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Use larger UDP chunks for link-local IP and let the OS fragment it. Switch to UDP for link-local peers. Minor code cleanup for TCP.

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This commit is contained in:
Arceliar 2018-02-19 19:34:51 -06:00
parent 8c7d514032
commit 4045597516
4 changed files with 53 additions and 47 deletions
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26
src/yggdrasil/tcp.go
View File

@ -158,18 +158,7 @@ func (iface *tcpInterface) handler(sock *net.TCPConn) {
}
out := make(chan []byte, 32) // TODO? what size makes sense
defer close(out)
go func() {
var stack [][]byte
put := func(msg []byte) {
stack = append(stack, msg)
for len(stack) > 32 {
util_putBytes(stack[0])
stack = stack[1:]
}
}
send := func() {
msg := stack[len(stack)-1]
stack = stack[:len(stack)-1]
send := func(msg []byte) {
buf := net.Buffers{tcp_msg[:],
wire_encode_uint64(uint64(len(msg))),
msg}
@ -186,6 +175,15 @@ func (iface *tcpInterface) handler(sock *net.TCPConn) {
}
util_putBytes(msg)
}
go func() {
var stack [][]byte
put := func(msg []byte) {
stack = append(stack, msg)
for len(stack) > 32 {
util_putBytes(stack[0])
stack = stack[1:]
}
}
for msg := range out {
put(msg)
for len(stack) > 0 {
@ -197,7 +195,9 @@ func (iface *tcpInterface) handler(sock *net.TCPConn) {
}
put(msg)
default:
send()
msg := stack[len(stack)-1]
stack = stack[:len(stack)-1]
send(msg)
}
}
}

20
src/yggdrasil/udp.go
View File

@ -56,6 +56,7 @@ type connInfo struct {
out chan []byte
countIn uint8
countOut uint8
chunkSize uint16
}
type udpKeys struct {
@ -73,6 +74,8 @@ func (iface *udpInterface) init(core *Core, addr string) {
if err != nil {
panic(err)
}
//iface.sock.SetReadBuffer(1048576)
//iface.sock.SetWriteBuffer(1048576)
iface.conns = make(map[connAddr]*connInfo)
go iface.reader()
}
@ -168,6 +171,10 @@ func (iface *udpInterface) handleKeys(msg []byte, addr connAddr) {
linkIn: make(chan []byte, 1),
keysIn: make(chan *udpKeys, 1),
out: make(chan []byte, 32),
chunkSize: 576 - 60 - 8 - 3, // max save - max ip - udp header - chunk overhead
}
if udpAddr.IP.IsLinkLocalUnicast() {
conn.chunkSize = 65535 - 8 - 3
}
/*
conn.in = func (msg []byte) { conn.peer.handlePacket(msg, conn.linkIn) }
@ -236,8 +243,8 @@ func (iface *udpInterface) handleKeys(msg []byte, addr connAddr) {
for msg := range conn.out {
chunks = chunks[:0]
bs := msg
for len(bs) > udp_chunkSize {
chunks, bs = append(chunks, bs[:udp_chunkSize]), bs[udp_chunkSize:]
for len(bs) > int(conn.chunkSize) {
chunks, bs = append(chunks, bs[:conn.chunkSize]), bs[conn.chunkSize:]
}
chunks = append(chunks, bs)
//iface.core.log.Println("DEBUG: out chunks:", len(chunks), len(msg))
@ -284,7 +291,7 @@ func (iface *udpInterface) handlePacket(msg []byte, addr connAddr) {
}
func (iface *udpInterface) reader() {
bs := make([]byte, 2048) // This needs to be large enough for everything...
bs := make([]byte, 65536) // This needs to be large enough for everything...
for {
//iface.core.log.Println("Starting read")
n, udpAddr, err := iface.sock.ReadFromUDP(bs)
@ -293,9 +300,7 @@ func (iface *udpInterface) reader() {
panic(err)
break
}
if n > 1500 {
panic(n)
}
//iface.core.log.Println("DEBUG: recv len:", n)
//msg := append(util_getBytes(), bs[:n]...)
msg := bs[:n]
var addr connAddr
@ -319,7 +324,8 @@ func (iface *udpInterface) reader() {
////////////////////////////////////////////////////////////////////////////////
const udp_chunkSize = 508 // Apparently the maximum guaranteed safe IPv4 size
//const udp_chunkSize = 508 // Apparently the maximum guaranteed safe IPv4 size
//const udp_chunkSize = 65535 - 3 - 8
func udp_decode(bs []byte) (chunks, chunk, count uint8, payload []byte) {
if len(bs) >= 3 {

2
src/yggdrasil/wire.go
View File

@ -21,7 +21,7 @@ const (
wire_DHTLookupResponse // inside protocol traffic header
wire_SearchRequest // inside protocol traffic header
wire_SearchResponse // inside protocol traffic header
//wire_Keys // udp key packet (boxPub, sigPub)
wire_Keys // udp key packet (boxPub, sigPub)
)
// Encode uint64 using a variable length scheme

6
yggdrasil.go
View File

@ -177,7 +177,7 @@ func (n *node) listen() {
saddr := addr.String()
//if _, isIn := n.peers[saddr]; isIn { continue }
//n.peers[saddr] = struct{}{}
n.core.DEBUG_addTCPConn(saddr) // FIXME? can result in 2 connections per peer
n.core.DEBUG_maybeSendUDPKeys(saddr) // FIXME? can result in 2 connections per peer
//fmt.Println("DEBUG:", "added multicast peer:", saddr)
}
}
@ -188,8 +188,8 @@ func (n *node) announce() {
panic(err)
}
var anAddr net.TCPAddr
tcpAddr := n.core.DEBUG_getGlobalTCPAddr()
anAddr.Port = tcpAddr.Port
myAddr := n.core.DEBUG_getGlobalUDPAddr()
anAddr.Port = myAddr.Port
destAddr, err := net.ResolveUDPAddr("udp6", multicastAddr)
if err != nil {
panic(err)