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> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
4ce79717 | 13 | #include "nfs4_fs.h" |
1da177e4 LT |
14 | #include "callback.h" |
15 | ||
16 | #define CB_OP_TAGLEN_MAXSZ (512) | |
17 | #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ) | |
18 | #define CB_OP_GETATTR_BITMAP_MAXSZ (4) | |
19 | #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ | |
20 | CB_OP_GETATTR_BITMAP_MAXSZ + \ | |
21 | 2 + 2 + 3 + 3) | |
22 | #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) | |
23 | ||
4aece6a1 BH |
24 | #if defined(CONFIG_NFS_V4_1) |
25 | #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ | |
26 | 4 + 1 + 3) | |
31f09607 | 27 | #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) |
b9efa1b2 | 28 | #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) |
4aece6a1 BH |
29 | #endif /* CONFIG_NFS_V4_1 */ |
30 | ||
1da177e4 LT |
31 | #define NFSDBG_FACILITY NFSDBG_CALLBACK |
32 | ||
31d2b435 AA |
33 | /* Internal error code */ |
34 | #define NFS4ERR_RESOURCE_HDR 11050 | |
35 | ||
e6f684f6 AV |
36 | typedef __be32 (*callback_process_op_t)(void *, void *); |
37 | typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); | |
38 | typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); | |
1da177e4 LT |
39 | |
40 | ||
41 | struct callback_op { | |
42 | callback_process_op_t process_op; | |
43 | callback_decode_arg_t decode_args; | |
44 | callback_encode_res_t encode_res; | |
45 | long res_maxsize; | |
46 | }; | |
47 | ||
48 | static struct callback_op callback_ops[]; | |
49 | ||
7111c66e | 50 | static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) |
1da177e4 LT |
51 | { |
52 | return htonl(NFS4_OK); | |
53 | } | |
54 | ||
5704fdeb | 55 | static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
1da177e4 LT |
56 | { |
57 | return xdr_argsize_check(rqstp, p); | |
58 | } | |
59 | ||
5704fdeb | 60 | static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
1da177e4 LT |
61 | { |
62 | return xdr_ressize_check(rqstp, p); | |
63 | } | |
64 | ||
5704fdeb | 65 | static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) |
1da177e4 | 66 | { |
5704fdeb | 67 | __be32 *p; |
1da177e4 LT |
68 | |
69 | p = xdr_inline_decode(xdr, nbytes); | |
70 | if (unlikely(p == NULL)) | |
71 | printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n"); | |
72 | return p; | |
73 | } | |
74 | ||
e6f684f6 | 75 | static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) |
1da177e4 | 76 | { |
5704fdeb | 77 | __be32 *p; |
1da177e4 LT |
78 | |
79 | p = read_buf(xdr, 4); | |
80 | if (unlikely(p == NULL)) | |
81 | return htonl(NFS4ERR_RESOURCE); | |
82 | *len = ntohl(*p); | |
83 | ||
84 | if (*len != 0) { | |
85 | p = read_buf(xdr, *len); | |
86 | if (unlikely(p == NULL)) | |
87 | return htonl(NFS4ERR_RESOURCE); | |
88 | *str = (const char *)p; | |
89 | } else | |
90 | *str = NULL; | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
e6f684f6 | 95 | static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) |
1da177e4 | 96 | { |
5704fdeb | 97 | __be32 *p; |
1da177e4 LT |
98 | |
99 | p = read_buf(xdr, 4); | |
100 | if (unlikely(p == NULL)) | |
101 | return htonl(NFS4ERR_RESOURCE); | |
102 | fh->size = ntohl(*p); | |
103 | if (fh->size > NFS4_FHSIZE) | |
104 | return htonl(NFS4ERR_BADHANDLE); | |
105 | p = read_buf(xdr, fh->size); | |
106 | if (unlikely(p == NULL)) | |
107 | return htonl(NFS4ERR_RESOURCE); | |
108 | memcpy(&fh->data[0], p, fh->size); | |
109 | memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); | |
110 | return 0; | |
111 | } | |
112 | ||
e6f684f6 | 113 | static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) |
1da177e4 | 114 | { |
5704fdeb | 115 | __be32 *p; |
1da177e4 LT |
116 | unsigned int attrlen; |
117 | ||
118 | p = read_buf(xdr, 4); | |
119 | if (unlikely(p == NULL)) | |
120 | return htonl(NFS4ERR_RESOURCE); | |
121 | attrlen = ntohl(*p); | |
122 | p = read_buf(xdr, attrlen << 2); | |
123 | if (unlikely(p == NULL)) | |
124 | return htonl(NFS4ERR_RESOURCE); | |
125 | if (likely(attrlen > 0)) | |
126 | bitmap[0] = ntohl(*p++); | |
127 | if (attrlen > 1) | |
128 | bitmap[1] = ntohl(*p); | |
129 | return 0; | |
130 | } | |
131 | ||
e6f684f6 | 132 | static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) |
1da177e4 | 133 | { |
5704fdeb | 134 | __be32 *p; |
1da177e4 LT |
135 | |
136 | p = read_buf(xdr, 16); | |
137 | if (unlikely(p == NULL)) | |
138 | return htonl(NFS4ERR_RESOURCE); | |
139 | memcpy(stateid->data, p, 16); | |
140 | return 0; | |
141 | } | |
142 | ||
e6f684f6 | 143 | static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) |
1da177e4 | 144 | { |
5704fdeb | 145 | __be32 *p; |
e6f684f6 | 146 | __be32 status; |
1da177e4 LT |
147 | |
148 | status = decode_string(xdr, &hdr->taglen, &hdr->tag); | |
149 | if (unlikely(status != 0)) | |
150 | return status; | |
151 | /* We do not like overly long tags! */ | |
5cce428d | 152 | if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { |
1da177e4 | 153 | printk("NFSv4 CALLBACK %s: client sent tag of length %u\n", |
3110ff80 | 154 | __func__, hdr->taglen); |
1da177e4 LT |
155 | return htonl(NFS4ERR_RESOURCE); |
156 | } | |
157 | p = read_buf(xdr, 12); | |
158 | if (unlikely(p == NULL)) | |
159 | return htonl(NFS4ERR_RESOURCE); | |
b8f2ef84 | 160 | hdr->minorversion = ntohl(*p++); |
48a9e2d2 BH |
161 | /* Check minor version is zero or one. */ |
162 | if (hdr->minorversion <= 1) { | |
163 | p++; /* skip callback_ident */ | |
164 | } else { | |
b8f2ef84 BH |
165 | printk(KERN_WARNING "%s: NFSv4 server callback with " |
166 | "illegal minor version %u!\n", | |
167 | __func__, hdr->minorversion); | |
1da177e4 LT |
168 | return htonl(NFS4ERR_MINOR_VERS_MISMATCH); |
169 | } | |
1da177e4 | 170 | hdr->nops = ntohl(*p); |
b8f2ef84 BH |
171 | dprintk("%s: minorversion %d nops %d\n", __func__, |
172 | hdr->minorversion, hdr->nops); | |
1da177e4 LT |
173 | return 0; |
174 | } | |
175 | ||
e6f684f6 | 176 | static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) |
1da177e4 | 177 | { |
5704fdeb | 178 | __be32 *p; |
1da177e4 LT |
179 | p = read_buf(xdr, 4); |
180 | if (unlikely(p == NULL)) | |
31d2b435 | 181 | return htonl(NFS4ERR_RESOURCE_HDR); |
1da177e4 LT |
182 | *op = ntohl(*p); |
183 | return 0; | |
184 | } | |
185 | ||
e6f684f6 | 186 | static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) |
1da177e4 | 187 | { |
e6f684f6 | 188 | __be32 status; |
1da177e4 LT |
189 | |
190 | status = decode_fh(xdr, &args->fh); | |
191 | if (unlikely(status != 0)) | |
192 | goto out; | |
671beed7 | 193 | args->addr = svc_addr(rqstp); |
1da177e4 LT |
194 | status = decode_bitmap(xdr, args->bitmap); |
195 | out: | |
3110ff80 | 196 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
1da177e4 LT |
197 | return status; |
198 | } | |
199 | ||
e6f684f6 | 200 | static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) |
1da177e4 | 201 | { |
5704fdeb | 202 | __be32 *p; |
e6f684f6 | 203 | __be32 status; |
1da177e4 | 204 | |
c1d35866 | 205 | args->addr = svc_addr(rqstp); |
1da177e4 LT |
206 | status = decode_stateid(xdr, &args->stateid); |
207 | if (unlikely(status != 0)) | |
208 | goto out; | |
209 | p = read_buf(xdr, 4); | |
210 | if (unlikely(p == NULL)) { | |
211 | status = htonl(NFS4ERR_RESOURCE); | |
212 | goto out; | |
213 | } | |
214 | args->truncate = ntohl(*p); | |
215 | status = decode_fh(xdr, &args->fh); | |
216 | out: | |
3110ff80 | 217 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
3873bc50 | 218 | return status; |
1da177e4 LT |
219 | } |
220 | ||
4aece6a1 BH |
221 | #if defined(CONFIG_NFS_V4_1) |
222 | ||
9733f0d9 | 223 | static __be32 decode_sessionid(struct xdr_stream *xdr, |
4aece6a1 BH |
224 | struct nfs4_sessionid *sid) |
225 | { | |
9733f0d9 | 226 | __be32 *p; |
4aece6a1 BH |
227 | int len = NFS4_MAX_SESSIONID_LEN; |
228 | ||
229 | p = read_buf(xdr, len); | |
230 | if (unlikely(p == NULL)) | |
a419aef8 | 231 | return htonl(NFS4ERR_RESOURCE); |
4aece6a1 BH |
232 | |
233 | memcpy(sid->data, p, len); | |
234 | return 0; | |
235 | } | |
236 | ||
9733f0d9 | 237 | static __be32 decode_rc_list(struct xdr_stream *xdr, |
4aece6a1 BH |
238 | struct referring_call_list *rc_list) |
239 | { | |
9733f0d9 | 240 | __be32 *p; |
4aece6a1 | 241 | int i; |
9733f0d9 | 242 | __be32 status; |
4aece6a1 BH |
243 | |
244 | status = decode_sessionid(xdr, &rc_list->rcl_sessionid); | |
245 | if (status) | |
246 | goto out; | |
247 | ||
248 | status = htonl(NFS4ERR_RESOURCE); | |
249 | p = read_buf(xdr, sizeof(uint32_t)); | |
250 | if (unlikely(p == NULL)) | |
251 | goto out; | |
252 | ||
253 | rc_list->rcl_nrefcalls = ntohl(*p++); | |
254 | if (rc_list->rcl_nrefcalls) { | |
255 | p = read_buf(xdr, | |
256 | rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); | |
257 | if (unlikely(p == NULL)) | |
258 | goto out; | |
259 | rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * | |
260 | sizeof(*rc_list->rcl_refcalls), | |
261 | GFP_KERNEL); | |
262 | if (unlikely(rc_list->rcl_refcalls == NULL)) | |
263 | goto out; | |
264 | for (i = 0; i < rc_list->rcl_nrefcalls; i++) { | |
265 | rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); | |
266 | rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); | |
267 | } | |
268 | } | |
269 | status = 0; | |
270 | ||
271 | out: | |
272 | return status; | |
273 | } | |
274 | ||
9733f0d9 | 275 | static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, |
4aece6a1 BH |
276 | struct xdr_stream *xdr, |
277 | struct cb_sequenceargs *args) | |
278 | { | |
9733f0d9 | 279 | __be32 *p; |
4aece6a1 | 280 | int i; |
9733f0d9 | 281 | __be32 status; |
4aece6a1 BH |
282 | |
283 | status = decode_sessionid(xdr, &args->csa_sessionid); | |
284 | if (status) | |
285 | goto out; | |
286 | ||
287 | status = htonl(NFS4ERR_RESOURCE); | |
288 | p = read_buf(xdr, 5 * sizeof(uint32_t)); | |
289 | if (unlikely(p == NULL)) | |
290 | goto out; | |
291 | ||
65fc64e5 | 292 | args->csa_addr = svc_addr(rqstp); |
4aece6a1 BH |
293 | args->csa_sequenceid = ntohl(*p++); |
294 | args->csa_slotid = ntohl(*p++); | |
295 | args->csa_highestslotid = ntohl(*p++); | |
296 | args->csa_cachethis = ntohl(*p++); | |
297 | args->csa_nrclists = ntohl(*p++); | |
298 | args->csa_rclists = NULL; | |
299 | if (args->csa_nrclists) { | |
300 | args->csa_rclists = kmalloc(args->csa_nrclists * | |
301 | sizeof(*args->csa_rclists), | |
302 | GFP_KERNEL); | |
303 | if (unlikely(args->csa_rclists == NULL)) | |
304 | goto out; | |
305 | ||
306 | for (i = 0; i < args->csa_nrclists; i++) { | |
307 | status = decode_rc_list(xdr, &args->csa_rclists[i]); | |
308 | if (status) | |
309 | goto out_free; | |
310 | } | |
311 | } | |
312 | status = 0; | |
313 | ||
314 | dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " | |
315 | "highestslotid %u cachethis %d nrclists %u\n", | |
316 | __func__, | |
317 | ((u32 *)&args->csa_sessionid)[0], | |
318 | ((u32 *)&args->csa_sessionid)[1], | |
319 | ((u32 *)&args->csa_sessionid)[2], | |
320 | ((u32 *)&args->csa_sessionid)[3], | |
321 | args->csa_sequenceid, args->csa_slotid, | |
322 | args->csa_highestslotid, args->csa_cachethis, | |
323 | args->csa_nrclists); | |
324 | out: | |
325 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
326 | return status; | |
327 | ||
328 | out_free: | |
329 | for (i = 0; i < args->csa_nrclists; i++) | |
330 | kfree(args->csa_rclists[i].rcl_refcalls); | |
331 | kfree(args->csa_rclists); | |
332 | goto out; | |
333 | } | |
334 | ||
9733f0d9 | 335 | static __be32 decode_recallany_args(struct svc_rqst *rqstp, |
31f09607 AB |
336 | struct xdr_stream *xdr, |
337 | struct cb_recallanyargs *args) | |
338 | { | |
9733f0d9 | 339 | __be32 *p; |
31f09607 AB |
340 | |
341 | args->craa_addr = svc_addr(rqstp); | |
342 | p = read_buf(xdr, 4); | |
343 | if (unlikely(p == NULL)) | |
344 | return htonl(NFS4ERR_BADXDR); | |
345 | args->craa_objs_to_keep = ntohl(*p++); | |
346 | p = read_buf(xdr, 4); | |
347 | if (unlikely(p == NULL)) | |
348 | return htonl(NFS4ERR_BADXDR); | |
349 | args->craa_type_mask = ntohl(*p); | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
9733f0d9 | 354 | static __be32 decode_recallslot_args(struct svc_rqst *rqstp, |
b9efa1b2 AA |
355 | struct xdr_stream *xdr, |
356 | struct cb_recallslotargs *args) | |
357 | { | |
358 | __be32 *p; | |
359 | ||
360 | args->crsa_addr = svc_addr(rqstp); | |
361 | p = read_buf(xdr, 4); | |
362 | if (unlikely(p == NULL)) | |
363 | return htonl(NFS4ERR_BADXDR); | |
364 | args->crsa_target_max_slots = ntohl(*p++); | |
365 | return 0; | |
366 | } | |
367 | ||
4aece6a1 BH |
368 | #endif /* CONFIG_NFS_V4_1 */ |
369 | ||
e6f684f6 | 370 | static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) |
1da177e4 | 371 | { |
5704fdeb | 372 | __be32 *p; |
1da177e4 LT |
373 | |
374 | p = xdr_reserve_space(xdr, 4 + len); | |
375 | if (unlikely(p == NULL)) | |
376 | return htonl(NFS4ERR_RESOURCE); | |
377 | xdr_encode_opaque(p, str, len); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) | |
382 | #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) | |
5704fdeb | 383 | static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) |
1da177e4 | 384 | { |
5704fdeb AV |
385 | __be32 bm[2]; |
386 | __be32 *p; | |
1da177e4 LT |
387 | |
388 | bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); | |
389 | bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); | |
390 | if (bm[1] != 0) { | |
391 | p = xdr_reserve_space(xdr, 16); | |
392 | if (unlikely(p == NULL)) | |
393 | return htonl(NFS4ERR_RESOURCE); | |
394 | *p++ = htonl(2); | |
395 | *p++ = bm[0]; | |
396 | *p++ = bm[1]; | |
397 | } else if (bm[0] != 0) { | |
398 | p = xdr_reserve_space(xdr, 12); | |
399 | if (unlikely(p == NULL)) | |
400 | return htonl(NFS4ERR_RESOURCE); | |
401 | *p++ = htonl(1); | |
402 | *p++ = bm[0]; | |
403 | } else { | |
404 | p = xdr_reserve_space(xdr, 8); | |
405 | if (unlikely(p == NULL)) | |
406 | return htonl(NFS4ERR_RESOURCE); | |
407 | *p++ = htonl(0); | |
408 | } | |
409 | *savep = p; | |
410 | return 0; | |
411 | } | |
412 | ||
e6f684f6 | 413 | static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) |
1da177e4 | 414 | { |
5704fdeb | 415 | __be32 *p; |
1da177e4 LT |
416 | |
417 | if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) | |
418 | return 0; | |
419 | p = xdr_reserve_space(xdr, 8); | |
90dc7d27 | 420 | if (unlikely(!p)) |
1da177e4 LT |
421 | return htonl(NFS4ERR_RESOURCE); |
422 | p = xdr_encode_hyper(p, change); | |
423 | return 0; | |
424 | } | |
425 | ||
e6f684f6 | 426 | static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) |
1da177e4 | 427 | { |
5704fdeb | 428 | __be32 *p; |
1da177e4 LT |
429 | |
430 | if (!(bitmap[0] & FATTR4_WORD0_SIZE)) | |
431 | return 0; | |
432 | p = xdr_reserve_space(xdr, 8); | |
90dc7d27 | 433 | if (unlikely(!p)) |
1da177e4 LT |
434 | return htonl(NFS4ERR_RESOURCE); |
435 | p = xdr_encode_hyper(p, size); | |
436 | return 0; | |
437 | } | |
438 | ||
e6f684f6 | 439 | static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) |
1da177e4 | 440 | { |
5704fdeb | 441 | __be32 *p; |
1da177e4 LT |
442 | |
443 | p = xdr_reserve_space(xdr, 12); | |
90dc7d27 | 444 | if (unlikely(!p)) |
1da177e4 LT |
445 | return htonl(NFS4ERR_RESOURCE); |
446 | p = xdr_encode_hyper(p, time->tv_sec); | |
447 | *p = htonl(time->tv_nsec); | |
448 | return 0; | |
449 | } | |
450 | ||
e6f684f6 | 451 | static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) |
1da177e4 LT |
452 | { |
453 | if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) | |
454 | return 0; | |
455 | return encode_attr_time(xdr,time); | |
456 | } | |
457 | ||
e6f684f6 | 458 | static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) |
1da177e4 LT |
459 | { |
460 | if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) | |
461 | return 0; | |
462 | return encode_attr_time(xdr,time); | |
463 | } | |
464 | ||
e6f684f6 | 465 | static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) |
1da177e4 | 466 | { |
e6f684f6 | 467 | __be32 status; |
1da177e4 LT |
468 | |
469 | hdr->status = xdr_reserve_space(xdr, 4); | |
470 | if (unlikely(hdr->status == NULL)) | |
471 | return htonl(NFS4ERR_RESOURCE); | |
472 | status = encode_string(xdr, hdr->taglen, hdr->tag); | |
473 | if (unlikely(status != 0)) | |
474 | return status; | |
475 | hdr->nops = xdr_reserve_space(xdr, 4); | |
476 | if (unlikely(hdr->nops == NULL)) | |
477 | return htonl(NFS4ERR_RESOURCE); | |
478 | return 0; | |
479 | } | |
480 | ||
e6f684f6 | 481 | static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) |
1da177e4 | 482 | { |
5704fdeb | 483 | __be32 *p; |
1da177e4 LT |
484 | |
485 | p = xdr_reserve_space(xdr, 8); | |
486 | if (unlikely(p == NULL)) | |
31d2b435 | 487 | return htonl(NFS4ERR_RESOURCE_HDR); |
1da177e4 LT |
488 | *p++ = htonl(op); |
489 | *p = res; | |
490 | return 0; | |
491 | } | |
492 | ||
e6f684f6 | 493 | static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) |
1da177e4 | 494 | { |
5704fdeb | 495 | __be32 *savep = NULL; |
e6f684f6 | 496 | __be32 status = res->status; |
1da177e4 LT |
497 | |
498 | if (unlikely(status != 0)) | |
499 | goto out; | |
500 | status = encode_attr_bitmap(xdr, res->bitmap, &savep); | |
501 | if (unlikely(status != 0)) | |
502 | goto out; | |
503 | status = encode_attr_change(xdr, res->bitmap, res->change_attr); | |
504 | if (unlikely(status != 0)) | |
505 | goto out; | |
506 | status = encode_attr_size(xdr, res->bitmap, res->size); | |
507 | if (unlikely(status != 0)) | |
508 | goto out; | |
509 | status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); | |
510 | if (unlikely(status != 0)) | |
511 | goto out; | |
512 | status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); | |
513 | *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); | |
514 | out: | |
3110ff80 | 515 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
1da177e4 LT |
516 | return status; |
517 | } | |
518 | ||
34bc47c9 BH |
519 | #if defined(CONFIG_NFS_V4_1) |
520 | ||
9733f0d9 | 521 | static __be32 encode_sessionid(struct xdr_stream *xdr, |
4aece6a1 BH |
522 | const struct nfs4_sessionid *sid) |
523 | { | |
9733f0d9 | 524 | __be32 *p; |
4aece6a1 BH |
525 | int len = NFS4_MAX_SESSIONID_LEN; |
526 | ||
527 | p = xdr_reserve_space(xdr, len); | |
528 | if (unlikely(p == NULL)) | |
529 | return htonl(NFS4ERR_RESOURCE); | |
530 | ||
531 | memcpy(p, sid, len); | |
532 | return 0; | |
533 | } | |
534 | ||
9733f0d9 | 535 | static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, |
4aece6a1 BH |
536 | struct xdr_stream *xdr, |
537 | const struct cb_sequenceres *res) | |
538 | { | |
9733f0d9 | 539 | __be32 *p; |
4aece6a1 BH |
540 | unsigned status = res->csr_status; |
541 | ||
542 | if (unlikely(status != 0)) | |
543 | goto out; | |
544 | ||
545 | encode_sessionid(xdr, &res->csr_sessionid); | |
546 | ||
547 | p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); | |
548 | if (unlikely(p == NULL)) | |
549 | return htonl(NFS4ERR_RESOURCE); | |
550 | ||
551 | *p++ = htonl(res->csr_sequenceid); | |
552 | *p++ = htonl(res->csr_slotid); | |
553 | *p++ = htonl(res->csr_highestslotid); | |
554 | *p++ = htonl(res->csr_target_highestslotid); | |
555 | out: | |
556 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
557 | return status; | |
558 | } | |
559 | ||
34bc47c9 BH |
560 | static __be32 |
561 | preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) | |
562 | { | |
281fe15d BH |
563 | if (op_nr == OP_CB_SEQUENCE) { |
564 | if (nop != 0) | |
565 | return htonl(NFS4ERR_SEQUENCE_POS); | |
566 | } else { | |
567 | if (nop == 0) | |
568 | return htonl(NFS4ERR_OP_NOT_IN_SESSION); | |
569 | } | |
570 | ||
34bc47c9 BH |
571 | switch (op_nr) { |
572 | case OP_CB_GETATTR: | |
573 | case OP_CB_RECALL: | |
4aece6a1 | 574 | case OP_CB_SEQUENCE: |
31f09607 | 575 | case OP_CB_RECALL_ANY: |
b9efa1b2 | 576 | case OP_CB_RECALL_SLOT: |
34bc47c9 BH |
577 | *op = &callback_ops[op_nr]; |
578 | break; | |
579 | ||
580 | case OP_CB_LAYOUTRECALL: | |
581 | case OP_CB_NOTIFY_DEVICEID: | |
582 | case OP_CB_NOTIFY: | |
583 | case OP_CB_PUSH_DELEG: | |
34bc47c9 | 584 | case OP_CB_RECALLABLE_OBJ_AVAIL: |
34bc47c9 BH |
585 | case OP_CB_WANTS_CANCELLED: |
586 | case OP_CB_NOTIFY_LOCK: | |
587 | return htonl(NFS4ERR_NOTSUPP); | |
588 | ||
589 | default: | |
590 | return htonl(NFS4ERR_OP_ILLEGAL); | |
591 | } | |
592 | ||
593 | return htonl(NFS_OK); | |
594 | } | |
595 | ||
596 | #else /* CONFIG_NFS_V4_1 */ | |
597 | ||
598 | static __be32 | |
599 | preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) | |
600 | { | |
601 | return htonl(NFS4ERR_MINOR_VERS_MISMATCH); | |
602 | } | |
603 | ||
604 | #endif /* CONFIG_NFS_V4_1 */ | |
605 | ||
606 | static __be32 | |
607 | preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) | |
608 | { | |
609 | switch (op_nr) { | |
610 | case OP_CB_GETATTR: | |
611 | case OP_CB_RECALL: | |
612 | *op = &callback_ops[op_nr]; | |
613 | break; | |
614 | default: | |
615 | return htonl(NFS4ERR_OP_ILLEGAL); | |
616 | } | |
617 | ||
618 | return htonl(NFS_OK); | |
619 | } | |
620 | ||
621 | static __be32 process_op(uint32_t minorversion, int nop, | |
622 | struct svc_rqst *rqstp, | |
1da177e4 | 623 | struct xdr_stream *xdr_in, void *argp, |
4911096f | 624 | struct xdr_stream *xdr_out, void *resp, int* drc_status) |
1da177e4 | 625 | { |
a162a6b8 | 626 | struct callback_op *op = &callback_ops[0]; |
31d2b435 | 627 | unsigned int op_nr; |
34bc47c9 | 628 | __be32 status; |
1da177e4 | 629 | long maxlen; |
e6f684f6 | 630 | __be32 res; |
1da177e4 | 631 | |
3110ff80 | 632 | dprintk("%s: start\n", __func__); |
1da177e4 | 633 | status = decode_op_hdr(xdr_in, &op_nr); |
31d2b435 AA |
634 | if (unlikely(status)) |
635 | return status; | |
1da177e4 | 636 | |
34bc47c9 BH |
637 | dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", |
638 | __func__, minorversion, nop, op_nr); | |
639 | ||
640 | status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : | |
641 | preprocess_nfs4_op(op_nr, &op); | |
642 | if (status == htonl(NFS4ERR_OP_ILLEGAL)) | |
643 | op_nr = OP_CB_ILLEGAL; | |
b92b3019 AA |
644 | if (status) |
645 | goto encode_hdr; | |
31d2b435 | 646 | |
4911096f AA |
647 | if (*drc_status) { |
648 | status = *drc_status; | |
649 | goto encode_hdr; | |
650 | } | |
651 | ||
1da177e4 LT |
652 | maxlen = xdr_out->end - xdr_out->p; |
653 | if (maxlen > 0 && maxlen < PAGE_SIZE) { | |
e95e60da AA |
654 | status = op->decode_args(rqstp, xdr_in, argp); |
655 | if (likely(status == 0)) | |
1da177e4 LT |
656 | status = op->process_op(argp, resp); |
657 | } else | |
658 | status = htonl(NFS4ERR_RESOURCE); | |
659 | ||
4911096f AA |
660 | /* Only set by OP_CB_SEQUENCE processing */ |
661 | if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { | |
662 | *drc_status = status; | |
663 | status = 0; | |
664 | } | |
665 | ||
b92b3019 | 666 | encode_hdr: |
1da177e4 | 667 | res = encode_op_hdr(xdr_out, op_nr, status); |
31d2b435 AA |
668 | if (unlikely(res)) |
669 | return res; | |
1da177e4 LT |
670 | if (op->encode_res != NULL && status == 0) |
671 | status = op->encode_res(rqstp, xdr_out, resp); | |
3110ff80 | 672 | dprintk("%s: done, status = %d\n", __func__, ntohl(status)); |
1da177e4 LT |
673 | return status; |
674 | } | |
675 | ||
676 | /* | |
677 | * Decode, process and encode a COMPOUND | |
678 | */ | |
7111c66e | 679 | static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) |
1da177e4 | 680 | { |
3a6258e1 TM |
681 | struct cb_compound_hdr_arg hdr_arg = { 0 }; |
682 | struct cb_compound_hdr_res hdr_res = { NULL }; | |
1da177e4 | 683 | struct xdr_stream xdr_in, xdr_out; |
5704fdeb | 684 | __be32 *p; |
4911096f | 685 | __be32 status, drc_status = 0; |
3a6258e1 | 686 | unsigned int nops = 0; |
1da177e4 | 687 | |
3110ff80 | 688 | dprintk("%s: start\n", __func__); |
1da177e4 LT |
689 | |
690 | xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); | |
691 | ||
5704fdeb | 692 | p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); |
1da177e4 LT |
693 | xdr_init_encode(&xdr_out, &rqstp->rq_res, p); |
694 | ||
3a6258e1 TM |
695 | status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); |
696 | if (status == __constant_htonl(NFS4ERR_RESOURCE)) | |
697 | return rpc_garbage_args; | |
698 | ||
1da177e4 LT |
699 | hdr_res.taglen = hdr_arg.taglen; |
700 | hdr_res.tag = hdr_arg.tag; | |
3a6258e1 TM |
701 | if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) |
702 | return rpc_system_err; | |
1da177e4 | 703 | |
3a6258e1 | 704 | while (status == 0 && nops != hdr_arg.nops) { |
4911096f AA |
705 | status = process_op(hdr_arg.minorversion, nops, rqstp, |
706 | &xdr_in, argp, &xdr_out, resp, &drc_status); | |
1da177e4 LT |
707 | nops++; |
708 | } | |
3a6258e1 | 709 | |
31d2b435 AA |
710 | /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return |
711 | * resource error in cb_compound status without returning op */ | |
712 | if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { | |
713 | status = htonl(NFS4ERR_RESOURCE); | |
714 | nops--; | |
715 | } | |
716 | ||
1da177e4 LT |
717 | *hdr_res.status = status; |
718 | *hdr_res.nops = htonl(nops); | |
3110ff80 | 719 | dprintk("%s: done, status = %u\n", __func__, ntohl(status)); |
1da177e4 LT |
720 | return rpc_success; |
721 | } | |
722 | ||
723 | /* | |
724 | * Define NFS4 callback COMPOUND ops. | |
725 | */ | |
726 | static struct callback_op callback_ops[] = { | |
727 | [0] = { | |
728 | .res_maxsize = CB_OP_HDR_RES_MAXSZ, | |
729 | }, | |
730 | [OP_CB_GETATTR] = { | |
731 | .process_op = (callback_process_op_t)nfs4_callback_getattr, | |
732 | .decode_args = (callback_decode_arg_t)decode_getattr_args, | |
733 | .encode_res = (callback_encode_res_t)encode_getattr_res, | |
734 | .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, | |
735 | }, | |
736 | [OP_CB_RECALL] = { | |
737 | .process_op = (callback_process_op_t)nfs4_callback_recall, | |
738 | .decode_args = (callback_decode_arg_t)decode_recall_args, | |
739 | .res_maxsize = CB_OP_RECALL_RES_MAXSZ, | |
4aece6a1 BH |
740 | }, |
741 | #if defined(CONFIG_NFS_V4_1) | |
742 | [OP_CB_SEQUENCE] = { | |
743 | .process_op = (callback_process_op_t)nfs4_callback_sequence, | |
744 | .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, | |
745 | .encode_res = (callback_encode_res_t)encode_cb_sequence_res, | |
746 | .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, | |
747 | }, | |
31f09607 AB |
748 | [OP_CB_RECALL_ANY] = { |
749 | .process_op = (callback_process_op_t)nfs4_callback_recallany, | |
750 | .decode_args = (callback_decode_arg_t)decode_recallany_args, | |
751 | .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, | |
752 | }, | |
b9efa1b2 AA |
753 | [OP_CB_RECALL_SLOT] = { |
754 | .process_op = (callback_process_op_t)nfs4_callback_recallslot, | |
755 | .decode_args = (callback_decode_arg_t)decode_recallslot_args, | |
756 | .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, | |
757 | }, | |
4aece6a1 | 758 | #endif /* CONFIG_NFS_V4_1 */ |
1da177e4 LT |
759 | }; |
760 | ||
761 | /* | |
762 | * Define NFS4 callback procedures | |
763 | */ | |
764 | static struct svc_procedure nfs4_callback_procedures1[] = { | |
765 | [CB_NULL] = { | |
766 | .pc_func = nfs4_callback_null, | |
767 | .pc_decode = (kxdrproc_t)nfs4_decode_void, | |
768 | .pc_encode = (kxdrproc_t)nfs4_encode_void, | |
769 | .pc_xdrressize = 1, | |
770 | }, | |
771 | [CB_COMPOUND] = { | |
772 | .pc_func = nfs4_callback_compound, | |
773 | .pc_encode = (kxdrproc_t)nfs4_encode_void, | |
774 | .pc_argsize = 256, | |
775 | .pc_ressize = 256, | |
776 | .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, | |
777 | } | |
778 | }; | |
779 | ||
780 | struct svc_version nfs4_callback_version1 = { | |
781 | .vs_vers = 1, | |
782 | .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), | |
783 | .vs_proc = nfs4_callback_procedures1, | |
784 | .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, | |
785 | .vs_dispatch = NULL, | |
49697ee7 | 786 | .vs_hidden = 1, |
1da177e4 LT |
787 | }; |
788 | ||
07bccc2d AB |
789 | struct svc_version nfs4_callback_version4 = { |
790 | .vs_vers = 4, | |
791 | .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), | |
792 | .vs_proc = nfs4_callback_procedures1, | |
793 | .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, | |
794 | .vs_dispatch = NULL, | |
795 | }; |