/*
 * Copyright (c) 2017-2019 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 SRC_VNET_SESSION_SESSION_TABLE_H_
#define SRC_VNET_SESSION_SESSION_TABLE_H_

#include <vppinfra/bihash_16_8.h>
#include <vppinfra/bihash_48_8.h>

typedef struct _session_lookup_table
{
  /**
   * Lookup tables for established sessions and listeners
   */
  clib_bihash_16_8_t v4_session_hash;
  clib_bihash_48_8_t v6_session_hash;

  /**
   * Lookup tables for half-open sessions
   */
  clib_bihash_16_8_t v4_half_open_hash;
  clib_bihash_48_8_t v6_half_open_hash;

  /**
   * Per fib proto and transport proto session rules tables
   */
  u32 srtg_handle;

  /** Flag that indicates if table has local scope */
  u8 is_local;

  /** Namespace this table belongs to */
  u32 *appns_index;

  /** For global tables only one fib proto is active. This is a
   * byproduct of fib table ids not necessarily being the same for
   * identical fib idices of v4 and v6 fib protos */
  u8 active_fib_proto;
  /* Required for pool_get_aligned(...) */
    CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
} session_table_t;

#define SESSION_TABLE_INVALID_INDEX ((u32)~0)
#define SESSION_LOCAL_TABLE_PREFIX ((u32)~0)
#define SESSION_DROP_HANDLE (((u64)~0) - 1)

typedef int (*ip4_session_table_walk_fn_t) (clib_bihash_kv_16_8_t * kvp,
					    void *ctx);

void ip4_session_table_walk (clib_bihash_16_8_t * hash,
			     ip4_session_table_walk_fn_t fn, void *arg);

session_table_t *session_table_alloc (void);
session_table_t *session_table_get (u32 table_index);
u32 session_table_index (session_table_t * slt);
void session_table_init (session_table_t * slt, u8 fib_proto);
void session_table_free (session_table_t *slt, u8 fib_proto);

u32 session_table_memory_size (session_table_t *st);
u8 *format_session_table (u8 *s, va_list *args);

/* Internal, try not to use it! */
session_table_t *_get_session_tables ();

#define session_table_foreach(VAR, BODY)		\
  pool_foreach (VAR, _get_session_tables ()) BODY

void session_lookup_table_cleanup (u32 fib_proto, u32 fib_index, u32 ns_index);

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