mirror of
https://github.com/cwinfo/yggdrasil-go.git
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Remove commented out router function
This commit is contained in:
Neil Alexander
parent
de1005e4fa
commit
377f88512b
@ -138,181 +138,6 @@ func (r *router) mainLoop() {
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}
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}
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}
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}
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/*
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// Checks a packet's to/from address to make sure it's in the allowed range.
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// If a session to the destination exists, gets the session and passes the packet to it.
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// If no session exists, it triggers (or continues) a search.
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// If the session hasn't responded recently, it triggers a ping or search to keep things alive or deal with broken coords *relatively* quickly.
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// It also deals with oversized packets if there are MTU issues by calling into icmpv6.go to spoof PacketTooBig traffic, or DestinationUnreachable if the other side has their adapter disabled.
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func (r *router) sendPacket(bs []byte) {
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var sourceAddr address.Address
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var destAddr address.Address
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var destSnet address.Subnet
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var destPubKey *crypto.BoxPubKey
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var destNodeID *crypto.NodeID
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var addrlen int
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if bs[0]&0xf0 == 0x60 {
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// Check if we have a fully-sized header
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if len(bs) < 40 {
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panic("Tried to send a packet shorter than an IPv6 header...")
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}
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// IPv6 address
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addrlen = 16
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copy(sourceAddr[:addrlen], bs[8:])
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copy(destAddr[:addrlen], bs[24:])
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copy(destSnet[:addrlen/2], bs[24:])
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} else if bs[0]&0xf0 == 0x40 {
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// Check if we have a fully-sized header
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if len(bs) < 20 {
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panic("Tried to send a packet shorter than an IPv4 header...")
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}
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// IPv4 address
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addrlen = 4
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copy(sourceAddr[:addrlen], bs[12:])
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copy(destAddr[:addrlen], bs[16:])
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} else {
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// Unknown address length
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return
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}
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if !r.cryptokey.isValidSource(sourceAddr, addrlen) {
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// The packet had a source address that doesn't belong to us or our
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// configured crypto-key routing source subnets
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return
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}
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if !destAddr.IsValid() && !destSnet.IsValid() {
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// The addresses didn't match valid Yggdrasil node addresses so let's see
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// whether it matches a crypto-key routing range instead
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if key, err := r.cryptokey.getPublicKeyForAddress(destAddr, addrlen); err == nil {
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// A public key was found, get the node ID for the search
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destPubKey = &key
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destNodeID = crypto.GetNodeID(destPubKey)
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// Do a quick check to ensure that the node ID refers to a vaild Yggdrasil
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// address or subnet - this might be superfluous
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addr := *address.AddrForNodeID(destNodeID)
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copy(destAddr[:], addr[:])
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copy(destSnet[:], addr[:])
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if !destAddr.IsValid() && !destSnet.IsValid() {
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return
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}
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} else {
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// No public key was found in the CKR table so we've exhausted our options
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return
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}
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}
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searchCompleted := func(sinfo *sessionInfo, err error) {
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if err != nil {
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r.core.log.Debugln("DHT search failed:", err)
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return
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}
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}
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doSearch := func(packet []byte) {
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var nodeID, mask *crypto.NodeID
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switch {
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case destNodeID != nil:
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// We already know the full node ID, probably because it's from a CKR
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// route in which the public key is known ahead of time
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nodeID = destNodeID
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var m crypto.NodeID
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for i := range m {
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m[i] = 0xFF
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}
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mask = &m
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case destAddr.IsValid():
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// We don't know the full node ID - try and use the address to generate
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// a truncated node ID
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nodeID, mask = destAddr.GetNodeIDandMask()
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case destSnet.IsValid():
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// We don't know the full node ID - try and use the subnet to generate
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// a truncated node ID
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nodeID, mask = destSnet.GetNodeIDandMask()
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default:
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return
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}
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sinfo, isIn := r.core.searches.searches[*nodeID]
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if !isIn {
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sinfo = r.core.searches.newIterSearch(nodeID, mask, searchCompleted)
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}
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if packet != nil {
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sinfo.packet = packet
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}
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r.core.searches.continueSearch(sinfo)
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}
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var sinfo *sessionInfo
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var isIn bool
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if destAddr.IsValid() {
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sinfo, isIn = r.core.sessions.getByTheirAddr(&destAddr)
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}
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if destSnet.IsValid() {
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sinfo, isIn = r.core.sessions.getByTheirSubnet(&destSnet)
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}
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sTime := sinfo.time.Load().(time.Time)
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pingTime := sinfo.pingTime.Load().(time.Time)
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pingSend := sinfo.pingSend.Load().(time.Time)
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switch {
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case !isIn || !sinfo.init.Load().(bool):
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// No or unintiialized session, so we need to search first
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doSearch(bs)
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case time.Since(sTime) > 6*time.Second:
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if sTime.Before(pingTime) && time.Since(pingTime) > 6*time.Second {
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// We haven't heard from the dest in a while
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// We tried pinging but didn't get a response
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// They may have changed coords
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// Try searching to discover new coords
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// Note that search spam is throttled internally
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doSearch(nil)
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} else {
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// We haven't heard about the dest in a while
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now := time.Now()
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if !sTime.Before(pingTime) {
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// Update pingTime to start the clock for searches (above)
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sinfo.pingTime.Store(now)
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}
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if time.Since(pingSend) > time.Second {
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// Send at most 1 ping per second
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sinfo.pingSend.Store(now)
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r.core.sessions.sendPingPong(sinfo, false)
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}
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}
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fallthrough // Also send the packet
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default:
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// If we know the public key ahead of time (i.e. a CKR route) then check
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// if the session perm pub key matches before we send the packet to it
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if destPubKey != nil {
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if !bytes.Equal((*destPubKey)[:], sinfo.theirPermPub[:]) {
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return
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}
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}
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// Drop packets if the session MTU is 0 - this means that one or other
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// side probably has their TUN adapter disabled
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if sinfo.getMTU() == 0 {
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// Don't continue - drop the packet
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return
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}
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// Generate an ICMPv6 Packet Too Big for packets larger than session MTU
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if len(bs) > int(sinfo.getMTU()) {
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// Get the size of the oversized payload, up to a max of 900 bytes
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window := 900
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if int(sinfo.getMTU()) < window {
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window = int(sinfo.getMTU())
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}
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// Send the error back to the adapter
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r.reject <- RejectedPacket{
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Reason: PacketTooBig,
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Packet: bs[:window],
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Detail: int(sinfo.getMTU()),
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}
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// Don't continue - drop the packet
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return
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}
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sinfo.send <- bs
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}
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}
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*/
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// Checks incoming traffic type and passes it to the appropriate handler.
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// Checks incoming traffic type and passes it to the appropriate handler.
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func (r *router) handleIn(packet []byte) {
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func (r *router) handleIn(packet []byte) {
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pType, pTypeLen := wire_decode_uint64(packet)
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pType, pTypeLen := wire_decode_uint64(packet)
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