/*	common/target_negotiate.h *  * 	This defines the functions used in the Login phase * 	by the iSCSI target for parameter negotiation * *	vi: set autoindent tabstop=8 shiftwidth=4 : * *	This file contains auxilliary functions for iscsi initiator  *	code that are responsible for dealing with error recovery. * *	Copyright (C) 2001-2003 InterOperability Lab (IOL) *	University of New Hampshier (UNH) *	Durham, NH 03824 * *	This program is free software; you can redistribute it and/or modify *	it under the terms of the GNU General Public License as published by *	the Free Software Foundation; either version 2, or (at your option) *	any later version. * *	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. * *	The name of IOL and/or UNH may not be used to endorse or promote  *	products derived from this software without specific prior  * 	written permission.*/#ifndef	_TARGET_NEGOTIATE_H#define	_TARGET_NEGOTIATE_H#include <asm/semaphore.h>/* names of bit numbers in the iscsi_conn control byte */#define SILENCE_BIT		0#define NEED_NOPIN_BIT		1/* maximum number of unreplied-to NopIns to send to initiator before aborting */#define MAX_OUTSTANDING_NOPINS	4/* maximum number of different IP_address:port listening sockets and threads * (used as size of iscsi_portal_groups[]) */#define MAX_PORTAL	32/* queue item to send a reject pdu back to initiator */struct reject_item {	struct list_head	reject_link;	__u8			bad_header[ISCSI_HDR_LEN];	__u8			reason;};/* global struct to store properties corresponding to an iscsi target */struct iscsi_global{  /* conn_id: id assigned to connections within session */  __u32			conn_id;  /* ntsih: id assigned to target sessions */  __u16			ntsih;  /* Data and Status snack support - SAI */  __u8                  targ_snack_flg;  /* phase-collapse setting - cdeng */  signed char		phase_collapse;    /* session_list: list of sessions */  struct list_head	session_list;  /* bad_session_list: list of sessions that failed during startup */  struct list_head	bad_session_list;  /* session_sem: semaphore to add and remove sessions from both session lists   *	this semaphore also controls access to session->conn_list   */  struct semaphore	session_sem;  /* session_read_mutex: semaphore to read (no changes) both session lists   *	as well as the session->conn_list   */  struct semaphore	session_read_mutex;  /* session_readers: counts number of current readers of the session lists */  __u32			session_readers;  /* server_thr: task struct for the server thread */  struct task_struct	*server_thr[MAX_PORTAL];  /* server_socket: socket on which the server listens */  struct socket		*server_socket[MAX_PORTAL];  /* server_sem: semaphore for killing the server thread */  struct semaphore	server_sem;  /* device: device returned by the STML */  struct STD		*device;  /* force: manageable bits to initialize connection flags */  __u32			force;  /* nop_period: timeout period to send periodic NopIns to initiator */  __u32			nop_period;          /* Added r2t retransmit period - SAI */  __u32			r2t_period;  /* text parameters accepted by the target */  struct parameter_type   (*param_tbl)[MAX_CONFIG_PARAMS];  /* chap parameter - CHONG */  struct auth_parameter_type auth_parameter;};/* stores everything related to an iscsi connection on the target */struct iscsi_conn {	/* conn_link: structure for threading this conn onto lists */	struct list_head conn_link;	/* conn_id: the id for this connection */	int conn_id;	/* cid: connection id assigned by the Initiator */	__u16 cid;	/* portal_group_tag: target_portal_group_tag for the connection */	__u16 portal_group_tag;	/* conn_socket: socket used by this connection */	struct socket *conn_socket;	/* session: what session does this connection belong to */	struct iscsi_session *session;	/* dev: device on which this connection was received */	struct iscsi_global *dev;	/* rx_thread: task struct for rx_thread */	struct task_struct *rx_thread;	/* tx_thread: task struct for tx_thread */	struct task_struct *tx_thread;	/* tx_sem: semaphore to control operation of tx_thread */	struct semaphore tx_sem;	/* semaphores to kill rx and tx threads */	struct semaphore kill_rx_sem;	struct semaphore kill_tx_sem;	/* reject_list: list of rejects to be sent back to initiator */	struct list_head	reject_list;	/* reject_sem: semaphore to add/remove reject items */	struct semaphore reject_sem;	/* bad_hdr: complete header of bad PDU for reject */	__u8 bad_hdr[ISCSI_HDR_LEN];	/* hdr_crc: 1 if header digest in use, else 0 */	int hdr_crc;	/* data_crc: 1 if data digest in use, else 0 */	int data_crc;	/* active: 1 if connection is in use, else 0 */	__u8 active;	/* control: bits to control tx thread wakeups, sending NopIn pings */	unsigned long control;	/* nop_period: timeout period to send periodic NopIns to initiator */	__u32 nop_period;	struct timer_list nop_timer;	/* outstanding_nopins: number of NopIns sent but not yet replied to */	atomic_t outstanding_nopins;	/* connection_flags: bits to control stuff during login and FFP */	__u32 connection_flags;	/* text_in_progress: ptr to text command in-progress, else NULL */	void *text_in_progress;	/* text_in_progress_sem: semaphore to add/remove text_in_progress */	struct semaphore text_in_progress_sem;	/* 	 * Connection WIDE COUNTERS: stat_sn	 */	__u32 stat_sn;	__u32 max_send_length;	/*initiator's MaxRecvPDULength */	__u32 max_recv_length;	/*target's MaxRecvPDULength */	/* fields to keep track of ip addresses */	struct sockaddr *ip_address;	/* initiator's ipv4/ipv6 address */	struct sockaddr *local_ip_address;/* target's ipv4/ipv6 address */};/* stores everything related to an iscsi session on the target */struct iscsi_session {	/* sess_link: structure for threading this session onto lists */	struct list_head sess_link;	/* isid: id assigned to a session by the Initiator */	__u8 isid[6];	/* SNACK flags for Error Recovery - SAI */	__u8 targ_snack_flg;	/* tsih: id assigned to a session by the Target */	__u16 tsih;	/* portal_group_tag: target_portal_group_tag for the session */	__u16 portal_group_tag;	/* cmnd_id: these are the values assigned as target_tags */	__u32 cmnd_id;	/* cmnd_list: list of commands received within session */	struct iscsi_cmnd *cmnd_list;	/* conn_sem: semaphore to add/remove commands and reject items */	struct semaphore cmnd_sem;	/* nconn: no of active connections */	int nconn;	/* conn_list: list of connections within session	 *	access to this list is under protection of the session_sem	 *	it can be read only when session_list is read protected	 *	it can be written only when session_list is write protected	 */	struct list_head conn_list;	/* devdata: pointer to the device specific data */	struct iscsi_global *devdata;	/* Added the r2t retransmit timer - SAI */	__u32 r2t_period;	struct timer_list *r2t_timer;	/* error recovery ver ref18_04 */	struct task_struct *retran_thread;	struct semaphore retran_sem;	struct semaphore thr_kill_sem;	/* For parameters */	struct parameter_type (*session_params)[MAX_CONFIG_PARAMS];	struct session_operational_parameters *oper_param;	/* version identifiers */	__u8 version_min;	__u8 version_max;	__u8 version_active;	/*	 * SESSION WIDE COUNTERS: exp_cmd_sn and max_cmd_sn	 */	__u32 cmd_sn;	__u32 exp_cmd_sn;	__u32 max_cmd_sn;	/* command ordering variables - SAI */	struct semaphore cmd_order_sem;	struct order_cmd *cmd_order_head;	struct order_cmd *cmd_order_tail;};void __attribute__ ((no_instrument_function))print_isid_tsih_message(struct iscsi_session *session, char *message);int parameter_negotiate(struct iscsi_conn *conn,			struct parameter_type p_param_tbl[MAX_CONFIG_PARAMS],			struct iscsi_init_login_cmnd *loginpdu,			__u32 when_called,			struct auth_parameter_type auth_param);/* set back the leading only keys if these keys were set to be * " KEY_TO_BE_NEGOTIATED" in the leading connection negotation.*/void reset_parameter_table(struct parameter_type			   p_param_tbl[MAX_CONFIG_PARAMS]);/* * iscsi_release_session: This function is responsible for closing out * a session and removing it from whatever list it is on. * INPUT: session to be released * OUTPUT: 0 if success, < 0 if there is trouble */intiscsi_release_session(struct iscsi_session *session);#endif