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/* $Id$ */
/*
* ** Copyright (C) 2005-2010 Sourcefire, Inc.
* ** AUTHOR: Steven Sturges
* **
* ** This program is free software; you can redistribute it and/or modify
* ** it under the terms of the GNU General Public License Version 2 as
* ** published by the Free Software Foundation. You may not use, modify or
* ** distribute this program under any other version of the GNU General
* ** Public License.
* **
* ** 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
* ** along with this program; if not, write to the Free Software
* ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* */
/* stream_api.h
*
* Purpose: Definition of the StreamAPI. To be used as a common interface
* for TCP (and later UDP & ICMP) Stream access for other
* preprocessors and detection plugins.
*
* Arguments:
*
* Effect:
*
* Comments:
*
* Any comments?
*
*/
#ifndef STREAM_API_H_
#define STREAM_API_H_
#include <sys/types.h>
#include "ipv6_port.h"
#include "preprocids.h" /* IDs are used when setting preproc specific data */
#include "bitop.h"
#include "decode.h"
#include "sfPolicy.h"
#define IGNORE_FLAG_ALWAYS 0x01
#define SSN_MISSING_NONE 0x00
#define SSN_MISSING_BEFORE 0x01
#define SSN_MISSING_AFTER 0x02
#define SSN_MISSING_BOTH (SSN_MISSING_BEFORE | SSN_MISSING_AFTER)
#define SSN_DIR_NONE 0x0
#define SSN_DIR_CLIENT 0x1
#define SSN_DIR_SENDER 0x1
#define SSN_DIR_SERVER 0x2
#define SSN_DIR_RESPONDER 0x2
#define SSN_DIR_BOTH 0x03
#define SSNFLAG_SEEN_CLIENT 0x00000001
#define SSNFLAG_SEEN_SENDER 0x00000001
#define SSNFLAG_SEEN_SERVER 0x00000002
#define SSNFLAG_SEEN_RESPONDER 0x00000002
#define SSNFLAG_ESTABLISHED 0x00000004
#define SSNFLAG_NMAP 0x00000008
#define SSNFLAG_ECN_CLIENT_QUERY 0x00000010
#define SSNFLAG_ECN_SERVER_REPLY 0x00000020
#define SSNFLAG_HTTP_1_1 0x00000040 /* has stream seen HTTP 1.1? */
#define SSNFLAG_SEEN_PMATCH 0x00000080 /* seen pattern match? */
#define SSNFLAG_MIDSTREAM 0x00000100 /* picked up midstream */
#define SSNFLAG_CLIENT_FIN 0x00000200 /* server sent fin */
#define SSNFLAG_SERVER_FIN 0x00000400 /* client sent fin */
#define SSNFLAG_CLIENT_PKT 0x00000800 /* packet is from the client */
#define SSNFLAG_SERVER_PKT 0x00001000 /* packet is from the server */
#define SSNFLAG_COUNTED_INITIALIZE 0x00002000
#define SSNFLAG_COUNTED_ESTABLISH 0x00004000
#define SSNFLAG_COUNTED_CLOSING 0x00008000
#define SSNFLAG_TIMEDOUT 0x00010000
#define SSNFLAG_PRUNED 0x00020000
#define SSNFLAG_RESET 0x00040000
#define SSNFLAG_DROP_CLIENT 0x00080000
#define SSNFLAG_DROP_SERVER 0x00100000
#define SSNFLAG_LOGGED_QUEUE_FULL 0x00200000
#define SSNFLAG_ALL 0xFFFFFFFF /* all that and a bag of chips */
#define SSNFLAG_NONE 0x00000000 /* nothing, an MT bag of chips */
#define STREAM_FLPOLICY_NONE 0x00
#define STREAM_FLPOLICY_FOOTPRINT 0x01 /* size-based footprint flush */
#define STREAM_FLPOLICY_LOGICAL 0x02 /* queued bytes-based flush */
#define STREAM_FLPOLICY_RESPONSE 0x03 /* flush when we see response */
#define STREAM_FLPOLICY_SLIDING_WINDOW 0x04 /* flush on sliding window */
#if 0
#define STREAM_FLPOLICY_CONSUMED 0x05 /* purge consumed bytes */
#endif
#define STREAM_FLPOLICY_IGNORE 0x06 /* ignore this traffic */
#define STREAM_FLPOLICY_MAX STREAM_FLPOLICY_IGNORE
#define STREAM_FLPOLICY_SET_ABSOLUTE 0x01
#define STREAM_FLPOLICY_SET_APPEND 0x02
#define UNKNOWN_PORT 0
#define STREAM_API_VERSION5 5
typedef void (*StreamAppDataFree)(void *);
typedef int (*PacketIterator)
(
struct pcap_pkthdr *,
uint8_t *, /* pkt pointer */
void * /* user-defined data pointer */
);
typedef int (*StreamSegmentIterator)
(
struct pcap_pkthdr *,
uint8_t *, /* pkt pointer */
uint8_t *, /* payload pointer */
uint32_t, /* sequence number */
void * /* user-defined data pointer */
);
typedef struct _StreamFlowData
{
BITOP boFlowbits;
unsigned char flowb[1];
} StreamFlowData;
typedef struct _stream_api
{
int version;
/*
* Drop on Inline Alerts for Midstream pickups
*
* Parameters
*,
* Returns
* 0 if not alerting
* !0 if alerting
*/
int (*alert_inline_midstream_drops)(void);
/* Set direction of session
*
* Parameters:
* Session Ptr
* New Direction
* IP
* Port
*/
void (*update_direction)(void *, char, snort_ip_p, uint16_t );
/* Get direction of packet
*
* Parameters:
* Packet
*/
uint32_t (*get_packet_direction)(Packet *);
/* Stop inspection for session, up to count bytes (-1 to ignore
* for life or until resume).
*
* If response flag is set, automatically resume inspection up to
* count bytes when a data packet in the other direction is seen.
*
* Also marks the packet to be ignored
*
* Parameters
* Session Ptr
* Packet
* Direction
* Bytes
* Response Flag
*/
void (*stop_inspection)(void *, Packet *, char, int32_t, int);
/* Turn off inspection for potential session.
* Adds session identifiers to a hash table.
* TCP only.
*
* Parameters
* IP addr #1
* Port #1
* IP addr #2
* Port #2
* Protocol
* Direction
* Flags (permanent)
*
* Returns
* 0 on success
* -1 on failure
*/
int (*ignore_session)(snort_ip_p, uint16_t, snort_ip_p, uint16_t,
char, char, char);
/* Resume inspection for session.
*
* Parameters
* Session Ptr
* Direction
*/
void (*resume_inspection)(void *, char);
/* Drop traffic arriving on session.
*
* Parameters
* Session Ptr
* Direction
*/
void (*drop_traffic)(void *, char);
/* Drop retransmitted packet arriving on session.
*
* Parameters
* Packet
*/
void (*drop_packet)(Packet *);
/* Set a reference to application data for a session
*
* Parameters
* Session Ptr
* Application Protocol
* Application Data reference (pointer)
* Application Data free function
*/
void (*set_application_data)(void *, uint32_t, void *, StreamAppDataFree);
/* Set a reference to application data for a session
*
* Parameters
* Session Ptr
* Application Protocol
*
* Returns
* Application Data reference (pointer)
*/
void *(*get_application_data)(void *, uint32_t);
/* Sets the flags for a session
* This ORs the supplied flags with the previous values
*
* Parameters
* Session Ptr
* Flags
*
* Returns
* New Flags
*/
uint32_t (*set_session_flags)(void *, uint32_t);
/* Gets the flags for a session
*
* Parameters
* Session Ptr
*/
uint32_t (*get_session_flags)(void *);
/* Flushes the stream on an alert
* Side that is flushed is the same as the packet.
*
* Parameters
* Packet
*/
int (*alert_flush_stream)(Packet *);
/* Flushes the stream on arrival of another packet
* Side that is flushed is the opposite of the packet.
*
* Parameters
* Packet
*/
int (*response_flush_stream)(Packet *);
/* Calls user-provided callback function for each packet of
* a reassembled stream. If the callback function returns non-zero,
* iteration ends.
*
* Parameters
* Packet
* Packet Iterator Function (called for each packet in the stream)
* user data (may be NULL)
*
* Returns
* number of packets
*/
int (*traverse_reassembled)(Packet *, PacketIterator, void *userdata);
/* Calls user-provided callback function for each segment of
* a reassembled stream. If the callback function returns non-zero,
* iteration ends.
*
* Parameters
* Packet
* StreamSegmentIterator Function (called for each packet in the stream)
* user data (may be NULL)
*
* Returns
* number of packets
*/
int (*traverse_stream_segments)(Packet *, StreamSegmentIterator, void *userdata);
/* Add session alert
*
* Parameters
* Session Ptr
* gen ID
* sig ID
*
* Returns
* 0 success
* -1 failure (max alerts reached)
*
*/
int (*add_session_alert)(void *, Packet *p, uint32_t, uint32_t);
/* Check session alert
*
* Parameters
* Session Ptr
* Packet
* gen ID
* sig ID
*
* Returns
* 0 if not previously alerted
* !0 if previously alerted
*/
int (*check_session_alerted)(void *, Packet *p, uint32_t, uint32_t);
/* Get Flowbits data
*
* Parameters
* Packet
*
* Returns
* Ptr to Flowbits Data
*/
StreamFlowData *(*get_flow_data)(Packet *p);
/* Set reassembly flush policy/direction for given session
*
* Parameters
* Session Ptr
* Flush Policy
* Direction(s)
* Flags
*
* Returns
* direction(s) of reassembly for session
*/
char (*set_reassembly)(void *, uint8_t, char, char);
/* Get reassembly direction for given session
*
* Parameters
* Session Ptr
*
* Returns
* direction(s) of reassembly for session
*/
char (*get_reassembly_direction)(void *);
/* Get reassembly flush_policy for given session
*
* Parameters
* Session Ptr
* Direction
*
* Returns
* flush policy for specified direction
*/
char (*get_reassembly_flush_policy)(void *, char);
/* Get true/false as to whether stream data is in
* sequence or packets are missing
*
* Parameters
* Session Ptr
* Direction
*
* Returns
* true/false
*/
char (*is_stream_sequenced)(void *, char);
/* Get whether there are missing packets before, after or
* before and after reassembled buffer
*
* Parameters
* Session Ptr
* Direction
*
* Returns
* SSN_MISSING_BOTH if missing before and after
* SSN_MISSING_BEFORE if missing before
* SSN_MISSING_AFTER if missing after
* SSN_MISSING_NONE if none missing
*/
int (*missing_in_reassembled)(void *, char);
/* Get true/false as to whether packets were missed on
* the stream
*
* Parameters
* Session Ptr
* Direction
*
* Returns
* true/false
*/
char (*missed_packets)(void *, char);
#ifdef TARGET_BASED
/* Get the protocol identifier from a stream
*
* Parameters
* Session Ptr
*
* Returns
* integer protocol identifier
*/
int16_t (*get_application_protocol_id)(void *);
/* Set the protocol identifier for a stream
*
* Parameters
* Session Ptr
* ID
*
* Returns
* integer protocol identifier
*/
int16_t (*set_application_protocol_id)(void *, int16_t);
/** Set service to either ignore, inspect or maintain session state.
* If this is called during parsing a preprocessor configuration, make
* sure to set the parsing argument to 1.
*/
void (*set_service_filter_status)(int service, int status, tSfPolicyId policyId, int parsing);
#endif
/** Set port to either ignore, inspect or maintain session state.
* If this is called during parsing a preprocessor configuration, make
* sure to set the parsing argument to 1.
*/
void (*set_port_filter_status)(int protocol, uint16_t port, int status, tSfPolicyId policyId, int parsing);
/* Get the current flush point
*
* Arguments
* void * - session pointer
* char - direction
*
* Returns
* Current flush point for session
*/
uint32_t (*get_flush_point)(void *, char);
/* Set the next flush point
*
* Arguments
* void * - session pointer
* char - direction
* uint32_t - flush point size
*/
void (*set_flush_point)(void *, char, uint32_t);
#ifdef TARGET_BASED
/* Turn off inspection for potential session.
* Adds session identifiers to a hash table.
* TCP only.
*
* Parameters
* IP addr #1
* Port #1
* IP addr #2
* Port #2
* Protocol
* ID
*
* Returns
* 0 on success
* -1 on failure
*/
int (*set_application_protocol_id_expected)(snort_ip_p, uint16_t, snort_ip_p, uint16_t,
char, int16_t);
#endif
} StreamAPI;
/* To be set by Stream5 (or Stream4) */
extern StreamAPI *stream_api;
/**Port Inspection States. Port can be either ignored,
* or inspected or session tracked. The values are bitmasks.
*/
typedef enum {
/**Dont monitor the port. */
PORT_MONITOR_NONE = 0x00,
/**Inspect the port. */
PORT_MONITOR_INSPECT = 0x01,
/**perform session tracking on the port. */
PORT_MONITOR_SESSION = 0x02
} PortMonitorStates;
#endif /* STREAM_API_H_ */
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