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use super::firewall::Firewall;
use super::network_interface::NetworkInterface;
use crate::util::sudo_command;
use anyhow::Context;
use log::debug;
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct HostMasquerade {
ip_mask: String,
interface: NetworkInterface,
firewall: Firewall,
}
impl HostMasquerade {
/// Add masquerade rule to route traffic from network namespace to active network interface
pub fn add_masquerade_rule(
ip_mask: String,
interface: NetworkInterface,
firewall: Firewall,
) -> anyhow::Result<Self> {
match firewall {
Firewall::IpTables => {
sudo_command(&[
"iptables",
"-t",
"nat",
"-A",
"POSTROUTING",
"-s",
&ip_mask,
"-o",
&interface.name,
"-j",
"MASQUERADE",
])
.with_context(|| {
format!(
"Failed to add iptables masquerade rule, ip_mask: {}, interface: {}",
&ip_mask, &interface.name
)
})?;
}
Firewall::NfTables => {
sudo_command(&["nft", "add", "table", "inet", "vopono_nat"])
.context("Failed to create nft table vopono_nat")?;
sudo_command(&["nft", "add chain inet vopono_nat postrouting { type nat hook postrouting priority 100 ; }"])
.context("Failed to create nft postrouting chain in vopono_nat")?;
sudo_command(&[
"nft",
"add",
"rule",
"inet",
"vopono_nat",
"postrouting",
"oifname",
&interface.name,
"ip",
"saddr",
&ip_mask,
"counter",
"masquerade",
])
.with_context(|| {
format!(
"Failed to add nftables masquerade rule, ip_mask: {}, interface: {}",
&ip_mask, &interface.name
)
})?;
}
}
Ok(HostMasquerade {
ip_mask,
interface,
firewall,
})
}
}
impl Drop for HostMasquerade {
fn drop(&mut self) {
// Only drop these settings if there are no other active namespaces
let namespaces = crate::util::get_lock_namespaces();
debug!("Remaining namespaces: {:?}", namespaces);
if namespaces.is_ok() && namespaces.unwrap().is_empty() {
match self.firewall {
Firewall::IpTables => {
sudo_command(&[
"iptables",
"-t",
"nat",
"-D",
"POSTROUTING",
"-s",
&self.ip_mask,
"-o",
&self.interface.name,
"-j",
"MASQUERADE",
])
.unwrap_or_else(|_| {
panic!(
"Failed to delete iptables masquerade rule, ip_mask: {}, interface: {}",
&self.ip_mask, &self.interface.name
)
});
}
Firewall::NfTables => {
sudo_command(&["nft", "delete", "table", "inet", "vopono_nat"]).unwrap_or_else(
|_| {
panic!(
"Failed to delete nftables masquerade rule, ip_mask: {}, interface: {}",
&self.ip_mask, &self.interface.name
)
},
);
}
}
}
}
}
#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct FirewallException {
host_interface: NetworkInterface,
ns_interface: NetworkInterface,
firewall: Firewall,
}
impl FirewallException {
/// Add firewall exception for network namespace to host and vice versa (in case of ufw
/// running)
pub fn add_firewall_exception(
ns_interface: NetworkInterface,
host_interface: NetworkInterface,
firewall: Firewall,
) -> anyhow::Result<Self> {
match firewall {
Firewall::IpTables => {
sudo_command(&[
"iptables",
"-I",
"FORWARD",
"-i",
&host_interface.name,
"-o",
&ns_interface.name,
"-j",
"ACCEPT",
])
.with_context(|| {
format!(
"Failed to add iptables host input exception, host interface: {}, namespace interface: {}",
&host_interface.name, &ns_interface.name
)
})?;
sudo_command(&[
"iptables",
"-I",
"FORWARD",
"-o",
&host_interface.name,
"-i",
&ns_interface.name,
"-j",
"ACCEPT",
])
.with_context(|| {
format!(
"Failed to add iptables host output exception, host interface: {}, namespace interface: {}",
&host_interface.name, &ns_interface.name
)
})?;
}
Firewall::NfTables => {
sudo_command(&["nft", "add", "table", "inet", "vopono_bridge"])
.context("Failed to create nft table vopono_bridge")?;
sudo_command(&[
"nft",
"add chain inet vopono_bridge forward { type filter hook forward priority -10 ; }",
])
.context("Failed to create nft forward chain in vopono_bridge")?;
sudo_command(&[
"nft",
"add",
"rule",
"inet",
"vopono_bridge",
"forward",
"iifname",
&host_interface.name,
"oifname",
&ns_interface.name,
"counter",
"accept",
])
.with_context(|| {
format!(
"Failed to add nftables bridge input accept rule, host_interface: {}, namespace interface: {}",
&host_interface.name, &ns_interface.name
)
})?;
sudo_command(&[
"nft",
"add",
"rule",
"inet",
"vopono_bridge",
"forward",
"oifname",
&host_interface.name,
"iifname",
&ns_interface.name,
"counter",
"accept",
])
.with_context(|| {
format!(
"Failed to add nftables bridge output accept rule, host_interface: {}, namespace interface: {}",
&host_interface.name, &ns_interface.name
)
})?;
}
}
Ok(FirewallException {
host_interface,
ns_interface,
firewall,
})
}
}
impl Drop for FirewallException {
fn drop(&mut self) {
// Only drop these settings if there are no other active namespaces
let namespaces = crate::util::get_lock_namespaces();
debug!("Remaining namespaces: {:?}", namespaces);
if namespaces.is_ok() && namespaces.unwrap().is_empty() {
match self.firewall {
Firewall::IpTables => {
sudo_command(&[
"iptables",
"-D",
"FORWARD",
"-o",
&self.host_interface.name,
"-i",
&self.ns_interface.name,
"-j",
"ACCEPT",
])
.unwrap_or_else(|_| {
panic!(
"Failed to delete iptables host output rule, host interface: {}, namespace interface: {}",
&self.host_interface.name, &self.ns_interface.name
)
});
sudo_command(&[
"iptables",
"-D",
"FORWARD",
"-i",
&self.host_interface.name,
"-o",
&self.ns_interface.name,
"-j",
"ACCEPT",
])
.unwrap_or_else(|_| {
panic!(
"Failed to delete iptables host input rule, host interface: {}, namespace interface: {}",
&self.host_interface.name, &self.ns_interface.name
)
});
}
Firewall::NfTables => {
sudo_command(&["nft", "delete", "table", "inet", "vopono_bridge"]).unwrap_or_else(
|_| {
panic!(
"Failed to delete nftables namespace bridge firewall rule, host interface: {}, namespace interface: {}",
&self.host_interface.name, &self.ns_interface.name
)
},
);
}
}
}
}
}