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ntp: add server support for KoD RATE

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Add "kod" option to the ratelimit directive to respond with the KoD
RATE code to randomly selected requests exceeding the configured limit.
This complements the client support of KoD RATE. It's disabled by
default.

There can be only one KoD code in one response. If both NTS NAK and RATE
codes are triggered, drop the response. The KoD RATE code can be set in
an NTS-authenticated response.
This commit is contained in:
Miroslav Lichvar
2024-04-02 15:25:51 +02:00
parent aac898343e
commit 24d28cd679
6 changed files with 41 additions and 11 deletions
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conf.h
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@@ -115,7 +115,7 @@ extern void CNF_SetupAccessRestrictions(void);
extern int CNF_GetSchedPriority(void);
extern int CNF_GetLockMemory(void);
extern int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak);
extern int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak, int *kod);
extern int CNF_GetNtsRateLimit(int *interval, int *burst, int *leak);
extern int CNF_GetCommandRateLimit(int *interval, int *burst, int *leak);
extern void CNF_GetSmooth(double *max_freq, double *max_wander, int *leap_only);