proto/bfd/bfd.h

   1 /*
   2  *      BIRD -- Bidirectional Forwarding Detection (BFD)
   3  *
   4  *      Can be freely distributed and used under the terms of the GNU GPL.
   5  */
   6
   7 #ifndef _BIRD_BFD_H_
   8 #define _BIRD_BFD_H_
   9
  10 #include <pthread.h>
  11
  12 #include "nest/bird.h"
  13 #include "nest/cli.h"
  14 #include "nest/iface.h"
  15 #include "nest/protocol.h"
  16 #include "nest/route.h"
  17 #include "conf/conf.h"
  18 #include "lib/hash.h"
  19 #include "lib/resource.h"
  20 #include "lib/socket.h"
  21 #include "lib/string.h"
  22
  23 #include "nest/bfd.h"
  24 #include "io.h"
  25
  26
  27 #define BFD_CONTROL_PORT        3784
  28 #define BFD_ECHO_PORT           3785
  29 #define BFD_MULTI_CTL_PORT      4784
  30
  31 #define BFD_DEFAULT_MIN_RX_INT  (10 MS_)
  32 #define BFD_DEFAULT_MIN_TX_INT  (100 MS_)
  33 #define BFD_DEFAULT_IDLE_TX_INT (1 S_)
  34 #define BFD_DEFAULT_MULTIPLIER  5
  35
  36
  37 struct bfd_iface_config;
  38
  39 struct bfd_config
  40 {
  41   struct proto_config c;
  42   list patt_list;               /* List of iface configs (struct bfd_iface_config) */
  43   list neigh_list;              /* List of configured neighbors (struct bfd_neighbor) */
  44   struct bfd_iface_config *multihop; /* Multihop pseudoiface config */
  45 };
  46
  47 struct bfd_iface_config
  48 {
  49   struct iface_patt i;
  50   u32 min_rx_int;
  51   u32 min_tx_int;
  52   u32 idle_tx_int;
  53   u8 multiplier;
  54   u8 passive;
  55 };
  56
  57 struct bfd_neighbor
  58 {
  59   node n;
  60   ip_addr addr;
  61   ip_addr local;
  62   struct iface *iface;
  63
  64   struct neighbor *neigh;
  65   struct bfd_request *req;
  66
  67   u8 multihop;
  68   u8 active;
  69 };
  70
  71 struct bfd_proto
  72 {
  73   struct proto p;
  74   struct birdloop *loop;
  75   pool *tpool;
  76   pthread_spinlock_t lock;
  77   node bfd_node;
  78
  79   slab *session_slab;
  80   HASH(struct bfd_session) session_hash_id;
  81   HASH(struct bfd_session) session_hash_ip;
  82
  83   sock *notify_rs;
  84   sock *notify_ws;
  85   list notify_list;
  86
  87   sock *rx4_1;
  88   sock *rx6_1;
  89   sock *rx4_m;
  90   sock *rx6_m;
  91   list iface_list;
  92 };
  93
  94 struct bfd_iface
  95 {
  96   node n;
  97   ip_addr local;
  98   struct iface *iface;
  99   struct bfd_iface_config *cf;
 100   struct bfd_proto *bfd;
 101
 102   sock *sk;
 103   u32 uc;
 104   u8 changed;
 105 };
 106
 107 struct bfd_session
 108 {
 109   node n;
 110   ip_addr addr;                         /* Address of session */
 111   struct bfd_iface *ifa;                /* Iface associated with session */
 112   struct bfd_session *next_id;          /* Next in bfd.session_hash_id */
 113   struct bfd_session *next_ip;          /* Next in bfd.session_hash_ip */
 114
 115   u8 opened_unused;
 116   u8 passive;
 117   u8 poll_active;
 118   u8 poll_scheduled;
 119
 120   u8 loc_state;
 121   u8 rem_state;
 122   u8 loc_diag;
 123   u8 rem_diag;
 124   u32 loc_id;                           /* Local session ID (local discriminator) */
 125   u32 rem_id;                           /* Remote session ID (remote discriminator) */
 126   u32 des_min_tx_int;                   /* Desired min rx interval, local option */
 127   u32 des_min_tx_new;                   /* Used for des_min_tx_int change */
 128   u32 req_min_rx_int;                   /* Required min tx interval, local option */
 129   u32 req_min_rx_new;                   /* Used for req_min_rx_int change */
 130   u32 rem_min_tx_int;                   /* Last received des_min_tx_int */
 131   u32 rem_min_rx_int;                   /* Last received req_min_rx_int */
 132   u8 demand_mode;                       /* Currently unused */
 133   u8 rem_demand_mode;
 134   u8 detect_mult;                       /* Announced detect_mult, local option */
 135   u8 rem_detect_mult;                   /* Last received detect_mult */
 136
 137   btime last_tx;                        /* Time of last sent periodic control packet */
 138   btime last_rx;                        /* Time of last received valid control packet */
 139
 140   timer2 *tx_timer;                     /* Periodic control packet timer */
 141   timer2 *hold_timer;                   /* Timer for session down detection time */
 142
 143   list request_list;                    /* List of client requests (struct bfd_request) */
 144   bird_clock_t last_state_change;       /* Time of last state change */
 145   u8 notify_running;                    /* 1 if notify hooks are running */
 146 };
 147
 148
 149 extern const char *bfd_state_names[];
 150
 151 #define BFD_STATE_ADMIN_DOWN    0
 152 #define BFD_STATE_DOWN          1
 153 #define BFD_STATE_INIT          2
 154 #define BFD_STATE_UP            3
 155
 156 #define BFD_DIAG_NOTHING        0
 157 #define BFD_DIAG_TIMEOUT        1
 158 #define BFD_DIAG_ECHO_FAILED    2
 159 #define BFD_DIAG_NEIGHBOR_DOWN  3
 160 #define BFD_DIAG_FWD_RESET      4
 161 #define BFD_DIAG_PATH_DOWN      5
 162 #define BFD_DIAG_C_PATH_DOWN    6
 163 #define BFD_DIAG_ADMIN_DOWN     7
 164 #define BFD_DIAG_RC_PATH_DOWN   8
 165
 166 #define BFD_POLL_TX             1
 167 #define BFD_POLL_RX             2
 168
 169 #define BFD_FLAGS               0x3f
 170 #define BFD_FLAG_POLL           (1 << 5)
 171 #define BFD_FLAG_FINAL          (1 << 4)
 172 #define BFD_FLAG_CPI            (1 << 3)
 173 #define BFD_FLAG_AP             (1 << 2)
 174 #define BFD_FLAG_DEMAND         (1 << 1)
 175 #define BFD_FLAG_MULTIPOINT     (1 << 0)
 176
 177
 178 static inline void bfd_lock_sessions(struct bfd_proto *p) { pthread_spin_lock(&p->lock); }
 179 static inline void bfd_unlock_sessions(struct bfd_proto *p) { pthread_spin_unlock(&p->lock); }
 180
 181 /* bfd.c */
 182 struct bfd_session * bfd_find_session_by_id(struct bfd_proto *p, u32 id);
 183 struct bfd_session * bfd_find_session_by_addr(struct bfd_proto *p, ip_addr addr);
 184 void bfd_session_process_ctl(struct bfd_session *s, u8 flags, u32 old_tx_int, u32 old_rx_int);
 185 void bfd_show_sessions(struct proto *P);
 186
 187 /* packets.c */
 188 void bfd_send_ctl(struct bfd_proto *p, struct bfd_session *s, int final);
 189 sock * bfd_open_rx_sk(struct bfd_proto *p, int multihop, int inet_version);
 190 sock * bfd_open_tx_sk(struct bfd_proto *p, ip_addr local, struct iface *ifa);
 191
 192
 193 #endif /* _BIRD_BFD_H_ */