suricata
flow-timeout.c
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1 /* Copyright (C) 2007-2024 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-frames.h"
63 #include "app-layer-parser.h"
64 #include "app-layer.h"
65 
66 #include "util-profiling.h"
67 
68 /**
69  * \internal
70  * \brief Pseudo packet setup to finish a flow when needed.
71  *
72  * \param p a dummy pseudo packet from packet pool. Not all pseudo
73  * packets need to force reassembly, in which case we just
74  * set dummy ack/seq values.
75  * \param direction Direction of the packet. 0 indicates toserver and 1
76  * indicates toclient.
77  * \param f Pointer to the flow.
78  * \param ssn Pointer to the tcp session.
79  * \retval pseudo packet with everything set up
80  */
81 static inline Packet *FlowPseudoPacketSetup(
82  Packet *p, int direction, Flow *f, const TcpSession *ssn)
83 {
84  const int orig_dir = direction;
85  p->tenant_id = f->tenant_id;
87  p->proto = IPPROTO_TCP;
88  FlowReference(&p->flow, f);
89  p->flags |= PKT_STREAM_EST;
90  p->flags |= PKT_STREAM_EOF;
91  p->flags |= PKT_HAS_FLOW;
93  memcpy(&p->vlan_id[0], &f->vlan_id[0], sizeof(p->vlan_id));
94  p->vlan_idx = f->vlan_idx;
95  p->livedev = (struct LiveDevice_ *)f->livedev;
96 
98  DecodeSetNoPacketInspectionFlag(p);
99  }
100  if (f->flags & FLOW_NOPAYLOAD_INSPECTION) {
101  DecodeSetNoPayloadInspectionFlag(p);
102  }
103 
104  if (direction == 0)
106  else
109  p->payload = NULL;
110  p->payload_len = 0;
111 
112  /* apply reversed flow logic after setting direction to the packet */
113  direction ^= ((f->flags & FLOW_DIR_REVERSED) != 0);
114 
115  if (FLOW_IS_IPV4(f)) {
116  if (direction == 0) {
119  p->sp = f->sp;
120  p->dp = f->dp;
121  } else {
124  p->sp = f->dp;
125  p->dp = f->sp;
126  }
127 
128  /* Check if we have enough room in direct data. We need ipv4 hdr + tcp hdr.
129  * Force an allocation if it is not the case.
130  */
131  if (GET_PKT_DIRECT_MAX_SIZE(p) < 40) {
132  if (PacketCallocExtPkt(p, 40) == -1) {
133  goto error;
134  }
135  }
136  /* set the ip header */
137  IPV4Hdr *ip4h = PacketSetIPV4(p, GET_PKT_DATA(p));
138  /* version 4 and length 20 bytes for the tcp header */
139  ip4h->ip_verhl = 0x45;
140  ip4h->ip_tos = 0;
141  ip4h->ip_len = htons(40);
142  ip4h->ip_id = 0;
143  ip4h->ip_off = 0;
144  ip4h->ip_ttl = 64;
145  ip4h->ip_proto = IPPROTO_TCP;
146  //p->ip4h->ip_csum =
147  if (direction == 0) {
148  ip4h->s_ip_src.s_addr = f->src.addr_data32[0];
149  ip4h->s_ip_dst.s_addr = f->dst.addr_data32[0];
150  } else {
151  ip4h->s_ip_src.s_addr = f->dst.addr_data32[0];
152  ip4h->s_ip_dst.s_addr = f->src.addr_data32[0];
153  }
154 
155  /* set the tcp header */
156  PacketSetTCP(p, GET_PKT_DATA(p) + 20);
157 
158  SET_PKT_LEN(p, 40); /* ipv4 hdr + tcp hdr */
159 
160  } else if (FLOW_IS_IPV6(f)) {
161  if (direction == 0) {
164  p->sp = f->sp;
165  p->dp = f->dp;
166  } else {
169  p->sp = f->dp;
170  p->dp = f->sp;
171  }
172 
173  /* Check if we have enough room in direct data. We need ipv6 hdr + tcp hdr.
174  * Force an allocation if it is not the case.
175  */
176  if (GET_PKT_DIRECT_MAX_SIZE(p) < 60) {
177  if (PacketCallocExtPkt(p, 60) == -1) {
178  goto error;
179  }
180  }
181  /* set the ip header */
182  IPV6Hdr *ip6h = PacketSetIPV6(p, GET_PKT_DATA(p));
183  /* version 6 */
184  ip6h->s_ip6_vfc = 0x60;
185  ip6h->s_ip6_flow = 0;
186  ip6h->s_ip6_nxt = IPPROTO_TCP;
187  ip6h->s_ip6_plen = htons(20);
188  ip6h->s_ip6_hlim = 64;
189  if (direction == 0) {
190  ip6h->s_ip6_src[0] = f->src.addr_data32[0];
191  ip6h->s_ip6_src[1] = f->src.addr_data32[1];
192  ip6h->s_ip6_src[2] = f->src.addr_data32[2];
193  ip6h->s_ip6_src[3] = f->src.addr_data32[3];
194  ip6h->s_ip6_dst[0] = f->dst.addr_data32[0];
195  ip6h->s_ip6_dst[1] = f->dst.addr_data32[1];
196  ip6h->s_ip6_dst[2] = f->dst.addr_data32[2];
197  ip6h->s_ip6_dst[3] = f->dst.addr_data32[3];
198  } else {
199  ip6h->s_ip6_src[0] = f->dst.addr_data32[0];
200  ip6h->s_ip6_src[1] = f->dst.addr_data32[1];
201  ip6h->s_ip6_src[2] = f->dst.addr_data32[2];
202  ip6h->s_ip6_src[3] = f->dst.addr_data32[3];
203  ip6h->s_ip6_dst[0] = f->src.addr_data32[0];
204  ip6h->s_ip6_dst[1] = f->src.addr_data32[1];
205  ip6h->s_ip6_dst[2] = f->src.addr_data32[2];
206  ip6h->s_ip6_dst[3] = f->src.addr_data32[3];
207  }
208 
209  /* set the tcp header */
210  PacketSetTCP(p, GET_PKT_DATA(p) + 40);
211 
212  SET_PKT_LEN(p, 60); /* ipv6 hdr + tcp hdr */
213  }
214 
215  p->l4.hdrs.tcph->th_offx2 = 0x50;
216  p->l4.hdrs.tcph->th_flags = 0;
217  p->l4.hdrs.tcph->th_win = 10;
218  p->l4.hdrs.tcph->th_urp = 0;
219 
220  /* to server */
221  if (orig_dir == 0) {
222  p->l4.hdrs.tcph->th_sport = htons(f->sp);
223  p->l4.hdrs.tcph->th_dport = htons(f->dp);
224 
225  p->l4.hdrs.tcph->th_seq = htonl(ssn->client.next_seq);
226  p->l4.hdrs.tcph->th_ack = 0;
227 
228  /* to client */
229  } else {
230  p->l4.hdrs.tcph->th_sport = htons(f->dp);
231  p->l4.hdrs.tcph->th_dport = htons(f->sp);
232 
233  p->l4.hdrs.tcph->th_seq = htonl(ssn->server.next_seq);
234  p->l4.hdrs.tcph->th_ack = 0;
235  }
236 
237  if (FLOW_IS_IPV4(f)) {
238  IPV4Hdr *ip4h = p->l3.hdrs.ip4h;
239  p->l4.hdrs.tcph->th_sum = TCPChecksum(ip4h->s_ip_addrs, (uint16_t *)p->l4.hdrs.tcph, 20, 0);
240  /* calc ipv4 csum as we may log it and barnyard might reject
241  * a wrong checksum */
242  ip4h->ip_csum = IPV4Checksum((uint16_t *)ip4h, IPV4_GET_RAW_HLEN(ip4h), 0);
243  } else if (FLOW_IS_IPV6(f)) {
244  const IPV6Hdr *ip6h = PacketGetIPv6(p);
245  p->l4.hdrs.tcph->th_sum =
246  TCPChecksum(ip6h->s_ip6_addrs, (uint16_t *)p->l4.hdrs.tcph, 20, 0);
247  }
248 
249  p->ts = TimeGet();
250 
251  if (direction == 0) {
252  if (f->alparser && !STREAM_HAS_SEEN_DATA(&ssn->client)) {
254  }
255  } else {
256  if (f->alparser && !STREAM_HAS_SEEN_DATA(&ssn->server)) {
258  }
259  }
260 
261  return p;
262 
263 error:
264  FlowDeReference(&p->flow);
265  return NULL;
266 }
267 
268 Packet *FlowPseudoPacketGet(int direction, Flow *f, const TcpSession *ssn)
269 {
270  PacketPoolWait();
272  if (p == NULL) {
273  return NULL;
274  }
275 
277 
278  return FlowPseudoPacketSetup(p, direction, f, ssn);
279 }
280 
281 /**
282  * \brief Check if a flow needs forced reassembly, or any other processing
283  *
284  * \param f *LOCKED* flow
285  *
286  * \retval false no
287  * \retval true yes
288  */
290 {
291  if (f == NULL || f->protoctx == NULL) {
292  return false;
293  }
294 
295  TcpSession *ssn = (TcpSession *)f->protoctx;
296  uint8_t client = StreamNeedsReassembly(ssn, STREAM_TOSERVER);
297  uint8_t server = StreamNeedsReassembly(ssn, STREAM_TOCLIENT);
298 
299  /* if state is not fully closed we assume that we haven't fully
300  * inspected the app layer state yet */
301  if (ssn->state >= TCP_ESTABLISHED && ssn->state != TCP_CLOSED)
302  {
305  }
306 
307  /* if app layer still needs some love, push through */
308  if (f->alproto != ALPROTO_UNKNOWN && f->alstate != NULL) {
309  const uint64_t total_txs = AppLayerParserGetTxCnt(f, f->alstate);
310 
311  if (AppLayerParserGetTransactionActive(f, f->alparser, STREAM_TOCLIENT) < total_txs)
312  {
314  }
315  if (AppLayerParserGetTransactionActive(f, f->alparser, STREAM_TOSERVER) < total_txs)
316  {
318  }
319  }
320 
321  /* if any frame is present we assume it still needs work */
322  FramesContainer *frames_container = AppLayerFramesGetContainer(f);
323  if (frames_container) {
324  if (frames_container->toserver.cnt)
326  if (frames_container->toclient.cnt)
328  }
329 
330  /* nothing to do */
331  if (client == STREAM_HAS_UNPROCESSED_SEGMENTS_NONE &&
333  return false;
334  }
335 
336  f->ffr_ts = client;
337  f->ffr_tc = server;
338  return true;
339 }
340 
341 /**
342  * \internal
343  * \brief Sends the flow to its respective thread's flow queue.
344  *
345  * The function requires flow to be locked beforehand.
346  *
347  * Normally, the first thread_id value should be used. This is when the flow is
348  * created on seeing the first packet to the server; when the flow's reversed
349  * flag is set, choose the second thread_id (to client/source).
350  *
351  * \param f Pointer to the flow.
352  */
354 {
355  // Choose the thread_id based on whether the flow has been
356  // reversed.
357  int idx = f->flags & FLOW_DIR_REVERSED ? 1 : 0;
358  TmThreadsInjectFlowById(f, (const int)f->thread_id[idx]);
359 }
360 
361 /**
362  * \internal
363  * \brief Remove flows from the hash bucket as they have more work to be done in
364  * in the detection engine.
365  *
366  * When this function is called we're running in virtually dead engine,
367  * so locking the flows is not strictly required. The reasons it is still
368  * done are:
369  * - code consistency
370  * - silence complaining profilers
371  * - allow us to aggressively check using debug validation assertions
372  * - be robust in case of future changes
373  * - locking overhead is negligible when no other thread fights us
374  */
375 static inline void FlowRemoveHash(void)
376 {
377  for (uint32_t idx = 0; idx < flow_config.hash_size; idx++) {
378  FlowBucket *fb = &flow_hash[idx];
379  FBLOCK_LOCK(fb);
380 
381  Flow *f = fb->head;
382  Flow *prev_f = NULL;
383 
384  /* we need to loop through all the flows in the queue */
385  while (f != NULL) {
386  Flow *next_f = f->next;
387 
388  FLOWLOCK_WRLOCK(f);
389 
390  /* Get the tcp session for the flow */
391  TcpSession *ssn = (TcpSession *)f->protoctx;
392  /* \todo Also skip flows that shouldn't be inspected */
393  if (ssn == NULL) {
394  FLOWLOCK_UNLOCK(f);
395  prev_f = f;
396  f = next_f;
397  continue;
398  }
399 
400  /* in case of additional work, we pull the flow out of the
401  * hash and xfer ownership to the injected packet(s) */
402  if (FlowNeedsReassembly(f)) {
403  RemoveFromHash(f, prev_f);
406  FLOWLOCK_UNLOCK(f);
407  f = next_f;
408  continue;
409  }
410 
411  FLOWLOCK_UNLOCK(f);
412 
413  /* next flow in the queue */
414  prev_f = f;
415  f = f->next;
416  }
417  FBLOCK_UNLOCK(fb);
418  }
419 }
420 
421 /**
422  * \brief Clean up all the flows that have unprocessed segments and have
423  * some work to do in the detection engine.
424  */
426 {
427  /* Carry out cleanup of unattended flows */
428  FlowRemoveHash();
429 }
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:498
TCPHdr_::th_dport
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Definition: decode-tcp.h:151
Flow_::ffr_ts
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Definition: flow.h:387
FLOW_IS_IPV6
#define FLOW_IS_IPV6(f)
Definition: flow.h:171
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Definition: decode.h:1268
IPV4Hdr_::ip_ttl
uint8_t ip_ttl
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Definition: flow-hash.h:73
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uint32_t hash_size
Definition: flow.h:294
STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION
@ STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION
Definition: stream-tcp.h:191
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Definition: decode.h:574
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Definition: app-layer-frames.h:72
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Definition: decode.h:513
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Definition: flow-timeout.c:353
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Definition: decode.h:504
flow-private.h
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Definition: flow.h:356
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Frames::cnt
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Definition: decode-ipv4.h:76
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union PacketL3::Hdrs hdrs
FLOW_PKT_TOSERVER
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Definition: flow.h:232
TCP_ESTABLISHED
@ TCP_ESTABLISHED
Definition: stream-tcp-private.h:155
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Definition: decode-ipv4.h:74
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Definition: flow-timeout.c:268
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Definition: flow.h:446
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Definition: flow.h:273
STREAM_HAS_UNPROCESSED_SEGMENTS_NONE
@ STREAM_HAS_UNPROCESSED_SEGMENTS_NONE
Definition: stream-tcp.h:188
TmThreadsInjectFlowById
void TmThreadsInjectFlowById(Flow *f, const int id)
inject a flow into a threads flow queue
Definition: tm-threads.c:2305
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Definition: flow.h:184
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Definition: decode-tcp.h:153
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int datalink
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Definition: flow.h:480
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Definition: decode-tcp.h:150
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Definition: app-layer-frames.h:73
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Definition: decode-tcp.h:155
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Definition: app-layer-parser.c:1137
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Definition: stream-tcp-private.h:104
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Definition: decode.h:524
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Definition: decode-tcp.h:157
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#define FLOWLOCK_WRLOCK(fb)
Definition: flow.h:270
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Definition: decode.h:205
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Definition: decode.h:483
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#define IPV4_GET_RAW_HLEN(ip4h)
Definition: decode-ipv4.h:96
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see what if any work the TCP session still needs
Definition: stream-tcp-reassemble.c:978
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uint8_t state
Definition: stream-tcp-private.h:285
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Definition: flow.h:169
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int PacketCallocExtPkt(Packet *p, int datalen)
Definition: decode.c:283
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Definition: tmqh-packetpool.c:80
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Definition: decode-ipv6.h:32
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Definition: decode.h:476
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Definition: app-layer-parser.c:173
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Definition: util-time.c:152
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Definition: app-layer-parser.h:40
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struct PacketL4 l4
Definition: decode.h:570
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Definition: flow-hash.h:75
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Definition: decode.h:587
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Definition: decode.h:1267
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Definition: flow.h:382
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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:233
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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:59
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Definition: app-layer-parser.c:1759
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Definition: decode.h:515
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Definition: decode.h:634
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Definition: flow.h:403
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Definition: stream-tcp-private.h:114
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Definition: decode.h:444
Packet_::l3
struct PacketL3 l3
Definition: decode.h:569
TcpSession_::server
TcpStream server
Definition: stream-tcp-private.h:296
Flow_::alstate
void * alstate
Definition: flow.h:481
Flow_::flags
uint32_t flags
Definition: flow.h:426
PacketL4::hdrs
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:234
IPV4Hdr_::ip_csum
uint16_t ip_csum
Definition: decode-ipv4.h:80
FLOW_END_FLAG_SHUTDOWN
#define FLOW_END_FLAG_SHUTDOWN
Definition: flow.h:246
suricata.h
Packet_::dst
Address dst
Definition: decode.h:481
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:503
FlowNeedsReassembly
bool FlowNeedsReassembly(Flow *f)
Check if a flow needs forced reassembly, or any other processing.
Definition: flow-timeout.c:289
FLOW_NOPACKET_INSPECTION
#define FLOW_NOPACKET_INSPECTION
Definition: flow.h:64
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:491
FLOW_DIR_REVERSED
#define FLOW_DIR_REVERSED
Definition: flow.h:111
IPV4Hdr_::ip_proto
uint8_t ip_proto
Definition: decode-ipv4.h:79
flow-var.h
AppLayerParserGetTxCnt
uint64_t AppLayerParserGetTxCnt(const Flow *f, void *alstate)
Definition: app-layer-parser.c:1087
IPV4Hdr_::ip_verhl
uint8_t ip_verhl
Definition: decode-ipv4.h:73
Packet_::src
Address src
Definition: decode.h:480
Flow_::tenant_id
uint32_t tenant_id
Definition: flow.h:421
PKT_STREAM_EST
#define PKT_STREAM_EST
Definition: decode.h:1265
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:179
FlowWorkToDoCleanup
void FlowWorkToDoCleanup(void)
Clean up all the flows that have unprocessed segments and have some work to do in the detection engin...
Definition: flow-timeout.c:425