[pve-devel] [WIP v2 pve-network 06/10] ipam: Add helper methods for DHCP to PVE IPAM

[Stefan Hanreich]

Those methods are used by the DHCP plugins to attain the next free
IP address for a given DHCP range, as well as delete all entries with
a certain MAC address.

Signed-off-by: Stefan Hanreich <s.hanreich at proxmox.com>
---
 src/PVE/Network/SDN/Ipams/PVEPlugin.pm | 64 ++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/src/PVE/Network/SDN/Ipams/PVEPlugin.pm b/src/PVE/Network/SDN/Ipams/PVEPlugin.pm
index 3e8ffc5..fcc8282 100644
--- a/src/PVE/Network/SDN/Ipams/PVEPlugin.pm
+++ b/src/PVE/Network/SDN/Ipams/PVEPlugin.pm
@@ -156,6 +156,70 @@ sub add_next_freeip {
     return "$freeip/$mask";
 }
 
+sub add_dhcp_ip {
+    my ($class, $subnet, $dhcp_range, $data) = @_;
+
+    my $cidr = $subnet->{cidr};
+    my $zone = $subnet->{zone};
+
+    cfs_lock_file($ipamdb_file, undef, sub {
+	my $db = read_db();
+
+	my $dbzone = $db->{zones}->{$zone};
+	die "zone '$zone' doesn't exist in IPAM DB\n" if !$dbzone;
+
+	my $dbsubnet = $dbzone->{subnets}->{$cidr};
+	die "subnet '$cidr' doesn't exist in IPAM DB\n" if !$dbsubnet;
+
+	my $ip = new Net::IP ("$dhcp_range->{'start-address'} - $dhcp_range->{'end-address'}")
+	    or die "Invalid IP address(es) in DHCP Range!\n";
+
+	do {
+	    my $ip_address = $ip->ip();
+	    if (!$dbsubnet->{ips}->{$ip_address}) {
+		$dbsubnet->{ips}->{$ip_address} = $data;
+		write_db($db);
+
+		return $ip_address;
+	    }
+	} while (++$ip);
+
+	die "No free IP left in DHCP Range $dhcp_range->{'start-address'}:$dhcp_range->{'end-address'}}\n";
+    });
+}
+
+sub del_dhcp_ip {
+    my ($class, $subnet, $mac) = @_;
+
+    my $cidr = $subnet->{cidr};
+    my $zone = $subnet->{zone};
+
+    my $returned_ip = undef;
+
+    cfs_lock_file($ipamdb_file, undef, sub {
+	my $db = read_db();
+
+	die "zone $zone don't exist in ipam db" if !$db->{zones}->{$zone};
+	my $dbzone = $db->{zones}->{$zone};
+
+	die "subnet $cidr don't exist in ipam db" if !$dbzone->{subnets}->{$cidr};
+	my $dbsubnet = $dbzone->{subnets}->{$cidr};
+
+	foreach my $ip_address (keys %{$dbsubnet->{ips}}) {
+	    my $data = $dbsubnet->{ips}->{$ip_address};
+	    next if !$data->{mac} || $data->{mac} ne $mac;
+
+	    delete $dbsubnet->{ips}->{$ip_address};
+	    write_db($db);
+
+	    $returned_ip = $ip_address;
+	}
+    });
+    die "$@" if $@;
+
+    return $returned_ip;
+}
+
 sub del_ip {
     my ($class, $plugin_config, $subnetid, $subnet, $ip) = @_;
 
-- 
2.39.2