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;
277 /* Num of device notifications */
278 p = read_buf(xdr, sizeof(uint32_t));
279 if (unlikely(p == NULL)) {
280 status = htonl(NFS4ERR_BADXDR);
286 if (n > ULONG_MAX / sizeof(*args->devs)) {
287 status = htonl(NFS4ERR_BADXDR);
291 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
293 status = htonl(NFS4ERR_DELAY);
297 /* Decode each dev notification */
298 for (i = 0; i < n; i++) {
299 struct cb_devicenotifyitem *dev = &args->devs[i];
301 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
302 if (unlikely(p == NULL)) {
303 status = htonl(NFS4ERR_BADXDR);
307 tmp = ntohl(*p++); /* bitmap size */
309 status = htonl(NFS4ERR_INVAL);
312 dev->cbd_notify_type = ntohl(*p++);
313 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
314 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
315 status = htonl(NFS4ERR_INVAL);
319 tmp = ntohl(*p++); /* opaque size */
320 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
321 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
322 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
323 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
324 status = htonl(NFS4ERR_INVAL);
327 dev->cbd_layout_type = ntohl(*p++);
328 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
329 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
331 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
332 p = read_buf(xdr, sizeof(uint32_t));
333 if (unlikely(p == NULL)) {
334 status = htonl(NFS4ERR_BADXDR);
337 dev->cbd_immediate = ntohl(*p++);
339 dev->cbd_immediate = 0;
344 dprintk("%s: type %d layout 0x%x immediate %d\n",
345 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
349 dprintk("%s: status %d ndevs %d\n",
350 __func__, ntohl(status), args->ndevs);
357 static __be32 decode_sessionid(struct xdr_stream *xdr,
358 struct nfs4_sessionid *sid)
362 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
363 if (unlikely(p == NULL))
364 return htonl(NFS4ERR_RESOURCE);
366 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
370 static __be32 decode_rc_list(struct xdr_stream *xdr,
371 struct referring_call_list *rc_list)
377 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
381 status = htonl(NFS4ERR_RESOURCE);
382 p = read_buf(xdr, sizeof(uint32_t));
383 if (unlikely(p == NULL))
386 rc_list->rcl_nrefcalls = ntohl(*p++);
387 if (rc_list->rcl_nrefcalls) {
389 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
390 if (unlikely(p == NULL))
392 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
393 sizeof(*rc_list->rcl_refcalls),
395 if (unlikely(rc_list->rcl_refcalls == NULL))
397 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
398 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
399 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
408 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
409 struct xdr_stream *xdr,
412 struct cb_sequenceargs *args = argp;
417 status = decode_sessionid(xdr, &args->csa_sessionid);
421 p = read_buf(xdr, 5 * sizeof(uint32_t));
422 if (unlikely(p == NULL))
423 return htonl(NFS4ERR_RESOURCE);
425 args->csa_addr = svc_addr(rqstp);
426 args->csa_sequenceid = ntohl(*p++);
427 args->csa_slotid = ntohl(*p++);
428 args->csa_highestslotid = ntohl(*p++);
429 args->csa_cachethis = ntohl(*p++);
430 args->csa_nrclists = ntohl(*p++);
431 args->csa_rclists = NULL;
432 if (args->csa_nrclists) {
433 args->csa_rclists = kmalloc_array(args->csa_nrclists,
434 sizeof(*args->csa_rclists),
436 if (unlikely(args->csa_rclists == NULL))
437 return htonl(NFS4ERR_RESOURCE);
439 for (i = 0; i < args->csa_nrclists; i++) {
440 status = decode_rc_list(xdr, &args->csa_rclists[i]);
442 args->csa_nrclists = i;
450 for (i = 0; i < args->csa_nrclists; i++)
451 kfree(args->csa_rclists[i].rcl_refcalls);
452 kfree(args->csa_rclists);
456 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
457 struct xdr_stream *xdr,
460 struct cb_recallanyargs *args = argp;
464 p = read_buf(xdr, 4);
465 if (unlikely(p == NULL))
466 return htonl(NFS4ERR_BADXDR);
467 args->craa_objs_to_keep = ntohl(*p++);
468 status = decode_bitmap(xdr, bitmap);
469 if (unlikely(status))
471 args->craa_type_mask = bitmap[0];
476 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
477 struct xdr_stream *xdr,
480 struct cb_recallslotargs *args = argp;
483 p = read_buf(xdr, 4);
484 if (unlikely(p == NULL))
485 return htonl(NFS4ERR_BADXDR);
486 args->crsa_target_highest_slotid = ntohl(*p++);
490 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
495 p = read_buf(xdr, 12);
496 if (unlikely(p == NULL))
497 return htonl(NFS4ERR_BADXDR);
499 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
500 len = be32_to_cpu(*p);
502 p = read_buf(xdr, len);
503 if (unlikely(p == NULL))
504 return htonl(NFS4ERR_BADXDR);
506 /* Only try to decode if the length is right */
508 p += 2; /* skip "lock id:" */
509 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
510 xdr_decode_hyper(p, &args->cbnl_owner.id);
511 args->cbnl_valid = true;
513 args->cbnl_owner.s_dev = 0;
514 args->cbnl_owner.id = 0;
515 args->cbnl_valid = false;
520 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
521 struct xdr_stream *xdr, void *argp)
523 struct cb_notify_lock_args *args = argp;
526 status = decode_fh(xdr, &args->cbnl_fh);
527 if (unlikely(status != 0))
529 return decode_lockowner(xdr, args);
532 #endif /* CONFIG_NFS_V4_1 */
533 #ifdef CONFIG_NFS_V4_2
534 static __be32 decode_write_response(struct xdr_stream *xdr,
535 struct cb_offloadargs *args)
539 /* skip the always zero field */
540 p = read_buf(xdr, 4);
545 /* decode count, stable_how, verifier */
546 p = xdr_inline_decode(xdr, 8 + 4);
549 p = xdr_decode_hyper(p, &args->wr_count);
550 args->wr_writeverf.committed = be32_to_cpup(p);
551 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
553 memcpy(&args->wr_writeverf.verifier.data[0], p,
558 return htonl(NFS4ERR_RESOURCE);
561 static __be32 decode_offload_args(struct svc_rqst *rqstp,
562 struct xdr_stream *xdr,
565 struct cb_offloadargs *args = data;
570 status = decode_fh(xdr, &args->coa_fh);
571 if (unlikely(status != 0))
575 status = decode_stateid(xdr, &args->coa_stateid);
576 if (unlikely(status != 0))
580 p = read_buf(xdr, 4);
583 args->error = ntohl(*p++);
585 status = decode_write_response(xdr, args);
586 if (unlikely(status != 0))
589 p = xdr_inline_decode(xdr, 8);
592 p = xdr_decode_hyper(p, &args->wr_count);
596 return htonl(NFS4ERR_RESOURCE);
598 #endif /* CONFIG_NFS_V4_2 */
599 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
601 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
602 return cpu_to_be32(NFS4ERR_RESOURCE);
606 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
608 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
609 return cpu_to_be32(NFS4ERR_RESOURCE);
613 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
617 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
619 p = xdr_reserve_space(xdr, 8);
621 return htonl(NFS4ERR_RESOURCE);
622 p = xdr_encode_hyper(p, change);
626 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
630 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
632 p = xdr_reserve_space(xdr, 8);
634 return htonl(NFS4ERR_RESOURCE);
635 p = xdr_encode_hyper(p, size);
639 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
643 p = xdr_reserve_space(xdr, 12);
645 return htonl(NFS4ERR_RESOURCE);
646 p = xdr_encode_hyper(p, time->tv_sec);
647 *p = htonl(time->tv_nsec);
651 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
653 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
655 return encode_attr_time(xdr,time);
658 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
660 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
662 return encode_attr_time(xdr,time);
665 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
669 hdr->status = xdr_reserve_space(xdr, 4);
670 if (unlikely(hdr->status == NULL))
671 return htonl(NFS4ERR_RESOURCE);
672 status = encode_string(xdr, hdr->taglen, hdr->tag);
673 if (unlikely(status != 0))
675 hdr->nops = xdr_reserve_space(xdr, 4);
676 if (unlikely(hdr->nops == NULL))
677 return htonl(NFS4ERR_RESOURCE);
681 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
685 p = xdr_reserve_space(xdr, 8);
686 if (unlikely(p == NULL))
687 return htonl(NFS4ERR_RESOURCE_HDR);
693 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
696 const struct cb_getattrres *res = resp;
697 __be32 *savep = NULL;
698 __be32 status = res->status;
700 if (unlikely(status != 0))
702 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
703 if (unlikely(status != 0))
705 status = cpu_to_be32(NFS4ERR_RESOURCE);
706 savep = xdr_reserve_space(xdr, sizeof(*savep));
707 if (unlikely(!savep))
709 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
710 if (unlikely(status != 0))
712 status = encode_attr_size(xdr, res->bitmap, res->size);
713 if (unlikely(status != 0))
715 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
716 if (unlikely(status != 0))
718 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
719 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
724 #if defined(CONFIG_NFS_V4_1)
726 static __be32 encode_sessionid(struct xdr_stream *xdr,
727 const struct nfs4_sessionid *sid)
731 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
732 if (unlikely(p == NULL))
733 return htonl(NFS4ERR_RESOURCE);
735 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
739 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
740 struct xdr_stream *xdr,
743 const struct cb_sequenceres *res = resp;
745 __be32 status = res->csr_status;
747 if (unlikely(status != 0))
750 status = encode_sessionid(xdr, &res->csr_sessionid);
754 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
755 if (unlikely(p == NULL))
756 return htonl(NFS4ERR_RESOURCE);
758 *p++ = htonl(res->csr_sequenceid);
759 *p++ = htonl(res->csr_slotid);
760 *p++ = htonl(res->csr_highestslotid);
761 *p++ = htonl(res->csr_target_highestslotid);
766 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
768 if (op_nr == OP_CB_SEQUENCE) {
770 return htonl(NFS4ERR_SEQUENCE_POS);
773 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
780 case OP_CB_RECALL_ANY:
781 case OP_CB_RECALL_SLOT:
782 case OP_CB_LAYOUTRECALL:
783 case OP_CB_NOTIFY_DEVICEID:
784 case OP_CB_NOTIFY_LOCK:
785 *op = &callback_ops[op_nr];
789 case OP_CB_PUSH_DELEG:
790 case OP_CB_RECALLABLE_OBJ_AVAIL:
791 case OP_CB_WANTS_CANCELLED:
792 return htonl(NFS4ERR_NOTSUPP);
795 return htonl(NFS4ERR_OP_ILLEGAL);
798 return htonl(NFS_OK);
801 static void nfs4_callback_free_slot(struct nfs4_session *session,
802 struct nfs4_slot *slot)
804 struct nfs4_slot_table *tbl = &session->bc_slot_table;
806 spin_lock(&tbl->slot_tbl_lock);
808 * Let the state manager know callback processing done.
809 * A single slot, so highest used slotid is either 0 or -1
811 nfs4_free_slot(tbl, slot);
812 spin_unlock(&tbl->slot_tbl_lock);
815 static void nfs4_cb_free_slot(struct cb_process_state *cps)
818 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
823 #else /* CONFIG_NFS_V4_1 */
826 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
828 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
831 static void nfs4_cb_free_slot(struct cb_process_state *cps)
834 #endif /* CONFIG_NFS_V4_1 */
836 #ifdef CONFIG_NFS_V4_2
838 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
840 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
841 if (status != htonl(NFS4ERR_OP_ILLEGAL))
844 if (op_nr == OP_CB_OFFLOAD) {
845 *op = &callback_ops[op_nr];
846 return htonl(NFS_OK);
848 return htonl(NFS4ERR_NOTSUPP);
849 return htonl(NFS4ERR_OP_ILLEGAL);
851 #else /* CONFIG_NFS_V4_2 */
853 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
855 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
857 #endif /* CONFIG_NFS_V4_2 */
860 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
865 *op = &callback_ops[op_nr];
868 return htonl(NFS4ERR_OP_ILLEGAL);
871 return htonl(NFS_OK);
874 static __be32 process_op(int nop, struct svc_rqst *rqstp,
875 struct xdr_stream *xdr_in, void *argp,
876 struct xdr_stream *xdr_out, void *resp,
877 struct cb_process_state *cps)
879 struct callback_op *op = &callback_ops[0];
885 status = decode_op_hdr(xdr_in, &op_nr);
886 if (unlikely(status))
889 switch (cps->minorversion) {
891 status = preprocess_nfs4_op(op_nr, &op);
894 status = preprocess_nfs41_op(nop, op_nr, &op);
897 status = preprocess_nfs42_op(nop, op_nr, &op);
900 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
903 if (status == htonl(NFS4ERR_OP_ILLEGAL))
904 op_nr = OP_CB_ILLEGAL;
908 if (cps->drc_status) {
909 status = cps->drc_status;
913 maxlen = xdr_out->end - xdr_out->p;
914 if (maxlen > 0 && maxlen < PAGE_SIZE) {
915 status = op->decode_args(rqstp, xdr_in, argp);
916 if (likely(status == 0))
917 status = op->process_op(argp, resp, cps);
919 status = htonl(NFS4ERR_RESOURCE);
922 res = encode_op_hdr(xdr_out, op_nr, status);
925 if (op->encode_res != NULL && status == 0)
926 status = op->encode_res(rqstp, xdr_out, resp);
931 * Decode, process and encode a COMPOUND
933 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
935 struct cb_compound_hdr_arg hdr_arg = { 0 };
936 struct cb_compound_hdr_res hdr_res = { NULL };
937 struct xdr_stream xdr_in, xdr_out;
939 struct cb_process_state cps = {
942 .net = SVC_NET(rqstp),
944 unsigned int nops = 0;
946 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
948 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
949 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
951 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
952 if (status == htonl(NFS4ERR_RESOURCE))
953 return rpc_garbage_args;
955 if (hdr_arg.minorversion == 0) {
956 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
957 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) {
959 nfs_put_client(cps.clp);
960 goto out_invalidcred;
964 cps.minorversion = hdr_arg.minorversion;
965 hdr_res.taglen = hdr_arg.taglen;
966 hdr_res.tag = hdr_arg.tag;
967 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) {
969 nfs_put_client(cps.clp);
970 return rpc_system_err;
972 while (status == 0 && nops != hdr_arg.nops) {
973 status = process_op(nops, rqstp, &xdr_in,
974 rqstp->rq_argp, &xdr_out, rqstp->rq_resp,
979 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
980 * resource error in cb_compound status without returning op */
981 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
982 status = htonl(NFS4ERR_RESOURCE);
986 *hdr_res.status = status;
987 *hdr_res.nops = htonl(nops);
988 nfs4_cb_free_slot(&cps);
989 nfs_put_client(cps.clp);
993 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
994 return rpc_autherr_badcred;
998 * Define NFS4 callback COMPOUND ops.
1000 static struct callback_op callback_ops[] = {
1002 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1005 .process_op = nfs4_callback_getattr,
1006 .decode_args = decode_getattr_args,
1007 .encode_res = encode_getattr_res,
1008 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1011 .process_op = nfs4_callback_recall,
1012 .decode_args = decode_recall_args,
1013 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1015 #if defined(CONFIG_NFS_V4_1)
1016 [OP_CB_LAYOUTRECALL] = {
1017 .process_op = nfs4_callback_layoutrecall,
1018 .decode_args = decode_layoutrecall_args,
1019 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1021 [OP_CB_NOTIFY_DEVICEID] = {
1022 .process_op = nfs4_callback_devicenotify,
1023 .decode_args = decode_devicenotify_args,
1024 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1026 [OP_CB_SEQUENCE] = {
1027 .process_op = nfs4_callback_sequence,
1028 .decode_args = decode_cb_sequence_args,
1029 .encode_res = encode_cb_sequence_res,
1030 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1032 [OP_CB_RECALL_ANY] = {
1033 .process_op = nfs4_callback_recallany,
1034 .decode_args = decode_recallany_args,
1035 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1037 [OP_CB_RECALL_SLOT] = {
1038 .process_op = nfs4_callback_recallslot,
1039 .decode_args = decode_recallslot_args,
1040 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1042 [OP_CB_NOTIFY_LOCK] = {
1043 .process_op = nfs4_callback_notify_lock,
1044 .decode_args = decode_notify_lock_args,
1045 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1047 #endif /* CONFIG_NFS_V4_1 */
1048 #ifdef CONFIG_NFS_V4_2
1050 .process_op = nfs4_callback_offload,
1051 .decode_args = decode_offload_args,
1052 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1054 #endif /* CONFIG_NFS_V4_2 */
1058 * Define NFS4 callback procedures
1060 static const struct svc_procedure nfs4_callback_procedures1[] = {
1062 .pc_func = nfs4_callback_null,
1063 .pc_decode = nfs4_decode_void,
1064 .pc_encode = nfs4_encode_void,
1068 .pc_func = nfs4_callback_compound,
1069 .pc_encode = nfs4_encode_void,
1072 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1076 static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)];
1077 const struct svc_version nfs4_callback_version1 = {
1079 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1080 .vs_proc = nfs4_callback_procedures1,
1081 .vs_count = nfs4_callback_count1,
1082 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1083 .vs_dispatch = NULL,
1085 .vs_need_cong_ctrl = true,
1088 static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)];
1089 const struct svc_version nfs4_callback_version4 = {
1091 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1092 .vs_proc = nfs4_callback_procedures1,
1093 .vs_count = nfs4_callback_count4,
1094 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1095 .vs_dispatch = NULL,
1097 .vs_need_cong_ctrl = true,