Module: OpenASN::SpecialRanges

Defined in:
lib/openasn/special_ranges.rb

Overview

Hardcoded special-purpose ranges, checked before any data layer. These are IANA facts, not data: they never change with dataset updates.

Constant Summary collapse

V4 = 
table([
  ["0.0.0.0/8",      :private, :special_reserved],
  ["10.0.0.0/8",     :private, :special_rfc1918],
  ["100.64.0.0/10",  :cgnat,   :special_cgnat],      # RFC 6598 shared address space
  ["127.0.0.0/8",    :private, :special_loopback],
  ["169.254.0.0/16", :private, :special_link_local],
  ["172.16.0.0/12",  :private, :special_rfc1918],
  ["192.168.0.0/16", :private, :special_rfc1918],
  ["224.0.0.0/4",    :private, :special_multicast],
  ["240.0.0.0/4",    :private, :special_reserved]
]).freeze
V6 = 
table([
  ["::1/128",   :private, :special_loopback],
  ["fc00::/7",  :private, :special_ula],
  ["fe80::/10", :private, :special_link_local]
]).freeze

Class Method Summary collapse

Class Method Details

.match(ip_int, family) ⇒ Object

-> [verdict, rule] | nil. Linear scan is optimal here: 9 rows max, sorted so RFC1918/loopback hits early; measured faster than any cleverer structure at this size.



37
38
39
40
41
42
 
# File 'lib/openasn/special_ranges.rb', line 37

def self.match(ip_int, family)
  (family == :ipv4 ? V4 : V6).each do |(s, e, verdict, rule)|
    return [verdict, rule] if ip_int >= s && ip_int <= e
  end
  nil
end

.table(cidrs) ⇒ Object 



9
10
11
12
13
14
 
# File 'lib/openasn/special_ranges.rb', line 9

def self.table(cidrs)
  cidrs.map do |(cidr, verdict, rule)|
    r = IPAddr.new(cidr).to_range
    [r.first.to_i, r.last.to_i, verdict, rule].freeze
  end.freeze
end