network: get_local_ip_from_cidr: return unique IPs

to avoid erroring out when "multiple" addresses are configured on live
migration, when in fact it's the same IP multiple times.

Seems like the same problem for a caller in pve-cluster was fixed by checking
the uniqueness afterwards, see commit 266041169beb36c8892ca54265e2d91335307ffb
in pve-cluster. But there doesn't seem to be any caller relying on the current
behavior, and no additional information other than the addresses are returned,
so fix it here.

Reported here:
https://forum.proxmox.com/threads/live-migration-of-vms-via-full-mesh-network-could-not-get-ip-multiple-addresses-configured-on-local-node-for-network.84585/

Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>

diff --git a/src/PVE/Network.pm b/src/PVE/Network.pm
index 12536c7609e9cc58182e97e8672ccd00e12ade72..3b1afdd1dfa8c4912e82265e36409b3c032944be 100644 (file)
--- a/src/PVE/Network.pm
+++ b/src/PVE/Network.pm
@@ -599,14 +599,14 @@ sub is_ip_in_cidr {
 sub get_local_ip_from_cidr {
     my ($cidr) = @_;
 
-    my $IPs = [];
+    my $IPs = {};
     run_command(['/sbin/ip', 'address', 'show', 'to', $cidr, 'up'], outfunc => sub {
        if ($_[0] =~ m!^\s*inet(?:6)?\s+($PVE::Tools::IPRE)(?:/\d+|\s+peer\s+)!) {
-           push @$IPs, $1;
+           $IPs->{$1} = 1;
        }
     });
 
-    return $IPs;
+    return [ keys %{$IPs} ];
 }
 
 sub addr_to_ip {