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)
  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 {
  31         struct nfsd3_getaclargs *argp = rqstp->rq_argp;
  32         struct nfsd3_getaclres *resp = rqstp->rq_resp;
  33         struct posix_acl *acl;
  34         struct inode *inode;
  35         svc_fh *fh;
  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         inode = d_inode(fh->fh_dentry);
  44
  45         if (argp->mask & ~NFS_ACL_MASK)
  46                 RETURN_STATUS(nfserr_inval);
  47         resp->mask = argp->mask;
  48
  49         if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  50                 acl = get_acl(inode, ACL_TYPE_ACCESS);
  51                 if (acl == NULL) {
  52                         /* Solaris returns the inode's minimum ACL. */
  53                         acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  54                 }
  55                 if (IS_ERR(acl)) {
  56                         nfserr = nfserrno(PTR_ERR(acl));
  57                         goto fail;
  58                 }
  59                 resp->acl_access = acl;
  60         }
  61         if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
  62                 /* Check how Solaris handles requests for the Default ACL
  63                    of a non-directory! */
  64                 acl = get_acl(inode, ACL_TYPE_DEFAULT);
  65                 if (IS_ERR(acl)) {
  66                         nfserr = nfserrno(PTR_ERR(acl));
  67                         goto fail;
  68                 }
  69                 resp->acl_default = acl;
  70         }
  71
  72         /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
  73         RETURN_STATUS(0);
  74
  75 fail:
  76         posix_acl_release(resp->acl_access);
  77         posix_acl_release(resp->acl_default);
  78         RETURN_STATUS(nfserr);
  79 }
  80
  81 /*
  82  * Set the Access and/or Default ACL of a file.
  83  */
  84 static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
  85 {
  86         struct nfsd3_setaclargs *argp = rqstp->rq_argp;
  87         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  88         struct inode *inode;
  89         svc_fh *fh;
  90         __be32 nfserr = 0;
  91         int error;
  92
  93         fh = fh_copy(&resp->fh, &argp->fh);
  94         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
  95         if (nfserr)
  96                 goto out;
  97
  98         inode = d_inode(fh->fh_dentry);
  99
 100         error = fh_want_write(fh);
 101         if (error)
 102                 goto out_errno;
 103
 104         fh_lock(fh);
 105
 106         error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
 107         if (error)
 108                 goto out_drop_lock;
 109         error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
 110
 111 out_drop_lock:
 112         fh_unlock(fh);
 113         fh_drop_write(fh);
 114 out_errno:
 115         nfserr = nfserrno(error);
 116 out:
 117         /* argp->acl_{access,default} may have been allocated in
 118            nfs3svc_decode_setaclargs. */
 119         posix_acl_release(argp->acl_access);
 120         posix_acl_release(argp->acl_default);
 121         RETURN_STATUS(nfserr);
 122 }
 123
 124 /*
 125  * XDR decode functions
 126  */
 127 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
 128 {
 129         struct nfsd3_getaclargs *args = rqstp->rq_argp;
 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 {
 142         struct nfsd3_setaclargs *args = rqstp->rq_argp;
 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_MASK ||
 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 {
 173         struct nfsd3_getaclres *resp = rqstp->rq_resp;
 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 && d_really_is_positive(dentry)) {
 178                 struct inode *inode = d_inode(dentry);
 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 {
 218         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 219
 220         p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
 221
 222         return xdr_ressize_check(rqstp, p);
 223 }
 224
 225 /*
 226  * XDR release functions
 227  */
 228 static void nfs3svc_release_getacl(struct svc_rqst *rqstp)
 229 {
 230         struct nfsd3_getaclres *resp = rqstp->rq_resp;
 231
 232         fh_put(&resp->fh);
 233         posix_acl_release(resp->acl_access);
 234         posix_acl_release(resp->acl_default);
 235 }
 236
 237 #define nfs3svc_decode_voidargs         NULL
 238 #define nfs3svc_release_void            NULL
 239 #define nfsd3_setaclres                 nfsd3_attrstat
 240 #define nfsd3_voidres                   nfsd3_voidargs
 241 struct nfsd3_voidargs { int dummy; };
 242
 243 #define PROC(name, argt, rest, relt, cache, respsize)                   \
 244 {                                                                       \
 245         .pc_func        = nfsd3_proc_##name,                            \
 246         .pc_decode      = nfs3svc_decode_##argt##args,                  \
 247         .pc_encode      = nfs3svc_encode_##rest##res,                   \
 248         .pc_release     = nfs3svc_release_##relt,                       \
 249         .pc_argsize     = sizeof(struct nfsd3_##argt##args),            \
 250         .pc_ressize     = sizeof(struct nfsd3_##rest##res),             \
 251         .pc_cachetype   = cache,                                        \
 252         .pc_xdrressize  = respsize,                                     \
 253 }
 254
 255 #define ST 1            /* status*/
 256 #define AT 21           /* attributes */
 257 #define pAT (1+AT)      /* post attributes - conditional */
 258 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 259
 260 static const struct svc_procedure nfsd_acl_procedures3[] = {
 261   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 262   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 263   PROC(setacl,  setacl,         setacl,         fhandle,  RC_NOCACHE, ST+pAT),
 264 };
 265
 266 static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)];
 267 const struct svc_version nfsd_acl_version3 = {
 268         .vs_vers        = 3,
 269         .vs_nproc       = 3,
 270         .vs_proc        = nfsd_acl_procedures3,
 271         .vs_count       = nfsd_acl_count3,
 272         .vs_dispatch    = nfsd_dispatch,
 273         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 274 };
 275