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