sdn: ipam: add method for generating ipsets

For every guest that has at least one entry in the IPAM we generate an
ipset with the name `+sdn/guest-ipam-{vmid}`. The ipset contains all
IPs from all zones for a guest with {vmid}.

Signed-off-by: Stefan Hanreich <s.hanreich@proxmox.com>

proxmox-ve-config/src/firewall/types/address.rs

@@ -108,6 +108,15 @@ impl From<Ipv6Cidr> for Cidr {
     }
 }
 
+impl From<IpAddr> for Cidr {
+    fn from(value: IpAddr) -> Self {
+        match value {
+            IpAddr::V4(addr) => Ipv4Cidr::from(addr).into(),
+            IpAddr::V6(addr) => Ipv6Cidr::from(addr).into(),
+        }
+    }
+}
+
 const IPV4_LENGTH: u8 = 32;
 
 #[derive(Clone, Copy, Debug, PartialOrd, Ord, PartialEq, Eq, Hash)]

proxmox-ve-config/src/sdn/ipam.rs

@@ -8,7 +8,11 @@ use std::{
 use serde::Deserialize;
 
 use crate::{
-    firewall::types::Cidr,
+    common::Allowlist,
+    firewall::types::{
+        ipset::{IpsetEntry, IpsetScope},
+        Cidr, Ipset,
+    },
     guest::{types::Vmid, vm::MacAddress},
     sdn::{SdnNameError, SubnetName, ZoneName},
 };
@@ -309,6 +313,40 @@ impl Ipam {
     }
 }
 
+impl Ipam {
+    /// Generates an [`Ipset`] for all guests with at least one entry in the IPAM.
+    ///
+    /// # Arguments
+    /// * `filter` - A [`Allowlist<Vmid>`] for which IPsets should get returned
+    ///
+    /// It contains all IPs in all VNets, that a guest has stored in IPAM.
+    /// Ipset name is of the form `guest-ipam-<vmid>`
+    pub fn ipsets(&self, filter: Option<&Allowlist<Vmid>>) -> impl Iterator<Item = Ipset> + '_ {
+        self.entries
+            .iter()
+            .flat_map(|(_, entries)| entries.iter())
+            .filter_map(|entry| {
+                if let IpamData::Vm(data) = &entry.data() {
+                    if filter.is_none_or(|list| list.is_allowed(&data.vmid)) {
+                        return Some(data);
+                    }
+                }
+
+                None
+            })
+            .fold(HashMap::<Vmid, Ipset>::new(), |mut acc, entry| {
+                acc.entry(entry.vmid)
+                    .or_insert_with(|| {
+                        Ipset::from_parts(IpsetScope::Sdn, format!("guest-ipam-{}", entry.vmid))
+                    })
+                    .push(IpsetEntry::from(entry.ip));
+
+                acc
+            })
+            .into_values()
+    }
+}
+
 impl TryFrom<IpamJson> for Ipam {
     type Error = IpamError;