blob: eb094c6011d85bb7ce7bd544a3d203defd50b03a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfs/callback_xdr.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback encode/decode procedures
7 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/kernel.h>
9#include <linux/sunrpc/svc.h>
10#include <linux/nfs4.h>
11#include <linux/nfs_fs.h>
Trond Myklebust9a3ba432012-03-12 18:01:48 -040012#include <linux/ratelimit.h>
13#include <linux/printk.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Andy Adamsonc36fca52011-01-06 02:04:32 +000015#include <linux/sunrpc/bc_xprt.h>
Trond Myklebust4ce79712005-06-22 17:16:21 +000016#include "nfs4_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include "callback.h"
Andy Adamsonc36fca52011-01-06 02:04:32 +000018#include "internal.h"
Trond Myklebust76e697b2012-11-26 14:20:49 -050019#include "nfs4session.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Kinglong Mee45724e82015-09-24 20:57:58 +080021#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 */\
27 (2 + 2 + 3 + 3) * 4)
28#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Benny Halevy4aece6a2009-04-01 09:23:26 -040030#if defined(CONFIG_NFS_V4_1)
Fred Isamanf2a62562011-01-06 11:36:29 +000031#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
Marc Eshel1be56832011-05-22 19:47:09 +030032#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
Benny Halevy4aece6a2009-04-01 09:23:26 -040033#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
Kinglong Mee45724e82015-09-24 20:57:58 +080034 NFS4_MAX_SESSIONID_LEN + \
35 (1 + 3) * 4) // seqid, 3 slotids
Alexandros Batsakis31f09602009-12-05 13:27:02 -050036#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
Andy Adamsonb9efa1b2010-01-20 16:06:27 -050037#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
Jeff Laytondb783682016-09-17 18:17:36 -040038#define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
Benny Halevy4aece6a2009-04-01 09:23:26 -040039#endif /* CONFIG_NFS_V4_1 */
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#define NFSDBG_FACILITY NFSDBG_CALLBACK
42
Andy Adamson31d2b432010-01-14 17:45:04 -050043/* Internal error code */
44#define NFS4ERR_RESOURCE_HDR 11050
45
Andy Adamsonc36fca52011-01-06 02:04:32 +000046typedef __be32 (*callback_process_op_t)(void *, void *,
47 struct cb_process_state *);
Al Viroe6f684f2006-10-19 23:28:50 -070048typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
49typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51
52struct callback_op {
53 callback_process_op_t process_op;
54 callback_decode_arg_t decode_args;
55 callback_encode_res_t encode_res;
56 long res_maxsize;
57};
58
59static struct callback_op callback_ops[];
60
Al Viro7111c662006-10-19 23:28:45 -070061static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 return htonl(NFS4_OK);
64}
65
Al Viro5704fde2006-10-19 23:28:51 -070066static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
68 return xdr_argsize_check(rqstp, p);
69}
70
Al Viro5704fde2006-10-19 23:28:51 -070071static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
73 return xdr_ressize_check(rqstp, p);
74}
75
Jeff Laytonb60475c2016-09-17 18:17:31 -040076static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
Al Viro5704fde2006-10-19 23:28:51 -070078 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80 p = xdr_inline_decode(xdr, nbytes);
81 if (unlikely(p == NULL))
Trond Myklebust756b9b32015-12-07 12:52:23 -080082 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 return p;
84}
85
Al Viroe6f684f2006-10-19 23:28:50 -070086static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
Al Viro5704fde2006-10-19 23:28:51 -070088 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90 p = read_buf(xdr, 4);
91 if (unlikely(p == NULL))
92 return htonl(NFS4ERR_RESOURCE);
93 *len = ntohl(*p);
94
95 if (*len != 0) {
96 p = read_buf(xdr, *len);
97 if (unlikely(p == NULL))
98 return htonl(NFS4ERR_RESOURCE);
99 *str = (const char *)p;
100 } else
101 *str = NULL;
102
103 return 0;
104}
105
Al Viroe6f684f2006-10-19 23:28:50 -0700106static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
Al Viro5704fde2006-10-19 23:28:51 -0700108 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
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);
121 return 0;
122}
123
Al Viroe6f684f2006-10-19 23:28:50 -0700124static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Al Viro5704fde2006-10-19 23:28:51 -0700126 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 unsigned int attrlen;
128
129 p = read_buf(xdr, 4);
130 if (unlikely(p == NULL))
131 return htonl(NFS4ERR_RESOURCE);
132 attrlen = ntohl(*p);
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++);
138 if (attrlen > 1)
139 bitmap[1] = ntohl(*p);
140 return 0;
141}
142
Al Viroe6f684f2006-10-19 23:28:50 -0700143static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
Al Viro5704fde2006-10-19 23:28:51 -0700145 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Trond Myklebust2d2f24a2012-03-04 18:13:57 -0500147 p = read_buf(xdr, NFS4_STATEID_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 if (unlikely(p == NULL))
149 return htonl(NFS4ERR_RESOURCE);
Trond Myklebust93b717f2016-05-16 17:42:43 -0400150 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 return 0;
152}
153
Trond Myklebust93b717f2016-05-16 17:42:43 -0400154static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
155{
156 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
157 return decode_stateid(xdr, stateid);
158}
159
Al Viroe6f684f2006-10-19 23:28:50 -0700160static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
Al Viro5704fde2006-10-19 23:28:51 -0700162 __be32 *p;
Al Viroe6f684f2006-10-19 23:28:50 -0700163 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
166 if (unlikely(status != 0))
167 return status;
168 /* We do not like overly long tags! */
Kinglong Mee403889c2015-09-24 20:58:16 +0800169 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ) {
Weston Andros Adamsona0308892012-01-26 13:32:23 -0500170 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700171 __func__, hdr->taglen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 return htonl(NFS4ERR_RESOURCE);
173 }
174 p = read_buf(xdr, 12);
175 if (unlikely(p == NULL))
176 return htonl(NFS4ERR_RESOURCE);
Benny Halevyb8f2ef82009-04-01 09:23:19 -0400177 hdr->minorversion = ntohl(*p++);
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400178 /* Check for minor version support */
179 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
Steve Dickson42c2c422013-05-22 12:50:38 -0400180 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
Benny Halevy48a9e2d2009-04-01 09:23:20 -0400181 } else {
Trond Myklebust9a3ba432012-03-12 18:01:48 -0400182 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
Benny Halevyb8f2ef82009-04-01 09:23:19 -0400183 "illegal minor version %u!\n",
184 __func__, hdr->minorversion);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
186 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 hdr->nops = ntohl(*p);
Benny Halevyb8f2ef82009-04-01 09:23:19 -0400188 dprintk("%s: minorversion %d nops %d\n", __func__,
189 hdr->minorversion, hdr->nops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 return 0;
191}
192
Al Viroe6f684f2006-10-19 23:28:50 -0700193static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
Al Viro5704fde2006-10-19 23:28:51 -0700195 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 p = read_buf(xdr, 4);
197 if (unlikely(p == NULL))
Andy Adamson31d2b432010-01-14 17:45:04 -0500198 return htonl(NFS4ERR_RESOURCE_HDR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 *op = ntohl(*p);
200 return 0;
201}
202
Al Viroe6f684f2006-10-19 23:28:50 -0700203static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
Al Viroe6f684f2006-10-19 23:28:50 -0700205 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207 status = decode_fh(xdr, &args->fh);
208 if (unlikely(status != 0))
209 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 status = decode_bitmap(xdr, args->bitmap);
211out:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700212 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 return status;
214}
215
Al Viroe6f684f2006-10-19 23:28:50 -0700216static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
Al Viro5704fde2006-10-19 23:28:51 -0700218 __be32 *p;
Al Viroe6f684f2006-10-19 23:28:50 -0700219 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Trond Myklebust93b717f2016-05-16 17:42:43 -0400221 status = decode_delegation_stateid(xdr, &args->stateid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 if (unlikely(status != 0))
223 goto out;
224 p = read_buf(xdr, 4);
225 if (unlikely(p == NULL)) {
226 status = htonl(NFS4ERR_RESOURCE);
227 goto out;
228 }
229 args->truncate = ntohl(*p);
230 status = decode_fh(xdr, &args->fh);
231out:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700232 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
Alexey Dobriyan3873bc52006-05-27 03:31:12 +0400233 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234}
235
Benny Halevy4aece6a2009-04-01 09:23:26 -0400236#if defined(CONFIG_NFS_V4_1)
Trond Myklebust93b717f2016-05-16 17:42:43 -0400237static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
238{
239 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
240 return decode_stateid(xdr, stateid);
241}
Benny Halevy4aece6a2009-04-01 09:23:26 -0400242
Fred Isamanf2a62562011-01-06 11:36:29 +0000243static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
244 struct xdr_stream *xdr,
245 struct cb_layoutrecallargs *args)
246{
247 __be32 *p;
248 __be32 status = 0;
249 uint32_t iomode;
250
Fred Isamanf2a62562011-01-06 11:36:29 +0000251 p = read_buf(xdr, 4 * sizeof(uint32_t));
252 if (unlikely(p == NULL)) {
253 status = htonl(NFS4ERR_BADXDR);
254 goto out;
255 }
256
257 args->cbl_layout_type = ntohl(*p++);
258 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300259 * as it is unusable and ignored with the other types.
Fred Isamanf2a62562011-01-06 11:36:29 +0000260 */
261 iomode = ntohl(*p++);
262 args->cbl_layoutchanged = ntohl(*p++);
263 args->cbl_recall_type = ntohl(*p++);
264
265 if (args->cbl_recall_type == RETURN_FILE) {
266 args->cbl_range.iomode = iomode;
267 status = decode_fh(xdr, &args->cbl_fh);
268 if (unlikely(status != 0))
269 goto out;
270
271 p = read_buf(xdr, 2 * sizeof(uint64_t));
272 if (unlikely(p == NULL)) {
273 status = htonl(NFS4ERR_BADXDR);
274 goto out;
275 }
276 p = xdr_decode_hyper(p, &args->cbl_range.offset);
277 p = xdr_decode_hyper(p, &args->cbl_range.length);
Trond Myklebust93b717f2016-05-16 17:42:43 -0400278 status = decode_layout_stateid(xdr, &args->cbl_stateid);
Fred Isamanf2a62562011-01-06 11:36:29 +0000279 if (unlikely(status != 0))
280 goto out;
281 } else if (args->cbl_recall_type == RETURN_FSID) {
282 p = read_buf(xdr, 2 * sizeof(uint64_t));
283 if (unlikely(p == NULL)) {
284 status = htonl(NFS4ERR_BADXDR);
285 goto out;
286 }
287 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
288 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
289 } else if (args->cbl_recall_type != RETURN_ALL) {
290 status = htonl(NFS4ERR_BADXDR);
291 goto out;
292 }
293 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
294 __func__,
295 args->cbl_layout_type, iomode,
296 args->cbl_layoutchanged, args->cbl_recall_type);
297out:
298 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
299 return status;
300}
301
Marc Eshel1be56832011-05-22 19:47:09 +0300302static
303__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
304 struct xdr_stream *xdr,
305 struct cb_devicenotifyargs *args)
306{
307 __be32 *p;
308 __be32 status = 0;
309 u32 tmp;
310 int n, i;
311 args->ndevs = 0;
312
313 /* Num of device notifications */
314 p = read_buf(xdr, sizeof(uint32_t));
315 if (unlikely(p == NULL)) {
316 status = htonl(NFS4ERR_BADXDR);
317 goto out;
318 }
319 n = ntohl(*p++);
320 if (n <= 0)
321 goto out;
Dan Carpenter363e0df02012-01-12 10:16:14 +0300322 if (n > ULONG_MAX / sizeof(*args->devs)) {
323 status = htonl(NFS4ERR_BADXDR);
324 goto out;
325 }
Marc Eshel1be56832011-05-22 19:47:09 +0300326
Trond Myklebusta4f743a2015-02-11 17:49:13 -0500327 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
Marc Eshel1be56832011-05-22 19:47:09 +0300328 if (!args->devs) {
329 status = htonl(NFS4ERR_DELAY);
330 goto out;
331 }
332
333 /* Decode each dev notification */
334 for (i = 0; i < n; i++) {
335 struct cb_devicenotifyitem *dev = &args->devs[i];
336
337 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
338 if (unlikely(p == NULL)) {
339 status = htonl(NFS4ERR_BADXDR);
340 goto err;
341 }
342
343 tmp = ntohl(*p++); /* bitmap size */
344 if (tmp != 1) {
345 status = htonl(NFS4ERR_INVAL);
346 goto err;
347 }
348 dev->cbd_notify_type = ntohl(*p++);
349 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
350 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
351 status = htonl(NFS4ERR_INVAL);
352 goto err;
353 }
354
355 tmp = ntohl(*p++); /* opaque size */
356 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
357 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
358 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
359 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
360 status = htonl(NFS4ERR_INVAL);
361 goto err;
362 }
363 dev->cbd_layout_type = ntohl(*p++);
364 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
365 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
366
367 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
368 p = read_buf(xdr, sizeof(uint32_t));
369 if (unlikely(p == NULL)) {
370 status = htonl(NFS4ERR_BADXDR);
371 goto err;
372 }
373 dev->cbd_immediate = ntohl(*p++);
374 } else {
375 dev->cbd_immediate = 0;
376 }
377
378 args->ndevs++;
379
380 dprintk("%s: type %d layout 0x%x immediate %d\n",
381 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
382 dev->cbd_immediate);
383 }
384out:
385 dprintk("%s: status %d ndevs %d\n",
386 __func__, ntohl(status), args->ndevs);
387 return status;
388err:
389 kfree(args->devs);
390 goto out;
391}
392
Andy Adamson9733f0d2010-01-22 12:03:08 -0500393static __be32 decode_sessionid(struct xdr_stream *xdr,
Benny Halevy4aece6a2009-04-01 09:23:26 -0400394 struct nfs4_sessionid *sid)
395{
Andy Adamson9733f0d2010-01-22 12:03:08 -0500396 __be32 *p;
Benny Halevy4aece6a2009-04-01 09:23:26 -0400397
Kinglong Mee590184a2015-09-24 20:57:37 +0800398 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
Benny Halevy4aece6a2009-04-01 09:23:26 -0400399 if (unlikely(p == NULL))
Joe Perchesa419aef2009-08-18 11:18:35 -0700400 return htonl(NFS4ERR_RESOURCE);
Benny Halevy4aece6a2009-04-01 09:23:26 -0400401
Kinglong Mee590184a2015-09-24 20:57:37 +0800402 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
Benny Halevy4aece6a2009-04-01 09:23:26 -0400403 return 0;
404}
405
Andy Adamson9733f0d2010-01-22 12:03:08 -0500406static __be32 decode_rc_list(struct xdr_stream *xdr,
Benny Halevy4aece6a2009-04-01 09:23:26 -0400407 struct referring_call_list *rc_list)
408{
Andy Adamson9733f0d2010-01-22 12:03:08 -0500409 __be32 *p;
Benny Halevy4aece6a2009-04-01 09:23:26 -0400410 int i;
Andy Adamson9733f0d2010-01-22 12:03:08 -0500411 __be32 status;
Benny Halevy4aece6a2009-04-01 09:23:26 -0400412
413 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
414 if (status)
415 goto out;
416
417 status = htonl(NFS4ERR_RESOURCE);
418 p = read_buf(xdr, sizeof(uint32_t));
419 if (unlikely(p == NULL))
420 goto out;
421
422 rc_list->rcl_nrefcalls = ntohl(*p++);
423 if (rc_list->rcl_nrefcalls) {
424 p = read_buf(xdr,
425 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
426 if (unlikely(p == NULL))
427 goto out;
Trond Myklebusta4f743a2015-02-11 17:49:13 -0500428 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
Benny Halevy4aece6a2009-04-01 09:23:26 -0400429 sizeof(*rc_list->rcl_refcalls),
430 GFP_KERNEL);
431 if (unlikely(rc_list->rcl_refcalls == NULL))
432 goto out;
433 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
434 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
435 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
436 }
437 }
438 status = 0;
439
440out:
441 return status;
442}
443
Andy Adamson9733f0d2010-01-22 12:03:08 -0500444static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
Benny Halevy4aece6a2009-04-01 09:23:26 -0400445 struct xdr_stream *xdr,
446 struct cb_sequenceargs *args)
447{
Andy Adamson9733f0d2010-01-22 12:03:08 -0500448 __be32 *p;
Benny Halevy4aece6a2009-04-01 09:23:26 -0400449 int i;
Andy Adamson9733f0d2010-01-22 12:03:08 -0500450 __be32 status;
Benny Halevy4aece6a2009-04-01 09:23:26 -0400451
452 status = decode_sessionid(xdr, &args->csa_sessionid);
453 if (status)
454 goto out;
455
456 status = htonl(NFS4ERR_RESOURCE);
457 p = read_buf(xdr, 5 * sizeof(uint32_t));
458 if (unlikely(p == NULL))
459 goto out;
460
Ricardo Labiaga65fc64e2009-04-01 09:23:30 -0400461 args->csa_addr = svc_addr(rqstp);
Benny Halevy4aece6a2009-04-01 09:23:26 -0400462 args->csa_sequenceid = ntohl(*p++);
463 args->csa_slotid = ntohl(*p++);
464 args->csa_highestslotid = ntohl(*p++);
465 args->csa_cachethis = ntohl(*p++);
466 args->csa_nrclists = ntohl(*p++);
467 args->csa_rclists = NULL;
468 if (args->csa_nrclists) {
Dan Carpenter0439f312012-06-12 10:37:08 +0300469 args->csa_rclists = kmalloc_array(args->csa_nrclists,
470 sizeof(*args->csa_rclists),
471 GFP_KERNEL);
Benny Halevy4aece6a2009-04-01 09:23:26 -0400472 if (unlikely(args->csa_rclists == NULL))
473 goto out;
474
475 for (i = 0; i < args->csa_nrclists; i++) {
476 status = decode_rc_list(xdr, &args->csa_rclists[i]);
Trond Myklebustd8ba1f92015-02-11 17:27:55 -0500477 if (status) {
478 args->csa_nrclists = i;
Benny Halevy4aece6a2009-04-01 09:23:26 -0400479 goto out_free;
Trond Myklebustd8ba1f92015-02-11 17:27:55 -0500480 }
Benny Halevy4aece6a2009-04-01 09:23:26 -0400481 }
482 }
483 status = 0;
484
485 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
486 "highestslotid %u cachethis %d nrclists %u\n",
487 __func__,
488 ((u32 *)&args->csa_sessionid)[0],
489 ((u32 *)&args->csa_sessionid)[1],
490 ((u32 *)&args->csa_sessionid)[2],
491 ((u32 *)&args->csa_sessionid)[3],
492 args->csa_sequenceid, args->csa_slotid,
493 args->csa_highestslotid, args->csa_cachethis,
494 args->csa_nrclists);
495out:
496 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
497 return status;
498
499out_free:
500 for (i = 0; i < args->csa_nrclists; i++)
501 kfree(args->csa_rclists[i].rcl_refcalls);
502 kfree(args->csa_rclists);
503 goto out;
504}
505
Andy Adamson9733f0d2010-01-22 12:03:08 -0500506static __be32 decode_recallany_args(struct svc_rqst *rqstp,
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500507 struct xdr_stream *xdr,
508 struct cb_recallanyargs *args)
509{
Peng Taod743c3c2011-10-23 20:22:38 -0700510 uint32_t bitmap[2];
511 __be32 *p, status;
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500512
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500513 p = read_buf(xdr, 4);
514 if (unlikely(p == NULL))
515 return htonl(NFS4ERR_BADXDR);
516 args->craa_objs_to_keep = ntohl(*p++);
Peng Taod743c3c2011-10-23 20:22:38 -0700517 status = decode_bitmap(xdr, bitmap);
518 if (unlikely(status))
519 return status;
520 args->craa_type_mask = bitmap[0];
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500521
522 return 0;
523}
524
Andy Adamson9733f0d2010-01-22 12:03:08 -0500525static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500526 struct xdr_stream *xdr,
527 struct cb_recallslotargs *args)
528{
529 __be32 *p;
530
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500531 p = read_buf(xdr, 4);
532 if (unlikely(p == NULL))
533 return htonl(NFS4ERR_BADXDR);
Trond Myklebustd5fb4ce2012-11-20 20:24:02 -0500534 args->crsa_target_highest_slotid = ntohl(*p++);
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500535 return 0;
536}
537
Jeff Laytondb783682016-09-17 18:17:36 -0400538static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
539{
540 __be32 *p;
541 unsigned int len;
542
543 p = read_buf(xdr, 12);
544 if (unlikely(p == NULL))
545 return htonl(NFS4ERR_BADXDR);
546
547 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
548 len = be32_to_cpu(*p);
549
550 p = read_buf(xdr, len);
551 if (unlikely(p == NULL))
552 return htonl(NFS4ERR_BADXDR);
553
554 /* Only try to decode if the length is right */
555 if (len == 20) {
556 p += 2; /* skip "lock id:" */
557 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
558 xdr_decode_hyper(p, &args->cbnl_owner.id);
559 args->cbnl_valid = true;
560 } else {
561 args->cbnl_owner.s_dev = 0;
562 args->cbnl_owner.id = 0;
563 args->cbnl_valid = false;
564 }
565 return 0;
566}
567
568static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_notify_lock_args *args)
569{
570 __be32 status;
571
572 status = decode_fh(xdr, &args->cbnl_fh);
573 if (unlikely(status != 0))
574 goto out;
575 status = decode_lockowner(xdr, args);
576out:
577 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
578 return status;
579}
580
Benny Halevy4aece6a2009-04-01 09:23:26 -0400581#endif /* CONFIG_NFS_V4_1 */
582
Al Viroe6f684f2006-10-19 23:28:50 -0700583static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584{
Al Viro5704fde2006-10-19 23:28:51 -0700585 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
587 p = xdr_reserve_space(xdr, 4 + len);
588 if (unlikely(p == NULL))
589 return htonl(NFS4ERR_RESOURCE);
590 xdr_encode_opaque(p, str, len);
591 return 0;
592}
593
594#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
595#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
Al Viro5704fde2006-10-19 23:28:51 -0700596static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597{
Al Viro5704fde2006-10-19 23:28:51 -0700598 __be32 bm[2];
599 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
601 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
602 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
603 if (bm[1] != 0) {
604 p = xdr_reserve_space(xdr, 16);
605 if (unlikely(p == NULL))
606 return htonl(NFS4ERR_RESOURCE);
607 *p++ = htonl(2);
608 *p++ = bm[0];
609 *p++ = bm[1];
610 } else if (bm[0] != 0) {
611 p = xdr_reserve_space(xdr, 12);
612 if (unlikely(p == NULL))
613 return htonl(NFS4ERR_RESOURCE);
614 *p++ = htonl(1);
615 *p++ = bm[0];
616 } else {
617 p = xdr_reserve_space(xdr, 8);
618 if (unlikely(p == NULL))
619 return htonl(NFS4ERR_RESOURCE);
620 *p++ = htonl(0);
621 }
622 *savep = p;
623 return 0;
624}
625
Al Viroe6f684f2006-10-19 23:28:50 -0700626static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627{
Al Viro5704fde2006-10-19 23:28:51 -0700628 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
630 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
631 return 0;
632 p = xdr_reserve_space(xdr, 8);
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800633 if (unlikely(!p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 return htonl(NFS4ERR_RESOURCE);
635 p = xdr_encode_hyper(p, change);
636 return 0;
637}
638
Al Viroe6f684f2006-10-19 23:28:50 -0700639static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640{
Al Viro5704fde2006-10-19 23:28:51 -0700641 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
643 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
644 return 0;
645 p = xdr_reserve_space(xdr, 8);
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800646 if (unlikely(!p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 return htonl(NFS4ERR_RESOURCE);
648 p = xdr_encode_hyper(p, size);
649 return 0;
650}
651
Al Viroe6f684f2006-10-19 23:28:50 -0700652static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653{
Al Viro5704fde2006-10-19 23:28:51 -0700654 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
656 p = xdr_reserve_space(xdr, 12);
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800657 if (unlikely(!p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 return htonl(NFS4ERR_RESOURCE);
659 p = xdr_encode_hyper(p, time->tv_sec);
660 *p = htonl(time->tv_nsec);
661 return 0;
662}
663
Al Viroe6f684f2006-10-19 23:28:50 -0700664static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665{
666 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
667 return 0;
668 return encode_attr_time(xdr,time);
669}
670
Al Viroe6f684f2006-10-19 23:28:50 -0700671static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672{
673 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
674 return 0;
675 return encode_attr_time(xdr,time);
676}
677
Al Viroe6f684f2006-10-19 23:28:50 -0700678static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
Al Viroe6f684f2006-10-19 23:28:50 -0700680 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
682 hdr->status = xdr_reserve_space(xdr, 4);
683 if (unlikely(hdr->status == NULL))
684 return htonl(NFS4ERR_RESOURCE);
685 status = encode_string(xdr, hdr->taglen, hdr->tag);
686 if (unlikely(status != 0))
687 return status;
688 hdr->nops = xdr_reserve_space(xdr, 4);
689 if (unlikely(hdr->nops == NULL))
690 return htonl(NFS4ERR_RESOURCE);
691 return 0;
692}
693
Al Viroe6f684f2006-10-19 23:28:50 -0700694static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
Al Viro5704fde2006-10-19 23:28:51 -0700696 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698 p = xdr_reserve_space(xdr, 8);
699 if (unlikely(p == NULL))
Andy Adamson31d2b432010-01-14 17:45:04 -0500700 return htonl(NFS4ERR_RESOURCE_HDR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 *p++ = htonl(op);
702 *p = res;
703 return 0;
704}
705
Al Viroe6f684f2006-10-19 23:28:50 -0700706static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707{
Al Viro5704fde2006-10-19 23:28:51 -0700708 __be32 *savep = NULL;
Al Viroe6f684f2006-10-19 23:28:50 -0700709 __be32 status = res->status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
711 if (unlikely(status != 0))
712 goto out;
713 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
714 if (unlikely(status != 0))
715 goto out;
716 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
717 if (unlikely(status != 0))
718 goto out;
719 status = encode_attr_size(xdr, res->bitmap, res->size);
720 if (unlikely(status != 0))
721 goto out;
722 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
723 if (unlikely(status != 0))
724 goto out;
725 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
726 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
727out:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700728 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 return status;
730}
731
Benny Halevy34bc47c92009-04-01 09:23:22 -0400732#if defined(CONFIG_NFS_V4_1)
733
Andy Adamson9733f0d2010-01-22 12:03:08 -0500734static __be32 encode_sessionid(struct xdr_stream *xdr,
Benny Halevy4aece6a2009-04-01 09:23:26 -0400735 const struct nfs4_sessionid *sid)
736{
Andy Adamson9733f0d2010-01-22 12:03:08 -0500737 __be32 *p;
Benny Halevy4aece6a2009-04-01 09:23:26 -0400738
Kinglong Mee590184a2015-09-24 20:57:37 +0800739 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
Benny Halevy4aece6a2009-04-01 09:23:26 -0400740 if (unlikely(p == NULL))
741 return htonl(NFS4ERR_RESOURCE);
742
Kinglong Mee590184a2015-09-24 20:57:37 +0800743 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
Benny Halevy4aece6a2009-04-01 09:23:26 -0400744 return 0;
745}
746
Andy Adamson9733f0d2010-01-22 12:03:08 -0500747static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
Benny Halevy4aece6a2009-04-01 09:23:26 -0400748 struct xdr_stream *xdr,
749 const struct cb_sequenceres *res)
750{
Andy Adamson9733f0d2010-01-22 12:03:08 -0500751 __be32 *p;
Dan Carpentere216c8c2012-06-12 10:37:39 +0300752 __be32 status = res->csr_status;
Benny Halevy4aece6a2009-04-01 09:23:26 -0400753
754 if (unlikely(status != 0))
755 goto out;
756
Kinglong Meee0a63c02015-09-24 20:58:38 +0800757 status = encode_sessionid(xdr, &res->csr_sessionid);
758 if (status)
759 goto out;
Benny Halevy4aece6a2009-04-01 09:23:26 -0400760
761 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
762 if (unlikely(p == NULL))
763 return htonl(NFS4ERR_RESOURCE);
764
765 *p++ = htonl(res->csr_sequenceid);
766 *p++ = htonl(res->csr_slotid);
767 *p++ = htonl(res->csr_highestslotid);
768 *p++ = htonl(res->csr_target_highestslotid);
769out:
770 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
771 return status;
772}
773
Benny Halevy34bc47c92009-04-01 09:23:22 -0400774static __be32
775preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
776{
Benny Halevy281fe152009-04-01 09:23:27 -0400777 if (op_nr == OP_CB_SEQUENCE) {
778 if (nop != 0)
779 return htonl(NFS4ERR_SEQUENCE_POS);
780 } else {
781 if (nop == 0)
782 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
783 }
784
Benny Halevy34bc47c92009-04-01 09:23:22 -0400785 switch (op_nr) {
786 case OP_CB_GETATTR:
787 case OP_CB_RECALL:
Benny Halevy4aece6a2009-04-01 09:23:26 -0400788 case OP_CB_SEQUENCE:
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500789 case OP_CB_RECALL_ANY:
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500790 case OP_CB_RECALL_SLOT:
Fred Isamanf2a62562011-01-06 11:36:29 +0000791 case OP_CB_LAYOUTRECALL:
Marc Eshel1be56832011-05-22 19:47:09 +0300792 case OP_CB_NOTIFY_DEVICEID:
Jeff Laytondb783682016-09-17 18:17:36 -0400793 case OP_CB_NOTIFY_LOCK:
Benny Halevy34bc47c92009-04-01 09:23:22 -0400794 *op = &callback_ops[op_nr];
795 break;
796
Benny Halevy34bc47c92009-04-01 09:23:22 -0400797 case OP_CB_NOTIFY:
798 case OP_CB_PUSH_DELEG:
Benny Halevy34bc47c92009-04-01 09:23:22 -0400799 case OP_CB_RECALLABLE_OBJ_AVAIL:
Benny Halevy34bc47c92009-04-01 09:23:22 -0400800 case OP_CB_WANTS_CANCELLED:
Benny Halevy34bc47c92009-04-01 09:23:22 -0400801 return htonl(NFS4ERR_NOTSUPP);
802
803 default:
804 return htonl(NFS4ERR_OP_ILLEGAL);
805 }
806
807 return htonl(NFS_OK);
808}
809
Trond Myklebust810d82e2016-01-23 15:18:18 -0500810static void nfs4_callback_free_slot(struct nfs4_session *session,
811 struct nfs4_slot *slot)
Andy Adamson42acd022011-01-06 02:04:34 +0000812{
813 struct nfs4_slot_table *tbl = &session->bc_slot_table;
814
815 spin_lock(&tbl->slot_tbl_lock);
816 /*
817 * Let the state manager know callback processing done.
818 * A single slot, so highest used slotid is either 0 or -1
819 */
Trond Myklebust810d82e2016-01-23 15:18:18 -0500820 nfs4_free_slot(tbl, slot);
Andy Adamson774d5f12013-05-20 14:13:50 -0400821 nfs4_slot_tbl_drain_complete(tbl);
Andy Adamson42acd022011-01-06 02:04:34 +0000822 spin_unlock(&tbl->slot_tbl_lock);
823}
824
Trond Myklebust55a67392011-08-02 14:46:29 -0400825static void nfs4_cb_free_slot(struct cb_process_state *cps)
Andy Adamson42acd022011-01-06 02:04:34 +0000826{
Trond Myklebust810d82e2016-01-23 15:18:18 -0500827 if (cps->slot) {
828 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
829 cps->slot = NULL;
830 }
Andy Adamson42acd022011-01-06 02:04:34 +0000831}
832
Benny Halevy34bc47c92009-04-01 09:23:22 -0400833#else /* CONFIG_NFS_V4_1 */
834
835static __be32
836preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
837{
838 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
839}
840
Trond Myklebust55a67392011-08-02 14:46:29 -0400841static void nfs4_cb_free_slot(struct cb_process_state *cps)
Andy Adamson42acd022011-01-06 02:04:34 +0000842{
843}
Benny Halevy34bc47c92009-04-01 09:23:22 -0400844#endif /* CONFIG_NFS_V4_1 */
845
Bryan Schumaker6b140b82013-06-05 11:15:02 -0400846#ifdef CONFIG_NFS_V4_2
847static __be32
848preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
849{
850 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
851 if (status != htonl(NFS4ERR_OP_ILLEGAL))
852 return status;
853
854 if (op_nr == OP_CB_OFFLOAD)
855 return htonl(NFS4ERR_NOTSUPP);
856 return htonl(NFS4ERR_OP_ILLEGAL);
857}
858#else /* CONFIG_NFS_V4_2 */
859static __be32
860preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
861{
862 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
863}
864#endif /* CONFIG_NFS_V4_2 */
865
Benny Halevy34bc47c92009-04-01 09:23:22 -0400866static __be32
867preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
868{
869 switch (op_nr) {
870 case OP_CB_GETATTR:
871 case OP_CB_RECALL:
872 *op = &callback_ops[op_nr];
873 break;
874 default:
875 return htonl(NFS4ERR_OP_ILLEGAL);
876 }
877
878 return htonl(NFS_OK);
879}
880
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400881static __be32 process_op(int nop, struct svc_rqst *rqstp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 struct xdr_stream *xdr_in, void *argp,
Andy Adamsonc36fca52011-01-06 02:04:32 +0000883 struct xdr_stream *xdr_out, void *resp,
884 struct cb_process_state *cps)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885{
Trond Myklebusta162a6b2006-03-20 13:44:10 -0500886 struct callback_op *op = &callback_ops[0];
Andy Adamson31d2b432010-01-14 17:45:04 -0500887 unsigned int op_nr;
Benny Halevy34bc47c92009-04-01 09:23:22 -0400888 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 long maxlen;
Al Viroe6f684f2006-10-19 23:28:50 -0700890 __be32 res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
Harvey Harrison3110ff82008-05-02 13:42:44 -0700892 dprintk("%s: start\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 status = decode_op_hdr(xdr_in, &op_nr);
Andy Adamson31d2b432010-01-14 17:45:04 -0500894 if (unlikely(status))
895 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896
Benny Halevy34bc47c92009-04-01 09:23:22 -0400897 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400898 __func__, cps->minorversion, nop, op_nr);
Benny Halevy34bc47c92009-04-01 09:23:22 -0400899
Bryan Schumaker6b140b82013-06-05 11:15:02 -0400900 switch (cps->minorversion) {
901 case 0:
902 status = preprocess_nfs4_op(op_nr, &op);
903 break;
904 case 1:
905 status = preprocess_nfs41_op(nop, op_nr, &op);
906 break;
907 case 2:
908 status = preprocess_nfs42_op(nop, op_nr, &op);
909 break;
910 default:
911 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
912 }
913
Benny Halevy34bc47c92009-04-01 09:23:22 -0400914 if (status == htonl(NFS4ERR_OP_ILLEGAL))
915 op_nr = OP_CB_ILLEGAL;
Andy Adamsonb92b3012010-01-14 17:45:05 -0500916 if (status)
917 goto encode_hdr;
Andy Adamson31d2b432010-01-14 17:45:04 -0500918
Andy Adamsonc36fca52011-01-06 02:04:32 +0000919 if (cps->drc_status) {
920 status = cps->drc_status;
Andy Adamson49110962010-01-14 17:45:08 -0500921 goto encode_hdr;
922 }
923
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 maxlen = xdr_out->end - xdr_out->p;
925 if (maxlen > 0 && maxlen < PAGE_SIZE) {
Andy Adamsone95e60d2010-01-14 17:45:06 -0500926 status = op->decode_args(rqstp, xdr_in, argp);
927 if (likely(status == 0))
Andy Adamsonc36fca52011-01-06 02:04:32 +0000928 status = op->process_op(argp, resp, cps);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 } else
930 status = htonl(NFS4ERR_RESOURCE);
931
Andy Adamsonb92b3012010-01-14 17:45:05 -0500932encode_hdr:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 res = encode_op_hdr(xdr_out, op_nr, status);
Andy Adamson31d2b432010-01-14 17:45:04 -0500934 if (unlikely(res))
935 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 if (op->encode_res != NULL && status == 0)
937 status = op->encode_res(rqstp, xdr_out, resp);
Harvey Harrison3110ff82008-05-02 13:42:44 -0700938 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 return status;
940}
941
942/*
943 * Decode, process and encode a COMPOUND
944 */
Al Viro7111c662006-10-19 23:28:45 -0700945static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946{
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400947 struct cb_compound_hdr_arg hdr_arg = { 0 };
948 struct cb_compound_hdr_res hdr_res = { NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 struct xdr_stream xdr_in, xdr_out;
Andy Adamsonc36fca52011-01-06 02:04:32 +0000950 __be32 *p, status;
951 struct cb_process_state cps = {
952 .drc_status = 0,
953 .clp = NULL,
Stanislav Kinsbursky9695c702012-07-25 16:57:06 +0400954 .net = SVC_NET(rqstp),
Andy Adamsonc36fca52011-01-06 02:04:32 +0000955 };
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400956 unsigned int nops = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
Harvey Harrison3110ff82008-05-02 13:42:44 -0700958 dprintk("%s: start\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Trond Myklebust756b9b32015-12-07 12:52:23 -0800960 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961
Al Viro5704fde2006-10-19 23:28:51 -0700962 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
964
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400965 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
Vaishali Thakkar4ed0d832015-06-10 20:15:29 +0530966 if (status == htonl(NFS4ERR_RESOURCE))
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400967 return rpc_garbage_args;
968
Andy Adamsonc36fca52011-01-06 02:04:32 +0000969 if (hdr_arg.minorversion == 0) {
Stanislav Kinsbursky9695c702012-07-25 16:57:06 +0400970 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
Andy Adamson778be232011-01-25 15:38:01 +0000971 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
Chuck Levera4e187d2016-06-29 13:55:22 -0400972 goto out_invalidcred;
Andy Adamson778be232011-01-25 15:38:01 +0000973 }
Andy Adamsonc36fca52011-01-06 02:04:32 +0000974
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400975 cps.minorversion = hdr_arg.minorversion;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 hdr_res.taglen = hdr_arg.taglen;
977 hdr_res.tag = hdr_arg.tag;
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400978 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
979 return rpc_system_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400981 while (status == 0 && nops != hdr_arg.nops) {
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400982 status = process_op(nops, rqstp, &xdr_in,
983 argp, &xdr_out, resp, &cps);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 nops++;
985 }
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400986
Andy Adamson31d2b432010-01-14 17:45:04 -0500987 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
988 * resource error in cb_compound status without returning op */
989 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
990 status = htonl(NFS4ERR_RESOURCE);
991 nops--;
992 }
993
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 *hdr_res.status = status;
995 *hdr_res.nops = htonl(nops);
Trond Myklebust55a67392011-08-02 14:46:29 -0400996 nfs4_cb_free_slot(&cps);
Andy Adamsonc36fca52011-01-06 02:04:32 +0000997 nfs_put_client(cps.clp);
Harvey Harrison3110ff82008-05-02 13:42:44 -0700998 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 return rpc_success;
Chuck Levera4e187d2016-06-29 13:55:22 -04001000
1001out_invalidcred:
1002 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
1003 return rpc_autherr_badcred;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004}
1005
1006/*
1007 * Define NFS4 callback COMPOUND ops.
1008 */
1009static struct callback_op callback_ops[] = {
1010 [0] = {
1011 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1012 },
1013 [OP_CB_GETATTR] = {
1014 .process_op = (callback_process_op_t)nfs4_callback_getattr,
1015 .decode_args = (callback_decode_arg_t)decode_getattr_args,
1016 .encode_res = (callback_encode_res_t)encode_getattr_res,
1017 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1018 },
1019 [OP_CB_RECALL] = {
1020 .process_op = (callback_process_op_t)nfs4_callback_recall,
1021 .decode_args = (callback_decode_arg_t)decode_recall_args,
1022 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
Benny Halevy4aece6a2009-04-01 09:23:26 -04001023 },
1024#if defined(CONFIG_NFS_V4_1)
Fred Isamanf2a62562011-01-06 11:36:29 +00001025 [OP_CB_LAYOUTRECALL] = {
1026 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
1027 .decode_args =
1028 (callback_decode_arg_t)decode_layoutrecall_args,
1029 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1030 },
Marc Eshel1be56832011-05-22 19:47:09 +03001031 [OP_CB_NOTIFY_DEVICEID] = {
1032 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
1033 .decode_args =
1034 (callback_decode_arg_t)decode_devicenotify_args,
1035 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1036 },
Benny Halevy4aece6a2009-04-01 09:23:26 -04001037 [OP_CB_SEQUENCE] = {
1038 .process_op = (callback_process_op_t)nfs4_callback_sequence,
1039 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
1040 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
1041 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1042 },
Alexandros Batsakis31f09602009-12-05 13:27:02 -05001043 [OP_CB_RECALL_ANY] = {
1044 .process_op = (callback_process_op_t)nfs4_callback_recallany,
1045 .decode_args = (callback_decode_arg_t)decode_recallany_args,
1046 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1047 },
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001048 [OP_CB_RECALL_SLOT] = {
1049 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
1050 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
1051 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1052 },
Jeff Laytondb783682016-09-17 18:17:36 -04001053 [OP_CB_NOTIFY_LOCK] = {
1054 .process_op = (callback_process_op_t)nfs4_callback_notify_lock,
1055 .decode_args = (callback_decode_arg_t)decode_notify_lock_args,
1056 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1057 },
Benny Halevy4aece6a2009-04-01 09:23:26 -04001058#endif /* CONFIG_NFS_V4_1 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059};
1060
1061/*
1062 * Define NFS4 callback procedures
1063 */
1064static struct svc_procedure nfs4_callback_procedures1[] = {
1065 [CB_NULL] = {
1066 .pc_func = nfs4_callback_null,
1067 .pc_decode = (kxdrproc_t)nfs4_decode_void,
1068 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1069 .pc_xdrressize = 1,
1070 },
1071 [CB_COMPOUND] = {
1072 .pc_func = nfs4_callback_compound,
1073 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1074 .pc_argsize = 256,
1075 .pc_ressize = 256,
1076 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1077 }
1078};
1079
1080struct svc_version nfs4_callback_version1 = {
1081 .vs_vers = 1,
1082 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1083 .vs_proc = nfs4_callback_procedures1,
1084 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1085 .vs_dispatch = NULL,
Steve Dickson49697ee2009-10-13 16:07:33 -04001086 .vs_hidden = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087};
1088
Alexandros Batsakis07bccc22009-12-05 13:19:01 -05001089struct svc_version nfs4_callback_version4 = {
1090 .vs_vers = 4,
1091 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1092 .vs_proc = nfs4_callback_procedures1,
1093 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1094 .vs_dispatch = NULL,
Jeff Layton60702952011-11-04 07:04:10 -04001095 .vs_hidden = 1,
Alexandros Batsakis07bccc22009-12-05 13:19:01 -05001096};