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
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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 * 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 * $FreeBSD: releng/5.0/sys/kern/vfs_export.c 99111 2002-06-30 05:23:58Z alfred $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/socket.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/mount.h> 49 #include <net/radix.h> 50 #include <sys/domain.h> 51 #include <sys/dirent.h> 52 #include <sys/vnode.h> 53 54 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure"); 55 56 static void vfs_free_addrlist(struct netexport *nep); 57 static int vfs_free_netcred(struct radix_node *rn, void *w); 58 static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 59 struct export_args *argp); 60 61 /* 62 * Network address lookup element 63 */ 64 struct netcred { 65 struct radix_node netc_rnodes[2]; 66 int netc_exflags; 67 struct ucred netc_anon; 68 }; 69 70 /* 71 * Network export information 72 */ 73 struct netexport { 74 struct netcred ne_defexported; /* Default export */ 75 struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */ 76 }; 77 78 /* 79 * Build hash lists of net addresses and hang them off the mount point. 80 * Called by ufs_mount() to set up the lists of export addresses. 81 */ 82 static int 83 vfs_hang_addrlist(mp, nep, argp) 84 struct mount *mp; 85 struct netexport *nep; 86 struct export_args *argp; 87 { 88 register struct netcred *np; 89 register struct radix_node_head *rnh; 90 register int i; 91 struct radix_node *rn; 92 struct sockaddr *saddr, *smask = 0; 93 struct domain *dom; 94 int error; 95 96 /* 97 * XXX: This routine converts from a `struct xucred' 98 * (argp->ex_anon) to a `struct ucred' (np->netc_anon). This 99 * operation is questionable; for example, what should be done 100 * with fields like cr_uidinfo and cr_prison? Currently, this 101 * routine does not touch them (leaves them as NULL). 102 */ 103 if (argp->ex_anon.cr_version != XUCRED_VERSION) 104 return (EINVAL); 105 106 if (argp->ex_addrlen == 0) { 107 if (mp->mnt_flag & MNT_DEFEXPORTED) 108 return (EPERM); 109 np = &nep->ne_defexported; 110 np->netc_exflags = argp->ex_flags; 111 bzero(&np->netc_anon, sizeof(np->netc_anon)); 112 np->netc_anon.cr_uid = argp->ex_anon.cr_uid; 113 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups; 114 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups, 115 sizeof(np->netc_anon.cr_groups)); 116 np->netc_anon.cr_ref = 1; 117 mp->mnt_flag |= MNT_DEFEXPORTED; 118 return (0); 119 } 120 121 if (argp->ex_addrlen > MLEN) 122 return (EINVAL); 123 124 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 125 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO); 126 saddr = (struct sockaddr *) (np + 1); 127 if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen))) 128 goto out; 129 if (saddr->sa_len > argp->ex_addrlen) 130 saddr->sa_len = argp->ex_addrlen; 131 if (argp->ex_masklen) { 132 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 133 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 134 if (error) 135 goto out; 136 if (smask->sa_len > argp->ex_masklen) 137 smask->sa_len = argp->ex_masklen; 138 } 139 i = saddr->sa_family; 140 if ((rnh = nep->ne_rtable[i]) == 0) { 141 /* 142 * Seems silly to initialize every AF when most are not used, 143 * do so on demand here 144 */ 145 for (dom = domains; dom; dom = dom->dom_next) 146 if (dom->dom_family == i && dom->dom_rtattach) { 147 dom->dom_rtattach((void **) &nep->ne_rtable[i], 148 dom->dom_rtoffset); 149 break; 150 } 151 if ((rnh = nep->ne_rtable[i]) == 0) { 152 error = ENOBUFS; 153 goto out; 154 } 155 } 156 rn = (*rnh->rnh_addaddr)(saddr, smask, rnh, np->netc_rnodes); 157 if (rn == 0 || np != (struct netcred *)rn) { /* already exists */ 158 error = EPERM; 159 goto out; 160 } 161 np->netc_exflags = argp->ex_flags; 162 bzero(&np->netc_anon, sizeof(np->netc_anon)); 163 np->netc_anon.cr_uid = argp->ex_anon.cr_uid; 164 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups; 165 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups, 166 sizeof(np->netc_anon.cr_groups)); 167 np->netc_anon.cr_ref = 1; 168 return (0); 169 out: 170 free(np, M_NETADDR); 171 return (error); 172 } 173 174 /* Helper for vfs_free_addrlist. */ 175 /* ARGSUSED */ 176 static int 177 vfs_free_netcred(rn, w) 178 struct radix_node *rn; 179 void *w; 180 { 181 register struct radix_node_head *rnh = (struct radix_node_head *) w; 182 183 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh); 184 free(rn, M_NETADDR); 185 return (0); 186 } 187 188 /* 189 * Free the net address hash lists that are hanging off the mount points. 190 */ 191 static void 192 vfs_free_addrlist(nep) 193 struct netexport *nep; 194 { 195 register int i; 196 register struct radix_node_head *rnh; 197 198 for (i = 0; i <= AF_MAX; i++) 199 if ((rnh = nep->ne_rtable[i])) { 200 (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh); 201 free(rnh, M_RTABLE); 202 nep->ne_rtable[i] = 0; 203 } 204 } 205 206 /* 207 * High level function to manipulate export options on a mount point 208 * and the passed in netexport. 209 * Struct export_args *argp is the variable used to twiddle options, 210 * the structure is described in sys/mount.h 211 */ 212 int 213 vfs_export(mp, argp) 214 struct mount *mp; 215 struct export_args *argp; 216 { 217 struct netexport *nep; 218 int error; 219 220 nep = mp->mnt_export; 221 if (argp->ex_flags & MNT_DELEXPORT) { 222 if (nep == NULL) 223 return (ENOENT); 224 if (mp->mnt_flag & MNT_EXPUBLIC) { 225 vfs_setpublicfs(NULL, NULL, NULL); 226 mp->mnt_flag &= ~MNT_EXPUBLIC; 227 } 228 vfs_free_addrlist(nep); 229 mp->mnt_export = NULL; 230 free(nep, M_MOUNT); 231 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 232 } 233 if (argp->ex_flags & MNT_EXPORTED) { 234 if (nep == NULL) { 235 nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO); 236 mp->mnt_export = nep; 237 } 238 if (argp->ex_flags & MNT_EXPUBLIC) { 239 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) 240 return (error); 241 mp->mnt_flag |= MNT_EXPUBLIC; 242 } 243 if ((error = vfs_hang_addrlist(mp, nep, argp))) 244 return (error); 245 mp->mnt_flag |= MNT_EXPORTED; 246 } 247 return (0); 248 } 249 250 /* 251 * Set the publicly exported filesystem (WebNFS). Currently, only 252 * one public filesystem is possible in the spec (RFC 2054 and 2055) 253 */ 254 int 255 vfs_setpublicfs(mp, nep, argp) 256 struct mount *mp; 257 struct netexport *nep; 258 struct export_args *argp; 259 { 260 int error; 261 struct vnode *rvp; 262 char *cp; 263 264 /* 265 * mp == NULL -> invalidate the current info, the FS is 266 * no longer exported. May be called from either vfs_export 267 * or unmount, so check if it hasn't already been done. 268 */ 269 if (mp == NULL) { 270 if (nfs_pub.np_valid) { 271 nfs_pub.np_valid = 0; 272 if (nfs_pub.np_index != NULL) { 273 FREE(nfs_pub.np_index, M_TEMP); 274 nfs_pub.np_index = NULL; 275 } 276 } 277 return (0); 278 } 279 280 /* 281 * Only one allowed at a time. 282 */ 283 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 284 return (EBUSY); 285 286 /* 287 * Get real filehandle for root of exported FS. 288 */ 289 bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle)); 290 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid; 291 292 if ((error = VFS_ROOT(mp, &rvp))) 293 return (error); 294 295 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) 296 return (error); 297 298 vput(rvp); 299 300 /* 301 * If an indexfile was specified, pull it in. 302 */ 303 if (argp->ex_indexfile != NULL) { 304 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, 305 M_WAITOK); 306 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 307 MAXNAMLEN, (size_t *)0); 308 if (!error) { 309 /* 310 * Check for illegal filenames. 311 */ 312 for (cp = nfs_pub.np_index; *cp; cp++) { 313 if (*cp == '/') { 314 error = EINVAL; 315 break; 316 } 317 } 318 } 319 if (error) { 320 FREE(nfs_pub.np_index, M_TEMP); 321 return (error); 322 } 323 } 324 325 nfs_pub.np_mount = mp; 326 nfs_pub.np_valid = 1; 327 return (0); 328 } 329 330 /* 331 * Used by the filesystems to determine if a given network address 332 * (passed in 'nam') is present in thier exports list, returns a pointer 333 * to struct netcred so that the filesystem can examine it for 334 * access rights (read/write/etc). 335 */ 336 struct netcred * 337 vfs_export_lookup(mp, nam) 338 register struct mount *mp; 339 struct sockaddr *nam; 340 { 341 struct netexport *nep; 342 register struct netcred *np; 343 register struct radix_node_head *rnh; 344 struct sockaddr *saddr; 345 346 nep = mp->mnt_export; 347 if (nep == NULL) 348 return (NULL); 349 np = NULL; 350 if (mp->mnt_flag & MNT_EXPORTED) { 351 /* 352 * Lookup in the export list first. 353 */ 354 if (nam != NULL) { 355 saddr = nam; 356 rnh = nep->ne_rtable[saddr->sa_family]; 357 if (rnh != NULL) { 358 np = (struct netcred *) 359 (*rnh->rnh_matchaddr)(saddr, rnh); 360 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 361 np = NULL; 362 } 363 } 364 /* 365 * If no address match, use the default if it exists. 366 */ 367 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 368 np = &nep->ne_defexported; 369 } 370 return (np); 371 } 372 373 /* 374 * XXX: This comment comes from the deprecated ufs_check_export() 375 * XXX: and may not entirely apply, but lacking something better: 376 * This is the generic part of fhtovp called after the underlying 377 * filesystem has validated the file handle. 378 * 379 * Verify that a host should have access to a filesystem. 380 */ 381 382 int 383 vfs_stdcheckexp(mp, nam, extflagsp, credanonp) 384 struct mount *mp; 385 struct sockaddr *nam; 386 int *extflagsp; 387 struct ucred **credanonp; 388 { 389 struct netcred *np; 390 391 np = vfs_export_lookup(mp, nam); 392 if (np == NULL) 393 return (EACCES); 394 *extflagsp = np->netc_exflags; 395 *credanonp = &np->netc_anon; 396 return (0); 397 } 398
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