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) |
b9efa1b2 | 27 | #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) |
4aece6a1 BH |
28 | #endif /* CONFIG_NFS_V4_1 */ |
29 | ||
1da177e4 LT |
30 | #define NFSDBG_FACILITY NFSDBG_CALLBACK |
31 | ||
31d2b435 AA |
32 | /* Internal error code */ |
33 | #define NFS4ERR_RESOURCE_HDR 11050 | |
34 | ||
e6f684f6 AV |
35 | typedef __be32 (*callback_process_op_t)(void *, void *); |
36 | typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); | |
37 | typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); | |
1da177e4 LT |
38 | |
39 | ||
40 | struct callback_op { | |
41 | callback_process_op_t process_op; | |
42 | callback_decode_arg_t decode_args; | |
43 | callback_encode_res_t encode_res; | |
44 | long res_maxsize; | |
45 | }; | |
46 | ||
47 | static struct callback_op callback_ops[]; | |
48 | ||
7111c66e | 49 | static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) |
1da177e4 LT |
50 | { |
51 | return htonl(NFS4_OK); | |
52 | } | |
53 | ||
5704fdeb | 54 | static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
1da177e4 LT |
55 | { |
56 | return xdr_argsize_check(rqstp, p); | |
57 | } | |
58 | ||
5704fdeb | 59 | static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
1da177e4 LT |
60 | { |
61 | return xdr_ressize_check(rqstp, p); | |
62 | } | |
63 | ||
5704fdeb | 64 | static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) |
1da177e4 | 65 | { |
5704fdeb | 66 | __be32 *p; |
1da177e4 LT |
67 | |
68 | p = xdr_inline_decode(xdr, nbytes); | |
69 | if (unlikely(p == NULL)) | |
70 | printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n"); | |
71 | return p; | |
72 | } | |
73 | ||
e6f684f6 | 74 | static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) |
1da177e4 | 75 | { |
5704fdeb | 76 | __be32 *p; |
1da177e4 LT |
77 | |
78 | p = read_buf(xdr, 4); | |
79 | if (unlikely(p == NULL)) | |
80 | return htonl(NFS4ERR_RESOURCE); | |
81 | *len = ntohl(*p); | |
82 | ||
83 | if (*len != 0) { | |
84 | p = read_buf(xdr, *len); | |
85 | if (unlikely(p == NULL)) | |
86 | return htonl(NFS4ERR_RESOURCE); | |
87 | *str = (const char *)p; | |
88 | } else | |
89 | *str = NULL; | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
e6f684f6 | 94 | static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) |
1da177e4 | 95 | { |
5704fdeb | 96 | __be32 *p; |
1da177e4 LT |
97 | |
98 | p = read_buf(xdr, 4); | |
99 | if (unlikely(p == NULL)) | |
100 | return htonl(NFS4ERR_RESOURCE); | |
101 | fh->size = ntohl(*p); | |
102 | if (fh->size > NFS4_FHSIZE) | |
103 | return htonl(NFS4ERR_BADHANDLE); | |
104 | p = read_buf(xdr, fh->size); | |
105 | if (unlikely(p == NULL)) | |
106 | return htonl(NFS4ERR_RESOURCE); | |
107 | memcpy(&fh->data[0], p, fh->size); | |
108 | memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); | |
109 | return 0; | |
110 | } | |
111 | ||
e6f684f6 | 112 | static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) |
1da177e4 | 113 | { |
5704fdeb | 114 | __be32 *p; |
1da177e4 LT |
115 | unsigned int attrlen; |
116 | ||
117 | p = read_buf(xdr, 4); | |
118 | if (unlikely(p == NULL)) | |
119 | return htonl(NFS4ERR_RESOURCE); | |
120 | attrlen = ntohl(*p); | |
121 | p = read_buf(xdr, attrlen << 2); | |
122 | if (unlikely(p == NULL)) | |
123 | return htonl(NFS4ERR_RESOURCE); | |
124 | if (likely(attrlen > 0)) | |
125 | bitmap[0] = ntohl(*p++); | |
126 | if (attrlen > 1) | |
127 | bitmap[1] = ntohl(*p); | |
128 | return 0; | |
129 | } | |
130 | ||
e6f684f6 | 131 | static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) |
1da177e4 | 132 | { |
5704fdeb | 133 | __be32 *p; |
1da177e4 LT |
134 | |
135 | p = read_buf(xdr, 16); | |
136 | if (unlikely(p == NULL)) | |
137 | return htonl(NFS4ERR_RESOURCE); | |
138 | memcpy(stateid->data, p, 16); | |
139 | return 0; | |
140 | } | |
141 | ||
e6f684f6 | 142 | static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) |
1da177e4 | 143 | { |
5704fdeb | 144 | __be32 *p; |
e6f684f6 | 145 | __be32 status; |
1da177e4 LT |
146 | |
147 | status = decode_string(xdr, &hdr->taglen, &hdr->tag); | |
148 | if (unlikely(status != 0)) | |
149 | return status; | |
150 | /* We do not like overly long tags! */ | |
5cce428d | 151 | if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { |
1da177e4 | 152 | printk("NFSv4 CALLBACK %s: client sent tag of length %u\n", |
3110ff80 | 153 | __func__, hdr->taglen); |
1da177e4 LT |
154 | return htonl(NFS4ERR_RESOURCE); |
155 | } | |
156 | p = read_buf(xdr, 12); | |
157 | if (unlikely(p == NULL)) | |
158 | return htonl(NFS4ERR_RESOURCE); | |
b8f2ef84 | 159 | hdr->minorversion = ntohl(*p++); |
48a9e2d2 BH |
160 | /* Check minor version is zero or one. */ |
161 | if (hdr->minorversion <= 1) { | |
162 | p++; /* skip callback_ident */ | |
163 | } else { | |
b8f2ef84 BH |
164 | printk(KERN_WARNING "%s: NFSv4 server callback with " |
165 | "illegal minor version %u!\n", | |
166 | __func__, hdr->minorversion); | |
1da177e4 LT |
167 | return htonl(NFS4ERR_MINOR_VERS_MISMATCH); |
168 | } | |
1da177e4 | 169 | hdr->nops = ntohl(*p); |
b8f2ef84 BH |
170 | dprintk("%s: minorversion %d nops %d\n", __func__, |
171 | hdr->minorversion, hdr->nops); | |
1da177e4 LT |
172 | return 0; |
173 | } | |
174 | ||
e6f684f6 | 175 | static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) |
1da177e4 | 176 | { |
5704fdeb | 177 | __be32 *p; |
1da177e4 LT |
178 | p = read_buf(xdr, 4); |
179 | if (unlikely(p == NULL)) | |
31d2b435 | 180 | return htonl(NFS4ERR_RESOURCE_HDR); |
1da177e4 LT |
181 | *op = ntohl(*p); |
182 | return 0; | |
183 | } | |
184 | ||
e6f684f6 | 185 | static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) |
1da177e4 | 186 | { |
e6f684f6 | 187 | __be32 status; |
1da177e4 LT |
188 | |
189 | status = decode_fh(xdr, &args->fh); | |
190 | if (unlikely(status != 0)) | |
191 | goto out; | |
671beed7 | 192 | args->addr = svc_addr(rqstp); |
1da177e4 LT |
193 | status = decode_bitmap(xdr, args->bitmap); |
194 | out: | |
3110ff80 | 195 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
1da177e4 LT |
196 | return status; |
197 | } | |
198 | ||
e6f684f6 | 199 | static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) |
1da177e4 | 200 | { |
5704fdeb | 201 | __be32 *p; |
e6f684f6 | 202 | __be32 status; |
1da177e4 | 203 | |
c1d35866 | 204 | args->addr = svc_addr(rqstp); |
1da177e4 LT |
205 | status = decode_stateid(xdr, &args->stateid); |
206 | if (unlikely(status != 0)) | |
207 | goto out; | |
208 | p = read_buf(xdr, 4); | |
209 | if (unlikely(p == NULL)) { | |
210 | status = htonl(NFS4ERR_RESOURCE); | |
211 | goto out; | |
212 | } | |
213 | args->truncate = ntohl(*p); | |
214 | status = decode_fh(xdr, &args->fh); | |
215 | out: | |
3110ff80 | 216 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
3873bc50 | 217 | return status; |
1da177e4 LT |
218 | } |
219 | ||
4aece6a1 BH |
220 | #if defined(CONFIG_NFS_V4_1) |
221 | ||
9733f0d9 | 222 | static __be32 decode_sessionid(struct xdr_stream *xdr, |
4aece6a1 BH |
223 | struct nfs4_sessionid *sid) |
224 | { | |
9733f0d9 | 225 | __be32 *p; |
4aece6a1 BH |
226 | int len = NFS4_MAX_SESSIONID_LEN; |
227 | ||
228 | p = read_buf(xdr, len); | |
229 | if (unlikely(p == NULL)) | |
a419aef8 | 230 | return htonl(NFS4ERR_RESOURCE); |
4aece6a1 BH |
231 | |
232 | memcpy(sid->data, p, len); | |
233 | return 0; | |
234 | } | |
235 | ||
9733f0d9 | 236 | static __be32 decode_rc_list(struct xdr_stream *xdr, |
4aece6a1 BH |
237 | struct referring_call_list *rc_list) |
238 | { | |
9733f0d9 | 239 | __be32 *p; |
4aece6a1 | 240 | int i; |
9733f0d9 | 241 | __be32 status; |
4aece6a1 BH |
242 | |
243 | status = decode_sessionid(xdr, &rc_list->rcl_sessionid); | |
244 | if (status) | |
245 | goto out; | |
246 | ||
247 | status = htonl(NFS4ERR_RESOURCE); | |
248 | p = read_buf(xdr, sizeof(uint32_t)); | |
249 | if (unlikely(p == NULL)) | |
250 | goto out; | |
251 | ||
252 | rc_list->rcl_nrefcalls = ntohl(*p++); | |
253 | if (rc_list->rcl_nrefcalls) { | |
254 | p = read_buf(xdr, | |
255 | rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); | |
256 | if (unlikely(p == NULL)) | |
257 | goto out; | |
258 | rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * | |
259 | sizeof(*rc_list->rcl_refcalls), | |
260 | GFP_KERNEL); | |
261 | if (unlikely(rc_list->rcl_refcalls == NULL)) | |
262 | goto out; | |
263 | for (i = 0; i < rc_list->rcl_nrefcalls; i++) { | |
264 | rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); | |
265 | rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); | |
266 | } | |
267 | } | |
268 | status = 0; | |
269 | ||
270 | out: | |
271 | return status; | |
272 | } | |
273 | ||
9733f0d9 | 274 | static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, |
4aece6a1 BH |
275 | struct xdr_stream *xdr, |
276 | struct cb_sequenceargs *args) | |
277 | { | |
9733f0d9 | 278 | __be32 *p; |
4aece6a1 | 279 | int i; |
9733f0d9 | 280 | __be32 status; |
4aece6a1 BH |
281 | |
282 | status = decode_sessionid(xdr, &args->csa_sessionid); | |
283 | if (status) | |
284 | goto out; | |
285 | ||
286 | status = htonl(NFS4ERR_RESOURCE); | |
287 | p = read_buf(xdr, 5 * sizeof(uint32_t)); | |
288 | if (unlikely(p == NULL)) | |
289 | goto out; | |
290 | ||
65fc64e5 | 291 | args->csa_addr = svc_addr(rqstp); |
4aece6a1 BH |
292 | args->csa_sequenceid = ntohl(*p++); |
293 | args->csa_slotid = ntohl(*p++); | |
294 | args->csa_highestslotid = ntohl(*p++); | |
295 | args->csa_cachethis = ntohl(*p++); | |
296 | args->csa_nrclists = ntohl(*p++); | |
297 | args->csa_rclists = NULL; | |
298 | if (args->csa_nrclists) { | |
299 | args->csa_rclists = kmalloc(args->csa_nrclists * | |
300 | sizeof(*args->csa_rclists), | |
301 | GFP_KERNEL); | |
302 | if (unlikely(args->csa_rclists == NULL)) | |
303 | goto out; | |
304 | ||
305 | for (i = 0; i < args->csa_nrclists; i++) { | |
306 | status = decode_rc_list(xdr, &args->csa_rclists[i]); | |
307 | if (status) | |
308 | goto out_free; | |
309 | } | |
310 | } | |
311 | status = 0; | |
312 | ||
313 | dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " | |
314 | "highestslotid %u cachethis %d nrclists %u\n", | |
315 | __func__, | |
316 | ((u32 *)&args->csa_sessionid)[0], | |
317 | ((u32 *)&args->csa_sessionid)[1], | |
318 | ((u32 *)&args->csa_sessionid)[2], | |
319 | ((u32 *)&args->csa_sessionid)[3], | |
320 | args->csa_sequenceid, args->csa_slotid, | |
321 | args->csa_highestslotid, args->csa_cachethis, | |
322 | args->csa_nrclists); | |
323 | out: | |
324 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
325 | return status; | |
326 | ||
327 | out_free: | |
328 | for (i = 0; i < args->csa_nrclists; i++) | |
329 | kfree(args->csa_rclists[i].rcl_refcalls); | |
330 | kfree(args->csa_rclists); | |
331 | goto out; | |
332 | } | |
333 | ||
9733f0d9 | 334 | static __be32 decode_recallany_args(struct svc_rqst *rqstp, |
31f09607 AB |
335 | struct xdr_stream *xdr, |
336 | struct cb_recallanyargs *args) | |
337 | { | |
9733f0d9 | 338 | __be32 *p; |
31f09607 AB |
339 | |
340 | args->craa_addr = svc_addr(rqstp); | |
341 | p = read_buf(xdr, 4); | |
342 | if (unlikely(p == NULL)) | |
343 | return htonl(NFS4ERR_BADXDR); | |
344 | args->craa_objs_to_keep = ntohl(*p++); | |
345 | p = read_buf(xdr, 4); | |
346 | if (unlikely(p == NULL)) | |
347 | return htonl(NFS4ERR_BADXDR); | |
348 | args->craa_type_mask = ntohl(*p); | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
9733f0d9 | 353 | static __be32 decode_recallslot_args(struct svc_rqst *rqstp, |
b9efa1b2 AA |
354 | struct xdr_stream *xdr, |
355 | struct cb_recallslotargs *args) | |
356 | { | |
357 | __be32 *p; | |
358 | ||
359 | args->crsa_addr = svc_addr(rqstp); | |
360 | p = read_buf(xdr, 4); | |
361 | if (unlikely(p == NULL)) | |
362 | return htonl(NFS4ERR_BADXDR); | |
363 | args->crsa_target_max_slots = ntohl(*p++); | |
364 | return 0; | |
365 | } | |
366 | ||
4aece6a1 BH |
367 | #endif /* CONFIG_NFS_V4_1 */ |
368 | ||
e6f684f6 | 369 | static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) |
1da177e4 | 370 | { |
5704fdeb | 371 | __be32 *p; |
1da177e4 LT |
372 | |
373 | p = xdr_reserve_space(xdr, 4 + len); | |
374 | if (unlikely(p == NULL)) | |
375 | return htonl(NFS4ERR_RESOURCE); | |
376 | xdr_encode_opaque(p, str, len); | |
377 | return 0; | |
378 | } | |
379 | ||
380 | #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) | |
381 | #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) | |
5704fdeb | 382 | static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) |
1da177e4 | 383 | { |
5704fdeb AV |
384 | __be32 bm[2]; |
385 | __be32 *p; | |
1da177e4 LT |
386 | |
387 | bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); | |
388 | bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); | |
389 | if (bm[1] != 0) { | |
390 | p = xdr_reserve_space(xdr, 16); | |
391 | if (unlikely(p == NULL)) | |
392 | return htonl(NFS4ERR_RESOURCE); | |
393 | *p++ = htonl(2); | |
394 | *p++ = bm[0]; | |
395 | *p++ = bm[1]; | |
396 | } else if (bm[0] != 0) { | |
397 | p = xdr_reserve_space(xdr, 12); | |
398 | if (unlikely(p == NULL)) | |
399 | return htonl(NFS4ERR_RESOURCE); | |
400 | *p++ = htonl(1); | |
401 | *p++ = bm[0]; | |
402 | } else { | |
403 | p = xdr_reserve_space(xdr, 8); | |
404 | if (unlikely(p == NULL)) | |
405 | return htonl(NFS4ERR_RESOURCE); | |
406 | *p++ = htonl(0); | |
407 | } | |
408 | *savep = p; | |
409 | return 0; | |
410 | } | |
411 | ||
e6f684f6 | 412 | static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) |
1da177e4 | 413 | { |
5704fdeb | 414 | __be32 *p; |
1da177e4 LT |
415 | |
416 | if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) | |
417 | return 0; | |
418 | p = xdr_reserve_space(xdr, 8); | |
90dc7d27 | 419 | if (unlikely(!p)) |
1da177e4 LT |
420 | return htonl(NFS4ERR_RESOURCE); |
421 | p = xdr_encode_hyper(p, change); | |
422 | return 0; | |
423 | } | |
424 | ||
e6f684f6 | 425 | static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) |
1da177e4 | 426 | { |
5704fdeb | 427 | __be32 *p; |
1da177e4 LT |
428 | |
429 | if (!(bitmap[0] & FATTR4_WORD0_SIZE)) | |
430 | return 0; | |
431 | p = xdr_reserve_space(xdr, 8); | |
90dc7d27 | 432 | if (unlikely(!p)) |
1da177e4 LT |
433 | return htonl(NFS4ERR_RESOURCE); |
434 | p = xdr_encode_hyper(p, size); | |
435 | return 0; | |
436 | } | |
437 | ||
e6f684f6 | 438 | static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) |
1da177e4 | 439 | { |
5704fdeb | 440 | __be32 *p; |
1da177e4 LT |
441 | |
442 | p = xdr_reserve_space(xdr, 12); | |
90dc7d27 | 443 | if (unlikely(!p)) |
1da177e4 LT |
444 | return htonl(NFS4ERR_RESOURCE); |
445 | p = xdr_encode_hyper(p, time->tv_sec); | |
446 | *p = htonl(time->tv_nsec); | |
447 | return 0; | |
448 | } | |
449 | ||
e6f684f6 | 450 | static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) |
1da177e4 LT |
451 | { |
452 | if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) | |
453 | return 0; | |
454 | return encode_attr_time(xdr,time); | |
455 | } | |
456 | ||
e6f684f6 | 457 | static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) |
1da177e4 LT |
458 | { |
459 | if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) | |
460 | return 0; | |
461 | return encode_attr_time(xdr,time); | |
462 | } | |
463 | ||
e6f684f6 | 464 | static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) |
1da177e4 | 465 | { |
e6f684f6 | 466 | __be32 status; |
1da177e4 LT |
467 | |
468 | hdr->status = xdr_reserve_space(xdr, 4); | |
469 | if (unlikely(hdr->status == NULL)) | |
470 | return htonl(NFS4ERR_RESOURCE); | |
471 | status = encode_string(xdr, hdr->taglen, hdr->tag); | |
472 | if (unlikely(status != 0)) | |
473 | return status; | |
474 | hdr->nops = xdr_reserve_space(xdr, 4); | |
475 | if (unlikely(hdr->nops == NULL)) | |
476 | return htonl(NFS4ERR_RESOURCE); | |
477 | return 0; | |
478 | } | |
479 | ||
e6f684f6 | 480 | static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) |
1da177e4 | 481 | { |
5704fdeb | 482 | __be32 *p; |
1da177e4 LT |
483 | |
484 | p = xdr_reserve_space(xdr, 8); | |
485 | if (unlikely(p == NULL)) | |
31d2b435 | 486 | return htonl(NFS4ERR_RESOURCE_HDR); |
1da177e4 LT |
487 | *p++ = htonl(op); |
488 | *p = res; | |
489 | return 0; | |
490 | } | |
491 | ||
e6f684f6 | 492 | static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) |
1da177e4 | 493 | { |
5704fdeb | 494 | __be32 *savep = NULL; |
e6f684f6 | 495 | __be32 status = res->status; |
1da177e4 LT |
496 | |
497 | if (unlikely(status != 0)) | |
498 | goto out; | |
499 | status = encode_attr_bitmap(xdr, res->bitmap, &savep); | |
500 | if (unlikely(status != 0)) | |
501 | goto out; | |
502 | status = encode_attr_change(xdr, res->bitmap, res->change_attr); | |
503 | if (unlikely(status != 0)) | |
504 | goto out; | |
505 | status = encode_attr_size(xdr, res->bitmap, res->size); | |
506 | if (unlikely(status != 0)) | |
507 | goto out; | |
508 | status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); | |
509 | if (unlikely(status != 0)) | |
510 | goto out; | |
511 | status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); | |
512 | *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); | |
513 | out: | |
3110ff80 | 514 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
1da177e4 LT |
515 | return status; |
516 | } | |
517 | ||
34bc47c9 BH |
518 | #if defined(CONFIG_NFS_V4_1) |
519 | ||
9733f0d9 | 520 | static __be32 encode_sessionid(struct xdr_stream *xdr, |
4aece6a1 BH |
521 | const struct nfs4_sessionid *sid) |
522 | { | |
9733f0d9 | 523 | __be32 *p; |
4aece6a1 BH |
524 | int len = NFS4_MAX_SESSIONID_LEN; |
525 | ||
526 | p = xdr_reserve_space(xdr, len); | |
527 | if (unlikely(p == NULL)) | |
528 | return htonl(NFS4ERR_RESOURCE); | |
529 | ||
530 | memcpy(p, sid, len); | |
531 | return 0; | |
532 | } | |
533 | ||
9733f0d9 | 534 | static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, |
4aece6a1 BH |
535 | struct xdr_stream *xdr, |
536 | const struct cb_sequenceres *res) | |
537 | { | |
9733f0d9 | 538 | __be32 *p; |
4aece6a1 BH |
539 | unsigned status = res->csr_status; |
540 | ||
541 | if (unlikely(status != 0)) | |
542 | goto out; | |
543 | ||
544 | encode_sessionid(xdr, &res->csr_sessionid); | |
545 | ||
546 | p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); | |
547 | if (unlikely(p == NULL)) | |
548 | return htonl(NFS4ERR_RESOURCE); | |
549 | ||
550 | *p++ = htonl(res->csr_sequenceid); | |
551 | *p++ = htonl(res->csr_slotid); | |
552 | *p++ = htonl(res->csr_highestslotid); | |
553 | *p++ = htonl(res->csr_target_highestslotid); | |
554 | out: | |
555 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
556 | return status; | |
557 | } | |
558 | ||
34bc47c9 BH |
559 | static __be32 |
560 | preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) | |
561 | { | |
281fe15d BH |
562 | if (op_nr == OP_CB_SEQUENCE) { |
563 | if (nop != 0) | |
564 | return htonl(NFS4ERR_SEQUENCE_POS); | |
565 | } else { | |
566 | if (nop == 0) | |
567 | return htonl(NFS4ERR_OP_NOT_IN_SESSION); | |
568 | } | |
569 | ||
34bc47c9 BH |
570 | switch (op_nr) { |
571 | case OP_CB_GETATTR: | |
572 | case OP_CB_RECALL: | |
4aece6a1 | 573 | case OP_CB_SEQUENCE: |
31f09607 | 574 | case OP_CB_RECALL_ANY: |
b9efa1b2 | 575 | case OP_CB_RECALL_SLOT: |
34bc47c9 BH |
576 | *op = &callback_ops[op_nr]; |
577 | break; | |
578 | ||
579 | case OP_CB_LAYOUTRECALL: | |
580 | case OP_CB_NOTIFY_DEVICEID: | |
581 | case OP_CB_NOTIFY: | |
582 | case OP_CB_PUSH_DELEG: | |
34bc47c9 | 583 | case OP_CB_RECALLABLE_OBJ_AVAIL: |
34bc47c9 BH |
584 | case OP_CB_WANTS_CANCELLED: |
585 | case OP_CB_NOTIFY_LOCK: | |
586 | return htonl(NFS4ERR_NOTSUPP); | |
587 | ||
588 | default: | |
589 | return htonl(NFS4ERR_OP_ILLEGAL); | |
590 | } | |
591 | ||
592 | return htonl(NFS_OK); | |
593 | } | |
594 | ||
595 | #else /* CONFIG_NFS_V4_1 */ | |
596 | ||
597 | static __be32 | |
598 | preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) | |
599 | { | |
600 | return htonl(NFS4ERR_MINOR_VERS_MISMATCH); | |
601 | } | |
602 | ||
603 | #endif /* CONFIG_NFS_V4_1 */ | |
604 | ||
605 | static __be32 | |
606 | preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) | |
607 | { | |
608 | switch (op_nr) { | |
609 | case OP_CB_GETATTR: | |
610 | case OP_CB_RECALL: | |
611 | *op = &callback_ops[op_nr]; | |
612 | break; | |
613 | default: | |
614 | return htonl(NFS4ERR_OP_ILLEGAL); | |
615 | } | |
616 | ||
617 | return htonl(NFS_OK); | |
618 | } | |
619 | ||
620 | static __be32 process_op(uint32_t minorversion, int nop, | |
621 | struct svc_rqst *rqstp, | |
1da177e4 | 622 | struct xdr_stream *xdr_in, void *argp, |
4911096f | 623 | struct xdr_stream *xdr_out, void *resp, int* drc_status) |
1da177e4 | 624 | { |
a162a6b8 | 625 | struct callback_op *op = &callback_ops[0]; |
31d2b435 | 626 | unsigned int op_nr; |
34bc47c9 | 627 | __be32 status; |
1da177e4 | 628 | long maxlen; |
e6f684f6 | 629 | __be32 res; |
1da177e4 | 630 | |
3110ff80 | 631 | dprintk("%s: start\n", __func__); |
1da177e4 | 632 | status = decode_op_hdr(xdr_in, &op_nr); |
31d2b435 AA |
633 | if (unlikely(status)) |
634 | return status; | |
1da177e4 | 635 | |
34bc47c9 BH |
636 | dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", |
637 | __func__, minorversion, nop, op_nr); | |
638 | ||
639 | status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : | |
640 | preprocess_nfs4_op(op_nr, &op); | |
641 | if (status == htonl(NFS4ERR_OP_ILLEGAL)) | |
642 | op_nr = OP_CB_ILLEGAL; | |
b92b3019 AA |
643 | if (status) |
644 | goto encode_hdr; | |
31d2b435 | 645 | |
4911096f AA |
646 | if (*drc_status) { |
647 | status = *drc_status; | |
648 | goto encode_hdr; | |
649 | } | |
650 | ||
1da177e4 LT |
651 | maxlen = xdr_out->end - xdr_out->p; |
652 | if (maxlen > 0 && maxlen < PAGE_SIZE) { | |
e95e60da AA |
653 | status = op->decode_args(rqstp, xdr_in, argp); |
654 | if (likely(status == 0)) | |
1da177e4 LT |
655 | status = op->process_op(argp, resp); |
656 | } else | |
657 | status = htonl(NFS4ERR_RESOURCE); | |
658 | ||
4911096f AA |
659 | /* Only set by OP_CB_SEQUENCE processing */ |
660 | if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { | |
661 | *drc_status = status; | |
662 | status = 0; | |
663 | } | |
664 | ||
b92b3019 | 665 | encode_hdr: |
1da177e4 | 666 | res = encode_op_hdr(xdr_out, op_nr, status); |
31d2b435 AA |
667 | if (unlikely(res)) |
668 | return res; | |
1da177e4 LT |
669 | if (op->encode_res != NULL && status == 0) |
670 | status = op->encode_res(rqstp, xdr_out, resp); | |
3110ff80 | 671 | dprintk("%s: done, status = %d\n", __func__, ntohl(status)); |
1da177e4 LT |
672 | return status; |
673 | } | |
674 | ||
675 | /* | |
676 | * Decode, process and encode a COMPOUND | |
677 | */ | |
7111c66e | 678 | static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) |
1da177e4 | 679 | { |
3a6258e1 TM |
680 | struct cb_compound_hdr_arg hdr_arg = { 0 }; |
681 | struct cb_compound_hdr_res hdr_res = { NULL }; | |
1da177e4 | 682 | struct xdr_stream xdr_in, xdr_out; |
5704fdeb | 683 | __be32 *p; |
4911096f | 684 | __be32 status, drc_status = 0; |
3a6258e1 | 685 | unsigned int nops = 0; |
1da177e4 | 686 | |
3110ff80 | 687 | dprintk("%s: start\n", __func__); |
1da177e4 LT |
688 | |
689 | xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); | |
690 | ||
5704fdeb | 691 | p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); |
1da177e4 LT |
692 | xdr_init_encode(&xdr_out, &rqstp->rq_res, p); |
693 | ||
3a6258e1 TM |
694 | status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); |
695 | if (status == __constant_htonl(NFS4ERR_RESOURCE)) | |
696 | return rpc_garbage_args; | |
697 | ||
1da177e4 LT |
698 | hdr_res.taglen = hdr_arg.taglen; |
699 | hdr_res.tag = hdr_arg.tag; | |
3a6258e1 TM |
700 | if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) |
701 | return rpc_system_err; | |
1da177e4 | 702 | |
3a6258e1 | 703 | while (status == 0 && nops != hdr_arg.nops) { |
4911096f AA |
704 | status = process_op(hdr_arg.minorversion, nops, rqstp, |
705 | &xdr_in, argp, &xdr_out, resp, &drc_status); | |
1da177e4 LT |
706 | nops++; |
707 | } | |
3a6258e1 | 708 | |
31d2b435 AA |
709 | /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return |
710 | * resource error in cb_compound status without returning op */ | |
711 | if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { | |
712 | status = htonl(NFS4ERR_RESOURCE); | |
713 | nops--; | |
714 | } | |
715 | ||
1da177e4 LT |
716 | *hdr_res.status = status; |
717 | *hdr_res.nops = htonl(nops); | |
3110ff80 | 718 | dprintk("%s: done, status = %u\n", __func__, ntohl(status)); |
1da177e4 LT |
719 | return rpc_success; |
720 | } | |
721 | ||
722 | /* | |
723 | * Define NFS4 callback COMPOUND ops. | |
724 | */ | |
725 | static struct callback_op callback_ops[] = { | |
726 | [0] = { | |
727 | .res_maxsize = CB_OP_HDR_RES_MAXSZ, | |
728 | }, | |
729 | [OP_CB_GETATTR] = { | |
730 | .process_op = (callback_process_op_t)nfs4_callback_getattr, | |
731 | .decode_args = (callback_decode_arg_t)decode_getattr_args, | |
732 | .encode_res = (callback_encode_res_t)encode_getattr_res, | |
733 | .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, | |
734 | }, | |
735 | [OP_CB_RECALL] = { | |
736 | .process_op = (callback_process_op_t)nfs4_callback_recall, | |
737 | .decode_args = (callback_decode_arg_t)decode_recall_args, | |
738 | .res_maxsize = CB_OP_RECALL_RES_MAXSZ, | |
4aece6a1 BH |
739 | }, |
740 | #if defined(CONFIG_NFS_V4_1) | |
741 | [OP_CB_SEQUENCE] = { | |
742 | .process_op = (callback_process_op_t)nfs4_callback_sequence, | |
743 | .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, | |
744 | .encode_res = (callback_encode_res_t)encode_cb_sequence_res, | |
745 | .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, | |
746 | }, | |
31f09607 AB |
747 | [OP_CB_RECALL_ANY] = { |
748 | .process_op = (callback_process_op_t)nfs4_callback_recallany, | |
749 | .decode_args = (callback_decode_arg_t)decode_recallany_args, | |
750 | .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, | |
751 | }, | |
b9efa1b2 AA |
752 | [OP_CB_RECALL_SLOT] = { |
753 | .process_op = (callback_process_op_t)nfs4_callback_recallslot, | |
754 | .decode_args = (callback_decode_arg_t)decode_recallslot_args, | |
755 | .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, | |
756 | }, | |
4aece6a1 | 757 | #endif /* CONFIG_NFS_V4_1 */ |
1da177e4 LT |
758 | }; |
759 | ||
760 | /* | |
761 | * Define NFS4 callback procedures | |
762 | */ | |
763 | static struct svc_procedure nfs4_callback_procedures1[] = { | |
764 | [CB_NULL] = { | |
765 | .pc_func = nfs4_callback_null, | |
766 | .pc_decode = (kxdrproc_t)nfs4_decode_void, | |
767 | .pc_encode = (kxdrproc_t)nfs4_encode_void, | |
768 | .pc_xdrressize = 1, | |
769 | }, | |
770 | [CB_COMPOUND] = { | |
771 | .pc_func = nfs4_callback_compound, | |
772 | .pc_encode = (kxdrproc_t)nfs4_encode_void, | |
773 | .pc_argsize = 256, | |
774 | .pc_ressize = 256, | |
775 | .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, | |
776 | } | |
777 | }; | |
778 | ||
779 | struct svc_version nfs4_callback_version1 = { | |
780 | .vs_vers = 1, | |
781 | .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), | |
782 | .vs_proc = nfs4_callback_procedures1, | |
783 | .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, | |
784 | .vs_dispatch = NULL, | |
49697ee7 | 785 | .vs_hidden = 1, |
1da177e4 LT |
786 | }; |
787 | ||
07bccc2d AB |
788 | struct svc_version nfs4_callback_version4 = { |
789 | .vs_vers = 4, | |
790 | .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), | |
791 | .vs_proc = nfs4_callback_procedures1, | |
792 | .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, | |
793 | .vs_dispatch = NULL, | |
794 | }; |