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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 
20 #define CB_OP_TAGLEN_MAXSZ (512)
21 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
22 #define CB_OP_GETATTR_BITMAP_MAXSZ (4)
23 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
24  CB_OP_GETATTR_BITMAP_MAXSZ + \
25  2 + 2 + 3 + 3)
26 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
27 
28 #if defined(CONFIG_NFS_V4_1)
29 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
30 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
31 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
32  4 + 1 + 3)
33 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
34 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
35 #endif /* CONFIG_NFS_V4_1 */
36 
37 #define NFSDBG_FACILITY NFSDBG_CALLBACK
38 
39 /* Internal error code */
40 #define NFS4ERR_RESOURCE_HDR 11050
41 
42 typedef __be32 (*callback_process_op_t)(void *, void *,
43  struct cb_process_state *);
44 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
45 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
46 
47 
48 struct callback_op {
49  callback_process_op_t process_op;
50  callback_decode_arg_t decode_args;
51  callback_encode_res_t encode_res;
52  long res_maxsize;
53 };
54 
55 static struct callback_op callback_ops[];
56 
57 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
58 {
59  return htonl(NFS4_OK);
60 }
61 
62 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
63 {
64  return xdr_argsize_check(rqstp, p);
65 }
66 
67 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
68 {
69  return xdr_ressize_check(rqstp, p);
70 }
71 
72 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
73 {
74  __be32 *p;
75 
76  p = xdr_inline_decode(xdr, nbytes);
77  if (unlikely(p == NULL))
78  printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
79  return p;
80 }
81 
82 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
83 {
84  __be32 *p;
85 
86  p = read_buf(xdr, 4);
87  if (unlikely(p == NULL))
88  return htonl(NFS4ERR_RESOURCE);
89  *len = ntohl(*p);
90 
91  if (*len != 0) {
92  p = read_buf(xdr, *len);
93  if (unlikely(p == NULL))
94  return htonl(NFS4ERR_RESOURCE);
95  *str = (const char *)p;
96  } else
97  *str = NULL;
98 
99  return 0;
100 }
101 
102 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
103 {
104  __be32 *p;
105 
106  p = read_buf(xdr, 4);
107  if (unlikely(p == NULL))
108  return htonl(NFS4ERR_RESOURCE);
109  fh->size = ntohl(*p);
110  if (fh->size > NFS4_FHSIZE)
111  return htonl(NFS4ERR_BADHANDLE);
112  p = read_buf(xdr, fh->size);
113  if (unlikely(p == NULL))
114  return htonl(NFS4ERR_RESOURCE);
115  memcpy(&fh->data[0], p, fh->size);
116  memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
117  return 0;
118 }
119 
120 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
121 {
122  __be32 *p;
123  unsigned int attrlen;
124 
125  p = read_buf(xdr, 4);
126  if (unlikely(p == NULL))
127  return htonl(NFS4ERR_RESOURCE);
128  attrlen = ntohl(*p);
129  p = read_buf(xdr, attrlen << 2);
130  if (unlikely(p == NULL))
131  return htonl(NFS4ERR_RESOURCE);
132  if (likely(attrlen > 0))
133  bitmap[0] = ntohl(*p++);
134  if (attrlen > 1)
135  bitmap[1] = ntohl(*p);
136  return 0;
137 }
138 
139 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
140 {
141  __be32 *p;
142 
143  p = read_buf(xdr, NFS4_STATEID_SIZE);
144  if (unlikely(p == NULL))
145  return htonl(NFS4ERR_RESOURCE);
146  memcpy(stateid, p, NFS4_STATEID_SIZE);
147  return 0;
148 }
149 
150 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
151 {
152  __be32 *p;
153  __be32 status;
154 
155  status = decode_string(xdr, &hdr->taglen, &hdr->tag);
156  if (unlikely(status != 0))
157  return status;
158  /* We do not like overly long tags! */
159  if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
160  printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
161  __func__, hdr->taglen);
162  return htonl(NFS4ERR_RESOURCE);
163  }
164  p = read_buf(xdr, 12);
165  if (unlikely(p == NULL))
166  return htonl(NFS4ERR_RESOURCE);
167  hdr->minorversion = ntohl(*p++);
168  /* Check minor version is zero or one. */
169  if (hdr->minorversion <= 1) {
170  hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */
171  } else {
172  pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
173  "illegal minor version %u!\n",
174  __func__, hdr->minorversion);
175  return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
176  }
177  hdr->nops = ntohl(*p);
178  dprintk("%s: minorversion %d nops %d\n", __func__,
179  hdr->minorversion, hdr->nops);
180  return 0;
181 }
182 
183 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
184 {
185  __be32 *p;
186  p = read_buf(xdr, 4);
187  if (unlikely(p == NULL))
188  return htonl(NFS4ERR_RESOURCE_HDR);
189  *op = ntohl(*p);
190  return 0;
191 }
192 
193 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
194 {
195  __be32 status;
196 
197  status = decode_fh(xdr, &args->fh);
198  if (unlikely(status != 0))
199  goto out;
200  args->addr = svc_addr(rqstp);
201  status = decode_bitmap(xdr, args->bitmap);
202 out:
203  dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
204  return status;
205 }
206 
207 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
208 {
209  __be32 *p;
210  __be32 status;
211 
212  args->addr = svc_addr(rqstp);
213  status = decode_stateid(xdr, &args->stateid);
214  if (unlikely(status != 0))
215  goto out;
216  p = read_buf(xdr, 4);
217  if (unlikely(p == NULL)) {
218  status = htonl(NFS4ERR_RESOURCE);
219  goto out;
220  }
221  args->truncate = ntohl(*p);
222  status = decode_fh(xdr, &args->fh);
223 out:
224  dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
225  return status;
226 }
227 
228 #if defined(CONFIG_NFS_V4_1)
229 
230 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
231  struct xdr_stream *xdr,
232  struct cb_layoutrecallargs *args)
233 {
234  __be32 *p;
235  __be32 status = 0;
236  uint32_t iomode;
237 
238  args->cbl_addr = svc_addr(rqstp);
239  p = read_buf(xdr, 4 * sizeof(uint32_t));
240  if (unlikely(p == NULL)) {
241  status = htonl(NFS4ERR_BADXDR);
242  goto out;
243  }
244 
245  args->cbl_layout_type = ntohl(*p++);
246  /* Depite the spec's xdr, iomode really belongs in the FILE switch,
247  * as it is unusable and ignored with the other types.
248  */
249  iomode = ntohl(*p++);
250  args->cbl_layoutchanged = ntohl(*p++);
251  args->cbl_recall_type = ntohl(*p++);
252 
253  if (args->cbl_recall_type == RETURN_FILE) {
254  args->cbl_range.iomode = iomode;
255  status = decode_fh(xdr, &args->cbl_fh);
256  if (unlikely(status != 0))
257  goto out;
258 
259  p = read_buf(xdr, 2 * sizeof(uint64_t));
260  if (unlikely(p == NULL)) {
261  status = htonl(NFS4ERR_BADXDR);
262  goto out;
263  }
264  p = xdr_decode_hyper(p, &args->cbl_range.offset);
265  p = xdr_decode_hyper(p, &args->cbl_range.length);
266  status = decode_stateid(xdr, &args->cbl_stateid);
267  if (unlikely(status != 0))
268  goto out;
269  } else if (args->cbl_recall_type == RETURN_FSID) {
270  p = read_buf(xdr, 2 * sizeof(uint64_t));
271  if (unlikely(p == NULL)) {
272  status = htonl(NFS4ERR_BADXDR);
273  goto out;
274  }
275  p = xdr_decode_hyper(p, &args->cbl_fsid.major);
276  p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
277  } else if (args->cbl_recall_type != RETURN_ALL) {
278  status = htonl(NFS4ERR_BADXDR);
279  goto out;
280  }
281  dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
282  __func__,
283  args->cbl_layout_type, iomode,
284  args->cbl_layoutchanged, args->cbl_recall_type);
285 out:
286  dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
287  return status;
288 }
289 
290 static
291 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
292  struct xdr_stream *xdr,
293  struct cb_devicenotifyargs *args)
294 {
295  __be32 *p;
296  __be32 status = 0;
297  u32 tmp;
298  int n, i;
299  args->ndevs = 0;
300 
301  /* Num of device notifications */
302  p = read_buf(xdr, sizeof(uint32_t));
303  if (unlikely(p == NULL)) {
304  status = htonl(NFS4ERR_BADXDR);
305  goto out;
306  }
307  n = ntohl(*p++);
308  if (n <= 0)
309  goto out;
310  if (n > ULONG_MAX / sizeof(*args->devs)) {
311  status = htonl(NFS4ERR_BADXDR);
312  goto out;
313  }
314 
315  args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
316  if (!args->devs) {
317  status = htonl(NFS4ERR_DELAY);
318  goto out;
319  }
320 
321  /* Decode each dev notification */
322  for (i = 0; i < n; i++) {
323  struct cb_devicenotifyitem *dev = &args->devs[i];
324 
325  p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
326  if (unlikely(p == NULL)) {
327  status = htonl(NFS4ERR_BADXDR);
328  goto err;
329  }
330 
331  tmp = ntohl(*p++); /* bitmap size */
332  if (tmp != 1) {
333  status = htonl(NFS4ERR_INVAL);
334  goto err;
335  }
336  dev->cbd_notify_type = ntohl(*p++);
337  if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
338  dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
339  status = htonl(NFS4ERR_INVAL);
340  goto err;
341  }
342 
343  tmp = ntohl(*p++); /* opaque size */
344  if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
345  (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
346  ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
347  (tmp != NFS4_DEVICEID4_SIZE + 4))) {
348  status = htonl(NFS4ERR_INVAL);
349  goto err;
350  }
351  dev->cbd_layout_type = ntohl(*p++);
352  memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
353  p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
354 
355  if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
356  p = read_buf(xdr, sizeof(uint32_t));
357  if (unlikely(p == NULL)) {
358  status = htonl(NFS4ERR_BADXDR);
359  goto err;
360  }
361  dev->cbd_immediate = ntohl(*p++);
362  } else {
363  dev->cbd_immediate = 0;
364  }
365 
366  args->ndevs++;
367 
368  dprintk("%s: type %d layout 0x%x immediate %d\n",
369  __func__, dev->cbd_notify_type, dev->cbd_layout_type,
370  dev->cbd_immediate);
371  }
372 out:
373  dprintk("%s: status %d ndevs %d\n",
374  __func__, ntohl(status), args->ndevs);
375  return status;
376 err:
377  kfree(args->devs);
378  goto out;
379 }
380 
381 static __be32 decode_sessionid(struct xdr_stream *xdr,
382  struct nfs4_sessionid *sid)
383 {
384  __be32 *p;
385  int len = NFS4_MAX_SESSIONID_LEN;
386 
387  p = read_buf(xdr, len);
388  if (unlikely(p == NULL))
389  return htonl(NFS4ERR_RESOURCE);
390 
391  memcpy(sid->data, p, len);
392  return 0;
393 }
394 
395 static __be32 decode_rc_list(struct xdr_stream *xdr,
396  struct referring_call_list *rc_list)
397 {
398  __be32 *p;
399  int i;
400  __be32 status;
401 
402  status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
403  if (status)
404  goto out;
405 
406  status = htonl(NFS4ERR_RESOURCE);
407  p = read_buf(xdr, sizeof(uint32_t));
408  if (unlikely(p == NULL))
409  goto out;
410 
411  rc_list->rcl_nrefcalls = ntohl(*p++);
412  if (rc_list->rcl_nrefcalls) {
413  p = read_buf(xdr,
414  rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
415  if (unlikely(p == NULL))
416  goto out;
417  rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
418  sizeof(*rc_list->rcl_refcalls),
419  GFP_KERNEL);
420  if (unlikely(rc_list->rcl_refcalls == NULL))
421  goto out;
422  for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
423  rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
424  rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
425  }
426  }
427  status = 0;
428 
429 out:
430  return status;
431 }
432 
433 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
434  struct xdr_stream *xdr,
435  struct cb_sequenceargs *args)
436 {
437  __be32 *p;
438  int i;
439  __be32 status;
440 
441  status = decode_sessionid(xdr, &args->csa_sessionid);
442  if (status)
443  goto out;
444 
445  status = htonl(NFS4ERR_RESOURCE);
446  p = read_buf(xdr, 5 * sizeof(uint32_t));
447  if (unlikely(p == NULL))
448  goto out;
449 
450  args->csa_addr = svc_addr(rqstp);
451  args->csa_sequenceid = ntohl(*p++);
452  args->csa_slotid = ntohl(*p++);
453  args->csa_highestslotid = ntohl(*p++);
454  args->csa_cachethis = ntohl(*p++);
455  args->csa_nrclists = ntohl(*p++);
456  args->csa_rclists = NULL;
457  if (args->csa_nrclists) {
458  args->csa_rclists = kmalloc_array(args->csa_nrclists,
459  sizeof(*args->csa_rclists),
460  GFP_KERNEL);
461  if (unlikely(args->csa_rclists == NULL))
462  goto out;
463 
464  for (i = 0; i < args->csa_nrclists; i++) {
465  status = decode_rc_list(xdr, &args->csa_rclists[i]);
466  if (status)
467  goto out_free;
468  }
469  }
470  status = 0;
471 
472  dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
473  "highestslotid %u cachethis %d nrclists %u\n",
474  __func__,
475  ((u32 *)&args->csa_sessionid)[0],
476  ((u32 *)&args->csa_sessionid)[1],
477  ((u32 *)&args->csa_sessionid)[2],
478  ((u32 *)&args->csa_sessionid)[3],
479  args->csa_sequenceid, args->csa_slotid,
480  args->csa_highestslotid, args->csa_cachethis,
481  args->csa_nrclists);
482 out:
483  dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
484  return status;
485 
486 out_free:
487  for (i = 0; i < args->csa_nrclists; i++)
488  kfree(args->csa_rclists[i].rcl_refcalls);
489  kfree(args->csa_rclists);
490  goto out;
491 }
492 
493 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
494  struct xdr_stream *xdr,
495  struct cb_recallanyargs *args)
496 {
497  uint32_t bitmap[2];
498  __be32 *p, status;
499 
500  args->craa_addr = svc_addr(rqstp);
501  p = read_buf(xdr, 4);
502  if (unlikely(p == NULL))
503  return htonl(NFS4ERR_BADXDR);
504  args->craa_objs_to_keep = ntohl(*p++);
505  status = decode_bitmap(xdr, bitmap);
506  if (unlikely(status))
507  return status;
508  args->craa_type_mask = bitmap[0];
509 
510  return 0;
511 }
512 
513 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
514  struct xdr_stream *xdr,
515  struct cb_recallslotargs *args)
516 {
517  __be32 *p;
518 
519  args->crsa_addr = svc_addr(rqstp);
520  p = read_buf(xdr, 4);
521  if (unlikely(p == NULL))
522  return htonl(NFS4ERR_BADXDR);
523  args->crsa_target_max_slots = ntohl(*p++);
524  return 0;
525 }
526 
527 #endif /* CONFIG_NFS_V4_1 */
528 
529 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
530 {
531  __be32 *p;
532 
533  p = xdr_reserve_space(xdr, 4 + len);
534  if (unlikely(p == NULL))
535  return htonl(NFS4ERR_RESOURCE);
536  xdr_encode_opaque(p, str, len);
537  return 0;
538 }
539 
540 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
541 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
542 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
543 {
544  __be32 bm[2];
545  __be32 *p;
546 
547  bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
548  bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
549  if (bm[1] != 0) {
550  p = xdr_reserve_space(xdr, 16);
551  if (unlikely(p == NULL))
552  return htonl(NFS4ERR_RESOURCE);
553  *p++ = htonl(2);
554  *p++ = bm[0];
555  *p++ = bm[1];
556  } else if (bm[0] != 0) {
557  p = xdr_reserve_space(xdr, 12);
558  if (unlikely(p == NULL))
559  return htonl(NFS4ERR_RESOURCE);
560  *p++ = htonl(1);
561  *p++ = bm[0];
562  } else {
563  p = xdr_reserve_space(xdr, 8);
564  if (unlikely(p == NULL))
565  return htonl(NFS4ERR_RESOURCE);
566  *p++ = htonl(0);
567  }
568  *savep = p;
569  return 0;
570 }
571 
572 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
573 {
574  __be32 *p;
575 
576  if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
577  return 0;
578  p = xdr_reserve_space(xdr, 8);
579  if (unlikely(!p))
580  return htonl(NFS4ERR_RESOURCE);
581  p = xdr_encode_hyper(p, change);
582  return 0;
583 }
584 
585 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
586 {
587  __be32 *p;
588 
589  if (!(bitmap[0] & FATTR4_WORD0_SIZE))
590  return 0;
591  p = xdr_reserve_space(xdr, 8);
592  if (unlikely(!p))
593  return htonl(NFS4ERR_RESOURCE);
594  p = xdr_encode_hyper(p, size);
595  return 0;
596 }
597 
598 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
599 {
600  __be32 *p;
601 
602  p = xdr_reserve_space(xdr, 12);
603  if (unlikely(!p))
604  return htonl(NFS4ERR_RESOURCE);
605  p = xdr_encode_hyper(p, time->tv_sec);
606  *p = htonl(time->tv_nsec);
607  return 0;
608 }
609 
610 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
611 {
612  if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
613  return 0;
614  return encode_attr_time(xdr,time);
615 }
616 
617 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
618 {
619  if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
620  return 0;
621  return encode_attr_time(xdr,time);
622 }
623 
624 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
625 {
626  __be32 status;
627 
628  hdr->status = xdr_reserve_space(xdr, 4);
629  if (unlikely(hdr->status == NULL))
630  return htonl(NFS4ERR_RESOURCE);
631  status = encode_string(xdr, hdr->taglen, hdr->tag);
632  if (unlikely(status != 0))
633  return status;
634  hdr->nops = xdr_reserve_space(xdr, 4);
635  if (unlikely(hdr->nops == NULL))
636  return htonl(NFS4ERR_RESOURCE);
637  return 0;
638 }
639 
640 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
641 {
642  __be32 *p;
643 
644  p = xdr_reserve_space(xdr, 8);
645  if (unlikely(p == NULL))
646  return htonl(NFS4ERR_RESOURCE_HDR);
647  *p++ = htonl(op);
648  *p = res;
649  return 0;
650 }
651 
652 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
653 {
654  __be32 *savep = NULL;
655  __be32 status = res->status;
656 
657  if (unlikely(status != 0))
658  goto out;
659  status = encode_attr_bitmap(xdr, res->bitmap, &savep);
660  if (unlikely(status != 0))
661  goto out;
662  status = encode_attr_change(xdr, res->bitmap, res->change_attr);
663  if (unlikely(status != 0))
664  goto out;
665  status = encode_attr_size(xdr, res->bitmap, res->size);
666  if (unlikely(status != 0))
667  goto out;
668  status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
669  if (unlikely(status != 0))
670  goto out;
671  status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
672  *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
673 out:
674  dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
675  return status;
676 }
677 
678 #if defined(CONFIG_NFS_V4_1)
679 
680 static __be32 encode_sessionid(struct xdr_stream *xdr,
681  const struct nfs4_sessionid *sid)
682 {
683  __be32 *p;
684  int len = NFS4_MAX_SESSIONID_LEN;
685 
686  p = xdr_reserve_space(xdr, len);
687  if (unlikely(p == NULL))
688  return htonl(NFS4ERR_RESOURCE);
689 
690  memcpy(p, sid, len);
691  return 0;
692 }
693 
694 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
695  struct xdr_stream *xdr,
696  const struct cb_sequenceres *res)
697 {
698  __be32 *p;
699  __be32 status = res->csr_status;
700 
701  if (unlikely(status != 0))
702  goto out;
703 
704  encode_sessionid(xdr, &res->csr_sessionid);
705 
706  p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
707  if (unlikely(p == NULL))
708  return htonl(NFS4ERR_RESOURCE);
709 
710  *p++ = htonl(res->csr_sequenceid);
711  *p++ = htonl(res->csr_slotid);
712  *p++ = htonl(res->csr_highestslotid);
713  *p++ = htonl(res->csr_target_highestslotid);
714 out:
715  dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
716  return status;
717 }
718 
719 static __be32
720 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
721 {
722  if (op_nr == OP_CB_SEQUENCE) {
723  if (nop != 0)
724  return htonl(NFS4ERR_SEQUENCE_POS);
725  } else {
726  if (nop == 0)
727  return htonl(NFS4ERR_OP_NOT_IN_SESSION);
728  }
729 
730  switch (op_nr) {
731  case OP_CB_GETATTR:
732  case OP_CB_RECALL:
733  case OP_CB_SEQUENCE:
734  case OP_CB_RECALL_ANY:
735  case OP_CB_RECALL_SLOT:
736  case OP_CB_LAYOUTRECALL:
737  case OP_CB_NOTIFY_DEVICEID:
738  *op = &callback_ops[op_nr];
739  break;
740 
741  case OP_CB_NOTIFY:
742  case OP_CB_PUSH_DELEG:
743  case OP_CB_RECALLABLE_OBJ_AVAIL:
744  case OP_CB_WANTS_CANCELLED:
745  case OP_CB_NOTIFY_LOCK:
746  return htonl(NFS4ERR_NOTSUPP);
747 
748  default:
749  return htonl(NFS4ERR_OP_ILLEGAL);
750  }
751 
752  return htonl(NFS_OK);
753 }
754 
755 static void nfs4_callback_free_slot(struct nfs4_session *session)
756 {
757  struct nfs4_slot_table *tbl = &session->bc_slot_table;
758 
759  spin_lock(&tbl->slot_tbl_lock);
760  /*
761  * Let the state manager know callback processing done.
762  * A single slot, so highest used slotid is either 0 or -1
763  */
764  tbl->highest_used_slotid = NFS4_NO_SLOT;
765  nfs4_check_drain_bc_complete(session);
766  spin_unlock(&tbl->slot_tbl_lock);
767 }
768 
769 static void nfs4_cb_free_slot(struct cb_process_state *cps)
770 {
771  if (cps->slotid != NFS4_NO_SLOT)
772  nfs4_callback_free_slot(cps->clp->cl_session);
773 }
774 
775 #else /* CONFIG_NFS_V4_1 */
776 
777 static __be32
778 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
779 {
780  return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
781 }
782 
783 static void nfs4_cb_free_slot(struct cb_process_state *cps)
784 {
785 }
786 #endif /* CONFIG_NFS_V4_1 */
787 
788 static __be32
789 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
790 {
791  switch (op_nr) {
792  case OP_CB_GETATTR:
793  case OP_CB_RECALL:
794  *op = &callback_ops[op_nr];
795  break;
796  default:
797  return htonl(NFS4ERR_OP_ILLEGAL);
798  }
799 
800  return htonl(NFS_OK);
801 }
802 
803 static __be32 process_op(uint32_t minorversion, int nop,
804  struct svc_rqst *rqstp,
805  struct xdr_stream *xdr_in, void *argp,
806  struct xdr_stream *xdr_out, void *resp,
807  struct cb_process_state *cps)
808 {
809  struct callback_op *op = &callback_ops[0];
810  unsigned int op_nr;
811  __be32 status;
812  long maxlen;
813  __be32 res;
814 
815  dprintk("%s: start\n", __func__);
816  status = decode_op_hdr(xdr_in, &op_nr);
817  if (unlikely(status))
818  return status;
819 
820  dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
821  __func__, minorversion, nop, op_nr);
822 
823  status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) :
824  preprocess_nfs4_op(op_nr, &op);
825  if (status == htonl(NFS4ERR_OP_ILLEGAL))
826  op_nr = OP_CB_ILLEGAL;
827  if (status)
828  goto encode_hdr;
829 
830  if (cps->drc_status) {
831  status = cps->drc_status;
832  goto encode_hdr;
833  }
834 
835  maxlen = xdr_out->end - xdr_out->p;
836  if (maxlen > 0 && maxlen < PAGE_SIZE) {
837  status = op->decode_args(rqstp, xdr_in, argp);
838  if (likely(status == 0))
839  status = op->process_op(argp, resp, cps);
840  } else
841  status = htonl(NFS4ERR_RESOURCE);
842 
843 encode_hdr:
844  res = encode_op_hdr(xdr_out, op_nr, status);
845  if (unlikely(res))
846  return res;
847  if (op->encode_res != NULL && status == 0)
848  status = op->encode_res(rqstp, xdr_out, resp);
849  dprintk("%s: done, status = %d\n", __func__, ntohl(status));
850  return status;
851 }
852 
853 /*
854  * Decode, process and encode a COMPOUND
855  */
856 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
857 {
858  struct cb_compound_hdr_arg hdr_arg = { 0 };
859  struct cb_compound_hdr_res hdr_res = { NULL };
860  struct xdr_stream xdr_in, xdr_out;
861  __be32 *p, status;
862  struct cb_process_state cps = {
863  .drc_status = 0,
864  .clp = NULL,
865  .slotid = NFS4_NO_SLOT,
866  .net = SVC_NET(rqstp),
867  };
868  unsigned int nops = 0;
869 
870  dprintk("%s: start\n", __func__);
871 
872  xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
873 
874  p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
875  xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
876 
877  status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
878  if (status == __constant_htonl(NFS4ERR_RESOURCE))
879  return rpc_garbage_args;
880 
881  if (hdr_arg.minorversion == 0) {
882  cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
883  if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
884  return rpc_drop_reply;
885  }
886 
887  hdr_res.taglen = hdr_arg.taglen;
888  hdr_res.tag = hdr_arg.tag;
889  if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
890  return rpc_system_err;
891 
892  while (status == 0 && nops != hdr_arg.nops) {
893  status = process_op(hdr_arg.minorversion, nops, rqstp,
894  &xdr_in, argp, &xdr_out, resp, &cps);
895  nops++;
896  }
897 
898  /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
899  * resource error in cb_compound status without returning op */
900  if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
901  status = htonl(NFS4ERR_RESOURCE);
902  nops--;
903  }
904 
905  *hdr_res.status = status;
906  *hdr_res.nops = htonl(nops);
907  nfs4_cb_free_slot(&cps);
908  nfs_put_client(cps.clp);
909  dprintk("%s: done, status = %u\n", __func__, ntohl(status));
910  return rpc_success;
911 }
912 
913 /*
914  * Define NFS4 callback COMPOUND ops.
915  */
916 static struct callback_op callback_ops[] = {
917  [0] = {
918  .res_maxsize = CB_OP_HDR_RES_MAXSZ,
919  },
920  [OP_CB_GETATTR] = {
921  .process_op = (callback_process_op_t)nfs4_callback_getattr,
922  .decode_args = (callback_decode_arg_t)decode_getattr_args,
923  .encode_res = (callback_encode_res_t)encode_getattr_res,
924  .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
925  },
926  [OP_CB_RECALL] = {
927  .process_op = (callback_process_op_t)nfs4_callback_recall,
928  .decode_args = (callback_decode_arg_t)decode_recall_args,
929  .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
930  },
931 #if defined(CONFIG_NFS_V4_1)
932  [OP_CB_LAYOUTRECALL] = {
933  .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
934  .decode_args =
935  (callback_decode_arg_t)decode_layoutrecall_args,
936  .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
937  },
938  [OP_CB_NOTIFY_DEVICEID] = {
939  .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
940  .decode_args =
941  (callback_decode_arg_t)decode_devicenotify_args,
942  .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
943  },
944  [OP_CB_SEQUENCE] = {
945  .process_op = (callback_process_op_t)nfs4_callback_sequence,
946  .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
947  .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
948  .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
949  },
950  [OP_CB_RECALL_ANY] = {
951  .process_op = (callback_process_op_t)nfs4_callback_recallany,
952  .decode_args = (callback_decode_arg_t)decode_recallany_args,
953  .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
954  },
955  [OP_CB_RECALL_SLOT] = {
956  .process_op = (callback_process_op_t)nfs4_callback_recallslot,
957  .decode_args = (callback_decode_arg_t)decode_recallslot_args,
958  .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
959  },
960 #endif /* CONFIG_NFS_V4_1 */
961 };
962 
963 /*
964  * Define NFS4 callback procedures
965  */
966 static struct svc_procedure nfs4_callback_procedures1[] = {
967  [CB_NULL] = {
968  .pc_func = nfs4_callback_null,
969  .pc_decode = (kxdrproc_t)nfs4_decode_void,
970  .pc_encode = (kxdrproc_t)nfs4_encode_void,
971  .pc_xdrressize = 1,
972  },
973  [CB_COMPOUND] = {
974  .pc_func = nfs4_callback_compound,
975  .pc_encode = (kxdrproc_t)nfs4_encode_void,
976  .pc_argsize = 256,
977  .pc_ressize = 256,
978  .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
979  }
980 };
981 
982 struct svc_version nfs4_callback_version1 = {
983  .vs_vers = 1,
984  .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
985  .vs_proc = nfs4_callback_procedures1,
986  .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
987  .vs_dispatch = NULL,
988  .vs_hidden = 1,
989 };
990 
991 struct svc_version nfs4_callback_version4 = {
992  .vs_vers = 4,
993  .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
994  .vs_proc = nfs4_callback_procedures1,
995  .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
996  .vs_dispatch = NULL,
997  .vs_hidden = 1,
998 };
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