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fix(routing): change firewall only for matching ip families

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This commit is contained in:
Quentin McGaw
2023-09-20 10:45:13 +00:00
parent 6aa4a93665
commit 4ea474b896
2 changed files with 47 additions and 0 deletions
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16
internal/firewall/enable.go
View File

@@ -3,6 +3,8 @@ package firewall
import (
"context"
"fmt"
"github.com/qdm12/gluetun/internal/netlink"
)
func (c *Config) SetEnabled(ctx context.Context, enabled bool) (err error) {
@@ -147,7 +149,16 @@ func (c *Config) allowVPNIP(ctx context.Context) (err error) {
func (c *Config) allowOutboundSubnets(ctx context.Context) (err error) {
for _, subnet := range c.outboundSubnets {
subnetIsIPv6 := subnet.Addr().Is6()
firewallUpdated := false
for _, defaultRoute := range c.defaultRoutes {
defaultRouteIsIPv6 := defaultRoute.Family == netlink.FamilyV6
ipFamilyMatch := subnetIsIPv6 == defaultRouteIsIPv6
if !ipFamilyMatch {
continue
}
firewallUpdated = true
const remove = false
err := c.acceptOutputFromIPToSubnet(ctx, defaultRoute.NetInterface,
defaultRoute.AssignedIP, subnet, remove)
@@ -155,6 +166,11 @@ func (c *Config) allowOutboundSubnets(ctx context.Context) (err error) {
return err
}
}
if !firewallUpdated {
c.logger.Info(fmt.Sprintf("ignoring subnet %s which has "+
"no default route matching its family", subnet))
}
}
return nil
}

31
internal/firewall/outboundsubnets.go
View File

@@ -5,6 +5,7 @@ import (
"fmt"
"net/netip"
"github.com/qdm12/gluetun/internal/netlink"
"github.com/qdm12/gluetun/internal/subnet"
)
@@ -37,7 +38,16 @@ func (c *Config) SetOutboundSubnets(ctx context.Context, subnets []netip.Prefix)
func (c *Config) removeOutboundSubnets(ctx context.Context, subnets []netip.Prefix) {
const remove = true
for _, subNet := range subnets {
subnetIsIPv6 := subNet.Addr().Is6()
firewallUpdated := false
for _, defaultRoute := range c.defaultRoutes {
defaultRouteIsIPv6 := defaultRoute.Family == netlink.FamilyV6
ipFamilyMatch := subnetIsIPv6 == defaultRouteIsIPv6
if !ipFamilyMatch {
continue
}
firewallUpdated = true
err := c.acceptOutputFromIPToSubnet(ctx, defaultRoute.NetInterface,
defaultRoute.AssignedIP, subNet, remove)
if err != nil {
@@ -45,6 +55,12 @@ func (c *Config) removeOutboundSubnets(ctx context.Context, subnets []netip.Pref
continue
}
}
if !firewallUpdated {
c.logger.Info(fmt.Sprintf("ignoring subnet %s which has "+
"no default route matching its family", subNet))
continue
}
c.outboundSubnets = subnet.RemoveSubnetFromSubnets(c.outboundSubnets, subNet)
}
}
@@ -52,13 +68,28 @@ func (c *Config) removeOutboundSubnets(ctx context.Context, subnets []netip.Pref
func (c *Config) addOutboundSubnets(ctx context.Context, subnets []netip.Prefix) error {
const remove = false
for _, subnet := range subnets {
subnetIsIPv6 := subnet.Addr().Is6()
firewallUpdated := false
for _, defaultRoute := range c.defaultRoutes {
defaultRouteIsIPv6 := defaultRoute.Family == netlink.FamilyV6
ipFamilyMatch := subnetIsIPv6 == defaultRouteIsIPv6
if !ipFamilyMatch {
continue
}
firewallUpdated = true
err := c.acceptOutputFromIPToSubnet(ctx, defaultRoute.NetInterface,
defaultRoute.AssignedIP, subnet, remove)
if err != nil {
return err
}
}
if !firewallUpdated {
c.logger.Info(fmt.Sprintf("ignoring subnet %s which has "+
"no default route matching its family", subnet))
continue
}
c.outboundSubnets = append(c.outboundSubnets, subnet)
}
return nil