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Diffstat (limited to 'pkg/tcpip/header/ipv6.go')
-rw-r--r--pkg/tcpip/header/ipv6.go49
1 files changed, 43 insertions, 6 deletions
diff --git a/pkg/tcpip/header/ipv6.go b/pkg/tcpip/header/ipv6.go
index f2403978c..7711abec1 100644
--- a/pkg/tcpip/header/ipv6.go
+++ b/pkg/tcpip/header/ipv6.go
@@ -142,11 +142,6 @@ const (
// ipv6MulticastAddressScopeMask is the mask for the scope (scop) field,
// within the byte holding the field, as per RFC 4291 section 2.7.
ipv6MulticastAddressScopeMask = 0xF
-
- // ipv6LinkLocalMulticastScope is the value of the scope (scop) field within
- // a multicast IPv6 address that indicates the address has link-local scope,
- // as per RFC 4291 section 2.7.
- ipv6LinkLocalMulticastScope = 2
)
// IPv6EmptySubnet is the empty IPv6 subnet. It may also be known as the
@@ -399,7 +394,7 @@ func IsV6LoopbackAddress(addr tcpip.Address) bool {
// IsV6LinkLocalMulticastAddress determines if the provided address is an IPv6
// link-local multicast address.
func IsV6LinkLocalMulticastAddress(addr tcpip.Address) bool {
- return IsV6MulticastAddress(addr) && addr[ipv6MulticastAddressScopeByteIdx]&ipv6MulticastAddressScopeMask == ipv6LinkLocalMulticastScope
+ return IsV6MulticastAddress(addr) && V6MulticastScope(addr) == IPv6LinkLocalMulticastScope
}
// AppendOpaqueInterfaceIdentifier appends a 64 bit opaque interface identifier
@@ -520,3 +515,45 @@ func GenerateTempIPv6SLAACAddr(tempIIDHistory []byte, stableAddr tcpip.Address)
PrefixLen: IIDOffsetInIPv6Address * 8,
}
}
+
+// IPv6MulticastScope is the scope of a multicast IPv6 address.
+type IPv6MulticastScope uint8
+
+// The various values for IPv6 multicast scopes, as per RFC 7346 section 2:
+//
+// +------+--------------------------+-------------------------+
+// | scop | NAME | REFERENCE |
+// +------+--------------------------+-------------------------+
+// | 0 | Reserved | [RFC4291], RFC 7346 |
+// | 1 | Interface-Local scope | [RFC4291], RFC 7346 |
+// | 2 | Link-Local scope | [RFC4291], RFC 7346 |
+// | 3 | Realm-Local scope | [RFC4291], RFC 7346 |
+// | 4 | Admin-Local scope | [RFC4291], RFC 7346 |
+// | 5 | Site-Local scope | [RFC4291], RFC 7346 |
+// | 6 | Unassigned | |
+// | 7 | Unassigned | |
+// | 8 | Organization-Local scope | [RFC4291], RFC 7346 |
+// | 9 | Unassigned | |
+// | A | Unassigned | |
+// | B | Unassigned | |
+// | C | Unassigned | |
+// | D | Unassigned | |
+// | E | Global scope | [RFC4291], RFC 7346 |
+// | F | Reserved | [RFC4291], RFC 7346 |
+// +------+--------------------------+-------------------------+
+const (
+ IPv6Reserved0MulticastScope = IPv6MulticastScope(0x0)
+ IPv6InterfaceLocalMulticastScope = IPv6MulticastScope(0x1)
+ IPv6LinkLocalMulticastScope = IPv6MulticastScope(0x2)
+ IPv6RealmLocalMulticastScope = IPv6MulticastScope(0x3)
+ IPv6AdminLocalMulticastScope = IPv6MulticastScope(0x4)
+ IPv6SiteLocalMulticastScope = IPv6MulticastScope(0x5)
+ IPv6OrganizationLocalMulticastScope = IPv6MulticastScope(0x8)
+ IPv6GlobalMulticastScope = IPv6MulticastScope(0xE)
+ IPv6ReservedFMulticastScope = IPv6MulticastScope(0xF)
+)
+
+// V6MulticastScope returns the scope of a multicast address.
+func V6MulticastScope(addr tcpip.Address) IPv6MulticastScope {
+ return IPv6MulticastScope(addr[ipv6MulticastAddressScopeByteIdx] & ipv6MulticastAddressScopeMask)
+}