diff options
Diffstat (limited to 'pkg/tcpip/header/ipv6.go')
| -rw-r--r-- | pkg/tcpip/header/ipv6.go | 87 |
1 files changed, 70 insertions, 17 deletions
diff --git a/pkg/tcpip/header/ipv6.go b/pkg/tcpip/header/ipv6.go index f2403978c..c3a0407ac 100644 --- a/pkg/tcpip/header/ipv6.go +++ b/pkg/tcpip/header/ipv6.go @@ -98,12 +98,27 @@ const ( // The address is ff02::1. IPv6AllNodesMulticastAddress tcpip.Address = "\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01" - // IPv6AllRoutersMulticastAddress is a link-local multicast group that - // all IPv6 routers MUST join, as per RFC 4291, section 2.8. Packets + // IPv6AllRoutersInterfaceLocalMulticastAddress is an interface-local + // multicast group that all IPv6 routers MUST join, as per RFC 4291, section + // 2.8. Packets destined to this address will reach the router on an + // interface. + // + // The address is ff01::2. + IPv6AllRoutersInterfaceLocalMulticastAddress tcpip.Address = "\xff\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02" + + // IPv6AllRoutersLinkLocalMulticastAddress is a link-local multicast group + // that all IPv6 routers MUST join, as per RFC 4291, section 2.8. Packets // destined to this address will reach all routers on a link. // // The address is ff02::2. - IPv6AllRoutersMulticastAddress tcpip.Address = "\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02" + IPv6AllRoutersLinkLocalMulticastAddress tcpip.Address = "\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02" + + // IPv6AllRoutersSiteLocalMulticastAddress is a site-local multicast group + // that all IPv6 routers MUST join, as per RFC 4291, section 2.8. Packets + // destined to this address will reach all routers in a site. + // + // The address is ff05::2. + IPv6AllRoutersSiteLocalMulticastAddress tcpip.Address = "\xff\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02" // IPv6MinimumMTU is the minimum MTU required by IPv6, per RFC 8200, // section 5: @@ -142,11 +157,6 @@ 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 @@ -381,25 +391,25 @@ func LinkLocalAddr(linkAddr tcpip.LinkAddress) tcpip.Address { return tcpip.Address(lladdrb[:]) } -// IsV6LinkLocalAddress determines if the provided address is an IPv6 -// link-local address (fe80::/10). -func IsV6LinkLocalAddress(addr tcpip.Address) bool { +// IsV6LinkLocalUnicastAddress returns true iff the provided address is an IPv6 +// link-local unicast address, as defined by RFC 4291 section 2.5.6. +func IsV6LinkLocalUnicastAddress(addr tcpip.Address) bool { if len(addr) != IPv6AddressSize { return false } return addr[0] == 0xfe && (addr[1]&0xc0) == 0x80 } -// IsV6LoopbackAddress determines if the provided address is an IPv6 loopback -// address. +// IsV6LoopbackAddress returns true iff the provided address is an IPv6 loopback +// address, as defined by RFC 4291 section 2.5.3. func IsV6LoopbackAddress(addr tcpip.Address) bool { return addr == IPv6Loopback } -// IsV6LinkLocalMulticastAddress determines if the provided address is an IPv6 -// link-local multicast address. +// IsV6LinkLocalMulticastAddress returns true iff the provided address is an +// IPv6 link-local multicast address, as defined by RFC 4291 section 2.7. 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 @@ -462,7 +472,7 @@ func ScopeForIPv6Address(addr tcpip.Address) (IPv6AddressScope, tcpip.Error) { case IsV6LinkLocalMulticastAddress(addr): return LinkLocalScope, nil - case IsV6LinkLocalAddress(addr): + case IsV6LinkLocalUnicastAddress(addr): return LinkLocalScope, nil default: @@ -520,3 +530,46 @@ func GenerateTempIPv6SLAACAddr(tempIIDHistory []byte, stableAddr tcpip.Address) PrefixLen: IIDOffsetInIPv6Address * 8, } } + +// IPv6MulticastScope is the scope of a multicast IPv6 address, as defined by +// RFC 7346 section 2. +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) +} |