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/*
* 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 <vppinfra/timing_wheel.h>
#include <vnet/vnet.h>
#include <vnet/bfd/bfd_protocol.h>
#include <vnet/bfd/bfd_udp.h>
#define foreach_bfd_transport(F) \
F (UDP4, "ip4-rewrite") \
F (UDP6, "ip6-rewrite")
typedef enum
{
#define F(t, n) BFD_TRANSPORT_##t,
foreach_bfd_transport (F)
#undef F
} bfd_transport_t;
#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
{
/* index in bfd_main.sessions pool */
u32 bs_idx;
/* session state */
bfd_state_e local_state;
/* local diagnostics */
bfd_diag_code_e local_diag;
/* remote session state */
bfd_state_e remote_state;
/* local discriminator */
u32 local_discr;
/* remote discriminator */
u32 remote_discr;
/* configured desired min tx interval (microseconds) */
u32 config_desired_min_tx_us;
/* desired min tx interval (microseconds) */
u32 desired_min_tx_us;
/* desired min tx interval (clocks) */
u64 desired_min_tx_clocks;
/* required min rx interval (microseconds) */
u32 required_min_rx_us;
/* required min echo rx interval (microseconds) */
u32 required_min_echo_rx_us;
/* remote min rx interval (microseconds) */
u32 remote_min_rx_us;
/* remote min rx interval (clocks) */
u64 remote_min_rx_clocks;
/* remote desired min tx interval (microseconds) */
u32 remote_desired_min_tx_us;
/* 1 if in demand mode, 0 otherwise */
u8 local_demand;
/* 1 if remote system sets demand mode, 0 otherwise */
u8 remote_demand;
/* local detect multiplier */
u8 local_detect_mult;
/* remote detect multiplier */
u8 remote_detect_mult;
/* set to value of timer in timing wheel, 0 if never set */
u64 wheel_time_clocks;
/* transmit interval */
u64 transmit_interval_clocks;
/* next time at which to transmit a packet */
u64 tx_timeout_clocks;
/* timestamp of last packet transmitted */
u64 last_tx_clocks;
/* timestamp of last packet received */
u64 last_rx_clocks;
/* detection time */
u64 detection_time_clocks;
/* transport type for this session */
bfd_transport_t transport;
union
{
bfd_udp_session_t udp;
};
} bfd_session_t;
typedef struct
{
u32 client_index;
u32 client_pid;
} event_subscriber_t;
typedef struct
{
/* pool of bfd sessions context data */
bfd_session_t *sessions;
/* timing wheel for scheduling timeouts */
timing_wheel_t wheel;
/* timing wheel inaccuracy, in clocks */
u64 wheel_inaccuracy;
/* 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;
/* cpu clocks per second */
f64 cpu_cps;
/* for generating random numbers */
u32 random_seed;
} 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;
enum
{
BFD_EVENT_RESCHEDULE = 1,
BFD_EVENT_NEW_SESSION,
} bfd_process_event_e;
u8 *bfd_input_format_trace (u8 * s, va_list * args);
bfd_session_t *bfd_get_session (bfd_main_t * bm, bfd_transport_t t);
void bfd_put_session (bfd_main_t * bm, bfd_session_t * bs);
bfd_session_t *bfd_find_session_by_idx (bfd_main_t * bm, uword bs_idx);
bfd_session_t *bfd_find_session_by_disc (bfd_main_t * bm, u32 disc);
void bfd_session_start (bfd_main_t * bm, bfd_session_t * bs);
void bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * bfd, u32 bs_idx);
int bfd_verify_pkt_common (const bfd_pkt_t * pkt);
int bfd_verify_pkt_session (const bfd_pkt_t * pkt, u16 pkt_size,
const bfd_session_t * bs);
void bfd_event (bfd_main_t * bm, bfd_session_t * bs);
void bfd_send_final (vlib_main_t * vm, vlib_buffer_t * b, bfd_session_t * bs);
u8 *format_bfd_session (u8 * s, va_list * args);
#define USEC_PER_MS 1000LL
#define USEC_PER_SECOND (1000 * USEC_PER_MS)
/* default, slow transmission interval for BFD packets, per spec at least 1s */
#define BFD_DEFAULT_DESIRED_MIN_TX_US USEC_PER_SECOND
#endif /* __included_bfd_main_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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