1 /* 2 * linux/fs/nfsd/nfsxdr.c 3 * 4 * XDR support for nfsd 5 * 6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 7 */ 8 9 #include <linux/types.h> 10 #include <linux/time.h> 11 #include <linux/nfs.h> 12 #include <linux/vfs.h> 13 #include <linux/sunrpc/xdr.h> 14 #include <linux/sunrpc/svc.h> 15 #include <linux/nfsd/nfsd.h> 16 #include <linux/nfsd/xdr.h> 17 #include <linux/mm.h> 18 19 #define NFSDDBG_FACILITY NFSDDBG_XDR 20 21 /* 22 * Mapping of S_IF* types to NFS file types 23 */ 24 static u32 nfs_ftypes[] = { 25 NFNON, NFCHR, NFCHR, NFBAD, 26 NFDIR, NFBAD, NFBLK, NFBAD, 27 NFREG, NFBAD, NFLNK, NFBAD, 28 NFSOCK, NFBAD, NFLNK, NFBAD, 29 }; 30 31 32 /* 33 * XDR functions for basic NFS types 34 */ 35 static __be32 * 36 decode_fh(__be32 *p, struct svc_fh *fhp) 37 { 38 fh_init(fhp, NFS_FHSIZE); 39 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE); 40 fhp->fh_handle.fh_size = NFS_FHSIZE; 41 42 /* FIXME: Look up export pointer here and verify 43 * Sun Secure RPC if requested */ 44 return p + (NFS_FHSIZE >> 2); 45 } 46 47 /* Helper function for NFSv2 ACL code */ 48 __be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp) 49 { 50 return decode_fh(p, fhp); 51 } 52 53 static __be32 * 54 encode_fh(__be32 *p, struct svc_fh *fhp) 55 { 56 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE); 57 return p + (NFS_FHSIZE>> 2); 58 } 59 60 /* 61 * Decode a file name and make sure that the path contains 62 * no slashes or null bytes. 63 */ 64 static __be32 * 65 decode_filename(__be32 *p, char **namp, int *lenp) 66 { 67 char *name; 68 int i; 69 70 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) { 71 for (i = 0, name = *namp; i < *lenp; i++, name++) { 72 if (*name == '\0' || *name == '/') 73 return NULL; 74 } 75 } 76 77 return p; 78 } 79 80 static __be32 * 81 decode_pathname(__be32 *p, char **namp, int *lenp) 82 { 83 char *name; 84 int i; 85 86 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) { 87 for (i = 0, name = *namp; i < *lenp; i++, name++) { 88 if (*name == '\0') 89 return NULL; 90 } 91 } 92 93 return p; 94 } 95 96 static __be32 * 97 decode_sattr(__be32 *p, struct iattr *iap) 98 { 99 u32 tmp, tmp1; 100 101 iap->ia_valid = 0; 102 103 /* Sun client bug compatibility check: some sun clients seem to 104 * put 0xffff in the mode field when they mean 0xffffffff. 105 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah. 106 */ 107 if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) { 108 iap->ia_valid |= ATTR_MODE; 109 iap->ia_mode = tmp; 110 } 111 if ((tmp = ntohl(*p++)) != (u32)-1) { 112 iap->ia_valid |= ATTR_UID; 113 iap->ia_uid = tmp; 114 } 115 if ((tmp = ntohl(*p++)) != (u32)-1) { 116 iap->ia_valid |= ATTR_GID; 117 iap->ia_gid = tmp; 118 } 119 if ((tmp = ntohl(*p++)) != (u32)-1) { 120 iap->ia_valid |= ATTR_SIZE; 121 iap->ia_size = tmp; 122 } 123 tmp = ntohl(*p++); tmp1 = ntohl(*p++); 124 if (tmp != (u32)-1 && tmp1 != (u32)-1) { 125 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; 126 iap->ia_atime.tv_sec = tmp; 127 iap->ia_atime.tv_nsec = tmp1 * 1000; 128 } 129 tmp = ntohl(*p++); tmp1 = ntohl(*p++); 130 if (tmp != (u32)-1 && tmp1 != (u32)-1) { 131 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; 132 iap->ia_mtime.tv_sec = tmp; 133 iap->ia_mtime.tv_nsec = tmp1 * 1000; 134 /* 135 * Passing the invalid value useconds=1000000 for mtime 136 * is a Sun convention for "set both mtime and atime to 137 * current server time". It's needed to make permissions 138 * checks for the "touch" program across v2 mounts to 139 * Solaris and Irix boxes work correctly. See description of 140 * sattr in section 6.1 of "NFS Illustrated" by 141 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5 142 */ 143 if (tmp1 == 1000000) 144 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET); 145 } 146 return p; 147 } 148 149 static __be32 * 150 encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, 151 struct kstat *stat) 152 { 153 struct dentry *dentry = fhp->fh_dentry; 154 int type; 155 struct timespec time; 156 u32 f; 157 158 type = (stat->mode & S_IFMT); 159 160 *p++ = htonl(nfs_ftypes[type >> 12]); 161 *p++ = htonl((u32) stat->mode); 162 *p++ = htonl((u32) stat->nlink); 163 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid)); 164 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid)); 165 166 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) { 167 *p++ = htonl(NFS_MAXPATHLEN); 168 } else { 169 *p++ = htonl((u32) stat->size); 170 } 171 *p++ = htonl((u32) stat->blksize); 172 if (S_ISCHR(type) || S_ISBLK(type)) 173 *p++ = htonl(new_encode_dev(stat->rdev)); 174 else 175 *p++ = htonl(0xffffffff); 176 *p++ = htonl((u32) stat->blocks); 177 switch (fsid_source(fhp)) { 178 default: 179 case FSIDSOURCE_DEV: 180 *p++ = htonl(new_encode_dev(stat->dev)); 181 break; 182 case FSIDSOURCE_FSID: 183 *p++ = htonl((u32) fhp->fh_export->ex_fsid); 184 break; 185 case FSIDSOURCE_UUID: 186 f = ((u32*)fhp->fh_export->ex_uuid)[0]; 187 f ^= ((u32*)fhp->fh_export->ex_uuid)[1]; 188 f ^= ((u32*)fhp->fh_export->ex_uuid)[2]; 189 f ^= ((u32*)fhp->fh_export->ex_uuid)[3]; 190 *p++ = htonl(f); 191 break; 192 } 193 *p++ = htonl((u32) stat->ino); 194 *p++ = htonl((u32) stat->atime.tv_sec); 195 *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0); 196 lease_get_mtime(dentry->d_inode, &time); 197 *p++ = htonl((u32) time.tv_sec); 198 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); 199 *p++ = htonl((u32) stat->ctime.tv_sec); 200 *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0); 201 202 return p; 203 } 204 205 /* Helper function for NFSv2 ACL code */ 206 __be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) 207 { 208 struct kstat stat; 209 vfs_getattr(fhp->fh_export->ex_mnt, fhp->fh_dentry, &stat); 210 return encode_fattr(rqstp, p, fhp, &stat); 211 } 212 213 /* 214 * XDR decode functions 215 */ 216 int 217 nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 218 { 219 return xdr_argsize_check(rqstp, p); 220 } 221 222 int 223 nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args) 224 { 225 if (!(p = decode_fh(p, &args->fh))) 226 return 0; 227 return xdr_argsize_check(rqstp, p); 228 } 229 230 int 231 nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p, 232 struct nfsd_sattrargs *args) 233 { 234 p = decode_fh(p, &args->fh); 235 if (!p) 236 return 0; 237 p = decode_sattr(p, &args->attrs); 238 239 return xdr_argsize_check(rqstp, p); 240 } 241 242 int 243 nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p, 244 struct nfsd_diropargs *args) 245 { 246 if (!(p = decode_fh(p, &args->fh)) 247 || !(p = decode_filename(p, &args->name, &args->len))) 248 return 0; 249 250 return xdr_argsize_check(rqstp, p); 251 } 252 253 int 254 nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p, 255 struct nfsd_readargs *args) 256 { 257 unsigned int len; 258 int v,pn; 259 if (!(p = decode_fh(p, &args->fh))) 260 return 0; 261 262 args->offset = ntohl(*p++); 263 len = args->count = ntohl(*p++); 264 p++; /* totalcount - unused */ 265 266 if (len > NFSSVC_MAXBLKSIZE_V2) 267 len = NFSSVC_MAXBLKSIZE_V2; 268 269 /* set up somewhere to store response. 270 * We take pages, put them on reslist and include in iovec 271 */ 272 v=0; 273 while (len > 0) { 274 pn = rqstp->rq_resused++; 275 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]); 276 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE; 277 len -= rqstp->rq_vec[v].iov_len; 278 v++; 279 } 280 args->vlen = v; 281 return xdr_argsize_check(rqstp, p); 282 } 283 284 int 285 nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p, 286 struct nfsd_writeargs *args) 287 { 288 unsigned int len, hdr, dlen; 289 int v; 290 291 if (!(p = decode_fh(p, &args->fh))) 292 return 0; 293 294 p++; /* beginoffset */ 295 args->offset = ntohl(*p++); /* offset */ 296 p++; /* totalcount */ 297 len = args->len = ntohl(*p++); 298 /* 299 * The protocol specifies a maximum of 8192 bytes. 300 */ 301 if (len > NFSSVC_MAXBLKSIZE_V2) 302 return 0; 303 304 /* 305 * Check to make sure that we got the right number of 306 * bytes. 307 */ 308 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; 309 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len 310 - hdr; 311 312 /* 313 * Round the length of the data which was specified up to 314 * the next multiple of XDR units and then compare that 315 * against the length which was actually received. 316 */ 317 if (dlen != XDR_QUADLEN(len)*4) 318 return 0; 319 320 rqstp->rq_vec[0].iov_base = (void*)p; 321 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; 322 v = 0; 323 while (len > rqstp->rq_vec[v].iov_len) { 324 len -= rqstp->rq_vec[v].iov_len; 325 v++; 326 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]); 327 rqstp->rq_vec[v].iov_len = PAGE_SIZE; 328 } 329 rqstp->rq_vec[v].iov_len = len; 330 args->vlen = v + 1; 331 return 1; 332 } 333 334 int 335 nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p, 336 struct nfsd_createargs *args) 337 { 338 if ( !(p = decode_fh(p, &args->fh)) 339 || !(p = decode_filename(p, &args->name, &args->len))) 340 return 0; 341 p = decode_sattr(p, &args->attrs); 342 343 return xdr_argsize_check(rqstp, p); 344 } 345 346 int 347 nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p, 348 struct nfsd_renameargs *args) 349 { 350 if (!(p = decode_fh(p, &args->ffh)) 351 || !(p = decode_filename(p, &args->fname, &args->flen)) 352 || !(p = decode_fh(p, &args->tfh)) 353 || !(p = decode_filename(p, &args->tname, &args->tlen))) 354 return 0; 355 356 return xdr_argsize_check(rqstp, p); 357 } 358 359 int 360 nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args) 361 { 362 if (!(p = decode_fh(p, &args->fh))) 363 return 0; 364 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]); 365 366 return xdr_argsize_check(rqstp, p); 367 } 368 369 int 370 nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p, 371 struct nfsd_linkargs *args) 372 { 373 if (!(p = decode_fh(p, &args->ffh)) 374 || !(p = decode_fh(p, &args->tfh)) 375 || !(p = decode_filename(p, &args->tname, &args->tlen))) 376 return 0; 377 378 return xdr_argsize_check(rqstp, p); 379 } 380 381 int 382 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p, 383 struct nfsd_symlinkargs *args) 384 { 385 if ( !(p = decode_fh(p, &args->ffh)) 386 || !(p = decode_filename(p, &args->fname, &args->flen)) 387 || !(p = decode_pathname(p, &args->tname, &args->tlen))) 388 return 0; 389 p = decode_sattr(p, &args->attrs); 390 391 return xdr_argsize_check(rqstp, p); 392 } 393 394 int 395 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p, 396 struct nfsd_readdirargs *args) 397 { 398 if (!(p = decode_fh(p, &args->fh))) 399 return 0; 400 args->cookie = ntohl(*p++); 401 args->count = ntohl(*p++); 402 if (args->count > PAGE_SIZE) 403 args->count = PAGE_SIZE; 404 405 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]); 406 407 return xdr_argsize_check(rqstp, p); 408 } 409 410 /* 411 * XDR encode functions 412 */ 413 int 414 nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 415 { 416 return xdr_ressize_check(rqstp, p); 417 } 418 419 int 420 nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p, 421 struct nfsd_attrstat *resp) 422 { 423 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); 424 return xdr_ressize_check(rqstp, p); 425 } 426 427 int 428 nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p, 429 struct nfsd_diropres *resp) 430 { 431 p = encode_fh(p, &resp->fh); 432 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); 433 return xdr_ressize_check(rqstp, p); 434 } 435 436 int 437 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p, 438 struct nfsd_readlinkres *resp) 439 { 440 *p++ = htonl(resp->len); 441 xdr_ressize_check(rqstp, p); 442 rqstp->rq_res.page_len = resp->len; 443 if (resp->len & 3) { 444 /* need to pad the tail */ 445 rqstp->rq_res.tail[0].iov_base = p; 446 *p = 0; 447 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); 448 } 449 return 1; 450 } 451 452 int 453 nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p, 454 struct nfsd_readres *resp) 455 { 456 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); 457 *p++ = htonl(resp->count); 458 xdr_ressize_check(rqstp, p); 459 460 /* now update rqstp->rq_res to reflect data aswell */ 461 rqstp->rq_res.page_len = resp->count; 462 if (resp->count & 3) { 463 /* need to pad the tail */ 464 rqstp->rq_res.tail[0].iov_base = p; 465 *p = 0; 466 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3); 467 } 468 return 1; 469 } 470 471 int 472 nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p, 473 struct nfsd_readdirres *resp) 474 { 475 xdr_ressize_check(rqstp, p); 476 p = resp->buffer; 477 *p++ = 0; /* no more entries */ 478 *p++ = htonl((resp->common.err == nfserr_eof)); 479 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1; 480 481 return 1; 482 } 483 484 int 485 nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p, 486 struct nfsd_statfsres *resp) 487 { 488 struct kstatfs *stat = &resp->stats; 489 490 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */ 491 *p++ = htonl(stat->f_bsize); 492 *p++ = htonl(stat->f_blocks); 493 *p++ = htonl(stat->f_bfree); 494 *p++ = htonl(stat->f_bavail); 495 return xdr_ressize_check(rqstp, p); 496 } 497 498 int 499 nfssvc_encode_entry(void *ccdv, const char *name, 500 int namlen, loff_t offset, u64 ino, unsigned int d_type) 501 { 502 struct readdir_cd *ccd = ccdv; 503 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common); 504 __be32 *p = cd->buffer; 505 int buflen, slen; 506 507 /* 508 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n", 509 namlen, name, offset, ino); 510 */ 511 512 if (offset > ~((u32) 0)) { 513 cd->common.err = nfserr_fbig; 514 return -EINVAL; 515 } 516 if (cd->offset) 517 *cd->offset = htonl(offset); 518 if (namlen > NFS2_MAXNAMLEN) 519 namlen = NFS2_MAXNAMLEN;/* truncate filename */ 520 521 slen = XDR_QUADLEN(namlen); 522 if ((buflen = cd->buflen - slen - 4) < 0) { 523 cd->common.err = nfserr_toosmall; 524 return -EINVAL; 525 } 526 *p++ = xdr_one; /* mark entry present */ 527 *p++ = htonl((u32) ino); /* file id */ 528 p = xdr_encode_array(p, name, namlen);/* name length & name */ 529 cd->offset = p; /* remember pointer */ 530 *p++ = htonl(~0U); /* offset of next entry */ 531 532 cd->buflen = buflen; 533 cd->buffer = p; 534 cd->common.err = nfs_ok; 535 return 0; 536 } 537 538 /* 539 * XDR release functions 540 */ 541 int 542 nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p, 543 struct nfsd_fhandle *resp) 544 { 545 fh_put(&resp->fh); 546 return 1; 547 } 548