mirror of
https://github.com/yggdrasil-network/yggdrasil-go.git
synced 2024-11-27 12:05:23 +00:00
split up some of the tun reader logic into a separate worker, so the main loop can be mostly just syscalls
This commit is contained in:
Arceliar
parent
b66bea813b
commit
38e1503b28
@ -112,6 +112,164 @@ func (tun *TunAdapter) writer() error {
|
||||
|
||||
func (tun *TunAdapter) reader() error {
|
||||
recvd := make([]byte, 65535+tun_ETHER_HEADER_LENGTH)
|
||||
toWorker := make(chan []byte, 32)
|
||||
defer close(toWorker)
|
||||
go func() {
|
||||
for bs := range toWorker {
|
||||
// If we detect an ICMP packet then hand it to the ICMPv6 module
|
||||
if bs[6] == 58 {
|
||||
// Found an ICMPv6 packet - we need to make sure to give ICMPv6 the full
|
||||
// Ethernet frame rather than just the IPv6 packet as this is needed for
|
||||
// NDP to work correctly
|
||||
if err := tun.icmpv6.ParsePacket(recvd); err == nil {
|
||||
// We acted on the packet in the ICMPv6 module so don't forward or do
|
||||
// anything else with it
|
||||
continue
|
||||
}
|
||||
}
|
||||
// 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
|
||||
// the packet
|
||||
var srcAddr address.Address
|
||||
var dstAddr address.Address
|
||||
var dstNodeID *crypto.NodeID
|
||||
var dstNodeIDMask *crypto.NodeID
|
||||
var dstSnet address.Subnet
|
||||
var addrlen int
|
||||
n := len(bs)
|
||||
// Check the IP protocol - if it doesn't match then we drop the packet and
|
||||
// do nothing with it
|
||||
if bs[0]&0xf0 == 0x60 {
|
||||
// Check if we have a fully-sized IPv6 header
|
||||
if len(bs) < 40 {
|
||||
continue
|
||||
}
|
||||
// Check the packet size
|
||||
if n-tun_IPv6_HEADER_LENGTH != 256*int(bs[4])+int(bs[5]) {
|
||||
continue
|
||||
}
|
||||
// IPv6 address
|
||||
addrlen = 16
|
||||
copy(srcAddr[:addrlen], bs[8:])
|
||||
copy(dstAddr[:addrlen], bs[24:])
|
||||
copy(dstSnet[:addrlen/2], bs[24:])
|
||||
} else if bs[0]&0xf0 == 0x40 {
|
||||
// Check if we have a fully-sized IPv4 header
|
||||
if len(bs) < 20 {
|
||||
continue
|
||||
}
|
||||
// Check the packet size
|
||||
if n != 256*int(bs[2])+int(bs[3]) {
|
||||
continue
|
||||
}
|
||||
// IPv4 address
|
||||
addrlen = 4
|
||||
copy(srcAddr[:addrlen], bs[12:])
|
||||
copy(dstAddr[:addrlen], bs[16:])
|
||||
} else {
|
||||
// Unknown address length or protocol, so drop the packet and ignore it
|
||||
tun.log.Traceln("Unknown packet type, dropping")
|
||||
continue
|
||||
}
|
||||
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
|
||||
}
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
if key, err := tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
|
||||
// A public key was found, get the node ID for the search
|
||||
dstNodeID = crypto.GetNodeID(&key)
|
||||
// Do a quick check to ensure that the node ID refers to a vaild
|
||||
// Yggdrasil address or subnet - this might be superfluous
|
||||
addr := *address.AddrForNodeID(dstNodeID)
|
||||
copy(dstAddr[:], addr[:])
|
||||
copy(dstSnet[:], addr[:])
|
||||
// Are we certain we looked up a valid node?
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
continue
|
||||
}
|
||||
} else {
|
||||
// No public key was found in the CKR table so we've exhausted our options
|
||||
continue
|
||||
}
|
||||
}
|
||||
// Do we have an active connection for this node address?
|
||||
tun.mutex.RLock()
|
||||
session, isIn := tun.addrToConn[dstAddr]
|
||||
if !isIn || session == nil {
|
||||
session, isIn = tun.subnetToConn[dstSnet]
|
||||
if !isIn || session == nil {
|
||||
// Neither an address nor a subnet mapping matched, therefore populate
|
||||
// the node ID and mask to commence a search
|
||||
if dstAddr.IsValid() {
|
||||
dstNodeID, dstNodeIDMask = dstAddr.GetNodeIDandMask()
|
||||
} else {
|
||||
dstNodeID, dstNodeIDMask = dstSnet.GetNodeIDandMask()
|
||||
}
|
||||
}
|
||||
}
|
||||
tun.mutex.RUnlock()
|
||||
// If we don't have a connection then we should open one
|
||||
if !isIn || session == nil {
|
||||
// Check we haven't been given empty node ID, really this shouldn't ever
|
||||
// happen but just to be sure...
|
||||
if dstNodeID == nil || dstNodeIDMask == nil {
|
||||
panic("Given empty dstNodeID and dstNodeIDMask - this shouldn't happen")
|
||||
}
|
||||
// Dial to the remote node
|
||||
packet := bs
|
||||
go func() {
|
||||
// FIXME just spitting out a goroutine to do this is kind of ugly and means we drop packets until the dial finishes
|
||||
tun.mutex.Lock()
|
||||
_, known := tun.dials[*dstNodeID]
|
||||
tun.dials[*dstNodeID] = append(tun.dials[*dstNodeID], packet)
|
||||
for len(tun.dials[*dstNodeID]) > 32 {
|
||||
util.PutBytes(tun.dials[*dstNodeID][0])
|
||||
tun.dials[*dstNodeID] = tun.dials[*dstNodeID][1:]
|
||||
}
|
||||
tun.mutex.Unlock()
|
||||
if known {
|
||||
return
|
||||
}
|
||||
var tc *tunConn
|
||||
if conn, err := tun.dialer.DialByNodeIDandMask(dstNodeID, dstNodeIDMask); err == nil {
|
||||
// We've been given a connection so prepare the session wrapper
|
||||
if tc, err = tun.wrap(conn); err != nil {
|
||||
// Something went wrong when storing the connection, typically that
|
||||
// something already exists for this address or subnet
|
||||
tun.log.Debugln("TUN/TAP iface wrap:", err)
|
||||
}
|
||||
}
|
||||
tun.mutex.Lock()
|
||||
packets := tun.dials[*dstNodeID]
|
||||
delete(tun.dials, *dstNodeID)
|
||||
tun.mutex.Unlock()
|
||||
if tc != nil {
|
||||
for _, packet := range packets {
|
||||
select {
|
||||
case tc.send <- packet:
|
||||
default:
|
||||
util.PutBytes(packet)
|
||||
}
|
||||
}
|
||||
}
|
||||
}()
|
||||
// While the dial is going on we can't do much else
|
||||
// continuing this iteration - skip to the next one
|
||||
continue
|
||||
}
|
||||
// If we have a connection now, try writing to it
|
||||
if isIn && session != nil {
|
||||
packet := bs
|
||||
select {
|
||||
case session.send <- packet:
|
||||
default:
|
||||
util.PutBytes(packet)
|
||||
}
|
||||
}
|
||||
}
|
||||
}()
|
||||
for {
|
||||
// Wait for a packet to be delivered to us through the TUN/TAP adapter
|
||||
n, err := tun.iface.Read(recvd)
|
||||
@ -137,158 +295,7 @@ func (tun *TunAdapter) reader() error {
|
||||
}
|
||||
// Offset the buffer from now on so that we can ignore ethernet frames if
|
||||
// they are present
|
||||
bs := recvd[offset : offset+n]
|
||||
n -= offset
|
||||
// If we detect an ICMP packet then hand it to the ICMPv6 module
|
||||
if bs[6] == 58 {
|
||||
// Found an ICMPv6 packet - we need to make sure to give ICMPv6 the full
|
||||
// Ethernet frame rather than just the IPv6 packet as this is needed for
|
||||
// NDP to work correctly
|
||||
if err := tun.icmpv6.ParsePacket(recvd); err == nil {
|
||||
// We acted on the packet in the ICMPv6 module so don't forward or do
|
||||
// anything else with it
|
||||
continue
|
||||
}
|
||||
}
|
||||
// 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
|
||||
// the packet
|
||||
var srcAddr address.Address
|
||||
var dstAddr address.Address
|
||||
var dstNodeID *crypto.NodeID
|
||||
var dstNodeIDMask *crypto.NodeID
|
||||
var dstSnet address.Subnet
|
||||
var addrlen int
|
||||
// Check the IP protocol - if it doesn't match then we drop the packet and
|
||||
// do nothing with it
|
||||
if bs[0]&0xf0 == 0x60 {
|
||||
// Check if we have a fully-sized IPv6 header
|
||||
if len(bs) < 40 {
|
||||
continue
|
||||
}
|
||||
// Check the packet size
|
||||
if n-tun_IPv6_HEADER_LENGTH != 256*int(bs[4])+int(bs[5]) {
|
||||
continue
|
||||
}
|
||||
// IPv6 address
|
||||
addrlen = 16
|
||||
copy(srcAddr[:addrlen], bs[8:])
|
||||
copy(dstAddr[:addrlen], bs[24:])
|
||||
copy(dstSnet[:addrlen/2], bs[24:])
|
||||
} else if bs[0]&0xf0 == 0x40 {
|
||||
// Check if we have a fully-sized IPv4 header
|
||||
if len(bs) < 20 {
|
||||
continue
|
||||
}
|
||||
// Check the packet size
|
||||
if n != 256*int(bs[2])+int(bs[3]) {
|
||||
continue
|
||||
}
|
||||
// IPv4 address
|
||||
addrlen = 4
|
||||
copy(srcAddr[:addrlen], bs[12:])
|
||||
copy(dstAddr[:addrlen], bs[16:])
|
||||
} else {
|
||||
// Unknown address length or protocol, so drop the packet and ignore it
|
||||
tun.log.Traceln("Unknown packet type, dropping")
|
||||
continue
|
||||
}
|
||||
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
|
||||
}
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
if key, err := tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
|
||||
// A public key was found, get the node ID for the search
|
||||
dstNodeID = crypto.GetNodeID(&key)
|
||||
// Do a quick check to ensure that the node ID refers to a vaild
|
||||
// Yggdrasil address or subnet - this might be superfluous
|
||||
addr := *address.AddrForNodeID(dstNodeID)
|
||||
copy(dstAddr[:], addr[:])
|
||||
copy(dstSnet[:], addr[:])
|
||||
// Are we certain we looked up a valid node?
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
continue
|
||||
}
|
||||
} else {
|
||||
// No public key was found in the CKR table so we've exhausted our options
|
||||
continue
|
||||
}
|
||||
}
|
||||
// Do we have an active connection for this node address?
|
||||
tun.mutex.RLock()
|
||||
session, isIn := tun.addrToConn[dstAddr]
|
||||
if !isIn || session == nil {
|
||||
session, isIn = tun.subnetToConn[dstSnet]
|
||||
if !isIn || session == nil {
|
||||
// Neither an address nor a subnet mapping matched, therefore populate
|
||||
// the node ID and mask to commence a search
|
||||
if dstAddr.IsValid() {
|
||||
dstNodeID, dstNodeIDMask = dstAddr.GetNodeIDandMask()
|
||||
} else {
|
||||
dstNodeID, dstNodeIDMask = dstSnet.GetNodeIDandMask()
|
||||
}
|
||||
}
|
||||
}
|
||||
tun.mutex.RUnlock()
|
||||
// If we don't have a connection then we should open one
|
||||
if !isIn || session == nil {
|
||||
// Check we haven't been given empty node ID, really this shouldn't ever
|
||||
// happen but just to be sure...
|
||||
if dstNodeID == nil || dstNodeIDMask == nil {
|
||||
panic("Given empty dstNodeID and dstNodeIDMask - this shouldn't happen")
|
||||
}
|
||||
// Dial to the remote node
|
||||
packet := append(util.GetBytes(), bs[:n]...)
|
||||
go func() {
|
||||
// FIXME just spitting out a goroutine to do this is kind of ugly and means we drop packets until the dial finishes
|
||||
tun.mutex.Lock()
|
||||
_, known := tun.dials[*dstNodeID]
|
||||
tun.dials[*dstNodeID] = append(tun.dials[*dstNodeID], packet)
|
||||
for len(tun.dials[*dstNodeID]) > 32 {
|
||||
util.PutBytes(tun.dials[*dstNodeID][0])
|
||||
tun.dials[*dstNodeID] = tun.dials[*dstNodeID][1:]
|
||||
}
|
||||
tun.mutex.Unlock()
|
||||
if known {
|
||||
return
|
||||
}
|
||||
var tc *tunConn
|
||||
if conn, err := tun.dialer.DialByNodeIDandMask(dstNodeID, dstNodeIDMask); err == nil {
|
||||
// We've been given a connection so prepare the session wrapper
|
||||
if tc, err = tun.wrap(conn); err != nil {
|
||||
// Something went wrong when storing the connection, typically that
|
||||
// something already exists for this address or subnet
|
||||
tun.log.Debugln("TUN/TAP iface wrap:", err)
|
||||
}
|
||||
}
|
||||
tun.mutex.Lock()
|
||||
packets := tun.dials[*dstNodeID]
|
||||
delete(tun.dials, *dstNodeID)
|
||||
tun.mutex.Unlock()
|
||||
if tc != nil {
|
||||
for _, packet := range packets {
|
||||
select {
|
||||
case tc.send <- packet:
|
||||
default:
|
||||
util.PutBytes(packet)
|
||||
}
|
||||
}
|
||||
}
|
||||
}()
|
||||
// While the dial is going on we can't do much else
|
||||
// continuing this iteration - skip to the next one
|
||||
continue
|
||||
}
|
||||
// If we have a connection now, try writing to it
|
||||
if isIn && session != nil {
|
||||
packet := append(util.GetBytes(), bs[:n]...)
|
||||
select {
|
||||
case session.send <- packet:
|
||||
default:
|
||||
util.PutBytes(packet)
|
||||
}
|
||||
}
|
||||
bs := append(util.GetBytes(), recvd[offset:offset+n]...)
|
||||
toWorker <- bs
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user