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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> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
84314fd4 JS |
26 | #include <net/sock.h> |
27 | #include <net/netlink.h> | |
28 | ||
29 | #include <scsi/scsi_netlink.h> | |
30 | #include "scsi_priv.h" | |
31 | ||
32 | struct sock *scsi_nl_sock = NULL; | |
33 | EXPORT_SYMBOL_GPL(scsi_nl_sock); | |
34 | ||
22447be7 JS |
35 | static DEFINE_SPINLOCK(scsi_nl_lock); |
36 | static struct list_head scsi_nl_drivers; | |
37 | ||
38 | static u32 scsi_nl_state; | |
39 | #define STATE_EHANDLER_BSY 0x00000001 | |
40 | ||
41 | struct scsi_nl_transport { | |
42 | int (*msg_handler)(struct sk_buff *); | |
43 | void (*event_handler)(struct notifier_block *, unsigned long, void *); | |
44 | unsigned int refcnt; | |
45 | int flags; | |
46 | }; | |
47 | ||
48 | /* flags values (bit flags) */ | |
49 | #define HANDLER_DELETING 0x1 | |
50 | ||
51 | static struct scsi_nl_transport transports[SCSI_NL_MAX_TRANSPORTS] = | |
52 | { {NULL, }, }; | |
53 | ||
54 | ||
55 | struct scsi_nl_drvr { | |
56 | struct list_head next; | |
57 | int (*dmsg_handler)(struct Scsi_Host *shost, void *payload, | |
58 | u32 len, u32 pid); | |
59 | void (*devt_handler)(struct notifier_block *nb, | |
60 | unsigned long event, void *notify_ptr); | |
61 | struct scsi_host_template *hostt; | |
62 | u64 vendor_id; | |
63 | unsigned int refcnt; | |
64 | int flags; | |
65 | }; | |
66 | ||
67 | ||
84314fd4 JS |
68 | |
69 | /** | |
eb44820c RL |
70 | * scsi_nl_rcv_msg - Receive message handler. |
71 | * @skb: socket receive buffer | |
72 | * | |
73 | * Description: Extracts message from a receive buffer. | |
84314fd4 JS |
74 | * Validates message header and calls appropriate transport message handler |
75 | * | |
84314fd4 JS |
76 | * |
77 | **/ | |
78 | static void | |
79 | scsi_nl_rcv_msg(struct sk_buff *skb) | |
80 | { | |
81 | struct nlmsghdr *nlh; | |
82 | struct scsi_nl_hdr *hdr; | |
22447be7 JS |
83 | unsigned long flags; |
84 | u32 rlen; | |
85 | int err, tport; | |
84314fd4 JS |
86 | |
87 | while (skb->len >= NLMSG_SPACE(0)) { | |
88 | err = 0; | |
89 | ||
b529ccf2 | 90 | nlh = nlmsg_hdr(skb); |
84314fd4 JS |
91 | if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) || |
92 | (skb->len < nlh->nlmsg_len)) { | |
93 | printk(KERN_WARNING "%s: discarding partial skb\n", | |
cadbd4a5 | 94 | __func__); |
84314fd4 JS |
95 | return; |
96 | } | |
97 | ||
98 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
99 | if (rlen > skb->len) | |
100 | rlen = skb->len; | |
101 | ||
102 | if (nlh->nlmsg_type != SCSI_TRANSPORT_MSG) { | |
103 | err = -EBADMSG; | |
22447be7 | 104 | goto next_msg; |
84314fd4 JS |
105 | } |
106 | ||
107 | hdr = NLMSG_DATA(nlh); | |
108 | if ((hdr->version != SCSI_NL_VERSION) || | |
109 | (hdr->magic != SCSI_NL_MAGIC)) { | |
110 | err = -EPROTOTYPE; | |
111 | goto next_msg; | |
112 | } | |
113 | ||
114 | if (security_netlink_recv(skb, CAP_SYS_ADMIN)) { | |
115 | err = -EPERM; | |
116 | goto next_msg; | |
117 | } | |
118 | ||
119 | if (nlh->nlmsg_len < (sizeof(*nlh) + hdr->msglen)) { | |
120 | printk(KERN_WARNING "%s: discarding partial message\n", | |
cadbd4a5 | 121 | __func__); |
22447be7 | 122 | goto next_msg; |
84314fd4 JS |
123 | } |
124 | ||
125 | /* | |
22447be7 | 126 | * Deliver message to the appropriate transport |
84314fd4 | 127 | */ |
22447be7 JS |
128 | spin_lock_irqsave(&scsi_nl_lock, flags); |
129 | ||
130 | tport = hdr->transport; | |
131 | if ((tport < SCSI_NL_MAX_TRANSPORTS) && | |
132 | !(transports[tport].flags & HANDLER_DELETING) && | |
133 | (transports[tport].msg_handler)) { | |
134 | transports[tport].refcnt++; | |
135 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
136 | err = transports[tport].msg_handler(skb); | |
137 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
138 | transports[tport].refcnt--; | |
139 | } else | |
140 | err = -ENOENT; | |
141 | ||
142 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
84314fd4 JS |
143 | |
144 | next_msg: | |
145 | if ((err) || (nlh->nlmsg_flags & NLM_F_ACK)) | |
146 | netlink_ack(skb, nlh, err); | |
147 | ||
148 | skb_pull(skb, rlen); | |
149 | } | |
150 | } | |
151 | ||
152 | ||
84314fd4 | 153 | /** |
eb44820c | 154 | * scsi_nl_rcv_event - Event handler for a netlink socket. |
84314fd4 JS |
155 | * @this: event notifier block |
156 | * @event: event type | |
157 | * @ptr: event payload | |
158 | * | |
159 | **/ | |
160 | static int | |
161 | scsi_nl_rcv_event(struct notifier_block *this, unsigned long event, void *ptr) | |
162 | { | |
163 | struct netlink_notify *n = ptr; | |
22447be7 JS |
164 | struct scsi_nl_drvr *driver; |
165 | unsigned long flags; | |
166 | int tport; | |
84314fd4 JS |
167 | |
168 | if (n->protocol != NETLINK_SCSITRANSPORT) | |
169 | return NOTIFY_DONE; | |
170 | ||
22447be7 JS |
171 | spin_lock_irqsave(&scsi_nl_lock, flags); |
172 | scsi_nl_state |= STATE_EHANDLER_BSY; | |
173 | ||
84314fd4 | 174 | /* |
22447be7 | 175 | * Pass event on to any transports that may be listening |
84314fd4 | 176 | */ |
22447be7 JS |
177 | for (tport = 0; tport < SCSI_NL_MAX_TRANSPORTS; tport++) { |
178 | if (!(transports[tport].flags & HANDLER_DELETING) && | |
179 | (transports[tport].event_handler)) { | |
180 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
181 | transports[tport].event_handler(this, event, ptr); | |
182 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
183 | } | |
184 | } | |
185 | ||
186 | /* | |
187 | * Pass event on to any drivers that may be listening | |
188 | */ | |
189 | list_for_each_entry(driver, &scsi_nl_drivers, next) { | |
190 | if (!(driver->flags & HANDLER_DELETING) && | |
191 | (driver->devt_handler)) { | |
192 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
193 | driver->devt_handler(this, event, ptr); | |
194 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
195 | } | |
196 | } | |
197 | ||
198 | scsi_nl_state &= ~STATE_EHANDLER_BSY; | |
199 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
84314fd4 JS |
200 | |
201 | return NOTIFY_DONE; | |
202 | } | |
203 | ||
204 | static struct notifier_block scsi_netlink_notifier = { | |
205 | .notifier_call = scsi_nl_rcv_event, | |
206 | }; | |
207 | ||
208 | ||
aa198bf1 | 209 | /* |
22447be7 | 210 | * GENERIC SCSI transport receive and event handlers |
aa198bf1 | 211 | */ |
22447be7 JS |
212 | |
213 | /** | |
aa198bf1 | 214 | * scsi_generic_msg_handler - receive message handler for GENERIC transport messages |
22447be7 | 215 | * @skb: socket receive buffer |
22447be7 JS |
216 | **/ |
217 | static int | |
218 | scsi_generic_msg_handler(struct sk_buff *skb) | |
219 | { | |
220 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
221 | struct scsi_nl_hdr *snlh = NLMSG_DATA(nlh); | |
222 | struct scsi_nl_drvr *driver; | |
223 | struct Scsi_Host *shost; | |
224 | unsigned long flags; | |
225 | int err = 0, match, pid; | |
226 | ||
227 | pid = NETLINK_CREDS(skb)->pid; | |
228 | ||
229 | switch (snlh->msgtype) { | |
230 | case SCSI_NL_SHOST_VENDOR: | |
231 | { | |
232 | struct scsi_nl_host_vendor_msg *msg = NLMSG_DATA(nlh); | |
233 | ||
234 | /* Locate the driver that corresponds to the message */ | |
235 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
236 | match = 0; | |
237 | list_for_each_entry(driver, &scsi_nl_drivers, next) { | |
238 | if (driver->vendor_id == msg->vendor_id) { | |
239 | match = 1; | |
240 | break; | |
241 | } | |
242 | } | |
243 | ||
244 | if ((!match) || (!driver->dmsg_handler)) { | |
245 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
246 | err = -ESRCH; | |
247 | goto rcv_exit; | |
248 | } | |
249 | ||
250 | if (driver->flags & HANDLER_DELETING) { | |
251 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
252 | err = -ESHUTDOWN; | |
253 | goto rcv_exit; | |
254 | } | |
255 | ||
256 | driver->refcnt++; | |
257 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
258 | ||
259 | ||
260 | /* if successful, scsi_host_lookup takes a shost reference */ | |
261 | shost = scsi_host_lookup(msg->host_no); | |
262 | if (!shost) { | |
263 | err = -ENODEV; | |
264 | goto driver_exit; | |
265 | } | |
266 | ||
267 | /* is this host owned by the vendor ? */ | |
268 | if (shost->hostt != driver->hostt) { | |
269 | err = -EINVAL; | |
270 | goto vendormsg_put; | |
271 | } | |
272 | ||
273 | /* pass message on to the driver */ | |
274 | err = driver->dmsg_handler(shost, (void *)&msg[1], | |
275 | msg->vmsg_datalen, pid); | |
276 | ||
277 | vendormsg_put: | |
278 | /* release reference by scsi_host_lookup */ | |
279 | scsi_host_put(shost); | |
280 | ||
281 | driver_exit: | |
282 | /* release our own reference on the registration object */ | |
283 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
284 | driver->refcnt--; | |
285 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
286 | break; | |
287 | } | |
288 | ||
289 | default: | |
290 | err = -EBADR; | |
291 | break; | |
292 | } | |
293 | ||
294 | rcv_exit: | |
295 | if (err) | |
296 | printk(KERN_WARNING "%s: Msgtype %d failed - err %d\n", | |
297 | __func__, snlh->msgtype, err); | |
298 | return err; | |
299 | } | |
300 | ||
301 | ||
302 | /** | |
303 | * scsi_nl_add_transport - | |
304 | * Registers message and event handlers for a transport. Enables | |
305 | * receipt of netlink messages and events to a transport. | |
306 | * | |
307 | * @tport: transport registering handlers | |
308 | * @msg_handler: receive message handler callback | |
309 | * @event_handler: receive event handler callback | |
310 | **/ | |
311 | int | |
312 | scsi_nl_add_transport(u8 tport, | |
313 | int (*msg_handler)(struct sk_buff *), | |
314 | void (*event_handler)(struct notifier_block *, unsigned long, void *)) | |
315 | { | |
316 | unsigned long flags; | |
317 | int err = 0; | |
318 | ||
319 | if (tport >= SCSI_NL_MAX_TRANSPORTS) | |
320 | return -EINVAL; | |
321 | ||
322 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
323 | ||
324 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
325 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
326 | msleep(1); | |
327 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
328 | } | |
329 | ||
330 | if (transports[tport].msg_handler || transports[tport].event_handler) { | |
331 | err = -EALREADY; | |
332 | goto register_out; | |
333 | } | |
334 | ||
335 | transports[tport].msg_handler = msg_handler; | |
336 | transports[tport].event_handler = event_handler; | |
337 | transports[tport].flags = 0; | |
338 | transports[tport].refcnt = 0; | |
339 | ||
340 | register_out: | |
341 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
342 | ||
343 | return err; | |
344 | } | |
345 | EXPORT_SYMBOL_GPL(scsi_nl_add_transport); | |
346 | ||
347 | ||
348 | /** | |
349 | * scsi_nl_remove_transport - | |
350 | * Disable transport receiption of messages and events | |
351 | * | |
352 | * @tport: transport deregistering handlers | |
353 | * | |
354 | **/ | |
355 | void | |
356 | scsi_nl_remove_transport(u8 tport) | |
357 | { | |
358 | unsigned long flags; | |
359 | ||
360 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
361 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
362 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
363 | msleep(1); | |
364 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
365 | } | |
366 | ||
367 | if (tport < SCSI_NL_MAX_TRANSPORTS) { | |
368 | transports[tport].flags |= HANDLER_DELETING; | |
369 | ||
370 | while (transports[tport].refcnt != 0) { | |
371 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
372 | schedule_timeout_uninterruptible(HZ/4); | |
373 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
374 | } | |
375 | transports[tport].msg_handler = NULL; | |
376 | transports[tport].event_handler = NULL; | |
377 | transports[tport].flags = 0; | |
378 | } | |
379 | ||
380 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
381 | ||
382 | return; | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(scsi_nl_remove_transport); | |
385 | ||
386 | ||
387 | /** | |
388 | * scsi_nl_add_driver - | |
389 | * A driver is registering its interfaces for SCSI netlink messages | |
390 | * | |
391 | * @vendor_id: A unique identification value for the driver. | |
392 | * @hostt: address of the driver's host template. Used | |
393 | * to verify an shost is bound to the driver | |
394 | * @nlmsg_handler: receive message handler callback | |
395 | * @nlevt_handler: receive event handler callback | |
396 | * | |
397 | * Returns: | |
398 | * 0 on Success | |
399 | * error result otherwise | |
400 | **/ | |
401 | int | |
402 | scsi_nl_add_driver(u64 vendor_id, struct scsi_host_template *hostt, | |
403 | int (*nlmsg_handler)(struct Scsi_Host *shost, void *payload, | |
404 | u32 len, u32 pid), | |
405 | void (*nlevt_handler)(struct notifier_block *nb, | |
406 | unsigned long event, void *notify_ptr)) | |
407 | { | |
408 | struct scsi_nl_drvr *driver; | |
409 | unsigned long flags; | |
410 | ||
411 | driver = kzalloc(sizeof(*driver), GFP_KERNEL); | |
412 | if (unlikely(!driver)) { | |
413 | printk(KERN_ERR "%s: allocation failure\n", __func__); | |
414 | return -ENOMEM; | |
415 | } | |
416 | ||
417 | driver->dmsg_handler = nlmsg_handler; | |
418 | driver->devt_handler = nlevt_handler; | |
419 | driver->hostt = hostt; | |
420 | driver->vendor_id = vendor_id; | |
421 | ||
422 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
423 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
424 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
425 | msleep(1); | |
426 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
427 | } | |
428 | list_add_tail(&driver->next, &scsi_nl_drivers); | |
429 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
430 | ||
431 | return 0; | |
432 | } | |
433 | EXPORT_SYMBOL_GPL(scsi_nl_add_driver); | |
434 | ||
435 | ||
436 | /** | |
437 | * scsi_nl_remove_driver - | |
438 | * An driver is unregistering with the SCSI netlink messages | |
439 | * | |
440 | * @vendor_id: The unique identification value for the driver. | |
441 | **/ | |
442 | void | |
443 | scsi_nl_remove_driver(u64 vendor_id) | |
444 | { | |
445 | struct scsi_nl_drvr *driver; | |
446 | unsigned long flags; | |
447 | ||
448 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
449 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
450 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
451 | msleep(1); | |
452 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
453 | } | |
454 | ||
455 | list_for_each_entry(driver, &scsi_nl_drivers, next) { | |
456 | if (driver->vendor_id == vendor_id) { | |
457 | driver->flags |= HANDLER_DELETING; | |
458 | while (driver->refcnt != 0) { | |
459 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
460 | schedule_timeout_uninterruptible(HZ/4); | |
461 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
462 | } | |
463 | list_del(&driver->next); | |
464 | kfree(driver); | |
465 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
466 | return; | |
467 | } | |
468 | } | |
469 | ||
470 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
471 | ||
472 | printk(KERN_ERR "%s: removal of driver failed - vendor_id 0x%llx\n", | |
473 | __func__, (unsigned long long)vendor_id); | |
474 | return; | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(scsi_nl_remove_driver); | |
477 | ||
478 | ||
479 | /** | |
b595076a | 480 | * scsi_netlink_init - Called by SCSI subsystem to initialize |
22447be7 | 481 | * the SCSI transport netlink interface |
84314fd4 JS |
482 | * |
483 | **/ | |
484 | void | |
485 | scsi_netlink_init(void) | |
486 | { | |
487 | int error; | |
488 | ||
22447be7 JS |
489 | INIT_LIST_HEAD(&scsi_nl_drivers); |
490 | ||
84314fd4 JS |
491 | error = netlink_register_notifier(&scsi_netlink_notifier); |
492 | if (error) { | |
493 | printk(KERN_ERR "%s: register of event handler failed - %d\n", | |
cadbd4a5 | 494 | __func__, error); |
84314fd4 JS |
495 | return; |
496 | } | |
497 | ||
b4b51029 | 498 | scsi_nl_sock = netlink_kernel_create(&init_net, NETLINK_SCSITRANSPORT, |
cd40b7d3 | 499 | SCSI_NL_GRP_CNT, scsi_nl_rcv_msg, NULL, |
af65bdfc | 500 | THIS_MODULE); |
84314fd4 JS |
501 | if (!scsi_nl_sock) { |
502 | printk(KERN_ERR "%s: register of recieve handler failed\n", | |
cadbd4a5 | 503 | __func__); |
84314fd4 | 504 | netlink_unregister_notifier(&scsi_netlink_notifier); |
22447be7 | 505 | return; |
84314fd4 JS |
506 | } |
507 | ||
22447be7 JS |
508 | /* Register the entry points for the generic SCSI transport */ |
509 | error = scsi_nl_add_transport(SCSI_NL_TRANSPORT, | |
510 | scsi_generic_msg_handler, NULL); | |
511 | if (error) | |
512 | printk(KERN_ERR "%s: register of GENERIC transport handler" | |
513 | " failed - %d\n", __func__, error); | |
84314fd4 JS |
514 | return; |
515 | } | |
516 | ||
517 | ||
518 | /** | |
eb44820c | 519 | * scsi_netlink_exit - Called by SCSI subsystem to disable the SCSI transport netlink interface |
84314fd4 JS |
520 | * |
521 | **/ | |
522 | void | |
523 | scsi_netlink_exit(void) | |
524 | { | |
22447be7 JS |
525 | scsi_nl_remove_transport(SCSI_NL_TRANSPORT); |
526 | ||
84314fd4 | 527 | if (scsi_nl_sock) { |
b7c6ba6e | 528 | netlink_kernel_release(scsi_nl_sock); |
84314fd4 JS |
529 | netlink_unregister_notifier(&scsi_netlink_notifier); |
530 | } | |
531 | ||
532 | return; | |
533 | } | |
534 | ||
535 | ||
22447be7 JS |
536 | /* |
537 | * Exported Interfaces | |
538 | */ | |
539 | ||
540 | /** | |
541 | * scsi_nl_send_transport_msg - | |
542 | * Generic function to send a single message from a SCSI transport to | |
543 | * a single process | |
544 | * | |
545 | * @pid: receiving pid | |
546 | * @hdr: message payload | |
547 | * | |
548 | **/ | |
549 | void | |
550 | scsi_nl_send_transport_msg(u32 pid, struct scsi_nl_hdr *hdr) | |
551 | { | |
552 | struct sk_buff *skb; | |
553 | struct nlmsghdr *nlh; | |
554 | const char *fn; | |
555 | char *datab; | |
556 | u32 len, skblen; | |
557 | int err; | |
558 | ||
559 | if (!scsi_nl_sock) { | |
560 | err = -ENOENT; | |
561 | fn = "netlink socket"; | |
562 | goto msg_fail; | |
563 | } | |
564 | ||
565 | len = NLMSG_SPACE(hdr->msglen); | |
566 | skblen = NLMSG_SPACE(len); | |
567 | ||
568 | skb = alloc_skb(skblen, GFP_KERNEL); | |
569 | if (!skb) { | |
570 | err = -ENOBUFS; | |
571 | fn = "alloc_skb"; | |
572 | goto msg_fail; | |
573 | } | |
574 | ||
575 | nlh = nlmsg_put(skb, pid, 0, SCSI_TRANSPORT_MSG, len - sizeof(*nlh), 0); | |
576 | if (!nlh) { | |
577 | err = -ENOBUFS; | |
578 | fn = "nlmsg_put"; | |
579 | goto msg_fail_skb; | |
580 | } | |
581 | datab = NLMSG_DATA(nlh); | |
582 | memcpy(datab, hdr, hdr->msglen); | |
583 | ||
584 | err = nlmsg_unicast(scsi_nl_sock, skb, pid); | |
585 | if (err < 0) { | |
586 | fn = "nlmsg_unicast"; | |
587 | /* nlmsg_unicast already kfree_skb'd */ | |
588 | goto msg_fail; | |
589 | } | |
590 | ||
591 | return; | |
592 | ||
593 | msg_fail_skb: | |
594 | kfree_skb(skb); | |
595 | msg_fail: | |
596 | printk(KERN_WARNING | |
597 | "%s: Dropped Message : pid %d Transport %d, msgtype x%x, " | |
598 | "msglen %d: %s : err %d\n", | |
599 | __func__, pid, hdr->transport, hdr->msgtype, hdr->msglen, | |
600 | fn, err); | |
601 | return; | |
602 | } | |
603 | EXPORT_SYMBOL_GPL(scsi_nl_send_transport_msg); | |
604 | ||
605 | ||
606 | /** | |
607 | * scsi_nl_send_vendor_msg - called to send a shost vendor unique message | |
608 | * to a specific process id. | |
609 | * | |
610 | * @pid: process id of the receiver | |
611 | * @host_no: host # sending the message | |
612 | * @vendor_id: unique identifier for the driver's vendor | |
613 | * @data_len: amount, in bytes, of vendor unique payload data | |
614 | * @data_buf: pointer to vendor unique data buffer | |
615 | * | |
616 | * Returns: | |
af901ca1 | 617 | * 0 on successful return |
22447be7 JS |
618 | * otherwise, failing error code |
619 | * | |
620 | * Notes: | |
621 | * This routine assumes no locks are held on entry. | |
622 | */ | |
623 | int | |
624 | scsi_nl_send_vendor_msg(u32 pid, unsigned short host_no, u64 vendor_id, | |
625 | char *data_buf, u32 data_len) | |
626 | { | |
627 | struct sk_buff *skb; | |
628 | struct nlmsghdr *nlh; | |
629 | struct scsi_nl_host_vendor_msg *msg; | |
630 | u32 len, skblen; | |
631 | int err; | |
632 | ||
633 | if (!scsi_nl_sock) { | |
634 | err = -ENOENT; | |
635 | goto send_vendor_fail; | |
636 | } | |
637 | ||
638 | len = SCSI_NL_MSGALIGN(sizeof(*msg) + data_len); | |
639 | skblen = NLMSG_SPACE(len); | |
640 | ||
641 | skb = alloc_skb(skblen, GFP_KERNEL); | |
642 | if (!skb) { | |
643 | err = -ENOBUFS; | |
644 | goto send_vendor_fail; | |
645 | } | |
646 | ||
647 | nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, | |
648 | skblen - sizeof(*nlh), 0); | |
649 | if (!nlh) { | |
650 | err = -ENOBUFS; | |
651 | goto send_vendor_fail_skb; | |
652 | } | |
653 | msg = NLMSG_DATA(nlh); | |
654 | ||
655 | INIT_SCSI_NL_HDR(&msg->snlh, SCSI_NL_TRANSPORT, | |
656 | SCSI_NL_SHOST_VENDOR, len); | |
657 | msg->vendor_id = vendor_id; | |
658 | msg->host_no = host_no; | |
659 | msg->vmsg_datalen = data_len; /* bytes */ | |
660 | memcpy(&msg[1], data_buf, data_len); | |
661 | ||
662 | err = nlmsg_unicast(scsi_nl_sock, skb, pid); | |
663 | if (err) | |
664 | /* nlmsg_multicast already kfree_skb'd */ | |
665 | goto send_vendor_fail; | |
666 | ||
667 | return 0; | |
668 | ||
669 | send_vendor_fail_skb: | |
670 | kfree_skb(skb); | |
671 | send_vendor_fail: | |
672 | printk(KERN_WARNING | |
673 | "%s: Dropped SCSI Msg : host %d vendor_unique - err %d\n", | |
674 | __func__, host_no, err); | |
675 | return err; | |
676 | } | |
677 | EXPORT_SYMBOL(scsi_nl_send_vendor_msg); | |
678 | ||
679 |