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 <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         struct posix_acl *acl;
  33         struct inode *inode;
  34         svc_fh *fh;
  35         __be32 nfserr = 0;
  36
  37         fh = fh_copy(&resp->fh, &argp->fh);
  38         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  39         if (nfserr)
  40                 RETURN_STATUS(nfserr);
  41
  42         inode = fh->fh_dentry->d_inode;
  43
  44         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
  45                 RETURN_STATUS(nfserr_inval);
  46         resp->mask = argp->mask;
  47
  48         if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  49                 acl = get_acl(inode, ACL_TYPE_ACCESS);
  50                 if (IS_ERR(acl)) {
  51                         nfserr = nfserrno(PTR_ERR(acl));
  52                         goto fail;
  53                 }
  54                 if (acl == NULL) {
  55                         /* Solaris returns the inode's minimum ACL. */
  56                         acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  57                 }
  58                 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! */
  63                 acl = get_acl(inode, ACL_TYPE_DEFAULT);
  64                 if (IS_ERR(acl)) {
  65                         nfserr = nfserrno(PTR_ERR(acl));
  66                         goto fail;
  67                 }
  68                 resp->acl_default = acl;
  69         }
  70
  71         /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
  72         RETURN_STATUS(0);
  73
  74 fail:
  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  */
  83 static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
  84                 struct nfsd3_setaclargs *argp,
  85                 struct nfsd3_attrstat *resp)
  86 {
  87         struct inode *inode;
  88         svc_fh *fh;
  89         __be32 nfserr = 0;
  90         int error;
  91
  92         fh = fh_copy(&resp->fh, &argp->fh);
  93         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
  94         if (nfserr)
  95                 goto out;
  96
  97         inode = fh->fh_dentry->d_inode;
  98         if (!IS_POSIXACL(inode) || !inode->i_op->set_acl) {
  99                 error = -EOPNOTSUPP;
 100                 goto out_errno;
 101         }
 102
 103         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
 113 out_drop_write:
 114         fh_drop_write(fh);
 115 out_errno:
 116         nfserr = nfserrno(error);
 117 out:
 118         /* 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  */
 128 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
 129                 struct nfsd3_getaclargs *args)
 130 {
 131         p = nfs3svc_decode_fh(p, &args->fh);
 132         if (!p)
 133                 return 0;
 134         args->mask = ntohl(*p); p++;
 135
 136         return xdr_argsize_check(rqstp, p);
 137 }
 138
 139
 140 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
 141                 struct nfsd3_setaclargs *args)
 142 {
 143         struct kvec *head = rqstp->rq_arg.head;
 144         unsigned int base;
 145         int n;
 146
 147         p = nfs3svc_decode_fh(p, &args->fh);
 148         if (!p)
 149                 return 0;
 150         args->mask = ntohl(*p++);
 151         if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
 152             !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 */
 171 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 172                 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);
 177         if (resp->status == 0 && dentry && dentry->d_inode) {
 178                 struct inode *inode = dentry->d_inode;
 179                 struct kvec *head = rqstp->rq_res.head;
 180                 unsigned int base;
 181                 int n;
 182                 int w;
 183
 184                 *p++ = htonl(resp->mask);
 185                 if (!xdr_ressize_check(rqstp, p))
 186                         return 0;
 187                 base = (char *)p - (char *)head->iov_base;
 188
 189                 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);
 192                 while (w > 0) {
 193                         if (!*(rqstp->rq_next_page++))
 194                                 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 */
 216 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
 217                 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  */
 227 static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
 228                 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
 240 struct 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
 259 static 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
 265 struct 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,
 271                 .vs_hidden      = 0,
 272 };
 273