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