80 lines
1.9 KiB
Awk
80 lines
1.9 KiB
Awk
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function print_prefix(prefix, count, status) {
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printf "%-20s%-10s%s\n", prefix, count, status
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}
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function d2b(d, b) {
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while(d) {
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b=d%2b
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d=int(d/2)
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}
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return b
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}
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function ip2dec(prefix) {
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split(prefix, splitted_prefix, ".")
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b1 = splitted_prefix[1] * 256^3
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b2 = splitted_prefix[2] * 256^2
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b3 = splitted_prefix[3] * 256
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b4 = splitted_prefix[4]
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return b1 + b2 + b3 + b4
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}
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function dec2ip(dec_prefix) {
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b1 = int(dec_prefix/256^3) % 256
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b2 = int(dec_prefix/256^2) % 256
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b3 = int(dec_prefix/256) % 256
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b4 = int(dec_prefix) % 256
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return b1 "." b2 "." b3 "." b4
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}
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function compute_prefix(prefix, count, status, count_alloc) {
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split(prefix, bytes, ".")
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# Everything in 151.216.0.0/13 is reserved for temporary assignments
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if(bytes[1] == 151 && bytes[2] >= 216 && bytes[2] <= 223) {
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return 0
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}
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# Everything in 185.0.0.0/15 is reserved for IXP assignments
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if(bytes[1] == 185 && bytes[2] <= 1) {
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return 0
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}
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for(i = 4; i >= 0; i--) {
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if(bytes[i] != 0) {
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bin = d2b(bytes[i])
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idx = match(bin, /0*$/)
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host_bytes = 1 substr(bin, idx, 9 - idx)
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split(host_bytes, msb, "")
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max_count = 2^(length(msb) - 1) * 256 ^ (4 - i)
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if(max_count > count) {
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max_count = count
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}
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cidr = 32 - log(max_count)/log(2)
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remainder = count - max_count
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if(cidr <= 24) {
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print_prefix(prefix "/" cidr, max_count, status)
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count_alloc = count_alloc + 2^(24-cidr)
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}
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if(remainder > 0) {
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new_prefix = dec2ip(ip2dec(prefix) + max_count)
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count_alloc = count_alloc + compute_prefix(new_prefix, remainder, status, count_alloc)
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}
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return count_alloc
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}
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}
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}
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BEGIN {
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FS = "|"
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print_prefix("Prefix", "Addresses", "Status")
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count_alloc = 0
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}
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$3 == "ipv4" && $7 ~ /(reserved|available)/ && $5 >= 256 {
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count_alloc = compute_prefix($4, $5, $7, count_alloc)
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}
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END {
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print "Number of /24 available for future allocation: " count_alloc
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}
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