1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
* 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 */
u32 required_min_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 */
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 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:
*/
|
