2 * linux/fs/nfs/callback_xdr.c
4 * Copyright (C) 2004 Trond Myklebust
6 * NFSv4 callback encode/decode procedures
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>
19 #include "nfs4session.h"
21 #define CB_OP_TAGLEN_MAXSZ (512)
22 #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
23 #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
24 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
25 CB_OP_GETATTR_BITMAP_MAXSZ + \
26 /* change, size, ctime, mtime */\
28 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
30 #if defined(CONFIG_NFS_V4_1)
31 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
32 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
33 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
34 NFS4_MAX_SESSIONID_LEN + \
35 (1 + 3) * 4) // seqid, 3 slotids
36 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
37 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
38 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
39 #endif /* CONFIG_NFS_V4_1 */
41 #define NFSDBG_FACILITY NFSDBG_CALLBACK
43 /* Internal error code */
44 #define NFS4ERR_RESOURCE_HDR 11050
46 typedef __be32 (*callback_process_op_t)(void *, void *,
47 struct cb_process_state *);
48 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
49 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
53 callback_process_op_t process_op;
54 callback_decode_arg_t decode_args;
55 callback_encode_res_t encode_res;
59 static struct callback_op callback_ops[];
61 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
63 return htonl(NFS4_OK);
66 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
68 return xdr_argsize_check(rqstp, p);
71 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
73 return xdr_ressize_check(rqstp, p);
76 static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes)
80 p = xdr_inline_decode(xdr, nbytes);
81 if (unlikely(p == NULL))
82 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
86 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
87 const char **str, size_t maxlen)
91 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
93 return cpu_to_be32(NFS4ERR_RESOURCE);
98 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
102 p = read_buf(xdr, 4);
103 if (unlikely(p == NULL))
104 return htonl(NFS4ERR_RESOURCE);
105 fh->size = ntohl(*p);
106 if (fh->size > NFS4_FHSIZE)
107 return htonl(NFS4ERR_BADHANDLE);
108 p = read_buf(xdr, fh->size);
109 if (unlikely(p == NULL))
110 return htonl(NFS4ERR_RESOURCE);
111 memcpy(&fh->data[0], p, fh->size);
112 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
116 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
119 unsigned int attrlen;
121 p = read_buf(xdr, 4);
122 if (unlikely(p == NULL))
123 return htonl(NFS4ERR_RESOURCE);
125 p = read_buf(xdr, attrlen << 2);
126 if (unlikely(p == NULL))
127 return htonl(NFS4ERR_RESOURCE);
128 if (likely(attrlen > 0))
129 bitmap[0] = ntohl(*p++);
131 bitmap[1] = ntohl(*p);
135 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
139 p = read_buf(xdr, NFS4_STATEID_SIZE);
140 if (unlikely(p == NULL))
141 return htonl(NFS4ERR_RESOURCE);
142 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
146 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
148 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
149 return decode_stateid(xdr, stateid);
152 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
157 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
158 if (unlikely(status != 0))
160 p = read_buf(xdr, 12);
161 if (unlikely(p == NULL))
162 return htonl(NFS4ERR_RESOURCE);
163 hdr->minorversion = ntohl(*p++);
164 /* Check for minor version support */
165 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
166 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
168 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
169 "illegal minor version %u!\n",
170 __func__, hdr->minorversion);
171 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
173 hdr->nops = ntohl(*p);
177 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
180 p = read_buf(xdr, 4);
181 if (unlikely(p == NULL))
182 return htonl(NFS4ERR_RESOURCE_HDR);
187 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
191 status = decode_fh(xdr, &args->fh);
192 if (unlikely(status != 0))
194 return decode_bitmap(xdr, args->bitmap);
197 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
202 status = decode_delegation_stateid(xdr, &args->stateid);
203 if (unlikely(status != 0))
205 p = read_buf(xdr, 4);
206 if (unlikely(p == NULL))
207 return htonl(NFS4ERR_RESOURCE);
208 args->truncate = ntohl(*p);
209 return decode_fh(xdr, &args->fh);
212 #if defined(CONFIG_NFS_V4_1)
213 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
215 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
216 return decode_stateid(xdr, stateid);
219 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
220 struct xdr_stream *xdr,
221 struct cb_layoutrecallargs *args)
227 p = read_buf(xdr, 4 * sizeof(uint32_t));
228 if (unlikely(p == NULL))
229 return htonl(NFS4ERR_BADXDR);
231 args->cbl_layout_type = ntohl(*p++);
232 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
233 * as it is unusable and ignored with the other types.
235 iomode = ntohl(*p++);
236 args->cbl_layoutchanged = ntohl(*p++);
237 args->cbl_recall_type = ntohl(*p++);
239 if (args->cbl_recall_type == RETURN_FILE) {
240 args->cbl_range.iomode = iomode;
241 status = decode_fh(xdr, &args->cbl_fh);
242 if (unlikely(status != 0))
245 p = read_buf(xdr, 2 * sizeof(uint64_t));
246 if (unlikely(p == NULL))
247 return htonl(NFS4ERR_BADXDR);
248 p = xdr_decode_hyper(p, &args->cbl_range.offset);
249 p = xdr_decode_hyper(p, &args->cbl_range.length);
250 return decode_layout_stateid(xdr, &args->cbl_stateid);
251 } else if (args->cbl_recall_type == RETURN_FSID) {
252 p = read_buf(xdr, 2 * sizeof(uint64_t));
253 if (unlikely(p == NULL))
254 return htonl(NFS4ERR_BADXDR);
255 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
256 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
257 } else if (args->cbl_recall_type != RETURN_ALL)
258 return htonl(NFS4ERR_BADXDR);
263 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
264 struct xdr_stream *xdr,
265 struct cb_devicenotifyargs *args)
273 /* Num of device notifications */
274 p = read_buf(xdr, sizeof(uint32_t));
275 if (unlikely(p == NULL)) {
276 status = htonl(NFS4ERR_BADXDR);
282 if (n > ULONG_MAX / sizeof(*args->devs)) {
283 status = htonl(NFS4ERR_BADXDR);
287 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
289 status = htonl(NFS4ERR_DELAY);
293 /* Decode each dev notification */
294 for (i = 0; i < n; i++) {
295 struct cb_devicenotifyitem *dev = &args->devs[i];
297 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
298 if (unlikely(p == NULL)) {
299 status = htonl(NFS4ERR_BADXDR);
303 tmp = ntohl(*p++); /* bitmap size */
305 status = htonl(NFS4ERR_INVAL);
308 dev->cbd_notify_type = ntohl(*p++);
309 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
310 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
311 status = htonl(NFS4ERR_INVAL);
315 tmp = ntohl(*p++); /* opaque size */
316 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
317 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
318 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
319 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
320 status = htonl(NFS4ERR_INVAL);
323 dev->cbd_layout_type = ntohl(*p++);
324 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
325 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
327 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
328 p = read_buf(xdr, sizeof(uint32_t));
329 if (unlikely(p == NULL)) {
330 status = htonl(NFS4ERR_BADXDR);
333 dev->cbd_immediate = ntohl(*p++);
335 dev->cbd_immediate = 0;
340 dprintk("%s: type %d layout 0x%x immediate %d\n",
341 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
345 dprintk("%s: status %d ndevs %d\n",
346 __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,
406 struct cb_sequenceargs *args)
412 status = decode_sessionid(xdr, &args->csa_sessionid);
416 p = read_buf(xdr, 5 * sizeof(uint32_t));
417 if (unlikely(p == NULL))
418 return htonl(NFS4ERR_RESOURCE);
420 args->csa_addr = svc_addr(rqstp);
421 args->csa_sequenceid = ntohl(*p++);
422 args->csa_slotid = ntohl(*p++);
423 args->csa_highestslotid = ntohl(*p++);
424 args->csa_cachethis = ntohl(*p++);
425 args->csa_nrclists = ntohl(*p++);
426 args->csa_rclists = NULL;
427 if (args->csa_nrclists) {
428 args->csa_rclists = kmalloc_array(args->csa_nrclists,
429 sizeof(*args->csa_rclists),
431 if (unlikely(args->csa_rclists == NULL))
432 return htonl(NFS4ERR_RESOURCE);
434 for (i = 0; i < args->csa_nrclists; i++) {
435 status = decode_rc_list(xdr, &args->csa_rclists[i]);
437 args->csa_nrclists = i;
445 for (i = 0; i < args->csa_nrclists; i++)
446 kfree(args->csa_rclists[i].rcl_refcalls);
447 kfree(args->csa_rclists);
451 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
452 struct xdr_stream *xdr,
453 struct cb_recallanyargs *args)
458 p = read_buf(xdr, 4);
459 if (unlikely(p == NULL))
460 return htonl(NFS4ERR_BADXDR);
461 args->craa_objs_to_keep = ntohl(*p++);
462 status = decode_bitmap(xdr, bitmap);
463 if (unlikely(status))
465 args->craa_type_mask = bitmap[0];
470 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
471 struct xdr_stream *xdr,
472 struct cb_recallslotargs *args)
476 p = read_buf(xdr, 4);
477 if (unlikely(p == NULL))
478 return htonl(NFS4ERR_BADXDR);
479 args->crsa_target_highest_slotid = ntohl(*p++);
483 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
488 p = read_buf(xdr, 12);
489 if (unlikely(p == NULL))
490 return htonl(NFS4ERR_BADXDR);
492 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
493 len = be32_to_cpu(*p);
495 p = read_buf(xdr, len);
496 if (unlikely(p == NULL))
497 return htonl(NFS4ERR_BADXDR);
499 /* Only try to decode if the length is right */
501 p += 2; /* skip "lock id:" */
502 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
503 xdr_decode_hyper(p, &args->cbnl_owner.id);
504 args->cbnl_valid = true;
506 args->cbnl_owner.s_dev = 0;
507 args->cbnl_owner.id = 0;
508 args->cbnl_valid = false;
513 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_notify_lock_args *args)
517 status = decode_fh(xdr, &args->cbnl_fh);
518 if (unlikely(status != 0))
520 return decode_lockowner(xdr, args);
523 #endif /* CONFIG_NFS_V4_1 */
525 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
527 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
528 return cpu_to_be32(NFS4ERR_RESOURCE);
532 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
533 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
534 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
539 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
540 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
542 p = xdr_reserve_space(xdr, 16);
543 if (unlikely(p == NULL))
544 return htonl(NFS4ERR_RESOURCE);
548 } else if (bm[0] != 0) {
549 p = xdr_reserve_space(xdr, 12);
550 if (unlikely(p == NULL))
551 return htonl(NFS4ERR_RESOURCE);
555 p = xdr_reserve_space(xdr, 8);
556 if (unlikely(p == NULL))
557 return htonl(NFS4ERR_RESOURCE);
564 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
568 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
570 p = xdr_reserve_space(xdr, 8);
572 return htonl(NFS4ERR_RESOURCE);
573 p = xdr_encode_hyper(p, change);
577 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
581 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
583 p = xdr_reserve_space(xdr, 8);
585 return htonl(NFS4ERR_RESOURCE);
586 p = xdr_encode_hyper(p, size);
590 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
594 p = xdr_reserve_space(xdr, 12);
596 return htonl(NFS4ERR_RESOURCE);
597 p = xdr_encode_hyper(p, time->tv_sec);
598 *p = htonl(time->tv_nsec);
602 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
604 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
606 return encode_attr_time(xdr,time);
609 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
611 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
613 return encode_attr_time(xdr,time);
616 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
620 hdr->status = xdr_reserve_space(xdr, 4);
621 if (unlikely(hdr->status == NULL))
622 return htonl(NFS4ERR_RESOURCE);
623 status = encode_string(xdr, hdr->taglen, hdr->tag);
624 if (unlikely(status != 0))
626 hdr->nops = xdr_reserve_space(xdr, 4);
627 if (unlikely(hdr->nops == NULL))
628 return htonl(NFS4ERR_RESOURCE);
632 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
636 p = xdr_reserve_space(xdr, 8);
637 if (unlikely(p == NULL))
638 return htonl(NFS4ERR_RESOURCE_HDR);
644 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
646 __be32 *savep = NULL;
647 __be32 status = res->status;
649 if (unlikely(status != 0))
651 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
652 if (unlikely(status != 0))
654 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
655 if (unlikely(status != 0))
657 status = encode_attr_size(xdr, res->bitmap, res->size);
658 if (unlikely(status != 0))
660 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
661 if (unlikely(status != 0))
663 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
664 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
669 #if defined(CONFIG_NFS_V4_1)
671 static __be32 encode_sessionid(struct xdr_stream *xdr,
672 const struct nfs4_sessionid *sid)
676 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
677 if (unlikely(p == NULL))
678 return htonl(NFS4ERR_RESOURCE);
680 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
684 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
685 struct xdr_stream *xdr,
686 const struct cb_sequenceres *res)
689 __be32 status = res->csr_status;
691 if (unlikely(status != 0))
694 status = encode_sessionid(xdr, &res->csr_sessionid);
698 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
699 if (unlikely(p == NULL))
700 return htonl(NFS4ERR_RESOURCE);
702 *p++ = htonl(res->csr_sequenceid);
703 *p++ = htonl(res->csr_slotid);
704 *p++ = htonl(res->csr_highestslotid);
705 *p++ = htonl(res->csr_target_highestslotid);
710 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
712 if (op_nr == OP_CB_SEQUENCE) {
714 return htonl(NFS4ERR_SEQUENCE_POS);
717 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
724 case OP_CB_RECALL_ANY:
725 case OP_CB_RECALL_SLOT:
726 case OP_CB_LAYOUTRECALL:
727 case OP_CB_NOTIFY_DEVICEID:
728 case OP_CB_NOTIFY_LOCK:
729 *op = &callback_ops[op_nr];
733 case OP_CB_PUSH_DELEG:
734 case OP_CB_RECALLABLE_OBJ_AVAIL:
735 case OP_CB_WANTS_CANCELLED:
736 return htonl(NFS4ERR_NOTSUPP);
739 return htonl(NFS4ERR_OP_ILLEGAL);
742 return htonl(NFS_OK);
745 static void nfs4_callback_free_slot(struct nfs4_session *session,
746 struct nfs4_slot *slot)
748 struct nfs4_slot_table *tbl = &session->bc_slot_table;
750 spin_lock(&tbl->slot_tbl_lock);
752 * Let the state manager know callback processing done.
753 * A single slot, so highest used slotid is either 0 or -1
755 nfs4_free_slot(tbl, slot);
756 nfs4_slot_tbl_drain_complete(tbl);
757 spin_unlock(&tbl->slot_tbl_lock);
760 static void nfs4_cb_free_slot(struct cb_process_state *cps)
763 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
768 #else /* CONFIG_NFS_V4_1 */
771 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
773 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
776 static void nfs4_cb_free_slot(struct cb_process_state *cps)
779 #endif /* CONFIG_NFS_V4_1 */
781 #ifdef CONFIG_NFS_V4_2
783 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
785 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
786 if (status != htonl(NFS4ERR_OP_ILLEGAL))
789 if (op_nr == OP_CB_OFFLOAD)
790 return htonl(NFS4ERR_NOTSUPP);
791 return htonl(NFS4ERR_OP_ILLEGAL);
793 #else /* CONFIG_NFS_V4_2 */
795 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
797 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
799 #endif /* CONFIG_NFS_V4_2 */
802 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
807 *op = &callback_ops[op_nr];
810 return htonl(NFS4ERR_OP_ILLEGAL);
813 return htonl(NFS_OK);
816 static __be32 process_op(int nop, struct svc_rqst *rqstp,
817 struct xdr_stream *xdr_in, void *argp,
818 struct xdr_stream *xdr_out, void *resp,
819 struct cb_process_state *cps)
821 struct callback_op *op = &callback_ops[0];
827 status = decode_op_hdr(xdr_in, &op_nr);
828 if (unlikely(status))
831 switch (cps->minorversion) {
833 status = preprocess_nfs4_op(op_nr, &op);
836 status = preprocess_nfs41_op(nop, op_nr, &op);
839 status = preprocess_nfs42_op(nop, op_nr, &op);
842 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
845 if (status == htonl(NFS4ERR_OP_ILLEGAL))
846 op_nr = OP_CB_ILLEGAL;
850 if (cps->drc_status) {
851 status = cps->drc_status;
855 maxlen = xdr_out->end - xdr_out->p;
856 if (maxlen > 0 && maxlen < PAGE_SIZE) {
857 status = op->decode_args(rqstp, xdr_in, argp);
858 if (likely(status == 0))
859 status = op->process_op(argp, resp, cps);
861 status = htonl(NFS4ERR_RESOURCE);
864 res = encode_op_hdr(xdr_out, op_nr, status);
867 if (op->encode_res != NULL && status == 0)
868 status = op->encode_res(rqstp, xdr_out, resp);
873 * Decode, process and encode a COMPOUND
875 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
877 struct cb_compound_hdr_arg hdr_arg = { 0 };
878 struct cb_compound_hdr_res hdr_res = { NULL };
879 struct xdr_stream xdr_in, xdr_out;
881 struct cb_process_state cps = {
884 .net = SVC_NET(rqstp),
886 unsigned int nops = 0;
888 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
890 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
891 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
893 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
894 if (status == htonl(NFS4ERR_RESOURCE))
895 return rpc_garbage_args;
897 if (hdr_arg.minorversion == 0) {
898 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
899 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
900 goto out_invalidcred;
903 cps.minorversion = hdr_arg.minorversion;
904 hdr_res.taglen = hdr_arg.taglen;
905 hdr_res.tag = hdr_arg.tag;
906 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
907 return rpc_system_err;
909 while (status == 0 && nops != hdr_arg.nops) {
910 status = process_op(nops, rqstp, &xdr_in,
911 argp, &xdr_out, resp, &cps);
915 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
916 * resource error in cb_compound status without returning op */
917 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
918 status = htonl(NFS4ERR_RESOURCE);
922 *hdr_res.status = status;
923 *hdr_res.nops = htonl(nops);
924 nfs4_cb_free_slot(&cps);
925 nfs_put_client(cps.clp);
929 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
930 return rpc_autherr_badcred;
934 * Define NFS4 callback COMPOUND ops.
936 static struct callback_op callback_ops[] = {
938 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
941 .process_op = (callback_process_op_t)nfs4_callback_getattr,
942 .decode_args = (callback_decode_arg_t)decode_getattr_args,
943 .encode_res = (callback_encode_res_t)encode_getattr_res,
944 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
947 .process_op = (callback_process_op_t)nfs4_callback_recall,
948 .decode_args = (callback_decode_arg_t)decode_recall_args,
949 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
951 #if defined(CONFIG_NFS_V4_1)
952 [OP_CB_LAYOUTRECALL] = {
953 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
955 (callback_decode_arg_t)decode_layoutrecall_args,
956 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
958 [OP_CB_NOTIFY_DEVICEID] = {
959 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
961 (callback_decode_arg_t)decode_devicenotify_args,
962 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
965 .process_op = (callback_process_op_t)nfs4_callback_sequence,
966 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
967 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
968 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
970 [OP_CB_RECALL_ANY] = {
971 .process_op = (callback_process_op_t)nfs4_callback_recallany,
972 .decode_args = (callback_decode_arg_t)decode_recallany_args,
973 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
975 [OP_CB_RECALL_SLOT] = {
976 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
977 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
978 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
980 [OP_CB_NOTIFY_LOCK] = {
981 .process_op = (callback_process_op_t)nfs4_callback_notify_lock,
982 .decode_args = (callback_decode_arg_t)decode_notify_lock_args,
983 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
985 #endif /* CONFIG_NFS_V4_1 */
989 * Define NFS4 callback procedures
991 static struct svc_procedure nfs4_callback_procedures1[] = {
993 .pc_func = nfs4_callback_null,
994 .pc_decode = (kxdrproc_t)nfs4_decode_void,
995 .pc_encode = (kxdrproc_t)nfs4_encode_void,
999 .pc_func = nfs4_callback_compound,
1000 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1003 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1007 struct svc_version nfs4_callback_version1 = {
1009 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1010 .vs_proc = nfs4_callback_procedures1,
1011 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1012 .vs_dispatch = NULL,
1014 .vs_need_cong_ctrl = true,
1017 struct svc_version nfs4_callback_version4 = {
1019 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1020 .vs_proc = nfs4_callback_procedures1,
1021 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1022 .vs_dispatch = NULL,
1024 .vs_need_cong_ctrl = true,