diff options
Diffstat (limited to 'dhcpv6/option_4rd.go')
| -rw-r--r-- | dhcpv6/option_4rd.go | 53 |
1 files changed, 47 insertions, 6 deletions
diff --git a/dhcpv6/option_4rd.go b/dhcpv6/option_4rd.go index 34e1fb9..3b074f4 100644 --- a/dhcpv6/option_4rd.go +++ b/dhcpv6/option_4rd.go @@ -9,7 +9,7 @@ import ( // Opt4RD represents a 4RD option. It is only a container for 4RD_*_RULE options type Opt4RD struct { - Options + FourRDOptions } // Code returns the Option Code for this option @@ -38,16 +38,56 @@ func (op *Opt4RD) FromBytes(data []byte) error { return op.Options.FromBytes(data) } -// Opt4RDMapRule represents a 4RD Mapping Rule option -// The option is described in https://tools.ietf.org/html/rfc7600#section-4.9 -// The 4RD mapping rules are described in https://tools.ietf.org/html/rfc7600#section-4.2 +// FourRDOptions are options that can be encapsulated with the 4RD option. +type FourRDOptions struct { + Options +} + +// MapRules returns the map rules associated with the 4RD option. +// +// "The OPTION_4RD DHCPv6 option contains at least one encapsulated +// OPTION_4RD_MAP_RULE option." (RFC 7600 Section 4.9) +func (frdo FourRDOptions) MapRules() []*Opt4RDMapRule { + opts := frdo.Options.Get(Option4RDMapRule) + var mrs []*Opt4RDMapRule + for _, o := range opts { + if m, ok := o.(*Opt4RDMapRule); ok { + mrs = append(mrs, m) + } + } + return mrs +} + +// NonMapRule returns the non-map-rule associated with this option. +// +// "The OPTION_4RD DHCPv6 option contains ... a maximum of one +// encapsulated OPTION_4RD_NON_MAP_RULE option." (RFC 7600 Section 4.9) +func (frdo FourRDOptions) NonMapRule() *Opt4RDNonMapRule { + opt := frdo.Options.GetOne(Option4RDNonMapRule) + if opt == nil { + return nil + } + nmr, ok := opt.(*Opt4RDNonMapRule) + if !ok { + return nil + } + return nmr +} + +// Opt4RDMapRule represents a 4RD Mapping Rule option. +// +// The option is described in RFC 7600 Section 4.9. The 4RD mapping rules are +// described in RFC 7600 Section 4.2. type Opt4RDMapRule struct { // Prefix4 is the IPv4 prefix mapped by this rule Prefix4 net.IPNet + // Prefix6 is the IPv6 prefix mapped by this rule Prefix6 net.IPNet + // EABitsLength is the number of bits of an address used in constructing the mapped address EABitsLength uint8 + // WKPAuthorized determines if well-known ports are assigned to addresses in an A+P mapping // It can only be set if the length of Prefix4 + EABits > 32 WKPAuthorized bool @@ -120,8 +160,10 @@ func (op *Opt4RDMapRule) FromBytes(data []byte) error { type Opt4RDNonMapRule struct { // HubAndSpoke is whether the network topology is hub-and-spoke or meshed HubAndSpoke bool + // TrafficClass is an optional 8-bit tunnel traffic class identifier TrafficClass *uint8 + // DomainPMTU is the Path MTU for this 4RD domain DomainPMTU uint16 } @@ -158,8 +200,7 @@ func (op *Opt4RDNonMapRule) String() string { tClass = *op.TrafficClass } - return fmt.Sprintf("%s: {HubAndSpoke=%t, TrafficClass=%v, DomainPMTU=%d}", - op.Code(), op.HubAndSpoke, tClass, op.DomainPMTU) + return fmt.Sprintf("%s: {HubAndSpoke=%t, TrafficClass=%v, DomainPMTU=%d}", op.Code(), op.HubAndSpoke, tClass, op.DomainPMTU) } // FromBytes builds an Opt4RDNonMapRule structure from a sequence of bytes. |