linux/fs/nfsd/nfs2acl.c
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   1/*
   2 * Process version 2 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 NFSDDBG_FACILITY                NFSDDBG_PROC
  16#define RETURN_STATUS(st)       { resp->status = (st); return (st); }
  17
  18/*
  19 * NULL call.
  20 */
  21static __be32
  22nfsacld_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  23{
  24        return nfs_ok;
  25}
  26
  27/*
  28 * Get the Access and/or Default ACL of a file.
  29 */
  30static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp,
  31                struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
  32{
  33        svc_fh *fh;
  34        struct posix_acl *acl;
  35        __be32 nfserr = 0;
  36
  37        dprintk("nfsd: GETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
  38
  39        fh = fh_copy(&resp->fh, &argp->fh);
  40        nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  41        if (nfserr)
  42                RETURN_STATUS(nfserr);
  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        nfserr = fh_getattr(fh, &resp->stat);
  49        if (nfserr)
  50                goto fail;
  51
  52        if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  53                acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
  54                if (IS_ERR(acl)) {
  55                        int err = PTR_ERR(acl);
  56
  57                        if (err == -ENODATA || err == -EOPNOTSUPP)
  58                                acl = NULL;
  59                        else {
  60                                nfserr = nfserrno(err);
  61                                goto fail;
  62                        }
  63                }
  64                if (acl == NULL) {
  65                        /* Solaris returns the inode's minimum ACL. */
  66
  67                        struct inode *inode = fh->fh_dentry->d_inode;
  68                        acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  69                }
  70                resp->acl_access = acl;
  71        }
  72        if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
  73                /* Check how Solaris handles requests for the Default ACL
  74                   of a non-directory! */
  75
  76                acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
  77                if (IS_ERR(acl)) {
  78                        int err = PTR_ERR(acl);
  79
  80                        if (err == -ENODATA || err == -EOPNOTSUPP)
  81                                acl = NULL;
  82                        else {
  83                                nfserr = nfserrno(err);
  84                                goto fail;
  85                        }
  86                }
  87                resp->acl_default = acl;
  88        }
  89
  90        /* resp->acl_{access,default} are released in nfssvc_release_getacl. */
  91        RETURN_STATUS(0);
  92
  93fail:
  94        posix_acl_release(resp->acl_access);
  95        posix_acl_release(resp->acl_default);
  96        RETURN_STATUS(nfserr);
  97}
  98
  99/*
 100 * Set the Access and/or Default ACL of a file.
 101 */
 102static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
 103                struct nfsd3_setaclargs *argp,
 104                struct nfsd_attrstat *resp)
 105{
 106        svc_fh *fh;
 107        __be32 nfserr = 0;
 108
 109        dprintk("nfsd: SETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
 110
 111        fh = fh_copy(&resp->fh, &argp->fh);
 112        nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
 113
 114        if (!nfserr) {
 115                nfserr = nfserrno( nfsd_set_posix_acl(
 116                        fh, ACL_TYPE_ACCESS, argp->acl_access) );
 117        }
 118        if (!nfserr) {
 119                nfserr = nfserrno( nfsd_set_posix_acl(
 120                        fh, ACL_TYPE_DEFAULT, argp->acl_default) );
 121        }
 122        if (!nfserr) {
 123                nfserr = fh_getattr(fh, &resp->stat);
 124        }
 125
 126        /* argp->acl_{access,default} may have been allocated in
 127           nfssvc_decode_setaclargs. */
 128        posix_acl_release(argp->acl_access);
 129        posix_acl_release(argp->acl_default);
 130        return nfserr;
 131}
 132
 133/*
 134 * Check file attributes
 135 */
 136static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
 137                struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
 138{
 139        __be32 nfserr;
 140        dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
 141
 142        fh_copy(&resp->fh, &argp->fh);
 143        nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
 144        if (nfserr)
 145                return nfserr;
 146        nfserr = fh_getattr(&resp->fh, &resp->stat);
 147        return nfserr;
 148}
 149
 150/*
 151 * Check file access
 152 */
 153static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
 154                struct nfsd3_accessres *resp)
 155{
 156        __be32 nfserr;
 157
 158        dprintk("nfsd: ACCESS(2acl)   %s 0x%x\n",
 159                        SVCFH_fmt(&argp->fh),
 160                        argp->access);
 161
 162        fh_copy(&resp->fh, &argp->fh);
 163        resp->access = argp->access;
 164        nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 165        if (nfserr)
 166                return nfserr;
 167        nfserr = fh_getattr(&resp->fh, &resp->stat);
 168        return nfserr;
 169}
 170
 171/*
 172 * XDR decode functions
 173 */
 174static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
 175                struct nfsd3_getaclargs *argp)
 176{
 177        if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 178                return 0;
 179        argp->mask = ntohl(*p); p++;
 180
 181        return xdr_argsize_check(rqstp, p);
 182}
 183
 184
 185static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
 186                struct nfsd3_setaclargs *argp)
 187{
 188        struct kvec *head = rqstp->rq_arg.head;
 189        unsigned int base;
 190        int n;
 191
 192        if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 193                return 0;
 194        argp->mask = ntohl(*p++);
 195        if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
 196            !xdr_argsize_check(rqstp, p))
 197                return 0;
 198
 199        base = (char *)p - (char *)head->iov_base;
 200        n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
 201                          (argp->mask & NFS_ACL) ?
 202                          &argp->acl_access : NULL);
 203        if (n > 0)
 204                n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
 205                                  (argp->mask & NFS_DFACL) ?
 206                                  &argp->acl_default : NULL);
 207        return (n > 0);
 208}
 209
 210static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p,
 211                struct nfsd_fhandle *argp)
 212{
 213        if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 214                return 0;
 215        return xdr_argsize_check(rqstp, p);
 216}
 217
 218static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
 219                struct nfsd3_accessargs *argp)
 220{
 221        if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 222                return 0;
 223        argp->access = ntohl(*p++);
 224
 225        return xdr_argsize_check(rqstp, p);
 226}
 227
 228/*
 229 * XDR encode functions
 230 */
 231
 232/*
 233 * There must be an encoding function for void results so svc_process
 234 * will work properly.
 235 */
 236static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 237{
 238        return xdr_ressize_check(rqstp, p);
 239}
 240
 241/* GETACL */
 242static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 243                struct nfsd3_getaclres *resp)
 244{
 245        struct dentry *dentry = resp->fh.fh_dentry;
 246        struct inode *inode;
 247        struct kvec *head = rqstp->rq_res.head;
 248        unsigned int base;
 249        int n;
 250        int w;
 251
 252        /*
 253         * Since this is version 2, the check for nfserr in
 254         * nfsd_dispatch actually ensures the following cannot happen.
 255         * However, it seems fragile to depend on that.
 256         */
 257        if (dentry == NULL || dentry->d_inode == NULL)
 258                return 0;
 259        inode = dentry->d_inode;
 260
 261        p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 262        *p++ = htonl(resp->mask);
 263        if (!xdr_ressize_check(rqstp, p))
 264                return 0;
 265        base = (char *)p - (char *)head->iov_base;
 266
 267        rqstp->rq_res.page_len = w = nfsacl_size(
 268                (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 269                (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 270        while (w > 0) {
 271                if (!*(rqstp->rq_next_page++))
 272                        return 0;
 273                w -= PAGE_SIZE;
 274        }
 275
 276        n = nfsacl_encode(&rqstp->rq_res, base, inode,
 277                          resp->acl_access,
 278                          resp->mask & NFS_ACL, 0);
 279        if (n > 0)
 280                n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 281                                  resp->acl_default,
 282                                  resp->mask & NFS_DFACL,
 283                                  NFS_ACL_DEFAULT);
 284        if (n <= 0)
 285                return 0;
 286        return 1;
 287}
 288
 289static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
 290                struct nfsd_attrstat *resp)
 291{
 292        p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 293        return xdr_ressize_check(rqstp, p);
 294}
 295
 296/* ACCESS */
 297static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 298                struct nfsd3_accessres *resp)
 299{
 300        p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 301        *p++ = htonl(resp->access);
 302        return xdr_ressize_check(rqstp, p);
 303}
 304
 305/*
 306 * XDR release functions
 307 */
 308static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
 309                struct nfsd3_getaclres *resp)
 310{
 311        fh_put(&resp->fh);
 312        posix_acl_release(resp->acl_access);
 313        posix_acl_release(resp->acl_default);
 314        return 1;
 315}
 316
 317static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p,
 318                struct nfsd_attrstat *resp)
 319{
 320        fh_put(&resp->fh);
 321        return 1;
 322}
 323
 324static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p,
 325               struct nfsd3_accessres *resp)
 326{
 327       fh_put(&resp->fh);
 328       return 1;
 329}
 330
 331#define nfsaclsvc_decode_voidargs       NULL
 332#define nfsaclsvc_release_void          NULL
 333#define nfsd3_fhandleargs       nfsd_fhandle
 334#define nfsd3_attrstatres       nfsd_attrstat
 335#define nfsd3_voidres           nfsd3_voidargs
 336struct nfsd3_voidargs { int dummy; };
 337
 338#define PROC(name, argt, rest, relt, cache, respsize)   \
 339 { (svc_procfunc) nfsacld_proc_##name,          \
 340   (kxdrproc_t) nfsaclsvc_decode_##argt##args,  \
 341   (kxdrproc_t) nfsaclsvc_encode_##rest##res,   \
 342   (kxdrproc_t) nfsaclsvc_release_##relt,               \
 343   sizeof(struct nfsd3_##argt##args),           \
 344   sizeof(struct nfsd3_##rest##res),            \
 345   0,                                           \
 346   cache,                                       \
 347   respsize,                                    \
 348 }
 349
 350#define ST 1            /* status*/
 351#define AT 21           /* attributes */
 352#define pAT (1+AT)      /* post attributes - conditional */
 353#define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 354
 355static struct svc_procedure             nfsd_acl_procedures2[] = {
 356  PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 357  PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 358  PROC(setacl,  setacl,         attrstat,       attrstat, RC_NOCACHE, ST+AT),
 359  PROC(getattr, fhandle,        attrstat,       attrstat, RC_NOCACHE, ST+AT),
 360  PROC(access,  access,         access,         access,   RC_NOCACHE, ST+AT+1),
 361};
 362
 363struct svc_version      nfsd_acl_version2 = {
 364                .vs_vers        = 2,
 365                .vs_nproc       = 5,
 366                .vs_proc        = nfsd_acl_procedures2,
 367                .vs_dispatch    = nfsd_dispatch,
 368                .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 369                .vs_hidden      = 0,
 370};
 371
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