/*
 * Copyright (c) 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 <vlib/vlib.h>

#include <netlink/route/link.h>
#include <netlink/route/route.h>
#include <netlink/route/neighbour.h>
#include <netlink/route/addr.h>

typedef void (*nl_rt_link_cb_t) (struct rtnl_link *rl, void *ctx);
typedef void (*nl_rt_link_sync_cb_t) (void);
typedef void (*nl_rt_addr_cb_t) (struct rtnl_addr *ra);
typedef void (*nl_rt_addr_sync_cb_t) (void);
typedef void (*nl_rt_neigh_cb_t) (struct rtnl_neigh *rr);
typedef void (*nl_rt_neigh_sync_cb_t) (void);
typedef void (*nl_rt_route_add_cb_t) (struct rtnl_route *rn, int is_replace);
typedef void (*nl_rt_route_del_cb_t) (struct rtnl_route *rn);
typedef void (*nl_rt_route_sync_cb_t) (void);

#define NL_RT_COMMON uword is_mp_safe

typedef struct nl_rt_link_t_
{
  NL_RT_COMMON;

  nl_rt_link_cb_t cb;
} nl_rt_link_t;

typedef struct nl_rt_link_sync_t_
{
  NL_RT_COMMON;

  nl_rt_link_sync_cb_t cb;
} nl_rt_link_sync_t;

typedef struct nl_rt_addr_t_
{
  NL_RT_COMMON;

  nl_rt_addr_cb_t cb;
} nl_rt_addr_t;

typedef struct nl_rt_addr_sync_t_
{
  NL_RT_COMMON;

  nl_rt_addr_sync_cb_t cb;
} nl_rt_addr_sync_t;

typedef struct nl_rt_neigh_t_
{
  NL_RT_COMMON;

  nl_rt_neigh_cb_t cb;
} nl_rt_neigh_t;

typedef struct nl_rt_neigh_sync_t_
{
  NL_RT_COMMON;

  nl_rt_neigh_sync_cb_t cb;
} nl_rt_neigh_sync_t;

typedef struct nl_rt_route_add_t_
{
  NL_RT_COMMON;

  nl_rt_route_add_cb_t cb;
} nl_rt_route_add_t;

typedef struct nl_rt_route_del_t_
{
  NL_RT_COMMON;

  nl_rt_route_del_cb_t cb;
} nl_rt_route_del_t;

typedef struct nl_rt_route_sync_t_
{
  NL_RT_COMMON;

  nl_rt_route_sync_cb_t cb;
} nl_rt_route_sync_t;

#undef NL_RT_COMMON

typedef struct nl_vft_t_
{
  nl_rt_link_t nvl_rt_link_add;
  nl_rt_link_t nvl_rt_link_del;
  nl_rt_link_sync_t nvl_rt_link_sync_begin;
  nl_rt_link_sync_t nvl_rt_link_sync_end;
  nl_rt_addr_t nvl_rt_addr_add;
  nl_rt_addr_t nvl_rt_addr_del;
  nl_rt_addr_sync_t nvl_rt_addr_sync_begin;
  nl_rt_addr_sync_t nvl_rt_addr_sync_end;
  nl_rt_neigh_t nvl_rt_neigh_add;
  nl_rt_neigh_t nvl_rt_neigh_del;
  nl_rt_neigh_sync_t nvl_rt_neigh_sync_begin;
  nl_rt_neigh_sync_t nvl_rt_neigh_sync_end;
  nl_rt_route_add_t nvl_rt_route_add;
  nl_rt_route_del_t nvl_rt_route_del;
  nl_rt_route_sync_t nvl_rt_route_sync_begin;
  nl_rt_route_sync_t nvl_rt_route_sync_end;
} nl_vft_t;

extern void nl_register_vft (const nl_vft_t *nv);

typedef enum lcp_nl_obj_t_
{
  LCP_NL_LINK,
  LCP_NL_ADDR,
  LCP_NL_NEIGH,
  LCP_NL_ROUTE,
} lcp_nl_obj_t;

/* struct type to hold context on the netlink message being processed.
 *
 * At creation of a pair, a tap/tun is created and configured to match its
 * corresponding hardware interface (MAC address, link state, MTU). Netlink
 * messages are sent announcing the creation and subsequent configuration.
 * We do not need to (and should not) act on those messages since applying
 * those same configurations again is unnecessary and can be disruptive. So
 * a timestamp for a message is stored and can be compared against the time
 * the interface came under linux-cp management in order to figure out
 * whether we should apply any configuration.
 */
typedef struct nl_msg_info
{
  struct nl_msg *msg;
  f64 ts;
} nl_msg_info_t;

#define LCP_NL_N_OBJS (LCP_NL_ROUTE + 1)

extern struct nl_cache *lcp_nl_get_cache (lcp_nl_obj_t t);
extern int lcp_nl_drain_messages (void);
extern void lcp_nl_set_buffer_size (u32 buf_size);
extern void lcp_nl_set_batch_size (u32 batch_size);
extern void lcp_nl_set_batch_delay (u32 batch_delay_ms);

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