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Return ICMPv6 Destination Unreachable for unknown destinations (#748)

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* Return ICMPv6 Destination Unreachable for unknown destinations

* Update go.mod/go.sum for yggdrasil-extras

* go mod tidy
This commit is contained in:
Neil Alexander 2020-12-06 19:47:25 +00:00 committed by GitHub
parent cb3d8647de
commit b9f35c5530
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 0 deletions
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13
src/tuntap/iface.go
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@ -5,6 +5,9 @@ import (
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
"golang.org/x/net/icmp"
"golang.org/x/net/ipv6"
"github.com/Arceliar/phony"
)
@ -147,6 +150,16 @@ func (tun *TunAdapter) _handlePacket(recvd []byte, err error) {
}
if addrlen != 16 || (!dstAddr.IsValid() && !dstSnet.IsValid()) {
// Couldn't find this node's ygg IP
dlen := len(bs)
if dlen > 900 {
dlen = 900
}
ptb := &icmp.DstUnreach{
Data: bs[:dlen],
}
if packet, err := CreateICMPv6(bs[8:24], bs[24:40], ipv6.ICMPTypeDestinationUnreachable, 0, ptb); err == nil {
tun.writer.writeFrom(nil, packet)
}
return
}
// Do we have an active connection for this node address?