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Export ipv6 address helpers

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This is useful for Fuchsia.

PiperOrigin-RevId: 214619681
Change-Id: If5a60dd82365c2eae51a12bbc819e5aae8c76ee9
This commit is contained in:
Tamir Duberstein
2018-09-26 09:49:52 -07:00
committed by Shentubot
parent d489336784
commit bee264f0c5
3 changed files with 37 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files
pkg/tcpip/header/ipv6.go
+32
View File
@@ -202,3 +202,35 @@ func IsV6MulticastAddress(addr tcpip.Address) bool {
}
return addr[0] == 0xff
}
// SolicitedNodeAddr computes the solicited-node multicast address. This is
// used for NDP. Described in RFC 4291. The argument must be a full-length IPv6
// address.
func SolicitedNodeAddr(addr tcpip.Address) tcpip.Address {
const solicitedNodeMulticastPrefix = "\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\xff"
return solicitedNodeMulticastPrefix + addr[len(addr)-3:]
}
// LinkLocalAddr computes the default IPv6 link-local address from a link-layer
// (MAC) address.
func LinkLocalAddr(linkAddr tcpip.LinkAddress) tcpip.Address {
// Convert a 48-bit MAC to an EUI-64 and then prepend the link-local
// header, FE80::.
//
// The conversion is very nearly:
// aa:bb:cc:dd:ee:ff => FE80::Aabb:ccFF:FEdd:eeff
// Note the capital A. The conversion aa->Aa involves a bit flip.
lladdrb := [16]byte{
0: 0xFE,
1: 0x80,
8: linkAddr[0] ^ 2,
9: linkAddr[1],
10: linkAddr[2],
11: 0xFF,
12: 0xFE,
13: linkAddr[3],
14: linkAddr[4],
15: linkAddr[5],
}
return tcpip.Address(lladdrb[:])
}
pkg/tcpip/network/ipv6/icmp.go
+1 -8
View File
@@ -153,13 +153,6 @@ const (
icmpV6LengthOffset = 25
)
// solicitedNodeAddr computes the solicited-node multicast address.
// This is used for NDP. Described in RFC 4291.
func solicitedNodeAddr(addr tcpip.Address) tcpip.Address {
const solicitedNodeMulticastPrefix = "\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\xff"
return solicitedNodeMulticastPrefix + addr[len(addr)-3:]
}
var broadcastMAC = tcpip.LinkAddress([]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff})
var _ stack.LinkAddressResolver = (*protocol)(nil)
@@ -171,7 +164,7 @@ func (*protocol) LinkAddressProtocol() tcpip.NetworkProtocolNumber {
// LinkAddressRequest implements stack.LinkAddressResolver.
func (*protocol) LinkAddressRequest(addr, localAddr tcpip.Address, linkEP stack.LinkEndpoint) *tcpip.Error {
snaddr := solicitedNodeAddr(addr)
snaddr := header.SolicitedNodeAddr(addr)
r := &stack.Route{
LocalAddress: localAddr,
RemoteAddress: snaddr,
pkg/tcpip/network/ipv6/icmp_test.go
+4 -28
View File
@@ -36,33 +36,9 @@ const (
linkAddr1 = tcpip.LinkAddress("\x0a\x0b\x0c\x0d\x0e\x0f")
)
// linkLocalAddr computes the default IPv6 link-local address from
// a link-layer (MAC) address.
func linkLocalAddr(linkAddr tcpip.LinkAddress) tcpip.Address {
// Convert a 48-bit MAC to an EUI-64 and then prepend the
// link-local header, FE80::.
//
// The conversion is very nearly:
// aa:bb:cc:dd:ee:ff => FE80::Aabb:ccFF:FEdd:eeff
// Note the capital A. The conversion aa->Aa involves a bit flip.
lladdrb := [16]byte{
0: 0xFE,
1: 0x80,
8: linkAddr[0] ^ 2,
9: linkAddr[1],
10: linkAddr[2],
11: 0xFF,
12: 0xFE,
13: linkAddr[3],
14: linkAddr[4],
15: linkAddr[5],
}
return tcpip.Address(lladdrb[:])
}
var (
lladdr0 = linkLocalAddr(linkAddr0)
lladdr1 = linkLocalAddr(linkAddr1)
lladdr0 = header.LinkLocalAddr(linkAddr0)
lladdr1 = header.LinkLocalAddr(linkAddr1)
)
type testContext struct {
@@ -106,7 +82,7 @@ func newTestContext(t *testing.T) *testContext {
if err := c.s0.AddAddress(1, ProtocolNumber, lladdr0); err != nil {
t.Fatalf("AddAddress lladdr0: %v", err)
}
if err := c.s0.AddAddress(1, ProtocolNumber, solicitedNodeAddr(lladdr0)); err != nil {
if err := c.s0.AddAddress(1, ProtocolNumber, header.SolicitedNodeAddr(lladdr0)); err != nil {
t.Fatalf("AddAddress sn lladdr0: %v", err)
}
@@ -120,7 +96,7 @@ func newTestContext(t *testing.T) *testContext {
if err := c.s1.AddAddress(1, ProtocolNumber, lladdr1); err != nil {
t.Fatalf("AddAddress lladdr1: %v", err)
}
if err := c.s1.AddAddress(1, ProtocolNumber, solicitedNodeAddr(lladdr1)); err != nil {
if err := c.s1.AddAddress(1, ProtocolNumber, header.SolicitedNodeAddr(lladdr1)); err != nil {
t.Fatalf("AddAddress sn lladdr1: %v", err)
}