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More intelligent handling of first/last IPs

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This commit is contained in:
Jeremy Stretch
2016-08-03 12:30:29 -04:00
parent 79b1bbb9e1
commit 3b9ac3b986
1 changed files with 10 additions and 8 deletions
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18
netbox/ipam/views.py
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@ -39,15 +39,17 @@ def add_available_ipaddresses(prefix, ipaddress_list):
output = []
prev_ip = None
# Determine first and last usable IP
if prefix.version == 6 or (prefix.version == 4 and prefix.prefixlen == 31):
first_ip_in_prefix = netaddr.IPAddress(prefix.first)
else:
# Ignore the "network address" for IPv4 prefixes larger than /31
if prefix.version == 4 and prefix.prefixlen < 31:
first_ip_in_prefix = netaddr.IPAddress(prefix.first + 1)
if prefix.version == 6 or (prefix.version == 4 and prefix.prefixlen == 31):
last_ip_in_prefix = netaddr.IPAddress(prefix.last)
else:
first_ip_in_prefix = netaddr.IPAddress(prefix.first)
# Ignore the broadcast address for IPv4 prefixes larger than /31
if prefix.version == 4 and prefix.prefixlen < 31:
last_ip_in_prefix = netaddr.IPAddress(prefix.last - 1)
else:
last_ip_in_prefix = netaddr.IPAddress(prefix.last)
if not ipaddress_list:
return [(
@ -56,7 +58,7 @@ def add_available_ipaddresses(prefix, ipaddress_list):
)]
# Account for any available IPs before the first real IP
if ipaddress_list[0].address.ip != first_ip_in_prefix:
if ipaddress_list[0].address.ip > first_ip_in_prefix:
skipped_count = int(ipaddress_list[0].address.ip - first_ip_in_prefix)
first_skipped = '{}/{}'.format(first_ip_in_prefix, prefix.prefixlen)
output.append((skipped_count, first_skipped))
@ -72,7 +74,7 @@ def add_available_ipaddresses(prefix, ipaddress_list):
prev_ip = ip
# Include any remaining available IPs
if prev_ip.address.ip != last_ip_in_prefix:
if prev_ip.address.ip < last_ip_in_prefix:
skipped_count = int(last_ip_in_prefix - prev_ip.address.ip)
first_skipped = '{}/{}'.format(prev_ip.address.ip + 1, prefix.prefixlen)
output.append((skipped_count, first_skipped))