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Add support for IPv6 networks (on Linux clients) (#1459)

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* Feat add basic support for IPv6 networks

Newly generated networks automatically generate an IPv6 prefix of size
64 within the ULA address range, devices obtain a randomly generated
address within this prefix.

Currently, this is Linux only and does not yet support all features
(routes currently cause an error).

* Fix firewall configuration for IPv6 networks

* Fix routing configuration for IPv6 networks

* Feat provide info on IPv6 support for specific client to mgmt server

* Feat allow configuration of IPv6 support through API, improve stability

* Feat add IPv6 support to new firewall implementation

* Fix peer list item response not containing IPv6 address

* Fix nftables breaking on IPv6 address change

* Fix build issues for non-linux systems

* Fix intermittent disconnections when IPv6 is enabled

* Fix test issues and make some minor revisions

* Fix some more testing issues

* Fix more CI issues due to IPv6

* Fix more testing issues

* Add inheritance of IPv6 enablement status from groups

* Fix IPv6 events not having associated messages

* Address first review comments regarding IPv6 support

* Fix IPv6 table being created even when IPv6 is disabled

Also improved stability of IPv6 route and firewall handling on client side

* Fix IPv6 routes not being removed

* Fix DNS IPv6 issues, limit IPv6 nameservers to IPv6 peers

* Improve code for IPv6 DNS server selection, add AAAA custom records

* Ensure IPv6 routes can only exist for IPv6 routing peers

* Fix IPv6 network generation randomness

* Fix a bunch of compilation issues and test failures

* Replace method calls that are unavailable in Go 1.21

* Fix nil dereference in cleanUpDefaultForwardRules6

* Fix nil pointer dereference when persisting IPv6 network in sqlite

* Clean up of client-side code changes for IPv6

* Fix nil dereference in rule mangling and compilation issues

* Add a bunch of client-side test cases for IPv6

* Fix IPv6 tests running on unsupported environments

* Fix import cycle in tests

* Add missing method SupportsIPv6() for windows

* Require IPv6 default route for IPv6 tests

* Fix panics in routemanager tests on non-linux

* Fix some more route manager tests concerning IPv6

* Add some final client-side tests

* Add IPv6 tests for management code, small fixes

* Fix linting issues

* Fix small test suite issues

* Fix linter issues and builds on macOS and Windows again

* fix builds for iOS because of IPv6 breakage
This commit is contained in:
Hugo Hakim Damer
2024-08-13 17:26:27 +02:00
committed by GitHub
parent 4da29451d0
commit 8b0398c0db
85 changed files with 4311 additions and 795 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
client/internal/routemanager/systemops_linux.go
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@@ -184,12 +184,6 @@ func addVPNRoute(prefix netip.Prefix, intf *net.Interface) error {
// No need to check if routes exist as main table takes precedence over the VPN table via Rule 1
// TODO remove this once we have ipv6 support
if prefix == defaultv4 {
if err := addUnreachableRoute(defaultv6, NetbirdVPNTableID); err != nil {
return fmt.Errorf("add blackhole: %w", err)
}
}
if err := addRoute(prefix, netip.Addr{}, intf, NetbirdVPNTableID); err != nil {
return fmt.Errorf("add route: %w", err)
}
@@ -201,12 +195,6 @@ func removeVPNRoute(prefix netip.Prefix, intf *net.Interface) error {
return genericRemoveVPNRoute(prefix, intf)
}
// TODO remove this once we have ipv6 support
if prefix == defaultv4 {
if err := removeUnreachableRoute(defaultv6, NetbirdVPNTableID); err != nil {
return fmt.Errorf("remove unreachable route: %w", err)
}
}
if err := removeRoute(prefix, netip.Addr{}, intf, NetbirdVPNTableID); err != nil {
return fmt.Errorf("remove route: %w", err)
}
@@ -282,6 +270,9 @@ func addRoute(prefix netip.Prefix, addr netip.Addr, intf *net.Interface, tableID
// addUnreachableRoute adds an unreachable route for the specified IP family and routing table.
// ipFamily should be netlink.FAMILY_V4 for IPv4 or netlink.FAMILY_V6 for IPv6.
// tableID specifies the routing table to which the unreachable route will be added.
// TODO should this be kept in for future use? If so, the linter needs to be told that this unreachable function should
//
// be kept
func addUnreachableRoute(prefix netip.Prefix, tableID int) error {
_, ipNet, err := net.ParseCIDR(prefix.String())
if err != nil {
@@ -302,6 +293,9 @@ func addUnreachableRoute(prefix netip.Prefix, tableID int) error {
return nil
}
// TODO should this be kept in for future use? If so, the linter needs to be told that this unreachable function should
//
// be kept
func removeUnreachableRoute(prefix netip.Prefix, tableID int) error {
_, ipNet, err := net.ParseCIDR(prefix.String())
if err != nil {
@@ -376,8 +370,14 @@ func flushRoutes(tableID, family int) error {
return result.ErrorOrNil()
}
func enableIPForwarding() error {
func enableIPForwarding(includeV6 bool) error {
_, err := setSysctl(ipv4ForwardingPath, 1, false)
if err != nil {
return err
}
if includeV6 {
_, err = setSysctl(ipv4ForwardingPath, 1, false)
}
return err
}