/*
 *------------------------------------------------------------------
 * Copyright (c) 2018 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.
 *------------------------------------------------------------------
 */

#define _GNU_SOURCE
#include <stdlib.h>
#include <stdint.h>
#include <net/if.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/uio.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <inttypes.h>
#include <string.h>
#include <stdio.h>
#include <netdb.h>
#include <linux/ip.h>
#include <linux/icmp.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <netinet/if_ether.h>
#include <net/if_arp.h>
#include <asm/byteorder.h>
#include <byteswap.h>
#include <string.h>
#include <sys/epoll.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <pthread.h>
#include <time.h>

#ifndef TIME_UTC
#define TIME_UTC 1
#endif /* TIME_UTC */

#include <libmemif.h>
#include <icmp_proto.h>

#define APP_NAME	"ICMP_Responder"
#define IF_NAME		"memif_connection"

#ifdef ICMP_DBG
#define DBG(...) do {						\
			printf(APP_NAME":%s:%d",__func__,__LINE__);	\
			printf(__VA_ARGS__);				\
			printf("\n");					\
		} while (0)
#else
#define DBG(...)
#endif /* ICMP_DBG */

#define INFO(...) do {					\
			printf("INFO: "__VA_ARGS__);	\
			printf("\n");			\
		} while (0)

#define MAX_MEMIF_BUFS	256
#define MAX_CONNS	50


#ifndef __NR_memfd_create
#if defined __x86_64__
#define __NR_memfd_create 319
#elif defined __arm__
#define __NR_memfd_create 385
#elif defined __aarch64__
#define __NR_memfd_create 279
#else
#error "__NR_memfd_create unknown for this architecture"
#endif
#endif

#ifndef HAVE_MEMFD_CREATE
static inline int
memfd_create (const char *name, unsigned int flags)
{
  return syscall (__NR_memfd_create, name, flags);
}
#endif

#ifndef F_LINUX_SPECIFIC_BASE
#define F_LINUX_SPECIFIC_BASE 1024
#endif

#ifndef MFD_ALLOW_SEALING
#define MFD_ALLOW_SEALING       0x0002U
#endif

#ifndef F_ADD_SEALS
#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)

#define F_SEAL_SEAL     0x0001	/* prevent further seals from being set */
#define F_SEAL_SHRINK   0x0002	/* prevent file from shrinking */
#define F_SEAL_GROW     0x0004	/* prevent file from growing */
#define F_SEAL_WRITE    0x0008	/* prevent writes */
#endif

typedef struct
{
  uint16_t index;

  memif_conn_handle_t conn;

  uint16_t tx_buf_num;
  uint16_t rx_buf_num;
  memif_buffer_t *tx_bufs;
  memif_buffer_t *rx_bufs;

  uint8_t ip_addr[4];
  uint64_t tx_counter, rx_counter, tx_err_counter;
  uint64_t t_sec, t_nsec;
} memif_connection_t;

typedef struct
{
  uint16_t index;
  uint64_t packet_num;
  uint8_t ip_daddr[4];
  uint8_t hw_daddr[6];
} icmpr_thread_data_t;

icmpr_thread_data_t icmpr_thread_data[MAX_CONNS];
pthread_t thread[MAX_CONNS];
int epfd;
long ctx[MAX_CONNS];
memif_connection_t memif_connection[MAX_CONNS];

static void
print_help ()
{
  printf ("LIBMEMIF EXAMPLE APP: %s", APP_NAME);
#ifdef ICMP_DBG
  printf (" (debug)");
#endif
  printf ("\n");
  printf ("==============================\n");
  printf ("libmemif version: %s", LIBMEMIF_VERSION);
#ifdef MEMIF_DBG
  printf (" (debug)");
#endif
  printf ("\n");
  printf ("memif version: %d\n", memif_get_version ());
  printf ("commands:\n");
  printf ("\thelp - prints this help\n");
  printf ("\texit - exit app\n");
  printf
    ("\tconn <index> <mode> <interrupt> - create memif. index used as interface id. mode: 0 = slave | 1 = master. interrupt: none = default | 1 = handle ARP only\n");
  printf ("\tdel <index> - delete memif\n");
  printf ("\tshow - show connection details\n");
  printf ("\tsend <index> <tx> <ip> <mac> - send icmp\n");
}

static void
print_memif_details ()
{
  memif_details_t md;
  ssize_t buflen;
  char *buf;
  int err, i, e;
  buflen = 2048;
  buf = malloc (buflen);
  printf ("MEMIF DETAILS\n");
  printf ("==============================\n");
  for (i = 0; i < MAX_CONNS; i++)
    {
      memif_connection_t *c = &memif_connection[i];

      memset (&md, 0, sizeof (md));
      memset (buf, 0, buflen);

      err = memif_get_details (c->conn, &md, buf, buflen);
      if (err != MEMIF_ERR_SUCCESS)
	{
	  if (err != MEMIF_ERR_NOCONN)
	    INFO ("%s", memif_strerror (err));
	  continue;
	}

      printf ("interface index: %d\n", i);

      printf ("\tinterface ip: %u.%u.%u.%u\n",
	      c->ip_addr[0], c->ip_addr[1], c->ip_addr[2], c->ip_addr[3]);
      printf ("\tinterface name: %s\n", (char *) md.if_name);
      printf ("\tapp name: %s\n", (char *) md.inst_name);
      printf ("\tremote interface name: %s\n", (char *) md.remote_if_name);
      printf ("\tremote app name: %s\n", (char *) md.remote_inst_name);
      printf ("\tid: %u\n", md.id);
      printf ("\tsecret: %s\n", (char *) md.secret);
      printf ("\trole: ");
      if (md.role)
	printf ("slave\n");
      else
	printf ("master\n");
      printf ("\tmode: ");
      switch (md.mode)
	{
	case 0:
	  printf ("ethernet\n");
	  break;
	case 1:
	  printf ("ip\n");
	  break;
	case 2:
	  printf ("punt/inject\n");
	  break;
	default:
	  printf ("unknown\n");
	  break;
	}
      printf ("\tsocket filename: %s\n", (char *) md.socket_filename);
      printf ("\tregions:\n");
      for (e = 0; e < md.regions_num; e++)
	{
	  printf ("\t\tindex: %u\n", md.regions[e].index);
	  printf ("\t\taddress: %p\n", md.regions[e].addr);
	  printf ("\t\tsize: %u\n", md.regions[e].size);
	  printf ("\t\tfd: %d\n", md.regions[e].fd);
	  if (md.regions[e].is_external)
	    printf ("\t\texternal\n");
	}
      printf ("\trx queues:\n");
      for (e = 0; e < md.rx_queues_num; e++)
	{
	  printf ("\t\tqueue id: %u\n", md.rx_queues[e].qid);
	  printf ("\t\tring size: %u\n", md.rx_queues[e].ring_size);
	  printf ("\t\tring rx mode: %s\n",
		  md.rx_queues[e].flags ? "polling" : "interrupt");
	  printf ("\t\tring head: %u\n", md.rx_queues[e].head);
	  printf ("\t\tring tail: %u\n", md.rx_queues[e].tail);
	  printf ("\t\tbuffer size: %u\n", md.rx_queues[e].buffer_size);
	}
      printf ("\ttx queues:\n");
      for (e = 0; e < md.tx_queues_num; e++)
	{
	  printf ("\t\tqueue id: %u\n", md.tx_queues[e].qid);
	  printf ("\t\tring size: %u\n", md.tx_queues[e].ring_size);
	  printf ("\t\tring rx mode: %s\n",
		  md.tx_queues[e].flags ? "polling" : "interrupt");
	  printf ("\t\tring head: %u\n", md.tx_queues[e].head);
	  printf ("\t\tring tail: %u\n", md.tx_queues[e].tail);
	  printf ("\t\tbuffer size: %u\n", md.tx_queues[e].buffer_size);
	}
      printf ("\tlink: ");
      if (md.link_up_down)
	printf ("up\n");
      else
	printf ("down\n");
    }
  free (buf);
}

void
icmpr_print_counters ()
{
  int i;
  for (i = 0; i < MAX_CONNS; i++)
    {
      memif_connection_t *c = &memif_connection[i];
      if (c->conn == NULL)
	continue;
      printf ("===============================\n");
      printf ("interface index: %d\n", c->index);
      printf ("\trx: %lu\n", c->rx_counter);
      printf ("\ttx: %lu\n", c->tx_counter);
      printf ("\ttx_err: %lu\n", c->tx_err_counter);
    }
}

void
icmpr_reset_counters ()
{
  int i;
  for (i = 0; i < MAX_CONNS; i++)
    {
      memif_connection_t *c = &memif_connection[i];
      if (c->conn == NULL)
	continue;
      c->tx_err_counter = c->tx_counter = c->rx_counter = 0;
    }
}

int
add_epoll_fd (int fd, uint32_t events)
{
  if (fd < 0)
    {
      DBG ("invalid fd %d", fd);
      return -1;
    }
  struct epoll_event evt;
  memset (&evt, 0, sizeof (evt));
  evt.events = events;
  evt.data.fd = fd;
  if (epoll_ctl (epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
    {
      DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
      return -1;
    }
  DBG ("fd %d added to epoll", fd);
  return 0;
}

int
mod_epoll_fd (int fd, uint32_t events)
{
  if (fd < 0)
    {
      DBG ("invalid fd %d", fd);
      return -1;
    }
  struct epoll_event evt;
  memset (&evt, 0, sizeof (evt));
  evt.events = events;
  evt.data.fd = fd;
  if (epoll_ctl (epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
    {
      DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
      return -1;
    }
  DBG ("fd %d modified on epoll", fd);
  return 0;
}

int
del_epoll_fd (int fd)
{
  if (fd < 0)
    {
      DBG ("invalid fd %d", fd);
      return -1;
    }
  struct epoll_event evt;
  memset (&evt, 0, sizeof (evt));
  if (epoll_ctl (epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
    {
      DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
      return -1;
    }
  DBG ("fd %d removed from epoll", fd);
  return 0;
}

int
on_connect (memif_conn_handle_t conn, void *private_ctx)
{
  INFO ("memif connected!");
  memif_refill_queue (conn, 0, -1, 0);
  return 0;
}

int
on_disconnect (memif_conn_handle_t conn, void *private_ctx)
{
  INFO ("memif disconnected!");
  return 0;
}

int
control_fd_update (int fd, uint8_t events, void *ctx)
{
  /* convert memif event definitions to epoll events */
  if (events & MEMIF_FD_EVENT_DEL)
    return del_epoll_fd (fd);

  uint32_t evt = 0;
  if (events & MEMIF_FD_EVENT_READ)
    evt |= EPOLLIN;
  if (events & MEMIF_FD_EVENT_WRITE)
    evt |= EPOLLOUT;

  if (events & MEMIF_FD_EVENT_MOD)
    return mod_epoll_fd (fd, evt);

  return add_epoll_fd (fd, evt);
}

int
icmpr_memif_delete (long index)
{
  if (index >= MAX_CONNS)
    {
      INFO ("connection array overflow");
      return 0;
    }
  if (index < 0)
    {
      INFO ("don't even try...");
      return 0;
    }
  memif_connection_t *c = &memif_connection[index];

  if (c->rx_bufs)
    free (c->rx_bufs);
  c->rx_bufs = NULL;
  c->rx_buf_num = 0;
  if (c->tx_bufs)
    free (c->tx_bufs);
  c->tx_bufs = NULL;
  c->tx_buf_num = 0;

  int err;
  /* disconnect then delete memif connection */
  err = memif_delete (&c->conn);
  if (err != MEMIF_ERR_SUCCESS)
    INFO ("memif_delete: %s", memif_strerror (err));
  if (c->conn != NULL)
    INFO ("memif delete fail");
  return 0;
}

int
icmpr_free ()
{
  /* application cleanup */
  int err;
  long i;
  for (i = 0; i < MAX_CONNS; i++)
    {
      memif_connection_t *c = &memif_connection[i];
      if (c->conn)
	icmpr_memif_delete (i);
    }

  err = memif_cleanup ();
  if (err != MEMIF_ERR_SUCCESS)
    INFO ("memif_delete: %s", memif_strerror (err));

  return 0;
}

int
icmpr_add_external_region (void * *addr, uint32_t size, int *fd,
			   void *private_ctx)
{

  int rfd;
  void *raddr;
  int err;

  rfd = memfd_create ("memif region 1", MFD_ALLOW_SEALING);

  fcntl (rfd, F_ADD_SEALS, F_SEAL_SHRINK);

  err = ftruncate (rfd, size);

  if (err)
    return err;

  raddr = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, rfd, 0);

  *addr = raddr;
  *fd = rfd;

  return 0;
}

void *
icmpr_get_external_region_addr (uint32_t size, int fd, void *private_ctx)
{
  return mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
}

int
icmpr_del_external_region (void *addr, uint32_t size, int fd,
			   void *private_ctx)
{
  munmap (addr, size);
  if (fd > 0)
    close (fd);
  fd = -1;
  return 0;
}

int
on_interrupt (memif_conn_handle_t conn, void *private_ctx, uint16_t qid)
{
  long index = *((long *) private_ctx);
  memif_connection_t *c = &memif_connection[index];
  if (c->index != index)
    {
      INFO ("invalid context: %ld/%u", index, c->index);
      return 0;
    }

  int err = MEMIF_ERR_SUCCESS, ret_val;
  uint16_t rx = 0, tx = 0;
  int i = 0;
  int j = 0;

  do
    {
      err = memif_rx_burst (c->conn, qid, c->rx_bufs, MAX_MEMIF_BUFS, &rx);
      ret_val = err;
      c->rx_counter += rx;
      if ((err != MEMIF_ERR_SUCCESS) && (err != MEMIF_ERR_NOBUF))
	{
	  INFO ("memif_rx_burst: %s", memif_strerror (err));
	  goto error;
	}
      i = 0;
      memset (c->tx_bufs, 0, sizeof (memif_buffer_t) * rx);
      err = memif_buffer_alloc (c->conn, qid, c->tx_bufs, rx, &tx, 128);
      if ((err != MEMIF_ERR_SUCCESS) && (err != MEMIF_ERR_NOBUF_RING))
	{
	  INFO ("memif_buffer_alloc: %s", memif_strerror (err));
	  goto error;
	}
      j = 0;
      c->tx_err_counter += rx - tx;

      while (tx)
	{
	  resolve_packet ((void *) (c->rx_bufs + i)->data,
			  (c->rx_bufs + i)->len,
			  (void *) (c->tx_bufs + j)->data,
			  &(c->tx_bufs + j)->len, c->ip_addr);
	  i++;
	  j++;
	  tx--;
	}

      err = memif_refill_queue (c->conn, qid, rx, 0);
      if (err != MEMIF_ERR_SUCCESS)
	INFO ("memif_buffer_free: %s", memif_strerror (err));
      rx -= rx;

      DBG ("%u/%u alloc/free buffers", rx, MAX_MEMIF_BUFS - rx);

      err = memif_tx_burst (c->conn, qid, c->tx_bufs, j, &tx);
      if (err != MEMIF_ERR_SUCCESS)
	{
	  INFO ("memif_tx_burst: %s", memif_strerror (err));
	  goto error;
	}
      c->tx_counter += tx;
    }
  while (ret_val == MEMIF_ERR_NOBUF);

  return 0;

error:
  err = memif_refill_queue (c->conn, qid, rx, 0);
  if (err != MEMIF_ERR_SUCCESS)
    INFO ("memif_buffer_free: %s", memif_strerror (err));
  c->rx_buf_num -= rx;
  DBG ("freed %d buffers. %u/%u alloc/free buffers", rx, c->rx_buf_num,
       MAX_MEMIF_BUFS - c->rx_buf_num);
  return 0;
}

int
on_interrupt1 (memif_conn_handle_t conn, void *private_ctx, uint16_t qid)
{
  long index = *((long *) private_ctx);
  memif_connection_t *c = &memif_connection[index];
  if (c->index != index)
    {
      INFO ("invalid context: %ld/%u", index, c->index);
      return 0;
    }

  int err = MEMIF_ERR_SUCCESS, ret_val;
  int i;
  uint16_t rx, tx;

  do
    {
      /* receive data from shared memory buffers */
      err = memif_rx_burst (c->conn, qid, c->rx_bufs, MAX_MEMIF_BUFS, &rx);
      ret_val = err;
      if ((err != MEMIF_ERR_SUCCESS) && (err != MEMIF_ERR_NOBUF))
	{
	  INFO ("memif_rx_burst: %s", memif_strerror (err));
	  goto error;
	}
      c->rx_buf_num += rx;
      c->rx_counter += rx;

      for (i = 0; i < rx; i++)
	{
	  if (((struct ether_header *) (c->rx_bufs + i)->data)->ether_type ==
	      0x0608)
	    {
	      err =
		memif_buffer_alloc (c->conn, qid, c->tx_bufs, 1, &tx, 128);
	      if ((err != MEMIF_ERR_SUCCESS) && (err != MEMIF_ERR_NOBUF_RING))
		{
		  INFO ("memif_buffer_alloc: %s", memif_strerror (err));
		  goto error;
		}
	      resolve_packet ((void *) (c->rx_bufs + i)->data,
			      (c->rx_bufs + i)->len,
			      (void *) (c->tx_bufs + i)->data,
			      &(c->tx_bufs + i)->len, c->ip_addr);
	      err =
		memif_tx_burst (c->conn, qid, c->tx_bufs, c->tx_buf_num, &tx);
	      if (err != MEMIF_ERR_SUCCESS)
		INFO ("memif_tx_burst: %s", memif_strerror (err));
	      c->tx_buf_num -= tx;
	      c->tx_counter += tx;
	    }
	}

      err = memif_refill_queue (c->conn, qid, rx, 0);
      if (err != MEMIF_ERR_SUCCESS)
	INFO ("memif_buffer_free: %s", memif_strerror (err));
      c->rx_buf_num -= rx;


    }
  while (ret_val == MEMIF_ERR_NOBUF);

  return 0;

error:
  err = memif_refill_queue (c->conn, qid, rx, 0);
  if (err != MEMIF_ERR_SUCCESS)
    INFO ("memif_buffer_free: %s", memif_strerror (err));
  c->rx_buf_num -= rx;
  DBG ("freed %d buffers. %u/%u alloc/free buffers",
       rx, c->rx_buf_num, MAX_MEMIF_BUFS - c->rx_buf_num);
  return 0;
}

int
icmpr_memif_create (long index, long mode, char *s)
{
  if (index >= MAX_CONNS)
    {
      INFO ("connection array overflow");
      return 0;
    }
  if (index < 0)
    {
      INFO ("...");
      return 0;
    }
  memif_connection_t *c = &memif_connection[index];

  memif_conn_args_t args;
  memset (&args, 0, sizeof (args));
  args.is_master = mode;
  args.log2_ring_size = 11;
  args.buffer_size = 2048;
  args.num_s2m_rings = 1;
  args.num_m2s_rings = 1;
  strncpy ((char *) args.interface_name, IF_NAME, strlen (IF_NAME));
  args.mode = 0;
  args.interface_id = index;

  int err;
  if (s == NULL)
    {
      err = memif_create (&c->conn,
			  &args, on_connect, on_disconnect, on_interrupt,
			  &ctx[index]);
      if (err != MEMIF_ERR_SUCCESS)
	{
	  INFO ("memif_create: %s", memif_strerror (err));
	  return 0;
	}
    }
  else
    {
      if (strncmp (s, "1", 1) == 0)
	{
	  err = memif_create (&c->conn,
			      &args, on_connect, on_disconnect, on_interrupt1,
			      &ctx[index]);
	  if (err != MEMIF_ERR_SUCCESS)
	    {
	      INFO ("memif_create: %s", memif_strerror (err));
	      return 0;
	    }
	}
      else
	{
	  INFO ("Unknown interrupt descriptor");
	  goto done;
	}
    }

  c->index = index;
  c->rx_buf_num = 0;
  c->rx_bufs =
    (memif_buffer_t *) malloc (sizeof (memif_buffer_t) * MAX_MEMIF_BUFS);
  c->tx_buf_num = 0;
  c->tx_bufs =
    (memif_buffer_t *) malloc (sizeof (memif_buffer_t) * MAX_MEMIF_BUFS);

  c->ip_addr[0] = 192;
  c->ip_addr[1] = 168;
  c->ip_addr[2] = c->index + 1;
  c->ip_addr[3] = 2;

done:
  return 0;
}

void *
icmpr_send_proc (void *data)
{
  icmpr_thread_data_t *d = (icmpr_thread_data_t *) data;
  int index = d->index;
  uint64_t count = d->packet_num;
  memif_connection_t *c = &memif_connection[index];
  if (c->conn == NULL)
    {
      INFO ("No connection at index %d.", index);
      goto error;
    }
  uint16_t tx, i;
  int err = MEMIF_ERR_SUCCESS;
  uint32_t seq = 0;
  struct timespec start, end;
  memset (&start, 0, sizeof (start));
  memset (&end, 0, sizeof (end));

  timespec_get (&start, TIME_UTC);
  while (count)
    {
      i = 0;
      err =
	memif_buffer_alloc (c->conn, 0, c->tx_bufs,
			    MAX_MEMIF_BUFS > count ? count : MAX_MEMIF_BUFS,
			    &tx, 128);

      if ((err != MEMIF_ERR_SUCCESS) && (err != MEMIF_ERR_NOBUF_RING))
	{
	  INFO ("memif_buffer_alloc: %s", memif_strerror (err));
	  goto error;
	}
      c->tx_buf_num += tx;

      while (tx)
	{
	  while (tx > 4)
	    {
	      generate_packet ((void *) c->tx_bufs[i].data,
			       &c->tx_bufs[i].len, c->ip_addr, d->ip_daddr,
			       d->hw_daddr, seq++);
	      generate_packet ((void *) c->tx_bufs[i + 1].data,
			       &c->tx_bufs[i + 1].len, c->ip_addr,
			       d->ip_daddr, d->hw_daddr, seq++);
	      generate_packet ((void *) c->tx_bufs[i + 2].data,
			       &c->tx_bufs[i + 2].len, c->ip_addr,
			       d->ip_daddr, d->hw_daddr, seq++);
	      generate_packet ((void *) c->tx_bufs[i + 3].data,
			       &c->tx_bufs[i + 3].len, c->ip_addr,
			       d->ip_daddr, d->hw_daddr, seq++);
	      i += 4;
	      tx -= 4;
	    }
	  generate_packet ((void *) c->tx_bufs[i].data, &c->tx_bufs[i].len,
			   c->ip_addr, d->ip_daddr, d->hw_daddr, seq++);
	  i++;
	  tx--;
	}

      err = memif_tx_burst (c->conn, 0, c->tx_bufs, c->tx_buf_num, &tx);
      if (err != MEMIF_ERR_SUCCESS)
	{
	  INFO ("memif_tx_burst: %s", memif_strerror (err));
	  goto error;
	}
      c->tx_buf_num -= tx;
      c->tx_counter += tx;
      count -= tx;
    }

  timespec_get (&end, TIME_UTC);
  INFO ("\n\nPacket sequence finished!\nSeq len: %u", seq);
  uint64_t t1 = end.tv_sec - start.tv_sec;
  uint64_t t2;
  if (end.tv_nsec > start.tv_nsec)
    {
      t2 = end.tv_nsec - start.tv_nsec;
    }
  else
    {
      t2 = start.tv_nsec - end.tv_nsec;
      t1--;
    }
  c->t_sec = t1;
  c->t_nsec = t2;
  double tmp = t1;
  tmp += t2 / 1e+9;
  tmp = seq / tmp;
  INFO ("Seq time: %lus %luns\nAverage pps: %f", t1, t2, tmp);

error:
  INFO ("Thread exiting...");
  pthread_exit (NULL);
}


int
icmpr_send (long index, long packet_num, char *hw, char *ip)
{
  if (index >= MAX_CONNS)
    {
      INFO ("connection array overflow");
      return 0;
    }
  if (index < 0)
    {
      INFO ("...");
      return 0;
    }
  memif_connection_t *c = &memif_connection[index];
  if (c->conn == NULL)
    return -1;
  char *end, *ui;
  uint8_t tmp[6];
  icmpr_thread_data_t *data = &icmpr_thread_data[index];
  data->index = index;
  data->packet_num = packet_num;

  ui = strtok (ip, ".");
  if (ui == NULL)
    goto error;
  tmp[0] = strtol (ui, &end, 10);
  ui = strtok (NULL, ".");
  if (ui == NULL)
    goto error;
  tmp[1] = strtol (ui, &end, 10);
  ui = strtok (NULL, ".");
  if (ui == NULL)
    goto error;
  tmp[2] = strtol (ui, &end, 10);
  ui = strtok (NULL, ".");
  if (ui == NULL)
    goto error;
  tmp[3] = strtol (ui, &end, 10);

  data->ip_daddr[0] = tmp[0];
  data->ip_daddr[1] = tmp[1];
  data->ip_daddr[2] = tmp[2];
  data->ip_daddr[3] = tmp[3];

  ui = strtok (hw, ":");
  if (ui == NULL)
    goto error;
  tmp[0] = strtol (ui, &end, 16);
  ui = strtok (NULL, ":");
  if (ui == NULL)
    goto error;
  tmp[1] = strtol (ui, &end, 16);
  ui = strtok (NULL, ":");
  if (ui == NULL)
    goto error;
  tmp[2] = strtol (ui, &end, 16);
  ui = strtok (NULL, ":");
  if (ui == NULL)
    goto error;
  tmp[3] = strtol (ui, &end, 16);
  ui = strtok (NULL, ":");
  if (ui == NULL)
    goto error;
  tmp[4] = strtol (ui, &end, 16);
  ui = strtok (NULL, ":");
  if (ui == NULL)
    goto error;
  tmp[5] = strtol (ui, &end, 16);

  pthread_create (&thread[index], NULL, icmpr_send_proc, (void *) data);
  return 0;

error:
  INFO ("Invalid input\n");
  return 0;
}

int
user_input_handler ()
{
  char *in = (char *) malloc (256);
  char *ui = fgets (in, 256, stdin);
  char *end;
  long a;

  if (in[0] == '\n')
    goto done;

  ui = strtok (in, " ");

  if (strncmp (ui, "exit", 4) == 0)
    {
      free (in);
      icmpr_free ();
      exit (EXIT_SUCCESS);
    }
  else if (strncmp (ui, "help", 4) == 0)
    {
      print_help ();
      goto done;
    }
  else if (strncmp (ui, "conn", 4) == 0)
    {
      ui = strtok (NULL, " ");
      if (ui != NULL)
	a = strtol (ui, &end, 10);
      else
	{
	  INFO ("expected id");
	  goto done;
	}
      ui = strtok (NULL, " ");
      if (ui != NULL)
	icmpr_memif_create (a, strtol (ui, &end, 10), strtok (NULL, " "));
      else
	INFO ("expected mode <0|1>");
      goto done;
    }
  else if (strncmp (ui, "del", 3) == 0)
    {
      ui = strtok (NULL, " ");
      if (ui != NULL)
	icmpr_memif_delete (strtol (ui, &end, 10));
      else
	{
	  INFO ("expected id");
	  goto done;
	}
    }
  else if (strncmp (ui, "send", 4) == 0)
    {
      ui = strtok (NULL, " ");
      if (ui != NULL)
	a = strtol (ui, &end, 10);
      else
	{
	  INFO ("expected id");
	  goto done;
	}
      ui = strtok (NULL, " ");
      if (ui != NULL)
	icmpr_send (a, strtol (ui, &end, 10), strtok (NULL, " "),
		    strtok (NULL, " "));
      else
	INFO ("expected count");
      goto done;
    }
  else if (strncmp (ui, "show", 4) == 0)
    {
      print_memif_details ();
      goto done;
    }

done:
  free (in);
  return 0;
}

int
poll_event (int timeout)
{
  struct epoll_event evt;
  int app_err = 0, memif_err = 0, en = 0;
  uint32_t events = 0;
  memset (&evt, 0, sizeof (evt));
  evt.events = EPOLLIN | EPOLLOUT;
  sigset_t sigset;
  sigemptyset (&sigset);
  en = epoll_pwait (epfd, &evt, 1, timeout, &sigset);
  /* id event polled */
  if (en < 0)
    {
      DBG ("epoll_pwait: %s", strerror (errno));
      return -1;
    }
  if (en > 0)
    {
      /* this app does not use any other file descriptors than stds and memif control fds */
      if (evt.data.fd > 2)
	{
	  /* event of memif control fd */
	  /* convert epoll events to memif events */
	  if (evt.events & EPOLLIN)
	    events |= MEMIF_FD_EVENT_READ;
	  if (evt.events & EPOLLOUT)
	    events |= MEMIF_FD_EVENT_WRITE;
	  if (evt.events & EPOLLERR)
	    events |= MEMIF_FD_EVENT_ERROR;
	  memif_err = memif_control_fd_handler (evt.data.fd, events);
	  if (memif_err != MEMIF_ERR_SUCCESS)
	    INFO ("memif_control_fd_handler: %s", memif_strerror (memif_err));
	}
      else if (evt.data.fd == 0)
	{
	  app_err = user_input_handler ();
	}
      else
	{
	  DBG ("unexpected event at memif_epfd. fd %d", evt.data.fd);
	}
    }

  if ((app_err < 0) || (memif_err < 0))
    {
      if (app_err < 0)
	DBG ("user input handler error");
      if (memif_err < 0)
	DBG ("memif control fd handler error");
      return -1;
    }

  return 0;
}

int
main ()
{
  epfd = epoll_create (1);
  add_epoll_fd (0, EPOLLIN);

  /* initialize memory interface */
  int err, i;
  /* if valid callback is passed as argument, fd event polling will be done by user
     all file descriptors and events will be passed to user in this callback */
  /* if callback is set to NULL libmemif will handle fd event polling */
  err = memif_init (control_fd_update, APP_NAME, NULL, NULL, NULL);
  if (err != MEMIF_ERR_SUCCESS)
    {
      INFO ("memif_init: %s", memif_strerror (err));
      icmpr_free ();
      exit (-1);
    }

  for (i = 0; i < MAX_CONNS; i++)
    {
      memset (&memif_connection[i], 0, sizeof (memif_connection_t));
      ctx[i] = i;
    }

  memif_register_external_region (icmpr_add_external_region,
				  icmpr_get_external_region_addr,
				  icmpr_del_external_region, NULL);

  print_help ();

  /* main loop */
  while (1)
    {
      if (poll_event (-1) < 0)
	{
	  DBG ("poll_event error!");
	}
    }
}