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sources: add option to limit selection of unreachable sources

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Add maxunreach option to NTP sources and refclocks to specify the
maximum number of polls that the source can stay selected for
synchronization when it is unreachable (i.e. no valid sample was
received in the last 8 polls).

It is an additional requirement to having at least one sample more
recent than the oldest sample of reachable sources.

The default value is 100000. Setting the option to 0 disables selection
of unreachable sources, which matches RFC 5905.
This commit is contained in:
Miroslav Lichvar
2025-08-05 16:08:40 +02:00
parent be7f5e8916
commit 9b183fe98f
16 changed files with 108 additions and 15 deletions
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2
srcparams.h
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@@ -49,6 +49,7 @@ typedef struct {
int max_sources;
int min_samples;
int max_samples;
int max_unreach;
int filter_length;
int interleaved;
int sel_options;
@@ -79,6 +80,7 @@ typedef struct {
#define SRC_DEFAULT_MAXSOURCES 4
#define SRC_DEFAULT_MINSAMPLES (-1)
#define SRC_DEFAULT_MAXSAMPLES (-1)
#define SRC_DEFAULT_MAXUNREACH 100000
#define SRC_DEFAULT_ASYMMETRY 1.0
#define SRC_DEFAULT_NTSPORT 4460
#define SRC_DEFAULT_CERTSET 0