diff options
Diffstat (limited to 'pkg/tcpip/stack/conntrack.go')
| -rw-r--r-- | pkg/tcpip/stack/conntrack.go | 52 |
1 files changed, 30 insertions, 22 deletions
diff --git a/pkg/tcpip/stack/conntrack.go b/pkg/tcpip/stack/conntrack.go index 3583d93c6..89f8ef09f 100644 --- a/pkg/tcpip/stack/conntrack.go +++ b/pkg/tcpip/stack/conntrack.go @@ -37,6 +37,11 @@ import ( // Our hash table has 16K buckets. const numBuckets = 1 << 14 +const ( + establishedTimeout time.Duration = 5 * 24 * time.Hour + unestablishedTimeout time.Duration = 120 * time.Second +) + // tuple holds a connection's identifying and manipulating data in one // direction. It is immutable. // @@ -128,8 +133,6 @@ type conn struct { // timedOut returns whether the connection timed out based on its state. func (cn *conn) timedOut(now tcpip.MonotonicTime) bool { - const establishedTimeout = 5 * 24 * time.Hour - const defaultTimeout = 120 * time.Second cn.mu.RLock() defer cn.mu.RUnlock() if cn.tcb.State() == tcpconntrack.ResultAlive { @@ -139,7 +142,7 @@ func (cn *conn) timedOut(now tcpip.MonotonicTime) bool { } // Use the same default as Linux, which lets connections in most states // other than established remain for <= 120 seconds. - return now.Sub(cn.lastUsed) > defaultTimeout + return now.Sub(cn.lastUsed) > unestablishedTimeout } // update the connection tracking state. @@ -403,7 +406,7 @@ func (cn *conn) performNATIfNoop(port uint16, address tcpip.Address, dnat bool) // has had NAT performed on it. // // Returns true if the packet can skip the NAT table. -func (cn *conn) handlePacket(pkt *PacketBuffer, hook Hook, r *Route) bool { +func (cn *conn) handlePacket(pkt *PacketBuffer, hook Hook, rt *Route) bool { transportHeader, ok := getTransportHeader(pkt) if !ok { return false @@ -432,7 +435,7 @@ func (cn *conn) handlePacket(pkt *PacketBuffer, hook Hook, r *Route) bool { case Postrouting: if pkt.TransportProtocolNumber == header.TCPProtocolNumber && pkt.GSOOptions.Type != GSONone && pkt.GSOOptions.NeedsCsum { updatePseudoHeader = true - } else if r.RequiresTXTransportChecksum() { + } else if rt.RequiresTXTransportChecksum() { fullChecksum = true updatePseudoHeader = true } @@ -453,6 +456,11 @@ func (cn *conn) handlePacket(pkt *PacketBuffer, hook Hook, r *Route) bool { cn.mu.Lock() defer cn.mu.Unlock() + // Mark the connection as having been used recently so it isn't reaped. + cn.lastUsed = cn.ct.clock.NowMonotonic() + // Update connection state. + cn.updateLocked(pkt, reply) + var tuple *tuple if reply { if dnat { @@ -476,11 +484,6 @@ func (cn *conn) handlePacket(pkt *PacketBuffer, hook Hook, r *Route) bool { tuple = &cn.reply } - // Mark the connection as having been used recently so it isn't reaped. - cn.lastUsed = cn.ct.clock.NowMonotonic() - // Update connection state. - cn.updateLocked(pkt, reply) - return tuple.id(), true }() if !performManip { @@ -598,24 +601,29 @@ func (ct *ConnTrack) reapTupleLocked(tuple *tuple, bktID int, bkt *bucket, now t return false } - // To maintain lock order, we can only reap these tuples if the reply - // appears later in the table. + // To maintain lock order, we can only reap both tuples if the reply appears + // later in the table. replyBktID := ct.bucket(tuple.id().reply()) - if bktID > replyBktID { + tuple.conn.mu.RLock() + replyTupleInserted := tuple.conn.finalized + tuple.conn.mu.RUnlock() + if bktID > replyBktID && replyTupleInserted { return true } - // Don't re-lock if both tuples are in the same bucket. - if bktID != replyBktID { - replyBkt := &ct.buckets[replyBktID] - replyBkt.mu.Lock() - removeConnFromBucket(replyBkt, tuple) - replyBkt.mu.Unlock() - } else { - removeConnFromBucket(bkt, tuple) + // Reap the reply. + if replyTupleInserted { + // Don't re-lock if both tuples are in the same bucket. + if bktID != replyBktID { + replyBkt := &ct.buckets[replyBktID] + replyBkt.mu.Lock() + removeConnFromBucket(replyBkt, tuple) + replyBkt.mu.Unlock() + } else { + removeConnFromBucket(bkt, tuple) + } } - // We have the buckets locked and can remove both tuples. bkt.tuples.Remove(tuple) return true } |