yggdrasil-network/yggdrasil-go
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More complete NDP implementation for TAP mode, which tracks individual MAC addresses for neighbors

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This commit is contained in:
Neil Alexander 2018-11-10 15:46:10 +00:00
parent 7af85c7d70
commit d50e1bc803
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GPG key ID: A02A2019A2BB0944
2 changed files with 120 additions and 41 deletions
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46
src/yggdrasil/tun.go
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@ -3,6 +3,7 @@ package yggdrasil
// This manages the tun driver to send/recv packets to/from applications
import (
"errors"
"yggdrasil/defaults"
"github.com/songgao/packets/ethernet"
@ -61,17 +62,42 @@ func (tun *tunDevice) write() error {
continue
}
if tun.iface.IsTAP() {
var frame ethernet.Frame
frame.Prepare(
tun.icmpv6.peermac[:6], // Destination MAC address
tun.icmpv6.mymac[:6], // Source MAC address
ethernet.NotTagged, // VLAN tagging
ethernet.IPv6, // Ethertype
len(data)) // Payload length
copy(frame[tun_ETHER_HEADER_LENGTH:], data[:])
if _, err := tun.iface.Write(frame); err != nil {
panic(err)
var destAddr address
if data[0]&0xf0 == 0x60 {
if len(data) < 40 {
panic("Tried to send a packet shorter than an IPv6 header...")
}
copy(destAddr[:16], data[24:])
} else if data[0]&0xf0 == 0x40 {
if len(data) < 20 {
panic("Tried to send a packet shorter than an IPv4 header...")
}
copy(destAddr[:4], data[16:])
} else {
return errors.New("Invalid address family")
}
if peermac, ok := tun.icmpv6.peermacs[destAddr]; ok {
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
len(data)) // Payload length
copy(frame[tun_ETHER_HEADER_LENGTH:], data[:])
if _, err := tun.iface.Write(frame); err != nil {
panic(err)
}
} else {
request, err := tun.icmpv6.create_ndp_tap(data)
if err != nil {
panic(err)
}
if _, err := tun.iface.Write(request); err != nil {
panic(err)
}
}
} else {
if _, err := tun.iface.Write(data); err != nil {
panic(err)