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 "nest/password.h"
18: #include "conf/conf.h"
19: #include "lib/hash.h"
20: #include "lib/resource.h"
21: #include "lib/socket.h"
22: #include "lib/string.h"
23:
24: #include "nest/bfd.h"
25: #include "io.h"
26:
27:
28: #define BFD_CONTROL_PORT 3784
29: #define BFD_ECHO_PORT 3785
30: #define BFD_MULTI_CTL_PORT 4784
31:
32: #define BFD_DEFAULT_MIN_RX_INT (10 MS_)
33: #define BFD_DEFAULT_MIN_TX_INT (100 MS_)
34: #define BFD_DEFAULT_IDLE_TX_INT (1 S_)
35: #define BFD_DEFAULT_MULTIPLIER 5
36:
37:
38: struct bfd_iface_config;
39:
40: struct bfd_config
41: {
42: struct proto_config c;
43: list patt_list; /* List of iface configs (struct bfd_iface_config) */
44: list neigh_list; /* List of configured neighbors (struct bfd_neighbor) */
45: struct bfd_iface_config *multihop; /* Multihop pseudoiface config */
46: };
47:
48: struct bfd_iface_config
49: {
50: struct iface_patt i;
51: u32 min_rx_int;
52: u32 min_tx_int;
53: u32 idle_tx_int;
54: u8 multiplier;
55: u8 passive;
56: u8 auth_type; /* Authentication type (BFD_AUTH_*) */
57: list *passwords; /* Passwords for authentication */
58: };
59:
60: struct bfd_neighbor
61: {
62: node n;
63: ip_addr addr;
64: ip_addr local;
65: struct iface *iface;
66:
67: struct neighbor *neigh;
68: struct bfd_request *req;
69:
70: u8 multihop;
71: u8 active;
72: };
73:
74: struct bfd_proto
75: {
76: struct proto p;
77: struct birdloop *loop;
78: pool *tpool;
79: pthread_spinlock_t lock;
80: node bfd_node;
81:
82: slab *session_slab;
83: HASH(struct bfd_session) session_hash_id;
84: HASH(struct bfd_session) session_hash_ip;
85:
86: sock *notify_rs;
87: sock *notify_ws;
88: list notify_list;
89:
90: sock *rx_1;
91: sock *rx_m;
92: list iface_list;
93: };
94:
95: struct bfd_iface
96: {
97: node n;
98: ip_addr local;
99: struct iface *iface;
100: struct bfd_iface_config *cf;
101: struct bfd_proto *bfd;
102:
103: sock *sk;
104: u32 uc;
105: u8 changed;
106: };
107:
108: struct bfd_session
109: {
110: node n;
111: ip_addr addr; /* Address of session */
112: struct bfd_iface *ifa; /* Iface associated with session */
113: struct bfd_session *next_id; /* Next in bfd.session_hash_id */
114: struct bfd_session *next_ip; /* Next in bfd.session_hash_ip */
115:
116: u8 opened_unused;
117: u8 passive;
118: u8 poll_active;
119: u8 poll_scheduled;
120:
121: u8 loc_state;
122: u8 rem_state;
123: u8 loc_diag;
124: u8 rem_diag;
125: u32 loc_id; /* Local session ID (local discriminator) */
126: u32 rem_id; /* Remote session ID (remote discriminator) */
127: u32 des_min_tx_int; /* Desired min rx interval, local option */
128: u32 des_min_tx_new; /* Used for des_min_tx_int change */
129: u32 req_min_rx_int; /* Required min tx interval, local option */
130: u32 req_min_rx_new; /* Used for req_min_rx_int change */
131: u32 rem_min_tx_int; /* Last received des_min_tx_int */
132: u32 rem_min_rx_int; /* Last received req_min_rx_int */
133: u8 demand_mode; /* Currently unused */
134: u8 rem_demand_mode;
135: u8 detect_mult; /* Announced detect_mult, local option */
136: u8 rem_detect_mult; /* Last received detect_mult */
137:
138: btime last_tx; /* Time of last sent periodic control packet */
139: btime last_rx; /* Time of last received valid control packet */
140:
141: timer2 *tx_timer; /* Periodic control packet timer */
142: timer2 *hold_timer; /* Timer for session down detection time */
143:
144: list request_list; /* List of client requests (struct bfd_request) */
145: bird_clock_t last_state_change; /* Time of last state change */
146: u8 notify_running; /* 1 if notify hooks are running */
147:
148: u8 rx_csn_known; /* Received crypto sequence number is known */
149: u32 rx_csn; /* Last received crypto sequence number */
150: u32 tx_csn; /* Last transmitted crypto sequence number */
151: u32 tx_csn_time; /* Timestamp of last tx_csn change */
152: };
153:
154:
155: extern const char *bfd_state_names[];
156:
157: #define BFD_STATE_ADMIN_DOWN 0
158: #define BFD_STATE_DOWN 1
159: #define BFD_STATE_INIT 2
160: #define BFD_STATE_UP 3
161:
162: #define BFD_DIAG_NOTHING 0
163: #define BFD_DIAG_TIMEOUT 1
164: #define BFD_DIAG_ECHO_FAILED 2
165: #define BFD_DIAG_NEIGHBOR_DOWN 3
166: #define BFD_DIAG_FWD_RESET 4
167: #define BFD_DIAG_PATH_DOWN 5
168: #define BFD_DIAG_C_PATH_DOWN 6
169: #define BFD_DIAG_ADMIN_DOWN 7
170: #define BFD_DIAG_RC_PATH_DOWN 8
171:
172: #define BFD_POLL_TX 1
173: #define BFD_POLL_RX 2
174:
175: #define BFD_FLAGS 0x3f
176: #define BFD_FLAG_POLL (1 << 5)
177: #define BFD_FLAG_FINAL (1 << 4)
178: #define BFD_FLAG_CPI (1 << 3)
179: #define BFD_FLAG_AP (1 << 2)
180: #define BFD_FLAG_DEMAND (1 << 1)
181: #define BFD_FLAG_MULTIPOINT (1 << 0)
182:
183: #define BFD_AUTH_NONE 0
184: #define BFD_AUTH_SIMPLE 1
185: #define BFD_AUTH_KEYED_MD5 2
186: #define BFD_AUTH_METICULOUS_KEYED_MD5 3
187: #define BFD_AUTH_KEYED_SHA1 4
188: #define BFD_AUTH_METICULOUS_KEYED_SHA1 5
189:
190: extern const u8 bfd_auth_type_to_hash_alg[];
191:
192:
193: static inline void bfd_lock_sessions(struct bfd_proto *p) { pthread_spin_lock(&p->lock); }
194: static inline void bfd_unlock_sessions(struct bfd_proto *p) { pthread_spin_unlock(&p->lock); }
195:
196: /* bfd.c */
197: struct bfd_session * bfd_find_session_by_id(struct bfd_proto *p, u32 id);
198: struct bfd_session * bfd_find_session_by_addr(struct bfd_proto *p, ip_addr addr);
199: void bfd_session_process_ctl(struct bfd_session *s, u8 flags, u32 old_tx_int, u32 old_rx_int);
200: void bfd_show_sessions(struct proto *P);
201:
202: /* packets.c */
203: void bfd_send_ctl(struct bfd_proto *p, struct bfd_session *s, int final);
204: sock * bfd_open_rx_sk(struct bfd_proto *p, int multihop);
205: sock * bfd_open_tx_sk(struct bfd_proto *p, ip_addr local, struct iface *ifa);
206:
207:
208: #endif /* _BIRD_BFD_H_ */
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