1 files changed, 175 insertions, 0 deletions
diff --git a/lib/ngtcp2_cid.h b/lib/ngtcp2_cid.h
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+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2018 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.
+ */
+#ifndef NGTCP2_CID_H
+#define NGTCP2_CID_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <ngtcp2/ngtcp2.h>
+
+#include "ngtcp2_pq.h"
+#include "ngtcp2_path.h"
+
+/* NGTCP2_SCID_FLAG_NONE indicates that no flag is set. */
+#define NGTCP2_SCID_FLAG_NONE 0x00u
+/* NGTCP2_SCID_FLAG_USED indicates that a local endpoint observed that
+   a remote endpoint uses a particular Connection ID. */
+#define NGTCP2_SCID_FLAG_USED 0x01u
+/* NGTCP2_SCID_FLAG_RETIRED indicates that a particular Connection ID
+   is retired. */
+#define NGTCP2_SCID_FLAG_RETIRED 0x02u
+
+typedef struct ngtcp2_scid {
+  ngtcp2_pq_entry pe;
+  /* seq is the sequence number associated to the CID. */
+  uint64_t seq;
+  /* cid is a connection ID */
+  ngtcp2_cid cid;
+  /* retired_ts is the timestamp when peer tells that this CID is
+     retired. */
+  ngtcp2_tstamp retired_ts;
+  /* flags is the bitwise OR of zero or more of NGTCP2_SCID_FLAG_*. */
+  uint8_t flags;
+} ngtcp2_scid;
+
+/* NGTCP2_DCID_FLAG_NONE indicates that no flag is set. */
+#define NGTCP2_DCID_FLAG_NONE 0x00u
+/* NGTCP2_DCID_FLAG_PATH_VALIDATED indicates that an associated path
+   has been validated. */
+#define NGTCP2_DCID_FLAG_PATH_VALIDATED 0x01u
+/* NGTCP2_DCID_FLAG_TOKEN_PRESENT indicates that a stateless reset
+   token is set in token field. */
+#define NGTCP2_DCID_FLAG_TOKEN_PRESENT 0x02u
+
+typedef struct ngtcp2_dcid {
+  /* seq is the sequence number associated to the CID. */
+  uint64_t seq;
+  /* cid is a connection ID */
+  ngtcp2_cid cid;
+  /* path is a path which cid is bound to.  The addresses are zero
+     length if cid has not been bound to a particular path yet. */
+  ngtcp2_path_storage ps;
+  /* retired_ts is the timestamp when peer tells that this CID is
+     retired. */
+  ngtcp2_tstamp retired_ts;
+  /* bound_ts is the timestamp when this connection ID is bound to a
+     particular path.  It is only assigned when a connection ID is
+     used just for sending PATH_RESPONSE and is not zero-length. */
+  ngtcp2_tstamp bound_ts;
+  /* bytes_sent is the number of bytes sent to an associated path. */
+  uint64_t bytes_sent;
+  /* bytes_recv is the number of bytes received from an associated
+     path. */
+  uint64_t bytes_recv;
+  /* max_udp_payload_size is the maximum size of UDP payload that is
+     allowed to send to this path. */
+  size_t max_udp_payload_size;
+  /* flags is bitwise OR of zero or more of NGTCP2_DCID_FLAG_*. */
+  uint8_t flags;
+  /* token is a stateless reset token associated to this CID.
+     Actually, the stateless reset token is tied to the connection,
+     not to the particular connection ID. */
+  uint8_t token[NGTCP2_STATELESS_RESET_TOKENLEN];
+} ngtcp2_dcid;
+
+/* ngtcp2_cid_zero makes |cid| zero-length. */
+void ngtcp2_cid_zero(ngtcp2_cid *cid);
+
+/*
+ * ngtcp2_cid_less returns nonzero if |lhs| is lexicographical smaller
+ * than |rhs|.
+ */
+int ngtcp2_cid_less(const ngtcp2_cid *lhs, const ngtcp2_cid *rhs);
+
+/*
+ * ngtcp2_cid_empty returns nonzero if |cid| includes empty connection
+ * ID.
+ */
+int ngtcp2_cid_empty(const ngtcp2_cid *cid);
+
+/*
+ * ngtcp2_scid_init initializes |scid| with the given parameters.
+ */
+void ngtcp2_scid_init(ngtcp2_scid *scid, uint64_t seq, const ngtcp2_cid *cid);
+
+/*
+ * ngtcp2_scid_copy copies |src| into |dest|.
+ */
+void ngtcp2_scid_copy(ngtcp2_scid *dest, const ngtcp2_scid *src);
+
+/*
+ * ngtcp2_dcid_init initializes |dcid| with the given parameters.  If
+ * |token| is NULL, the function fills dcid->token it with 0.  |token|
+ * must be NGTCP2_STATELESS_RESET_TOKENLEN bytes long.
+ */
+void ngtcp2_dcid_init(ngtcp2_dcid *dcid, uint64_t seq, const ngtcp2_cid *cid,
+                      const uint8_t *token);
+
+/*
+ * ngtcp2_dcid_set_token sets |token| to |dcid|.  |token| must not be
+ * NULL and must be NGTCP2_STATELESS_RESET_TOKENLEN bytes long.
+ */
+void ngtcp2_dcid_set_token(ngtcp2_dcid *dcid, const uint8_t *token);
+
+/*
+ * ngtcp2_dcid_set_path sets |path| to |dcid|.  It sets
+ * max_udp_payload_size to the minimum UDP payload size supported
+ * by the IP protocol version.
+ */
+void ngtcp2_dcid_set_path(ngtcp2_dcid *dcid, const ngtcp2_path *path);
+
+/*
+ * ngtcp2_dcid_copy copies |src| into |dest|.
+ */
+void ngtcp2_dcid_copy(ngtcp2_dcid *dest, const ngtcp2_dcid *src);
+
+/*
+ * ngtcp2_dcid_copy_cid_token behaves like ngtcp2_dcid_copy, but it
+ * only copies cid, seq, and path.
+ */
+void ngtcp2_dcid_copy_cid_token(ngtcp2_dcid *dest, const ngtcp2_dcid *src);
+
+/*
+ * ngtcp2_dcid_verify_uniqueness verifies uniqueness of (|seq|, |cid|,
+ * |token|) tuple against |dcid|.
+ */
+int ngtcp2_dcid_verify_uniqueness(ngtcp2_dcid *dcid, uint64_t seq,
+                                  const ngtcp2_cid *cid, const uint8_t *token);
+
+/*
+ * ngtcp2_dcid_verify_stateless_reset_token verifies stateless reset
+ * token |token| against the one included in |dcid|.  This function
+ * returns 0 if the verification succeeds, or one of the following
+ * negative error codes:
+ *
+ * NGTCP2_ERR_INVALID_ARGUMENT
+ *     Tokens do not match; or |dcid| does not contain a token.
+ */
+int ngtcp2_dcid_verify_stateless_reset_token(const ngtcp2_dcid *dcid,
+                                             const uint8_t *token);
+
+#endif /* NGTCP2_CID_H */