1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2018 Samsung Electronics Co., Ltd.
4 */
5
6 #include <linux/jhash.h>
7 #include <linux/slab.h>
8 #include <linux/rwsem.h>
9 #include <linux/mutex.h>
10 #include <linux/wait.h>
11 #include <linux/hashtable.h>
12 #include <net/net_namespace.h>
13 #include <net/genetlink.h>
14 #include <linux/socket.h>
15 #include <linux/workqueue.h>
16
17 #include "vfs_cache.h"
18 #include "transport_ipc.h"
19 #include "server.h"
20 #include "smb_common.h"
21
22 #include "mgmt/user_config.h"
23 #include "mgmt/share_config.h"
24 #include "mgmt/user_session.h"
25 #include "mgmt/tree_connect.h"
26 #include "mgmt/ksmbd_ida.h"
27 #include "connection.h"
28 #include "transport_tcp.h"
29 #include "transport_rdma.h"
30
31 #define IPC_WAIT_TIMEOUT (2 * HZ)
32
33 #define IPC_MSG_HASH_BITS 3
34 static DEFINE_HASHTABLE(ipc_msg_table, IPC_MSG_HASH_BITS);
35 static DECLARE_RWSEM(ipc_msg_table_lock);
36 static DEFINE_MUTEX(startup_lock);
37
38 static DEFINE_IDA(ipc_ida);
39
40 static unsigned int ksmbd_tools_pid;
41
42 static bool ksmbd_ipc_validate_version(struct genl_info *m)
43 {
44 if (m->genlhdr->version != KSMBD_GENL_VERSION) {
45 pr_err("%s. ksmbd: %d, kernel module: %d. %s.\n",
46 "Daemon and kernel module version mismatch",
47 m->genlhdr->version,
48 KSMBD_GENL_VERSION,
49 "User-space ksmbd should terminate");
50 return false;
51 }
52 return true;
53 }
54
55 struct ksmbd_ipc_msg {
56 unsigned int type;
57 unsigned int sz;
58 unsigned char payload[];
59 };
60
61 struct ipc_msg_table_entry {
62 unsigned int handle;
63 unsigned int type;
64 wait_queue_head_t wait;
65 struct hlist_node ipc_table_hlist;
66
67 void *response;
68 unsigned int msg_sz;
69 };
70
71 static struct delayed_work ipc_timer_work;
72
73 static int handle_startup_event(struct sk_buff *skb, struct genl_info *info);
74 static int handle_unsupported_event(struct sk_buff *skb, struct genl_info *info);
75 static int handle_generic_event(struct sk_buff *skb, struct genl_info *info);
76 static int ksmbd_ipc_heartbeat_request(void);
77
78 static const struct nla_policy ksmbd_nl_policy[KSMBD_EVENT_MAX + 1] = {
79 [KSMBD_EVENT_UNSPEC] = {
80 .len = 0,
81 },
82 [KSMBD_EVENT_HEARTBEAT_REQUEST] = {
83 .len = sizeof(struct ksmbd_heartbeat),
84 },
85 [KSMBD_EVENT_STARTING_UP] = {
86 .len = sizeof(struct ksmbd_startup_request),
87 },
88 [KSMBD_EVENT_SHUTTING_DOWN] = {
89 .len = sizeof(struct ksmbd_shutdown_request),
90 },
91 [KSMBD_EVENT_LOGIN_REQUEST] = {
92 .len = sizeof(struct ksmbd_login_request),
93 },
94 [KSMBD_EVENT_LOGIN_RESPONSE] = {
95 .len = sizeof(struct ksmbd_login_response),
96 },
97 [KSMBD_EVENT_SHARE_CONFIG_REQUEST] = {
98 .len = sizeof(struct ksmbd_share_config_request),
99 },
100 [KSMBD_EVENT_SHARE_CONFIG_RESPONSE] = {
101 .len = sizeof(struct ksmbd_share_config_response),
102 },
103 [KSMBD_EVENT_TREE_CONNECT_REQUEST] = {
104 .len = sizeof(struct ksmbd_tree_connect_request),
105 },
106 [KSMBD_EVENT_TREE_CONNECT_RESPONSE] = {
107 .len = sizeof(struct ksmbd_tree_connect_response),
108 },
109 [KSMBD_EVENT_TREE_DISCONNECT_REQUEST] = {
110 .len = sizeof(struct ksmbd_tree_disconnect_request),
111 },
112 [KSMBD_EVENT_LOGOUT_REQUEST] = {
113 .len = sizeof(struct ksmbd_logout_request),
114 },
115 [KSMBD_EVENT_RPC_REQUEST] = {
116 },
117 [KSMBD_EVENT_RPC_RESPONSE] = {
118 },
119 [KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST] = {
120 },
121 [KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE] = {
122 },
123 };
124
125 static struct genl_ops ksmbd_genl_ops[] = {
126 {
127 .cmd = KSMBD_EVENT_UNSPEC,
128 .doit = handle_unsupported_event,
129 },
130 {
131 .cmd = KSMBD_EVENT_HEARTBEAT_REQUEST,
132 .doit = handle_unsupported_event,
133 },
134 {
135 .cmd = KSMBD_EVENT_STARTING_UP,
136 .doit = handle_startup_event,
137 },
138 {
139 .cmd = KSMBD_EVENT_SHUTTING_DOWN,
140 .doit = handle_unsupported_event,
141 },
142 {
143 .cmd = KSMBD_EVENT_LOGIN_REQUEST,
144 .doit = handle_unsupported_event,
145 },
146 {
147 .cmd = KSMBD_EVENT_LOGIN_RESPONSE,
148 .doit = handle_generic_event,
149 },
150 {
151 .cmd = KSMBD_EVENT_SHARE_CONFIG_REQUEST,
152 .doit = handle_unsupported_event,
153 },
154 {
155 .cmd = KSMBD_EVENT_SHARE_CONFIG_RESPONSE,
156 .doit = handle_generic_event,
157 },
158 {
159 .cmd = KSMBD_EVENT_TREE_CONNECT_REQUEST,
160 .doit = handle_unsupported_event,
161 },
162 {
163 .cmd = KSMBD_EVENT_TREE_CONNECT_RESPONSE,
164 .doit = handle_generic_event,
165 },
166 {
167 .cmd = KSMBD_EVENT_TREE_DISCONNECT_REQUEST,
168 .doit = handle_unsupported_event,
169 },
170 {
171 .cmd = KSMBD_EVENT_LOGOUT_REQUEST,
172 .doit = handle_unsupported_event,
173 },
174 {
175 .cmd = KSMBD_EVENT_RPC_REQUEST,
176 .doit = handle_unsupported_event,
177 },
178 {
179 .cmd = KSMBD_EVENT_RPC_RESPONSE,
180 .doit = handle_generic_event,
181 },
182 {
183 .cmd = KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST,
184 .doit = handle_unsupported_event,
185 },
186 {
187 .cmd = KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE,
188 .doit = handle_generic_event,
189 },
190 };
191
192 static struct genl_family ksmbd_genl_family = {
193 .name = KSMBD_GENL_NAME,
194 .version = KSMBD_GENL_VERSION,
195 .hdrsize = 0,
196 .maxattr = KSMBD_EVENT_MAX,
197 .netnsok = true,
198 .module = THIS_MODULE,
199 .ops = ksmbd_genl_ops,
200 .n_ops = ARRAY_SIZE(ksmbd_genl_ops),
201 .resv_start_op = KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE + 1,
202 };
203
204 static void ksmbd_nl_init_fixup(void)
205 {
206 int i;
207
208 for (i = 0; i < ARRAY_SIZE(ksmbd_genl_ops); i++)
209 ksmbd_genl_ops[i].validate = GENL_DONT_VALIDATE_STRICT |
210 GENL_DONT_VALIDATE_DUMP;
211
212 ksmbd_genl_family.policy = ksmbd_nl_policy;
213 }
214
215 static int rpc_context_flags(struct ksmbd_session *sess)
216 {
217 if (user_guest(sess->user))
218 return KSMBD_RPC_RESTRICTED_CONTEXT;
219 return 0;
220 }
221
222 static void ipc_update_last_active(void)
223 {
224 if (server_conf.ipc_timeout)
225 server_conf.ipc_last_active = jiffies;
226 }
227
228 static struct ksmbd_ipc_msg *ipc_msg_alloc(size_t sz)
229 {
230 struct ksmbd_ipc_msg *msg;
231 size_t msg_sz = sz + sizeof(struct ksmbd_ipc_msg);
232
233 msg = kvzalloc(msg_sz, GFP_KERNEL);
234 if (msg)
235 msg->sz = sz;
236 return msg;
237 }
238
239 static void ipc_msg_free(struct ksmbd_ipc_msg *msg)
240 {
241 kvfree(msg);
242 }
243
244 static void ipc_msg_handle_free(int handle)
245 {
246 if (handle >= 0)
247 ksmbd_release_id(&ipc_ida, handle);
248 }
249
250 static int handle_response(int type, void *payload, size_t sz)
251 {
252 unsigned int handle = *(unsigned int *)payload;
253 struct ipc_msg_table_entry *entry;
254 int ret = 0;
255
256 ipc_update_last_active();
257 down_read(&ipc_msg_table_lock);
258 hash_for_each_possible(ipc_msg_table, entry, ipc_table_hlist, handle) {
259 if (handle != entry->handle)
260 continue;
261
262 entry->response = NULL;
263 /*
264 * Response message type value should be equal to
265 * request message type + 1.
266 */
267 if (entry->type + 1 != type) {
268 pr_err("Waiting for IPC type %d, got %d. Ignore.\n",
269 entry->type + 1, type);
270 }
271
272 entry->response = kvzalloc(sz, GFP_KERNEL);
273 if (!entry->response) {
274 ret = -ENOMEM;
275 break;
276 }
277
278 memcpy(entry->response, payload, sz);
279 entry->msg_sz = sz;
280 wake_up_interruptible(&entry->wait);
281 ret = 0;
282 break;
283 }
284 up_read(&ipc_msg_table_lock);
285
286 return ret;
287 }
288
289 static int ipc_server_config_on_startup(struct ksmbd_startup_request *req)
290 {
291 int ret;
292
293 ksmbd_set_fd_limit(req->file_max);
294 server_conf.flags = req->flags;
295 server_conf.signing = req->signing;
296 server_conf.tcp_port = req->tcp_port;
297 server_conf.ipc_timeout = req->ipc_timeout * HZ;
298 server_conf.deadtime = req->deadtime * SMB_ECHO_INTERVAL;
299 server_conf.share_fake_fscaps = req->share_fake_fscaps;
300 ksmbd_init_domain(req->sub_auth);
301
302 if (req->smb2_max_read)
303 init_smb2_max_read_size(req->smb2_max_read);
304 if (req->smb2_max_write)
305 init_smb2_max_write_size(req->smb2_max_write);
306 if (req->smb2_max_trans)
307 init_smb2_max_trans_size(req->smb2_max_trans);
308 if (req->smb2_max_credits)
309 init_smb2_max_credits(req->smb2_max_credits);
310 if (req->smbd_max_io_size)
311 init_smbd_max_io_size(req->smbd_max_io_size);
312
313 if (req->max_connections)
314 server_conf.max_connections = req->max_connections;
315
316 ret = ksmbd_set_netbios_name(req->netbios_name);
317 ret |= ksmbd_set_server_string(req->server_string);
318 ret |= ksmbd_set_work_group(req->work_group);
319 ret |= ksmbd_tcp_set_interfaces(KSMBD_STARTUP_CONFIG_INTERFACES(req),
320 req->ifc_list_sz);
321 if (ret) {
322 pr_err("Server configuration error: %s %s %s\n",
323 req->netbios_name, req->server_string,
324 req->work_group);
325 return ret;
326 }
327
328 if (req->min_prot[0]) {
329 ret = ksmbd_lookup_protocol_idx(req->min_prot);
330 if (ret >= 0)
331 server_conf.min_protocol = ret;
332 }
333 if (req->max_prot[0]) {
334 ret = ksmbd_lookup_protocol_idx(req->max_prot);
335 if (ret >= 0)
336 server_conf.max_protocol = ret;
337 }
338
339 if (server_conf.ipc_timeout)
340 schedule_delayed_work(&ipc_timer_work, server_conf.ipc_timeout);
341 return 0;
342 }
343
344 static int handle_startup_event(struct sk_buff *skb, struct genl_info *info)
345 {
346 int ret = 0;
347
348 #ifdef CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN
349 if (!netlink_capable(skb, CAP_NET_ADMIN))
350 return -EPERM;
351 #endif
352
353 if (!ksmbd_ipc_validate_version(info))
354 return -EINVAL;
355
356 if (!info->attrs[KSMBD_EVENT_STARTING_UP])
357 return -EINVAL;
358
359 mutex_lock(&startup_lock);
360 if (!ksmbd_server_configurable()) {
361 mutex_unlock(&startup_lock);
362 pr_err("Server reset is in progress, can't start daemon\n");
363 return -EINVAL;
364 }
365
366 if (ksmbd_tools_pid) {
367 if (ksmbd_ipc_heartbeat_request() == 0) {
368 ret = -EINVAL;
369 goto out;
370 }
371
372 pr_err("Reconnect to a new user space daemon\n");
373 } else {
374 struct ksmbd_startup_request *req;
375
376 req = nla_data(info->attrs[info->genlhdr->cmd]);
377 ret = ipc_server_config_on_startup(req);
378 if (ret)
379 goto out;
380 server_queue_ctrl_init_work();
381 }
382
383 ksmbd_tools_pid = info->snd_portid;
384 ipc_update_last_active();
385
386 out:
387 mutex_unlock(&startup_lock);
388 return ret;
389 }
390
391 static int handle_unsupported_event(struct sk_buff *skb, struct genl_info *info)
392 {
393 pr_err("Unknown IPC event: %d, ignore.\n", info->genlhdr->cmd);
394 return -EINVAL;
395 }
396
397 static int handle_generic_event(struct sk_buff *skb, struct genl_info *info)
398 {
399 void *payload;
400 int sz;
401 int type = info->genlhdr->cmd;
402
403 #ifdef CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN
404 if (!netlink_capable(skb, CAP_NET_ADMIN))
405 return -EPERM;
406 #endif
407
408 if (type > KSMBD_EVENT_MAX) {
409 WARN_ON(1);
410 return -EINVAL;
411 }
412
413 if (!ksmbd_ipc_validate_version(info))
414 return -EINVAL;
415
416 if (!info->attrs[type])
417 return -EINVAL;
418
419 payload = nla_data(info->attrs[info->genlhdr->cmd]);
420 sz = nla_len(info->attrs[info->genlhdr->cmd]);
421 return handle_response(type, payload, sz);
422 }
423
424 static int ipc_msg_send(struct ksmbd_ipc_msg *msg)
425 {
426 struct genlmsghdr *nlh;
427 struct sk_buff *skb;
428 int ret = -EINVAL;
429
430 if (!ksmbd_tools_pid)
431 return ret;
432
433 skb = genlmsg_new(msg->sz, GFP_KERNEL);
434 if (!skb)
435 return -ENOMEM;
436
437 nlh = genlmsg_put(skb, 0, 0, &ksmbd_genl_family, 0, msg->type);
438 if (!nlh)
439 goto out;
440
441 ret = nla_put(skb, msg->type, msg->sz, msg->payload);
442 if (ret) {
443 genlmsg_cancel(skb, nlh);
444 goto out;
445 }
446
447 genlmsg_end(skb, nlh);
448 ret = genlmsg_unicast(&init_net, skb, ksmbd_tools_pid);
449 if (!ret)
450 ipc_update_last_active();
451 return ret;
452
453 out:
454 nlmsg_free(skb);
455 return ret;
456 }
457
458 static int ipc_validate_msg(struct ipc_msg_table_entry *entry)
459 {
460 unsigned int msg_sz = entry->msg_sz;
461
462 if (entry->type == KSMBD_EVENT_RPC_REQUEST) {
463 struct ksmbd_rpc_command *resp = entry->response;
464
465 msg_sz = sizeof(struct ksmbd_rpc_command) + resp->payload_sz;
466 } else if (entry->type == KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST) {
467 struct ksmbd_spnego_authen_response *resp = entry->response;
468
469 msg_sz = sizeof(struct ksmbd_spnego_authen_response) +
470 resp->session_key_len + resp->spnego_blob_len;
471 } else if (entry->type == KSMBD_EVENT_SHARE_CONFIG_REQUEST) {
472 struct ksmbd_share_config_response *resp = entry->response;
473
474 if (resp->payload_sz) {
475 if (resp->payload_sz < resp->veto_list_sz)
476 return -EINVAL;
477
478 msg_sz = sizeof(struct ksmbd_share_config_response) +
479 resp->payload_sz;
480 }
481 }
482
483 return entry->msg_sz != msg_sz ? -EINVAL : 0;
484 }
485
486 static void *ipc_msg_send_request(struct ksmbd_ipc_msg *msg, unsigned int handle)
487 {
488 struct ipc_msg_table_entry entry;
489 int ret;
490
491 if ((int)handle < 0)
492 return NULL;
493
494 entry.type = msg->type;
495 entry.response = NULL;
496 init_waitqueue_head(&entry.wait);
497
498 down_write(&ipc_msg_table_lock);
499 entry.handle = handle;
500 hash_add(ipc_msg_table, &entry.ipc_table_hlist, entry.handle);
501 up_write(&ipc_msg_table_lock);
502
503 ret = ipc_msg_send(msg);
504 if (ret)
505 goto out;
506
507 ret = wait_event_interruptible_timeout(entry.wait,
508 entry.response != NULL,
509 IPC_WAIT_TIMEOUT);
510 if (entry.response) {
511 ret = ipc_validate_msg(&entry);
512 if (ret) {
513 kvfree(entry.response);
514 entry.response = NULL;
515 }
516 }
517 out:
518 down_write(&ipc_msg_table_lock);
519 hash_del(&entry.ipc_table_hlist);
520 up_write(&ipc_msg_table_lock);
521 return entry.response;
522 }
523
524 static int ksmbd_ipc_heartbeat_request(void)
525 {
526 struct ksmbd_ipc_msg *msg;
527 int ret;
528
529 msg = ipc_msg_alloc(sizeof(struct ksmbd_heartbeat));
530 if (!msg)
531 return -EINVAL;
532
533 msg->type = KSMBD_EVENT_HEARTBEAT_REQUEST;
534 ret = ipc_msg_send(msg);
535 ipc_msg_free(msg);
536 return ret;
537 }
538
539 struct ksmbd_login_response *ksmbd_ipc_login_request(const char *account)
540 {
541 struct ksmbd_ipc_msg *msg;
542 struct ksmbd_login_request *req;
543 struct ksmbd_login_response *resp;
544
545 if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
546 return NULL;
547
548 msg = ipc_msg_alloc(sizeof(struct ksmbd_login_request));
549 if (!msg)
550 return NULL;
551
552 msg->type = KSMBD_EVENT_LOGIN_REQUEST;
553 req = (struct ksmbd_login_request *)msg->payload;
554 req->handle = ksmbd_acquire_id(&ipc_ida);
555 strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
556
557 resp = ipc_msg_send_request(msg, req->handle);
558 ipc_msg_handle_free(req->handle);
559 ipc_msg_free(msg);
560 return resp;
561 }
562
563 struct ksmbd_spnego_authen_response *
564 ksmbd_ipc_spnego_authen_request(const char *spnego_blob, int blob_len)
565 {
566 struct ksmbd_ipc_msg *msg;
567 struct ksmbd_spnego_authen_request *req;
568 struct ksmbd_spnego_authen_response *resp;
569
570 msg = ipc_msg_alloc(sizeof(struct ksmbd_spnego_authen_request) +
571 blob_len + 1);
572 if (!msg)
573 return NULL;
574
575 msg->type = KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST;
576 req = (struct ksmbd_spnego_authen_request *)msg->payload;
577 req->handle = ksmbd_acquire_id(&ipc_ida);
578 req->spnego_blob_len = blob_len;
579 memcpy(req->spnego_blob, spnego_blob, blob_len);
580
581 resp = ipc_msg_send_request(msg, req->handle);
582 ipc_msg_handle_free(req->handle);
583 ipc_msg_free(msg);
584 return resp;
585 }
586
587 struct ksmbd_tree_connect_response *
588 ksmbd_ipc_tree_connect_request(struct ksmbd_session *sess,
589 struct ksmbd_share_config *share,
590 struct ksmbd_tree_connect *tree_conn,
591 struct sockaddr *peer_addr)
592 {
593 struct ksmbd_ipc_msg *msg;
594 struct ksmbd_tree_connect_request *req;
595 struct ksmbd_tree_connect_response *resp;
596
597 if (strlen(user_name(sess->user)) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
598 return NULL;
599
600 if (strlen(share->name) >= KSMBD_REQ_MAX_SHARE_NAME)
601 return NULL;
602
603 msg = ipc_msg_alloc(sizeof(struct ksmbd_tree_connect_request));
604 if (!msg)
605 return NULL;
606
607 msg->type = KSMBD_EVENT_TREE_CONNECT_REQUEST;
608 req = (struct ksmbd_tree_connect_request *)msg->payload;
609
610 req->handle = ksmbd_acquire_id(&ipc_ida);
611 req->account_flags = sess->user->flags;
612 req->session_id = sess->id;
613 req->connect_id = tree_conn->id;
614 strscpy(req->account, user_name(sess->user), KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
615 strscpy(req->share, share->name, KSMBD_REQ_MAX_SHARE_NAME);
616 snprintf(req->peer_addr, sizeof(req->peer_addr), "%pIS", peer_addr);
617
618 if (peer_addr->sa_family == AF_INET6)
619 req->flags |= KSMBD_TREE_CONN_FLAG_REQUEST_IPV6;
620 if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2))
621 req->flags |= KSMBD_TREE_CONN_FLAG_REQUEST_SMB2;
622
623 resp = ipc_msg_send_request(msg, req->handle);
624 ipc_msg_handle_free(req->handle);
625 ipc_msg_free(msg);
626 return resp;
627 }
628
629 int ksmbd_ipc_tree_disconnect_request(unsigned long long session_id,
630 unsigned long long connect_id)
631 {
632 struct ksmbd_ipc_msg *msg;
633 struct ksmbd_tree_disconnect_request *req;
634 int ret;
635
636 msg = ipc_msg_alloc(sizeof(struct ksmbd_tree_disconnect_request));
637 if (!msg)
638 return -ENOMEM;
639
640 msg->type = KSMBD_EVENT_TREE_DISCONNECT_REQUEST;
641 req = (struct ksmbd_tree_disconnect_request *)msg->payload;
642 req->session_id = session_id;
643 req->connect_id = connect_id;
644
645 ret = ipc_msg_send(msg);
646 ipc_msg_free(msg);
647 return ret;
648 }
649
650 int ksmbd_ipc_logout_request(const char *account, int flags)
651 {
652 struct ksmbd_ipc_msg *msg;
653 struct ksmbd_logout_request *req;
654 int ret;
655
656 if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
657 return -EINVAL;
658
659 msg = ipc_msg_alloc(sizeof(struct ksmbd_logout_request));
660 if (!msg)
661 return -ENOMEM;
662
663 msg->type = KSMBD_EVENT_LOGOUT_REQUEST;
664 req = (struct ksmbd_logout_request *)msg->payload;
665 req->account_flags = flags;
666 strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
667
668 ret = ipc_msg_send(msg);
669 ipc_msg_free(msg);
670 return ret;
671 }
672
673 struct ksmbd_share_config_response *
674 ksmbd_ipc_share_config_request(const char *name)
675 {
676 struct ksmbd_ipc_msg *msg;
677 struct ksmbd_share_config_request *req;
678 struct ksmbd_share_config_response *resp;
679
680 if (strlen(name) >= KSMBD_REQ_MAX_SHARE_NAME)
681 return NULL;
682
683 msg = ipc_msg_alloc(sizeof(struct ksmbd_share_config_request));
684 if (!msg)
685 return NULL;
686
687 msg->type = KSMBD_EVENT_SHARE_CONFIG_REQUEST;
688 req = (struct ksmbd_share_config_request *)msg->payload;
689 req->handle = ksmbd_acquire_id(&ipc_ida);
690 strscpy(req->share_name, name, KSMBD_REQ_MAX_SHARE_NAME);
691
692 resp = ipc_msg_send_request(msg, req->handle);
693 ipc_msg_handle_free(req->handle);
694 ipc_msg_free(msg);
695 return resp;
696 }
697
698 struct ksmbd_rpc_command *ksmbd_rpc_open(struct ksmbd_session *sess, int handle)
699 {
700 struct ksmbd_ipc_msg *msg;
701 struct ksmbd_rpc_command *req;
702 struct ksmbd_rpc_command *resp;
703
704 msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
705 if (!msg)
706 return NULL;
707
708 msg->type = KSMBD_EVENT_RPC_REQUEST;
709 req = (struct ksmbd_rpc_command *)msg->payload;
710 req->handle = handle;
711 req->flags = ksmbd_session_rpc_method(sess, handle);
712 req->flags |= KSMBD_RPC_OPEN_METHOD;
713 req->payload_sz = 0;
714
715 resp = ipc_msg_send_request(msg, req->handle);
716 ipc_msg_free(msg);
717 return resp;
718 }
719
720 struct ksmbd_rpc_command *ksmbd_rpc_close(struct ksmbd_session *sess, int handle)
721 {
722 struct ksmbd_ipc_msg *msg;
723 struct ksmbd_rpc_command *req;
724 struct ksmbd_rpc_command *resp;
725
726 msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
727 if (!msg)
728 return NULL;
729
730 msg->type = KSMBD_EVENT_RPC_REQUEST;
731 req = (struct ksmbd_rpc_command *)msg->payload;
732 req->handle = handle;
733 req->flags = ksmbd_session_rpc_method(sess, handle);
734 req->flags |= KSMBD_RPC_CLOSE_METHOD;
735 req->payload_sz = 0;
736
737 resp = ipc_msg_send_request(msg, req->handle);
738 ipc_msg_free(msg);
739 return resp;
740 }
741
742 struct ksmbd_rpc_command *ksmbd_rpc_write(struct ksmbd_session *sess, int handle,
743 void *payload, size_t payload_sz)
744 {
745 struct ksmbd_ipc_msg *msg;
746 struct ksmbd_rpc_command *req;
747 struct ksmbd_rpc_command *resp;
748
749 msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
750 if (!msg)
751 return NULL;
752
753 msg->type = KSMBD_EVENT_RPC_REQUEST;
754 req = (struct ksmbd_rpc_command *)msg->payload;
755 req->handle = handle;
756 req->flags = ksmbd_session_rpc_method(sess, handle);
757 req->flags |= rpc_context_flags(sess);
758 req->flags |= KSMBD_RPC_WRITE_METHOD;
759 req->payload_sz = payload_sz;
760 memcpy(req->payload, payload, payload_sz);
761
762 resp = ipc_msg_send_request(msg, req->handle);
763 ipc_msg_free(msg);
764 return resp;
765 }
766
767 struct ksmbd_rpc_command *ksmbd_rpc_read(struct ksmbd_session *sess, int handle)
768 {
769 struct ksmbd_ipc_msg *msg;
770 struct ksmbd_rpc_command *req;
771 struct ksmbd_rpc_command *resp;
772
773 msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
774 if (!msg)
775 return NULL;
776
777 msg->type = KSMBD_EVENT_RPC_REQUEST;
778 req = (struct ksmbd_rpc_command *)msg->payload;
779 req->handle = handle;
780 req->flags = ksmbd_session_rpc_method(sess, handle);
781 req->flags |= rpc_context_flags(sess);
782 req->flags |= KSMBD_RPC_READ_METHOD;
783 req->payload_sz = 0;
784
785 resp = ipc_msg_send_request(msg, req->handle);
786 ipc_msg_free(msg);
787 return resp;
788 }
789
790 struct ksmbd_rpc_command *ksmbd_rpc_ioctl(struct ksmbd_session *sess, int handle,
791 void *payload, size_t payload_sz)
792 {
793 struct ksmbd_ipc_msg *msg;
794 struct ksmbd_rpc_command *req;
795 struct ksmbd_rpc_command *resp;
796
797 msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
798 if (!msg)
799 return NULL;
800
801 msg->type = KSMBD_EVENT_RPC_REQUEST;
802 req = (struct ksmbd_rpc_command *)msg->payload;
803 req->handle = handle;
804 req->flags = ksmbd_session_rpc_method(sess, handle);
805 req->flags |= rpc_context_flags(sess);
806 req->flags |= KSMBD_RPC_IOCTL_METHOD;
807 req->payload_sz = payload_sz;
808 memcpy(req->payload, payload, payload_sz);
809
810 resp = ipc_msg_send_request(msg, req->handle);
811 ipc_msg_free(msg);
812 return resp;
813 }
814
815 struct ksmbd_rpc_command *ksmbd_rpc_rap(struct ksmbd_session *sess, void *payload,
816 size_t payload_sz)
817 {
818 struct ksmbd_ipc_msg *msg;
819 struct ksmbd_rpc_command *req;
820 struct ksmbd_rpc_command *resp;
821
822 msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
823 if (!msg)
824 return NULL;
825
826 msg->type = KSMBD_EVENT_RPC_REQUEST;
827 req = (struct ksmbd_rpc_command *)msg->payload;
828 req->handle = ksmbd_acquire_id(&ipc_ida);
829 req->flags = rpc_context_flags(sess);
830 req->flags |= KSMBD_RPC_RAP_METHOD;
831 req->payload_sz = payload_sz;
832 memcpy(req->payload, payload, payload_sz);
833
834 resp = ipc_msg_send_request(msg, req->handle);
835 ipc_msg_handle_free(req->handle);
836 ipc_msg_free(msg);
837 return resp;
838 }
839
840 static int __ipc_heartbeat(void)
841 {
842 unsigned long delta;
843
844 if (!ksmbd_server_running())
845 return 0;
846
847 if (time_after(jiffies, server_conf.ipc_last_active)) {
848 delta = (jiffies - server_conf.ipc_last_active);
849 } else {
850 ipc_update_last_active();
851 schedule_delayed_work(&ipc_timer_work,
852 server_conf.ipc_timeout);
853 return 0;
854 }
855
856 if (delta < server_conf.ipc_timeout) {
857 schedule_delayed_work(&ipc_timer_work,
858 server_conf.ipc_timeout - delta);
859 return 0;
860 }
861
862 if (ksmbd_ipc_heartbeat_request() == 0) {
863 schedule_delayed_work(&ipc_timer_work,
864 server_conf.ipc_timeout);
865 return 0;
866 }
867
868 mutex_lock(&startup_lock);
869 WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING);
870 server_conf.ipc_last_active = 0;
871 ksmbd_tools_pid = 0;
872 pr_err("No IPC daemon response for %lus\n", delta / HZ);
873 mutex_unlock(&startup_lock);
874 return -EINVAL;
875 }
876
877 static void ipc_timer_heartbeat(struct work_struct *w)
878 {
879 if (__ipc_heartbeat())
880 server_queue_ctrl_reset_work();
881 }
882
883 int ksmbd_ipc_id_alloc(void)
884 {
885 return ksmbd_acquire_id(&ipc_ida);
886 }
887
888 void ksmbd_rpc_id_free(int handle)
889 {
890 ksmbd_release_id(&ipc_ida, handle);
891 }
892
893 void ksmbd_ipc_release(void)
894 {
895 cancel_delayed_work_sync(&ipc_timer_work);
896 genl_unregister_family(&ksmbd_genl_family);
897 }
898
899 void ksmbd_ipc_soft_reset(void)
900 {
901 mutex_lock(&startup_lock);
902 ksmbd_tools_pid = 0;
903 cancel_delayed_work_sync(&ipc_timer_work);
904 mutex_unlock(&startup_lock);
905 }
906
907 int ksmbd_ipc_init(void)
908 {
909 int ret = 0;
910
911 ksmbd_nl_init_fixup();
912 INIT_DELAYED_WORK(&ipc_timer_work, ipc_timer_heartbeat);
913
914 ret = genl_register_family(&ksmbd_genl_family);
915 if (ret) {
916 pr_err("Failed to register KSMBD netlink interface %d\n", ret);
917 cancel_delayed_work_sync(&ipc_timer_work);
918 }
919
920 return ret;
921 }
922
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