int DecodeUDP(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq)
{
SCPerfCounterIncr(dtv->counter_udp, tv->sc_perf_pca);
if (unlikely(DecodeUDPPacket(tv, p,pkt,len) < 0)) {
p->udph = NULL;
return TM_ECODE_FAILED;
}
SCLogDebug("UDP sp: %" PRIu32 " -> dp: %" PRIu32 " - HLEN: %" PRIu32 " LEN: %" PRIu32 "",
UDP_GET_SRC_PORT(p), UDP_GET_DST_PORT(p), UDP_HEADER_LEN, p->payload_len);
if (unlikely(DecodeTeredo(tv, dtv, p, p->payload, p->payload_len, pq) == TM_ECODE_OK)) {
/* Here we have a Teredo packet and don't need to handle app
* layer */
FlowHandlePacket(tv, p);
return TM_ECODE_OK;
}
/* Flow is an integral part of us */
FlowHandlePacket(tv, p);
/* handle the app layer part of the UDP packet payload */
if (unlikely(p->flow != NULL)) {
AppLayerHandleUdp(&dtv->udp_dp_ctx, p->flow, p);
}
return TM_ECODE_OK;
}
static TmEcode FlowWorker(ThreadVars *tv, Packet *p, void *data, PacketQueue *preq, PacketQueue *unused)
{
FlowWorkerThreadData *fw = data;
void *detect_thread = SC_ATOMIC_GET(fw->detect_thread);
SCLogDebug("packet %"PRIu64, p->pcap_cnt);
/* update time */
if (!(PKT_IS_PSEUDOPKT(p))) {
TimeSetByThread(tv->id, &p->ts);
}
/* handle Flow */
if (p->flags & PKT_WANTS_FLOW) {
FLOWWORKER_PROFILING_START(p, PROFILE_FLOWWORKER_FLOW);
FlowHandlePacket(tv, fw->dtv, p);
if (likely(p->flow != NULL)) {
DEBUG_ASSERT_FLOW_LOCKED(p->flow);
if (FlowUpdate(p) == TM_ECODE_DONE) {
FLOWLOCK_UNLOCK(p->flow);
return TM_ECODE_OK;
}
}
/* Flow is now LOCKED */
FLOWWORKER_PROFILING_END(p, PROFILE_FLOWWORKER_FLOW);
/* if PKT_WANTS_FLOW is not set, but PKT_HAS_FLOW is, then this is a
* pseudo packet created by the flow manager. */
} else if (p->flags & PKT_HAS_FLOW) {
FLOWLOCK_WRLOCK(p->flow);
}
SCLogDebug("packet %"PRIu64" has flow? %s", p->pcap_cnt, p->flow ? "yes" : "no");
/* handle TCP and app layer */
if (p->flow && PKT_IS_TCP(p)) {
SCLogDebug("packet %"PRIu64" is TCP. Direction %s", p->pcap_cnt, PKT_IS_TOSERVER(p) ? "TOSERVER" : "TOCLIENT");
DEBUG_ASSERT_FLOW_LOCKED(p->flow);
/* if detect is disabled, we need to apply file flags to the flow
* here on the first packet. */
if (detect_thread == NULL &&
((PKT_IS_TOSERVER(p) && (p->flowflags & FLOW_PKT_TOSERVER_FIRST)) ||
(PKT_IS_TOCLIENT(p) && (p->flowflags & FLOW_PKT_TOCLIENT_FIRST))))
{
DisableDetectFlowFileFlags(p->flow);
}
FLOWWORKER_PROFILING_START(p, PROFILE_FLOWWORKER_STREAM);
StreamTcp(tv, p, fw->stream_thread, &fw->pq, NULL);
FLOWWORKER_PROFILING_END(p, PROFILE_FLOWWORKER_STREAM);
if (FlowChangeProto(p->flow)) {
StreamTcpDetectLogFlush(tv, fw->stream_thread, p->flow, p, &fw->pq);
}
/* Packets here can safely access p->flow as it's locked */
SCLogDebug("packet %"PRIu64": extra packets %u", p->pcap_cnt, fw->pq.len);
Packet *x;
while ((x = PacketDequeue(&fw->pq))) {
SCLogDebug("packet %"PRIu64" extra packet %p", p->pcap_cnt, x);
// TODO do we need to call StreamTcp on these pseudo packets or not?
//StreamTcp(tv, x, fw->stream_thread, &fw->pq, NULL);
if (detect_thread != NULL) {
FLOWWORKER_PROFILING_START(x, PROFILE_FLOWWORKER_DETECT);
Detect(tv, x, detect_thread, NULL, NULL);
FLOWWORKER_PROFILING_END(x, PROFILE_FLOWWORKER_DETECT);
}
// Outputs
OutputLoggerLog(tv, x, fw->output_thread);
/* put these packets in the preq queue so that they are
* by the other thread modules before packet 'p'. */
PacketEnqueue(preq, x);
}
/* handle the app layer part of the UDP packet payload */
} else if (p->flow && p->proto == IPPROTO_UDP) {
FLOWWORKER_PROFILING_START(p, PROFILE_FLOWWORKER_APPLAYERUDP);
AppLayerHandleUdp(tv, fw->stream_thread->ra_ctx->app_tctx, p, p->flow);
FLOWWORKER_PROFILING_END(p, PROFILE_FLOWWORKER_APPLAYERUDP);
}
/* handle Detect */
DEBUG_ASSERT_FLOW_LOCKED(p->flow);
SCLogDebug("packet %"PRIu64" calling Detect", p->pcap_cnt);
if (detect_thread != NULL) {
FLOWWORKER_PROFILING_START(p, PROFILE_FLOWWORKER_DETECT);
Detect(tv, p, detect_thread, NULL, NULL);
FLOWWORKER_PROFILING_END(p, PROFILE_FLOWWORKER_DETECT);
}
// Outputs.
OutputLoggerLog(tv, p, fw->output_thread);
/* Release tcp segments. Done here after alerting can use them. */
if (p->flow != NULL && p->proto == IPPROTO_TCP) {
FLOWWORKER_PROFILING_START(p, PROFILE_FLOWWORKER_TCPPRUNE);
StreamTcpPruneSession(p->flow, p->flowflags & FLOW_PKT_TOSERVER ?
STREAM_TOSERVER : STREAM_TOCLIENT);
FLOWWORKER_PROFILING_END(p, PROFILE_FLOWWORKER_TCPPRUNE);
}
if (p->flow) {
DEBUG_ASSERT_FLOW_LOCKED(p->flow);
FLOWLOCK_UNLOCK(p->flow);
}
return TM_ECODE_OK;
}
