mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-09 16:20:26 +00:00
move ICMP PacketTooBig sending into core
This commit is contained in:
parent
8621223a1f
commit
3393db8e77
@ -231,6 +231,18 @@ func (c *Core) MaxMTU() uint64 {
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return c.store.maxSessionMTU()
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}
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// SetMTU can only safely be called after Init and before Start.
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func (c *Core) SetMTU(mtu uint64) {
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if mtu < 1280 {
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mtu = 1280
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}
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c.store.mtu = mtu
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}
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func (c *Core) MTU() uint64 {
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return c.store.mtu
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}
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// Implement io.ReadWriteCloser
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func (c *Core) Read(p []byte) (n int, err error) {
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@ -7,6 +7,9 @@ import (
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"sync"
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"time"
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"golang.org/x/net/icmp"
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"golang.org/x/net/ipv6"
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iwt "github.com/Arceliar/ironwood/types"
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"github.com/yggdrasil-network/yggdrasil-go/src/address"
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@ -26,6 +29,7 @@ type keyStore struct {
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addrBuffer map[address.Address]*buffer
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subnetToInfo map[address.Subnet]*keyInfo
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subnetBuffer map[address.Subnet]*buffer
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mtu uint64
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}
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type keyInfo struct {
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@ -53,6 +57,7 @@ func (k *keyStore) init(core *Core) {
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k.addrBuffer = make(map[address.Address]*buffer)
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k.subnetToInfo = make(map[address.Subnet]*keyInfo)
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k.subnetBuffer = make(map[address.Subnet]*buffer)
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k.mtu = 1280 // Default to something safe, expect user to set this
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}
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func (k *keyStore) sendToAddress(addr address.Address, bs []byte) {
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@ -238,18 +243,19 @@ func (k *keyStore) readPC(p []byte) (int, error) {
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if len(bs) < 40 {
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continue
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}
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/* TODO? ICMP packet too big, for now tuntap sends this when needed
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if len(bs) > int(tun.MTU()) {
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ptb := &icmp.PacketTooBig{
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MTU: int(tun.mtu),
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Data: bs[:40],
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}
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if packet, err := CreateICMPv6(bs[8:24], bs[24:40], ipv6.ICMPTypePacketTooBig, 0, ptb); err == nil {
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_, _ = tun.core.WriteTo(packet, from)
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}
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continue
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}
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*/
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if len(bs) > int(k.mtu) {
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// Using bs would make it leak off the stack, so copy to buf
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buf := make([]byte, 40)
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copy(buf, bs)
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ptb := &icmp.PacketTooBig{
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MTU: int(k.mtu),
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Data: buf[:40],
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}
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if packet, err := CreateICMPv6(buf[8:24], buf[24:40], ipv6.ICMPTypePacketTooBig, 0, ptb); err == nil {
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_, _ = k.writePC(packet)
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}
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continue
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}
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var srcAddr, dstAddr address.Address
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var srcSubnet, dstSubnet address.Subnet
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copy(srcAddr[:], bs[8:])
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@ -1,80 +0,0 @@
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package tuntap
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// The ICMPv6 module implements functions to easily create ICMPv6
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// packets. These functions, when mixed with the built-in Go IPv6
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// and ICMP libraries, can be used to send control messages back
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// to the host. Examples include:
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// - NDP messages, when running in TAP mode
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// - Packet Too Big messages, when packets exceed the session MTU
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// - Destination Unreachable messages, when a session prohibits
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// incoming traffic
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import (
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"encoding/binary"
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"net"
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"golang.org/x/net/icmp"
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"golang.org/x/net/ipv6"
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)
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type ICMPv6 struct{}
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// Marshal returns the binary encoding of h.
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func ipv6Header_Marshal(h *ipv6.Header) ([]byte, error) {
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b := make([]byte, 40)
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b[0] |= byte(h.Version) << 4
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b[0] |= byte(h.TrafficClass) >> 4
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b[1] |= byte(h.TrafficClass) << 4
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b[1] |= byte(h.FlowLabel >> 16)
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b[2] = byte(h.FlowLabel >> 8)
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b[3] = byte(h.FlowLabel)
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binary.BigEndian.PutUint16(b[4:6], uint16(h.PayloadLen))
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b[6] = byte(h.NextHeader)
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b[7] = byte(h.HopLimit)
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copy(b[8:24], h.Src)
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copy(b[24:40], h.Dst)
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return b, nil
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}
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// Creates an ICMPv6 packet based on the given icmp.MessageBody and other
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// parameters, complete with IP headers only, which can be written directly to
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// a TUN adapter, or called directly by the CreateICMPv6L2 function when
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// generating a message for TAP adapters.
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func CreateICMPv6(dst net.IP, src net.IP, mtype ipv6.ICMPType, mcode int, mbody icmp.MessageBody) ([]byte, error) {
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// Create the ICMPv6 message
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icmpMessage := icmp.Message{
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Type: mtype,
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Code: mcode,
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Body: mbody,
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}
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// Convert the ICMPv6 message into []byte
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icmpMessageBuf, err := icmpMessage.Marshal(icmp.IPv6PseudoHeader(src, dst))
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if err != nil {
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return nil, err
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}
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// Create the IPv6 header
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ipv6Header := ipv6.Header{
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Version: ipv6.Version,
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NextHeader: 58,
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PayloadLen: len(icmpMessageBuf),
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HopLimit: 255,
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Src: src,
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Dst: dst,
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}
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// Convert the IPv6 header into []byte
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ipv6HeaderBuf, err := ipv6Header_Marshal(&ipv6Header)
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if err != nil {
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return nil, err
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}
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// Construct the packet
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responsePacket := make([]byte, ipv6.HeaderLen+ipv6Header.PayloadLen)
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copy(responsePacket[:ipv6.HeaderLen], ipv6HeaderBuf)
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copy(responsePacket[ipv6.HeaderLen:], icmpMessageBuf)
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// Send it back
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return responsePacket, nil
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}
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@ -1,10 +1,5 @@
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package tuntap
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import (
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"golang.org/x/net/icmp"
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"golang.org/x/net/ipv6"
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)
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const TUN_OFFSET_BYTES = 4
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func (tun *TunAdapter) read() {
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@ -37,15 +32,8 @@ func (tun *TunAdapter) write() {
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tun.log.Errorln("Exiting tun writer due to core read error:", err)
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return
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}
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if n > int(tun.MTU()) {
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ptb := &icmp.PacketTooBig{
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MTU: int(tun.mtu),
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Data: bs[:40],
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}
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if packet, err := CreateICMPv6(bs[8:24], bs[24:40], ipv6.ICMPTypePacketTooBig, 0, ptb); err == nil {
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_, _ = tun.core.Write(packet)
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}
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continue
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if !tun.isEnabled {
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continue // Nothing to do, the tun isn't enabled
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}
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bs = buf[:TUN_OFFSET_BYTES+n]
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if _, err = tun.iface.Write(bs, TUN_OFFSET_BYTES); err != nil {
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@ -139,6 +139,7 @@ func (tun *TunAdapter) _start() error {
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if tun.MTU() != mtu {
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tun.log.Warnf("Warning: Interface MTU %d automatically adjusted to %d (supported range is 1280-%d)", tun.config.IfMTU, tun.MTU(), MaximumMTU())
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}
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tun.core.SetMTU(tun.MTU())
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tun.isOpen = true
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tun.isEnabled = true
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go tun.read()
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