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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> |
09703660 | 26 | #include <linux/export.h> |
84314fd4 JS |
27 | #include <net/sock.h> |
28 | #include <net/netlink.h> | |
29 | ||
30 | #include <scsi/scsi_netlink.h> | |
31 | #include "scsi_priv.h" | |
32 | ||
33 | struct sock *scsi_nl_sock = NULL; | |
34 | EXPORT_SYMBOL_GPL(scsi_nl_sock); | |
35 | ||
22447be7 JS |
36 | static DEFINE_SPINLOCK(scsi_nl_lock); |
37 | static struct list_head scsi_nl_drivers; | |
38 | ||
39 | static u32 scsi_nl_state; | |
40 | #define STATE_EHANDLER_BSY 0x00000001 | |
41 | ||
42 | struct scsi_nl_transport { | |
43 | int (*msg_handler)(struct sk_buff *); | |
44 | void (*event_handler)(struct notifier_block *, unsigned long, void *); | |
45 | unsigned int refcnt; | |
46 | int flags; | |
47 | }; | |
48 | ||
49 | /* flags values (bit flags) */ | |
50 | #define HANDLER_DELETING 0x1 | |
51 | ||
52 | static struct scsi_nl_transport transports[SCSI_NL_MAX_TRANSPORTS] = | |
53 | { {NULL, }, }; | |
54 | ||
55 | ||
56 | struct scsi_nl_drvr { | |
57 | struct list_head next; | |
58 | int (*dmsg_handler)(struct Scsi_Host *shost, void *payload, | |
59 | u32 len, u32 pid); | |
60 | void (*devt_handler)(struct notifier_block *nb, | |
61 | unsigned long event, void *notify_ptr); | |
62 | struct scsi_host_template *hostt; | |
63 | u64 vendor_id; | |
64 | unsigned int refcnt; | |
65 | int flags; | |
66 | }; | |
67 | ||
68 | ||
84314fd4 JS |
69 | |
70 | /** | |
eb44820c RL |
71 | * scsi_nl_rcv_msg - Receive message handler. |
72 | * @skb: socket receive buffer | |
73 | * | |
74 | * Description: Extracts message from a receive buffer. | |
84314fd4 JS |
75 | * Validates message header and calls appropriate transport message handler |
76 | * | |
84314fd4 JS |
77 | * |
78 | **/ | |
79 | static void | |
80 | scsi_nl_rcv_msg(struct sk_buff *skb) | |
81 | { | |
82 | struct nlmsghdr *nlh; | |
83 | struct scsi_nl_hdr *hdr; | |
22447be7 JS |
84 | unsigned long flags; |
85 | u32 rlen; | |
86 | int err, tport; | |
84314fd4 JS |
87 | |
88 | while (skb->len >= NLMSG_SPACE(0)) { | |
89 | err = 0; | |
90 | ||
b529ccf2 | 91 | nlh = nlmsg_hdr(skb); |
84314fd4 JS |
92 | if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) || |
93 | (skb->len < nlh->nlmsg_len)) { | |
94 | printk(KERN_WARNING "%s: discarding partial skb\n", | |
cadbd4a5 | 95 | __func__); |
84314fd4 JS |
96 | return; |
97 | } | |
98 | ||
99 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
100 | if (rlen > skb->len) | |
101 | rlen = skb->len; | |
102 | ||
103 | if (nlh->nlmsg_type != SCSI_TRANSPORT_MSG) { | |
104 | err = -EBADMSG; | |
22447be7 | 105 | goto next_msg; |
84314fd4 JS |
106 | } |
107 | ||
108 | hdr = NLMSG_DATA(nlh); | |
109 | if ((hdr->version != SCSI_NL_VERSION) || | |
110 | (hdr->magic != SCSI_NL_MAGIC)) { | |
111 | err = -EPROTOTYPE; | |
112 | goto next_msg; | |
113 | } | |
114 | ||
fd778461 | 115 | if (!capable(CAP_SYS_ADMIN)) { |
84314fd4 JS |
116 | err = -EPERM; |
117 | goto next_msg; | |
118 | } | |
119 | ||
120 | if (nlh->nlmsg_len < (sizeof(*nlh) + hdr->msglen)) { | |
121 | printk(KERN_WARNING "%s: discarding partial message\n", | |
cadbd4a5 | 122 | __func__); |
22447be7 | 123 | goto next_msg; |
84314fd4 JS |
124 | } |
125 | ||
126 | /* | |
22447be7 | 127 | * Deliver message to the appropriate transport |
84314fd4 | 128 | */ |
22447be7 JS |
129 | spin_lock_irqsave(&scsi_nl_lock, flags); |
130 | ||
131 | tport = hdr->transport; | |
132 | if ((tport < SCSI_NL_MAX_TRANSPORTS) && | |
133 | !(transports[tport].flags & HANDLER_DELETING) && | |
134 | (transports[tport].msg_handler)) { | |
135 | transports[tport].refcnt++; | |
136 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
137 | err = transports[tport].msg_handler(skb); | |
138 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
139 | transports[tport].refcnt--; | |
140 | } else | |
141 | err = -ENOENT; | |
142 | ||
143 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
84314fd4 JS |
144 | |
145 | next_msg: | |
146 | if ((err) || (nlh->nlmsg_flags & NLM_F_ACK)) | |
147 | netlink_ack(skb, nlh, err); | |
148 | ||
149 | skb_pull(skb, rlen); | |
150 | } | |
151 | } | |
152 | ||
153 | ||
84314fd4 | 154 | /** |
eb44820c | 155 | * scsi_nl_rcv_event - Event handler for a netlink socket. |
84314fd4 JS |
156 | * @this: event notifier block |
157 | * @event: event type | |
158 | * @ptr: event payload | |
159 | * | |
160 | **/ | |
161 | static int | |
162 | scsi_nl_rcv_event(struct notifier_block *this, unsigned long event, void *ptr) | |
163 | { | |
164 | struct netlink_notify *n = ptr; | |
22447be7 JS |
165 | struct scsi_nl_drvr *driver; |
166 | unsigned long flags; | |
167 | int tport; | |
84314fd4 JS |
168 | |
169 | if (n->protocol != NETLINK_SCSITRANSPORT) | |
170 | return NOTIFY_DONE; | |
171 | ||
22447be7 JS |
172 | spin_lock_irqsave(&scsi_nl_lock, flags); |
173 | scsi_nl_state |= STATE_EHANDLER_BSY; | |
174 | ||
84314fd4 | 175 | /* |
22447be7 | 176 | * Pass event on to any transports that may be listening |
84314fd4 | 177 | */ |
22447be7 JS |
178 | for (tport = 0; tport < SCSI_NL_MAX_TRANSPORTS; tport++) { |
179 | if (!(transports[tport].flags & HANDLER_DELETING) && | |
180 | (transports[tport].event_handler)) { | |
181 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
182 | transports[tport].event_handler(this, event, ptr); | |
183 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
184 | } | |
185 | } | |
186 | ||
187 | /* | |
188 | * Pass event on to any drivers that may be listening | |
189 | */ | |
190 | list_for_each_entry(driver, &scsi_nl_drivers, next) { | |
191 | if (!(driver->flags & HANDLER_DELETING) && | |
192 | (driver->devt_handler)) { | |
193 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
194 | driver->devt_handler(this, event, ptr); | |
195 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
196 | } | |
197 | } | |
198 | ||
199 | scsi_nl_state &= ~STATE_EHANDLER_BSY; | |
200 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
84314fd4 JS |
201 | |
202 | return NOTIFY_DONE; | |
203 | } | |
204 | ||
205 | static struct notifier_block scsi_netlink_notifier = { | |
206 | .notifier_call = scsi_nl_rcv_event, | |
207 | }; | |
208 | ||
209 | ||
aa198bf1 | 210 | /* |
22447be7 | 211 | * GENERIC SCSI transport receive and event handlers |
aa198bf1 | 212 | */ |
22447be7 JS |
213 | |
214 | /** | |
aa198bf1 | 215 | * scsi_generic_msg_handler - receive message handler for GENERIC transport messages |
22447be7 | 216 | * @skb: socket receive buffer |
22447be7 JS |
217 | **/ |
218 | static int | |
219 | scsi_generic_msg_handler(struct sk_buff *skb) | |
220 | { | |
221 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
222 | struct scsi_nl_hdr *snlh = NLMSG_DATA(nlh); | |
223 | struct scsi_nl_drvr *driver; | |
224 | struct Scsi_Host *shost; | |
225 | unsigned long flags; | |
226 | int err = 0, match, pid; | |
227 | ||
228 | pid = NETLINK_CREDS(skb)->pid; | |
229 | ||
230 | switch (snlh->msgtype) { | |
231 | case SCSI_NL_SHOST_VENDOR: | |
232 | { | |
233 | struct scsi_nl_host_vendor_msg *msg = NLMSG_DATA(nlh); | |
234 | ||
235 | /* Locate the driver that corresponds to the message */ | |
236 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
237 | match = 0; | |
238 | list_for_each_entry(driver, &scsi_nl_drivers, next) { | |
239 | if (driver->vendor_id == msg->vendor_id) { | |
240 | match = 1; | |
241 | break; | |
242 | } | |
243 | } | |
244 | ||
245 | if ((!match) || (!driver->dmsg_handler)) { | |
246 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
247 | err = -ESRCH; | |
248 | goto rcv_exit; | |
249 | } | |
250 | ||
251 | if (driver->flags & HANDLER_DELETING) { | |
252 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
253 | err = -ESHUTDOWN; | |
254 | goto rcv_exit; | |
255 | } | |
256 | ||
257 | driver->refcnt++; | |
258 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
259 | ||
260 | ||
261 | /* if successful, scsi_host_lookup takes a shost reference */ | |
262 | shost = scsi_host_lookup(msg->host_no); | |
263 | if (!shost) { | |
264 | err = -ENODEV; | |
265 | goto driver_exit; | |
266 | } | |
267 | ||
268 | /* is this host owned by the vendor ? */ | |
269 | if (shost->hostt != driver->hostt) { | |
270 | err = -EINVAL; | |
271 | goto vendormsg_put; | |
272 | } | |
273 | ||
274 | /* pass message on to the driver */ | |
275 | err = driver->dmsg_handler(shost, (void *)&msg[1], | |
276 | msg->vmsg_datalen, pid); | |
277 | ||
278 | vendormsg_put: | |
279 | /* release reference by scsi_host_lookup */ | |
280 | scsi_host_put(shost); | |
281 | ||
282 | driver_exit: | |
283 | /* release our own reference on the registration object */ | |
284 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
285 | driver->refcnt--; | |
286 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
287 | break; | |
288 | } | |
289 | ||
290 | default: | |
291 | err = -EBADR; | |
292 | break; | |
293 | } | |
294 | ||
295 | rcv_exit: | |
296 | if (err) | |
297 | printk(KERN_WARNING "%s: Msgtype %d failed - err %d\n", | |
298 | __func__, snlh->msgtype, err); | |
299 | return err; | |
300 | } | |
301 | ||
302 | ||
303 | /** | |
304 | * scsi_nl_add_transport - | |
305 | * Registers message and event handlers for a transport. Enables | |
306 | * receipt of netlink messages and events to a transport. | |
307 | * | |
308 | * @tport: transport registering handlers | |
309 | * @msg_handler: receive message handler callback | |
310 | * @event_handler: receive event handler callback | |
311 | **/ | |
312 | int | |
313 | scsi_nl_add_transport(u8 tport, | |
314 | int (*msg_handler)(struct sk_buff *), | |
315 | void (*event_handler)(struct notifier_block *, unsigned long, void *)) | |
316 | { | |
317 | unsigned long flags; | |
318 | int err = 0; | |
319 | ||
320 | if (tport >= SCSI_NL_MAX_TRANSPORTS) | |
321 | return -EINVAL; | |
322 | ||
323 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
324 | ||
325 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
326 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
327 | msleep(1); | |
328 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
329 | } | |
330 | ||
331 | if (transports[tport].msg_handler || transports[tport].event_handler) { | |
332 | err = -EALREADY; | |
333 | goto register_out; | |
334 | } | |
335 | ||
336 | transports[tport].msg_handler = msg_handler; | |
337 | transports[tport].event_handler = event_handler; | |
338 | transports[tport].flags = 0; | |
339 | transports[tport].refcnt = 0; | |
340 | ||
341 | register_out: | |
342 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
343 | ||
344 | return err; | |
345 | } | |
346 | EXPORT_SYMBOL_GPL(scsi_nl_add_transport); | |
347 | ||
348 | ||
349 | /** | |
350 | * scsi_nl_remove_transport - | |
351 | * Disable transport receiption of messages and events | |
352 | * | |
353 | * @tport: transport deregistering handlers | |
354 | * | |
355 | **/ | |
356 | void | |
357 | scsi_nl_remove_transport(u8 tport) | |
358 | { | |
359 | unsigned long flags; | |
360 | ||
361 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
362 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
363 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
364 | msleep(1); | |
365 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
366 | } | |
367 | ||
368 | if (tport < SCSI_NL_MAX_TRANSPORTS) { | |
369 | transports[tport].flags |= HANDLER_DELETING; | |
370 | ||
371 | while (transports[tport].refcnt != 0) { | |
372 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
373 | schedule_timeout_uninterruptible(HZ/4); | |
374 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
375 | } | |
376 | transports[tport].msg_handler = NULL; | |
377 | transports[tport].event_handler = NULL; | |
378 | transports[tport].flags = 0; | |
379 | } | |
380 | ||
381 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
382 | ||
383 | return; | |
384 | } | |
385 | EXPORT_SYMBOL_GPL(scsi_nl_remove_transport); | |
386 | ||
387 | ||
388 | /** | |
389 | * scsi_nl_add_driver - | |
390 | * A driver is registering its interfaces for SCSI netlink messages | |
391 | * | |
392 | * @vendor_id: A unique identification value for the driver. | |
393 | * @hostt: address of the driver's host template. Used | |
394 | * to verify an shost is bound to the driver | |
395 | * @nlmsg_handler: receive message handler callback | |
396 | * @nlevt_handler: receive event handler callback | |
397 | * | |
398 | * Returns: | |
399 | * 0 on Success | |
400 | * error result otherwise | |
401 | **/ | |
402 | int | |
403 | scsi_nl_add_driver(u64 vendor_id, struct scsi_host_template *hostt, | |
404 | int (*nlmsg_handler)(struct Scsi_Host *shost, void *payload, | |
405 | u32 len, u32 pid), | |
406 | void (*nlevt_handler)(struct notifier_block *nb, | |
407 | unsigned long event, void *notify_ptr)) | |
408 | { | |
409 | struct scsi_nl_drvr *driver; | |
410 | unsigned long flags; | |
411 | ||
412 | driver = kzalloc(sizeof(*driver), GFP_KERNEL); | |
413 | if (unlikely(!driver)) { | |
414 | printk(KERN_ERR "%s: allocation failure\n", __func__); | |
415 | return -ENOMEM; | |
416 | } | |
417 | ||
418 | driver->dmsg_handler = nlmsg_handler; | |
419 | driver->devt_handler = nlevt_handler; | |
420 | driver->hostt = hostt; | |
421 | driver->vendor_id = vendor_id; | |
422 | ||
423 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
424 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
425 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
426 | msleep(1); | |
427 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
428 | } | |
429 | list_add_tail(&driver->next, &scsi_nl_drivers); | |
430 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
431 | ||
432 | return 0; | |
433 | } | |
434 | EXPORT_SYMBOL_GPL(scsi_nl_add_driver); | |
435 | ||
436 | ||
437 | /** | |
438 | * scsi_nl_remove_driver - | |
439 | * An driver is unregistering with the SCSI netlink messages | |
440 | * | |
441 | * @vendor_id: The unique identification value for the driver. | |
442 | **/ | |
443 | void | |
444 | scsi_nl_remove_driver(u64 vendor_id) | |
445 | { | |
446 | struct scsi_nl_drvr *driver; | |
447 | unsigned long flags; | |
448 | ||
449 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
450 | if (scsi_nl_state & STATE_EHANDLER_BSY) { | |
451 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
452 | msleep(1); | |
453 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
454 | } | |
455 | ||
456 | list_for_each_entry(driver, &scsi_nl_drivers, next) { | |
457 | if (driver->vendor_id == vendor_id) { | |
458 | driver->flags |= HANDLER_DELETING; | |
459 | while (driver->refcnt != 0) { | |
460 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
461 | schedule_timeout_uninterruptible(HZ/4); | |
462 | spin_lock_irqsave(&scsi_nl_lock, flags); | |
463 | } | |
464 | list_del(&driver->next); | |
465 | kfree(driver); | |
466 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
467 | return; | |
468 | } | |
469 | } | |
470 | ||
471 | spin_unlock_irqrestore(&scsi_nl_lock, flags); | |
472 | ||
473 | printk(KERN_ERR "%s: removal of driver failed - vendor_id 0x%llx\n", | |
474 | __func__, (unsigned long long)vendor_id); | |
475 | return; | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(scsi_nl_remove_driver); | |
478 | ||
479 | ||
480 | /** | |
b595076a | 481 | * scsi_netlink_init - Called by SCSI subsystem to initialize |
22447be7 | 482 | * the SCSI transport netlink interface |
84314fd4 JS |
483 | * |
484 | **/ | |
485 | void | |
486 | scsi_netlink_init(void) | |
487 | { | |
488 | int error; | |
489 | ||
22447be7 JS |
490 | INIT_LIST_HEAD(&scsi_nl_drivers); |
491 | ||
84314fd4 JS |
492 | error = netlink_register_notifier(&scsi_netlink_notifier); |
493 | if (error) { | |
494 | printk(KERN_ERR "%s: register of event handler failed - %d\n", | |
cadbd4a5 | 495 | __func__, error); |
84314fd4 JS |
496 | return; |
497 | } | |
498 | ||
b4b51029 | 499 | scsi_nl_sock = netlink_kernel_create(&init_net, NETLINK_SCSITRANSPORT, |
cd40b7d3 | 500 | SCSI_NL_GRP_CNT, scsi_nl_rcv_msg, NULL, |
af65bdfc | 501 | THIS_MODULE); |
84314fd4 | 502 | if (!scsi_nl_sock) { |
25985edc | 503 | printk(KERN_ERR "%s: register of receive handler failed\n", |
cadbd4a5 | 504 | __func__); |
84314fd4 | 505 | netlink_unregister_notifier(&scsi_netlink_notifier); |
22447be7 | 506 | return; |
84314fd4 JS |
507 | } |
508 | ||
22447be7 JS |
509 | /* Register the entry points for the generic SCSI transport */ |
510 | error = scsi_nl_add_transport(SCSI_NL_TRANSPORT, | |
511 | scsi_generic_msg_handler, NULL); | |
512 | if (error) | |
513 | printk(KERN_ERR "%s: register of GENERIC transport handler" | |
514 | " failed - %d\n", __func__, error); | |
84314fd4 JS |
515 | return; |
516 | } | |
517 | ||
518 | ||
519 | /** | |
eb44820c | 520 | * scsi_netlink_exit - Called by SCSI subsystem to disable the SCSI transport netlink interface |
84314fd4 JS |
521 | * |
522 | **/ | |
523 | void | |
524 | scsi_netlink_exit(void) | |
525 | { | |
22447be7 JS |
526 | scsi_nl_remove_transport(SCSI_NL_TRANSPORT); |
527 | ||
84314fd4 | 528 | if (scsi_nl_sock) { |
b7c6ba6e | 529 | netlink_kernel_release(scsi_nl_sock); |
84314fd4 JS |
530 | netlink_unregister_notifier(&scsi_netlink_notifier); |
531 | } | |
532 | ||
533 | return; | |
534 | } | |
535 | ||
536 | ||
22447be7 JS |
537 | /* |
538 | * Exported Interfaces | |
539 | */ | |
540 | ||
541 | /** | |
542 | * scsi_nl_send_transport_msg - | |
543 | * Generic function to send a single message from a SCSI transport to | |
544 | * a single process | |
545 | * | |
546 | * @pid: receiving pid | |
547 | * @hdr: message payload | |
548 | * | |
549 | **/ | |
550 | void | |
551 | scsi_nl_send_transport_msg(u32 pid, struct scsi_nl_hdr *hdr) | |
552 | { | |
553 | struct sk_buff *skb; | |
554 | struct nlmsghdr *nlh; | |
555 | const char *fn; | |
556 | char *datab; | |
557 | u32 len, skblen; | |
558 | int err; | |
559 | ||
560 | if (!scsi_nl_sock) { | |
561 | err = -ENOENT; | |
562 | fn = "netlink socket"; | |
563 | goto msg_fail; | |
564 | } | |
565 | ||
566 | len = NLMSG_SPACE(hdr->msglen); | |
567 | skblen = NLMSG_SPACE(len); | |
568 | ||
569 | skb = alloc_skb(skblen, GFP_KERNEL); | |
570 | if (!skb) { | |
571 | err = -ENOBUFS; | |
572 | fn = "alloc_skb"; | |
573 | goto msg_fail; | |
574 | } | |
575 | ||
576 | nlh = nlmsg_put(skb, pid, 0, SCSI_TRANSPORT_MSG, len - sizeof(*nlh), 0); | |
577 | if (!nlh) { | |
578 | err = -ENOBUFS; | |
579 | fn = "nlmsg_put"; | |
580 | goto msg_fail_skb; | |
581 | } | |
582 | datab = NLMSG_DATA(nlh); | |
583 | memcpy(datab, hdr, hdr->msglen); | |
584 | ||
585 | err = nlmsg_unicast(scsi_nl_sock, skb, pid); | |
586 | if (err < 0) { | |
587 | fn = "nlmsg_unicast"; | |
588 | /* nlmsg_unicast already kfree_skb'd */ | |
589 | goto msg_fail; | |
590 | } | |
591 | ||
592 | return; | |
593 | ||
594 | msg_fail_skb: | |
595 | kfree_skb(skb); | |
596 | msg_fail: | |
597 | printk(KERN_WARNING | |
598 | "%s: Dropped Message : pid %d Transport %d, msgtype x%x, " | |
599 | "msglen %d: %s : err %d\n", | |
600 | __func__, pid, hdr->transport, hdr->msgtype, hdr->msglen, | |
601 | fn, err); | |
602 | return; | |
603 | } | |
604 | EXPORT_SYMBOL_GPL(scsi_nl_send_transport_msg); | |
605 | ||
606 | ||
607 | /** | |
608 | * scsi_nl_send_vendor_msg - called to send a shost vendor unique message | |
609 | * to a specific process id. | |
610 | * | |
611 | * @pid: process id of the receiver | |
612 | * @host_no: host # sending the message | |
613 | * @vendor_id: unique identifier for the driver's vendor | |
614 | * @data_len: amount, in bytes, of vendor unique payload data | |
615 | * @data_buf: pointer to vendor unique data buffer | |
616 | * | |
617 | * Returns: | |
af901ca1 | 618 | * 0 on successful return |
22447be7 JS |
619 | * otherwise, failing error code |
620 | * | |
621 | * Notes: | |
622 | * This routine assumes no locks are held on entry. | |
623 | */ | |
624 | int | |
625 | scsi_nl_send_vendor_msg(u32 pid, unsigned short host_no, u64 vendor_id, | |
626 | char *data_buf, u32 data_len) | |
627 | { | |
628 | struct sk_buff *skb; | |
629 | struct nlmsghdr *nlh; | |
630 | struct scsi_nl_host_vendor_msg *msg; | |
631 | u32 len, skblen; | |
632 | int err; | |
633 | ||
634 | if (!scsi_nl_sock) { | |
635 | err = -ENOENT; | |
636 | goto send_vendor_fail; | |
637 | } | |
638 | ||
639 | len = SCSI_NL_MSGALIGN(sizeof(*msg) + data_len); | |
640 | skblen = NLMSG_SPACE(len); | |
641 | ||
642 | skb = alloc_skb(skblen, GFP_KERNEL); | |
643 | if (!skb) { | |
644 | err = -ENOBUFS; | |
645 | goto send_vendor_fail; | |
646 | } | |
647 | ||
648 | nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, | |
649 | skblen - sizeof(*nlh), 0); | |
650 | if (!nlh) { | |
651 | err = -ENOBUFS; | |
652 | goto send_vendor_fail_skb; | |
653 | } | |
654 | msg = NLMSG_DATA(nlh); | |
655 | ||
656 | INIT_SCSI_NL_HDR(&msg->snlh, SCSI_NL_TRANSPORT, | |
657 | SCSI_NL_SHOST_VENDOR, len); | |
658 | msg->vendor_id = vendor_id; | |
659 | msg->host_no = host_no; | |
660 | msg->vmsg_datalen = data_len; /* bytes */ | |
661 | memcpy(&msg[1], data_buf, data_len); | |
662 | ||
663 | err = nlmsg_unicast(scsi_nl_sock, skb, pid); | |
664 | if (err) | |
665 | /* nlmsg_multicast already kfree_skb'd */ | |
666 | goto send_vendor_fail; | |
667 | ||
668 | return 0; | |
669 | ||
670 | send_vendor_fail_skb: | |
671 | kfree_skb(skb); | |
672 | send_vendor_fail: | |
673 | printk(KERN_WARNING | |
674 | "%s: Dropped SCSI Msg : host %d vendor_unique - err %d\n", | |
675 | __func__, host_no, err); | |
676 | return err; | |
677 | } | |
678 | EXPORT_SYMBOL(scsi_nl_send_vendor_msg); | |
679 | ||
680 |