Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/callback_xdr.c | |
3 | * | |
4 | * Copyright (C) 2004 Trond Myklebust | |
5 | * | |
6 | * NFSv4 callback encode/decode procedures | |
7 | */ | |
1da177e4 LT |
8 | #include <linux/kernel.h> |
9 | #include <linux/sunrpc/svc.h> | |
10 | #include <linux/nfs4.h> | |
11 | #include <linux/nfs_fs.h> | |
4ce79717 | 12 | #include "nfs4_fs.h" |
1da177e4 LT |
13 | #include "callback.h" |
14 | ||
15 | #define CB_OP_TAGLEN_MAXSZ (512) | |
16 | #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ) | |
17 | #define CB_OP_GETATTR_BITMAP_MAXSZ (4) | |
18 | #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ | |
19 | CB_OP_GETATTR_BITMAP_MAXSZ + \ | |
20 | 2 + 2 + 3 + 3) | |
21 | #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) | |
22 | ||
4aece6a1 BH |
23 | #if defined(CONFIG_NFS_V4_1) |
24 | #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ | |
25 | 4 + 1 + 3) | |
31f09607 | 26 | #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) |
4aece6a1 BH |
27 | #endif /* CONFIG_NFS_V4_1 */ |
28 | ||
1da177e4 LT |
29 | #define NFSDBG_FACILITY NFSDBG_CALLBACK |
30 | ||
e6f684f6 AV |
31 | typedef __be32 (*callback_process_op_t)(void *, void *); |
32 | typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); | |
33 | typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); | |
1da177e4 LT |
34 | |
35 | ||
36 | struct callback_op { | |
37 | callback_process_op_t process_op; | |
38 | callback_decode_arg_t decode_args; | |
39 | callback_encode_res_t encode_res; | |
40 | long res_maxsize; | |
41 | }; | |
42 | ||
43 | static struct callback_op callback_ops[]; | |
44 | ||
7111c66e | 45 | static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) |
1da177e4 LT |
46 | { |
47 | return htonl(NFS4_OK); | |
48 | } | |
49 | ||
5704fdeb | 50 | static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
1da177e4 LT |
51 | { |
52 | return xdr_argsize_check(rqstp, p); | |
53 | } | |
54 | ||
5704fdeb | 55 | static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
1da177e4 LT |
56 | { |
57 | return xdr_ressize_check(rqstp, p); | |
58 | } | |
59 | ||
5704fdeb | 60 | static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) |
1da177e4 | 61 | { |
5704fdeb | 62 | __be32 *p; |
1da177e4 LT |
63 | |
64 | p = xdr_inline_decode(xdr, nbytes); | |
65 | if (unlikely(p == NULL)) | |
66 | printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n"); | |
67 | return p; | |
68 | } | |
69 | ||
e6f684f6 | 70 | static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) |
1da177e4 | 71 | { |
5704fdeb | 72 | __be32 *p; |
1da177e4 LT |
73 | |
74 | p = read_buf(xdr, 4); | |
75 | if (unlikely(p == NULL)) | |
76 | return htonl(NFS4ERR_RESOURCE); | |
77 | *len = ntohl(*p); | |
78 | ||
79 | if (*len != 0) { | |
80 | p = read_buf(xdr, *len); | |
81 | if (unlikely(p == NULL)) | |
82 | return htonl(NFS4ERR_RESOURCE); | |
83 | *str = (const char *)p; | |
84 | } else | |
85 | *str = NULL; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
e6f684f6 | 90 | static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) |
1da177e4 | 91 | { |
5704fdeb | 92 | __be32 *p; |
1da177e4 LT |
93 | |
94 | p = read_buf(xdr, 4); | |
95 | if (unlikely(p == NULL)) | |
96 | return htonl(NFS4ERR_RESOURCE); | |
97 | fh->size = ntohl(*p); | |
98 | if (fh->size > NFS4_FHSIZE) | |
99 | return htonl(NFS4ERR_BADHANDLE); | |
100 | p = read_buf(xdr, fh->size); | |
101 | if (unlikely(p == NULL)) | |
102 | return htonl(NFS4ERR_RESOURCE); | |
103 | memcpy(&fh->data[0], p, fh->size); | |
104 | memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); | |
105 | return 0; | |
106 | } | |
107 | ||
e6f684f6 | 108 | static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) |
1da177e4 | 109 | { |
5704fdeb | 110 | __be32 *p; |
1da177e4 LT |
111 | unsigned int attrlen; |
112 | ||
113 | p = read_buf(xdr, 4); | |
114 | if (unlikely(p == NULL)) | |
115 | return htonl(NFS4ERR_RESOURCE); | |
116 | attrlen = ntohl(*p); | |
117 | p = read_buf(xdr, attrlen << 2); | |
118 | if (unlikely(p == NULL)) | |
119 | return htonl(NFS4ERR_RESOURCE); | |
120 | if (likely(attrlen > 0)) | |
121 | bitmap[0] = ntohl(*p++); | |
122 | if (attrlen > 1) | |
123 | bitmap[1] = ntohl(*p); | |
124 | return 0; | |
125 | } | |
126 | ||
e6f684f6 | 127 | static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) |
1da177e4 | 128 | { |
5704fdeb | 129 | __be32 *p; |
1da177e4 LT |
130 | |
131 | p = read_buf(xdr, 16); | |
132 | if (unlikely(p == NULL)) | |
133 | return htonl(NFS4ERR_RESOURCE); | |
134 | memcpy(stateid->data, p, 16); | |
135 | return 0; | |
136 | } | |
137 | ||
e6f684f6 | 138 | static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) |
1da177e4 | 139 | { |
5704fdeb | 140 | __be32 *p; |
e6f684f6 | 141 | __be32 status; |
1da177e4 LT |
142 | |
143 | status = decode_string(xdr, &hdr->taglen, &hdr->tag); | |
144 | if (unlikely(status != 0)) | |
145 | return status; | |
146 | /* We do not like overly long tags! */ | |
5cce428d | 147 | if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { |
1da177e4 | 148 | printk("NFSv4 CALLBACK %s: client sent tag of length %u\n", |
3110ff80 | 149 | __func__, hdr->taglen); |
1da177e4 LT |
150 | return htonl(NFS4ERR_RESOURCE); |
151 | } | |
152 | p = read_buf(xdr, 12); | |
153 | if (unlikely(p == NULL)) | |
154 | return htonl(NFS4ERR_RESOURCE); | |
b8f2ef84 | 155 | hdr->minorversion = ntohl(*p++); |
48a9e2d2 BH |
156 | /* Check minor version is zero or one. */ |
157 | if (hdr->minorversion <= 1) { | |
158 | p++; /* skip callback_ident */ | |
159 | } else { | |
b8f2ef84 BH |
160 | printk(KERN_WARNING "%s: NFSv4 server callback with " |
161 | "illegal minor version %u!\n", | |
162 | __func__, hdr->minorversion); | |
1da177e4 LT |
163 | return htonl(NFS4ERR_MINOR_VERS_MISMATCH); |
164 | } | |
1da177e4 | 165 | hdr->nops = ntohl(*p); |
b8f2ef84 BH |
166 | dprintk("%s: minorversion %d nops %d\n", __func__, |
167 | hdr->minorversion, hdr->nops); | |
1da177e4 LT |
168 | return 0; |
169 | } | |
170 | ||
e6f684f6 | 171 | static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) |
1da177e4 | 172 | { |
5704fdeb | 173 | __be32 *p; |
1da177e4 LT |
174 | p = read_buf(xdr, 4); |
175 | if (unlikely(p == NULL)) | |
176 | return htonl(NFS4ERR_RESOURCE); | |
177 | *op = ntohl(*p); | |
178 | return 0; | |
179 | } | |
180 | ||
e6f684f6 | 181 | static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) |
1da177e4 | 182 | { |
e6f684f6 | 183 | __be32 status; |
1da177e4 LT |
184 | |
185 | status = decode_fh(xdr, &args->fh); | |
186 | if (unlikely(status != 0)) | |
187 | goto out; | |
671beed7 | 188 | args->addr = svc_addr(rqstp); |
1da177e4 LT |
189 | status = decode_bitmap(xdr, args->bitmap); |
190 | out: | |
3110ff80 | 191 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
1da177e4 LT |
192 | return status; |
193 | } | |
194 | ||
e6f684f6 | 195 | static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) |
1da177e4 | 196 | { |
5704fdeb | 197 | __be32 *p; |
e6f684f6 | 198 | __be32 status; |
1da177e4 | 199 | |
c1d35866 | 200 | args->addr = svc_addr(rqstp); |
1da177e4 LT |
201 | status = decode_stateid(xdr, &args->stateid); |
202 | if (unlikely(status != 0)) | |
203 | goto out; | |
204 | p = read_buf(xdr, 4); | |
205 | if (unlikely(p == NULL)) { | |
206 | status = htonl(NFS4ERR_RESOURCE); | |
207 | goto out; | |
208 | } | |
209 | args->truncate = ntohl(*p); | |
210 | status = decode_fh(xdr, &args->fh); | |
211 | out: | |
3110ff80 | 212 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
3873bc50 | 213 | return status; |
1da177e4 LT |
214 | } |
215 | ||
4aece6a1 BH |
216 | #if defined(CONFIG_NFS_V4_1) |
217 | ||
218 | static unsigned decode_sessionid(struct xdr_stream *xdr, | |
219 | struct nfs4_sessionid *sid) | |
220 | { | |
221 | uint32_t *p; | |
222 | int len = NFS4_MAX_SESSIONID_LEN; | |
223 | ||
224 | p = read_buf(xdr, len); | |
225 | if (unlikely(p == NULL)) | |
a419aef8 | 226 | return htonl(NFS4ERR_RESOURCE); |
4aece6a1 BH |
227 | |
228 | memcpy(sid->data, p, len); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static unsigned decode_rc_list(struct xdr_stream *xdr, | |
233 | struct referring_call_list *rc_list) | |
234 | { | |
235 | uint32_t *p; | |
236 | int i; | |
237 | unsigned status; | |
238 | ||
239 | status = decode_sessionid(xdr, &rc_list->rcl_sessionid); | |
240 | if (status) | |
241 | goto out; | |
242 | ||
243 | status = htonl(NFS4ERR_RESOURCE); | |
244 | p = read_buf(xdr, sizeof(uint32_t)); | |
245 | if (unlikely(p == NULL)) | |
246 | goto out; | |
247 | ||
248 | rc_list->rcl_nrefcalls = ntohl(*p++); | |
249 | if (rc_list->rcl_nrefcalls) { | |
250 | p = read_buf(xdr, | |
251 | rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); | |
252 | if (unlikely(p == NULL)) | |
253 | goto out; | |
254 | rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * | |
255 | sizeof(*rc_list->rcl_refcalls), | |
256 | GFP_KERNEL); | |
257 | if (unlikely(rc_list->rcl_refcalls == NULL)) | |
258 | goto out; | |
259 | for (i = 0; i < rc_list->rcl_nrefcalls; i++) { | |
260 | rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); | |
261 | rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); | |
262 | } | |
263 | } | |
264 | status = 0; | |
265 | ||
266 | out: | |
267 | return status; | |
268 | } | |
269 | ||
270 | static unsigned decode_cb_sequence_args(struct svc_rqst *rqstp, | |
271 | struct xdr_stream *xdr, | |
272 | struct cb_sequenceargs *args) | |
273 | { | |
274 | uint32_t *p; | |
275 | int i; | |
276 | unsigned status; | |
277 | ||
278 | status = decode_sessionid(xdr, &args->csa_sessionid); | |
279 | if (status) | |
280 | goto out; | |
281 | ||
282 | status = htonl(NFS4ERR_RESOURCE); | |
283 | p = read_buf(xdr, 5 * sizeof(uint32_t)); | |
284 | if (unlikely(p == NULL)) | |
285 | goto out; | |
286 | ||
65fc64e5 | 287 | args->csa_addr = svc_addr(rqstp); |
4aece6a1 BH |
288 | args->csa_sequenceid = ntohl(*p++); |
289 | args->csa_slotid = ntohl(*p++); | |
290 | args->csa_highestslotid = ntohl(*p++); | |
291 | args->csa_cachethis = ntohl(*p++); | |
292 | args->csa_nrclists = ntohl(*p++); | |
293 | args->csa_rclists = NULL; | |
294 | if (args->csa_nrclists) { | |
295 | args->csa_rclists = kmalloc(args->csa_nrclists * | |
296 | sizeof(*args->csa_rclists), | |
297 | GFP_KERNEL); | |
298 | if (unlikely(args->csa_rclists == NULL)) | |
299 | goto out; | |
300 | ||
301 | for (i = 0; i < args->csa_nrclists; i++) { | |
302 | status = decode_rc_list(xdr, &args->csa_rclists[i]); | |
303 | if (status) | |
304 | goto out_free; | |
305 | } | |
306 | } | |
307 | status = 0; | |
308 | ||
309 | dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " | |
310 | "highestslotid %u cachethis %d nrclists %u\n", | |
311 | __func__, | |
312 | ((u32 *)&args->csa_sessionid)[0], | |
313 | ((u32 *)&args->csa_sessionid)[1], | |
314 | ((u32 *)&args->csa_sessionid)[2], | |
315 | ((u32 *)&args->csa_sessionid)[3], | |
316 | args->csa_sequenceid, args->csa_slotid, | |
317 | args->csa_highestslotid, args->csa_cachethis, | |
318 | args->csa_nrclists); | |
319 | out: | |
320 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
321 | return status; | |
322 | ||
323 | out_free: | |
324 | for (i = 0; i < args->csa_nrclists; i++) | |
325 | kfree(args->csa_rclists[i].rcl_refcalls); | |
326 | kfree(args->csa_rclists); | |
327 | goto out; | |
328 | } | |
329 | ||
31f09607 AB |
330 | static unsigned decode_recallany_args(struct svc_rqst *rqstp, |
331 | struct xdr_stream *xdr, | |
332 | struct cb_recallanyargs *args) | |
333 | { | |
334 | uint32_t *p; | |
335 | ||
336 | args->craa_addr = svc_addr(rqstp); | |
337 | p = read_buf(xdr, 4); | |
338 | if (unlikely(p == NULL)) | |
339 | return htonl(NFS4ERR_BADXDR); | |
340 | args->craa_objs_to_keep = ntohl(*p++); | |
341 | p = read_buf(xdr, 4); | |
342 | if (unlikely(p == NULL)) | |
343 | return htonl(NFS4ERR_BADXDR); | |
344 | args->craa_type_mask = ntohl(*p); | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
4aece6a1 BH |
349 | #endif /* CONFIG_NFS_V4_1 */ |
350 | ||
e6f684f6 | 351 | static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) |
1da177e4 | 352 | { |
5704fdeb | 353 | __be32 *p; |
1da177e4 LT |
354 | |
355 | p = xdr_reserve_space(xdr, 4 + len); | |
356 | if (unlikely(p == NULL)) | |
357 | return htonl(NFS4ERR_RESOURCE); | |
358 | xdr_encode_opaque(p, str, len); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) | |
363 | #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) | |
5704fdeb | 364 | static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) |
1da177e4 | 365 | { |
5704fdeb AV |
366 | __be32 bm[2]; |
367 | __be32 *p; | |
1da177e4 LT |
368 | |
369 | bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); | |
370 | bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); | |
371 | if (bm[1] != 0) { | |
372 | p = xdr_reserve_space(xdr, 16); | |
373 | if (unlikely(p == NULL)) | |
374 | return htonl(NFS4ERR_RESOURCE); | |
375 | *p++ = htonl(2); | |
376 | *p++ = bm[0]; | |
377 | *p++ = bm[1]; | |
378 | } else if (bm[0] != 0) { | |
379 | p = xdr_reserve_space(xdr, 12); | |
380 | if (unlikely(p == NULL)) | |
381 | return htonl(NFS4ERR_RESOURCE); | |
382 | *p++ = htonl(1); | |
383 | *p++ = bm[0]; | |
384 | } else { | |
385 | p = xdr_reserve_space(xdr, 8); | |
386 | if (unlikely(p == NULL)) | |
387 | return htonl(NFS4ERR_RESOURCE); | |
388 | *p++ = htonl(0); | |
389 | } | |
390 | *savep = p; | |
391 | return 0; | |
392 | } | |
393 | ||
e6f684f6 | 394 | static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) |
1da177e4 | 395 | { |
5704fdeb | 396 | __be32 *p; |
1da177e4 LT |
397 | |
398 | if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) | |
399 | return 0; | |
400 | p = xdr_reserve_space(xdr, 8); | |
90dc7d27 | 401 | if (unlikely(!p)) |
1da177e4 LT |
402 | return htonl(NFS4ERR_RESOURCE); |
403 | p = xdr_encode_hyper(p, change); | |
404 | return 0; | |
405 | } | |
406 | ||
e6f684f6 | 407 | static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) |
1da177e4 | 408 | { |
5704fdeb | 409 | __be32 *p; |
1da177e4 LT |
410 | |
411 | if (!(bitmap[0] & FATTR4_WORD0_SIZE)) | |
412 | return 0; | |
413 | p = xdr_reserve_space(xdr, 8); | |
90dc7d27 | 414 | if (unlikely(!p)) |
1da177e4 LT |
415 | return htonl(NFS4ERR_RESOURCE); |
416 | p = xdr_encode_hyper(p, size); | |
417 | return 0; | |
418 | } | |
419 | ||
e6f684f6 | 420 | static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) |
1da177e4 | 421 | { |
5704fdeb | 422 | __be32 *p; |
1da177e4 LT |
423 | |
424 | p = xdr_reserve_space(xdr, 12); | |
90dc7d27 | 425 | if (unlikely(!p)) |
1da177e4 LT |
426 | return htonl(NFS4ERR_RESOURCE); |
427 | p = xdr_encode_hyper(p, time->tv_sec); | |
428 | *p = htonl(time->tv_nsec); | |
429 | return 0; | |
430 | } | |
431 | ||
e6f684f6 | 432 | static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) |
1da177e4 LT |
433 | { |
434 | if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) | |
435 | return 0; | |
436 | return encode_attr_time(xdr,time); | |
437 | } | |
438 | ||
e6f684f6 | 439 | static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) |
1da177e4 LT |
440 | { |
441 | if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) | |
442 | return 0; | |
443 | return encode_attr_time(xdr,time); | |
444 | } | |
445 | ||
e6f684f6 | 446 | static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) |
1da177e4 | 447 | { |
e6f684f6 | 448 | __be32 status; |
1da177e4 LT |
449 | |
450 | hdr->status = xdr_reserve_space(xdr, 4); | |
451 | if (unlikely(hdr->status == NULL)) | |
452 | return htonl(NFS4ERR_RESOURCE); | |
453 | status = encode_string(xdr, hdr->taglen, hdr->tag); | |
454 | if (unlikely(status != 0)) | |
455 | return status; | |
456 | hdr->nops = xdr_reserve_space(xdr, 4); | |
457 | if (unlikely(hdr->nops == NULL)) | |
458 | return htonl(NFS4ERR_RESOURCE); | |
459 | return 0; | |
460 | } | |
461 | ||
e6f684f6 | 462 | static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) |
1da177e4 | 463 | { |
5704fdeb | 464 | __be32 *p; |
1da177e4 LT |
465 | |
466 | p = xdr_reserve_space(xdr, 8); | |
467 | if (unlikely(p == NULL)) | |
468 | return htonl(NFS4ERR_RESOURCE); | |
469 | *p++ = htonl(op); | |
470 | *p = res; | |
471 | return 0; | |
472 | } | |
473 | ||
e6f684f6 | 474 | static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) |
1da177e4 | 475 | { |
5704fdeb | 476 | __be32 *savep = NULL; |
e6f684f6 | 477 | __be32 status = res->status; |
1da177e4 LT |
478 | |
479 | if (unlikely(status != 0)) | |
480 | goto out; | |
481 | status = encode_attr_bitmap(xdr, res->bitmap, &savep); | |
482 | if (unlikely(status != 0)) | |
483 | goto out; | |
484 | status = encode_attr_change(xdr, res->bitmap, res->change_attr); | |
485 | if (unlikely(status != 0)) | |
486 | goto out; | |
487 | status = encode_attr_size(xdr, res->bitmap, res->size); | |
488 | if (unlikely(status != 0)) | |
489 | goto out; | |
490 | status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); | |
491 | if (unlikely(status != 0)) | |
492 | goto out; | |
493 | status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); | |
494 | *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); | |
495 | out: | |
3110ff80 | 496 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
1da177e4 LT |
497 | return status; |
498 | } | |
499 | ||
34bc47c9 BH |
500 | #if defined(CONFIG_NFS_V4_1) |
501 | ||
4aece6a1 BH |
502 | static unsigned encode_sessionid(struct xdr_stream *xdr, |
503 | const struct nfs4_sessionid *sid) | |
504 | { | |
505 | uint32_t *p; | |
506 | int len = NFS4_MAX_SESSIONID_LEN; | |
507 | ||
508 | p = xdr_reserve_space(xdr, len); | |
509 | if (unlikely(p == NULL)) | |
510 | return htonl(NFS4ERR_RESOURCE); | |
511 | ||
512 | memcpy(p, sid, len); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | static unsigned encode_cb_sequence_res(struct svc_rqst *rqstp, | |
517 | struct xdr_stream *xdr, | |
518 | const struct cb_sequenceres *res) | |
519 | { | |
520 | uint32_t *p; | |
521 | unsigned status = res->csr_status; | |
522 | ||
523 | if (unlikely(status != 0)) | |
524 | goto out; | |
525 | ||
526 | encode_sessionid(xdr, &res->csr_sessionid); | |
527 | ||
528 | p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); | |
529 | if (unlikely(p == NULL)) | |
530 | return htonl(NFS4ERR_RESOURCE); | |
531 | ||
532 | *p++ = htonl(res->csr_sequenceid); | |
533 | *p++ = htonl(res->csr_slotid); | |
534 | *p++ = htonl(res->csr_highestslotid); | |
535 | *p++ = htonl(res->csr_target_highestslotid); | |
536 | out: | |
537 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
538 | return status; | |
539 | } | |
540 | ||
34bc47c9 BH |
541 | static __be32 |
542 | preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) | |
543 | { | |
281fe15d BH |
544 | if (op_nr == OP_CB_SEQUENCE) { |
545 | if (nop != 0) | |
546 | return htonl(NFS4ERR_SEQUENCE_POS); | |
547 | } else { | |
548 | if (nop == 0) | |
549 | return htonl(NFS4ERR_OP_NOT_IN_SESSION); | |
550 | } | |
551 | ||
34bc47c9 BH |
552 | switch (op_nr) { |
553 | case OP_CB_GETATTR: | |
554 | case OP_CB_RECALL: | |
4aece6a1 | 555 | case OP_CB_SEQUENCE: |
31f09607 | 556 | case OP_CB_RECALL_ANY: |
34bc47c9 BH |
557 | *op = &callback_ops[op_nr]; |
558 | break; | |
559 | ||
560 | case OP_CB_LAYOUTRECALL: | |
561 | case OP_CB_NOTIFY_DEVICEID: | |
562 | case OP_CB_NOTIFY: | |
563 | case OP_CB_PUSH_DELEG: | |
34bc47c9 BH |
564 | case OP_CB_RECALLABLE_OBJ_AVAIL: |
565 | case OP_CB_RECALL_SLOT: | |
34bc47c9 BH |
566 | case OP_CB_WANTS_CANCELLED: |
567 | case OP_CB_NOTIFY_LOCK: | |
568 | return htonl(NFS4ERR_NOTSUPP); | |
569 | ||
570 | default: | |
571 | return htonl(NFS4ERR_OP_ILLEGAL); | |
572 | } | |
573 | ||
574 | return htonl(NFS_OK); | |
575 | } | |
576 | ||
577 | #else /* CONFIG_NFS_V4_1 */ | |
578 | ||
579 | static __be32 | |
580 | preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) | |
581 | { | |
582 | return htonl(NFS4ERR_MINOR_VERS_MISMATCH); | |
583 | } | |
584 | ||
585 | #endif /* CONFIG_NFS_V4_1 */ | |
586 | ||
587 | static __be32 | |
588 | preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) | |
589 | { | |
590 | switch (op_nr) { | |
591 | case OP_CB_GETATTR: | |
592 | case OP_CB_RECALL: | |
593 | *op = &callback_ops[op_nr]; | |
594 | break; | |
595 | default: | |
596 | return htonl(NFS4ERR_OP_ILLEGAL); | |
597 | } | |
598 | ||
599 | return htonl(NFS_OK); | |
600 | } | |
601 | ||
602 | static __be32 process_op(uint32_t minorversion, int nop, | |
603 | struct svc_rqst *rqstp, | |
1da177e4 LT |
604 | struct xdr_stream *xdr_in, void *argp, |
605 | struct xdr_stream *xdr_out, void *resp) | |
606 | { | |
a162a6b8 TM |
607 | struct callback_op *op = &callback_ops[0]; |
608 | unsigned int op_nr = OP_CB_ILLEGAL; | |
34bc47c9 | 609 | __be32 status; |
1da177e4 | 610 | long maxlen; |
e6f684f6 | 611 | __be32 res; |
1da177e4 | 612 | |
3110ff80 | 613 | dprintk("%s: start\n", __func__); |
1da177e4 | 614 | status = decode_op_hdr(xdr_in, &op_nr); |
34bc47c9 BH |
615 | if (unlikely(status)) { |
616 | status = htonl(NFS4ERR_OP_ILLEGAL); | |
617 | goto out; | |
a162a6b8 | 618 | } |
1da177e4 | 619 | |
34bc47c9 BH |
620 | dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", |
621 | __func__, minorversion, nop, op_nr); | |
622 | ||
623 | status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : | |
624 | preprocess_nfs4_op(op_nr, &op); | |
625 | if (status == htonl(NFS4ERR_OP_ILLEGAL)) | |
626 | op_nr = OP_CB_ILLEGAL; | |
627 | out: | |
1da177e4 LT |
628 | maxlen = xdr_out->end - xdr_out->p; |
629 | if (maxlen > 0 && maxlen < PAGE_SIZE) { | |
630 | if (likely(status == 0 && op->decode_args != NULL)) | |
631 | status = op->decode_args(rqstp, xdr_in, argp); | |
632 | if (likely(status == 0 && op->process_op != NULL)) | |
633 | status = op->process_op(argp, resp); | |
634 | } else | |
635 | status = htonl(NFS4ERR_RESOURCE); | |
636 | ||
637 | res = encode_op_hdr(xdr_out, op_nr, status); | |
638 | if (status == 0) | |
639 | status = res; | |
640 | if (op->encode_res != NULL && status == 0) | |
641 | status = op->encode_res(rqstp, xdr_out, resp); | |
3110ff80 | 642 | dprintk("%s: done, status = %d\n", __func__, ntohl(status)); |
1da177e4 LT |
643 | return status; |
644 | } | |
645 | ||
646 | /* | |
647 | * Decode, process and encode a COMPOUND | |
648 | */ | |
7111c66e | 649 | static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) |
1da177e4 | 650 | { |
3a6258e1 TM |
651 | struct cb_compound_hdr_arg hdr_arg = { 0 }; |
652 | struct cb_compound_hdr_res hdr_res = { NULL }; | |
1da177e4 | 653 | struct xdr_stream xdr_in, xdr_out; |
5704fdeb | 654 | __be32 *p; |
e6f684f6 | 655 | __be32 status; |
3a6258e1 | 656 | unsigned int nops = 0; |
1da177e4 | 657 | |
3110ff80 | 658 | dprintk("%s: start\n", __func__); |
1da177e4 LT |
659 | |
660 | xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); | |
661 | ||
5704fdeb | 662 | p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); |
1da177e4 LT |
663 | xdr_init_encode(&xdr_out, &rqstp->rq_res, p); |
664 | ||
3a6258e1 TM |
665 | status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); |
666 | if (status == __constant_htonl(NFS4ERR_RESOURCE)) | |
667 | return rpc_garbage_args; | |
668 | ||
1da177e4 LT |
669 | hdr_res.taglen = hdr_arg.taglen; |
670 | hdr_res.tag = hdr_arg.tag; | |
3a6258e1 TM |
671 | if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) |
672 | return rpc_system_err; | |
1da177e4 | 673 | |
3a6258e1 | 674 | while (status == 0 && nops != hdr_arg.nops) { |
34bc47c9 BH |
675 | status = process_op(hdr_arg.minorversion, nops, |
676 | rqstp, &xdr_in, argp, &xdr_out, resp); | |
1da177e4 LT |
677 | nops++; |
678 | } | |
3a6258e1 | 679 | |
1da177e4 LT |
680 | *hdr_res.status = status; |
681 | *hdr_res.nops = htonl(nops); | |
3110ff80 | 682 | dprintk("%s: done, status = %u\n", __func__, ntohl(status)); |
1da177e4 LT |
683 | return rpc_success; |
684 | } | |
685 | ||
686 | /* | |
687 | * Define NFS4 callback COMPOUND ops. | |
688 | */ | |
689 | static struct callback_op callback_ops[] = { | |
690 | [0] = { | |
691 | .res_maxsize = CB_OP_HDR_RES_MAXSZ, | |
692 | }, | |
693 | [OP_CB_GETATTR] = { | |
694 | .process_op = (callback_process_op_t)nfs4_callback_getattr, | |
695 | .decode_args = (callback_decode_arg_t)decode_getattr_args, | |
696 | .encode_res = (callback_encode_res_t)encode_getattr_res, | |
697 | .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, | |
698 | }, | |
699 | [OP_CB_RECALL] = { | |
700 | .process_op = (callback_process_op_t)nfs4_callback_recall, | |
701 | .decode_args = (callback_decode_arg_t)decode_recall_args, | |
702 | .res_maxsize = CB_OP_RECALL_RES_MAXSZ, | |
4aece6a1 BH |
703 | }, |
704 | #if defined(CONFIG_NFS_V4_1) | |
705 | [OP_CB_SEQUENCE] = { | |
706 | .process_op = (callback_process_op_t)nfs4_callback_sequence, | |
707 | .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, | |
708 | .encode_res = (callback_encode_res_t)encode_cb_sequence_res, | |
709 | .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, | |
710 | }, | |
31f09607 AB |
711 | [OP_CB_RECALL_ANY] = { |
712 | .process_op = (callback_process_op_t)nfs4_callback_recallany, | |
713 | .decode_args = (callback_decode_arg_t)decode_recallany_args, | |
714 | .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, | |
715 | }, | |
4aece6a1 | 716 | #endif /* CONFIG_NFS_V4_1 */ |
1da177e4 LT |
717 | }; |
718 | ||
719 | /* | |
720 | * Define NFS4 callback procedures | |
721 | */ | |
722 | static struct svc_procedure nfs4_callback_procedures1[] = { | |
723 | [CB_NULL] = { | |
724 | .pc_func = nfs4_callback_null, | |
725 | .pc_decode = (kxdrproc_t)nfs4_decode_void, | |
726 | .pc_encode = (kxdrproc_t)nfs4_encode_void, | |
727 | .pc_xdrressize = 1, | |
728 | }, | |
729 | [CB_COMPOUND] = { | |
730 | .pc_func = nfs4_callback_compound, | |
731 | .pc_encode = (kxdrproc_t)nfs4_encode_void, | |
732 | .pc_argsize = 256, | |
733 | .pc_ressize = 256, | |
734 | .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, | |
735 | } | |
736 | }; | |
737 | ||
738 | struct svc_version nfs4_callback_version1 = { | |
739 | .vs_vers = 1, | |
740 | .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), | |
741 | .vs_proc = nfs4_callback_procedures1, | |
742 | .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, | |
743 | .vs_dispatch = NULL, | |
744 | }; | |
745 | ||
07bccc2d AB |
746 | struct svc_version nfs4_callback_version4 = { |
747 | .vs_vers = 4, | |
748 | .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), | |
749 | .vs_proc = nfs4_callback_procedures1, | |
750 | .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, | |
751 | .vs_dispatch = NULL, | |
752 | }; |