/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2011 Bayard G. Bell. All rights reserved. * Copyright (c) 2017 by Delphix. All rights reserved. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int autofs_init(int, char *); static major_t autofs_major; static minor_t autofs_minor; kmutex_t autofs_minor_lock; zone_key_t autofs_key; static mntopts_t auto_mntopts; /* * The AUTOFS system call. */ static struct sysent autofssysent = { 2, SE_32RVAL1 | SE_ARGC | SE_NOUNLOAD, autofssys }; static struct modlsys modlsys = { &mod_syscallops, "AUTOFS syscall", &autofssysent }; #ifdef _SYSCALL32_IMPL static struct modlsys modlsys32 = { &mod_syscallops32, "AUTOFS syscall (32-bit)", &autofssysent }; #endif /* _SYSCALL32_IMPL */ static vfsdef_t vfw = { VFSDEF_VERSION, "autofs", autofs_init, VSW_HASPROTO|VSW_CANRWRO|VSW_CANREMOUNT|VSW_STATS|VSW_ZMOUNT, &auto_mntopts }; /* * Module linkage information for the kernel. */ static struct modlfs modlfs = { &mod_fsops, "filesystem for autofs", &vfw }; static struct modlinkage modlinkage = { MODREV_1, &modlfs, &modlsys, #ifdef _SYSCALL32_IMPL &modlsys32, #endif NULL }; /* * This is the module initialization routine. */ int _init(void) { return (mod_install(&modlinkage)); } int _fini(void) { /* * Don't allow the autofs module to be unloaded for now. */ return (EBUSY); } int _info(struct modinfo *modinfop) { return (mod_info(&modlinkage, modinfop)); } static int autofs_fstype; /* * autofs VFS operations */ static int auto_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *); static int auto_unmount(vfs_t *, int, cred_t *); static int auto_root(vfs_t *, vnode_t **); static int auto_statvfs(vfs_t *, struct statvfs64 *); /* * Auto Mount options table */ static char *direct_cancel[] = { MNTOPT_INDIRECT, NULL }; static char *indirect_cancel[] = { MNTOPT_DIRECT, NULL }; static char *browse_cancel[] = { MNTOPT_NOBROWSE, NULL }; static char *nobrowse_cancel[] = { MNTOPT_BROWSE, NULL }; static mntopt_t mntopts[] = { /* * option name cancel options default arg flags */ { MNTOPT_DIRECT, direct_cancel, NULL, 0, NULL }, { MNTOPT_INDIRECT, indirect_cancel, NULL, 0, NULL }, { MNTOPT_IGNORE, NULL, NULL, MO_DEFAULT|MO_TAG, NULL }, { "nest", NULL, NULL, MO_TAG, NULL }, { MNTOPT_BROWSE, browse_cancel, NULL, MO_TAG, NULL }, { MNTOPT_NOBROWSE, nobrowse_cancel, NULL, MO_TAG, NULL }, { MNTOPT_RESTRICT, NULL, NULL, MO_TAG, NULL }, }; static mntopts_t auto_mntopts = { sizeof (mntopts) / sizeof (mntopt_t), mntopts }; /*ARGSUSED*/ static void autofs_zone_destructor(zoneid_t zoneid, void *arg) { struct autofs_globals *fngp = arg; vnode_t *vp; if (fngp == NULL) return; ASSERT(fngp->fng_fnnode_count == 1); ASSERT(fngp->fng_unmount_threads == 0); if (fngp->fng_autofs_daemon_dh != NULL) door_ki_rele(fngp->fng_autofs_daemon_dh); /* * vn_alloc() initialized the rootnode with a count of 1; we need to * make this 0 to placate auto_freefnnode(). */ vp = fntovn(fngp->fng_rootfnnodep); mutex_enter(&vp->v_lock); ASSERT(vp->v_count == 1); VN_RELE_LOCKED(vp); mutex_exit(&vp->v_lock); auto_freefnnode(fngp->fng_rootfnnodep); mutex_destroy(&fngp->fng_unmount_threads_lock); kmem_free(fngp, sizeof (*fngp)); } /* * rootfnnodep is allocated here. Its sole purpose is to provide * read/write locking for top level fnnodes. This object is * persistent and will not be deallocated until the zone is destroyed. * * The current zone is implied as the zone of interest, since we will be * calling zthread_create() which must be called from the correct zone. */ struct autofs_globals * autofs_zone_init(void) { char rootname[sizeof ("root_fnnode_zone_") + ZONEID_WIDTH]; struct autofs_globals *fngp; zoneid_t zoneid = getzoneid(); fngp = kmem_zalloc(sizeof (*fngp), KM_SLEEP); (void) snprintf(rootname, sizeof (rootname), "root_fnnode_zone_%d", zoneid); fngp->fng_rootfnnodep = auto_makefnnode(VNON, NULL, rootname, CRED(), fngp); /* * Don't need to hold fng_rootfnnodep as it's never really used for * anything. */ fngp->fng_fnnode_count = 1; fngp->fng_printed_not_running_msg = 0; fngp->fng_zoneid = zoneid; mutex_init(&fngp->fng_unmount_threads_lock, NULL, MUTEX_DEFAULT, NULL); fngp->fng_unmount_threads = 0; mutex_init(&fngp->fng_autofs_daemon_lock, NULL, MUTEX_DEFAULT, NULL); /* * Start the unmounter thread for this zone. */ (void) zthread_create(NULL, 0, auto_do_unmount, fngp, 0, minclsyspri); return (fngp); } int autofs_init(int fstype, char *name) { static const fs_operation_def_t auto_vfsops_template[] = { VFSNAME_MOUNT, { .vfs_mount = auto_mount }, VFSNAME_UNMOUNT, { .vfs_unmount = auto_unmount }, VFSNAME_ROOT, { .vfs_root = auto_root }, VFSNAME_STATVFS, { .vfs_statvfs = auto_statvfs }, NULL, NULL }; int error; autofs_fstype = fstype; ASSERT(autofs_fstype != 0); /* * Associate VFS ops vector with this fstype */ error = vfs_setfsops(fstype, auto_vfsops_template, NULL); if (error != 0) { cmn_err(CE_WARN, "autofs_init: bad vfs ops template"); return (error); } error = vn_make_ops(name, auto_vnodeops_template, &auto_vnodeops); if (error != 0) { (void) vfs_freevfsops_by_type(fstype); cmn_err(CE_WARN, "autofs_init: bad vnode ops template"); return (error); } mutex_init(&autofs_minor_lock, NULL, MUTEX_DEFAULT, NULL); /* * Assign unique major number for all autofs mounts */ if ((autofs_major = getudev()) == (major_t)-1) { cmn_err(CE_WARN, "autofs: autofs_init: can't get unique device number"); mutex_destroy(&autofs_minor_lock); return (1); } /* * We'd like to be able to provide a constructor here, but we can't * since it wants to zthread_create(), something it can't do in a ZSD * constructor. */ zone_key_create(&autofs_key, NULL, NULL, autofs_zone_destructor); return (0); } static char *restropts[] = { RESTRICTED_MNTOPTS }; /* * This routine adds those options to the option string `buf' which are * forced by secpolicy_fs_mount. If the automatic "security" options * are set, the option string gets them added if they aren't already * there. We search the string with "strstr" and make sure that * the string we find is bracketed with MNTOPT<","|"\0"> * * This is one half of the option inheritence algorithm which * implements the "restrict" option. The other half is implemented * in automountd; it takes its cue from the options we add here. */ static int autofs_restrict_opts(struct vfs *vfsp, char *buf, size_t maxlen, size_t *curlen) { int i; char *p; size_t len = *curlen - 1; /* Unrestricted */ if (!vfs_optionisset(vfsp, restropts[0], NULL)) return (0); for (i = 0; i < sizeof (restropts)/sizeof (restropts[0]); i++) { size_t olen = strlen(restropts[i]); /* Add "restrict" always and the others insofar set */ if ((i == 0 || vfs_optionisset(vfsp, restropts[i], NULL)) && ((p = strstr(buf, restropts[i])) == NULL || !((p == buf || p[-1] == ',') && (p[olen] == '\0' || p[olen] == ',')))) { if (len + olen + 1 > maxlen) return (-1); if (*buf != '\0') buf[len++] = ','; (void) strcpy(&buf[len], restropts[i]); len += olen; } } *curlen = len + 1; return (0); } /* ARGSUSED */ static int auto_mount(vfs_t *vfsp, vnode_t *vp, struct mounta *uap, cred_t *cr) { int error; size_t len = 0; autofs_args args; fninfo_t *fnip = NULL; vnode_t *rootvp = NULL; fnnode_t *rootfnp = NULL; char *data = uap->dataptr; char datalen = uap->datalen; dev_t autofs_dev; char strbuff[MAXPATHLEN + 1]; vnode_t *kkvp; struct autofs_globals *fngp; zone_t *zone = curproc->p_zone; AUTOFS_DPRINT((4, "auto_mount: vfs %p vp %p\n", (void *)vfsp, (void *)vp)); if ((error = secpolicy_fs_mount(cr, vp, vfsp)) != 0) return (EPERM); if (zone == global_zone) { zone_t *mntzone; mntzone = zone_find_by_path(refstr_value(vfsp->vfs_mntpt)); ASSERT(mntzone != NULL); zone_rele(mntzone); if (mntzone != zone) { return (EBUSY); } } /* * Stop the mount from going any further if the zone is going away. */ if (zone_status_get(zone) >= ZONE_IS_SHUTTING_DOWN) return (EBUSY); /* * We need a lock to serialize this; minor_lock is as good as any. */ mutex_enter(&autofs_minor_lock); if ((fngp = zone_getspecific(autofs_key, zone)) == NULL) { fngp = autofs_zone_init(); (void) zone_setspecific(autofs_key, zone, fngp); } mutex_exit(&autofs_minor_lock); ASSERT(fngp != NULL); /* * Get arguments */ if (uap->flags & MS_SYSSPACE) { if (datalen != sizeof (args)) return (EINVAL); error = kcopy(data, &args, sizeof (args)); } else { if (get_udatamodel() == DATAMODEL_NATIVE) { if (datalen != sizeof (args)) return (EINVAL); error = copyin(data, &args, sizeof (args)); } else { struct autofs_args32 args32; if (datalen != sizeof (args32)) return (EINVAL); error = copyin(data, &args32, sizeof (args32)); args.addr.maxlen = args32.addr.maxlen; args.addr.len = args32.addr.len; args.addr.buf = (char *)(uintptr_t)args32.addr.buf; args.path = (char *)(uintptr_t)args32.path; args.opts = (char *)(uintptr_t)args32.opts; args.map = (char *)(uintptr_t)args32.map; args.subdir = (char *)(uintptr_t)args32.subdir; args.key = (char *)(uintptr_t)args32.key; args.mount_to = args32.mount_to; args.rpc_to = args32.rpc_to; args.direct = args32.direct; } } if (error) return (EFAULT); /* * For a remount, only update mount information * i.e. default mount options, map name, etc. */ if (uap->flags & MS_REMOUNT) { fnip = vfstofni(vfsp); if (fnip == NULL) return (EINVAL); if (args.direct == 1) fnip->fi_flags |= MF_DIRECT; else fnip->fi_flags &= ~MF_DIRECT; fnip->fi_mount_to = args.mount_to; fnip->fi_rpc_to = args.rpc_to; /* * Get default options */ if (uap->flags & MS_SYSSPACE) error = copystr(args.opts, strbuff, sizeof (strbuff), &len); else error = copyinstr(args.opts, strbuff, sizeof (strbuff), &len); if (error) return (EFAULT); if (autofs_restrict_opts(vfsp, strbuff, sizeof (strbuff), &len) != 0) { return (EFAULT); } kmem_free(fnip->fi_opts, fnip->fi_optslen); fnip->fi_opts = kmem_alloc(len, KM_SLEEP); fnip->fi_optslen = (int)len; bcopy(strbuff, fnip->fi_opts, len); /* * Get context/map name */ if (uap->flags & MS_SYSSPACE) error = copystr(args.map, strbuff, sizeof (strbuff), &len); else error = copyinstr(args.map, strbuff, sizeof (strbuff), &len); if (error) return (EFAULT); kmem_free(fnip->fi_map, fnip->fi_maplen); fnip->fi_map = kmem_alloc(len, KM_SLEEP); fnip->fi_maplen = (int)len; bcopy(strbuff, fnip->fi_map, len); return (0); } /* * Allocate fninfo struct and attach it to vfs */ fnip = kmem_zalloc(sizeof (*fnip), KM_SLEEP); fnip->fi_mountvfs = vfsp; fnip->fi_mount_to = args.mount_to; fnip->fi_rpc_to = args.rpc_to; fnip->fi_refcnt = 0; vfsp->vfs_bsize = AUTOFS_BLOCKSIZE; vfsp->vfs_fstype = autofs_fstype; /* * Assign a unique device id to the mount */ mutex_enter(&autofs_minor_lock); do { autofs_minor = (autofs_minor + 1) & L_MAXMIN32; autofs_dev = makedevice(autofs_major, autofs_minor); } while (vfs_devismounted(autofs_dev)); mutex_exit(&autofs_minor_lock); vfsp->vfs_dev = autofs_dev; vfs_make_fsid(&vfsp->vfs_fsid, autofs_dev, autofs_fstype); vfsp->vfs_data = (void *)fnip; vfsp->vfs_bcount = 0; /* * Get daemon address */ fnip->fi_addr.len = args.addr.len; fnip->fi_addr.maxlen = fnip->fi_addr.len; fnip->fi_addr.buf = kmem_alloc(args.addr.len, KM_SLEEP); if (uap->flags & MS_SYSSPACE) error = kcopy(args.addr.buf, fnip->fi_addr.buf, args.addr.len); else error = copyin(args.addr.buf, fnip->fi_addr.buf, args.addr.len); if (error) { error = EFAULT; goto errout; } fnip->fi_zoneid = getzoneid(); /* * Get path for mountpoint */ if (uap->flags & MS_SYSSPACE) error = copystr(args.path, strbuff, sizeof (strbuff), &len); else error = copyinstr(args.path, strbuff, sizeof (strbuff), &len); if (error) { error = EFAULT; goto errout; } fnip->fi_path = kmem_alloc(len, KM_SLEEP); fnip->fi_pathlen = (int)len; bcopy(strbuff, fnip->fi_path, len); /* * Get default options */ if (uap->flags & MS_SYSSPACE) error = copystr(args.opts, strbuff, sizeof (strbuff), &len); else error = copyinstr(args.opts, strbuff, sizeof (strbuff), &len); if (error != 0 || autofs_restrict_opts(vfsp, strbuff, sizeof (strbuff), &len) != 0) { error = EFAULT; goto errout; } fnip->fi_opts = kmem_alloc(len, KM_SLEEP); fnip->fi_optslen = (int)len; bcopy(strbuff, fnip->fi_opts, len); /* * Get context/map name */ if (uap->flags & MS_SYSSPACE) error = copystr(args.map, strbuff, sizeof (strbuff), &len); else error = copyinstr(args.map, strbuff, sizeof (strbuff), &len); if (error) { error = EFAULT; goto errout; } fnip->fi_map = kmem_alloc(len, KM_SLEEP); fnip->fi_maplen = (int)len; bcopy(strbuff, fnip->fi_map, len); /* * Get subdirectory within map */ if (uap->flags & MS_SYSSPACE) error = copystr(args.subdir, strbuff, sizeof (strbuff), &len); else error = copyinstr(args.subdir, strbuff, sizeof (strbuff), &len); if (error) { error = EFAULT; goto errout; } fnip->fi_subdir = kmem_alloc(len, KM_SLEEP); fnip->fi_subdirlen = (int)len; bcopy(strbuff, fnip->fi_subdir, len); /* * Get the key */ if (uap->flags & MS_SYSSPACE) error = copystr(args.key, strbuff, sizeof (strbuff), &len); else error = copyinstr(args.key, strbuff, sizeof (strbuff), &len); if (error) { error = EFAULT; goto errout; } fnip->fi_key = kmem_alloc(len, KM_SLEEP); fnip->fi_keylen = (int)len; bcopy(strbuff, fnip->fi_key, len); /* * Is this a direct mount? */ if (args.direct == 1) fnip->fi_flags |= MF_DIRECT; /* * Setup netconfig. * Can I pass in knconf as mount argument? what * happens when the daemon gets restarted? */ if ((error = lookupname("/dev/ticotsord", UIO_SYSSPACE, FOLLOW, NULLVPP, &kkvp)) != 0) { cmn_err(CE_WARN, "autofs: lookupname: %d", error); goto errout; } fnip->fi_knconf.knc_rdev = kkvp->v_rdev; fnip->fi_knconf.knc_protofmly = NC_LOOPBACK; fnip->fi_knconf.knc_semantics = NC_TPI_COTS_ORD; VN_RELE(kkvp); /* * Make the root vnode */ rootfnp = auto_makefnnode(VDIR, vfsp, fnip->fi_path, cr, fngp); if (rootfnp == NULL) { error = ENOMEM; goto errout; } rootvp = fntovn(rootfnp); rootvp->v_flag |= VROOT; rootfnp->fn_mode = AUTOFS_MODE; rootfnp->fn_parent = rootfnp; /* account for ".." entry */ rootfnp->fn_linkcnt = rootfnp->fn_size = 1; fnip->fi_rootvp = rootvp; /* * Add to list of top level AUTOFS' if it is being mounted by * a user level process. */ if (!(uap->flags & MS_SYSSPACE)) { rw_enter(&fngp->fng_rootfnnodep->fn_rwlock, RW_WRITER); rootfnp->fn_parent = fngp->fng_rootfnnodep; rootfnp->fn_next = fngp->fng_rootfnnodep->fn_dirents; fngp->fng_rootfnnodep->fn_dirents = rootfnp; rw_exit(&fngp->fng_rootfnnodep->fn_rwlock); } AUTOFS_DPRINT((5, "auto_mount: vfs %p root %p fnip %p return %d\n", (void *)vfsp, (void *)rootvp, (void *)fnip, error)); return (0); errout: ASSERT(fnip != NULL); ASSERT((uap->flags & MS_REMOUNT) == 0); if (fnip->fi_addr.buf != NULL) kmem_free(fnip->fi_addr.buf, fnip->fi_addr.len); if (fnip->fi_path != NULL) kmem_free(fnip->fi_path, fnip->fi_pathlen); if (fnip->fi_opts != NULL) kmem_free(fnip->fi_opts, fnip->fi_optslen); if (fnip->fi_map != NULL) kmem_free(fnip->fi_map, fnip->fi_maplen); if (fnip->fi_subdir != NULL) kmem_free(fnip->fi_subdir, fnip->fi_subdirlen); if (fnip->fi_key != NULL) kmem_free(fnip->fi_key, fnip->fi_keylen); kmem_free(fnip, sizeof (*fnip)); AUTOFS_DPRINT((5, "auto_mount: vfs %p root %p fnip %p return %d\n", (void *)vfsp, (void *)rootvp, (void *)fnip, error)); return (error); } /* ARGSUSED */ static int auto_unmount(vfs_t *vfsp, int flag, cred_t *cr) { fninfo_t *fnip; vnode_t *rvp; fnnode_t *rfnp, *fnp, *pfnp; fnnode_t *myrootfnnodep; fnip = vfstofni(vfsp); AUTOFS_DPRINT((4, "auto_unmount vfsp %p fnip %p\n", (void *)vfsp, (void *)fnip)); if (secpolicy_fs_unmount(cr, vfsp) != 0) return (EPERM); /* * forced unmount is not supported by this file system * and thus, ENOTSUP, is being returned. */ if (flag & MS_FORCE) return (ENOTSUP); ASSERT(vn_vfswlock_held(vfsp->vfs_vnodecovered)); rvp = fnip->fi_rootvp; rfnp = vntofn(rvp); if (rvp->v_count > 1 || rfnp->fn_dirents != NULL) return (EBUSY); /* * The root vnode is on the linked list of root fnnodes only if * this was not a trigger node. Since we have no way of knowing, * if we don't find it, then we assume it was a trigger node. */ myrootfnnodep = rfnp->fn_globals->fng_rootfnnodep; pfnp = NULL; rw_enter(&myrootfnnodep->fn_rwlock, RW_WRITER); fnp = myrootfnnodep->fn_dirents; while (fnp != NULL) { if (fnp == rfnp) { /* * A check here is made to see if rvp is busy. If * so, return EBUSY. Otherwise proceed with * disconnecting it from the list. */ if (rvp->v_count > 1 || rfnp->fn_dirents != NULL) { rw_exit(&myrootfnnodep->fn_rwlock); return (EBUSY); } if (pfnp) pfnp->fn_next = fnp->fn_next; else myrootfnnodep->fn_dirents = fnp->fn_next; fnp->fn_next = NULL; break; } pfnp = fnp; fnp = fnp->fn_next; } rw_exit(&myrootfnnodep->fn_rwlock); ASSERT(rvp->v_count == 1); ASSERT(rfnp->fn_size == 1); ASSERT(rfnp->fn_linkcnt == 1); /* * The following drops linkcnt to 0, therefore the disconnect is * not attempted when auto_inactive() is called by * vn_rele(). This is necessary because we have nothing to get * disconnected from since we're the root of the filesystem. As a * side effect the node is not freed, therefore I should free the * node here. * * XXX - I really need to think of a better way of doing this. */ rfnp->fn_size--; rfnp->fn_linkcnt--; /* * release of last reference causes node * to be freed */ VN_RELE(rvp); rfnp->fn_parent = NULL; auto_freefnnode(rfnp); kmem_free(fnip->fi_addr.buf, fnip->fi_addr.len); kmem_free(fnip->fi_path, fnip->fi_pathlen); kmem_free(fnip->fi_map, fnip->fi_maplen); kmem_free(fnip->fi_subdir, fnip->fi_subdirlen); kmem_free(fnip->fi_key, fnip->fi_keylen); kmem_free(fnip->fi_opts, fnip->fi_optslen); kmem_free(fnip, sizeof (*fnip)); AUTOFS_DPRINT((5, "auto_unmount: return=0\n")); return (0); } /* * find root of autofs */ static int auto_root(vfs_t *vfsp, vnode_t **vpp) { *vpp = (vnode_t *)vfstofni(vfsp)->fi_rootvp; VN_HOLD(*vpp); AUTOFS_DPRINT((5, "auto_root: vfs %p, *vpp %p\n", (void *)vfsp, (void *)*vpp)); return (0); } /* * Get file system statistics. */ static int auto_statvfs(vfs_t *vfsp, struct statvfs64 *sbp) { dev32_t d32; AUTOFS_DPRINT((4, "auto_statvfs %p\n", (void *)vfsp)); bzero(sbp, sizeof (*sbp)); sbp->f_bsize = vfsp->vfs_bsize; sbp->f_frsize = sbp->f_bsize; sbp->f_blocks = (fsblkcnt64_t)0; sbp->f_bfree = (fsblkcnt64_t)0; sbp->f_bavail = (fsblkcnt64_t)0; sbp->f_files = (fsfilcnt64_t)0; sbp->f_ffree = (fsfilcnt64_t)0; sbp->f_favail = (fsfilcnt64_t)0; (void) cmpldev(&d32, vfsp->vfs_dev); sbp->f_fsid = d32; (void) strcpy(sbp->f_basetype, vfssw[vfsp->vfs_fstype].vsw_name); sbp->f_flag = vf_to_stf(vfsp->vfs_flag); sbp->f_namemax = MAXNAMELEN; (void) strcpy(sbp->f_fstr, MNTTYPE_AUTOFS); return (0); }