Adding upstream version 0.12.1+dfsg.upstream/0.12.1+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 895 insertions, 0 deletions

diff --git a/lib/ngtcp2_crypto.c b/lib/ngtcp2_crypto.c
new file mode 100644
index 0000000..5e69a82
--- /dev/null
+++ b/lib/ngtcp2_crypto.c
@@ -0,0 +1,895 @@
+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2017 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "ngtcp2_crypto.h"
+
+#include <string.h>
+#include <assert.h>
+
+#include "ngtcp2_str.h"
+#include "ngtcp2_conv.h"
+#include "ngtcp2_conn.h"
+#include "ngtcp2_net.h"
+
+int ngtcp2_crypto_km_new(ngtcp2_crypto_km **pckm, const uint8_t *secret,
+                         size_t secretlen,
+                         const ngtcp2_crypto_aead_ctx *aead_ctx,
+                         const uint8_t *iv, size_t ivlen,
+                         const ngtcp2_mem *mem) {
+  int rv = ngtcp2_crypto_km_nocopy_new(pckm, secretlen, ivlen, mem);
+  if (rv != 0) {
+    return rv;
+  }
+
+  if (secretlen) {
+    memcpy((*pckm)->secret.base, secret, secretlen);
+  }
+  if (aead_ctx) {
+    (*pckm)->aead_ctx = *aead_ctx;
+  }
+  memcpy((*pckm)->iv.base, iv, ivlen);
+
+  return 0;
+}
+
+int ngtcp2_crypto_km_nocopy_new(ngtcp2_crypto_km **pckm, size_t secretlen,
+                                size_t ivlen, const ngtcp2_mem *mem) {
+  size_t len;
+  uint8_t *p;
+
+  len = sizeof(ngtcp2_crypto_km) + secretlen + ivlen;
+
+  *pckm = ngtcp2_mem_malloc(mem, len);
+  if (*pckm == NULL) {
+    return NGTCP2_ERR_NOMEM;
+  }
+
+  p = (uint8_t *)(*pckm) + sizeof(ngtcp2_crypto_km);
+  (*pckm)->secret.base = p;
+  (*pckm)->secret.len = secretlen;
+  p += secretlen;
+  (*pckm)->iv.base = p;
+  (*pckm)->iv.len = ivlen;
+  (*pckm)->aead_ctx.native_handle = NULL;
+  (*pckm)->pkt_num = -1;
+  (*pckm)->use_count = 0;
+  (*pckm)->flags = NGTCP2_CRYPTO_KM_FLAG_NONE;
+
+  return 0;
+}
+
+void ngtcp2_crypto_km_del(ngtcp2_crypto_km *ckm, const ngtcp2_mem *mem) {
+  if (ckm == NULL) {
+    return;
+  }
+
+  ngtcp2_mem_free(mem, ckm);
+}
+
+void ngtcp2_crypto_create_nonce(uint8_t *dest, const uint8_t *iv, size_t ivlen,
+                                int64_t pkt_num) {
+  size_t i;
+  uint64_t n;
+
+  assert(ivlen >= 8);
+
+  memcpy(dest, iv, ivlen);
+  n = ngtcp2_htonl64((uint64_t)pkt_num);
+
+  for (i = 0; i < 8; ++i) {
+    dest[ivlen - 8 + i] ^= ((uint8_t *)&n)[i];
+  }
+}
+
+/*
+ * varint_paramlen returns the length of a single transport parameter
+ * which has variable integer in its parameter.
+ */
+static size_t varint_paramlen(ngtcp2_transport_param_id id, uint64_t param) {
+  size_t valuelen = ngtcp2_put_uvarintlen(param);
+  return ngtcp2_put_uvarintlen(id) + ngtcp2_put_uvarintlen(valuelen) + valuelen;
+}
+
+/*
+ * write_varint_param writes parameter |id| of the given |value| in
+ * varint encoding.  It returns p + the number of bytes written.
+ */
+static uint8_t *write_varint_param(uint8_t *p, ngtcp2_transport_param_id id,
+                                   uint64_t value) {
+  p = ngtcp2_put_uvarint(p, id);
+  p = ngtcp2_put_uvarint(p, ngtcp2_put_uvarintlen(value));
+  return ngtcp2_put_uvarint(p, value);
+}
+
+/*
+ * cid_paramlen returns the length of a single transport parameter
+ * which has |cid| as value.
+ */
+static size_t cid_paramlen(ngtcp2_transport_param_id id,
+                           const ngtcp2_cid *cid) {
+  return ngtcp2_put_uvarintlen(id) + ngtcp2_put_uvarintlen(cid->datalen) +
+         cid->datalen;
+}
+
+/*
+ * write_cid_param writes parameter |id| of the given |cid|.  It
+ * returns p + the number of bytes written.
+ */
+static uint8_t *write_cid_param(uint8_t *p, ngtcp2_transport_param_id id,
+                                const ngtcp2_cid *cid) {
+  assert(cid->datalen == 0 || cid->datalen >= NGTCP2_MIN_CIDLEN);
+  assert(cid->datalen <= NGTCP2_MAX_CIDLEN);
+
+  p = ngtcp2_put_uvarint(p, id);
+  p = ngtcp2_put_uvarint(p, cid->datalen);
+  if (cid->datalen) {
+    p = ngtcp2_cpymem(p, cid->data, cid->datalen);
+  }
+  return p;
+}
+
+static const uint8_t empty_address[16];
+
+ngtcp2_ssize ngtcp2_encode_transport_params_versioned(
+    uint8_t *dest, size_t destlen, ngtcp2_transport_params_type exttype,
+    int transport_params_version, const ngtcp2_transport_params *params) {
+  uint8_t *p;
+  size_t len = 0;
+  /* For some reason, gcc 7.3.0 requires this initialization. */
+  size_t preferred_addrlen = 0;
+  size_t version_infolen = 0;
+  const ngtcp2_sockaddr_in *sa_in;
+  const ngtcp2_sockaddr_in6 *sa_in6;
+  (void)transport_params_version;
+
+  switch (exttype) {
+  case NGTCP2_TRANSPORT_PARAMS_TYPE_CLIENT_HELLO:
+    break;
+  case NGTCP2_TRANSPORT_PARAMS_TYPE_ENCRYPTED_EXTENSIONS:
+    len +=
+        cid_paramlen(NGTCP2_TRANSPORT_PARAM_ORIGINAL_DESTINATION_CONNECTION_ID,
+                     &params->original_dcid);
+
+    if (params->stateless_reset_token_present) {
+      len +=
+          ngtcp2_put_uvarintlen(NGTCP2_TRANSPORT_PARAM_STATELESS_RESET_TOKEN) +
+          ngtcp2_put_uvarintlen(NGTCP2_STATELESS_RESET_TOKENLEN) +
+          NGTCP2_STATELESS_RESET_TOKENLEN;
+    }
+    if (params->preferred_address_present) {
+      assert(params->preferred_address.cid.datalen >= NGTCP2_MIN_CIDLEN);
+      assert(params->preferred_address.cid.datalen <= NGTCP2_MAX_CIDLEN);
+      preferred_addrlen = 4 /* ipv4Address */ + 2 /* ipv4Port */ +
+                          16 /* ipv6Address */ + 2 /* ipv6Port */
+                          + 1 +
+                          params->preferred_address.cid.datalen /* CID */ +
+                          NGTCP2_STATELESS_RESET_TOKENLEN;
+      len += ngtcp2_put_uvarintlen(NGTCP2_TRANSPORT_PARAM_PREFERRED_ADDRESS) +
+             ngtcp2_put_uvarintlen(preferred_addrlen) + preferred_addrlen;
+    }
+    if (params->retry_scid_present) {
+      len += cid_paramlen(NGTCP2_TRANSPORT_PARAM_RETRY_SOURCE_CONNECTION_ID,
+                          &params->retry_scid);
+    }
+    break;
+  default:
+    return NGTCP2_ERR_INVALID_ARGUMENT;
+  }
+
+  len += cid_paramlen(NGTCP2_TRANSPORT_PARAM_INITIAL_SOURCE_CONNECTION_ID,
+                      &params->initial_scid);
+
+  if (params->initial_max_stream_data_bidi_local) {
+    len += varint_paramlen(
+        NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAM_DATA_BIDI_LOCAL,
+        params->initial_max_stream_data_bidi_local);
+  }
+  if (params->initial_max_stream_data_bidi_remote) {
+    len += varint_paramlen(
+        NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAM_DATA_BIDI_REMOTE,
+        params->initial_max_stream_data_bidi_remote);
+  }
+  if (params->initial_max_stream_data_uni) {
+    len += varint_paramlen(NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAM_DATA_UNI,
+                           params->initial_max_stream_data_uni);
+  }
+  if (params->initial_max_data) {
+    len += varint_paramlen(NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_DATA,
+                           params->initial_max_data);
+  }
+  if (params->initial_max_streams_bidi) {
+    len += varint_paramlen(NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAMS_BIDI,
+                           params->initial_max_streams_bidi);
+  }
+  if (params->initial_max_streams_uni) {
+    len += varint_paramlen(NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAMS_UNI,
+                           params->initial_max_streams_uni);
+  }
+  if (params->max_udp_payload_size !=
+      NGTCP2_DEFAULT_MAX_RECV_UDP_PAYLOAD_SIZE) {
+    len += varint_paramlen(NGTCP2_TRANSPORT_PARAM_MAX_UDP_PAYLOAD_SIZE,
+                           params->max_udp_payload_size);
+  }
+  if (params->ack_delay_exponent != NGTCP2_DEFAULT_ACK_DELAY_EXPONENT) {
+    len += varint_paramlen(NGTCP2_TRANSPORT_PARAM_ACK_DELAY_EXPONENT,
+                           params->ack_delay_exponent);
+  }
+  if (params->disable_active_migration) {
+    len +=
+        ngtcp2_put_uvarintlen(NGTCP2_TRANSPORT_PARAM_DISABLE_ACTIVE_MIGRATION) +
+        ngtcp2_put_uvarintlen(0);
+  }
+  if (params->max_ack_delay != NGTCP2_DEFAULT_MAX_ACK_DELAY) {
+    len += varint_paramlen(NGTCP2_TRANSPORT_PARAM_MAX_ACK_DELAY,
+                           params->max_ack_delay / NGTCP2_MILLISECONDS);
+  }
+  if (params->max_idle_timeout) {
+    len += varint_paramlen(NGTCP2_TRANSPORT_PARAM_MAX_IDLE_TIMEOUT,
+                           params->max_idle_timeout / NGTCP2_MILLISECONDS);
+  }
+  if (params->active_connection_id_limit &&
+      params->active_connection_id_limit !=
+          NGTCP2_DEFAULT_ACTIVE_CONNECTION_ID_LIMIT) {
+    len += varint_paramlen(NGTCP2_TRANSPORT_PARAM_ACTIVE_CONNECTION_ID_LIMIT,
+                           params->active_connection_id_limit);
+  }
+  if (params->max_datagram_frame_size) {
+    len += varint_paramlen(NGTCP2_TRANSPORT_PARAM_MAX_DATAGRAM_FRAME_SIZE,
+                           params->max_datagram_frame_size);
+  }
+  if (params->grease_quic_bit) {
+    len += ngtcp2_put_uvarintlen(NGTCP2_TRANSPORT_PARAM_GREASE_QUIC_BIT) +
+           ngtcp2_put_uvarintlen(0);
+  }
+  if (params->version_info_present) {
+    version_infolen = sizeof(uint32_t) + params->version_info.other_versionslen;
+    len += ngtcp2_put_uvarintlen(
+               NGTCP2_TRANSPORT_PARAM_VERSION_INFORMATION_DRAFT) +
+           ngtcp2_put_uvarintlen(version_infolen) + version_infolen;
+  }
+
+  if (dest == NULL && destlen == 0) {
+    return (ngtcp2_ssize)len;
+  }
+
+  if (destlen < len) {
+    return NGTCP2_ERR_NOBUF;
+  }
+
+  p = dest;
+
+  if (exttype == NGTCP2_TRANSPORT_PARAMS_TYPE_ENCRYPTED_EXTENSIONS) {
+    p = write_cid_param(
+        p, NGTCP2_TRANSPORT_PARAM_ORIGINAL_DESTINATION_CONNECTION_ID,
+        &params->original_dcid);
+
+    if (params->stateless_reset_token_present) {
+      p = ngtcp2_put_uvarint(p, NGTCP2_TRANSPORT_PARAM_STATELESS_RESET_TOKEN);
+      p = ngtcp2_put_uvarint(p, sizeof(params->stateless_reset_token));
+      p = ngtcp2_cpymem(p, params->stateless_reset_token,
+                        sizeof(params->stateless_reset_token));
+    }
+    if (params->preferred_address_present) {
+      p = ngtcp2_put_uvarint(p, NGTCP2_TRANSPORT_PARAM_PREFERRED_ADDRESS);
+      p = ngtcp2_put_uvarint(p, preferred_addrlen);
+
+      if (params->preferred_address.ipv4_present) {
+        sa_in = &params->preferred_address.ipv4;
+        p = ngtcp2_cpymem(p, &sa_in->sin_addr, sizeof(sa_in->sin_addr));
+        p = ngtcp2_put_uint16(p, sa_in->sin_port);
+      } else {
+        p = ngtcp2_cpymem(p, empty_address, sizeof(sa_in->sin_addr));
+        p = ngtcp2_put_uint16(p, 0);
+      }
+
+      if (params->preferred_address.ipv6_present) {
+        sa_in6 = &params->preferred_address.ipv6;
+        p = ngtcp2_cpymem(p, &sa_in6->sin6_addr, sizeof(sa_in6->sin6_addr));
+        p = ngtcp2_put_uint16(p, sa_in6->sin6_port);
+      } else {
+        p = ngtcp2_cpymem(p, empty_address, sizeof(sa_in6->sin6_addr));
+        p = ngtcp2_put_uint16(p, 0);
+      }
+
+      *p++ = (uint8_t)params->preferred_address.cid.datalen;
+      if (params->preferred_address.cid.datalen) {
+        p = ngtcp2_cpymem(p, params->preferred_address.cid.data,
+                          params->preferred_address.cid.datalen);
+      }
+      p = ngtcp2_cpymem(
+          p, params->preferred_address.stateless_reset_token,
+          sizeof(params->preferred_address.stateless_reset_token));
+    }
+    if (params->retry_scid_present) {
+      p = write_cid_param(p, NGTCP2_TRANSPORT_PARAM_RETRY_SOURCE_CONNECTION_ID,
+                          &params->retry_scid);
+    }
+  }
+
+  p = write_cid_param(p, NGTCP2_TRANSPORT_PARAM_INITIAL_SOURCE_CONNECTION_ID,
+                      &params->initial_scid);
+
+  if (params->initial_max_stream_data_bidi_local) {
+    p = write_varint_param(
+        p, NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAM_DATA_BIDI_LOCAL,
+        params->initial_max_stream_data_bidi_local);
+  }
+
+  if (params->initial_max_stream_data_bidi_remote) {
+    p = write_varint_param(
+        p, NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAM_DATA_BIDI_REMOTE,
+        params->initial_max_stream_data_bidi_remote);
+  }
+
+  if (params->initial_max_stream_data_uni) {
+    p = write_varint_param(p,
+                           NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAM_DATA_UNI,
+                           params->initial_max_stream_data_uni);
+  }
+
+  if (params->initial_max_data) {
+    p = write_varint_param(p, NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_DATA,
+                           params->initial_max_data);
+  }
+
+  if (params->initial_max_streams_bidi) {
+    p = write_varint_param(p, NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAMS_BIDI,
+                           params->initial_max_streams_bidi);
+  }
+
+  if (params->initial_max_streams_uni) {
+    p = write_varint_param(p, NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAMS_UNI,
+                           params->initial_max_streams_uni);
+  }
+
+  if (params->max_udp_payload_size !=
+      NGTCP2_DEFAULT_MAX_RECV_UDP_PAYLOAD_SIZE) {
+    p = write_varint_param(p, NGTCP2_TRANSPORT_PARAM_MAX_UDP_PAYLOAD_SIZE,
+                           params->max_udp_payload_size);
+  }
+
+  if (params->ack_delay_exponent != NGTCP2_DEFAULT_ACK_DELAY_EXPONENT) {
+    p = write_varint_param(p, NGTCP2_TRANSPORT_PARAM_ACK_DELAY_EXPONENT,
+                           params->ack_delay_exponent);
+  }
+
+  if (params->disable_active_migration) {
+    p = ngtcp2_put_uvarint(p, NGTCP2_TRANSPORT_PARAM_DISABLE_ACTIVE_MIGRATION);
+    p = ngtcp2_put_uvarint(p, 0);
+  }
+
+  if (params->max_ack_delay != NGTCP2_DEFAULT_MAX_ACK_DELAY) {
+    p = write_varint_param(p, NGTCP2_TRANSPORT_PARAM_MAX_ACK_DELAY,
+                           params->max_ack_delay / NGTCP2_MILLISECONDS);
+  }
+
+  if (params->max_idle_timeout) {
+    p = write_varint_param(p, NGTCP2_TRANSPORT_PARAM_MAX_IDLE_TIMEOUT,
+                           params->max_idle_timeout / NGTCP2_MILLISECONDS);
+  }
+
+  if (params->active_connection_id_limit &&
+      params->active_connection_id_limit !=
+          NGTCP2_DEFAULT_ACTIVE_CONNECTION_ID_LIMIT) {
+    p = write_varint_param(p, NGTCP2_TRANSPORT_PARAM_ACTIVE_CONNECTION_ID_LIMIT,
+                           params->active_connection_id_limit);
+  }
+
+  if (params->max_datagram_frame_size) {
+    p = write_varint_param(p, NGTCP2_TRANSPORT_PARAM_MAX_DATAGRAM_FRAME_SIZE,
+                           params->max_datagram_frame_size);
+  }
+
+  if (params->grease_quic_bit) {
+    p = ngtcp2_put_uvarint(p, NGTCP2_TRANSPORT_PARAM_GREASE_QUIC_BIT);
+    p = ngtcp2_put_uvarint(p, 0);
+  }
+
+  if (params->version_info_present) {
+    p = ngtcp2_put_uvarint(p, NGTCP2_TRANSPORT_PARAM_VERSION_INFORMATION_DRAFT);
+    p = ngtcp2_put_uvarint(p, version_infolen);
+    p = ngtcp2_put_uint32be(p, params->version_info.chosen_version);
+    if (params->version_info.other_versionslen) {
+      p = ngtcp2_cpymem(p, params->version_info.other_versions,
+                        params->version_info.other_versionslen);
+    }
+  }
+
+  assert((size_t)(p - dest) == len);
+
+  return (ngtcp2_ssize)len;
+}
+
+/*
+ * decode_varint decodes a single varint from the buffer pointed by
+ * |*pp| of length |end - *pp|.  If it decodes an integer
+ * successfully, it stores the integer in |*pdest|, increment |*pp| by
+ * the number of bytes read from |*pp|, and returns 0.  Otherwise it
+ * returns -1.
+ */
+static int decode_varint(uint64_t *pdest, const uint8_t **pp,
+                         const uint8_t *end) {
+  const uint8_t *p = *pp;
+  size_t len;
+
+  if (p == end) {
+    return -1;
+  }
+
+  len = ngtcp2_get_uvarintlen(p);
+  if ((uint64_t)(end - p) < len) {
+    return -1;
+  }
+
+  *pp = ngtcp2_get_uvarint(pdest, p);
+
+  return 0;
+}
+
+/*
+ * decode_varint_param decodes length prefixed value from the buffer
+ * pointed by |*pp| of length |end - *pp|.  The length and value are
+ * encoded in varint form.  If it decodes a value successfully, it
+ * stores the value in |*pdest|, increment |*pp| by the number of
+ * bytes read from |*pp|, and returns 0.  Otherwise it returns -1.
+ */
+static int decode_varint_param(uint64_t *pdest, const uint8_t **pp,
+                               const uint8_t *end) {
+  const uint8_t *p = *pp;
+  uint64_t valuelen;
+
+  if (decode_varint(&valuelen, &p, end) != 0) {
+    return -1;
+  }
+
+  if (p == end) {
+    return -1;
+  }
+
+  if ((uint64_t)(end - p) < valuelen) {
+    return -1;
+  }
+
+  if (ngtcp2_get_uvarintlen(p) != valuelen) {
+    return -1;
+  }
+
+  *pp = ngtcp2_get_uvarint(pdest, p);
+
+  return 0;
+}
+
+/*
+ * decode_cid_param decodes length prefixed ngtcp2_cid from the buffer
+ * pointed by |*pp| of length |end - *pp|.  The length is encoded in
+ * varint form.  If it decodes a value successfully, it stores the
+ * value in |*pdest|, increment |*pp| by the number of read from
+ * |*pp|, and returns the number of bytes read.  Otherwise it returns
+ * the one of the negative error code:
+ *
+ * NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM
+ *     Could not decode Connection ID.
+ */
+static int decode_cid_param(ngtcp2_cid *pdest, const uint8_t **pp,
+                            const uint8_t *end) {
+  const uint8_t *p = *pp;
+  uint64_t valuelen;
+
+  if (decode_varint(&valuelen, &p, end) != 0) {
+    return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+  }
+
+  if ((valuelen != 0 && valuelen < NGTCP2_MIN_CIDLEN) ||
+      valuelen > NGTCP2_MAX_CIDLEN || (size_t)(end - p) < valuelen) {
+    return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+  }
+
+  ngtcp2_cid_init(pdest, p, (size_t)valuelen);
+
+  p += valuelen;
+
+  *pp = p;
+
+  return 0;
+}
+
+int ngtcp2_decode_transport_params_versioned(
+    int transport_params_version, ngtcp2_transport_params *params,
+    ngtcp2_transport_params_type exttype, const uint8_t *data, size_t datalen) {
+  const uint8_t *p, *end, *lend;
+  size_t len;
+  uint64_t param_type;
+  uint64_t valuelen;
+  int rv;
+  int initial_scid_present = 0;
+  int original_dcid_present = 0;
+  ngtcp2_sockaddr_in *sa_in;
+  ngtcp2_sockaddr_in6 *sa_in6;
+  uint32_t version;
+
+  (void)transport_params_version;
+
+  if (datalen == 0) {
+    return NGTCP2_ERR_REQUIRED_TRANSPORT_PARAM;
+  }
+
+  /* Set default values */
+  memset(params, 0, sizeof(*params));
+  params->initial_max_streams_bidi = 0;
+  params->initial_max_streams_uni = 0;
+  params->initial_max_stream_data_bidi_local = 0;
+  params->initial_max_stream_data_bidi_remote = 0;
+  params->initial_max_stream_data_uni = 0;
+  params->max_udp_payload_size = NGTCP2_DEFAULT_MAX_RECV_UDP_PAYLOAD_SIZE;
+  params->ack_delay_exponent = NGTCP2_DEFAULT_ACK_DELAY_EXPONENT;
+  params->stateless_reset_token_present = 0;
+  params->preferred_address_present = 0;
+  params->disable_active_migration = 0;
+  params->max_ack_delay = NGTCP2_DEFAULT_MAX_ACK_DELAY;
+  params->max_idle_timeout = 0;
+  params->active_connection_id_limit =
+      NGTCP2_DEFAULT_ACTIVE_CONNECTION_ID_LIMIT;
+  params->retry_scid_present = 0;
+  params->max_datagram_frame_size = 0;
+  memset(&params->retry_scid, 0, sizeof(params->retry_scid));
+  memset(&params->initial_scid, 0, sizeof(params->initial_scid));
+  memset(&params->original_dcid, 0, sizeof(params->original_dcid));
+  params->version_info_present = 0;
+
+  p = data;
+  end = data + datalen;
+
+  for (; (size_t)(end - p) >= 2;) {
+    if (decode_varint(&param_type, &p, end) != 0) {
+      return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+    }
+
+    switch (param_type) {
+    case NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAM_DATA_BIDI_LOCAL:
+      if (decode_varint_param(&params->initial_max_stream_data_bidi_local, &p,
+                              end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      break;
+    case NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAM_DATA_BIDI_REMOTE:
+      if (decode_varint_param(&params->initial_max_stream_data_bidi_remote, &p,
+                              end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      break;
+    case NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAM_DATA_UNI:
+      if (decode_varint_param(&params->initial_max_stream_data_uni, &p, end) !=
+          0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      break;
+    case NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_DATA:
+      if (decode_varint_param(&params->initial_max_data, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      break;
+    case NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAMS_BIDI:
+      if (decode_varint_param(&params->initial_max_streams_bidi, &p, end) !=
+          0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (params->initial_max_streams_bidi > NGTCP2_MAX_STREAMS) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      break;
+    case NGTCP2_TRANSPORT_PARAM_INITIAL_MAX_STREAMS_UNI:
+      if (decode_varint_param(&params->initial_max_streams_uni, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (params->initial_max_streams_uni > NGTCP2_MAX_STREAMS) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      break;
+    case NGTCP2_TRANSPORT_PARAM_MAX_IDLE_TIMEOUT:
+      if (decode_varint_param(&params->max_idle_timeout, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      params->max_idle_timeout *= NGTCP2_MILLISECONDS;
+      break;
+    case NGTCP2_TRANSPORT_PARAM_MAX_UDP_PAYLOAD_SIZE:
+      if (decode_varint_param(&params->max_udp_payload_size, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      break;
+    case NGTCP2_TRANSPORT_PARAM_STATELESS_RESET_TOKEN:
+      if (exttype != NGTCP2_TRANSPORT_PARAMS_TYPE_ENCRYPTED_EXTENSIONS) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (decode_varint(&valuelen, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if ((size_t)valuelen != sizeof(params->stateless_reset_token)) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if ((size_t)(end - p) < sizeof(params->stateless_reset_token)) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+
+      p = ngtcp2_get_bytes(params->stateless_reset_token, p,
+                           sizeof(params->stateless_reset_token));
+      params->stateless_reset_token_present = 1;
+
+      break;
+    case NGTCP2_TRANSPORT_PARAM_ACK_DELAY_EXPONENT:
+      if (decode_varint_param(&params->ack_delay_exponent, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (params->ack_delay_exponent > 20) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      break;
+    case NGTCP2_TRANSPORT_PARAM_PREFERRED_ADDRESS:
+      if (exttype != NGTCP2_TRANSPORT_PARAMS_TYPE_ENCRYPTED_EXTENSIONS) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (decode_varint(&valuelen, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if ((size_t)(end - p) < valuelen) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      len = 4 /* ipv4Address */ + 2 /* ipv4Port */ + 16 /* ipv6Address */ +
+            2 /* ipv6Port */
+            + 1 /* cid length */ + NGTCP2_STATELESS_RESET_TOKENLEN;
+      if (valuelen < len) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+
+      sa_in = &params->preferred_address.ipv4;
+
+      p = ngtcp2_get_bytes(&sa_in->sin_addr, p, sizeof(sa_in->sin_addr));
+      p = ngtcp2_get_uint16be(&sa_in->sin_port, p);
+
+      if (sa_in->sin_port || memcmp(empty_address, &sa_in->sin_addr,
+                                    sizeof(sa_in->sin_addr)) != 0) {
+        sa_in->sin_family = AF_INET;
+        params->preferred_address.ipv4_present = 1;
+      }
+
+      sa_in6 = &params->preferred_address.ipv6;
+
+      p = ngtcp2_get_bytes(&sa_in6->sin6_addr, p, sizeof(sa_in6->sin6_addr));
+      p = ngtcp2_get_uint16be(&sa_in6->sin6_port, p);
+
+      if (sa_in6->sin6_port || memcmp(empty_address, &sa_in6->sin6_addr,
+                                      sizeof(sa_in6->sin6_addr)) != 0) {
+        sa_in6->sin6_family = AF_INET6;
+        params->preferred_address.ipv6_present = 1;
+      }
+
+      /* cid */
+      params->preferred_address.cid.datalen = *p++;
+      len += params->preferred_address.cid.datalen;
+      if (valuelen != len ||
+          params->preferred_address.cid.datalen > NGTCP2_MAX_CIDLEN ||
+          params->preferred_address.cid.datalen < NGTCP2_MIN_CIDLEN) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (params->preferred_address.cid.datalen) {
+        p = ngtcp2_get_bytes(params->preferred_address.cid.data, p,
+                             params->preferred_address.cid.datalen);
+      }
+
+      /* stateless reset token */
+      p = ngtcp2_get_bytes(
+          params->preferred_address.stateless_reset_token, p,
+          sizeof(params->preferred_address.stateless_reset_token));
+      params->preferred_address_present = 1;
+      break;
+    case NGTCP2_TRANSPORT_PARAM_DISABLE_ACTIVE_MIGRATION:
+      if (decode_varint(&valuelen, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (valuelen != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      params->disable_active_migration = 1;
+      break;
+    case NGTCP2_TRANSPORT_PARAM_ORIGINAL_DESTINATION_CONNECTION_ID:
+      if (exttype != NGTCP2_TRANSPORT_PARAMS_TYPE_ENCRYPTED_EXTENSIONS) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      rv = decode_cid_param(&params->original_dcid, &p, end);
+      if (rv != 0) {
+        return rv;
+      }
+      original_dcid_present = 1;
+      break;
+    case NGTCP2_TRANSPORT_PARAM_RETRY_SOURCE_CONNECTION_ID:
+      if (exttype != NGTCP2_TRANSPORT_PARAMS_TYPE_ENCRYPTED_EXTENSIONS) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      rv = decode_cid_param(&params->retry_scid, &p, end);
+      if (rv != 0) {
+        return rv;
+      }
+      params->retry_scid_present = 1;
+      break;
+    case NGTCP2_TRANSPORT_PARAM_INITIAL_SOURCE_CONNECTION_ID:
+      rv = decode_cid_param(&params->initial_scid, &p, end);
+      if (rv != 0) {
+        return rv;
+      }
+      initial_scid_present = 1;
+      break;
+    case NGTCP2_TRANSPORT_PARAM_MAX_ACK_DELAY:
+      if (decode_varint_param(&params->max_ack_delay, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (params->max_ack_delay >= 16384) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      params->max_ack_delay *= NGTCP2_MILLISECONDS;
+      break;
+    case NGTCP2_TRANSPORT_PARAM_ACTIVE_CONNECTION_ID_LIMIT:
+      if (decode_varint_param(&params->active_connection_id_limit, &p, end) !=
+          0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      break;
+    case NGTCP2_TRANSPORT_PARAM_MAX_DATAGRAM_FRAME_SIZE:
+      if (decode_varint_param(&params->max_datagram_frame_size, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      break;
+    case NGTCP2_TRANSPORT_PARAM_GREASE_QUIC_BIT:
+      if (decode_varint(&valuelen, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (valuelen != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      params->grease_quic_bit = 1;
+      break;
+    case NGTCP2_TRANSPORT_PARAM_VERSION_INFORMATION_DRAFT:
+      if (decode_varint(&valuelen, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if ((size_t)(end - p) < valuelen) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (valuelen < sizeof(uint32_t) || (valuelen & 0x3)) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      p = ngtcp2_get_uint32(&params->version_info.chosen_version, p);
+      if (params->version_info.chosen_version == 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if (valuelen > sizeof(uint32_t)) {
+        params->version_info.other_versions = (uint8_t *)p;
+        params->version_info.other_versionslen =
+            (size_t)valuelen - sizeof(uint32_t);
+
+        for (lend = p + (valuelen - sizeof(uint32_t)); p != lend;) {
+          p = ngtcp2_get_uint32(&version, p);
+          if (version == 0) {
+            return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+          }
+        }
+      }
+      params->version_info_present = 1;
+      break;
+    default:
+      /* Ignore unknown parameter */
+      if (decode_varint(&valuelen, &p, end) != 0) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      if ((size_t)(end - p) < valuelen) {
+        return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+      }
+      p += valuelen;
+      break;
+    }
+  }
+
+  if (end - p != 0) {
+    return NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM;
+  }
+
+  if (!initial_scid_present ||
+      (exttype == NGTCP2_TRANSPORT_PARAMS_TYPE_ENCRYPTED_EXTENSIONS &&
+       !original_dcid_present)) {
+    return NGTCP2_ERR_REQUIRED_TRANSPORT_PARAM;
+  }
+
+  return 0;
+}
+
+static int transport_params_copy_new(ngtcp2_transport_params **pdest,
+                                     const ngtcp2_transport_params *src,
+                                     const ngtcp2_mem *mem) {
+  size_t len = sizeof(**pdest);
+  ngtcp2_transport_params *dest;
+  uint8_t *p;
+
+  if (src->version_info_present) {
+    len += src->version_info.other_versionslen;
+  }
+
+  dest = ngtcp2_mem_malloc(mem, len);
+  if (dest == NULL) {
+    return NGTCP2_ERR_NOMEM;
+  }
+
+  *dest = *src;
+
+  if (src->version_info_present && src->version_info.other_versionslen) {
+    p = (uint8_t *)dest + sizeof(*dest);
+    memcpy(p, src->version_info.other_versions,
+           src->version_info.other_versionslen);
+    dest->version_info.other_versions = p;
+  }
+
+  *pdest = dest;
+
+  return 0;
+}
+
+int ngtcp2_decode_transport_params_new(ngtcp2_transport_params **pparams,
+                                       ngtcp2_transport_params_type exttype,
+                                       const uint8_t *data, size_t datalen,
+                                       const ngtcp2_mem *mem) {
+  int rv;
+  ngtcp2_transport_params params;
+
+  rv = ngtcp2_decode_transport_params(&params, exttype, data, datalen);
+  if (rv < 0) {
+    return rv;
+  }
+
+  if (mem == NULL) {
+    mem = ngtcp2_mem_default();
+  }
+
+  return transport_params_copy_new(pparams, &params, mem);
+}
+
+void ngtcp2_transport_params_del(ngtcp2_transport_params *params,
+                                 const ngtcp2_mem *mem) {
+  if (params == NULL) {
+    return;
+  }
+
+  if (mem == NULL) {
+    mem = ngtcp2_mem_default();
+  }
+
+  ngtcp2_mem_free(mem, params);
+}
+
+int ngtcp2_transport_params_copy_new(ngtcp2_transport_params **pdest,
+                                     const ngtcp2_transport_params *src,
+                                     const ngtcp2_mem *mem) {
+  if (src == NULL) {
+    *pdest = NULL;
+    return 0;
+  }
+
+  return transport_params_copy_new(pdest, src, mem);
+}