blob: caf6355b18fa99769850d41ab88db0f8330848fb [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * XDR support for nfsd
4 *
5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
6 */
7
Al Viro3dadecc2013-01-24 02:18:08 -05008#include "vfs.h"
Boaz Harrosh9a74af22009-12-03 20:30:56 +02009#include "xdr.h"
J. Bruce Fields2e8138a2007-11-15 17:05:43 -050010#include "auth.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
Linus Torvalds1da177e2005-04-16 15:20:36 -070012/*
13 * Mapping of S_IF* types to NFS file types
14 */
Chuck Lever92b54a42020-10-23 15:28:59 -040015static const u32 nfs_ftypes[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 NFNON, NFCHR, NFCHR, NFBAD,
17 NFDIR, NFBAD, NFBLK, NFBAD,
18 NFREG, NFBAD, NFLNK, NFBAD,
19 NFSOCK, NFBAD, NFLNK, NFBAD,
20};
21
22
23/*
Chuck Leverebcd8e82020-10-21 12:14:23 -040024 * Basic NFSv2 data types (RFC 1094 Section 2.3)
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 */
Chuck Leverebcd8e82020-10-21 12:14:23 -040026
Chuck Leverf8cba4732020-11-18 14:38:47 -050027/**
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
Chuck Levera887eae2020-10-23 11:08:02 -040037svcxdr_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
Chuck Lever635a45d2020-11-17 11:32:04 -050049/**
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
Chuck Leverebcd8e82020-10-21 12:14:23 -040059svcxdr_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);
NeilBrownd8b26072021-09-02 11:16:32 +100067 memcpy(&fhp->fh_handle.fh_raw, p, NFS_FHSIZE);
Chuck Leverebcd8e82020-10-21 12:14:23 -040068 fhp->fh_handle.fh_size = NFS_FHSIZE;
69
70 return true;
71}
72
Chuck Levere3b4ef22020-10-23 16:44:16 -040073static bool
74svcxdr_encode_fhandle(struct xdr_stream *xdr, const struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
Chuck Levere3b4ef22020-10-23 16:44:16 -040076 __be32 *p;
77
78 p = xdr_reserve_space(xdr, NFS_FHSIZE);
79 if (!p)
80 return false;
NeilBrownd8b26072021-09-02 11:16:32 +100081 memcpy(p, &fhp->fh_handle.fh_raw, NFS_FHSIZE);
Chuck Levere3b4ef22020-10-23 16:44:16 -040082
83 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084}
85
Chuck Lever92b54a42020-10-23 15:28:59 -040086static __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
Chuck Lever6d742c12020-10-19 14:33:24 -040097static 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
Chuck Lever2fdd6bd2020-10-21 12:39:06 -0400129static 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
Chuck Leverf8cba4732020-11-18 14:38:47 -0500202/**
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
Chuck Lever92b54a42020-10-23 15:28:59 -0400214svcxdr_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)
Chuck Levere3b4ef22020-10-23 16:44:16 -0400226 return false;
Chuck Lever92b54a42020-10-23 15:28:59 -0400227
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
Chuck Levere3b4ef22020-10-23 16:44:16 -0400268 return true;
Chuck Lever92b54a42020-10-23 15:28:59 -0400269}
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271/*
272 * XDR decode functions
273 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Chuck Leverc44b31c2021-10-12 11:57:28 -0400275bool
Chuck Lever16c66362021-10-12 11:57:22 -0400276nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
Christoph Hellwig026fec72017-05-08 19:01:48 +0200278 struct nfsd_fhandle *args = rqstp->rq_argp;
279
Chuck Leverebcd8e82020-10-21 12:14:23 -0400280 return svcxdr_decode_fhandle(xdr, &args->fh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281}
282
Chuck Leverc44b31c2021-10-12 11:57:28 -0400283bool
Chuck Lever16c66362021-10-12 11:57:22 -0400284nfssvc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285{
Christoph Hellwig026fec72017-05-08 19:01:48 +0200286 struct nfsd_sattrargs *args = rqstp->rq_argp;
287
Chuck Lever2fdd6bd2020-10-21 12:39:06 -0400288 return svcxdr_decode_fhandle(xdr, &args->fh) &&
289 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291
Chuck Leverc44b31c2021-10-12 11:57:28 -0400292bool
Chuck Lever16c66362021-10-12 11:57:22 -0400293nfssvc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
Christoph Hellwig026fec72017-05-08 19:01:48 +0200295 struct nfsd_diropargs *args = rqstp->rq_argp;
296
Chuck Lever6d742c12020-10-19 14:33:24 -0400297 return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
Chuck Leverc44b31c2021-10-12 11:57:28 -0400300bool
Chuck Lever16c66362021-10-12 11:57:22 -0400301nfssvc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
Christoph Hellwig026fec72017-05-08 19:01:48 +0200303 struct nfsd_readargs *args = rqstp->rq_argp;
Chuck Lever8c293ef2020-10-21 12:15:51 -0400304 u32 totalcount;
305
306 if (!svcxdr_decode_fhandle(xdr, &args->fh))
Chuck Leverc44b31c2021-10-12 11:57:28 -0400307 return false;
Chuck Lever8c293ef2020-10-21 12:15:51 -0400308 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400309 return false;
Chuck Lever8c293ef2020-10-21 12:15:51 -0400310 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400311 return false;
Chuck Lever8c293ef2020-10-21 12:15:51 -0400312 /* totalcount is ignored */
313 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400314 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Chuck Leverc44b31c2021-10-12 11:57:28 -0400316 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318
Chuck Leverc44b31c2021-10-12 11:57:28 -0400319bool
Chuck Lever16c66362021-10-12 11:57:22 -0400320nfssvc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Christoph Hellwig026fec72017-05-08 19:01:48 +0200322 struct nfsd_writeargs *args = rqstp->rq_argp;
Chuck Levera51b5b72020-10-21 12:18:36 -0400323 u32 beginoffset, totalcount;
Peter Staubachf34b95682007-05-09 02:34:48 -0700324
Chuck Levera51b5b72020-10-21 12:18:36 -0400325 if (!svcxdr_decode_fhandle(xdr, &args->fh))
Chuck Leverc44b31c2021-10-12 11:57:28 -0400326 return false;
Chuck Levera51b5b72020-10-21 12:18:36 -0400327 /* beginoffset is ignored */
328 if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400329 return false;
Chuck Levera51b5b72020-10-21 12:18:36 -0400330 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400331 return false;
Chuck Levera51b5b72020-10-21 12:18:36 -0400332 /* totalcount is ignored */
333 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400334 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Chuck Levera51b5b72020-10-21 12:18:36 -0400336 /* opaque data */
337 if (xdr_stream_decode_u32(xdr, &args->len) < 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400338 return false;
Chuck Levera51b5b72020-10-21 12:18:36 -0400339 if (args->len > NFSSVC_MAXBLKSIZE_V2)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400340 return false;
Peter Staubachf34b95682007-05-09 02:34:48 -0700341
Chuck Leverd4da5ba2022-09-12 17:23:07 -0400342 return xdr_stream_subsegment(xdr, &args->payload, args->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343}
344
Chuck Leverc44b31c2021-10-12 11:57:28 -0400345bool
Chuck Lever16c66362021-10-12 11:57:22 -0400346nfssvc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
Christoph Hellwig026fec72017-05-08 19:01:48 +0200348 struct nfsd_createargs *args = rqstp->rq_argp;
349
Chuck Lever7dcf65b2020-10-21 12:43:58 -0400350 return svcxdr_decode_diropargs(xdr, &args->fh,
351 &args->name, &args->len) &&
352 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353}
354
Chuck Leverc44b31c2021-10-12 11:57:28 -0400355bool
Chuck Lever16c66362021-10-12 11:57:22 -0400356nfssvc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
Christoph Hellwig026fec72017-05-08 19:01:48 +0200358 struct nfsd_renameargs *args = rqstp->rq_argp;
359
Chuck Lever62aa5572020-10-21 12:35:41 -0400360 return svcxdr_decode_diropargs(xdr, &args->ffh,
361 &args->fname, &args->flen) &&
362 svcxdr_decode_diropargs(xdr, &args->tfh,
363 &args->tname, &args->tlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364}
365
Chuck Leverc44b31c2021-10-12 11:57:28 -0400366bool
Chuck Lever16c66362021-10-12 11:57:22 -0400367nfssvc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368{
Christoph Hellwig026fec72017-05-08 19:01:48 +0200369 struct nfsd_linkargs *args = rqstp->rq_argp;
370
Chuck Lever77edcdf2020-10-21 12:34:24 -0400371 return svcxdr_decode_fhandle(xdr, &args->ffh) &&
372 svcxdr_decode_diropargs(xdr, &args->tfh,
373 &args->tname, &args->tlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374}
375
Chuck Leverc44b31c2021-10-12 11:57:28 -0400376bool
Chuck Lever16c66362021-10-12 11:57:22 -0400377nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378{
Christoph Hellwig026fec72017-05-08 19:01:48 +0200379 struct nfsd_symlinkargs *args = rqstp->rq_argp;
Chuck Lever09f75a532020-10-21 12:46:03 -0400380 struct kvec *head = rqstp->rq_arg.head;
Christoph Hellwig026fec72017-05-08 19:01:48 +0200381
Chuck Lever09f75a532020-10-21 12:46:03 -0400382 if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
Chuck Leverc44b31c2021-10-12 11:57:28 -0400383 return false;
Chuck Lever09f75a532020-10-21 12:46:03 -0400384 if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400385 return false;
Chuck Lever38a70312018-03-27 10:54:21 -0400386 if (args->tlen == 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400387 return false;
Chuck Lever38a70312018-03-27 10:54:21 -0400388
Chuck Lever09f75a532020-10-21 12:46:03 -0400389 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
390 args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
391 if (!args->first.iov_base)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400392 return false;
Chuck Lever09f75a532020-10-21 12:46:03 -0400393 return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394}
395
Chuck Leverc44b31c2021-10-12 11:57:28 -0400396bool
Chuck Lever16c66362021-10-12 11:57:22 -0400397nfssvc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398{
Christoph Hellwig026fec72017-05-08 19:01:48 +0200399 struct nfsd_readdirargs *args = rqstp->rq_argp;
400
Chuck Lever86883612020-10-19 14:15:51 -0400401 if (!svcxdr_decode_fhandle(xdr, &args->fh))
Chuck Leverc44b31c2021-10-12 11:57:28 -0400402 return false;
Chuck Lever86883612020-10-19 14:15:51 -0400403 if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400404 return false;
Chuck Lever86883612020-10-19 14:15:51 -0400405 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
Chuck Leverc44b31c2021-10-12 11:57:28 -0400406 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Chuck Leverc44b31c2021-10-12 11:57:28 -0400408 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409}
410
411/*
412 * XDR encode functions
413 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Chuck Lever130e2052021-10-13 10:41:13 -0400415bool
Chuck Leverfda49442021-10-13 10:41:06 -0400416nfssvc_encode_statres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Chuck Levercc028a12020-10-02 15:52:44 -0400417{
418 struct nfsd_stat *resp = rqstp->rq_resp;
419
Chuck Levera887eae2020-10-23 11:08:02 -0400420 return svcxdr_encode_stat(xdr, resp->status);
Chuck Levercc028a12020-10-02 15:52:44 -0400421}
422
Chuck Lever130e2052021-10-13 10:41:13 -0400423bool
Chuck Leverfda49442021-10-13 10:41:06 -0400424nfssvc_encode_attrstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425{
Christoph Hellwig63f8de32017-05-08 19:42:02 +0200426 struct nfsd_attrstat *resp = rqstp->rq_resp;
427
Chuck Lever92b54a42020-10-23 15:28:59 -0400428 if (!svcxdr_encode_stat(xdr, resp->status))
Chuck Lever130e2052021-10-13 10:41:13 -0400429 return false;
Chuck Lever92b54a42020-10-23 15:28:59 -0400430 switch (resp->status) {
431 case nfs_ok:
432 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
Chuck Lever130e2052021-10-13 10:41:13 -0400433 return false;
Chuck Lever92b54a42020-10-23 15:28:59 -0400434 break;
435 }
436
Chuck Lever130e2052021-10-13 10:41:13 -0400437 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438}
439
Chuck Lever130e2052021-10-13 10:41:13 -0400440bool
Chuck Leverfda49442021-10-13 10:41:06 -0400441nfssvc_encode_diropres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
Christoph Hellwig63f8de32017-05-08 19:42:02 +0200443 struct nfsd_diropres *resp = rqstp->rq_resp;
444
Chuck Levere3b4ef22020-10-23 16:44:16 -0400445 if (!svcxdr_encode_stat(xdr, resp->status))
Chuck Lever130e2052021-10-13 10:41:13 -0400446 return false;
Chuck Levere3b4ef22020-10-23 16:44:16 -0400447 switch (resp->status) {
448 case nfs_ok:
449 if (!svcxdr_encode_fhandle(xdr, &resp->fh))
Chuck Lever130e2052021-10-13 10:41:13 -0400450 return false;
Chuck Levere3b4ef22020-10-23 16:44:16 -0400451 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
Chuck Lever130e2052021-10-13 10:41:13 -0400452 return false;
Chuck Levere3b4ef22020-10-23 16:44:16 -0400453 break;
454 }
455
Chuck Lever130e2052021-10-13 10:41:13 -0400456 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457}
458
Chuck Lever130e2052021-10-13 10:41:13 -0400459bool
Chuck Leverfda49442021-10-13 10:41:06 -0400460nfssvc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461{
Christoph Hellwig63f8de32017-05-08 19:42:02 +0200462 struct nfsd_readlinkres *resp = rqstp->rq_resp;
Chuck Lever76e54922020-11-05 10:24:19 -0500463 struct kvec *head = rqstp->rq_res.head;
Christoph Hellwig63f8de32017-05-08 19:42:02 +0200464
Chuck Leverd9014b02020-10-23 15:41:09 -0400465 if (!svcxdr_encode_stat(xdr, resp->status))
Chuck Lever130e2052021-10-13 10:41:13 -0400466 return false;
Chuck Leverd9014b02020-10-23 15:41:09 -0400467 switch (resp->status) {
468 case nfs_ok:
469 if (xdr_stream_encode_u32(xdr, resp->len) < 0)
Chuck Lever130e2052021-10-13 10:41:13 -0400470 return false;
Chuck Leverd9014b02020-10-23 15:41:09 -0400471 xdr_write_pages(xdr, &resp->page, 0, resp->len);
472 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
Chuck Lever130e2052021-10-13 10:41:13 -0400473 return false;
Chuck Leverd9014b02020-10-23 15:41:09 -0400474 break;
475 }
476
Chuck Lever130e2052021-10-13 10:41:13 -0400477 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478}
479
Chuck Lever130e2052021-10-13 10:41:13 -0400480bool
Chuck Leverfda49442021-10-13 10:41:06 -0400481nfssvc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482{
Christoph Hellwig63f8de32017-05-08 19:42:02 +0200483 struct nfsd_readres *resp = rqstp->rq_resp;
Chuck Lever76e54922020-11-05 10:24:19 -0500484 struct kvec *head = rqstp->rq_res.head;
Christoph Hellwig63f8de32017-05-08 19:42:02 +0200485
Chuck Levera6f8d9d2020-10-23 16:40:11 -0400486 if (!svcxdr_encode_stat(xdr, resp->status))
Chuck Lever130e2052021-10-13 10:41:13 -0400487 return false;
Chuck Levera6f8d9d2020-10-23 16:40:11 -0400488 switch (resp->status) {
489 case nfs_ok:
490 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
Chuck Lever130e2052021-10-13 10:41:13 -0400491 return false;
Chuck Levera6f8d9d2020-10-23 16:40:11 -0400492 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
Chuck Lever130e2052021-10-13 10:41:13 -0400493 return false;
Chuck Levera6f8d9d2020-10-23 16:40:11 -0400494 xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
495 resp->count);
496 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
Chuck Lever130e2052021-10-13 10:41:13 -0400497 return false;
Chuck Levera6f8d9d2020-10-23 16:40:11 -0400498 break;
499 }
500
Chuck Lever130e2052021-10-13 10:41:13 -0400501 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
503
Chuck Lever130e2052021-10-13 10:41:13 -0400504bool
Chuck Leverfda49442021-10-13 10:41:06 -0400505nfssvc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506{
Christoph Hellwig63f8de32017-05-08 19:42:02 +0200507 struct nfsd_readdirres *resp = rqstp->rq_resp;
Chuck Leverf5dcccd2020-11-14 13:45:35 -0500508 struct xdr_buf *dirlist = &resp->dirlist;
Christoph Hellwig63f8de32017-05-08 19:42:02 +0200509
Chuck Lever94c8f8c2020-10-23 16:49:01 -0400510 if (!svcxdr_encode_stat(xdr, resp->status))
Chuck Lever130e2052021-10-13 10:41:13 -0400511 return false;
Chuck Lever94c8f8c2020-10-23 16:49:01 -0400512 switch (resp->status) {
513 case nfs_ok:
Chuck Leverf5dcccd2020-11-14 13:45:35 -0500514 xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
Chuck Lever94c8f8c2020-10-23 16:49:01 -0400515 /* no more entries */
516 if (xdr_stream_encode_item_absent(xdr) < 0)
Chuck Lever130e2052021-10-13 10:41:13 -0400517 return false;
Chuck Lever94c8f8c2020-10-23 16:49:01 -0400518 if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
Chuck Lever130e2052021-10-13 10:41:13 -0400519 return false;
Chuck Lever94c8f8c2020-10-23 16:49:01 -0400520 break;
521 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
Chuck Lever130e2052021-10-13 10:41:13 -0400523 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524}
525
Chuck Lever130e2052021-10-13 10:41:13 -0400526bool
Chuck Leverfda49442021-10-13 10:41:06 -0400527nfssvc_encode_statfsres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
Christoph Hellwig63f8de32017-05-08 19:42:02 +0200529 struct nfsd_statfsres *resp = rqstp->rq_resp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 struct kstatfs *stat = &resp->stats;
Chuck Leverfda49442021-10-13 10:41:06 -0400531 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Chuck Leverbf152292020-10-23 19:01:38 -0400533 if (!svcxdr_encode_stat(xdr, resp->status))
Chuck Lever130e2052021-10-13 10:41:13 -0400534 return false;
Chuck Leverbf152292020-10-23 19:01:38 -0400535 switch (resp->status) {
536 case nfs_ok:
537 p = xdr_reserve_space(xdr, XDR_UNIT * 5);
538 if (!p)
Chuck Lever130e2052021-10-13 10:41:13 -0400539 return false;
Chuck Leverbf152292020-10-23 19:01:38 -0400540 *p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2);
541 *p++ = cpu_to_be32(stat->f_bsize);
542 *p++ = cpu_to_be32(stat->f_blocks);
543 *p++ = cpu_to_be32(stat->f_bfree);
544 *p = cpu_to_be32(stat->f_bavail);
545 break;
546 }
Chuck Leverf0af2212020-10-01 18:59:49 -0400547
Chuck Lever130e2052021-10-13 10:41:13 -0400548 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549}
550
Chuck Leverd52532002020-11-13 16:53:17 -0500551/**
552 * nfssvc_encode_nfscookie - Encode a directory offset cookie
553 * @resp: readdir result context
554 * @offset: offset cookie to encode
555 *
Chuck Leverf5dcccd2020-11-14 13:45:35 -0500556 * The buffer space for the offset cookie has already been reserved
557 * by svcxdr_encode_entry_common().
Chuck Leverd52532002020-11-13 16:53:17 -0500558 */
559void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset)
560{
Chuck Leverf5dcccd2020-11-14 13:45:35 -0500561 __be32 cookie = cpu_to_be32(offset);
562
563 if (!resp->cookie_offset)
Chuck Leverd52532002020-11-13 16:53:17 -0500564 return;
565
Chuck Leverf5dcccd2020-11-14 13:45:35 -0500566 write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
567 sizeof(cookie));
568 resp->cookie_offset = 0;
569}
570
571static bool
572svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name,
573 int namlen, loff_t offset, u64 ino)
574{
575 struct xdr_buf *dirlist = &resp->dirlist;
576 struct xdr_stream *xdr = &resp->xdr;
577
578 if (xdr_stream_encode_item_present(xdr) < 0)
579 return false;
580 /* fileid */
581 if (xdr_stream_encode_u32(xdr, (u32)ino) < 0)
582 return false;
583 /* name */
584 if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0)
585 return false;
586 /* cookie */
587 resp->cookie_offset = dirlist->len;
588 if (xdr_stream_encode_u32(xdr, ~0U) < 0)
589 return false;
590
591 return true;
592}
593
594/**
Chuck Lever8a2cf9f2020-11-15 14:30:13 -0500595 * nfssvc_encode_entry - encode one NFSv2 READDIR entry
Chuck Leverf5dcccd2020-11-14 13:45:35 -0500596 * @data: directory context
597 * @name: name of the object to be encoded
598 * @namlen: length of that name, in bytes
599 * @offset: the offset of the previous entry
600 * @ino: the fileid of this entry
601 * @d_type: unused
602 *
603 * Return values:
604 * %0: Entry was successfully encoded.
605 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
606 *
607 * On exit, the following fields are updated:
608 * - resp->xdr
609 * - resp->common.err
610 * - resp->cookie_offset
611 */
Chuck Lever8a2cf9f2020-11-15 14:30:13 -0500612int nfssvc_encode_entry(void *data, const char *name, int namlen,
613 loff_t offset, u64 ino, unsigned int d_type)
Chuck Leverf5dcccd2020-11-14 13:45:35 -0500614{
615 struct readdir_cd *ccd = data;
616 struct nfsd_readdirres *resp = container_of(ccd,
617 struct nfsd_readdirres,
618 common);
619 unsigned int starting_length = resp->dirlist.len;
620
621 /* The offset cookie for the previous entry */
622 nfssvc_encode_nfscookie(resp, offset);
623
624 if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino))
625 goto out_toosmall;
626
627 xdr_commit_encode(&resp->xdr);
628 resp->common.err = nfs_ok;
629 return 0;
630
631out_toosmall:
632 resp->cookie_offset = 0;
633 resp->common.err = nfserr_toosmall;
634 resp->dirlist.len = starting_length;
635 return -EINVAL;
Chuck Leverd52532002020-11-13 16:53:17 -0500636}
637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638/*
639 * XDR release functions
640 */
Chuck Lever1841b9b2020-10-01 18:59:44 -0400641void nfssvc_release_attrstat(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642{
Chuck Lever1841b9b2020-10-01 18:59:44 -0400643 struct nfsd_attrstat *resp = rqstp->rq_resp;
644
645 fh_put(&resp->fh);
646}
647
648void nfssvc_release_diropres(struct svc_rqst *rqstp)
649{
650 struct nfsd_diropres *resp = rqstp->rq_resp;
651
652 fh_put(&resp->fh);
653}
654
655void nfssvc_release_readres(struct svc_rqst *rqstp)
656{
657 struct nfsd_readres *resp = rqstp->rq_resp;
Christoph Hellwig85374882017-05-08 18:48:24 +0200658
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 fh_put(&resp->fh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660}