suricata
flow-timeout.c
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1 /* Copyright (C) 2007-2017 Open Information Security Foundation
2  *
3  * You can copy, redistribute or modify this Program under the terms of
4  * the GNU General Public License version 2 as published by the Free
5  * Software Foundation.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * version 2 along with this program; if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15  * 02110-1301, USA.
16  */
17 
18 /**
19  * \file
20  *
21  * \author Anoop Saldanha <anoopsaldanha@gmail.com>
22  */
23 
24 #include "suricata-common.h"
25 #include "suricata.h"
26 #include "decode.h"
27 #include "conf.h"
28 #include "threadvars.h"
29 #include "tm-threads.h"
30 #include "runmodes.h"
31 
32 #include "util-random.h"
33 #include "util-time.h"
34 
35 #include "flow.h"
36 #include "flow-queue.h"
37 #include "flow-hash.h"
38 #include "flow-util.h"
39 #include "flow-var.h"
40 #include "flow-private.h"
41 #include "flow-manager.h"
42 #include "flow-timeout.h"
43 #include "pkt-var.h"
44 #include "host.h"
45 
46 #include "stream-tcp-private.h"
47 #include "stream-tcp-reassemble.h"
48 #include "stream-tcp.h"
49 
50 #include "util-unittest.h"
51 #include "util-unittest-helper.h"
52 #include "util-byte.h"
53 
54 #include "util-debug.h"
55 #include "util-privs.h"
56 #include "util-datalink.h"
57 
58 #include "detect.h"
59 #include "detect-engine-state.h"
60 #include "stream.h"
61 
62 #include "app-layer-parser.h"
63 #include "app-layer.h"
64 
65 #include "util-profiling.h"
66 
67 /**
68  * \internal
69  * \brief Pseudo packet setup for flow forced reassembly.
70  *
71  * \param direction Direction of the packet. 0 indicates toserver and 1
72  * indicates toclient.
73  * \param f Pointer to the flow.
74  * \param ssn Pointer to the tcp session.
75  * \param dummy Indicates to create a dummy pseudo packet. Not all pseudo
76  * packets need to force reassembly, in which case we just
77  * set dummy ack/seq values.
78  */
79 static inline Packet *FlowForceReassemblyPseudoPacketSetup(
80  Packet *p, int direction, Flow *f, const TcpSession *ssn)
81 {
82  const int orig_dir = direction;
83  p->tenant_id = f->tenant_id;
85  p->proto = IPPROTO_TCP;
86  FlowReference(&p->flow, f);
87  p->flags |= PKT_STREAM_EST;
88  p->flags |= PKT_STREAM_EOF;
89  p->flags |= PKT_HAS_FLOW;
91  memcpy(&p->vlan_id[0], &f->vlan_id[0], sizeof(p->vlan_id));
92  p->vlan_idx = f->vlan_idx;
93  p->livedev = (struct LiveDevice_ *)f->livedev;
94 
96  DecodeSetNoPacketInspectionFlag(p);
97  }
99  DecodeSetNoPayloadInspectionFlag(p);
100  }
101 
102  if (direction == 0)
104  else
107  p->payload = NULL;
108  p->payload_len = 0;
109 
110  /* apply reversed flow logic after setting direction to the packet */
111  direction ^= ((f->flags & FLOW_DIR_REVERSED) != 0);
112 
113  if (FLOW_IS_IPV4(f)) {
114  if (direction == 0) {
117  p->sp = f->sp;
118  p->dp = f->dp;
119  } else {
122  p->sp = f->dp;
123  p->dp = f->sp;
124  }
125 
126  /* Check if we have enough room in direct data. We need ipv4 hdr + tcp hdr.
127  * Force an allocation if it is not the case.
128  */
129  if (GET_PKT_DIRECT_MAX_SIZE(p) < 40) {
130  if (PacketCallocExtPkt(p, 40) == -1) {
131  goto error;
132  }
133  }
134  /* set the ip header */
135  IPV4Hdr *ip4h = PacketSetIPV4(p, GET_PKT_DATA(p));
136  /* version 4 and length 20 bytes for the tcp header */
137  ip4h->ip_verhl = 0x45;
138  ip4h->ip_tos = 0;
139  ip4h->ip_len = htons(40);
140  ip4h->ip_id = 0;
141  ip4h->ip_off = 0;
142  ip4h->ip_ttl = 64;
143  ip4h->ip_proto = IPPROTO_TCP;
144  //p->ip4h->ip_csum =
145  if (direction == 0) {
146  ip4h->s_ip_src.s_addr = f->src.addr_data32[0];
147  ip4h->s_ip_dst.s_addr = f->dst.addr_data32[0];
148  } else {
149  ip4h->s_ip_src.s_addr = f->dst.addr_data32[0];
150  ip4h->s_ip_dst.s_addr = f->src.addr_data32[0];
151  }
152 
153  /* set the tcp header */
154  PacketSetTCP(p, GET_PKT_DATA(p) + 20);
155 
156  SET_PKT_LEN(p, 40); /* ipv4 hdr + tcp hdr */
157 
158  } else if (FLOW_IS_IPV6(f)) {
159  if (direction == 0) {
162  p->sp = f->sp;
163  p->dp = f->dp;
164  } else {
167  p->sp = f->dp;
168  p->dp = f->sp;
169  }
170 
171  /* Check if we have enough room in direct data. We need ipv6 hdr + tcp hdr.
172  * Force an allocation if it is not the case.
173  */
174  if (GET_PKT_DIRECT_MAX_SIZE(p) < 60) {
175  if (PacketCallocExtPkt(p, 60) == -1) {
176  goto error;
177  }
178  }
179  /* set the ip header */
180  IPV6Hdr *ip6h = PacketSetIPV6(p, GET_PKT_DATA(p));
181  /* version 6 */
182  ip6h->s_ip6_vfc = 0x60;
183  ip6h->s_ip6_flow = 0;
184  ip6h->s_ip6_nxt = IPPROTO_TCP;
185  ip6h->s_ip6_plen = htons(20);
186  ip6h->s_ip6_hlim = 64;
187  if (direction == 0) {
188  ip6h->s_ip6_src[0] = f->src.addr_data32[0];
189  ip6h->s_ip6_src[1] = f->src.addr_data32[1];
190  ip6h->s_ip6_src[2] = f->src.addr_data32[2];
191  ip6h->s_ip6_src[3] = f->src.addr_data32[3];
192  ip6h->s_ip6_dst[0] = f->dst.addr_data32[0];
193  ip6h->s_ip6_dst[1] = f->dst.addr_data32[1];
194  ip6h->s_ip6_dst[2] = f->dst.addr_data32[2];
195  ip6h->s_ip6_dst[3] = f->dst.addr_data32[3];
196  } else {
197  ip6h->s_ip6_src[0] = f->dst.addr_data32[0];
198  ip6h->s_ip6_src[1] = f->dst.addr_data32[1];
199  ip6h->s_ip6_src[2] = f->dst.addr_data32[2];
200  ip6h->s_ip6_src[3] = f->dst.addr_data32[3];
201  ip6h->s_ip6_dst[0] = f->src.addr_data32[0];
202  ip6h->s_ip6_dst[1] = f->src.addr_data32[1];
203  ip6h->s_ip6_dst[2] = f->src.addr_data32[2];
204  ip6h->s_ip6_dst[3] = f->src.addr_data32[3];
205  }
206 
207  /* set the tcp header */
208  PacketSetTCP(p, GET_PKT_DATA(p) + 40);
209 
210  SET_PKT_LEN(p, 60); /* ipv6 hdr + tcp hdr */
211  }
212 
213  p->l4.hdrs.tcph->th_offx2 = 0x50;
214  p->l4.hdrs.tcph->th_flags = 0;
215  p->l4.hdrs.tcph->th_win = 10;
216  p->l4.hdrs.tcph->th_urp = 0;
217 
218  /* to server */
219  if (orig_dir == 0) {
220  p->l4.hdrs.tcph->th_sport = htons(f->sp);
221  p->l4.hdrs.tcph->th_dport = htons(f->dp);
222 
223  p->l4.hdrs.tcph->th_seq = htonl(ssn->client.next_seq);
224  p->l4.hdrs.tcph->th_ack = htonl(ssn->server.last_ack);
225 
226  /* to client */
227  } else {
228  p->l4.hdrs.tcph->th_sport = htons(f->dp);
229  p->l4.hdrs.tcph->th_dport = htons(f->sp);
230 
231  p->l4.hdrs.tcph->th_seq = htonl(ssn->server.next_seq);
232  p->l4.hdrs.tcph->th_ack = htonl(ssn->client.last_ack);
233  }
234 
235  if (FLOW_IS_IPV4(f)) {
236  IPV4Hdr *ip4h = p->l3.hdrs.ip4h;
237  p->l4.hdrs.tcph->th_sum = TCPChecksum(ip4h->s_ip_addrs, (uint16_t *)p->l4.hdrs.tcph, 20, 0);
238  /* calc ipv4 csum as we may log it and barnyard might reject
239  * a wrong checksum */
240  ip4h->ip_csum = IPV4Checksum((uint16_t *)ip4h, IPV4_GET_RAW_HLEN(ip4h), 0);
241  } else if (FLOW_IS_IPV6(f)) {
242  const IPV6Hdr *ip6h = PacketGetIPv6(p);
243  p->l4.hdrs.tcph->th_sum =
244  TCPChecksum(ip6h->s_ip6_addrs, (uint16_t *)p->l4.hdrs.tcph, 20, 0);
245  }
246 
247  p->ts = TimeGet();
248 
249  if (direction == 0) {
250  if (f->alparser && !STREAM_HAS_SEEN_DATA(&ssn->client)) {
252  }
253  } else {
254  if (f->alparser && !STREAM_HAS_SEEN_DATA(&ssn->server)) {
256  }
257  }
258 
259  return p;
260 
261 error:
262  FlowDeReference(&p->flow);
263  return NULL;
264 }
265 
267 {
268  PacketPoolWait();
270  if (p == NULL) {
271  return NULL;
272  }
273 
275 
276  return FlowForceReassemblyPseudoPacketSetup(p, direction, f, ssn);
277 }
278 
279 /**
280  * \brief Check if a flow needs forced reassembly, or any other processing
281  *
282  * \param f *LOCKED* flow
283  *
284  * \retval 0 no
285  * \retval 1 yes
286  */
288 {
289 
290  if (f == NULL || f->protoctx == NULL) {
291  SCReturnInt(0);
292  }
293 
294  TcpSession *ssn = (TcpSession *)f->protoctx;
295  uint8_t client = StreamNeedsReassembly(ssn, STREAM_TOSERVER);
296  uint8_t server = StreamNeedsReassembly(ssn, STREAM_TOCLIENT);
297 
298  /* if state is not fully closed we assume that we haven't fully
299  * inspected the app layer state yet */
300  if (ssn->state >= TCP_ESTABLISHED && ssn->state != TCP_CLOSED)
301  {
304  }
305 
306  /* if app layer still needs some love, push through */
307  if (f->alproto != ALPROTO_UNKNOWN && f->alstate != NULL) {
308  const uint64_t total_txs = AppLayerParserGetTxCnt(f, f->alstate);
309 
310  if (AppLayerParserGetTransactionActive(f, f->alparser, STREAM_TOCLIENT) < total_txs)
311  {
313  }
314  if (AppLayerParserGetTransactionActive(f, f->alparser, STREAM_TOSERVER) < total_txs)
315  {
317  }
318  }
319 
320  /* nothing to do */
321  if (client == STREAM_HAS_UNPROCESSED_SEGMENTS_NONE &&
323  SCReturnInt(0);
324  }
325 
326  f->ffr_ts = client;
327  f->ffr_tc = server;
328  SCReturnInt(1);
329 }
330 
331 /**
332  * \internal
333  * \brief Forces reassembly for flow if it needs it.
334  *
335  * The function requires flow to be locked beforehand.
336  *
337  * Normally, the first thread_id value should be used. This is when the flow is
338  * created on seeing the first packet to the server; when the flow's reversed
339  * flag is set, choose the second thread_id (to client/source).
340  *
341  * \param f Pointer to the flow.
342  *
343  * \retval 0 This flow doesn't need any reassembly processing; 1 otherwise.
344  */
346 {
347  // Choose the thread_id based on whether the flow has been
348  // reversed.
349  int idx = f->flags & FLOW_DIR_REVERSED ? 1 : 0;
350  TmThreadsInjectFlowById(f, (const int)f->thread_id[idx]);
351 }
352 
353 /**
354  * \internal
355  * \brief Forces reassembly for flows that need it.
356  *
357  * When this function is called we're running in virtually dead engine,
358  * so locking the flows is not strictly required. The reasons it is still
359  * done are:
360  * - code consistency
361  * - silence complaining profilers
362  * - allow us to aggressively check using debug validation assertions
363  * - be robust in case of future changes
364  * - locking overhead is negligible when no other thread fights us
365  *
366  * \param q The queue to process flows from.
367  */
368 static inline void FlowForceReassemblyForHash(void)
369 {
370  for (uint32_t idx = 0; idx < flow_config.hash_size; idx++) {
371  FlowBucket *fb = &flow_hash[idx];
372  FBLOCK_LOCK(fb);
373 
374  Flow *f = fb->head;
375  Flow *prev_f = NULL;
376 
377  /* we need to loop through all the flows in the queue */
378  while (f != NULL) {
379  Flow *next_f = f->next;
380 
381  FLOWLOCK_WRLOCK(f);
382 
383  /* Get the tcp session for the flow */
384  TcpSession *ssn = (TcpSession *)f->protoctx;
385  /* \todo Also skip flows that shouldn't be inspected */
386  if (ssn == NULL) {
387  FLOWLOCK_UNLOCK(f);
388  prev_f = f;
389  f = next_f;
390  continue;
391  }
392 
393  /* in case of additional work, we pull the flow out of the
394  * hash and xfer ownership to the injected packet(s) */
395  if (FlowForceReassemblyNeedReassembly(f) == 1) {
396  RemoveFromHash(f, prev_f);
399  FLOWLOCK_UNLOCK(f);
400  f = next_f;
401  continue;
402  }
403 
404  FLOWLOCK_UNLOCK(f);
405 
406  /* next flow in the queue */
407  prev_f = f;
408  f = f->next;
409  }
410  FBLOCK_UNLOCK(fb);
411  }
412  return;
413 }
414 
415 /**
416  * \brief Force reassembly for all the flows that have unprocessed segments.
417  */
419 {
420  /* Carry out flow reassembly for unattended flows */
421  FlowForceReassemblyForHash();
422  return;
423 }
Flow_::ffr_tc
uint8_t ffr_tc
Definition: flow.h:388
util-byte.h
host.h
tm-threads.h
Packet_::proto
uint8_t proto
Definition: decode.h:504
TCPHdr_::th_dport
uint16_t th_dport
Definition: decode-tcp.h:151
FlowForceReassemblyForFlow
void FlowForceReassemblyForFlow(Flow *f)
Definition: flow-timeout.c:345
Flow_::ffr_ts
uint8_t ffr_ts
Definition: flow.h:387
FLOW_IS_IPV6
#define FLOW_IS_IPV6(f)
Definition: flow.h:167
PKT_HAS_FLOW
#define PKT_HAS_FLOW
Definition: decode.h:1277
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uint8_t ip_ttl
Definition: decode-ipv4.h:78
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Definition: flow-hash.h:73
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uint32_t hash_size
Definition: flow.h:294
FlowForceReassemblyPseudoPacketGet
Packet * FlowForceReassemblyPseudoPacketGet(int direction, Flow *f, const TcpSession *ssn)
Definition: flow-timeout.c:266
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uint8_t * payload
Definition: decode.h:588
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uint32_t flags
Definition: decode.h:519
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uint8_t vlan_idx
Definition: decode.h:510
flow-private.h
Flow_
Flow data structure.
Definition: flow.h:356
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uint16_t th_win
Definition: decode-tcp.h:156
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Definition: util-device.h:50
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FLOW_NOPAYLOAD_INSPECTION
#define FLOW_NOPAYLOAD_INSPECTION
Definition: flow.h:65
FlowForceReassembly
void FlowForceReassembly(void)
Force reassembly for all the flows that have unprocessed segments.
Definition: flow-timeout.c:418
IPV4Hdr_::ip_id
uint16_t ip_id
Definition: decode-ipv4.h:76
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union PacketL3::Hdrs hdrs
FLOW_PKT_TOSERVER
#define FLOW_PKT_TOSERVER
Definition: flow.h:228
TCP_ESTABLISHED
@ TCP_ESTABLISHED
Definition: stream-tcp-private.h:155
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uint8_t ip_tos
Definition: decode-ipv4.h:74
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stream-tcp-reassemble.h
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Definition: flow.h:372
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Definition: decode.h:513
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Definition: decode.h:420
APP_LAYER_PARSER_EOF_TS
#define APP_LAYER_PARSER_EOF_TS
Definition: app-layer-parser.h:39
Flow_::protoctx
void * protoctx
Definition: flow.h:446
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#define GET_PKT_DIRECT_MAX_SIZE(p)
Definition: decode.h:216
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Definition: decode.h:589
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util-unittest-helper.h
FLOWLOCK_UNLOCK
#define FLOWLOCK_UNLOCK(fb)
Definition: flow.h:273
TmThreadsInjectFlowById
void TmThreadsInjectFlowById(Flow *f, const int id)
inject a flow into a threads flow queue
Definition: tm-threads.c:2299
FLOW_COPY_IPV6_ADDR_TO_PACKET
#define FLOW_COPY_IPV6_ADDR_TO_PACKET(fa, pa)
Definition: flow.h:180
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Definition: decode-tcp.h:153
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int datalink
Definition: decode.h:622
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Definition: stream-tcp-private.h:115
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Definition: flow.h:480
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Definition: flow.h:359
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#define SET_PKT_LEN(p, len)
Definition: decode.h:218
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Definition: decode-tcp.h:150
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Definition: decode-tcp.h:155
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AppLayerParserGetTransactionActive
uint64_t AppLayerParserGetTransactionActive(const Flow *f, AppLayerParserState *pstate, uint8_t direction)
Definition: app-layer-parser.c:1151
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#define STREAM_HAS_SEEN_DATA(stream)
Definition: stream-tcp-private.h:104
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Definition: decode-tcp.h:152
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Definition: decode.h:530
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uint8_t th_offx2
Definition: decode-tcp.h:154
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#define PKT_PSEUDO_STREAM_END
Definition: decode.h:1279
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uint16_t th_sum
Definition: decode-tcp.h:157
FLOWLOCK_WRLOCK
#define FLOWLOCK_WRLOCK(fb)
Definition: flow.h:270
FlowForceReassemblyNeedReassembly
int FlowForceReassemblyNeedReassembly(Flow *f)
Check if a flow needs forced reassembly, or any other processing.
Definition: flow-timeout.c:287
GET_PKT_DATA
#define GET_PKT_DATA(p)
Definition: decode.h:214
STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION
@ STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION
Definition: stream-tcp.h:180
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uint8_t flow_end_flags
Definition: flow.h:452
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Port sp
Definition: decode.h:489
IPV4_GET_RAW_HLEN
#define IPV4_GET_RAW_HLEN(ip4h)
Definition: decode-ipv4.h:96
StreamNeedsReassembly
uint8_t StreamNeedsReassembly(const TcpSession *ssn, uint8_t direction)
see what if any work the TCP session still needs
Definition: stream-tcp-reassemble.c:914
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uint8_t state
Definition: stream-tcp-private.h:285
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uint16_t th_urp
Definition: decode-tcp.h:158
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#define FLOW_IS_IPV4(f)
Definition: flow.h:165
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Definition: decode.c:283
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void PacketPoolWait(void)
Definition: tmqh-packetpool.c:80
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Definition: decode-ipv6.h:32
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Definition: decode.h:482
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Definition: util-time.c:152
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#define APP_LAYER_PARSER_EOF_TC
Definition: app-layer-parser.h:40
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struct PacketL4 l4
Definition: decode.h:584
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Definition: flow-hash.h:75
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struct LiveDevice_ * livedev
Definition: decode.h:601
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#define PKT_STREAM_EOF
Definition: decode.h:1276
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Definition: flow.h:382
detect-engine-state.h
Data structures and function prototypes for keeping state for the detection engine.
flow-timeout.h
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#define FLOW_PKT_TOCLIENT
Definition: flow.h:229
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Definition: flow.h:359
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Definition: flow.h:401
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Definition: decode-ipv4.h:72
TCP_CLOSED
@ TCP_CLOSED
Definition: stream-tcp-private.h:162
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Definition: flow-hash.c:58
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void AppLayerParserStateSetFlag(AppLayerParserState *pstate, uint16_t flag)
Definition: app-layer-parser.c:1789
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struct Flow_ * flow
Definition: decode.h:521
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Definition: decode.h:648
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Definition: flow.c:90
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Definition: stream-tcp-private.h:295
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Definition: flow.h:403
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Definition: util-profiling.h:73
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Definition: stream-tcp-private.h:114
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Definition: decode.h:450
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struct PacketL3 l3
Definition: decode.h:583
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Definition: stream-tcp-private.h:294
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void * alstate
Definition: flow.h:481
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Definition: flow.h:426
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union PacketL4::L4Hdrs hdrs
PacketPoolGetPacket
Packet * PacketPoolGetPacket(void)
Get a new packet from the packet pool.
Definition: tmqh-packetpool.c:127
ALPROTO_UNKNOWN
@ ALPROTO_UNKNOWN
Definition: app-layer-protos.h:29
util-random.h
FLOW_PKT_ESTABLISHED
#define FLOW_PKT_ESTABLISHED
Definition: flow.h:230
IPV4Hdr_::ip_csum
uint16_t ip_csum
Definition: decode-ipv4.h:80
FLOW_END_FLAG_SHUTDOWN
#define FLOW_END_FLAG_SHUTDOWN
Definition: flow.h:245
suricata.h
Packet_::dst
Address dst
Definition: decode.h:487
Flow_::vlan_id
uint16_t vlan_id[VLAN_MAX_LAYERS]
Definition: flow.h:380
Packet_::vlan_id
uint16_t vlan_id[VLAN_MAX_LAYERS]
Definition: decode.h:509
STREAM_HAS_UNPROCESSED_SEGMENTS_NONE
@ STREAM_HAS_UNPROCESSED_SEGMENTS_NONE
Definition: stream-tcp.h:177
FLOW_NOPACKET_INSPECTION
#define FLOW_NOPACKET_INSPECTION
Definition: flow.h:63
IPV4Hdr_::ip_off
uint16_t ip_off
Definition: decode-ipv4.h:77
Flow_::sp
Port sp
Definition: flow.h:361
TcpSession_
Definition: stream-tcp-private.h:283
flow.h
Flow_::alproto
AppProto alproto
application level protocol
Definition: flow.h:455
Packet_::dp
Port dp
Definition: decode.h:497
FLOW_DIR_REVERSED
#define FLOW_DIR_REVERSED
Definition: flow.h:110
IPV4Hdr_::ip_proto
uint8_t ip_proto
Definition: decode-ipv4.h:79
SCReturnInt
#define SCReturnInt(x)
Definition: util-debug.h:275
flow-var.h
AppLayerParserGetTxCnt
uint64_t AppLayerParserGetTxCnt(const Flow *f, void *alstate)
Definition: app-layer-parser.c:1101
IPV4Hdr_::ip_verhl
uint8_t ip_verhl
Definition: decode-ipv4.h:73
Packet_::src
Address src
Definition: decode.h:486
Flow_::tenant_id
uint32_t tenant_id
Definition: flow.h:421
PKT_STREAM_EST
#define PKT_STREAM_EST
Definition: decode.h:1274
Flow_::thread_id
FlowThreadId thread_id[2]
Definition: flow.h:399
app-layer.h
FLOW_COPY_IPV4_ADDR_TO_PACKET
#define FLOW_COPY_IPV4_ADDR_TO_PACKET(fa, pa)
Definition: flow.h:175