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Pull request 2256: 4923 Better interfaces

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Updates #4923.

Squashed commit of the following:

commit 0e40b41aa1e517a62d6076c4e7a57c607792ef01
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Jul 10 15:28:16 2024 +0300

    dhcpsvc: imp code, docs

commit 5463fdde473f84caaca229b53027e8183d5c6bdc
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Jul 9 20:31:20 2024 +0300

    dhcpsvc: imp ifaces
This commit is contained in:
Eugene Burkov
2024-07-10 16:17:56 +03:00
parent c0a33ce708
commit 42c7cd6f8e
8 changed files with 138 additions and 107 deletions
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40
internal/dhcpsvc/v6.go
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@@ -62,10 +62,12 @@ func (c *IPv6Config) validate() (err error) {
return errors.Join(errs...)
}
// netInterfaceV6 is a DHCP interface for IPv6 address family.
//
// TODO(e.burkov): Add options.
type netInterfaceV6 struct {
// dhcpInterfaceV6 is a DHCP interface for IPv6 address family.
type dhcpInterfaceV6 struct {
// common is the common part of any network interface within the DHCP
// server.
common *netInterface
// rangeStart is the first IP address in the range.
rangeStart netip.Addr
@@ -78,10 +80,6 @@ type netInterfaceV6 struct {
// intersections with implicitOpts.
explicitOpts layers.DHCPv6Options
// netInterface is embedded here to provide some common network interface
// logic.
netInterface
// raSLAACOnly defines if DHCP should send ICMPv6.RA packets without MO
// flags.
raSLAACOnly bool
@@ -90,16 +88,16 @@ type netInterfaceV6 struct {
raAllowSLAAC bool
}
// newNetInterfaceV6 creates a new DHCP interface for IPv6 address family with
// newDHCPInterfaceV6 creates a new DHCP interface for IPv6 address family with
// the given configuration.
//
// TODO(e.burkov): Validate properly.
func newNetInterfaceV6(
func newDHCPInterfaceV6(
ctx context.Context,
l *slog.Logger,
name string,
conf *IPv6Config,
) (i *netInterfaceV6) {
) (i *dhcpInterfaceV6) {
l = l.With(keyInterface, name, keyFamily, netutil.AddrFamilyIPv6)
if !conf.Enabled {
l.DebugContext(ctx, "disabled")
@@ -107,13 +105,9 @@ func newNetInterfaceV6(
return nil
}
i = &netInterfaceV6{
rangeStart: conf.RangeStart,
netInterface: netInterface{
name: name,
leaseTTL: conf.LeaseDuration,
logger: l,
},
i = &dhcpInterfaceV6{
rangeStart: conf.RangeStart,
common: newNetInterface(name, l, conf.LeaseDuration),
raSLAACOnly: conf.RASLAACOnly,
raAllowSLAAC: conf.RAAllowSLAAC,
}
@@ -122,12 +116,12 @@ func newNetInterfaceV6(
return i
}
// netInterfacesV4 is a slice of network interfaces of IPv4 address family.
type netInterfacesV6 []*netInterfaceV6
// dhcpInterfacesV6 is a slice of network interfaces of IPv6 address family.
type dhcpInterfacesV6 []*dhcpInterfaceV6
// find returns the first network interface within ifaces containing ip. It
// returns false if there is no such interface.
func (ifaces netInterfacesV6) find(ip netip.Addr) (iface6 *netInterface, ok bool) {
func (ifaces dhcpInterfacesV6) find(ip netip.Addr) (iface6 *netInterface, ok bool) {
// prefLen is the length of prefix to match ip against.
//
// TODO(e.burkov): DHCPv6 inherits the weird behavior of legacy
@@ -136,7 +130,7 @@ func (ifaces netInterfacesV6) find(ip netip.Addr) (iface6 *netInterface, ok bool
// be used instead.
const prefLen = netutil.IPv6BitLen - 8
i := slices.IndexFunc(ifaces, func(iface *netInterfaceV6) (contains bool) {
i := slices.IndexFunc(ifaces, func(iface *dhcpInterfaceV6) (contains bool) {
return !ip.Less(iface.rangeStart) &&
netip.PrefixFrom(iface.rangeStart, prefLen).Contains(ip)
})
@@ -144,7 +138,7 @@ func (ifaces netInterfacesV6) find(ip netip.Addr) (iface6 *netInterface, ok bool
return nil, false
}
return &ifaces[i].netInterface, true
return ifaces[i].common, true
}
// options returns the implicit and explicit options for the interface. The two