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
221
222
223
224
225
226
227
228
|
/*
* vrrp_periodic.c - vrrp plug-in periodic function
*
* Copyright 2019-2020 Rubicon Communications, LLC (Netgate)
*
* SPDX-License-Identifier: Apache-2.0
*
*/
#include <vlib/vlib.h>
#include <vppinfra/error.h>
#include <vrrp/vrrp.h>
#include <vrrp/vrrp_packet.h>
static int
vrrp_vr_timer_compare (const void *v1, const void *v2)
{
vrrp_main_t *vmp = &vrrp_main;
const u32 *idx1, *idx2;
vrrp_vr_timer_t *timer1, *timer2;
idx1 = v1;
idx2 = v2;
timer1 = pool_elt_at_index (vmp->vr_timers, *idx1);
timer2 = pool_elt_at_index (vmp->vr_timers, *idx2);
/* don't check equality, they are unlikely to be exactly equal and
* if it occurs, it won't matter what order they were in.
* sort the list in reverse so we can pick the next timer off the end */
if (timer1->expire_time > timer2->expire_time)
return -1;
else
return 1;
}
static u32
vrrp_vr_timer_get_next (void)
{
vrrp_main_t *vmp = &vrrp_main;
int n_timers;
n_timers = vec_len (vmp->pending_timers);
if (!n_timers)
return ~0;
return vec_elt (vmp->pending_timers, n_timers - 1);
}
/* cancel an existing timer. This could happen because:
* - adv timer expired on master. another adv should be scheduled.
* - a shutdown event is received
* - a master is preempted by a higher priority master
* - adv received on backup. master down timer should be rescheduled.
*/
void
vrrp_vr_timer_cancel (vrrp_vr_t * vr)
{
vrrp_main_t *vmp = &vrrp_main;
u32 *t;
/* don't search for a timer that was already canceled or never set */
if (vr->runtime.timer_index == ~0)
return;
/* timers stored in descending order, start at the end of the list */
/* vec_foreach_backwards does not deal with 0 pointers, check first */
if (vmp->pending_timers)
vec_foreach_backwards (t, vmp->pending_timers)
{
if (*t == vr->runtime.timer_index)
{
vec_delete (vmp->pending_timers, 1, t - vmp->pending_timers);
break;
}
}
if (!pool_is_free_index (vmp->vr_timers, vr->runtime.timer_index))
pool_put_index (vmp->vr_timers, vr->runtime.timer_index);
vr->runtime.timer_index = ~0;
vlib_process_signal_event (vmp->vlib_main, vrrp_periodic_node.index,
VRRP_EVENT_VR_TIMER_UPDATE, 0);
}
void
vrrp_vr_timer_set (vrrp_vr_t * vr, vrrp_vr_timer_type_t type)
{
vrrp_main_t *vmp = &vrrp_main;
vlib_main_t *vm = vlib_get_main ();
vrrp_vr_timer_t *timer;
f64 now;
/* Each VR should be waiting on at most 1 timer at any given time.
* If there is already a timer set for this VR, cancel it.
*/
if (vr->runtime.timer_index != ~0)
vrrp_vr_timer_cancel (vr);
pool_get (vmp->vr_timers, timer);
vr->runtime.timer_index = timer - vmp->vr_timers;
timer->vr_index = vr - vmp->vrs;
timer->type = type;
now = vlib_time_now (vm);
/* RFC 5798 specifies that timers are in centiseconds, so x / 100.0 */
switch (type)
{
case VRRP_VR_TIMER_ADV:
timer->expire_time = now + (vr->config.adv_interval / 100.0);
break;
case VRRP_VR_TIMER_MASTER_DOWN:
timer->expire_time = now + (vr->runtime.master_down_int / 100.0);
break;
default:
/* should never reach here */
clib_warning ("Unrecognized VRRP timer type (%d)", type);
return;
}
vec_add1 (vmp->pending_timers, vr->runtime.timer_index);
vec_sort_with_function (vmp->pending_timers, vrrp_vr_timer_compare);
vlib_process_signal_event (vmp->vlib_main, vrrp_periodic_node.index,
VRRP_EVENT_VR_TIMER_UPDATE, 0);
}
void
vrrp_vr_timer_timeout (u32 timer_index)
{
vrrp_main_t *vmp = &vrrp_main;
vrrp_vr_timer_t *timer;
vrrp_vr_t *vr;
if (pool_is_free_index (vmp->vr_timers, timer_index))
{
clib_warning ("Timeout on free timer index %u", timer_index);
return;
}
timer = pool_elt_at_index (vmp->vr_timers, timer_index);
vr = pool_elt_at_index (vmp->vrs, timer->vr_index);
switch (timer->type)
{
case VRRP_VR_TIMER_ADV:
vrrp_adv_send (vr, 0);
vrrp_vr_timer_set (vr, VRRP_VR_TIMER_ADV);
break;
case VRRP_VR_TIMER_MASTER_DOWN:
vrrp_vr_transition (vr, VRRP_VR_STATE_MASTER, NULL);
break;
default:
clib_warning ("Unrecognized timer type %d", timer->type);
return;
}
}
static uword
vrrp_periodic_process (vlib_main_t * vm,
vlib_node_runtime_t * rt, vlib_frame_t * f)
{
vrrp_main_t *pm = &vrrp_main;
f64 now;
f64 timeout = 10.0;
uword *event_data = 0;
uword event_type;
u32 next_timer = ~0;
vrrp_vr_timer_t *timer;
while (1)
{
now = vlib_time_now (vm);
if (next_timer == ~0)
{
vlib_process_wait_for_event (vm);
}
else
{
timer = pool_elt_at_index (pm->vr_timers, next_timer);
timeout = timer->expire_time - now;
vlib_process_wait_for_event_or_clock (vm, timeout);
}
event_type = vlib_process_get_events (vm, (uword **) & event_data);
switch (event_type)
{
/* Handle VRRP_EVENT_VR_TIMER_UPDATE */
case VRRP_EVENT_VR_TIMER_UPDATE:
next_timer = vrrp_vr_timer_get_next ();
break;
/* Handle periodic timeouts */
case ~0:
vrrp_vr_timer_timeout (next_timer);
next_timer = vrrp_vr_timer_get_next ();
break;
}
vec_reset_length (event_data);
}
return 0;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (vrrp_periodic_node) =
{
.function = vrrp_periodic_process,
.type = VLIB_NODE_TYPE_PROCESS,
.name = "vrrp-periodic-process",
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
