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Fix TAP mode

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This commit is contained in:
Neil Alexander 2019-07-06 15:08:17 +01:00
parent 912c181581
commit e8272926a4
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GPG key ID: A02A2019A2BB0944
4 changed files with 88 additions and 53 deletions
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25
src/tuntap/iface.go
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@ -3,6 +3,7 @@ package tuntap
import (
"bytes"
"errors"
"net"
"time"
"github.com/songgao/packets/ethernet"
@ -43,19 +44,10 @@ func (tun *TunAdapter) writer() error {
neigh, known := tun.icmpv6.peermacs[dstAddr]
known = known && (time.Since(neigh.lastsolicitation).Seconds() < 30)
if !known {
request, err := tun.icmpv6.CreateNDPL2(dstAddr)
if err != nil {
panic(err)
}
if _, err := tun.iface.Write(request); err != nil {
panic(err)
}
tun.icmpv6.peermacs[dstAddr] = neighbor{
lastsolicitation: time.Now(),
}
tun.icmpv6.Solicit(dstAddr)
}
}
var peermac macAddress
peermac := net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
var peerknown bool
if b[0]&0xf0 == 0x40 {
dstAddr = tun.addr
@ -65,14 +57,19 @@ func (tun *TunAdapter) writer() error {
}
}
if neighbor, ok := tun.icmpv6.peermacs[dstAddr]; ok && neighbor.learned {
// If we've learned the MAC of a 300::/7 address, for example, or a CKR
// address, use the MAC address of that
peermac = neighbor.mac
peerknown = true
} else if neighbor, ok := tun.icmpv6.peermacs[tun.addr]; ok && neighbor.learned {
// Otherwise send directly to the MAC address of the host if that's
// known instead
peermac = neighbor.mac
peerknown = true
sendndp(dstAddr)
} else {
// Nothing has been discovered, try to discover the destination
sendndp(tun.addr)
}
if peerknown {
var proto ethernet.Ethertype
@ -92,6 +89,8 @@ func (tun *TunAdapter) writer() error {
copy(frame[tun_ETHER_HEADER_LENGTH:], b[:n])
n += tun_ETHER_HEADER_LENGTH
w, err = tun.iface.Write(frame[:n])
} else {
tun.log.Errorln("TUN/TAP iface write error: no peer MAC known for", net.IP(dstAddr[:]).String(), "- dropping packet")
}
} else {
w, err = tun.iface.Write(b[:n])
@ -184,7 +183,7 @@ func (tun *TunAdapter) reader() error {
// Unknown address length or protocol, so drop the packet and ignore it
continue
}
if !tun.ckr.isValidSource(srcAddr, addrlen) {
if tun.ckr.isEnabled() && !tun.ckr.isValidSource(srcAddr, addrlen) {
// The packet had a source address that doesn't belong to us or our
// configured crypto-key routing source subnets
continue