Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_export.c
Version:
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1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD: releng/5.3/sys/kern/vfs_export.c 136588 2004-10-16 08:43:07Z cvs2svn $"); 39 40 #include <sys/param.h> 41 #include <sys/dirent.h> 42 #include <sys/domain.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/mount.h> 48 #include <sys/mutex.h> 49 #include <sys/socket.h> 50 #include <sys/systm.h> 51 #include <sys/vnode.h> 52 53 #include <net/radix.h> 54 55 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure"); 56 57 static void vfs_free_addrlist(struct netexport *nep); 58 static int vfs_free_netcred(struct radix_node *rn, void *w); 59 static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 60 struct export_args *argp); 61 62 /* 63 * Network address lookup element 64 */ 65 struct netcred { 66 struct radix_node netc_rnodes[2]; 67 int netc_exflags; 68 struct ucred netc_anon; 69 }; 70 71 /* 72 * Network export information 73 */ 74 struct netexport { 75 struct netcred ne_defexported; /* Default export */ 76 struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */ 77 }; 78 79 /* 80 * Build hash lists of net addresses and hang them off the mount point. 81 * Called by ufs_mount() to set up the lists of export addresses. 82 */ 83 static int 84 vfs_hang_addrlist(mp, nep, argp) 85 struct mount *mp; 86 struct netexport *nep; 87 struct export_args *argp; 88 { 89 register struct netcred *np; 90 register struct radix_node_head *rnh; 91 register int i; 92 struct radix_node *rn; 93 struct sockaddr *saddr, *smask = 0; 94 struct domain *dom; 95 int error; 96 97 /* 98 * XXX: This routine converts from a `struct xucred' 99 * (argp->ex_anon) to a `struct ucred' (np->netc_anon). This 100 * operation is questionable; for example, what should be done 101 * with fields like cr_uidinfo and cr_prison? Currently, this 102 * routine does not touch them (leaves them as NULL). 103 */ 104 if (argp->ex_anon.cr_version != XUCRED_VERSION) 105 return (EINVAL); 106 107 if (argp->ex_addrlen == 0) { 108 if (mp->mnt_flag & MNT_DEFEXPORTED) 109 return (EPERM); 110 np = &nep->ne_defexported; 111 np->netc_exflags = argp->ex_flags; 112 bzero(&np->netc_anon, sizeof(np->netc_anon)); 113 np->netc_anon.cr_uid = argp->ex_anon.cr_uid; 114 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups; 115 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups, 116 sizeof(np->netc_anon.cr_groups)); 117 np->netc_anon.cr_ref = 1; 118 mp->mnt_flag |= MNT_DEFEXPORTED; 119 return (0); 120 } 121 122 #if MSIZE <= 256 123 if (argp->ex_addrlen > MLEN) 124 return (EINVAL); 125 #endif 126 127 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 128 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO); 129 saddr = (struct sockaddr *) (np + 1); 130 if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen))) 131 goto out; 132 if (saddr->sa_len > argp->ex_addrlen) 133 saddr->sa_len = argp->ex_addrlen; 134 if (argp->ex_masklen) { 135 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 136 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 137 if (error) 138 goto out; 139 if (smask->sa_len > argp->ex_masklen) 140 smask->sa_len = argp->ex_masklen; 141 } 142 i = saddr->sa_family; 143 if ((rnh = nep->ne_rtable[i]) == NULL) { 144 /* 145 * Seems silly to initialize every AF when most are not used, 146 * do so on demand here 147 */ 148 for (dom = domains; dom; dom = dom->dom_next) 149 if (dom->dom_family == i && dom->dom_rtattach) { 150 dom->dom_rtattach((void **) &nep->ne_rtable[i], 151 dom->dom_rtoffset); 152 break; 153 } 154 if ((rnh = nep->ne_rtable[i]) == NULL) { 155 error = ENOBUFS; 156 goto out; 157 } 158 } 159 RADIX_NODE_HEAD_LOCK(rnh); 160 rn = (*rnh->rnh_addaddr)(saddr, smask, rnh, np->netc_rnodes); 161 RADIX_NODE_HEAD_UNLOCK(rnh); 162 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */ 163 error = EPERM; 164 goto out; 165 } 166 np->netc_exflags = argp->ex_flags; 167 bzero(&np->netc_anon, sizeof(np->netc_anon)); 168 np->netc_anon.cr_uid = argp->ex_anon.cr_uid; 169 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups; 170 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups, 171 sizeof(np->netc_anon.cr_groups)); 172 np->netc_anon.cr_ref = 1; 173 return (0); 174 out: 175 free(np, M_NETADDR); 176 return (error); 177 } 178 179 /* Helper for vfs_free_addrlist. */ 180 /* ARGSUSED */ 181 static int 182 vfs_free_netcred(rn, w) 183 struct radix_node *rn; 184 void *w; 185 { 186 register struct radix_node_head *rnh = (struct radix_node_head *) w; 187 188 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh); 189 free(rn, M_NETADDR); 190 return (0); 191 } 192 193 /* 194 * Free the net address hash lists that are hanging off the mount points. 195 */ 196 static void 197 vfs_free_addrlist(nep) 198 struct netexport *nep; 199 { 200 register int i; 201 register struct radix_node_head *rnh; 202 203 for (i = 0; i <= AF_MAX; i++) 204 if ((rnh = nep->ne_rtable[i])) { 205 RADIX_NODE_HEAD_LOCK(rnh); 206 (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh); 207 RADIX_NODE_HEAD_DESTROY(rnh); 208 free(rnh, M_RTABLE); 209 nep->ne_rtable[i] = NULL; /* not SMP safe XXX */ 210 } 211 } 212 213 /* 214 * High level function to manipulate export options on a mount point 215 * and the passed in netexport. 216 * Struct export_args *argp is the variable used to twiddle options, 217 * the structure is described in sys/mount.h 218 */ 219 int 220 vfs_export(mp, argp) 221 struct mount *mp; 222 struct export_args *argp; 223 { 224 struct netexport *nep; 225 int error; 226 227 nep = mp->mnt_export; 228 if (argp->ex_flags & MNT_DELEXPORT) { 229 if (nep == NULL) 230 return (ENOENT); 231 if (mp->mnt_flag & MNT_EXPUBLIC) { 232 vfs_setpublicfs(NULL, NULL, NULL); 233 mp->mnt_flag &= ~MNT_EXPUBLIC; 234 } 235 vfs_free_addrlist(nep); 236 mp->mnt_export = NULL; 237 free(nep, M_MOUNT); 238 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 239 } 240 if (argp->ex_flags & MNT_EXPORTED) { 241 if (nep == NULL) { 242 nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO); 243 mp->mnt_export = nep; 244 } 245 if (argp->ex_flags & MNT_EXPUBLIC) { 246 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) 247 return (error); 248 mp->mnt_flag |= MNT_EXPUBLIC; 249 } 250 if ((error = vfs_hang_addrlist(mp, nep, argp))) 251 return (error); 252 mp->mnt_flag |= MNT_EXPORTED; 253 } 254 return (0); 255 } 256 257 /* 258 * Set the publicly exported filesystem (WebNFS). Currently, only 259 * one public filesystem is possible in the spec (RFC 2054 and 2055) 260 */ 261 int 262 vfs_setpublicfs(mp, nep, argp) 263 struct mount *mp; 264 struct netexport *nep; 265 struct export_args *argp; 266 { 267 int error; 268 struct vnode *rvp; 269 char *cp; 270 271 /* 272 * mp == NULL -> invalidate the current info, the FS is 273 * no longer exported. May be called from either vfs_export 274 * or unmount, so check if it hasn't already been done. 275 */ 276 if (mp == NULL) { 277 if (nfs_pub.np_valid) { 278 nfs_pub.np_valid = 0; 279 if (nfs_pub.np_index != NULL) { 280 FREE(nfs_pub.np_index, M_TEMP); 281 nfs_pub.np_index = NULL; 282 } 283 } 284 return (0); 285 } 286 287 /* 288 * Only one allowed at a time. 289 */ 290 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 291 return (EBUSY); 292 293 /* 294 * Get real filehandle for root of exported FS. 295 */ 296 bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle)); 297 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid; 298 299 if ((error = VFS_ROOT(mp, &rvp, curthread /* XXX */))) 300 return (error); 301 302 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) 303 return (error); 304 305 vput(rvp); 306 307 /* 308 * If an indexfile was specified, pull it in. 309 */ 310 if (argp->ex_indexfile != NULL) { 311 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, 312 M_WAITOK); 313 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 314 MAXNAMLEN, (size_t *)0); 315 if (!error) { 316 /* 317 * Check for illegal filenames. 318 */ 319 for (cp = nfs_pub.np_index; *cp; cp++) { 320 if (*cp == '/') { 321 error = EINVAL; 322 break; 323 } 324 } 325 } 326 if (error) { 327 FREE(nfs_pub.np_index, M_TEMP); 328 return (error); 329 } 330 } 331 332 nfs_pub.np_mount = mp; 333 nfs_pub.np_valid = 1; 334 return (0); 335 } 336 337 /* 338 * Used by the filesystems to determine if a given network address 339 * (passed in 'nam') is present in thier exports list, returns a pointer 340 * to struct netcred so that the filesystem can examine it for 341 * access rights (read/write/etc). 342 */ 343 struct netcred * 344 vfs_export_lookup(mp, nam) 345 register struct mount *mp; 346 struct sockaddr *nam; 347 { 348 struct netexport *nep; 349 register struct netcred *np; 350 register struct radix_node_head *rnh; 351 struct sockaddr *saddr; 352 353 nep = mp->mnt_export; 354 if (nep == NULL) 355 return (NULL); 356 np = NULL; 357 if (mp->mnt_flag & MNT_EXPORTED) { 358 /* 359 * Lookup in the export list first. 360 */ 361 if (nam != NULL) { 362 saddr = nam; 363 rnh = nep->ne_rtable[saddr->sa_family]; 364 if (rnh != NULL) { 365 RADIX_NODE_HEAD_LOCK(rnh); 366 np = (struct netcred *) 367 (*rnh->rnh_matchaddr)(saddr, rnh); 368 RADIX_NODE_HEAD_UNLOCK(rnh); 369 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 370 np = NULL; 371 } 372 } 373 /* 374 * If no address match, use the default if it exists. 375 */ 376 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 377 np = &nep->ne_defexported; 378 } 379 return (np); 380 } 381 382 /* 383 * XXX: This comment comes from the deprecated ufs_check_export() 384 * XXX: and may not entirely apply, but lacking something better: 385 * This is the generic part of fhtovp called after the underlying 386 * filesystem has validated the file handle. 387 * 388 * Verify that a host should have access to a filesystem. 389 */ 390 391 int 392 vfs_stdcheckexp(mp, nam, extflagsp, credanonp) 393 struct mount *mp; 394 struct sockaddr *nam; 395 int *extflagsp; 396 struct ucred **credanonp; 397 { 398 struct netcred *np; 399 400 np = vfs_export_lookup(mp, nam); 401 if (np == NULL) 402 return (EACCES); 403 *extflagsp = np->netc_exflags; 404 *credanonp = &np->netc_anon; 405 return (0); 406 } 407
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