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1 | /* AFS Cache Manager Service | |
2 | * | |
3 | * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
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 | ||
20 | static int afs_deliver_cb_init_call_back_state(struct afs_call *); | |
21 | static int afs_deliver_cb_init_call_back_state3(struct afs_call *); | |
22 | static int afs_deliver_cb_probe(struct afs_call *); | |
23 | static int afs_deliver_cb_callback(struct afs_call *); | |
24 | static int afs_deliver_cb_probe_uuid(struct afs_call *); | |
25 | static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *); | |
26 | static void afs_cm_destructor(struct afs_call *); | |
27 | ||
28 | /* | |
29 | * CB.CallBack operation type | |
30 | */ | |
31 | static const struct afs_call_type afs_SRXCBCallBack = { | |
32 | .name = "CB.CallBack", | |
33 | .deliver = afs_deliver_cb_callback, | |
34 | .abort_to_error = afs_abort_to_error, | |
35 | .destructor = afs_cm_destructor, | |
36 | }; | |
37 | ||
38 | /* | |
39 | * CB.InitCallBackState operation type | |
40 | */ | |
41 | static const struct afs_call_type afs_SRXCBInitCallBackState = { | |
42 | .name = "CB.InitCallBackState", | |
43 | .deliver = afs_deliver_cb_init_call_back_state, | |
44 | .abort_to_error = afs_abort_to_error, | |
45 | .destructor = afs_cm_destructor, | |
46 | }; | |
47 | ||
48 | /* | |
49 | * CB.InitCallBackState3 operation type | |
50 | */ | |
51 | static const struct afs_call_type afs_SRXCBInitCallBackState3 = { | |
52 | .name = "CB.InitCallBackState3", | |
53 | .deliver = afs_deliver_cb_init_call_back_state3, | |
54 | .abort_to_error = afs_abort_to_error, | |
55 | .destructor = afs_cm_destructor, | |
56 | }; | |
57 | ||
58 | /* | |
59 | * CB.Probe operation type | |
60 | */ | |
61 | static const struct afs_call_type afs_SRXCBProbe = { | |
62 | .name = "CB.Probe", | |
63 | .deliver = afs_deliver_cb_probe, | |
64 | .abort_to_error = afs_abort_to_error, | |
65 | .destructor = afs_cm_destructor, | |
66 | }; | |
67 | ||
68 | /* | |
69 | * CB.ProbeUuid operation type | |
70 | */ | |
71 | static const struct afs_call_type afs_SRXCBProbeUuid = { | |
72 | .name = "CB.ProbeUuid", | |
73 | .deliver = afs_deliver_cb_probe_uuid, | |
74 | .abort_to_error = afs_abort_to_error, | |
75 | .destructor = afs_cm_destructor, | |
76 | }; | |
77 | ||
78 | /* | |
79 | * CB.TellMeAboutYourself operation type | |
80 | */ | |
81 | static const struct afs_call_type afs_SRXCBTellMeAboutYourself = { | |
82 | .name = "CB.TellMeAboutYourself", | |
83 | .deliver = afs_deliver_cb_tell_me_about_yourself, | |
84 | .abort_to_error = afs_abort_to_error, | |
85 | .destructor = afs_cm_destructor, | |
86 | }; | |
87 | ||
88 | /* | |
89 | * route an incoming cache manager call | |
90 | * - return T if supported, F if not | |
91 | */ | |
92 | bool afs_cm_incoming_call(struct afs_call *call) | |
93 | { | |
94 | u32 operation_id = ntohl(call->operation_ID); | |
95 | ||
96 | _enter("{CB.OP %u}", operation_id); | |
97 | ||
98 | switch (operation_id) { | |
99 | case CBCallBack: | |
100 | call->type = &afs_SRXCBCallBack; | |
101 | return true; | |
102 | case CBInitCallBackState: | |
103 | call->type = &afs_SRXCBInitCallBackState; | |
104 | return true; | |
105 | case CBInitCallBackState3: | |
106 | call->type = &afs_SRXCBInitCallBackState3; | |
107 | return true; | |
108 | case CBProbe: | |
109 | call->type = &afs_SRXCBProbe; | |
110 | return true; | |
111 | case CBTellMeAboutYourself: | |
112 | call->type = &afs_SRXCBTellMeAboutYourself; | |
113 | return true; | |
114 | default: | |
115 | return false; | |
116 | } | |
117 | } | |
118 | ||
119 | /* | |
120 | * clean up a cache manager call | |
121 | */ | |
122 | static void afs_cm_destructor(struct afs_call *call) | |
123 | { | |
124 | _enter(""); | |
125 | ||
126 | /* Break the callbacks here so that we do it after the final ACK is | |
127 | * received. The step number here must match the final number in | |
128 | * afs_deliver_cb_callback(). | |
129 | */ | |
130 | if (call->unmarshall == 5) { | |
131 | ASSERT(call->server && call->count && call->request); | |
132 | afs_break_callbacks(call->server, call->count, call->request); | |
133 | } | |
134 | ||
135 | afs_put_server(call->server); | |
136 | call->server = NULL; | |
137 | kfree(call->buffer); | |
138 | call->buffer = NULL; | |
139 | } | |
140 | ||
141 | /* | |
142 | * allow the fileserver to see if the cache manager is still alive | |
143 | */ | |
144 | static void SRXAFSCB_CallBack(struct work_struct *work) | |
145 | { | |
146 | struct afs_call *call = container_of(work, struct afs_call, work); | |
147 | ||
148 | _enter(""); | |
149 | ||
150 | /* be sure to send the reply *before* attempting to spam the AFS server | |
151 | * with FSFetchStatus requests on the vnodes with broken callbacks lest | |
152 | * the AFS server get into a vicious cycle of trying to break further | |
153 | * callbacks because it hadn't received completion of the CBCallBack op | |
154 | * yet */ | |
155 | afs_send_empty_reply(call); | |
156 | ||
157 | afs_break_callbacks(call->server, call->count, call->request); | |
158 | _leave(""); | |
159 | } | |
160 | ||
161 | /* | |
162 | * deliver request data to a CB.CallBack call | |
163 | */ | |
164 | static int afs_deliver_cb_callback(struct afs_call *call) | |
165 | { | |
166 | struct sockaddr_rxrpc srx; | |
167 | struct afs_callback *cb; | |
168 | struct afs_server *server; | |
169 | __be32 *bp; | |
170 | u32 tmp; | |
171 | int ret, loop; | |
172 | ||
173 | _enter("{%u}", call->unmarshall); | |
174 | ||
175 | switch (call->unmarshall) { | |
176 | case 0: | |
177 | rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx); | |
178 | call->offset = 0; | |
179 | call->unmarshall++; | |
180 | ||
181 | /* extract the FID array and its count in two steps */ | |
182 | case 1: | |
183 | _debug("extract FID count"); | |
184 | ret = afs_extract_data(call, &call->tmp, 4, true); | |
185 | if (ret < 0) | |
186 | return ret; | |
187 | ||
188 | call->count = ntohl(call->tmp); | |
189 | _debug("FID count: %u", call->count); | |
190 | if (call->count > AFSCBMAX) | |
191 | return -EBADMSG; | |
192 | ||
193 | call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL); | |
194 | if (!call->buffer) | |
195 | return -ENOMEM; | |
196 | call->offset = 0; | |
197 | call->unmarshall++; | |
198 | ||
199 | case 2: | |
200 | _debug("extract FID array"); | |
201 | ret = afs_extract_data(call, call->buffer, | |
202 | call->count * 3 * 4, true); | |
203 | if (ret < 0) | |
204 | return ret; | |
205 | ||
206 | _debug("unmarshall FID array"); | |
207 | call->request = kcalloc(call->count, | |
208 | sizeof(struct afs_callback), | |
209 | GFP_KERNEL); | |
210 | if (!call->request) | |
211 | return -ENOMEM; | |
212 | ||
213 | cb = call->request; | |
214 | bp = call->buffer; | |
215 | for (loop = call->count; loop > 0; loop--, cb++) { | |
216 | cb->fid.vid = ntohl(*bp++); | |
217 | cb->fid.vnode = ntohl(*bp++); | |
218 | cb->fid.unique = ntohl(*bp++); | |
219 | cb->type = AFSCM_CB_UNTYPED; | |
220 | } | |
221 | ||
222 | call->offset = 0; | |
223 | call->unmarshall++; | |
224 | ||
225 | /* extract the callback array and its count in two steps */ | |
226 | case 3: | |
227 | _debug("extract CB count"); | |
228 | ret = afs_extract_data(call, &call->tmp, 4, true); | |
229 | if (ret < 0) | |
230 | return ret; | |
231 | ||
232 | tmp = ntohl(call->tmp); | |
233 | _debug("CB count: %u", tmp); | |
234 | if (tmp != call->count && tmp != 0) | |
235 | return -EBADMSG; | |
236 | call->offset = 0; | |
237 | call->unmarshall++; | |
238 | ||
239 | case 4: | |
240 | _debug("extract CB array"); | |
241 | ret = afs_extract_data(call, call->buffer, | |
242 | call->count * 3 * 4, false); | |
243 | if (ret < 0) | |
244 | return ret; | |
245 | ||
246 | _debug("unmarshall CB array"); | |
247 | cb = call->request; | |
248 | bp = call->buffer; | |
249 | for (loop = call->count; loop > 0; loop--, cb++) { | |
250 | cb->version = ntohl(*bp++); | |
251 | cb->expiry = ntohl(*bp++); | |
252 | cb->type = ntohl(*bp++); | |
253 | } | |
254 | ||
255 | call->offset = 0; | |
256 | call->unmarshall++; | |
257 | ||
258 | /* Record that the message was unmarshalled successfully so | |
259 | * that the call destructor can know do the callback breaking | |
260 | * work, even if the final ACK isn't received. | |
261 | * | |
262 | * If the step number changes, then afs_cm_destructor() must be | |
263 | * updated also. | |
264 | */ | |
265 | call->unmarshall++; | |
266 | case 5: | |
267 | break; | |
268 | } | |
269 | ||
270 | call->state = AFS_CALL_REPLYING; | |
271 | ||
272 | /* we'll need the file server record as that tells us which set of | |
273 | * vnodes to operate upon */ | |
274 | server = afs_find_server(&srx); | |
275 | if (!server) | |
276 | return -ENOTCONN; | |
277 | call->server = server; | |
278 | ||
279 | INIT_WORK(&call->work, SRXAFSCB_CallBack); | |
280 | queue_work(afs_wq, &call->work); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | /* | |
285 | * allow the fileserver to request callback state (re-)initialisation | |
286 | */ | |
287 | static void SRXAFSCB_InitCallBackState(struct work_struct *work) | |
288 | { | |
289 | struct afs_call *call = container_of(work, struct afs_call, work); | |
290 | ||
291 | _enter("{%p}", call->server); | |
292 | ||
293 | afs_init_callback_state(call->server); | |
294 | afs_send_empty_reply(call); | |
295 | _leave(""); | |
296 | } | |
297 | ||
298 | /* | |
299 | * deliver request data to a CB.InitCallBackState call | |
300 | */ | |
301 | static int afs_deliver_cb_init_call_back_state(struct afs_call *call) | |
302 | { | |
303 | struct sockaddr_rxrpc srx; | |
304 | struct afs_server *server; | |
305 | int ret; | |
306 | ||
307 | _enter(""); | |
308 | ||
309 | rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx); | |
310 | ||
311 | ret = afs_extract_data(call, NULL, 0, false); | |
312 | if (ret < 0) | |
313 | return ret; | |
314 | ||
315 | /* no unmarshalling required */ | |
316 | call->state = AFS_CALL_REPLYING; | |
317 | ||
318 | /* we'll need the file server record as that tells us which set of | |
319 | * vnodes to operate upon */ | |
320 | server = afs_find_server(&srx); | |
321 | if (!server) | |
322 | return -ENOTCONN; | |
323 | call->server = server; | |
324 | ||
325 | INIT_WORK(&call->work, SRXAFSCB_InitCallBackState); | |
326 | queue_work(afs_wq, &call->work); | |
327 | return 0; | |
328 | } | |
329 | ||
330 | /* | |
331 | * deliver request data to a CB.InitCallBackState3 call | |
332 | */ | |
333 | static int afs_deliver_cb_init_call_back_state3(struct afs_call *call) | |
334 | { | |
335 | struct sockaddr_rxrpc srx; | |
336 | struct afs_server *server; | |
337 | struct afs_uuid *r; | |
338 | unsigned loop; | |
339 | __be32 *b; | |
340 | int ret; | |
341 | ||
342 | _enter(""); | |
343 | ||
344 | rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx); | |
345 | ||
346 | _enter("{%u}", call->unmarshall); | |
347 | ||
348 | switch (call->unmarshall) { | |
349 | case 0: | |
350 | call->offset = 0; | |
351 | call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL); | |
352 | if (!call->buffer) | |
353 | return -ENOMEM; | |
354 | call->unmarshall++; | |
355 | ||
356 | case 1: | |
357 | _debug("extract UUID"); | |
358 | ret = afs_extract_data(call, call->buffer, | |
359 | 11 * sizeof(__be32), false); | |
360 | switch (ret) { | |
361 | case 0: break; | |
362 | case -EAGAIN: return 0; | |
363 | default: return ret; | |
364 | } | |
365 | ||
366 | _debug("unmarshall UUID"); | |
367 | call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL); | |
368 | if (!call->request) | |
369 | return -ENOMEM; | |
370 | ||
371 | b = call->buffer; | |
372 | r = call->request; | |
373 | r->time_low = ntohl(b[0]); | |
374 | r->time_mid = ntohl(b[1]); | |
375 | r->time_hi_and_version = ntohl(b[2]); | |
376 | r->clock_seq_hi_and_reserved = ntohl(b[3]); | |
377 | r->clock_seq_low = ntohl(b[4]); | |
378 | ||
379 | for (loop = 0; loop < 6; loop++) | |
380 | r->node[loop] = ntohl(b[loop + 5]); | |
381 | ||
382 | call->offset = 0; | |
383 | call->unmarshall++; | |
384 | ||
385 | case 2: | |
386 | break; | |
387 | } | |
388 | ||
389 | /* no unmarshalling required */ | |
390 | call->state = AFS_CALL_REPLYING; | |
391 | ||
392 | /* we'll need the file server record as that tells us which set of | |
393 | * vnodes to operate upon */ | |
394 | server = afs_find_server(&srx); | |
395 | if (!server) | |
396 | return -ENOTCONN; | |
397 | call->server = server; | |
398 | ||
399 | INIT_WORK(&call->work, SRXAFSCB_InitCallBackState); | |
400 | queue_work(afs_wq, &call->work); | |
401 | return 0; | |
402 | } | |
403 | ||
404 | /* | |
405 | * allow the fileserver to see if the cache manager is still alive | |
406 | */ | |
407 | static void SRXAFSCB_Probe(struct work_struct *work) | |
408 | { | |
409 | struct afs_call *call = container_of(work, struct afs_call, work); | |
410 | ||
411 | _enter(""); | |
412 | afs_send_empty_reply(call); | |
413 | _leave(""); | |
414 | } | |
415 | ||
416 | /* | |
417 | * deliver request data to a CB.Probe call | |
418 | */ | |
419 | static int afs_deliver_cb_probe(struct afs_call *call) | |
420 | { | |
421 | int ret; | |
422 | ||
423 | _enter(""); | |
424 | ||
425 | ret = afs_extract_data(call, NULL, 0, false); | |
426 | if (ret < 0) | |
427 | return ret; | |
428 | ||
429 | /* no unmarshalling required */ | |
430 | call->state = AFS_CALL_REPLYING; | |
431 | ||
432 | INIT_WORK(&call->work, SRXAFSCB_Probe); | |
433 | queue_work(afs_wq, &call->work); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | /* | |
438 | * allow the fileserver to quickly find out if the fileserver has been rebooted | |
439 | */ | |
440 | static void SRXAFSCB_ProbeUuid(struct work_struct *work) | |
441 | { | |
442 | struct afs_call *call = container_of(work, struct afs_call, work); | |
443 | struct afs_uuid *r = call->request; | |
444 | ||
445 | struct { | |
446 | __be32 match; | |
447 | } reply; | |
448 | ||
449 | _enter(""); | |
450 | ||
451 | if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0) | |
452 | reply.match = htonl(0); | |
453 | else | |
454 | reply.match = htonl(1); | |
455 | ||
456 | afs_send_simple_reply(call, &reply, sizeof(reply)); | |
457 | _leave(""); | |
458 | } | |
459 | ||
460 | /* | |
461 | * deliver request data to a CB.ProbeUuid call | |
462 | */ | |
463 | static int afs_deliver_cb_probe_uuid(struct afs_call *call) | |
464 | { | |
465 | struct afs_uuid *r; | |
466 | unsigned loop; | |
467 | __be32 *b; | |
468 | int ret; | |
469 | ||
470 | _enter("{%u}", call->unmarshall); | |
471 | ||
472 | switch (call->unmarshall) { | |
473 | case 0: | |
474 | call->offset = 0; | |
475 | call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL); | |
476 | if (!call->buffer) | |
477 | return -ENOMEM; | |
478 | call->unmarshall++; | |
479 | ||
480 | case 1: | |
481 | _debug("extract UUID"); | |
482 | ret = afs_extract_data(call, call->buffer, | |
483 | 11 * sizeof(__be32), false); | |
484 | switch (ret) { | |
485 | case 0: break; | |
486 | case -EAGAIN: return 0; | |
487 | default: return ret; | |
488 | } | |
489 | ||
490 | _debug("unmarshall UUID"); | |
491 | call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL); | |
492 | if (!call->request) | |
493 | return -ENOMEM; | |
494 | ||
495 | b = call->buffer; | |
496 | r = call->request; | |
497 | r->time_low = ntohl(b[0]); | |
498 | r->time_mid = ntohl(b[1]); | |
499 | r->time_hi_and_version = ntohl(b[2]); | |
500 | r->clock_seq_hi_and_reserved = ntohl(b[3]); | |
501 | r->clock_seq_low = ntohl(b[4]); | |
502 | ||
503 | for (loop = 0; loop < 6; loop++) | |
504 | r->node[loop] = ntohl(b[loop + 5]); | |
505 | ||
506 | call->offset = 0; | |
507 | call->unmarshall++; | |
508 | ||
509 | case 2: | |
510 | break; | |
511 | } | |
512 | ||
513 | call->state = AFS_CALL_REPLYING; | |
514 | ||
515 | INIT_WORK(&call->work, SRXAFSCB_ProbeUuid); | |
516 | queue_work(afs_wq, &call->work); | |
517 | return 0; | |
518 | } | |
519 | ||
520 | /* | |
521 | * allow the fileserver to ask about the cache manager's capabilities | |
522 | */ | |
523 | static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work) | |
524 | { | |
525 | struct afs_interface *ifs; | |
526 | struct afs_call *call = container_of(work, struct afs_call, work); | |
527 | int loop, nifs; | |
528 | ||
529 | struct { | |
530 | struct /* InterfaceAddr */ { | |
531 | __be32 nifs; | |
532 | __be32 uuid[11]; | |
533 | __be32 ifaddr[32]; | |
534 | __be32 netmask[32]; | |
535 | __be32 mtu[32]; | |
536 | } ia; | |
537 | struct /* Capabilities */ { | |
538 | __be32 capcount; | |
539 | __be32 caps[1]; | |
540 | } cap; | |
541 | } reply; | |
542 | ||
543 | _enter(""); | |
544 | ||
545 | nifs = 0; | |
546 | ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL); | |
547 | if (ifs) { | |
548 | nifs = afs_get_ipv4_interfaces(ifs, 32, false); | |
549 | if (nifs < 0) { | |
550 | kfree(ifs); | |
551 | ifs = NULL; | |
552 | nifs = 0; | |
553 | } | |
554 | } | |
555 | ||
556 | memset(&reply, 0, sizeof(reply)); | |
557 | reply.ia.nifs = htonl(nifs); | |
558 | ||
559 | reply.ia.uuid[0] = htonl(afs_uuid.time_low); | |
560 | reply.ia.uuid[1] = htonl(afs_uuid.time_mid); | |
561 | reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version); | |
562 | reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved); | |
563 | reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low); | |
564 | for (loop = 0; loop < 6; loop++) | |
565 | reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]); | |
566 | ||
567 | if (ifs) { | |
568 | for (loop = 0; loop < nifs; loop++) { | |
569 | reply.ia.ifaddr[loop] = ifs[loop].address.s_addr; | |
570 | reply.ia.netmask[loop] = ifs[loop].netmask.s_addr; | |
571 | reply.ia.mtu[loop] = htonl(ifs[loop].mtu); | |
572 | } | |
573 | kfree(ifs); | |
574 | } | |
575 | ||
576 | reply.cap.capcount = htonl(1); | |
577 | reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION); | |
578 | afs_send_simple_reply(call, &reply, sizeof(reply)); | |
579 | ||
580 | _leave(""); | |
581 | } | |
582 | ||
583 | /* | |
584 | * deliver request data to a CB.TellMeAboutYourself call | |
585 | */ | |
586 | static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call) | |
587 | { | |
588 | int ret; | |
589 | ||
590 | _enter(""); | |
591 | ||
592 | ret = afs_extract_data(call, NULL, 0, false); | |
593 | if (ret < 0) | |
594 | return ret; | |
595 | ||
596 | /* no unmarshalling required */ | |
597 | call->state = AFS_CALL_REPLYING; | |
598 | ||
599 | INIT_WORK(&call->work, SRXAFSCB_TellMeAboutYourself); | |
600 | queue_work(afs_wq, &call->work); | |
601 | return 0; | |
602 | } |