23374838686

Committed 21 Mar 2026 07:29AM UTC coverage: 59.341% (-20.0%) from 79.315%

Build # 23374838686

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Pull #15075

github

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web-flow

Commit Message

Merge 90b4e834f into 6587e363a

Pull Request Pull Request #15075: Stack 8001 v16.4

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77.43

/src/flow-timeout.c

/* Copyright (C) 2007-2024 Open Information Security Foundation
 *
 * You can copy, redistribute or modify this Program under the terms of
 * the GNU General Public License version 2 as published by the Free
 * Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

/**
 * \file
 *
 * \author Anoop Saldanha <anoopsaldanha@gmail.com>
 */

#include "suricata-common.h"
#include "suricata.h"
#include "decode.h"
#include "conf.h"
#include "threadvars.h"
#include "tm-threads.h"
#include "runmodes.h"

#include "util-random.h"
#include "util-time.h"

#include "flow.h"
#include "flow-queue.h"
#include "flow-hash.h"
#include "flow-util.h"
#include "flow-var.h"
#include "flow-private.h"
#include "flow-manager.h"
#include "flow-timeout.h"
#include "pkt-var.h"
#include "host.h"

#include "stream-tcp-private.h"
#include "stream-tcp-reassemble.h"
#include "stream-tcp.h"

#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "util-byte.h"

#include "util-debug.h"
#include "util-privs.h"
#include "util-datalink.h"

#include "detect.h"
#include "detect-engine-state.h"
#include "stream.h"

#include "rust.h"
#include "app-layer-frames.h"
#include "app-layer-parser.h"
#include "app-layer.h"

#include "util-profiling.h"

/**
 * \internal
 * \brief Pseudo packet setup to finish a flow when needed.
 *
 * \param p         a dummy pseudo packet from packet pool.  Not all pseudo
 *                  packets need to force reassembly, in which case we just
 *                  set dummy ack/seq values.
 * \param direction Direction of the packet.  0 indicates toserver and 1
 *                  indicates toclient.
 * \param f         Pointer to the flow.
 * \param ssn       Pointer to the tcp session.
 * \retval          pseudo packet with everything set up
 */
static inline Packet *FlowPseudoPacketSetup(
        Packet *p, int direction, Flow *f, const TcpSession *ssn)
{
    const int orig_dir = direction;
    p->tenant_id = f->tenant_id;
    p->datalink = DatalinkGetGlobalType();
    p->proto = IPPROTO_TCP;
    FlowReference(&p->flow, f);
    p->flags |= PKT_STREAM_EST;
    p->flags |= PKT_HAS_FLOW;
    p->flags |= PKT_PSEUDO_STREAM_END;
    memcpy(&p->vlan_id[0], &f->vlan_id[0], sizeof(p->vlan_id));
    p->vlan_idx = f->vlan_idx;
    p->livedev = (struct LiveDevice_ *)f->livedev;

    if (f->flags & FLOW_NOPAYLOAD_INSPECTION) {
        DecodeSetNoPayloadInspectionFlag(p);
    }

    if (direction == 0)
        p->flowflags |= FLOW_PKT_TOSERVER;
    else
        p->flowflags |= FLOW_PKT_TOCLIENT;
    p->flowflags |= FLOW_PKT_ESTABLISHED;
    p->payload = NULL;
    p->payload_len = 0;

    /* apply reversed flow logic after setting direction to the packet */
    direction ^= ((f->flags & FLOW_DIR_REVERSED) != 0);

    if (FLOW_IS_IPV4(f)) {
        if (direction == 0) {
            FLOW_COPY_IPV4_ADDR_TO_PACKET(&f->src, &p->src);
            FLOW_COPY_IPV4_ADDR_TO_PACKET(&f->dst, &p->dst);
            p->sp = f->sp;
            p->dp = f->dp;
        } else {
            FLOW_COPY_IPV4_ADDR_TO_PACKET(&f->src, &p->dst);
            FLOW_COPY_IPV4_ADDR_TO_PACKET(&f->dst, &p->src);
            p->sp = f->dp;
            p->dp = f->sp;
        }

        /* Check if we have enough room in direct data. We need ipv4 hdr + tcp hdr.
         * Force an allocation if it is not the case.
         */
        if (GET_PKT_DIRECT_MAX_SIZE(p) <  40) {
            if (PacketCallocExtPkt(p, 40) == -1) {
                goto error;
            }
        }
        /* set the ip header */
        IPV4Hdr *ip4h = PacketSetIPV4(p, GET_PKT_DATA(p));
        /* version 4 and length 20 bytes for the tcp header */
        ip4h->ip_verhl = 0x45;
        ip4h->ip_tos = 0;
        ip4h->ip_len = htons(40);
        ip4h->ip_id = 0;
        ip4h->ip_off = 0;
        ip4h->ip_ttl = 64;
        ip4h->ip_proto = IPPROTO_TCP;
        //p->ip4h->ip_csum =
        if (direction == 0) {
            ip4h->s_ip_src.s_addr = f->src.addr_data32[0];
            ip4h->s_ip_dst.s_addr = f->dst.addr_data32[0];
        } else {
            ip4h->s_ip_src.s_addr = f->dst.addr_data32[0];
            ip4h->s_ip_dst.s_addr = f->src.addr_data32[0];
        }

        /* set the tcp header */
        PacketSetTCP(p, GET_PKT_DATA(p) + 20);

        SET_PKT_LEN(p, 40); /* ipv4 hdr + tcp hdr */

    } else if (FLOW_IS_IPV6(f)) {
        if (direction == 0) {
            FLOW_COPY_IPV6_ADDR_TO_PACKET(&f->src, &p->src);
            FLOW_COPY_IPV6_ADDR_TO_PACKET(&f->dst, &p->dst);
            p->sp = f->sp;
            p->dp = f->dp;
        } else {
            FLOW_COPY_IPV6_ADDR_TO_PACKET(&f->src, &p->dst);
            FLOW_COPY_IPV6_ADDR_TO_PACKET(&f->dst, &p->src);
            p->sp = f->dp;
            p->dp = f->sp;
        }

        /* Check if we have enough room in direct data. We need ipv6 hdr + tcp hdr.
         * Force an allocation if it is not the case.
         */
        if (GET_PKT_DIRECT_MAX_SIZE(p) <  60) {
            if (PacketCallocExtPkt(p, 60) == -1) {
                goto error;
            }
        }
        /* set the ip header */
        IPV6Hdr *ip6h = PacketSetIPV6(p, GET_PKT_DATA(p));
        /* version 6 */
        ip6h->s_ip6_vfc = 0x60;
        ip6h->s_ip6_flow = 0;
        ip6h->s_ip6_nxt = IPPROTO_TCP;
        ip6h->s_ip6_plen = htons(20);
        ip6h->s_ip6_hlim = 64;
        if (direction == 0) {
            ip6h->s_ip6_src[0] = f->src.addr_data32[0];
            ip6h->s_ip6_src[1] = f->src.addr_data32[1];
            ip6h->s_ip6_src[2] = f->src.addr_data32[2];
            ip6h->s_ip6_src[3] = f->src.addr_data32[3];
            ip6h->s_ip6_dst[0] = f->dst.addr_data32[0];
            ip6h->s_ip6_dst[1] = f->dst.addr_data32[1];
            ip6h->s_ip6_dst[2] = f->dst.addr_data32[2];
            ip6h->s_ip6_dst[3] = f->dst.addr_data32[3];
        } else {
            ip6h->s_ip6_src[0] = f->dst.addr_data32[0];
            ip6h->s_ip6_src[1] = f->dst.addr_data32[1];
            ip6h->s_ip6_src[2] = f->dst.addr_data32[2];
            ip6h->s_ip6_src[3] = f->dst.addr_data32[3];
            ip6h->s_ip6_dst[0] = f->src.addr_data32[0];
            ip6h->s_ip6_dst[1] = f->src.addr_data32[1];
            ip6h->s_ip6_dst[2] = f->src.addr_data32[2];
            ip6h->s_ip6_dst[3] = f->src.addr_data32[3];
        }

        /* set the tcp header */
        PacketSetTCP(p, GET_PKT_DATA(p) + 40);

        SET_PKT_LEN(p, 60); /* ipv6 hdr + tcp hdr */
    }

    p->l4.hdrs.tcph->th_offx2 = 0x50;
    p->l4.hdrs.tcph->th_flags = 0;
    p->l4.hdrs.tcph->th_win = 10;
    p->l4.hdrs.tcph->th_urp = 0;

    /* to server */
    if (orig_dir == 0) {
        p->l4.hdrs.tcph->th_sport = htons(f->sp);
        p->l4.hdrs.tcph->th_dport = htons(f->dp);

        p->l4.hdrs.tcph->th_seq = htonl(ssn->client.next_seq);
        p->l4.hdrs.tcph->th_ack = 0;

        /* to client */
    } else {
        p->l4.hdrs.tcph->th_sport = htons(f->dp);
        p->l4.hdrs.tcph->th_dport = htons(f->sp);

        p->l4.hdrs.tcph->th_seq = htonl(ssn->server.next_seq);
        p->l4.hdrs.tcph->th_ack = 0;
    }

    if (FLOW_IS_IPV4(f)) {
        IPV4Hdr *ip4h = p->l3.hdrs.ip4h;
        p->l4.hdrs.tcph->th_sum = TCPChecksum(ip4h->s_ip_addrs, (uint16_t *)p->l4.hdrs.tcph, 20, 0);
        /* calc ipv4 csum as we may log it and barnyard might reject
         * a wrong checksum */
        ip4h->ip_csum = IPV4Checksum((uint16_t *)ip4h, IPV4_GET_RAW_HLEN(ip4h), 0);
    } else if (FLOW_IS_IPV6(f)) {
        const IPV6Hdr *ip6h = PacketGetIPv6(p);
        p->l4.hdrs.tcph->th_sum =
                TCPChecksum(ip6h->s_ip6_addrs, (uint16_t *)p->l4.hdrs.tcph, 20, 0);
    }

    p->ts = TimeGet();

    if (direction == 0) {
        if (f->alparser && !STREAM_HAS_SEEN_DATA(&ssn->client)) {
            SCAppLayerParserStateSetFlag(f->alparser, APP_LAYER_PARSER_EOF_TS);
        }
    } else {
        if (f->alparser && !STREAM_HAS_SEEN_DATA(&ssn->server)) {
            SCAppLayerParserStateSetFlag(f->alparser, APP_LAYER_PARSER_EOF_TC);
        }
    }

    return p;

error:
    FlowDeReference(&p->flow);
    return NULL;
}

Packet *FlowPseudoPacketGet(int direction, Flow *f, const TcpSession *ssn)
{
    PacketPoolWait();
    Packet *p = PacketPoolGetPacket();
    if (p == NULL) {
        return NULL;
    }

    PACKET_PROFILING_START(p);

    return FlowPseudoPacketSetup(p, direction, f, ssn);
}

/**
 *  \brief Check if a flow needs forced reassembly, or any other processing
 *
 *  \param f *LOCKED* flow
 *
 *  \retval false no
 *  \retval true yes
 */
bool FlowNeedsReassembly(Flow *f)
{
    if (f == NULL || f->protoctx == NULL) {
        return false;
    }

    TcpSession *ssn = (TcpSession *)f->protoctx;
    uint8_t client = StreamNeedsReassembly(ssn, STREAM_TOSERVER);
    uint8_t server = StreamNeedsReassembly(ssn, STREAM_TOCLIENT);

    /* if state is not fully closed we assume that we haven't fully
     * inspected the app layer state yet */
    if (ssn->state >= TCP_ESTABLISHED && ssn->state != TCP_CLOSED)
    {
        client = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;
        server = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;
    }

    /* if app layer still needs some love, push through */
    if (f->alproto != ALPROTO_UNKNOWN && f->alstate != NULL) {
        const uint64_t total_txs = AppLayerParserGetTxCnt(f, f->alstate);

        if (AppLayerParserGetTransactionActive(f, f->alparser, STREAM_TOCLIENT) < total_txs)
        {
            server = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;
        }
        if (AppLayerParserGetTransactionActive(f, f->alparser, STREAM_TOSERVER) < total_txs)
        {
            client = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;
        }
    }

    /* if any frame is present we assume it still needs work */
    FramesContainer *frames_container = AppLayerFramesGetContainer(f);
    if (frames_container) {
        if (frames_container->toserver.cnt)
            client = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;
        if (frames_container->toclient.cnt)
            server = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;
    }

    /* nothing to do */
    if (client == STREAM_HAS_UNPROCESSED_SEGMENTS_NONE &&
        server == STREAM_HAS_UNPROCESSED_SEGMENTS_NONE) {
        return false;
    }

    f->ffr_ts = client;
    f->ffr_tc = server;
    return true;
}

/**
 * \internal
 * \brief Sends the flow to its respective thread's flow queue.
 *
 *        The function requires flow to be locked beforehand.
 *
 * Normally, the first thread_id value should be used. This is when the flow is
 * created on seeing the first packet to the server; when the flow's reversed
 * flag is set, choose the second thread_id (to client/source).
 *
 * \param f Pointer to the flow.
 */
void FlowSendToLocalThread(Flow *f)
{
    // Choose the thread_id based on whether the flow has been
    // reversed.
    int idx = f->flags & FLOW_DIR_REVERSED ? 1 : 0;
    TmThreadsInjectFlowById(f, (const int)f->thread_id[idx]);
}

/**
 * \internal
 * \brief Remove flows from the hash bucket as they have more work to be done in
 *        in the detection engine.
 *
 * When this function is called we're running in virtually dead engine,
 * so locking the flows is not strictly required. The reasons it is still
 * done are:
 * - code consistency
 * - silence complaining profilers
 * - allow us to aggressively check using debug validation assertions
 * - be robust in case of future changes
 * - locking overhead is negligible when no other thread fights us
 */
static inline void FlowRemoveHash(void)
{
    for (uint32_t idx = 0; idx < flow_config.hash_size; idx++) {
        FlowBucket *fb = &flow_hash[idx];
        FBLOCK_LOCK(fb);

        Flow *f = fb->head;
        Flow *prev_f = NULL;

        /* we need to loop through all the flows in the queue */
        while (f != NULL) {
            Flow *next_f = f->next;

            FLOWLOCK_WRLOCK(f);

            /* Get the tcp session for the flow */
            TcpSession *ssn = (TcpSession *)f->protoctx;
            /* \todo Also skip flows that shouldn't be inspected */
            if (ssn == NULL) {
                FLOWLOCK_UNLOCK(f);
                prev_f = f;
                f = next_f;
                continue;
            }

            /* in case of additional work, we pull the flow out of the
             * hash and xfer ownership to the injected packet(s) */
            if (FlowNeedsReassembly(f)) {
                RemoveFromHash(f, prev_f);
                f->flow_end_flags |= FLOW_END_FLAG_SHUTDOWN;
                FlowSendToLocalThread(f);
                FLOWLOCK_UNLOCK(f);
                f = next_f;
                continue;
            }

            FLOWLOCK_UNLOCK(f);

            /* next flow in the queue */
            prev_f = f;
            f = f->next;
        }
        FBLOCK_UNLOCK(fb);
    }
}

/**
 * \brief Clean up all the flows that have unprocessed segments and have
 *        some work to do in the detection engine.
 */
void FlowWorkToDoCleanup(void)
{
    /* Carry out cleanup of unattended flows */
    FlowRemoveHash();
}

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 "rust.h"
63	#include "app-layer-frames.h"
64	#include "app-layer-parser.h"
65	#include "app-layer.h"
66
67	#include "util-profiling.h"
68
69	/**
70	* \internal
71	* \brief Pseudo packet setup to finish a flow when needed.
72	*
73	* \param p a dummy pseudo packet from packet pool. Not all pseudo
74	* packets need to force reassembly, in which case we just
75	* set dummy ack/seq values.
76	* \param direction Direction of the packet. 0 indicates toserver and 1
77	* indicates toclient.
78	* \param f Pointer to the flow.
79	* \param ssn Pointer to the tcp session.
80	* \retval pseudo packet with everything set up
81	*/
82	static inline Packet *FlowPseudoPacketSetup(
83	Packet p, int direction, Flow f, const TcpSession *ssn)
84	{	10,851✔
85	const int orig_dir = direction;	10,851✔
86	p->tenant_id = f->tenant_id;	10,851✔
87	p->datalink = DatalinkGetGlobalType();	10,851✔
88	p->proto = IPPROTO_TCP;	10,851✔
89	FlowReference(&p->flow, f);	10,851✔
90	p->flags \|= PKT_STREAM_EST;	10,851✔
91	p->flags \|= PKT_HAS_FLOW;	10,851✔
92	p->flags \|= PKT_PSEUDO_STREAM_END;	10,851✔
93	memcpy(&p->vlan_id[0], &f->vlan_id[0], sizeof(p->vlan_id));	10,851✔
94	p->vlan_idx = f->vlan_idx;	10,851✔
95	p->livedev = (struct LiveDevice_ *)f->livedev;	10,851✔
96
97	if (f->flags & FLOW_NOPAYLOAD_INSPECTION) {	10,851✔
98	DecodeSetNoPayloadInspectionFlag(p);	70✔
99	}	70✔
100
101	if (direction == 0)	10,851✔
102	p->flowflags \|= FLOW_PKT_TOSERVER;	5,651✔
103	else	5,200✔
104	p->flowflags \|= FLOW_PKT_TOCLIENT;	5,200✔
105	p->flowflags \|= FLOW_PKT_ESTABLISHED;	10,851✔
106	p->payload = NULL;	10,851✔
107	p->payload_len = 0;	10,851✔
108
109	/* apply reversed flow logic after setting direction to the packet */
110	direction ^= ((f->flags & FLOW_DIR_REVERSED) != 0);	10,851✔
111
112	if (FLOW_IS_IPV4(f)) {	10,851✔
113	if (direction == 0) {	10,516✔
114	FLOW_COPY_IPV4_ADDR_TO_PACKET(&f->src, &p->src);	5,540✔
115	FLOW_COPY_IPV4_ADDR_TO_PACKET(&f->dst, &p->dst);	5,540✔
116	p->sp = f->sp;	5,540✔
117	p->dp = f->dp;	5,540✔
118	} else {	5,540✔
119	FLOW_COPY_IPV4_ADDR_TO_PACKET(&f->src, &p->dst);	4,976✔
120	FLOW_COPY_IPV4_ADDR_TO_PACKET(&f->dst, &p->src);	4,976✔
121	p->sp = f->dp;	4,976✔
122	p->dp = f->sp;	4,976✔
123	}	4,976✔
124
125	/* Check if we have enough room in direct data. We need ipv4 hdr + tcp hdr.
126	* Force an allocation if it is not the case.
127	*/
128	if (GET_PKT_DIRECT_MAX_SIZE(p) < 40) {	10,516✔
UNCOV 129	if (PacketCallocExtPkt(p, 40) == -1) {	×
130	goto error;	×
131	}	×
UNCOV 132	}	×
133	/* set the ip header */
134	IPV4Hdr *ip4h = PacketSetIPV4(p, GET_PKT_DATA(p));	10,516✔
135	/* version 4 and length 20 bytes for the tcp header */
136	ip4h->ip_verhl = 0x45;	10,516✔
137	ip4h->ip_tos = 0;	10,516✔
138	ip4h->ip_len = htons(40);	10,516✔
139	ip4h->ip_id = 0;	10,516✔
140	ip4h->ip_off = 0;	10,516✔
141	ip4h->ip_ttl = 64;	10,516✔
142	ip4h->ip_proto = IPPROTO_TCP;	10,516✔
143	//p->ip4h->ip_csum =
144	if (direction == 0) {	10,516✔
145	ip4h->s_ip_src.s_addr = f->src.addr_data32[0];	5,540✔
146	ip4h->s_ip_dst.s_addr = f->dst.addr_data32[0];	5,540✔
147	} else {	5,540✔
148	ip4h->s_ip_src.s_addr = f->dst.addr_data32[0];	4,976✔
149	ip4h->s_ip_dst.s_addr = f->src.addr_data32[0];	4,976✔
150	}	4,976✔
151
152	/* set the tcp header */
153	PacketSetTCP(p, GET_PKT_DATA(p) + 20);	10,516✔
154
155	SET_PKT_LEN(p, 40); /* ipv4 hdr + tcp hdr */	10,516✔
156
157	} else if (FLOW_IS_IPV6(f)) {	10,516✔
158	if (direction == 0) {	335✔
159	FLOW_COPY_IPV6_ADDR_TO_PACKET(&f->src, &p->src);	165✔
160	FLOW_COPY_IPV6_ADDR_TO_PACKET(&f->dst, &p->dst);	165✔
161	p->sp = f->sp;	165✔
162	p->dp = f->dp;	165✔
163	} else {	170✔
164	FLOW_COPY_IPV6_ADDR_TO_PACKET(&f->src, &p->dst);	170✔
165	FLOW_COPY_IPV6_ADDR_TO_PACKET(&f->dst, &p->src);	170✔
166	p->sp = f->dp;	170✔
167	p->dp = f->sp;	170✔
168	}	170✔
169
170	/* Check if we have enough room in direct data. We need ipv6 hdr + tcp hdr.
171	* Force an allocation if it is not the case.
172	*/
173	if (GET_PKT_DIRECT_MAX_SIZE(p) < 60) {	335✔
174	if (PacketCallocExtPkt(p, 60) == -1) {	×
175	goto error;	×
176	}	×
177	}	×
178	/* set the ip header */
179	IPV6Hdr *ip6h = PacketSetIPV6(p, GET_PKT_DATA(p));	335✔
180	/* version 6 */
181	ip6h->s_ip6_vfc = 0x60;	335✔
182	ip6h->s_ip6_flow = 0;	335✔
183	ip6h->s_ip6_nxt = IPPROTO_TCP;	335✔
184	ip6h->s_ip6_plen = htons(20);	335✔
185	ip6h->s_ip6_hlim = 64;	335✔
186	if (direction == 0) {	335✔
187	ip6h->s_ip6_src[0] = f->src.addr_data32[0];	165✔
188	ip6h->s_ip6_src[1] = f->src.addr_data32[1];	165✔
189	ip6h->s_ip6_src[2] = f->src.addr_data32[2];	165✔
190	ip6h->s_ip6_src[3] = f->src.addr_data32[3];	165✔
191	ip6h->s_ip6_dst[0] = f->dst.addr_data32[0];	165✔
192	ip6h->s_ip6_dst[1] = f->dst.addr_data32[1];	165✔
193	ip6h->s_ip6_dst[2] = f->dst.addr_data32[2];	165✔
194	ip6h->s_ip6_dst[3] = f->dst.addr_data32[3];	165✔
195	} else {	170✔
196	ip6h->s_ip6_src[0] = f->dst.addr_data32[0];	170✔
197	ip6h->s_ip6_src[1] = f->dst.addr_data32[1];	170✔
198	ip6h->s_ip6_src[2] = f->dst.addr_data32[2];	170✔
199	ip6h->s_ip6_src[3] = f->dst.addr_data32[3];	170✔
200	ip6h->s_ip6_dst[0] = f->src.addr_data32[0];	170✔
201	ip6h->s_ip6_dst[1] = f->src.addr_data32[1];	170✔
202	ip6h->s_ip6_dst[2] = f->src.addr_data32[2];	170✔
203	ip6h->s_ip6_dst[3] = f->src.addr_data32[3];	170✔
204	}	170✔
205
206	/* set the tcp header */
207	PacketSetTCP(p, GET_PKT_DATA(p) + 40);	335✔
208
209	SET_PKT_LEN(p, 60); /* ipv6 hdr + tcp hdr */	335✔
210	}	335✔
211
212	p->l4.hdrs.tcph->th_offx2 = 0x50;	10,851✔
213	p->l4.hdrs.tcph->th_flags = 0;	10,851✔
214	p->l4.hdrs.tcph->th_win = 10;	10,851✔
215	p->l4.hdrs.tcph->th_urp = 0;	10,851✔
216
217	/* to server */
218	if (orig_dir == 0) {	10,851✔
219	p->l4.hdrs.tcph->th_sport = htons(f->sp);	5,651✔
220	p->l4.hdrs.tcph->th_dport = htons(f->dp);	5,651✔
221
222	p->l4.hdrs.tcph->th_seq = htonl(ssn->client.next_seq);	5,651✔
223	p->l4.hdrs.tcph->th_ack = 0;	5,651✔
224
225	/* to client */
226	} else {	5,651✔
227	p->l4.hdrs.tcph->th_sport = htons(f->dp);	5,200✔
228	p->l4.hdrs.tcph->th_dport = htons(f->sp);	5,200✔
229
230	p->l4.hdrs.tcph->th_seq = htonl(ssn->server.next_seq);	5,200✔
231	p->l4.hdrs.tcph->th_ack = 0;	5,200✔
232	}	5,200✔
233
234	if (FLOW_IS_IPV4(f)) {	10,851✔
235	IPV4Hdr *ip4h = p->l3.hdrs.ip4h;	10,516✔
236	p->l4.hdrs.tcph->th_sum = TCPChecksum(ip4h->s_ip_addrs, (uint16_t *)p->l4.hdrs.tcph, 20, 0);	10,516✔
237	/* calc ipv4 csum as we may log it and barnyard might reject
238	* a wrong checksum */
239	ip4h->ip_csum = IPV4Checksum((uint16_t *)ip4h, IPV4_GET_RAW_HLEN(ip4h), 0);	10,516✔
240	} else if (FLOW_IS_IPV6(f)) {	10,516✔
241	const IPV6Hdr *ip6h = PacketGetIPv6(p);	335✔
242	p->l4.hdrs.tcph->th_sum =	335✔
243	TCPChecksum(ip6h->s_ip6_addrs, (uint16_t *)p->l4.hdrs.tcph, 20, 0);	335✔
244	}	335✔
245
246	p->ts = TimeGet();	10,851✔
247
248	if (direction == 0) {	10,851✔
249	if (f->alparser && !STREAM_HAS_SEEN_DATA(&ssn->client)) {	5,705✔
250	SCAppLayerParserStateSetFlag(f->alparser, APP_LAYER_PARSER_EOF_TS);	294✔
251	}	294✔
252	} else {	5,705✔
253	if (f->alparser && !STREAM_HAS_SEEN_DATA(&ssn->server)) {	5,146✔
254	SCAppLayerParserStateSetFlag(f->alparser, APP_LAYER_PARSER_EOF_TC);	765✔
255	}	765✔
256	}	5,146✔
257
258	return p;	10,851✔
259
260	error:	×
261	FlowDeReference(&p->flow);	×
262	return NULL;	×
263	}	10,851✔
264
265	Packet FlowPseudoPacketGet(int direction, Flow f, const TcpSession *ssn)
266	{	10,851✔
267	PacketPoolWait();	10,851✔
268	Packet *p = PacketPoolGetPacket();	10,851✔
269	if (p == NULL) {	10,851✔
270	return NULL;	×
271	}	×
272
273	PACKET_PROFILING_START(p);	10,851✔
274
275	return FlowPseudoPacketSetup(p, direction, f, ssn);	10,851✔
276	}	10,851✔
277
278	/**
279	* \brief Check if a flow needs forced reassembly, or any other processing
280	*
281	* \param f LOCKED flow
282	*
283	* \retval false no
284	* \retval true yes
285	*/
286	bool FlowNeedsReassembly(Flow *f)
287	{	6,997✔
288	if (f == NULL \|\| f->protoctx == NULL) {	6,997✔
289	return false;	53✔
290	}	53✔
291
292	TcpSession ssn = (TcpSession )f->protoctx;	6,944✔
293	uint8_t client = StreamNeedsReassembly(ssn, STREAM_TOSERVER);	6,944✔
294	uint8_t server = StreamNeedsReassembly(ssn, STREAM_TOCLIENT);	6,944✔
295
296	/* if state is not fully closed we assume that we haven't fully
297	* inspected the app layer state yet */
298	if (ssn->state >= TCP_ESTABLISHED && ssn->state != TCP_CLOSED)	6,944✔
299	{	4,918✔
300	client = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;	4,918✔
301	server = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;	4,918✔
302	}	4,918✔
303
304	/* if app layer still needs some love, push through */
305	if (f->alproto != ALPROTO_UNKNOWN && f->alstate != NULL) {	6,944✔
306	const uint64_t total_txs = AppLayerParserGetTxCnt(f, f->alstate);	3,218✔
307
308	if (AppLayerParserGetTransactionActive(f, f->alparser, STREAM_TOCLIENT) < total_txs)	3,218✔
309	{	2,068✔
310	server = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;	2,068✔
311	}	2,068✔
312	if (AppLayerParserGetTransactionActive(f, f->alparser, STREAM_TOSERVER) < total_txs)	3,218✔
313	{	1,918✔
314	client = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;	1,918✔
315	}	1,918✔
316	}	3,218✔
317
318	/* if any frame is present we assume it still needs work */
319	FramesContainer *frames_container = AppLayerFramesGetContainer(f);	6,944✔
320	if (frames_container) {	6,944✔
321	if (frames_container->toserver.cnt)	2,646✔
322	client = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;	1,556✔
323	if (frames_container->toclient.cnt)	2,646✔
324	server = STREAM_HAS_UNPROCESSED_SEGMENTS_NEED_ONLY_DETECTION;	1,411✔
325	}	2,646✔
326
327	/* nothing to do */
328	if (client == STREAM_HAS_UNPROCESSED_SEGMENTS_NONE &&	6,944✔
329	server == STREAM_HAS_UNPROCESSED_SEGMENTS_NONE) {	6,944✔
330	return false;	1,229✔
331	}	1,229✔
332
333	f->ffr_ts = client;	5,715✔
334	f->ffr_tc = server;	5,715✔
335	return true;	5,715✔
336	}	6,944✔
337
338	/**
339	* \internal
340	* \brief Sends the flow to its respective thread's flow queue.
341	*
342	* The function requires flow to be locked beforehand.
343	*
344	* Normally, the first thread_id value should be used. This is when the flow is
345	* created on seeing the first packet to the server; when the flow's reversed
346	* flag is set, choose the second thread_id (to client/source).
347	*
348	* \param f Pointer to the flow.
349	*/
350	void FlowSendToLocalThread(Flow *f)
UNCOV 351	{	×
352	// Choose the thread_id based on whether the flow has been
353	// reversed.
UNCOV 354	int idx = f->flags & FLOW_DIR_REVERSED ? 1 : 0;	×
UNCOV 355	TmThreadsInjectFlowById(f, (const int)f->thread_id[idx]);	×
UNCOV 356	}	×
357
358	/**
359	* \internal
360	* \brief Remove flows from the hash bucket as they have more work to be done in
361	* in the detection engine.
362	*
363	* When this function is called we're running in virtually dead engine,
364	* so locking the flows is not strictly required. The reasons it is still
365	* done are:
366	* - code consistency
367	* - silence complaining profilers
368	* - allow us to aggressively check using debug validation assertions
369	* - be robust in case of future changes
370	* - locking overhead is negligible when no other thread fights us
371	*/
372	static inline void FlowRemoveHash(void)
UNCOV 373	{	×
UNCOV 374	for (uint32_t idx = 0; idx < flow_config.hash_size; idx++) {	×
UNCOV 375	FlowBucket *fb = &flow_hash[idx];	×
UNCOV 376	FBLOCK_LOCK(fb);	×
377
UNCOV 378	Flow *f = fb->head;	×
UNCOV 379	Flow *prev_f = NULL;	×
380
381	/* we need to loop through all the flows in the queue */
UNCOV 382	while (f != NULL) {	×
UNCOV 383	Flow *next_f = f->next;	×
384
UNCOV 385	FLOWLOCK_WRLOCK(f);	×
386
387	/* Get the tcp session for the flow */
UNCOV 388	TcpSession ssn = (TcpSession )f->protoctx;	×
389	/* \todo Also skip flows that shouldn't be inspected */
UNCOV 390	if (ssn == NULL) {	×
UNCOV 391	FLOWLOCK_UNLOCK(f);	×
UNCOV 392	prev_f = f;	×
UNCOV 393	f = next_f;	×
UNCOV 394	continue;	×
UNCOV 395	}	×
396
397	/* in case of additional work, we pull the flow out of the
398	* hash and xfer ownership to the injected packet(s) */
UNCOV 399	if (FlowNeedsReassembly(f)) {	×
UNCOV 400	RemoveFromHash(f, prev_f);	×
UNCOV 401	f->flow_end_flags \|= FLOW_END_FLAG_SHUTDOWN;	×
UNCOV 402	FlowSendToLocalThread(f);	×
UNCOV 403	FLOWLOCK_UNLOCK(f);	×
UNCOV 404	f = next_f;	×
UNCOV 405	continue;	×
UNCOV 406	}	×
407
UNCOV 408	FLOWLOCK_UNLOCK(f);	×
409
410	/* next flow in the queue */
UNCOV 411	prev_f = f;	×
UNCOV 412	f = f->next;	×
UNCOV 413	}	×
UNCOV 414	FBLOCK_UNLOCK(fb);	×
UNCOV 415	}	×
UNCOV 416	}	×
417
418	/**
419	* \brief Clean up all the flows that have unprocessed segments and have
420	* some work to do in the detection engine.
421	*/
422	void FlowWorkToDoCleanup(void)
UNCOV 423	{	×
424	/* Carry out cleanup of unattended flows */
UNCOV 425	FlowRemoveHash();	×
UNCOV 426	}	×

OISF / suricata / 23374838686

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