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Allow proto restriction

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This commit is contained in:
Owen
2025-12-15 18:02:17 -05:00
parent 0637360b31
commit 004bb9b12d
2 changed files with 26 additions and 10 deletions
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34
netstack2/proxy.go
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@@ -22,10 +22,12 @@ import (
"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
)
// PortRange represents an allowed range of ports (inclusive)
// PortRange represents an allowed range of ports (inclusive) with optional protocol filtering
// Protocol can be "tcp", "udp", or "" (empty string means both protocols)
type PortRange struct {
Min uint16
Max uint16
Min uint16
Max uint16
Protocol string // "tcp", "udp", or "" for both
}
// SubnetRule represents a subnet with optional port restrictions and source address
@@ -97,14 +99,16 @@ func (sl *SubnetLookup) RemoveSubnet(sourcePrefix, destPrefix netip.Prefix) {
delete(sl.rules, key)
}
// Match checks if a source IP, destination IP, and port match any subnet rule
// Returns the matched rule if BOTH:
// Match checks if a source IP, destination IP, port, and protocol match any subnet rule
// Returns the matched rule if ALL of these conditions are met:
// - The source IP is in the rule's source prefix
// - The destination IP is in the rule's destination prefix
// - The port is in an allowed range (or no port restrictions exist)
// - The protocol matches (or the port range allows both protocols)
//
// proto should be header.TCPProtocolNumber or header.UDPProtocolNumber
// Returns nil if no rule matches
func (sl *SubnetLookup) Match(srcIP, dstIP netip.Addr, port uint16) *SubnetRule {
func (sl *SubnetLookup) Match(srcIP, dstIP netip.Addr, port uint16, proto tcpip.TransportProtocolNumber) *SubnetRule {
sl.mu.RLock()
defer sl.mu.RUnlock()
@@ -125,10 +129,20 @@ func (sl *SubnetLookup) Match(srcIP, dstIP netip.Addr, port uint16) *SubnetRule
return rule
}
// Check if port is in any of the allowed ranges
// Check if port and protocol are in any of the allowed ranges
for _, pr := range rule.PortRanges {
if port >= pr.Min && port <= pr.Max {
return rule
// Check protocol compatibility
if pr.Protocol == "" {
// Empty protocol means allow both TCP and UDP
return rule
}
// Check if the packet protocol matches the port range protocol
if (pr.Protocol == "tcp" && proto == header.TCPProtocolNumber) ||
(pr.Protocol == "udp" && proto == header.UDPProtocolNumber) {
return rule
}
// Port matches but protocol doesn't - continue checking other ranges
}
}
}
@@ -412,8 +426,8 @@ func (p *ProxyHandler) HandleIncomingPacket(packet []byte) bool {
dstPort = 0
}
// Check if the source IP, destination IP, and port match any subnet rule
matchedRule := p.subnetLookup.Match(srcAddr, dstAddr, dstPort)
// Check if the source IP, destination IP, port, and protocol match any subnet rule
matchedRule := p.subnetLookup.Match(srcAddr, dstAddr, dstPort, protocol)
if matchedRule != nil {
// Check if we need to perform DNAT
if matchedRule.RewriteTo != "" {