/*
 * 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.
 */

#include <vppinfra/socket.h>
#include <vnet/vnet.h>
#include <vnet/session/session_table.h>

#ifndef SRC_VNET_SESSION_APPLICATION_NAMESPACE_H_
#define SRC_VNET_SESSION_APPLICATION_NAMESPACE_H_

typedef struct _app_namespace
{
  /**
   * Local sw_if_index that supports transport connections for this namespace
   */
  u32 sw_if_index;

  /**
   * Network namespace (e.g., fib_index associated to the sw_if_index)
   * wherein connections are to be established. Since v4 and v6 fibs are
   * separate, we actually need to keep pointers to both.
   */
  u32 ip4_fib_index;
  u32 ip6_fib_index;

  /**
   * Local session table associated to ns
   */
  u32 local_table_index;

  /**
   * Secret apps need to provide to authorize attachment to the namespace
   */
  u64 ns_secret;

  /**
   * Application namespace id
   */
  u8 *ns_id;

  /**
   * Linux netns if one was provided
   */
  u8 *netns;

  /**
   * Name of socket applications can use to attach to session layer
   */
  u8 *sock_name;

  /**
   * Pool of active application sockets
   */
  clib_socket_t *app_sockets;
} app_namespace_t;

typedef struct _vnet_app_namespace_add_del_args
{
  u8 *ns_id;
  u8 *netns;
  u8 *sock_name;
  u64 secret;
  u32 sw_if_index;
  u32 ip4_fib_id;
  u32 ip6_fib_id;
  u8 is_add;
} vnet_app_namespace_add_del_args_t;

#define APP_NAMESPACE_INVALID_INDEX ((u32)~0)

app_namespace_t *app_namespace_alloc (const u8 *ns_id);
app_namespace_t *app_namespace_get (u32 index);
app_namespace_t *app_namespace_get_from_id (const u8 *ns_id);
u32 app_namespace_index (app_namespace_t * app_ns);
const u8 *app_namespace_id (app_namespace_t * app_ns);
const u8 *app_namespace_id_from_index (u32 index);
u32 app_namespace_index_from_id (const u8 *ns_id);
void app_namespaces_init (void);
int vnet_app_namespace_add_del (vnet_app_namespace_add_del_args_t * a);
u32 app_namespace_get_fib_index (app_namespace_t * app_ns, u8 fib_proto);
session_table_t *app_namespace_get_local_table (app_namespace_t * app_ns);

always_inline app_namespace_t *
app_namespace_get_default (void)
{
  return app_namespace_get (0);
}

typedef struct app_ns_api_handle_
{
  union
  {
    struct
    {
      /** app_ns index for files and app_index for sockets */
      u32 l_index;
      /** socket index for files and clib file index for sockets */
      u32 u_index;
    };
    u64 as_u64;
  };
#define aah_app_ns_index l_index
#define aah_app_wrk_index l_index
#define aah_sock_index u_index
#define aah_file_index u_index
} __attribute__ ((aligned (sizeof (u64)))) app_ns_api_handle_t;

STATIC_ASSERT (sizeof (app_ns_api_handle_t) == sizeof (u64), "not u64");

static inline clib_socket_t *
appns_sapi_alloc_socket (app_namespace_t * app_ns)
{
  clib_socket_t *cs;
  pool_get_zero (app_ns->app_sockets, cs);
  return cs;
}

static inline clib_socket_t *
appns_sapi_get_socket (app_namespace_t * app_ns, u32 sock_index)
{
  if (pool_is_free_index (app_ns->app_sockets, sock_index))
    return 0;
  return pool_elt_at_index (app_ns->app_sockets, sock_index);
}

static inline void
appns_sapi_free_socket (app_namespace_t * app_ns, clib_socket_t * cs)
{
  pool_put (app_ns->app_sockets, cs);
}

static inline u32
appns_sapi_socket_index (app_namespace_t * app_ns, clib_socket_t * cs)
{
  return (cs - app_ns->app_sockets);
}

static inline u32
appns_sapi_socket_handle (app_namespace_t * app_ns, clib_socket_t * cs)
{
  return app_namespace_index (app_ns) << 16 | (cs - app_ns->app_sockets);
}

static inline u32
appns_sapi_handle_sock_index (u32 sapi_sock_handle)
{
  return sapi_sock_handle & 0xffff;
}

int appns_sapi_add_ns_socket (app_namespace_t * app_ns);
void appns_sapi_del_ns_socket (app_namespace_t *app_ns);
u8 appns_sapi_enabled (void);
void appns_sapi_enable (void);

#endif /* SRC_VNET_SESSION_APPLICATION_NAMESPACE_H_ */

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