fs/nfsd/nfs3acl.c

   1 /*
   2  * Process version 3 NFSACL requests.
   3  *
   4  * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
   5  */
   6
   7 #include "nfsd.h"
   8 /* FIXME: nfsacl.h is a broken header */
   9 #include <linux/nfsacl.h>
  10 #include "cache.h"
  11 #include "xdr3.h"
  12 #include "vfs.h"
  13
  14 #define RETURN_STATUS(st)       { resp->status = (st); return (st); }
  15
  16 /*
  17  * NULL call.
  18  */
  19 static __be32
  20 nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  21 {
  22         return nfs_ok;
  23 }
  24
  25 /*
  26  * Get the Access and/or Default ACL of a file.
  27  */
  28 static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
  29                 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
  30 {
  31         svc_fh *fh;
  32         struct posix_acl *acl;
  33         __be32 nfserr = 0;
  34
  35         fh = fh_copy(&resp->fh, &argp->fh);
  36         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  37         if (nfserr)
  38                 RETURN_STATUS(nfserr);
  39
  40         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
  41                 RETURN_STATUS(nfserr_inval);
  42         resp->mask = argp->mask;
  43
  44         if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  45                 acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
  46                 if (IS_ERR(acl)) {
  47                         int err = PTR_ERR(acl);
  48
  49                         if (err == -ENODATA || err == -EOPNOTSUPP)
  50                                 acl = NULL;
  51                         else {
  52                                 nfserr = nfserrno(err);
  53                                 goto fail;
  54                         }
  55                 }
  56                 if (acl == NULL) {
  57                         /* Solaris returns the inode's minimum ACL. */
  58
  59                         struct inode *inode = fh->fh_dentry->d_inode;
  60                         acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  61                 }
  62                 resp->acl_access = acl;
  63         }
  64         if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
  65                 /* Check how Solaris handles requests for the Default ACL
  66                    of a non-directory! */
  67
  68                 acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
  69                 if (IS_ERR(acl)) {
  70                         int err = PTR_ERR(acl);
  71
  72                         if (err == -ENODATA || err == -EOPNOTSUPP)
  73                                 acl = NULL;
  74                         else {
  75                                 nfserr = nfserrno(err);
  76                                 goto fail;
  77                         }
  78                 }
  79                 resp->acl_default = acl;
  80         }
  81
  82         /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
  83         RETURN_STATUS(0);
  84
  85 fail:
  86         posix_acl_release(resp->acl_access);
  87         posix_acl_release(resp->acl_default);
  88         RETURN_STATUS(nfserr);
  89 }
  90
  91 /*
  92  * Set the Access and/or Default ACL of a file.
  93  */
  94 static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
  95                 struct nfsd3_setaclargs *argp,
  96                 struct nfsd3_attrstat *resp)
  97 {
  98         svc_fh *fh;
  99         __be32 nfserr = 0;
 100
 101         fh = fh_copy(&resp->fh, &argp->fh);
 102         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
 103
 104         if (!nfserr) {
 105                 nfserr = nfserrno( nfsd_set_posix_acl(
 106                         fh, ACL_TYPE_ACCESS, argp->acl_access) );
 107         }
 108         if (!nfserr) {
 109                 nfserr = nfserrno( nfsd_set_posix_acl(
 110                         fh, ACL_TYPE_DEFAULT, argp->acl_default) );
 111         }
 112
 113         /* argp->acl_{access,default} may have been allocated in
 114            nfs3svc_decode_setaclargs. */
 115         posix_acl_release(argp->acl_access);
 116         posix_acl_release(argp->acl_default);
 117         RETURN_STATUS(nfserr);
 118 }
 119
 120 /*
 121  * XDR decode functions
 122  */
 123 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
 124                 struct nfsd3_getaclargs *args)
 125 {
 126         if (!(p = nfs3svc_decode_fh(p, &args->fh)))
 127                 return 0;
 128         args->mask = ntohl(*p); p++;
 129
 130         return xdr_argsize_check(rqstp, p);
 131 }
 132
 133
 134 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
 135                 struct nfsd3_setaclargs *args)
 136 {
 137         struct kvec *head = rqstp->rq_arg.head;
 138         unsigned int base;
 139         int n;
 140
 141         if (!(p = nfs3svc_decode_fh(p, &args->fh)))
 142                 return 0;
 143         args->mask = ntohl(*p++);
 144         if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
 145             !xdr_argsize_check(rqstp, p))
 146                 return 0;
 147
 148         base = (char *)p - (char *)head->iov_base;
 149         n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
 150                           (args->mask & NFS_ACL) ?
 151                           &args->acl_access : NULL);
 152         if (n > 0)
 153                 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
 154                                   (args->mask & NFS_DFACL) ?
 155                                   &args->acl_default : NULL);
 156         return (n > 0);
 157 }
 158
 159 /*
 160  * XDR encode functions
 161  */
 162
 163 /* GETACL */
 164 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 165                 struct nfsd3_getaclres *resp)
 166 {
 167         struct dentry *dentry = resp->fh.fh_dentry;
 168
 169         p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
 170         if (resp->status == 0 && dentry && dentry->d_inode) {
 171                 struct inode *inode = dentry->d_inode;
 172                 struct kvec *head = rqstp->rq_res.head;
 173                 unsigned int base;
 174                 int n;
 175                 int w;
 176
 177                 *p++ = htonl(resp->mask);
 178                 if (!xdr_ressize_check(rqstp, p))
 179                         return 0;
 180                 base = (char *)p - (char *)head->iov_base;
 181
 182                 rqstp->rq_res.page_len = w = nfsacl_size(
 183                         (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 184                         (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 185                 while (w > 0) {
 186                         if (!rqstp->rq_respages[rqstp->rq_resused++])
 187                                 return 0;
 188                         w -= PAGE_SIZE;
 189                 }
 190
 191                 n = nfsacl_encode(&rqstp->rq_res, base, inode,
 192                                   resp->acl_access,
 193                                   resp->mask & NFS_ACL, 0);
 194                 if (n > 0)
 195                         n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 196                                           resp->acl_default,
 197                                           resp->mask & NFS_DFACL,
 198                                           NFS_ACL_DEFAULT);
 199                 if (n <= 0)
 200                         return 0;
 201         } else
 202                 if (!xdr_ressize_check(rqstp, p))
 203                         return 0;
 204
 205         return 1;
 206 }
 207
 208 /* SETACL */
 209 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
 210                 struct nfsd3_attrstat *resp)
 211 {
 212         p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
 213
 214         return xdr_ressize_check(rqstp, p);
 215 }
 216
 217 /*
 218  * XDR release functions
 219  */
 220 static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
 221                 struct nfsd3_getaclres *resp)
 222 {
 223         fh_put(&resp->fh);
 224         posix_acl_release(resp->acl_access);
 225         posix_acl_release(resp->acl_default);
 226         return 1;
 227 }
 228
 229 #define nfs3svc_decode_voidargs         NULL
 230 #define nfs3svc_release_void            NULL
 231 #define nfsd3_setaclres                 nfsd3_attrstat
 232 #define nfsd3_voidres                   nfsd3_voidargs
 233 struct nfsd3_voidargs { int dummy; };
 234
 235 #define PROC(name, argt, rest, relt, cache, respsize)   \
 236  { (svc_procfunc) nfsd3_proc_##name,            \
 237    (kxdrproc_t) nfs3svc_decode_##argt##args,    \
 238    (kxdrproc_t) nfs3svc_encode_##rest##res,     \
 239    (kxdrproc_t) nfs3svc_release_##relt,         \
 240    sizeof(struct nfsd3_##argt##args),           \
 241    sizeof(struct nfsd3_##rest##res),            \
 242    0,                                           \
 243    cache,                                       \
 244    respsize,                                    \
 245  }
 246
 247 #define ST 1            /* status*/
 248 #define AT 21           /* attributes */
 249 #define pAT (1+AT)      /* post attributes - conditional */
 250 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 251
 252 static struct svc_procedure             nfsd_acl_procedures3[] = {
 253   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 254   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 255   PROC(setacl,  setacl,         setacl,         fhandle,  RC_NOCACHE, ST+pAT),
 256 };
 257
 258 struct svc_version      nfsd_acl_version3 = {
 259                 .vs_vers        = 3,
 260                 .vs_nproc       = 3,
 261                 .vs_proc        = nfsd_acl_procedures3,
 262                 .vs_dispatch    = nfsd_dispatch,
 263                 .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 264                 .vs_hidden      = 0,
 265 };
 266