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Replace the eBPF WireGuard proxy with loopback endpoint addressing

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This commit is contained in:
Viktor Liu
2026-08-25 12:27:47 +02:00
parent 7f03a2e86f
commit 2a3b0cec08
23 changed files with 958 additions and 536 deletions
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27
client/firewall/iptables/manager_linux.go
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@@ -524,30 +524,33 @@ const (
tableRaw = "raw"
)
// SetupEBPFProxyNoTrack creates notrack rules for eBPF proxy loopback traffic.
// SetupWGProxyNoTrack creates notrack rules for WireGuard proxy loopback traffic.
// This prevents conntrack from tracking WireGuard proxy traffic on loopback, which
// can interfere with MASQUERADE rules (e.g., from container runtimes like Podman/netavark).
//
// Every relayed peer has its own loopback endpoint address, so the rules match the
// whole 127.0.0.0/8 range.
//
// Traffic flows that need NOTRACK:
//
// 1. Egress: WireGuard -> fake endpoint (before eBPF rewrite)
// src=127.0.0.1:wgPort -> dst=127.0.0.1:fakePort
// 1. Egress: WireGuard -> peer endpoint
// src=127.0.0.1:wgPort -> dst=127.x.x.x:proxyPort
// Matched by: sport=wgPort
//
// 2. Egress: Proxy -> WireGuard (via raw socket)
// src=127.0.0.1:fakePort -> dst=127.0.0.1:wgPort
// src=127.x.x.x:proxyPort -> dst=127.0.0.1:wgPort
// Matched by: dport=wgPort
//
// 3. Ingress: Packets to WireGuard
// dst=127.0.0.1:wgPort
// Matched by: dport=wgPort
//
// 4. Ingress: Packets to proxy (after eBPF rewrite)
// dst=127.0.0.1:proxyPort
// 4. Ingress: Packets to the proxy
// dst=127.x.x.x:proxyPort
// Matched by: dport=proxyPort
//
// Rules are cleaned up when the firewall manager is closed.
func (m *Manager) SetupEBPFProxyNoTrack(proxyPort, wgPort uint16) error {
func (m *Manager) SetupWGProxyNoTrack(proxyPort, wgPort uint16) error {
m.mutex.Lock()
defer m.mutex.Unlock()
@@ -559,28 +562,28 @@ func (m *Manager) SetupEBPFProxyNoTrack(proxyPort, wgPort uint16) error {
proxyPortStr := fmt.Sprintf("%d", proxyPort)
// Egress rules: match outgoing loopback UDP packets
outputRuleSport := []string{"-o", "lo", "-s", "127.0.0.1", "-d", "127.0.0.1", "-p", "udp", "--sport", wgPortStr, "-j", "NOTRACK"}
outputRuleSport := []string{"-o", "lo", "-s", "127.0.0.0/8", "-d", "127.0.0.0/8", "-p", "udp", "--sport", wgPortStr, "-j", "NOTRACK"}
if err := m.ipv4Client.AppendUnique(tableRaw, chainNameRaw, outputRuleSport...); err != nil {
return fmt.Errorf("add output sport notrack rule: %w", err)
}
outputRuleDport := []string{"-o", "lo", "-s", "127.0.0.1", "-d", "127.0.0.1", "-p", "udp", "--dport", wgPortStr, "-j", "NOTRACK"}
outputRuleDport := []string{"-o", "lo", "-s", "127.0.0.0/8", "-d", "127.0.0.0/8", "-p", "udp", "--dport", wgPortStr, "-j", "NOTRACK"}
if err := m.ipv4Client.AppendUnique(tableRaw, chainNameRaw, outputRuleDport...); err != nil {
return fmt.Errorf("add output dport notrack rule: %w", err)
}
// Ingress rules: match incoming loopback UDP packets
preroutingRuleWg := []string{"-i", "lo", "-s", "127.0.0.1", "-d", "127.0.0.1", "-p", "udp", "--dport", wgPortStr, "-j", "NOTRACK"}
preroutingRuleWg := []string{"-i", "lo", "-s", "127.0.0.0/8", "-d", "127.0.0.0/8", "-p", "udp", "--dport", wgPortStr, "-j", "NOTRACK"}
if err := m.ipv4Client.AppendUnique(tableRaw, chainNameRaw, preroutingRuleWg...); err != nil {
return fmt.Errorf("add prerouting wg notrack rule: %w", err)
}
preroutingRuleProxy := []string{"-i", "lo", "-s", "127.0.0.1", "-d", "127.0.0.1", "-p", "udp", "--dport", proxyPortStr, "-j", "NOTRACK"}
preroutingRuleProxy := []string{"-i", "lo", "-s", "127.0.0.0/8", "-d", "127.0.0.0/8", "-p", "udp", "--dport", proxyPortStr, "-j", "NOTRACK"}
if err := m.ipv4Client.AppendUnique(tableRaw, chainNameRaw, preroutingRuleProxy...); err != nil {
return fmt.Errorf("add prerouting proxy notrack rule: %w", err)
}
log.Debugf("set up ebpf proxy notrack rules for ports %d,%d", proxyPort, wgPort)
log.Debugf("set up wg proxy notrack rules for ports %d,%d", proxyPort, wgPort)
return nil
}