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Merge pull request #82 from neilalexander/admin

Track TX/RX bytes over session and if MTU was adjusted, adjust MTU exchange behaviour, send session pings on TUN/TAP change
This commit is contained in:
Arceliar 2018-05-18 17:26:33 -05:00 committed by GitHub
commit fdb826578f
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3 changed files with 49 additions and 1 deletions

View File

@ -280,6 +280,17 @@ func (a *admin) startTunWithMTU(ifname string, iftapmode bool, ifmtu int) error
if err != nil {
return err
}
// If we have open sessions then we need to notify them
// that our MTU has now changed
for _, sinfo := range a.core.sessions.sinfos {
if ifname == "none" {
sinfo.myMTU = 0
} else {
sinfo.myMTU = uint16(ifmtu)
}
a.core.sessions.sendPingPong(sinfo, false)
}
// Aaaaand... go!
go a.core.tun.read()
}
go a.core.tun.write()
@ -374,6 +385,9 @@ func (a *admin) getData_getSessions() []admin_nodeInfo {
{"IP", net.IP(sinfo.theirAddr[:]).String()},
{"coords", fmt.Sprint(sinfo.coords)},
{"MTU", fmt.Sprint(sinfo.getMTU())},
{"wasMTUFixed", fmt.Sprint(sinfo.wasMTUFixed)},
{"bytesSent", fmt.Sprint(sinfo.bytesSent)},
{"bytesRecvd", fmt.Sprint(sinfo.bytesRecvd)},
}
infos = append(infos, info)
}

View File

@ -164,6 +164,31 @@ func (r *router) sendPacket(bs []byte) {
}
fallthrough // Also send the packet
default:
// Drop packets if the session MTU is 0 - this means that one or other
// side probably has their TUN adapter disabled
if sinfo.getMTU() == 0 {
// Get the size of the oversized payload, up to a max of 900 bytes
window := 900
if len(bs) < window {
window = len(bs)
}
// Create the Destination Unreachable response
ptb := &icmp.DstUnreach{
Data: bs[:window],
}
// Create the ICMPv6 response from it
icmpv6Buf, err := r.core.tun.icmpv6.create_icmpv6_tun(
bs[8:24], bs[24:40],
ipv6.ICMPTypeDestinationUnreachable, 1, ptb)
if err == nil {
r.recv <- icmpv6Buf
}
// Don't continue - drop the packet
return
}
// Generate an ICMPv6 Packet Too Big for packets larger than session MTU
if len(bs) > int(sinfo.getMTU()) {
// Get the size of the oversized payload, up to a max of 900 bytes

View File

@ -21,6 +21,7 @@ type sessionInfo struct {
myNonce boxNonce
theirMTU uint16
myMTU uint16
wasMTUFixed bool // Was the MTU fixed by a receive error?
time time.Time // Time we last received a packet
coords []byte // coords of destination
packet []byte // a buffered packet, sent immediately on ping/pong
@ -32,6 +33,8 @@ type sessionInfo struct {
mtuTime time.Time // time myMTU was last changed
pingTime time.Time // time the first ping was sent since the last received packet
pingSend time.Time // time the last ping was sent
bytesSent uint64 // Bytes of real traffic sent in this session
bytesRecvd uint64 // Bytes of real traffic received in this session
}
type sessionPing struct {
@ -62,7 +65,7 @@ func (s *sessionInfo) update(p *sessionPing) bool {
s.theirNonce = boxNonce{}
s.nonceMask = 0
}
if p.mtu >= 1280 {
if p.mtu >= 1280 || p.mtu == 0 {
s.theirMTU = p.mtu
}
s.coords = append([]byte{}, p.coords...)
@ -310,6 +313,9 @@ func (n *boxNonce) minus(m *boxNonce) int64 {
}
func (sinfo *sessionInfo) getMTU() uint16 {
if sinfo.theirMTU == 0 || sinfo.myMTU == 0 {
return 0
}
if sinfo.theirMTU < sinfo.myMTU {
return sinfo.theirMTU
}
@ -384,6 +390,7 @@ func (sinfo *sessionInfo) doSend(bs []byte) {
payload: payload,
}
packet := p.encode()
sinfo.bytesSent += uint64(len(bs))
sinfo.core.router.out(packet)
}
@ -411,6 +418,7 @@ func (sinfo *sessionInfo) doRecv(p *wire_trafficPacket) {
//sinfo.core.log.Println("DEBUG set MTU to:", sinfo.myMTU)
sinfo.core.sessions.sendPingPong(sinfo, false)
sinfo.mtuTime = time.Now()
sinfo.wasMTUFixed = true
}
}
go func() { sinfo.core.router.admin <- fixSessionMTU }()
@ -427,5 +435,6 @@ func (sinfo *sessionInfo) doRecv(p *wire_trafficPacket) {
go func() { sinfo.core.router.admin <- fixSessionMTU }()
sinfo.updateNonce(&p.nonce)
sinfo.time = time.Now()
sinfo.bytesRecvd += uint64(len(bs))
sinfo.core.router.recvPacket(bs, &sinfo.theirAddr, &sinfo.theirSubnet)
}