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12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/sched.h>
16#include <linux/ip.h>
17#include "internal.h"
18#include "afs_cm.h"
19
20static int afs_deliver_cb_init_call_back_state(struct afs_call *);
21static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
22static int afs_deliver_cb_probe(struct afs_call *);
23static int afs_deliver_cb_callback(struct afs_call *);
24static int afs_deliver_cb_probe_uuid(struct afs_call *);
25static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
26static void afs_cm_destructor(struct afs_call *);
27static void SRXAFSCB_CallBack(struct work_struct *);
28static void SRXAFSCB_InitCallBackState(struct work_struct *);
29static void SRXAFSCB_Probe(struct work_struct *);
30static void SRXAFSCB_ProbeUuid(struct work_struct *);
31static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
32
33#define CM_NAME(name) \
34 const char afs_SRXCB##name##_name[] __tracepoint_string = \
35 "CB." #name
36
37
38
39
40static CM_NAME(CallBack);
41static const struct afs_call_type afs_SRXCBCallBack = {
42 .name = afs_SRXCBCallBack_name,
43 .deliver = afs_deliver_cb_callback,
44 .destructor = afs_cm_destructor,
45 .work = SRXAFSCB_CallBack,
46};
47
48
49
50
51static CM_NAME(InitCallBackState);
52static const struct afs_call_type afs_SRXCBInitCallBackState = {
53 .name = afs_SRXCBInitCallBackState_name,
54 .deliver = afs_deliver_cb_init_call_back_state,
55 .destructor = afs_cm_destructor,
56 .work = SRXAFSCB_InitCallBackState,
57};
58
59
60
61
62static CM_NAME(InitCallBackState3);
63static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
64 .name = afs_SRXCBInitCallBackState3_name,
65 .deliver = afs_deliver_cb_init_call_back_state3,
66 .destructor = afs_cm_destructor,
67 .work = SRXAFSCB_InitCallBackState,
68};
69
70
71
72
73static CM_NAME(Probe);
74static const struct afs_call_type afs_SRXCBProbe = {
75 .name = afs_SRXCBProbe_name,
76 .deliver = afs_deliver_cb_probe,
77 .destructor = afs_cm_destructor,
78 .work = SRXAFSCB_Probe,
79};
80
81
82
83
84static CM_NAME(ProbeUuid);
85static const struct afs_call_type afs_SRXCBProbeUuid = {
86 .name = afs_SRXCBProbeUuid_name,
87 .deliver = afs_deliver_cb_probe_uuid,
88 .destructor = afs_cm_destructor,
89 .work = SRXAFSCB_ProbeUuid,
90};
91
92
93
94
95static CM_NAME(TellMeAboutYourself);
96static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
97 .name = afs_SRXCBTellMeAboutYourself_name,
98 .deliver = afs_deliver_cb_tell_me_about_yourself,
99 .destructor = afs_cm_destructor,
100 .work = SRXAFSCB_TellMeAboutYourself,
101};
102
103
104
105
106
107bool afs_cm_incoming_call(struct afs_call *call)
108{
109 _enter("{CB.OP %u}", call->operation_ID);
110
111 switch (call->operation_ID) {
112 case CBCallBack:
113 call->type = &afs_SRXCBCallBack;
114 return true;
115 case CBInitCallBackState:
116 call->type = &afs_SRXCBInitCallBackState;
117 return true;
118 case CBInitCallBackState3:
119 call->type = &afs_SRXCBInitCallBackState3;
120 return true;
121 case CBProbe:
122 call->type = &afs_SRXCBProbe;
123 return true;
124 case CBProbeUuid:
125 call->type = &afs_SRXCBProbeUuid;
126 return true;
127 case CBTellMeAboutYourself:
128 call->type = &afs_SRXCBTellMeAboutYourself;
129 return true;
130 default:
131 return false;
132 }
133}
134
135
136
137
138static void afs_cm_destructor(struct afs_call *call)
139{
140 kfree(call->buffer);
141 call->buffer = NULL;
142}
143
144
145
146
147static void SRXAFSCB_CallBack(struct work_struct *work)
148{
149 struct afs_call *call = container_of(work, struct afs_call, work);
150
151 _enter("");
152
153
154
155
156
157 if (call->cm_server)
158 afs_break_callbacks(call->cm_server, call->count, call->request);
159
160 afs_send_empty_reply(call);
161 afs_put_call(call);
162 _leave("");
163}
164
165
166
167
168static int afs_deliver_cb_callback(struct afs_call *call)
169{
170 struct afs_callback_break *cb;
171 struct sockaddr_rxrpc srx;
172 __be32 *bp;
173 int ret, loop;
174
175 _enter("{%u}", call->unmarshall);
176
177 switch (call->unmarshall) {
178 case 0:
179 call->offset = 0;
180 call->unmarshall++;
181
182
183 case 1:
184 _debug("extract FID count");
185 ret = afs_extract_data(call, &call->tmp, 4, true);
186 if (ret < 0)
187 return ret;
188
189 call->count = ntohl(call->tmp);
190 _debug("FID count: %u", call->count);
191 if (call->count > AFSCBMAX)
192 return afs_protocol_error(call, -EBADMSG);
193
194 call->buffer = kmalloc(array3_size(call->count, 3, 4),
195 GFP_KERNEL);
196 if (!call->buffer)
197 return -ENOMEM;
198 call->offset = 0;
199 call->unmarshall++;
200
201 case 2:
202 _debug("extract FID array");
203 ret = afs_extract_data(call, call->buffer,
204 call->count * 3 * 4, true);
205 if (ret < 0)
206 return ret;
207
208 _debug("unmarshall FID array");
209 call->request = kcalloc(call->count,
210 sizeof(struct afs_callback_break),
211 GFP_KERNEL);
212 if (!call->request)
213 return -ENOMEM;
214
215 cb = call->request;
216 bp = call->buffer;
217 for (loop = call->count; loop > 0; loop--, cb++) {
218 cb->fid.vid = ntohl(*bp++);
219 cb->fid.vnode = ntohl(*bp++);
220 cb->fid.unique = ntohl(*bp++);
221 cb->cb.type = AFSCM_CB_UNTYPED;
222 }
223
224 call->offset = 0;
225 call->unmarshall++;
226
227
228 case 3:
229 _debug("extract CB count");
230 ret = afs_extract_data(call, &call->tmp, 4, true);
231 if (ret < 0)
232 return ret;
233
234 call->count2 = ntohl(call->tmp);
235 _debug("CB count: %u", call->count2);
236 if (call->count2 != call->count && call->count2 != 0)
237 return afs_protocol_error(call, -EBADMSG);
238 call->offset = 0;
239 call->unmarshall++;
240
241 case 4:
242 _debug("extract CB array");
243 ret = afs_extract_data(call, call->buffer,
244 call->count2 * 3 * 4, false);
245 if (ret < 0)
246 return ret;
247
248 _debug("unmarshall CB array");
249 cb = call->request;
250 bp = call->buffer;
251 for (loop = call->count2; loop > 0; loop--, cb++) {
252 cb->cb.version = ntohl(*bp++);
253 cb->cb.expiry = ntohl(*bp++);
254 cb->cb.type = ntohl(*bp++);
255 }
256
257 call->offset = 0;
258 call->unmarshall++;
259 case 5:
260 break;
261 }
262
263 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
264 return -EIO;
265
266
267
268 rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
269 call->cm_server = afs_find_server(call->net, &srx);
270 if (!call->cm_server)
271 trace_afs_cm_no_server(call, &srx);
272
273 return afs_queue_call_work(call);
274}
275
276
277
278
279static void SRXAFSCB_InitCallBackState(struct work_struct *work)
280{
281 struct afs_call *call = container_of(work, struct afs_call, work);
282
283 _enter("{%p}", call->cm_server);
284
285 if (call->cm_server)
286 afs_init_callback_state(call->cm_server);
287 afs_send_empty_reply(call);
288 afs_put_call(call);
289 _leave("");
290}
291
292
293
294
295static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
296{
297 struct sockaddr_rxrpc srx;
298 int ret;
299
300 _enter("");
301
302 rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
303
304 ret = afs_extract_data(call, NULL, 0, false);
305 if (ret < 0)
306 return ret;
307
308
309
310 call->cm_server = afs_find_server(call->net, &srx);
311 if (!call->cm_server)
312 trace_afs_cm_no_server(call, &srx);
313
314 return afs_queue_call_work(call);
315}
316
317
318
319
320static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
321{
322 struct afs_uuid *r;
323 unsigned loop;
324 __be32 *b;
325 int ret;
326
327 _enter("");
328
329 _enter("{%u}", call->unmarshall);
330
331 switch (call->unmarshall) {
332 case 0:
333 call->offset = 0;
334 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
335 if (!call->buffer)
336 return -ENOMEM;
337 call->unmarshall++;
338
339 case 1:
340 _debug("extract UUID");
341 ret = afs_extract_data(call, call->buffer,
342 11 * sizeof(__be32), false);
343 switch (ret) {
344 case 0: break;
345 case -EAGAIN: return 0;
346 default: return ret;
347 }
348
349 _debug("unmarshall UUID");
350 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
351 if (!call->request)
352 return -ENOMEM;
353
354 b = call->buffer;
355 r = call->request;
356 r->time_low = b[0];
357 r->time_mid = htons(ntohl(b[1]));
358 r->time_hi_and_version = htons(ntohl(b[2]));
359 r->clock_seq_hi_and_reserved = ntohl(b[3]);
360 r->clock_seq_low = ntohl(b[4]);
361
362 for (loop = 0; loop < 6; loop++)
363 r->node[loop] = ntohl(b[loop + 5]);
364
365 call->offset = 0;
366 call->unmarshall++;
367
368 case 2:
369 break;
370 }
371
372 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
373 return -EIO;
374
375
376
377 rcu_read_lock();
378 call->cm_server = afs_find_server_by_uuid(call->net, call->request);
379 rcu_read_unlock();
380 if (!call->cm_server)
381 trace_afs_cm_no_server_u(call, call->request);
382
383 return afs_queue_call_work(call);
384}
385
386
387
388
389static void SRXAFSCB_Probe(struct work_struct *work)
390{
391 struct afs_call *call = container_of(work, struct afs_call, work);
392
393 _enter("");
394 afs_send_empty_reply(call);
395 afs_put_call(call);
396 _leave("");
397}
398
399
400
401
402static int afs_deliver_cb_probe(struct afs_call *call)
403{
404 int ret;
405
406 _enter("");
407
408 ret = afs_extract_data(call, NULL, 0, false);
409 if (ret < 0)
410 return ret;
411
412 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
413 return -EIO;
414
415 return afs_queue_call_work(call);
416}
417
418
419
420
421static void SRXAFSCB_ProbeUuid(struct work_struct *work)
422{
423 struct afs_call *call = container_of(work, struct afs_call, work);
424 struct afs_uuid *r = call->request;
425
426 struct {
427 __be32 match;
428 } reply;
429
430 _enter("");
431
432 if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
433 reply.match = htonl(0);
434 else
435 reply.match = htonl(1);
436
437 afs_send_simple_reply(call, &reply, sizeof(reply));
438 afs_put_call(call);
439 _leave("");
440}
441
442
443
444
445static int afs_deliver_cb_probe_uuid(struct afs_call *call)
446{
447 struct afs_uuid *r;
448 unsigned loop;
449 __be32 *b;
450 int ret;
451
452 _enter("{%u}", call->unmarshall);
453
454 switch (call->unmarshall) {
455 case 0:
456 call->offset = 0;
457 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
458 if (!call->buffer)
459 return -ENOMEM;
460 call->unmarshall++;
461
462 case 1:
463 _debug("extract UUID");
464 ret = afs_extract_data(call, call->buffer,
465 11 * sizeof(__be32), false);
466 switch (ret) {
467 case 0: break;
468 case -EAGAIN: return 0;
469 default: return ret;
470 }
471
472 _debug("unmarshall UUID");
473 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
474 if (!call->request)
475 return -ENOMEM;
476
477 b = call->buffer;
478 r = call->request;
479 r->time_low = b[0];
480 r->time_mid = htons(ntohl(b[1]));
481 r->time_hi_and_version = htons(ntohl(b[2]));
482 r->clock_seq_hi_and_reserved = ntohl(b[3]);
483 r->clock_seq_low = ntohl(b[4]);
484
485 for (loop = 0; loop < 6; loop++)
486 r->node[loop] = ntohl(b[loop + 5]);
487
488 call->offset = 0;
489 call->unmarshall++;
490
491 case 2:
492 break;
493 }
494
495 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
496 return -EIO;
497
498 return afs_queue_call_work(call);
499}
500
501
502
503
504static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
505{
506 struct afs_call *call = container_of(work, struct afs_call, work);
507 int loop;
508
509 struct {
510 struct {
511 __be32 nifs;
512 __be32 uuid[11];
513 __be32 ifaddr[32];
514 __be32 netmask[32];
515 __be32 mtu[32];
516 } ia;
517 struct {
518 __be32 capcount;
519 __be32 caps[1];
520 } cap;
521 } reply;
522
523 _enter("");
524
525 memset(&reply, 0, sizeof(reply));
526
527 reply.ia.uuid[0] = call->net->uuid.time_low;
528 reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
529 reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
530 reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
531 reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
532 for (loop = 0; loop < 6; loop++)
533 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
534
535 reply.cap.capcount = htonl(1);
536 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
537 afs_send_simple_reply(call, &reply, sizeof(reply));
538 afs_put_call(call);
539 _leave("");
540}
541
542
543
544
545static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
546{
547 int ret;
548
549 _enter("");
550
551 ret = afs_extract_data(call, NULL, 0, false);
552 if (ret < 0)
553 return ret;
554
555 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
556 return -EIO;
557
558 return afs_queue_call_work(call);
559}
560
