transport_types.h

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/*
 * Copyright (c) 2016-2019 Cisco and/or its affiliates.
 * 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.
 */

#ifndef VNET_VNET_URI_TRANSPORT_TYPES_H_
#define VNET_VNET_URI_TRANSPORT_TYPES_H_

#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/tcp/tcp_debug.h>
#include <vppinfra/bihash_24_8.h>


#define TRANSPORT_MAX_HDRS_LEN    140   /* Max number of bytes for headers */


typedef enum transport_dequeue_type_
{
  TRANSPORT_TX_PEEK,            /**< reliable transport protos */
  TRANSPORT_TX_DEQUEUE,         /**< unreliable transport protos */
  TRANSPORT_TX_INTERNAL,        /**< apps acting as transports */
  TRANSPORT_TX_DGRAM,           /**< datagram mode */
  TRANSPORT_TX_N_FNS
} transport_tx_fn_type_t;

typedef enum transport_service_type_
{
  TRANSPORT_SERVICE_VC,         /**< virtual circuit service */
  TRANSPORT_SERVICE_CL,         /**< connectionless service */
  TRANSPORT_SERVICE_APP,        /**< app transport service */
  TRANSPORT_N_SERVICES
} transport_service_type_t;

typedef enum transport_connection_flags_
{
  TRANSPORT_CONNECTION_F_IS_TX_PACED = 1 << 0,
  /**
   * Don't register connection in lookup. Does not apply to local apps
   * and transports using the network layer (udp/tcp)
   */
  TRANSPORT_CONNECTION_F_NO_LOOKUP = 1 << 1,
  /**
   * Connection descheduled by the session layer.
   */
  TRANSPORT_CONNECTION_F_DESCHED = 1 << 2,
  /**
   * Connection is "connection less". Some important implications of that
   * are that connections are not pinned to workers and listeners will
   * have fifos associated to them
   */
  TRANSPORT_CONNECTION_F_CLESS = 1 << 3,
} transport_connection_flags_t;

typedef struct _spacer
{
  u64 bytes_per_sec;
  i64 bucket;
  clib_us_time_t last_update;
  f32 tokens_per_period;
  u32 max_burst;
} spacer_t;

#define TRANSPORT_CONN_ID_LEN   44

/*
 * Protocol independent transport properties associated to a session
 */
typedef struct _transport_connection
{
  /** Connection ID */
  union
  {
    /*
     * Network connection ID tuple
     */
    struct
    {
      ip46_address_t rmt_ip;    /**< Remote IP */
      ip46_address_t lcl_ip;    /**< Local IP */
      u32 fib_index;            /**< Network namespace */
      u16 rmt_port;             /**< Remote port */
      u16 lcl_port;             /**< Local port */
      u8 is_ip4;                /**< Flag if IP4 connection */
      u8 proto;                 /**< Protocol id */
      u8 unused[2];             /**< First field after id wants to be
                                     4-byte aligned) */
    };
    /*
     * Opaque connection ID
     */
    u8 opaque_conn_id[TRANSPORT_CONN_ID_LEN];
  };

  u32 s_index;                  /**< Parent session index */
  u32 c_index;                  /**< Connection index in transport pool */
  u32 thread_index;             /**< Worker-thread index */
  u8 flags;                     /**< Transport specific flags */

  /*fib_node_index_t rmt_fei;
     dpo_id_t rmt_dpo; */

  spacer_t pacer;               /**< Simple transport pacer */

#if TRANSPORT_DEBUG
  elog_track_t elog_track;      /**< Event logging */
  u32 cc_stat_tstamp;           /**< CC stats timestamp */
#endif

  /**
   * Transport specific state starts in next cache line. Meant to avoid
   * alignment surprises in transports when base class changes.
   */
    CLIB_CACHE_LINE_ALIGN_MARK (end);

  /** Macros for 'derived classes' where base is named "connection" */
#define c_lcl_ip connection.lcl_ip
#define c_rmt_ip connection.rmt_ip
#define c_lcl_ip4 connection.lcl_ip.ip4
#define c_rmt_ip4 connection.rmt_ip.ip4
#define c_lcl_ip6 connection.lcl_ip.ip6
#define c_rmt_ip6 connection.rmt_ip.ip6
#define c_lcl_port connection.lcl_port
#define c_rmt_port connection.rmt_port
#define c_proto connection.proto
#define c_fib_index connection.fib_index
#define c_s_index connection.s_index
#define c_c_index connection.c_index
#define c_is_ip4 connection.is_ip4
#define c_thread_index connection.thread_index
#define c_elog_track connection.elog_track
#define c_cc_stat_tstamp connection.cc_stat_tstamp
#define c_rmt_fei connection.rmt_fei
#define c_rmt_dpo connection.rmt_dpo
#define c_opaque_id connection.opaque_conn_id
#define c_stats connection.stats
#define c_pacer connection.pacer
#define c_flags connection.flags
#define s_ho_handle pacer.bytes_per_sec
#define c_s_ho_handle connection.pacer.bytes_per_sec
} transport_connection_t;

STATIC_ASSERT (STRUCT_OFFSET_OF (transport_connection_t, s_index)
               == TRANSPORT_CONN_ID_LEN, "update conn id len");

/* Warn if size changes. Two cache lines is already generous, hopefully we
 * won't have to outgrow that. */
STATIC_ASSERT (sizeof (transport_connection_t) <= 128,
               "moved into 3rd cache line");

#define foreach_transport_proto                         \
  _(TCP, "tcp", "T")                                    \
  _(UDP, "udp", "U")                                    \
  _(NONE, "ct", "C")                                    \
  _(TLS, "tls", "J")                                    \
  _(QUIC, "quic", "Q")                                  \

typedef enum _transport_proto
{
#define _(sym, str, sstr) TRANSPORT_PROTO_ ## sym,
  foreach_transport_proto
#undef _
} transport_proto_t;

u8 *format_transport_proto (u8 * s, va_list * args);
u8 *format_transport_proto_short (u8 * s, va_list * args);
u8 *format_transport_connection (u8 * s, va_list * args);
u8 *format_transport_listen_connection (u8 * s, va_list * args);
u8 *format_transport_half_open_connection (u8 * s, va_list * args);

uword unformat_transport_proto (unformat_input_t * input, va_list * args);
u8 *format_transport_protos (u8 * s, va_list * args);

#define foreach_transport_endpoint_fields                               \
  _(ip46_address_t, ip) /**< ip address in net order */                 \
  _(u16, port)          /**< port in net order */                       \
  _(u8, is_ip4)         /**< set if ip4 */                              \
  _(u32, sw_if_index)   /**< interface endpoint is associated with  */  \
  _(u32, fib_index)     /**< fib table endpoint is associated with */   \

typedef struct transport_endpoint_
{
#define _(type, name) type name;
  foreach_transport_endpoint_fields
#undef _
} transport_endpoint_t;

typedef enum transport_endpt_cfg_flags_
{
  TRANSPORT_CFG_F_CONNECTED = 1 << 0,
  TRANSPORT_CFG_F_UNIDIRECTIONAL = 1 << 1,
} transport_endpt_cfg_flags_t;

#define foreach_transport_endpoint_cfg_fields                           \
  foreach_transport_endpoint_fields                                     \
  _(transport_endpoint_t, peer)                                         \
  _(u16, mss)                                                           \
  _(u8, transport_flags)                                                \

typedef struct transport_endpoint_pair_
{
#define _(type, name) type name;
  foreach_transport_endpoint_cfg_fields
#undef _
} transport_endpoint_cfg_t;

typedef clib_bihash_24_8_t transport_endpoint_table_t;

#define ENDPOINT_INVALID_INDEX ((u32)~0)

always_inline u8
transport_connection_fib_proto (transport_connection_t * tc)
{
  return tc->is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
}

always_inline u8
transport_endpoint_fib_proto (transport_endpoint_t * tep)
{
  return tep->is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
}

u8 transport_protocol_is_cl (transport_proto_t tp);
transport_service_type_t transport_protocol_service_type (transport_proto_t);
transport_tx_fn_type_t transport_protocol_tx_fn_type (transport_proto_t tp);

#endif /* VNET_VNET_URI_TRANSPORT_TYPES_H_ */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */