flow.c File Reference

#include "suricata-common.h"
#include "suricata.h"
#include "action-globals.h"
#include "packet.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-timeout.h"
#include "flow-manager.h"
#include "flow-storage.h"
#include "flow-bypass.h"
#include "flow-spare-pool.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-misc.h"
#include "util-macset.h"
#include "util-debug.h"
#include "util-privs.h"
#include "util-validate.h"
#include "detect.h"
#include "detect-engine-state.h"
#include "stream.h"
#include "app-layer-parser.h"
#include "app-layer-expectation.h"
#include "threads.h"

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Macros
#define	FLOW_DEFAULT_EMERGENCY_RECOVERY   30
#define	FLOW_DEFAULT_HASHSIZE   65536
#define	FLOW_DEFAULT_MEMCAP   (32 * 1024 * 1024) /* 32 MB */
#define	FLOW_DEFAULT_PREALLOC   10000
#define	SET_DEFAULTS(p, n, e, c, b, ne, ee, ce, be)

Functions
	SC_ATOMIC_DECLARE (FlowProtoTimeoutPtr, flow_timeouts)
	SC_ATOMIC_DECLARE (unsigned int, flow_prune_idx)
	SC_ATOMIC_DECLARE (unsigned int, flow_flags)
	SC_ATOMIC_DECLARE (uint64_t, flow_memuse)
void	FlowRegisterTests (void)
	Function to register the Flow Unitests. More...
void	FlowInitFlowProto (void)
	Function to set the default timeout, free function and flow state function for all supported flow_proto. More...
int	FlowSetProtoFreeFunc (uint8_t proto, void(*Free)(void *))
	Function to set the function to get protocol specific flow state. More...
int	FlowSetMemcap (uint64_t size)
	Update memcap value. More...
uint64_t	FlowGetMemcap (void)
	Return memcap value. More...
uint64_t	FlowGetMemuse (void)
enum ExceptionPolicy	FlowGetMemcapExceptionPolicy (void)
void	FlowCleanupAppLayer (Flow *f)
void	FlowSetIPOnlyFlag (Flow *f, int direction)
	Set the IPOnly scanned flag for 'direction'. More...
void	FlowSetHasAlertsFlag (Flow *f)
	Set flag to indicate that flow has alerts. More...
int	FlowHasAlerts (const Flow *f)
	Check if flow has alerts. More...
void	FlowSetChangeProtoFlag (Flow *f)
	Set flag to indicate to change proto for the flow. More...
void	FlowUnsetChangeProtoFlag (Flow *f)
	Unset flag to indicate to change proto for the flow. More...
int	FlowChangeProto (Flow *f)
	Check if change proto flag is set for flow. More...
void	FlowSwap (Flow *f)
	swap the flow's direction More...
int	FlowGetPacketDirection (const Flow *f, const Packet *p)
	determine the direction of the packet compared to the flow More...
void	FlowHandlePacketUpdate (Flow *f, Packet *p, ThreadVars *tv, DecodeThreadVars *dtv)
	Update Packet and Flow. More...
void	FlowHandlePacket (ThreadVars *tv, FlowLookupStruct *fls, Packet *p)
	Entry point for packet flow handling. More...
void	FlowInitConfig (bool quiet)
	initialize the configuration More...
void	FlowReset (void)
void	FlowShutdown (void)
	shutdown the flow engine More...
int	FlowClearMemory (Flow *f, uint8_t proto_map)
	Function clear the flow memory before queueing it to spare flow queue. More...
uint8_t	FlowGetDisruptionFlags (const Flow *f, uint8_t flags)
	get 'disruption' flags: GAP/DEPTH/PASS More...
void	FlowUpdateState (Flow *f, const enum FlowState s)
void	FlowGetLastTimeAsParts (Flow *flow, uint64_t *secs, uint64_t *usecs)
	Get flow last time as individual values. More...
uint16_t	FlowGetSourcePort (Flow *flow)
	Get flow source port. More...
uint16_t	FlowGetDestinationPort (Flow *flow)
	Get flow destination port. More...
uint32_t	FlowGetFlags (Flow *flow)
	Get flow flags. More...

Variables
FlowProtoTimeout	flow_timeouts_normal [FLOW_PROTO_MAX]
FlowProtoTimeout	flow_timeouts_emerg [FLOW_PROTO_MAX]
FlowProtoTimeout	flow_timeouts_delta [FLOW_PROTO_MAX]
FlowProtoFreeFunc	flow_freefuncs [FLOW_PROTO_MAX]
FlowConfig	flow_config
int	run_mode

Detailed Description

Author

Victor Julien victo.nosp@m.r@in.nosp@m.linia.nosp@m.c.ne.nosp@m.t

Flow implementation.

Definition in file flow.c.

Macro Definition Documentation

FLOW_DEFAULT_EMERGENCY_RECOVERY

#define FLOW_DEFAULT_EMERGENCY_RECOVERY   30

Definition at line 74 of file flow.c.

FLOW_DEFAULT_HASHSIZE

#define FLOW_DEFAULT_HASHSIZE   65536

Definition at line 77 of file flow.c.

FLOW_DEFAULT_MEMCAP

#define FLOW_DEFAULT_MEMCAP   (32 * 1024 * 1024) /* 32 MB */

Definition at line 79 of file flow.c.

FLOW_DEFAULT_PREALLOC

#define FLOW_DEFAULT_PREALLOC   10000

Definition at line 81 of file flow.c.

SET_DEFAULTS

#define SET_DEFAULTS	(		p,
			n,
			e,
			c,
			b,
			ne,
			ee,
			ce,
			be
	)

Value:

    flow_timeouts_normal[(p)].new_timeout = (n);     \
    flow_timeouts_normal[(p)].est_timeout = (e);     \
    flow_timeouts_normal[(p)].closed_timeout = (c);  \
    flow_timeouts_normal[(p)].bypassed_timeout = (b); \
    flow_timeouts_emerg[(p)].new_timeout = (ne);     \
    flow_timeouts_emerg[(p)].est_timeout = (ee);     \
    flow_timeouts_emerg[(p)].closed_timeout = (ce); \
    flow_timeouts_emerg[(p)].bypassed_timeout = (be); \

Function Documentation

FlowChangeProto()

int FlowChangeProto

(

Flow *

f

)

Check if change proto flag is set for flow.

Parameters

f

flow

Return values

1	change proto flag is set
0	change proto flag is not set

Definition at line 221 of file flow.c.

References Flow_::flags, and FLOW_CHANGE_PROTO.

Referenced by AppLayerRequestProtocolChange(), and LLVMFuzzerTestOneInput().

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FlowCleanupAppLayer()

void FlowCleanupAppLayer

(

Flow *

f

)

Definition at line 151 of file flow.c.

References Flow_::alparser, Flow_::alstate, AppLayerParserStateCleanup(), and Flow_::proto.

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FlowClearMemory()

int FlowClearMemory	(	Flow *	f,
		uint8_t	proto_map
	)

Function clear the flow memory before queueing it to spare flow queue.

Parameters

f	pointer to the flow needed to be cleared.
proto_map	mapped value of the protocol to FLOW_PROTO's.

Definition at line 1103 of file flow.c.

References AppLayerExpectationClean(), Flow_::flags, flow_freefuncs, FLOW_HAS_EXPECTATION, FLOW_RECYCLE, FlowFreeStorage(), FlowProtoFreeFunc_::Freefunc, Flow_::protoctx, SCEnter, SCReturnInt, and unlikely.

Referenced by FlowReset(), and FlowShutdown().

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FlowGetDestinationPort()

uint16_t FlowGetDestinationPort

(

Flow *

flow

)

Get flow destination port.

A function to get the flow dport useful when the caller only has an opaque pointer to the flow structure.

Definition at line 1226 of file flow.c.

References Flow_::dp.

FlowGetDisruptionFlags()

uint8_t FlowGetDisruptionFlags	(	const Flow *	f,
		uint8_t	flags
	)

get 'disruption' flags: GAP/DEPTH/PASS

Parameters

f	locked flow
flags	existing flags to be amended

Return values

flags

original flags + disrupt flags (if any) \TODO handle UDP

Definition at line 1147 of file flow.c.

References TcpSession_::client, flags, TcpStream_::flags, Flow_::proto, Flow_::protoctx, TcpSession_::server, and STREAMTCP_STREAM_FLAG_DEPTH_REACHED.

FlowGetFlags()

uint32_t FlowGetFlags

(

Flow *

flow

)

Get flow flags.

A function to get the flow flags useful when the caller only has an opaque pointer to the flow structure.

Definition at line 1237 of file flow.c.

References Flow_::flags.

FlowGetLastTimeAsParts()

void FlowGetLastTimeAsParts	(	Flow *	flow,
		uint64_t *	secs,
		uint64_t *	usecs
	)

Get flow last time as individual values.

Instead of returning a pointer to the timeval copy the timeval parts into output pointers to make it simpler to call from Rust over FFI using only basic data types.

Definition at line 1202 of file flow.c.

References Flow_::lastts, SCTIME_SECS, and SCTIME_USECS.

FlowGetMemcap()

uint64_t FlowGetMemcap

(

void

)

Return memcap value.

Return values

memcap

value

Definition at line 134 of file flow.c.

References flow_config, and SC_ATOMIC_GET.

FlowGetMemcapExceptionPolicy()

enum ExceptionPolicy FlowGetMemcapExceptionPolicy

(

void

)

Definition at line 140 of file flow.c.

Referenced by DecodeRegisterPerfCounters().

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FlowGetMemuse()

uint64_t FlowGetMemuse

(

void

)

Definition at line 140 of file flow.c.

References SC_ATOMIC_GET.

FlowGetPacketDirection()

int FlowGetPacketDirection	(	const Flow *	f,
		const Packet *	p
	)

determine the direction of the packet compared to the flow

Return values

0	to_server
1	to_client

Definition at line 305 of file flow.c.

References CMP_ADDR, CMP_PORT, Packet_::dp, Flow_::flags, FLOW_DIR_REVERSED, IPPROTO_SCTP, Packet_::proto, Flow_::sp, Packet_::sp, Flow_::src, Packet_::src, TOCLIENT, and TOSERVER.

Referenced by FlowHandlePacketUpdate(), and StreamTcp().

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FlowGetSourcePort()

uint16_t FlowGetSourcePort

(

Flow *

flow

)

Get flow source port.

A function to get the flow sport useful when the caller only has an opaque pointer to the flow structure.

Definition at line 1214 of file flow.c.

References Flow_::sp.

FlowHandlePacket()

void FlowHandlePacket	(	ThreadVars *	tv,
		FlowLookupStruct *	fls,
		Packet *	p
	)

Entry point for packet flow handling.

This is called for every packet.

Parameters

tv	threadvars
dtv	decode thread vars (for flow output api thread data)
p	packet to handle flow for

Definition at line 523 of file flow.c.

References Packet_::flags, Packet_::flow, FlowGetFlowFromHash(), PKT_HAS_FLOW, and tv.

Referenced by UTHBuildPacketOfFlows().

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FlowHandlePacketUpdate()

void FlowHandlePacketUpdate	(	Flow *	f,
		Packet *	p,
		ThreadVars *	tv,
		DecodeThreadVars *	dtv
	)

Update Packet and Flow.

Updates packet and flow based on the new packet.

Parameters

f	locked flow
p	packet

Note

overwrites p::flowflags

Definition at line 403 of file flow.c.

References BypassedFlowUpdate(), EngineModeIsIPS(), Flow_::flags, FLOW_BYPASSED_TIMEOUT, FLOW_PKT_TOSERVER, Flow_::flow_state, FLOW_STATE_LOCAL_BYPASSED, FLOW_TO_DST_SEEN, Packet_::flowflags, FlowGetPacketDirection(), FlowUpdateState(), GET_PKT_LEN, Flow_::lastts, Packet_::pcap_cnt, SCLogDebug, SCTIME_CMP_GT, SCTIME_SECS, Flow_::timeout_at, Flow_::timeout_policy, Flow_::todstbytecnt, Flow_::todstpktcnt, TOSERVER, and Packet_::ts.

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FlowHasAlerts()

int FlowHasAlerts

(

const Flow *

f

)

Check if flow has alerts.

Parameters

f

flow

Return values

1	has alerts
0	has not alerts

Definition at line 189 of file flow.c.

References Flow_::flags, and FLOW_HAS_ALERTS.

FlowInitConfig()

void FlowInitConfig

(

bool

quiet

)

initialize the configuration

Warning

Not thread safe

set config values for memcap, prealloc and hash_size

Definition at line 537 of file flow.c.

References CLS, ConfGet(), ConfGetInt(), FlowCnf_::emergency_recovery, ExceptionPolicyParse(), FatalError, FBLOCK_INIT, FLOW_CHECK_MEMCAP, flow_config, FLOW_DEFAULT_EMERGENCY_RECOVERY, FLOW_DEFAULT_HASHSIZE, FLOW_DEFAULT_MEMCAP, FLOW_DEFAULT_PREALLOC, flow_hash, flow_recycle_q, FlowInitFlowProto(), FlowQueueInit(), FlowSparePoolInit(), FlowStorageSize(), FlowCnf_::hash_rand, FlowCnf_::hash_size, FlowCnf_::memcap_policy, ParseSizeStringU64(), FlowCnf_::prealloc, RandomGet(), SC_ATOMIC_ADD, SC_ATOMIC_GET, SC_ATOMIC_INIT, SC_ATOMIC_SET, SCLogDebug, SCLogError, SCMallocAligned, StringParseUint32(), and unlikely.

Referenced by PreRunInit().

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FlowInitFlowProto()

void FlowInitFlowProto

(

void

)

Function to set the default timeout, free function and flow state function for all supported flow_proto.

Definition at line 729 of file flow.c.

References FlowProtoTimeout_::bypassed_timeout, FlowProtoTimeout_::closed_timeout, ConfGetNode(), ConfNodeLookupChild(), ConfNodeLookupChildValue(), FlowProtoTimeout_::est_timeout, FLOW_DEFAULT_BYPASSED_TIMEOUT, FLOW_DEFAULT_EMERG_BYPASSED_TIMEOUT, FLOW_DEFAULT_EMERG_EST_TIMEOUT, FLOW_DEFAULT_EMERG_NEW_TIMEOUT, FLOW_DEFAULT_EST_TIMEOUT, FLOW_DEFAULT_NEW_TIMEOUT, flow_freefuncs, FLOW_IPPROTO_ICMP_BYPASSED_TIMEOUT, FLOW_IPPROTO_ICMP_EMERG_EST_TIMEOUT, FLOW_IPPROTO_ICMP_EMERG_NEW_TIMEOUT, FLOW_IPPROTO_ICMP_EST_TIMEOUT, FLOW_IPPROTO_ICMP_NEW_TIMEOUT, FLOW_IPPROTO_TCP_BYPASSED_TIMEOUT, FLOW_IPPROTO_TCP_CLOSED_TIMEOUT, FLOW_IPPROTO_TCP_EMERG_CLOSED_TIMEOUT, FLOW_IPPROTO_TCP_EMERG_EST_TIMEOUT, FLOW_IPPROTO_TCP_EMERG_NEW_TIMEOUT, FLOW_IPPROTO_TCP_EST_TIMEOUT, FLOW_IPPROTO_TCP_NEW_TIMEOUT, FLOW_IPPROTO_UDP_BYPASSED_TIMEOUT, FLOW_IPPROTO_UDP_EMERG_EST_TIMEOUT, FLOW_IPPROTO_UDP_EMERG_NEW_TIMEOUT, FLOW_IPPROTO_UDP_EST_TIMEOUT, FLOW_IPPROTO_UDP_NEW_TIMEOUT, FLOW_PROTO_DEFAULT, FLOW_PROTO_ICMP, FLOW_PROTO_MAX, FLOW_PROTO_TCP, FLOW_PROTO_UDP, flow_timeouts_delta, flow_timeouts_emerg, flow_timeouts_normal, FlowTimeoutsInit(), FlowProtoFreeFunc_::Freefunc, FlowProtoTimeout_::new_timeout, proto, SCLogDebug, SCLogWarning, SET_DEFAULTS, and StringParseUint32().

Referenced by FlowInitConfig().

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FlowRegisterTests()

void FlowRegisterTests

(

void

)

Function to register the Flow Unitests.

Definition at line 1454 of file flow.c.

References UtRegisterTest().

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FlowReset()

void FlowReset

(

void

)

Definition at line 667 of file flow.c.

References flow_config, flow_hash, FlowClearMemory(), FlowFree(), FlowGetProtoMapping(), FlowCnf_::hash_size, Flow_::next, and Flow_::proto.

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FlowSetChangeProtoFlag()

void FlowSetChangeProtoFlag

(

Flow *

f

)

Set flag to indicate to change proto for the flow.

Parameters

f

flow

Definition at line 202 of file flow.c.

References Flow_::flags, and FLOW_CHANGE_PROTO.

Referenced by AppLayerRequestProtocolChange().

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FlowSetHasAlertsFlag()

void FlowSetHasAlertsFlag

(

Flow *

f

)

Set flag to indicate that flow has alerts.

Parameters

f

flow

Definition at line 178 of file flow.c.

References Flow_::flags, and FLOW_HAS_ALERTS.

FlowSetIPOnlyFlag()

void FlowSetIPOnlyFlag	(	Flow *	f,
		int	direction
	)

Set the IPOnly scanned flag for 'direction'.

Parameters

f	Flow to set the flag in
direction	direction to set the flag in

Definition at line 167 of file flow.c.

References Flow_::flags, FLOW_TOCLIENT_IPONLY_SET, and FLOW_TOSERVER_IPONLY_SET.

FlowSetMemcap()

int FlowSetMemcap

(

uint64_t

size

)

Update memcap value.

Parameters

size	new memcap value

Definition at line 119 of file flow.c.

References flow_config, SC_ATOMIC_GET, and SC_ATOMIC_SET.

FlowSetProtoFreeFunc()

int FlowSetProtoFreeFunc	(	uint8_t	proto,
		void(*)(void *)	Free
	)

Function to set the function to get protocol specific flow state.

Parameters

proto	protocol of which function is needed to be set.
Free	Function pointer which will be called to free the protocol specific memory.

Definition at line 1131 of file flow.c.

References flow_freefuncs, FlowGetProtoMapping(), FlowProtoFreeFunc_::Freefunc, and proto.

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FlowShutdown()

void FlowShutdown

(

void

)

shutdown the flow engine

Warning

Not thread safe

Definition at line 685 of file flow.c.

References FBLOCK_DESTROY, flow_config, flow_hash, flow_recycle_q, FlowClearMemory(), FlowDequeue(), FlowFree(), FlowGetProtoMapping(), FlowQueueDestroy(), FlowSparePoolDestroy(), FlowCnf_::hash_size, Flow_::next, Flow_::proto, SC_ATOMIC_SUB, and SCFreeAligned.

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FlowSwap()

void FlowSwap

(

Flow *

f

)

swap the flow's direction

Note

leaves the 'header' untouched. Interpret that based on FLOW_DIR_REVERSED flag.

Warning

: only valid before applayer parsing started. This function doesn't swap anything in Flow::alparser, Flow::alstate

Definition at line 272 of file flow.c.

References Flow_::flags, FLOW_DIR_REVERSED, Flow_::probing_parser_toclient_alproto_masks, Flow_::probing_parser_toserver_alproto_masks, and SWAP_VARS.

FlowUnsetChangeProtoFlag()

void FlowUnsetChangeProtoFlag

(

Flow *

f

)

Unset flag to indicate to change proto for the flow.

Parameters

f

flow

Definition at line 211 of file flow.c.

References Flow_::flags, and FLOW_CHANGE_PROTO.

FlowUpdateState()

void FlowUpdateState	(	Flow *	f,
		const enum FlowState	s
	)

Definition at line 1168 of file flow.c.

References Flow_::flow_state.

Referenced by FlowHandlePacketUpdate(), and PacketBypassCallback().

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SC_ATOMIC_DECLARE() [1/4]

SC_ATOMIC_DECLARE	(	FlowProtoTimeoutPtr	,
		flow_timeouts
	)

SC_ATOMIC_DECLARE() [2/4]

SC_ATOMIC_DECLARE	(	uint64_t	,
		flow_memuse
	)

flow memuse counter (atomic), for enforcing memcap limit

SC_ATOMIC_DECLARE() [3/4]

SC_ATOMIC_DECLARE	(	unsigned int	,
		flow_flags
	)

atomic flags

SC_ATOMIC_DECLARE() [4/4]

SC_ATOMIC_DECLARE	(	unsigned int	,
		flow_prune_idx
	)

atomic int that is used when freeing a flow from the hash. In this case we walk the hash to find a flow to free. This var records where we left off in the hash. Without this only the top rows of the hash are freed. This isn't just about fairness. Under severe pressure, the hash rows on top would be all freed and the time to find a flow to free increased with every run.

Variable Documentation

flow_config

FlowConfig flow_config

Definition at line 102 of file flow.c.

Referenced by FlowGetExistingFlowFromFlowId(), FlowGetFlowFromHash(), FlowGetIpPairProtoHash(), FlowGetMemcap(), FlowInitConfig(), FlowKeyGetHash(), FlowReset(), FlowSetMemcap(), FlowShutdown(), and FlowSparePoolUpdate().

flow_freefuncs

FlowProtoFreeFunc flow_freefuncs[FLOW_PROTO_MAX]

Definition at line 100 of file flow.c.

Referenced by FlowClearMemory(), FlowInitFlowProto(), and FlowSetProtoFreeFunc().

flow_timeouts_delta

FlowProtoTimeout flow_timeouts_delta[FLOW_PROTO_MAX]

Definition at line 99 of file flow.c.

Referenced by FlowInitFlowProto().

flow_timeouts_emerg

FlowProtoTimeout flow_timeouts_emerg[FLOW_PROTO_MAX]

Definition at line 98 of file flow.c.

Referenced by FlowInitFlowProto(), and FlowTimeoutsEmergency().

flow_timeouts_normal

FlowProtoTimeout flow_timeouts_normal[FLOW_PROTO_MAX]

FlowProto specific timeouts and free/state functions

Definition at line 97 of file flow.c.

Referenced by FlowInitFlowProto(), and FlowTimeoutsInit().

run_mode

int run_mode

Run mode selected

Definition at line 175 of file suricata.c.