cwinfo/yggdrasil-go
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Modify ICMPv6 source address for "Packet Too Big" messages to a routable address so that it correctly routes to nodes in an yggdrasil /64 subnet

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This commit is contained in:
Neil Alexander 2018-03-10 22:31:36 +00:00
parent 0dc1dd6292
commit bf0413a0c4
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GPG Key ID: A02A2019A2BB0944
2 changed files with 11 additions and 7 deletions
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14
src/yggdrasil/icmpv6.go
View File

@ -130,7 +130,9 @@ func (i *icmpv6) parse_packet_tun(datain []byte) ([]byte, error) {
response, err := i.handle_ndp(datain[ipv6.HeaderLen:]) response, err := i.handle_ndp(datain[ipv6.HeaderLen:])
if err == nil { if err == nil {
// Create our ICMPv6 response // Create our ICMPv6 response
responsePacket, err := i.create_icmpv6_tun(ipv6Header.Src, ipv6.ICMPTypeNeighborAdvertisement, 0, responsePacket, err := i.create_icmpv6_tun(
ipv6Header.Src, i.mylladdr,
ipv6.ICMPTypeNeighborAdvertisement, 0,
&icmp.DefaultMessageBody{Data: response}) &icmp.DefaultMessageBody{Data: response})
if err != nil { if err != nil {
return nil, err return nil, err
@ -147,9 +149,9 @@ func (i *icmpv6) parse_packet_tun(datain []byte) ([]byte, error) {
return nil, errors.New("ICMPv6 type not matched") return nil, errors.New("ICMPv6 type not matched")
} }
func (i *icmpv6) create_icmpv6_tap(dstmac macAddress, dst net.IP, mtype ipv6.ICMPType, mcode int, mbody icmp.MessageBody) ([]byte, error) { func (i *icmpv6) create_icmpv6_tap(dstmac macAddress, dst net.IP, src net.IP, mtype ipv6.ICMPType, mcode int, mbody icmp.MessageBody) ([]byte, error) {
// Pass through to create_icmpv6_tun // Pass through to create_icmpv6_tun
ipv6packet, err := i.create_icmpv6_tun(dst, mtype, mcode, mbody) ipv6packet, err := i.create_icmpv6_tun(dst, src, mtype, mcode, mbody)
if err != nil { if err != nil {
return nil, err return nil, err
} }
@ -167,7 +169,7 @@ func (i *icmpv6) create_icmpv6_tap(dstmac macAddress, dst net.IP, mtype ipv6.ICM
return dataout, nil return dataout, nil
} }
func (i *icmpv6) create_icmpv6_tun(dst net.IP, mtype ipv6.ICMPType, mcode int, mbody icmp.MessageBody) ([]byte, error) { func (i *icmpv6) create_icmpv6_tun(dst net.IP, src net.IP, mtype ipv6.ICMPType, mcode int, mbody icmp.MessageBody) ([]byte, error) {
// Create the ICMPv6 message // Create the ICMPv6 message
icmpMessage := icmp.Message{ icmpMessage := icmp.Message{
Type: mtype, Type: mtype,
@ -176,7 +178,7 @@ func (i *icmpv6) create_icmpv6_tun(dst net.IP, mtype ipv6.ICMPType, mcode int, m
} }
// Convert the ICMPv6 message into []byte // Convert the ICMPv6 message into []byte
icmpMessageBuf, err := icmpMessage.Marshal(icmp.IPv6PseudoHeader(i.mylladdr, dst)) icmpMessageBuf, err := icmpMessage.Marshal(icmp.IPv6PseudoHeader(src, dst))
if err != nil { if err != nil {
return nil, err return nil, err
} }
@ -187,7 +189,7 @@ func (i *icmpv6) create_icmpv6_tun(dst net.IP, mtype ipv6.ICMPType, mcode int, m
NextHeader: 58, NextHeader: 58,
PayloadLen: len(icmpMessageBuf), PayloadLen: len(icmpMessageBuf),
HopLimit: 255, HopLimit: 255,
Src: i.mylladdr, Src: src,
Dst: dst, Dst: dst,
} }

4
src/yggdrasil/router.go
View File

@ -163,7 +163,9 @@ func (r *router) sendPacket(bs []byte) {
} }
// Create the ICMPv6 response from it // Create the ICMPv6 response from it
icmpv6Buf, err := r.core.tun.icmpv6.create_icmpv6_tun(bs[8:24], ipv6.ICMPTypePacketTooBig, 0, ptb) icmpv6Buf, err := r.core.tun.icmpv6.create_icmpv6_tun(
bs[8:24], bs[24:40],
ipv6.ICMPTypePacketTooBig, 0, ptb)
if err == nil { if err == nil {
r.recv <- icmpv6Buf r.recv <- icmpv6Buf
} }