C++ BGP_DEBUG函数代码示例

/* Inteface addition message from zebra. */
static int
bgp_interface_add (int command, struct zclient *zclient, zebra_size_t length,
    vrf_id_t vrf_id)
{
  struct interface *ifp;

  ifp = zebra_interface_add_read (zclient->ibuf, vrf_id);

  if (BGP_DEBUG(zebra, ZEBRA) && ifp)
    zlog_debug("Zebra rcvd: interface add %s", ifp->name);

  return 0;
}

/* This function is the first starting point of all BGP connection. It
   try to connect to remote peer with non-blocking IO. */
int
bgp_start (struct peer *peer)
{
  int status;

  status = bgp_connect (peer);

  switch (status)
    {
    case connect_error:
      if (BGP_DEBUG (fsm, FSM))
	plog_info (peer->log, "%s [FSM] Connect error", peer->host);
      BGP_EVENT_ADD (peer, TCP_connection_open_failed);
      break;
    case connect_success:
      if (BGP_DEBUG (fsm, FSM))
	plog_info (peer->log, "%s [FSM] Connect immediately success",
		   peer->host);
      BGP_EVENT_ADD (peer, TCP_connection_open);
      break;
    case connect_in_progress:
      /* To check nonblocking connect, we wait until socket is
         readable or writable. */
      if (BGP_DEBUG (fsm, FSM))
	plog_info (peer->log, "%s [FSM] Non blocking connect waiting result",
		   peer->host);
      if (peer->fd < 0)
	{
	  zlog_err ("bgp_start peer's fd is negative value %d",
		    peer->fd);
	  return -1;
	}
      BGP_READ_ON (peer->t_read, bgp_read, peer->fd);
      BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd);
      break;
    }
  return 0;
}

/* BGP try to connect to the peer.  */
int
bgp_connect (struct peer *peer)
{
  ifindex_t ifindex = 0;

  /* Make socket for the peer. */
  peer->fd = sockunion_socket (&peer->su);
  if (peer->fd < 0)
    return -1;

  set_nonblocking (peer->fd);

  /* Set socket send buffer size */
  bgp_update_sock_send_buffer_size(peer->fd);

  bgp_set_socket_ttl (peer, peer->fd);

  sockopt_reuseaddr (peer->fd);
  sockopt_reuseport (peer->fd);
  
#ifdef IPTOS_PREC_INTERNETCONTROL
  if (bgpd_privs.change (ZPRIVS_RAISE))
    zlog_err ("%s: could not raise privs", __func__);
  if (sockunion_family (&peer->su) == AF_INET)
    setsockopt_ipv4_tos (peer->fd, IPTOS_PREC_INTERNETCONTROL);
  else if (sockunion_family (&peer->su) == AF_INET6)
    setsockopt_ipv6_tclass (peer->fd, IPTOS_PREC_INTERNETCONTROL);
  if (bgpd_privs.change (ZPRIVS_LOWER))
    zlog_err ("%s: could not lower privs", __func__);
#endif

  if (peer->password)
    bgp_md5_set_connect (peer->fd, &peer->su, peer->password);

  /* Bind socket. */
  bgp_bind (peer);

  /* Update source bind. */
  bgp_update_source (peer);

  if (peer->ifname)
    ifindex = ifname2ifindex (peer->ifname);

  if (BGP_DEBUG (events, EVENTS))
    plog_debug (peer->log, "%s [Event] Connect start to %s fd %d",
	       peer->host, peer->host, peer->fd);

  /* Connect to the remote peer. */
  return sockunion_connect (peer->fd, &peer->su, htons (peer->port), ifindex);
}

static int
bgp_interface_down (int command, struct zclient *zclient, zebra_size_t length)
{
  struct stream *s;
  struct interface *ifp;
  struct connected *c;
  struct listnode *node, *nnode;

  s = zclient->ibuf;
  ifp = zebra_interface_state_read (s);
  if (! ifp)
    return 0;

  if (BGP_DEBUG(zebra, ZEBRA))
    zlog_debug("Zebra rcvd: interface %s down", ifp->name);

  for (ALL_LIST_ELEMENTS (ifp->connected, node, nnode, c))
    bgp_connected_delete (c);

  /* Fast external-failover (Currently IPv4 only) */
  {
    struct listnode *mnode;
    struct bgp *bgp;
    struct peer *peer;
    struct interface *peer_if;

    for (ALL_LIST_ELEMENTS_RO (bm->bgp, mnode, bgp))
      {
	if (CHECK_FLAG (bgp->flags, BGP_FLAG_NO_FAST_EXT_FAILOVER))
	  continue;

	for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer))
	  {
	    if (peer->ttl != 1)
	      continue;

	    if (peer->su.sa.sa_family == AF_INET)
	      peer_if = if_lookup_by_ipv4 (&peer->su.sin.sin_addr);
	    else
	      continue;

	    if (ifp == peer_if)
	      BGP_EVENT_ADD (peer, BGP_Stop);
	  }
      }
  }

  return 0;
}

/* Called after event occured, this function change status and reset
   read/write and timer thread. */
void
bgp_fsm_change_status (struct peer *peer, int status)
{
  bgp_dump_state (peer, peer->status, status);

  /* Preserve old status and change into new status. */
  peer->ostatus = peer->status;
  peer->status = status;

  if (BGP_DEBUG (normal, NORMAL))
    zlog_debug ("%s went from %s to %s",
		peer->host,
		LOOKUP (bgp_status_msg, peer->ostatus),
		LOOKUP (bgp_status_msg, peer->status));
}

/* Called after event occured, this function change status and reset
   read/write and timer thread. */
void
bgp_fsm_change_status (struct peer *peer, int status)
{
  bgp_dump_state (peer, peer->status, status);

  /* Preserve old status and change into new status. */
  peer->ostatus = peer->status;
  peer->status = status;

  if (BGP_DEBUG (normal, NORMAL))
    if (! CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER))
      zlog_info ("%s went from %s to %s", peer->host,
		 LOOKUP (bgp_status_msg, peer->ostatus),
		 LOOKUP (bgp_status_msg, peer->status));
}

/* dump notify packet */
void
bgp_notify_print(struct peer *peer, struct bgp_notify *bgp_notify, 
                 const char *direct)
{
  const char *subcode_str;

  subcode_str = "";

  switch (bgp_notify->code) 
    {
    case BGP_NOTIFY_HEADER_ERR:
      subcode_str = LOOKUP (bgp_notify_head_msg, bgp_notify->subcode);
      break;
    case BGP_NOTIFY_OPEN_ERR:
      subcode_str = LOOKUP (bgp_notify_open_msg, bgp_notify->subcode);
      break;
    case BGP_NOTIFY_UPDATE_ERR:
      subcode_str = LOOKUP (bgp_notify_update_msg, bgp_notify->subcode);
      break;
    case BGP_NOTIFY_HOLD_ERR:
      subcode_str = "";
      break;
    case BGP_NOTIFY_FSM_ERR:
      subcode_str = "";
      break;
    case BGP_NOTIFY_CEASE:
      subcode_str = LOOKUP (bgp_notify_cease_msg, bgp_notify->subcode);
      break;
    case BGP_NOTIFY_CAPABILITY_ERR:
      subcode_str = LOOKUP (bgp_notify_capability_msg, bgp_notify->subcode);
      break;
    }

  if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES))
    zlog_info ("%%NOTIFICATION: %s neighbor %s %d/%d (%s%s) %d bytes %s",
              strcmp (direct, "received") == 0 ? "received from" : "sent to",
              peer->host, bgp_notify->code, bgp_notify->subcode,
               LOOKUP (bgp_notify_msg, bgp_notify->code),
              subcode_str, bgp_notify->length,
              bgp_notify->data ? bgp_notify->data : "");
  else if (BGP_DEBUG (normal, NORMAL))
    plog_debug (peer->log, "%s %s NOTIFICATION %d/%d (%s%s) %d bytes %s",
	       peer ? peer->host : "",
	       direct, bgp_notify->code, bgp_notify->subcode,
	       LOOKUP (bgp_notify_msg, bgp_notify->code),
	       subcode_str, bgp_notify->length,
	       bgp_notify->data ? bgp_notify->data : "");
}

static int
bgp_interface_delete (int command, struct zclient *zclient,
		      zebra_size_t length)
{
  struct stream *s;
  struct interface *ifp;

  s = zclient->ibuf;
  ifp = zebra_interface_state_read (s);
  ifp->ifindex = IFINDEX_INTERNAL;

  if (BGP_DEBUG(zebra, ZEBRA))
    zlog_debug("Zebra rcvd: interface delete %s", ifp->name);

  return 0;
}

/* BGP scan thread.  This thread check nexthop reachability. */
static int
bgp_scan_timer (struct thread *t)
{
  bgp_scan_thread =
    thread_add_timer (master, bgp_scan_timer, NULL, bgp_scan_interval);

  if (BGP_DEBUG (events, EVENTS))
    zlog_debug ("Performing BGP general scanning");

  bgp_scan (AFI_IP, SAFI_UNICAST);

#ifdef HAVE_IPV6
  bgp_scan (AFI_IP6, SAFI_UNICAST);
#endif /* HAVE_IPV6 */

  return 0;
}

/* BGP connect retry timer. */
static int
bgp_connect_timer (struct thread *thread)
{
  struct peer *peer;

  peer = THREAD_ARG (thread);
  peer->t_connect = NULL;

  if (BGP_DEBUG (fsm, FSM))
    zlog (peer->log, LOG_DEBUG, "%s [FSM] Timer (connect timer expire)",
	  peer->host);

  THREAD_VAL (thread) = ConnectRetry_timer_expired;
  bgp_event (thread); /* bgp_event unlocks peer */

  return 0;
}

/* BGP try to connect to the peer.  */
int
bgp_connect (struct peer *peer)
{
  unsigned int ifindex = 0;

  /* Make socket for the peer. */
  peer->fd = sockunion_socket (&peer->su);
  if (peer->fd < 0)
    return -1;

  /* If we can get socket for the peer, adjest TTL and make connection. */
  if (peer_sort (peer) == BGP_PEER_EBGP) {
    sockopt_ttl (peer->su.sa.sa_family, peer->fd, peer->ttl);
    if (peer->gtsm_hops)
      sockopt_minttl (peer->su.sa.sa_family, peer->fd, MAXTTL + 1 - peer->gtsm_hops);
  }

  sockopt_reuseaddr (peer->fd);
  sockopt_reuseport (peer->fd);
  
#ifdef IPTOS_PREC_INTERNETCONTROL
  if (sockunion_family (&peer->su) == AF_INET)
    setsockopt_ipv4_tos (peer->fd, IPTOS_PREC_INTERNETCONTROL);
#endif

  if (peer->password)
    bgp_md5_set_connect (peer->fd, &peer->su, peer->password);

  /* Bind socket. */
  bgp_bind (peer);

  /* Update source bind. */
  bgp_update_source (peer);

#ifdef HAVE_IPV6
  if (peer->ifname)
    ifindex = if_nametoindex (peer->ifname);
#endif /* HAVE_IPV6 */

  if (BGP_DEBUG (events, EVENTS))
    plog_debug (peer->log, "%s [Event] Connect start to %s fd %d",
	       peer->host, peer->host, peer->fd);

  /* Connect to the remote peer. */
  return sockunion_connect (peer->fd, &peer->su, htons (peer->port), ifindex);
}

/* BGP start timer.  This function set BGP_Start event to thread value
   and process event. */
static int
bgp_start_timer (struct thread *thread)
{
  struct peer *peer;

  peer = THREAD_ARG (thread);
  peer->t_start = NULL;

  if (BGP_DEBUG (fsm, FSM))
    zlog (peer->log, LOG_DEBUG,
	  "%s [FSM] Timer (start timer expire).", peer->host);

  THREAD_VAL (thread) = BGP_Start;
  bgp_event (thread);  /* bgp_event unlocks peer */

  return 0;
}

/* BGP holdtime timer. */
static int
bgp_holdtime_timer (struct thread *thread)
{
  struct peer *peer;

  peer = THREAD_ARG (thread);
  peer->t_holdtime = NULL;

  if (BGP_DEBUG (fsm, FSM))
    zlog (peer->log, LOG_DEBUG,
	  "%s [FSM] Timer (holdtime timer expire)",
	  peer->host);

  THREAD_VAL (thread) = Hold_Timer_expired;
  bgp_event (thread);

  return 0;
}

/* BGP keepalive fire ! */
static int
bgp_keepalive_timer (struct thread *thread)
{
  struct peer *peer;

  peer = THREAD_ARG (thread);
  peer->t_keepalive = NULL;

  if (BGP_DEBUG (fsm, FSM))
    zlog (peer->log, LOG_DEBUG,
	  "%s [FSM] Timer (keepalive timer expire)",
	  peer->host);

  THREAD_VAL (thread) = KeepAlive_timer_expired;
  bgp_event (thread); /* bgp_event unlocks peer */

  return 0;
}

/* BGP start timer.  This function set BGP_Start event to thread value
   and process event. */
static int
bgp_start_timer (struct thread *thread)
{
  struct peer *peer;

  peer = THREAD_ARG (thread);
  peer->t_start = NULL;

  UNSET_FLAG (peer->sflags, PEER_STATUS_CREATE_INIT);

  if (BGP_DEBUG (fsm, FSM))
    zlog (peer->log, LOG_DEBUG,
	  "%s [FSM] Timer (start timer expire).", peer->host);

  THREAD_VAL (thread) = BGP_Start;
  bgp_event (thread);

  return 0;
}