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Fix TAP support

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This commit is contained in:
Neil Alexander 2019-04-23 11:37:32 +01:00
parent b4513ca2e8
commit 2b44f5d2f6
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GPG Key ID: A02A2019A2BB0944
2 changed files with 12 additions and 10 deletions
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3
src/tuntap/icmpv6.go
View File

@ -169,7 +169,6 @@ func (i *ICMPv6) UnmarshalPacket(datain []byte, datamac *[]byte) ([]byte, error)
if err != nil { if err != nil {
return nil, err return nil, err
} }
// Send it back // Send it back
return responsePacket, nil return responsePacket, nil
} else { } else {
@ -186,7 +185,7 @@ func (i *ICMPv6) UnmarshalPacket(datain []byte, datamac *[]byte) ([]byte, error)
copy(addr[:], ipv6Header.Src[:]) copy(addr[:], ipv6Header.Src[:])
copy(target[:], datain[48:64]) copy(target[:], datain[48:64])
copy(mac[:], (*datamac)[:]) copy(mac[:], (*datamac)[:])
// i.tun.core.log.Printf("Learning peer MAC %x for %x\n", mac, target) // fmt.Printf("Learning peer MAC %x for %x\n", mac, target)
neighbor := i.peermacs[target] neighbor := i.peermacs[target]
neighbor.mac = mac neighbor.mac = mac
neighbor.learned = true neighbor.learned = true

17
src/tuntap/tun.go
View File

@ -114,7 +114,6 @@ func (tun *TunAdapter) Init(config *config.NodeState, log *log.Logger, listener
tun.dialer = dialer tun.dialer = dialer
tun.addrToConn = make(map[address.Address]*yggdrasil.Conn) tun.addrToConn = make(map[address.Address]*yggdrasil.Conn)
tun.subnetToConn = make(map[address.Subnet]*yggdrasil.Conn) tun.subnetToConn = make(map[address.Subnet]*yggdrasil.Conn)
tun.icmpv6.Init(tun)
} }
// Start the setup process for the TUN/TAP adapter. If successful, starts the // Start the setup process for the TUN/TAP adapter. If successful, starts the
@ -175,6 +174,7 @@ func (tun *TunAdapter) Start() error {
}() }()
go tun.handler() go tun.handler()
go tun.ifaceReader() go tun.ifaceReader()
tun.icmpv6.Init(tun)
return nil return nil
} }
@ -328,17 +328,20 @@ func (tun *TunAdapter) ifaceReader() error {
} }
// If it's a TAP adapter, update the buffer slice so that we no longer // If it's a TAP adapter, update the buffer slice so that we no longer
// include the ethernet headers // include the ethernet headers
offset := 0
if tun.iface.IsTAP() { if tun.iface.IsTAP() {
bs = bs[tun_ETHER_HEADER_LENGTH:] // Set our offset to beyond the ethernet headers
} offset = tun_ETHER_HEADER_LENGTH
// If we detect an ICMP packet then hand it to the ICMPv6 module // If we detect an ICMP packet then hand it to the ICMPv6 module
if bs[6] == 58 { if bs[offset+6] == 58 {
if tun.iface.IsTAP() {
// Found an ICMPv6 packet // Found an ICMPv6 packet
b := make([]byte, n) b := make([]byte, n)
copy(b, bs) copy(b, bs)
go tun.icmpv6.ParsePacket(b) go tun.icmpv6.ParsePacket(b)
} }
// Then offset the buffer so that we can now just treat it as an IP
// packet from now on
bs = bs[offset:]
} }
// From the IP header, work out what our source and destination addresses // From the IP header, work out what our source and destination addresses
// and node IDs are. We will need these in order to work out where to send // and node IDs are. We will need these in order to work out where to send
@ -357,7 +360,7 @@ func (tun *TunAdapter) ifaceReader() error {
continue continue
} }
// Check the packet size // Check the packet size
if n != 256*int(bs[4])+int(bs[5])+tun_IPv6_HEADER_LENGTH { if n != 256*int(bs[4])+int(bs[5])+offset+tun_IPv6_HEADER_LENGTH {
continue continue
} }
// IPv6 address // IPv6 address
@ -371,7 +374,7 @@ func (tun *TunAdapter) ifaceReader() error {
continue continue
} }
// Check the packet size // Check the packet size
if bs[0]&0xf0 == 0x40 && n != 256*int(bs[2])+int(bs[3]) { if n != 256*int(bs[2])+int(bs[3])+offset {
continue continue
} }
// IPv4 address // IPv4 address