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84314fd4 JS |
1 | /* |
2 | * scsi_netlink.c - SCSI Transport Netlink Interface | |
3 | * | |
4 | * Copyright (C) 2006 James Smart, Emulex Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | #include <linux/time.h> | |
22 | #include <linux/jiffies.h> | |
23 | #include <linux/security.h> | |
22447be7 | 24 | #include <linux/delay.h> |
84314fd4 JS |
25 | #include <net/sock.h> |
26 | #include <net/netlink.h> | |
27 | ||
28 | #include <scsi/scsi_netlink.h> | |
29 | #include "scsi_priv.h" | |
30 | ||
31 | struct sock *scsi_nl_sock = NULL; | |
32 | EXPORT_SYMBOL_GPL(scsi_nl_sock); | |
33 | ||
22447be7 JS |
34 | static DEFINE_SPINLOCK(scsi_nl_lock); |
35 | static struct list_head scsi_nl_drivers; | |
36 | ||
37 | static u32 scsi_nl_state; | |
38 | #define STATE_EHANDLER_BSY 0x00000001 | |
39 | ||
40 | struct scsi_nl_transport { | |
41 | int (*msg_handler)(struct sk_buff *); | |
42 | void (*event_handler)(struct notifier_block *, unsigned long, void *); | |
43 | unsigned int refcnt; | |
44 | int flags; | |
45 | }; | |
46 | ||
47 | /* flags values (bit flags) */ | |
48 | #define HANDLER_DELETING 0x1 | |
49 | ||
50 | static struct scsi_nl_transport transports[SCSI_NL_MAX_TRANSPORTS] = | |
51 | { {NULL, }, }; | |
52 | ||
53 | ||
54 | struct scsi_nl_drvr { | |
55 | struct list_head next; | |
56 | int (*dmsg_handler)(struct Scsi_Host *shost, void *payload, | |
57 | u32 len, u32 pid); | |
58 | void (*devt_handler)(struct notifier_block *nb, | |
59 | unsigned long event, void *notify_ptr); | |
60 | struct scsi_host_template *hostt; | |
61 | u64 vendor_id; | |
62 | unsigned int refcnt; | |
63 | int flags; | |
64 | }; | |
65 | ||
66 | ||
84314fd4 JS |
67 | |
68 | /** | |
eb44820c RL |
69 | * scsi_nl_rcv_msg - Receive message handler. |
70 | * @skb: socket receive buffer | |
71 | * | |
72 | * Description: Extracts message from a receive buffer. | |
84314fd4 JS |
73 | * Validates message header and calls appropriate transport message handler |
74 | * | |
84314fd4 JS |
75 | * |
76 | **/ | |
77 | static void | |
78 | scsi_nl_rcv_msg(struct sk_buff *skb) | |
79 | { | |
80 | struct nlmsghdr *nlh; | |
81 | struct scsi_nl_hdr *hdr; | |
22447be7 JS |
82 | unsigned long flags; |
83 | u32 rlen; | |
84 | int err, tport; | |
84314fd4 JS |
85 | |
86 | while (skb->len >= NLMSG_SPACE(0)) { | |
87 | err = 0; | |
88 | ||
b529ccf2 | 89 | nlh = nlmsg_hdr(skb); |
84314fd4 JS |
90 | if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) || |
91 | (skb->len < nlh->nlmsg_len)) { | |
92 | printk(KERN_WARNING "%s: discarding partial skb\n", | |
cadbd4a5 | 93 | __func__); |
84314fd4 JS |
94 | return; |
95 | } | |
96 | ||
97 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
98 | if (rlen > skb->len) | |
99 | rlen = skb->len; | |
100 | ||
101 | if (nlh->nlmsg_type != SCSI_TRANSPORT_MSG) { | |
102 | err = -EBADMSG; | |
22447be7 | 103 | goto next_msg; |
84314fd4 JS |
104 | } |
105 | ||
106 | hdr = NLMSG_DATA(nlh); | |
107 | if ((hdr->version != SCSI_NL_VERSION) || | |
108 | (hdr->magic != SCSI_NL_MAGIC)) { | |
109 | err = -EPROTOTYPE; | |
110 | goto next_msg; | |
111 | } | |
112 | ||
113 | if (security_netlink_recv(skb, CAP_SYS_ADMIN)) { | |
114 | err = -EPERM; | |
115 | goto next_msg; | |
116 | } | |
117 | ||
118 | if (nlh->nlmsg_len < (sizeof(*nlh) + hdr->msglen)) { | |
119 | printk(KERN_WARNING "%s: discarding partial message\n", | |
cadbd4a5 | 120 | __func__); |
22447be7 | 121 | goto next_msg; |
84314fd4 JS |
122 | } |
123 | ||
124 | /* | |
22447be7 | 125 | * Deliver message to the appropriate transport |
84314fd4 | 126 | */ |
22447be7 JS |
127 | spin_lock_irqsave(&scsi_nl_lock, flags); |
128 | ||
129 | tport = hdr->transport; | |
130 | if ((tport < SCSI_NL_MAX_TRANSPORTS) && | |
131 | !(transports[tport].flags & HANDLER_DELETING) && | |
132 | (transports[tport].msg_handler)) { | |
133 | transports[tport].refcnt++; | |
134 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
135 | err = transports[tport].msg_handler(skb); | |
136 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
137 | transports[tport].refcnt--; | |
138 | } else | |
139 | err = -ENOENT; | |
140 | ||
141 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
84314fd4 JS |
142 | |
143 | next_msg: | |
144 | if ((err) || (nlh->nlmsg_flags & NLM_F_ACK)) | |
145 | netlink_ack(skb, nlh, err); | |
146 | ||
147 | skb_pull(skb, rlen); | |
148 | } | |
149 | } | |
150 | ||
151 | ||
84314fd4 | 152 | /** |
eb44820c | 153 | * scsi_nl_rcv_event - Event handler for a netlink socket. |
84314fd4 JS |
154 | * @this: event notifier block |
155 | * @event: event type | |
156 | * @ptr: event payload | |
157 | * | |
158 | **/ | |
159 | static int | |
160 | scsi_nl_rcv_event(struct notifier_block *this, unsigned long event, void *ptr) | |
161 | { | |
162 | struct netlink_notify *n = ptr; | |
22447be7 JS |
163 | struct scsi_nl_drvr *driver; |
164 | unsigned long flags; | |
165 | int tport; | |
84314fd4 JS |
166 | |
167 | if (n->protocol != NETLINK_SCSITRANSPORT) | |
168 | return NOTIFY_DONE; | |
169 | ||
22447be7 JS |
170 | spin_lock_irqsave(&scsi_nl_lock, flags); |
171 | scsi_nl_state |= STATE_EHANDLER_BSY; | |
172 | ||
84314fd4 | 173 | /* |
22447be7 | 174 | * Pass event on to any transports that may be listening |
84314fd4 | 175 | */ |
22447be7 JS |
176 | for (tport = 0; tport < SCSI_NL_MAX_TRANSPORTS; tport++) { |
177 | if (!(transports[tport].flags & HANDLER_DELETING) && | |
178 | (transports[tport].event_handler)) { | |
179 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
180 | transports[tport].event_handler(this, event, ptr); | |
181 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
182 | } | |
183 | } | |
184 | ||
185 | /* | |
186 | * Pass event on to any drivers that may be listening | |
187 | */ | |
188 | list_for_each_entry(driver, &scsi_nl_drivers, next) { | |
189 | if (!(driver->flags & HANDLER_DELETING) && | |
190 | (driver->devt_handler)) { | |
191 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
192 | driver->devt_handler(this, event, ptr); | |
193 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
194 | } | |
195 | } | |
196 | ||
197 | scsi_nl_state &= ~STATE_EHANDLER_BSY; | |
198 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
84314fd4 JS |
199 | |
200 | return NOTIFY_DONE; | |
201 | } | |
202 | ||
203 | static struct notifier_block scsi_netlink_notifier = { | |
204 | .notifier_call = scsi_nl_rcv_event, | |
205 | }; | |
206 | ||
207 | ||
208 | /** | |
22447be7 JS |
209 | * GENERIC SCSI transport receive and event handlers |
210 | **/ | |
211 | ||
212 | /** | |
213 | * scsi_generic_msg_handler - receive message handler for GENERIC transport | |
214 | * messages | |
215 | * | |
216 | * @skb: socket receive buffer | |
217 | * | |
218 | **/ | |
219 | static int | |
220 | scsi_generic_msg_handler(struct sk_buff *skb) | |
221 | { | |
222 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
223 | struct scsi_nl_hdr *snlh = NLMSG_DATA(nlh); | |
224 | struct scsi_nl_drvr *driver; | |
225 | struct Scsi_Host *shost; | |
226 | unsigned long flags; | |
227 | int err = 0, match, pid; | |
228 | ||
229 | pid = NETLINK_CREDS(skb)->pid; | |
230 | ||
231 | switch (snlh->msgtype) { | |
232 | case SCSI_NL_SHOST_VENDOR: | |
233 | { | |
234 | struct scsi_nl_host_vendor_msg *msg = NLMSG_DATA(nlh); | |
235 | ||
236 | /* Locate the driver that corresponds to the message */ | |
237 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
238 | match = 0; | |
239 | list_for_each_entry(driver, &scsi_nl_drivers, next) { | |
240 | if (driver->vendor_id == msg->vendor_id) { | |
241 | match = 1; | |
242 | break; | |
243 | } | |
244 | } | |
245 | ||
246 | if ((!match) || (!driver->dmsg_handler)) { | |
247 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
248 | err = -ESRCH; | |
249 | goto rcv_exit; | |
250 | } | |
251 | ||
252 | if (driver->flags & HANDLER_DELETING) { | |
253 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
254 | err = -ESHUTDOWN; | |
255 | goto rcv_exit; | |
256 | } | |
257 | ||
258 | driver->refcnt++; | |
259 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
260 | ||
261 | ||
262 | /* if successful, scsi_host_lookup takes a shost reference */ | |
263 | shost = scsi_host_lookup(msg->host_no); | |
264 | if (!shost) { | |
265 | err = -ENODEV; | |
266 | goto driver_exit; | |
267 | } | |
268 | ||
269 | /* is this host owned by the vendor ? */ | |
270 | if (shost->hostt != driver->hostt) { | |
271 | err = -EINVAL; | |
272 | goto vendormsg_put; | |
273 | } | |
274 | ||
275 | /* pass message on to the driver */ | |
276 | err = driver->dmsg_handler(shost, (void *)&msg[1], | |
277 | msg->vmsg_datalen, pid); | |
278 | ||
279 | vendormsg_put: | |
280 | /* release reference by scsi_host_lookup */ | |
281 | scsi_host_put(shost); | |
282 | ||
283 | driver_exit: | |
284 | /* release our own reference on the registration object */ | |
285 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
286 | driver->refcnt--; | |
287 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
288 | break; | |
289 | } | |
290 | ||
291 | default: | |
292 | err = -EBADR; | |
293 | break; | |
294 | } | |
295 | ||
296 | rcv_exit: | |
297 | if (err) | |
298 | printk(KERN_WARNING "%s: Msgtype %d failed - err %d\n", | |
299 | __func__, snlh->msgtype, err); | |
300 | return err; | |
301 | } | |
302 | ||
303 | ||
304 | /** | |
305 | * scsi_nl_add_transport - | |
306 | * Registers message and event handlers for a transport. Enables | |
307 | * receipt of netlink messages and events to a transport. | |
308 | * | |
309 | * @tport: transport registering handlers | |
310 | * @msg_handler: receive message handler callback | |
311 | * @event_handler: receive event handler callback | |
312 | **/ | |
313 | int | |
314 | scsi_nl_add_transport(u8 tport, | |
315 | int (*msg_handler)(struct sk_buff *), | |
316 | void (*event_handler)(struct notifier_block *, unsigned long, void *)) | |
317 | { | |
318 | unsigned long flags; | |
319 | int err = 0; | |
320 | ||
321 | if (tport >= SCSI_NL_MAX_TRANSPORTS) | |
322 | return -EINVAL; | |
323 | ||
324 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
325 | ||
326 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
327 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
328 | msleep(1); | |
329 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
330 | } | |
331 | ||
332 | if (transports[tport].msg_handler || transports[tport].event_handler) { | |
333 | err = -EALREADY; | |
334 | goto register_out; | |
335 | } | |
336 | ||
337 | transports[tport].msg_handler = msg_handler; | |
338 | transports[tport].event_handler = event_handler; | |
339 | transports[tport].flags = 0; | |
340 | transports[tport].refcnt = 0; | |
341 | ||
342 | register_out: | |
343 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
344 | ||
345 | return err; | |
346 | } | |
347 | EXPORT_SYMBOL_GPL(scsi_nl_add_transport); | |
348 | ||
349 | ||
350 | /** | |
351 | * scsi_nl_remove_transport - | |
352 | * Disable transport receiption of messages and events | |
353 | * | |
354 | * @tport: transport deregistering handlers | |
355 | * | |
356 | **/ | |
357 | void | |
358 | scsi_nl_remove_transport(u8 tport) | |
359 | { | |
360 | unsigned long flags; | |
361 | ||
362 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
363 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
364 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
365 | msleep(1); | |
366 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
367 | } | |
368 | ||
369 | if (tport < SCSI_NL_MAX_TRANSPORTS) { | |
370 | transports[tport].flags |= HANDLER_DELETING; | |
371 | ||
372 | while (transports[tport].refcnt != 0) { | |
373 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
374 | schedule_timeout_uninterruptible(HZ/4); | |
375 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
376 | } | |
377 | transports[tport].msg_handler = NULL; | |
378 | transports[tport].event_handler = NULL; | |
379 | transports[tport].flags = 0; | |
380 | } | |
381 | ||
382 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
383 | ||
384 | return; | |
385 | } | |
386 | EXPORT_SYMBOL_GPL(scsi_nl_remove_transport); | |
387 | ||
388 | ||
389 | /** | |
390 | * scsi_nl_add_driver - | |
391 | * A driver is registering its interfaces for SCSI netlink messages | |
392 | * | |
393 | * @vendor_id: A unique identification value for the driver. | |
394 | * @hostt: address of the driver's host template. Used | |
395 | * to verify an shost is bound to the driver | |
396 | * @nlmsg_handler: receive message handler callback | |
397 | * @nlevt_handler: receive event handler callback | |
398 | * | |
399 | * Returns: | |
400 | * 0 on Success | |
401 | * error result otherwise | |
402 | **/ | |
403 | int | |
404 | scsi_nl_add_driver(u64 vendor_id, struct scsi_host_template *hostt, | |
405 | int (*nlmsg_handler)(struct Scsi_Host *shost, void *payload, | |
406 | u32 len, u32 pid), | |
407 | void (*nlevt_handler)(struct notifier_block *nb, | |
408 | unsigned long event, void *notify_ptr)) | |
409 | { | |
410 | struct scsi_nl_drvr *driver; | |
411 | unsigned long flags; | |
412 | ||
413 | driver = kzalloc(sizeof(*driver), GFP_KERNEL); | |
414 | if (unlikely(!driver)) { | |
415 | printk(KERN_ERR "%s: allocation failure\n", __func__); | |
416 | return -ENOMEM; | |
417 | } | |
418 | ||
419 | driver->dmsg_handler = nlmsg_handler; | |
420 | driver->devt_handler = nlevt_handler; | |
421 | driver->hostt = hostt; | |
422 | driver->vendor_id = vendor_id; | |
423 | ||
424 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
425 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
426 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
427 | msleep(1); | |
428 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
429 | } | |
430 | list_add_tail(&driver->next, &scsi_nl_drivers); | |
431 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
432 | ||
433 | return 0; | |
434 | } | |
435 | EXPORT_SYMBOL_GPL(scsi_nl_add_driver); | |
436 | ||
437 | ||
438 | /** | |
439 | * scsi_nl_remove_driver - | |
440 | * An driver is unregistering with the SCSI netlink messages | |
441 | * | |
442 | * @vendor_id: The unique identification value for the driver. | |
443 | **/ | |
444 | void | |
445 | scsi_nl_remove_driver(u64 vendor_id) | |
446 | { | |
447 | struct scsi_nl_drvr *driver; | |
448 | unsigned long flags; | |
449 | ||
450 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
451 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
452 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
453 | msleep(1); | |
454 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
455 | } | |
456 | ||
457 | list_for_each_entry(driver, &scsi_nl_drivers, next) { | |
458 | if (driver->vendor_id == vendor_id) { | |
459 | driver->flags |= HANDLER_DELETING; | |
460 | while (driver->refcnt != 0) { | |
461 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
462 | schedule_timeout_uninterruptible(HZ/4); | |
463 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
464 | } | |
465 | list_del(&driver->next); | |
466 | kfree(driver); | |
467 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
468 | return; | |
469 | } | |
470 | } | |
471 | ||
472 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
473 | ||
474 | printk(KERN_ERR "%s: removal of driver failed - vendor_id 0x%llx\n", | |
475 | __func__, (unsigned long long)vendor_id); | |
476 | return; | |
477 | } | |
478 | EXPORT_SYMBOL_GPL(scsi_nl_remove_driver); | |
479 | ||
480 | ||
481 | /** | |
482 | * scsi_netlink_init - Called by SCSI subsystem to intialize | |
483 | * the SCSI transport netlink interface | |
84314fd4 JS |
484 | * |
485 | **/ | |
486 | void | |
487 | scsi_netlink_init(void) | |
488 | { | |
489 | int error; | |
490 | ||
22447be7 JS |
491 | INIT_LIST_HEAD(&scsi_nl_drivers); |
492 | ||
84314fd4 JS |
493 | error = netlink_register_notifier(&scsi_netlink_notifier); |
494 | if (error) { | |
495 | printk(KERN_ERR "%s: register of event handler failed - %d\n", | |
cadbd4a5 | 496 | __func__, error); |
84314fd4 JS |
497 | return; |
498 | } | |
499 | ||
b4b51029 | 500 | scsi_nl_sock = netlink_kernel_create(&init_net, NETLINK_SCSITRANSPORT, |
cd40b7d3 | 501 | SCSI_NL_GRP_CNT, scsi_nl_rcv_msg, NULL, |
af65bdfc | 502 | THIS_MODULE); |
84314fd4 JS |
503 | if (!scsi_nl_sock) { |
504 | printk(KERN_ERR "%s: register of recieve handler failed\n", | |
cadbd4a5 | 505 | __func__); |
84314fd4 | 506 | netlink_unregister_notifier(&scsi_netlink_notifier); |
22447be7 | 507 | return; |
84314fd4 JS |
508 | } |
509 | ||
22447be7 JS |
510 | /* Register the entry points for the generic SCSI transport */ |
511 | error = scsi_nl_add_transport(SCSI_NL_TRANSPORT, | |
512 | scsi_generic_msg_handler, NULL); | |
513 | if (error) | |
514 | printk(KERN_ERR "%s: register of GENERIC transport handler" | |
515 | " failed - %d\n", __func__, error); | |
84314fd4 JS |
516 | return; |
517 | } | |
518 | ||
519 | ||
520 | /** | |
eb44820c | 521 | * scsi_netlink_exit - Called by SCSI subsystem to disable the SCSI transport netlink interface |
84314fd4 JS |
522 | * |
523 | **/ | |
524 | void | |
525 | scsi_netlink_exit(void) | |
526 | { | |
22447be7 JS |
527 | scsi_nl_remove_transport(SCSI_NL_TRANSPORT); |
528 | ||
84314fd4 | 529 | if (scsi_nl_sock) { |
b7c6ba6e | 530 | netlink_kernel_release(scsi_nl_sock); |
84314fd4 JS |
531 | netlink_unregister_notifier(&scsi_netlink_notifier); |
532 | } | |
533 | ||
534 | return; | |
535 | } | |
536 | ||
537 | ||
22447be7 JS |
538 | /* |
539 | * Exported Interfaces | |
540 | */ | |
541 | ||
542 | /** | |
543 | * scsi_nl_send_transport_msg - | |
544 | * Generic function to send a single message from a SCSI transport to | |
545 | * a single process | |
546 | * | |
547 | * @pid: receiving pid | |
548 | * @hdr: message payload | |
549 | * | |
550 | **/ | |
551 | void | |
552 | scsi_nl_send_transport_msg(u32 pid, struct scsi_nl_hdr *hdr) | |
553 | { | |
554 | struct sk_buff *skb; | |
555 | struct nlmsghdr *nlh; | |
556 | const char *fn; | |
557 | char *datab; | |
558 | u32 len, skblen; | |
559 | int err; | |
560 | ||
561 | if (!scsi_nl_sock) { | |
562 | err = -ENOENT; | |
563 | fn = "netlink socket"; | |
564 | goto msg_fail; | |
565 | } | |
566 | ||
567 | len = NLMSG_SPACE(hdr->msglen); | |
568 | skblen = NLMSG_SPACE(len); | |
569 | ||
570 | skb = alloc_skb(skblen, GFP_KERNEL); | |
571 | if (!skb) { | |
572 | err = -ENOBUFS; | |
573 | fn = "alloc_skb"; | |
574 | goto msg_fail; | |
575 | } | |
576 | ||
577 | nlh = nlmsg_put(skb, pid, 0, SCSI_TRANSPORT_MSG, len - sizeof(*nlh), 0); | |
578 | if (!nlh) { | |
579 | err = -ENOBUFS; | |
580 | fn = "nlmsg_put"; | |
581 | goto msg_fail_skb; | |
582 | } | |
583 | datab = NLMSG_DATA(nlh); | |
584 | memcpy(datab, hdr, hdr->msglen); | |
585 | ||
586 | err = nlmsg_unicast(scsi_nl_sock, skb, pid); | |
587 | if (err < 0) { | |
588 | fn = "nlmsg_unicast"; | |
589 | /* nlmsg_unicast already kfree_skb'd */ | |
590 | goto msg_fail; | |
591 | } | |
592 | ||
593 | return; | |
594 | ||
595 | msg_fail_skb: | |
596 | kfree_skb(skb); | |
597 | msg_fail: | |
598 | printk(KERN_WARNING | |
599 | "%s: Dropped Message : pid %d Transport %d, msgtype x%x, " | |
600 | "msglen %d: %s : err %d\n", | |
601 | __func__, pid, hdr->transport, hdr->msgtype, hdr->msglen, | |
602 | fn, err); | |
603 | return; | |
604 | } | |
605 | EXPORT_SYMBOL_GPL(scsi_nl_send_transport_msg); | |
606 | ||
607 | ||
608 | /** | |
609 | * scsi_nl_send_vendor_msg - called to send a shost vendor unique message | |
610 | * to a specific process id. | |
611 | * | |
612 | * @pid: process id of the receiver | |
613 | * @host_no: host # sending the message | |
614 | * @vendor_id: unique identifier for the driver's vendor | |
615 | * @data_len: amount, in bytes, of vendor unique payload data | |
616 | * @data_buf: pointer to vendor unique data buffer | |
617 | * | |
618 | * Returns: | |
619 | * 0 on succesful return | |
620 | * otherwise, failing error code | |
621 | * | |
622 | * Notes: | |
623 | * This routine assumes no locks are held on entry. | |
624 | */ | |
625 | int | |
626 | scsi_nl_send_vendor_msg(u32 pid, unsigned short host_no, u64 vendor_id, | |
627 | char *data_buf, u32 data_len) | |
628 | { | |
629 | struct sk_buff *skb; | |
630 | struct nlmsghdr *nlh; | |
631 | struct scsi_nl_host_vendor_msg *msg; | |
632 | u32 len, skblen; | |
633 | int err; | |
634 | ||
635 | if (!scsi_nl_sock) { | |
636 | err = -ENOENT; | |
637 | goto send_vendor_fail; | |
638 | } | |
639 | ||
640 | len = SCSI_NL_MSGALIGN(sizeof(*msg) + data_len); | |
641 | skblen = NLMSG_SPACE(len); | |
642 | ||
643 | skb = alloc_skb(skblen, GFP_KERNEL); | |
644 | if (!skb) { | |
645 | err = -ENOBUFS; | |
646 | goto send_vendor_fail; | |
647 | } | |
648 | ||
649 | nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, | |
650 | skblen - sizeof(*nlh), 0); | |
651 | if (!nlh) { | |
652 | err = -ENOBUFS; | |
653 | goto send_vendor_fail_skb; | |
654 | } | |
655 | msg = NLMSG_DATA(nlh); | |
656 | ||
657 | INIT_SCSI_NL_HDR(&msg->snlh, SCSI_NL_TRANSPORT, | |
658 | SCSI_NL_SHOST_VENDOR, len); | |
659 | msg->vendor_id = vendor_id; | |
660 | msg->host_no = host_no; | |
661 | msg->vmsg_datalen = data_len; /* bytes */ | |
662 | memcpy(&msg[1], data_buf, data_len); | |
663 | ||
664 | err = nlmsg_unicast(scsi_nl_sock, skb, pid); | |
665 | if (err) | |
666 | /* nlmsg_multicast already kfree_skb'd */ | |
667 | goto send_vendor_fail; | |
668 | ||
669 | return 0; | |
670 | ||
671 | send_vendor_fail_skb: | |
672 | kfree_skb(skb); | |
673 | send_vendor_fail: | |
674 | printk(KERN_WARNING | |
675 | "%s: Dropped SCSI Msg : host %d vendor_unique - err %d\n", | |
676 | __func__, host_no, err); | |
677 | return err; | |
678 | } | |
679 | EXPORT_SYMBOL(scsi_nl_send_vendor_msg); | |
680 | ||
681 |