tcp reuse: remove old code

src/stream-tcp.c

@@ -4551,60 +4551,8 @@ int StreamTcpPacket (ThreadVars *tv, Packet *p, StreamTcpThread *stt,
                 }
                 break;
             case TCP_CLOSED:
-                /* TCP session memory is not returned to pool until timeout.
-                 * If in the mean time we receive any other session from
-                 * the same client reusing same port then we switch back to
-                 * tcp state none, but only on a valid SYN that is not a
-                 * resend from our previous session.
-                 *
-                 * We also check it's not a SYN/ACK, all other SYN pkt
-                 * validation is done at StreamTcpPacketStateNone();
-                 */
-                if (PKT_IS_TOSERVER(p) && (p->tcph->th_flags & TH_SYN) &&
-                    !(p->tcph->th_flags & TH_ACK) &&
-                    !(SEQ_EQ(ssn->client.isn, TCP_GET_SEQ(p))))
-                {
-                    SCLogDebug("reusing closed TCP session");
-
-                    /* return segments */
-                    StreamTcpReturnStreamSegments(&ssn->client);
-                    StreamTcpReturnStreamSegments(&ssn->server);
-                    /* free SACK list */
-                    StreamTcpSackFreeList(&ssn->client);
-                    StreamTcpSackFreeList(&ssn->server);
-                    /* reset the app layer state */
-                    FlowCleanupAppLayer(p->flow);
-
-                    ssn->state = 0;
-                    ssn->flags = 0;
-                    ssn->client.flags = 0;
-                    ssn->server.flags = 0;
-
-                    /* set state the NONE, also pulls flow out of closed queue */
-                    StreamTcpPacketSetState(p, ssn, TCP_NONE);
-
-                    p->flow->alproto_ts = p->flow->alproto_tc = p->flow->alproto = ALPROTO_UNKNOWN;
-                    p->flow->data_al_so_far[0] = p->flow->data_al_so_far[1] = 0;
-                    ssn->data_first_seen_dir = 0;
-                    p->flow->flags &= (~FLOW_TS_PM_ALPROTO_DETECT_DONE &
-                                       ~FLOW_TS_PP_ALPROTO_DETECT_DONE &
-                                       ~FLOW_TC_PM_ALPROTO_DETECT_DONE &
-                                       ~FLOW_TC_PP_ALPROTO_DETECT_DONE);
-                    p->flow->flags &= ~ FLOW_NO_APPLAYER_INSPECTION;
-                    if (p->flow->de_state != NULL) {
-                        SCMutexLock(&p->flow->de_state_m);
-                        DetectEngineStateReset(p->flow->de_state, (STREAM_TOSERVER | STREAM_TOCLIENT));
-                        SCMutexUnlock(&p->flow->de_state_m);
-                    }
-
-                    if (StreamTcpPacketStateNone(tv,p,stt,ssn, &stt->pseudo_queue)) {
-                        goto error;
-                    }
-
-                    SCPerfCounterIncr(stt->counter_tcp_reused_ssn, tv->sc_perf_pca);
-                } else {
-                    SCLogDebug("packet received on closed state");
-                }
+                /* TCP session memory is not returned to pool until timeout. */
+                SCLogDebug("packet received on closed state");
                 break;
             default:
                 SCLogDebug("packet received on default state");