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 */ 21 static __be32 22 nfsacld_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 */ 30 static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp, 31 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp) 32 { 33 struct posix_acl *acl; 34 struct inode *inode; 35 svc_fh *fh; 36 __be32 nfserr = 0; 37 38 dprintk("nfsd: GETACL(2acl) %s\n", SVCFH_fmt(&argp->fh)); 39 40 fh = fh_copy(&resp->fh, &argp->fh); 41 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); 42 if (nfserr) 43 RETURN_STATUS(nfserr); 44 45 inode = fh->fh_dentry->d_inode; 46 47 if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT)) 48 RETURN_STATUS(nfserr_inval); 49 resp->mask = argp->mask; 50 51 nfserr = fh_getattr(fh, &resp->stat); 52 if (nfserr) 53 goto fail; 54 55 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { 56 acl = get_acl(inode, ACL_TYPE_ACCESS); 57 if (IS_ERR(acl)) { 58 nfserr = nfserrno(PTR_ERR(acl)); 59 goto fail; 60 } 61 if (acl == NULL) { 62 /* Solaris returns the inode's minimum ACL. */ 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 acl = get_acl(inode, ACL_TYPE_DEFAULT); 71 if (IS_ERR(acl)) { 72 nfserr = nfserrno(PTR_ERR(acl)); 73 goto fail; 74 } 75 resp->acl_default = acl; 76 } 77 78 /* resp->acl_{access,default} are released in nfssvc_release_getacl. */ 79 RETURN_STATUS(0); 80 81 fail: 82 posix_acl_release(resp->acl_access); 83 posix_acl_release(resp->acl_default); 84 RETURN_STATUS(nfserr); 85 } 86 87 /* 88 * Set the Access and/or Default ACL of a file. 89 */ 90 static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp, 91 struct nfsd3_setaclargs *argp, 92 struct nfsd_attrstat *resp) 93 { 94 struct inode *inode; 95 svc_fh *fh; 96 __be32 nfserr = 0; 97 int error; 98 99 dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh)); 100 101 fh = fh_copy(&resp->fh, &argp->fh); 102 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); 103 if (nfserr) 104 goto out; 105 106 inode = fh->fh_dentry->d_inode; 107 if (!IS_POSIXACL(inode) || !inode->i_op->set_acl) { 108 error = -EOPNOTSUPP; 109 goto out_errno; 110 } 111 112 error = fh_want_write(fh); 113 if (error) 114 goto out_errno; 115 116 error = inode->i_op->set_acl(inode, argp->acl_access, ACL_TYPE_ACCESS); 117 if (error) 118 goto out_drop_write; 119 error = inode->i_op->set_acl(inode, argp->acl_default, 120 ACL_TYPE_DEFAULT); 121 if (error) 122 goto out_drop_write; 123 124 fh_drop_write(fh); 125 126 nfserr = fh_getattr(fh, &resp->stat); 127 128 out: 129 /* argp->acl_{access,default} may have been allocated in 130 nfssvc_decode_setaclargs. */ 131 posix_acl_release(argp->acl_access); 132 posix_acl_release(argp->acl_default); 133 return nfserr; 134 out_drop_write: 135 fh_drop_write(fh); 136 out_errno: 137 nfserr = nfserrno(error); 138 goto out; 139 } 140 141 /* 142 * Check file attributes 143 */ 144 static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp, 145 struct nfsd_fhandle *argp, struct nfsd_attrstat *resp) 146 { 147 __be32 nfserr; 148 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh)); 149 150 fh_copy(&resp->fh, &argp->fh); 151 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); 152 if (nfserr) 153 return nfserr; 154 nfserr = fh_getattr(&resp->fh, &resp->stat); 155 return nfserr; 156 } 157 158 /* 159 * Check file access 160 */ 161 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp, 162 struct nfsd3_accessres *resp) 163 { 164 __be32 nfserr; 165 166 dprintk("nfsd: ACCESS(2acl) %s 0x%x\n", 167 SVCFH_fmt(&argp->fh), 168 argp->access); 169 170 fh_copy(&resp->fh, &argp->fh); 171 resp->access = argp->access; 172 nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL); 173 if (nfserr) 174 return nfserr; 175 nfserr = fh_getattr(&resp->fh, &resp->stat); 176 return nfserr; 177 } 178 179 /* 180 * XDR decode functions 181 */ 182 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p, 183 struct nfsd3_getaclargs *argp) 184 { 185 if (!(p = nfs2svc_decode_fh(p, &argp->fh))) 186 return 0; 187 argp->mask = ntohl(*p); p++; 188 189 return xdr_argsize_check(rqstp, p); 190 } 191 192 193 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p, 194 struct nfsd3_setaclargs *argp) 195 { 196 struct kvec *head = rqstp->rq_arg.head; 197 unsigned int base; 198 int n; 199 200 if (!(p = nfs2svc_decode_fh(p, &argp->fh))) 201 return 0; 202 argp->mask = ntohl(*p++); 203 if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) || 204 !xdr_argsize_check(rqstp, p)) 205 return 0; 206 207 base = (char *)p - (char *)head->iov_base; 208 n = nfsacl_decode(&rqstp->rq_arg, base, NULL, 209 (argp->mask & NFS_ACL) ? 210 &argp->acl_access : NULL); 211 if (n > 0) 212 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, 213 (argp->mask & NFS_DFACL) ? 214 &argp->acl_default : NULL); 215 return (n > 0); 216 } 217 218 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p, 219 struct nfsd_fhandle *argp) 220 { 221 if (!(p = nfs2svc_decode_fh(p, &argp->fh))) 222 return 0; 223 return xdr_argsize_check(rqstp, p); 224 } 225 226 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p, 227 struct nfsd3_accessargs *argp) 228 { 229 if (!(p = nfs2svc_decode_fh(p, &argp->fh))) 230 return 0; 231 argp->access = ntohl(*p++); 232 233 return xdr_argsize_check(rqstp, p); 234 } 235 236 /* 237 * XDR encode functions 238 */ 239 240 /* 241 * There must be an encoding function for void results so svc_process 242 * will work properly. 243 */ 244 static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) 245 { 246 return xdr_ressize_check(rqstp, p); 247 } 248 249 /* GETACL */ 250 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p, 251 struct nfsd3_getaclres *resp) 252 { 253 struct dentry *dentry = resp->fh.fh_dentry; 254 struct inode *inode; 255 struct kvec *head = rqstp->rq_res.head; 256 unsigned int base; 257 int n; 258 int w; 259 260 /* 261 * Since this is version 2, the check for nfserr in 262 * nfsd_dispatch actually ensures the following cannot happen. 263 * However, it seems fragile to depend on that. 264 */ 265 if (dentry == NULL || dentry->d_inode == NULL) 266 return 0; 267 inode = dentry->d_inode; 268 269 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 270 *p++ = htonl(resp->mask); 271 if (!xdr_ressize_check(rqstp, p)) 272 return 0; 273 base = (char *)p - (char *)head->iov_base; 274 275 rqstp->rq_res.page_len = w = nfsacl_size( 276 (resp->mask & NFS_ACL) ? resp->acl_access : NULL, 277 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); 278 while (w > 0) { 279 if (!*(rqstp->rq_next_page++)) 280 return 0; 281 w -= PAGE_SIZE; 282 } 283 284 n = nfsacl_encode(&rqstp->rq_res, base, inode, 285 resp->acl_access, 286 resp->mask & NFS_ACL, 0); 287 if (n > 0) 288 n = nfsacl_encode(&rqstp->rq_res, base + n, inode, 289 resp->acl_default, 290 resp->mask & NFS_DFACL, 291 NFS_ACL_DEFAULT); 292 if (n <= 0) 293 return 0; 294 return 1; 295 } 296 297 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p, 298 struct nfsd_attrstat *resp) 299 { 300 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 301 return xdr_ressize_check(rqstp, p); 302 } 303 304 /* ACCESS */ 305 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p, 306 struct nfsd3_accessres *resp) 307 { 308 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 309 *p++ = htonl(resp->access); 310 return xdr_ressize_check(rqstp, p); 311 } 312 313 /* 314 * XDR release functions 315 */ 316 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p, 317 struct nfsd3_getaclres *resp) 318 { 319 fh_put(&resp->fh); 320 posix_acl_release(resp->acl_access); 321 posix_acl_release(resp->acl_default); 322 return 1; 323 } 324 325 static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p, 326 struct nfsd_attrstat *resp) 327 { 328 fh_put(&resp->fh); 329 return 1; 330 } 331 332 static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p, 333 struct nfsd3_accessres *resp) 334 { 335 fh_put(&resp->fh); 336 return 1; 337 } 338 339 #define nfsaclsvc_decode_voidargs NULL 340 #define nfsaclsvc_release_void NULL 341 #define nfsd3_fhandleargs nfsd_fhandle 342 #define nfsd3_attrstatres nfsd_attrstat 343 #define nfsd3_voidres nfsd3_voidargs 344 struct nfsd3_voidargs { int dummy; }; 345 346 #define PROC(name, argt, rest, relt, cache, respsize) \ 347 { (svc_procfunc) nfsacld_proc_##name, \ 348 (kxdrproc_t) nfsaclsvc_decode_##argt##args, \ 349 (kxdrproc_t) nfsaclsvc_encode_##rest##res, \ 350 (kxdrproc_t) nfsaclsvc_release_##relt, \ 351 sizeof(struct nfsd3_##argt##args), \ 352 sizeof(struct nfsd3_##rest##res), \ 353 0, \ 354 cache, \ 355 respsize, \ 356 } 357 358 #define ST 1 /* status*/ 359 #define AT 21 /* attributes */ 360 #define pAT (1+AT) /* post attributes - conditional */ 361 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 362 363 static struct svc_procedure nfsd_acl_procedures2[] = { 364 PROC(null, void, void, void, RC_NOCACHE, ST), 365 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)), 366 PROC(setacl, setacl, attrstat, attrstat, RC_NOCACHE, ST+AT), 367 PROC(getattr, fhandle, attrstat, attrstat, RC_NOCACHE, ST+AT), 368 PROC(access, access, access, access, RC_NOCACHE, ST+AT+1), 369 }; 370 371 struct svc_version nfsd_acl_version2 = { 372 .vs_vers = 2, 373 .vs_nproc = 5, 374 .vs_proc = nfsd_acl_procedures2, 375 .vs_dispatch = nfsd_dispatch, 376 .vs_xdrsize = NFS3_SVC_XDRSIZE, 377 .vs_hidden = 0, 378 }; 379