cwinfo/yggdrasil-go
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Fix CKR (IPv4/IPv6) in TAP mode so frames sent to node MAC, base MAC/LL from node IPv6 address

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This commit is contained in:
Neil Alexander 2018-11-10 18:33:52 +00:00
parent adc32fe92f
commit 6fab0e9507
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GPG Key ID: A02A2019A2BB0944
2 changed files with 18 additions and 3 deletions
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4
src/yggdrasil/icmpv6.go
View File

@ -67,8 +67,8 @@ func (i *icmpv6) init(t *tunDevice) {
i.mylladdr = net.IP{
0xFE, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xFE}
copy(i.mymac[1:], i.tun.core.boxPub[:])
copy(i.mylladdr[9:], i.tun.core.boxPub[:])
copy(i.mymac[:], i.tun.core.router.addr[:])
copy(i.mylladdr[9:], i.tun.core.router.addr[1:])
}
// Parses an incoming ICMPv6 packet. The packet provided may be either an

17
src/yggdrasil/tun.go
View File

@ -3,6 +3,7 @@ package yggdrasil
// This manages the tun driver to send/recv packets to/from applications
import (
"bytes"
"errors"
"time"
"yggdrasil/defaults"
@ -110,6 +111,13 @@ func (tun *tunDevice) write() error {
}
var peermac macAddress
var peerknown bool
if data[0]&0xf0 == 0x40 {
destAddr = tun.core.router.addr
} else if data[0]&0xf0 == 0x60 {
if !bytes.Equal(tun.core.router.addr[:16], destAddr[:16]) && !bytes.Equal(tun.core.router.subnet[:8], destAddr[:8]) {
destAddr = tun.core.router.addr
}
}
if neighbor, ok := tun.icmpv6.peermacs[destAddr]; ok && neighbor.learned {
peermac = neighbor.mac
peerknown = true
@ -121,12 +129,19 @@ func (tun *tunDevice) write() error {
sendndp(tun.core.router.addr)
}
if peerknown {
var proto ethernet.Ethertype
switch {
case data[0]&0xf0 == 0x60:
proto = ethernet.IPv6
case data[0]&0xf0 == 0x40:
proto = ethernet.IPv4
}
var frame ethernet.Frame
frame.Prepare(
peermac[:6], // Destination MAC address
tun.icmpv6.mymac[:6], // Source MAC address
ethernet.NotTagged, // VLAN tagging
ethernet.IPv6, // Ethertype
proto, // Ethertype
len(data)) // Payload length
copy(frame[tun_ETHER_HEADER_LENGTH:], data[:])
if _, err := tun.iface.Write(frame); err != nil {