Where are privileged ports defined in the kernel?

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I am doing some experimentation and trying to change the range of
privileged ports in the kernel, so I could make it more restrictive
(only root can bind to ports < 10000) or less restrictive (any user can
bind to any port).  It seems like there should be a constant defined in
a .h file somewhere which controls this, but I can't find it.  I found
in /usr/include/netinet/in.h the constant  IPPORT_RESERVED = 1024 but I
can't find that anywhere in the kernel.  Can anyone point me to the
right file?

Thanks!
 



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