[pve-devel] [PATCH proxmox-firewall v3 02/14] firewall: add connmark rule with VMID to all guest chains

From: Christoph Heiss <c.heiss@proxmox.com>
To: pve-devel@lists.proxmox.com
Subject: [pve-devel] [PATCH proxmox-firewall v3 02/14] firewall: add connmark rule with VMID to all guest chains
Date: Thu,  3 Jul 2025 13:54:04 +0200	[thread overview]
Message-ID: <20250703115621.883244-3-c.heiss@proxmox.com> (raw)
In-Reply-To: <20250703115621.883244-1-c.heiss@proxmox.com>

Adds a conntrack attribute with the VMID inside to anything flowing
in/out the guest.

This enables filtering/differentiating conntrack entries between VMs for
live-migration.

Signed-off-by: Christoph Heiss <c.heiss@proxmox.com>
---
Changes v1 -> v2:
  * rebased on latest master

Changes v2 -> v3:
  * no changes

 proxmox-firewall/src/firewall.rs              | 14 +++-
 .../integration_tests__firewall.snap          | 84 +++++++++++++++++++
 proxmox-nftables/src/expression.rs            |  9 ++
 proxmox-nftables/src/statement.rs             | 10 ++-
 4 files changed, 114 insertions(+), 3 deletions(-)

diff --git a/proxmox-firewall/src/firewall.rs b/proxmox-firewall/src/firewall.rs
index 086b96c..d782fcb 100644
--- a/proxmox-firewall/src/firewall.rs
+++ b/proxmox-firewall/src/firewall.rs
@@ -6,7 +6,9 @@ use anyhow::{bail, Error};
 use proxmox_nftables::command::{Add, Commands, Delete, Flush};
 use proxmox_nftables::expression::{Meta, Payload};
 use proxmox_nftables::helper::NfVec;
-use proxmox_nftables::statement::{AnonymousLimit, Log, LogLevel, Match, Set, SetOperation};
+use proxmox_nftables::statement::{
+    AnonymousLimit, Log, LogLevel, Mangle, Match, Set, SetOperation,
+};
 use proxmox_nftables::types::{
     AddElement, AddRule, ChainPart, MapValue, RateTimescale, SetName, TableFamily, TableName,
     TablePart, Verdict,
@@ -944,7 +946,15 @@ impl Firewall {
             vmid: Some(vmid),
         };
 
-        commands.reserve(config.rules().len());
+        commands.reserve(config.rules().len() + 1);
+
+        // Add a CONNMARK to anything in/out the guest, to be able to later
+        // track/filter traffic per guest, e.g. in pve-dbus-vmstate.
+        // Need to be first, such that it is always applied.
+        commands.push(Add::rule(AddRule::from_statement(
+            chain.clone(),
+            Mangle::ct_mark(vmid),
+        )));
 
         for config_rule in config.rules() {
             for rule in NftRule::from_config_rule(config_rule, &env)? {
diff --git a/proxmox-firewall/tests/snapshots/integration_tests__firewall.snap b/proxmox-firewall/tests/snapshots/integration_tests__firewall.snap
index ad54ad0..e3db8ae 100644
--- a/proxmox-firewall/tests/snapshots/integration_tests__firewall.snap
+++ b/proxmox-firewall/tests/snapshots/integration_tests__firewall.snap
@@ -4489,6 +4489,27 @@ expression: "firewall.full_host_fw().expect(\"firewall can be generated\")"
         }
       }
     },
+    {
+      "add": {
+        "rule": {
+          "family": "bridge",
+          "table": "proxmox-firewall-guests",
+          "chain": "guest-100-in",
+          "expr": [
+            {
+              "mangle": {
+                "key": {
+                  "ct": {
+                    "key": "mark"
+                  }
+                },
+                "value": 100
+              }
+            }
+          ]
+        }
+      }
+    },
     {
       "add": {
         "rule": {
@@ -4764,6 +4785,27 @@ expression: "firewall.full_host_fw().expect(\"firewall can be generated\")"
         }
       }
     },
+    {
+      "add": {
+        "rule": {
+          "family": "bridge",
+          "table": "proxmox-firewall-guests",
+          "chain": "guest-100-out",
+          "expr": [
+            {
+              "mangle": {
+                "key": {
+                  "ct": {
+                    "key": "mark"
+                  }
+                },
+                "value": 100
+              }
+            }
+          ]
+        }
+      }
+    },
     {
       "add": {
         "rule": {
@@ -5150,6 +5192,27 @@ expression: "firewall.full_host_fw().expect(\"firewall can be generated\")"
         }
       }
     },
+    {
+      "add": {
+        "rule": {
+          "family": "bridge",
+          "table": "proxmox-firewall-guests",
+          "chain": "guest-101-in",
+          "expr": [
+            {
+              "mangle": {
+                "key": {
+                  "ct": {
+                    "key": "mark"
+                  }
+                },
+                "value": 101
+              }
+            }
+          ]
+        }
+      }
+    },
     {
       "add": {
         "rule": {
@@ -5212,6 +5275,27 @@ expression: "firewall.full_host_fw().expect(\"firewall can be generated\")"
         }
       }
     },
+    {
+      "add": {
+        "rule": {
+          "family": "bridge",
+          "table": "proxmox-firewall-guests",
+          "chain": "guest-101-out",
+          "expr": [
+            {
+              "mangle": {
+                "key": {
+                  "ct": {
+                    "key": "mark"
+                  }
+                },
+                "value": 101
+              }
+            }
+          ]
+        }
+      }
+    },
     {
       "add": {
         "rule": {
diff --git a/proxmox-nftables/src/expression.rs b/proxmox-nftables/src/expression.rs
index e9ef94f..cbafe85 100644
--- a/proxmox-nftables/src/expression.rs
+++ b/proxmox-nftables/src/expression.rs
@@ -12,6 +12,8 @@ use proxmox_ve_config::firewall::types::port::{PortEntry, PortList};
 use proxmox_ve_config::firewall::types::rule_match::{IcmpCode, IcmpType, Icmpv6Code, Icmpv6Type};
 #[cfg(feature = "config-ext")]
 use proxmox_ve_config::firewall::types::Cidr;
+#[cfg(feature = "config-ext")]
+use proxmox_ve_config::guest::types::Vmid;
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
 #[serde(rename_all = "lowercase")]
@@ -267,6 +269,13 @@ impl From<&BridgeName> for Expression {
     }
 }
 
+#[cfg(feature = "config-ext")]
+impl From<Vmid> for Expression {
+    fn from(value: Vmid) -> Self {
+        Expression::Number(value.raw_value().into())
+    }
+}
+
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct Meta {
     key: String,
diff --git a/proxmox-nftables/src/statement.rs b/proxmox-nftables/src/statement.rs
index 5483368..3264e6c 100644
--- a/proxmox-nftables/src/statement.rs
+++ b/proxmox-nftables/src/statement.rs
@@ -10,6 +10,7 @@ use proxmox_ve_config::firewall::types::rule::Verdict as ConfigVerdict;
 #[cfg(feature = "config-ext")]
 use proxmox_ve_config::guest::types::Vmid;
 
+use crate::expression::Ct;
 use crate::expression::Meta;
 use crate::helper::{NfVec, Null};
 use crate::types::{RateTimescale, RateUnit, Verdict};
@@ -370,12 +371,19 @@ pub struct Mangle {
 }
 
 impl Mangle {
-    pub fn set_mark(value: impl Into<Expression>) -> Self {
+    pub fn meta_mark(value: impl Into<Expression>) -> Self {
         Self {
             key: Meta::new("mark").into(),
             value: value.into(),
         }
     }
+
+    pub fn ct_mark(value: impl Into<Expression>) -> Self {
+        Self {
+            key: Ct::new("mark", None).into(),
+            value: value.into(),
+        }
+    }
 }
 
 #[derive(Clone, Copy, Debug, Deserialize, Serialize)]
-- 
2.49.0



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