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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2017 Linaro Ltd.
4 */
5#include <linux/kernel.h>
6#include <linux/module.h>
7#include <linux/device.h>
8#include <linux/qrtr.h>
9#include <linux/net.h>
10#include <linux/completion.h>
11#include <linux/idr.h>
12#include <linux/string.h>
13#include <net/sock.h>
14#include <linux/workqueue.h>
15#include <linux/soc/qcom/qmi.h>
16
17static struct socket *qmi_sock_create(struct qmi_handle *qmi,
18 struct sockaddr_qrtr *sq);
19
20/**
21 * qmi_recv_new_server() - handler of NEW_SERVER control message
22 * @qmi: qmi handle
23 * @service: service id of the new server
24 * @instance: instance id of the new server
25 * @node: node of the new server
26 * @port: port of the new server
27 *
28 * Calls the new_server callback to inform the client about a newly registered
29 * server matching the currently registered service lookup.
30 */
31static void qmi_recv_new_server(struct qmi_handle *qmi,
32 unsigned int service, unsigned int instance,
33 unsigned int node, unsigned int port)
34{
35 struct qmi_ops *ops = &qmi->ops;
36 struct qmi_service *svc;
37 int ret;
38
39 if (!ops->new_server)
40 return;
41
42 /* Ignore EOF marker */
43 if (!node && !port)
44 return;
45
46 svc = kzalloc(sizeof(*svc), GFP_KERNEL);
47 if (!svc)
48 return;
49
50 svc->service = service;
51 svc->version = instance & 0xff;
52 svc->instance = instance >> 8;
53 svc->node = node;
54 svc->port = port;
55
56 ret = ops->new_server(qmi, svc);
57 if (ret < 0)
58 kfree(svc);
59 else
60 list_add(&svc->list_node, &qmi->lookup_results);
61}
62
63/**
64 * qmi_recv_del_server() - handler of DEL_SERVER control message
65 * @qmi: qmi handle
66 * @node: node of the dying server, a value of -1 matches all nodes
67 * @port: port of the dying server, a value of -1 matches all ports
68 *
69 * Calls the del_server callback for each previously seen server, allowing the
70 * client to react to the disappearing server.
71 */
72static void qmi_recv_del_server(struct qmi_handle *qmi,
73 unsigned int node, unsigned int port)
74{
75 struct qmi_ops *ops = &qmi->ops;
76 struct qmi_service *svc;
77 struct qmi_service *tmp;
78
79 list_for_each_entry_safe(svc, tmp, &qmi->lookup_results, list_node) {
80 if (node != -1 && svc->node != node)
81 continue;
82 if (port != -1 && svc->port != port)
83 continue;
84
85 if (ops->del_server)
86 ops->del_server(qmi, svc);
87
88 list_del(&svc->list_node);
89 kfree(svc);
90 }
91}
92
93/**
94 * qmi_recv_bye() - handler of BYE control message
95 * @qmi: qmi handle
96 * @node: id of the dying node
97 *
98 * Signals the client that all previously registered services on this node are
99 * now gone and then calls the bye callback to allow the client further
100 * cleaning up resources associated with this remote.
101 */
102static void qmi_recv_bye(struct qmi_handle *qmi,
103 unsigned int node)
104{
105 struct qmi_ops *ops = &qmi->ops;
106
107 qmi_recv_del_server(qmi, node, -1);
108
109 if (ops->bye)
110 ops->bye(qmi, node);
111}
112
113/**
114 * qmi_recv_del_client() - handler of DEL_CLIENT control message
115 * @qmi: qmi handle
116 * @node: node of the dying client
117 * @port: port of the dying client
118 *
119 * Signals the client about a dying client, by calling the del_client callback.
120 */
121static void qmi_recv_del_client(struct qmi_handle *qmi,
122 unsigned int node, unsigned int port)
123{
124 struct qmi_ops *ops = &qmi->ops;
125
126 if (ops->del_client)
127 ops->del_client(qmi, node, port);
128}
129
130static void qmi_recv_ctrl_pkt(struct qmi_handle *qmi,
131 const void *buf, size_t len)
132{
133 const struct qrtr_ctrl_pkt *pkt = buf;
134
135 if (len < sizeof(struct qrtr_ctrl_pkt)) {
136 pr_debug("ignoring short control packet\n");
137 return;
138 }
139
140 switch (le32_to_cpu(pkt->cmd)) {
141 case QRTR_TYPE_BYE:
142 qmi_recv_bye(qmi, le32_to_cpu(pkt->client.node));
143 break;
144 case QRTR_TYPE_NEW_SERVER:
145 qmi_recv_new_server(qmi,
146 le32_to_cpu(pkt->server.service),
147 le32_to_cpu(pkt->server.instance),
148 le32_to_cpu(pkt->server.node),
149 le32_to_cpu(pkt->server.port));
150 break;
151 case QRTR_TYPE_DEL_SERVER:
152 qmi_recv_del_server(qmi,
153 le32_to_cpu(pkt->server.node),
154 le32_to_cpu(pkt->server.port));
155 break;
156 case QRTR_TYPE_DEL_CLIENT:
157 qmi_recv_del_client(qmi,
158 le32_to_cpu(pkt->client.node),
159 le32_to_cpu(pkt->client.port));
160 break;
161 }
162}
163
164static void qmi_send_new_lookup(struct qmi_handle *qmi, struct qmi_service *svc)
165{
166 struct qrtr_ctrl_pkt pkt;
167 struct sockaddr_qrtr sq;
168 struct msghdr msg = { };
169 struct kvec iv = { &pkt, sizeof(pkt) };
170 int ret;
171
172 memset(&pkt, 0, sizeof(pkt));
173 pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_LOOKUP);
174 pkt.server.service = cpu_to_le32(svc->service);
175 pkt.server.instance = cpu_to_le32(svc->version | svc->instance << 8);
176
177 sq.sq_family = qmi->sq.sq_family;
178 sq.sq_node = qmi->sq.sq_node;
179 sq.sq_port = QRTR_PORT_CTRL;
180
181 msg.msg_name = &sq;
182 msg.msg_namelen = sizeof(sq);
183
184 mutex_lock(&qmi->sock_lock);
185 if (qmi->sock) {
186 ret = kernel_sendmsg(qmi->sock, &msg, &iv, 1, sizeof(pkt));
187 if (ret < 0)
188 pr_err("failed to send lookup registration: %d\n", ret);
189 }
190 mutex_unlock(&qmi->sock_lock);
191}
192
193/**
194 * qmi_add_lookup() - register a new lookup with the name service
195 * @qmi: qmi handle
196 * @service: service id of the request
197 * @instance: instance id of the request
198 * @version: version number of the request
199 *
200 * Registering a lookup query with the name server will cause the name server
201 * to send NEW_SERVER and DEL_SERVER control messages to this socket as
202 * matching services are registered.
203 *
204 * Return: 0 on success, negative errno on failure.
205 */
206int qmi_add_lookup(struct qmi_handle *qmi, unsigned int service,
207 unsigned int version, unsigned int instance)
208{
209 struct qmi_service *svc;
210
211 svc = kzalloc(sizeof(*svc), GFP_KERNEL);
212 if (!svc)
213 return -ENOMEM;
214
215 svc->service = service;
216 svc->version = version;
217 svc->instance = instance;
218
219 list_add(&svc->list_node, &qmi->lookups);
220
221 qmi_send_new_lookup(qmi, svc);
222
223 return 0;
224}
225EXPORT_SYMBOL(qmi_add_lookup);
226
227static void qmi_send_new_server(struct qmi_handle *qmi, struct qmi_service *svc)
228{
229 struct qrtr_ctrl_pkt pkt;
230 struct sockaddr_qrtr sq;
231 struct msghdr msg = { };
232 struct kvec iv = { &pkt, sizeof(pkt) };
233 int ret;
234
235 memset(&pkt, 0, sizeof(pkt));
236 pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_SERVER);
237 pkt.server.service = cpu_to_le32(svc->service);
238 pkt.server.instance = cpu_to_le32(svc->version | svc->instance << 8);
239 pkt.server.node = cpu_to_le32(qmi->sq.sq_node);
240 pkt.server.port = cpu_to_le32(qmi->sq.sq_port);
241
242 sq.sq_family = qmi->sq.sq_family;
243 sq.sq_node = qmi->sq.sq_node;
244 sq.sq_port = QRTR_PORT_CTRL;
245
246 msg.msg_name = &sq;
247 msg.msg_namelen = sizeof(sq);
248
249 mutex_lock(&qmi->sock_lock);
250 if (qmi->sock) {
251 ret = kernel_sendmsg(qmi->sock, &msg, &iv, 1, sizeof(pkt));
252 if (ret < 0)
253 pr_err("send service registration failed: %d\n", ret);
254 }
255 mutex_unlock(&qmi->sock_lock);
256}
257
258/**
259 * qmi_add_server() - register a service with the name service
260 * @qmi: qmi handle
261 * @service: type of the service
262 * @instance: instance of the service
263 * @version: version of the service
264 *
265 * Register a new service with the name service. This allows clients to find
266 * and start sending messages to the client associated with @qmi.
267 *
268 * Return: 0 on success, negative errno on failure.
269 */
270int qmi_add_server(struct qmi_handle *qmi, unsigned int service,
271 unsigned int version, unsigned int instance)
272{
273 struct qmi_service *svc;
274
275 svc = kzalloc(sizeof(*svc), GFP_KERNEL);
276 if (!svc)
277 return -ENOMEM;
278
279 svc->service = service;
280 svc->version = version;
281 svc->instance = instance;
282
283 list_add(&svc->list_node, &qmi->services);
284
285 qmi_send_new_server(qmi, svc);
286
287 return 0;
288}
289EXPORT_SYMBOL(qmi_add_server);
290
291/**
292 * qmi_txn_init() - allocate transaction id within the given QMI handle
293 * @qmi: QMI handle
294 * @txn: transaction context
295 * @ei: description of how to decode a matching response (optional)
296 * @c_struct: pointer to the object to decode the response into (optional)
297 *
298 * This allocates a transaction id within the QMI handle. If @ei and @c_struct
299 * are specified any responses to this transaction will be decoded as described
300 * by @ei into @c_struct.
301 *
302 * A client calling qmi_txn_init() must call either qmi_txn_wait() or
303 * qmi_txn_cancel() to free up the allocated resources.
304 *
305 * Return: Transaction id on success, negative errno on failure.
306 */
307int qmi_txn_init(struct qmi_handle *qmi, struct qmi_txn *txn,
308 const struct qmi_elem_info *ei, void *c_struct)
309{
310 int ret;
311
312 memset(txn, 0, sizeof(*txn));
313
314 mutex_init(&txn->lock);
315 init_completion(&txn->completion);
316 txn->qmi = qmi;
317 txn->ei = ei;
318 txn->dest = c_struct;
319
320 mutex_lock(&qmi->txn_lock);
321 ret = idr_alloc_cyclic(&qmi->txns, txn, 0, U16_MAX, GFP_KERNEL);
322 if (ret < 0)
323 pr_err("failed to allocate transaction id\n");
324
325 txn->id = ret;
326 mutex_unlock(&qmi->txn_lock);
327
328 return ret;
329}
330EXPORT_SYMBOL(qmi_txn_init);
331
332/**
333 * qmi_txn_wait() - wait for a response on a transaction
334 * @txn: transaction handle
335 * @timeout: timeout, in jiffies
336 *
337 * If the transaction is decoded by the means of @ei and @c_struct the return
338 * value will be the returned value of qmi_decode_message(), otherwise it's up
339 * to the specified message handler to fill out the result.
340 *
341 * Return: the transaction response on success, negative errno on failure.
342 */
343int qmi_txn_wait(struct qmi_txn *txn, unsigned long timeout)
344{
345 struct qmi_handle *qmi = txn->qmi;
346 int ret;
347
348 ret = wait_for_completion_timeout(&txn->completion, timeout);
349
350 mutex_lock(&qmi->txn_lock);
351 mutex_lock(&txn->lock);
352 idr_remove(&qmi->txns, txn->id);
353 mutex_unlock(&txn->lock);
354 mutex_unlock(&qmi->txn_lock);
355
356 if (ret == 0)
357 return -ETIMEDOUT;
358 else
359 return txn->result;
360}
361EXPORT_SYMBOL(qmi_txn_wait);
362
363/**
364 * qmi_txn_cancel() - cancel an ongoing transaction
365 * @txn: transaction id
366 */
367void qmi_txn_cancel(struct qmi_txn *txn)
368{
369 struct qmi_handle *qmi = txn->qmi;
370
371 mutex_lock(&qmi->txn_lock);
372 mutex_lock(&txn->lock);
373 idr_remove(&qmi->txns, txn->id);
374 mutex_unlock(&txn->lock);
375 mutex_unlock(&qmi->txn_lock);
376}
377EXPORT_SYMBOL(qmi_txn_cancel);
378
379/**
380 * qmi_invoke_handler() - find and invoke a handler for a message
381 * @qmi: qmi handle
382 * @sq: sockaddr of the sender
383 * @txn: transaction object for the message
384 * @buf: buffer containing the message
385 * @len: length of @buf
386 *
387 * Find handler and invoke handler for the incoming message.
388 */
389static void qmi_invoke_handler(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
390 struct qmi_txn *txn, const void *buf, size_t len)
391{
392 const struct qmi_msg_handler *handler;
393 const struct qmi_header *hdr = buf;
394 void *dest;
395 int ret;
396
397 if (!qmi->handlers)
398 return;
399
400 for (handler = qmi->handlers; handler->fn; handler++) {
401 if (handler->type == hdr->type &&
402 handler->msg_id == hdr->msg_id)
403 break;
404 }
405
406 if (!handler->fn)
407 return;
408
409 dest = kzalloc(handler->decoded_size, GFP_KERNEL);
410 if (!dest)
411 return;
412
413 ret = qmi_decode_message(buf, len, handler->ei, dest);
414 if (ret < 0)
415 pr_err("failed to decode incoming message\n");
416 else
417 handler->fn(qmi, sq, txn, dest);
418
419 kfree(dest);
420}
421
422/**
423 * qmi_handle_net_reset() - invoked to handle ENETRESET on a QMI handle
424 * @qmi: the QMI context
425 *
426 * As a result of registering a name service with the QRTR all open sockets are
427 * flagged with ENETRESET and this function will be called. The typical case is
428 * the initial boot, where this signals that the local node id has been
429 * configured and as such any bound sockets needs to be rebound. So close the
430 * socket, inform the client and re-initialize the socket.
431 *
432 * For clients it's generally sufficient to react to the del_server callbacks,
433 * but server code is expected to treat the net_reset callback as a "bye" from
434 * all nodes.
435 *
436 * Finally the QMI handle will send out registration requests for any lookups
437 * and services.
438 */
439static void qmi_handle_net_reset(struct qmi_handle *qmi)
440{
441 struct sockaddr_qrtr sq;
442 struct qmi_service *svc;
443 struct socket *sock;
444
445 sock = qmi_sock_create(qmi, &sq);
446 if (IS_ERR(sock))
447 return;
448
449 mutex_lock(&qmi->sock_lock);
450 sock_release(qmi->sock);
451 qmi->sock = NULL;
452 mutex_unlock(&qmi->sock_lock);
453
454 qmi_recv_del_server(qmi, -1, -1);
455
456 if (qmi->ops.net_reset)
457 qmi->ops.net_reset(qmi);
458
459 mutex_lock(&qmi->sock_lock);
460 qmi->sock = sock;
461 qmi->sq = sq;
462 mutex_unlock(&qmi->sock_lock);
463
464 list_for_each_entry(svc, &qmi->lookups, list_node)
465 qmi_send_new_lookup(qmi, svc);
466
467 list_for_each_entry(svc, &qmi->services, list_node)
468 qmi_send_new_server(qmi, svc);
469}
470
471static void qmi_handle_message(struct qmi_handle *qmi,
472 struct sockaddr_qrtr *sq,
473 const void *buf, size_t len)
474{
475 const struct qmi_header *hdr;
476 struct qmi_txn tmp_txn;
477 struct qmi_txn *txn = NULL;
478 int ret;
479
480 if (len < sizeof(*hdr)) {
481 pr_err("ignoring short QMI packet\n");
482 return;
483 }
484
485 hdr = buf;
486
487 /* If this is a response, find the matching transaction handle */
488 if (hdr->type == QMI_RESPONSE) {
489 mutex_lock(&qmi->txn_lock);
490 txn = idr_find(&qmi->txns, hdr->txn_id);
491
492 /* Ignore unexpected responses */
493 if (!txn) {
494 mutex_unlock(&qmi->txn_lock);
495 return;
496 }
497
498 mutex_lock(&txn->lock);
499 mutex_unlock(&qmi->txn_lock);
500
501 if (txn->dest && txn->ei) {
502 ret = qmi_decode_message(buf, len, txn->ei, txn->dest);
503 if (ret < 0)
504 pr_err("failed to decode incoming message\n");
505
506 txn->result = ret;
507 complete(&txn->completion);
508 } else {
509 qmi_invoke_handler(qmi, sq, txn, buf, len);
510 }
511
512 mutex_unlock(&txn->lock);
513 } else {
514 /* Create a txn based on the txn_id of the incoming message */
515 memset(&tmp_txn, 0, sizeof(tmp_txn));
516 tmp_txn.id = hdr->txn_id;
517
518 qmi_invoke_handler(qmi, sq, &tmp_txn, buf, len);
519 }
520}
521
522static void qmi_data_ready_work(struct work_struct *work)
523{
524 struct qmi_handle *qmi = container_of(work, struct qmi_handle, work);
525 struct qmi_ops *ops = &qmi->ops;
526 struct sockaddr_qrtr sq;
527 struct msghdr msg = { .msg_name = &sq, .msg_namelen = sizeof(sq) };
528 struct kvec iv;
529 ssize_t msglen;
530
531 for (;;) {
532 iv.iov_base = qmi->recv_buf;
533 iv.iov_len = qmi->recv_buf_size;
534
535 mutex_lock(&qmi->sock_lock);
536 if (qmi->sock)
537 msglen = kernel_recvmsg(qmi->sock, &msg, &iv, 1,
538 iv.iov_len, MSG_DONTWAIT);
539 else
540 msglen = -EPIPE;
541 mutex_unlock(&qmi->sock_lock);
542 if (msglen == -EAGAIN)
543 break;
544
545 if (msglen == -ENETRESET) {
546 qmi_handle_net_reset(qmi);
547
548 /* The old qmi->sock is gone, our work is done */
549 break;
550 }
551
552 if (msglen < 0) {
553 pr_err("qmi recvmsg failed: %zd\n", msglen);
554 break;
555 }
556
557 if (sq.sq_node == qmi->sq.sq_node &&
558 sq.sq_port == QRTR_PORT_CTRL) {
559 qmi_recv_ctrl_pkt(qmi, qmi->recv_buf, msglen);
560 } else if (ops->msg_handler) {
561 ops->msg_handler(qmi, &sq, qmi->recv_buf, msglen);
562 } else {
563 qmi_handle_message(qmi, &sq, qmi->recv_buf, msglen);
564 }
565 }
566}
567
568static void qmi_data_ready(struct sock *sk)
569{
570 struct qmi_handle *qmi = sk->sk_user_data;
571
572 /*
573 * This will be NULL if we receive data while being in
574 * qmi_handle_release()
575 */
576 if (!qmi)
577 return;
578
579 queue_work(qmi->wq, &qmi->work);
580}
581
582static struct socket *qmi_sock_create(struct qmi_handle *qmi,
583 struct sockaddr_qrtr *sq)
584{
585 struct socket *sock;
586 int ret;
587
588 ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM,
589 PF_QIPCRTR, &sock);
590 if (ret < 0)
591 return ERR_PTR(ret);
592
593 ret = kernel_getsockname(sock, (struct sockaddr *)sq);
594 if (ret < 0) {
595 sock_release(sock);
596 return ERR_PTR(ret);
597 }
598
599 sock->sk->sk_user_data = qmi;
600 sock->sk->sk_data_ready = qmi_data_ready;
601 sock->sk->sk_error_report = qmi_data_ready;
602
603 return sock;
604}
605
606/**
607 * qmi_handle_init() - initialize a QMI client handle
608 * @qmi: QMI handle to initialize
609 * @recv_buf_size: maximum size of incoming message
610 * @ops: reference to callbacks for QRTR notifications
611 * @handlers: NULL-terminated list of QMI message handlers
612 *
613 * This initializes the QMI client handle to allow sending and receiving QMI
614 * messages. As messages are received the appropriate handler will be invoked.
615 *
616 * Return: 0 on success, negative errno on failure.
617 */
618int qmi_handle_init(struct qmi_handle *qmi, size_t recv_buf_size,
619 const struct qmi_ops *ops,
620 const struct qmi_msg_handler *handlers)
621{
622 int ret;
623
624 mutex_init(&qmi->txn_lock);
625 mutex_init(&qmi->sock_lock);
626
627 idr_init(&qmi->txns);
628
629 INIT_LIST_HEAD(&qmi->lookups);
630 INIT_LIST_HEAD(&qmi->lookup_results);
631 INIT_LIST_HEAD(&qmi->services);
632
633 INIT_WORK(&qmi->work, qmi_data_ready_work);
634
635 qmi->handlers = handlers;
636 if (ops)
637 qmi->ops = *ops;
638
639 /* Make room for the header */
640 recv_buf_size += sizeof(struct qmi_header);
641 /* Must also be sufficient to hold a control packet */
642 if (recv_buf_size < sizeof(struct qrtr_ctrl_pkt))
643 recv_buf_size = sizeof(struct qrtr_ctrl_pkt);
644
645 qmi->recv_buf_size = recv_buf_size;
646 qmi->recv_buf = kzalloc(recv_buf_size, GFP_KERNEL);
647 if (!qmi->recv_buf)
648 return -ENOMEM;
649
650 qmi->wq = alloc_workqueue("qmi_msg_handler", WQ_UNBOUND, 1);
651 if (!qmi->wq) {
652 ret = -ENOMEM;
653 goto err_free_recv_buf;
654 }
655
656 qmi->sock = qmi_sock_create(qmi, &qmi->sq);
657 if (IS_ERR(qmi->sock)) {
658 if (PTR_ERR(qmi->sock) == -EAFNOSUPPORT) {
659 ret = -EPROBE_DEFER;
660 } else {
661 pr_err("failed to create QMI socket\n");
662 ret = PTR_ERR(qmi->sock);
663 }
664 goto err_destroy_wq;
665 }
666
667 return 0;
668
669err_destroy_wq:
670 destroy_workqueue(qmi->wq);
671err_free_recv_buf:
672 kfree(qmi->recv_buf);
673
674 return ret;
675}
676EXPORT_SYMBOL(qmi_handle_init);
677
678/**
679 * qmi_handle_release() - release the QMI client handle
680 * @qmi: QMI client handle
681 *
682 * This closes the underlying socket and stops any handling of QMI messages.
683 */
684void qmi_handle_release(struct qmi_handle *qmi)
685{
686 struct socket *sock = qmi->sock;
687 struct qmi_service *svc, *tmp;
688
689 sock->sk->sk_user_data = NULL;
690 cancel_work_sync(&qmi->work);
691
692 qmi_recv_del_server(qmi, -1, -1);
693
694 mutex_lock(&qmi->sock_lock);
695 sock_release(sock);
696 qmi->sock = NULL;
697 mutex_unlock(&qmi->sock_lock);
698
699 destroy_workqueue(qmi->wq);
700
701 idr_destroy(&qmi->txns);
702
703 kfree(qmi->recv_buf);
704
705 /* Free registered lookup requests */
706 list_for_each_entry_safe(svc, tmp, &qmi->lookups, list_node) {
707 list_del(&svc->list_node);
708 kfree(svc);
709 }
710
711 /* Free registered service information */
712 list_for_each_entry_safe(svc, tmp, &qmi->services, list_node) {
713 list_del(&svc->list_node);
714 kfree(svc);
715 }
716}
717EXPORT_SYMBOL(qmi_handle_release);
718
719/**
720 * qmi_send_message() - send a QMI message
721 * @qmi: QMI client handle
722 * @sq: destination sockaddr
723 * @txn: transaction object to use for the message
724 * @type: type of message to send
725 * @msg_id: message id
726 * @len: max length of the QMI message
727 * @ei: QMI message description
728 * @c_struct: object to be encoded
729 *
730 * This function encodes @c_struct using @ei into a message of type @type,
731 * with @msg_id and @txn into a buffer of maximum size @len, and sends this to
732 * @sq.
733 *
734 * Return: 0 on success, negative errno on failure.
735 */
736static ssize_t qmi_send_message(struct qmi_handle *qmi,
737 struct sockaddr_qrtr *sq, struct qmi_txn *txn,
738 int type, int msg_id, size_t len,
739 const struct qmi_elem_info *ei,
740 const void *c_struct)
741{
742 struct msghdr msghdr = {};
743 struct kvec iv;
744 void *msg;
745 int ret;
746
747 msg = qmi_encode_message(type,
748 msg_id, &len,
749 txn->id, ei,
750 c_struct);
751 if (IS_ERR(msg))
752 return PTR_ERR(msg);
753
754 iv.iov_base = msg;
755 iv.iov_len = len;
756
757 if (sq) {
758 msghdr.msg_name = sq;
759 msghdr.msg_namelen = sizeof(*sq);
760 }
761
762 mutex_lock(&qmi->sock_lock);
763 if (qmi->sock) {
764 ret = kernel_sendmsg(qmi->sock, &msghdr, &iv, 1, len);
765 if (ret < 0)
766 pr_err("failed to send QMI message\n");
767 } else {
768 ret = -EPIPE;
769 }
770 mutex_unlock(&qmi->sock_lock);
771
772 kfree(msg);
773
774 return ret < 0 ? ret : 0;
775}
776
777/**
778 * qmi_send_request() - send a request QMI message
779 * @qmi: QMI client handle
780 * @sq: destination sockaddr
781 * @txn: transaction object to use for the message
782 * @msg_id: message id
783 * @len: max length of the QMI message
784 * @ei: QMI message description
785 * @c_struct: object to be encoded
786 *
787 * Return: 0 on success, negative errno on failure.
788 */
789ssize_t qmi_send_request(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
790 struct qmi_txn *txn, int msg_id, size_t len,
791 const struct qmi_elem_info *ei, const void *c_struct)
792{
793 return qmi_send_message(qmi, sq, txn, QMI_REQUEST, msg_id, len, ei,
794 c_struct);
795}
796EXPORT_SYMBOL(qmi_send_request);
797
798/**
799 * qmi_send_response() - send a response QMI message
800 * @qmi: QMI client handle
801 * @sq: destination sockaddr
802 * @txn: transaction object to use for the message
803 * @msg_id: message id
804 * @len: max length of the QMI message
805 * @ei: QMI message description
806 * @c_struct: object to be encoded
807 *
808 * Return: 0 on success, negative errno on failure.
809 */
810ssize_t qmi_send_response(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
811 struct qmi_txn *txn, int msg_id, size_t len,
812 const struct qmi_elem_info *ei, const void *c_struct)
813{
814 return qmi_send_message(qmi, sq, txn, QMI_RESPONSE, msg_id, len, ei,
815 c_struct);
816}
817EXPORT_SYMBOL(qmi_send_response);
818
819/**
820 * qmi_send_indication() - send an indication QMI message
821 * @qmi: QMI client handle
822 * @sq: destination sockaddr
823 * @msg_id: message id
824 * @len: max length of the QMI message
825 * @ei: QMI message description
826 * @c_struct: object to be encoded
827 *
828 * Return: 0 on success, negative errno on failure.
829 */
830ssize_t qmi_send_indication(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
831 int msg_id, size_t len,
832 const struct qmi_elem_info *ei,
833 const void *c_struct)
834{
835 struct qmi_txn txn;
836 ssize_t rval;
837 int ret;
838
839 ret = qmi_txn_init(qmi, &txn, NULL, NULL);
840 if (ret < 0)
841 return ret;
842
843 rval = qmi_send_message(qmi, sq, &txn, QMI_INDICATION, msg_id, len, ei,
844 c_struct);
845
846 /* We don't care about future messages on this txn */
847 qmi_txn_cancel(&txn);
848
849 return rval;
850}
851EXPORT_SYMBOL(qmi_send_indication);