flow.c File Reference

#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-timeout.h"
#include "flow-manager.h"
#include "flow-storage.h"
#include "flow-bypass.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-debug.h"
#include "util-privs.h"
#include "detect.h"
#include "detect-engine-state.h"
#include "stream.h"
#include "app-layer-parser.h"
#include "threads.h"

Include dependency graph for flow.c:

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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 (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)
void	FlowCleanupAppLayer (Flow *f)
int	FlowUpdateSpareFlows (void)
	Make sure we have enough spare flows. More...
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)
	Update Packet and Flow. More...
void	FlowHandlePacket (ThreadVars *tv, DecodeThreadVars *dtv, Packet *p)
	Entry point for packet flow handling. More...
void	FlowInitConfig (char quiet)
	initialize the configuration More...
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...
AppProto	FlowGetAppProtocol (const Flow *f)
void *	FlowGetAppState (const Flow *f)
uint8_t	FlowGetDisruptionFlags (const Flow *f, uint8_t flags)
	get 'disruption' flags: GAP/DEPTH/PASS More...
void	FlowUpdateState (Flow *f, enum FlowState s)
void	FlowGetLastTimeAsParts (Flow *flow, uint64_t *secs, uint64_t *usecs)
	Get flow last time as individual values. More...

Variables
FlowProtoTimeout	flow_timeouts_normal [FLOW_PROTO_MAX]
FlowProtoTimeout	flow_timeouts_emerg [FLOW_PROTO_MAX]
FlowProtoFreeFunc	flow_freefuncs [FLOW_PROTO_MAX]
FlowQueue	flow_spare_q
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 66 of file flow.c.

FLOW_DEFAULT_HASHSIZE

#define FLOW_DEFAULT_HASHSIZE   65536

Definition at line 69 of file flow.c.

FLOW_DEFAULT_MEMCAP

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

Definition at line 71 of file flow.c.

FLOW_DEFAULT_PREALLOC

#define FLOW_DEFAULT_PREALLOC   10000

Definition at line 73 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 254 of file flow.c.

References Flow_::flags, and FLOW_CHANGE_PROTO.

FlowCleanupAppLayer()

void FlowCleanupAppLayer

(

Flow *

f

)

Definition at line 139 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 1044 of file flow.c.

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

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FlowGetAppProtocol()

AppProto FlowGetAppProtocol

(

const Flow *

f

)

Definition at line 1077 of file flow.c.

References Flow_::alproto.

Referenced by JsonBuildFileInfoRecord().

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FlowGetAppState()

void* FlowGetAppState

(

const Flow *

f

)

Definition at line 1082 of file flow.c.

References Flow_::alstate.

Referenced by DetectEngineStateResetTxs(), HttpXFFGetIP(), HttpXFFGetIPFromTx(), JsonEmailAddMetadata(), JsonHttpAddMetadata(), JsonHttpLogJSONBodyBase64(), JsonHttpLogJSONBodyPrintable(), JsonNFSAddMetadata(), JsonNFSAddMetadataRPC(), JsonRFBAddMetadata(), JsonSIPAddMetadata(), JsonSMBAddMetadata(), and JsonSMTPAddMetadata().

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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 ammended

Return values

flags

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

Definition at line 1094 of file flow.c.

References TcpSession_::client, flags, TcpStream_::flags, Flow_::proto, Flow_::protoctx, TcpSession_::server, STREAM_DEPTH, STREAM_GAP, STREAM_TOSERVER, STREAMTCP_STREAM_FLAG_DEPTH_REACHED, and STREAMTCP_STREAM_FLAG_GAP.

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 1137 of file flow.c.

References Flow_::lastts.

FlowGetMemcap()

uint64_t FlowGetMemcap

(

void

)

Return memcap value.

Return values

memcap

value

Definition at line 127 of file flow.c.

References flow_config, and SC_ATOMIC_GET.

FlowGetMemuse()

uint64_t FlowGetMemuse

(

void

)

Definition at line 133 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 334 of file flow.c.

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

Referenced by FlowHandlePacketUpdate().

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FlowHandlePacket()

void FlowHandlePacket	(	ThreadVars *	tv,
		DecodeThreadVars *	dtv,
		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 513 of file flow.c.

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

Referenced by UTHBuildPacketOfFlows().

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FlowHandlePacketUpdate()

void FlowHandlePacketUpdate	(	Flow *	f,
		Packet *	p
	)

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 412 of file flow.c.

References BypassedFlowUpdate(), COPY_TIMESTAMP, EngineModeIsIPS(), Flow_::flags, FLOW_BYPASSED_TIMEOUT, FLOW_PKT_TOSERVER, FLOW_STATE_LOCAL_BYPASSED, FLOW_TO_DST_SEEN, Packet_::flowflags, FlowGetPacketDirection(), FlowUpdateState(), GET_PKT_LEN, Flow_::lastts, Packet_::pcap_cnt, SC_ATOMIC_GET, SCLogDebug, 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 222 of file flow.c.

References Flow_::flags, and FLOW_HAS_ALERTS.

FlowInitConfig()

void FlowInitConfig

(

char

quiet

)

initialize the configuration

Warning

Not thread safe

set config values for memcap, prealloc and hash_size

Definition at line 529 of file flow.c.

References CLS, ConfGet(), ConfGetInt(), FlowCnf_::emergency_recovery, FALSE, 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, flow_spare_q, FlowAlloc(), FlowEnqueue(), FlowInitFlowProto(), FlowQueueInit(), FlowStorageSize(), FlowCnf_::hash_rand, FlowCnf_::hash_size, FlowQueue_::len, ParseSizeStringU64(), FlowCnf_::prealloc, RandomGet(), SC_ATOMIC_ADD, SC_ATOMIC_GET, SC_ATOMIC_INIT, SC_ATOMIC_SET, SC_ERR_FATAL, SC_ERR_FLOW_INIT, SC_ERR_INVALID_VALUE, SC_ERR_INVALID_YAML_CONF_ENTRY, SC_ERR_SIZE_PARSE, 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 737 of file flow.c.

References FlowProtoTimeout_::bypassed_timeout, FlowProtoTimeout_::closed_timeout, ConfGetNode(), ConfNodeLookupChild(), ConfNodeLookupChildValue(), FlowProtoTimeout_::est_timeout, FLOW_DEFAULT_BYPASSED_TIMEOUT, FLOW_DEFAULT_CLOSED_TIMEOUT, FLOW_DEFAULT_EMERG_BYPASSED_TIMEOUT, FLOW_DEFAULT_EMERG_CLOSED_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_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_TCP, FLOW_PROTO_UDP, flow_timeouts_emerg, flow_timeouts_normal, FlowTimeoutsInit(), FlowProtoFreeFunc_::Freefunc, FlowProtoTimeout_::new_timeout, proto, SET_DEFAULTS, and StringParseUint32().

Referenced by FlowInitConfig().

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FlowRegisterTests()

void FlowRegisterTests

(

void

)

Function to register the Flow Unitests.

Definition at line 1357 of file flow.c.

References UtRegisterTest().

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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 235 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 211 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 200 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 112 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 1068 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 684 of file flow.c.

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 303 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 244 of file flow.c.

References Flow_::flags, and FLOW_CHANGE_PROTO.

Referenced by AppLayerProtoDetectReset().

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FlowUpdateSpareFlows()

int FlowUpdateSpareFlows

(

void

)

Make sure we have enough spare flows.

Enforce the prealloc parameter, so keep at least prealloc flows in the spare queue and free flows going over the limit.

Return values

1	if the queue was properly updated (or if it already was in good shape)
0	otherwise.

Definition at line 158 of file flow.c.

References flow_config, flow_spare_q, FlowAlloc(), FlowDequeue(), FlowEnqueue(), FlowFree(), FQLOCK_LOCK, FQLOCK_UNLOCK, len, FlowQueue_::len, FlowCnf_::prealloc, and SCEnter.

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FlowUpdateState()

void FlowUpdateState	(	Flow *	f,
		enum FlowState	s
	)

Definition at line 1118 of file flow.c.

References Flow_::fb, and SC_ATOMIC_SET.

Referenced by FlowHandlePacketUpdate(), and PacketBypassCallback().

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SC_ATOMIC_DECLARE() [1/3]

SC_ATOMIC_DECLARE	(	uint64_t	,
		flow_memuse
	)

flow memuse counter (atomic), for enforcing memcap limit

SC_ATOMIC_DECLARE() [2/3]

SC_ATOMIC_DECLARE	(	unsigned int	,
		flow_flags
	)

atomic flags

SC_ATOMIC_DECLARE() [3/3]

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 presure, 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 95 of file flow.c.

Referenced by FlowGetExistingFlowFromHash(), FlowGetFlowFromHash(), FlowGetFromFlowKey(), FlowGetMemcap(), FlowInitConfig(), FlowKeyGetHash(), FlowSetMemcap(), and FlowUpdateSpareFlows().

flow_freefuncs

FlowProtoFreeFunc flow_freefuncs[FLOW_PROTO_MAX]

Definition at line 90 of file flow.c.

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

flow_spare_q

FlowQueue flow_spare_q

spare/unused/prealloced flows live here

Definition at line 93 of file flow.c.

Referenced by FlowGetFromFlowKey(), FlowInitConfig(), FlowMoveToSpare(), and FlowUpdateSpareFlows().

flow_timeouts_emerg

FlowProtoTimeout flow_timeouts_emerg[FLOW_PROTO_MAX]

Definition at line 89 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 88 of file flow.c.

Referenced by FlowInitFlowProto(), and FlowTimeoutsInit().

run_mode

int run_mode

Run mode selected

Definition at line 201 of file suricata.c.