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         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