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Pull request 2245: 4923 gopacket DHCP vol.8

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Updates #4923.

Squashed commit of the following:

commit 0bfccf8bc1e63c4f5a01ce7f268e767969b368a0
Merge: 305f9fe2f 0e5e8e4dd
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Jul 3 15:12:43 2024 +0300

    Merge branch 'master' into 4923-gopacket-dhcp-vol.8

commit 305f9fe2fec033f28385dfe2bbee6a27a83b9702
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Jul 2 17:03:01 2024 +0300

    dhcpsvc: adjust interface

commit f05b9f42e2f50325ddaf09b5fed84b62e48c5120
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Jul 2 16:59:39 2024 +0300

    dhcpsvc: use logger

commit 4779f945baf9c8722d07d589928a86290a37d3ab
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Jul 2 14:59:22 2024 +0300

    dhcpsvc: add todo

commit ae1713e5f717a66863eb0289e3aa66c7069ac8bf
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Jul 1 15:49:22 2024 +0300

    dhcpsvc: use slog
This commit is contained in:
Eugene Burkov
2024-07-03 15:29:54 +03:00
parent 0e5e8e4dde
commit beeb8f0522
9 changed files with 368 additions and 212 deletions
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95
internal/dhcpsvc/v6.go
View File

@@ -1,12 +1,14 @@
package dhcpsvc
import (
"context"
"fmt"
"log/slog"
"net/netip"
"slices"
"time"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/netutil"
"github.com/google/gopacket/layers"
)
@@ -38,50 +40,26 @@ type IPv6Config struct {
}
// validate returns an error in conf if any.
func (conf *IPv6Config) validate() (err error) {
switch {
case conf == nil:
func (c *IPv6Config) validate() (err error) {
if c == nil {
return errNilConfig
case !conf.Enabled:
return nil
case !conf.RangeStart.Is6():
return fmt.Errorf("range start %s should be a valid ipv6", conf.RangeStart)
case conf.LeaseDuration <= 0:
return fmt.Errorf("lease duration %s must be positive", conf.LeaseDuration)
default:
} else if !c.Enabled {
return nil
}
}
// options returns the implicit and explicit options for the interface. The two
// lists are disjoint and the implicit options are initialized with default
// values.
//
// TODO(e.burkov): Add implicit options according to RFC.
func (conf *IPv6Config) options() (implicit, explicit layers.DHCPv6Options) {
// Set default values of host configuration parameters listed in RFC 8415.
implicit = layers.DHCPv6Options{}
slices.SortFunc(implicit, compareV6OptionCodes)
var errs []error
// Set values for explicitly configured options.
for _, exp := range conf.Options {
i, found := slices.BinarySearchFunc(implicit, exp, compareV6OptionCodes)
if found {
implicit = slices.Delete(implicit, i, i+1)
}
explicit = append(explicit, exp)
if !c.RangeStart.Is6() {
err = fmt.Errorf("range start %s should be a valid ipv6", c.RangeStart)
errs = append(errs, err)
}
log.Debug("dhcpsvc: v6: implicit options: %s", implicit)
log.Debug("dhcpsvc: v6: explicit options: %s", explicit)
if c.LeaseDuration <= 0 {
err = fmt.Errorf("lease duration %s must be positive", c.LeaseDuration)
errs = append(errs, err)
}
return implicit, explicit
}
// compareV6OptionCodes compares option codes of a and b.
func compareV6OptionCodes(a, b layers.DHCPv6Option) (res int) {
return int(a.Code) - int(b.Code)
return errors.Join(errs...)
}
// netInterfaceV6 is a DHCP interface for IPv6 address family.
@@ -116,8 +94,16 @@ type netInterfaceV6 struct {
// the given configuration.
//
// TODO(e.burkov): Validate properly.
func newNetInterfaceV6(name string, conf *IPv6Config) (i *netInterfaceV6) {
func newNetInterfaceV6(
ctx context.Context,
l *slog.Logger,
name string,
conf *IPv6Config,
) (i *netInterfaceV6) {
l = l.With(keyInterface, name, keyFamily, netutil.AddrFamilyIPv6)
if !conf.Enabled {
l.DebugContext(ctx, "disabled")
return nil
}
@@ -126,11 +112,12 @@ func newNetInterfaceV6(name string, conf *IPv6Config) (i *netInterfaceV6) {
netInterface: netInterface{
name: name,
leaseTTL: conf.LeaseDuration,
logger: l,
},
raSLAACOnly: conf.RASLAACOnly,
raAllowSLAAC: conf.RAAllowSLAAC,
}
i.implicitOpts, i.explicitOpts = conf.options()
i.implicitOpts, i.explicitOpts = conf.options(ctx, l)
return i
}
@@ -159,3 +146,33 @@ func (ifaces netInterfacesV6) find(ip netip.Addr) (iface6 *netInterface, ok bool
return &ifaces[i].netInterface, true
}
// options returns the implicit and explicit options for the interface. The two
// lists are disjoint and the implicit options are initialized with default
// values.
//
// TODO(e.burkov): Add implicit options according to RFC.
func (c *IPv6Config) options(ctx context.Context, l *slog.Logger) (imp, exp layers.DHCPv6Options) {
// Set default values of host configuration parameters listed in RFC 8415.
imp = layers.DHCPv6Options{}
slices.SortFunc(imp, compareV6OptionCodes)
// Set values for explicitly configured options.
for _, e := range c.Options {
i, found := slices.BinarySearchFunc(imp, e, compareV6OptionCodes)
if found {
imp = slices.Delete(imp, i, i+1)
}
exp = append(exp, e)
}
l.DebugContext(ctx, "options", "implicit", imp, "explicit", exp)
return imp, exp
}
// compareV6OptionCodes compares option codes of a and b.
func compareV6OptionCodes(a, b layers.DHCPv6Option) (res int) {
return int(a.Code) - int(b.Code)
}