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TOMOYO Linux Cross Reference
Linux/fs/nfs/callback_xdr.c

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  1 /*
  2  * linux/fs/nfs/callback_xdr.c
  3  *
  4  * Copyright (C) 2004 Trond Myklebust
  5  *
  6  * NFSv4 callback encode/decode procedures
  7  */
  8 #include <linux/kernel.h>
  9 #include <linux/sunrpc/svc.h>
 10 #include <linux/nfs4.h>
 11 #include <linux/nfs_fs.h>
 12 #include <linux/ratelimit.h>
 13 #include <linux/printk.h>
 14 #include <linux/slab.h>
 15 #include <linux/sunrpc/bc_xprt.h>
 16 #include "nfs4_fs.h"
 17 #include "callback.h"
 18 #include "internal.h"
 19 #include "nfs4session.h"
 20 
 21 #define CB_OP_TAGLEN_MAXSZ      (512)
 22 #define CB_OP_HDR_RES_MAXSZ     (2 + CB_OP_TAGLEN_MAXSZ)
 23 #define CB_OP_GETATTR_BITMAP_MAXSZ      (4)
 24 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
 25                                 CB_OP_GETATTR_BITMAP_MAXSZ + \
 26                                 2 + 2 + 3 + 3)
 27 #define CB_OP_RECALL_RES_MAXSZ  (CB_OP_HDR_RES_MAXSZ)
 28 
 29 #if defined(CONFIG_NFS_V4_1)
 30 #define CB_OP_LAYOUTRECALL_RES_MAXSZ    (CB_OP_HDR_RES_MAXSZ)
 31 #define CB_OP_DEVICENOTIFY_RES_MAXSZ    (CB_OP_HDR_RES_MAXSZ)
 32 #define CB_OP_SEQUENCE_RES_MAXSZ        (CB_OP_HDR_RES_MAXSZ + \
 33                                         4 + 1 + 3)
 34 #define CB_OP_RECALLANY_RES_MAXSZ       (CB_OP_HDR_RES_MAXSZ)
 35 #define CB_OP_RECALLSLOT_RES_MAXSZ      (CB_OP_HDR_RES_MAXSZ)
 36 #endif /* CONFIG_NFS_V4_1 */
 37 
 38 #define NFSDBG_FACILITY NFSDBG_CALLBACK
 39 
 40 /* Internal error code */
 41 #define NFS4ERR_RESOURCE_HDR    11050
 42 
 43 typedef __be32 (*callback_process_op_t)(void *, void *,
 44                                         struct cb_process_state *);
 45 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
 46 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
 47 
 48 
 49 struct callback_op {
 50         callback_process_op_t process_op;
 51         callback_decode_arg_t decode_args;
 52         callback_encode_res_t encode_res;
 53         long res_maxsize;
 54 };
 55 
 56 static struct callback_op callback_ops[];
 57 
 58 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
 59 {
 60         return htonl(NFS4_OK);
 61 }
 62 
 63 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 64 {
 65         return xdr_argsize_check(rqstp, p);
 66 }
 67 
 68 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 69 {
 70         return xdr_ressize_check(rqstp, p);
 71 }
 72 
 73 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
 74 {
 75         __be32 *p;
 76 
 77         p = xdr_inline_decode(xdr, nbytes);
 78         if (unlikely(p == NULL))
 79                 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
 80         return p;
 81 }
 82 
 83 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
 84 {
 85         __be32 *p;
 86 
 87         p = read_buf(xdr, 4);
 88         if (unlikely(p == NULL))
 89                 return htonl(NFS4ERR_RESOURCE);
 90         *len = ntohl(*p);
 91 
 92         if (*len != 0) {
 93                 p = read_buf(xdr, *len);
 94                 if (unlikely(p == NULL))
 95                         return htonl(NFS4ERR_RESOURCE);
 96                 *str = (const char *)p;
 97         } else
 98                 *str = NULL;
 99 
100         return 0;
101 }
102 
103 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
104 {
105         __be32 *p;
106 
107         p = read_buf(xdr, 4);
108         if (unlikely(p == NULL))
109                 return htonl(NFS4ERR_RESOURCE);
110         fh->size = ntohl(*p);
111         if (fh->size > NFS4_FHSIZE)
112                 return htonl(NFS4ERR_BADHANDLE);
113         p = read_buf(xdr, fh->size);
114         if (unlikely(p == NULL))
115                 return htonl(NFS4ERR_RESOURCE);
116         memcpy(&fh->data[0], p, fh->size);
117         memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
118         return 0;
119 }
120 
121 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
122 {
123         __be32 *p;
124         unsigned int attrlen;
125 
126         p = read_buf(xdr, 4);
127         if (unlikely(p == NULL))
128                 return htonl(NFS4ERR_RESOURCE);
129         attrlen = ntohl(*p);
130         p = read_buf(xdr, attrlen << 2);
131         if (unlikely(p == NULL))
132                 return htonl(NFS4ERR_RESOURCE);
133         if (likely(attrlen > 0))
134                 bitmap[0] = ntohl(*p++);
135         if (attrlen > 1)
136                 bitmap[1] = ntohl(*p);
137         return 0;
138 }
139 
140 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
141 {
142         __be32 *p;
143 
144         p = read_buf(xdr, NFS4_STATEID_SIZE);
145         if (unlikely(p == NULL))
146                 return htonl(NFS4ERR_RESOURCE);
147         memcpy(stateid, p, NFS4_STATEID_SIZE);
148         return 0;
149 }
150 
151 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
152 {
153         __be32 *p;
154         __be32 status;
155 
156         status = decode_string(xdr, &hdr->taglen, &hdr->tag);
157         if (unlikely(status != 0))
158                 return status;
159         /* We do not like overly long tags! */
160         if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
161                 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
162                                 __func__, hdr->taglen);
163                 return htonl(NFS4ERR_RESOURCE);
164         }
165         p = read_buf(xdr, 12);
166         if (unlikely(p == NULL))
167                 return htonl(NFS4ERR_RESOURCE);
168         hdr->minorversion = ntohl(*p++);
169         /* Check for minor version support */
170         if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
171                 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
172         } else {
173                 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
174                         "illegal minor version %u!\n",
175                         __func__, hdr->minorversion);
176                 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
177         }
178         hdr->nops = ntohl(*p);
179         dprintk("%s: minorversion %d nops %d\n", __func__,
180                 hdr->minorversion, hdr->nops);
181         return 0;
182 }
183 
184 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
185 {
186         __be32 *p;
187         p = read_buf(xdr, 4);
188         if (unlikely(p == NULL))
189                 return htonl(NFS4ERR_RESOURCE_HDR);
190         *op = ntohl(*p);
191         return 0;
192 }
193 
194 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
195 {
196         __be32 status;
197 
198         status = decode_fh(xdr, &args->fh);
199         if (unlikely(status != 0))
200                 goto out;
201         args->addr = svc_addr(rqstp);
202         status = decode_bitmap(xdr, args->bitmap);
203 out:
204         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
205         return status;
206 }
207 
208 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
209 {
210         __be32 *p;
211         __be32 status;
212 
213         args->addr = svc_addr(rqstp);
214         status = decode_stateid(xdr, &args->stateid);
215         if (unlikely(status != 0))
216                 goto out;
217         p = read_buf(xdr, 4);
218         if (unlikely(p == NULL)) {
219                 status = htonl(NFS4ERR_RESOURCE);
220                 goto out;
221         }
222         args->truncate = ntohl(*p);
223         status = decode_fh(xdr, &args->fh);
224 out:
225         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
226         return status;
227 }
228 
229 #if defined(CONFIG_NFS_V4_1)
230 
231 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
232                                        struct xdr_stream *xdr,
233                                        struct cb_layoutrecallargs *args)
234 {
235         __be32 *p;
236         __be32 status = 0;
237         uint32_t iomode;
238 
239         args->cbl_addr = svc_addr(rqstp);
240         p = read_buf(xdr, 4 * sizeof(uint32_t));
241         if (unlikely(p == NULL)) {
242                 status = htonl(NFS4ERR_BADXDR);
243                 goto out;
244         }
245 
246         args->cbl_layout_type = ntohl(*p++);
247         /* Depite the spec's xdr, iomode really belongs in the FILE switch,
248          * as it is unusable and ignored with the other types.
249          */
250         iomode = ntohl(*p++);
251         args->cbl_layoutchanged = ntohl(*p++);
252         args->cbl_recall_type = ntohl(*p++);
253 
254         if (args->cbl_recall_type == RETURN_FILE) {
255                 args->cbl_range.iomode = iomode;
256                 status = decode_fh(xdr, &args->cbl_fh);
257                 if (unlikely(status != 0))
258                         goto out;
259 
260                 p = read_buf(xdr, 2 * sizeof(uint64_t));
261                 if (unlikely(p == NULL)) {
262                         status = htonl(NFS4ERR_BADXDR);
263                         goto out;
264                 }
265                 p = xdr_decode_hyper(p, &args->cbl_range.offset);
266                 p = xdr_decode_hyper(p, &args->cbl_range.length);
267                 status = decode_stateid(xdr, &args->cbl_stateid);
268                 if (unlikely(status != 0))
269                         goto out;
270         } else if (args->cbl_recall_type == RETURN_FSID) {
271                 p = read_buf(xdr, 2 * sizeof(uint64_t));
272                 if (unlikely(p == NULL)) {
273                         status = htonl(NFS4ERR_BADXDR);
274                         goto out;
275                 }
276                 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
277                 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
278         } else if (args->cbl_recall_type != RETURN_ALL) {
279                 status = htonl(NFS4ERR_BADXDR);
280                 goto out;
281         }
282         dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
283                 __func__,
284                 args->cbl_layout_type, iomode,
285                 args->cbl_layoutchanged, args->cbl_recall_type);
286 out:
287         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
288         return status;
289 }
290 
291 static
292 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
293                                 struct xdr_stream *xdr,
294                                 struct cb_devicenotifyargs *args)
295 {
296         __be32 *p;
297         __be32 status = 0;
298         u32 tmp;
299         int n, i;
300         args->ndevs = 0;
301 
302         /* Num of device notifications */
303         p = read_buf(xdr, sizeof(uint32_t));
304         if (unlikely(p == NULL)) {
305                 status = htonl(NFS4ERR_BADXDR);
306                 goto out;
307         }
308         n = ntohl(*p++);
309         if (n <= 0)
310                 goto out;
311         if (n > ULONG_MAX / sizeof(*args->devs)) {
312                 status = htonl(NFS4ERR_BADXDR);
313                 goto out;
314         }
315 
316         args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
317         if (!args->devs) {
318                 status = htonl(NFS4ERR_DELAY);
319                 goto out;
320         }
321 
322         /* Decode each dev notification */
323         for (i = 0; i < n; i++) {
324                 struct cb_devicenotifyitem *dev = &args->devs[i];
325 
326                 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
327                 if (unlikely(p == NULL)) {
328                         status = htonl(NFS4ERR_BADXDR);
329                         goto err;
330                 }
331 
332                 tmp = ntohl(*p++);      /* bitmap size */
333                 if (tmp != 1) {
334                         status = htonl(NFS4ERR_INVAL);
335                         goto err;
336                 }
337                 dev->cbd_notify_type = ntohl(*p++);
338                 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
339                     dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
340                         status = htonl(NFS4ERR_INVAL);
341                         goto err;
342                 }
343 
344                 tmp = ntohl(*p++);      /* opaque size */
345                 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
346                      (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
347                     ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
348                      (tmp != NFS4_DEVICEID4_SIZE + 4))) {
349                         status = htonl(NFS4ERR_INVAL);
350                         goto err;
351                 }
352                 dev->cbd_layout_type = ntohl(*p++);
353                 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
354                 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
355 
356                 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
357                         p = read_buf(xdr, sizeof(uint32_t));
358                         if (unlikely(p == NULL)) {
359                                 status = htonl(NFS4ERR_BADXDR);
360                                 goto err;
361                         }
362                         dev->cbd_immediate = ntohl(*p++);
363                 } else {
364                         dev->cbd_immediate = 0;
365                 }
366 
367                 args->ndevs++;
368 
369                 dprintk("%s: type %d layout 0x%x immediate %d\n",
370                         __func__, dev->cbd_notify_type, dev->cbd_layout_type,
371                         dev->cbd_immediate);
372         }
373 out:
374         dprintk("%s: status %d ndevs %d\n",
375                 __func__, ntohl(status), args->ndevs);
376         return status;
377 err:
378         kfree(args->devs);
379         goto out;
380 }
381 
382 static __be32 decode_sessionid(struct xdr_stream *xdr,
383                                  struct nfs4_sessionid *sid)
384 {
385         __be32 *p;
386         int len = NFS4_MAX_SESSIONID_LEN;
387 
388         p = read_buf(xdr, len);
389         if (unlikely(p == NULL))
390                 return htonl(NFS4ERR_RESOURCE);
391 
392         memcpy(sid->data, p, len);
393         return 0;
394 }
395 
396 static __be32 decode_rc_list(struct xdr_stream *xdr,
397                                struct referring_call_list *rc_list)
398 {
399         __be32 *p;
400         int i;
401         __be32 status;
402 
403         status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
404         if (status)
405                 goto out;
406 
407         status = htonl(NFS4ERR_RESOURCE);
408         p = read_buf(xdr, sizeof(uint32_t));
409         if (unlikely(p == NULL))
410                 goto out;
411 
412         rc_list->rcl_nrefcalls = ntohl(*p++);
413         if (rc_list->rcl_nrefcalls) {
414                 p = read_buf(xdr,
415                              rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
416                 if (unlikely(p == NULL))
417                         goto out;
418                 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
419                                                 sizeof(*rc_list->rcl_refcalls),
420                                                 GFP_KERNEL);
421                 if (unlikely(rc_list->rcl_refcalls == NULL))
422                         goto out;
423                 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
424                         rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
425                         rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
426                 }
427         }
428         status = 0;
429 
430 out:
431         return status;
432 }
433 
434 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
435                                         struct xdr_stream *xdr,
436                                         struct cb_sequenceargs *args)
437 {
438         __be32 *p;
439         int i;
440         __be32 status;
441 
442         status = decode_sessionid(xdr, &args->csa_sessionid);
443         if (status)
444                 goto out;
445 
446         status = htonl(NFS4ERR_RESOURCE);
447         p = read_buf(xdr, 5 * sizeof(uint32_t));
448         if (unlikely(p == NULL))
449                 goto out;
450 
451         args->csa_addr = svc_addr(rqstp);
452         args->csa_sequenceid = ntohl(*p++);
453         args->csa_slotid = ntohl(*p++);
454         args->csa_highestslotid = ntohl(*p++);
455         args->csa_cachethis = ntohl(*p++);
456         args->csa_nrclists = ntohl(*p++);
457         args->csa_rclists = NULL;
458         if (args->csa_nrclists) {
459                 args->csa_rclists = kmalloc_array(args->csa_nrclists,
460                                                   sizeof(*args->csa_rclists),
461                                                   GFP_KERNEL);
462                 if (unlikely(args->csa_rclists == NULL))
463                         goto out;
464 
465                 for (i = 0; i < args->csa_nrclists; i++) {
466                         status = decode_rc_list(xdr, &args->csa_rclists[i]);
467                         if (status) {
468                                 args->csa_nrclists = i;
469                                 goto out_free;
470                         }
471                 }
472         }
473         status = 0;
474 
475         dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
476                 "highestslotid %u cachethis %d nrclists %u\n",
477                 __func__,
478                 ((u32 *)&args->csa_sessionid)[0],
479                 ((u32 *)&args->csa_sessionid)[1],
480                 ((u32 *)&args->csa_sessionid)[2],
481                 ((u32 *)&args->csa_sessionid)[3],
482                 args->csa_sequenceid, args->csa_slotid,
483                 args->csa_highestslotid, args->csa_cachethis,
484                 args->csa_nrclists);
485 out:
486         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
487         return status;
488 
489 out_free:
490         for (i = 0; i < args->csa_nrclists; i++)
491                 kfree(args->csa_rclists[i].rcl_refcalls);
492         kfree(args->csa_rclists);
493         goto out;
494 }
495 
496 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
497                                       struct xdr_stream *xdr,
498                                       struct cb_recallanyargs *args)
499 {
500         uint32_t bitmap[2];
501         __be32 *p, status;
502 
503         args->craa_addr = svc_addr(rqstp);
504         p = read_buf(xdr, 4);
505         if (unlikely(p == NULL))
506                 return htonl(NFS4ERR_BADXDR);
507         args->craa_objs_to_keep = ntohl(*p++);
508         status = decode_bitmap(xdr, bitmap);
509         if (unlikely(status))
510                 return status;
511         args->craa_type_mask = bitmap[0];
512 
513         return 0;
514 }
515 
516 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
517                                         struct xdr_stream *xdr,
518                                         struct cb_recallslotargs *args)
519 {
520         __be32 *p;
521 
522         args->crsa_addr = svc_addr(rqstp);
523         p = read_buf(xdr, 4);
524         if (unlikely(p == NULL))
525                 return htonl(NFS4ERR_BADXDR);
526         args->crsa_target_highest_slotid = ntohl(*p++);
527         return 0;
528 }
529 
530 #endif /* CONFIG_NFS_V4_1 */
531 
532 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
533 {
534         __be32 *p;
535 
536         p = xdr_reserve_space(xdr, 4 + len);
537         if (unlikely(p == NULL))
538                 return htonl(NFS4ERR_RESOURCE);
539         xdr_encode_opaque(p, str, len);
540         return 0;
541 }
542 
543 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
544 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
545 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
546 {
547         __be32 bm[2];
548         __be32 *p;
549 
550         bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
551         bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
552         if (bm[1] != 0) {
553                 p = xdr_reserve_space(xdr, 16);
554                 if (unlikely(p == NULL))
555                         return htonl(NFS4ERR_RESOURCE);
556                 *p++ = htonl(2);
557                 *p++ = bm[0];
558                 *p++ = bm[1];
559         } else if (bm[0] != 0) {
560                 p = xdr_reserve_space(xdr, 12);
561                 if (unlikely(p == NULL))
562                         return htonl(NFS4ERR_RESOURCE);
563                 *p++ = htonl(1);
564                 *p++ = bm[0];
565         } else {
566                 p = xdr_reserve_space(xdr, 8);
567                 if (unlikely(p == NULL))
568                         return htonl(NFS4ERR_RESOURCE);
569                 *p++ = htonl(0);
570         }
571         *savep = p;
572         return 0;
573 }
574 
575 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
576 {
577         __be32 *p;
578 
579         if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
580                 return 0;
581         p = xdr_reserve_space(xdr, 8);
582         if (unlikely(!p))
583                 return htonl(NFS4ERR_RESOURCE);
584         p = xdr_encode_hyper(p, change);
585         return 0;
586 }
587 
588 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
589 {
590         __be32 *p;
591 
592         if (!(bitmap[0] & FATTR4_WORD0_SIZE))
593                 return 0;
594         p = xdr_reserve_space(xdr, 8);
595         if (unlikely(!p))
596                 return htonl(NFS4ERR_RESOURCE);
597         p = xdr_encode_hyper(p, size);
598         return 0;
599 }
600 
601 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
602 {
603         __be32 *p;
604 
605         p = xdr_reserve_space(xdr, 12);
606         if (unlikely(!p))
607                 return htonl(NFS4ERR_RESOURCE);
608         p = xdr_encode_hyper(p, time->tv_sec);
609         *p = htonl(time->tv_nsec);
610         return 0;
611 }
612 
613 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
614 {
615         if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
616                 return 0;
617         return encode_attr_time(xdr,time);
618 }
619 
620 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
621 {
622         if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
623                 return 0;
624         return encode_attr_time(xdr,time);
625 }
626 
627 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
628 {
629         __be32 status;
630 
631         hdr->status = xdr_reserve_space(xdr, 4);
632         if (unlikely(hdr->status == NULL))
633                 return htonl(NFS4ERR_RESOURCE);
634         status = encode_string(xdr, hdr->taglen, hdr->tag);
635         if (unlikely(status != 0))
636                 return status;
637         hdr->nops = xdr_reserve_space(xdr, 4);
638         if (unlikely(hdr->nops == NULL))
639                 return htonl(NFS4ERR_RESOURCE);
640         return 0;
641 }
642 
643 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
644 {
645         __be32 *p;
646         
647         p = xdr_reserve_space(xdr, 8);
648         if (unlikely(p == NULL))
649                 return htonl(NFS4ERR_RESOURCE_HDR);
650         *p++ = htonl(op);
651         *p = res;
652         return 0;
653 }
654 
655 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
656 {
657         __be32 *savep = NULL;
658         __be32 status = res->status;
659         
660         if (unlikely(status != 0))
661                 goto out;
662         status = encode_attr_bitmap(xdr, res->bitmap, &savep);
663         if (unlikely(status != 0))
664                 goto out;
665         status = encode_attr_change(xdr, res->bitmap, res->change_attr);
666         if (unlikely(status != 0))
667                 goto out;
668         status = encode_attr_size(xdr, res->bitmap, res->size);
669         if (unlikely(status != 0))
670                 goto out;
671         status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
672         if (unlikely(status != 0))
673                 goto out;
674         status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
675         *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
676 out:
677         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
678         return status;
679 }
680 
681 #if defined(CONFIG_NFS_V4_1)
682 
683 static __be32 encode_sessionid(struct xdr_stream *xdr,
684                                  const struct nfs4_sessionid *sid)
685 {
686         __be32 *p;
687         int len = NFS4_MAX_SESSIONID_LEN;
688 
689         p = xdr_reserve_space(xdr, len);
690         if (unlikely(p == NULL))
691                 return htonl(NFS4ERR_RESOURCE);
692 
693         memcpy(p, sid, len);
694         return 0;
695 }
696 
697 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
698                                        struct xdr_stream *xdr,
699                                        const struct cb_sequenceres *res)
700 {
701         __be32 *p;
702         __be32 status = res->csr_status;
703 
704         if (unlikely(status != 0))
705                 goto out;
706 
707         encode_sessionid(xdr, &res->csr_sessionid);
708 
709         p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
710         if (unlikely(p == NULL))
711                 return htonl(NFS4ERR_RESOURCE);
712 
713         *p++ = htonl(res->csr_sequenceid);
714         *p++ = htonl(res->csr_slotid);
715         *p++ = htonl(res->csr_highestslotid);
716         *p++ = htonl(res->csr_target_highestslotid);
717 out:
718         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
719         return status;
720 }
721 
722 static __be32
723 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
724 {
725         if (op_nr == OP_CB_SEQUENCE) {
726                 if (nop != 0)
727                         return htonl(NFS4ERR_SEQUENCE_POS);
728         } else {
729                 if (nop == 0)
730                         return htonl(NFS4ERR_OP_NOT_IN_SESSION);
731         }
732 
733         switch (op_nr) {
734         case OP_CB_GETATTR:
735         case OP_CB_RECALL:
736         case OP_CB_SEQUENCE:
737         case OP_CB_RECALL_ANY:
738         case OP_CB_RECALL_SLOT:
739         case OP_CB_LAYOUTRECALL:
740         case OP_CB_NOTIFY_DEVICEID:
741                 *op = &callback_ops[op_nr];
742                 break;
743 
744         case OP_CB_NOTIFY:
745         case OP_CB_PUSH_DELEG:
746         case OP_CB_RECALLABLE_OBJ_AVAIL:
747         case OP_CB_WANTS_CANCELLED:
748         case OP_CB_NOTIFY_LOCK:
749                 return htonl(NFS4ERR_NOTSUPP);
750 
751         default:
752                 return htonl(NFS4ERR_OP_ILLEGAL);
753         }
754 
755         return htonl(NFS_OK);
756 }
757 
758 static void nfs4_callback_free_slot(struct nfs4_session *session)
759 {
760         struct nfs4_slot_table *tbl = &session->bc_slot_table;
761 
762         spin_lock(&tbl->slot_tbl_lock);
763         /*
764          * Let the state manager know callback processing done.
765          * A single slot, so highest used slotid is either 0 or -1
766          */
767         tbl->highest_used_slotid = NFS4_NO_SLOT;
768         nfs4_slot_tbl_drain_complete(tbl);
769         spin_unlock(&tbl->slot_tbl_lock);
770 }
771 
772 static void nfs4_cb_free_slot(struct cb_process_state *cps)
773 {
774         if (cps->slotid != NFS4_NO_SLOT)
775                 nfs4_callback_free_slot(cps->clp->cl_session);
776 }
777 
778 #else /* CONFIG_NFS_V4_1 */
779 
780 static __be32
781 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
782 {
783         return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
784 }
785 
786 static void nfs4_cb_free_slot(struct cb_process_state *cps)
787 {
788 }
789 #endif /* CONFIG_NFS_V4_1 */
790 
791 #ifdef CONFIG_NFS_V4_2
792 static __be32
793 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
794 {
795         __be32 status = preprocess_nfs41_op(nop, op_nr, op);
796         if (status != htonl(NFS4ERR_OP_ILLEGAL))
797                 return status;
798 
799         if (op_nr == OP_CB_OFFLOAD)
800                 return htonl(NFS4ERR_NOTSUPP);
801         return htonl(NFS4ERR_OP_ILLEGAL);
802 }
803 #else /* CONFIG_NFS_V4_2 */
804 static __be32
805 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
806 {
807         return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
808 }
809 #endif /* CONFIG_NFS_V4_2 */
810 
811 static __be32
812 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
813 {
814         switch (op_nr) {
815         case OP_CB_GETATTR:
816         case OP_CB_RECALL:
817                 *op = &callback_ops[op_nr];
818                 break;
819         default:
820                 return htonl(NFS4ERR_OP_ILLEGAL);
821         }
822 
823         return htonl(NFS_OK);
824 }
825 
826 static __be32 process_op(int nop, struct svc_rqst *rqstp,
827                 struct xdr_stream *xdr_in, void *argp,
828                 struct xdr_stream *xdr_out, void *resp,
829                 struct cb_process_state *cps)
830 {
831         struct callback_op *op = &callback_ops[0];
832         unsigned int op_nr;
833         __be32 status;
834         long maxlen;
835         __be32 res;
836 
837         dprintk("%s: start\n", __func__);
838         status = decode_op_hdr(xdr_in, &op_nr);
839         if (unlikely(status))
840                 return status;
841 
842         dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
843                 __func__, cps->minorversion, nop, op_nr);
844 
845         switch (cps->minorversion) {
846         case 0:
847                 status = preprocess_nfs4_op(op_nr, &op);
848                 break;
849         case 1:
850                 status = preprocess_nfs41_op(nop, op_nr, &op);
851                 break;
852         case 2:
853                 status = preprocess_nfs42_op(nop, op_nr, &op);
854                 break;
855         default:
856                 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
857         }
858 
859         if (status == htonl(NFS4ERR_OP_ILLEGAL))
860                 op_nr = OP_CB_ILLEGAL;
861         if (status)
862                 goto encode_hdr;
863 
864         if (cps->drc_status) {
865                 status = cps->drc_status;
866                 goto encode_hdr;
867         }
868 
869         maxlen = xdr_out->end - xdr_out->p;
870         if (maxlen > 0 && maxlen < PAGE_SIZE) {
871                 status = op->decode_args(rqstp, xdr_in, argp);
872                 if (likely(status == 0))
873                         status = op->process_op(argp, resp, cps);
874         } else
875                 status = htonl(NFS4ERR_RESOURCE);
876 
877 encode_hdr:
878         res = encode_op_hdr(xdr_out, op_nr, status);
879         if (unlikely(res))
880                 return res;
881         if (op->encode_res != NULL && status == 0)
882                 status = op->encode_res(rqstp, xdr_out, resp);
883         dprintk("%s: done, status = %d\n", __func__, ntohl(status));
884         return status;
885 }
886 
887 /*
888  * Decode, process and encode a COMPOUND
889  */
890 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
891 {
892         struct cb_compound_hdr_arg hdr_arg = { 0 };
893         struct cb_compound_hdr_res hdr_res = { NULL };
894         struct xdr_stream xdr_in, xdr_out;
895         __be32 *p, status;
896         struct cb_process_state cps = {
897                 .drc_status = 0,
898                 .clp = NULL,
899                 .slotid = NFS4_NO_SLOT,
900                 .net = SVC_NET(rqstp),
901         };
902         unsigned int nops = 0;
903 
904         dprintk("%s: start\n", __func__);
905 
906         xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
907 
908         p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
909         xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
910 
911         status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
912         if (status == htonl(NFS4ERR_RESOURCE))
913                 return rpc_garbage_args;
914 
915         if (hdr_arg.minorversion == 0) {
916                 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
917                 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
918                         return rpc_drop_reply;
919         }
920 
921         cps.minorversion = hdr_arg.minorversion;
922         hdr_res.taglen = hdr_arg.taglen;
923         hdr_res.tag = hdr_arg.tag;
924         if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
925                 return rpc_system_err;
926 
927         while (status == 0 && nops != hdr_arg.nops) {
928                 status = process_op(nops, rqstp, &xdr_in,
929                                     argp, &xdr_out, resp, &cps);
930                 nops++;
931         }
932 
933         /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
934         * resource error in cb_compound status without returning op */
935         if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
936                 status = htonl(NFS4ERR_RESOURCE);
937                 nops--;
938         }
939 
940         *hdr_res.status = status;
941         *hdr_res.nops = htonl(nops);
942         nfs4_cb_free_slot(&cps);
943         nfs_put_client(cps.clp);
944         dprintk("%s: done, status = %u\n", __func__, ntohl(status));
945         return rpc_success;
946 }
947 
948 /*
949  * Define NFS4 callback COMPOUND ops.
950  */
951 static struct callback_op callback_ops[] = {
952         [0] = {
953                 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
954         },
955         [OP_CB_GETATTR] = {
956                 .process_op = (callback_process_op_t)nfs4_callback_getattr,
957                 .decode_args = (callback_decode_arg_t)decode_getattr_args,
958                 .encode_res = (callback_encode_res_t)encode_getattr_res,
959                 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
960         },
961         [OP_CB_RECALL] = {
962                 .process_op = (callback_process_op_t)nfs4_callback_recall,
963                 .decode_args = (callback_decode_arg_t)decode_recall_args,
964                 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
965         },
966 #if defined(CONFIG_NFS_V4_1)
967         [OP_CB_LAYOUTRECALL] = {
968                 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
969                 .decode_args =
970                         (callback_decode_arg_t)decode_layoutrecall_args,
971                 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
972         },
973         [OP_CB_NOTIFY_DEVICEID] = {
974                 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
975                 .decode_args =
976                         (callback_decode_arg_t)decode_devicenotify_args,
977                 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
978         },
979         [OP_CB_SEQUENCE] = {
980                 .process_op = (callback_process_op_t)nfs4_callback_sequence,
981                 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
982                 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
983                 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
984         },
985         [OP_CB_RECALL_ANY] = {
986                 .process_op = (callback_process_op_t)nfs4_callback_recallany,
987                 .decode_args = (callback_decode_arg_t)decode_recallany_args,
988                 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
989         },
990         [OP_CB_RECALL_SLOT] = {
991                 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
992                 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
993                 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
994         },
995 #endif /* CONFIG_NFS_V4_1 */
996 };
997 
998 /*
999  * Define NFS4 callback procedures
1000  */
1001 static struct svc_procedure nfs4_callback_procedures1[] = {
1002         [CB_NULL] = {
1003                 .pc_func = nfs4_callback_null,
1004                 .pc_decode = (kxdrproc_t)nfs4_decode_void,
1005                 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1006                 .pc_xdrressize = 1,
1007         },
1008         [CB_COMPOUND] = {
1009                 .pc_func = nfs4_callback_compound,
1010                 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1011                 .pc_argsize = 256,
1012                 .pc_ressize = 256,
1013                 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1014         }
1015 };
1016 
1017 struct svc_version nfs4_callback_version1 = {
1018         .vs_vers = 1,
1019         .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1020         .vs_proc = nfs4_callback_procedures1,
1021         .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1022         .vs_dispatch = NULL,
1023         .vs_hidden = 1,
1024 };
1025 
1026 struct svc_version nfs4_callback_version4 = {
1027         .vs_vers = 4,
1028         .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1029         .vs_proc = nfs4_callback_procedures1,
1030         .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1031         .vs_dispatch = NULL,
1032         .vs_hidden = 1,
1033 };
1034 

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