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slayers: unmap IPv4-mapped IPv6 addresses #4377

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merged 3 commits into from
Oct 10, 2023
Merged

slayers: unmap IPv4-mapped IPv6 addresses #4377

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4069fad
slayers: unmap IPv4-mapped IPv6 addresses
oncilla Aug 16, 2023
7c8847d
simplify code
oncilla Aug 21, 2023
a4b9c76
Merge branch 'master' into slayers-unwrap
oncilla Oct 9, 2023
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9 changes: 5 additions & 4 deletions pkg/slayers/scion.go
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Original file line number Diff line number Diff line change
Expand Up @@ -394,15 +394,16 @@ func ParseAddr(addrType AddrType, raw []byte) (addr.Host, error) {
func PackAddr(host addr.Host) (AddrType, []byte, error) {
switch host.Type() {
case addr.HostTypeIP:
ip := host.IP()
// The IP is potentially IPv4-in-IPv6. We need to unmap it to ensure
// we only have true IPv4 or IPv6 addresses.
ip := host.IP().Unmap()
if !ip.IsValid() {
break
}
t := T4Ip
if ip.Is6() {
t = T16Ip
return T16Ip, ip.AsSlice(), nil
}
return t, ip.AsSlice(), nil
return T4Ip, ip.AsSlice(), nil
case addr.HostTypeSVC:
raw := make([]byte, 4)
binary.BigEndian.PutUint16(raw, uint16(host.SVC()))
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15 changes: 11 additions & 4 deletions pkg/slayers/scion_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -33,10 +33,11 @@ import (
)

var (
ip6Addr = addr.MustParseHost("2001:db8::68")
ip4Addr = addr.MustParseHost("10.0.0.100")
svcAddr = addr.MustParseHost("Wildcard")
rawPath = func() []byte {
ip6Addr = addr.MustParseHost("2001:db8::68")
ip4Addr = addr.MustParseHost("10.0.0.100")
ip4in6Addr = addr.MustParseHost("::ffff:10.0.0.100")
svcAddr = addr.MustParseHost("Wildcard")
rawPath = func() []byte {
return []byte("\x00\x00\x20\x80\x00\x00\x01\x11\x00\x00\x01\x00\x01\x00\x02\x22\x00" +
"\x00\x01\x00\x00\x3f\x00\x01\x00\x00\x01\x02\x03\x04\x05\x06\x00\x3f\x00\x03\x00" +
"\x02\x01\x02\x03\x04\x05\x06\x00\x3f\x00\x00\x00\x02\x01\x02\x03\x04\x05\x06\x00" +
Expand Down Expand Up @@ -311,6 +312,12 @@ func TestPackAddr(t *testing.T) {
rawAddr: ip4Addr.IP().AsSlice(),
errorFunc: assert.NoError,
},
"pack IPv4-mapped IPv6": {
addr: ip4in6Addr,
addrType: slayers.T4Ip,
rawAddr: []byte{0xa, 0x0, 0x0, 0x64},
errorFunc: assert.NoError,
},
"pack IPv6": {
addr: ip6Addr,
addrType: slayers.T16Ip,
Expand Down
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