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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
test/simulation/110-chronyc
View File

@@ -114,7 +114,7 @@ limit=1
for chronyc_conf in \
"accheck 1.2.3.4" \
"add peer 10.0.0.0 minpoll 2 maxpoll 6" \
"add server 10.0.0.0 minpoll 6 maxpoll 10 iburst burst key 1 certset 2 maxdelay 1e-3 maxdelayratio 10.0 maxdelaydevratio 10.0 maxdelayquant 0.5 mindelay 1e-4 asymmetry 0.5 offset 1e-5 minsamples 6 maxsamples 6 filter 3 offline auto_offline prefer noselect trust require xleave polltarget 20 port 123 presend 7 minstratum 3 version 4 nts ntsport 4460 copy extfield F323 extfield F324 ipv6 ipv4" \
"add server 10.0.0.0 minpoll 6 maxpoll 10 iburst burst key 1 certset 2 maxdelay 1e-3 maxdelayratio 10.0 maxdelaydevratio 10.0 maxdelayquant 0.5 mindelay 1e-4 asymmetry 0.5 offset 1e-5 minsamples 6 maxsamples 6 maxunreach 8 filter 3 offline auto_offline prefer noselect trust require xleave polltarget 20 port 123 presend 7 minstratum 3 version 4 nts ntsport 4460 copy extfield F323 extfield F324 ipv6 ipv4" \
"add server node1.net1.clk" \
"allow 1.2.3.4" \
"allow 1.2" \

43
test/simulation/150-maxunreach Executable file
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@@ -0,0 +1,43 @@
#!/usr/bin/env bash
. ./test.common
test_start "maxunreach option"
limit=5000
servers=2
client_server_options="minpoll 6 maxpoll 6 minsamples 64"
base_delay=$(cat <<-EOF | tr -d '\n'
(+ 1e-4
(* -1
(equal 0.1 from 3)
(equal 0.1 to 1)
(equal 0.1 (min time 2000) 2000))
(* 0.5
(+ (equal 0.1 from 2)
(equal 0.1 to 2))))
EOF
)
run_test || test_fail
check_chronyd_exit || test_fail
check_source_selection || test_fail
check_packet_interval || test_fail
check_sync || test_fail
check_log_messages "Selected source 192.168.123.1" 1 1 || test_fail
check_log_messages "Selected source 192.168.123.2" 0 0 || test_fail
client_server_options="minpoll 6 maxpoll 6 minsamples 64 maxunreach 10"
run_test || test_fail
check_chronyd_exit || test_fail
check_source_selection || test_fail
check_packet_interval || test_fail
check_sync || test_fail
check_log_messages "Selected source 192.168.123.1" 1 1 || test_fail
check_log_messages "Selected source 192.168.123.2" 1 1 || test_fail
check_log_messages "00:52:..Z Selected source 192.168.123.2" 1 1 || test_fail
test_pass