1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Namjae Jeon <namjae.jeon@protocolfreedom.org>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include <linux/mutex.h>
#include <linux/freezer.h>
#include <linux/module.h>
#include "server.h"
#include "smb_common.h"
#include "mgmt/ksmbd_ida.h"
#include "connection.h"
#include "transport_tcp.h"
#include "transport_rdma.h"
static DEFINE_MUTEX(init_lock);
static struct ksmbd_conn_ops default_conn_ops;
LIST_HEAD(conn_list);
DEFINE_RWLOCK(conn_list_lock);
/**
* ksmbd_conn_free() - free resources of the connection instance
*
* @conn: connection instance to be cleand up
*
* During the thread termination, the corresponding conn instance
* resources(sock/memory) are released and finally the conn object is freed.
*/
void ksmbd_conn_free(struct ksmbd_conn *conn)
{
write_lock(&conn_list_lock);
list_del(&conn->conns_list);
write_unlock(&conn_list_lock);
xa_destroy(&conn->sessions);
kvfree(conn->request_buf);
kfree(conn->preauth_info);
kfree(conn);
}
/**
* ksmbd_conn_alloc() - initialize a new connection instance
*
* Return: ksmbd_conn struct on success, otherwise NULL
*/
struct ksmbd_conn *ksmbd_conn_alloc(void)
{
struct ksmbd_conn *conn;
conn = kzalloc(sizeof(struct ksmbd_conn), GFP_KERNEL);
if (!conn)
return NULL;
conn->need_neg = true;
conn->status = KSMBD_SESS_NEW;
conn->local_nls = load_nls("utf8");
if (!conn->local_nls)
conn->local_nls = load_nls_default();
if (IS_ENABLED(CONFIG_UNICODE))
conn->um = utf8_load(UNICODE_AGE(12, 1, 0));
else
conn->um = ERR_PTR(-EOPNOTSUPP);
if (IS_ERR(conn->um))
conn->um = NULL;
atomic_set(&conn->req_running, 0);
atomic_set(&conn->r_count, 0);
conn->total_credits = 1;
conn->outstanding_credits = 0;
init_waitqueue_head(&conn->req_running_q);
init_waitqueue_head(&conn->r_count_q);
INIT_LIST_HEAD(&conn->conns_list);
INIT_LIST_HEAD(&conn->requests);
INIT_LIST_HEAD(&conn->async_requests);
spin_lock_init(&conn->request_lock);
spin_lock_init(&conn->credits_lock);
ida_init(&conn->async_ida);
xa_init(&conn->sessions);
spin_lock_init(&conn->llist_lock);
INIT_LIST_HEAD(&conn->lock_list);
write_lock(&conn_list_lock);
list_add(&conn->conns_list, &conn_list);
write_unlock(&conn_list_lock);
return conn;
}
bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
{
struct ksmbd_conn *t;
bool ret = false;
read_lock(&conn_list_lock);
list_for_each_entry(t, &conn_list, conns_list) {
if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
continue;
ret = true;
break;
}
read_unlock(&conn_list_lock);
return ret;
}
void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
{
struct ksmbd_conn *conn = work->conn;
struct list_head *requests_queue = NULL;
if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE) {
requests_queue = &conn->requests;
work->synchronous = true;
}
if (requests_queue) {
atomic_inc(&conn->req_running);
spin_lock(&conn->request_lock);
list_add_tail(&work->request_entry, requests_queue);
spin_unlock(&conn->request_lock);
}
}
int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
{
struct ksmbd_conn *conn = work->conn;
int ret = 1;
if (list_empty(&work->request_entry) &&
list_empty(&work->async_request_entry))
return 0;
if (!work->multiRsp)
atomic_dec(&conn->req_running);
spin_lock(&conn->request_lock);
if (!work->multiRsp) {
list_del_init(&work->request_entry);
if (!work->synchronous)
list_del_init(&work->async_request_entry);
ret = 0;
}
spin_unlock(&conn->request_lock);
wake_up_all(&conn->req_running_q);
return ret;
}
static void ksmbd_conn_lock(struct ksmbd_conn *conn)
{
mutex_lock(&conn->srv_mutex);
}
static void ksmbd_conn_unlock(struct ksmbd_conn *conn)
{
mutex_unlock(&conn->srv_mutex);
}
void ksmbd_conn_wait_idle(struct ksmbd_conn *conn)
{
wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
}
int ksmbd_conn_write(struct ksmbd_work *work)
{
struct ksmbd_conn *conn = work->conn;
size_t len = 0;
int sent;
struct kvec iov[3];
int iov_idx = 0;
if (!work->response_buf) {
pr_err("NULL response header\n");
return -EINVAL;
}
if (work->tr_buf) {
iov[iov_idx] = (struct kvec) { work->tr_buf,
sizeof(struct smb2_transform_hdr) + 4 };
len += iov[iov_idx++].iov_len;
}
if (work->aux_payload_sz) {
iov[iov_idx] = (struct kvec) { work->response_buf, work->resp_hdr_sz };
len += iov[iov_idx++].iov_len;
iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
len += iov[iov_idx++].iov_len;
} else {
if (work->tr_buf)
iov[iov_idx].iov_len = work->resp_hdr_sz;
else
iov[iov_idx].iov_len = get_rfc1002_len(work->response_buf) + 4;
iov[iov_idx].iov_base = work->response_buf;
len += iov[iov_idx++].iov_len;
}
ksmbd_conn_lock(conn);
sent = conn->transport->ops->writev(conn->transport, &iov[0],
iov_idx, len,
work->need_invalidate_rkey,
work->remote_key);
ksmbd_conn_unlock(conn);
if (sent < 0) {
pr_err("Failed to send message: %d\n", sent);
return sent;
}
return 0;
}
int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
void *buf, unsigned int buflen,
struct smb2_buffer_desc_v1 *desc,
unsigned int desc_len)
{
int ret = -EINVAL;
if (conn->transport->ops->rdma_read)
ret = conn->transport->ops->rdma_read(conn->transport,
buf, buflen,
desc, desc_len);
return ret;
}
int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
void *buf, unsigned int buflen,
struct smb2_buffer_desc_v1 *desc,
unsigned int desc_len)
{
int ret = -EINVAL;
if (conn->transport->ops->rdma_write)
ret = conn->transport->ops->rdma_write(conn->transport,
buf, buflen,
desc, desc_len);
return ret;
}
bool ksmbd_conn_alive(struct ksmbd_conn *conn)
{
if (!ksmbd_server_running())
return false;
if (conn->status == KSMBD_SESS_EXITING)
return false;
if (kthread_should_stop())
return false;
if (atomic_read(&conn->stats.open_files_count) > 0)
return true;
/*
* Stop current session if the time that get last request from client
* is bigger than deadtime user configured and opening file count is
* zero.
*/
if (server_conf.deadtime > 0 &&
time_after(jiffies, conn->last_active + server_conf.deadtime)) {
ksmbd_debug(CONN, "No response from client in %lu minutes\n",
server_conf.deadtime / SMB_ECHO_INTERVAL);
return false;
}
return true;
}
/**
* ksmbd_conn_handler_loop() - session thread to listen on new smb requests
* @p: connection instance
*
* One thread each per connection
*
* Return: 0 on success
*/
int ksmbd_conn_handler_loop(void *p)
{
struct ksmbd_conn *conn = (struct ksmbd_conn *)p;
struct ksmbd_transport *t = conn->transport;
unsigned int pdu_size, max_allowed_pdu_size;
char hdr_buf[4] = {0,};
int size;
mutex_init(&conn->srv_mutex);
__module_get(THIS_MODULE);
if (t->ops->prepare && t->ops->prepare(t))
goto out;
conn->last_active = jiffies;
while (ksmbd_conn_alive(conn)) {
if (try_to_freeze())
continue;
kvfree(conn->request_buf);
conn->request_buf = NULL;
size = t->ops->read(t, hdr_buf, sizeof(hdr_buf), -1);
if (size != sizeof(hdr_buf))
break;
pdu_size = get_rfc1002_len(hdr_buf);
ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
if (conn->status == KSMBD_SESS_GOOD)
max_allowed_pdu_size =
SMB3_MAX_MSGSIZE + conn->vals->max_write_size;
else
max_allowed_pdu_size = SMB3_MAX_MSGSIZE;
if (pdu_size > max_allowed_pdu_size) {
pr_err_ratelimited("PDU length(%u) exceeded maximum allowed pdu size(%u) on connection(%d)\n",
pdu_size, max_allowed_pdu_size,
conn->status);
break;
}
/*
* Check if pdu size is valid (min : smb header size,
* max : 0x00FFFFFF).
*/
if (pdu_size < __SMB2_HEADER_STRUCTURE_SIZE ||
pdu_size > MAX_STREAM_PROT_LEN) {
break;
}
/* 4 for rfc1002 length field */
size = pdu_size + 4;
conn->request_buf = kvmalloc(size,
GFP_KERNEL |
__GFP_NOWARN |
__GFP_NORETRY);
if (!conn->request_buf)
break;
memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
if (!ksmbd_smb_request(conn))
break;
/*
* We already read 4 bytes to find out PDU size, now
* read in PDU
*/
size = t->ops->read(t, conn->request_buf + 4, pdu_size, 2);
if (size < 0) {
pr_err("sock_read failed: %d\n", size);
break;
}
if (size != pdu_size) {
pr_err("PDU error. Read: %d, Expected: %d\n",
size, pdu_size);
continue;
}
if (!default_conn_ops.process_fn) {
pr_err("No connection request callback\n");
break;
}
if (default_conn_ops.process_fn(conn)) {
pr_err("Cannot handle request\n");
break;
}
}
out:
/* Wait till all reference dropped to the Server object*/
wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);
if (IS_ENABLED(CONFIG_UNICODE))
utf8_unload(conn->um);
unload_nls(conn->local_nls);
if (default_conn_ops.terminate_fn)
default_conn_ops.terminate_fn(conn);
t->ops->disconnect(t);
module_put(THIS_MODULE);
return 0;
}
void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
{
default_conn_ops.process_fn = ops->process_fn;
default_conn_ops.terminate_fn = ops->terminate_fn;
}
int ksmbd_conn_transport_init(void)
{
int ret;
mutex_lock(&init_lock);
ret = ksmbd_tcp_init();
if (ret) {
pr_err("Failed to init TCP subsystem: %d\n", ret);
goto out;
}
ret = ksmbd_rdma_init();
if (ret) {
pr_err("Failed to init RDMA subsystem: %d\n", ret);
goto out;
}
out:
mutex_unlock(&init_lock);
return ret;
}
static void stop_sessions(void)
{
struct ksmbd_conn *conn;
struct ksmbd_transport *t;
again:
read_lock(&conn_list_lock);
list_for_each_entry(conn, &conn_list, conns_list) {
struct task_struct *task;
t = conn->transport;
task = t->handler;
if (task)
ksmbd_debug(CONN, "Stop session handler %s/%d\n",
task->comm, task_pid_nr(task));
conn->status = KSMBD_SESS_EXITING;
if (t->ops->shutdown) {
read_unlock(&conn_list_lock);
t->ops->shutdown(t);
read_lock(&conn_list_lock);
}
}
read_unlock(&conn_list_lock);
if (!list_empty(&conn_list)) {
schedule_timeout_interruptible(HZ / 10); /* 100ms */
goto again;
}
}
void ksmbd_conn_transport_destroy(void)
{
mutex_lock(&init_lock);
ksmbd_tcp_destroy();
ksmbd_rdma_destroy();
stop_sessions();
mutex_unlock(&init_lock);
}
|