xref: /linux/drivers/scsi/scsi_transport_iscsi.c (revision d69d8048)
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 const struct bus_type iscsi_flashnode_bus;
1205 
iscsi_flashnode_bus_match(struct device * dev,const struct device_driver * drv)1206 int iscsi_flashnode_bus_match(struct device *dev,
1207 			      const 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 const 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 queue_limits lim;
1539 	struct request_queue *q;
1540 	char bsg_name[20];
1541 
1542 	if (!i->iscsi_transport->bsg_request)
1543 		return -ENOTSUPP;
1544 
1545 	snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1546 	scsi_init_limits(shost, &lim);
1547 	q = bsg_setup_queue(dev, bsg_name, &lim, iscsi_bsg_host_dispatch, NULL,
1548 			0);
1549 	if (IS_ERR(q)) {
1550 		shost_printk(KERN_ERR, shost, "bsg interface failed to "
1551 			     "initialize - no request queue\n");
1552 		return PTR_ERR(q);
1553 	}
1554 
1555 	ihost->bsg_q = q;
1556 	return 0;
1557 }
1558 
iscsi_setup_host(struct transport_container * tc,struct device * dev,struct device * cdev)1559 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1560 			    struct device *cdev)
1561 {
1562 	struct Scsi_Host *shost = dev_to_shost(dev);
1563 	struct iscsi_cls_host *ihost = shost->shost_data;
1564 
1565 	memset(ihost, 0, sizeof(*ihost));
1566 	mutex_init(&ihost->mutex);
1567 
1568 	iscsi_bsg_host_add(shost, ihost);
1569 	/* ignore any bsg add error - we just can't do sgio */
1570 
1571 	return 0;
1572 }
1573 
iscsi_remove_host(struct transport_container * tc,struct device * dev,struct device * cdev)1574 static int iscsi_remove_host(struct transport_container *tc,
1575 			     struct device *dev, struct device *cdev)
1576 {
1577 	struct Scsi_Host *shost = dev_to_shost(dev);
1578 	struct iscsi_cls_host *ihost = shost->shost_data;
1579 
1580 	bsg_remove_queue(ihost->bsg_q);
1581 	return 0;
1582 }
1583 
1584 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1585 			       "iscsi_host",
1586 			       iscsi_setup_host,
1587 			       iscsi_remove_host,
1588 			       NULL);
1589 
1590 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1591 			       "iscsi_session",
1592 			       NULL,
1593 			       NULL,
1594 			       NULL);
1595 
1596 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1597 			       "iscsi_connection",
1598 			       NULL,
1599 			       NULL,
1600 			       NULL);
1601 
1602 static struct sock *nls;
1603 static DEFINE_MUTEX(rx_queue_mutex);
1604 
1605 static LIST_HEAD(sesslist);
1606 static DEFINE_SPINLOCK(sesslock);
1607 static LIST_HEAD(connlist);
1608 static DEFINE_SPINLOCK(connlock);
1609 
iscsi_conn_get_sid(struct iscsi_cls_conn * conn)1610 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1611 {
1612 	struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1613 	return sess->sid;
1614 }
1615 
1616 /*
1617  * Returns the matching session to a given sid
1618  */
iscsi_session_lookup(uint32_t sid)1619 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1620 {
1621 	unsigned long flags;
1622 	struct iscsi_cls_session *sess;
1623 
1624 	spin_lock_irqsave(&sesslock, flags);
1625 	list_for_each_entry(sess, &sesslist, sess_list) {
1626 		if (sess->sid == sid) {
1627 			spin_unlock_irqrestore(&sesslock, flags);
1628 			return sess;
1629 		}
1630 	}
1631 	spin_unlock_irqrestore(&sesslock, flags);
1632 	return NULL;
1633 }
1634 
1635 /*
1636  * Returns the matching connection to a given sid / cid tuple
1637  */
iscsi_conn_lookup(uint32_t sid,uint32_t cid)1638 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1639 {
1640 	unsigned long flags;
1641 	struct iscsi_cls_conn *conn;
1642 
1643 	spin_lock_irqsave(&connlock, flags);
1644 	list_for_each_entry(conn, &connlist, conn_list) {
1645 		if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1646 			spin_unlock_irqrestore(&connlock, flags);
1647 			return conn;
1648 		}
1649 	}
1650 	spin_unlock_irqrestore(&connlock, flags);
1651 	return NULL;
1652 }
1653 
1654 /*
1655  * The following functions can be used by LLDs that allocate
1656  * their own scsi_hosts or by software iscsi LLDs
1657  */
1658 static struct {
1659 	int value;
1660 	char *name;
1661 } iscsi_session_state_names[] = {
1662 	{ ISCSI_SESSION_LOGGED_IN,	"LOGGED_IN" },
1663 	{ ISCSI_SESSION_FAILED,		"FAILED" },
1664 	{ ISCSI_SESSION_FREE,		"FREE" },
1665 };
1666 
iscsi_session_state_name(int state)1667 static const char *iscsi_session_state_name(int state)
1668 {
1669 	int i;
1670 	char *name = NULL;
1671 
1672 	for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1673 		if (iscsi_session_state_names[i].value == state) {
1674 			name = iscsi_session_state_names[i].name;
1675 			break;
1676 		}
1677 	}
1678 	return name;
1679 }
1680 
1681 static char *iscsi_session_target_state_name[] = {
1682 	[ISCSI_SESSION_TARGET_UNBOUND]   = "UNBOUND",
1683 	[ISCSI_SESSION_TARGET_ALLOCATED] = "ALLOCATED",
1684 	[ISCSI_SESSION_TARGET_SCANNED]   = "SCANNED",
1685 	[ISCSI_SESSION_TARGET_UNBINDING] = "UNBINDING",
1686 };
1687 
iscsi_session_chkready(struct iscsi_cls_session * session)1688 int iscsi_session_chkready(struct iscsi_cls_session *session)
1689 {
1690 	int err;
1691 
1692 	switch (session->state) {
1693 	case ISCSI_SESSION_LOGGED_IN:
1694 		err = 0;
1695 		break;
1696 	case ISCSI_SESSION_FAILED:
1697 		err = DID_IMM_RETRY << 16;
1698 		break;
1699 	case ISCSI_SESSION_FREE:
1700 		err = DID_TRANSPORT_FAILFAST << 16;
1701 		break;
1702 	default:
1703 		err = DID_NO_CONNECT << 16;
1704 		break;
1705 	}
1706 	return err;
1707 }
1708 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1709 
iscsi_is_session_online(struct iscsi_cls_session * session)1710 int iscsi_is_session_online(struct iscsi_cls_session *session)
1711 {
1712 	unsigned long flags;
1713 	int ret = 0;
1714 
1715 	spin_lock_irqsave(&session->lock, flags);
1716 	if (session->state == ISCSI_SESSION_LOGGED_IN)
1717 		ret = 1;
1718 	spin_unlock_irqrestore(&session->lock, flags);
1719 	return ret;
1720 }
1721 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1722 
iscsi_session_release(struct device * dev)1723 static void iscsi_session_release(struct device *dev)
1724 {
1725 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1726 	struct Scsi_Host *shost;
1727 
1728 	shost = iscsi_session_to_shost(session);
1729 	scsi_host_put(shost);
1730 	ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1731 	kfree(session);
1732 }
1733 
iscsi_is_session_dev(const struct device * dev)1734 int iscsi_is_session_dev(const struct device *dev)
1735 {
1736 	return dev->release == iscsi_session_release;
1737 }
1738 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1739 
iscsi_iter_session_fn(struct device * dev,void * data)1740 static int iscsi_iter_session_fn(struct device *dev, void *data)
1741 {
1742 	void (* fn) (struct iscsi_cls_session *) = data;
1743 
1744 	if (!iscsi_is_session_dev(dev))
1745 		return 0;
1746 	fn(iscsi_dev_to_session(dev));
1747 	return 0;
1748 }
1749 
iscsi_host_for_each_session(struct Scsi_Host * shost,void (* fn)(struct iscsi_cls_session *))1750 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1751 				 void (*fn)(struct iscsi_cls_session *))
1752 {
1753 	device_for_each_child(&shost->shost_gendev, fn,
1754 			      iscsi_iter_session_fn);
1755 }
1756 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1757 
1758 struct iscsi_scan_data {
1759 	unsigned int channel;
1760 	unsigned int id;
1761 	u64 lun;
1762 	enum scsi_scan_mode rescan;
1763 };
1764 
iscsi_user_scan_session(struct device * dev,void * data)1765 static int iscsi_user_scan_session(struct device *dev, void *data)
1766 {
1767 	struct iscsi_scan_data *scan_data = data;
1768 	struct iscsi_cls_session *session;
1769 	struct Scsi_Host *shost;
1770 	struct iscsi_cls_host *ihost;
1771 	unsigned long flags;
1772 	unsigned int id;
1773 
1774 	if (!iscsi_is_session_dev(dev))
1775 		return 0;
1776 
1777 	session = iscsi_dev_to_session(dev);
1778 
1779 	ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1780 
1781 	shost = iscsi_session_to_shost(session);
1782 	ihost = shost->shost_data;
1783 
1784 	mutex_lock(&ihost->mutex);
1785 	spin_lock_irqsave(&session->lock, flags);
1786 	if (session->state != ISCSI_SESSION_LOGGED_IN) {
1787 		spin_unlock_irqrestore(&session->lock, flags);
1788 		goto user_scan_exit;
1789 	}
1790 	id = session->target_id;
1791 	spin_unlock_irqrestore(&session->lock, flags);
1792 
1793 	if (id != ISCSI_MAX_TARGET) {
1794 		if ((scan_data->channel == SCAN_WILD_CARD ||
1795 		     scan_data->channel == 0) &&
1796 		    (scan_data->id == SCAN_WILD_CARD ||
1797 		     scan_data->id == id)) {
1798 			scsi_scan_target(&session->dev, 0, id,
1799 					 scan_data->lun, scan_data->rescan);
1800 			spin_lock_irqsave(&session->lock, flags);
1801 			session->target_state = ISCSI_SESSION_TARGET_SCANNED;
1802 			spin_unlock_irqrestore(&session->lock, flags);
1803 		}
1804 	}
1805 
1806 user_scan_exit:
1807 	mutex_unlock(&ihost->mutex);
1808 	ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1809 	return 0;
1810 }
1811 
iscsi_user_scan(struct Scsi_Host * shost,uint channel,uint id,u64 lun)1812 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1813 			   uint id, u64 lun)
1814 {
1815 	struct iscsi_scan_data scan_data;
1816 
1817 	scan_data.channel = channel;
1818 	scan_data.id = id;
1819 	scan_data.lun = lun;
1820 	scan_data.rescan = SCSI_SCAN_MANUAL;
1821 
1822 	return device_for_each_child(&shost->shost_gendev, &scan_data,
1823 				     iscsi_user_scan_session);
1824 }
1825 
iscsi_scan_session(struct work_struct * work)1826 static void iscsi_scan_session(struct work_struct *work)
1827 {
1828 	struct iscsi_cls_session *session =
1829 			container_of(work, struct iscsi_cls_session, scan_work);
1830 	struct iscsi_scan_data scan_data;
1831 
1832 	scan_data.channel = 0;
1833 	scan_data.id = SCAN_WILD_CARD;
1834 	scan_data.lun = SCAN_WILD_CARD;
1835 	scan_data.rescan = SCSI_SCAN_RESCAN;
1836 
1837 	iscsi_user_scan_session(&session->dev, &scan_data);
1838 }
1839 
1840 /**
1841  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1842  * @cmd: scsi cmd passed to scsi eh handler
1843  *
1844  * If the session is down this function will wait for the recovery
1845  * timer to fire or for the session to be logged back in. If the
1846  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1847  * should pass this error value to the scsi eh.
1848  */
iscsi_block_scsi_eh(struct scsi_cmnd * cmd)1849 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1850 {
1851 	struct iscsi_cls_session *session =
1852 			starget_to_session(scsi_target(cmd->device));
1853 	unsigned long flags;
1854 	int ret = 0;
1855 
1856 	spin_lock_irqsave(&session->lock, flags);
1857 	while (session->state != ISCSI_SESSION_LOGGED_IN) {
1858 		if (session->state == ISCSI_SESSION_FREE) {
1859 			ret = FAST_IO_FAIL;
1860 			break;
1861 		}
1862 		spin_unlock_irqrestore(&session->lock, flags);
1863 		msleep(1000);
1864 		spin_lock_irqsave(&session->lock, flags);
1865 	}
1866 	spin_unlock_irqrestore(&session->lock, flags);
1867 	return ret;
1868 }
1869 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1870 
session_recovery_timedout(struct work_struct * work)1871 static void session_recovery_timedout(struct work_struct *work)
1872 {
1873 	struct iscsi_cls_session *session =
1874 		container_of(work, struct iscsi_cls_session,
1875 			     recovery_work.work);
1876 	unsigned long flags;
1877 
1878 	iscsi_cls_session_printk(KERN_INFO, session,
1879 				 "session recovery timed out after %d secs\n",
1880 				 session->recovery_tmo);
1881 
1882 	spin_lock_irqsave(&session->lock, flags);
1883 	switch (session->state) {
1884 	case ISCSI_SESSION_FAILED:
1885 		session->state = ISCSI_SESSION_FREE;
1886 		break;
1887 	case ISCSI_SESSION_LOGGED_IN:
1888 	case ISCSI_SESSION_FREE:
1889 		/* we raced with the unblock's flush */
1890 		spin_unlock_irqrestore(&session->lock, flags);
1891 		return;
1892 	}
1893 	spin_unlock_irqrestore(&session->lock, flags);
1894 
1895 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1896 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1897 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1898 
1899 	if (session->transport->session_recovery_timedout)
1900 		session->transport->session_recovery_timedout(session);
1901 }
1902 
__iscsi_unblock_session(struct work_struct * work)1903 static void __iscsi_unblock_session(struct work_struct *work)
1904 {
1905 	struct iscsi_cls_session *session =
1906 			container_of(work, struct iscsi_cls_session,
1907 				     unblock_work);
1908 	unsigned long flags;
1909 
1910 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1911 
1912 	cancel_delayed_work_sync(&session->recovery_work);
1913 	spin_lock_irqsave(&session->lock, flags);
1914 	session->state = ISCSI_SESSION_LOGGED_IN;
1915 	spin_unlock_irqrestore(&session->lock, flags);
1916 	/* start IO */
1917 	scsi_target_unblock(&session->dev, SDEV_RUNNING);
1918 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1919 }
1920 
1921 /**
1922  * iscsi_unblock_session - set a session as logged in and start IO.
1923  * @session: iscsi session
1924  *
1925  * Mark a session as ready to accept IO.
1926  */
iscsi_unblock_session(struct iscsi_cls_session * session)1927 void iscsi_unblock_session(struct iscsi_cls_session *session)
1928 {
1929 	if (!cancel_work_sync(&session->block_work))
1930 		cancel_delayed_work_sync(&session->recovery_work);
1931 
1932 	queue_work(session->workq, &session->unblock_work);
1933 	/*
1934 	 * Blocking the session can be done from any context so we only
1935 	 * queue the block work. Make sure the unblock work has completed
1936 	 * because it flushes/cancels the other works and updates the state.
1937 	 */
1938 	flush_work(&session->unblock_work);
1939 }
1940 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1941 
__iscsi_block_session(struct work_struct * work)1942 static void __iscsi_block_session(struct work_struct *work)
1943 {
1944 	struct iscsi_cls_session *session =
1945 			container_of(work, struct iscsi_cls_session,
1946 				     block_work);
1947 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1948 	unsigned long flags;
1949 
1950 	ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1951 	spin_lock_irqsave(&session->lock, flags);
1952 	session->state = ISCSI_SESSION_FAILED;
1953 	spin_unlock_irqrestore(&session->lock, flags);
1954 	scsi_block_targets(shost, &session->dev);
1955 	ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1956 	if (session->recovery_tmo >= 0)
1957 		queue_delayed_work(session->workq,
1958 				   &session->recovery_work,
1959 				   session->recovery_tmo * HZ);
1960 }
1961 
iscsi_block_session(struct iscsi_cls_session * session)1962 void iscsi_block_session(struct iscsi_cls_session *session)
1963 {
1964 	queue_work(session->workq, &session->block_work);
1965 }
1966 EXPORT_SYMBOL_GPL(iscsi_block_session);
1967 
__iscsi_unbind_session(struct work_struct * work)1968 static void __iscsi_unbind_session(struct work_struct *work)
1969 {
1970 	struct iscsi_cls_session *session =
1971 			container_of(work, struct iscsi_cls_session,
1972 				     unbind_work);
1973 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1974 	struct iscsi_cls_host *ihost = shost->shost_data;
1975 	unsigned long flags;
1976 	unsigned int target_id;
1977 	bool remove_target = true;
1978 
1979 	ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1980 
1981 	/* Prevent new scans and make sure scanning is not in progress */
1982 	mutex_lock(&ihost->mutex);
1983 	spin_lock_irqsave(&session->lock, flags);
1984 	if (session->target_state == ISCSI_SESSION_TARGET_ALLOCATED) {
1985 		remove_target = false;
1986 	} else if (session->target_state != ISCSI_SESSION_TARGET_SCANNED) {
1987 		spin_unlock_irqrestore(&session->lock, flags);
1988 		mutex_unlock(&ihost->mutex);
1989 		ISCSI_DBG_TRANS_SESSION(session,
1990 			"Skipping target unbinding: Session is unbound/unbinding.\n");
1991 		return;
1992 	}
1993 
1994 	session->target_state = ISCSI_SESSION_TARGET_UNBINDING;
1995 	target_id = session->target_id;
1996 	session->target_id = ISCSI_MAX_TARGET;
1997 	spin_unlock_irqrestore(&session->lock, flags);
1998 	mutex_unlock(&ihost->mutex);
1999 
2000 	if (remove_target)
2001 		scsi_remove_target(&session->dev);
2002 
2003 	if (session->ida_used)
2004 		ida_free(&iscsi_sess_ida, target_id);
2005 
2006 	iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2007 	ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2008 
2009 	spin_lock_irqsave(&session->lock, flags);
2010 	session->target_state = ISCSI_SESSION_TARGET_UNBOUND;
2011 	spin_unlock_irqrestore(&session->lock, flags);
2012 }
2013 
__iscsi_destroy_session(struct work_struct * work)2014 static void __iscsi_destroy_session(struct work_struct *work)
2015 {
2016 	struct iscsi_cls_session *session =
2017 		container_of(work, struct iscsi_cls_session, destroy_work);
2018 
2019 	session->transport->destroy_session(session);
2020 }
2021 
2022 struct iscsi_cls_session *
iscsi_alloc_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size)2023 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2024 		    int dd_size)
2025 {
2026 	struct iscsi_cls_session *session;
2027 
2028 	session = kzalloc(sizeof(*session) + dd_size,
2029 			  GFP_KERNEL);
2030 	if (!session)
2031 		return NULL;
2032 
2033 	session->transport = transport;
2034 	session->creator = -1;
2035 	session->recovery_tmo = 120;
2036 	session->recovery_tmo_sysfs_override = false;
2037 	session->state = ISCSI_SESSION_FREE;
2038 	INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2039 	INIT_LIST_HEAD(&session->sess_list);
2040 	INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2041 	INIT_WORK(&session->block_work, __iscsi_block_session);
2042 	INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2043 	INIT_WORK(&session->scan_work, iscsi_scan_session);
2044 	INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2045 	spin_lock_init(&session->lock);
2046 
2047 	/* this is released in the dev's release function */
2048 	scsi_host_get(shost);
2049 	session->dev.parent = &shost->shost_gendev;
2050 	session->dev.release = iscsi_session_release;
2051 	device_initialize(&session->dev);
2052 	if (dd_size)
2053 		session->dd_data = &session[1];
2054 
2055 	ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2056 	return session;
2057 }
2058 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2059 
iscsi_add_session(struct iscsi_cls_session * session,unsigned int target_id)2060 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2061 {
2062 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
2063 	unsigned long flags;
2064 	int id = 0;
2065 	int err;
2066 
2067 	session->sid = atomic_add_return(1, &iscsi_session_nr);
2068 
2069 	session->workq = alloc_workqueue("iscsi_ctrl_%d:%d",
2070 			WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
2071 			shost->host_no, session->sid);
2072 	if (!session->workq)
2073 		return -ENOMEM;
2074 
2075 	if (target_id == ISCSI_MAX_TARGET) {
2076 		id = ida_alloc(&iscsi_sess_ida, GFP_KERNEL);
2077 
2078 		if (id < 0) {
2079 			iscsi_cls_session_printk(KERN_ERR, session,
2080 					"Failure in Target ID Allocation\n");
2081 			err = id;
2082 			goto destroy_wq;
2083 		}
2084 		session->target_id = (unsigned int)id;
2085 		session->ida_used = true;
2086 	} else
2087 		session->target_id = target_id;
2088 	spin_lock_irqsave(&session->lock, flags);
2089 	session->target_state = ISCSI_SESSION_TARGET_ALLOCATED;
2090 	spin_unlock_irqrestore(&session->lock, flags);
2091 
2092 	dev_set_name(&session->dev, "session%u", session->sid);
2093 	err = device_add(&session->dev);
2094 	if (err) {
2095 		iscsi_cls_session_printk(KERN_ERR, session,
2096 					 "could not register session's dev\n");
2097 		goto release_ida;
2098 	}
2099 	err = transport_register_device(&session->dev);
2100 	if (err) {
2101 		iscsi_cls_session_printk(KERN_ERR, session,
2102 					 "could not register transport's dev\n");
2103 		goto release_dev;
2104 	}
2105 
2106 	spin_lock_irqsave(&sesslock, flags);
2107 	list_add(&session->sess_list, &sesslist);
2108 	spin_unlock_irqrestore(&sesslock, flags);
2109 
2110 	iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2111 	ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2112 	return 0;
2113 
2114 release_dev:
2115 	device_del(&session->dev);
2116 release_ida:
2117 	if (session->ida_used)
2118 		ida_free(&iscsi_sess_ida, session->target_id);
2119 destroy_wq:
2120 	destroy_workqueue(session->workq);
2121 	return err;
2122 }
2123 EXPORT_SYMBOL_GPL(iscsi_add_session);
2124 
2125 /**
2126  * iscsi_create_session - create iscsi class session
2127  * @shost: scsi host
2128  * @transport: iscsi transport
2129  * @dd_size: private driver data size
2130  * @target_id: which target
2131  *
2132  * This can be called from a LLD or iscsi_transport.
2133  */
2134 struct iscsi_cls_session *
iscsi_create_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size,unsigned int target_id)2135 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2136 		     int dd_size, unsigned int target_id)
2137 {
2138 	struct iscsi_cls_session *session;
2139 
2140 	session = iscsi_alloc_session(shost, transport, dd_size);
2141 	if (!session)
2142 		return NULL;
2143 
2144 	if (iscsi_add_session(session, target_id)) {
2145 		iscsi_free_session(session);
2146 		return NULL;
2147 	}
2148 	return session;
2149 }
2150 EXPORT_SYMBOL_GPL(iscsi_create_session);
2151 
iscsi_conn_release(struct device * dev)2152 static void iscsi_conn_release(struct device *dev)
2153 {
2154 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2155 	struct device *parent = conn->dev.parent;
2156 
2157 	ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2158 	kfree(conn);
2159 	put_device(parent);
2160 }
2161 
iscsi_is_conn_dev(const struct device * dev)2162 static int iscsi_is_conn_dev(const struct device *dev)
2163 {
2164 	return dev->release == iscsi_conn_release;
2165 }
2166 
iscsi_iter_destroy_conn_fn(struct device * dev,void * data)2167 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2168 {
2169 	if (!iscsi_is_conn_dev(dev))
2170 		return 0;
2171 
2172 	iscsi_remove_conn(iscsi_dev_to_conn(dev));
2173 	return 0;
2174 }
2175 
iscsi_remove_session(struct iscsi_cls_session * session)2176 void iscsi_remove_session(struct iscsi_cls_session *session)
2177 {
2178 	unsigned long flags;
2179 	int err;
2180 
2181 	ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2182 
2183 	spin_lock_irqsave(&sesslock, flags);
2184 	if (!list_empty(&session->sess_list))
2185 		list_del(&session->sess_list);
2186 	spin_unlock_irqrestore(&sesslock, flags);
2187 
2188 	if (!cancel_work_sync(&session->block_work))
2189 		cancel_delayed_work_sync(&session->recovery_work);
2190 	cancel_work_sync(&session->unblock_work);
2191 	/*
2192 	 * If we are blocked let commands flow again. The lld or iscsi
2193 	 * layer should set up the queuecommand to fail commands.
2194 	 * We assume that LLD will not be calling block/unblock while
2195 	 * removing the session.
2196 	 */
2197 	spin_lock_irqsave(&session->lock, flags);
2198 	session->state = ISCSI_SESSION_FREE;
2199 	spin_unlock_irqrestore(&session->lock, flags);
2200 
2201 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2202 	/*
2203 	 * qla4xxx can perform it's own scans when it runs in kernel only
2204 	 * mode. Make sure to flush those scans.
2205 	 */
2206 	flush_work(&session->scan_work);
2207 	/* flush running unbind operations */
2208 	flush_work(&session->unbind_work);
2209 	__iscsi_unbind_session(&session->unbind_work);
2210 
2211 	/* hw iscsi may not have removed all connections from session */
2212 	err = device_for_each_child(&session->dev, NULL,
2213 				    iscsi_iter_destroy_conn_fn);
2214 	if (err)
2215 		iscsi_cls_session_printk(KERN_ERR, session,
2216 					 "Could not delete all connections "
2217 					 "for session. Error %d.\n", err);
2218 
2219 	transport_unregister_device(&session->dev);
2220 
2221 	destroy_workqueue(session->workq);
2222 
2223 	ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2224 	device_del(&session->dev);
2225 }
2226 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2227 
iscsi_stop_conn(struct iscsi_cls_conn * conn,int flag)2228 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2229 {
2230 	ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2231 
2232 	switch (flag) {
2233 	case STOP_CONN_RECOVER:
2234 		WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2235 		break;
2236 	case STOP_CONN_TERM:
2237 		WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2238 		break;
2239 	default:
2240 		iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2241 				      flag);
2242 		return;
2243 	}
2244 
2245 	conn->transport->stop_conn(conn, flag);
2246 	ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2247 }
2248 
iscsi_ep_disconnect(struct iscsi_cls_conn * conn,bool is_active)2249 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2250 {
2251 	struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2252 	struct iscsi_endpoint *ep;
2253 
2254 	ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2255 	WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2256 
2257 	if (!conn->ep || !session->transport->ep_disconnect)
2258 		return;
2259 
2260 	ep = conn->ep;
2261 	conn->ep = NULL;
2262 
2263 	session->transport->unbind_conn(conn, is_active);
2264 	session->transport->ep_disconnect(ep);
2265 	ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2266 }
2267 
iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn * conn,struct iscsi_endpoint * ep,bool is_active)2268 static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
2269 					 struct iscsi_endpoint *ep,
2270 					 bool is_active)
2271 {
2272 	/* Check if this was a conn error and the kernel took ownership */
2273 	spin_lock_irq(&conn->lock);
2274 	if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2275 		spin_unlock_irq(&conn->lock);
2276 		iscsi_ep_disconnect(conn, is_active);
2277 	} else {
2278 		spin_unlock_irq(&conn->lock);
2279 		ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2280 		mutex_unlock(&conn->ep_mutex);
2281 
2282 		flush_work(&conn->cleanup_work);
2283 		/*
2284 		 * Userspace is now done with the EP so we can release the ref
2285 		 * iscsi_cleanup_conn_work_fn took.
2286 		 */
2287 		iscsi_put_endpoint(ep);
2288 		mutex_lock(&conn->ep_mutex);
2289 	}
2290 }
2291 
iscsi_if_stop_conn(struct iscsi_cls_conn * conn,int flag)2292 static int iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2293 {
2294 	ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2295 	/*
2296 	 * For offload, iscsid may not know about the ep like when iscsid is
2297 	 * restarted or for kernel based session shutdown iscsid is not even
2298 	 * up. For these cases, we do the disconnect now.
2299 	 */
2300 	mutex_lock(&conn->ep_mutex);
2301 	if (conn->ep)
2302 		iscsi_if_disconnect_bound_ep(conn, conn->ep, true);
2303 	mutex_unlock(&conn->ep_mutex);
2304 
2305 	/*
2306 	 * If this is a termination we have to call stop_conn with that flag
2307 	 * so the correct states get set. If we haven't run the work yet try to
2308 	 * avoid the extra run.
2309 	 */
2310 	if (flag == STOP_CONN_TERM) {
2311 		cancel_work_sync(&conn->cleanup_work);
2312 		iscsi_stop_conn(conn, flag);
2313 	} else {
2314 		/*
2315 		 * Figure out if it was the kernel or userspace initiating this.
2316 		 */
2317 		spin_lock_irq(&conn->lock);
2318 		if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2319 			spin_unlock_irq(&conn->lock);
2320 			iscsi_stop_conn(conn, flag);
2321 		} else {
2322 			spin_unlock_irq(&conn->lock);
2323 			ISCSI_DBG_TRANS_CONN(conn,
2324 					     "flush kernel conn cleanup.\n");
2325 			flush_work(&conn->cleanup_work);
2326 		}
2327 		/*
2328 		 * Only clear for recovery to avoid extra cleanup runs during
2329 		 * termination.
2330 		 */
2331 		spin_lock_irq(&conn->lock);
2332 		clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2333 		spin_unlock_irq(&conn->lock);
2334 	}
2335 	ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2336 	return 0;
2337 }
2338 
iscsi_cleanup_conn_work_fn(struct work_struct * work)2339 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2340 {
2341 	struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2342 						   cleanup_work);
2343 	struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2344 
2345 	mutex_lock(&conn->ep_mutex);
2346 	/*
2347 	 * Get a ref to the ep, so we don't release its ID until after
2348 	 * userspace is done referencing it in iscsi_if_disconnect_bound_ep.
2349 	 */
2350 	if (conn->ep)
2351 		get_device(&conn->ep->dev);
2352 	iscsi_ep_disconnect(conn, false);
2353 
2354 	if (system_state != SYSTEM_RUNNING) {
2355 		/*
2356 		 * If the user has set up for the session to never timeout
2357 		 * then hang like they wanted. For all other cases fail right
2358 		 * away since userspace is not going to relogin.
2359 		 */
2360 		if (session->recovery_tmo > 0)
2361 			session->recovery_tmo = 0;
2362 	}
2363 
2364 	iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2365 	mutex_unlock(&conn->ep_mutex);
2366 	ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2367 }
2368 
iscsi_iter_force_destroy_conn_fn(struct device * dev,void * data)2369 static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data)
2370 {
2371 	struct iscsi_transport *transport;
2372 	struct iscsi_cls_conn *conn;
2373 
2374 	if (!iscsi_is_conn_dev(dev))
2375 		return 0;
2376 
2377 	conn = iscsi_dev_to_conn(dev);
2378 	transport = conn->transport;
2379 
2380 	if (READ_ONCE(conn->state) != ISCSI_CONN_DOWN)
2381 		iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2382 
2383 	transport->destroy_conn(conn);
2384 	return 0;
2385 }
2386 
2387 /**
2388  * iscsi_force_destroy_session - destroy a session from the kernel
2389  * @session: session to destroy
2390  *
2391  * Force the destruction of a session from the kernel. This should only be
2392  * used when userspace is no longer running during system shutdown.
2393  */
iscsi_force_destroy_session(struct iscsi_cls_session * session)2394 void iscsi_force_destroy_session(struct iscsi_cls_session *session)
2395 {
2396 	struct iscsi_transport *transport = session->transport;
2397 	unsigned long flags;
2398 
2399 	WARN_ON_ONCE(system_state == SYSTEM_RUNNING);
2400 
2401 	spin_lock_irqsave(&sesslock, flags);
2402 	if (list_empty(&session->sess_list)) {
2403 		spin_unlock_irqrestore(&sesslock, flags);
2404 		/*
2405 		 * Conn/ep is already freed. Session is being torn down via
2406 		 * async path. For shutdown we don't care about it so return.
2407 		 */
2408 		return;
2409 	}
2410 	spin_unlock_irqrestore(&sesslock, flags);
2411 
2412 	device_for_each_child(&session->dev, NULL,
2413 			      iscsi_iter_force_destroy_conn_fn);
2414 	transport->destroy_session(session);
2415 }
2416 EXPORT_SYMBOL_GPL(iscsi_force_destroy_session);
2417 
iscsi_free_session(struct iscsi_cls_session * session)2418 void iscsi_free_session(struct iscsi_cls_session *session)
2419 {
2420 	ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2421 	iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2422 	put_device(&session->dev);
2423 }
2424 EXPORT_SYMBOL_GPL(iscsi_free_session);
2425 
2426 /**
2427  * iscsi_alloc_conn - alloc iscsi class connection
2428  * @session: iscsi cls session
2429  * @dd_size: private driver data size
2430  * @cid: connection id
2431  */
2432 struct iscsi_cls_conn *
iscsi_alloc_conn(struct iscsi_cls_session * session,int dd_size,uint32_t cid)2433 iscsi_alloc_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2434 {
2435 	struct iscsi_transport *transport = session->transport;
2436 	struct iscsi_cls_conn *conn;
2437 
2438 	conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2439 	if (!conn)
2440 		return NULL;
2441 	if (dd_size)
2442 		conn->dd_data = &conn[1];
2443 
2444 	mutex_init(&conn->ep_mutex);
2445 	spin_lock_init(&conn->lock);
2446 	INIT_LIST_HEAD(&conn->conn_list);
2447 	INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2448 	conn->transport = transport;
2449 	conn->cid = cid;
2450 	WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2451 
2452 	/* this is released in the dev's release function */
2453 	if (!get_device(&session->dev))
2454 		goto free_conn;
2455 
2456 	dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2457 	device_initialize(&conn->dev);
2458 	conn->dev.parent = &session->dev;
2459 	conn->dev.release = iscsi_conn_release;
2460 
2461 	return conn;
2462 
2463 free_conn:
2464 	kfree(conn);
2465 	return NULL;
2466 }
2467 EXPORT_SYMBOL_GPL(iscsi_alloc_conn);
2468 
2469 /**
2470  * iscsi_add_conn - add iscsi class connection
2471  * @conn: iscsi cls connection
2472  *
2473  * This will expose iscsi_cls_conn to sysfs so make sure the related
2474  * resources for sysfs attributes are initialized before calling this.
2475  */
iscsi_add_conn(struct iscsi_cls_conn * conn)2476 int iscsi_add_conn(struct iscsi_cls_conn *conn)
2477 {
2478 	int err;
2479 	unsigned long flags;
2480 	struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent);
2481 
2482 	err = device_add(&conn->dev);
2483 	if (err) {
2484 		iscsi_cls_session_printk(KERN_ERR, session,
2485 					 "could not register connection's dev\n");
2486 		return err;
2487 	}
2488 	err = transport_register_device(&conn->dev);
2489 	if (err) {
2490 		iscsi_cls_session_printk(KERN_ERR, session,
2491 					 "could not register transport's dev\n");
2492 		device_del(&conn->dev);
2493 		return err;
2494 	}
2495 
2496 	spin_lock_irqsave(&connlock, flags);
2497 	list_add(&conn->conn_list, &connlist);
2498 	spin_unlock_irqrestore(&connlock, flags);
2499 
2500 	return 0;
2501 }
2502 EXPORT_SYMBOL_GPL(iscsi_add_conn);
2503 
2504 /**
2505  * iscsi_remove_conn - remove iscsi class connection from sysfs
2506  * @conn: iscsi cls connection
2507  *
2508  * Remove iscsi_cls_conn from sysfs, and wait for previous
2509  * read/write of iscsi_cls_conn's attributes in sysfs to finish.
2510  */
iscsi_remove_conn(struct iscsi_cls_conn * conn)2511 void iscsi_remove_conn(struct iscsi_cls_conn *conn)
2512 {
2513 	unsigned long flags;
2514 
2515 	spin_lock_irqsave(&connlock, flags);
2516 	list_del(&conn->conn_list);
2517 	spin_unlock_irqrestore(&connlock, flags);
2518 
2519 	transport_unregister_device(&conn->dev);
2520 	device_del(&conn->dev);
2521 }
2522 EXPORT_SYMBOL_GPL(iscsi_remove_conn);
2523 
iscsi_put_conn(struct iscsi_cls_conn * conn)2524 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2525 {
2526 	put_device(&conn->dev);
2527 }
2528 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2529 
iscsi_get_conn(struct iscsi_cls_conn * conn)2530 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2531 {
2532 	get_device(&conn->dev);
2533 }
2534 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2535 
2536 /*
2537  * iscsi interface functions
2538  */
2539 static struct iscsi_internal *
iscsi_if_transport_lookup(struct iscsi_transport * tt)2540 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2541 {
2542 	struct iscsi_internal *priv;
2543 	unsigned long flags;
2544 
2545 	spin_lock_irqsave(&iscsi_transport_lock, flags);
2546 	list_for_each_entry(priv, &iscsi_transports, list) {
2547 		if (tt == priv->iscsi_transport) {
2548 			spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2549 			return priv;
2550 		}
2551 	}
2552 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2553 	return NULL;
2554 }
2555 
2556 static int
iscsi_multicast_skb(struct sk_buff * skb,uint32_t group,gfp_t gfp)2557 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2558 {
2559 	return nlmsg_multicast(nls, skb, 0, group, gfp);
2560 }
2561 
2562 static int
iscsi_unicast_skb(struct sk_buff * skb,u32 portid)2563 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2564 {
2565 	return nlmsg_unicast(nls, skb, portid);
2566 }
2567 
iscsi_recv_pdu(struct iscsi_cls_conn * conn,struct iscsi_hdr * hdr,char * data,uint32_t data_size)2568 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2569 		   char *data, uint32_t data_size)
2570 {
2571 	struct nlmsghdr	*nlh;
2572 	struct sk_buff *skb;
2573 	struct iscsi_uevent *ev;
2574 	char *pdu;
2575 	struct iscsi_internal *priv;
2576 	int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2577 				   data_size);
2578 
2579 	priv = iscsi_if_transport_lookup(conn->transport);
2580 	if (!priv)
2581 		return -EINVAL;
2582 
2583 	skb = alloc_skb(len, GFP_ATOMIC);
2584 	if (!skb) {
2585 		iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2586 		iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2587 				      "control PDU: OOM\n");
2588 		return -ENOMEM;
2589 	}
2590 
2591 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2592 	ev = nlmsg_data(nlh);
2593 	memset(ev, 0, sizeof(*ev));
2594 	ev->transport_handle = iscsi_handle(conn->transport);
2595 	ev->type = ISCSI_KEVENT_RECV_PDU;
2596 	ev->r.recv_req.cid = conn->cid;
2597 	ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2598 	pdu = (char*)ev + sizeof(*ev);
2599 	memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2600 	memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2601 
2602 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2603 }
2604 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2605 
iscsi_offload_mesg(struct Scsi_Host * shost,struct iscsi_transport * transport,uint32_t type,char * data,uint16_t data_size)2606 int iscsi_offload_mesg(struct Scsi_Host *shost,
2607 		       struct iscsi_transport *transport, uint32_t type,
2608 		       char *data, uint16_t data_size)
2609 {
2610 	struct nlmsghdr	*nlh;
2611 	struct sk_buff *skb;
2612 	struct iscsi_uevent *ev;
2613 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2614 
2615 	skb = alloc_skb(len, GFP_ATOMIC);
2616 	if (!skb) {
2617 		printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2618 		return -ENOMEM;
2619 	}
2620 
2621 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2622 	ev = nlmsg_data(nlh);
2623 	memset(ev, 0, sizeof(*ev));
2624 	ev->type = type;
2625 	ev->transport_handle = iscsi_handle(transport);
2626 	switch (type) {
2627 	case ISCSI_KEVENT_PATH_REQ:
2628 		ev->r.req_path.host_no = shost->host_no;
2629 		break;
2630 	case ISCSI_KEVENT_IF_DOWN:
2631 		ev->r.notify_if_down.host_no = shost->host_no;
2632 		break;
2633 	}
2634 
2635 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2636 
2637 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2638 }
2639 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2640 
iscsi_conn_error_event(struct iscsi_cls_conn * conn,enum iscsi_err error)2641 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2642 {
2643 	struct nlmsghdr	*nlh;
2644 	struct sk_buff	*skb;
2645 	struct iscsi_uevent *ev;
2646 	struct iscsi_internal *priv;
2647 	int len = nlmsg_total_size(sizeof(*ev));
2648 	unsigned long flags;
2649 	int state;
2650 
2651 	spin_lock_irqsave(&conn->lock, flags);
2652 	/*
2653 	 * Userspace will only do a stop call if we are at least bound. And, we
2654 	 * only need to do the in kernel cleanup if in the UP state so cmds can
2655 	 * be released to upper layers. If in other states just wait for
2656 	 * userspace to avoid races that can leave the cleanup_work queued.
2657 	 */
2658 	state = READ_ONCE(conn->state);
2659 	switch (state) {
2660 	case ISCSI_CONN_BOUND:
2661 	case ISCSI_CONN_UP:
2662 		if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP,
2663 				      &conn->flags)) {
2664 			queue_work(iscsi_conn_cleanup_workq,
2665 				   &conn->cleanup_work);
2666 		}
2667 		break;
2668 	default:
2669 		ISCSI_DBG_TRANS_CONN(conn, "Got conn error in state %d\n",
2670 				     state);
2671 		break;
2672 	}
2673 	spin_unlock_irqrestore(&conn->lock, flags);
2674 
2675 	priv = iscsi_if_transport_lookup(conn->transport);
2676 	if (!priv)
2677 		return;
2678 
2679 	skb = alloc_skb(len, GFP_ATOMIC);
2680 	if (!skb) {
2681 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2682 				      "conn error (%d)\n", error);
2683 		return;
2684 	}
2685 
2686 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2687 	ev = nlmsg_data(nlh);
2688 	ev->transport_handle = iscsi_handle(conn->transport);
2689 	ev->type = ISCSI_KEVENT_CONN_ERROR;
2690 	ev->r.connerror.error = error;
2691 	ev->r.connerror.cid = conn->cid;
2692 	ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2693 
2694 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2695 
2696 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2697 			      error);
2698 }
2699 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2700 
iscsi_conn_login_event(struct iscsi_cls_conn * conn,enum iscsi_conn_state state)2701 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2702 			    enum iscsi_conn_state state)
2703 {
2704 	struct nlmsghdr *nlh;
2705 	struct sk_buff  *skb;
2706 	struct iscsi_uevent *ev;
2707 	struct iscsi_internal *priv;
2708 	int len = nlmsg_total_size(sizeof(*ev));
2709 
2710 	priv = iscsi_if_transport_lookup(conn->transport);
2711 	if (!priv)
2712 		return;
2713 
2714 	skb = alloc_skb(len, GFP_ATOMIC);
2715 	if (!skb) {
2716 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2717 				      "conn login (%d)\n", state);
2718 		return;
2719 	}
2720 
2721 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2722 	ev = nlmsg_data(nlh);
2723 	ev->transport_handle = iscsi_handle(conn->transport);
2724 	ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2725 	ev->r.conn_login.state = state;
2726 	ev->r.conn_login.cid = conn->cid;
2727 	ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2728 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2729 
2730 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2731 			      state);
2732 }
2733 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2734 
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)2735 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2736 			   enum iscsi_host_event_code code, uint32_t data_size,
2737 			   uint8_t *data)
2738 {
2739 	struct nlmsghdr *nlh;
2740 	struct sk_buff *skb;
2741 	struct iscsi_uevent *ev;
2742 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2743 
2744 	skb = alloc_skb(len, GFP_NOIO);
2745 	if (!skb) {
2746 		printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2747 		       host_no, code);
2748 		return;
2749 	}
2750 
2751 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2752 	ev = nlmsg_data(nlh);
2753 	ev->transport_handle = iscsi_handle(transport);
2754 	ev->type = ISCSI_KEVENT_HOST_EVENT;
2755 	ev->r.host_event.host_no = host_no;
2756 	ev->r.host_event.code = code;
2757 	ev->r.host_event.data_size = data_size;
2758 
2759 	if (data_size)
2760 		memcpy((char *)ev + sizeof(*ev), data, data_size);
2761 
2762 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2763 }
2764 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2765 
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)2766 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2767 			   uint32_t status, uint32_t pid, uint32_t data_size,
2768 			   uint8_t *data)
2769 {
2770 	struct nlmsghdr *nlh;
2771 	struct sk_buff *skb;
2772 	struct iscsi_uevent *ev;
2773 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2774 
2775 	skb = alloc_skb(len, GFP_NOIO);
2776 	if (!skb) {
2777 		printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2778 		return;
2779 	}
2780 
2781 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2782 	ev = nlmsg_data(nlh);
2783 	ev->transport_handle = iscsi_handle(transport);
2784 	ev->type = ISCSI_KEVENT_PING_COMP;
2785 	ev->r.ping_comp.host_no = host_no;
2786 	ev->r.ping_comp.status = status;
2787 	ev->r.ping_comp.pid = pid;
2788 	ev->r.ping_comp.data_size = data_size;
2789 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2790 
2791 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2792 }
2793 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2794 
2795 static int
iscsi_if_send_reply(u32 portid,int type,void * payload,int size)2796 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2797 {
2798 	struct sk_buff	*skb;
2799 	struct nlmsghdr	*nlh;
2800 	int len = nlmsg_total_size(size);
2801 
2802 	skb = alloc_skb(len, GFP_ATOMIC);
2803 	if (!skb) {
2804 		printk(KERN_ERR "Could not allocate skb to send reply.\n");
2805 		return -ENOMEM;
2806 	}
2807 
2808 	nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2809 	memcpy(nlmsg_data(nlh), payload, size);
2810 	return iscsi_unicast_skb(skb, portid);
2811 }
2812 
2813 static int
iscsi_if_get_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)2814 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2815 {
2816 	struct iscsi_uevent *ev = nlmsg_data(nlh);
2817 	struct iscsi_stats *stats;
2818 	struct sk_buff *skbstat;
2819 	struct iscsi_cls_conn *conn;
2820 	struct nlmsghdr	*nlhstat;
2821 	struct iscsi_uevent *evstat;
2822 	struct iscsi_internal *priv;
2823 	int len = nlmsg_total_size(sizeof(*ev) +
2824 				   sizeof(struct iscsi_stats) +
2825 				   sizeof(struct iscsi_stats_custom) *
2826 				   ISCSI_STATS_CUSTOM_MAX);
2827 	int err = 0;
2828 
2829 	priv = iscsi_if_transport_lookup(transport);
2830 	if (!priv)
2831 		return -EINVAL;
2832 
2833 	conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2834 	if (!conn)
2835 		return -EEXIST;
2836 
2837 	do {
2838 		int actual_size;
2839 
2840 		skbstat = alloc_skb(len, GFP_ATOMIC);
2841 		if (!skbstat) {
2842 			iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2843 					      "deliver stats: OOM\n");
2844 			return -ENOMEM;
2845 		}
2846 
2847 		nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2848 				      (len - sizeof(*nlhstat)), 0);
2849 		evstat = nlmsg_data(nlhstat);
2850 		memset(evstat, 0, sizeof(*evstat));
2851 		evstat->transport_handle = iscsi_handle(conn->transport);
2852 		evstat->type = nlh->nlmsg_type;
2853 		evstat->u.get_stats.cid =
2854 			ev->u.get_stats.cid;
2855 		evstat->u.get_stats.sid =
2856 			ev->u.get_stats.sid;
2857 		stats = (struct iscsi_stats *)
2858 			((char*)evstat + sizeof(*evstat));
2859 		memset(stats, 0, sizeof(*stats));
2860 
2861 		transport->get_stats(conn, stats);
2862 		actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2863 					       sizeof(struct iscsi_stats) +
2864 					       sizeof(struct iscsi_stats_custom) *
2865 					       stats->custom_length);
2866 		actual_size -= sizeof(*nlhstat);
2867 		actual_size = nlmsg_msg_size(actual_size);
2868 		skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2869 		nlhstat->nlmsg_len = actual_size;
2870 
2871 		err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2872 					  GFP_ATOMIC);
2873 	} while (err < 0 && err != -ECONNREFUSED);
2874 
2875 	return err;
2876 }
2877 
2878 /**
2879  * iscsi_session_event - send session destr. completion event
2880  * @session: iscsi class session
2881  * @event: type of event
2882  */
iscsi_session_event(struct iscsi_cls_session * session,enum iscsi_uevent_e event)2883 int iscsi_session_event(struct iscsi_cls_session *session,
2884 			enum iscsi_uevent_e event)
2885 {
2886 	struct iscsi_internal *priv;
2887 	struct Scsi_Host *shost;
2888 	struct iscsi_uevent *ev;
2889 	struct sk_buff  *skb;
2890 	struct nlmsghdr *nlh;
2891 	int rc, len = nlmsg_total_size(sizeof(*ev));
2892 
2893 	priv = iscsi_if_transport_lookup(session->transport);
2894 	if (!priv)
2895 		return -EINVAL;
2896 	shost = iscsi_session_to_shost(session);
2897 
2898 	skb = alloc_skb(len, GFP_KERNEL);
2899 	if (!skb) {
2900 		iscsi_cls_session_printk(KERN_ERR, session,
2901 					 "Cannot notify userspace of session "
2902 					 "event %u\n", event);
2903 		return -ENOMEM;
2904 	}
2905 
2906 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2907 	ev = nlmsg_data(nlh);
2908 	ev->transport_handle = iscsi_handle(session->transport);
2909 
2910 	ev->type = event;
2911 	switch (event) {
2912 	case ISCSI_KEVENT_DESTROY_SESSION:
2913 		ev->r.d_session.host_no = shost->host_no;
2914 		ev->r.d_session.sid = session->sid;
2915 		break;
2916 	case ISCSI_KEVENT_CREATE_SESSION:
2917 		ev->r.c_session_ret.host_no = shost->host_no;
2918 		ev->r.c_session_ret.sid = session->sid;
2919 		break;
2920 	case ISCSI_KEVENT_UNBIND_SESSION:
2921 		ev->r.unbind_session.host_no = shost->host_no;
2922 		ev->r.unbind_session.sid = session->sid;
2923 		break;
2924 	default:
2925 		iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2926 					 "%u.\n", event);
2927 		kfree_skb(skb);
2928 		return -EINVAL;
2929 	}
2930 
2931 	/*
2932 	 * this will occur if the daemon is not up, so we just warn
2933 	 * the user and when the daemon is restarted it will handle it
2934 	 */
2935 	rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2936 	if (rc == -ESRCH)
2937 		iscsi_cls_session_printk(KERN_ERR, session,
2938 					 "Cannot notify userspace of session "
2939 					 "event %u. Check iscsi daemon\n",
2940 					 event);
2941 
2942 	ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2943 				event, rc);
2944 	return rc;
2945 }
2946 EXPORT_SYMBOL_GPL(iscsi_session_event);
2947 
2948 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)2949 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2950 			struct iscsi_uevent *ev, pid_t pid,
2951 			uint32_t initial_cmdsn,	uint16_t cmds_max,
2952 			uint16_t queue_depth)
2953 {
2954 	struct iscsi_transport *transport = priv->iscsi_transport;
2955 	struct iscsi_cls_session *session;
2956 	struct Scsi_Host *shost;
2957 
2958 	session = transport->create_session(ep, cmds_max, queue_depth,
2959 					    initial_cmdsn);
2960 	if (!session)
2961 		return -ENOMEM;
2962 
2963 	session->creator = pid;
2964 	shost = iscsi_session_to_shost(session);
2965 	ev->r.c_session_ret.host_no = shost->host_no;
2966 	ev->r.c_session_ret.sid = session->sid;
2967 	ISCSI_DBG_TRANS_SESSION(session,
2968 				"Completed creating transport session\n");
2969 	return 0;
2970 }
2971 
2972 static int
iscsi_if_create_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)2973 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2974 {
2975 	struct iscsi_cls_conn *conn;
2976 	struct iscsi_cls_session *session;
2977 
2978 	session = iscsi_session_lookup(ev->u.c_conn.sid);
2979 	if (!session) {
2980 		printk(KERN_ERR "iscsi: invalid session %d.\n",
2981 		       ev->u.c_conn.sid);
2982 		return -EINVAL;
2983 	}
2984 
2985 	conn = transport->create_conn(session, ev->u.c_conn.cid);
2986 	if (!conn) {
2987 		iscsi_cls_session_printk(KERN_ERR, session,
2988 					 "couldn't create a new connection.");
2989 		return -ENOMEM;
2990 	}
2991 
2992 	ev->r.c_conn_ret.sid = session->sid;
2993 	ev->r.c_conn_ret.cid = conn->cid;
2994 
2995 	ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2996 	return 0;
2997 }
2998 
2999 static int
iscsi_if_destroy_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)3000 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3001 {
3002 	struct iscsi_cls_conn *conn;
3003 
3004 	conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
3005 	if (!conn)
3006 		return -EINVAL;
3007 
3008 	ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
3009 	flush_work(&conn->cleanup_work);
3010 	ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
3011 
3012 	if (transport->destroy_conn)
3013 		transport->destroy_conn(conn);
3014 	return 0;
3015 }
3016 
3017 static int
iscsi_if_set_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3018 iscsi_if_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3019 {
3020 	char *data = (char*)ev + sizeof(*ev);
3021 	struct iscsi_cls_conn *conn;
3022 	struct iscsi_cls_session *session;
3023 	int err = 0, value = 0, state;
3024 
3025 	if (ev->u.set_param.len > rlen ||
3026 	    ev->u.set_param.len > PAGE_SIZE)
3027 		return -EINVAL;
3028 
3029 	session = iscsi_session_lookup(ev->u.set_param.sid);
3030 	conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
3031 	if (!conn || !session)
3032 		return -EINVAL;
3033 
3034 	/* data will be regarded as NULL-ended string, do length check */
3035 	if (strlen(data) > ev->u.set_param.len)
3036 		return -EINVAL;
3037 
3038 	switch (ev->u.set_param.param) {
3039 	case ISCSI_PARAM_SESS_RECOVERY_TMO:
3040 		sscanf(data, "%d", &value);
3041 		if (!session->recovery_tmo_sysfs_override)
3042 			session->recovery_tmo = value;
3043 		break;
3044 	default:
3045 		state = READ_ONCE(conn->state);
3046 		if (state == ISCSI_CONN_BOUND || state == ISCSI_CONN_UP) {
3047 			err = transport->set_param(conn, ev->u.set_param.param,
3048 					data, ev->u.set_param.len);
3049 		} else {
3050 			return -ENOTCONN;
3051 		}
3052 	}
3053 
3054 	return err;
3055 }
3056 
iscsi_if_ep_connect(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type)3057 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
3058 			       struct iscsi_uevent *ev, int msg_type)
3059 {
3060 	struct iscsi_endpoint *ep;
3061 	struct sockaddr *dst_addr;
3062 	struct Scsi_Host *shost = NULL;
3063 	int non_blocking, err = 0;
3064 
3065 	if (!transport->ep_connect)
3066 		return -EINVAL;
3067 
3068 	if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
3069 		shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
3070 		if (!shost) {
3071 			printk(KERN_ERR "ep connect failed. Could not find "
3072 			       "host no %u\n",
3073 			       ev->u.ep_connect_through_host.host_no);
3074 			return -ENODEV;
3075 		}
3076 		non_blocking = ev->u.ep_connect_through_host.non_blocking;
3077 	} else
3078 		non_blocking = ev->u.ep_connect.non_blocking;
3079 
3080 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3081 	ep = transport->ep_connect(shost, dst_addr, non_blocking);
3082 	if (IS_ERR(ep)) {
3083 		err = PTR_ERR(ep);
3084 		goto release_host;
3085 	}
3086 
3087 	ev->r.ep_connect_ret.handle = ep->id;
3088 release_host:
3089 	if (shost)
3090 		scsi_host_put(shost);
3091 	return err;
3092 }
3093 
iscsi_if_ep_disconnect(struct iscsi_transport * transport,u64 ep_handle)3094 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3095 				  u64 ep_handle)
3096 {
3097 	struct iscsi_cls_conn *conn;
3098 	struct iscsi_endpoint *ep;
3099 
3100 	if (!transport->ep_disconnect)
3101 		return -EINVAL;
3102 
3103 	ep = iscsi_lookup_endpoint(ep_handle);
3104 	if (!ep)
3105 		return -EINVAL;
3106 
3107 	conn = ep->conn;
3108 	if (!conn) {
3109 		/*
3110 		 * conn was not even bound yet, so we can't get iscsi conn
3111 		 * failures yet.
3112 		 */
3113 		transport->ep_disconnect(ep);
3114 		goto put_ep;
3115 	}
3116 
3117 	mutex_lock(&conn->ep_mutex);
3118 	iscsi_if_disconnect_bound_ep(conn, ep, false);
3119 	mutex_unlock(&conn->ep_mutex);
3120 put_ep:
3121 	iscsi_put_endpoint(ep);
3122 	return 0;
3123 }
3124 
3125 static int
iscsi_if_transport_ep(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type,u32 rlen)3126 iscsi_if_transport_ep(struct iscsi_transport *transport,
3127 		      struct iscsi_uevent *ev, int msg_type, u32 rlen)
3128 {
3129 	struct iscsi_endpoint *ep;
3130 	int rc = 0;
3131 
3132 	switch (msg_type) {
3133 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3134 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3135 		if (rlen < sizeof(struct sockaddr))
3136 			rc = -EINVAL;
3137 		else
3138 			rc = iscsi_if_ep_connect(transport, ev, msg_type);
3139 		break;
3140 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3141 		if (!transport->ep_poll)
3142 			return -EINVAL;
3143 
3144 		ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3145 		if (!ep)
3146 			return -EINVAL;
3147 
3148 		ev->r.retcode = transport->ep_poll(ep,
3149 						   ev->u.ep_poll.timeout_ms);
3150 		iscsi_put_endpoint(ep);
3151 		break;
3152 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3153 		rc = iscsi_if_ep_disconnect(transport,
3154 					    ev->u.ep_disconnect.ep_handle);
3155 		break;
3156 	}
3157 	return rc;
3158 }
3159 
3160 static int
iscsi_tgt_dscvr(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3161 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3162 		struct iscsi_uevent *ev, u32 rlen)
3163 {
3164 	struct Scsi_Host *shost;
3165 	struct sockaddr *dst_addr;
3166 	int err;
3167 
3168 	if (rlen < sizeof(*dst_addr))
3169 		return -EINVAL;
3170 
3171 	if (!transport->tgt_dscvr)
3172 		return -EINVAL;
3173 
3174 	shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3175 	if (!shost) {
3176 		printk(KERN_ERR "target discovery could not find host no %u\n",
3177 		       ev->u.tgt_dscvr.host_no);
3178 		return -ENODEV;
3179 	}
3180 
3181 
3182 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3183 	err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3184 				   ev->u.tgt_dscvr.enable, dst_addr);
3185 	scsi_host_put(shost);
3186 	return err;
3187 }
3188 
3189 static int
iscsi_set_host_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3190 iscsi_set_host_param(struct iscsi_transport *transport,
3191 		     struct iscsi_uevent *ev, u32 rlen)
3192 {
3193 	char *data = (char*)ev + sizeof(*ev);
3194 	struct Scsi_Host *shost;
3195 	int err;
3196 
3197 	if (!transport->set_host_param)
3198 		return -ENOSYS;
3199 
3200 	if (ev->u.set_host_param.len > rlen ||
3201 	    ev->u.set_host_param.len > PAGE_SIZE)
3202 		return -EINVAL;
3203 
3204 	shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3205 	if (!shost) {
3206 		printk(KERN_ERR "set_host_param could not find host no %u\n",
3207 		       ev->u.set_host_param.host_no);
3208 		return -ENODEV;
3209 	}
3210 
3211 	/* see similar check in iscsi_if_set_param() */
3212 	if (strlen(data) > ev->u.set_host_param.len)
3213 		return -EINVAL;
3214 
3215 	err = transport->set_host_param(shost, ev->u.set_host_param.param,
3216 					data, ev->u.set_host_param.len);
3217 	scsi_host_put(shost);
3218 	return err;
3219 }
3220 
3221 static int
iscsi_set_path(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3222 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3223 {
3224 	struct Scsi_Host *shost;
3225 	struct iscsi_path *params;
3226 	int err;
3227 
3228 	if (rlen < sizeof(*params))
3229 		return -EINVAL;
3230 
3231 	if (!transport->set_path)
3232 		return -ENOSYS;
3233 
3234 	shost = scsi_host_lookup(ev->u.set_path.host_no);
3235 	if (!shost) {
3236 		printk(KERN_ERR "set path could not find host no %u\n",
3237 		       ev->u.set_path.host_no);
3238 		return -ENODEV;
3239 	}
3240 
3241 	params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3242 	err = transport->set_path(shost, params);
3243 
3244 	scsi_host_put(shost);
3245 	return err;
3246 }
3247 
iscsi_session_has_conns(int sid)3248 static int iscsi_session_has_conns(int sid)
3249 {
3250 	struct iscsi_cls_conn *conn;
3251 	unsigned long flags;
3252 	int found = 0;
3253 
3254 	spin_lock_irqsave(&connlock, flags);
3255 	list_for_each_entry(conn, &connlist, conn_list) {
3256 		if (iscsi_conn_get_sid(conn) == sid) {
3257 			found = 1;
3258 			break;
3259 		}
3260 	}
3261 	spin_unlock_irqrestore(&connlock, flags);
3262 
3263 	return found;
3264 }
3265 
3266 static int
iscsi_set_iface_params(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3267 iscsi_set_iface_params(struct iscsi_transport *transport,
3268 		       struct iscsi_uevent *ev, uint32_t len)
3269 {
3270 	char *data = (char *)ev + sizeof(*ev);
3271 	struct Scsi_Host *shost;
3272 	int err;
3273 
3274 	if (!transport->set_iface_param)
3275 		return -ENOSYS;
3276 
3277 	shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3278 	if (!shost) {
3279 		printk(KERN_ERR "set_iface_params could not find host no %u\n",
3280 		       ev->u.set_iface_params.host_no);
3281 		return -ENODEV;
3282 	}
3283 
3284 	err = transport->set_iface_param(shost, data, len);
3285 	scsi_host_put(shost);
3286 	return err;
3287 }
3288 
3289 static int
iscsi_send_ping(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3290 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3291 {
3292 	struct Scsi_Host *shost;
3293 	struct sockaddr *dst_addr;
3294 	int err;
3295 
3296 	if (rlen < sizeof(*dst_addr))
3297 		return -EINVAL;
3298 
3299 	if (!transport->send_ping)
3300 		return -ENOSYS;
3301 
3302 	shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3303 	if (!shost) {
3304 		printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3305 		       ev->u.iscsi_ping.host_no);
3306 		return -ENODEV;
3307 	}
3308 
3309 	dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3310 	err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3311 				   ev->u.iscsi_ping.iface_type,
3312 				   ev->u.iscsi_ping.payload_size,
3313 				   ev->u.iscsi_ping.pid,
3314 				   dst_addr);
3315 	scsi_host_put(shost);
3316 	return err;
3317 }
3318 
3319 static int
iscsi_get_chap(struct iscsi_transport * transport,struct nlmsghdr * nlh)3320 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3321 {
3322 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3323 	struct Scsi_Host *shost = NULL;
3324 	struct iscsi_chap_rec *chap_rec;
3325 	struct iscsi_internal *priv;
3326 	struct sk_buff *skbchap;
3327 	struct nlmsghdr *nlhchap;
3328 	struct iscsi_uevent *evchap;
3329 	uint32_t chap_buf_size;
3330 	int len, err = 0;
3331 	char *buf;
3332 
3333 	if (!transport->get_chap)
3334 		return -EINVAL;
3335 
3336 	priv = iscsi_if_transport_lookup(transport);
3337 	if (!priv)
3338 		return -EINVAL;
3339 
3340 	chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3341 	len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3342 
3343 	shost = scsi_host_lookup(ev->u.get_chap.host_no);
3344 	if (!shost) {
3345 		printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3346 		       __func__, ev->u.get_chap.host_no);
3347 		return -ENODEV;
3348 	}
3349 
3350 	do {
3351 		int actual_size;
3352 
3353 		skbchap = alloc_skb(len, GFP_KERNEL);
3354 		if (!skbchap) {
3355 			printk(KERN_ERR "can not deliver chap: OOM\n");
3356 			err = -ENOMEM;
3357 			goto exit_get_chap;
3358 		}
3359 
3360 		nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3361 				      (len - sizeof(*nlhchap)), 0);
3362 		evchap = nlmsg_data(nlhchap);
3363 		memset(evchap, 0, sizeof(*evchap));
3364 		evchap->transport_handle = iscsi_handle(transport);
3365 		evchap->type = nlh->nlmsg_type;
3366 		evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3367 		evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3368 		evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3369 		buf = (char *)evchap + sizeof(*evchap);
3370 		memset(buf, 0, chap_buf_size);
3371 
3372 		err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3373 				    &evchap->u.get_chap.num_entries, buf);
3374 
3375 		actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3376 		skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3377 		nlhchap->nlmsg_len = actual_size;
3378 
3379 		err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3380 					  GFP_KERNEL);
3381 	} while (err < 0 && err != -ECONNREFUSED);
3382 
3383 exit_get_chap:
3384 	scsi_host_put(shost);
3385 	return err;
3386 }
3387 
iscsi_set_chap(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3388 static int iscsi_set_chap(struct iscsi_transport *transport,
3389 			  struct iscsi_uevent *ev, uint32_t len)
3390 {
3391 	char *data = (char *)ev + sizeof(*ev);
3392 	struct Scsi_Host *shost;
3393 	int err = 0;
3394 
3395 	if (!transport->set_chap)
3396 		return -ENOSYS;
3397 
3398 	shost = scsi_host_lookup(ev->u.set_path.host_no);
3399 	if (!shost) {
3400 		pr_err("%s could not find host no %u\n",
3401 		       __func__, ev->u.set_path.host_no);
3402 		return -ENODEV;
3403 	}
3404 
3405 	err = transport->set_chap(shost, data, len);
3406 	scsi_host_put(shost);
3407 	return err;
3408 }
3409 
iscsi_delete_chap(struct iscsi_transport * transport,struct iscsi_uevent * ev)3410 static int iscsi_delete_chap(struct iscsi_transport *transport,
3411 			     struct iscsi_uevent *ev)
3412 {
3413 	struct Scsi_Host *shost;
3414 	int err = 0;
3415 
3416 	if (!transport->delete_chap)
3417 		return -ENOSYS;
3418 
3419 	shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3420 	if (!shost) {
3421 		printk(KERN_ERR "%s could not find host no %u\n",
3422 		       __func__, ev->u.delete_chap.host_no);
3423 		return -ENODEV;
3424 	}
3425 
3426 	err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3427 	scsi_host_put(shost);
3428 	return err;
3429 }
3430 
3431 static const struct {
3432 	enum iscsi_discovery_parent_type value;
3433 	char				*name;
3434 } iscsi_discovery_parent_names[] = {
3435 	{ISCSI_DISC_PARENT_UNKNOWN,	"Unknown" },
3436 	{ISCSI_DISC_PARENT_SENDTGT,	"Sendtarget" },
3437 	{ISCSI_DISC_PARENT_ISNS,	"isns" },
3438 };
3439 
iscsi_get_discovery_parent_name(int parent_type)3440 char *iscsi_get_discovery_parent_name(int parent_type)
3441 {
3442 	int i;
3443 	char *state = "Unknown!";
3444 
3445 	for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3446 		if (iscsi_discovery_parent_names[i].value & parent_type) {
3447 			state = iscsi_discovery_parent_names[i].name;
3448 			break;
3449 		}
3450 	}
3451 	return state;
3452 }
3453 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3454 
iscsi_set_flashnode_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3455 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3456 				     struct iscsi_uevent *ev, uint32_t len)
3457 {
3458 	char *data = (char *)ev + sizeof(*ev);
3459 	struct Scsi_Host *shost;
3460 	struct iscsi_bus_flash_session *fnode_sess;
3461 	struct iscsi_bus_flash_conn *fnode_conn;
3462 	struct device *dev;
3463 	uint32_t idx;
3464 	int err = 0;
3465 
3466 	if (!transport->set_flashnode_param) {
3467 		err = -ENOSYS;
3468 		goto exit_set_fnode;
3469 	}
3470 
3471 	shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3472 	if (!shost) {
3473 		pr_err("%s could not find host no %u\n",
3474 		       __func__, ev->u.set_flashnode.host_no);
3475 		err = -ENODEV;
3476 		goto exit_set_fnode;
3477 	}
3478 
3479 	idx = ev->u.set_flashnode.flashnode_idx;
3480 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3481 	if (!fnode_sess) {
3482 		pr_err("%s could not find flashnode %u for host no %u\n",
3483 		       __func__, idx, ev->u.set_flashnode.host_no);
3484 		err = -ENODEV;
3485 		goto put_host;
3486 	}
3487 
3488 	dev = iscsi_find_flashnode_conn(fnode_sess);
3489 	if (!dev) {
3490 		err = -ENODEV;
3491 		goto put_sess;
3492 	}
3493 
3494 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3495 	err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3496 	put_device(dev);
3497 
3498 put_sess:
3499 	put_device(&fnode_sess->dev);
3500 
3501 put_host:
3502 	scsi_host_put(shost);
3503 
3504 exit_set_fnode:
3505 	return err;
3506 }
3507 
iscsi_new_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3508 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3509 			       struct iscsi_uevent *ev, uint32_t len)
3510 {
3511 	char *data = (char *)ev + sizeof(*ev);
3512 	struct Scsi_Host *shost;
3513 	int index;
3514 	int err = 0;
3515 
3516 	if (!transport->new_flashnode) {
3517 		err = -ENOSYS;
3518 		goto exit_new_fnode;
3519 	}
3520 
3521 	shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3522 	if (!shost) {
3523 		pr_err("%s could not find host no %u\n",
3524 		       __func__, ev->u.new_flashnode.host_no);
3525 		err = -ENODEV;
3526 		goto put_host;
3527 	}
3528 
3529 	index = transport->new_flashnode(shost, data, len);
3530 
3531 	if (index >= 0)
3532 		ev->r.new_flashnode_ret.flashnode_idx = index;
3533 	else
3534 		err = -EIO;
3535 
3536 put_host:
3537 	scsi_host_put(shost);
3538 
3539 exit_new_fnode:
3540 	return err;
3541 }
3542 
iscsi_del_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3543 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3544 			       struct iscsi_uevent *ev)
3545 {
3546 	struct Scsi_Host *shost;
3547 	struct iscsi_bus_flash_session *fnode_sess;
3548 	uint32_t idx;
3549 	int err = 0;
3550 
3551 	if (!transport->del_flashnode) {
3552 		err = -ENOSYS;
3553 		goto exit_del_fnode;
3554 	}
3555 
3556 	shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3557 	if (!shost) {
3558 		pr_err("%s could not find host no %u\n",
3559 		       __func__, ev->u.del_flashnode.host_no);
3560 		err = -ENODEV;
3561 		goto put_host;
3562 	}
3563 
3564 	idx = ev->u.del_flashnode.flashnode_idx;
3565 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3566 	if (!fnode_sess) {
3567 		pr_err("%s could not find flashnode %u for host no %u\n",
3568 		       __func__, idx, ev->u.del_flashnode.host_no);
3569 		err = -ENODEV;
3570 		goto put_host;
3571 	}
3572 
3573 	err = transport->del_flashnode(fnode_sess);
3574 	put_device(&fnode_sess->dev);
3575 
3576 put_host:
3577 	scsi_host_put(shost);
3578 
3579 exit_del_fnode:
3580 	return err;
3581 }
3582 
iscsi_login_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3583 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3584 				 struct iscsi_uevent *ev)
3585 {
3586 	struct Scsi_Host *shost;
3587 	struct iscsi_bus_flash_session *fnode_sess;
3588 	struct iscsi_bus_flash_conn *fnode_conn;
3589 	struct device *dev;
3590 	uint32_t idx;
3591 	int err = 0;
3592 
3593 	if (!transport->login_flashnode) {
3594 		err = -ENOSYS;
3595 		goto exit_login_fnode;
3596 	}
3597 
3598 	shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3599 	if (!shost) {
3600 		pr_err("%s could not find host no %u\n",
3601 		       __func__, ev->u.login_flashnode.host_no);
3602 		err = -ENODEV;
3603 		goto put_host;
3604 	}
3605 
3606 	idx = ev->u.login_flashnode.flashnode_idx;
3607 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3608 	if (!fnode_sess) {
3609 		pr_err("%s could not find flashnode %u for host no %u\n",
3610 		       __func__, idx, ev->u.login_flashnode.host_no);
3611 		err = -ENODEV;
3612 		goto put_host;
3613 	}
3614 
3615 	dev = iscsi_find_flashnode_conn(fnode_sess);
3616 	if (!dev) {
3617 		err = -ENODEV;
3618 		goto put_sess;
3619 	}
3620 
3621 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3622 	err = transport->login_flashnode(fnode_sess, fnode_conn);
3623 	put_device(dev);
3624 
3625 put_sess:
3626 	put_device(&fnode_sess->dev);
3627 
3628 put_host:
3629 	scsi_host_put(shost);
3630 
3631 exit_login_fnode:
3632 	return err;
3633 }
3634 
iscsi_logout_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3635 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3636 				  struct iscsi_uevent *ev)
3637 {
3638 	struct Scsi_Host *shost;
3639 	struct iscsi_bus_flash_session *fnode_sess;
3640 	struct iscsi_bus_flash_conn *fnode_conn;
3641 	struct device *dev;
3642 	uint32_t idx;
3643 	int err = 0;
3644 
3645 	if (!transport->logout_flashnode) {
3646 		err = -ENOSYS;
3647 		goto exit_logout_fnode;
3648 	}
3649 
3650 	shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3651 	if (!shost) {
3652 		pr_err("%s could not find host no %u\n",
3653 		       __func__, ev->u.logout_flashnode.host_no);
3654 		err = -ENODEV;
3655 		goto put_host;
3656 	}
3657 
3658 	idx = ev->u.logout_flashnode.flashnode_idx;
3659 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3660 	if (!fnode_sess) {
3661 		pr_err("%s could not find flashnode %u for host no %u\n",
3662 		       __func__, idx, ev->u.logout_flashnode.host_no);
3663 		err = -ENODEV;
3664 		goto put_host;
3665 	}
3666 
3667 	dev = iscsi_find_flashnode_conn(fnode_sess);
3668 	if (!dev) {
3669 		err = -ENODEV;
3670 		goto put_sess;
3671 	}
3672 
3673 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3674 
3675 	err = transport->logout_flashnode(fnode_sess, fnode_conn);
3676 	put_device(dev);
3677 
3678 put_sess:
3679 	put_device(&fnode_sess->dev);
3680 
3681 put_host:
3682 	scsi_host_put(shost);
3683 
3684 exit_logout_fnode:
3685 	return err;
3686 }
3687 
iscsi_logout_flashnode_sid(struct iscsi_transport * transport,struct iscsi_uevent * ev)3688 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3689 				      struct iscsi_uevent *ev)
3690 {
3691 	struct Scsi_Host *shost;
3692 	struct iscsi_cls_session *session;
3693 	int err = 0;
3694 
3695 	if (!transport->logout_flashnode_sid) {
3696 		err = -ENOSYS;
3697 		goto exit_logout_sid;
3698 	}
3699 
3700 	shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3701 	if (!shost) {
3702 		pr_err("%s could not find host no %u\n",
3703 		       __func__, ev->u.logout_flashnode.host_no);
3704 		err = -ENODEV;
3705 		goto put_host;
3706 	}
3707 
3708 	session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3709 	if (!session) {
3710 		pr_err("%s could not find session id %u\n",
3711 		       __func__, ev->u.logout_flashnode_sid.sid);
3712 		err = -EINVAL;
3713 		goto put_host;
3714 	}
3715 
3716 	err = transport->logout_flashnode_sid(session);
3717 
3718 put_host:
3719 	scsi_host_put(shost);
3720 
3721 exit_logout_sid:
3722 	return err;
3723 }
3724 
3725 static int
iscsi_get_host_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)3726 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3727 {
3728 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3729 	struct Scsi_Host *shost = NULL;
3730 	struct iscsi_internal *priv;
3731 	struct sk_buff *skbhost_stats;
3732 	struct nlmsghdr *nlhhost_stats;
3733 	struct iscsi_uevent *evhost_stats;
3734 	int host_stats_size = 0;
3735 	int len, err = 0;
3736 	char *buf;
3737 
3738 	if (!transport->get_host_stats)
3739 		return -ENOSYS;
3740 
3741 	priv = iscsi_if_transport_lookup(transport);
3742 	if (!priv)
3743 		return -EINVAL;
3744 
3745 	host_stats_size = sizeof(struct iscsi_offload_host_stats);
3746 	len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3747 
3748 	shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3749 	if (!shost) {
3750 		pr_err("%s: failed. Could not find host no %u\n",
3751 		       __func__, ev->u.get_host_stats.host_no);
3752 		return -ENODEV;
3753 	}
3754 
3755 	do {
3756 		int actual_size;
3757 
3758 		skbhost_stats = alloc_skb(len, GFP_KERNEL);
3759 		if (!skbhost_stats) {
3760 			pr_err("cannot deliver host stats: OOM\n");
3761 			err = -ENOMEM;
3762 			goto exit_host_stats;
3763 		}
3764 
3765 		nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3766 				      (len - sizeof(*nlhhost_stats)), 0);
3767 		evhost_stats = nlmsg_data(nlhhost_stats);
3768 		memset(evhost_stats, 0, sizeof(*evhost_stats));
3769 		evhost_stats->transport_handle = iscsi_handle(transport);
3770 		evhost_stats->type = nlh->nlmsg_type;
3771 		evhost_stats->u.get_host_stats.host_no =
3772 					ev->u.get_host_stats.host_no;
3773 		buf = (char *)evhost_stats + sizeof(*evhost_stats);
3774 		memset(buf, 0, host_stats_size);
3775 
3776 		err = transport->get_host_stats(shost, buf, host_stats_size);
3777 		if (err) {
3778 			kfree_skb(skbhost_stats);
3779 			goto exit_host_stats;
3780 		}
3781 
3782 		actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3783 		skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3784 		nlhhost_stats->nlmsg_len = actual_size;
3785 
3786 		err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3787 					  GFP_KERNEL);
3788 	} while (err < 0 && err != -ECONNREFUSED);
3789 
3790 exit_host_stats:
3791 	scsi_host_put(shost);
3792 	return err;
3793 }
3794 
iscsi_if_transport_conn(struct iscsi_transport * transport,struct nlmsghdr * nlh,u32 pdu_len)3795 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3796 				   struct nlmsghdr *nlh, u32 pdu_len)
3797 {
3798 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3799 	struct iscsi_cls_session *session;
3800 	struct iscsi_cls_conn *conn = NULL;
3801 	struct iscsi_endpoint *ep;
3802 	int err = 0;
3803 
3804 	switch (nlh->nlmsg_type) {
3805 	case ISCSI_UEVENT_CREATE_CONN:
3806 		return iscsi_if_create_conn(transport, ev);
3807 	case ISCSI_UEVENT_DESTROY_CONN:
3808 		return iscsi_if_destroy_conn(transport, ev);
3809 	case ISCSI_UEVENT_STOP_CONN:
3810 		conn = iscsi_conn_lookup(ev->u.stop_conn.sid,
3811 					 ev->u.stop_conn.cid);
3812 		if (!conn)
3813 			return -EINVAL;
3814 
3815 		return iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3816 	}
3817 
3818 	/*
3819 	 * The following cmds need to be run under the ep_mutex so in kernel
3820 	 * conn cleanup (ep_disconnect + unbind and conn) is not done while
3821 	 * these are running. They also must not run if we have just run a conn
3822 	 * cleanup because they would set the state in a way that might allow
3823 	 * IO or send IO themselves.
3824 	 */
3825 	switch (nlh->nlmsg_type) {
3826 	case ISCSI_UEVENT_START_CONN:
3827 		conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3828 					 ev->u.start_conn.cid);
3829 		break;
3830 	case ISCSI_UEVENT_BIND_CONN:
3831 		conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3832 		break;
3833 	case ISCSI_UEVENT_SEND_PDU:
3834 		conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3835 		break;
3836 	}
3837 
3838 	if (!conn)
3839 		return -EINVAL;
3840 
3841 	mutex_lock(&conn->ep_mutex);
3842 	spin_lock_irq(&conn->lock);
3843 	if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3844 		spin_unlock_irq(&conn->lock);
3845 		mutex_unlock(&conn->ep_mutex);
3846 		ev->r.retcode = -ENOTCONN;
3847 		return 0;
3848 	}
3849 	spin_unlock_irq(&conn->lock);
3850 
3851 	switch (nlh->nlmsg_type) {
3852 	case ISCSI_UEVENT_BIND_CONN:
3853 		session = iscsi_session_lookup(ev->u.b_conn.sid);
3854 		if (!session) {
3855 			err = -EINVAL;
3856 			break;
3857 		}
3858 
3859 		ev->r.retcode =	transport->bind_conn(session, conn,
3860 						ev->u.b_conn.transport_eph,
3861 						ev->u.b_conn.is_leading);
3862 		if (!ev->r.retcode)
3863 			WRITE_ONCE(conn->state, ISCSI_CONN_BOUND);
3864 
3865 		if (ev->r.retcode || !transport->ep_connect)
3866 			break;
3867 
3868 		ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3869 		if (ep) {
3870 			ep->conn = conn;
3871 			conn->ep = ep;
3872 			iscsi_put_endpoint(ep);
3873 		} else {
3874 			err = -ENOTCONN;
3875 			iscsi_cls_conn_printk(KERN_ERR, conn,
3876 					      "Could not set ep conn binding\n");
3877 		}
3878 		break;
3879 	case ISCSI_UEVENT_START_CONN:
3880 		ev->r.retcode = transport->start_conn(conn);
3881 		if (!ev->r.retcode)
3882 			WRITE_ONCE(conn->state, ISCSI_CONN_UP);
3883 
3884 		break;
3885 	case ISCSI_UEVENT_SEND_PDU:
3886 		if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3887 		    (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3888 			err = -EINVAL;
3889 			break;
3890 		}
3891 
3892 		ev->r.retcode =	transport->send_pdu(conn,
3893 				(struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3894 				(char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3895 				ev->u.send_pdu.data_size);
3896 		break;
3897 	default:
3898 		err = -ENOSYS;
3899 	}
3900 
3901 	mutex_unlock(&conn->ep_mutex);
3902 	return err;
3903 }
3904 
3905 static int
iscsi_if_recv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,uint32_t * group)3906 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3907 {
3908 	int err = 0;
3909 	u32 portid;
3910 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3911 	struct iscsi_transport *transport = NULL;
3912 	struct iscsi_internal *priv;
3913 	struct iscsi_cls_session *session;
3914 	struct iscsi_endpoint *ep = NULL;
3915 	u32 rlen;
3916 
3917 	if (!netlink_capable(skb, CAP_SYS_ADMIN))
3918 		return -EPERM;
3919 
3920 	if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3921 		*group = ISCSI_NL_GRP_UIP;
3922 	else
3923 		*group = ISCSI_NL_GRP_ISCSID;
3924 
3925 	priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3926 	if (!priv)
3927 		return -EINVAL;
3928 	transport = priv->iscsi_transport;
3929 
3930 	if (!try_module_get(transport->owner))
3931 		return -EINVAL;
3932 
3933 	portid = NETLINK_CB(skb).portid;
3934 
3935 	/*
3936 	 * Even though the remaining payload may not be regarded as nlattr,
3937 	 * (like address or something else), calculate the remaining length
3938 	 * here to ease following length checks.
3939 	 */
3940 	rlen = nlmsg_attrlen(nlh, sizeof(*ev));
3941 
3942 	switch (nlh->nlmsg_type) {
3943 	case ISCSI_UEVENT_CREATE_SESSION:
3944 		err = iscsi_if_create_session(priv, ep, ev,
3945 					      portid,
3946 					      ev->u.c_session.initial_cmdsn,
3947 					      ev->u.c_session.cmds_max,
3948 					      ev->u.c_session.queue_depth);
3949 		break;
3950 	case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3951 		ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3952 		if (!ep) {
3953 			err = -EINVAL;
3954 			break;
3955 		}
3956 
3957 		err = iscsi_if_create_session(priv, ep, ev,
3958 					portid,
3959 					ev->u.c_bound_session.initial_cmdsn,
3960 					ev->u.c_bound_session.cmds_max,
3961 					ev->u.c_bound_session.queue_depth);
3962 		iscsi_put_endpoint(ep);
3963 		break;
3964 	case ISCSI_UEVENT_DESTROY_SESSION:
3965 		session = iscsi_session_lookup(ev->u.d_session.sid);
3966 		if (!session)
3967 			err = -EINVAL;
3968 		else if (iscsi_session_has_conns(ev->u.d_session.sid))
3969 			err = -EBUSY;
3970 		else
3971 			transport->destroy_session(session);
3972 		break;
3973 	case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3974 		session = iscsi_session_lookup(ev->u.d_session.sid);
3975 		if (!session)
3976 			err = -EINVAL;
3977 		else if (iscsi_session_has_conns(ev->u.d_session.sid))
3978 			err = -EBUSY;
3979 		else {
3980 			unsigned long flags;
3981 
3982 			/* Prevent this session from being found again */
3983 			spin_lock_irqsave(&sesslock, flags);
3984 			list_del_init(&session->sess_list);
3985 			spin_unlock_irqrestore(&sesslock, flags);
3986 
3987 			queue_work(system_unbound_wq, &session->destroy_work);
3988 		}
3989 		break;
3990 	case ISCSI_UEVENT_UNBIND_SESSION:
3991 		session = iscsi_session_lookup(ev->u.d_session.sid);
3992 		if (session)
3993 			queue_work(session->workq, &session->unbind_work);
3994 		else
3995 			err = -EINVAL;
3996 		break;
3997 	case ISCSI_UEVENT_SET_PARAM:
3998 		err = iscsi_if_set_param(transport, ev, rlen);
3999 		break;
4000 	case ISCSI_UEVENT_CREATE_CONN:
4001 	case ISCSI_UEVENT_DESTROY_CONN:
4002 	case ISCSI_UEVENT_STOP_CONN:
4003 	case ISCSI_UEVENT_START_CONN:
4004 	case ISCSI_UEVENT_BIND_CONN:
4005 	case ISCSI_UEVENT_SEND_PDU:
4006 		err = iscsi_if_transport_conn(transport, nlh, rlen);
4007 		break;
4008 	case ISCSI_UEVENT_GET_STATS:
4009 		err = iscsi_if_get_stats(transport, nlh);
4010 		break;
4011 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
4012 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
4013 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
4014 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
4015 		err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type, rlen);
4016 		break;
4017 	case ISCSI_UEVENT_TGT_DSCVR:
4018 		err = iscsi_tgt_dscvr(transport, ev, rlen);
4019 		break;
4020 	case ISCSI_UEVENT_SET_HOST_PARAM:
4021 		err = iscsi_set_host_param(transport, ev, rlen);
4022 		break;
4023 	case ISCSI_UEVENT_PATH_UPDATE:
4024 		err = iscsi_set_path(transport, ev, rlen);
4025 		break;
4026 	case ISCSI_UEVENT_SET_IFACE_PARAMS:
4027 		err = iscsi_set_iface_params(transport, ev, rlen);
4028 		break;
4029 	case ISCSI_UEVENT_PING:
4030 		err = iscsi_send_ping(transport, ev, rlen);
4031 		break;
4032 	case ISCSI_UEVENT_GET_CHAP:
4033 		err = iscsi_get_chap(transport, nlh);
4034 		break;
4035 	case ISCSI_UEVENT_DELETE_CHAP:
4036 		err = iscsi_delete_chap(transport, ev);
4037 		break;
4038 	case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
4039 		err = iscsi_set_flashnode_param(transport, ev, rlen);
4040 		break;
4041 	case ISCSI_UEVENT_NEW_FLASHNODE:
4042 		err = iscsi_new_flashnode(transport, ev, rlen);
4043 		break;
4044 	case ISCSI_UEVENT_DEL_FLASHNODE:
4045 		err = iscsi_del_flashnode(transport, ev);
4046 		break;
4047 	case ISCSI_UEVENT_LOGIN_FLASHNODE:
4048 		err = iscsi_login_flashnode(transport, ev);
4049 		break;
4050 	case ISCSI_UEVENT_LOGOUT_FLASHNODE:
4051 		err = iscsi_logout_flashnode(transport, ev);
4052 		break;
4053 	case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
4054 		err = iscsi_logout_flashnode_sid(transport, ev);
4055 		break;
4056 	case ISCSI_UEVENT_SET_CHAP:
4057 		err = iscsi_set_chap(transport, ev, rlen);
4058 		break;
4059 	case ISCSI_UEVENT_GET_HOST_STATS:
4060 		err = iscsi_get_host_stats(transport, nlh);
4061 		break;
4062 	default:
4063 		err = -ENOSYS;
4064 		break;
4065 	}
4066 
4067 	module_put(transport->owner);
4068 	return err;
4069 }
4070 
4071 /*
4072  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
4073  * Malformed skbs with wrong lengths or invalid creds are not processed.
4074  */
4075 static void
iscsi_if_rx(struct sk_buff * skb)4076 iscsi_if_rx(struct sk_buff *skb)
4077 {
4078 	u32 portid = NETLINK_CB(skb).portid;
4079 
4080 	mutex_lock(&rx_queue_mutex);
4081 	while (skb->len >= NLMSG_HDRLEN) {
4082 		int err;
4083 		uint32_t rlen;
4084 		struct nlmsghdr	*nlh;
4085 		struct iscsi_uevent *ev;
4086 		uint32_t group;
4087 		int retries = ISCSI_SEND_MAX_ALLOWED;
4088 
4089 		nlh = nlmsg_hdr(skb);
4090 		if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
4091 		    skb->len < nlh->nlmsg_len) {
4092 			break;
4093 		}
4094 
4095 		ev = nlmsg_data(nlh);
4096 		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4097 		if (rlen > skb->len)
4098 			rlen = skb->len;
4099 
4100 		err = iscsi_if_recv_msg(skb, nlh, &group);
4101 		if (err) {
4102 			ev->type = ISCSI_KEVENT_IF_ERROR;
4103 			ev->iferror = err;
4104 		}
4105 		do {
4106 			/*
4107 			 * special case for GET_STATS:
4108 			 * on success - sending reply and stats from
4109 			 * inside of if_recv_msg(),
4110 			 * on error - fall through.
4111 			 */
4112 			if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4113 				break;
4114 			if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4115 				break;
4116 			err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4117 						  ev, sizeof(*ev));
4118 			if (err == -EAGAIN && --retries < 0) {
4119 				printk(KERN_WARNING "Send reply failed, error %d\n", err);
4120 				break;
4121 			}
4122 		} while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4123 		skb_pull(skb, rlen);
4124 	}
4125 	mutex_unlock(&rx_queue_mutex);
4126 }
4127 
4128 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)		\
4129 struct device_attribute dev_attr_##_prefix##_##_name =	\
4130 	__ATTR(_name,_mode,_show,_store)
4131 
4132 /*
4133  * iSCSI connection attrs
4134  */
4135 #define iscsi_conn_attr_show(param)					\
4136 static ssize_t								\
4137 show_conn_param_##param(struct device *dev, 				\
4138 			struct device_attribute *attr, char *buf)	\
4139 {									\
4140 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
4141 	struct iscsi_transport *t = conn->transport;			\
4142 	return t->get_conn_param(conn, param, buf);			\
4143 }
4144 
4145 #define iscsi_conn_attr(field, param)					\
4146 	iscsi_conn_attr_show(param)					\
4147 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,	\
4148 			NULL);
4149 
4150 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4151 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4152 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4153 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4154 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4155 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4156 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4157 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4158 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4159 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4160 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4161 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4162 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4163 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4164 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4165 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4166 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4167 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4168 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4169 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4170 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4171 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4172 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4173 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4174 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4175 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4176 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4177 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4178 
4179 static const char *const connection_state_names[] = {
4180 	[ISCSI_CONN_UP] = "up",
4181 	[ISCSI_CONN_DOWN] = "down",
4182 	[ISCSI_CONN_FAILED] = "failed",
4183 	[ISCSI_CONN_BOUND] = "bound"
4184 };
4185 
show_conn_state(struct device * dev,struct device_attribute * attr,char * buf)4186 static ssize_t show_conn_state(struct device *dev,
4187 			       struct device_attribute *attr, char *buf)
4188 {
4189 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4190 	const char *state = "unknown";
4191 	int conn_state = READ_ONCE(conn->state);
4192 
4193 	if (conn_state >= 0 &&
4194 	    conn_state < ARRAY_SIZE(connection_state_names))
4195 		state = connection_state_names[conn_state];
4196 
4197 	return sysfs_emit(buf, "%s\n", state);
4198 }
4199 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4200 			NULL);
4201 
4202 #define iscsi_conn_ep_attr_show(param)					\
4203 static ssize_t show_conn_ep_param_##param(struct device *dev,		\
4204 					  struct device_attribute *attr,\
4205 					  char *buf)			\
4206 {									\
4207 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
4208 	struct iscsi_transport *t = conn->transport;			\
4209 	struct iscsi_endpoint *ep;					\
4210 	ssize_t rc;							\
4211 									\
4212 	/*								\
4213 	 * Need to make sure ep_disconnect does not free the LLD's	\
4214 	 * interconnect resources while we are trying to read them.	\
4215 	 */								\
4216 	mutex_lock(&conn->ep_mutex);					\
4217 	ep = conn->ep;							\
4218 	if (!ep && t->ep_connect) {					\
4219 		mutex_unlock(&conn->ep_mutex);				\
4220 		return -ENOTCONN;					\
4221 	}								\
4222 									\
4223 	if (ep)								\
4224 		rc = t->get_ep_param(ep, param, buf);			\
4225 	else								\
4226 		rc = t->get_conn_param(conn, param, buf);		\
4227 	mutex_unlock(&conn->ep_mutex);					\
4228 	return rc;							\
4229 }
4230 
4231 #define iscsi_conn_ep_attr(field, param)				\
4232 	iscsi_conn_ep_attr_show(param)					\
4233 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,				\
4234 			show_conn_ep_param_##param, NULL);
4235 
4236 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4237 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4238 
4239 static struct attribute *iscsi_conn_attrs[] = {
4240 	&dev_attr_conn_max_recv_dlength.attr,
4241 	&dev_attr_conn_max_xmit_dlength.attr,
4242 	&dev_attr_conn_header_digest.attr,
4243 	&dev_attr_conn_data_digest.attr,
4244 	&dev_attr_conn_ifmarker.attr,
4245 	&dev_attr_conn_ofmarker.attr,
4246 	&dev_attr_conn_address.attr,
4247 	&dev_attr_conn_port.attr,
4248 	&dev_attr_conn_exp_statsn.attr,
4249 	&dev_attr_conn_persistent_address.attr,
4250 	&dev_attr_conn_persistent_port.attr,
4251 	&dev_attr_conn_ping_tmo.attr,
4252 	&dev_attr_conn_recv_tmo.attr,
4253 	&dev_attr_conn_local_port.attr,
4254 	&dev_attr_conn_statsn.attr,
4255 	&dev_attr_conn_keepalive_tmo.attr,
4256 	&dev_attr_conn_max_segment_size.attr,
4257 	&dev_attr_conn_tcp_timestamp_stat.attr,
4258 	&dev_attr_conn_tcp_wsf_disable.attr,
4259 	&dev_attr_conn_tcp_nagle_disable.attr,
4260 	&dev_attr_conn_tcp_timer_scale.attr,
4261 	&dev_attr_conn_tcp_timestamp_enable.attr,
4262 	&dev_attr_conn_fragment_disable.attr,
4263 	&dev_attr_conn_ipv4_tos.attr,
4264 	&dev_attr_conn_ipv6_traffic_class.attr,
4265 	&dev_attr_conn_ipv6_flow_label.attr,
4266 	&dev_attr_conn_is_fw_assigned_ipv6.attr,
4267 	&dev_attr_conn_tcp_xmit_wsf.attr,
4268 	&dev_attr_conn_tcp_recv_wsf.attr,
4269 	&dev_attr_conn_local_ipaddr.attr,
4270 	&dev_attr_conn_state.attr,
4271 	NULL,
4272 };
4273 
iscsi_conn_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4274 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4275 					 struct attribute *attr, int i)
4276 {
4277 	struct device *cdev = container_of(kobj, struct device, kobj);
4278 	struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4279 	struct iscsi_transport *t = conn->transport;
4280 	int param;
4281 
4282 	if (attr == &dev_attr_conn_max_recv_dlength.attr)
4283 		param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4284 	else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4285 		param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4286 	else if (attr == &dev_attr_conn_header_digest.attr)
4287 		param = ISCSI_PARAM_HDRDGST_EN;
4288 	else if (attr == &dev_attr_conn_data_digest.attr)
4289 		param = ISCSI_PARAM_DATADGST_EN;
4290 	else if (attr == &dev_attr_conn_ifmarker.attr)
4291 		param = ISCSI_PARAM_IFMARKER_EN;
4292 	else if (attr == &dev_attr_conn_ofmarker.attr)
4293 		param = ISCSI_PARAM_OFMARKER_EN;
4294 	else if (attr == &dev_attr_conn_address.attr)
4295 		param = ISCSI_PARAM_CONN_ADDRESS;
4296 	else if (attr == &dev_attr_conn_port.attr)
4297 		param = ISCSI_PARAM_CONN_PORT;
4298 	else if (attr == &dev_attr_conn_exp_statsn.attr)
4299 		param = ISCSI_PARAM_EXP_STATSN;
4300 	else if (attr == &dev_attr_conn_persistent_address.attr)
4301 		param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4302 	else if (attr == &dev_attr_conn_persistent_port.attr)
4303 		param = ISCSI_PARAM_PERSISTENT_PORT;
4304 	else if (attr == &dev_attr_conn_ping_tmo.attr)
4305 		param = ISCSI_PARAM_PING_TMO;
4306 	else if (attr == &dev_attr_conn_recv_tmo.attr)
4307 		param = ISCSI_PARAM_RECV_TMO;
4308 	else if (attr == &dev_attr_conn_local_port.attr)
4309 		param = ISCSI_PARAM_LOCAL_PORT;
4310 	else if (attr == &dev_attr_conn_statsn.attr)
4311 		param = ISCSI_PARAM_STATSN;
4312 	else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4313 		param = ISCSI_PARAM_KEEPALIVE_TMO;
4314 	else if (attr == &dev_attr_conn_max_segment_size.attr)
4315 		param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4316 	else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4317 		param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4318 	else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4319 		param = ISCSI_PARAM_TCP_WSF_DISABLE;
4320 	else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4321 		param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4322 	else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4323 		param = ISCSI_PARAM_TCP_TIMER_SCALE;
4324 	else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4325 		param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4326 	else if (attr == &dev_attr_conn_fragment_disable.attr)
4327 		param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4328 	else if (attr == &dev_attr_conn_ipv4_tos.attr)
4329 		param = ISCSI_PARAM_IPV4_TOS;
4330 	else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4331 		param = ISCSI_PARAM_IPV6_TC;
4332 	else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4333 		param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4334 	else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4335 		param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4336 	else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4337 		param = ISCSI_PARAM_TCP_XMIT_WSF;
4338 	else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4339 		param = ISCSI_PARAM_TCP_RECV_WSF;
4340 	else if (attr == &dev_attr_conn_local_ipaddr.attr)
4341 		param = ISCSI_PARAM_LOCAL_IPADDR;
4342 	else if (attr == &dev_attr_conn_state.attr)
4343 		return S_IRUGO;
4344 	else {
4345 		WARN_ONCE(1, "Invalid conn attr");
4346 		return 0;
4347 	}
4348 
4349 	return t->attr_is_visible(ISCSI_PARAM, param);
4350 }
4351 
4352 static struct attribute_group iscsi_conn_group = {
4353 	.attrs = iscsi_conn_attrs,
4354 	.is_visible = iscsi_conn_attr_is_visible,
4355 };
4356 
4357 /*
4358  * iSCSI session attrs
4359  */
4360 #define iscsi_session_attr_show(param, perm)				\
4361 static ssize_t								\
4362 show_session_param_##param(struct device *dev,				\
4363 			   struct device_attribute *attr, char *buf)	\
4364 {									\
4365 	struct iscsi_cls_session *session = 				\
4366 		iscsi_dev_to_session(dev->parent);			\
4367 	struct iscsi_transport *t = session->transport;			\
4368 									\
4369 	if (perm && !capable(CAP_SYS_ADMIN))				\
4370 		return -EACCES;						\
4371 	return t->get_session_param(session, param, buf);		\
4372 }
4373 
4374 #define iscsi_session_attr(field, param, perm)				\
4375 	iscsi_session_attr_show(param, perm)				\
4376 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4377 			NULL);
4378 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4379 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4380 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4381 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4382 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4383 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4384 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4385 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4386 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4387 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4388 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4389 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4390 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4391 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4392 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4393 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4394 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4395 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4396 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4397 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4398 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4399 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4400 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4401 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4402 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4403 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4404 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4405 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4406 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4407 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4408 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4409 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4410 iscsi_session_attr(discovery_auth_optional,
4411 		   ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4412 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4413 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4414 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4415 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4416 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4417 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4418 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4419 
4420 static ssize_t
show_priv_session_target_state(struct device * dev,struct device_attribute * attr,char * buf)4421 show_priv_session_target_state(struct device *dev, struct device_attribute *attr,
4422 			char *buf)
4423 {
4424 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4425 
4426 	return sysfs_emit(buf, "%s\n",
4427 			iscsi_session_target_state_name[session->target_state]);
4428 }
4429 
4430 static ISCSI_CLASS_ATTR(priv_sess, target_state, S_IRUGO,
4431 			show_priv_session_target_state, NULL);
4432 
4433 static ssize_t
show_priv_session_state(struct device * dev,struct device_attribute * attr,char * buf)4434 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4435 			char *buf)
4436 {
4437 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4438 	return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4439 }
4440 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4441 			NULL);
4442 static ssize_t
show_priv_session_creator(struct device * dev,struct device_attribute * attr,char * buf)4443 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4444 			char *buf)
4445 {
4446 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4447 	return sysfs_emit(buf, "%d\n", session->creator);
4448 }
4449 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4450 			NULL);
4451 static ssize_t
show_priv_session_target_id(struct device * dev,struct device_attribute * attr,char * buf)4452 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4453 			    char *buf)
4454 {
4455 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4456 	return sysfs_emit(buf, "%d\n", session->target_id);
4457 }
4458 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4459 			show_priv_session_target_id, NULL);
4460 
4461 #define iscsi_priv_session_attr_show(field, format)			\
4462 static ssize_t								\
4463 show_priv_session_##field(struct device *dev, 				\
4464 			  struct device_attribute *attr, char *buf)	\
4465 {									\
4466 	struct iscsi_cls_session *session = 				\
4467 			iscsi_dev_to_session(dev->parent);		\
4468 	if (session->field == -1)					\
4469 		return sysfs_emit(buf, "off\n");			\
4470 	return sysfs_emit(buf, format"\n", session->field);		\
4471 }
4472 
4473 #define iscsi_priv_session_attr_store(field)				\
4474 static ssize_t								\
4475 store_priv_session_##field(struct device *dev,				\
4476 			   struct device_attribute *attr,		\
4477 			   const char *buf, size_t count)		\
4478 {									\
4479 	int val;							\
4480 	char *cp;							\
4481 	struct iscsi_cls_session *session =				\
4482 		iscsi_dev_to_session(dev->parent);			\
4483 	if ((session->state == ISCSI_SESSION_FREE) ||			\
4484 	    (session->state == ISCSI_SESSION_FAILED))			\
4485 		return -EBUSY;						\
4486 	if (strncmp(buf, "off", 3) == 0) {				\
4487 		session->field = -1;					\
4488 		session->field##_sysfs_override = true;			\
4489 	} else {							\
4490 		val = simple_strtoul(buf, &cp, 0);			\
4491 		if (*cp != '\0' && *cp != '\n')				\
4492 			return -EINVAL;					\
4493 		session->field = val;					\
4494 		session->field##_sysfs_override = true;			\
4495 	}								\
4496 	return count;							\
4497 }
4498 
4499 #define iscsi_priv_session_rw_attr(field, format)			\
4500 	iscsi_priv_session_attr_show(field, format)			\
4501 	iscsi_priv_session_attr_store(field)				\
4502 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,		\
4503 			show_priv_session_##field,			\
4504 			store_priv_session_##field)
4505 
4506 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4507 
4508 static struct attribute *iscsi_session_attrs[] = {
4509 	&dev_attr_sess_initial_r2t.attr,
4510 	&dev_attr_sess_max_outstanding_r2t.attr,
4511 	&dev_attr_sess_immediate_data.attr,
4512 	&dev_attr_sess_first_burst_len.attr,
4513 	&dev_attr_sess_max_burst_len.attr,
4514 	&dev_attr_sess_data_pdu_in_order.attr,
4515 	&dev_attr_sess_data_seq_in_order.attr,
4516 	&dev_attr_sess_erl.attr,
4517 	&dev_attr_sess_targetname.attr,
4518 	&dev_attr_sess_tpgt.attr,
4519 	&dev_attr_sess_password.attr,
4520 	&dev_attr_sess_password_in.attr,
4521 	&dev_attr_sess_username.attr,
4522 	&dev_attr_sess_username_in.attr,
4523 	&dev_attr_sess_fast_abort.attr,
4524 	&dev_attr_sess_abort_tmo.attr,
4525 	&dev_attr_sess_lu_reset_tmo.attr,
4526 	&dev_attr_sess_tgt_reset_tmo.attr,
4527 	&dev_attr_sess_ifacename.attr,
4528 	&dev_attr_sess_initiatorname.attr,
4529 	&dev_attr_sess_targetalias.attr,
4530 	&dev_attr_sess_boot_root.attr,
4531 	&dev_attr_sess_boot_nic.attr,
4532 	&dev_attr_sess_boot_target.attr,
4533 	&dev_attr_priv_sess_recovery_tmo.attr,
4534 	&dev_attr_priv_sess_state.attr,
4535 	&dev_attr_priv_sess_target_state.attr,
4536 	&dev_attr_priv_sess_creator.attr,
4537 	&dev_attr_sess_chap_out_idx.attr,
4538 	&dev_attr_sess_chap_in_idx.attr,
4539 	&dev_attr_priv_sess_target_id.attr,
4540 	&dev_attr_sess_auto_snd_tgt_disable.attr,
4541 	&dev_attr_sess_discovery_session.attr,
4542 	&dev_attr_sess_portal_type.attr,
4543 	&dev_attr_sess_chap_auth.attr,
4544 	&dev_attr_sess_discovery_logout.attr,
4545 	&dev_attr_sess_bidi_chap.attr,
4546 	&dev_attr_sess_discovery_auth_optional.attr,
4547 	&dev_attr_sess_def_time2wait.attr,
4548 	&dev_attr_sess_def_time2retain.attr,
4549 	&dev_attr_sess_isid.attr,
4550 	&dev_attr_sess_tsid.attr,
4551 	&dev_attr_sess_def_taskmgmt_tmo.attr,
4552 	&dev_attr_sess_discovery_parent_idx.attr,
4553 	&dev_attr_sess_discovery_parent_type.attr,
4554 	NULL,
4555 };
4556 
iscsi_session_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4557 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4558 					    struct attribute *attr, int i)
4559 {
4560 	struct device *cdev = container_of(kobj, struct device, kobj);
4561 	struct iscsi_cls_session *session = transport_class_to_session(cdev);
4562 	struct iscsi_transport *t = session->transport;
4563 	int param;
4564 
4565 	if (attr == &dev_attr_sess_initial_r2t.attr)
4566 		param = ISCSI_PARAM_INITIAL_R2T_EN;
4567 	else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4568 		param = ISCSI_PARAM_MAX_R2T;
4569 	else if (attr == &dev_attr_sess_immediate_data.attr)
4570 		param = ISCSI_PARAM_IMM_DATA_EN;
4571 	else if (attr == &dev_attr_sess_first_burst_len.attr)
4572 		param = ISCSI_PARAM_FIRST_BURST;
4573 	else if (attr == &dev_attr_sess_max_burst_len.attr)
4574 		param = ISCSI_PARAM_MAX_BURST;
4575 	else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4576 		param = ISCSI_PARAM_PDU_INORDER_EN;
4577 	else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4578 		param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4579 	else if (attr == &dev_attr_sess_erl.attr)
4580 		param = ISCSI_PARAM_ERL;
4581 	else if (attr == &dev_attr_sess_targetname.attr)
4582 		param = ISCSI_PARAM_TARGET_NAME;
4583 	else if (attr == &dev_attr_sess_tpgt.attr)
4584 		param = ISCSI_PARAM_TPGT;
4585 	else if (attr == &dev_attr_sess_chap_in_idx.attr)
4586 		param = ISCSI_PARAM_CHAP_IN_IDX;
4587 	else if (attr == &dev_attr_sess_chap_out_idx.attr)
4588 		param = ISCSI_PARAM_CHAP_OUT_IDX;
4589 	else if (attr == &dev_attr_sess_password.attr)
4590 		param = ISCSI_PARAM_USERNAME;
4591 	else if (attr == &dev_attr_sess_password_in.attr)
4592 		param = ISCSI_PARAM_USERNAME_IN;
4593 	else if (attr == &dev_attr_sess_username.attr)
4594 		param = ISCSI_PARAM_PASSWORD;
4595 	else if (attr == &dev_attr_sess_username_in.attr)
4596 		param = ISCSI_PARAM_PASSWORD_IN;
4597 	else if (attr == &dev_attr_sess_fast_abort.attr)
4598 		param = ISCSI_PARAM_FAST_ABORT;
4599 	else if (attr == &dev_attr_sess_abort_tmo.attr)
4600 		param = ISCSI_PARAM_ABORT_TMO;
4601 	else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4602 		param = ISCSI_PARAM_LU_RESET_TMO;
4603 	else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4604 		param = ISCSI_PARAM_TGT_RESET_TMO;
4605 	else if (attr == &dev_attr_sess_ifacename.attr)
4606 		param = ISCSI_PARAM_IFACE_NAME;
4607 	else if (attr == &dev_attr_sess_initiatorname.attr)
4608 		param = ISCSI_PARAM_INITIATOR_NAME;
4609 	else if (attr == &dev_attr_sess_targetalias.attr)
4610 		param = ISCSI_PARAM_TARGET_ALIAS;
4611 	else if (attr == &dev_attr_sess_boot_root.attr)
4612 		param = ISCSI_PARAM_BOOT_ROOT;
4613 	else if (attr == &dev_attr_sess_boot_nic.attr)
4614 		param = ISCSI_PARAM_BOOT_NIC;
4615 	else if (attr == &dev_attr_sess_boot_target.attr)
4616 		param = ISCSI_PARAM_BOOT_TARGET;
4617 	else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4618 		param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4619 	else if (attr == &dev_attr_sess_discovery_session.attr)
4620 		param = ISCSI_PARAM_DISCOVERY_SESS;
4621 	else if (attr == &dev_attr_sess_portal_type.attr)
4622 		param = ISCSI_PARAM_PORTAL_TYPE;
4623 	else if (attr == &dev_attr_sess_chap_auth.attr)
4624 		param = ISCSI_PARAM_CHAP_AUTH_EN;
4625 	else if (attr == &dev_attr_sess_discovery_logout.attr)
4626 		param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4627 	else if (attr == &dev_attr_sess_bidi_chap.attr)
4628 		param = ISCSI_PARAM_BIDI_CHAP_EN;
4629 	else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4630 		param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4631 	else if (attr == &dev_attr_sess_def_time2wait.attr)
4632 		param = ISCSI_PARAM_DEF_TIME2WAIT;
4633 	else if (attr == &dev_attr_sess_def_time2retain.attr)
4634 		param = ISCSI_PARAM_DEF_TIME2RETAIN;
4635 	else if (attr == &dev_attr_sess_isid.attr)
4636 		param = ISCSI_PARAM_ISID;
4637 	else if (attr == &dev_attr_sess_tsid.attr)
4638 		param = ISCSI_PARAM_TSID;
4639 	else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4640 		param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4641 	else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4642 		param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4643 	else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4644 		param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4645 	else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4646 		return S_IRUGO | S_IWUSR;
4647 	else if (attr == &dev_attr_priv_sess_state.attr)
4648 		return S_IRUGO;
4649 	else if (attr == &dev_attr_priv_sess_target_state.attr)
4650 		return S_IRUGO;
4651 	else if (attr == &dev_attr_priv_sess_creator.attr)
4652 		return S_IRUGO;
4653 	else if (attr == &dev_attr_priv_sess_target_id.attr)
4654 		return S_IRUGO;
4655 	else {
4656 		WARN_ONCE(1, "Invalid session attr");
4657 		return 0;
4658 	}
4659 
4660 	return t->attr_is_visible(ISCSI_PARAM, param);
4661 }
4662 
4663 static struct attribute_group iscsi_session_group = {
4664 	.attrs = iscsi_session_attrs,
4665 	.is_visible = iscsi_session_attr_is_visible,
4666 };
4667 
4668 /*
4669  * iSCSI host attrs
4670  */
4671 #define iscsi_host_attr_show(param)					\
4672 static ssize_t								\
4673 show_host_param_##param(struct device *dev, 				\
4674 			struct device_attribute *attr, char *buf)	\
4675 {									\
4676 	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
4677 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4678 	return priv->iscsi_transport->get_host_param(shost, param, buf); \
4679 }
4680 
4681 #define iscsi_host_attr(field, param)					\
4682 	iscsi_host_attr_show(param)					\
4683 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,	\
4684 			NULL);
4685 
4686 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4687 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4688 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4689 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4690 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4691 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4692 
4693 static struct attribute *iscsi_host_attrs[] = {
4694 	&dev_attr_host_netdev.attr,
4695 	&dev_attr_host_hwaddress.attr,
4696 	&dev_attr_host_ipaddress.attr,
4697 	&dev_attr_host_initiatorname.attr,
4698 	&dev_attr_host_port_state.attr,
4699 	&dev_attr_host_port_speed.attr,
4700 	NULL,
4701 };
4702 
iscsi_host_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4703 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4704 					 struct attribute *attr, int i)
4705 {
4706 	struct device *cdev = container_of(kobj, struct device, kobj);
4707 	struct Scsi_Host *shost = transport_class_to_shost(cdev);
4708 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4709 	int param;
4710 
4711 	if (attr == &dev_attr_host_netdev.attr)
4712 		param = ISCSI_HOST_PARAM_NETDEV_NAME;
4713 	else if (attr == &dev_attr_host_hwaddress.attr)
4714 		param = ISCSI_HOST_PARAM_HWADDRESS;
4715 	else if (attr == &dev_attr_host_ipaddress.attr)
4716 		param = ISCSI_HOST_PARAM_IPADDRESS;
4717 	else if (attr == &dev_attr_host_initiatorname.attr)
4718 		param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4719 	else if (attr == &dev_attr_host_port_state.attr)
4720 		param = ISCSI_HOST_PARAM_PORT_STATE;
4721 	else if (attr == &dev_attr_host_port_speed.attr)
4722 		param = ISCSI_HOST_PARAM_PORT_SPEED;
4723 	else {
4724 		WARN_ONCE(1, "Invalid host attr");
4725 		return 0;
4726 	}
4727 
4728 	return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4729 }
4730 
4731 static struct attribute_group iscsi_host_group = {
4732 	.attrs = iscsi_host_attrs,
4733 	.is_visible = iscsi_host_attr_is_visible,
4734 };
4735 
4736 /* convert iscsi_port_speed values to ascii string name */
4737 static const struct {
4738 	enum iscsi_port_speed	value;
4739 	char			*name;
4740 } iscsi_port_speed_names[] = {
4741 	{ISCSI_PORT_SPEED_UNKNOWN,	"Unknown" },
4742 	{ISCSI_PORT_SPEED_10MBPS,	"10 Mbps" },
4743 	{ISCSI_PORT_SPEED_100MBPS,	"100 Mbps" },
4744 	{ISCSI_PORT_SPEED_1GBPS,	"1 Gbps" },
4745 	{ISCSI_PORT_SPEED_10GBPS,	"10 Gbps" },
4746 	{ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4747 	{ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4748 };
4749 
iscsi_get_port_speed_name(struct Scsi_Host * shost)4750 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4751 {
4752 	int i;
4753 	char *speed = "Unknown!";
4754 	struct iscsi_cls_host *ihost = shost->shost_data;
4755 	uint32_t port_speed = ihost->port_speed;
4756 
4757 	for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4758 		if (iscsi_port_speed_names[i].value & port_speed) {
4759 			speed = iscsi_port_speed_names[i].name;
4760 			break;
4761 		}
4762 	}
4763 	return speed;
4764 }
4765 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4766 
4767 /* convert iscsi_port_state values to ascii string name */
4768 static const struct {
4769 	enum iscsi_port_state	value;
4770 	char			*name;
4771 } iscsi_port_state_names[] = {
4772 	{ISCSI_PORT_STATE_DOWN,		"LINK DOWN" },
4773 	{ISCSI_PORT_STATE_UP,		"LINK UP" },
4774 };
4775 
iscsi_get_port_state_name(struct Scsi_Host * shost)4776 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4777 {
4778 	int i;
4779 	char *state = "Unknown!";
4780 	struct iscsi_cls_host *ihost = shost->shost_data;
4781 	uint32_t port_state = ihost->port_state;
4782 
4783 	for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4784 		if (iscsi_port_state_names[i].value & port_state) {
4785 			state = iscsi_port_state_names[i].name;
4786 			break;
4787 		}
4788 	}
4789 	return state;
4790 }
4791 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4792 
iscsi_session_match(struct attribute_container * cont,struct device * dev)4793 static int iscsi_session_match(struct attribute_container *cont,
4794 			   struct device *dev)
4795 {
4796 	struct iscsi_cls_session *session;
4797 	struct Scsi_Host *shost;
4798 	struct iscsi_internal *priv;
4799 
4800 	if (!iscsi_is_session_dev(dev))
4801 		return 0;
4802 
4803 	session = iscsi_dev_to_session(dev);
4804 	shost = iscsi_session_to_shost(session);
4805 	if (!shost->transportt)
4806 		return 0;
4807 
4808 	priv = to_iscsi_internal(shost->transportt);
4809 	if (priv->session_cont.ac.class != &iscsi_session_class.class)
4810 		return 0;
4811 
4812 	return &priv->session_cont.ac == cont;
4813 }
4814 
iscsi_conn_match(struct attribute_container * cont,struct device * dev)4815 static int iscsi_conn_match(struct attribute_container *cont,
4816 			   struct device *dev)
4817 {
4818 	struct iscsi_cls_session *session;
4819 	struct iscsi_cls_conn *conn;
4820 	struct Scsi_Host *shost;
4821 	struct iscsi_internal *priv;
4822 
4823 	if (!iscsi_is_conn_dev(dev))
4824 		return 0;
4825 
4826 	conn = iscsi_dev_to_conn(dev);
4827 	session = iscsi_dev_to_session(conn->dev.parent);
4828 	shost = iscsi_session_to_shost(session);
4829 
4830 	if (!shost->transportt)
4831 		return 0;
4832 
4833 	priv = to_iscsi_internal(shost->transportt);
4834 	if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4835 		return 0;
4836 
4837 	return &priv->conn_cont.ac == cont;
4838 }
4839 
iscsi_host_match(struct attribute_container * cont,struct device * dev)4840 static int iscsi_host_match(struct attribute_container *cont,
4841 			    struct device *dev)
4842 {
4843 	struct Scsi_Host *shost;
4844 	struct iscsi_internal *priv;
4845 
4846 	if (!scsi_is_host_device(dev))
4847 		return 0;
4848 
4849 	shost = dev_to_shost(dev);
4850 	if (!shost->transportt  ||
4851 	    shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4852 		return 0;
4853 
4854         priv = to_iscsi_internal(shost->transportt);
4855         return &priv->t.host_attrs.ac == cont;
4856 }
4857 
4858 struct scsi_transport_template *
iscsi_register_transport(struct iscsi_transport * tt)4859 iscsi_register_transport(struct iscsi_transport *tt)
4860 {
4861 	struct iscsi_internal *priv;
4862 	unsigned long flags;
4863 	int err;
4864 
4865 	BUG_ON(!tt);
4866 	WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4867 
4868 	priv = iscsi_if_transport_lookup(tt);
4869 	if (priv)
4870 		return NULL;
4871 
4872 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4873 	if (!priv)
4874 		return NULL;
4875 	INIT_LIST_HEAD(&priv->list);
4876 	priv->iscsi_transport = tt;
4877 	priv->t.user_scan = iscsi_user_scan;
4878 
4879 	priv->dev.class = &iscsi_transport_class;
4880 	dev_set_name(&priv->dev, "%s", tt->name);
4881 	err = device_register(&priv->dev);
4882 	if (err)
4883 		goto put_dev;
4884 
4885 	err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4886 	if (err)
4887 		goto unregister_dev;
4888 
4889 	/* host parameters */
4890 	priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4891 	priv->t.host_attrs.ac.match = iscsi_host_match;
4892 	priv->t.host_attrs.ac.grp = &iscsi_host_group;
4893 	priv->t.host_size = sizeof(struct iscsi_cls_host);
4894 	transport_container_register(&priv->t.host_attrs);
4895 
4896 	/* connection parameters */
4897 	priv->conn_cont.ac.class = &iscsi_connection_class.class;
4898 	priv->conn_cont.ac.match = iscsi_conn_match;
4899 	priv->conn_cont.ac.grp = &iscsi_conn_group;
4900 	transport_container_register(&priv->conn_cont);
4901 
4902 	/* session parameters */
4903 	priv->session_cont.ac.class = &iscsi_session_class.class;
4904 	priv->session_cont.ac.match = iscsi_session_match;
4905 	priv->session_cont.ac.grp = &iscsi_session_group;
4906 	transport_container_register(&priv->session_cont);
4907 
4908 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4909 	list_add(&priv->list, &iscsi_transports);
4910 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4911 
4912 	printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4913 	return &priv->t;
4914 
4915 unregister_dev:
4916 	device_unregister(&priv->dev);
4917 	return NULL;
4918 put_dev:
4919 	put_device(&priv->dev);
4920 	return NULL;
4921 }
4922 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4923 
iscsi_unregister_transport(struct iscsi_transport * tt)4924 void iscsi_unregister_transport(struct iscsi_transport *tt)
4925 {
4926 	struct iscsi_internal *priv;
4927 	unsigned long flags;
4928 
4929 	BUG_ON(!tt);
4930 
4931 	mutex_lock(&rx_queue_mutex);
4932 
4933 	priv = iscsi_if_transport_lookup(tt);
4934 	BUG_ON (!priv);
4935 
4936 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4937 	list_del(&priv->list);
4938 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4939 
4940 	transport_container_unregister(&priv->conn_cont);
4941 	transport_container_unregister(&priv->session_cont);
4942 	transport_container_unregister(&priv->t.host_attrs);
4943 
4944 	sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4945 	device_unregister(&priv->dev);
4946 	mutex_unlock(&rx_queue_mutex);
4947 }
4948 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4949 
iscsi_dbg_trace(void (* trace)(struct device * dev,struct va_format *),struct device * dev,const char * fmt,...)4950 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4951 		     struct device *dev, const char *fmt, ...)
4952 {
4953 	struct va_format vaf;
4954 	va_list args;
4955 
4956 	va_start(args, fmt);
4957 	vaf.fmt = fmt;
4958 	vaf.va = &args;
4959 	trace(dev, &vaf);
4960 	va_end(args);
4961 }
4962 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4963 
iscsi_transport_init(void)4964 static __init int iscsi_transport_init(void)
4965 {
4966 	int err;
4967 	struct netlink_kernel_cfg cfg = {
4968 		.groups	= 1,
4969 		.input	= iscsi_if_rx,
4970 	};
4971 	printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4972 		ISCSI_TRANSPORT_VERSION);
4973 
4974 	atomic_set(&iscsi_session_nr, 0);
4975 
4976 	err = class_register(&iscsi_transport_class);
4977 	if (err)
4978 		return err;
4979 
4980 	err = class_register(&iscsi_endpoint_class);
4981 	if (err)
4982 		goto unregister_transport_class;
4983 
4984 	err = class_register(&iscsi_iface_class);
4985 	if (err)
4986 		goto unregister_endpoint_class;
4987 
4988 	err = transport_class_register(&iscsi_host_class);
4989 	if (err)
4990 		goto unregister_iface_class;
4991 
4992 	err = transport_class_register(&iscsi_connection_class);
4993 	if (err)
4994 		goto unregister_host_class;
4995 
4996 	err = transport_class_register(&iscsi_session_class);
4997 	if (err)
4998 		goto unregister_conn_class;
4999 
5000 	err = bus_register(&iscsi_flashnode_bus);
5001 	if (err)
5002 		goto unregister_session_class;
5003 
5004 	nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
5005 	if (!nls) {
5006 		err = -ENOBUFS;
5007 		goto unregister_flashnode_bus;
5008 	}
5009 
5010 	iscsi_conn_cleanup_workq = alloc_workqueue("%s",
5011 			WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
5012 			"iscsi_conn_cleanup");
5013 	if (!iscsi_conn_cleanup_workq) {
5014 		err = -ENOMEM;
5015 		goto release_nls;
5016 	}
5017 
5018 	return 0;
5019 
5020 release_nls:
5021 	netlink_kernel_release(nls);
5022 unregister_flashnode_bus:
5023 	bus_unregister(&iscsi_flashnode_bus);
5024 unregister_session_class:
5025 	transport_class_unregister(&iscsi_session_class);
5026 unregister_conn_class:
5027 	transport_class_unregister(&iscsi_connection_class);
5028 unregister_host_class:
5029 	transport_class_unregister(&iscsi_host_class);
5030 unregister_iface_class:
5031 	class_unregister(&iscsi_iface_class);
5032 unregister_endpoint_class:
5033 	class_unregister(&iscsi_endpoint_class);
5034 unregister_transport_class:
5035 	class_unregister(&iscsi_transport_class);
5036 	return err;
5037 }
5038 
iscsi_transport_exit(void)5039 static void __exit iscsi_transport_exit(void)
5040 {
5041 	destroy_workqueue(iscsi_conn_cleanup_workq);
5042 	netlink_kernel_release(nls);
5043 	bus_unregister(&iscsi_flashnode_bus);
5044 	transport_class_unregister(&iscsi_connection_class);
5045 	transport_class_unregister(&iscsi_session_class);
5046 	transport_class_unregister(&iscsi_host_class);
5047 	class_unregister(&iscsi_endpoint_class);
5048 	class_unregister(&iscsi_iface_class);
5049 	class_unregister(&iscsi_transport_class);
5050 }
5051 
5052 module_init(iscsi_transport_init);
5053 module_exit(iscsi_transport_exit);
5054 
5055 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
5056 	      "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
5057 	      "Alex Aizman <itn780@yahoo.com>");
5058 MODULE_DESCRIPTION("iSCSI Transport Interface");
5059 MODULE_LICENSE("GPL");
5060 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
5061 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
5062