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