munet: add loopbacks-autonumber config remove by default

- The previous release included a NBC change that was auton-umbering loopback
interfaces if the user configured `networks-autonumber: true`. Change this
using a new `loopbacks-autonumber` config instead.

Signed-off-by: Christian Hopps <chopps@labn.net>

Author: choppsv1

README.org

@@ -126,6 +126,7 @@ module: labn-munet-config
   |  +--rw dns-network?              -> ../networks/name
   |  +--rw ipv6-enable?              boolean
   |  +--rw networks-autonumber?      boolean
+  |  +--rw loopbacks-autonumber?     boolean
   |  +--rw initial-setup-cmd?        string
   |  +--rw initial-setup-host-cmd?   string
   |  +--rw networks* [name]
@@ -1084,11 +1085,20 @@ munet>
 
       leaf networks-autonumber {
         type boolean;
+        default false;
         description
           "Controls if networks and node connections are given IP addresses if
            not explicitly configured.";
       }
 
+      leaf loopbacks-autonumber {
+        type boolean;
+        default false;
+        description
+          "Controls if loopbacks are given IP addresses if not explicitly
+           configured.";
+      }
+
       leaf initial-setup-cmd {
         type string;
         description

doc/source/config.rst

@@ -84,9 +84,12 @@ along with a few global topology options.
 Tree diagram for topology config::
 
    +--rw topology
-   |  +--rw dns-network?           -> ../networks/name
-   |  +--rw ipv6-enable?           boolean
-   |  +--rw networks-autonumber?   boolean
+   |  +--rw dns-network?              -> ../networks/name
+   |  +--rw ipv6-enable?              boolean
+   |  +--rw networks-autonumber?      boolean
+   |  +--rw loopbacks-autonumber?     boolean
+   |  +--rw initial-setup-cmd?        string
+   |  +--rw initial-setup-host-cmd?   string
    |  +--rw networks* [name]
    |     ... described in subsection
    |  +--rw nodes* [name]

munet/munet-schema.json

@@ -400,6 +400,9 @@
         "networks-autonumber": {
           "type": "boolean"
         },
+        "loopbacks-autonumber": {
+          "type": "boolean"
+        },
         "initial-setup-cmd": {
           "type": "string"
         },

munet/native.py

@@ -55,6 +55,10 @@
 from .watchlog import WatchLog
 
 
+AUTO_LOOPBACK_IPV4_BASE = ipaddress.ip_interface("10.255.0.0/32")
+AUTO_LOOPBACK_IPV6_BASE = ipaddress.ip_interface("fcfe::0/128")
+
+
 class L3ContainerNotRunningError(MunetError):
     """Exception if no running container exists."""
 
@@ -63,16 +67,14 @@ def get_loopback_ips(c, nid):
     ips = []
     if ip := c.get("ip"):
         if ip == "auto":
-            assert nid < 0xFFFF  # Limited to 10.255.0.0/16 block
-            ips.append(ipaddress.ip_interface("10.255.0.0/32") + nid)
+            ips.append(AUTO_LOOPBACK_IPV4_BASE + nid)
         elif isinstance(ip, str):
             ips.append(ipaddress.ip_interface(ip))
         else:
             ips.extend([ipaddress.ip_interface(x) for x in ip])
     if ipv6 := c.get("ipv6"):
         if ipv6 == "auto":
-            assert nid < 0xFFFF  # Same limit as ipv4 for simplicity
-            ips.append(ipaddress.ip_interface(f"fcfe:ffff:{nid:02x}::1/128"))
+            ips.append(AUTO_LOOPBACK_IPV6_BASE + nid)
         elif isinstance(ip, str):
             ips.append(ipaddress.ip_interface(ipv6))
         else:
@@ -797,9 +799,13 @@ def __init__(self, *args, unet=None, **kwargs):
         )
         self.next_p2p_network6 = ipaddress.ip_network(f"fcff:ffff:{self.id:02x}::/127")
 
-        if "ip" not in self.config and self.unet.autonumber:
+        if "ip" not in self.config and self.unet.autonumber_loopbacks:
             self.config["ip"] = "auto"
-        if "ipv6" not in self.config and self.unet.autonumber and self.unet.ipv6_enable:
+        if (
+            "ipv6" not in self.config
+            and self.unet.autonumber_loopbacks
+            and self.unet.ipv6_enable
+        ):
             self.config["ipv6"] = "auto"
         self.loopback_ip = None
         self.loopback_ips = get_loopback_ips(self.config, self.id)
@@ -3304,6 +3310,14 @@ def autonumber(self):
     def autonumber(self, value):
         self.topoconf["networks-autonumber"] = bool(value)
 
+    @property
+    def autonumber_loopbacks(self):
+        return self.topoconf.get("loopbacks-autonumber", False)
+
+    @autonumber_loopbacks.setter
+    def autonumber_loopbacks(self, value):
+        self.topoconf["loopbacks-autonumber"] = bool(value)
+
     async def add_dummy_link(self, node1, c1=None):
         c1 = {} if c1 is None else c1
 

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "munet"
-version = "0.17.0"
+version = "0.17.1"
 description = "A package to facilitate network simulations"
 readme = {file = "README.org", content-type = "text/plain"}
 requires-python = ">=3.9"

tests/basic/munet.yaml

@@ -1,6 +1,7 @@
 version: 1
 topology:
   networks-autonumber: true
+  loopbacks-autonumber: true
   ipv6-enable: true
   networks:
     - name: net0

tests/basic/test_basic_topology.py

@@ -77,16 +77,14 @@ async def test_autonumber_ping(unet_perfunc):
         o = await r2.async_cmd_raises("ping -w1 -c1 fcff:ffff:2::1")
         logging.debug("r2 ping r3 p2p (fcff:ffff:2::1) output: %s", o)
 
-        o = await r2.async_cmd_raises("ping -w1 -c1 fcfe:ffff:2::1")
-        logging.debug("r2 ping lo (fcfe:ffff:2::1) output: %s", o)
+        o = await r2.async_cmd_raises("ping -w1 -c1 fcfe::2")
+        logging.debug("r2 ping lo (fcfe::2) output: %s", o)
 
         o = await r1.async_cmd_nostatus("ip -6 neigh show")
         logging.info("ip -6 neigh show: %s", o)
 
 
-@pytest.mark.parametrize(
-    "unet_perfunc", ["munet"], indirect=["unet_perfunc"]
-)
+@pytest.mark.parametrize("unet_perfunc", ["munet"], indirect=["unet_perfunc"])
 async def test_basic_config(unet_perfunc):
     unet = unet_perfunc
     r3 = unet.hosts["r3"]