path: root/src/vnet/bfd/bfd_main.h

/*
 * Copyright (c) 2011-2016 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.
 */
/**
 * @file
 * @brief BFD global declarations
 */
#ifndef __included_bfd_main_h__
#define __included_bfd_main_h__

#include <vnet/vnet.h>
#include <vnet/bfd/bfd_protocol.h>
#include <vnet/bfd/bfd_udp.h>
#include <vlib/log.h>
#include <vppinfra/os.h>
#include <vppinfra/tw_timer_1t_3w_1024sl_ov.h>

#define foreach_bfd_mode(F) \
  F (asynchronous)          \
  F (demand)

typedef enum
{
#define F(x) BFD_MODE_##x,
  foreach_bfd_mode (F)
#undef F
} bfd_mode_e;

typedef struct
{
  /** global configuration key ID */
  u32 conf_key_id;

  /** keeps track of how many sessions reference this key */
  u32 use_count;

  /**
   * key data directly usable for bfd purposes - already padded with zeroes
   * (so we don't need the actual length)
   */
  u8 key[20];

  /** authentication type for this key */
  bfd_auth_type_e auth_type;
} bfd_auth_key_t;

#define foreach_bfd_poll_state(F) \
  F (NOT_NEEDED)                  \
  F (NEEDED)                      \
  F (IN_PROGRESS)                 \
  F (IN_PROGRESS_AND_QUEUED)

typedef enum
{
#define F(x) BFD_POLL_##x,
  foreach_bfd_poll_state (F)
#undef F
} bfd_poll_state_e;

/**
 * hop types
 */
#define foreach_bfd_hop(F)                     \
  F (SINGLE, "single")                         \
  F (MULTI,  "multi")                          \

typedef enum
{
#define F(sym, str) BFD_HOP_TYPE_##sym,
  foreach_bfd_hop (F)
#undef F
} bfd_hop_type_e;

typedef struct bfd_session_s
{
  /** index in bfd_main.sessions pool */
  u32 bs_idx;

  /** session state */
  bfd_state_e local_state;

  /** remote session state */
  bfd_state_e remote_state;

  /** BFD hop type */
  bfd_hop_type_e hop_type;

  /** local diagnostics */
  bfd_diag_code_e local_diag;

  /** remote diagnostics */
  bfd_diag_code_e remote_diag;

  /** local discriminator */
  u32 local_discr;

  /** remote discriminator */
  u32 remote_discr;

  /** configured desired min tx interval (microseconds) */
  u32 config_desired_min_tx_usec;

  /** configured desired min tx interval (nsec) */
  u64 config_desired_min_tx_nsec;

  /** effective desired min tx interval (nsec) */
  u64 effective_desired_min_tx_nsec;

  /** configured required min rx interval (microseconds) */
  u32 config_required_min_rx_usec;

  /** configured required min rx interval (nsec) */
  u64 config_required_min_rx_nsec;

  /** effective required min rx interval (nsec) */
  u64 effective_required_min_rx_nsec;

  /** remote min rx interval (microseconds) */
  u64 remote_min_rx_usec;

  /** remote min rx interval (nsec) */
  u64 remote_min_rx_nsec;

  /** remote min echo rx interval (microseconds) */
  u64 remote_min_echo_rx_usec;

  /** remote min echo rx interval (nsec) */
  u64 remote_min_echo_rx_nsec;

  /** remote desired min tx interval (nsec) */
  u64 remote_desired_min_tx_nsec;

  /** configured detect multiplier */
  u8 local_detect_mult;

  /** 1 if remote system sets demand mode, 0 otherwise */
  u8 remote_demand;

  /** remote detect multiplier */
  u8 remote_detect_mult;

  /** 1 is echo function is active, 0 otherwise */
  u8 echo;

  /** next event time in nsec for this session (0 if no event) */
  u64 event_time_nsec;

  /** timing wheel internal id used to manipulate timer (if set) */
  u32 tw_id;

  /** transmit interval */
  u64 transmit_interval_nsec;

  /** next time at which to transmit a packet */
  u64 tx_timeout_nsec;

  /** timestamp of last packet transmitted */
  u64 last_tx_nsec;

  /** timestamp of last packet received */
  u64 last_rx_nsec;

  /** transmit interval for echo packets */
  u64 echo_transmit_interval_nsec;

  /** next time at which to transmit echo packet */
  u64 echo_tx_timeout_nsec;

  /** timestamp of last echo packet transmitted */
  u64 echo_last_tx_nsec;

  /** timestamp of last echo packet received */
  u64 echo_last_rx_nsec;

  /** secret used for calculating/checking checksum of echo packets */
  u32 echo_secret;

  /** detection time */
  u64 detection_time_nsec;

  /** state info regarding poll sequence */
  bfd_poll_state_e poll_state;

  /**
   * helper for delayed poll sequence - marks either start of running poll
   * sequence or timeout, after which we can start the next poll sequnce
   */
  u64 poll_state_start_or_timeout_nsec;

  /** authentication information */
  struct
  {
    /** current key in use */
    bfd_auth_key_t *curr_key;

    /**
     * set to next key to use if delayed switch is enabled - in that case
     * the key is switched when first incoming packet is signed with next_key
     */
    bfd_auth_key_t *next_key;

    /** sequence number incremented occasionally or always (if meticulous) */
    u32 local_seq_number;

    /** remote sequence number */
    u32 remote_seq_number;

    /** set to 1 if remote sequence number is known */
    u8 remote_seq_number_known;

    /** current key ID sent out in bfd packet */
    u8 curr_bfd_key_id;

    /** key ID to use when switched to next_key */
    u8 next_bfd_key_id;

    /**
     * set to 1 if delayed action is pending, which might be activation
     * of authentication, change of key or deactivation
     */
    u8 is_delayed;
  } auth;

  /** transport type for this session */
  bfd_transport_e transport;

  /** union of transport-specific data */
  union
  {
    bfd_udp_session_t udp;
  };
} bfd_session_t;

/**
 * listener events
 */
#define foreach_bfd_listen_event(F)            \
  F (CREATE, "sesion-created")                 \
  F (UPDATE, "session-updated")                \
  F (DELETE, "session-deleted")

typedef enum
{
#define F(sym, str) BFD_LISTEN_EVENT_##sym,
  foreach_bfd_listen_event (F)
#undef F
} bfd_listen_event_e;

/**
 * session nitification call back function type
 */
typedef void (*bfd_notify_fn_t) (bfd_listen_event_e, const bfd_session_t *);

typedef struct
{
  /** lock to protect data structures */
  clib_spinlock_t lock;
  int lock_recursion_count;
  uword owner_thread_index;

  /** Number of event wakeup RPCs in flight. Should be 0 or 1 */
  int bfd_process_wakeup_events_in_flight;

  /** The timestamp of last wakeup event being sent */
  u64 bfd_process_wakeup_event_start_nsec;

  /** The time it took the last wakeup event to make it to handling */
  u64 bfd_process_wakeup_event_delay_nsec;

  /** When the bfd process is supposed to wake up next */
  u64 bfd_process_next_wakeup_nsec;

  /** pool of bfd sessions context data */
  bfd_session_t *sessions;

  /** timing wheel for scheduling timeouts */
    TWT (tw_timer_wheel) wheel;

  /** hashmap - bfd session by discriminator */
  u32 *session_by_disc;

  /** background process node index */
  u32 bfd_process_node_index;

  /** convenience variables */
  vlib_main_t *vlib_main;
  vnet_main_t *vnet_main;

  /** how many nanoseconds is one timing wheel tick */
  u64 nsec_per_tw_tick;

  /** default desired min tx in nsec */
  u64 default_desired_min_tx_nsec;

  /** minimum required min rx while echo function is active - nsec */
  u64 min_required_min_rx_while_echo_nsec;

  /** for generating random numbers */
  u32 random_seed;

  /** pool of authentication keys */
  bfd_auth_key_t *auth_keys;

  /** hashmap - index in pool auth_keys by conf_key_id */
  u32 *auth_key_by_conf_key_id;

  /** vector of callback notification functions */
  bfd_notify_fn_t *listeners;

  /** log class */
  vlib_log_class_t log_class;
} bfd_main_t;

extern bfd_main_t bfd_main;

/** Packet counters */
#define foreach_bfd_error(F)               \
  F (NONE, "good bfd packets (processed)") \
  F (BAD, "invalid bfd packets")           \
  F (DISABLED, "bfd packets received on disabled interfaces")

typedef enum
{
#define F(sym, str) BFD_ERROR_##sym,
  foreach_bfd_error (F)
#undef F
    BFD_N_ERROR,
} bfd_error_t;

/** bfd packet trace capture */
typedef struct
{
  u32 len;
  u8 data[400];
} bfd_input_trace_t;

typedef enum
{
  BFD_EVENT_RESCHEDULE = 1,
  BFD_EVENT_NEW_SESSION,
  BFD_EVENT_CONFIG_CHANGED,
} bfd_process_event_e;

/* *INDENT-OFF* */
/** echo packet structure */
typedef CLIB_PACKED (struct {
  /** local discriminator */
  u32 discriminator;
  /** expire time of this packet - nsec */
  u64 expire_time_nsec;
  /** checksum - based on discriminator, local secret and expire time */
  u64 checksum;
}) bfd_echo_pkt_t;
/* *INDENT-ON* */

static inlin
}
/*
 * 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 <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <time.h>
#include <arpa/inet.h>
#include <vcl/vcl_test.h>
#include <pthread.h>

typedef struct
{
  vcl_test_session_t *sessions;
  uint32_t n_sessions;
  uint32_t wrk_index;
  fd_set wr_fdset;
  fd_set rd_fdset;
  int max_fd_index;
  pthread_t thread_handle;
  vcl_test_cfg_t cfg;
} vcl_test_client_worker_t;

typedef struct
{
  vcl_test_client_worker_t *workers;
  vppcom_endpt_t server_endpt;
  uint32_t cfg_seq_num;
  vcl_test_session_t ctrl_session;
  vcl_test_session_t *sessions;
  uint8_t dump_cfg;
  vcl_test_t post_test;
  uint32_t proto;
  uint32_t n_workers;
  volatile int active_workers;
  struct sockaddr_storage server_addr;
} vcl_test_client_main_t;

static __thread int __wrk_index = 0;

vcl_test_client_main_t vcl_client_main;

#define vtc_min(a, b) (a < b ? a : b)
#define vtc_max(a, b) (a > b ? a : b)

static int
vtc_cfg_sync (vcl_test_session_t * ts)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_cfg_t *rx_cfg = (vcl_test_cfg_t *) ts->rxbuf;
  int rx_bytes, tx_bytes;

  vt_atomic_add (&ts->cfg.seq_num, 1);
  if (ts->cfg.verbose)
    {
      vtinf ("(fd %d): Sending config to server.", ts->fd);
      vcl_test_cfg_dump (&ts->cfg, 1 /* is_client */ );
    }
  tx_bytes = vcl_test_write (ts->fd, (uint8_t *) & ts->cfg,
			     sizeof (ts->cfg), NULL, ts->cfg.verbose);
  if (tx_bytes < 0)
    {
      vtwrn ("(fd %d): write test cfg failed (%d)!", ts->fd, tx_bytes);
      return tx_bytes;
    }

  rx_bytes = vcl_test_read (ts->fd, (uint8_t *) ts->rxbuf,
			    sizeof (vcl_test_cfg_t), NULL);
  if (rx_bytes < 0)
    return rx_bytes;

  if (rx_cfg->magic != VCL_TEST_CFG_CTRL_MAGIC)
    {
      vtwrn ("(fd %d): Bad server reply cfg -- aborting!", ts->fd);
      return -1;
    }
  if ((rx_bytes != sizeof (vcl_test_cfg_t))
      || !vcl_test_cfg_verify (rx_cfg, &ts->cfg))
    {
      vtwrn ("(fd %d): Invalid config received from server!", ts->fd);
      if (rx_bytes != sizeof (vcl_test_cfg_t))
	{
	  vtinf ("\tRx bytes %d != cfg size %lu", rx_bytes,
		 sizeof (vcl_test_cfg_t));
	}
      else
	{
	  vcl_test_cfg_dump (rx_cfg, 1 /* is_client */ );
	  vtinf ("(fd %d): Valid config sent to server.", ts->fd);
	  vcl_test_cfg_dump (&ts->cfg, 1 /* is_client */ );
	}
      return -1;
    }
  if (ts->cfg.verbose)
    {
      vtinf ("(fd %d): Got config back from server.", ts->fd);
      vcl_test_cfg_dump (rx_cfg, 1 /* is_client */ );
    }

  return 0;
}

static int
vtc_connect_test_sessions (vcl_test_client_worker_t * wrk)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ts;
  uint32_t n_test_sessions;
  int i