ToNftObjects is basically a conversion trait that converts firewall
config structs into nftables objects. It returns a list of commands
that create the respective nftables objects.
Reviewed-by: Lukas Wagner <l.wag...@proxmox.com>
Reviewed-by: Max Carrara <m.carr...@proxmox.com>
Co-authored-by: Wolfgang Bumiller <w.bumil...@proxmox.com>
Signed-off-by: Stefan Hanreich <s.hanre...@proxmox.com>
---
proxmox-firewall/src/main.rs | 1 +
proxmox-firewall/src/object.rs | 140 +++++++++++++++++++++++++++++++++
2 files changed, 141 insertions(+)
create mode 100644 proxmox-firewall/src/object.rs
diff --git a/proxmox-firewall/src/main.rs b/proxmox-firewall/src/main.rs
index ae832e3..a4979a7 100644
--- a/proxmox-firewall/src/main.rs
+++ b/proxmox-firewall/src/main.rs
@@ -1,6 +1,7 @@
use anyhow::Error;
mod config;
+mod object;
mod rule;
fn main() -> Result<(), Error> {
diff --git a/proxmox-firewall/src/object.rs b/proxmox-firewall/src/object.rs
new file mode 100644
index 0000000..32c4ddb
--- /dev/null
+++ b/proxmox-firewall/src/object.rs
@@ -0,0 +1,140 @@
+use anyhow::{format_err, Error};
+use proxmox_nftables::{
+ command::{Add, Flush},
+ expression::Prefix,
+ types::{
+ AddCtHelper, AddElement, CtHelperProtocol, ElementType, L3Protocol,
SetConfig, SetFlag,
+ SetName, TablePart,
+ },
+ Command, Expression,
+};
+use proxmox_ve_config::{
+ firewall::{
+ ct_helper::CtHelperMacro,
+ types::{address::Family, alias::AliasName, ipset::IpsetAddress, Alias,
Ipset},
+ },
+ guest::types::Vmid,
+};
+
+use crate::config::FirewallConfig;
+
+pub(crate) struct NftObjectEnv<'a, 'b> {
+ pub(crate) table: &'a TablePart,
+ pub(crate) firewall_config: &'b FirewallConfig,
+ pub(crate) vmid: Option<Vmid>,
+}
+
+impl NftObjectEnv<'_, '_> {
+ pub(crate) fn alias(&self, name: &AliasName) -> Option<&Alias> {
+ self.firewall_config.alias(name, self.vmid)
+ }
+}
+
+pub(crate) trait ToNftObjects {
+ fn to_nft_objects(&self, env: &NftObjectEnv) -> Result<Vec<Command>,
Error>;
+}
+
+impl ToNftObjects for CtHelperMacro {
+ fn to_nft_objects(&self, env: &NftObjectEnv) -> Result<Vec<Command>,
Error> {
+ let mut commands = Vec::new();
+
+ if let Some(_protocol) = self.tcp() {
+ commands.push(Add::ct_helper(AddCtHelper {
+ table: env.table.clone(),
+ name: self.tcp_helper_name(),
+ ty: self.name().to_string(),
+ protocol: CtHelperProtocol::TCP,
+ l3proto: self.family().map(L3Protocol::from),
+ }));
+ }
+
+ if let Some(_protocol) = self.udp() {
+ commands.push(Add::ct_helper(AddCtHelper {
+ table: env.table.clone(),
+ name: self.udp_helper_name(),
+ ty: self.name().to_string(),
+ protocol: CtHelperProtocol::UDP,
+ l3proto: self.family().map(L3Protocol::from),
+ }));
+ }
+
+ Ok(commands)
+ }
+}
+
+impl ToNftObjects for Ipset {
+ fn to_nft_objects(&self, env: &NftObjectEnv) -> Result<Vec<Command>,
Error> {
+ let mut commands = Vec::new();
+ log::trace!("generating objects for ipset: {self:?}");
+
+ for family in env.table.family().families() {
+ let mut elements = Vec::new();
+ let mut nomatch_elements = Vec::new();
+
+ for element in self.iter() {
+ let cidr = match &element.address {
+ IpsetAddress::Cidr(cidr) => cidr,
+ IpsetAddress::Alias(alias) => env
+ .alias(alias)
+ .ok_or(format_err!("could not find alias {alias} in
environment"))?
+ .address(),
+ };
+
+ if family != cidr.family() {
+ continue;
+ }
+
+ let expression = Expression::from(Prefix::from(cidr));
+
+ if element.nomatch {
+ nomatch_elements.push(expression);
+ } else {
+ elements.push(expression);
+ }
+ }
+
+ let element_type = match family {
+ Family::V4 => ElementType::Ipv4Addr,
+ Family::V6 => ElementType::Ipv6Addr,
+ };
+
+ let set_name = SetName::new(
+ env.table.clone(),
+ SetName::ipset_name(family, self.name(), env.vmid, false),
+ );
+
+ let set_config =
+ SetConfig::new(set_name.clone(),
vec![element_type]).with_flag(SetFlag::Interval);
+
+ let nomatch_name = SetName::new(
+ env.table.clone(),
+ SetName::ipset_name(family, self.name(), env.vmid, true),
+ );
+
+ let nomatch_config = SetConfig::new(nomatch_name.clone(),
vec![element_type])
+ .with_flag(SetFlag::Interval);
+
+ commands.append(&mut vec![
+ Add::set(set_config),
+ Flush::set(set_name.clone()),
+ Add::set(nomatch_config),
+ Flush::set(nomatch_name.clone()),
+ ]);
+
+ if !elements.is_empty() {
+ commands.push(Add::element(AddElement::set_from_expressions(
+ set_name, elements,
+ )));
+ }
+
+ if !nomatch_elements.is_empty() {
+ commands.push(Add::element(AddElement::set_from_expressions(
+ nomatch_name,
+ nomatch_elements,
+ )));
+ }
+ }
+
+ Ok(commands)
+ }
+}
--
2.39.2
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