/* $OpenBSD: iscsid.h,v 1.15 2016/08/16 18:41:57 tedu Exp $ */ /* * Copyright (c) 2009 Claudio Jeker * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #define ISCSID_DEVICE "/dev/vscsi0" #define ISCSID_CONTROL "/var/run/iscsid.sock" #define ISCSID_CONFIG "/etc/iscsi.conf" #define ISCSID_USER "_iscsid" #define ISCSID_BASE_NAME "iqn.1995-11.org.openbsd.iscsid" #define ISCSID_DEF_CONNS 8 #define ISCSID_HOLD_TIME_MAX 128 #define PDU_READ_SIZE (256 * 1024) #define CONTROL_READ_SIZE 8192 #define PDU_MAXIOV 5 #define PDU_WRIOV (PDU_MAXIOV * 8) #define PDU_HEADER 0 #define PDU_AHS 1 #define PDU_HDIGEST 2 #define PDU_DATA 3 #define PDU_DDIGEST 4 #define PDU_LEN(x) ((((x) + 3) / 4) * 4) #ifndef nitems #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0])) #endif /* * Common control message header. * A message can consist of up to 3 parts with specified length. */ struct ctrlmsghdr { u_int16_t type; u_int16_t len[3]; }; struct ctrldata { void *buf; size_t len; }; #define CTRLARGV(x...) ((struct ctrldata []){ x }) /* Control message types */ #define CTRL_SUCCESS 1 #define CTRL_FAILURE 2 #define CTRL_INPROGRESS 3 #define CTRL_INITIATOR_CONFIG 4 #define CTRL_SESSION_CONFIG 5 #define CTRL_LOG_VERBOSE 6 #define CTRL_VSCSI_STATS 7 #define CTRL_SHOW_SUM 8 TAILQ_HEAD(session_head, session); TAILQ_HEAD(connection_head, connection); TAILQ_HEAD(pduq, pdu); TAILQ_HEAD(taskq, task); /* as in tcp_seq.h */ #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) #define SESS_INIT 0x0001 #define SESS_FREE 0x0002 #define SESS_LOGGED_IN 0x0004 #define SESS_FAILED 0x0008 #define SESS_ANYSTATE 0xffff #define SESS_RUNNING (SESS_FREE | SESS_LOGGED_IN | SESS_FAILED) #define CONN_FREE 0x0001 /* S1 = R3 */ #define CONN_XPT_WAIT 0x0002 /* S2 */ #define CONN_XPT_UP 0x0004 /* S3 */ #define CONN_IN_LOGIN 0x0008 /* S4 */ #define CONN_LOGGED_IN 0x0010 /* S5 */ #define CONN_IN_LOGOUT 0x0020 /* S6 */ #define CONN_LOGOUT_REQ 0x0040 /* S7 */ #define CONN_CLEANUP_WAIT 0x0080 /* S8 = R1 */ #define CONN_IN_CLEANUP 0x0100 /* R2 */ #define CONN_ANYSTATE 0xffff #define CONN_RUNNING (CONN_LOGGED_IN | CONN_LOGOUT_REQ) #define CONN_FAILED (CONN_CLEANUP_WAIT | CONN_IN_CLEANUP) #define CONN_NEVER_LOGGED_IN (CONN_FREE | CONN_XPT_WAIT | CONN_XPT_UP | \ CONN_IN_LOGIN) enum c_event { CONN_EV_FAIL, CONN_EV_FREE, CONN_EV_CONNECT, CONN_EV_CONNECTED, CONN_EV_LOGGED_IN, CONN_EV_REQ_LOGOUT, CONN_EV_LOGOUT, CONN_EV_LOGGED_OUT, CONN_EV_CLOSED, CONN_EV_CLEANING_UP }; enum s_event { SESS_EV_START, SESS_EV_STOP, SESS_EV_CONN_LOGGED_IN, SESS_EV_CONN_FAIL, SESS_EV_CONN_CLOSED, SESS_EV_REINSTATEMENT, SESS_EV_TIMEOUT, SESS_EV_CLOSED, SESS_EV_FAIL, SESS_EV_FREE }; #define SESS_ACT_UP 0 #define SESS_ACT_DOWN 1 struct pdu { TAILQ_ENTRY(pdu) entry; struct iovec iov[PDU_MAXIOV]; size_t resid; }; struct pdu_readbuf { char *buf; size_t size; size_t rpos; size_t wpos; struct pdu *wip; }; struct connection_config { /* values inherited from session_config */ struct sockaddr_storage TargetAddr; /* IP:port of target */ struct sockaddr_storage LocalAddr; /* IP:port of target */ }; struct initiator_config { u_int32_t isid_base; /* only 24 bits */ u_int16_t isid_qual; u_int16_t pad; }; struct session_config { /* unique session ID */ char SessionName[32]; /* * I = initialize only, L = leading only * S = session wide, C = connection only */ struct connection_config connection; char *TargetName; /* String: IS */ char *InitiatorName; /* String: IS */ u_int16_t MaxConnections; /* 1, 1-65535 (min()): LS */ u_int8_t HeaderDigest; /* None , (None|CRC32): IC */ u_int8_t DataDigest; /* None , (None|CRC32): IC */ u_int8_t SessionType; /* Normal, (Discovery|Normal): LS */ u_int8_t disabled; }; #define SESSION_TYPE_NORMAL 0 #define SESSION_TYPE_DISCOVERY 1 struct session_params { u_int32_t MaxBurstLength; /* 262144, 512-to-(2**24-1) (min()): LS */ u_int32_t FirstBurstLength; /* 65536, 512-to-(2**24-1) (min()): LS */ u_int16_t DefaultTime2Wait; /* 2, 0-to-3600 (max()): LS */ u_int16_t DefaultTime2Retain; /* 20, 0-to-3600 (min()): LS */ u_int16_t MaxOutstandingR2T; /* 1, 1-to-65535 (min()): LS */ u_int16_t TargetPortalGroupTag; /* 1- 65535: IS */ u_int16_t MaxConnections; /* 1, 1-65535 (min()): LS */ u_int8_t InitialR2T; /* yes, bool (||): LS */ u_int8_t ImmediateData; /* yes, bool (&&): LS */ u_int8_t DataPDUInOrder; /* yes, bool (||): LS */ u_int8_t DataSequenceInOrder; /* yes, bool (||): LS */ u_int8_t ErrorRecoveryLevel; /* 0, 0 - 2 (min()): LS */ }; struct connection_params { u_int32_t MaxRecvDataSegmentLength; /* 8192, 512-to-(2**24-1): C */ /* inherited from session_config */ u_int8_t HeaderDigest; u_int8_t DataDigest; }; struct initiator { struct session_head sessions; struct initiator_config config; u_int target; }; struct sessev { struct session *sess; struct connection *conn; enum s_event event; }; struct session { TAILQ_ENTRY(session) entry; struct connection_head connections; struct taskq tasks; struct session_config config; struct session_params mine; struct session_params his; struct session_params active; struct initiator *initiator; u_int32_t cmdseqnum; u_int32_t itt; u_int32_t isid_base; /* only 24 bits */ u_int16_t isid_qual; /* inherited from initiator */ u_int16_t tsih; /* target session id handle */ u_int target; int holdTimer; /* internal hold timer */ int state; int action; }; struct connection { struct event ev; struct event wev; TAILQ_ENTRY(connection) entry; struct connection_params mine; struct connection_params his; struct connection_params active; struct connection_config config; struct pdu_readbuf prbuf; struct pduq pdu_w; struct taskq tasks; struct session *session; u_int32_t expstatsn; int state; int fd; u_int16_t cid; /* conection id */ }; struct task { TAILQ_ENTRY(task) entry; struct pduq sendq; struct pduq recvq; void *callarg; void (*callback)(struct connection *, void *, struct pdu *); void (*failback)(void *); u_int32_t cmdseqnum; u_int32_t itt; u_int8_t pending; }; struct kvp { char *key; char *value; long flags; }; #define KVP_KEY_ALLOCED 0x01 #define KVP_VALUE_ALLOCED 0x02 struct vscsi_stats { u_int64_t bytes_rd; u_int64_t bytes_wr; u_int64_t cnt_read; u_int64_t cnt_write; u_int64_t cnt_i2t; u_int64_t cnt_i2t_dir[3]; u_int64_t cnt_t2i; u_int64_t cnt_t2i_status[3]; u_int32_t cnt_probe; u_int32_t cnt_detach; }; extern const struct session_params iscsi_sess_defaults; extern const struct connection_params iscsi_conn_defaults; extern struct session_params initiator_sess_defaults; extern struct connection_params initiator_conn_defaults; void iscsid_ctrl_dispatch(void *, struct pdu *); void iscsi_merge_sess_params(struct session_params *, struct session_params *, struct session_params *); void iscsi_merge_conn_params(struct connection_params *, struct connection_params *, struct connection_params *); struct initiator *initiator_init(void); void initiator_cleanup(struct initiator *); void initiator_shutdown(struct initiator *); int initiator_isdown(struct initiator *); struct session *initiator_t2s(u_int); void initiator_login(struct connection *); void initiator_discovery(struct session *); void initiator_logout(struct session *, struct connection *, u_int8_t); void initiator_nop_in_imm(struct connection *, struct pdu *); char *default_initiator_name(void); int control_init(char *); void control_cleanup(char *); void control_event_init(void); void control_queue(void *, struct pdu *); int control_compose(void *, u_int16_t, void *, size_t); int control_build(void *, u_int16_t, int, struct ctrldata *); struct session *session_find(struct initiator *, char *); struct session *session_new(struct initiator *, u_int8_t); void session_cleanup(struct session *); int session_shutdown(struct session *); void session_config(struct session *, struct session_config *); void session_task_issue(struct session *, struct task *); void session_logout_issue(struct session *, struct task *); void session_schedule(struct session *); void session_task_login(struct connection *); void session_fsm(struct session *, enum s_event, struct connection *, unsigned int); void conn_new(struct session *, struct connection_config *); void conn_free(struct connection *); int conn_task_ready(struct connection *); void conn_task_issue(struct connection *, struct task *); void conn_task_schedule(struct connection *); void conn_task_cleanup(struct connection *, struct task *); int conn_parse_kvp(struct connection *, struct kvp *); int conn_gen_kvp(struct connection *, struct kvp *, size_t *); void conn_pdu_write(struct connection *, struct pdu *); void conn_fail(struct connection *); void conn_fsm(struct connection *, enum c_event); void *pdu_gethdr(struct pdu *); int text_to_pdu(struct kvp *, struct pdu *); struct kvp *pdu_to_text(char *, size_t); u_int64_t text_to_num(const char *, u_int64_t, u_int64_t, const char **); int text_to_bool(const char *, const char **); void pdu_free_queue(struct pduq *); ssize_t pdu_read(struct connection *); ssize_t pdu_write(struct connection *); int pdu_pending(struct connection *); void pdu_parse(struct connection *); int pdu_readbuf_set(struct pdu_readbuf *, size_t); void pdu_readbuf_free(struct pdu_readbuf *); struct pdu *pdu_new(void); void *pdu_alloc(size_t); void *pdu_dup(void *, size_t); int pdu_addbuf(struct pdu *, void *, size_t, unsigned int); void *pdu_getbuf(struct pdu *, size_t *, unsigned int); void pdu_free(struct pdu *); int socket_setblockmode(int, int); const char *log_sockaddr(void *); void task_init(struct task *, struct session *, int, void *, void (*)(struct connection *, void *, struct pdu *), void (*)(void *)); void taskq_cleanup(struct taskq *); void task_pdu_add(struct task *, struct pdu *); void task_pdu_cb(struct connection *, struct pdu *); void vscsi_open(char *); void vscsi_dispatch(int, short, void *); void vscsi_data(unsigned long, int, void *, size_t); void vscsi_status(int, int, void *, size_t); void vscsi_event(unsigned long, u_int, u_int); struct vscsi_stats *vscsi_stats(void);