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 #endif /* CONFIG_NFS_V4_1 */
40 #define NFSDBG_FACILITY NFSDBG_CALLBACK
42 /* Internal error code */
43 #define NFS4ERR_RESOURCE_HDR 11050
45 typedef __be32 (*callback_process_op_t)(void *, void *,
46 struct cb_process_state *);
47 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
48 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
52 callback_process_op_t process_op;
53 callback_decode_arg_t decode_args;
54 callback_encode_res_t encode_res;
58 static struct callback_op callback_ops[];
60 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
62 return htonl(NFS4_OK);
65 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
67 return xdr_argsize_check(rqstp, p);
70 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
72 return xdr_ressize_check(rqstp, p);
75 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
79 p = xdr_inline_decode(xdr, nbytes);
80 if (unlikely(p == NULL))
81 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed "
82 "or truncated request.\n");
86 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
91 if (unlikely(p == NULL))
92 return htonl(NFS4ERR_RESOURCE);
96 p = read_buf(xdr, *len);
97 if (unlikely(p == NULL))
98 return htonl(NFS4ERR_RESOURCE);
99 *str = (const char *)p;
106 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
110 p = read_buf(xdr, 4);
111 if (unlikely(p == NULL))
112 return htonl(NFS4ERR_RESOURCE);
113 fh->size = ntohl(*p);
114 if (fh->size > NFS4_FHSIZE)
115 return htonl(NFS4ERR_BADHANDLE);
116 p = read_buf(xdr, fh->size);
117 if (unlikely(p == NULL))
118 return htonl(NFS4ERR_RESOURCE);
119 memcpy(&fh->data[0], p, fh->size);
120 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
124 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
127 unsigned int attrlen;
129 p = read_buf(xdr, 4);
130 if (unlikely(p == NULL))
131 return htonl(NFS4ERR_RESOURCE);
133 p = read_buf(xdr, attrlen << 2);
134 if (unlikely(p == NULL))
135 return htonl(NFS4ERR_RESOURCE);
136 if (likely(attrlen > 0))
137 bitmap[0] = ntohl(*p++);
139 bitmap[1] = ntohl(*p);
143 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
147 p = read_buf(xdr, NFS4_STATEID_SIZE);
148 if (unlikely(p == NULL))
149 return htonl(NFS4ERR_RESOURCE);
150 memcpy(stateid, p, NFS4_STATEID_SIZE);
154 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
159 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
160 if (unlikely(status != 0))
162 /* We do not like overly long tags! */
163 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ) {
164 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
165 __func__, hdr->taglen);
166 return htonl(NFS4ERR_RESOURCE);
168 p = read_buf(xdr, 12);
169 if (unlikely(p == NULL))
170 return htonl(NFS4ERR_RESOURCE);
171 hdr->minorversion = ntohl(*p++);
172 /* Check for minor version support */
173 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
174 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
176 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
177 "illegal minor version %u!\n",
178 __func__, hdr->minorversion);
179 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
181 hdr->nops = ntohl(*p);
182 dprintk("%s: minorversion %d nops %d\n", __func__,
183 hdr->minorversion, hdr->nops);
187 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
190 p = read_buf(xdr, 4);
191 if (unlikely(p == NULL))
192 return htonl(NFS4ERR_RESOURCE_HDR);
197 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
201 status = decode_fh(xdr, &args->fh);
202 if (unlikely(status != 0))
204 status = decode_bitmap(xdr, args->bitmap);
206 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
210 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
215 status = decode_stateid(xdr, &args->stateid);
216 if (unlikely(status != 0))
218 p = read_buf(xdr, 4);
219 if (unlikely(p == NULL)) {
220 status = htonl(NFS4ERR_RESOURCE);
223 args->truncate = ntohl(*p);
224 status = decode_fh(xdr, &args->fh);
226 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
230 #if defined(CONFIG_NFS_V4_1)
232 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
233 struct xdr_stream *xdr,
234 struct cb_layoutrecallargs *args)
240 p = read_buf(xdr, 4 * sizeof(uint32_t));
241 if (unlikely(p == NULL)) {
242 status = htonl(NFS4ERR_BADXDR);
246 args->cbl_layout_type = ntohl(*p++);
247 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
248 * as it is unusable and ignored with the other types.
250 iomode = ntohl(*p++);
251 args->cbl_layoutchanged = ntohl(*p++);
252 args->cbl_recall_type = ntohl(*p++);
254 if (args->cbl_recall_type == RETURN_FILE) {
255 args->cbl_range.iomode = iomode;
256 status = decode_fh(xdr, &args->cbl_fh);
257 if (unlikely(status != 0))
260 p = read_buf(xdr, 2 * sizeof(uint64_t));
261 if (unlikely(p == NULL)) {
262 status = htonl(NFS4ERR_BADXDR);
265 p = xdr_decode_hyper(p, &args->cbl_range.offset);
266 p = xdr_decode_hyper(p, &args->cbl_range.length);
267 status = decode_stateid(xdr, &args->cbl_stateid);
268 if (unlikely(status != 0))
270 } else if (args->cbl_recall_type == RETURN_FSID) {
271 p = read_buf(xdr, 2 * sizeof(uint64_t));
272 if (unlikely(p == NULL)) {
273 status = htonl(NFS4ERR_BADXDR);
276 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
277 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
278 } else if (args->cbl_recall_type != RETURN_ALL) {
279 status = htonl(NFS4ERR_BADXDR);
282 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
284 args->cbl_layout_type, iomode,
285 args->cbl_layoutchanged, args->cbl_recall_type);
287 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
292 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
293 struct xdr_stream *xdr,
294 struct cb_devicenotifyargs *args)
302 /* Num of device notifications */
303 p = read_buf(xdr, sizeof(uint32_t));
304 if (unlikely(p == NULL)) {
305 status = htonl(NFS4ERR_BADXDR);
311 if (n > ULONG_MAX / sizeof(*args->devs)) {
312 status = htonl(NFS4ERR_BADXDR);
316 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
318 status = htonl(NFS4ERR_DELAY);
322 /* Decode each dev notification */
323 for (i = 0; i < n; i++) {
324 struct cb_devicenotifyitem *dev = &args->devs[i];
326 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
327 if (unlikely(p == NULL)) {
328 status = htonl(NFS4ERR_BADXDR);
332 tmp = ntohl(*p++); /* bitmap size */
334 status = htonl(NFS4ERR_INVAL);
337 dev->cbd_notify_type = ntohl(*p++);
338 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
339 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
340 status = htonl(NFS4ERR_INVAL);
344 tmp = ntohl(*p++); /* opaque size */
345 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
346 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
347 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
348 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
349 status = htonl(NFS4ERR_INVAL);
352 dev->cbd_layout_type = ntohl(*p++);
353 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
354 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
356 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
357 p = read_buf(xdr, sizeof(uint32_t));
358 if (unlikely(p == NULL)) {
359 status = htonl(NFS4ERR_BADXDR);
362 dev->cbd_immediate = ntohl(*p++);
364 dev->cbd_immediate = 0;
369 dprintk("%s: type %d layout 0x%x immediate %d\n",
370 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
374 dprintk("%s: status %d ndevs %d\n",
375 __func__, ntohl(status), args->ndevs);
382 static __be32 decode_sessionid(struct xdr_stream *xdr,
383 struct nfs4_sessionid *sid)
387 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
388 if (unlikely(p == NULL))
389 return htonl(NFS4ERR_RESOURCE);
391 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
395 static __be32 decode_rc_list(struct xdr_stream *xdr,
396 struct referring_call_list *rc_list)
402 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
406 status = htonl(NFS4ERR_RESOURCE);
407 p = read_buf(xdr, sizeof(uint32_t));
408 if (unlikely(p == NULL))
411 rc_list->rcl_nrefcalls = ntohl(*p++);
412 if (rc_list->rcl_nrefcalls) {
414 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
415 if (unlikely(p == NULL))
417 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
418 sizeof(*rc_list->rcl_refcalls),
420 if (unlikely(rc_list->rcl_refcalls == NULL))
422 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
423 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
424 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
433 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
434 struct xdr_stream *xdr,
435 struct cb_sequenceargs *args)
441 status = decode_sessionid(xdr, &args->csa_sessionid);
445 status = htonl(NFS4ERR_RESOURCE);
446 p = read_buf(xdr, 5 * sizeof(uint32_t));
447 if (unlikely(p == NULL))
450 args->csa_addr = svc_addr(rqstp);
451 args->csa_sequenceid = ntohl(*p++);
452 args->csa_slotid = ntohl(*p++);
453 args->csa_highestslotid = ntohl(*p++);
454 args->csa_cachethis = ntohl(*p++);
455 args->csa_nrclists = ntohl(*p++);
456 args->csa_rclists = NULL;
457 if (args->csa_nrclists) {
458 args->csa_rclists = kmalloc_array(args->csa_nrclists,
459 sizeof(*args->csa_rclists),
461 if (unlikely(args->csa_rclists == NULL))
464 for (i = 0; i < args->csa_nrclists; i++) {
465 status = decode_rc_list(xdr, &args->csa_rclists[i]);
467 args->csa_nrclists = i;
474 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
475 "highestslotid %u cachethis %d nrclists %u\n",
477 ((u32 *)&args->csa_sessionid)[0],
478 ((u32 *)&args->csa_sessionid)[1],
479 ((u32 *)&args->csa_sessionid)[2],
480 ((u32 *)&args->csa_sessionid)[3],
481 args->csa_sequenceid, args->csa_slotid,
482 args->csa_highestslotid, args->csa_cachethis,
485 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
489 for (i = 0; i < args->csa_nrclists; i++)
490 kfree(args->csa_rclists[i].rcl_refcalls);
491 kfree(args->csa_rclists);
495 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
496 struct xdr_stream *xdr,
497 struct cb_recallanyargs *args)
502 p = read_buf(xdr, 4);
503 if (unlikely(p == NULL))
504 return htonl(NFS4ERR_BADXDR);
505 args->craa_objs_to_keep = ntohl(*p++);
506 status = decode_bitmap(xdr, bitmap);
507 if (unlikely(status))
509 args->craa_type_mask = bitmap[0];
514 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
515 struct xdr_stream *xdr,
516 struct cb_recallslotargs *args)
520 p = read_buf(xdr, 4);
521 if (unlikely(p == NULL))
522 return htonl(NFS4ERR_BADXDR);
523 args->crsa_target_highest_slotid = ntohl(*p++);
527 #endif /* CONFIG_NFS_V4_1 */
529 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
533 p = xdr_reserve_space(xdr, 4 + len);
534 if (unlikely(p == NULL))
535 return htonl(NFS4ERR_RESOURCE);
536 xdr_encode_opaque(p, str, len);
540 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
541 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
542 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
547 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
548 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
550 p = xdr_reserve_space(xdr, 16);
551 if (unlikely(p == NULL))
552 return htonl(NFS4ERR_RESOURCE);
556 } else if (bm[0] != 0) {
557 p = xdr_reserve_space(xdr, 12);
558 if (unlikely(p == NULL))
559 return htonl(NFS4ERR_RESOURCE);
563 p = xdr_reserve_space(xdr, 8);
564 if (unlikely(p == NULL))
565 return htonl(NFS4ERR_RESOURCE);
572 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
576 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
578 p = xdr_reserve_space(xdr, 8);
580 return htonl(NFS4ERR_RESOURCE);
581 p = xdr_encode_hyper(p, change);
585 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
589 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
591 p = xdr_reserve_space(xdr, 8);
593 return htonl(NFS4ERR_RESOURCE);
594 p = xdr_encode_hyper(p, size);
598 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
602 p = xdr_reserve_space(xdr, 12);
604 return htonl(NFS4ERR_RESOURCE);
605 p = xdr_encode_hyper(p, time->tv_sec);
606 *p = htonl(time->tv_nsec);
610 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
612 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
614 return encode_attr_time(xdr,time);
617 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
619 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
621 return encode_attr_time(xdr,time);
624 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
628 hdr->status = xdr_reserve_space(xdr, 4);
629 if (unlikely(hdr->status == NULL))
630 return htonl(NFS4ERR_RESOURCE);
631 status = encode_string(xdr, hdr->taglen, hdr->tag);
632 if (unlikely(status != 0))
634 hdr->nops = xdr_reserve_space(xdr, 4);
635 if (unlikely(hdr->nops == NULL))
636 return htonl(NFS4ERR_RESOURCE);
640 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
644 p = xdr_reserve_space(xdr, 8);
645 if (unlikely(p == NULL))
646 return htonl(NFS4ERR_RESOURCE_HDR);
652 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
654 __be32 *savep = NULL;
655 __be32 status = res->status;
657 if (unlikely(status != 0))
659 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
660 if (unlikely(status != 0))
662 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
663 if (unlikely(status != 0))
665 status = encode_attr_size(xdr, res->bitmap, res->size);
666 if (unlikely(status != 0))
668 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
669 if (unlikely(status != 0))
671 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
672 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
674 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
678 #if defined(CONFIG_NFS_V4_1)
680 static __be32 encode_sessionid(struct xdr_stream *xdr,
681 const struct nfs4_sessionid *sid)
685 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
686 if (unlikely(p == NULL))
687 return htonl(NFS4ERR_RESOURCE);
689 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
693 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
694 struct xdr_stream *xdr,
695 const struct cb_sequenceres *res)
698 __be32 status = res->csr_status;
700 if (unlikely(status != 0))
703 status = encode_sessionid(xdr, &res->csr_sessionid);
707 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
708 if (unlikely(p == NULL))
709 return htonl(NFS4ERR_RESOURCE);
711 *p++ = htonl(res->csr_sequenceid);
712 *p++ = htonl(res->csr_slotid);
713 *p++ = htonl(res->csr_highestslotid);
714 *p++ = htonl(res->csr_target_highestslotid);
716 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
721 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
723 if (op_nr == OP_CB_SEQUENCE) {
725 return htonl(NFS4ERR_SEQUENCE_POS);
728 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
735 case OP_CB_RECALL_ANY:
736 case OP_CB_RECALL_SLOT:
737 case OP_CB_LAYOUTRECALL:
738 case OP_CB_NOTIFY_DEVICEID:
739 *op = &callback_ops[op_nr];
743 case OP_CB_PUSH_DELEG:
744 case OP_CB_RECALLABLE_OBJ_AVAIL:
745 case OP_CB_WANTS_CANCELLED:
746 case OP_CB_NOTIFY_LOCK:
747 return htonl(NFS4ERR_NOTSUPP);
750 return htonl(NFS4ERR_OP_ILLEGAL);
753 return htonl(NFS_OK);
756 static void nfs4_callback_free_slot(struct nfs4_session *session)
758 struct nfs4_slot_table *tbl = &session->bc_slot_table;
760 spin_lock(&tbl->slot_tbl_lock);
762 * Let the state manager know callback processing done.
763 * A single slot, so highest used slotid is either 0 or -1
765 tbl->highest_used_slotid = NFS4_NO_SLOT;
766 nfs4_slot_tbl_drain_complete(tbl);
767 spin_unlock(&tbl->slot_tbl_lock);
770 static void nfs4_cb_free_slot(struct cb_process_state *cps)
772 if (cps->slotid != NFS4_NO_SLOT)
773 nfs4_callback_free_slot(cps->clp->cl_session);
776 #else /* CONFIG_NFS_V4_1 */
779 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
781 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
784 static void nfs4_cb_free_slot(struct cb_process_state *cps)
787 #endif /* CONFIG_NFS_V4_1 */
789 #ifdef CONFIG_NFS_V4_2
791 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
793 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
794 if (status != htonl(NFS4ERR_OP_ILLEGAL))
797 if (op_nr == OP_CB_OFFLOAD)
798 return htonl(NFS4ERR_NOTSUPP);
799 return htonl(NFS4ERR_OP_ILLEGAL);
801 #else /* CONFIG_NFS_V4_2 */
803 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
805 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
807 #endif /* CONFIG_NFS_V4_2 */
810 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
815 *op = &callback_ops[op_nr];
818 return htonl(NFS4ERR_OP_ILLEGAL);
821 return htonl(NFS_OK);
824 static __be32 process_op(int nop, struct svc_rqst *rqstp,
825 struct xdr_stream *xdr_in, void *argp,
826 struct xdr_stream *xdr_out, void *resp,
827 struct cb_process_state *cps)
829 struct callback_op *op = &callback_ops[0];
835 dprintk("%s: start\n", __func__);
836 status = decode_op_hdr(xdr_in, &op_nr);
837 if (unlikely(status))
840 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
841 __func__, cps->minorversion, nop, op_nr);
843 switch (cps->minorversion) {
845 status = preprocess_nfs4_op(op_nr, &op);
848 status = preprocess_nfs41_op(nop, op_nr, &op);
851 status = preprocess_nfs42_op(nop, op_nr, &op);
854 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
857 if (status == htonl(NFS4ERR_OP_ILLEGAL))
858 op_nr = OP_CB_ILLEGAL;
862 if (cps->drc_status) {
863 status = cps->drc_status;
867 maxlen = xdr_out->end - xdr_out->p;
868 if (maxlen > 0 && maxlen < PAGE_SIZE) {
869 status = op->decode_args(rqstp, xdr_in, argp);
870 if (likely(status == 0))
871 status = op->process_op(argp, resp, cps);
873 status = htonl(NFS4ERR_RESOURCE);
876 res = encode_op_hdr(xdr_out, op_nr, status);
879 if (op->encode_res != NULL && status == 0)
880 status = op->encode_res(rqstp, xdr_out, resp);
881 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
886 * Decode, process and encode a COMPOUND
888 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
890 struct cb_compound_hdr_arg hdr_arg = { 0 };
891 struct cb_compound_hdr_res hdr_res = { NULL };
892 struct xdr_stream xdr_in, xdr_out;
893 struct xdr_buf *rq_arg = &rqstp->rq_arg;
895 struct cb_process_state cps = {
898 .slotid = NFS4_NO_SLOT,
899 .net = SVC_NET(rqstp),
901 unsigned int nops = 0;
903 dprintk("%s: start\n", __func__);
905 rq_arg->len = rq_arg->head[0].iov_len + rq_arg->page_len;
906 xdr_init_decode(&xdr_in, rq_arg, rq_arg->head[0].iov_base);
908 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
909 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
911 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
912 if (status == htonl(NFS4ERR_RESOURCE))
913 return rpc_garbage_args;
915 if (hdr_arg.minorversion == 0) {
916 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
917 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
918 return rpc_drop_reply;
921 cps.minorversion = hdr_arg.minorversion;
922 hdr_res.taglen = hdr_arg.taglen;
923 hdr_res.tag = hdr_arg.tag;
924 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
925 return rpc_system_err;
927 while (status == 0 && nops != hdr_arg.nops) {
928 status = process_op(nops, rqstp, &xdr_in,
929 argp, &xdr_out, resp, &cps);
933 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
934 * resource error in cb_compound status without returning op */
935 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
936 status = htonl(NFS4ERR_RESOURCE);
940 *hdr_res.status = status;
941 *hdr_res.nops = htonl(nops);
942 nfs4_cb_free_slot(&cps);
943 nfs_put_client(cps.clp);
944 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
949 * Define NFS4 callback COMPOUND ops.
951 static struct callback_op callback_ops[] = {
953 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
956 .process_op = (callback_process_op_t)nfs4_callback_getattr,
957 .decode_args = (callback_decode_arg_t)decode_getattr_args,
958 .encode_res = (callback_encode_res_t)encode_getattr_res,
959 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
962 .process_op = (callback_process_op_t)nfs4_callback_recall,
963 .decode_args = (callback_decode_arg_t)decode_recall_args,
964 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
966 #if defined(CONFIG_NFS_V4_1)
967 [OP_CB_LAYOUTRECALL] = {
968 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
970 (callback_decode_arg_t)decode_layoutrecall_args,
971 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
973 [OP_CB_NOTIFY_DEVICEID] = {
974 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
976 (callback_decode_arg_t)decode_devicenotify_args,
977 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
980 .process_op = (callback_process_op_t)nfs4_callback_sequence,
981 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
982 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
983 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
985 [OP_CB_RECALL_ANY] = {
986 .process_op = (callback_process_op_t)nfs4_callback_recallany,
987 .decode_args = (callback_decode_arg_t)decode_recallany_args,
988 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
990 [OP_CB_RECALL_SLOT] = {
991 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
992 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
993 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
995 #endif /* CONFIG_NFS_V4_1 */
999 * Define NFS4 callback procedures
1001 static struct svc_procedure nfs4_callback_procedures1[] = {
1003 .pc_func = nfs4_callback_null,
1004 .pc_decode = (kxdrproc_t)nfs4_decode_void,
1005 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1009 .pc_func = nfs4_callback_compound,
1010 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1013 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1017 struct svc_version nfs4_callback_version1 = {
1019 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1020 .vs_proc = nfs4_callback_procedures1,
1021 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1022 .vs_dispatch = NULL,
1026 struct svc_version nfs4_callback_version4 = {
1028 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1029 .vs_proc = nfs4_callback_procedures1,
1030 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1031 .vs_dispatch = NULL,