910adaa08b
Direct BFD sessions needs to be dispatched not only by IP addresses, but also by interfaces, in order to avoid collisions between neighbors with the same IPv6 link-local addresses. Extend BFD session hash_ip key by interface index to handle that. Use 0 for multihop sessions. Thanks to Sebastian Hahn for the original patch.
227 lines
5.7 KiB
C
227 lines
5.7 KiB
C
/*
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* BIRD -- Bidirectional Forwarding Detection (BFD)
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_BFD_H_
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#define _BIRD_BFD_H_
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#include <pthread.h>
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#include "nest/bird.h"
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#include "nest/cli.h"
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#include "nest/iface.h"
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#include "nest/protocol.h"
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#include "nest/route.h"
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#include "nest/password.h"
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#include "conf/conf.h"
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#include "lib/hash.h"
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#include "lib/resource.h"
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#include "lib/socket.h"
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#include "lib/string.h"
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#include "nest/bfd.h"
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#include "io.h"
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#define BFD_CONTROL_PORT 3784
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#define BFD_ECHO_PORT 3785
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#define BFD_MULTI_CTL_PORT 4784
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#define BFD_DEFAULT_MIN_RX_INT (10 MS_)
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#define BFD_DEFAULT_MIN_TX_INT (100 MS_)
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#define BFD_DEFAULT_IDLE_TX_INT (1 S_)
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#define BFD_DEFAULT_MULTIPLIER 5
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struct bfd_iface_config;
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struct bfd_config
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{
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struct proto_config c;
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list patt_list; /* List of iface configs (struct bfd_iface_config) */
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list neigh_list; /* List of configured neighbors (struct bfd_neighbor) */
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struct bfd_iface_config *multihop; /* Multihop pseudoiface config */
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u8 accept_ipv4;
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u8 accept_ipv6;
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u8 accept_direct;
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u8 accept_multihop;
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};
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struct bfd_iface_config
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{
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struct iface_patt i;
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u32 min_rx_int;
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u32 min_tx_int;
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u32 idle_tx_int;
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u8 multiplier;
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u8 passive;
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u8 auth_type; /* Authentication type (BFD_AUTH_*) */
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list *passwords; /* Passwords for authentication */
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};
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struct bfd_session_config
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{
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u32 min_rx_int;
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u32 min_tx_int;
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u32 idle_tx_int;
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u8 multiplier;
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u8 passive;
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};
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struct bfd_neighbor
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{
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node n;
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ip_addr addr;
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ip_addr local;
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struct iface *iface;
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struct neighbor *neigh;
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struct bfd_request *req;
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u8 multihop;
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u8 active;
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};
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struct bfd_proto
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{
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struct proto p;
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struct birdloop *loop;
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pool *tpool;
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pthread_spinlock_t lock;
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node bfd_node;
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slab *session_slab;
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HASH(struct bfd_session) session_hash_id;
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HASH(struct bfd_session) session_hash_ip;
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sock *notify_rs;
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sock *notify_ws;
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list notify_list;
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sock *rx4_1;
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sock *rx6_1;
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sock *rx4_m;
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sock *rx6_m;
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list iface_list;
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};
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struct bfd_iface
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{
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node n;
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ip_addr local;
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struct iface *iface;
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struct bfd_iface_config *cf;
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struct bfd_proto *bfd;
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sock *sk;
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u32 uc;
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u8 changed;
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};
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struct bfd_session
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{
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node n;
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ip_addr addr; /* Address of session */
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struct bfd_iface *ifa; /* Iface associated with session */
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struct bfd_session *next_id; /* Next in bfd.session_hash_id */
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struct bfd_session *next_ip; /* Next in bfd.session_hash_ip */
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u8 opened_unused;
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u8 passive;
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u8 poll_active;
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u8 poll_scheduled;
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u8 loc_state;
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u8 rem_state;
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u8 loc_diag;
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u8 rem_diag;
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u32 loc_id; /* Local session ID (local discriminator) */
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u32 rem_id; /* Remote session ID (remote discriminator) */
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struct bfd_session_config cf; /* Static configuration parameters */
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u32 des_min_tx_int; /* Desired min rx interval, local option */
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u32 des_min_tx_new; /* Used for des_min_tx_int change */
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u32 req_min_rx_int; /* Required min tx interval, local option */
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u32 req_min_rx_new; /* Used for req_min_rx_int change */
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u32 rem_min_tx_int; /* Last received des_min_tx_int */
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u32 rem_min_rx_int; /* Last received req_min_rx_int */
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u8 demand_mode; /* Currently unused */
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u8 rem_demand_mode;
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u8 detect_mult; /* Announced detect_mult, local option */
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u8 rem_detect_mult; /* Last received detect_mult */
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uint ifindex; /* Iface index, for hashing in bfd.session_hash_ip */
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btime last_tx; /* Time of last sent periodic control packet */
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btime last_rx; /* Time of last received valid control packet */
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timer *tx_timer; /* Periodic control packet timer */
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timer *hold_timer; /* Timer for session down detection time */
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list request_list; /* List of client requests (struct bfd_request) */
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btime last_state_change; /* Time of last state change */
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u8 notify_running; /* 1 if notify hooks are running */
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u8 rx_csn_known; /* Received crypto sequence number is known */
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u32 rx_csn; /* Last received crypto sequence number */
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u32 tx_csn; /* Last transmitted crypto sequence number */
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u32 tx_csn_time; /* Timestamp of last tx_csn change */
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};
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extern const char *bfd_state_names[];
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#define BFD_STATE_ADMIN_DOWN 0
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#define BFD_STATE_DOWN 1
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#define BFD_STATE_INIT 2
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#define BFD_STATE_UP 3
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#define BFD_DIAG_NOTHING 0
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#define BFD_DIAG_TIMEOUT 1
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#define BFD_DIAG_ECHO_FAILED 2
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#define BFD_DIAG_NEIGHBOR_DOWN 3
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#define BFD_DIAG_FWD_RESET 4
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#define BFD_DIAG_PATH_DOWN 5
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#define BFD_DIAG_C_PATH_DOWN 6
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#define BFD_DIAG_ADMIN_DOWN 7
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#define BFD_DIAG_RC_PATH_DOWN 8
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#define BFD_POLL_TX 1
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#define BFD_POLL_RX 2
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#define BFD_FLAGS 0x3f
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#define BFD_FLAG_POLL (1 << 5)
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#define BFD_FLAG_FINAL (1 << 4)
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#define BFD_FLAG_CPI (1 << 3)
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#define BFD_FLAG_AP (1 << 2)
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#define BFD_FLAG_DEMAND (1 << 1)
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#define BFD_FLAG_MULTIPOINT (1 << 0)
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#define BFD_AUTH_NONE 0
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#define BFD_AUTH_SIMPLE 1
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#define BFD_AUTH_KEYED_MD5 2
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#define BFD_AUTH_METICULOUS_KEYED_MD5 3
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#define BFD_AUTH_KEYED_SHA1 4
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#define BFD_AUTH_METICULOUS_KEYED_SHA1 5
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extern const u8 bfd_auth_type_to_hash_alg[];
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static inline void bfd_lock_sessions(struct bfd_proto *p) { pthread_spin_lock(&p->lock); }
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static inline void bfd_unlock_sessions(struct bfd_proto *p) { pthread_spin_unlock(&p->lock); }
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/* bfd.c */
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struct bfd_session * bfd_find_session_by_id(struct bfd_proto *p, u32 id);
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struct bfd_session * bfd_find_session_by_addr(struct bfd_proto *p, ip_addr addr, uint ifindex);
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void bfd_session_process_ctl(struct bfd_session *s, u8 flags, u32 old_tx_int, u32 old_rx_int);
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void bfd_show_sessions(struct proto *P);
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/* packets.c */
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void bfd_send_ctl(struct bfd_proto *p, struct bfd_session *s, int final);
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sock * bfd_open_rx_sk(struct bfd_proto *p, int multihop, int inet_version);
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sock * bfd_open_tx_sk(struct bfd_proto *p, ip_addr local, struct iface *ifa);
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#endif /* _BIRD_BFD_H_ */
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