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 * XDR functions for basic NFS types
29 decode_fh(__be32 *p, struct svc_fh *fhp)
31 fh_init(fhp, NFS_FHSIZE);
32 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
33 fhp->fh_handle.fh_size = NFS_FHSIZE;
35 /* FIXME: Look up export pointer here and verify
36 * Sun Secure RPC if requested */
37 return p + (NFS_FHSIZE >> 2);
40 /* Helper function for NFSv2 ACL code */
41 __be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
43 return decode_fh(p, fhp);
47 encode_fh(__be32 *p, struct svc_fh *fhp)
49 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
50 return p + (NFS_FHSIZE>> 2);
54 * Decode a file name and make sure that the path contains
55 * no slashes or null bytes.
58 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
63 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
64 for (i = 0, name = *namp; i < *lenp; i++, name++) {
65 if (*name == '\0' || *name == '/')
74 decode_pathname(__be32 *p, char **namp, unsigned int *lenp)
79 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
80 for (i = 0, name = *namp; i < *lenp; i++, name++) {
90 decode_sattr(__be32 *p, struct iattr *iap)
96 /* Sun client bug compatibility check: some sun clients seem to
97 * put 0xffff in the mode field when they mean 0xffffffff.
98 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
100 if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
101 iap->ia_valid |= ATTR_MODE;
104 if ((tmp = ntohl(*p++)) != (u32)-1) {
105 iap->ia_uid = make_kuid(&init_user_ns, tmp);
106 if (uid_valid(iap->ia_uid))
107 iap->ia_valid |= ATTR_UID;
109 if ((tmp = ntohl(*p++)) != (u32)-1) {
110 iap->ia_gid = make_kgid(&init_user_ns, tmp);
111 if (gid_valid(iap->ia_gid))
112 iap->ia_valid |= ATTR_GID;
114 if ((tmp = ntohl(*p++)) != (u32)-1) {
115 iap->ia_valid |= ATTR_SIZE;
118 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
119 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
120 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
121 iap->ia_atime.tv_sec = tmp;
122 iap->ia_atime.tv_nsec = tmp1 * 1000;
124 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
125 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
126 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
127 iap->ia_mtime.tv_sec = tmp;
128 iap->ia_mtime.tv_nsec = tmp1 * 1000;
130 * Passing the invalid value useconds=1000000 for mtime
131 * is a Sun convention for "set both mtime and atime to
132 * current server time". It's needed to make permissions
133 * checks for the "touch" program across v2 mounts to
134 * Solaris and Irix boxes work correctly. See description of
135 * sattr in section 6.1 of "NFS Illustrated" by
136 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
139 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
145 encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
148 struct dentry *dentry = fhp->fh_dentry;
150 struct timespec time;
153 type = (stat->mode & S_IFMT);
155 *p++ = htonl(nfs_ftypes[type >> 12]);
156 *p++ = htonl((u32) stat->mode);
157 *p++ = htonl((u32) stat->nlink);
158 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
159 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
161 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
162 *p++ = htonl(NFS_MAXPATHLEN);
164 *p++ = htonl((u32) stat->size);
166 *p++ = htonl((u32) stat->blksize);
167 if (S_ISCHR(type) || S_ISBLK(type))
168 *p++ = htonl(new_encode_dev(stat->rdev));
170 *p++ = htonl(0xffffffff);
171 *p++ = htonl((u32) stat->blocks);
172 switch (fsid_source(fhp)) {
175 *p++ = htonl(new_encode_dev(stat->dev));
177 case FSIDSOURCE_FSID:
178 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
180 case FSIDSOURCE_UUID:
181 f = ((u32*)fhp->fh_export->ex_uuid)[0];
182 f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
183 f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
184 f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
188 *p++ = htonl((u32) stat->ino);
189 *p++ = htonl((u32) stat->atime.tv_sec);
190 *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
191 lease_get_mtime(d_inode(dentry), &time);
192 *p++ = htonl((u32) time.tv_sec);
193 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
194 *p++ = htonl((u32) stat->ctime.tv_sec);
195 *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
200 /* Helper function for NFSv2 ACL code */
201 __be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat)
203 return encode_fattr(rqstp, p, fhp, stat);
207 * XDR decode functions
210 nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p)
212 return xdr_argsize_check(rqstp, p);
216 nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
218 struct nfsd_fhandle *args = rqstp->rq_argp;
220 p = decode_fh(p, &args->fh);
223 return xdr_argsize_check(rqstp, p);
227 nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
229 struct nfsd_sattrargs *args = rqstp->rq_argp;
231 p = decode_fh(p, &args->fh);
234 p = decode_sattr(p, &args->attrs);
236 return xdr_argsize_check(rqstp, p);
240 nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
242 struct nfsd_diropargs *args = rqstp->rq_argp;
244 if (!(p = decode_fh(p, &args->fh))
245 || !(p = decode_filename(p, &args->name, &args->len)))
248 return xdr_argsize_check(rqstp, p);
252 nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
254 struct nfsd_readargs *args = rqstp->rq_argp;
257 p = decode_fh(p, &args->fh);
261 args->offset = ntohl(*p++);
262 len = args->count = ntohl(*p++);
263 p++; /* totalcount - unused */
265 len = min_t(unsigned int, len, NFSSVC_MAXBLKSIZE_V2);
267 /* set up somewhere to store response.
268 * We take pages, put them on reslist and include in iovec
272 struct page *p = *(rqstp->rq_next_page++);
274 rqstp->rq_vec[v].iov_base = page_address(p);
275 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
276 len -= rqstp->rq_vec[v].iov_len;
280 return xdr_argsize_check(rqstp, p);
284 nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
286 struct nfsd_writeargs *args = rqstp->rq_argp;
287 unsigned int len, hdr, dlen;
288 struct kvec *head = rqstp->rq_arg.head;
291 p = decode_fh(p, &args->fh);
295 p++; /* beginoffset */
296 args->offset = ntohl(*p++); /* offset */
297 p++; /* totalcount */
298 len = args->len = ntohl(*p++);
300 * The protocol specifies a maximum of 8192 bytes.
302 if (len > NFSSVC_MAXBLKSIZE_V2)
306 * Check to make sure that we got the right number of
309 hdr = (void*)p - head->iov_base;
310 if (hdr > head->iov_len)
312 dlen = head->iov_len + rqstp->rq_arg.page_len - hdr;
315 * Round the length of the data which was specified up to
316 * the next multiple of XDR units and then compare that
317 * against the length which was actually received.
318 * Note that when RPCSEC/GSS (for example) is used, the
319 * data buffer can be padded so dlen might be larger
320 * than required. It must never be smaller.
322 if (dlen < XDR_QUADLEN(len)*4)
325 rqstp->rq_vec[0].iov_base = (void*)p;
326 rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
328 while (len > rqstp->rq_vec[v].iov_len) {
329 len -= rqstp->rq_vec[v].iov_len;
331 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
332 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
334 rqstp->rq_vec[v].iov_len = len;
340 nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
342 struct nfsd_createargs *args = rqstp->rq_argp;
344 if ( !(p = decode_fh(p, &args->fh))
345 || !(p = decode_filename(p, &args->name, &args->len)))
347 p = decode_sattr(p, &args->attrs);
349 return xdr_argsize_check(rqstp, p);
353 nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
355 struct nfsd_renameargs *args = rqstp->rq_argp;
357 if (!(p = decode_fh(p, &args->ffh))
358 || !(p = decode_filename(p, &args->fname, &args->flen))
359 || !(p = decode_fh(p, &args->tfh))
360 || !(p = decode_filename(p, &args->tname, &args->tlen)))
363 return xdr_argsize_check(rqstp, p);
367 nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
369 struct nfsd_readlinkargs *args = rqstp->rq_argp;
371 p = decode_fh(p, &args->fh);
374 args->buffer = page_address(*(rqstp->rq_next_page++));
376 return xdr_argsize_check(rqstp, p);
380 nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
382 struct nfsd_linkargs *args = rqstp->rq_argp;
384 if (!(p = decode_fh(p, &args->ffh))
385 || !(p = decode_fh(p, &args->tfh))
386 || !(p = decode_filename(p, &args->tname, &args->tlen)))
389 return xdr_argsize_check(rqstp, p);
393 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
395 struct nfsd_symlinkargs *args = rqstp->rq_argp;
397 if ( !(p = decode_fh(p, &args->ffh))
398 || !(p = decode_filename(p, &args->fname, &args->flen))
399 || !(p = decode_pathname(p, &args->tname, &args->tlen)))
401 p = decode_sattr(p, &args->attrs);
403 return xdr_argsize_check(rqstp, p);
407 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
409 struct nfsd_readdirargs *args = rqstp->rq_argp;
411 p = decode_fh(p, &args->fh);
414 args->cookie = ntohl(*p++);
415 args->count = ntohl(*p++);
416 args->count = min_t(u32, args->count, PAGE_SIZE);
417 args->buffer = page_address(*(rqstp->rq_next_page++));
419 return xdr_argsize_check(rqstp, p);
423 * XDR encode functions
426 nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p)
428 return xdr_ressize_check(rqstp, p);
432 nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
434 struct nfsd_attrstat *resp = rqstp->rq_resp;
436 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
437 return xdr_ressize_check(rqstp, p);
441 nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
443 struct nfsd_diropres *resp = rqstp->rq_resp;
445 p = encode_fh(p, &resp->fh);
446 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
447 return xdr_ressize_check(rqstp, p);
451 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
453 struct nfsd_readlinkres *resp = rqstp->rq_resp;
455 *p++ = htonl(resp->len);
456 xdr_ressize_check(rqstp, p);
457 rqstp->rq_res.page_len = resp->len;
459 /* need to pad the tail */
460 rqstp->rq_res.tail[0].iov_base = p;
462 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
468 nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
470 struct nfsd_readres *resp = rqstp->rq_resp;
472 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
473 *p++ = htonl(resp->count);
474 xdr_ressize_check(rqstp, p);
476 /* now update rqstp->rq_res to reflect data as well */
477 rqstp->rq_res.page_len = resp->count;
478 if (resp->count & 3) {
479 /* need to pad the tail */
480 rqstp->rq_res.tail[0].iov_base = p;
482 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
488 nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
490 struct nfsd_readdirres *resp = rqstp->rq_resp;
492 xdr_ressize_check(rqstp, p);
494 *p++ = 0; /* no more entries */
495 *p++ = htonl((resp->common.err == nfserr_eof));
496 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
502 nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p)
504 struct nfsd_statfsres *resp = rqstp->rq_resp;
505 struct kstatfs *stat = &resp->stats;
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
564 nfssvc_release_fhandle(struct svc_rqst *rqstp)
566 struct nfsd_fhandle *resp = rqstp->rq_resp;