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v3.5.6
 
  1/*
  2 * XDR support for nfsd
  3 *
  4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  5 */
  6
 
  7#include "xdr.h"
  8#include "auth.h"
  9
 10#define NFSDDBG_FACILITY		NFSDDBG_XDR
 11
 12/*
 13 * Mapping of S_IF* types to NFS file types
 14 */
 15static u32	nfs_ftypes[] = {
 16	NFNON,  NFCHR,  NFCHR, NFBAD,
 17	NFDIR,  NFBAD,  NFBLK, NFBAD,
 18	NFREG,  NFBAD,  NFLNK, NFBAD,
 19	NFSOCK, NFBAD,  NFLNK, NFBAD,
 20};
 21
 22
 23/*
 24 * XDR functions for basic NFS types
 25 */
 26static __be32 *
 27decode_fh(__be32 *p, struct svc_fh *fhp)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 28{
 
 
 
 
 
 29	fh_init(fhp, NFS_FHSIZE);
 30	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
 31	fhp->fh_handle.fh_size = NFS_FHSIZE;
 32
 33	/* FIXME: Look up export pointer here and verify
 34	 * Sun Secure RPC if requested */
 35	return p + (NFS_FHSIZE >> 2);
 36}
 37
 38/* Helper function for NFSv2 ACL code */
 39__be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
 40{
 41	return decode_fh(p, fhp);
 42}
 43
 44static __be32 *
 45encode_fh(__be32 *p, struct svc_fh *fhp)
 46{
 47	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
 48	return p + (NFS_FHSIZE>> 2);
 
 49}
 50
 51/*
 52 * Decode a file name and make sure that the path contains
 53 * no slashes or null bytes.
 54 */
 55static __be32 *
 56decode_filename(__be32 *p, char **namp, unsigned int *lenp)
 57{
 58	char		*name;
 59	unsigned int	i;
 60
 61	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
 62		for (i = 0, name = *namp; i < *lenp; i++, name++) {
 63			if (*name == '\0' || *name == '/')
 64				return NULL;
 65		}
 66	}
 67
 68	return p;
 69}
 70
 71static __be32 *
 72decode_pathname(__be32 *p, char **namp, unsigned int *lenp)
 73{
 74	char		*name;
 75	unsigned int	i;
 
 
 
 
 
 
 
 
 
 76
 77	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
 78		for (i = 0, name = *namp; i < *lenp; i++, name++) {
 79			if (*name == '\0')
 80				return NULL;
 81		}
 82	}
 83
 84	return p;
 85}
 86
 87static __be32 *
 88decode_sattr(__be32 *p, struct iattr *iap)
 
 89{
 90	u32	tmp, tmp1;
 
 
 
 
 
 
 
 
 
 
 
 
 
 91
 92	iap->ia_valid = 0;
 93
 94	/* Sun client bug compatibility check: some sun clients seem to
 95	 * put 0xffff in the mode field when they mean 0xffffffff.
 96	 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
 97	 */
 98	if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
 
 99		iap->ia_valid |= ATTR_MODE;
100		iap->ia_mode = tmp;
101	}
102	if ((tmp = ntohl(*p++)) != (u32)-1) {
103		iap->ia_valid |= ATTR_UID;
104		iap->ia_uid = tmp;
 
 
 
105	}
106	if ((tmp = ntohl(*p++)) != (u32)-1) {
107		iap->ia_valid |= ATTR_GID;
108		iap->ia_gid = tmp;
 
 
 
109	}
110	if ((tmp = ntohl(*p++)) != (u32)-1) {
 
 
111		iap->ia_valid |= ATTR_SIZE;
112		iap->ia_size = tmp;
113	}
114	tmp  = ntohl(*p++); tmp1 = ntohl(*p++);
115	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
 
 
116		iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
117		iap->ia_atime.tv_sec = tmp;
118		iap->ia_atime.tv_nsec = tmp1 * 1000; 
119	}
120	tmp  = ntohl(*p++); tmp1 = ntohl(*p++);
121	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
 
 
122		iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
123		iap->ia_mtime.tv_sec = tmp;
124		iap->ia_mtime.tv_nsec = tmp1 * 1000; 
125		/*
126		 * Passing the invalid value useconds=1000000 for mtime
127		 * is a Sun convention for "set both mtime and atime to
128		 * current server time".  It's needed to make permissions
129		 * checks for the "touch" program across v2 mounts to
130		 * Solaris and Irix boxes work correctly. See description of
131		 * sattr in section 6.1 of "NFS Illustrated" by
132		 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
133		 */
134		if (tmp1 == 1000000)
135			iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
136	}
137	return p;
 
138}
139
140static __be32 *
141encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
142	     struct kstat *stat)
143{
144	struct dentry	*dentry = fhp->fh_dentry;
145	int type;
146	struct timespec time;
147	u32 f;
148
149	type = (stat->mode & S_IFMT);
150
151	*p++ = htonl(nfs_ftypes[type >> 12]);
152	*p++ = htonl((u32) stat->mode);
153	*p++ = htonl((u32) stat->nlink);
154	*p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
155	*p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
156
157	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
158		*p++ = htonl(NFS_MAXPATHLEN);
159	} else {
160		*p++ = htonl((u32) stat->size);
161	}
162	*p++ = htonl((u32) stat->blksize);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
163	if (S_ISCHR(type) || S_ISBLK(type))
164		*p++ = htonl(new_encode_dev(stat->rdev));
165	else
166		*p++ = htonl(0xffffffff);
167	*p++ = htonl((u32) stat->blocks);
 
168	switch (fsid_source(fhp)) {
169	default:
170	case FSIDSOURCE_DEV:
171		*p++ = htonl(new_encode_dev(stat->dev));
172		break;
173	case FSIDSOURCE_FSID:
174		*p++ = htonl((u32) fhp->fh_export->ex_fsid);
175		break;
176	case FSIDSOURCE_UUID:
177		f = ((u32*)fhp->fh_export->ex_uuid)[0];
178		f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
179		f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
180		f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
181		*p++ = htonl(f);
 
 
182		break;
183	}
184	*p++ = htonl((u32) stat->ino);
185	*p++ = htonl((u32) stat->atime.tv_sec);
186	*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
187	lease_get_mtime(dentry->d_inode, &time); 
188	*p++ = htonl((u32) time.tv_sec);
189	*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); 
190	*p++ = htonl((u32) stat->ctime.tv_sec);
191	*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
192
193	return p;
194}
 
 
 
 
195
196/* Helper function for NFSv2 ACL code */
197__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
198{
199	struct kstat stat;
200	vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, &stat);
201	return encode_fattr(rqstp, p, fhp, &stat);
202}
203
204/*
205 * XDR decode functions
206 */
207int
208nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
209{
210	return xdr_argsize_check(rqstp, p);
211}
212
213int
214nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
215{
216	if (!(p = decode_fh(p, &args->fh)))
217		return 0;
218	return xdr_argsize_check(rqstp, p);
 
219}
220
221int
222nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
223					struct nfsd_sattrargs *args)
224{
225	p = decode_fh(p, &args->fh);
226	if (!p)
227		return 0;
228	p = decode_sattr(p, &args->attrs);
229
230	return xdr_argsize_check(rqstp, p);
 
231}
232
233int
234nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
235					struct nfsd_diropargs *args)
236{
237	if (!(p = decode_fh(p, &args->fh))
238	 || !(p = decode_filename(p, &args->name, &args->len)))
239		return 0;
240
241	 return xdr_argsize_check(rqstp, p);
242}
243
244int
245nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
246					struct nfsd_readargs *args)
247{
248	unsigned int len;
249	int v,pn;
250	if (!(p = decode_fh(p, &args->fh)))
251		return 0;
252
253	args->offset    = ntohl(*p++);
254	len = args->count     = ntohl(*p++);
255	p++; /* totalcount - unused */
256
257	if (len > NFSSVC_MAXBLKSIZE_V2)
258		len = NFSSVC_MAXBLKSIZE_V2;
 
 
 
 
 
 
 
259
260	/* set up somewhere to store response.
261	 * We take pages, put them on reslist and include in iovec
262	 */
263	v=0;
264	while (len > 0) {
265		pn = rqstp->rq_resused++;
266		rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
267		rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
268		len -= rqstp->rq_vec[v].iov_len;
269		v++;
270	}
271	args->vlen = v;
272	return xdr_argsize_check(rqstp, p);
273}
274
275int
276nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
277					struct nfsd_writeargs *args)
278{
279	unsigned int len, hdr, dlen;
280	int v;
 
 
 
 
281
282	if (!(p = decode_fh(p, &args->fh)))
283		return 0;
284
285	p++;				/* beginoffset */
286	args->offset = ntohl(*p++);	/* offset */
287	p++;				/* totalcount */
288	len = args->len = ntohl(*p++);
289	/*
290	 * The protocol specifies a maximum of 8192 bytes.
291	 */
292	if (len > NFSSVC_MAXBLKSIZE_V2)
293		return 0;
294
295	/*
296	 * Check to make sure that we got the right number of
297	 * bytes.
298	 */
299	hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
300	dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
301		- hdr;
302
303	/*
304	 * Round the length of the data which was specified up to
305	 * the next multiple of XDR units and then compare that
306	 * against the length which was actually received.
307	 * Note that when RPCSEC/GSS (for example) is used, the
308	 * data buffer can be padded so dlen might be larger
309	 * than required.  It must never be smaller.
310	 */
311	if (dlen < XDR_QUADLEN(len)*4)
312		return 0;
 
 
 
 
 
 
313
314	rqstp->rq_vec[0].iov_base = (void*)p;
315	rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
316	v = 0;
317	while (len > rqstp->rq_vec[v].iov_len) {
318		len -= rqstp->rq_vec[v].iov_len;
319		v++;
320		rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
321		rqstp->rq_vec[v].iov_len = PAGE_SIZE;
322	}
323	rqstp->rq_vec[v].iov_len = len;
324	args->vlen = v + 1;
325	return 1;
326}
327
328int
329nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
330					struct nfsd_createargs *args)
331{
332	if (   !(p = decode_fh(p, &args->fh))
333	    || !(p = decode_filename(p, &args->name, &args->len)))
334		return 0;
335	p = decode_sattr(p, &args->attrs);
336
337	return xdr_argsize_check(rqstp, p);
 
 
338}
339
340int
341nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
342					struct nfsd_renameargs *args)
343{
344	if (!(p = decode_fh(p, &args->ffh))
345	 || !(p = decode_filename(p, &args->fname, &args->flen))
346	 || !(p = decode_fh(p, &args->tfh))
347	 || !(p = decode_filename(p, &args->tname, &args->tlen)))
348		return 0;
349
350	return xdr_argsize_check(rqstp, p);
 
 
 
351}
352
353int
354nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
355{
356	if (!(p = decode_fh(p, &args->fh)))
357		return 0;
358	args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
359
360	return xdr_argsize_check(rqstp, p);
 
 
361}
362
363int
364nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
365					struct nfsd_linkargs *args)
366{
367	if (!(p = decode_fh(p, &args->ffh))
368	 || !(p = decode_fh(p, &args->tfh))
369	 || !(p = decode_filename(p, &args->tname, &args->tlen)))
370		return 0;
371
372	return xdr_argsize_check(rqstp, p);
373}
374
375int
376nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
377					struct nfsd_symlinkargs *args)
378{
379	if (   !(p = decode_fh(p, &args->ffh))
380	    || !(p = decode_filename(p, &args->fname, &args->flen))
381	    || !(p = decode_pathname(p, &args->tname, &args->tlen)))
382		return 0;
383	p = decode_sattr(p, &args->attrs);
384
385	return xdr_argsize_check(rqstp, p);
 
 
 
 
386}
387
388int
389nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
390					struct nfsd_readdirargs *args)
391{
392	if (!(p = decode_fh(p, &args->fh)))
393		return 0;
394	args->cookie = ntohl(*p++);
395	args->count  = ntohl(*p++);
396	if (args->count > PAGE_SIZE)
397		args->count = PAGE_SIZE;
398
399	args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 
 
 
 
 
400
401	return xdr_argsize_check(rqstp, p);
402}
403
404/*
405 * XDR encode functions
406 */
 
407int
408nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
409{
410	return xdr_ressize_check(rqstp, p);
 
 
 
411}
412
413int
414nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
415					struct nfsd_attrstat *resp)
416{
417	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
418	return xdr_ressize_check(rqstp, p);
 
 
 
 
 
 
 
 
 
 
 
419}
420
421int
422nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
423					struct nfsd_diropres *resp)
424{
425	p = encode_fh(p, &resp->fh);
426	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
427	return xdr_ressize_check(rqstp, p);
 
 
 
 
 
 
 
 
 
 
 
 
428}
429
430int
431nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
432					struct nfsd_readlinkres *resp)
433{
434	*p++ = htonl(resp->len);
435	xdr_ressize_check(rqstp, p);
436	rqstp->rq_res.page_len = resp->len;
437	if (resp->len & 3) {
438		/* need to pad the tail */
439		rqstp->rq_res.tail[0].iov_base = p;
440		*p = 0;
441		rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
 
 
 
 
 
 
442	}
 
443	return 1;
444}
445
446int
447nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
448					struct nfsd_readres *resp)
449{
450	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
451	*p++ = htonl(resp->count);
452	xdr_ressize_check(rqstp, p);
453
454	/* now update rqstp->rq_res to reflect data as well */
455	rqstp->rq_res.page_len = resp->count;
456	if (resp->count & 3) {
457		/* need to pad the tail */
458		rqstp->rq_res.tail[0].iov_base = p;
459		*p = 0;
460		rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
 
 
 
 
 
 
461	}
 
462	return 1;
463}
464
465int
466nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
467					struct nfsd_readdirres *resp)
468{
469	xdr_ressize_check(rqstp, p);
470	p = resp->buffer;
471	*p++ = 0;			/* no more entries */
472	*p++ = htonl((resp->common.err == nfserr_eof));
473	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
 
 
 
 
 
 
 
 
 
 
 
474
475	return 1;
476}
477
478int
479nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
480					struct nfsd_statfsres *resp)
481{
 
 
482	struct kstatfs	*stat = &resp->stats;
483
484	*p++ = htonl(NFSSVC_MAXBLKSIZE_V2);	/* max transfer size */
485	*p++ = htonl(stat->f_bsize);
486	*p++ = htonl(stat->f_blocks);
487	*p++ = htonl(stat->f_bfree);
488	*p++ = htonl(stat->f_bavail);
489	return xdr_ressize_check(rqstp, p);
 
 
 
 
 
 
 
 
 
 
490}
491
492int
493nfssvc_encode_entry(void *ccdv, const char *name,
494		    int namlen, loff_t offset, u64 ino, unsigned int d_type)
495{
496	struct readdir_cd *ccd = ccdv;
497	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
498	__be32	*p = cd->buffer;
499	int	buflen, slen;
 
 
 
500
501	/*
502	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
503			namlen, name, offset, ino);
504	 */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
505
506	if (offset > ~((u32) 0)) {
507		cd->common.err = nfserr_fbig;
508		return -EINVAL;
509	}
510	if (cd->offset)
511		*cd->offset = htonl(offset);
512	if (namlen > NFS2_MAXNAMLEN)
513		namlen = NFS2_MAXNAMLEN;/* truncate filename */
514
515	slen = XDR_QUADLEN(namlen);
516	if ((buflen = cd->buflen - slen - 4) < 0) {
517		cd->common.err = nfserr_toosmall;
518		return -EINVAL;
519	}
520	if (ino > ~((u32) 0)) {
521		cd->common.err = nfserr_fbig;
522		return -EINVAL;
523	}
524	*p++ = xdr_one;				/* mark entry present */
525	*p++ = htonl((u32) ino);		/* file id */
526	p    = xdr_encode_array(p, name, namlen);/* name length & name */
527	cd->offset = p;			/* remember pointer */
528	*p++ = htonl(~0U);		/* offset of next entry */
529
530	cd->buflen = buflen;
531	cd->buffer = p;
532	cd->common.err = nfs_ok;
533	return 0;
 
 
 
 
 
 
534}
535
536/*
537 * XDR release functions
538 */
539int
540nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
541					struct nfsd_fhandle *resp)
542{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
543	fh_put(&resp->fh);
544	return 1;
545}
v5.14.15
  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * XDR support for nfsd
  4 *
  5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  6 */
  7
  8#include "vfs.h"
  9#include "xdr.h"
 10#include "auth.h"
 11
 
 
 12/*
 13 * Mapping of S_IF* types to NFS file types
 14 */
 15static const u32 nfs_ftypes[] = {
 16	NFNON,  NFCHR,  NFCHR, NFBAD,
 17	NFDIR,  NFBAD,  NFBLK, NFBAD,
 18	NFREG,  NFBAD,  NFLNK, NFBAD,
 19	NFSOCK, NFBAD,  NFLNK, NFBAD,
 20};
 21
 22
 23/*
 24 * Basic NFSv2 data types (RFC 1094 Section 2.3)
 25 */
 26
 27/**
 28 * svcxdr_encode_stat - Encode an NFSv2 status code
 29 * @xdr: XDR stream
 30 * @status: status value to encode
 31 *
 32 * Return values:
 33 *   %false: Send buffer space was exhausted
 34 *   %true: Success
 35 */
 36bool
 37svcxdr_encode_stat(struct xdr_stream *xdr, __be32 status)
 38{
 39	__be32 *p;
 40
 41	p = xdr_reserve_space(xdr, sizeof(status));
 42	if (!p)
 43		return false;
 44	*p = status;
 45
 46	return true;
 47}
 48
 49/**
 50 * svcxdr_decode_fhandle - Decode an NFSv2 file handle
 51 * @xdr: XDR stream positioned at an encoded NFSv2 FH
 52 * @fhp: OUT: filled-in server file handle
 53 *
 54 * Return values:
 55 *  %false: The encoded file handle was not valid
 56 *  %true: @fhp has been initialized
 57 */
 58bool
 59svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp)
 60{
 61	__be32 *p;
 62
 63	p = xdr_inline_decode(xdr, NFS_FHSIZE);
 64	if (!p)
 65		return false;
 66	fh_init(fhp, NFS_FHSIZE);
 67	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
 68	fhp->fh_handle.fh_size = NFS_FHSIZE;
 69
 70	return true;
 
 
 71}
 72
 73static bool
 74svcxdr_encode_fhandle(struct xdr_stream *xdr, const struct svc_fh *fhp)
 75{
 76	__be32 *p;
 
 77
 78	p = xdr_reserve_space(xdr, NFS_FHSIZE);
 79	if (!p)
 80		return false;
 81	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
 82
 83	return true;
 84}
 85
 
 
 
 
 86static __be32 *
 87encode_timeval(__be32 *p, const struct timespec64 *time)
 88{
 89	*p++ = cpu_to_be32((u32)time->tv_sec);
 90	if (time->tv_nsec)
 91		*p++ = cpu_to_be32(time->tv_nsec / NSEC_PER_USEC);
 92	else
 93		*p++ = xdr_zero;
 
 
 
 
 
 94	return p;
 95}
 96
 97static bool
 98svcxdr_decode_filename(struct xdr_stream *xdr, char **name, unsigned int *len)
 99{
100	u32 size, i;
101	__be32 *p;
102	char *c;
103
104	if (xdr_stream_decode_u32(xdr, &size) < 0)
105		return false;
106	if (size == 0 || size > NFS_MAXNAMLEN)
107		return false;
108	p = xdr_inline_decode(xdr, size);
109	if (!p)
110		return false;
111
112	*len = size;
113	*name = (char *)p;
114	for (i = 0, c = *name; i < size; i++, c++)
115		if (*c == '\0' || *c == '/')
116			return false;
 
117
118	return true;
119}
120
121static bool
122svcxdr_decode_diropargs(struct xdr_stream *xdr, struct svc_fh *fhp,
123			char **name, unsigned int *len)
124{
125	return svcxdr_decode_fhandle(xdr, fhp) &&
126		svcxdr_decode_filename(xdr, name, len);
127}
128
129static bool
130svcxdr_decode_sattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
131		    struct iattr *iap)
132{
133	u32 tmp1, tmp2;
134	__be32 *p;
135
136	p = xdr_inline_decode(xdr, XDR_UNIT * 8);
137	if (!p)
138		return false;
139
140	iap->ia_valid = 0;
141
142	/*
143	 * Some Sun clients put 0xffff in the mode field when they
144	 * mean 0xffffffff.
145	 */
146	tmp1 = be32_to_cpup(p++);
147	if (tmp1 != (u32)-1 && tmp1 != 0xffff) {
148		iap->ia_valid |= ATTR_MODE;
149		iap->ia_mode = tmp1;
150	}
151
152	tmp1 = be32_to_cpup(p++);
153	if (tmp1 != (u32)-1) {
154		iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1);
155		if (uid_valid(iap->ia_uid))
156			iap->ia_valid |= ATTR_UID;
157	}
158
159	tmp1 = be32_to_cpup(p++);
160	if (tmp1 != (u32)-1) {
161		iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1);
162		if (gid_valid(iap->ia_gid))
163			iap->ia_valid |= ATTR_GID;
164	}
165
166	tmp1 = be32_to_cpup(p++);
167	if (tmp1 != (u32)-1) {
168		iap->ia_valid |= ATTR_SIZE;
169		iap->ia_size = tmp1;
170	}
171
172	tmp1 = be32_to_cpup(p++);
173	tmp2 = be32_to_cpup(p++);
174	if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
175		iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
176		iap->ia_atime.tv_sec = tmp1;
177		iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC;
178	}
179
180	tmp1 = be32_to_cpup(p++);
181	tmp2 = be32_to_cpup(p++);
182	if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
183		iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
184		iap->ia_mtime.tv_sec = tmp1;
185		iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC;
186		/*
187		 * Passing the invalid value useconds=1000000 for mtime
188		 * is a Sun convention for "set both mtime and atime to
189		 * current server time".  It's needed to make permissions
190		 * checks for the "touch" program across v2 mounts to
191		 * Solaris and Irix boxes work correctly. See description of
192		 * sattr in section 6.1 of "NFS Illustrated" by
193		 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
194		 */
195		if (tmp2 == 1000000)
196			iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
197	}
198
199	return true;
200}
201
202/**
203 * svcxdr_encode_fattr - Encode NFSv2 file attributes
204 * @rqstp: Context of a completed RPC transaction
205 * @xdr: XDR stream
206 * @fhp: File handle to encode
207 * @stat: Attributes to encode
208 *
209 * Return values:
210 *   %false: Send buffer space was exhausted
211 *   %true: Success
212 */
213bool
214svcxdr_encode_fattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
215		    const struct svc_fh *fhp, const struct kstat *stat)
216{
217	struct user_namespace *userns = nfsd_user_namespace(rqstp);
218	struct dentry *dentry = fhp->fh_dentry;
219	int type = stat->mode & S_IFMT;
220	struct timespec64 time;
221	__be32 *p;
222	u32 fsid;
223
224	p = xdr_reserve_space(xdr, XDR_UNIT * 17);
225	if (!p)
226		return false;
227
228	*p++ = cpu_to_be32(nfs_ftypes[type >> 12]);
229	*p++ = cpu_to_be32((u32)stat->mode);
230	*p++ = cpu_to_be32((u32)stat->nlink);
231	*p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid));
232	*p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid));
233
234	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN)
235		*p++ = cpu_to_be32(NFS_MAXPATHLEN);
236	else
237		*p++ = cpu_to_be32((u32) stat->size);
238	*p++ = cpu_to_be32((u32) stat->blksize);
239	if (S_ISCHR(type) || S_ISBLK(type))
240		*p++ = cpu_to_be32(new_encode_dev(stat->rdev));
241	else
242		*p++ = cpu_to_be32(0xffffffff);
243	*p++ = cpu_to_be32((u32)stat->blocks);
244
245	switch (fsid_source(fhp)) {
 
 
 
 
246	case FSIDSOURCE_FSID:
247		fsid = (u32)fhp->fh_export->ex_fsid;
248		break;
249	case FSIDSOURCE_UUID:
250		fsid = ((u32 *)fhp->fh_export->ex_uuid)[0];
251		fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[1];
252		fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[2];
253		fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[3];
254		break;
255	default:
256		fsid = new_encode_dev(stat->dev);
257		break;
258	}
259	*p++ = cpu_to_be32(fsid);
 
 
 
 
 
 
 
260
261	*p++ = cpu_to_be32((u32)stat->ino);
262	p = encode_timeval(p, &stat->atime);
263	time = stat->mtime;
264	lease_get_mtime(d_inode(dentry), &time);
265	p = encode_timeval(p, &time);
266	encode_timeval(p, &stat->ctime);
267
268	return true;
 
 
 
 
 
269}
270
271/*
272 * XDR decode functions
273 */
 
 
 
 
 
274
275int
276nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
277{
278	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
279	struct nfsd_fhandle *args = rqstp->rq_argp;
280
281	return svcxdr_decode_fhandle(xdr, &args->fh);
282}
283
284int
285nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
 
286{
287	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
288	struct nfsd_sattrargs *args = rqstp->rq_argp;
 
 
289
290	return svcxdr_decode_fhandle(xdr, &args->fh) &&
291		svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
292}
293
294int
295nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
 
296{
297	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
298	struct nfsd_diropargs *args = rqstp->rq_argp;
 
299
300	return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
301}
302
303int
304nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
 
305{
306	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
307	struct nfsd_readargs *args = rqstp->rq_argp;
308	u32 totalcount;
 
 
 
 
 
309
310	if (!svcxdr_decode_fhandle(xdr, &args->fh))
311		return 0;
312	if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
313		return 0;
314	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
315		return 0;
316	/* totalcount is ignored */
317	if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
318		return 0;
319
320	return 1;
 
 
 
 
 
 
 
 
 
 
 
 
321}
322
323int
324nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
 
325{
326	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
327	struct nfsd_writeargs *args = rqstp->rq_argp;
328	struct kvec *head = rqstp->rq_arg.head;
329	struct kvec *tail = rqstp->rq_arg.tail;
330	u32 beginoffset, totalcount;
331	size_t remaining;
332
333	if (!svcxdr_decode_fhandle(xdr, &args->fh))
334		return 0;
335	/* beginoffset is ignored */
336	if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
337		return 0;
338	if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
339		return 0;
340	/* totalcount is ignored */
341	if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
 
 
342		return 0;
343
344	/* opaque data */
345	if (xdr_stream_decode_u32(xdr, &args->len) < 0)
346		return 0;
347	if (args->len > NFSSVC_MAXBLKSIZE_V2)
 
 
 
 
 
 
 
 
 
 
 
 
 
348		return 0;
349	remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
350	remaining -= xdr_stream_pos(xdr);
351	if (remaining < xdr_align_size(args->len))
352		return 0;
353	args->first.iov_base = xdr->p;
354	args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
355
 
 
 
 
 
 
 
 
 
 
 
356	return 1;
357}
358
359int
360nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
 
361{
362	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
363	struct nfsd_createargs *args = rqstp->rq_argp;
 
 
364
365	return svcxdr_decode_diropargs(xdr, &args->fh,
366				       &args->name, &args->len) &&
367		svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
368}
369
370int
371nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
 
372{
373	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
374	struct nfsd_renameargs *args = rqstp->rq_argp;
 
 
 
375
376	return svcxdr_decode_diropargs(xdr, &args->ffh,
377				       &args->fname, &args->flen) &&
378		svcxdr_decode_diropargs(xdr, &args->tfh,
379					&args->tname, &args->tlen);
380}
381
382int
383nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
384{
385	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
386	struct nfsd_linkargs *args = rqstp->rq_argp;
 
387
388	return svcxdr_decode_fhandle(xdr, &args->ffh) &&
389		svcxdr_decode_diropargs(xdr, &args->tfh,
390					&args->tname, &args->tlen);
391}
392
393int
394nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
 
395{
396	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
397	struct nfsd_symlinkargs *args = rqstp->rq_argp;
398	struct kvec *head = rqstp->rq_arg.head;
 
 
 
 
399
400	if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
401		return 0;
402	if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
403		return 0;
404	if (args->tlen == 0)
 
 
405		return 0;
 
406
407	args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
408	args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
409	if (!args->first.iov_base)
410		return 0;
411	return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
412}
413
414int
415nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
 
416{
417	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
418	struct nfsd_readdirargs *args = rqstp->rq_argp;
 
 
 
 
419
420	if (!svcxdr_decode_fhandle(xdr, &args->fh))
421		return 0;
422	if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
423		return 0;
424	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
425		return 0;
426
427	return 1;
428}
429
430/*
431 * XDR encode functions
432 */
433
434int
435nfssvc_encode_statres(struct svc_rqst *rqstp, __be32 *p)
436{
437	struct xdr_stream *xdr = &rqstp->rq_res_stream;
438	struct nfsd_stat *resp = rqstp->rq_resp;
439
440	return svcxdr_encode_stat(xdr, resp->status);
441}
442
443int
444nfssvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)
 
445{
446	struct xdr_stream *xdr = &rqstp->rq_res_stream;
447	struct nfsd_attrstat *resp = rqstp->rq_resp;
448
449	if (!svcxdr_encode_stat(xdr, resp->status))
450		return 0;
451	switch (resp->status) {
452	case nfs_ok:
453		if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
454			return 0;
455		break;
456	}
457
458	return 1;
459}
460
461int
462nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
 
463{
464	struct xdr_stream *xdr = &rqstp->rq_res_stream;
465	struct nfsd_diropres *resp = rqstp->rq_resp;
466
467	if (!svcxdr_encode_stat(xdr, resp->status))
468		return 0;
469	switch (resp->status) {
470	case nfs_ok:
471		if (!svcxdr_encode_fhandle(xdr, &resp->fh))
472			return 0;
473		if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
474			return 0;
475		break;
476	}
477
478	return 1;
479}
480
481int
482nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
 
483{
484	struct xdr_stream *xdr = &rqstp->rq_res_stream;
485	struct nfsd_readlinkres *resp = rqstp->rq_resp;
486	struct kvec *head = rqstp->rq_res.head;
487
488	if (!svcxdr_encode_stat(xdr, resp->status))
489		return 0;
490	switch (resp->status) {
491	case nfs_ok:
492		if (xdr_stream_encode_u32(xdr, resp->len) < 0)
493			return 0;
494		xdr_write_pages(xdr, &resp->page, 0, resp->len);
495		if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
496			return 0;
497		break;
498	}
499
500	return 1;
501}
502
503int
504nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
 
505{
506	struct xdr_stream *xdr = &rqstp->rq_res_stream;
507	struct nfsd_readres *resp = rqstp->rq_resp;
508	struct kvec *head = rqstp->rq_res.head;
509
510	if (!svcxdr_encode_stat(xdr, resp->status))
511		return 0;
512	switch (resp->status) {
513	case nfs_ok:
514		if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
515			return 0;
516		if (xdr_stream_encode_u32(xdr, resp->count) < 0)
517			return 0;
518		xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
519				resp->count);
520		if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
521			return 0;
522		break;
523	}
524
525	return 1;
526}
527
528int
529nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
 
530{
531	struct xdr_stream *xdr = &rqstp->rq_res_stream;
532	struct nfsd_readdirres *resp = rqstp->rq_resp;
533	struct xdr_buf *dirlist = &resp->dirlist;
534
535	if (!svcxdr_encode_stat(xdr, resp->status))
536		return 0;
537	switch (resp->status) {
538	case nfs_ok:
539		xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
540		/* no more entries */
541		if (xdr_stream_encode_item_absent(xdr) < 0)
542			return 0;
543		if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
544			return 0;
545		break;
546	}
547
548	return 1;
549}
550
551int
552nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p)
 
553{
554	struct xdr_stream *xdr = &rqstp->rq_res_stream;
555	struct nfsd_statfsres *resp = rqstp->rq_resp;
556	struct kstatfs	*stat = &resp->stats;
557
558	if (!svcxdr_encode_stat(xdr, resp->status))
559		return 0;
560	switch (resp->status) {
561	case nfs_ok:
562		p = xdr_reserve_space(xdr, XDR_UNIT * 5);
563		if (!p)
564			return 0;
565		*p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2);
566		*p++ = cpu_to_be32(stat->f_bsize);
567		*p++ = cpu_to_be32(stat->f_blocks);
568		*p++ = cpu_to_be32(stat->f_bfree);
569		*p = cpu_to_be32(stat->f_bavail);
570		break;
571	}
572
573	return 1;
574}
575
576/**
577 * nfssvc_encode_nfscookie - Encode a directory offset cookie
578 * @resp: readdir result context
579 * @offset: offset cookie to encode
580 *
581 * The buffer space for the offset cookie has already been reserved
582 * by svcxdr_encode_entry_common().
583 */
584void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset)
585{
586	__be32 cookie = cpu_to_be32(offset);
587
588	if (!resp->cookie_offset)
589		return;
590
591	write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
592			       sizeof(cookie));
593	resp->cookie_offset = 0;
594}
595
596static bool
597svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name,
598			   int namlen, loff_t offset, u64 ino)
599{
600	struct xdr_buf *dirlist = &resp->dirlist;
601	struct xdr_stream *xdr = &resp->xdr;
602
603	if (xdr_stream_encode_item_present(xdr) < 0)
604		return false;
605	/* fileid */
606	if (xdr_stream_encode_u32(xdr, (u32)ino) < 0)
607		return false;
608	/* name */
609	if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0)
610		return false;
611	/* cookie */
612	resp->cookie_offset = dirlist->len;
613	if (xdr_stream_encode_u32(xdr, ~0U) < 0)
614		return false;
615
616	return true;
617}
618
619/**
620 * nfssvc_encode_entry - encode one NFSv2 READDIR entry
621 * @data: directory context
622 * @name: name of the object to be encoded
623 * @namlen: length of that name, in bytes
624 * @offset: the offset of the previous entry
625 * @ino: the fileid of this entry
626 * @d_type: unused
627 *
628 * Return values:
629 *   %0: Entry was successfully encoded.
630 *   %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
631 *
632 * On exit, the following fields are updated:
633 *   - resp->xdr
634 *   - resp->common.err
635 *   - resp->cookie_offset
636 */
637int nfssvc_encode_entry(void *data, const char *name, int namlen,
638			loff_t offset, u64 ino, unsigned int d_type)
639{
640	struct readdir_cd *ccd = data;
641	struct nfsd_readdirres *resp = container_of(ccd,
642						    struct nfsd_readdirres,
643						    common);
644	unsigned int starting_length = resp->dirlist.len;
645
646	/* The offset cookie for the previous entry */
647	nfssvc_encode_nfscookie(resp, offset);
648
649	if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino))
650		goto out_toosmall;
651
652	xdr_commit_encode(&resp->xdr);
653	resp->common.err = nfs_ok;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
654	return 0;
655
656out_toosmall:
657	resp->cookie_offset = 0;
658	resp->common.err = nfserr_toosmall;
659	resp->dirlist.len = starting_length;
660	return -EINVAL;
661}
662
663/*
664 * XDR release functions
665 */
666void nfssvc_release_attrstat(struct svc_rqst *rqstp)
 
 
667{
668	struct nfsd_attrstat *resp = rqstp->rq_resp;
669
670	fh_put(&resp->fh);
671}
672
673void nfssvc_release_diropres(struct svc_rqst *rqstp)
674{
675	struct nfsd_diropres *resp = rqstp->rq_resp;
676
677	fh_put(&resp->fh);
678}
679
680void nfssvc_release_readres(struct svc_rqst *rqstp)
681{
682	struct nfsd_readres *resp = rqstp->rq_resp;
683
684	fh_put(&resp->fh);
 
685}