fs/nfs/callback_xdr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/nfs/callback_xdr.c
   4  *
   5  * Copyright (C) 2004 Trond Myklebust
   6  *
   7  * NFSv4 callback encode/decode procedures
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/sunrpc/svc.h>
  11 #include <linux/nfs4.h>
  12 #include <linux/nfs_fs.h>
  13 #include <linux/ratelimit.h>
  14 #include <linux/printk.h>
  15 #include <linux/slab.h>
  16 #include <linux/sunrpc/bc_xprt.h>
  17 #include "nfs4_fs.h"
  18 #include "callback.h"
  19 #include "internal.h"
  20 #include "nfs4session.h"
  21 #include "nfs4trace.h"
  22
  23 #define CB_OP_TAGLEN_MAXSZ              (512)
  24 #define CB_OP_HDR_RES_MAXSZ             (2 * 4) // opcode, status
  25 #define CB_OP_GETATTR_BITMAP_MAXSZ      (4 * 4) // bitmap length, 3 bitmaps
  26 #define CB_OP_GETATTR_RES_MAXSZ         (CB_OP_HDR_RES_MAXSZ + \
  27                                          CB_OP_GETATTR_BITMAP_MAXSZ + \
  28                                          /* change, size, ctime, mtime */\
  29                                          (2 + 2 + 3 + 3) * 4)
  30 #define CB_OP_RECALL_RES_MAXSZ          (CB_OP_HDR_RES_MAXSZ)
  31
  32 #if defined(CONFIG_NFS_V4_1)
  33 #define CB_OP_LAYOUTRECALL_RES_MAXSZ    (CB_OP_HDR_RES_MAXSZ)
  34 #define CB_OP_DEVICENOTIFY_RES_MAXSZ    (CB_OP_HDR_RES_MAXSZ)
  35 #define CB_OP_SEQUENCE_RES_MAXSZ        (CB_OP_HDR_RES_MAXSZ + \
  36                                          NFS4_MAX_SESSIONID_LEN + \
  37                                          (1 + 3) * 4) // seqid, 3 slotids
  38 #define CB_OP_RECALLANY_RES_MAXSZ       (CB_OP_HDR_RES_MAXSZ)
  39 #define CB_OP_RECALLSLOT_RES_MAXSZ      (CB_OP_HDR_RES_MAXSZ)
  40 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ     (CB_OP_HDR_RES_MAXSZ)
  41 #endif /* CONFIG_NFS_V4_1 */
  42 #ifdef CONFIG_NFS_V4_2
  43 #define CB_OP_OFFLOAD_RES_MAXSZ         (CB_OP_HDR_RES_MAXSZ)
  44 #endif /* CONFIG_NFS_V4_2 */
  45
  46 #define NFSDBG_FACILITY NFSDBG_CALLBACK
  47
  48 /* Internal error code */
  49 #define NFS4ERR_RESOURCE_HDR    11050
  50
  51 struct callback_op {
  52         __be32 (*process_op)(void *, void *, struct cb_process_state *);
  53         __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
  54         __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
  55                         const void *);
  56         long res_maxsize;
  57 };
  58
  59 static struct callback_op callback_ops[];
  60
  61 static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
  62 {
  63         return htonl(NFS4_OK);
  64 }
  65
  66 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p)
  67 {
  68         return xdr_argsize_check(rqstp, p);
  69 }
  70
  71 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p)
  72 {
  73         return xdr_ressize_check(rqstp, p);
  74 }
  75
  76 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
  77                 const char **str, size_t maxlen)
  78 {
  79         ssize_t err;
  80
  81         err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
  82         if (err < 0)
  83                 return cpu_to_be32(NFS4ERR_RESOURCE);
  84         *len = err;
  85         return 0;
  86 }
  87
  88 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
  89 {
  90         __be32 *p;
  91
  92         p = xdr_inline_decode(xdr, 4);
  93         if (unlikely(p == NULL))
  94                 return htonl(NFS4ERR_RESOURCE);
  95         fh->size = ntohl(*p);
  96         if (fh->size > NFS4_FHSIZE)
  97                 return htonl(NFS4ERR_BADHANDLE);
  98         p = xdr_inline_decode(xdr, fh->size);
  99         if (unlikely(p == NULL))
 100                 return htonl(NFS4ERR_RESOURCE);
 101         memcpy(&fh->data[0], p, fh->size);
 102         memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
 103         return 0;
 104 }
 105
 106 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
 107 {
 108         __be32 *p;
 109         unsigned int attrlen;
 110
 111         p = xdr_inline_decode(xdr, 4);
 112         if (unlikely(p == NULL))
 113                 return htonl(NFS4ERR_RESOURCE);
 114         attrlen = ntohl(*p);
 115         p = xdr_inline_decode(xdr, attrlen << 2);
 116         if (unlikely(p == NULL))
 117                 return htonl(NFS4ERR_RESOURCE);
 118         if (likely(attrlen > 0))
 119                 bitmap[0] = ntohl(*p++);
 120         if (attrlen > 1)
 121                 bitmap[1] = ntohl(*p);
 122         return 0;
 123 }
 124
 125 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
 126 {
 127         __be32 *p;
 128
 129         p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
 130         if (unlikely(p == NULL))
 131                 return htonl(NFS4ERR_RESOURCE);
 132         memcpy(stateid->data, p, NFS4_STATEID_SIZE);
 133         return 0;
 134 }
 135
 136 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
 137 {
 138         stateid->type = NFS4_DELEGATION_STATEID_TYPE;
 139         return decode_stateid(xdr, stateid);
 140 }
 141
 142 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
 143 {
 144         __be32 *p;
 145         __be32 status;
 146
 147         status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
 148         if (unlikely(status != 0))
 149                 return status;
 150         p = xdr_inline_decode(xdr, 12);
 151         if (unlikely(p == NULL))
 152                 return htonl(NFS4ERR_RESOURCE);
 153         hdr->minorversion = ntohl(*p++);
 154         /* Check for minor version support */
 155         if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
 156                 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
 157         } else {
 158                 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
 159                         "illegal minor version %u!\n",
 160                         __func__, hdr->minorversion);
 161                 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
 162         }
 163         hdr->nops = ntohl(*p);
 164         return 0;
 165 }
 166
 167 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
 168 {
 169         __be32 *p;
 170         p = xdr_inline_decode(xdr, 4);
 171         if (unlikely(p == NULL))
 172                 return htonl(NFS4ERR_RESOURCE_HDR);
 173         *op = ntohl(*p);
 174         return 0;
 175 }
 176
 177 static __be32 decode_getattr_args(struct svc_rqst *rqstp,
 178                 struct xdr_stream *xdr, void *argp)
 179 {
 180         struct cb_getattrargs *args = argp;
 181         __be32 status;
 182
 183         status = decode_fh(xdr, &args->fh);
 184         if (unlikely(status != 0))
 185                 return status;
 186         return decode_bitmap(xdr, args->bitmap);
 187 }
 188
 189 static __be32 decode_recall_args(struct svc_rqst *rqstp,
 190                 struct xdr_stream *xdr, void *argp)
 191 {
 192         struct cb_recallargs *args = argp;
 193         __be32 *p;
 194         __be32 status;
 195
 196         status = decode_delegation_stateid(xdr, &args->stateid);
 197         if (unlikely(status != 0))
 198                 return status;
 199         p = xdr_inline_decode(xdr, 4);
 200         if (unlikely(p == NULL))
 201                 return htonl(NFS4ERR_RESOURCE);
 202         args->truncate = ntohl(*p);
 203         return decode_fh(xdr, &args->fh);
 204 }
 205
 206 #if defined(CONFIG_NFS_V4_1)
 207 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
 208 {
 209         stateid->type = NFS4_LAYOUT_STATEID_TYPE;
 210         return decode_stateid(xdr, stateid);
 211 }
 212
 213 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
 214                                        struct xdr_stream *xdr, void *argp)
 215 {
 216         struct cb_layoutrecallargs *args = argp;
 217         __be32 *p;
 218         __be32 status = 0;
 219         uint32_t iomode;
 220
 221         p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t));
 222         if (unlikely(p == NULL))
 223                 return htonl(NFS4ERR_BADXDR);
 224
 225         args->cbl_layout_type = ntohl(*p++);
 226         /* Depite the spec's xdr, iomode really belongs in the FILE switch,
 227          * as it is unusable and ignored with the other types.
 228          */
 229         iomode = ntohl(*p++);
 230         args->cbl_layoutchanged = ntohl(*p++);
 231         args->cbl_recall_type = ntohl(*p++);
 232
 233         if (args->cbl_recall_type == RETURN_FILE) {
 234                 args->cbl_range.iomode = iomode;
 235                 status = decode_fh(xdr, &args->cbl_fh);
 236                 if (unlikely(status != 0))
 237                         return status;
 238
 239                 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
 240                 if (unlikely(p == NULL))
 241                         return htonl(NFS4ERR_BADXDR);
 242                 p = xdr_decode_hyper(p, &args->cbl_range.offset);
 243                 p = xdr_decode_hyper(p, &args->cbl_range.length);
 244                 return decode_layout_stateid(xdr, &args->cbl_stateid);
 245         } else if (args->cbl_recall_type == RETURN_FSID) {
 246                 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
 247                 if (unlikely(p == NULL))
 248                         return htonl(NFS4ERR_BADXDR);
 249                 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
 250                 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
 251         } else if (args->cbl_recall_type != RETURN_ALL)
 252                 return htonl(NFS4ERR_BADXDR);
 253         return 0;
 254 }
 255
 256 static
 257 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
 258                                 struct xdr_stream *xdr,
 259                                 void *argp)
 260 {
 261         struct cb_devicenotifyargs *args = argp;
 262         __be32 *p;
 263         __be32 status = 0;
 264         u32 tmp;
 265         int n, i;
 266         args->ndevs = 0;
 267
 268         /* Num of device notifications */
 269         p = xdr_inline_decode(xdr, sizeof(uint32_t));
 270         if (unlikely(p == NULL)) {
 271                 status = htonl(NFS4ERR_BADXDR);
 272                 goto out;
 273         }
 274         n = ntohl(*p++);
 275         if (n <= 0)
 276                 goto out;
 277         if (n > ULONG_MAX / sizeof(*args->devs)) {
 278                 status = htonl(NFS4ERR_BADXDR);
 279                 goto out;
 280         }
 281
 282         args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
 283         if (!args->devs) {
 284                 status = htonl(NFS4ERR_DELAY);
 285                 goto out;
 286         }
 287
 288         /* Decode each dev notification */
 289         for (i = 0; i < n; i++) {
 290                 struct cb_devicenotifyitem *dev = &args->devs[i];
 291
 292                 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) +
 293                                       NFS4_DEVICEID4_SIZE);
 294                 if (unlikely(p == NULL)) {
 295                         status = htonl(NFS4ERR_BADXDR);
 296                         goto err;
 297                 }
 298
 299                 tmp = ntohl(*p++);      /* bitmap size */
 300                 if (tmp != 1) {
 301                         status = htonl(NFS4ERR_INVAL);
 302                         goto err;
 303                 }
 304                 dev->cbd_notify_type = ntohl(*p++);
 305                 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
 306                     dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
 307                         status = htonl(NFS4ERR_INVAL);
 308                         goto err;
 309                 }
 310
 311                 tmp = ntohl(*p++);      /* opaque size */
 312                 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
 313                      (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
 314                     ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
 315                      (tmp != NFS4_DEVICEID4_SIZE + 4))) {
 316                         status = htonl(NFS4ERR_INVAL);
 317                         goto err;
 318                 }
 319                 dev->cbd_layout_type = ntohl(*p++);
 320                 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
 321                 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
 322
 323                 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
 324                         p = xdr_inline_decode(xdr, sizeof(uint32_t));
 325                         if (unlikely(p == NULL)) {
 326                                 status = htonl(NFS4ERR_BADXDR);
 327                                 goto err;
 328                         }
 329                         dev->cbd_immediate = ntohl(*p++);
 330                 } else {
 331                         dev->cbd_immediate = 0;
 332                 }
 333
 334                 args->ndevs++;
 335
 336                 dprintk("%s: type %d layout 0x%x immediate %d\n",
 337                         __func__, dev->cbd_notify_type, dev->cbd_layout_type,
 338                         dev->cbd_immediate);
 339         }
 340 out:
 341         dprintk("%s: status %d ndevs %d\n",
 342                 __func__, ntohl(status), args->ndevs);
 343         return status;
 344 err:
 345         kfree(args->devs);
 346         goto out;
 347 }
 348
 349 static __be32 decode_sessionid(struct xdr_stream *xdr,
 350                                  struct nfs4_sessionid *sid)
 351 {
 352         __be32 *p;
 353
 354         p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN);
 355         if (unlikely(p == NULL))
 356                 return htonl(NFS4ERR_RESOURCE);
 357
 358         memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
 359         return 0;
 360 }
 361
 362 static __be32 decode_rc_list(struct xdr_stream *xdr,
 363                                struct referring_call_list *rc_list)
 364 {
 365         __be32 *p;
 366         int i;
 367         __be32 status;
 368
 369         status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
 370         if (status)
 371                 goto out;
 372
 373         status = htonl(NFS4ERR_RESOURCE);
 374         p = xdr_inline_decode(xdr, sizeof(uint32_t));
 375         if (unlikely(p == NULL))
 376                 goto out;
 377
 378         rc_list->rcl_nrefcalls = ntohl(*p++);
 379         if (rc_list->rcl_nrefcalls) {
 380                 p = xdr_inline_decode(xdr,
 381                              rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
 382                 if (unlikely(p == NULL))
 383                         goto out;
 384                 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
 385                                                 sizeof(*rc_list->rcl_refcalls),
 386                                                 GFP_KERNEL);
 387                 if (unlikely(rc_list->rcl_refcalls == NULL))
 388                         goto out;
 389                 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
 390                         rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
 391                         rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
 392                 }
 393         }
 394         status = 0;
 395
 396 out:
 397         return status;
 398 }
 399
 400 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
 401                                         struct xdr_stream *xdr,
 402                                         void *argp)
 403 {
 404         struct cb_sequenceargs *args = argp;
 405         __be32 *p;
 406         int i;
 407         __be32 status;
 408
 409         status = decode_sessionid(xdr, &args->csa_sessionid);
 410         if (status)
 411                 return status;
 412
 413         p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t));
 414         if (unlikely(p == NULL))
 415                 return htonl(NFS4ERR_RESOURCE);
 416
 417         args->csa_addr = svc_addr(rqstp);
 418         args->csa_sequenceid = ntohl(*p++);
 419         args->csa_slotid = ntohl(*p++);
 420         args->csa_highestslotid = ntohl(*p++);
 421         args->csa_cachethis = ntohl(*p++);
 422         args->csa_nrclists = ntohl(*p++);
 423         args->csa_rclists = NULL;
 424         if (args->csa_nrclists) {
 425                 args->csa_rclists = kmalloc_array(args->csa_nrclists,
 426                                                   sizeof(*args->csa_rclists),
 427                                                   GFP_KERNEL);
 428                 if (unlikely(args->csa_rclists == NULL))
 429                         return htonl(NFS4ERR_RESOURCE);
 430
 431                 for (i = 0; i < args->csa_nrclists; i++) {
 432                         status = decode_rc_list(xdr, &args->csa_rclists[i]);
 433                         if (status) {
 434                                 args->csa_nrclists = i;
 435                                 goto out_free;
 436                         }
 437                 }
 438         }
 439         return 0;
 440
 441 out_free:
 442         for (i = 0; i < args->csa_nrclists; i++)
 443                 kfree(args->csa_rclists[i].rcl_refcalls);
 444         kfree(args->csa_rclists);
 445         return status;
 446 }
 447
 448 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
 449                                       struct xdr_stream *xdr,
 450                                       void *argp)
 451 {
 452         struct cb_recallanyargs *args = argp;
 453         uint32_t bitmap[2];
 454         __be32 *p, status;
 455
 456         p = xdr_inline_decode(xdr, 4);
 457         if (unlikely(p == NULL))
 458                 return htonl(NFS4ERR_BADXDR);
 459         args->craa_objs_to_keep = ntohl(*p++);
 460         status = decode_bitmap(xdr, bitmap);
 461         if (unlikely(status))
 462                 return status;
 463         args->craa_type_mask = bitmap[0];
 464
 465         return 0;
 466 }
 467
 468 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
 469                                         struct xdr_stream *xdr,
 470                                         void *argp)
 471 {
 472         struct cb_recallslotargs *args = argp;
 473         __be32 *p;
 474
 475         p = xdr_inline_decode(xdr, 4);
 476         if (unlikely(p == NULL))
 477                 return htonl(NFS4ERR_BADXDR);
 478         args->crsa_target_highest_slotid = ntohl(*p++);
 479         return 0;
 480 }
 481
 482 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
 483 {
 484         __be32          *p;
 485         unsigned int    len;
 486
 487         p = xdr_inline_decode(xdr, 12);
 488         if (unlikely(p == NULL))
 489                 return htonl(NFS4ERR_BADXDR);
 490
 491         p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
 492         len = be32_to_cpu(*p);
 493
 494         p = xdr_inline_decode(xdr, len);
 495         if (unlikely(p == NULL))
 496                 return htonl(NFS4ERR_BADXDR);
 497
 498         /* Only try to decode if the length is right */
 499         if (len == 20) {
 500                 p += 2; /* skip "lock id:" */
 501                 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
 502                 xdr_decode_hyper(p, &args->cbnl_owner.id);
 503                 args->cbnl_valid = true;
 504         } else {
 505                 args->cbnl_owner.s_dev = 0;
 506                 args->cbnl_owner.id = 0;
 507                 args->cbnl_valid = false;
 508         }
 509         return 0;
 510 }
 511
 512 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
 513                 struct xdr_stream *xdr, void *argp)
 514 {
 515         struct cb_notify_lock_args *args = argp;
 516         __be32 status;
 517
 518         status = decode_fh(xdr, &args->cbnl_fh);
 519         if (unlikely(status != 0))
 520                 return status;
 521         return decode_lockowner(xdr, args);
 522 }
 523
 524 #endif /* CONFIG_NFS_V4_1 */
 525 #ifdef CONFIG_NFS_V4_2
 526 static __be32 decode_write_response(struct xdr_stream *xdr,
 527                                         struct cb_offloadargs *args)
 528 {
 529         __be32 *p;
 530
 531         /* skip the always zero field */
 532         p = xdr_inline_decode(xdr, 4);
 533         if (unlikely(!p))
 534                 goto out;
 535         p++;
 536
 537         /* decode count, stable_how, verifier */
 538         p = xdr_inline_decode(xdr, 8 + 4);
 539         if (unlikely(!p))
 540                 goto out;
 541         p = xdr_decode_hyper(p, &args->wr_count);
 542         args->wr_writeverf.committed = be32_to_cpup(p);
 543         p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
 544         if (likely(p)) {
 545                 memcpy(&args->wr_writeverf.verifier.data[0], p,
 546                         NFS4_VERIFIER_SIZE);
 547                 return 0;
 548         }
 549 out:
 550         return htonl(NFS4ERR_RESOURCE);
 551 }
 552
 553 static __be32 decode_offload_args(struct svc_rqst *rqstp,
 554                                         struct xdr_stream *xdr,
 555                                         void *data)
 556 {
 557         struct cb_offloadargs *args = data;
 558         __be32 *p;
 559         __be32 status;
 560
 561         /* decode fh */
 562         status = decode_fh(xdr, &args->coa_fh);
 563         if (unlikely(status != 0))
 564                 return status;
 565
 566         /* decode stateid */
 567         status = decode_stateid(xdr, &args->coa_stateid);
 568         if (unlikely(status != 0))
 569                 return status;
 570
 571         /* decode status */
 572         p = xdr_inline_decode(xdr, 4);
 573         if (unlikely(!p))
 574                 goto out;
 575         args->error = ntohl(*p++);
 576         if (!args->error) {
 577                 status = decode_write_response(xdr, args);
 578                 if (unlikely(status != 0))
 579                         return status;
 580         } else {
 581                 p = xdr_inline_decode(xdr, 8);
 582                 if (unlikely(!p))
 583                         goto out;
 584                 p = xdr_decode_hyper(p, &args->wr_count);
 585         }
 586         return 0;
 587 out:
 588         return htonl(NFS4ERR_RESOURCE);
 589 }
 590 #endif /* CONFIG_NFS_V4_2 */
 591 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
 592 {
 593         if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
 594                 return cpu_to_be32(NFS4ERR_RESOURCE);
 595         return 0;
 596 }
 597
 598 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
 599 {
 600         if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
 601                 return cpu_to_be32(NFS4ERR_RESOURCE);
 602         return 0;
 603 }
 604
 605 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
 606 {
 607         __be32 *p;
 608
 609         if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
 610                 return 0;
 611         p = xdr_reserve_space(xdr, 8);
 612         if (unlikely(!p))
 613                 return htonl(NFS4ERR_RESOURCE);
 614         p = xdr_encode_hyper(p, change);
 615         return 0;
 616 }
 617
 618 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
 619 {
 620         __be32 *p;
 621
 622         if (!(bitmap[0] & FATTR4_WORD0_SIZE))
 623                 return 0;
 624         p = xdr_reserve_space(xdr, 8);
 625         if (unlikely(!p))
 626                 return htonl(NFS4ERR_RESOURCE);
 627         p = xdr_encode_hyper(p, size);
 628         return 0;
 629 }
 630
 631 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time)
 632 {
 633         __be32 *p;
 634
 635         p = xdr_reserve_space(xdr, 12);
 636         if (unlikely(!p))
 637                 return htonl(NFS4ERR_RESOURCE);
 638         p = xdr_encode_hyper(p, time->tv_sec);
 639         *p = htonl(time->tv_nsec);
 640         return 0;
 641 }
 642
 643 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
 644 {
 645         if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
 646                 return 0;
 647         return encode_attr_time(xdr,time);
 648 }
 649
 650 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
 651 {
 652         if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
 653                 return 0;
 654         return encode_attr_time(xdr,time);
 655 }
 656
 657 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
 658 {
 659         __be32 status;
 660
 661         hdr->status = xdr_reserve_space(xdr, 4);
 662         if (unlikely(hdr->status == NULL))
 663                 return htonl(NFS4ERR_RESOURCE);
 664         status = encode_string(xdr, hdr->taglen, hdr->tag);
 665         if (unlikely(status != 0))
 666                 return status;
 667         hdr->nops = xdr_reserve_space(xdr, 4);
 668         if (unlikely(hdr->nops == NULL))
 669                 return htonl(NFS4ERR_RESOURCE);
 670         return 0;
 671 }
 672
 673 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
 674 {
 675         __be32 *p;
 676
 677         p = xdr_reserve_space(xdr, 8);
 678         if (unlikely(p == NULL))
 679                 return htonl(NFS4ERR_RESOURCE_HDR);
 680         *p++ = htonl(op);
 681         *p = res;
 682         return 0;
 683 }
 684
 685 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 686                 const void *resp)
 687 {
 688         const struct cb_getattrres *res = resp;
 689         __be32 *savep = NULL;
 690         __be32 status = res->status;
 691
 692         if (unlikely(status != 0))
 693                 goto out;
 694         status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
 695         if (unlikely(status != 0))
 696                 goto out;
 697         status = cpu_to_be32(NFS4ERR_RESOURCE);
 698         savep = xdr_reserve_space(xdr, sizeof(*savep));
 699         if (unlikely(!savep))
 700                 goto out;
 701         status = encode_attr_change(xdr, res->bitmap, res->change_attr);
 702         if (unlikely(status != 0))
 703                 goto out;
 704         status = encode_attr_size(xdr, res->bitmap, res->size);
 705         if (unlikely(status != 0))
 706                 goto out;
 707         status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
 708         if (unlikely(status != 0))
 709                 goto out;
 710         status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
 711         *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
 712 out:
 713         return status;
 714 }
 715
 716 #if defined(CONFIG_NFS_V4_1)
 717
 718 static __be32 encode_sessionid(struct xdr_stream *xdr,
 719                                  const struct nfs4_sessionid *sid)
 720 {
 721         __be32 *p;
 722
 723         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
 724         if (unlikely(p == NULL))
 725                 return htonl(NFS4ERR_RESOURCE);
 726
 727         memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
 728         return 0;
 729 }
 730
 731 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
 732                                        struct xdr_stream *xdr,
 733                                        const void *resp)
 734 {
 735         const struct cb_sequenceres *res = resp;
 736         __be32 *p;
 737         __be32 status = res->csr_status;
 738
 739         if (unlikely(status != 0))
 740                 return status;
 741
 742         status = encode_sessionid(xdr, &res->csr_sessionid);
 743         if (status)
 744                 return status;
 745
 746         p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
 747         if (unlikely(p == NULL))
 748                 return htonl(NFS4ERR_RESOURCE);
 749
 750         *p++ = htonl(res->csr_sequenceid);
 751         *p++ = htonl(res->csr_slotid);
 752         *p++ = htonl(res->csr_highestslotid);
 753         *p++ = htonl(res->csr_target_highestslotid);
 754         return 0;
 755 }
 756
 757 static __be32
 758 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
 759 {
 760         if (op_nr == OP_CB_SEQUENCE) {
 761                 if (nop != 0)
 762                         return htonl(NFS4ERR_SEQUENCE_POS);
 763         } else {
 764                 if (nop == 0)
 765                         return htonl(NFS4ERR_OP_NOT_IN_SESSION);
 766         }
 767
 768         switch (op_nr) {
 769         case OP_CB_GETATTR:
 770         case OP_CB_RECALL:
 771         case OP_CB_SEQUENCE:
 772         case OP_CB_RECALL_ANY:
 773         case OP_CB_RECALL_SLOT:
 774         case OP_CB_LAYOUTRECALL:
 775         case OP_CB_NOTIFY_DEVICEID:
 776         case OP_CB_NOTIFY_LOCK:
 777                 *op = &callback_ops[op_nr];
 778                 break;
 779
 780         case OP_CB_NOTIFY:
 781         case OP_CB_PUSH_DELEG:
 782         case OP_CB_RECALLABLE_OBJ_AVAIL:
 783         case OP_CB_WANTS_CANCELLED:
 784                 return htonl(NFS4ERR_NOTSUPP);
 785
 786         default:
 787                 return htonl(NFS4ERR_OP_ILLEGAL);
 788         }
 789
 790         return htonl(NFS_OK);
 791 }
 792
 793 static void nfs4_callback_free_slot(struct nfs4_session *session,
 794                 struct nfs4_slot *slot)
 795 {
 796         struct nfs4_slot_table *tbl = &session->bc_slot_table;
 797
 798         spin_lock(&tbl->slot_tbl_lock);
 799         /*
 800          * Let the state manager know callback processing done.
 801          * A single slot, so highest used slotid is either 0 or -1
 802          */
 803         nfs4_free_slot(tbl, slot);
 804         spin_unlock(&tbl->slot_tbl_lock);
 805 }
 806
 807 static void nfs4_cb_free_slot(struct cb_process_state *cps)
 808 {
 809         if (cps->slot) {
 810                 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
 811                 cps->slot = NULL;
 812         }
 813 }
 814
 815 #else /* CONFIG_NFS_V4_1 */
 816
 817 static __be32
 818 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
 819 {
 820         return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
 821 }
 822
 823 static void nfs4_cb_free_slot(struct cb_process_state *cps)
 824 {
 825 }
 826 #endif /* CONFIG_NFS_V4_1 */
 827
 828 #ifdef CONFIG_NFS_V4_2
 829 static __be32
 830 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
 831 {
 832         __be32 status = preprocess_nfs41_op(nop, op_nr, op);
 833         if (status != htonl(NFS4ERR_OP_ILLEGAL))
 834                 return status;
 835
 836         if (op_nr == OP_CB_OFFLOAD) {
 837                 *op = &callback_ops[op_nr];
 838                 return htonl(NFS_OK);
 839         } else
 840                 return htonl(NFS4ERR_NOTSUPP);
 841         return htonl(NFS4ERR_OP_ILLEGAL);
 842 }
 843 #else /* CONFIG_NFS_V4_2 */
 844 static __be32
 845 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
 846 {
 847         return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
 848 }
 849 #endif /* CONFIG_NFS_V4_2 */
 850
 851 static __be32
 852 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
 853 {
 854         switch (op_nr) {
 855         case OP_CB_GETATTR:
 856         case OP_CB_RECALL:
 857                 *op = &callback_ops[op_nr];
 858                 break;
 859         default:
 860                 return htonl(NFS4ERR_OP_ILLEGAL);
 861         }
 862
 863         return htonl(NFS_OK);
 864 }
 865
 866 static __be32 process_op(int nop, struct svc_rqst *rqstp,
 867                 struct xdr_stream *xdr_in, void *argp,
 868                 struct xdr_stream *xdr_out, void *resp,
 869                 struct cb_process_state *cps)
 870 {
 871         struct callback_op *op = &callback_ops[0];
 872         unsigned int op_nr;
 873         __be32 status;
 874         long maxlen;
 875         __be32 res;
 876
 877         status = decode_op_hdr(xdr_in, &op_nr);
 878         if (unlikely(status))
 879                 return status;
 880
 881         switch (cps->minorversion) {
 882         case 0:
 883                 status = preprocess_nfs4_op(op_nr, &op);
 884                 break;
 885         case 1:
 886                 status = preprocess_nfs41_op(nop, op_nr, &op);
 887                 break;
 888         case 2:
 889                 status = preprocess_nfs42_op(nop, op_nr, &op);
 890                 break;
 891         default:
 892                 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
 893         }
 894
 895         if (status == htonl(NFS4ERR_OP_ILLEGAL))
 896                 op_nr = OP_CB_ILLEGAL;
 897         if (status)
 898                 goto encode_hdr;
 899
 900         if (cps->drc_status) {
 901                 status = cps->drc_status;
 902                 goto encode_hdr;
 903         }
 904
 905         maxlen = xdr_out->end - xdr_out->p;
 906         if (maxlen > 0 && maxlen < PAGE_SIZE) {
 907                 status = op->decode_args(rqstp, xdr_in, argp);
 908                 if (likely(status == 0))
 909                         status = op->process_op(argp, resp, cps);
 910         } else
 911                 status = htonl(NFS4ERR_RESOURCE);
 912
 913 encode_hdr:
 914         res = encode_op_hdr(xdr_out, op_nr, status);
 915         if (unlikely(res))
 916                 return res;
 917         if (op->encode_res != NULL && status == 0)
 918                 status = op->encode_res(rqstp, xdr_out, resp);
 919         return status;
 920 }
 921
 922 /*
 923  * Decode, process and encode a COMPOUND
 924  */
 925 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
 926 {
 927         struct cb_compound_hdr_arg hdr_arg = { 0 };
 928         struct cb_compound_hdr_res hdr_res = { NULL };
 929         struct xdr_stream xdr_in, xdr_out;
 930         __be32 *p, status;
 931         struct cb_process_state cps = {
 932                 .drc_status = 0,
 933                 .clp = NULL,
 934                 .net = SVC_NET(rqstp),
 935         };
 936         unsigned int nops = 0;
 937
 938         xdr_init_decode(&xdr_in, &rqstp->rq_arg,
 939                         rqstp->rq_arg.head[0].iov_base, NULL);
 940
 941         p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
 942         xdr_init_encode(&xdr_out, &rqstp->rq_res, p, NULL);
 943
 944         status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
 945         if (status == htonl(NFS4ERR_RESOURCE))
 946                 return rpc_garbage_args;
 947
 948         if (hdr_arg.minorversion == 0) {
 949                 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
 950                 if (!cps.clp) {
 951                         trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident);
 952                         goto out_invalidcred;
 953                 }
 954                 if (!check_gss_callback_principal(cps.clp, rqstp)) {
 955                         trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident);
 956                         nfs_put_client(cps.clp);
 957                         goto out_invalidcred;
 958                 }
 959         }
 960
 961         cps.minorversion = hdr_arg.minorversion;
 962         hdr_res.taglen = hdr_arg.taglen;
 963         hdr_res.tag = hdr_arg.tag;
 964         if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) {
 965                 if (cps.clp)
 966                         nfs_put_client(cps.clp);
 967                 return rpc_system_err;
 968         }
 969         while (status == 0 && nops != hdr_arg.nops) {
 970                 status = process_op(nops, rqstp, &xdr_in,
 971                                     rqstp->rq_argp, &xdr_out, rqstp->rq_resp,
 972                                     &cps);
 973                 nops++;
 974         }
 975
 976         /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
 977         * resource error in cb_compound status without returning op */
 978         if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
 979                 status = htonl(NFS4ERR_RESOURCE);
 980                 nops--;
 981         }
 982
 983         *hdr_res.status = status;
 984         *hdr_res.nops = htonl(nops);
 985         nfs4_cb_free_slot(&cps);
 986         nfs_put_client(cps.clp);
 987         return rpc_success;
 988
 989 out_invalidcred:
 990         pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
 991         return svc_return_autherr(rqstp, rpc_autherr_badcred);
 992 }
 993
 994 /*
 995  * Define NFS4 callback COMPOUND ops.
 996  */
 997 static struct callback_op callback_ops[] = {
 998         [0] = {
 999                 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1000         },
1001         [OP_CB_GETATTR] = {
1002                 .process_op = nfs4_callback_getattr,
1003                 .decode_args = decode_getattr_args,
1004                 .encode_res = encode_getattr_res,
1005                 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1006         },
1007         [OP_CB_RECALL] = {
1008                 .process_op = nfs4_callback_recall,
1009                 .decode_args = decode_recall_args,
1010                 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1011         },
1012 #if defined(CONFIG_NFS_V4_1)
1013         [OP_CB_LAYOUTRECALL] = {
1014                 .process_op = nfs4_callback_layoutrecall,
1015                 .decode_args = decode_layoutrecall_args,
1016                 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1017         },
1018         [OP_CB_NOTIFY_DEVICEID] = {
1019                 .process_op = nfs4_callback_devicenotify,
1020                 .decode_args = decode_devicenotify_args,
1021                 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1022         },
1023         [OP_CB_SEQUENCE] = {
1024                 .process_op = nfs4_callback_sequence,
1025                 .decode_args = decode_cb_sequence_args,
1026                 .encode_res = encode_cb_sequence_res,
1027                 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1028         },
1029         [OP_CB_RECALL_ANY] = {
1030                 .process_op = nfs4_callback_recallany,
1031                 .decode_args = decode_recallany_args,
1032                 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1033         },
1034         [OP_CB_RECALL_SLOT] = {
1035                 .process_op = nfs4_callback_recallslot,
1036                 .decode_args = decode_recallslot_args,
1037                 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1038         },
1039         [OP_CB_NOTIFY_LOCK] = {
1040                 .process_op = nfs4_callback_notify_lock,
1041                 .decode_args = decode_notify_lock_args,
1042                 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1043         },
1044 #endif /* CONFIG_NFS_V4_1 */
1045 #ifdef CONFIG_NFS_V4_2
1046         [OP_CB_OFFLOAD] = {
1047                 .process_op = nfs4_callback_offload,
1048                 .decode_args = decode_offload_args,
1049                 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1050         },
1051 #endif /* CONFIG_NFS_V4_2 */
1052 };
1053
1054 /*
1055  * Define NFS4 callback procedures
1056  */
1057 static const struct svc_procedure nfs4_callback_procedures1[] = {
1058         [CB_NULL] = {
1059                 .pc_func = nfs4_callback_null,
1060                 .pc_decode = nfs4_decode_void,
1061                 .pc_encode = nfs4_encode_void,
1062                 .pc_xdrressize = 1,
1063         },
1064         [CB_COMPOUND] = {
1065                 .pc_func = nfs4_callback_compound,
1066                 .pc_encode = nfs4_encode_void,
1067                 .pc_argsize = 256,
1068                 .pc_ressize = 256,
1069                 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1070         }
1071 };
1072
1073 static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)];
1074 const struct svc_version nfs4_callback_version1 = {
1075         .vs_vers = 1,
1076         .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1077         .vs_proc = nfs4_callback_procedures1,
1078         .vs_count = nfs4_callback_count1,
1079         .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1080         .vs_dispatch = NULL,
1081         .vs_hidden = true,
1082         .vs_need_cong_ctrl = true,
1083 };
1084
1085 static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)];
1086 const struct svc_version nfs4_callback_version4 = {
1087         .vs_vers = 4,
1088         .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1089         .vs_proc = nfs4_callback_procedures1,
1090         .vs_count = nfs4_callback_count4,
1091         .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1092         .vs_dispatch = NULL,
1093         .vs_hidden = true,
1094         .vs_need_cong_ctrl = true,
1095 };