### Description
is_in_subnet function requires subnet param to be network address and fails for
host address in cidr notation despite it is contained in corresponding subnet.
For example, is_in_subnet("1.2.3.2", "1.2.3.0/30") returns true
but
is_in_subnet("1.2.3.2", "1.2.3.2/30") returns false, although 1.2.3.2 is
present in 1.2.3.2/30 and 1.2.3.2 is allowed IP of 1.2.3.0/30
Of course, "1.2.3.2/30" this is not actually a subnet specification and rather
is IP in CIDR notation, but sometimes it is required to check if some IP
matches specified IP with CIDR.
### Possible Solutions
It would be cool if is_in_subnet take such cases as matches. I think this
should not break anything, because host IP and CIDR always define network
containing specified host.
Another solution would be separate function with more relaxed behavior...
This happens on Kamailio 5.1 devel.
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