Where does $remote_addr come from?

[Paul Nickerson]

According to NGINX documentation, $remote_addr is an embedded variable in
the ngx_http_core_module module. I have searched all around, including the
source code, trying to figure out exactly how NGINX generates this
variable, but I have been unable to find anything beyond the description
"client address". Currently, my best guess is that it's the source address
field in the incoming TCP/IP packet's IPv4 internet header. Is this
correct? Or, does it come from somewhere else?

Relevant documentation:
http://nginx.org/en/docs/http/ngx_http_core_module.html#variables

Thank you,
-- Paul Nickerson

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