fs/nfsd/nfs3acl.c

   1 /*
   2  * linux/fs/nfsd/nfs3acl.c
   3  *
   4  * Process version 3 NFSACL requests.
   5  *
   6  * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
   7  */
   8
   9 #include <linux/sunrpc/svc.h>
  10 #include <linux/nfs3.h>
  11 #include <linux/nfsd/nfsd.h>
  12 #include <linux/nfsd/cache.h>
  13 #include <linux/nfsd/xdr3.h>
  14 #include <linux/posix_acl.h>
  15 #include <linux/nfsacl.h>
  16
  17 #define RETURN_STATUS(st)       { resp->status = (st); return (st); }
  18
  19 /*
  20  * NULL call.
  21  */
  22 static __be32
  23 nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  24 {
  25         return nfs_ok;
  26 }
  27
  28 /*
  29  * Get the Access and/or Default ACL of a file.
  30  */
  31 static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
  32                 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
  33 {
  34         svc_fh *fh;
  35         struct posix_acl *acl;
  36         __be32 nfserr = 0;
  37
  38         fh = fh_copy(&resp->fh, &argp->fh);
  39         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  40         if (nfserr)
  41                 RETURN_STATUS(nfserr);
  42
  43         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
  44                 RETURN_STATUS(nfserr_inval);
  45         resp->mask = argp->mask;
  46
  47         if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  48                 acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
  49                 if (IS_ERR(acl)) {
  50                         int err = PTR_ERR(acl);
  51
  52                         if (err == -ENODATA || err == -EOPNOTSUPP)
  53                                 acl = NULL;
  54                         else {
  55                                 nfserr = nfserrno(err);
  56                                 goto fail;
  57                         }
  58                 }
  59                 if (acl == NULL) {
  60                         /* Solaris returns the inode's minimum ACL. */
  61
  62                         struct inode *inode = fh->fh_dentry->d_inode;
  63                         acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  64                 }
  65                 resp->acl_access = acl;
  66         }
  67         if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
  68                 /* Check how Solaris handles requests for the Default ACL
  69                    of a non-directory! */
  70
  71                 acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
  72                 if (IS_ERR(acl)) {
  73                         int err = PTR_ERR(acl);
  74
  75                         if (err == -ENODATA || err == -EOPNOTSUPP)
  76                                 acl = NULL;
  77                         else {
  78                                 nfserr = nfserrno(err);
  79                                 goto fail;
  80                         }
  81                 }
  82                 resp->acl_default = acl;
  83         }
  84
  85         /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
  86         RETURN_STATUS(0);
  87
  88 fail:
  89         posix_acl_release(resp->acl_access);
  90         posix_acl_release(resp->acl_default);
  91         RETURN_STATUS(nfserr);
  92 }
  93
  94 /*
  95  * Set the Access and/or Default ACL of a file.
  96  */
  97 static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
  98                 struct nfsd3_setaclargs *argp,
  99                 struct nfsd3_attrstat *resp)
 100 {
 101         svc_fh *fh;
 102         __be32 nfserr = 0;
 103
 104         fh = fh_copy(&resp->fh, &argp->fh);
 105         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
 106
 107         if (!nfserr) {
 108                 nfserr = nfserrno( nfsd_set_posix_acl(
 109                         fh, ACL_TYPE_ACCESS, argp->acl_access) );
 110         }
 111         if (!nfserr) {
 112                 nfserr = nfserrno( nfsd_set_posix_acl(
 113                         fh, ACL_TYPE_DEFAULT, argp->acl_default) );
 114         }
 115
 116         /* argp->acl_{access,default} may have been allocated in
 117            nfs3svc_decode_setaclargs. */
 118         posix_acl_release(argp->acl_access);
 119         posix_acl_release(argp->acl_default);
 120         RETURN_STATUS(nfserr);
 121 }
 122
 123 /*
 124  * XDR decode functions
 125  */
 126 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
 127                 struct nfsd3_getaclargs *args)
 128 {
 129         if (!(p = nfs3svc_decode_fh(p, &args->fh)))
 130                 return 0;
 131         args->mask = ntohl(*p); p++;
 132
 133         return xdr_argsize_check(rqstp, p);
 134 }
 135
 136
 137 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
 138                 struct nfsd3_setaclargs *args)
 139 {
 140         struct kvec *head = rqstp->rq_arg.head;
 141         unsigned int base;
 142         int n;
 143
 144         if (!(p = nfs3svc_decode_fh(p, &args->fh)))
 145                 return 0;
 146         args->mask = ntohl(*p++);
 147         if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
 148             !xdr_argsize_check(rqstp, p))
 149                 return 0;
 150
 151         base = (char *)p - (char *)head->iov_base;
 152         n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
 153                           (args->mask & NFS_ACL) ?
 154                           &args->acl_access : NULL);
 155         if (n > 0)
 156                 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
 157                                   (args->mask & NFS_DFACL) ?
 158                                   &args->acl_default : NULL);
 159         return (n > 0);
 160 }
 161
 162 /*
 163  * XDR encode functions
 164  */
 165
 166 /* GETACL */
 167 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 168                 struct nfsd3_getaclres *resp)
 169 {
 170         struct dentry *dentry = resp->fh.fh_dentry;
 171
 172         p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
 173         if (resp->status == 0 && dentry && dentry->d_inode) {
 174                 struct inode *inode = dentry->d_inode;
 175                 struct kvec *head = rqstp->rq_res.head;
 176                 unsigned int base;
 177                 int n;
 178                 int w;
 179
 180                 *p++ = htonl(resp->mask);
 181                 if (!xdr_ressize_check(rqstp, p))
 182                         return 0;
 183                 base = (char *)p - (char *)head->iov_base;
 184
 185                 rqstp->rq_res.page_len = w = nfsacl_size(
 186                         (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 187                         (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 188                 while (w > 0) {
 189                         if (!rqstp->rq_respages[rqstp->rq_resused++])
 190                                 return 0;
 191                         w -= PAGE_SIZE;
 192                 }
 193
 194                 n = nfsacl_encode(&rqstp->rq_res, base, inode,
 195                                   resp->acl_access,
 196                                   resp->mask & NFS_ACL, 0);
 197                 if (n > 0)
 198                         n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 199                                           resp->acl_default,
 200                                           resp->mask & NFS_DFACL,
 201                                           NFS_ACL_DEFAULT);
 202                 if (n <= 0)
 203                         return 0;
 204         } else
 205                 if (!xdr_ressize_check(rqstp, p))
 206                         return 0;
 207
 208         return 1;
 209 }
 210
 211 /* SETACL */
 212 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
 213                 struct nfsd3_attrstat *resp)
 214 {
 215         p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
 216
 217         return xdr_ressize_check(rqstp, p);
 218 }
 219
 220 /*
 221  * XDR release functions
 222  */
 223 static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
 224                 struct nfsd3_getaclres *resp)
 225 {
 226         fh_put(&resp->fh);
 227         posix_acl_release(resp->acl_access);
 228         posix_acl_release(resp->acl_default);
 229         return 1;
 230 }
 231
 232 #define nfs3svc_decode_voidargs         NULL
 233 #define nfs3svc_release_void            NULL
 234 #define nfsd3_setaclres                 nfsd3_attrstat
 235 #define nfsd3_voidres                   nfsd3_voidargs
 236 struct nfsd3_voidargs { int dummy; };
 237
 238 #define PROC(name, argt, rest, relt, cache, respsize)   \
 239  { (svc_procfunc) nfsd3_proc_##name,            \
 240    (kxdrproc_t) nfs3svc_decode_##argt##args,    \
 241    (kxdrproc_t) nfs3svc_encode_##rest##res,     \
 242    (kxdrproc_t) nfs3svc_release_##relt,         \
 243    sizeof(struct nfsd3_##argt##args),           \
 244    sizeof(struct nfsd3_##rest##res),            \
 245    0,                                           \
 246    cache,                                       \
 247    respsize,                                    \
 248  }
 249
 250 #define ST 1            /* status*/
 251 #define AT 21           /* attributes */
 252 #define pAT (1+AT)      /* post attributes - conditional */
 253 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 254
 255 static struct svc_procedure             nfsd_acl_procedures3[] = {
 256   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 257   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 258   PROC(setacl,  setacl,         setacl,         fhandle,  RC_NOCACHE, ST+pAT),
 259 };
 260
 261 struct svc_version      nfsd_acl_version3 = {
 262                 .vs_vers        = 3,
 263                 .vs_nproc       = 3,
 264                 .vs_proc        = nfsd_acl_procedures3,
 265                 .vs_dispatch    = nfsd_dispatch,
 266                 .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 267                 .vs_hidden      = 1,
 268 };
 269