[PATCH ifupdown2 1/1] Correctly handle IPv6 addresses in vxlan

[DERUMIER, Alexandre]

Try to look at ifupdown2 github, their are 2 old pull request about
this (never merged/ never completed)



https://github.com/CumulusNetworks/ifupdown2/pull/172

"
For this we would need a new attribute vxlan-local-tunnelip6, we don't
want to reuse the same attribute for ipv6.
We are using netlink to configure vxlans, so it's important to use a
different attribute to set the proper netlink attribute (I don't want
to have things like if IPAddress(value).version == 6:  set
Link.IFLA_VXLAN_LOCAL
"

https://github.com/CumulusNetworks/ifupdown2/pull/182


so, at minimum, this need to use a different "vxlan-local-tunnelip6"
attribute for ipv6


-------- Message initial --------
De: apalrd <andrew at apalrd.net>
À: pve-devel at lists.proxmox.com
Cc: apalrd <andrew at apalrd.net>
Objet: [PATCH ifupdown2 1/1] Correctly handle IPv6 addresses in vxlan
Date: 08/10/2024 06:01:09

---
 ifupdown2/addons/vxlan.py | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/ifupdown2/addons/vxlan.py b/ifupdown2/addons/vxlan.py
index 084aec9..4aa8e50 100644
--- a/ifupdown2/addons/vxlan.py
+++ b/ifupdown2/addons/vxlan.py
@@ -51,7 +51,7 @@ class vxlan(Vxlan, moduleBase):
             },
             "vxlan-local-tunnelip": {
                 "help": "vxlan local tunnel ip",
-                "validvals": ["<ipv4>"],
+                "validvals": ["<ipv4>,<ipv6>"],
                 "example": ["vxlan-local-tunnelip 172.16.20.103"]
             },
             "vxlan-svcnodeip": {
@@ -66,7 +66,7 @@ class vxlan(Vxlan, moduleBase):
             },
             "vxlan-remoteip": {
                 "help": "vxlan remote ip",
-                "validvals": ["<ipv4>"],
+                "validvals": ["<ipv4>,<ipv6>"],
                 "example": ["vxlan-remoteip 172.16.22.127"],
                 "multiline": True
             },
@@ -521,7 +521,7 @@ class vxlan(Vxlan, moduleBase):
             local = self._vxlan_local_tunnelip
 
         if link_exists:
-            cached_ifla_vxlan_local =
cached_vxlan_ifla_info_data.get(Link.IFLA_VXLAN_LOCAL)
+            cached_ifla_vxlan_local =
cached_vxlan_ifla_info_data.get(Link.IFLA_VXLAN_LOCAL) or
cached_vxlan_ifla_info_data.get(Link.IFLA_VXLAN_LOCAL6)
 
             # on ifreload do not overwrite anycast_ip to individual ip
             # if clagd has modified
@@ -547,7 +547,7 @@ class vxlan(Vxlan, moduleBase):
 
         if local:
             try:
-                local = ipnetwork.IPv4Address(local)
+                local = ipnetwork.IPAddress(local)
 
                 if local.initialized_with_prefixlen:
                     self.logger.warning("%s: vxlan-local-tunnelip %s:
netmask ignored" % (ifname, local))
@@ -559,13 +559,19 @@ class vxlan(Vxlan, moduleBase):
         if local:
             if local != cached_ifla_vxlan_local:
                 self.logger.info("%s: set vxlan-local-tunnelip %s" %
(ifname, local))
-                user_request_vxlan_info_data[Link.IFLA_VXLAN_LOCAL] =
local
+                if local.version == 6:
+                   
user_request_vxlan_info_data[Link.IFLA_VXLAN_LOCAL6] = local
+                else:
+                   
user_request_vxlan_info_data[Link.IFLA_VXLAN_LOCAL] = local
 
                 # if both local-ip and anycast-ip are identical the
function prints a warning
                 self.syntax_check_localip_anycastip_equal(ifname,
local, self._clagd_vxlan_anycast_ip)
         elif cached_ifla_vxlan_local:
             self.logger.info("%s: removing vxlan-local-tunnelip (cache
%s)" % (ifname, cached_ifla_vxlan_local))
-            user_request_vxlan_info_data[Link.IFLA_VXLAN_LOCAL] = None
+            if cached_ifla_vxlan_local.version == 6:
+                user_request_vxlan_info_data[Link.IFLA_VXLAN_LOCAL6] =
None
+            else:
+                user_request_vxlan_info_data[Link.IFLA_VXLAN_LOCAL] =
None
 
         return local
 
@@ -1236,7 +1242,7 @@ class vxlan(Vxlan, moduleBase):
         if remoteips:
             try:
                 for remoteip in remoteips:
-                    ipnetwork.IPv4Address(remoteip)
+                    ipnetwork.IPAddress(remoteip)
             except Exception as e:
                 self.log_error('%s: vxlan-remoteip: %s' %
(ifaceobj.name, str(e)))
 
@@ -1244,7 +1250,7 @@ class vxlan(Vxlan, moduleBase):
         # purge any removed remote ip
         old_remoteips = self.get_old_remote_ips(ifaceobj.name)
 
-        if vxlan_purge_remotes or remoteips or (remoteips !=
old_remoteips):
+        if vxlan_purge_remotes or (isinstance(remoteips,list) and
remoteips != old_remoteips):
             # figure out the diff for remotes and do the bridge fdb
updates
             # only if provisioned by user and not by an vxlan external
             # controller.
@@ -1281,8 +1287,8 @@ class vxlan(Vxlan, moduleBase):
                         "00:00:00:00:00:00",
                         None, True, addr
                     )
-                except Exception:
-                    pass
+                except Exception as e:
+                    self.log_error('%s: vxlan-remoteip<add>: %s' %
(ifaceobj.name, str(e)))
 
         self.vxlan_remote_ip_map(ifaceobj, vxlan_mcast_grp_map)