1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * iSCSI transport class definitions
4  *
5  * Copyright (C) IBM Corporation, 2004
6  * Copyright (C) Mike Christie, 2004 - 2005
7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
8  * Copyright (C) Alex Aizman, 2004 - 2005
9  */
10 #include <linux/module.h>
11 #include <linux/mutex.h>
12 #include <linux/slab.h>
13 #include <linux/bsg-lib.h>
14 #include <linux/idr.h>
15 #include <net/tcp.h>
16 #include <scsi/scsi.h>
17 #include <scsi/scsi_host.h>
18 #include <scsi/scsi_device.h>
19 #include <scsi/scsi_transport.h>
20 #include <scsi/scsi_transport_iscsi.h>
21 #include <scsi/iscsi_if.h>
22 #include <scsi/scsi_cmnd.h>
23 #include <scsi/scsi_bsg_iscsi.h>
24 
25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
26 
27 #define ISCSI_SEND_MAX_ALLOWED  10
28 
29 #define CREATE_TRACE_POINTS
30 #include <trace/events/iscsi.h>
31 
32 /*
33  * Export tracepoint symbols to be used by other modules.
34  */
35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
40 
41 static int dbg_session;
42 module_param_named(debug_session, dbg_session, int,
43 		   S_IRUGO | S_IWUSR);
44 MODULE_PARM_DESC(debug_session,
45 		 "Turn on debugging for sessions in scsi_transport_iscsi "
46 		 "module. Set to 1 to turn on, and zero to turn off. Default "
47 		 "is off.");
48 
49 static int dbg_conn;
50 module_param_named(debug_conn, dbg_conn, int,
51 		   S_IRUGO | S_IWUSR);
52 MODULE_PARM_DESC(debug_conn,
53 		 "Turn on debugging for connections in scsi_transport_iscsi "
54 		 "module. Set to 1 to turn on, and zero to turn off. Default "
55 		 "is off.");
56 
57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)		\
58 	do {								\
59 		if (dbg_session)					\
60 			iscsi_cls_session_printk(KERN_INFO, _session,	\
61 						 "%s: " dbg_fmt,	\
62 						 __func__, ##arg);	\
63 		iscsi_dbg_trace(trace_iscsi_dbg_trans_session,		\
64 				&(_session)->dev,			\
65 				"%s " dbg_fmt, __func__, ##arg);	\
66 	} while (0);
67 
68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)			\
69 	do {								\
70 		if (dbg_conn)						\
71 			iscsi_cls_conn_printk(KERN_INFO, _conn,		\
72 					      "%s: " dbg_fmt,		\
73 					      __func__, ##arg);		\
74 		iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,		\
75 				&(_conn)->dev,				\
76 				"%s " dbg_fmt, __func__, ##arg);	\
77 	} while (0);
78 
79 struct iscsi_internal {
80 	struct scsi_transport_template t;
81 	struct iscsi_transport *iscsi_transport;
82 	struct list_head list;
83 	struct device dev;
84 
85 	struct transport_container conn_cont;
86 	struct transport_container session_cont;
87 };
88 
89 static DEFINE_IDR(iscsi_ep_idr);
90 static DEFINE_MUTEX(iscsi_ep_idr_mutex);
91 
92 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
93 
94 static struct workqueue_struct *iscsi_conn_cleanup_workq;
95 
96 static DEFINE_IDA(iscsi_sess_ida);
97 /*
98  * list of registered transports and lock that must
99  * be held while accessing list. The iscsi_transport_lock must
100  * be acquired after the rx_queue_mutex.
101  */
102 static LIST_HEAD(iscsi_transports);
103 static DEFINE_SPINLOCK(iscsi_transport_lock);
104 
105 #define to_iscsi_internal(tmpl) \
106 	container_of(tmpl, struct iscsi_internal, t)
107 
108 #define dev_to_iscsi_internal(_dev) \
109 	container_of(_dev, struct iscsi_internal, dev)
110 
iscsi_transport_release(struct device * dev)111 static void iscsi_transport_release(struct device *dev)
112 {
113 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
114 	kfree(priv);
115 }
116 
117 /*
118  * iscsi_transport_class represents the iscsi_transports that are
119  * registered.
120  */
121 static struct class iscsi_transport_class = {
122 	.name = "iscsi_transport",
123 	.dev_release = iscsi_transport_release,
124 };
125 
126 static ssize_t
show_transport_handle(struct device * dev,struct device_attribute * attr,char * buf)127 show_transport_handle(struct device *dev, struct device_attribute *attr,
128 		      char *buf)
129 {
130 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
131 
132 	if (!capable(CAP_SYS_ADMIN))
133 		return -EACCES;
134 	return sysfs_emit(buf, "%llu\n",
135 		  (unsigned long long)iscsi_handle(priv->iscsi_transport));
136 }
137 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
138 
139 #define show_transport_attr(name, format)				\
140 static ssize_t								\
141 show_transport_##name(struct device *dev, 				\
142 		      struct device_attribute *attr,char *buf)		\
143 {									\
144 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);	\
145 	return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
146 }									\
147 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
148 
149 show_transport_attr(caps, "0x%x");
150 
151 static struct attribute *iscsi_transport_attrs[] = {
152 	&dev_attr_handle.attr,
153 	&dev_attr_caps.attr,
154 	NULL,
155 };
156 
157 static struct attribute_group iscsi_transport_group = {
158 	.attrs = iscsi_transport_attrs,
159 };
160 
161 /*
162  * iSCSI endpoint attrs
163  */
164 #define iscsi_dev_to_endpoint(_dev) \
165 	container_of(_dev, struct iscsi_endpoint, dev)
166 
167 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)	\
168 struct device_attribute dev_attr_##_prefix##_##_name =	\
169         __ATTR(_name,_mode,_show,_store)
170 
iscsi_endpoint_release(struct device * dev)171 static void iscsi_endpoint_release(struct device *dev)
172 {
173 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
174 
175 	mutex_lock(&iscsi_ep_idr_mutex);
176 	idr_remove(&iscsi_ep_idr, ep->id);
177 	mutex_unlock(&iscsi_ep_idr_mutex);
178 
179 	kfree(ep);
180 }
181 
182 static struct class iscsi_endpoint_class = {
183 	.name = "iscsi_endpoint",
184 	.dev_release = iscsi_endpoint_release,
185 };
186 
187 static ssize_t
show_ep_handle(struct device * dev,struct device_attribute * attr,char * buf)188 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
189 {
190 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
191 	return sysfs_emit(buf, "%d\n", ep->id);
192 }
193 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
194 
195 static struct attribute *iscsi_endpoint_attrs[] = {
196 	&dev_attr_ep_handle.attr,
197 	NULL,
198 };
199 
200 static struct attribute_group iscsi_endpoint_group = {
201 	.attrs = iscsi_endpoint_attrs,
202 };
203 
204 struct iscsi_endpoint *
iscsi_create_endpoint(int dd_size)205 iscsi_create_endpoint(int dd_size)
206 {
207 	struct iscsi_endpoint *ep;
208 	int err, id;
209 
210 	ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
211 	if (!ep)
212 		return NULL;
213 
214 	mutex_lock(&iscsi_ep_idr_mutex);
215 
216 	/*
217 	 * First endpoint id should be 1 to comply with user space
218 	 * applications (iscsid).
219 	 */
220 	id = idr_alloc(&iscsi_ep_idr, ep, 1, -1, GFP_NOIO);
221 	if (id < 0) {
222 		mutex_unlock(&iscsi_ep_idr_mutex);
223 		printk(KERN_ERR "Could not allocate endpoint ID. Error %d.\n",
224 		       id);
225 		goto free_ep;
226 	}
227 	mutex_unlock(&iscsi_ep_idr_mutex);
228 
229 	ep->id = id;
230 	ep->dev.class = &iscsi_endpoint_class;
231 	dev_set_name(&ep->dev, "ep-%d", id);
232 	err = device_register(&ep->dev);
233         if (err)
234 		goto put_dev;
235 
236 	err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
237 	if (err)
238 		goto unregister_dev;
239 
240 	if (dd_size)
241 		ep->dd_data = &ep[1];
242 	return ep;
243 
244 unregister_dev:
245 	device_unregister(&ep->dev);
246 	return NULL;
247 
248 put_dev:
249 	mutex_lock(&iscsi_ep_idr_mutex);
250 	idr_remove(&iscsi_ep_idr, id);
251 	mutex_unlock(&iscsi_ep_idr_mutex);
252 	put_device(&ep->dev);
253 	return NULL;
254 free_ep:
255 	kfree(ep);
256 	return NULL;
257 }
258 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
259 
iscsi_destroy_endpoint(struct iscsi_endpoint * ep)260 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
261 {
262 	sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
263 	device_unregister(&ep->dev);
264 }
265 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
266 
iscsi_put_endpoint(struct iscsi_endpoint * ep)267 void iscsi_put_endpoint(struct iscsi_endpoint *ep)
268 {
269 	put_device(&ep->dev);
270 }
271 EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
272 
273 /**
274  * iscsi_lookup_endpoint - get ep from handle
275  * @handle: endpoint handle
276  *
277  * Caller must do a iscsi_put_endpoint.
278  */
iscsi_lookup_endpoint(u64 handle)279 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
280 {
281 	struct iscsi_endpoint *ep;
282 
283 	mutex_lock(&iscsi_ep_idr_mutex);
284 	ep = idr_find(&iscsi_ep_idr, handle);
285 	if (!ep)
286 		goto unlock;
287 
288 	get_device(&ep->dev);
289 unlock:
290 	mutex_unlock(&iscsi_ep_idr_mutex);
291 	return ep;
292 }
293 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
294 
295 /*
296  * Interface to display network param to sysfs
297  */
298 
iscsi_iface_release(struct device * dev)299 static void iscsi_iface_release(struct device *dev)
300 {
301 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
302 	struct device *parent = iface->dev.parent;
303 
304 	kfree(iface);
305 	put_device(parent);
306 }
307 
308 
309 static struct class iscsi_iface_class = {
310 	.name = "iscsi_iface",
311 	.dev_release = iscsi_iface_release,
312 };
313 
314 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)	\
315 struct device_attribute dev_attr_##_prefix##_##_name =		\
316 	__ATTR(_name, _mode, _show, _store)
317 
318 /* iface attrs show */
319 #define iscsi_iface_attr_show(type, name, param_type, param)		\
320 static ssize_t								\
321 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
322 		     char *buf)						\
323 {									\
324 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);		\
325 	struct iscsi_transport *t = iface->transport;			\
326 	return t->get_iface_param(iface, param_type, param, buf);	\
327 }									\
328 
329 #define iscsi_iface_net_attr(type, name, param)				\
330 	iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)	\
331 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
332 
333 #define iscsi_iface_attr(type, name, param)				\
334 	iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)	\
335 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
336 
337 /* generic read only ipv4 attribute */
338 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
339 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
340 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
341 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
342 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
343 		     ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
344 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
345 		     ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
346 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
347 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
348 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
349 		     ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
350 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
351 		     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
352 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
353 		     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
354 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
355 		     ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
356 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
357 		     ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
358 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
359 		     ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
360 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
361 		     ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
362 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
363 		     ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
364 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
365 		     ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
366 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
367 
368 /* generic read only ipv6 attribute */
369 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
370 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
371 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL);
372 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
373 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
374 		     ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
375 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
376 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
377 iscsi_iface_net_attr(ipv6_iface, link_local_state,
378 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
379 iscsi_iface_net_attr(ipv6_iface, router_state,
380 		     ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
381 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
382 		     ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
383 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
384 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
385 iscsi_iface_net_attr(ipv6_iface, traffic_class,
386 		     ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
387 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
388 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
389 		     ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
390 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
391 		     ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
392 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
393 		     ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
394 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
395 		     ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
396 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
397 		     ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
398 
399 /* common read only iface attribute */
400 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
401 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
402 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
403 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
404 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
405 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
406 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
407 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
408 iscsi_iface_net_attr(iface, tcp_nagle_disable,
409 		     ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
410 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
411 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
412 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
413 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
414 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
415 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
416 
417 /* common iscsi specific settings attributes */
418 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
419 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
420 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
421 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
422 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
423 iscsi_iface_attr(iface, data_seq_in_order,
424 		 ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
425 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
426 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
427 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
428 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
429 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
430 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
431 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
432 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
433 iscsi_iface_attr(iface, discovery_auth_optional,
434 		 ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
435 iscsi_iface_attr(iface, discovery_logout,
436 		 ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
437 iscsi_iface_attr(iface, strict_login_comp_en,
438 		 ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
439 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
440 
iscsi_iface_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)441 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
442 					  struct attribute *attr, int i)
443 {
444 	struct device *dev = container_of(kobj, struct device, kobj);
445 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
446 	struct iscsi_transport *t = iface->transport;
447 	int param = -1;
448 
449 	if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
450 		param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
451 	else if (attr == &dev_attr_iface_header_digest.attr)
452 		param = ISCSI_IFACE_PARAM_HDRDGST_EN;
453 	else if (attr == &dev_attr_iface_data_digest.attr)
454 		param = ISCSI_IFACE_PARAM_DATADGST_EN;
455 	else if (attr == &dev_attr_iface_immediate_data.attr)
456 		param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
457 	else if (attr == &dev_attr_iface_initial_r2t.attr)
458 		param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
459 	else if (attr == &dev_attr_iface_data_seq_in_order.attr)
460 		param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
461 	else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
462 		param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
463 	else if (attr == &dev_attr_iface_erl.attr)
464 		param = ISCSI_IFACE_PARAM_ERL;
465 	else if (attr == &dev_attr_iface_max_recv_dlength.attr)
466 		param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
467 	else if (attr == &dev_attr_iface_first_burst_len.attr)
468 		param = ISCSI_IFACE_PARAM_FIRST_BURST;
469 	else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
470 		param = ISCSI_IFACE_PARAM_MAX_R2T;
471 	else if (attr == &dev_attr_iface_max_burst_len.attr)
472 		param = ISCSI_IFACE_PARAM_MAX_BURST;
473 	else if (attr == &dev_attr_iface_chap_auth.attr)
474 		param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
475 	else if (attr == &dev_attr_iface_bidi_chap.attr)
476 		param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
477 	else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
478 		param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
479 	else if (attr == &dev_attr_iface_discovery_logout.attr)
480 		param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
481 	else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
482 		param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
483 	else if (attr == &dev_attr_iface_initiator_name.attr)
484 		param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
485 
486 	if (param != -1)
487 		return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
488 
489 	if (attr == &dev_attr_iface_enabled.attr)
490 		param = ISCSI_NET_PARAM_IFACE_ENABLE;
491 	else if (attr == &dev_attr_iface_vlan_id.attr)
492 		param = ISCSI_NET_PARAM_VLAN_ID;
493 	else if (attr == &dev_attr_iface_vlan_priority.attr)
494 		param = ISCSI_NET_PARAM_VLAN_PRIORITY;
495 	else if (attr == &dev_attr_iface_vlan_enabled.attr)
496 		param = ISCSI_NET_PARAM_VLAN_ENABLED;
497 	else if (attr == &dev_attr_iface_mtu.attr)
498 		param = ISCSI_NET_PARAM_MTU;
499 	else if (attr == &dev_attr_iface_port.attr)
500 		param = ISCSI_NET_PARAM_PORT;
501 	else if (attr == &dev_attr_iface_ipaddress_state.attr)
502 		param = ISCSI_NET_PARAM_IPADDR_STATE;
503 	else if (attr == &dev_attr_iface_delayed_ack_en.attr)
504 		param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
505 	else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
506 		param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
507 	else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
508 		param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
509 	else if (attr == &dev_attr_iface_tcp_wsf.attr)
510 		param = ISCSI_NET_PARAM_TCP_WSF;
511 	else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
512 		param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
513 	else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
514 		param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
515 	else if (attr == &dev_attr_iface_cache_id.attr)
516 		param = ISCSI_NET_PARAM_CACHE_ID;
517 	else if (attr == &dev_attr_iface_redirect_en.attr)
518 		param = ISCSI_NET_PARAM_REDIRECT_EN;
519 	else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
520 		if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
521 			param = ISCSI_NET_PARAM_IPV4_ADDR;
522 		else if (attr == &dev_attr_ipv4_iface_gateway.attr)
523 			param = ISCSI_NET_PARAM_IPV4_GW;
524 		else if (attr == &dev_attr_ipv4_iface_subnet.attr)
525 			param = ISCSI_NET_PARAM_IPV4_SUBNET;
526 		else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
527 			param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
528 		else if (attr ==
529 			 &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
530 			param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
531 		else if (attr ==
532 			 &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
533 			param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
534 		else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
535 			param = ISCSI_NET_PARAM_IPV4_TOS_EN;
536 		else if (attr == &dev_attr_ipv4_iface_tos.attr)
537 			param = ISCSI_NET_PARAM_IPV4_TOS;
538 		else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
539 			param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
540 		else if (attr ==
541 			 &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
542 			param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
543 		else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
544 			param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
545 		else if (attr ==
546 			 &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
547 			param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
548 		else if (attr ==
549 			 &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
550 			param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
551 		else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
552 			param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
553 		else if (attr ==
554 			 &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
555 			param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
556 		else if (attr ==
557 			 &dev_attr_ipv4_iface_fragment_disable.attr)
558 			param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
559 		else if (attr ==
560 			 &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
561 			param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
562 		else if (attr == &dev_attr_ipv4_iface_ttl.attr)
563 			param = ISCSI_NET_PARAM_IPV4_TTL;
564 		else
565 			return 0;
566 	} else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
567 		if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
568 			param = ISCSI_NET_PARAM_IPV6_ADDR;
569 		else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
570 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
571 		else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
572 			param = ISCSI_NET_PARAM_IPV6_ROUTER;
573 		else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
574 			param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
575 		else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
576 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
577 		else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
578 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
579 		else if (attr == &dev_attr_ipv6_iface_router_state.attr)
580 			param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
581 		else if (attr ==
582 			 &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
583 			param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
584 		else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
585 			param = ISCSI_NET_PARAM_IPV6_MLD_EN;
586 		else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
587 			param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
588 		else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
589 			param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
590 		else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
591 			param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
592 		else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
593 			param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
594 		else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
595 			param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
596 		else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
597 			param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
598 		else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
599 			param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
600 		else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
601 			param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
602 		else
603 			return 0;
604 	} else {
605 		WARN_ONCE(1, "Invalid iface attr");
606 		return 0;
607 	}
608 
609 	return t->attr_is_visible(ISCSI_NET_PARAM, param);
610 }
611 
612 static struct attribute *iscsi_iface_attrs[] = {
613 	&dev_attr_iface_enabled.attr,
614 	&dev_attr_iface_vlan_id.attr,
615 	&dev_attr_iface_vlan_priority.attr,
616 	&dev_attr_iface_vlan_enabled.attr,
617 	&dev_attr_ipv4_iface_ipaddress.attr,
618 	&dev_attr_ipv4_iface_gateway.attr,
619 	&dev_attr_ipv4_iface_subnet.attr,
620 	&dev_attr_ipv4_iface_bootproto.attr,
621 	&dev_attr_ipv6_iface_ipaddress.attr,
622 	&dev_attr_ipv6_iface_link_local_addr.attr,
623 	&dev_attr_ipv6_iface_router_addr.attr,
624 	&dev_attr_ipv6_iface_ipaddr_autocfg.attr,
625 	&dev_attr_ipv6_iface_link_local_autocfg.attr,
626 	&dev_attr_iface_mtu.attr,
627 	&dev_attr_iface_port.attr,
628 	&dev_attr_iface_ipaddress_state.attr,
629 	&dev_attr_iface_delayed_ack_en.attr,
630 	&dev_attr_iface_tcp_nagle_disable.attr,
631 	&dev_attr_iface_tcp_wsf_disable.attr,
632 	&dev_attr_iface_tcp_wsf.attr,
633 	&dev_attr_iface_tcp_timer_scale.attr,
634 	&dev_attr_iface_tcp_timestamp_en.attr,
635 	&dev_attr_iface_cache_id.attr,
636 	&dev_attr_iface_redirect_en.attr,
637 	&dev_attr_iface_def_taskmgmt_tmo.attr,
638 	&dev_attr_iface_header_digest.attr,
639 	&dev_attr_iface_data_digest.attr,
640 	&dev_attr_iface_immediate_data.attr,
641 	&dev_attr_iface_initial_r2t.attr,
642 	&dev_attr_iface_data_seq_in_order.attr,
643 	&dev_attr_iface_data_pdu_in_order.attr,
644 	&dev_attr_iface_erl.attr,
645 	&dev_attr_iface_max_recv_dlength.attr,
646 	&dev_attr_iface_first_burst_len.attr,
647 	&dev_attr_iface_max_outstanding_r2t.attr,
648 	&dev_attr_iface_max_burst_len.attr,
649 	&dev_attr_iface_chap_auth.attr,
650 	&dev_attr_iface_bidi_chap.attr,
651 	&dev_attr_iface_discovery_auth_optional.attr,
652 	&dev_attr_iface_discovery_logout.attr,
653 	&dev_attr_iface_strict_login_comp_en.attr,
654 	&dev_attr_iface_initiator_name.attr,
655 	&dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
656 	&dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
657 	&dev_attr_ipv4_iface_tos_en.attr,
658 	&dev_attr_ipv4_iface_tos.attr,
659 	&dev_attr_ipv4_iface_grat_arp_en.attr,
660 	&dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
661 	&dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
662 	&dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
663 	&dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
664 	&dev_attr_ipv4_iface_dhcp_vendor_id.attr,
665 	&dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
666 	&dev_attr_ipv4_iface_fragment_disable.attr,
667 	&dev_attr_ipv4_iface_incoming_forwarding_en.attr,
668 	&dev_attr_ipv4_iface_ttl.attr,
669 	&dev_attr_ipv6_iface_link_local_state.attr,
670 	&dev_attr_ipv6_iface_router_state.attr,
671 	&dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
672 	&dev_attr_ipv6_iface_mld_en.attr,
673 	&dev_attr_ipv6_iface_flow_label.attr,
674 	&dev_attr_ipv6_iface_traffic_class.attr,
675 	&dev_attr_ipv6_iface_hop_limit.attr,
676 	&dev_attr_ipv6_iface_nd_reachable_tmo.attr,
677 	&dev_attr_ipv6_iface_nd_rexmit_time.attr,
678 	&dev_attr_ipv6_iface_nd_stale_tmo.attr,
679 	&dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
680 	&dev_attr_ipv6_iface_router_adv_link_mtu.attr,
681 	NULL,
682 };
683 
684 static struct attribute_group iscsi_iface_group = {
685 	.attrs = iscsi_iface_attrs,
686 	.is_visible = iscsi_iface_attr_is_visible,
687 };
688 
689 /* convert iscsi_ipaddress_state values to ascii string name */
690 static const struct {
691 	enum iscsi_ipaddress_state	value;
692 	char				*name;
693 } iscsi_ipaddress_state_names[] = {
694 	{ISCSI_IPDDRESS_STATE_UNCONFIGURED,	"Unconfigured" },
695 	{ISCSI_IPDDRESS_STATE_ACQUIRING,	"Acquiring" },
696 	{ISCSI_IPDDRESS_STATE_TENTATIVE,	"Tentative" },
697 	{ISCSI_IPDDRESS_STATE_VALID,		"Valid" },
698 	{ISCSI_IPDDRESS_STATE_DISABLING,	"Disabling" },
699 	{ISCSI_IPDDRESS_STATE_INVALID,		"Invalid" },
700 	{ISCSI_IPDDRESS_STATE_DEPRECATED,	"Deprecated" },
701 };
702 
iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)703 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
704 {
705 	int i;
706 	char *state = NULL;
707 
708 	for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
709 		if (iscsi_ipaddress_state_names[i].value == port_state) {
710 			state = iscsi_ipaddress_state_names[i].name;
711 			break;
712 		}
713 	}
714 	return state;
715 }
716 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
717 
718 /* convert iscsi_router_state values to ascii string name */
719 static const struct {
720 	enum iscsi_router_state	value;
721 	char			*name;
722 } iscsi_router_state_names[] = {
723 	{ISCSI_ROUTER_STATE_UNKNOWN,		"Unknown" },
724 	{ISCSI_ROUTER_STATE_ADVERTISED,		"Advertised" },
725 	{ISCSI_ROUTER_STATE_MANUAL,		"Manual" },
726 	{ISCSI_ROUTER_STATE_STALE,		"Stale" },
727 };
728 
iscsi_get_router_state_name(enum iscsi_router_state router_state)729 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
730 {
731 	int i;
732 	char *state = NULL;
733 
734 	for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
735 		if (iscsi_router_state_names[i].value == router_state) {
736 			state = iscsi_router_state_names[i].name;
737 			break;
738 		}
739 	}
740 	return state;
741 }
742 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
743 
744 struct iscsi_iface *
iscsi_create_iface(struct Scsi_Host * shost,struct iscsi_transport * transport,uint32_t iface_type,uint32_t iface_num,int dd_size)745 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
746 		   uint32_t iface_type, uint32_t iface_num, int dd_size)
747 {
748 	struct iscsi_iface *iface;
749 	int err;
750 
751 	iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
752 	if (!iface)
753 		return NULL;
754 
755 	iface->transport = transport;
756 	iface->iface_type = iface_type;
757 	iface->iface_num = iface_num;
758 	iface->dev.release = iscsi_iface_release;
759 	iface->dev.class = &iscsi_iface_class;
760 	/* parent reference released in iscsi_iface_release */
761 	iface->dev.parent = get_device(&shost->shost_gendev);
762 	if (iface_type == ISCSI_IFACE_TYPE_IPV4)
763 		dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
764 			     iface_num);
765 	else
766 		dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
767 			     iface_num);
768 
769 	err = device_register(&iface->dev);
770 	if (err)
771 		goto put_dev;
772 
773 	err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
774 	if (err)
775 		goto unreg_iface;
776 
777 	if (dd_size)
778 		iface->dd_data = &iface[1];
779 	return iface;
780 
781 unreg_iface:
782 	device_unregister(&iface->dev);
783 	return NULL;
784 
785 put_dev:
786 	put_device(&iface->dev);
787 	return NULL;
788 }
789 EXPORT_SYMBOL_GPL(iscsi_create_iface);
790 
iscsi_destroy_iface(struct iscsi_iface * iface)791 void iscsi_destroy_iface(struct iscsi_iface *iface)
792 {
793 	sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
794 	device_unregister(&iface->dev);
795 }
796 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
797 
798 /*
799  * Interface to display flash node params to sysfs
800  */
801 
802 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)	\
803 struct device_attribute dev_attr_##_prefix##_##_name =			\
804 	__ATTR(_name, _mode, _show, _store)
805 
806 /* flash node session attrs show */
807 #define iscsi_flashnode_sess_attr_show(type, name, param)		\
808 static ssize_t								\
809 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
810 		     char *buf)						\
811 {									\
812 	struct iscsi_bus_flash_session *fnode_sess =			\
813 					iscsi_dev_to_flash_session(dev);\
814 	struct iscsi_transport *t = fnode_sess->transport;		\
815 	return t->get_flashnode_param(fnode_sess, param, buf);		\
816 }									\
817 
818 
819 #define iscsi_flashnode_sess_attr(type, name, param)			\
820 	iscsi_flashnode_sess_attr_show(type, name, param)		\
821 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,			\
822 			    show_##type##_##name, NULL);
823 
824 /* Flash node session attributes */
825 
826 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
827 			  ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
828 iscsi_flashnode_sess_attr(fnode, discovery_session,
829 			  ISCSI_FLASHNODE_DISCOVERY_SESS);
830 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
831 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
832 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
833 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
834 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
835 			  ISCSI_FLASHNODE_DATASEQ_INORDER);
836 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
837 			  ISCSI_FLASHNODE_PDU_INORDER);
838 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
839 iscsi_flashnode_sess_attr(fnode, discovery_logout,
840 			  ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
841 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
842 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
843 			  ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
844 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
845 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
846 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
847 iscsi_flashnode_sess_attr(fnode, def_time2retain,
848 			  ISCSI_FLASHNODE_DEF_TIME2RETAIN);
849 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
850 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
851 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
852 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
853 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
854 			  ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
855 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
856 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
857 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
858 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
859 			  ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
860 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
861 			  ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
862 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
863 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
864 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
865 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
866 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
867 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
868 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
869 
870 static struct attribute *iscsi_flashnode_sess_attrs[] = {
871 	&dev_attr_fnode_auto_snd_tgt_disable.attr,
872 	&dev_attr_fnode_discovery_session.attr,
873 	&dev_attr_fnode_portal_type.attr,
874 	&dev_attr_fnode_entry_enable.attr,
875 	&dev_attr_fnode_immediate_data.attr,
876 	&dev_attr_fnode_initial_r2t.attr,
877 	&dev_attr_fnode_data_seq_in_order.attr,
878 	&dev_attr_fnode_data_pdu_in_order.attr,
879 	&dev_attr_fnode_chap_auth.attr,
880 	&dev_attr_fnode_discovery_logout.attr,
881 	&dev_attr_fnode_bidi_chap.attr,
882 	&dev_attr_fnode_discovery_auth_optional.attr,
883 	&dev_attr_fnode_erl.attr,
884 	&dev_attr_fnode_first_burst_len.attr,
885 	&dev_attr_fnode_def_time2wait.attr,
886 	&dev_attr_fnode_def_time2retain.attr,
887 	&dev_attr_fnode_max_outstanding_r2t.attr,
888 	&dev_attr_fnode_isid.attr,
889 	&dev_attr_fnode_tsid.attr,
890 	&dev_attr_fnode_max_burst_len.attr,
891 	&dev_attr_fnode_def_taskmgmt_tmo.attr,
892 	&dev_attr_fnode_targetalias.attr,
893 	&dev_attr_fnode_targetname.attr,
894 	&dev_attr_fnode_tpgt.attr,
895 	&dev_attr_fnode_discovery_parent_idx.attr,
896 	&dev_attr_fnode_discovery_parent_type.attr,
897 	&dev_attr_fnode_chap_in_idx.attr,
898 	&dev_attr_fnode_chap_out_idx.attr,
899 	&dev_attr_fnode_username.attr,
900 	&dev_attr_fnode_username_in.attr,
901 	&dev_attr_fnode_password.attr,
902 	&dev_attr_fnode_password_in.attr,
903 	&dev_attr_fnode_is_boot_target.attr,
904 	NULL,
905 };
906 
iscsi_flashnode_sess_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)907 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
908 						    struct attribute *attr,
909 						    int i)
910 {
911 	struct device *dev = container_of(kobj, struct device, kobj);
912 	struct iscsi_bus_flash_session *fnode_sess =
913 						iscsi_dev_to_flash_session(dev);
914 	struct iscsi_transport *t = fnode_sess->transport;
915 	int param;
916 
917 	if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
918 		param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
919 	} else if (attr == &dev_attr_fnode_discovery_session.attr) {
920 		param = ISCSI_FLASHNODE_DISCOVERY_SESS;
921 	} else if (attr == &dev_attr_fnode_portal_type.attr) {
922 		param = ISCSI_FLASHNODE_PORTAL_TYPE;
923 	} else if (attr == &dev_attr_fnode_entry_enable.attr) {
924 		param = ISCSI_FLASHNODE_ENTRY_EN;
925 	} else if (attr == &dev_attr_fnode_immediate_data.attr) {
926 		param = ISCSI_FLASHNODE_IMM_DATA_EN;
927 	} else if (attr == &dev_attr_fnode_initial_r2t.attr) {
928 		param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
929 	} else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
930 		param = ISCSI_FLASHNODE_DATASEQ_INORDER;
931 	} else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
932 		param = ISCSI_FLASHNODE_PDU_INORDER;
933 	} else if (attr == &dev_attr_fnode_chap_auth.attr) {
934 		param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
935 	} else if (attr == &dev_attr_fnode_discovery_logout.attr) {
936 		param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
937 	} else if (attr == &dev_attr_fnode_bidi_chap.attr) {
938 		param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
939 	} else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
940 		param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
941 	} else if (attr == &dev_attr_fnode_erl.attr) {
942 		param = ISCSI_FLASHNODE_ERL;
943 	} else if (attr == &dev_attr_fnode_first_burst_len.attr) {
944 		param = ISCSI_FLASHNODE_FIRST_BURST;
945 	} else if (attr == &dev_attr_fnode_def_time2wait.attr) {
946 		param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
947 	} else if (attr == &dev_attr_fnode_def_time2retain.attr) {
948 		param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
949 	} else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
950 		param = ISCSI_FLASHNODE_MAX_R2T;
951 	} else if (attr == &dev_attr_fnode_isid.attr) {
952 		param = ISCSI_FLASHNODE_ISID;
953 	} else if (attr == &dev_attr_fnode_tsid.attr) {
954 		param = ISCSI_FLASHNODE_TSID;
955 	} else if (attr == &dev_attr_fnode_max_burst_len.attr) {
956 		param = ISCSI_FLASHNODE_MAX_BURST;
957 	} else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
958 		param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
959 	} else if (attr == &dev_attr_fnode_targetalias.attr) {
960 		param = ISCSI_FLASHNODE_ALIAS;
961 	} else if (attr == &dev_attr_fnode_targetname.attr) {
962 		param = ISCSI_FLASHNODE_NAME;
963 	} else if (attr == &dev_attr_fnode_tpgt.attr) {
964 		param = ISCSI_FLASHNODE_TPGT;
965 	} else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
966 		param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
967 	} else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
968 		param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
969 	} else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
970 		param = ISCSI_FLASHNODE_CHAP_IN_IDX;
971 	} else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
972 		param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
973 	} else if (attr == &dev_attr_fnode_username.attr) {
974 		param = ISCSI_FLASHNODE_USERNAME;
975 	} else if (attr == &dev_attr_fnode_username_in.attr) {
976 		param = ISCSI_FLASHNODE_USERNAME_IN;
977 	} else if (attr == &dev_attr_fnode_password.attr) {
978 		param = ISCSI_FLASHNODE_PASSWORD;
979 	} else if (attr == &dev_attr_fnode_password_in.attr) {
980 		param = ISCSI_FLASHNODE_PASSWORD_IN;
981 	} else if (attr == &dev_attr_fnode_is_boot_target.attr) {
982 		param = ISCSI_FLASHNODE_IS_BOOT_TGT;
983 	} else {
984 		WARN_ONCE(1, "Invalid flashnode session attr");
985 		return 0;
986 	}
987 
988 	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
989 }
990 
991 static struct attribute_group iscsi_flashnode_sess_attr_group = {
992 	.attrs = iscsi_flashnode_sess_attrs,
993 	.is_visible = iscsi_flashnode_sess_attr_is_visible,
994 };
995 
996 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
997 	&iscsi_flashnode_sess_attr_group,
998 	NULL,
999 };
1000 
iscsi_flashnode_sess_release(struct device * dev)1001 static void iscsi_flashnode_sess_release(struct device *dev)
1002 {
1003 	struct iscsi_bus_flash_session *fnode_sess =
1004 						iscsi_dev_to_flash_session(dev);
1005 
1006 	kfree(fnode_sess->targetname);
1007 	kfree(fnode_sess->targetalias);
1008 	kfree(fnode_sess->portal_type);
1009 	kfree(fnode_sess);
1010 }
1011 
1012 static const struct device_type iscsi_flashnode_sess_dev_type = {
1013 	.name = "iscsi_flashnode_sess_dev_type",
1014 	.groups = iscsi_flashnode_sess_attr_groups,
1015 	.release = iscsi_flashnode_sess_release,
1016 };
1017 
1018 /* flash node connection attrs show */
1019 #define iscsi_flashnode_conn_attr_show(type, name, param)		\
1020 static ssize_t								\
1021 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
1022 		     char *buf)						\
1023 {									\
1024 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1025 	struct iscsi_bus_flash_session *fnode_sess =			\
1026 				iscsi_flash_conn_to_flash_session(fnode_conn);\
1027 	struct iscsi_transport *t = fnode_conn->transport;		\
1028 	return t->get_flashnode_param(fnode_sess, param, buf);		\
1029 }									\
1030 
1031 
1032 #define iscsi_flashnode_conn_attr(type, name, param)			\
1033 	iscsi_flashnode_conn_attr_show(type, name, param)		\
1034 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,			\
1035 			    show_##type##_##name, NULL);
1036 
1037 /* Flash node connection attributes */
1038 
1039 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1040 			  ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1041 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1042 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1043 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1044 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1045 			  ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1046 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1047 			  ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1049 			  ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1050 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1051 			  ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1052 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1053 			  ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1054 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1055 			  ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1056 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1057 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1058 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1059 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1060 			  ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1061 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1062 			  ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1063 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1064 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1065 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1066 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1067 			  ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1068 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1069 			  ISCSI_FLASHNODE_REDIRECT_IPADDR);
1070 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1071 			  ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1072 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1073 			  ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1074 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1075 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1076 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1077 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1078 
1079 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1080 	&dev_attr_fnode_is_fw_assigned_ipv6.attr,
1081 	&dev_attr_fnode_header_digest.attr,
1082 	&dev_attr_fnode_data_digest.attr,
1083 	&dev_attr_fnode_snack_req.attr,
1084 	&dev_attr_fnode_tcp_timestamp_stat.attr,
1085 	&dev_attr_fnode_tcp_nagle_disable.attr,
1086 	&dev_attr_fnode_tcp_wsf_disable.attr,
1087 	&dev_attr_fnode_tcp_timer_scale.attr,
1088 	&dev_attr_fnode_tcp_timestamp_enable.attr,
1089 	&dev_attr_fnode_fragment_disable.attr,
1090 	&dev_attr_fnode_max_recv_dlength.attr,
1091 	&dev_attr_fnode_max_xmit_dlength.attr,
1092 	&dev_attr_fnode_keepalive_tmo.attr,
1093 	&dev_attr_fnode_port.attr,
1094 	&dev_attr_fnode_ipaddress.attr,
1095 	&dev_attr_fnode_redirect_ipaddr.attr,
1096 	&dev_attr_fnode_max_segment_size.attr,
1097 	&dev_attr_fnode_local_port.attr,
1098 	&dev_attr_fnode_ipv4_tos.attr,
1099 	&dev_attr_fnode_ipv6_traffic_class.attr,
1100 	&dev_attr_fnode_ipv6_flow_label.attr,
1101 	&dev_attr_fnode_link_local_ipv6.attr,
1102 	&dev_attr_fnode_tcp_xmit_wsf.attr,
1103 	&dev_attr_fnode_tcp_recv_wsf.attr,
1104 	&dev_attr_fnode_statsn.attr,
1105 	&dev_attr_fnode_exp_statsn.attr,
1106 	NULL,
1107 };
1108 
iscsi_flashnode_conn_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)1109 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1110 						    struct attribute *attr,
1111 						    int i)
1112 {
1113 	struct device *dev = container_of(kobj, struct device, kobj);
1114 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1115 	struct iscsi_transport *t = fnode_conn->transport;
1116 	int param;
1117 
1118 	if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1119 		param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1120 	} else if (attr == &dev_attr_fnode_header_digest.attr) {
1121 		param = ISCSI_FLASHNODE_HDR_DGST_EN;
1122 	} else if (attr == &dev_attr_fnode_data_digest.attr) {
1123 		param = ISCSI_FLASHNODE_DATA_DGST_EN;
1124 	} else if (attr == &dev_attr_fnode_snack_req.attr) {
1125 		param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1126 	} else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1127 		param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1128 	} else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1129 		param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1130 	} else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1131 		param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1132 	} else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1133 		param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1134 	} else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1135 		param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1136 	} else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1137 		param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1138 	} else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1139 		param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1140 	} else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1141 		param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1142 	} else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1143 		param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1144 	} else if (attr == &dev_attr_fnode_port.attr) {
1145 		param = ISCSI_FLASHNODE_PORT;
1146 	} else if (attr == &dev_attr_fnode_ipaddress.attr) {
1147 		param = ISCSI_FLASHNODE_IPADDR;
1148 	} else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1149 		param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1150 	} else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1151 		param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1152 	} else if (attr == &dev_attr_fnode_local_port.attr) {
1153 		param = ISCSI_FLASHNODE_LOCAL_PORT;
1154 	} else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1155 		param = ISCSI_FLASHNODE_IPV4_TOS;
1156 	} else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1157 		param = ISCSI_FLASHNODE_IPV6_TC;
1158 	} else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1159 		param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1160 	} else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1161 		param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1162 	} else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1163 		param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1164 	} else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1165 		param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1166 	} else if (attr == &dev_attr_fnode_statsn.attr) {
1167 		param = ISCSI_FLASHNODE_STATSN;
1168 	} else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1169 		param = ISCSI_FLASHNODE_EXP_STATSN;
1170 	} else {
1171 		WARN_ONCE(1, "Invalid flashnode connection attr");
1172 		return 0;
1173 	}
1174 
1175 	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1176 }
1177 
1178 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1179 	.attrs = iscsi_flashnode_conn_attrs,
1180 	.is_visible = iscsi_flashnode_conn_attr_is_visible,
1181 };
1182 
1183 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1184 	&iscsi_flashnode_conn_attr_group,
1185 	NULL,
1186 };
1187 
iscsi_flashnode_conn_release(struct device * dev)1188 static void iscsi_flashnode_conn_release(struct device *dev)
1189 {
1190 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1191 
1192 	kfree(fnode_conn->ipaddress);
1193 	kfree(fnode_conn->redirect_ipaddr);
1194 	kfree(fnode_conn->link_local_ipv6_addr);
1195 	kfree(fnode_conn);
1196 }
1197 
1198 static const struct device_type iscsi_flashnode_conn_dev_type = {
1199 	.name = "iscsi_flashnode_conn_dev_type",
1200 	.groups = iscsi_flashnode_conn_attr_groups,
1201 	.release = iscsi_flashnode_conn_release,
1202 };
1203 
1204 static struct bus_type iscsi_flashnode_bus;
1205 
iscsi_flashnode_bus_match(struct device * dev,struct device_driver * drv)1206 int iscsi_flashnode_bus_match(struct device *dev,
1207 				     struct device_driver *drv)
1208 {
1209 	if (dev->bus == &iscsi_flashnode_bus)
1210 		return 1;
1211 	return 0;
1212 }
1213 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1214 
1215 static struct bus_type iscsi_flashnode_bus = {
1216 	.name = "iscsi_flashnode",
1217 	.match = &iscsi_flashnode_bus_match,
1218 };
1219 
1220 /**
1221  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1222  * @shost: pointer to host data
1223  * @index: index of flashnode to add in sysfs
1224  * @transport: pointer to transport data
1225  * @dd_size: total size to allocate
1226  *
1227  * Adds a sysfs entry for the flashnode session attributes
1228  *
1229  * Returns:
1230  *  pointer to allocated flashnode sess on success
1231  *  %NULL on failure
1232  */
1233 struct iscsi_bus_flash_session *
iscsi_create_flashnode_sess(struct Scsi_Host * shost,int index,struct iscsi_transport * transport,int dd_size)1234 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1235 			    struct iscsi_transport *transport,
1236 			    int dd_size)
1237 {
1238 	struct iscsi_bus_flash_session *fnode_sess;
1239 	int err;
1240 
1241 	fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1242 	if (!fnode_sess)
1243 		return NULL;
1244 
1245 	fnode_sess->transport = transport;
1246 	fnode_sess->target_id = index;
1247 	fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1248 	fnode_sess->dev.bus = &iscsi_flashnode_bus;
1249 	fnode_sess->dev.parent = &shost->shost_gendev;
1250 	dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1251 		     shost->host_no, index);
1252 
1253 	err = device_register(&fnode_sess->dev);
1254 	if (err)
1255 		goto put_dev;
1256 
1257 	if (dd_size)
1258 		fnode_sess->dd_data = &fnode_sess[1];
1259 
1260 	return fnode_sess;
1261 
1262 put_dev:
1263 	put_device(&fnode_sess->dev);
1264 	return NULL;
1265 }
1266 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1267 
1268 /**
1269  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1270  * @shost: pointer to host data
1271  * @fnode_sess: pointer to the parent flashnode session entry
1272  * @transport: pointer to transport data
1273  * @dd_size: total size to allocate
1274  *
1275  * Adds a sysfs entry for the flashnode connection attributes
1276  *
1277  * Returns:
1278  *  pointer to allocated flashnode conn on success
1279  *  %NULL on failure
1280  */
1281 struct iscsi_bus_flash_conn *
iscsi_create_flashnode_conn(struct Scsi_Host * shost,struct iscsi_bus_flash_session * fnode_sess,struct iscsi_transport * transport,int dd_size)1282 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1283 			    struct iscsi_bus_flash_session *fnode_sess,
1284 			    struct iscsi_transport *transport,
1285 			    int dd_size)
1286 {
1287 	struct iscsi_bus_flash_conn *fnode_conn;
1288 	int err;
1289 
1290 	fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1291 	if (!fnode_conn)
1292 		return NULL;
1293 
1294 	fnode_conn->transport = transport;
1295 	fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1296 	fnode_conn->dev.bus = &iscsi_flashnode_bus;
1297 	fnode_conn->dev.parent = &fnode_sess->dev;
1298 	dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1299 		     shost->host_no, fnode_sess->target_id);
1300 
1301 	err = device_register(&fnode_conn->dev);
1302 	if (err)
1303 		goto put_dev;
1304 
1305 	if (dd_size)
1306 		fnode_conn->dd_data = &fnode_conn[1];
1307 
1308 	return fnode_conn;
1309 
1310 put_dev:
1311 	put_device(&fnode_conn->dev);
1312 	return NULL;
1313 }
1314 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1315 
1316 /**
1317  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1318  * @dev: device to verify
1319  * @data: pointer to data containing value to use for verification
1320  *
1321  * Verifies if the passed device is flashnode conn device
1322  *
1323  * Returns:
1324  *  1 on success
1325  *  0 on failure
1326  */
iscsi_is_flashnode_conn_dev(struct device * dev,void * data)1327 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1328 {
1329 	return dev->bus == &iscsi_flashnode_bus;
1330 }
1331 
iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn * fnode_conn)1332 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1333 {
1334 	device_unregister(&fnode_conn->dev);
1335 	return 0;
1336 }
1337 
flashnode_match_index(struct device * dev,void * data)1338 static int flashnode_match_index(struct device *dev, void *data)
1339 {
1340 	struct iscsi_bus_flash_session *fnode_sess = NULL;
1341 	int ret = 0;
1342 
1343 	if (!iscsi_flashnode_bus_match(dev, NULL))
1344 		goto exit_match_index;
1345 
1346 	fnode_sess = iscsi_dev_to_flash_session(dev);
1347 	ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1348 
1349 exit_match_index:
1350 	return ret;
1351 }
1352 
1353 /**
1354  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1355  * @shost: pointer to host data
1356  * @idx: index to match
1357  *
1358  * Finds the flashnode session object for the passed index
1359  *
1360  * Returns:
1361  *  pointer to found flashnode session object on success
1362  *  %NULL on failure
1363  */
1364 static struct iscsi_bus_flash_session *
iscsi_get_flashnode_by_index(struct Scsi_Host * shost,uint32_t idx)1365 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1366 {
1367 	struct iscsi_bus_flash_session *fnode_sess = NULL;
1368 	struct device *dev;
1369 
1370 	dev = device_find_child(&shost->shost_gendev, &idx,
1371 				flashnode_match_index);
1372 	if (dev)
1373 		fnode_sess = iscsi_dev_to_flash_session(dev);
1374 
1375 	return fnode_sess;
1376 }
1377 
1378 /**
1379  * iscsi_find_flashnode_sess - finds flashnode session entry
1380  * @shost: pointer to host data
1381  * @data: pointer to data containing value to use for comparison
1382  * @fn: function pointer that does actual comparison
1383  *
1384  * Finds the flashnode session object comparing the data passed using logic
1385  * defined in passed function pointer
1386  *
1387  * Returns:
1388  *  pointer to found flashnode session device object on success
1389  *  %NULL on failure
1390  */
1391 struct device *
iscsi_find_flashnode_sess(struct Scsi_Host * shost,void * data,int (* fn)(struct device * dev,void * data))1392 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1393 			  int (*fn)(struct device *dev, void *data))
1394 {
1395 	return device_find_child(&shost->shost_gendev, data, fn);
1396 }
1397 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1398 
1399 /**
1400  * iscsi_find_flashnode_conn - finds flashnode connection entry
1401  * @fnode_sess: pointer to parent flashnode session entry
1402  *
1403  * Finds the flashnode connection object comparing the data passed using logic
1404  * defined in passed function pointer
1405  *
1406  * Returns:
1407  *  pointer to found flashnode connection device object on success
1408  *  %NULL on failure
1409  */
1410 struct device *
iscsi_find_flashnode_conn(struct iscsi_bus_flash_session * fnode_sess)1411 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1412 {
1413 	return device_find_child(&fnode_sess->dev, NULL,
1414 				 iscsi_is_flashnode_conn_dev);
1415 }
1416 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1417 
iscsi_iter_destroy_flashnode_conn_fn(struct device * dev,void * data)1418 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1419 {
1420 	if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1421 		return 0;
1422 
1423 	return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1424 }
1425 
1426 /**
1427  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1428  * @fnode_sess: pointer to flashnode session entry to be destroyed
1429  *
1430  * Deletes the flashnode session entry and all children flashnode connection
1431  * entries from sysfs
1432  */
iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session * fnode_sess)1433 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1434 {
1435 	int err;
1436 
1437 	err = device_for_each_child(&fnode_sess->dev, NULL,
1438 				    iscsi_iter_destroy_flashnode_conn_fn);
1439 	if (err)
1440 		pr_err("Could not delete all connections for %s. Error %d.\n",
1441 		       fnode_sess->dev.kobj.name, err);
1442 
1443 	device_unregister(&fnode_sess->dev);
1444 }
1445 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1446 
iscsi_iter_destroy_flashnode_fn(struct device * dev,void * data)1447 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1448 {
1449 	if (!iscsi_flashnode_bus_match(dev, NULL))
1450 		return 0;
1451 
1452 	iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1453 	return 0;
1454 }
1455 
1456 /**
1457  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1458  * @shost: pointer to host data
1459  *
1460  * Destroys all the flashnode session entries and all corresponding children
1461  * flashnode connection entries from sysfs
1462  */
iscsi_destroy_all_flashnode(struct Scsi_Host * shost)1463 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1464 {
1465 	device_for_each_child(&shost->shost_gendev, NULL,
1466 			      iscsi_iter_destroy_flashnode_fn);
1467 }
1468 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1469 
1470 /*
1471  * BSG support
1472  */
1473 /**
1474  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1475  * @job: bsg job to be processed
1476  */
iscsi_bsg_host_dispatch(struct bsg_job * job)1477 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1478 {
1479 	struct Scsi_Host *shost = iscsi_job_to_shost(job);
1480 	struct iscsi_bsg_request *req = job->request;
1481 	struct iscsi_bsg_reply *reply = job->reply;
1482 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1483 	int cmdlen = sizeof(uint32_t);	/* start with length of msgcode */
1484 	int ret;
1485 
1486 	/* check if we have the msgcode value at least */
1487 	if (job->request_len < sizeof(uint32_t)) {
1488 		ret = -ENOMSG;
1489 		goto fail_host_msg;
1490 	}
1491 
1492 	/* Validate the host command */
1493 	switch (req->msgcode) {
1494 	case ISCSI_BSG_HST_VENDOR:
1495 		cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1496 		if ((shost->hostt->vendor_id == 0L) ||
1497 		    (req->rqst_data.h_vendor.vendor_id !=
1498 			shost->hostt->vendor_id)) {
1499 			ret = -ESRCH;
1500 			goto fail_host_msg;
1501 		}
1502 		break;
1503 	default:
1504 		ret = -EBADR;
1505 		goto fail_host_msg;
1506 	}
1507 
1508 	/* check if we really have all the request data needed */
1509 	if (job->request_len < cmdlen) {
1510 		ret = -ENOMSG;
1511 		goto fail_host_msg;
1512 	}
1513 
1514 	ret = i->iscsi_transport->bsg_request(job);
1515 	if (!ret)
1516 		return 0;
1517 
1518 fail_host_msg:
1519 	/* return the errno failure code as the only status */
1520 	BUG_ON(job->reply_len < sizeof(uint32_t));
1521 	reply->reply_payload_rcv_len = 0;
1522 	reply->result = ret;
1523 	job->reply_len = sizeof(uint32_t);
1524 	bsg_job_done(job, ret, 0);
1525 	return 0;
1526 }
1527 
1528 /**
1529  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1530  * @shost: shost for iscsi_host
1531  * @ihost: iscsi_cls_host adding the structures to
1532  */
1533 static int
iscsi_bsg_host_add(struct Scsi_Host * shost,struct iscsi_cls_host * ihost)1534 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1535 {
1536 	struct device *dev = &shost->shost_gendev;
1537 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1538 	struct request_queue *q;
1539 	char bsg_name[20];
1540 
1541 	if (!i->iscsi_transport->bsg_request)
1542 		return -ENOTSUPP;
1543 
1544 	snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1545 	q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1546 	if (IS_ERR(q)) {
1547 		shost_printk(KERN_ERR, shost, "bsg interface failed to "
1548 			     "initialize - no request queue\n");
1549 		return PTR_ERR(q);
1550 	}
1551 	__scsi_init_queue(shost, q);
1552 
1553 	ihost->bsg_q = q;
1554 	return 0;
1555 }
1556 
iscsi_setup_host(struct transport_container * tc,struct device * dev,struct device * cdev)1557 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1558 			    struct device *cdev)
1559 {
1560 	struct Scsi_Host *shost = dev_to_shost(dev);
1561 	struct iscsi_cls_host *ihost = shost->shost_data;
1562 
1563 	memset(ihost, 0, sizeof(*ihost));
1564 	mutex_init(&ihost->mutex);
1565 
1566 	iscsi_bsg_host_add(shost, ihost);
1567 	/* ignore any bsg add error - we just can't do sgio */
1568 
1569 	return 0;
1570 }
1571 
iscsi_remove_host(struct transport_container * tc,struct device * dev,struct device * cdev)1572 static int iscsi_remove_host(struct transport_container *tc,
1573 			     struct device *dev, struct device *cdev)
1574 {
1575 	struct Scsi_Host *shost = dev_to_shost(dev);
1576 	struct iscsi_cls_host *ihost = shost->shost_data;
1577 
1578 	bsg_remove_queue(ihost->bsg_q);
1579 	return 0;
1580 }
1581 
1582 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1583 			       "iscsi_host",
1584 			       iscsi_setup_host,
1585 			       iscsi_remove_host,
1586 			       NULL);
1587 
1588 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1589 			       "iscsi_session",
1590 			       NULL,
1591 			       NULL,
1592 			       NULL);
1593 
1594 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1595 			       "iscsi_connection",
1596 			       NULL,
1597 			       NULL,
1598 			       NULL);
1599 
1600 static struct sock *nls;
1601 static DEFINE_MUTEX(rx_queue_mutex);
1602 
1603 static LIST_HEAD(sesslist);
1604 static DEFINE_SPINLOCK(sesslock);
1605 static LIST_HEAD(connlist);
1606 static LIST_HEAD(connlist_err);
1607 static DEFINE_SPINLOCK(connlock);
1608 
iscsi_conn_get_sid(struct iscsi_cls_conn * conn)1609 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1610 {
1611 	struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1612 	return sess->sid;
1613 }
1614 
1615 /*
1616  * Returns the matching session to a given sid
1617  */
iscsi_session_lookup(uint32_t sid)1618 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1619 {
1620 	unsigned long flags;
1621 	struct iscsi_cls_session *sess;
1622 
1623 	spin_lock_irqsave(&sesslock, flags);
1624 	list_for_each_entry(sess, &sesslist, sess_list) {
1625 		if (sess->sid == sid) {
1626 			spin_unlock_irqrestore(&sesslock, flags);
1627 			return sess;
1628 		}
1629 	}
1630 	spin_unlock_irqrestore(&sesslock, flags);
1631 	return NULL;
1632 }
1633 
1634 /*
1635  * Returns the matching connection to a given sid / cid tuple
1636  */
iscsi_conn_lookup(uint32_t sid,uint32_t cid)1637 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1638 {
1639 	unsigned long flags;
1640 	struct iscsi_cls_conn *conn;
1641 
1642 	spin_lock_irqsave(&connlock, flags);
1643 	list_for_each_entry(conn, &connlist, conn_list) {
1644 		if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1645 			spin_unlock_irqrestore(&connlock, flags);
1646 			return conn;
1647 		}
1648 	}
1649 	spin_unlock_irqrestore(&connlock, flags);
1650 	return NULL;
1651 }
1652 
1653 /*
1654  * The following functions can be used by LLDs that allocate
1655  * their own scsi_hosts or by software iscsi LLDs
1656  */
1657 static struct {
1658 	int value;
1659 	char *name;
1660 } iscsi_session_state_names[] = {
1661 	{ ISCSI_SESSION_LOGGED_IN,	"LOGGED_IN" },
1662 	{ ISCSI_SESSION_FAILED,		"FAILED" },
1663 	{ ISCSI_SESSION_FREE,		"FREE" },
1664 };
1665 
iscsi_session_state_name(int state)1666 static const char *iscsi_session_state_name(int state)
1667 {
1668 	int i;
1669 	char *name = NULL;
1670 
1671 	for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1672 		if (iscsi_session_state_names[i].value == state) {
1673 			name = iscsi_session_state_names[i].name;
1674 			break;
1675 		}
1676 	}
1677 	return name;
1678 }
1679 
1680 static char *iscsi_session_target_state_name[] = {
1681 	[ISCSI_SESSION_TARGET_UNBOUND]   = "UNBOUND",
1682 	[ISCSI_SESSION_TARGET_ALLOCATED] = "ALLOCATED",
1683 	[ISCSI_SESSION_TARGET_SCANNED]   = "SCANNED",
1684 	[ISCSI_SESSION_TARGET_UNBINDING] = "UNBINDING",
1685 };
1686 
iscsi_session_chkready(struct iscsi_cls_session * session)1687 int iscsi_session_chkready(struct iscsi_cls_session *session)
1688 {
1689 	int err;
1690 
1691 	switch (session->state) {
1692 	case ISCSI_SESSION_LOGGED_IN:
1693 		err = 0;
1694 		break;
1695 	case ISCSI_SESSION_FAILED:
1696 		err = DID_IMM_RETRY << 16;
1697 		break;
1698 	case ISCSI_SESSION_FREE:
1699 		err = DID_TRANSPORT_FAILFAST << 16;
1700 		break;
1701 	default:
1702 		err = DID_NO_CONNECT << 16;
1703 		break;
1704 	}
1705 	return err;
1706 }
1707 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1708 
iscsi_is_session_online(struct iscsi_cls_session * session)1709 int iscsi_is_session_online(struct iscsi_cls_session *session)
1710 {
1711 	unsigned long flags;
1712 	int ret = 0;
1713 
1714 	spin_lock_irqsave(&session->lock, flags);
1715 	if (session->state == ISCSI_SESSION_LOGGED_IN)
1716 		ret = 1;
1717 	spin_unlock_irqrestore(&session->lock, flags);
1718 	return ret;
1719 }
1720 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1721 
iscsi_session_release(struct device * dev)1722 static void iscsi_session_release(struct device *dev)
1723 {
1724 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1725 	struct Scsi_Host *shost;
1726 
1727 	shost = iscsi_session_to_shost(session);
1728 	scsi_host_put(shost);
1729 	ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1730 	kfree(session);
1731 }
1732 
iscsi_is_session_dev(const struct device * dev)1733 int iscsi_is_session_dev(const struct device *dev)
1734 {
1735 	return dev->release == iscsi_session_release;
1736 }
1737 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1738 
iscsi_iter_session_fn(struct device * dev,void * data)1739 static int iscsi_iter_session_fn(struct device *dev, void *data)
1740 {
1741 	void (* fn) (struct iscsi_cls_session *) = data;
1742 
1743 	if (!iscsi_is_session_dev(dev))
1744 		return 0;
1745 	fn(iscsi_dev_to_session(dev));
1746 	return 0;
1747 }
1748 
iscsi_host_for_each_session(struct Scsi_Host * shost,void (* fn)(struct iscsi_cls_session *))1749 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1750 				 void (*fn)(struct iscsi_cls_session *))
1751 {
1752 	device_for_each_child(&shost->shost_gendev, fn,
1753 			      iscsi_iter_session_fn);
1754 }
1755 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1756 
1757 struct iscsi_scan_data {
1758 	unsigned int channel;
1759 	unsigned int id;
1760 	u64 lun;
1761 	enum scsi_scan_mode rescan;
1762 };
1763 
iscsi_user_scan_session(struct device * dev,void * data)1764 static int iscsi_user_scan_session(struct device *dev, void *data)
1765 {
1766 	struct iscsi_scan_data *scan_data = data;
1767 	struct iscsi_cls_session *session;
1768 	struct Scsi_Host *shost;
1769 	struct iscsi_cls_host *ihost;
1770 	unsigned long flags;
1771 	unsigned int id;
1772 
1773 	if (!iscsi_is_session_dev(dev))
1774 		return 0;
1775 
1776 	session = iscsi_dev_to_session(dev);
1777 
1778 	ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1779 
1780 	shost = iscsi_session_to_shost(session);
1781 	ihost = shost->shost_data;
1782 
1783 	mutex_lock(&ihost->mutex);
1784 	spin_lock_irqsave(&session->lock, flags);
1785 	if (session->state != ISCSI_SESSION_LOGGED_IN) {
1786 		spin_unlock_irqrestore(&session->lock, flags);
1787 		goto user_scan_exit;
1788 	}
1789 	id = session->target_id;
1790 	spin_unlock_irqrestore(&session->lock, flags);
1791 
1792 	if (id != ISCSI_MAX_TARGET) {
1793 		if ((scan_data->channel == SCAN_WILD_CARD ||
1794 		     scan_data->channel == 0) &&
1795 		    (scan_data->id == SCAN_WILD_CARD ||
1796 		     scan_data->id == id)) {
1797 			scsi_scan_target(&session->dev, 0, id,
1798 					 scan_data->lun, scan_data->rescan);
1799 			spin_lock_irqsave(&session->lock, flags);
1800 			session->target_state = ISCSI_SESSION_TARGET_SCANNED;
1801 			spin_unlock_irqrestore(&session->lock, flags);
1802 		}
1803 	}
1804 
1805 user_scan_exit:
1806 	mutex_unlock(&ihost->mutex);
1807 	ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1808 	return 0;
1809 }
1810 
iscsi_user_scan(struct Scsi_Host * shost,uint channel,uint id,u64 lun)1811 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1812 			   uint id, u64 lun)
1813 {
1814 	struct iscsi_scan_data scan_data;
1815 
1816 	scan_data.channel = channel;
1817 	scan_data.id = id;
1818 	scan_data.lun = lun;
1819 	scan_data.rescan = SCSI_SCAN_MANUAL;
1820 
1821 	return device_for_each_child(&shost->shost_gendev, &scan_data,
1822 				     iscsi_user_scan_session);
1823 }
1824 
iscsi_scan_session(struct work_struct * work)1825 static void iscsi_scan_session(struct work_struct *work)
1826 {
1827 	struct iscsi_cls_session *session =
1828 			container_of(work, struct iscsi_cls_session, scan_work);
1829 	struct iscsi_scan_data scan_data;
1830 
1831 	scan_data.channel = 0;
1832 	scan_data.id = SCAN_WILD_CARD;
1833 	scan_data.lun = SCAN_WILD_CARD;
1834 	scan_data.rescan = SCSI_SCAN_RESCAN;
1835 
1836 	iscsi_user_scan_session(&session->dev, &scan_data);
1837 }
1838 
1839 /**
1840  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1841  * @cmd: scsi cmd passed to scsi eh handler
1842  *
1843  * If the session is down this function will wait for the recovery
1844  * timer to fire or for the session to be logged back in. If the
1845  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1846  * should pass this error value to the scsi eh.
1847  */
iscsi_block_scsi_eh(struct scsi_cmnd * cmd)1848 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1849 {
1850 	struct iscsi_cls_session *session =
1851 			starget_to_session(scsi_target(cmd->device));
1852 	unsigned long flags;
1853 	int ret = 0;
1854 
1855 	spin_lock_irqsave(&session->lock, flags);
1856 	while (session->state != ISCSI_SESSION_LOGGED_IN) {
1857 		if (session->state == ISCSI_SESSION_FREE) {
1858 			ret = FAST_IO_FAIL;
1859 			break;
1860 		}
1861 		spin_unlock_irqrestore(&session->lock, flags);
1862 		msleep(1000);
1863 		spin_lock_irqsave(&session->lock, flags);
1864 	}
1865 	spin_unlock_irqrestore(&session->lock, flags);
1866 	return ret;
1867 }
1868 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1869 
session_recovery_timedout(struct work_struct * work)1870 static void session_recovery_timedout(struct work_struct *work)
1871 {
1872 	struct iscsi_cls_session *session =
1873 		container_of(work, struct iscsi_cls_session,
1874 			     recovery_work.work);
1875 	unsigned long flags;
1876 
1877 	iscsi_cls_session_printk(KERN_INFO, session,
1878 				 "session recovery timed out after %d secs\n",
1879 				 session->recovery_tmo);
1880 
1881 	spin_lock_irqsave(&session->lock, flags);
1882 	switch (session->state) {
1883 	case ISCSI_SESSION_FAILED:
1884 		session->state = ISCSI_SESSION_FREE;
1885 		break;
1886 	case ISCSI_SESSION_LOGGED_IN:
1887 	case ISCSI_SESSION_FREE:
1888 		/* we raced with the unblock's flush */
1889 		spin_unlock_irqrestore(&session->lock, flags);
1890 		return;
1891 	}
1892 	spin_unlock_irqrestore(&session->lock, flags);
1893 
1894 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1895 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1896 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1897 
1898 	if (session->transport->session_recovery_timedout)
1899 		session->transport->session_recovery_timedout(session);
1900 }
1901 
__iscsi_unblock_session(struct work_struct * work)1902 static void __iscsi_unblock_session(struct work_struct *work)
1903 {
1904 	struct iscsi_cls_session *session =
1905 			container_of(work, struct iscsi_cls_session,
1906 				     unblock_work);
1907 	unsigned long flags;
1908 
1909 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1910 
1911 	cancel_delayed_work_sync(&session->recovery_work);
1912 	spin_lock_irqsave(&session->lock, flags);
1913 	session->state = ISCSI_SESSION_LOGGED_IN;
1914 	spin_unlock_irqrestore(&session->lock, flags);
1915 	/* start IO */
1916 	scsi_target_unblock(&session->dev, SDEV_RUNNING);
1917 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1918 }
1919 
1920 /**
1921  * iscsi_unblock_session - set a session as logged in and start IO.
1922  * @session: iscsi session
1923  *
1924  * Mark a session as ready to accept IO.
1925  */
iscsi_unblock_session(struct iscsi_cls_session * session)1926 void iscsi_unblock_session(struct iscsi_cls_session *session)
1927 {
1928 	if (!cancel_work_sync(&session->block_work))
1929 		cancel_delayed_work_sync(&session->recovery_work);
1930 
1931 	queue_work(session->workq, &session->unblock_work);
1932 	/*
1933 	 * Blocking the session can be done from any context so we only
1934 	 * queue the block work. Make sure the unblock work has completed
1935 	 * because it flushes/cancels the other works and updates the state.
1936 	 */
1937 	flush_work(&session->unblock_work);
1938 }
1939 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1940 
__iscsi_block_session(struct work_struct * work)1941 static void __iscsi_block_session(struct work_struct *work)
1942 {
1943 	struct iscsi_cls_session *session =
1944 			container_of(work, struct iscsi_cls_session,
1945 				     block_work);
1946 	unsigned long flags;
1947 
1948 	ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1949 	spin_lock_irqsave(&session->lock, flags);
1950 	session->state = ISCSI_SESSION_FAILED;
1951 	spin_unlock_irqrestore(&session->lock, flags);
1952 	scsi_target_block(&session->dev);
1953 	ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1954 	if (session->recovery_tmo >= 0)
1955 		queue_delayed_work(session->workq,
1956 				   &session->recovery_work,
1957 				   session->recovery_tmo * HZ);
1958 }
1959 
iscsi_block_session(struct iscsi_cls_session * session)1960 void iscsi_block_session(struct iscsi_cls_session *session)
1961 {
1962 	queue_work(session->workq, &session->block_work);
1963 }
1964 EXPORT_SYMBOL_GPL(iscsi_block_session);
1965 
__iscsi_unbind_session(struct work_struct * work)1966 static void __iscsi_unbind_session(struct work_struct *work)
1967 {
1968 	struct iscsi_cls_session *session =
1969 			container_of(work, struct iscsi_cls_session,
1970 				     unbind_work);
1971 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1972 	struct iscsi_cls_host *ihost = shost->shost_data;
1973 	unsigned long flags;
1974 	unsigned int target_id;
1975 	bool remove_target = true;
1976 
1977 	ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1978 
1979 	/* Prevent new scans and make sure scanning is not in progress */
1980 	mutex_lock(&ihost->mutex);
1981 	spin_lock_irqsave(&session->lock, flags);
1982 	if (session->target_state == ISCSI_SESSION_TARGET_ALLOCATED) {
1983 		remove_target = false;
1984 	} else if (session->target_state != ISCSI_SESSION_TARGET_SCANNED) {
1985 		spin_unlock_irqrestore(&session->lock, flags);
1986 		mutex_unlock(&ihost->mutex);
1987 		ISCSI_DBG_TRANS_SESSION(session,
1988 			"Skipping target unbinding: Session is unbound/unbinding.\n");
1989 		return;
1990 	}
1991 
1992 	session->target_state = ISCSI_SESSION_TARGET_UNBINDING;
1993 	target_id = session->target_id;
1994 	session->target_id = ISCSI_MAX_TARGET;
1995 	spin_unlock_irqrestore(&session->lock, flags);
1996 	mutex_unlock(&ihost->mutex);
1997 
1998 	if (remove_target)
1999 		scsi_remove_target(&session->dev);
2000 
2001 	if (session->ida_used)
2002 		ida_free(&iscsi_sess_ida, target_id);
2003 
2004 	iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2005 	ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2006 
2007 	spin_lock_irqsave(&session->lock, flags);
2008 	session->target_state = ISCSI_SESSION_TARGET_UNBOUND;
2009 	spin_unlock_irqrestore(&session->lock, flags);
2010 }
2011 
__iscsi_destroy_session(struct work_struct * work)2012 static void __iscsi_destroy_session(struct work_struct *work)
2013 {
2014 	struct iscsi_cls_session *session =
2015 		container_of(work, struct iscsi_cls_session, destroy_work);
2016 
2017 	session->transport->destroy_session(session);
2018 }
2019 
2020 struct iscsi_cls_session *
iscsi_alloc_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size)2021 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2022 		    int dd_size)
2023 {
2024 	struct iscsi_cls_session *session;
2025 
2026 	session = kzalloc(sizeof(*session) + dd_size,
2027 			  GFP_KERNEL);
2028 	if (!session)
2029 		return NULL;
2030 
2031 	session->transport = transport;
2032 	session->creator = -1;
2033 	session->recovery_tmo = 120;
2034 	session->recovery_tmo_sysfs_override = false;
2035 	session->state = ISCSI_SESSION_FREE;
2036 	INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2037 	INIT_LIST_HEAD(&session->sess_list);
2038 	INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2039 	INIT_WORK(&session->block_work, __iscsi_block_session);
2040 	INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2041 	INIT_WORK(&session->scan_work, iscsi_scan_session);
2042 	INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2043 	spin_lock_init(&session->lock);
2044 
2045 	/* this is released in the dev's release function */
2046 	scsi_host_get(shost);
2047 	session->dev.parent = &shost->shost_gendev;
2048 	session->dev.release = iscsi_session_release;
2049 	device_initialize(&session->dev);
2050 	if (dd_size)
2051 		session->dd_data = &session[1];
2052 
2053 	ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2054 	return session;
2055 }
2056 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2057 
iscsi_add_session(struct iscsi_cls_session * session,unsigned int target_id)2058 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2059 {
2060 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
2061 	unsigned long flags;
2062 	int id = 0;
2063 	int err;
2064 
2065 	session->sid = atomic_add_return(1, &iscsi_session_nr);
2066 
2067 	session->workq = alloc_workqueue("iscsi_ctrl_%d:%d",
2068 			WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
2069 			shost->host_no, session->sid);
2070 	if (!session->workq)
2071 		return -ENOMEM;
2072 
2073 	if (target_id == ISCSI_MAX_TARGET) {
2074 		id = ida_alloc(&iscsi_sess_ida, GFP_KERNEL);
2075 
2076 		if (id < 0) {
2077 			iscsi_cls_session_printk(KERN_ERR, session,
2078 					"Failure in Target ID Allocation\n");
2079 			err = id;
2080 			goto destroy_wq;
2081 		}
2082 		session->target_id = (unsigned int)id;
2083 		session->ida_used = true;
2084 	} else
2085 		session->target_id = target_id;
2086 	spin_lock_irqsave(&session->lock, flags);
2087 	session->target_state = ISCSI_SESSION_TARGET_ALLOCATED;
2088 	spin_unlock_irqrestore(&session->lock, flags);
2089 
2090 	dev_set_name(&session->dev, "session%u", session->sid);
2091 	err = device_add(&session->dev);
2092 	if (err) {
2093 		iscsi_cls_session_printk(KERN_ERR, session,
2094 					 "could not register session's dev\n");
2095 		goto release_ida;
2096 	}
2097 	err = transport_register_device(&session->dev);
2098 	if (err) {
2099 		iscsi_cls_session_printk(KERN_ERR, session,
2100 					 "could not register transport's dev\n");
2101 		goto release_dev;
2102 	}
2103 
2104 	spin_lock_irqsave(&sesslock, flags);
2105 	list_add(&session->sess_list, &sesslist);
2106 	spin_unlock_irqrestore(&sesslock, flags);
2107 
2108 	iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2109 	ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2110 	return 0;
2111 
2112 release_dev:
2113 	device_del(&session->dev);
2114 release_ida:
2115 	if (session->ida_used)
2116 		ida_free(&iscsi_sess_ida, session->target_id);
2117 destroy_wq:
2118 	destroy_workqueue(session->workq);
2119 	return err;
2120 }
2121 EXPORT_SYMBOL_GPL(iscsi_add_session);
2122 
2123 /**
2124  * iscsi_create_session - create iscsi class session
2125  * @shost: scsi host
2126  * @transport: iscsi transport
2127  * @dd_size: private driver data size
2128  * @target_id: which target
2129  *
2130  * This can be called from a LLD or iscsi_transport.
2131  */
2132 struct iscsi_cls_session *
iscsi_create_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size,unsigned int target_id)2133 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2134 		     int dd_size, unsigned int target_id)
2135 {
2136 	struct iscsi_cls_session *session;
2137 
2138 	session = iscsi_alloc_session(shost, transport, dd_size);
2139 	if (!session)
2140 		return NULL;
2141 
2142 	if (iscsi_add_session(session, target_id)) {
2143 		iscsi_free_session(session);
2144 		return NULL;
2145 	}
2146 	return session;
2147 }
2148 EXPORT_SYMBOL_GPL(iscsi_create_session);
2149 
iscsi_conn_release(struct device * dev)2150 static void iscsi_conn_release(struct device *dev)
2151 {
2152 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2153 	struct device *parent = conn->dev.parent;
2154 
2155 	ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2156 	kfree(conn);
2157 	put_device(parent);
2158 }
2159 
iscsi_is_conn_dev(const struct device * dev)2160 static int iscsi_is_conn_dev(const struct device *dev)
2161 {
2162 	return dev->release == iscsi_conn_release;
2163 }
2164 
iscsi_iter_destroy_conn_fn(struct device * dev,void * data)2165 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2166 {
2167 	if (!iscsi_is_conn_dev(dev))
2168 		return 0;
2169 
2170 	iscsi_remove_conn(iscsi_dev_to_conn(dev));
2171 	return 0;
2172 }
2173 
iscsi_remove_session(struct iscsi_cls_session * session)2174 void iscsi_remove_session(struct iscsi_cls_session *session)
2175 {
2176 	unsigned long flags;
2177 	int err;
2178 
2179 	ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2180 
2181 	spin_lock_irqsave(&sesslock, flags);
2182 	if (!list_empty(&session->sess_list))
2183 		list_del(&session->sess_list);
2184 	spin_unlock_irqrestore(&sesslock, flags);
2185 
2186 	if (!cancel_work_sync(&session->block_work))
2187 		cancel_delayed_work_sync(&session->recovery_work);
2188 	cancel_work_sync(&session->unblock_work);
2189 	/*
2190 	 * If we are blocked let commands flow again. The lld or iscsi
2191 	 * layer should set up the queuecommand to fail commands.
2192 	 * We assume that LLD will not be calling block/unblock while
2193 	 * removing the session.
2194 	 */
2195 	spin_lock_irqsave(&session->lock, flags);
2196 	session->state = ISCSI_SESSION_FREE;
2197 	spin_unlock_irqrestore(&session->lock, flags);
2198 
2199 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2200 	/*
2201 	 * qla4xxx can perform it's own scans when it runs in kernel only
2202 	 * mode. Make sure to flush those scans.
2203 	 */
2204 	flush_work(&session->scan_work);
2205 	/* flush running unbind operations */
2206 	flush_work(&session->unbind_work);
2207 	__iscsi_unbind_session(&session->unbind_work);
2208 
2209 	/* hw iscsi may not have removed all connections from session */
2210 	err = device_for_each_child(&session->dev, NULL,
2211 				    iscsi_iter_destroy_conn_fn);
2212 	if (err)
2213 		iscsi_cls_session_printk(KERN_ERR, session,
2214 					 "Could not delete all connections "
2215 					 "for session. Error %d.\n", err);
2216 
2217 	transport_unregister_device(&session->dev);
2218 
2219 	destroy_workqueue(session->workq);
2220 
2221 	ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2222 	device_del(&session->dev);
2223 }
2224 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2225 
iscsi_stop_conn(struct iscsi_cls_conn * conn,int flag)2226 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2227 {
2228 	ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2229 
2230 	switch (flag) {
2231 	case STOP_CONN_RECOVER:
2232 		WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2233 		break;
2234 	case STOP_CONN_TERM:
2235 		WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2236 		break;
2237 	default:
2238 		iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2239 				      flag);
2240 		return;
2241 	}
2242 
2243 	conn->transport->stop_conn(conn, flag);
2244 	ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2245 }
2246 
iscsi_ep_disconnect(struct iscsi_cls_conn * conn,bool is_active)2247 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2248 {
2249 	struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2250 	struct iscsi_endpoint *ep;
2251 
2252 	ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2253 	WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2254 
2255 	if (!conn->ep || !session->transport->ep_disconnect)
2256 		return;
2257 
2258 	ep = conn->ep;
2259 	conn->ep = NULL;
2260 
2261 	session->transport->unbind_conn(conn, is_active);
2262 	session->transport->ep_disconnect(ep);
2263 	ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2264 }
2265 
iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn * conn,struct iscsi_endpoint * ep,bool is_active)2266 static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
2267 					 struct iscsi_endpoint *ep,
2268 					 bool is_active)
2269 {
2270 	/* Check if this was a conn error and the kernel took ownership */
2271 	spin_lock_irq(&conn->lock);
2272 	if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2273 		spin_unlock_irq(&conn->lock);
2274 		iscsi_ep_disconnect(conn, is_active);
2275 	} else {
2276 		spin_unlock_irq(&conn->lock);
2277 		ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2278 		mutex_unlock(&conn->ep_mutex);
2279 
2280 		flush_work(&conn->cleanup_work);
2281 		/*
2282 		 * Userspace is now done with the EP so we can release the ref
2283 		 * iscsi_cleanup_conn_work_fn took.
2284 		 */
2285 		iscsi_put_endpoint(ep);
2286 		mutex_lock(&conn->ep_mutex);
2287 	}
2288 }
2289 
iscsi_if_stop_conn(struct iscsi_cls_conn * conn,int flag)2290 static int iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2291 {
2292 	ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2293 	/*
2294 	 * For offload, iscsid may not know about the ep like when iscsid is
2295 	 * restarted or for kernel based session shutdown iscsid is not even
2296 	 * up. For these cases, we do the disconnect now.
2297 	 */
2298 	mutex_lock(&conn->ep_mutex);
2299 	if (conn->ep)
2300 		iscsi_if_disconnect_bound_ep(conn, conn->ep, true);
2301 	mutex_unlock(&conn->ep_mutex);
2302 
2303 	/*
2304 	 * If this is a termination we have to call stop_conn with that flag
2305 	 * so the correct states get set. If we haven't run the work yet try to
2306 	 * avoid the extra run.
2307 	 */
2308 	if (flag == STOP_CONN_TERM) {
2309 		cancel_work_sync(&conn->cleanup_work);
2310 		iscsi_stop_conn(conn, flag);
2311 	} else {
2312 		/*
2313 		 * Figure out if it was the kernel or userspace initiating this.
2314 		 */
2315 		spin_lock_irq(&conn->lock);
2316 		if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2317 			spin_unlock_irq(&conn->lock);
2318 			iscsi_stop_conn(conn, flag);
2319 		} else {
2320 			spin_unlock_irq(&conn->lock);
2321 			ISCSI_DBG_TRANS_CONN(conn,
2322 					     "flush kernel conn cleanup.\n");
2323 			flush_work(&conn->cleanup_work);
2324 		}
2325 		/*
2326 		 * Only clear for recovery to avoid extra cleanup runs during
2327 		 * termination.
2328 		 */
2329 		spin_lock_irq(&conn->lock);
2330 		clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2331 		spin_unlock_irq(&conn->lock);
2332 	}
2333 	ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2334 	return 0;
2335 }
2336 
iscsi_cleanup_conn_work_fn(struct work_struct * work)2337 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2338 {
2339 	struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2340 						   cleanup_work);
2341 	struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2342 
2343 	mutex_lock(&conn->ep_mutex);
2344 	/*
2345 	 * Get a ref to the ep, so we don't release its ID until after
2346 	 * userspace is done referencing it in iscsi_if_disconnect_bound_ep.
2347 	 */
2348 	if (conn->ep)
2349 		get_device(&conn->ep->dev);
2350 	iscsi_ep_disconnect(conn, false);
2351 
2352 	if (system_state != SYSTEM_RUNNING) {
2353 		/*
2354 		 * If the user has set up for the session to never timeout
2355 		 * then hang like they wanted. For all other cases fail right
2356 		 * away since userspace is not going to relogin.
2357 		 */
2358 		if (session->recovery_tmo > 0)
2359 			session->recovery_tmo = 0;
2360 	}
2361 
2362 	iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2363 	mutex_unlock(&conn->ep_mutex);
2364 	ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2365 }
2366 
iscsi_iter_force_destroy_conn_fn(struct device * dev,void * data)2367 static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data)
2368 {
2369 	struct iscsi_transport *transport;
2370 	struct iscsi_cls_conn *conn;
2371 
2372 	if (!iscsi_is_conn_dev(dev))
2373 		return 0;
2374 
2375 	conn = iscsi_dev_to_conn(dev);
2376 	transport = conn->transport;
2377 
2378 	if (READ_ONCE(conn->state) != ISCSI_CONN_DOWN)
2379 		iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2380 
2381 	transport->destroy_conn(conn);
2382 	return 0;
2383 }
2384 
2385 /**
2386  * iscsi_force_destroy_session - destroy a session from the kernel
2387  * @session: session to destroy
2388  *
2389  * Force the destruction of a session from the kernel. This should only be
2390  * used when userspace is no longer running during system shutdown.
2391  */
iscsi_force_destroy_session(struct iscsi_cls_session * session)2392 void iscsi_force_destroy_session(struct iscsi_cls_session *session)
2393 {
2394 	struct iscsi_transport *transport = session->transport;
2395 	unsigned long flags;
2396 
2397 	WARN_ON_ONCE(system_state == SYSTEM_RUNNING);
2398 
2399 	spin_lock_irqsave(&sesslock, flags);
2400 	if (list_empty(&session->sess_list)) {
2401 		spin_unlock_irqrestore(&sesslock, flags);
2402 		/*
2403 		 * Conn/ep is already freed. Session is being torn down via
2404 		 * async path. For shutdown we don't care about it so return.
2405 		 */
2406 		return;
2407 	}
2408 	spin_unlock_irqrestore(&sesslock, flags);
2409 
2410 	device_for_each_child(&session->dev, NULL,
2411 			      iscsi_iter_force_destroy_conn_fn);
2412 	transport->destroy_session(session);
2413 }
2414 EXPORT_SYMBOL_GPL(iscsi_force_destroy_session);
2415 
iscsi_free_session(struct iscsi_cls_session * session)2416 void iscsi_free_session(struct iscsi_cls_session *session)
2417 {
2418 	ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2419 	iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2420 	put_device(&session->dev);
2421 }
2422 EXPORT_SYMBOL_GPL(iscsi_free_session);
2423 
2424 /**
2425  * iscsi_alloc_conn - alloc iscsi class connection
2426  * @session: iscsi cls session
2427  * @dd_size: private driver data size
2428  * @cid: connection id
2429  */
2430 struct iscsi_cls_conn *
iscsi_alloc_conn(struct iscsi_cls_session * session,int dd_size,uint32_t cid)2431 iscsi_alloc_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2432 {
2433 	struct iscsi_transport *transport = session->transport;
2434 	struct iscsi_cls_conn *conn;
2435 
2436 	conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2437 	if (!conn)
2438 		return NULL;
2439 	if (dd_size)
2440 		conn->dd_data = &conn[1];
2441 
2442 	mutex_init(&conn->ep_mutex);
2443 	spin_lock_init(&conn->lock);
2444 	INIT_LIST_HEAD(&conn->conn_list);
2445 	INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2446 	conn->transport = transport;
2447 	conn->cid = cid;
2448 	WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2449 
2450 	/* this is released in the dev's release function */
2451 	if (!get_device(&session->dev))
2452 		goto free_conn;
2453 
2454 	dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2455 	device_initialize(&conn->dev);
2456 	conn->dev.parent = &session->dev;
2457 	conn->dev.release = iscsi_conn_release;
2458 
2459 	return conn;
2460 
2461 free_conn:
2462 	kfree(conn);
2463 	return NULL;
2464 }
2465 EXPORT_SYMBOL_GPL(iscsi_alloc_conn);
2466 
2467 /**
2468  * iscsi_add_conn - add iscsi class connection
2469  * @conn: iscsi cls connection
2470  *
2471  * This will expose iscsi_cls_conn to sysfs so make sure the related
2472  * resources for sysfs attributes are initialized before calling this.
2473  */
iscsi_add_conn(struct iscsi_cls_conn * conn)2474 int iscsi_add_conn(struct iscsi_cls_conn *conn)
2475 {
2476 	int err;
2477 	unsigned long flags;
2478 	struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent);
2479 
2480 	err = device_add(&conn->dev);
2481 	if (err) {
2482 		iscsi_cls_session_printk(KERN_ERR, session,
2483 					 "could not register connection's dev\n");
2484 		return err;
2485 	}
2486 	err = transport_register_device(&conn->dev);
2487 	if (err) {
2488 		iscsi_cls_session_printk(KERN_ERR, session,
2489 					 "could not register transport's dev\n");
2490 		device_del(&conn->dev);
2491 		return err;
2492 	}
2493 
2494 	spin_lock_irqsave(&connlock, flags);
2495 	list_add(&conn->conn_list, &connlist);
2496 	spin_unlock_irqrestore(&connlock, flags);
2497 
2498 	return 0;
2499 }
2500 EXPORT_SYMBOL_GPL(iscsi_add_conn);
2501 
2502 /**
2503  * iscsi_remove_conn - remove iscsi class connection from sysfs
2504  * @conn: iscsi cls connection
2505  *
2506  * Remove iscsi_cls_conn from sysfs, and wait for previous
2507  * read/write of iscsi_cls_conn's attributes in sysfs to finish.
2508  */
iscsi_remove_conn(struct iscsi_cls_conn * conn)2509 void iscsi_remove_conn(struct iscsi_cls_conn *conn)
2510 {
2511 	unsigned long flags;
2512 
2513 	spin_lock_irqsave(&connlock, flags);
2514 	list_del(&conn->conn_list);
2515 	spin_unlock_irqrestore(&connlock, flags);
2516 
2517 	transport_unregister_device(&conn->dev);
2518 	device_del(&conn->dev);
2519 }
2520 EXPORT_SYMBOL_GPL(iscsi_remove_conn);
2521 
iscsi_put_conn(struct iscsi_cls_conn * conn)2522 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2523 {
2524 	put_device(&conn->dev);
2525 }
2526 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2527 
iscsi_get_conn(struct iscsi_cls_conn * conn)2528 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2529 {
2530 	get_device(&conn->dev);
2531 }
2532 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2533 
2534 /*
2535  * iscsi interface functions
2536  */
2537 static struct iscsi_internal *
iscsi_if_transport_lookup(struct iscsi_transport * tt)2538 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2539 {
2540 	struct iscsi_internal *priv;
2541 	unsigned long flags;
2542 
2543 	spin_lock_irqsave(&iscsi_transport_lock, flags);
2544 	list_for_each_entry(priv, &iscsi_transports, list) {
2545 		if (tt == priv->iscsi_transport) {
2546 			spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2547 			return priv;
2548 		}
2549 	}
2550 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2551 	return NULL;
2552 }
2553 
2554 static int
iscsi_multicast_skb(struct sk_buff * skb,uint32_t group,gfp_t gfp)2555 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2556 {
2557 	return nlmsg_multicast(nls, skb, 0, group, gfp);
2558 }
2559 
2560 static int
iscsi_unicast_skb(struct sk_buff * skb,u32 portid)2561 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2562 {
2563 	return nlmsg_unicast(nls, skb, portid);
2564 }
2565 
iscsi_recv_pdu(struct iscsi_cls_conn * conn,struct iscsi_hdr * hdr,char * data,uint32_t data_size)2566 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2567 		   char *data, uint32_t data_size)
2568 {
2569 	struct nlmsghdr	*nlh;
2570 	struct sk_buff *skb;
2571 	struct iscsi_uevent *ev;
2572 	char *pdu;
2573 	struct iscsi_internal *priv;
2574 	int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2575 				   data_size);
2576 
2577 	priv = iscsi_if_transport_lookup(conn->transport);
2578 	if (!priv)
2579 		return -EINVAL;
2580 
2581 	skb = alloc_skb(len, GFP_ATOMIC);
2582 	if (!skb) {
2583 		iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2584 		iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2585 				      "control PDU: OOM\n");
2586 		return -ENOMEM;
2587 	}
2588 
2589 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2590 	ev = nlmsg_data(nlh);
2591 	memset(ev, 0, sizeof(*ev));
2592 	ev->transport_handle = iscsi_handle(conn->transport);
2593 	ev->type = ISCSI_KEVENT_RECV_PDU;
2594 	ev->r.recv_req.cid = conn->cid;
2595 	ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2596 	pdu = (char*)ev + sizeof(*ev);
2597 	memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2598 	memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2599 
2600 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2601 }
2602 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2603 
iscsi_offload_mesg(struct Scsi_Host * shost,struct iscsi_transport * transport,uint32_t type,char * data,uint16_t data_size)2604 int iscsi_offload_mesg(struct Scsi_Host *shost,
2605 		       struct iscsi_transport *transport, uint32_t type,
2606 		       char *data, uint16_t data_size)
2607 {
2608 	struct nlmsghdr	*nlh;
2609 	struct sk_buff *skb;
2610 	struct iscsi_uevent *ev;
2611 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2612 
2613 	skb = alloc_skb(len, GFP_ATOMIC);
2614 	if (!skb) {
2615 		printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2616 		return -ENOMEM;
2617 	}
2618 
2619 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2620 	ev = nlmsg_data(nlh);
2621 	memset(ev, 0, sizeof(*ev));
2622 	ev->type = type;
2623 	ev->transport_handle = iscsi_handle(transport);
2624 	switch (type) {
2625 	case ISCSI_KEVENT_PATH_REQ:
2626 		ev->r.req_path.host_no = shost->host_no;
2627 		break;
2628 	case ISCSI_KEVENT_IF_DOWN:
2629 		ev->r.notify_if_down.host_no = shost->host_no;
2630 		break;
2631 	}
2632 
2633 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2634 
2635 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2636 }
2637 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2638 
iscsi_conn_error_event(struct iscsi_cls_conn * conn,enum iscsi_err error)2639 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2640 {
2641 	struct nlmsghdr	*nlh;
2642 	struct sk_buff	*skb;
2643 	struct iscsi_uevent *ev;
2644 	struct iscsi_internal *priv;
2645 	int len = nlmsg_total_size(sizeof(*ev));
2646 	unsigned long flags;
2647 	int state;
2648 
2649 	spin_lock_irqsave(&conn->lock, flags);
2650 	/*
2651 	 * Userspace will only do a stop call if we are at least bound. And, we
2652 	 * only need to do the in kernel cleanup if in the UP state so cmds can
2653 	 * be released to upper layers. If in other states just wait for
2654 	 * userspace to avoid races that can leave the cleanup_work queued.
2655 	 */
2656 	state = READ_ONCE(conn->state);
2657 	switch (state) {
2658 	case ISCSI_CONN_BOUND:
2659 	case ISCSI_CONN_UP:
2660 		if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP,
2661 				      &conn->flags)) {
2662 			queue_work(iscsi_conn_cleanup_workq,
2663 				   &conn->cleanup_work);
2664 		}
2665 		break;
2666 	default:
2667 		ISCSI_DBG_TRANS_CONN(conn, "Got conn error in state %d\n",
2668 				     state);
2669 		break;
2670 	}
2671 	spin_unlock_irqrestore(&conn->lock, flags);
2672 
2673 	priv = iscsi_if_transport_lookup(conn->transport);
2674 	if (!priv)
2675 		return;
2676 
2677 	skb = alloc_skb(len, GFP_ATOMIC);
2678 	if (!skb) {
2679 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2680 				      "conn error (%d)\n", error);
2681 		return;
2682 	}
2683 
2684 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2685 	ev = nlmsg_data(nlh);
2686 	ev->transport_handle = iscsi_handle(conn->transport);
2687 	ev->type = ISCSI_KEVENT_CONN_ERROR;
2688 	ev->r.connerror.error = error;
2689 	ev->r.connerror.cid = conn->cid;
2690 	ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2691 
2692 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2693 
2694 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2695 			      error);
2696 }
2697 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2698 
iscsi_conn_login_event(struct iscsi_cls_conn * conn,enum iscsi_conn_state state)2699 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2700 			    enum iscsi_conn_state state)
2701 {
2702 	struct nlmsghdr *nlh;
2703 	struct sk_buff  *skb;
2704 	struct iscsi_uevent *ev;
2705 	struct iscsi_internal *priv;
2706 	int len = nlmsg_total_size(sizeof(*ev));
2707 
2708 	priv = iscsi_if_transport_lookup(conn->transport);
2709 	if (!priv)
2710 		return;
2711 
2712 	skb = alloc_skb(len, GFP_ATOMIC);
2713 	if (!skb) {
2714 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2715 				      "conn login (%d)\n", state);
2716 		return;
2717 	}
2718 
2719 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2720 	ev = nlmsg_data(nlh);
2721 	ev->transport_handle = iscsi_handle(conn->transport);
2722 	ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2723 	ev->r.conn_login.state = state;
2724 	ev->r.conn_login.cid = conn->cid;
2725 	ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2726 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2727 
2728 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2729 			      state);
2730 }
2731 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2732 
iscsi_post_host_event(uint32_t host_no,struct iscsi_transport * transport,enum iscsi_host_event_code code,uint32_t data_size,uint8_t * data)2733 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2734 			   enum iscsi_host_event_code code, uint32_t data_size,
2735 			   uint8_t *data)
2736 {
2737 	struct nlmsghdr *nlh;
2738 	struct sk_buff *skb;
2739 	struct iscsi_uevent *ev;
2740 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2741 
2742 	skb = alloc_skb(len, GFP_NOIO);
2743 	if (!skb) {
2744 		printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2745 		       host_no, code);
2746 		return;
2747 	}
2748 
2749 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2750 	ev = nlmsg_data(nlh);
2751 	ev->transport_handle = iscsi_handle(transport);
2752 	ev->type = ISCSI_KEVENT_HOST_EVENT;
2753 	ev->r.host_event.host_no = host_no;
2754 	ev->r.host_event.code = code;
2755 	ev->r.host_event.data_size = data_size;
2756 
2757 	if (data_size)
2758 		memcpy((char *)ev + sizeof(*ev), data, data_size);
2759 
2760 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2761 }
2762 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2763 
iscsi_ping_comp_event(uint32_t host_no,struct iscsi_transport * transport,uint32_t status,uint32_t pid,uint32_t data_size,uint8_t * data)2764 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2765 			   uint32_t status, uint32_t pid, uint32_t data_size,
2766 			   uint8_t *data)
2767 {
2768 	struct nlmsghdr *nlh;
2769 	struct sk_buff *skb;
2770 	struct iscsi_uevent *ev;
2771 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2772 
2773 	skb = alloc_skb(len, GFP_NOIO);
2774 	if (!skb) {
2775 		printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2776 		return;
2777 	}
2778 
2779 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2780 	ev = nlmsg_data(nlh);
2781 	ev->transport_handle = iscsi_handle(transport);
2782 	ev->type = ISCSI_KEVENT_PING_COMP;
2783 	ev->r.ping_comp.host_no = host_no;
2784 	ev->r.ping_comp.status = status;
2785 	ev->r.ping_comp.pid = pid;
2786 	ev->r.ping_comp.data_size = data_size;
2787 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2788 
2789 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2790 }
2791 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2792 
2793 static int
iscsi_if_send_reply(u32 portid,int type,void * payload,int size)2794 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2795 {
2796 	struct sk_buff	*skb;
2797 	struct nlmsghdr	*nlh;
2798 	int len = nlmsg_total_size(size);
2799 
2800 	skb = alloc_skb(len, GFP_ATOMIC);
2801 	if (!skb) {
2802 		printk(KERN_ERR "Could not allocate skb to send reply.\n");
2803 		return -ENOMEM;
2804 	}
2805 
2806 	nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2807 	memcpy(nlmsg_data(nlh), payload, size);
2808 	return iscsi_unicast_skb(skb, portid);
2809 }
2810 
2811 static int
iscsi_if_get_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)2812 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2813 {
2814 	struct iscsi_uevent *ev = nlmsg_data(nlh);
2815 	struct iscsi_stats *stats;
2816 	struct sk_buff *skbstat;
2817 	struct iscsi_cls_conn *conn;
2818 	struct nlmsghdr	*nlhstat;
2819 	struct iscsi_uevent *evstat;
2820 	struct iscsi_internal *priv;
2821 	int len = nlmsg_total_size(sizeof(*ev) +
2822 				   sizeof(struct iscsi_stats) +
2823 				   sizeof(struct iscsi_stats_custom) *
2824 				   ISCSI_STATS_CUSTOM_MAX);
2825 	int err = 0;
2826 
2827 	priv = iscsi_if_transport_lookup(transport);
2828 	if (!priv)
2829 		return -EINVAL;
2830 
2831 	conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2832 	if (!conn)
2833 		return -EEXIST;
2834 
2835 	do {
2836 		int actual_size;
2837 
2838 		skbstat = alloc_skb(len, GFP_ATOMIC);
2839 		if (!skbstat) {
2840 			iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2841 					      "deliver stats: OOM\n");
2842 			return -ENOMEM;
2843 		}
2844 
2845 		nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2846 				      (len - sizeof(*nlhstat)), 0);
2847 		evstat = nlmsg_data(nlhstat);
2848 		memset(evstat, 0, sizeof(*evstat));
2849 		evstat->transport_handle = iscsi_handle(conn->transport);
2850 		evstat->type = nlh->nlmsg_type;
2851 		evstat->u.get_stats.cid =
2852 			ev->u.get_stats.cid;
2853 		evstat->u.get_stats.sid =
2854 			ev->u.get_stats.sid;
2855 		stats = (struct iscsi_stats *)
2856 			((char*)evstat + sizeof(*evstat));
2857 		memset(stats, 0, sizeof(*stats));
2858 
2859 		transport->get_stats(conn, stats);
2860 		actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2861 					       sizeof(struct iscsi_stats) +
2862 					       sizeof(struct iscsi_stats_custom) *
2863 					       stats->custom_length);
2864 		actual_size -= sizeof(*nlhstat);
2865 		actual_size = nlmsg_msg_size(actual_size);
2866 		skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2867 		nlhstat->nlmsg_len = actual_size;
2868 
2869 		err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2870 					  GFP_ATOMIC);
2871 	} while (err < 0 && err != -ECONNREFUSED);
2872 
2873 	return err;
2874 }
2875 
2876 /**
2877  * iscsi_session_event - send session destr. completion event
2878  * @session: iscsi class session
2879  * @event: type of event
2880  */
iscsi_session_event(struct iscsi_cls_session * session,enum iscsi_uevent_e event)2881 int iscsi_session_event(struct iscsi_cls_session *session,
2882 			enum iscsi_uevent_e event)
2883 {
2884 	struct iscsi_internal *priv;
2885 	struct Scsi_Host *shost;
2886 	struct iscsi_uevent *ev;
2887 	struct sk_buff  *skb;
2888 	struct nlmsghdr *nlh;
2889 	int rc, len = nlmsg_total_size(sizeof(*ev));
2890 
2891 	priv = iscsi_if_transport_lookup(session->transport);
2892 	if (!priv)
2893 		return -EINVAL;
2894 	shost = iscsi_session_to_shost(session);
2895 
2896 	skb = alloc_skb(len, GFP_KERNEL);
2897 	if (!skb) {
2898 		iscsi_cls_session_printk(KERN_ERR, session,
2899 					 "Cannot notify userspace of session "
2900 					 "event %u\n", event);
2901 		return -ENOMEM;
2902 	}
2903 
2904 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2905 	ev = nlmsg_data(nlh);
2906 	ev->transport_handle = iscsi_handle(session->transport);
2907 
2908 	ev->type = event;
2909 	switch (event) {
2910 	case ISCSI_KEVENT_DESTROY_SESSION:
2911 		ev->r.d_session.host_no = shost->host_no;
2912 		ev->r.d_session.sid = session->sid;
2913 		break;
2914 	case ISCSI_KEVENT_CREATE_SESSION:
2915 		ev->r.c_session_ret.host_no = shost->host_no;
2916 		ev->r.c_session_ret.sid = session->sid;
2917 		break;
2918 	case ISCSI_KEVENT_UNBIND_SESSION:
2919 		ev->r.unbind_session.host_no = shost->host_no;
2920 		ev->r.unbind_session.sid = session->sid;
2921 		break;
2922 	default:
2923 		iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2924 					 "%u.\n", event);
2925 		kfree_skb(skb);
2926 		return -EINVAL;
2927 	}
2928 
2929 	/*
2930 	 * this will occur if the daemon is not up, so we just warn
2931 	 * the user and when the daemon is restarted it will handle it
2932 	 */
2933 	rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2934 	if (rc == -ESRCH)
2935 		iscsi_cls_session_printk(KERN_ERR, session,
2936 					 "Cannot notify userspace of session "
2937 					 "event %u. Check iscsi daemon\n",
2938 					 event);
2939 
2940 	ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2941 				event, rc);
2942 	return rc;
2943 }
2944 EXPORT_SYMBOL_GPL(iscsi_session_event);
2945 
2946 static int
iscsi_if_create_session(struct iscsi_internal * priv,struct iscsi_endpoint * ep,struct iscsi_uevent * ev,pid_t pid,uint32_t initial_cmdsn,uint16_t cmds_max,uint16_t queue_depth)2947 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2948 			struct iscsi_uevent *ev, pid_t pid,
2949 			uint32_t initial_cmdsn,	uint16_t cmds_max,
2950 			uint16_t queue_depth)
2951 {
2952 	struct iscsi_transport *transport = priv->iscsi_transport;
2953 	struct iscsi_cls_session *session;
2954 	struct Scsi_Host *shost;
2955 
2956 	session = transport->create_session(ep, cmds_max, queue_depth,
2957 					    initial_cmdsn);
2958 	if (!session)
2959 		return -ENOMEM;
2960 
2961 	session->creator = pid;
2962 	shost = iscsi_session_to_shost(session);
2963 	ev->r.c_session_ret.host_no = shost->host_no;
2964 	ev->r.c_session_ret.sid = session->sid;
2965 	ISCSI_DBG_TRANS_SESSION(session,
2966 				"Completed creating transport session\n");
2967 	return 0;
2968 }
2969 
2970 static int
iscsi_if_create_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)2971 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2972 {
2973 	struct iscsi_cls_conn *conn;
2974 	struct iscsi_cls_session *session;
2975 
2976 	session = iscsi_session_lookup(ev->u.c_conn.sid);
2977 	if (!session) {
2978 		printk(KERN_ERR "iscsi: invalid session %d.\n",
2979 		       ev->u.c_conn.sid);
2980 		return -EINVAL;
2981 	}
2982 
2983 	conn = transport->create_conn(session, ev->u.c_conn.cid);
2984 	if (!conn) {
2985 		iscsi_cls_session_printk(KERN_ERR, session,
2986 					 "couldn't create a new connection.");
2987 		return -ENOMEM;
2988 	}
2989 
2990 	ev->r.c_conn_ret.sid = session->sid;
2991 	ev->r.c_conn_ret.cid = conn->cid;
2992 
2993 	ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2994 	return 0;
2995 }
2996 
2997 static int
iscsi_if_destroy_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)2998 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2999 {
3000 	struct iscsi_cls_conn *conn;
3001 
3002 	conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
3003 	if (!conn)
3004 		return -EINVAL;
3005 
3006 	ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
3007 	flush_work(&conn->cleanup_work);
3008 	ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
3009 
3010 	if (transport->destroy_conn)
3011 		transport->destroy_conn(conn);
3012 	return 0;
3013 }
3014 
3015 static int
iscsi_set_param(struct iscsi_transport * transport,struct iscsi_uevent * ev)3016 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3017 {
3018 	char *data = (char*)ev + sizeof(*ev);
3019 	struct iscsi_cls_conn *conn;
3020 	struct iscsi_cls_session *session;
3021 	int err = 0, value = 0, state;
3022 
3023 	if (ev->u.set_param.len > PAGE_SIZE)
3024 		return -EINVAL;
3025 
3026 	session = iscsi_session_lookup(ev->u.set_param.sid);
3027 	conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
3028 	if (!conn || !session)
3029 		return -EINVAL;
3030 
3031 	switch (ev->u.set_param.param) {
3032 	case ISCSI_PARAM_SESS_RECOVERY_TMO:
3033 		sscanf(data, "%d", &value);
3034 		if (!session->recovery_tmo_sysfs_override)
3035 			session->recovery_tmo = value;
3036 		break;
3037 	default:
3038 		state = READ_ONCE(conn->state);
3039 		if (state == ISCSI_CONN_BOUND || state == ISCSI_CONN_UP) {
3040 			err = transport->set_param(conn, ev->u.set_param.param,
3041 					data, ev->u.set_param.len);
3042 		} else {
3043 			return -ENOTCONN;
3044 		}
3045 	}
3046 
3047 	return err;
3048 }
3049 
iscsi_if_ep_connect(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type)3050 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
3051 			       struct iscsi_uevent *ev, int msg_type)
3052 {
3053 	struct iscsi_endpoint *ep;
3054 	struct sockaddr *dst_addr;
3055 	struct Scsi_Host *shost = NULL;
3056 	int non_blocking, err = 0;
3057 
3058 	if (!transport->ep_connect)
3059 		return -EINVAL;
3060 
3061 	if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
3062 		shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
3063 		if (!shost) {
3064 			printk(KERN_ERR "ep connect failed. Could not find "
3065 			       "host no %u\n",
3066 			       ev->u.ep_connect_through_host.host_no);
3067 			return -ENODEV;
3068 		}
3069 		non_blocking = ev->u.ep_connect_through_host.non_blocking;
3070 	} else
3071 		non_blocking = ev->u.ep_connect.non_blocking;
3072 
3073 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3074 	ep = transport->ep_connect(shost, dst_addr, non_blocking);
3075 	if (IS_ERR(ep)) {
3076 		err = PTR_ERR(ep);
3077 		goto release_host;
3078 	}
3079 
3080 	ev->r.ep_connect_ret.handle = ep->id;
3081 release_host:
3082 	if (shost)
3083 		scsi_host_put(shost);
3084 	return err;
3085 }
3086 
iscsi_if_ep_disconnect(struct iscsi_transport * transport,u64 ep_handle)3087 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3088 				  u64 ep_handle)
3089 {
3090 	struct iscsi_cls_conn *conn;
3091 	struct iscsi_endpoint *ep;
3092 
3093 	if (!transport->ep_disconnect)
3094 		return -EINVAL;
3095 
3096 	ep = iscsi_lookup_endpoint(ep_handle);
3097 	if (!ep)
3098 		return -EINVAL;
3099 
3100 	conn = ep->conn;
3101 	if (!conn) {
3102 		/*
3103 		 * conn was not even bound yet, so we can't get iscsi conn
3104 		 * failures yet.
3105 		 */
3106 		transport->ep_disconnect(ep);
3107 		goto put_ep;
3108 	}
3109 
3110 	mutex_lock(&conn->ep_mutex);
3111 	iscsi_if_disconnect_bound_ep(conn, ep, false);
3112 	mutex_unlock(&conn->ep_mutex);
3113 put_ep:
3114 	iscsi_put_endpoint(ep);
3115 	return 0;
3116 }
3117 
3118 static int
iscsi_if_transport_ep(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type)3119 iscsi_if_transport_ep(struct iscsi_transport *transport,
3120 		      struct iscsi_uevent *ev, int msg_type)
3121 {
3122 	struct iscsi_endpoint *ep;
3123 	int rc = 0;
3124 
3125 	switch (msg_type) {
3126 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3127 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3128 		rc = iscsi_if_ep_connect(transport, ev, msg_type);
3129 		break;
3130 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3131 		if (!transport->ep_poll)
3132 			return -EINVAL;
3133 
3134 		ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3135 		if (!ep)
3136 			return -EINVAL;
3137 
3138 		ev->r.retcode = transport->ep_poll(ep,
3139 						   ev->u.ep_poll.timeout_ms);
3140 		iscsi_put_endpoint(ep);
3141 		break;
3142 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3143 		rc = iscsi_if_ep_disconnect(transport,
3144 					    ev->u.ep_disconnect.ep_handle);
3145 		break;
3146 	}
3147 	return rc;
3148 }
3149 
3150 static int
iscsi_tgt_dscvr(struct iscsi_transport * transport,struct iscsi_uevent * ev)3151 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3152 		struct iscsi_uevent *ev)
3153 {
3154 	struct Scsi_Host *shost;
3155 	struct sockaddr *dst_addr;
3156 	int err;
3157 
3158 	if (!transport->tgt_dscvr)
3159 		return -EINVAL;
3160 
3161 	shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3162 	if (!shost) {
3163 		printk(KERN_ERR "target discovery could not find host no %u\n",
3164 		       ev->u.tgt_dscvr.host_no);
3165 		return -ENODEV;
3166 	}
3167 
3168 
3169 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3170 	err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3171 				   ev->u.tgt_dscvr.enable, dst_addr);
3172 	scsi_host_put(shost);
3173 	return err;
3174 }
3175 
3176 static int
iscsi_set_host_param(struct iscsi_transport * transport,struct iscsi_uevent * ev)3177 iscsi_set_host_param(struct iscsi_transport *transport,
3178 		     struct iscsi_uevent *ev)
3179 {
3180 	char *data = (char*)ev + sizeof(*ev);
3181 	struct Scsi_Host *shost;
3182 	int err;
3183 
3184 	if (!transport->set_host_param)
3185 		return -ENOSYS;
3186 
3187 	if (ev->u.set_host_param.len > PAGE_SIZE)
3188 		return -EINVAL;
3189 
3190 	shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3191 	if (!shost) {
3192 		printk(KERN_ERR "set_host_param could not find host no %u\n",
3193 		       ev->u.set_host_param.host_no);
3194 		return -ENODEV;
3195 	}
3196 
3197 	err = transport->set_host_param(shost, ev->u.set_host_param.param,
3198 					data, ev->u.set_host_param.len);
3199 	scsi_host_put(shost);
3200 	return err;
3201 }
3202 
3203 static int
iscsi_set_path(struct iscsi_transport * transport,struct iscsi_uevent * ev)3204 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3205 {
3206 	struct Scsi_Host *shost;
3207 	struct iscsi_path *params;
3208 	int err;
3209 
3210 	if (!transport->set_path)
3211 		return -ENOSYS;
3212 
3213 	shost = scsi_host_lookup(ev->u.set_path.host_no);
3214 	if (!shost) {
3215 		printk(KERN_ERR "set path could not find host no %u\n",
3216 		       ev->u.set_path.host_no);
3217 		return -ENODEV;
3218 	}
3219 
3220 	params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3221 	err = transport->set_path(shost, params);
3222 
3223 	scsi_host_put(shost);
3224 	return err;
3225 }
3226 
iscsi_session_has_conns(int sid)3227 static int iscsi_session_has_conns(int sid)
3228 {
3229 	struct iscsi_cls_conn *conn;
3230 	unsigned long flags;
3231 	int found = 0;
3232 
3233 	spin_lock_irqsave(&connlock, flags);
3234 	list_for_each_entry(conn, &connlist, conn_list) {
3235 		if (iscsi_conn_get_sid(conn) == sid) {
3236 			found = 1;
3237 			break;
3238 		}
3239 	}
3240 	spin_unlock_irqrestore(&connlock, flags);
3241 
3242 	return found;
3243 }
3244 
3245 static int
iscsi_set_iface_params(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3246 iscsi_set_iface_params(struct iscsi_transport *transport,
3247 		       struct iscsi_uevent *ev, uint32_t len)
3248 {
3249 	char *data = (char *)ev + sizeof(*ev);
3250 	struct Scsi_Host *shost;
3251 	int err;
3252 
3253 	if (!transport->set_iface_param)
3254 		return -ENOSYS;
3255 
3256 	shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3257 	if (!shost) {
3258 		printk(KERN_ERR "set_iface_params could not find host no %u\n",
3259 		       ev->u.set_iface_params.host_no);
3260 		return -ENODEV;
3261 	}
3262 
3263 	err = transport->set_iface_param(shost, data, len);
3264 	scsi_host_put(shost);
3265 	return err;
3266 }
3267 
3268 static int
iscsi_send_ping(struct iscsi_transport * transport,struct iscsi_uevent * ev)3269 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3270 {
3271 	struct Scsi_Host *shost;
3272 	struct sockaddr *dst_addr;
3273 	int err;
3274 
3275 	if (!transport->send_ping)
3276 		return -ENOSYS;
3277 
3278 	shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3279 	if (!shost) {
3280 		printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3281 		       ev->u.iscsi_ping.host_no);
3282 		return -ENODEV;
3283 	}
3284 
3285 	dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3286 	err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3287 				   ev->u.iscsi_ping.iface_type,
3288 				   ev->u.iscsi_ping.payload_size,
3289 				   ev->u.iscsi_ping.pid,
3290 				   dst_addr);
3291 	scsi_host_put(shost);
3292 	return err;
3293 }
3294 
3295 static int
iscsi_get_chap(struct iscsi_transport * transport,struct nlmsghdr * nlh)3296 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3297 {
3298 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3299 	struct Scsi_Host *shost = NULL;
3300 	struct iscsi_chap_rec *chap_rec;
3301 	struct iscsi_internal *priv;
3302 	struct sk_buff *skbchap;
3303 	struct nlmsghdr *nlhchap;
3304 	struct iscsi_uevent *evchap;
3305 	uint32_t chap_buf_size;
3306 	int len, err = 0;
3307 	char *buf;
3308 
3309 	if (!transport->get_chap)
3310 		return -EINVAL;
3311 
3312 	priv = iscsi_if_transport_lookup(transport);
3313 	if (!priv)
3314 		return -EINVAL;
3315 
3316 	chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3317 	len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3318 
3319 	shost = scsi_host_lookup(ev->u.get_chap.host_no);
3320 	if (!shost) {
3321 		printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3322 		       __func__, ev->u.get_chap.host_no);
3323 		return -ENODEV;
3324 	}
3325 
3326 	do {
3327 		int actual_size;
3328 
3329 		skbchap = alloc_skb(len, GFP_KERNEL);
3330 		if (!skbchap) {
3331 			printk(KERN_ERR "can not deliver chap: OOM\n");
3332 			err = -ENOMEM;
3333 			goto exit_get_chap;
3334 		}
3335 
3336 		nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3337 				      (len - sizeof(*nlhchap)), 0);
3338 		evchap = nlmsg_data(nlhchap);
3339 		memset(evchap, 0, sizeof(*evchap));
3340 		evchap->transport_handle = iscsi_handle(transport);
3341 		evchap->type = nlh->nlmsg_type;
3342 		evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3343 		evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3344 		evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3345 		buf = (char *)evchap + sizeof(*evchap);
3346 		memset(buf, 0, chap_buf_size);
3347 
3348 		err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3349 				    &evchap->u.get_chap.num_entries, buf);
3350 
3351 		actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3352 		skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3353 		nlhchap->nlmsg_len = actual_size;
3354 
3355 		err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3356 					  GFP_KERNEL);
3357 	} while (err < 0 && err != -ECONNREFUSED);
3358 
3359 exit_get_chap:
3360 	scsi_host_put(shost);
3361 	return err;
3362 }
3363 
iscsi_set_chap(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3364 static int iscsi_set_chap(struct iscsi_transport *transport,
3365 			  struct iscsi_uevent *ev, uint32_t len)
3366 {
3367 	char *data = (char *)ev + sizeof(*ev);
3368 	struct Scsi_Host *shost;
3369 	int err = 0;
3370 
3371 	if (!transport->set_chap)
3372 		return -ENOSYS;
3373 
3374 	shost = scsi_host_lookup(ev->u.set_path.host_no);
3375 	if (!shost) {
3376 		pr_err("%s could not find host no %u\n",
3377 		       __func__, ev->u.set_path.host_no);
3378 		return -ENODEV;
3379 	}
3380 
3381 	err = transport->set_chap(shost, data, len);
3382 	scsi_host_put(shost);
3383 	return err;
3384 }
3385 
iscsi_delete_chap(struct iscsi_transport * transport,struct iscsi_uevent * ev)3386 static int iscsi_delete_chap(struct iscsi_transport *transport,
3387 			     struct iscsi_uevent *ev)
3388 {
3389 	struct Scsi_Host *shost;
3390 	int err = 0;
3391 
3392 	if (!transport->delete_chap)
3393 		return -ENOSYS;
3394 
3395 	shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3396 	if (!shost) {
3397 		printk(KERN_ERR "%s could not find host no %u\n",
3398 		       __func__, ev->u.delete_chap.host_no);
3399 		return -ENODEV;
3400 	}
3401 
3402 	err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3403 	scsi_host_put(shost);
3404 	return err;
3405 }
3406 
3407 static const struct {
3408 	enum iscsi_discovery_parent_type value;
3409 	char				*name;
3410 } iscsi_discovery_parent_names[] = {
3411 	{ISCSI_DISC_PARENT_UNKNOWN,	"Unknown" },
3412 	{ISCSI_DISC_PARENT_SENDTGT,	"Sendtarget" },
3413 	{ISCSI_DISC_PARENT_ISNS,	"isns" },
3414 };
3415 
iscsi_get_discovery_parent_name(int parent_type)3416 char *iscsi_get_discovery_parent_name(int parent_type)
3417 {
3418 	int i;
3419 	char *state = "Unknown!";
3420 
3421 	for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3422 		if (iscsi_discovery_parent_names[i].value & parent_type) {
3423 			state = iscsi_discovery_parent_names[i].name;
3424 			break;
3425 		}
3426 	}
3427 	return state;
3428 }
3429 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3430 
iscsi_set_flashnode_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3431 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3432 				     struct iscsi_uevent *ev, uint32_t len)
3433 {
3434 	char *data = (char *)ev + sizeof(*ev);
3435 	struct Scsi_Host *shost;
3436 	struct iscsi_bus_flash_session *fnode_sess;
3437 	struct iscsi_bus_flash_conn *fnode_conn;
3438 	struct device *dev;
3439 	uint32_t idx;
3440 	int err = 0;
3441 
3442 	if (!transport->set_flashnode_param) {
3443 		err = -ENOSYS;
3444 		goto exit_set_fnode;
3445 	}
3446 
3447 	shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3448 	if (!shost) {
3449 		pr_err("%s could not find host no %u\n",
3450 		       __func__, ev->u.set_flashnode.host_no);
3451 		err = -ENODEV;
3452 		goto exit_set_fnode;
3453 	}
3454 
3455 	idx = ev->u.set_flashnode.flashnode_idx;
3456 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3457 	if (!fnode_sess) {
3458 		pr_err("%s could not find flashnode %u for host no %u\n",
3459 		       __func__, idx, ev->u.set_flashnode.host_no);
3460 		err = -ENODEV;
3461 		goto put_host;
3462 	}
3463 
3464 	dev = iscsi_find_flashnode_conn(fnode_sess);
3465 	if (!dev) {
3466 		err = -ENODEV;
3467 		goto put_sess;
3468 	}
3469 
3470 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3471 	err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3472 	put_device(dev);
3473 
3474 put_sess:
3475 	put_device(&fnode_sess->dev);
3476 
3477 put_host:
3478 	scsi_host_put(shost);
3479 
3480 exit_set_fnode:
3481 	return err;
3482 }
3483 
iscsi_new_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3484 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3485 			       struct iscsi_uevent *ev, uint32_t len)
3486 {
3487 	char *data = (char *)ev + sizeof(*ev);
3488 	struct Scsi_Host *shost;
3489 	int index;
3490 	int err = 0;
3491 
3492 	if (!transport->new_flashnode) {
3493 		err = -ENOSYS;
3494 		goto exit_new_fnode;
3495 	}
3496 
3497 	shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3498 	if (!shost) {
3499 		pr_err("%s could not find host no %u\n",
3500 		       __func__, ev->u.new_flashnode.host_no);
3501 		err = -ENODEV;
3502 		goto put_host;
3503 	}
3504 
3505 	index = transport->new_flashnode(shost, data, len);
3506 
3507 	if (index >= 0)
3508 		ev->r.new_flashnode_ret.flashnode_idx = index;
3509 	else
3510 		err = -EIO;
3511 
3512 put_host:
3513 	scsi_host_put(shost);
3514 
3515 exit_new_fnode:
3516 	return err;
3517 }
3518 
iscsi_del_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3519 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3520 			       struct iscsi_uevent *ev)
3521 {
3522 	struct Scsi_Host *shost;
3523 	struct iscsi_bus_flash_session *fnode_sess;
3524 	uint32_t idx;
3525 	int err = 0;
3526 
3527 	if (!transport->del_flashnode) {
3528 		err = -ENOSYS;
3529 		goto exit_del_fnode;
3530 	}
3531 
3532 	shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3533 	if (!shost) {
3534 		pr_err("%s could not find host no %u\n",
3535 		       __func__, ev->u.del_flashnode.host_no);
3536 		err = -ENODEV;
3537 		goto put_host;
3538 	}
3539 
3540 	idx = ev->u.del_flashnode.flashnode_idx;
3541 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3542 	if (!fnode_sess) {
3543 		pr_err("%s could not find flashnode %u for host no %u\n",
3544 		       __func__, idx, ev->u.del_flashnode.host_no);
3545 		err = -ENODEV;
3546 		goto put_host;
3547 	}
3548 
3549 	err = transport->del_flashnode(fnode_sess);
3550 	put_device(&fnode_sess->dev);
3551 
3552 put_host:
3553 	scsi_host_put(shost);
3554 
3555 exit_del_fnode:
3556 	return err;
3557 }
3558 
iscsi_login_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3559 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3560 				 struct iscsi_uevent *ev)
3561 {
3562 	struct Scsi_Host *shost;
3563 	struct iscsi_bus_flash_session *fnode_sess;
3564 	struct iscsi_bus_flash_conn *fnode_conn;
3565 	struct device *dev;
3566 	uint32_t idx;
3567 	int err = 0;
3568 
3569 	if (!transport->login_flashnode) {
3570 		err = -ENOSYS;
3571 		goto exit_login_fnode;
3572 	}
3573 
3574 	shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3575 	if (!shost) {
3576 		pr_err("%s could not find host no %u\n",
3577 		       __func__, ev->u.login_flashnode.host_no);
3578 		err = -ENODEV;
3579 		goto put_host;
3580 	}
3581 
3582 	idx = ev->u.login_flashnode.flashnode_idx;
3583 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3584 	if (!fnode_sess) {
3585 		pr_err("%s could not find flashnode %u for host no %u\n",
3586 		       __func__, idx, ev->u.login_flashnode.host_no);
3587 		err = -ENODEV;
3588 		goto put_host;
3589 	}
3590 
3591 	dev = iscsi_find_flashnode_conn(fnode_sess);
3592 	if (!dev) {
3593 		err = -ENODEV;
3594 		goto put_sess;
3595 	}
3596 
3597 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3598 	err = transport->login_flashnode(fnode_sess, fnode_conn);
3599 	put_device(dev);
3600 
3601 put_sess:
3602 	put_device(&fnode_sess->dev);
3603 
3604 put_host:
3605 	scsi_host_put(shost);
3606 
3607 exit_login_fnode:
3608 	return err;
3609 }
3610 
iscsi_logout_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3611 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3612 				  struct iscsi_uevent *ev)
3613 {
3614 	struct Scsi_Host *shost;
3615 	struct iscsi_bus_flash_session *fnode_sess;
3616 	struct iscsi_bus_flash_conn *fnode_conn;
3617 	struct device *dev;
3618 	uint32_t idx;
3619 	int err = 0;
3620 
3621 	if (!transport->logout_flashnode) {
3622 		err = -ENOSYS;
3623 		goto exit_logout_fnode;
3624 	}
3625 
3626 	shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3627 	if (!shost) {
3628 		pr_err("%s could not find host no %u\n",
3629 		       __func__, ev->u.logout_flashnode.host_no);
3630 		err = -ENODEV;
3631 		goto put_host;
3632 	}
3633 
3634 	idx = ev->u.logout_flashnode.flashnode_idx;
3635 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3636 	if (!fnode_sess) {
3637 		pr_err("%s could not find flashnode %u for host no %u\n",
3638 		       __func__, idx, ev->u.logout_flashnode.host_no);
3639 		err = -ENODEV;
3640 		goto put_host;
3641 	}
3642 
3643 	dev = iscsi_find_flashnode_conn(fnode_sess);
3644 	if (!dev) {
3645 		err = -ENODEV;
3646 		goto put_sess;
3647 	}
3648 
3649 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3650 
3651 	err = transport->logout_flashnode(fnode_sess, fnode_conn);
3652 	put_device(dev);
3653 
3654 put_sess:
3655 	put_device(&fnode_sess->dev);
3656 
3657 put_host:
3658 	scsi_host_put(shost);
3659 
3660 exit_logout_fnode:
3661 	return err;
3662 }
3663 
iscsi_logout_flashnode_sid(struct iscsi_transport * transport,struct iscsi_uevent * ev)3664 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3665 				      struct iscsi_uevent *ev)
3666 {
3667 	struct Scsi_Host *shost;
3668 	struct iscsi_cls_session *session;
3669 	int err = 0;
3670 
3671 	if (!transport->logout_flashnode_sid) {
3672 		err = -ENOSYS;
3673 		goto exit_logout_sid;
3674 	}
3675 
3676 	shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3677 	if (!shost) {
3678 		pr_err("%s could not find host no %u\n",
3679 		       __func__, ev->u.logout_flashnode.host_no);
3680 		err = -ENODEV;
3681 		goto put_host;
3682 	}
3683 
3684 	session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3685 	if (!session) {
3686 		pr_err("%s could not find session id %u\n",
3687 		       __func__, ev->u.logout_flashnode_sid.sid);
3688 		err = -EINVAL;
3689 		goto put_host;
3690 	}
3691 
3692 	err = transport->logout_flashnode_sid(session);
3693 
3694 put_host:
3695 	scsi_host_put(shost);
3696 
3697 exit_logout_sid:
3698 	return err;
3699 }
3700 
3701 static int
iscsi_get_host_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)3702 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3703 {
3704 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3705 	struct Scsi_Host *shost = NULL;
3706 	struct iscsi_internal *priv;
3707 	struct sk_buff *skbhost_stats;
3708 	struct nlmsghdr *nlhhost_stats;
3709 	struct iscsi_uevent *evhost_stats;
3710 	int host_stats_size = 0;
3711 	int len, err = 0;
3712 	char *buf;
3713 
3714 	if (!transport->get_host_stats)
3715 		return -ENOSYS;
3716 
3717 	priv = iscsi_if_transport_lookup(transport);
3718 	if (!priv)
3719 		return -EINVAL;
3720 
3721 	host_stats_size = sizeof(struct iscsi_offload_host_stats);
3722 	len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3723 
3724 	shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3725 	if (!shost) {
3726 		pr_err("%s: failed. Could not find host no %u\n",
3727 		       __func__, ev->u.get_host_stats.host_no);
3728 		return -ENODEV;
3729 	}
3730 
3731 	do {
3732 		int actual_size;
3733 
3734 		skbhost_stats = alloc_skb(len, GFP_KERNEL);
3735 		if (!skbhost_stats) {
3736 			pr_err("cannot deliver host stats: OOM\n");
3737 			err = -ENOMEM;
3738 			goto exit_host_stats;
3739 		}
3740 
3741 		nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3742 				      (len - sizeof(*nlhhost_stats)), 0);
3743 		evhost_stats = nlmsg_data(nlhhost_stats);
3744 		memset(evhost_stats, 0, sizeof(*evhost_stats));
3745 		evhost_stats->transport_handle = iscsi_handle(transport);
3746 		evhost_stats->type = nlh->nlmsg_type;
3747 		evhost_stats->u.get_host_stats.host_no =
3748 					ev->u.get_host_stats.host_no;
3749 		buf = (char *)evhost_stats + sizeof(*evhost_stats);
3750 		memset(buf, 0, host_stats_size);
3751 
3752 		err = transport->get_host_stats(shost, buf, host_stats_size);
3753 		if (err) {
3754 			kfree_skb(skbhost_stats);
3755 			goto exit_host_stats;
3756 		}
3757 
3758 		actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3759 		skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3760 		nlhhost_stats->nlmsg_len = actual_size;
3761 
3762 		err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3763 					  GFP_KERNEL);
3764 	} while (err < 0 && err != -ECONNREFUSED);
3765 
3766 exit_host_stats:
3767 	scsi_host_put(shost);
3768 	return err;
3769 }
3770 
iscsi_if_transport_conn(struct iscsi_transport * transport,struct nlmsghdr * nlh)3771 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3772 				   struct nlmsghdr *nlh)
3773 {
3774 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3775 	struct iscsi_cls_session *session;
3776 	struct iscsi_cls_conn *conn = NULL;
3777 	struct iscsi_endpoint *ep;
3778 	uint32_t pdu_len;
3779 	int err = 0;
3780 
3781 	switch (nlh->nlmsg_type) {
3782 	case ISCSI_UEVENT_CREATE_CONN:
3783 		return iscsi_if_create_conn(transport, ev);
3784 	case ISCSI_UEVENT_DESTROY_CONN:
3785 		return iscsi_if_destroy_conn(transport, ev);
3786 	case ISCSI_UEVENT_STOP_CONN:
3787 		conn = iscsi_conn_lookup(ev->u.stop_conn.sid,
3788 					 ev->u.stop_conn.cid);
3789 		if (!conn)
3790 			return -EINVAL;
3791 
3792 		return iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3793 	}
3794 
3795 	/*
3796 	 * The following cmds need to be run under the ep_mutex so in kernel
3797 	 * conn cleanup (ep_disconnect + unbind and conn) is not done while
3798 	 * these are running. They also must not run if we have just run a conn
3799 	 * cleanup because they would set the state in a way that might allow
3800 	 * IO or send IO themselves.
3801 	 */
3802 	switch (nlh->nlmsg_type) {
3803 	case ISCSI_UEVENT_START_CONN:
3804 		conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3805 					 ev->u.start_conn.cid);
3806 		break;
3807 	case ISCSI_UEVENT_BIND_CONN:
3808 		conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3809 		break;
3810 	case ISCSI_UEVENT_SEND_PDU:
3811 		conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3812 		break;
3813 	}
3814 
3815 	if (!conn)
3816 		return -EINVAL;
3817 
3818 	mutex_lock(&conn->ep_mutex);
3819 	spin_lock_irq(&conn->lock);
3820 	if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3821 		spin_unlock_irq(&conn->lock);
3822 		mutex_unlock(&conn->ep_mutex);
3823 		ev->r.retcode = -ENOTCONN;
3824 		return 0;
3825 	}
3826 	spin_unlock_irq(&conn->lock);
3827 
3828 	switch (nlh->nlmsg_type) {
3829 	case ISCSI_UEVENT_BIND_CONN:
3830 		session = iscsi_session_lookup(ev->u.b_conn.sid);
3831 		if (!session) {
3832 			err = -EINVAL;
3833 			break;
3834 		}
3835 
3836 		ev->r.retcode =	transport->bind_conn(session, conn,
3837 						ev->u.b_conn.transport_eph,
3838 						ev->u.b_conn.is_leading);
3839 		if (!ev->r.retcode)
3840 			WRITE_ONCE(conn->state, ISCSI_CONN_BOUND);
3841 
3842 		if (ev->r.retcode || !transport->ep_connect)
3843 			break;
3844 
3845 		ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3846 		if (ep) {
3847 			ep->conn = conn;
3848 			conn->ep = ep;
3849 			iscsi_put_endpoint(ep);
3850 		} else {
3851 			err = -ENOTCONN;
3852 			iscsi_cls_conn_printk(KERN_ERR, conn,
3853 					      "Could not set ep conn binding\n");
3854 		}
3855 		break;
3856 	case ISCSI_UEVENT_START_CONN:
3857 		ev->r.retcode = transport->start_conn(conn);
3858 		if (!ev->r.retcode)
3859 			WRITE_ONCE(conn->state, ISCSI_CONN_UP);
3860 
3861 		break;
3862 	case ISCSI_UEVENT_SEND_PDU:
3863 		pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3864 
3865 		if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3866 		    (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3867 			err = -EINVAL;
3868 			break;
3869 		}
3870 
3871 		ev->r.retcode =	transport->send_pdu(conn,
3872 				(struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3873 				(char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3874 				ev->u.send_pdu.data_size);
3875 		break;
3876 	default:
3877 		err = -ENOSYS;
3878 	}
3879 
3880 	mutex_unlock(&conn->ep_mutex);
3881 	return err;
3882 }
3883 
3884 static int
iscsi_if_recv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,uint32_t * group)3885 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3886 {
3887 	int err = 0;
3888 	u32 portid;
3889 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3890 	struct iscsi_transport *transport = NULL;
3891 	struct iscsi_internal *priv;
3892 	struct iscsi_cls_session *session;
3893 	struct iscsi_endpoint *ep = NULL;
3894 
3895 	if (!netlink_capable(skb, CAP_SYS_ADMIN))
3896 		return -EPERM;
3897 
3898 	if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3899 		*group = ISCSI_NL_GRP_UIP;
3900 	else
3901 		*group = ISCSI_NL_GRP_ISCSID;
3902 
3903 	priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3904 	if (!priv)
3905 		return -EINVAL;
3906 	transport = priv->iscsi_transport;
3907 
3908 	if (!try_module_get(transport->owner))
3909 		return -EINVAL;
3910 
3911 	portid = NETLINK_CB(skb).portid;
3912 
3913 	switch (nlh->nlmsg_type) {
3914 	case ISCSI_UEVENT_CREATE_SESSION:
3915 		err = iscsi_if_create_session(priv, ep, ev,
3916 					      portid,
3917 					      ev->u.c_session.initial_cmdsn,
3918 					      ev->u.c_session.cmds_max,
3919 					      ev->u.c_session.queue_depth);
3920 		break;
3921 	case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3922 		ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3923 		if (!ep) {
3924 			err = -EINVAL;
3925 			break;
3926 		}
3927 
3928 		err = iscsi_if_create_session(priv, ep, ev,
3929 					portid,
3930 					ev->u.c_bound_session.initial_cmdsn,
3931 					ev->u.c_bound_session.cmds_max,
3932 					ev->u.c_bound_session.queue_depth);
3933 		iscsi_put_endpoint(ep);
3934 		break;
3935 	case ISCSI_UEVENT_DESTROY_SESSION:
3936 		session = iscsi_session_lookup(ev->u.d_session.sid);
3937 		if (!session)
3938 			err = -EINVAL;
3939 		else if (iscsi_session_has_conns(ev->u.d_session.sid))
3940 			err = -EBUSY;
3941 		else
3942 			transport->destroy_session(session);
3943 		break;
3944 	case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3945 		session = iscsi_session_lookup(ev->u.d_session.sid);
3946 		if (!session)
3947 			err = -EINVAL;
3948 		else if (iscsi_session_has_conns(ev->u.d_session.sid))
3949 			err = -EBUSY;
3950 		else {
3951 			unsigned long flags;
3952 
3953 			/* Prevent this session from being found again */
3954 			spin_lock_irqsave(&sesslock, flags);
3955 			list_del_init(&session->sess_list);
3956 			spin_unlock_irqrestore(&sesslock, flags);
3957 
3958 			queue_work(system_unbound_wq, &session->destroy_work);
3959 		}
3960 		break;
3961 	case ISCSI_UEVENT_UNBIND_SESSION:
3962 		session = iscsi_session_lookup(ev->u.d_session.sid);
3963 		if (session)
3964 			queue_work(session->workq, &session->unbind_work);
3965 		else
3966 			err = -EINVAL;
3967 		break;
3968 	case ISCSI_UEVENT_SET_PARAM:
3969 		err = iscsi_set_param(transport, ev);
3970 		break;
3971 	case ISCSI_UEVENT_CREATE_CONN:
3972 	case ISCSI_UEVENT_DESTROY_CONN:
3973 	case ISCSI_UEVENT_STOP_CONN:
3974 	case ISCSI_UEVENT_START_CONN:
3975 	case ISCSI_UEVENT_BIND_CONN:
3976 	case ISCSI_UEVENT_SEND_PDU:
3977 		err = iscsi_if_transport_conn(transport, nlh);
3978 		break;
3979 	case ISCSI_UEVENT_GET_STATS:
3980 		err = iscsi_if_get_stats(transport, nlh);
3981 		break;
3982 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3983 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3984 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3985 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3986 		err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3987 		break;
3988 	case ISCSI_UEVENT_TGT_DSCVR:
3989 		err = iscsi_tgt_dscvr(transport, ev);
3990 		break;
3991 	case ISCSI_UEVENT_SET_HOST_PARAM:
3992 		err = iscsi_set_host_param(transport, ev);
3993 		break;
3994 	case ISCSI_UEVENT_PATH_UPDATE:
3995 		err = iscsi_set_path(transport, ev);
3996 		break;
3997 	case ISCSI_UEVENT_SET_IFACE_PARAMS:
3998 		err = iscsi_set_iface_params(transport, ev,
3999 					     nlmsg_attrlen(nlh, sizeof(*ev)));
4000 		break;
4001 	case ISCSI_UEVENT_PING:
4002 		err = iscsi_send_ping(transport, ev);
4003 		break;
4004 	case ISCSI_UEVENT_GET_CHAP:
4005 		err = iscsi_get_chap(transport, nlh);
4006 		break;
4007 	case ISCSI_UEVENT_DELETE_CHAP:
4008 		err = iscsi_delete_chap(transport, ev);
4009 		break;
4010 	case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
4011 		err = iscsi_set_flashnode_param(transport, ev,
4012 						nlmsg_attrlen(nlh,
4013 							      sizeof(*ev)));
4014 		break;
4015 	case ISCSI_UEVENT_NEW_FLASHNODE:
4016 		err = iscsi_new_flashnode(transport, ev,
4017 					  nlmsg_attrlen(nlh, sizeof(*ev)));
4018 		break;
4019 	case ISCSI_UEVENT_DEL_FLASHNODE:
4020 		err = iscsi_del_flashnode(transport, ev);
4021 		break;
4022 	case ISCSI_UEVENT_LOGIN_FLASHNODE:
4023 		err = iscsi_login_flashnode(transport, ev);
4024 		break;
4025 	case ISCSI_UEVENT_LOGOUT_FLASHNODE:
4026 		err = iscsi_logout_flashnode(transport, ev);
4027 		break;
4028 	case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
4029 		err = iscsi_logout_flashnode_sid(transport, ev);
4030 		break;
4031 	case ISCSI_UEVENT_SET_CHAP:
4032 		err = iscsi_set_chap(transport, ev,
4033 				     nlmsg_attrlen(nlh, sizeof(*ev)));
4034 		break;
4035 	case ISCSI_UEVENT_GET_HOST_STATS:
4036 		err = iscsi_get_host_stats(transport, nlh);
4037 		break;
4038 	default:
4039 		err = -ENOSYS;
4040 		break;
4041 	}
4042 
4043 	module_put(transport->owner);
4044 	return err;
4045 }
4046 
4047 /*
4048  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
4049  * Malformed skbs with wrong lengths or invalid creds are not processed.
4050  */
4051 static void
iscsi_if_rx(struct sk_buff * skb)4052 iscsi_if_rx(struct sk_buff *skb)
4053 {
4054 	u32 portid = NETLINK_CB(skb).portid;
4055 
4056 	mutex_lock(&rx_queue_mutex);
4057 	while (skb->len >= NLMSG_HDRLEN) {
4058 		int err;
4059 		uint32_t rlen;
4060 		struct nlmsghdr	*nlh;
4061 		struct iscsi_uevent *ev;
4062 		uint32_t group;
4063 		int retries = ISCSI_SEND_MAX_ALLOWED;
4064 
4065 		nlh = nlmsg_hdr(skb);
4066 		if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
4067 		    skb->len < nlh->nlmsg_len) {
4068 			break;
4069 		}
4070 
4071 		ev = nlmsg_data(nlh);
4072 		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4073 		if (rlen > skb->len)
4074 			rlen = skb->len;
4075 
4076 		err = iscsi_if_recv_msg(skb, nlh, &group);
4077 		if (err) {
4078 			ev->type = ISCSI_KEVENT_IF_ERROR;
4079 			ev->iferror = err;
4080 		}
4081 		do {
4082 			/*
4083 			 * special case for GET_STATS:
4084 			 * on success - sending reply and stats from
4085 			 * inside of if_recv_msg(),
4086 			 * on error - fall through.
4087 			 */
4088 			if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4089 				break;
4090 			if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4091 				break;
4092 			err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4093 						  ev, sizeof(*ev));
4094 			if (err == -EAGAIN && --retries < 0) {
4095 				printk(KERN_WARNING "Send reply failed, error %d\n", err);
4096 				break;
4097 			}
4098 		} while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4099 		skb_pull(skb, rlen);
4100 	}
4101 	mutex_unlock(&rx_queue_mutex);
4102 }
4103 
4104 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)		\
4105 struct device_attribute dev_attr_##_prefix##_##_name =	\
4106 	__ATTR(_name,_mode,_show,_store)
4107 
4108 /*
4109  * iSCSI connection attrs
4110  */
4111 #define iscsi_conn_attr_show(param)					\
4112 static ssize_t								\
4113 show_conn_param_##param(struct device *dev, 				\
4114 			struct device_attribute *attr, char *buf)	\
4115 {									\
4116 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
4117 	struct iscsi_transport *t = conn->transport;			\
4118 	return t->get_conn_param(conn, param, buf);			\
4119 }
4120 
4121 #define iscsi_conn_attr(field, param)					\
4122 	iscsi_conn_attr_show(param)					\
4123 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,	\
4124 			NULL);
4125 
4126 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4127 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4128 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4129 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4130 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4131 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4132 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4133 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4134 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4135 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4136 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4137 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4138 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4139 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4140 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4141 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4142 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4143 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4144 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4145 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4146 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4147 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4148 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4149 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4150 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4151 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4152 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4153 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4154 
4155 static const char *const connection_state_names[] = {
4156 	[ISCSI_CONN_UP] = "up",
4157 	[ISCSI_CONN_DOWN] = "down",
4158 	[ISCSI_CONN_FAILED] = "failed",
4159 	[ISCSI_CONN_BOUND] = "bound"
4160 };
4161 
show_conn_state(struct device * dev,struct device_attribute * attr,char * buf)4162 static ssize_t show_conn_state(struct device *dev,
4163 			       struct device_attribute *attr, char *buf)
4164 {
4165 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4166 	const char *state = "unknown";
4167 	int conn_state = READ_ONCE(conn->state);
4168 
4169 	if (conn_state >= 0 &&
4170 	    conn_state < ARRAY_SIZE(connection_state_names))
4171 		state = connection_state_names[conn_state];
4172 
4173 	return sysfs_emit(buf, "%s\n", state);
4174 }
4175 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4176 			NULL);
4177 
4178 #define iscsi_conn_ep_attr_show(param)					\
4179 static ssize_t show_conn_ep_param_##param(struct device *dev,		\
4180 					  struct device_attribute *attr,\
4181 					  char *buf)			\
4182 {									\
4183 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
4184 	struct iscsi_transport *t = conn->transport;			\
4185 	struct iscsi_endpoint *ep;					\
4186 	ssize_t rc;							\
4187 									\
4188 	/*								\
4189 	 * Need to make sure ep_disconnect does not free the LLD's	\
4190 	 * interconnect resources while we are trying to read them.	\
4191 	 */								\
4192 	mutex_lock(&conn->ep_mutex);					\
4193 	ep = conn->ep;							\
4194 	if (!ep && t->ep_connect) {					\
4195 		mutex_unlock(&conn->ep_mutex);				\
4196 		return -ENOTCONN;					\
4197 	}								\
4198 									\
4199 	if (ep)								\
4200 		rc = t->get_ep_param(ep, param, buf);			\
4201 	else								\
4202 		rc = t->get_conn_param(conn, param, buf);		\
4203 	mutex_unlock(&conn->ep_mutex);					\
4204 	return rc;							\
4205 }
4206 
4207 #define iscsi_conn_ep_attr(field, param)				\
4208 	iscsi_conn_ep_attr_show(param)					\
4209 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,				\
4210 			show_conn_ep_param_##param, NULL);
4211 
4212 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4213 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4214 
4215 static struct attribute *iscsi_conn_attrs[] = {
4216 	&dev_attr_conn_max_recv_dlength.attr,
4217 	&dev_attr_conn_max_xmit_dlength.attr,
4218 	&dev_attr_conn_header_digest.attr,
4219 	&dev_attr_conn_data_digest.attr,
4220 	&dev_attr_conn_ifmarker.attr,
4221 	&dev_attr_conn_ofmarker.attr,
4222 	&dev_attr_conn_address.attr,
4223 	&dev_attr_conn_port.attr,
4224 	&dev_attr_conn_exp_statsn.attr,
4225 	&dev_attr_conn_persistent_address.attr,
4226 	&dev_attr_conn_persistent_port.attr,
4227 	&dev_attr_conn_ping_tmo.attr,
4228 	&dev_attr_conn_recv_tmo.attr,
4229 	&dev_attr_conn_local_port.attr,
4230 	&dev_attr_conn_statsn.attr,
4231 	&dev_attr_conn_keepalive_tmo.attr,
4232 	&dev_attr_conn_max_segment_size.attr,
4233 	&dev_attr_conn_tcp_timestamp_stat.attr,
4234 	&dev_attr_conn_tcp_wsf_disable.attr,
4235 	&dev_attr_conn_tcp_nagle_disable.attr,
4236 	&dev_attr_conn_tcp_timer_scale.attr,
4237 	&dev_attr_conn_tcp_timestamp_enable.attr,
4238 	&dev_attr_conn_fragment_disable.attr,
4239 	&dev_attr_conn_ipv4_tos.attr,
4240 	&dev_attr_conn_ipv6_traffic_class.attr,
4241 	&dev_attr_conn_ipv6_flow_label.attr,
4242 	&dev_attr_conn_is_fw_assigned_ipv6.attr,
4243 	&dev_attr_conn_tcp_xmit_wsf.attr,
4244 	&dev_attr_conn_tcp_recv_wsf.attr,
4245 	&dev_attr_conn_local_ipaddr.attr,
4246 	&dev_attr_conn_state.attr,
4247 	NULL,
4248 };
4249 
iscsi_conn_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4250 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4251 					 struct attribute *attr, int i)
4252 {
4253 	struct device *cdev = container_of(kobj, struct device, kobj);
4254 	struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4255 	struct iscsi_transport *t = conn->transport;
4256 	int param;
4257 
4258 	if (attr == &dev_attr_conn_max_recv_dlength.attr)
4259 		param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4260 	else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4261 		param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4262 	else if (attr == &dev_attr_conn_header_digest.attr)
4263 		param = ISCSI_PARAM_HDRDGST_EN;
4264 	else if (attr == &dev_attr_conn_data_digest.attr)
4265 		param = ISCSI_PARAM_DATADGST_EN;
4266 	else if (attr == &dev_attr_conn_ifmarker.attr)
4267 		param = ISCSI_PARAM_IFMARKER_EN;
4268 	else if (attr == &dev_attr_conn_ofmarker.attr)
4269 		param = ISCSI_PARAM_OFMARKER_EN;
4270 	else if (attr == &dev_attr_conn_address.attr)
4271 		param = ISCSI_PARAM_CONN_ADDRESS;
4272 	else if (attr == &dev_attr_conn_port.attr)
4273 		param = ISCSI_PARAM_CONN_PORT;
4274 	else if (attr == &dev_attr_conn_exp_statsn.attr)
4275 		param = ISCSI_PARAM_EXP_STATSN;
4276 	else if (attr == &dev_attr_conn_persistent_address.attr)
4277 		param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4278 	else if (attr == &dev_attr_conn_persistent_port.attr)
4279 		param = ISCSI_PARAM_PERSISTENT_PORT;
4280 	else if (attr == &dev_attr_conn_ping_tmo.attr)
4281 		param = ISCSI_PARAM_PING_TMO;
4282 	else if (attr == &dev_attr_conn_recv_tmo.attr)
4283 		param = ISCSI_PARAM_RECV_TMO;
4284 	else if (attr == &dev_attr_conn_local_port.attr)
4285 		param = ISCSI_PARAM_LOCAL_PORT;
4286 	else if (attr == &dev_attr_conn_statsn.attr)
4287 		param = ISCSI_PARAM_STATSN;
4288 	else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4289 		param = ISCSI_PARAM_KEEPALIVE_TMO;
4290 	else if (attr == &dev_attr_conn_max_segment_size.attr)
4291 		param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4292 	else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4293 		param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4294 	else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4295 		param = ISCSI_PARAM_TCP_WSF_DISABLE;
4296 	else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4297 		param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4298 	else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4299 		param = ISCSI_PARAM_TCP_TIMER_SCALE;
4300 	else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4301 		param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4302 	else if (attr == &dev_attr_conn_fragment_disable.attr)
4303 		param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4304 	else if (attr == &dev_attr_conn_ipv4_tos.attr)
4305 		param = ISCSI_PARAM_IPV4_TOS;
4306 	else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4307 		param = ISCSI_PARAM_IPV6_TC;
4308 	else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4309 		param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4310 	else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4311 		param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4312 	else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4313 		param = ISCSI_PARAM_TCP_XMIT_WSF;
4314 	else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4315 		param = ISCSI_PARAM_TCP_RECV_WSF;
4316 	else if (attr == &dev_attr_conn_local_ipaddr.attr)
4317 		param = ISCSI_PARAM_LOCAL_IPADDR;
4318 	else if (attr == &dev_attr_conn_state.attr)
4319 		return S_IRUGO;
4320 	else {
4321 		WARN_ONCE(1, "Invalid conn attr");
4322 		return 0;
4323 	}
4324 
4325 	return t->attr_is_visible(ISCSI_PARAM, param);
4326 }
4327 
4328 static struct attribute_group iscsi_conn_group = {
4329 	.attrs = iscsi_conn_attrs,
4330 	.is_visible = iscsi_conn_attr_is_visible,
4331 };
4332 
4333 /*
4334  * iSCSI session attrs
4335  */
4336 #define iscsi_session_attr_show(param, perm)				\
4337 static ssize_t								\
4338 show_session_param_##param(struct device *dev,				\
4339 			   struct device_attribute *attr, char *buf)	\
4340 {									\
4341 	struct iscsi_cls_session *session = 				\
4342 		iscsi_dev_to_session(dev->parent);			\
4343 	struct iscsi_transport *t = session->transport;			\
4344 									\
4345 	if (perm && !capable(CAP_SYS_ADMIN))				\
4346 		return -EACCES;						\
4347 	return t->get_session_param(session, param, buf);		\
4348 }
4349 
4350 #define iscsi_session_attr(field, param, perm)				\
4351 	iscsi_session_attr_show(param, perm)				\
4352 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4353 			NULL);
4354 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4355 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4356 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4357 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4358 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4359 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4360 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4361 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4362 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4363 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4364 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4365 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4366 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4367 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4368 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4369 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4370 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4371 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4372 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4373 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4374 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4375 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4376 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4377 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4378 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4379 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4380 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4381 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4382 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4383 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4384 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4385 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4386 iscsi_session_attr(discovery_auth_optional,
4387 		   ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4388 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4389 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4390 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4391 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4392 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4393 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4394 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4395 
4396 static ssize_t
show_priv_session_target_state(struct device * dev,struct device_attribute * attr,char * buf)4397 show_priv_session_target_state(struct device *dev, struct device_attribute *attr,
4398 			char *buf)
4399 {
4400 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4401 
4402 	return sysfs_emit(buf, "%s\n",
4403 			iscsi_session_target_state_name[session->target_state]);
4404 }
4405 
4406 static ISCSI_CLASS_ATTR(priv_sess, target_state, S_IRUGO,
4407 			show_priv_session_target_state, NULL);
4408 
4409 static ssize_t
show_priv_session_state(struct device * dev,struct device_attribute * attr,char * buf)4410 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4411 			char *buf)
4412 {
4413 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4414 	return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4415 }
4416 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4417 			NULL);
4418 static ssize_t
show_priv_session_creator(struct device * dev,struct device_attribute * attr,char * buf)4419 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4420 			char *buf)
4421 {
4422 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4423 	return sysfs_emit(buf, "%d\n", session->creator);
4424 }
4425 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4426 			NULL);
4427 static ssize_t
show_priv_session_target_id(struct device * dev,struct device_attribute * attr,char * buf)4428 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4429 			    char *buf)
4430 {
4431 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4432 	return sysfs_emit(buf, "%d\n", session->target_id);
4433 }
4434 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4435 			show_priv_session_target_id, NULL);
4436 
4437 #define iscsi_priv_session_attr_show(field, format)			\
4438 static ssize_t								\
4439 show_priv_session_##field(struct device *dev, 				\
4440 			  struct device_attribute *attr, char *buf)	\
4441 {									\
4442 	struct iscsi_cls_session *session = 				\
4443 			iscsi_dev_to_session(dev->parent);		\
4444 	if (session->field == -1)					\
4445 		return sysfs_emit(buf, "off\n");			\
4446 	return sysfs_emit(buf, format"\n", session->field);		\
4447 }
4448 
4449 #define iscsi_priv_session_attr_store(field)				\
4450 static ssize_t								\
4451 store_priv_session_##field(struct device *dev,				\
4452 			   struct device_attribute *attr,		\
4453 			   const char *buf, size_t count)		\
4454 {									\
4455 	int val;							\
4456 	char *cp;							\
4457 	struct iscsi_cls_session *session =				\
4458 		iscsi_dev_to_session(dev->parent);			\
4459 	if ((session->state == ISCSI_SESSION_FREE) ||			\
4460 	    (session->state == ISCSI_SESSION_FAILED))			\
4461 		return -EBUSY;						\
4462 	if (strncmp(buf, "off", 3) == 0) {				\
4463 		session->field = -1;					\
4464 		session->field##_sysfs_override = true;			\
4465 	} else {							\
4466 		val = simple_strtoul(buf, &cp, 0);			\
4467 		if (*cp != '\0' && *cp != '\n')				\
4468 			return -EINVAL;					\
4469 		session->field = val;					\
4470 		session->field##_sysfs_override = true;			\
4471 	}								\
4472 	return count;							\
4473 }
4474 
4475 #define iscsi_priv_session_rw_attr(field, format)			\
4476 	iscsi_priv_session_attr_show(field, format)			\
4477 	iscsi_priv_session_attr_store(field)				\
4478 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,		\
4479 			show_priv_session_##field,			\
4480 			store_priv_session_##field)
4481 
4482 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4483 
4484 static struct attribute *iscsi_session_attrs[] = {
4485 	&dev_attr_sess_initial_r2t.attr,
4486 	&dev_attr_sess_max_outstanding_r2t.attr,
4487 	&dev_attr_sess_immediate_data.attr,
4488 	&dev_attr_sess_first_burst_len.attr,
4489 	&dev_attr_sess_max_burst_len.attr,
4490 	&dev_attr_sess_data_pdu_in_order.attr,
4491 	&dev_attr_sess_data_seq_in_order.attr,
4492 	&dev_attr_sess_erl.attr,
4493 	&dev_attr_sess_targetname.attr,
4494 	&dev_attr_sess_tpgt.attr,
4495 	&dev_attr_sess_password.attr,
4496 	&dev_attr_sess_password_in.attr,
4497 	&dev_attr_sess_username.attr,
4498 	&dev_attr_sess_username_in.attr,
4499 	&dev_attr_sess_fast_abort.attr,
4500 	&dev_attr_sess_abort_tmo.attr,
4501 	&dev_attr_sess_lu_reset_tmo.attr,
4502 	&dev_attr_sess_tgt_reset_tmo.attr,
4503 	&dev_attr_sess_ifacename.attr,
4504 	&dev_attr_sess_initiatorname.attr,
4505 	&dev_attr_sess_targetalias.attr,
4506 	&dev_attr_sess_boot_root.attr,
4507 	&dev_attr_sess_boot_nic.attr,
4508 	&dev_attr_sess_boot_target.attr,
4509 	&dev_attr_priv_sess_recovery_tmo.attr,
4510 	&dev_attr_priv_sess_state.attr,
4511 	&dev_attr_priv_sess_target_state.attr,
4512 	&dev_attr_priv_sess_creator.attr,
4513 	&dev_attr_sess_chap_out_idx.attr,
4514 	&dev_attr_sess_chap_in_idx.attr,
4515 	&dev_attr_priv_sess_target_id.attr,
4516 	&dev_attr_sess_auto_snd_tgt_disable.attr,
4517 	&dev_attr_sess_discovery_session.attr,
4518 	&dev_attr_sess_portal_type.attr,
4519 	&dev_attr_sess_chap_auth.attr,
4520 	&dev_attr_sess_discovery_logout.attr,
4521 	&dev_attr_sess_bidi_chap.attr,
4522 	&dev_attr_sess_discovery_auth_optional.attr,
4523 	&dev_attr_sess_def_time2wait.attr,
4524 	&dev_attr_sess_def_time2retain.attr,
4525 	&dev_attr_sess_isid.attr,
4526 	&dev_attr_sess_tsid.attr,
4527 	&dev_attr_sess_def_taskmgmt_tmo.attr,
4528 	&dev_attr_sess_discovery_parent_idx.attr,
4529 	&dev_attr_sess_discovery_parent_type.attr,
4530 	NULL,
4531 };
4532 
iscsi_session_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4533 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4534 					    struct attribute *attr, int i)
4535 {
4536 	struct device *cdev = container_of(kobj, struct device, kobj);
4537 	struct iscsi_cls_session *session = transport_class_to_session(cdev);
4538 	struct iscsi_transport *t = session->transport;
4539 	int param;
4540 
4541 	if (attr == &dev_attr_sess_initial_r2t.attr)
4542 		param = ISCSI_PARAM_INITIAL_R2T_EN;
4543 	else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4544 		param = ISCSI_PARAM_MAX_R2T;
4545 	else if (attr == &dev_attr_sess_immediate_data.attr)
4546 		param = ISCSI_PARAM_IMM_DATA_EN;
4547 	else if (attr == &dev_attr_sess_first_burst_len.attr)
4548 		param = ISCSI_PARAM_FIRST_BURST;
4549 	else if (attr == &dev_attr_sess_max_burst_len.attr)
4550 		param = ISCSI_PARAM_MAX_BURST;
4551 	else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4552 		param = ISCSI_PARAM_PDU_INORDER_EN;
4553 	else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4554 		param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4555 	else if (attr == &dev_attr_sess_erl.attr)
4556 		param = ISCSI_PARAM_ERL;
4557 	else if (attr == &dev_attr_sess_targetname.attr)
4558 		param = ISCSI_PARAM_TARGET_NAME;
4559 	else if (attr == &dev_attr_sess_tpgt.attr)
4560 		param = ISCSI_PARAM_TPGT;
4561 	else if (attr == &dev_attr_sess_chap_in_idx.attr)
4562 		param = ISCSI_PARAM_CHAP_IN_IDX;
4563 	else if (attr == &dev_attr_sess_chap_out_idx.attr)
4564 		param = ISCSI_PARAM_CHAP_OUT_IDX;
4565 	else if (attr == &dev_attr_sess_password.attr)
4566 		param = ISCSI_PARAM_USERNAME;
4567 	else if (attr == &dev_attr_sess_password_in.attr)
4568 		param = ISCSI_PARAM_USERNAME_IN;
4569 	else if (attr == &dev_attr_sess_username.attr)
4570 		param = ISCSI_PARAM_PASSWORD;
4571 	else if (attr == &dev_attr_sess_username_in.attr)
4572 		param = ISCSI_PARAM_PASSWORD_IN;
4573 	else if (attr == &dev_attr_sess_fast_abort.attr)
4574 		param = ISCSI_PARAM_FAST_ABORT;
4575 	else if (attr == &dev_attr_sess_abort_tmo.attr)
4576 		param = ISCSI_PARAM_ABORT_TMO;
4577 	else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4578 		param = ISCSI_PARAM_LU_RESET_TMO;
4579 	else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4580 		param = ISCSI_PARAM_TGT_RESET_TMO;
4581 	else if (attr == &dev_attr_sess_ifacename.attr)
4582 		param = ISCSI_PARAM_IFACE_NAME;
4583 	else if (attr == &dev_attr_sess_initiatorname.attr)
4584 		param = ISCSI_PARAM_INITIATOR_NAME;
4585 	else if (attr == &dev_attr_sess_targetalias.attr)
4586 		param = ISCSI_PARAM_TARGET_ALIAS;
4587 	else if (attr == &dev_attr_sess_boot_root.attr)
4588 		param = ISCSI_PARAM_BOOT_ROOT;
4589 	else if (attr == &dev_attr_sess_boot_nic.attr)
4590 		param = ISCSI_PARAM_BOOT_NIC;
4591 	else if (attr == &dev_attr_sess_boot_target.attr)
4592 		param = ISCSI_PARAM_BOOT_TARGET;
4593 	else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4594 		param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4595 	else if (attr == &dev_attr_sess_discovery_session.attr)
4596 		param = ISCSI_PARAM_DISCOVERY_SESS;
4597 	else if (attr == &dev_attr_sess_portal_type.attr)
4598 		param = ISCSI_PARAM_PORTAL_TYPE;
4599 	else if (attr == &dev_attr_sess_chap_auth.attr)
4600 		param = ISCSI_PARAM_CHAP_AUTH_EN;
4601 	else if (attr == &dev_attr_sess_discovery_logout.attr)
4602 		param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4603 	else if (attr == &dev_attr_sess_bidi_chap.attr)
4604 		param = ISCSI_PARAM_BIDI_CHAP_EN;
4605 	else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4606 		param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4607 	else if (attr == &dev_attr_sess_def_time2wait.attr)
4608 		param = ISCSI_PARAM_DEF_TIME2WAIT;
4609 	else if (attr == &dev_attr_sess_def_time2retain.attr)
4610 		param = ISCSI_PARAM_DEF_TIME2RETAIN;
4611 	else if (attr == &dev_attr_sess_isid.attr)
4612 		param = ISCSI_PARAM_ISID;
4613 	else if (attr == &dev_attr_sess_tsid.attr)
4614 		param = ISCSI_PARAM_TSID;
4615 	else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4616 		param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4617 	else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4618 		param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4619 	else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4620 		param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4621 	else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4622 		return S_IRUGO | S_IWUSR;
4623 	else if (attr == &dev_attr_priv_sess_state.attr)
4624 		return S_IRUGO;
4625 	else if (attr == &dev_attr_priv_sess_target_state.attr)
4626 		return S_IRUGO;
4627 	else if (attr == &dev_attr_priv_sess_creator.attr)
4628 		return S_IRUGO;
4629 	else if (attr == &dev_attr_priv_sess_target_id.attr)
4630 		return S_IRUGO;
4631 	else {
4632 		WARN_ONCE(1, "Invalid session attr");
4633 		return 0;
4634 	}
4635 
4636 	return t->attr_is_visible(ISCSI_PARAM, param);
4637 }
4638 
4639 static struct attribute_group iscsi_session_group = {
4640 	.attrs = iscsi_session_attrs,
4641 	.is_visible = iscsi_session_attr_is_visible,
4642 };
4643 
4644 /*
4645  * iSCSI host attrs
4646  */
4647 #define iscsi_host_attr_show(param)					\
4648 static ssize_t								\
4649 show_host_param_##param(struct device *dev, 				\
4650 			struct device_attribute *attr, char *buf)	\
4651 {									\
4652 	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
4653 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4654 	return priv->iscsi_transport->get_host_param(shost, param, buf); \
4655 }
4656 
4657 #define iscsi_host_attr(field, param)					\
4658 	iscsi_host_attr_show(param)					\
4659 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,	\
4660 			NULL);
4661 
4662 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4663 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4664 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4665 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4666 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4667 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4668 
4669 static struct attribute *iscsi_host_attrs[] = {
4670 	&dev_attr_host_netdev.attr,
4671 	&dev_attr_host_hwaddress.attr,
4672 	&dev_attr_host_ipaddress.attr,
4673 	&dev_attr_host_initiatorname.attr,
4674 	&dev_attr_host_port_state.attr,
4675 	&dev_attr_host_port_speed.attr,
4676 	NULL,
4677 };
4678 
iscsi_host_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4679 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4680 					 struct attribute *attr, int i)
4681 {
4682 	struct device *cdev = container_of(kobj, struct device, kobj);
4683 	struct Scsi_Host *shost = transport_class_to_shost(cdev);
4684 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4685 	int param;
4686 
4687 	if (attr == &dev_attr_host_netdev.attr)
4688 		param = ISCSI_HOST_PARAM_NETDEV_NAME;
4689 	else if (attr == &dev_attr_host_hwaddress.attr)
4690 		param = ISCSI_HOST_PARAM_HWADDRESS;
4691 	else if (attr == &dev_attr_host_ipaddress.attr)
4692 		param = ISCSI_HOST_PARAM_IPADDRESS;
4693 	else if (attr == &dev_attr_host_initiatorname.attr)
4694 		param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4695 	else if (attr == &dev_attr_host_port_state.attr)
4696 		param = ISCSI_HOST_PARAM_PORT_STATE;
4697 	else if (attr == &dev_attr_host_port_speed.attr)
4698 		param = ISCSI_HOST_PARAM_PORT_SPEED;
4699 	else {
4700 		WARN_ONCE(1, "Invalid host attr");
4701 		return 0;
4702 	}
4703 
4704 	return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4705 }
4706 
4707 static struct attribute_group iscsi_host_group = {
4708 	.attrs = iscsi_host_attrs,
4709 	.is_visible = iscsi_host_attr_is_visible,
4710 };
4711 
4712 /* convert iscsi_port_speed values to ascii string name */
4713 static const struct {
4714 	enum iscsi_port_speed	value;
4715 	char			*name;
4716 } iscsi_port_speed_names[] = {
4717 	{ISCSI_PORT_SPEED_UNKNOWN,	"Unknown" },
4718 	{ISCSI_PORT_SPEED_10MBPS,	"10 Mbps" },
4719 	{ISCSI_PORT_SPEED_100MBPS,	"100 Mbps" },
4720 	{ISCSI_PORT_SPEED_1GBPS,	"1 Gbps" },
4721 	{ISCSI_PORT_SPEED_10GBPS,	"10 Gbps" },
4722 	{ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4723 	{ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4724 };
4725 
iscsi_get_port_speed_name(struct Scsi_Host * shost)4726 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4727 {
4728 	int i;
4729 	char *speed = "Unknown!";
4730 	struct iscsi_cls_host *ihost = shost->shost_data;
4731 	uint32_t port_speed = ihost->port_speed;
4732 
4733 	for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4734 		if (iscsi_port_speed_names[i].value & port_speed) {
4735 			speed = iscsi_port_speed_names[i].name;
4736 			break;
4737 		}
4738 	}
4739 	return speed;
4740 }
4741 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4742 
4743 /* convert iscsi_port_state values to ascii string name */
4744 static const struct {
4745 	enum iscsi_port_state	value;
4746 	char			*name;
4747 } iscsi_port_state_names[] = {
4748 	{ISCSI_PORT_STATE_DOWN,		"LINK DOWN" },
4749 	{ISCSI_PORT_STATE_UP,		"LINK UP" },
4750 };
4751 
iscsi_get_port_state_name(struct Scsi_Host * shost)4752 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4753 {
4754 	int i;
4755 	char *state = "Unknown!";
4756 	struct iscsi_cls_host *ihost = shost->shost_data;
4757 	uint32_t port_state = ihost->port_state;
4758 
4759 	for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4760 		if (iscsi_port_state_names[i].value & port_state) {
4761 			state = iscsi_port_state_names[i].name;
4762 			break;
4763 		}
4764 	}
4765 	return state;
4766 }
4767 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4768 
iscsi_session_match(struct attribute_container * cont,struct device * dev)4769 static int iscsi_session_match(struct attribute_container *cont,
4770 			   struct device *dev)
4771 {
4772 	struct iscsi_cls_session *session;
4773 	struct Scsi_Host *shost;
4774 	struct iscsi_internal *priv;
4775 
4776 	if (!iscsi_is_session_dev(dev))
4777 		return 0;
4778 
4779 	session = iscsi_dev_to_session(dev);
4780 	shost = iscsi_session_to_shost(session);
4781 	if (!shost->transportt)
4782 		return 0;
4783 
4784 	priv = to_iscsi_internal(shost->transportt);
4785 	if (priv->session_cont.ac.class != &iscsi_session_class.class)
4786 		return 0;
4787 
4788 	return &priv->session_cont.ac == cont;
4789 }
4790 
iscsi_conn_match(struct attribute_container * cont,struct device * dev)4791 static int iscsi_conn_match(struct attribute_container *cont,
4792 			   struct device *dev)
4793 {
4794 	struct iscsi_cls_session *session;
4795 	struct iscsi_cls_conn *conn;
4796 	struct Scsi_Host *shost;
4797 	struct iscsi_internal *priv;
4798 
4799 	if (!iscsi_is_conn_dev(dev))
4800 		return 0;
4801 
4802 	conn = iscsi_dev_to_conn(dev);
4803 	session = iscsi_dev_to_session(conn->dev.parent);
4804 	shost = iscsi_session_to_shost(session);
4805 
4806 	if (!shost->transportt)
4807 		return 0;
4808 
4809 	priv = to_iscsi_internal(shost->transportt);
4810 	if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4811 		return 0;
4812 
4813 	return &priv->conn_cont.ac == cont;
4814 }
4815 
iscsi_host_match(struct attribute_container * cont,struct device * dev)4816 static int iscsi_host_match(struct attribute_container *cont,
4817 			    struct device *dev)
4818 {
4819 	struct Scsi_Host *shost;
4820 	struct iscsi_internal *priv;
4821 
4822 	if (!scsi_is_host_device(dev))
4823 		return 0;
4824 
4825 	shost = dev_to_shost(dev);
4826 	if (!shost->transportt  ||
4827 	    shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4828 		return 0;
4829 
4830         priv = to_iscsi_internal(shost->transportt);
4831         return &priv->t.host_attrs.ac == cont;
4832 }
4833 
4834 struct scsi_transport_template *
iscsi_register_transport(struct iscsi_transport * tt)4835 iscsi_register_transport(struct iscsi_transport *tt)
4836 {
4837 	struct iscsi_internal *priv;
4838 	unsigned long flags;
4839 	int err;
4840 
4841 	BUG_ON(!tt);
4842 	WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4843 
4844 	priv = iscsi_if_transport_lookup(tt);
4845 	if (priv)
4846 		return NULL;
4847 
4848 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4849 	if (!priv)
4850 		return NULL;
4851 	INIT_LIST_HEAD(&priv->list);
4852 	priv->iscsi_transport = tt;
4853 	priv->t.user_scan = iscsi_user_scan;
4854 
4855 	priv->dev.class = &iscsi_transport_class;
4856 	dev_set_name(&priv->dev, "%s", tt->name);
4857 	err = device_register(&priv->dev);
4858 	if (err)
4859 		goto put_dev;
4860 
4861 	err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4862 	if (err)
4863 		goto unregister_dev;
4864 
4865 	/* host parameters */
4866 	priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4867 	priv->t.host_attrs.ac.match = iscsi_host_match;
4868 	priv->t.host_attrs.ac.grp = &iscsi_host_group;
4869 	priv->t.host_size = sizeof(struct iscsi_cls_host);
4870 	transport_container_register(&priv->t.host_attrs);
4871 
4872 	/* connection parameters */
4873 	priv->conn_cont.ac.class = &iscsi_connection_class.class;
4874 	priv->conn_cont.ac.match = iscsi_conn_match;
4875 	priv->conn_cont.ac.grp = &iscsi_conn_group;
4876 	transport_container_register(&priv->conn_cont);
4877 
4878 	/* session parameters */
4879 	priv->session_cont.ac.class = &iscsi_session_class.class;
4880 	priv->session_cont.ac.match = iscsi_session_match;
4881 	priv->session_cont.ac.grp = &iscsi_session_group;
4882 	transport_container_register(&priv->session_cont);
4883 
4884 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4885 	list_add(&priv->list, &iscsi_transports);
4886 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4887 
4888 	printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4889 	return &priv->t;
4890 
4891 unregister_dev:
4892 	device_unregister(&priv->dev);
4893 	return NULL;
4894 put_dev:
4895 	put_device(&priv->dev);
4896 	return NULL;
4897 }
4898 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4899 
iscsi_unregister_transport(struct iscsi_transport * tt)4900 void iscsi_unregister_transport(struct iscsi_transport *tt)
4901 {
4902 	struct iscsi_internal *priv;
4903 	unsigned long flags;
4904 
4905 	BUG_ON(!tt);
4906 
4907 	mutex_lock(&rx_queue_mutex);
4908 
4909 	priv = iscsi_if_transport_lookup(tt);
4910 	BUG_ON (!priv);
4911 
4912 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4913 	list_del(&priv->list);
4914 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4915 
4916 	transport_container_unregister(&priv->conn_cont);
4917 	transport_container_unregister(&priv->session_cont);
4918 	transport_container_unregister(&priv->t.host_attrs);
4919 
4920 	sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4921 	device_unregister(&priv->dev);
4922 	mutex_unlock(&rx_queue_mutex);
4923 }
4924 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4925 
iscsi_dbg_trace(void (* trace)(struct device * dev,struct va_format *),struct device * dev,const char * fmt,...)4926 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4927 		     struct device *dev, const char *fmt, ...)
4928 {
4929 	struct va_format vaf;
4930 	va_list args;
4931 
4932 	va_start(args, fmt);
4933 	vaf.fmt = fmt;
4934 	vaf.va = &args;
4935 	trace(dev, &vaf);
4936 	va_end(args);
4937 }
4938 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4939 
iscsi_transport_init(void)4940 static __init int iscsi_transport_init(void)
4941 {
4942 	int err;
4943 	struct netlink_kernel_cfg cfg = {
4944 		.groups	= 1,
4945 		.input	= iscsi_if_rx,
4946 	};
4947 	printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4948 		ISCSI_TRANSPORT_VERSION);
4949 
4950 	atomic_set(&iscsi_session_nr, 0);
4951 
4952 	err = class_register(&iscsi_transport_class);
4953 	if (err)
4954 		return err;
4955 
4956 	err = class_register(&iscsi_endpoint_class);
4957 	if (err)
4958 		goto unregister_transport_class;
4959 
4960 	err = class_register(&iscsi_iface_class);
4961 	if (err)
4962 		goto unregister_endpoint_class;
4963 
4964 	err = transport_class_register(&iscsi_host_class);
4965 	if (err)
4966 		goto unregister_iface_class;
4967 
4968 	err = transport_class_register(&iscsi_connection_class);
4969 	if (err)
4970 		goto unregister_host_class;
4971 
4972 	err = transport_class_register(&iscsi_session_class);
4973 	if (err)
4974 		goto unregister_conn_class;
4975 
4976 	err = bus_register(&iscsi_flashnode_bus);
4977 	if (err)
4978 		goto unregister_session_class;
4979 
4980 	nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4981 	if (!nls) {
4982 		err = -ENOBUFS;
4983 		goto unregister_flashnode_bus;
4984 	}
4985 
4986 	iscsi_conn_cleanup_workq = alloc_workqueue("%s",
4987 			WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
4988 			"iscsi_conn_cleanup");
4989 	if (!iscsi_conn_cleanup_workq) {
4990 		err = -ENOMEM;
4991 		goto release_nls;
4992 	}
4993 
4994 	return 0;
4995 
4996 release_nls:
4997 	netlink_kernel_release(nls);
4998 unregister_flashnode_bus:
4999 	bus_unregister(&iscsi_flashnode_bus);
5000 unregister_session_class:
5001 	transport_class_unregister(&iscsi_session_class);
5002 unregister_conn_class:
5003 	transport_class_unregister(&iscsi_connection_class);
5004 unregister_host_class:
5005 	transport_class_unregister(&iscsi_host_class);
5006 unregister_iface_class:
5007 	class_unregister(&iscsi_iface_class);
5008 unregister_endpoint_class:
5009 	class_unregister(&iscsi_endpoint_class);
5010 unregister_transport_class:
5011 	class_unregister(&iscsi_transport_class);
5012 	return err;
5013 }
5014 
iscsi_transport_exit(void)5015 static void __exit iscsi_transport_exit(void)
5016 {
5017 	destroy_workqueue(iscsi_conn_cleanup_workq);
5018 	netlink_kernel_release(nls);
5019 	bus_unregister(&iscsi_flashnode_bus);
5020 	transport_class_unregister(&iscsi_connection_class);
5021 	transport_class_unregister(&iscsi_session_class);
5022 	transport_class_unregister(&iscsi_host_class);
5023 	class_unregister(&iscsi_endpoint_class);
5024 	class_unregister(&iscsi_iface_class);
5025 	class_unregister(&iscsi_transport_class);
5026 }
5027 
5028 module_init(iscsi_transport_init);
5029 module_exit(iscsi_transport_exit);
5030 
5031 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
5032 	      "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
5033 	      "Alex Aizman <itn780@yahoo.com>");
5034 MODULE_DESCRIPTION("iSCSI Transport Interface");
5035 MODULE_LICENSE("GPL");
5036 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
5037 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
5038