1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/nfs/callback_xdr.c
5 * Copyright (C) 2004 Trond Myklebust
7 * NFSv4 callback encode/decode procedures
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>
20 #include "nfs4session.h"
22 #define CB_OP_TAGLEN_MAXSZ (512)
23 #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
24 #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
25 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
26 CB_OP_GETATTR_BITMAP_MAXSZ + \
27 /* change, size, ctime, mtime */\
29 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
31 #if defined(CONFIG_NFS_V4_1)
32 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
33 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
34 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
35 NFS4_MAX_SESSIONID_LEN + \
36 (1 + 3) * 4) // seqid, 3 slotids
37 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
38 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
39 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
40 #endif /* CONFIG_NFS_V4_1 */
41 #ifdef CONFIG_NFS_V4_2
42 #define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
43 #endif /* CONFIG_NFS_V4_2 */
45 #define NFSDBG_FACILITY NFSDBG_CALLBACK
47 /* Internal error code */
48 #define NFS4ERR_RESOURCE_HDR 11050
51 __be32 (*process_op)(void *, void *, struct cb_process_state *);
52 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
53 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
58 static struct callback_op callback_ops[];
60 static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
62 return htonl(NFS4_OK);
65 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p)
67 return xdr_argsize_check(rqstp, p);
70 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p)
72 return xdr_ressize_check(rqstp, p);
75 static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes)
79 p = xdr_inline_decode(xdr, nbytes);
80 if (unlikely(p == NULL))
81 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
85 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
86 const char **str, size_t maxlen)
90 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
92 return cpu_to_be32(NFS4ERR_RESOURCE);
97 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
101 p = read_buf(xdr, 4);
102 if (unlikely(p == NULL))
103 return htonl(NFS4ERR_RESOURCE);
104 fh->size = ntohl(*p);
105 if (fh->size > NFS4_FHSIZE)
106 return htonl(NFS4ERR_BADHANDLE);
107 p = read_buf(xdr, fh->size);
108 if (unlikely(p == NULL))
109 return htonl(NFS4ERR_RESOURCE);
110 memcpy(&fh->data[0], p, fh->size);
111 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
115 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
118 unsigned int attrlen;
120 p = read_buf(xdr, 4);
121 if (unlikely(p == NULL))
122 return htonl(NFS4ERR_RESOURCE);
124 p = read_buf(xdr, attrlen << 2);
125 if (unlikely(p == NULL))
126 return htonl(NFS4ERR_RESOURCE);
127 if (likely(attrlen > 0))
128 bitmap[0] = ntohl(*p++);
130 bitmap[1] = ntohl(*p);
134 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
138 p = read_buf(xdr, NFS4_STATEID_SIZE);
139 if (unlikely(p == NULL))
140 return htonl(NFS4ERR_RESOURCE);
141 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
145 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
147 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
148 return decode_stateid(xdr, stateid);
151 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
156 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
157 if (unlikely(status != 0))
159 p = read_buf(xdr, 12);
160 if (unlikely(p == NULL))
161 return htonl(NFS4ERR_RESOURCE);
162 hdr->minorversion = ntohl(*p++);
163 /* Check for minor version support */
164 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
165 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
167 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
168 "illegal minor version %u!\n",
169 __func__, hdr->minorversion);
170 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
172 hdr->nops = ntohl(*p);
176 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
179 p = read_buf(xdr, 4);
180 if (unlikely(p == NULL))
181 return htonl(NFS4ERR_RESOURCE_HDR);
186 static __be32 decode_getattr_args(struct svc_rqst *rqstp,
187 struct xdr_stream *xdr, void *argp)
189 struct cb_getattrargs *args = argp;
192 status = decode_fh(xdr, &args->fh);
193 if (unlikely(status != 0))
195 return decode_bitmap(xdr, args->bitmap);
198 static __be32 decode_recall_args(struct svc_rqst *rqstp,
199 struct xdr_stream *xdr, void *argp)
201 struct cb_recallargs *args = argp;
205 status = decode_delegation_stateid(xdr, &args->stateid);
206 if (unlikely(status != 0))
208 p = read_buf(xdr, 4);
209 if (unlikely(p == NULL))
210 return htonl(NFS4ERR_RESOURCE);
211 args->truncate = ntohl(*p);
212 return decode_fh(xdr, &args->fh);
215 #if defined(CONFIG_NFS_V4_1)
216 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
218 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
219 return decode_stateid(xdr, stateid);
222 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
223 struct xdr_stream *xdr, void *argp)
225 struct cb_layoutrecallargs *args = argp;
230 p = read_buf(xdr, 4 * sizeof(uint32_t));
231 if (unlikely(p == NULL))
232 return htonl(NFS4ERR_BADXDR);
234 args->cbl_layout_type = ntohl(*p++);
235 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
236 * as it is unusable and ignored with the other types.
238 iomode = ntohl(*p++);
239 args->cbl_layoutchanged = ntohl(*p++);
240 args->cbl_recall_type = ntohl(*p++);
242 if (args->cbl_recall_type == RETURN_FILE) {
243 args->cbl_range.iomode = iomode;
244 status = decode_fh(xdr, &args->cbl_fh);
245 if (unlikely(status != 0))
248 p = read_buf(xdr, 2 * sizeof(uint64_t));
249 if (unlikely(p == NULL))
250 return htonl(NFS4ERR_BADXDR);
251 p = xdr_decode_hyper(p, &args->cbl_range.offset);
252 p = xdr_decode_hyper(p, &args->cbl_range.length);
253 return decode_layout_stateid(xdr, &args->cbl_stateid);
254 } else if (args->cbl_recall_type == RETURN_FSID) {
255 p = read_buf(xdr, 2 * sizeof(uint64_t));
256 if (unlikely(p == NULL))
257 return htonl(NFS4ERR_BADXDR);
258 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
259 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
260 } else if (args->cbl_recall_type != RETURN_ALL)
261 return htonl(NFS4ERR_BADXDR);
266 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
267 struct xdr_stream *xdr,
270 struct cb_devicenotifyargs *args = argp;
275 /* Num of device notifications */
276 p = read_buf(xdr, sizeof(uint32_t));
277 if (unlikely(p == NULL)) {
278 status = htonl(NFS4ERR_BADXDR);
285 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
287 status = htonl(NFS4ERR_DELAY);
291 /* Decode each dev notification */
292 for (i = 0; i < n; i++) {
293 struct cb_devicenotifyitem *dev = &args->devs[i];
295 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
296 if (unlikely(p == NULL)) {
297 status = htonl(NFS4ERR_BADXDR);
301 tmp = ntohl(*p++); /* bitmap size */
303 status = htonl(NFS4ERR_INVAL);
306 dev->cbd_notify_type = ntohl(*p++);
307 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
308 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
309 status = htonl(NFS4ERR_INVAL);
313 tmp = ntohl(*p++); /* opaque size */
314 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
315 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
316 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
317 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
318 status = htonl(NFS4ERR_INVAL);
321 dev->cbd_layout_type = ntohl(*p++);
322 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
323 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
325 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
326 p = read_buf(xdr, sizeof(uint32_t));
327 if (unlikely(p == NULL)) {
328 status = htonl(NFS4ERR_BADXDR);
331 dev->cbd_immediate = ntohl(*p++);
333 dev->cbd_immediate = 0;
336 dprintk("%s: type %d layout 0x%x immediate %d\n",
337 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
341 dprintk("%s: ndevs %d\n", __func__, args->ndevs);
348 dprintk("%s: status %d ndevs %d\n",
349 __func__, ntohl(status), args->ndevs);
353 static __be32 decode_sessionid(struct xdr_stream *xdr,
354 struct nfs4_sessionid *sid)
358 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
359 if (unlikely(p == NULL))
360 return htonl(NFS4ERR_RESOURCE);
362 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
366 static __be32 decode_rc_list(struct xdr_stream *xdr,
367 struct referring_call_list *rc_list)
373 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
377 status = htonl(NFS4ERR_RESOURCE);
378 p = read_buf(xdr, sizeof(uint32_t));
379 if (unlikely(p == NULL))
382 rc_list->rcl_nrefcalls = ntohl(*p++);
383 if (rc_list->rcl_nrefcalls) {
385 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
386 if (unlikely(p == NULL))
388 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
389 sizeof(*rc_list->rcl_refcalls),
391 if (unlikely(rc_list->rcl_refcalls == NULL))
393 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
394 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
395 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
404 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
405 struct xdr_stream *xdr,
408 struct cb_sequenceargs *args = argp;
413 status = decode_sessionid(xdr, &args->csa_sessionid);
417 p = read_buf(xdr, 5 * sizeof(uint32_t));
418 if (unlikely(p == NULL))
419 return htonl(NFS4ERR_RESOURCE);
421 args->csa_addr = svc_addr(rqstp);
422 args->csa_sequenceid = ntohl(*p++);
423 args->csa_slotid = ntohl(*p++);
424 args->csa_highestslotid = ntohl(*p++);
425 args->csa_cachethis = ntohl(*p++);
426 args->csa_nrclists = ntohl(*p++);
427 args->csa_rclists = NULL;
428 if (args->csa_nrclists) {
429 args->csa_rclists = kmalloc_array(args->csa_nrclists,
430 sizeof(*args->csa_rclists),
432 if (unlikely(args->csa_rclists == NULL))
433 return htonl(NFS4ERR_RESOURCE);
435 for (i = 0; i < args->csa_nrclists; i++) {
436 status = decode_rc_list(xdr, &args->csa_rclists[i]);
438 args->csa_nrclists = i;
446 for (i = 0; i < args->csa_nrclists; i++)
447 kfree(args->csa_rclists[i].rcl_refcalls);
448 kfree(args->csa_rclists);
452 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
453 struct xdr_stream *xdr,
456 struct cb_recallanyargs *args = argp;
460 p = read_buf(xdr, 4);
461 if (unlikely(p == NULL))
462 return htonl(NFS4ERR_BADXDR);
463 args->craa_objs_to_keep = ntohl(*p++);
464 status = decode_bitmap(xdr, bitmap);
465 if (unlikely(status))
467 args->craa_type_mask = bitmap[0];
472 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
473 struct xdr_stream *xdr,
476 struct cb_recallslotargs *args = argp;
479 p = read_buf(xdr, 4);
480 if (unlikely(p == NULL))
481 return htonl(NFS4ERR_BADXDR);
482 args->crsa_target_highest_slotid = ntohl(*p++);
486 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
491 p = read_buf(xdr, 12);
492 if (unlikely(p == NULL))
493 return htonl(NFS4ERR_BADXDR);
495 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
496 len = be32_to_cpu(*p);
498 p = read_buf(xdr, len);
499 if (unlikely(p == NULL))
500 return htonl(NFS4ERR_BADXDR);
502 /* Only try to decode if the length is right */
504 p += 2; /* skip "lock id:" */
505 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
506 xdr_decode_hyper(p, &args->cbnl_owner.id);
507 args->cbnl_valid = true;
509 args->cbnl_owner.s_dev = 0;
510 args->cbnl_owner.id = 0;
511 args->cbnl_valid = false;
516 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
517 struct xdr_stream *xdr, void *argp)
519 struct cb_notify_lock_args *args = argp;
522 status = decode_fh(xdr, &args->cbnl_fh);
523 if (unlikely(status != 0))
525 return decode_lockowner(xdr, args);
528 #endif /* CONFIG_NFS_V4_1 */
529 #ifdef CONFIG_NFS_V4_2
530 static __be32 decode_write_response(struct xdr_stream *xdr,
531 struct cb_offloadargs *args)
535 /* skip the always zero field */
536 p = read_buf(xdr, 4);
541 /* decode count, stable_how, verifier */
542 p = xdr_inline_decode(xdr, 8 + 4);
545 p = xdr_decode_hyper(p, &args->wr_count);
546 args->wr_writeverf.committed = be32_to_cpup(p);
547 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
549 memcpy(&args->wr_writeverf.verifier.data[0], p,
554 return htonl(NFS4ERR_RESOURCE);
557 static __be32 decode_offload_args(struct svc_rqst *rqstp,
558 struct xdr_stream *xdr,
561 struct cb_offloadargs *args = data;
566 status = decode_fh(xdr, &args->coa_fh);
567 if (unlikely(status != 0))
571 status = decode_stateid(xdr, &args->coa_stateid);
572 if (unlikely(status != 0))
576 p = read_buf(xdr, 4);
579 args->error = ntohl(*p++);
581 status = decode_write_response(xdr, args);
582 if (unlikely(status != 0))
585 p = xdr_inline_decode(xdr, 8);
588 p = xdr_decode_hyper(p, &args->wr_count);
592 return htonl(NFS4ERR_RESOURCE);
594 #endif /* CONFIG_NFS_V4_2 */
595 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
597 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
598 return cpu_to_be32(NFS4ERR_RESOURCE);
602 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
604 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
605 return cpu_to_be32(NFS4ERR_RESOURCE);
609 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
613 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
615 p = xdr_reserve_space(xdr, 8);
617 return htonl(NFS4ERR_RESOURCE);
618 p = xdr_encode_hyper(p, change);
622 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
626 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
628 p = xdr_reserve_space(xdr, 8);
630 return htonl(NFS4ERR_RESOURCE);
631 p = xdr_encode_hyper(p, size);
635 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
639 p = xdr_reserve_space(xdr, 12);
641 return htonl(NFS4ERR_RESOURCE);
642 p = xdr_encode_hyper(p, time->tv_sec);
643 *p = htonl(time->tv_nsec);
647 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
649 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
651 return encode_attr_time(xdr,time);
654 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
656 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
658 return encode_attr_time(xdr,time);
661 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
665 hdr->status = xdr_reserve_space(xdr, 4);
666 if (unlikely(hdr->status == NULL))
667 return htonl(NFS4ERR_RESOURCE);
668 status = encode_string(xdr, hdr->taglen, hdr->tag);
669 if (unlikely(status != 0))
671 hdr->nops = xdr_reserve_space(xdr, 4);
672 if (unlikely(hdr->nops == NULL))
673 return htonl(NFS4ERR_RESOURCE);
677 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
681 p = xdr_reserve_space(xdr, 8);
682 if (unlikely(p == NULL))
683 return htonl(NFS4ERR_RESOURCE_HDR);
689 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
692 const struct cb_getattrres *res = resp;
693 __be32 *savep = NULL;
694 __be32 status = res->status;
696 if (unlikely(status != 0))
698 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
699 if (unlikely(status != 0))
701 status = cpu_to_be32(NFS4ERR_RESOURCE);
702 savep = xdr_reserve_space(xdr, sizeof(*savep));
703 if (unlikely(!savep))
705 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
706 if (unlikely(status != 0))
708 status = encode_attr_size(xdr, res->bitmap, res->size);
709 if (unlikely(status != 0))
711 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
712 if (unlikely(status != 0))
714 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
715 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
720 #if defined(CONFIG_NFS_V4_1)
722 static __be32 encode_sessionid(struct xdr_stream *xdr,
723 const struct nfs4_sessionid *sid)
727 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
728 if (unlikely(p == NULL))
729 return htonl(NFS4ERR_RESOURCE);
731 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
735 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
736 struct xdr_stream *xdr,
739 const struct cb_sequenceres *res = resp;
741 __be32 status = res->csr_status;
743 if (unlikely(status != 0))
746 status = encode_sessionid(xdr, &res->csr_sessionid);
750 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
751 if (unlikely(p == NULL))
752 return htonl(NFS4ERR_RESOURCE);
754 *p++ = htonl(res->csr_sequenceid);
755 *p++ = htonl(res->csr_slotid);
756 *p++ = htonl(res->csr_highestslotid);
757 *p++ = htonl(res->csr_target_highestslotid);
762 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
764 if (op_nr == OP_CB_SEQUENCE) {
766 return htonl(NFS4ERR_SEQUENCE_POS);
769 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
776 case OP_CB_RECALL_ANY:
777 case OP_CB_RECALL_SLOT:
778 case OP_CB_LAYOUTRECALL:
779 case OP_CB_NOTIFY_DEVICEID:
780 case OP_CB_NOTIFY_LOCK:
781 *op = &callback_ops[op_nr];
785 case OP_CB_PUSH_DELEG:
786 case OP_CB_RECALLABLE_OBJ_AVAIL:
787 case OP_CB_WANTS_CANCELLED:
788 return htonl(NFS4ERR_NOTSUPP);
791 return htonl(NFS4ERR_OP_ILLEGAL);
794 return htonl(NFS_OK);
797 static void nfs4_callback_free_slot(struct nfs4_session *session,
798 struct nfs4_slot *slot)
800 struct nfs4_slot_table *tbl = &session->bc_slot_table;
802 spin_lock(&tbl->slot_tbl_lock);
804 * Let the state manager know callback processing done.
805 * A single slot, so highest used slotid is either 0 or -1
807 nfs4_free_slot(tbl, slot);
808 spin_unlock(&tbl->slot_tbl_lock);
811 static void nfs4_cb_free_slot(struct cb_process_state *cps)
814 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
819 #else /* CONFIG_NFS_V4_1 */
822 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
824 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
827 static void nfs4_cb_free_slot(struct cb_process_state *cps)
830 #endif /* CONFIG_NFS_V4_1 */
832 #ifdef CONFIG_NFS_V4_2
834 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
836 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
837 if (status != htonl(NFS4ERR_OP_ILLEGAL))
840 if (op_nr == OP_CB_OFFLOAD) {
841 *op = &callback_ops[op_nr];
842 return htonl(NFS_OK);
844 return htonl(NFS4ERR_NOTSUPP);
845 return htonl(NFS4ERR_OP_ILLEGAL);
847 #else /* CONFIG_NFS_V4_2 */
849 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
851 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
853 #endif /* CONFIG_NFS_V4_2 */
856 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
861 *op = &callback_ops[op_nr];
864 return htonl(NFS4ERR_OP_ILLEGAL);
867 return htonl(NFS_OK);
870 static __be32 process_op(int nop, struct svc_rqst *rqstp,
871 struct xdr_stream *xdr_in, void *argp,
872 struct xdr_stream *xdr_out, void *resp,
873 struct cb_process_state *cps)
875 struct callback_op *op = &callback_ops[0];
881 status = decode_op_hdr(xdr_in, &op_nr);
882 if (unlikely(status))
885 switch (cps->minorversion) {
887 status = preprocess_nfs4_op(op_nr, &op);
890 status = preprocess_nfs41_op(nop, op_nr, &op);
893 status = preprocess_nfs42_op(nop, op_nr, &op);
896 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
899 if (status == htonl(NFS4ERR_OP_ILLEGAL))
900 op_nr = OP_CB_ILLEGAL;
904 if (cps->drc_status) {
905 status = cps->drc_status;
909 maxlen = xdr_out->end - xdr_out->p;
910 if (maxlen > 0 && maxlen < PAGE_SIZE) {
911 status = op->decode_args(rqstp, xdr_in, argp);
912 if (likely(status == 0))
913 status = op->process_op(argp, resp, cps);
915 status = htonl(NFS4ERR_RESOURCE);
918 res = encode_op_hdr(xdr_out, op_nr, status);
921 if (op->encode_res != NULL && status == 0)
922 status = op->encode_res(rqstp, xdr_out, resp);
927 * Decode, process and encode a COMPOUND
929 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
931 struct cb_compound_hdr_arg hdr_arg = { 0 };
932 struct cb_compound_hdr_res hdr_res = { NULL };
933 struct xdr_stream xdr_in, xdr_out;
935 struct cb_process_state cps = {
938 .net = SVC_NET(rqstp),
940 unsigned int nops = 0;
942 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
944 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
945 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
947 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
948 if (status == htonl(NFS4ERR_RESOURCE))
949 return rpc_garbage_args;
951 if (hdr_arg.minorversion == 0) {
952 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
953 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) {
955 nfs_put_client(cps.clp);
956 goto out_invalidcred;
960 cps.minorversion = hdr_arg.minorversion;
961 hdr_res.taglen = hdr_arg.taglen;
962 hdr_res.tag = hdr_arg.tag;
963 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) {
965 nfs_put_client(cps.clp);
966 return rpc_system_err;
968 while (status == 0 && nops != hdr_arg.nops) {
969 status = process_op(nops, rqstp, &xdr_in,
970 rqstp->rq_argp, &xdr_out, rqstp->rq_resp,
975 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
976 * resource error in cb_compound status without returning op */
977 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
978 status = htonl(NFS4ERR_RESOURCE);
982 *hdr_res.status = status;
983 *hdr_res.nops = htonl(nops);
984 nfs4_cb_free_slot(&cps);
985 nfs_put_client(cps.clp);
989 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
990 return svc_return_autherr(rqstp, rpc_autherr_badcred);
994 * Define NFS4 callback COMPOUND ops.
996 static struct callback_op callback_ops[] = {
998 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1001 .process_op = nfs4_callback_getattr,
1002 .decode_args = decode_getattr_args,
1003 .encode_res = encode_getattr_res,
1004 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1007 .process_op = nfs4_callback_recall,
1008 .decode_args = decode_recall_args,
1009 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1011 #if defined(CONFIG_NFS_V4_1)
1012 [OP_CB_LAYOUTRECALL] = {
1013 .process_op = nfs4_callback_layoutrecall,
1014 .decode_args = decode_layoutrecall_args,
1015 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1017 [OP_CB_NOTIFY_DEVICEID] = {
1018 .process_op = nfs4_callback_devicenotify,
1019 .decode_args = decode_devicenotify_args,
1020 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1022 [OP_CB_SEQUENCE] = {
1023 .process_op = nfs4_callback_sequence,
1024 .decode_args = decode_cb_sequence_args,
1025 .encode_res = encode_cb_sequence_res,
1026 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1028 [OP_CB_RECALL_ANY] = {
1029 .process_op = nfs4_callback_recallany,
1030 .decode_args = decode_recallany_args,
1031 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1033 [OP_CB_RECALL_SLOT] = {
1034 .process_op = nfs4_callback_recallslot,
1035 .decode_args = decode_recallslot_args,
1036 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1038 [OP_CB_NOTIFY_LOCK] = {
1039 .process_op = nfs4_callback_notify_lock,
1040 .decode_args = decode_notify_lock_args,
1041 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1043 #endif /* CONFIG_NFS_V4_1 */
1044 #ifdef CONFIG_NFS_V4_2
1046 .process_op = nfs4_callback_offload,
1047 .decode_args = decode_offload_args,
1048 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1050 #endif /* CONFIG_NFS_V4_2 */
1054 * Define NFS4 callback procedures
1056 static const struct svc_procedure nfs4_callback_procedures1[] = {
1058 .pc_func = nfs4_callback_null,
1059 .pc_decode = nfs4_decode_void,
1060 .pc_encode = nfs4_encode_void,
1064 .pc_func = nfs4_callback_compound,
1065 .pc_encode = nfs4_encode_void,
1068 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1072 static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)];
1073 const struct svc_version nfs4_callback_version1 = {
1075 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1076 .vs_proc = nfs4_callback_procedures1,
1077 .vs_count = nfs4_callback_count1,
1078 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1079 .vs_dispatch = NULL,
1081 .vs_need_cong_ctrl = true,
1084 static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)];
1085 const struct svc_version nfs4_callback_version4 = {
1087 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1088 .vs_proc = nfs4_callback_procedures1,
1089 .vs_count = nfs4_callback_count4,
1090 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1091 .vs_dispatch = NULL,
1093 .vs_need_cong_ctrl = true,