1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* AFS Volume Location Service client
3 *
4 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/gfp.h>
9 #include <linux/init.h>
10 #include <linux/sched.h>
11 #include "afs_fs.h"
12 #include "internal.h"
13
14 /*
15 * Deliver reply data to a VL.GetEntryByNameU call.
16 */
afs_deliver_vl_get_entry_by_name_u(struct afs_call * call)17 static int afs_deliver_vl_get_entry_by_name_u(struct afs_call *call)
18 {
19 struct afs_uvldbentry__xdr *uvldb;
20 struct afs_vldb_entry *entry;
21 bool new_only = false;
22 u32 tmp, nr_servers, vlflags;
23 int i, ret;
24
25 _enter("");
26
27 ret = afs_transfer_reply(call);
28 if (ret < 0)
29 return ret;
30
31 /* unmarshall the reply once we've received all of it */
32 uvldb = call->buffer;
33 entry = call->ret_vldb;
34
35 nr_servers = ntohl(uvldb->nServers);
36 if (nr_servers > AFS_NMAXNSERVERS)
37 nr_servers = AFS_NMAXNSERVERS;
38
39 for (i = 0; i < ARRAY_SIZE(uvldb->name) - 1; i++)
40 entry->name[i] = (u8)ntohl(uvldb->name[i]);
41 entry->name[i] = 0;
42 entry->name_len = strlen(entry->name);
43
44 /* If there is a new replication site that we can use, ignore all the
45 * sites that aren't marked as new.
46 */
47 for (i = 0; i < nr_servers; i++) {
48 tmp = ntohl(uvldb->serverFlags[i]);
49 if (!(tmp & AFS_VLSF_DONTUSE) &&
50 (tmp & AFS_VLSF_NEWREPSITE))
51 new_only = true;
52 }
53
54 vlflags = ntohl(uvldb->flags);
55 for (i = 0; i < nr_servers; i++) {
56 struct afs_uuid__xdr *xdr;
57 struct afs_uuid *uuid;
58 int j;
59 int n = entry->nr_servers;
60
61 tmp = ntohl(uvldb->serverFlags[i]);
62 if (tmp & AFS_VLSF_DONTUSE ||
63 (new_only && !(tmp & AFS_VLSF_NEWREPSITE)))
64 continue;
65 if (tmp & AFS_VLSF_RWVOL) {
66 entry->fs_mask[n] |= AFS_VOL_VTM_RW;
67 if (vlflags & AFS_VLF_BACKEXISTS)
68 entry->fs_mask[n] |= AFS_VOL_VTM_BAK;
69 }
70 if (tmp & AFS_VLSF_ROVOL)
71 entry->fs_mask[n] |= AFS_VOL_VTM_RO;
72 if (!entry->fs_mask[n])
73 continue;
74
75 xdr = &uvldb->serverNumber[i];
76 uuid = (struct afs_uuid *)&entry->fs_server[n];
77 uuid->time_low = xdr->time_low;
78 uuid->time_mid = htons(ntohl(xdr->time_mid));
79 uuid->time_hi_and_version = htons(ntohl(xdr->time_hi_and_version));
80 uuid->clock_seq_hi_and_reserved = (u8)ntohl(xdr->clock_seq_hi_and_reserved);
81 uuid->clock_seq_low = (u8)ntohl(xdr->clock_seq_low);
82 for (j = 0; j < 6; j++)
83 uuid->node[j] = (u8)ntohl(xdr->node[j]);
84
85 entry->addr_version[n] = ntohl(uvldb->serverUnique[i]);
86 entry->nr_servers++;
87 }
88
89 for (i = 0; i < AFS_MAXTYPES; i++)
90 entry->vid[i] = ntohl(uvldb->volumeId[i]);
91
92 if (vlflags & AFS_VLF_RWEXISTS)
93 __set_bit(AFS_VLDB_HAS_RW, &entry->flags);
94 if (vlflags & AFS_VLF_ROEXISTS)
95 __set_bit(AFS_VLDB_HAS_RO, &entry->flags);
96 if (vlflags & AFS_VLF_BACKEXISTS)
97 __set_bit(AFS_VLDB_HAS_BAK, &entry->flags);
98
99 if (!(vlflags & (AFS_VLF_RWEXISTS | AFS_VLF_ROEXISTS | AFS_VLF_BACKEXISTS))) {
100 entry->error = -ENOMEDIUM;
101 __set_bit(AFS_VLDB_QUERY_ERROR, &entry->flags);
102 }
103
104 __set_bit(AFS_VLDB_QUERY_VALID, &entry->flags);
105 _leave(" = 0 [done]");
106 return 0;
107 }
108
afs_destroy_vl_get_entry_by_name_u(struct afs_call * call)109 static void afs_destroy_vl_get_entry_by_name_u(struct afs_call *call)
110 {
111 kfree(call->ret_vldb);
112 afs_flat_call_destructor(call);
113 }
114
115 /*
116 * VL.GetEntryByNameU operation type.
117 */
118 static const struct afs_call_type afs_RXVLGetEntryByNameU = {
119 .name = "VL.GetEntryByNameU",
120 .op = afs_VL_GetEntryByNameU,
121 .deliver = afs_deliver_vl_get_entry_by_name_u,
122 .destructor = afs_destroy_vl_get_entry_by_name_u,
123 };
124
125 /*
126 * Dispatch a get volume entry by name or ID operation (uuid variant). If the
127 * volname is a decimal number then it's a volume ID not a volume name.
128 */
afs_vl_get_entry_by_name_u(struct afs_vl_cursor * vc,const char * volname,int volnamesz)129 struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *vc,
130 const char *volname,
131 int volnamesz)
132 {
133 struct afs_vldb_entry *entry;
134 struct afs_call *call;
135 struct afs_net *net = vc->cell->net;
136 size_t reqsz, padsz;
137 __be32 *bp;
138
139 _enter("");
140
141 padsz = (4 - (volnamesz & 3)) & 3;
142 reqsz = 8 + volnamesz + padsz;
143
144 entry = kzalloc(sizeof(struct afs_vldb_entry), GFP_KERNEL);
145 if (!entry)
146 return ERR_PTR(-ENOMEM);
147
148 call = afs_alloc_flat_call(net, &afs_RXVLGetEntryByNameU, reqsz,
149 sizeof(struct afs_uvldbentry__xdr));
150 if (!call) {
151 kfree(entry);
152 return ERR_PTR(-ENOMEM);
153 }
154
155 call->key = vc->key;
156 call->ret_vldb = entry;
157 call->max_lifespan = AFS_VL_MAX_LIFESPAN;
158
159 /* Marshall the parameters */
160 bp = call->request;
161 *bp++ = htonl(VLGETENTRYBYNAMEU);
162 *bp++ = htonl(volnamesz);
163 memcpy(bp, volname, volnamesz);
164 if (padsz > 0)
165 memset((void *)bp + volnamesz, 0, padsz);
166
167 trace_afs_make_vl_call(call);
168 afs_make_call(&vc->ac, call, GFP_KERNEL);
169 return (struct afs_vldb_entry *)afs_wait_for_call_to_complete(call, &vc->ac);
170 }
171
172 /*
173 * Deliver reply data to a VL.GetAddrsU call.
174 *
175 * GetAddrsU(IN ListAddrByAttributes *inaddr,
176 * OUT afsUUID *uuidp1,
177 * OUT uint32_t *uniquifier,
178 * OUT uint32_t *nentries,
179 * OUT bulkaddrs *blkaddrs);
180 */
afs_deliver_vl_get_addrs_u(struct afs_call * call)181 static int afs_deliver_vl_get_addrs_u(struct afs_call *call)
182 {
183 struct afs_addr_list *alist;
184 __be32 *bp;
185 u32 uniquifier, nentries, count;
186 int i, ret;
187
188 _enter("{%u,%zu/%u}",
189 call->unmarshall, iov_iter_count(call->iter), call->count);
190
191 switch (call->unmarshall) {
192 case 0:
193 afs_extract_to_buf(call,
194 sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32));
195 call->unmarshall++;
196
197 /* Extract the returned uuid, uniquifier, nentries and
198 * blkaddrs size */
199 fallthrough;
200 case 1:
201 ret = afs_extract_data(call, true);
202 if (ret < 0)
203 return ret;
204
205 bp = call->buffer + sizeof(struct afs_uuid__xdr);
206 uniquifier = ntohl(*bp++);
207 nentries = ntohl(*bp++);
208 count = ntohl(*bp);
209
210 nentries = min(nentries, count);
211 alist = afs_alloc_addrlist(nentries, FS_SERVICE, AFS_FS_PORT);
212 if (!alist)
213 return -ENOMEM;
214 alist->version = uniquifier;
215 call->ret_alist = alist;
216 call->count = count;
217 call->count2 = nentries;
218 call->unmarshall++;
219
220 more_entries:
221 count = min(call->count, 4U);
222 afs_extract_to_buf(call, count * sizeof(__be32));
223
224 fallthrough; /* and extract entries */
225 case 2:
226 ret = afs_extract_data(call, call->count > 4);
227 if (ret < 0)
228 return ret;
229
230 alist = call->ret_alist;
231 bp = call->buffer;
232 count = min(call->count, 4U);
233 for (i = 0; i < count; i++)
234 if (alist->nr_addrs < call->count2)
235 afs_merge_fs_addr4(alist, *bp++, AFS_FS_PORT);
236
237 call->count -= count;
238 if (call->count > 0)
239 goto more_entries;
240 call->unmarshall++;
241 break;
242 }
243
244 _leave(" = 0 [done]");
245 return 0;
246 }
247
afs_vl_get_addrs_u_destructor(struct afs_call * call)248 static void afs_vl_get_addrs_u_destructor(struct afs_call *call)
249 {
250 afs_put_addrlist(call->ret_alist);
251 return afs_flat_call_destructor(call);
252 }
253
254 /*
255 * VL.GetAddrsU operation type.
256 */
257 static const struct afs_call_type afs_RXVLGetAddrsU = {
258 .name = "VL.GetAddrsU",
259 .op = afs_VL_GetAddrsU,
260 .deliver = afs_deliver_vl_get_addrs_u,
261 .destructor = afs_vl_get_addrs_u_destructor,
262 };
263
264 /*
265 * Dispatch an operation to get the addresses for a server, where the server is
266 * nominated by UUID.
267 */
afs_vl_get_addrs_u(struct afs_vl_cursor * vc,const uuid_t * uuid)268 struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *vc,
269 const uuid_t *uuid)
270 {
271 struct afs_ListAddrByAttributes__xdr *r;
272 const struct afs_uuid *u = (const struct afs_uuid *)uuid;
273 struct afs_call *call;
274 struct afs_net *net = vc->cell->net;
275 __be32 *bp;
276 int i;
277
278 _enter("");
279
280 call = afs_alloc_flat_call(net, &afs_RXVLGetAddrsU,
281 sizeof(__be32) + sizeof(struct afs_ListAddrByAttributes__xdr),
282 sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32));
283 if (!call)
284 return ERR_PTR(-ENOMEM);
285
286 call->key = vc->key;
287 call->ret_alist = NULL;
288 call->max_lifespan = AFS_VL_MAX_LIFESPAN;
289
290 /* Marshall the parameters */
291 bp = call->request;
292 *bp++ = htonl(VLGETADDRSU);
293 r = (struct afs_ListAddrByAttributes__xdr *)bp;
294 r->Mask = htonl(AFS_VLADDR_UUID);
295 r->ipaddr = 0;
296 r->index = 0;
297 r->spare = 0;
298 r->uuid.time_low = u->time_low;
299 r->uuid.time_mid = htonl(ntohs(u->time_mid));
300 r->uuid.time_hi_and_version = htonl(ntohs(u->time_hi_and_version));
301 r->uuid.clock_seq_hi_and_reserved = htonl(u->clock_seq_hi_and_reserved);
302 r->uuid.clock_seq_low = htonl(u->clock_seq_low);
303 for (i = 0; i < 6; i++)
304 r->uuid.node[i] = htonl(u->node[i]);
305
306 trace_afs_make_vl_call(call);
307 afs_make_call(&vc->ac, call, GFP_KERNEL);
308 return (struct afs_addr_list *)afs_wait_for_call_to_complete(call, &vc->ac);
309 }
310
311 /*
312 * Deliver reply data to an VL.GetCapabilities operation.
313 */
afs_deliver_vl_get_capabilities(struct afs_call * call)314 static int afs_deliver_vl_get_capabilities(struct afs_call *call)
315 {
316 u32 count;
317 int ret;
318
319 _enter("{%u,%zu/%u}",
320 call->unmarshall, iov_iter_count(call->iter), call->count);
321
322 switch (call->unmarshall) {
323 case 0:
324 afs_extract_to_tmp(call);
325 call->unmarshall++;
326
327 fallthrough; /* and extract the capabilities word count */
328 case 1:
329 ret = afs_extract_data(call, true);
330 if (ret < 0)
331 return ret;
332
333 count = ntohl(call->tmp);
334 call->count = count;
335 call->count2 = count;
336
337 call->unmarshall++;
338 afs_extract_discard(call, count * sizeof(__be32));
339
340 fallthrough; /* and extract capabilities words */
341 case 2:
342 ret = afs_extract_data(call, false);
343 if (ret < 0)
344 return ret;
345
346 /* TODO: Examine capabilities */
347
348 call->unmarshall++;
349 break;
350 }
351
352 _leave(" = 0 [done]");
353 return 0;
354 }
355
afs_destroy_vl_get_capabilities(struct afs_call * call)356 static void afs_destroy_vl_get_capabilities(struct afs_call *call)
357 {
358 afs_put_vlserver(call->net, call->vlserver);
359 afs_flat_call_destructor(call);
360 }
361
362 /*
363 * VL.GetCapabilities operation type
364 */
365 static const struct afs_call_type afs_RXVLGetCapabilities = {
366 .name = "VL.GetCapabilities",
367 .op = afs_VL_GetCapabilities,
368 .deliver = afs_deliver_vl_get_capabilities,
369 .done = afs_vlserver_probe_result,
370 .destructor = afs_destroy_vl_get_capabilities,
371 };
372
373 /*
374 * Probe a volume server for the capabilities that it supports. This can
375 * return up to 196 words.
376 *
377 * We use this to probe for service upgrade to determine what the server at the
378 * other end supports.
379 */
afs_vl_get_capabilities(struct afs_net * net,struct afs_addr_cursor * ac,struct key * key,struct afs_vlserver * server,unsigned int server_index)380 struct afs_call *afs_vl_get_capabilities(struct afs_net *net,
381 struct afs_addr_cursor *ac,
382 struct key *key,
383 struct afs_vlserver *server,
384 unsigned int server_index)
385 {
386 struct afs_call *call;
387 __be32 *bp;
388
389 _enter("");
390
391 call = afs_alloc_flat_call(net, &afs_RXVLGetCapabilities, 1 * 4, 16 * 4);
392 if (!call)
393 return ERR_PTR(-ENOMEM);
394
395 call->key = key;
396 call->vlserver = afs_get_vlserver(server);
397 call->server_index = server_index;
398 call->upgrade = true;
399 call->async = true;
400 call->max_lifespan = AFS_PROBE_MAX_LIFESPAN;
401
402 /* marshall the parameters */
403 bp = call->request;
404 *bp++ = htonl(VLGETCAPABILITIES);
405
406 /* Can't take a ref on server */
407 trace_afs_make_vl_call(call);
408 afs_make_call(ac, call, GFP_KERNEL);
409 return call;
410 }
411
412 /*
413 * Deliver reply data to a YFSVL.GetEndpoints call.
414 *
415 * GetEndpoints(IN yfsServerAttributes *attr,
416 * OUT opr_uuid *uuid,
417 * OUT afs_int32 *uniquifier,
418 * OUT endpoints *fsEndpoints,
419 * OUT endpoints *volEndpoints)
420 */
afs_deliver_yfsvl_get_endpoints(struct afs_call * call)421 static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
422 {
423 struct afs_addr_list *alist;
424 __be32 *bp;
425 u32 uniquifier, size;
426 int ret;
427
428 _enter("{%u,%zu,%u}",
429 call->unmarshall, iov_iter_count(call->iter), call->count2);
430
431 switch (call->unmarshall) {
432 case 0:
433 afs_extract_to_buf(call, sizeof(uuid_t) + 3 * sizeof(__be32));
434 call->unmarshall = 1;
435
436 /* Extract the returned uuid, uniquifier, fsEndpoints count and
437 * either the first fsEndpoint type or the volEndpoints
438 * count if there are no fsEndpoints. */
439 fallthrough;
440 case 1:
441 ret = afs_extract_data(call, true);
442 if (ret < 0)
443 return ret;
444
445 bp = call->buffer + sizeof(uuid_t);
446 uniquifier = ntohl(*bp++);
447 call->count = ntohl(*bp++);
448 call->count2 = ntohl(*bp); /* Type or next count */
449
450 if (call->count > YFS_MAXENDPOINTS)
451 return afs_protocol_error(call, afs_eproto_yvl_fsendpt_num);
452
453 alist = afs_alloc_addrlist(call->count, FS_SERVICE, AFS_FS_PORT);
454 if (!alist)
455 return -ENOMEM;
456 alist->version = uniquifier;
457 call->ret_alist = alist;
458
459 if (call->count == 0)
460 goto extract_volendpoints;
461
462 next_fsendpoint:
463 switch (call->count2) {
464 case YFS_ENDPOINT_IPV4:
465 size = sizeof(__be32) * (1 + 1 + 1);
466 break;
467 case YFS_ENDPOINT_IPV6:
468 size = sizeof(__be32) * (1 + 4 + 1);
469 break;
470 default:
471 return afs_protocol_error(call, afs_eproto_yvl_fsendpt_type);
472 }
473
474 size += sizeof(__be32);
475 afs_extract_to_buf(call, size);
476 call->unmarshall = 2;
477
478 fallthrough; /* and extract fsEndpoints[] entries */
479 case 2:
480 ret = afs_extract_data(call, true);
481 if (ret < 0)
482 return ret;
483
484 alist = call->ret_alist;
485 bp = call->buffer;
486 switch (call->count2) {
487 case YFS_ENDPOINT_IPV4:
488 if (ntohl(bp[0]) != sizeof(__be32) * 2)
489 return afs_protocol_error(
490 call, afs_eproto_yvl_fsendpt4_len);
491 afs_merge_fs_addr4(alist, bp[1], ntohl(bp[2]));
492 bp += 3;
493 break;
494 case YFS_ENDPOINT_IPV6:
495 if (ntohl(bp[0]) != sizeof(__be32) * 5)
496 return afs_protocol_error(
497 call, afs_eproto_yvl_fsendpt6_len);
498 afs_merge_fs_addr6(alist, bp + 1, ntohl(bp[5]));
499 bp += 6;
500 break;
501 default:
502 return afs_protocol_error(call, afs_eproto_yvl_fsendpt_type);
503 }
504
505 /* Got either the type of the next entry or the count of
506 * volEndpoints if no more fsEndpoints.
507 */
508 call->count2 = ntohl(*bp++);
509
510 call->count--;
511 if (call->count > 0)
512 goto next_fsendpoint;
513
514 extract_volendpoints:
515 /* Extract the list of volEndpoints. */
516 call->count = call->count2;
517 if (!call->count)
518 goto end;
519 if (call->count > YFS_MAXENDPOINTS)
520 return afs_protocol_error(call, afs_eproto_yvl_vlendpt_type);
521
522 afs_extract_to_buf(call, 1 * sizeof(__be32));
523 call->unmarshall = 3;
524
525 /* Extract the type of volEndpoints[0]. Normally we would
526 * extract the type of the next endpoint when we extract the
527 * data of the current one, but this is the first...
528 */
529 fallthrough;
530 case 3:
531 ret = afs_extract_data(call, true);
532 if (ret < 0)
533 return ret;
534
535 bp = call->buffer;
536
537 next_volendpoint:
538 call->count2 = ntohl(*bp++);
539 switch (call->count2) {
540 case YFS_ENDPOINT_IPV4:
541 size = sizeof(__be32) * (1 + 1 + 1);
542 break;
543 case YFS_ENDPOINT_IPV6:
544 size = sizeof(__be32) * (1 + 4 + 1);
545 break;
546 default:
547 return afs_protocol_error(call, afs_eproto_yvl_vlendpt_type);
548 }
549
550 if (call->count > 1)
551 size += sizeof(__be32); /* Get next type too */
552 afs_extract_to_buf(call, size);
553 call->unmarshall = 4;
554
555 fallthrough; /* and extract volEndpoints[] entries */
556 case 4:
557 ret = afs_extract_data(call, true);
558 if (ret < 0)
559 return ret;
560
561 bp = call->buffer;
562 switch (call->count2) {
563 case YFS_ENDPOINT_IPV4:
564 if (ntohl(bp[0]) != sizeof(__be32) * 2)
565 return afs_protocol_error(
566 call, afs_eproto_yvl_vlendpt4_len);
567 bp += 3;
568 break;
569 case YFS_ENDPOINT_IPV6:
570 if (ntohl(bp[0]) != sizeof(__be32) * 5)
571 return afs_protocol_error(
572 call, afs_eproto_yvl_vlendpt6_len);
573 bp += 6;
574 break;
575 default:
576 return afs_protocol_error(call, afs_eproto_yvl_vlendpt_type);
577 }
578
579 /* Got either the type of the next entry or the count of
580 * volEndpoints if no more fsEndpoints.
581 */
582 call->count--;
583 if (call->count > 0)
584 goto next_volendpoint;
585
586 end:
587 afs_extract_discard(call, 0);
588 call->unmarshall = 5;
589
590 fallthrough; /* Done */
591 case 5:
592 ret = afs_extract_data(call, false);
593 if (ret < 0)
594 return ret;
595 call->unmarshall = 6;
596
597 case 6:
598 break;
599 }
600
601 _leave(" = 0 [done]");
602 return 0;
603 }
604
605 /*
606 * YFSVL.GetEndpoints operation type.
607 */
608 static const struct afs_call_type afs_YFSVLGetEndpoints = {
609 .name = "YFSVL.GetEndpoints",
610 .op = afs_YFSVL_GetEndpoints,
611 .deliver = afs_deliver_yfsvl_get_endpoints,
612 .destructor = afs_vl_get_addrs_u_destructor,
613 };
614
615 /*
616 * Dispatch an operation to get the addresses for a server, where the server is
617 * nominated by UUID.
618 */
afs_yfsvl_get_endpoints(struct afs_vl_cursor * vc,const uuid_t * uuid)619 struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *vc,
620 const uuid_t *uuid)
621 {
622 struct afs_call *call;
623 struct afs_net *net = vc->cell->net;
624 __be32 *bp;
625
626 _enter("");
627
628 call = afs_alloc_flat_call(net, &afs_YFSVLGetEndpoints,
629 sizeof(__be32) * 2 + sizeof(*uuid),
630 sizeof(struct in6_addr) + sizeof(__be32) * 3);
631 if (!call)
632 return ERR_PTR(-ENOMEM);
633
634 call->key = vc->key;
635 call->ret_alist = NULL;
636 call->max_lifespan = AFS_VL_MAX_LIFESPAN;
637
638 /* Marshall the parameters */
639 bp = call->request;
640 *bp++ = htonl(YVLGETENDPOINTS);
641 *bp++ = htonl(YFS_SERVER_UUID);
642 memcpy(bp, uuid, sizeof(*uuid)); /* Type opr_uuid */
643
644 trace_afs_make_vl_call(call);
645 afs_make_call(&vc->ac, call, GFP_KERNEL);
646 return (struct afs_addr_list *)afs_wait_for_call_to_complete(call, &vc->ac);
647 }
648
649 /*
650 * Deliver reply data to a YFSVL.GetCellName operation.
651 */
afs_deliver_yfsvl_get_cell_name(struct afs_call * call)652 static int afs_deliver_yfsvl_get_cell_name(struct afs_call *call)
653 {
654 char *cell_name;
655 u32 namesz, paddedsz;
656 int ret;
657
658 _enter("{%u,%zu/%u}",
659 call->unmarshall, iov_iter_count(call->iter), call->count);
660
661 switch (call->unmarshall) {
662 case 0:
663 afs_extract_to_tmp(call);
664 call->unmarshall++;
665
666 fallthrough; /* and extract the cell name length */
667 case 1:
668 ret = afs_extract_data(call, true);
669 if (ret < 0)
670 return ret;
671
672 namesz = ntohl(call->tmp);
673 if (namesz > AFS_MAXCELLNAME)
674 return afs_protocol_error(call, afs_eproto_cellname_len);
675 paddedsz = (namesz + 3) & ~3;
676 call->count = namesz;
677 call->count2 = paddedsz - namesz;
678
679 cell_name = kmalloc(namesz + 1, GFP_KERNEL);
680 if (!cell_name)
681 return -ENOMEM;
682 cell_name[namesz] = 0;
683 call->ret_str = cell_name;
684
685 afs_extract_begin(call, cell_name, namesz);
686 call->unmarshall++;
687
688 fallthrough; /* and extract cell name */
689 case 2:
690 ret = afs_extract_data(call, true);
691 if (ret < 0)
692 return ret;
693
694 afs_extract_discard(call, call->count2);
695 call->unmarshall++;
696
697 fallthrough; /* and extract padding */
698 case 3:
699 ret = afs_extract_data(call, false);
700 if (ret < 0)
701 return ret;
702
703 call->unmarshall++;
704 break;
705 }
706
707 _leave(" = 0 [done]");
708 return 0;
709 }
710
afs_destroy_yfsvl_get_cell_name(struct afs_call * call)711 static void afs_destroy_yfsvl_get_cell_name(struct afs_call *call)
712 {
713 kfree(call->ret_str);
714 afs_flat_call_destructor(call);
715 }
716
717 /*
718 * VL.GetCapabilities operation type
719 */
720 static const struct afs_call_type afs_YFSVLGetCellName = {
721 .name = "YFSVL.GetCellName",
722 .op = afs_YFSVL_GetCellName,
723 .deliver = afs_deliver_yfsvl_get_cell_name,
724 .destructor = afs_destroy_yfsvl_get_cell_name,
725 };
726
727 /*
728 * Probe a volume server for the capabilities that it supports. This can
729 * return up to 196 words.
730 *
731 * We use this to probe for service upgrade to determine what the server at the
732 * other end supports.
733 */
afs_yfsvl_get_cell_name(struct afs_vl_cursor * vc)734 char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *vc)
735 {
736 struct afs_call *call;
737 struct afs_net *net = vc->cell->net;
738 __be32 *bp;
739
740 _enter("");
741
742 call = afs_alloc_flat_call(net, &afs_YFSVLGetCellName, 1 * 4, 0);
743 if (!call)
744 return ERR_PTR(-ENOMEM);
745
746 call->key = vc->key;
747 call->ret_str = NULL;
748 call->max_lifespan = AFS_VL_MAX_LIFESPAN;
749
750 /* marshall the parameters */
751 bp = call->request;
752 *bp++ = htonl(YVLGETCELLNAME);
753
754 /* Can't take a ref on server */
755 trace_afs_make_vl_call(call);
756 afs_make_call(&vc->ac, call, GFP_KERNEL);
757 return (char *)afs_wait_for_call_to_complete(call, &vc->ac);
758 }
759
