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3830d077 BA |
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> | |
40e0b090 | 15 | #include <trace/events/sock.h> |
3830d077 BA |
16 | #include <linux/soc/qcom/qmi.h> |
17 | ||
18 | static struct socket *qmi_sock_create(struct qmi_handle *qmi, | |
19 | struct sockaddr_qrtr *sq); | |
20 | ||
21 | /** | |
22 | * qmi_recv_new_server() - handler of NEW_SERVER control message | |
23 | * @qmi: qmi handle | |
24 | * @service: service id of the new server | |
25 | * @instance: instance id of the new server | |
26 | * @node: node of the new server | |
27 | * @port: port of the new server | |
28 | * | |
29 | * Calls the new_server callback to inform the client about a newly registered | |
30 | * server matching the currently registered service lookup. | |
31 | */ | |
32 | static void qmi_recv_new_server(struct qmi_handle *qmi, | |
33 | unsigned int service, unsigned int instance, | |
34 | unsigned int node, unsigned int port) | |
35 | { | |
36 | struct qmi_ops *ops = &qmi->ops; | |
37 | struct qmi_service *svc; | |
38 | int ret; | |
39 | ||
40 | if (!ops->new_server) | |
41 | return; | |
42 | ||
43 | /* Ignore EOF marker */ | |
44 | if (!node && !port) | |
45 | return; | |
46 | ||
47 | svc = kzalloc(sizeof(*svc), GFP_KERNEL); | |
48 | if (!svc) | |
49 | return; | |
50 | ||
51 | svc->service = service; | |
52 | svc->version = instance & 0xff; | |
53 | svc->instance = instance >> 8; | |
54 | svc->node = node; | |
55 | svc->port = port; | |
56 | ||
57 | ret = ops->new_server(qmi, svc); | |
58 | if (ret < 0) | |
59 | kfree(svc); | |
60 | else | |
61 | list_add(&svc->list_node, &qmi->lookup_results); | |
62 | } | |
63 | ||
64 | /** | |
65 | * qmi_recv_del_server() - handler of DEL_SERVER control message | |
66 | * @qmi: qmi handle | |
67 | * @node: node of the dying server, a value of -1 matches all nodes | |
68 | * @port: port of the dying server, a value of -1 matches all ports | |
69 | * | |
70 | * Calls the del_server callback for each previously seen server, allowing the | |
71 | * client to react to the disappearing server. | |
72 | */ | |
73 | static void qmi_recv_del_server(struct qmi_handle *qmi, | |
74 | unsigned int node, unsigned int port) | |
75 | { | |
76 | struct qmi_ops *ops = &qmi->ops; | |
77 | struct qmi_service *svc; | |
78 | struct qmi_service *tmp; | |
79 | ||
80 | list_for_each_entry_safe(svc, tmp, &qmi->lookup_results, list_node) { | |
81 | if (node != -1 && svc->node != node) | |
82 | continue; | |
83 | if (port != -1 && svc->port != port) | |
84 | continue; | |
85 | ||
86 | if (ops->del_server) | |
87 | ops->del_server(qmi, svc); | |
88 | ||
89 | list_del(&svc->list_node); | |
90 | kfree(svc); | |
91 | } | |
92 | } | |
93 | ||
94 | /** | |
95 | * qmi_recv_bye() - handler of BYE control message | |
96 | * @qmi: qmi handle | |
97 | * @node: id of the dying node | |
98 | * | |
99 | * Signals the client that all previously registered services on this node are | |
bd9ccaec | 100 | * now gone and then calls the bye callback to allow the client further |
3830d077 BA |
101 | * cleaning up resources associated with this remote. |
102 | */ | |
103 | static void qmi_recv_bye(struct qmi_handle *qmi, | |
104 | unsigned int node) | |
105 | { | |
106 | struct qmi_ops *ops = &qmi->ops; | |
107 | ||
108 | qmi_recv_del_server(qmi, node, -1); | |
109 | ||
110 | if (ops->bye) | |
111 | ops->bye(qmi, node); | |
112 | } | |
113 | ||
114 | /** | |
115 | * qmi_recv_del_client() - handler of DEL_CLIENT control message | |
116 | * @qmi: qmi handle | |
117 | * @node: node of the dying client | |
118 | * @port: port of the dying client | |
119 | * | |
120 | * Signals the client about a dying client, by calling the del_client callback. | |
121 | */ | |
122 | static void qmi_recv_del_client(struct qmi_handle *qmi, | |
123 | unsigned int node, unsigned int port) | |
124 | { | |
125 | struct qmi_ops *ops = &qmi->ops; | |
126 | ||
127 | if (ops->del_client) | |
128 | ops->del_client(qmi, node, port); | |
129 | } | |
130 | ||
131 | static void qmi_recv_ctrl_pkt(struct qmi_handle *qmi, | |
132 | const void *buf, size_t len) | |
133 | { | |
134 | const struct qrtr_ctrl_pkt *pkt = buf; | |
135 | ||
136 | if (len < sizeof(struct qrtr_ctrl_pkt)) { | |
137 | pr_debug("ignoring short control packet\n"); | |
138 | return; | |
139 | } | |
140 | ||
141 | switch (le32_to_cpu(pkt->cmd)) { | |
142 | case QRTR_TYPE_BYE: | |
143 | qmi_recv_bye(qmi, le32_to_cpu(pkt->client.node)); | |
144 | break; | |
145 | case QRTR_TYPE_NEW_SERVER: | |
146 | qmi_recv_new_server(qmi, | |
147 | le32_to_cpu(pkt->server.service), | |
148 | le32_to_cpu(pkt->server.instance), | |
149 | le32_to_cpu(pkt->server.node), | |
150 | le32_to_cpu(pkt->server.port)); | |
151 | break; | |
152 | case QRTR_TYPE_DEL_SERVER: | |
153 | qmi_recv_del_server(qmi, | |
154 | le32_to_cpu(pkt->server.node), | |
155 | le32_to_cpu(pkt->server.port)); | |
156 | break; | |
157 | case QRTR_TYPE_DEL_CLIENT: | |
158 | qmi_recv_del_client(qmi, | |
159 | le32_to_cpu(pkt->client.node), | |
160 | le32_to_cpu(pkt->client.port)); | |
161 | break; | |
162 | } | |
163 | } | |
164 | ||
165 | static void qmi_send_new_lookup(struct qmi_handle *qmi, struct qmi_service *svc) | |
166 | { | |
167 | struct qrtr_ctrl_pkt pkt; | |
168 | struct sockaddr_qrtr sq; | |
169 | struct msghdr msg = { }; | |
170 | struct kvec iv = { &pkt, sizeof(pkt) }; | |
171 | int ret; | |
172 | ||
173 | memset(&pkt, 0, sizeof(pkt)); | |
174 | pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_LOOKUP); | |
175 | pkt.server.service = cpu_to_le32(svc->service); | |
176 | pkt.server.instance = cpu_to_le32(svc->version | svc->instance << 8); | |
177 | ||
178 | sq.sq_family = qmi->sq.sq_family; | |
179 | sq.sq_node = qmi->sq.sq_node; | |
180 | sq.sq_port = QRTR_PORT_CTRL; | |
181 | ||
182 | msg.msg_name = &sq; | |
183 | msg.msg_namelen = sizeof(sq); | |
184 | ||
185 | mutex_lock(&qmi->sock_lock); | |
186 | if (qmi->sock) { | |
187 | ret = kernel_sendmsg(qmi->sock, &msg, &iv, 1, sizeof(pkt)); | |
188 | if (ret < 0) | |
189 | pr_err("failed to send lookup registration: %d\n", ret); | |
190 | } | |
191 | mutex_unlock(&qmi->sock_lock); | |
192 | } | |
193 | ||
194 | /** | |
195 | * qmi_add_lookup() - register a new lookup with the name service | |
196 | * @qmi: qmi handle | |
197 | * @service: service id of the request | |
198 | * @instance: instance id of the request | |
199 | * @version: version number of the request | |
200 | * | |
201 | * Registering a lookup query with the name server will cause the name server | |
202 | * to send NEW_SERVER and DEL_SERVER control messages to this socket as | |
203 | * matching services are registered. | |
204 | * | |
205 | * Return: 0 on success, negative errno on failure. | |
206 | */ | |
207 | int qmi_add_lookup(struct qmi_handle *qmi, unsigned int service, | |
208 | unsigned int version, unsigned int instance) | |
209 | { | |
210 | struct qmi_service *svc; | |
211 | ||
212 | svc = kzalloc(sizeof(*svc), GFP_KERNEL); | |
213 | if (!svc) | |
214 | return -ENOMEM; | |
215 | ||
216 | svc->service = service; | |
217 | svc->version = version; | |
218 | svc->instance = instance; | |
219 | ||
220 | list_add(&svc->list_node, &qmi->lookups); | |
221 | ||
222 | qmi_send_new_lookup(qmi, svc); | |
223 | ||
224 | return 0; | |
225 | } | |
226 | EXPORT_SYMBOL(qmi_add_lookup); | |
227 | ||
228 | static void qmi_send_new_server(struct qmi_handle *qmi, struct qmi_service *svc) | |
229 | { | |
230 | struct qrtr_ctrl_pkt pkt; | |
231 | struct sockaddr_qrtr sq; | |
232 | struct msghdr msg = { }; | |
233 | struct kvec iv = { &pkt, sizeof(pkt) }; | |
234 | int ret; | |
235 | ||
236 | memset(&pkt, 0, sizeof(pkt)); | |
237 | pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_SERVER); | |
238 | pkt.server.service = cpu_to_le32(svc->service); | |
239 | pkt.server.instance = cpu_to_le32(svc->version | svc->instance << 8); | |
240 | pkt.server.node = cpu_to_le32(qmi->sq.sq_node); | |
241 | pkt.server.port = cpu_to_le32(qmi->sq.sq_port); | |
242 | ||
243 | sq.sq_family = qmi->sq.sq_family; | |
244 | sq.sq_node = qmi->sq.sq_node; | |
245 | sq.sq_port = QRTR_PORT_CTRL; | |
246 | ||
247 | msg.msg_name = &sq; | |
248 | msg.msg_namelen = sizeof(sq); | |
249 | ||
250 | mutex_lock(&qmi->sock_lock); | |
251 | if (qmi->sock) { | |
252 | ret = kernel_sendmsg(qmi->sock, &msg, &iv, 1, sizeof(pkt)); | |
253 | if (ret < 0) | |
254 | pr_err("send service registration failed: %d\n", ret); | |
255 | } | |
256 | mutex_unlock(&qmi->sock_lock); | |
257 | } | |
258 | ||
259 | /** | |
260 | * qmi_add_server() - register a service with the name service | |
261 | * @qmi: qmi handle | |
262 | * @service: type of the service | |
263 | * @instance: instance of the service | |
264 | * @version: version of the service | |
265 | * | |
266 | * Register a new service with the name service. This allows clients to find | |
267 | * and start sending messages to the client associated with @qmi. | |
268 | * | |
269 | * Return: 0 on success, negative errno on failure. | |
270 | */ | |
271 | int qmi_add_server(struct qmi_handle *qmi, unsigned int service, | |
272 | unsigned int version, unsigned int instance) | |
273 | { | |
274 | struct qmi_service *svc; | |
275 | ||
276 | svc = kzalloc(sizeof(*svc), GFP_KERNEL); | |
277 | if (!svc) | |
278 | return -ENOMEM; | |
279 | ||
280 | svc->service = service; | |
281 | svc->version = version; | |
282 | svc->instance = instance; | |
283 | ||
284 | list_add(&svc->list_node, &qmi->services); | |
285 | ||
286 | qmi_send_new_server(qmi, svc); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | EXPORT_SYMBOL(qmi_add_server); | |
291 | ||
292 | /** | |
293 | * qmi_txn_init() - allocate transaction id within the given QMI handle | |
294 | * @qmi: QMI handle | |
295 | * @txn: transaction context | |
296 | * @ei: description of how to decode a matching response (optional) | |
297 | * @c_struct: pointer to the object to decode the response into (optional) | |
298 | * | |
299 | * This allocates a transaction id within the QMI handle. If @ei and @c_struct | |
300 | * are specified any responses to this transaction will be decoded as described | |
301 | * by @ei into @c_struct. | |
302 | * | |
303 | * A client calling qmi_txn_init() must call either qmi_txn_wait() or | |
304 | * qmi_txn_cancel() to free up the allocated resources. | |
305 | * | |
306 | * Return: Transaction id on success, negative errno on failure. | |
307 | */ | |
308 | int qmi_txn_init(struct qmi_handle *qmi, struct qmi_txn *txn, | |
ff6d3658 | 309 | const struct qmi_elem_info *ei, void *c_struct) |
3830d077 BA |
310 | { |
311 | int ret; | |
312 | ||
313 | memset(txn, 0, sizeof(*txn)); | |
314 | ||
315 | mutex_init(&txn->lock); | |
316 | init_completion(&txn->completion); | |
317 | txn->qmi = qmi; | |
318 | txn->ei = ei; | |
319 | txn->dest = c_struct; | |
320 | ||
321 | mutex_lock(&qmi->txn_lock); | |
c4fe17e0 | 322 | ret = idr_alloc_cyclic(&qmi->txns, txn, 0, U16_MAX, GFP_KERNEL); |
3830d077 BA |
323 | if (ret < 0) |
324 | pr_err("failed to allocate transaction id\n"); | |
325 | ||
326 | txn->id = ret; | |
327 | mutex_unlock(&qmi->txn_lock); | |
328 | ||
329 | return ret; | |
330 | } | |
331 | EXPORT_SYMBOL(qmi_txn_init); | |
332 | ||
333 | /** | |
334 | * qmi_txn_wait() - wait for a response on a transaction | |
335 | * @txn: transaction handle | |
336 | * @timeout: timeout, in jiffies | |
337 | * | |
338 | * If the transaction is decoded by the means of @ei and @c_struct the return | |
339 | * value will be the returned value of qmi_decode_message(), otherwise it's up | |
340 | * to the specified message handler to fill out the result. | |
341 | * | |
342 | * Return: the transaction response on success, negative errno on failure. | |
343 | */ | |
344 | int qmi_txn_wait(struct qmi_txn *txn, unsigned long timeout) | |
345 | { | |
346 | struct qmi_handle *qmi = txn->qmi; | |
347 | int ret; | |
348 | ||
9324df58 | 349 | ret = wait_for_completion_timeout(&txn->completion, timeout); |
3830d077 BA |
350 | |
351 | mutex_lock(&qmi->txn_lock); | |
352 | mutex_lock(&txn->lock); | |
353 | idr_remove(&qmi->txns, txn->id); | |
354 | mutex_unlock(&txn->lock); | |
355 | mutex_unlock(&qmi->txn_lock); | |
356 | ||
9324df58 | 357 | if (ret == 0) |
3830d077 BA |
358 | return -ETIMEDOUT; |
359 | else | |
360 | return txn->result; | |
361 | } | |
362 | EXPORT_SYMBOL(qmi_txn_wait); | |
363 | ||
364 | /** | |
365 | * qmi_txn_cancel() - cancel an ongoing transaction | |
366 | * @txn: transaction id | |
367 | */ | |
368 | void qmi_txn_cancel(struct qmi_txn *txn) | |
369 | { | |
370 | struct qmi_handle *qmi = txn->qmi; | |
371 | ||
372 | mutex_lock(&qmi->txn_lock); | |
373 | mutex_lock(&txn->lock); | |
374 | idr_remove(&qmi->txns, txn->id); | |
375 | mutex_unlock(&txn->lock); | |
376 | mutex_unlock(&qmi->txn_lock); | |
377 | } | |
378 | EXPORT_SYMBOL(qmi_txn_cancel); | |
379 | ||
380 | /** | |
381 | * qmi_invoke_handler() - find and invoke a handler for a message | |
382 | * @qmi: qmi handle | |
383 | * @sq: sockaddr of the sender | |
384 | * @txn: transaction object for the message | |
385 | * @buf: buffer containing the message | |
386 | * @len: length of @buf | |
387 | * | |
388 | * Find handler and invoke handler for the incoming message. | |
389 | */ | |
390 | static void qmi_invoke_handler(struct qmi_handle *qmi, struct sockaddr_qrtr *sq, | |
391 | struct qmi_txn *txn, const void *buf, size_t len) | |
392 | { | |
393 | const struct qmi_msg_handler *handler; | |
394 | const struct qmi_header *hdr = buf; | |
395 | void *dest; | |
396 | int ret; | |
397 | ||
398 | if (!qmi->handlers) | |
399 | return; | |
400 | ||
401 | for (handler = qmi->handlers; handler->fn; handler++) { | |
402 | if (handler->type == hdr->type && | |
403 | handler->msg_id == hdr->msg_id) | |
404 | break; | |
405 | } | |
406 | ||
407 | if (!handler->fn) | |
408 | return; | |
409 | ||
410 | dest = kzalloc(handler->decoded_size, GFP_KERNEL); | |
411 | if (!dest) | |
412 | return; | |
413 | ||
414 | ret = qmi_decode_message(buf, len, handler->ei, dest); | |
415 | if (ret < 0) | |
416 | pr_err("failed to decode incoming message\n"); | |
417 | else | |
418 | handler->fn(qmi, sq, txn, dest); | |
419 | ||
420 | kfree(dest); | |
421 | } | |
422 | ||
423 | /** | |
424 | * qmi_handle_net_reset() - invoked to handle ENETRESET on a QMI handle | |
425 | * @qmi: the QMI context | |
426 | * | |
427 | * As a result of registering a name service with the QRTR all open sockets are | |
428 | * flagged with ENETRESET and this function will be called. The typical case is | |
429 | * the initial boot, where this signals that the local node id has been | |
430 | * configured and as such any bound sockets needs to be rebound. So close the | |
431 | * socket, inform the client and re-initialize the socket. | |
432 | * | |
433 | * For clients it's generally sufficient to react to the del_server callbacks, | |
434 | * but server code is expected to treat the net_reset callback as a "bye" from | |
435 | * all nodes. | |
436 | * | |
437 | * Finally the QMI handle will send out registration requests for any lookups | |
438 | * and services. | |
439 | */ | |
440 | static void qmi_handle_net_reset(struct qmi_handle *qmi) | |
441 | { | |
442 | struct sockaddr_qrtr sq; | |
443 | struct qmi_service *svc; | |
444 | struct socket *sock; | |
445 | ||
446 | sock = qmi_sock_create(qmi, &sq); | |
447 | if (IS_ERR(sock)) | |
448 | return; | |
449 | ||
450 | mutex_lock(&qmi->sock_lock); | |
451 | sock_release(qmi->sock); | |
452 | qmi->sock = NULL; | |
453 | mutex_unlock(&qmi->sock_lock); | |
454 | ||
455 | qmi_recv_del_server(qmi, -1, -1); | |
456 | ||
457 | if (qmi->ops.net_reset) | |
458 | qmi->ops.net_reset(qmi); | |
459 | ||
460 | mutex_lock(&qmi->sock_lock); | |
461 | qmi->sock = sock; | |
462 | qmi->sq = sq; | |
463 | mutex_unlock(&qmi->sock_lock); | |
464 | ||
465 | list_for_each_entry(svc, &qmi->lookups, list_node) | |
466 | qmi_send_new_lookup(qmi, svc); | |
467 | ||
468 | list_for_each_entry(svc, &qmi->services, list_node) | |
469 | qmi_send_new_server(qmi, svc); | |
470 | } | |
471 | ||
472 | static void qmi_handle_message(struct qmi_handle *qmi, | |
473 | struct sockaddr_qrtr *sq, | |
474 | const void *buf, size_t len) | |
475 | { | |
476 | const struct qmi_header *hdr; | |
477 | struct qmi_txn tmp_txn; | |
478 | struct qmi_txn *txn = NULL; | |
479 | int ret; | |
480 | ||
481 | if (len < sizeof(*hdr)) { | |
482 | pr_err("ignoring short QMI packet\n"); | |
483 | return; | |
484 | } | |
485 | ||
486 | hdr = buf; | |
487 | ||
488 | /* If this is a response, find the matching transaction handle */ | |
489 | if (hdr->type == QMI_RESPONSE) { | |
490 | mutex_lock(&qmi->txn_lock); | |
491 | txn = idr_find(&qmi->txns, hdr->txn_id); | |
492 | ||
493 | /* Ignore unexpected responses */ | |
494 | if (!txn) { | |
495 | mutex_unlock(&qmi->txn_lock); | |
496 | return; | |
497 | } | |
498 | ||
499 | mutex_lock(&txn->lock); | |
500 | mutex_unlock(&qmi->txn_lock); | |
501 | ||
502 | if (txn->dest && txn->ei) { | |
503 | ret = qmi_decode_message(buf, len, txn->ei, txn->dest); | |
504 | if (ret < 0) | |
505 | pr_err("failed to decode incoming message\n"); | |
506 | ||
507 | txn->result = ret; | |
508 | complete(&txn->completion); | |
509 | } else { | |
510 | qmi_invoke_handler(qmi, sq, txn, buf, len); | |
511 | } | |
512 | ||
513 | mutex_unlock(&txn->lock); | |
514 | } else { | |
515 | /* Create a txn based on the txn_id of the incoming message */ | |
516 | memset(&tmp_txn, 0, sizeof(tmp_txn)); | |
517 | tmp_txn.id = hdr->txn_id; | |
518 | ||
519 | qmi_invoke_handler(qmi, sq, &tmp_txn, buf, len); | |
520 | } | |
521 | } | |
522 | ||
523 | static void qmi_data_ready_work(struct work_struct *work) | |
524 | { | |
525 | struct qmi_handle *qmi = container_of(work, struct qmi_handle, work); | |
526 | struct qmi_ops *ops = &qmi->ops; | |
527 | struct sockaddr_qrtr sq; | |
528 | struct msghdr msg = { .msg_name = &sq, .msg_namelen = sizeof(sq) }; | |
529 | struct kvec iv; | |
530 | ssize_t msglen; | |
531 | ||
532 | for (;;) { | |
533 | iv.iov_base = qmi->recv_buf; | |
534 | iv.iov_len = qmi->recv_buf_size; | |
535 | ||
536 | mutex_lock(&qmi->sock_lock); | |
537 | if (qmi->sock) | |
538 | msglen = kernel_recvmsg(qmi->sock, &msg, &iv, 1, | |
539 | iv.iov_len, MSG_DONTWAIT); | |
540 | else | |
541 | msglen = -EPIPE; | |
542 | mutex_unlock(&qmi->sock_lock); | |
543 | if (msglen == -EAGAIN) | |
544 | break; | |
545 | ||
546 | if (msglen == -ENETRESET) { | |
547 | qmi_handle_net_reset(qmi); | |
548 | ||
549 | /* The old qmi->sock is gone, our work is done */ | |
550 | break; | |
551 | } | |
552 | ||
553 | if (msglen < 0) { | |
554 | pr_err("qmi recvmsg failed: %zd\n", msglen); | |
555 | break; | |
556 | } | |
557 | ||
558 | if (sq.sq_node == qmi->sq.sq_node && | |
559 | sq.sq_port == QRTR_PORT_CTRL) { | |
560 | qmi_recv_ctrl_pkt(qmi, qmi->recv_buf, msglen); | |
561 | } else if (ops->msg_handler) { | |
562 | ops->msg_handler(qmi, &sq, qmi->recv_buf, msglen); | |
563 | } else { | |
564 | qmi_handle_message(qmi, &sq, qmi->recv_buf, msglen); | |
565 | } | |
566 | } | |
567 | } | |
568 | ||
569 | static void qmi_data_ready(struct sock *sk) | |
570 | { | |
571 | struct qmi_handle *qmi = sk->sk_user_data; | |
572 | ||
40e0b090 PY |
573 | trace_sk_data_ready(sk); |
574 | ||
3830d077 BA |
575 | /* |
576 | * This will be NULL if we receive data while being in | |
577 | * qmi_handle_release() | |
578 | */ | |
579 | if (!qmi) | |
580 | return; | |
581 | ||
582 | queue_work(qmi->wq, &qmi->work); | |
583 | } | |
584 | ||
585 | static struct socket *qmi_sock_create(struct qmi_handle *qmi, | |
586 | struct sockaddr_qrtr *sq) | |
587 | { | |
588 | struct socket *sock; | |
3830d077 BA |
589 | int ret; |
590 | ||
591 | ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM, | |
592 | PF_QIPCRTR, &sock); | |
593 | if (ret < 0) | |
594 | return ERR_PTR(ret); | |
595 | ||
9b2c45d4 | 596 | ret = kernel_getsockname(sock, (struct sockaddr *)sq); |
3830d077 BA |
597 | if (ret < 0) { |
598 | sock_release(sock); | |
599 | return ERR_PTR(ret); | |
600 | } | |
601 | ||
602 | sock->sk->sk_user_data = qmi; | |
603 | sock->sk->sk_data_ready = qmi_data_ready; | |
604 | sock->sk->sk_error_report = qmi_data_ready; | |
605 | ||
606 | return sock; | |
607 | } | |
608 | ||
609 | /** | |
610 | * qmi_handle_init() - initialize a QMI client handle | |
611 | * @qmi: QMI handle to initialize | |
612 | * @recv_buf_size: maximum size of incoming message | |
613 | * @ops: reference to callbacks for QRTR notifications | |
614 | * @handlers: NULL-terminated list of QMI message handlers | |
615 | * | |
616 | * This initializes the QMI client handle to allow sending and receiving QMI | |
617 | * messages. As messages are received the appropriate handler will be invoked. | |
618 | * | |
619 | * Return: 0 on success, negative errno on failure. | |
620 | */ | |
621 | int qmi_handle_init(struct qmi_handle *qmi, size_t recv_buf_size, | |
622 | const struct qmi_ops *ops, | |
623 | const struct qmi_msg_handler *handlers) | |
624 | { | |
625 | int ret; | |
626 | ||
627 | mutex_init(&qmi->txn_lock); | |
628 | mutex_init(&qmi->sock_lock); | |
629 | ||
630 | idr_init(&qmi->txns); | |
631 | ||
632 | INIT_LIST_HEAD(&qmi->lookups); | |
633 | INIT_LIST_HEAD(&qmi->lookup_results); | |
634 | INIT_LIST_HEAD(&qmi->services); | |
635 | ||
636 | INIT_WORK(&qmi->work, qmi_data_ready_work); | |
637 | ||
638 | qmi->handlers = handlers; | |
639 | if (ops) | |
640 | qmi->ops = *ops; | |
641 | ||
7df5ff25 AE |
642 | /* Make room for the header */ |
643 | recv_buf_size += sizeof(struct qmi_header); | |
644 | /* Must also be sufficient to hold a control packet */ | |
3830d077 BA |
645 | if (recv_buf_size < sizeof(struct qrtr_ctrl_pkt)) |
646 | recv_buf_size = sizeof(struct qrtr_ctrl_pkt); | |
3830d077 BA |
647 | |
648 | qmi->recv_buf_size = recv_buf_size; | |
649 | qmi->recv_buf = kzalloc(recv_buf_size, GFP_KERNEL); | |
650 | if (!qmi->recv_buf) | |
651 | return -ENOMEM; | |
652 | ||
653 | qmi->wq = alloc_workqueue("qmi_msg_handler", WQ_UNBOUND, 1); | |
654 | if (!qmi->wq) { | |
655 | ret = -ENOMEM; | |
656 | goto err_free_recv_buf; | |
657 | } | |
658 | ||
659 | qmi->sock = qmi_sock_create(qmi, &qmi->sq); | |
660 | if (IS_ERR(qmi->sock)) { | |
52af26e3 JH |
661 | if (PTR_ERR(qmi->sock) == -EAFNOSUPPORT) { |
662 | ret = -EPROBE_DEFER; | |
663 | } else { | |
664 | pr_err("failed to create QMI socket\n"); | |
665 | ret = PTR_ERR(qmi->sock); | |
666 | } | |
3830d077 BA |
667 | goto err_destroy_wq; |
668 | } | |
669 | ||
670 | return 0; | |
671 | ||
672 | err_destroy_wq: | |
673 | destroy_workqueue(qmi->wq); | |
674 | err_free_recv_buf: | |
675 | kfree(qmi->recv_buf); | |
676 | ||
677 | return ret; | |
678 | } | |
679 | EXPORT_SYMBOL(qmi_handle_init); | |
680 | ||
681 | /** | |
682 | * qmi_handle_release() - release the QMI client handle | |
683 | * @qmi: QMI client handle | |
684 | * | |
685 | * This closes the underlying socket and stops any handling of QMI messages. | |
686 | */ | |
687 | void qmi_handle_release(struct qmi_handle *qmi) | |
688 | { | |
689 | struct socket *sock = qmi->sock; | |
690 | struct qmi_service *svc, *tmp; | |
691 | ||
692 | sock->sk->sk_user_data = NULL; | |
693 | cancel_work_sync(&qmi->work); | |
694 | ||
695 | qmi_recv_del_server(qmi, -1, -1); | |
696 | ||
697 | mutex_lock(&qmi->sock_lock); | |
698 | sock_release(sock); | |
699 | qmi->sock = NULL; | |
700 | mutex_unlock(&qmi->sock_lock); | |
701 | ||
702 | destroy_workqueue(qmi->wq); | |
703 | ||
704 | idr_destroy(&qmi->txns); | |
705 | ||
706 | kfree(qmi->recv_buf); | |
707 | ||
708 | /* Free registered lookup requests */ | |
709 | list_for_each_entry_safe(svc, tmp, &qmi->lookups, list_node) { | |
710 | list_del(&svc->list_node); | |
711 | kfree(svc); | |
712 | } | |
713 | ||
714 | /* Free registered service information */ | |
715 | list_for_each_entry_safe(svc, tmp, &qmi->services, list_node) { | |
716 | list_del(&svc->list_node); | |
717 | kfree(svc); | |
718 | } | |
719 | } | |
720 | EXPORT_SYMBOL(qmi_handle_release); | |
721 | ||
722 | /** | |
723 | * qmi_send_message() - send a QMI message | |
724 | * @qmi: QMI client handle | |
725 | * @sq: destination sockaddr | |
726 | * @txn: transaction object to use for the message | |
727 | * @type: type of message to send | |
728 | * @msg_id: message id | |
729 | * @len: max length of the QMI message | |
730 | * @ei: QMI message description | |
731 | * @c_struct: object to be encoded | |
732 | * | |
733 | * This function encodes @c_struct using @ei into a message of type @type, | |
734 | * with @msg_id and @txn into a buffer of maximum size @len, and sends this to | |
735 | * @sq. | |
736 | * | |
737 | * Return: 0 on success, negative errno on failure. | |
738 | */ | |
739 | static ssize_t qmi_send_message(struct qmi_handle *qmi, | |
740 | struct sockaddr_qrtr *sq, struct qmi_txn *txn, | |
741 | int type, int msg_id, size_t len, | |
ff6d3658 JJ |
742 | const struct qmi_elem_info *ei, |
743 | const void *c_struct) | |
3830d077 BA |
744 | { |
745 | struct msghdr msghdr = {}; | |
746 | struct kvec iv; | |
747 | void *msg; | |
748 | int ret; | |
749 | ||
750 | msg = qmi_encode_message(type, | |
751 | msg_id, &len, | |
752 | txn->id, ei, | |
753 | c_struct); | |
754 | if (IS_ERR(msg)) | |
755 | return PTR_ERR(msg); | |
756 | ||
757 | iv.iov_base = msg; | |
758 | iv.iov_len = len; | |
759 | ||
760 | if (sq) { | |
761 | msghdr.msg_name = sq; | |
762 | msghdr.msg_namelen = sizeof(*sq); | |
763 | } | |
764 | ||
765 | mutex_lock(&qmi->sock_lock); | |
766 | if (qmi->sock) { | |
767 | ret = kernel_sendmsg(qmi->sock, &msghdr, &iv, 1, len); | |
768 | if (ret < 0) | |
769 | pr_err("failed to send QMI message\n"); | |
770 | } else { | |
771 | ret = -EPIPE; | |
772 | } | |
773 | mutex_unlock(&qmi->sock_lock); | |
774 | ||
775 | kfree(msg); | |
776 | ||
777 | return ret < 0 ? ret : 0; | |
778 | } | |
779 | ||
780 | /** | |
781 | * qmi_send_request() - send a request QMI message | |
782 | * @qmi: QMI client handle | |
783 | * @sq: destination sockaddr | |
784 | * @txn: transaction object to use for the message | |
785 | * @msg_id: message id | |
786 | * @len: max length of the QMI message | |
787 | * @ei: QMI message description | |
788 | * @c_struct: object to be encoded | |
789 | * | |
790 | * Return: 0 on success, negative errno on failure. | |
791 | */ | |
792 | ssize_t qmi_send_request(struct qmi_handle *qmi, struct sockaddr_qrtr *sq, | |
793 | struct qmi_txn *txn, int msg_id, size_t len, | |
ff6d3658 | 794 | const struct qmi_elem_info *ei, const void *c_struct) |
3830d077 BA |
795 | { |
796 | return qmi_send_message(qmi, sq, txn, QMI_REQUEST, msg_id, len, ei, | |
797 | c_struct); | |
798 | } | |
799 | EXPORT_SYMBOL(qmi_send_request); | |
800 | ||
801 | /** | |
802 | * qmi_send_response() - send a response QMI message | |
803 | * @qmi: QMI client handle | |
804 | * @sq: destination sockaddr | |
805 | * @txn: transaction object to use for the message | |
806 | * @msg_id: message id | |
807 | * @len: max length of the QMI message | |
808 | * @ei: QMI message description | |
809 | * @c_struct: object to be encoded | |
810 | * | |
811 | * Return: 0 on success, negative errno on failure. | |
812 | */ | |
813 | ssize_t qmi_send_response(struct qmi_handle *qmi, struct sockaddr_qrtr *sq, | |
814 | struct qmi_txn *txn, int msg_id, size_t len, | |
ff6d3658 | 815 | const struct qmi_elem_info *ei, const void *c_struct) |
3830d077 BA |
816 | { |
817 | return qmi_send_message(qmi, sq, txn, QMI_RESPONSE, msg_id, len, ei, | |
818 | c_struct); | |
819 | } | |
820 | EXPORT_SYMBOL(qmi_send_response); | |
821 | ||
822 | /** | |
823 | * qmi_send_indication() - send an indication QMI message | |
824 | * @qmi: QMI client handle | |
825 | * @sq: destination sockaddr | |
826 | * @msg_id: message id | |
827 | * @len: max length of the QMI message | |
828 | * @ei: QMI message description | |
829 | * @c_struct: object to be encoded | |
830 | * | |
831 | * Return: 0 on success, negative errno on failure. | |
832 | */ | |
833 | ssize_t qmi_send_indication(struct qmi_handle *qmi, struct sockaddr_qrtr *sq, | |
ff6d3658 JJ |
834 | int msg_id, size_t len, |
835 | const struct qmi_elem_info *ei, | |
3830d077 BA |
836 | const void *c_struct) |
837 | { | |
838 | struct qmi_txn txn; | |
839 | ssize_t rval; | |
840 | int ret; | |
841 | ||
842 | ret = qmi_txn_init(qmi, &txn, NULL, NULL); | |
843 | if (ret < 0) | |
844 | return ret; | |
845 | ||
846 | rval = qmi_send_message(qmi, sq, &txn, QMI_INDICATION, msg_id, len, ei, | |
847 | c_struct); | |
848 | ||
849 | /* We don't care about future messages on this txn */ | |
850 | qmi_txn_cancel(&txn); | |
851 | ||
852 | return rval; | |
853 | } | |
854 | EXPORT_SYMBOL(qmi_send_indication); |