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/*
* BIRD -- Bidirectional Forwarding Detection (BFD)
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_BFD_H_
#define _BIRD_BFD_H_
#include <pthread.h>
#include "nest/bird.h"
#include "nest/cli.h"
#include "nest/iface.h"
#include "nest/protocol.h"
#include "nest/route.h"
#include "conf/conf.h"
#include "lib/hash.h"
#include "lib/resource.h"
#include "lib/socket.h"
#include "lib/string.h"
#include "io.h"
#define BFD_CONTROL_PORT 3784
#define BFD_ECHO_PORT 3785
#define BFD_MULTI_CTL_PORT 4784
#define BFD_DEFAULT_MIN_RX_INT (10 _MS)
#define BFD_DEFAULT_MIN_TX_INT (100 _MS)
#define BFD_DEFAULT_IDLE_TX_INT (1 _S)
#define BFD_DEFAULT_MULTIPLIER 5
struct bfd_config
{
struct proto_config c;
list neigh_list; /* List of struct bfd_neighbor */
};
struct bfd_session_config
{
u32 min_rx_int;
u32 min_tx_int;
u32 idle_tx_int;
u8 multiplier;
u8 multihop;
u8 passive;
};
struct bfd_neighbor
{
node n;
ip_addr addr;
ip_addr local;
struct iface *iface;
struct bfd_session_config *opts;
struct bfd_session *session;
};
struct bfd_proto
{
struct proto p;
struct birdloop *loop;
pool *tpool;
pthread_spinlock_t lock;
slab *session_slab;
HASH(struct bfd_session) session_hash_id;
HASH(struct bfd_session) session_hash_ip;
sock *notify_rs;
sock *notify_ws;
list notify_list;
sock *rx_1;
sock *rx_m;
list sock_list;
};
struct bfd_socket
{
node n;
sock *sk;
u32 uc;
};
struct bfd_session
{
node n;
ip_addr addr; /* Address of session */
struct bfd_session *next_id; /* Next in bfd.session_hash_id */
struct bfd_session *next_ip; /* Next in bfd.session_hash_ip */
struct bfd_proto *bfd;
u8 opened;
u8 passive;
u8 poll_active;
u8 poll_scheduled;
u8 loc_state;
u8 rem_state;
u8 loc_diag;
u8 rem_diag;
u32 loc_id; /* Local session ID (local discriminator) */
u32 rem_id; /* Remote session ID (remote discriminator) */
u32 des_min_tx_int; /* Desired min rx interval, local option */
u32 des_min_tx_new; /* Used for des_min_tx_int change */
u32 req_min_rx_int; /* Required min tx interval, local option */
u32 req_min_rx_new; /* Used for req_min_rx_int change */
u32 rem_min_tx_int; /* Last received des_min_tx_int */
u32 rem_min_rx_int; /* Last received req_min_rx_int */
u8 demand_mode; /* Currently unused */
u8 rem_demand_mode;
u8 detect_mult; /* Announced detect_mult, local option */
u8 rem_detect_mult; /* Last received detect_mult */
btime last_tx; /* Time of last sent periodic control packet */
btime last_rx; /* Time of last received valid control packet */
timer2 *tx_timer; /* Periodic control packet timer */
timer2 *hold_timer; /* Timer for session down detection time */
struct bfd_socket *bsock; /* Socket associated with session */
};
extern const char *bfd_state_names[];
#define BFD_STATE_ADMIN_DOWN 0
#define BFD_STATE_DOWN 1
#define BFD_STATE_INIT 2
#define BFD_STATE_UP 3
#define BFD_DIAG_NOTHING 0
#define BFD_DIAG_TIMEOUT 1
#define BFD_DIAG_ECHO_FAILED 2
#define BFD_DIAG_NEIGHBOR_DOWN 3
#define BFD_DIAG_FWD_RESET 4
#define BFD_DIAG_PATH_DOWN 5
#define BFD_DIAG_C_PATH_DOWN 6
#define BFD_DIAG_ADMIN_DOWN 7
#define BFD_DIAG_RC_PATH_DOWN 8
#define BFD_POLL_TX 1
#define BFD_POLL_RX 2
#define BFD_FLAGS 0x3f
#define BFD_FLAG_POLL (1 << 5)
#define BFD_FLAG_FINAL (1 << 4)
#define BFD_FLAG_CPI (1 << 3)
#define BFD_FLAG_AP (1 << 2)
#define BFD_FLAG_DEMAND (1 << 1)
#define BFD_FLAG_MULTIPOINT (1 << 0)
static inline void bfd_lock_sessions(struct bfd_proto *p) { pthread_spin_lock(&p->lock); }
static inline void bfd_unlock_sessions(struct bfd_proto *p) { pthread_spin_unlock(&p->lock); }
/* bfd.c */
struct bfd_session * bfd_find_session_by_id(struct bfd_proto *p, u32 id);
struct bfd_session * bfd_find_session_by_addr(struct bfd_proto *p, ip_addr addr);
void bfd_session_process_ctl(struct bfd_session *s, u8 flags, u32 old_tx_int, u32 old_rx_int);
void bfd_show_sessions(struct proto *P);
/* packets.c */
void bfd_send_ctl(struct bfd_proto *p, struct bfd_session *s, int final);
sock * bfd_open_rx_sk(struct bfd_proto *p, int multihop);
struct bfd_socket * bfd_get_socket(struct bfd_proto *p, ip_addr local, struct iface *ifa);
void bfd_free_socket(struct bfd_socket *sk);
#endif /* _BIRD_BFD_H_ */
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