1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
12 #define NFSDDBG_FACILITY NFSDDBG_XDR
15 * Mapping of S_IF* types to NFS file types
17 static u32 nfs_ftypes[] = {
18 NFNON, NFCHR, NFCHR, NFBAD,
19 NFDIR, NFBAD, NFBLK, NFBAD,
20 NFREG, NFBAD, NFLNK, NFBAD,
21 NFSOCK, NFBAD, NFLNK, NFBAD,
26 * Basic NFSv2 data types (RFC 1094 Section 2.3)
30 * svcxdr_decode_fhandle - Decode an NFSv2 file handle
31 * @xdr: XDR stream positioned at an encoded NFSv2 FH
32 * @fhp: OUT: filled-in server file handle
35 * %false: The encoded file handle was not valid
36 * %true: @fhp has been initialized
39 svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp)
43 p = xdr_inline_decode(xdr, NFS_FHSIZE);
46 fh_init(fhp, NFS_FHSIZE);
47 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
48 fhp->fh_handle.fh_size = NFS_FHSIZE;
54 encode_fh(__be32 *p, struct svc_fh *fhp)
56 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
57 return p + (NFS_FHSIZE>> 2);
61 svcxdr_decode_filename(struct xdr_stream *xdr, char **name, unsigned int *len)
67 if (xdr_stream_decode_u32(xdr, &size) < 0)
69 if (size == 0 || size > NFS_MAXNAMLEN)
71 p = xdr_inline_decode(xdr, size);
77 for (i = 0, c = *name; i < size; i++, c++)
78 if (*c == '\0' || *c == '/')
85 svcxdr_decode_diropargs(struct xdr_stream *xdr, struct svc_fh *fhp,
86 char **name, unsigned int *len)
88 return svcxdr_decode_fhandle(xdr, fhp) &&
89 svcxdr_decode_filename(xdr, name, len);
93 svcxdr_decode_sattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
99 p = xdr_inline_decode(xdr, XDR_UNIT * 8);
106 * Some Sun clients put 0xffff in the mode field when they
109 tmp1 = be32_to_cpup(p++);
110 if (tmp1 != (u32)-1 && tmp1 != 0xffff) {
111 iap->ia_valid |= ATTR_MODE;
115 tmp1 = be32_to_cpup(p++);
116 if (tmp1 != (u32)-1) {
117 iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1);
118 if (uid_valid(iap->ia_uid))
119 iap->ia_valid |= ATTR_UID;
122 tmp1 = be32_to_cpup(p++);
123 if (tmp1 != (u32)-1) {
124 iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1);
125 if (gid_valid(iap->ia_gid))
126 iap->ia_valid |= ATTR_GID;
129 tmp1 = be32_to_cpup(p++);
130 if (tmp1 != (u32)-1) {
131 iap->ia_valid |= ATTR_SIZE;
135 tmp1 = be32_to_cpup(p++);
136 tmp2 = be32_to_cpup(p++);
137 if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
138 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
139 iap->ia_atime.tv_sec = tmp1;
140 iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC;
143 tmp1 = be32_to_cpup(p++);
144 tmp2 = be32_to_cpup(p++);
145 if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
146 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
147 iap->ia_mtime.tv_sec = tmp1;
148 iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC;
150 * Passing the invalid value useconds=1000000 for mtime
151 * is a Sun convention for "set both mtime and atime to
152 * current server time". It's needed to make permissions
153 * checks for the "touch" program across v2 mounts to
154 * Solaris and Irix boxes work correctly. See description of
155 * sattr in section 6.1 of "NFS Illustrated" by
156 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
159 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
166 encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
169 struct user_namespace *userns = nfsd_user_namespace(rqstp);
170 struct dentry *dentry = fhp->fh_dentry;
172 struct timespec64 time;
175 type = (stat->mode & S_IFMT);
177 *p++ = htonl(nfs_ftypes[type >> 12]);
178 *p++ = htonl((u32) stat->mode);
179 *p++ = htonl((u32) stat->nlink);
180 *p++ = htonl((u32) from_kuid_munged(userns, stat->uid));
181 *p++ = htonl((u32) from_kgid_munged(userns, stat->gid));
183 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
184 *p++ = htonl(NFS_MAXPATHLEN);
186 *p++ = htonl((u32) stat->size);
188 *p++ = htonl((u32) stat->blksize);
189 if (S_ISCHR(type) || S_ISBLK(type))
190 *p++ = htonl(new_encode_dev(stat->rdev));
192 *p++ = htonl(0xffffffff);
193 *p++ = htonl((u32) stat->blocks);
194 switch (fsid_source(fhp)) {
197 *p++ = htonl(new_encode_dev(stat->dev));
199 case FSIDSOURCE_FSID:
200 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
202 case FSIDSOURCE_UUID:
203 f = ((u32*)fhp->fh_export->ex_uuid)[0];
204 f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
205 f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
206 f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
210 *p++ = htonl((u32) stat->ino);
211 *p++ = htonl((u32) stat->atime.tv_sec);
212 *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
214 lease_get_mtime(d_inode(dentry), &time);
215 *p++ = htonl((u32) time.tv_sec);
216 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
217 *p++ = htonl((u32) stat->ctime.tv_sec);
218 *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
223 /* Helper function for NFSv2 ACL code */
224 __be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat)
226 return encode_fattr(rqstp, p, fhp, stat);
230 * XDR decode functions
234 nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
236 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
237 struct nfsd_fhandle *args = rqstp->rq_argp;
239 return svcxdr_decode_fhandle(xdr, &args->fh);
243 nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
245 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
246 struct nfsd_sattrargs *args = rqstp->rq_argp;
248 return svcxdr_decode_fhandle(xdr, &args->fh) &&
249 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
253 nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
255 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
256 struct nfsd_diropargs *args = rqstp->rq_argp;
258 return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
262 nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
264 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
265 struct nfsd_readargs *args = rqstp->rq_argp;
268 if (!svcxdr_decode_fhandle(xdr, &args->fh))
270 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
272 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
274 /* totalcount is ignored */
275 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
282 nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
284 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
285 struct nfsd_writeargs *args = rqstp->rq_argp;
286 struct kvec *head = rqstp->rq_arg.head;
287 struct kvec *tail = rqstp->rq_arg.tail;
288 u32 beginoffset, totalcount;
291 if (!svcxdr_decode_fhandle(xdr, &args->fh))
293 /* beginoffset is ignored */
294 if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
296 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
298 /* totalcount is ignored */
299 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
303 if (xdr_stream_decode_u32(xdr, &args->len) < 0)
305 if (args->len > NFSSVC_MAXBLKSIZE_V2)
307 remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
308 remaining -= xdr_stream_pos(xdr);
309 if (remaining < xdr_align_size(args->len))
311 args->first.iov_base = xdr->p;
312 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
318 nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
320 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
321 struct nfsd_createargs *args = rqstp->rq_argp;
323 return svcxdr_decode_diropargs(xdr, &args->fh,
324 &args->name, &args->len) &&
325 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
329 nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
331 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
332 struct nfsd_renameargs *args = rqstp->rq_argp;
334 return svcxdr_decode_diropargs(xdr, &args->ffh,
335 &args->fname, &args->flen) &&
336 svcxdr_decode_diropargs(xdr, &args->tfh,
337 &args->tname, &args->tlen);
341 nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
343 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
344 struct nfsd_linkargs *args = rqstp->rq_argp;
346 return svcxdr_decode_fhandle(xdr, &args->ffh) &&
347 svcxdr_decode_diropargs(xdr, &args->tfh,
348 &args->tname, &args->tlen);
352 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
354 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
355 struct nfsd_symlinkargs *args = rqstp->rq_argp;
356 struct kvec *head = rqstp->rq_arg.head;
358 if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
360 if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
365 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
366 args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
367 if (!args->first.iov_base)
369 return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
373 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
375 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
376 struct nfsd_readdirargs *args = rqstp->rq_argp;
378 if (!svcxdr_decode_fhandle(xdr, &args->fh))
380 if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
382 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
389 * XDR encode functions
393 nfssvc_encode_stat(struct svc_rqst *rqstp, __be32 *p)
395 struct nfsd_stat *resp = rqstp->rq_resp;
398 return xdr_ressize_check(rqstp, p);
402 nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
404 struct nfsd_attrstat *resp = rqstp->rq_resp;
407 if (resp->status != nfs_ok)
409 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
411 return xdr_ressize_check(rqstp, p);
415 nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
417 struct nfsd_diropres *resp = rqstp->rq_resp;
420 if (resp->status != nfs_ok)
422 p = encode_fh(p, &resp->fh);
423 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
425 return xdr_ressize_check(rqstp, p);
429 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
431 struct nfsd_readlinkres *resp = rqstp->rq_resp;
432 struct kvec *head = rqstp->rq_res.head;
435 if (resp->status != nfs_ok)
436 return xdr_ressize_check(rqstp, p);
438 *p++ = htonl(resp->len);
439 xdr_ressize_check(rqstp, p);
440 rqstp->rq_res.page_len = resp->len;
442 /* need to pad the tail */
443 rqstp->rq_res.tail[0].iov_base = p;
445 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
447 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len))
453 nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
455 struct nfsd_readres *resp = rqstp->rq_resp;
456 struct kvec *head = rqstp->rq_res.head;
459 if (resp->status != nfs_ok)
460 return xdr_ressize_check(rqstp, p);
462 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
463 *p++ = htonl(resp->count);
464 xdr_ressize_check(rqstp, p);
466 /* now update rqstp->rq_res to reflect data as well */
467 rqstp->rq_res.page_len = resp->count;
468 if (resp->count & 3) {
469 /* need to pad the tail */
470 rqstp->rq_res.tail[0].iov_base = p;
472 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
474 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count))
480 nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
482 struct nfsd_readdirres *resp = rqstp->rq_resp;
485 if (resp->status != nfs_ok)
486 return xdr_ressize_check(rqstp, p);
488 xdr_ressize_check(rqstp, p);
490 *p++ = 0; /* no more entries */
491 *p++ = htonl((resp->common.err == nfserr_eof));
492 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
498 nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p)
500 struct nfsd_statfsres *resp = rqstp->rq_resp;
501 struct kstatfs *stat = &resp->stats;
504 if (resp->status != nfs_ok)
505 return xdr_ressize_check(rqstp, p);
507 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
508 *p++ = htonl(stat->f_bsize);
509 *p++ = htonl(stat->f_blocks);
510 *p++ = htonl(stat->f_bfree);
511 *p++ = htonl(stat->f_bavail);
512 return xdr_ressize_check(rqstp, p);
516 nfssvc_encode_entry(void *ccdv, const char *name,
517 int namlen, loff_t offset, u64 ino, unsigned int d_type)
519 struct readdir_cd *ccd = ccdv;
520 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
521 __be32 *p = cd->buffer;
525 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
526 namlen, name, offset, ino);
529 if (offset > ~((u32) 0)) {
530 cd->common.err = nfserr_fbig;
534 *cd->offset = htonl(offset);
536 /* truncate filename */
537 namlen = min(namlen, NFS2_MAXNAMLEN);
538 slen = XDR_QUADLEN(namlen);
540 if ((buflen = cd->buflen - slen - 4) < 0) {
541 cd->common.err = nfserr_toosmall;
544 if (ino > ~((u32) 0)) {
545 cd->common.err = nfserr_fbig;
548 *p++ = xdr_one; /* mark entry present */
549 *p++ = htonl((u32) ino); /* file id */
550 p = xdr_encode_array(p, name, namlen);/* name length & name */
551 cd->offset = p; /* remember pointer */
552 *p++ = htonl(~0U); /* offset of next entry */
556 cd->common.err = nfs_ok;
561 * XDR release functions
563 void nfssvc_release_attrstat(struct svc_rqst *rqstp)
565 struct nfsd_attrstat *resp = rqstp->rq_resp;
570 void nfssvc_release_diropres(struct svc_rqst *rqstp)
572 struct nfsd_diropres *resp = rqstp->rq_resp;
577 void nfssvc_release_readres(struct svc_rqst *rqstp)
579 struct nfsd_readres *resp = rqstp->rq_resp;