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Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001/*
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00002 * Process version 3 NFSACL requests.
3 *
4 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
5 */
6
Boaz Harrosh9a74af22009-12-03 20:30:56 +02007#include "nfsd.h"
8/* FIXME: nfsacl.h is a broken header */
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00009#include <linux/nfsacl.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090010#include <linux/gfp.h>
Boaz Harrosh9a74af22009-12-03 20:30:56 +020011#include "cache.h"
12#include "xdr3.h"
J. Bruce Fields0a3adad2009-11-04 18:12:35 -050013#include "vfs.h"
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000014
15#define RETURN_STATUS(st) { resp->status = (st); return (st); }
16
17/*
18 * NULL call.
19 */
Al Viro7111c662006-10-19 23:28:45 -070020static __be32
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000021nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
22{
23 return nfs_ok;
24}
25
26/*
27 * Get the Access and/or Default ACL of a file.
28 */
Al Viro7111c662006-10-19 23:28:45 -070029static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000030 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
31{
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000032 struct posix_acl *acl;
Christoph Hellwig4ac72492013-12-20 05:16:55 -080033 struct inode *inode;
34 svc_fh *fh;
Al Viroc4d987b2006-10-19 23:29:00 -070035 __be32 nfserr = 0;
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000036
37 fh = fh_copy(&resp->fh, &argp->fh);
Miklos Szeredi8837abc2008-06-16 13:20:29 +020038 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
39 if (nfserr)
J. Bruce Fieldsac8587d2007-11-12 16:05:02 -050040 RETURN_STATUS(nfserr);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000041
David Howells2b0143b2015-03-17 22:25:59 +000042 inode = d_inode(fh->fh_dentry);
Christoph Hellwig4ac72492013-12-20 05:16:55 -080043
Kinglong Mee7b8f4582015-07-03 19:39:02 +080044 if (argp->mask & ~NFS_ACL_MASK)
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000045 RETURN_STATUS(nfserr_inval);
46 resp->mask = argp->mask;
47
48 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
Christoph Hellwig4ac72492013-12-20 05:16:55 -080049 acl = get_acl(inode, ACL_TYPE_ACCESS);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000050 if (acl == NULL) {
51 /* Solaris returns the inode's minimum ACL. */
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000052 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
53 }
Kinglong Mee35e634b2014-07-09 21:54:16 +080054 if (IS_ERR(acl)) {
55 nfserr = nfserrno(PTR_ERR(acl));
56 goto fail;
57 }
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000058 resp->acl_access = acl;
59 }
60 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
61 /* Check how Solaris handles requests for the Default ACL
62 of a non-directory! */
Christoph Hellwig4ac72492013-12-20 05:16:55 -080063 acl = get_acl(inode, ACL_TYPE_DEFAULT);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000064 if (IS_ERR(acl)) {
Christoph Hellwig4ac72492013-12-20 05:16:55 -080065 nfserr = nfserrno(PTR_ERR(acl));
66 goto fail;
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000067 }
68 resp->acl_default = acl;
69 }
70
71 /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
72 RETURN_STATUS(0);
73
74fail:
75 posix_acl_release(resp->acl_access);
76 posix_acl_release(resp->acl_default);
77 RETURN_STATUS(nfserr);
78}
79
80/*
81 * Set the Access and/or Default ACL of a file.
82 */
Al Viro7111c662006-10-19 23:28:45 -070083static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000084 struct nfsd3_setaclargs *argp,
85 struct nfsd3_attrstat *resp)
86{
Christoph Hellwig4ac72492013-12-20 05:16:55 -080087 struct inode *inode;
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000088 svc_fh *fh;
Al Viroc4d987b2006-10-19 23:29:00 -070089 __be32 nfserr = 0;
Christoph Hellwig4ac72492013-12-20 05:16:55 -080090 int error;
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000091
92 fh = fh_copy(&resp->fh, &argp->fh);
Miklos Szeredi8837abc2008-06-16 13:20:29 +020093 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
Christoph Hellwig4ac72492013-12-20 05:16:55 -080094 if (nfserr)
95 goto out;
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000096
David Howells2b0143b2015-03-17 22:25:59 +000097 inode = d_inode(fh->fh_dentry);
Christoph Hellwig4ac72492013-12-20 05:16:55 -080098 if (!IS_POSIXACL(inode) || !inode->i_op->set_acl) {
99 error = -EOPNOTSUPP;
100 goto out_errno;
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000101 }
102
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800103 error = fh_want_write(fh);
104 if (error)
105 goto out_errno;
106
107 error = inode->i_op->set_acl(inode, argp->acl_access, ACL_TYPE_ACCESS);
108 if (error)
109 goto out_drop_write;
110 error = inode->i_op->set_acl(inode, argp->acl_default,
111 ACL_TYPE_DEFAULT);
112
113out_drop_write:
114 fh_drop_write(fh);
115out_errno:
116 nfserr = nfserrno(error);
117out:
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000118 /* argp->acl_{access,default} may have been allocated in
119 nfs3svc_decode_setaclargs. */
120 posix_acl_release(argp->acl_access);
121 posix_acl_release(argp->acl_default);
122 RETURN_STATUS(nfserr);
123}
124
125/*
126 * XDR decode functions
127 */
Al Viro91f07162006-10-19 23:28:57 -0700128static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000129 struct nfsd3_getaclargs *args)
130{
Benoit Tained40aa332014-05-22 16:32:30 +0200131 p = nfs3svc_decode_fh(p, &args->fh);
132 if (!p)
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000133 return 0;
134 args->mask = ntohl(*p); p++;
135
136 return xdr_argsize_check(rqstp, p);
137}
138
139
Al Viro91f07162006-10-19 23:28:57 -0700140static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000141 struct nfsd3_setaclargs *args)
142{
143 struct kvec *head = rqstp->rq_arg.head;
144 unsigned int base;
145 int n;
146
Benoit Tained40aa332014-05-22 16:32:30 +0200147 p = nfs3svc_decode_fh(p, &args->fh);
148 if (!p)
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000149 return 0;
150 args->mask = ntohl(*p++);
Kinglong Mee7b8f4582015-07-03 19:39:02 +0800151 if (args->mask & ~NFS_ACL_MASK ||
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000152 !xdr_argsize_check(rqstp, p))
153 return 0;
154
155 base = (char *)p - (char *)head->iov_base;
156 n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
157 (args->mask & NFS_ACL) ?
158 &args->acl_access : NULL);
159 if (n > 0)
160 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
161 (args->mask & NFS_DFACL) ?
162 &args->acl_default : NULL);
163 return (n > 0);
164}
165
166/*
167 * XDR encode functions
168 */
169
170/* GETACL */
Al Viro91f07162006-10-19 23:28:57 -0700171static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000172 struct nfsd3_getaclres *resp)
173{
174 struct dentry *dentry = resp->fh.fh_dentry;
175
176 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
David Howells2b0143b2015-03-17 22:25:59 +0000177 if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
178 struct inode *inode = d_inode(dentry);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000179 struct kvec *head = rqstp->rq_res.head;
180 unsigned int base;
181 int n;
Jesper Juhl14d2b592006-12-08 02:39:40 -0800182 int w;
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000183
184 *p++ = htonl(resp->mask);
185 if (!xdr_ressize_check(rqstp, p))
186 return 0;
187 base = (char *)p - (char *)head->iov_base;
188
Jesper Juhl14d2b592006-12-08 02:39:40 -0800189 rqstp->rq_res.page_len = w = nfsacl_size(
190 (resp->mask & NFS_ACL) ? resp->acl_access : NULL,
191 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000192 while (w > 0) {
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500193 if (!*(rqstp->rq_next_page++))
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000194 return 0;
195 w -= PAGE_SIZE;
196 }
197
198 n = nfsacl_encode(&rqstp->rq_res, base, inode,
199 resp->acl_access,
200 resp->mask & NFS_ACL, 0);
201 if (n > 0)
202 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
203 resp->acl_default,
204 resp->mask & NFS_DFACL,
205 NFS_ACL_DEFAULT);
206 if (n <= 0)
207 return 0;
208 } else
209 if (!xdr_ressize_check(rqstp, p))
210 return 0;
211
212 return 1;
213}
214
215/* SETACL */
Al Viro91f07162006-10-19 23:28:57 -0700216static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000217 struct nfsd3_attrstat *resp)
218{
219 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
220
221 return xdr_ressize_check(rqstp, p);
222}
223
224/*
225 * XDR release functions
226 */
Al Viro91f07162006-10-19 23:28:57 -0700227static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000228 struct nfsd3_getaclres *resp)
229{
230 fh_put(&resp->fh);
231 posix_acl_release(resp->acl_access);
232 posix_acl_release(resp->acl_default);
233 return 1;
234}
235
236#define nfs3svc_decode_voidargs NULL
237#define nfs3svc_release_void NULL
238#define nfsd3_setaclres nfsd3_attrstat
239#define nfsd3_voidres nfsd3_voidargs
240struct nfsd3_voidargs { int dummy; };
241
242#define PROC(name, argt, rest, relt, cache, respsize) \
243 { (svc_procfunc) nfsd3_proc_##name, \
244 (kxdrproc_t) nfs3svc_decode_##argt##args, \
245 (kxdrproc_t) nfs3svc_encode_##rest##res, \
246 (kxdrproc_t) nfs3svc_release_##relt, \
247 sizeof(struct nfsd3_##argt##args), \
248 sizeof(struct nfsd3_##rest##res), \
249 0, \
250 cache, \
251 respsize, \
252 }
253
254#define ST 1 /* status*/
255#define AT 21 /* attributes */
256#define pAT (1+AT) /* post attributes - conditional */
257#define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
258
259static struct svc_procedure nfsd_acl_procedures3[] = {
260 PROC(null, void, void, void, RC_NOCACHE, ST),
261 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
262 PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
263};
264
265struct svc_version nfsd_acl_version3 = {
266 .vs_vers = 3,
267 .vs_nproc = 3,
268 .vs_proc = nfsd_acl_procedures3,
269 .vs_dispatch = nfsd_dispatch,
270 .vs_xdrsize = NFS3_SVC_XDRSIZE,
Peter Staubach1b7e0402009-11-02 16:59:07 -0500271 .vs_hidden = 0,
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000272};
273