/* $NetBSD: iscsi_globals.h,v 1.27 2022/09/13 13:09:16 mlelstv Exp $ */
/*-
* Copyright (c) 2004,2005,2006,2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _ISCSI_GLOBALS_H
#define _ISCSI_GLOBALS_H
/*#include "opt_ddb.h" */
#define DDB 1
/* Includes we need in all files */
#include <sys/param.h>
#include <sys/mutex.h>
#include <sys/rwlock.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/scsiio.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsi_message.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>
#include <dev/scsipi/scsipiconf.h>
#include "iscsi.h"
#include "iscsi_pdu.h"
#include "iscsi_ioctl.h"
/* ------------------------ Code selection constants ------------------------ */
#define ISCSI_DEBUG 0
/* ------------------------- Global Constants ----------------------------- */
/* Version information */
#define INTERFACE_VERSION 2
#define VERSION_MAJOR 3
#define VERSION_MINOR 1
#define VERSION_STRING "NetBSD iSCSI Software Initiator 20110407"
/*
NOTE: CCBS_PER_SESSION must not exceed 256 due to the way the ITT
is constructed (it has the CCB index in its lower 8 bits). If it should ever
be necessary to increase the number beyond that (which isn't expected),
the corresponding ITT generation and extraction code must be rewritten.
*/
#define CCBS_PER_SESSION 32 /* ToDo: Reasonable number?? */
/*
NOTE: CCBS_FOR_SCSPI limits the number of outstanding commands for
SCSI commands, leaving some CCBs for keepalive and logout attempts,
which are needed for each connection.
*/
#define CCBS_FOR_SCSIPI 16 /* ToDo: Reasonable number?? */
/*
NOTE: PDUS_PER_CONNECTION is a number that could potentially impact
performance if set too low, as a single command may use up a lot of PDUs for
high values of First/MaxBurstLength and small values of
MaxRecvDataSegmentLength of the target.
*/
#define PDUS_PER_CONNECTION 64 /* ToDo: Reasonable number?? */
/* max outstanding serial nums before we give up on the connection */
#define SERNUM_BUFFER_LENGTH (CCBS_PER_SESSION / 2) /* ToDo: Reasonable?? */
/* The RecvDataSegmentLength for Target->Initiator */
#define DEFAULT_MaxRecvDataSegmentLength (64*1024)
/* Command timeout (reset on received PDU associated with the command's CCB) */
#define COMMAND_TIMEOUT (60 * hz) /* ToDo: Reasonable? (60 seconds) */
#define MAX_CCB_TIMEOUTS 3 /* Max number of tries to resend or SNACK */
#define MAX_CCB_TRIES 9 /* Max number of total tries to recover */
/* Connectionn timeout (reset on every valid received PDU) */
#define CONNECTION_TIMEOUT (2 * hz) /* ToDo: Reasonable? (2 seconds) */
#define CONNECTION_IDLE_TIMEOUT (30 * hz) /* Adjusted to Time2Retain/2 later */
#define MAX_CONN_TIMEOUTS 4 /* Max number of tries to ping a target */
/* Maximum attempts to recover connection */
#define MAX_RECOVERY_ATTEMPTS 2 /* If two attempts don't work, something */
/* probably is seriously broken */
/* PDU flags */
#define PDUF_BUSY 0x01 /* PDU is being sent, don't re-send */
#define PDUF_INQUEUE 0x02 /* PDU is in send queue */
#define PDUF_PRIORITY 0x04 /* Insert PDU at head of queue */
#define PDUF_NOUPDATE 0x10 /* Do not update PDU header/digest (test mode) */
/* CCB Flags */
#define CCBF_COMPLETE 0x0001 /* received status */
#define CCBF_RESENT 0x0002 /* ccb was resent */
#define CCBF_SENDTARGET 0x0004 /* SendTargets text request, not negotiation */
#define CCBF_GOT_RSP 0x0010 /* Got at least one response to this request */
#define CCBF_REASSIGN 0x0020 /* Command can be reassigned */
#define CCBF_OTHERCONN 0x0040 /* a logout for a different connection */
#define CCBF_WAITQUEUE 0x0080 /* CCB is on waiting queue */
/* --------------------------- Global Types ------------------------------- */
/* Connection state */
typedef enum {
/* first three correspond to CSG/NSG coding */
ST_SEC_NEG = 0, /* security negotiation phase */
ST_OP_NEG = 1, /* operational negotiation phase */
ST_FULL_FEATURE = 3, /* full feature phase */
/* rest is internal */
ST_WINDING_DOWN = 4, /* connection termination initiated, logging out */
ST_LOGOUT_SENT = 5, /* logout has been sent */
ST_SETTLING = 6, /* waiting for things to settle down */
ST_IDLE = 7 /* connection is idle (ready to delete) */
} conn_state_t;
/* Logout state */
typedef enum {
NOT_LOGGED_OUT, /* Not logged out */
LOGOUT_SENT, /* Logout was sent */
LOGOUT_SUCCESS, /* Logout succeeded */
LOGOUT_FAILED /* Logout failed */
} logout_state_t;
/* CCB Disposition */
typedef enum {
CCBDISP_UNUSED, /* 0 = In free pool */
CCBDISP_BUSY, /* This CCB is busy, don't allow rx ops */
CCBDISP_NOWAIT, /* Not waiting for anything */
CCBDISP_FREE, /* Free this CCB when done */
CCBDISP_WAIT, /* Calling thread is waiting for completion */
CCBDISP_SCSIPI, /* Call scsipi_done when operation completes */
CCBDISP_DEFER /* Defer waiting until all PDUs have been queued */
} ccb_disp_t;
/* PDU Disposition */
typedef enum {
PDUDISP_UNUSED, /* 0 = In free pool */
PDUDISP_FREE, /* Free this PDU when done */
PDUDISP_WAIT /* Waiting for acknowledge */
} pdu_disp_t;
/* Timeout state */
typedef enum {
TOUT_NONE, /* Initial */
TOUT_ARMED, /* callout is scheduled */
TOUT_QUEUED, /* put into timeout queue */
TOUT_BUSY /* cleanup thread working */
} tout_state_t;
typedef struct connection_s connection_t;
typedef struct session_s session_t;
typedef struct ccb_s ccb_t;
typedef struct pdu_s pdu_t;
/* the serial number management structure (a circular buffer) */
typedef struct {
uint32_t ExpSN; /* ExpxxSN (Data or Stat) sent to the target */
uint32_t next_sn; /* next_sn (== ExpSN if no ack is pending) */
int top; /* top of buffer (newest element) */
int bottom; /* bottom of buffer (oldest element) */
uint32_t sernum[SERNUM_BUFFER_LENGTH]; /* the serial numbers */
bool ack[SERNUM_BUFFER_LENGTH]; /* acknowledged? */
} sernum_buffer_t;
/*
The per-PDU data structure.
*/
struct pdu_s {
TAILQ_ENTRY(pdu_s) pdu_chain; /* freelist or wait list (or no list) */
TAILQ_ENTRY(pdu_s) pdu_send_chain;
/* chaining PDUs waiting to be sent */
pdu_disp_t pdu_disp; /* what to do with this pdu */
uint32_t pdu_flags; /* various processing flags */
pdu_header_t pdu_hdr; /* Buffer for PDU associated with cmd */
void *pdu_temp_data; /* (free after use) */
uint32_t pdu_temp_data_len; /* size of temp data */
struct uio pdu_uio; /* UIO structure */
struct iovec pdu_io_vec[4];
/* Header + data + data-digest + padding */
struct uio pdu_save_uio;
/* UIO structure save for retransmits */
struct iovec pdu_save_iovec[4];
/* Header + data + data-digest + padding */
uint32_t pdu_data_digest;
/* holds data digest if enabled */
ccb_t *pdu_owner;
/* the ccb this PDU belongs to (if any) */
connection_t *pdu_connection;
/* the connection this PDU belongs to */
};
/* the PDU list type */
TAILQ_HEAD(pdu_list_s, pdu_s);
typedef struct pdu_list_s pdu_list_t;
/*
The per-command data structure. Calling it ccb in correspondence
to other HA drivers.
*/
struct ccb_s {
TAILQ_ENTRY(ccb_s) ccb_chain;
/* either freelist or waiting list (or no list) */
uint32_t ccb_status; /* Status gets entered here */
ccb_disp_t ccb_disp; /* what to do with this ccb */
struct callout ccb_timeout; /* To make sure it isn't lost */
TAILQ_ENTRY(ccb_s) ccb_tchain;
tout_state_t ccb_timedout;
int ccb_num_timeouts;
/* How often we've sent out SNACK without answer */
int ccb_total_tries;
/* How often we've tried to recover */
uint32_t ccb_ITT;
/* task tag: ITT counter + sess id + CCB index */
sernum_buffer_t ccb_DataSN_buf;
/* Received Data Seq nums (read ops only) */
void *ccb_par;
/* misc. parameter for this request */
struct scsipi_xfer *ccb_xs;
/* the scsipi_xfer for this cmd */
void *ccb_temp_data;
/* to hold state (mainly during negotiation) */
void *ccb_text_data;
/* holds accumulated text for continued PDUs */
uint32_t ccb_text_len;
/* length of text data so far */
uint64_t ccb_lun; /* LUN */
uint32_t ccb_tag; /* Command tag */
uint8_t *ccb_cmd; /* SCSI command block */
uint16_t ccb_cmdlen; /* SCSI command block length */
bool ccb_data_in; /* if this is a read request */
uint8_t *ccb_data_ptr; /* data pointer for read/write */
uint32_t ccb_data_len; /* total data length */
uint32_t ccb_xfer_len; /* data transferred on read */
uint32_t ccb_residual; /* residual data size */
void *ccb_sense_ptr; /* sense data pointer */
int ccb_sense_len_req; /* requested sense data length */
int ccb_sense_len_got; /* actual sense data length */
pdu_t *ccb_pdu_waiting; /* PDU waiting to be ack'ed */
volatile uint32_t ccb_CmdSN; /* CmdSN associated with waiting PDU */
int ccb_flags;
connection_t *ccb_connection; /* connection for CCB */
session_t *ccb_session; /* session for CCB */
};
/* the CCB list type */
TAILQ_HEAD(ccb_list_s, ccb_s);
typedef struct ccb_list_s ccb_list_t;
/*
Per connection data: the connection structure
*/
struct connection_s {
TAILQ_ENTRY(connection_s) c_connections;
kmutex_t c_lock;
kcondvar_t c_conn_cv;
kcondvar_t c_pdu_cv;
kcondvar_t c_ccb_cv;
kcondvar_t c_idle_cv;
pdu_list_t c_pdu_pool; /* the free PDU pool */
ccb_list_t c_ccbs_waiting;
/* CCBs waiting for completion */
pdu_list_t c_pdus_to_send;
/* the PDUs waiting to be sent */
sernum_buffer_t c_StatSN_buf;
/* to keep track of received StatSNs */
uint32_t c_max_transfer;
/* min(MaxRecvDataSegmentLength, MaxBurstLength) */
uint32_t c_max_firstimmed;
/* 0 if InitialR2T=Yes, else
min of (MaxRecvDataSegmentLength, FirstBurstLength) */
uint32_t c_max_firstdata;
/* 0 if ImmediateData=No, else min of */
/* (MaxRecvDataSegmentLength, FirstBurstLength) */
uint32_t c_MaxRecvDataSegmentLength;
/* Target's value */
uint32_t c_Our_MaxRecvDataSegmentLength;
/* Our own value */
bool c_HeaderDigest; /* TRUE if doing CRC */
bool c_DataDigest; /* TRUE if doing CRC */
uint32_t c_Time2Wait;
/* Negotiated default or logout value */
uint32_t c_Time2Retain;
/* Negotiated default or logout value */
uint16_t c_id;
/* connection ID (unique within session) */
conn_state_t c_state; /* State of connection */
struct lwp *c_threadobj;
/* proc/thread pointer of socket owner */
krwlock_t c_sock_rw;
struct file *c_sock; /* the connection's socket */
session_t *c_session;
/* back pointer to the owning session */
struct lwp *c_rcvproc; /* receive thread */
struct lwp *c_sendproc; /* send thread */
uint32_t c_terminating;
/* if closing down: status */
int c_recover; /* recovery count */
/* (reset on first successful data transfer) */
volatile unsigned c_usecount; /* number of active CCBs */
unsigned c_pducount; /* number of active PDUs */
bool c_destroy; /* conn will be destroyed */
bool c_in_session;
/* if it's linked into the session list */
logout_state_t c_loggedout;
/* status of logout (for recovery) */
struct callout c_timeout;
/* Timeout for checking if connection is dead */
TAILQ_ENTRY(connection_s) c_tchain;
tout_state_t c_timedout;
int c_num_timeouts;
/* How often we've sent out a NOP without answer */
uint32_t c_idle_timeout_val;
/* Connection timeout value when idle */
iscsi_login_parameters_t *c_login_par;
/* only valid during login */
pdu_t c_pdu[PDUS_PER_CONNECTION]; /* PDUs */
};
/* the connection list type */
TAILQ_HEAD(connection_list_s, connection_s);
typedef struct connection_list_s connection_list_t;
/*
Per session data: the session structure
*/
struct session_s {
/* Interface to child drivers.
NOTE: sc_adapter MUST be the first field in this structure so we can
easily get from adapter to session.
*/
struct scsipi_adapter s_sc_adapter;
struct scsipi_channel s_sc_channel;
device_t s_child_dev;
/* the child we're associated with - (NULL if not mapped) */
int s_refcount; /* session in use by scsipi */
/* local stuff */
TAILQ_ENTRY(session_s) s_sessions; /* the list of sessions */
kmutex_t s_lock;
kcondvar_t s_sess_cv;
kcondvar_t s_ccb_cv;
ccb_list_t s_ccb_pool; /* The free CCB pool */
int s_send_window;
uint16_t s_id; /* session ID (unique within driver) */
uint16_t s_TSIH; /* Target assigned session ID */
uint32_t s_CmdSN; /* Current CmdSN */
uint32_t s_ExpCmdSN; /* Current max ExpCmdSN received */
uint32_t s_MaxCmdSN; /* Current MaxCmdSN */
/* negotiated values */
uint32_t s_ErrorRecoveryLevel;
uint32_t s_FirstBurstLength;
uint32_t s_MaxBurstLength;
bool s_ImmediateData;
bool s_InitialR2T;
uint32_t s_MaxOutstandingR2T;
uint32_t s_MaxConnections;
uint32_t s_DefaultTime2Wait;
uint32_t s_DefaultTime2Retain;
iscsi_login_session_type_t s_login_type; /* session type */
/* for send_targets requests */
uint8_t *s_target_list;
uint32_t s_target_list_len;
uint32_t s_conn_id; /* connection ID counter */
uint32_t s_terminating; /* if closing down: status */
uint32_t s_active_connections;
/* currently active connections */
uint32_t s_total_connections;
/* connections associated with this session (active or winding down) */
connection_list_t s_conn_list; /* the list of connections */
connection_t *s_mru_connection;
/* the most recently used connection */
ccb_t s_ccb[CCBS_PER_SESSION]; /* CCBs */
char s_tgtname[ISCSI_STRING_LENGTH + 1];
/* iSCSI target name */
};
/* the session list type */
TAILQ_HEAD(session_list_s, session_s);
typedef struct session_list_s session_list_t;
/*
Event notification structures
*/
typedef struct event_s {
TAILQ_ENTRY(event_s) ev_link; /* next event in queue */
iscsi_event_t ev_event_kind; /* which event */
uint32_t ev_session_id; /* affected session ID */
uint32_t ev_connection_id;/* affected connection ID */
uint32_t ev_reason; /* event reason */
} event_t;
/* the event list entry type */
TAILQ_HEAD(event_list_s, event_s);
typedef struct event_list_s event_list_t;
typedef struct event_handler_s {
TAILQ_ENTRY(event_handler_s) evh_link; /* next handler */
uint32_t evh_id; /* unique ID */
event_list_t evh_events; /* list of events pending */
iscsi_wait_event_parameters_t *evh_waiter; /* waiting parameter */
/* following to detect dead handlers */
event_t *evh_first_in_list;
} event_handler_t;
/* the event list entry type */
TAILQ_HEAD(event_handler_list_s, event_handler_s);
typedef struct event_handler_list_s event_handler_list_t;
/* /dev/iscsi0 state */
struct iscsifd {
TAILQ_ENTRY(iscsifd) fd_link;
device_t fd_dev;
int fd_unit;
};
/* ------------------------- Global Variables ----------------------------- */
/* In iscsi_main.c */
extern struct cfattach iscsi_ca; /* the device attach structure */
extern session_list_t iscsi_sessions; /* the list of sessions */
extern bool iscsi_detaching; /* signal to cleanup thread it should exit */
extern uint32_t iscsi_num_send_threads; /* the number of active send threads */
extern uint8_t iscsi_InitiatorName[ISCSI_STRING_LENGTH];
extern uint8_t iscsi_InitiatorAlias[ISCSI_STRING_LENGTH];
extern login_isid_t iscsi_InitiatorISID;
/* Debugging stuff */
#ifndef DDB
#define Debugger() panic("should call debugger here (iscsi.c)")
#endif /* ! DDB */
#ifdef ISCSI_DEBUG
extern int iscsi_debug_level; /* How much debug info to display */
extern bool iscsi_hex_bignums; /* Whether to encode parameters in hex or base64 */
#define DEBOUT(x) printf x
#define DEB(lev,x) { if (iscsi_debug_level >= lev) printf x ;}
#define DEBC(conn,lev,x) { if (iscsi_debug_level >= lev) { printf("S%dC%d: ", \
conn && conn->c_session ? conn->c_session->s_id : -1, \
conn ? conn->c_id : -1); printf x ;}}
#define STATIC static
#else
#define DEBOUT(x)
#define DEB(lev,x)
#define DEBC(conn,lev,x)
#define STATIC static
#endif
/* Critical section macros */
/* misc stuff */
#define min(a, b) ((a) < (b)) ? (a) : (b)
#define max(a, b) ((a) < (b)) ? (b) : (a)
/*
Convert unsigned int to 3-byte value (for DataSegmentLength field in PDU)
*/
static __inline void
hton3(uint32_t val, uint8_t *bytes)
{
bytes[0] = (uint8_t) (val >> 16);
bytes[1] = (uint8_t) (val >> 8);
bytes[2] = (uint8_t) val;
}
/*
Convert 3-byte value to unsigned int (for DataSegmentLength field in PDU)
*/
static __inline uint32_t
ntoh3(uint8_t *bytes)
{
return (bytes[0] << 16) | (bytes[1] << 8) | bytes[2];
}
/*
* Convert uint64 to network byte order (for LUN field in PDU)
*/
static __inline uint64_t
htonq(uint64_t x)
{
#if BYTE_ORDER == LITTLE_ENDIAN
uint8_t *s = (uint8_t *) & x;
return (uint64_t) ((uint64_t) s[0] << 56 | (uint64_t) s[1] << 48 |
(uint64_t) s[2] << 40 | (uint64_t) s[3] << 32 |
(uint64_t) s[4] << 24 | (uint64_t) s[5] << 16 |
(uint64_t) s[6] << 8 | (uint64_t) s[7]);
#else
return x;
#endif
}
#define ntohq(x) htonq(x)
/*
* Serial number buffer empty?
*/
static __inline bool
sn_empty(sernum_buffer_t *buf)
{
return buf->top == buf->bottom;
}
/*
* Serial number compare
*/
static __inline bool
sn_a_lt_b(uint32_t a, uint32_t b)
{
return (a < b && !((b - a) & 0x80000000)) ||
(a > b && ((a - b) & 0x80000000));
}
static __inline bool
sn_a_le_b(uint32_t a, uint32_t b)
{
return (a <= b && !((b - a) & 0x80000000)) ||
(a >= b && ((a - b) & 0x80000000));
}
/* in iscsi_ioctl.c */
void iscsi_init_cleanup(void);
int iscsi_destroy_cleanup(void);
void iscsi_notify_cleanup(void);
/* Parameter for logout is reason code in logout PDU, -1 for don't send logout */
#define NO_LOGOUT -1
#define LOGOUT_SESSION 0
#define LOGOUT_CONNECTION 1
#define RECOVER_CONNECTION 2
void add_event(iscsi_event_t, uint32_t, uint32_t, uint32_t);
void kill_connection(connection_t *, uint32_t, int, bool);
void kill_session(uint32_t, uint32_t, int, bool);
int kill_all_sessions(void);
void handle_connection_error(connection_t *, uint32_t, int);
void add_connection_cleanup(connection_t *);
int iscsiioctl(struct file *, u_long, void *);
session_t *find_session(uint32_t);
connection_t *find_connection(session_t *, uint32_t);
int ref_session(session_t *);
void unref_session(session_t *);
/* in iscsi_main.c */
/*void iscsiattach(void *); */
int iscsidetach(device_t, int);
void iscsi_done(ccb_t *);
int map_session(session_t *, device_t);
int unmap_session(session_t *);
/* in iscsi_send.c */
void iscsi_send_thread(void *);
connection_t *assign_connection(session_t *session, bool waitok);
void resend_pdu(ccb_t *);
int send_login(connection_t *);
int send_logout(connection_t *, connection_t *, int, bool);
int send_data_out(connection_t *, pdu_t *, ccb_t *, ccb_disp_t, bool);
void send_run_xfer(session_t *, struct scsipi_xfer *);
int send_send_targets(session_t *, uint8_t *);
int send_task_management(connection_t *, ccb_t *, struct scsipi_xfer *, int);
void negotiate_login(connection_t *, pdu_t *, ccb_t *);
void acknowledge_text(connection_t *, pdu_t *, ccb_t *);
void start_text_negotiation(connection_t *);
void negotiate_text(connection_t *, pdu_t *, ccb_t *);
int send_nop_out(connection_t *, pdu_t *);
void snack_missing(connection_t *, ccb_t *, uint8_t, uint32_t, uint32_t);
void send_snack(connection_t *, pdu_t *, ccb_t *, uint8_t);
int send_send_targets(session_t *, uint8_t *);
void send_command(ccb_t *, ccb_disp_t, bool, bool);
#ifndef ISCSI_MINIMAL
int send_io_command(session_t *, uint64_t, scsireq_t *, bool, uint32_t);
#endif
void connection_timeout_co(void *);
void ccb_timeout_co(void *);
void connection_timeout(connection_t *);
void connection_timeout_start(connection_t *, int);
void connection_timeout_stop(connection_t *);
void ccb_timeout(ccb_t *);
void ccb_timeout_start(ccb_t *, int);
void ccb_timeout_stop(ccb_t *);
/* in iscsi_rcv.c */
void iscsi_rcv_thread(void *);
/* in iscsi_utils.c */
uint32_t gen_digest(const void *, size_t);
uint32_t gen_digest_2(const void *, size_t, const void *, size_t);
void create_ccbs(session_t *);
void destroy_ccbs(session_t *);
ccb_t *get_ccb(connection_t *, bool);
void free_ccb(ccb_t *);
void suspend_ccb(ccb_t *, bool);
void wake_ccb(ccb_t *, uint32_t);
void create_pdus(connection_t *);
pdu_t *get_pdu(connection_t *, bool);
void free_pdu(pdu_t *);
void init_sernum(sernum_buffer_t *);
int add_sernum(sernum_buffer_t *, uint32_t);
uint32_t ack_sernum(sernum_buffer_t *, uint32_t);
uint32_t get_sernum(session_t *, pdu_t *);
int sernum_in_window(session_t *);
int window_size(session_t *, int);
/* in iscsi_text.c */
int assemble_login_parameters(connection_t *, ccb_t *, pdu_t *);
int assemble_security_parameters(connection_t *, ccb_t *, pdu_t *, pdu_t *);
int assemble_negotiation_parameters(connection_t *, ccb_t *, pdu_t *, pdu_t *);
int init_text_parameters(connection_t *, ccb_t *);
int assemble_send_targets(pdu_t *, uint8_t *);
void set_negotiated_parameters(ccb_t *);
#endif /* !_ISCSI_GLOBALS_H */