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Fix redirect routes

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世界 2026-07-14 10:20:18 +08:00
parent 7954dd6e20
commit 9c6760589d
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GPG key ID: CD109927C34A63C4
1 changed files with 29 additions and 13 deletions
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38
redirect_route_linux.go
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@ -5,7 +5,6 @@ package tun
import (
"math/rand"
"net"
"net/netip"
"github.com/sagernet/netlink"
"github.com/sagernet/sing/common"
@ -69,9 +68,8 @@ func (r *autoRedirect) setupRedirectRoutes() error {
}
func (r *autoRedirect) addRedirectRoutes(iface control.Interface) error {
if r.enableIPv4 && common.Any(iface.Addresses, func(it netip.Prefix) bool {
return it.Addr().Is4()
}) {
hasIPv4Address, hasIPv6Address := redirectRouteAddressFamilies(iface)
if r.enableIPv4 && hasIPv4Address {
err := netlink.RouteAppend(&netlink.Route{
LinkIndex: iface.Index,
Dst: &net.IPNet{IP: net.IPv4(127, 0, 0, 1), Mask: net.CIDRMask(32, 32)},
@ -83,9 +81,7 @@ func (r *autoRedirect) addRedirectRoutes(iface control.Interface) error {
return E.Cause(err, "append ipv4 loopback route")
}
}
if r.enableIPv6 && common.Any(iface.Addresses, func(it netip.Prefix) bool {
return it.Addr().Is6() && !it.Addr().Is4In6()
}) {
if r.enableIPv6 && hasIPv6Address {
err := netlink.RouteAppend(&netlink.Route{
LinkIndex: iface.Index,
Dst: &net.IPNet{IP: net.IPv6loopback, Mask: net.CIDRMask(128, 128)},
@ -100,6 +96,18 @@ func (r *autoRedirect) addRedirectRoutes(iface control.Interface) error {
return nil
}
func redirectRouteAddressFamilies(iface control.Interface) (hasIPv4Address bool, hasIPv6Address bool) {
for _, prefix := range iface.Addresses {
address := prefix.Addr()
if address.Is4() {
hasIPv4Address = true
} else if address.Is6() && !address.Is4In6() {
hasIPv6Address = true
}
}
return
}
func (r *autoRedirect) removeRedirectRoutes(linkIndex int) {
if r.enableIPv4 {
_ = netlink.RouteDel(&netlink.Route{
@ -128,22 +136,30 @@ func (r *autoRedirect) updateRedirectRoutes() error {
newInterfaces := common.Filter(r.interfaceFinder.Interfaces(), func(it control.Interface) bool {
return it.Name != "lo" && it.Name != tunName && it.Flags&net.FlagUp != 0
})
oldMap := make(map[int]bool, len(r.redirectInterfaces))
oldMap := make(map[int]control.Interface, len(r.redirectInterfaces))
for _, iface := range r.redirectInterfaces {
oldMap[iface.Index] = true
oldMap[iface.Index] = iface
}
newMap := make(map[int]bool, len(newInterfaces))
for _, iface := range newInterfaces {
newMap[iface.Index] = true
}
for _, iface := range newInterfaces {
if !oldMap[iface.Index] {
oldInterface, loaded := oldMap[iface.Index]
if loaded {
oldHasIPv4Address, oldHasIPv6Address := redirectRouteAddressFamilies(oldInterface)
hasIPv4Address, hasIPv6Address := redirectRouteAddressFamilies(iface)
if (!r.enableIPv4 || oldHasIPv4Address == hasIPv4Address) &&
(!r.enableIPv6 || oldHasIPv6Address == hasIPv6Address) {
continue
}
r.removeRedirectRoutes(iface.Index)
}
err = r.addRedirectRoutes(iface)
if err != nil {
return E.Cause(err, "add redirect routes for ", iface.Name)
}
}
}
for _, iface := range r.redirectInterfaces {
if !newMap[iface.Index] {
r.removeRedirectRoutes(iface.Index)