06, 0x00, 0x01, 0x00, 0x00,
+      0x80, 0x03, 0x00, 0x06, 0x80, 0xc1, 0x00, 0x00};
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(SctpPacket packet, SctpPacket::Parse(data));
+  EXPECT_EQ(packet.common_header().source_port, 5000);
+  EXPECT_EQ(packet.common_header().destination_port, 5000);
+  EXPECT_EQ(packet.common_header().verification_tag, VerificationTag(0));
+  EXPECT_EQ(packet.common_header().checksum, 0xaa019d33);
+
+  EXPECT_THAT(packet.descriptors(), SizeIs(1));
+  EXPECT_EQ(packet.descriptors()[0].type, InitChunk::kType);
+  ASSERT_HAS_VALUE_AND_ASSIGN(InitChunk init,
+                              InitChunk::Parse(packet.descriptors()[0].data));
+  EXPECT_EQ(init.initial_tsn(), TSN(1426601527));
+}
+
+TEST(SctpPacketTest, DeserializePacketWithTwoChunks) {
+  /*
+  Stream Control Transmission Protocol, Src Port: 1234 (1234),
+    Dst Port: 4321 (4321)
+      Source port: 1234
+      Destination port: 4321
+      Verification tag: 0x697e3a4e
+      [Association index: 3]
+      Checksum: 0xc06e8b36 [unverified]
+      [Checksum Status: Unverified]
+      COOKIE_ACK chunk
+          Chunk type: COOKIE_ACK (11)
+          Chunk flags: 0x00
+          Chunk length: 4
+      SACK chunk (Cumulative TSN: 2930332242, a_rwnd: 131072,
+        gaps: 0, duplicate TSNs: 0)
+          Chunk type: SACK (3)
+          Chunk flags: 0x00
+          Chunk length: 16
+          Cumulative TSN ACK: 2930332242
+          Advertised receiver window credit (a_rwnd): 131072
+          Number of gap acknowledgement blocks: 0
+          Number of duplicated TSNs: 0
+  */
+
+  uint8_t data[] = {0x04, 0xd2, 0x10, 0xe1, 0x69, 0x7e, 0x3a, 0x4e,
+                    0xc0, 0x6e, 0x8b, 0x36, 0x0b, 0x00, 0x00, 0x04,
+                    0x03, 0x00, 0x00, 0x10, 0xae, 0xa9, 0x52, 0x52,
+                    0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(SctpPacket packet, SctpPacket::Parse(data));
+  EXPECT_EQ(packet.common_header().source_port, 1234);
+  EXPECT_EQ(packet.common_header().destination_port, 4321);
+  EXPECT_EQ(packet.common_header().verification_tag,
+            VerificationTag(0x697e3a4eu));
+  EXPECT_EQ(packet.common_header().checksum, 0xc06e8b36u);
+
+  EXPECT_THAT(packet.descriptors(), SizeIs(2));
+  EXPECT_EQ(packet.descriptors()[0].type, CookieAckChunk::kType);
+  EXPECT_EQ(packet.descriptors()[1].type, SackChunk::kType);
+  ASSERT_HAS_VALUE_AND_ASSIGN(
+      CookieAckChunk cookie_ack,
+      CookieAckChunk::Parse(packet.descriptors()[0].data));
+  ASSERT_HAS_VALUE_AND_ASSIGN(SackChunk sack,
+                              SackChunk::Parse(packet.descriptors()[1].data));
+}
+
+TEST(SctpPacketTest, DeserializePacketWithWrongChecksum) {
+  /*
+  Stream Control Transmission Protocol, Src Port: 5000 (5000),
+    Dst Port: 5000 (5000)
+      Source port: 5000
+      Destination port: 5000
+      Verification tag: 0x0eddca08
+      [Association index: 1]
+      Checksum: 0x2a81f531 [unverified]
+      [Checksum Status: Unverified]
+      SACK chunk (Cumulative TSN: 1426601536, a_rwnd: 131072,
+        gaps: 0, duplicate TSNs: 0)
+          Chunk type: SACK (3)
+          Chunk flags: 0x00
+          Chunk length: 16
+          Cumulative TSN ACK: 1426601536
+          Advertised receiver window credit (a_rwnd): 131072
+          Number of gap acknowledgement blocks: 0
+          Number of duplicated TSNs: 0
+  */
+
+  uint8_t data[] = {0x13, 0x88, 0x13, 0x88, 0x0e, 0xdd, 0xca, 0x08, 0x2a, 0x81,
+                    0xf5, 0x31, 0x03, 0x00, 0x00, 0x10, 0x55, 0x08, 0x36, 0x40,
+                    0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+
+  EXPECT_FALSE(SctpPacket::Parse(data).has_value());
+}
+
+TEST(SctpPacketTest, DeserializePacketDontValidateChecksum) {
+  /*
+  Stream Control Transmission Protocol, Src Port: 5000 (5000),
+    Dst Port: 5000 (5000)
+      Source port: 5000
+      Destination port: 5000
+      Verification tag: 0x0eddca08
+      [Association index: 1]
+      Checksum: 0x2a81f531 [unverified]
+      [Checksum Status: Unverified]
+      SACK chunk (Cumulative TSN: 1426601536, a_rwnd: 131072,
+        gaps: 0, duplicate TSNs: 0)
+          Chunk type: SACK (3)
+          Chunk flags: 0x00
+          Chunk length: 16
+          Cumulative TSN ACK: 1426601536
+          Advertised receiver window credit (a_rwnd): 131072
+          Number of gap acknowledgement blocks: 0
+          Number of duplicated TSNs: 0
+  */
+
+  uint8_t data[] = {0x13, 0x88, 0x13, 0x88, 0x0e, 0xdd, 0xca, 0x08, 0x2a, 0x81,
+                    0xf5, 0x31, 0x03, 0x00, 0x00, 0x10, 0x55, 0x08, 0x36, 0x40,
+                    0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(
+      SctpPacket packet,
+      SctpPacket::Parse(data, /*disable_checksum_verification=*/true));
+  EXPECT_EQ(packet.common_header().source_port, 5000);
+  EXPECT_EQ(packet.common_header().destination_port, 5000);
+  EXPECT_EQ(packet.common_header().verification_tag,
+            VerificationTag(0x0eddca08u));
+  EXPECT_EQ(packet.common_header().checksum, 0x2a81f531u);
+}
+
+TEST(SctpPacketTest, SerializeAndDeserializeSingleChunk) {
+  SctpPacket::Builder b(kVerificationTag, {});
+  InitChunk init(/*initiate_tag=*/VerificationTag(123), /*a_rwnd=*/456,
+                 /*nbr_outbound_streams=*/65535,
+                 /*nbr_inbound_streams=*/65534, /*initial_tsn=*/TSN(789),
+                 /*parameters=*/Parameters());
+
+  b.Add(init);
+  std::vector<uint8_t> serialized = b.Build();
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(SctpPacket packet, SctpPacket::Parse(serialized));
+
+  EXPECT_EQ(packet.common_header().verification_tag, kVerificationTag);
+
+  ASSERT_THAT(packet.descriptors(), SizeIs(1));
+  EXPECT_EQ(packet.descriptors()[0].type, InitChunk::kType);
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(InitChunk deserialized,
+                              InitChunk::Parse(packet.descriptors()[0].data));
+  EXPECT_EQ(deserialized.initiate_tag(), VerificationTag(123));
+  EXPECT_EQ(deserialized.a_rwnd(), 456u);
+  EXPECT_EQ(deserialized.nbr_outbound_streams(), 65535u);
+  EXPECT_EQ(deserialized.nbr_inbound_streams(), 65534u);
+  EXPECT_EQ(deserialized.initial_tsn(), TSN(789));
+}
+
+TEST(SctpPacketTest, SerializeAndDeserializeThreeChunks) {
+  SctpPacket::Builder b(kVerificationTag, {});
+  b.Add(SackChunk(/*cumulative_tsn_ack=*/TSN(999), /*a_rwnd=*/456,
+                  {SackChunk::GapAckBlock(2, 3)},
+                  /*duplicate_tsns=*/{TSN(1), TSN(2), TSN(3)}));
+  b.Add(DataChunk(TSN(123), StreamID(456), SSN(789), PPID(9090),
+                  /*payload=*/{1, 2, 3, 4, 5},
+                  /*options=*/{}));
+  b.Add(DataChunk(TSN(124), StreamID(654), SSN(987), PPID(909),
+                  /*payload=*/{5, 4, 3, 3, 1},
+                  /*options=*/{}));
+
+  std::vector<uint8_t> serialized = b.Build();
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(SctpPacket packet, SctpPacket::Parse(serialized));
+
+  EXPECT_EQ(packet.common_header().verification_tag, kVerificationTag);
+
+  ASSERT_THAT(packet.descriptors(), SizeIs(3));
+  EXPECT_EQ(packet.descriptors()[0].type, SackChunk::kType);
+  EXPECT_EQ(packet.descriptors()[1].type, DataChunk::kType);
+  EXPECT_EQ(packet.descriptors()[2].type, DataChunk::kType);
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(SackChunk sack,
+                              SackChunk::Parse(packet.descriptors()[0].data));
+  EXPECT_EQ(sack.cumulative_tsn_ack(), TSN(999));
+  EXPECT_EQ(sack.a_rwnd(), 456u);
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(DataChunk data1,
+                              DataChunk::Parse(packet.descriptors()[1].data));
+  EXPECT_EQ(data1.tsn(), TSN(123));
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(DataChunk data2,
+                              DataChunk::Parse(packet.descriptors()[2].data));
+  EXPECT_EQ(data2.tsn(), TSN(124));
+}
+
+TEST(SctpPacketTest, ParseAbortWithEmptyCause) {
+  SctpPacket::Builder b(kVerificationTag, {});
+  b.Add(AbortChunk(
+      /*filled_in_verification_tag=*/true,
+      Parameters::Builder().Add(UserInitiatedAbortCause("")).Build()));
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(SctpPacket packet, SctpPacket::Parse(b.Build()));
+
+  EXPECT_EQ(packet.common_header().verification_tag, kVerificationTag);
+
+  ASSERT_THAT(packet.descriptors(), SizeIs(1));
+  EXPECT_EQ(packet.descriptors()[0].type, AbortChunk::kType);
+
+  ASSERT_HAS_VALUE_AND_ASSIGN(AbortChunk abort,
+                              AbortChunk::Parse(packet.descriptors()[0].data));
+  ASSERT_HAS_VALUE_AND_ASSIGN(
+      UserInitiatedAbortCause cause,
+      abort.error_causes().get<UserInitiatedAbortCause>());
+  EXPECT_EQ(cause.upper_layer_abort_reason(), "");
+}
+
+}  // namespace
+}  // namespace dcsctp