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nfs3acl.c
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1 /*
2  * Process version 3 NFSACL requests.
3  *
4  * Copyright (C) 2002-2003 Andreas Gruenbacher <[email protected]>
5  */
6 
7 #include "nfsd.h"
8 /* FIXME: nfsacl.h is a broken header */
9 #include <linux/nfsacl.h>
10 #include <linux/gfp.h>
11 #include "cache.h"
12 #include "xdr3.h"
13 #include "vfs.h"
14 
15 #define RETURN_STATUS(st) { resp->status = (st); return (st); }
16 
17 /*
18  * NULL call.
19  */
20 static __be32
21 nfsd3_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  */
29 static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
30  struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
31 {
32  svc_fh *fh;
33  struct posix_acl *acl;
34  __be32 nfserr = 0;
35 
36  fh = fh_copy(&resp->fh, &argp->fh);
37  nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
38  if (nfserr)
39  RETURN_STATUS(nfserr);
40 
41  if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
42  RETURN_STATUS(nfserr_inval);
43  resp->mask = argp->mask;
44 
45  if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
46  acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
47  if (IS_ERR(acl)) {
48  int err = PTR_ERR(acl);
49 
50  if (err == -ENODATA || err == -EOPNOTSUPP)
51  acl = NULL;
52  else {
53  nfserr = nfserrno(err);
54  goto fail;
55  }
56  }
57  if (acl == NULL) {
58  /* Solaris returns the inode's minimum ACL. */
59 
60  struct inode *inode = fh->fh_dentry->d_inode;
61  acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
62  }
63  resp->acl_access = acl;
64  }
65  if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
66  /* Check how Solaris handles requests for the Default ACL
67  of a non-directory! */
68 
69  acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
70  if (IS_ERR(acl)) {
71  int err = PTR_ERR(acl);
72 
73  if (err == -ENODATA || err == -EOPNOTSUPP)
74  acl = NULL;
75  else {
76  nfserr = nfserrno(err);
77  goto fail;
78  }
79  }
80  resp->acl_default = acl;
81  }
82 
83  /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
84  RETURN_STATUS(0);
85 
86 fail:
87  posix_acl_release(resp->acl_access);
88  posix_acl_release(resp->acl_default);
89  RETURN_STATUS(nfserr);
90 }
91 
92 /*
93  * Set the Access and/or Default ACL of a file.
94  */
95 static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
96  struct nfsd3_setaclargs *argp,
97  struct nfsd3_attrstat *resp)
98 {
99  svc_fh *fh;
100  __be32 nfserr = 0;
101 
102  fh = fh_copy(&resp->fh, &argp->fh);
103  nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
104 
105  if (!nfserr) {
106  nfserr = nfserrno( nfsd_set_posix_acl(
107  fh, ACL_TYPE_ACCESS, argp->acl_access) );
108  }
109  if (!nfserr) {
110  nfserr = nfserrno( nfsd_set_posix_acl(
111  fh, ACL_TYPE_DEFAULT, argp->acl_default) );
112  }
113 
114  /* argp->acl_{access,default} may have been allocated in
115  nfs3svc_decode_setaclargs. */
116  posix_acl_release(argp->acl_access);
117  posix_acl_release(argp->acl_default);
118  RETURN_STATUS(nfserr);
119 }
120 
121 /*
122  * XDR decode functions
123  */
124 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
125  struct nfsd3_getaclargs *args)
126 {
127  if (!(p = nfs3svc_decode_fh(p, &args->fh)))
128  return 0;
129  args->mask = ntohl(*p); p++;
130 
131  return xdr_argsize_check(rqstp, p);
132 }
133 
134 
135 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
136  struct nfsd3_setaclargs *args)
137 {
138  struct kvec *head = rqstp->rq_arg.head;
139  unsigned int base;
140  int n;
141 
142  if (!(p = nfs3svc_decode_fh(p, &args->fh)))
143  return 0;
144  args->mask = ntohl(*p++);
145  if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
146  !xdr_argsize_check(rqstp, p))
147  return 0;
148 
149  base = (char *)p - (char *)head->iov_base;
150  n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
151  (args->mask & NFS_ACL) ?
152  &args->acl_access : NULL);
153  if (n > 0)
154  n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
155  (args->mask & NFS_DFACL) ?
156  &args->acl_default : NULL);
157  return (n > 0);
158 }
159 
160 /*
161  * XDR encode functions
162  */
163 
164 /* GETACL */
165 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
166  struct nfsd3_getaclres *resp)
167 {
168  struct dentry *dentry = resp->fh.fh_dentry;
169 
170  p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
171  if (resp->status == 0 && dentry && dentry->d_inode) {
172  struct inode *inode = dentry->d_inode;
173  struct kvec *head = rqstp->rq_res.head;
174  unsigned int base;
175  int n;
176  int w;
177 
178  *p++ = htonl(resp->mask);
179  if (!xdr_ressize_check(rqstp, p))
180  return 0;
181  base = (char *)p - (char *)head->iov_base;
182 
183  rqstp->rq_res.page_len = w = nfsacl_size(
184  (resp->mask & NFS_ACL) ? resp->acl_access : NULL,
185  (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
186  while (w > 0) {
187  if (!rqstp->rq_respages[rqstp->rq_resused++])
188  return 0;
189  w -= PAGE_SIZE;
190  }
191 
192  n = nfsacl_encode(&rqstp->rq_res, base, inode,
193  resp->acl_access,
194  resp->mask & NFS_ACL, 0);
195  if (n > 0)
196  n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
197  resp->acl_default,
198  resp->mask & NFS_DFACL,
199  NFS_ACL_DEFAULT);
200  if (n <= 0)
201  return 0;
202  } else
203  if (!xdr_ressize_check(rqstp, p))
204  return 0;
205 
206  return 1;
207 }
208 
209 /* SETACL */
210 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
211  struct nfsd3_attrstat *resp)
212 {
213  p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
214 
215  return xdr_ressize_check(rqstp, p);
216 }
217 
218 /*
219  * XDR release functions
220  */
221 static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
222  struct nfsd3_getaclres *resp)
223 {
224  fh_put(&resp->fh);
225  posix_acl_release(resp->acl_access);
226  posix_acl_release(resp->acl_default);
227  return 1;
228 }
229 
230 #define nfs3svc_decode_voidargs NULL
231 #define nfs3svc_release_void NULL
232 #define nfsd3_setaclres nfsd3_attrstat
233 #define nfsd3_voidres nfsd3_voidargs
234 struct nfsd3_voidargs { int dummy; };
235 
236 #define PROC(name, argt, rest, relt, cache, respsize) \
237  { (svc_procfunc) nfsd3_proc_##name, \
238  (kxdrproc_t) nfs3svc_decode_##argt##args, \
239  (kxdrproc_t) nfs3svc_encode_##rest##res, \
240  (kxdrproc_t) nfs3svc_release_##relt, \
241  sizeof(struct nfsd3_##argt##args), \
242  sizeof(struct nfsd3_##rest##res), \
243  0, \
244  cache, \
245  respsize, \
246  }
247 
248 #define ST 1 /* status*/
249 #define AT 21 /* attributes */
250 #define pAT (1+AT) /* post attributes - conditional */
251 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
252 
253 static struct svc_procedure nfsd_acl_procedures3[] = {
254  PROC(null, void, void, void, RC_NOCACHE, ST),
255  PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
256  PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
257 };
258 
259 struct svc_version nfsd_acl_version3 = {
260  .vs_vers = 3,
261  .vs_nproc = 3,
262  .vs_proc = nfsd_acl_procedures3,
263  .vs_dispatch = nfsd_dispatch,
264  .vs_xdrsize = NFS3_SVC_XDRSIZE,
265  .vs_hidden = 0,
266 };
267 
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