/* * iSCSI transport class definitions * * Copyright (C) IBM Corporation, 2004 * Copyright (C) Mike Christie, 2004 - 2005 * Copyright (C) Dmitry Yusupov, 2004 - 2005 * Copyright (C) Alex Aizman, 2004 - 2005 * * 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 of the License, 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. */ #include <linux/module.h> #include <linux/mutex.h> #include <net/tcp.h> #include <scsi/scsi.h> #include <scsi/scsi_host.h> #include <scsi/scsi_device.h> #include <scsi/scsi_transport.h> #include <scsi/scsi_transport_iscsi.h> #include <scsi/iscsi_if.h> #define ISCSI_SESSION_ATTRS 11 #define ISCSI_CONN_ATTRS 11 #define ISCSI_HOST_ATTRS 0 #define ISCSI_TRANSPORT_VERSION "2.0-724" struct iscsi_internal { int daemon_pid; struct scsi_transport_template t; struct iscsi_transport *iscsi_transport; struct list_head list; struct class_device cdev; struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; struct transport_container conn_cont; struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; struct transport_container session_cont; struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; }; static int iscsi_session_nr; /* sysfs session id for next new session */ /* * list of registered transports and lock that must * be held while accessing list. The iscsi_transport_lock must * be acquired after the rx_queue_mutex. */ static LIST_HEAD(iscsi_transports); static DEFINE_SPINLOCK(iscsi_transport_lock); #define to_iscsi_internal(tmpl) \ container_of(tmpl, struct iscsi_internal, t) #define cdev_to_iscsi_internal(_cdev) \ container_of(_cdev, struct iscsi_internal, cdev) static void iscsi_transport_release(struct class_device *cdev) { struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); kfree(priv); } /* * iscsi_transport_class represents the iscsi_transports that are * registered. */ static struct class iscsi_transport_class = { .name = "iscsi_transport", .release = iscsi_transport_release, }; static ssize_t show_transport_handle(struct class_device *cdev, char *buf) { struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); } static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); #define show_transport_attr(name, format) \ static ssize_t \ show_transport_##name(struct class_device *cdev, char *buf) \ { \ struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ return sprintf(buf, format"\n", priv->iscsi_transport->name); \ } \ static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); show_transport_attr(caps, "0x%x"); show_transport_attr(max_lun, "%d"); show_transport_attr(max_conn, "%d"); show_transport_attr(max_cmd_len, "%d"); static struct attribute *iscsi_transport_attrs[] = { &class_device_attr_handle.attr, &class_device_attr_caps.attr, &class_device_attr_max_lun.attr, &class_device_attr_max_conn.attr, &class_device_attr_max_cmd_len.attr, NULL, }; static struct attribute_group iscsi_transport_group = { .attrs = iscsi_transport_attrs, }; static int iscsi_setup_host(struct transport_container *tc, struct device *dev, struct class_device *cdev) { struct Scsi_Host *shost = dev_to_shost(dev); struct iscsi_host *ihost = shost->shost_data; memset(ihost, 0, sizeof(*ihost)); INIT_LIST_HEAD(&ihost->sessions); mutex_init(&ihost->mutex); return 0; } static DECLARE_TRANSPORT_CLASS(iscsi_host_class, "iscsi_host", iscsi_setup_host, NULL, NULL); static DECLARE_TRANSPORT_CLASS(iscsi_session_class, "iscsi_session", NULL, NULL, NULL); static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, "iscsi_connection", NULL, NULL, NULL); static struct sock *nls; static DEFINE_MUTEX(rx_queue_mutex); static LIST_HEAD(sesslist); static DEFINE_SPINLOCK(sesslock); static LIST_HEAD(connlist); static DEFINE_SPINLOCK(connlock); static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) { struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); return sess->sid; } /* * Returns the matching session to a given sid */ static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) { unsigned long flags; struct iscsi_cls_session *sess; spin_lock_irqsave(&sesslock, flags); list_for_each_entry(sess, &sesslist, sess_list) { if (sess->sid == sid) { spin_unlock_irqrestore(&sesslock, flags); return sess; } } spin_unlock_irqrestore(&sesslock, flags); return NULL; } /* * Returns the matching connection to a given sid / cid tuple */ static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) { unsigned long flags; struct iscsi_cls_conn *conn; spin_lock_irqsave(&connlock, flags); list_for_each_entry(conn, &connlist, conn_list) { if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { spin_unlock_irqrestore(&connlock, flags); return conn; } } spin_unlock_irqrestore(&connlock, flags); return NULL; } /* * The following functions can be used by LLDs that allocate * their own scsi_hosts or by software iscsi LLDs */ static void iscsi_session_release(struct device *dev) { struct iscsi_cls_session *session = iscsi_dev_to_session(dev); struct Scsi_Host *shost; shost = iscsi_session_to_shost(session); scsi_host_put(shost); kfree(session); } static int iscsi_is_session_dev(const struct device *dev) { return dev->release == iscsi_session_release; } static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun) { struct iscsi_host *ihost = shost->shost_data; struct iscsi_cls_session *session; mutex_lock(&ihost->mutex); list_for_each_entry(session, &ihost->sessions, host_list) { if ((channel == SCAN_WILD_CARD || channel == 0) && (id == SCAN_WILD_CARD || id == session->target_id)) scsi_scan_target(&session->dev, 0, session->target_id, lun, 1); } mutex_unlock(&ihost->mutex); return 0; } static void session_recovery_timedout(struct work_struct *work) { struct iscsi_cls_session *session = container_of(work, struct iscsi_cls_session, recovery_work.work); dev_printk(KERN_INFO, &session->dev, "iscsi: session recovery timed " "out after %d secs\n", session->recovery_tmo); if (session->transport->session_recovery_timedout) session->transport->session_recovery_timedout(session); scsi_target_unblock(&session->dev); } void iscsi_unblock_session(struct iscsi_cls_session *session) { if (!cancel_delayed_work(&session->recovery_work)) flush_scheduled_work(); scsi_target_unblock(&session->dev); } EXPORT_SYMBOL_GPL(iscsi_unblock_session); void iscsi_block_session(struct iscsi_cls_session *session) { scsi_target_block(&session->dev); schedule_delayed_work(&session->recovery_work, session->recovery_tmo * HZ); } EXPORT_SYMBOL_GPL(iscsi_block_session); struct iscsi_cls_session * iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport) { struct iscsi_cls_session *session; session = kzalloc(sizeof(*session) + transport->sessiondata_size, GFP_KERNEL); if (!session) return NULL; session->transport = transport; session->recovery_tmo = 120; INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout); INIT_LIST_HEAD(&session->host_list); INIT_LIST_HEAD(&session->sess_list); /* this is released in the dev's release function */ scsi_host_get(shost); session->dev.parent = &shost->shost_gendev; session->dev.release = iscsi_session_release; device_initialize(&session->dev); if (transport->sessiondata_size) session->dd_data = &session[1]; return session; } EXPORT_SYMBOL_GPL(iscsi_alloc_session); int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) { struct Scsi_Host *shost = iscsi_session_to_shost(session); struct iscsi_host *ihost; int err; ihost = shost->shost_data; session->sid = iscsi_session_nr++; session->target_id = target_id; snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", session->sid); err = device_add(&session->dev); if (err) { dev_printk(KERN_ERR, &session->dev, "iscsi: could not " "register session's dev\n"); goto release_host; } transport_register_device(&session->dev); mutex_lock(&ihost->mutex); list_add(&session->host_list, &ihost->sessions); mutex_unlock(&ihost->mutex); return 0; release_host: scsi_host_put(shost); return err; } EXPORT_SYMBOL_GPL(iscsi_add_session); /** * iscsi_create_session - create iscsi class session * @shost: scsi host * @transport: iscsi transport * * This can be called from a LLD or iscsi_transport. **/ struct iscsi_cls_session * iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport, unsigned int target_id) { struct iscsi_cls_session *session; session = iscsi_alloc_session(shost, transport); if (!session) return NULL; if (iscsi_add_session(session, target_id)) { iscsi_free_session(session); return NULL; } return session; } EXPORT_SYMBOL_GPL(iscsi_create_session); void iscsi_remove_session(struct iscsi_cls_session *session) { struct Scsi_Host *shost = iscsi_session_to_shost(session); struct iscsi_host *ihost = shost->shost_data; if (!cancel_delayed_work(&session->recovery_work)) flush_scheduled_work(); mutex_lock(&ihost->mutex); list_del(&session->host_list); mutex_unlock(&ihost->mutex); scsi_remove_target(&session->dev); transport_unregister_device(&session->dev); device_del(&session->dev); } EXPORT_SYMBOL_GPL(iscsi_remove_session); void iscsi_free_session(struct iscsi_cls_session *session) { put_device(&session->dev); } EXPORT_SYMBOL_GPL(iscsi_free_session); /** * iscsi_destroy_session - destroy iscsi session * @session: iscsi_session * * Can be called by a LLD or iscsi_transport. There must not be * any running connections. **/ int iscsi_destroy_session(struct iscsi_cls_session *session) { iscsi_remove_session(session); iscsi_free_session(session); return 0; } EXPORT_SYMBOL_GPL(iscsi_destroy_session); static void iscsi_conn_release(struct device *dev) { struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); struct device *parent = conn->dev.parent; kfree(conn); put_device(parent); } static int iscsi_is_conn_dev(const struct device *dev) { return dev->release == iscsi_conn_release; } /** * iscsi_create_conn - create iscsi class connection * @session: iscsi cls session * @cid: connection id * * This can be called from a LLD or iscsi_transport. The connection * is child of the session so cid must be unique for all connections * on the session. * * Since we do not support MCS, cid will normally be zero. In some cases * for software iscsi we could be trying to preallocate a connection struct * in which case there could be two connection structs and cid would be * non-zero. **/ struct iscsi_cls_conn * iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) { struct iscsi_transport *transport = session->transport; struct iscsi_cls_conn *conn; int err; conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); if (!conn) return NULL; if (transport->conndata_size) conn->dd_data = &conn[1]; INIT_LIST_HEAD(&conn->conn_list); conn->transport = transport; conn->cid = cid; /* this is released in the dev's release function */ if (!get_device(&session->dev)) goto free_conn; snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", session->sid, cid); conn->dev.parent = &session->dev; conn->dev.release = iscsi_conn_release; err = device_register(&conn->dev); if (err) { dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " "connection's dev\n"); goto release_parent_ref; } transport_register_device(&conn->dev); return conn; release_parent_ref: put_device(&session->dev); free_conn: kfree(conn); return NULL; } EXPORT_SYMBOL_GPL(iscsi_create_conn); /** * iscsi_destroy_conn - destroy iscsi class connection * @session: iscsi cls session * * This can be called from a LLD or iscsi_transport. **/ int iscsi_destroy_conn(struct iscsi_cls_conn *conn) { transport_unregister_device(&conn->dev); device_unregister(&conn->dev); return 0; } EXPORT_SYMBOL_GPL(iscsi_destroy_conn); /* * iscsi interface functions */ static struct iscsi_internal * iscsi_if_transport_lookup(struct iscsi_transport *tt) { struct iscsi_internal *priv; unsigned long flags; spin_lock_irqsave(&iscsi_transport_lock, flags); list_for_each_entry(priv, &iscsi_transports, list) { if (tt == priv->iscsi_transport) { spin_unlock_irqrestore(&iscsi_transport_lock, flags); return priv; } } spin_unlock_irqrestore(&iscsi_transport_lock, flags); return NULL; } static int iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp) { int rc; rc = netlink_broadcast(nls, skb, 0, 1, gfp); if (rc < 0) { printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc); return rc; } return 0; } static int iscsi_unicast_skb(struct sk_buff *skb, int pid) { int rc; rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); if (rc < 0) { printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); return rc; } return 0; } int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, char *data, uint32_t data_size) { struct nlmsghdr *nlh; struct sk_buff *skb; struct iscsi_uevent *ev; char *pdu; struct iscsi_internal *priv; int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + data_size); priv = iscsi_if_transport_lookup(conn->transport); if (!priv) return -EINVAL; skb = alloc_skb(len, GFP_ATOMIC); if (!skb) { iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " "control PDU: OOM\n"); return -ENOMEM; } nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); ev = NLMSG_DATA(nlh); memset(ev, 0, sizeof(*ev)); ev->transport_handle = iscsi_handle(conn->transport); ev->type = ISCSI_KEVENT_RECV_PDU; ev->r.recv_req.cid = conn->cid; ev->r.recv_req.sid = iscsi_conn_get_sid(conn); pdu = (char*)ev + sizeof(*ev); memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); return iscsi_unicast_skb(skb, priv->daemon_pid); } EXPORT_SYMBOL_GPL(iscsi_recv_pdu); void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) { struct nlmsghdr *nlh; struct sk_buff *skb; struct iscsi_uevent *ev; struct iscsi_internal *priv; int len = NLMSG_SPACE(sizeof(*ev)); priv = iscsi_if_transport_lookup(conn->transport); if (!priv) return; skb = alloc_skb(len, GFP_ATOMIC); if (!skb) { dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " "conn error (%d)\n", error); return; } nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); ev = NLMSG_DATA(nlh); ev->transport_handle = iscsi_handle(conn->transport); ev->type = ISCSI_KEVENT_CONN_ERROR; ev->r.connerror.error = error; ev->r.connerror.cid = conn->cid; ev->r.connerror.sid = iscsi_conn_get_sid(conn); iscsi_broadcast_skb(skb, GFP_ATOMIC); dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", error); } EXPORT_SYMBOL_GPL(iscsi_conn_error); static int iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, void *payload, int size) { struct sk_buff *skb; struct nlmsghdr *nlh; int len = NLMSG_SPACE(size); int flags = multi ? NLM_F_MULTI : 0; int t = done ? NLMSG_DONE : type; skb = alloc_skb(len, GFP_ATOMIC); /* * FIXME: * user is supposed to react on iferror == -ENOMEM; * see iscsi_if_rx(). */ BUG_ON(!skb); nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); nlh->nlmsg_flags = flags; memcpy(NLMSG_DATA(nlh), payload, size); return iscsi_unicast_skb(skb, pid); } static int iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) { struct iscsi_uevent *ev = NLMSG_DATA(nlh); struct iscsi_stats *stats; struct sk_buff *skbstat; struct iscsi_cls_conn *conn; struct nlmsghdr *nlhstat; struct iscsi_uevent *evstat; struct iscsi_internal *priv; int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_stats) + sizeof(struct iscsi_stats_custom) * ISCSI_STATS_CUSTOM_MAX); int err = 0; priv = iscsi_if_transport_lookup(transport); if (!priv) return -EINVAL; conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); if (!conn) return -EEXIST; do { int actual_size; skbstat = alloc_skb(len, GFP_ATOMIC); if (!skbstat) { dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " "deliver stats: OOM\n"); return -ENOMEM; } nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, (len - sizeof(*nlhstat)), 0); evstat = NLMSG_DATA(nlhstat); memset(evstat, 0, sizeof(*evstat)); evstat->transport_handle = iscsi_handle(conn->transport); evstat->type = nlh->nlmsg_type; evstat->u.get_stats.cid = ev->u.get_stats.cid; evstat->u.get_stats.sid = ev->u.get_stats.sid; stats = (struct iscsi_stats *) ((char*)evstat + sizeof(*evstat)); memset(stats, 0, sizeof(*stats)); transport->get_stats(conn, stats); actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + sizeof(struct iscsi_stats) + sizeof(struct iscsi_stats_custom) * stats->custom_length); actual_size -= sizeof(*nlhstat); actual_size = NLMSG_LENGTH(actual_size); skb_trim(skbstat, NLMSG_ALIGN(actual_size)); nlhstat->nlmsg_len = actual_size; err = iscsi_unicast_skb(skbstat, priv->daemon_pid); } while (err < 0 && err != -ECONNREFUSED); return err; } /** * iscsi_if_destroy_session_done - send session destr. completion event * @conn: last connection for session * * This is called by HW iscsi LLDs to notify userpsace that its HW has * removed a session. **/ int iscsi_if_destroy_session_done(struct iscsi_cls_conn *conn) { struct iscsi_internal *priv; struct iscsi_cls_session *session; struct Scsi_Host *shost; struct iscsi_uevent *ev; struct sk_buff *skb; struct nlmsghdr *nlh; unsigned long flags; int rc, len = NLMSG_SPACE(sizeof(*ev)); priv = iscsi_if_transport_lookup(conn->transport); if (!priv) return -EINVAL; session = iscsi_dev_to_session(conn->dev.parent); shost = iscsi_session_to_shost(session); skb = alloc_skb(len, GFP_KERNEL); if (!skb) { dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " "session creation event\n"); return -ENOMEM; } nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); ev = NLMSG_DATA(nlh); ev->transport_handle = iscsi_handle(conn->transport); ev->type = ISCSI_KEVENT_DESTROY_SESSION; ev->r.d_session.host_no = shost->host_no; ev->r.d_session.sid = session->sid; /* * this will occur if the daemon is not up, so we just warn * the user and when the daemon is restarted it will handle it */ rc = iscsi_broadcast_skb(skb, GFP_KERNEL); if (rc < 0) dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " "session destruction event. Check iscsi daemon\n"); spin_lock_irqsave(&sesslock, flags); list_del(&session->sess_list); spin_unlock_irqrestore(&sesslock, flags); spin_lock_irqsave(&connlock, flags); conn->active = 0; list_del(&conn->conn_list); spin_unlock_irqrestore(&connlock, flags); return rc; } EXPORT_SYMBOL_GPL(iscsi_if_destroy_session_done); /** * iscsi_if_create_session_done - send session creation completion event * @conn: leading connection for session * * This is called by HW iscsi LLDs to notify userpsace that its HW has * created a session or a existing session is back in the logged in state. **/ int iscsi_if_create_session_done(struct iscsi_cls_conn *conn) { struct iscsi_internal *priv; struct iscsi_cls_session *session; struct Scsi_Host *shost; struct iscsi_uevent *ev; struct sk_buff *skb; struct nlmsghdr *nlh; unsigned long flags; int rc, len = NLMSG_SPACE(sizeof(*ev)); priv = iscsi_if_transport_lookup(conn->transport); if (!priv) return -EINVAL; session = iscsi_dev_to_session(conn->dev.parent); shost = iscsi_session_to_shost(session); skb = alloc_skb(len, GFP_KERNEL); if (!skb) { dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " "session creation event\n"); return -ENOMEM; } nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); ev = NLMSG_DATA(nlh); ev->transport_handle = iscsi_handle(conn->transport); ev->type = ISCSI_UEVENT_CREATE_SESSION; ev->r.c_session_ret.host_no = shost->host_no; ev->r.c_session_ret.sid = session->sid; /* * this will occur if the daemon is not up, so we just warn * the user and when the daemon is restarted it will handle it */ rc = iscsi_broadcast_skb(skb, GFP_KERNEL); if (rc < 0) dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " "session creation event. Check iscsi daemon\n"); spin_lock_irqsave(&sesslock, flags); list_add(&session->sess_list, &sesslist); spin_unlock_irqrestore(&sesslock, flags); spin_lock_irqsave(&connlock, flags); list_add(&conn->conn_list, &connlist); conn->active = 1; spin_unlock_irqrestore(&connlock, flags); return rc; } EXPORT_SYMBOL_GPL(iscsi_if_create_session_done); static int iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) { struct iscsi_transport *transport = priv->iscsi_transport; struct iscsi_cls_session *session; unsigned long flags; uint32_t hostno; session = transport->create_session(transport, &priv->t, ev->u.c_session.initial_cmdsn, &hostno); if (!session) return -ENOMEM; spin_lock_irqsave(&sesslock, flags); list_add(&session->sess_list, &sesslist); spin_unlock_irqrestore(&sesslock, flags); ev->r.c_session_ret.host_no = hostno; ev->r.c_session_ret.sid = session->sid; return 0; } static int iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) { struct iscsi_cls_conn *conn; struct iscsi_cls_session *session; unsigned long flags; session = iscsi_session_lookup(ev->u.c_conn.sid); if (!session) { printk(KERN_ERR "iscsi: invalid session %d\n", ev->u.c_conn.sid); return -EINVAL; } conn = transport->create_conn(session, ev->u.c_conn.cid); if (!conn) { printk(KERN_ERR "iscsi: couldn't create a new " "connection for session %d\n", session->sid); return -ENOMEM; } ev->r.c_conn_ret.sid = session->sid; ev->r.c_conn_ret.cid = conn->cid; spin_lock_irqsave(&connlock, flags); list_add(&conn->conn_list, &connlist); conn->active = 1; spin_unlock_irqrestore(&connlock, flags); return 0; } static int iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) { unsigned long flags; struct iscsi_cls_conn *conn; conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); if (!conn) return -EINVAL; spin_lock_irqsave(&connlock, flags); conn->active = 0; list_del(&conn->conn_list); spin_unlock_irqrestore(&connlock, flags); if (transport->destroy_conn) transport->destroy_conn(conn); return 0; } static int iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) { char *data = (char*)ev + sizeof(*ev); struct iscsi_cls_conn *conn; struct iscsi_cls_session *session; int err = 0, value = 0; session = iscsi_session_lookup(ev->u.set_param.sid); conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); if (!conn || !session) return -EINVAL; switch (ev->u.set_param.param) { case ISCSI_PARAM_SESS_RECOVERY_TMO: sscanf(data, "%d", &value); if (value != 0) session->recovery_tmo = value; break; default: err = transport->set_param(conn, ev->u.set_param.param, data, ev->u.set_param.len); } return err; } static int iscsi_if_transport_ep(struct iscsi_transport *transport, struct iscsi_uevent *ev, int msg_type) { struct sockaddr *dst_addr; int rc = 0; switch (msg_type) { case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: if (!transport->ep_connect) return -EINVAL; dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); rc = transport->ep_connect(dst_addr, ev->u.ep_connect.non_blocking, &ev->r.ep_connect_ret.handle); break; case ISCSI_UEVENT_TRANSPORT_EP_POLL: if (!transport->ep_poll) return -EINVAL; ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, ev->u.ep_poll.timeout_ms); break; case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: if (!transport->ep_disconnect) return -EINVAL; transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); break; } return rc; } static int iscsi_tgt_dscvr(struct iscsi_transport *transport, struct iscsi_uevent *ev) { struct sockaddr *dst_addr; if (!transport->tgt_dscvr) return -EINVAL; dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); return transport->tgt_dscvr(ev->u.tgt_dscvr.type, ev->u.tgt_dscvr.host_no, ev->u.tgt_dscvr.enable, dst_addr); } static int iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) { int err = 0; struct iscsi_uevent *ev = NLMSG_DATA(nlh); struct iscsi_transport *transport = NULL; struct iscsi_internal *priv; struct iscsi_cls_session *session; struct iscsi_cls_conn *conn; unsigned long flags; priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); if (!priv) return -EINVAL; transport = priv->iscsi_transport; if (!try_module_get(transport->owner)) return -EINVAL; priv->daemon_pid = NETLINK_CREDS(skb)->pid; switch (nlh->nlmsg_type) { case ISCSI_UEVENT_CREATE_SESSION: err = iscsi_if_create_session(priv, ev); break; case ISCSI_UEVENT_DESTROY_SESSION: session = iscsi_session_lookup(ev->u.d_session.sid); if (session) { spin_lock_irqsave(&sesslock, flags); list_del(&session->sess_list); spin_unlock_irqrestore(&sesslock, flags); transport->destroy_session(session); } else err = -EINVAL; break; case ISCSI_UEVENT_CREATE_CONN: err = iscsi_if_create_conn(transport, ev); break; case ISCSI_UEVENT_DESTROY_CONN: err = iscsi_if_destroy_conn(transport, ev); break; case ISCSI_UEVENT_BIND_CONN: session = iscsi_session_lookup(ev->u.b_conn.sid); conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); if (session && conn) ev->r.retcode = transport->bind_conn(session, conn, ev->u.b_conn.transport_eph, ev->u.b_conn.is_leading); else err = -EINVAL; break; case ISCSI_UEVENT_SET_PARAM: err = iscsi_set_param(transport, ev); break; case ISCSI_UEVENT_START_CONN: conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); if (conn) ev->r.retcode = transport->start_conn(conn); else err = -EINVAL; break; case ISCSI_UEVENT_STOP_CONN: conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); if (conn) transport->stop_conn(conn, ev->u.stop_conn.flag); else err = -EINVAL; break; case ISCSI_UEVENT_SEND_PDU: conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); if (conn) ev->r.retcode = transport->send_pdu(conn, (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, ev->u.send_pdu.data_size); else err = -EINVAL; break; case ISCSI_UEVENT_GET_STATS: err = iscsi_if_get_stats(transport, nlh); break; case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: case ISCSI_UEVENT_TRANSPORT_EP_POLL: case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); break; case ISCSI_UEVENT_TGT_DSCVR: err = iscsi_tgt_dscvr(transport, ev); break; default: err = -EINVAL; break; } module_put(transport->owner); return err; } /* * Get message from skb (based on rtnetlink_rcv_skb). Each message is * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or * invalid creds are discarded silently. */ static void iscsi_if_rx(struct sock *sk, int len) { struct sk_buff *skb; mutex_lock(&rx_queue_mutex); while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { if (NETLINK_CREDS(skb)->uid) { skb_pull(skb, skb->len); goto free_skb; } while (skb->len >= NLMSG_SPACE(0)) { int err; uint32_t rlen; struct nlmsghdr *nlh; struct iscsi_uevent *ev; nlh = (struct nlmsghdr *)skb->data; if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) { break; } ev = NLMSG_DATA(nlh); rlen = NLMSG_ALIGN(nlh->nlmsg_len); if (rlen > skb->len) rlen = skb->len; err = iscsi_if_recv_msg(skb, nlh); if (err) { ev->type = ISCSI_KEVENT_IF_ERROR; ev->iferror = err; } do { /* * special case for GET_STATS: * on success - sending reply and stats from * inside of if_recv_msg(), * on error - fall through. */ if (ev->type == ISCSI_UEVENT_GET_STATS && !err) break; err = iscsi_if_send_reply( NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); } while (err < 0 && err != -ECONNREFUSED); skb_pull(skb, rlen); } free_skb: kfree_skb(skb); } mutex_unlock(&rx_queue_mutex); } #define iscsi_cdev_to_conn(_cdev) \ iscsi_dev_to_conn(_cdev->dev) #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ struct class_device_attribute class_device_attr_##_prefix##_##_name = \ __ATTR(_name,_mode,_show,_store) /* * iSCSI connection attrs */ #define iscsi_conn_attr_show(param) \ static ssize_t \ show_conn_param_##param(struct class_device *cdev, char *buf) \ { \ struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ struct iscsi_transport *t = conn->transport; \ return t->get_conn_param(conn, param, buf); \ } #define iscsi_conn_attr(field, param) \ iscsi_conn_attr_show(param) \ static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ NULL); iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); #define iscsi_cdev_to_session(_cdev) \ iscsi_dev_to_session(_cdev->dev) /* * iSCSI session attrs */ #define iscsi_session_attr_show(param) \ static ssize_t \ show_session_param_##param(struct class_device *cdev, char *buf) \ { \ struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ struct iscsi_transport *t = session->transport; \ return t->get_session_param(session, param, buf); \ } #define iscsi_session_attr(field, param) \ iscsi_session_attr_show(param) \ static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ NULL); iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME); iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN); iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST); iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST); iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN); iscsi_session_attr(erl, ISCSI_PARAM_ERL); iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT); #define iscsi_priv_session_attr_show(field, format) \ static ssize_t \ show_priv_session_##field(struct class_device *cdev, char *buf) \ { \ struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\ return sprintf(buf, format"\n", session->field); \ } #define iscsi_priv_session_attr(field, format) \ iscsi_priv_session_attr_show(field, format) \ static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ NULL) iscsi_priv_session_attr(recovery_tmo, "%d"); #define SETUP_PRIV_SESSION_RD_ATTR(field) \ do { \ priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ count++; \ } while (0) #define SETUP_SESSION_RD_ATTR(field, param_flag) \ do { \ if (tt->param_mask & param_flag) { \ priv->session_attrs[count] = &class_device_attr_sess_##field; \ count++; \ } \ } while (0) #define SETUP_CONN_RD_ATTR(field, param_flag) \ do { \ if (tt->param_mask & param_flag) { \ priv->conn_attrs[count] = &class_device_attr_conn_##field; \ count++; \ } \ } while (0) static int iscsi_session_match(struct attribute_container *cont, struct device *dev) { struct iscsi_cls_session *session; struct Scsi_Host *shost; struct iscsi_internal *priv; if (!iscsi_is_session_dev(dev)) return 0; session = iscsi_dev_to_session(dev); shost = iscsi_session_to_shost(session); if (!shost->transportt) return 0; priv = to_iscsi_internal(shost->transportt); if (priv->session_cont.ac.class != &iscsi_session_class.class) return 0; return &priv->session_cont.ac == cont; } static int iscsi_conn_match(struct attribute_container *cont, struct device *dev) { struct iscsi_cls_session *session; struct iscsi_cls_conn *conn; struct Scsi_Host *shost; struct iscsi_internal *priv; if (!iscsi_is_conn_dev(dev)) return 0; conn = iscsi_dev_to_conn(dev); session = iscsi_dev_to_session(conn->dev.parent); shost = iscsi_session_to_shost(session); if (!shost->transportt) return 0; priv = to_iscsi_internal(shost->transportt); if (priv->conn_cont.ac.class != &iscsi_connection_class.class) return 0; return &priv->conn_cont.ac == cont; } static int iscsi_host_match(struct attribute_container *cont, struct device *dev) { struct Scsi_Host *shost; struct iscsi_internal *priv; if (!scsi_is_host_device(dev)) return 0; shost = dev_to_shost(dev); if (!shost->transportt || shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) return 0; priv = to_iscsi_internal(shost->transportt); return &priv->t.host_attrs.ac == cont; } struct scsi_transport_template * iscsi_register_transport(struct iscsi_transport *tt) { struct iscsi_internal *priv; unsigned long flags; int count = 0, err; BUG_ON(!tt); priv = iscsi_if_transport_lookup(tt); if (priv) return NULL; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return NULL; INIT_LIST_HEAD(&priv->list); priv->daemon_pid = -1; priv->iscsi_transport = tt; priv->t.user_scan = iscsi_user_scan; priv->cdev.class = &iscsi_transport_class; snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); err = class_device_register(&priv->cdev); if (err) goto free_priv; err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); if (err) goto unregister_cdev; /* host parameters */ priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; priv->t.host_attrs.ac.class = &iscsi_host_class.class; priv->t.host_attrs.ac.match = iscsi_host_match; priv->t.host_size = sizeof(struct iscsi_host); priv->host_attrs[0] = NULL; transport_container_register(&priv->t.host_attrs); /* connection parameters */ priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; priv->conn_cont.ac.class = &iscsi_connection_class.class; priv->conn_cont.ac.match = iscsi_conn_match; transport_container_register(&priv->conn_cont); SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); BUG_ON(count > ISCSI_CONN_ATTRS); priv->conn_attrs[count] = NULL; count = 0; /* session parameters */ priv->session_cont.ac.attrs = &priv->session_attrs[0]; priv->session_cont.ac.class = &iscsi_session_class.class; priv->session_cont.ac.match = iscsi_session_match; transport_container_register(&priv->session_cont); SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); BUG_ON(count > ISCSI_SESSION_ATTRS); priv->session_attrs[count] = NULL; spin_lock_irqsave(&iscsi_transport_lock, flags); list_add(&priv->list, &iscsi_transports); spin_unlock_irqrestore(&iscsi_transport_lock, flags); printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); return &priv->t; unregister_cdev: class_device_unregister(&priv->cdev); free_priv: kfree(priv); return NULL; } EXPORT_SYMBOL_GPL(iscsi_register_transport); int iscsi_unregister_transport(struct iscsi_transport *tt) { struct iscsi_internal *priv; unsigned long flags; BUG_ON(!tt); mutex_lock(&rx_queue_mutex); priv = iscsi_if_transport_lookup(tt); BUG_ON (!priv); spin_lock_irqsave(&iscsi_transport_lock, flags); list_del(&priv->list); spin_unlock_irqrestore(&iscsi_transport_lock, flags); transport_container_unregister(&priv->conn_cont); transport_container_unregister(&priv->session_cont); transport_container_unregister(&priv->t.host_attrs); sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); class_device_unregister(&priv->cdev); mutex_unlock(&rx_queue_mutex); return 0; } EXPORT_SYMBOL_GPL(iscsi_unregister_transport); static __init int iscsi_transport_init(void) { int err; printk(KERN_INFO "Loading iSCSI transport class v%s.\n", ISCSI_TRANSPORT_VERSION); err = class_register(&iscsi_transport_class); if (err) return err; err = transport_class_register(&iscsi_host_class); if (err) goto unregister_transport_class; err = transport_class_register(&iscsi_connection_class); if (err) goto unregister_host_class; err = transport_class_register(&iscsi_session_class); if (err) goto unregister_conn_class; nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, THIS_MODULE); if (!nls) { err = -ENOBUFS; goto unregister_session_class; } return 0; unregister_session_class: transport_class_unregister(&iscsi_session_class); unregister_conn_class: transport_class_unregister(&iscsi_connection_class); unregister_host_class: transport_class_unregister(&iscsi_host_class); unregister_transport_class: class_unregister(&iscsi_transport_class); return err; } static void __exit iscsi_transport_exit(void) { sock_release(nls->sk_socket); transport_class_unregister(&iscsi_connection_class); transport_class_unregister(&iscsi_session_class); transport_class_unregister(&iscsi_host_class); class_unregister(&iscsi_transport_class); } module_init(iscsi_transport_init); module_exit(iscsi_transport_exit); MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " "Dmitry Yusupov <dmitry_yus@yahoo.com>, " "Alex Aizman <itn780@yahoo.com>"); MODULE_DESCRIPTION("iSCSI Transport Interface"); MODULE_LICENSE("GPL"); MODULE_VERSION(ISCSI_TRANSPORT_VERSION);